FN Thomson Reuters Web of Science™ VR 1.0 PT J AU CLAWSON, AR HANSON, CM AF CLAWSON, AR HANSON, CM TI TIN-DOPING OF N+ INP OMVPE LAYERS SO JOURNAL OF ELECTRONIC MATERIALS LA English DT Article DE N-TYPE INP; OMVPE; SN-DOPED INP ID MOLECULAR-BEAM EPITAXY; GROWN GALLIUM-ARSENIDE; LIQUID-PHASE EPITAXY; III-V COMPOUNDS; INDIUM-PHOSPHIDE; GAAS; MOVPE; SN; SEMICONDUCTORS; TETRAETHYLTIN AB Tin as a donor dopant in OMVPE epilayers of InP has been studied for its dependence on growth parameters to assess the nature of the dopant incorporation from a tetraethyltin (TESn) source and to establish reproducible conditions for tailoring carrier concentrations. Free carrier concentrations depend linearly on Sn/In ratio and are independent of PH3 concentration consistent with the impurity incorporation on In-lattice sites. The carrier concentration saturates at 3 x 10(19) cm-3 and is accompanied by excess Sn accumulation on the layer surface. X-ray diffraction shows an expansion of the lattice proportional both to the measured free carrier concentration and to the TESn gas concentration up to solid saturation. The lattice expansion is larger than expected from Sn for In radius substitution. SIMS profiles for abrupt turn-on and turn-off of the dopant source show transient changes of Sn concentration consistent with a Sn surface layer buildup. C1 USN,CTR OCEAN SYST,SAN DIEGO,CA 92152. NR 29 TC 9 Z9 9 U1 1 U2 2 PU MINERALS METALS MATERIALS SOC PI WARRENDALE PA 420 COMMONWEALTH DR, WARRENDALE, PA 15086 SN 0361-5235 J9 J ELECTRON MATER JI J. Electron. Mater. PD MAY PY 1991 VL 20 IS 5 BP 365 EP 372 DI 10.1007/BF02670885 PG 8 WC Engineering, Electrical & Electronic; Materials Science, Multidisciplinary; Physics, Applied SC Engineering; Materials Science; Physics GA FL607 UT WOS:A1991FL60700005 ER PT J AU PROKES, SM GLEMBOCKI, OJ TWIGG, ME WANG, KL AF PROKES, SM GLEMBOCKI, OJ TWIGG, ME WANG, KL TI THE STUDY OF RELAXATION IN ASYMMETRICALLY STRAINED SI1-XGEX/SI SUPERLATTICES SO JOURNAL OF ELECTRONIC MATERIALS LA English DT Article DE RELAXATION; INTERDIFFUSION; STRAINED; SUPERLATTICES ID HETEROJUNCTION BIPOLAR-TRANSISTORS; MOLECULAR-BEAM EPITAXY; LAYER SUPERLATTICES; X-RAY; SILICON; INTERDIFFUSION; DIFFUSION AB Asymmetrically strained Si/SiGe superlattices consisting of 12 nm Si/4 nm Si0.65Ge0.35 have been grown in Si(001) by molecular beam epitaxy (MBE) and studied as a function of thermal treatments. Results indicate that initially, the interdiffusion is very rapid and non-linear, and at later annealing stages a steady-state interdiffusion is attained. Raman spectroscopy has been used to determine the Ge content and the strain independently, and to show that in the very early annealing stages, strain relaxation occurs predominantly by interdiffusion. This is supported by transmission electron microscopy (TEM) which indicates that less than 10% of the initial strain relaxation is caused by dislocation formation. In addition, a low temperature relaxation has been observed which may be related to misoriented SiGe crystallites at the superlattice/substrate interface, and increased in size with annealing at 631-degrees-C. C1 UNIV CALIF LOS ANGELES,DEPT ELECT ENGN,LOS ANGELES,CA 90024. RP PROKES, SM (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 17 TC 7 Z9 7 U1 0 U2 0 PU MINERALS METALS MATERIALS SOC PI WARRENDALE PA 420 COMMONWEALTH DR, WARRENDALE, PA 15086 SN 0361-5235 J9 J ELECTRON MATER JI J. Electron. Mater. PD MAY PY 1991 VL 20 IS 5 BP 389 EP 394 DI 10.1007/BF02670889 PG 6 WC Engineering, Electrical & Electronic; Materials Science, Multidisciplinary; Physics, Applied SC Engineering; Materials Science; Physics GA FL607 UT WOS:A1991FL60700009 ER PT J AU LADLEY, RW CAMPBELL, AD HICKS, ML LI, SH AF LADLEY, RW CAMPBELL, AD HICKS, ML LI, SH TI EFFECTIVENESS OF HALOTHANE USED WITH ULTRASONIC OR HAND INSTRUMENTATION TO REMOVE GUTTA-PERCHA FROM THE ROOT-CANAL SO JOURNAL OF ENDODONTICS LA English DT Article ID ENDODONTIC RETREATMENT; REINSTRUMENTATION AB This study compared halothane and chloroform used with hand or ultrasonic instrumentation to remove gutta-percha and sealer from root canals. Apically extruded debris, residual debris, time for filling removal, and amount of solvent used were determined. The differences in extruded apical debris and radiographically visible residual debris were not significant (p > 0.05). Ultrasonic instrumentation required significantly less time to remove the root canal filling than did hand instrumentation (p = 0.02). The only significant difference in the amount of solvent used occurred when the ultrasonic-chloroform group was compared with the hand instrumentation-chloroform group (p = 0.05). Halothane was found to be an acceptable alternative to chloroform for removing gutta-percha and sealer from the obturated root canal. C1 USN,NAVAL DENT SCH,NATL NAVAL DENT CTR,BETHESDA,MD 20889. USN,DEPT ENDODONT,DENT CLIN,NAVAL STN,MAYPORT,FL. FMFPAC,FSSG 1ST,DENT BN 1ST,DENT CO 13TH,EL TORO,CA. NATL INST DENTAL RES,BIOMETRY SECT,BETHESDA,MD. NR 12 TC 25 Z9 27 U1 0 U2 0 PU WILLIAMS & WILKINS PI BALTIMORE PA 351 WEST CAMDEN ST, BALTIMORE, MD 21201-2436 SN 0099-2399 J9 J ENDODONT JI J. Endod. PD MAY PY 1991 VL 17 IS 5 BP 221 EP 224 PG 4 WC Dentistry, Oral Surgery & Medicine SC Dentistry, Oral Surgery & Medicine GA FK200 UT WOS:A1991FK20000004 PM 1940742 ER PT J AU SPRAGUE, LG SNOW, AW GRIFFITH, JR AF SPRAGUE, LG SNOW, AW GRIFFITH, JR TI THE SYNTHESIS AND ATTEMPTED POLYMERIZATION OF AN ALPHA,BETA,BETA-TRIFLUOROSTYRENE DISUBSTITUTED BY HEXAFLUORO-2-PROPANOL GROUPS SO JOURNAL OF FLUORINE CHEMISTRY LA English DT Article ID ARYL IODIDES; REAGENTS AB The preparation of [(5-(trifluoroethenyl)-1,3-phenylene)bis[2,2,2-trifluoro-1-trifluoromethylethylidene]oxy]-bis[trimethylsilane] 2 in excellent isolated yield from the corresponding aryl iodide 4 is described. The synthesis features conversion of the known dialcohol 3 to the trimethylsilyl ether 4 which gave excellent protection against organometallic reagents and allowed the Pd(PPh3)4 catalyzed coupling with trifluoroethenylzinc bromide. Compound 2 exhibited good thermal stability with little propensity to form the corresponding F-cyclobutane dimer at room temperature. C1 USN,RES LAB,DIV CHEM,WASHINGTON,DC 20375. NR 30 TC 4 Z9 4 U1 2 U2 3 PU ELSEVIER SCIENCE SA LAUSANNE PI LAUSANNE 1 PA PO BOX 564, 1001 LAUSANNE 1, SWITZERLAND SN 0022-1139 J9 J FLUORINE CHEM JI J. Fluor. Chem. PD MAY PY 1991 VL 52 IS 3 BP 301 EP 306 DI 10.1016/S0022-1139(00)80344-9 PG 6 WC Chemistry, Inorganic & Nuclear; Chemistry, Organic SC Chemistry GA FY907 UT WOS:A1991FY90700005 ER PT J AU ENGLE, IM AF ENGLE, IM TI IDEALIZED VOYAGER JOVIAN MAGNETOSPHERE SHAPE AND FIELD SO JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS LA English DT Article ID PLANETARY MAGNETIC-FIELD AB A magnetic field arising from the Jovian equatorial sheet current deduced from Voyager 1 and 2 observations has been added to a planetary dipole field to provide a model of magnetic field inside the magnetopause. This internal field was used to calculate the magnetopause surface in a cyclic process. During each cycle, the surface was calculated, and the resulting field due to currents on the magnetopause was calculated for inclusion in the total field used to calculate the next-order surface. The resulting magnetopause is, as anticipated, flatter in shape than one resulting primarily from a dipole internal field source, but not dissimilar in overall height-to-width configuration to that of the magnetopause calculated for the larger inflated magnetopause observed by Pioneer 10. An array of magnetic field values for locations internal and external to the magnetopause due to currents on the surface has been computed by integrating over the entire magnetopause. A model for the total magnetospheric field of this semi-inflated magnetosphere has been constructed by adding this latter contribution to the internal source fields to obtain a global model of a semi-inflated Jovianlike magnetospheric field. The magnitude of the contribution of the surface currents to the total magnetic field in the region of the orbits of the Galilean satellites is calculated to be considerably larger for this Voyager model than for the Pioneer model. RP ENGLE, IM (reprint author), USN ACAD,DEPT PHYS,ANNAPOLIS,MD 21402, USA. NR 9 TC 12 Z9 12 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 MAY 1 PY 1991 VL 96 IS A5 BP 7793 EP 7802 DI 10.1029/90JA02391 PG 10 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA FL029 UT WOS:A1991FL02900014 ER PT J AU KANG, YH WILLIAMS, R WILLIAMS, TJ AF KANG, YH WILLIAMS, R WILLIAMS, TJ TI EFFECT OF TGF-BETA, THROMBIN, AND GLUCAN ON LEUKOCYTE RECRUITMENT, CELL-PROLIFERATION, AND MATRIX PROTEIN-PRODUCTION IN RAT ENDOMETRIUM SO JOURNAL OF HISTOCHEMISTRY & CYTOCHEMISTRY LA English DT Meeting Abstract C1 USN,MED RES INST,BETHESDA,MD 20889. NR 0 TC 0 Z9 0 U1 0 U2 0 PU HISTOCHEMICAL SOC INC PI NEW YORK PA MT SINAI MEDICAL CENTER 19 EAST 98TH ST SUTIE 9G, NEW YORK, NY 10029 SN 0022-1554 J9 J HISTOCHEM CYTOCHEM JI J. Histochem. Cytochem. PD MAY PY 1991 VL 39 IS 5 BP 724 EP 724 PG 1 WC Cell Biology SC Cell Biology GA FH027 UT WOS:A1991FH02700050 ER PT J AU KOROPCHAK, CM GRAHAM, G PALMER, J WINSBERG, M TING, SF WALLACE, M PROBER, CG ARVIN, AM AF KOROPCHAK, CM GRAHAM, G PALMER, J WINSBERG, M TING, SF WALLACE, M PROBER, CG ARVIN, AM TI INVESTIGATION OF VARICELLA-ZOSTER VIRUS-INFECTION BY POLYMERASE CHAIN-REACTION IN THE IMMUNOCOMPETENT HOST WITH ACUTE VARICELLA SO JOURNAL OF INFECTIOUS DISEASES LA English DT Article ID HUMAN IMMUNODEFICIENCY VIRUS; ENZYMATIC AMPLIFICATION; INSITU HYBRIDIZATION; DNA; CHILDREN; SEQUENCES; VACCINE; TRANSMISSION; CHICKENPOX; RECIPIENTS AB A polymerase chain reaction (PCR) method developed to detect varicella zoster virus (VZV) in clinical samples is based on amplifying sequences of viral gene 31, the coding region for glycoprotein II. Its sensitivity was evaluated by amplification from plasmid VZV DNA containing VZV gene 31; 45 copies were detected in 1-mu-g of human DNA. In testing within 24 h after the onset of varicella exanthem, 21 (75%) of 28 lesion samples were positive by VZV PCR, whereas VZV was isolated from only 21% by a standard tissue culture method. Only 1 (3.3%) of 30 samples of oropharyngeal secretions but peripheral blood mononuclear cells from 8 (67%) of 12 patients were positive. The sensitivity and specificity of the VZV PCR method indicates its usefulness for investigating the pathogenesis of VZV infection. Direct contact with cutaneous lesions rather than respiratory secretions may be the most important route of VZV transmission from healthy individuals with acute varicella. C1 USN HOSP,DEPT INTERNAL MED,DIV INFECT DIS,SAN DIEGO,CA 92134. RP KOROPCHAK, CM (reprint author), STANFORD UNIV,MED CTR,SCH MED,DEPT PEDIAT,DIV INFECT DIS,STANFORD,CA 94305, USA. FU NCI NIH HHS [CA-49605]; NIAID NIH HHS [AI-20459, AI-22280] NR 35 TC 67 Z9 69 U1 0 U2 1 PU UNIV CHICAGO PRESS PI CHICAGO PA 5720 S WOODLAWN AVE, CHICAGO, IL 60637 SN 0022-1899 J9 J INFECT DIS JI J. Infect. Dis. PD MAY PY 1991 VL 163 IS 5 BP 1016 EP 1022 PG 7 WC Immunology; Infectious Diseases; Microbiology SC Immunology; Infectious Diseases; Microbiology GA FH745 UT WOS:A1991FH74500012 PM 1850441 ER PT J AU BROOK, I AF BROOK, I TI PATHOGENICITY OF PROPIONIBACTERIUM-ACNES IN MIXED INFECTIONS WITH FACULTATIVE BACTERIA SO JOURNAL OF MEDICAL MICROBIOLOGY LA English DT Article ID SUBDURAL EMPYEMA; INVITRO AB Single and mixed infections with 11 clinical isolates of Propionibacterium acnes and three facultative bacteria (Staphylococcus aureus, Escherichia coli and Klebsiella pneumoniae) were studied in a subcutaneous abscess model in mice. Abscesses were induced by pure cultures of six of 11 strains of P. acnes and by the three facultative bacteria. The abscesses produced by each of the six "virulent" P. acnes isolates mixed with S. aureus, E. coli or K. pneumoniae were larger than those induced by the single organisms in 16 of the 18 combinations. There was a significant increase in the numbers of the six P. acnes strains in 13 of the 18 bacterial mixtures and in the numbers of the facultative bacteria in 17 of the 18 combinations. These data illustrate the potential virulence of some P. acnes strains and their synergic capacity with facultative bacteria. C1 USN,MED RES INST,BETHESDA,MD 20814. NR 29 TC 10 Z9 10 U1 1 U2 3 PU CHAPMAN HALL LTD PI LONDON PA 2-6 BOUNDARY ROW, LONDON, ENGLAND SE1 8HN SN 0022-2615 J9 J MED MICROBIOL JI J. Med. Microbiol. PD MAY PY 1991 VL 34 IS 5 BP 249 EP 252 PG 4 WC Microbiology SC Microbiology GA FM409 UT WOS:A1991FM40900002 PM 2030499 ER PT J AU WU, CT AF WU, CT TI POLYMORPHISM FOR ACHIEVING EXTENSIBILITY SO JOURNAL OF OBJECT-ORIENTED PROGRAMMING LA English DT Article C1 USN,POSTGRAD SCH,MONTEREY,CA 93940. NR 0 TC 1 Z9 1 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 MAY PY 1991 VL 4 IS 2 BP 58 EP & PG 0 WC Computer Science, Software Engineering; Computer Science, Theory & Methods SC Computer Science GA FN785 UT WOS:A1991FN78500008 ER PT J AU FONTANELLA, JJ WINTERSGILL, MC COUGHLIN, CS MAZAUD, P GREENBAUM, SG AF FONTANELLA, JJ WINTERSGILL, MC COUGHLIN, CS MAZAUD, P GREENBAUM, SG TI APPLICATION OF THE BENDLER-SHLESINGER GENERALIZATION OF THE VOGEL EQUATION TO ION-CONDUCTING POLYMERS SO JOURNAL OF POLYMER SCIENCE PART B-POLYMER PHYSICS LA English DT Article ID OXIDE COPOLYMER NETWORKS; ELECTRICAL-CONDUCTIVITY; HIGH-PRESSURE; RELAXATION; SODIUM; SALTS; NMR; DSC AB Previously published audio frequency electrical conductivity results for ion-conducting polymers have been reanalyzed in terms of the Bendler-Shlesinger (BENSH) generalization of the Vogel equation. The materials studied include poly(propylene oxide) (PPO), amorphous poly(ethylene oxide) (PEO), poly(dimethylsiloxane-ethylene oxide) (PDMS-EO), and polyphosphazene (MEEP) -based material. The BENSH equation provides a better fit of both vacuum and high-pressure data for PPO and PDMS-EO than does the Vogel equation. For MEEP, for which the data are of a lower accuracy, and PEO, for which the data are over a narrower range of temperatures, the Vogel equation provides a better fit. However, for the most reliable data, a systematic difference between the VTF equation and the data is found, while the BENSH equation fits all portions of the data equally well. It is concluded that the BENSH equation, and hence the defect-diffusion model, provides an excellent description of the electrical conductivity for ion-conducting polymers. C1 CUNY HUNTER COLL,DEPT PHYS,NEW YORK,NY 10021. RP FONTANELLA, JJ (reprint author), USN ACAD,DEPT PHYS,ANNAPOLIS,MD 21402, USA. NR 19 TC 16 Z9 16 U1 2 U2 4 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 MAY PY 1991 VL 29 IS 6 BP 747 EP 752 DI 10.1002/polb.1991.090290613 PG 6 WC Polymer Science SC Polymer Science GA FL925 UT WOS:A1991FL92500013 ER PT J AU KARADIMITRIS, A SCOTT, C NETZER, D GANY, A AF KARADIMITRIS, A SCOTT, C NETZER, D GANY, A TI REGRESSION AND COMBUSTION CHARACTERISTICS OF BORON CONTAINING FUELS FOR SOLID FUEL RAMJETS SO JOURNAL OF PROPULSION AND POWER LA English DT Article AB A windowed, two-dimensional solid-fuel-ramjet motor was used with high-speed motion picture cameras to study the effects of fuel composition, pressure, and air mass flux on the surface behavior of metallized fuels within both the recirculation and boundary-layer combustion regions. Surface behavior and near-surface combustion characteristics were examined to help explain the regression rate/performance characteristics observed in actual motor hardware. Fuels containing no combustion catalyst exhibited the characteristics of extending the combustion envelope to lower pressures with lower values of Shore A hardness. Ignition/flammability limits appeared to be a strong function of surface pyrolysis within the recirculation region. Most metallized fuels exhibited shedding of flakes of (unburned) material from the fuel surface. Flake thickness for boron fuels was typically 200-mu, independent of pressure, and surface areas varied from less than 1 mm2 to approximately 22 mm2. The mass losses attributable to the flaking process play a major role in the overall fuel mass loss mechanism. Bimetallic fuels and fuels containing a combustion catalyst apparently had surface reactions which increase the surface temperature. This should be beneficial for obtaining more complete combustion of the metals within the motor. C1 TECHNION ISRAEL INST TECHNOL,FAC AEROSP ENGN,IL-34406 HAIFA,ISRAEL. RP KARADIMITRIS, A (reprint author), USN,POSTGRAD SCH,DEPT AERONAUT & ASTRONAUT,MONTEREY,CA 93943, USA. NR 16 TC 10 Z9 11 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 MAY-JUN PY 1991 VL 7 IS 3 BP 341 EP 347 PG 7 WC Engineering, Aerospace SC Engineering GA FU462 UT WOS:A1991FU46200005 ER PT J AU CHANDRASEKHARA, MS KROTHAPALLI, A BAGANOFF, D AF CHANDRASEKHARA, MS KROTHAPALLI, A BAGANOFF, D TI PERFORMANCE-CHARACTERISTICS OF AN UNDEREXPANDED MULTIPLE JET EJECTOR SO JOURNAL OF PROPULSION AND POWER LA English DT Note C1 STANFORD UNIV,DEPT AERONAUT & ASTRONAUT,STANFORD,CA 94305. FLORIDA A&M UNIV FLORIDA STATE UNIV,COLL ENGN,DEPT MECH ENGN,TALLAHASSEE,FL 32307. USN,NASA,JOINT INST AERONAUT,AMES RES CTR,DEPT AERONAUT & ASTRONAUT,MOFFETT FIELD,CA 94035. RP CHANDRASEKHARA, MS (reprint author), USN,POSTGRAD SCH,MONTEREY,CA 93943, USA. NR 12 TC 5 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 MAY-JUN PY 1991 VL 7 IS 3 BP 462 EP 464 DI 10.2514/3.23348 PG 3 WC Engineering, Aerospace SC Engineering GA FU462 UT WOS:A1991FU46200021 ER PT J AU HARRISON, KM BILLY, EJ PELLEU, GB AF HARRISON, KM BILLY, EJ PELLEU, GB TI EFFECTS OF AN INTERNAL ESCAPE CHANNEL ON A CASTABLE CERAMIC CROWN SO JOURNAL OF PROSTHETIC DENTISTRY LA English DT Article ID FULL COVERAGE CASTINGS; CEMENTATION; IMPROVE; RELIEF AB This study evaluated the adaptation and strength of Dicor castable ceramic crowns cemented using an internal escape channel on the axial wall of the preparation. Twenty-eight crown wax patterns were made on 14 machined brass dies. The adaptation of the crowns was evaluated by measuring the combined height of the die and crown. The results revealed a significant difference in the mean and standard deviation of 16 +/- 13-mu-m in the experimental group and 85 +/- 31-mu-m in the control group. The differences between the force to fracture of 2155 +/- 1188 N and 1040 +/- 658 N, respectively, was also significant. The findings suggested that having an internal escape channel during cementation significantly improved the fit and strength of Dicor castable ceramic crowns. This technique would be particularly beneficial for cementation of posterior castable ceramics. C1 USN,NATL NAVAL DENT CTR,SCH NAVAL DENT,DEPT PROSTHODONT,BETHESDA,MD 20814. USN,NATL NAVAL DENT CTR,SCH NAVAL DENT,RES DEPT,BETHESDA,MD 20814. NR 17 TC 4 Z9 4 U1 0 U2 0 PU MOSBY-YEAR BOOK INC PI ST LOUIS PA 11830 WESTLINE INDUSTRIAL DR, ST LOUIS, MO 63146-3318 SN 0022-3913 J9 J PROSTHET DENT JI J. Prosthet. Dent. PD MAY PY 1991 VL 65 IS 5 BP 622 EP 627 DI 10.1016/0022-3913(91)90195-3 PG 6 WC Dentistry, Oral Surgery & Medicine SC Dentistry, Oral Surgery & Medicine GA FK178 UT WOS:A1991FK17800006 PM 2051382 ER PT J AU SAMMELMANN, GS HACKMAN, RH AF SAMMELMANN, GS HACKMAN, RH TI THE ACOUSTIC SCATTERING BY A SUBMERGED, SPHERICAL-SHELL .2. THE HIGH-FREQUENCY REGION AND THE THICKNESS QUASI-RESONANCE SO JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA LA English DT Article ID LAMB WAVE AB This article presents a fundamentally oriented analysis of the complex-ka plane pole structure of the S matrix for spherical shells in the thickness range 0.02a less-than-or-equal-to h less-than-or-equal-to 0.10a (a is the outer radius of the sphere) for the high-frequency region (100 < ka < 1000); the Poisson's ratio for these shells is fixed at sigma = 0.34 (aluminum). Surprisingly, this analysis reveals that the most dominant feature in the backscattered form function of a thin spherical shell is a single prominent high-frequency peak. The underlying modal structure and accompanying regions of negative group velocity are related to this feature, which is interpreted as a thickness "quasiresonance." In particular, the significance of stationary values of the group velocity to the relative amplitude of modal excitation is emphasized. RP SAMMELMANN, GS (reprint author), USN,CTR COASTAL SYST,PANAMA CITY,FL 32407, USA. NR 13 TC 16 Z9 16 U1 0 U2 2 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0001-4966 J9 J ACOUST SOC AM JI J. Acoust. Soc. Am. PD MAY PY 1991 VL 89 IS 5 BP 2096 EP 2103 DI 10.1121/1.400902 PG 8 WC Acoustics; Audiology & Speech-Language Pathology SC Acoustics; Audiology & Speech-Language Pathology GA FL775 UT WOS:A1991FL77500007 ER PT J AU MELLBERG, LE JOHANNESSEN, OM CONNORS, DN BOTSEAS, G BROWNING, DG AF MELLBERG, LE JOHANNESSEN, OM CONNORS, DN BOTSEAS, G BROWNING, DG TI ACOUSTIC PROPAGATION IN THE WESTERN GREENLAND SEA FRONTAL ZONE SO JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA LA English DT Article ID MARGINAL ICE-ZONE; TRANSMISSIONS AB A study, utilizing numerical experiments, of the environmental acoustic effects of the western Greenland Sea Frontal Zone in the summer of 1983 along a 185-km west to east transect is presented. The transect begins at the edge of the marginal ice zone in the East Greenland Current, then crosses the East Greenland Polar Front and terminates in the water of the Greenland Sea gyre. The transect contains several mesoscale eddylike features and a sharp front between Return Atlantic Intermediate Water and Greenland Arctic Intermediate Water, whose effects on an acoustic field have not been previously reported. This front can impart > 15-dB increase in loss in < 10 km. The effects of the frontal zone on acoustic propagation as a function of location and depth of the acoustic source and depth of the receiver for a nominal frequency of 50 Hz are discussed. Significant differences, sometimes greater than 20 dB, in the acoustic field were observed and are explained in the analysis for variations in any of the source and receiver parameters. The sound-speed structure on either side of the frontal zone makes propagation loss and the dominant acoustic modes very dependent on direction and location. The direction of propagation with the lowest loss (as much as 15-dB difference along the entire transect) can change with a modest shift in source from a 10-m depth to 150 m. As compared to the nonfrontal environment, propagation in the presence of the frontal zone, for any of the source and receiver depths studied, can result in changes in the levels and distribution of energy in the acoustic field by as much as 15 dB as well as changes in the mode of propagation (e.g., refracted/surface reflected to SOFAR). It can also result in an increase (> 10 dB) in the sensitivity of propagation loss to changes in receiver depth (10-150 m) compared to the nonfrontal zone environment. A significant finding is that a longer transmission range (93 km) through the waters of a frontal zone can reduce the effects of crossing the front itself by as much as 15 dB. It was also observed that 75 km of upslope propagation that included two oceanic fronts was unaffected by a decrease in bottom depth of 2000 m within the 75-km range. C1 USN,CTR UNDERWATER SYST,NEWPORT,RI 02841. UNIV BERGEN,NANSEN OCEANOG & REMOTE SENSING CTR,INST GEOPHYS,N-5014 BERGEN,NORWAY. NR 21 TC 5 Z9 7 U1 1 U2 2 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0001-4966 J9 J ACOUST SOC AM JI J. Acoust. Soc. Am. PD MAY PY 1991 VL 89 IS 5 BP 2144 EP 2156 DI 10.1121/1.400908 PG 13 WC Acoustics; Audiology & Speech-Language Pathology SC Acoustics; Audiology & Speech-Language Pathology GA FL775 UT WOS:A1991FL77500013 ER PT J AU MELLBERG, LE ROBINSON, AR BOTSEAS, G AF MELLBERG, LE ROBINSON, AR BOTSEAS, G TI AZIMUTHAL VARIATION OF LOW-FREQUENCY ACOUSTIC PROPAGATION THROUGH ASYMMETRIC GULF-STREAM EDDIES SO JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA LA English DT Article ID OPEN OCEAN MODEL; WARM-CORE RINGS; MESOSCALE EDDIES; EDDY; MEANDER; REFRACTION; DECAY; SOUND AB A numerical modeling study of the azimuthal variation of 25-Hz acoustic propagation through radially asymmetric Gulf Stream eddies is presented. Both a cold-core (cyclonic) and a warm-core (anticyclonic) eddy, which are quasi-elliptical in shape, are investigated. Sources located both inside and outside the eddies are considered with transmission out to 240 km. The source is at a depth of 150 m where there are substantial environmental variations due to eddies. Receivers are at depths of 100, 150, and 300 m. The dimensions of the first four convergence zones (CZ) are utilized as indicators of the azimuthal variation of propagation. Propagation conditions assumed an absorbing bottom and no azimuthal coupling of energy. Sensitivity to change in azimuth is dependent upon the orientation of the eddy relative to the direction of transmission. It is increased for transmission paths parallel to the major axis relative to those parallel to the minor axis. For propagation parallel to the major axis, a 15-degrees change in azimuth can result in a change of as much as 13 km in width and 15 km in range for the third CZ. An irregularity in the shape of a quasi-elliptical eddy is shown to effect an appreciable difference in transmission. A 30-degrees shift in the direction of propagation to the right side of the major axis of a cold-core eddy produced a 20% change in the width of the third CZ, while a 30-degrees shift to the left side of the axis gave a 64% change in the width. Sensitivity can depend upon the direction of propagation along a major axis for a source located within the eddy. Propagation in one direction can produce a sensitivity for a 20-degrees change in azimuth of more than double the shift in range to the third CZ, as the opposite (180-degrees) direction yielded over a 75-degrees change in azimuth. C1 USN,CTR UNDERWATER SYST,NEWPORT,RI 02841. HARVARD UNIV,DIV APPL SCI,CAMBRIDGE,MA 02138. USN,CTR UNDERWATER SYST,NEW LONDON,CT 06320. NR 40 TC 4 Z9 7 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 MAY PY 1991 VL 89 IS 5 BP 2157 EP 2167 DI 10.1121/1.400909 PG 11 WC Acoustics; Audiology & Speech-Language Pathology SC Acoustics; Audiology & Speech-Language Pathology GA FL775 UT WOS:A1991FL77500014 ER PT J AU MILLER, RD MOYER, ET HUANG, H UBERALL, H AF MILLER, RD MOYER, ET HUANG, H UBERALL, H TI A COMPARISON BETWEEN THE BOUNDARY ELEMENT METHOD AND THE WAVE SUPERPOSITION APPROACH FOR THE ANALYSIS OF THE SCATTERED FIELDS FROM RIGID BODIES AND ELASTIC SHELLS SO JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA LA English DT Article ID HELMHOLTZ INTEGRAL-EQUATION; ACOUSTIC RADIATION; SPHERICAL-SHELLS; LAMB WAVES AB The steady state analysis of the scattering of plane acoustic waves from submerged rigid and elastic bodies using two approaches is presented. The first approach uses a combined finite element/boundary element (FE/BE) methodology. The NASA structural analysis (NASTRAN) program is used to formulate the structural matrices based on the finite element method (FEM). The surface integral equation radiation and scattering (SIERRAS) program creates the fluid matrices based on the boundary element method (BEM) and solves the coupled fluid-structure interaction problem. A superparametric boundary element (BE) with nine nodes is employed. The combined Helmoholtz integral equation formulation (CHIEF) is employed to provide a unique solution for all frequencies. In the second approach, the superposition method (SUP) is used for modeling the fluid. The SUP method is an off-boundary approach that employs a number of point sources moved inside the body to represent the fluid response at the surface. This allows the fluid matrices to be formed without surface integration. Formulations for the SUP method are introduced for both the radiation and scattering problems. The program SUPER reads the NASTRAN structural matrices and solves the combined FE/SUP fluid-structure equations. The FE/BEM and FE/SUP methods are applied to the scattering of an infinite set of plane waves from a submerged rigid sphere, rigid prolate spheroid, rigid cylinder, and from an elastic cylindrical shell with hemispherical endcaps. The SUP method is found to be easier to implement and to provide an accurate result at internal resonance frequencies where the BEM requires additional equations to ensure an accurate solution. C1 USN,CTR SURFACE WARFARE,SILVER SPRING,MD 20903. CATHOLIC UNIV AMER,DEPT PHYS,WASHINGTON,DC 20064. RP MILLER, RD (reprint author), NKF ENGN INC,4200 WILSON BLVD,SUITE 900,ARLINGTON,VA 22203, USA. NR 38 TC 43 Z9 45 U1 1 U2 10 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0001-4966 J9 J ACOUST SOC AM JI J. Acoust. Soc. Am. PD MAY PY 1991 VL 89 IS 5 BP 2185 EP 2196 DI 10.1121/1.400969 PG 12 WC Acoustics; Audiology & Speech-Language Pathology SC Acoustics; Audiology & Speech-Language Pathology GA FL775 UT WOS:A1991FL77500017 ER PT J AU AU, WWL TURL, CW AF AU, WWL TURL, CW TI MATERIAL COMPOSITION DISCRIMINATION OF CYLINDERS AT DIFFERENT ASPECT ANGLES BY AN ECHOLOCATING DOLPHIN SO JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA LA English DT Article AB An echolocating dolphin was trained to discriminate between the material composition of two cylinders oriented at different aspect angles. The two targets for the first task were a hollow aluminum and a hollow stainless steel cylinder of the same dimension. For the second task, the targets were the hollow aluminum cylinder and a cylinder of coral rock aggregates encased in degassed epoxy. The dolphin could discriminate the aluminum and steel cylinders perfectly at aspect angles of 0-degrees and 10-degrees (at 0-degrees, the longitudinal axis of a cylinder was perpendicular to the dolphin). The dolphin had its lowest performance (79% and 81% correct) when the cylinders were at aspect angles of 45-degrees and 90-degrees, respectively. The echoes from the aluminum and steel cylinders were the most similar at 45-degrees and 90-degrees the two angles at which the dolphin's performance was the lowest. The dolphin performed the second discrimination task between the hollow aluminum and coral rock cylinders almost perfectly, at all aspect angles considered. Differences in the occurrence time and amplitude of highlights along with the duration of the echoes seem to be important cues for discrimination of the cylinders. For a simple discrimination task such as the aluminum and coral rock targets, aspect independent information is available for discrimination at arbitrary aspect angles. RP AU, WWL (reprint author), USN,CTR OCEAN SYST,KAILUA,HI 96734, USA. NR 5 TC 7 Z9 8 U1 0 U2 3 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0001-4966 J9 J ACOUST SOC AM JI J. Acoust. Soc. Am. PD MAY PY 1991 VL 89 IS 5 BP 2448 EP 2451 DI 10.1121/1.400930 PG 4 WC Acoustics; Audiology & Speech-Language Pathology SC Acoustics; Audiology & Speech-Language Pathology GA FL775 UT WOS:A1991FL77500044 ER PT J AU HAFIZI, B SPRANGLE, P AF HAFIZI, B SPRANGLE, P TI DIFFRACTION EFFECTS IN DIRECTED RADIATION BEAMS SO JOURNAL OF THE OPTICAL SOCIETY OF AMERICA A-OPTICS IMAGE SCIENCE AND VISION LA English DT Article ID FOCUS WAVE MODES; HOMOGENEOUS MAXWELL EQUATIONS; TRANSVERSE ELECTRIC MODE; ELECTROMAGNETIC MISSILES; RADON-TRANSFORM; TRANSMISSION; LAUNCHER; INVERSE; ENERGY; LENS AB A number of proposed applications of electromagnetic waves require that the radiation beam maintain a high intensity over an appreciable propagation distance. These applications include, among others, power beaming, advanced radar, laser acceleration of particles, and directed-energy sources. The quest to achieve these objectives has led to a resurgence of research on diffraction theory. We present a survey and critique of the analyses and experimental tests of solutions of the wave equation in connection with so-called diffractionless and other directed radiation beams. The examples discussed include electromagnetic missiles, Bessel beams, electromagnetic directed-energy pulse trains, and electromagnetic bullets. C1 SCI APPLICAT INT CORP,MCLEAN,VA 22102. RP HAFIZI, B (reprint author), USN,RES LAB,BEAM PHYS BRANCH,WASHINGTON,DC 20375, USA. NR 47 TC 39 Z9 39 U1 2 U2 6 PU OPTICAL SOC AMER PI WASHINGTON PA 2010 MASSACHUSETTS AVE NW, WASHINGTON, DC 20036 SN 0740-3232 J9 J OPT SOC AM A JI J. Opt. Soc. Am. A-Opt. Image Sci. Vis. PD MAY PY 1991 VL 8 IS 5 BP 705 EP 717 DI 10.1364/JOSAA.8.000705 PG 13 WC Optics SC Optics GA FH989 UT WOS:A1991FH98900001 ER PT J AU OVERFELT, PL KENNEY, CS AF OVERFELT, PL KENNEY, CS TI COMPARISON OF THE PROPAGATION CHARACTERISTICS OF BESSEL, BESSEL-GAUSS, AND GAUSSIAN BEAMS DIFFRACTED BY A CIRCULAR APERTURE SO JOURNAL OF THE OPTICAL SOCIETY OF AMERICA A-OPTICS IMAGE SCIENCE AND VISION LA English DT Article AB We use the scalar Kirchhoff-Huygens diffraction integral to obtain analytic expressions for both axial and transverse intensity distributions, assuming normal incidence