FN Thomson Reuters Web of Science™ VR 1.0 PT J AU MALONE, JD PAPARELLO, S THORNTON, S MAPES, T HABERBERGER, R HYAMS, KC AF MALONE, JD PAPARELLO, S THORNTON, S MAPES, T HABERBERGER, R HYAMS, KC TI PARASITIC INFECTIONS IN TROOPS RETURNING FROM OPERATION-DESERT-STORM SO NEW ENGLAND JOURNAL OF MEDICINE LA English DT Letter ID TRAVELERS DIARRHEA C1 USN, MED RES UNIT 3, FPO AE 09835-0007, CAIRO, EGYPT. USN, MED RES INST, BETHESDA, MD 20852 USA. RP MALONE, JD (reprint author), NATL NAVAL MED CTR, BETHESDA, MD 20814 USA. NR 7 TC 11 Z9 11 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 NOV 14 PY 1991 VL 325 IS 20 BP 1448 EP 1449 PG 2 WC Medicine, General & Internal SC General & Internal Medicine GA GP524 UT WOS:A1991GP52400025 PM 1922262 ER PT J AU WEAVER, BD REEVES, ME SUMMERS, GP SOULEN, RJ OLSON, WL EDDY, MM JAMES, TW SMITH, EJ AF WEAVER, BD REEVES, ME SUMMERS, GP SOULEN, RJ OLSON, WL EDDY, MM JAMES, TW SMITH, EJ TI CRITICAL-CURRENT ENHANCEMENT IN PARTICLE-IRRADIATED CUPRATE SEMICONDUCTORS SO APPLIED PHYSICS LETTERS LA English DT Article ID CRITICAL CURRENT-DENSITY; THIN-FILMS; SINGLE-CRYSTAL; YBA2CU3O7-DELTA; TEMPERATURE; CREEP AB Detailed measurements have been made of the magnetic field (0 < H < 6 T) and temperature (10 K < T < 100 K) dependencies of the critical current density j(c) in Tl2CaBa2Cu2O8 films before and after irradiation with incremental fluences (0 < PHI < 3 X 10(16) cm-2) of 2 MeV protons. The results are interpreted quantitatively in terms of radiation-induced changes in (1) the critical temperature, (2) the rate of thermal flux creep, and (3) local scale superconductivity. Radiation-induced enhancements in j(c) are described by an expression which allows the fluence that maximizes j(c) to be predicted as a function of H, T, pinning energy, and particle type. C1 SUPERCONDUCTOR TECHNOL INC,SANTA BARBARA,CA 93111. RP WEAVER, BD (reprint author), USN,RES LAB,CODE 4615,WASHINGTON,DC 20375, USA. NR 17 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 0003-6951 J9 APPL PHYS LETT JI Appl. Phys. Lett. PD NOV 11 PY 1991 VL 59 IS 20 BP 2600 EP 2602 DI 10.1063/1.105915 PG 3 WC Physics, Applied SC Physics GA GP275 UT WOS:A1991GP27500041 ER PT J AU HATHAWAY, K CULLEN, J AF HATHAWAY, K CULLEN, J TI MAGNETIC AND MAGNETOVOLUME PROPERTIES OF RCO2 COMPOUNDS AND ALLOYS FROM ENERGY-BAND STRUCTURE SO JOURNAL OF PHYSICS-CONDENSED MATTER LA English DT Article ID FE; NI AB A quantitative description of the magnetic behaviour is obtained for the itinerant electrons of the rare-earth-cobalt Laves-phase compounds. This is accomplished by fitting the results of a fixed-spin-moment calculation of the electronic energy of YCo2 to a power series in the magnetization for several different volumes and by coupling to the rare earth spins in molecular field theory. The T = 0 itinerant moments are obtained for the RCo2 series and the alloy Y1-xGdxCo2. The spontaneous volume magnetostriction of RCo2 is also estimated. The results are compared with experiment. RP HATHAWAY, K (reprint author), USN,CTR SURFACE WEAP,SILVER SPRING,MD 20903, USA. NR 16 TC 17 Z9 17 U1 0 U2 1 PU IOP PUBLISHING LTD PI BRISTOL PA TECHNO HOUSE, REDCLIFFE WAY, BRISTOL, ENGLAND BS1 6NX SN 0953-8984 J9 J PHYS-CONDENS MAT JI J. Phys.-Condes. Matter PD NOV 11 PY 1991 VL 3 IS 45 BP 8911 EP 8916 DI 10.1088/0953-8984/3/45/013 PG 6 WC Physics, Condensed Matter SC Physics GA GQ353 UT WOS:A1991GQ35300013 ER PT J AU HARRIS, MJ SHARE, GH AF HARRIS, MJ SHARE, GH TI A SEARCH FOR THE 2.223 MEV NEUTRON-CAPTURE GAMMA-RAY LINE FROM THE DIRECTIONS OF CYGNUS AND THE GALACTIC-CENTER SO ASTROPHYSICAL JOURNAL LA English DT Article DE GAMMA-RAYS, GENERAL; GALAXIES, NUCLEI; GALAXIES, THE GALAXY; X-RAYS, BINARIES ID THERMONUCLEAR BREAKUP REACTIONS; ANNIHILATION RADIATION; CENTER REGION; LIGHT-NUCLEI; SPECTRUM AB Free neutrons produced by nuclear reactions in high-temperature plasmas may undergo proton capture in ambient material, giving rise to gamma-ray emission in a line at 2.223 MeV. Plausible settings for this process include accretion disks around black holes, material accreting onto neutron stars, and the binary companions of TeV gamma-ray sources. Data accumulated by the Solar Maximum Mission Gamma Ray Spectrometer (GRS) between 1980 and 1989 have been searched for evidence of this line, during periods when the black hole candidates Cygnus X-1 and the Galactic center were in transit across the GRS aperture. During these periods the neutron-star X-ray binaries Cygnus X-3 and Scorpius X-1 were also in the respective GRS fields of view. A 3-sigma upper limit of 1.0 x 10(-4)-gamma (cm2 s)-1 has been placed on the steady emission in the 2.223 MeV line from the Galactic center and Scorpius X-1. Upper limits in the range 1.2-2.2 x 10(-4)-gamma (cm2 s)-1 have been set for Cygnus X-1 according to different models of the origin of the emission. The 3-sigma upper limit to the phase-averaged steady emission from Cygnus X-3 was found to be 1.2 x 10(-4)-gamma (cm2 s)-1. C1 SM SYST & RES CORP,LANDOVER,MD 20785. USN,RES LAB,EO HULBURT CTR SPACE RES,WASHINGTON,DC 20375. NR 29 TC 11 Z9 11 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 NOV 10 PY 1991 VL 381 IS 2 BP 439 EP 443 DI 10.1086/170666 PN 1 PG 5 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA GN112 UT WOS:A1991GN11200009 ER PT J AU MARISKA, JT ZARRO, DM AF MARISKA, JT ZARRO, DM TI SOFT-X-RAY EMISSION FROM ELECTRON-BEAM HEATED SOLAR-FLARES SO ASTROPHYSICAL JOURNAL LA English DT Article DE SUN, FLARES; SUN, X-RAYS ID LOOP RADIATIVE HYDRODYNAMICS; NONTHERMAL ELECTRONS; MAXIMUM MISSION; CHROMOSPHERE; DYNAMICS AB Using time-dependent numerical simulations and Solar Maximum Mission (SMM) observations of a solar flare on 1985 January 23, we examine the ability of an electron-beam-heating model to reproduce the rise phase of a flare as observed in soft X-ray lines of Ca XIX. The electron beam is parameterized by a peak flux, a low-energy cutoff, and a spectral index, and has a time dependence similar to the observed hard X-ray burst. We find that for a spectral index of 6, only models with a low-energy cutoff of 20 keV reproduce the observed peak emission in the Ca XIX line complex. All models with a low-energy cutoff of 15 keV produce too much emission, while all models with a 25 keV cutoff too little emission. None of the models reproduces the temporal behavior of the soft X-ray emission. We conclude that the electron-beam-heated component may only represent a small fraction of the energy released in the impulsive phase of this flare. C1 NASA, LYNDON B JOHNSON SPACE CTR, APPL RES CORP, HOUSTON, TX 77058 USA. RP USN, RES LAB, EO HULBURT CTR SPACE RES, CODE 4175, WASHINGTON, DC 20375 USA. NR 17 TC 15 Z9 15 U1 0 U2 0 PU IOP PUBLISHING LTD PI BRISTOL PA TEMPLE CIRCUS, TEMPLE WAY, BRISTOL BS1 6BE, ENGLAND SN 0004-637X EI 1538-4357 J9 ASTROPHYS J JI Astrophys. J. PD NOV 10 PY 1991 VL 381 IS 2 BP 572 EP 577 DI 10.1086/170681 PN 1 PG 6 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA GN112 UT WOS:A1991GN11200024 ER PT J AU DOSCHEK, GA DERE, KP LUND, PA AF DOSCHEK, GA DERE, KP LUND, PA TI RELATIVE ABUNDANCES IN THE LOWER SOLAR TRANSITION REGION SO ASTROPHYSICAL JOURNAL LA English DT Article DE GALAXIES, ABUNDANCES; SUN, SUNSPOTS; SUN, TRANSITION REGION; ULTRAVIOLET, SPECTRA ID UNRESOLVED FINE-STRUCTURES; HIGH-RESOLUTION TELESCOPE; TEMPERATURE REGION; QUIET SUN; ATMOSPHERE; CHROMOSPHERE; SUNSPOT; SPECTRUM; CORONA; ZONE AB We investigate properties of the lower solar transition region as determined from UV spectral lines recorded by the Naval Research Laboratory High Resolution Telescope and Spectrograph (HRTS). The spectra were obtained from a rocket flight in 1975 July. We discuss variations of intensity ratios of strong lines of C IV, Si IV, C II, Si III, and O IV over the entire field of view of the HRTS instrument, which extends from disk center to the solar limb. We find evidence for abundance variations in the lower transition region, similar in magnitude to the variations reported by Feldman, Widing, and Lund, although it is not possible to state with absolute certainty that the line intensity variations are not due to emission measure effects. The largest apparent abundance variations appear to be in the active regions surrounding a sunspot. The C/Si ratio is lower in the active regions than anywhere else in the instrument field of view, implying a lower C/Si abundance ratio in the active regions. There is a possible correlation of line intensity variation in the active region with Doppler shift of the lines; the explanation for this is unclear. We also discuss the magnitude and reality of intensity ratio variations of all observed solar features, and measure monotonic center-to-limb intensity ratio variations due to the opacity of some of the spectral lines. RP DOSCHEK, GA (reprint author), USN,RES LAB,EO HULBURT CTR SPACE RES,WASHINGTON,DC 20375, USA. NR 24 TC 21 Z9 21 U1 0 U2 0 PU UNIV CHICAGO PRESS PI CHICAGO PA 5720 S WOODLAWN AVE, CHICAGO, IL 60637 SN 0004-637X J9 ASTROPHYS J JI Astrophys. J. PD NOV 10 PY 1991 VL 381 IS 2 BP 583 EP 590 DI 10.1086/170683 PN 1 PG 8 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA GN112 UT WOS:A1991GN11200026 ER PT J AU NAVARRO, R LERA, F BADIA, A RILLO, C BARTOLOME, J LECHTER, WL TOTH, LE AF NAVARRO, R LERA, F BADIA, A RILLO, C BARTOLOME, J LECHTER, WL TOTH, LE TI CRITICAL CURRENT MODEL ANALYSIS OF INTERGRAIN AND INTRAGRAIN EFFECTS IN A HIGH-DENSITY SINTERED TL-BA-CA-CU-O CERAMIC SO PHYSICA C LA English DT Article ID HIGH-TEMPERATURE SUPERCONDUCTORS; HIGH-TC SUPERCONDUCTORS; FIELD DIAMAGNETIC PROPERTIES; CRITICAL-STATE MODEL; IRREVERSIBLE MAGNETIZATION; HARMONIC-GENERATION; YBA2CU3O7-DELTA; TL2CA2BA2CU3O10 AB Isothermal DC magnetization in fields up to 5 T and harmonic component (AC fields of 1.1 mT) data for a sintered Tl2Ba2Ca2Cu3Ox powder sample are reported. The sample contains mainly the 2223 phase, with a diamagnetic onset at 115 +/- 1 K. The initial magnetization curves at various temperatures scale to a single curve. This behavior and the results of the harmonic analysis agree with general predictions derived from critical state current models. C1 USN,RES LAB,WASHINGTON,DC 20375. RP NAVARRO, R (reprint author), UNIV ZARAGOZA,CSIC,INST CIENCIA MAT ARAGON,E-50009 ZARAGOZA,SPAIN. RI Bartolome Sanjoaquin, Juan/G-2715-2014; Lera, Francisco/H-4526-2015; Rillo, Conrado/H-4841-2015; OI Bartolome Sanjoaquin, Juan/0000-0002-6517-1236; Lera, Francisco/0000-0002-1568-1481; Rillo, Conrado/0000-0002-5710-5562; /0000-0002-8753-2397 NR 27 TC 7 Z9 7 U1 0 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0921-4534 J9 PHYSICA C JI Physica C PD NOV 10 PY 1991 VL 183 IS 1-3 BP 73 EP 82 DI 10.1016/0921-4534(91)90768-T PG 10 WC Physics, Applied SC Physics GA GT360 UT WOS:A1991GT36000011 ER PT J AU CZIPOTT, PV LEVINE, MD PAULSON, CA MENEMENLIS, D FARMER, DM WILLIAMS, RG AF CZIPOTT, PV LEVINE, MD PAULSON, CA MENEMENLIS, D FARMER, DM WILLIAMS, RG TI ICE FLEXURE FORCED BY INTERNAL WAVE-PACKETS IN THE ARCTIC-OCEAN SO SCIENCE LA English DT Article AB Tiltmeters on the Arctic Ocean were used to measure flexure of the ice forced by an energetic packet of internal waves riding the crest of diurnal internal bores emanating from the Yermak Plateau, north of the Svalbard Archipelago. The waves forced an oscillatory excursion of 36 microradians in tilt of the ice, corresponding to an excursion of 16 micrometers per second in vertical velocity at the surface and of 3.5 millimeters in surface displacement. Strainmeters embedded in the ice measured an excursion of 3 x 10(-7) in strain, consistent with ice flexure rather than compression. The measured tilt is consistent with direct measurements of excursions in horizontal current near the surface (12 centimeters per second) and in vertical displacement (36 meters) of the pycnocline 100 meters below the surface. C1 FISHERIES & OCEANS CANADA INST OCEAN SCI, SIDNEY V8L 4B2, BC, CANADA. OREGON STATE UNIV, COLL OCEANOG, CORVALLIS, OR 97331 USA. USN ACAD, DEPT OCEANOG, ANNAPOLIS, MD 21402 USA. RP SQM TECHNOL INC, POB 2225, LA JOLLA, CA 92038 USA. NR 21 TC 13 Z9 13 U1 1 U2 4 PU AMER ASSOC ADVANCEMENT SCIENCE PI WASHINGTON PA 1200 NEW YORK AVE, NW, WASHINGTON, DC 20005 USA SN 0036-8075 EI 1095-9203 J9 SCIENCE JI Science PD NOV 8 PY 1991 VL 254 IS 5033 BP 832 EP 835 DI 10.1126/science.254.5033.832 PG 4 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA GN833 UT WOS:A1991GN83300037 PM 17787172 ER PT J AU ERWIN, SC PICKETT, WE AF ERWIN, SC PICKETT, WE TI THEORETICAL FERMI-SURFACE PROPERTIES AND SUPERCONDUCTING PARAMETERS FOR K3C60 SO SCIENCE LA English DT Article AB Quantitative theories of superconductivity in alkali-doped C60 require an accurate and detailed description of the Fermi surface. First-principles calculations of Fermi-surface properties and electronic parameters for K3C60, the prototype fulleride-superconductor, are reported. The Fermi surface has two sheets; the first is free-electron-like, and the second is multiply-connected, forming two interlocked symmetry-equivalent pieces that never touch. The calculated (clean limit) London penetration depth is LAMBDA = 1600 angstrom. Comparing the Fermi velocity with the experimental coherence length leads to a superconducting pairing strength lambda approximately 5, indicating very strong coupling. Partial nesting in the second Fermi-surface sheet may favor coupling to short-wavelength optic modes. 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 211 Z9 212 U1 2 U2 16 PU AMER ASSOC ADVANCEMENT SCIENCE PI WASHINGTON PA 1200 NEW YORK AVE, NW, WASHINGTON, DC 20005 SN 0036-8075 J9 SCIENCE JI Science PD NOV 8 PY 1991 VL 254 IS 5033 BP 842 EP 845 DI 10.1126/science.254.5033.842 PG 4 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA GN833 UT WOS:A1991GN83300040 PM 17787174 ER PT J AU SNOW, AW SPRAGUE, LG SOULEN, RL GRATE, JW WOHLTJEN, H AF SNOW, AW SPRAGUE, LG SOULEN, RL GRATE, JW WOHLTJEN, H TI SYNTHESIS AND EVALUATION OF HEXAFLUORODIMETHYLCARBINOL FUNCTIONALIZED POLYMERS AS MICROSENSOR COATINGS SO JOURNAL OF APPLIED POLYMER SCIENCE LA English DT Article ID VAPOR; SENSOR; RESPONSES AB Polystyrenes, polyacrylates, and poly (3,4-isoprenes) incorporating the hexafluorodimethylcarbinol functionality have been synthesized, characterized, and tested as microsensor coatings on a surface acoustic wave (SAW) device for dimethyl methylphosphonate (DMMP) vapor absorption sensitivity. The syntheses involved monomer functionalization and polymerization or hexafluoroacetone reaction with preformed polymer. All fluoroalcohol functionalized polymer coatings displayed sub parts per million level sensitivity with the slope of the absorption isotherm steepest at low DMMP concentrations. The order of sensitivity for the isomeric polystyrene fluoroalcohols (meta > para >> ortho) paralleled that of the relative free hydroxyl to hydrogen-bonded hydroxyl content. Strong hydrogen bonding between the fluoroalcohol polymers and DMMP vapor was observed by IR spectroscopy. Acylation of the fluoroalcohol group markedly reduced the DMMP sensitivity. C1 MICROSENSOR SYST INC,SPRINGFIELD,VA 22151. RP SNOW, AW (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 28 TC 48 Z9 50 U1 2 U2 5 PU JOHN WILEY & SONS INC PI NEW YORK PA 605 THIRD AVE, NEW YORK, NY 10158-0012 SN 0021-8995 J9 J APPL POLYM SCI JI J. Appl. Polym. Sci. PD NOV 5 PY 1991 VL 43 IS 9 BP 1659 EP 1671 DI 10.1002/app.1991.070430909 PG 13 WC Polymer Science SC Polymer Science GA GL520 UT WOS:A1991GL52000009 ER PT J AU DRUMMOND, JC BRANN, CA PERKINS, DE WOLFE, DE AF DRUMMOND, JC BRANN, CA PERKINS, DE WOLFE, DE TI A COMPARISON OF MEDIAN FREQUENCY, SPECTRAL EDGE FREQUENCY, A FREQUENCY BAND POWER RATIO, TOTAL POWER, AND DOMINANCE SHIFT IN THE DETERMINATION OF DEPTH OF ANESTHESIA SO ACTA ANAESTHESIOLOGICA SCANDINAVICA LA English DT Article DE ANESTHESIA, DEPTH; ELECTROENCEPHALOGRAM; ELECTROENCEPHALOGRAM (EEG), PROCESSED ID EEG; ISOFLURANE; CORRELATE; FENTANYL AB Five numerical descriptors were derived from the electroencephalogram (EEG), recorded, and processed (Tracor Nomad(R)) during emergence from isoflurane-nitrous oxide anesthesia. The five descriptors (median frequency, spectral edge frequency-90%, total power, a frequency band power ratio, and the ratio of frontal to occipital power) were compared for their ability to predict imminent arousal. Arousal was defined as spontaneous movement, coughing or eye opening. All of the descriptors except the frontal-occipital power ratio underwent significant (P < 0.05) changes between the initial recordings made intraoperatively during surgical stimulus under anesthesia and later recordings in the 40 s preceding arousal. A post hoc analysis was performed to identify the threshold value for each parameter that best served to predict imminent arousal. For median frequency, spectral edge frequency-90%, total power, and the frequency band power ratio, thresholds that predicted imminent arousal with sensitivities of 90% and specificities of 82-90% could be identified. The data indicate that, even in the favorable circumstances of the present study (uniform anesthetic technique, post hoc identification of thresholds), none of several previously popularized EEG descriptors (median frequency, spectral edge frequency-90%, total power, a frequency band power ratio) can serve as a completely reliable sole predictor of imminent arousal. As presently derived, these EEG descriptors at best provide trend information to be used in concert with other clinical signs of depth of anesthesia. C1 VET ADM MED CTR,DEPT ANESTHESIA,SAN DIEGO,CA 92161. WILFORD HALL USAF MED CTR,DEPT ANESTHESIA,SAN ANTONIO,TX. USN HOSP,DEPT ANESTHESIA,SAN DIEGO,CA 92134. USN HOSP,DEPT ANESTHESIA,PENSACOLA,FL. RP DRUMMOND, JC (reprint author), UNIV CALIF SAN DIEGO,DEPT ANESTHESIA,LA JOLLA,CA 92093, USA. NR 11 TC 102 Z9 104 U1 0 U2 4 PU MUNKSGAARD INT PUBL LTD PI COPENHAGEN PA 35 NORRE SOGADE, PO BOX 2148, DK-1016 COPENHAGEN, DENMARK SN 0001-5172 J9 ACTA ANAESTH SCAND JI Acta Anaesthesiol. Scand. PD NOV PY 1991 VL 35 IS 8 BP 693 EP 699 PG 7 WC Anesthesiology SC Anesthesiology GA GT915 UT WOS:A1991GT91500002 PM 1763588 ER PT J AU RANDALL, DA PARKER, GS KENNEDY, KS AF RANDALL, DA PARKER, GS KENNEDY, KS TI INDICATIONS FOR TONSILLECTOMY AND ADENOIDECTOMY SO AMERICAN FAMILY PHYSICIAN LA English DT Article AB Tonsillectomy and adenoidectomy are separate procedures that should be performed for distinct reasons. Studies now indicate that severe, recurrent pharyngitis responds well to tonsillectomy. According to separate recommendations from the American Medical Association and the American Academy of Pediatrics, patients are candidates for tonsillectomy if they have four or more episodes of pharyngitis a year. Recurrent otitis media and chronic otitis media are improved by adenoidectomy, although placement of pressure-equalizing tubes remains the preferred initial treatment for these conditions. Adenotonsillectomy improves severe upper airway obstruction (cor pulmonale and obstructive sleep apnea), as well as milder forms of airway obstruction (loud snoring). The effectiveness of these procedures in proposed indications, such as sinusitis and adenoiditis, is less well substantiated. RP RANDALL, DA (reprint author), USN HOSP,SAN DIEGO,CA 92134, USA. NR 0 TC 5 Z9 5 U1 0 U2 0 PU AMER ACAD FAMILY PHYSICIANS PI KANSAS CITY PA 8880 WARD PARKWAY, KANSAS CITY, MO 64114-2797 SN 0002-838X J9 AM FAM PHYSICIAN JI Am. Fam. Physician PD NOV PY 1991 VL 44 IS 5 BP 1639 EP 1646 PG 8 WC Primary Health Care; Medicine, General & Internal SC General & Internal Medicine GA GQ618 UT WOS:A1991GQ61800012 PM 1950961 ER PT J AU WOOD, DP COWAN, ML AF WOOD, DP COWAN, ML TI CRISIS-INTERVENTION FOLLOWING DISASTERS - ARE WE DOING ENOUGH - (A 2ND LOOK) SO AMERICAN JOURNAL OF EMERGENCY MEDICINE LA English DT Article DE DISASTER; MASS CASUALTIES; PSYCHOLOGICAL TRAUMA; PSYCHOLOGICAL INTERVENTION; COMBAT PSYCHIATRY; NATIONAL DISASTER MEDICAL SYSTEM; DISASTER MEDICAL ASSISTANCE TEAM C1 NAVAL HOSP,BEAUFORT,SC. NR 0 TC 11 Z9 11 U1 1 U2 4 PU W B SAUNDERS CO PI PHILADELPHIA PA INDEPENDENCE SQUARE WEST CURTIS CENTER, STE 300, PHILADELPHIA, PA 19106-3399 SN 0735-6757 J9 AM J EMERG MED JI Am. J. Emerg. Med. PD NOV PY 1991 VL 9 IS 6 BP 598 EP 602 DI 10.1016/0735-6757(91)90122-Z PG 5 WC Emergency Medicine SC Emergency Medicine GA GM672 UT WOS:A1991GM67200018 PM 1930406 ER PT J AU LIEBERTHAL, W MCGARRY, AE SHEILS, J VALERI, CR AF LIEBERTHAL, W MCGARRY, AE SHEILS, J VALERI, CR TI NITRIC-OXIDE INHIBITION IN RATS IMPROVES BLOOD-PRESSURE AND RENAL-FUNCTION DURING HYPOVOLEMIC SHOCK SO AMERICAN JOURNAL OF PHYSIOLOGY LA English DT Article DE ENDOTHELIUM-DERIVED RELAXING FACTOR; N-G-MONOMETHYL-L-ARGI-NINE; HEMORRHAGIC HYPOTENSION; RENAL HEMODYNAMICS ID VASCULAR ENDOTHELIAL-CELLS; RELAXING FACTOR; RESPONSES; ARGININE AB We have examined the systemic and renal hemodynamic effects of nitric oxide (NO) inhibition with N(G)-monomethyl-L-arginine (L-NMMA) in normotensive rats as well as in rats with hypovolemic shock induced by hemorrhage. L-NMMA increased mean arterial blood pressure (MAP) from 114 +/- 4 to 130 +/- 6 mmHg (P < 0.05) in the nonhemorrhaged rats and from 61 +/- 3 to 89 +/- 3 mmHg (P < 0.05) in the hypovolemic animals. The absolute increase in MAP was greater in the hypovolemic (31 +/- 3 mmHg) than in the nonhemorrhaged (15 +/- 2 mmHg) rats (P < 0.05). An excess of L-arginine reversed the increase in MAP induced by L-NMMA in both groups. In the normotensive rats the increase in blood pressure was associated with an elevation in renal vascular resistance (RVR; from 6.5 +/- 0.7 to 8.2 +/- 0.9 mmHg.ml-1. min-1, P < 0.05) so that renal plasma flow (RPF) and glomerular filtration rate (GFR) were unchanged. In contrast, in the hypotensive rats, the marked increase in MAP induced by L-NMMA infusion was not associated with a significant increase in RVR. As a result L-NMMA increased both RPF (from 6.0 +/- 0.4 to 7.8 +/- 0.4 ml/min, P < 0.05) as well as GFR (from 1.7 +/- 0.2 to 2.5 +/- 0.2 ml/min, P < 0.05). We conclude that NO is produced and modulates peripheral resistance in normotensive rats as well as in rats with hypovolemic shock. In the hypovolemic rats NO inhibition substantially improves RPF and GFR. Thus NO production contributes to the hypotension and reduced renal function in hypovolemic rats by maintaining peripheral vasodilation. C1 BOSTON UNIV HOSP,DEPT MED,BOSTON,MA 02218. USN,BLOOD RES LAB,BOSTON,MA 02118. RP LIEBERTHAL, W (reprint author), BOSTON UNIV HOSP,EVANS MEM DEPT CLIN RES,RENAL SECT,88 E NEWTON ST,BOSTON,MA 02218, USA. FU NIDDK NIH HHS [DK-375105-04] NR 18 TC 55 Z9 55 U1 0 U2 0 PU AMER PHYSIOLOGICAL SOC PI BETHESDA PA 9650 ROCKVILLE PIKE, BETHESDA, MD 20814 SN 0002-9513 J9 AM J PHYSIOL JI Am. J. Physiol. PD NOV PY 1991 VL 261 IS 5 BP F868 EP F872 PN 2 PG 5 WC Physiology SC Physiology GA GQ781 UT WOS:A1991GQ78100099 PM 1951718 ER PT J AU KARLE, JM KARLE, IL AF KARLE, JM KARLE, IL TI CRYSTAL-STRUCTURE AND MOLECULAR-STRUCTURE OF MEFLOQUINE METHYLSULFONATE MONOHYDRATE - IMPLICATIONS FOR A MALARIA RECEPTOR SO ANTIMICROBIAL AGENTS AND CHEMOTHERAPY LA English DT Article ID PLASMODIUM-FALCIPARUM; RESISTANCE; QUINIDINE; THAILAND AB The crystal structure of (+/-)-mefloquine methylsulfonate monohydrate was determined by X-ray diffraction and was compared with the crystal structures of mefloquine hydrochloride and mefloquine free base. The conformation of mefloquine was essentially the same in all three crystalline environments and was not dependent on whether mefloquine was a salt or a free base. In mefloquine methylsulfonate monohydrate, the angle between the average plane of the quinoline ring and the average plane of the piperidine ring was 76.9-degrees. The intramolecular aliphatic N-13 . . . O-1 distance was 2.730 +/- 0.008 angstrom (1 angstrom = 0.1 nm), which is close to the aliphatic N . . . O distance found in the antimalarial cinchona alkaloids. The hydrogen bonds with two different hydrogen bond with the water molecule, and the amine group formed hydrogen bonds with two different methylsulfonate ions. The crystallographic parameters for (+/-)-mefloquine methylsufonate monohydrate were as follows: C17H17F6N2O+ . CH3SO3- . H2O; M(r) = 492.4; symmetry of unit cell, monoclinic; space group, P2(1)/a; parameters of unit cell, a was 8.678 +/- 0.001 angstrom, b was 28.330 +/- 0.003 angstrom, c was 8.804 +/- 0.001 angstrom, beta was 97.50 +/- 0.01-degrees; the volume of the unit cell was 2145.9 angstrom 3; the number of molecules per unit cell was 4; the calculated density was 1.52 g cm-3; the source of radiation was Cu K-alpha (lambda = 1.54178 angstrom); mu (absorption coefficient) was 20.46 cm-1; F(000) (sum of atomic scattering factors at zero scattering angle) was 1,016; room temperature was used; and the final R (residual index) was 6.58% for 1,740 reflections with \ F(o) \ > 3-sigma (F). Since the mechanism of antimalarial action and the mechanism of mefloquine resistance may involve hydrogen bond formation between mefloquine and a cellular effector or transport proteins, the common conformation of mefloquine found in each crystalline environment may define the orientation in which mefloquine forms these potentially critical hydrogen bonds with cellular constituents. C1 USN,RES LAB,STRUCT MATTER LAB,WASHINGTON,DC 20375. RP KARLE, JM (reprint author), WALTER REED ARMY MED CTR,DEPT PHARMACOL,DIV EXPTL THERAPEUT,WASHINGTON,DC 20307, USA. NR 27 TC 23 Z9 23 U1 0 U2 4 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 NOV PY 1991 VL 35 IS 11 BP 2238 EP 2245 PG 8 WC Microbiology; Pharmacology & Pharmacy SC Microbiology; Pharmacology & Pharmacy GA GM872 UT WOS:A1991GM87200013 PM 1803997 ER PT J AU FRIEDMAN, H AF FRIEDMAN, H TI BIG SCIENCE VS LITTLE SCIENCE - THE CONTROVERSY MOUNTS (REPRINTED FROM COSMOS - A JOURNAL OF EMERGING ISSUES) SO APPLIED OPTICS LA English DT Editorial Material AB The dilemma of our scientific time is reviewed by the chief scientist emeritus of the Space Science Program of the U.S. Naval Research Laboratory. It is reprinted here by permission from the first issue of Cosmos: a Journal of Emerging Issues. RP FRIEDMAN, H (reprint author), USN,RES LAB,SPACE SCI PROGRAM,WASHINGTON,DC 20375, USA. NR 1 TC 0 Z9 0 U1 0 U2 0 PU OPTICAL SOC AMER PI WASHINGTON PA 2010 MASSACHUSETTS AVE NW, WASHINGTON, DC 20036 SN 0003-6935 J9 APPL OPTICS JI Appl. Optics PD NOV 1 PY 1991 VL 30 IS 31 BP 4462 EP 4467 PG 6 WC Optics SC Optics GA GT889 UT WOS:A1991GT88900002 ER PT J AU MORTAZAVI, MA KNOESEN, A KOWEL, ST HENRY, RA HOOVER, JM LINDSAY, GA AF MORTAZAVI, MA KNOESEN, A KOWEL, ST HENRY, RA HOOVER, JM LINDSAY, GA TI 2ND-ORDER NONLINEAR OPTICAL-PROPERTIES OF POLED COUMAROMETHACRYLATE COPOLYMERS SO APPLIED PHYSICS B-PHOTOPHYSICS AND LASER CHEMISTRY LA English DT Article ID 2ND-HARMONIC GENERATION; POLYMER; FILMS AB Second-order nonlinear optical properties of newly designed and synthesized coumaromethacrylate side-chain polymers are reported. The optimum poling conditions were determined experimentally. The optimum poling temperature for these side-chain polymers is well above the glass transition temperature. The second harmonic coefficient of films poled by corona-onset at elevated temperature and the linear electro-optic coefficient of films poled by contact electrodes were measured. The stabilized value of the second harmonic coefficient, d33, at 1064 nm fundamental wavelength was found to be 13 pm/V. The linear electro-optic coefficient, r33, exhibits strong dispersion ranging from 2 to 12 pm/V in the wavelength range 477 to 1115 nm. C1 UNIV CALIF DAVIS,DEPT ELECT ENGN & COMP SCI,DAVIS,CA 95616. USN,CTR WEAP,RES DEPT,POLYMER SCI BRANCH,CHINA LAKE,CA 93555. NR 25 TC 43 Z9 43 U1 0 U2 1 PU SPRINGER VERLAG PI NEW YORK PA 175 FIFTH AVE, NEW YORK, NY 10010 SN 0721-7269 J9 APPL PHYS B-PHOTO PD NOV-DEC PY 1991 VL 53 IS 5-6 BP 287 EP 295 DI 10.1007/BF00331816 PG 9 WC Physics, Applied SC Physics GA GV789 UT WOS:A1991GV78900005 ER PT J AU WILSON, JF FREEMAN, SB BREENE, DP AF WILSON, JF FREEMAN, SB BREENE, DP TI ANTERIOR ISCHEMIC OPTIC NEUROPATHY CAUSING BLINDNESS IN THE HEAD AND NECK-SURGERY PATIENT SO ARCHIVES OF OTOLARYNGOLOGY-HEAD & NECK SURGERY LA English DT Article ID CARDIOPULMONARY BYPASS AB Anterior ischemic optic neuropathy is an uncommon and devastating event that can result in unilateral or bilateral blindness. It has been reported as a complication of ophthalmologic or general surgical and cardiothoracic procedures as well as a spontaneous event in severe systemic disease. Aggravating intraoperative factors include anemia, hemorrhage, hypotension, preexisting small-vessel disease, and increased intraocular pressure. We present a case of anterior ischemic optic neuropathy as a complication in a 48-year-old man undergoing extensive resection of recurrent carcinoma of the head and neck. Possible contributing risk factors in our patient include preexisting hypertension, intraoperative blood loss, previous radical neck dissection with venous compromise, intraoperative head and neck edema, and the use of tightly adherent plastic bubble-type intraoperative eye protection. The possible pathogenesis of this devastating complication and recommendations for prevention and management of anterior ischemic optic neuropathy are described. C1 USN HOSP,DEPT OPHTHALMOL,PORTSMOUTH,VA 23708. UNIFORMED SERV UNIV HLTH SCI,F EDWARD HEBERT SCH MED,DEPT SURG,BETHESDA,MD 20814. RP WILSON, JF (reprint author), USN HOSP,DEPT OTOLARYNGOL HEAD & NECK SURG,PORTSMOUTH,VA 23708, USA. NR 18 TC 27 Z9 27 U1 0 U2 0 PU AMER MEDICAL ASSOC PI CHICAGO PA 515 N STATE ST, CHICAGO, IL 60610 SN 0886-4470 J9 ARCH OTOLARYNGOL JI Arch. Otolaryngol. Head Neck Surg. PD NOV PY 1991 VL 117 IS 11 BP 1304 EP 1306 PG 3 WC Otorhinolaryngology; Surgery SC Otorhinolaryngology; Surgery GA GN853 UT WOS:A1991GN85300021 PM 1747239 ER PT J AU MCCARTHY, DD LUZUM, BJ AF MCCARTHY, DD LUZUM, BJ TI OBSERVATIONS OF LUNI-SOLAR AND FREE CORE NUTATION SO ASTRONOMICAL JOURNAL LA English DT Article ID NUMERICAL DETERMINATION; FORCED NUTATIONS; RIGID-EARTH; CONSTANTS AB An analysis of the differences between observed nutation angles and the 1980 IAU Nutation Theory shows the existence of currently unmodeled effects. An empirical set of corrections to the 1980 IAU Nutation Theory is presented and compared with current geophysical models. A retrograde periodic variation (period almost-equal-to 418 days), which may be related to the theoretical free core nutation, is seen. RP MCCARTHY, DD (reprint author), USN OBSERV,WASHINGTON,DC 20392, USA. NR 19 TC 18 Z9 19 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 NOV PY 1991 VL 102 IS 5 BP 1889 EP 1895 DI 10.1086/116011 PG 7 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA GL774 UT WOS:A1991GL77400030 ER PT J AU WILSON, TL JOHNSTON, KJ MAUERSBERGER, R AF WILSON, TL JOHNSTON, KJ MAUERSBERGER, R TI THE INTERNAL STRUCTURE OF MOLECULAR CLOUDS .2. THE W3(OH)/W3(H2O) REGION SO ASTRONOMY & ASTROPHYSICS LA English DT Article DE MASERS; H-II REGIONS; MOLECULAR CLOUDS; W3(OH); STAR FORMATION ID H-II REGIONS; HYDROGEN RECOMBINATION; DUST EMISSION; W3(OH); MASERS; LINES; OH; TRANSITIONS; CENTIMETER; DISCOVERY AB Very Large Array (VLA) 0".3 resolution maps of the 10(1) - 9(2) A- absorption line of methanol and the 2-pi-3/2, J = 9/2, F = 5 - 5 absorption line of OH toward the compact H 11 region W3(OH) are presented. These are combined with 12" - 26" resolution single dish maps of 8 molecular emission lines and an analysis of recombination line data to determine the distribution of H-2 and the dynamics of the H-2/H II complex, The methanol absorption is concentrated over approximately 1" (alpha) x 2" (delta) toward the western part of the 2" diameter H II region. The most intense maximum, toward the NW of W3(OH), shows a position shift with velocity in the NW-SE direction. This may indicate a gradient of approximately 400 km s-1 pc-1 in the sense of galactic rotation. There is no intense methanol emission from the 10(1) - 9(2)A- line. The 9(2) - 10(1) A+ methanol masers are offset from methanol absorption line maxima. The 2-pi-3/2 J = 9/2 OH absorption is distributed over a wider region than the methanol absorption. Our model for the radio recombination line data requires that the ionized gas consists of two regions with upsilon-LSR of -49.5 and -41.5 km s-1. The ionized gas with a more positive upsilon-LSR has a larger density and smaller mass: this may be in the west, closer to the OH masers. The mass of the ionized gas is less-than-or-equal-to 1.5 10(-2) M.; the mass-averaged radial velocity is -48.8 kms-1. The radial velocities of the ionized gas are consistent with a variant of champagne flow off massive neutral clouds. whose properties were studied using the J = 2 - 1 line of C18O and the J = 2 - 1 and 5 - 4 lines of CS and C34S, as well as other molecules. The radial velocity of this molecular gas toward W3(OH) is -46.6 kms-1; 7" east, toward W3(H2O), the radial velocity is -48 kms-1. These velocities are consistent with a gradient of approximately 15 km s-1 pc-1. From the data, we find that the emission observed toward W3(OH)/(H2O) arises from three compact molecular regions: 1) the methanol and OH maser cloudlet (M approximately 5 M., T(kin) approximately 100 to 160 K, n(H-2) approximately 10(7) cm-3) in front of the H II region (2) a more massive molecular region (M = 50 M.) behind or to the side of the H II region and (3) the molecular region (M approximately 70 M.) associated with the H2O maser complex. Regions (2) and (3) are found in mm wavelength lines; these are embedded in an extended molecular cloud of mass 2 10(3) M., density approximately 10(5) cm-3 and T(kin) approximately 20 K. From self-absorbed lines, this region is contracting at approximately 0.5 to 1.5 kms-1. Region (1) is falling toward Region (2), but this motion is slowed by the expansion of W3(OH). C1 IRAM, E-18012 GRANADA, SPAIN. USN, RES LAB, CTR ADV SPACE SENSING, WASHINGTON, DC 20375 USA. RP WILSON, TL (reprint author), MAX PLANCK INST RADIOASTRON, HUGEL 69, W-5300 BONN, GERMANY. NR 48 TC 38 Z9 38 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 NOV PY 1991 VL 251 IS 1 BP 220 EP 230 PG 11 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA GM776 UT WOS:A1991GM77600028 ER PT J AU WILSON, TL GAUME, R JOHNSTON, KJ AF WILSON, TL GAUME, R JOHNSTON, KJ TI HIGH-RESOLUTION OBSERVATIONS OF THE (9,8) AMMONIA MASER LINE IN W51-IRS2 SO ASTRONOMY & ASTROPHYSICS LA English DT Letter DE INTERSTELLAR MEDIUM, MOLECULES, HII REGIONS, MASERS ID W51; EMISSION; REGIONS; GALAXY AB The (J,K) = (9,8) masing transition of para-ammonia has been observed toward the star forming region W51-IRS2 with a spatial resolution of about 200 milli-arc seconds (mas). The maser is located 3" southwest of the well studied HII region W51D. The maser center is unresolved; an upper limit to the size is 120 mas. This corresponds to a peak brightness temperature of more than 3 10(5) K. A previously undetected continuum source, presumably ultra-compact HII region, is found 65 mas SE of the ammonia maser. This region has a peak flux density of 27 mJy, and a size of less that 100 mas. The (9,8) maser arises from energy levels which are about 1000K above ground. Thus, the molecular region must be warm. The superposition of the line and continuum regions may be more than just chance; the maser region may represent the remnant of the collapse of a cloud which has formed the HII region. C1 USN, RES LAB, CTR ADV SPACE SENSING, WASHINGTON, DC 20375 USA. RP WILSON, TL (reprint author), MAX PLANCK INST RADIOASTRON, HUGEL 69, W-5300 BONN 1, GERMANY. NR 15 TC 5 Z9 5 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 NOV PY 1991 VL 251 IS 1 BP L7 EP L10 PG 4 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA GM776 UT WOS:A1991GM77600003 ER PT J AU CHENG, CC PALLAVICINI, R AF CHENG, CC PALLAVICINI, R TI NUMERICAL SIMULATIONS OF FLARES ON M-DWARF STARS .1. HYDRODYNAMICS AND CORONAL X-RAY-EMISSION SO ASTROPHYSICAL JOURNAL LA English DT Article DE HYDRODYNAMICS; STARS, CORONAE; STARS, FLARE; STARS, LATE-TYPE; STARS, X-RAYS ID LOOP RADIATIVE HYDRODYNAMICS; STELLAR FLARES; SMM OBSERVATIONS; SOLAR-FLARES; TEMPERATURES; MODEL; GASDYNAMICS; EVOLUTION; EINSTEIN; DYNAMICS AB In order to understand the large variety of physical parameters observed in stellar X-ray flares, and their time evolution, we have made a series of numerical simulations of flare loop models with different values of loop size, flare energy input, and initial loop conditions. Our purpose is to study in detail the physics of flare hydrodynamic processes and to determine how the hydrodynamic evolution varies in parameter space. Our model solves the full set of mass, energy, and momentum equations in a magnetically confined loop structure which extends from the chromosphere to the corona. The computed results involve important physical processes such as the expansion of heated coronal gas, the evaporation of chromospheric material, the compression of the plasma at the loop footpoints, the gradual and/or catastrophic cooling of the gas during the decay phase. We also calculated the expected X-ray emission and compared it with X-ray light curves obtained by the EXOSAT satellite. Our simulations can reproduce the general characteristics of the observed X-ray flares, including their intensities, time profiles, and average coronal temperatures. We find that it is possible to produce X-ray emission measures of up to approximately 10(52) cm-3 with fairly small loops with a total length of only 2 x 10(9) cm. Small- and medium-sized flares can thus be produced in short loops, in contrast to previous conclusions that required large loops, of the size of a stellar radius, even for small flares. We find, however, that the amount of material that can be evaporated from the chromosphere does not vary linearly with the flare energy input, thus making increasingly more difficult to obtain large emission measures by simply increasing the energy input in a small loop. Under physically realistic conditions, large loops with length of approximately 8 x 10(9) cm are required to produce the largest emission measures (approximately 10(53) cm-3) observed in stellar flares. The large evaporation velocities of more than 400 km s-1 predicted by our models should be observable as blue shifts in X-ray line profiles with the high resolution spectrometers planned for future X-ray missions such as AXAF. C1 OSSERV ASTROFIS ARCETRI, FLORENCE, ITALY. RP USN, RES LAB, EO HULBURT CTR SPACE RES, WASHINGTON, DC 20375 USA. NR 57 TC 10 Z9 10 U1 0 U2 0 PU IOP PUBLISHING LTD PI BRISTOL PA TEMPLE CIRCUS, TEMPLE WAY, BRISTOL BS1 6BE, ENGLAND SN 0004-637X EI 1538-4357 J9 ASTROPHYS J JI Astrophys. J. PD NOV 1 PY 1991 VL 381 IS 1 BP 234 EP 249 DI 10.1086/170645 PN 1 PG 16 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA GM575 UT WOS:A1991GM57500023 ER PT J AU STERLING, AC MARISKA, JT SHIBATA, K SUEMATSU, Y AF STERLING, AC MARISKA, JT SHIBATA, K SUEMATSU, Y TI NUMERICAL SIMULATIONS OF MICROFLARE EVOLUTION IN THE SOLAR TRANSITION REGION AND CORONA SO ASTROPHYSICAL JOURNAL LA English DT Article DE SUN, CORONA; SUN, FLARES; SUN, TRANSITION REGION ID FLUX-CORRECTED TRANSPORT; LOOP RADIATIVE HYDRODYNAMICS; DYNAMICS; EVENTS; FLARES; OSO-8; ZONE; MASS; SUN AB Several observers report transient ultraviolet brightenings, often referred to as microflares, in the solar atmosphere. In this paper, we present the results of a series of one-dimensional numerical simulations examining possible relationships between microflares and the generation of dynamical chromospheric and transition region features. We assume that the microflare energy deposition is localized just below the transition region on one side of a 22,000 km long quiet region coronal loop. Low-energy (10(24) ergs; approximately 1 ergs cm-3 s-1) and medium-energy (10(25) ergs; approximately 10 ergs cm-3 s-1) microflares eject long-lived cool, dense gas plugs into the corona, with the gas plug traversing the loop apex in the medium energy case. In the case of high-energy (10(26) ergs; approximately 100 ergs cm-3 s-1) microflares, the gas plug is rapidly (approximately 10 s) heated to the temperature of the surrounding corona, and the results resemble the dynamics occurring in standard solar flare thick-target electron beam models. The gas flows and ejections which develop in our simulations do not resemble spicules, but they may represent some of the dynamic (v approximately 100 km s-1) features seen in ultraviolet spectral lines. The high-energy microflare produces sustained (approximately 300 s) coronal temperature increases of 2-4 times the initial (7.7 x 10(5) K) value, and density increases of 3-6 times the initial value at the loop apex. Weaker microflares do not produce prolonged significant heating or density increases. C1 KYOTO UNIV, FAC SCI, DEPT ASTRON, KYOTO 606, JAPAN. AICHI UNIV EDUC, DEPT EARTH SCI, KARIYA, AICHI 448, JAPAN. NATL ASTRON OBSERV, TOKYO 181, JAPAN. RP USN, RES LAB, EO HULBURT CTR SPACE RES, CODE 4175S, WASHINGTON, DC 20375 USA. NR 31 TC 20 Z9 20 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 NOV 1 PY 1991 VL 381 IS 1 BP 313 EP 322 DI 10.1086/170653 PN 1 PG 10 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA GM575 UT WOS:A1991GM57500031 ER PT J AU ATHAY, RG DERE, KP AF ATHAY, RG DERE, KP TI VELOCITY-GRADIENTS IN THE CHROMOSPHERE-CORONA TRANSITION REGION SO ASTROPHYSICAL JOURNAL LA English DT Article DE SUN, ATMOSPHERIC MOTIONS; SUN, SPECTRA; SUN, TRANSITION REGION; ULTRAVIOLET, SPECTRA ID SOLAR ACTIVE REGIONS; TEMPERATURE AB Velocity data obtained from Doppler shifts of EUV spectral lines observed with the High Resolution Telescope and Spectrograph flown on Spacelab II are analyzed to determine the properties of the mean velocities VBAR and its spatial variance V-sigma, for chromospheric and transition region lines. The lines studied include the ions O I, C I, Fe II, C II, Si III, Si IV, and C IV. Observations were made using 11 radial slit positions covering a rectangular area approximately 850" in length and 30" wide with a spatial resolution of 1" and 3" spacing between slits. The constancy of V-sigma from center to limb together with a systematic maximum redshift in VBAR in central disk regions is interpreted to mean that the plasma flow is divergent from the tops of closed field lines and that the cool plasma more or less fills the magnetic loops from which most of the radiation originates. The same is true of the hotter plasma. It is suggested that the crossfield component of del T is large and that the alternation from cool loops to hot loops occurs on spatial scales much less than 1". Each fine-structure loop within the temperature range characterizing a given ion is assumed to have a peculiar flow velocity, V(i). The dispersion in V(i) is identified with the non-thermal line width, zeta, and the mean V(i) is identified with VBAR and its large-scale spatial fluctuations, V-sigma. C1 USN, RES LAB, EO HULBURT CTR SPACE RES, WASHINGTON, DC 20375 USA. RP NATL CTR ATMOSPHER RES, HIGH ALTITUDE OBSERV, POB 3000, BOULDER, CO 80307 USA. NR 14 TC 15 Z9 15 U1 0 U2 0 PU IOP PUBLISHING LTD PI BRISTOL PA TEMPLE CIRCUS, TEMPLE WAY, BRISTOL BS1 6BE, ENGLAND SN 0004-637X EI 1538-4357 J9 ASTROPHYS J JI Astrophys. J. PD NOV 1 PY 1991 VL 381 IS 1 BP 323 EP + DI 10.1086/170654 PN 1 PG 1 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA GM575 UT WOS:A1991GM57500032 ER PT J AU WALTMAN, EB FIEDLER, RL JOHNSTON, KJ SPENCER, JH FLORKOWSKI, DR JOSTIES, FJ MCCARTHY, DD MATSAKIS, DN AF WALTMAN, EB FIEDLER, RL JOHNSTON, KJ SPENCER, JH FLORKOWSKI, DR JOSTIES, FJ MCCARTHY, DD MATSAKIS, DN TI DAILY OBSERVATIONS OF COMPACT RADIO-SOURCES AT 2.7 AND 8.1 GHZ - 1979-1987 SO ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES LA English DT Article DE RADIO SOURCES, VARIABLE ID FLUX-DENSITY VARIATIONS; 8085 MHZ; SCINTILLATION; CYGNUS-X-3; SS-433 AB We present 2.7 and 8.1 GHz radio light curves for 46 compact radio sources observed with the Green Bank interferometer during the period 1979-1987. Flux densities for the period 1979-1985 were reported in a previous paper. The flux densities reported here extend the daily monitoring an additional 2 years. This marks the end of the dual use of the interferometer by the US Naval Observatory to measure Earth rotation parameters and by the Naval Research Laboratory to study compact source variability. The interferometer is currently dedicated to searching for extreme scattering events (ESEs). ESEs may be found in the radio light curves of 0300 + 470, 0333 + 321, 0954 + 658, 1502 + 106, 1611 + 343, 1821 + 107, and 2352 + 495 during the period 1979-1987, including three events observed in 0300 + 470 and 0333 + 321 during the additional 2 years reported here. C1 USN OBSERV,WASHINGTON,DC 20392. RP WALTMAN, EB (reprint author), USN,RES LAB,CTR ADV SPACE SENSING,CODE 4210,WASHINGTON,DC 20375, USA. NR 19 TC 53 Z9 53 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 NOV PY 1991 VL 77 IS 3 BP 379 EP 404 DI 10.1086/191609 PG 26 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA GM875 UT WOS:A1991GM87500003 ER PT J AU TEMME, LA RICKS, E MORRIS, A SHERRY, D AF TEMME, LA RICKS, E MORRIS, A SHERRY, D TI VISUAL CONTRAST SENSITIVITY OF UNITED-STATES NAVY JET PILOTS SO AVIATION SPACE AND ENVIRONMENTAL MEDICINE LA English DT Article ID SCREENING-TEST; THRESHOLD; VISIBILITY; DEPENDENCE; GRATINGS AB Good visual contrast sensitivity (CS) is often described as a visual capability important for success as a military aviator and so has been suggested as a physical standard for personnel selection and retention. To evaluate this idea, we measured the CS of 135 U.S. Navy fighter pilots ranging in age from 24 to 44 years (mean = 30.20, S.D. = 4.06) and compared these to the CS of non-aviators. We obtained the non-aviator data from published studies of other investigators who used similar procedures with the same widely used, commercially available apparatus (Nicolet CST 2000). In addition to this comparison, we correlated the pilots' CS with their air-to-air target detection distances measured during air combat maneuver training and to their night carrier landing performance scores. The major findings were: 1) The mean CS of the aviators and the non-aviators were within +/- 1.0 S.D. of each other in most instances, and those few instances where a greater difference was found were parsimoniously explained by methodological and procedural factors; 2) sensitivities to different spatial frequencies were highly correlated among themselves, indicating much redundancy among the measurements; 3) there was no evidence of a relationship between CS and air-to-air target detection distances or night carrier landing performance. RP TEMME, LA (reprint author), NAVAL AEROSP MED RES LAB,NAVAL AIR STN,PENSACOLA,FL 32508, USA. NR 25 TC 2 Z9 2 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 NOV PY 1991 VL 62 IS 11 BP 1032 EP 1036 PG 5 WC Public, Environmental & Occupational Health; Medicine, General & Internal; Sport Sciences SC Public, Environmental & Occupational Health; General & Internal Medicine; Sport Sciences GA GM888 UT WOS:A1991GM88800003 PM 1741716 ER PT J AU CHEUNG, TK AF CHEUNG, TK TI SODAR OBSERVATIONS OF THE STABLE LOWER ATMOSPHERIC BOUNDARY-LAYER AT BARROW, ALASKA SO BOUNDARY-LAYER METEOROLOGY LA English DT Article ID ARCTIC LEADS; WAVES; SOUNDER; TOWER; HEAT AB Events in the stably stratified lower atmospheric boundary layer within the first several hundreds of meters at Barrow, Alaska were recorded from 27 March to 5 April 1990 using an acoustic sounder (sodar), a tethered balloon, radiosondes, and an instrumented meteorological tower. These events include ground-based and low-level inversion layers, gravity waves, breaking waves, and multiple-layer structures. Even though these events are commonly found in a stable boundary layer, it is perhaps surprising to find them in such a slowly changing environment and over a terrain that is essentially devoid of immediate orographic influence. C1 NOAA,ENVIRONM RES LAB,BOULDER,CO 80303. RP CHEUNG, TK (reprint author), USN,OCEANOG & ATMOSPHER RES LAB,ATMOSPHER DIRECTORATE,MONTEREY,CA 93943, USA. NR 29 TC 11 Z9 11 U1 0 U2 0 PU KLUWER ACADEMIC PUBL PI DORDRECHT PA SPUIBOULEVARD 50, PO BOX 17, 3300 AA DORDRECHT, NETHERLANDS SN 0006-8314 J9 BOUND-LAY METEOROL JI Bound.-Layer Meteor. PD NOV PY 1991 VL 57 IS 3 BP 251 EP 274 DI 10.1007/BF00120887 PG 24 WC Meteorology & Atmospheric Sciences SC Meteorology & Atmospheric Sciences GA GM289 UT WOS:A1991GM28900003 ER PT J AU FEDERICO, PA AF FEDERICO, PA TI VERBAL PROTOCOLS AND COMPLICATED PERFORMANCE SO BULLETIN OF THE PSYCHONOMIC SOCIETY LA English DT Meeting Abstract C1 USN,CTR PERSONNEL RES & DEV,WASHINGTON,DC 20350. NR 0 TC 0 Z9 0 U1 0 U2 0 PU PSYCHONOMIC SOC INC PI AUSTIN PA 1710 FORTVIEW RD, AUSTIN, TX 78704 SN 0090-5054 J9 B PSYCHONOMIC SOC PD NOV PY 1991 VL 29 IS 6 BP 479 EP 479 PG 1 WC Psychology, Mathematical SC Psychology GA GL115 UT WOS:A1991GL11500076 ER PT J AU GISINER, RC SCHUSTERMAN, RJ AF GISINER, RC SCHUSTERMAN, RJ TI COMPLEX CONDITIONAL RELATIONSHIPS LEARNED BY A LANGUAGE-TRAINED SEA LION SO BULLETIN OF THE PSYCHONOMIC SOCIETY LA English DT Meeting Abstract C1 USN,CTR OCEAN SYST,KAILUA,HI 96734. NR 0 TC 0 Z9 0 U1 0 U2 1 PU PSYCHONOMIC SOC INC PI AUSTIN PA 1710 FORTVIEW RD, AUSTIN, TX 78704 SN 0090-5054 J9 B PSYCHONOMIC SOC PD NOV PY 1991 VL 29 IS 6 BP 486 EP 486 PG 1 WC Psychology, Mathematical SC Psychology GA GL115 UT WOS:A1991GL11500151 ER PT J AU SCHUSTERMAN, RJ GRIMM, B GISINER, RC HANGGI, E AF SCHUSTERMAN, RJ GRIMM, B GISINER, RC HANGGI, E TI RETROACTIVE INTERFERENCE OF DELAYED SYMBOLIC MATCHING TO SAMPLE IN CALIFORNIA SEA LIONS SO BULLETIN OF THE PSYCHONOMIC SOCIETY LA English DT Meeting Abstract C1 UNIV CALIF SANTA CRUZ,SANTA CRUZ,CA 95064. USN,KAILUA,HI 96734. NR 0 TC 0 Z9 0 U1 0 U2 2 PU PSYCHONOMIC SOC INC PI AUSTIN PA 1710 FORTVIEW RD, AUSTIN, TX 78704 SN 0090-5054 J9 B PSYCHONOMIC SOC PD NOV PY 1991 VL 29 IS 6 BP 486 EP 486 PG 1 WC Psychology, Mathematical SC Psychology GA GL115 UT WOS:A1991GL11500152 ER PT J AU ROITBLAT, HL HELWEG, DA MOORE, PWB NACHTIGALL, PE AF ROITBLAT, HL HELWEG, DA MOORE, PWB NACHTIGALL, PE TI MATERIAL MATCHING BY A BOTTLE-NOSED-DOLPHIN SO BULLETIN OF THE PSYCHONOMIC SOCIETY LA English DT Meeting Abstract C1 UNIV HAWAII MANOA,HONOLULU,HI 96822. USN,CTR OCEAN SYST,HAWAII LAB,KAILUA,HI 96734. NR 0 TC 0 Z9 0 U1 0 U2 2 PU PSYCHONOMIC SOC INC PI AUSTIN PA 1710 FORTVIEW RD, AUSTIN, TX 78704 SN 0090-5054 J9 B PSYCHONOMIC SOC PD NOV PY 1991 VL 29 IS 6 BP 504 EP 504 PG 1 WC Psychology, Mathematical SC Psychology GA GL115 UT WOS:A1991GL11500349 ER PT J AU NACHTIGALL, PE PAWLOSKI, JL AF NACHTIGALL, PE PAWLOSKI, JL TI AERIAL VISUAL-ACUITY OF A RISSO DOLPHIN AT 2 DISTANCES SO BULLETIN OF THE PSYCHONOMIC SOCIETY LA English DT Meeting Abstract C1 USN,OCEAN SYST CTR,HAWAII LAB,HONOLULU,HI. SCI APPLICAT INT CORP,LA JOLLA,CA 92037. NR 0 TC 0 Z9 0 U1 0 U2 0 PU PSYCHONOMIC SOC INC PI AUSTIN PA 1710 FORTVIEW RD, AUSTIN, TX 78704 SN 0090-5054 J9 B PSYCHONOMIC SOC PD NOV PY 1991 VL 29 IS 6 BP 528 EP 528 PG 1 WC Psychology, Mathematical SC Psychology GA GL115 UT WOS:A1991GL11500611 ER PT J AU DUFFY, DG AF DUFFY, DG TI THE RESPONSE OF FLOATING ICE TO A MOVING, VIBRATING LOAD SO COLD REGIONS SCIENCE AND TECHNOLOGY LA English DT Article ID SEA ICE; WAVES; PLATE AB We investigated the wave motion in floating sea ice that results from a moving, vibrating load. For a fixed driving frequency, increasing the speed of the load results in shorter, smaller amplitude waves ahead ana longer, larger amplitude waves behind the load. For realistic loads, the mass of the load may be neglected. If the mass of the load is small, then resonant solutions are found. RP DUFFY, DG (reprint author), USN ACAD,DEPT MATH,ANNAPOLIS,MD 21403, USA. NR 28 TC 7 Z9 9 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0165-232X J9 COLD REG SCI TECHNOL JI Cold Reg. Sci. Tech. PD NOV PY 1991 VL 20 IS 1 BP 51 EP 64 DI 10.1016/0165-232X(91)90056-M PG 14 WC Engineering, Environmental; Engineering, Civil; Geosciences, Multidisciplinary SC Engineering; Geology GA GT110 UT WOS:A1991GT11000006 ER PT J AU KANG, CS PARK, EK HERZOG, JH AF KANG, CS PARK, EK HERZOG, JH TI HYBRID-TOKEN RING - A LOAD SHARING LOCAL AREA NETWORK SO COMPUTER COMMUNICATIONS LA English DT Article DE LOCAL AREA NETWORKS; TOKEN RING; DATA LINKS; CONCURRENT COMMUNICATION; LOAD SHARING; DISTRIBUTED COMPUTING; MEDIUM ACCESS CONTROL PROTOCOL AB A load sharing network, Hybrid-token ring, which can connect computers and communicating devices for real-time and/or interactive applications, is presented. Hybrid-token ring has a dual channel structure, a token ring and a data channel. The token ring is a modification of ANSI/IEEE LAN standard 802.5. The data channel is a collection of full-duplex data links. With this architecture, an insertion of direct data links not only allow real-time and/or interactive communications between node pairs, but also improves overall network performance in a token ring. A medium access control (MAC) protocol for the network is developed, and specifications for the MAC layer are described. Aso, a finite state machine for data link channel interface is devised. A simulation model has been developed to measure a performance improvement of hybrid-token ring over a pure token ring. Simulation results indicate that a small increase in link cost for data links can greatly improve performance over a pure token ring before the insertion of the data links. C1 USN ACAD,DEPT COMP SCI,ANNAPOLIS,MD 21402. OREGON STATE UNIV,DEPT ELECT & COMP ENGN,CORVALLIS,OR 97331. OREGON STATE UNIV,FAC ELECT & COMP ENGN,CORVALLIS,OR 97331. RP KANG, CS (reprint author), AMERICAN UNIV,DEPT COMP SCI & INFORMAT SYST,WASHINGTON,DC 20016, USA. NR 36 TC 1 Z9 1 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0140-3664 J9 COMPUT COMMUN JI Comput. Commun. PD NOV PY 1991 VL 14 IS 9 BP 525 EP 533 DI 10.1016/0140-3664(91)90110-M PG 9 WC Computer Science, Information Systems; Engineering, Electrical & Electronic; Telecommunications SC Computer Science; Engineering; Telecommunications GA GQ319 UT WOS:A1991GQ31900003 ER PT J AU PECKINPAUGH, SH AF PECKINPAUGH, SH TI AN IMPROVED METHOD FOR COMPUTING GRAY-LEVEL COOCCURRENCE MATRIX BASED TEXTURE MEASURES SO CVGIP-GRAPHICAL MODELS AND IMAGE PROCESSING LA English DT Note ID CLASSIFICATION RP PECKINPAUGH, SH (reprint author), USN,OCEANOG & ATMOSPHER RES LAB,STENNIS SPACE CTR,MS 39529, USA. NR 10 TC 18 Z9 19 U1 0 U2 1 PU ACADEMIC PRESS INC JNL-COMP SUBSCRIPTIONS PI SAN DIEGO PA 525 B ST, STE 1900, SAN DIEGO, CA 92101-4495 SN 1049-9652 J9 CVGIP-GRAPH MODEL IM PD NOV PY 1991 VL 53 IS 6 BP 574 EP 580 DI 10.1016/1049-9652(91)90007-7 PG 7 WC Computer Science, Software Engineering SC Computer Science GA GP003 UT WOS:A1991GP00300007 ER PT J AU DOLK, DR KRIDEL, DJ AF DOLK, DR KRIDEL, DJ TI AN ACTIVE MODELING SYSTEM FOR ECONOMETRIC-ANALYSIS SO DECISION SUPPORT SYSTEMS LA English DT Article DE ACTIVE DSS; ECONOMETRIC MODELING; MODEL CONTROL LANGUAGE; SCHEMA; PROCESS MANAGER; INFERENCE PROCESSOR; DEMON AB This paper examines the feasibility of developing an "artificially intelligent econometrician" as an active decision support system (ADSS) in the sense articulated by [Manheim, 1988]. We review the system components of an ADSS and then relate them to a modeling system for econometric analysis that we have implemented. We present the query language of the PERM (Progressive EconometRic Modeling) system and offer an extension to the language based on process-oriented constructs for model integration. The query language and its extension correspond to the ADSS's user-directed and computer-directed process managers, respectively. Schemas representing statistical strategies are stored as processes in the extended language and serve as the econometric knowledge base. We suggest an approach to building an inference processor for this system based on experiments to record user query protocols and relate them to the schemas in the knowledge base. The connection between user processes and schemas is implemented by demon constructs in the extended language. Finally, we examine the extent to which our proposed system constitutes an ADSS. RP DOLK, DR (reprint author), USN,POSTGRAD SCH,MONTEREY,CA 93943, USA. NR 0 TC 9 Z9 9 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0167-9236 J9 DECIS SUPPORT SYST JI Decis. Support Syst. PD NOV PY 1991 VL 7 IS 4 BP 315 EP 328 DI 10.1016/0167-9236(91)90061-F PG 14 WC Computer Science, Artificial Intelligence; Computer Science, Information Systems; Operations Research & Management Science SC Computer Science; Operations Research & Management Science GA GR248 UT WOS:A1991GR24800003 ER PT J AU MARMORINO, GO AF MARMORINO, GO TI INTRUSIONS AND DIFFUSIVE INTERFACES IN A SALT-FINGER STAIRCASE SO DEEP-SEA RESEARCH PART A-OCEANOGRAPHIC RESEARCH PAPERS LA English DT Article ID THERMOHALINE STAIRCASE; NORTHEAST COAST; SOUTH-AMERICA; DENSITY RATIO; C-SALT; MICROSTRUCTURE; TURBULENCE; CONVECTION; SIGNATURES; STEPS AB Towed thermistor chain measurements in the fingering-favorable staircase east of Barbados show that the approximately 20-m thick layers often are not isothermal but contain kilometer-long regions of temperature inversion stabilized by salinity. Each inversion appears to be the upper boundary of an intrusion of relatively warm, salty water. Stratification across the inversion is favorable for diffusive convection (diffusive density ratio approximately 1.2), and towed microstructure signals show evidence of thin, horizontal diffusive interfaces, although some microstructure may be the result of shear-induced turbulence. A plausible hypothesis is that the intrusions form at the edges of mesoscale eddies which bring together water from the same layer but with different temperature and salinity. RP MARMORINO, GO (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 40 TC 12 Z9 12 U1 0 U2 0 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0198-0149 J9 DEEP-SEA RES PD NOV PY 1991 VL 38 IS 11 BP 1431 EP 1454 DI 10.1016/0198-0149(91)90015-8 PG 24 WC Oceanography SC Oceanography GA GR744 UT WOS:A1991GR74400005 ER PT J AU BRANDT, DW BURTON, DW GAZDAR, AF OIE, HE DEFTOS, LJ AF BRANDT, DW BURTON, DW GAZDAR, AF OIE, HE DEFTOS, LJ TI ALL MAJOR LUNG-CANCER CELL-TYPES PRODUCE PARATHYROID HORMONE-LIKE PROTEIN - HETEROGENEITY ASSESSED BY HIGH-PERFORMANCE LIQUID-CHROMATOGRAPHY SO ENDOCRINOLOGY LA English DT Article ID PEPTIDE; GENE; HYPERCALCEMIA; ENDOCRINE; TUMORS; IDENTIFICATION; PURIFICATION; CHROMOGRANIN; EXPRESSION; CARCINOMA AB We examined the production of parathyroid hormone-like protein (PLP) by all major lung cancer cell types, including epidermoid, small cell, and adenocarcinoma. We demonstrated that cell lines derived from each cell type released PLP into culture medium. To determine the predominant species of PLP produced by the cell lines, guanidine hydrochloride extracts were prepared and analyzed for PLP by high performance size exclusion chromatography under denaturing conditions. Cell lines from each of the major lung tumors produced multiple and different forms of PLP. The estimated molecular sizes of the PLP species ranged from 3.5-11.7 kilodaltons. Our results demonstrate that PLP is produced by all major lung cancer cell types and extend these observations to adenocarcinoma and large cell carcinomas of the lung. Furthermore, we observed PLP heterogeneity among these different cell types, which may represent tissue-specific PLP processing among different human lung tumors. C1 UNIV CALIF SAN DIEGO,DEPT MED,SAN DIEGO,CA 92103. VET ADM MED CTR,SAN DIEGO,CA 92161. NIH,USN,MED ONCOL BRANCH,BETHESDA,MD 20814. NR 27 TC 64 Z9 64 U1 0 U2 0 PU ENDOCRINE SOC PI BETHESDA PA 4350 EAST WEST HIGHWAY SUITE 500, BETHESDA, MD 20814-4110 SN 0013-7227 J9 ENDOCRINOLOGY JI Endocrinology PD NOV PY 1991 VL 129 IS 5 BP 2466 EP 2470 PG 5 WC Endocrinology & Metabolism SC Endocrinology & Metabolism GA GM349 UT WOS:A1991GM34900029 PM 1935781 ER PT J AU GRIGOROV, NL KONDRATYEVA, MA PANASYUK, MI TRETYAKOVA, CA ADAMS, JH BLAKE, JB SCHULZ, M MEWALDT, RA TYLKA, AJ AF GRIGOROV, NL KONDRATYEVA, MA PANASYUK, MI TRETYAKOVA, CA ADAMS, JH BLAKE, JB SCHULZ, M MEWALDT, RA TYLKA, AJ TI EVIDENCE FOR TRAPPED ANOMALOUS COSMIC-RAY OXYGEN IONS IN THE INNER MAGNETOSPHERE SO GEOPHYSICAL RESEARCH LETTERS LA English DT Article ID SKYLAB AB A series of measurements of 5-30 MeV/nucleon oxygen ions made with track detector stacks on Cosmos satellites show isotropic angular distributions during solar energetic particle events. Solar-quiet times, on the other hand, have highly anisotropic distributions suggestive of a trapped-particle component. Detailed Monte Carlo simulations confirm this interpretation and allow us to measure the trapped and cosmic-ray contributions to the observed fluxes. Our data are fully consistent with anomalous cosmic-ray ions, rather than radial diffusion from the outer zone, as the source of the trapped particles. C1 USN, ED HULBURT CTR SPACE RES, RES LAB, WASHINGTON, DC 20375 USA. AEROSPACE CORP, CTR SPACE & ENVIRONM TECHNOL, LOS ANGELES, CA 90009 USA. CALTECH, DOWNS LAB 22047, PASADENA, CA 91125 USA. UNIV SPACE RES ASSOC, COLUMBIA, MD USA. RP MV LOMONOSOV STATE UNIV, INST NUCL PHYS, MOSCOW 119899, USSR. RI Panasyuk, Mikhail/E-2005-2012; Tylka, Allan/G-9592-2014 NR 16 TC 43 Z9 43 U1 0 U2 0 PU AMER GEOPHYSICAL UNION PI WASHINGTON PA 2000 FLORIDA AVE NW, WASHINGTON, DC 20009 USA SN 0094-8276 EI 1944-8007 J9 GEOPHYS RES LETT JI Geophys. Res. Lett. PD NOV PY 1991 VL 18 IS 11 BP 1959 EP 1962 DI 10.1029/91GL02551 PG 4 WC Geosciences, Multidisciplinary SC Geology GA GP755 UT WOS:A1991GP75500008 ER PT J AU KOZO, TL AF KOZO, TL TI THE HYBRID POLYNYA AT THE NORTHERN END OF NARES STRAIT SO GEOPHYSICAL RESEARCH LETTERS LA English DT Article ID SEA ICE; WATER; OCEANOGRAPHY AB NOAA satellite images (November through June 1984 to 1989) show sea ice arches accompanied by unique polynya patterns immediately north of the Nares Strait. Typically the arches formed by late November, but the polynya patterns did not stabilize until January, the month when sea ice transport through the Strait usually ceases. The polynyas created to the lee of the arches appear to be of an unusual "hybrid" mix, switching from a combined latent and sensible heat type in fall to a "pure" sensible heat type in winter. Early in the polynya formation, sea ice is removed through the temporarily open Nares Strait, while the ice arch to the north blocks ice from drifting into the polynya. Once the Strait freezes solid, newly formed ice cannot be transported downstream. The polynya then begins to freeze but ice growth is still moderated apparently due to upward vertical mixing of warmer, more saline water generated by tidal currents flowing over the shallow seabed northwest of Robeson Channel. RP KOZO, TL (reprint author), USN,OCEANOG & ATMOSPHER RES LAB,POLAR OCEANOG BRANCH OFF CODE 332,72 LYME RD,HANOVER,NH 03755, USA. NR 18 TC 6 Z9 6 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 NOV PY 1991 VL 18 IS 11 BP 2059 EP 2062 DI 10.1029/91GL02574 PG 4 WC Geosciences, Multidisciplinary SC Geology GA GP755 UT WOS:A1991GP75500033 ER PT J AU FOSS, RD LASKIN, WB LOMBARDI, DP MORTON, AL SNYDER, J AF FOSS, RD LASKIN, WB LOMBARDI, DP MORTON, AL SNYDER, J TI ANAPLASTIC LARGE CELL LYMPHOMA SO HEAD AND NECK-JOURNAL FOR THE SCIENCES AND SPECIALTIES OF THE HEAD AND NECK LA English DT Article ID NON-HODGKINS-LYMPHOMAS; KI-1 LYMPHOMA; ANTIGEN; MALIGNANCIES; EXPRESSION; DIAGNOSIS AB Anaplastic large cell lymphoma (ALCL) or Ki-1 lymphoma is a recently described and distinctive non-Hodgkin's lymphoma. Cervicofacial adenopathy caused by ALCL may mimic involvement by metastatic carcinoma or other malignancies common to the head and neck. A case in which ALCL was originally interpreted as metastatic nasopharyngeal carcinoma is presented. The clinicopathologic features of this uncommon entity are discussed. C1 USN,CTR DENT,DEPT ORAL PATHOL,BETHESDA,MD 20814. USN,CTR DENT,DEPT ANAT PATHOL,BETHESDA,MD 20814. USN,CTR DENT,NCI MED ONCOL,BETHESDA,MD 20814. USN,CTR DENT,DEPT OTOLARYNGOL HEAD & NECK SURG,BETHESDA,MD 20814. USN,MED CTR,BETHESDA,MD 20814. NR 13 TC 2 Z9 2 U1 0 U2 2 PU JOHN WILEY & SONS INC PI NEW YORK PA 605 THIRD AVE, NEW YORK, NY 10158-0012 SN 1043-3074 J9 HEAD NECK-J SCI SPEC JI Head Neck-J. Sci. Spec. Head Neck PD NOV-DEC PY 1991 VL 13 IS 6 BP 545 EP 548 DI 10.1002/hed.2880130612 PG 4 WC Otorhinolaryngology; Surgery SC Otorhinolaryngology; Surgery GA GL575 UT WOS:A1991GL57500010 PM 1791148 ER PT J AU EDWARDS, JE ROSENFELD, P THOMAS, PJ AF EDWARDS, JE ROSENFELD, P THOMAS, PJ TI HISPANIC AND NON-HISPANIC WHITE NEW HIREES IN THE NAVY BLUE-COLLAR CIVILIAN WORK FORCE - A PILOT-STUDY SO HISPANIC JOURNAL OF BEHAVIORAL SCIENCES LA English DT Article RP EDWARDS, JE (reprint author), USN,CTR PERSONNEL RES & DEV,CODE 121,SAN DIEGO,CA 92152, USA. NR 13 TC 5 Z9 5 U1 0 U2 0 PU SAGE SCIENCE PRESS PI THOUSAND OAKS PA 2455 TELLER RD, THOUSAND OAKS, CA 91320 SN 0739-9863 J9 HISPANIC J BEHAV SCI JI Hisp. J. Behav. Sci. PD NOV PY 1991 VL 13 IS 4 BP 412 EP 421 DI 10.1177/07399863910134005 PG 10 WC Psychology, Multidisciplinary SC Psychology GA GP284 UT WOS:A1991GP28400005 ER PT J AU ZEISSE, CR HEWETT, CA NGUYEN, R ZEIDLER, JR WILSON, RG AF ZEISSE, CR HEWETT, CA NGUYEN, R ZEIDLER, JR WILSON, RG TI AN ION-IMPLANTED DIAMOND METAL-INSULATOR SEMICONDUCTOR FIELD-EFFECT TRANSISTOR SO IEEE ELECTRON DEVICE LETTERS LA English DT Article AB A p-type conducting layer has been formed. in a substrate of semi-insulating natural diamond (type IIa) by boron implantation. Silicon dioxide was deposited over this layer to make an insulated-gate field-effect transistor. Saturation and pinch-off were both observed at room temperature. The transconductance was 3.9-mu-S . mm-1 and the output conductance was 60 nS . mm-1. This is the first reported use of ion implantation to successfully fabricate a field-effect device in diamond. C1 HUGHES RES LABS,MALIBU,CA 90265. RP ZEISSE, CR (reprint author), USN,CTR OCEAN SYST,SAN DIEGO,CA 92152, USA. NR 10 TC 67 Z9 67 U1 0 U2 9 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0741-3106 J9 IEEE ELECTR DEVICE L JI IEEE Electron Device Lett. PD NOV PY 1991 VL 12 IS 11 BP 602 EP 604 DI 10.1109/55.119211 PG 3 WC Engineering, Electrical & Electronic SC Engineering GA GL479 UT WOS:A1991GL47900008 ER PT J AU BORDEN, B AF BORDEN, B TI DIVERSITY METHODS IN PHASE MONOPULSE TRACKING - A NEW APPROACH SO IEEE TRANSACTIONS ON AEROSPACE AND ELECTRONIC SYSTEMS LA English DT Article AB A novel approach relating target "glint" (difference between the phase-front gradient of the scattered field and the true target direction vector) to the analytic properties of the overall field is used to suggest a method by which the error in conventional ("single" frequency) phase monopulse trackers can be reduced. RP BORDEN, B (reprint author), USN,CTR WEAP,RES DEPT,CHINA LAKE,CA 93555, USA. NR 8 TC 4 Z9 4 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 0018-9251 J9 IEEE T AERO ELEC SYS JI IEEE Trans. Aerosp. Electron. Syst. PD NOV PY 1991 VL 27 IS 6 BP 877 EP 880 DI 10.1109/7.104249 PG 4 WC Engineering, Aerospace; Engineering, Electrical & Electronic; Telecommunications SC Engineering; Telecommunications GA GQ683 UT WOS:A1991GQ68300007 ER PT J AU GERLACH, K KRETSCHMER, FF AF GERLACH, K KRETSCHMER, FF TI CONVERGENCE PROPERTIES OF GRAM-SCHMIDT AND SMI ADAPTIVE ALGORITHMS - REPLY SO IEEE TRANSACTIONS ON AEROSPACE AND ELECTRONIC SYSTEMS LA English DT Article RP GERLACH, K (reprint author), USN,RES LAB,CODE 5341,WASHINGTON,DC 20375, USA. NR 12 TC 0 Z9 0 U1 0 U2 0 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0018-9251 J9 IEEE T AERO ELEC SYS JI IEEE Trans. Aerosp. Electron. Syst. PD NOV PY 1991 VL 27 IS 6 BP 899 EP 901 PG 3 WC Engineering, Aerospace; Engineering, Electrical & Electronic; Telecommunications SC Engineering; Telecommunications GA GQ683 UT WOS:A1991GQ68300014 ER PT J AU COCO, DS COKER, C DAHLKE, SR CLYNCH, JR AF COCO, DS COKER, C DAHLKE, SR CLYNCH, JR TI VARIABILITY OF GPS SATELLITE DIFFERENTIAL GROUP DELAY BIASES SO IEEE TRANSACTIONS ON AEROSPACE AND ELECTRONIC SYSTEMS LA English DT Article AB Global Positioning System (GPS) satellites can be used to measure the total electron columnar content of the ionosphere with relatively high accuracy and low cost. One of the most important limiting factors in using this technique, however, is the assessment of the differential instrumental delay biases between the L band frequencies in both the satellites and the receivers. These differential L2-L1 biases must be measured and removed from the GPS measurements before an accurate estimate of the total electron content can be obtained. A series of measurements from the Block I GPS satellites indicates that the combined satellite and receiver differential L2-L1 biases can be measured with an accuracy of 0.5 ns differential delay. An investigation of the variation of the satellite differential L2-L1 biases over a time span or five weeks shows that these biases are quite stable with time with less than 0.3 ns variation. A follow-up experiment conducted two years later showed that the satellite biases had not changed significantly over this longer time span. A comparison of the measured satellite differential biases with the prelaunch calibration values was made for four satellites. The measured biases for two of the satellites agreed with the prelaunch values to within the error estimates of the measurements, but the biases for the other two differed significantly. C1 IBM CORP,HOUSTON,TX 77058. USN,POSTGRAD SCH,MONTEREY,CA 93943. RP COCO, DS (reprint author), UNIV TEXAS,APPL RES LABS,POB 8029,AUSTIN,TX 78713, USA. NR 18 TC 97 Z9 104 U1 2 U2 5 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 NOV PY 1991 VL 27 IS 6 BP 931 EP 938 DI 10.1109/7.104264 PG 8 WC Engineering, Aerospace; Engineering, Electrical & Electronic; Telecommunications SC Engineering; Telecommunications GA GQ683 UT WOS:A1991GQ68300023 ER PT J AU VRANISH, JM NAIK, DP RESTORFF, JB TETER, JP AF VRANISH, JM NAIK, DP RESTORFF, JB TETER, JP TI MAGNETOSTRICTIVE DIRECT DRIVE ROTARY MOTOR DEVELOPMENT SO IEEE TRANSACTIONS ON MAGNETICS LA English DT Article; Proceedings Paper CT 5TH JOINT MMM-INTERMAG CONF CY JUN 18-21, 1991 CL PITTSBURGH, PA SP AKASHIC MEMORIES, ALLEGHENY LUDLUM, ALLIED SIGNAL, APPL MAGNET, ARMCO, ANORD ENGN, BASF AG, CERAM MAGNET, CRUCIBLE MAT, DASTEK AB Highly magnetostrictive materials such as Tb.3Dy.7Fe2, commercially known as TERFENOL-D, have been used to date in a variety of devices such as high power actuators and linear motors. The larger magnetostriction available in twinned single crystal TERFENOL-D, approximately 2000 ppm at moderate magnetic field strengths, makes possible a new generation of magneto-mechanical devices. The authors are investigating the potential of this material as the basis of a direct micro-stepping rotary motor. Such a motor would be a high torque micro-radian stepper, capable of precision movements and self-braking in the power off state. The thrust of this paper is to present one motor prototype being developed based on the proven "Inch Worm" technique. Results of mathematical modelling techniques will be presented, to include magnetic, structural and both linear and non-linear dynamic calculations. In addition, test results on prototype hardware will be presented. C1 USN,CTR SURFACE WARFARE R43,SILVER SPRING,MD 20903. RP VRANISH, JM (reprint author), NASA,GODDARD SPACE FLIGHT CTR,GREENBELT,MD 20771, USA. NR 6 TC 23 Z9 33 U1 1 U2 4 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0018-9464 J9 IEEE T MAGN JI IEEE Trans. Magn. PD NOV PY 1991 VL 27 IS 6 BP 5355 EP 5357 DI 10.1109/20.278837 PN 2 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied SC Engineering; Physics GA HB661 UT WOS:A1991HB66100233 ER PT J AU VOHRA, ST BUCHOLTZ, F AF VOHRA, ST BUCHOLTZ, F TI CHARACTERISTICS OF A PARAMETRIC MAGNETOSTRICTIVE OSCILLATOR SO IEEE TRANSACTIONS ON MAGNETICS LA English DT Article; Proceedings Paper CT 5TH JOINT MMM-INTERMAG CONF CY JUN 18-21, 1991 CL PITTSBURGH, PA SP AKASHIC MEMORIES, ALLEGHENY LUDLUM, ALLIED SIGNAL, APPL MAGNET, ARMCO, ANORD ENGN, BASF AG, CERAM MAGNET, CRUCIBLE MAT, DASTEK AB Parametric properties of a magnetostrictive oscillator are characterized by observing the strain dynamics of a magnetically excited metallic glass ribbon. A magnetostrictive ribbon excited by a total magnetic field H = H(dc) + h(p)cos(omega-t) + h(OMEGA)cos(OMEGA-t) generates strain responses at frequencies omega, OMEGA, omega +/- OMEGA thereby making the device resemble a parametric oscillator operating in the three photon mode. Close to an instability in the nonlinear strain dynamics of such materials, we observe dependence of the gain of the strain e(OMEGA) on pump amplitude h(p) and detuning frequency, while dc field dependent gain was observed in the strain e(omega +/- OMEGA). This behavior is generic to parametric devices and is not predicted by the quadratic coherent rotation model of magnetotriction. Experimental verification of greater than 35 dB small signal gain in a fiber optic ac magnetometer (FOM) is demonstrated. RP VOHRA, ST (reprint author), USN,RES LAB,CODE 6570,WASHINGTON,DC 20375, USA. NR 7 TC 0 Z9 0 U1 0 U2 0 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0018-9464 J9 IEEE T MAGN JI IEEE Trans. Magn. PD NOV PY 1991 VL 27 IS 6 BP 5361 EP 5363 DI 10.1109/20.278839 PN 2 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied SC Engineering; Physics GA HB661 UT WOS:A1991HB66100235 ER PT J AU CARROLL, TL PECORA, LM RACHFORD, FJ AF CARROLL, TL PECORA, LM RACHFORD, FJ TI USING NONLINEAR DYNAMICS TO UNDERSTAND SPIN-WAVE INTERACTIONS SO IEEE TRANSACTIONS ON MAGNETICS LA English DT Article; Proceedings Paper CT 5TH JOINT MMM-INTERMAG CONF CY JUN 18-21, 1991 CL PITTSBURGH, PA SP AKASHIC MEMORIES, ALLEGHENY LUDLUM, ALLIED SIGNAL, APPL MAGNET, ARMCO, ANORD ENGN, BASF AG, CERAM MAGNET, CRUCIBLE MAT, DASTEK ID YTTRIUM-IRON-GARNET; PARAMETRIC-EXCITATION; STRANGE ATTRACTORS; CHAOS; INSTABILITIES; SPHERE; MODES AB Nonlinear interactions in yttrium iron garnet cause complex, low frequency signals seen during ferromagnetic resonance experiments. Modelling this nonlinear behavior is difficult. Most attempts to model these low frequency oscillations have attempted to reproduce quantities such as oscillation frequency or instability threshold. We have been using methods from nonlinear dynamics to characterize complex behavior that we measure a ferromagnetic resonance experiments. We find that these quantities are useful in understanding the interactions in yttrium iron garnet. We also use very simple numerical models to suggest which quantities are most important in characterizing these spin wave interactions. RP CARROLL, TL (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. OI Carroll, Thomas/0000-0002-2371-2049 NR 14 TC 3 Z9 3 U1 0 U2 1 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0018-9464 J9 IEEE T MAGN JI IEEE Trans. Magn. PD NOV PY 1991 VL 27 IS 6 BP 5441 EP 5443 DI 10.1109/20.278865 PN 2 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied SC Engineering; Physics GA HB661 UT WOS:A1991HB66100261 ER PT J AU HOW, H LIU, Y ZHANG, S VITTORIA, C WEST, R CAROSELLA, C FOLEN, V AF HOW, H LIU, Y ZHANG, S VITTORIA, C WEST, R CAROSELLA, C FOLEN, V TI PRACTICAL DESIGN OF WIDE-STOPBAND FILTERS UTILIZING ASYMMETRIC CIRCULATORS SO IEEE TRANSACTIONS ON MAGNETICS LA English DT Article; Proceedings Paper CT 5TH JOINT MMM-INTERMAG CONF CY JUN 18-21, 1991 CL PITTSBURGH, PA SP AKASHIC MEMORIES, ALLEGHENY LUDLUM, ALLIED SIGNAL, APPL MAGNET, ARMCO, ANORD ENGN, BASF AG, CERAM MAGNET, CRUCIBLE MAT, DASTEK AB Wide-stopband filters in which the stopbands extend two octaves of the fundamental transmission frequencies have been realized in terms of asymmetrical Y-junction circulator designs. Experimentally measured transmission data of the devices compare very well with theory. C1 TRANS TECH INC,ADAMSTOWN,MD 21710. USN,RES LAB,WASHINGTON,DC 20375. RP HOW, H (reprint author), NORTHEASTERN UNIV,BOSTON,MA 02115, USA. NR 3 TC 0 Z9 0 U1 0 U2 0 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0018-9464 J9 IEEE T MAGN JI IEEE Trans. Magn. PD NOV PY 1991 VL 27 IS 6 BP 5474 EP 5476 DI 10.1109/20.278875 PN 2 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied SC Engineering; Physics GA HB661 UT WOS:A1991HB66100271 ER PT J AU ROZWOD, WJ THERRIEN, CW LIM, JS AF ROZWOD, WJ THERRIEN, CW LIM, JS TI DESIGN OF 2-D FIR FILTERS BY NONUNIFORM FREQUENCY SAMPLING SO IEEE TRANSACTIONS ON SIGNAL PROCESSING LA English DT Article AB A novel method for the frequency-sampling design of two-dimensional FIR filters with nonuniformly spaced samples is presented. By imposing some mild constraints on sample location in the 2-D frequency plane, the method always provides a unique design solution. Important characteristics of the method are design flexibility through the use of nonuniform samples and computational efficiency. Our method is compared with the uniform sampling, inverse DFT approach and also with a general method for filter design called arbitrary sampling. The method presented here is shown to require much less computation than the arbitrary sampling approach, which may lead to possible degenerate cases where there is no unique solution for the filter. The novel method does not lead to such degeneracies and possesses more flexibility than the uniform sampling method. Examples comparing the new method to the uniform sampling method are presented. C1 NAVAL POST GRAD SCH,DEPT ELECT & COMP ENGN,MONTEREY,CA 93943. MIT,DEPT ELECT ENGN & COMP SCI,CAMBRIDGE,MA 02139. RP ROZWOD, WJ (reprint author), USS BLUE RIDGE,LCC 19 FPO,SAN FRANCISCO,CA 96628, USA. NR 14 TC 13 Z9 13 U1 1 U2 7 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 1053-587X J9 IEEE T SIGNAL PROCES JI IEEE Trans. Signal Process. PD NOV PY 1991 VL 39 IS 11 BP 2508 EP 2514 DI 10.1109/78.98005 PG 7 WC Engineering, Electrical & Electronic SC Engineering GA GL708 UT WOS:A1991GL70800013 ER PT J AU MURPHY, JR GREZ, L SCHLESINGER, L FERRECCIO, C BAQAR, S MUNOZ, C WASSERMAN, SS LOSONSKY, G OLSON, JG LEVINE, MM AF MURPHY, JR GREZ, L SCHLESINGER, L FERRECCIO, C BAQAR, S MUNOZ, C WASSERMAN, SS LOSONSKY, G OLSON, JG LEVINE, MM TI IMMUNOGENICITY OF SALMONELLA-TYPHI TY21A VACCINE FOR YOUNG-CHILDREN SO INFECTION AND IMMUNITY LA English DT Note ID CELLULAR-IMMUNITY; SHIGELLA-SONNEI; ORAL VACCINE; FIELD TRIAL; CONSTRUCTION; EFFICACY; REGIONS; SAFETY; HUMANS; FEVER AB An attenuated Salmonella typhi Ty21a vaccine was administered to 18 infants and toddlers (less-than-or-equal-to 24 months old) to determine its safety and immunogenicity. The vaccination (10(9) CFU per dose, three doses) was well tolerated. However, after the vaccination there was no evidence of a humoral or cellular immune response to S. typhi. The vaccine used was known to be immunogenic for older children and adults. The results support the view that the immunogenicity of Ty21a is age dependent. C1 CATHOLIC UNIV CHILE, CTR DIAGNOST, SANTIAGO, CHILE. UNIV CHILE, INST NUTR & FOOD TECHNOL, IMMUNOL LAB, SANTIAGO, CHILE. MINIST SALUD, TYPHOID FEVER CONTROL PROGRAM, SANTIAGO, CHILE. UNIV MARYLAND, SCH MED, DEPT PEDIAT, DIV INFECT DIS & TROP PEDIAT, BALTIMORE, MD 21201 USA. USN, MED RES UNIT 3, CAIRO, EGYPT. UNIV TEXAS, HLTH SCI CTR, SCH PUBL HLTH, CTR INFECT DIS, HOUSTON, TX 77225 USA. RP MURPHY, JR (reprint author), UNIV MARYLAND, SCH MED, DEPT MED, DIV GEOG MED, CTR VACCINE DEV, BALTIMORE, MD 21201 USA. FU NIAID NIH HHS [N01-AI-62528] NR 22 TC 35 Z9 35 U1 0 U2 2 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 NOV PY 1991 VL 59 IS 11 BP 4291 EP 4293 PG 3 WC Immunology; Infectious Diseases SC Immunology; Infectious Diseases GA GM530 UT WOS:A1991GM53000068 PM 1937790 ER PT J AU STEIGERWALD, R LUQI MCDOWELL, J AF STEIGERWALD, R LUQI MCDOWELL, J TI CASE TOOL FOR REUSABLE SOFTWARE COMPONENT STORAGE AND RETRIEVAL IN RAPID PROTOTYPING SO INFORMATION AND SOFTWARE TECHNOLOGY LA English DT Article DE RAPID PROTOTYPING; COMPUTER-AIDED SOFTWARE ENGINEERING; CASE TOOL; REUSABILITY; REUSABLE COMPONENTS; SOFTWARE RETRIEVAL; SPECIFICATION; SOFTWARE ENGINEERING AB Rapid prototyping has become an accepted software development method to construct and adapt software, validate and refine requirements, and check the consistency of proposed designs rapidly. A computer-aided software engineering (CASE) tool is described that is used in conjunction with the Computer Aided Prototyping System (CAPS), which will retrieve reusable components from a software base using a given specification. The specification language used is the Prototype System Description Language (PSDL). Reusable Ada components will be stored in an object-oriented database management system with an appropriate PSDL specification. Each component's PSDL specification will be normalized to facilitate search retrieval. The database architecture, specification normalization, and matching techniques are described. RP STEIGERWALD, R (reprint author), NAVAL POST GRAD SCH, DEPT COMP SCI, MONTEREY, CA 93943 USA. NR 18 TC 3 Z9 4 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0950-5849 EI 1873-6025 J9 INFORM SOFTWARE TECH JI Inf. Softw. Technol. PD NOV PY 1991 VL 33 IS 9 BP 698 EP 706 DI 10.1016/0950-5849(91)90043-B PG 9 WC Computer Science, Information Systems; Computer Science, Software Engineering SC Computer Science GA GU379 UT WOS:A1991GU37900013 ER PT J AU HOWARD, RM GWILLIAM, DJ AF HOWARD, RM GWILLIAM, DJ TI POSTSTALL AIRFOIL RESPONSE TO A PERIODIC FREESTREAM SO JOURNAL OF AIRCRAFT LA English DT Note RP HOWARD, RM (reprint author), USN,POSTGRAD SCH,DEPT AERONAUT & ASTRONAUT,CODE AA-MO,MONTEREY,CA 93943, USA. NR 0 TC 0 Z9 0 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 NOV PY 1991 VL 28 IS 11 BP 799 EP 800 DI 10.2514/3.46099 PG 2 WC Engineering, Aerospace SC Engineering GA GR265 UT WOS:A1991GR26500018 ER PT J AU STOCKTON, W LODGE, J RACHFORD, F ORMAN, M FALCO, F SCHOEN, P AF STOCKTON, W LODGE, J RACHFORD, F ORMAN, M FALCO, F SCHOEN, P TI ARTIFICIAL DIELECTRIC-PROPERTIES OF MICROSCOPIC METALLIZED FILAMENTS IN COMPOSITES SO JOURNAL OF APPLIED PHYSICS LA English DT Article ID TUBULES; MICROSTRUCTURES AB Measurements have been made of the dielectric response of distributions of metallized fibers aligned in epoxy matrices for different loading fractions and fiber lengths. These have been shown to be in reasonable agreement with a simple independent particle theory. Use of the theory allows classification of fiber dielectric behavior by fiber conductivity and a characteristic length. Some aggregation of the fibers has been observed, even at relatively low loading densities. Computer simulation suggests enhanced dielectric constants of the composites for a moderate range of separations where the fibers are offset about 75% of their lengths with respect to each other and are closer than about 10 radii. This effect may be significant for aligned fibers which tend to aggregate in the magnetic field with separations and offsets within this range. The resulting composites are rugged and easily machined, and with less than 5% fiber weight loading have large, highly anisotropic dielectric constants of 60 or more at microwave frequencies in the X band. In conjunction with their (predicted) broadband performance characteristics such media should prove useful for a variety of applications. C1 SACHS FREEMAN ASSOCIATES INC,LANDOVER,MD 20785. USN,RES LAB,MAT PHYS BRANCH,WASHINGTON,DC 20375. RIVERSIDE RES INST,NEW YORK,NY 10036. RP STOCKTON, W (reprint author), USN,RES LAB,CTR BIOMOLEC SCI & ENGN,WASHINGTON,DC 20375, USA. NR 16 TC 22 Z9 22 U1 1 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 NOV 1 PY 1991 VL 70 IS 9 BP 4679 EP 4686 DI 10.1063/1.349059 PG 8 WC Physics, Applied SC Physics GA GN971 UT WOS:A1991GN97100003 ER PT J AU SIMONS, M CAMPISI, G HUGHES, HL AF SIMONS, M CAMPISI, G HUGHES, HL TI EVALUATION OF PULSED RADIATION EFFECTS IN BURIED OXIDES BY FAST C-V MEASUREMENTS SO JOURNAL OF APPLIED PHYSICS LA English DT Article ID SEMICONDUCTOR AB Fast C-V measurement techniques are utilized to simultaneously probe both upper and lower interfaces of silicon-on-insulator/separation by implantation of oxygen buried oxide capacitors following exposure to pulsed ionizing irradiation. In addition to the relatively stable radiation-induced positive charge, reverse annealing is observed from both Si-SiO2 interfaces over the 200-mu-s to 300 s post exposure interval; this behavior is consistent with electron detrapping within the oxide. The dependence of electron detrapping on dc annealing bias is attributed to field-enhanced emission effects. C1 USN,RES LAB,WASHINGTON,DC 20375. RP SIMONS, M (reprint author), RES TRIANGLE INST,RES TRIANGLE PK,NC 27709, USA. NR 13 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 0021-8979 J9 J APPL PHYS JI J. Appl. Phys. PD NOV 1 PY 1991 VL 70 IS 9 BP 4784 EP 4789 DI 10.1063/1.349071 PG 6 WC Physics, Applied SC Physics GA GN971 UT WOS:A1991GN97100016 ER PT J AU CULBERTSON, JC NEWMAN, HS STROM, U POND, JM CHRISEY, DB HORWITZ, JS WOLF, SA AF CULBERTSON, JC NEWMAN, HS STROM, U POND, JM CHRISEY, DB HORWITZ, JS WOLF, SA TI LIGHT DETECTION USING HIGH-TC MICROSTRIP TRANSMISSION-LINES AS A PROBE OF FILM HOMOGENEITY SO JOURNAL OF APPLIED PHYSICS LA English DT Article AB We have studied the effects of light on high-temperature superconductor microstrip transmission lines under conditions for which a bolometric photoresponse is expected. We illustrate the pitfall of comparing a spatially local property (such as microwave detected photoresponse) and a global property (such as microwave transmission), and then drawing conclusions regarding the bolometric character of the photoresponse. For low microwave powers, the photoresponse, measured as function of the position of the spot illuminated, provides a measurement of the spatial inhomogeneity of the microwave properties of the film. For microwave powers large enough to depress the critical temperature, such measurements provide information about standing waves in the microstrip. RP CULBERTSON, JC (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. RI Wolf, Stuart/A-7513-2009 NR 10 TC 3 Z9 3 U1 0 U2 0 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0021-8979 J9 J APPL PHYS JI J. Appl. Phys. PD NOV 1 PY 1991 VL 70 IS 9 BP 4995 EP 4999 DI 10.1063/1.349002 PG 5 WC Physics, Applied SC Physics GA GN971 UT WOS:A1991GN97100050 ER PT J AU GLESENER, JW MORRISH, AA SNAIL, KA AF GLESENER, JW MORRISH, AA SNAIL, KA TI A THIN-FILM SCHOTTKY DIODE FABRICATED FROM FLAME-GROWN DIAMOND SO JOURNAL OF APPLIED PHYSICS LA English DT Note ID BORON-DOPED DIAMOND AB Schottky diodes have been fabricated out of polycrystalline diamond thin films grown in an atmospheric pressure turbulent flame. Doping was accomplished by bubbling the source gas through a solution of diboric trioxide in acetone. The diodes were grown on metallic, noncrystalline substrates. A device fabrication technique utilizing carbide-forming refractory metals as a buffer layer was used to bond the diamond film to the substrate and act as an ohmic contact. The resulting structure avoided the difficulties in flame growth of working with thin detached films. Diode rectification ratios in excess of 300 were observed. RP GLESENER, JW (reprint author), USN,RES LAB,DIV OPT SCI,CODE 6522,WASHINGTON,DC 20375, USA. NR 8 TC 27 Z9 27 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 NOV 1 PY 1991 VL 70 IS 9 BP 5144 EP 5146 DI 10.1063/1.348992 PG 3 WC Physics, Applied SC Physics GA GN971 UT WOS:A1991GN97100081 ER PT J AU ROSCH, N ACKERMAN, L PACCHIONI, G DUNLAP, BI AF ROSCH, N ACKERMAN, L PACCHIONI, G DUNLAP, BI TI PARAMAGNETISM OF HIGH NUCLEARITY METAL CLUSTER COMPOUNDS AS DERIVED FROM LOCAL DENSITY FUNCTIONAL CALCULATIONS SO JOURNAL OF CHEMICAL PHYSICS LA English DT Letter ID PHYSICAL-PROPERTIES; CARBONYL CLUSTERS; NICKEL; MAGNETISM; SURFACES; MODELS C1 UNIV MILAN, CTR CNR, DIPARTIMENTO CHIM INORGAN & MET ORGAN, I-20133 MILAN, ITALY. USN, RES LAB, THEORET CHEM SECT, WASHINGTON, DC 20375 USA. RP TECH UNIV MUNICH, LEHRSTUHL THEORET CHEM, W-8046 GARCHING, GERMANY. RI Roesch, Notker/C-1182-2010; Pacchioni, Gianfranco/C-8529-2011; OI Pacchioni, Gianfranco/0000-0002-4749-0751; Dunlap, Brett/0000-0003-1356-6559 NR 18 TC 23 Z9 23 U1 0 U2 1 PU AMER INST PHYSICS PI MELVILLE PA 1305 WALT WHITMAN RD, STE 300, MELVILLE, NY 11747-4501 USA SN 0021-9606 EI 1089-7690 J9 J CHEM PHYS JI J. Chem. Phys. PD NOV 1 PY 1991 VL 95 IS 9 BP 7004 EP 7007 PG 4 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA GL753 UT WOS:A1991GL75300086 ER PT J AU GORMAN, MR AF GORMAN, MR TI ULTRASONIC POLAR BACKSCATTER IMAGING OF TRANSVERSE MATRIX CRACKS SO JOURNAL OF COMPOSITE MATERIALS LA English DT Article ID COMPOSITES AB Transverse matrix cracks in [0,90]s, [0,90(2)]s and [+/- 45]s graphite/epoxy laminates were imaged with a 15 MHz spherically focused transducer which was oriented at 27-degrees from the normal to the plane of the laminate and perpendicular to the fiber direction of the cracked ply. The backscattered signal from the micron wide cracks was two to five times stronger than the backscattered signal from the fibers. Polar backscatter C-scans of the coupon shaped specimens showed the cracks clearly enough to be counted up to a crack density of 8 per centimeter (20 cracks/inch). RP GORMAN, MR (reprint author), USN,POSTGRAD SCH,MONTEREY,CA 93943, USA. NR 8 TC 12 Z9 12 U1 0 U2 0 PU TECHNOMIC PUBL CO INC PI LANCASTER PA 851 NEW HOLLAND AVE, BOX 3535, LANCASTER, PA 17604 SN 0021-9983 J9 J COMPOS MATER JI J. Compos Mater. PD NOV PY 1991 VL 25 IS 11 BP 1499 EP 1514 PG 16 WC Materials Science, Composites SC Materials Science GA GX019 UT WOS:A1991GX01900007 ER PT J AU SWALCHICK, JM NOLAN, JF GOFF, WB AF SWALCHICK, JM NOLAN, JF GOFF, WB TI RENOCOLIC FISTULA WITH ABSCESS MASQUERADING AS A RENAL-CELL CARCINOMA - CT FINDINGS SO JOURNAL OF COMPUTER ASSISTED TOMOGRAPHY LA English DT Article C1 USN HOSP,DEPT RADIOL,SAN DIEGO,CA. RP SWALCHICK, JM (reprint author), USN HOSP,DEPT CLIN INVEST,SAN DIEGO,CA, USA. NR 8 TC 2 Z9 2 U1 0 U2 0 PU LIPPINCOTT-RAVEN PUBL PI PHILADELPHIA PA 227 EAST WASHINGTON SQ, PHILADELPHIA, PA 19106 SN 0363-8715 J9 J COMPUT ASSIST TOMO JI J. Comput. Assist. Tomogr. PD NOV-DEC PY 1991 VL 15 IS 6 BP 1072 EP 1073 DI 10.1097/00004728-199111000-00039 PG 2 WC Radiology, Nuclear Medicine & Medical Imaging SC Radiology, Nuclear Medicine & Medical Imaging GA GN911 UT WOS:A1991GN91100039 PM 1939765 ER PT J AU LO, JS PESCHEN, M SNOW, SN ORIBA, HA MOHS, FE AF LO, JS PESCHEN, M SNOW, SN ORIBA, HA MOHS, FE TI MALIGNANT CYLINDROMA OF THE SCALP SO JOURNAL OF DERMATOLOGIC SURGERY AND ONCOLOGY LA English DT Article ID DERMAL CYLINDROMA; TRANSFORMATION AB Malignant cylindroma may develop via malignant transformation of cylindroma in rare instances or may develop de novo in others. We present a case of malignant cylindroma located on the left parietal-occipital scalp that was treated twice by Mohs micrographic surgery in an attempt to excise the tumor completely and to minimize the excision of normal tissue. Our case is the sixteenth reported case of malignant cylindroma in the world literature. C1 UNIV WISCONSIN HOSP & CLIN,DEPT SURG,MOHS SURG CLIN,2880 UNIV AVE,MADISON,WI 53705. UNIV BONN,SCH MED,W-5300 BONN,GERMANY. USN HOSP,DEPT DERMATOL,SAN DIEGO,CA 92134. NR 20 TC 12 Z9 12 U1 0 U2 0 PU ELSEVIER SCIENCE INC PI NEW YORK PA 655 AVENUE OF THE AMERICAS, NEW YORK, NY 10010 SN 0148-0812 J9 J DERMATOL SURG ONC PD NOV PY 1991 VL 17 IS 11 BP 897 EP 901 PG 5 WC Oncology; Dermatology; Surgery SC Oncology; Dermatology; Surgery GA GQ063 UT WOS:A1991GQ06300009 PM 1661755 ER PT J AU KENNY, JJ OCONNELL, C SIECKMANN, DG FISCHER, RT LONGO, DL AF KENNY, JJ OCONNELL, C SIECKMANN, DG FISCHER, RT LONGO, DL TI SELECTION OF ANTIGEN-SPECIFIC, IDIOTYPE-POSITIVE B-CELLS IN TRANSGENIC MICE EXPRESSING A REARRANGED M167-MU HEAVY-CHAIN GENE SO JOURNAL OF EXPERIMENTAL MEDICINE LA English DT Article ID IMMUNE-RESPONSE; SOMATIC MUTATION; ANTIBODY-RESPONSE; REGION GENES; ADULT MICE; PHOSPHORYLCHOLINE; PHOSPHOCHOLINE; REPERTOIRE; MOUSE; DIVERSITY AB Flow cytometric analysis of antigen-specific, idiotype-positive (id+), B cell development in transgenic mice expressing a rearranged M167-mu-gene shows that large numbers of phosphocholine (PC)-specific, M167-id+ B cells develop in the spleen and bone marrow of these mice. Random rearrangement of endogenous V-kappa-genes, in the absence of a subsequent receptor-driven selection, should give rise to equal numbers of T15- and M167-id+ B cells. The observed 100-500-fold amplification of M167-id+ B cells expressing an endogenous encoded V-kappa-24J-kappa-5 light chain in association with the M167 V(H)1-id transgene product appears to be an antigen driven, receptor-mediated process, since no amplification of non-PC-binding M167 V(H)1/V-kappa-22, T15-id+ B cells occurs in these mu-only transgenic mice. The selection and amplification of antigen-specific, M167-id+ B cells requires surface expression of the mu-transgene product; thus, no enhancement of M167-id+ B cells occurs in the M167-mu-DELTA-mem-transgenic mice, which cannot insert the mu-transgene product into the B cell membrane. Surprisingly, no selection of PC-specific B cells occurs in M167-kappa-transgenic mice although large numbers of B cells expressing a crossreactive M167-id are present in the spleen and bone marrow of these mice. The failure to develop detectable numbers of M167-id+, PC-specific B cells in M167-kappa-transgenic mice may be due to a very low frequency of M167-V(H)-region formation during endogenous rearrangement of V(H)1 to D-J(H) segments. The somatic generation of the M167 version of a rearranged V(H)1 gene may occur in less than one of every 105 bone marrow B cells, and a 500-fold amplification of this M167-Id+ B cell would not be detectable by flow cytometry even though the anti-PC antibody produced by these B cells is detectable in the serum of M167-kappa-transgenic mice after immunization with PC. C1 USN,MED RES INST,BETHESDA,MD 20814. NCI,FREDERICK CANC RES & DEV CTR,BIOL RESPONSE MODIFIERS PROGRAM,FREDERICK,MD 21702. RP KENNY, JJ (reprint author), NCI,FREDERICK CANC RES & DEV CTR,PROGRAM RESOURCES INC DYNCORP,POB B,BLDG 567,RM 227,FREDERICK,MD 21702, USA. FU NCI NIH HHS [N01-CO-74102] NR 56 TC 22 Z9 22 U1 0 U2 0 PU ROCKEFELLER UNIV PRESS PI NEW YORK PA 222 E 70TH STREET, NEW YORK, NY 10021 SN 0022-1007 J9 J EXP MED JI J. Exp. Med. PD NOV 1 PY 1991 VL 174 IS 5 BP 1189 EP 1201 DI 10.1084/jem.174.5.1189 PG 13 WC Immunology; Medicine, Research & Experimental SC Immunology; Research & Experimental Medicine GA GM803 UT WOS:A1991GM80300024 PM 1940797 ER PT J AU SALDANA, MJ CHOBAN, S WESTERBECK, P SCHACHERER, TG AF SALDANA, MJ CHOBAN, S WESTERBECK, P SCHACHERER, TG TI RESULTS OF ACUTE ZONE-III EXTENSOR TENDON INJURIES TREATED WITH DYNAMIC EXTENSION SPLINTING SO JOURNAL OF HAND SURGERY-AMERICAN VOLUME LA English DT Article AB Motivated by the favorable results of dynamic splinting in the treatment of more proximal extensor tendon injuries, we explored the use of dynamic splinting in the treatment of zone III extensor tendon lacerations. Twenty-two tendon repairs in 19 patients were available for review. On the basis of degree of extension lag and pulp-to-palm distance, 14 repairs were rated as excellent, 6 as good, and 2 as fair. Using total active motion at 10 weeks, the proximal interphalangeal and distal interphalangeal joints averaged 170 degrees. There was one mild boutonniere deformity. The results of this prospective study show that carefully monitored dynamic splinting is safe in the treatment of zone III lacerations. When results were compared with the results of our method of static splinting used prior to this prospective study, patients returned to full activities with good-to-excellent results 8 weeks earlier instead of at 16 to 18 weeks. RP SALDANA, MJ (reprint author), USN HOSP,DEPT ORTHOPED,DIV HAND SURG,PORTSMOUTH,VA 23708, USA. NR 0 TC 11 Z9 11 U1 0 U2 0 PU CHURCHILL LIVINGSTONE INC MEDICAL PUBLISHERS PI NEW YORK PA 650 AVENUE OF THE AMERICAS, NEW YORK, NY 10011 SN 0363-5023 J9 J HAND SURG-AM JI J. Hand Surg.