on a circular aperture for four types of incident field: (1) plane wave, (2) Bessel beam, (3) Gaussian beam, and (4) Bessel-Gauss beam. We use the Fresnel approximation to obtain the axial intensity as a function of distance from the aperture. We consider both Fresnel and Fraunhofer diffraction for the case of the transverse intensity distributions. For the axial case, we find that the Bessel-Gauss beam performs worse than the Bessel beam, in terms both of the magnitude of intensity and of its ability to extend a distance from the aperture. In the transverse case, we find that the Bessel-Gauss beam performance in terms of remaining nearly diffraction free over a given distance is highly dependent on the relationship among the aperture radius, the beam waist parameter, and the transverse wave number. C1 USN,CTR WEAP,RES DEPT,APPL MATH GRP,CHINA LAKE,CA 93555. RP OVERFELT, PL (reprint author), USN,CTR WEAP,RES DEPT,DIV PHYS,CHINA LAKE,CA 93555, USA. NR 19 TC 94 Z9 96 U1 2 U2 10 PU OPTICAL SOC AMER PI WASHINGTON PA 2010 MASSACHUSETTS AVE NW, WASHINGTON, DC 20036 SN 0740-3232 J9 J OPT SOC AM A JI J. Opt. Soc. Am. A-Opt. Image Sci. Vis. PD MAY PY 1991 VL 8 IS 5 BP 732 EP 745 DI 10.1364/JOSAA.8.000732 PG 14 WC Optics SC Optics GA FH989 UT WOS:A1991FH98900004 ER PT J AU DESANDRE, LF ELSON, JM AF DESANDRE, LF ELSON, JM TI EXTINCTION-THEOREM ANALYSIS OF DIFFRACTION ANOMALIES IN OVERCOATED GRATINGS SO JOURNAL OF THE OPTICAL SOCIETY OF AMERICA A-OPTICS IMAGE SCIENCE AND VISION LA English DT Article ID SURFACE-POLARITONS; SCATTERING AB A rigorous analysis based on the extinction theorem is presented to study anomalous resonant effects from singlelayer- and multilayer-overcoated, low-efficiency diffraction gratings. Anomalously high diffraction efficiency at resonance results from the coupling of the incident beam into guided waves that can be propagated within the composite structure. This analysis incorporates a recursive or R-matrix propagation algorithm that is numerically stable, and the results agree favorably with both experimental and other theoretical research. Numerical results are presented to investigate the influence of certain parameters (i.e., groove depth and shape and the number of high- and low-index overlayers) on the diffraction efficiency at resonance. In the analysis a wavelength of 0.6328-mu-m and a grating period of 0.7-mu-m were chosen so that only a -1 diffracted order and the specular beam are reflected from the gratings. Perfect transfer of the grating relief to the film boundaries does not occur in all instances; it depends on the grating and film characteristics, together with the conditions during deposition. We investigate the effect of nonreplication of the grating profile at film interfaces on anomalous diffraction. For the cases studied, it is found that nonreplication has the effect of reducing the strength of the resonant outcoupling. Incident beams with a Gaussian intensity profile are also considered. This effect is accomplished by having multiple incident beams weighted such that their superposition forms a Gaussian envelope. Numerical results show the effect of guided-wave resonances for which distortion of the reflected envelopes is seen. RP DESANDRE, LF (reprint author), USN,CTR WEAP,RES DEPT,DIV PHYS,CHINA LAKE,CA 93555, USA. NR 33 TC 38 Z9 38 U1 0 U2 0 PU OPTICAL SOC AMER PI WASHINGTON PA 2010 MASSACHUSETTS AVE NW, WASHINGTON, DC 20036 SN 0740-3232 J9 J OPT SOC AM A JI J. Opt. Soc. Am. A-Opt. Image Sci. Vis. PD MAY PY 1991 VL 8 IS 5 BP 763 EP 777 DI 10.1364/JOSAA.8.000763 PG 15 WC Optics SC Optics GA FH989 UT WOS:A1991FH98900008 ER PT J AU ACKERMAN, JR LEBOW, PS AF ACKERMAN, JR LEBOW, PS TI OBSERVATION AND COMPENSATION OF FREQUENCY DETUNING IN HIGH-REFLECTIVITY BRILLOUIN ENHANCED 4-WAVE-MIXING SO JOURNAL OF THE OPTICAL SOCIETY OF AMERICA B-OPTICAL PHYSICS LA English DT Article ID PHASE CONJUGATION; INSTABILITIES; SCATTERING; WAVES AB Details of the frequency relationships among interacting beams in Brillouin enhanced four-wave mixing (BEFWM) are examined. A new technique using two individually injection-seeded single-mode lasers allows for precise control and knowledge of the relative wavelengths of the interacting beams. This is compared with the standard frequency-shifting technique employing a single laser in conjunction with stimulated Brillouin scattering (SBS) frequency shifters. A continuously tunable frequency difference ranging over many gigahertz is achieved, resulting in a valuable tool for the investigation of nondegenerate four-wave mixing processes such as BEFWM. Two variations of BEFWM are studied: omega-pump1 - omega-pump2 = 0 with noncollinear pumps; and omega-pump1 - omega-pump2 = omega-SBS with collinear pumping. Resonance spectra of BEFWM gain versus probe-pump frequency shift show a significant detuning in the frequency for the gain maximum from the expected Brillouin shift for the former case. When the probe-pump frequency is tuned in compensation for this detuning, improvements in BEFWM phase conjugation are realized in comparison with more conventional techniques using SBS frequency shifting. C1 USN,RES LAB,WASHINGTON,DC 20375. RP ACKERMAN, JR (reprint author), SFA INC,LANDOVER,MD 20785, USA. NR 22 TC 8 Z9 8 U1 0 U2 0 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 MAY PY 1991 VL 8 IS 5 BP 1028 EP 1034 DI 10.1364/JOSAB.8.001028 PG 7 WC Optics SC Optics GA FL116 UT WOS:A1991FL11600017 ER PT J AU QADRI, SB SKELTON, EF HARFORD, MZ JONES, R LUBITZ, P AF QADRI, SB SKELTON, EF HARFORD, MZ JONES, R LUBITZ, P TI E(-)-BEAM DEPOSITION OF IN2O3 STABILIZED ZRO2 FILMS SO JOURNAL OF VACUUM SCIENCE & TECHNOLOGY A LA English DT Article ID SOLID-SOLUTIONS; SYSTEM AB Films of ZrO2-In2O3 were deposited by coevaporating ZrO2 and In2O3 using electron beam deposition techniques. During the deposition, the substrate was heated to 300-degrees-C. Postdeposition x-ray diffraction analyses showed that as-deposited films containing an In2O3 mole fraction ranging between 3.5 and 11.0 were crystalline with the zirconia in the cubic phase. RP USN, RES LAB, WASHINGTON, DC 20375 USA. NR 9 TC 11 Z9 11 U1 0 U2 0 PU A V S AMER INST PHYSICS PI MELVILLE PA STE 1 NO 1, 2 HUNTINGTON QUADRANGLE, MELVILLE, NY 11747-4502 USA SN 0734-2101 EI 1520-8559 J9 J VAC SCI TECHNOL A JI J. Vac. Sci. Technol. A PD MAY-JUN PY 1991 VL 9 IS 3 BP 510 EP 511 DI 10.1116/1.577398 PN 1 PG 2 WC Materials Science, Coatings & Films; Physics, Applied SC Materials Science; Physics GA FR761 UT WOS:A1991FR76100026 ER PT J AU QADRI, SB KIM, C KIM, KH LUBITZ, P TWIGG, M AF QADRI, SB KIM, C KIM, KH LUBITZ, P TWIGG, M TI STRUCTURAL AND MAGNETIC-PROPERTIES OF ION-BEAM SPUTTERED DEPOSITED CU/FE MULTILAYERS SO JOURNAL OF VACUUM SCIENCE & TECHNOLOGY A-VACUUM SURFACES AND FILMS LA English DT Article; Proceedings Paper CT 37TH NATIONAL SYMP OF THE AMERICAN VACUUM SOC CY OCT 08-12, 1990 CL TORONTO, CANADA SP AMER VACUUM SOC ID FILMS; SPECTROSCOPY; DEPENDENCE; MOSSBAUER; FE/CU AB Fe/Cu multilayers have been deposited using the ion assisted/ion beam sputtering technique. X-ray diffraction and selected area transmission electron diffraction show that Fe is in the body-centered-cobic phase. These results were in agreement with extended X-ray absorption fine structure measured at the Fe K edge using synchrotron radiation. Magnetic measurements using vibrating sample magnetometer and ferromagnetic resonance show nominal moment of the Fe, but moderate out of plane anisotropy. RP QADRI, SB (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 15 TC 5 Z9 5 U1 1 U2 2 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0734-2101 J9 J VAC SCI TECHNOL A JI J. Vac. Sci. Technol. A-Vac. Surf. Films PD MAY-JUN PY 1991 VL 9 IS 3 BP 430 EP 433 DI 10.1116/1.577427 PN 1 PG 4 WC Materials Science, Coatings & Films; Physics, Applied SC Materials Science; Physics GA FR761 UT WOS:A1991FR76100011 ER PT J AU QADRI, SB KIM, C TWIGG, M LUBITZ, P RUBINSTEIN, M AF QADRI, SB KIM, C TWIGG, M LUBITZ, P RUBINSTEIN, M TI ION-BEAM DEPOSITION OF AG/FE MULTILAYERS AND THEIR STRUCTURAL AND MAGNETIC-PROPERTIES SO JOURNAL OF VACUUM SCIENCE & TECHNOLOGY A-VACUUM SURFACES AND FILMS LA English DT Article; Proceedings Paper CT 37TH NATIONAL SYMP OF THE AMERICAN VACUUM SOC CY OCT 08-12, 1990 CL TORONTO, CANADA SP AMER VACUUM SOC ID FE(100) FILMS; ULTRATHIN; FE(001); AG(100); BCC AB Ag/Fe multilayers of Ag and Fe have been synthesized using ion assisted ion-beam deposition technique. Low angle peaks and well-defined satellite peaks at high angle were recorded indicating the periodic structure and the sharpness of the interface. Read photograph and selected area electron diffraction show that Fe is in bcc structure in Ag/Fe multilayers. Magnetic moment of the Ag/Fe film is comparable to bcc Fe. RP QADRI, SB (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 15 TC 5 Z9 5 U1 0 U2 0 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0734-2101 J9 J VAC SCI TECHNOL A JI J. Vac. Sci. Technol. A-Vac. Surf. Films PD MAY-JUN PY 1991 VL 9 IS 3 BP 512 EP 514 DI 10.1116/1.577399 PN 1 PG 3 WC Materials Science, Coatings & Films; Physics, Applied SC Materials Science; Physics GA FR761 UT WOS:A1991FR76100027 ER PT J AU QADRI, SB AF QADRI, SB TI X-RAY CHARACTERIZATION OF (ZN,CD)TE CDTE STRAINED LAYER SUPERLATTICES SO JOURNAL OF VACUUM SCIENCE & TECHNOLOGY A-VACUUM SURFACES AND FILMS LA English DT Article; Proceedings Paper CT 37TH NATIONAL SYMP OF THE AMERICAN VACUUM SOC CY OCT 08-12, 1990 CL TORONTO, CANADA SP AMER VACUUM SOC AB The structural properties of molecular beam epitaxially (MBE) grown (Zn,Cd)Te/CdTe superlattices on InSb substrates have been investigated using x-ray double crystal rocking curves and topographs. The value of unit cell parameters a perpendicular-to and a parallel-to have been obtained for (Zn,Cd)Te layers from the theta/2-theta-scans of (004) and (444) reflections and their relaxed parameters calculated. Rocking curve measurements show that for (004) reflection the full-width at half-maximum (FWHM) of the superlattice is significantly reduced when compared with that for ZnCdTe layer of comparable Zn composition. The narrow rocking curves for the central and the satellite peaks suggest that the interfaces are very sharp and the superlattice periods do not fluctuate. RP QADRI, SB (reprint author), USA,NAVAL RES LAB,WASHINGTON,DC 20375, USA. NR 4 TC 0 Z9 0 U1 0 U2 1 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0734-2101 J9 J VAC SCI TECHNOL A JI J. Vac. Sci. Technol. A-Vac. Surf. Films PD MAY-JUN PY 1991 VL 9 IS 3 BP 954 EP 956 DI 10.1116/1.577555 PN 1 PG 3 WC Materials Science, Coatings & Films; Physics, Applied SC Materials Science; Physics GA FR761 UT WOS:A1991FR76100114 ER PT J AU HOFFMAN, CA MEYER, JR ARNOLD, DJ BARTOLI, FJ LANSARI, Y COOK, JW SCHETZINA, JF AF HOFFMAN, CA MEYER, JR ARNOLD, DJ BARTOLI, FJ LANSARI, Y COOK, JW SCHETZINA, JF TI SHUBNIKOV-DEHAAS OSCILLATIONS AND QUANTUM HALL-EFFECT IN MODULATION-DOPED HGTE-CDTE SUPERLATTICES SO JOURNAL OF VACUUM SCIENCE & TECHNOLOGY B LA English DT Article; Proceedings Paper CT 1990 US WORKSHOP ON THE PHYSICS AND CHEMISTRY OF MERCURY CADMIUM TELLURIDE AND NOVEL INFRARED DETECTOR MATERIALS CY OCT 02-04, 1990 CL SAN FRANCISCO, CA SP COMMUNICAT ELECTRON COMMAND CTR NIGHT VIS & ELECTRO OPT, USN, OFF NAVAL TECHNOL, ASAF, OFF SCI RES, AMER VACUUM SOC ID MOLECULAR-BEAM EPITAXY; CYCLOTRON-RESONANCE; TRANSPORT; ELECTRON AB We have investigated quantum oscillations in the magneto-transport properties of HgTe-CdTe superlattices grown by molecular-beam epitaxy. Modulation doping was achieved by incorporating either indium donors or arsenic acceptors into the CdTe barriers. In a p-type sample, quantized plateaus were observed in the Hall conductivity down to i = 3 conduction channels. Since the structure contained 200 periods, this implies that the quantized holes populated only a small fraction of the total superlattice volume. A mixed conduction analysis of the nonoscillating component of magneto-transport data provided confirming evidence for the presence of a two-dimensional hole gas with the appropriate density in addition to the superlattice holes. Previous reports of the quantum Hall effect in HgTe-CdTe also yielded i far less than the total number of superlattice wells. In contrast, an n-type sample from the present study displayed a single quantum Hall plateau at i almost-equal-to 140, indicating that in this case most of the 200 superlattice periods contributed to the conduction. We argue that this represents the first observation of the quantum Hall effect associated with carriers distributed throughout the interior of a HgTe-CdTe superlattice. C1 N CAROLINA STATE UNIV,RALEIGH,NC 27695. RP HOFFMAN, CA (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 14 TC 3 Z9 3 U1 2 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 MAY-JUN PY 1991 VL 9 IS 3 BP 1813 EP 1817 DI 10.1116/1.585805 PG 5 WC Engineering, Electrical & Electronic; Nanoscience & Nanotechnology; Physics, Applied SC Engineering; Science & Technology - Other Topics; Physics GA FR866 UT WOS:A1991FR86600068 ER PT J AU MEYER, JR ARNOLD, DJ HOFFMAN, CA BARTOLI, FJ RAMMOHAN, LR AF MEYER, JR ARNOLD, DJ HOFFMAN, CA BARTOLI, FJ RAMMOHAN, LR TI THEORY FOR ELECTRON AND HOLE TRANSPORT IN HGTE-CDTE SUPERLATTICES SO JOURNAL OF VACUUM SCIENCE & TECHNOLOGY B LA English DT Article; Proceedings Paper CT 1990 US WORKSHOP ON THE PHYSICS AND CHEMISTRY OF MERCURY CADMIUM TELLURIDE AND NOVEL INFRARED DETECTOR MATERIALS CY OCT 02-04, 1990 CL SAN FRANCISCO, CA SP COMMUNICAT ELECTRON COMMAND CTR NIGHT VIS & ELECTRO OPT, USN, OFF NAVAL TECHNOL, ASAF, OFF SCI RES, AMER VACUUM SOC ID INTERFACE ROUGHNESS SCATTERING; MOLECULAR-BEAM EPITAXY; QUANTUM WELLS; PHONON-SCATTERING; LOW-TEMPERATURE; BAND-STRUCTURE; GAP; HETEROSTRUCTURES; DEPENDENCE; MOBILITY AB We present results of the first detailed theory for electron and hole transport in HgTe-CdTe superlattices. The calculation incorporates the superlattice band structure in full generality, and also treats multi-well scattering and screening processes which have been ignored in previous theories. It is predicted that whereas the electron and hole should be nearly equal at low temperatures, the hole mobility falls far below the electron value at somewhat higher temperatures due to the extreme nonparabolicity of the valence band. This prediction is entirely consistent with experimental results reported previously. Excellent quantitative agreement with the data over a broad temperature range is achieved if interface roughness scattering is considered in addition to ionized impurity scattering, acoustic and optical phonon scattering, and electron-hole scattering. It is pointed out that low-temperature electron mobilities for a number of thin-well HgTe-CdTe superlattices follow the d(w)6 dependence expected for the interface roughness mechanism. C1 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 NR 23 TC 8 Z9 8 U1 1 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 MAY-JUN PY 1991 VL 9 IS 3 BP 1818 EP 1822 DI 10.1116/1.585806 PG 5 WC Engineering, Electrical & Electronic; Nanoscience & Nanotechnology; Physics, Applied SC Engineering; Science & Technology - Other Topics; Physics GA FR866 UT WOS:A1991FR86600069 ER PT J AU FREEMAN, SB HAMAKER, RC SINGER, MI PUGH, N GARRETT, P ROSS, D AF FREEMAN, SB HAMAKER, RC SINGER, MI PUGH, N GARRETT, P ROSS, D TI INTRAOPERATIVE RADIOTHERAPY OF SKULL BASE CANCER SO LARYNGOSCOPE LA English DT Article ID RADIATION-THERAPY; NECK-CANCER; ANESTHESIA; HEAD AB As the head and neck surgeon expands the boundaries of resectability into the skull base, the margin of tumor clearance diminishes. Intraoperative radiotherapy (IORT) can be used as an adjunct to skull base surgery and external beam radiation to enhance local control in areas with close margins or remaining microscopic disease. During the period from May 1982 to May 1988, 25 patients underwent IORT of the skull base following resection and prior to closure to treat microscopic disease in 9 patients, sterilize close margins in 14 patients, and attempt to eliminate remaining gross disease in 2 patients. The types of tumors treated were 13 squamous cell carcinomas, 4 adenoid cystic carcinomas, 3 high-grade mucoepidermoid carcinomas, 3 sarcomas, 1 malignant mixed tumor, and an oncocytic adenocarcinoma. The majority of the tumors either originated in the sinuses or were skull base extensions of oral cavity or oropharyngeal cancers. In 22 patients with 1-year follow-up, IORT prevented local recurrence in 14 (64%) patients. This may represent improved control of local disease in patients who historically have a very dismal prognosis. The indications, techniques, and complications of this exciting therapeutic modality are also reviewed. patients who historically have a very dismal prognosis. C1 USN,HOSP DEPT OTOLARYNGOL HEAD & NECK SURG,PORTSMOUTH,VA 23708. UNIFORMED SERV UNIV HLTH SCI,F EDWARD HERBERT SCH MED,DEPT SURG,BETHESDA,MD 20814. METHODIST HOSP,DEPT RADIAT ONCOL,INDIANAPOLIS,IN. NR 11 TC 18 Z9 18 U1 0 U2 0 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 MAY PY 1991 VL 101 IS 5 BP 507 EP 509 PG 3 WC Medicine, Research & Experimental; Otorhinolaryngology SC Research & Experimental Medicine; Otorhinolaryngology GA FM013 UT WOS:A1991FM01300011 PM 1851521 ER PT J AU GRAHAM, C BOSWORTH, M AF GRAHAM, C BOSWORTH, M TI DESIGNING THE FUTURE UNITED-STATES NAVAL SURFACE FLEET FOR EFFECTIVENESS AND PRODUCIBILITY SO MARINE TECHNOLOGY AND SNAME NEWS LA English DT Article AB David Taylor Research Center is just commencing investigations into a new manner of defining future fleet architectures. The cost of current performance-driven ship designs has increased at a rapid rate. While it is true that a warship designed with insufficient performance is of meager utility, it is also true that the best performing warship design is of no utility if never built. Both performance and affordability are required if sufficient numbers of ships are to be built to counter the threat. By designing a future fleet architecture with producibility as a major requirement from the start, we hope to impact the acquisition cost significantly. One battle force concept titled "Distribute, Disperse, Disguise and Sustain" suggests two fundamental surface ship types; the Carrier of Large Objects (CLO) and the Scout Fighter. A CLO feasibility design in progress, Carrier Dock Multimission, is outlined to inform shipbuilding researchers of an initiative that promises to have significant impact on naval ship procurement and provide increased visibility within the U.S. Navy on producibility issues. Before an attempt is made to conceptualize a future U.S. naval surface fleet, to help create a vision of the U.S. Navy for the year 2030 and beyond, the shortcomings of the current surface Navy must be addressed first. An honest assessment of where we are now is a must for us to determine where we need to be in the future and how to get there. RP GRAHAM, C (reprint author), USN,DAVID TAYLOR RES CTR,CARDEROCK,MD, USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU SOC NAVAL ARCH MARINE ENG PI JERSEY CITY PA 601 PAVONIA AVENUE, JERSEY CITY, NJ 07306 SN 0025-3316 J9 MAR TECHNOL SNAME N JI Mar. Technol. Sname News PD MAY PY 1991 VL 28 IS 3 BP 142 EP 152 PG 11 WC Engineering, Ocean; Oceanography SC Engineering; Oceanography GA FM210 UT WOS:A1991FM21000010 ER PT J AU PARKS, AR THOMAS, ED AF PARKS, AR THOMAS, ED TI PHYSICAL SCALE MODELING VERIFICATION WITH SHIPBOARD TRIALS SO MATERIALS PERFORMANCE LA English DT Article AB The U.S. Navy has investigated and implemented design improvements for shipboard impressed current cathodic protection systems. Laboratory scale model testing was used to achieve an improved, two-zone system design. The redesigned system was installed aboard a test ship and data were gathered during sea trials to assess performance. Data acquired shipboard were correlated to laboratory work to assess the accuracy of the scale model design technique. RP PARKS, AR (reprint author), USA,NAVAL SEA SYST COMMAND,WASHINGTON,DC 20362, USA. NR 0 TC 7 Z9 11 U1 0 U2 0 PU NATL ASSN CORROSION ENG PI HOUSTON PA 1440 SOUTH CREEK DRIVE, HOUSTON, TX 77084-4906 SN 0094-1492 J9 MATER PERFORMANCE JI Mater. Perform. PD MAY PY 1991 VL 30 IS 5 BP 26 EP 29 PG 4 WC Materials Science, Characterization & Testing SC Materials Science GA FM304 UT WOS:A1991FM30400010 ER PT J AU COVINO, J KLEMM, K DYKEMA, J AF COVINO, J KLEMM, K DYKEMA, J TI COATINGS FOR HYPERSONIC APPLICATIONS SO MATERIALS PERFORMANCE LA English DT Article AB Protective coatings for titanium-aluminum alloys and carbon-carbon composites have been synthesized and characterized for hypersonic vehicle applications. Coatings of choice must show protection against oxygen and hydrogen under mild environments of low flows and temperatures and under severe environments of high flows and temperatures. Aluminum-silicate glass ceramics were chosen as coating candidates because they are materials that are stable to temperatures of 1500-degrees-C, are nonreactive to oxygen, and have minimal reactivity with respect to hot hydrogen. This article describes the chemistry of the coating synthesis and application as well as the characterization of such coatings. RP COVINO, J (reprint author), USN,CTR WEAP,RES DEPT,CHINA LAKE,CA 93555, USA. NR 0 TC 2 Z9 2 U1 0 U2 1 PU NATL ASSN CORROSION ENG PI HOUSTON PA 1440 SOUTH CREEK DRIVE, HOUSTON, TX 77084-4906 SN 0094-1492 J9 MATER PERFORMANCE JI Mater. Perform. PD MAY PY 1991 VL 30 IS 5 BP 75 EP 79 PG 5 WC Materials Science, Characterization & Testing SC Materials Science GA FM304 UT WOS:A1991FM30400025 ER PT J AU GOLDMAN, G WELBOURN, R VALERI, CR SHEPRO, D HECHTMAN, HB AF GOLDMAN, G WELBOURN, R VALERI, CR SHEPRO, D HECHTMAN, HB TI THROMBOXANE-A2 INDUCES LEUKOTRIENE-B4 SYNTHESIS THAT IN TURN MEDIATES NEUTROPHIL DIAPEDESIS VIA CD-18 ACTIVATION SO MICROVASCULAR RESEARCH LA English DT Article ID ENDOTHELIAL-CELLS; LIMB ISCHEMIA; ADHERENCE; INTERLEUKIN-1; DEPENDENCE; LFA-1 C1 HARVARD UNIV,BRIGHAM & WOMENS HOSP,SCH MED,DEPT SURG,75 FRANCIS ST,BOSTON,MA 02115. BOSTON UNIV,USN,BLOOD RES LAB,BOSTON,MA 02115. BOSTON UNIV,CTR BIOL SCI,BOSTON,MA 02115. FU NHLBI NIH HHS [HL 16714-13]; NIGMS NIH HHS [GM 35141-03, GM 24891-11] NR 22 TC 21 Z9 21 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 0026-2862 J9 MICROVASC RES JI Microvasc. Res. PD MAY PY 1991 VL 41 IS 3 BP 367 EP 375 DI 10.1016/0026-2862(91)90035-A PG 9 WC Peripheral Vascular Disease SC Cardiovascular System & Cardiology GA FK985 UT WOS:A1991FK98500008 PM 1677155 ER PT J AU SOLIS, S AF SOLIS, S TI PSYCHOSOCIAL STRESS IN MARINE CORPS OFFICERS SO MILITARY MEDICINE LA English DT Article AB Stress research in military populations has largely been devoted to specialized situations "at risk" for high levels of stress, such as combat, recruit training, sea duty, as well as post-traumatic stress in veterans. Though the armed forces continue to train for war during peacetime, military personnel also carry out administrative, executive, and technical job functions not directly related to combat preparations. Little data exists researching stress experienced in military non-combat environments. A study was conducted assessing levels of stress of 900 Marine Corps officers assigned to various headquarters and stations. Randomly selected participants completed the Derogatis Stress Profile (DSP). The study examined stress as a function of rank and the individual officer's perception of stress. Total stress levels of the subjects were compared to those used to norm the DSP. RP SOLIS, S (reprint author), USN,CTR ALCOHOL REHABIL,NORFOLK,VA 23511, USA. NR 0 TC 2 Z9 2 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 MAY PY 1991 VL 156 IS 5 BP 223 EP 227 PG 5 WC Medicine, General & Internal SC General & Internal Medicine GA FL572 UT WOS:A1991FL57200004 PM 2057072 ER PT J AU SHOENFELD, P RUPP, J SAVAGE, RW AF SHOENFELD, P RUPP, J SAVAGE, RW TI ATRIAL-FIBRILLATION AND ELECTRICAL APPLIANCE INJURY SO MILITARY MEDICINE LA English DT Article AB Electrocardiographic changes and cardiac arrhythmias have been reported frequently in patients suffering high tension (greater than 1,000 V) electrical injuries as well as low tension (less than 350 V) electrical injuries. An association of atrial fibrillation with low tension electrical injury from a household appliance, however, has not been described in the recent literature. We describe a patient with atrial fibrillation induced by a shock from a household toaster. Pathophysiologic mechanisms and approach to treatment are reviewed, emphasizing the transient nature of most electrically induced arrhythmias. RP SHOENFELD, P (reprint author), USN HOSP,PORTSMOUTH,VA 23708, USA. NR 0 TC 5 Z9 5 U1 0 U2 0 PU ASSN MILITARY SURG US PI BETHESDA PA 9320 OLD GEORGETOWN RD, BETHESDA, MD 20814 SN 0026-4075 J9 MIL MED JI Milit. Med. PD MAY PY 1991 VL 156 IS 5 BP 254 EP 255 PG 2 WC Medicine, General & Internal SC General & Internal Medicine GA FL572 UT WOS:A1991FL57200014 PM 2057080 ER PT J AU WEBSTER, WP AF WEBSTER, WP TI ARTIFICIAL NEURAL NETWORKS AND THEIR APPLICATION TO WEAPONS SO NAVAL ENGINEERS JOURNAL LA English DT Article AB Complex processing algorithms associated with requirements for real-time target detection, acquisition and recognition have far outdistanced our ability to package the necessary processing power into real-time weapon-sized hardware. Weapon developers need new, radically different, approaches to solve these difficult weapon signal processing problems. Artificial neural networks (ANN) is one of the new, radically different, signal processing approaches that is currently receiving much attention for weapon applications. The human brain is a powerful image and pattern recognition processor whose basic processing element is the neuron. Synapses are the weighted interconnections between neurons that permit learning and communication between the neurons. Artificial neural network technology attempts to mathematically and/or electrically model neurons and synapses and then interconnect these models in architectures suitable for signal processing tasks. ANN technology is particularly applicable to pattern recognition, speech recognition, machine vision, robotics, and optimization signal processing tasks. Specific military applications include missile seekers, missile fuzing, sonar target discrimination, automatic target recognition, and autopilots. Two unique characteristics of ANN processors are that they are non-linear processors and that they are trained, not programmed, to accomplish processing tasks in a manner analogous to the way the human brain learns. Learning is achieved by modifying the synaptic weights of each artificial neuron until the final desired system processing response is achieved. Several years ago the Naval Weapons Center (NavWpnCen) identified ANN technology as a high risk-high payoff approach to missile signal processing requirements and initiated several research and development efforts in this area. One result of this work is the new 80170NW ANN analog VLSI chip produced by Intel Inc. Another is the current Missileborne Integrated Neural Network Demonstration (MINND) Advanced Technology Demonstration (ATD) project to develop a hybrid analog/digital artificial neural computer for real-time processing of data from imaging missile seekers. The neural computer will use several Intel chips interconnected in a flexible architecture, which is loosely based on the operation of the human retina, to demonstrate desired target/background discrimination and target detection and tracking processing capabilities. This paper provides an introduction to artificial neural network technology and discusses some of the results that have been achieved by applying ANN technology to weapon system problems at the Naval Weapons Center. RP WEBSTER, WP (reprint author), USN,CTR WEAP,DEPT INTERCEPT WEAP,CHINA LAKE,CA 93555, USA. NR 0 TC 4 Z9 4 U1 1 U2 2 PU AMER SOC NAVAL ENG INC PI ALEXANDRIA PA 1452 DUKE STREET, ALEXANDRIA, VA 22314-3458 SN 0028-1425 J9 NAV ENG J JI Nav. Eng. J. PD MAY PY 1991 VL 103 IS 3 BP 46 EP 59 PG 14 WC Engineering, Marine; Engineering, Civil; Oceanography SC Engineering; Oceanography GA FG127 UT WOS:A1991FG12700004 ER PT J AU MCCALLUM, D ENGLE, AH PLATZER, GP KARAFIATH, G AF MCCALLUM, D ENGLE, AH PLATZER, GP KARAFIATH, G TI HYDRODYNAMIC EFFICIENCY IMPROVEMENTS FOR UNITED-STATES NAVY SHIPS SO NAVAL ENGINEERS JOURNAL LA English DT Article AB This paper reports on an investigation of the applicability of recent hull efficiency improvement concepts to U.S. Navy ships. Among the concepts investigated were stern flaps, Grim Wheels, alternate aftbody configurations, bulbous bows, and flow modifying ducts. Extensive model testing was conducted at the David Taylor Research Center (DTRC) for each concept, and care was taken to check out critical propeller cavitation and noise aspects associated with the investigation of alternate stern configurations and Grim Wheel concepts. A guiding principle in this program was to utilize the expertise available both here and abroad so that each design concept would have the greatest chance of success. As a result of these investigations, significant gains in fuel economy were obtained. Specifically, full scale trials of FFG-25 (USS Copeland), equipped with and without a stern flap, demonstrated that fuel savings of 5-9% are achieved at speeds above 12 knots. In addition, fuel savings of 9.4% for T-AGS 39 equipped with a Grim Wheel and 5.6% for the combination of a large bulbous bow and a large diameter/low RPM propeller on AE-36 have been predicted. The paper concludes with a direction for future applications to U.S. Navy, and other ships. RP MCCALLUM, D (reprint author), USN,SEA SYST COMMAND,WASHINGTON,DC 20350, USA. NR 0 TC 0 Z9 0 U1 1 U2 3 PU AMER SOC NAVAL ENG INC PI ALEXANDRIA PA 1452 DUKE STREET, ALEXANDRIA, VA 22314-3458 SN 0028-1425 J9 NAV ENG J JI Nav. Eng. J. PD MAY PY 1991 VL 103 IS 3 BP 74 EP 90 PG 17 WC Engineering, Marine; Engineering, Civil; Oceanography SC Engineering; Oceanography GA FG127 UT WOS:A1991FG12700006 ER PT J AU JUMP, ME EMBERSON, WC AF JUMP, ME EMBERSON, WC TI SHIP ELECTROMAGNETIC PULSE SURVIVABILITY TRIALS SO NAVAL ENGINEERS JOURNAL LA English DT Article AB The Navy conducted an EMP (Electromagnetic Pulse) trial on a Spruance class destroyer (USS Deyo; DD-989) during July 1990 using the Electromagnetic Pulse Radio Frequency Environment Simulator for Ships (EMPRESS II). The Navy has selected a layered hardening approach consisting of platform level hardening and system level hardening to provide EMP survivability for the mission critical systems of surface ships. One key question is how much of the hardening can be allocated to and achieved by platform hardening? The other key questions are which systems will also require system level hardening and can system level hardening be effectively achieved? Prior to the trial, a platform level EMP hardening package was installed to evaluate the effectiveness of platform hardening techniques. Electromagnetic interference (EMI) fixes were installed when the EMI fixes were determined to provide system level hardening to emissions similar in frequency content to EMP. Temporary system level EMP hardening measures were also installed on selected combat systems and extensive pretrial EMP susceptibility assessments were performed on many of the ship systems. During the trial period, USS Deyo was subjected to over 700 sub-threat level pulses at increasing power levels. The highest test level during this trial was approximately 10dB below the EMP threat level. The induced transient currents exterior and interior to the ship and on a variety of systems were measured and used to evaluated the effectiveness of the platform hardening and system hardening. During the trial, a number of combat system operability tests were also conducted to help identify potential problem areas and evaluate system performance. This paper describes some of the events prior to and during the USS Deyo trial and the lessons learned as a result of the trial. The lessens learned from this trial will have a positive impact on future ship hardening efforts and EMP trials. RP JUMP, ME (reprint author), USN,CTR SURFACE WEAP,DEPT PROTECT SYST,WHITE OAK LAB,ELECTROMAGNET PULSE BRANCH,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 MAY PY 1991 VL 103 IS 3 BP 136 EP 140 PG 5 WC Engineering, Marine; Engineering, Civil; Oceanography SC Engineering; Oceanography GA FG127 UT WOS:A1991FG12700011 ER PT J AU SMITH, PH CHUA, DL JAMES, SD AF SMITH, PH CHUA, DL JAMES, SD TI DEVELOPMENT OF A LITHIUM RECHARGEABLE BATTERY FOR UNDERWATER VEHICLE PROPULSION SO NAVAL ENGINEERS JOURNAL LA English DT Article AB The Navy is researching lithium rechargeable batteries as a possible replacement for silver oxide/zinc cells in powering the next generation of naval underwater vehicles. This paper summarizes progress made with the most promising lithium system - lithium/cobalt oxide, which has 2.5 times the theoretical energy density of silver oxide/zinc. Using small (0.03 Ah) laboratory cells, optimization was completed for cathode fabrication and electrolyte composition. Even at three times the required discharge rate, cycle life obtained with these cells was over double the program goal. Furthermore, a significant fast charge capability was demonstrated when charging was conducted at constant potential versus constant current. This laboratory cell technology was scaled up successfully to 2.5 Ah cell test fixtures. Presently, engineering development is underway at the 10 Ah level in hermetically sealed, instrumented subcells. Preliminary data are achieving the required energy densities for at least 15 cycles with tests still continuing. The optimized design resulting from the 10 Ah tests is being incorporated into 30 Ah cells. RP SMITH, PH (reprint author), USN,CTR SURFACE WEAP,R&D GRP,ELECTROCHEM BRANCH,CODE R33,SILVER SPRING,MD 20910, USA. NR 0 TC 0 Z9 0 U1 0 U2 3 PU AMER SOC NAVAL ENG INC PI ALEXANDRIA PA 1452 DUKE STREET, ALEXANDRIA, VA 22314-3458 SN 0028-1425 J9 NAV ENG J JI Nav. Eng. J. PD MAY PY 1991 VL 103 IS 3 BP 158 EP 163 PG 6 WC Engineering, Marine; Engineering, Civil; Oceanography SC Engineering; Oceanography GA FG127 UT WOS:A1991FG12700013 ER PT J AU DEGIORGI, V MATIC, P AF DEGIORGI, V MATIC, P TI A COMPUTATIONAL STUDY OF HY AND HSLA STEEL PERFORMANCE IN A BULKHEAD TEST PANEL GEOMETRY SO NAVAL ENGINEERS JOURNAL LA English DT Article AB As nonlinear computational methods become integrated into the structural design and analysis process, the effects of large deformation material response on large deflection structural response can, in principle, be predicted. The accuracy of structural predictions ultimately depends on an accurate assessment of the material responses which are encountered in the structure. This is particularly true if information on locally severe plastic deformation or fracture initiation and flaw tolerance is desired. Previously determined parameters for the elastic-plastic response of HY-80, HY-100, HSLA-80 and HSLA-100 steels, accurate through large strains terminating at the point of fracture, were applied in finite element simulations to predict the performance of a bulkhead test panel geometry. Significant differences in panel performance under hydrostatic loading conditions were predicted for the materials considered. The plastic deflections were found to be strongly influenced by the relative local or diffuse nature of intense plastic deformation across the panel. These results suggest that the comparative nonlinearity of these materials was as important as the strength and ductility in affecting performance. Further analyses, aimed at assessing flaw tolerance, were considered by conducting small scale analyses of local details where severe deformation conditions were predicted by the larger scale panel model. RP DEGIORGI, V (reprint author), USN,RES LAB,MECH MAT BRANCH,WASHINGTON,DC 20375, USA. NR 0 TC 1 Z9 1 U1 0 U2 1 PU AMER SOC NAVAL ENG INC PI ALEXANDRIA PA 1452 DUKE STREET, ALEXANDRIA, VA 22314-3458 SN 0028-1425 J9 NAV ENG J JI Nav. Eng. J. PD MAY PY 1991 VL 103 IS 3 BP 164 EP 174 PG 11 WC Engineering, Marine; Engineering, Civil; Oceanography SC Engineering; Oceanography GA FG127 UT WOS:A1991FG12700014 ER PT J AU YOUNG, MB AF YOUNG, MB TI CONCEPT FOR A FORCE LEVEL COMBAT SYSTEM SO NAVAL ENGINEERS JOURNAL LA English DT Article AB The concept of a superset is not unknown to the Navy. The term "superset" has been applied to the combat systems onboard the Aegis cruisers (CG-65 through CG-73) and the Aegis destroyers (DDG-51 through DDG-64). David Taylor Research Center (DTRC) has developed several concepts for ship designs which can be considered supersets. The goal of this paper is to develop the concept of a combat system superset, a derivative of which would be deployed on all surface combatants. This combat system superset will contain all warfare area missions and supporting functional elements. The combat system superset should be related to future ship designs to create an integrated surface combatant. The ultimate utility of a combat system superset design would be lower life cycle costs for its derivatives. A notional combat system superset is presented along with three proposed derivatives. The paper concludes with the application of the superset for each derivative and a discussion of the resulting combat systems. RP YOUNG, MB (reprint author), USN,CTR SURFACE WARFARE,DIV AEGIS SHIP COMBAT SYST,SYST ENGN BRANCH,WASHINGTON,DC 20350, USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER SOC NAVAL ENG INC PI ALEXANDRIA PA 1452 DUKE STREET, ALEXANDRIA, VA 22314-3458 SN 0028-1425 J9 NAV ENG J JI Nav. Eng. J. PD MAY PY 1991 VL 103 IS 3 BP 240 EP 252 PG 13 WC Engineering, Marine; Engineering, Civil; Oceanography SC Engineering; Oceanography GA FG127 UT WOS:A1991FG12700021 ER PT J AU CIERI, AM ELFONT, MM AF CIERI, AM ELFONT, MM TI ENGINEERED APPROACH TO EFFECTIVE MAINTENANCE MANAGEMENT SO NAVAL ENGINEERS JOURNAL LA English DT Article AB The Assessment of Equipment Condition (AEC) Program at the Naval Ship Systems Engineering Station has been providing shore based support to assess the condition of shipboard equipment. This paper examines some of the limitations of the existing process. The paper offers an engineered approach to provide condition assessment on board ship and the shore side support necessary to maximize the effectiveness of the total ship maintenance process. The recommended approach uses existing technology and current hardware and software applications. Included in the approach is the use of microcomputer machinery work stations with expert system software, and a central Condition Maintenance Information System with the capability to provide work packages based on condition assessment and to trend the effectiveness of maintenance decisions. The paper identifies a phased implementation with a limited pilot program prior to fleet wide involvement. RP CIERI, AM (reprint author), USN,NAVAL SHIP SYST ENGN STN,DEPT EQUIPMENT ASSESSMENT & ALTERNAT,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 MAY PY 1991 VL 103 IS 3 BP 253 EP 261 PG 9 WC Engineering, Marine; Engineering, Civil; Oceanography SC Engineering; Oceanography GA FG127 UT WOS:A1991FG12700022 ER PT J AU GEORGE, E AF GEORGE, E TI NEW TECHNIQUES IN WEAPON FIRING CUTOUT ZONE DESIGN SO NAVAL ENGINEERS JOURNAL LA English DT Article AB Weapon pointing and firing zones are critical operational parameters which directly affect the safety and capability of weapon performance and ship mission. These zones are normally implemented in the weapon system and restrict areas of weapon movement and function allowing clearance for ship structure during weapon performance. The primary purpose of the zones is to ensure topside safety by preventing the weapon from firing into surrounding ship structure. Weapon pointing and firing zones are also used to integrate weapon and other shipboard equipment functions to avoid interference conflicts. The Naval Surface Warfare Center (NAVSWC) is the technical direction agent which designs weapon pointing and firing zones for every large caliber gun mount and rotating missile launcher on U.S. Navy ships. Because of the increasing complexity of topside operations and applications in computer technology, new methods are being developed to support NAVSWC weapon zone design efforts. This paper first summarizes present techniques in NAVSWC weapon zone analysis and design. The second part of the paper describes methods under development using graphic computer systems to conduct safety analyses for weapon zone design. The paper concludes with a review of future weapon cutout system improvements. RP GEORGE, E (reprint author), USN,NAVAL SURFACE WARFARE CTR,POINTING & FIRING CUTOUT ZONE PROGRAM,WASHINGTON,DC 20350, USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER SOC NAVAL ENG INC PI ALEXANDRIA PA 1452 DUKE STREET, ALEXANDRIA, VA 22314-3458 SN 0028-1425 J9 NAV ENG J JI Nav. Eng. J. PD MAY PY 1991 VL 103 IS 3 BP 278 EP 290 PG 13 WC Engineering, Marine; Engineering, Civil; Oceanography SC Engineering; Oceanography GA FG127 UT WOS:A1991FG12700025 ER PT J AU HARIHAR, P STAPOR, WJ CAMPBELL, AB KNUDSON, AR AF HARIHAR, P STAPOR, WJ CAMPBELL, AB KNUDSON, AR TI RISE TIME SPECTROSCOPY OF PROTONS AND ALPHAS IN A STILBENE SCINTILLATOR SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article ID NUCLEAR RADIATIONS AB Pulse shape analysis is used to investigate the energy dependence of proton and alpha rise times in a stilbene scintillation detector. C1 USN,RES LAB,WASHINGTON,DC 20375. RP HARIHAR, P (reprint author), UNIV LOWELL,DEPT PHYS & APPL PHYS,LOWELL,MA 01854, USA. NR 6 TC 10 Z9 10 U1 0 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-9002 J9 NUCL INSTRUM METH A JI Nucl. Instrum. Methods Phys. Res. Sect. A-Accel. Spectrom. Dect. Assoc. Equip. PD MAY 1 PY 1991 VL 302 IS 3 BP 469 EP 471 DI 10.1016/0168-9002(91)90361-S PG 3 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA FT406 UT WOS:A1991FT40600010 ER PT J AU PRICE, JL STERN, SH SIMONS, DG LAND, DJ BRENNAN, JG AF PRICE, JL STERN, SH SIMONS, DG LAND, DJ BRENNAN, JG TI STOPPING POWERS FOR 400 TO 2400 KEV N IONS IN HE AND AR SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS LA English DT Article; Proceedings Paper CT 11TH INTERNATIONAL CONF ON THE APPLICATION OF ACCELERATORS IN RESEARCH AND INDUSTRY CY NOV 05-08, 1990 CL DENTON, TX ID RANGE; Z2 AB Stopping powers for 400 to 2400 keV N ions in He and Ar gas targets were measured using a time-of-flight technique. The stopping power was directly determined from changes in ion time-of-flight over a fixed distance after passing through a differentially-pumped, windowless gas cell. Start and stop pulses, derived from secondary electrons produced by passing the ion through thin C foils and detected by microchannel plates, are used to trigger a TAC spectrometer. The measured stopping power values are analyzed as a function of their linearity with projectile velocity and are compared to values compiled by Ziegler et al. and to the predictions of the Firsov-Land-Brennan (FLB) theory. In general, the measured values agree with FLB but are consistently lower than those of Ziegler et al. Comparison of results obtained with N-14 and N-15 and with N+ and N2+ projectiles are presented. Details of the measurement and detection systems are also given. C1 CATHOLIC UNIV AMER,WASHINGTON,DC 20064. RP PRICE, JL (reprint author), USN,CTR SURFACE WARFARE,WHITE OAK LAB,10901 NEW HAMPSHIRE AVE,SILVER SPRING,MD 20903, USA. NR 9 TC 3 Z9 3 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-583X J9 NUCL INSTRUM METH B JI Nucl. Instrum. Methods Phys. Res. Sect. B-Beam Interact. Mater. Atoms PD MAY PY 1991 VL 56-7 BP 348 EP 351 DI 10.1016/0168-583X(91)96044-L PN 1 PG 4 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Atomic, Molecular & Chemical; Physics, Nuclear SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA FQ888 UT WOS:A1991FQ88800093 ER PT J AU MCCORD, M CRANNELL, H FAGG, LW OBRIEN, JT SOBER, DI LIGHTBODY, JW MARUYAMA, XK TREADO, PA AF MCCORD, M CRANNELL, H FAGG, LW OBRIEN, JT SOBER, DI LIGHTBODY, JW MARUYAMA, XK TREADO, PA TI PRELIMINARY-RESULTS OF A NEW DETERMINATION OF THE RMS CHARGE RADIUS OF THE PROTON SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS LA English DT Article; Proceedings Paper CT 11TH INTERNATIONAL CONF ON THE APPLICATION OF ACCELERATORS IN RESEARCH AND INDUSTRY CY NOV 05-08, 1990 CL DENTON, TX ID FORM-FACTORS AB New absolute and relative cross sections for elastic scattering of electrons from the proton have been measured using the linac facilities at NIST. The data were obtained using a high-pressure, flowing-gas target cell alternately filled with H-2 and CH4 gas. The measurements span a momentum transfer range from 0.22 to 0.73 fm-1. These new results have been combined with an extensive set of existing elastic electron scattering data in a Fourier-Bessel analysis to obtain the charge density parameters and the rms radius of the proton. Some selection among the available data was necessary because of inconsistencies between published data sets. We obtain an rms radius of 0.865 +/- 0.020 fm. C1 CATHOLIC UNIV AMER,WASHINGTON,DC 20064. USN,POSTGRAD SCH,MONTEREY,CA 93943. GEORGETOWN UNIV,WASHINGTON,DC 20057. NR 20 TC 5 Z9 5 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-583X J9 NUCL INSTRUM METH B JI Nucl. Instrum. Methods Phys. Res. Sect. B-Beam Interact. Mater. Atoms PD MAY PY 1991 VL 56-7 BP 496 EP 499 DI 10.1016/0168-583X(91)96079-Z PN 1 PG 4 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Atomic, Molecular & Chemical; Physics, Nuclear SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA FQ888 UT WOS:A1991FQ88800128 ER PT J AU MCCAFFERTY, E NATISHAN, PM HUBLER, GK AF MCCAFFERTY, E NATISHAN, PM HUBLER, GK TI ION-BEAM PROCESSING OF METAL-SURFACES FOR IMPROVED CORROSION-RESISTANCE SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS LA English DT Article; Proceedings Paper CT 11TH INTERNATIONAL CONF ON THE APPLICATION OF ACCELERATORS IN RESEARCH AND INDUSTRY CY NOV 05-08, 1990 CL DENTON, TX ID ALUMINUM; ALLOYS; FILMS AB Ion beam techniques such as ion implantation, ion beam mixing, and ion beam assisted deposition allow modification of metal surfaces for improved corrosion resistance. The corrosion process can be altered by modifying either the anodic or cathodic process, by modifying the passive film, or by using corrosion resistant coatings. Examples are given of each approach. These are, in turn, implantation of various ions into aluminum to improve the resistance to pitting, ion implantation or ion beam mixing of palladium into titanium to increase the corrosion resistance in acids, implantation to form amorphous surface alloys, and the use of ion beam deposition to form protective films of tantalum oxide or silicon nitride on aluminum. RP MCCAFFERTY, E (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 11 TC 36 Z9 37 U1 0 U2 2 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-583X J9 NUCL INSTRUM METH B JI Nucl. Instrum. Methods Phys. Res. Sect. B-Beam Interact. Mater. Atoms PD MAY PY 1991 VL 56-7 BP 639 EP 643 DI 10.1016/0168-583X(91)96114-Z PN 1 PG 5 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Atomic, Molecular & Chemical; Physics, Nuclear SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA FQ888 UT WOS:A1991FQ88800163 ER PT J AU MACLAREN, SA CORRELL, FD HUDDLE, JR VANHOY, J KULP, WD AF MACLAREN, SA CORRELL, FD HUDDLE, JR VANHOY, J KULP, WD TI A SIMPLE EXTERNAL-BEAM ION MILLIPROBE SYSTEM FOR IN-AIR PIXE SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS LA English DT Article; Proceedings Paper CT 11TH INTERNATIONAL CONF ON THE APPLICATION OF ACCELERATORS IN RESEARCH AND INDUSTRY CY NOV 05-08, 1990 CL DENTON, TX ID ELECTROSTATIC LENS; MICROPROBE AB A simple external-beam ion milliprobe system was designed and constructed as part of an undergraduate honors research project. The system includes an adjustable object slit, a compact electrostatic quadrupole triplet lens, a lens positioner, and a shielded tip with a thin Kapton window through which the beam exits the accelerator vacuum and enters a sample enclosure with interlocked doors. Auxiliary equipment includes a four-segment lens-entrance collimator with a beam-current monitor that facilitates steering the beam and an interlock system that intercepts the beam when any of the doors to the sample enclosure are opened. Details of the design and construction of the system will be presented and its performance will be described. RP MACLAREN, SA (reprint author), USN ACAD,DEPT PHYS,ANNAPOLIS,MD 21402, USA. NR 11 TC 4 Z9 4 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-583X J9 NUCL INSTRUM METH B JI Nucl. Instrum. Methods Phys. Res. Sect. B-Beam Interact. Mater. Atoms PD MAY PY 1991 VL 56-7 BP 708 EP 711 DI 10.1016/0168-583X(91)95009-3 PN 2 PG 4 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Atomic, Molecular & Chemical; Physics, Nuclear SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA FQ890 UT WOS:A1991FQ89000009 ER PT J AU MARSHALL, PW DALE, CJ BURKE, EA AF MARSHALL, PW DALE, CJ BURKE, EA TI PROTON-INDUCED DISPLACEMENT DAMAGE FLUCTUATIONS IN SILICON MICROVOLUMES SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS LA English DT Article; Proceedings Paper CT 11TH INTERNATIONAL CONF ON THE APPLICATION OF ACCELERATORS IN RESEARCH AND INDUSTRY CY NOV 05-08, 1990 CL DENTON, TX AB Calculations of the first and second moments of damage energy distributions from elastic collisions and from nuclear reactions, at proton energies ranging from 10 to 300 MeV, are incorporated into a model describing the probability of damage as a function of the proton fluence and the sensitive volume in Si. Comparisons between the predicted and measured leakage currents in Si imaging arrays illustrate how the Poisson distribution of higher energy nuclear reaction recoils affects the pixel-to-pixel variance in the damage across the array. C1 SACHS FREEMAN ASSOCIATES INC,LANDOVER,MD 20785. SPIRE CORP,BEDFORD,MA 01730. RP MARSHALL, PW (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 9 TC 3 Z9 3 U1 0 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-583X J9 NUCL INSTRUM METH B JI Nucl. Instrum. Methods Phys. Res. Sect. B-Beam Interact. Mater. Atoms PD MAY PY 1991 VL 56-7 BP 847 EP 850 DI 10.1016/0168-583X(91)95044-E PN 2 PG 4 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Atomic, Molecular & Chemical; Physics, Nuclear SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA FQ890 UT WOS:A1991FQ89000044 ER PT J AU PRICE, JL LAND, DJ STERN, SH GUARDALA, NA CADY, PK SIMONS, DG BROWN, MD BRENNAN, JG STUMBORG, MF AF PRICE, JL LAND, DJ STERN, SH GUARDALA, NA CADY, PK SIMONS, DG BROWN, MD BRENNAN, JG STUMBORG, MF TI AN OVERVIEW OF THE ION-BEAM ANALYSIS LABORATORY AT WHITE-OAK SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS LA English DT Article; Proceedings Paper CT 11TH INTERNATIONAL CONF ON THE APPLICATION OF ACCELERATORS IN RESEARCH AND INDUSTRY CY NOV 05-08, 1990 CL DENTON, TX AB The Naval Surface Warfare Center (NSWC) at White Oak is completing a major upgrading of its positive-ion accelerator facilities dedicated to the study of ion-atom collisions and ion-beam analysis of materials. At the heart of the facility is a new National Electrostatics Corporation 3 MV tandem accelerator which replaced a 2.5 MV Van de Graaff. There are two ion sources available which will enable the accelerator to produce an ion from nearly any element in the periodic table. Mass-energy control is defined by a 90-degrees analyzing magnet. A downstream switching magnet allows for the establishment of five separate beam lines. Currently three beam lines are in operation: an RBS and PIXE analysis system, an NRA analysis system, and an experimental line for measuring the stopping powers of ions in gases. In addition to numerous PCs for data manipulation, a VAX computer system is being upgraded to perform computer-controlled acquisition and analysis of spectral data. Details on the upgrade will be presented as well as recent results of ion-beam analysis. RP PRICE, JL (reprint author), USN,CTR SURFACE WARFARE,WHITE OAK LAB,SILVER SPRING,MD 20903, USA. NR 9 TC 14 Z9 14 U1 0 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-583X J9 NUCL INSTRUM METH B JI Nucl. Instrum. Methods Phys. Res. Sect. B-Beam Interact. Mater. Atoms PD MAY PY 1991 VL 56-7 BP 1014 EP 1016 DI 10.1016/0168-583X(91)95084-Q PN 2 PG 3 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Atomic, Molecular & Chemical; Physics, Nuclear SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA FQ890 UT WOS:A1991FQ89000084 ER PT J AU HUDDLE, JR VANHOY, JR CORRELL, FD AF HUDDLE, JR VANHOY, JR CORRELL, FD TI A WARNING-SIGN AND SAFETY-INTERLOCK SYSTEM FOR AN NEC 5SDH ACCELERATOR SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS LA English DT Article; Proceedings Paper CT 11TH INTERNATIONAL CONF ON THE APPLICATION OF ACCELERATORS IN RESEARCH AND INDUSTRY CY NOV 05-08, 1990 CL DENTON, TX AB In this paper, we describe a system we have designed and assembled which is intended to protect users of a small tandem accelerator from serious exposure to ionizing radiation. This goal is complicated by the fact that our accelerator, target area, control console and data acquisition area are all contained in a single room. In our system, commercially available gamma and neutron monitors, illuminated warning signs and magnetic door switches are combined with a custom-built interlock chassis and a simple modification to the accelerator's chain motor power contactor. A key switch prevents unauthorized persons from energizing the chain. Warning signs above the entrances to the accelerator lab indicate one of three operating conditions: accelerator off, chain power on, and radiation warning (radiation levels above 0.1 mR/h). If radiation levels in the lab exceed 2 mR/h, power to the chain motor is cut off. Chain power is also cut off when one of the lab doors is opened, unless the operator deliberately and temporarily overrides the system to permit entrance or exit. RP HUDDLE, JR (reprint author), USN ACAD,DEPT PHYS,ANNAPOLIS,MD 21402, USA. NR 2 TC 3 Z9 3 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-583X J9 NUCL INSTRUM METH B JI Nucl. Instrum. Methods Phys. Res. Sect. B-Beam Interact. Mater. Atoms PD MAY PY 1991 VL 56-7 BP 1173 EP 1175 DI 10.1016/0168-583X(91)95124-V PN 2 PG 3 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Atomic, Molecular & Chemical; Physics, Nuclear SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA FQ890 UT WOS:A1991FQ89000124 ER PT J AU CORRELL, FD HUDDLE, JR VANHOY, J AF CORRELL, FD HUDDLE, JR VANHOY, J TI UNDERGRADUATE RESEARCH AND TEACHING WITH A SMALL TANDEM ACCELERATOR SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS LA English DT Article; Proceedings Paper CT 11TH INTERNATIONAL CONF ON THE APPLICATION OF ACCELERATORS IN RESEARCH AND INDUSTRY CY NOV 05-08, 1990 CL DENTON, TX ID PROTON; ARCHAEOLOGY; SCATTERING AB The U.S. Naval Academy is developing an accelerator laboratory to support undergraduate research and teaching. The laboratory includes a 1.7-MV tandem electrostatic accelerator, an rf charge-exchange negative ion source, and a beamline containing a scattering chamber and an external-beam ion milliprobe. The milliprobe was built as part of one senior honors project, and is being used in another to study archeological samples by in-air PIXE. The laboratory has been used in a senior-level nuclear physics course to demonstrate resonant scattering of protons from C-12 and in a junior-level atomic physics course to demonstrate Moseley's law and the principles of PIXE analysis. This paper describes the laboratory and its applications during the first year of operation. RP CORRELL, FD (reprint author), USN ACAD,DEPT PHYS,ANNAPOLIS,MD 21402, USA. NR 37 TC 2 Z9 2 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-583X J9 NUCL INSTRUM METH B JI Nucl. Instrum. Methods Phys. Res. Sect. B-Beam Interact. Mater. Atoms PD MAY PY 1991 VL 56-7 BP 1180 EP 1184 DI 10.1016/0168-583X(91)95126-X PN 2 PG 5 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Atomic, Molecular & Chemical; Physics, Nuclear SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA FQ890 UT WOS:A1991FQ89000126 ER PT J AU MURRAY, KM STAPOR, WJ CASTENADA, C AF MURRAY, KM STAPOR, WJ CASTENADA, C TI A PROTON-BEAM FACILITY FOR SINGLE EVENT RESEARCH SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS LA English DT Article; Proceedings Paper CT 11TH INTERNATIONAL CONF ON THE APPLICATION OF ACCELERATORS IN RESEARCH AND INDUSTRY CY NOV 05-08, 1990 CL DENTON, TX AB We describe a charged particle (Z = 1 or 2) radiation system developed jointly by KM Sciences, The Naval Research Laboratory, and The Crocker Nuclear Laboratory. The system is used primarily to simulate the space environmental protons and other charged particles with energies from 10 to 70 MeV. These particles in turn produce single events in devices being tested. The system provides a highly reproducible beam combined with precise dosimetric measurement and control to better than 2% for fluences from 1 x 10(8) to 1 x 10(12) particles/cm2. The system can also provide chopped single pulses with durations from 0.1 to 10 s at intensities up to 3 x 10(13) particles/cm2 s. C1 USN,RES LAB,WASHINGTON,DC 20375. UNIV CALIF DAVIS,CROCKER NUCL LAB,DAVIS,CA 95616. RP MURRAY, KM (reprint author), KM SCI,6200 MEADOW WOOD,SUITE 22,RENO,NV 89502, USA. NR 6 TC 4 Z9 4 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-583X J9 NUCL INSTRUM METH B JI Nucl. Instrum. Methods Phys. Res. Sect. B-Beam Interact. Mater. Atoms PD MAY PY 1991 VL 56-7 BP 1256 EP 1259 DI 10.1016/0168-583X(91)95145-4 PN 2 PG 4 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Atomic, Molecular & Chemical; Physics, Nuclear SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA FQ890 UT WOS:A1991FQ89000145 ER PT J AU THOMAS, LC WASHBURN, AR AF THOMAS, LC WASHBURN, AR TI DYNAMIC SEARCH GAMES SO OPERATIONS RESEARCH LA English DT Article DE GAMES GROUP DECISIONS; GAMBLING; ACTIVE SONAR SEARCH; MILITARY; ANTISUBMARINE WARFARE; ACTIVE SONAR SEARCH; SEARCH AND SURVEILLANCE; ACTIVE SONAR SEARCH AB In these games the searcher has a sequence of looks in which to detect the target, while the target chooses a new cell after each look in the knowledge of what cells have been searched so far. Since time is of the essence and the searcher's speed is bounded, the target has a tendency to choose cells far away from the most recent look. A theory for such games is developed and used to approximate a game involving a dipping sonar. C1 USN,POSTGRAD SCH,MONTEREY,CA 93940. RP THOMAS, LC (reprint author), UNIV EDINBURGH,EDINBURGH EH8 9YL,MIDLOTHIAN,SCOTLAND. RI Thomas, Lyn/B-3326-2014 OI Thomas, Lyn/0000-0002-3727-4772 NR 9 TC 15 Z9 15 U1 0 U2 0 PU OPERATIONS RES SOC AMER PI BALTIMORE PA 1314 GUILFORD AVENUE BUSINESS OFFICE, BALTIMORE, MD 21202 SN 0030-364X J9 OPER RES JI Oper. Res. PD MAY-JUN PY 1991 VL 39 IS 3 BP 415 EP 422 DI 10.1287/opre.39.3.415 PG 8 WC Management; Operations Research & Management Science SC Business & Economics; Operations Research & Management Science GA FR493 UT WOS:A1991FR49300005 ER PT J AU SMITH, DL SKUTA, GL LINDENMUTH, KA MUSCH, DC BERGSTROM, TJ AF SMITH, DL SKUTA, GL LINDENMUTH, KA MUSCH, DC BERGSTROM, TJ TI THE EFFECT OF GLAUCOMA FILTERING SURGERY ON CORNEAL ENDOTHELIAL-CELL DENSITY SO OPHTHALMIC SURGERY AND LASERS LA English DT Article ID ANGLE-CLOSURE GLAUCOMA; THERAPY AB Corneal endothelial cell counts were obtained preoperatively and 3 months postoperatively in 46 eyes undergoing glaucoma filtering surgery. Average central endothelial cell loss in eyes without postoperative iridocorneal touch was 1.6%. In eyes with iridocorneal touch (Spaeth's grades 1 and 2), the average cell counts decreased by 7.1% and 9.3%, respectively. The average loss for combined grades 1 and 2 (8.1%) approached statistical significance (P +/- .06). The average loss in two patients with corneolenticular touch (Spaeth's grade 3) was greater than 50%. These findings suggest that early postoperative iridocorneal touch is unlikely to lead to corneal compromise in most eyes, but that corneolenticular touch can result in severe endothelial cell loss. C1 UNIV MICHIGAN,WK KELLOGG EYE CTR,DEPT OPHTHALMOL,ANN ARBOR,MI 48109. UNIV ILLINOIS,CTR EYE,CHICAGO,IL 60680. RP SMITH, DL (reprint author), USN,BETHESDA NAVAL HOSP,DEPT OPHTHALMOL,BETHESDA,MD 20814, USA. NR 17 TC 25 Z9 27 U1 1 U2 3 PU SLACK INC PI THOROFARE PA 6900 GROVE RD, THOROFARE, NJ 08086 SN 0022-023X J9 OPHTHALMIC SURG LAS JI Ophthalmic Surg. Lasers PD MAY PY 1991 VL 22 IS 5 BP 251 EP 255 PG 5 WC Ophthalmology; Surgery SC Ophthalmology; Surgery GA FM175 UT WOS:A1991FM17500002 PM 1852377 ER PT J AU FUSINA, R AF FUSINA, R TI LINEAR-POLARIZATION OF RADIATION FROM PLANAR CHANNELED ELECTRONS AND POSITRONS SO PHYSICAL REVIEW B LA English DT Note ID CHARGED-PARTICLES AB The polarization of channeling radiation emitted by planar channeled electrons and positrons has been calculated using the many-beam method. The radiation was found to be almost completely polarized in the direction perpendicular to the channeling plane for emission in the forward direction. This is an exact, analytical result and holds for all instances in which the particles satisfy the conditions for planar channeling. RP FUSINA, R (reprint author), USN,RES LAB,COMPLEX SYST THEORY BRANCH,CODE 4694,WASHINGTON,DC 20375, USA. NR 9 TC 2 Z9 2 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD MAY 1 PY 1991 VL 43 IS 13 BP 11367 EP 11369 DI 10.1103/PhysRevB.43.11367 PN B PG 3 WC Physics, Condensed Matter SC Physics GA FL041 UT WOS:A1991FL04100063 ER PT J AU IDZERDA, YU PRINZ, GA AF IDZERDA, YU PRINZ, GA TI INCIDENT-BEAM ENHANCEMENTS OF AUGER-ELECTRON SCATTERING SO PHYSICAL REVIEW B LA English DT Note ID DIFFRACTION; SPECTROSCOPY; ANGLE; INTERFACES; EMISSION AB The role of scattering of the incident excitation electrons is examined by use of judiciously chosen scattering geometries that allow for the experimental separation of incident-beam effects and Auger-electron-scattering effects. The scattering of 4-keV incident electrons can result in variations greater than 25% of the Auger electron intensity for scattering from bcc Fe(001). A simple procedure for detecting the presence of incident-beam effects in other systems is given. RP IDZERDA, YU (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 16 TC 27 Z9 27 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD MAY 1 PY 1991 VL 43 IS 13 BP 11460 EP 11463 DI 10.1103/PhysRevB.43.11460 PN B PG 4 WC Physics, Condensed Matter SC Physics GA FL041 UT WOS:A1991FL04100093 ER PT J AU LI, C KAILASANATH, K BOOK, DL AF LI, C KAILASANATH, K BOOK, DL TI MIXING ENHANCEMENT BY EXPANSION WAVES IN SUPERSONIC FLOWS OF DIFFERENT DENSITIES SO PHYSICS OF FLUIDS A-FLUID DYNAMICS LA English DT Article ID RAYLEIGH-TAYLOR INSTABILITY; TURBULENT AB When expansion waves pass through an interface between compressible fluids of different densities, the interface is Rayleigh-Taylor unstable if the low-density fluid is accelerated into the high-density fluid by the pressure gradient associated with the expansion waves. Numerical simulations of the evolution of interface structures interacting with expansion waves launched by a piston receding from the interface show rapid growth of mushroomlike structures from small disturbances. This is an indication of a strong Rayleigh-Taylor instability on the interface. In order to study the application of this concept to mixing enhancement in supersonic flows, simulations of a shear layer formed by supersonic flows of different densities passing through expansion waves have been performed. It is found that this instability enhances mixing by creating vorticity when the expansion waves generate a negative scalar product of the density and pressure gradients in the interface region. RP USN, RES LAB, COMPUTAT PHYS & FLUID DYNAM LAB, WASHINGTON, DC 20375 USA. NR 12 TC 7 Z9 7 U1 0 U2 5 PU AMER INST PHYSICS PI MELVILLE PA 1305 WALT WHITMAN RD, STE 300, MELVILLE, NY 11747-4501 USA SN 0899-8213 J9 PHYS FLUIDS A-FLUID PD MAY PY 1991 VL 3 IS 5 BP 1369 EP 1373 DI 10.1063/1.858066 PN 2 PG 5 WC Mechanics; Physics, Fluids & Plasmas SC Mechanics; Physics GA FL372 UT WOS:A1991FL37200043 ER PT J AU AYLESWORTH, K AF AYLESWORTH, K TI WHERE ARE THE JOBS FOR YOUNG PHYSICISTS SO PHYSICS TODAY LA English DT Letter RP AYLESWORTH, K (reprint author), USN,RES LAB,YOUNG SCI NETWORK,CODE 6342,WASHINGTON,DC 20375, USA. NR 3 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 0031-9228 J9 PHYS TODAY JI Phys. Today PD MAY PY 1991 VL 44 IS 5 BP 99 EP 99 DI 10.1063/1.2810129 PG 1 WC Physics, Multidisciplinary SC Physics GA FL724 UT WOS:A1991FL72400020 ER PT J AU TSYPKIN, M AF TSYPKIN, M TI THE SOVIET MILITARY - GLASNOST AGAINST SECRECY SO PROBLEMS OF COMMUNISM LA English DT Article RP TSYPKIN, M (reprint author), USN,POSTGRAD SCH,MONTEREY,CA 93940, USA. NR 56 TC 0 Z9 0 U1 0 U2 0 PU US GOVERNMENT PRINTING OFFICE PI WASHINGTON PA SUPT OF DOCUMENTS, WASHINGTON, DC 20402-9325 SN 0032-941X J9 PROBL COMMUNISM PD MAY-JUN PY 1991 VL 40 IS 3 BP 51 EP 66 PG 16 WC Economics; Political Science SC Business & Economics; Government & Law GA FR719 UT WOS:A1991FR71900004 ER PT J AU DAVIS, RF KELNER, G SHUR, M PALMOUR, JW EDMOND, JA AF DAVIS, RF KELNER, G SHUR, M PALMOUR, JW EDMOND, JA TI THIN-FILM DEPOSITION AND MICROELECTRONIC AND OPTOELECTRONIC DEVICE FABRICATION AND CHARACTERIZATION IN MONOCRYSTALLINE ALPHA AND BETA SILICON-CARBIDE SO PROCEEDINGS OF THE IEEE LA English DT Article ID CHEMICAL-VAPOR-DEPOSITION; FIELD-EFFECT TRANSISTORS; LIGHT-EMITTING-DIODES; SIC SINGLE-CRYSTALS; ELECTRON-ENERGY-LOSS; HETEROJUNCTION BIPOLAR-TRANSISTORS; GAS-SOURCE MBE; TEMPERATURE-DEPENDENCE; BLUE-LIGHT; EPITAXIAL-GROWTH AB The unique thermal and electronic properties of silicon carbide provide multiplicative