-Am. Vol. PD NOV PY 1991 VL 16A IS 6 BP 1145 EP 1150 PG 6 WC Orthopedics; Surgery SC Orthopedics; Surgery GA GP180 UT WOS:A1991GP18000029 PM 1748764 ER PT J AU FISCHER, JW NISSAN, RA LOWEMA, CK AF FISCHER, JW NISSAN, RA LOWEMA, CK TI SYNTHESIS OF 4,8-DISUBSTITUTED 4H,8H-BIS[1,2,5]OXADIAZOLO[3,4-B-3',4'-E]PYRAZINES SO JOURNAL OF HETEROCYCLIC CHEMISTRY LA English DT Article AB The dilithio anion of 3,4-N,N'-disubstituted diamino[1,2,5]oxadiazole (4a R = benzyl, 4b R = p-methoxybenzyl, 4c R = isopropyl) and cyanogen oxide gave 4,7-disubstituted 5,6-dioximino[1,2,5]oxadiazolo[3,4-b]-pyrazines 5a,b,c. Ring closure to the title compound 1 was accomplished upon heating 5 with sodium hydroxide in ethylene glycol at 150-degrees. RP FISCHER, JW (reprint author), USN,CTR WEAPONS,RES DEPT,DIV CHEM,CHINA LAKE,CA 93555, USA. NR 10 TC 13 Z9 13 U1 0 U2 1 PU HETERO CORPORATION PI TAMPA PA BOX 20285, TAMPA, FL 33622-0285 SN 0022-152X J9 J HETEROCYCLIC CHEM JI J. Heterocycl. Chem. PD NOV PY 1991 VL 28 IS 7 BP 1677 EP 1681 PG 5 WC Chemistry, Organic SC Chemistry GA HU847 UT WOS:A1991HU84700006 ER PT J AU LITTLE, B WAGNER, P RAY, R POPE, R SCHEETZ, R AF LITTLE, B WAGNER, P RAY, R POPE, R SCHEETZ, R TI BIOFILMS - AN ESEM EVALUATION OF ARTIFACTS INTRODUCED DURING SEM PREPARATION SO JOURNAL OF INDUSTRIAL MICROBIOLOGY LA English DT Review DE BIOFILM; SCANNING ELECTRON MICROSCOPE; ENVIRONMENTAL SCANNING ELECTRON MICROSCOPE ID INDUCED CORROSION; SURFACES; COAL AB Descriptions of biofilms and their elemental compositions based on scanning electron micrographs and energy dispersive x-ray analysis cannot be related to the original condition of the biofilm on the surface. Solvent replacement of water removes extracellular polymeric material and reduces the concentration of elements bound within the biofilm. In the wet state, bacteria and microalgae are enmeshed in a gelatinous film that is either removed or dried to a thin inconspicuous residue during sample preparation for scanning electron microscopy. The environmental scanning electron microscope provides a fast, accurate image of biofilms, their spatial relationship to the substratum and elemental composition. C1 UNIV SO MISSISSIPPI,DEPT BIOL SCI,HATTIESBURG,MS 39406. RP LITTLE, B (reprint author), USN,OCEANOG & ATMOSPHER RES LAB,STENNIS SPACE CTR,MS, USA. NR 46 TC 92 Z9 96 U1 0 U2 16 PU STOCKTON PRESS PI BASINGSTOKE PA HOUNDMILLS, BASINGSTOKE, HAMPSHIRE, ENGLAND RG21 6XS SN 0169-4146 J9 J IND MICROBIOL JI J. Indust. Microbiol. PD NOV PY 1991 VL 8 IS 4 BP 213 EP 221 DI 10.1007/BF01576058 PG 9 WC Biotechnology & Applied Microbiology SC Biotechnology & Applied Microbiology GA GT686 UT WOS:A1991GT68600001 ER PT J AU GANG, H CUOMO, FW AF GANG, H CUOMO, FW TI DISPLACEMENT RESPONSE, DETECTION LIMIT, AND DYNAMIC-RANGE OF FIBEROPTIC LEVER SENSORS SO JOURNAL OF LIGHTWAVE TECHNOLOGY LA English DT Article ID HYDROPHONE; TRANSDUCER; PRESSURE AB The theory for sensor response, detection limit, and dynamic range of fiber-optic lever sensors has been developed in a general form to characterize the sensor displacement detection ability. The formulations for the normalized reflected optical power change are derived to provide a new approach in the evaluation of the optimal sensor response, the linearity range, and the minimum detectable displacement. The theoretical models are verified by an experiment which determines sensor response, modulation index, reflected optical power change, and linear response range through dynamic measurement. The application of this theoretical model to the study of the fiber-optic microphone has provided a method to determine its acoustic pressure measurement ability and the comparison with other techniques. Further application of the theory is also discussed. C1 USN,CTR UNDERWATER SYST,NEWPORT,RI 02841. RP GANG, H (reprint author), UNIV RHODE ISL,DEPT PHYS,KINGSTON,RI 02881, USA. NR 26 TC 19 Z9 19 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 0733-8724 J9 J LIGHTWAVE TECHNOL JI J. Lightwave Technol. PD NOV PY 1991 VL 9 IS 11 BP 1618 EP 1625 DI 10.1109/50.97654 PG 8 WC Engineering, Electrical & Electronic; Optics; Telecommunications SC Engineering; Optics; Telecommunications GA GL728 UT WOS:A1991GL72800026 ER PT J AU KOON, NC WILLIAMS, CM DAS, BN AF KOON, NC WILLIAMS, CM DAS, BN TI GIANT MAGNETOSTRICTION MATERIALS SO JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS LA English DT Article ID CUBIC LAVES COMPOUNDS; MAGNETIC-ANISOTROPY; SPIN ROTATIONS; HOXTB1-XFE2 AB One of the significant technical developments in magnetism of the early 1970's was the discovery of a new class of rare earth intermetallic compounds, the RFe2 Laves phases, which were found to exhibit room temperature magnetostrictive strains approaching 2 x 10(-3), an order of magnitude larger than any previously known. Since that time both the fundamental and technical properties of these materials have been of intense interest, and they remain the subject of active research even today. The large strains available are useful in such applications as production of high amplitude, low frequency sound waves in water, certain types of strain gages, vibration compensation and compensation for temperature induced strains in large laser mirrors. Because the performance of these materials depends critically on such fundamental properties as the magnetic anisotropy, magnetization and grain orientation of the material, there has been a very strong interplay between fundamental studies and applications. In this article we briefly review the fundamental magnetic and magnetostrictive properties of the RFe2 Laves phases, focusing especially on the complex behavior of the anisotropy and the success of crystal field theory in explaining it. We also present neutron measurements of magnetic excitation spectra and explain how they provide an understanding of the remarkable success of mean field theory for these systems. RP KOON, NC (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 30 TC 117 Z9 119 U1 4 U2 24 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0304-8853 J9 J MAGN MAGN MATER JI J. Magn. Magn. Mater. PD NOV PY 1991 VL 100 IS 1-3 BP 173 EP 185 DI 10.1016/0304-8853(91)90819-V PG 13 WC Materials Science, Multidisciplinary; Physics, Condensed Matter SC Materials Science; Physics GA GX179 UT WOS:A1991GX17900012 ER PT J AU PRINZ, GA AF PRINZ, GA TI METASTABILITY IN EPITAXIAL MAGNETIC METAL-FILMS SO JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS LA English DT Article ID CENTERED-TETRAGONAL COPPER; FCC IRON FILMS; COBALT FILMS; THIN-FILMS; GAMMA-FE; GROWTH; SUPERLATTICES; GAAS; BCC; MN AB A brief review is provided which assesses the current status of the study of metastable phases of magnetic 3-d metals as epitaxial films on single crystal substrates. Three systems which have the largest literature are discussed in detail: fcc-gamma-Fe on Cu, fcc-beta-Co on Cu and bcc Co on GaAs. RP PRINZ, GA (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 64 TC 66 Z9 67 U1 0 U2 6 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0304-8853 J9 J MAGN MAGN MATER JI J. Magn. Magn. Mater. PD NOV PY 1991 VL 100 IS 1-3 BP 469 EP 480 DI 10.1016/0304-8853(91)90835-X PG 12 WC Materials Science, Multidisciplinary; Physics, Condensed Matter SC Materials Science; Physics GA GX179 UT WOS:A1991GX17900028 ER PT J AU HINTON, DB JORDAN, AK KLAUS, M SHAW, JK AF HINTON, DB JORDAN, AK KLAUS, M SHAW, JK TI INVERSE SCATTERING ON THE LINE FOR A DIRAC SYSTEM SO JOURNAL OF MATHEMATICAL PHYSICS LA English DT Article AB The whole-line version of the Gelfand-Levitan-Marchenko (GLM) equation for a Dirac system is studied. A new derivation of the GLM equation is given, under weaker hypotheses than Frolov's earlier treatment [Sov. Math. Dok1. 13, 1468 (1972)], and the complete inversion is carried out in some explicit cases in which a spectral gap is present. Previous calculations of this type are restricted either to a scalar potential or degenerate gap. Applications are discussed in connection with optical couplers and soliton equations. C1 USN,RES LAB,CTR ADV SPACE SENSING,WASHINGTON,DC 20375. VIRGINIA TECH,DEPT MATH,BLACKSBURG,VA 24061. RP HINTON, DB (reprint author), UNIV TENNESSEE,DEPT MATH,KNOXVILLE,TN 37996, USA. NR 28 TC 28 Z9 28 U1 0 U2 2 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0022-2488 J9 J MATH PHYS JI J. Math. Phys. PD NOV PY 1991 VL 32 IS 11 BP 3015 EP 3030 DI 10.1063/1.529046 PG 16 WC Physics, Mathematical SC Physics GA GL513 UT WOS:A1991GL51300012 ER PT J AU DUTT, DA HIGBY, PL MERZBACHER, CI GRISCOM, DL AF DUTT, DA HIGBY, PL MERZBACHER, CI GRISCOM, DL TI COMPOSITIONAL DEPENDENCE OF TRAPPED HOLE-CENTERS IN GAMMA-IRRADIATED CALCIUM ALUMINOSILICATE GLASSES SO JOURNAL OF NON-CRYSTALLINE SOLIDS LA English DT Article ID ALUMINATE GLASSES; DOPANT-FREE; SI-29; RESONANCE; MECHANISM; SYSTEM AB The electron spin resonance (ESR) spectra of a series of gamma-irradiated calcium aluminosilicate glasses with compositions CaO/Al2O3 = 1.50 and 0-80 mol% SiO2 have been measured at 9.3 GHz. The ESR spectra have been analyzed using spin-Hamiltonian parameters previously attributed to aluminum- and silicon-associated hole centers. Defect concentrations calculated from computer lineshape simulations based on the spin-Hamiltonian parameters are analyzed in terms of proposed defect precursor structures and a simple tetrahedral coordination model. RP DUTT, DA (reprint author), USN,RES LAB,OPT MAT RES GRP,WASHINGTON,DC 20375, USA. NR 28 TC 7 Z9 7 U1 0 U2 7 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0022-3093 J9 J NON-CRYST SOLIDS JI J. Non-Cryst. Solids PD NOV PY 1991 VL 135 IS 2-3 BP 122 EP 130 DI 10.1016/0022-3093(91)90412-Y PG 9 WC Materials Science, Ceramics; Materials Science, Multidisciplinary SC Materials Science GA GT308 UT WOS:A1991GT30800004 ER PT J AU FLANARY, DB TWOHEY, SM GRAY, JL MELLONIG, JT GHER, ME AF FLANARY, DB TWOHEY, SM GRAY, JL MELLONIG, JT GHER, ME TI THE USE OF A SYNTHETIC SKIN SUBSTITUTE AS A PHYSICAL BARRIER TO ENHANCE HEALING IN HUMAN PERIODONTAL FURCATION DEFECTS - A FOLLOW-UP REPORT SO JOURNAL OF PERIODONTOLOGY LA English DT Article DE WOUND HEALING; GUIDED TISSUE REGENERATION; PERIODONTITIS THERAPY; FURCATION THERAPY; PERIODONTAL DRESSINGS ID GUIDED TISSUE REGENERATION; ATTACHMENT FORMATION; CONNECTIVE-TISSUE; CITRIC-ACID; HISTOLOGIC EVALUATION; BEAGLE DOGS; LIGAMENT; DISEASE; ROOTS AB THE PURPOSE OF THIS INVESTIGATION is to compare the clinical response of guided tissue regeneration using a synthetic wound dressing with open flap debridement versus open flap debridement alone in the treatment of human furcation defects. The study group was composed of 19 patients with moderate to advanced adult periodontitis and at least one bilateral pair of Class II molar furcation defects. After the hygiene phase of therapy was completed, measurements were made with calibrated periodontal probes of the clinical attachment levels, probing depths, and soft tissue recession. Paired sites were randomly selected for treatment with either open flap debridement alone (control) or open flap debridement and placement of the synthetic wound dressing over the furcation (experimental). At the time of surgery, measurements of vertical and horizontal open probing attachment were recorded. The dressing was removed 5 to 6 weeks post-surgery. The sites were reentered at 6 months to evaluate healing and to repeat all measurements. Statistical comparisons using the Wilcoxon Sign Rank Test were made between the control and experimental sites. The results of 19 pairs of Class II molar furcation defects reveal statistically significant differences between the experimental and control sites in attachment levels, probing depths, and horizontal open probing attachment. These differences were of such small magnitude that they may not be clinically relevant. There were no other significant differences for any other clinical parameter, and none of the furcations in either group was completely closed. In conclusion, the synthetic wound dressing as used in this study in comparison with open flap debridement showed a small, but statistically significant, improvement in attachment levels and horizontal probing of Class II molar furcation defects. C1 USN HOSP,DEPT DENT,SAN DIEGO,CA 92134. RP FLANARY, DB (reprint author), USN,SCH DENT,NATL NAVAL DENT CTR,BETHESDA,MD 20889, USA. NR 35 TC 12 Z9 12 U1 0 U2 1 PU AMER ACAD PERIODONTOLOGY PI CHICAGO PA 737 NORTH MICHIGAN AVENUE, SUITE 800, CHICAGO, IL 60611-2690 SN 0022-3492 J9 J PERIODONTOL JI J. Periodont. PD NOV PY 1991 VL 62 IS 11 BP 684 EP 689 PG 6 WC Dentistry, Oral Surgery & Medicine SC Dentistry, Oral Surgery & Medicine GA GR297 UT WOS:A1991GR29700007 PM 1753321 ER PT J AU BOWERS, G FELTON, F MIDDLETON, C GLYNN, D SHARP, S MELLONIG, J CORIO, R EMERSON, J PARK, S SUZUKI, J MA, S ROMBERG, E REDDI, AH AF BOWERS, G FELTON, F MIDDLETON, C GLYNN, D SHARP, S MELLONIG, J CORIO, R EMERSON, J PARK, S SUZUKI, J MA, S ROMBERG, E REDDI, AH TI HISTOLOGIC COMPARISON OF REGENERATION IN HUMAN INTRABONY DEFECTS WHEN OSTEOGENIN IS COMBINED WITH DEMINERALIZED FREEZE-DRIED BONE ALLOGRAFT AND WITH PURIFIED BOVINE COLLAGEN SO JOURNAL OF PERIODONTOLOGY LA English DT Article DE BONE REGENERATION; OSTEOGENESIS; GRAFTS; FREEZE-DRIED BONE; OSTEOGENIN; COLLAGEN ID ATTACHMENT APPARATUS FORMATION; EXTRACELLULAR-MATRIX; ROOT RESORPTION; DIFFERENTIATION AB A BONE-INDUCTIVE PROTEIN, OSTEOGENIN, has been isolated from long bones of humans and offers promise as a grafting material. Studies, however, suggest that osteogenin must be combined with a bone-derived matrix in order to initiate bone differentiation. The purpose of this study was to determine if osteogenin combined with demineralized freeze dried bone allograft (DFDBA), a bone-derived matrix, and with a bovine tendon-derived matrix will enhance regeneration of intrabony defects in humans. The tendon-derived maxtrix and DFDBA used alone served as controls. The ability of each material to form a new attachment apparatus was evaluated independently in submerged and nonsubmerged environments in 2 patient populations. Lymphocyte testing was performed to assess development of an immune reaction to osteogenin. The most apical level of calculus on the root served as the histologic reference point to measure regeneration. Biopsies were obtained at 6 months and regeneration was measured histomorphometrically by 2 blinded evaluators. Serial sections from 36 submerged defects in 8 patients and 50 nonsubmerged defects in 6 patients were submitted for statistical analysis. Mean results indicate that osteogenin combined with DFDBA significantly enhanced regeneration of a new attachment apparatus and component tissues in a submerged environment. DFDBA plus osteogenin and DFDBA alone formed significantly more new attachment apparatus and component tissues than either the tendon-derived matrix plus osteogenin or the tendon-derived matrix alone in both submerged and nonsubmerged environments. There were no significant differences between the tendon-derived matrix plus osteogenin and the tendon-derived matrix alone in either the submerged or nonsubmerged environment. Osteogenin does not impair normal lymphocyte blastogenesis at 6 months post-surgical challenge. C1 USN,BEAUFORT,SC. USN,DENT CLIN,MIAMI,FL. JOHNS HOPKINS UNIV,SCH MED,DEPT DERMATOPATHOL & ORAL PATHOL,BALTIMORE,MD 21205. UNIV TEXAS,HLTH SCI CTR,DEPT PERIODONT,SAN ANTONIO,TX 78284. RP BOWERS, G (reprint author), UNIV MARYLAND,BALTIMORE COLL DENT SURG,DEPT PERIODONT,666 W BALTIMORE ST,BALTIMORE,MD 21201, USA. FU NIDCR NIH HHS [DE-07204] NR 20 TC 101 Z9 104 U1 0 U2 1 PU AMER ACAD PERIODONTOLOGY PI CHICAGO PA 737 NORTH MICHIGAN AVENUE, SUITE 800, CHICAGO, IL 60611-2690 SN 0022-3492 J9 J PERIODONTOL JI J. Periodont. PD NOV PY 1991 VL 62 IS 11 BP 690 EP 702 PG 13 WC Dentistry, Oral Surgery & Medicine SC Dentistry, Oral Surgery & Medicine GA GR297 UT WOS:A1991GR29700008 PM 1753322 ER PT J AU NGAI, KL YEE, AF AF NGAI, KL YEE, AF TI SOME CONNECTIONS BETWEEN VISCOELASTIC PROPERTIES OF PVC AND PLASTICIZED PVC AND MOLECULAR KINETICS SO JOURNAL OF POLYMER SCIENCE PART B-POLYMER PHYSICS LA English DT Article DE POLY(VINYL CHLORIDE), VISCOELASTICITY AND MOLECULAR KINETICS OF; PLASTICIZED PVC, MOLECULAR KINETICS AND VISCOELASTICITY OF; VISCOELASTICITY OF PVC RELATED TO MOLECULAR KINETICS ID UNIFIED RELAXATION MODEL; DIELECTRIC-RELAXATION; AMORPHOUS POLYMERS; POLYVINYL ACETATE); GLASS TEMPERATURE; COUPLING MODEL; DYNAMICS; POLYSTYRENE; MOTION AB A coupling model that has been shown in the past to be capable of relating macroscopically measured relaxation parameters to molecular ones has been presented. In this article the coupling model is applied to the analysis of stress relaxation data collected by Cama and Sternstein on PVC and plasticized PVC. The Kohlrausch-Williams-Watts form, exp - (t/tau*)1-n, using n = 0.77 is found to be capable of describing the stress relaxation master curve at temperatures below the glass transition T(g). From the temperature-independent apparent activation energy found by Cama and Sternstein, the primitive activation energy of the alpha-relaxation was calculated to be 7.5 kcal/mol, which is a reasonable value for the energy barrier to internal rotational isomerism in PVC. Support for this value is found from the data on two plasticized PVCs with different T(g)s and apparent activation energies. By applying the coupling model in a similar manner, the primitive activation energies were found to be 8.5 kcal/mol for PVC plasticized with 6 pph dioctylphthalate and 7.7 kcal/mol for PVC plasticized with 6 pph tricresyl phosphate. Within experimental uncertainties, the three primitive activation energies can be considered to be the same. This finding is consistent with the physical basis for primitive activation energy and its identification with the internal rotation barrier, which should be independent of the type and amount of plasticizer in the system. Analysis of Cama and Sternstein's data on the effect of repeated stress aging on stress relaxation of quenched samples of PVC and plasticized PVC show that the coupling constant n increases systematically with each successive stress-aging cycle until it approaches the value for slow-cooled samples. These results are consistent with the notion that stress-aging changes the structural state of the glass in ways similar to physical aging. C1 UNIV MICHIGAN,DEPT MAT SCI & ENGN,ANN ARBOR,MI 48109. RP NGAI, KL (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. RI Yee, Albert/E-5398-2010 OI Yee, Albert/0000-0002-5762-6042 NR 26 TC 30 Z9 30 U1 1 U2 12 PU JOHN WILEY & SONS INC PI NEW YORK PA 605 THIRD AVE, NEW YORK, NY 10158-0012 SN 0887-6266 J9 J POLYM SCI POL PHYS JI J. Polym. Sci. Pt. B-Polym. Phys. PD NOV PY 1991 VL 29 IS 12 BP 1493 EP 1501 DI 10.1002/polb.1991.090291206 PG 9 WC Polymer Science SC Polymer Science GA GL037 UT WOS:A1991GL03700006 ER PT J AU AJDARI, E GUTMARK, E PARR, TP WILSON, KJ SCHADOW, KC AF AJDARI, E GUTMARK, E PARR, TP WILSON, KJ SCHADOW, KC TI THERMAL IMAGING OF AFTERBURNING PLUMES SO JOURNAL OF PROPULSION AND POWER LA English DT Article ID JETS AB Afterburning and nonafterburning exhaust plumes were studied experimentally for underexpanded sonic and supersonic conical circular nozzles. The plume structure was visualized using thermal imaging and regular photography. Thermal emission by the plume is mainly dependent on the presence of afterburning. Temperature and reducing power (or unoxidized fuel content) of the exhaust gases, in addition to the nozzle configuration, determine the structure of the plume core, the location where the afterburning is initiated, its size, and intensity. The temperature, through chemical kinetics, determines the presence of afterburning and its initiation location. Its effect is especially critical in marginally afterburning plumes. The fuel content determines the size and intensity of the plume when afterburning occurs. Comparison between single shot and average thermal images of the plume show that afterburning is a highly turbulent combustion process. RP AJDARI, E (reprint author), USN,CTR WEAP,DEPT RES,CHINA LAKE,CA 93555, USA. NR 4 TC 3 Z9 3 U1 1 U2 1 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 NOV-DEC PY 1991 VL 7 IS 6 BP 873 EP 878 PG 6 WC Engineering, Aerospace SC Engineering GA GU117 UT WOS:A1991GU11700004 ER PT J AU COVINO, J HUDSON, FE AF COVINO, J HUDSON, FE TI CURRENT ASSESSMENT METHODOLOGY FOR ELECTROSTATIC DISCHARGE HAZARDS OF ENERGETIC MATERIALS SO JOURNAL OF PROPULSION AND POWER LA English DT Article AB The 1985 Pershing fire and other more recent incidents have renewed interest in the phenomenon of electrostatic discharge (ESD) in energetic materials as a mechanism for induced inadvertent ignition and sustained combustion. In recent years, ESD research has focused on developing experimental techniques to evaluate ESD hazards of energetic materials. In this paper, logic/protocol is described for assessing ESD sensitivity in energetic materials consisting of a calculation percolation coefficient and measurements of resistivity, dielectric constant, dielectric breakdown, and resistive-capacitive (R-C) discharge. Representative data on energetic and nonenergetic propellant formulations are presented and discussed. RP COVINO, J (reprint author), USN,CTR WEAP,CODE 3891,CHINA LAKE,CA 93555, USA. NR 22 TC 4 Z9 5 U1 0 U2 1 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 NOV-DEC PY 1991 VL 7 IS 6 BP 894 EP 903 DI 10.2514/3.23407 PG 10 WC Engineering, Aerospace SC Engineering GA GU117 UT WOS:A1991GU11700007 ER PT J AU WHITE, ME LEE, RE THOMPSON, MW CARPENTER, A YANTA, WJ AF WHITE, ME LEE, RE THOMPSON, MW CARPENTER, A YANTA, WJ TI TANGENTIAL MASS ADDITION FOR SHOCK BOUNDARY-LAYER INTERACTION CONTROL IN SCRAMJET INLETS SO JOURNAL OF PROPULSION AND POWER LA English DT Article AB A series of tests are being performed to investigate and characterize shock-wave/boundary-layer interactions typical of hypersonic inlets and to develop methods of controlling, through the use of tangential mass addition, regions of shock-induced separation. The major objectives are being accomplished in a multiphase experimental test program with complementary application of computational techniques. Presented herein are results from the proof-of-concept phase of testing. The feasibility of using Mach 3 tangential air injection to eliminate separation associated with the cowl-shock/innerbody boundary-layer interaction in a scramjet inlet model has been demonstrated. The experimental test program was complemented by a computational investigation that demonstrated the importance of mass addition injector location relative to the shock/boundary-layer interaction region. C1 USN,CTR SURFACE WARFARE,AERODYNAM BRANCH K24,WHITE OAK,MD 20903. RP WHITE, ME (reprint author), JOHNS HOPKINS UNIV,APPL PHYS LAB,DEPT AERONAUT,PROP GRP,LAUREL,MD 20723, USA. NR 29 TC 1 Z9 2 U1 0 U2 2 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 NOV-DEC PY 1991 VL 7 IS 6 BP 1023 EP 1029 DI 10.2514/3.23422 PG 7 WC Engineering, Aerospace SC Engineering GA GU117 UT WOS:A1991GU11700024 ER PT J AU LIN, TF GILBERT, JB ROY, GD AF LIN, TF GILBERT, JB ROY, GD TI ANALYSES OF MAGNETOHYDRODYNAMIC PROPULSION WITH SEAWATER FOR UNDERWATER VEHICLES SO JOURNAL OF PROPULSION AND POWER LA English DT Note C1 OFF NAVAL RES,ARLINGTON,VA 22217. RP LIN, TF (reprint author), PENN STATE UNIV,APPL RES LAB,STATE COLL,PA 16804, USA. NR 4 TC 4 Z9 4 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 NOV-DEC PY 1991 VL 7 IS 6 BP 1081 EP 1083 DI 10.2514/3.23433 PG 3 WC Engineering, Aerospace SC Engineering GA GU117 UT WOS:A1991GU11700035 ER PT J AU BIST, HD DATTA, T LITTLE, TS THIGPEN, JC DURIG, JR BROUSSARD, PR BERKLEY, DD AF BIST, HD DATTA, T LITTLE, TS THIGPEN, JC DURIG, JR BROUSSARD, PR BERKLEY, DD TI FOURIER-TRANSFORM RAMAN-SPECTROSCOPY OF SUPERCONDUCTING YBA2CU3O7-DELTA FILMS ON STRONTIUM-TITANATE AND MAGNESIUM-OXIDE SUBSTRATES SO JOURNAL OF RAMAN SPECTROSCOPY LA English DT Article ID CU-O; SCATTERING; CRYSTAL; PHONONS; MGO; SI AB Thin sputtered films of the high-T(c) material YBa2Cu3O7-delta were investigated using 180-degrees back-scattering geometry with Fourier transform (FT) Raman spectroscopy. It is established that the main bands in the spectra of a YBa2Cu3O7-delta film on strontium titanate substrate exhibit similarity with those obtained for oriented untwinned crystallites of the superconductor having their c-axis perpendicular to the surface of the substrate. No degradation or excessive heating of the film was observed with 1.064-mu-m excitation for low laser powers. The film on a magnesium oxide substrate gives unique evidence of the isolated strong, featureless, almost flat continuum, producing a broad maximum near the region of the antiphase axial bending O(2)-Cu(2)-O(3) motions of planar oxygens at very low excitation energy. This appears to be the first application of FT-Raman spectroscopy using near-infrared excitation (1.064-mu-m) to the field of high-temperature superconducting films and their detailed characterization. C1 UNIV S CAROLINA,DEPT CHEM,COLUMBIA,SC 29208. UNIV S CAROLINA,DEPT PHYS,COLUMBIA,SC 29208. USN,RES LAB,WASHINGTON,DC 20375. INDIAN INST TECHNOL,DEPT PHYS,KANPUR 20016,INDIA. INDIAN INST TECHNOL,CTR LASER TECHNOL,KANPUR 20016,INDIA. NR 21 TC 0 Z9 0 U1 0 U2 2 PU JOHN WILEY & SONS LTD PI W SUSSEX PA BAFFINS LANE CHICHESTER, W SUSSEX, ENGLAND PO19 1UD SN 0377-0486 J9 J RAMAN SPECTROSC JI J. Raman Spectrosc. PD NOV PY 1991 VL 22 IS 11 BP 639 EP 643 DI 10.1002/jrs.1250221108 PG 5 WC Spectroscopy SC Spectroscopy GA GQ888 UT WOS:A1991GQ88800007 ER PT J AU CHAUHAN, SP AF CHAUHAN, SP TI AMNIOTIC-FLUID INDEX BEFORE AND AFTER AMNIOINFUSION OF A FIXED VOLUME OF NORMAL SALINE SO JOURNAL OF REPRODUCTIVE MEDICINE LA English DT Article ID FETAL HEART-RATE; DECELERATIONS; RELIEF AB Twenty-one women at term, with an amniotic fluid index (AFI) less-than-or-equal-to 5.0 cm and intact membranes, underwent an artificial amniotomy and transcervical amnioinfusion of 250 mL of normal saline at room temperature. The mean (+/- SD) cervical dilation at the time of the transcervical amnioinfusion was 2.6 +/- 1.3 cm (range, 1-6). The mean AFI prior to the amnioinfusion was 3.0 +/- 1.49 cm (range, 0-4.7). The mean AFI after the amnioinfusion was 8.9 +/- 2.9 cm (range, 5.1-14.3). A mean change in the AFI of 5.8 +/- 2.6 cm (range, 0.9-10.6) was noted. Among patients with AFI less-than-or-equal-to 5.0 cm and intact membranes, amnioinfusion of 250 mL of normal saline seems to be a safe and simple way to increase the AFI to > 5.0 cm. RP CHAUHAN, SP (reprint author), USN HOSP,DEPT OBSTET & GYNECOL,PORTSMOUTH,VA 23708, USA. NR 8 TC 14 Z9 14 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 NOV PY 1991 VL 36 IS 11 BP 801 EP 802 PG 2 WC Obstetrics & Gynecology SC Obstetrics & Gynecology GA GR584 UT WOS:A1991GR58400010 PM 1765958 ER PT J AU FERRITTO, JM AF FERRITTO, JM TI STUDIES ON SEISMIC ISOLATION OF BUILDINGS SO JOURNAL OF STRUCTURAL ENGINEERING-ASCE LA English DT Article AB This paper has studied the applicability of base isolation to structures. The Navy is evaluating the potential use of base isolation for essential structures that must remain functional in a postearthquake environment. The paper reviews preliminary building-selection criteria and structural design criteria. For low-rise regular-frame construction situated on a rock or stiff site and housing-sensitive equipment, base isolation of the columns offers the potential for significant damage reduction. The paper presents a comparison of analysis techniques treating the isolator as a nonlinear hysteretic element and as linear elements with and without nodal damping. The results indicate that for the case studied, significant differences in displacement and drift result while moments vary by about 10%. Vertical acceleration effects were found to cause an increase in maximum moment by about 15%. RP FERRITTO, JM (reprint author), USN,CIV ENGN LAB,CODE L51,PORT HUENEME,CA 93043, USA. NR 5 TC 2 Z9 2 U1 0 U2 2 PU ASCE-AMER SOC CIVIL ENG PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2398 SN 0733-9445 J9 J STRUCT ENG-ASCE JI J. Struct. Eng.-ASCE PD NOV PY 1991 VL 117 IS 11 BP 3293 EP 3314 DI 10.1061/(ASCE)0733-9445(1991)117:11(3293) PG 22 WC Construction & Building Technology; Engineering, Civil SC Construction & Building Technology; Engineering GA GL643 UT WOS:A1991GL64300007 ER PT J AU GAUNAURD, GC WERBY, MF AF GAUNAURD, GC WERBY, MF TI SOUND SCATTERING BY RESONANTLY EXCITED, FLUID-LOADED, ELASTIC SPHERICAL-SHELLS SO JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA LA English DT Article ID ACOUSTIC SCATTERING; ECHOES AB The scattering of sound waves by an air-filled, elastic, spherical shell in deep waters, in the frequency domain is analyzed. This exact analysis is based on the classical formulation of three-dimensional elastodynamics, for fluid-loaded spherical shells of arbitrary thickness. Form functions, residual responses, and the partial-wave expansions of both, are determined. Results are displayed in relatively wide frequency bands for various increasing shell thicknesses. The resonance features in the sonar cross sections (SCS) are isolated by means of a new hybrid modal background that substantially improves the results found with the earlier (rigid/soft) backgrounds of the resonance scattering theory (RST). The resonance features in the SCSs that correspond to each mode, and also to each of the various shell waves that propagate around its periphery are isolated. There seem to be over half-a-dozen shell (generalized Lamb and Stoneley) waves manifesting their influence in the SCSs within the examined band. Three large-amplitude features are most noticeable. There is a (slow) wave due to the double curvature of the shell which is responsible for a large, spiky feature at low frequencies. There is the spherical A(O) wave, caused by the coincidence effect, responsible for a broad ''bump'' with superimposed spikes, which appears in the midfrequency region, near x approximately (h')-1, where h' is the relative shell thickness. There is also a thickness resonance feature at high frequencies, which is due to a wave that propagates through the shell thickness at the incidence point. There is a spherical Stoneley-type wave that resides mostly in the water in the frequency region below coincidence, x(c), at which the A(O) wave is activated. Finally, there are two resonance families caused by spherical analogs of the symmetric, S(n), and the antisymmetric, A(n), Lamb waves originally studied in flat plates. These spherical generalizations are denoted by the same symbols S(n), A(n), with the understanding that they now refer to shells. This model's results for phase velocities, cutoff frequencies, etc..., are compared to those produced by simpler approaches in order to size the approximations introduced by those simpler models. This serves to establish the benchmark nature of the present model and of the calculations it produces, which are displayed in many instances. Dispersion plots are generated for the phase velocities c(p)(x) of all the above-mentioned shell waves. These c(p)(x) are proportional to the (real parts of the) roots of determinantal conditions that are also analyzed. Critical angles, coincidence phenomena, and reflection and transmission properties of the shell are examined and all the required physical interpretations are given. C1 NAVAL OCEAN & ATMOSPHER RES LAB CODE 221,DIV NUMER MODELING,BAY ST LOUIS,MS 39524. RP GAUNAURD, GC (reprint author), NAVAL SURFACE WARFARE CTR,RES DEPT R42,SILVER SPRING,MD 20903, USA. NR 28 TC 48 Z9 50 U1 1 U2 8 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 NOV PY 1991 VL 90 IS 5 BP 2536 EP 2550 DI 10.1121/1.402059 PG 15 WC Acoustics; Audiology & Speech-Language Pathology SC Acoustics; Audiology & Speech-Language Pathology GA GN734 UT WOS:A1991GN73400017 ER PT J AU ZIOLA, SM GORMAN, MR AF ZIOLA, SM GORMAN, MR TI SOURCE LOCATION IN THIN PLATES USING CROSS-CORRELATION SO JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA LA English DT Article AB In this paper an alternative method to first threshold crossing for acoustic emission (AE) source location is presented. For wave propagation in dispersive media, the accuracy of source location can be improved by locating corresponding phase points on the transducer outputs to determine the difference in arrival times. The phase point location was done by cross-correlating the transducer outputs with a single frequency cosine wave modulated by a Gaussian pulse. Experiments were performed using a lead break as the AE source on the surface of an aluminum plate. Due to the plate geometry and source orientation, the wave produced was highly dispersive. Although this wave was unsuitable for first threshold crossing techniques, the time differences needed for triangulation could be determined using the cross-correlation technique. RP NAVAL POSTGRAD SCH, MONTEREY, CA 93943 USA. NR 11 TC 116 Z9 119 U1 1 U2 16 PU ACOUSTICAL SOC AMER AMER INST PHYSICS PI MELVILLE PA STE 1 NO 1, 2 HUNTINGTON QUADRANGLE, MELVILLE, NY 11747-4502 USA SN 0001-4966 EI 1520-8524 J9 J ACOUST SOC AM JI J. Acoust. Soc. Am. PD NOV PY 1991 VL 90 IS 5 BP 2551 EP 2556 DI 10.1121/1.402348 PG 6 WC Acoustics; Audiology & Speech-Language Pathology SC Acoustics; Audiology & Speech-Language Pathology GA GN734 UT WOS:A1991GN73400018 ER PT J AU HEANEY, KD KUPERMAN, WA MCDONALD, BE AF HEANEY, KD KUPERMAN, WA MCDONALD, BE TI PERTH-BERMUDA SOUND-PROPAGATION (1960) - ADIABATIC MODE INTERPRETATION SO JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA LA English DT Article ID AUSTRALIA AB A 1960 experiment is examined in which sound from three underwater explosions near Perth, Australia, was detected near Bermuda. A recent attempt [Munk et al., J. Phys. Ocean. 18, 1876 (1988)] to calculate propagation paths for this event included rotational flattening of the Earth and horizontal refraction determined from the vertical sound speed minimum. That calculation left Bermuda in a shadow zone. The current work invokes adiabatic mode theory to include refraction due to horizontal variations in the vertical mode structure. These results include separate horizontal rays for each of the first few vertical modes, using an archival data set of 230 ocean sound profiles to generate the modes numerically. Where appropriate, interaction with bathymetry is included. This solution possesses two eigenray groups: Group A passes just south of the Cape of Good Hope, at which point group B is almost 1000 km to the south. Intermediate rays are blocked by islands. Group A proceeds unimpeded to Bermuda for a total time of flight of 13 354 +/- 5 s, while group B interacts slightly with bathymetry off Brazil, arriving at 13 403 +/- 9 s, and suffering roughly 7-12 dB more bottom attenuation. The spread in these arrivals overlaps satisfactorily with experimental data (main arrival at 13 364 +/- 5 s; pulse train half-width 15 s; second arrival 30 +/- 5 s later roughly 10 dB below the first arrival). C1 PLANNING SYST INC,MCLEAN,VA 22102. RP HEANEY, KD (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 17 TC 50 Z9 50 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 NOV PY 1991 VL 90 IS 5 BP 2586 EP 2594 DI 10.1121/1.402062 PG 9 WC Acoustics; Audiology & Speech-Language Pathology SC Acoustics; Audiology & Speech-Language Pathology GA GN734 UT WOS:A1991GN73400021 ER PT J AU GABRIELSON, TB AF GABRIELSON, TB TI RADIATION FROM A SUBMERGED THERMOACOUSTIC SOURCE SO JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA LA English DT Article ID ENGINES AB Radiation of sound from a submerged and freely flooded tube, closed at one end and open at the other, follows well-known relationships if the exit dimension is much smaller than a wavelength. If the tube is instead filled with a gas and submerged in water, the radiated power is higher than that of the flooded tube for the same internal acoustic pressure. If the density-sound-speed product, rho-c, is much higher in the liquid than in the gas, as would normally be the case, then the radiated power is greater by the factor 1/0.36(ka)2, where k is the wave number in the water and a is the tube radius. This provides an ideal setting for construction of an underwater acoustic source using a standing-wave thermoacoustic driver since this driver is force limited rather than displacement limited. The performance is ultimately limited by the hydrostatic pressure and the dimensions of the tube. RP GABRIELSON, TB (reprint author), USN,CTR AIR DEV,CODE 5044,WARMINSTER,PA 18974, USA. 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 0001-4966 J9 J ACOUST SOC AM JI J. Acoust. Soc. Am. PD NOV PY 1991 VL 90 IS 5 BP 2628 EP 2636 DI 10.1121/1.402066 PG 9 WC Acoustics; Audiology & Speech-Language Pathology SC Acoustics; Audiology & Speech-Language Pathology GA GN734 UT WOS:A1991GN73400026 ER PT J AU LUKER, LD ZALESAK, JF AF LUKER, LD ZALESAK, JF TI FREE-FIELD ACOUSTIC CALIBRATION OF LONG UNDERWATER ACOUSTIC ARRAYS IN A CLOSED CHAMBER SO JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA LA English DT Article AB In this paper a closed-chamber technique for measuring the complex free-field sensitivity and directivity patterns of long underwater acoustic arrays is described. Performing these free-field calibrations normally requires a large body of water to ensure that the reflections from the sides, surface, and bottom have a negligible effect on the measurement. The chamber contains acoustic projectors and monitoring hydrophones located along its length. The projectors are driven to produce an acoustic pressure field in the chamber that is equivalent to a free-field plane acoustic wave propagating from any angle of incidence. This is accomplished by first measuring the transfer matrix for the calibration system. The transfer matrix relates the sound pressures at the hydrophone locations to the electrical drives to the projectors. The required projector drives, both amplitude and phase, are then determined by inverting the transfer matrix. A prototype calibration system has been developed. The system can operate over the frequency range from 10 to 600 Hz and is capable of simulating depths to 410 m. Directivity patterns obtained using the prototype for a test line array are in good agreement with theoretically predicted patterns. RP LUKER, LD (reprint author), NAVAL RES LAB,UNDERWATER SOUND REFERENCE DETACHMENT,POB 568337,ORLANDO,FL 32856, USA. NR 4 TC 0 Z9 0 U1 0 U2 0 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0001-4966 J9 J ACOUST SOC AM JI J. Acoust. Soc. Am. PD NOV PY 1991 VL 90 IS 5 BP 2652 EP 2657 DI 10.1121/1.402068 PG 6 WC Acoustics; Audiology & Speech-Language Pathology SC Acoustics; Audiology & Speech-Language Pathology GA GN734 UT WOS:A1991GN73400028 ER PT J AU GAUMOND, CF DRAGONETTE, LR AF GAUMOND, CF DRAGONETTE, LR TI FORM FUNCTION DEPENDENCE ON RIGIDITY AND MASS SO JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA LA English DT Article AB The backscattered form function of an infinite cylinder becomes very small at a certain value of thickness for values of the dimensionless frequency ka < 1. This phenomena is examined by deriving the equations of motion in terms of the overall mass and compressibility of the cylinder within a thin shell approximation. The value of the form function is determined for the most part by the first two terms in the normal mode expansion. These two terms are of comparable magnitude. Additionally, each of these two terms is shown to depend primarily on either the mass or compressibility of the cylinder. Cancellation of these two terms occurs at the value of thickness for which the backscattered form function is very small. RP GAUMOND, CF (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 6 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 0001-4966 J9 J ACOUST SOC AM JI J. Acoust. Soc. Am. PD NOV PY 1991 VL 90 IS 5 BP 2692 EP 2696 DI 10.1121/1.401864 PG 5 WC Acoustics; Audiology & Speech-Language Pathology SC Acoustics; Audiology & Speech-Language Pathology GA GN734 UT WOS:A1991GN73400033 ER PT J AU FORBES, M LETCHER, S STEPANISHEN, P AF FORBES, M LETCHER, S STEPANISHEN, P TI A WAVE VECTOR, TIME-DOMAIN METHOD OF FORWARD PROJECTING TIME-DEPENDENT PRESSURE FIELDS SO JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA LA English DT Article ID CONVENTIONAL LIGHT DIFFRACTION; ULTRASONIC FIELDS; TRANSIENT RADIATION; FOURIER ACOUSTICS; RECONSTRUCTION AB A wave vector, time-domain (k - t) method of forward projecting time-dependent pressure fields from complex vibrators is developed using space-time Fourier transform methods. Axisymmetric fields are included as a special case of the general formulation in which a pressure field at one plane can be forward projected to other planes. In brief, a wave vector, time-domain representation of the field at one plane is forward projected via a temporal convolution with a wave vector, time-domain impulse response that is dependent on the projection distance. The projected field is then obtained via the use of an inverse spatial Fourier transform. A numerical study of the method illustrates the accuracy of the approach when implemented using fast Fourier transform (FFT) algorithms. The forward projections of simulated pressure fields from a planar ultrasonic transducer are shown to be in excellent agreement with corresponding results from the use of a time-domain impulse response method. C1 UNIV RHODE ISL,DEPT PHYS,KINGSTON,RI 02881. UNIV RHODE ISL,DEPT OCEAN ENGN,KINGSTON,RI 02881. RP FORBES, M (reprint author), USN,CTR UNDERWATER SYST,NEWPORT,RI 02840, USA. NR 20 TC 21 Z9 23 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 NOV PY 1991 VL 90 IS 5 BP 2782 EP 2793 DI 10.1121/1.401875 PG 12 WC Acoustics; Audiology & Speech-Language Pathology SC Acoustics; Audiology & Speech-Language Pathology GA GN734 UT WOS:A1991GN73400044 ER PT J AU STEPANISHEN, P FORBES, M LETCHER, S AF STEPANISHEN, P FORBES, M LETCHER, S TI THE RELATIONSHIP BETWEEN THE IMPULSE-RESPONSE AND ANGULAR SPECTRUM METHODS TO EVALUATE ACOUSTIC TRANSIENT FIELDS SO JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA LA English DT Article ID RADIATION AB Impulse response time domain and angular spectrum or wave vector time-domain methods can be used to investigate the spatial temporal characteristics of acoustic fields from planar ultrasonic transducers which are subjected to pulsed wideband excitations. Both methods are developed here from the time-dependent Green's function solution of the initial-boundary value problem. The close relationship of the methods is made apparent by the use of spatial-temporal Fourier transform techniques of analysis. Axisymmetric fields are addressed as a special case via the use of Hankel and Fourier transform techniques. Finally, classical solutions to the associated harmonic boundary value problems are then shown to result from temporal Fourier transforms of the time-dependent field solutions. C1 UNIV RHODE ISL,DEPT PHYS,KINGSTON,RI 02881. USN,CTR UNDERWATER SYST,NEWPORT,RI 02840. RP STEPANISHEN, P (reprint author), UNIV RHODE ISL,DEPT OCEAN ENGN,KINGSTON,RI 02881, USA. NR 13 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 0001-4966 J9 J ACOUST SOC AM JI J. Acoust. Soc. Am. PD NOV PY 1991 VL 90 IS 5 BP 2794 EP 2798 DI 10.1121/1.401876 PG 5 WC Acoustics; Audiology & Speech-Language Pathology SC Acoustics; Audiology & Speech-Language Pathology GA GN734 UT WOS:A1991GN73400045 ER PT J AU PIQUETTE, JC AF PIQUETTE, JC TI TECHNIQUE FOR DETECTING THE PRESENCE OF FINITE SAMPLE-SIZE EFFECTS IN TRANSMITTED-WAVE MEASUREMENTS MADE ON MULTILAYER UNDERWATER ACOUSTIC PANELS SO JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA LA English DT Article ID REFLECTION AB An experimental technique for detecting the presence (and magnitude) of finite sample-size effects in transmitted-wave measurements made on multilayer underwater acoustic panels is described. The technique is illustrated by presenting measurements made on several different sample panels. The measurements presented were made in the frequency range 2-12 kHz. Measurements are also presented which suggest that finite sample-size effects in transmitted-wave measurements may be reduced by replacing the standard steel backing plate with a plastic backing plate. RP PIQUETTE, JC (reprint author), NAVAL RES LAB,UNDERWATER SOUND REFERENCE DETACHMENT,POB 568337,ORLANDO,FL 32856, USA. NR 8 TC 6 Z9 6 U1 0 U2 0 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0001-4966 J9 J ACOUST SOC AM JI J. Acoust. Soc. Am. PD NOV PY 1991 VL 90 IS 5 BP 2831 EP 2842 DI 10.1121/1.401880 PG 12 WC Acoustics; Audiology & Speech-Language Pathology SC Acoustics; Audiology & Speech-Language Pathology GA GN734 UT WOS:A1991GN73400049 ER PT J AU DUTTA, I ELKIN, LR KING, JD AF DUTTA, I ELKIN, LR KING, JD TI CORROSION BEHAVIOR OF A P130X GRAPHITE FIBER REINFORCED 6063 ALUMINUM COMPOSITE LAMINATE IN AQUEOUS ENVIRONMENTS SO JOURNAL OF THE ELECTROCHEMICAL SOCIETY LA English DT Article ID METAL MATRIX COMPOSITES; ALLOY AB The aqueous corrosion behavior of 0/90 cross-plied P130x graphite fiber reinforced 6063 Al composite laminates was studied in deaerated and aerated aqueous Na2SO4 and NaCl solutions using immersion and electrochemical techniques. Special emphasis was given to the identification of the principal mechanism(s) of corrosion. It was demonstrated conclusively via microscopic and electrochemical considerations that galvanic attack of the matrix was by far the dominant mechanism of corrosion in both solutions when Al and graphite are simultaneously exposed. Localized attack of microstructural segregations, if operative, was negligible compared to galvanic corrosion. When graphite is not exposed to the electrolyte, pitting of the surface foil, followed by galvanic attack of the matrix once the pit penetrates to the underlying graphite fibers, was found to be the primary corrosion mechanism. The effects of matrix heat-treatment, solution pH, sulfite ion contamination, and solution aeration on the electrochemical parameters and the overall corrosion behavior in 3.5% NaCl solutions were also studied. In general, the susceptibilities of general, galvanic, and localized corrosion were found to increase at lower pH levels and in the presence of sulfite ion contamination. Progressive aging of the matrix decreased corrosion susceptibility in deaerated solutions, but seemed to increase it in aerated solutions. The impact of each of the above parameters on the electrochemical nature of the various operative corrosion processes has been discussed in detail. RP DUTTA, I (reprint author), USN,POSTGRAD SCH,DEPT MECH ENGN,MONTEREY,CA 93943, USA. NR 24 TC 8 Z9 8 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 NOV PY 1991 VL 138 IS 11 BP 3199 EP 3209 DI 10.1149/1.2085393 PG 11 WC Electrochemistry; Materials Science, Coatings & Films SC Electrochemistry; Materials Science GA GN909 UT WOS:A1991GN90900012 ER PT J AU SCHRADY, D WADSWORTH, D AF SCHRADY, D WADSWORTH, D TI NAVAL COMBAT LOGISTICS SUPPORT SYSTEM SO JOURNAL OF THE OPERATIONAL RESEARCH SOCIETY LA English DT Article DE DEFENSE STUDIES; NAVAL LOGISTICS; MODELING; PREDICTION; DECISION AID AB The subject matter is the sustainability of naval forces in combat and the intimate relationships between tactics and logistics. The observation is made that it has been a long time since the United States Navy has worried about logistics in combat and that to some extent combat logistics have become somebody else's responsibility. It is argued that combat logistics is inescapably the force commander's responsibility and its dimensions are sketched. Necessarily, the amount of data and calculation in extensive if an accurate picture of the combat logistics states of the force are to be maintained predictions of future states are to be made. It is in the predictions of future states that the interactions between tactics and logistics become most apparent. The data storage and retrieval and computational aspects suggest a microprocessor-based support system. BGLCSS (battle group logistics co-ordinator support system) is a program of combat logistics data, event routines, and algorithms designed to allow the logistics co-ordinator to track and predict force combat logistics states and provide timely and meaningful insight to the force commander. RP SCHRADY, D (reprint author), NAVAL POST GRAD SCH,DEPT OPERAT RES,MONTEREY,CA, USA. NR 5 TC 5 Z9 5 U1 0 U2 1 PU STOCKTON PRESS PI BASINGSTOKE PA HOUNDMILLS, BASINGSTOKE, HAMPSHIRE, ENGLAND RG21 6XS SN 0160-5682 J9 J OPER RES SOC JI J. Oper. Res. Soc. PD NOV PY 1991 VL 42 IS 11 BP 941 EP 948 DI 10.1057/jors.1991.184 PG 8 WC Management; Operations Research & Management Science SC Business & Economics; Operations Research & Management Science GA GP547 UT WOS:A1991GP54700002 ER PT J AU BELL, MC OLSHAKER, JS BROWN, CK MCNAMEE, GA FAUVER, GM AF BELL, MC OLSHAKER, JS BROWN, CK MCNAMEE, GA FAUVER, GM TI INTRAOSSEOUS TRANSFUSION IN AN ANESTHETIZED SWINE MODEL USING CR-51 LABELED AUTOLOGOUS RED-BLOOD-CELLS SO JOURNAL OF TRAUMA-INJURY INFECTION AND CRITICAL CARE LA English DT Article ID PEDIATRIC RESUSCITATION; INFUSIONS; EMERGENCY; ACCESS AB Peripheral venous access can often be difficult to obtain in infants and young children. Landmark articles in the 1940s showed that the intraosseous (IO) route was a viable one for resuscitation. While anecdotal reports and clinical experience suggest that blood products, can be transfused via the IO route, it has not been specifically studied nor documented. We performed a prospective study to document the feasibility of red blood cell transfusion via the IO space. We studied the rapid infusion of Cr-51-labeled red blood cells via the IO space through an 18-gauge IO needle in three normovolemic immature swine. Serial central venous samples were removed at 30 seconds and at 1, 5 15, 30, and 60 minutes and analyzed for evidence of radiolabeling. Our results revealed rapid delivery of radiolabeled red blood cells into the central circulation with no evidence of early hemolysis. Highest counts were seen in samples taken at 30 seconds to 1 minute. We conclude that the IO route is a viable means for blood transfusion in a nonhemorrhagic model. C1 USN HOSP,DEPT EMERGENCY MED,SAN DIEGO,CA 92134. USN HOSP,DEPT NUCL MED,SAN DIEGO,CA 92134. UNIV MARYLAND,HOSP MED SERV,DEPT SURG,DIV EMERGENCY MED,BALTIMORE,MD 21201. E CAROLINA UNIV,HOSP MEM,SCH MED,GREENVILLE,NC 27834. RP BELL, MC (reprint author), USN HOSP,DEPT CLIN INVEST,SAN DIEGO,CA 92134, USA. NR 33 TC 6 Z9 6 U1 0 U2 0 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 NOV PY 1991 VL 31 IS 11 BP 1487 EP 1489 DI 10.1097/00005373-199111000-00004 PG 3 WC Critical Care Medicine; Surgery SC General & Internal Medicine; Surgery GA GR601 UT WOS:A1991GR60100004 PM 1942168 ER PT J AU GUBLER, KD WISNER, DH BLAISDELL, FW AF GUBLER, KD WISNER, DH BLAISDELL, FW TI MULTIPLE VESSEL INJURY TO BRANCHES OF THE AORTIC-ARCH - CASE-REPORT SO JOURNAL OF TRAUMA-INJURY INFECTION AND CRITICAL CARE LA English DT Article ID GREAT-VESSELS; TRAUMATIC AVULSION; INNOMINATE-ARTERY AB A case of multiple injuries to the branches of the aortic arch following blunt trauma is reported. Prompt diagnosis and early operation resulted in a favorable outcome. C1 USN HOSP,OAKLAND,CA. UNIV CALIF DAVIS,SACRAMENTO MED CTR,SACRAMENTO,CA 95817. NR 18 TC 5 Z9 5 U1 0 U2 0 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 NOV PY 1991 VL 31 IS 11 BP 1566 EP 1568 DI 10.1097/00005373-199111000-00023 PG 3 WC Critical Care Medicine; Surgery SC General & Internal Medicine; Surgery GA GR601 UT WOS:A1991GR60100023 PM 1942187 ER PT J AU BERMUDEZ, VM AF BERMUDEZ, VM TI GROWTH OF ULTRATHIN NI-LAYERS ON NI(100) - INFRARED-SPECTROSCOPY OF ADSORBED CARBON-MONOXIDE AS A STRUCTURAL PROBE SO JOURNAL OF VACUUM SCIENCE & TECHNOLOGY A-VACUUM SURFACES AND FILMS LA English DT Note ID NOBLE-METAL SURFACES; MEAN FREE PATHS; ABSORPTION SPECTROSCOPY; REFLECTION-ABSORPTION; ADSORPTION STATES; SELF-DIFFUSION; CO; MONOLAYERS; SPECTRA; NI(111) RP BERMUDEZ, VM (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 33 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 0734-2101 J9 J VAC SCI TECHNOL A JI J. Vac. Sci. Technol. A-Vac. Surf. Films PD NOV-DEC PY 1991 VL 9 IS 6 BP 3169 EP 3172 DI 10.1116/1.577139 PG 4 WC Materials Science, Coatings & Films; Physics, Applied SC Materials Science; Physics GA GP815 UT WOS:A1991GP81500047 ER PT J AU DOBISZ, EA MARRIAN, CRK AF DOBISZ, EA MARRIAN, CRK TI SCANNING TUNNELING MICROSCOPE LITHOGRAPHY - A SOLUTION TO ELECTRON-SCATTERING SO JOURNAL OF VACUUM SCIENCE & TECHNOLOGY B LA English DT Article; Proceedings Paper CT 35TH INTERNATIONAL SYMP ON ELECTRON, ION, AND PHOTON BEAMS CY MAY 28-31, 1991 CL SEATTLE, WA SP AMER VACUUM SOC, IEEE, ELECTR DEVICE, OPT SOC AMER ID BEAM LITHOGRAPHY; EXPOSURE AB The scanning tunneling microscope (STM) operated in the field emission mode is shown to have important lithographic applications. The technological potential of the technique is demonstrated by patterning films up to 80 nm thick of SAL-601-ER7, a negative resist from Shipley. With the STM, 22 nm lines of developed resist have been written on Si and 35 nm lines on GaAs. For comparison, exposures were made with a 50 kV, 17 nm 1/e diameter electron beam in identically prepared and processed resist films on a variety of substrates. The 50 kV probe produced minimum linewidths of: 60 nm on a 200 nm Si3N4 membrane; 70 nm on a 200 nm Si3N4 film on a bulk Si substrate; 95 nm on a bulk Si substrate; and 186 nm on a bulk GaAs substrate. The strong substrate dependence indicates that the resolution, at 50 kV, is determined by electron scattering rather than the post exposure processing of the resist. Low voltage lithography with an STM offers a technique which greatly reduces the effects of electron scattering with a consequent improvement in resolution. In addition, the results of the Si3N4 film suggest a novel way to reduce the effects of backscattered electrons in 50 kV lithography. RP DOBISZ, EA (reprint author), USN,RES LAB,DIV ELECTR SCI & TECHNOL,WASHINGTON,DC 20375, USA. NR 13 TC 24 Z9 24 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 NOV-DEC PY 1991 VL 9 IS 6 BP 3024 EP 3027 DI 10.1116/1.585362 PG 4 WC Engineering, Electrical & Electronic; Nanoscience & Nanotechnology; Physics, Applied SC Engineering; Science & Technology - Other Topics; Physics GA GW423 UT WOS:A1991GW42300057 ER PT J AU RHEE, KW TING, AC SHIREY, LM FOSTER, KW ANDREWS, JM PECKERAR, MC KU, YC AF RHEE, KW TING, AC SHIREY, LM FOSTER, KW ANDREWS, JM PECKERAR, MC KU, YC TI PATTERNING TUNGSTEN FILMS WITH AN ELECTRON-BEAM LITHOGRAPHY SYSTEM AT 50 KEV FOR X-RAY MASK APPLICATIONS SO JOURNAL OF VACUUM SCIENCE & TECHNOLOGY B LA English DT Article; Proceedings Paper CT 35TH INTERNATIONAL SYMP ON ELECTRON, ION, AND PHOTON BEAMS CY MAY 28-31, 1991 CL SEATTLE, WA SP AMER VACUUM SOC, IEEE, ELECTR DEVICE, OPT SOC AMER AB The application of electron beam lithography for the fabrication of x-ray masks is essential in the development of x-ray lithography technology. In this paper we present experimental results on the patterning of submicron (2-0.25-mu-m) features into a single-layer negative e-beam resist and then subsequent transfer of these patterns onto a 0.4-mu-m-thick tungsten film by reactive ion etching. To study the dependence of the proximity effect on the substrate material, a comparison of linewidths and sidewall profiles of electron beam resist images on silicon, silicon dioxide on silicon, and tungsten on silicon wafers has been established. C1 USN,RES LAB,DIV ELECTR SCI & TECHNOL,NANOELECTR PROC FACIL,WASHINGTON,DC 20375. MIT,DEPT ELECT ENGN & COMP SCI,CAMBRIDGE,MA 02139. RI Shirey, Loretta/B-3164-2013 OI Shirey, Loretta/0000-0003-2600-3405 NR 11 TC 10 Z9 10 U1 0 U2 3 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 NOV-DEC PY 1991 VL 9 IS 6 BP 3292 EP 3296 DI 10.1116/1.585306 PG 5 WC Engineering, Electrical & Electronic; Nanoscience & Nanotechnology; Physics, Applied SC Engineering; Science & Technology - Other Topics; Physics GA GW423 UT WOS:A1991GW42300111 ER PT J AU MALEK, CK KEBABI, B CHARAI, A DELAHOUSSAYE, P AF MALEK, CK KEBABI, B CHARAI, A DELAHOUSSAYE, P TI EFFECT OF THERMAL-TREATMENT ON THE MECHANICAL AND STRUCTURAL-PROPERTIES OF GOLD THIN-FILMS SO JOURNAL OF VACUUM SCIENCE & TECHNOLOGY B LA English DT Article; Proceedings Paper CT 35TH INTERNATIONAL SYMP ON ELECTRON, ION, AND PHOTON BEAMS CY MAY 28-31, 1991 CL SEATTLE, WA SP AMER VACUUM SOC, IEEE, ELECTR DEVICE, OPT SOC AMER ID STRESS AB Low-stress (< 50 MPa) gold films 0.7- and 2-mu-m thick were deposited by electroplating from a cyanide solution at 40-degrees-C at a current density of 2.5 mA/cm2. Thin gold films under higher stress were electron-beam evaporated at room temperature or sputtered at a power of 150 W under 2-Pa argon gas. The stress dependence of these films on the post-deposition annealing temperature up to 200-degrees-C was investigated, using an interferometric method at room temperature. The stress evolution is discussed in relationship to the thermally induced changes in the structure and the microstructure of the various films investigated by transmission electron microscopy. C1 FAC SCI & TECH ST JEROME,CNRS,URA 443,MET LAB,F-13397 MARSEILLE 13,FRANCE. USN,CTR OCEAN SYST,SAN DIEGO,CA 92152. RP MALEK, CK (reprint author), LAB MICROSTRUCT & MICROELECTR,196 AV H RAVERA,F-92220 BAGNEUX,FRANCE. NR 8 TC 3 Z9 3 U1 2 U2 7 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 NOV-DEC PY 1991 VL 9 IS 6 BP 3329 EP 3332 DI 10.1116/1.585336 PG 4 WC Engineering, Electrical & Electronic; Nanoscience & Nanotechnology; Physics, Applied SC Engineering; Science & Technology - Other Topics; Physics GA GW423 UT WOS:A1991GW42300119 ER PT J AU CALVERT, JM CHEN, MS DULCEY, CS GEORGER, JH PECKERAR, MC SCHNUR, JM SCHOEN, PE AF CALVERT, JM CHEN, MS DULCEY, CS GEORGER, JH PECKERAR, MC SCHNUR, JM SCHOEN, PE TI DEEP ULTRAVIOLET PATTERNING OF MONOLAYER FILMS FOR HIGH-RESOLUTION LITHOGRAPHY SO JOURNAL OF VACUUM SCIENCE & TECHNOLOGY B LA English DT Article; Proceedings Paper CT 35TH INTERNATIONAL SYMP ON ELECTRON, ION, AND PHOTON BEAMS CY MAY 28-31, 1991 CL SEATTLE, WA SP AMER VACUUM SOC, IEEE, ELECTR DEVICE, OPT SOC AMER ID RESIST AB A new process has been developed for high resolution photolithography that employs chemisorbed monolayer films as the surface imaging layers. Organosilane treated surfaces are exposed to patterned deep UV radiation, either from excimer laser or lamp sources. The photochemical process modifies the surface wettability and reactivity of the film. Organosilane films patterned by deep UV radiation are treated with a Pd/Sn catalyst and then metallized with electroless copper and nickel baths to yield metal films several 100 angstrom thick. The metal is selectively deposited in the unexposed regions of the film to produce a positive tone image. The patterned metal film is then utilized as a plasma hard etch barrier in a reactive ion etch, allowing efficient pattern transfer into the underlying substrate and producing features with linewidths to 0.4-mu-m. Electrical testing of processed substrates demonstrates compatibility of the process with subsequent device performance, and working transistor test structures have been fabricated. Decoupling the imaging (monolayer surface imaging layer) and resist (metal film) functions of a photoresist allows separate optimization of each function in this scheme. The patterning process is very general and may be applied to a variety of substrate types. Other potential applications include patterned wettability and reactivity of surfaces for selective attachment of other species such as fluorophores or biological moieties. RP CALVERT, JM (reprint author), USN,RES LAB,CTR BIO MOLEC SCI & ENGN,WASHINGTON,DC 20375, USA. NR 20 TC 50 Z9 50 U1 1 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 NOV-DEC PY 1991 VL 9 IS 6 BP 3447 EP 3450 DI 10.1116/1.585820 PG 4 WC Engineering, Electrical & Electronic; Nanoscience & Nanotechnology; Physics, Applied SC Engineering; Science & Technology - Other Topics; Physics GA GW423 UT WOS:A1991GW42300140 ER PT J AU GLEMBOCKI, OJ TAYLOR, BE DOBISZ, EA AF GLEMBOCKI, OJ TAYLOR, BE DOBISZ, EA TI OPTICAL STUDIES OF DRY ETCHED GAAS SO JOURNAL OF VACUUM SCIENCE & TECHNOLOGY B LA English DT Article; Proceedings Paper CT 35TH INTERNATIONAL SYMP ON ELECTRON, ION, AND PHOTON BEAMS CY MAY 28-31, 1991 CL SEATTLE, WA SP AMER VACUUM SOC, IEEE, ELECTR DEVICE, OPT SOC AMER ID INDUCED DAMAGE; SCATTERING AB Reactive-ion etching (RIE) and chemically assisted ion-beam etching are routinely used in the fabrication of submicrometer features. Both techniques are known to produce electrical damage. We have used a combination of Raman spectroscopy and photoreflectance to study the effects of dry etching on the depletion layer width and built-in electric field of heavily doped GaAs. We find that RIE reduces the built-in electric field and at the same time increases the depletion layer width. These results can be understood in terms of the formation of a more insulating layer near the surface. Our analysis shows that even though the Fermi-level pinning position can change, the predominant effect of dry etching is to change the carrier density of the near-surface region. We also observe that the use of chlorine-based species in the etch reduces the electrical damage. RP GLEMBOCKI, OJ (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 21 TC 11 Z9 11 U1 1 U2 1 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 1071-1023 J9 J VAC SCI TECHNOL B JI J. Vac. Sci. Technol. B PD NOV-DEC PY 1991 VL 9 IS 6 BP 3546 EP 3550 DI 10.1116/1.585842 PG 5 WC Engineering, Electrical & Electronic; Nanoscience & Nanotechnology; Physics, Applied SC Engineering; Science & Technology - Other Topics; Physics GA GW423 UT WOS:A1991GW42300162 ER PT J AU AKERMAN, J JOHNSON, FR BERGMAN, L AF AKERMAN, J JOHNSON, FR BERGMAN, L TI PAYING FOR SAFETY - VOLUNTARY REDUCTION OF RESIDENTIAL RADON RISKS SO LAND ECONOMICS LA English DT Article ID AIR C1 RES TRIANGLE INST,RES TRIANGLE PK,NC 27709. USN ACAD,ANNAPOLIS,MD 21402. STOCKHOLM SCH ECON,ENVIRONM & ENERGY ECON,STOCKHOLM,SWEDEN. RP AKERMAN, J (reprint author), INST ECON & SOCIAL RES,STOCKHOLM,SWEDEN. NR 25 TC 9 Z9 9 U1 0 U2 0 PU UNIV WISCONSIN PI MADISON PA SOCIAL SCIENCE BLDG, MADISON, WI 53706 SN 0023-7639 J9 LAND ECON JI Land Econ. PD NOV PY 1991 VL 67 IS 4 BP 435 EP 446 DI 10.2307/3146550 PG 12 WC Economics; Environmental Studies SC Business & Economics; Environmental Sciences & Ecology GA GW597 UT WOS:A1991GW59700006 ER PT J AU COLTON, RJ MARRIAN, CRK AF COLTON, RJ MARRIAN, CRK TI VACUUM TECHNOLOGY FACILITATES MATERIALS SCIENCE SO LASER FOCUS WORLD LA English DT Article C1 USN,RES LAB,NANOELECTR PHYS SECT,WASHINGTON,DC 20375. RP COLTON, RJ (reprint author), USN,RES LAB,SURFACE SPECT SECT,WASHINGTON,DC 20375, USA. NR 0 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 NOV PY 1991 VL 27 IS 11 BP 119 EP & PG 0 WC Optics SC Optics GA GP405 UT WOS:A1991GP40500020 ER PT J AU KIM, OK LEE, HS YOON, TH SHASHIDHAR, R AF KIM, OK LEE, HS YOON, TH SHASHIDHAR, R TI LIQUID-CRYSTALLINE BEHAVIOR OF BENZOBISTHIAZOLE DERIVATIVES AS A RIGID ROD POLYMER MODEL SO LIQUID CRYSTALS LA English DT Article ID SMECTIC-C PHASE; COMPLEXES; CHAIN AB Novel materials with a new type of rigid core, namely benzobisthiazole, have been synthesized. The exhibition of liquid-crystallinity is found to be dependent upon the linkage between the rigid core and the alkyloxy phenyl terminal moieties. An interesting feature is the occurrence of tilted smectic phases (smectic C and smectic F) even though there is no significant central dipole moment transverse to the molecule. C1 USN,RES LAB,CTR BIOMOLEC SCI & ENGN,WASHINGTON,DC 20375. RP KIM, OK (reprint author), USN,RES LAB,MAT CHEM BRANCH,CODE 6120,WASHINGTON,DC 20375, USA. 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 0267-8292 J9 LIQ CRYST JI Liq. Cryst. PD NOV PY 1991 VL 10 IS 5 BP 725 EP 731 DI 10.1080/02678299108241740 PG 7 WC Chemistry, Multidisciplinary; Crystallography; Materials Science, Multidisciplinary SC Chemistry; Crystallography; Materials Science GA GJ889 UT WOS:A1991GJ88900012 ER PT J AU JONES, RL AF JONES, RL TI THE DEVELOPMENT OF HOT-CORROSION-RESISTANT ZIRCONIA THERMAL BARRIER COATINGS SO MATERIALS AT HIGH TEMPERATURES LA English DT Article DE HOT CORROSION; COATINGS; ZIRCONIA ID STABILIZED ZIRCONIA; VANADATE; SODIUM; VANADIUM; OXIDES AB Zirconia thermal barrier coatings are now essentially limited to 'clean fuel' engines because the commonly used stabilizers for zirconia (CaO, MgO, Y2O3) react with the sulphur and vanadium contaminants contained in low quality fuel. Corrosion-resistant stabilizers for zirconia have been sought as a response to this problem, with ceria (CeO2) and, more recently, scandia (Sc2O3) and india (In2O3) being identified. This paper outlines some of the concepts, chemical reactions and thermodynamics that are involved in the development of hot-corrosion-resistant zirconia ceramics. RP JONES, RL (reprint author), USN,RES LAB,DIV MED,WASHINGTON,DC 20375, USA. NR 30 TC 27 Z9 28 U1 1 U2 3 PU BUTTERWORTH-HEINEMANN LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, OXON, ENGLAND OX5 1GB SN 0960-3409 J9 MATER HIGH TEMP JI Mater. High Temp. PD NOV PY 1991 VL 9 IS 4 BP 228 EP 236 PG 9 WC Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Materials Science; Metallurgy & Metallurgical Engineering GA HG662 UT WOS:A1991HG66200007 ER PT J AU RAI, RS MAHAJAN, S MICHEL, DJ SMITH, HH MCDEVITT, S JOHNSON, CJ AF RAI, RS MAHAJAN, S MICHEL, DJ SMITH, HH MCDEVITT, S JOHNSON, CJ TI DEFORMATION-BEHAVIOR OF CDTE AND (CD,ZN)TE SINGLE-CRYSTALS BETWEEN 200-DEGREES-C AND 600-DEGREES-C SO MATERIALS SCIENCE AND ENGINEERING B-SOLID STATE MATERIALS FOR ADVANCED TECHNOLOGY LA English DT Article ID INP; GAAS; SEMICONDUCTORS; CD1-XZNXTE; REDUCTION; GROWTH AB The deformation behavior of CdTe and (Cd,Zn)Te single crystals oriented for single slip has been investigated in the temperature range 200-600-degrees-C. The addition of 4.5 at.% Zn increases the yield strength by about eight times over that of CdTe crystals. Further, in both cases the yield strengths are nearly temperature independent above 300-degrees-C. Arguments have been developed to rationalize these observations. Deformed structures have been evaluated by transmission electron microscopy. Parallel sets of dislocations, dislocation dipoles, loops, tangles and networks are observed in the deformed samples. In addition, the (Cd,Zn)Te samples deformed at 200-degrees-C show profuse twinning. The evolution of the deformed structures has been discussed in the light of earlier studies pertaining to the elemental and III-V compound semiconductors. Also, the formation of twins is rationalized. C1 USN,RES LAB,WASHINGTON,DC 20375. II-VI INC,SAXONBURG,PA 16056. RP RAI, RS (reprint author), CARNEGIE MELLON UNIV,DEPT MET ENGN & MAT SCI,PITTSBURGH,PA 15213, USA. NR 23 TC 19 Z9 19 U1 2 U2 3 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 NOV PY 1991 VL 10 IS 3 BP 219 EP 225 DI 10.1016/0921-5107(91)90129-J PG 7 WC Materials Science, Multidisciplinary; Physics, Condensed Matter SC Materials Science; Physics GA GQ567 UT WOS:A1991GQ56700007 ER PT J AU AMUNDSON, DE WEISS, PJ AF AMUNDSON, DE WEISS, PJ TI HYPOXEMIA IN MALIGNANT CARCINOID-SYNDROME - A CASE ATTRIBUTED TO OCCULT LYMPHANGITIC METASTATIC INVOLVEMENT SO MAYO CLINIC PROCEEDINGS LA English DT Letter ID LEFT SHUNT; CARCINOMATOSIS; SCAN C1 USN HOSP,DEPT CRIT CARE MED,SAN DIEGO,CA 92134. USN HOSP,DEPT CLIN INVEST,SAN DIEGO,CA 92134. RP AMUNDSON, DE (reprint author), USN HOSP,DEPT INTERNAL MED,SAN DIEGO,CA 92134, USA. NR 7 TC 2 Z9 2 U1 0 U2 0 PU MAYO CLINIC PROCEEDINGS PI ROCHESTER PA 660 SIEBENS BLDG MAYO CLINIC, ROCHESTER, MN 55905 SN 0025-6196 J9 MAYO CLIN PROC JI Mayo Clin. Proc. PD NOV PY 1991 VL 66 IS 11 BP 1178 EP 1180 PG 3 WC Medicine, General & Internal SC General & Internal Medicine GA GP094 UT WOS:A1991GP09400015 PM 1943253 ER PT J AU DUTTA, I ALLEN, SM HAFLEY, JL AF DUTTA, I ALLEN, SM HAFLEY, JL TI EFFECT OF REINFORCEMENT ON THE AGING RESPONSE OF CAST 6061 AL-AL2O3 PARTICULATE COMPOSITES SO METALLURGICAL TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE LA English DT Article ID METAL-MATRIX COMPOSITES; MG-SI ALLOY; DISLOCATION GENERATION; ALUMINUM; FIBER; MECHANISM; BEHAVIOR AB The effect of 10 and 15 vol pct alumina particulate addition on the age hardening behavior of cast 6061 Al-matrix composites was studied using microhardness, electrical resistivity, differential scanning calorimetry, and transmission electron microscopy (TEM). It was found that the kinetics of precipitation in the matrix alloy are significantly accelerated due to the presence of reinforcements. This acceleration is attributable to the decrease in incubation time required for nucleation and the increase in solute diffusivity and hence precipitate growth rate resulting from the increase in the matrix dislocation density due to coefficient of thermal expansion (CTE) mismatch between the matrix and the reinforcements. The relative amounts of the various phases were also observed to be affected by reinforcement addition. Increasing reinforcement content decreased the volume fractions of the beta' and beta-precipitates while increasing the volume fraction of the GP-I zones. The volume fraction of silicon clusters (which are the precursors to GP zones in 6061 Al) formed during postsolution treatment aging was found to decrease with increasing reinforcement addition. The above effects have been discussed with respect to the associated mechanisms, and plausible explanations have been offered. C1 NAVSURFPAC NAVAL STN,SAN DIEGO,CA. RP DUTTA, I (reprint author), USN,POSTGRAD SCH,DEPT MECH ENGN,MONTEREY,CA 93943, USA. NR 30 TC 143 Z9 149 U1 3 U2 15 PU MINERALS METALS MATERIALS SOC PI WARRENDALE PA 420 COMMONWEALTH DR, WARRENDALE, PA 15086 SN 0360-2133 J9 METALL TRANS A PD NOV PY 1991 VL 22 IS 11 BP 2553 EP 2563 DI 10.1007/BF02851349 PG 11 WC Materials Science, Multidisciplinary SC Materials Science GA GP092 UT WOS:A1991GP09200002 ER PT J AU LANKIN, KM AF LANKIN, KM TI THE HISTORY OF THE NAVY-MEDICAL-CORPS INSIGNIA - A CASE FOR DIAGNOSIS SO MILITARY MEDICINE LA English DT Article RP LANKIN, KM (reprint author), USN,NATL MED CTR,DEPT SURG,8901 WISCONSIN AVE,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 NOV PY 1991 VL 156 IS 11 BP 615 EP 622 PG 8 WC Medicine, General & Internal SC General & Internal Medicine GA GP395 UT WOS:A1991GP39500016 PM 1771011 ER PT J AU HOLDEN, RA AF HOLDEN, RA TI THE ROLE OF TECHNOLOGY IN COMBAT SYSTEM ENGINEERING SO NAVAL ENGINEERS JOURNAL LA English DT Article AB Since the introduction of modern surface combatants there has been a significant evolution of the combat system in terms of equipment, capability and design. This evolution will continue and combat systems of the future will be vastly different than they are today. A key aspect of this evolution is the combat system design which is defined by the functional allocation, equipments and interfaces between elements. One of the factors driving design is the introduction of new technologies which offer to improve system performance. The combat system engineering problem of the past and present is how to accommodate new and emerging technology. That is, technology is considered a design driver. This is a desirable approach from the perspective of component development. From the system engineer's perspective, this approach severely limits options and ultimately results in a sub-optimal combat system design. This occurs because the available components are generally developed in isolation from one another and without specific system design requirements. A fundamental system design which can identify longterm needs is required now to provide focus to today's technology so that the various commodities of the year 2000 and beyond will be compatible. Components of the system will need to satisfy system design requirements as well as the usual performance requirements. The linkage between combat system design and technology is a responsibility of both the system engineer and the technologist. RP HOLDEN, RA (reprint author), USN,CTR SURFACE WARFARE,DIV AEGIS SHIP COMBAT SYST,SYST ENGN,DAHLGREN,VA, 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 NOV PY 1991 VL 103 IS 6 BP 38 EP 43 PG 6 WC Engineering, Marine; Engineering, Civil; Oceanography SC Engineering; Oceanography GA GP206 UT WOS:A1991GP20600002 ER PT J AU ROBBINS, T SHEN, TWT WILBAT, BB AF ROBBINS, T SHEN, TWT WILBAT, BB TI TOTAL QUALITY MANAGEMENT AND ITS APPLICATION TO F-14 DEPOT MAINTENANCE SO NAVAL ENGINEERS JOURNAL LA English DT Article AB Understanding the concepts of quality costs through the reduction of waste and process variation is fundamental to the TQM philosophy. The evolution in U.S. quality control demands a shift from the traditional method of auditing the finished product and improving quality by fixing problems to a method of auditing processes. Likewise, TQM demands proper use of statistical process control and continuous training of management and the work force to ensure continuous improvement and productivity. This paper discusses how the Naval Aviation Depot (NADEP) Norfolk, Virginia, as an example of U.S. industry, employed the new management philosophy of TQM to reduce costs and boost productivity and efficiency. A specific application of TQM is highlighted with the preparation and implementation of the F-14 aircraft maintenance competition program. As part of this effort, the Norfolk depot's challenge was to streamline operations to minimize the cost of scheduled maintenance on a delivered F-14, while simultaneously maintaining quality. The competition against private industry for the aircraft workload provided unique opportunities to use TQM to make cultural changes throughout the depot. Norfolk would demonstrate that quality products are more a function of employee knowledge and interaction than the application of traditional quality control technology. C1 USN AVIAT DEPOT,NORFOLK,VA. 