combinations of attributes which lead to one of the highest figures of merit for any semiconductor material for use in high-power, -speed, -temperature, -frequency and radiation hard applications. Structurally, silicon carbide exists in a host of polytypes, the origins of which are incompletely understood. The continual development of the deposition of silicon carbide thin films and the associated technologies of impurity incorporation, etching, surface chemistry, and electrical contacts have culminated in a host of solid-state devices including field effect transistors capable of operation to 925 K. The results of these several research programs in the United States, Japan and the Soviet Union, and the remaining challenges related to the development of silicon carbide vis a vis microelectronics are presented and discussed in this review. C1 CREE RES INC, DURHAM, NC 27713 USA. USN, RES LAB, DIV ELECTR SCI & TECHNOL, WASHINGTON, DC 20375 USA. UNIV VIRGINIA, DEPT ELECT ENGN, CHARLOTTESVILLE, VA 22903 USA. RP N CAROLINA STATE UNIV, DEPT MAT SCI & ENGN, BOX 7907, RALEIGH, NC 27695 USA. RI Davis, Robert/A-9376-2011; Shur, Michael/A-4374-2016 OI Davis, Robert/0000-0002-4437-0885; Shur, Michael/0000-0003-0976-6232 NR 171 TC 384 Z9 393 U1 1 U2 50 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI PISCATAWAY PA 445 HOES LANE, PISCATAWAY, NJ 08855-4141 USA SN 0018-9219 EI 1558-2256 J9 P IEEE JI Proc. IEEE PD MAY PY 1991 VL 79 IS 5 BP 677 EP 701 DI 10.1109/5.90132 PG 25 WC Engineering, Electrical & Electronic SC Engineering GA FV082 UT WOS:A1991FV08200006 ER PT J AU MCNELLEY, TR KALU, PN AF MCNELLEY, TR KALU, PN TI THE EFFECTS OF THERMOMECHANICAL PROCESSING ON THE AMBIENT-TEMPERATURE PROPERTIES AND AGING RESPONSE OF A 6061 A1-A12O3 COMPOSITE SO SCRIPTA METALLURGICA ET MATERIALIA LA English DT Article ID METAL-MATRIX COMPOSITES; SOLIDIFICATION RP MCNELLEY, TR (reprint author), USN,POSTGRAD SCH,DEPT MECH ENGN,MONTEREY,CA 93943, USA. NR 14 TC 27 Z9 27 U1 0 U2 0 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0956-716X J9 SCRIPTA METALL MATER JI Scr. Metall. Materialia PD MAY PY 1991 VL 25 IS 5 BP 1041 EP 1046 DI 10.1016/0956-716X(91)90498-P PG 6 WC Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Materials Science; Metallurgy & Metallurgical Engineering GA FJ690 UT WOS:A1991FJ69000011 ER PT J AU LLOPIS, O PARRA, T OUSSET, JC CHRISEY, DB HORWITZ, JS GRAFFEUIL, J AF LLOPIS, O PARRA, T OUSSET, JC CHRISEY, DB HORWITZ, JS GRAFFEUIL, J TI COMPARATIVE-STUDY OF MICROWAVE SURFACE IMPEDANCE OF HIGH-TC SUPERCONDUCTOR SAMPLES SO SOLID STATE COMMUNICATIONS LA English DT Article ID PENETRATION DEPTH; FILMS AB The microwave properties of three different (RE)BaCuO superconductor samples (RE = rare earth) are investigated by measuring surface impedance so as to identify the conduction mechanism involved. Although all these samples (bulk and thin film, laser ablated and co-evaporated) demonstrate similar low surface resistance (10 to 100 m-OMEGA at 77 K and 20 GHz) it is shown, from surface impedance measurements vs frequency and temperature, that the conduction mechanisms involved vary greatly according to the sample considered; an interpretation is proposed based on the relative value of the penetration depth and the normal skin depth. C1 UNIV PAUL SABATIER,F-31077 TOULOUSE,FRANCE. CTR RECH PONT MOUSSON,LAB CNRS ST GOBAIN,F-54704 PONT A MOUSSON,FRANCE. USN,RES LAB,WASHINGTON,DC 20375. RP LLOPIS, O (reprint author), CNRS,LAAS,7 AV COLONEL ROCHE,F-31077 TOULOUSE,FRANCE. NR 8 TC 6 Z9 6 U1 0 U2 0 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0038-1098 J9 SOLID STATE COMMUN JI Solid State Commun. PD MAY PY 1991 VL 78 IS 7 BP 631 EP 633 DI 10.1016/0038-1098(91)90391-8 PG 3 WC Physics, Condensed Matter SC Physics GA FP664 UT WOS:A1991FP66400012 ER PT J AU MINK, RB DUTKA, AJ HALLENBECK, JM AF MINK, RB DUTKA, AJ HALLENBECK, JM TI ALLOPURINOL PRETREATMENT IMPROVES EVOKED-RESPONSE RECOVERY FOLLOWING GLOBAL CEREBRAL-ISCHEMIA IN DOGS SO STROKE LA English DT Article DE ALLOPURINOL; CEREBRAL ISCHEMIA; XANTHINE OXIDASE; DOGS ID XANTHINE-OXIDASE INHIBITOR; RAT-LIVER; REPERFUSION INJURY; OXIDATIVE STRESS; BRAIN; MALONDIALDEHYDE; DEHYDROGENASE; RADICALS; TISSUES; MALONALDEHYDE AB The reperfusion of previously ischemic tissue may lead to the formation of highly reactive free radicals that promote tissue injury. Xanthine oxidase has been implicated as one source of these free radicals. We examined the role of xanthine oxidase in brain injury using a cerebrospinal fluid compression model of global cerebral ischemia with 15 minutes of ischemia and 4 hours of reperfusion. Seven dogs were pretreated with the xanthine oxidase inhibitor allopurinol (50 mg/kg for 5 days). Neurophysiological recovery was monitored with cortical somatosensory evoked potentials. As an attempt to correlate brain recovery with the mechanism of protection, free brain malondialdehyde was measured at the end of reperfusion by high-performance liquid chromatography. Brain water content was measured by wet-dry weights. Compared with seven untreated control dogs, allopurinol pretreatment significantly improved recovery of somatosensory evoked potentials after 4 hours of reperfusion. However, the amount of free malondialdehyde in the allopurinol-treated dogs was 32% greater than that in the controls. Brain water content was similar in the two groups. These results suggest that xanthine oxidase contributes to brain injury after ischemia and reperfusion. However, tissue damage caused by xanthine oxidase may be mediated through mechanisms other than free radical production. C1 CHILDRENS HOSP,NATL MED CTR,DEPT CRIT CARE MED,WASHINGTON,DC 20010. RP MINK, RB (reprint author), USN,MED RES INST,NATL NAVAL MED CTR,DEPT DIVING MED,MAILSTOP 38,BETHESDA,MD 20814, USA. NR 37 TC 27 Z9 28 U1 0 U2 0 PU AMER HEART ASSOC PI DALLAS PA 7272 GREENVILLE AVENUE, DALLAS, TX 75231-4596 SN 0039-2499 J9 STROKE JI Stroke PD MAY PY 1991 VL 22 IS 5 BP 660 EP 665 PG 6 WC Clinical Neurology; Peripheral Vascular Disease SC Neurosciences & Neurology; Cardiovascular System & Cardiology GA FL344 UT WOS:A1991FL34400016 PM 2028498 ER PT J AU HUTSON, FL RAMAKER, DE KOEL, BE AF HUTSON, FL RAMAKER, DE KOEL, BE TI SPECTROSCOPIC EVIDENCE FOR CARBON CARBON BONDING IN CARBIDIC LAYERS ON METALS SO SURFACE SCIENCE LA English DT Article ID AUGER LINE-SHAPE; TROPSCH HYDROCARBON SYNTHESIS; ELECTRONIC-STRUCTURE; GRAPHITIC CARBON; THERMAL-DECOMPOSITION; RESONANT EXCITATION; TRANSITION-METALS; NI(111) SURFACES; NICKEL SURFACES; ETHYLENE AB We examine previously reported ultraviolet photoelectron, CK electron energy loss, and CKVV Auger spectroscopic data from "carbidic" layers formed at temperatures between 500 and 650 K on Ni(100) and Ni(111). The "carbidic" layers studied were made from either CO or C2H4 exposure to the metal surface. These data indicate that significant amounts of carbon-carbon bonding exists on the surface in addition to the carbon-metal bonding with the substrate, revealing the presence of chemisorbed species, such as C2, and maybe even C3, etc. Quantitative interpretations of the Auger data indicate that 20 to 30% of the total electron density has carbon-carbon bonding character. Observed changes in the spectra obtained from different surfaces or at different coverages are accounted for by variations in the fraction of carbon-carbon bonding character. C1 USN,RES LAB,DIV CHEM,WASHINGTON,DC 20375. UNIV COLORADO,DEPT CHEM & BIOCHEM,BOULDER,CO 80309. UNIV COLORADO,NOAA,COOPERAT INST RES ENVIRONM SCI,BOULDER,CO 80309. RP HUTSON, FL (reprint author), GEORGE WASHINGTON UNIV,DEPT CHEM,WASHINGTON,DC 20052, USA. RI Koel, Bruce/H-3857-2013 OI Koel, Bruce/0000-0002-0032-4991 NR 71 TC 27 Z9 27 U1 0 U2 5 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0039-6028 J9 SURF SCI JI Surf. Sci. PD MAY PY 1991 VL 248 IS 1-2 BP 104 EP 118 DI 10.1016/0039-6028(91)90065-Z PG 15 WC Chemistry, Physical; Physics, Condensed Matter SC Chemistry; Physics GA FT809 UT WOS:A1991FT80900017 ER PT J AU HUTSON, FL RAMAKER, DE KOEL, BE GEBHARD, SC AF HUTSON, FL RAMAKER, DE KOEL, BE GEBHARD, SC TI INTERPRETATION OF THE CARBON AUGER LINE-SHAPES FOR THE ADSORPTION AND DECOMPOSITION OF ETHYLENE ON NI(100) SO SURFACE SCIENCE LA English DT Article ID ENERGY LOSS SPECTROSCOPY; SINGLE-CRYSTAL SURFACES; NARROW-BAND METALS; ELECTRON-SPECTROSCOPY; THERMAL-DECOMPOSITION; RESONANT EXCITATION; GRAPHITIC CARBON; CHEMISORBED CO; NICKEL CARBIDE; FINE-STRUCTURE AB The CKVV Auger line shapes of ethylene chemisorbed on Ni(100) at 100, 250, 300 and 600 K are reported and consistently interpreted. These line shapes are representative of pi-bonded ethylene (C2H4(a)) at 100 K, sigma-bonded vinyl (CHCH2(a)) at 250 K, a mixture of ethynyl (CCH(a)), methylidyne (CH(a)) and di-sigma-bonded acetylene (HCCH(a)) at 300 K, and carbidic carbon (C(a)) at 600 K on the surface. The Auger line shape of graphitic carbon adlayers on Ni is also interpreted. The line shapes are found to consist of adsorbate-adsorbate, adsorbate-substrate, and substrate-substrate components, which are denoted by the final location of the two holes created by the Auger process. The adsorbate-adsorbate component, for the C2 chemisorbed species, reflects primarily the valence density of states of ethylene and shows negligible hole-hole correlation effects due to electron transfer from the metal. This is in contrast to the graphitic adlayer where the adsorbate-adsorbate component has the same tine shape as bulk graphite and exhibits significant correlation effects. The adsorbate-substrate and substrate-substrate components seen in all of the tine shapes directly reflect the adsorbate-substrate pi or sigma-bonding character, and the extent of screening via charge transfer from the metal to the core excited adsorbate. C1 USN,RES LAB,DIV CHEM,WASHINGTON,DC 20375. UNIV COLORADO,DEPT CHEM & BIOCHEM,BOULDER,CO 80309. UNIV COLORADO,NOAA,COOPERAT INST RES ENVIRONM SCI,BOULDER,CO 80309. RP HUTSON, FL (reprint author), GEORGE WASHINGTON UNIV,DEPT CHEM,WASHINGTON,DC 20052, USA. RI Koel, Bruce/H-3857-2013 OI Koel, Bruce/0000-0002-0032-4991 NR 81 TC 17 Z9 17 U1 0 U2 2 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0039-6028 J9 SURF SCI JI Surf. Sci. PD MAY PY 1991 VL 248 IS 1-2 BP 119 EP 133 DI 10.1016/0039-6028(91)90066-2 PG 15 WC Chemistry, Physical; Physics, Condensed Matter SC Chemistry; Physics GA FT809 UT WOS:A1991FT80900018 ER PT J AU BERMUDEZ, VM PROKES, SM AF BERMUDEZ, VM PROKES, SM TI INFRARED REFLECTION ABSORPTION-SPECTROSCOPY OF ADSORBATES ON SEMICONDUCTORS WITH BURIED METAL LAYERS - O-2/GAAS SO SURFACE SCIENCE LA English DT Article ID SURFACES; GAAS; CHEMISORPTION; GAAS(100) AB A technique is described whereby infrared reflection-absorption spectra of submonolayer coverages of small molecules adsorbed on ordered single-crystal surfaces of elemental and compound semiconductors can be obtained in a single external reflection. Molecular beam epitaxy is used to form a "buried metal layer" under the semiconductor surface of interest. Spectra can then be obtained at grazing incidence in p-polarization, as for a bare metal substrate. The method is illustrated for H on Si and O on GaAs. RP BERMUDEZ, VM (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 21 TC 32 Z9 32 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0039-6028 J9 SURF SCI JI Surf. Sci. PD MAY PY 1991 VL 248 IS 1-2 BP 201 EP 206 DI 10.1016/0039-6028(91)90073-2 PG 6 WC Chemistry, Physical; Physics, Condensed Matter SC Chemistry; Physics GA FT809 UT WOS:A1991FT80900025 ER PT J AU SCHWARTZ, C KARIMI, M ZHANG, J VIDALI, G AF SCHWARTZ, C KARIMI, M ZHANG, J VIDALI, G TI THE INTERACTION POTENTIAL AND DERIVED SCATTERING AND THERMODYNAMIC QUANTITIES OF H-2 WITH THE MGO(001) SURFACE SO SURFACE SCIENCE LA English DT Article ID INELASTIC-SCATTERING; COUPLED EQUATIONS; PLATED GRAPHITE; ELECTRON-GAS; ADSORPTION; HELIUM; ATOMS; HE; MODEL; MGO AB The interaction potential for H-2 interacting with the (001) MgO surface has been constructed using effective medium theory (EMT). We have then calculated the band structure of a H-2 molecule moving in the laterally modulated molecule-surface potential, the isosteric, and specific heats. The calculated quantities have also been compared with recent thermodynamic measurements of H-2 on MgO powders. In addition, the specular scattering intensity has been calculated as a function of incident polar angle along the high symmetry directions. C1 ALABAMA A&M UNIV,DEPT PHYS,NORMAL,AL 35762. SYRACUSE UNIV,DEPT PHYS,SYRACUSE,NY 13244. RP SCHWARTZ, C (reprint author), USN,CTR WEAP,RES DEPT,DIV PHYS,CHINA LAKE,CA 93555, USA. NR 32 TC 3 Z9 3 U1 0 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0039-6028 J9 SURF SCI JI Surf. Sci. PD MAY PY 1991 VL 247 IS 1 BP 51 EP 57 DI 10.1016/0039-6028(91)90194-W PG 7 WC Chemistry, Physical; Physics, Condensed Matter SC Chemistry; Physics GA FM847 UT WOS:A1991FM84700014 ER PT J AU YOUSSEF, FG MANSOUR, NS AZIZ, AG AF YOUSSEF, FG MANSOUR, NS AZIZ, AG TI EARLY DIAGNOSIS OF HUMAN FASCIOLIASIS BY THE DETECTION OF COPRO-ANTIGENS USING COUNTERIMMUNOELECTROPHORESIS SO TRANSACTIONS OF THE ROYAL SOCIETY OF TROPICAL MEDICINE AND HYGIENE LA English DT Article ID HEPATICA AB We have reported the use of partially purified Fasciola gigantica worm antigens (peak II and III separated by Sephadex G-200) in counterimmunoelectrophoresis (CIEP) for the specific and early detection of antibodies in sera of fascioliasis patients. In the present study, we report the use of hyperimmune serum from rabbits immunized with these partially purified worm antigens in CIEP for the detection of parasite antigens in saline extracts of patients' stools. This test was conducted on stool specimens from 144 patients with systemic or intestinal parasitic infections, 5 from persons with spurious Fasciola infections, and 10 from healthy negative controls. All saline extracts from fascioliasis patients developed 2-5 precipitin bands. No precipitin band developed with stool extracts of patients with spurious Fasciola infection or other parasitic infections or from negative controls. This assay proved to be simple, rapid, sensitive, and specific for the diagnosis of early as well as established fascioliasis infections. RP YOUSSEF, FG (reprint author), USN,DIV PARASITOL,USN,MED RES UNIT 3,CAIRO,EGYPT. NR 6 TC 12 Z9 14 U1 0 U2 2 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 MAY-JUN PY 1991 VL 85 IS 3 BP 383 EP 384 DI 10.1016/0035-9203(91)90300-N PG 2 WC Public, Environmental & Occupational Health; Tropical Medicine SC Public, Environmental & Occupational Health; Tropical Medicine GA FU718 UT WOS:A1991FU71800017 PM 1949144 ER PT J AU HAMMOND, C IMAM, MA AF HAMMOND, C IMAM, MA TI PHOTOEMISSION ELECTRON-MICROSCOPY IN METALLURGICAL RESEARCH - APPLICATIONS USING THE BALZER KE3 METIOSCOPE SO ULTRAMICROSCOPY LA English DT Article ID EMISSION AB The sources of contrast in metals and alloys, which are exploited in photoemission electron microscopy, and the problems of image interpretation which may arise, are summarised and discussed in relation to the design of the Balzers KE3 Metioscope. The preparation procedures for the different types of specimen which may be used are briefly described. The relative advantages and disadvantages of photoemission electron microscopy in comparison with other "in situ" high-temperature dynamical microscopical techniques are discussed in relation to the field of metallurgical research, and some examples of recent results obtained with the Balzers KE3 Metioscope are given which illustrate the potential of the technique. C1 USN,RES LAB,DIV MAT SCI & TECHNOL,WASHINGTON,DC 20375. RP HAMMOND, C (reprint author), UNIV LEEDS,SCH MAT,LEEDS LS2 9JT,W YORKSHIRE,ENGLAND. NR 16 TC 3 Z9 3 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 MAY PY 1991 VL 36 IS 1-3 BP 173 EP 185 DI 10.1016/0304-3991(91)90149-Z PG 13 WC Microscopy SC Microscopy GA FR138 UT WOS:A1991FR13800015 ER PT J AU GORMAN, MR ZIOLA, SM AF GORMAN, MR ZIOLA, SM TI PLATE WAVES PRODUCED BY TRANSVERSE MATRIX CRACKING SO ULTRASONICS LA English DT Article DE ACOUSTIC EMISSION; COMPOSITE MATERIALS; PLATE WAVES; TRANSVERSE MATRIX CRACKING AB Transverse matrix cracks were induced in cross-ply laminate graphite/epoxy coupons by tensile loading. The resulting acoustic emission (AE) was shown to consist of plate waves. Both the extensional mode and flexural mode were detected. The extensional mode contained higher frequency components of larger amplitude than the flexural mode. By filtering out the flexural wave components, the location accuracy of the conventional AE analyser was improved by an order of magnitude. The use of a broader bandwidth, point-like transducer is discussed and conclusions are drawn about the use of pencil lead breaks for location calibration. The simplicity of the results in this paper suggests that they will have many practical applications. RP GORMAN, MR (reprint author), AERONAUT & ASTRONAUT NAVAL POSTGRAD SCH,MONTEREY,CA 93943, USA. NR 15 TC 49 Z9 49 U1 1 U2 11 PU BUTTERWORTH-HEINEMANN LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, OXON, ENGLAND OX5 1GB SN 0041-624X J9 ULTRASONICS JI Ultrasonics PD MAY PY 1991 VL 29 IS 3 BP 245 EP 251 DI 10.1016/0041-624X(91)90063-E PG 7 WC Acoustics; Radiology, Nuclear Medicine & Medical Imaging SC Acoustics; Radiology, Nuclear Medicine & Medical Imaging GA FN141 UT WOS:A1991FN14100009 ER PT J AU ROLLINS, DM AF ROLLINS, DM TI DIVING EQUIPMENT AS PROTECTION AGAINST MICROBIAL HAZARDS SO UNDERSEA BIOMEDICAL RESEARCH LA English DT Article; Proceedings Paper CT INTERNATIONAL SYMP ON DIVING IN HAZARDOUS WATER CY DEC, 1988 CL BETHESDA, MD DE DIVING HELMETS; BACTERIA; DIVE SUITS; BACTERIAL ADHERENCE; DECONTAMINATION PROCEDURES ID BACTERIAL-FLORA RP ROLLINS, DM (reprint author), USN,MED RES INST,DEPT INFECT DIS,BETHESDA,MD 20814, USA. NR 4 TC 1 Z9 2 U1 0 U2 0 PU UNDERSEA & HYPERBARIC MEDICAL SOC INC PI BETHESDA PA 9650 ROCKVILLE PIKE, BETHESDA, MD 20814 SN 0093-5387 J9 UNDERSEA BIOMED RES PD MAY PY 1991 VL 18 IS 3 BP 209 EP 211 PG 3 WC Oceanography SC Oceanography GA FR301 UT WOS:A1991FR30100009 PM 1853474 ER PT J AU NUCKOLS, ML LIPPITT, MW DUDINSKY, J AF NUCKOLS, ML LIPPITT, MW DUDINSKY, J TI THE LIQUID-FILLED SUIT-INTERSUIT CONCEPT - PASSIVE THERMAL PROTECTION FOR DIVERS SO UNDERSEA BIOMEDICAL RESEARCH LA English DT Article; Proceedings Paper CT INTERNATIONAL SYMP ON DIVING IN HAZARDOUS WATER CY DEC, 1988 CL BETHESDA, MD DE THERMAL PROTECTION; HEATING; INTERSUIT; POWER REQUIREMENTS C1 USN,CTR COASTAL SYST,PANAMA CITY,FL 32407. RP NUCKOLS, ML (reprint author), USN ACAD,NAVAL SYST ENGN,ANNAPOLIS,MD 21401, USA. NR 3 TC 1 Z9 1 U1 0 U2 0 PU UNDERSEA & HYPERBARIC MEDICAL SOC INC PI BETHESDA PA 9650 ROCKVILLE PIKE, BETHESDA, MD 20814 SN 0093-5387 J9 UNDERSEA BIOMED RES PD MAY PY 1991 VL 18 IS 3 BP 243 EP 246 PG 4 WC Oceanography SC Oceanography GA FR301 UT WOS:A1991FR30100014 PM 1853479 ER PT J AU SNAIL, KA CRAIGIE, CJ AF SNAIL, KA CRAIGIE, CJ TI SYNTHESIS OF HIGH-QUALITY DIAMOND FILMS IN A TURBULENT FLAME SO APPLIED PHYSICS LETTERS LA English DT Article ID ACETYLENE TORCH; GROWTH AB High quality polycrystalline diamond films have been synthesized in a premixed, turbulent oxygen-acetylene flame, using a commercial brazing torch. The quality of the films was measured by Raman spectroscopy, electron microscopy, and hemispherical transmittance measurements in the ultraviolet, visible, and infrared. Turbulence was achieved by operating the torch with a sufficiently high Reynolds number. The presence of turbulence was confirmed by observations of changes in the flame shape, the characteristic sound of the flame, and calculation of the Reynold's number. C1 UNIV ARIZONA,CTR OPT SCI,TUCSON,AZ 85721. RP SNAIL, KA (reprint author), USN,RES LAB,DIV OPT SCI,CODE 6522,WASHINGTON,DC 20375, USA. NR 19 TC 28 Z9 28 U1 0 U2 3 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0003-6951 J9 APPL PHYS LETT JI Appl. Phys. Lett. PD APR 29 PY 1991 VL 58 IS 17 BP 1875 EP 1877 DI 10.1063/1.105059 PG 3 WC Physics, Applied SC Physics GA FJ597 UT WOS:A1991FJ59700024 ER PT J AU KRIST, AH GODBEY, DJ GREEN, NP AF KRIST, AH GODBEY, DJ GREEN, NP TI SELECTIVE REMOVAL OF A SI0.7GE0.3 LAYER FROM SI(100) SO APPLIED PHYSICS LETTERS LA English DT Article AB The selective removal of epitaxial Si0.7Ge0.3 from {100} silicon using an aqueous based etch is reported. An etch consisting of HNO3:H2O:HF (0.5%), 40:20:5 at 22-degrees-C, removes Si0.7Ge0.3 at a rate of 207 angstrom/min, and removes {100} Si at a rate of 16 angstrom/min. This corresponds to a selectivity of 13 +/- 1 where the selectivity is defined as the ratio of the Si0.7Ge0.3 to {100} Si etch rates. This etch leaves the surface smooth and free from pitting or trenching as observed by optical microscopy. The results obtained are consistent with a germanium enhanced oxidation mechanism of the Si0.7Ge0.3 alloy during semiconductor removal. C1 USN,RES LAB,DIV ELECTR SCI & TECHNOL,CODE 6812,WASHINGTON,DC 20375. SACHS FREEMAN ASSOCIATES INC,LANDOVER,MD 20785. NR 8 TC 18 Z9 18 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 APR 29 PY 1991 VL 58 IS 17 BP 1899 EP 1901 DI 10.1063/1.105067 PG 3 WC Physics, Applied SC Physics GA FJ597 UT WOS:A1991FJ59700032 ER PT J AU GASKILL, DK STAUF, GT BOTTKA, N AF GASKILL, DK STAUF, GT BOTTKA, N TI HIGH-MOBILITY INSB GROWN BY ORGANOMETALLIC VAPOR-PHASE EPITAXY SO APPLIED PHYSICS LETTERS LA English DT Article ID INAS1-XSBX AB The highest mobility InSb epilayer grown to date by organometallic vapor phase epitaxy has been achieved by utilizing high-purity organometallic sources, choosing a reactor geometry to reproducibly control the source concentrations above the substrate, and using a high-integrity reactor system. On a p-type InSb substrate, an unintentionally doped layer had a 77 K n-type carrier concentration and mobility of 1.4 X 10(15) cm-3 and 2.53 X 10(5) cm2/V s. Growths on GaAs substrates were greatly affected by the lattice mismatch and had 77 K carrier concentrations similar to the InSb case but with mobilities of (5.0-9.0) X 10(4) cm2/V s. The crystal quality, morphology, and cyclotron resonance characteristics are reported and found to be comparable to state-of-the-art molecular beam epitaxy layers. RP GASKILL, DK (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 11 TC 55 Z9 55 U1 0 U2 3 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0003-6951 J9 APPL PHYS LETT JI Appl. Phys. Lett. PD APR 29 PY 1991 VL 58 IS 17 BP 1905 EP 1907 DI 10.1063/1.105069 PG 3 WC Physics, Applied SC Physics GA FJ597 UT WOS:A1991FJ59700034 ER PT J AU ROLAND, CM NGAI, KL AF ROLAND, CM NGAI, KL TI DYNAMIC HETEROGENEITY IN A MISCIBLE POLYMER BLEND SO MACROMOLECULES LA English DT Article ID DIELECTRIC-RELAXATION; POLYVINYL ACETATE); AMORPHOUS POLYMERS; GLASS-TRANSITION; LIGHT-SCATTERING; COUPLING MODEL; TEMPERATURE; POLYSTYRENE; VOLUME; TG AB Measurements of dynamic mechanical spectra in the glass transition region for miscible blends of 1,4-polyisoprene and poly(vinylethylene) are reported. In accordance with previous measurements of heat capacity and thermal expansivity, the transition zone is found to be extraordinarily broad when the blend has a high concentration of poly(vinylethylene). The application of the coupling model to the data suggests that this breadth is a manifestation of an inhomogeneous distribution of relaxation times and coupling parameters engendered by concentration fluctuations. Although not experimentally observable herein, a consequence of this dynamical heterogeneity is deviation from the principle of time-temperature superpositioning for miscible polymer mixtures in the glass transition region. The latter is consistent with solid-state C-13 NMR measurements reported previously. RP ROLAND, CM (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 43 TC 162 Z9 162 U1 0 U2 21 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0024-9297 J9 MACROMOLECULES JI Macromolecules PD APR 29 PY 1991 VL 24 IS 9 BP 2261 EP 2265 DI 10.1021/ma00009a021 PG 5 WC Polymer Science SC Polymer Science GA FJ881 UT WOS:A1991FJ88100021 ER PT J AU RICKMAN, LS GORDON, DM WISTAR, R KRZYCH, U GROSS, M HOLLINGDALE, MR EGAN, JE CHULAY, JD HOFFMAN, SL AF RICKMAN, LS GORDON, DM WISTAR, R KRZYCH, U GROSS, M HOLLINGDALE, MR EGAN, JE CHULAY, JD HOFFMAN, SL TI USE OF ADJUVANT CONTAINING MYCOBACTERIAL CELL-WALL SKELETON, MONOPHOSPHORYL LIPID-A, AND SQUALANE IN MALARIA CIRCUMSPOROZOITE PROTEIN VACCINE SO LANCET LA English DT Article ID PLASMODIUM-FALCIPARUM; PHASE-I; MURABUTIDE AB Human immune responses to modern synthetic and recombinant peptide vaccines administered with the standard adjuvant, aluminum hydroxide, tend to be poor, hence the search for better adjuvants. Antibody responses to a Plasmodium falciparum circumsporozoite (CS) protein vaccine, R32NS1(81), administered with an adjuvant containing cell-wall skeleton of mycobacteria and monophosphoryl lipid A in squalane (MPL/CWS) have been compared to responses to the same immunogen administered with aluminum hydroxide. 2 weeks after the third dose the following indices were greater in the 5 patients who received MPL/CWS than in controls (p < 0.05): the geometric mean concentration (2.0 vs 25.4-mu-g/ml) and avidity index of antibodies to the P falciparum CS protein by ELISA, the geometric mean titre to P falciparum sporozoites by IFAT (1/115 vs 1/1600), and the geometric mean inhibition of sporozoite invasion of hepatoma cells in vitro (37.6 vs 90.3%). For R32NS1(81) MPL/CWS is superior to aluminum hydroxide as an adjuvant, and the data support the evaluation of this complex as an adjuvant for other vaccines. C1 USN, MED RES INST,DEPT INFECT DIS,MALARIA PROGRAM, 12300 WASHINGTON AVE, ROCKVILLE, MD 20852 USA. BIOMED RES INST, ROCKVILLE, MD USA. SMITHKLINE BEECHAM, DEPT MOLEC GENET, KING OF PRUSSIA, PA USA. WALTER REED ARMY MED CTR, DEPT IMMUNOL, WASHINGTON, DC 20307 USA. NATL NAVAL MED CTR, DIV INFECT DIS, BETHESDA, MD 20814 USA. NR 18 TC 65 Z9 65 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 APR 27 PY 1991 VL 337 IS 8748 BP 998 EP 1001 DI 10.1016/0140-6736(91)92659-P PG 4 WC Medicine, General & Internal SC General & Internal Medicine GA FJ135 UT WOS:A1991FJ13500003 PM 1673211 ER PT J AU HOFFMAN, SL NUSSENZWEIG, V SADOFF, JC NUSSENZWEIG, RS AF HOFFMAN, SL NUSSENZWEIG, V SADOFF, JC NUSSENZWEIG, RS TI PROGRESS TOWARD MALARIA PREERYTHROCYTIC VACCINES SO SCIENCE LA English DT Editorial Material ID CIRCUMSPOROZOITE PROTEIN; EPITOPE C1 NYU MED CTR,DEPT PATHOL,NEW YORK,NY 10016. NYU MED CTR,KAPLAN CANC CTR,NEW YORK,NY 10016. WALTER REED ARMY MED CTR,DIV COMMUNICABLE DIS & IMMUNOL,WASHINGTON,DC 20307. NYU,SCH MED,DEPT MED & MOLEC PARASITOL,NEW YORK,NY 10010. RP HOFFMAN, SL (reprint author), USN,MED RES INST,BETHESDA,MD 20889, USA. NR 29 TC 38 Z9 38 U1 0 U2 1 PU AMER ASSOC ADVANCEMENT SCIENCE PI WASHINGTON PA 1200 NEW YORK AVE, NW, WASHINGTON, DC 20005 SN 0036-8075 J9 SCIENCE JI Science PD APR 26 PY 1991 VL 252 IS 5005 BP 520 EP 521 DI 10.1126/science.2020852 PG 2 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA FJ127 UT WOS:A1991FJ12700034 PM 2020852 ER PT J AU DULCEY, CS GEORGER, JH KRAUTHAMER, V STENGER, DA FARE, TL CALVERT, JM AF DULCEY, CS GEORGER, JH KRAUTHAMER, V STENGER, DA FARE, TL CALVERT, JM TI DEEP UV PHOTOCHEMISTRY OF CHEMISORBED MONOLAYERS - PATTERNED COPLANAR MOLECULAR ASSEMBLIES SO SCIENCE LA English DT Article ID GOLD AB Deep ultraviolet (UV) irradiation is shown to modify organosilane self-assembled monolayer (SAM) films by a photocleavage mechanism, which renders the surface amenable to further SAM modification. Patterned UV exposure creates alternating regions of intact SAM film and hydrophilic, reactive sites. The exposed regions can undergo a second chemisorption reaction to produce an assembly of SAMs in the same molecular plane with similar substrate attachment chemistry. The UV-patterned films are used as a template for selective buildup of fluorophores, metals, and biological cells. C1 USN,RES LAB,CTR BIOMOLEC SCI & ENGN,CODE 6090,WASHINGTON,DC 20375. GEOCENTERS INC,FT WASHINGTON,MD 20744. US FDA,CTR DEVICES & RADIOL HLTH,ROCKVILLE,MD 20857. NR 17 TC 469 Z9 471 U1 7 U2 50 PU AMER ASSOC ADVANCEMENT SCIENCE PI WASHINGTON PA 1200 NEW YORK AVE, NW, WASHINGTON, DC 20005 SN 0036-8075 J9 SCIENCE JI Science PD APR 26 PY 1991 VL 252 IS 5005 BP 551 EP 554 DI 10.1126/science.2020853 PG 4 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA FJ127 UT WOS:A1991FJ12700042 PM 2020853 ER PT J AU GUAY, D TOURILLON, G DARTYGE, E FONTAINE, A MCBREEN, J PANDYA, KI OGRADY, WE AF GUAY, D TOURILLON, G DARTYGE, E FONTAINE, A MCBREEN, J PANDYA, KI OGRADY, WE TI INSITU TIME-RESOLVED EXAFS STUDY OF THE STRUCTURAL MODIFICATIONS OCCURRING IN NICKEL-OXIDE ELECTRODES BETWEEN THEIR FULLY OXIDIZED AND REDUCED STATES SO JOURNAL OF ELECTROANALYTICAL CHEMISTRY LA English DT Article ID X-RAY ABSORPTION; DISPERSIVE MODE; FUEL-CELL; HYDROXIDE; SPECTROSCOPY AB In-situ time-resolved extended X-ray absorption fine structure (EXAFS) spectroscopy at the Ni K-edge was coupled with cyclic voltammetry to investigate the structural changes occurring in nickel hydroxide electrodes between their fully charged and discharged states. On the negative sweep, analysis of the EXAFS data indicated that the reduction process does not involve the formation of a new compound. The appearance of a second cathodic peak in the cyclic voltammogram is best explained as being due to the formation of an electronically insulating barrier surrounding the active material. On the positive sweep, a threshold potential difference between the onset of the anodic current and that of the electronic and structural modifications was observed. This is due to the fact that the oxidation of the incorporated OH- ions occurs prior to that of the Ni compound. C1 BROOKHAVEN NATL LAB,DEPT APPL SCI,UPTON,NY 11973. USN,RES LAB,WASHINGTON,DC 20375. RP GUAY, D (reprint author), UNIV PARIS 11,UTILISAT RAYONNEMENT ELECTROMAGNET LAB,BATIMENT 209D,F-91405 ORSAY,FRANCE. OI Guay, Daniel/0000-0001-5057-959X NR 35 TC 14 Z9 14 U1 1 U2 8 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 APR 25 PY 1991 VL 305 IS 1 BP 83 EP 95 DI 10.1016/0022-0728(91)85204-3 PG 13 WC Chemistry, Analytical; Electrochemistry SC Chemistry; Electrochemistry GA FQ518 UT WOS:A1991FQ51800007 ER PT J AU PAGE, M BRENNER, DW AF PAGE, M BRENNER, DW TI HYDROGEN ABSTRACTION FROM A DIAMOND SURFACE - ABINITIO QUANTUM CHEMICAL STUDY WITH CONSTRAINED ISOBUTANE AS A MODEL SO JOURNAL OF THE AMERICAN CHEMICAL SOCIETY LA English DT Article ID GROWTH; MECHANISM AB Abstraction of terminal hydrogens on a diamond {111} surface by atomic hydrogen has been offered as the possible rate-determining elementary step in the mechanism of low-pressure diamond growth by chemical vapor deposition. We use ab initio multiconfiguration self-consistent-field methods to estimate the activation energy for this abstraction reaction. We do this by first computing features of the potential energy surface for hydrogen abstraction from gas-phase isobutane and then computing features of the potential energy surface for this same system imposing constraints that mimic those found in a diamond lattice. Our results indicate that, although 5.4 kcal/mol of the CH bond energy in isobutane is attributable to structural relaxation of the radical, most of this radical relaxation energy (4.5 kcal/mol of it) is realized even with geometric constraints similar to those in a diamond lattice. We therefore predict bonds to a diamond surface to be only about 1 kcal/mol stronger than corresponding bonds to a gas-phase tertiary-carbon atom. The effect of the geometrical constraints on the activation energy for the hydrogen abstraction reaction is even smaller: all but 0.2 kcal/mol of the gas-phase radical relaxation energy at the transition state is realized even with the imposition of lattice-type constraints. Our results therefore support the use in kinetic modeling or molecular dynamics simulations of activation energies taken from analogous gas-phase hydrocarbon reactions with little or no adjustment. C1 USN,RES LAB,DIV CHEM,WASHINGTON,DC 20375. RP PAGE, M (reprint author), USN,RES LAB,COMPUTAT PHYS & FLUID DYNAM LAB,CODE 4410,WASHINGTON,DC 20375, USA. RI Brenner, Donald/D-1741-2009 NR 21 TC 59 Z9 59 U1 0 U2 5 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0002-7863 J9 J AM CHEM SOC JI J. Am. Chem. Soc. PD APR 24 PY 1991 VL 113 IS 9 BP 3270 EP 3274 DI 10.1021/ja00009a008 PG 5 WC Chemistry, Multidisciplinary SC Chemistry GA FJ121 UT WOS:A1991FJ12100008 ER PT J AU LUO, H SAMARTH, N ZHANG, FC PAREEK, A DOBROWOLSKA, M FURDYNA, JK MAHALINGAM, K OTSUKA, N CHOU, WC PETROU, A QADRI, SB AF LUO, H SAMARTH, N ZHANG, FC PAREEK, A DOBROWOLSKA, M FURDYNA, JK MAHALINGAM, K OTSUKA, N CHOU, WC PETROU, A QADRI, SB TI MOLECULAR-BEAM EPITAXY OF A LOW STRAIN II-VI-HETEROSTRUCTURE - ZNTE/CDSE SO APPLIED PHYSICS LETTERS LA English DT Article AB We report the growth of a new closely lattice-matched II-VI heterostructure: ZnTe/CdSe (DELTA-alpha/alpha approximately 0.3%). Epilayers