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 NOV PY 1991 VL 103 IS 6 BP 44 EP 62 PG 19 WC Engineering, Marine; Engineering, Civil; Oceanography SC Engineering; Oceanography GA GP206 UT WOS:A1991GP20600003 ER PT J AU CONLEY, DT AF CONLEY, DT TI CONFIGURATION STATUS ACCOUNTING MADE AFFORDABLE SO NAVAL ENGINEERS JOURNAL LA English DT Article AB This paper describes an affordable automated configuration status accounting system that has been developed to meet the needs of the engineering community, the logistics community and the fleet. Configuration information is vital if the fleet is to be properly supported. Without complete and accurate configuration information that documents what is installed in the ship, including field changes, engineering changes, OrdAlts and MachAlts, proper support is not possible. The information system described in this paper has been installed in over 30 Navy and contractor sites. Results to date have been nothing less than outstanding, with productivity improvements in excess of 500 percent. As budgets get leaner, improvements such as this will become commonplace. We will learn to live within constrained budgets and produce higher quality products. This system is an example of what can be done with emerging technology when properly applied. RP CONLEY, DT (reprint author), USN,CTR SURFACE WEAP,LOGIST CERTIFICAT OFF SEA 04L,SILVER SPRING,MD 20910, 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 NOV PY 1991 VL 103 IS 6 BP 63 EP 70 PG 8 WC Engineering, Marine; Engineering, Civil; Oceanography SC Engineering; Oceanography GA GP206 UT WOS:A1991GP20600004 ER PT J AU FRAEDRICH, DS AF FRAEDRICH, DS TI METHODS IN CALIBRATION AND ERROR ANALYSIS FOR INFRARED IMAGING RADIOMETERS SO OPTICAL ENGINEERING LA English DT Article DE INFRARED IMAGING SYSTEMS; ERROR ANALYSIS; RADIOMETRIC CALIBRATION AB Various methods for the calibration and error estimation of imaging radiometers are described. The methodologies are presented in the form of specific examples of the calibration of the Naval Research Laboratory's airborne infrared (IR) radiometric measurement system. Two imaging radiometers are part of this system and are used to perform radiometric measurements on a variety of targets and backgrounds over a spectral range of 3 to 12-mu-m. The calibration procedures for these radiometers are presented along with an extensive error analysis that examines in detail 16 different sources of error. Such an error analysis clearly illustrates the need for proper calibration procedures. RP FRAEDRICH, DS (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 8 TC 4 Z9 4 U1 1 U2 1 PU SOC PHOTO-OPT INSTRUM ENG PI BELLINGHAM PA PO BOX 10, BELLINGHAM, WA 98227-0010 SN 0091-3286 J9 OPT ENG JI Opt. Eng. PD NOV PY 1991 VL 30 IS 11 BP 1764 EP 1770 DI 10.1117/12.55989 PG 7 WC Optics SC Optics GA GP209 UT WOS:A1991GP20900017 ER PT J AU RICHTER, JH HUGHES, HG AF RICHTER, JH HUGHES, HG TI MARINE ATMOSPHERIC EFFECTS ON ELECTROOPTICAL SYSTEMS PERFORMANCE SO OPTICAL ENGINEERING LA English DT Article DE ATMOSPHERIC EFFECTS; ELECTROOPTICAL SYSTEMS PERFORMANCE ID RELATIVE-HUMIDITY; AEROSOL MODEL; LIDAR; EXTINCTION; BACKSCATTER AB For the past 12 yr, a coordinated triservice effort has been under way in the U.S. Department of Defense to provide an atmospheric effects assessment capability for existing and planned electro-optical (EO) systems. This exploratory development effort by the U.S. Navy is reviewed. An initial marine aerosol model, the Navy Aerosol Model (NAM), which transitioned into LOWTRAN 6, and a more comprehensive model, the Navy Oceanic Vertical Aerosol Model (NOVAM), are discussed. In addition to marine aerosols and their extinction properties, accurate knowledge of marine background radiances and the effects of the intervening atmosphere are needed. Because in situ measurements of relevant environmental parameters are essential for real-time EO systems performance assessment and direct measurement of slant path extinction is most desirable, light detection and ranging (LIDAR) techniques are being developed. No technique, however, has yet emerged that is ready for shipboard implementation. A shipboard real-time performance assessment system, PREOS (performance and range for EO systems), has been developed and incorporated into the Navy's Tactical Environmental Support System (TESS), and improved target and background models are under development and will be incorporated into TESS when tested and validated. A reliable assessment capability can be used to develop tactical decision aids (TDAs), which permit optimum selection or combination of sensors and estimation of a ship's vulnerability against hostile systems. RP USN, CTR OCEAN SYST, DIV OCEAN & ATMOSPHER SCI, SAN DIEGO, CA 92152 USA. NR 35 TC 6 Z9 6 U1 0 U2 0 PU SPIE-SOC PHOTO-OPTICAL INSTRUMENTATION ENGINEERS PI BELLINGHAM PA 1000 20TH ST, PO BOX 10, BELLINGHAM, WA 98225 USA SN 0091-3286 EI 1560-2303 J9 OPT ENG JI Opt. Eng. PD NOV PY 1991 VL 30 IS 11 BP 1804 EP 1820 DI 10.1117/12.55981 PG 17 WC Optics SC Optics GA GP209 UT WOS:A1991GP20900023 ER PT J AU MCMORROW, D AF MCMORROW, D TI SEPARATION OF NUCLEAR AND ELECTRONIC CONTRIBUTIONS TO FEMTOSECOND 4-WAVE-MIXING DATA SO OPTICS COMMUNICATIONS LA English DT Article ID OPTICAL KERR DYNAMICS; LIGHT-SCATTERING; RAYLEIGH-SCATTERING; MOLECULAR-DYNAMICS; BINARY-SOLUTIONS; LIQUID CS2; ABSORPTION; MOTION; SPECTROSCOPY; RELAXATION AB A Fourier-transform method that separates the nuclear and non-resonant electronic contributions to the nonlinear-optical transient detected for transparent materials is developed and applied to femtosecond optical heterodyne detected optical Kerr effect data fluorobenzene and iodobenzene liquids. This method generates directly the impulse response function for nuclear motion, as well as the nuclear contribution to the measured transients. The role of rapidly dephased, intermolecular vibrational motions in shaping the detected response is explicitly revealed in a frequency-domain representation of the temporal data. RP MCMORROW, D (reprint author), USN,RES LAB,CODE 4613,WASHINGTON,DC 20375, USA. NR 59 TC 108 Z9 110 U1 0 U2 5 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0030-4018 J9 OPT COMMUN JI Opt. Commun. PD NOV 1 PY 1991 VL 86 IS 2 BP 236 EP 244 DI 10.1016/0030-4018(91)90565-U PG 9 WC Optics SC Optics GA GP936 UT WOS:A1991GP93600024 ER PT J AU OSOFSKY, MS RAKOTO, H OUSSET, JC ULMET, JP LEOTIN, J ASKENAZY, S CHRISEY, DB HORWITZ, JS SKELTON, EF WOLF, SA AF OSOFSKY, MS RAKOTO, H OUSSET, JC ULMET, JP LEOTIN, J ASKENAZY, S CHRISEY, DB HORWITZ, JS SKELTON, EF WOLF, SA TI CLASSICAL 2-DIMENSIONAL MAGNETORESISTANCE IN THE NORMAL STATE OF YBA2CU3O7-DELTA SO PHYSICA C LA English DT Article ID PAIR-BREAKING; SUSCEPTIBILITY; TC; ANTIFERROMAGNETISM; SUPERCONDUCTORS; FLUCTUATIONS; ANISOTROPY; PARAMETERS; FIELD AB We present results of normal state magnetoresistance measurements on a thin film of YBa2Cu3O7-delta deposited on MgO produced using pulsed laser deposition. The measurements were made as a function of the angle between the applied field and the c-axis. The MR has two components, one which is positive and scales with the normal component of the applied field and a negative isotropic term. These results confirm that the normal state properties of high-T(c) superconductors may be described using a quasi-two-dimensional Fermi liquid model. The results also bring into question earlier analyses of the fluctuation conductivity in this system and observations of weak-localization effects in other copper-oxide superconducting systems. C1 INST NATL SCI APPL,SERV CHAMPS INTENSES,F-31077 TOULOUSE,FRANCE. CTR RECH PONT A MOUSSON,CNRS,LAB ST BOBAIN,F-54704 PONT A MOUSSON,FRANCE. INST NATL SCI APPL,PHYS SOLIDES LAB,F-31077 TOULOUSE,FRANCE. RP OSOFSKY, MS (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. RI Wolf, Stuart/A-7513-2009; Osofsky, Michael/A-1050-2010 NR 31 TC 4 Z9 4 U1 0 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0921-4534 J9 PHYSICA C JI Physica C PD NOV 1 PY 1991 VL 182 IS 4-6 BP 257 EP 260 DI 10.1016/0921-4534(91)90520-9 PG 4 WC Physics, Applied SC Physics GA GR638 UT WOS:A1991GR63800008 ER PT J AU MANDELBAUM, P SEELY, JF BARSHALOM, A KLAPISCH, M AF MANDELBAUM, P SEELY, JF BARSHALOM, A KLAPISCH, M TI EFFECT OF CONFIGURATION MIXING ON 3D-4F TRANSITIONS IN HIGHLY IONIZED GA-LIKE, ZN-LIKE, AND CU-LIKE IONS SO PHYSICAL REVIEW A LA English DT Article ID X-RAY-SPECTRA; LASER-PRODUCED PLASMA; ENERGY-LEVELS; EXTENDED ANALYSIS; ATOMIC SPECTRA; TANTALUM; ARRAYS; RANGE; DISTRIBUTIONS; SEQUENCE AB It is shown that the introduction of configuration interaction through 4s4f-4p4d and 4p4f-4d2 mixing has a very significant effect on 3d-4f transitions in highly charged Ga-,Zn-, and Cu-like ions. This effect changes the width and, to a lesser extent, the mean wavelength of transition arrays as compared to the spin-orbit split array model. Because of this mixing, lines previously identified as dielectronic recombination satellites may have a non-negligible inner-shell excitation component. This should be taken into account in models for the intensities of these lines. C1 HEBREW UNIV JERUSALEM,RACAH INST PHYS,IL-91904 JERUSALEM,ISRAEL. NUCL RES CTR NEGEV,IL-84190 BEER SHEVA,ISRAEL. UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. RP MANDELBAUM, P (reprint author), USN,RES LAB,EO HULBURT CTR SPACE RES,WASHINGTON,DC 20375, USA. NR 19 TC 9 Z9 11 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 NOV 1 PY 1991 VL 44 IS 9 BP 5744 EP 5751 DI 10.1103/PhysRevA.44.5744 PG 8 WC Optics; Physics, Atomic, Molecular & Chemical SC Optics; Physics GA GP388 UT WOS:A1991GP38800050 ER PT J AU MANDELBAUM, P SEELY, JF BROWN, CM KANIA, DR KAUFFMAN, RL AF MANDELBAUM, P SEELY, JF BROWN, CM KANIA, DR KAUFFMAN, RL TI EXTENDED ANALYSIS OF THE X-RAY-SPECTRUM EMITTED BY HIGHLY IONIZED URANIUM FROM A LASER-PRODUCED PLASMA IN THE 3.1-6.4-KEV RANGE (1.9-LESS-THAN-LAMBDA-LESS-THAN-3.9 A) SO PHYSICAL REVIEW A LA English DT Article ID ENERGY-LEVELS; TM; TRANSITIONS; TANTALUM; RE; CLASSIFICATION; ATOMS; AU AB The x-ray spectrum of laser-produced uranium plasma has been obtained in the range 3.1-6.4 keV (1.9 < lambda < 3.9 angstrom). Detailed analysis of the spectrum has been performed using the HULLAC code and the unresolved-transition-array formalism. This led to the identification of most of the features of the spectrum as transitions in the Ni-like ion (U64+) and satellite transitions of neighboring ionization states. The identification is fully consistent with the previous analysis of the spectra emitted by laser-produced plasmas of lower-Z elements. C1 HEBREW UNIV JERUSALEM,RACAH INST PHYS,IL-91904 JERUSALEM,ISRAEL. UNIV CALIF LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550. RP MANDELBAUM, P (reprint author), USN,RES LAB,EO HULBURT CTR SPACE RES,WASHINGTON,DC 20375, USA. NR 17 TC 9 Z9 9 U1 2 U2 3 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1050-2947 J9 PHYS REV A JI Phys. Rev. A PD NOV 1 PY 1991 VL 44 IS 9 BP 5752 EP 5761 DI 10.1103/PhysRevA.44.5752 PG 10 WC Optics; Physics, Atomic, Molecular & Chemical SC Optics; Physics GA GP388 UT WOS:A1991GP38800051 ER PT J AU SINGH, DJ PAPACONSTANTOPOULOS, DA JULIEN, JP CYROTLACKMANN, F AF SINGH, DJ PAPACONSTANTOPOULOS, DA JULIEN, JP CYROTLACKMANN, F TI ELECTRONIC-STRUCTURE OF BA(SN,SB)O3 - ABSENCE OF SUPERCONDUCTIVITY SO PHYSICAL REVIEW B LA English DT Article ID HIGH-TEMPERATURE SUPERCONDUCTIVITY; BRILLOUIN-ZONE; SPECIAL POINTS; TOTAL-ENERGY; BAPB1-XBIXO3; INSTABILITIES; SYSTEM AB The electronic structures of BaSnO3, BaSbO3, and BaPbO3, calculated using an extended general-potential linearized augmented-plane-wave method, are reported. The electronic structures of BaSnO3 and its 6s analog BaPbO3 are found to be very different, explaining the absence of superconductivity in the Ba(Sn,Sb)O3 system. These differences are explained by a combination of the relativistic lowering of the 6s states and ion-size effects. Muffin-tin-approximation augmented-plane-wave calculations for BaSnO3 are also reported and the utility of the muffin-tin approximation for this and similar materials is discussed in terms of the differences between the two sets of calculations. C1 CNRS,ETUD PROPRIETES ELECTR SOLIDES LAB,F-38042 GRENOBLE,FRANCE. RP SINGH, DJ (reprint author), USN,RES LAB,COMPLEX SYST THEORY BRANCH,WASHINGTON,DC 20375, USA. RI Singh, David/I-2416-2012 NR 31 TC 38 Z9 38 U1 0 U2 15 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD NOV 1 PY 1991 VL 44 IS 17 BP 9519 EP 9523 DI 10.1103/PhysRevB.44.9519 PG 5 WC Physics, Condensed Matter SC Physics GA GP267 UT WOS:A1991GP26700045 ER PT J AU CLAASSEN, JH EVETTS, JE SOMEKH, RE BARBER, ZH AF CLAASSEN, JH EVETTS, JE SOMEKH, RE BARBER, ZH TI OBSERVATION OF THE SUPERCONDUCTING PROXIMITY EFFECT FROM KINETIC-INDUCTANCE MEASUREMENTS SO PHYSICAL REVIEW B LA English DT Article ID PENETRATION DEPTH AB A method is described for observing the proximity effect in a thin-film-superconductor-normal-metal bilayer. The superconducting film must be thin compared to its penetration depth. The kinetic inductance of the superconducting film alone is then proportional to lambda-2(T)/d. It is found that in a bilayer the temperature dependence of the kinetic inductance deviates significantly from this dependence at low temperatures. The kinetic inductance may be measured in a nondestructive manner using the two-coil mutual-inductance technique. Bilayers of NbN/Al and Nb/Cu have both exhibited the effect, whereas a bilayer in which the proximity coupling was purposefully suppressed had the same temperature dependence as the superconducting film alone. The effect is analyzed in terms of a spatially varying penetration depth through the film thickness, and the observations are found to be in qualitative agreement with the predictions of the model. A more exact fitting will require improved theoretical models for the proximity effect. C1 UNIV CAMBRIDGE,CAMBRIDGE CB2 3QZ,ENGLAND. RP CLAASSEN, JH (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 14 TC 31 Z9 31 U1 0 U2 4 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD NOV 1 PY 1991 VL 44 IS 17 BP 9605 EP 9608 DI 10.1103/PhysRevB.44.9605 PG 4 WC Physics, Condensed Matter SC Physics GA GP267 UT WOS:A1991GP26700054 ER PT J AU CULBERTSON, JC STROM, U WOLF, SA FULLER, WW AF CULBERTSON, JC STROM, U WOLF, SA FULLER, WW TI RESPONSE OF GRANULAR SUPERCONDUCTING YBA2.1CU3.4O7-X TO LIGHT SO PHYSICAL REVIEW B LA English DT Article ID NONBOLOMETRIC OPTICAL-RESPONSE; THIN-FILMS; EPITAXIAL-FILMS; CERMET FILMS; YBA2CU3O7-DELTA; TRANSITION AB We report measurements performed on a granular YBa2.1Cu3.4O7-x film which are consistent with a transition to the zero-resistance state that can be described as a two-dimensional transition in terms of the Kosterlitz-Thouless formalism. A photoresponse associated with this transition is interpreted in terms of a photon-assisted vortex-antivortex unbinding process. RP CULBERTSON, JC (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. RI Wolf, Stuart/A-7513-2009 NR 40 TC 20 Z9 21 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD NOV 1 PY 1991 VL 44 IS 17 BP 9609 EP 9618 DI 10.1103/PhysRevB.44.9609 PG 10 WC Physics, Condensed Matter SC Physics GA GP267 UT WOS:A1991GP26700055 ER PT J AU MCQUEEN, PG WANG, CS AF MCQUEEN, PG WANG, CS TI VARIATIONAL MONTE-CARLO EVALUATIONS OF GUTZWILLER STATES FOR THE ANDERSON-LATTICE MODEL SO PHYSICAL REVIEW B LA English DT Article ID DIMENSIONAL HUBBARD-MODEL; FERMION SYSTEMS; WAVE-FUNCTION; ELECTRON-SYSTEMS; LOW-TEMPERATURES; VALENCE PROBLEM; HEAVY FERMIONS; GROUND-STATE; SIMULATION; LIQUID AB The electronic ground states for two- and three-dimensional Anderson-lattice clusters with large Hubbard repulsion are determined variationally within the Gutzwiller ansatz by use of a stochastic algorithm for exact evaluation of matrix elements of Gutzwiller states. The algorithm is similar to one normally used for finite-temperature simulation and is described in some detail. Variational states for a variety of Hamiltonian parameters and particle densities were considered. Of particular interest is the regime of small interband hopping, which is antiferromagnetic at densities near two particles per unit cell. We found that for some Hamiltonian-parameter regimes, doping the antiferromagnetic cluster with enough particles or holes can destroy the magnetic ordering and produce a state that resembles a heavy-Fermi-liquid state, a metal with a strongly-frequency-dependent self-energy. For a 4 X 4 Anderson lattice, we present results of low-temperature quantum Monte Carlo simulations to evaluate the validity of the variational Gutzwiller ansatz. C1 UNIV MARYLAND,CTR SUPERCONDUCTING RES,COLLEGE PK,MD 20742. USN,RES LAB,COMPLEX SYST THEORY BRANCH,WASHINGTON,DC 20375. RP MCQUEEN, PG (reprint author), UNIV MARYLAND,DEPT PHYS,COLLEGE PK,MD 20742, USA. NR 37 TC 5 Z9 5 U1 0 U2 3 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD NOV 1 PY 1991 VL 44 IS 18 BP 10021 EP 10030 DI 10.1103/PhysRevB.44.10021 PG 10 WC Physics, Condensed Matter SC Physics GA GP268 UT WOS:A1991GP26800024 ER PT J AU RAJAGOPAL, AK MAHANTI, SD AF RAJAGOPAL, AK MAHANTI, SD TI HIGH-TC SUPERCONDUCTIVITY OF YBA2CU3O7/PRBA2CU3O7 SUPERLATTICES - AN INTERLAYER-COUPLING MODEL SO PHYSICAL REVIEW B LA English DT Article ID INTERACTING CONDUCTING LAYERS; CRITICAL-TEMPERATURE; YBA2CU3O7-X/PRBA2CU3O7-X SUPERLATTICES; UNIT-CELL; DEPENDENCE; NUMBER AB A simple model of intralayer and interlayer couplings based on a generalized BCS pairing theory of superlattices of layered superconductors is used to correlate the recently observed trends in the T(c)'s of YBa2Cu3O7/PrBa2Cu3O7 superlattices. These observed trends in the T(c)'s are obtained in this model if certain inequalities are satisfied among the direct and that mediated by the PrBa2Cu3O7 intercell-interlayer, intracell-interlayer couplings. These inequalities among the couplings may be reconciled in terms of the chemical structure of these systems. C1 MICHIGAN STATE UNIV,DEPT PHYS & ASTRON,E LANSING,MI 48824. MICHIGAN STATE UNIV,CTR MAT RES,E LANSING,MI 48824. RP RAJAGOPAL, AK (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 11 TC 11 Z9 11 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD NOV 1 PY 1991 VL 44 IS 18 BP 10210 EP 10214 DI 10.1103/PhysRevB.44.10210 PG 5 WC Physics, Condensed Matter SC Physics GA GP268 UT WOS:A1991GP26800046 ER PT J AU RAJAGOPAL, AK RYAN, JC AF RAJAGOPAL, AK RYAN, JC TI QUANTUM-STATE REPRESENTATIONS IN A STRONG QUANTIZING MAGNETIC-FIELD - PAIRING THEORY OF SUPERCONDUCTIVITY SO PHYSICAL REVIEW B LA English DT Article AB Two of the commonly used basis states of an electron in a strong quantizing magnetic field ("orbit center" and "angular momentum"), their interrelation, and physical interpretations are described briefly here. Their relative utility in elucidating various physical aspects is exhibited by examining (1) the exact solution of the linearized superconducting gap equation, and (2) the matrix elements of a plane wave in both representations. It is shown that the two-particle matrix element of the contact interaction, VBAR-delta (r1-r2), in the orbit-center representation is separable in the relative orbit centers. A complete set of solutions of the linearized gap equation is thereby obtained. RP RAJAGOPAL, AK (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 16 TC 25 Z9 25 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD NOV 1 PY 1991 VL 44 IS 18 BP 10280 EP 10285 DI 10.1103/PhysRevB.44.10280 PG 6 WC Physics, Condensed Matter SC Physics GA GP268 UT WOS:A1991GP26800054 ER PT J AU FAROUK, B ORAN, ES KAILASANATH, K AF FAROUK, B ORAN, ES KAILASANATH, K TI NUMERICAL SIMULATIONS OF THE STRUCTURE OF SUPERSONIC SHEAR LAYERS SO PHYSICS OF FLUIDS A-FLUID DYNAMICS LA English DT Article ID TURBULENT MIXING LAYERS; INSTABILITY AB Time-dependent two-dimensional numerical calculations were performed to study the mixing characteristics of unforced, planar, confined shear layers formed by two parallel streams of air that come into contact after passing over a splitter plate. The evolution of the shear layer was examined by systematically varying the velocities, densities, and the static pressures of the two streams that come into contact at the trailing edge of the plate. At least one of the streams was always supersonic. For the range of the parameters studied, the supersonic shear layers show some organization, albeit less coherent than their subsonic counterparts. The most amplified frequency, obtained by Fourier analysis of the velocity and pressure fluctuations, depends on the effective inlet momentum thickness. Convective Mach numbers of the streams corresponding to each side of the shear layer were found to be quite different. The simulations indicate that the single convective Mach number as derived from an isentropic model is not sufficient to characterize the mixing behavior when the velocity, pressure, and density ratios are changed independently. C1 USN,RES LAB,COMPUTAT PHYS & FLUID DYNAM LAB,WASHINGTON,DC 20375. RP FAROUK, B (reprint author), DREXEL UNIV,DEPT MECH ENGN & MECH,PHILADELPHIA,PA 19104, USA. NR 27 TC 17 Z9 17 U1 0 U2 0 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 NOV PY 1991 VL 3 IS 11 BP 2786 EP 2798 DI 10.1063/1.858167 PG 13 WC Mechanics; Physics, Fluids & Plasmas SC Mechanics; Physics GA GL829 UT WOS:A1991GL82900031 ER PT J AU ROMERO, H MORALES, GJ AF ROMERO, H MORALES, GJ TI ABSORPTION AT THE ION-ION HYBRID-RESONANCE IN THE PRESENCE OF INCOHERENT DENSITY-FLUCTUATIONS SO PHYSICS OF FLUIDS B-PLASMA PHYSICS LA English DT Article ID MODE CONVERSION; PLASMAS; CYCLOTRON; WAVE AB A numerical study is made of the effects caused by incoherent fluctuations in the minority density concentration on the absorption of fast Alfven waves at the ion-ion hybrid resonance. This work extends to the incoherent regime of a previous study by Romero and Morales [Phys. Fluids B 2, 2007 (1990)], which surveyed in detail the effects of single-mode (coherent) fluctuations. The system is represented by a Budden equation that properly describes the resonance and cutoff structure arising from spatial variations of the equilibrium magnetic field. For wave incidence such that the cutoff is encountered before the resonance layer, the absorption coefficient increases monotonically as the fluctuation amplitude is increased. A specific case is presented in which the absorption changes from approximately 0% to approximately 70% for minority density fluctuations delta-n/n0 approximately 60% that correspond to electron density variations of less than 5%. For wave incidence such that the resonance is encountered before the cutoff, the reflection coefficient increases for minority density fluctuations below 5% of the ambient value. For larger density fluctuations, the reflected energy saturates at approximately 20% of the incident wave energy. C1 USN,RES LAB,DIV PLASMA PHYS,WASHINGTON,DC 20375. RP ROMERO, H (reprint author), UNIV CALIF LOS ANGELES,DEPT PHYS,LOS ANGELES,CA 90024, USA. NR 12 TC 1 Z9 1 U1 0 U2 0 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0899-8221 J9 PHYS FLUIDS B-PLASMA PD NOV PY 1991 VL 3 IS 11 BP 2960 EP 2966 DI 10.1063/1.859929 PG 7 WC Physics, Fluids & Plasmas SC Physics GA GL828 UT WOS:A1991GL82800005 ER PT J AU HARGREAVES, TA FLIFLET, AW FISCHER, RP BARSANTI, ML AF HARGREAVES, TA FLIFLET, AW FISCHER, RP BARSANTI, ML TI DEPRESSED COLLECTOR EXPERIMENTS ON A QUASI-OPTICAL GYROTRON SO PHYSICS OF FLUIDS B-PLASMA PHYSICS LA English DT Article ID QUASI-OPTICAL GYROTRON; SINGLE-MODE OPERATION; HIGH-POWER; EFFICIENCY; MASER AB A simple, single-stage depressed collector has been tested on the quasioptical gyrotron (QOG) experiment at the Naval Research Laboratory (NRL). This is the first application of a depressed collector to a high-power gyrotron, and was relatively easily accomplished due to the natural separation of the electron beam and the output radiation in the QOG. Collector efficiencies as high as 50% and overall efficiencies up to 16% were observed. The output power reached 431 kW with an overall efficiency of 13% and a collector efficiency of 41%. The collector efficiency was limited in this experiment due to interception of approximately 15% of the electron beam on an undepressed section of the beam guide, a problem readily correctable with a small change in the beam guide dimensions. If this part of the electron beam was collected at the collector potential, the overall and collector efficiencies would increase to 16% and 55%, respectively. The maximum collector efficiency would increase to 58% (at high output power) and the best overall efficiency would increase to 20% (at lower output power). RP HARGREAVES, TA (reprint author), USN,RES LAB,DIV PLASMA PHYS,BEAM PHYS LAB,WASHINGTON,DC 20375, USA. NR 18 TC 4 Z9 4 U1 0 U2 2 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0899-8221 J9 PHYS FLUIDS B-PLASMA PD NOV PY 1991 VL 3 IS 11 BP 3171 EP 3176 DI 10.1063/1.859797 PG 6 WC Physics, Fluids & Plasmas SC Physics GA GL828 UT WOS:A1991GL82800029 ER PT J AU FERNSLER, RF LAMPE, M AF FERNSLER, RF LAMPE, M TI DEFLECTION OF ELECTRON-BEAMS BY GROUND PLANES SO PHYSICS OF FLUIDS B-PLASMA PHYSICS LA English DT Article AB Analytic methods are used to determine the effect of a nearby ground plane on the trajectory of a relativistic electron beam passing through dense gas. The beam is shown to respond to the ground plane in one of two distinct modes, determined by beam current and energy. Low-power beams deflect from the ground plane and tear longitudinally. High-power beams do not deflect or tear but tilt, i.e., the beam axis is no longer parallel to the direction of propagation. This conclusion is reached by computing the net beam force as a superposition of the "bare" ground-plane forces, the shielding forces from the beam-generated plasma, the body coupling forces induced by beam tilt, and the force that arises as the beam separates from the plasma. Effects from electromagnetic retardation and ground resistivity are shown to be negligible in typical cases of interest, and the interaction between ground planes and other external forces is discussed as well. RP FERNSLER, RF (reprint author), USN,RES LAB,DIV PLASMA PHYS,BEAM PHYS BRANCH,WASHINGTON,DC 20375, USA. NR 14 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 0899-8221 J9 PHYS FLUIDS B-PLASMA PD NOV PY 1991 VL 3 IS 11 BP 3177 EP 3187 DI 10.1063/1.859798 PG 11 WC Physics, Fluids & Plasmas SC Physics GA GL828 UT WOS:A1991GL82800030 ER PT J AU UHM, HS LEE, WM AF UHM, HS LEE, WM TI HIGH-CONCENTRATION OF DEUTERIUM IN PALLADIUM FROM PLASMA ION-IMPLANTATION SO PHYSICS OF FLUIDS B-PLASMA PHYSICS LA English DT Article ID COLD FUSION AB Based on a theoretical calculation, a new scheme to increase deuterium density in palladium over its initial value is presented. This deuterium enrichment scheme makes use of plasma ion implantation. A cylindrical palladium rod (target) preloaded with deuterium atoms, coated with a diffusion-barrier material, is immersed in a deuterium plasma. The palladium rod is connected to a high-power modulator which provides a series of negative-voltage pulses. During these negative pulses, deuterium ions fall into the target, penetrate the diffusion barrier, and are implanted inside the palladium. For reasonable system parameters allowed by present technology, it is found from theoretical calculations that the saturation deuterium density after prolonged ion implantation can be several times the palladium atomic number density. Assuming an initial deuterium density, n0 = 4 x 10(22) cm-3, it is also found that the deuterium density in palladium can triple its original value within a few days of the ion implantation for a reasonable target size. Because of the small diffusion coefficient in palladium, the incoming ions do not diffuse quickly inward, thereby accumulating near the target surface at the beginning of the implantation. RP UHM, HS (reprint author), USN,CTR SURFACE WARFARE,SILVER SPRING,MD 20903, USA. NR 13 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 0899-8221 J9 PHYS FLUIDS B-PLASMA PD NOV PY 1991 VL 3 IS 11 BP 3188 EP 3193 DI 10.1063/1.859799 PG 6 WC Physics, Fluids & Plasmas SC Physics GA GL828 UT WOS:A1991GL82800031 ER PT J AU AHLERS, ST THOMAS, JR BERKEY, DL AF AHLERS, ST THOMAS, JR BERKEY, DL TI HIPPOCAMPAL AND BODY-TEMPERATURE CHANGES IN RATS DURING DELAYED MATCHING-TO-SAMPLE PERFORMANCE IN A COLD ENVIRONMENT SO PHYSIOLOGY & BEHAVIOR LA English DT Article DE MEMORY; WORKING MEMORY; DELAYED MATCHING-TO-SAMPLE; COLD STRESS; HYPOTHERMIA; BIOTELEMETRY ID MODERATE COLD; MEMORY; HYPOTHERMIA; WATER; TASK; HYPERTHERMIA; EXPOSURE AB In order to study the effects of temperature changes induced by cold stress on working memory, telemetry thermistor probes were implanted into the hippocampal region of the brain and into the peritoneal cavity of rats. Temperatures in these regions were monitored while rats performed on a delayed matching-to-sample (DMTS) task at ambient temperatures of 23-degrees-C and 2-degrees-C. Matching accuracy was significantly decreased during exposure to 2-degrees-C, indicating a marked impairment of short-term or working memory. Temperature in the hippocampus increased 2-degrees-C during exposure to 23-degrees-C, but only 1-degrees-C when the environmental temperature was 2-degrees-C. Body temperature showed a similar but less pronounced pattern in that cold exposure attenuated the increase in temperature observed when animals performed the DMTS task. These results suggest that could-induced impairment of working memory may be associated with subtle temperature changes in the brain. RP USN, MED RES INST, DIV BEHAV NEUROSCI, THERMAL STRESS ADAPTAT PROGRAM, BETHESDA, MD 20889 USA. NR 37 TC 18 Z9 19 U1 0 U2 0 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLAND SN 0031-9384 J9 PHYSIOL BEHAV JI Physiol. Behav. PD NOV PY 1991 VL 50 IS 5 BP 1013 EP 1018 DI 10.1016/0031-9384(91)90430-V PG 6 WC Psychology, Biological; Behavioral Sciences SC Psychology; Behavioral Sciences GA GP919 UT WOS:A1991GP91900023 PM 1805262 ER PT J AU SANDERS, JT AF SANDERS, JT TI REVOLUTIONARY DREAMS - UTOPIAN VISION AND EXPERIMENTAL LIFE IN THE RUSSIAN-REVOLUTION - STITES,R SO PROBLEMS OF COMMUNISM LA English DT Book Review C1 USN ACAD,ANNAPOLIS,MD. NR 1 TC 0 Z9 0 U1 0 U2 1 PU US GOVERNMENT PRINTING OFFICE PI WASHINGTON PA SUPT OF DOCUMENTS, WASHINGTON, DC 20402-9325 SN 0032-941X J9 PROBL COMMUNISM PD NOV-DEC PY 1991 VL 40 IS 6 BP 115 EP 123 PG 9 WC Economics; Political Science SC Business & Economics; Government & Law GA HC268 UT WOS:A1991HC26800013 ER PT J AU GHANDEHARI, M AF GHANDEHARI, M TI POLAR DUALS OF CONVEX-BODIES SO PROCEEDINGS OF THE AMERICAN MATHEMATICAL SOCIETY LA English DT Article DE CONVEX BODY; POLAR DUAL; MIXED VOLUME; DUAL MIXED VOLUME ID INEQUALITY AB A generalization and the dual version of the following result due to Firey is given: The mixed area of a plane convex body and its polar dual is at least pi. We give a sharp upper bound for the product of the dual cross-sectional measure of any index and that of its polar dual. A general result for a convex body K and a convex increasing real-valued function gives inequalities for sets of constant width and sets with equichordal points as special cases. RP GHANDEHARI, M (reprint author), NAVAL POST GRAD SCH,DEPT MATH,MONTEREY,CA 93943, USA. NR 22 TC 12 Z9 15 U1 0 U2 0 PU AMER MATHEMATICAL SOC PI PROVIDENCE PA 201 CHARLES ST, PROVIDENCE, RI 02940-2213 SN 0002-9939 J9 P AM MATH SOC JI Proc. Amer. Math. Soc. PD NOV PY 1991 VL 113 IS 3 BP 799 EP 808 DI 10.2307/2048618 PG 10 WC Mathematics, Applied; Mathematics SC Mathematics GA GN943 UT WOS:A1991GN94300027 ER PT J AU NAKAYAMA, T SAMELSON, LE NAKAYAMA, Y MUNITZ, TI SHEARD, M JUNE, CH SINGER, A AF NAKAYAMA, T SAMELSON, LE NAKAYAMA, Y MUNITZ, TI SHEARD, M JUNE, CH SINGER, A TI LIGAND-STIMULATED SIGNALING EVENTS IN IMMATURE CD4+CD8+ THYMOCYTES EXPRESSING COMPETENT T-CELL RECEPTOR COMPLEXES SO PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA LA English DT Article ID MONOCLONAL-ANTIBODY; SURFACE EXPRESSION; IMPARTS REACTIVITY; TRANSGENIC MICE; ANTIGEN; DETERMINANT; CD4; TOLERANCE; RESPONSES; MOLECULE AB During thymic selection of the developing T-cell repertoire, the fate of individual CD4+CD8+ thymocytes is determined by the specificity of the T-cell antigen receptors (TCRs) they express. Paradoxically, most CD4+CD8+ thymocytes express few TCR molecules, and those they express are essentially incapable of transducing intracellular signals as measured by intracellular calcium mobilization. However, both TCR number and calcium-signaling capability are significantly induced in CD4+CD8+ thymocytes when the cells are released from intrathymic inhibitory signals that are mediated by their CD4 molecules. Here, the response to ligand engagement of TCR on "induced" CD4+CD8+ thymocytes that have been released from CD4-mediated inhibition was examined and was found to result in internalization of surface TCR complexes and rephosphorylation of zeta-chains of the TCR complex. In addition, a proportion of induced CD4+CD8+ thymocytes were found to fragment their DNA upon ligand engagement. Thus, this study describes early events in immature CD4+CD8+ thymocytes resulting from TCR-mediated signals. C1 NCI,EXPTL IMMUNOL BRANCH,BLDG 10,ROOM 4B-17,BETHESDA,MD 20892. NICHHD,CELL BIOL & METAB BRANCH,BETHESDA,MD 20892. NIDDKD,MOLEC CELLULAR NUTR ENDOCRINOL BRANCH,BETHESDA,MD 20892. USN,MED RES INST,IMMUNE CELL BIOL PROGRAM,BETHESDA,MD 20814. RI Nakayama, Toshinori/E-1067-2017 NR 28 TC 35 Z9 35 U1 0 U2 0 PU NATL ACAD SCIENCES PI WASHINGTON PA 2101 CONSTITUTION AVE NW, WASHINGTON, DC 20418 SN 0027-8424 J9 P NATL ACAD SCI USA JI Proc. Natl. Acad. Sci. U. S. A. PD NOV PY 1991 VL 88 IS 22 BP 9949 EP 9953 DI 10.1073/pnas.88.22.9949 PG 5 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA GP895 UT WOS:A1991GP89500009 PM 1719558 ER PT J AU KARLE, J AF KARLE, J TI DIRECT CALCULATION OF ATOMIC COORDINATES FROM DIFFRACTION INTENSITIES - SPACE GROUP P1 SO PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA LA English DT Article DE LEAST SQUARES; EXTENDED CONVERGENCE; GLOBAL MINIMA; REFINEMENT SPACE AB A method is presented that can extend the range of convergence for the least-squares minimization technique in nonlinear systems. The problem of determining directly the positions of atomic coordinates in a crystal from the measured intensities of x-ray scattering is used to illustrate the method. The minimization is facilitated by altering the minimization function in a way that reduces the number of false minima and, in addition, by altering the character of the false minima from time to time by changing the particular deck of data that is used and the values of a variety of parameters that may occur in the defining equations. With a structure consisting of 30 equal atoms in space group P1 and the use of exact data with a Cray XMP/216 computer, convergence to a global minimum was generally obtained, from a random positioning of the 90 coordinates, in a few minutes. Convergence within an hour for a 40-atom problem was much more sporadic, showing a considerable decrease in success with the increase in complexity. The possibility of extending the method to other mathematical systems is apparent. RP KARLE, J (reprint author), USN,RES LAB,STRUCT MATTER LAB,WASHINGTON,DC 20375, USA. FU NIGMS NIH HHS [GM30902] NR 4 TC 16 Z9 16 U1 1 U2 1 PU NATL ACAD SCIENCES PI WASHINGTON PA 2101 CONSTITUTION AVE NW, WASHINGTON, DC 20418 SN 0027-8424 J9 P NATL ACAD SCI USA JI Proc. Natl. Acad. Sci. U. S. A. PD NOV PY 1991 VL 88 IS 22 BP 10099 EP 10103 DI 10.1073/pnas.88.22.10099 PG 5 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA GP895 UT WOS:A1991GP89500040 PM 1946429 ER PT J AU KELLOGG, JC BOLLER, JR COMMISSO, RJ JENKINS, DJ FORD, RD LUPTON, WH SHIPMAN, JD AF KELLOGG, JC BOLLER, JR COMMISSO, RJ JENKINS, DJ FORD, RD LUPTON, WH SHIPMAN, JD TI TRIGGERED VACUUM FLASHOVER SWITCH FOR HIGH-POWER APPLICATIONS SO REVIEW OF SCIENTIFIC INSTRUMENTS LA English DT Article AB A command triggered, high-power, surface-flashover closing switch that operates in vacuum has been developed for use on a prototype inductive-storage pulsed power generator, Pawn. This vacuum flashover switch isolates the high-pressure-gas tamped wire fuse from a second opening switch. The switch consists of an insulating ring sandwiched between electrodes. Plasma and ultraviolet light from eight small spark discharges driven by a 5 keV pulse initiate a flashover across the switch insulator. The entire triggering unit resides inside one of Pawn's metallic conductors. The switch can be triggered after holding off voltage for congruent-to 15-mu-s. Normally, switch closure occurs at 22-45 kV. Time to closure at a voltage of congruent-to 30 kV is congruent-to 320 ns, with a typical jitter of +/- 50 ns. Peak current is typically congruent-to 1 MA. Current density in the switch is approximately 25 kA/cm2. The average risetime of the fuse output current pulse can be varied by a factor of 2 by triggering the switch at different closing voltages. C1 SAIC,SHALIMAR,FL 32579. JAYCOR,VIENNA,VA 22180. SFA INCORP,LANDOVER,MD 20785. RP KELLOGG, JC (reprint author), USN,RES LAB,DIV PLASMA PHYS,WASHINGTON,DC 20375, USA. NR 12 TC 4 Z9 9 U1 0 U2 1 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0034-6748 J9 REV SCI INSTRUM JI Rev. Sci. Instrum. PD NOV PY 1991 VL 62 IS 11 BP 2689 EP 2694 DI 10.1063/1.1142201 PG 6 WC Instruments & Instrumentation; Physics, Applied SC Instruments & Instrumentation; Physics GA GN773 UT WOS:A1991GN77300029 ER PT J AU LEAN, J AF LEAN, J TI VARIATIONS IN THE SUNS RADIATIVE OUTPUT SO REVIEWS OF GEOPHYSICS LA English DT Review ID SOLAR IRRADIANCE VARIATIONS; LYMAN ALPHA-FLUX; CONSTANT SECULAR CHANGES; ACTIVE REGIONS; ULTRAVIOLET IRRADIANCE; UV FLUX; NORTHERN-HEMISPHERE; TEMPORAL VARIATIONS; CLIMATE CHANGE; TIME SCALES AB By how much does the Sun's radiation vary? Although the Sun has long been an object of immense fascination, fundamental information about the magnitude and variability of its radiative output, sought for over a century, is only now approaching a level satisfactory for geophysical applications. During the past decade, satellite instruments have measured, simultaneously, both the Sun's spectrally integrated radiative output and its ultraviolet spectrum. These data have been analyzed in terms of their relationships to ground-based observations that characterize different aspects of the Sun's 11-year activity cycle, allowing estimates of solar radiative output variations over times scales from days to decades and interpretations of these variations in the broader context of the variable Sun. Uncertainties still remain to be answered by the next generation of solar radiometers, which commenced observations with the launch of the Upper Atmosphere Research Satellite in September 1991, near the maximum of solar cycle 22. RP LEAN, J (reprint author), USN,RES LAB,EO HULBURT CTR SPACE RES,WASHINGTON,DC 20375, USA. OI Lean, Judith/0000-0002-0087-9639 NR 147 TC 205 Z9 208 U1 2 U2 5 PU AMER GEOPHYSICAL UNION PI WASHINGTON PA 2000 FLORIDA AVE NW, WASHINGTON, DC 20009 SN 8755-1209 J9 REV GEOPHYS JI Rev. Geophys. PD NOV PY 1991 VL 29 IS 4 BP 505 EP 535 DI 10.1029/91RG01895 PG 31 WC Geochemistry & Geophysics SC Geochemistry & Geophysics GA GR588 UT WOS:A1991GR58800002 ER PT J AU ROLAND, CM PENG, KL AF ROLAND, CM PENG, KL TI ELECTRICAL-CONDUCTIVITY IN RUBBER DOUBLE NETWORKS SO RUBBER CHEMISTRY AND TECHNOLOGY LA English DT Article ID STYRENE-BUTADIENE RUBBER; BLACK-LOADED RUBBER; FEF CARBON-BLACK; FILLED RUBBER; PRE-EXTENSION; TEMPERATURE; BEHAVIOR; DEPENDENCE RP ROLAND, CM (reprint author), USN,RES LAB,DIV CHEM,CODE 6120,WASHINGTON,DC 20375, USA. NR 42 TC 29 Z9 29 U1 0 U2 3 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 NOV-DEC PY 1991 VL 64 IS 5 BP 790 EP 800 DI 10.5254/1.3538591 PG 11 WC Polymer Science SC Polymer Science GA HR133 UT WOS:A1991HR13300010 ER PT J AU LUSTMAN, L NETA, B KATTI, CP AF LUSTMAN, L NETA, B KATTI, CP TI SOLUTION OF LINEAR-SYSTEMS OF ORDINARY DIFFERENTIAL-EQUATIONS ON AN INTEL HYPERCUBE SO SIAM JOURNAL ON SCIENTIFIC AND STATISTICAL COMPUTING LA English DT Note DE INITIAL VALUE PROBLEMS; PARALLEL PROCESSING; HYPERCUBE; BOX SCHEME; RECURSIVE DOUBLING AB In this paper there is developed and tested a parallel scheme for the solution of linear systems of ordinary initial value problems based on the box scheme and a modified recursive doubling technique. The box scheme may be replaced by any stable integrator. The algorithm can be modified to solve boundary value problems. Software for both problems is available upon request. C1 JAWAHARLA NEHRU UNIV,SCH COMP & SYST SCI,NEW DELHI 110067,INDIA. RP LUSTMAN, L (reprint author), NAVAL POST GRAD SCH,DEPT MATH,MONTEREY,CA 93943, USA. RI Neta, Beny/B-1737-2009 NR 7 TC 3 Z9 3 U1 0 U2 0 PU SIAM PUBLICATIONS PI PHILADELPHIA PA 3600 UNIV CITY SCIENCE CENTER PH#382-9800, PHILADELPHIA, PA 19104-2688 SN 0196-5204 J9 SIAM J SCI STAT COMP PD NOV PY 1991 VL 12 IS 6 BP 1480 EP 1485 DI 10.1137/0912081 PG 6 WC Mathematics, Applied SC Mathematics GA GK840 UT WOS:A1991GK84000015 ER PT J AU CULHANE, JL HIEI, E DOSCHEK, GA CRUISE, AM OGAWARA, Y UCHIDA, Y BENTLEY, RD BROWN, CM LANG, J WATANABE, T BOWLES, JA DESLATTES, RD FELDMAN, U FLUDRA, A GUTTRIDGE, P HENINS, A LAPINGTON, J MAGRAW, J MARISKA, JT PAYNE, J PHILLIPS, KJH SHEATHER, P SLATER, K TANAKA, K TOWNDROW, E TROW, MW YAMAGUCHI, A AF CULHANE, JL HIEI, E DOSCHEK, GA CRUISE, AM OGAWARA, Y UCHIDA, Y BENTLEY, RD BROWN, CM LANG, J WATANABE, T BOWLES, JA DESLATTES, RD FELDMAN, U FLUDRA, A GUTTRIDGE, P HENINS, A LAPINGTON, J MAGRAW, J MARISKA, JT PAYNE, J PHILLIPS, KJH SHEATHER, P SLATER, K TANAKA, K TOWNDROW, E TROW, MW YAMAGUCHI, A TI THE BRAGG CRYSTAL SPECTROMETER FOR SOLAR-A SO SOLAR PHYSICS LA English DT Article ID X-RAY-SPECTRA; HINOTORI SATELLITE; FLARES AB The Bragg Crystal Spectrometer (BCS) is one of the instruments which makes up the scientific payload of the SOLAR-A mission. The spectrometer employs four bent germanium crystals, views the whole Sun and observes the resonance line complexes of H-like Fe XXVI and He-like XXV, Ca XIX, and S XV in four narrow wavelength ranges with a resolving Power (lambda/DELTA-lambda) of between 3000 and 6000. The spectrometer has approaching ten times better sensitivity than that of previous instruments thus permitting a time resolution of better than 1 s to be achieved. The principal aim is the measurement of the properties of the 10 to 50 million K plasma created in solar flares with special emphasis on the heating and dynamics of the plasma during the impulsive phase. This paper summarizes the scientific objectives of the BCS and describes the design, characteristics, and performance of the spectrometers. C1 NATL ASTRON OBSERV JAPAN, TOKYO, JAPAN. USN, RES LAB, WASHINGTON, DC 20375 USA. RUTHERFORD APPLETON LAB, ABINGDON, ENGLAND. INST SPACE & ASTRONAUT SCI, TOKYO 153, JAPAN. UNIV TOKYO, TOKYO 113, JAPAN. NATL INST STAND & TECHNOL, WASHINGTON, DC USA. RP CULHANE, JL (reprint author), UCL, MULLARD SPACE SCI LAB, HOLMBURY, ENGLAND. RI Lapington, Jon/A-7669-2012 NR 18 TC 184 Z9 185 U1 1 U2 8 PU SPRINGER PI DORDRECHT PA VAN GODEWIJCKSTRAAT 30, 3311 GZ DORDRECHT, NETHERLANDS SN 0038-0938 J9 SOL PHYS JI Sol. Phys. PD NOV PY 1991 VL 136 IS 1 BP 89 EP 104 DI 10.1007/BF00151696 PG 16 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA GU809 UT WOS:A1991GU80900006 ER PT J AU SOULEN, RJ AF SOULEN, RJ TI A BRIEF-HISTORY OF THE DEVELOPMENT OF TEMPERATURE SCALES - THE CONTRIBUTIONS OF FAHRENHEIT AND KELVIN SO SUPERCONDUCTOR SCIENCE & TECHNOLOGY LA English DT Article AB As a contribution to the special Kelvin symposium at ISEC, I will describe the very different contributions that Fahrenheit and Kelvin made to the development of temperature scales. I will show that Fahrenheit's approach was very literal and was not based on a fundamental approach, but nevertheless was the ultimate refinement of a tradition started in ancient Greece. Kelvin's approach on the other hand was a true departure from tradition and was born from fundamental considerations based on fresh developments in thermodynamics. RP SOULEN, RJ (reprint author), USN,RES LAB,DIV MAT SCI & TECHNOL,WASHINGTON,DC 20375, USA. NR 6 TC 0 Z9 0 U1 2 U2 6 PU IOP PUBLISHING LTD PI BRISTOL PA TECHNO HOUSE, REDCLIFFE WAY, BRISTOL, ENGLAND BS1 6NX SN 0953-2048 J9 SUPERCOND SCI TECH JI Supercond. Sci. Technol. PD NOV PY 1991 VL 4 IS 11 BP 696 EP 699 DI 10.1088/0953-2048/4/11/040 PG 4 WC Physics, Applied; Physics, Condensed Matter SC Physics GA HA193 UT WOS:A1991HA19300041 ER PT J AU KONNERT, J DANTONIO, P AF KONNERT, J DANTONIO, P TI UTILIZATION OF STEM NANODIFFRACTION DATA SO ULTRAMICROSCOPY LA English DT Article ID OVERLAPPING REGIONS; ELECTRON; SCATTERING; PATTERNS; IMAGES AB A scanning transmission electron microscope (STEM) designed to simultaneously record all of the diffraction data at each beam position is necessary to fully utilize the imaging potential of a STEM. However, analysis of this large quantity of data requires considerable computation that should be undertaken only with the assurance that the data were collected under near optimum conditions from the desired region of the sample. This paper develops equations for the total elastic scattering produced with a small, coherent electron beam incident on a thin sample. These equations are used as the basis for simulations which indicate that high-angle annular-dark-field (ADF) images may be used to indicate the quality of the diffraction data. When the microscope is adjusted such that the portion of the data falling within a high-angle annulus forms a real-time high-resolution image with 2.5 angstrom resolution or better, the simultaneously recorded nanodiffraction data are suitable for the reconstruction of images possessing 1 angstrom resolution or better. While the resolution of the ADF image is determined by the electron beam size, the coherent nanodiffraction data contain structural information for each beam position to the resolution limit of the diffraction pattern. RP KONNERT, J (reprint author), USN,RES LAB,STRUCT MATTER LAB,WASHINGTON,DC 20375, USA. NR 8 TC 2 Z9 2 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0304-3991 J9 ULTRAMICROSCOPY JI Ultramicroscopy PD NOV PY 1991 VL 38 IS 2 BP 169 EP 179 DI 10.1016/0304-3991(91)90118-P PG 11 WC Microscopy SC Microscopy GA GT320 UT WOS:A1991GT32000007 ER PT J AU FRAZIER, HA GEARHART, JP AF FRAZIER, HA GEARHART, JP TI FAMILIAL REFLUX - VESICOURETERAL REFLUX IN ALL SIBLINGS OF A FAMILY SO UROLOGY LA English DT Article ID URINARY-TRACT INFECTION; CHILDREN AB A family is presented in which 4 of 4 (100%) siblings demonstrate vesicoureteral reflux on voiding cystogram. Mechanisms of inheritance are reviewed. C1 JOHNS HOPKINS UNIV HOSP,JAMES BUCHANAN BRADY UROL INST,DIV PEDIAT UROL,BALTIMORE,MD 21205. USN HOSP,DEPT UROL,BETHESDA,MD 20814. NR 21 TC 1 Z9 1 U1 0 U2 0 PU CAHNERS PUBL CO PI NEW YORK PA 249 WEST 17 STREET, NEW YORK, NY 10011 SN 0090-4295 J9 UROLOGY JI UROLOGY PD NOV PY 1991 VL 38 IS 5 BP 453 EP 456 DI 10.1016/0090-4295(91)80237-2 PG 4 WC Urology & Nephrology SC Urology & Nephrology GA GP380 UT WOS:A1991GP38000013 PM 1949458 ER PT J AU ORTIZ, JV MINTMIRE, JW AF ORTIZ, JV MINTMIRE, JW TI GROUND-STATE AND VERTICAL IONIZATION ENERGIES VERSUS SI-SI-SI AND C-C-C BOND ANGLES IN SI3H8 AND C3H8 SO JOURNAL OF PHYSICAL CHEMISTRY LA English DT Article ID POLYSILANE HIGH POLYMERS; ORGANOSILANE HIGH POLYMERS; ELECTRON PROPAGATOR THEORY; MECHANISM; MOLECULES; ABINITIO; POLY(DI-NORMAL-ALKYLSILANES); POLY(DI-NORMAL-HEXYLSILANE); ORGANOPOLYSILANES; PHOTODEGRADATION AB Geometry-optimized ground-state energies of Si3H8 are calculated as a function of Si-Si-Si bond angle from 109.471-degrees to 120-degrees with the 6-31G(d) basis and second-order many-body perturbation theory. A structure with the Si-Si-Si angle equal to 120-degrees lies 0.44 kcal/mol higher than the global minimum. Effects on vertical ionization energies are calculated with electron propagator theory. The same bond angle distortion causes the vertical ionization energy to the 2B2 final state to increase by 0.09 eV, while the vertical ionization energy to the 2A1 final state decreases by the same amount. When the same procedures are applied to C3H8, the ground-state energy change accompanying the bond angle distortion is 1.29 kcal/mol. Three cation final states are very close at the equilibrium geometry of the neutral. Distortion of the C-C-C angle to 120-degrees causes the 2B2 ionization energy to increase by 0.22 eV, the 2A1 ionization energy to decrease by 0.21 eV, and the 2B1 ionization energy to decrease by 0.15 eV. Good agreement with experiment is obtained in the propagator calculations on vertical ionization energies for molecules in their equilibrium geometries. Contour plots and expectation values of the Feynman-Dyson amplitudes provide an interpretation of the ionization energy trends. C1 USN,RES LAB,DIV CHEM,WASHINGTON,DC 20375. RP ORTIZ, JV (reprint author), UNIV NEW MEXICO,DEPT CHEM,ALBUQUERQUE,NM 87131, USA. OI Mintmire, John/0000-0002-6551-0349 NR 46 TC 13 Z9 13 U1 0 U2 1 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0022-3654 J9 J PHYS CHEM-US JI J. Phys. Chem. PD OCT 31 PY 1991 VL 95 IS 22 BP 8609 EP 8613 DI 10.1021/j100175a036 PG 5 WC Chemistry, Physical SC Chemistry GA GX469 UT WOS:A1991GX46900036 ER PT J AU BALLA, RJ CASLETON, KH ADAMS, JS PASTERNACK, L AF BALLA, RJ CASLETON, KH ADAMS, JS PASTERNACK, L TI ABSOLUTE RATE CONSTANTS FOR THE REACTION OF CN WITH CH4, C2H6, AND C3H8 FROM 292-K TO 1500-K USING HIGH-TEMPERATURE PHOTOCHEMISTRY AND DIODE-LASER ABSORPTION SO JOURNAL OF PHYSICAL CHEMISTRY LA English DT Article ID THERMAL-DECOMPOSITION; SHOCK-TUBE; KINETICS; BANDS; HCN; SPECTROSCOPY; CYANOGEN; PHOTODISSOCIATION; DISSOCIATION; OXIDATION AB By combining the laser-induced fluorescence detection technique with high-temperature reactor technology, absolute rate constants for the reaction of CN with CH4, C2H6, and C3H8 have been measured as a function of temperature (292-1500 K) and pressure (5-60 Torr). CN radicals were generated by 193-nm excimer laser photolysis of dilute C2N2/Ar mixtures. Radical decays were monitored by laser-induced fluorescence from the B2-SIGMA+ <-- X2-SIGMA+ transition near 387 nm under pseudo-first-order conditions. Arrhenius plots of the rate constants show significant curvature. The temperature-dependent rate constants have been fit to modified Arrhenius expressions of the form k = AT(n) exp(-E/T). This study represents the widest continuous temperature range over which rate constants for these reactions have been measured directly. The reaction kinetics and products of these reactions were also studied at 295 K by diode laser absorption. Rate constants obtained from product growth are in good agreement with the laser-induced fluorescence data. For these reactions at 295 K, HCN was found to be the dominant observable product. C1 US DOE,MORGANTOWN ENERGY TECHNOL CTR,POB 880,MORGANTOWN,WV 26507. USN,RES LAB,DIV CHEM,WASHINGTON,DC 20375. NR 44 TC 37 Z9 37 U1 1 U2 7 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0022-3654 J9 J PHYS CHEM-US JI J. Phys. Chem. PD OCT 31 PY 1991 VL 95 IS 22 BP 8694 EP 8701 DI 10.1021/j100175a051 PG 8 WC Chemistry, Physical SC Chemistry GA GX469 UT WOS:A1991GX46900051 ER PT J AU PASTERNACK, L RICE, JK AF PASTERNACK, L RICE, JK TI ALH GAS-PHASE REACTION-KINETICS SO JOURNAL OF PHYSICAL CHEMISTRY LA English DT Article ID ELECTRON-SPIN RESONANCE; ISOLATED ALUMINUM ATOMS; PHOTOCHEMICAL-REACTIONS; MOLECULAR-HYDROGEN; MATRIX-ISOLATION; ALXGA1-XAS; COMPLEXES; ETHYLENE; BH; ENERGIES AB The reactions of ground-state AlH (1-SIGMA+) with O2, H2O, H-2, D2, C3H8, C2H2, 2-butyne, C2H4 and 2-methyl-2-butene are investigated at 300 K. The AlH is produced by the photodissociation of triethylaluminum at 193 or 248 nm and detected by laser-induced fluorescence of the A I-PI-X 1-SIGMA+ transition. Absolute bimolecular rate constants are obtained from AlH concentration decay profiles as a function of reactant gas concentration. The rate constants for oxygen containing reactants reported in units of cm3 s-1 are (1.58 +/- 0.15) x 10(-12) for O2 and (3.09 +/- 0.35) x 10(-11) for H2O. For H-2 and D2, we are unable to observe reactions with AlH at low pressures; we report an upper limit of 1 x 10(-14) cm3 s-1 at 20 Torr of total pressure. The reaction of AlH + D2 is dependent on the total pressure; at 460 Torr we observe AlH depletion with a rate constant of (1.4 +/- 0.2) x 10(-14) cm3 s-1. The saturated hydrocarbon reactant, C3H8, also reacts with a rate constant < 1 x 10(-14) cm3 s-1. Unsaturated hydrocarbons exhibit very rapid rates of reaction. C2H2 and the methyl substituted, 2-butyne species have rate constants of (1.12 +/- 0.11) X 10(-10) and (2.51 +/- 0.3 1) x 10(-10) cm3 s-1, respectively. The C2H4 and methyl-substituted, 2-methyl-2-butene species have rate constants of (2.21 +/- 0.19) x 10(-11) and (1.5 +/- 0.17) x 10(-11) cm3 s-1, respectively. Comparisons of AlH reaction rates are made with those of the isovalent BH species, Al atoms, and the isoelectronic Si atom. RP PASTERNACK, L (reprint author), USN,RES LAB,DIV CHEM,CODE 6111,WASHINGTON,DC 20375, USA. NR 45 TC 5 Z9 5 U1 1 U2 3 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0022-3654 J9 J PHYS CHEM-US JI J. Phys. Chem. PD OCT 31 PY 1991 VL 95 IS 22 BP 8701 EP 8706 DI 10.1021/j100175a052 PG 6 WC Chemistry, Physical SC Chemistry GA GX469 UT WOS:A1991GX46900052 ER PT J AU DUNLAP, BI BRENNER, DW MINTMIRE, JW MOWREY, RC WHITE, CT AF DUNLAP, BI BRENNER, DW MINTMIRE, JW MOWREY, RC WHITE, CT TI LOCAL DENSITY FUNCTIONAL ELECTRONIC-STRUCTURES OF 3 STABLE ICOSAHEDRAL FULLERENES SO JOURNAL OF PHYSICAL CHEMISTRY LA English DT Article ID CARBON; C-60; MOLECULES; SYMMETRY; GRAPHITE; CLUSTERS; SPECTRA; STATES; FORM; BAND AB Local density functional (LDF) electronic structures of icosahedral C60, C180, and C240 are compared. These molecules are remarkably similar, and nothing is found to suggest that the two larger molecules are less stable than C60. Ionization potentials are calculated by using both the transition-state approximation and differences between self-consistent-field calculations. Comparing these with one-electron eigenvalues supports the interpretation of photoelectron line shapes using theoretical cross sections calculated from LDF one-electron states of these large, highly symmetric molecules. RP DUNLAP, BI (reprint author), USN,RES LAB,THEORET CHEM SECT,CODE 6119,WASHINGTON,DC 20375, USA. RI Brenner, Donald/D-1741-2009; OI Dunlap, Brett/0000-0003-1356-6559 NR 39 TC 83 Z9 84 U1 1 U2 3 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0022-3654 J9 J PHYS CHEM-US JI J. Phys. Chem. PD OCT 31 PY 1991 VL 95 IS 22 BP 8737 EP 8741 DI 10.1021/j100175a058 PG 5 WC Chemistry, Physical SC Chemistry GA GX469 UT WOS:A1991GX46900058 ER PT J AU STANTON, CT GARLAND, NL NELSON, HH AF STANTON, CT GARLAND, NL NELSON, HH TI TEMPERATURE-DEPENDENCE OF THE KINETICS OF THE REACTION BO+O2 SO JOURNAL OF PHYSICAL CHEMISTRY LA English DT Article ID ENERGIES; BORON AB The temperature and pressure dependence of the rate constant for the reaction of BO + O2 is investigated in a high-temperature flow reactor. BO is generated by photolysis of BCl2(OCH3) and detected by laser-induced fluorescence. Rate constants are obtained by monitoring the decay of the BO signal as a function of added O2 pressure. The rate constant at room temperature is (1.94 +/- 0.18) x 10(-11) cm3 s-1 and is found to be pressure independent between 20 and 200 Torr. The temperature dependence of the rate constant between 300 and 1000 K can be represented by the Arrhenius expression k(T) = (7.0 +/- 0.6) x 10(-12) cm3 s-1 exp[(0.51 +/- 0.08 kcal mol-1)/RT]. A mechanism involving formation of a BO3 adduct with subsequent decomposition to BO2 + O is proposed to account for the observed negative temperature dependence. C1 USN,RES LAB,DIV CHEM,CODE 6110,WASHINGTON,DC 20375. NR 19 TC 17 Z9 17 U1 0 U2 2 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0022-3654 J9 J PHYS CHEM-US JI J. Phys. Chem. PD OCT 31 PY 1991 VL 95 IS 22 BP 8741 EP 8744 DI 10.1021/j100175a059 PG 4 WC Chemistry, Physical SC Chemistry GA GX469 UT WOS:A1991GX46900059 ER PT J AU CONRATH, BJ GAUTIER, D LINDAL, GF SAMUELSON, RE SHAFFER, WA AF CONRATH, BJ GAUTIER, D LINDAL, GF SAMUELSON, RE SHAFFER, WA TI THE HELIUM ABUNDANCE OF NEPTUNE FROM VOYAGER MEASUREMENTS SO JOURNAL OF GEOPHYSICAL RESEARCH-PLANETS LA English DT Article ID RADIO OCCULTATION MEASUREMENTS; OUTER SOLAR-SYSTEM; GIANT PLANETS; PARA-HYDROGEN; MONODEUTERATED METHANE; DEEP ATMOSPHERE; D/H RATIO; ELEMENTS; URANUS; SPECTRUM AB Voyager radio occultation and infrared spectrometer measurements are used to obtain an estimate of the helium abundance in the atmosphere of Neptune. It is found that the shape of the measured spectrum cannot be well matched by spectra calculated from atmospheric models that include only gaseous opacity. The most plausible explanation of the observed spectral shape appears to require the existence of an additional opacity source associated with clouds or hazes. The data can be fit with either a tropospheric or a stratospheric cloud model. If a tropospheric cloud is invoked, an optical thickness at 200 cm-1 between 1 and 8 is required, depending on the particle size assumed. For a stratospheric cloud an optical thickness between 0.2 and 0.8 is required. Optical constants for methane ice are used, but ethane has similar optical properties in this spectral region. Assuming no modification to the temperature profile is required other than a molecular weight adjustment, a combination of gas and cloud opacities produces a good fit to the spectrum for a helium mole fraction q(He) = 0.190 +/- 0.032, corresponding to a mass fraction Y = 0.32 +/- 0.05. Within the measurement uncertainties the Neptune helium abundance may be compatible with that of Uranus and, marginally, with the protosolar value. However, models in which the outer part of the primitive solar nebular was enriched in CO and N2, leading to an enhanced atmospheric He/H-2 ratio, cannot be ruled out at this time. C1 OBSERV PARIS,SECT MEUDON,DEPT RECH SPATIALE,F-92195 MEUDON,FRANCE. CALTECH,JET PROP LAB,PASADENA,CA 91109. USN,RES LAB,WASHINGTON,DC 20375. RP CONRATH, BJ (reprint author), NASA,GODDARD SPACE FLIGHT CTR,CODE 693-2,GREENBELT,MD 20771, USA. NR 59 TC 56 Z9 56 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-PLANET JI J. Geophys. Res.-Planets PD OCT 30 PY 1991 VL 96 SU S BP 18907 EP 18919 PG 13 WC Geochemistry & Geophysics SC Geochemistry & Geophysics GA GQ712 UT WOS:A1991GQ71200002 ER PT J AU TSAI, TE GRISCOM, DL AF TSAI, TE GRISCOM, DL TI EXPERIMENTAL-EVIDENCE FOR EXCITONIC MECHANISM OF DEFECT GENERATION IN HIGH-PURITY SILICA SO PHYSICAL REVIEW LETTERS LA English DT Article ID SI-29 HYPERFINE-STRUCTURE; E' CENTER; ELECTRONIC EXCITATION; LATTICE-DEFECTS; GLASSY SIO2; CREATION; DIOXIDE; A-SIO2 AB Direct evidence for the creation of oxygen-vacancy, oxygen-interstitial pairs in SiO2 glasses by an excitonic mechanism is developed from an electron-spin-resonance study of high-purity fused silicas exposed to highly focused 6.4-eV excimer laser light. C1 USN,RES LAB,WASHINGTON,DC 20375. NR 29 TC 134 Z9 135 U1 1 U2 12 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0031-9007 J9 PHYS REV LETT JI Phys. Rev. Lett. PD OCT 28 PY 1991 VL 67 IS 18 BP 2517 EP 2520 DI 10.1103/PhysRevLett.67.2517 PG 4 WC Physics, Multidisciplinary SC Physics GA GL801 UT WOS:A1991GL80100029 ER PT J AU JACKSON, KA PEDERSON, MR AF JACKSON, KA PEDERSON, MR TI NEW THEORETICAL-MODEL FOR THE DIAMOND 1S CORE EXCITON SO PHYSICAL REVIEW LETTERS LA English DT Article AB The binding energy of the diamond 1s core exciton has a measured value of 0.2 eV, in marked contrast to the 1.7-eV binding energy of the physically similar nitrogen donor in diamond. Using the local-density approximation to study the core exciton, we find the shallow exciton binding energy is explained by dipole selection rules which prohibit occupation of a deep exciton gap state in single-photon excitation. This deep state has not yet been observed experimentally, and the calculation predicts a binding energy in the range of 0.8-1.7 eV. C1 USN, RES LAB, DIV CONDENSED MATTER & RADIAT SCI, COMPLEX SYST THEORY BRANCH, WASHINGTON, DC 20375 USA. RP GEORGE MASON UNIV, FAIRFAX, VA 22030 USA. OI Jackson, Koblar/0000-0002-5342-7978 NR 13 TC 29 Z9 29 U1 0 U2 2 PU AMER PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0031-9007 EI 1079-7114 J9 PHYS REV LETT JI Phys. Rev. Lett. PD OCT 28 PY 1991 VL 67 IS 18 BP 2521 EP 2524 DI 10.1103/PhysRevLett.67.2521 PG 4 WC Physics, Multidisciplinary SC Physics GA GL801 UT WOS:A1991GL80100030 ER PT J AU RUCKMAN, MW CHEN, J QIU, SL KUIPER, P STRONGIN, M DUNLAP, BI AF RUCKMAN, MW CHEN, J QIU, SL KUIPER, P STRONGIN, M DUNLAP, BI TI INTERPRETING THE NEAR EDGES OF O2 AND O2- IN ALKALI-METAL SUPEROXIDES SO PHYSICAL REVIEW LETTERS LA English DT Article ID N-2; O-2; NO AB Depositing alkali metal into a molecular oxygen layer dispersed on a Kr film produces alkali-metal superoxides containing the O2- species for photoemission and near-edge study. The oxygen K-edge spectrum of LiO2, KO2, and CsO2 is in good agreement with theoretical calculations for the free O2- ion. The O K edge for the superoxide strongly resembles that observed for O2 which is nondissociatively adsorbed on a metal surface. C1 USN,RES LAB,THEORET CHEM SECT,WASHINGTON,DC 20375. RP RUCKMAN, MW (reprint author), BROOKHAVEN NATL LAB,DEPT PHYS,UPTON,NY 11973, USA. RI Kuiper, Pieter/A-6806-2012; OI Dunlap, Brett/0000-0003-1356-6559 NR 19 TC 45 Z9 45 U1 0 U2 10 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0031-9007 J9 PHYS REV LETT JI Phys. Rev. Lett. PD OCT 28 PY 1991 VL 67 IS 18 BP 2533 EP 2536 DI 10.1103/PhysRevLett.67.2533 PG 4 WC Physics, Multidisciplinary SC Physics GA GL801 UT WOS:A1991GL80100033 ER PT J AU SIMANJUNTAK, CH PALEOLOGO, FP PUNJABI, NH DARMOWIGOTO, R TOTOSUDIRJO, SH HARYANTO, P SUPRIJANTO, E WITHAM, ND HOFFMAN, SL AF SIMANJUNTAK, CH PALEOLOGO, FP PUNJABI, NH DARMOWIGOTO, R TOTOSUDIRJO, SH HARYANTO, P SUPRIJANTO, E WITHAM, ND HOFFMAN, SL TI ORAL IMMUNIZATION AGAINST TYPHOID-FEVER IN INDONESIA WITH TY21A VACCINE SO LANCET LA English DT Article ID CONTROLLED FIELD TRIAL; VI-CAPSULAR POLYSACCHARIDE; ENTERIC-COATED CAPSULES; SALMONELLA-TYPHI; TY 21A; LIVE; FORMULATION; IMMUNITY; STRAIN AB When tested under conditions of moderate transmission of typhoid fever, a liquid formulation of the oral typhoid fever vaccine Ty21 a had a protective efficacy of 96% in Egypt, and an enteric coated capsule formulation had an efficacy of 67% in Chile. We compared the two formulations under conditions of intense transmission of typhoid fever in Indonesia in a randomised, double-blind trial. 20 543 subjects (age range 3-44 years) received either three doses of enteric coated capsules containing placebo or live Ty21 a, or three doses of lyophilised placebo or live Ty21 a reconstituted with phosphate buffer. During 30 months of follow-up, the rate of blood-culture-positive typhoid fever among controls was 810/100 000 per year. Rates of typhoid fever were 379/100 00 per year for subjects who received the liquid formulation of vaccine and 468/100000 per year for subjects who received enteric coated capsules. The protective efficacies of the liquid and enteric coated formulations were 53% and 42%, respectively. Neither formulation protected against infection with Salmonella paratyphi A. No major side-effects were noted, but the overall incidence of side-effects was greater in the vaccine groups. Under conditions of intense transmission, Ty21 a protected against typhoid fever; however, because Ty21 a will not protect all individuals, there is a need for additional approaches to prevent the disease. C1 PERTAMINA OIL CO,DEPT PUBL HLTH,JAKARTA,INDONESIA. USN,MED RES UNIT 2,JAKARTA DETACHMENT,JAKARTA,INDONESIA. PERTAMINA OIL CO,DEPT PUBL HLTH,PLAJU,INDONESIA. USN,MED RES INST,MALARIA PROGRAM,BETHESDA,MD 20814. RP SIMANJUNTAK, CH (reprint author), MINIST HLTH,NATL INST HLTH RES & DEV,CTR INFECT DIS RES,JALAN PERCETAKAN NEGARA 29,JAKARTA 10560,INDONESIA. NR 24 TC 145 Z9 146 U1 1 U2 8 PU LANCET LTD PI LONDON PA 42 BEDFORD SQUARE, LONDON, ENGLAND WC1B 3SL SN 0140-6736 J9 LANCET JI Lancet PD OCT 26 PY 1991 VL 338 IS 8774 BP 1055 EP 1059 DI 10.1016/0140-6736(91)91910-M PG 5 WC Medicine, General & Internal SC General & Internal Medicine GA GM253 UT WOS:A1991GM25300013 PM 1681365 ER PT J AU HSU, DSY AF HSU, DSY TI 50-NM LINEWIDTH PLATINUM SIDEWALL LITHOGRAPHY BY EFFUSIVE-SOURCE METAL PRECURSOR CHEMICAL-DEPOSITION AND ION-ASSISTED ETCHING SO APPLIED PHYSICS LETTERS LA English DT Article AB Vertical platinum sidewall structures 50 nm thick and 700 nm tall have been fabricated by Pt deposition from the thermal decomposition of tetrakis-(trifluorophosphine)-platinum using an effusive gas source followed by ion-assisted etching. Scanning electron microscope micrographs show that the sidewalls have high uniformity, very fine grains, and very sharp contours, demonstrating a high degree of conformal deposition. Scanning Auger microscopy confirms the presence of platinum only in the sidewalls. X-ray photoelectron spectroscopy analysis of the as-deposited platinum film reveals no detectable impurity and Scotch tape test shows good bonding of the film. The method is suitable to large-scale processing. RP HSU, DSY (reprint author), USN,RES LAB,DIV CHEM,CHEM DYNAM & DIAGNOST BRANCH,SURFACE REACT DYNAM SECT,CODE 6114,WASHINGTON,DC 20375, USA. NR 10 TC 10 Z9 10 U1 0 U2 2 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0003-6951 J9 APPL PHYS LETT JI Appl. Phys. Lett. PD OCT 21 PY 1991 VL 59 IS 17 BP 2192 EP 2194 DI 10.1063/1.106070 PG 3 WC Physics, Applied SC Physics GA GK727 UT WOS:A1991GK72700043 ER PT J AU BULSARA, A JACOBS, EW ZHOU, T MOSS, F KISS, L AF BULSARA, A JACOBS, EW ZHOU, T MOSS, F KISS, L TI STOCHASTIC RESONANCE IN A SINGLE NEURON MODEL - THEORY AND ANALOG SIMULATION SO JOURNAL OF THEORETICAL BIOLOGY LA English DT Article ID NONLINEAR DYNAMIC SYSTEM; BISTABLE SYSTEM; CLIMATIC TRANSITIONS; NOISE; NETWORKS; CHAOS; FLUCTUATIONS; EQUATION C1 UNIV MISSOURI, DEPT PHYS, ST LOUIS, MO 63121 USA. JOZEF ATTILA TUD EGYET, INST PHYS, H-6720 SZEGED, HUNGARY. RP BULSARA, A (reprint author), USN, CTR OCEAN SYST, SAN DIEGO, CA 92152 USA. NR 50 TC 161 Z9 162 U1 1 U2 13 PU ACADEMIC PRESS LTD PI LONDON PA 24-28 OVAL RD, LONDON, ENGLAND NW1 7DX SN 0022-5193 J9 J THEOR BIOL JI J. Theor. Biol. PD OCT 21 PY 1991 VL 152 IS 4 BP 531 EP 555 DI 10.1016/S0022-5193(05)80396-0 PG 25 WC Biology; Mathematical & Computational Biology SC Life Sciences & Biomedicine - Other Topics; Mathematical & Computational Biology GA GN175 UT WOS:A1991GN17500006 PM 1758197 ER PT J AU DEVEAUD, B CLEROT, F ROY, N SATZKE, K SERMAGE, B KATZER, DS AF DEVEAUD, B CLEROT, F ROY, N SATZKE, K SERMAGE, B KATZER, DS TI ENHANCED RADIATIVE RECOMBINATION OF FREE-EXCITONS IN GAAS QUANTUM-WELLS SO PHYSICAL REVIEW LETTERS LA English DT Article ID SUPERLATTICE; RELAXATION; DYNAMICS; ENERGY AB Radiative properties of free excitons in a single GaAs quantum well are studied under resonant excitation. Enhanced radiative recombination of the excitons, caused by the breakdown of the translational symmetry of the system, is evidenced by the very short lifetime as well as by the strong intensity of the signal. Dephasing mechanisms, by transferring the excitons to nonradiative states, increase the observed lifetime. We deduce a radiative lifetime of 10 +/- 4 ps in the absence of dephasing mechanisms. C1 CTR NATL ETUD TELECOMMUN,F-92120 BAGNEUX,FRANCE. USN,RES LAB,WASHINGTON,DC 20375. RP DEVEAUD, B (reprint author), CTR NATL ETUD TELECOMMUN,F-22300 LANNION,FRANCE. RI Deveaud, Benoit/A-4782-2013; Katzer, D. Scott/N-7841-2013; Deveaud, Benoit/N-1947-2014 OI Deveaud, Benoit/0000-0002-9776-6314; Deveaud, Benoit/0000-0002-9776-6314 NR 32 TC 250 Z9 251 U1 5 U2 21 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0031-9007 J9 PHYS REV LETT JI Phys. Rev. Lett. PD OCT 21 PY 1991 VL 67 IS 17 BP 2355 EP 2358 DI 10.1103/PhysRevLett.67.2355 PG 4 WC Physics, Multidisciplinary SC Physics GA GK725 UT WOS:A1991GK72500030 ER PT J AU DAVIS, JP SMITH, AL GIRANDA, C SQUICCIARINI, M AF DAVIS, JP SMITH, AL GIRANDA, C SQUICCIARINI, M TI LASER-INDUCED PLASMA FORMATION IN XE, AR, N2, AND O2 AT THE 1ST 4 ND-YAG HARMONICS SO APPLIED OPTICS LA English DT Article ID INDUCED AIR BREAKDOWN; 0.35 MU-M; GASES; RADIATION; DEPENDENCE; THRESHOLDS; NITROGEN; ARGON AB Irradiance values have been measured for the onset of laser-induced plasma formation in Xe, Ar, N2 and O2 at pressures from 760 to 25 Torr at wavelengths of 1.064, 0.532, 0.355, and 0.266-mu-m. These values have been compared with the results of other workers who used similar experimental setups. There is agreement within a factor of 4 when irradiance values are compared and within a factor of 2 when ratios of irradiance values for different gasses are compared. Comparisons among workers who used widely different pulse lengths indicate that the onset of plasma formation is measured better by energy fluence than by irradiance. C1 DREXEL UNIV,DEPT CHEM,PHILADELPHIA,PA 19104. RP DAVIS, JP (reprint author), USN,CTR AIR DEV,CODE 5012,WARMINSTER,PA 18974, USA. NR 20 TC 25 Z9 25 U1 0 U2 6 PU OPTICAL SOC AMER PI WASHINGTON PA 2010 MASSACHUSETTS AVE NW, WASHINGTON, DC 20036 SN 0003-6935 J9 APPL OPTICS JI Appl. Optics PD OCT 20 PY 1991 VL 30 IS 30 BP 4358 EP 4364 PG 7 WC Optics SC Optics GA GQ421 UT WOS:A1991GQ42100015 PM 20717208 ER PT J AU ZHU, X SUMMERS, ME STROBEL, DF AF ZHU, X SUMMERS, ME STROBEL, DF TI ANALYTIC MODELS FOR THE OZONE RADIATIVE ABSORPTION RATE AT 9.6-MU-M IN THE MESOSPHERE SO JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES LA English DT Article ID VOIGT; BAND; APPROXIMATION; EQUILIBRIUM AB Analytic models of the ozone radiative absorption rate in the 9.6-mu-m band were developed on the basis of negligible line overlap in the mesosphere and low thermosphere. In the first model the line intensity distribution was represented by an S-1-beta tailed exponential distribution. The band escape function was calculated by an integration over a single line profile with the diffusivity effect included exactly. Because ozone absorption is weak in the mesosphere, the major contribution to the absorption rate comes mainly from the strongest lines and the distribution function reduces to exponential form. In our second model, approximations for the diffusivity effect (diffusivity factor), line profile (Voigt), and line intensity distribution (Malkmus) were introduced to obtain an analytic expression for the band escape function. Both models yield accurate results for three examples that span the range of temperatures and ozone profiles encountered in the mesosphere and lower thermosphere with the maximum fractional errors never exceeding 4%. These two models are particularly suited for non-LTE calculations and analysis of remote sensing data of the ozone 9.6-mu-m band in the mesosphere and lower thermosphere. C1 USN, RES LAB, EO HULBURT CTR SPACE RES, WASHINGTON, DC 20375 USA. RP ZHU, X (reprint author), JOHNS HOPKINS UNIV, DEPT EARTH & PLANETARY SCI, BALTIMORE, MD 21218 USA. RI Zhu, Xun/C-2097-2016 OI Zhu, Xun/0000-0001-7860-6430 NR 22 TC 8 Z9 8 U1 0 U2 0 PU AMER GEOPHYSICAL UNION PI WASHINGTON PA 2000 FLORIDA AVE NW, WASHINGTON, DC 20009 USA SN 2169-897X J9 J GEOPHYS RES-ATMOS JI J. Geophys. Res.-Atmos. PD OCT 20 PY 1991 VL 96 IS D10 BP 18551 EP 18559 DI 10.1029/91JD01969 PG 9 WC Meteorology & Atmospheric Sciences SC Meteorology & Atmospheric Sciences GA GM167 UT WOS:A1991GM16700002 ER PT J AU BEECHAM, HJ LO, SC LEWIS, DE COMER, SW RILEY, KJ OLDFIELD, EC AF BEECHAM, HJ LO, SC LEWIS, DE COMER, SW RILEY, KJ OLDFIELD, EC TI RECOVERY FROM FULMINANT INFECTION WITH MYCOPLASMA-FERMENTANS (INCOGNITUS STRAIN) IN NONIMMUNOCOMPROMISED HOST SO LANCET LA English DT Letter ID AIDS C1 USN HOSP,DEPT LAB,DIV PATHOL,SAN DIEGO,CA 92134. USN HOSP,DEPT CLIN INVEST,SAN DIEGO,CA 92134. ARMED FORCES INST PATHOL,DEPT INFECT & PARASIT DIS PATHOL,WASHINGTON,DC 20306. RP BEECHAM, HJ (reprint author), USN HOSP,DEPT INTERNAL MED,DIV INFECT DIS,SAN DIEGO,CA 92134, USA. NR 7 TC 18 Z9 18 U1 0 U2 0 PU LANCET LTD PI LONDON PA 42 BEDFORD SQUARE, LONDON, ENGLAND WC1B 3SL SN 0140-6736 J9 LANCET JI Lancet PD OCT 19 PY 1991 VL 338 IS 8773 BP 1014 EP 1015 DI 10.1016/0140-6736(91)91874-T PG 2 WC Medicine, General & Internal SC General & Internal Medicine GA GK974 UT WOS:A1991GK97400033 PM 1681317 ER PT J AU ROBERTS, N AF ROBERTS, N TI THE ORGANIZATIONAL HOLOGRAM - THE EFFECTIVE MANAGEMENT OF ORGANIZATIONAL-CHANGE - MACKENZIE,KD SO EUROPEAN JOURNAL OF OPERATIONAL RESEARCH LA English DT Book Review RP ROBERTS, N (reprint author), USN,POST GRAD SCH,MONTEREY,CA 93943, USA. NR 7 TC 0 Z9 0 U1 0 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0377-2217 J9 EUR J OPER RES JI Eur. J. Oper. Res. PD OCT 16 PY 1991 VL 54 IS 3 BP 376 EP 378 DI 10.1016/0377-2217(91)90124-E PG 3 WC Management; Operations Research & Management Science SC Business & Economics; Operations Research & Management Science GA GT287 UT WOS:A1991GT28700017 ER PT J AU MESZAROS, K AF MESZAROS, K TI MAGNETIC-FIELD ELICITS HYPOTENSION MEDIATED BY PLATELET-ACTIVATING-FACTOR IN RATS INJECTED WITH IRON BEADS SO BIOCHEMICAL AND BIOPHYSICAL RESEARCH COMMUNICATIONS LA English DT Article ID MACROPHAGES; RELEASE; CELLS C1 USN,MED RES INST,SEPT SHOCK RES PROGRAM,BETHESDA,MD 20889. NR 18 TC 3 Z9 3 U1 0 U2 0 PU ACADEMIC PRESS INC JNL-COMP SUBSCRIPTIONS PI SAN DIEGO PA 525 B ST, STE 1900, SAN DIEGO, CA 92101-4495 SN 0006-291X J9 BIOCHEM BIOPH RES CO JI Biochem. Biophys. Res. Commun. PD OCT 15 PY 1991 VL 180 IS 1 BP 315 EP 322 DI 10.1016/S0006-291X(05)81294-X PG 8 WC Biochemistry & Molecular Biology; Biophysics SC Biochemistry & Molecular Biology; Biophysics GA GL312 UT WOS:A1991GL31200049 PM 1930228 ER PT J AU ENGHARDT, MH JORDAN, SE AF ENGHARDT, MH JORDAN, SE TI GRANULAR-CELL TUMOR OF A DIGITAL NERVE SO CANCER LA English DT Article ID NEURON SPECIFIC ENOLASE; S-100 PROTEIN; CARCINOEMBRYONIC ANTIGEN; MYOBLASTOMA; IMMUNOPEROXIDASE; LOCALIZATION; ORIGIN; LIGHT AB Granular cell tumor is an infrequently encountered albeit not rare neoplasm considered to be of neuroectodermal origin. An example of a benign granular cell tumor originating within a digital nerve is presented. The authors employed routine light microscopic techniques and immunostaining which demonstrate features of the granular cells reflecting structural and functional characteristics of Schwann's cells and support neuroectodermal derivation. Granular cell tumor is ubiquitous in location but occurs more frequently in tongue, skin, and subcutaneous tissue. Clinical features are not specific, and a histologic evaluation is required for diagnosis. Circumscription and lack of cellular pleomorphism define a benign process. However, irrespective of its histologic appearance, the biologic potential is uncertain. Complete excision suffices as treatment for benign tumors. C1 USN HOSP,DEPT ORTHOPAED,NEWPORT,RI. USN HOSP,DEPT PATHOL,NEWPORT,RI. KERLAN JOBE ORTHOPAED CLIN,INGLEWOOD,CA. RP ENGHARDT, MH (reprint author), BROOKE ARMY MED CTR,DEPT PATHOL,FT SAM HOUSTON,TX 78234, USA. NR 46 TC 15 Z9 15 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 OCT 15 PY 1991 VL 68 IS 8 BP 1764 EP 1769 DI 10.1002/1097-0142(19911015)68:8<1764::AID-CNCR2820680820>3.0.CO;2-# PG 6 WC Oncology SC Oncology GA GH289 UT WOS:A1991GH28900019 PM 1913521 ER PT J AU BECKER, CAL BISWAS, MAS COOPER, JC AF BECKER, CAL BISWAS, MAS COOPER, JC TI SYNTHESIS OF TETRAKIS(CYCLOHEXYLISOCYANIDE)BIS(TRI-NORMAL-HEXYLPHOSPHINE)-COBALT(III) PERCHLORATE AND TRIS(CYCLOHEXYLISOCYANIDE)BIS(TRI-NORMAL-HEXYLPHOSPHINE)COBALT(I) PERCHLORATE - AN EXAMPLE OF COBALT(II) DISPROPORTIONATION WITH ALKYLISOCYANIDE AND TRIALKYLPHOSPHINE LIGANDS SO INORGANICA CHIMICA ACTA LA English DT Article AB Isolation of [Co(CNC6H11)3{P(C6H13-n)3}2]ClO4 and [Co(CNC6H11)4{P(C6H13-n)3}2](ClO4)3 in the reaction of [Co(CNC6H11)5](ClO4)2 with excess P(C6H13-n)3 in ethanol solution establishes the disproportionation nature of this reaction: 2[Co(CNR)5]2+ + 4PR3 --> [Co(CNR)3(PR3)2]+ + [Co(CNR)4(PR3)2]3+ + 3CNR. The complexes are characterized by nu(- N = C), electronic spectra, magnetic susceptibility and molar conductivity. White, diamagnetic [Co(CNC6H11)4{P(C6H13-n)3}2](ClO4)3 is probably a regular tetragonal structure (D4h) in solution but distorted in the solid state, i.e. trans-[Co(CNC6H11)4{P(C6H13-n)3}2](ClO4)3. Yellow, diamagnetic [Co(CNC6H11)3{P(C6H13-n)3}2]ClO4 is probably distorted axially disubstituted trigonal bipyramidal (C2-nu) in both solution and the solid state. Molar conductivities for [Co(CNC6H11)3-P(C6H13-n)3}2]ClO4 indicate fully-ionized 1:1 electrolyte behavior in all solvents, but LAMBDA-M values for [Co(CNC6H11)4{P(C6H13-n)3}2](ClO4)3 suggest 3:1 electrolyte behavior in CH3CN and CH3NO2, with increasing ion-pairing in Me2NCHO, CF3CH2OH, acetone and CH2Cl2. C1 USN,RES LAB,DIV CHEM,WASHINGTON,DC 20375. RP BECKER, CAL (reprint author), UNIV BAHRAIN,DEPT CHEM,POB 32038,MANAMA,BAHRAIN. NR 11 TC 12 Z9 12 U1 0 U2 0 PU ELSEVIER SCIENCE SA LAUSANNE PI LAUSANNE 1 PA PO BOX 564, 1001 LAUSANNE 1, SWITZERLAND SN 0020-1693 J9 INORG CHIM ACTA JI Inorg. Chim. Acta PD OCT 15 PY 1991 VL 188 IS 2 BP 191 EP 194 DI 10.1016/S0020-1693(00)80371-0 PG 4 WC Chemistry, Inorganic & Nuclear SC Chemistry GA GW334 UT WOS:A1991GW33400013 ER PT J AU ASHRAFI, S SAENZ, AW UBERALL, H AF ASHRAFI, S SAENZ, AW UBERALL, H TI SPLITTING AND CONTRARY MOTION OF COHERENT BREMSSTRAHLUNG PEAKS IN STRAINED-LAYER SUPERLATTICES SO JOURNAL OF APPLIED PHYSICS LA English DT Article ID CHANNELING ANALYSIS; EPITAXY AB The peaks in the spectrum of coherent bremsstrahlung from MeV-GeV electrons in crystalline targets are split into components if the target is a strained-layer superlattice (SLS). We have studied this effect theoretically for an illustrative example; it also entails that when the crystal is rocked, a contrary motion of the split components takes place. Due to their strong dependence on beam orientation relative to a channel axis, these new predicted phenomena should provide a sensitive measure of the strains in SLS layers; but because of the broadening of the photon peaks in thin layers, good observability will be restricted to superlattice layers with a thickness of several hundred angstrom or more. C1 USN,RES LAB,COMPLEX SYST THEORY BRANCH,WASHINGTON,DC 20375. RP ASHRAFI, S (reprint author), CATHOLIC UNIV AMER,DEPT PHYS,WASHINGTON,DC 20064, USA. NR 23 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 OCT 15 PY 1991 VL 70 IS 8 BP 4190 EP 4193 DI 10.1063/1.349143 PG 4 WC Physics, Applied SC Physics GA GL023 UT WOS:A1991GL02300025 ER PT J AU COFFEY, CS AF COFFEY, CS TI THE LOCALIZATION OF ENERGY AND PLASTIC-DEFORMATION IN CRYSTALLINE SOLIDS DURING SHOCK OR IMPACT SO JOURNAL OF APPLIED PHYSICS LA English DT Article ID INDUCED LUMINESCENCE AB When crystalline solids are subjected to shock or impact the resulting plastic shear deformation is often concentrated in narrow-band-like regions. These regions are the sites of considerable energy localization and often determine the response of the crystal to the rapid deformation. Here, a theoretical account is given of this energy-localization plastic-deformation process. It is shown that the process is distinctly quantum mechanical. For mild shocks or impacts the energy dissipated within the bands can cause heating, material failure, and, where appropriate, chemical reactions. For high-amplitude shocks rapid multiphonon-stimulated internal molecular excitation can occur. This energy localization is responsible for both the initiation of chemical reaction in explosive crystals subjected to mild impact and the transition to detonation in these same crystals during high-amplitude shock loading. RP COFFEY, CS (reprint author), USN,CTR SURFACE WARFARE,10901 NEW HAMPSHIRE AVE,SILVER SPRING,MD 20903, USA. NR 24 TC 15 Z9 15 U1 0 U2 3 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0021-8979 J9 J APPL PHYS JI J. Appl. Phys. PD OCT 15 PY 1991 VL 70 IS 8 BP 4248 EP 4254 DI 10.1063/1.349151 PG 7 WC Physics, Applied SC Physics GA GL023 UT WOS:A1991GL02300033 ER PT J AU MEYER, JR BARTOLI, FJ YOUNGDALE, ER HOFFMAN, CA AF MEYER, JR BARTOLI, FJ YOUNGDALE, ER HOFFMAN, CA TI EFFECTS OF ENERGY-GAP AND BAND-STRUCTURE ON FREE-CARRIER NONLINEAR SUSCEPTIBILITIES IN SEMICONDUCTORS SO JOURNAL OF APPLIED PHYSICS LA English DT Article ID OPTICAL-PHASE CONJUGATION; NON-LINEAR REFRACTION; MU-M; SUPERLATTICES; COEFFICIENTS; HG1-XCDXTE; HGCDTE AB Using dispersion relations from the Kane band model, we obtain limiting forms for the third-order nonlinear susceptibilities due to nonparabolicity, thermal-carrier generation, and nonequilibrium optical-carrier generation. We show that whereas chi(3)'s for all three processes increase with decreasing energy gap, there is no further benefit once E(g) becomes smaller than either the Fermi or thermal energies. In fact, simultaneous optimization of both the magnitude of chi(3) and the saturation properties favors materials with a large direct gap and large effective mass, coupled with a smaller gap which may be indirect in either real or momentum space. RP MEYER, JR (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 26 TC 15 Z9 15 U1 0 U2 0 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0021-8979 J9 J APPL PHYS JI J. Appl. Phys. PD OCT 15 PY 1991 VL 70 IS 8 BP 4317 EP 4321 DI 10.1063/1.349110 PG 5 WC Physics, Applied SC Physics GA GL023 UT WOS:A1991GL02300042 ER PT J AU BUSSMANN, U ROBINSON, AK HEMMENT, PLF CAMPISI, GJ AF BUSSMANN, U ROBINSON, AK HEMMENT, PLF CAMPISI, GJ TI SILICON-ON-INSULATOR DEVICE ISLANDS FORMED BY OXYGEN IMPLANTATION THROUGH PATTERNED MASKING LAYERS SO JOURNAL OF APPLIED PHYSICS LA English DT Article AB Separation by implanted oxygen is recognized as a versatile technology to produce silicon-on-insulator substrates. The lateral isolation of device islands is achieved by subsequent local oxidation or mesa etching of the silicon top layer. In an alternative approach, implantation is performed through patterned masking layers leading to a continuous but nonplanar buried oxide. Thereby, total dielectric isolation (vertical and lateral) of the device island is achieved in a single implantation stage. The masking structures used in this investigation are thermal oxides and polycrystalline silicon layers with window openings as well as patterned wafers formed by local oxidation of the bulk silicon wafers. Oxygen was implanted with energies of 100 and 200 keV to doses up to 2.2 x 10(18) O+ cm-2. The resulting structures are studied by cross-sectional scanning electron microscopy and transmission electron microscopy and the effects of mask material and implantation energy are discussed. C1 USN,RES LAB,WASHINGTON,DC 20375. RP BUSSMANN, U (reprint author), UNIV SURREY,DEPT ELECTR & ELECT ENGN,GUILDFORD GU2 5XH,SURREY,ENGLAND. NR 16 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 0021-8979 J9 J APPL PHYS JI J. Appl. Phys. PD OCT 15 PY 1991 VL 70 IS 8 BP 4584 EP 4592 DI 10.1063/1.349095 PG 9 WC Physics, Applied SC Physics GA GL023 UT WOS:A1991GL02300084 ER PT J AU MORISON, J AF MORISON, J TI SEASONAL-VARIATIONS IN THE WEST SPITSBERGEN CURRENT ESTIMATED FROM BOTTOM PRESSURE MEASUREMENTS SO JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS LA English DT Article ID SHOALS FLUX EXPERIMENT; OCEAN; ICE; MODEL; MASS; HEAT AB From 1982 to 1985 two pressure gauges were deployed across the continental shelf northwest of Spitsbergen to determine the seasonal variations in the barotropic component of the West Spitsbergen Current. The variation in current velocity was calculated after analysis and removal of the tidal signals and correction of the pressure difference across the 47-km section for bottom buoyancy effects. The pressure-derived velocity fluctuates about 10 cm s-1 peak to peak with the maximum northward flow occurring in the winter. The maximum appears to the correlated with the seasonal cycle of wind stress curl in the northern Greenland Sea. In fact, the magnitude of the velocity variation corresponds to the Sverdrup transport due to the fluctuation in wind stress curl at 79-degrees-N, 7.5-degrees-E. The idea that the observed variation might also be due to the spin-up of the basin by wind stress curl is explored with two simple analytical models. Basin spin-up does appear to be a possible cause. However, East Greenland Current velocity data from Muench et al. (1986) indicate that the fluctuation about the mean in the deep currents on the western side of the basin is northward in winter, while basin spin-up would produce a southward fluctuation. This supports the idea that Sverdrup transport dominates basin spin-up, at least at the margins of the basin. The fluctuations in transport and heat flux though the pressure gauge section are estimated to be 2 Sv and 30 to 60 TW peak to peak. These values are major fractions of historical estimates of the mean transport and heat flux values in the West Spitsbergen Current, and they are significant fractions of the total oceanic fluxes into the Arctic Ocean. This suggests that long time series are required to make meaningful estimates of the heat budget of the Arctic C1 USN,POSTGRAD SCH,DEPT OCEANOG,MONTEREY,CA 93940. NR 33 TC 28 Z9 28 U1 0 U2 4 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 OCT 15 PY 1991 VL 96 IS C10 BP 18381 EP 18395 DI 10.1029/91JC01916 PG 15 WC Oceanography SC Oceanography GA GL027 UT WOS:A1991GL02700003 ER PT J AU FENG, CR MICHEL, DJ CROWE, CR AF FENG, CR MICHEL, DJ CROWE, CR TI MICROSTRUCTURAL CHARACTERISTICS OF 2-PHASE TITANIUM ALUMINIDES SO MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING LA English DT Article ID ELEVATED-TEMPERATURES; DEFORMATION; ALLOYS; FRACTURE; TI3AL AB The microstructural characteristics of two-phase alpha-2 + gamma, conventional and XD-processed, titanium aluminides were investigated by transmission electron microscopy. The observed microstructures show that the two-phase material composition promotes the formation of alternating lamellae of alpha-2 and gamma corresponding to twin-related gamma-laths. The microstructures of XD materials suggest that the influence of excess boron dissolved from TiB2 particles was to reduce the alpha-2-gamma interfacial mismatch. The microstructural results demonstrate that deformation which occurs via the formation of alpha-2 layers and twin-realted gamma-laths, rather than via large populations of mobile dislocations, plays the primary role in the deformation behavior of the two-phase titanium aluminides and show that twin-related gamma-lath formation was very important to the capability of two-phase materials for continuous deformation. RP FENG, CR (reprint author), USN,RES LAB,DIV MAT SCI & TECHNOL,WASHINGTON,DC 20375, USA. NR 20 TC 27 Z9 29 U1 0 U2 0 PU ELSEVIER SCIENCE SA LAUSANNE PI LAUSANNE 1 PA PO BOX 564, 1001 LAUSANNE 1, SWITZERLAND SN 0921-5093 J9 MAT SCI ENG A-STRUCT JI Mater. Sci. Eng. A-Struct. Mater. Prop. Microstruct. Process. PD OCT 15 PY 1991 VL 145 IS 2 BP 257 EP 264 DI 10.1016/0921-5093(91)90255-L PG 8 WC Nanoscience & Nanotechnology; Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Science & Technology - Other Topics; Materials Science; Metallurgy & Metallurgical Engineering GA GP102 UT WOS:A1991GP10200014 ER PT J AU JEWELL, JM AGGARWAL, ID AF JEWELL, JM AGGARWAL, ID TI DETERMINATION OF INTRINSIC MIDINFRARED ABSORPTION OF A FLUORIDE GLASS SO OPTICS LETTERS LA English DT Article ID LASER CALORIMETRY AB The intrinsic mid-infrared optical absorption of a ZrF4-BaF2-LaF3-AlF3-NaF (ZBLAN) glass has been determined by combining laser calorimetry and spark-source mass spectrographic analysis. The total optical absorption of four samples of varying purity was measured at 3.9-mu-m with laser calorimetry. The extrinsic contribution to the total absorption for each glass was calculated from the measured concentration of rare-earth impurity ions and known extinction coefficients. The intrinsic absorption of this glass at 3.9-mu-m determined from the difference between the total measured absorption and the calculated extrinsic absorption is 6.11 (+/- 0.61) X 10(-4) cm-1. RP JEWELL, JM (reprint author), USN,RES LAB,OPT MAT RES GRP,WASHINGTON,DC 20375, USA. NR 13 TC 2 Z9 2 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 OCT 15 PY 1991 VL 16 IS 20 BP 1554 EP 1556 DI 10.1364/OL.16.001554 PG 3 WC Optics SC Optics GA GK876 UT WOS:A1991GK87600002 PM 19777029 ER PT J AU HABER, I KEHNE, D REISER, M RUDD, H AF HABER, I KEHNE, D REISER, M RUDD, H TI EXPERIMENTAL, THEORETICAL, AND NUMERICAL INVESTIGATION OF THE HOMOGENIZATION OF DENSITY NONUNIFORMITIES IN THE PERIODIC TRANSPORT OF A SPACE-CHARGE DOMINATED BEAM SO PHYSICAL REVIEW A LA English DT Article ID ELECTRON-BEAM; EMITTANCE GROWTH; SOLENOID CHANNEL AB The homogenization of a beam with a transversely nonuniform initial density distribution is examined by masking the output from a Pierce electron gun into five parallel beamlets, which are then propagated down a channel of periodically spaced solenoid focusing magnets. Experimental measurements, theoretical predictions, and PIC simulations are in excellent agreement for averaged beam quantities such as rms emittance and envelope radius. In addition, the fine-structure characteristic of the nonlinear evolution of the beam, including the formation of downstream images, is reproduced in detail by the simulations. C1 UNIV MARYLAND,DEPT ELECT ENGN,COLLEGE PK,MD 20742. UNIV MARYLAND,PLASMA PHYS LAB,COLLEGE PK,MD 20742. BERKELEY RES ASSOCIATES INC,SPRINGFIELD,VA 22150. RP HABER, I (reprint author), USN,RES LAB,DIV PLASMA PHYS,WASHINGTON,DC 20375, USA. NR 23 TC 27 Z9 27 U1 0 U2 2 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1050-2947 J9 PHYS REV A JI Phys. Rev. A PD OCT 15 PY 1991 VL 44 IS 8 BP 5194 EP 5205 DI 10.1103/PhysRevA.44.5194 PG 12 WC Optics; Physics, Atomic, Molecular & Chemical SC Optics; Physics GA GM060 UT WOS:A1991GM06000049 ER PT J AU FELDMAN, JL KAXIRAS, E LI, XP AF FELDMAN, JL KAXIRAS, E LI, XP TI LOCALIZED ADATOM VIBRATIONS IN SI CLUSTERS SO PHYSICAL REVIEW B LA English DT Note ID SI(111) RECONSTRUCTED SURFACES; SEMICONDUCTOR CLUSTERS; CHEMISTRY; SILICON AB We present results for the vibrational spectra of models for Si clusters. Our calculations are based on the Stillinger-Weber phenomenological potential. We find that in a 33-atom model cluster there exist localized "adatom" vibrations that are similar in character to modes of the 7 X 7 reconstructed Si(111) crystalline surface. The unique character of the localized adatom modes would serve as a stringent test of the cluster geometry through Raman experiments. C1 SACHS FREEMAN ASSOCIATES INC,LANDOVER,MD 20785. UNIV ILLINOIS,DEPT PHYS,URBANA,IL 61801. RP FELDMAN, JL (reprint author), USN,RES LAB,COMPLEX SYST THEORY BRANCH,WASHINGTON,DC 20375, USA. NR 13 TC 13 Z9 13 U1 1 U2 3 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD OCT 15 PY 1991 VL 44 IS 15 BP 8334 EP 8337 DI 10.1103/PhysRevB.44.8334 PG 4 WC Physics, Condensed Matter SC Physics GA GK728 UT WOS:A1991GK72800068 ER PT J AU HOFFMAN, CA MEYER, JR BARTOLI, FJ LANSARI, Y COOK, JW SCHETZINA, JF AF HOFFMAN, CA MEYER, JR BARTOLI, FJ LANSARI, Y COOK, JW SCHETZINA, JF TI ELECTRON MOBILITIES AND QUANTUM HALL-EFFECT IN MODULATION-DOPED HGTE-CDTE SUPERLATTICES SO PHYSICAL REVIEW B LA English DT Note ID MOLECULAR-BEAM EPITAXY; TRANSPORT; GAP AB Photoassisted molecular-beam epitaxy and controlled modulation doping have been used to grow HgTe-CdTe superlattices with n-type carrier concentrations of up to 3 x 10(17) cm-3. It is found that in contrast to Hg1-xCdxTe alloys where the electron mobility decreases strongly with donor concentration, mu-n in the modulation-doped superlattices is nearly independent of N(D) at large N(D). We also discuss an observation of the quantum Hall effect associated with carriers distributed throughout the interior of a HgTe-CdTe superlattice. Whereas previous reports of quantized steps in the Hall conductivity have involved a small number of conduction channels (hence a small fraction of the superlattice periods), we observe plateaus at multiples of almost-equal-to 200e2/h in a number of 200-period superlattices with high doping levels. This indicates participation by nearly all wells in the superlattice, and implies that the controlled doping is extremely uniform. C1 N CAROLINA STATE UNIV,RALEIGH,NC 27695. RP HOFFMAN, CA (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 13 TC 15 Z9 15 U1 0 U2 1 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD OCT 15 PY 1991 VL 44 IS 15 BP 8376 EP 8379 DI 10.1103/PhysRevB.44.8376 PG 4 WC Physics, Condensed Matter SC Physics GA GK728 UT WOS:A1991GK72800079 ER PT J AU GILMORE, CM SPRAGUE, JA AF GILMORE, CM SPRAGUE, JA TI MOLECULAR-DYNAMICS SIMULATION OF THE ENERGETIC DEPOSITION OF AG THIN-FILMS SO PHYSICAL REVIEW B LA English DT Article ID IONIZED-CLUSTER BEAM; EMBEDDED-ATOM-METHOD; EPITAXIAL-GROWTH; ION-BOMBARDMENT; SILICON; CU; SURFACE; SI(111); METAL; NI AB A three-dimensional molecular-dynamics simulation of the growth of 500 energetic Ag atoms incident on a substrate with 1008 Ag atoms was conducted with the atomic interactions modeled by the embedded-atom method. The substrate temperature was 300 K and incident-Ag-atom energies ranged from 0.1 to 10 eV. For all incident-atom energies the growth was epitaxial. For low incident-atom energies the surface topography was three-dimensional islands, but the growth changed progressively towards layer-by-layer (Frank-van der Merwe) growth as the incident-atom energy increased to 10 eV. At low incident-atom energy (0.1 eV) the primary mechanism for redistribution of atoms between layers of the film was the collapse of unstable configurations of atoms. For higher incident-atom energies (1.0 and 10.0 eV) the primary redistribution mechanism was ballistic displacement. At low fractional layer coverage, both perfect-crystal and stacking-fault sites were occupied; for larger layer coverage, however, all of the atoms in a single layer tended to occupy one type of site, although both perfect and stacking-fault layers were observed. C1 GEORGE WASHINGTON UNIV,SCH ENGN & APPL SCI,WASHINGTON,DC 20052. RP GILMORE, CM (reprint author), USN,RES LAB,SURFACE MODIFICAT BRANCH,WASHINGTON,DC 20375, USA. NR 26 TC 104 Z9 104 U1 3 U2 15 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1098-0121 J9 PHYS REV B JI Phys. Rev. B PD OCT 15 PY 1991 VL 44 IS 16 BP 8950 EP 8957 DI 10.1103/PhysRevB.44.8950 PG 8 WC Physics, Condensed Matter SC Physics GA GN304 UT WOS:A1991GN30400060 ER PT J AU GROSSMAN, Y COLTON, JS GILMAN, SC AF GROSSMAN, Y COLTON, JS GILMAN, SC TI REDUCED CA CURRENTS IN FROG NERVE-TERMINALS AT HIGH-PRESSURE SO ANNALS OF THE NEW YORK ACADEMY OF SCIENCES LA English DT Article ID NEUROMUSCULAR-JUNCTION C1 USN,RES INST,BETHESDA,MD 20889. RP GROSSMAN, Y (reprint author), BEN GURION UNIV NEGEV,FAC HLTH SCI,DEPT PHYSIOL,IL-84105 BEER SHEVA,ISRAEL. NR 5 TC 12 Z9 13 U1 0 U2 0 PU NEW YORK ACAD SCIENCES PI NEW YORK PA 2 E 63RD ST, NEW YORK, NY 10021 SN 0077-8923 J9 ANN NY ACAD SCI JI Ann. N.Y. Acad. Sci. PD OCT 14 PY 1991 VL 635 BP 411 EP 412 DI 10.1111/j.1749-6632.1991.tb36512.x PG 2 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA JM206 UT WOS:A1991JM20600038 PM 1660243 ER PT J AU WEILER, KW VANDYK, SD PANAGIA, N SRAMEK, RA DISCENNA, JL AF WEILER, KW VANDYK, SD PANAGIA, N SRAMEK, RA DISCENNA, JL TI THE 10 YEAR RADIO LIGHT CURVES FOR SN-1979C SO ASTROPHYSICAL JOURNAL LA English DT Article DE NEBULAE, SUPERNOVAE REMNANTS; STARS, INDIVIDUAL (SN-1979C); STARS, RADIO RADIATION; STARS, SUPERNOVAE ID SUPERNOVA-REMNANTS; LARGE ARRAY; EMISSION; EVOLUTION AB We present new observations of the radio supernova SN 1979C made with the VLA at lambda-lambda-20, 6, and 2 cm from 1985 March through 1990 December, augmenting our previous observations which began only 8 days after optical maximum in 1979 April and extended through 1984 November. We find that the "mini-shell" model of Chevalier still provides the best representation of these more complete light curves at all three wavelengths. Shorter period fluctuations in the observations are real and are probably due to emission efficiency variations caused by structure in the presupernova stellar wind density. We also find evidence for more than 1 M. lost from the progenitor star in the presupernova stellar wind. This suggests that the star's mass was originally M(ZAMS) greater-than-or-similar-to 13 M.. These observations represent the longest and most complete data set available for the emission from any supernova in any wavelength band. C1 SPACE TELESCOPE SCI INST,BALTIMORE,MD 21218. NATL RADIO ASTRON OBSERV,SOCORRO,NM 87801. UNIV CATANIA,I-95124 CATANIA,ITALY. RP WEILER, KW (reprint author), USN,RES LAB,CTR ADV SPACE SENSING,CODE 4215,WASHINGTON,DC 20375, USA. NR 22 TC 87 Z9 87 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 OCT 10 PY 1991 VL 380 IS 1 BP 161 EP 166 DI 10.1086/170571 PN 1 PG 6 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA GH912 UT WOS:A1991GH91200017 ER PT J AU BOOS, JB KRUPPA, W AF BOOS, JB KRUPPA, W TI INALAS/INGAAS/INP HEMTS WITH HIGH BREAKDOWN VOLTAGES USING DOUBLE-RECESS GATE PROCESS SO ELECTRONICS LETTERS LA English DT Article DE TRANSISTORS; SEMICONDUCTOR DEVICES AND MATERIALS AB The DC and RF performance of InAlAs/InGaAs/InP HEMTs fabricated using a double-recess gate process are reported. A gate-drain breakdown voltage as high as 16 V was observed. The HEMTs also exhibited a high source-drain breakdown voltage near pinchoff of 16 V and a low RF output conductance of 6 mS/mm. For a 1.4-mu-m gate length, an intrinsic transconductance or 560 mS/mm and f(T) and f(max) values of 16 and 40 GHz, respectively, were achieved. C1 SFA INC,LANDOVER,MD 20785. RP BOOS, JB (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 7 TC 25 Z9 25 U1 0 U2 1 PU IEE-INST ELEC ENG PI HERTFORD PA MICHAEL FARADAY HOUSE SIX HILLS WAY STEVENAGE, HERTFORD, ENGLAND SG1 2AY SN 0013-5194 J9 ELECTRON LETT JI Electron. Lett. PD OCT 10 PY 1991 VL 27 IS 21 BP 1909 EP 1910 DI 10.1049/el:19911185 PG 2 WC Engineering, Electrical & Electronic SC Engineering GA GL158 UT WOS:A1991GL15800014 ER PT J AU SPRANGLE, P ESAREY, E AF SPRANGLE, P ESAREY, E TI STIMULATED BACKSCATTERED HARMONIC-GENERATION FROM INTENSE LASER INTERACTIONS WITH BEAMS AND PLASMAS SO PHYSICAL REVIEW LETTERS LA English DT Article ID FREE-ELECTRON LASERS; CHIRPED-PULSE AMPLIFICATION; ELECTROMAGNETIC-WAVES; ACCELERATOR; INSTABILITIES; SCATTERING; IONIZATION; POWER AB Stimulated backscattered harmonic radiation generated by the interaction of an intense pump-laser field with an electron beam or plasma is analyzed using a fully nonlinear, relativistic, fluid theory valid to all orders in the pump-laser amplitude. The backscattered radiation occurs at odd harmonics of the Doppler-shifted incident laser frequency. The growth rates, saturation levels (efficiencies), and thermal limitations are calculated for the backscattered harmonic radiation. This mechanism may provide a practical method for producing coherent radiation in the XUV regime. RP SPRANGLE, P (reprint author), USN,RES LAB,DIV PLASMA PHYS,BEAM PHYS BRANCH,WASHINGTON,DC 20375, USA. NR 31 TC 81 Z9 82 U1 0 U2 4 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0031-9007 J9 PHYS REV LETT JI Phys. Rev. Lett. PD OCT 7 PY 1991 VL 67 IS 15 BP 2021 EP 2024 DI 10.1103/PhysRevLett.67.2021 PG 4 WC Physics, Multidisciplinary SC Physics GA GJ319 UT WOS:A1991GJ31900022 ER PT J AU SHLESINGER, MF WEST, BJ AF SHLESINGER, MF WEST, BJ TI COMPLEX FRACTAL DIMENSION OF THE BRONCHIAL TREE SO PHYSICAL REVIEW LETTERS LA English DT Article AB The architecture of the mammalian lung has been shown to be correctly described using a fractal model with a complex dimension, related to a Cantor set with random errors, for four different species. Here we provide an interpretation of that model that has implications for biological evolution. We argue that fractals are more error tolerant than other structures and therefore have an evolutionary advantage. C1 UNIV N TEXAS,DEPT PHYS,POB 5368,DENTON,TX 76203. OFF NAVAL RES,DIV PHYS,ARLINGTON,VA 22217. NR 12 TC 91 Z9 92 U1 1 U2 3 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0031-9007 J9 PHYS REV LETT JI Phys. Rev. Lett. PD OCT 7 PY 1991 VL 67 IS 15 BP 2106 EP 2108 DI 10.1103/PhysRevLett.67.2106 PG 3 WC Physics, Multidisciplinary SC Physics GA GJ319 UT WOS:A1991GJ31900044 ER PT J AU PIACQUADIO, K HOLLINGSWORTH, DR MURPHY, H AF PIACQUADIO, K HOLLINGSWORTH, DR MURPHY, H TI EFFECTS OF INUTERO EXPOSURE TO ORAL HYPOGLYCEMIC DRUGS SO LANCET LA English DT Article ID DIABETIC MOTHERS; MALFORMATIONS; INFANTS; PREGNANCY AB The observation that several Mexican-American women were taking oral hypoglycaemic agents while pregnant led to a study to confirm reports of associations between these agents and congenital abnormalities. 20 non-insulin-dependent (NIDDM) pregnant diabetic women with exposure to oral hypoglycaemic drugs during embryogenesis and 40 pregnant NIDDM women matched for age, race, parity, weight, and glycaemic control but not exposed to oral hypoglycaemic drugs were followed up. 10 infants (50%) in the exposed group had congenital malformations, compared with only 6 (15%) in the control group (p < 0.002). 5 (25%) infants in the exposed group had ear malformations, anomalies not commonly described in diabetic embryopathy. Hyperbilirubinemia (p < 0.04), polycythaemia, and hyperviscosity requiring partial exchange transfusions (p < 0.03) were commoner among babies in the exposed than in the control group. 3 babies in the exposed group but none in the comparison group had severe prolonged neonatal hypoglycaemia lasting 2, 4, and 7 days; 2 of the 3 had been exposed for 22 and 28 weeks during gestation, whereas the third had been exposed throughout the first trimester. Although exposure to oral hypoglycaemic drugs during fetal life seems to be associated with congenital malformations and neonatal hypoglycaemia, a large, prospective study is needed to exclude the confounding effect of maternal metabolic derangement secondary to diabetes. C1 UNIV CALIF SAN DIEGO,DEPT REPROD MED & MED 0802,LA JOLLA,CA 92093. USN HOSP,DEPT OBSTET & GYNECOL,SAN DIEGO,CA 92134. RI Brugnara, Carlo/A-8041-2010 OI Brugnara, Carlo/0000-0001-8192-8713 NR 29 TC 66 Z9 70 U1 0 U2 2 PU LANCET LTD PI LONDON PA 42 BEDFORD SQUARE, LONDON, ENGLAND WC1B 3SL SN 0140-6736 J9 LANCET JI Lancet PD OCT 5 PY 1991 VL 338 IS 8771 BP 866 EP 869 DI 10.1016/0140-6736(91)91512-S PG 4 WC Medicine, General & Internal SC General & Internal Medicine GA GH945 UT WOS:A1991GH94500014 PM 1681225 ER PT J AU WALDRON, A AF WALDRON, A TI THE WARLORD - 20TH-CENTURY CHINESE UNDERSTANDINGS OF VIOLENCE, MILITARISM, AND IMPERIALISM SO AMERICAN HISTORICAL REVIEW LA English DT Article; Proceedings Paper CT CONVENTION OF THE ORGANIZATION OF AMERICAN HISTORIANS CY APR 07, 1989 CL ST LOUIS, MO SP ORG AMER HISTORIANS RP WALDRON, A (reprint author), USN,COLL WAR,DEPT STRATEGY & POLICY,NEWPORT,RI 02840, USA. NR 99 TC 15 Z9 15 U1 0 U2 4 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 OCT PY 1991 VL 96 IS 4 BP 1073 EP 1100 DI 10.2307/2164996 PG 28 WC History SC History GA GN055 UT WOS:A1991GN05500004 ER PT J AU GIDDINGS, NA SHELTON, C OLEARY, MJ BRACKMANN, DE AF GIDDINGS, NA SHELTON, C OLEARY, MJ BRACKMANN, DE TI COCHLEOSACCULOTOMY REVISITED - LONG-TERM RESULTS POORER THAN EXPECTED SO ARCHIVES OF OTOLARYNGOLOGY-HEAD & NECK SURGERY LA English DT Article ID MENIERES-DISEASE AB Cochleosacculotomy has been described as a simple, efficacious treatment for relief of vertigo in patients with Meniere's disease in whom medical therapy has failed. We reviewed records of 11 elderly patients with good vestibular function who were thought to be ideal candidates for this procedure. Average follow-up was 17 months. Contrary to previous reports, long-term control of vertigo was poor, and more than 80% of the patients suffered a significant hearing loss from this procedure. Four of 11 patients required a second surgical procedure to control their vertigo. Audiometric measures revealed statistically significant postoperative increases in puretone thresholds at all frequencies and speech reception threshold, and a decrease in discrimination scores. Based on the results of this study, we no longer plan to use cochleosacculotomy for the treatment of elderly patients with Meniere's disease. C1 HOUSE EAR CLIN,2122 W 3RD ST,LOS ANGELES,CA 90057. GEISINGER MED CTR,DEPT OTOLARYNGOL HEAD & NECK SURG,DANVILLE,PA 17822. USN,REG MED CTR,SAN DIEGO,CA 92134. NR 7 TC 9 Z9 10 U1 0 U2 3 PU AMER MEDICAL ASSOC PI CHICAGO PA 515 N STATE ST, CHICAGO, IL 60610 SN 0886-4470 J9 ARCH OTOLARYNGOL JI Arch. Otolaryngol. Head Neck Surg. PD OCT PY 1991 VL 117 IS 10 BP 1150 EP 1152 PG 3 WC Otorhinolaryngology; Surgery SC Otorhinolaryngology; Surgery GA GJ143 UT WOS:A1991GJ14300016 PM 1910702 ER PT J AU MAZZARELLA, JM GAUME, RA SOIFER, BT GRAHAM, JR NEUGEBAUER, G MATTHEWS, K AF MAZZARELLA, JM GAUME, RA SOIFER, BT GRAHAM, JR NEUGEBAUER, G MATTHEWS, K TI THE DUST ENSHROUDED QUASAR IN THE ULTRALUMINOUS GALAXY MARKARIAN-463 - RADIO, NEAR-INFRARED, AND OPTICAL IMAGING SO ASTRONOMICAL JOURNAL LA English DT Article ID ACTIVE GALACTIC NUCLEI; SEYFERT-GALAXIES; SAMPLE; MORPHOLOGY; EVOLUTION; EMISSION; MKN-463 AB New radio continuum, near-infrared, and optical images are presented for the infrared ultraluminous galaxy Mrk 463, which prior optical work has shown to be an interacting/merging system containing two Seyfert 2 nuclei separated by 4" (4 kpc). The eastern nucleus, Mrk 463E, has a steep-spectrum (f-nu proportional nu-1) radio core with a luminosity density that is characteristic of a quasar or radio galaxy. Imaging at 20 cm reveals previously unknown components 4" north and 18" south of Mrk 463E, and a source 10" to the northwest which is apparently linked to the nuclear region. The western nucleus, Mrk 463W, has been detected at 6 and 20 cm (f-nu proportional nu-0.5); it has a radio luminosity comparable to that of a moderately luminous Seyfert galaxy or a highly luminous starburst galaxy. Near-infrared images at wavelengths less than 2.3-mu-m show the two nuclei; only Mrk 463E has been detected at 3.7-mu-m. Mrk 463E has an extremely red V - K color of 6.8 mag. Brightness profiles of Mrk 463E are unresolved at K and L' but extended at J; this is likely due to the effects of extinction and centrally concentrated hot dust emission. Radio continuum components 4-18 kpc from the nucleus are aligned with previously known 0.05-1.5 kpc radio structure and extended, conical [O III] emission. This suggests that Mrk 463E is powering weak radio lobes and may therefore exemplify a transition between the confined linear sources in Seyfert galaxies and the extended lobes in classical quasars and radio galaxies. Mrk 463E has a 3.7-mu-m luminosity and K - L' color comparable to PG quasars, suggesting that dust obscures an embedded quasar. These data are consistent with recent spectropolarimetry observations of Miller & Goodrich [ApJ, 355, 456 (1990)] that reveal a Seyfert 1 nucleus in Mrk 463E. We suggest that Mrk 463 represents the genesis of a classical quasar or radio galaxy. C1 USN, RES LAB, CTR ADV SPACE SENSING, WASHINGTON, DC 20375 USA. RP MAZZARELLA, JM (reprint author), CALTECH, PALOMAR OBSERV, PASADENA, CA 91125 USA. NR 52 TC 34 Z9 34 U1 0 U2 0 PU IOP PUBLISHING LTD PI BRISTOL PA DIRAC HOUSE, TEMPLE BACK, BRISTOL BS1 6BE, ENGLAND SN 0004-6256 J9 ASTRON J JI Astron. J. PD OCT PY 1991 VL 102 IS 4 BP 1241 EP 1252 DI 10.1086/115950 PG 12 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA GG675 UT WOS:A1991GG67500001 ER PT J AU LANGSTON, GI FISCHER, J ASPIN, C AF LANGSTON, GI FISCHER, J ASPIN, C TI INFRARED K-BAND OBSERVATIONS OF THE GRAVITATIONAL LENS 2016+112 SO ASTRONOMICAL JOURNAL LA English DT Article ID SYSTEM AB Infrared observations of the gravitational lens 2016 + 112 at the K band (lambda = 2.2-mu-m) are presented. The infrared image is dominated by the extended emission of the radio quiet foreground galaxy, which acts as the gravitational lens. Infrared flux is seen at the location of all three radio loud components of the system. Gaussian fits to the data yield K-band fluxes for all four components. To within the errors of the fit, the i - K colors of the radio loud images are similar, while the color of the foreground galaxy is closer to that expected for an elliptical galaxy with z approximately 1. The relative brightnesses of the 2016 + 112 components at K band are significantly different than the optical g-band brightnesses. The K-band observations suggest that the central galaxy makes the dominant contribution to the mass acting as the gravitational lens. A model of the gravitational lens as a single massive elliptical galaxy is presented. This model suggests that all radio loud components of 2016 + 112 can be explained as images of the background quasar and are not due to a second foreground galaxy, as indicated by earlier work. Radio wavelength observations at the X band (lambda = 3.6 cm) are included to show the compact radio structure of 2016 + 112, which also supports the single galaxy lens model. C1 USN, RES LAB, CTR ADV SPACE SENSING, WASHINGTON, DC 20375 USA. JOINT ASTRON CTR, UNITED KINGDOM INFRARED TELESCOPE, HILO, HI 96720 USA. RP LANGSTON, GI (reprint author), NATL RADIO ASTRON OBSERV, EDGEMONT RD, CHARLOTTESVILLE, VA 22903 USA. NR 11 TC 17 Z9 17 U1 0 U2 0 PU IOP PUBLISHING LTD PI BRISTOL PA DIRAC HOUSE, TEMPLE BACK, BRISTOL BS1 6BE, ENGLAND SN 0004-6256 J9 ASTRON J JI Astron. J. PD OCT PY 1991 VL 102 IS 4 BP 1253 EP 1257 DI 10.1086/115951 PG 5 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA GG675 UT WOS:A1991GG67500002 ER PT J AU CHAMBLISS, CR WALKER, RL AF CHAMBLISS, CR WALKER, RL TI A PHOTOELECTRIC INVESTIGATION OF THE ECLIPSING BINARY SV-TAURI SO ASTRONOMICAL JOURNAL LA English DT Article ID LIGHT CURVES AB SV Tauri is an Algol-type eclipsing binary with P = 2.d1669 and V = 9.m7 at maximum light. The primary minimum is 1.m1 deep, the secondary minimum 0.m1, and the eclipses are partial. Despite the fact that this star was discovered to be variable in 1908, no photoelectric observations were obtained for this system until the 1980's. Photoelectric UBV observations were obtained between 1981 and 1988 with the 0.4 m telescope No. 4 at KPNO and with the 1.0 m reflector of the USNO Flagstaff Station. The light curves were analyzed using both the WINK method and the SIMPLEX algorithm. SV Tauri proves to be a typical semidetached Algol-type system with the secondary component filling its Roche lobe. Earlier analyses, based on visual and photographic observations, indicated orbital eccentricity, but the observations and analyses in this study show that the orbit is circular. The spectral classes of the components are B9 V and G5 IV. The values derived for r1, r2, and the mass ratio (q) are 0.29, 0.27, and 0.28, respectively. C1 USN OBSERV,FLAGSTAFF,AZ 86002. RP CHAMBLISS, CR (reprint author), KUTZTOWN STATE UNIV,KUTZTOWN,PA 19530, USA. NR 29 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 0004-6256 J9 ASTRON J JI Astron. J. PD OCT PY 1991 VL 102 IS 4 BP 1409 EP 1416 DI 10.1086/115967 PG 8 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA GG675 UT WOS:A1991GG67500018 ER PT J AU HILTON, JL AF HILTON, JL TI THE MOTION OF MARS POLE .1. RIGID BODY PRECESSION AND NUTATION SO ASTRONOMICAL JOURNAL LA English DT Article ID INERTIA; EARTH; MOMENT; MODEL AB The total precession in longitude for a solid-core, rigid Mars model is found to be DELTA-PSI = -7".296 +/- 0".021 yr-1. This precession includes the motion resulting from the extremely long-period (> 10 000 yr) nutation components that result from changes in Mars' orbit with time. These same very long-period nutation components also contribute a "precession" in latitude of DELTA-epsilon = 0".4255 +/- 0".0012 yr-1. The nutation components in longitude with amplitudes larger than 0".001 consist of eight solar nutation terms and one nutation each contributed by the motions of the nodes of Phobos and Deimos and a single nutation from the direct gravitational torque of Jupiter. The nutation components in obliquity consist of six solar terms and one nutation term each from the motion of the nodes of Phobos and Deimos. The amplitudes and periods of the solar nutation terms are in agreement with the nutation found by Reasenberg & King [J. Geophys. Res., 84, 6231 (1979)]. The solar precession rate also agrees with Reasenberg and King's value with the two small corrections resulting from the change in the orientation of Mars' orbit with time added to it. A single nutation in longitude driven by Jupiter is the only significant planetary contribution at the milliarcsecond level. RP HILTON, JL (reprint author), USN OBSERV,34TH ST & MASSACHUSETTS AVE NW,WASHINGTON,DC 20392, USA. NR 32 TC 17 Z9 17 U1 0 U2 0 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0004-6256 J9 ASTRON J JI Astron. J. PD OCT PY 1991 VL 102 IS 4 BP 1510 EP 1527 DI 10.1086/115977 PG 18 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA GG675 UT WOS:A1991GG67500028 ER PT J AU CLIVER, EW CANE, HV FORREST, DJ KOOMEN, MJ HOWARD, RA WRIGHT, CS AF CLIVER, EW CANE, HV FORREST, DJ KOOMEN, MJ HOWARD, RA WRIGHT, CS TI SOLAR GAMMA-RAY-LINE FLARES, TYPE-II RADIO-BURSTS, AND CORONAL MASS EJECTIONS SO ASTROPHYSICAL JOURNAL LA English DT Article DE GAMMA RAYS; GENERAL; SHOCK WAVES; SUN FLARES; SUN PARTICLE EMISSION; SUN RADIO RADIATION ID ENERGETIC PARTICLE EVENTS; PROTON EVENTS; ACCELERATION; ASSOCIATIONS; ELECTRONS; EMISSION; PHASE; SUN AB We use a Big Flare Syndrome (BFS) test to substantiate earlier reports of a statistically significant association between nuclear gamma-ray-line (GRL) flares (observed by the Gamma Ray Spectrometer on the Solar Maximum Mission) and metric type II bursts from coronal shocks. The type II onset characteristically follows the onset of gamma-ray emission with a median delay of 2 minutes. We find that 70%-90% of GRL flares for which coronagraph data were available were associated with coronal mass ejections (CMEs). Gradual and impulsive GRL flares were equally well associated with CMEs. The CMEs were typically fast, with a median speed greater than 800 km s-1. We discuss the following possible "non-BFS" explanations for the GRL-type II association: (1) the "type II shock" accelerates GRL protons in a "second step" process as it traverses lowlying coronal loops, (2) the observed shocks are blast waves resulting from the sudden deposition of energy in the low corona signaled by the GRL event, and (3) a fast CME is the underlying independent cause of both GRL and type II emission from GRL flares. C1 NASA,GODDARD SPACE FLIGHT CTR,HIGH ENERGY ASTROPHYS LAB,GREENBELT,MD 20771. UNIV TASMANIA,DEPT PHYS,HOBART,TAS 7001,AUSTRALIA. UNIV NEW HAMPSHIRE,INST STUDY EARTH OCEANS & SPACE,DURHAM,NH 03824. USN,RES LAB,EO HULBERT CTR SPACE RES,WASHINGTON,DC 20375. AUSTRALIAN DEF SCI & TECHNOL ORG,ELECTR RES LAB,SALISBURY,SA 5108,AUSTRALIA. SFA INC,LANDOVER,MD 20785. RP CLIVER, EW (reprint author), PHILLIPS LAB,OL AA,PHG,BEDFORD,MA 01731, USA. NR 56 TC 3 Z9 3 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 OCT 1 PY 1991 VL 379 IS 2 BP 741 EP 750 DI 10.1086/170550 PN 1 PG 10 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA GH078 UT WOS:A1991GH07800032 ER PT J AU ATHAY, RG DERE, KP AF ATHAY, RG DERE, KP TI CHROMOSPHERIC AND TRANSITION REGION DIAGNOSTICS USING EMISSION-LINE INTENSITIES SO ASTROPHYSICAL JOURNAL LA English DT Article DE SUN CHROMOSPHERE; SUN MAGNETIC FIELDS; SUN SPECTRA; SUN TRANSITION REGION; ULTRAVIOLET SPECTRA ID APPROXIMATE CALCULATION; SOLAR; TEMPERATURE; OPACITY; LIMB AB EUV emission-line intensities from the HRTS experiment on Spacelab 2 are analyzed to determine the causes of intensity variations from point to point on the solar surface. Chromospheric lines of O I and transition region lines of C II, Si IV, and C IV exhibit saturation effects that limit the line intensities in the brighter regions. No such effect is found in lines of C I, Fe II, or Si III. The chromospheric lines saturate because the optical thickness exceeds the thermalization depth, whereas the transition region lines saturate because of the geometry of the unresolved fine structure. The latter is assumed to consist of elongated cylinder-like features oriented along magnetic lines of force that are mainly vertical. Saturation occurs when the optical thickness along the axis of the cylinders exceeds unity. Estimates based on the observed saturation effects give fill factors for the fine structure of 5 x 10(-3) and 0.4 at 10(5) K and 3 x 10(4) K, respectively. The corresponding lengths of the cylinders are estimated at 1000 km and 40 km at the two temperatures. It is argued that in both chromospheric and transition region lines changes in density, temperature, and the volume of the emitting material each play important roles in the intensity changes from the one point to another on the solar disk. Evidence suggests that changes in the volume of the emitting material overshadow the effects of density and temperature changes. Intensity ratios of line pairs are shown to provide a reliable basis for density diagnostics if both lines are free from saturation effects and if they are formed at similar temperatures. C1 USN, RES LAB, EO HULBURT CTR SPACE RES, WASHINGTON, DC 20375 USA. RP NATL CTR ATMOSPHER RES, HIGH ALTITUDE OBSERV, BOULDER, CO 80307 USA. NR 19 TC 13 Z9 13 U1 0 U2 0 PU IOP PUBLISHING LTD PI BRISTOL PA TEMPLE CIRCUS, TEMPLE WAY, BRISTOL BS1 6BE, ENGLAND SN 0004-637X EI 1538-4357 J9 ASTROPHYS J JI Astrophys. J. PD OCT 1 PY 1991 VL 379 IS 2 BP 776 EP + DI 10.1086/170553 PN 1 PG 1 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA GH078 UT WOS:A1991GH07800035 ER PT J AU WHINNERY, JE HAMILTON, RJ CAMMAROTA, JP AF WHINNERY, JE HAMILTON, RJ CAMMAROTA, JP TI TECHNIQUES TO ENHANCE SAFETY IN ACCELERATION RESEARCH AND FIGHTER AIRCREW TRAINING SO AVIATION SPACE AND ENVIRONMENTAL MEDICINE LA English DT Note ID GZ-INDUCED LOSS; CONSCIOUSNESS; CENTRIFUGE AB Acceleration (+Gz) research and aircrew training using human centrifuges involves considerable stress that can alter normal cardiovascular and neurologic function even in completely healthy individuals. It is clear that electrocardiographic rate, rhythm, and conduction disturbances are frequently associated with +Gz exposures. These cardiac changes can result in altered perfusion of the central nervous system (CNS) to an extent which exceeds that induced by the +Gz stress alone. Although centrifuge-based research and training have a proven record of overall safety, there is finite risk associated with such stressful exposures, and adverse events have been observed. It is, therefore, extremely important to continually develop improved avenues to enhance human safety during centrifuge exposure. We have implemented techniques that can be immediately employed by centrifuge medical personnel to reduce the potential for significant CNS embarrassment and possible injury. These include techniques to 1) reduce excessive parasympathetic tone that may result in marked bradycardia and transient asystole post +Gz stress, and 2) manually controlled inflation and pulsation of the anti-G suit to enhance CNS perfusion post +Gz stress. RP WHINNERY, JE (reprint author), USN,CTR AIR DEV,AERIAL COMBAT MANEUVERING ENHANCEMENT LAB,WARMINSTER,PA 18974, USA. NR 17 TC 1 Z9 1 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 OCT PY 1991 VL 62 IS 10 BP 989 EP 993 PG 5 WC Public, Environmental & Occupational Health; Medicine, General & Internal; Sport Sciences SC Public, Environmental & Occupational Health; General & Internal Medicine; Sport Sciences GA GG489 UT WOS:A1991GG48900015 PM 1764014 ER PT J AU BASON, R YACAVONE, D BELLENKES, AH AF BASON, R YACAVONE, D BELLENKES, AH TI DECOMPRESSION-SICKNESS - USN OPERATIONAL EXPERIENCE 1969-1989 SO AVIATION SPACE AND ENVIRONMENTAL MEDICINE LA English DT Note AB This report presents data on the U.S. Navy's experience in decompression sickness occurring in operational flight from 1 January 1969 to 30 December 1989. During these 21 years, decompression sickness was reported in 12 USN aircraft and involved 15 aircrew. The primary cause of decompression, as might be expected, was a loss of cabin or cockpit pressurization. The most common manifestation of decompression sickness was limb or joint pain although some crewmembers experienced various manifestations of neurological dysfunction. One crewmember experienced chokes. Of the 15 afflicted aircrew, 13 (87%) had complete remission of symptoms by the time they landed. Two crewmembers required compression therapy for resolution of symptoms. None of the reported symptoms were incapacitating and none of the aircraft involved crashed or received even minor damage. RP BASON, R (reprint author), USN,AVIAT PHYSIOL TRAINING SERV,DIV PHYSIOL,NAVAL AIR STN,BLDG SP-124,NORFOLK,VA 23511, USA. NR 10 TC 6 Z9 6 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 OCT PY 1991 VL 62 IS 10 BP 994 EP 996 PG 3 WC Public, Environmental & Occupational Health; Medicine, General & Internal; Sport Sciences SC Public, Environmental & Occupational Health; General & Internal Medicine; Sport Sciences GA GG489 UT WOS:A1991GG48900016 PM 1764015 ER PT J AU SMITH, DR GEER, IW WEINBECK, RS CHASTON, PR AF SMITH, DR GEER, IW WEINBECK, RS CHASTON, PR TI PROJECT ATMOSPHERE - AMS NOAA 1991 WORKSHOP FOR TEACHERS SO BULLETIN OF THE AMERICAN METEOROLOGICAL SOCIETY LA English DT Article C1 SUNY COLL BROCKPORT,DEPT EARTH SCI,BROCKPORT,NY 14420. NATL WEATHER SERV,CTR TRAINING,KANSAS CITY,MO 64124. RP SMITH, DR (reprint author), USN ACAD,DEPT OCEANOG,ANNAPOLIS,MD 21402, USA. NR 3 TC 10 Z9 10 U1 0 U2 0 PU AMER METEOROLOGICAL SOC PI BOSTON PA 45 BEACON ST, BOSTON, MA 02108-3693 SN 0003-0007 J9 B AM METEOROL SOC JI Bull. Amer. Meteorol. Soc. PD OCT PY 1991 VL 72 IS 10 BP 1547 EP 1550 PG 4 WC Meteorology & Atmospheric Sciences SC Meteorology & Atmospheric Sciences GA GL845 UT WOS:A1991GL84500008 ER PT J AU SZABO, E PREIS, LH BROWN, PH BIRRER, MJ AF SZABO, E PREIS, LH BROWN, PH BIRRER, MJ TI THE ROLE OF JUN AND FOS GENE FAMILY MEMBERS IN 12-O-TETRADECANOYLPHORBOL-13-ACETATE INDUCED HEMATOPOIETIC DIFFERENTIATION SO CELL GROWTH & DIFFERENTIATION LA English DT Article ID HUMAN MONOCYTIC DIFFERENTIATION; PROMYELOCYTIC LEUKEMIA-CELLS; TRANSCRIPTION FACTOR AP-1; PROTO-ONCOGENE FOS; C-JUN; RIBONUCLEIC-ACID; RAPID INDUCTION; GROWTH-FACTORS; EXPRESSION; ACTIVATION AB Terminal differentiation of the leukemic cell lines U-937 and HL-60 by 12-O-tetradecanoylphorbol-13-acetate is accompanied by marked changes in gene expression. In this study, we demonstrate that the expression of jun and fos gene family members is induced with variable kinetics during 12-O-tetradecanoylphorbol-13-acetate induced differentiation, with c-jun expression best paralleling differentiation. The generation of AP-1 complexes, as measured by DNA binding activity, closely parallels morphological differentiation. Furthermore, the ability of these complexes to regulate gene expression is demonstrated by increased transcription from an AP-1 driven reporter construct and marked increases in the expression of endogenous AP-1 regulated genes. Differentiation assays using water soluble phorbol esters reveal that differentiation becomes irreversible soon after AP-1 appears. This tight correlation between c-jun expression, the generation of AP-1 activity, and differentiation suggests a critical role for this gene and transcriptional complex during this process. C1 USN HOSP,NCI,MED ONCOL BRANCH,BLDG 8,ROOM 5101,BETHESDA,MD 20814. UNIFORMED SERV UNIV HLTH SCI,BETHESDA,MD 20814. NR 47 TC 78 Z9 78 U1 0 U2 0 PU AMER ASSOC CANCER RESEARCH PI PHILADELPHIA PA PUBLIC LEDGER BLDG, SUITE 816, 150 S. INDEPENDENCE MALL W., PHILADELPHIA, PA 19106 SN 1044-9523 J9 CELL GROWTH DIFFER JI Cell Growth Differ. PD OCT PY 1991 VL 2 IS 10 BP 475 EP 482 PG 8 WC Cell Biology SC Cell Biology GA GN381 UT WOS:A1991GN38100001 PM 1751404 ER PT J AU RHODES, DG SINGH, A AF RHODES, DG SINGH, A TI STRUCTURE OF POLYMERIZABLE LIPID BILAYERS .4. MIXTURES OF LONG-CHAIN DIACETYLENIC AND SHORT CHAIN SATURATED PHOSPHATIDYLCHOLINES AND ANALOGOUS ASYMMETRIC ISOMERS SO CHEMISTRY AND PHYSICS OF LIPIDS LA English DT Article DE PHOSPHATIDYLCHOLINE; DIACETYLENIC LIPIDS; POLYMERIZABLE LIPIDS; MIXED BILAYERS; INTERDIGITATED BILAYERS ID MONOLAYERS; MEMBRANES; BEHAVIOR; TUBULES AB Polymerization of 1,2-bis(tricosa-10,12-diynoyl)-sn-glycero-3-phosphocholine (DC8.9PC) is enhanced by addition of short-chain saturated phosphatidylcholines such as 1,2-dinonanoyl-sn-glycero-3-phosphocholine (DNPC). Because of well established constraints on the topochemical polymerisation process, we undertook structure-based experiments to determine the nature of this effect. Two hypotheses were tested: (a) that the DNPC crystalized the proximal (m) and disordered the distal (n) methylene segments of DC8.9PC, thus providing flexibility to accommodate the conformational change upon polymer formation, or (b) that the DNPC forced lateral displacement of DC8.9PC, which would then allow interdigitation of these segments with those of the opposing monolayer and potentially more crystalline alignment of the diacetylene. Low angle X-ray diffraction studies do not support the interdigitated chain model. However, these measurements also indicate that the two lipid species may be phase separated under many conditions. An analogous structure, 1-(tricosa-10,12-diynoyl)2-nonanoyl-sn-glycero-3-phosphocholine (C8.9NPC) did not polymerize, and low angle X-ray diffraction studies indicate that bilayers of this lipid were interdigitated such that the terminal methyl group of the tricosa-diynoyl chain on each lipid in the bilayer was adjacent to the diacetylenic moiety of a lipid on the opposing monolayer. Implications of these findings pertinent to identifying significant factors in polymerization of diacetylenic phospholipid bilayers are discussed. C1 USN,RES LAB,CTR BIOMOLEC SCI & ENGN,WASHINGTON,DC 20375. RP RHODES, DG (reprint author), UNIV CONNECTICUT,CTR HLTH,CTR BIOMOLEC STRUCT ANAL,DEPT RADIOL,FARMINGTON,CT 06032, USA. NR 20 TC 24 Z9 24 U1 0 U2 5 PU ELSEVIER SCI IRELAND LTD PI CLARE PA CUSTOMER RELATIONS MANAGER, BAY 15, SHANNON INDUSTRIAL ESTATE CO, CLARE, IRELAND SN 0009-3084 J9 CHEM PHYS LIPIDS JI Chem. Phys. Lipids PD OCT PY 1991 VL 59 IS 3 BP 215 EP 224 DI 10.1016/0009-3084(91)90021-3 PG 10 WC Biochemistry & Molecular Biology; Biophysics SC Biochemistry & Molecular Biology; Biophysics GA GH614 UT WOS:A1991GH61400003 PM 1804565 ER PT J AU LANDWEHR, C MCLEAN, J HEITMEYER, C AF LANDWEHR, C MCLEAN, J HEITMEYER, C TI DEFINING FORMALISM SO COMMUNICATIONS OF THE ACM LA English DT Letter RP LANDWEHR, C (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. RI Heitmeyer, Constance/F-6500-2011 NR 0 TC 1 Z9 1 U1 0 U2 0 PU ASSOC COMPUTING MACHINERY PI NEW YORK PA 1515 BROADWAY, NEW YORK, NY 10036 SN 0001-0782 J9 COMMUN ACM JI Commun. ACM PD OCT PY 1991 VL 34 IS 10 BP 15 EP 16 PG 2 WC Computer Science, Hardware & Architecture; Computer Science, Software Engineering; Computer Science, Theory & Methods SC Computer Science GA GH938 UT WOS:A1991GH93800005 ER PT J AU LUNDY, GM AF LUNDY, GM TI EUROPEAN FIBER OPTICS LAN 91 SO COMPUTER COMMUNICATIONS LA English DT Editorial Material RP LUNDY, GM (reprint author), USN,POSTGRAD SCH,DEPT COMP SCI,MONTEREY,CA 93940, USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0140-3664 J9 COMPUT COMMUN JI Comput. Commun. PD OCT PY 1991 VL 14 IS 8 BP 498 EP 498 DI 10.1016/0140-3664(91)90129-O PG 1 WC Computer Science, Information Systems; Engineering, Electrical & Electronic; Telecommunications SC Computer Science; Engineering; Telecommunications GA GK268 UT WOS:A1991GK26800007 ER PT J AU GOLDMAN, L AF GOLDMAN, L TI HISTORY OF SELF-EXPERIMENTATION IN DERMATOLOGY - SHOULD WE GO 1ST - SOMETIMES SO CUTIS LA English DT Article AB Because of its availability, the skin has been used over the years for self-experimentation. Many examples can be cited, including the heroic self-experiments of Carrion of Peru with verruga peruana and those of Goldberger with pellagra and Pediculoides ventricosus. My personal self-experimentation began with sensitization to Japanese lacquer. From that starting point I experimented with chemical warfare agents, cortisone versus hydrocortisone, bites of various arthropods, and finally, experiments with lasers. Some dermatologists will continue to do self-experimentation when they acquire infections from their patients. I believe that sometimes, for their patients' benefit, they should go first. C1 UNIV CINCINNATI,COLL MED,CINCINNATI,OH 45221. USN HOSP,DEPT DERMATOL,SAN DIEGO,CA 92134. NR 26 TC 2 Z9 2 U1 1 U2 1 PU EXCERPTA MEDICA INC PI NEW YORK PA 245 WEST 17TH STREET, NEW YORK, NY 10011 SN 0011-4162 J9 CUTIS JI Cutis PD OCT PY 1991 VL 48 IS 4 BP 338 EP 341 PG 4 WC Dermatology SC Dermatology GA GK903 UT WOS:A1991GK90300012 PM 1743069 ER PT J AU CONSTANTINE, NT SHEBA, MF CORWIN, AL DANAHY, RS CALLAHAN, JD WATTS, DM AF CONSTANTINE, NT SHEBA, MF CORWIN, AL DANAHY, RS CALLAHAN, JD WATTS, DM TI A SEROSURVEY FOR HTLV-I AMONG HIGH-RISK POPULATIONS AND NORMAL ADULTS IN EGYPT SO EPIDEMIOLOGY AND INFECTION LA English DT Article ID T-CELL-LEUKEMIA; VIRUS TYPE-I; PAPUA-NEW-GUINEA; TROPICAL SPASTIC PARAPARESIS; LYMPHOMA VIRUS; ENDEMIC REGION; ANTIBODIES; INFECTION; TRANSMISSION; PREVALENCE AB The prevalence of antibodies to human T-cell lymphotropic virus type I (HTLV-I) was determined in high-risk groups and normal adults in Egypt. Among 647 individuals tested, 6 (0.9%) were confirmed positive by western blot analysis. These included 2 (0.7%) of 279 drug addicts, 1 (3.3%) of 30 patients with sexually transmitted diseases, and 3 (2.2%) of 133 healthy individuals. Antibody was not detected in 47 blood recipients or 158 prostitutes. There was no correlation between sex or geographical location and HTLV-1 infection. Fifty-three of the 647 sera (8%) were initially reactive by ELISA, but only 12 sera were repeatedly reactive. Since only 4 of these repeatedly reactive sera were confirmed by the western blot, the frequency of false positives using the DuPont screening ELISA was 1.2% (8/643). Two additional sera. confirmed positive by western blot, had been reactive, but not repeatedly, by ELISA. In comparison to the prevalence of HTLV-I antibody among risk groups in many parts of the world, the prevalence in Egypt was low. C1 USN,MED RES UNIT 3,CAIRO,EGYPT. UNIV MARYLAND,DEPT PATHOL,BALTIMORE,MD 21201. NR 26 TC 8 Z9 8 U1 0 U2 0 PU CAMBRIDGE UNIV PRESS PI NEW YORK PA 40 WEST 20TH STREET, NEW YORK, NY 10011-4211 SN 0950-2688 J9 EPIDEMIOL INFECT JI Epidemiol. Infect. PD OCT PY 1991 VL 107 IS 2 BP 429 EP 433 PG 5 WC Public, Environmental & Occupational Health; Infectious Diseases SC Public, Environmental & Occupational Health; Infectious Diseases GA GN842 UT WOS:A1991GN84200019 PM 1936162 ER PT J AU CARBONE, D AF CARBONE, D TI FOCUSING IN ON P53 IN HEPATOCELLULAR-CARCINOMA SO HEPATOLOGY LA English DT Note ID CANCER; GENE; MUTATIONS; PROTEIN RP CARBONE, D (reprint author), USN HOSP BETHESDA,NCI,NAVY MED ONCOL BRANCH,BETHESDA,MD 20889, USA. NR 12 TC 2 Z9 2 U1 0 U2 0 PU W B SAUNDERS CO PI PHILADELPHIA PA INDEPENDENCE SQUARE WEST CURTIS CENTER, STE 300, PHILADELPHIA, PA 19106-3399 SN 0270-9139 J9 HEPATOLOGY JI Hepatology PD OCT PY 1991 VL 14 IS 4 BP 742 EP 744 DI 10.1016/0270-9139(91)90071-3 PN 1 PG 3 WC Gastroenterology & Hepatology SC Gastroenterology & Hepatology GA GH580 UT WOS:A1991GH58000029 PM 1655609 ER PT J AU BRZOSTOWSKA, M BROSSI, A FLIPPENANDERSON, JL AF BRZOSTOWSKA, M BROSSI, A FLIPPENANDERSON, JL TI CHIRAL PRODYES - SYNTHESIS AND FULL CHARACTERIZATION OF (S)-1-PHENYLETHYLAMIDES OF THE OPTICALLY-ACTIVE O-METHYLDIHYDROFLUORESCEINS SO HETEROCYCLES LA English DT Article ID DADF AB O-Dihydrofluorescein (3) on reaction with (S)-(-)-1-phenylethylamine afforded amide (5) as a mixture of diastereomers which resisted chromatographic separation. The mixture of amides (6) and (7), however, obtained from 5 by catalytic hydrogenation could be separated by hplc. The X-ray analysis of amide (6) showed that it has the (9S)-absolute configuration. This result attests that it is possible to obtain dihydrofluoresceins with differently substituted benzene rings in the form of enantiomers. C1 USN,RES LAB,DEPT NAVY,STRUCT MATTER LAB,WASHINGTON,DC 20375. RP BRZOSTOWSKA, M (reprint author), NIADDKD,STRUCT BIOL LAB,BETHESDA,MD 20892, USA. NR 5 TC 2 Z9 2 U1 0 U2 0 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0385-5414 J9 HETEROCYCLES JI Heterocycles PD OCT 1 PY 1991 VL 32 IS 10 BP 1969 EP 1972 PG 4 WC Chemistry, Organic SC Chemistry GA GR266 UT WOS:A1991GR26600011 ER PT J AU BAROUCH, E HOLLERBACH, U ORSZAG, SA BRADIE, B PECKERAR, M AF BAROUCH, E HOLLERBACH, U ORSZAG, SA BRADIE, B PECKERAR, M TI MODELING PROCESS LATITUDE IN UV PROJECTION LITHOGRAPHY SO IEEE ELECTRON DEVICE LETTERS LA English DT Article AB The degree to which critical performance parameters are stable against small variations in process parameters is called process latitude. In order to achieve manufacturability, processes must be developed which exhibit broad process latitude. It is costly and time-consuming to experimentally define process latitude over the full range of the parameter space. On the other hand, good models can allow a process engineer to search only the relevant regions of parameter space. In this letter, advanced computer models of UV microlithography are used to study the impact of the "notching phenomenon" (exposure enhancement near steps in the exposure plane) on process latitude. It is shown that notching effects give rise to a surprising, rapid degradation of resist development process latitude. C1 CLARKSON UNIV,DEPT MATH & COMP SCI,POTSDAM,NY 13676. USN,RES LAB,NANOELECTR PROC FACIL,WASHINGTON,DC 20375. RP BAROUCH, E (reprint author), PRINCETON UNIV,PRINCETON,NJ 08544, USA. NR 3 TC 7 Z9 7 U1 0 U2 1 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0741-3106 J9 IEEE ELECTR DEVICE L JI IEEE Electron Device Lett. PD OCT PY 1991 VL 12 IS 10 BP 513 EP 514 DI 10.1109/55.119174 PG 2 WC Engineering, Electrical & Electronic SC Engineering GA GG774 UT WOS:A1991GG77400001 ER PT J AU APPELL, GF CURTIN, TB AF APPELL, GF CURTIN, TB TI A SPECIAL ISSUE ON CURRENT MEASUREMENT - GUEST EDITORIAL SO IEEE JOURNAL OF OCEANIC ENGINEERING LA English DT Editorial Material C1 OFF NAVAL RES,ARCTIC SCI,ARLINGTON,VA 22217. RP APPELL, GF (reprint author), NOAA,DIV OCEAN SYST,REMOTE ACOUST DOPPLER SYST DEV PROJECT,ROCKVILLE,MD 20852, USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0364-9059 J9 IEEE J OCEANIC ENG JI IEEE J. Ocean. Eng. PD OCT PY 1991 VL 16 IS 4 BP 305 EP 306 PG 2 WC Engineering, Civil; Engineering, Ocean; Engineering, Electrical & Electronic; Oceanography SC Engineering; Oceanography GA GG370 UT WOS:A1991GG37000001 ER PT J AU TRUMP, CL AF TRUMP, CL TI SINGLE PING ADCP DATA SO IEEE JOURNAL OF OCEANIC ENGINEERING LA English DT Article DE ACOUSTIC DOPPLER CURRENT PROFILER (ADCP) ID VARIABILITY; SHEAR AB Because ADCP data are inherently noisy, they are usually presented in an averaged form. But a great deal can be learned, particularly about the ADCP system itself, by looking at single ping data. In this paper the author will present examples of analyses done on single ping data and show how these data can be used to understand system sampling, bin-to-bin independence, system noise, and the character of a secondary parameter-AGC. Some discussion of how these results are applied to processing procedures, and their verification, will be presented. RP TRUMP, CL (reprint author), USN,RES LAB,CODE 4220,WASHINGTON,DC 20375, USA. NR 10 TC 0 Z9 0 U1 0 U2 0 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0364-9059 J9 IEEE J OCEANIC ENG JI IEEE J. Ocean. Eng. PD OCT PY 1991 VL 16 IS 4 BP 382 EP 389 DI 10.1109/48.90902 PG 8 WC Engineering, Civil; Engineering, Ocean; Engineering, Electrical & Electronic; Oceanography SC Engineering; Oceanography GA GG370 UT WOS:A1991GG37000012 ER PT J AU ZAIDMAN, EG KODIS, MA AF ZAIDMAN, EG KODIS, MA TI EMISSION GATED DEVICE ISSUES SO IEEE TRANSACTIONS ON ELECTRON DEVICES LA English DT Article ID HIGH-EFFICIENCY; WAVE AB The requirement for high efficiency, high power RF sources in a compact package has suggested the use of a prebunched electron beam. In a gated emission device, the beam is bunched in the electron gun region prior to acceleration and transport into the RF extraction region. In this paper we review the basic dynamics of bunch formation and describe the gating technologies currently available for the production of a prebunched beam. Considerable insight into the basic physics of emission gating, such as beam dynamics and frequency spectra, is obtainable from numerical modeling. Some unresolved issues are presented for investigation. RP ZAIDMAN, EG (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 36 TC 20 Z9 20 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 OCT PY 1991 VL 38 IS 10 BP 2221 EP 2228 DI 10.1109/16.88502 PG 8 WC Engineering, Electrical & Electronic; Physics, Applied SC Engineering; Physics GA GG470 UT WOS:A1991GG47000005 ER PT J AU GANGULY, AK AHN, SY ZAIDMAN, EG GILMOUR, AS AF GANGULY, AK AHN, SY ZAIDMAN, EG GILMOUR, AS TI DESIGN PARAMETERS OF A HIGH-EFFICIENCY 1.7-GHZ GYROPENIOTRON AMPLIFIER SO IEEE TRANSACTIONS ON ELECTRON DEVICES LA English DT Article ID GYROTRON AB The feasibility of the gyropeniotron amplifier as a high-efficiency, high-power RF source to act as driver for accelerators in the 0.8-1.7-GHz frequency range is discussed. The klystrode is difficult to operate in this frequency range. Design parameters are given for a 1.7-GHz gyropeniotron operating with an axis-encircling beam (100 keV, 10 A) in a magnetron-type slotted waveguide. The external magnetic field required is 326 G. The calculated efficiency for second cyclotron harmonic operation is 78% with a cold beam and 66% with a beam having 2% axial velocity spread and 5% guiding center spread. The depressed collector technique can easily be applied to enhance the efficiency since the spent beam in a gyropeniotron has little velocity spread. C1 SUNY BUFFALO,BUFFALO,NY 14260. RP GANGULY, AK (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 15 TC 6 Z9 6 U1 0 U2 0 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0018-9383 J9 IEEE T ELECTRON DEV JI IEEE Trans. Electron Devices PD OCT PY 1991 VL 38 IS 10 BP 2229 EP 2233 DI 10.1109/16.88503 PG 5 WC Engineering, Electrical & Electronic; Physics, Applied SC Engineering; Physics GA GG470 UT WOS:A1991GG47000006 ER PT J AU HAAS, GA THOMAS, RE MARRIAN, CRK SHIH, A AF HAAS, GA THOMAS, RE MARRIAN, CRK SHIH, A TI RAPID TURN-ON OF SHELF-STORED TUBES - AN UPDATE SO IEEE TRANSACTIONS ON ELECTRON DEVICES LA English DT Article ID DISPENSER CATHODES; SURFACE CHARACTERIZATION; BAO; DESORPTION; FILMS; H2O; CO2 AB During shelf storage, cathode surfaces are poisoned as a result of adsorption of ambient gas residuals. The magnitude of the poisoning depends on the type of cathode and residual gas and follows the same order in which these different cathodes adsorbed the various ambient gases (i.e., sticking coefficients). Turn-on consists of several simultaneous processes. These involve the desorption of the poisoning compounds and the regeneration of a new Ba-O surface via the impregnant within the cathode matrix. The effects which various factors have on the reactivation time are also discussed. These include different exposures to poisoning gases, heating time and temperature, Ba impregnant concentration, Ba-O bonding, cathode types, surface composition, and pore spacing. In addition, from analysis of low-energy interatomic and valence Auger data, the surface configurations were determined during various stages of poisoning and activation. C1 USN,RES LAB,WASHINGTON,DC 20375. RP HAAS, GA (reprint author), USN,RES LAB,CODE 6840,BK SYST,WASHINGTON,DC 20375, USA. NR 13 TC 8 Z9 8 U1 0 U2 2 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0018-9383 J9 IEEE T ELECTRON DEV JI IEEE Trans. Electron Devices PD OCT PY 1991 VL 38 IS 10 BP 2244 EP 2251 DI 10.1109/16.88506 PG 8 WC Engineering, Electrical & Electronic; Physics, Applied SC Engineering; Physics GA GG470 UT WOS:A1991GG47000009 ER PT J AU JENSEN, KL BUOT, FA AF JENSEN, KL BUOT, FA TI THE METHODOLOGY OF SIMULATING PARTICLE TRAJECTORIES THROUGH TUNNELING STRUCTURES USING A WIGNER DISTRIBUTION APPROACH SO IEEE TRANSACTIONS ON ELECTRON DEVICES LA English DT Article ID SELF-CONSISTENT; DEVICES; EQUILIBRIUM AB Understanding and describing steady-state and transient tunneling behavior are necessary for determining the fundamental transport properties and speed performance limits of electronic devices based on field emitter arrays. The Wigner distribution approach is used as a first step in developing a theoretical and calculational methodology applicable to a wide class of quantum tunneling problems. The tunneling behavior in nanostructure field emitters is fundamentally similar to the tunneling behavior in other tunneling structures, e.g., resonant tunneling diodes (RTD's), where a large amount of experimental data exist. A modified relaxation time approximation is used for the scattering. Self-consistency is implemented, for the first time in fully time-dependent calculations, to investigate both the steady-state and transient behavior in RTD's. Of particular interest is their ultra-fast switching times (approximately 0.1 ps), which is comparable to that promised in micrometer scale vacuum devices based on field emitter arrays. A methodology for constructing quantum "particle trajectories" is presented with the long-term goal of incorporating them into a particle Monte Carlo simulation. The trajectories for an RTD are presented and their behavior, as a function of scattering and self-consistency, is shown to be consistent with the steady-state current-voltage/quantum well electron density characteristics of the RTD, and with the response of the RTD to a sudden bias switch. The trajectories also exhibit a conservation-of-energy-like behavior. The trajectory formulation is thus shown to be potentially useful for incorporating into a multidimensional particle Monte Carlo simulation of quantum-based devices in which the tunneling region is small compared to the dimensions of the device, as is the case with heterojunctions and nanostructure field emitters. 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 28 TC 47 Z9 48 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 0018-9383 J9 IEEE T ELECTRON DEV JI IEEE Trans. Electron Devices PD OCT PY 1991 VL 38 IS 10 BP 2337 EP 2347 DI 10.1109/16.88522 PG 11 WC Engineering, Electrical & Electronic; Physics, Applied SC Engineering; Physics GA GG470 UT WOS:A1991GG47000025 ER PT J AU SCHWIRZKE, FR AF SCHWIRZKE, FR TI VACUUM BREAKDOWN ON METAL-SURFACES SO IEEE TRANSACTIONS ON PLASMA SCIENCE LA English DT Article; Proceedings Paper CT 14TH INTERNATIONAL SYMP ON DISCHARGES AND ELECTRICAL INSULATION IN VACUUM ( ISDEIV ) CY SEP 17-20, 1990 CL SANTA FE, NM SP SANDIA NATL LABS, LOS ALAMOS NATL LAB, UNIV NEW MEXICO, TEXAS TECH UNIV, MAXWELL LABS, PHYS INT, TITAN CORP, PULSE SCI DIV, USN, NAVAL RES LAB, PLASMA PHYS DIV, USN, NAVAL SURFACE WARFARE CTR, US DEPT DEF, DEF NUCL AGCY ID EMISSION AB Breakdown and plasma formation on surfaces are fundamental processes in many areas of pulsed power technology. The initial plasma formation on the surface of a cathode of a vacuum diode, vacuum arc, and many other discharges is highly nonuniform. Micron-sized cathode spots form within nanoseconds. The concept of explosive electron emission from a cathode spot is well established in the literature. However, the details of the breakdown process were not well understood. Unipolar arcing represents a discharge form which easily leads to explosive plasma formation. Power dissipation for an arc is considerably higher than for field-emitted or space-charge-limited current flow. Using a laser-produced plasma, it has been demonstrated that unipolar arcs ignite and burn on a nanosecond time scale without any external electric field being applied. Similar unipolar arc craters have now been observed on the cathode surface of a pulsed vacuum diode with an externally applied field of 0.5 MV/cm. The experimental results show that cathodes spots are formed by unipolar arcing. The localized buildup of plasma above an electron-emitting spot naturally leads to a pressure gradient and electric field distribution which drives the unipolar arc. The high current density of an unipolar arc provides explosive plasma formation. RP SCHWIRZKE, FR (reprint author), USN,POSTGRAD SCH,DEPT PHYS,MONTEREY,CA 93943, USA. NR 14 TC 34 Z9 34 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 0093-3813 J9 IEEE T PLASMA SCI JI IEEE Trans. Plasma Sci. PD OCT PY 1991 VL 19 IS 5 BP 690 EP 696 DI 10.1109/27.108400 PG 7 WC Physics, Fluids & Plasmas SC Physics GA GT576 UT WOS:A1991GT57600003 ER PT J AU KIRKPATRICK, DA SCHOEN, PE STOCKTON, WB PRICE, R BARAL, S KAHN, BE SCHNUR, JM LEVINSON, M DITCHEK, BM AF KIRKPATRICK, DA SCHOEN, PE STOCKTON, WB PRICE, R BARAL, S KAHN, BE SCHNUR, JM LEVINSON, M DITCHEK, BM TI MEASUREMENTS OF VACUUM FIELD-EMISSION FROM BIO-MOLECULAR AND SEMICONDUCTOR-METAL EUTECTIC COMPOSITE MICROSTRUCTURES SO IEEE TRANSACTIONS ON PLASMA SCIENCE LA English DT Article; Proceedings Paper CT 14TH INTERNATIONAL SYMP ON DISCHARGES AND ELECTRICAL INSULATION IN VACUUM ( ISDEIV ) CY SEP 17-20, 1990 CL SANTA FE, NM SP SANDIA NATL LABS, LOS ALAMOS NATL LAB, UNIV NEW MEXICO, TEXAS TECH UNIV, MAXWELL LABS, PHYS INT, TITAN CORP, PULSE SCI DIV, USN, NAVAL RES LAB, PLASMA PHYS DIV, USN, NAVAL SURFACE WARFARE CTR, US DEPT DEF, DEF NUCL AGCY ID ELECTRON-BEAMS; CATHODES; TUBULES AB We present designs, calculations, and initial data from a program investigating the use of bio-molecular and eutectic composite microstructures as vacuum field emission cathodes. Calculations, supported by the initial data, indicate that these electron sources should be capable of macroscopic beam current densities J greater-than-or-equal-to 100 A/cm2 without the formation of a surface plasma. The absence of a plasma allows these cathodes to operate as a long-pulse to dc electron sources. These composite materials are processed to produce surface structures which consist of rod-like tips protruding from a uniform base, where the protruding rods are approximately 0.5-mu-m in diameter by approximately 10-mu-m tall, with an average surface density of > 10(6) tips/cm2. Such structures are essentially microanalogs of the velvet cathodes which have found widespread use in the exploding field-emission cathode domain. However, unlike the velvet cathodes, the aim of the present research is the controlling of the surface emission and preventing the formation of surface plasma. The present designs seek to avoid the formation of surface plasma by forcing the current emitted from the tips to transit a thin layer of silicon. The natural high-field current-limiting nature of the silicon serves to prevent the ablation of the tip structure and the subsequent formation of cathode plasma. Initial data obtained with these microstructures has demonstrated Fowler-Nordheim characteristic emission. With a final surface coating of amorphous, p-doped silicon, the bio-molecular composite cathodes have demonstrated stable dc (10 s, +/- 10% p-p) current densities of approximately 100 mA/cm2, and the eutectic composites cathodes have demonstrated similarly stable dc current densities of approximately 1 A/cm2. It is anticipated that using crystalline or polycrystalline n-type silicon coatings can increase these values to greater than 100 A/cm2. C1 USN,RES LAB,CTR BIOMOLEC SCI & ENGN,WASHINGTON,DC 20375. USN,RES LAB,DW OPT SCI,WASHINGTON,DC 20375. GTE LABS INC,DEPT ELECTR MAT,WALTHAM,MA 02254. RP KIRKPATRICK, DA (reprint author), SCI APPLICAT INT CORP,APPL PHYS OPERAT,MCLEAN,VA 22102, USA. NR 25 TC 9 Z9 11 U1 0 U2 2 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0093-3813 J9 IEEE T PLASMA SCI JI IEEE Trans. Plasma Sci. PD OCT PY 1991 VL 19 IS 5 BP 749 EP 756 DI 10.1109/27.108410 PG 8 WC Physics, Fluids & Plasmas SC Physics GA GT576 UT WOS:A1991GT57600013 ER PT J AU WEBER, BV COMMISSO, RJ GOODRICH, PJ GROSSMANN, JM HINSHELWOOD, DD KELLOGG, JC OTTINGER, PF AF WEBER, BV COMMISSO, RJ GOODRICH, PJ GROSSMANN, JM HINSHELWOOD, DD KELLOGG, JC OTTINGER, PF TI INVESTIGATION OF PLASMA OPENING SWITCH CONDUCTION AND OPENING MECHANISMS SO IEEE TRANSACTIONS ON PLASMA SCIENCE LA English DT Article; Proceedings Paper CT 14TH INTERNATIONAL SYMP ON DISCHARGES AND ELECTRICAL INSULATION IN VACUUM ( ISDEIV ) CY SEP 17-20, 1990 CL SANTA FE, NM SP SANDIA NATL LABS, LOS ALAMOS NATL LAB, UNIV NEW MEXICO, TEXAS TECH UNIV, MAXWELL LABS, PHYS INT, TITAN CORP, PULSE SCI DIV, USN, NAVAL RES LAB, PLASMA PHYS DIV, USN, NAVAL SURFACE WARFARE CTR, US DEPT DEF, DEF NUCL AGCY ID STORAGE AB Plasma opening switch techniques have been developed for pulsed power applications to exploit the advantages of electrical energy storage in a vacuum inductor compared to conventional, capacitive-based energy storage. Experiments are described that demonstrate the successful application of these techniques in conduction time ranges from 50 ns to over 1-mu-s. Physics understanding of the conduction and opening mechanisms is far from complete; however, many insights have been gained from experiments and theory. Measurements of current distribution, plasma density, and ion emission indicate that conduction and opening mechanisms differ for 50 ns and 1-mu-s conduction times. For the 50 ns conduction time case, switching begins at a current level close to the bipolar emission limit, and opening could occur primarily by erosion. In the 1-mu-s conduction time case, limited hydrodynamic plasma displacement implies far higher plasma density than is required by the bipolar emission limit. Magnetic pressure is required to augment erosion to generate the switch gap inferred from experiments. C1 JAYCOR,VIENNA,VA. RP WEBER, BV (reprint author), USN,RES LAB,DIV PLASMA PHYS,PULSED POWER PHYS BRANCH,4555 OVERLOOK AVE,WASHINGTON,DC 20375, USA. NR 16 TC 44 Z9 47 U1 0 U2 0 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0093-3813 J9 IEEE T PLASMA SCI JI IEEE Trans. Plasma Sci. PD OCT PY 1991 VL 19 IS 5 BP 757 EP 766 DI 10.1109/27.108411 PG 10 WC Physics, Fluids & Plasmas SC Physics GA GT576 UT WOS:A1991GT57600014 ER PT J AU Williams, SM Hoft, RG AF Williams, Stephen M. Hoft, Richard G. TI Adaptive Frequency Domain Control of PWM Switched Power Line Conditioner SO IEEE TRANSACTIONS ON POWER ELECTRONICS LA English DT Article AB An active power line conditioner (PLC) is recommended which minimizes harmonic current in the ac line and improves power factor to unity. A six switch pulse width modulated current source inverter implements the active PLC. Simulation results of the PLC adaptive frequency domain control using an innovative PWM switching algorithm are presented. C1 [Williams, Stephen M.] US Navy, Postgrad Sch, Code EC-WL, Monterey, CA 93943 USA. [Hoft, Richard G.] Univ Missouri, Power Elect Res Ctr, Columbia, MO 65211 USA. RP Williams, SM (reprint author), US Navy, Postgrad Sch, Code EC-WL, Monterey, CA 93943 USA. NR 7 TC 100 Z9 108 U1 0 U2 1 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI PISCATAWAY PA 445 HOES LANE, PISCATAWAY, NJ 08855-4141 USA SN 0885-8993 EI 1941-0107 J9 IEEE T POWER ELECTR JI IEEE Trans. Power Electron. PD OCT PY 1991 VL 6 IS 4 BP 665 EP 670 DI 10.1109/63.97766 PG 6 WC Engineering, Electrical & Electronic SC Engineering GA V43AF UT WOS:000209653600013 ER PT J AU BECKER, CAL ALQALLAF, SA COOPER, JC AF BECKER, CAL ALQALLAF, SA COOPER, JC TI REACTIONS OF DECAKIS(ISOPROPYLISOCYANIDE)DICOBALT(II) COMPLEXES WITH TERTIARY PHOSPHINE-LIGANDS SO INORGANICA CHIMICA ACTA LA English DT Article ID SUBSTITUTION; PENTAKIS(ARYLISOCYANIDE)COBALT(I) AB Reaction of [Co2(CNCHMe2)10]X4.nH2O (X = ClO4, BF4) with triarylphosphines and substituted trialkylphosphines products disubstituted Co(I) complexes, [Co(CNCHMe2)3(PR3)2]X; R = C6H5, C6H4Cl-p, C6H4OMe-p, CH2C6H5, NMe2, CH2CH2CN. These reduction/ligand-substitution reactions are analogous to those of [Co(CNCMe3)4H2O](ClO4)2. Reaction with unsubstituted trialkylphosphines produces Co(III) complexes, [Co(CNCHMe2)4(PR3)2]X3, R = C4H9-n, C6H13-n; in disproportionation reaction from which the Co(I) complex is not recovered: [Co2(CNCHMe2)10]X4 + 4PR3 --> [Co(CNR)4(PR3)2]X3 + [Co(CNR)3(PR3)2]X + 3CNR. Solution properties (nu(-N = C), electronic spectra, LAMBDA-M) are compared for CNCHMe2 and CNCMe3 complexes. The Co(I) complexes are 1:1 electrolytes in CH3CN, CH3NO2, CH3C(O)CH3 and CH2Cl2; the Co(III) complexes are 3:1 electrolytes in CH3CN and CH3NO2, but exhibit increasing ion-pairing in acetone and CH2Cl2. The nu(-N = C) suggest decreasing pi*-acceptance in the order: CNCHMe2 >> P(C6H4Cl-p)3 > P(C6H5)3 greater-than-or-equal-to P(CH2CH2CN)3 > P(C6H4OMe-p)3 > P(CH2Ph)3 > P(NMe2)3. Solution structure for [Co(CNCHMe2)3(PR3)2]X is believed to be distorted trigonal bipyramidal, but rigorous D4h for [Co(CNCHMe2)4(PR3)2]X3. C1 USN,RES LAB,DIV CHEM,WASHINGTON,DC 20375. RP BECKER, CAL (reprint author), UNIV BAHRAIN,DEPT CHEM,POB 32038,ISA TOWN,BAHRAIN. NR 23 TC 28 Z9 28 U1 0 U2 0 PU ELSEVIER SCIENCE SA LAUSANNE PI LAUSANNE 1 PA PO BOX 564, 1001 LAUSANNE 1, SWITZERLAND SN 0020-1693 J9 INORG CHIM ACTA JI Inorg. Chim. Acta PD OCT 1 PY 1991 VL 188 IS 1 BP 99 EP 106 PG 8 WC Chemistry, Inorganic & Nuclear SC Chemistry GA GT437 UT WOS:A1991GT43700018 ER PT J AU SUBRAHMANYAM, MB AF SUBRAHMANYAM, MB TI NECESSARY CONDITIONS FOR OPTIMAL DISTURBANCE REJECTION IN LINEAR-SYSTEMS SO INTERNATIONAL JOURNAL OF CONTROL LA English DT Article ID INTEGRAL-INEQUALITIES; EQUATION AB Disturbance rejection is an important factor in the synthesis of controllers for several practical systems. In this paper we derive necessary conditions which need to be satisfied by the controller in order to yield maximum disturbance rejection. Necessary conditions for maximum disturbance rejection are also derived in the case of an observer-based controller. These conditions are useful in the synthesis of a controller that maximizes the disturbance rejection capacity of the system. The problem considered has connections to H-infinity control theory. An example is given. RP SUBRAHMANYAM, MB (reprint author), USN,CTR AIR DEV,FLIGHT CONTROL,CODE 6012,WARMINSTER,PA 18974, USA. NR 15 TC 0 Z9 0 U1 1 U2 2 PU TAYLOR & FRANCIS LTD PI LONDON PA ONE GUNDPOWDER SQUARE, LONDON, ENGLAND EC4A 3DE SN 0020-7179 J9 INT J CONTROL JI Int. J. Control PD OCT PY 1991 VL 54 IS 4 BP 999 EP 1014 DI 10.1080/00207179108934196 PG 16 WC Automation & Control Systems SC Automation & Control Systems GA GE539 UT WOS:A1991GE53900013 ER PT J AU KNORR, JB MORUA, ML AF KNORR, JB MORUA, ML TI A CIRCUIT MODEL FOR THE INDUCTIVE STRIP IN HOMOGENEOUS FINLINE SO INTERNATIONAL JOURNAL OF MICROWAVE AND MILLIMETER-WAVE COMPUTER-AIDED ENGINEERING LA English DT Article AB This article describes a circuit model for infinitesimally thin inductive strips centered in homogeneous finline. The model is valid for 0.1 less-than-or-equal-to W/b less-than-or-equal-to 1.0, 0.01 less-than-or-equal-to T/a, and 0.4 less-than-or-equal-to b/a less-than-or-equal-to 0.5 when frequency is in the normal operating band for the rectangular waveguide shield. The error is less than 2.5%. RP KNORR, JB (reprint author), USN,POSTGRAD SCH,DEPT ELECT & COMP ENGN,MONTEREY,CA 93943, USA. NR 4 TC 0 Z9 0 U1 0 U2 0 PU JOHN WILEY & SONS INC PI NEW YORK PA 605 THIRD AVE, NEW YORK, NY 10158-0012 SN 1050-1827 J9 INT J MICROWAVE MILL JI Int. J. Microw. Millimeter-Wave Comput.-Aided Eng. PD OCT PY 1991 VL 1 IS 4 BP 395 EP 402 DI 10.1002/mmce.4570010409 PG 8 WC Computer Science, Interdisciplinary Applications; Engineering, Electrical & Electronic SC Computer Science; Engineering GA GG168 UT WOS:A1991GG16800007 ER PT J AU KIMES, DS HARRISON, PR RATCLIFFE, PA AF KIMES, DS HARRISON, PR RATCLIFFE, PA TI A KNOWLEDGE-BASED EXPERT SYSTEM FOR INFERRING VEGETATION CHARACTERISTICS SO INTERNATIONAL JOURNAL OF REMOTE SENSING LA English DT Article ID REFLECTANCE FACTOR DISTRIBUTIONS; HEMISPHERICAL REFLECTANCE; CANOPY REFLECTANCE; SURFACE; TRANSPIRATION; RADIOMETER; RADIANCE; CLIMATE; ALBEDO; NADIR AB The overall goal of the research is to develop a robust extraction technique for inferring physical and biological surface properties of vegetation using nadir and/or directional reflectance data as input. A prototype knowledge-based expert system VEG is described that concentrates on extracting spectral hemispherical reflectance using any combination of nadir and/or directional reflectance data as input. VEG is designed to facilitate expansion to handle other inferences regarding vegetation properties such as total hemispherical reflectance, per cent ground cover, leaf area index, biomass, and photosynthetic capacity. This approach is more accurate and robust than conventional extraction techniques developed by the investigator and others. VEG combines methods from remote sensing and Artificial Intelligence (AI). It integrates input spectral measurements with diverse knowledge bases available from the literature, data sets of directional reflectance measurements, and form experts, into an intelligent and efficient system for making vegetation inferences. VEG accepts spectral data of an unknown target as input, determines the best strategy or strategies for inferring hemispherical reflectance, applies the strategy or strategies to the target data, and provides a rigorous estimate of the accuracy of the inference. VEG is also intended to become a valuable research tool with provisions for testing and developing new extraction techniques on an internal spectral data base, for browsing and analysis (multiple plotting schemes) of the data in the system's spectral data base, and for the development of discrimination learning algorithms that discriminate the spectral and directional reflectance relationships between user-defined vegetation classes. C1 USN ACAD,ANNAPOLIS,MD 21402. JORGE SCI CORP,ARLINGTON,VA 22202. RP KIMES, DS (reprint author), NASA,GODDARD SPACE FLIGHT CTR,GREENBELT,MD 20771, USA. NR 43 TC 22 Z9 25 U1 1 U2 6 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 OCT PY 1991 VL 12 IS 10 BP 1987 EP 2020 PG 34 WC Remote Sensing; Imaging Science & Photographic Technology SC Remote Sensing; Imaging Science & Photographic Technology GA GH736 UT WOS:A1991GH73600001 ER PT J AU GIOVANOLA, JH KLOPP, RW KIRKPATRICK, SW MCDONALD, WW AF GIOVANOLA, JH KLOPP, RW KIRKPATRICK, SW MCDONALD, WW TI DYNAMIC FRACTURE OF WELDED-JOINTS SO JOURNAL DE PHYSIQUE III LA English DT Article; Proceedings Paper CT 3RD INTERNATIONAL CONF ON MECHANICAL AND PHYSICAL BEHAVIOUR OF MATERIALS UNDER DYNAMIC LOADING ( DYMAT 91 ) CY OCT 14-18, 1991 CL STRASBOURG, FRANCE SP MINIST DEF FRANCE, MINIST RECH & TECHNOL FRANCE, MINIST AFFAIRES ETRANGERES FRANCE, DELEGAT GEN ARMEMENT, CNRS, CEA AB This paper presents an experimental and analytical investigation of dynamic fracture of T-shaped welded joints (stiffner on a plate) in a high strength steel. A fracture test was designed in which strain rates of several thousand per second can be reached in the weldment region by loading the specimen with tamped explosive. Test conditions can be reliably controlled by adjusting the thickness of the explosive and the density and thickness of the tamping material. The measured initial specimen plate velocity is used as input for finite element simulations of the experiments to calculate the stress and strain and fracture damage histories in the fracture region. Experiments on two specimen sizes were performed to evaluate the effect of geometric scaling of the size on fracture of the weldments. For the two sizes investigated, fracture conditions scaled geometrically. The experimental results were in good agreement with the results of an analysis that used a rate independent, statically calibrated local fracture model to describe fracture by ductile void growth. This agreement suggests that fracture damage in weldments of this particular steel is not very rate sensitive. C1 USN,CTR SURFACE WARFARE,WHITE OAK LAB,SILVER SPRING,MD 20903. RP GIOVANOLA, JH (reprint author), SRI INT,333 RAVENSWOOD AVE,MENLO PK,CA 94025, USA. NR 3 TC 0 Z9 0 U1 0 U2 0 PU EDITIONS PHYSIQUE PI LES ULIS CEDEX PA Z I DE COURTABOEUF AVE 7 AV DU HOGGAR, BP 112, 91944 LES ULIS CEDEX, FRANCE SN 1155-4339 J9 J PHYS IV JI J. Phys. IV PD OCT PY 1991 VL 1 IS C3 BP 565 EP 572 DI 10.1051/jp4:1991379 PG 8 WC Physics, Multidisciplinary SC Physics GA GG302 UT WOS:A1991GG30200080 ER PT J AU BROWN, DB SAKS, NS AF BROWN, DB SAKS, NS TI TIME-DEPENDENCE OF RADIATION-INDUCED INTERFACE TRAP FORMATION IN METAL-OXIDE-SEMICONDUCTOR DEVICES AS A FUNCTION OF OXIDE THICKNESS AND APPLIED FIELD SO JOURNAL OF APPLIED PHYSICS LA English DT Article ID GATE MOS DEVICES; SI-SIO2 INTERFACE; STATE GENERATION; HYDROGEN; BUILDUP; SILICON; CAPACITORS; IRRADIATION; DEFECTS; CHARGE AB This work is a study of the formation mechanisms of interface traps (N(it)) in metal-oxide-semiconductor devices. The time-dependence of the N(it) formation has been measured as a function of oxide thickness following a short radiation pulse. The N(it) formation time is found to increase as t(ox)2.6 when the gate bias is negative during irradiation and positive afterward. This result is in excellent agreement with predictions of a hydrogen transport model where drift of hydrogen ions (H+) is the rate-limiting step. When the gate bias during irradiation is positive, interpretation of the correlation between data and model suggests that the hydrogen ions are preferentially created near the Si-SiO2 interface. Finally, the N(it) formation time is found to decrease with increasing oxide field as E(ox)-1.73. This result is compatible with the hydrogen transport model if the average displacement per hop is assumed to be proportional to E(m). RP BROWN, DB (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 50 TC 109 Z9 109 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 OCT 1 PY 1991 VL 70 IS 7 BP 3734 EP 3747 DI 10.1063/1.349226 PG 14 WC Physics, Applied SC Physics GA GJ675 UT WOS:A1991GJ67500050 ER PT J AU RAO, MV HONG, WP CANEAU, C CHANG, GK PAPANICOLAOU, N DIETRICH, HB AF RAO, MV HONG, WP CANEAU, C CHANG, GK PAPANICOLAOU, N DIETRICH, HB TI IN0.53GA0.47AS METAL-SEMICONDUCTOR-METAL PHOTODETECTOR USING PROTON BOMBARDED P-TYPE MATERIAL SO JOURNAL OF APPLIED PHYSICS LA English DT Note ID HIGH-PERFORMANCE; CONTACTS AB Metal-semiconductor-metal (MSM) photodetectors have been fabricated using as-grown and proton-bombarded p-type In0.53Ga0.47As. Proton bombardment caused a decrease in the dark current, an increase in the breakdown voltage, and an improvement in the speed of the MSM detector. The dark current of the MSM detector with 3 x 10(15) cm-3 proton bombardment is 10 nA at 2 V and 300 nA at 5-V bias. The dc responsivity is 0.7 A/W and impulse response full width at half maximum is 160 ps for 1.3-mu-m radiation at 5 V bias. C1 BELLCORE,RED BANK,NJ 07701. USN,RES LAB,WASHINGTON,DC 20375. RP RAO, MV (reprint author), GEORGE MASON UNIV,DEPT ELECT & COMP ENGN,FAIRFAX,VA 22030, USA. NR 8 TC 25 Z9 25 U1 0 U2 0 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0021-8979 J9 J APPL PHYS JI J. Appl. Phys. PD OCT 1 PY 1991 VL 70 IS 7 BP 3943 EP 3945 DI 10.1063/1.349205 PG 3 WC Physics, Applied SC Physics GA GJ675 UT WOS:A1991GJ67500084 ER PT J AU STOUCH, TR WARD, KB ALTIERI, A HAGLER, AT AF STOUCH, TR WARD, KB ALTIERI, A HAGLER, AT TI SIMULATIONS OF LIPID CRYSTALS - CHARACTERIZATION OF POTENTIAL-ENERGY FUNCTIONS AND PARAMETERS FOR LECITHIN MOLECULES SO JOURNAL OF COMPUTATIONAL CHEMISTRY LA English DT Article ID DYNAMICS SIMULATION; FORCE-FIELD; BILAYER-MEMBRANE; CONFORMATION; MONOLAYERS; DISORDER; PACKING; PEPTIDE; MODEL AB We evaluate an empirical potential energy function and associated parameters for classical molecular dynamics simulations of lecithins, a common class of lipid. The physical accuracy of the force field was tested through its application to molecular dynamics simulations of the known crystal structures of lipid molecules. Average atomic positions and molecular conformation are well maintained during the simulations despite considerable thermal motion. Calculated isotropic temperature factors correlate highly with those from experiment. C1 AGOURON INST, LA JOLLA, CA 92031 USA. USN, RES LAB, WASHINGTON, DC 20375 USA. NR 41 TC 66 Z9 66 U1 1 U2 4 PU WILEY-BLACKWELL PI HOBOKEN PA 111 RIVER ST, HOBOKEN 07030-5774, NJ USA SN 0192-8651 EI 1096-987X J9 J COMPUT CHEM JI J. Comput. Chem. PD OCT PY 1991 VL 12 IS 8 BP 1033 EP 1046 DI 10.1002/jcc.540120816 PG 14 WC Chemistry, Multidisciplinary SC Chemistry GA GH442 UT WOS:A1991GH44200015 ER PT J AU CANRIGHT, D DAVIS, SH AF CANRIGHT, D DAVIS, SH TI BUOYANCY EFFECTS OF A GROWING, ISOLATED DENDRITE SO JOURNAL OF CRYSTAL GROWTH LA English DT Article ID GROWTH; CONVECTION AB An axisymmetric dendrite of pure material solidifies downward into an undercooled melt. Surface energy and kinetic undercooling are negligible. The Ivantsov [Dokl. Akad. Nauk SSSR 58 (1947) 567] parabolic dendrite is modified by buoyant convection. We construct an approximate solution to the growth/convection problem in powers of a buoyancy parameter G. The solution depends on Prandtl number P and Stefan number S (undercooling). When P and/or S are large enough, buoyancy enhances growth and distorts the dendrite by sharpening the tip and widening the base. These results compare well with the experiments on succinonitrile (P = 23) of Huang and Glicksman [Acta Met. 29 (1981) 701] and the local theory of Ananth and Gill [J. Crystal Growth 91 (1988) 587] up to G almost-equal-to 1000, but overpredict convective effects for larger G. When P and S are small enough, buoyancy slows growth and flattens the tip. Physical explanations are given for the differences in buoyant effects at different P. The results suggest that near-tip effects of buoyancy should be different in metallics than in organics. C1 NORTHWESTERN UNIV,MCCORMICK SCH ENGN & APPL SCI,EVANSTON,IL 60208. RP CANRIGHT, D (reprint author), USN,POSTGRAD SCH,DEPT MATH,CODE MACA,MONTEREY,CA 93943, USA. RI Davis, Stephen /B-7344-2009 NR 18 TC 9 Z9 9 U1 0 U2 3 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0022-0248 J9 J CRYST GROWTH JI J. Cryst. Growth PD OCT PY 1991 VL 114 IS 1-2 BP 153 EP 185 DI 10.1016/0022-0248(91)90690-7 PG 33 WC Crystallography; Materials Science, Multidisciplinary; Physics, Applied SC Crystallography; Materials Science; Physics GA GN528 UT WOS:A1991GN52800021 ER PT J AU LOONEY, R AF LOONEY, R TI PROGRESS TOWARD DEVELOPMENT IN LATIN-AMERICA - FROM PREBISCH TO TECHNOLOGICAL AUTONOMY - DIETZ,JL, JAMES,DD SO JOURNAL OF DEVELOPING AREAS LA English DT Book Review RP LOONEY, R (reprint author), USN,POSTGRAD SCH,WASHINGTON,DC 20350, USA. NR 1 TC 0 Z9 0 U1 0 U2 0 PU WESTERN ILLINOIS UNIV PI MACOMB PA 900 WEST ADAMS ST, MACOMB, IL 61455 SN 0022-037X J9 J DEV AREAS JI J. Dev. Areas PD OCT PY 1991 VL 26 IS 1 BP 106 EP 108 PG 3 WC Area Studies; Economics; Planning & Development; Political Science SC Area Studies; Business & Economics; Public Administration; Government & Law GA GU019 UT WOS:A1991GU01900013 ER PT J AU NAHM, S SALAMANCARIBA, L JONKER, BT AF NAHM, S SALAMANCARIBA, L JONKER, BT TI STRUCTURAL STUDY OF EPITAXIAL MN/AG MULTILAYERS SO JOURNAL OF ELECTRONIC MATERIALS LA English DT Article; Proceedings Paper CT SYMP AT THE 1991 ANNUAL MEETING OF THE MINERALS, METALS AND MATERIALS SOC : STRAIN RELAXATION IN EPITAXIAL FILMS CY 1991 CL NEW ORLEANS, LA SP MINERALS MET & MAT SOC DE MULTILAYERS; TEM; MAGNETIC PROPERTIES ID MN; FILMS; SUPERLATTICES; MANGANESE; GROWTH AB We have studied the epitaxial growth and structural properties of single crystal Mn/Ag multilayers grown on (001) GaAs substrates using transmission electron microscopy. A buffer layer of Ag (001) was grown on a 5 monolayer Fe seed layer on the (001) GaAs substrate before the growth of the multilayers to obtain good quality films. Mn/Ag multilayers show very sharp and coherent interfaces for Mn layer thickness up to almost-equal-to 14 monolayers. The structure of Mn in Mn/Ag multilayers depends on the thickness of the Mn layer. An fcc precursor structure of Mn is proposed with a lattice parameter of 3.94 angstrom and is expected to be antiferromagnetic. C1 USN,RES LAB,WASHINGTON,DC 20375. RP NAHM, S (reprint author), UNIV MARYLAND,COLLEGE PK,MD 20742, USA. RI Salamanca-Riba, Lourdes/B-3785-2009 OI Salamanca-Riba, Lourdes/0000-0001-8155-6403 NR 14 TC 1 Z9 1 U1 0 U2 0 PU MINERALS METALS MATERIALS SOC PI WARRENDALE PA 420 COMMONWEALTH DR, WARRENDALE, PA 15086 SN 0361-5235 J9 J ELECTRON MATER JI J. Electron. Mater. PD OCT PY 1991 VL 20 IS 10 BP 719 EP 722 DI 10.1007/BF02665957 PG 4 WC Engineering, Electrical & Electronic; Materials Science, Multidisciplinary; Physics, Applied SC Engineering; Materials Science; Physics GA GH657 UT WOS:A1991GH65700004 ER PT J AU WU, C KIANG, RL AF WU, C KIANG, RL TI POWER PERFORMANCE OF A NONISENTROPIC BRAYTON CYCLE SO JOURNAL OF ENGINEERING FOR GAS TURBINES AND POWER-TRANSACTIONS OF THE ASME LA English DT Article ID IRREVERSIBLE HEAT ENGINES; FINITE-TIME; OPTIMAL CONFIGURATION; THERMODYNAMICS; OPTIMIZATION; EFFICIENCY; OUTPUT AB Work and power optimization of a Brayton cycle are analyzed with a finite-time heat transfer analysis. This work extends the recent flurry of publications in heat engine efficiency under the maximum power condition by incorporating nonisentropic compression and expansion. As expected, these nonisentropic processes lower the power output as well as the cycle efficiency when compared with an endoreversible Brayton cycle under the same conditions. C1 DAVID TAYLOR RES CTR,ANNAPOLIS,MD 21402. RP WU, C (reprint author), USN ACAD,DEPT MECH ENGN,ANNAPOLIS,MD 21402, USA. NR 19 TC 61 Z9 65 U1 0 U2 4 PU ASME-AMER SOC MECHANICAL ENG PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 SN 0742-4795 J9 J ENG GAS TURB POWER JI J. Eng. Gas. Turbines Power-Trans. ASME PD OCT PY 1991 VL 113 IS 4 BP 501 EP 504 DI 10.1115/1.2906268 PG 4 WC Engineering, Mechanical SC Engineering GA GM026 UT WOS:A1991GM02600005 ER PT J AU SIEFRING, CL KELLEY, MC AF SIEFRING, CL KELLEY, MC TI ANALYSIS OF STANDING WAVE PATTERNS IN VLF TRANSMITTER SIGNALS - EFFECTS OF SPORADIC-E LAYERS AND INSITU MEASUREMENTS OF LOW ELECTRON-DENSITIES SO JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS LA English DT Article ID ACTIVE THUNDERSTORM; RADIO-WAVES; IONOSPHERE; ATMOSPHERE; REFLECTION AB An analysis of standing waver patterns formed by the reflection of VLF transmitter signals incident upon a sporadic E layer is presented. The patterns were detected by electric field sensors on a sounding rocket designed to study the upward propagation of lightning-induced electric fields. To model the measured standing wave patterns, it was necessary to have an accurate electron density profile. However, it has always been difficult to make accurate measurements of the low electron densities in the nighttime D and E regions. We devise a unique method to determine the electron concentration from the measured vertical wavelength of the standing wave patterns. The data from this analysis are then used to calibrate Langmuir probe measurements which, in turn, give a reasonable (but not perfect) electron density profile to use for full-wave modeling of the transmitter signals. This analysis yields several interesting characteristics, including the possibility that some energy is trapped in the sporadic E layer. The amplitude-versus-frequency characteristics of upgoing electromagnetic waves are also modeled. It is discovered that a sporadic E layer can act as a half-wave window at appropriate frequencies. A method for using VLF signals to measure electron densities without the existence of standing wave pattern is also derived. Such a method is ideally suited for measuring the low electron densities in the nighttime D and E regions. C1 CORNELL UNIV,SCH ELECT ENGN,ITHACA,NY 14853. RP SIEFRING, CL (reprint author), USN,RES LAB,DIV PLASMA PHYS,SPACE PLASMA BRANCH,CODE 4785,WASHINGTON,DC 20375, USA. NR 34 TC 3 Z9 3 U1 0 U2 0 PU AMER GEOPHYSICAL UNION PI WASHINGTON PA 2000 FLORIDA AVE NW, WASHINGTON, DC 20009 SN 0148-0227 J9 J GEOPHYS RES JI J. Geophys. Res-Space Phys. PD OCT 1 PY 1991 VL 96 IS A10 BP 17813 EP 17826 DI 10.1029/91JA00615 PG 14 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA GJ371 UT WOS:A1991GJ37100019 ER PT J AU CHAYKOVSKY, M ADOLPH, HG AF CHAYKOVSKY, M ADOLPH, HG TI SUBSTITUENT EFFECTS IN THE CONVERSION OF AZIDO-TRINITROBENZENE AND DIAZIDOTRINITROBENZENE TO BENZOFUROXANS AND DIFUROXANS SO JOURNAL OF HETEROCYCLIC CHEMISTRY LA English DT Article AB The preparation of a number of substituted dinitrobenzofurazan oxides (dinitrobenzofuroxans) and nitrobenzobis (oxadiozoles) (nitrobenzodifuroxans), in which the substituents were amino, fluoro, formamido, hydroxy, and ureido groups, by thermolysis of azido precursors is described. The ease of thermolysis appears to be an inverse function of the angle of twist of the nitro groups ortho to the azido group from the plane of the benzene ring. Amino- and hydroxy-substituted dinitrobenzofuroxans and nitrobenzodifuroxans were found to be much more stable than their non-nitro-substituted counterparts. RP CHAYKOVSKY, M (reprint author), USN,CTR SURFACE WEAP,DIV ENERGET MAT,DAHLGREN,VA 22448, USA. NR 15 TC 14 Z9 14 U1 0 U2 0 PU HETERO CORPORATION PI TAMPA PA BOX 20285, TAMPA, FL 33622-0285 SN 0022-152X J9 J HETEROCYCLIC CHEM JI J. Heterocycl. Chem. PD OCT PY 1991 VL 28 IS 6 BP 1491 EP 1495 PG 5 WC Chemistry, Organic SC Chemistry GA HU846 UT WOS:A1991HU84600004 ER PT J AU OLIVER, JE WATERS, RM LUSBY, WR FLIPPENANDERSON, JL AF OLIVER, JE WATERS, RM LUSBY, WR FLIPPENANDERSON, JL TI A MACROCYCLIC AMIDE FROM DEHYDROCHLORINATION OF INDOLE-3-CARBONYL CHLORIDE SO JOURNAL OF HETEROCYCLIC CHEMISTRY LA English DT Article AB Indolyl-3-ketene 3 was generated from two precursors and was found to form a symmetrical tetramer 4 consisting of a sixteen-membered ring amide. The tetramer was characterized by mass spectrometry, infrared, H-1 and C-13-nmr spectroscopy, and single crystal X-ray crystallography. C1 USN,RES LAB,STRUCT MATTER LAB,WASHINGTON,DC 20375. RP OLIVER, JE (reprint author), USDA ARS,BELTSVILLE AGR RES CTR,BELTSVILLE,MD 20705, USA. NR 3 TC 5 Z9 5 U1 0 U2 0 PU HETERO CORPORATION PI TAMPA PA BOX 20285, TAMPA, FL 33622-0285 SN 0022-152X J9 J HETEROCYCLIC CHEM JI J. Heterocycl. Chem. PD OCT PY 1991 VL 28 IS 6 BP 1569 EP 1572 PG 4 WC Chemistry, Organic SC Chemistry GA HU846 UT WOS:A1991HU84600019 ER PT J AU HOEPPEL, RE HINCHEE, RE ARTHUR, MF AF HOEPPEL, RE HINCHEE, RE ARTHUR, MF TI BIOVENTING SOILS CONTAMINATED WITH PETROLEUM-HYDROCARBONS SO JOURNAL OF INDUSTRIAL MICROBIOLOGY LA English DT Review DE SOIL VENTING; BIOREMEDIATION; SOIL VOLATILIZATION; JET FUEL; DIESEL; HYDROCARBONS; PETROLEUM ID MICROBIAL-DEGRADATION; BIODEGRADATION; CULTURES AB Bioventing combines the capabilities of soil venting and enhanced bioremediation to cost-effectively remove light and middle distillate hydrocarbons from vadose zone soils and the groundwater table. Soil venting removes the more volatile fuel components from unsaturated soil and promotes aerobic biodegradation by driving large volumes of air into the subsurface. In theory, air is several thousand times more effective than water in penetrating and aerating fuel-saturated and low permeability soil horizons. Aerobic microbial degradation can mitigate both residual and vapor phase hydrocarbon concentrations. Soil venting is being evaluated at a number of U.S. military sites contaminated with middle distillate fuels to determine its potential to stimulate in situ aerobic biodegradation and to develop techniques to promote in situ vapor phase degradation. In situ respirometric evaluations and field pilot studies at sites with varying soil conditions indicate that bioventing is a cost-effective method to treat soils contaminated with jet fuels and diesel. C1 BATTELLE MEM INST,COLUMBUS,OH 43201. RP HOEPPEL, RE (reprint author), USN,CIVIL ENGN LAB,CODE L71,PORT HUENEME,CA 93043, USA. NR 48 TC 40 Z9 43 U1 3 U2 11 PU STOCKTON PRESS PI BASINGSTOKE PA HOUNDMILLS, BASINGSTOKE, HAMPSHIRE, ENGLAND RG21 6XS SN 0169-4146 J9 J IND MICROBIOL JI J. Indust. Microbiol. PD OCT PY 1991 VL 8 IS 3 BP 141 EP 146 DI 10.1007/BF01575846 PG 6 WC Biotechnology & Applied Microbiology SC Biotechnology & Applied Microbiology GA GM563 UT WOS:A1991GM56300001 ER PT J AU WEIMER, WA CERIO, FM JOHNSON, CE AF WEIMER, WA CERIO, FM JOHNSON, CE TI EXAMINATION OF THE CHEMISTRY INVOLVED IN MICROWAVE PLASMA ASSISTED CHEMICAL VAPOR-DEPOSITION OF DIAMOND SO JOURNAL OF MATERIALS RESEARCH LA English DT Article ID EPITAXIAL-GROWTH; METHANE HYDROGEN; LOW-PRESSURE; FILM GROWTH; OXYGEN; MECHANISM; ACETYLENE; CVD; METHYL; TEMPERATURE AB Chemical reaction products formed in a microwave plasma assisted chemical vapor deposition apparatus for diamond film deposition are detected using mass spectrometry. Carbon source gases CH4, C2H6, C2H4, or C2H2 produce CH4, C2H2, CO, and H2O as major stable reaction products when introduced into a H2/O2 plasma under diamond deposition conditions. The effect of oxygen addition is similar for all carbon source gases with respect to reaction product formation, indicating that a common reaction mechanism is active in all cases. On a qualitative basis, these observations are consistent with a mechanism describing the oxidation of CH4 in flames. No beneficial effects were observed using alternating growth/etch cycles to deposit films. Films grown using CH4 as the carbon source gas consistently produce higher quality diamond films compared to films grown from C2H2. RP WEIMER, WA (reprint author), USN,CTR WEAP,RES DEPT,DIV CHEM,CHINA LAKE,CA 93555, USA. NR 39 TC 49 Z9 50 U1 0 U2 4 PU MATERIALS RESEARCH SOCIETY PI PITTSBURGH PA 9800 MC KNIGHT ROAD SUITE 327, PITTSBURGH, PA 15237 SN 0884-2914 J9 J MATER RES JI J. Mater. Res. PD OCT PY 1991 VL 6 IS 10 BP 2134 EP 2144 DI 10.1557/JMR.1991.2134 PG 11 WC Materials Science, Multidisciplinary SC Materials Science GA GJ509 UT WOS:A1991GJ50900017 ER PT J AU SAENZ, AW AF SAENZ, AW TI HIGHER-ORDER AVERAGING FOR NONPERIODIC SYSTEMS SO JOURNAL OF MATHEMATICAL PHYSICS LA English DT Article AB In this paper, a recently developed improved averaging method for periodic nonlinear systems of ordinary differential equations (ODEs) is extended to a wide class of nonperiodic ODE systems of nonlinear type. The paper presents the first systematic treatment of Nth-order averaging for nonperiodic systems of the present degree of generality. Our main results are: (i) a basic existence, uniqueness, and approximation theorem for Nth-order averaging for the latter systems, including explicit, rigorous error bounds expressed in terms of suitable order functions; (ii) a proof that our (N + 1)st error estimate is smaller (o(1)) than the corresponding Nth-order estimate when the relevant perturbation parameter-epsilon is sufficiently small (this is not obvious, since our error bounds are not generally proportional to powers of epsilon); (iii) a proof that (ii) holds when the exact order functions are replaced by appropriate upper bounds which are simpler to calculate in practice. For the example of a linear oscillator with time-dependent friction, it is shown that our second-order averaging estimates are generally better than those given by the approach of Sanders and Verhulst. Nth-order averaging for a large class of C infinity quasiperiodic systems is also discussed, generalizing earlier work of Perko. C1 CATHOLIC UNIV,WASHINGTON,DC 20064. RP SAENZ, AW (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 15 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 0022-2488 J9 J MATH PHYS JI J. Math. Phys. PD OCT PY 1991 VL 32 IS 10 BP 2679 EP 2694 PG 16 WC Physics, Mathematical SC Physics GA GJ154 UT WOS:A1991GJ15400010 ER PT J AU STENGERSMITH, JD FISCHER, JW HENRY, RA HOOVER, JM NADLER, MP NISSAN, RA LINDSAY, GA AF STENGERSMITH, JD FISCHER, JW HENRY, RA HOOVER, JM NADLER, MP NISSAN, RA LINDSAY, GA TI POLY[(4-N-ETHYLENE-N-ETHYLAMINO)-ALPHA-CYANOCINNAMATE] - A NONLINEAR OPTICAL POLYMER WITH A CHROMOPHORIC MAINCHAIN .1. SYNTHESIS AND SPECTRAL CHARACTERIZATION SO JOURNAL OF POLYMER SCIENCE PART A-POLYMER CHEMISTRY LA English DT Article ID CHAIN AB Poly[(4-N-ethylene-N-ethylamino)-alpha-cyanocinnamate] was prepared by solution esterification of (4-N-ethyl-N-(2-hydroxyethyl)amino)-alpha-cyanocinnamic acid and by melt transesterification of ethyl (4-N-ethyl-N-(2-hydroxyethyl)amino)-alpha-cyanocinnamate. The melt transesterification generally yielded polymer with a number-average molecular weight of about 10,200 by gel permeation chromatography (GPC) versus polystyrene standards. The polymer was found to be amorphous with a glass transition temperature of about 103-degrees-C by differential scanning calorimetry (DSC). The solution esterification generally gave a polymer with a number-average molecular weight of about 2200 by GPC versus polystyrene standards. This polymer was found to have a glass transition temperature varying between 60 and 90-degrees-C by DSC. The infrared (IR) spectrum of the polymer made from both methods were analyzed in detail. The H-1- and C-13-NMR spectra of the melt-synthesized ethyl cinnamate derivative polymer are consistent with the reported structure. RP STENGERSMITH, JD (reprint author), USN,CTR WEAP,DIV CHEM,CHINA LAKE,CA 93555, USA. NR 19 TC 42 Z9 42 U1 0 U2 2 PU JOHN WILEY & SONS INC PI NEW YORK PA 605 THIRD AVE, NEW YORK, NY 10158-0012 SN 0887-624X J9 J POLYM SCI POL CHEM JI J. Polym. Sci. Pol. Chem. PD OCT PY 1991 VL 29 IS 11 BP 1623 EP 1631 DI 10.1002/pola.1991.080291112 PG 9 WC Polymer Science SC Polymer Science GA GF543 UT WOS:A1991GF54300012 ER PT J AU KILROY, WP SCHLAIKJER, C YETMAN, R ALAMGIR, M ABRAHAM, KM AF KILROY, WP SCHLAIKJER, C YETMAN, R ALAMGIR, M ABRAHAM, KM TI LITHIUM BATTERIES UTILIZING SOCL2-SO2CL2 MIXED ELECTROLYTES SO JOURNAL OF POWER SOURCES LA English DT Article AB The performance of C-size commercial cells containing mixtures of SOCl2-SO2Cl2 mixed depolarizers with 1.0 and 1.8 M LiAlCl4 has been compared with that of Li/SOCl2 cells as a function of discharge temperature. Fresh cells as well as those stored at 70-degrees-C were discharged at constant resistive loads equivalent to 1 and 10 mA/cm2 at 2 5, 0 and -30-degrees-C. Cell capacity, voltage regulation and start-up characteristics were found to depend on storage, SOCl2/SO2Cl2 ratio and LiAlCl4 concentration. The mixed depolarizer cells had superior performance at the lower discharge temperatures and after storage. The behavior of metal phthalocyanine catalysts was evaluated in 1.8 M LiAlCl4 60/40 SO2Cl2/SOCl2 electrolyte at 10 mA/cm2 at 25-degrees-C after storage at 70-degrees-C. The NiPc and CuPc catalysts improved overall cell performance. C1 BATTERY ENGN INC,HYDE PK,MA 02136. EIC LABS INC,NORWOOD,MA 02062. RP KILROY, WP (reprint author), USN,CTR SURFACE WARFARE,SILVER SPRING,MD 20903, USA. NR 9 TC 1 Z9 2 U1 1 U2 2 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 OCT PY 1991 VL 36 IS 1 BP 1 EP 10 DI 10.1016/0378-7753(91)80039-Z PG 10 WC Chemistry, Physical; Electrochemistry; Energy & Fuels; Materials Science, Multidisciplinary SC Chemistry; Electrochemistry; Energy & Fuels; Materials Science GA GE148 UT WOS:A1991GE14800002 ER PT J AU GARY, JJ MITCHELL, DL STEIFEL, SM HALE, ML AF GARY, JJ MITCHELL, DL STEIFEL, SM HALE, ML TI TISSUE COMPATIBILITY OF METHYLMETHACRYLATE IN CRANIAL PROSTHESES - A PRELIMINARY INVESTIGATION SO JOURNAL OF PROSTHETIC DENTISTRY LA English DT Article ID CRANIOPLASTY AB An in vivo study using 48 disease-free male Lewis rats was conducted to determine the histologic difference between an alloplastic cranial prosthesis made with a monomer directly from the manufacturer and a triple-distilled monomer. The histologic difference in the tissue reaction between a cranial prosthesis sterilized with ethylene oxide and one sterilized with cobalt-60 irradiation was also evaluated. Histologic tissue biopsies of the cranium and brain tissues were obtained at 1, 3, 6, and 12 weeks. Tissue biopsies after the third week showed minimal inflammation and the microscopic findings were consistent with the reparative stage of wound healing. The findings also suggest that distillation of the monomer in heat-polymerized methyl-methacrylate is unnecessary for cranial prostheses. Cobalt-60 irradiation was found to be an effective alternative method of sterilization for such prostheses. C1 USN,SCH DENT,NATL NAVAL DENT CTR,DEPT PROSTHODONT,DIV MAXILLOFACIAL PROSTHET,BETHESDA,MD 20814. ARMED FORCES RADIOBIOL RES INST,DEPT VET MED,DIV COMPARAT PATHOL,BETHESDA,MD 20814. ARMED FORCES RADIOBIOL RES INST,DEPT BIOCHEM,BETHESDA,MD 20814. NR 21 TC 5 Z9 5 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 OCT PY 1991 VL 66 IS 4 BP 530 EP 536 DI 10.1016/0022-3913(91)90518-2 PG 7 WC Dentistry, Oral Surgery & Medicine SC Dentistry, Oral Surgery & Medicine GA GH713 UT WOS:A1991GH71300021 PM 1791566 ER PT J AU EDELSON, GS SULLIVAN, EJ AF EDELSON, GS SULLIVAN, EJ TI ON THE PERFORMANCE OF THE OVERLAP-CORRELATOR SYNTHETIC-APERTURE TECHNIQUE SO JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA LA English DT Article ID TOWED ARRAY AB The overlap-correlator technique of passive synthetic-aperture array processing [S. Stergiopoulos and E. J. Sullivan, J. Acoust. Soc. Am. 86, 158-171 (1989)] is investigated. This method of providing an effective aperture greater than that of the physical array utilizes phase correction factors that are calculated by correlating overlapping space samples of the acoustic signal from successive measurements of the moving towed array. Given the criterion of minimizing the effect of the signal-to-noise ratio (SNR) on the phase correction factor error while achieving a fixed effective aperture length, the optimal overlap in number of hydrophones between these two successive measurements is derived. The conditions under which the calculated phase correction factor is equivalent to that of the desired phase correction factor are also studied. C1 USN,CTR UNDERWATER SYST,NEWPORT,RI 02841. RP EDELSON, GS (reprint author), UNIV RHODE ISL,DEPT ELECT ENGN,KINGSTON,RI 02881, USA. NR 5 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 OCT PY 1991 VL 90 IS 4 BP 2000 EP 2003 DI 10.1121/1.401627 PN 1 PG 4 WC Acoustics; Audiology & Speech-Language Pathology SC Acoustics; Audiology & Speech-Language Pathology GA GJ147 UT WOS:A1991GJ14700030 ER PT J AU NUTTALL, AH WILSON, JH AF NUTTALL, AH WILSON, JH TI ESTIMATION OF THE ACOUSTIC FIELD DIRECTIONALITY BY USE OF PLANAR AND VOLUMETRIC ARRAYS VIA THE FOURIER-SERIES METHOD AND THE FOURIER INTEGRAL METHOD SO JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA LA English DT Article AB The possibility of estimating the directionality of a stationary homogeneous noise field, directly from the element outputs of a line array, is investigated and found to be feasible for large arrays without encountering ill conditioning. This technique, called inverse beamforming for historical reasons, is applicable to line and planar as well as volumetric arrays, and requires no more than two-dimensional fast Fourier transforms (FFTs) for its realization. Derivations and results are presented both for a Fourier series method and a Fourier integral method. C1 NEPTUNE TECHNOL INC,SAN CLEMENTE,CA 92672. RP NUTTALL, AH (reprint author), USN,CTR UNDERWATER SYST,CODE 304,NEW LONDON,CT 06320, USA. NR 15 TC 9 Z9 16 U1 2 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 OCT PY 1991 VL 90 IS 4 BP 2004 EP 2019 DI 10.1121/1.401628 PN 1 PG 16 WC Acoustics; Audiology & Speech-Language Pathology SC Acoustics; Audiology & Speech-Language Pathology GA GJ147 UT WOS:A1991GJ14700031 ER PT J AU ZAYKOSKI, J TALMY, I NORR, M AF ZAYKOSKI, J TALMY, I NORR, M TI DESILICONIZATION OF MULLITE FELT SO JOURNAL OF THE AMERICAN CERAMIC SOCIETY LA English DT Article AB High-temperature evaporation from 80% porous, rigid mullite (3Al2O3.2SiO2) whisker felt was studied under vacuum and at various helium pressures using gravimetry, X-ray diffractometry, SEM, and EDS. Heat treatments at 1350-degrees to 1550-degrees-C resulted in evaporation of SiO2 from mullite with a rate strongly dependent on temperature and pressure. A concentration gradient of SiO2 was observed through the cross section of samples after heating under vacuum, indicating that SiO2 preferentially evaporated from whiskers on the periphery of the samples. The SiO2 concentration gradient was accompanied by sharp microstructural changes across the specimens. The gradient was decreased by raising the ambient helium pressure during heat treatment. A mathematical model was developed to predict the SiO2 concentration profile. The model agrees well with experimental results and demonstrates that the diffusivity of SiO2 in the vapor phase controls the gradient of SiO2 through the cross section of mullite felt. C1 UNIV MARYLAND,COLL ENGN,COLLEGE PK,MD 20742. RP ZAYKOSKI, J (reprint author), NAVAL SURFACE WARFARE CTR,SILVER SPRING,MD 20904, USA. NR 11 TC 10 Z9 10 U1 0 U2 0 PU AMER CERAMIC SOC PI WESTERVILLE PA 735 CERAMIC PLACE, PO BOX 6136, WESTERVILLE, OH 43081-6136 SN 0002-7820 J9 J AM CERAM SOC JI J. Am. Ceram. Soc. PD OCT PY 1991 VL 74 IS 10 BP 2419 EP 2427 DI 10.1111/j.1151-2916.1991.tb06779.x PG 9 WC Materials Science, Ceramics SC Materials Science GA GM652 UT WOS:A1991GM65200013 ER PT J AU HARLEY, EH AF HARLEY, EH TI SINUS HISTIOCYTOSIS WITH MASSIVE LYMPHADENOPATHY (ROSAI-DORFMAN DISEASE) IN A PATIENT WITH ELEVATED EPSTEIN-BARR-VIRUS TITERS SO JOURNAL OF THE NATIONAL MEDICAL ASSOCIATION LA English DT Article DE SINUS HISTIOCYTOSIS; LYMPHADENOPATHY; ADENOPATHY; CYCLOPHOSPHAMIDE AB Sinus histiocytosis with massive lymphadenopathy (SHML) is a newly recognized disorder. The etiology of this disease is unknown. An exaggerated response to an offending agent such as the Epstein-Barr virus or Klebsiella bacteria has been postulated. Its course is usually benign. Cervical adenopathy is seen in 97% of the patients, while 30% of patients have nodal involvement in other sites, and 30% have extranodal involvement. There is a 7% mortality rate that occurs primarily in patients with immunologic defects. Corticosteroids ameliorate the constitutional symptoms, but cyclophosphamide appears to have the most beneficial effect. This article presents the case of a patient with SHML who demonstrated elevated Epstein-Barr virus titers. C1 USN HOSP,DEPT OTOLARYNGOL,SAN DIEGO,CA 92134. RP HARLEY, EH (reprint author), USN HOSP,DEPT CLIN INVEST,SAN DIEGO,CA 92134, USA. NR 0 TC 16 Z9 16 U1 0 U2 0 PU SLACK INC PI THOROFARE PA 6900 GROVE RD, THOROFARE, NJ 08086 SN 0027-9684 J9 J NATL MED ASSOC JI J. Natl. Med. Assoc. PD OCT PY 1991 VL 83 IS 10 BP 922 EP 924 PG 3 WC Medicine, General & Internal SC General & Internal Medicine GA GJ646 UT WOS:A1991GJ64600015 PM 1666127 ER PT J AU SHREEVE, RP ELAZAR, Y DREON, JW BAYDAR, A AF SHREEVE, RP ELAZAR, Y DREON, JW BAYDAR, A TI WAKE MEASUREMENTS AND LOSS EVALUATION IN A CONTROLLED DIFFUSION COMPRESSOR CASCADE SO JOURNAL OF TURBOMACHINERY-TRANSACTIONS OF THE ASME LA English DT Article; Proceedings Paper CT 35TH INTERNATIONAL GAS TURBINE AND AEROENGINE CONGRESS AND EXPOSITION CY JUN 11-14, 1990 CL BRUSSELS, BELGIUM ID BOUNDARY-LAYERS; PERFORMANCE; DESIGN; BLADE; FLOW AB The results of two component laser-Doppler velocimeter (LDV) surveys made in the near wake (to one fifth chord) of a controlled diffusion (CD) compressor blade in a large-scale cascade wind tunnel are reported. The measurements were made at three positive incidence angles from near design to angles thought to approach stall. Comparisons were made with calibrated pressure probe and hot-wire wake measurements and good agreement was found. The flow was found to be fully attached at the trailing edge at all incidence angles and the wake profiles were found to be highly skewed. Despite the precision obtained in the wake velocity profiles, the blade loss could not be evaluated accurately without measurements of the pressure field. The blade trailing edge surface pressures and velocity profiles were found to be consistent with downstream pressure probe measurements of loss, allowing conclusions to be drawn concerning the design of the trailing edge. C1 USN,NAVAL POSTGRAD SCH,TURBOPROP LAB,MONTEREY,CA 93943. NR 22 TC 8 Z9 8 U1 0 U2 1 PU ASME-AMER SOC MECHANICAL ENG PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 SN 0889-504X J9 J TURBOMACH JI J. Turbomach.