of zinc blende CdSe grown on ZnTe buffer layers are shown to have much better quality than those grown earlier (with a 7% mismatch) on GaAs substrates. This permitted the first successful growth of high quality superlattices of ZnTe/CdSe. The superlattices were studied by x-ray diffraction, transmission electron microscopy, and optical techniques. Results of photoluminescence and optical transmission measurements show that ZnTe/CdSe superlattices have a very small valence-band offset. C1 PURDUE UNIV,SCH MAT ENGN,W LAFAYETTE,IN 47907. SUNY BUFFALO,DEPT PHYS,BUFFALO,NY 14260. USN,RES LAB,WASHINGTON,DC 20375. RP LUO, H (reprint author), UNIV NOTRE DAME,DEPT PHYS,NOTRE DAME,IN 46556, USA. RI Samarth, Nitin/C-4475-2014 OI Samarth, Nitin/0000-0003-2599-346X NR 6 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 0003-6951 J9 APPL PHYS LETT JI Appl. Phys. Lett. PD APR 22 PY 1991 VL 58 IS 16 BP 1783 EP 1785 DI 10.1063/1.105090 PG 3 WC Physics, Applied SC Physics GA FH097 UT WOS:A1991FH09700031 ER PT J AU SCOTT, CJ TANG, X SPENCER, MG AF SCOTT, CJ TANG, X SPENCER, MG TI ENHANCED PHOTOEMISSION FROM A BIMETALLIC LAB6/AU PHOTOCATHODE STRUCTURE SO APPLIED PHYSICS LETTERS LA English DT Article ID PHOTOELECTRON AB A bilayer LaB6/Au, laser driven, photoelectron source for high-speed pulsed electron applications has been investigated. Preliminary results show the cathode operating at a quantum efficiency of 1.4 X 10(-5) when illuminated with a mode-locked, frequency quadrupled Nd:YAG, 266 nm laser source. The measured current output at a pressure of 1 X 10(-5) Torr was found to be three times larger than a single-layer gold photocathode structure. C1 HOWARD UNIV,MAT SCI RES CTR EXCELLENCE,WASHINGTON,DC 20059. RP SCOTT, CJ (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 5 TC 1 Z9 1 U1 0 U2 1 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0003-6951 J9 APPL PHYS LETT JI Appl. Phys. Lett. PD APR 22 PY 1991 VL 58 IS 16 BP 1795 EP 1796 DI 10.1063/1.105094 PG 2 WC Physics, Applied SC Physics GA FH097 UT WOS:A1991FH09700035 ER PT J AU COOK, JW EWING, JA AF COOK, JW EWING, JA TI EVIDENCE FOR A 250 2ND BRIGHTNESS OSCILLATION AT 1600-A IN THE SOLAR TEMPERATURE MINIMUM REGION SO ASTROPHYSICAL JOURNAL LA English DT Article DE SUN, ACTIVITY; SUN, OSCILLATIONS; ULTRAVIOLET, GENERAL ID CHROMOSPHERE AB We have studied a 330 s sequence of solar images at 1600 angstrom, where the solar flux arises predominantly from the temperature minimum continuum, obtained from a sounding rocket flight. The statistical distributions of the periods and amplitudes which result from fitting a sine wave to each individual 5 arcsec square box within a 350 x 350 arcsec quiet-Sun field were obtained. We find evidence for 250 s oscillations in the quiet-Sun brightness temperature in approximately 10" coherent patches, with an average amplitude of 50 K. The amplitude corresponds to an energy flux of 1.8 x 10(5) ergs cm-2 s-1 for undamped, adiabatic, propagating sound waves, which is small compared to the heating requirement in the temperature minimum region. RP USN, RES LAB, EO HULBURT CTR SPACE RES, WASHINGTON, DC 20375 USA. NR 16 TC 3 Z9 3 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 APR 20 PY 1991 VL 371 IS 2 BP 804 EP + DI 10.1086/169945 PN 1 PG 1 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA FF983 UT WOS:A1991FF98300037 ER PT J AU MINER, EW SWEAN, TF HANDLER, RA LEIGHTON, RI AF MINER, EW SWEAN, TF HANDLER, RA LEIGHTON, RI TI EXAMINATION OF WALL DAMPING FOR THE KAPPA-EPSILON TURBULENCE MODEL USING DIRECT SIMULATIONS OF TURBULENT CHANNEL FLOW SO INTERNATIONAL JOURNAL FOR NUMERICAL METHODS IN FLUIDS LA English DT Article DE WALL DAMPING; KAPPA-EPSILON MODEL; CHANNEL FLOW; TURBULENCE MODELING; DIRECT SIMULATIONS ID LOW-REYNOLDS-NUMBER; NEAR-WALL; STRESS; CLOSURE AB Handler, Hendricks and Leighton have recently reported results for the direct numerical simulation (DNS) of a turbulent channel flow at moderate Reynolds number. These data are used to evaluate the terms in the exact and modelled transport equations for the turbulence kinetic energy k and the isotropic dissipation function epsilon. Both modelled transport equations show significant imbalances in the high-shear region near the channel walls. The model for the eddy viscosity is found to yield distributions for the production terms which do not agree well with the distributions calculated from the DNS data. The source of the imbalance is attributed to the wall-damping function required in eddy viscosity models for turbulent flows near walls. Several models for the damping function are examined, and it is found that the models do not vary across the channel as does the damping when evaluated from the DNS data. The Lam-Bremhorst model and the standard van Driest model are found to give reasonable agreement with the DNS data. Modification of the van Driest model to include an effective origin yields very good agreement between the modelled production and the production calculated from the DNS data, and the imbalance in the modelled transport equations is significantly reduced. RP MINER, EW (reprint author), USN,RES LAB,CTR FLUID DYNAM DEV,COMP PHYS & FLUID DYNAM LAB,WASHINGTON,DC 20375, USA. NR 16 TC 11 Z9 11 U1 0 U2 1 PU JOHN WILEY & SONS LTD PI W SUSSEX PA BAFFINS LANE CHICHESTER, W SUSSEX, ENGLAND PO19 1UD SN 0271-2091 J9 INT J NUMER METH FL JI Int. J. Numer. Methods Fluids PD APR 20 PY 1991 VL 12 IS 7 BP 609 EP 624 DI 10.1002/fld.1650120702 PG 16 WC Computer Science, Interdisciplinary Applications; Mathematics, Interdisciplinary Applications; Mechanics; Physics, Fluids & Plasmas SC Computer Science; Mathematics; Mechanics; Physics GA FH531 UT WOS:A1991FH53100001 ER PT J AU ADAMS, JS PASTERNACK, L AF ADAMS, JS PASTERNACK, L TI COLLISION-INDUCED INTERSYSTEM CROSSING IN NH(A1-DELTA)-]NH(X3-SIGMA-) SO JOURNAL OF PHYSICAL CHEMISTRY LA English DT Article ID PHOTOFRAGMENT ENERGY-DISTRIBUTIONS; LAMBDA-DOUBLET SELECTIVITY; PHOTO-DISSOCIATION; RATE CONSTANTS; SPIN-DOUBLET; GAS-PHASE; 1A1 STATE; 266 NM; 193 NM; NH AB Laser-induced fluorescence (LIF) of individual rovibronic states of gas-phase NH(a1-DELTA) and NH(X3-SIGMA-) is used to study intersystem crossing (isc) induced by collisions with N2, CO, Xe, and O2. Hydrazoic acid, HN3, is photolyzed at 266 nm to produce NH(a1-DELTA). The time-dependent behavior of NH(a1-DELTA) in its ground and excited vibrational levels is probed by LIF. Appearance rates for NH(X3-SIGMA-) in several vibrational levels are also measured. The vibrational level distribution of NH(X3-SIGMA-) is measured and compared to prior distribution calculations in order to predict the position of the potential energy curve crossing for the collision-induced isc. The results of these measurements on the mechanism of NH(a1-DELTA) decay are discussed in light of recent theoretical calculations and by comparison to isc occurring in the isoelectronic O(1D). C1 USN,RES LAB,DIV CHEM,CODE 6110,WASHINGTON,DC 20375. NR 58 TC 19 Z9 19 U1 1 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 APR 18 PY 1991 VL 95 IS 8 BP 2975 EP 2982 DI 10.1021/j100161a009 PG 8 WC Chemistry, Physical SC Chemistry GA FH098 UT WOS:A1991FH09800009 ER PT J AU FLIPPENANDERSON, JL GEORGE, C GILARDI, R ZAJAC, WW WALTERS, TR MARCHAND, A DAVE, PR ARNEY, BE AF FLIPPENANDERSON, JL GEORGE, C GILARDI, R ZAJAC, WW WALTERS, TR MARCHAND, A DAVE, PR ARNEY, BE TI 5 8,11-SUBSTITUTED PENTACYCLO[5.4.0.02,6.03,10.05,9]UNDECANES SO ACTA CRYSTALLOGRAPHICA SECTION C-CRYSTAL STRUCTURE COMMUNICATIONS LA English DT Article ID 1,3,5,7-TETRAAMINOADAMANTANE; 1,3,5,7-TETRANITROADAMANTANE AB (1) 11-Bromo-11-nitropentacyclo-[5.4.0.0(2,6).0(3,10).0(5,9]undecane-8-one, C11H10BrNO3, M(r) = 284.11, monoclinic, P2(1)/n, a = 11.155 (3), b = 8.180 (2), c = 12.387 (3) angstrom, beta = 113.54 (2)-degrees, V = 1036.2 (5) angstrom 3, Z = 4, D(x) = 1.82 Mg m-3, lambda(Cu K-alpha) = 1.54184 angstrom, mu = 5.39 mm-1, F(000) = 568, T = 295 K, R = 0.038 for 1384 unique observed reflections. (2) 8,11-Dibromo-8,11-dinitropentacyclo[5.4.0.0(2,6).0(3,10).0(5,9)]undecane, C11H10Br2N2O4, M(r) = 394.03, monoclinic, P2(1), a = 6.788 (2), b = 13.696 (4), c = 6.931 (2) angstrom, beta = 107.19 (2)-degrees, V = 615.5 (3) angstrom 3, Z = 2, D(x) = 2.13 Mg m-3, lambda(Cu K-alpha) = 1.54184 angstrom, mu = 8.58 mm-1, F(000) = 384, T = 295 K, R = 0.041 for 1003 unique observed reflections. (3) 8,11-Dichloro-8,11-dinitropentacyclo[5.4.0.0(2,6).0(3,10).0(5,9)]undecane, C11H10Cl2N2O4, M(r) = 305.11, monoclinic, P2(1), a = 6.773 (3), b = 13.579 (7), c = 6.834 (4) angstrom, beta = 107.24 (4)-degrees, V = 600.3 (6) angstrom 3, Z = 2, D(x) = 1.69 Mg m-3, lambda(Mo K-alpha) = 0.71073 angstrom, mu = 0.55 mm-1, F(000) = 312, T = 295 K, R = 0.039 for 969 unique observed reflections. (4) 8,11-Dinitropentacyclo[5.4.0.0(2,6).0(3,10).0(5,9)]-undecane, C11H12N2O4, M(r) = 236.22, monoclinic, P2(1)/c, a = 8.530 (1), b = 9.909 (1), c = 12.277 (1) angstrom, beta = 96.52 (2)-degrees, V = 1031.0 (2) angstrom 3, Z = 4, D(x) = 1.52 Mg m-3, lambda(Cu K-alpha) = 1.54184 angstrom, mu = 0.95 mm-1, F(000) = 496, T = 295 K, R = 0.048 for 1363 unique observed reflections. (5) 8,8,11,11-Tetranitropentacyclo[5.4.0.0(2,6).0(3,10).0(5,9)]undecane, C11H10N4O8, M(r) = 326.18, monoclinic, P2(1)/c, a = 8.602 (2), b = 13.773 (3), c = 10.734 (2) angstrom, beta = 99.73 (1)-degrees, V = 1253.5 (5) angstrom 3, Z = 4, D(x) = 1.73 Mg m-3, Mo K-alpha, lambda = 0.71073 angstrom, mu = 0.14 mm-1, F(000) = 672, T = 223 K, R = 0.046 for 1361 unique observed reflections. The cage moieties in all five structures are quite similar in that the C-C bonds linking the substituted carbons C(8) and C(11) to the cyclobutane ring are abnormally short [av. 1.516 (7) angstrom] as are the bonds involving the bridgehead atom C(4) [av. 1.515 (7) angstrom], while the C-C cage bond across from the cyclobutane ring [C(9)-C(10)], on the other hand, is longer than normal [av. 1.584 (6) angstrom]. C1 VILLANOVA UNIV,DEPT CHEM,VILLANOVA,PA 19085. N TEXAS STATE UNIV,DEPT CHEM,DENTON,TX 76203. RP FLIPPENANDERSON, JL (reprint author), USN,RES LAB,STRUCT MATTER LAB,WASHINGTON,DC 20375, USA. NR 16 TC 16 Z9 16 U1 0 U2 0 PU MUNKSGAARD INT PUBL LTD PI COPENHAGEN PA 35 NORRE SOGADE, PO BOX 2148, DK-1016 COPENHAGEN, DENMARK SN 0108-2701 J9 ACTA CRYSTALLOGR C JI Acta Crystallogr. Sect. C-Cryst. Struct. Commun. PD APR 15 PY 1991 VL 47 BP 813 EP 817 DI 10.1107/S0108270190008563 PN 4 PG 5 WC Chemistry, Multidisciplinary; Crystallography SC Chemistry; Crystallography GA FJ773 UT WOS:A1991FJ77300043 ER PT J AU STINE, GY AF STINE, GY TI AN INVESTIGATION INTO PROPELLANT STABILITY SO ANALYTICAL CHEMISTRY LA English DT Article RP STINE, GY (reprint author), USN,DEPT TEST & EVALUAT,ORDNANCE STN,PROPELLANT ANAL BRANCH,INDIAN HEAD,MD 20640, USA. NR 6 TC 14 Z9 14 U1 0 U2 2 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0003-2700 J9 ANAL CHEM JI Anal. Chem. PD APR 15 PY 1991 VL 63 IS 8 BP A475 EP A478 DI 10.1021/ac00008a002 PG 4 WC Chemistry, Analytical SC Chemistry GA FF992 UT WOS:A1991FF99200003 ER PT J AU AFZAL, RS SCHNEIDER, I AF AFZAL, RS SCHNEIDER, I TI DEVELOPMENT OF HIGH-POWER CW KCL-LI (F2+)A COLOR CENTER LASERS SO JOURNAL OF APPLIED PHYSICS LA English DT Article ID MU-M AB We have developed a KCl:Li (F2+)A color center laser which produces more than 1.2 W of cw laser power, over a factor of 3 greater than the highest power previously reported. This paper contains the results of this study, and presents guidelines for preparing laser crystals to routinely and reproducibly generate these high powers. RP AFZAL, RS (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 17 TC 1 Z9 1 U1 0 U2 0 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0021-8979 J9 J APPL PHYS JI J. Appl. Phys. PD APR 15 PY 1991 VL 69 IS 8 BP 4178 EP 4182 DI 10.1063/1.348385 PN 1 PG 5 WC Physics, Applied SC Physics GA FL728 UT WOS:A1991FL72800002 ER PT J AU GODBEY, DJ TWIGG, ME AF GODBEY, DJ TWIGG, ME TI THE NUCLEATION AND GROWTH OF GERMANIUM ON (11BAR02) SAPPHIRE DEPOSITED BY MOLECULAR-BEAM EPITAXY SO JOURNAL OF APPLIED PHYSICS LA English DT Article ID SUBSTRATE-TEMPERATURE; ULTRAHIGH-VACUUM; GE FILMS; SILICON; SI AB Single-crystal germanium on (110BAR2) sapphire films are grown after a substrate preanneal of 1400-degrees-C at growth temperatures above 700-degrees-C. At a growth temperature of 800-degrees-C, the nucleation site density was approximately 10(11) cm-2. For thin germanium films, the isolated islands were singly oriented, with single-crystal films obtained for thicker grown films. A 400-degrees-C growth temperature on sapphire was insufficiently high to get epitaxial growth and produced polycrystallites. Growth at 400-degrees-C on an 800-degrees-C grown germanium template did result in epitaxy. However, a high fraction of the twinned orientation was produced, resulting in a bicrystalline film. RP GODBEY, DJ (reprint author), USN,RES LAB,DIV ELECTR SCI & TECHNOL,CODE 6812,WASHINGTON,DC 20375, USA. NR 9 TC 3 Z9 3 U1 1 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 APR 15 PY 1991 VL 69 IS 8 BP 4216 EP 4221 DI 10.1063/1.348392 PN 1 PG 6 WC Physics, Applied SC Physics GA FL728 UT WOS:A1991FL72800009 ER PT J AU GULWADI, SM RAO, MV BERRY, AK SIMONS, DS CHI, PH DIETRICH, HB AF GULWADI, SM RAO, MV BERRY, AK SIMONS, DS CHI, PH DIETRICH, HB TI TRANSITION-METAL IMPLANTS IN IN0.53GA0.47AS SO JOURNAL OF APPLIED PHYSICS LA English DT Article ID SHALLOW P+ LAYER; COMPOUND SEMICONDUCTORS; DUAL IMPLANTS; CO-IMPLANT; GAAS; FE; INP; ACTIVATION; ALXGA1-XAS; ENERGY AB Single- and multiple-energy Fe, Cr, and V ions were implanted into InGaAs. Annealing of the implanted InGaAs samples caused a redistribution of the implanted atoms, as determined by secondary ion mass spectrometry. Coimplantation of Fe with P did not prevent this redistribution. A transport equation calculation of Fe-implantation-induced stoichiometric disturbances in InGaAs was done. The lattice quality of implanted InGaAs was investigated by photoreflectance measurements. Fe-implanted InGaAs has a resistivity close to the intrinsic limit, whereas Cr- and V-implanted InGaAs have a lower resistivity than the unimplanted material. C1 NATL INST STAND & TECHNOL,CTR ANALYT CHEM,GAITHERSBURG,MD 20899. USN,RES LAB,WASHINGTON,DC 20375. RP GULWADI, SM (reprint author), GEORGE MASON UNIV,DEPT ELECT & COMP ENGN,FAIRFAX,VA 22030, USA. NR 23 TC 19 Z9 19 U1 1 U2 6 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0021-8979 J9 J APPL PHYS JI J. Appl. Phys. PD APR 15 PY 1991 VL 69 IS 8 BP 4222 EP 4227 DI 10.1063/1.348393 PN 1 PG 6 WC Physics, Applied SC Physics GA FL728 UT WOS:A1991FL72800010 ER PT J AU RAO, MV THOMPSON, PE ECHARD, R MULPURI, S BERRY, AK DIETRICH, HB AF RAO, MV THOMPSON, PE ECHARD, R MULPURI, S BERRY, AK DIETRICH, HB TI BE, S, SI, AND NE ION-IMPLANTATION IN INSB GROWN ON GAAS SO JOURNAL OF APPLIED PHYSICS LA English DT Article ID INDIUM-ANTIMONIDE; DOPED INSB; BOMBARDMENT; BEHAVIOR; MBE AB Single- and multiple-energy Be, S, Si, and Ne ion implantations were performed at room temperature in InSb grown on semi-insulating GaAs substrates. The implanted material was subjected to both isochronal and isothermal annealing schemes. The as-implanted and annealed material was characterized by Hall, secondary ion mass spectrometry, and x-ray rocking curve measurements. The as-implanted material is highly n-type for all implant species used in this study. A maximum p-type activation of 90% and n-type activation of 16% was achieved for Be and S implants, respectively. Be activation depends on the thickness of the InSb layer. No in-diffusion of Be and S was observed even after 500-degrees-C anneal. The Si implant has an amphoteric doping behavior. C1 USN,RES LAB,WASHINGTON,DC 20375. RP RAO, MV (reprint author), GEORGE MASON UNIV,DEPT ELECT & COMP ENGN,FAIRFAX,VA 22030, USA. NR 16 TC 6 Z9 6 U1 1 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 APR 15 PY 1991 VL 69 IS 8 BP 4228 EP 4233 DI 10.1063/1.348394 PN 1 PG 6 WC Physics, Applied SC Physics GA FL728 UT WOS:A1991FL72800011 ER PT J AU RESTORFF, JB WUNFOGLE, M HATHAWAY, KB CLARK, AE AF RESTORFF, JB WUNFOGLE, M HATHAWAY, KB CLARK, AE TI ANISOTROPIC MAGNETORESISTANCE IN MAGNETOSTRICTIVE METGLAS-2605SC FOR STRAIN-GAUGE APPLICATIONS SO JOURNAL OF APPLIED PHYSICS LA English DT Article; Proceedings Paper CT 35TH ANNUAL CONF ON MAGNETISM AND MAGNETIC MATERIALS CY OCT 29-NOV 01, 1990 CL SAN DIEGO, CA SP AMER INST PHYS, IEEE, MAGNET SOC, AMER INST MIN MET & PETR ENGINEERS, MET SOC, USN, OFF NAVAL RES, AMER SOC TESTING & MAT, AMER PHYS SOC, AMER CERAM SOC AB The magnetoresistance of transverse-field-annealed Metglas 2605SC (Fe81B13.5Si3.5C2) ribbons has been measured as a function of both applied field and imposed strain. A maximum magnetoresistance of 0.3%, obtained with applied magnetic field agrees with previous measurements of unannealed samples. The magnetoresistance changes with imposed strain are slightly smaller, and indicate the presence of inhomogeneities in the sample or the imposed strain. RP RESTORFF, JB (reprint author), USN,CTR SURFACE WARFARE,SILVER SPRING,MD 20903, USA. NR 5 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 APR 15 PY 1991 VL 69 IS 8 BP 4668 EP 4670 DI 10.1063/1.348292 PN 2A PG 3 WC Physics, Applied SC Physics GA FL732 UT WOS:A1991FL73200076 ER PT J AU KREBS, JJ LUBITZ, P CHAIKEN, A PRINZ, GA AF KREBS, JJ LUBITZ, P CHAIKEN, A PRINZ, GA TI MAGNETORESISTANCE ORIGIN FOR NONRESONANT MICROWAVE-ABSORPTION IN ANTIFERROMAGNETICALLY COUPLED EPITAXIAL FE/CR/FE(001) SANDWICHES SO JOURNAL OF APPLIED PHYSICS LA English DT Article; Proceedings Paper CT 35TH ANNUAL CONF ON MAGNETISM AND MAGNETIC MATERIALS CY OCT 29-NOV 01, 1990 CL SAN DIEGO, CA SP AMER INST PHYS, IEEE, MAGNET SOC, AMER INST MIN MET & PETR ENGINEERS, MET SOC, USN, OFF NAVAL RES, AMER SOC TESTING & MAT, AMER PHYS SOC, AMER CERAM SOC ID LAYERED MAGNETIC-STRUCTURES; INTERLAYER EXCHANGE; FE LAYERS; GIANT MAGNETORESISTANCE; MULTILAYERED STRUCTURES; CR; SUPERLATTICES; FE/CR AB Nonresonant microwave-absorption signals have been observed in a series of molecular-beam-epitaxy-grown Fe/Cr/Fe (001) sandwiches which were previously shown to exhibit an antiferromagnetic coupling of the two Fe layers. Using field-modulation detection, one observes signals which display an unusual magnetic-field dependence containing sharp features in the range 0-2 kOe. The magnetic-field locations of these features are independent of the microwave frequency, but their intensity depends strongly on the field-modulation amplitude. The features also have a strong in-plane angular dependence. Comparison with earlier magnetization and magnetoresistance data on the same samples shows that a sharp feature occurs when the magnetization orientations in the Fe films change abruptly, and that one can explain the microwave-absorption signals in terms of magnetoresistance effects in the sandwich. Thus, microwave absorption provides a contactless way to investigate the magnetoresistance in such samples. RP KREBS, JJ (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 15 TC 39 Z9 41 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 APR 15 PY 1991 VL 69 IS 8 BP 4795 EP 4797 DI 10.1063/1.348232 PN 2A PG 3 WC Physics, Applied SC Physics GA FL732 UT WOS:A1991FL73200120 ER PT J AU CHAIKEN, A TRITT, TM GILLESPIE, DJ KREBS, JJ LUBITZ, P HARFORD, MZ PRINZ, GA AF CHAIKEN, A TRITT, TM GILLESPIE, DJ KREBS, JJ LUBITZ, P HARFORD, MZ PRINZ, GA TI TEMPERATURE-DEPENDENCE OF MAGNETORESISTANCE IN FE-CR-FE SANDWICHES SO JOURNAL OF APPLIED PHYSICS LA English DT Article; Proceedings Paper CT 35TH ANNUAL CONF ON MAGNETISM AND MAGNETIC MATERIALS CY OCT 29-NOV 01, 1990 CL SAN DIEGO, CA SP AMER INST PHYS, IEEE, MAGNET SOC, AMER INST MIN MET & PETR ENGINEERS, MET SOC, USN, OFF NAVAL RES, AMER SOC TESTING & MAT, AMER PHYS SOC, AMER CERAM SOC ID FE/CR SUPERLATTICES; MAGNETIC-STRUCTURES; LAYERS AB Resistivity measurements have been performed as a function of temperature (1-300 K) and magnetic field (0-10 T) on antiferromagnetically coupled Fe-Cr-Fe sandwiches. Two types of samples were studied: MBE-grown sandwiches deposited epitaxially on the ZnSe (100) surface, and evaporated polycrystalline sandwiches deposited on glass substrates. The magnetic saturation field H(s) determined from the resistivity rho(H,T) is linear with temperature throughout the full temperature range for all samples. In the polycrystalline sandwiches, where the observed in-plane magnetic anisotropy is small, the linearity of H(s)(T) implies that the antiferromagnetic interlayer exchange coupling A12 is also linear with temperature. The magnetoresistance of the sandwiches is constant at low temperature, and decreases linearly with increasing temperature above about 70 K. RP CHAIKEN, A (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 10 TC 40 Z9 40 U1 0 U2 0 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0021-8979 J9 J APPL PHYS JI J. Appl. Phys. PD APR 15 PY 1991 VL 69 IS 8 BP 4798 EP 4800 DI 10.1063/1.348233 PN 2A PG 3 WC Physics, Applied SC Physics GA FL732 UT WOS:A1991FL73200121 ER PT J AU KARIM, R VITTORIA, C WIDOM, A CHRISEY, DB HORWITZ, JB AF KARIM, R VITTORIA, C WIDOM, A CHRISEY, DB HORWITZ, JB TI MAGNETICALLY MODULATED MICROWAVE-ABSORPTION MEASUREMENT OF THE PENETRATION DEPTH IN A POLYCRYSTALLINE YBA2CU3O7-X THIN-FILM SO JOURNAL OF APPLIED PHYSICS LA English DT Article; Proceedings Paper CT 35TH ANNUAL CONF ON MAGNETISM AND MAGNETIC MATERIALS CY OCT 29-NOV 01, 1990 CL SAN DIEGO, CA SP AMER INST PHYS, IEEE, MAGNET SOC, AMER INST MIN MET & PETR ENGINEERS, MET SOC, USN, OFF NAVAL RES, AMER SOC TESTING & MAT, AMER PHYS SOC, AMER CERAM SOC AB In previous work, a magnetically modulated microwave absorption (MMMA) technique to measure the Ginzburg-Landau parameter kappa = (lambda/zeta) in high-T(c) superconductors (bulk samples of YBCO) was described. In this work, how this technique can be applied to the measurement of the London penetration depth lambda is described. Data are reported for the temperature variation of lambda in a well-characterized c-axis-oriented polycrystalline thin film of YBa2Cu3O7-x, prepared by a pulsed laser deposition technique. For low temperatures, lambda(O) congruent-to 3640 angstrom with the microwave electric field oriented parallel to the c axis. The temperature dependence of lambda(O)/lambda(T) can be well described by the two-fluid model. The data are also reasonably fit by a BCS model, however the MMMA technique (in the work here reported) does not have the resolution at low temperatures to obtain strong quantitative evidence for an energy gap DELTA (even if it exists). C1 NORTHEASTERN UNIV,DEPT PHYS,BOSTON,MA 02115. NAVAL RES LAB,WASHINGTON,DC. RP KARIM, R (reprint author), NORTHEASTERN UNIV,DEPT ELECT ENGN,BOSTON,MA 02115, USA. NR 12 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 APR 15 PY 1991 VL 69 IS 8 BP 4891 EP 4893 DI 10.1063/1.348215 PN 2A PG 3 WC Physics, Applied SC Physics GA FL732 UT WOS:A1991FL73200157 ER PT J AU KRAFFT, CS BECKNER, CF AF KRAFFT, CS BECKNER, CF TI MICROWAVE-ABSORPTION MEASUREMENTS OF HIGH-TEMPERATURE SUPERCONDUCTORS USING A COPLANAR WAVE-GUIDE SO JOURNAL OF APPLIED PHYSICS LA English DT Article; Proceedings Paper CT 35TH ANNUAL CONF ON MAGNETISM AND MAGNETIC MATERIALS CY OCT 29-NOV 01, 1990 CL SAN DIEGO, CA SP AMER INST PHYS, IEEE, MAGNET SOC, AMER INST MIN MET & PETR ENGINEERS, MET SOC, USN, OFF NAVAL RES, AMER SOC TESTING & MAT, AMER PHYS SOC, AMER CERAM SOC ID HIGH-TC SUPERCONDUCTORS AB A wideband microwave absorption spectrometer with a coplanar waveguide transmission line was used to characterize the magnetic field dependence of microwave absorption in high temperature superconductors. This technique is useful for the nondestructive evaluation of high temperature superconductor bulk and thin film samples prior to their application in microwave devices and sensors. Results are presented for various types and forms of samples including bulk YBCO, laser-ablated thin film YBCO, and Ag-doped YBCO wire. RP KRAFFT, CS (reprint author), USN,CTR AIR DEV,WARMINSTER,PA 18974, USA. NR 5 TC 2 Z9 2 U1 0 U2 0 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0021-8979 J9 J APPL PHYS JI J. Appl. Phys. PD APR 15 PY 1991 VL 69 IS 8 BP 4907 EP 4909 DI 10.1063/1.348223 PN 2A PG 3 WC Physics, Applied SC Physics GA FL732 UT WOS:A1991FL73200166 ER PT J AU VOHRA, ST BUCHOLTZ, F DAGENAIS, DM KOO, KP AF VOHRA, ST BUCHOLTZ, F DAGENAIS, DM KOO, KP TI SIMULTANEOUS MEASUREMENT OF DYNAMIC STRAIN AND MAGNETIZATION IN METALLIC-GLASS RIBBONS SO JOURNAL OF APPLIED PHYSICS LA English DT Article; Proceedings Paper CT 35TH ANNUAL CONF ON MAGNETISM AND MAGNETIC MATERIALS CY OCT 29-NOV 01, 1990 CL SAN DIEGO, CA SP AMER INST PHYS, IEEE, MAGNET SOC, AMER INST MIN MET & PETR ENGINEERS, MET SOC, USN, OFF NAVAL RES, AMER SOC TESTING & MAT, AMER PHYS SOC, AMER CERAM SOC ID MAGNETOSTRICTION AB A novel technique that simultaneously measures the dynamical magnetic and magnetostrictive properties of transversely annealed metallic glass ribbons (2605S-2) is reported. Magnetostriction was measured with a fiber-optic interferometer while magnetization was obtained with an induction probe. Below resonance, close agreement was found in the values of the anisotropy field H(a) as obtained by each method. Near resonance, the equilibrium coherent rotation model (CRM) is no longer applicable and the dynamics of the sample must be included explicitly in order to derive magnetomechanical parameters under ac drive conditions. Certain parameters were found to depend on the magnitude of the ac excitation field suggesting that nonlinear magnetization must also be considered in the CRM. C1 SFA INC,LANDOVER,MD 20785. RP VOHRA, ST (reprint author), USN,RES LAB,DIV OPT SCI,WASHINGTON,DC 20375, USA. NR 11 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 APR 15 PY 1991 VL 69 IS 8 BP 5005 EP 5007 DI 10.1063/1.348156 PN 2A PG 3 WC Physics, Applied SC Physics GA FL732 UT WOS:A1991FL73200202 ER PT J AU WUNFOGLE, M SAVAGE, HT AF WUNFOGLE, M SAVAGE, HT TI FREQUENCY-DEPENDENCE OF THE HYSTERESIS LOOPS IN AMORPHOUS MAGNETOELASTIC WIRES CONTROLLED BY LONGITUDINAL STRESS AND TORSIONAL STRAIN SO JOURNAL OF APPLIED PHYSICS LA English DT Meeting Abstract C1 LAB SALVADOR VELAYO,E-28230 LAS ROZAS DE MADR,SPAIN. RP WUNFOGLE, M (reprint author), USN,CTR SURFACE WEAP,SILVER SPRING,MD 20903, USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0021-8979 J9 J APPL PHYS JI J. Appl. Phys. PD APR 15 PY 1991 VL 69 IS 8 BP 5027 EP 5027 DI 10.1063/1.348164 PN 2A PG 1 WC Physics, Applied SC Physics GA FL732 UT WOS:A1991FL73200210 ER PT J AU OLIVER, SA VITTORIA, C KREBS, JJ LUBITZ, P PRINZ, GA AF OLIVER, SA VITTORIA, C KREBS, JJ LUBITZ, P PRINZ, GA TI OUT-OF-PLANE FERROMAGNETIC-RESONANCE STUDY OF MAGNETICALLY COUPLED FE/CR/FE FILMS SO JOURNAL OF APPLIED PHYSICS LA English DT Meeting Abstract C1 USN,RES LAB,WASHINGTON,DC 20375. RP OLIVER, SA (reprint author), NORTHEASTERN UNIV,BOSTON,MA 02115, USA. NR 1 TC 0 Z9 0 U1 1 U2 1 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0021-8979 J9 J APPL PHYS JI J. Appl. Phys. PD APR 15 PY 1991 VL 69 IS 8 BP 5320 EP 5320 DI 10.1063/1.348064 PN 2A PG 1 WC Physics, Applied SC Physics GA FL732 UT WOS:A1991FL73200324 ER PT J AU WILLIAMS, CM KREBS, JJ PRINZ, GA CHAIKEN, A AF WILLIAMS, CM KREBS, JJ PRINZ, GA CHAIKEN, A TI MAGNETIC-ANISOTROPY ENERGY OF ANTIFERROMAGNETIC COUPLED FE/CR/FE LAYERS SO JOURNAL OF APPLIED PHYSICS LA English DT Meeting Abstract RP WILLIAMS, CM (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 0 TC 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 APR 15 PY 1991 VL 69 IS 8 BP 5321 EP 5321 DI 10.1063/1.348065 PN 2A PG 1 WC Physics, Applied SC Physics GA FL732 UT WOS:A1991FL73200325 ER PT J AU LETCHER, M JONES, GA LORD, DG WUNFOGLE, M SAVAGE, HT AF LETCHER, M JONES, GA LORD, DG WUNFOGLE, M SAVAGE, HT TI DOMAIN-STRUCTURE OF AS-CAST AND ANNEALED FESIB AMORPHOUS WIRES SO JOURNAL OF APPLIED PHYSICS LA English DT Article; Proceedings Paper CT 35TH ANNUAL CONF ON MAGNETISM AND MAGNETIC MATERIALS CY OCT 29-NOV 01, 1990 CL SAN DIEGO, CA SP AMER INST PHYS, IEEE, MAGNET SOC, AMER INST MIN MET & PETR ENGINEERS, MET SOC, USN, OFF NAVAL RES, AMER SOC TESTING & MAT, AMER PHYS SOC, AMER CERAM SOC ID MAGNETIZATION; STRESS AB The domain structures of amorphous FeSiB wires have been studied as a function of applied field. The main features of as-cast wires are: the proliferation of surface closure domains; a distinction between core and sheath domain behavior; and a reproducible switching behavior. Transverse magnetically annealed wires have larger domains, show little sign of a sheath and a greater variety of domain displacement mechanisms. C1 USN,CTR SURFACE WARFARE,SILVER SPRING,MD 20903. RP LETCHER, M (reprint author), UNIV SALFORD,DEPT PHYS,SALFORD M5 4WT,LANCS,ENGLAND. NR 6 TC 3 Z9 3 U1 1 U2 9 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0021-8979 J9 J APPL PHYS JI J. Appl. Phys. PD APR 15 PY 1991 VL 69 IS 8 BP 5331 EP 5333 DI 10.1063/1.348069 PN 2A PG 3 WC Physics, Applied SC Physics GA FL732 UT WOS:A1991FL73200329 ER PT J AU HARRIS, VG OLIVER, SA NOWAK, WB VITTORIA, C KIM, KH ELAM, WT AF HARRIS, VG OLIVER, SA NOWAK, WB VITTORIA, C KIM, KH ELAM, WT TI CORRELATION OF MAGNETIC-PROPERTIES AND LOCAL ATOMIC-STRUCTURE OBSERVED BY ELECTRON-YIELD EXAFS IN AMORPHOUS CO74FE6B15SI5 THIN-FILMS SO JOURNAL OF APPLIED PHYSICS LA English DT Article; Proceedings Paper CT 35TH ANNUAL CONF ON MAGNETISM AND MAGNETIC MATERIALS CY OCT 29-NOV 01, 1990 CL SAN DIEGO, CA SP AMER INST PHYS, IEEE, MAGNET SOC, AMER INST MIN MET & PETR ENGINEERS, MET SOC, USN, OFF NAVAL RES, AMER SOC TESTING & MAT, AMER PHYS SOC, AMER CERAM SOC ID BEAM AB Thin-film specimens of amorphous Co74Fe6B15Si5 were subjected to heat-treatment procedures followed by room-temperature magnetic and structural characterization in an effort to quantitatively correlate magnetic property changes to local atomic structure. Fourier transforms of electron-yield extended x-ray-absorption fine structure spectra show second and higher atomic shell ordering about transition-metal ions to occur at T(ann) almost-equal-to 300-degrees-C. This ordering evolves to a body-centered atomic structure with heat treatments at higher temperatures. Accompanying this structural evolution is an expansion of the nearest-neighbor distance, disruption of the spin-wave-resonance spectra, and general deterioration of the soft magnetic properties. C1 NORTHEASTERN UNIV,BOSTON,MA 02115. RP HARRIS, VG (reprint author), USN,RES LAB,CODE 4683,WASHINGTON,DC 20375, USA. NR 7 TC 2 Z9 2 U1 0 U2 0 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0021-8979 J9 J APPL PHYS JI J. Appl. Phys. PD APR 15 PY 1991 VL 69 IS 8 BP 5457 EP 5459 DI 10.1063/1.348008 PN 2B PG 3 WC Physics, Applied SC Physics GA FL735 UT WOS:A1991FL73500044 ER PT J AU JONKER, BT PRINZ, GA AF JONKER, BT PRINZ, GA TI GROWTH MODE AND INTERFACE FORMATION OF FE AND CO FILMS ON ZNSE(001) SO JOURNAL OF APPLIED PHYSICS LA English DT Meeting Abstract RP JONKER, BT (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 0 TC 3 Z9 3 U1 1 U2 1 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0021-8979 J9 J APPL PHYS JI J. Appl. Phys. PD APR 15 PY 1991 VL 69 IS 8 BP 5676 EP 5676 DI 10.1063/1.347933 PN 2B PG 1 WC Physics, Applied SC Physics GA FL735 UT WOS:A1991FL73500125 ER PT J AU HATHAWAY, KB CULLEN, JR AF HATHAWAY, KB CULLEN, JR TI THE EFFECT OF VOLUME ON MAGNETIZATION IN RXY1-XCO2 PSEUDOBINARIES SO JOURNAL OF APPLIED PHYSICS LA English DT Meeting Abstract ID ITINERANT RP HATHAWAY, KB (reprint author), USN,SURFACE WARFARE CTR,SILVER SPRING,MD 20903, USA. NR 3 TC 0 Z9 0 U1 1 U2 1 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0021-8979 J9 J APPL PHYS JI J. Appl. Phys. PD APR 15 PY 1991 VL 69 IS 8 BP 5711 EP 5711 DI 10.1063/1.348939 PN 2B PG 1 WC Physics, Applied SC Physics GA FL735 UT WOS:A1991FL73500139 ER PT J AU CARROLL, TL PECORA, LM RACHFORD, FJ AF CARROLL, TL PECORA, LM RACHFORD, FJ TI CHARACTERIZING CHAOS IN MAGNETOSTATIC MODES SO JOURNAL OF APPLIED PHYSICS LA English DT Article; Proceedings Paper CT 35TH ANNUAL CONF ON MAGNETISM AND MAGNETIC MATERIALS CY OCT 29-NOV 01, 1990 CL SAN DIEGO, CA SP AMER INST PHYS, IEEE, MAGNET SOC, AMER INST MIN MET & PETR ENGINEERS, MET SOC, USN, OFF NAVAL RES, AMER SOC TESTING & MAT, AMER PHYS SOC, AMER CERAM SOC ID POWER FERROMAGNETIC-RESONANCE; SPIN-WAVE INSTABILITIES; NUMBER; SPHERE AB The nonlinear behavior seen in ferromagnetic resonance experiments in yttrium iron garnet (YIG) has long proven difficult to model. Time series analysis techniques from nonlinear dynamics have been applied to characterize chaos seen in an experiment involving an YIG film. It is found that this characterization reveals possible shortcomings in some of the common models. C1 USN,RES LAB,WASHINGTON,DC 20375. RP CARROLL, TL (reprint author), SACHS FREEMAN ASSOCIATES INC,LANDOVER,MD 20785, USA. OI Carroll, Thomas/0000-0002-2371-2049 NR 14 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 APR 15 PY 1991 VL 69 IS 8 BP 5727 EP 5729 DI 10.1063/1.347900 