-Trans. ASME PD OCT PY 1991 VL 113 IS 4 BP 591 EP 599 DI 10.1115/1.2929120 PG 9 WC Engineering, Mechanical SC Engineering GA HP741 UT WOS:A1991HP74100007 ER PT J AU JANG, HM EKATERINARIS, JA PLATZER, MF CEBECI, T AF JANG, HM EKATERINARIS, JA PLATZER, MF CEBECI, T TI ESSENTIAL INGREDIENTS FOR THE COMPUTATION OF STEADY AND UNSTEADY BLADE BOUNDARY-LAYERS SO JOURNAL OF TURBOMACHINERY-TRANSACTIONS OF THE ASME LA English DT Article; Proceedings Paper CT 35TH INTERNATIONAL GAS TURBINE AND AEROENGINE CONGRESS AND EXPOSITION CY JUN 11-14, 1990 CL BRUSSELS, BELGIUM ID EQUATIONS AB Two methods are described for calculating pressure distributions and boundary layers on blades subjected to low Reynolds numbers and ramp-type motion. The first is based on an interactive scheme in which the inviscid flow is computed by a panel method and the boundary layer flow by an inverse method that makes use of the Hilbert integral to couple the solutions of the inviscid and viscous flow equations. The second method is based on the solution of the compressible Navier-Stokes equations with an embedded grid technique that permits accurate calculation of boundary layer flows. Studies for the Eppler-387 and NACA-0012 airfoils indicate that both methods can be used to calculate the behavior of unsteady blade boundary layers at low Reynolds numbers provided that the location of transition is computed with the e(n) method and the transitional region is modeled properly. C1 UNIV MICHIGAN,DEPT MECH ENGN,ANN ARBOR,MI 48109. NAVY,NASA,JOINT INST AERONAUT,MONTEREY,CA 93943. USN,NAVAL POSTGRAD SCH,DEPT AERONAUT & ASTRONAUT,MONTEREY,CA 93943. CALIF STATE UNIV LONG BEACH,DEPT AEROSP ENGN,LONG BEACH,CA 90840. NR 23 TC 1 Z9 1 U1 0 U2 0 PU ASME-AMER SOC MECHANICAL ENG PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 SN 0889-504X J9 J TURBOMACH JI J. Turbomach.-Trans. ASME PD OCT PY 1991 VL 113 IS 4 BP 608 EP 616 DI 10.1115/1.2929124 PG 9 WC Engineering, Mechanical SC Engineering GA HP741 UT WOS:A1991HP74100009 ER PT J AU OLEARY, MJ SHELTON, C GIDDINGS, NA KWARTLER, J BRACKMANN, DE AF OLEARY, MJ SHELTON, C GIDDINGS, NA KWARTLER, J BRACKMANN, DE TI GLOMUS TYMPANICUM TUMORS - A CLINICAL PERSPECTIVE SO LARYNGOSCOPE LA English DT Article ID CHEMODECTOMAS; RADIOTHERAPY; JUGULARE AB Since Guild first discovered glomus bodies in the middle ear, the diagnostic evaluation and therapy of glomus tympanicum tumors have remained challenging. This study describes 73 cases diagnosed as glomus tympanicum tumors over the past 30 years. During this period, imaging techniques have markedly improved, and surgical approaches have evolved and been refined. These 73 cases were reviewed from a clinical perspective involving presentation, diagnostic evaluation, and therapeutic management. Pulsatile tinnitus was the primary symptom in over half the patients, followed by hearing loss in one third. The physical exam rarely revealed a circumferential view of the lesion, emphasizing the necessity of further diagnostic evaluation. High-resolution computerized tomography (CT) is currently the radiographic study of choice. A transmastoid surgical approach with extended facial recess was most commonly employed. Extension to the jugular bulb or internal carotid was rare, and no intraoperative complications of catecholamine secretion were noted. Postoperative complications were few, and the overall residual/recurrence rate was less than 5%. Additional clinical insights may assist in the management of these rare but fascinating tumors. C1 UNIV SO CALIF,SCH MED,HOUSE EAR CLIN,LOS ANGELES,CA 90033. UNIV SO CALIF,SCH MED,HOUSE EAR INST,LOS ANGELES,CA 90033. USN,MED CORPS,DANVILLE,PA. GEISINGER MED CTR,DANVILLE,PA 17822. UNIV MED & DENT NEW JERSEY,NEW JERSEY MED SCH,NEWARK,NJ 07103. RP SHELTON, C (reprint author), 2100 W 3RD ST,LOS ANGELES,CA 90057, USA. NR 19 TC 53 Z9 56 U1 0 U2 4 PU LARYNGOSCOPE CO PI ST LOUIS PA 10 S BROADWAY 14TH FLOOR, ST LOUIS, MO 63102-1741 SN 0023-852X J9 LARYNGOSCOPE JI Laryngoscope PD OCT PY 1991 VL 101 IS 10 BP 1038 EP 1043 PG 6 WC Medicine, Research & Experimental; Otorhinolaryngology SC Research & Experimental Medicine; Otorhinolaryngology GA GU814 UT WOS:A1991GU81400002 PM 1656153 ER PT J AU NACIRI, J PFEIFFER, S SHASHIDHAR, R AF NACIRI, J PFEIFFER, S SHASHIDHAR, R TI FAST SWITCHING FERROELECTRIC SIDE-CHAIN LIQUID-CRYSTALLINE POLYMER AND COPOLYMER SO LIQUID CRYSTALS LA English DT Note ID SPONTANEOUS POLARIZATION AB New ferroelectric side-chain liquid-crystalline polymers, a copolymer and a homopolymer, with siloxane backbone and a triaromatic mesogen as the side group have been synthesized. The materials exhibit a chiral smectic C phase over a large temperature range extending to room temperature. They possess high values of spontaneous polarization: 105 nC cm-2 for the homopolymer and 180 nC cm-2 for the copolymer. The electro-optic switching time in the chiral smectic C phase is extremely fast (150-mu-s). In the smectic A phase, an electroclinic effect with switching times less than 100-mu-s and with field induced tilt angles of 18-degrees is observed. C1 USN,RES LAB,CTR BIOMOLEC SCI & ENGN,CODE 6090,WASHINGTON,DC 20375. GEORGETOWN UNIV,DEPT CHEM,WASHINGTON,DC 20057. GEOCENTERS INC,FT WASHINGTON,MD 20744. NR 17 TC 49 Z9 49 U1 0 U2 0 PU TAYLOR & FRANCIS LTD PI LONDON PA ONE GUNDPOWDER SQUARE, LONDON, ENGLAND EC4A 3DE SN 0267-8292 J9 LIQ CRYST JI Liq. Cryst. PD OCT PY 1991 VL 10 IS 4 BP 585 EP 591 DI 10.1080/02678299108036446 PG 7 WC Chemistry, Multidisciplinary; Crystallography; Materials Science, Multidisciplinary SC Chemistry; Crystallography; Materials Science GA GE751 UT WOS:A1991GE75100013 ER PT J AU HAUGHT, D TALMY, I DIVECHA, D KARMARKAR, S AF HAUGHT, D TALMY, I DIVECHA, D KARMARKAR, S TI MULLITE WHISKER FELT AND ITS APPLICATION IN COMPOSITES SO MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING LA English DT Article; Proceedings Paper CT SYMP OF THE AMERICAN SOC OF METALS INTERNATIONAL MATERIALS WEEK : INNOVATIVE INORGANIC COMPOSITES CY OCT 08-11, 1990 CL DETROIT, MI SP AMER SOC METALS AB The Naval Surface Warfare Center has developed a process for the in situ preparation of 80% porous mullite whisker felt which consists of randomly oriented whiskers mutually intergrown, forming a rigid structure. The felt can be used as pre-forms for the preparation of metal and ceramic matrix composites. The patented process involves mixing and shaping the powdered precursors followed by firing to form in situ the mullite whisker felt. The powders can be shaped by any conventional process. An advantage of the process is the elimination of health hazards associated with loose respirable whiskers. The low dimensional changes of the final felt compared with the green shapes are a valuable feature for the preparation of near-net shape composite preforms. Methods for infiltration of the felt with cast aluminum alloy A356 and properties of the composites will be discussed. RP HAUGHT, D (reprint author), USN,CTR SURFACE WARFARE,SILVER SPRING,MD 20903, USA. NR 7 TC 8 Z9 8 U1 0 U2 4 PU ELSEVIER SCIENCE SA LAUSANNE PI LAUSANNE 1 PA PO BOX 564, 1001 LAUSANNE 1, SWITZERLAND SN 0921-5093 J9 MAT SCI ENG A-STRUCT JI Mater. Sci. Eng. A-Struct. Mater. Prop. Microstruct. Process. PD OCT 1 PY 1991 VL 144 BP 207 EP 214 DI 10.1016/0921-5093(91)90226-D PG 8 WC Nanoscience & Nanotechnology; Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Science & Technology - Other Topics; Materials Science; Metallurgy & Metallurgical Engineering GA GN778 UT WOS:A1991GN77800024 ER PT J AU FISHMAN, SG ABBASCHIAN, R CORNIE, JA AF FISHMAN, SG ABBASCHIAN, R CORNIE, JA TI STRUCTURAL-MATERIALS - PROPERTIES, MICROSTRUCTURE AND PROCESSING - PREFACE SO MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING LA English DT Editorial Material C1 UNIV FLORIDA,GAINESVILLE,FL 32611. MIT,CAMBRIDGE,MA 02139. RP FISHMAN, SG (reprint author), OFF NAVAL RES,ARLINGTON,VA 22217, USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU ELSEVIER SCIENCE SA LAUSANNE PI LAUSANNE 1 PA PO BOX 564, 1001 LAUSANNE 1, SWITZERLAND SN 0921-5093 J9 MAT SCI ENG A-STRUCT JI Mater. Sci. Eng. A-Struct. Mater. Prop. Microstruct. Process. PD OCT 1 PY 1991 VL 144 BP R5 EP R5 DI 10.1016/0921-5093(91)90203-Y PG 1 WC Nanoscience & Nanotechnology; Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Science & Technology - Other Topics; Materials Science; Metallurgy & Metallurgical Engineering GA GN778 UT WOS:A1991GN77800001 ER PT J AU MITCHELL, PB MACGILLIVRAY, DC ALMOND, MD AF MITCHELL, PB MACGILLIVRAY, DC ALMOND, MD TI EFFORT THROMBOSIS - RECOGNITION AND MANAGEMENT WHILE UNDERWAY SO MILITARY MEDICINE LA English DT Article AB Effort thrombosis of the axillary and subclavian veins is an uncommon cause of upper extremity swelling. Prompt recognition and treatment of this disorder is important in order to minimize the complications of pulmonary embolism and post-phlebitic syndrome that can occur with this condition. This can be very challenging while underway or in the field. A sailor who developed effort vein thrombosis while underway on board the aircraft carrier USS Abraham Lincoln is presented to review the presentation and management of this disorder, particularly as it applies to active duty military personnel. RP MITCHELL, PB (reprint author), USN,DEPT MED,USS ABRAHAM LINCOLN CVN 72,FPO,SAN FRANCISCO,CA 96612, USA. NR 0 TC 5 Z9 5 U1 1 U2 1 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 OCT PY 1991 VL 156 IS 10 BP 561 EP 563 PG 3 WC Medicine, General & Internal SC General & Internal Medicine GA GK669 UT WOS:A1991GK66900023 PM 1749504 ER PT J AU VOGE, VM AF VOGE, VM TI SIMULATOR SICKNESS PROVOKED BY A HUMAN CENTRIFUGE SO MILITARY MEDICINE LA English DT Article AB Simulator sickness is now a well-recognized entity. It is recognized as a form of motion sickness, having a higher incidence in the more sophisticated simulators. Human centrifuges (dynamic simulators) are the newest innovation in aircrew training devices. Simulator sickness has never been reported in human centrifuges. We are reporting on a case of delayed simulator sickness in a pilot-subject after a centrifuge experience. A review of the "psycho-physiological" problems routinely experienced by subjects on human centrifuges indicates such problems are due to simulator sickness, although they are not reported as such. In this paper, we give a brief overview of simulator sickness and briefly discuss simulator sickness, as related to the human centrifuge experience. RP VOGE, VM (reprint author), USN,CTR AIR DEV,CODE 09,WARMINSTER,PA 18974, 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 OCT PY 1991 VL 156 IS 10 BP 575 EP 577 PG 3 WC Medicine, General & Internal SC General & Internal Medicine GA GK669 UT WOS:A1991GK66900026 PM 1749507 ER PT J AU SKUPNIEWICZ, CE GLENDENING, JW KAMADA, RF AF SKUPNIEWICZ, CE GLENDENING, JW KAMADA, RF TI BOUNDARY-LAYER-TRANSITION ACROSS A STRATOCUMULUS CLOUD EDGE IN A COASTAL ZONE SO MONTHLY WEATHER REVIEW LA English DT Article ID SONIC ANEMOMETER; TURBULENCE; HEIGHT; MODEL AB We examine the lateral transition from a stratocumulus-covered boundary layer to a clear-sky convective boundary layer during onshore flow in a coastal environment, using both mobile sodar observations and a numerical model. During four observation periods, the vertically averaged wind speed increases by roughly a factor of 2 within 5 km of the cloud edge, and the boundary-layer-averaged wind direction backs 40-degrees-60-degrees. The numerical predictions, driven by horizontal heat flux differences between cloudy- and clear-sky regions, agree quantitatively with both the observed wind speedup near the cloud edge and the observed boundary-layer growth, but the wind direction backing is underpredicted. In both observations and predictions, the surface wind speed maximum moves inland with time, whereas the boundary-layer-averaged wind speed maximum remains at the cloud edge. At the cloud edge, a predicted subsidence maximum coincides with an observed dip in boundary-layer depth. In the clear-sky region, concomitant rising motion-not entrainment-is primarily responsible for the rapid boundary-layer growth with distance. An energy balance approach, which neglects this upward motion, greatly underpredicts boundary-layer growth. The solar indicates regions of strong wind shear under the clouds, but shear of that magnitude is not predicted by the model. Significant wind and boundary-layer changes, primarily due to baroclinicity induced by cloud shading, occur at the quasi-stationary stratocumulus cloud edge; these changes, which we term a cloud breeze, can transcend the influence of the land-water interface in coastal regions. RP SKUPNIEWICZ, CE (reprint author), USN,POSTGRAD SCH,DEPT PHYS,CODE PH,MONTEREY,CA 93943, USA. NR 23 TC 6 Z9 6 U1 0 U2 1 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 OCT PY 1991 VL 119 IS 10 BP 2337 EP 2357 DI 10.1175/1520-0493(1991)119<2337:BLTAAS>2.0.CO;2 PG 21 WC Meteorology & Atmospheric Sciences SC Meteorology & Atmospheric Sciences GA GL879 UT WOS:A1991GL87900001 ER PT J AU PILNICK, SE GLAZEBROOK, KD GAVER, DP AF PILNICK, SE GLAZEBROOK, KD GAVER, DP TI OPTIMAL SEQUENTIAL REPLENISHMENT OF SHIPS DURING COMBAT SO NAVAL RESEARCH LOGISTICS LA English DT Article ID STOCHASTIC SCHEDULING PROBLEMS; MACHINE BREAKDOWNS; BANDIT PROCESSES; STRATEGIES; ALLOCATION; MODELS AB A carrier battle group is operating in an area where it is subject to attack by enemy aircraft. It is anticipated that air raids will occur in large waves. The uncertain time between raids is available for the replenishment of supplies. We consider the problem of how best to schedule ammunition replenishment during this period. The theory of Gittins indices provides the technical background to the development of a range of models which yield a hierarchy of index-based heuristics for replenishment. One such heuristic is assessed computationally in a more realistic scenario than is explicitly allowed for by the models. C1 UNIV NEWCASTLE UPON TYNE,DEPT MATH & STAT,NEWCASTLE TYNE NE1 7RU,TYNE & WEAR,ENGLAND. USN,POSTGRAD SCH,MONTEREY,CA 93943. RP PILNICK, SE (reprint author), USN,WASHINGTON,DC 20350, USA. NR 23 TC 2 Z9 2 U1 0 U2 1 PU JOHN WILEY & SONS INC PI NEW YORK PA 605 THIRD AVE, NEW YORK, NY 10158-0012 SN 0894-069X J9 NAV RES LOG JI Nav. Res. Logist. PD OCT PY 1991 VL 38 IS 5 BP 637 EP 668 DI 10.1002/1520-6750(199110)38:5<637::AID-NAV3220380502>3.0.CO;2-B PG 32 WC Operations Research & Management Science SC Operations Research & Management Science GA GF936 UT WOS:A1991GF93600001 ER PT J AU GRISCOM, DL AF GRISCOM, DL TI OPTICAL-PROPERTIES AND STRUCTURE OF DEFECTS IN SILICA GLASS SO NIPPON SERAMIKKUSU KYOKAI GAKUJUTSU RONBUNSHI-JOURNAL OF THE CERAMIC SOCIETY OF JAPAN LA English DT Article DE SILICA GLASS; OPTICAL PROPERTIES; STRUCTURE; RADIATION DAMAGE; POINT DEFECTS; ELECTRON SPIN RESONANCE AB This paper reviews what is known about the structures and optical properties of point defects in silica glass and other amorphous forms of SiO2. The available structural information derives mainly from the results of electron spin resonance (ESR) spectrometry-a method which is directly applicable only to the sub-class of defects which are paramagnetic. The intrinsic paramagnetic centers so far identified by ESR include E' centers (= Si .), nonbridging-oxygen hole centers (= Si-O .), peroxy radicals (= Si-O-O .), and self-trapped holes. Examples of intrinsic diamagnetic defects believed to occur in silica in include neutral oxygen vacancies (= Si-Si =), two-coordinated silicons (-O-Si-O-), and peroxy linkages (= Si-O-O-Si =). The most common extrinsic defects are associated with hydroxyl and chloride impurities. Radiolytically induced H-0 and H-2 play important roles in the post-irradiation growth and decay kinetics of defects in glasses containing greater-than-or-similar 100 ppm OH. A compendium of ESR/optical correlations taken from the literature points to the most likely origins of many defect-related optical absorption bands in the visible, ultraviolet and vacuum-ultraviolet spectral regions. Others of these bands have been ascribed to interstitial O2, O3 and Cl2 molecules on the basis of similarities of their spectral positions and widths to those of the corresponding species in the gas phase. RP GRISCOM, DL (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 0 TC 25 Z9 25 U1 3 U2 14 PU CERAMIC SOC JAPAN-NIPPON SERAMIKKUSU KYOKAI PI TOKYO PA 22-17 HYAKUNIN-CHO SHINJUKU-KU, TOKYO 169, JAPAN SN 0914-5400 J9 NIPPON SERAM KYO GAK PD OCT PY 1991 VL 99 IS 10 BP 923 EP 942 PG 20 WC Materials Science, Ceramics SC Materials Science GA GK934 UT WOS:A1991GK93400011 ER PT J AU CIOTTI, AJ SWIGERT, CJ AF CIOTTI, AJ SWIGERT, CJ TI SIMULTANEOUS MANIFESTATION OF GUILLAIN-BARRE AND MYOFASCIAL PAIN DYSFUNCTION SYNDROMES - A CASE-REPORT SO ORAL SURGERY ORAL MEDICINE ORAL PATHOLOGY ORAL RADIOLOGY AND ENDODONTICS LA English DT Article AB Guillain-Barre syndrome is a neurologic disorder resulting primarily in muscle paralysis with possible mortality. Although several etiologic factors have been implicated, the cause of the disease remains unknown. This article reviews a case in which a patient was referred with symptoms of myofascial pain dysfunction syndrome with development of Guillain-Barre syndrome manifesting in the head and neck region. Diagnostic techniques and management are also discussed. C1 UNIV OKLAHOMA,HLTH SCI CTR,COLL DENT,OKLAHOMA CITY,OK 73190. RP CIOTTI, AJ (reprint author), USN,DENT CLIN,NORFOLK,VA 23455, USA. NR 9 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 1079-2104 J9 ORAL SURG ORAL MED O JI Oral Surg. Oral Med. Oral Pathol. Oral Radiol. Endod. PD OCT PY 1991 VL 72 IS 4 BP 440 EP 442 DI 10.1016/0030-4220(91)90556-R PG 3 WC Dentistry, Oral Surgery & Medicine SC Dentistry, Oral Surgery & Medicine GA GK754 UT WOS:A1991GK75400013 PM 1923443 ER PT J AU KIRSS, RU BROWN, DW HIGA, KT GEDRIDGE, RW AF KIRSS, RU BROWN, DW HIGA, KT GEDRIDGE, RW TI PYROLYSIS PATHWAYS OF SYMMETRICAL AND UNSYMMETRICAL ORGANOTELLURIUM(II) COMPOUNDS SO ORGANOMETALLICS LA English DT Article ID METALORGANIC GROWTH; ALLYLIC RADICALS; HGCDTE; CDTE; TELLURIDE; FILMS AB Pyrolytic decompositions of (i)Pr2Te, (t)Bu2Te, (allyl)2Te, (2-methylallyl)2Te, and (3-methyl-3-butenyl)2Te were investigated by using a combination of gas chromatography and gas chromatography/mass spectroscopy. Product distributions suggested that several competing pathways were operating. Evidence for tellurium-carbon bond homolysis was observed through variable-concentration and trapping experiments. A beta-hydrogen elimination pathway was proposed to account for the observation of 2-methyl-2-propanetellurol and di-tert-butyl ditelluride in the pyrolysis of ((t)Bu)2Te. Both (i)PrTeH and diisopropyl ditelluride were observed during pyrolysis of (i)Pr2Te. Substituted hexadienes were the predominant product in the pyrolytic decomposition of allyltellurium compounds. The observation of three isomeric dienes during decomposition of (3-methyl-3-butenyl)2Te was inconsistent with an intramolecular pathway, suggesting a bond homolysis pathway for all three allyltellurium complexes. By comparison, decomposition of diallyl selenide yields propene as the major product. An "ene" pathway was proposed to account for these observations. Gas-phase pyrolytic decomposition of a series of unsymmetrical tellurium, MeTeR for R = allyl, 2-methylallyl, tert-butyl, and benzyl, led to the formation of MeTeTeMe and MeTeMe as the only observed Te-containing products. Radical coupling products, 1.5-hexadiene, 2,5-dimethylhexadiene, and bibenzyl, were the only observed organic products. Decomposition proceeded by bond homolysis; MeTe. and R. were generated. Evidence for a competing beta-hydrogen elimination pathway was observed in the decomposition of MeTu(t)Bu. The product distributions from the thermal decomposition of the unsymmetrical tellurium compounds were inconsistent with symmetrization prior to decomposition. C1 USN,CTR WEAP,CHINA LAKE,CA 93555. ADV TECHNOL MAT,DANBURY,CT 06810. NR 30 TC 23 Z9 23 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0276-7333 J9 ORGANOMETALLICS JI Organometallics PD OCT PY 1991 VL 10 IS 10 BP 3589 EP 3596 DI 10.1021/om00056a032 PG 8 WC Chemistry, Inorganic & Nuclear; Chemistry, Organic SC Chemistry GA GK143 UT WOS:A1991GK14300032 ER PT J AU BROOK, I AF BROOK, I TI THE AEROBIC AND ANAEROBIC MICROBIOLOGY OF NEONATAL BREAST ABSCESS SO PEDIATRIC INFECTIOUS DISEASE JOURNAL LA English DT Note DE BREAST ABSCESS; NEWBORN; BACTEROIDES SP; STAPHYLOCOCCUS-AUREUS; PEPTOSTREPTOCOCCUS C1 USN HOSP,DEPT PEDIAT,BETHESDA,MD 20814. NR 14 TC 10 Z9 10 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 OCT PY 1991 VL 10 IS 10 BP 785 EP 786 DI 10.1097/00006454-199110000-00014 PG 2 WC Immunology; Infectious Diseases; Pediatrics SC Immunology; Infectious Diseases; Pediatrics GA GJ515 UT WOS:A1991GJ51500015 PM 1945584 ER PT J AU THOMAS, JR AHLERS, ST AF THOMAS, JR AHLERS, ST TI NEUROPEPTIDE-Y BOTH IMPROVES AND IMPAIRS DELAYED MATCHING-TO-SAMPLE PERFORMANCE IN RATS SO PHARMACOLOGY BIOCHEMISTRY AND BEHAVIOR LA English DT Article DE NEUROPEPTIDE-Y; NPY; MATCHING-TO-SAMPLE; WORKING MEMORY; SHORT-TERM MEMORY; REFERENCE MEMORY; MEMORY MODULATION; PROACTIVE INTERFERENCE; RATS ID PROACTIVE-INTERFERENCE; ALZHEIMERS-DISEASE; ANIMAL MEMORY; BRAIN; IMMUNOREACTIVITY; HIPPOCAMPUS; RECEPTORS; BINDING AB Neuropeptide-Y (NPY) was administered intracerebroventricularly to rats performing on delayed matching-to-sample (DMTS) to determine if NPY modulates short-term (working) memory. Rats administered saline demonstrated a characteristic DMTS delay gradient in which accuracy decreased as the delay interval between sample and comparison stimuli increased from 2 to 8 to 16 seconds. At 8- and 16-second delays, low doses of NPY (0.25 and 0.5 nmol/kg) increased matching accuracy. As doses increased from 1 to 16 nmol/kg, accuracy decreased in a dose- and delay-dependent manner. NPY effects were specific to working memory, since NPY did not affect accuracy of responses to the sample stimulus (reference memory). At higher doses, a greater decline in accuracy occurred when the correct stimulus was on the opposite side from the response on the previous trial compared to accuracy when the previous response was on the same side. These data show NPY may both improve and impair accuracy on DMTS and that some portion of impairment is due to proactive interference resulting from previous trials. C1 USN,MED RES INST,DEPT ENVIRONM MED,DIV BEHAV NEUROSCI,BETHESDA,MD 20889. NR 40 TC 7 Z9 7 U1 0 U2 3 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0091-3057 J9 PHARMACOL BIOCHEM BE JI Pharmacol. Biochem. Behav. PD OCT PY 1991 VL 40 IS 2 BP 417 EP 422 DI 10.1016/0091-3057(91)90573-K PG 6 WC Behavioral Sciences; Neurosciences; Pharmacology & Pharmacy SC Behavioral Sciences; Neurosciences & Neurology; Pharmacology & Pharmacy GA GQ882 UT WOS:A1991GQ88200035 PM 1805244 ER PT J AU COHEN, RE ISAAK, DG AF COHEN, RE ISAAK, DG TI THERMODYNAMIC AND ELASTIC PROPERTIES OF A MANY-BODY MODEL FOR SIMPLE OXIDES - COMMENT SO PHYSICAL REVIEW B LA English DT Letter ID INDUCED BREATHING MODEL; ALKALINE-EARTH OXIDES; DYNAMICS AB In a recent paper, Agnon and Bukowinski state that a 50% change in a certain parameter in the potential-induced-breathing model changes the elastic constant C(s) = (C-11 - C-12)/2 by 40 GPa in MgO. We show that actually a change in this parameter by 200% affects C(s) by less than 0.04% at 300 K and 0.1% at 2000 K. The origin of the sensitivity that they found is possibly due to an inherent instability in their empirical model. C1 CARNEGIE INST WASHINGTON,GEOPHYS LAB,CTR HIGH PRESSURE RES,WASHINGTON,DC 20008. USN,RES LAB,COMPLEX SYST THEORY BRANCH,WASHINGTON,DC 20375. RP COHEN, RE (reprint author), CARNEGIE INST WASHINGTON,GEOPHYS LAB,WASHINGTON,DC 20008, USA. RI Cohen, Ronald/B-3784-2010 OI Cohen, Ronald/0000-0001-5871-2359 NR 8 TC 0 Z9 0 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD OCT 1 PY 1991 VL 44 IS 13 BP 7106 EP 7107 DI 10.1103/PhysRevB.44.7106 PG 2 WC Physics, Condensed Matter SC Physics GA GH807 UT WOS:A1991GH80700077 ER PT J AU SINGH, DJ AF SINGH, DJ TI ADEQUACY OF THE LOCAL-SPIN-DENSITY APPROXIMATION FOR GD SO PHYSICAL REVIEW B LA English DT Article ID RARE-EARTH-METALS; ELECTRONIC-STRUCTURE; BRILLOUIN-ZONE; TOTAL-ENERGY; SPECIAL POINTS; GADOLINIUM; PRESSURE; PHASES AB Highly converged local-spin-density-approximation (LSDA) calculations for ferromagnetic hcp Gd have been performed using an extended general-potential linearized augmented-plane-wave method. These calculations are used to assess the adequacy of the LSDA for this material. It is found that, while the calculated ground-state properties are in better agreement with experiment than is the case for elements with open 4f shell, the LSDA does not provide a fully satisfactory description of this material. On the other hand, an analysis of the electronic structure suggests that a model with localized f electrons is unsuitable for Gd. RP SINGH, DJ (reprint author), USN,RES LAB,COMPLEX SYST THEORY BRANCH,WASHINGTON,DC 20375, USA. RI Singh, David/I-2416-2012 NR 34 TC 69 Z9 69 U1 1 U2 2 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD OCT 1 PY 1991 VL 44 IS 14 BP 7451 EP 7454 DI 10.1103/PhysRevB.44.7451 PG 4 WC Physics, Condensed Matter SC Physics GA GH808 UT WOS:A1991GH80800034 ER PT J AU SINGH, D CLOUGHERTY, DP MACLAREN, JM ALBERS, RC WANG, CS AF SINGH, D CLOUGHERTY, DP MACLAREN, JM ALBERS, RC WANG, CS TI INFLUENCE OF THE LOCAL-SPIN-DENSITY CORRELATION FUNCTIONAL ON THE STABILITY OF BCC FERROMAGNETIC IRON SO PHYSICAL REVIEW B LA English DT Note ID GROUND-STATE PROPERTIES; BRILLOUIN-ZONE; SPECIAL POINTS; TOTAL-ENERGY AB The influence of local-spin-dependent correlation effects on the predicted stable ground-state phase of iron is reexamined with use of general-potential linearized augmented-plane-wave calculations. Differences in the form of the Vosko-Wilk-Nusair (VWN) local-spin-density functional used in previous studies are noted, since in previous studies significant additional approximations were made with respect to those of Vosko, Wilk, and Nusan [Can. J. Phys. 58, 1200 (1980)] and of MacLaren, Clougherty, and Albers [Phys. Rev. B 42, 3205 (1990)]. While the results of previous linear muffin-tin orbital calculations using the VWN functional predict a bcc ferromagnetic ground state, the present calculations show that the VWN spin-correlation effects fail to stabilize a bcc ground state. Considerable sensitivity to the form of the spin interpolation is found. C1 UNIV CALIF SANTA BARBARA,DEPT PHYS,SANTA BARBARA,CA 93106. TULANE UNIV,DEPT PHYS,NEW ORLEANS,LA 70118. UNIV CALIF LOS ALAMOS SCI LAB,DIV THEORET,LOS ALAMOS,NM 87545. UNIV MARYLAND,DEPT PHYS & ASTRON,COLLEGE PK,MD 20742. RP SINGH, D (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. RI Singh, David/I-2416-2012; Clougherty, Dennis/A-4519-2008 OI Clougherty, Dennis/0000-0002-7299-4898 NR 28 TC 23 Z9 23 U1 0 U2 1 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD OCT 1 PY 1991 VL 44 IS 14 BP 7701 EP 7703 DI 10.1103/PhysRevB.44.7701 PG 3 WC Physics, Condensed Matter SC Physics GA GH808 UT WOS:A1991GH80800062 ER PT J AU SINGH, DJ PICKETT, WE AF SINGH, DJ PICKETT, WE TI GRADIENT-CORRECTED DENSITY-FUNCTIONAL STUDIES OF CACUO2 SO PHYSICAL REVIEW B LA English DT Note ID ELECTRONIC-STRUCTURE; BRILLOUIN-ZONE; SPECIAL POINTS; GROUND-STATE; PARENT; ENERGY; SUPERCONDUCTORS; OXIDES AB A search for an antiferromagnetic ground state in CaCuO2, using gradient-corrected local-spin-density functionals, is reported. It is found that, as with the local-spin-density approximation, a paramagnetic metallic ground state is predicted, in disagreement with experiment. The gradient corrections do, however, bring this material closer to an antiferromagnetic instability. RP SINGH, DJ (reprint author), USN,RES LAB,COMPLEX SYST THEORY BRANCH,WASHINGTON,DC 20375, USA. RI Singh, David/I-2416-2012 NR 30 TC 25 Z9 25 U1 0 U2 2 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD OCT 1 PY 1991 VL 44 IS 14 BP 7715 EP 7717 DI 10.1103/PhysRevB.44.7715 PG 3 WC Physics, Condensed Matter SC Physics GA GH808 UT WOS:A1991GH80800066 ER PT J AU GRINSTEIN, FF ORAN, ES BORIS, JP AF GRINSTEIN, FF ORAN, ES BORIS, JP TI PRESSURE FIELD, FEEDBACK, AND GLOBAL INSTABILITIES OF SUBSONIC SPATIALLY DEVELOPING MIXING LAYERS SO PHYSICS OF FLUIDS A-FLUID DYNAMICS LA English DT Article ID FREE SHEAR LAYERS; REYNOLDS-NUMBER; DYNAMICS; MODES; FLOWS; JET AB Two-dimensional numerical simulations of compressible, subsonic, planar shear flows, are used to investigate the role of feedback in the reinitiation of vortex roll-up. The study deals with unforced, spatially evolving mixing layers for which the propagation of acoustic disturbances can be resolved and boundary effects are ensured to be negligible. The calculated pattern of coherent structures shows global self-sustaining instabilities in which new vortex roll-ups are triggered in the initial shear layer by pressure disturbances originating in the fluid accelerations downstream. This reinitiation mechanism, absent in the linear treatments of stability, is demonstrated conclusively here and examined as a function of Mach number and free-stream velocity ratio. The global instability becomes less efficient in reinitiating vortex roll-up in the initial shear layer when the acoustic propagation velocities on the sides of the mixing layer approach each other, i.e., as the incompressible regime is approached, and as the free-stream velocity ratios approach unity. RP GRINSTEIN, FF (reprint author), USN,RES LAB,COMP PHYS & FLUID DYNAM LAB,WASHINGTON,DC 20375, USA. NR 32 TC 19 Z9 19 U1 0 U2 0 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 OCT PY 1991 VL 3 IS 10 BP 2401 EP 2409 DI 10.1063/1.858178 PG 9 WC Mechanics; Physics, Fluids & Plasmas SC Mechanics; Physics GA GM595 UT WOS:A1991GM59500011 ER PT J AU GUZDAR, PN LIU, CS LEHMBERG, RH AF GUZDAR, PN LIU, CS LEHMBERG, RH TI THE EFFECT OF BANDWIDTH ON THE CONVECTIVE RAMAN INSTABILITY IN INHOMOGENEOUS PLASMAS SO PHYSICS OF FLUIDS B-PLASMA PHYSICS LA English DT Article ID INDUCED SPATIAL INCOHERENCE; PARAMETRIC-INSTABILITIES; SCATTERING; LIGHT AB The effect of bandwidth on the convective amplification of the Raman instability in the underdense, inhomogeneous plasma is investigated. For the case when the homogeneous growth rate gamma-0 < 2 x 10(-4) esu at 10(5) W/cm2). Furthermore, an etalon effect in the as-grown film enhances the four-wave signal by nearly an order of magnitude. We also present the results of a calculation which incorporates the Pb1-xSnxSe band structure and accounts in detail for carrier and lattice heating. Without any adjustable parameters, the theory accurately reproduces both the magnitude and the intensity-dependence of chi(3). C1 USN,CTR SURFACE WEAP,SILVER SPRING,MD 20910. RP YOUNGDALE, ER (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 23 TC 1 Z9 1 U1 1 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 OCT PY 1991 VL 80 IS 2 BP 95 EP 99 DI 10.1016/0038-1098(91)90294-6 PG 5 WC Physics, Condensed Matter SC Physics GA GK854 UT WOS:A1991GK85400002 ER PT J AU CALVERT, JM DULCEY, CS PECKERAR, MC SCHNUR, JM GEORGER, JH CALABRESE, GS SRICHAROENCHAIKIT, P AF CALVERT, JM DULCEY, CS PECKERAR, MC SCHNUR, JM GEORGER, JH CALABRESE, GS SRICHAROENCHAIKIT, P TI NEW SURFACE IMAGING TECHNIQUES FOR SUB-0.5 MICROMETER OPTICAL LITHOGRAPHY SO SOLID STATE TECHNOLOGY LA English DT Article ID RESOLUTION AB Two new optically-based surface imaging processes for fabricating sub-0.5-mu-m features are described. In the first, a monolayer film is patterned with deep UV radiation and then metallized by electroless deposition to form a thin metal layer only on the unexposed areas. The metallized film provides an effective reactive ion etch barrier. Features with 0.3-mu-m linewidth in polysilicon and working transistor test structures have been demonstrated with this process. In the second approach, a 1 to 2-mu-m (planarizing) photoresist layer is exposed in its near-surface region. A thin metal layer is then formed on unexposed photoresist regions by electroless deposition and serves as an etch mask for subsequent pattern transfer. In this process variation, features with < 0.5-mu-m linewidth have been printed using i-line and 248 nm excimer laser tools. C1 SHIPLEY CO INC,MARLBOROUGH,MA. GEOCENTERS INC,CELL & SURFACING PATTERNING GRP,FT WASHINGTON,MD. RP CALVERT, JM (reprint author), USN,RES LAB,CTR BIOMOLEC SCI & ENGN,WASHINGTON,DC 20375, USA. NR 21 TC 41 Z9 41 U1 0 U2 2 PU PENNWELL PUBL CO SOLID STATE TECHNOLOGY OFFICE PI NASHUA PA TEN TARA BLVD 5TH FLOOR, NASHUA, NH 03062-2801 SN 0038-111X J9 SOLID STATE TECHNOL JI Solid State Technol. PD OCT PY 1991 VL 34 IS 10 BP 77 EP 82 PG 6 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Condensed Matter SC Engineering; Physics GA GK131 UT WOS:A1991GK13100005 ER PT J AU MEIER, RR AF MEIER, RR TI ULTRAVIOLET SPECTROSCOPY AND REMOTE-SENSING OF THE UPPER-ATMOSPHERE SO SPACE SCIENCE REVIEWS LA English DT Review ID ELECTRON-IMPACT EXCITATION; SCHUMANN-RUNGE BANDS; MOLECULAR-OXYGEN PHOTODISSOCIATION; AURORAL OPTICAL MEASUREMENTS; LYMAN-ALPHA-MEASUREMENTS; BIRGE-HOPFIELD BANDS; HE-II 304-A; DEPENDENT FREQUENCY REDISTRIBUTION; PHOTOIONIZATION CROSS-SECTIONS; AMBIENT PHOTOELECTRON-SPECTRUM AB The Earth's ultraviolet airglow contains fundamental diagnostic information about the state of its upper atmosphere and ionosphere. Our understanding of the excitation and emission processes which are responsible for the airglow has undergone dramatic evolution from the earliest days of space research through the past several years during which a wealth of new information has been published from high-resolution spectroscopy and imaging experiments. This review of the field begins with an overview of the phenomenology: how the Earth looks in the ultraviolet. Next the basic processes leading to excitation of atomic and molecular energy states are discussed. These concepts are developed from first principles and applied to selected examples of day and night airglow; a detailed review of radiation transport theory is included. This is followed by a comprehensive examination of the current status of knowledge of individual emission features seen in the airglow, in which atomic physics issues as well as relevant atmospheric observations of major and minor neutral and ionic constituents are addressed. The use of airglow features as remote sensing observables is then examined for the purpose of selecting those species most useful as diagnostics of the state of the thermosphere and ionosphere. Imaging of the plasmasphere and magnetosphere is also briefly considered. A summary of upcoming UV remote sensing missions is provided. RP MEIER, RR (reprint author), USN,RES LAB,EO HULBURT CTR SPACE RES,WASHINGTON,DC 20375, USA. RI Meier, Robert/G-4749-2014 OI Meier, Robert/0000-0001-8497-7115 NR 396 TC 324 Z9 333 U1 10 U2 30 PU KLUWER ACADEMIC PUBL PI DORDRECHT PA SPUIBOULEVARD 50, PO BOX 17, 3300 AA DORDRECHT, NETHERLANDS SN 0038-6308 J9 SPACE SCI REV JI Space Sci. Rev. PD OCT PY 1991 VL 58 IS 1-2 BP 1 EP 185 DI 10.1007/BF01206000 PG 185 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA GH216 UT WOS:A1991GH21600001 ER PT J AU EDDY, CR SARTWELL, BD YOUCHISON, DL AF EDDY, CR SARTWELL, BD YOUCHISON, DL TI DIAMOND THIN-FILM GROWTH ON SILICON AT TEMPERATURES BETWEEN 500-DEGREES-C AND 600-DEGREES-C USING AN ELECTRON-CYCLOTRON RESONANCE MICROWAVE PLASMA SOURCE SO SURFACE & COATINGS TECHNOLOGY LA English DT Article ID CHEMICAL VAPOR-DEPOSITION; RAMAN-SPECTROSCOPY; LOW-PRESSURE; CVD AB The possibility of low temperature growth of diamond films on silicon substrates was investigated using an electron cyclotron resonance microwave plasma source to provide activated precursor species from CH4-H2 and CO-H2 gas mixtures at low pressures (1.33 Pa (10 mTorr) to 5.32 Pa (40 mTorr)). Diamond crystallites and continuous diamond films were nucleated and grown on (100) and (111) oriented silicon substrates over the temperature range 500-600-degrees-C. Above 600-degrees-C, microcrystalline graphite was formed. The morphology of the films was investigated using scanning electron microscopy (SEM) and the structure was investigated using laser micro-Raman spectroscopy and X-ray diffraction (XRD) as a function of the deposition parameters. The Raman and XRD results indicated that the films were nanocrystalline with a high defect concentration. RP EDDY, CR (reprint author), USN,RES LAB,CODE 4675,WASHINGTON,DC 20375, USA. NR 27 TC 23 Z9 23 U1 0 U2 0 PU ELSEVIER SCIENCE SA LAUSANNE PI LAUSANNE 1 PA PO BOX 564, 1001 LAUSANNE 1, SWITZERLAND SN 0257-8972 J9 SURF COAT TECH JI Surf. Coat. Technol. PD OCT 1 PY 1991 VL 48 IS 1 BP 69 EP 79 DI 10.1016/0257-8972(91)90129-K PG 11 WC Materials Science, Coatings & Films; Physics, Applied SC Materials Science; Physics GA GK375 UT WOS:A1991GK37500009 ER PT J AU HUISMAN, TK SANDS, JP AF HUISMAN, TK SANDS, JP TI RENAL-CELL CARCINOMA WITH SOLITARY METACHRONOUS CONTRALATERAL ADRENAL METASTASIS - EXPERIENCE WITH 2 CASES AND REVIEW OF THE LITERATURE SO UROLOGY LA English DT Review AB We report on 2 cases of renal cell carcinoma with solitary metachronous contralateral adrenal metastasis occurring up to four years after radical nephrectomy. Both patients were treated with adrenalectomy and steroid replacement. One patient died with distant metastases twenty-eight months after adrenalectomy and the other is alive with no evidence of disease four years postoperatively. Such a presentation of hypernephroma is rare, with only 1 such case having been found in the literature. RP HUISMAN, TK (reprint author), USN HOSP,DEPT UROL,SAN DIEGO,CA 92134, USA. NR 16 TC 15 Z9 15 U1 0 U2 0 PU CAHNERS PUBL CO PI NEW YORK PA 249 WEST 17 STREET, NEW YORK, NY 10011 SN 0090-4295 J9 UROLOGY JI UROLOGY PD OCT PY 1991 VL 38 IS 4 BP 364 EP 368 DI 10.1016/0090-4295(91)80155-Z PG 5 WC Urology & Nephrology SC Urology & Nephrology GA GJ133 UT WOS:A1991GJ13300019 PM 1755149 ER PT J AU HOFF, HA CRAIGIE, CJ DANTSKER, E PANDE, CS AF HOFF, HA CRAIGIE, CJ DANTSKER, E PANDE, CS TI COLUMNAR GROWTH IN COMBUSTION DEPOSITED DIAMOND THIN-FILMS SO APPLIED PHYSICS LETTERS LA English DT Article ID GRAIN-GROWTH; MICROSTRUCTURE; SIMULATION AB The morphology of the nucleation and growth surfaces of oxygen-acetylene combustion deposited diamond thin films has been studied using scanning electron microscopy. The diameters of both nucleation cells and growth surface grains have been measured and analyzed statistically. The general shape of the distributions is found to change from nucleation to growth surface for each film. The frequency distribution of cells is generally normal, whereas, the distribution for the growth surface is found to be always lognormal. The change in shape of the distributions from normal for the nucleation surface to lognormal for the growth surface can be explained from a stochastic theory of growth. C1 UNIV ARIZONA,TUCSON,AZ 85721. UNIV MARYLAND,COLLEGE PK,MD 20742. RP HOFF, HA (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 16 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 0003-6951 J9 APPL PHYS LETT JI Appl. Phys. Lett. PD SEP 30 PY 1991 VL 59 IS 14 BP 1693 EP 1695 DI 10.1063/1.106220 PG 3 WC Physics, Applied SC Physics GA GH409 UT WOS:A1991GH40900014 ER PT J AU SINGER, IL FAYEULLE, S EHNI, PD AF SINGER, IL FAYEULLE, S EHNI, PD TI FRICTION AND WEAR BEHAVIOR OF TIN IN AIR - THE CHEMISTRY OF TRANSFER FILMS AND DEBRIS FORMATION SO WEAR LA English DT Article; Proceedings Paper CT INTERNATIONAL CONF ON WEAR OF MATERIALS CY APR 07-11, 1991 CL ORLANDO, FL ID CHEMICAL VAPOR-DEPOSITION; TITANIUM NITRIDE COATINGS; TRIBOLOGICAL BEHAVIOR; OXIDATIONAL WEAR; SPUTTERED TIN; 52100 STEEL; OXIDES; SPECTROSCOPY; RESISTANCE; ENERGY AB Friction tests were performed on TiN-coated substrates at low speed (less than 0.1 m s-1) in air. Optical (Nomarski) and scanning electron microscopy, Auger electron spectroscopy and transmission electron microscopy (TEM) were used to characterize the transfer films and debris generated during sliding against steel and sapphire balls. Friction coefficients of steel against rougher (R(a) almost-equal-to 60-100 nm) TiN coatings started and remained relatively high (0.5-0.7) owing to wear and transfer of the steel. After the TiN coating was polished (R(a) almost-equal-to 4 nm), transfer was reduced and initial friction coefficients ranged from 0.15 to 0.2. Initial friction coefficients with sapphire balls sliding against polished TiN were even lower (0.05). However, friction coefficients with both balls increased as debris formed and transferred to the wear track. Auger analysis showed that steel balls accumulated metallic iron and/or iron oxide as well as titanium oxide layers and debris, whereas sapphire balls acquired only titanium oxide transfer layers. TEM of debris stripped from contact areas of steel and sapphire balls identified the phases of debris as a rhombohedral ternary oxide (FeTiO3/alpha-Fe2O3) and rutile (TiO2) respectively; morphologies were either thin, uniform flakes - prevalent in low friction sliding - or spherical clusters. A thermochemical basis for oxide debris formation is given and the friction behavior is interpreted in terms of an oxide wear mechanism. RP SINGER, IL (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 42 TC 91 Z9 92 U1 0 U2 14 PU ELSEVIER SCIENCE SA LAUSANNE PI LAUSANNE 1 PA PO BOX 564, 1001 LAUSANNE 1, SWITZERLAND SN 0043-1648 J9 WEAR JI Wear PD SEP 30 PY 1991 VL 149 IS 1-2 BP 375 EP 394 DI 10.1016/0043-1648(91)90386-9 PG 20 WC Engineering, Mechanical; Materials Science, Multidisciplinary SC Engineering; Materials Science GA GL443 UT WOS:A1991GL44300027 ER PT J AU RICE, BM CHABALOWSKI, CF ADAMS, GF MOWREY, RC PAGE, M AF RICE, BM CHABALOWSKI, CF ADAMS, GF MOWREY, RC PAGE, M TI A COMPARATIVE-STUDY OF THE REACTION DYNAMICS OF A MODEL SYSTEM USING DIFFERENT CRITERIA IN PARAMETERIZING THE POTENTIAL-ENERGY FUNCTION SO CHEMICAL PHYSICS LETTERS LA English DT Article ID MOLECULAR DIPOLE-MOMENT; ATOMIC POINT CHARGES; 2ND DERIVATIVES; CARTESIAN DERIVATIVES; PLANAR DIMERS; MECHANICS AB A comparative study of the reaction dynamics of a model system using a potential energy function that has been parameterized according to two different criteria is presented. The molecule studied is methylene nitramine, CH2NNO2, and the reaction studied is the N-N bond scission reaction. A mathematical description of the potential energy surface for the system was developed, and parameters for the individual terms in the model were fitted to data obtained from ab initio computations. The first model was fitted to the Cartesian second derivatives of the energy for equilibrium methylene nitramine, while the second model was fitted using the computed harmonic frequencies for the molecule. Unimolecular decay curves for the N-N bond scission reaction were computed at six energies between 2.9384 and 4.1884 eV. Not only do the two models disagree in the computed reaction rates, but the rates predicted by model I are first order and time independent while those obtained with model II indicate erratic and non-statistical behavior. This study shows the sensitivity of dynamics calculations to quantitative differences in potential energy surfaces fitted to different aspects of electronic structure calculations. C1 USN,RES LAB,WASHINGTON,DC 20375. RP RICE, BM (reprint author), USA,BALLIST RES LABS,SLCBR 1B1,ABERDEEN PROVING GROUND,MD 21005, USA. NR 16 TC 9 Z9 9 U1 2 U2 2 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 SEP 27 PY 1991 VL 184 IS 4 BP 335 EP 342 DI 10.1016/0009-2614(91)85133-H PG 8 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA GJ241 UT WOS:A1991GJ24100016 ER PT J AU RICHARDS, AL HYAMS, KC MERRELL, BR DASCH, GA WOODY, JN KSIAZEK, TG LEDUC, JW WATTS, DM AF RICHARDS, AL HYAMS, KC MERRELL, BR DASCH, GA WOODY, JN KSIAZEK, TG LEDUC, JW WATTS, DM TI MEDICAL ASPECTS OF OPERATION DESERT STORM SO NEW ENGLAND JOURNAL OF MEDICINE LA English DT Letter C1 USN,MED RES & DEV COMMAND,BETHESDA,MD 20889. USA,MED RES INST INFECT DIS,FT DETRICK,MD 21702. USN,MED RES UNIT 3,CAIRO,EGYPT. RP RICHARDS, AL (reprint author), USN,INST MED RES,WASHINGTON,DC 20350, USA. NR 3 TC 10 Z9 10 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 SEP 26 PY 1991 VL 325 IS 13 BP 970 EP 970 PG 1 WC Medicine, General & Internal SC General & Internal Medicine GA GF856 UT WOS:A1991GF85600032 ER PT J AU OLSEN, AW KAFAFI, ZH AF OLSEN, AW KAFAFI, ZH TI GOLD CLUSTER LADEN POLYDIACETYLENES - NOVEL MATERIALS FOR NONLINEAR OPTICS SO JOURNAL OF THE AMERICAN CHEMICAL SOCIETY LA English DT Note ID METAL PARTICLES; COLLOIDAL GOLD RP KAFAFI, ZH (reprint author), USN, RES LAB, DIV OPT SCI, WASHINGTON, DC 20375 USA. NR 18 TC 80 Z9 81 U1 1 U2 5 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0002-7863 J9 J AM CHEM SOC JI J. Am. Chem. Soc. PD SEP 25 PY 1991 VL 113 IS 20 BP 7758 EP 7760 DI 10.1021/ja00020a046 PG 3 WC Chemistry, Multidisciplinary SC Chemistry GA GH058 UT WOS:A1991GH05800046 ER PT J AU HORWITZ, JS GRABOWSKI, KS CHRISEY, DB LEUCHTNER, RE AF HORWITZ, JS GRABOWSKI, KS CHRISEY, DB LEUCHTNER, RE TI INSITU DEPOSITION OF EPITAXIAL PBZRXTI(1-X)O3 THIN-FILMS BY PULSED LASER DEPOSITION SO APPLIED PHYSICS LETTERS LA English DT Article ID FERROELECTRIC MEMORIES; GROWTH AB Epitaxial thin films of PbZrxTi(1-x)O3 (PZT) with 0 less-than-or-equal-to x less-than-or-equal-to 0.6 have been deposited in situ by pulsed laser deposition from stoichiometric targets onto <100> oriented single crystals of MgO and SrTiO3. Film composition was extremely sensitive to the substrate temperature and the oxygen deposition pressure. In a high (200-300 mTorr) oxygen ambient, phase-pure <100> oriented PZT films (x = 0.54) were formed at a substrate temperature of 550-degrees-C on SrTiO3. On MgO, competition between formation of the ferroelectric phase and a nonferroelectric (pyrochlore) phase was observed for compositions near the morphotropic phase boundary (x approximately 0.54). Polycrystalline PZT films which were 70%-90% PZT were also deposited on Pt coated Si and GaAs under similar conditions. RP HORWITZ, JS (reprint author), USN,RES LAB,CODE 4670,WASHINGTON,DC 20375, USA. OI Grabowski, Kenneth/0000-0003-0816-001X NR 22 TC 137 Z9 138 U1 5 U2 22 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 SEP 23 PY 1991 VL 59 IS 13 BP 1565 EP 1567 DI 10.1063/1.106284 PG 3 WC Physics, Applied SC Physics GA GG105 UT WOS:A1991GG10500015 ER PT J AU HARSHAVARDHAN, KS RAMESH, R RAVI, TS SAMPERE, S INAM, A CHANG, CC HULL, G RAJESWARI, M SANDS, T VENKATESAN, T REEVES, M TKACZYK, JE LAY, KW AF HARSHAVARDHAN, KS RAMESH, R RAVI, TS SAMPERE, S INAM, A CHANG, CC HULL, G RAJESWARI, M SANDS, T VENKATESAN, T REEVES, M TKACZYK, JE LAY, KW TI YBA2CU3O7-X FILMS ON FLEXIBLE, PARTIALLY-STABILIZED ZIRCONIA SUBSTRATES WITH FULLY STABILIZED ZIRCONIA BUFFER LAYERS SO APPLIED PHYSICS LETTERS LA English DT Article ID CRITICAL CURRENT DENSITIES; THIN-FILMS; DEPOSITION AB Textured polycrystalline YBCO films with superconducting transition temperatures of approximately 90 K have been prepared on flexible zirconia substrates, partially stabilized by 3 mol % yttria. X-ray data suggest undesirable (013) and [(110) (103)] texture in minor amounts within the predominantly c-axis oriented film. The transmission electron microscope data reveal clean, special crystallographic as well as silicon contaminated grain boundaries containing amorphous phases. By depositing a zirconia buffer layer, fully stabilized by 9 mol % yttria, we have demonstrated that the normal-state metallic and superconducting properties of the YBCO films can be considerably improved. These films exhibit critical-current densities of approximately 0.9 X 10(4) A/cm2 at 77 K in zero field and 2 X 10(5) A/cm2 at 4.2 K in zero field. C1 BELLCORE,RED BANK,NJ 07701. UNIV MARYLAND,CTR SUPERCONDUCT RES,COLLEGE PK,MD 20742. UNIV MARYLAND,DEPT PHYS,COLLEGE PK,MD 20742. UNIV MARYLAND,DEPT ELECT ENGN,COLLEGE PK,MD 20742. USN,RES LAB,WASHINGTON,DC 20375. GE,CORP RES & DEV,SCHENECTADY,NY 12301. RI Sands, Timothy/D-2133-2009; Venkatesan, Thirumalai/E-1667-2013 OI Sands, Timothy/0000-0001-9718-6515; NR 10 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 0003-6951 J9 APPL PHYS LETT JI Appl. Phys. Lett. PD SEP 23 PY 1991 VL 59 IS 13 BP 1638 EP 1640 DI 10.1063/1.106255 PG 3 WC Physics, Applied SC Physics GA GG105 UT WOS:A1991GG10500041 ER PT J AU MILLER, JD SCHNEIDER, RF WEIDMAN, DJ UHM, HS NGUYEN, KT AF MILLER, JD SCHNEIDER, RF WEIDMAN, DJ UHM, HS NGUYEN, KT TI OBSERVATION OF PLASMA WAKE-FIELD EFFECTS DURING HIGH-CURRENT RELATIVISTIC ELECTRON-BEAM TRANSPORT SO PHYSICAL REVIEW LETTERS LA English DT Article ID ACCELERATION AB Modulation of the beam current has been observed during ion-focused-regime (IFR) transport of a high-power relativistic electron beam propagating through a low-density background plasma. In this experiment, a 1.7-MeV, 1-kA rise-time-sharpened electron beam is transported in a KrF-excimer-laser-produced IFR channel in trimethylamine gas. The IFR channel is immersed in a low-density plasma-filled transport tube. We present experimental measurements and computer simulations demonstrating modulation of this high-current relativistic electron beam near the low-density background plasma frequency. C1 MISSION RES CORP,NEWINGTON,VA 22122. ADV TECHNOL & RES,LAUREL,MD 20707. RP MILLER, JD (reprint author), USN,CTR SURFACE WARFARE,SILVER SPRING,MD 20903, USA. NR 23 TC 14 Z9 14 U1 0 U2 1 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0031-9007 J9 PHYS REV LETT JI Phys. Rev. Lett. PD SEP 23 PY 1991 VL 67 IS 13 BP 1747 EP 1750 DI 10.1103/PhysRevLett.67.1747 PG 4 WC Physics, Multidisciplinary SC Physics GA GG106 UT WOS:A1991GG10600020 ER PT J AU BOYER, JH HAAG, A SOONG, ML THANGARAJ, K PAVLOPOULOS, TG AF BOYER, JH HAAG, A SOONG, ML THANGARAJ, K PAVLOPOULOS, TG TI LASER ACTION FROM 2,6,8-TRISUBSTITUTED-1,3,5,7-TETRAMETHYL-PYRROMETHENE-BF2 COMPLEXES .2. SO APPLIED OPTICS LA English DT Note AB In laser activity 1,3,5,7-tetramethyl-2,6-dicarboethoxy-8-cyanopyrromethene-BF2 complex 5 under flash-lamp excitation was approximately 1.8 times more energy efficient than Rhodamine-B; about the same efficiency of Rhodamine-575 was found for 1,3,5,7-tetramethyl-2,6,8-triethylpyrromethene-BF2 complex 2 C1 UNIV NEW ORLEANS,DEPT CHEM,NEW ORLEANS,LA 70148. RP BOYER, JH (reprint author), USN,CTR OCEAN SYST,DEPT MARINE SCI & TECHNOL,SAN DIEGO,CA 92152, USA. NR 2 TC 39 Z9 39 U1 0 U2 1 PU OPTICAL SOC AMER PI WASHINGTON PA 2010 MASSACHUSETTS AVE NW, WASHINGTON, DC 20036 SN 0003-6935 J9 APPL OPTICS JI Appl. Optics PD SEP 20 PY 1991 VL 30 IS 27 BP 3788 EP 3789 PG 2 WC Optics SC Optics GA GJ124 UT WOS:A1991GJ12400002 ER PT J AU MEIER, DL SADUN, AC LIND, KR AF MEIER, DL SADUN, AC LIND, KR TI HEAVY, OVERPRESSURED JETS AND THE RADIO-SOURCE HERCULES-A SO ASTROPHYSICAL JOURNAL LA English DT Article DE GALAXIES - INDIVIDUAL (HERCULES A); GALAXIES - JETS; HYDRODYNAMICS ID MACH NUMBER JET; SURFACE BRIGHTNESS; TURBULENT; MODEL; RINGS AB We investigate the flow of jets with pressure and density initially much greater than the medium into which they are injected. While having many features in common with the classical light, pressure-balanced jets studied in recent investigations, heavy, overpressured jets differ in that they expand at the Mach angle and have a conical expansion shock and large convex Mach disk. The ''ice cream cone'' shape of these shocks should be visible in high-dynamic-range radio maps. Some numerical models are observed to recollimate, creating broader jets at lower density. We develop analytic expressions which describe the cocoon formation and recollimation processes. The concept of a jet with a large overpressure should be applicable to many situations where the observed jet has a conical appearance and, perhaps, recollimates. Under the assumption that the rings seen in high-resolution images of Hercules A are shocks, we model the western lobe of this source as a heavy overpressured flow where, about 20'' from the nucleus, the jet suddenly becomes much greater in pressure than the surrounding medium and freely expands. We argue that jet models which are supersonic with respect to both the internal and external speeds are applicable and find that, in spite of the prominent ring structure in Her A, the flow must be dominated by a smooth conical jet. This result is consistent with the kinematic model of Morrison, & Sadun. Although we do not numerically simulate the rings in the western lobe, our models are also consistent with MMS suggestion that the rings are weak spherical shocks in that flow: their size is small compared to the scale length for the sound speed to change. Depending on the exact flow velocity and Mach number, the jet may be initially heavy (eta-o > 1) compared to the ambient medium at the point where expansion begins. The flow becomes light (eta > 6 x 10(-3)) much further out due to the expansion and is able to produce the cocoon seen in low-resolution radio maps. We have tentatively identified the Mach disk, bow shock, and the plug in the radio map of the western lobe as the two outer arcs of emission and the space between them, respectively. The identification of these arcs as strong shocks is strengthened by their observed magnetic field structure. Additional studies are needed to understand ring formation and propagation in such flows and to understand why the sudden expansion in Her A takes place. The former problem can be addressed with detailed, high-resolution numerical studies of perturbed heavy, overpressured jets. The latter should benefit from high-resolution X-ray imaging of the inner arcminute of the Her A region to understand better the structure of the ambient medium and to determine what influence, if any, it may have on the jet flow. C1 AGNES SCOTT COLL,BRADLEY OBSERV,DECATUR,GA 30030. USN,RES LAB,CTR ADV SPACE SENSING,WASHINGTON,DC 20375. RP MEIER, DL (reprint author), CALTECH,JET PROP LAB,238-700,4800 OAK GROVE,PASADENA,CA 91109, USA. NR 20 TC 8 Z9 8 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 SEP 20 PY 1991 VL 379 IS 1 BP 141 EP 156 DI 10.1086/170491 PN 1 PG 16 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA GF749 UT WOS:A1991GF74900013 ER PT J AU WOOD, KS NORRIS, JP HERTZ, P VAUGHAN, BA MICHELSON, PF MITSUDA, K LEWIN, WHG VANPARADIJS, J PENNINX, W VANDERKLIS, M AF WOOD, KS NORRIS, JP HERTZ, P VAUGHAN, BA MICHELSON, PF MITSUDA, K LEWIN, WHG VANPARADIJS, J PENNINX, W VANDERKLIS, M TI SEARCHES FOR MILLISECOND PULSATIONS IN LOW-MASS X-RAY BINARIES SO ASTROPHYSICAL JOURNAL LA English DT Article DE NUMERICAL METHODS; STARS - NEUTRON; PULSARS; X-RAYS - BINARIES ID QUASI-PERIODIC OSCILLATIONS; MAGNETIC-FIELD DECAY; NEUTRON STARS; GLOBULAR-CLUSTERS; 6.1-MS PULSAR; GRAVITATIONAL-RADIATION; DISCOVERY; INTENSITY; EMISSION; BURST AB Recent observational and theoretical studies of low-mass X-ray binaries (LMXBs) have given rise to a new class of standard models. In these models, accretion torques have spun the neutron star primary up to millisecond rotation periods. The existence of both millisecond radio pulsars and quasi-periodic X-ray oscillations is interpreted as supporting millisecond spin periods. However, millisecond spin periods remain undetected in low-mass X-ray binaries. Detection of the low pulse fractions expected for binary millisecond X-ray pulsars requires long integration times to enhance signal to noise. One of the significant barriers to detection is the pulse phase modulation which occurs when signals are integrated over a significant portion of a binary orbital cycle. We derive an optimized one-parameter Coherence Recovery Technique (CRT) for recovery of phase coherence. This technique affords a large increase in sensitivity over the method of incoherent summation of Fourier power spectra. In CRT a sequence of quadratic time transformations is applied to the data, followed by a Fourier transform for each trial. One particular transformation results in maximal compensation for the phase modulation and minimization of frequency broadening in the power spectrum. We discuss the range of spin periods expected from LMXB phenomenology, describe necessary constraints on the application of CRT in terms of integration time and orbital parameters, and estimate the residual power unrecovered by the quadratic approximation for realistic cases. An alternative, equivalent CRT approach is described in which a single Fourier transform of the data is followed by the application of a Wiener filter matrix in frequency space. We have applied CRT to high time resolution observations (0.3-5 ms) of several LMXBs obtained with the Ginga and HEAO 1 X-ray satellites. We present upper limits on the pulsed fluxes from Sco X-1, GX 340+0, GX 5-1, GX 9+1, GX 17+2, 4U 1820-30, Cyg X-3, and Cyg X-2. The 95% confidence level upper limit to the pulse fraction for sinusoidal pulses from the two brightest sources observed, Sco X-1 and GX 5-1, is less than 0.7% for frequencies up to 512 Hz, and less than 0.4% for frequencies less than 100 Hz. Our study implies that pulsars in LMXBs must have low pulse fractions (A < 1%), have short pulse periods (P(pul) < 2 ms), or, in those cases where the orbital periods are unknown, be in binary orbits with short orbital periods (P(orb) < 3 hr). C1 STANFORD UNIV,DEPT PHYS,STANFORD,CA 94305. INST SPACE & ASTRONAUT SCI,KANAGAWA 229,JAPAN. UNIV AMSTERDAM,ASTRON INST ANTON PANNEKOEK,1018 WB AMSTERDAM,NETHERLANDS. CTR HIGH ENERGY ASTROPHYS,AMSTERDAM,NETHERLANDS. MIT,CTR SPACE RES,CAMBRIDGE,MA 02139. MIT,DEPT PHYS,CAMBRIDGE,MA 02139. RP WOOD, KS (reprint author), USN,RES LAB,EO HULBURT CTR SPACE RES,CODE 4121,WASHINGTON,DC 20375, USA. RI Mitsuda, Kazuhisa/C-2649-2008 NR 76 TC 41 Z9 41 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 SEP 20 PY 1991 VL 379 IS 1 BP 295 EP 309 DI 10.1086/170505 PN 1 PG 15 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA GF749 UT WOS:A1991GF74900027 ER PT J AU PHILLIPS, KJH FELDMAN, U AF PHILLIPS, KJH FELDMAN, U TI THE IRON-TO-CALCIUM ABUNDANCE RATIO IN THE 20X10(6) K-PLASMA OF MEDIUM AND LARGE SOLAR-FLARES SO ASTROPHYSICAL JOURNAL LA English DT Article DE SUN - ABUNDANCES; SUN - FLARES; SUN - X-RAYS ID DIELECTRONIC SATELLITE SPECTRA; HELIUM-LIKE IONS; RAYS AB The iron-to-calcium abundance ratio during several flares observed by instruments on the P78-1 and Solar Maximum Mission spacecraft has been determined using the intensity ratio of a dielectronic satellite line of Fe XXIV and the resonance line of Ca XIX. Values of A(Fe)/A(Ca) equal to 6.8 +/- 1.0 and 6.0 +/- 1.5 were derived from these data sets, respectively, the small difference being attributable to errors in the calculated instrument sensitivities. These values fall between two other determinations from X-ray spectra, but are less than the photospheric value. They are fairly constant from flare to flare, contrasting with other recent work which indicates strong flare-to-flare variations. C1 USN,RES LAB,EO HULBURT CTR SPACE RES,WASHINGTON,DC 20375. RP PHILLIPS, KJH (reprint author), RUTHERFORD APPLETON LAB,DIV ASTROPHYS,DIDCOT OX11 0QX,OXON,ENGLAND. NR 25 TC 16 Z9 16 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 SEP 20 PY 1991 VL 379 IS 1 BP 401 EP 405 DI 10.1086/170515 PN 1 PG 5 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA GF749 UT WOS:A1991GF74900037 ER PT J AU KEENAN, FP DUFTON, PL CONLON, ES BOYLAN, MB KINGSTON, AE WIDING, KG AF KEENAN, FP DUFTON, PL CONLON, ES BOYLAN, MB KINGSTON, AE WIDING, KG TI THE 3S23P 2P-3S3P2 4P INTERCOMBINATION LINES OF FE XIV IN THE SUN SO ASTROPHYSICAL JOURNAL LA English DT Article DE ATOMIC PROCESSES; SUN - CORONA; SUN - FLARES; SUN - SPECTRA; ULTRAVIOLET - SPECTRA ID ELECTRON-DENSITY DIAGNOSTICS; SOLAR-FLARES; XUV OBSERVATIONS; COMPACT FLARE; SKYLAB; SPECTRUM AB We have examined EUV spectra of solar flares obtained with the Naval Research Laboratory's S082A slitless spectrograph on board Skylab and provisionally identified the five components of the Fe XIV 3s(2)3p 2P-3s3p2 4P intercombination multiplet. A comparison of the observed Fe XIV line intensities with theoretical predictions reveals good agreement between theory and experiment, which tends to confirm our identifications and those made previously by Trabert, Hutton, and Martinson. The potential usefulness of the lines as electron density diagnostics is briefly discussed. C1 QUEENS UNIV BELFAST,DEPT APPL MATH & THEORET PHYS,BELFAST 1NN,NORTH IRELAND. USN,RES LAB,EO HULBURT CTR SPACE RES,WASHINGTON,DC 20375. RP KEENAN, FP (reprint author), QUEENS UNIV BELFAST,DEPT PURE & APPL PHYS,BELFAST 1NN,NORTH IRELAND. NR 20 TC 4 Z9 4 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 SEP 20 PY 1991 VL 379 IS 1 BP 406 EP 408 DI 10.1086/170516 PN 1 PG 3 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA GF749 UT WOS:A1991GF74900038 ER PT J AU MOWREY, RC BRENNER, DW DUNLAP, BI MINTMIRE, JW WHITE, CT AF MOWREY, RC BRENNER, DW DUNLAP, BI MINTMIRE, JW WHITE, CT TI SIMULATIONS OF C60 COLLISIONS WITH A HYDROGEN-TERMINATED DIAMOND (111) SURFACE SO JOURNAL OF PHYSICAL CHEMISTRY LA English DT Letter ID CARBON; C-60; BUCKMINSTERFULLERENE; IONS AB The stability of C60 during collisions with a hydrogen-terminated diamond {111} surface was studied by using molecular dynamics simulations. At a collision energy of 150 eV only nonreactive collisions occur. At higher energies nonreactive scattering and two types of reactive collisions occur: (1) exchange of one or more atoms between the molecule and the surface; (2) chemisorption of the C60 molecule. No dissociation of the rebounding molecules was observed on the time scale of the simulations. However, the scattered molecules contain a large amount of internal energy, which suggests that dissociation may occur at longer times. RP MOWREY, RC (reprint author), USN,RES LAB,THEORET CHEM SECT,CODE 6119,WASHINGTON,DC 20375, USA. RI Brenner, Donald/D-1741-2009; OI Mintmire, John/0000-0002-6551-0349; Dunlap, Brett/0000-0003-1356-6559 NR 19 TC 138 Z9 141 U1 0 U2 4 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0022-3654 J9 J PHYS CHEM-US JI J. Phys. Chem. PD SEP 19 PY 1991 VL 95 IS 19 BP 7138 EP 7142 DI 10.1021/j100172a011 PG 5 WC Chemistry, Physical SC Chemistry GA GG383 UT WOS:A1991GG38300011 ER PT J AU KAMAL, GD PFALLER, MA REMPE, LE JEBSON, PJR AF KAMAL, GD PFALLER, MA REMPE, LE JEBSON, PJR TI REDUCED INTRAVASCULAR INFECTION BY ANTIBIOTIC BONDING - REPLY SO JAMA-JOURNAL OF THE AMERICAN MEDICAL ASSOCIATION LA English DT Letter ID CATHETER-RELATED INFECTION C1 UNIV IOWA,COLL MED,IOWA CITY,IA 52242. RP KAMAL, GD (reprint author), USN HOSP,PORTSMOUTH,VA, USA. NR 2 TC 1 Z9 1 U1 0 U2 1 PU AMER MEDICAL ASSOC PI CHICAGO PA 515 N STATE ST, CHICAGO, IL 60610 SN 0098-7484 J9 JAMA-J AM MED ASSOC JI JAMA-J. Am. Med. Assoc. PD SEP 18 PY 1991 VL 266 IS 11 BP 1514 EP 1514 PG 1 WC Medicine, General & Internal SC General & Internal Medicine GA GE458 UT WOS:A1991GE45800030 ER PT J AU ROLAND, CM NGAI, KL AF ROLAND, CM NGAI, KL TI SEGMENTAL RELAXATION AND MOLECULAR-STRUCTURE IN POLYBUTADIENES AND POLYISOPRENE SO MACROMOLECULES LA English DT Article ID PRIMARY TRANSITION REGION; AMORPHOUS POLYMERS; MODEL; TEMPERATURE; BEHAVIOR AB The glass transition dispersion in the mechanical spectrum was measured for polybutadienes of various vinyl content and for polyisoprene. The breadths of spectra were found to parallel the concentration of pendant vinyl groups on the main chain. Consistent with results on many other materials, the shape of the spectra were well described by the Kohlrausch-Williams-Watts function; consequently, the segmental relaxation behavior can be specified by the dependence of the fractional exponent on molecular structure. It was determined that the spectral shapes correlate with the temperature dependence of the time-temperature shift factors. Specifically, segmental relaxations that are more intermolecularly cooperative exhibit larger shift factors, indicating a relationship between time and temperature dependencies. The spectral bandwidths were not associated with structural diversity within the polymer backbone. The behavior can be interpreted using the coupling model of relaxation. This model identifies the origin of the Kohlrausch form for the spectral dispersion and provides a plausible physical picture. The model's prediction of a correspondence between the spectral shape and the temperature dependence of the shift factors is corroborated. RP ROLAND, CM (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 42 TC 156 Z9 156 U1 1 U2 10 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0024-9297 J9 MACROMOLECULES JI Macromolecules PD SEP 16 PY 1991 VL 24 IS 19 BP 5315 EP 5319 DI 10.1021/ma00019a016 PG 5 WC Polymer Science SC Polymer Science GA GF730 UT WOS:A1991GF73000016 ER PT J AU DOSCHEK, GA AF DOSCHEK, GA TI HIGH-TEMPERATURE PLASMA IN SOLAR-FLARES SO PHILOSOPHICAL TRANSACTIONS OF THE ROYAL SOCIETY OF LONDON SERIES A-MATHEMATICAL PHYSICAL AND ENGINEERING SCIENCES LA English DT Article ID DIELECTRONIC SATELLITE SPECTRA; X-RAY-SPECTRA; HELIUM-LIKE IONS; ENERGY-DISTRIBUTIONS; LINES; IRON; RATIOS AB The thermal soft X-ray flare plasma is at temperatures ranging from a few million degrees up to about 40 x 10(6) K. In this paper I discuss some current problems in our understanding of the physical conditions in this plasma, particularly the ionization balance and the possible detection of non-thermal electrons. I discuss X-ray spectroscopic diagnostics that might help in resolving some of the issues, and I also discuss the possibility of addressing these problems with the bent crystal spectrometer experiment to be flown on Solar-A. RP DOSCHEK, GA (reprint author), USN,RES LAB,EO HULBURT CTR SPACE RES,WASHINGTON,DC 20375, USA. NR 22 TC 3 Z9 3 U1 0 U2 0 PU ROYAL SOC LONDON PI LONDON PA 6 CARLTON HOUSE TERRACE, LONDON, ENGLAND SW1Y 5AG J9 PHILOS T ROY SOC A JI Philos. Trans. R. Soc. Lond. Ser. A-Math. Phys. Eng. Sci. PD SEP 16 PY 1991 VL 336 IS 1643 BP 451 EP 460 DI 10.1098/rsta.1991.0094 PG 10 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA GG053 UT WOS:A1991GG05300012 ER PT J AU GAMMON, D SHANABROOK, BV KATZER, DS AF GAMMON, D SHANABROOK, BV KATZER, DS TI EXCITONS, PHONONS, AND INTERFACES IN GAAS/ALAS QUANTUM-WELL STRUCTURES SO PHYSICAL REVIEW LETTERS LA English DT Article ID NEAR-ATOMIC RESOLUTION; CONFINED LO PHONONS; SEMICONDUCTOR INTERFACES; SUPERLATTICES; DISPERSION AB We report photoluminescence and resonant-Raman-scattering studies of single GaAs/AlAs quantum-well structures. Splittings in the exciton peaks show that there is a large-scale island structure at the interfaces. Shifts in the absolute exciton energies of quantum wells grown at different substrate temperatures and also the form of the optical-phonon energies as a function of both mode index and quantum-well width indicate that there also exists a small-scale structure on the interfaces. RP GAMMON, D (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. RI Katzer, D. Scott/N-7841-2013 NR 14 TC 134 Z9 135 U1 2 U2 14 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 SEP 16 PY 1991 VL 67 IS 12 BP 1547 EP 1550 DI 10.1103/PhysRevLett.67.1547 PG 4 WC Physics, Multidisciplinary SC Physics GA GF296 UT WOS:A1991GF29600018 ER PT J AU ERWIN, SC PEDERSON, MR AF ERWIN, SC PEDERSON, MR TI ELECTRONIC-STRUCTURE OF CRYSTALLINE K6C60 SO PHYSICAL REVIEW LETTERS LA English DT Article AB First-principles electronic-structure calculations for crystalline K6C60 are reported, based on the geometry determined by x-ray-diffraction measurements. The ground state is found to be insulating, with an indirect gap of 0.48 eV. The character of both occupied and unoccupied states near the valence-band maximum is completely carbonlike. The K atoms are almost fully ionized, and the C60 molecule is stabilized in an unusually high charge state with six additional electrons. Implications of the distribution of excess charge on the C60 molecule for orientational ordering are discussed. 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 10 TC 112 Z9 113 U1 0 U2 7 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0031-9007 J9 PHYS REV LETT JI Phys. Rev. Lett. PD SEP 16 PY 1991 VL 67 IS 12 BP 1610 EP 1613 DI 10.1103/PhysRevLett.67.1610 PG 4 WC Physics, Multidisciplinary SC Physics GA GF296 UT WOS:A1991GF29600034 ER PT J AU GILARDI, R GEORGE, C FLIPPENANDERSON, JL ZAJAC, WW WALTERS, TR WOODS, JM AF GILARDI, R GEORGE, C FLIPPENANDERSON, JL ZAJAC, WW WALTERS, TR WOODS, JM TI STRUCTURE OF 1-AMINO-3,5,7-TRINITROADAMANTANE SO ACTA CRYSTALLOGRAPHICA SECTION C-CRYSTAL STRUCTURE COMMUNICATIONS LA English DT Article ID 1,3,5,7-TETRANITROADAMANTANE; OXIDATION AB C10H14N4O6, M(r) = 572.5, monoclinic, P2(1)/n, a = 14.089, b = 13.806 (3), c = 14.414 (3) angstrom, beta = 118.86 (2)-degrees, V = 2455.5 (9) angstrom 3, Z = 8, D(x) = 1.55 Mg m-3, lambda(Cu K-alpha) = 1.54184 angstrom, mu = 1.1 mm-1, F(000) = 1200, T = 295 K, final R = 0.058, wR = 0.065 for 2600 independent observed reflections. There are two molecules in the asymmetric unit which differ primarily in the relative orientation of the nitro groups to the adamantane cage. C1 VILLANOVA UNIV,DEPT CHEM,VILLANOVA,PA 19085. RP GILARDI, R (reprint author), USN,RES LAB,STRUCT MATTER LAB,WASHINGTON,DC 20375, USA. NR 8 TC 0 Z9 0 U1 0 U2 1 PU MUNKSGAARD INT PUBL LTD PI COPENHAGEN PA 35 NORRE SOGADE, PO BOX 2148, DK-1016 COPENHAGEN, DENMARK SN 0108-2701 J9 ACTA CRYSTALLOGR C JI Acta Crystallogr. Sect. C-Cryst. Struct. Commun. PD SEP 15 PY 1991 VL 47 BP 1914 EP 1916 DI 10.1107/S0108270191001853 PN 9 PG 3 WC Chemistry, Multidisciplinary; Crystallography SC Chemistry; Crystallography GA GH168 UT WOS:A1991GH16800047 ER PT J AU CHEN, PS FELD, GK DEMBITSKY, WP KRIETT, JM FLECK, RP BRENNAN, EJ HENJUM, SC AF CHEN, PS FELD, GK DEMBITSKY, WP KRIETT, JM FLECK, RP BRENNAN, EJ HENJUM, SC TI SUCCESSFUL RADIOFREQUENCY CATHETER ABLATION OF ACCESSORY PATHWAYS THAT RECURRED AFTER SURGERY SO AMERICAN JOURNAL OF CARDIOLOGY LA English DT Article ID ATRIOVENTRICULAR PATHWAY C1 UNIV CALIF SAN DIEGO,MED CTR,DEPT SURG,DIV CARDIOTHORAC SURG,SAN DIEGO,CA 92103. VET AFFAIRS MED CTR,SAN DIEGO,CA. USN,REG MED CTR,DEPT MED,DIV CARDIOL,SAN DIEGO,CA 92132. RP CHEN, PS (reprint author), UNIV CALIF SAN DIEGO,MED CTR,DEPT MED 8411,DIV CARDIOL,SAN DIEGO,CA 92103, USA. NR 6 TC 0 Z9 0 U1 0 U2 0 PU EXCERPTA MEDICA INC PI NEW YORK PA 245 WEST 17TH STREET, NEW YORK, NY 10011 SN 0002-9149 J9 AM J CARDIOL JI Am. J. Cardiol. PD SEP 15 PY 1991 VL 68 IS 8 BP 825 EP 827 DI 10.1016/0002-9149(91)90670-G PG 3 WC Cardiac & Cardiovascular Systems SC Cardiovascular System & Cardiology GA GE639 UT WOS:A1991GE63900031 PM 1892102 ER PT J AU MITSUDOMI, T STEINBERG, SM OIE, HK MULSHINE, JL PHELPS, R VIALLET, J PASS, H MINNA, JD GAZDAR, AF AF MITSUDOMI, T STEINBERG, SM OIE, HK MULSHINE, JL PHELPS, R VIALLET, J PASS, H MINNA, JD GAZDAR, AF TI RAS GENE-MUTATIONS IN NON-SMALL-CELL LUNG CANCERS ARE ASSOCIATED WITH SHORTENED SURVIVAL IRRESPECTIVE OF TREATMENT INTENT SO CANCER RESEARCH LA English DT Note ID ONCOGENE ACTIVATION; ADENOCARCINOMA; AMPLIFICATION; RESISTANCE AB We analyzed 66 non-small cell lung cancer cell lines for mutations at codons 12, 13, and 61 of all three ras genes and correlated the findings with patient survival. We used designed restriction fragment-length polymorphisms to detect mutations after amplification of ras-specific sequences by the polymerase chain reaction. We found 19 mutations of ras genes (29%), and 11 of these 19 (58%) were at codon 12 of the K-ras gene. By univariate analysis, the presence of any ras mutation in cell lines from patients who received curative intent treatment was associated with a shorter survival (P2 = 0.002). For patients who received only palliative treatment, detection of K-ras mutations at codon 12 was associated with a shortened survival (P2 = 0.0103), but this analysis was not statistically significant for the group with any ras mutation (P2 = 0.093). The Cox proportional hazards model also predicted a higher risk for patients with any type of ras mutations. We conclude that ras mutations, present in a subset of non-small cell lung cancers, are independently associated with the shortened survival of patients, irrespective of treatment intent. C1 NCI, USN, MED ONCOL BRANCH, BETHESDA, MD 20892 USA. NCI, SURG BRANCH, BETHESDA, MD 20892 USA. NCI, BIOSTAT & DATA MANAGEMENT SECT, BETHESDA, MD 20892 USA. NATL NAVAL MED CTR, BETHESDA, MD 20814 USA. OI Mitsudomi, Tetsuya/0000-0001-9860-8505 NR 27 TC 230 Z9 232 U1 0 U2 0 PU AMER ASSOC CANCER RESEARCH PI PHILADELPHIA PA 615 CHESTNUT ST, 17TH FLOOR, PHILADELPHIA, PA 19106-4404 USA SN 0008-5472 J9 CANCER RES JI Cancer Res. PD SEP 15 PY 1991 VL 51 IS 18 BP 4999 EP 5002 PG 4 WC Oncology SC Oncology GA GE303 UT WOS:A1991GE30300039 PM 1654209 ER PT J AU PAZIK, JC GEORGE, C BERRY, A AF PAZIK, JC GEORGE, C BERRY, A TI PRIMARY AND SECONDARY NEOPENTYL ARSINES AND THEIR REACTIONS WITH TRIMETHYLGALLIUM - CRYSTAL AND MOLECULAR-STRUCTURE OF [ME2GAAS(CH2CME3)2]2 SO INORGANICA CHIMICA ACTA LA English DT Article ID CHEMICAL VAPOR-DEPOSITION; MONOMERIC ARSINOGALLANE; GALLIUM-ARSENIDE; GAAS; GROWTH; TERTIARYBUTYLARSINE; SEMICONDUCTORS; PRECURSORS; COMPOUND AB The primary and secondary neopentylarsines, NpAsH2 and Np2AsH (Np = CH2CMe3) have been prepared from the reaction of the corresponding bromide (NpAsBr2 and Np2AsBr) with lithium aluminum hydride in ether or tetraglyme solution. Reaction of the primary or secondary arsine with GaMe3 yielded a colorless, crystalline arsino(gallane) with empirical formula Me2GaAs(H)Np or Me2GaAsNp2, respectively. The new compounds have been fully characterized according to elemental analysis, physical and solubility properties, IR, H-1 and C-13 NMR spectroscopies. Single crystal X-ray diffraction studies of Me2GaAsNp2 have shown the compound to be dimeric in the solid state. The compound [Me2GaAsNp2]2 crystallized in the triclinic space group P1BAR with unit cell parameters a = 8.688(4), b = 9.817(4), c = 9.910(4) angstrom, V = 774.7(6) angstrom3 and Z = 2. The planar (Ga-As)2 ring of the dimer lies on an inversion center with Ga-As bond lengths of 2.529(1) and 2.532(1) angstrom. The endocyclic angles at As and Ga are 94.3(1) and 85.7(1)-degrees, respectively. C1 USN,RES LAB,STRUCT MATTER LAB,WASHINGTON,DC 20375. USN,RES LAB,DIV CHEM,WASHINGTON,DC 20375. RP PAZIK, JC (reprint author), USN,RES LAB,DIV ELECTR SCI & TECHNOL,CODE 6861,WASHINGTON,DC 20375, USA. NR 31 TC 3 Z9 3 U1 0 U2 0 PU ELSEVIER SCIENCE SA LAUSANNE PI LAUSANNE 1 PA PO BOX 564, 1001 LAUSANNE 1, SWITZERLAND SN 0020-1693 J9 INORG CHIM ACTA JI Inorg. Chim. Acta PD SEP 15 PY 1991 VL 187 IS 2 BP 207 EP 215 DI 10.1016/S0020-1693(00)90396-7 PG 9 WC Chemistry, Inorganic & Nuclear SC Chemistry GA GR334 UT WOS:A1991GR33400015 ER PT J AU CARROLL, TL PECORA, LM RACHFORD, FJ AF CARROLL, TL PECORA, LM RACHFORD, FJ TI MAGNETOSTATIC MODES AND CHAOS IN YTTRIUM-IRON-GARNET FILMS SO JOURNAL OF APPLIED PHYSICS LA English DT Article ID STRANGE ATTRACTORS; PARAMETRIC-EXCITATION; TIME-SERIES; DIMENSION; SPHERE AB Nonlinear interactions in yttrium iron garnet cause complex, low-frequency signals seen during ferromagnetic-resonance experiments. Several methods from nonlinear dynamics have been used to measure quantities such as dimensions, Lyapunov exponents, and others, to characterize complex behavior that is measured by ferromagnetic resonance experiments. It is found that these quantities may be more useful in understanding the interactions in yttrium iron garnet than more commonly measured quantities such as oscillation frequency. Very simple numerical models are also used to suggest which quantities are most important in characterizing these spin-wave interactions. RP CARROLL, TL (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. OI Carroll, Thomas/0000-0002-2371-2049 NR 27 TC 6 Z9 6 U1 0 U2 0 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0021-8979 J9 J APPL PHYS JI J. Appl. Phys. PD SEP 15 PY 1991 VL 70 IS 6 BP 3197 EP 3208 DI 10.1063/1.349303 PG 12 WC Physics, Applied SC Physics GA GF539 UT WOS:A1991GF53900047 ER PT J AU PALIK, ED GLEMBOCKI, OJ HEARD, I BURNO, PS TENERZ, L AF PALIK, ED GLEMBOCKI, OJ HEARD, I BURNO, PS TENERZ, L TI ETCHING ROUGHNESS FOR (100) SILICON SURFACES IN AQUEOUS KOH SO JOURNAL OF APPLIED PHYSICS LA English DT Article ID INFRARED-SPECTROSCOPY; HYDROGEN TERMINATION; CRYSTALLINE SILICON; ALKALINE-SOLUTIONS; HF TREATMENT; FABRICATION; MORPHOLOGY; ELECTRODES; BEHAVIOR; SI(111) AB The quality of vertical roughness produced by the etching of Si in aqueous KOH has been studied by varying several experimental parameters such as molarity, time of etching, temperature, and stirring. We note that at room temperature, unstirred etching is smoother at low and high molarities, and etch rate and roughness both peak near 5-6 M. With no stirring, roughness increases as a function of etch time, then levels off. With stirring, roughness decreases, especially around the peak etch rate near 5-6 M. For a fixed molarity like 5 M, unstirred etching becomes smoother with increasing temperature even as the etch rate increases rapidly. Such results suggest that masking by hydrogen bubbles or silicate etch products is the principle origin of vertical roughness. Bubble properties as a function of molarity and stirring (as determined from electrolysis experiments) are used to suggest a pseudo-masking model to explain some roughness properties. C1 USN,RES LAB,WASHINGTON,DC 20375. LINCOLN UNIV,LINCOLN UNIVERSITY,PA 19352. UNIV UPPSALA,S-75121 UPPSALA,SWEDEN. NR 40 TC 110 Z9 111 U1 7 U2 43 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 SEP 15 PY 1991 VL 70 IS 6 BP 3291 EP 3300 DI 10.1063/1.349263 PG 10 WC Physics, Applied SC Physics GA GF539 UT WOS:A1991GF53900061 ER PT J AU KINDLE, JC AF KINDLE, JC TI TOPOGRAPHIC EFFECTS ON THE SEASONAL CIRCULATION OF THE INDIAN-OCEAN SO JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS LA English DT Article ID BOUNDARY CURRENTS EAST; FLORIDA STRAITS; GULF-STREAM; MODEL; TRANSPORT; VARIABILITY; MADAGASCAR; NORTH AB The relative effects of islands and topography on the seasonal circulation of the southern Indian Ocean are examined. The numerical simulations use a one-active layer reduced gravity model and a two-layer model with full bottom topography forced by the Hellerman and Rosenstein wind stress climatology. The reduced gravity experiments show that the absence of a seasonal cycle of transport off the north coast of Madagascar is not caused by the presence of islands to the east. The two-layer experiments indicate that the presence of abrupt topography associated with the Mascarene Ridge and the Providence Bank north of Madagascar decrease the annual barotropic signal of the North Madagascar Current and increase the seasonal variation of the Southeast Madagascar Current. Furthermore, the two-layer experiments predict the existence of a significant seasonal variation of transport north of the Saya de Malha Bank along the Mascarene Ridge; the signal (12-16 Sv in amplitude) is sufficiently large that the model results may be tested by future observations. Finally, the differences between the seasonal variation of the Indian and North Atlantic oceans are discussed. RP KINDLE, JC (reprint author), USN,OCEANOG & ATMOSPHER RES LAB,CODE 323,STENNIS SPACE CTR,MS 39529, USA. NR 24 TC 11 Z9 11 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-OCEANS JI J. Geophys. Res.-Oceans PD SEP 15 PY 1991 VL 96 IS C9 BP 16827 EP 16837 DI 10.1029/91JC01542 PG 11 WC Oceanography SC Oceanography GA GG239 UT WOS:A1991GG23900012 ER PT J AU RIEDLINGER, SH PRELLER, RH AF RIEDLINGER, SH PRELLER, RH TI THE DEVELOPMENT OF A COUPLED ICE-OCEAN MODEL FOR FORECASTING ICE CONDITIONS IN THE ARCTIC SO JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS LA English DT Article ID SEA ICE; NUMERICAL-SIMULATION; HEAT; LEADS AB A coupled ice-ocean model has been developed to investigate how a better simulation of ice-ocean interaction can improve sea ice forecasting capabilities. The coupling of the ice and ocean results in improved temporal variability of ocean circulation and heat and salt exchange between ice and ocean. The U.S. Navy's Polar Ice Prediction System is coupled to a diagnostic version of the Bryan-Cox three-dimensional ocean circulation model. A horizontal grid spacing of 127 km was used in the coupled model with 17 vertical levels from the surface to the ocean bottom. Atmospheric data from the Naval Operational Global Atmospheric Prediction System (NOGAPS) for 1986 were used to force the model. The ice-ocean model simulation yielded realistic ice thickness distributions, ice drifts, and ocean currents. The model predicted accurate seasonal trends in ice growth and decay. Excess ice is often grown in the Greenland and Barents seas in fall and winter. This is due, in part, to the model's grid resolution which does not accurately resolve narrow currents, such as the West Spitsbergen Current. A sensitivity study of the heat transfer coefficients used in the ice model showed that the ice edge could be improved by using different coefficient values for thick ice, thin ice, and open water. Other sensitivity studies examined the effect of removing the "distorted" physics frequently used in the Bryan-Cox ocean circulation model and the effect of the vertical eddy momentum coefficient on the surface ocean circulation. An additional simulation was made using 1989 NOGAPS forcing to examine what type of variability could occur when using different years of NOGAPS forcing in the diagnostic ocean model. Significant differences occurred between the 1989 and 1986 ice thickness distributions as well as the oceanic heat fluxes. These differences show that the forecast system, which presently uses an ocean "climatology," can benefit from the variability allowed by the diagnostic ocean model. RP RIEDLINGER, SH (reprint author), USN,OCEANOG & ATMOSPHER RES LAB,STENNIS SPACE CTR,MS 39529, USA. NR 22 TC 20 Z9 21 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-OCEANS JI J. Geophys. Res.