PN 2B PG 3 WC Physics, Applied SC Physics GA FL735 UT WOS:A1991FL73500144 ER PT J AU VOHRA, ST BUCHOLTZ, F DAGENAIS, DM KOO, KP AF VOHRA, ST BUCHOLTZ, F DAGENAIS, DM KOO, KP TI DIRECT OBSERVATION OF DYNAMIC STRAIN BIFURCATIONS AND CHAOS IN MAGNETOSTRICTIVE AMORPHOUS RIBBONS SO JOURNAL OF APPLIED PHYSICS LA English DT Article; Proceedings Paper CT 35TH ANNUAL CONF ON MAGNETISM AND MAGNETIC MATERIALS CY OCT 29-NOV 01, 1990 CL SAN DIEGO, CA SP AMER INST PHYS, IEEE, MAGNET SOC, AMER INST MIN MET & PETR ENGINEERS, MET SOC, USN, OFF NAVAL RES, AMER SOC TESTING & MAT, AMER PHYS SOC, AMER CERAM SOC ID OSCILLATOR; DRIVEN AB Period doubling, quasiperiodicity, phase locking, and chaos are observed in the strain dynamics of a magnetically driven magnetostrictive ribbon (Metglas 2605S-2). The dynamic strain response of the ribbon was measured with a fiber-optic Mach-Zehnder interferometer. The predicted universal behavior was characterized with power spectral density measurements and by phase-space flow. The nonlinearity responsible for observing universal behavior in the system does not involve the DELTA-E effect. RP VOHRA, ST (reprint author), USN,RES LAB,DIV OPT SCI,WASHINGTON,DC 20375, USA. NR 9 TC 9 Z9 9 U1 0 U2 0 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0021-8979 J9 J APPL PHYS JI J. Appl. Phys. PD APR 15 PY 1991 VL 69 IS 8 BP 5736 EP 5738 DI 10.1063/1.347903 PN 2B PG 3 WC Physics, Applied SC Physics GA FL735 UT WOS:A1991FL73500147 ER PT J AU TETER, JP MAHONEY, K ALJIBOORY, M LORD, DG MCMASTERS, OD AF TETER, JP MAHONEY, K ALJIBOORY, M LORD, DG MCMASTERS, OD TI DOMAIN OBSERVATION AND MAGNETOSTRICTION IN TB0.3DY0.7FE2 TWINNED SINGLE-CRYSTALS SO JOURNAL OF APPLIED PHYSICS LA English DT Article; Proceedings Paper CT 35TH ANNUAL CONF ON MAGNETISM AND MAGNETIC MATERIALS CY OCT 29-NOV 01, 1990 CL SAN DIEGO, CA SP AMER INST PHYS, IEEE, MAGNET SOC, AMER INST MIN MET & PETR ENGINEERS, MET SOC, USN, OFF NAVAL RES, AMER SOC TESTING & MAT, AMER PHYS SOC, AMER CERAM SOC AB The ternary alloy Tb0.3Dy0.7Fe2 (Terfenol-D) exhibits the largest known magnetostriction to anisotropy ratio near room temperature. To better determine the interaction between the elastic and magnetic properties of this material, a stoichiometric twinned single crystal was grown by a free-standing float-zone technique. Observations using Scanning electron microscopy and energy dispersive spectroscopy confirmed that the sample was free of the normally present rare-earth (RE) eutectic phase and simultaneously free of Widmanstatten precipitate (RE Fe3). A bar with (111) and (11BAR0) faces perpendicular to the [112BAR] growth direction was examined. Also, a [111BAR] slab was cut from the boule. This slab was studied along the [111BAR] and [110BAR] directions with prestress applied along the [111BAR]. This is the first report of the effects of applying prestress and magnetic fields in a direction not collinear with the [112BAR] growth direction. From magnetization (M) and magnetostriction (lambda) measurements as a function of field, prestress, and temperature, we determined the hysteresis and saturation parameters. These measurments do not indicate the [11BAR0] lambda and M behaviors found previously for RE-rich Terfenol-D. Domain observations with differential phase contrast and x-ray topography have shown different orientations in the twin and parent sections of the [111BAR] specimen. The observed structures can be interpreted as arising from domains with magnetization components normal to the surface. The domain observations on the (111) and (11BAR0) bar faces and on the [111BAR] slab correlate with each other with respect to orientations and domain interpretations. C1 EDGE TECHNOL,AMES,IA 50011. UNIV SALFORD,DEPT PURE & APPL PHYS,SALFORD M5 4WT,LANCS,ENGLAND. RP TETER, JP (reprint author), USN,SURFACE WARFARE CTR,10901 NEW HAMPSHIRE AVE,SILVER SPRING,MD 20903, USA. NR 6 TC 14 Z9 14 U1 2 U2 7 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0021-8979 J9 J APPL PHYS JI J. Appl. Phys. PD APR 15 PY 1991 VL 69 IS 8 BP 5768 EP 5770 DI 10.1063/1.348938 PN 2B PG 3 WC Physics, Applied SC Physics GA FL735 UT WOS:A1991FL73500164 ER PT J AU CLARK, AE TETER, JP WUNFOGLE, M AF CLARK, AE TETER, JP WUNFOGLE, M TI ANISOTROPY COMPENSATION AND MAGNETOSTRICTION IN TBXDY1-X(FE1-YTY)1.9 (T=CO,MN) SO JOURNAL OF APPLIED PHYSICS LA English DT Article; Proceedings Paper CT 35TH ANNUAL CONF ON MAGNETISM AND MAGNETIC MATERIALS CY OCT 29-NOV 01, 1990 CL SAN DIEGO, CA SP AMER INST PHYS, IEEE, MAGNET SOC, AMER INST MIN MET & PETR ENGINEERS, MET SOC, USN, OFF NAVAL RES, AMER SOC TESTING & MAT, AMER PHYS SOC, AMER CERAM SOC ID TB.27DY.73FE2 AB From magnetization (M) and magnetostriction (lambda) measurements as a function of magnetic field and stress, the temperatures of anisotropy compensation, T(m), for technologically important Tb(x)Dy1-x(Fe(1-y)T(y)1.9 [T = Co, Mn (0.3 less-than-or-equal-to x less-than-or-equal-to 0.5) (0 less-than-or-equal-to y less-than-or-equal-to 0.3)] were determined. Measurements of M and lambda encompassing T(m) were made under compressive stresses from 8.8 to 36 MPa and for temperatures from - 196 to + 130-degrees-C. In agreement with earlier measurements, T(m) decreases with increasing Tb. Substitution of Mn for Fe for fixed x also decreases T(m). In contrast with these observations is the increase of the anisotropy compensation temperature with the replacement of Fe by small amounts of Co. In the cases of both (1) increasing Tb content and (2) increasing Co content, the Curie temperature T(C) increases, yielding, in general, a higher magnetic moment and saturation magnetostriction of these alloys. Thus, compensation at a given temperature may be obtained in an improved class of Laves phase compounds, R(x)(1)R1-x(2)(Fe(1-y)Co(y))2, where rare earths R(1) and R(2) are, for example, Tb and Dy. RP CLARK, AE (reprint author), USN,SURFACE WARFARE CTR,10901 NEW HAMPSHIRE AVE,SILVER SPRING,MD 20903, USA. NR 8 TC 78 Z9 81 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 APR 15 PY 1991 VL 69 IS 8 BP 5771 EP 5773 DI 10.1063/1.347871 PN 2B PG 3 WC Physics, Applied SC Physics GA FL735 UT WOS:A1991FL73500165 ER PT J AU KOON, NC PRINZ, GA VOLKENING, FA DAS, BN AYLESWORTH, K AF KOON, NC PRINZ, GA VOLKENING, FA DAS, BN AYLESWORTH, K TI ULTRATHIN MAGNETIC-FILMS OF FE/AG(100) - AN APPROXIMATE REALIZATION OF A 2-D HEISENBERG-FERROMAGNET SO JOURNAL OF APPLIED PHYSICS LA English DT Meeting Abstract RP KOON, NC (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 3 TC 3 Z9 3 U1 1 U2 2 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0021-8979 J9 J APPL PHYS JI J. Appl. Phys. PD APR 15 PY 1991 VL 69 IS 8 BP 5967 EP 5967 DI 10.1063/1.347833 PN 2B PG 1 WC Physics, Applied SC Physics GA FL735 UT WOS:A1991FL73500236 ER PT J AU JONKER, BT LIU, X CHOU, WC PETROU, A WARNOCK, J KREBS, JJ PRINZ, GA AF JONKER, BT LIU, X CHOU, WC PETROU, A WARNOCK, J KREBS, JJ PRINZ, GA TI SPIN SEPARATION IN DILUTED MAGNETIC SEMICONDUCTOR QUANTUM-WELL SYSTEMS SO JOURNAL OF APPLIED PHYSICS LA English DT Article; Proceedings Paper CT 35TH ANNUAL CONF ON MAGNETISM AND MAGNETIC MATERIALS CY OCT 29-NOV 01, 1990 CL SAN DIEGO, CA SP AMER INST PHYS, IEEE, MAGNET SOC, AMER INST MIN MET & PETR ENGINEERS, MET SOC, USN, OFF NAVAL RES, AMER SOC TESTING & MAT, AMER PHYS SOC, AMER CERAM SOC ID EPITAXIAL-GROWTH; ZN1-XFEXSE; FILMS AB Heterostructures containing diluted magnetic semiconductor (DMS) layers offer the possibility of magnetically tuning the heterojunction band alignment due to the extraordinarily large spin-splitting of the DMS bands (large effective g-factor). This field-dependent band alignment has significant consequences for spin-dependent carrier confinement as evidenced in magnetooptic or magneto-transport experiments. We have examined two wide-gap DMS quantum well systems in which the band alignment is dominated by the DMS spin-splitting rather than by the more commonly observed effects of differences in bandgap, natural band offset, and strain. Quantum well structures with (Zn,Fe)Se or (Zn,Mn)Se barriers and ZnSe wells have been grown to investigate magnetically tuned, spin-dependent quantum confinement. In these systems, the band offset appears almost entirely in the conduction band, so that the electrons are confined to the ZnSe wells. However, the hole confinement is continuously tunable by an external magnetic field applied normal to the layer plane, since the valence band spin-splitting is approximately an order of magnitude larger at modest fields (1 T) than the zero field VB offset. This produces a field-induced spin dependent type I/type II band alignment and a consequent spatial spin separation of the holes. The quantum well structure exhibits a type I "straddling" alignment for the m(j) = + 3/2 level, with the spin "up" holes localized in the ZnSe wells, and a type II "staggered" alignment for the m(j) = - 3/2 level in which the spin "down" holes are localized in the barriers. The observed exciton splittings, intensities and temperature dependence are consistent with this model. In the Zn0.91Mn0.09Se/ZnSe system, a second bound state is observed in the conduction band in the sigma } polarization in magnetoreflectivity measurements. A quantitative fit to the data yields a value of approximately 1 meV for the zero field valence band offset. These systems represent the first DMS-based heterostructures in which such field-dependent confinement has been observed. C1 SUNY BUFFALO,CTR ELECTR & ELECTROOPT MAT,BUFFALO,NY 14260. SUNY BUFFALO,DEPT PHYS & ASTRON,BUFFALO,NY 14260. IBM CORP,THOMAS J WATSON RES CTR,DIV RES,YORKTOWN HTS,NY 10598. RP JONKER, BT (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 13 TC 38 Z9 38 U1 1 U2 6 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0021-8979 J9 J APPL PHYS JI J. Appl. Phys. PD APR 15 PY 1991 VL 69 IS 8 BP 6097 EP 6102 DI 10.1063/1.347779 PN 2B PG 6 WC Physics, Applied SC Physics GA FL735 UT WOS:A1991FL73500285 ER PT J AU KARANIKAS, JM SOORYAKUMAR, R PRINZ, GA JONKER, BT AF KARANIKAS, JM SOORYAKUMAR, R PRINZ, GA JONKER, BT TI THERMAL MAGNONS IN BCC COBALT-ITINERANCY AND EXCHANGE STIFFNESS SO JOURNAL OF APPLIED PHYSICS LA English DT Article; Proceedings Paper CT 35TH ANNUAL CONF ON MAGNETISM AND MAGNETIC MATERIALS CY OCT 29-NOV 01, 1990 CL SAN DIEGO, CA SP AMER INST PHYS, IEEE, MAGNET SOC, AMER INST MIN MET & PETR ENGINEERS, MET SOC, USN, OFF NAVAL RES, AMER SOC TESTING & MAT, AMER PHYS SOC, AMER CERAM SOC ID BRILLOUIN-SCATTERING; SPIN-WAVES; EPITAXIAL-GROWTH; FILMS; CO; GAAS; ANISOTROPY; LIGHT; IRON; FE AB The stable hcp and the metastable bcc phases of cobalt have almost identical nearest-neighbor distances, but substantially different coordination numbers z (z(bcc) = 8, z(hcp) = 12). While z is central to magnetic behavior in insulating systems, these distinctive structural features of cobalt offer an opportunity to address the role of coordination in strong itinerant ferromagnets. We report a room-temperature Brillouin scattering study of surface and bulk spin waves in molecular-beam-epitaxially grown thin films of bcc cobalt. Fitting expressions for the surface and bulk magnon dispersion to the measured frequency shifts versus applied magnetic field provides values for the gyromagnetic ratio, saturation magnetization M, and the exchange stiffness constant D for bcc cobalt. Our results reveal that M is about 10% lower than that of the hcp phase, while D scales with z, a characteristic of an insulating ferromagnet. C1 USN,RES LAB,WASHINGTON,DC 20375. RP KARANIKAS, JM (reprint author), OHIO STATE UNIV,DEPT PHYS,COLUMBUS,OH 43210, USA. NR 28 TC 27 Z9 27 U1 2 U2 7 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0021-8979 J9 J APPL PHYS JI J. Appl. Phys. PD APR 15 PY 1991 VL 69 IS 8 BP 6120 EP 6125 DI 10.1063/1.348778 PN 2B PG 6 WC Physics, Applied SC Physics GA FL735 UT WOS:A1991FL73500293 ER PT J AU SITZMANN, ME AF SITZMANN, ME TI N-PENTAFLUOROSULFANYL-N-NITRO CARBAMATES SO JOURNAL OF FLUORINE CHEMISTRY LA English DT Article AB Unlike N-alkyl carbamates, N-pentafluorosulfanyl carbamates (SF5NHCO2R) did not readily undergo nitration to provide the N-NO2 derivatives. Although trifluoroacetyl nitrate did provide nitration, work-up yielded a mixture of SF5N(NO2)CO2R and starting material. The ratio of nitration product to starting material was not changed after prolonged reaction times and the N-NO2 product was stable to the work-up conditions. A rationale for these results as well as the effect of varying R is discussed. RP SITZMANN, ME (reprint author), USN,CTR SURFACE WARFARE,10901 NEW HAMPSHIRE AVE,SILVER SPRING,MD 20903, USA. NR 9 TC 12 Z9 12 U1 0 U2 2 PU ELSEVIER SCIENCE SA LAUSANNE PI LAUSANNE 1 PA PO BOX 564, 1001 LAUSANNE 1, SWITZERLAND SN 0022-1139 J9 J FLUORINE CHEM JI J. Fluor. Chem. PD APR 15 PY 1991 VL 52 IS 2 BP 195 EP 207 DI 10.1016/S0022-1139(00)80135-9 PG 13 WC Chemistry, Inorganic & Nuclear; Chemistry, Organic SC Chemistry GA FR447 UT WOS:A1991FR44700009 ER PT J AU LUKAS, R FIRING, E HACKER, P RICHARDSON, PL COLLINS, CA FINE, R GAMMON, R AF LUKAS, R FIRING, E HACKER, P RICHARDSON, PL COLLINS, CA FINE, R GAMMON, R TI OBSERVATIONS OF THE MINDANAO CURRENT DURING THE WESTERN EQUATORIAL PACIFIC-OCEAN CIRCULATION STUDY SO JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS LA English DT Article ID NORTH PACIFIC; INDIAN-OCEAN; FLOW AB The Western Equatorial Pacific Ocean Circulation Study (WEPOCS) III expedition was conducted from June 18 through July 31, 1988, in the far western equatorial Pacific Ocean to observe the low-latitude western boundary circulation there, with emphasis on the Mindanao Current. This survey provides the first quasi-synoptic set of current measurements which resolve all of the important upper-ocean currents in the western tropical Pacific. Observations were made of the temperature, salinity, dissolved oxygen, and current profiles with depth; of water mass properties including transient tracers; and of evolving surface flows with a dense array of Lagrangian drifters. This paper provides a summary of the measurements and a preliminary description of the results. The Mindanao Current was found to be a narrow, southward-flowing current along the eastward side of the southern Philippine Islands, extending from 14-degrees-N to the south end of Mindanao near 6-degrees-N, where it then separates from the coast and penetrates into the Celebes Sea. The current strengthens to the south and is narrowest at 10-degrees-N. Direct current measurements reveal transports in the upper 300 m increasing from 13 Sv to 33 Sv (1 Sverdrup = 1 x 10(6) m3 s-1) between 10-degrees-N and 5.5-degrees-N. A portion of the Mindanao Current appears to recurve cyclonically in the Celebes Sea to feed the North Equatorial Countercurrent, merging with waters from the South Equatorial Current and the New Guinea Coastal Undercurrent. Another portion of the Mindanao Current appears to flow directly into the NECC without entering the Celebes Sea. The turning of the currents into the NECC is associated with the Mindanao and Halmahera eddies. C1 UNIV MIAMI,ROSENSTIEL SCH MARINE & ATMOSPHER SCI,MIAMI,FL 33149. USN,POSTGRAD SCH,DEPT OCEANOG,MONTEREY,CA 93943. UNIV WASHINGTON,DEPT ATMOSPHER SCI,SEATTLE,WA 98195. TEXAS A&M UNIV SYST,DEPT OCEANOG,COLLEGE STN,TX 77843. WOODS HOLE OCEANOG INST,DEPT PHYS OCEANOG,WOODS HOLE,MA 02543. RP LUKAS, R (reprint author), UNIV HAWAII,DEPT OCEANOG,1000 POPE RD,HONOLULU,HI 96822, USA. RI Lukas, Roger/B-3715-2009 NR 42 TC 166 Z9 178 U1 2 U2 14 PU AMER GEOPHYSICAL UNION PI WASHINGTON PA 2000 FLORIDA AVE NW, WASHINGTON, DC 20009 SN 0148-0227 J9 J GEOPHYS RES-OCEANS JI J. Geophys. Res.-Oceans PD APR 15 PY 1991 VL 96 IS C4 BP 7089 EP 7104 DI 10.1029/91JC00062 PG 16 WC Oceanography SC Oceanography GA FH461 UT WOS:A1991FH46100012 ER PT J AU SHEMER, L DODD, N THORNTON, EB AF SHEMER, L DODD, N THORNTON, EB TI SLOW-TIME MODULATION OF FINITE-DEPTH NONLINEAR WATER-WAVES - RELATION TO LONGSHORE-CURRENT OSCILLATIONS SO JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS LA English DT Article ID GRAVITY-WAVES; EVOLUTION; INSTABILITIES; TRAIN AB Nonlinear dynamics of steep waves in water of finite depth are analyzed. The most unstable Benjamin-Feir sidebands are found for a number of values of carrier wave steepness and water depth. The long-time evolution of a three-wave system, consisting of the carrier and the two most unstable sidebands, is then studied. Such a wave system undergoes periodic recurrence. It is shown that the slow-time modulation leads to a corresponding periodic variation in the radiation stress when the propagation directions of the sidebands differ from that of the carrier. The variation of the radiation stress, in turn, results in slow-time modulation of longshore current. C1 TEL AVIV UNIV,FAC ENGN,DEPT FLUID MECH,IL-69978 TEL AVIV,ISRAEL. RP SHEMER, L (reprint author), USN,POSTGRAD SCH,DEPT OCEANOG,MONTEREY,CA 93943, USA. RI Shemer, Lev/B-1143-2008 NR 28 TC 7 Z9 8 U1 0 U2 0 PU AMER GEOPHYSICAL UNION PI WASHINGTON PA 2000 FLORIDA AVE NW, WASHINGTON, DC 20009 SN 0148-0227 J9 J GEOPHYS RES-OCEANS JI J. Geophys. Res.-Oceans PD APR 15 PY 1991 VL 96 IS C4 BP 7105 EP 7113 DI 10.1029/91JC00061 PG 9 WC Oceanography SC Oceanography GA FH461 UT WOS:A1991FH46100013 ER PT J AU MARMORINO, GO TRUMP, CL AF MARMORINO, GO TRUMP, CL TI TURBULENT MIXING INDUCED BY UPGOING NEAR-INERTIAL WAVES IN THE SEASONAL THERMOCLINE OF THE NORWEGIAN SEA SO JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS LA English DT Article ID SARGASSO SEA; VARIABILITY; DISSIPATION; BREAKING; SHEAR; FRONT AB Acoustic Doppler current profiler and towed thermistor chain measurements made in the seasonal thermocline in the Norwegian Sea are examined for evidence that near-inertial shear leads to small-scale "turbulent mixing" (as inferred from meter-scale temperature fluctuations). For the almost-equal-to 1 day of data examined here, spatial variability in shear is dominated by near-inertial waves having upward energy propagation, almost-equal-to 30-m vertical wavelength, and 5- to 10-km horizontal extent (almost-equal-to 20-km wavelength). Repeated samples of one of these waves had high Froude number and enhanced small-scale variability dominated by almost-equal-to 20-m-long waveforms which we conjecture are Kelvin-Helmholtz instabilities arising from the near-inertial shear. RP MARMORINO, GO (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 24 TC 5 Z9 5 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 APR 15 PY 1991 VL 96 IS C4 BP 7137 EP 7143 DI 10.1029/91JC00084 PG 7 WC Oceanography SC Oceanography GA FH461 UT WOS:A1991FH46100016 ER PT J AU MAY, DA HAWKINS, JD AF MAY, DA HAWKINS, JD TI IMPACT OF THE GEOSAT ALTIMETER WET TROPOSPHERIC RANGE CORRECTION IN THE GREENLAND-ICELAND-NORWEGIAN SEA SO JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS LA English DT Article AB Atmospheric water vapor data derived from the special sensor microwave imager (SSM/I) are used to make time-coincident wet troposheric range corrections to Geosat altimeter data in the Greenland-Iceland-Norwegian (GIN) Sea. The SSM/I sensor is onboard a polar orbiting Defense Meteorological Satellite Program platform and provides water vapor data at 25-km spatial resolution and an accuracy of 0.24 g cm-2. Water vapor height corrections were calculated and analyzed along all Geosat tracks crossing the area of interest in July and September 1987 and January and March 1988. Results indicate that the horizontal spatial variations in the altimeter height corrections can sometimes equal or exceed the magnitude (10-20 cm/100 km) of true GIN Sea sea surface height gradients, especially in the summer and autumn seasons. SSM/I and Geosat data must be closely matched in time, due to the potential rapid movement of atmospheric systems through this region (35-40 km h-1). The water vapor data must be timely enough to adequately describe atmospheric conditions at the time of the altimeter pass, or significantly false signals may be introduced into the sea surface height data. Substantial differences in water vapor gradients were observed in SSM/I data sets 12 hours apart. Because of this, it is suggested that future satellite altimeter platforms include a nadir-viewing radiometer to provide time-coincident atmospheric water vapor data. RP MAY, DA (reprint author), USN,OCEANOG & ATMOSPHER RES LAB,OCEAN SENSING & PREDICT DIV,STENNIS SPACE CTR,MS 39529, USA. NR 19 TC 2 Z9 2 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 APR 15 PY 1991 VL 96 IS C4 BP 7237 EP 7247 DI 10.1029/91JC00150 PG 11 WC Oceanography SC Oceanography GA FH461 UT WOS:A1991FH46100023 ER PT J AU KENNY, JJ STALL, AM SIECKMANN, DG LAMERS, MC FINKELMAN, FD FINCH, L LONGO, DL AF KENNY, JJ STALL, AM SIECKMANN, DG LAMERS, MC FINKELMAN, FD FINCH, L LONGO, DL TI RECEPTOR-MEDIATED ELIMINATION OF PHOSPHOCHOLINE-SPECIFIC B-CELLS IN X-LINKED IMMUNE-DEFICIENT MICE SO JOURNAL OF IMMUNOLOGY LA English DT Article ID TRANSGENIC MOUSE LINE; PROTEUS-MORGANII; LYMPHOCYTES-B; KAPPA-GENES; MU-GENES; ANTIBODIES; PHOSPHORYLCHOLINE; EXPRESSION; IMMUNODEFICIENCY; AUTOIMMUNE AB The combined expression of the M167-mu/kappa antiphosphocholine (PC) transgenes with the x-linked immunodeficiency gene, xid, results in an almost total failure to develop B cells in the peripheral lymphoid organs of such mice. Although there is no significant difference between the normal transgene positive (TG+) female offspring and the immunodeficient TG+ xid males with respect to the number of B220+ pre-B cells and IgM+B220+ B cells that develop in their bone marrow, the hemizygous xid males have 85% fewer B cells in their spleens than the phenotypically normal heterozygous F1 females. In xid M167-mu-transgenic mice, PC-specific B cells also fail to develop in the spleen; however, numberous B cells bearing the mu-a+V(H)1+-transgene product associated with endogenous kappa-L chains that do not give rise PC-specific antibodies are present. In the phenotypically normal TG+ (B6.CBA/N X-mu-243-4)F1 female mice, PC-specific B cells represent almost 10% of the total B cell population, and these B cells express an M167-Id that has been produced by association of the V(H)1 transgene product with an endogenous V-kappa-24 L chain. B cells expressing the normally dominant T15-Id are not detectable in the spleens of these M167 mu-transgenic mice. Furthermore, M167-Id+B cells are present at a fivefold lower level in the bone marrow of mu-TG+ normal mice than in their spleens. These data suggest that the PC-specific B cells that develop in TG+ xid mice are either clonally deleted via some "IgR-directed" mechanism or they fail to receive the appropriate signals to exit the bone marrow or to enter the peripheral lymphoid tissues. This hypothesis is supported by the finding that TNP-specific B cells develop normally and do not undergo clonal deletion in xid mice carrying the Sp6-mu/kappa-anti-TNP transgenes. C1 STANFORD UNIV,DEPT GENET,STANFORD,CA 94305. USN,MED RES INST,BETHESDA,MD 20814. MAX PLANCK INST IMMUNBIOL,W-7800 FREIBURG,GERMANY. UNIFORMED SERV UNIV HLTH SCI,DEPT MED,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,DYNCORP,PROGRAM RESOURCES INC,BOX B,FREDERICK,MD 21702, USA. FU NCI NIH HHS [N01-CO-23910]; NIAID NIH HHS [AI-24672, AI-21328] NR 38 TC 25 Z9 25 U1 0 U2 0 PU AMER ASSOC IMMUNOLOGISTS PI BETHESDA PA 9650 ROCKVILLE PIKE, BETHESDA, MD 20814 SN 0022-1767 J9 J IMMUNOL JI J. Immunol. PD APR 15 PY 1991 VL 146 IS 8 BP 2568 EP 2577 PG 10 WC Immunology SC Immunology GA FG729 UT WOS:A1991FG72900012 PM 1901880 ER PT J AU GROSSMAN, Y COLTON, JS GILMAN, SC AF GROSSMAN, Y COLTON, JS GILMAN, SC TI INTERACTION OF CA-CHANNEL BLOCKERS AND HIGH-PRESSURE AT THE CRUSTACEAN NEUROMUSCULAR-JUNCTION SO NEUROSCIENCE LETTERS LA English DT Article DE HIGH PRESSURE; HYPERBARIC CONDITION; CA-CHANNEL; JUNCTIONAL CURRENT; TRANSMITTER RELEASE; CRUSTACEA ID HYDROSTATIC-PRESSURE; CALCIUM CHANNELS; NERVE-TERMINALS; TRANSMITTER RELEASE; CRAYFISH MUSCLE; FACILITATION; SYNAPTOSOMES; CURRENTS AB Exposure to high pressure causes a significant depression of synaptic transmission. We examined the effects of various Ca-channel blockers and their interaction with high pressure on excitatory neuromuscular junction currents (EJCs) of lobster abdominal muscles. Reduced [Ca2+]o to half of normal concentration or exposure to 40-60-mu-M CdCl2, 10-20-mu-M NiCl2 and 1-mu-M omega-conotoxin decreased EJCs by 50%. Nifedipine, Nitrendipine and Bay K-8644 were ineffective. Either Ca-blockers or reduced [Ca2+]o, enhanced EJC suppression exerted by high pressure. The data suggest that high pressure primarily affects Ca2+ inflow at the presynaptic terminals through N-type voltage-gated Ca-channel. C1 USN,MED RES INST,DEPT DIVING MED,BETHESDA,MD 20814. RP GROSSMAN, Y (reprint author), BEN GURION UNIV NEGEV,FAC HLTH SCI,COROB CTR MED RES,DEPT PHYSIOL,IL-84105 BEER SHEVA,ISRAEL. NR 21 TC 18 Z9 18 U1 0 U2 3 PU ELSEVIER SCI IRELAND LTD PI CLARE PA CUSTOMER RELATIONS MANAGER, BAY 15, SHANNON INDUSTRIAL ESTATE CO, CLARE, IRELAND SN 0304-3940 J9 NEUROSCI LETT JI Neurosci. Lett. PD APR 15 PY 1991 VL 125 IS 1 BP 53 EP 56 DI 10.1016/0304-3940(91)90129-H PG 4 WC Neurosciences SC Neurosciences & Neurology GA FL376 UT WOS:A1991FL37600016 PM 1857559 ER PT J AU DULING, IN AF DULING, IN TI ALL-FIBER RING SOLITON LASER MODE-LOCKED WITH A NONLINEAR MIRROR SO OPTICS LETTERS LA English DT Article AB An amplifying nonlinear-optical fiber loop mirror is used as the gain element in an all-fiber ring laser. The resulting double-loop structure resembles a figure eight. The output of the amplifying nonlinear-optical fiber loop mirror is fed back to the input through an optical isolator to ensure unidirectional operation. The laser produces 2-ps transform-limited pulses. The pulse energy corresponds to that of the fundamental soliton in the fiber used. RP DULING, IN (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 12 TC 202 Z9 205 U1 6 U2 40 PU OPTICAL SOC AMER PI WASHINGTON PA 2010 MASSACHUSETTS AVE NW, WASHINGTON, DC 20036 SN 0146-9592 J9 OPT LETT JI Opt. Lett. PD APR 15 PY 1991 VL 16 IS 8 BP 539 EP 541 PG 3 WC Optics SC Optics GA FG121 UT WOS:A1991FG12100001 ER PT J AU SINGH, DJ PAPACONSTANTOPOULOS, DA KRAKAUER, H KLEIN, BM PICKETT, WE AF SINGH, DJ PAPACONSTANTOPOULOS, DA KRAKAUER, H KLEIN, BM PICKETT, WE TI ELECTRONIC-STRUCTURE OF DOPED SR2VO4 SO PHYSICA C LA English DT Article ID PLANE-WAVE METHOD; SUPERCONDUCTIVITY; COPPER AB We report band structure calculations for the compound Sr2VO4. Calculations were also performed for the hypothetical compound, Tl2VO4, in the K2NiF4 structure in order to determine the valence of substitutional Tl in Sr2VO4. For pure Sr2VO4 we find a Stoner criterion, N(E(F))I(E(F)), of 2.21 implying a magnetic instability. This is consistent with the antiferromagnetic state found experimentally. Rigid band calculations of the Stoner criterion indicate that the magnetic instability of Sr2VO4 may be removed by doping with either monovalent or trivalent ions on the Sr sites. However, much smaller concentrations are required if monovalent dopants are used. The calculations for Tl2VO4 show that substitutional Tl is effectively monovalent on the Sr site and thus provides an alternative to doping with group I elements. We have evaluate the electron-phonon interaction parameters eta and find that they have much larger values than in La2CuO4. C1 COLL WILLIAM & MARY,DEPT PHYS,WILLIAMSBURG,VA 23185. RP SINGH, DJ (reprint author), USN,RES LAB,COMPLEX SYST THEORY BRANCH,WASHINGTON,DC 20375, USA. RI Singh, David/I-2416-2012; OI Krakauer, Henry/0000-0003-2517-0957 NR 21 TC 8 Z9 8 U1 2 U2 11 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0921-4534 J9 PHYSICA C JI Physica C PD APR 15 PY 1991 VL 175 IS 3-4 BP 329 EP 334 DI 10.1016/0921-4534(91)90605-X PG 6 WC Physics, Applied SC Physics GA FJ347 UT WOS:A1991FJ34700014 ER PT J AU MEHL, MJ BOYER, LL AF MEHL, MJ BOYER, LL TI CALCULATION OF ENERGY BARRIERS FOR PHYSICALLY ALLOWED LATTICE-INVARIANT STRAINS IN ALUMINUM AND IRIDIUM SO PHYSICAL REVIEW B LA English DT Article ID ELASTIC-CONSTANTS; INSTABILITY; KNBO3 AB Total-energy calculations using the full-potential linearized augmented-plane-wave method are employed to determine the energy barrier for physically allowed lattice-invariant strains in iridium (which has a high melting point) and aluminum (for which the melting point is relatively low). The barrier heights are found to correspond qualitatively with their corresponding melting temperatures, and the calculated shear elastic moduli agree favorably with experimental values. RP USN, RES LAB, WASHINGTON, DC 20375 USA. RI Mehl, Michael/H-8814-2016 NR 27 TC 24 Z9 24 U1 0 U2 2 PU AMER PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1098-0121 EI 1550-235X J9 PHYS REV B JI Phys. Rev. B PD APR 15 PY 1991 VL 43 IS 12 BP 9498 EP 9502 DI 10.1103/PhysRevB.43.9498 PG 5 WC Physics, Condensed Matter SC Physics GA FK191 UT WOS:A1991FK19100013 ER PT J AU TRITT, TM SKOVE, MJ EHRLICH, AC AF TRITT, TM SKOVE, MJ EHRLICH, AC TI CHANGE IN YOUNG MODULUS AT LOW-FREQUENCY UPON CHARGE-DENSITY-WAVE DEPINNING IN TAS3 SO PHYSICAL REVIEW B LA English DT Note ID ELASTIC PROPERTIES; ORTHORHOMBIC TAS3; ELECTRIC-FIELDS; CONDUCTORS; DEPENDENCE; STRESS; NBSE3; TRANSITION; ANOMALIES; MODEL AB We have measured statically (at frequency omega < 0.1 Hz) the stress-strain (sigma-epsilon) relationship of the charge-density-wave (CDW) material TaS3, while simultaneously monitoring the four-probe resistance. We found that an electric field E up to 2-3 times larger than the threshold field E(T) for CDW motion had at most a small effect (0 < DELTA-epsilon/epsilon < 0.2%) on the strain at constant stress (DELTA-epsilon/epsilon almost-equal-to -DELTA-Y/Y at constant sigma), in contrast to vibrating-reed determinations of DELTA-Y/Y. For E > 3 E(T) we observed a change in the strain, i.e., the sample length, which was linear in the power, this was suggestive of sample heating. We discuss our results in relation to the recently discovered frequency dependence of Y [X. D. Xiang and J. W. Brill, Phys. Rev. Lett. 63, 1853 (1990)] and the recent phase-relaxation model of elastic softening [G. Mozurkewich, Phys. Rev. B 42, 11 183 (1990)]. C1 CLEMSON UNIV,DEPT PHYS,CLEMSON,SC 29634. RP TRITT, TM (reprint author), USN,RES LAB,MAT PHYS BRANCH,CODE 6341,WASHINGTON,DC 20375, USA. NR 35 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 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD APR 15 PY 1991 VL 43 IS 12 BP 9972 EP 9975 DI 10.1103/PhysRevB.43.9972 PG 4 WC Physics, Condensed Matter SC Physics GA FK191 UT WOS:A1991FK19100076 ER PT J AU SCHMITT, HA MUFTI, A AF SCHMITT, HA MUFTI, A TI 2-LEVEL JAYNES-CUMMINGS HAMILTONIAN AS A SUPERSYMMETRIC QUANTUM-MECHANICAL SYSTEM SO PHYSICAL REVIEW D LA English DT Note AB Using a realization of the noncompact orthosymplectic superalgebra Osp(2/2,R), the two-level Jaynes-Cummings Hamiltonian is shown to be a supersymmetric quantum-mechanical system in the sense of Witten. The existence of the supersymmetry is shown to place a restriction on the physical parameters of the Hamiltonian. C1 UNIV ARIZONA,ARIZONA MAT LAB,TUCSON,AZ 85721. UNIV ARIZONA,DEPT PHYS,TUCSON,AZ 85721. RP SCHMITT, HA (reprint author), USN,WARFARE ASSESSMENT CTR,POMONA,CA 91769, USA. NR 8 TC 6 Z9 6 U1 0 U2 2 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0556-2821 J9 PHYS REV D JI Phys. Rev. D PD APR 15 PY 1991 VL 43 IS 8 BP 2743 EP 2744 DI 10.1103/PhysRevD.43.2743 PG 2 WC Astronomy & Astrophysics; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA FH288 UT WOS:A1991FH28800038 ER PT J AU SOMMERER, JC DITTO, WL GREBOGI, C OTT, E SPANO, ML AF SOMMERER, JC DITTO, WL GREBOGI, C OTT, E SPANO, ML TI EXPERIMENTAL CONFIRMATION OF THE SCALING THEORY FOR NOISE-INDUCED CRISES SO PHYSICAL REVIEW LETTERS LA English DT Article ID INDUCED INTERMITTENCY; CHAOTIC ATTRACTORS; CRITICAL EXPONENT; TRANSIENT CHAOS; OSCILLATOR AB We investigate experimentally the scaling of the average time tau between intermittent, noise-induced bursts for a chaotic mechanical system near a crisis. The system studied is a periodically driven (frequency f) magnetoelastic ribbon. Theory predicts that for deterministic crises where tau-scales as tau approximately (f-f(c))-gamma (f < f(c), f = f(c) at crisis), the characteristic time between noise-induced bursts (f greater-than-or-equal-to f(c)) should scale as tau approximately sigma-gamma-g((f-f(c))/sigma), where sigma is the noise strength and gamma is the same in both cases. We determine gamma for the low-noise ("deterministic") system, then add noise and observe that the scaling for tau is as predicted. C1 APPL PHYS LAB,LAUREL,MD 20723. USN,CTR SURFACE WARFARE,SILVER SPRING,MD 20903. RP SOMMERER, JC (reprint author), UNIV MARYLAND,COLLEGE PK,MD 20742, USA. RI Spano, Mark/B-6883-2011; O, E/F-1630-2015; OI Ditto, William/0000-0002-7416-8012 NR 24 TC 57 Z9 57 U1 0 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 APR 15 PY 1991 VL 66 IS 15 BP 1947 EP 1950 DI 10.1103/PhysRevLett.66.1947 PG 4 WC Physics, Multidisciplinary SC Physics GA FG033 UT WOS:A1991FG03300001 ER PT J AU SINGH, A MARKOWITZ, M AF SINGH, A MARKOWITZ, M TI SELF-ASSEMBLING BEHAVIOR OF NEGATIVELY CHARGED DIACETYLENIC PHOSPHOLIPIDS SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 USN,RES LAB,CTR BIOMOLEC SCI & ENGN,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 APR 14 PY 1991 VL 201 BP 2 EP MACR PN 2 PG 0 WC Chemistry, Multidisciplinary SC Chemistry GA FG894 UT WOS:A1991FG89401423 ER PT J AU SCHNUR, JM AF SCHNUR, JM TI POTENTIAL APPLICATION OF SELF ASSEMBLED LIPID TUBULES SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 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 APR 14 PY 1991 VL 201 BP 22 EP MACR PN 2 PG 0 WC Chemistry, Multidisciplinary SC Chemistry GA FG894 UT WOS:A1991FG89401443 ER PT J AU LAVELL, WT AF LAVELL, WT TI STUDY OF PHOTOENOLIZATION IN INDOLES 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 APR 14 PY 1991 VL 201 BP 26 EP ORGN PN 2 PG 0 WC Chemistry, Multidisciplinary SC Chemistry GA FG894 UT WOS:A1991FG89400129 ER PT J AU LIGLER, FS WEMHOFF, G KUSTERBECK, AW OGERT, R CHARLES, P BREDEHORST, R AF LIGLER, FS WEMHOFF, G KUSTERBECK, AW OGERT, R CHARLES, P BREDEHORST, R TI DRUG DETECTION USING THE FLOW IMMUNOSENSOR SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 USN,RES LAB,WASHINGTON,DC 20375. GEOCENTERS INC,WASHINGTON,DC. GEORGETOWN UNIV,SCH MED,WASHINGTON,DC 20057. 