-Oceans PD SEP 15 PY 1991 VL 96 IS C9 BP 16955 EP 16977 DI 10.1029/91JC01431 PG 23 WC Oceanography SC Oceanography GA GG239 UT WOS:A1991GG23900021 ER PT J AU VOHRA, ST BUCHOLTZ, F KERSEY, AD AF VOHRA, ST BUCHOLTZ, F KERSEY, AD TI FIBEROPTIC DC AND LOW-FREQUENCY ELECTRIC-FIELD SENSOR SO OPTICS LETTERS LA English DT Article ID FILM AB We demonstrate an interferometric fiber-optic dc and low-frequency electric-field sensor based on the electrostrictive effect. The quadratic relationship between the applied electric field E and the induced strain e in electrostrictive ceramics (e.g., Ba:PZT) allows for the detection of low-frequency signals as sidebands of a high-frequency carrier. A preliminary investigation of the sensor has yielded a minimum detectable E field of 0.35 (V/m)/square-root Hz at 5 Hz for a sensor with 3 cm of fiber. RP VOHRA, ST (reprint author), USN,RES LAB,DIV OPT SCI,WASHINGTON,DC 20375, USA. NR 10 TC 15 Z9 15 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 SEP 15 PY 1991 VL 16 IS 18 BP 1445 EP 1447 DI 10.1364/OL.16.001445 PG 3 WC Optics SC Optics GA GF631 UT WOS:A1991GF63100027 PM 19776997 ER PT J AU BENDLER, JT SHLESINGER, MF AF BENDLER, JT SHLESINGER, MF TI FRACTAL CLUSTERS IN THE LEARNING-CURVE SO PHYSICA A LA English DT Article AB From the scaling nature of the learning curve it is deduced that time-saving changes in productivity should occur in self-similar clusters. C1 OFF NAVAL RES,DIV PHYS,ARLINGTON,VA 22217. RP BENDLER, JT (reprint author), GE,CORP RES & DEV,POLYMER MAT LAB,SCHENECTADY,NY 12301, USA. NR 9 TC 3 Z9 3 U1 13 U2 14 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0378-4371 J9 PHYSICA A JI Physica A PD SEP 15 PY 1991 VL 177 IS 1-3 BP 585 EP 588 DI 10.1016/0378-4371(91)90204-P PG 4 WC Physics, Multidisciplinary SC Physics GA GJ927 UT WOS:A1991GJ92700079 ER PT J AU KAPETANAKOS, CA DIALETIS, D MARSH, SJ LEN, LK SMITH, T AF KAPETANAKOS, CA DIALETIS, D MARSH, SJ LEN, LK SMITH, T TI BEAM TRAPPING IN A MODIFIED BETATRON ACCELERATOR SO PHYSICAL REVIEW A LA English DT Article ID RING AB The experimental results on the trapping of the beam in the Naval Research Laboratory modified betatron accelerator are in good agreement with a revised model of resistive trapping, and thus it may be concluded that the wall resistivity is responsible for the inward spiral motion of the beam after injection. C1 SCI APPLICAT INT CORP,MCLEAN,VA 22102. SACHS FREEMAN ASSOCIATES INC,LANDOVER,MD 20785. FM TECHNOL INC,FAIRFAX,VA 22032. RP KAPETANAKOS, CA (reprint author), USN,RES LAB,DIV PLASMA PHYS,WASHINGTON,DC 20375, 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 1050-2947 J9 PHYS REV A JI Phys. Rev. A PD SEP 15 PY 1991 VL 44 IS 6 BP 3900 EP 3907 DI 10.1103/PhysRevA.44.3900 PG 8 WC Optics; Physics, Atomic, Molecular & Chemical SC Optics; Physics GA GH320 UT WOS:A1991GH32000063 ER PT J AU ESAREY, E JOYCE, G SPRANGLE, P AF ESAREY, E JOYCE, G SPRANGLE, P TI FREQUENCY UP-SHIFTING OF LASER-PULSES BY COPROPAGATING IONIZATION FRONTS SO PHYSICAL REVIEW A LA English DT Article ID PHOTON ACCELERATOR; PLASMA-WAVES; AMPLIFICATION; GENERATION AB A method for up-shifting the frequency of a subpicosecond laser pulse that utilizes the interaction of the pulse with a co-propagating relativistic ionization front is examined. The induced frequency shift is found to initially scale linearly with the propagation time tau. Asymptotically, the frequency scales as tau-1/2. Phase-slippage limitations may be overcome by appropriately increasing the plasma density as a function of tau, thus allowing for substantially higher-frequency shifts. RP ESAREY, E (reprint author), USN,RES LAB,DIV PLASMA PHYS,BEAM PHYS BRANCH,WASHINGTON,DC 20375, USA. NR 25 TC 73 Z9 74 U1 0 U2 2 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1050-2947 J9 PHYS REV A JI Phys. Rev. A PD SEP 15 PY 1991 VL 44 IS 6 BP 3908 EP 3911 DI 10.1103/PhysRevA.44.3908 PG 4 WC Optics; Physics, Atomic, Molecular & Chemical SC Optics; Physics GA GH320 UT WOS:A1991GH32000064 ER PT J AU OVERFELT, PL AF OVERFELT, PL TI BESSEL-GAUSS PULSES SO PHYSICAL REVIEW A LA English DT Article ID WAVE-EQUATION; MODES; BEAMS AB A family of exact pulse solutions of the homogenous free-space scalar wave equation is obtained. These solutions describe moving modified Bessel-Gauss pulses. They include the fundamental Gaussian pulse and the Bessel beam solutions as special cases. The zeroth-order Bessel-Gauss pulse is shown to be more highly localized than the fundamental Gaussian solution because of its extra spectral degree of freedom. A superposition of Bessel-Gauss pulses is used to create a splash pulse that is more localized than the Ziolkowski splash pulse. RP OVERFELT, PL (reprint author), USN,CTR WEAP,RES DEPT,DIV PHYS,CHINA LAKE,CA 93555, USA. NR 12 TC 64 Z9 68 U1 0 U2 9 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 SEP 15 PY 1991 VL 44 IS 6 BP 3941 EP 3947 DI 10.1103/PhysRevA.44.3941 PG 7 WC Optics; Physics, Atomic, Molecular & Chemical SC Optics; Physics GA GH320 UT WOS:A1991GH32000068 ER PT J AU BOULDIN, CE FORMAN, RA BELL, MI DONOVAN, EP AF BOULDIN, CE FORMAN, RA BELL, MI DONOVAN, EP TI STRUCTURAL RELAXATION IN ION-DAMAGED AMORPHOUS-GERMANIUM SO PHYSICAL REVIEW B LA English DT Article ID ABSORPTION FINE-STRUCTURE; ELECTRON-YIELD; SILICON; EXAFS; GE AB X-ray and optical studies of ion-damaged amorphous germanium reveal a structural relaxation produced by low-temperature (200-degrees-C) annealing. This relaxation appears to be qualitatively different from that observed previously at higher annealing temperatures (250-500-degrees-C). Extended x-ray-absorption fine-structure measurements, made in the total-electron-yield mode with a sampling depth of 600-800 angstrom, indicate a sharpening of the first shell in the radial distribution, but no change in the first-shell distance or coordination number. No higher shells in the radial distribution are observed, before or after annealing, indicating that these shells remain highly disordered. Infrared-reflection and Raman-scattering measurements confirm that a relaxation takes place and that there is no nucleation of microcrystals in the implanted layer within the detection limit of 1.5% volume fraction. In contrast to previous studies, the present results exhibit no evidence of a reduction in bond-angle disorder. C1 USN,RES LAB,DIV CONDENSED MATTER & RADIAT SCI,WASHINGTON,DC 20375. RP BOULDIN, CE (reprint author), NATL INST STAND & TECHNOL,DIV SEMICOND ELECTR,GAITHERSBURG,MD 20899, USA. NR 20 TC 10 Z9 10 U1 3 U2 6 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1098-0121 J9 PHYS REV B JI Phys. Rev. B PD SEP 15 PY 1991 VL 44 IS 11 BP 5492 EP 5496 DI 10.1103/PhysRevB.44.5492 PG 5 WC Physics, Condensed Matter SC Physics GA GF443 UT WOS:A1991GF44300013 ER PT J AU SHIH, A HOR, C ELAM, W KIRKLAND, J MUELLER, D AF SHIH, A HOR, C ELAM, W KIRKLAND, J MUELLER, D TI SURFACE GEOMETRY OF BAO ON W(100) - A SURFACE-EXTENDED X-RAY-ABSORPTION FINE-STRUCTURE STUDY SO PHYSICAL REVIEW B LA English DT Article ID SYNCHROTRON RADIATION; ELECTRONIC-PROPERTIES; W(001); PHASE; SPECTROSCOPY; AMPLITUDE AB A surface-extended x-ray-absorption fine-structure study of ordered monolayers of coadsorbed barium and oxygen on a single-crystal W(100) surface is described. A (square-root 2 X square-root 2)R45-degrees structure with a stoichiometric barium-to-oxygen ratio, and a (2 square-root 2 X square-root 2)R45-degrees structure with a nearly 1:2 barium-to-oxygen atomic ratio both form on W(100). The surface-extended x-ray-absorption fine-structure results indicate that all the barium and oxygen atoms are nearly coplanar in the (square-root 2 X square-root 2)R 45-degrees overlayer. The Ba-to-O distance in this overlayer is 3.20 +/- 0.05 angstrom and beta = 82-degrees +/- 5-degrees, where beta is the angle between the Ba-O internuclear axis and the surface normal. For the (2 square-root 2 X square-root 2)R 45-degrees overlayer, there are two types of oxygen sites. Oxygen atoms nearly coplanar with the barium atoms are also present in these films with a Ba-to-O distance of 3.27 +/- 0.05 angstrom and beta = 75 +/- 4-degrees. Additional oxygen atoms lie outside the barium plane at a distance 2.03 +/- 0.05 angstrom and beta = 23 +/- 10-degrees from the nearest barium atoms. C1 BROOKHAVEN NATL LAB,NATL SYNCHROTRON LIGHT SOURCE,UPTON,NY 11973. NATL INST STAND & TECHNOL,GAITHERSBURG,MD 20899. RP SHIH, A (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 27 TC 10 Z9 10 U1 0 U2 3 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1098-0121 J9 PHYS REV B JI Phys. Rev. B PD SEP 15 PY 1991 VL 44 IS 11 BP 5818 EP 5826 DI 10.1103/PhysRevB.44.5818 PG 9 WC Physics, Condensed Matter SC Physics GA GF443 UT WOS:A1991GF44300057 ER PT J AU KUMAR, S BHADRA, R FARTASH, A GRIMSDITCH, M KIM, C QADRI, SB EDELSTEIN, AS AF KUMAR, S BHADRA, R FARTASH, A GRIMSDITCH, M KIM, C QADRI, SB EDELSTEIN, AS TI BRILLOUIN-SCATTERING FROM ION-BEAM-SPUTTERED CU/NI SUPERLATTICES SO PHYSICAL REVIEW B LA English DT Note ID SURFACE ACOUSTIC-WAVES; METALLIC SUPERLATTICES; SUPER-LATTICES; FILMS; FOILS; PHONONS AB In order to study the effect of fabrication technique on elastic properties of the superlattices, we have investigated a series of ion-beam-sputtered Cu/Ni superlattices and compared the results with those previously reported on evaporated samples. No systematic differences were observed in the relative intensities of the x-ray peaks from samples fabricated by the two techniques. The Brillouin-scattering results show no modulation-wavelength dependence. C1 USN,RES LAB,WASHINGTON,DC 20375. RP KUMAR, S (reprint author), ARGONNE NATL LAB,DIV MAT SCI,ARGONNE,IL 60439, USA. NR 19 TC 16 Z9 16 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1098-0121 J9 PHYS REV B JI Phys. Rev. B PD SEP 15 PY 1991 VL 44 IS 11 BP 5905 EP 5907 DI 10.1103/PhysRevB.44.5905 PG 3 WC Physics, Condensed Matter SC Physics GA GF443 UT WOS:A1991GF44300070 ER PT J AU ALERHAND, OL WANG, J JOANNOPOULOS, JD KAXIRAS, E BECKER, RS AF ALERHAND, OL WANG, J JOANNOPOULOS, JD KAXIRAS, E BECKER, RS TI ADSORPTION OF AS ON STEPPED SI(100) - RESOLUTION OF THE SUBLATTICE-ORIENTATION DILEMMA SO PHYSICAL REVIEW B LA English DT Note ID MOLECULAR-BEAM EPITAXY; GAAS; SURFACES; SI; SI(001); HETEROEPITAXY; MICROSCOPY; INTERFACE; SILICON; GROWTH AB First-principles calculations are used to investigate the energetics of an As overlayer adsorbed on a stepped Si(100) surface. We show that the growth of As directly on top of the Si surface produces a metastable structure, while the replacement of the original top Si layer by As leads to a lower-energy configuration. In the latter case, the rearrangement of the surface is driven by the relaxation of stress by surface steps. This result explains the sublattice-orientation dilemma in GaAs-on-Si heteroepitaxy. C1 MIT,DEPT PHYS,CAMBRIDGE,MA 02139. USN,RES LAB,COMPLEX SYST THEORY BRANCH,WASHINGTON,DC 20375. AT&T BELL LABS,MURRAY HILL,NJ 07974. SACHS FREEMAN ASSOCIATES INC,LANDOVER,MD 20785. RP ALERHAND, OL (reprint author), BELLCORE,RED BANK,NJ 07701, USA. RI Schaff, William/B-5839-2009 NR 29 TC 36 Z9 36 U1 0 U2 1 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1098-0121 J9 PHYS REV B JI Phys. Rev. B PD SEP 15 PY 1991 VL 44 IS 12 BP 6534 EP 6537 DI 10.1103/PhysRevB.44.6534 PG 4 WC Physics, Condensed Matter SC Physics GA GH553 UT WOS:A1991GH55300063 ER PT J AU CHEN, JL WANG, CS JACKSON, KA PEDERSON, MR AF CHEN, JL WANG, CS JACKSON, KA PEDERSON, MR TI THEORY OF MAGNETIC AND STRUCTURAL ORDERING IN IRON CLUSTERS SO PHYSICAL REVIEW B LA English DT Note ID LOCAL-SPIN-DENSITY; ELECTRONIC-STRUCTURE; TOTAL-ENERGY; DIMERS; APPROXIMATION; BCC AB The structural properties of neutral iron clusters Fe(n) (n less-than-or-equal-to 4) are investigated using a first-principles, all-electron, linear-combination-of-Gaussian-orbitals method. The ground states are all ferromagnetic with highest-dimensional geometry. They exhibit a tendency toward enhanced bond length, narrower d-band widths, and maximum pairs of nearest-neighbor bonds. Such conditions are favorable for maximizing the energy gain for ferromagnetism, thereby stabilizing the ground-state geometry. C1 GEORGE MASON UNIV,DEPT PHYS,FAIRFAX,VA 22030. USN,RES LAB,COMPLEX SYST THEORY BRANCH,WASHINGTON,DC 20375. RP CHEN, JL (reprint author), UNIV MARYLAND,DEPT PHYS & ASTRON,COLLEGE PK,MD 20742, USA. OI Jackson, Koblar/0000-0002-5342-7978 NR 27 TC 95 Z9 98 U1 1 U2 5 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1098-0121 J9 PHYS REV B JI Phys. Rev. B PD SEP 15 PY 1991 VL 44 IS 12 BP 6558 EP 6561 DI 10.1103/PhysRevB.44.6558 PG 4 WC Physics, Condensed Matter SC Physics GA GH553 UT WOS:A1991GH55300069 ER PT J AU SCHEPS, R AF SCHEPS, R TI EFFICIENT CR,ND-GD3SC2GA3O12 LASER AT 1.06-MU-M PUMPED BY VISIBLE GAINP/ALGAINP LASER-DIODES SO APPLIED PHYSICS LETTERS LA English DT Article ID ND LASERS; GARNET; ND-3+ AB The 1.06-mu-m Nd transition in co-doped Cr,Nd:Gd3Sc2Ga3O12 (Cr,Nd:GSGG) is obtained by diode pumping Cr3+ at 670 nm and is shown to produce efficient, low-threshold laser operation. Both cw and long-pulse diode pumping were demonstrated, with pump power levels as high as 300 mW cw and 1 W pulsed. The lowest threshold power measured was 938-mu-W, and the highest output power obtained was 43 mW cw and 173 mW pulsed. The best slope efficiency obtained was 42.1%, 78% of the theoretical maximum. Loss measurements indicate a value of 0.4% cm-1. RP SCHEPS, R (reprint author), USN,CTR OCEAN SYST,CODE 843,SAN DIEGO,CA 92152, USA. NR 16 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 SEP 9 PY 1991 VL 59 IS 11 BP 1287 EP 1289 DI 10.1063/1.105477 PG 3 WC Physics, Applied SC Physics GA GD982 UT WOS:A1991GD98200007 ER PT J AU SHANABROOK, BV KATZER, DS WAGNER, RJ AF SHANABROOK, BV KATZER, DS WAGNER, RJ TI INSITU DETERMINATION OF FLUX NONUNIFORMITIES DURING MOLECULAR-BEAM EPITAXIAL-GROWTH SO APPLIED PHYSICS LETTERS LA English DT Article ID QUANTUM-WELL STRUCTURES; PARAMETERS AB We have observed an amplitude modulation superimposed on growth induced reflection high energy electron diffraction (RHEED) oscillations in molecular beam epitaxial growth of GaAs, AlSb, and GaSb. An analysis of spatially resolved luminescence measurements from a single GaAs/Al0.3Ga0.7As quantum well and RHEED oscillation data verifies an earlier suggestion of Van Hove and co-workers that this modulation is related to nonuniform group III fluxes at the substrate. This phenomenon is very useful because it allows a quantitative in situ determination of group III flux nonuniformity. Furthermore, this study indicates that theories relating the decay of the RHEED oscillations to growth induced roughening of the surface should account for modifications that arise in the apparent decay rate because of flux nonuniformities. RP SHANABROOK, BV (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. RI Katzer, D. Scott/N-7841-2013 NR 9 TC 3 Z9 3 U1 0 U2 1 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0003-6951 J9 APPL PHYS LETT JI Appl. Phys. Lett. PD SEP 9 PY 1991 VL 59 IS 11 BP 1317 EP 1319 DI 10.1063/1.105486 PG 3 WC Physics, Applied SC Physics GA GD982 UT WOS:A1991GD98200017 ER PT J AU DOBISZ, EA FATEMI, M DIETRICH, HB MCCORMICK, AW HARBISON, JP AF DOBISZ, EA FATEMI, M DIETRICH, HB MCCORMICK, AW HARBISON, JP TI IMPLANTATION DAMAGE IN GAAS-ALAS SUPERLATTICES OF DIFFERENT LAYER THICKNESS SO APPLIED PHYSICS LETTERS LA English DT Article ID ION-IMPLANTATION; SILICON IMPLANTATION; SI AB We report that two GaAs-AlAs superlattices of different layer thickness show dramatically different crystal damage when ion irradiated under identical conditions. The samples, held at 77 K, were implanted with 100 keV Si-28 at doses of 3 X 10(13) cm-2 to 1 X 10(15) cm-2. Ion channeling results show amorphization threshold doses of 1 X 10(15) cm-2 for the 7.0 nm GaAs-8.5 nm AlAs superlattice and 4 X 10(14) cm-2 for the 3.5 nm GaAs-5.0 nm AlAs superlattice. At low doses, the shorter period superlattice was more robust, with no damage peak observed in ion channeling spectra for doses as high as 1 X 10(14) cm-2. For a dose of 7 X 10(13) cm-2, double crystal x-ray diffraction measurements show a 6 arcsec broadening of the (004) peak, relative to that of the unimplanted sample, for both superlattices. However, only the finer period superlattice exhibits a broadening (10 arcsec) of the (224) diffracted peak indicating a distortion in an additional direction. A mechanism involving the formation of slightly misaligned crystal domains is suggested to describe the behavior of the finer period superlattice. C1 UNIVERSAL ENERGY SYST,DAYTON,OH 45432. RP DOBISZ, EA (reprint author), USN,RES LAB,DIV ELECTR SCI & TECHNOL,WASHINGTON,DC 20375, USA. NR 18 TC 4 Z9 4 U1 2 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 SEP 9 PY 1991 VL 59 IS 11 BP 1338 EP 1340 DI 10.1063/1.105493 PG 3 WC Physics, Applied SC Physics GA GD982 UT WOS:A1991GD98200024 ER PT J AU YU, HY SANDAY, SC AF YU, HY SANDAY, SC TI ELASTIC FIELDS IN JOINED HALF-SPACES DUE TO NUCLEI OF STRAIN SO PROCEEDINGS OF THE ROYAL SOCIETY OF LONDON SERIES A-MATHEMATICAL PHYSICAL AND ENGINEERING SCIENCES LA English DT Article ID MEDIA AB The Galerkin vector stress functions are obtained for the complete set of 40 physically significant nuclei of strain in two joined elastic half-spaces of different elastic properties as an extension of the solutions for the nuclei of strain in the half-space. Two types of boundary condition at the planar interface are considered: perfect bonding and frictionless contact. Simplified expressions for the Galerkin vectors are introduced which reduce the complexity of the expressions for the displacements and stresses in the half-space and the two-material problems. The solutions are obtained by simply solving a set of linear simultaneous algebraic equations to find the strengths of the image and fictitious nuclei of strain which make the resultant elastic field satisfy the boundary conditions and show the proper singularity. RP YU, HY (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 12 TC 53 Z9 53 U1 0 U2 2 PU ROYAL SOC LONDON PI LONDON PA 6 CARLTON HOUSE TERRACE, LONDON, ENGLAND SW1Y 5AG SN 1364-5021 J9 P ROY SOC LOND A MAT JI Proc. R. Soc. London Ser. A-Math. Phys. Eng. Sci. PD SEP 9 PY 1991 VL 434 IS 1892 BP 503 EP 519 DI 10.1098/rspa.1991.0110 PG 17 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA GF004 UT WOS:A1991GF00400002 ER PT J AU YU, HY SANDAY, SC AF YU, HY SANDAY, SC TI ELASTIC FIELD IN JOINED SEMI-INFINITE SOLIDS WITH AN INCLUSION SO PROCEEDINGS OF THE ROYAL SOCIETY OF LONDON SERIES A-MATHEMATICAL PHYSICAL AND ENGINEERING SCIENCES LA English DT Article AB A general method is presented to obtain the elastic field in two joined semi-infinite isotropic solids due to an inclusion of any shape which undergoes a spontaneous change of shape and is located anywhere within one of the semi-infinite solids. The inclusions change of shape is such that, were the surrounding material absent, it would result from some prescribed stress free transformation strain (eigenstrain). The two semi-infinite solids can be either perfectly bonded or in frictionless contact at the planar interface. Examples are given for the inclusion with eigenstrains of practical interest. For the case where the inclusion is an ellipsoid and the given eigenstrain is uniform, the solution can be expressed in terms of well-known elliptic integrals. It is shown that existing solutions for the ellipsoidal inclusion in a semi-infinite solid are special cases of the present general solution. RP YU, HY (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 23 TC 34 Z9 34 U1 0 U2 1 PU ROYAL SOC LONDON PI LONDON PA 6 CARLTON HOUSE TERRACE, LONDON, ENGLAND SW1Y 5AG SN 1364-5021 J9 P ROY SOC LOND A MAT JI Proc. R. Soc. London Ser. A-Math. Phys. Eng. Sci. PD SEP 9 PY 1991 VL 434 IS 1892 BP 521 EP 530 DI 10.1098/rspa.1991.0111 PG 10 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA GF004 UT WOS:A1991GF00400003 ER PT J AU SKELTON, EF AYERS, JD QADRI, SB MOULTON, NE COOPER, KP FINGER, LW MAO, HK HU, Z AF SKELTON, EF AYERS, JD QADRI, SB MOULTON, NE COOPER, KP FINGER, LW MAO, HK HU, Z TI SYNCHROTRON X-RAY-DIFFRACTION FROM A MICROSCOPIC SINGLE-CRYSTAL UNDER PRESSURE SO SCIENCE LA English DT Article ID MICROCRYSTAL AB Metallic filaments with submicrometer diameters have been fabricated. Standard diffraction techniques with conventional x-ray sources were unsuccessful in identifying the structure of these materials. However, with the use of synchrotron radiation produced on a wiggler beam line, diffraction data were obtained in measurement periods as short as 10 milliseconds. Two cylindrical single crystals of bismuth were studied, each with a diameter of 0.22 +/- 0.02 micrometer. The volume of sample illuminated for these measurements was 0.38 cubic micrometer, less than 0.5 femtoliter. The crystals are grown in glass capillaries, and because bismuth expands on solidification, they are under a residual hoop stress. The crystallographic data indicate the presence of a linear compressive strain of about 2 percent, which is assumed to be the result of a residual stress of about 2 gigapascals. C1 USN,RES LAB,DIV MAT SCI & TECHNOL,WASHINGTON,DC 20375. CARNEGIE INST WASHINGTON,NATL SCI FDN,CTR SCI & TECHNOL,CTR HIGH PRESSURE RES,WASHINGTON,DC 20015. CARNEGIE INST WASHINGTON,NATL SCI FDN,CTR SCI & TECHNOL,GEOPHYS LAB,WASHINGTON,DC 20015. RP SKELTON, EF (reprint author), USN,RES LAB,DIV CONDENSED MATTER & RADIAT SCI,WASHINGTON,DC 20375, USA. NR 9 TC 20 Z9 20 U1 0 U2 6 PU AMER ASSOC ADVANCEMENT SCIENCE PI WASHINGTON PA 1200 NEW YORK AVE, NW, WASHINGTON, DC 20005 SN 0036-8075 J9 SCIENCE JI Science PD SEP 6 PY 1991 VL 253 IS 5024 BP 1123 EP 1125 DI 10.1126/science.253.5024.1123 PG 3 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA GD808 UT WOS:A1991GD80800027 PM 17731809 ER PT J AU HARTMANN, B SIMHA, R BERGER, AE AF HARTMANN, B SIMHA, R BERGER, AE TI PVT SCALING PARAMETERS FOR POLYMER MELTS .2. ERROR IN ALL VARIABLES SO JOURNAL OF APPLIED POLYMER SCIENCE LA English DT Article ID PRESSURE-VOLUME-TEMPERATURE; AMORPHOUS POLYMERS; EQUATION; STATE; LIQUIDS; POLY(DIMETHYLSILOXANE); ETHYLENE; BEHAVIOR AB An algorithm is discussed for determining best-fit scaling parameters in the PVT equation of state of polymer melts from experimental data. The underlying theoretical expressions are those employed in our preceding work. There it was assumed that values of pressure and temperature are known exactly and experimental uncertainty was admitted in the volume solely. This condition is now relaxed to allow for errors in P and T also. The methodology developed involves multiple small nonlinear fitting problems for two or three unknowns at a time. We employ it on the experimental data base in the earlier work, which consists of 11 polymer melts. To these is added ethylene monomer, analyzed earlier by Nies et al. by different methods. The numerical values of the scaling parameters differ by at most a fraction of a percent from those in the earlier computations and enhance the accuracy of fit but slightly. The significant improvement over the consecutive procedure (analysis of atmospheric pressure isobar, followed by isotherms at elevated pressures), seen earlier, continues therefore. The scaling parameters so obtained should represent the ultimate in computational accuracy consistent with a specified experimental accuracy. This may have a bearing ultimately on the issue of modeling molecular characteristics, expressed through the scaling parameters, versus macroscopic properties. Using the parameters determined here, it is shown that the entropy is correlated with the scaling temperature and that the flexibility parameter is related to polymer complexity. RP USN, CTR SURFACE WARFARE, SILVER SPRING, MD 20903 USA. NR 23 TC 21 Z9 21 U1 0 U2 1 PU WILEY-BLACKWELL PI HOBOKEN PA 111 RIVER ST, HOBOKEN 07030-5774, NJ USA SN 0021-8995 EI 1097-4628 J9 J APPL POLYM SCI JI J. Appl. Polym. Sci. PD SEP 5 PY 1991 VL 43 IS 5 BP 983 EP 991 DI 10.1002/app.1991.070430516 PG 9 WC Polymer Science SC Polymer Science GA GB228 UT WOS:A1991GB22800016 ER PT J AU MAZZOLA, MS ROUSH, RA STOUDT, DC GRIFFITHS, SF AF MAZZOLA, MS ROUSH, RA STOUDT, DC GRIFFITHS, SF TI ANALYSIS OF NONOHMIC CURRENT-VOLTAGE CHARACTERISTICS IN A CU-COMPENSATED GAAS PHOTOCONDUCTOR SO APPLIED PHYSICS LETTERS LA English DT Article ID SWITCHES; CONTACTS AB An analysis of observations of nonohmic current conduction in a copper-compensated GaAs (GaAs:Cu) photoconductive switch is presented. It is demonstrated that conduction during illumination and at modest current densities can be attributed to an optically injected plasma influenced by single-injection contact effects. However, at higher current densities, a double-injection model is more suitable. We provide further evidence that the transition from a single-injection process to a double-injection process is accompanied by the formation of at least one current filament with cross-sectional area of 5 X 10(-4) cm2, and a peak current density greater than 10(3) A/cm2 . We finish by suggesting avalanche breakdown at the n+ - i anode junction as a possible mechanism for the onset of significant hole injection at the anode, a condition necessary to justify the use of a double-injection-dominated transport model in an essentially n-i-n device. RP MAZZOLA, MS (reprint author), USN,CTR SURFACE WEAP,PULSED POWER TECHNOL BRANCH,CODE F45,DAHLGREN,VA 22448, 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 0003-6951 J9 APPL PHYS LETT JI Appl. Phys. Lett. PD SEP 2 PY 1991 VL 59 IS 10 BP 1182 EP 1184 DI 10.1063/1.105496 PG 3 WC Physics, Applied SC Physics GA GC958 UT WOS:A1991GC95800015 ER PT J AU BADAKHSHAN, A GLOSSER, R LAMBERT, S ANTHONY, M SILLMON, RS THOMPSON, PE ALAVI, K AF BADAKHSHAN, A GLOSSER, R LAMBERT, S ANTHONY, M SILLMON, RS THOMPSON, PE ALAVI, K TI CARRIER CONCENTRATION DETERMINATION BY PHOTOREFLECTANCE AT E1 IN THIN-FILM, HIGHLY DOPED GAAS SO APPLIED PHYSICS LETTERS LA English DT Article ID MODULATION SPECTROSCOPY; OPTICAL-PROPERTIES; ELECTROREFLECTANCE; DEPENDENCE AB Photoreflectance (PR) response at the E1 (2.9 eV) transition of GaAs doped with Si, Zn, and Be was investigated within the range of 1.5 X 10(15) to 2 X 10(19) cm-3. Growth technique was either metalorganic chemical vapor deposition (MOCVD) or molecular beam epitaxy (MBE). We find that GAMMA-1, the broadening parameter of the E1 structure increases linearly with the logarithm of the measured carrier concentration over the range of almost-equal-to 1 X 10(17) to almost-equal-to 1 X 10(19) cm-3. A slope of 56 +/- 5 meV/decade describes all Si:GaAs samples independent of growth technique. For p-GaAs, the slope is 30 +/- 3 meV/decade over a comparable range and is independent of doping element as well as growth technique. This linear relation could be employed as a contactless means of determining carrier concentration. The energy position of E1 shows no significant shift in the above range. We believe that the broadening is a result of the doping produced, electric field within the depletion region. C1 UNIV TEXAS,CTR APPL OPT,RICHARDSON,TX 75083. UNIV TEXAS,PHYS PROGRAMS,RICHARDSON,TX 75083. VARO INC,IMO,DIV ELECTROOPT SYST,ADV MAT GRP,GARLAND,TX 75042. TEXAS INSTRUMENTS INC,CENT RES LAB,DALLAS,TX 75265. USN,RES LAB,WASHINGTON,DC 20375. UNIV TEXAS,CTR ADV ELECTRON DEVICES & SYST,ARLINGTON,TX 76019. NR 21 TC 13 Z9 13 U1 1 U2 4 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0003-6951 J9 APPL PHYS LETT JI Appl. Phys. Lett. PD SEP 2 PY 1991 VL 59 IS 10 BP 1218 EP 1220 DI 10.1063/1.105508 PG 3 WC Physics, Applied SC Physics GA GC958 UT WOS:A1991GC95800027 ER PT J AU CAMPBELL, PM SNOW, ES MOORE, WJ GLEMBOCKI, OJ KIRCHOEFER, SW AF CAMPBELL, PM SNOW, ES MOORE, WJ GLEMBOCKI, OJ KIRCHOEFER, SW TI LIGHT-ACTIVATED TELEGRAPH NOISE IN ALGAAS TUNNEL BARRIERS - OPTICAL PROBING OF A SINGLE DEFECT SO PHYSICAL REVIEW LETTERS LA English DT Article ID STATES; DIODES; ENERGY; GAAS AB We observe light-activated switching between discrete resistance states in GaAs/AlGaAs single-barrier tunnel structures. This switching is caused by a change in charge state of a single hole trap which modulates the current through a small region of low barrier height generated by a crystalline dislocation propagating through the barrier. Each switching event corresponds to the capture or subsequent release of a single photogenerated hole. We are therefore able to probe this single charge trap by optically inducing changes in the occupancy of its charge states. RP CAMPBELL, PM (reprint author), USN,RES LAB,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 SEP 2 PY 1991 VL 67 IS 10 BP 1330 EP 1333 DI 10.1103/PhysRevLett.67.1330 PG 4 WC Physics, Multidisciplinary SC Physics GA GC957 UT WOS:A1991GC95700039 ER PT J AU KARLE, J AF KARLE, J TI SOME ADDITIONAL FEATURES OF ONE-WAVELENGTH ANOMALOUS DISPERSION SO ACTA CRYSTALLOGRAPHICA SECTION A LA English DT Article ID TRIPLET PHASE INVARIANTS; ISOMORPHOUS REPLACEMENT AB By use of appropriate algebraic formulas, illustrations are given of several characteristics of one-wavelength anomalous-dispersion data, for the case that one predominant type of anomalous-scattering atom is present. It is shown that, when the structure of the anomalous scatterer is known, some simple algebraic formulas may be used to generate initial values of many phases associated with a macromolecular structure. In some cases, there may be enough phases determined to permit further refinement and extension by use of current techniques for doing so. Another calculation shows the virtue of including isomorphous-replacement data and how readily that is done in an algebraic system. It is also shown that there is an advantage in accuracy through the use of a particular statistical calculation of the magnitude of the structure factors for the anomalous scatterers, even when the magnitudes are known accurately because the structure of the anomalous scatterers is known. This occurs because the statistical values are scaled to adjust to errors in the data and thus avoids a disparity in scale that would occur otherwise in the algebraic system. With highly accurate data, the advantage would disappear. It is also shown, however, that, even with accurate one-wavelength anomalous-dispersion data, the coupling of isomorphous-replacement data leads to greater accuracy in evaluating phase differences than coupling with known magnitudes for the structure factors associated with the anomalous scatterers. Finally, there is a discussion of the use of known and statistically estimated values of the structure-factor magnitudes that correspond to the total structure in which all atoms (including the anomalous scatterers) scatter as if they were all scattering normally. RP KARLE, J (reprint author), USN,RES LAB,STRUCT MATTER LAB,WASHINGTON,DC 20375, USA. FU NIGMS NIH HHS [GM 30902] NR 13 TC 1 Z9 1 U1 0 U2 0 PU MUNKSGAARD INT PUBL LTD PI COPENHAGEN PA 35 NORRE SOGADE, PO BOX 2148, DK-1016 COPENHAGEN, DENMARK SN 0108-7673 J9 ACTA CRYSTALLOGR A JI Acta Crystallogr. Sect. A PD SEP 1 PY 1991 VL 47 BP 537 EP 543 DI 10.1107/S0108767391003914 PN 5 PG 7 WC Chemistry, Multidisciplinary; Crystallography SC Chemistry; Crystallography GA GH170 UT WOS:A1991GH17000013 PM 1659427 ER PT J AU LEHNERT, W SUNDHEIM, B AF LEHNERT, W SUNDHEIM, B TI A PERFORMANCE EVALUATION OF TEXT-ANALYSIS TECHNOLOGIES SO AI MAGAZINE LA English DT Article AB A performance evaluation of 15 text-analysis systems was recently conducted to realistically assess the state of the art for detailed information extraction from unconstrained continuous text. Reports associated with terrorism were chosen as the target domain, and all systems were tested on a collection of previously unseen texts released by a government agency. Based on multiple strategies for computing each metric, the competing systems were evaluated for recall, precision, and overgeneration. The results support the claim that systems incorporating natural language-processing techniques are more effective than systems based on stochastic techniques alone. A wide range of language-processing strategies was employed by the top-scoring systems, indicating that many natural language-processing techniques provide a viable foundation for sophisticated text analysis. Further evaluation is needed to produce a more detailed assessment of the relative merits of specific technologies and establish true performance limits for automated information extraction. C1 USN,CTR OCEAN SYST,DECIS SUPPORT & ARTIFICIAL INTELLIGENCE TECHNOL BRANCH,SAN DIEGO,CA 92152. RP LEHNERT, W (reprint author), UNIV MASSACHUSETTS,COMP SCI,AMHERST,MA 01003, USA. NR 2 TC 38 Z9 39 U1 0 U2 0 PU AMER ASSOC ARTIFICIAL INTELL PI MENLO PK PA 445 BURGESS DRIVE, MENLO PK, CA 94025-3496 SN 0738-4602 J9 AI MAG JI AI Mag. PD FAL PY 1991 VL 12 IS 3 BP 81 EP 94 PG 14 WC Computer Science, Artificial Intelligence SC Computer Science GA GG138 UT WOS:A1991GG13800007 ER PT J AU GRINSTEIN, FF BORIS, JP GRIFFIN, OM AF GRINSTEIN, FF BORIS, JP GRIFFIN, OM TI PASSIVE PRESSURE-DRAG CONTROL IN A PLANE WAKE SO AIAA JOURNAL LA English DT Article; Proceedings Paper CT 28TH MEETING ON AEROSPACE SCIENCES CY JAN 08-11, 1990 CL RENO, NV SP AMER INST AERONAUT & ASTRONAUT ID SPATIALLY DEVELOPING FLOWS; CIRCULAR-CYLINDER; INSTABILITIES; ABSOLUTE AB We report results of a study of the transition region of a compressible (subsonic) plane wake at moderately high Reynolds numbers, based on the numerical solution of the inviscid time-dependent flow equations. The focus is placed on the flow dynamics in the region of vortex formation and the near wake. A thin interference plate along the wake centerline, which can either be attached or detached from the bluff-body base, is used as a means for passive pressure-drag control by affecting the vortex formation process directly. The results show that the inclusion of an interference plate in the flow configuration can significantly decrease the magnitude of the base pressure coefficient by factors of up to 3, depending on the length of the plate and its separation from the base. The calculated results are in good agreement with the available experimental data and include the detached case for which little or no data exists. The observed self-sustained (global) instabilities in the present simulations were found to be intrinsic features of the flows investigated and are consistent with the local absolute/global instability picture currently favored. RP GRINSTEIN, FF (reprint author), USN,RES LAB,CTR ADV SPACE SENSING,COMPUTAT PHYS & FLUID DYNAM LAB,WASHINGTON,DC 20375, USA. NR 20 TC 8 Z9 8 U1 0 U2 0 PU AMER INST AERONAUT ASTRONAUT PI RESTON PA 1801 ALEXANDER BELL DRIVE, STE 500, RESTON, VA 22091 SN 0001-1452 J9 AIAA J JI AIAA J. PD SEP PY 1991 VL 29 IS 9 BP 1436 EP 1442 DI 10.2514/3.10757 PG 7 WC Engineering, Aerospace SC Engineering GA GD700 UT WOS:A1991GD70000013 ER PT J AU SARPKAYA, T AF SARPKAYA, T TI CALCULATION OF ASYMMETRIC VORTEX SEPARATION ON CONES AND TANGENT OGIVES BASED ON A DISCRETE VORTEX MODEL - COMMENT SO AIAA JOURNAL LA English DT Note ID INVISCID MODEL RP SARPKAYA, T (reprint author), NAVAL POST GRAD SCH,MECH ENGN,MONTEREY,CA 93943, USA. NR 9 TC 0 Z9 0 U1 0 U2 0 PU AMER INST AERONAUT ASTRONAUT PI RESTON PA 1801 ALEXANDER BELL DRIVE, STE 500, RESTON, VA 22091 SN 0001-1452 J9 AIAA J JI AIAA J. PD SEP PY 1991 VL 29 IS 9 BP 1535 EP 1536 DI 10.2514/3.59967 PG 2 WC Engineering, Aerospace SC Engineering GA GD700 UT WOS:A1991GD70000030 ER PT J AU APPLEBY, DF AF APPLEBY, DF TI ANGLO-SAXON CRUCIFIXION ICONOGRAPHY AND THE ART OF THE MONASTIC REVIVAL - RAW,BC SO ALBION LA English DT Book Review RP APPLEBY, DF (reprint author), USN ACAD, ANNAPOLIS, MD 21402 USA. NR 1 TC 0 Z9 0 U1 0 U2 0 PU APPALACHIAN STATE UNIV PI BOONE PA ALBION/HISTORY DEPT 210 WHITENER HALL, BOONE, NC 28608 USA SN 0095-1390 J9 ALBION JI Albion PD FAL PY 1991 VL 23 IS 3 BP 510 EP 512 PG 3 WC History SC History GA GZ195 UT WOS:A1991GZ19500009 ER PT J AU APPLEBY, DF AF APPLEBY, DF TI SAINTS AND RELICS IN ANGLO-SAXON ENGLAND - ROLLASON,D SO ALBION LA English DT Book Review RP APPLEBY, DF (reprint author), USN ACAD, ANNAPOLIS, MD 21402 USA. NR 1 TC 0 Z9 0 U1 0 U2 0 PU APPALACHIAN STATE UNIV PI BOONE PA ALBION/HISTORY DEPT 210 WHITENER HALL, BOONE, NC 28608 USA SN 0095-1390 J9 ALBION JI Albion PD FAL PY 1991 VL 23 IS 3 BP 510 EP 512 PG 3 WC History SC History GA GZ195 UT WOS:A1991GZ19500008 ER PT J AU CUNNINGHAM, DS EVANS, EE AF CUNNINGHAM, DS EVANS, EE TI THE EFFECTS OF BETAMETHASONE ON MATERNAL CELLULAR-RESISTANCE TO INFECTION SO AMERICAN JOURNAL OF OBSTETRICS AND GYNECOLOGY LA English DT Article DE FETAL LUNG MATURITY; PRETERM LABOR; CORTICOSTEROIDS; MATERNAL IMMUNITY ID RESPIRATORY-DISTRESS SYNDROME; FETAL LUNG MATURATION; PRETERM BIRTH; CORTICOSTEROIDS; PREVENTION; MONOCYTES; DELIVERY AB Antenatal administration of glucocorticoids is often used to facilitate fetal lung maturation in cases of prematurity; however, the effects of betamethasone on maternal immune function have not been established. Therefore maternal immune function was assessed with the use of in vitro techniques. Transient and incomplete suppression of the proliferative response to the T-cell mitogen phytohemagglutinin was demonstrated as early as 24 hours after administration of betamethasone. The magnitude and duration of suppression showed a corresponding increase with advancing gestational age, but these effects were not cumulative and were always short-lived (< 72 hours). No such suppression of the B-cell mitogen lipopolysaccharide was detected. The nonspecific cellular resistance to infection of maternal monocytes was determined through coincubation with the facultative intracellular pathogen Listeria monocytogenes. Increased phagocytic activity with a normal bactericidal effect was measured in the cell preparations obtained from recipients versus nonrecipients of betamethasone. Taken together, these findings clearly show that both specific and nonspecific immune function are intact in the preterm gravid woman after administration of betamethasone and should allay concerns over its use for reasons of infection control alone. RP CUNNINGHAM, DS (reprint author), USN HOSP,DEPT OBSTET & GYNECOL,PORTSMOUTH,VA 23708, USA. NR 21 TC 13 Z9 13 U1 0 U2 0 PU MOSBY-YEAR BOOK INC PI ST LOUIS PA 11830 WESTLINE INDUSTRIAL DR, ST LOUIS, MO 63146-3318 SN 0002-9378 J9 AM J OBSTET GYNECOL JI Am. J. Obstet. Gynecol. PD SEP PY 1991 VL 165 IS 3 BP 610 EP 615 PG 6 WC Obstetrics & Gynecology SC Obstetrics & Gynecology GA GG136 UT WOS:A1991GG13600022 PM 1892186 ER PT J AU LINENGER, JM CHESSON, CV NICE, DS AF LINENGER, JM CHESSON, CV NICE, DS TI PHYSICAL-FITNESS GAINS FOLLOWING SIMPLE ENVIRONMENTAL-CHANGE SO AMERICAN JOURNAL OF PREVENTIVE MEDICINE LA English DT Article AB Inactivity is the risk factor with potentially the greatest public health impact, according to the 1989 U.S. Preventive Services Task Force report. Our study reports changes in subjects' physical fitness level after simple changes aimed at enabling community members to adopt more easily active lifestyles. Simple environmental and social alterations occurred at a San Diego Naval air station. We administered to a cohort of active-duty personnel from within this community (n = 1,609) both a physical readiness test (PRT) and a lifestyle questionnaire at baseline and at one year. The PRT consisted of a 1.5-mile timed run, sit-ups, push-ups, and percentage body fat components, and the questionnaire addressed demographics, current exercise behavior, and attitudes toward exercise. We took similar measures within a comparison community cohort (n = 217) and within a Navy-wide sample cohort (n = 546). Both overall PRT category and 1.5-mile run time improved significantly (P < .05) over time in the intervention community (0.3 category points and 18 seconds, respectively). The increase was significantly greater (P < .01) than in either the control community or the Navy-wide sample. Subgroup analysis showed that, in the intervention community, 12.4% failed the overall fitness test in 1987, but only 5.1% failed in 1988. Similarly, the 1.5-mile run failures decreased from 8.4% to 4%. Reported leisure time kilocalorie expenditure showed no significant improvement. This simple program successfully improved fitness performance. The improvement was distributed throughout the community and included those who were substandard at baseline. Similar programs could easily be adopted in a variety of communities. RP LINENGER, JM (reprint author), USN,HLTH RES CTR,POB 85122,CODE 60,SAN DIEGO,CA 92186, USA. NR 0 TC 51 Z9 52 U1 0 U2 9 PU OXFORD UNIV PRESS INC PI CARY PA JOURNALS DEPT, 2001 EVANS RD, CARY, NC 27513 SN 0749-3797 J9 AM J PREV MED JI Am. J. Prev. Med. PD SEP-OCT PY 1991 VL 7 IS 5 BP 298 EP 310 PG 13 WC Public, Environmental & Occupational Health; Medicine, General & Internal SC Public, Environmental & Occupational Health; General & Internal Medicine GA HH029 UT WOS:A1991HH02900008 PM 1790036 ER PT J AU DORCHAK, JD BARRACK, RL KNEISL, JS ALEXANDER, AH AF DORCHAK, JD BARRACK, RL KNEISL, JS ALEXANDER, AH TI ARTHROSCOPIC TREATMENT OF SYMPTOMATIC SYNOVIAL PLICA OF THE KNEE - LONG-TERM FOLLOW-UP SO AMERICAN JOURNAL OF SPORTS MEDICINE LA English DT Article AB We studied all patients undergoing arthroscopic resection of symptomatic plica without other intraarticular abnormality at our institution from October 1981 to March 1987. To be considered abnormal, plicae had to be thickened and/or fibrotic when viewed arthroscopically. Seventy-six of nearly 2000 patients (4%) who underwent diagnostic arthroscopies met our inclusion criteria. Clinical response after arthroscopic resection was evaluated in 51 patients at an average of 47 months (range, 15 to 77). Excellent or good results were obtained in 57 (75%) of the patients. Eleven patients (14%) had an impingement lesion defined as a localized femoral condylar ridge or groove of the articular surface that impinged upon the plica with increasing flexion. All of these patients had an excellent or good result. Other factors associated with a favorable outcome included a specific preoperative diagnosis localizing symptoms to the medial compartment, onset of pain after a period of increased athletic activity or after a twisting injury, and younger age. Poor prognostic factors included associated chondromalacia and an unclear preoperative diagnosis. C1 USN HOSP,DEPT ORTHOPAED SURG,OAKLAND,CA 94627. NR 0 TC 40 Z9 40 U1 0 U2 1 PU AMER ORTHOPAEDIC SOC SPORT MED PI WALTHAM PA 230 CALVARY STREET, WALTHAM, MA 02154 SN 0363-5465 J9 AM J SPORT MED JI Am. J. Sports Med. PD SEP-OCT PY 1991 VL 19 IS 5 BP 503 EP 507 DI 10.1177/036354659101900515 PG 5 WC Orthopedics; Sport Sciences SC Orthopedics; Sport Sciences GA GG868 UT WOS:A1991GG86800015 PM 1962718 ER PT J AU COLETTA, PE AF COLETTA, PE TI NAVAL LESSONS OF THE GREAT-WAR - THE SIMS,WILLIAM DANIELS,JOSEPHUS CONTROVERSY SO AMERICAN NEPTUNE LA English DT Article RP COLETTA, PE (reprint author), USN ACAD,ANNAPOLIS,MD 21402, USA. NR 20 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 FAL PY 1991 VL 51 IS 4 BP 241 EP 251 PG 11 WC History SC History GA HA854 UT WOS:A1991HA85400002 ER PT J AU ROLISON, DR OGRADY, WE AF ROLISON, DR OGRADY, WE TI OBSERVATION OF ELEMENTAL ANOMALIES AT THE SURFACE OF PALLADIUM AFTER ELECTROCHEMICAL LOADING OF DEUTERIUM OR HYDROGEN SO ANALYTICAL CHEMISTRY LA English DT Article ID SEGREGATION THEORY; SOLID-SOLUTIONS; DIFFUSION; PLATINUM; RHODIUM; ALLOYS; TESTS AB In this work, the results from surface-sensitive analyses are reported for Pd after electrolysis of light water and heavy water. Pd foils used to electrolyze D2O or H2O (with LI2SO4 electrolyte and using the electrode configuration of Pons and Fleischmann) show a near-surface enrichment of Rh and Ag as detected by X-ray photoelectron spectroscopy (XPS). Rh and Ag are present as impurities in the starting Pd material but at levels (50 and 100 ppm, respectively) well below the XPS detection limit. The surface concentration of Rh increases as a function of total accumulated electrolytic charge and reaches a maximum of approximately 4 atom % relative to Pd. It is demonstrated that Rh and Ag are not electrodeposited at the Pd surface but rather must derive from the palladium itself. This phenomenon is most likely due to surface segregation of the Rh and Ag impurities under the forcing (current and time) conditions of the long-term (1-4 week) electrolyses as palladium deuteride or palladium hydride forms. An estimated segregation energy (DELTA-G) of 17 kJ/mol for Rh and 11 kJ/mol for Ag is obtained, derived from a chemical potential-driving force resulting from changes in the palladium matrix as the deuteride (hydride) phase forms. RP ROLISON, DR (reprint author), USN,RES LAB,SURFACE CHEM BRANCH,CODE 6170,WASHINGTON,DC 20375, USA. NR 26 TC 5 Z9 5 U1 1 U2 3 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0003-2700 J9 ANAL CHEM JI Anal. Chem. PD SEP 1 PY 1991 VL 63 IS 17 BP 1697 EP 1702 DI 10.1021/ac00017a009 PG 6 WC Chemistry, Analytical SC Chemistry GA GC931 UT WOS:A1991GC93100010 ER PT J AU GRATE, JW KLUSTY, M AF GRATE, JW KLUSTY, M TI SURFACE ACOUSTIC-WAVE VAPOR SENSORS BASED ON RESONATOR DEVICES SO ANALYTICAL CHEMISTRY LA English DT Article ID LANGMUIR-BLODGETT FILMS; PATTERN-RECOGNITION; CHEMICAL-ANALYSIS; RESPONSES; OSCILLATORS AB Surface acoustic wave (SAW) devices fabricated in the resonator configuration have been utilized as organic vapor sensors and compared with delay line devices more commonly used. The experimentally determined mass sensitivities of 200-, 300-, and 400-MHz resonators and 158-MHz delay lines coated with Langmuir-Blodgett (LB) films of poly(vinyl tetradecanal) are in excellent agreement with theoretical predictions. The responses of LB- and spray-coated sensors to various organic vapors were determined, and scaling laws for mass sensitivities, vapor sensitivities, and detection limits are discussed. The 200-MHz resonators provide the lowest noise levels and detection limits of all the devices examined. RP GRATE, JW (reprint author), USN,RES LAB,DIV CHEM,WASHINGTON,DC 20375, USA. NR 36 TC 95 Z9 99 U1 1 U2 10 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0003-2700 J9 ANAL CHEM JI Anal. Chem. PD SEP 1 PY 1991 VL 63 IS 17 BP 1719 EP 1727 DI 10.1021/ac00017a013 PG 9 WC Chemistry, Analytical SC Chemistry GA GC931 UT WOS:A1991GC93100014 ER PT J AU FLEMING, B AF FLEMING, B TI AT THE ARMY-NAVY POETRY PLAY-OFFS SO ANTIOCH REVIEW LA English DT Article RP FLEMING, B (reprint author), USN ACAD,ANNAPOLIS,MD 21402, USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU ANTIOCH REVIEW PI YELLOW SPRINGS PA BOX 148, YELLOW SPRINGS, OH 45387 SN 0003-5769 J9 ANTIOCH REV JI Antioch Rev. PD FAL PY 1991 VL 49 IS 4 BP 485 EP 496 PG 12 WC Literary Reviews SC Literature GA GU873 UT WOS:A1991GU87300001 ER PT J AU JEWELL, JM ASKINS, C AGGARWAL, ID AF JEWELL, JM ASKINS, C AGGARWAL, ID TI INTERFEROMETRIC METHOD FOR CONCURRENT MEASUREMENT OF THERMOOPTIC AND THERMAL-EXPANSION COEFFICIENTS SO APPLIED OPTICS LA English DT Article AB A Fabry-Perot-type interferometer is described that permits the concurrent measurement of the coefficient of thermal expansion (alpha) and the thermooptic coefficient (dn/dT) of transparent materials. Measurements of the alpha and the dn/dT of vitreous silica and a heavy-metal fluoride glass show that the technique is accurate, reproducible, and easily performed. In addition, the technique is used to show that the dn/dT of heavy-metal fluoride glasses is negative and temperature dependent. The magnitude of dn/dT is found to increase with increasing temperature. RP JEWELL, JM (reprint author), USN,RES LAB,OPT MAT RES GRP,WASHINGTON,DC 20375, USA. NR 17 TC 37 Z9 38 U1 0 U2 19 PU OPTICAL SOC AMER PI WASHINGTON PA 2010 MASSACHUSETTS AVE NW, WASHINGTON, DC 20036 SN 0003-6935 J9 APPL OPTICS JI Appl. Optics PD SEP 1 PY 1991 VL 30 IS 25 BP 3656 EP 3660 PG 5 WC Optics SC Optics GA GE641 UT WOS:A1991GE64100018 PM 20706441 ER PT J AU ANTIOCHOS, SK KLIMCHUK, JA AF ANTIOCHOS, SK KLIMCHUK, JA TI A MODEL FOR THE FORMATION OF SOLAR PROMINENCES SO ASTROPHYSICAL JOURNAL LA English DT Article DE HYDROMAGNETICS; SUN, PROMINENCES ID QUIESCENT PROMINENCES; CORONAL LOOPS AB We propose a model for the formation of prominence condensations in hot coronal loops. Previous studies have concentrated on cooling the hot plasma by decreasing the coronal heating rate. The difficulty with such models is that when the heating decreases, most of the loop mass is lost by draining onto the chromosphere. We argue that a prominence condensation is likely to be due to an increase in the heating. The key idea of our model is that the heating increase is spatially dependent so that it is localized nearer to the chromospheric footpoints than to the loop midpoint. We present results of numerical simulations of hot loops that are initially heated uniformly, and then undergo heating increases that are concentrated away from the loop midpoint. The temperature at the midpoint first increases, but eventually it collapses to chromospheric values as a result of chromospheric evaporation. Hence, we obtain the curious result that increasing the heating causes cooling. The resulting densities and time scales agree well with observations. The implications of this model for coronal heating and prominence structure are discussed. C1 STANFORD UNIV, CTR SPACE SCI & ASTROPHYS, STANFORD, CA 94305 USA. RP USN, RES LAB, EO HULBURT CTR SPACE RES, CODE 4171A, WASHINGTON, DC 20375 USA. RI Klimchuk, James/D-1041-2012; Antiochos, Spiro/D-4668-2012 OI Klimchuk, James/0000-0003-2255-0305; Antiochos, Spiro/0000-0003-0176-4312 NR 22 TC 90 Z9 90 U1 0 U2 0 PU IOP PUBLISHING LTD PI BRISTOL PA TEMPLE CIRCUS, TEMPLE WAY, BRISTOL BS1 6BE, ENGLAND SN 0004-637X EI 1538-4357 J9 ASTROPHYS J JI Astrophys. J. PD SEP 1 PY 1991 VL 378 IS 1 BP 372 EP 377 DI 10.1086/170437 PN 1 PG 6 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA GC363 UT WOS:A1991GC36300038 ER PT J AU CHANG, LW AF CHANG, LW TI A MIMO SLIDING CONTROL WITH A 1ST-ORDER PLUS INTEGRAL SLIDING CONDITION SO AUTOMATICA LA English DT Note DE ROBUST CONTROL; SLIDING CONTROL; NONLINEAR SYSTEMS; MULTIVARIABLE CONTROL SYSTEMS; LYAPUNOV METHODS ID UNCERTAIN DYNAMICAL-SYSTEMS; NON-LINEAR SYSTEMS; ULTIMATE BOUNDEDNESS; ROBOT MANIPULATORS AB A straight sliding control for nonlinear time-varying MIMO (multiple-input-multiple-output) systems is developed in which matrix norm techniques are utilized to tune the controlling parameters. The sliding control provides a straight tuning procedure to obtain the desired system response. A first-order plus integral s dynamics is derived from a first-order plus integral sliding condition. The integral in the s dynamics gurantees zero steady-state value of s and therefore zero steady-state error is warranted. The equivalent spring constant and the thickness of the boundary layer enable the separate control of the robustness to unmodeled dynamics and the tracking accuracy. To reject high-frequency unmodeled dynamics, the bandwidth of the s dynamics is limited by tuning the equivalent spring constant. The thickness of the boundary layer is adjusted within the sliding condition to fine tune the s dynamics and reduce the tracking error. RP CHANG, LW (reprint author), USN,POSTGRAD SCH,DEPT MECH ENGN,MONTEREY,CA 93943, USA. NR 18 TC 9 Z9 9 U1 0 U2 0 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0005-1098 J9 AUTOMATICA JI Automatica PD SEP PY 1991 VL 27 IS 5 BP 853 EP 858 DI 10.1016/0005-1098(91)90040-9 PG 6 WC Automation & Control Systems; Engineering, Electrical & Electronic SC Automation & Control Systems; Engineering GA GF339 UT WOS:A1991GF33900010 ER PT J AU TEMME, LA STILL, DL AF TEMME, LA STILL, DL TI PRESCRIPTIVE EYEGLASS USE BY UNITED-STATES-NAVY JET PILOTS - EFFECTS ON AIR-TO-AIR TARGET DETECTION SO AVIATION SPACE AND ENVIRONMENTAL MEDICINE LA English DT Article AB Air-to-air target detection distances, age, career jet flight hours, and total career flight hours were obtained for 167 U.S. Navy fighter pilots participating in air combat maneuver training at Naval Air Station, Oceana, VA. Of the pilots sampled, 22 used a prescribed spectacle correction while flying; 145 did not. We compared the air-to-air target detection distances between the two groups of pilots, those with corrective glasses and those without. Sunglasses and tinted filters were not factors in the present study. The results strongly suggest that, as a group, the pilots without glasses were able to detect targets at a greater distance than the pilots with glasses. When the pilots were matched on the basis of age and flight experience, the difference in air-to-air target detection capabilities of the two groups increased. The pilots without glasses were able to detect their adversary at a distance more than 20% farther than the pilots with glasses. RP TEMME, LA (reprint author), USN,AEROSP MED RES LAB,RES DEPT,NAVAL AIR STN,PENSACOLA,FL 32508, USA. NR 11 TC 6 Z9 6 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 SEP PY 1991 VL 62 IS 9 BP 823 EP 826 PG 4 WC Public, Environmental & Occupational Health; Medicine, General & Internal; Sport Sciences SC Public, Environmental & Occupational Health; General & Internal Medicine; Sport Sciences GA GC826 UT WOS:A1991GC82600001 PM 1930068 ER PT J AU NICOD, P GILPIN, EA DITTRICH, H HENNING, H MAISEL, A BLACKY, AR SMITH, SC RICOU, F ROSS, J AF NICOD, P GILPIN, EA DITTRICH, H HENNING, H MAISEL, A BLACKY, AR SMITH, SC RICOU, F ROSS, J TI TRENDS IN USE OF CORONARY ANGIOGRAPHY IN SUBACUTE PHASE OF MYOCARDIAL-INFARCTION SO CIRCULATION LA English DT Article DE MYOCARDIAL INFARCTION; CORONARY ANGIOGRAPHY ID EXERCISE TESTING SOON; MEDICALLY TREATED PATIENTS; ARTERY DISEASE; PROGNOSTIC VALUE; RISK STRATIFICATION; RADIONUCLIDE VENTRICULOGRAPHY; EJECTION FRACTION; RANDOMIZED TRIAL; BYPASS-SURGERY; LATE MORTALITY AB Background. Most patients do not undergo acute reperfusion after myocardial infarction, and which of these patients should undergo coronary angiography is still debated. Methods and Results. We analyzed the 1-year clinical outcomes and rates of coronary angiography performed as late as 60 days after myocardial infarction in 3,804 patients admitted between 1979 and 1988 and followed in six different centers. Patients less than 75 years old were classified into low-, medium-, and high-risk groups using a multivariate analysis of historical and clinical variables gathered during the first 8 hospital days. Patients who underwent early reperfusion (17%, all after 1984) were analyzed separately. To analyze time trends, patients were compared before and after mid-1984. Mortalities from day 9 through 1 year were similar for the two time periods in the low- (3.3% versus 2.5%) and medium-risk (7.4% versus 5.6%) groups, but mortality was lower for the high-risk group after 1984 (31.6% versus 20.0%). The proportion of patients undergoing coronary angiography increased dramatically in each group after 1984 (low risk, 18% versus 48%; medium risk, 23% versus 49%; high risk, 10% versus 32%, before and after 1984, respectively). Furthermore, a large percentage of patients (more than 40%) in the low-risk group did not have at least one of the indications for coronary angiography recently recommended by a joint task force. Among patients undergoing coronary angiography, the proportion of patients with three-vessel coronary artery disease decreased after 1984, whereas the proportion undergoing mechanical revascularization in the year after infarction increased in all risk groups. Conclusions. Despite the recent development of noninvasive techniques with high sensitivity for detecting high-risk patients after myocardial infarction, coronary angiography is being performed increasingly in all patients, including those determined to be at low risk for complications based on clinical data. The economic consequences of such a trend could be considerable, and its impact requires careful analysis. C1 UNIV CALIF SAN DIEGO,DIV CARDIOL,LA JOLLA,CA 92093. VET ADM MED CTR,SAN DIEGO,CA. USN HOSP,SAN DIEGO,CA 92134. UNIV BRITISH COLUMBIA,DIV CARDIOVASC STUDIES,VANCOUVER V6T 1W5,BC,CANADA. SHARP MEM HOSP & REHABIL CTR,SAN DIEGO,CA. HOP CANTONAL GENEVA,CH-1211 GENEVA 4,SWITZERLAND. FU NHLBI NIH HHS [HL-17682] NR 50 TC 34 Z9 35 U1 0 U2 0 PU AMER HEART ASSOC PI DALLAS PA 7272 GREENVILLE AVENUE, DALLAS, TX 75231-4596 SN 0009-7322 J9 CIRCULATION JI Circulation PD SEP PY 1991 VL 84 IS 3 BP 1004 EP 1015 PG 12 WC Cardiac & Cardiovascular Systems; Peripheral Vascular Disease SC Cardiovascular System & Cardiology GA GF184 UT WOS:A1991GF18400003 PM 1884437 ER PT J AU GOTO, M ZELLER, WP HURLEY, RM JONG, JS LEE, CH AF GOTO, M ZELLER, WP HURLEY, RM JONG, JS LEE, CH TI PROPHYLAXIS AND TREATMENT OF NEWBORN ENDOTOXIC-SHOCK WITH ANTI-LIPID-A MONOCLONAL-ANTIBODIES SO CIRCULATORY SHOCK LA English DT Article DE RAT; LIPOPOLYSACCHARIDE; IGG; IGM; LIPID-A ID CROSS-REACTIVITY; BACTERIAL LIPOPOLYSACCHARIDE; SEPTIC SHOCK; SPECIFICITY; RAT; IMMUNOTHERAPY; PROTECTION; THERAPY AB The newborn is very susceptible to gram-negative sepsis/septic shock. The mortality of newborn endotoxic shock continues to be high. Since lipid A is responsible for the toxic effects of lipopolysaccharide, anti-lipid A antibodies may prevent endotoxic shock in the newborn. This study showed that both anti-lipid A monoclonal IgG (A78S1) and anti-lipid A monoclonal IgM (A523) decreased the mortality of endotoxic shock in 10 day old rats. Prophylactic administration of A78S1 and A523 to the pregnant rat decreased the mortality of endotoxic shock in their 0-day-old offspring. Prophylaxis was due to transplacental passage of A78S1 treatment. The mechanism of prophylaxis remains unclear in A523 treatment. C1 LOYOLA UNIV,STRITCH SCH MED,DEPT PEDIAT,2160 S 1ST AVE,MAYWOOD,IL 60153. LOYOLA UNIV,STRITCH SCH MED,DEPT PHYSIOL,MAYWOOD,IL 60153. USN,MED RES INST,BETHESDA,MD 20814. FU NHLBI NIH HHS [HL31163] NR 35 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 0092-6213 J9 CIRC SHOCK JI Circ. Shock PD SEP PY 1991 VL 35 IS 1 BP 60 EP 64 PG 5 WC Cardiac & Cardiovascular Systems SC Cardiovascular System & Cardiology GA GF686 UT WOS:A1991GF68600009 PM 1742861 ER PT J AU LUQI AF LUQI TI COMPUTER-AIDED SOFTWARE PROTOTYPING SO COMPUTER LA English DT Editorial Material RP LUQI (reprint author), USN,POSTGRAD SCH,MONTEREY,CA 93943, USA. NR 0 TC 0 Z9 0 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 SEP PY 1991 VL 24 IS 9 BP 111 EP 112 PG 2 WC Computer Science, Hardware & Architecture; Computer Science, Software Engineering SC Computer Science GA GD913 UT WOS:A1991GD91300022 ER PT J AU GUTH, KJ HA, TT AF GUTH, KJ HA, TT TI ADAPTIVE STOP-AND-WAIT ARQ STRATEGY FOR MOBILE DATA COMMUNICATIONS SO COMPUTER COMMUNICATIONS LA English DT Article DE DATA COMMUNICATIONS; MOBILE COMMUNICATION; ARQ TECHNIQUES; STOP-AND-WAIT PROTOCOLS; RADIO FREQUENCY SYSTEMS AB Automatic Repeat reQuest (ARQ) techniques are often used by packet switching data communication networks to provide an error-free communications link between stations. The ARQ technique ensures consistent data quality under varying link conditions. Unfortunately, the information throughput is link dependent, and as the noise or interference on the link increases, the throughput decreases. In an effort to improve the throughput on a short range, RF, packet switching data communications network, an adaptive ARQ strategy applied to Stop-and-Wait (SW) protocols was developed. To provide a system designer with flexibility, different adaptive strategies for different systems and link conditions were developed. Examples of information transfer between two stations using the adaptive SW protocol are presented. A simulation to compute the throughput efficiency of several adaptive SW protocols was performed. A comparison of the throughput efficiencies of the simulated adaptive SW protocol with the non-adaptive SW protocol showed good gains could be achieved using the adaptive strategy when the networks are subject to high channel bit error rates. RP GUTH, KJ (reprint author), USN,POSTGRAD SCH,DEPT ELECT & COMP ENGN,MONTEREY,CA 93943, USA. NR 6 TC 0 Z9 0 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0140-3664 J9 COMPUT COMMUN JI Comput. Commun. PD SEP PY 1991 VL 14 IS 7 BP 405 EP 412 DI 10.1016/0140-3664(91)90029-Z PG 8 WC Computer Science, Information Systems; Engineering, Electrical & Electronic; Telecommunications SC Computer Science; Engineering; Telecommunications GA GH007 UT WOS:A1991GH00700004 ER PT J AU MCNEIL, MB JONES, JM LITTLE, BJ AF MCNEIL, MB JONES, JM LITTLE, BJ TI PRODUCTION OF SULFIDE MINERALS BY SULFATE-REDUCING BACTERIA DURING MICROBIOLOGICALLY INFLUENCED CORROSION OF COPPER SO CORROSION LA English DT Article DE MICROBIOLOGICALLY INFLUENCED CORROSION; SULFATE-REDUCING BACTERIA; CORROSION PRODUCT MINERALOGY; COPPER AB Mineralogical data, thermodynamic stability (Pourbaix) diagrams, and the simplexity principle for precipitation reactions were used to evaluate corrosion product mineralogy on copper alloys exposed to sulfate-reducing bacteria. The formation of copper sulfides as corrosion products in natural surface environments is suggestive of microbiologically influenced corrosion. Sulfide corrosion products other than chalcocite (Cu2S) indicate that reactions within a biofilm induced corrosion. C1 NAVAL SURFACE WARFARE CTR,SILVER SPRING,MD 20903. NAVAL OCEANOG & ATMOSPHER RES LAB,STENNIS SPACE CTR,MS 39529. RP MCNEIL, MB (reprint author), NAVAL COASTAL SYST CTR,PANAMA CITY,FL 32407, USA. NR 13 TC 25 Z9 25 U1 1 U2 8 PU NATL ASSN CORROSION ENG PI HOUSTON PA 1440 SOUTH CREEK DRIVE, HOUSTON, TX 77084-4906 SN 0010-9312 J9 CORROSION JI Corrosion PD SEP PY 1991 VL 47 IS 9 BP 674 EP 677 PG 4 WC Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Materials Science; Metallurgy & Metallurgical Engineering GA GT160 UT WOS:A1991GT16000004 ER PT J AU MORRIS, RE MUSHRUSH, GW AF MORRIS, RE MUSHRUSH, GW TI FUEL INSTABILITY MODEL STUDIES - THE LIQUID-PHASE COOXIDATION OF THIOLS AND INDENE BY OXYGEN SO ENERGY & FUELS LA English DT Article ID STABILITY AB Instability problems in middle distillate fuels have been correlated with the presence of both active olefin species and heteroatomic compounds such as thiols. It has been demonstrated that the type of sulfur compound rather than the total sulfur concentration is the key to fuel instability reactions. Research has shown that low concentrations of thiols will act as radical traps to inhibit autoxidation. When added to a fuel, thiols accelerated the rate of oxygen reaction without a commensurate increase in peroxidation. Evidence for the oxidative addition of thiols to olefins has been found to occur by studying the addition of thiophenol to indene in a model fuel during stressing in both a model system at temperatures in the 100-120-degrees-C range and in the JFTOT apparatus at temperatures up to 320-degrees-C. Similarities and differences were found in the two systems, with the product distribution being temperature dependent. This could account, in part, for the differences in thiol influences on autoxidation observed in model systems and in fuels. RP MORRIS, RE (reprint author), USN,RES LAB,TECHNOL CTR SAFETY & SURVIVABIL,CODE 6180,FUELS SECT,WASHINGTON,DC 20375, USA. NR 20 TC 3 Z9 3 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0887-0624 J9 ENERG FUEL JI Energy Fuels PD SEP-OCT PY 1991 VL 5 IS 5 BP 744 EP 748 DI 10.1021/ef00029a021 PG 5 WC Energy & Fuels; Engineering, Chemical SC Energy & Fuels; Engineering GA GG929 UT WOS:A1991GG92900021 ER PT J AU MUSHRUSH, GW BEAL, EJ HAZLETT, RN HARDY, DR AF MUSHRUSH, GW BEAL, EJ HAZLETT, RN HARDY, DR TI CHEMICAL BASIS OF INSTABILITY OF SHALE-DERIVED MIDDLE DISTILLATE FUELS - A MODEL STUDY OF THE INTERACTIVE EFFECTS BETWEEN 2,5-DIMETHYLPYRROLE AND 3-METHYLINDOLE WITH SULFONIC AND CARBOXYLIC-ACIDS SO ENERGY & FUELS LA English DT Article ID TERT-BUTYL HYDROPEROXIDE; SEDIMENT FORMATION; STORAGE STABILITY; OIL-SHALE; SYNFUELS; SYSTEMS AB Deposit formation in middle distillate fuels continues to be a problem. Fuel deterioration on storage is usually defined in terms of the formation of filterable sediments and/or peroxide species. Gravimetric stability tests have been conducted at 80-degrees-C using two model nitrogen heterocycles, 2,5-dimethylpyrrole (DMP) and 3-methylindole (3-MI), in an otherwise stable shale-derived diesel fuel. Potential interactive effects for these two model heterocycles in this stable fuel have been described in the presence of acid codopants, hexanoic acid, acetic acid, dodecylbenzenesulfonic acid, and p-toluenesulfonic acid. Both nitrogen dopants formed large amounts of insolubles and exhibited positive interactive effects, with dodecylbenzenesulfonic acid being the most active sediment promoter codopant. Hydroperoxide concentrations were monitored and are reported for each reaction mixture. C1 GEORGE MASON UNIV,DEPT CHEM,FAIRFAX,VA 22030. RP MUSHRUSH, GW (reprint author), USN,RES LAB,TECHNOL CTR SAFETY & SURVIVABIL,CODE 6180,WASHINGTON,DC 20375, USA. NR 22 TC 7 Z9 7 U1 1 U2 2 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0887-0624 J9 ENERG FUEL JI Energy Fuels PD SEP-OCT PY 1991 VL 5 IS 5 BP 749 EP 753 DI 10.1021/ef00029a022 PG 5 WC Energy & Fuels; Engineering, Chemical SC Energy & Fuels; Engineering GA GG929 UT WOS:A1991GG92900022 ER PT J AU SPIELBERG, H JUNE, CH BLAIR, OC NYSTROMROSANDER, C CEREB, N DEEG, HJ AF SPIELBERG, H JUNE, CH BLAIR, OC NYSTROMROSANDER, C CEREB, N DEEG, HJ TI UV IRRADIATION OF LYMPHOCYTES TRIGGERS AN INCREASE IN INTRACELLULAR CA2+ AND PREVENTS LECTIN-STIMULATED CA2+ MOBILIZATION - EVIDENCE FOR UV-SENSITIVE AND NIFEDIPINE-SENSITIVE CA2+ CHANNELS SO EXPERIMENTAL HEMATOLOGY LA English DT Article DE T-CELL ACTIVATION; UV IRRADIATION; CALCIUM MOBILIZATION; JURKAT CELLS ID CANINE DENDRITIC CELLS; TRANSFUSION-INDUCED SENSITIZATION; ULTRAVIOLET-IRRADIATION; T-CELLS; CLUSTER FORMATION; SUPPRESSOR CELLS; RADIATION; GENERATION; GRAFT; INVITRO AB UV irradiation induces in vitro and in vivo immunosuppression. Because mobilization of intracellular calcium ([Ca2+]i) represents a central step in cell activation and immune response, we investigated the effect of UV irradiation on Ca2+ homeostasis. Using indo- 1 and cytofluorometry, [Ca2+]i kinetics in UVC- or UVB-exposed human peripheral blood leukocytes (PBL) and Jurkat cells were determined in parallel with functional assays. Increases in [Ca2+]i were observed within 2-3 h of irradiation; these increases were UV-dose dependent and reached maxima of 240% and 180% above baseline level (130 nM) for UVB and UVC, respectively, The UV-induced [Ca2+]i rise was predominantly due to influx of extracellular calcium, and it was more pronounced in T than in non-T cells. Concurrent with [Ca2+]i shifts following UV treatment, there was a loss of ability to respond to phytohemagglutinin (PHA) or to proliferate or stimulate in mixed leukocyte culture. This loss of function appeared to be related not only to UV-induced calcium shifts, but also to effects of UV irradiation on the plasma membrane. No [Ca2+]i mobilization was induced by gamma irradiation, and gamma-irradiated cells showed a normal [Ca2+]i increase in response to PHA. UV-induced Ca2+ flux into the cells was blocked by nifedipine. These data indicate that UV and gamma irradiation have different effects on lymphocyte membranes and suggest that a disruption of Ca2+ homeostasis may be involved in UV-induced lymphocyte inhibition. The data suggest, furthermore, the presence of Ca2+ channels in lymphocyte membranes that are sensitive to UV irradiation and Ca2+ channel blockers such as nifedipine. C1 FRED HUTCHINSON CANC RES CTR,M318,1124 COLUMBIA ST,SEATTLE,WA 98104. USN,MED RES INST,WASHINGTON,DC 20350. GEORGETOWN UNIV,SCH MED,VINCENT T LOMBARDI CANC RES CTR,WASHINGTON,DC 20057. UNIV UPPSALA,S-75105 UPPSALA,SWEDEN. FU NCI NIH HHS [CA 18221]; NHLBI NIH HHS [HL 33859, HL 36444] NR 43 TC 23 Z9 26 U1 0 U2 1 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 SEP PY 1991 VL 19 IS 8 BP 742 EP 748 PG 7 WC Hematology; Medicine, Research & Experimental SC Hematology; Research & Experimental Medicine GA GC099 UT WOS:A1991GC09900004 PM 1651252 ER PT J AU SMITH, FP KIDWELL, DA AF SMITH, FP KIDWELL, DA TI ISOMERIC AMPHETAMINES - A PROBLEM FOR URINALYSIS SO FORENSIC SCIENCE INTERNATIONAL LA English DT Article DE URINALYSIS; IMMUNOASSAY; GAS CHROMATOGRAPHY MASS SPECTROMETRY; AMPHETAMINE ANALOGS AB Alkyl amphetamine isomers (amphetamine, 1-phenyl-2-butylamine (PBA), methamphetamine, N-methyl-PBA, N,N-dimethylamphetamine, N-ethylamphetamine, N-ethyl-PBA and NN-diethylamphetamine) were purchased or synthesized and tested by immunoassay and GC/MS for their detectability in urine. Some cross reactivity was observed with PBA, N-methyl-PBA N-ethylamphetamine, and N-ethyl-PBA when analyzed using a series of commercial amphetamine and methamphetamine immunoassays. Chromatographic co-elution problems were observed for the underivatized isomeric group N,N-dimethylamphetamine, N-ethylamphetamine, and N-methyl-PBA under GC/MS conditions used; and their GC/MS spectra were quite similar. Of the potential derivatives, pentafluoropropionyl (PFP) anhydride and heptafluorobutyryl (HFB) anhydride provided adequate separation and easily distinguishable spectra using the electron-impact GC/MS conditions specified. C1 USN,RES LAB,DIV CHEM,WASHINGTON,DC 20375. RP SMITH, FP (reprint author), UNIV ALABAMA,DEPT CRIMINAL JUSTICE,GRAD PROGRAM FORENS SCI,BIRMINGHAM,AL 35294, USA. NR 21 TC 5 Z9 5 U1 0 U2 0 PU ELSEVIER SCI IRELAND LTD PI CLARE PA CUSTOMER RELATIONS MANAGER, BAY 15, SHANNON INDUSTRIAL ESTATE CO, CLARE, IRELAND SN 0379-0738 J9 FORENSIC SCI INT JI Forensic Sci.Int. PD SEP PY 1991 VL 50 IS 2 BP 153 EP 165 DI 10.1016/0379-0738(91)90147-B PG 13 WC Medicine, Legal SC Legal Medicine GA GW439 UT WOS:A1991GW43900002 PM 1748353 ER PT J AU WHINNERY, JE AF WHINNERY, JE TI THE STATE OF G-LOC - REPLY SO IEEE ENGINEERING IN MEDICINE AND BIOLOGY MAGAZINE LA English DT Letter RP WHINNERY, JE (reprint author), USN,CTR AIR DEV,WARMINSTER,PA 18974, USA. NR 0 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 0739-5175 J9 IEEE ENG MED BIOL JI IEEE Eng. Med. Biol. Mag. PD SEP PY 1991 VL 10 IS 3 BP 4 EP 4 PG 1 WC Engineering, Biomedical; Medical Informatics SC Engineering; Medical Informatics GA GC207 UT WOS:A1991GC20700003 ER PT J AU BOWMAN, SR WININGS, MJ AUYEUNG, RCY TUCKER, JE SEARLES, SK FELDMAN, BJ AF BOWMAN, SR WININGS, MJ AUYEUNG, RCY TUCKER, JE SEARLES, SK FELDMAN, BJ TI LASER AND SPECTRAL PROPERTIES OF CR, TM, HO - YAG AT 2.1 MU-M SO IEEE JOURNAL OF QUANTUM ELECTRONICS LA English DT Article AB We report an extensive set of measurements on flashlamp pumped YAG crystals doped with chromium, thulium, and holmium. Near-room-temperature laser operation on the 2.1-mu-m holmium transitions was characterized using a frequency selective resonator. Small signal gain and stored energy lifetimes were analyzed to determine the strength and dependence of loss mechanisms. Analysis of thermal lensing experiments demonstrated a high degree of excess heat generation in this material. C1 SACHS FREEMAN ASSOCIATES INC,LANDOVER,MD 20785. GEO CENTERS INC,FT WASHINGTON,MD 20744. RP BOWMAN, SR (reprint author), USN,RES LAB,LASER PHYS BRANCH,ADV LASER CONCEPTS SECT,CODE 6540,WASHINGTON,DC 20375, USA. RI Winings, Michael/A-4924-2010 NR 14 TC 37 Z9 43 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 0018-9197 J9 IEEE J QUANTUM ELECT JI IEEE J. Quantum Electron. PD SEP PY 1991 VL 27 IS 9 BP 2142 EP 2149 DI 10.1109/3.135173 PG 8 WC Engineering, Electrical & Electronic; Optics; Physics, Applied SC Engineering; Optics; Physics GA GJ183 UT WOS:A1991GJ18300010 ER PT J AU FOUTS, DJ BUTNER, SE AF FOUTS, DJ BUTNER, SE TI ARCHITECTURE AND DESIGN OF A 500-MHZ GALLIUM-ARSENIDE PROCESSING ELEMENT FOR A PARALLEL SUPERCOMPUTER SO IEEE JOURNAL OF SOLID-STATE CIRCUITS LA English DT Article ID GAAS AB This paper presents the design of the processing element of GASP, a GaAs supercomputer with a 500-MHz instruction issue rate and 1-GHz subsystem clocks. The novel, functionally modular, block data flow architecture of GASP is described. The architecture and design of a GASP processing element is then presented. The processing element (PE) is implemented in a hybrid semiconductor module with 152 custom GaAs IC's of eight different types. The effects of the implementation technology on both the system-level architecture and the PE design are discussed. SPICE simulations indicate that parts of the PE are capable of being clocked at 1 GHz, while the rest of the PE uses a 500-MHz clock. The new architecture utilizes data flow techniques at a program block level, which allows efficient execution of parallel programs while maintaining reasonably good performance on sequential programs. A simulation study of the architecture indicates that an instruction execution rate of over 30 000 MIPS can be attained with 65 PE's. C1 UNIV CALIF SANTA BARBARA,DEPT ELECT & COMP ENGN,SANTA BARBARA,CA 93106. RP FOUTS, DJ (reprint author), USN,POSTGRAD SCH,DEPT ELECT & COMP ENGN,MONTEREY,CA 93943, USA. NR 36 TC 0 Z9 0 U1 0 U2 0 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0018-9200 J9 IEEE J SOLID-ST CIRC JI IEEE J. Solid-State Circuit PD SEP PY 1991 VL 26 IS 9 BP 1199 EP 1211 DI 10.1109/4.84936 PG 13 WC Engineering, Electrical & Electronic SC Engineering GA GC003 UT WOS:A1991GC00300003 ER PT J AU BALDAUF, J LEE, SW LIN, L JENG, SK SCARBOROUGH, SM YU, CL AF BALDAUF, J LEE, SW LIN, L JENG, SK SCARBOROUGH, SM YU, CL TI HIGH-FREQUENCY SCATTERING FROM TRIHEDRAL CORNER REFLECTORS AND OTHER BENCHMARK TARGETS - SBR VERSUS EXPERIMENT SO IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION LA English DT Article ID RCS; CAVITIES AB A general method for calculating radar cross section (RCS) from a three-dimensional target is described. The target is first constructed by using a solid geometry modeling computer-aided design (CAD) package developed at the Army Ballistic Research Laboratory. Following the shooting and bouncing ray method, a very dense grid of rays is launched from the incident direction toward the target. Each ray is traced according to the geometrical optics theory including the effect of ray tube divergence, polarization, and material reflection coefficient. At the point where the ray exists the target, a physical optics-type integration is performed to obtain the scattered far fields. We test this method using several simple examples involving interaction among plates, cylinders, and spheres. Our theoretical results are generally in good agreement with measured data. C1 USN,PACIFIC MISSILE TEST CTR,POINT MUGU,CA 93042. MIT,LINCOLN LAB,LEXINGTON,MA 02173. NATL TAIWAN UNIV,TAIPEI,TAIWAN. MOTOROLA INC,LAND MOBILE PROD SECTOR,SCHAUMBURG,IL 60196. RP BALDAUF, J (reprint author), UNIV ILLINOIS,DEPT ELECT & COMP ENGN,URBANA,IL 61801, USA. NR 17 TC 56 Z9 64 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 0018-926X J9 IEEE T ANTENN PROPAG JI IEEE Trans. Antennas Propag. PD SEP PY 1991 VL 39 IS 9 BP 1345 EP 1351 DI 10.1109/8.99043 PG 7 WC Engineering, Electrical & Electronic; Telecommunications SC Engineering; Telecommunications GA GL904 UT WOS:A1991GL90400010 ER PT J AU JENN, DC RUSCH, WVT AF JENN, DC RUSCH, WVT TI LOW-SIDELOBE REFLECTOR SYNTHESIS AND DESIGN USING RESISTIVE SURFACES SO IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION LA English DT Article AB A procedure is presented for determining the resistivity of a paraboloid's reflecting surface to obtain a desired sidelobe level. The only requirement is that the normalized aperture distribution due to the feed be greater than the corresponding normalized low sidelobe distribution at every point on the reflector (i.e., the reflection coefficient of the surface less-than-or-equal-to 1). In the synthesis procedure blockage is ignored and an ideal feed is assumed. In spite of this, computation of the secondary patterns of a resistively corrected antenna including the feed using the method of moments show that a -40 dB sidelobe level is achievable. In principal there is no limit in the sidelobe reduction for the field scattered from the reflector. In practice, blockage, feed illumination errors, errors in the surface resistivity and the feed backlobe will limit the sidelobe level. C1 UNIV SO CALIF,DEPT STRAHLEN,LOS ANGELES,CA 90089. RP JENN, DC (reprint author), USN,POSTGRAD SCH,DEPT ELECT ENGN,MONTEREY,CA 93943, USA. NR 6 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 SEP PY 1991 VL 39 IS 9 BP 1372 EP 1375 DI 10.1109/8.99046 PG 4 WC Engineering, Electrical & Electronic; Telecommunications SC Engineering; Telecommunications GA GL904 UT WOS:A1991GL90400013 ER PT J AU DRIELS, M KLEGKA, JS AF DRIELS, M KLEGKA, JS TI ANALYSIS OF ALTERNATIVE REWORK STRATEGIES FOR PRINTED WIRING ASSEMBLY MANUFACTURING SYSTEMS SO IEEE TRANSACTIONS ON COMPONENTS HYBRIDS AND MANUFACTURING TECHNOLOGY LA English DT Article AB This paper presents a model for predicting the cost of test, diagnosis, and rework activities in the manufacture of printed wiring assemblies (PWA's). Rework is defined as all actions taken to correct or improve the basic assembly process. These actions may include those of inspectors and solder touchup technicians who do not add value to the PWA, but whose actions are required in order to produce acceptable yields from the manufacturing process. Two alternative rework strategies for contemporary PWA manufacturing systems are presented: terminal rework and distributed rework. Rework may occur after all assembly operations have been accomplished (terminal rework) or it may be distributed throughout the assembly process. This paper analyzes the economic basis for deciding between the two rework strategies. The paper assumes that the only reason for utilizing distributed rework is to reduce the cost of producing acceptable PWA's, otherwise the cost of the distributed rework effort cannot be justified. The paper presents a model of each rework strategy. The effect of each strategy upon first pass yield (FPY) of the manufacturing process is discussed. The effect on FPY is then used to evaluate the economic benefit of each rework strategy as an aid in deciding which strategy to use. The increase in FPY needed to justify distributed rework is calculated. C1 US MIL ACAD,DEPT CIVIL & MECH ENGN,W POINT,NY 10996. RP DRIELS, M (reprint author), USN,POSTGRAD SCH,DEPT MECH ENGN,MONTEREY,CA 93943, USA. NR 17 TC 8 Z9 8 U1 0 U2 0 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0148-6411 J9 IEEE T COMPON HYBR PD SEP PY 1991 VL 14 IS 3 BP 637 EP 644 DI 10.1109/33.83956 PG 8 WC Engineering, Manufacturing; Engineering, Electrical & Electronic; Materials Science, Multidisciplinary SC Engineering; Materials Science GA GC910 UT WOS:A1991GC91000032 ER PT J AU DINGER, RJ BOWLING, DR MARTIN, AM AF DINGER, RJ BOWLING, DR MARTIN, AM TI A SURVEY OF POSSIBLE PASSIVE ANTENNA APPLICATIONS OF HIGH-TEMPERATURE SUPERCONDUCTORS SO IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES LA English DT Article DE HIGH TEMPERATURE SUPERCONDUCTIVITY; ANTENNAS; ELECTRICALLY SMALL ANTENNAS; ANTENNA FEED NETWORKS; ANTENNA ARRAYS; SUPERDIRECTIVITY ID DIPOLE ANTENNA AB A survey of possible applications of high-temperature superconductors (HTS's) to antennas and antenna feed networks is presented. The frequency range of consideration is 1 MHz to 100 GHz. Three antenna application areas seem appropriate for HTS material: electrically small antennas and their matching networks; feed and matching networks for compact arrays with enhanced directive gain (superdirective arrays); and feed networks for millimeter-wave arrays. Preliminary experimental results are presented on YBaCuO and TlBaCaCuO 500 MHz half-loop antennas that show an increase in radiation efficiency (compared with a copper antenna at the same temperature) by a factor of 5 for the HTS antennas. RP DINGER, RJ (reprint author), USN,CTR WEAP,RES DEPT,RF & MICROWAVE TECHNOL BRANCH,CHINA LAKE,CA 93555, USA. NR 19 TC 43 Z9 43 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 0018-9480 J9 IEEE T MICROW THEORY JI IEEE Trans. Microw. Theory Tech. PD SEP PY 1991 VL 39 IS 9 BP 1498 EP 1507 DI 10.1109/22.83824 PG 10 WC Engineering, Electrical & Electronic SC Engineering GA GA255 UT WOS:A1991GA25500010 ER PT J AU ROMMEL, CG AF ROMMEL, CG TI THE PROBABILITY OF LOAD BALANCING SUCCESS IN A HOMOGENEOUS NETWORK SO IEEE TRANSACTIONS ON SOFTWARE ENGINEERING LA English DT Article DE LOAD BALANCING; DISTRIBUTED SYSTEMS; QUEUING THEORY; PERFORMANCE EVALUATION; PROCESS SCHEDULING; NETWORKS ID DISTRIBUTED SYSTEMS AB In this paper we examine the problem of load balancing in distributed systems composed of several homogeneous sites connected by a subnet. We determine a general formula for the probability that any one site in the system is underloaded while some other site in the system is overloaded. This probability can be used to define the likelihood of load balancing success in a distributed operating system. This probability gives insight into the utilization of the system and is a useful aid in determining a measure of effectiveness [26] of the system. From our formula we are able to determine this probability when the workload is composed of processes typical to distributed systems such as those given in [15], [20], and [12]. Finally, we demonstrate the influence of variants in the load balancing algorithm on this probability. C1 USN,CTR UNDERWATER SYST,NEW LONDON,CT 06320. RP ROMMEL, CG (reprint author), EASTERN CONNECTICUT STATE UNIV,DEPT MATH & COMP SCI,WILLIMANTIC,CT 06226, USA. NR 27 TC 17 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 SEP PY 1991 VL 17 IS 9 BP 922 EP 933 DI 10.1109/32.92912 PG 12 WC Computer Science, Software Engineering; Engineering, Electrical & Electronic SC Computer Science; Engineering GA GH771 UT WOS:A1991GH77100006 ER PT J AU IYENGAR, SS KASHYAP, RL MADAN, RN AF IYENGAR, SS KASHYAP, RL MADAN, RN TI DISTRIBUTED SENSOR NETWORKS - INTRODUCTION TO THE SPECIAL SECTION SO IEEE TRANSACTIONS ON SYSTEMS MAN AND CYBERNETICS LA English DT Article C1 PURDUE UNIV,DEPT ELECT ENGN,W LAFAYETTE,IN 47907. OFF NAVAL RES,DIV ELECTR,ARLINGTON,VA 22217. PURDUE UNIV,ENGN RES CTR INTELLIGENT MFG SYST,W LAFAYETTE,IN 47907. LOUISIANA STATE UNIV,ROBOT RES LAB,BATON ROUGE,LA 70603. RP IYENGAR, SS (reprint author), LOUISIANA STATE UNIV,DEPT COMP SCI,BATON ROUGE,LA 70603, USA. NR 15 TC 19 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 0018-9472 J9 IEEE T SYST MAN CYB JI IEEE Trans. Syst. Man Cybern. PD SEP-OCT PY 1991 VL 21 IS 5 BP 1027 EP 1031 PG 5 WC Computer Science, Cybernetics; Engineering, Electrical & Electronic SC Computer Science; Engineering GA HG003 UT WOS:A1991HG00300009 ER PT J AU BARNHART, CM ZIEMER, RE AF BARNHART, CM ZIEMER, RE TI TOPOLOGICAL ANALYSIS OF SATELLITE-BASED DISTRIBUTED SENSOR NETWORKS SO IEEE TRANSACTIONS ON SYSTEMS MAN AND CYBERNETICS LA English DT Article AB A method for evaluating the topological quality of networks for distributed sensor applications is presented. The criteria for evaluation are network survivability and delay. Nodal connectivity is used to characterize survivability, and mean path length is used to characterize delay. To calculate these two quantities, an algorithm is developed to find k shortest node-disjoint paths between a pair of nodes when each link has unit distance. As an example of the use of this type of analysis, the effects of nodal losses in a multiple-node satellite network consisting of a Walker low-orbit sphere and a geosynchronous constellation are examined. The example demonstrates how topological analysis on the basis of connectivity and mean path length may be used to detect, and subsequently address, potential flaws in a network design. The results show that the geosynchronous/low-orbit link assignment protocol should be a primary concern in the design of this network. They also show that the nodal degree of the failed node, and the distribution of links between the Walker sphere and the geosynchronous constellation, are the fundamental determinants of mean path length. C1 UNIV COLORADO,DEPT ELECT & COMP ENGN,COLORADO SPRINGS,CO 80933. RP BARNHART, CM (reprint author), USN,RES LAB,DIV INFORMAT TECHNOL,WASHINGTON,DC 20375, USA. NR 21 TC 0 Z9 0 U1 0 U2 0 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0018-9472 J9 IEEE T SYST MAN CYB JI IEEE Trans. Syst. Man Cybern. PD SEP-OCT PY 1991 VL 21 IS 5 BP 1060 EP 1070 DI 10.1109/21.120058 PG 11 WC Computer Science, Cybernetics; Engineering, Electrical & Electronic SC Computer Science; Engineering GA HG003 UT WOS:A1991HG00300012 ER PT J AU PRASAD, L IYENGAR, SS KASHYAP, RL MADAN, RN AF PRASAD, L IYENGAR, SS KASHYAP, RL MADAN, RN TI FUNCTIONAL-CHARACTERIZATION OF FAULT TOLERANT INTEGRATION IN DISTRIBUTED SENSOR NETWORKS SO IEEE TRANSACTIONS ON SYSTEMS MAN AND CYBERNETICS LA English DT Article ID MULTISENSOR INTEGRATION; FUSION; SYSTEMS AB Fault-tolerance is an important issue in network design because sensor networks must function in a dynamic, uncertain world. A functional characterization of the fault-tolerant integration of abstract interval estimates is proposed. This model provides a preliminary version for a general framework that is hoped to develop to address the general problem of fault-tolerant integration of abstract sensor estimates. It is further proposed that a scheme for narrowing the width of the sensor output in a specific failure model and give it a functional representation. The main distinguishing feature of our model over the original Marzullo's model is in reducing the width of the output interval estimate significantly in most cases where the number of sensors involved is large. C1 LOUISIANA STATE UNIV,ROBOT RES LAB,BATON ROUGE,LA 70803. OFF NAVAL RES,DIV ELECTR,ARLINGTON,VA 22217. PURDUE UNIV,DEPT ELECT ENGN,W LAFAYETTE,IN 47907. PURDUE UNIV,ENGN RES CTR INTELLIGENT MFG SYST,W LAFAYETTE,IN 47907. RP PRASAD, L (reprint author), LOUISIANA STATE UNIV,DEPT COMP SCI,BATON ROUGE,LA 70803, USA. NR 14 TC 27 Z9 29 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 0018-9472 J9 IEEE T SYST MAN CYB JI IEEE Trans. Syst. Man Cybern. PD SEP-OCT PY 1991 VL 21 IS 5 BP 1082 EP 1087 DI 10.1109/21.120060 PG 6 WC Computer Science, Cybernetics; Engineering, Electrical & Electronic SC Computer Science; Engineering GA HG003 UT WOS:A1991HG00300014 ER PT J AU GOODMAN, IR AF GOODMAN, IR TI EVALUATION OF COMBINATIONS OF CONDITIONED INFORMATION - A HISTORY SO INFORMATION SCIENCES LA English DT Article ID PROBABILITY AB This paper considers the history of the problem of combining probabilistic-related information in implicative or conditional form. At present, no satisfactory technique exists for handling the probability evaluation p((a\b) V (c\d)) or other compounds of conditional expressions where a, b, c, d are all ordinary statements or events lying in some common boolean algebra and p is a probability measure compatible with the component evaluations p((a\b)) = p(a\b) and p((c\d)) = p(c\d), where p(a\b) = p(a.b)/p(b), p(c\d) = p(c.d)/p(d), the ordinary conditional probability evaluations, assuming in general p(b) not-equal p(d) > 0. Surprisingly, relatively few individuals have ever considered this problem formally, and the proposed solutions have been either mathematically unsatisfactory, incomplete, or ad hoc. RP GOODMAN, IR (reprint author), USN,DEPT COMMAND & CONTROL,SAN DIEGO,CA 92152, USA. NR 56 TC 5 Z9 6 U1 0 U2 1 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 SEP-DEC PY 1991 VL 57-8 BP 79 EP 110 DI 10.1016/0020-0255(91)90069-7 PG 32 WC Computer Science, Information Systems SC Computer Science GA FN459 UT WOS:A1991FN45900005 ER PT J AU STOCKTON, PN AF STOCKTON, PN TI THE NEW GAME ON THE HILL - THE POLITICS OF ARMS-CONTROL AND STRATEGIC-FORCE MODERNIZATION SO INTERNATIONAL SECURITY LA English DT Article ID START RP STOCKTON, PN (reprint author), USN,POSTGRAD SCH,NATL SECUR AFFAIRS,MONTEREY,CA 93940, USA. NR 83 TC 4 Z9 4 U1 0 U2 0 PU MIT PRESS PI CAMBRIDGE PA 55 HAYWARD ST JOURNALS DEPT, CAMBRIDGE, MA 02142 SN 0162-2889 J9 INT SECURITY JI Int. Secur. PD FAL PY 1991 VL 16 IS 2 BP 146 EP 170 DI 10.2307/2539063 PG 25 WC International Relations SC International Relations GA GN760 UT WOS:A1991GN76000005 ER PT J AU MICHEL, J BENTON, JL FERRANTE, RF JACOBSON, DC EAGLESHAM, DJ FITZGERALD, EA XIE, YH POATE, JM KIMERLING, LC AF MICHEL, J BENTON, JL FERRANTE, RF JACOBSON, DC EAGLESHAM, DJ FITZGERALD, EA XIE, YH POATE, JM KIMERLING, LC TI IMPURITY ENHANCEMENT OF THE 1.54-MU-M ER3+ LUMINESCENCE IN SILICON SO JOURNAL OF APPLIED PHYSICS LA English DT Article ID MOLECULAR-BEAM EPITAXY; GAAS-ER; ERBIUM; PHOTOLUMINESCENCE AB The effect of impurity coimplantation in MeV erbium-implanted silicon is studied. A significant increase in the intensity of the 1.54-mu-m Er3+ emission was observed for different coimplants. This study shows that the Er3+ emission is observed if erbium can form an impurity complex in silicon. The influence of these impurities on the Er3+ photoluminescence spectrum is demonstrated. Furthermore we show the first room-temperature photoluminescence spectrum of erbium in crystalline silicon. C1 AT&T BELL LABS,MURRAY HILL,NJ 07974. USN ACAD,DEPT CHEM,ANNAPOLIS,MD 21402. NR 17 TC 370 Z9 375 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 SEP 1 PY 1991 VL 70 IS 5 BP 2672 EP 2678 DI 10.1063/1.349382 PG 7 WC Physics, Applied SC Physics GA GE658 UT WOS:A1991GE65800025 ER PT J AU KWON, YW BYUN, KY AF KWON, YW BYUN, KY TI DEVELOPMENT OF MICROMECHANICS FINITE-ELEMENT FOR ANALYSIS OF COMPOSITES WITH LOCAL DAMAGE SO JOURNAL OF ENERGY RESOURCES TECHNOLOGY-TRANSACTIONS OF THE ASME LA English DT Article AB An analysis model is presented to analyze continuous fiber-reinforced composite structures with some local damage such as matrix cracks. Two separate material properties of fiber and matrix are used in the analysis model instead of a smeared-out global anisotropic material property. Stresses acting on fibers and stresses acting on matrix are computed directly. If there are local matrix cracks in the direction perpendicular to the fiber orientation in a composite structure, the broken matrix is modeled not to sustain any tensile stress in the fiber direction. A finite element formulation is derived for the analysis model. Some numerical problems are presented to test the proposed analysis model. RP KWON, YW (reprint author), USN,POSTGRAD SCH,DEPT MECH ENGN,MONTEREY,CA 93943, USA. NR 0 TC 1 Z9 1 U1 0 U2 1 PU ASME-AMER SOC MECHANICAL ENG PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 SN 0195-0738 J9 J ENERG RESOUR-ASME JI J. Energy Resour. Technol.-Trans. ASME PD SEP PY 1991 VL 113 IS 3 BP 171 EP 175 DI 10.1115/1.2905800 PG 5 WC Energy & Fuels SC Energy & Fuels GA HP691 UT WOS:A1991HP69100007 ER PT J AU MELESE, F MICHEL, P AF MELESE, F MICHEL, P TI UNCERTAINTY IN TAX-REFORM - THE CASE OF AN EXTRACTIVE FIRM SO JOURNAL OF ENVIRONMENTAL ECONOMICS AND MANAGEMENT LA English DT Article ID SUBSTITUTE C1 UNIV PARIS 01,DEPT MATH ECON,F-75231 PARIS,FRANCE. RP MELESE, F (reprint author), NAVAL POST GRAD SCH,DRMEC,CODE 64ME,MONTEREY,CA 93943, USA. NR 13 TC 1 Z9 1 U1 0 U2 1 PU ACADEMIC PRESS INC JNL-COMP SUBSCRIPTIONS PI SAN DIEGO PA 525 B ST, STE 1900, SAN DIEGO, CA 92101-4495 SN 0095-0696 J9 J ENVIRON ECON MANAG JI J.Environ.Econ.Manage. PD SEP PY 1991 VL 21 IS 2 BP 140 EP 153 DI 10.1016/0095-0696(91)90038-K PG 14 WC Business; Economics; Environmental Studies SC Business & Economics; Environmental Sciences & Ecology GA GA373 UT WOS:A1991GA37300004 ER PT J AU SWEAN, TF RAMBERG, SE MINER, EW AF SWEAN, TF RAMBERG, SE MINER, EW TI ANISOTROPY IN A TURBULENT JET NEAR A FREE-SURFACE SO JOURNAL OF FLUIDS ENGINEERING-TRANSACTIONS OF THE ASME LA English DT Article ID LAYER; FLOWS AB Laboratory measurements of the turbulent flow in a plane jet issuing at the free surface are reported and analyzed. Single point hot-film data were obtained for mean velocities and turbulent fluctuations of velocity and shear stress in the developing jet to x1/b0 = 240 with an emphasis on the near surface turbulent behavior. Anisotropy distributions indicate two layers within the jet. In a surface-influenced layer of thickness comparable to 1.5 times the local jet half-width, the vertical anisotropy is constant and the primary net energy transfer is from the streamwise component of turbulent kinetic energy to the spanwise component. In a near-surface layer of about 1/4 the local half-width, the vertical fluctuations decrease rapidly with a concomitant redistribution of energy to the horizontal components. Analysis of one-dimensional spectra reveal integral scales that are consistent with the anisotropy data and in qualitative agreement with analyses and experiments for isotropic turbulence near moving walls and free surfaces but differs by exhibiting a wider range of surface-influenced turbulent length scales. C1 USN,RES LAB,CTR ADV SPACE SENSING,WASHINGTON,DC 20375. OFF NAVAL RES,DIV OCEAN ENGN,ARLINGTON,VA 22217. NR 19 TC 8 Z9 8 U1 0 U2 1 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 SEP PY 1991 VL 113 IS 3 BP 430 EP 438 DI 10.1115/1.2909514 PG 9 WC Engineering, Mechanical SC Engineering GA HP711 UT WOS:A1991HP71100012 ER PT J AU PETERSON, BL AF PETERSON, BL TI EXTERNAL BEVELING OF CRANIAL GUNSHOT ENTRANCE WOUNDS SO JOURNAL OF FORENSIC SCIENCES LA English DT Article DE PATHOLOGY AND BIOLOGY; WOUND BALLISTICS; BEVELLING; GUNSHOT WOUNDS; SKULLS AB Entrance gunshot wounds of the skull generally have internal beveling. External beveling has been previously described in association with internal beveling (keyhole defect) and with wounds from handgun projectiles. An accidental shooting is described in which a 22-year-old male sustained a perforating gunshot wound of the head at distant range from a 5.56-mm (.223-caliber) fully jacketed rifle round. Although the entrance wound had symmetrical external beveling, misinterpretation of this particular entrance wound as an exit wound would have been difficult. C1 USN HOSP,DEPT LAB MED,DIV ANAT PATHOL,SAN DIEGO,CA 92134. RP PETERSON, BL (reprint author), USN HOSP,DEPT CLIN INVEST,SAN DIEGO,CA 92134, USA. NR 8 TC 19 Z9 19 U1 0 U2 1 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 SEP PY 1991 VL 36 IS 5 BP 1592 EP 1595 PG 4 WC Medicine, Legal SC Legal Medicine GA GF647 UT WOS:A1991GF64700035 PM 1955845 ER PT J AU OLSEN, RC NORWOOD, CW AF OLSEN, RC NORWOOD, CW TI SPACECRAFT-GENERATED IONS SO JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS LA English DT Article ID ORBIT AB Electrostatic analyzer measurements of ions on the SCATHA satellite show evidence of locally generated ions. These measurements come during periods of large negative charging (approximately - 100 to - 10,000 V) at or near geosynchronous altitude. Ions are observed at energies below the satellite potential, which, in the absence of scattering, must have been generated on or near the satellite surface. Differential charging measurements from the surface satellite potential monitor indicated that there were surfaces with the proper magnitude of differential charging to provide a source for the observed ions. Application of the Sigmund-Thompson theories on sputtering show that ambient 10- to 100-keV O+ on glass could provide a yield of 0.5-1.0 particles per incident ion. Roughly 2-4% of this yield is ionized. This is sufficient to explain the flux levels observed. Particle tracking using the NASA charging analyzer program (NASCAP) showed that the energies measured provided a sweep of trajectories along the satellite surface, but no specific source was identified. RP OLSEN, RC (reprint author), USN,POSTGRAD SCH,DEPT PHYS,MONTEREY,CA 93943, USA. RI Olsen, Richard/O-2699-2015 OI Olsen, Richard/0000-0002-8344-9297 NR 22 TC 1 Z9 1 U1 0 U2 0 PU AMER GEOPHYSICAL UNION PI WASHINGTON PA 2000 FLORIDA AVE NW, WASHINGTON, DC 20009 SN 0148-0227 J9 J GEOPHYS RES JI J. Geophys. Res-Space Phys. PD SEP 1 PY 1991 VL 96 IS A9 BP 15951 EP 15962 DI 10.1029/91JA00675 PG 12 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA GE416 UT WOS:A1991GE41600023 ER PT J AU GONZALEZ, RA MEHAY, SL DUFFYDENO, K AF GONZALEZ, RA MEHAY, SL DUFFYDENO, K TI MUNICIPAL RESIDENCY LAWS - EFFECTS ON POLICE EMPLOYMENT, COMPENSATION, AND PRODUCTIVITY SO JOURNAL OF LABOR RESEARCH LA English DT Article ID UNIONIZATION; ECONOMY C1 USN,POSTGRAD SCH,MONTEREY,CA 93943. WEBER STATE UNIV,OGDEN,UT 84408. RP GONZALEZ, RA (reprint author), SAN JOSE STATE UNIV,SAN JOSE,CA 95192, USA. NR 19 TC 2 Z9 2 U1 1 U2 1 PU JOURNAL OF LABOR RESEARCH PI FAIRFAX PA DEPT ECONOMICS GEORGE MASON UNIV, FAIRFAX, VA 22030-4444 SN 0195-3613 J9 J LABOR RES JI J. Labor Res. PD FAL PY 1991 VL 12 IS 4 BP 439 EP 452 DI 10.1007/BF02685440 PG 14 WC Industrial Relations & Labor SC Business & Economics GA GD951 UT WOS:A1991GD95100016 ER PT J AU BUCARO, JA LAGAKOS, N HOUSTON, BH DANDRIDGE, A AF BUCARO, JA LAGAKOS, N HOUSTON, BH DANDRIDGE, A TI HIGH-FREQUENCY RESPONSE OF FIBEROPTIC PLANAR ACOUSTIC SENSORS SO JOURNAL OF LIGHTWAVE TECHNOLOGY LA English DT Article AB The frequency response of planar interferometric fiber-optic acoustic hydrophones is considered. It is shown that such sensors formed from materials whose impedance closely matches that of the fluid generally have acoustically induced acceleration effects which tend to decrease the high frequency response for the normal incidence case. Planar sensor configurations are identified which reduce this effect, and measurements on one such configuration are presented to confirm this. RP BUCARO, JA (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 7 TC 9 Z9 10 U1 1 U2 4 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0733-8724 J9 J LIGHTWAVE TECHNOL JI J. Lightwave Technol. PD SEP PY 1991 VL 9 IS 9 BP 1195 EP 1199 DI 10.1109/50.85817 PG 5 WC Engineering, Electrical & Electronic; Optics; Telecommunications SC Engineering; Optics; Telecommunications GA GC203 UT WOS:A1991GC20300020 ER PT J AU CONRADI, MS GARROWAY, AN CORY, DG MILLER, JB AF CONRADI, MS GARROWAY, AN CORY, DG MILLER, JB TI GENERATION OF SHORT, INTENSE GRADIENT PULSES SO JOURNAL OF MAGNETIC RESONANCE LA English DT Article ID NMR; SOLIDS; RESOLUTION; DIFFUSION; SEQUENCES; IMAGES C1 USN,RES LAB,DIV CHEM,CODE 6122,WASHINGTON,DC 20375. WASHINGTON UNIV,DEPT PHYS,ST LOUIS,MO 63130. NR 20 TC 27 Z9 27 U1 0 U2 1 PU ACADEMIC PRESS INC JNL-COMP SUBSCRIPTIONS PI SAN DIEGO PA 525 B ST, STE 1900, SAN DIEGO, CA 92101-4495 SN 0022-2364 J9 J MAGN RESON PD SEP PY 1991 VL 94 IS 2 BP 370 EP 375 DI 10.1016/0022-2364(91)90114-9 PG 6 WC Biochemical Research Methods; Physics, Atomic, Molecular & Chemical; Spectroscopy SC Biochemistry & Molecular Biology; Physics; Spectroscopy GA GE650 UT WOS:A1991GE65000012 ER PT J AU NEED, JT DALE, WE KEIRANS, JE DASCH, GA AF NEED, JT DALE, WE KEIRANS, JE DASCH, GA TI ANNOTATED LIST OF TICKS (ACARI, IXODIDAE, ARGASIDAE) REPORTED IN PERU - DISTRIBUTION, HOSTS, AND BIBLIOGRAPHY SO JOURNAL OF MEDICAL ENTOMOLOGY LA English DT Article DE ARACHNIDA; ARGASIDAE; IXODIDAE; PERU ID IXODOIDEA; SUBGENUS AB A literature review and compilation of the tick specimens found in Peru and now held in the National Tick Collection was carried out to develop a working list of the tick species likely to be found in Peru. Evidence of 44 species (29 Ixodididae, 15 Argasidae) was found; representatives of 40 species are held as reference specimens. This report adds 14 species to the previously published list. C1 USN,MED RES INST DETACHMENT,LIMA PERU,APO,MIAMI,FL 34031. NR 88 TC 19 Z9 23 U1 0 U2 2 PU ENTOMOL SOC AMER PI LANHAM PA 9301 ANNAPOLIS RD, LANHAM, MD 20706 SN 0022-2585 J9 J MED ENTOMOL JI J. Med. Entomol. PD SEP PY 1991 VL 28 IS 5 BP 590 EP 597 PG 8 WC Entomology; Veterinary Sciences SC Entomology; Veterinary Sciences GA GG448 UT WOS:A1991GG44800005 PM 1941924 ER PT J AU BOGACZ, T AF BOGACZ, T TI THE UPHEAVAL OF WAR - FAMILY, WORK, AND WELFARE IN EUROPE, 1914-1918 - WALL,R, WINTER,J SO JOURNAL OF MODERN HISTORY LA English DT Book Review RP BOGACZ, T (reprint author), USN ACAD, ANNAPOLIS, MD 21402 USA. NR 1 TC 0 Z9 0 U1 0 U2 0 PU UNIV CHICAGO PRESS PI CHICAGO PA 1427 E 60TH ST, CHICAGO, IL 60637-2954 USA SN 0022-2801 J9 J MOD HIST JI J. Mod. Hist. PD SEP PY 1991 VL 63 IS 3 BP 559 EP 564 PG 6 WC History SC History GA GH321 UT WOS:A1991GH32100010 ER PT J AU ALLARD, T CLARK, SA JENKINS, WM MERZENICH, MM AF ALLARD, T CLARK, SA JENKINS, WM MERZENICH, MM TI REORGANIZATION OF SOMATOSENSORY AREA 3B REPRESENTATIONS IN ADULT OWL MONKEYS AFTER DIGITAL SYNDACTYLY SO JOURNAL OF NEUROPHYSIOLOGY LA English DT Article ID SQUIRREL-MONKEYS; BODY-SURFACE; FUNCTIONAL REORGANIZATION; PROJECTION NEURONS; RECEPTIVE-FIELDS; MACAQUE MONKEYS; SENSORY INPUTS; CORTEX; HAND; CAT AB 1. These experiments were designed to test the hypothesis that temporally correlated afferent input activity plays a lifelong role in the establishment and modification of receptive fields (RFs) and representational topographies in the primary somatosensory cortex of adult monkeys. They were based in part on the finding that adjacent digits of the hand are represented discontinuously in area 3b of the adult owl monkey. If cortical receptive fields and the details of cortical topographic representations are shaped by the weights of the temporal correlations among afferent inputs, then representational discontinuities between digits would be expected to arise because inputs from the skin surfaces of adjacent digits are largely independent in the critical time domain. 2. In the present experiments, the skin of adjacent digits 3 and 4 of the monkey hand was surgically connected to create an artificial syndactyly, or webbed-finger condition. Highly detailed microelectrode maps of the cortical representation of the syndactyl digits were obtained 3-7.5 mo later. This experimental manipulation greatly increased the amount of simultaneous or nearly simultaneous input from the normally separated, now fused, surfaces of adjacent fingers. 3. Cortical maps of the representations of finger surfaces were highly modified from the normal after a several-month-long period of digital fusion. Specifically, the normal discontinuity between the cortical representations of adjacent fingers was abolished. Within a wide cortical zone, RFs were defined that extended across the line of syndactyly onto the surgically joined skin of both fused digits. The representational topography of the fused digits was similar to any normal single digit and was characterized by a continuous progression of partially overlapping RFs. 4. Control observations revealed that these reorganizational changes cannot be accounted for by any changes in cutaneous innervation induced by the surgery. They must arise from representational changes in the central somatosensory system. 5. These findings reveal that cortical maps can be altered in detail in adult monkeys by modifying the distributed temporal structure of afferent inputs. They support the longstanding hypothesis that the temporal coincidence of inputs plays a role in the grouping of input subsets into specific cortical RFs and, consequently, in the shaping of selected effective cortical inputs and representational topographies throughout life. C1 UNIV CALIF SAN FRANCISCO,MED CTR,DEPT OTOLARYNGOL,SAN FRANCISCO,CA 94143. UNIV CALIF SAN FRANCISCO,MED CTR,DEPT PHYSIOL,SAN FRANCISCO,CA 94143. RP ALLARD, T (reprint author), OFF NAVAL RES,COGNIT & NEUROL SCI 1142,800 N QUINCY ST,ARLINGTON,VA 22217, USA. RI Abbott, J./B-2976-2008 OI Abbott, J./0000-0001-6468-7284 FU NINDS NIH HHS [NS-10414] NR 53 TC 191 Z9 192 U1 1 U2 8 PU AMER PHYSIOLOGICAL SOC PI BETHESDA PA 9650 ROCKVILLE PIKE, BETHESDA, MD 20814 SN 0022-3077 J9 J NEUROPHYSIOL JI J. Neurophysiol. PD SEP PY 1991 VL 66 IS 3 BP 1048 EP 1058 PG 11 WC Neurosciences; Physiology SC Neurosciences & Neurology; Physiology GA GE056 UT WOS:A1991GE05600030 PM 1753275 ER PT J AU WU, CT AF WU, CT TI STEPS TOWARD INCREASING RELIABILITY SO JOURNAL OF OBJECT-ORIENTED PROGRAMMING LA English DT Article C1 USN,POSTGRAD SCH,DEPT COMP SCI,MONTEREY,CA 93943. NR 0 TC 0 Z9 0 U1 0 U2 0 PU SIGS PUBLICATIONS INC PI NEW YORK PA 588 BROADWAY SUITE 604, NEW YORK, NY 10012-5408 SN 0896-8438 J9 J OBJECT-ORIENT PROG JI J. Object-Oriented Program. PD SEP PY 1991 VL 4 IS 5 BP 64 EP 66 PG 3 WC Computer Science, Software Engineering; Computer Science, Theory & Methods SC Computer Science GA GG381 UT WOS:A1991GG38100010 ER PT J AU WOOLDRIDGE, RC NETZER, DW AF WOOLDRIDGE, RC NETZER, DW TI IGNITION AND FLAMMABILITY CHARACTERISTICS OF SOLID FUEL RAMJETS SO JOURNAL OF PROPULSION AND POWER LA English DT Note RP WOOLDRIDGE, RC (reprint author), USN,POSTGRAD SCH,DEPT AERONAUT & ASTRONAUT,MONTEREY,CA 93943, USA. NR 8 TC 4 Z9 4 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 SEP-OCT PY 1991 VL 7 IS 5 BP 846 EP 848 DI 10.2514/3.23400 PG 3 WC Engineering, Aerospace SC Engineering GA GG764 UT WOS:A1991GG76400025 ER PT J AU CHANDLER, P CODDINGTON, CC HANSEN, K TOLLISON, S AF CHANDLER, P CODDINGTON, CC HANSEN, K TOLLISON, S TI GYNECOLOGIC SURGERY AFTER REPAIR OF GASTROSCHISIS OR OMPHALOCELE - A REPORT OF 2 CASES SO JOURNAL OF REPRODUCTIVE MEDICINE LA English DT Article ID ABDOMINAL-WALL; PRENATAL-DIAGNOSIS; MANAGEMENT; ULTRASONOGRAPHY; EXOMPHALOS; FETUS AB Anterior abdominal wall defects, omphalocele and gastroschisis are rare fetal anomalies. Prenatal diagnosis of these conditions has improved with the widespread use of ultrasound and serum alpha-fetoprotein and amniotic fluid cholinesterase levels. Improvements in prenatal diagnosis have allowed appropriate and timely intensive care and surgical intervention, reducing morbidity and mortality. As more of these infants survive, gynecologists will more frequently encounter them as adults with a condition requiring surgical correction. Two cases demonstrate that well-planned surgery can maximize the outcome for these patients. C1 USN,PORTSMOUTH HOSP,PORTSMOUTH,VA. EASTERN VIRGINIA MED SCH,DEPT OBSTET & GYNECOL,NORFOLK,VA 23501. USN,BEAUFORT NAVAL HOSP,BEAUFORT,SC. NR 21 TC 0 Z9 0 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 SEP PY 1991 VL 36 IS 9 BP 679 EP 682 PG 4 WC Obstetrics & Gynecology SC Obstetrics & Gynecology GA GG475 UT WOS:A1991GG47500014 PM 1837802 ER PT J AU KNOWLES, SH AF KNOWLES, SH TI ORBITAL ELEMENTS DETERMINATION FOR BREAKUP AND DEBRIS SO JOURNAL OF SPACECRAFT AND ROCKETS LA English DT Article AB This paper describes the general procedures and resources required for a determination of specific orbits of space debris resulting from satellite breakups and other causes. The initial coincidence of all pieces combined with the limited discrimination ability of tracking radars causes confusion in this process. The Naval Space Surveillance Center uses a technique called blast-point analysis to analyze the orbits of specific debris pieces as rapidly as possible. The details of this procedure are described, together with practical factors involved in actual breakup events. Evidence of fragment behavior is presented from the breakups of COSMOS 1823, TIROS N, and two other COSMOS satellites. Typical numbers of trackable pieces are 100-300. Typical fragment relative velocities range from 5 to 125 m/s, with an average value near 50 m/s. Evidence is presented to confirm the generally accepted model of near-term debris behavior that shows a secular dispersion in the along-track direction, with more strictly cyclical behavior in the cross-track component. RP KNOWLES, SH (reprint author), USN,CTR SPACE SURVEILLANCE,DAHLGREN,VA 22448, USA. NR 5 TC 0 Z9 0 U1 0 U2 0 PU AMER INST AERONAUT ASTRONAUT PI RESTON PA 1801 ALEXANDER BELL DRIVE, STE 500, RESTON, VA 22091 SN 0022-4650 J9 J SPACECRAFT ROCKETS JI J. Spacecr. Rockets PD SEP-OCT PY 1991 VL 28 IS 5 BP 587 EP 591 DI 10.2514/3.26284 PG 5 WC Engineering, Aerospace SC Engineering GA GM559 UT WOS:A1991GM55900016 ER PT J AU JACOBSEN, M AF JACOBSEN, M TI CHURCHILL,WINSTON AND THE 3RD FRONT SO JOURNAL OF STRATEGIC STUDIES LA English DT Article RP JACOBSEN, M (reprint author), USN,CTR HIST,WASHINGTON,DC 20350, USA. NR 24 TC 4 Z9 4 U1 0 U2 0 PU FRANK CASS CO LTD PI LONDON PA 11 GAINSBOROUGH ROAD, LONDON, ENGLAND E11 1RS SN 0140-2390 J9 J STRATEGIC STUD JI J. Strateg. Stud. PD SEP PY 1991 VL 14 IS 3 BP 337 EP 362 DI 10.1080/01402399108437455 PG 26 WC International Relations; Political Science SC International Relations; Government & Law GA GU332 UT WOS:A1991GU33200003 ER PT J AU BUSLOV, VM SCOLA, PT AF BUSLOV, VM SCOLA, PT TI INSPECTION AND STRUCTURAL EVALUATION OF TIMBER PIER - CASE-STUDY SO JOURNAL OF STRUCTURAL ENGINEERING-ASCE LA English DT Article AB The paper is based on the results of a detailed underwater survey conducted in 1989 on the United States Navy timber pier in upper San Francisco Bay. The survey was performed within the framework of the large multiyear program set up by the U.S. Navy for the inspection and maintenance of its facilities worldwide. The paper describes causes of damage, its type and location, methods of quantitative structural evaluation, and repair strategy. Inspection findings indicated a very substantial upsurge in marine borer activity, which effectively put the 45-yr-old pier out of service during the last decade. Analysis of the dynamics of pile deterioration became possible due to continuous follow-up observations. It clearly demonstrated the advantages of the multiyear inspection program. Structural evaluation revealed that partial replacement of timber piles infested by marine borers should be made using regular pattern, regardless of the observed local condition of timber piles at the time of inspection. C1 USN,FACILITIES ENGN COMMAND,DIV CHESAPEAKE,WASHINGTON,DC 20374. RP BUSLOV, VM (reprint author), HAN PADRON ASSOC,NEW YORK,NY 10001, USA. NR 4 TC 0 Z9 0 U1 0 U2 0 PU ASCE-AMER SOC CIVIL ENG PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2398 SN 0733-9445 J9 J STRUCT ENG-ASCE JI J. Struct. Eng.-ASCE PD SEP PY 1991 VL 117 IS 9 BP 2725 EP 2741 DI 10.1061/(ASCE)0733-9445(1991)117:9(2725) PG 17 WC Construction & Building Technology; Engineering, Civil SC Construction & Building Technology; Engineering GA GD350 UT WOS:A1991GD35000010 ER PT J AU WOOD, FW AF WOOD, FW TI DESIGN AND ANALYSIS OF JAW CRUSHER GOUGING ABRASION TESTS - DISCUSSION SO JOURNAL OF TESTING AND EVALUATION LA English DT Discussion RP WOOD, FW (reprint author), USN,AVIAT DEPOT,NAVAL AIR STN,JACKSONVILLE,FL 32212, USA. NR 0 TC 1 Z9 1 U1 0 U2 1 PU AMER SOC TESTING MATERIALS PI W CONSHOHOCKEN PA 100 BARR HARBOR DR, W CONSHOHOCKEN, PA 19428-2959 SN 0090-3973 J9 J TEST EVAL JI J. Test. Eval. PD SEP PY 1991 VL 19 IS 5 BP 408 EP 409 PG 2 WC Materials Science, Characterization & Testing SC Materials Science GA GD764 UT WOS:A1991GD76400010 ER PT J AU LEEK, MR HANNA, TE MARSHALL, L AF LEEK, MR HANNA, TE MARSHALL, L TI AN INTERLEAVED TRACKING PROCEDURE TO MONITOR UNSTABLE PSYCHOMETRIC FUNCTIONS SO JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA LA English DT Article ID ADAPTIVE PSYCHOPHYSICAL PROCEDURES AB In some experimental situations, the psychometric function underlying performance may not be stable, but instead may shift along the stimulus axis in response to changes in attention, learning, or task difficulty. When this occurs, the measured threshold may be influenced and the slope of the measured function will be inaccurately shallow. With commonly used experimental procedures, it is difficult to know whether a shallow psychometric function slope is a true reflection of the sensory process, or is a result of "averaging" a highly variable underlying function. Here, a new method is described of estimating psychometric function slope from the variability in two interleaved adaptive tracks, consulted on alternate trials, that is resistant to the effects of shifting performance levels. Further, a mechanism is described for assessing the likelihood that a threshold was, in fact, stable over the course of its measurement. Computer simulations are reported as well as verification of the method in measurements of human performance on a psychophysical task. Several conditions of externally imposed variability were simulated to establish the ability of these procedures to identify unstable functions and produce accurate slope estimates. The procedures worked well for thresholds shifting by as little as 4 dB if the variation did not occur too rapidly. The procedure and associated analyses are recommended as a relatively "free" means of calculating slope and quantifying threshold reliability with little extra experimental effort. C1 USN,SUBMARINE MED RES LAB,GROTON,CT 06349. RP LEEK, MR (reprint author), WALTER REED ARMY MED CTR,CTR AUDIOL & SPEECH,WASHINGTON,DC 20307, USA. NR 10 TC 13 Z9 13 U1 0 U2 1 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0001-4966 J9 J ACOUST SOC AM JI J. Acoust. Soc. Am. PD SEP PY 1991 VL 90 IS 3 BP 1385 EP 1397 DI 10.1121/1.401930 PG 13 WC Acoustics; Audiology & Speech-Language Pathology SC Acoustics; Audiology & Speech-Language Pathology GA GE466 UT WOS:A1991GE46600018 PM 1939903 ER PT J AU COLLINS, MD KUPERMAN, WA AF COLLINS, MD KUPERMAN, WA TI FOCALIZATION - ENVIRONMENTAL FOCUSING AND SOURCE LOCALIZATION SO JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA LA English DT Article ID RANGE-DEPENDENT ENVIRONMENT; MATCHED-FIELD LOCALIZATION; WATER PACIFIC ENVIRONMENT; ADIABATIC MODE THEORY; SHALLOW-WATER; VERTICAL ARRAY; ACOUSTIC PROPAGATION; STRATIFIED OCEAN; DEPTH ESTIMATION; MISMATCH AB Conventional matched-field processing (MFP) requires accurate knowledge of the ocean-acoustic environment. Focalization, which simultaneously focuses and localizes, eliminates this stringent requirement by including the environment in the parameter search space. This generalization of MFP involves defining an appropriate high-resolution cost function, parametrizing the search space of the environment and source, constructing solutions of the wave equation, and utilizing a nonlinear optimization method to search the parameter landscape for the global minimum of the cost function. Focalization is implemented using cost functions based on ray theory and wave theory, empirical orthogonal functions for the environmental description, and simulated annealing for optimization. Numerical simulations are presented to demonstrate the feasibility of focalization. RP COLLINS, MD (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 50 TC 156 Z9 161 U1 1 U2 4 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 SEP PY 1991 VL 90 IS 3 BP 1410 EP 1422 DI 10.1121/1.401933 PG 13 WC Acoustics; Audiology & Speech-Language Pathology SC Acoustics; Audiology & Speech-Language Pathology GA GE466 UT WOS:A1991GE46600021 PM 1939906 ER PT J AU DUBBELDAY, PS FAUSETT, LV AF DUBBELDAY, PS FAUSETT, LV TI CONSTRAINED-LAYER DAMPING ANALYSIS FOR FLEXURAL WAVES IN INFINITE FLUID-LOADED PLATES SO JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA LA English DT Article AB In an early model by Kerwin [J. Acoust. Soc. Am. 31, 952-962 (1959)] for constrained-layer damping (CLD) of flexural waves in an infinite plate, the attenuation factor was expressed in terms of the material and geometric parameters of the three constituting layers, thus facilitating optimization studies. The Kerwin model is limited to flexural waves in thin plates and does not account for fluid loading. To remedy these restrictions, the model was extended in an earlier study [P. S. Dubbelday, J. Acoust. Soc. Am. 80, 1097-1102 (1986)] while maintaining an explicit algebraic relation between the attenuation constant and the physical and geometric parameters typical of the Kerwin model. To establish the correctness of the modification, a hybrid model was developed that treats the base plate by exact elasticity theory while describing the effect of the two additional layers according to the Kerwin model. An analysis based on applying exact elasticity theory to all three layers, with fluid loading on either or both sides, is described. The influence of fluid-plate interaction on damping efficiency is discussed. The various models are compared and discrepancies noted. The hybrid and exact models necessitate finding complex roots of transcendental equations by numerical computation, thus losing direct insight into the effect of the parameters on the attenuation offered by an explicit algebraic expression, a major advantage of the Kerwin model. It is concluded that the extended Kerwin model is quite useful for optimization of the CLD technique. However, a check by means of the hybrid or exact models may be necessary in view of the limitations of the extended Kerwin model. C1 FLORIDA INST TECHNOL,DEPT APPL MATH,MELBOURNE,FL 32901. RP DUBBELDAY, PS (reprint author), USN,RES LAB,UNDERWATER SOUND REFERENCE DETACHMENT,POB 568337,ORLANDO,FL 32856, USA. NR 10 TC 4 Z9 4 U1 0 U2 1 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0001-4966 J9 J ACOUST SOC AM JI J. Acoust. Soc. Am. PD SEP PY 1991 VL 90 IS 3 BP 1475 EP 1487 DI 10.1121/1.402383 PG 13 WC Acoustics; Audiology & Speech-Language Pathology SC Acoustics; Audiology & Speech-Language Pathology GA GE466 UT WOS:A1991GE46600029 ER PT J AU MANN, JA WILLIAMS, E WASHBURN, K GROSH, K AF MANN, JA WILLIAMS, E WASHBURN, K GROSH, K TI TIME-DOMAIN ANALYSIS OF THE ENERGY EXCHANGE BETWEEN STRUCTURAL VIBRATIONS AND ACOUSTIC RADIATION USING NEAR-FIELD ACOUSTICAL-HOLOGRAPHY MEASUREMENTS SO JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA LA English DT Article AB The vibrational energy in a structure and the radiated acoustic energy are analyzed in the time domain using data from near-field acoustical holography measurements. A signal processing method is described that uses data from a single broadband acoustical holography measurement to determine the structural and acoustic responses for synthetic forces different from the original measurement force. The processing is based on the assumption that the measured acoustic pressure and particle velocity are related to the drive force by a linear shift invariant transfer function. Finite time length synthetic forces are examined for measurements from a fluid-loaded, point-driven, finite cylindrical shell. Comparisons of the amount of energy input to the structure by the driver, the energy injected into the fluid near field, and the energy radiated to the fluid far field show large amounts of energy that enter the fluid near field while the drive force is on, but then reenter the structure where it is damped once the drive force is turned off. Also seen are the rate that energy radiates to the acoustic far field and the areas of the structure which contribute most significantly to the far-field radiation. Results show that approximately 50% of the far-field energy is radiated during the active time of a transient driving force. C1 USN,RES LAB,WASHINGTON,DC 20375. SFA INC,LANDOVER,MD 20785. RP MANN, JA (reprint author), IOWA STATE UNIV SCI & TECHNOL,DEPT AEROSP ENGN & ENGN MECH,AMES,IA 50011, USA. OI Grosh, Karl/0000-0001-8704-6199 NR 7 TC 12 Z9 12 U1 0 U2 0 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0001-4966 J9 J ACOUST SOC AM JI J. Acoust. Soc. Am. PD SEP PY 1991 VL 90 IS 3 BP 1656 EP 1664 DI 10.1121/1.401906 PG 9 WC Acoustics; Audiology & Speech-Language Pathology SC Acoustics; Audiology & Speech-Language Pathology GA GE466 UT WOS:A1991GE46600049 ER PT J AU NOELLER, KR ADAMS, SE AF NOELLER, KR ADAMS, SE TI BILATERAL STYLOID FRACTURE - A CASE-REPORT SO JOURNAL OF THE AMERICAN PODIATRIC MEDICAL ASSOCIATION LA English DT Article RP NOELLER, KR (reprint author), USN HOSP,MED SERV CORPS,PODIATR SURG RESIDENCY TRAINING PROGRAM,CAMP PENDLETON,CA 92055, USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER PODIATRIC MED ASSN PI BETHESDA PA 9312 OLD GEORGETOWN ROAD, BETHESDA, MD 20814-1621 SN 0003-0538 J9 J AM PODIAT MED ASSN JI J. Am. Podiatr. Med. Assoc. PD SEP PY 1991 VL 81 IS 9 BP 498 EP 501 PG 4 WC Orthopedics SC Orthopedics GA GF679 UT WOS:A1991GF67900007 PM 1748967 ER PT J AU ABRAHAM, MH HAMERTON, I ROSE, JB GRATE, JW AF ABRAHAM, MH HAMERTON, I ROSE, JB GRATE, JW TI HYDROGEN-BONDING .18. GAS-LIQUID-CHROMATOGRAPHIC MEASUREMENTS FOR THE DESIGN AND SELECTION OF SOME HYDROGEN-BOND ACIDIC PHASES SUITABLE FOR USE AS COATINGS ON PIEZOELECTRIC SORPTION DETECTORS SO JOURNAL OF THE CHEMICAL SOCIETY-PERKIN TRANSACTIONS 2 LA English DT Article ID ACOUSTIC-WAVE DEVICES; PARTITION-COEFFICIENTS; PATTERN-RECOGNITION; STATIONARY PHASES; RESPONSES; SET AB A number of involatile liquids based on 4,4'-isopropylidenediphenol (bisphenol-A) or other bisphenols have been prepared as candidate coatings for piezoelectric sorption detectors. The liquids have been used as GLC stationary phases, and gas-liquid partition coefficients of a series of solutes have been obtained for these phases. Application of the linear solvation energy equation below has revealed that two particular liquids (8 and 9) possess very large hydrogen bond acidities coupled to rather small hydrogen bond basicities, and hence might be suitable as coatings with selectivity towards solutes that are hydrogen bond bases. One other compound (10) is not suitable as a coating because it is a solid at room temperature, but it has very considerable hydrogen bond acidity, and may be suitable as a novel GLC stationary phase. In the linear solution log K = c + rR2 + s-pi-2H + a-alpha-2H + b-beta-2H + / log L16 energy equation above, K is the gas-liquid partition coefficient for a series of solutes on a given phase, and the explanatory variables R2, pi-2H, alpha-2H, beta-2H and log L16 are solute parameters that we have described before. A term by term analysis of the equation can be used to evaluate quantitatively how specific solute-solvent interactions influence the magnitude of the various log K values. C1 UNIV SURREY, DEPT CHEM, GUILDFORD GU2 5XH, SURREY, ENGLAND. USN, RES LAB, DIV CHEM, WASHINGTON, DC 20375 USA. RP UNIV LONDON UNIV COLL, DEPT CHEM, 20 GORDON ST, LONDON WC1H 0AJ, ENGLAND. NR 18 TC 50 Z9 50 U1 2 U2 5 PU ROYAL SOC CHEMISTRY PI CAMBRIDGE PA THOMAS GRAHAM HOUSE, SCIENCE PARK, MILTON RD, CAMBRIDGE CB4 0WF, CAMBS, ENGLAND SN 1472-779X J9 J CHEM SOC PERK T 2 JI J. Chem. Soc.-Perkin Trans. 2 PD SEP PY 1991 IS 9 BP 1417 EP 1423 DI 10.1039/p29910001417 PG 7 WC Chemistry, Organic; Chemistry, Physical SC Chemistry GA GF285 UT WOS:A1991GF28500017 ER PT J AU BASHKANSKY, M REINTJES, J AF BASHKANSKY, M REINTJES, J TI INCOHERENT MULTIMODE RAMAN AMPLIFICATION THEORY SO JOURNAL OF THE OPTICAL SOCIETY OF AMERICA B-OPTICAL PHYSICS LA English DT Article ID GAIN ENHANCEMENT; AMPLIFIERS; STOKES; SCATTERING; BEAMS AB We develop an analytic theory for multi-longitudinal-mode Raman amplification with an incoherent pump of arbitrary bandwidth and mode spacing in the limit of negligible pump depletion. The closed-form analytical solution assumes the correct form in the limit for which the longitudinal laser mode spacing is wide in relation to the Raman bandwidth. The theory also predicts an enhancement in gain for correlated pump and Stokes beams when the laser mode spacing is much smaller than the Raman linewidth. RP BASHKANSKY, M (reprint author), USN,RES LAB,DIV OPT SCI,LASER PHYS BRANCH,CODE 6540,WASHINGTON,DC 20375, USA. NR 16 TC 5 Z9 5 U1 0 U2 1 PU OPTICAL SOC AMER PI WASHINGTON PA 2010 MASSACHUSETTS AVE NW, WASHINGTON, DC 20036 SN 0740-3224 J9 J OPT SOC AM B JI J. Opt. Soc. Am. B-Opt. Phys. PD SEP PY 1991 VL 8 IS 9 BP 1843 EP 1845 DI 10.1364/JOSAB.8.001843 PG 3 WC Optics SC Optics GA GD766 UT WOS:A1991GD76600010 ER PT J AU CHOBAN, PS WEIRETER, LJ MAYNES, C AF CHOBAN, PS WEIRETER, LJ MAYNES, C TI OBESITY AND INCREASED MORTALITY IN BLUNT TRAUMA SO JOURNAL OF TRAUMA-INJURY INFECTION AND CRITICAL CARE LA English DT Article; Proceedings Paper CT 4TH ANNUAL SCIENTIFIC ASSEMBLY OF THE EASTERN ASSOC FOR SURGERY OF TRAUMA CY JAN 17-19, 1991 CL LONGBOAT KEY, FL SP E ASSOC SURG TRAUMA ID FREE FATTY-ACID; HEALTH; RISKS AB To determine the effect of admission body weight on blunt trauma victims, a chart review of all patients > 12 years of age admitted to Sentara Norfolk General Hospital between January 1 and July 31, 1987 was undertaken. The charts of 351 patients were reviewed; 184 records contained admission height and weight. These 184 patients made up the study group and age, gender, injuries, Injury Severity Score (ISS), ventilator days (VD), complications, length of stay (LOS), and outcome were noted. Body Mass Index (BMI) (weight (kg)/(height (m))2, was calculated for each patient. The average ISS was 21.87 (range, 1-66) and the average BMI was 25.15 kg/m2 (range, 16-46 kg/m2). The overall mortality for the population was 9%. The population was grouped according to BMI: average (< 27 kg/m2), overweight (27-31 kg/m2), and severely overweight (> 31 kg/m2). The mortality of 5.0% and 8.0% in the average and overweight groups was not different. The severely overweight group had a higher mortality at 42.1% compared with the other two groups (p < 0.0001). The groups did not differ in age, ISS, LOS, nor VD. Age, BMI, and ISS were subjected to regression analysis. By this method BMI and ISS were independent determinants of outcome (p < 0.0001). There was an increase in complications, mainly pulmonary problems, in the SO group (p < 0.05). The three groups were subdivided into survivors and nonsurvivors. The nonsurvivors had a longer average LOS at 26.6 days compared with nonsurvivors in the overweight (5.0 days) or severely overweight (8.62 days) groups (p < 0.007). The severely overweight group was characterized by a rapid deterioration and demise that was unresponsive to intervention. ISS did not differ among nonsurvivors. Among survivors the severely overweight group had a lower ISS, 9.73. This was different from the overweight group (21.57) and from the average group (20.21) (p < 0.04). C1 EASTERN VIRGINIA MED SCH,DEPT SURG,825 FAIRFAX AVE,SUITE 656,NORFOLK,VA 23507. USN HOSP,SURG CLIN,JACKSONVILLE,FL. SENTARA NORFOLK GEN HOSP,NORFOLK,VA. NR 12 TC 100 Z9 104 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 SEP PY 1991 VL 31 IS 9 BP 1253 EP 1257 DI 10.1097/00005373-199109000-00009 PG 5 WC Critical Care Medicine; Surgery SC General & Internal Medicine; Surgery GA GH567 UT WOS:A1991GH56700010 PM 1920556 ER PT J AU BURKS, DD STAINKEN, BF BURKHARD, TK BALSARA, ZN AF BURKS, DD STAINKEN, BF BURKHARD, TK BALSARA, ZN TI UTERINE INNER MYOMETRIAL ECHOGENIC FOCI - RELATIONSHIP TO PRIOR DILATATION AND CURETTAGE AND ENDOCERVICAL BIOPSY SO JOURNAL OF ULTRASOUND IN MEDICINE LA English DT Article ID TRANS-VAGINAL SONOGRAPHY; ENDOMETRIAL AB The frequent presence of small echogenic foci within the inner myometrium in women who have had prior uterine instrumentation is reported. Bright foci were observed in 35 of 80 patients who had had prior dilatation and curettage or endocervical biopsy and in only 2 of 174 patients who gave no history of either procedure (P < 0.005). These foci tend to be small (3 to 6 mm), linear, usually nonshadowing, single or multiple, and located immediately adjacent to the endometrium anywhere along the length of the endometrial cavity; they can be seen many years after the procedure was performed. The histopathologic features of these foci are unconfirmed, but we suspect they represent calcification or fibrosis at sites of mechanical injury to myometrium. The presence of these foci serves as a marker of prior instrumentation and probably has no clinical significance. However, sonographers who are aware of their possible occurrence, can avoid mistaking them for leiomyoma calcifications or for air in the endometrium or myometrium in patients with suspected endometritis. C1 USN HOSP,DEPT CLIN INVEST,SAN DIEGO,CA 92134. USN HOSP,DEPT RADIOL,SAN DIEGO,CA 92134. NR 16 TC 3 Z9 3 U1 0 U2 0 PU AMER INST ULTRASOUND MEDICINE PI LAUREL PA SUBSCRIPTION DEPT, 14750 SWEITZER LANE, STE 100, LAUREL, MD 20707-5906 SN 0278-4297 J9 J ULTRAS MED JI J. Ultrasound Med. PD SEP PY 1991 VL 10 IS 9 BP 487 EP 492 PG 6 WC Acoustics; Radiology, Nuclear Medicine & Medical Imaging SC Acoustics; Radiology, Nuclear Medicine & Medical Imaging GA GD382 UT WOS:A1991GD38200004 PM 1920589 ER PT J AU NOLAN, JF STILLWELL, TJ BARTTELBORT, SW SANDS, JP AF NOLAN, JF STILLWELL, TJ BARTTELBORT, SW SANDS, JP TI URETHROVAGINAL RECONSTRUCTION USING A PERINEAL ARTERY AXIAL FLAP SO JOURNAL OF UROLOGY LA English DT Article DE CLOACA; BIRTH DEFECTS; UROGENITAL SYSTEM; VAGINA; URETHRA AB A 19-year-old woman was born with a cloacal malformation and a common urogenital sinus. We describe a method of urethral and vaginal reconstruction to correct these anomalous problems. A neourethra was constructed from tubularized anterior vaginal epithelium. A perineal artery based axial flap was used to cover the neourethra plus widen the vaginal orifice. C1 USN HOSP,DEPT UROL,SAN DIEGO,CA 92134. USN HOSP,DEPT GEN SURG,DIV PLAST SURG,SAN DIEGO,CA 92134. RP NOLAN, JF (reprint author), USN HOSP,DEPT CLIN INVEST,SAN DIEGO,CA 92134, USA. NR 4 TC 0 Z9 0 U1 0 U2 0 PU WILLIAMS & WILKINS PI BALTIMORE PA 351 WEST CAMDEN ST, BALTIMORE, MD 21201-2436 SN 0022-5347 J9 J UROLOGY JI J. Urol. PD SEP PY 1991 VL 146 IS 3 BP 843 EP 844 PG 2 WC Urology & Nephrology SC Urology & Nephrology GA GD343 UT WOS:A1991GD34300045 PM 1875508 ER PT J AU PALMER, CJ SCHROEDER, JP FUJIOKA, RS DOUGLAS, JT AF PALMER, CJ SCHROEDER, JP FUJIOKA, RS DOUGLAS, JT TI STAPHYLOCOCCUS-AUREUS INFECTION IN NEWLY CAPTURED PACIFIC BOTTLE-NOSED DOLPHINS (TURSIOPS-TRUNCATUS-GILLI) SO JOURNAL OF ZOO AND WILDLIFE MEDICINE LA English DT Article DE STAPHYLOCOCCUS-AUREUS; BACTERIAL INFECTIONS; PACIFIC BOTTLE-NOSED DOLPHIN; TURSIOPS-TRUNCATUS-GILLI ID DISEASES AB Four newly captured Pacific bottlenose dolphins (Tursiops truncatus gilli) were housed in coastal seapens in Oahu, Hawaii. One of the dolphins died 9 days postcapture, and another died 46 days postcapture. Staphylococcus aureus was recovered in pure culture from internal organs from both dolphins and apparently caused their deaths. Dolphin pen water, other resident dolphins, and human handlers were analyzed to determine the source of the infection. Staphylococcus aureus was recovered from dolphin pen water in concentrations of 12 colony-forming units (CFU)/ 100 ml. One animal handler was a nasal carrier of S. aureus. Two resident dolphins had S. aureus in their blowholes. Antibiograms, enterotoxin production, and phage typing were performed on S. aureus recovered from dolphins, water, and humans to determine if the strains were the same. Antibiograms and enterotoxin production were not useful in establishing the source of S. aureus. Phage typing, however, was useful for determining the different isolates of S. aureus. One newly captured dolphin was infected with strain 55/3A. The second newly captured dolphin was infected with strain 6/29/47/52/54/7 5/77/79. One of the resident dolphins and another newly captured dolphin had S. aureus strains in their blowholes similar to those recovered from one of the dead dolphins. The nasal isolates from human handlers were not; typeable. Staphylococcus aureus isolates recovered from seapen water were phage type 29/54/71/80/96 or 29/52/83A but were not the same strains as the dolphin isolates. C1 UNIV HAWAII,DEPT MICROBIOL,HONOLULU,HI 96822. USN,CTR OCEAN SYST,KAILUA,HI 96734. NR 18 TC 2 Z9 2 U1 0 U2 0 PU AMER ASSOC Z00 VETERINARIANS PI MEDIA PA 6 NORTH PENNELL ROAD, MEDIA, PA 19063 SN 1042-7260 J9 J ZOO WILDLIFE MED JI J. Zoo Wildl. Med. PD SEP PY 1991 VL 22 IS 3 BP 330 EP 338 PG 9 WC Veterinary Sciences SC Veterinary Sciences GA GL344 UT WOS:A1991GL34400007 ER PT J AU SONNENSCHEIN, MF PACE, MD AF SONNENSCHEIN, MF PACE, MD TI DEPTH PROFILE STUDIES OF DC23PC BILAYER STRUCTURE USING A MULTIDISCIPLINE APPROACH SO LANGMUIR LA English DT Article ID LIQUID-CRYSTALLINE SOLVENTS; SPIN-RESONANCE-SPECTRA; PYRENE FLUORESCENCE; MECHANISTIC PROBES; PHASE-BEHAVIOR; MICELLES; MEMBRANES; OXYGEN; LABELS; MICROSTRUCTURES AB Four spectroscopic techniques have been utilized to obtain information on the depth-dependent structure of five morphological modifications of the phosphatidylcholine derivative DC23PC. Static and dynamic fluorescence data from three structurally related probe molecules ((1-pyrenyl)acetic acid, 4-(1-pyrenyl)-butanoic acid, and 12-(1-pyrenyl)dodecanoic acid) were employed to determine the influence of the temperature dependent phase structure on oxygen and water permeability in small unilamellar vesicles and microtubules. Electron spin resonance spectra of 5-, 12-, and 16-(4,4-dimethyl-3-oxazolidinyloxy)stearic (16-doxylstearic acid) (triviallyl named 5, 12-, and 16-DSAL) and 1-palmitoyl-2-(12-doxylstearoyl)-phosphatidylcholine spin labels were used as probes of gel-phase, tubule, and small unilamellar vesicle membrane fluidity as a function of temperature and phase. High-power deuterium NMR using deuterium enriched 1,2-bis(hexadecanoyl)-sn-glycero-3-phosphocholine was employed as a probe of the temperature-and phase-dependent fludity of the gel-phase DC23PC lipid along with the tubule and chain-melted lipid bilayer structures. RP SONNENSCHEIN, MF (reprint author), USN,RES LAB,POLYMER MAT BRANCH,CODE 6120,WASHINGTON,DC 20375, USA. NR 66 TC 1 Z9 1 U1 0 U2 1 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0743-7463 J9 LANGMUIR JI Langmuir PD SEP PY 1991 VL 7 IS 9 BP 1880 EP 1891 DI 10.1021/la00057a011 PG 12 WC Chemistry, Multidisciplinary; Chemistry, Physical; Materials Science, Multidisciplinary SC Chemistry; Materials Science GA GG466 UT WOS:A1991GG46600011 ER PT J AU GILMORE, EM AF GILMORE, EM TI COMPLETE THEATER - SPANISH - WOLFF,E SO LATIN AMERICAN THEATRE REVIEW LA English DT Book Review RP GILMORE, EM (reprint author), USN ACAD,ANNAPOLIS,MD 21402, USA. NR 1 TC 0 Z9 0 U1 0 U2 0 PU UNIV KANSAS PI LAWRENCE PA CENTER FOR LATIN AMER STUDIES, LAWRENCE, KS 66045 SN 0023-8813 J9 LAT AM THEATRE REV JI Lat. Am. Theat. Rev. PD FAL PY 1991 VL 25 IS 1 BP 180 EP 182 PG 3 WC Theater SC Theater GA GX331 UT WOS:A1991GX33100030 ER PT J AU SAXENA, N HOTTA, K TALKINGTON, H SAIJO, O HOPLEY, D HARMON, J AF SAXENA, N HOTTA, K TALKINGTON, H SAIJO, O HOPLEY, D HARMON, J TI TECHNICAL REPORT OF THE 4TH PACIFIC CONGRESS ON MARINE SCIENCE AND TECHNOLOGY (PACON 90) SO MARINE TECHNOLOGY SOCIETY JOURNAL LA English DT Editorial Material C1 SEACO,SAIC,HONOLULU,HI. JAMES COOK UNIV N QUEENSLAND,TOWNSVILLE,QLD 4811,AUSTRALIA. NIHON UNIV,MATSUDO,CHIBA 271,JAPAN. USN,CTR OCEAN SYST,SAN DIEGO,CA 92152. NIHON UNIV,TOKYO 101,JAPAN. RP SAXENA, N (reprint author), UNIV HAWAII,HONOLULU,HI 96822, USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU MARINE TECHNOLOGY SOC INC PI WASHINGTON PA 1828 L ST NW 9TH FLOOR, WASHINGTON, DC 20036 SN 0025-3324 J9 MAR TECHNOL SOC J JI Mar. Technol. Soc. J. PD FAL PY 1991 VL 25 IS 3 BP 58 EP 63 PG 6 WC Engineering, Ocean; Oceanography SC Engineering; Oceanography GA GQ928 UT WOS:A1991GQ92800010 ER PT J AU STALICK, JK GOTAAS, JA CHENG, SF CULLEN, J CLARK, AE AF STALICK, JK GOTAAS, JA CHENG, SF CULLEN, J CLARK, AE TI CRYSTALLOGRAPHIC AND MAGNETIC-STRUCTURE OF PR2FE17N2.8 SO MATERIALS LETTERS LA English DT Article ID INTERMETALLIC COMPOUNDS; CRYSTAL AB A neutron Rietveld refinement study of nitrided Pr2Fe17 at room temperature and at 4 K shows that the basic Th2Zn17 structure is maintained, with the N atoms occupying the interstitial 9e sites. Pr2Fe17N2.8 is rhombohedral, space group R3mBAR, with a = 8.776(1) angstrom, c = 12.649(2) angstrom at 4 K and a = 8.794(1) angstrom, c = 12.668(2) angstrom at 295 K. At both temperatures the easy magnetization direction is perpendicular to the c axis. C1 USN, CTR SURFACE WARFARE, SILVER SPRING, MD 20903 USA. RP STALICK, JK (reprint author), NATL INST STAND & TECHNOL, DIV REACTOR RADIAT, GAITHERSBURG, MD 20899 USA. NR 20 TC 4 Z9 4 U1 0 U2 2 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0167-577X EI 1873-4979 J9 MATER LETT JI Mater. Lett. PD SEP PY 1991 VL 12 IS 1-2 BP 93 EP 96 DI 10.1016/0167-577X(91)90064-D PG 4 WC Materials Science, Multidisciplinary; Physics, Applied SC Materials Science; Physics GA GJ921 UT WOS:A1991GJ92100019 ER PT J AU CLARK, JB GARRETT, RK JUNGLING, TL VANDERMEER, RA VOLD, CL AF CLARK, JB GARRETT, RK JUNGLING, TL VANDERMEER, RA VOLD, CL TI EFFECT OF PROCESSING VARIABLES ON TEXTURE AND TEXTURE GRADIENTS IN TANTALUM SO METALLURGICAL TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE LA English DT Article ID DEEP DRAWING STEELS; ODF-ANALYSIS AB The effect of processing variables on the development of texture in commercially processed tantalum for deep drawing applications was investigated. Orientation distribution functions (ODFs) showed that tantalum processed with a deformation zone parameter less than one, after rolling and recrystallization, had a desirable {111} fiber texture through the plate thickness and also a fine grain size. For tantalum rolled with a deformation zone parameter greater than one and recrystallized, severe texture gradients formed which influenced the final recrystallized grain size. Orientation distribution function analysis indicated that a strong {001}<110> orientation developed in cross-rolled and recrystallized tantalum. The influence of processing variables on the final recrystallized texture and microstructure is discussed, but the deep drawability of the textured tantalum is not described. C1 USN,RES LAB,WASHINGTON,DC 20375. RP CLARK, JB (reprint author), USN,CTR SURFACE WARFARE,SILVER SPRING,MD 20903, USA. NR 14 TC 43 Z9 44 U1 0 U2 1 PU MINERALS METALS MATERIALS SOC PI WARRENDALE PA 420 COMMONWEALTH DR, WARRENDALE, PA 15086 SN 0360-2133 J9 METALL TRANS A PD SEP PY 1991 VL 22 IS 9 BP 2039 EP 2048 DI 10.1007/BF02669871 PG 10 WC Materials Science, Multidisciplinary SC Materials Science GA GD848 UT WOS:A1991GD84800014 ER PT J AU WEBB, DC NISENOFF, M AF WEBB, DC NISENOFF, M TI THE HIGH-TEMPERATURE SUPERCONDUCTIVITY SPACE EXPERIMENT SO MICROWAVE JOURNAL LA English DT Article RP WEBB, DC (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 0 TC 1 Z9 1 U1 0 U2 0 PU HORIZON HOUSE-MICROWAVE PI NORWOOD PA 685 CANTON ST, NORWOOD, MA 02062 SN 0192-6225 J9 MICROWAVE J JI Microw. J. PD SEP PY 1991 VL 34 IS 9 BP 85 EP & PG 0 WC Engineering, Electrical & Electronic; Telecommunications SC Engineering; Telecommunications GA GG222 UT WOS:A1991GG22200003 ER PT J AU ZENGEL, P AF ZENGEL, P TI ASSASSINATION AND THE LAW OF ARMED CONFLICT SO MILITARY LAW REVIEW LA English DT Article RP ZENGEL, P (reprint author), USN,WASHINGTON,DC 20350, USA. NR 23 TC 10 Z9 10 U1 0 U2 0 PU JUDGE ADVOCATE GENERALS SCHOOL PI CHARLOTTESVILLE PA US ARMY, CHARLOTTESVILLE, VA 22903-1781 SN 0026-4040 J9 MIL LAW REV JI Milit. Law Rev. PD FAL PY 1991 VL 134 BP 123 EP 155 PG 33 WC Law SC Government & Law GA GX767 UT WOS:A1991GX76700004 ER PT J AU CONNOLLY, JP BAEZ, SA AF CONNOLLY, JP BAEZ, SA TI ASTHMA IN THE NAVY AND MARINE CORPS SO MILITARY MEDICINE LA English DT Article AB Today, asthma is an increasing health problem in young Americans. In some cases, it can be quite difficult to diagnose. Many individuals enter military service each year with undiagnosed asthma, which subsequently limits their performance of duty. We review the patterns of asthma in children and yound adults and relate this to Navy and Marine Corps personnel. We also review the current evaluation of this disease in the U.S. Navy Medical Department and suggest future improvements in this evaluation. RP CONNOLLY, JP (reprint author), USN HOSP,DEPT CLIN INVEST,SAN DIEGO,CA 92134, USA. NR 0 TC 9 Z9 9 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 SEP PY 1991 VL 156 IS 9 BP 461 EP 465 PG 5 WC Medicine, General & Internal SC General & Internal Medicine GA GF506 UT WOS:A1991GF50600010 PM 1961427 ER PT J AU SMITH, RS AF SMITH, RS TI NONOPERATIVE MANAGEMENT OF HEPATIC-TRAUMA SO MILITARY MEDICINE LA English DT Article AB In an attempt to determine whether selective, nonoperative management of hepatic trauma might be efficacious, a retrospective review of liver injuries was undertaken. Of the 48 patients with liver injuries identified, there were 34 men and 14 women with an average age of 28.5 years. Mechanism of injury consisted of blunt trauma in 23 patients, stab wounds in 14 patients, and 11 patients had gunshot wounds. There were 12 grade I injuries, 15 grade II injuries, 17 grade III injuries, 2 grade IV injuries, and 1 grade V injury. Diagnosis of liver trauma was made at the time of exploratory laparotomy in 15 patients and suggested by abdominal computed tomography (CT) scan in 18 patients; the remaining 15 patients had a positive peritoneal lavage which led to exploratory laparotomy. Following blunt trauma, 14 patients, all of whom underwent diagnostic abdominal CT scans which confirmed hepatic injury, had nonoperative treatment. All patients who received nonoperative management maintained stable vital signs and only five required transfusion. None of the patients who were treated nonoperatively developed complications or required delayed laparotomy. There were no deaths in this group. Of the 34 patients undergoing exploratory laparotomy, 19 required either no treatment or minor hepatorrhaphy. However, 17 of 25 patients with penetrating wounds had associated abdominal injuries which required operative treatment. Based on the information obtained in this review, it is recommended that stable patients with isolated hepatic injuries, secondary to blunt trauma confirmed by CT scan, may be managed nonoperatively. Due to the high frequency of associated injuries found in patients with penetrating trauma, nonoperative therapy is not advised. RP SMITH, RS (reprint author), USN HOSP,DEPT GEN SURG,OAKLAND,CA 94627, USA. NR 0 TC 6 Z9 6 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 SEP PY 1991 VL 156 IS 9 BP 472 EP 474 PG 3 WC Medicine, General & Internal SC General & Internal Medicine GA GF506 UT WOS:A1991GF50600012 PM 1961429 ER PT J AU PAZZAGLIA, G ESCAMILLA, J BATCHELOR, R AF PAZZAGLIA, G ESCAMILLA, J BATCHELOR, R TI THE ETIOLOGY OF DIARRHEA AMONG AMERICAN ADULTS LIVING IN PERU SO MILITARY MEDICINE LA English DT Article AB During 1984-1989, 655 diarrheic and 287 nondiarrheic stool specimens from adult U.S. citizens living in Lima, Peru were tested for presence of bacterial enteropathogens. Frequencies of isolation among diarrheic specimens were: Shigella 9.8%; Campylobacter 6.1%; enterotoxigenic Escherichia coli (ETEC) 6.0%; Plesiomonas 2.0%; Salmonella 1.4%; and Vibrio 0.6%. Isolates recovered from non-diarrheic stools were: Shigella 4.5%; Campylobacter 2.1%; Salmonella 1.0%; ETEC 0.7%: Plesiomonas 0.7%; and Vibrio 0.3%. Aeromonas, an unproven cause of diarrhea, was isolated from 9.2% of cases and 3.5% of controls. Disease occurrence was strongly associated with isolation of Shigella, ETEC, Campylobacter, or Aeromonas (p less-than-or-equal-to 0.01). During the 6-year period of study, shifts in the dominant phenotypes of Shigella and Campylobacter occurred which may have important implications for vaccine development and intervention strategies. RP PAZZAGLIA, G (reprint author), USN,MED RES INST DETACHMENT,APO,MIAMI,FL 34031, USA. NR 0 TC 3 Z9 3 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 SEP PY 1991 VL 156 IS 9 BP 484 EP 487 PG 4 WC Medicine, General & Internal SC General & Internal Medicine GA GF506 UT WOS:A1991GF50600015 PM 1961431 ER PT J AU WEINSTEIN, ML AF WEINSTEIN, ML TI MOBILIZATION - A PHYSICAL-THERAPISTS PERSPECTIVE SO MILITARY MEDICINE LA English DT Letter RP WEINSTEIN, ML (reprint author), USN HOSP,CHERRY POINT,NC, 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 SEP PY 1991 VL 156 IS 9 BP A6 EP A6 PG 1 WC Medicine, General & Internal SC General & Internal Medicine GA GF506 UT WOS:A1991GF50600001 PM 1961419 ER PT J AU WOODGATE, R LEVINE, AS KOCH, WH CEBULA, TA EISENSTADT, E AF WOODGATE, R LEVINE, AS KOCH, WH CEBULA, TA EISENSTADT, E TI INDUCTION AND CLEAVAGE OF SALMONELLA-TYPHIMURIUM UMUD PROTEIN SO MOLECULAR & GENERAL GENETICS LA English DT Article DE ESCHERICHIA-COLI UMUD, UMUD'; IMMUNODETECTION; CHEMILUMINESCENCE; SOS MUTAGENESIS ID ESCHERICHIA-COLI; DNA-REPAIR; UV-MUTAGENESIS; ULTRAVIOLET-LIGHT; SOS MUTAGENESIS; OPERON; RECA; LT2; MUTANTS; GENE AB SOS mutagenesis in prokaryotes is dependent upon the inducible activity of the chromosomally encoded UmuDC proteins, or homologous proteins such as MucAB or ImpCAB which are found on naturally occurring plasmids. Relative to Escherichia coli, however, Salmonella typhimurium is much less responsive to the mutagenic effects of DNA-damaging agents, despite the fact that it possesses both chromosomally and plasmid encoded umu-like operons. In E. coli, activation of the UmuD mutagenesis protein to UmuD' via RecA-mediated proteolysis is a critical step in the mutation fixation pathway. We have used a polyclonal antiserum raised against the E. coli UmuD and UmuD' proteins to show that S. typhimurium expresses cross-reacting material only after treatment with the DNA-damaging agent mitomycin C. The S. typhimurium umuDC operon, therefore, appears to be regulated by mechanisms similar to the E. coli umuDC operon. After induction, the S. typhimurium UmuD protein was processed to UmuD' in both S. typhimurium and E. coli. However, the S. typhimurium UmuD protein appears to be cleaved more efficiently than the E. coli UmuD protein under similar conditions. The data suggest that conversion of UmuD to the mutagenically active UmuD' is not the rate-limiting factor accounting for the weakly mutable phenotype of S. typhimurium. C1 US FDA,MOLEC BIOL BRANCH,WASHINGTON,DC 20204. OFF NAVAL RES,DIV BIOL SCI,ARLINGTON,VA 22217. RP WOODGATE, R (reprint author), NICHHD,VIRUSES & CELLULAR BIOL SECT,BLDG 6,ROOM 1A13,9000 ROCKVILLE PIKE,BETHESDA,MD 20892, USA. NR 34 TC 19 Z9 20 U1 0 U2 0 PU SPRINGER VERLAG PI NEW YORK PA 175 FIFTH AVE, NEW YORK, NY 10010 SN 0026-8925 J9 MOL GEN GENET JI Mol. Gen. Genet. PD SEP PY 1991 VL 229 IS 1 BP 81 EP 85 PG 5 WC Biochemistry & Molecular Biology; Genetics & Heredity SC Biochemistry & Molecular Biology; Genetics & Heredity GA GF176 UT WOS:A1991GF17600011 PM 1910151 ER PT J AU CLARE, TA AF CLARE, TA TI DISCOVERY TO REALITY SO NAVAL ENGINEERS JOURNAL LA English DT Article AB This paper was adapted from an address delivered at the ASNE Flagship Section 1990 R&D Symposium, 24 October 1990. It challenges the conventional views on the transition of technology to the fleet and calls for greater cooperation among Navy and industrial participants in the technology development process. Characteristics of successful technology development programs are cited. The author suggests that a new perspective on the management of technology will be needed in the future. RP CLARE, TA (reprint author), USN,CTR SURFACE WARFARE,SILVER SPRING,MD 20910, 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 SEP PY 1991 VL 103 IS 5 BP 24 EP 26 PG 3 WC Engineering, Marine; Engineering, Civil; Oceanography SC Engineering; Oceanography GA GU506 UT WOS:A1991GU50600001 ER PT J AU RICE, ML AF RICE, ML TI THE NAVY NEW STANDARD DIGITAL SIGNAL PROCESSOR - THE AN/UYS-2 SO NAVAL ENGINEERS JOURNAL LA English DT Article AB An architectural summary of the AN/UYS-2 multi-processor digital signal processor is presented along with a brief description of the major technologies that are being incorporated into it. Discussion concentrates on the AN/UYS-2's implementation of data-flow parallel processing to achieve exceptionally high computing throughput rates. In addition, its functional components and the implementation of its hardware functional elements into standard electronic modules are discussed. Supporting this multi-processor architecture is a signal processing graph language methodology called Processing Graph Methodology (PGM) which is used to efficiently and cost-effectively program the AN/UYS-2. Finally, follow-on candidate technologies for infusion into the AN/UYS-2 are highlighted. RP RICE, ML (reprint author), USN,SEA SYST COMMANDS TACT PROCESSORS,PMS-412,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 SEP PY 1991 VL 103 IS 5 BP 27 EP 38 PG 12 WC Engineering, Marine; Engineering, Civil; Oceanography SC Engineering; Oceanography GA GU506 UT WOS:A1991GU50600002 ER PT J AU WILKES, MS FORTIN, AH JACOBS, TA AF WILKES, MS FORTIN, AH JACOBS, TA TI PHYSICIANS ATTITUDES TOWARD THE AUTOPSY OF PATIENTS WITH AIDS SO NEW YORK STATE JOURNAL OF MEDICINE LA English DT Article ID ACQUIRED-IMMUNODEFICIENCY-SYNDROME; STUDENTS ATTITUDES; DIAGNOSES AB In spite of the value of autopsy in modern medicine, autopsy rates continue to decline. This decline has been especially pronounced for patients who die of acquired immunodeficiency syndrome (AIDS). In this paper, we assess the attitudes of house officers toward the autopsy in AIDS patients. The survey encompassed 112 internal medicine housestaff (IMHS) and 37 pathology housestaff (PHS) at two New York City university hospitals that care for large numbers of AIDS patients. A self-administered questionnaire rated attitudes and practices concerning the autopsy in AIDS patients. Of IMHS, 83%, and of PHS, 89% answered the questionnaire. The vast majority of IMHS felt that the autopsy rate in persons dying of AIDS was too low; only 39% of PHS shared their view. Of the PHS, 36% felt the rate was too high and should be decreased. These PHS felt the autopsy rarely resulted in useful information and unnecessarily exposed the pathologist to human immunodeficiency virus (HIV) infection. The IMHS wanted more formal training in methods of discussing these issues with the patient and family. We conclude that there is a need for postgraduate teaching programs to educate on issues concerning the autopsy. Specifically, the IMHS need instruction on communicating with the family about the autopsy, and the PHS need instruction on the risks of acquiring AIDS from occupational exposure. C1 USN HOSP,DEPT INTERNAL MED,SAN DIEGO,CA. CARTER CTR,ATLANTA,GA. RP WILKES, MS (reprint author), UNIV CALIF LOS ANGELES,CTR HLTH SCI,SCH MED,DEPT MED,DIV GEN INTERNAL MED & HLTH SERV RES,LOS ANGELES,CA 90024, USA. NR 19 TC 3 Z9 3 U1 0 U2 0 PU MED SOC STATE OF NY PI LAKE SUCCESS PA 420 LAKEVILLE RD P O BOX 5404, LAKE SUCCESS, NY 11042 SN 0028-7628 J9 NEW YORK STATE J MED PD SEP PY 1991 VL 91 IS 9 BP 386 EP 389 PG 4 WC Medicine, General & Internal SC General & Internal Medicine GA GE859 UT WOS:A1991GE85900003 PM 1945149 ER PT J AU MAGANN, EF NOLAN, TE AF MAGANN, EF NOLAN, TE TI PREGNANCY OUTCOME IN AN ACTIVE-DUTY POPULATION SO OBSTETRICS AND GYNECOLOGY LA English DT Article ID BIRTH-WEIGHT; PRETERM; RISK; WORK AB The number of women in the military has grown since the initiation of the all-volunteer force. Pregnancy is no longer a justification for discharge from active service. Previously published reports have shown that active military service is associated with poor pregnancy outcomes. We compared a group of active-duty pregnant women (N = 331) matched for age and gravidity with a control group of dependent wives of active-duty personnel (N = 1218). Study variables examined were the incidences of cesarean and operative vaginal delivery, Apgar scores of less than 7 at 5 minutes, preterm complications (preterm labor and premature rupture of membranes) requiring transfer to a tertiary care center, pregnancy-induced hypertensive syndromes, intrauterine growth retardation (IUGR) (infant weight less than 2500 g), and pregnancy-related complications. In the active-duty group, the rates of primary cesarean (P < .001), transfer for preterm complications (P < .0001), pregnancy-induced hypertensive syndromes (P < .01), and IUGR (P < .05) were greater than in the control group. Active-duty service-women, despite defined limitations of work and ready access to health care, continue to represent a high-risk population. C1 MED COLL GEORGIA,DEPT OBSTET & GYNECOL,CJ-120,AUGUSTA,GA 30912. USN,NAVAL HOSP,CAMP LEJEUNE,NC 28542. NR 9 TC 29 Z9 29 U1 1 U2 2 PU ELSEVIER SCIENCE INC PI NEW YORK PA 655 AVENUE OF THE AMERICAS, NEW YORK, NY 10010 SN 0029-7844 J9 OBSTET GYNECOL JI Obstet. Gynecol. PD SEP PY 1991 VL 78 IS 3 BP 391 EP 393 PN 1 PG 3 WC Obstetrics & Gynecology SC Obstetrics & Gynecology GA GC368 UT WOS:A1991GC36800015 PM 1876371 ER PT J AU CARBONE, D CHIBA, I MITSUDOMI, T AF CARBONE, D CHIBA, I MITSUDOMI, T TI POLYMORPHISM AT CODON-213 WITHIN THE P53-GENE SO ONCOGENE LA English DT Note ID P53 GENE; LUNG-CANCER; MUTATIONS; FREQUENT; PROTEIN; MUTANT AB This report describes a rare polymorphism at codon 213 (silent alteration of CGA to CGG) within the coding region of the p53 gene. The rare polymorphic allele was present in six cases out of 189 lung and breast cancer DNAs analyzed (3.2%) and resulted in the loss of a TaqI site. This allele could be mistaken for a mutation when screening methods of mutation analysis are used without comparison with normal tissue DNA. C1 USN,MED ONCOL BRANCH,BETHESDA,MD 20889. RP CARBONE, D (reprint author), UNIV TEXAS,SW MED CTR,SIMMONS CANC CTR,2523 HARRY HINES BLVD,DALLAS,TX 75235, USA. OI Mitsudomi, Tetsuya/0000-0001-9860-8505 NR 14 TC 155 Z9 155 U1 0 U2 0 PU STOCKTON PRESS PI BASINGSTOKE PA HOUNDMILLS, BASINGSTOKE, HAMPSHIRE, ENGLAND RG21 6XS SN 0950-9232 J9 ONCOGENE JI Oncogene PD SEP PY 1991 VL 6 IS 9 BP 1691 EP 1692 PG 2 WC Biochemistry & Molecular Biology; Oncology; Cell Biology; Genetics & Heredity SC Biochemistry & Molecular Biology; Oncology; Cell Biology; Genetics & Heredity GA GX274 UT WOS:A1991GX27400027 PM 1923533 ER PT J AU SWARZTRAUBER, PN SWEET, RA BRIGGS, WL HENSON, VE OTTO, J AF SWARZTRAUBER, PN SWEET, RA BRIGGS, WL HENSON, VE OTTO, J TI BLUESTEIN FFT FOR ARBITRARY N ON THE HYPERCUBE SO PARALLEL COMPUTING LA English DT Article DE BLUESTEIN FFT; HYPERCUBE ARCHITECTURE; COMMUNICATION COMPLEXITY; COMPUTATIONAL COMPLEXITY ID FOURIER-TRANSFORM; VECTOR; ALGORITHM AB The original Cooley-Tukey FFT was published in 1965 and presented for sequences with length N equal to a power of two. However, in the same paper they noted that their algorithm could be generalized to composite N in which the length of the sequence was a product of small primes. In 1967, Bergland presented an algorithm for composite N and variants of his mixed radix FFT are currently in wide use. In 1968, Bluestein presented an FFT for arbitrary N including large primes. However, for composite N, Bluestein's FFT was not competitive with Bergland's FFT. Since it is usually possible to select a composite N, Bluestein's FFT did not receive much attention. Nevertheless because of its minimal communication requirements, the Bluestein FFT may be the algorithm of choice on multiprocessors, particularly those with the hypercube architecture. In contrast to the mixed radix FFT, the communication pattern of the Bluestein FFT maps quite well onto the hypercube. With P = 2d processors, an ordered Bluestein FFT requires 2d communication cycles with packet length N/2P which is comparable to the requirements of a power of two FFT. For fine-grain computations, the Bluestein FFT requires 20log2N computational cycles. Although this is double that required for a mixed radix FFT, the Bluestein FFT may nevertheless be preferred because of its lower communication costs. For most values of N it is also shown to be superior to another alternative, namely parallel multiplication. C1 UNIV COLORADO, DEPT MATH, COMPUTAT MATH GRP, DENVER, CO 80204 USA. USN, POSTGRAD SCH, DEPT MATH, MONTEREY, CA 93933 USA. RP SWARZTRAUBER, PN (reprint author), NATL CTR ATMOSPHER RES, BOULDER, CO 80307 USA. NR 16 TC 10 Z9 10 U1 1 U2 4 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0167-8191 EI 1872-7336 J9 PARALLEL COMPUT JI Parallel Comput. PD SEP PY 1991 VL 17 IS 6-7 BP 607 EP 617 DI 10.1016/S0167-8191(05)80051-1 PG 11 WC Computer Science, Theory & Methods SC Computer Science GA GM059 UT WOS:A1991GM05900001 ER PT J AU UHLMANN, JK AF UHLMANN, JK TI ADAPTIVE PARTITIONING STRATEGIES FOR TERNARY TREE-STRUCTURES SO PATTERN RECOGNITION LETTERS LA English DT Article DE MEASUREMENT CORRELATION; DATA FUSION; COMPUTATIONAL GEOMETRY; MULTIDIMENSIONAL TREES; ADAPTIVE DECOMPOSITION AB Test results of three adaptive partition strategies for constructing multidimensional ternary trees are presented. Such trees can be used to efficiently identify correlated measurements with error bounds that can be represented as finite volumes. RP UHLMANN, JK (reprint author), USN,RES LAB,DIV INFORMAT TECHNOL,CODE 5570,WASHINGTON,DC 20375, USA. NR 12 TC 6 Z9 6 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0167-8655 J9 PATTERN RECOGN LETT JI Pattern Recognit. Lett. PD SEP PY 1991 VL 12 IS 9 BP 537 EP 541 DI 10.1016/0167-8655(91)90124-5 PG 5 WC Computer Science, Artificial Intelligence SC Computer Science GA GJ182 UT WOS:A1991GJ18200005 ER PT J AU BERNHARDT, PA AF BERNHARDT, PA TI THE AUTONOMOUS CHAOTIC RELAXATION-OSCILLATOR - AN ELECTRICAL ANALOG TO THE DRIPPING FAUCET SO PHYSICA D LA English DT Article AB Both experimental and theoretical techniques have been employed to study the dynamics of an electrical relaxation oscillator that stimulates internal resonances. This autonomous chaotic relaxation oscillator (ACRO) circuit reproduces the type of aperiodic behavior that may be found in many physical systems such as dripping faucets, magnetospheric substorms, bowed musical instruments, or frictional brakes. The ACRO circuit displays a wide range of intermittency as the average pulse period and the internal damping rates are varied. Small changes in circuit parameters can produce sudden, hysteretic transitions from stable to quasiperiodic or aperiodic outputs. Using pulse period spectra, first return maps, Poincare sections, projections of trajectories, Lyapunov exponents, and power spectra, the full range of ACRO behavior is characterized. RP BERNHARDT, PA (reprint author), USN,RES LAB,DIV PLASMA PHYS,SPACE PLASMA BRANCH,WASHINGTON,DC 20375, USA. NR 27 TC 21 Z9 22 U1 1 U2 3 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0167-2789 J9 PHYSICA D JI Physica D PD SEP PY 1991 VL 52 IS 2-3 BP 489 EP 527 DI 10.1016/0167-2789(91)90141-U PG 39 WC Mathematics, Applied; Physics, Multidisciplinary; Physics, Mathematical SC Mathematics; Physics GA GK161 UT WOS:A1991GK16100025 ER PT J AU EMERY, MH GARDNER, JH LEHMBERG, RH OBENSCHAIN, SP AF EMERY, MH GARDNER, JH LEHMBERG, RH OBENSCHAIN, SP TI HYDRODYNAMIC TARGET RESPONSE TO AN INDUCED SPATIAL INCOHERENCE-SMOOTHED LASER-BEAM SO PHYSICS OF FLUIDS B-PLASMA PHYSICS LA English DT Article ID FUSION-TARGETS; INSTABILITIES AB One of the critical elements for high-gain target designs is the high degree of symmetry that must be maintained in the implosion process. The induced spatial incoherence (ISI) concept has some promise for reducing ablation pressure nonuniformities to almost-equal-to 1%. The ISI method produces a spatial irradiance profile that undergoes large random fluctuations on picosecond time scales but is smooth on long time scales. The ability of the ISI method to produce a nearly uniform ablation pressure is contingent on both temporal smoothing and thermal diffusion. In the start-up phase of a shaped reactor like laser pulse, the target is directly illuminated by the laser light and thermal diffusion is not effective at smoothing residual nonuniformities in the laser beam. During this period in the laser pulse, the target response is dominated by the initial shock generated by the laser pulse and the results indicate that this first shock can be the determining factor in the success or failure of the implosion process. The results of numerical simulations of several target/laser pulse designs which were investigated in an attempt to mitigate the impact of the initial shock structure stemming from the early temporal phase of an ISI-smoothed laser beam are presented. It is shown that "foamlike" layers, multiple laser wavelengths, and shallow angles of incidence can sharply reduce the perturbation level stemming from the first shock. C1 USN,RES LAB,LASER PLASMA BRANCH,WASHINGTON,DC 20375. RP EMERY, MH (reprint author), USN,RES LAB,COMPUTAT PHYS & FLUID DYNAM LAB,WASHINGTON,DC 20375, USA. NR 21 TC 84 Z9 84 U1 0 U2 2 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0899-8221 J9 PHYS FLUIDS B-PLASMA PD SEP PY 1991 VL 3 IS 9 BP 2640 EP 2651 DI 10.1063/1.859976 PG 12 WC Physics, Fluids & Plasmas SC Physics GA GD009 UT WOS:A1991GD00900023 ER PT J AU FERNSLER, RF SLINKER, SP HUBBARD, RF AF FERNSLER, RF SLINKER, SP HUBBARD, RF TI THEORY OF ELECTRON-BEAM TRACKING IN REDUCED-DENSITY CHANNELS SO PHYSICS OF FLUIDS B-PLASMA PHYSICS LA English DT Article ID PLASMA; CODE; HOSE AB A theory is presented for the guiding of relativistic electron beams by rarefied gaseous channels. The analysis is based on analytic computations of the transverse force felt by a rigid-rod beam propagating off axis from a channel of reduced gas density. The density gradients produce an attractive channel force that can be surprisingly robust, even though it develops from relatively subtle gas chemistry properties. Static numerical calculations support the analytic work. Longitudinal beam coupling and effects that degrade channel guidance are discussed as well. RP FERNSLER, RF (reprint author), USN,RES LAB,DIV PLASMA PHYS,BEAM PHYS BRANCH,WASHINGTON,DC 20375, USA. NR 27 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 0899-8221 J9 PHYS FLUIDS B-PLASMA PD SEP PY 1991 VL 3 IS 9 BP 2696 EP 2706 DI 10.1063/1.859981 PG 11 WC Physics, Fluids & Plasmas SC Physics GA GD009 UT WOS:A1991GD00900028 ER PT J AU AYLESWORTH, K AF AYLESWORTH, K TI WHY IS A PHYSICS PHD LIKE A JUGGLER - REPLY SO PHYSICS TODAY LA English DT Letter RP AYLESWORTH, K (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 2 TC 0 Z9 0 U1 0 U2 0 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0031-9228 J9 PHYS TODAY JI Phys. Today PD SEP PY 1991 VL 44 IS 9 BP 11 EP & PG 0 WC Physics, Multidisciplinary SC Physics GA GG167 UT WOS:A1991GG16700003 ER PT J AU WIRTZ, JJ AF WIRTZ, JJ TI THE SHATTERED CRYSTAL BALL - FEAR AND LEARNING IN THE CUBAN MISSILE CRISIS - BLIGHT,JG SO POLITICAL SCIENCE QUARTERLY LA English DT Book Review RP WIRTZ, JJ (reprint author), USN,POSTGRAD SCH,WASHINGTON,DC 20350, USA. NR 1 TC 0 Z9 0 U1 0 U2 1 PU ACAD POLITICAL SCIENCE PI NEW YORK PA 475 RIVERSIDE DRIVE, SUITE 1274, NEW YORK, NY 10115-1274 SN 0032-3195 J9 POLIT SCI QUART JI Polit. Sci. Q. PD FAL PY 1991 VL 106 IS 3 BP 545 EP 546 DI 10.2307/2151767 PG 2 WC Political Science SC Government & Law GA GH850 UT WOS:A1991GH85000031 ER PT J AU NIEH, S LEE, SW FU, TT AF NIEH, S LEE, SW FU, TT TI EFFECTS OF TUBE ORIENTATION AND GAS VELOCITY ON THE EROSION OF A TUBE INSERTED INTO A FLUIDIZED-BED SO POWDER TECHNOLOGY LA English DT Article AB Erosion of in-bed tubes, water wall and downstream heat transfer surfaces by bed materials and elutriated particles has persistently plagued most fluidized bed combustion (FBC) systems. This paper presents a systematic experimental study of the effects of tube arrangement and flow condition on embedded tube erosion by using erosion-prone wax cylinders in a 21 cm x 21 cm bench-scale cold fluidized bed. The erosion tests were conducted with 550-mu-m microbeads glass shot at various combinations of superficial fluidizing velocity, tube orientation and location, tube-to-distributor clearance, and tube circumferential angle. It was found that tube erosion occurs at a threshold fluidizing velocity (26 cm s-1) close to the minimum fluidizing velocity (19 cm s-1), and increases almost linearly with increasing superficial velocity. The specific erosion rate of embedded wax cylinders is high and in the order of 1 mg cm-2 h-1. Under the same condition, the weight loss of in-bed horizontal tubes (0-degrees) is the maximum, followed by 30-degrees inclined tubes, 60-degrees inclined tubes, and vertical tubes (90-degrees). The erosion around a horizontal tube showed that the very bottom part of the tube experienced the heaviest erosion, which amounted to 5 times that of the tube top. C1 USN,CIVIL ENGN LAB,PORT HUENEME,CA 93043. RP NIEH, S (reprint author), CATHOLIC UNIV AMER,DEPT MECH ENGN,WASHINGTON,DC 20064, USA. NR 14 TC 5 Z9 5 U1 1 U2 2 PU ELSEVIER SCIENCE SA LAUSANNE PI LAUSANNE 1 PA PO BOX 564, 1001 LAUSANNE 1, SWITZERLAND SN 0032-5910 J9 POWDER TECHNOL JI Powder Technol. PD SEP PY 1991 VL 67 IS 3 BP 229 EP 235 DI 10.1016/0032-5910(91)80105-R PG 7 WC Engineering, Chemical SC Engineering GA GG404 UT WOS:A1991GG40400002 ER PT J AU FRIEDMAN, H AF FRIEDMAN, H TI THE INVISIBLE UNIVERSE + AN ESSAY ON ASTRONOMY SO PROCEEDINGS OF THE AMERICAN PHILOSOPHICAL SOCIETY LA English DT Article RP FRIEDMAN, H (reprint author), USN,RES LAB,EO HULBURT CTR SPACE RES,WASHINGTON,DC 20375, USA. NR 0 TC 1 Z9 1 U1 0 U2 0 PU AMER PHILOSOPHICAL SOC PI PHILADELPHIA PA 104 SOUTH FIFTH ST, PHILADELPHIA, PA 19106-3387 SN 0003-049X J9 P AM PHILOS SOC JI Proc. Amer. Philos. Soc. PD SEP PY 1991 VL 135 IS 3 BP 339 EP 345 PG 7 WC Humanities, Multidisciplinary SC Arts & Humanities - Other Topics GA GL809 UT WOS:A1991GL80900003 ER PT J AU MAXWELL, SE COLE, DA ARVEY, RD SALAS, E AF MAXWELL, SE COLE, DA ARVEY, RD SALAS, E TI A COMPARISON OF METHODS FOR INCREASING POWER IN RANDOMIZED BETWEEN-SUBJECTS DESIGNS SO PSYCHOLOGICAL BULLETIN LA English DT Article ID STATISTICAL POWER; DIFFERENCE SCORES; RELIABILITY; PARADOX; TESTS; CONTRADICTIONS; STABILITY; BEHAVIOR AB Power in a randomized between-subjects design can be enhanced by increasing sample size or increasing alpha level. This article compares 2 other methods of increasing power by reducing within-group error: (a) by adding a pretest to the design and using analysis of covariance (ANCOVA) and (b) by increasing the length of the posttest and using analysis of variance (ANOVA). Results showed that the relative power of these approaches depends on the degree to which the posttest is lengthened, on the reliability of the posttest, and on the pretest-posttest correlation. When reliability or the pretest-posttest correlation is low doubling the length of the posttest makes ANOVA more powerful than ANCOVA conducted on the original measures. C1 UNIV MINNESOTA,CTR IND RELAT,MINNEAPOLIS,MN 55455. USN,CTR TRAINING SYST,ORLANDO,FL. RP MAXWELL, SE (reprint author), UNIV NOTRE DAME,DEPT PSYCHOL,NOTRE DAME,IN 46556, USA. RI Rohlf, F/A-8710-2008 NR 32 TC 21 Z9 21 U1 1 U2 3 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 SEP PY 1991 VL 110 IS 2 BP 328 EP 337 DI 10.1037//0033-2909.110.2.328 PG 10 WC Psychology; Psychology, Multidisciplinary SC Psychology GA GE036 UT WOS:A1991GE03600012 ER PT J AU KIM, CS YEH, C AF KIM, CS YEH, C TI SCATTERING OF AN OBLIQUELY INCIDENT WAVE BY A MULTILAYERED ELLIPTIC LOSSY DIELECTRIC CYLINDER SO RADIO SCIENCE LA English DT Article AB The scattering problem of obliquely incident waves on a multilayered elliptical cylinder is considered. The cylinder is assumed homogeneous and isotropic but lossy. Both polarization of the incident wave, the E wave, and the H wave are considered. In the theoretical analysis the number of layers are unlimited, but in the numerical analysis we limit the number of layers so we can avoid excessively long computer running time. The numerical results include the bistatic radar cross sections, the specular differential cross sections, and the efficiency factors for absorption, scattering, and extinction. The computed results show the dependence of the scattering on the size, shape, material, and the angle of the incident. C1 UNIV CALIF LOS ANGELES,DEPT ELECT ENGN,LOS ANGELES,CA 90024. RP KIM, CS (reprint author), USN,CTR UNDERWATER SYST,DEPT SUBMARINE ELECTROMAGNET SYST,NEW LONDON,CT 06320, USA. NR 29 TC 10 Z9 10 U1 0 U2 2 PU AMER GEOPHYSICAL UNION PI WASHINGTON PA 2000 FLORIDA AVE NW, WASHINGTON, DC 20009 SN 0048-6604 J9 RADIO SCI JI Radio Sci. PD SEP-OCT PY 1991 VL 26 IS 5 BP 1165 EP 1176 DI 10.1029/91RS01706 PG 12 WC Astronomy & Astrophysics; Geochemistry & Geophysics; Meteorology & Atmospheric Sciences; Remote Sensing; Telecommunications SC Astronomy & Astrophysics; Geochemistry & Geophysics; Meteorology & Atmospheric Sciences; Remote Sensing; Telecommunications GA GJ939 UT WOS:A1991GJ93900002 ER PT J AU HULLANDER, M SPILLANE, W LEIVERS, D BALSARA, Z AF HULLANDER, M SPILLANE, W LEIVERS, D BALSARA, Z TI THE USE OF DOPPLER ULTRASOUND TO ASSIST WITH SCIATIC-NERVE BLOCKS SO REGIONAL ANESTHESIA LA English DT Article DE REGIONAL ANESTHESIA, LEG BLOCKS, SCIATIC NERVE; DOPPLER ULTRASOUND AB Twenty consecutive patients requiring surgical procedures on a lower extremity received leg blocks using a modification of Labat's classic approach. A Doppler ultrasound pencil probe was used to identify the dominant arterial structure exiting the sciatic notch with the sciatic nerve. A block needle was inserted in the same orientation as the probe until paresthesias were elicited; then 25 ml of local anesthetic was injected. Successful block was achieved in one or two attempts in 70% of the patients. RP HULLANDER, M (reprint author), USN HOSP,DEPT CLIN INVEST,SAN DIEGO,CA 92134, USA. NR 0 TC 6 Z9 7 U1 0 U2 0 PU CHURCHILL LIVINGSTONE INC MEDICAL PUBLISHERS PI NEW YORK PA 650 AVENUE OF THE AMERICAS, NEW YORK, NY 10011 SN 0146-521X J9 REGION ANESTH JI Reg. Anesth. PD SEP-OCT PY 1991 VL 16 IS 5 BP 282 EP 284 PG 3 WC Anesthesiology SC Anesthesiology GA GK865 UT WOS:A1991GK86500009 PM 1958607 ER PT J AU PECKERAR, M SHAMMA, SA REBBERT, M KOSAKOWSKI, J ISAACSON, P AF PECKERAR, M SHAMMA, SA REBBERT, M KOSAKOWSKI, J ISAACSON, P TI PASSIVE MICROELECTRODE ARRAYS FOR RECORDING OF NEURAL SIGNALS - A SIMPLIFIED FABRICATION PROCESS SO REVIEW OF SCIENTIFIC INSTRUMENTS LA English DT Article ID NEUROELECTRIC DATA; ELECTRODES; NEURONS AB A new process for the fabrication of microelectrode arrays is developed that is fully compatible with standard integrated circuit fabrication schedules. The process involves two innovations: the use of initially thin silicon substrates (50-mu-m), and the use of sputtered SiO2 as a plasma etching mask. The finished electrode array consists of a very thin silicon substrate (< 20-mu-m) that provides a mechanically stable carrier for the electrodes. The electrode metal conductors are sandwiched between two layers of polyimide films that adhere firmly to the substrate. Small electrode interface and contact windows are made with lithographically limited minimum feature sizes. Dry plasma etching is employed both to open the windows and to thin the substrate. For the former, we have determined the appropriate etching conditions and thicknesses necessary for SiO2 to be a viable mask in this step. For the latter step, the electrode profile is first etched to the final desired substrate thickness from the front (with the same oxide as the mask), and the wafer is then turned over and fully etched until the electrodes separate. Using initially thin wafers simplifies considerably this final etch. C1 USN,RES LAB,WASHINGTON,DC 20375. UNIV MARYLAND,INST ADV COMP STUDIES,COLLEGE PK,MD 20742. RP PECKERAR, M (reprint author), UNIV MARYLAND,DEPT ELECT ENGN,SYST RES CTR,COLLEGE PK,MD 20742, USA. RI Shamma, Shihab/F-9852-2012 NR 17 TC 6 Z9 6 U1 1 U2 1 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0034-6748 J9 REV SCI INSTRUM JI Rev. Sci. Instrum. PD SEP PY 1991 VL 62 IS 9 BP 2276 EP 2280 DI 10.1063/1.1142349 PG 5 WC Instruments & Instrumentation; Physics, Applied SC Instruments & Instrumentation; Physics GA GD506 UT WOS:A1991GD50600036 ER PT J AU PAO, PS GILL, SJ BAYLES, RA YODER, GR AF PAO, PS GILL, SJ BAYLES, RA YODER, GR TI EFFECT OF RIPPLE LOADS ON STRESS-CORROSION CRACKING IN AL 7075 ALLOYS SO SCRIPTA METALLURGICA ET MATERIALIA LA English DT Article C1 OFF NAVAL RES,ARLINGTON,VA 22217. RP PAO, PS (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 12 TC 4 Z9 5 U1 0 U2 2 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0956-716X J9 SCRIPTA METALL MATER JI Scr. Metall. Materialia PD SEP PY 1991 VL 25 IS 9 BP 2085 EP 2089 DI 10.1016/0956-716X(91)90279-A PG 5 WC Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Materials Science; Metallurgy & Metallurgical Engineering GA GE197 UT WOS:A1991GE19700018 ER PT J AU NISENOFF, M GUBSER, DU WOLF, SA RITTER, JC PRICE, G AF NISENOFF, M GUBSER, DU WOLF, SA RITTER, JC PRICE, G TI HIGH-TEMPERATURE SUPERCONDUCTIVITY SPACE EXPERIMENT (HTSSE) SO SUPERCONDUCTOR SCIENCE & TECHNOLOGY LA English DT Article AB The Naval Research Laboratory (NRL) is exploring the feasibility of deploying high temperature superconducting electrical and electronic devices and components in space. A variety of devices, primarily passive microwave components, have been procured and will be integrated with a cryogenic refrigerator system and data acquisition system to form the space package. This space experiment will demonstrate that HTS technology is sufficiently robust to survive the space environment and that it has the potential to significantly improve space communications systems. The devices for the initial launch have been received by NRL, their electrical characteristics verified and their packages space qualified. The devices are currently being integrated into the final space package which will be shipped from NRL late in 1991 for integration into the spacecraft payload. Once placed in Earth orbit, the experimental package will be cooled to cryogenic temperatures and the characteristics of the HTS devices monitored periodically for the planned 12 months duration of the space experiment which is scheduled to start in 1993. RP NISENOFF, M (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. RI Wolf, Stuart/A-7513-2009 NR 3 TC 2 Z9 2 U1 0 U2 0 PU IOP PUBLISHING LTD PI BRISTOL PA TECHNO HOUSE, REDCLIFFE WAY, BRISTOL, ENGLAND BS1 6NX SN 0953-2048 J9 SUPERCOND SCI TECH JI Supercond. Sci. Technol. PD SEP PY 1991 VL 4 IS 9 BP 449 EP 452 DI 10.1088/0953-2048/4/9/019 PG 4 WC Physics, Applied; Physics, Condensed Matter SC Physics GA GV522 UT WOS:A1991GV52200018 ER PT J AU NOTARO, JR MASSER, PA AF NOTARO, JR MASSER, PA TI ANNULAR COLON LIPOMA - A CASE-REPORT AND REVIEW OF THE LITERATURE SO SURGERY LA English DT Review AB Colonic lipomas are generally mildly symptomatic or asymptomatic pedunculated or sessile polyps, although they have been reported to cause intussusception or significant bleeding. The difficulty in differentiation is primarily with adenomatous polyps. We describe the unique case of a symptomatic annular colon lipoma simulating an annular colon carcinoma. RP NOTARO, JR (reprint author), USN HOSP,DEPT SURG,PORTSMOUTH,VA 23708, USA. NR 19 TC 18 Z9 20 U1 0 U2 1 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 SEP PY 1991 VL 110 IS 3 BP 570 EP 572 PG 3 WC Surgery SC Surgery GA GE315 UT WOS:A1991GE31500020 PM 1887386 ER PT J AU FITZGERALD, J TAYLOR, W OWEN, H AF FITZGERALD, J TAYLOR, W OWEN, H TI FACILE SYNTHESIS OF SUBSTITUTED FUMARONITRILES AND MALEONITRILES - PRECURSORS TO SOLUBLE TETRAAZAPORPHYRINS SO SYNTHESIS-STUTTGART LA English DT Article AB Alkynes are converted in good yield to alkyl and/or aryl substituted fumaronitriles and maleonitriles, a rich source of precursors to soluble tetraazaporphyrins. RP FITZGERALD, J (reprint author), USN ACAD,DEPT CHEM,ANNAPOLIS,MD 21402, USA. NR 15 TC 61 Z9 61 U1 0 U2 7 PU GEORG THIEME VERLAG PI STUTTGART PA P O BOX 30 11 20, D-70451 STUTTGART, GERMANY SN 0039-7881 J9 SYNTHESIS-STUTTGART JI Synthesis PD SEP PY 1991 IS 9 BP 686 EP 688 PG 3 WC Chemistry, Organic SC Chemistry GA GG410 UT WOS:A1991GG41000004 ER PT J AU MANSOUR, NS FRYAUFF, DJ MODI, GB MIKHAIL, EM YOUSSEF, FG AF MANSOUR, NS FRYAUFF, DJ MODI, GB MIKHAIL, EM YOUSSEF, FG TI ISOLATION AND CHARACTERIZATION OF LEISHMANIA-MAJOR FROM PHLEBOTOMUS-PAPATASI AND MILITARY PERSONNEL IN NORTH SINAI, EGYPT SO TRANSACTIONS OF THE ROYAL SOCIETY OF TROPICAL MEDICINE AND HYGIENE LA English DT Note RP MANSOUR, NS (reprint author), USN,RES PUBLICAT BRANCH,MED RES UNIT NO 3,FPO,NEW YORK,NY 09835, USA. NR 11 TC 14 Z9 16 U1 0 U2 0 PU ROYAL SOC TROPICAL MEDICINE PI LONDON PA MANSON HOUSE 26 PORTLAND PLACE, LONDON, ENGLAND W1N 4EY SN 0035-9203 J9 T ROY SOC TROP MED H JI Trans. Roy. Soc. Trop. Med. Hyg. PD SEP-OCT PY 1991 VL 85 IS 5 BP 590 EP 591 DI 10.1016/0035-9203(91)90353-Z PG 2 WC Public, Environmental & Occupational Health; Tropical Medicine SC Public, Environmental & Occupational Health; Tropical Medicine GA GM446 UT WOS:A1991GM44600007 PM 1780981 ER PT J AU SABRY, M GAMAL, H ELMASRY, N KILPATRICK, ME AF SABRY, M GAMAL, H ELMASRY, N KILPATRICK, ME TI A PLACEBO-CONTROLLED DOUBLE-BLIND TRIAL FOR THE TREATMENT OF BANCROFTIAN FILARIASIS WITH IVERMECTIN OR DIETHYLCARBAMAZINE SO TRANSACTIONS OF THE ROYAL SOCIETY OF TROPICAL MEDICINE AND HYGIENE LA English DT Article AB Therapeutic efficacy and clinical side-effects of ivermectin (single dose of 100-mu-g/kg) and diethylcarbamazine (DEC) (3 mg/kg for one day, then 6 mg/kg daily for 12 d) were evaluated for microfilaricidal effect in Bancroftian filariasis. Seventy-one microfilaraemic consenting adult male patients (greater-than-or-equal-to 100 microfilariae (mf)/ml) were randomly assigned to receive ivermectin, DEC or placebo and kept in hospital for 15 d. Those receiving placebo were treated with ivermectin on day 9. Ivermectin (19 'double-blinded' and 22 'unblinded' patients) caused an abrupt reduction in mf count to 1.5% of the pre-treatment level 12 h after drug administration and to 0.06% on day 14, with recrudescence to 1.8% after one month and to 9.2% after 3 months. DEC (30 patients) caused a gradual drop in mf count to 1.1% of the pre-treatment level on day 14, which increased to 2.4% after one and 3 months. The total scores of side-effects were 77 (1%), 305 (2.1%) and 311.5 (3.0%) for placebo, ivermectin and DEC respectively; the differences between DEC or ivermectin and placebo were statistically significant. Ivermectin produced lower side-reaction scores than DEC and the differences were highly significant at the 95% confidence level. Side-effects were mainly headache and body aches in the ivermectin patients, which appeared as early as 4 h after drug administration, resolved within 36 to 48 hours, and were significantly related to mf densities. Side-effects in DEC patients were mainly testicular and epididymal pain and swelling, unrelated to mf densities, which began at day 2 and continued to day 7. Single dose ivermectin was more effective in reducing microfilaraemia in Bancroftian filariasis than a 13 d course of DEC for a period of about 2 months after treatment, and side effects were of shorter duration. C1 MINIST HLTH CAIRO,ABBASSIA FEVER HOSP,CAIRO,EGYPT. RP SABRY, M (reprint author), USN,MED RES UNIT 3,FPO,NEW YORK,NY 09527, USA. NR 10 TC 11 Z9 11 U1 0 U2 0 PU ROYAL SOC TROPICAL MEDICINE PI LONDON PA MANSON HOUSE 26 PORTLAND PLACE, LONDON, ENGLAND W1N 4EY SN 0035-9203 J9 T ROY SOC TROP MED H JI Trans. Roy. Soc. Trop. Med. Hyg. PD SEP-OCT PY 1991 VL 85 IS 5 BP 640 EP 643 DI 10.1016/0035-9203(91)90375-9 PG 4 WC Public, Environmental & Occupational Health; Tropical Medicine SC Public, Environmental & Occupational Health; Tropical Medicine GA GM446 UT WOS:A1991GM44600024 PM 1780996 ER PT J AU LEE, TF BOYLE, JS AF LEE, TF BOYLE, JS TI A SYNOPTIC COMPARISON OF SSM/I WINDS WITH OUTPUT FROM AN OPERATIONAL FORECAST SYSTEM SO WEATHER AND FORECASTING LA English DT Article AB Near-surface wind speed analyses from the Special Sensor Microwave/Imager (SSM/I) are compared with those from an operational numerical forecast system. Substantial agreement exists, especially over open ocean. Nevertheless, the use of both fields together should lead to a better understanding of the synoptic situation than the use of either field alone. The SSM/I winds give a superior representation of spatial variations of wind speed. Also, the SSM/I information can be used to examine continental influences on marine wind speeds. Such mesoscale effects are not analyzed well by global numerical models. On the other hand, the output from the numerical forecast system provides wind direction, a parameter not available from the SSM/I. In addition, forecast system winds fill in information between satellite passes and in regions contaminated by precipitation. RP LEE, TF (reprint author), USN,NAVAL OCEANOG & ATMOSPHER RES LAB,ATMOSPHER DIRECTORATE,MONTEREY,CA 93943, USA. NR 0 TC 4 Z9 4 U1 0 U2 0 PU AMER METEOROLOGICAL SOC PI BOSTON PA 45 BEACON ST, BOSTON, MA 02108-3693 SN 0882-8156 J9 WEATHER FORECAST JI Weather Forecast. PD SEP PY 1991 VL 6 IS 3 BP 404 EP 410 DI 10.1175/1520-0434(1991)006<0404:ASCOSW>2.0.CO;2 PG 7 WC Meteorology & Atmospheric Sciences SC Meteorology & Atmospheric Sciences GA GG192 UT WOS:A1991GG19200008 ER PT J AU COOPER, KP AYERS, JD KAMPE, JCM FENG, CR LOCCI, IE AF COOPER, KP AYERS, JD KAMPE, JCM FENG, CR LOCCI, IE TI MICROSTRUCTURAL EVOLUTION AND THERMAL-STABILITY IN RAPIDLY SOLIDIFIED HIGH-CHROMIUM-CONTAINING COPPER-ALLOYS SO MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING LA English DT Article ID PHASE AB Rapidly solidified samples of Cu-Cr alloys containing 2 wt.