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 APR 14 PY 1991 VL 201 BP 33 EP AGRO PN 1 PG 0 WC Chemistry, Multidisciplinary SC Chemistry GA FG893 UT WOS:A1991FG89300113 ER PT J AU MCDONNELL, ME NEMEROFF, NH BUCKLEY, L AF MCDONNELL, ME NEMEROFF, NH BUCKLEY, L TI AN EFFICIENT SYNTHESIS OF A NOVEL 3,4-DISUBSTITUTED PYRROLE DERIVATIVE - METHYL 4-(1-FERROCENYL) PYRROLE-3-CARBOXYLATE SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 PHILADELPHIA COLL TEXT & SCI,DEPT CHEM,PHILADELPHIA,PA 19144. USN,CTR AIR DEV,WARMINSTER,PA 18974. 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 APR 14 PY 1991 VL 201 BP 34 EP ORGN PN 2 PG 0 WC Chemistry, Multidisciplinary SC Chemistry GA FG894 UT WOS:A1991FG89400137 ER PT J AU SINGH, A TSAO, L MARKOWITZ, M GABER, BP AF SINGH, A TSAO, L MARKOWITZ, M GABER, BP TI METAL-ION INDUCED PHASE-CHANGES IN SELF-ASSEMBLED MEMBRANES - A GENERAL SCHEME FOR METAL DETECTION SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 USN,RES LAB,CTR BIOMOLEC SCI & ENGN,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 APR 14 PY 1991 VL 201 BP 39 EP BIOT PN 1 PG 0 WC Chemistry, Multidisciplinary SC Chemistry GA FG893 UT WOS:A1991FG89300454 ER PT J AU FARE, TL STENGER, DA CRIBBS, DH RUSIN, KM BEY, PP SILVESTRE, CG PALMER, CA AF FARE, TL STENGER, DA CRIBBS, DH RUSIN, KM BEY, PP SILVESTRE, CG PALMER, CA TI ION CHANNEL PROTEIN-LIPID ELECTRODES FOR CHEMICAL TRANSDUCTION SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 GEOCENTERS INC,FT WASHINGTON,MD 20744. ST MARYS COLL,ST MARYS CITY,MD 20686. 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 APR 14 PY 1991 VL 201 BP 40 EP BIOT PN 1 PG 0 WC Chemistry, Multidisciplinary SC Chemistry GA FG893 UT WOS:A1991FG89300455 ER PT J AU NEMEROFF, NH MCDONNELL, ME BUCKLEY, L AF NEMEROFF, NH MCDONNELL, ME BUCKLEY, L TI AN EFFICIENT SYNTHESIS OF A NOVEL 3,4-DISUBSTITUTED PYRROLE DERIVATIVE, METHYL 4(1-FERROCENYL)-3-PYRROLECARBOXYLATE SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 PHILADELPHIA COLL TEXT & SCI,DEPT CHEM,PHILADELPHIA,PA 19144. USN,CTR AIR DEV,WARMINSTER,PA 18974. 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 APR 14 PY 1991 VL 201 BP 41 EP CHED PN 1 PG 0 WC Chemistry, Multidisciplinary SC Chemistry GA FG893 UT WOS:A1991FG89300721 ER PT J AU JUAREZ, MA HECKENDORN, DK AF JUAREZ, MA HECKENDORN, DK TI STEREOCONTROL IN CYCLOPENTANES BY USE OF OXABICYCLO[3.3.0]OCTANES 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 APR 14 PY 1991 VL 201 BP 42 EP CHED PN 1 PG 0 WC Chemistry, Multidisciplinary SC Chemistry GA FG893 UT WOS:A1991FG89300722 ER PT J AU ROSS, MM CALLAHAN, JH MCELVANY, SW KING, FL AF ROSS, MM CALLAHAN, JH MCELVANY, SW KING, FL TI SURFACE-INDUCED DISSOCIATION TANDEM MASS-SPECTROMETRY SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 USN,RES LAB,DIV CHEM,WASHINGTON,DC 20375. VIRGINIA COMMONWEALTH UNIV,DEPT CHEM,RICHMOND,VA 23284. 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 APR 14 PY 1991 VL 201 BP 46 EP ANYL PN 1 PG 0 WC Chemistry, Multidisciplinary SC Chemistry GA FG893 UT WOS:A1991FG89300244 ER PT J AU KELLER, TM AF KELLER, TM TI SYNTHESIS AND THERMAL EVALUATION OF IMIDE-CONTAINING PHTHALONITRILES SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 USN,RES LAB,DIV CHEM,MAT 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 APR 14 PY 1991 VL 201 BP 62 EP POLY PN 2 PG 0 WC Chemistry, Multidisciplinary SC Chemistry GA FG894 UT WOS:A1991FG89400878 ER PT J AU DUDIS, DS KNACHEL, HC BLAZES, D AF DUDIS, DS KNACHEL, HC BLAZES, D TI THE ASYMMETRIC NITRIC-OXIDE DIMER REVISITED SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 WRIGHT RES & DEV CTR,WRIGHT PATTERSON AFB,OH 45433. UNIV DAYTON,DEPT CHEM,DAYTON,OH 45469. USN ACAD,DEPT CHEM,ANNAPOLIS,MD 21402. NR 1 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 APR 14 PY 1991 VL 201 BP 69 EP INOR PN 1 PG 0 WC Chemistry, Multidisciplinary SC Chemistry GA FG893 UT WOS:A1991FG89301964 ER PT J AU HOOVER, JM HENRY, RA LINDSAY, GA LOWEMA, CK NADLER, MP NEE, SM SELTZER, MD STENGERSMITH, JD AF HOOVER, JM HENRY, RA LINDSAY, GA LOWEMA, CK NADLER, MP NEE, SM SELTZER, MD STENGERSMITH, JD TI LANGMUIR-BLODGETT MULTILAYERS OF FLUORINATED, MAIN-CHAIN CHROMOPHORE, OPTICALLY NONLINEAR POLYMERS SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 USN,CTR WEAP,RES DEPT,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 APR 14 PY 1991 VL 201 BP 87 EP POLY PN 2 PG 0 WC Chemistry, Multidisciplinary SC Chemistry GA FG894 UT WOS:A1991FG89400903 ER PT J AU BLAZES, DL FITZGERALD, JP AF BLAZES, DL FITZGERALD, JP TI RHODIUM PORPHYRINS AS CYTOCHROME-P-450 MODELS 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 APR 14 PY 1991 VL 201 BP 89 EP CHED PN 1 PG 0 WC Chemistry, Multidisciplinary SC Chemistry GA FG893 UT WOS:A1991FG89300769 ER PT J AU MUELLER, E LITTLE, BJ AF MUELLER, E LITTLE, BJ TI INHIBITION OF CALCIUM-CARBONATE PRECIPITATION AND ASSOCIATED CORROSION ON STEEL SURFACES BY POLYANIONIC PEPTIDES SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 UNIV SO ALABAMA,CTR MINERALIZAT,MOBILE,AL 36688. USN,OCEANOG & ATMOSPHER LAB,STENNIS SPACE CTR,MS 39529. 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 APR 14 PY 1991 VL 201 BP 144 EP IEC PN 1 PG 0 WC Chemistry, Multidisciplinary SC Chemistry GA FG893 UT WOS:A1991FG89301892 ER PT J AU SAPERSTEIN, DD RABOLT, JF HOOVER, JM STROEVE, P AF SAPERSTEIN, DD RABOLT, JF HOOVER, JM STROEVE, P TI STRUCTURAL STUDIES OF LANGMUIR-BLODGETT-FILMS OF STILBAZOLIUM CHLORIDE POLYETHERS SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 IBM CORP,DIV STORAGE SYST PROD,SAN JOSE,CA 95193. IBM CORP,ALMADEN RES CTR,SAN JOSE,CA 95120. USN,CTR WEAP,CHINA LAKE,CA 93555. UNIV CALIF DAVIS,DEPT CHEM ENGN,DAVIS,CA 95616. 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 APR 14 PY 1991 VL 201 BP 192 EP POLY PN 2 PG 0 WC Chemistry, Multidisciplinary SC Chemistry GA FG894 UT WOS:A1991FG89401000 ER PT J AU HU, HSW CAMPBELL, JR GRIFFITH, JR AF HU, HSW CAMPBELL, JR GRIFFITH, JR TI L-PROLINE MODIFIED NYLONS 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 APR 14 PY 1991 VL 201 BP 260 EP POLY PN 2 PG 0 WC Chemistry, Multidisciplinary SC Chemistry GA FG894 UT WOS:A1991FG89401068 ER PT J AU KIM, OK CHOI, LS AF KIM, OK CHOI, LS TI AN UNUSUAL COMPLEXATION BEHAVIOR OF POLY(ACRYLIC ACID) INDUCED BY SHEAR - INFLUENCE OF THE MOLECULAR ENVIRONMENT 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 APR 14 PY 1991 VL 201 BP 292 EP POLY PN 2 PG 0 WC Chemistry, Multidisciplinary SC Chemistry GA FG894 UT WOS:A1991FG89401100 ER PT J AU MORIARTY, RM LIU, K HIRATAKE, J WENDLER, A AWASTHI, AK GILARDI, R AF MORIARTY, RM LIU, K HIRATAKE, J WENDLER, A AWASTHI, AK GILARDI, R TI SYNTHESIS, ISOLATION AND CHARACTERIZATION OF CHIRAL PENTACOORDINATED PHOSPHORUS - THE ABSOLUTE-CONFIGURATION OF UNSYMMETRICALLY SUBSTITUTED MONOCYCLIC OXYPHOSPHORANES SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 UNIV ILLINOIS,DEPT CHEM,CHICAGO,IL 60680. 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 APR 14 PY 1991 VL 201 BP 340 EP ORGN PN 2 PG 0 WC Chemistry, Multidisciplinary SC Chemistry GA FG894 UT WOS:A1991FG89400441 ER PT J AU YEE, RY HASTING, MAS AF YEE, RY HASTING, MAS TI THE MARK-HOUWINK-SAKURADA EQUATION FOR 3 OXETANE POLYMERS SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 USN,CTR WEAP,CHINA LAKE,CA 93555. AEROJET STRATEG PROPULS CO,SACRAMENTO,CA 95813. 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 APR 14 PY 1991 VL 201 BP 347 EP POLY PN 2 PG 0 WC Chemistry, Multidisciplinary SC Chemistry GA FG894 UT WOS:A1991FG89401155 ER PT J AU KAFAFI, ZH LINDLE, JR WEISBECKER, CS BARTOLI, FJ SHIRK, JS YOON, TH KIM, OK AF KAFAFI, ZH LINDLE, JR WEISBECKER, CS BARTOLI, FJ SHIRK, JS YOON, TH KIM, OK TI NONLINEAR OPTICAL STUDIES ON TRANSITION-METAL COMPLEXES OF ORTHO-AMINOBENZENETHIOL SO CHEMICAL PHYSICS LETTERS LA English DT Article ID CRYSTAL-STRUCTURE; PHTHALOCYANINES; SPECTROSCOPY; GENERATION; POLYMERS AB The third-order nonlinear optical susceptibilities, CHI-xxxx(3), of solutions of Co(III) and Ni(II) complexes of omicron-aminobenzenethiol, omicron-NH2C6H4SH, were measured by degenerate four-wave mixing at 1.064-mu-m. In solution, the deprotonation of Ni(omicron-NH2C6H4S)2 was found to occur in the presence of air and was accelerated by mild warming, yielding Ni(omicron-NHC6H4S)2. This complex has a large [gamma-xxxx] = 2 x 10(-31) esu with an estimated CHI-xxxx(3) on the order of 2 x 10(-9) esu. A low-energy d-d transition has been measured at 1.1-mu-m for the nickel complex and may be responsible for its enhanced third-order optical nonlinearity. RP KAFAFI, ZH (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. RI Lindle, James/A-9426-2009 NR 20 TC 10 Z9 10 U1 0 U2 4 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0009-2614 J9 CHEM PHYS LETT JI Chem. Phys. Lett. PD APR 12 PY 1991 VL 179 IS 1-2 BP 79 EP 84 DI 10.1016/0009-2614(91)90295-K PG 6 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA FH143 UT WOS:A1991FH14300014 ER PT J AU BUSH, BF LAGOWSKI, JJ MILES, MH OSTROM, GS AF BUSH, BF LAGOWSKI, JJ MILES, MH OSTROM, GS TI HELIUM PRODUCTION DURING THE ELECTROLYSIS OF D2O IN COLD FUSION EXPERIMENTS SO JOURNAL OF ELECTROANALYTICAL CHEMISTRY LA English DT Note ID DEUTERIUM C1 USN,CTR WEAP,RES DEPT,DIV CHEM,CHINA LAKE,CA 93555. UNIV TEXAS,DEPT CHEM,AUSTIN,TX 78712. NR 12 TC 47 Z9 47 U1 0 U2 1 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 APR 10 PY 1991 VL 304 IS 1-2 BP 271 EP 278 DI 10.1016/0022-0728(91)85510-V PG 8 WC Chemistry, Analytical; Electrochemistry SC Chemistry; Electrochemistry GA FK758 UT WOS:A1991FK75800025 ER PT J AU DAVIS, EE HOREL, GC MACDONALD, RD VILLINGER, H BENNETT, RH LI, H AF DAVIS, EE HOREL, GC MACDONALD, RD VILLINGER, H BENNETT, RH LI, H TI PORE PRESSURES AND PERMEABILITIES MEASURED IN MARINE-SEDIMENTS WITH A TETHERED PROBE SO JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH AND PLANETS LA English DT Article ID SPREADING-CENTER; HEAT-FLOW; GULF AB A new probe for measuring pore fluid pressures in marine sediments has been constructed and tested in two hydrologic environments on the Juan de Fuca Ridge. The instrument utilizes a highly incompliant high-sensitivity differential pressure transducer, and a small (4mm) diameter sensing probe that telescopes within a larger diameter 1.5-m-long (currently 2.5 m) strength member. The small probe diameter and the low compliancy serve to minimize the time required for pressures to approach equilibrium after penetration. Observed decay times are short enough to permit the instrumement to be used in a tethered mode. The mechanical configuration enables the small diameter probe to penetrate the sediments without buckling and to be pulled out without bending. This allows multiple penetrations to be completed during a single instrument lowering. Ten measurements were made during the development and testing of the instrument in fine-grained turbidite sediments on the Juan de Fuca Ridge. Four penetrations were uninterrupted by mechanical disturbances or instrumentational problems, and although equilibrium conditions were approached during only one penetration (2.7 hours maximum undisturbed decay period), all provided useful constraints on equilibrium pore pressures. Values at two sites where sediment cover is thick and heat flow relatively low were unresolvably different from hydrostatic. Values estimated from two penetrations located within a few hundred meters of a hydrothermal vent field within the sedimented axial valley of the northern Juan de Fuca Ridge, Middle Valley, exceeded hydrostatic and yielded pressure gradients of roughly 0.5 kPa m-1. Permeabilities were estimated from the rates of decay of the penetration transients. Values ranged from 5 x 10(-16) to 1 x 10(-14) m2 and agreed well with values measured on core samples collected near the probe penetrations which ranged from 8 x 10(-16) to 1 x 10(-14) m2. Using the values determined from the probe measurements from Middle Valley, the implied rate of fluid flow upward through the sediments in the vicinity of the vent field is roughly 5 x 10(-10) m s-1, or 15 mm yr-1. With the current practical limit of resolution of roughly 10(-10) m s-1 (3 mm yr-1) this direct measurement technique provides a means of determining pore fluid flow rates that is roughly 1 order of magnitude more sensitive than the method of estimating the rate of flow from the perturbation of the conductive thermal regime measured by typical marine heat flow instruments. C1 USN,OCEANOG & ATMOSPHER RES LAB,DIV SEAFLOOR,GEOSCI,NSTL STN,MS 39529. RP DAVIS, EE (reprint author), GEOL SURVEY CANADA,PACIFIC OCEON GEOSCI CTR,9860 W SAANICH RD,POB 6000,SIDNEY V8L 4B2,BC,CANADA. NR 30 TC 26 Z9 26 U1 0 U2 2 PU AMER GEOPHYSICAL UNION PI WASHINGTON PA 2000 FLORIDA AVE NW, WASHINGTON, DC 20009 SN 0148-0227 J9 J GEOPHYS RES-SOLID PD APR 10 PY 1991 VL 96 IS B4 BP 5975 EP 5984 DI 10.1029/91JB00220 PG 10 WC Geosciences, Multidisciplinary SC Geology GA FG773 UT WOS:A1991FG77300006 ER PT J AU WEAVER, BD POND, JM CHRISEY, DB HORWITZ, JS NEWMAN, HS SUMMERS, GP AF WEAVER, BD POND, JM CHRISEY, DB HORWITZ, JS NEWMAN, HS SUMMERS, GP TI PROTON RADIATION EFFECTS IN MICROWAVE CAVITIES AND RING RESONATORS FABRICATED FROM YBA2CU3O7-DELTA SO APPLIED PHYSICS LETTERS LA English DT Article ID SURFACE-RESISTANCE; PENETRATION DEPTH; SUPERCONDUCTORS; TEMPERATURE; OXYGEN; FILMS AB We report the first radiation effects study on a superconducting ring resonator made from thin-film YBa2Cu3O7-delta. Exposure to 2 MeV protons causes the superconducting transition temperature T(c) to decrease predictably with fluence. For temperatures below about 0.9T(c), there is no significant change in the transmission coefficient, the center frequency, or the quality factor Q of the resonator, even for doses in excess of 4 x 10(16) protons/cm2 (approximately 0.04 displacements per film atom). Similarly, the low-temperature surface resistance R(s) of an unpatterned film does not change with irradiation. We show that this insensitivity to radiation is not predicted by standard theory, and that the dominant part of R(s) at low temperature is the residual resistance R0. Thus any viable theory describing the origin of R0 must, as a criterion, explain the origin of its insensitivity to large irradiation doses. This criterion is used to evaluate theories ascribing R0 to weak links, flux pinning, impurities, and lattice imperfections. RP WEAVER, BD (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 22 TC 10 Z9 10 U1 0 U2 1 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0003-6951 J9 APPL PHYS LETT JI Appl. Phys. Lett. PD APR 8 PY 1991 VL 58 IS 14 BP 1563 EP 1565 DI 10.1063/1.105178 PG 3 WC Physics, Applied SC Physics GA FF231 UT WOS:A1991FF23100037 ER PT J AU HEGEDUS, CR KAMEL, IL AF HEGEDUS, CR KAMEL, IL TI SUBMICRON PYROGENIC SILICA AND ITS USE IN POLYMER AND COATING SYSTEMS SO PROGRESS IN ORGANIC COATINGS LA English DT Article ID FILLED POLYMERS; INTERFACIAL INTERACTIONS; MECHANICAL-PROPERTIES; ULTRAFINE PARTICLES; ADSORPTION; SURFACE; COMPOSITES; POLYSTYRENE; BEHAVIOR; AEROSIL C1 DREXEL UNIV,DEPT MAT ENGN,PHILADELPHIA,PA 19104. RP HEGEDUS, CR (reprint author), USN,CTR AIR DEV,DEPT AIR VEHICLE & CREW SYST TECHNOL,WARMINSTER,PA 18974, USA. NR 68 TC 2 Z9 2 U1 0 U2 0 PU ELSEVIER SCIENCE SA LAUSANNE PI LAUSANNE 1 PA PO BOX 564, 1001 LAUSANNE 1, SWITZERLAND SN 0300-9440 J9 PROG ORG COAT JI Prog. Org. Coat. PD APR 3 PY 1991 VL 19 IS 1 BP 1 EP 20 DI 10.1016/0033-0655(91)80008-7 PG 20 WC Chemistry, Applied; Materials Science, Coatings & Films SC Chemistry; Materials Science GA FH771 UT WOS:A1991FH77100001 ER PT J AU JACOB, RJK AF JACOB, RJK TI THE USE OF EYE-MOVEMENTS IN HUMAN-COMPUTER INTERACTION TECHNIQUES - WHAT YOU LOOK AT IS WHAT YOU GET SO ACM TRANSACTIONS ON INFORMATION SYSTEMS LA English DT Article DE EYE MOVEMENTS; EYE TRACKING; HUMAN-COMPUTER INTERACTION; STATE TRANSITION DIAGRAM; UIMS; INPUT ID INPUT AB In seeking hitherto-unused methods by which users and computers can communicate, we investigate the usefulness of eye movements as a fast and convenient auxiliary user-to-computer communication mode. The barrier to exploiting this medium has not been eye-tracking technology but the study of interaction techniques that incorporate eye movements into the user-computer dialogue in a natural and unobtrusive way. This paper discusses some of the human factors and technical considerations that arise in trying to use eye movements as an input medium, describes our approach and the first eye movement-based interaction techniques that we have devised and implemented in our laboratory, and reports our experiences and observations on them. RP JACOB, RJK (reprint author), USN,RES LAB,HUMAN COMP INTERACT LAB,WASHINGTON,DC 20375, USA. NR 16 TC 241 Z9 252 U1 2 U2 24 PU ASSOC COMPUTING MACHINERY PI NEW YORK PA 1515 BROADWAY, NEW YORK, NY 10036 SN 1046-8188 J9 ACM T INFORM SYST JI ACM Trans. Inf. Syst. PD APR PY 1991 VL 9 IS 2 BP 152 EP 169 DI 10.1145/123078.128728 PG 18 WC Computer Science, Information Systems SC Computer Science GA GR926 UT WOS:A1991GR92600004 ER PT J AU FOX, AG TABBERNOR, MA AF FOX, AG TABBERNOR, MA TI THE BONDING CHARGE-DENSITY OF BETA'NIAL SO ACTA METALLURGICA ET MATERIALIA LA English DT Article ID ATOMIC SCATTERING FACTORS; VOLTAGE ELECTRON-DIFFRACTION; GAMMA-RAY DIFFRACTOMETRY; WHITE RADIATION; X-RAY; BETA'-NIAL ALLOYS; COMPTON PROFILE; ENERGY-BANDS; COPPER; BERYLLIUM AB The (100), (110), (111) and (200) low-angle structure factors of beta-'NiAl have been accurately measured by high energy electron diffraction (HEED) and it was found that, except for the (200) reflection, these agreed closely with the values deduced by interpolation between the best pure element crystal atomic scattering (form) factors; the (200) structure factor was found to be about 2% lower than the best equivalent pure element value. The trend of these results is somewhat similar to those obtained from powder X-ray diffraction measurements made on beta-'NiAl over 25 years ago and indicates that there is no ionic component in the bonding scheme for this alloy. This was confirmed by the generation of deformation electron density distributions (DEDDS) from the structure factor data which showed that bonding is this alloy is achieved by the depletion of electrons from both the nickel and aluminum atom sites with extensive charge build-up at the mid-points between nearest-neighbor (n.n.) Ni-Al atoms ([111] directions). This shows that bonding in this intermetallic compound is essentially covalent with some metallic character and no ionic component. The DEDDs also showed a large depletion of electrons between second n.n. Al-Al atoms ([100] directions) which also occurred, but to a lesser extent second n.n. Ni-Ni atoms. This suggests that as well as the atomic size difference, there are electronic reasons why n.n. and second n.n. Al-Al bonds are not favored in this B2 alloy type. This explains why beta-'FeAl, beta-'CoAl and beta-'NiAl are usually fully ordered and do not easily tolerate Al antistructure atoms on their transition metal sublattices. The build-up of electrons between n.n. atoms along [111] and depletion between second n.n. Ni-Ni and Al-Al atoms along [100] also gives indications of the electronic origins of the omega phase (collapse of atoms along [111] directions towards vacancy or antistructure atom defects) and the elastic softening associated with shear along [011BAR] on (011), which occurs in beta-'NiAl containing more than about 53 at.% Ni. C1 WOLVERHAMPTON POLYTECH, SCH CONSTRUCT ENGN & TECHNOL, WOLVERHAMPTON WV1 1SB, ENGLAND. RP FOX, AG (reprint author), USN, POSTGRAD SCH, DEPT MECH ENGN, MAT SCI SECT, MONTEREY, CA 93943 USA. NR 56 TC 60 Z9 63 U1 1 U2 1 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLAND SN 0956-7151 J9 ACTA METALL MATER JI Acta Metall. Mater. PD APR PY 1991 VL 39 IS 4 BP 669 EP 678 DI 10.1016/0956-7151(91)90135-N PG 10 WC Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Materials Science; Metallurgy & Metallurgical Engineering GA FC232 UT WOS:A1991FC23200025 ER PT J AU KEITH, WL BENNETT, JC AF KEITH, WL BENNETT, JC TI LOW-FREQUENCY SPECTRA OF THE WALL SHEAR-STRESS AND WALL PRESSURE IN A TURBULENT BOUNDARY-LAYER SO AIAA JOURNAL LA English DT Article AB Measurements of the autospectra of the fluctuating wall shear stress and wall pressure in a fully developed turbulent boundary layer at Reynolds numbers R-THETA = 8200 and 13,400 are presented. The measurements were made in the Quiet Water Tunnel at the Naval Underwater Systems Center. Use of this facility enabled a direct comparison of the spectral levels of both quantities to be made at low frequencies. The frequency ranges over which the pressure and shear stress spectra are accurately resolved are discussed. For these frequencies, the spectra compare favorably with published results at comparable Reynolds numbers. The method used to calibrate the hotfilm wall shear stress transducers, based upon the measured mean velocity profiles, is presented in detail. This technique is believed to be the most accurate for high-Reynolds-number turbulent boundary layers of the type investigated here. The error involved in the determination of the mean wall shear stress is shown to be the limiting factor in determining the absolute spectral levels of the fluctuating wall shear stress. C1 UNIV CONNECTICUT,DEPT MECH ENGN,STORRS,CT 06269. RP KEITH, WL (reprint author), USN,CTR UNDERWATER SYST,DEPT SUBMARINE SONAR,NEW LONDON,CT 06320, USA. NR 12 TC 21 Z9 21 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 APR PY 1991 VL 29 IS 4 BP 526 EP 530 DI 10.2514/3.10615 PG 5 WC Engineering, Aerospace SC Engineering GA FJ316 UT WOS:A1991FJ31600006 ER PT J AU BROUKER, ME GEIGER, D MCCARTHY, JA AF BROUKER, ME GEIGER, D MCCARTHY, JA TI PHARMACEUTICAL SERVICES IN THE CASUALTY RECEPTION AREA ON THE USNS-COMFORT SO AMERICAN JOURNAL OF HOSPITAL PHARMACY LA English DT Editorial Material C1 USN,DEPT PHARM,USNS COMFORT,WASHINGTON,DC 20350. RP BROUKER, ME (reprint author), USN,MED SERV CORP,USNS COMFORT,WASHINGTON,DC 20350, USA. NR 0 TC 1 Z9 1 U1 0 U2 0 PU AMER SOC HEALTH-SYSTEM PHARMACISTS PI BETHESDA PA 7272 WISCONSIN AVE, BETHESDA, MD 20814 SN 0002-9289 J9 AM J HOSP PHARM JI Am. J. Hosp. Pharm. PD APR PY 1991 VL 48 IS 4 BP 730 EP 731 PG 2 WC Pharmacology & Pharmacy SC Pharmacology & Pharmacy GA FD776 UT WOS:A1991FD77600023 PM 2042674 ER PT J AU LONG, GW JONES, TR RICKMAN, LS TRIMMER, R HOFFMAN, SL AF LONG, GW JONES, TR RICKMAN, LS TRIMMER, R HOFFMAN, SL TI ACRIDINE-ORANGE DETECTION OF PLASMODIUM-FALCIPARUM MALARIA - RELATIONSHIP BETWEEN SENSITIVITY AND OPTICAL CONFIGURATION SO AMERICAN JOURNAL OF TROPICAL MEDICINE AND HYGIENE LA English DT Article ID RAPID DIAGNOSIS AB Blood samples collected from five volunteers participating in a P. falciparum infectivity trial were examined to determine the efficacy of the acridine orange technique. Several lens configurations were tested for efficiency in the diagnosis of malaria using this system. There was no significant difference in the sensitivity for detecting positive specimens or number of parasites among three lens configurations: a 50 x long working distance objective (0.34 mm) with either a 10 x ocular (total magnification 500 x) or a 12.5 x ocular (625 x) and a 750 x configuration using a 50 x objective with a shorter working distance (0.24 mm). All three lens configurations were significantly better than the 1,000 x configuration using a commonly available 100 x oil immersion objective. The results achieved using this lens still exceeded the sensitivity of the thick blood film. C1 USN,MED RES INST,BETHESDA,MD 20814. USN,CTR MED,BETHESDA,MD 20814. NR 5 TC 6 Z9 6 U1 0 U2 0 PU AMER SOC TROP MED & HYGIENE PI MCLEAN PA 8000 WESTPARK DRIVE SUITE 130, MCLEAN, VA 22101 SN 0002-9637 J9 AM J TROP MED HYG JI Am. J. Trop. Med. Hyg. PD APR PY 1991 VL 44 IS 4 BP 402 EP 405 PG 4 WC Public, Environmental & Occupational Health; Tropical Medicine SC Public, Environmental & Occupational Health; Tropical Medicine GA FQ879 UT WOS:A1991FQ87900008 PM 1710424 ER PT J AU LICINA, MG SCHUBERT, A TOBIN, JE NICODEMUS, HF SPITZER, L AF LICINA, MG SCHUBERT, A TOBIN, JE NICODEMUS, HF SPITZER, L TI INTRATHECAL MORPHINE DOES NOT REDUCE MINIMUM ALVEOLAR CONCENTRATION OF HALOTHANE IN HUMANS - RESULTS OF A DOUBLE-BLIND-STUDY SO ANESTHESIOLOGY LA English DT Article DE ANALGESICS, INTRATHECAL, MORPHINE; ANESTHETIC TECHNIQUES, SPINAL, MORPHINE; ANESTHETICS, VOLATILE, HALOTHANE; POTENCY, MAC AB The effect of intrathecal morphine on the minimum alveolar concentration (MAC) of halothane was investigated in 22 patients undergoing elective abdominal surgery. The patients were randomly assigned to the control (CTRL) or intrathecal morphine sulfate (ITMS)-treated groups. Approximately 2.5 h before induction of anesthesia with halothane, the ITMS-treated group received 15-mu-g/ kg preservative-free ITMS (Duramorph; Elkins-Sinn, Cherry Hill, NJ) while in the right lateral decubitus position. The CTRL group was treated in an identical fashion except that, after placement of the introducer needle, actual dural puncture was omitted. After inhalational induction with halothane as the sole anesthetic agent, the patients' responses to surgical incision were recorded. MAC was determined with the modified up-down method of Dixon and verified with probit analysis. MAC (+/- SE) after ITMS was 0.76 +/- 0.06, compared with a CTRL MAC of 0.78 +/- 0.15 (not significant). Under the conditions of this study, the MAC of halothane in humans was not significantly affected by ITMS. C1 PORTSMOUTH NAVAL HOSP,DEPT ANESTHESIOL,PORTSMOUTH,VA. USN HOSP,SCH NURSE ANESTHESIA,BETHESDA,MD 20814. GEORGETOWN UNIV,DEPT ANESTHESIOL,WASHINGTON,DC 20057. CLEVELAND CLIN EDUC FDN,DEPT ANESTHESIOL,CLEVELAND,OH 44106. USN HOSP,DEPT ANESTHESIOL,BETHESDA,MD 20814. RP LICINA, MG (reprint author), CLEVELAND CLIN FDN,DEPT CARDIOTHORAC ANESTHESIA,1 CLIN CTR,CLEVELAND,OH 44195, USA. RI Schubert, Armin/D-3589-2011 NR 19 TC 8 Z9 8 U1 0 U2 2 PU LIPPINCOTT-RAVEN PUBL PI PHILADELPHIA PA 227 EAST WASHINGTON SQ, PHILADELPHIA, PA 19106 SN 0003-3022 J9 ANESTHESIOLOGY JI Anesthesiology PD APR PY 1991 VL 74 IS 4 BP 660 EP 663 DI 10.1097/00000542-199104000-00007 PG 4 WC Anesthesiology SC Anesthesiology GA FE106 UT WOS:A1991FE10600007 PM 2008946 ER PT J AU GOLDBERG, L WELLER, JF AF GOLDBERG, L WELLER, JF TI BROAD-AREA HIGH-POWER SEMICONDUCTOR OPTICAL AMPLIFIER SO APPLIED PHYSICS LETTERS LA English DT Article ID TRAVELING-WAVE AMPLIFIER; LASER DIODE-ARRAY; INJECTION LOCKING AB Operating characteristics of a high-power 400-mu-m-wide, 500-mu-m-long double-pass near-traveling-wave GaAlAs amplifier are described. In pulsed operation, 2.5 W of diffraction-limited emission at 820 nm was obtained with an external power gain of 10 dB and 24% electrical to optical conversion efficiency. RP GOLDBERG, L (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 9 TC 14 Z9 14 U1 0 U2 3 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0003-6951 J9 APPL PHYS LETT JI Appl. Phys. Lett. PD APR 1 PY 1991 VL 58 IS 13 BP 1357 EP 1359 DI 10.1063/1.104307 PG 3 WC Physics, Applied SC Physics GA FE378 UT WOS:A1991FE37800002 ER PT J AU PAZIK, JC KELNER, G BOTTKA, N AF PAZIK, JC KELNER, G BOTTKA, N TI EPITAXIAL-GROWTH OF BETA-SIC ON SILICON-ON-SAPPHIRE SUBSTRATES BY CHEMICAL VAPOR-DEPOSITION SO APPLIED PHYSICS LETTERS LA English DT Article ID CARBIDE; SEMICONDUCTORS AB Cubic (beta) silicon carbide films have been grown epitaxially on silicon-on-sapphire (SOS) substrates by chemical vapor deposition. The beta-SiC films were grown between 1340-1370-degrees-C on SOS substrates which have a layer of silicon deposited in situ or were grown directly on the as-is SOS substrate. In both cases, the silicon surface was carbonized prior to growth of the beta-SiC epilayer. With a growth rate of approximately 3.5-mu-m/h, 7-mu-m beta-SiC films have been obtained. The films have been characterized by infrared reflectance spectroscopy, optical and scanning electron microscopy. Specular films are obtained which have growth columns and pits. Electrical transport properties of the films were measured by the Van der Pauw-Hall method. The films are p type with carrier concentrations between 1 X 10(18) and 2 X 10(18) cm-3 and Hall mobilities of approximately 30 cm2/V s. RP PAZIK, JC (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 10 TC 12 Z9 12 U1 0 U2 4 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0003-6951 J9 APPL PHYS LETT JI Appl. Phys. Lett. PD APR 1 PY 1991 VL 58 IS 13 BP 1419 EP 1421 DI 10.1063/1.105185 PG 3 WC Physics, Applied SC Physics GA FE378 UT WOS:A1991FE37800023 ER PT J AU PORTER, JG DERE, KP AF PORTER, JG DERE, KP TI THE MAGNETIC NETWORK LOCATION OF EXPLOSIVE EVENTS OBSERVED IN THE SOLAR TRANSITION REGION SO ASTROPHYSICAL JOURNAL LA English DT Article DE SUN; ACTIVITY; SUN; ATMOSPHERIC MOTIONS; SUN; FLARES; SUN; MAGNETIC FIELDS; SUN; TRANSITION REGION ID QUIET SUN; FIELD; ZONE; FLUX AB Compact, short-lived explosive events have been observed in solar transition region lines with the High-Resolution Telescope and Spectrograph (HRTS) flown by the Naval Research Laboratory on a series of rockets and on Spacelab 2. We present the first coalignment of such data, from Spacelab 2, with a simultaneous magnetogram and near-simultaneous He I lambda-10380 spectroheliogram obtained at the National Solar Observatory at Kitt Peak. The comparison shows that the explosive events occur in the solar magnetic network lanes at the boundaries of supergranular convective cells. However, the events occur away from the larger concentrations of magnetic flux in the network, in contradiction to the observed tendency of the more energetic solar phenomena to be associated with the stronger magnetic fields. C1 USN,RES LAB,WASHINGTON,DC 20375. RP PORTER, JG (reprint author), NASA,GEORGE C MARSHALL SPACE FLIGHT CTR,HUNTSVILLE,AL 35812, USA. NR 22 TC 54 Z9 55 U1 0 U2 0 PU UNIV CHICAGO PRESS PI CHICAGO PA 5720 S WOODLAWN AVE, CHICAGO, IL 60637 SN 0004-637X J9 ASTROPHYS J JI Astrophys. J. PD APR 1 PY 1991 VL 370 IS 2 BP 775 EP & DI 10.1086/169860 PN 1 PG 0 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA FB172 UT WOS:A1991FB17200029 ER PT J AU BREKKE, P KJELDSETHMOE, O BARTOE, JDF BRUECKNER, GE AF BREKKE, P KJELDSETHMOE, O BARTOE, JDF BRUECKNER, GE TI AN ULTRAVIOLET SPECTRAL ATLAS OF A SUNSPOT AND AN ACTIVE REGION 1190-1730-A SO ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES LA English DT Article DE LINE IDENTIFICATIONS, SUN; ATMOSPHERIC MOTIONS, SUN; SPECTRA, SUN; SUNSPOTS, ULTRAVIOLET; SPECTRA ID SOLAR; SPECTROGRAPH; CORONA AB An ultraviolet spectral atlas of a sunspot with high spectral and spatial resolution in the wavelength region 1190-1730 angstrom is presented. The sunspot was observed with the High Resolution Telescope and Spectrograph (HRTS) from a rocket in 1978. The spatial resolution on this flight was 2" with a time resolution from 0.2 to 20.2 s. The atlas contains spectra of three different areas in the sunspot and also of an active region and a quiet region. The selected areas are averaged over several arcsec, ranging from 3.5" in the sunspot to 18" in the quiet region (see Table 4). Brief descriptions of the data reduction and calibration procedures are given. The absolute intensities are determined with an accuracy of +/- 30% and the wavelength scale is accurate to better than 0.01 angstrom. The transition region lines show the most extreme example known of downflowing gas above a sunspot, a phenomenon which seems to be commonly connected to sunspots (e.g., Kjeldseth-Moe et al.). The atlas is available in a machine-readable form together with an IDL program to