% Ag were prepared by high pressure gas atomization and by melt spinning. Both quenching techniques yielded microstructures which showed evidence of the formation of two immiscible liquids prior to solidification. To evaluate the effect of high temperatures on the stability of the as-solidified microstructures, samples prepared by hot isostatic pressing (HIP) consolidation of the atomized powder and by heat treatment of the melt-spun ribbons were examined in the scanning electron microscope and transmission electron microscope. Results showed that the shape of the chromium phase in all cases was spheroidal and the spheroid size depended upon the solidification rate and alloy composition. The chromium spheriods in the melt-spun ribbon readily coarsened at higer temperatures, but the coarser chromium spheroids in the atomized powders ripened less quickly when hot isostatically pressed at comparable temperatures. Although capillary-driven diffusional coarsening predominated, diffusion-controlled growth from supersaturation also played a part in increasing the spheroid size. Coarsening in the annealed melt-spun ribbons resulted in a loss of microhardness, while HIP consolidation had little effect on the microhardness of the atomized powder. C1 NASA,LEWIS RES CTR,CLEVELAND,OH 44135. RP COOPER, KP (reprint author), USN,RES LAB,DIV MAT SCI & TECHNOL,CODE 6320,WASHINGTON,DC 20375, USA. NR 22 TC 18 Z9 19 U1 1 U2 2 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 AUG 30 PY 1991 VL 142 IS 2 BP 221 EP 233 DI 10.1016/0921-5093(91)90661-6 PG 13 WC Nanoscience & Nanotechnology; Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Science & Technology - Other Topics; Materials Science; Metallurgy & Metallurgical Engineering GA GD452 UT WOS:A1991GD45200010 ER PT J AU SRINIVASAN, R MURPHY, JC FAINCHTEIN, R PATTABIRAMAN, N AF SRINIVASAN, R MURPHY, JC FAINCHTEIN, R PATTABIRAMAN, N TI ELECTROCHEMICAL STM OF CONDENSED GUANINE ON GRAPHITE SO JOURNAL OF ELECTROANALYTICAL CHEMISTRY LA English DT Note ID MERCURY WATER INTERFACE C1 USN,RES LAB,WASHINGTON,DC 20375. RP SRINIVASAN, R (reprint author), JOHNS HOPKINS UNIV,APPL PHYS LAB,LAUREL,MD 20723, USA. NR 15 TC 72 Z9 73 U1 0 U2 3 PU ELSEVIER SCIENCE SA LAUSANNE PI LAUSANNE 1 PA PO BOX 564, 1001 LAUSANNE 1, SWITZERLAND SN 0022-0728 J9 J ELECTROANAL CHEM JI J. Electroanal. Chem. PD AUG 26 PY 1991 VL 312 IS 1-2 BP 293 EP 300 DI 10.1016/0022-0728(91)85161-H PG 8 WC Chemistry, Analytical; Electrochemistry SC Chemistry; Electrochemistry GA GE149 UT WOS:A1991GE14900021 ER PT J AU KAXIRAS, E BROUGHTON, J HEMLEY, RJ AF KAXIRAS, E BROUGHTON, J HEMLEY, RJ TI ONSET OF METALLIZATION AND RELATED TRANSITIONS IN SOLID HYDROGEN SO PHYSICAL REVIEW LETTERS LA English DT Article ID INSULATOR-METAL TRANSITION; X-RAY-DIFFRACTION; MEGABAR PRESSURES; PHASE-TRANSITION; STATE AB The onset of metallization in highly compressed solid hydrogen and a corresponding discontinuity in molecular vibrations have been linked in the literature to band-gap closure in an ordered hcp structure. We performed extensive first-principles calculations on the energetics and the electronic properties of solid hydrogen, and explored in detail variations in molecular orientations, bond lengths, and the c/a ratio, within an hcp lattice. We find that the commonly assumed structure is energetically unfavorable, and that lower-energy structures have wider band gaps to much higher density. Implications for the onset of metallization are discussed. C1 USN, RES LAB, WASHINGTON, DC 20375 USA. CARNEGIE INST WASHINGTON, GEOPHYS LAB, WASHINGTON, DC 20015 USA. CARNEGIE INST WASHINGTON, CTR HIGH PRESSURE RES, WASHINGTON, DC 20015 USA. NR 30 TC 89 Z9 91 U1 1 U2 5 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 AUG 26 PY 1991 VL 67 IS 9 BP 1138 EP 1141 DI 10.1103/PhysRevLett.67.1138 PG 4 WC Physics, Multidisciplinary SC Physics GA GC603 UT WOS:A1991GC60300021 ER PT J AU HO, T WYNNE, KJ AF HO, T WYNNE, KJ TI FLUORINATED POLYURETHANES - POLYMERIZATION, CHARACTERIZATION AND MECHANICAL-PROPERTIES SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 GEORGE MASON UNIV,DEPT CHEM,FAIRFAX,VA 22030. OFF NAVAL RES,DIV CHEM,ARLINGTON,VA 22217. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 25 PY 1991 VL 202 BP 18 EP POLY PN 2 PG 0 WC Chemistry, Multidisciplinary SC Chemistry GA HG081 UT WOS:A1991HG08100920 ER PT J AU STEMPLE, JZ ROLISON, DR AF STEMPLE, JZ ROLISON, DR TI THE INFLUENCE OF ELECTRIC-FIELDS ON ORGANIC-REACTIONS AT ZEOLITE-SUPPORTED NANOMETER-SIZED ELECTRODES SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 USN,RES LAB,SURFACE CHEM BRANCH,WASHINGTON,DC 20375. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 25 PY 1991 VL 202 BP 18 EP CATL PN 1 PG 0 WC Chemistry, Multidisciplinary SC Chemistry GA HG080 UT WOS:A1991HG08001001 ER PT J AU BUTLER, LG CORY, DG DOOLEY, KM MILLER, JB GARROWAY, AN AF BUTLER, LG CORY, DG DOOLEY, KM MILLER, JB GARROWAY, AN TI NMR IMAGING OF ANISOTROPIC SOLID-STATE CHEMICAL-REACTIONS USING MULTIPLE-PULSE LINE NARROWING TECHNIQUES AND 1HT1 WEIGHTING SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 USN,RES LAB,DIV CHEM,WASHINGTON,DC 20375. LOUISIANA STATE UNIV,DEPT CHEM,BATON ROUGE,LA 70803. LOUISIANA STATE UNIV,DEPT CHEM ENGN,BATON ROUGE,LA 70803. RI Butler, Leslie/D-1636-2016 OI Butler, Leslie/0000-0003-1547-608X NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 25 PY 1991 VL 202 BP 22 EP CATL PN 1 PG 0 WC Chemistry, Multidisciplinary SC Chemistry GA HG080 UT WOS:A1991HG08001005 ER PT J AU HU, HSW GRIFFITH, JR AF HU, HSW GRIFFITH, JR TI A NOVEL ROUTE TO 2 HEAVILY FLUORINATED EPOXY-RESINS FROM A FLUORODIIMIDEDIOL SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 GEOCENTERS INC,FT WASHINGTON,MD 20744. USN,RES LAB,WASHINGTON,DC 20375. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 25 PY 1991 VL 202 BP 37 EP POLY PN 2 PG 0 WC Chemistry, Multidisciplinary SC Chemistry GA HG081 UT WOS:A1991HG08100939 ER PT J AU MARKS, CM FREITAS, JA VOLD, CL SNAIL, KA AF MARKS, CM FREITAS, JA VOLD, CL SNAIL, KA TI HOMOEPITAXIAL HIGH-TEMPERATURE DIAMOND GROWTH FROM ACETYLENE-OXYGEN FLAMES SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 USN,RES LAB,DIV OPT SCI,WASHINGTON,DC 20375. NR 0 TC 0 Z9 0 U1 0 U2 1 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 25 PY 1991 VL 202 BP 37 EP FUEL PN 1 PG 0 WC Chemistry, Multidisciplinary SC Chemistry GA HG080 UT WOS:A1991HG08001820 ER PT J AU ROLISON, DR STEMPLE, JZ AF ROLISON, DR STEMPLE, JZ TI ELECTROCHEMISTRY ON THE NANOMETER SCALE - DISPERSION ELECTROLYSIS WITH ZEOLITE-SUPPORTED NANOMETER-SIZED ELECTRODES SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 USN,RES LAB,SURFACE CHEM BRANCH,WASHINGTON,DC 20375. NR 0 TC 0 Z9 0 U1 0 U2 1 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 25 PY 1991 VL 202 BP 61 EP COLL PN 1 PG 0 WC Chemistry, Multidisciplinary SC Chemistry GA HG080 UT WOS:A1991HG08001460 ER PT J AU DEITZ, VR AF DEITZ, VR TI RATE OF WATER-VAPOR INTERACTION WITH CARBON ADSORBENTS AND SUCROSE CRYSTALS SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 USN,RES LAB,WASHINGTON,DC 20375. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 25 PY 1991 VL 202 BP 62 EP CARB PN 1 PG 0 WC Chemistry, Multidisciplinary SC Chemistry GA HG080 UT WOS:A1991HG08000978 ER PT J AU RETTIG, W NACIRI, J SHASHIDHAR, R DURAN, RS AF RETTIG, W NACIRI, J SHASHIDHAR, R DURAN, RS TI STUDY OF A FERROELECTRIC SIDE-CHAIN POLYMER AT DIFFERENT INTERFACES USING THE LANGMUIR-BLODGETT TECHNIQUE SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 KSV INSTRUMENTS,HELSINKI,FINLAND. UNIV FLORIDA,DEPT CHEM,GAINESVILLE,FL 32611. USN,RES LAB,CTR BIOMOLEC SCI & ENGN,WASHINGTON,DC 20375. NR 0 TC 0 Z9 0 U1 0 U2 1 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 25 PY 1991 VL 202 BP 71 EP COLL PN 1 PG 0 WC Chemistry, Multidisciplinary SC Chemistry GA HG080 UT WOS:A1991HG08001470 ER PT J AU GARLAND, NL AF GARLAND, NL TI KINETIC-STUDIES OF BORON AND ALUMINUM SPECIES SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 USN,RES LAB,DIV CHEM,WASHINGTON,DC 20375. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 25 PY 1991 VL 202 BP 86 EP PHYS PN 2 PG 0 WC Chemistry, Multidisciplinary SC Chemistry GA HG081 UT WOS:A1991HG08100622 ER PT J AU CHEEK, GT AF CHEEK, GT TI ELECTROCHEMISTRY OF AROMATIC KETONES IN A ROOM-TEMPERATURE MOLTEN-SALT SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 USN ACAD,DEPT CHEM,ANNAPOLIS,MD 21402. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 25 PY 1991 VL 202 BP 94 EP ANYL PN 1 PG 0 WC Chemistry, Multidisciplinary SC Chemistry GA HG080 UT WOS:A1991HG08000463 ER PT J AU JONES, J WALCH, M MANSFELD, FB AF JONES, J WALCH, M MANSFELD, FB TI ELECTROCHEMICAL STUDIES OF COATED 4140 STEEL EXPOSED TO MIXED MICROBIAL COMMUNITIES UNDER LABORATORY CONDITIONS SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 UNIV SO CALIF,DEPT MAT SCI,LOS ANGELES,CA 90089. USN,CTR SURFACE WARFARE,SILVER SPRING,MD 20903. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 25 PY 1991 VL 202 BP 97 EP BIOT PN 1 PG 0 WC Chemistry, Multidisciplinary SC Chemistry GA HG080 UT WOS:A1991HG08000606 ER PT J AU PASTERNACK, L AF PASTERNACK, L TI HOMOGENEOUS GAS-PHASE MODELING OF BORON OXYGEN HYDROGEN CARBON COMBUSTION SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 USN,RES LAB,DIV CHEM,WASHINGTON,DC 20375. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 25 PY 1991 VL 202 BP 97 EP FUEL PN 1 PG 0 WC Chemistry, Multidisciplinary SC Chemistry GA HG080 UT WOS:A1991HG08001880 ER PT J AU LITTLE, B JONES, J AF LITTLE, B JONES, J TI SULFUR ISOTOPES IN COPPER SULFIDE CORROSION PRODUCTS AS A RESULT OF SULFATE-REDUCING BACTERIA SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 USN,OCEANOG & ATMOSPHER RES LAB,BAY ST LOUIS,MS 39529. USN,CTR SURFACE WARFARE,SILVER SPRING,MD 20903. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 25 PY 1991 VL 202 BP 100 EP BIOT PN 1 PG 0 WC Chemistry, Multidisciplinary SC Chemistry GA HG080 UT WOS:A1991HG08000609 ER PT J AU MCNIEL, MB AF MCNIEL, MB TI PSEUDOMORPH AND ARTIFACT CORROSION STUDIES AS TOOLS FOR BIOMINERALIZATION RESEARCH SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 USN,CTR COASTAL SYST,PANAMA CITY,FL 32407. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 25 PY 1991 VL 202 BP 101 EP BIOT PN 1 PG 0 WC Chemistry, Multidisciplinary SC Chemistry GA HG080 UT WOS:A1991HG08000610 ER PT J AU LADOUCEUR, HD FLEMING, JW AF LADOUCEUR, HD FLEMING, JW TI A TIME-DEPENDENT FLAME MODEL UTILIZING THE METHOD OF LINES SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 USN,RES LAB,DIV CHEM,WASHINGTON,DC 20375. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 25 PY 1991 VL 202 BP 125 EP FUEL PN 1 PG 0 WC Chemistry, Multidisciplinary SC Chemistry GA HG080 UT WOS:A1991HG08001907 ER PT J AU FLEMING, JW BURTON, KA LADOUCEUR, HD AF FLEMING, JW BURTON, KA LADOUCEUR, HD TI LASER-INDUCED FLUORESCENCE DIAGNOSTICS AND MODELING OF 10-TORR METHANE OXYGEN FLAMES SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 USN,RES LAB,DIV CHEM,WASHINGTON,DC 20375. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 25 PY 1991 VL 202 BP 128 EP FUEL PN 1 PG 0 WC Chemistry, Multidisciplinary SC Chemistry GA HG080 UT WOS:A1991HG08001910 ER PT J AU HENDERSHOT, DG PAZIK, JC BERRY, AD AF HENDERSHOT, DG PAZIK, JC BERRY, AD TI SYNTHESIS AND PROPERTIES OF NEW ANTIMONY PRECURSORS FOR OMCVD SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 USN,RES LAB,WASHINGTON,DC 20375. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 25 PY 1991 VL 202 BP 135 EP COLL PN 1 PG 0 WC Chemistry, Multidisciplinary SC Chemistry GA HG080 UT WOS:A1991HG08001532 ER PT J AU COLTON, RJ BURNHAM, NA GANS, BI POLLOCK, HM HARRISON, JA AF COLTON, RJ BURNHAM, NA GANS, BI POLLOCK, HM HARRISON, JA TI PROBING THE SURFACE FORCES OF MATERIALS USING ATOMIC FORCE MICROSCOPY SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 USN,RES LAB,DIV CHEM,WASHINGTON,DC 20375. RI Burnham, Nancy/A-5210-2013 NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 25 PY 1991 VL 202 BP 154 EP PHYS PN 2 PG 0 WC Chemistry, Multidisciplinary SC Chemistry GA HG081 UT WOS:A1991HG08100690 ER PT J AU HONEYCHUCK, RV AF HONEYCHUCK, RV TI NOVEL 3RD ORDER NLO MATERIALS FROM 96-PERCENT QUINOLINE SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 GEORGE MASON UNIV,DEPT CHEM,FAIRFAX,VA 22030. USN,RES LAB,DIV CHEM,WASHINGTON,DC 20375. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 25 PY 1991 VL 202 BP 212 EP POLY PN 2 PG 0 WC Chemistry, Multidisciplinary SC Chemistry GA HG081 UT WOS:A1991HG08101111 ER PT J AU LEE, KE HIGA, KT AF LEE, KE HIGA, KT TI THE SYNTHESIS AND CHARACTERIZATION OF ME2GAC=CSIME3 AND ITS REACTION WITH PRIMARY AND SECONDARY PHOSPHINES SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 USN,CTR WEAP,DEPT RES,DIV CHEM,CHINA LAKE,CA 93555. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 25 PY 1991 VL 202 BP 217 EP INOR PN 1 PG 0 WC Chemistry, Multidisciplinary SC Chemistry GA HG080 UT WOS:A1991HG08002270 ER PT J AU SIMPSON, KM GEDRIDGE, RW HIGA, KT AF SIMPSON, KM GEDRIDGE, RW HIGA, KT TI SYNTHESIS, CHARACTERIZATION, AND PROPERTIES OF ORGANOINDIUM PRECURSORS FOR OMVPE SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 USN,CTR WEAP,DEPT RES,DIV CHEM,CHINA LAKE,CA 93555. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 25 PY 1991 VL 202 BP 218 EP INOR PN 1 PG 0 WC Chemistry, Multidisciplinary SC Chemistry GA HG080 UT WOS:A1991HG08002271 ER PT J AU GROSHENS, T HIGA, KT AF GROSHENS, T HIGA, KT TI SYNTHESIS, CHARACTERIZATION, AND PROPERTIES OF ARSINO-GROUP-12 ORGANOMETALLIC COMPOUNDS SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 USN,CTR WEAP,DEPT RES,DIV CHEM,CHINA LAKE,CA 93555. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 25 PY 1991 VL 202 BP 219 EP INOR PN 1 PG 0 WC Chemistry, Multidisciplinary SC Chemistry GA HG080 UT WOS:A1991HG08002272 ER PT J AU GEDRIDGE, RW BRANDSMA, L NISSAN, RA VERKRUIJSSE, HD HARDER, S DEJONG, RIP OCONNER, CJ AF GEDRIDGE, RW BRANDSMA, L NISSAN, RA VERKRUIJSSE, HD HARDER, S DEJONG, RIP OCONNER, CJ TI SYNTHESIS AND CHARACTERIZATION OF SYMMETRICAL DI(1-ALKYNYL)TELLURIDES SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 USN,CTR WEAP,DEPT RES,DIV CHEM,CHINA LAKE,CA 93555. UNIV UTRECHT,DEPT PREPARAT ORGAN CHEM,3584 CH UTRECHT,NETHERLANDS. UNIV NEW ORLEANS,DEPT CHEM,NEW ORLEANS,LA 70148. RI Institute (DINS), Debye/G-7730-2014 NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 25 PY 1991 VL 202 BP 229 EP INOR PN 1 PG 0 WC Chemistry, Multidisciplinary SC Chemistry GA HG080 UT WOS:A1991HG08002282 ER PT J AU JOHNSON, CE GROSHENS, TJ HIGA, KT AF JOHNSON, CE GROSHENS, TJ HIGA, KT TI SYNTHESIS AND FILM GROWTH-STUDIES OF DI-TERT-BUTYLPHOSPHINO(DIETHYL)-BORANE SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 USN,CTR WEAP,DEPT RES,DIV CHEM,CHINA LAKE,CA 93555. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 25 PY 1991 VL 202 BP 230 EP INOR PN 1 PG 0 WC Chemistry, Multidisciplinary SC Chemistry GA HG080 UT WOS:A1991HG08002283 ER PT J AU HIGA, KT AF HIGA, KT TI TRIS(ARSINO)ALLANES AND THE CRYSTAL-STRUCTURE OF (TERT-BU2AS)3GA SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 USN,CTR WEAP,DEPT RES,DIV CHEM,CHINA LAKE,CA 93555. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 25 PY 1991 VL 202 BP 231 EP INOR PN 1 PG 0 WC Chemistry, Multidisciplinary SC Chemistry GA HG080 UT WOS:A1991HG08002284 ER PT J AU BHATIA, SK TEIXEIRA, JL SHRIVERLAKE, LC ANDERSON, M CALVERT, JM GEORGER, JH DULCEY, CS HICKMAN, JJ SCHOEN, PE LIGLER, FS AF BHATIA, SK TEIXEIRA, JL SHRIVERLAKE, LC ANDERSON, M CALVERT, JM GEORGER, JH DULCEY, CS HICKMAN, JJ SCHOEN, PE LIGLER, FS TI IMMOBILIZATION OF PROTEINS IN MICROLITHOGRAPHICALLY DEFINED PATTERNS SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 GEOCENTERS INC,FT WASHINGTON,MD 20744. USN,RES LAB,CTR BIOMOLEC SCI & ENGN,WASHINGTON,DC 20375. SCI APPLICAT INT CORP,MCLEAN,VA 22102. NR 1 TC 0 Z9 0 U1 0 U2 1 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 25 PY 1991 VL 202 BP 246 EP BIOT PN 1 PG 0 WC Chemistry, Multidisciplinary SC Chemistry GA HG080 UT WOS:A1991HG08000752 ER PT J AU TALUKDER, MAH NORRIS, WP STEPHENS, TS YEE, RY NADLER, MP NISSAN, RA LINDSAY, GA AF TALUKDER, MAH NORRIS, WP STEPHENS, TS YEE, RY NADLER, MP NISSAN, RA LINDSAY, GA TI NEW COMB-SHAPED POLYMERS SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 USN,CTR WEAP,RES DEPT,DIV CHEM,CHINA LAKE,CA 93555. RI Stephens, Thomas/D-9512-2012 NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 25 PY 1991 VL 202 BP 268 EP POLY PN 2 PG 0 WC Chemistry, Multidisciplinary SC Chemistry GA HG081 UT WOS:A1991HG08101167 ER PT J AU PASTERNACK, LR RICE, JK AF PASTERNACK, LR RICE, JK TI ALH GAS-PHASE REACTION-KINETICS SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 USN,RES LAB,DIV CHEM,WASHINGTON,DC 20375. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 25 PY 1991 VL 202 BP 301 EP PHYS PN 2 PG 0 WC Chemistry, Multidisciplinary SC Chemistry GA HG081 UT WOS:A1991HG08100834 ER PT J AU LEE, KE HIGA, KT AF LEE, KE HIGA, KT TI THE PREPARATION OF POTENTIAL SINGLE-SOURCE PRECURSORS TO THE MOCVD OF GAP SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 USN,CTR WEAP,DEPT RES,DIV CHEM,CHINA LAKE,CA 93555. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 25 PY 1991 VL 202 BP 304 EP INOR PN 1 PG 0 WC Chemistry, Multidisciplinary SC Chemistry GA HG080 UT WOS:A1991HG08002357 ER PT J AU HENDERSHOT, DG PAZIK, JC GEORGE, C BERRY, AD AF HENDERSHOT, DG PAZIK, JC GEORGE, C BERRY, AD TI SYNTHESIS AND CHARACTERIZATION OF NEOPENTYLANTIMONY COMPOUNDS SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 USN,RES LAB,WASHINGTON,DC 20375. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 25 PY 1991 VL 202 BP 306 EP INOR PN 1 PG 0 WC Chemistry, Multidisciplinary SC Chemistry GA HG080 UT WOS:A1991HG08002359 ER PT J AU HIGA, KT AF HIGA, KT TI PREPARATION AND CHARACTERIZATION OF MONOMERIC AND DIMERIC ARSINO AND PHOSPHINOGALLANES SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 USN,CTR WEAP,DEPT RES,DIV CHEM,CHINA LAKE,CA 93555. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 25 PY 1991 VL 202 BP 308 EP INOR PN 1 PG 0 WC Chemistry, Multidisciplinary SC Chemistry GA HG080 UT WOS:A1991HG08002361 ER PT J AU SOTO, M PAGE, M MCKEE, ML AF SOTO, M PAGE, M MCKEE, ML TI REACTION-PATH AND RATE CALCULATIONS OF DIFFERENT CHANNELS OF H+HNO SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 USN,RES LAB,WASHINGTON,DC 20375. AUBURN UNIV,DEPT CHEM,AUBURN,AL 36849. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 25 PY 1991 VL 202 BP 310 EP PHYS PN 2 PG 0 WC Chemistry, Multidisciplinary SC Chemistry GA HG081 UT WOS:A1991HG08100843 ER PT J AU BRENNER, DW AF BRENNER, DW TI MOLECULAR-DYNAMICS SIMULATIONS OF DIAMOND FILMS - STRUCTURE, GROWTH AND PROPERTIES SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 USN,RES LAB,WASHINGTON,DC 20375. RI Brenner, Donald/D-1741-2009 NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 25 PY 1991 VL 202 BP 354 EP PHYS PN 2 PG 0 WC Chemistry, Multidisciplinary SC Chemistry GA HG081 UT WOS:A1991HG08100887 ER PT J AU PEDERSON, MR JACKSON, KA AF PEDERSON, MR JACKSON, KA TI ABSORBED HYDROGEN AND FLUORINE NEAR THE DIAMOND VAPOR INTERFACE SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 USN,RES LAB,COMPLEX SYST THEORY BRANCH,WASHINGTON,DC 20375. GEORGE MASON UNIV,DEPT PHYS,FAIRFAX,VA 22030. NR 0 TC 0 Z9 0 U1 1 U2 1 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 25 PY 1991 VL 202 BP 359 EP PHYS PN 2 PG 0 WC Chemistry, Multidisciplinary SC Chemistry GA HG081 UT WOS:A1991HG08100892 ER PT J AU PARENT, DC AF PARENT, DC TI FORMATION OF THE GAS-PHASE ALUMINUM SULFIDE CATIONS ALXSY+ AND THEIR REACTIONS WITH NO2 SO CHEMICAL PHYSICS LETTERS LA English DT Article ID IONS; CO AB Aluminum sulfide cations were formed by direct laser vaporization of Al2S3 in a Fourier transform mass spectrometer. The most abundant series of ions is the mono-metal sulfides AlS(y)+ (y = 1-6). The Al5(S/O)7+ and Al7(S/O)10+ ion series provide evidence for surface reactions of the bulk Al2S3 with background water. Substitution of oxygen for sulfur in reactions with NO2 indicates that oxygen is more strongly bound to aluminum than sulfur. These reactions also suggest that the mono-metal ions consist of multiple S and S2 ligands bonded to the metal, with the exception of AlS6+ which may have a sulfur ring ligand. RP PARENT, DC (reprint author), USN,RES LAB,DIV CHEM,CODE 6113,WASHINGTON,DC 20375, USA. NR 10 TC 12 Z9 12 U1 0 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0009-2614 J9 CHEM PHYS LETT JI Chem. Phys. Lett. PD AUG 23 PY 1991 VL 183 IS 1-2 BP 45 EP 50 DI 10.1016/0009-2614(91)85097-G PG 6 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA GD325 UT WOS:A1991GD32500009 ER PT J AU PARENT, DC AF PARENT, DC TI MIXED ALUMINUM AND INDIUM OXIDE CATIONS - CONTROLLING REACTIVITY SO CHEMICAL PHYSICS LETTERS LA English DT Article ID ALLOY CLUSTERS; GAS-PHASE; GALLIUM; IONS AB Direct laser vaporization of pellets made of aluminum oxide and indium oxide was used to form mixed-metal oxide cations in a Fourier transform mass spectrometer. Indium-rich species dominate the ion abundance distribution, even when a 17-to-1 molar ratio of aluminum to indium is used. The reactivity of two series of ions, Al(x)In(y)O+ (x+y = 2) and Al(x)In(y)O2+(x+y = 3), with N2O and NO2 was studied. The presence of indium in the reactant ion acts to strongly inhibit oxidation. RP PARENT, DC (reprint author), USN,RES LAB,DIV CHEM,CODE 6113,WASHINGTON,DC 20375, USA. NR 13 TC 9 Z9 9 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0009-2614 J9 CHEM PHYS LETT JI Chem. Phys. Lett. PD AUG 23 PY 1991 VL 183 IS 1-2 BP 51 EP 54 DI 10.1016/0009-2614(91)85098-H PG 4 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA GD325 UT WOS:A1991GD32500010 ER PT J AU RIVIERE, GR WAGONER, MA BAKERZANDER, SA WEISZ, KS ADAMS, DF SIMONSON, L LUKEHART, SA AF RIVIERE, GR WAGONER, MA BAKERZANDER, SA WEISZ, KS ADAMS, DF SIMONSON, L LUKEHART, SA TI IDENTIFICATION OF SPIROCHETES RELATED TO TREPONEMA-PALLIDUM IN NECROTIZING ULCERATIVE GINGIVITIS AND CHRONIC PERIODONTITIS SO NEW ENGLAND JOURNAL OF MEDICINE LA English DT Article ID PHAGEDENIS BIOTYPE REITER; MONOCLONAL-ANTIBODY; NICHOLS; SERUM; POLYPEPTIDES; DIAGNOSIS; PERTENUE; PROTEINS; DISEASE AB Background. Spirochetes are commonly associated with periodontal disease, but it is not known whether these treponemes are pathogenic or merely opportunistic. We sought to determine whether spirochetes present in periodontal disease share antigens thought to be unique to spirochetes that are known pathogens. Methods. We examined dental plaque from 24 healthy subjects, from ulcerative sites in 17 patients with ulcerative gingivitis, and from areas of involvement in 19 patients with chronic periodontitis, using an immunocytochemical technique with monoclonal antibodies against pathogen-specific determinants on 47-kd and 37-kd molecules from Treponema pallidum subspecies pallidum. Serum was tested against T pallidum by immunoblotting and by serologic assays for syphilis. Results. Spirochetes with a pathogen-specific epitope on a 47-kd molecule were not found in plaque samples from any of the 24 healthy subjects, but they were identified in plaque samples from 11 of 17 patients with ulcerative gingivitis (P < 0.001) and from 10 of 19 patients with periodontitis (P < 0.01). Monoclonal antibodies directed against a 37-kd molecule reacted with spirochetes in plaque samples from 1 of 14 controls, from all 11 patients with gingivitis from whom samples could be obtained (P < 0.001), and from 14 of 19 patients with periodontitis (P < 0.001). Five of 18 normal subjects had IgG against 47-kd and 37-kd molecules, but none had IgG against 14-kd or 12-kd molecules from T. pallidum subspecies pallidum. Among 19 patients with ulcerative gingivitis, IgG was identified against 47-kd molecules in 15, against 37-kd molecules in 12, against 14-kd molecules in 4, and against 12-kd molecules in 15. Conclusions. The spirochetes found in dental plaque from patients with ulcerative gingivitis or chronic periodontitis have antigens that are thought to be unique to pathogenic treponemes. This close antigenic relation suggests that T. pallidum or a closely related organism may be involved in the pathogenesis of periodontal disease. C1 USN,DENT RES INST,GREAT LAKES,IL 60088. UNIV WASHINGTON,SCH MED,DEPT MED,SEATTLE,WA 98195. OREGON HLTH SCI UNIV,SCH DENT,DEPT PERIODONTOL,PORTLAND,OR 97201. RP RIVIERE, GR (reprint author), OREGON HLTH SCI UNIV,SCH DENT,DEPT PEDIAT DENT,611 SW CAMPUS DR,PORTLAND,OR 97201, USA. FU NIAID NIH HHS [AI-18988] NR 27 TC 59 Z9 61 U1 0 U2 1 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 AUG 22 PY 1991 VL 325 IS 8 BP 539 EP 543 DI 10.1056/NEJM199108223250803 PG 5 WC Medicine, General & Internal SC General & Internal Medicine GA GB447 UT WOS:A1991GB44700003 PM 1713299 ER PT J AU PAPACONSTANTOPOULOS, DA SKROCH, JP DREW, GD AF PAPACONSTANTOPOULOS, DA SKROCH, JP DREW, GD TI CALCULATIONS OF THE TOTAL ENERGY, ELECTRON PHONON INTERACTION AND STONER PARAMETER IN THE 5D TRANSITION-METAL HYDRIDES SO JOURNAL OF THE LESS-COMMON METALS LA English DT Article; Proceedings Paper CT INTERNATIONAL SYMP ON METAL-HYDROGEN SYSTEMS, FUNDAMENTALS AND APPLICATIONS CY SEP 02-07, 1990 CL BANFF, CANADA SP ALCAN INT, ATOM ENERGY CANADA, ERGENICS, KOGAKUIN UNIV, DEPT CHEM ENGN, MANITOBA ENERGY AUTHORITY, MAT & ENERGY RES INST JAPAN, ONTARIO HYDRO, RES DIV, UNIV TORONTO, DEPT PHYS ID DENSITY FUNCTIONAL FORMALISM; ELASTIC-CONSTANTS; BAND-STRUCTURE; PDHX; SUPERCONDUCTIVITY; TEMPERATURE; PDDX AB We performed total energy calculations for all the monohydrides of the 5d row of the periodic table using the augmented plane wave method. Using our predicted equilibrium lattice parameters, we have done band structure calculations that explore possibilities for superconductivity and magnetism in these hydrides. C1 SFA INC,LANDOVER,MD. RP PAPACONSTANTOPOULOS, DA (reprint author), USN,RES LAB,COMPLEX SYST THEORY BRANCH,WASHINGTON,DC 20375, USA. NR 14 TC 3 Z9 3 U1 1 U2 5 PU ELSEVIER SCIENCE SA LAUSANNE PI LAUSANNE 1 PA PO BOX 564, 1001 LAUSANNE 1, SWITZERLAND SN 0022-5088 J9 J LESS-COMMON MET PD AUG 20 PY 1991 VL 172 BP 401 EP 410 PN A PG 10 WC Chemistry, Physical; Metallurgy & Metallurgical Engineering SC Chemistry; Metallurgy & Metallurgical Engineering GA GF951 UT WOS:A1991GF95100049 ER PT J AU NGAI, KL AF NGAI, KL TI TEST OF EXPECTED CORRELATION OF POLYMER SEGMENTAL CHAIN DYNAMICS WITH TEMPERATURE-DEPENDENT TIME-SCALE SHIFTS IN CONCENTRATED-SOLUTIONS SO MACROMOLECULES LA English DT Article AB The effects of diluent on intermolecular interactions in polymers are discussed. The coupling model expects that addition of diluent to polymer will decrease both the coupling parameter n and the steepness of the local segmental relaxation time shift factor a(T) in a plot of log a(T) against normalized temperature (T-T(g)/T(g), where T(g) is the glass transition temperature defined as the temperature at which the relaxation time reaches 100 s. Dielectric data of Adachi and Ishida in the system poly(vinyl chloride)-tetrahydrofuran are used to verify these expectations. RP NGAI, KL (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 20 TC 23 Z9 23 U1 0 U2 2 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0024-9297 J9 MACROMOLECULES JI Macromolecules PD AUG 19 PY 1991 VL 24 IS 17 BP 4865 EP 4867 DI 10.1021/ma00017a023 PG 3 WC Polymer Science SC Polymer Science GA GB747 UT WOS:A1991GB74700023 ER PT J AU PECORA, LM CARROLL, TL AF PECORA, LM CARROLL, TL TI PSEUDOPERIODIC DRIVING - ELIMINATING MULTIPLE DOMAINS OF ATTRACTION USING CHAOS SO PHYSICAL REVIEW LETTERS LA English DT Article ID TRANSIENTS; OSCILLATORS; DYNAMICS; SYSTEMS AB The basins of attraction of period-2 attractors can be subdivided into two domains, one for each of the stable trajectories which are one drive cycle apart. This generalizes to period-n attractors. Periodic drive signals can be replaced by certain chaotic signals which result in the elimination of multiple domains of attraction. The attractors are similar to the original ones, but two systems on the same attractor cannot get out of phase with each other. RP PECORA, LM (reprint author), USN,RES LAB,CODE 6341,WASHINGTON,DC 20375, USA. OI Carroll, Thomas/0000-0002-2371-2049 NR 22 TC 42 Z9 42 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 AUG 19 PY 1991 VL 67 IS 8 BP 945 EP 948 DI 10.1103/PhysRevLett.67.945 PG 4 WC Physics, Multidisciplinary SC Physics GA GB699 UT WOS:A1991GB69900004 ER PT J AU WHITTUM, DH SHARP, WM YU, SS LAMPE, M JOYCE, G AF WHITTUM, DH SHARP, WM YU, SS LAMPE, M JOYCE, G TI ELECTRON-HOSE INSTABILITY IN THE ION-FOCUSED REGIME SO PHYSICAL REVIEW LETTERS LA English DT Article ID CHANNEL LASER; PLASMA; BEAM AB A relativistic electron beam propagating through an unmagnetized, underdense plasma exhibits a transverse instability due to the coupling of the beam centroid to plasma electrons at the "ion-channel" edge. The transverse wake field corresponding to this "electron-hose" effect is calculated in the "frozen-field" approximation for a low-current, cylindrical beam in a radially infinite plasma. The asymptotic growth of beam-centroid oscillations is computed, and the growth length is found to be very rapid, indeed much less than the betatron period of the beam. Results for a radially finite plasma and for a slab beam are noted. Damping and saturation mechanisms are discussed. C1 UNIV CALIF BERKELEY LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. UNIV CALIF LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550. USN,RES LAB,WASHINGTON,DC 20375. NR 33 TC 69 Z9 69 U1 0 U2 2 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0031-9007 J9 PHYS REV LETT JI Phys. Rev. Lett. PD AUG 19 PY 1991 VL 67 IS 8 BP 991 EP 994 DI 10.1103/PhysRevLett.67.991 PG 4 WC Physics, Multidisciplinary SC Physics GA GB699 UT WOS:A1991GB69900016 ER PT J AU NEIGHBOURS, JR BUSKIRK, FR MARUYAMA, XK AF NEIGHBOURS, JR BUSKIRK, FR MARUYAMA, XK TI MEASUREMENT OF COHERENT CHERENKOV RADIATION FROM AN INTENSE BEAM OF A PICOSECOND ELECTRON BUNCH - COMMENT SO PHYSICAL REVIEW LETTERS LA English DT Letter ID CERENKOV RADIATION RP NEIGHBOURS, JR (reprint author), USN,POSTGRAD SCH,DEPT PHYS,MONTEREY,CA 93943, USA. NR 7 TC 2 Z9 2 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0031-9007 J9 PHYS REV LETT JI Phys. Rev. Lett. PD AUG 19 PY 1991 VL 67 IS 8 BP 1052 EP 1052 DI 10.1103/PhysRevLett.67.1052 PG 1 WC Physics, Multidisciplinary SC Physics GA GB699 UT WOS:A1991GB69900035 ER PT J AU COULLARD, CR DELGRECO, JG WAGNER, DK AF COULLARD, CR DELGRECO, JG WAGNER, DK TI REPRESENTATIONS OF BICIRCULAR MATROIDS SO DISCRETE APPLIED MATHEMATICS LA English DT Article ID SUBGRAPHS; GRAPHS AB A bicircular matroid is a matroid defined on the edge set of a graph. Two different graphs can have the same bicircular matroid. The first result of this paper is a characterization of the collection of graphs having the same bicircular matroid as a given arbitrary graph. A bicircular matroid can be represented by a matrix over the real numbers that has at most two nonzeros per column. Such a matrix can be viewed as an incidence matrix of a graph. The second result of this paper is that given almost any (in a sense to be made precise) collection of graphs G1,...,G(t) having the same bicircular matroid M, there exist row-equivalent matrices N1,...,N(t) each representing M, such that N(i) is an incidence matrix of G(i) for 1 less-than-or-equal-to i less-than-or-equal-to t. These results form the basis for an algorithm (presented in a subsequent paper) that under certain conditions converts a given linear-programming problem to a generalized-network flow problem. C1 LOYOLA UNIV,DEPT MATH SCI,CHICAGO,IL 60626. OFF NAVAL RES,DIV MATH SCI,ARLINGTON,VA 22217. GEORGE MASON UNIV,DEPT OPERAT RES & APPL STAT,FAIRFAX,VA 22030. RP COULLARD, CR (reprint author), NORTHWESTERN UNIV,DEPT IND ENGN & MANAGEMENT SCI,EVANSTON,IL 60208, USA. NR 15 TC 11 Z9 11 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 AUG 16 PY 1991 VL 32 IS 3 BP 223 EP 240 DI 10.1016/0166-218X(91)90001-D PG 18 WC Mathematics, Applied SC Mathematics GA GD419 UT WOS:A1991GD41900001 ER PT J AU YU, HY SANDAY, SC AF YU, HY SANDAY, SC TI DISCLINATIONS IN BIMATERIALS SO PHYSICA STATUS SOLIDI A-APPLIED RESEARCH LA English DT Article ID GRAIN-BOUNDARIES; ENERGIES; LOOPS AB A general solution of the elastic field in a bimaterial due to a straight stationary disclination is presented. The bimaterial is idealized as two semi-infinite, isotropic, elastic solids either perfectly bonded to or in frictionless contact with each other at the planar interface. The solution is based on the solutions for nuclei of strain in a bimaterial. The elastic fields due to straight wedge and twist disclinations with line vectors parallel to the planar interface are presented as examples. RP YU, HY (reprint author), USN,RES LAB,DIV MAT SCI & TECHNOL,4555 OVERLOOK AVE SW,WASHINGTON,DC 20375, USA. NR 31 TC 15 Z9 16 U1 0 U2 1 PU AKADEMIE VERLAG GMBH PI BERLIN PA MUHLENSTRASSE 33-34, D-13187 BERLIN, GERMANY SN 0031-8965 J9 PHYS STATUS SOLIDI A JI Phys. Status Solidi A-Appl. Res. PD AUG 16 PY 1991 VL 126 IS 2 BP 355 EP 365 DI 10.1002/pssa.2211260207 PG 11 WC Materials Science, Multidisciplinary; Physics, Applied; Physics, Condensed Matter SC Materials Science; Physics GA GM416 UT WOS:A1991GM41600006 ER PT J AU KENNEDY, CA AF KENNEDY, CA TI PNEUMOTHORAX IN AIDS SO ANNALS OF INTERNAL MEDICINE LA English DT Letter RP KENNEDY, CA (reprint author), USN HOSP,SAN DIEGO,CA 92134, USA. NR 5 TC 0 Z9 0 U1 0 U2 0 PU AMER COLL PHYSICIANS PI PHILADELPHIA PA INDEPENDENCE MALL WEST 6TH AND RACE ST, PHILADELPHIA, PA 19106-1572 SN 0003-4819 J9 ANN INTERN MED JI Ann. Intern. Med. PD AUG 15 PY 1991 VL 115 IS 4 BP 328 EP 329 PG 2 WC Medicine, General & Internal SC General & Internal Medicine GA GA764 UT WOS:A1991GA76400020 PM 1854122 ER PT J AU GOLDBERG, L TAMBURRINI, M MEHUYS, D AF GOLDBERG, L TAMBURRINI, M MEHUYS, D TI TECHNIQUE FOR MEASURING FACET REFLECTIVITY AND EFFECTIVE INDEX OF LASER DIODE AMPLIFIERS SO ELECTRONICS LETTERS LA English DT Article DE AMPLIFIERS; LASER DIODES; MEASUREMENT; SEMICONDUCTOR DEVICES AND MATERIALS ID ANTIREFLECTION COATINGS AB A simple method for unambiguous measurement of the effective index, single pass gain and residual facet reflectivity of semiconductor amplifiers is described. The technique relies on propagation of narrow beams injected at an angle into broad area semiconductor amplifier. C1 SPECTRA DIODE LABS,SAN JOSE,CA 95134. RP GOLDBERG, L (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 5 TC 6 Z9 6 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 AUG 15 PY 1991 VL 27 IS 17 BP 1593 EP 1595 DI 10.1049/el:19910997 PG 3 WC Engineering, Electrical & Electronic SC Engineering GA GC497 UT WOS:A1991GC49700058 ER PT J AU APRUZESE, JP BUIE, M AF APRUZESE, JP BUIE, M TI ACHIEVABLE PUMP POWER AND GAIN IN THE AL XI-MG IX PHOTORESONANT X-RAY LASER SO JOURNAL OF APPLIED PHYSICS LA English DT Article ID RADIATION; PLASMAS; DENSITY AB The aluminum-magnesium photoresonant x-ray laser scheme is investigated using detailed atomic models for both elements. The aluminum pump source is assumed to be a Z pinch driven by a current of several MA. It is found that monochromatic pump powers of 100 GW/eV are obtainable within the 48-angstrom aluminum pump line over a broad range (125-400 eV) of pump plasma temperatures. The gain in Mg IX is calculated assuming separations of 1 or 2 cm from the pump plasma. The highest gain appears in the 2s3d 1D2-2s4f 1F3 line at 228 angstrom. However, photoionization as well as resonant photoexcitation appears to be crucial to the success of this scheme. If photoionization by lines other than the pump line is neglected, Mg IX does not exist below approximately 60 eV. In the 60-100-eV Mg plasma temperature range, collisional excitation from low-lying states to the lower laser level severely degrades the gain. However, when photoionization of Mg by all of the strong Al XI lines is taken into account, Mg IX is found to exist at much lower temperatures, leading to respectable gain of approximately 3 cm-1 at 1-cm Al-Mg separation. RP APRUZESE, JP (reprint author), USN,RES LAB,DIV PLASMA PHYS,RADIAT HYDRODYNAM BRANCH,WASHINGTON,DC 20375, USA. NR 26 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 AUG 15 PY 1991 VL 70 IS 4 BP 1957 EP 1961 DI 10.1063/1.349479 PG 5 WC Physics, Applied SC Physics GA GC098 UT WOS:A1991GC09800008 ER PT J AU OCONNELL, RM MARRS, CD AF OCONNELL, RM MARRS, CD TI LINEAR AND NONLINEAR PHOTOCONDUCTIVITY FROM CHARGE-PRODUCING DEFECTS IN CAF2 SO JOURNAL OF APPLIED PHYSICS LA English DT Article ID ALKALINE-EARTH FLUORIDES; LASER-INDUCED BREAKDOWN; CONDUCTIVITY; PULSES AB Room-temperature measurements of linear and nonlinear photoconductivity in CaF2 containing trace amounts of yttrium, lanthanum, and several rare earths are reported and discussed. Linear spectral photoconductivity scans taken over the 1.55- to 6.20-eV range of photon energies produced significant photocurrents above 3 eV. The results are explained in terms of a combination of 4f-5d absorption in Ce+3 and Pr+3 and photoionization of interstitial F- in both nearest-neighbor charge-compensating defects and anion-Frenkel defects. Peak photocurrents induced by focused 950-ns-wide pulses from a 496.5-nm wavelength dye laser increased nonlinearly with increasing laser pulse energy. These results are interpreted as a transition form two-photon conductivity to electron avalanche and the asymptotic approach to the material's laser damage threshold at approximately 27 GW/cm2. C1 USN,CTR WEAP,DEPT RES,DIV PHYS,CHINA LAKE,CA 93555. RP OCONNELL, RM (reprint author), UNIV MISSOURI,DEPT ELECT & COMP ENGN,COLUMBIA,MO 65211, USA. NR 56 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 AUG 15 PY 1991 VL 70 IS 4 BP 2313 EP 2321 DI 10.1063/1.349426 PG 9 WC Physics, Applied SC Physics GA GC098 UT WOS:A1991GC09800062 ER PT J AU GARLAND, NL STANTON, CT NELSON, HH PAGE, M AF GARLAND, NL STANTON, CT NELSON, HH PAGE, M TI TEMPERATURE-DEPENDENCE OF THE KINETICS OF THE REACTION BO+H2-]HBO+H SO JOURNAL OF CHEMICAL PHYSICS LA English DT Article AB We have measured the rate constant for the reaction of BO with H-2 between 690 and 1030 K. The results are compared to transition-state-theory calculations consistent with a revised value for the heat of formation of the product HBO. By scaling the frequency of the doubly degenerate bend of the HHBO transition state in analogy with the isoelectronic HHCN transition state and lowering the calculated barrier from 9.5 to 8.5 kcal/mol, we are able to bring the theoretical and experimental rate constants into excellent agreement. Over the temperature range 300-3000 K, the theoretical rate constant is well represented by k(T) = 7.49 x 10(-23) cm3 s-1 T3.53 exp(- 1590/T). C1 USN,RES LAB,COMPUTAT PHYS & FLUID DYNAM LAB,WASHINGTON,DC 20375. RP GARLAND, NL (reprint author), USN,RES LAB,DIV CHEM,CODE 6110,WASHINGTON,DC 20375, USA. NR 12 TC 25 Z9 25 U1 0 U2 0 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0021-9606 J9 J CHEM PHYS JI J. Chem. Phys. PD AUG 15 PY 1991 VL 95 IS 4 BP 2511 EP 2515 DI 10.1063/1.460955 PG 5 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA GA108 UT WOS:A1991GA10800030 ER PT J AU RIZOS, A FYTAS, G LODGE, TP NGAI, KL AF RIZOS, A FYTAS, G LODGE, TP NGAI, KL TI SOLVENT ROTATIONAL MOBILITY IN POLYSTYRENE AROCLOR AND POLYBUTADIENE AROCLOR SOLUTIONS .2. A PHOTON-CORRELATION SPECTROSCOPIC STUDY SO JOURNAL OF CHEMICAL PHYSICS LA English DT Article ID OSCILLATORY FLOW BIREFRINGENCE; POLYMER-SOLUTIONS; INTEGRAL-EQUATIONS; LIGHT-SCATTERING; GLASS-TRANSITION; DYNAMICS; FREQUENCIES; VISCOSITY; LIQUIDS AB Dynamic depolarized light scattering has been utilized to probe the rotational motion of the solvent Aroclor (A1248) in solutions containing either polystyrene (PS) (C(PS) = 0, 0.086 or 0.146 g/cc) or 1,4-polybutadiene (PB) (C(PB) = 0.062, 0.098, or 0.16 g/cc) near the solution glass transition. The orientational time correlation functions C(VH) (t) for the solvent A1248 were recorded as a function of temperature (- 13 to - 31-degrees-C) over the time range 10(-6)-1 s by photon correlation spectroscopy. A unimodal relaxation time distribution describes C(VH) (t) at temperatures near T(g) and the breadth of the distribution of solvent relaxation time increases upon addition of the polymer. The average orientation time increases in PS/A1248 solutions and decreases in 1,4 PB/A1248 solutions, and the influence of 1,4 PB is temperature dependent. These main experimental results, which provide further support for the notion of polymer-induced modification to the solvent dynamics, are discussed in terms of the Adam-Gibbs description modified according to the coupling relaxation model. C1 UNIV CRETE,DEPT CHEM,GR-71110 HERAKLION,GREECE. USN,RES LAB,WASHINGTON,DC 20375. UNIV MINNESOTA,DEPT CHEM,MINNEAPOLIS,MN 55455. RP RIZOS, A (reprint author), UNIV CRETE,RES CTR CRETE,GR-71110 HERAKLION,GREECE. RI Rizos, Apostolos/F-6807-2011 NR 32 TC 26 Z9 26 U1 0 U2 3 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0021-9606 J9 J CHEM PHYS JI J. Chem. Phys. PD AUG 15 PY 1991 VL 95 IS 4 BP 2980 EP 2987 DI 10.1063/1.461800 PG 8 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA GA108 UT WOS:A1991GA10800082 ER PT J AU BRINK, KH BEARDSLEY, RC NIILER, PP ABBOTT, M HUYER, A RAMP, S STANTON, T STUART, D AF BRINK, KH BEARDSLEY, RC NIILER, PP ABBOTT, M HUYER, A RAMP, S STANTON, T STUART, D TI STATISTICAL PROPERTIES OF NEAR-SURFACE FLOW IN THE CALIFORNIA COASTAL TRANSITION ZONE SO JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS LA English DT Article ID DRIFTER OBSERVATIONS; NORTHERN CALIFORNIA; CURRENT SYSTEM; OREGON; OCEAN; CODE AB During the summers of 1987 and 1988, 77 near-surface satellite-tracked drifters were deployed in or near cold filaments near Point Arena, California (39-degrees-N), and tracked for up to 6 months as part of the Coastal Transition Zone (CTZ) program. The drifters had large drogues centered at 15 m, and the resulting drifter trajectory data set has been analyzed in terms of its Eulerian and Lagrangian statistics. The CTZ drifter results show that the California Current can be characterized in summer and fall as a meandering coherent jet which on average flows southward to at least 30-degrees-N, the southern end of the study domain. From 39-degrees-N south to about 33-degrees-N, the typical core velocities are of O(50 cm s-1) and the current meanders have alongshore wavelengths of O(300 km) and onshore-offshore amplitude of O(100-200 km). The lateral movement of this jet leads to large eddy kinetic energies and large eddy diffusivities, especially north of 36-degrees-N. The initial onshore-offshore component of diffusivity is always greater than the alongshore component in the study domain, but at the southern end, the eddy diffusivity is more isotropic, with scalar single particle diffusivity (K(xx) + K(yy)) of O(8 x 10(7) cm-2 s-1). The eddy diffusivity increases with increasing eddy energy. Finally, a simple volume budget for the 1988 filament observed near 37-degrees-N off Point Arena suggests that subduction can occur in a filament at an average rate of O(10 m d-1) some 200 km offshore, thus allowing the cold water initially in the filament core to sink below the warmer ambient water by the time the surface velocity core has turned back onshore. This process explains why satellite temperature and color imagery tend to "see" only flow proceeding offshore. C1 OREGON STATE UNIV,COLL OCEANOG,CORVALLIS,OR 97331. UNIV CALIF SAN DIEGO,SCRIPPS INST OCEANOG,LA JOLLA,CA 92093. NAVAL POST GRAD SCH,DEPT OCEANOG,MONTEREY,CA 92093. FLORIDA STATE UNIV,DEPT METEOROL,TALLAHASSEE,FL 32306. RP BRINK, KH (reprint author), WOODS HOLE OCEANOG INST,WOODS HOLE,MA 02543, USA. NR 20 TC 70 Z9 70 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-OCEANS JI J. Geophys. Res.-Oceans PD AUG 15 PY 1991 VL 96 IS C8 BP 14693 EP 14706 DI 10.1029/91JC01072 PG 14 WC Oceanography SC Oceanography GA GB337 UT WOS:A1991GB33700004 ER PT J AU KOSRO, PM HUYER, A RAMP, SR SMITH, RL CHAVEZ, FP COWLES, TJ ABBOTT, MR STRUB, PT BARBER, RT JESSEN, P SMALL, LF AF KOSRO, PM HUYER, A RAMP, SR SMITH, RL CHAVEZ, FP COWLES, TJ ABBOTT, MR STRUB, PT BARBER, RT JESSEN, P SMALL, LF TI THE STRUCTURE OF THE TRANSITION ZONE BETWEEN COASTAL WATERS AND THE OPEN OCEAN OFF NORTHERN CALIFORNIA, WINTER AND SPRING 1987 SO JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS LA English DT Article ID SATELLITE-OBSERVATIONS; CONTINENTAL-SHELF; HYDROGRAPHIC OBSERVATIONS; WEST-COAST; AMERICA; VARIABILITY; TEMPERATURE; FILAMENTS; CURRENTS; DRIFTER AB Physical and biological fields in the coastal transition zone off northern California were measured during February, March, May and June 1987 in an extended alongshore region between 60 km and 150 km offshore. The spring transition, as seen in coastal sea level and winds, occurred in mid-March. Surface variability during the two spring cruises was stronger and of larger scale than that seen during the two winter cruises. An equatorward-tending current, flowing along the boundary between low steric sea level inshore and high steric sea level offshore, dominated both the directly-measured (acoustic Doppler current profiler) and geostrophic current fields during spring. Current jets of comparable strength directed both offshore and onshore were seen off Cape Mendocino and Point Arena; these evolved significantly in the 3 weeks between cruises. Inshore of the current, properties associated with upwelled water were found near the surface, including low temperature and high salinity, nutrients and chlorophyll; offshore of the current, waters were warmer, less saline, lower in nutrients and more oligotrophic. Geostrophic and directly measured volume transports in the current were about 2-3 Sv. Isopycnals inshore of the spring upwelling front were displaced vertically by O(40-80 m) from their depths during the winter survey; these displacements extended deep into the water column and were largely independent of depth between 100 and 400 m. Surface mixed layers tended to be deep in winter and shallower inshore of the upwelling front in spring. A connection between the equatorward-tending frontal jet off northern California and the more well-studied California Current further south is suggested by the similarity of their transports and of their dynamic height values. C1 DUKE UNIV,MARINE LAB,BEAUFORT,NC 28516. MONTEREY BAY AQUARIUM RES INST,PACIFIC GROVE,CA 93950. NAVAL POST GRAD SCH,DEPT OCEANOG,MONTEREY,CA 93943. RP KOSRO, PM (reprint author), OREGON STATE UNIV,COLL OCEANOG,OCEANOG ADM BLDG 104,CORVALLIS,OR 97331, USA. OI Kosro, P. Michael/0000-0003-3693-2558 NR 52 TC 84 Z9 84 U1 0 U2 4 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 AUG 15 PY 1991 VL 96 IS C8 BP 14707 EP 14730 DI 10.1029/91JC01210 PG 24 WC Oceanography SC Oceanography GA GB337 UT WOS:A1991GB33700005 ER PT J AU BUCKLIN, A AF BUCKLIN, A TI POPULATION GENETIC RESPONSES OF THE PLANKTONIC COPEPOD METRIDIA-PACIFICA TO A COASTAL EDDY IN THE CALIFORNIA CURRENT SO JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS LA English DT Article ID NORTHERN CALIFORNIA; EVOLUTIONARY TREES; CHARACTERS AB Despite the intermixing that planktonic populations might be expected to experience in the ocean's fluid regime, zooplankton species may be subdivided across their range into genetically distinct populations. This subdivision, or population genetic structure, may be generated by the interplay of biological processes (reproduction, dispersal, differential mortality) and physical forces governing planktonic distributions. Significant population genetic structure in the planktonic copepod Metridia pacifica occurred during a period of upwelling in the coastal transition zone off the west coast of the United States during April and May 1987. During this period a coastal eddy of saline, recently upwelled water was bordered by a southward flowing current stream; offshore waters were nutrient poor and slower flowing. Metridia pacifica was the most abundant copepod in zooplankton samples collected in this domain; the species was sufficiently abundant in 16 samples to allow genetic analysis. Individual copepods were assayed for allozymic variability by polyacrylamide gel electrophoresis. The samples were genetically heterogeneous (by a contingency chi-square analysis of allozymic frequencies). The genetic differentiation of the samples was characteristic of geographically separated conspecific populations. Cladistic (tree building) analyses were used to visualize the genetic relatedness of the 16 samples, based on the similarity of allozymic frequencies. This analysis resulted in two heterogeneous groups (of five and six samples each) and five anomalous samples that neither constituted a third group nor belonged to the two groups. Overlay of these groupings on the dynamic height topographies showed a concordance between the population genetic and oceanographic structures. Five of the six offshore samples belonged to one group; the five samples of the other group were found either in the eddy (two of three central eddy samples) or in the current jet. The remaining five samples were scattered in nearshore regions or in the frontal region between the eddy and offshore. The division of the samples into eddy and offshore groups may result from redistribution by currents of planktonic populations of different geographic origin and distinct genetic character. Thus the eddy may have entrained copepod populations originating from different source regions than the populations in offshore waters. Further genetic analysis on appropriate time and space scales will be required to determine the mechanisms generating structure in oceanic zooplankton. C1 JOHNS HOPKINS UNIV,CHESAPEAKE BAY INST,SHADY SIDE,MD. OFF NAVAL RES,OCEAN BIOL PROGRAM,ARLINGTON,VA 22217. OI Bucklin, Ann/0000-0003-3750-9348 NR 34 TC 30 Z9 31 U1 0 U2 5 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 AUG 15 PY 1991 VL 96 IS C8 BP 14799 EP 14808 DI 10.1029/91JC01209 PG 10 WC Oceanography SC Oceanography GA GB337 UT WOS:A1991GB33700010 ER PT J AU HUYER, A KOSRO, PM FLEISCHBEIN, J RAMP, SR STANTON, T WASHBURN, L CHAVEZ, FP COWLES, TJ PIERCE, SD SMITH, RL AF HUYER, A KOSRO, PM FLEISCHBEIN, J RAMP, SR STANTON, T WASHBURN, L CHAVEZ, FP COWLES, TJ PIERCE, SD SMITH, RL TI CURRENTS AND WATER MASSES OF THE COASTAL TRANSITION ZONE OFF NORTHERN CALIFORNIA, JUNE TO AUGUST 1988 SO JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS LA English DT Article ID CURRENT SYSTEM; SEASONAL VARIABILITY; CONTINENTAL-SHELF; UPWELLING REGION; POINT ARENA; TEMPERATURE; OREGON; FILAMENTS; VELOCITY; DRIFTER AB In summer 1988, we made repeated mesoscale surveys of a grid extending 200 km offshore between 37-degrees-N and 39-degrees-N in the coastal transition zone off northern California, obtaining continuous acoustic Doppler current profiler data and conductivity-temperature-depth data at standard stations 25 km apart on alongshore sections 40 km apart. All surveys showed a baroclinic equatorward jet, with core velocities of > 50 cm s-1 at the surface decreasing to about 10 cm s-1 at 200 m, a width of 50-75 km, and a baroclinic transport of about 4 Sv. The core of the jet lay between the 8.6 and 9.4 m2 s-2 contours of geopotential anomaly (relative to 500 dbar). Three current meter moorings, deployed at 25-km separation across the jet at the beginning of the survey sequence, provided time-series of the velocity; throughout the 37-day deployment, at least one mooring was within the core defined by the 8.6 and 9.4 m2 s-2 contours. The jet flowed southwestward across the grid from late June until mid-July 1988, when the jet axis moved offshore in the north and onshore in the southern portion of the grid. Temperature-salinity analysis shows that jet waters can be distinguished from both the freshly upwelled coastal waters and the offshore waters. Isopycnal maps indicate alongshore advection of relatively fresh, cool water from farther north, as well as small-scale patchiness not resolved by our survey grid. The baroclinic jet observed here may be continuous with the core of the California Current off central California. The later surveys clearly showed a poleward-flowing undercurrent adjacent to the continental slope, with core velocities up to 20 cm s-1 at depths of 150-250 m. Its baroclinic transport (relative to 500 dbar) increased from < 0.5 Sv to > 1.0 Sv between late June and early August 1988. Within the survey grid, there was a definite onshore gradient in the characteristics of North Pacific Intermediate Water. The subsurface waters adjacent to the continental margin were warmer and more saline than those offshore, indicating net northward advection by the California Undercurrent over the inshore 100 km and equatorward advection farther from shore. C1 MONTEREY BAY AQUARIUM RES INST,PACIFIC GROVE,CA 93950. NAVAL POST GRAD SCH,DEPT OCEANOG,MONTEREY,CA 93943. UNIV SO CALIF,DEPT GEOL SCI,LOS ANGELES,CA 90089. RP HUYER, A (reprint author), OREGON STATE UNIV,COLL OCEANOG,CORVALLIS,OR 97331, USA. OI Kosro, P. Michael/0000-0003-3693-2558 NR 50 TC 76 Z9 76 U1 1 U2 8 PU AMER GEOPHYSICAL UNION PI WASHINGTON PA 2000 FLORIDA AVE NW, WASHINGTON, DC 20009 SN 0148-0227 J9 J GEOPHYS RES-OCEANS JI J. Geophys. Res.-Oceans PD AUG 15 PY 1991 VL 96 IS C8 BP 14809 EP 14831 DI 10.1029/91JC00641 PG 23 WC Oceanography SC Oceanography GA GB337 UT WOS:A1991GB33700011 ER PT J AU CHAVEZ, FP BARBER, RT KOSRO, PM HUYER, A RAMP, SR STANTON, TP DEMENDIOLA, BR AF CHAVEZ, FP BARBER, RT KOSRO, PM HUYER, A RAMP, SR STANTON, TP DEMENDIOLA, BR TI HORIZONTAL TRANSPORT AND THE DISTRIBUTION OF NUTRIENTS IN THE COASTAL TRANSITION ZONE OFF NORTHERN CALIFORNIA - EFFECTS ON PRIMARY PRODUCTION, PHYTOPLANKTON BIOMASS AND SPECIES COMPOSITION SO JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS LA English DT Article ID EQUATORIAL PACIFIC; OCEAN; VARIABILITY; MATTER; FLOW; SEA AB Conductivity-temperature-depth surveys during 1988 encountered strong baroclinic jets that were evident in acoustic Doppler current profiler and hydrographic data. During June and July 1988 a filament with high surface nitrate, high chlorophyll, abundant populations of neritic centric diatoms, and higher rates of primary production was evident perpendicular to the coast between Point Arena and Point Reyes. However, the high-nutrient and phytoplankton regions were not in the baroclinic jets but were south and inshore of them. Surface water transported offshore by the strong baroclinic jets was found to have relatively low nutrient content, suggesting that the jets themselves do not carry significant levels of coastally upwelled, high-nutrient water to the ocean interior. The low nutrient and salinity content of the jet suggests that the water originated several hundred kilometers upstream. Although the jets themselves do not appear to transport significant levels of nutrients directly from the coastal regime to the oceanic regime, dynamic processes associated with a meandering jet are likely responsible for high surface nutrients found several hundred kilometers offshore. Processes such as upwelling along the sourthern edge of the seaward jet result in significant enrichment of the coastal transition zone and in large blooms of neritic diatoms. During 1988 the high-nutrient, high-phytoplankton filament was present when the survey sequence began but then decayed after a month. The surface and subsurface nitrate fields were coherent with the dynamic topography field throughout the survey sequence; however, the surface and integrated chlorophyll fields were coherent only through the first two surveys. A decrease in phytoplankton biomass began during the third survey coincident with physical changes which occurred in that time frame: (1) an intensification of the undercurrent and (2) changes in the surface circulation from predominantly offshore to predominantly longshore. Understanding the processes responsible for the uncoupling between biology and physics is paramount for realistic biological model of this region. C1 DUKE UNIV,MARINE LAB,DURHAM,NC 27706. OREGON STATE UNIV,COLL OCEANOG,CORVALLIS,OR 97331. NAVAL POST GRAD SCH,DEPT OCEANOG,MONTEREY,CA 93943. RP CHAVEZ, FP (reprint author), MONTEREY BAY AQUARIUM RES INST,160 CENT AVE,PACIFIC GROVE,CA 93950, USA. OI Kosro, P. Michael/0000-0003-3693-2558 NR 50 TC 92 Z9 92 U1 1 U2 13 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 AUG 15 PY 1991 VL 96 IS C8 BP 14833 EP 14848 DI 10.1029/91JC01163 PG 16 WC Oceanography SC Oceanography GA GB337 UT WOS:A1991GB33700012 ER PT J AU RAMP, SR JESSEN, PF BRINK, KH NIILER, PP DAGGETT, FL BEST, JS AF RAMP, SR JESSEN, PF BRINK, KH NIILER, PP DAGGETT, FL BEST, JS TI THE PHYSICAL STRUCTURE OF COLD FILAMENTS NEAR POINT ARENA, CALIFORNIA, DURING JUNE 1987 SO JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS LA English DT Article ID NORTHERN CALIFORNIA; SATELLITE-OBSERVATIONS; BOTTOM TOPOGRAPHY; CONTINENTAL-SHELF; CURRENT SYSTEM; EDDIES; JETS; DRIFTER; MEANDERS; OREGON AB Shipboard conductivity-temperature-depth, acoustic Doppler current profiler, and continuous temperature and salinity observations were made in the coastal transition zone off Point Arena, California (39-degrees-N, 124-degrees-W), during June 15-28, 1987, to describe the hydrographic structure and velocity fields associated with the cold filaments found there. An adaptive sampling plan was used to measure the properties of these filaments, guided in real time by satellite Advanced Very High Resolution Radiometer sea surface temperature imagery and feedback from the situ sensors. The primary feature observed was a large, cool (12.0-degrees-13.5-degrees-C), salty (32.7-33.0 psu) filament which extended over 200 km offshore from Point Arena and exceeded 500 m depth. This feature was bounded in the offshore direction by a continuous equatorward meander, with offshore velocities (60-87 cm s-1) on the northern edge of the cool filament and onshore velocities (69-92 cm s-1) along the southern edge, and persisted for at least 3 weeks. A second feature was advected into the study area from the north by an anticyclonic eddy offshore and later merged with the Point Arena filament. Smaller (30 km wide by 50-100 km long by 50-100 m deep) very cold (10.0-degrees-12.0-degrees-C) high salinity (> 33.0 practical salinity units (psu)) features were observed within the Point Arena filament, but persisted for only 6-10 days. The net volume transport of the larger feature was offshore at approximately 3 x 10(6) m3 s-1 and suggests it was fed by an inflow to the region from the north. The smaller features were correlated with burst of equatorward wind stress on an event by event basis but not with times of large-scale wind stress convergence. Surface drifters deployed during the experiment closely followed the surface dynamic topography. Some of the drifters followed the path of the offshore meander, while others moved south inshore. C1 WOODS HOLE OCEANOG INST,WOODS HOLE,MA 02543. UNIV CALIF SAN DIEGO,SCRIPPS INST OCEANOG,LA JOLLA,CA 92093. RP RAMP, SR (reprint author), NAVAL POST GRAD SCH,DEPT OCEANOG,MONTEREY,CA 93943, USA. NR 43 TC 50 Z9 50 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 AUG 15 PY 1991 VL 96 IS C8 BP 14859 EP 14883 DI 10.1029/91JC01141 PG 25 WC Oceanography SC Oceanography GA GB337 UT WOS:A1991GB33700014 ER PT J AU WASHBURN, L KADKO, DC JONES, BH HAYWARD, T KOSRO, PM STANTON, TP RAMP, S COWLES, T AF WASHBURN, L KADKO, DC JONES, BH HAYWARD, T KOSRO, PM STANTON, TP RAMP, S COWLES, T TI WATER MASS SUBDUCTION AND THE TRANSPORT OF PHYTOPLANKTON IN A COASTAL UPWELLING SYSTEM SO JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS LA English DT Article ID ATTENUATION; POPULATIONS; CALIBRATION; DYNAMICS; SINKING AB Observations during the Coastal Transition Zone (CTZ) experiment in summer 1988 reveal the presence of deep phytoplankton layers in a coastal upwelling system. The layers occur throughout the CTZ study area, including a strong baroclinic jet which was present over the period of the experiment. On the basis of a variety of bio-optical, hydrographic, and geochemical indicators, it is concluded that the water masses associated with the layers result from subduction processes. Criteria are developed for identification of subducted water masses based on the beam attenuation coefficient, chlorophyll fluorescence, and distribution of light in the water column. Temperature-salinity characteristics are consistent with two source regions for the subducted layers, one nearshore and a second farther offshore. Most of the layers correspond to the inshore source which is apparently distributed alongshore. Subducted water masses are found in all six grid surveys of the CTZ experiment and probably result from a variety of physical processes. One of these is flow along sloping isopycnal surfaces due to advection and mixing processes. Advection time scales for flow out the axis of the jet range from a few days to a few weeks, depending on the depth of a particular surface, and the bio-optical indicators for subduction processes persist over these time scales. C1 OREGON STATE UNIV,COLL OCEANOG,CORVALLIS,OR 97331. UNIV CALIF SAN DIEGO,SCRIPPS INST OCEANOG,LA JOLLA,CA 92093. UNIV SO CALIF,HANCOCK INST MARINE STUDIES,LOS ANGELES,CA 90089. NAVAL POST GRAD SCH,DEPT OCEANOG,MONTEREY,CA 93943. OI Kosro, P. Michael/0000-0003-3693-2558 NR 27 TC 53 Z9 53 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 AUG 15 PY 1991 VL 96 IS C8 BP 14927 EP 14945 DI 10.1029/91JC01145 PG 19 WC Oceanography SC Oceanography GA GB337 UT WOS:A1991GB33700017 ER PT J AU RAMP, SR GARWOOD, RW DAVIS, CO SNOW, RL AF RAMP, SR GARWOOD, RW DAVIS, CO SNOW, RL TI SURFACE HEATING AND PATCHINESS IN THE COASTAL OCEAN OFF CENTRAL CALIFORNIA DURING A WIND RELAXATION EVENT SO JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS LA English DT Article ID TURBULENCE CLOSURE MODELS; PLANETARY BOUNDARY-LAYERS; MIXED LAYER; IRRADIANCE; HIERARCHY; SEA AB The difference between the temperature of the ocean at 4-cm and 2-m depth was continuously monitored during a cruise to the coastal transition zone off Point Arena, California (38-degrees-58'N, 123-degrees-45'W), during June 1987. The two temperatures were coincident most of the time but diverged during one nearshore leg of the cruise where large temperature differences (DELTA-T) of up to 4.7-degrees-C were observed between the 4-cm and 2-m sensors, in areas which were separated by regions where the two temperatures were coincident as usual. The spatial scale of this "patchy" thermal structure was about 5-10 km. The Naval Postgraduate School mixed layer model (Garwood, 1977) was used to simulate the near surface stratification when forced by the observed wind stress, surface heating, and optical clarity of the water. The model produced a thin strongly stratified surface layer at stations where exceptionally high turbidity was observed but did not produce such features otherwise. This simple model could not explain the horizontal patchiness in the thermal structure, which was likely due to patchiness in the near-surface chlorophyll distributions or to submesoscale variability of the surface wind stress. C1 CALTECH,JET PROP LAB,PASADENA,CA 91109. RP RAMP, SR (reprint author), NAVAL POST GRAD SCH,DEPT OCEANOG,MONTEREY,CA 93943, USA. NR 26 TC 18 Z9 19 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-OCEANS JI J. Geophys. Res.-Oceans PD AUG 15 PY 1991 VL 96 IS C8 BP 14947 EP 14957 DI 10.1029/91JC01140 PG 11 WC Oceanography SC Oceanography GA GB337 UT WOS:A1991GB33700018 ER PT J AU SNAPPER, CM YAMADA, H MOND, JJ JUNE, CH AF SNAPPER, CM YAMADA, H MOND, JJ JUNE, CH TI CROSS-LINKAGE OF LY-6A/E INDUCES CA2+ TRANSLOCATION IN THE ABSENCE OF PHOSPHATIDYLINOSITOL TURNOVER AND MEDIATES PROLIFERATION OF NORMAL MURINE LYMPHOCYTES-B SO JOURNAL OF IMMUNOLOGY LA English DT Article ID STIMULATORY FACTOR-I; T-CELL ACTIVATION; MONOCLONAL-ANTIBODY; MULTIGENE FAMILY; DIFFERENTIATION ANTIGENS; ENDOPLASMIC-RETICULUM; CDNA CHARACTERIZATION; SIGNAL TRANSDUCTION; ALLOANTIGEN SYSTEM; IFN-GAMMA AB Ly-6A/E is a phosphatidylinositol (PI)-linked membrane protein whose expression is induced or upregulated on normal murine T and B cells by IFN-gamma. Cross-linkage of Ly-6A/E expressed on normal murine T cells stimulates Ca2+ translocation, and in the presence of a protein kinase C (PKC) activator, lymphokine secretion, and cellular proliferation. Utilizing an anti-Ly-6A/E mAb, we studied the effect of cross-linking Ly-6A/E on IFN-gamma-treated resting B cells, for Ca2+ translocation, PI turnover, and cellular proliferation. Since these events are known to be stimulated by cross-linkage of B cell membrane (m)Ig, we compared the changes mediated through these respective membrane proteins. We show that cross-linkage of B cell Ly-6A/E stimulates a large, rapid, and sustained increase in the concentration of intracellular free calcium ([Ca2+]i) comparable in magnitude, though somewhat delayed, relative to that observed after cross-linking of mIg. Cross-linkage of B cell Ly-6A/E does not, however, stimulate detectable PI turnover, in contrast to PI turnover induced by ligation of mIg. Both the Ly-6A/E- and mIg-mediated increase in [Ca2+]i occur through mobilization of internal Ca2+ stores as well as entry of Ca2+ into the cell from the extracellular compartment. Ly-6A/E-mediated Ca2+ translocation appears to be under the regulation of PKC in that short term pretreatment of B cells with the PKC activator, PMA, inhibits the Ly-6A/E- as well as the mIg-mediated increase in [Ca2+]i, whereas prolonged exposure to PMA, under conditions that lead to depletion of PKC, results in an augmentation in Ca2+ translocation after ligation of either Ly-6A/E or mIg. Cocapping studies indicate that Ly-6A/E and mIg cap independently in the B cell membrane, thus suggesting that the Ly-6A/E-induced effects on Ca2+ translocation are not mediated through simultaneous modulation of mIg. Anti-Ly6A/E, by itself, does not stimulate an increase in [H-3]thymidine incorporation by IFN-gamma-treated resting B cells, but induces a striking increase in the presence of PMA. By contrast, anti-Ig by itself stimulates significant increases in [H-3]thymidine incorporation that is inhibited by PMA. Thus, Ly-6A/E is a potent mediator of B cell activation that may use a signal transduction system in quiescent B cells that is distinct from that of the Ag receptor. C1 UNIFORMED SERV UNIV HLTH SCI,DEPT MED,BETHESDA,MD 20814. USN,MED RES CTR,BETHESDA,MD 20814. RP SNAPPER, CM (reprint author), UNIFORMED SERV UNIV HLTH SCI,DEPT PATHOL,4301 JONES BRIDGE RD,BETHESDA,MD 20814, USA. FU NIAID NIH HHS [AI27465] NR 59 TC 17 Z9 17 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 AUG 15 PY 1991 VL 147 IS 4 BP 1171 EP 1179 PG 9 WC Immunology SC Immunology GA GB209 UT WOS:A1991GB20900010 PM 1907991 ER PT J AU BILLMERS, RI DAVIS, J SQUICCIARINI, M AF BILLMERS, RI DAVIS, J SQUICCIARINI, M TI A TUNABLE HOLE-BURNING FILTER FOR LIDAR APPLICATIONS SO OPTICS COMMUNICATIONS LA English DT Article AB The concept of spectral hole-burning in dye-doped polymers is used in a novel filtering scheme. The principles of filter operation are discussed in detail and the performance mathematically modeled for Rhodamine 6G operating at 532 nm. RP BILLMERS, RI (reprint author), USN,CTR AIR DEV,CODE 5012,WARMINSTER,PA 18974, USA. NR 12 TC 0 Z9 0 U1 0 U2 2 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0030-4018 J9 OPT COMMUN JI Opt. Commun. PD AUG 15 PY 1991 VL 85 IS 1 BP 26 EP 30 DI 10.1016/0030-4018(91)90046-G PG 5 WC Optics SC Optics GA GE599 UT WOS:A1991GE59900006 ER PT J AU ZIGLER, A BURKHALTER, PG NAGEL, DJ ROSEN, MD BOYER, K LUK, TS MCPHERSON, A RHODES, CK AF ZIGLER, A BURKHALTER, PG NAGEL, DJ ROSEN, MD BOYER, K LUK, TS MCPHERSON, A RHODES, CK TI PLASMA PRODUCTION FROM ULTRAVIOLET-TRANSMITTING TARGETS USING SUBPICOSECOND ULTRAVIOLET-RADIATION SO OPTICS LETTERS LA English DT Article ID KRF-STAR LASER; WINDOW MATERIALS; ABSORPTION; TEMPERATURE; CALIBRATION; GRADIENTS; CRYSTAL; PULSES AB Plasma produced from ultraviolet-transmitting solid targets undergoing intense (> 10(16) W/cm2) subpicosecond (approximately 600 fs) ultraviolet (248 nm) irradiation have been studied under conditions for which no interfering prepulse plasma is generated. Time and spatially integrated measurements of the x-ray emission for H-like and He-like Mg and Si were found to be consistent with LASNEX calculations that model the laser-target interaction. C1 USN,RES LAB,WASHINGTON,DC 20375. UNIV CALIF LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550. UNIV ILLINOIS,CHICAGO,IL 60680. RP ZIGLER, A (reprint author), FM TECHNOL,FAIRFAX,VA 22032, USA. NR 14 TC 18 Z9 18 U1 2 U2 2 PU OPTICAL SOC AMER PI WASHINGTON PA 2010 MASSACHUSETTS AVE NW, WASHINGTON, DC 20036 SN 0146-9592 J9 OPT LETT JI Opt. Lett. PD AUG 15 PY 1991 VL 16 IS 16 BP 1261 EP 1263 DI 10.1364/OL.16.001261 PG 3 WC Optics SC Optics GA GC117 UT WOS:A1991GC11700015 PM 19776938 ER PT J AU PECORA, LM CARROLL, TL AF PECORA, LM CARROLL, TL TI DRIVING SYSTEMS WITH CHAOTIC SIGNALS SO PHYSICAL REVIEW A LA English DT Article ID OSCILLATORS; RESONANCES; ELEMENTS AB We generalize the idea of driving a stable system to the situation when the drive signal is chaotic. This leads to the concept of conditional Lyapunov exponents and also generalizes the usual criteria of the linear stability theorem. We show that driving with chaotic signals can be done in a robust fashion, rather insensitive to changes in system parameters. The calculation of the stability criteria leads naturally to an estimate for the convergence of the driven system to its stable state. We focus on a homogeneous driving situation that leads to the construction of synchronized chaotic subsystems. We apply these ideas to the Lorenz and Rossler systems, as well as to an electronic circuit and its numerical model. RP PECORA, LM (reprint author), USN,RES LAB,CODE 6341,WASHINGTON,DC 20375, USA. OI Carroll, Thomas/0000-0002-2371-2049 NR 29 TC 836 Z9 914 U1 2 U2 21 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 AUG 15 PY 1991 VL 44 IS 4 BP 2374 EP 2383 DI 10.1103/PhysRevA.44.2374 PG 10 WC Optics; Physics, Atomic, Molecular & Chemical SC Optics; Physics GA GC350 UT WOS:A1991GC35000020 ER PT J AU HASBUN, JE NEE, TW AF HASBUN, JE NEE, TW TI APPLICATION OF A TRANSIENT-HOT-ELECTRON-TRANSPORT GREENS-FUNCTION APPROACH TO A 2-DIMENSIONAL MODEL OF A GAAS/ALXGA1-XAS HETEROJUNCTION SO PHYSICAL REVIEW B LA English DT Article ID MONTE-CARLO; FIELD; SEMICONDUCTORS; HETEROSTRUCTURES; GAAS; CARRIERS; EQUATION; SYSTEMS; DEVICES; SOLIDS AB The Green's-function approach to transient-hot-electron transport of Xing and Ting [Phys. Rev. B 35, 3971 (1987)] is applied to a GaAs/Al(x)Ga(1-x)As heterojunction. Scattering mechanisms, such as remote and background ionized impurity scattering as well as acoustic (via deformation potential and piezoelectric coupling) and polar-optical-phonon contributions, have been included in the force and energy transient state equations. The effect of screening on the ionized impurities by the free carriers has been taken into account approximately. Our results for the transient velocity are in reasonable agreement with available Monte Carlo simulations. Theoretical calculations for the transient velocity and electron temperature have been carried out for electrons with and without electron-electron interactions. C1 USN,CTR WEAP,DIV PHYS,MICHELSON LAB,CHINA LAKE,CA 93555. RP HASBUN, JE (reprint author), W GEORGIA COLL,DEPT PHYS,CARROLLTON,GA 30118, USA. NR 32 TC 13 Z9 14 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 AUG 15 PY 1991 VL 44 IS 7 BP 3125 EP 3132 DI 10.1103/PhysRevB.44.3125 PG 8 WC Physics, Condensed Matter SC Physics GA GC066 UT WOS:A1991GC06600031 ER PT J AU SERENE, JW HESS, DW AF SERENE, JW HESS, DW TI QUASI-PARTICLE PROPERTIES OF THE 2-DIMENSIONAL HUBBARD-MODEL IN A PROPAGATOR-RENORMALIZED FLUCTUATION-EXCHANGE APPROXIMATION SO PHYSICAL REVIEW B LA English DT Note ID FERMI-LIQUID THEORY; STATE AB We calculate the self-energy and thermodynamic potential of the two-dimensional Hubbard model in a propagator-renormalized conserving approximation, for lattices as large as 128 x 128 and temperatures as low as 0.002 times the bandwidth. For densities near quarter filling we see no evidence of deviations from the predictions of Fermi-liquid theory, such as those expected in a Luttinger liquid or a marginal Fermi liquid. RP SERENE, JW (reprint author), USN,RES LAB,COMPLEX SYST THEORY BRANCH,WASHINGTON,DC 20375, USA. OI Serene, Joseph/0000-0002-3233-2531 NR 12 TC 102 Z9 102 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 AUG 15 PY 1991 VL 44 IS 7 BP 3391 EP 3394 DI 10.1103/PhysRevB.44.3391 PG 4 WC Physics, Condensed Matter SC Physics GA GC066 UT WOS:A1991GC06600076 ER PT J AU MEYER, JR HOFFMAN, CA BARTOLI, FJ WOJTOWICZ, T DOBROWOLSKA, M FURDYNA, JK CHU, X FAURIE, JP RAMMOHAN, LR AF MEYER, JR HOFFMAN, CA BARTOLI, FJ WOJTOWICZ, T DOBROWOLSKA, M FURDYNA, JK CHU, X FAURIE, JP RAMMOHAN, LR TI MAGNETIC ACTIVATION OF BIPOLAR PLASMAS IN HGTE-CDTE SUPERLATTICES SO PHYSICAL REVIEW B LA English DT Note ID CYCLOTRON-RESONANCE; GAP; TRANSPORT; ELECTRON; HOLES AB It is shown theoretically that in semimetallic HgTe-CdTe superlattices, there is a critical magnetic field above which minority carriers with density proportional to B - B(crit) are expected to coexist with majority carriers in the zero-temperature limit. Experimental confirmation of the magnetically activated bipolar plasma is provided by low-temperature magneto-optical data showing the emergence of minority holes in an n-type superlattice whenever B > B(crit). C1 UNIV NOTRE DAME,DEPT PHYS,NOTRE DAME,IN 46556. UNIV ILLINOIS,CHICAGO,IL 60680. WORCESTER POLYTECH INST,WORCESTER,MA 01609. RP MEYER, JR (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. RI Ram-Mohan, Ramdas/C-5167-2012; Wojtowicz, Tomasz/A-2887-2017 NR 12 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 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD AUG 15 PY 1991 VL 44 IS 7 BP 3455 EP 3458 DI 10.1103/PhysRevB.44.3455 PG 4 WC Physics, Condensed Matter SC Physics GA GC066 UT WOS:A1991GC06600093 ER PT J AU BRENNER, DW DUNLAP, BI HARRISON, JA MINTMIRE, JW MOWREY, RC ROBERTSON, DH WHITE, CT AF BRENNER, DW DUNLAP, BI HARRISON, JA MINTMIRE, JW MOWREY, RC ROBERTSON, DH WHITE, CT TI GROUP-IV COVALENT CLUSTERS - SI-45 AND C-44 VERSUS SI-44 AND C-45 SO PHYSICAL REVIEW B LA English DT Note ID BONDED CHAIN MODEL; SURFACE; SILICON; CARBON; RECONSTRUCTION; SYSTEMS AB Kaxiras has recently proposed a physically appealing structure for the relatively inert Si45 cluster observed by Elkind, Alford, Weiss, Laakonen, and Smalley. Using empirical potentials and all-electron local-density-functional calculations, we have found that removing the central atom from this structure forms a 44-atom fullerenelike silicon cluster with a nearly identical atomization energy per atom, but removing the central atom from the corresponding 45-atom carbon structure forms a 44-atom carbon fullerene with a significantly higher atomization energy. This key difference between these large silicon and carbon clusters is consistent with experimentally observed cluster distributions and is explained based on the greater tendency for pi-bonding and higher strain energy in carbon. RP BRENNER, DW (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. RI Brenner, Donald/D-1741-2009; OI Mintmire, John/0000-0002-6551-0349; Dunlap, Brett/0000-0003-1356-6559 NR 21 TC 20 Z9 20 U1 1 U2 2 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD AUG 15 PY 1991 VL 44 IS 7 BP 3479 EP 3482 DI 10.1103/PhysRevB.44.3479 PG 4 WC Physics, Condensed Matter SC Physics GA GC066 UT WOS:A1991GC06600099 ER PT J AU PEDERSON, MR JACKSON, KA PICKETT, WE AF PEDERSON, MR JACKSON, KA PICKETT, WE TI LOCAL-DENSITY-APPROXIMATION-BASED SIMULATIONS OF HYDROCARBON INTERACTIONS WITH APPLICATIONS TO DIAMOND CHEMICAL VAPOR-DEPOSITION SO PHYSICAL REVIEW B LA English DT Article ID MOLECULAR-DYNAMICS; FUNCTIONAL THEORY; GROWTH-MECHANISM; EPITAXIAL-GROWTH; ENERGY; ACCURATE; IMPURITY; SYSTEMS; SURFACE; FORCES AB Our automated all-electron local-orbital-based cluster computer codes have been used to study a variety of hydrocarbon interactions providing an atomistic understanding of some processes occurring during diamond chemical vapor deposition. Static and quasidynamical local-spin-density-approximation-based simulations have been used to generate a database of hydrocarbon bond lengths and cohesive energies. In addition, we have calculated adsorbate cohesive energies and studied the effects of steric interference between neighboring adsorbates. RP USN, RES LAB, COMPLEX SYST THEORY BRANCH, WASHINGTON, DC 20375 USA. OI Jackson, Koblar/0000-0002-5342-7978 NR 48 TC 51 Z9 51 U1 0 U2 3 PU AMER PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1098-0121 EI 1550-235X J9 PHYS REV B JI Phys. Rev. B PD AUG 15 PY 1991 VL 44 IS 8 BP 3891 EP 3899 DI 10.1103/PhysRevB.44.3891 PG 9 WC Physics, Condensed Matter SC Physics GA GC995 UT WOS:A1991GC99500041 ER PT J AU LEIVERS, D AF LEIVERS, D TI QUESTIONS ABOUT DNR ORDERS SO JAMA-JOURNAL OF THE AMERICAN MEDICAL ASSOCIATION LA English DT Letter RP LEIVERS, D (reprint author), USN HOSP,DEPT ANESTHESIA,SAN DIEGO,CA 92134, USA. NR 3 TC 0 Z9 0 U1 0 U2 0 PU AMER MEDICAL ASSOC PI CHICAGO PA 515 N STATE ST, CHICAGO, IL 60610 SN 0098-7484 J9 JAMA-J AM MED ASSOC JI JAMA-J. Am. Med. Assoc. PD AUG 14 PY 1991 VL 266 IS 6 BP 795 EP 795 PG 1 WC Medicine, General & Internal SC General & Internal Medicine GA GA073 UT WOS:A1991GA07300021 ER PT J AU YOUNGDALE, ER MEYER, JR HOFFMAN, CA BARTOLI, FJ PARTIN, DL THRUSH, CM HEREMANS, JP AF YOUNGDALE, ER MEYER, JR HOFFMAN, CA BARTOLI, FJ PARTIN, DL THRUSH, CM HEREMANS, JP TI ETALON ENHANCEMENT OF NONLINEAR OPTICAL-RESPONSE IN BI1-XSBX SO APPLIED PHYSICS LETTERS LA English DT Article ID NARROW-GAP SEMICONDUCTORS; COEFFICIENTS; FILMS AB Measurements of the nondegenerate four-wave mixing of CO2 laser beams in a Bi(1-x)Sb(x) film have yielded the largest high-power third-order nonlinear susceptibilities ever reported at that wavelength (chi(3) > 6 X 10(-4) esu at P0 > 2 X 10(5) W/cm2). Furthermore, an etalon effect resulting from the high reflectivity of the Bi(1-x)Sb(x) films at both the air and substrate interfaces leads to an additional enhancement of the four-wave signal by as much as a factor of 30. A theoretical model based on optical modulation of the free-carrier susceptibility gives results which are in excellent agreement with the data. C1 GM CORP,RES LABS,DEPT PHYS,WARREN,MI 48090. RP YOUNGDALE, ER (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 12 TC 5 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 AUG 12 PY 1991 VL 59 IS 7 BP 756 EP 758 DI 10.1063/1.105333 PG 3 WC Physics, Applied SC Physics GA GA596 UT WOS:A1991GA59600002 ER PT J AU ZIGLER, A BURKHALTER, PG NAGEL, DJ BOYER, K LUK, TS MCPHERSON, A SOLEM, JC RHODES, CK AF ZIGLER, A BURKHALTER, PG NAGEL, DJ BOYER, K LUK, TS MCPHERSON, A SOLEM, JC RHODES, CK TI HIGH-INTENSITY GENERATION OF 9-13 A X-RAYS FROM BAF2 TARGETS SO APPLIED PHYSICS LETTERS LA English DT Article ID LASER SYSTEM; 248 NM; PULSES; CALIBRATION; CRYSTAL AB Studies of the interaction of condensed matter with short pulse (approximately 600 fs) high intensity (approximately 10(17) W/cm2) ultraviolet (248 nm) radiation show that intense spatially compact sources for x-ray emission in the kilovolt range (0.5-1.0 X 10(15) W/cm2) can be generated from solid targets at close to the maximum volume specific rate allowed. C1 UNIV ILLINOIS,CHICAGO,IL 60680. FM TECHNOL,FAIRFAX,VA 22032. RP ZIGLER, A (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 20 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 0003-6951 J9 APPL PHYS LETT JI Appl. Phys. Lett. PD AUG 12 PY 1991 VL 59 IS 7 BP 777 EP 778 DI 10.1063/1.106384 PG 2 WC Physics, Applied SC Physics GA GA596 UT WOS:A1991GA59600009 ER PT J AU BLUEM, H JACKSON, RH FREUND, HP PERSHING, DE GRANATSTEIN, VL AF BLUEM, H JACKSON, RH FREUND, HP PERSHING, DE GRANATSTEIN, VL TI DEMONSTRATION OF A NEW FREE-ELECTRON-LASER HARMONIC INTERACTION SO PHYSICAL REVIEW LETTERS LA English DT Article ID NONLINEAR-ANALYSIS; AMPLIFIERS AB The first experimental demonstration of a harmonic free-electron-laser amplifier utilizing a periodic position instability is described for a planar wiggler configuration. The interaction occurs at the even harmonics of the fundamental. A maximum gain of 7 dB was observed over a frequency band ranging from 14 to 15 GHz. The experimental results are compared with predictions from the three-dimensional simulation code WIGGLIN with excellent agreement. Improvements due to a tapered wiggler for this interaction are discussed. C1 LOUISIANA STATE UNIV,BATON ROUGE,LA 70803. RP BLUEM, H (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 14 TC 22 Z9 22 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0031-9007 J9 PHYS REV LETT JI Phys. Rev. Lett. PD AUG 12 PY 1991 VL 67 IS 7 BP 824 EP 827 DI 10.1103/PhysRevLett.67.824 PG 4 WC Physics, Multidisciplinary SC Physics GA GB697 UT WOS:A1991GB69700013 ER PT J AU ADAMS, JH BEAHM, LP TYLKA, AJ AF ADAMS, JH BEAHM, LP TYLKA, AJ TI THE CHARGE STATE OF THE ANOMALOUS COMPONENT - RESULTS FROM THE TRAPPED IONS IN SPACE EXPERIMENT SO ASTROPHYSICAL JOURNAL LA English DT Article DE COSMIC RAYS, ABUNDANCES; COSMIC RAYS, GENERAL ID GALACTIC COSMIC-RAYS; HELIOSPHERIC CURRENT SHEET; NUCLEAR TRACK DETECTORS; LATITUDINAL GRADIENT; OUTER HELIOSPHERE; ENERGY-SPECTRA; OXYGEN; TEMPERATURE; DEPENDENCE; REGISTRATION AB We have used orbit-averaged fluxes observed with the TRapped Ions in Space (TRIS) experiment to investigate the geomagnetic transmission and hence the charge state of the anomalous component of cosmic rays. The observed oxygen flux below approximately 40 MeV per nucleon is more than an order of magnitude larger than what can be accounted for by contemporaneous Galactic cosmic-ray and solar energetic particle fluxes. Smaller excesses are observed in nitrogen and neon, while the fluxes of other elements are well accounted for by these two sources. The excess oxygen flux shows a strong change in slope at approximately 12 MeV per nucleon, indicating that two different sources may be primarily responsible for the excess above and below this energy. The excess flux above 12 MeV per nucleon is consistent in both normalization and shape with a singly ionized anomalous component. By comparing this excess with contemporaneous upper limits on the exomagnetospheric oxygen flux, a fully ionized charge state is ruled out at the 98% confidence level. Comparisons with earlier measurements in a nearly identical orbit suggest that the excess below 12 MeV per nucleon may be due to a trapped oxygen component. C1 USN,RES LAB,EO HULBURT CTR SPACE RES,WASHINGTON,DC 20375. UNIV SPACE RES ASSOC,WASHINGTON,DC. RI Tylka, Allan/G-9592-2014 NR 99 TC 14 Z9 14 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 AUG 10 PY 1991 VL 377 IS 1 BP 292 EP 305 DI 10.1086/170359 PN 1 PG 14 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA FZ463 UT WOS:A1991FZ46300030 ER PT J AU MCELVANY, SW CALLAHAN, JH AF MCELVANY, SW CALLAHAN, JH TI CHEMICAL IONIZATION OF FULLERENES SO JOURNAL OF PHYSICAL CHEMISTRY LA English DT Article ID CARBON CLUSTER IONS; LASER VAPORIZATION; GAS-PHASE; BUCKMINSTERFULLERENE; C-60; PHOTOPHYSICS; C60 AB Chemical ionization of buckminsterfullerence and higher mass fullerenes has been studied by using triple quadrupole mass spectrometry (TQMS) and Fourier transform mass spectrometry (FTMS). High-pressure chemical ionization generates both protonated fullerenes (e.g. C60H+) and adducts of the fullerenes with reagent ions. The proton affinities (PA) of C50 and C70 are determined to be between 204 kcal/mol and 207 kcal/mol by proton-transfer bracketing studies in the FTMS. Reactivity data also suggest that PA(C60) < PA(C70). The stabilities of the protonated fullerenes are probed by collision-induced dissociation, which shows that these species are stable up to relatively high collision energies (approximately 150 eV, lab), above which loss of a hydrogen atom occurs. Higher-mass fullernes (C(n)) are observed in both positive (n = 84) and negative (n = 124) chemical ionization mass spectra. An anomalously high abundance of C70- is typically observed in the negative ion mass spectra and is attributed to a greater electron capture cross section of C70 with respect to that of C60. RP MCELVANY, SW (reprint author), USN,RES LAB,DIV CHEM,CODE 6113,WASHINGTON,DC 20375, USA. NR 29 TC 71 Z9 71 U1 0 U2 3 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0022-3654 J9 J PHYS CHEM-US JI J. Phys. Chem. PD AUG 8 PY 1991 VL 95 IS 16 BP 6186 EP 6191 DI 10.1021/j100169a026 PG 6 WC Chemistry, Physical SC Chemistry GA GA417 UT WOS:A1991GA41700026 ER PT J AU BUNDE, A INGRAM, MD MAASS, P NGAI, KL AF BUNDE, A INGRAM, MD MAASS, P NGAI, KL TI DIFFUSION WITH MEMORY - A MODEL FOR MIXED ALKALI EFFECTS IN VITREOUS IONIC CONDUCTORS SO JOURNAL OF PHYSICS A-MATHEMATICAL AND GENERAL LA English DT Letter ID GLASSES AB We present a novel theory of the mixed alkali effect which focuses on the fact that each alkali prefers and maintains its own distinct characteristic environment in the mixed glass. This leads to mismatch between cations and sites recently occupied by unlike cations, and the existence of a memory effect which strongly influences the process of ion migration. This view of glass is consistent with both EXAFS and infrared measurements, and computer simulations reproduce the essential features of the mixed alkali effect including the mobility crossover and the conductivity minimum. C1 UNIV ABERDEEN,DEPT CHEM,OLD ABERDEEN AB9 2UU,SCOTLAND. USN,RES LAB,WASHINGTON,DC 20375. RP BUNDE, A (reprint author), UNIV HAMBURG,INST THEORET PHYS,JUNGIUSSTR 9,W-2000 HAMBURG 36,GERMANY. RI Maass, Philipp/H-1477-2011 NR 20 TC 50 Z9 50 U1 0 U2 6 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 AUG 7 PY 1991 VL 24 IS 15 BP L881 EP L886 DI 10.1088/0305-4470/24/15/015 PG 6 WC Physics, Multidisciplinary; Physics, Mathematical SC Physics GA GB645 UT WOS:A1991GB64500015 ER PT J AU SCHMITT, HA MUFTI, A AF SCHMITT, HA MUFTI, A TI PATH INTEGRAL FORMALISM FOR OSP(1/2, R) COHERENT STATES SO JOURNAL OF PHYSICS A-MATHEMATICAL AND GENERAL LA English DT Letter ID ORTHOSYMPLECTIC SUPERSYMMETRY; DYNAMICAL SUPERALGEBRA; REPRESENTATIONS; SUPERGROUPS AB A path integral formulation in the representation of coherent states for the non-compact supergroup Osp(1/2, R) is introduced. An expression for the transition amplitude connecting two Osp(1/2, R) coherent states is constructed, and the corresponding canonical equations of motion derived. A set of generalized Poisson brackets is introduced and interpreted. C1 UNIV ARIZONA,ARIZONA MAT DEPT,DEPT PHYS,TUCSON,AZ 85721. RP SCHMITT, HA (reprint author), USN,WARFARE ASSESSMENT CTR,POMONA,CA 91769, USA. NR 23 TC 6 Z9 6 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 AUG 7 PY 1991 VL 24 IS 15 BP L815 EP L819 DI 10.1088/0305-4470/24/15/005 PG 5 WC Physics, Multidisciplinary; Physics, Mathematical SC Physics GA GB645 UT WOS:A1991GB64500005 ER PT J AU BOYER, LL KAXIRAS, E FELDMAN, JL BROUGHTON, JQ MEHL, MJ AF BOYER, LL KAXIRAS, E FELDMAN, JL BROUGHTON, JQ MEHL, MJ TI NEW LOW-ENERGY CRYSTAL-STRUCTURE FOR SILICON SO PHYSICAL REVIEW LETTERS LA English DT Article ID PHASE-TRANSITIONS; AMORPHOUS-SILICON; SI; GE AB A minimum-energy path in strain space has been determined which takes cubic silicon into itself. Energies are computed using the Stillinger-Weber model potential and first-principles total-energy calculations. The energy along this path has an additional minimum, corresponding to a crystal structure with a body-centered-tetragonal lattice and fivefold-coordinated atoms. Lattice-dynamics, molecular-dynamics, and elastic-constant calculations show the structure is stable. C1 SACHS FREEMAN ASSOCIATES INC,LANDOVER,MD 20785. RP BOYER, LL (reprint author), USN,RES LAB,COMPLEX SYST THEORY BRANCH,WASHINGTON,DC 20375, USA. RI Mehl, Michael/H-8814-2016 NR 21 TC 74 Z9 74 U1 0 U2 7 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0031-9007 J9 PHYS REV LETT JI Phys. Rev. Lett. PD AUG 5 PY 1991 VL 67 IS 6 BP 715 EP 718 DI 10.1103/PhysRevLett.67.715 PG 4 WC Physics, Multidisciplinary SC Physics GA FZ348 UT WOS:A1991FZ34800015 ER EF