interactively measure linewidths, total intensities, and solar wavelengths. C1 USN,RES LAB,EO HULBURT CTR SPACE RES,WASHINGTON,DC 20375. RP BREKKE, P (reprint author), UNIV OSLO,INST THEORET ASTROPHYS,POB 1029,N-0315 OSLO 3,NORWAY. NR 26 TC 36 Z9 36 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 APR PY 1991 VL 75 IS 4 BP 1337 EP 1366 DI 10.1086/191562 PG 30 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA FC835 UT WOS:A1991FC83500008 ER PT J AU BOHNKER, B FRASER, J BAGGETT, J HAYES, G AF BOHNKER, B FRASER, J BAGGETT, J HAYES, G TI INFLIGHT ANXIETY CONDITIONS PRESENTING WITH BREAK-OFF SYMPTOMS SO AVIATION SPACE AND ENVIRONMENTAL MEDICINE LA English DT Article ID FEAR AB The psychological dimension of disorientation is explored through two experienced pilots who developed inflight anxiety conditions. These were associated with "break-off" symptoms, which are inflight sensations of separation from the ground, the environment, and the aircraft. Following extensive psychiatric and medical evaluations, one aviator was diagnosed as having agoraphobia without panic disorder, and the other as having an otherwise unspecified anxiety disorder. These patients reports demonstrate the need for the clinical aerospace medicine specialist to investigate inflight anxiety conditions for underlying neuropsychiatric disorders. The reports also contrast some of the historical aeromedical concepts with modern psychiatric diagnostic nomenclature. C1 USN,INST AEROSP MED,DEPT PSYCHIAT,PENSACOLA,FL 32508. USN,INST AEROSP MED,DEPT INTERNAL MED,PENSACOLA,FL 32508. NR 25 TC 1 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 APR PY 1991 VL 62 IS 4 BP 342 EP 345 PG 4 WC Public, Environmental & Occupational Health; Medicine, General & Internal; Sport Sciences SC Public, Environmental & Occupational Health; General & Internal Medicine; Sport Sciences GA FD439 UT WOS:A1991FD43900012 PM 2031638 ER PT J AU BUTLER, FK AF BUTLER, FK TI DECOMPRESSION-SICKNESS PRESENTING AS OPTIC NEUROPATHY SO AVIATION SPACE AND ENVIRONMENTAL MEDICINE LA English DT Article ID HYPERBARIC-OXYGEN; MULTIPLE-SCLEROSIS; DELAYED TREATMENT; THERAPY AB Decompression sickness (DCS) is a systemic disorder caused by an abrupt decrease in the ambient atmospheric pressure to which an individual is exposed. A previously healthy 23-year-old male parachutist developed optic neuropathy after a series of multiple repeated hypobaric exposures; his symptoms improved promptly with recompression and hyperbaric oxygen therapy. We believe this to be the first reported case of DCS presenting as optic neuropathy. RP BUTLER, FK (reprint author), USN HOSP,DEPT OPHTHALMOL,PENSACOLA NAVAL AIR STN,PENSACOLA,FL 32512, USA. NR 11 TC 13 Z9 13 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 APR PY 1991 VL 62 IS 4 BP 346 EP 350 PG 5 WC Public, Environmental & Occupational Health; Medicine, General & Internal; Sport Sciences SC Public, Environmental & Occupational Health; General & Internal Medicine; Sport Sciences GA FD439 UT WOS:A1991FD43900013 PM 2031639 ER PT J AU GUBSER, DU AF GUBSER, DU TI UNITED-STATES NAVY SUPERCONDUCTIVITY PROGRAM SO BULLETIN OF MATERIALS SCIENCE LA English DT Editorial Material CT INTERNATIONAL CONF ON SUPERCONDUCTIVITY CY JAN 10-14, 1990 CL BANGALORE, INDIA SP SUPERCONDUCT PROGRAMME MANAGEMENT BOARD INDIA, DEPT SCI & TECHNOL INDIA RP GUBSER, DU (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU INDIAN ACADEMY SCIENCES PI BANGALORE PA P B 8005 C V RAMAN AVENUE, BANGALORE 560 080, INDIA SN 0250-4707 J9 B MATER SCI JI Bull. Mat. Sci. PD APR PY 1991 VL 14 IS 2 BP 157 EP 159 DI 10.1007/BF02747307 PG 3 WC Materials Science, Multidisciplinary SC Materials Science GA FX174 UT WOS:A1991FX17400011 ER PT J AU BROOKS, AL SAENGER, RA AF BROOKS, AL SAENGER, RA TI VERTICAL SIZE-DEPTH DISTRIBUTION PROPERTIES OF MIDWATER FISH OFF BERMUDA, WITH COMPARATIVE REVIEWS FOR OTHER OPEN OCEAN AREAS SO CANADIAN JOURNAL OF FISHERIES AND AQUATIC SCIENCES LA English DT Article ID SARGASSO SEA; PACIFIC-OCEAN; EASTERN GULF; ECOLOGY; ZOOPLANKTON; COPEPODS; SURFACE; HAWAII; MEXICO AB The nighttime (N) and daytime (D) size-depth distributions of mesopelagic fish at Ocean Acre, a typical deepwater site in the North Sargasso Sea, are described using archival discrete-depth data from the surface to about 1500 m. The N/D abundance distributions n(z) for a representative group of 18 swimbladdered species indicate that fish are concentrated in the 0-150 m euphotic zone at night and in the 400-1000 m zone during the day in spring, summer, and winter. Seasonal succession in the average life stage size classes of the bladdered group occurs, but all classes are present year-round due to the variety of specific spawning patterns. The noncoincident N/D depth niches of individual bladdered species apparently are organized to reduce competition. Normalized N/D depth distributions n(z) for the bladdered group are similar throughout the year, and appear to be determined, respectively, by the N distribution of zooplankton biomas and the D underwater light field, other hydrographic variables having little direct influence. Also, it seems likely that the form of n(z) is relatively insensitive to species composition for such groups. These hypotheses are verified qualitatively by comparing specific and group distribution properties at other ocean sites with those at Ocean Acre. C1 USN,CTR UNDERWATER SYST,DEPT SURFACE SHIP SONAR,NEW LONDON,CT 06320. NR 67 TC 7 Z9 7 U1 0 U2 1 PU NATL RESEARCH COUNCIL CANADA PI OTTAWA PA RESEARCH JOURNALS, MONTREAL RD, OTTAWA ON K1A 0R6, CANADA SN 0706-652X J9 CAN J FISH AQUAT SCI JI Can. J. Fish. Aquat. Sci. PD APR PY 1991 VL 48 IS 4 BP 694 EP 721 PG 28 WC Fisheries; Marine & Freshwater Biology SC Fisheries; Marine & Freshwater Biology GA FF520 UT WOS:A1991FF52000020 ER PT J AU MAHMOUD, S STALEY, J TAYLOR, J BOGDEN, A MOREAU, JP COY, D AVIS, I CUTTITTA, F MULSHINE, JL MOODY, TW AF MAHMOUD, S STALEY, J TAYLOR, J BOGDEN, A MOREAU, JP COY, D AVIS, I CUTTITTA, F MULSHINE, JL MOODY, TW TI [PSI13,14] BOMBESIN ANALOGS INHIBIT GROWTH OF SMALL-CELL LUNG-CANCER INVITRO AND INVIVO SO CANCER RESEARCH LA English DT Article ID GASTRIN-RELEASING PEPTIDE; SWISS 3T3 CELLS; RECEPTOR ANTAGONISTS; CLONAL GROWTH; CARCINOMA; LINES; EXPRESSION; CALCIUM; BINDING; POTENT AB Bombesin/gastrin releasing peptide (BN/GRP) functions as an autocrine growth factor in small cell lung cancer (SCLC). Previously, this autocrine growth cycle was disrupted by a monoclonal antibody which binds to the carboxyl terminal of BN and neutralizes the peptide so that it is unable to interact with the BN/GRP receptor. Here a series of BN analogues were synthesized which have a reduced peptide bond near the carboxyl terminal. The analogues inhibited specific binding of I-125-GRP to SCLC cell line NCI-H345 in a dose-dependent manner and the analogue [D-Nal6, Psi13,14, Phe14] BN6-14 was approximately 6-fold more potent than was (Psi13,14, Leu14)BN with a 50% inhibition concentration value of 5 nM. [DNal6, Psi13,14, Phe14]BN6-14 and [Psi13,14, Leu14]BN had no effect on the cytosolic Ca2+ levels but antagonized the increase in cytosolic Ca2+ caused by 10 nM BN. [Psi13,14, Leu14]BN (1-mu-M) inhibited the growth of SCLC in vitro using a clonogenic assay by approximately 70% Also, injection of [Psi13,14, Leu14]BN (10-mu-g, s.c.) inhibited the growth of SCLC xenografts in nude mice in vivo by approximately 50%. These data suggest that the autocrine growth cycle of BN/GRP in SCLC may also be disrupted by peptide antagonists which bind to the BN receptor. C1 GEORGE WASHINGTON UNIV,SCH MED & HLTH SCI,DEPT BIOCHEM & MOLEC BIOL,WASHINGTON,DC 20037. BIOMEASURE INC,HOPKINTON,MA 01748. TULANE UNIV,SCH MED,NEW ORLEANS,LA 70112. USN HOSP,NCI,NCI NAVY MED ONCOL BRANCH,BETHESDA,MD 20814. FU NCI NIH HHS [CA-53477, CA-45153, CA-48071] NR 32 TC 163 Z9 165 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 0008-5472 J9 CANCER RES JI Cancer Res. PD APR 1 PY 1991 VL 51 IS 7 BP 1798 EP 1802 PG 5 WC Oncology SC Oncology GA FE041 UT WOS:A1991FE04100008 PM 1848479 ER PT J AU SEN, RP WALSH, TE AF SEN, RP WALSH, TE TI ACCIDENTAL METHACHOLINE BRONCHOPROVOCATION IN A LABORATORY WORKER SO CHEST LA English DT Letter RP SEN, RP (reprint author), USN HOSP,DIV PULM MED,BETHESDA,MD 20814, USA. NR 3 TC 1 Z9 1 U1 0 U2 1 PU AMER COLL CHEST PHYSICIANS PI NORTHBROOK PA 3300 DUNDEE ROAD, NORTHBROOK, IL 60062-2348 SN 0012-3692 J9 CHEST JI Chest PD APR PY 1991 VL 99 IS 4 BP 1053 EP 1054 PG 2 WC Critical Care Medicine; Respiratory System SC General & Internal Medicine; Respiratory System GA FF517 UT WOS:A1991FF51700069 PM 2009771 ER PT J AU GOLDMAN, G WELBOURN, R KLAUSNER, JM VALERI, CR SHEPRO, D HECHTMAN, HB AF GOLDMAN, G WELBOURN, R KLAUSNER, JM VALERI, CR SHEPRO, D HECHTMAN, HB TI THROMBOXANE MEDIATES DIAPEDESIS AFTER ISCHEMIA BY ACTIVATION OF NEUTROPHIL ADHESION RECEPTORS INTERACTING WITH BASALLY EXPRESSED INTERCELLULAR-ADHESION MOLECULE .1. SO CIRCULATION RESEARCH LA English DT Article DE THROMBOXANE SYNTHESIS; THROMBOXANE RECEPTOR ANTAGONISTS; AUTHENTIC THROMBOXANE-B2; CD-18 ID MYOCARDIAL REPERFUSION INJURY; LEUKOCYTE ADHESION; MONOCLONAL-ANTIBODY; LIMB ISCHEMIA; ADHERENCE; ENDOTHELIUM; INVITRO; MAC-1; LFA-1; GLYCOPROTEIN AB Ischemic injury is characterized by neutrophil (PMN)-endothelial cell adhesion and diapedesis associated with thromboxane (TX) generation. Neutrophil-endothelial cell interaction is regulated in part by the leukocyte adhesion receptor CD 18 glycoprotein complex and the endothelial intercellular adhesion molecule-1 (ICAM-1). This study tests the role of TX in ischemia-induced diapedesis and evaluates whether the diapedesis is regulated by neutrophil or endothelial adhesion receptors. Plasma derived from rabbit hind limbs made ischemic for 3 hours (n = 6) and reperfused for 10 minutes had increased levels of TXB2 3,450 pg/ml, which was higher than sham rabbit (n = 6) values of 653 pg/ml (p < 0.05). When introduced into abraded skin chambers placed on the dorsum of other normal rabbits (n = 6), this ischemic plasma induced 1,000 pg/ml of new TX synthesis and diapedesis of 1,235 PMN/mm3. The total TX concentration and PMN accumulations in blister fluid were correlated (r = 0.88, p < 0.05). In contrast, sham rabbit plasma induced no TX synthesis and diapedesis of only 77 PMN/mm3 (p < 0.05). Administration of 50 ng/ml of authentic TXB2 into blisters induced an accumulation of 453 PMN/mm3, which was higher than that in saline controls (18 PMN/mm3) (p < 0.05). Pretreatment of normal rabbits used for the diapedesis assay (n = 4) with the TX synthetase inhibitor OKY 046 (2 mg/kg/hr) limited ischemic plasma and authentic TXB2 induced diapedesis to 142 and 76 PMN/mm3, respectively (both p < 0.05). Pretreatment of other normal rabbits (n = 4) with the TX receptor antagonist SQ 29,548 (2 mg/kg) by intravenous bolus and then 0.2 mg/kg min also reduced diapedesis induced by ischemic plasma and authentic TXB2 to 48 and 8 PMN/mm3 (both p < 0.05). In yet other rabbits (n = 9), antagonists and agonists were locally administered into the abraded skin chambers. With the saline control antagonist, ischemic plasma or authentic TXB2 led to 927 and 404 PMN/mm3. The CD 18 monoclonal antibody R 15.7 lowered ischemic plasma and authentic TXB2 induced diapedesis to 21 and 22 PMN/mm3, respectively (both p < 0.05). R 15.7 was shown to diffuse from blister and progressively bind to circulating PMNs over the 3-hour monitoring period. Local administration of the anti-ICAM-1 antibody RR 1.1 also reduced diapedesis induced by ischemic plasma and authentic TXB2 to 119 and 93 PMN/mm3, respectively (both p < 0.05). In contrast, local application of the protein synthesis inhibitor actinomycin D (3 ng) was without inhibitory effect, suggesting a lack of synthesis of new endothelial adhesion proteins. The data indicate that TX mediates diapedesis after ischemia through regulation of neutrophil but not endothelial cell adhesion receptors. C1 BRIGHAM & WOMENS HOSP,DEPT SURG,75 FRANCIS ST,BOSTON,MA 02115. HARVARD UNIV,SCH MED,DEPT SURG,BOSTON,MA 02115. USN,BLOOD RES LAB,WASHINGTON,DC 20350. BOSTON UNIV,SCH MED,CTR BIOL SCI,BOSTON,MA 02118. FU NHLBI NIH HHS [HL-16714-13]; NIGMS NIH HHS [GM-24891-11, GM-35141-03] NR 31 TC 60 Z9 60 U1 0 U2 0 PU AMER HEART ASSOC PI DALLAS PA 7272 GREENVILLE AVENUE, DALLAS, TX 75231-4596 SN 0009-7330 J9 CIRC RES JI Circ.Res. PD APR PY 1991 VL 68 IS 4 BP 1013 EP 1019 PG 7 WC Cardiac & Cardiovascular Systems; Hematology; Peripheral Vascular Disease SC Cardiovascular System & Cardiology; Hematology GA FE587 UT WOS:A1991FE58700012 PM 1672629 ER PT J AU GILADI, E NAGALLA, SR JOHNSON, BE SPINDEL, ER AF GILADI, E NAGALLA, SR JOHNSON, BE SPINDEL, ER TI CLONING AND FUNCTIONAL EXPRESSION OF A CDNA-ENCODING THE HUMAN BOMBESIN GRP RECEPTOR EXPRESSED IN SMALL-CELL LUNG-CARCINOMA SO CLINICAL RESEARCH LA English DT Meeting Abstract C1 OREGON REG PRIMATE RES CTR,DIV NEUROSCI,BEAVERTON,OR 97006. USN HOSP,MOB,NCI NAVY,BETHESDA,MD 20814. NR 0 TC 0 Z9 0 U1 0 U2 0 PU SLACK INC PI THOROFARE PA 6900 GROVE RD, THOROFARE, NJ 08086 USA SN 0009-9279 J9 CLIN RES JI Clin. Res. PD APR PY 1991 VL 39 IS 2 BP A294 EP A294 PG 1 WC Medicine, Research & Experimental SC Research & Experimental Medicine GA FH323 UT WOS:A1991FH32300884 ER PT J AU KARK, JA KARK, RAP ANDERSON, L SALAZAR, AM ESTELLA, E AF KARK, JA KARK, RAP ANDERSON, L SALAZAR, AM ESTELLA, E TI NEUROLOGIC DIAGNOSIS IN EXERTIONAL HEAT ILLNESS SO CLINICAL RESEARCH LA English DT Meeting Abstract C1 WALTER REED ARMY MED CTR,WASHINGTON,DC 20307. USN,MED CLIN BRANCH,MARINE CORP RECRUIT DEPOT,PARRIS ISL,SC. UNIFORMED SERV UNIV HLTH SCI,BETHESDA,MD 20814. NR 0 TC 0 Z9 0 U1 0 U2 0 PU SLACK INC PI THOROFARE PA 6900 GROVE RD, THOROFARE, NJ 08086 USA SN 0009-9279 J9 CLIN RES JI Clin. Res. PD APR PY 1991 VL 39 IS 2 BP A412 EP A412 PG 1 WC Medicine, Research & Experimental SC Research & Experimental Medicine GA FH323 UT WOS:A1991FH32301536 ER PT J AU KARK, JA GARDNER, JW HETZEL, DP JARMULOWICZ, MA LARKIN, TJ FRANCIS, LFD ANDERSON, L ESTELLA, E AF KARK, JA GARDNER, JW HETZEL, DP JARMULOWICZ, MA LARKIN, TJ FRANCIS, LFD ANDERSON, L ESTELLA, E TI FEVER IN CLASSIFICATION OF EXERTIONAL HEAT INJURY SO CLINICAL RESEARCH LA English DT Meeting Abstract C1 WALTER REED ARMY MED CTR,DIV MED,WASHINGTON,DC 20307. BRANCH CLIN,DEPT NURSING,PARRIS ISL,SC. USN HOSP,DEPT INTERNAL MED,BEAUFORT,SC. UNIFORMED SERV UNIV HLTH SCI,BETHESDA,MD 20814. NR 0 TC 0 Z9 0 U1 0 U2 0 PU SLACK INC PI THOROFARE PA 6900 GROVE RD, THOROFARE, NJ 08086 USA SN 0009-9279 J9 CLIN RES JI Clin. Res. PD APR PY 1991 VL 39 IS 2 BP A143 EP A143 PG 1 WC Medicine, Research & Experimental SC Research & Experimental Medicine GA FH323 UT WOS:A1991FH32300011 ER PT J AU MALIK, A EGAN, JE SEDEGAH, M MASON, C HOFFMAN, SL AF MALIK, A EGAN, JE SEDEGAH, M MASON, C HOFFMAN, SL TI IMMUNIZATION OF HUMANS WITH RADIATION ATTENUATED SPOROZOITES INDUCES CYTOTOXIC-T LYMPHOCYTES (CTL) AGAINST THE PLASMODIUM-FALCIPARUM CIRCUMSPOROZOITE PROTEIN SO CLINICAL RESEARCH LA English DT Meeting Abstract C1 USN,BETHESDA,MD. WALTER REED ARMY MED CTR,WASHINGTON,DC 20307. NR 0 TC 0 Z9 0 U1 0 U2 0 PU SLACK INC PI THOROFARE PA 6900 GROVE RD, THOROFARE, NJ 08086 USA SN 0009-9279 J9 CLIN RES JI Clin. Res. PD APR PY 1991 VL 39 IS 2 BP A328 EP A328 PG 1 WC Medicine, Research & Experimental SC Research & Experimental Medicine GA FH323 UT WOS:A1991FH32301059 ER PT J AU THORP, JW SEALE, JL CONWAY, JM RUMPLER, WV HABERMAN, KJ AF THORP, JW SEALE, JL CONWAY, JM RUMPLER, WV HABERMAN, KJ TI ENERGY-EXPENDITURE AND BODY-COMPOSITION IN HEALTHY, FIT MEN SO CLINICAL RESEARCH LA English DT Meeting Abstract C1 USN,MED RES INST,DEPT DIVING MED,BETHESDA,MD 20814. USDA,BHNRC,ENERGY & PROT NUTR LAB,BELTSVILLE,MD 20705. NR 0 TC 0 Z9 0 U1 0 U2 0 PU SLACK INC PI THOROFARE PA 6900 GROVE RD, THOROFARE, NJ 08086 USA SN 0009-9279 J9 CLIN RES JI Clin. Res. PD APR PY 1991 VL 39 IS 2 BP A656 EP A656 PG 1 WC Medicine, Research & Experimental SC Research & Experimental Medicine GA FH323 UT WOS:A1991FH32302975 ER PT J AU ELLZEY, JL LASKEY, KJ ORAN, ES AF ELLZEY, JL LASKEY, KJ ORAN, ES TI A STUDY OF CONFINED DIFFUSION FLAMES SO COMBUSTION AND FLAME LA English DT Article AB A numerical simulation of an axisymmetric confined diffusion flame formed between a H2-N2 jet and coflowing air at 30 cm/s is presented. For the initial computations, the restrictions of the Burke-Schumann theory are imposed and the results of the computation are compared with the analytical solution for flame location. For both the underventilated and overventilated flames, the results of the computations are in excellent agreement with the analytical solution. However, the flame behavior becomes more complex as the restrictions are relaxed. When variable diffusion coefficients and densities are included in the calculation, small radial velocities are induced and the flame interface is slightly distorted. When heat release is included, the flame is shorter and an unsteady mixing region forms at the fuel-oxidizer interface. The instabilities are damped when viscous effects are included. Large-scale instabilities form in the oxidizer region with a frequency of approximately 15-20 Hz when gravity is included in the calculation. C1 USN,RES LAB,COMPUTAT PHYS & FLUID DYNAM LAB,WASHINGTON,DC 20375. NR 21 TC 18 Z9 19 U1 0 U2 4 PU ELSEVIER SCIENCE INC PI NEW YORK PA 655 AVENUE OF THE AMERICAS, NEW YORK, NY 10010 SN 0010-2180 J9 COMBUST FLAME JI Combust. Flame PD APR PY 1991 VL 84 IS 3-4 BP 249 EP 264 DI 10.1016/0010-2180(91)90004-U PG 16 WC Thermodynamics; Energy & Fuels; Engineering, Multidisciplinary; Engineering, Chemical; Engineering, Mechanical SC Thermodynamics; Energy & Fuels; Engineering GA FH433 UT WOS:A1991FH43300004 ER PT J AU CARR, LW CHANDRASEKHARA, MS AF CARR, LW CHANDRASEKHARA, MS TI A STUDY OF COMPRESSIBILITY EFFECTS ON DYNAMIC STALL OF RAPIDLY PITCHING AIRFOILS SO COMPUTER PHYSICS COMMUNICATIONS LA English DT Article AB Results of recent experimental studies into the effect of compressibility on dynamic stall of oscillating airfoils are reviewed. Stroboscopic schlieren images of the strongly unsteady flow field are presented, showing the development of the dynamic stall vortex, and its progression down the airfoil. The effect of varying free-stream Mach number, and frequency of oscillation of the airfoil are demonstrated, and examples of local supersonic flow are presented, including the presence of a shock near the leading edge of the airfoil. C1 USA,AEROFLIGHTDYNAM DIRECTORATE,AVSCOM,MOFFETT FIELD,CA 94035. NASA,NAVAL POSTGRAD SCH,JOINT INST AERONAUT,DEPT AERONAUT & ASTRONAUT,MONTEREY,CA 94943. RP CARR, LW (reprint author), NASA,AMES RES CTR,FLUID MECH LAB,MOFFETT FIELD,CA 94035, USA. NR 9 TC 1 Z9 1 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0010-4655 J9 COMPUT PHYS COMMUN JI Comput. Phys. Commun. PD APR PY 1991 VL 65 IS 1-3 BP 62 EP 68 DI 10.1016/0010-4655(91)90155-E PG 7 WC Computer Science, Interdisciplinary Applications; Physics, Mathematical SC Computer Science; Physics GA FM805 UT WOS:A1991FM80500009 ER PT J AU MARKS, KM SANDWELL, DT VOGT, PR HALL, SA AF MARKS, KM SANDWELL, DT VOGT, PR HALL, SA TI MANTLE DOWNWELLING BENEATH THE AUSTRALIAN-ANTARCTIC DISCORDANCE ZONE - EVIDENCE FROM GEOID HEIGHT VERSUS TOPOGRAPHY SO EARTH AND PLANETARY SCIENCE LETTERS LA English DT Article ID DEPTH ANOMALIES; GRAVITY-ANOMALIES; INDIAN-OCEAN; CONVECTION; SWELLS; CHEMISTRY; SEASAT; RIDGE; COMPENSATION; UNDULATIONS AB The Australian-Antarctic discordance zone (AAD) is an anomalously deep and rough segment of the Southeast Indian Ridge between 120-degrees and 128-degrees-E. A large, negative (deeper than predicted) depth anomaly is centered on the discordance, and a geoid low is evident upon removal of a low-order geoid model and the geoid height-age relation. We investigate two models that may explain these anomalies: a deficiency in ridge-axis magma supply that produces thin oceanic crust (i.e. shallow Airy compensation), and a downwelling and/or cooler mantle beneath the AAD that results in deeper convective-type compensation. To distinguish between these models, we have calculated the ratio of geoid height to topography from the slope of a best line fit by functional analysis (i.e. non-biased linear regression), a method that minimizes both geoid height and topography residuals. Geoid/topography ratios of 2.1 +/- 0.9 m/km for the entire study area (38-degrees-60-degrees-S, 105-degrees-140-degrees-E), 2.3 +/- 1.8 m/km for a subset comprising crust less-than-or-equal-to 25 Ma, and 2.7 +/- 2.0 m/km for a smaller area centered on the AAD were obtained. These ratios are significantly larger than predicted for thin oceanic crust (0.4 m/km), and 2.7 m/km is consistent with downwelling convection beneath young lithosphere. Average compensation depths of 27, 29, and 34 km, respectively, estimated from these ratios suggest a mantle structure that deepens towards the AAD. The deepest compensation (34 km) of the AAD is below the average depth of the base of the young lithosphere (approximately 30 km), and a downwelling of asthenospheric material is implied. The observed geoid height-age slope over the discordance is unusually gradual at -0.133 m/m.y. We calculate that an upper mantle 170-degrees-C cooler and 0.02 g/cm3 denser than normal can explain the shallow slope. Unusually fast shear velocities in the upper 200 km of mantle beneath the discordance, and major-element geochemical trends consistent with small amounts of melting at shallow depths, provide strong evidence for cooler temperatures beneath the AAD. C1 UNIV HOUSTON,DEPT GEOSCI,HOUSTON,TX 77004. UNIV CALIF SAN DIEGO,SCRIPPS INST OCEANOG,LA JOLLA,CA 92093. USN,RES LAB,WASHINGTON,DC 20375. RI Marks, Karen/F-5610-2010; OI Marks, Karen/0000-0001-6524-1495; Sandwell, David/0000-0001-5657-8707 NR 48 TC 26 Z9 26 U1 0 U2 2 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0012-821X J9 EARTH PLANET SC LETT JI Earth Planet. Sci. Lett. PD APR PY 1991 VL 103 IS 1-4 BP 325 EP 338 DI 10.1016/0012-821X(91)90170-M PG 14 WC Geochemistry & Geophysics SC Geochemistry & Geophysics GA FM721 UT WOS:A1991FM72100026 ER PT J AU WU, C AF WU, C TI SPECIFIC OUTPUT POWER OF A DRY GEOTHERMAL PLANT SO ENERGY LA English DT Article AB The specific output of a simple, irreversible, dry geothermal field power plant is analyzed. The plant has a secondary vapor Rankine cycle, which is coupled to the dry geothermal field heating fluid (heat source) and a cooling fluid (heat sink) by heat transfer. An expression is derived for the specific power output of the irreversible geothermal heat engine. The maximum specific power output is found by using computer graphics. RP WU, C (reprint author), USN ACAD,DEPT MECH ENGN,ANNAPOLIS,MD 21402, USA. NR 2 TC 6 Z9 8 U1 0 U2 0 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0360-5442 J9 ENERGY JI Energy PD APR PY 1991 VL 16 IS 4 BP 757 EP 761 DI 10.1016/0360-5442(91)90025-H PG 5 WC Thermodynamics; Energy & Fuels SC Thermodynamics; Energy & Fuels GA EZ892 UT WOS:A1991EZ89200008 ER PT J AU BAGARIA, WJ AF BAGARIA, WJ TI UNDERGRADUATE ASTRONAUTICS AT THE UNITED-STATES-NAVAL-ACADEMY SO ENGINEERING EDUCATION LA English DT Article AB The aerospace engineering curriculum at the U.S. Naval Academy was expanded to include an astronautical engineering track alongside the existing aeronautical track. The objective of the new program is to give students the necessary astronautical engineering background to perform a preliminary spacecraft design during the last semester of the program. RP BAGARIA, WJ (reprint author), USN ACAD,AEROSP ENGN,ANNAPOLIS,MD 21402, USA. NR 0 TC 0 Z9 0 U1 0 U2 1 PU AMER SOC ENG EDUC PI WASHINGTON PA 1818 N STREET,NW SUITE 600, WASHINGTON, DC 20036 SN 0022-0809 J9 ENG EDUC PD APR PY 1991 VL 81 IS 3 BP 386 EP 388 PG 3 WC Education, Scientific Disciplines; Engineering, Multidisciplinary SC Education & Educational Research; Engineering GA FE836 UT WOS:A1991FE83600011 ER PT J AU CAMUSSO, M TARTARI, G ZIRINO, A AF CAMUSSO, M TARTARI, G ZIRINO, A TI MEASUREMENT AND PREDICTION OF COPPER-ION ACTIVITY IN LAKE ORTA, ITALY SO ENVIRONMENTAL SCIENCE & TECHNOLOGY LA English DT Article ID SEAWATER; HYDROLYSIS; PH AB A commercial Cu ion selective electrode (ISE) mounted on a field conductivity, temperature, depth probe (CTD) equipped with pH and oxygen sensors was used to measure a profile of Cu ion activity [a(Cu2+)] in Lake Orta, Italy. Lake Orta water contains approximately 32-34-mu-g L-1 Cu from anthropogenic sources. Below the mixed layer, a(Cu2+) was directly related to the pH of the lake water. In the body of the hypolimnion, measurements of a(Cu2+) were in good agreement with estimates of a(Cu2+) obtained from total Cu concentrations. The pH dependence of the activity/concentration of free Cu2+ was modeled with a simple ion association model of the lake water. The results of the model were verified by a potentiometric titration of a sample of lake water using Cu, pH, and NH3 ISEs. The titration simulated a forthcoming chemical treatment now in progress. C1 USN,CTR OCEAN SYST,CODE 522,SAN DIEGO,CA 92152. CNR,IST RIC ACQUE,I-20047 BRUGHERIO,ITALY. NR 23 TC 11 Z9 11 U1 1 U2 6 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0013-936X J9 ENVIRON SCI TECHNOL JI Environ. Sci. Technol. PD APR PY 1991 VL 25 IS 4 BP 678 EP 683 DI 10.1021/es00016a012 PG 6 WC Engineering, Environmental; Environmental Sciences SC Engineering; Environmental Sciences & Ecology GA FE652 UT WOS:A1991FE65200020 ER PT J AU STROBEL, DF MEIER, RR SUMMERS, ME STRICKLAND, DJ AF STROBEL, DF MEIER, RR SUMMERS, ME STRICKLAND, DJ TI NITROGEN AIRGLOW SOURCES - COMPARISON OF TRITON, TITAN, AND EARTH SO GEOPHYSICAL RESEARCH LETTERS LA English DT Article ID UPPER-ATMOSPHERE; MODEL; EUV; VOYAGER-1; EMISSION; NEPTUNE AB Detailed calculations of the emission rates of nitrogen airglow in the upper atmospheres of Triton and Titan by direct solar excitation, photoelectrons, and magnetospheric electrons are compared with the Voyager Ultra-violet Spectrometer (UVS) observations. The principal spectral features of Triton's airglow are shown to be consistent with precipitation of magnetospheric electrons with power dissipation approximately 5 x 10(8) W. Solar excitation rates of the dominant N2 and N+ emission features are factors of 2-7 weaker than magnetospheric electron excitation. On Titan the calculated disk center and bright limb N+ (1085 angstrom) intensities by solar excitation agree with observed values, whereas if the 970 angstrom feature is mostly N2 c4 band emission, the calculated photoelectron excitation intensity is only 40% of the observed value. The difference could be due to magnetospheric electron precipitation. But the calculated LBH intensity by photoelectrons is in agreement with observations and suggests that magnetospheric electrons play a minor role in Titan's UV airglow. On the Earth solar/photoelectron excitation explains the observed N+ (1085 angstrom) and LBH intensities, accounts for only 40% of the N+ (916 angstrom) intensity, and overpredicts substantially the N2 c4 (0-0) band intensity. C1 USN,RES LAB,EO HULBURT CTR SPACE RES,WASHINGTON,DC 20375. RP STROBEL, DF (reprint author), JOHNS HOPKINS UNIV,DEPT EARTH & PLANETARY SCI,DEPT PHYS & ASTRON,BALTIMORE,MD 21218, USA. RI Meier, Robert/G-4749-2014 OI Meier, Robert/0000-0001-8497-7115 NR 20 TC 41 Z9 41 U1 0 U2 2 PU AMER GEOPHYSICAL UNION PI WASHINGTON PA 2000 FLORIDA AVE NW, WASHINGTON, DC 20009 SN 0094-8276 J9 GEOPHYS RES LETT JI Geophys. Res. Lett. PD APR PY 1991 VL 18 IS 4 BP 689 EP 692 DI 10.1029/91GL00133 PG 4 WC Geosciences, Multidisciplinary SC Geology GA FG828 UT WOS:A1991FG82800029 ER PT J AU LERMAN, MI LATIF, F GLENN, GM DANIEL, LN BRAUCH, H HOSOE, S HAMPSCH, K DELISIO, J ORCUTT, ML MCBRIDE, OW GRZESCHIK, KH TAKAHASHI, T MINNA, J ANGLARD, P LINEHAN, WM ZBAR, B AF LERMAN, MI LATIF, F GLENN, GM DANIEL, LN BRAUCH, H HOSOE, S HAMPSCH, K DELISIO, J ORCUTT, ML MCBRIDE, OW GRZESCHIK, KH TAKAHASHI, T MINNA, J ANGLARD, P LINEHAN, WM ZBAR, B TI ISOLATION AND REGIONAL LOCALIZATION OF A LARGE COLLECTION (2,000) OF SINGLE-COPY DNA FRAGMENTS ON HUMAN CHROMOSOME-3 FOR MAPPING AND CLONING TUMOR SUPPRESSOR GENES SO HUMAN GENETICS LA English DT Article ID RENAL-CELL CARCINOMA; VONHIPPEL-LINDAU DISEASE; LINKAGE MAP; LUNG-CANCER; SHORT ARM; LIBRARIES; PROBES; CONSTRUCTION; DELETION; ACID AB A collection of 2,000 lambda phage-carrying human single-copy inserts (> 700 bp) were isolated from two chromosome-3 flow-sorted libraries. The single-copy DNA fragments were first sorted into 3p and 3q locations and about 700 3p fragments were regionally mapped using a deletion mapping panel comprised of two human-hamster and two-human-mouse cell hybrids, each containing a chromosome 3 with different deletions in the short arm. The hybrids were extensively mapped with a set of standard 3p markers physically localized or ordered by linkage. The deletion mapping panel divided the short arm into five distinct subregions (A-E). The 3p fragments were distributed on 3p regions as follows: region A, 26%; B, 31%; C, 4%; D, 4% and E, 35%. We screened 300 single-copy DNA fragments from the distal part of 3p (regions A and B) with ten restriction endonucleases for their ability to detect restriction fragment length polymorphisms (RFLPs). Of these fragments 110 (36%) were found to detect useful RFLPs: 35% detected polymorphisms with frequency of heterozygosity of 40% or higher, and 25% with frequency of 30% or higher. All polymorphisms originated from single loci and most of them were of the base pair substitution type. These RFLP markers make it possible to construct a fine linkage map that will span the distal part of chromosome 3p and encompasses the von Hippel-Lindau disease locus. The large number of single-copy fragments (2,000) spaced every 100-150 kb on chromosome 3 will make a significant contribution to mapping and sequencing the entire chromosome 3. The 300 conserved chromosome 3 probes will increase the existing knowledge of man-mouse homologies. C1 PROGRAM RESOURCES INC,FREDERICK CANC RES FACIL,FREDERICK,MD 21701. NCI,BIOCHEM LAB,BETHESDA,MD 20892. UNIV MARBURG,INST HUMAN GENET,W-3550 MARBURG,GERMANY. USN HOSP,NCI,MED ONCOL BRANCH,BETHESDA,MD 20814. NCI,SURG BRANCH,UROL ONCOL SECT,BETHESDA,MD 20892. RP LERMAN, MI (reprint author), NCI,FREDERICK CANC RES FACIL,IMMUNOBIOL LAB,BLDG 560,ROOM 12-71,FREDERICK,MD 21701, USA. RI Takahashi, Takashi/I-7262-2014 NR 61 TC 63 Z9 57 U1 1 U2 6 PU SPRINGER VERLAG PI NEW YORK PA 175 FIFTH AVE, NEW YORK, NY 10010 SN 0340-6717 J9 HUM GENET JI Hum. Genet. PD APR PY 1991 VL 86 IS 6 BP 567 EP 577 PG 11 WC Genetics & Heredity SC Genetics & Heredity GA FH810 UT WOS:A1991FH81000006 PM 1673958 ER PT J AU RABINOVICH, WS BOWMAN, SR FELDMAN, BJ WININGS, MJ AF RABINOVICH, WS BOWMAN, SR FELDMAN, BJ WININGS, MJ TI TUNABLE LASER PUMPED 3-MU-M HO-YALO3 LASER SO IEEE JOURNAL OF QUANTUM ELECTRONICS LA English DT Article AB The tuning characteristics of the 5I6-5I7 transition in an Ho:YAlO3 laser, intracavity pumped by a 1.079-mu-m Nd:YAlO3 laser, were studied. Operation on seven distinct lines between 2.844 and 3.017-mu-m was found, and the threshold and relative slope efficiency of each line was measured. Several of these lines were previously unreported. C1 SEA INC,LANDOVER,MD 20785. RP RABINOVICH, WS (reprint author), USN,RES LAB,LASER PHYS BRANCH,CODE 6540,WASHINGTON,DC 20375, USA. RI Winings, Michael/A-4924-2010 NR 9 TC 12 Z9 15 U1 5 U2 11 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 APR PY 1991 VL 27 IS 4 BP 895 EP 897 DI 10.1109/3.83322 PG 3 WC Engineering, Electrical & Electronic; Optics; Physics, Applied SC Engineering; Optics; Physics GA FU104 UT WOS:A1991FU10400008 ER PT J AU DULING, IN MOELLER, RP BURNS, WK VILLARRUEL, CA GOLDBERG, L SNITZER, E PO, H AF DULING, IN MOELLER, RP BURNS, WK VILLARRUEL, CA GOLDBERG, L SNITZER, E PO, H TI OUTPUT CHARACTERISTICS OF DIODE PUMPED FIBER ASE SOURCES SO IEEE JOURNAL OF QUANTUM ELECTRONICS LA English DT Article ID LASER; BACKSCATTERING; 1060-NM AB High power amplified spontaneous emission (ASE) from multicore Nd:fibers pumped by laser diode arrays is investigated experimentally and theoretically. Particular examination is made of threshold conditions at which lasing occurs. A model is presented which describes output power for arbitrary end reflectors. Experimental measurements of lasing threshold reflectivity versus pump power are made and are shown to deviate from the usual laser threshold condition at high pump powers. It is demonstrated that feedback from Rayleigh backscattering can be sufficient to drive the ASE source above lasing threshold in certain configurations. C1 POLAROID CORP,CAMBRIDGE,MA 02139. RUTGERS STATE UNIV,PISCATAWAY,NJ 08855. RP DULING, IN (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 12 TC 27 Z9 27 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 0018-9197 J9 IEEE J QUANTUM ELECT JI IEEE J. Quantum Electron. PD APR PY 1991 VL 27 IS 4 BP 995 EP 1003 DI 10.1109/3.83334 PG 9 WC Engineering, Electrical & Electronic; Optics; Physics, Applied SC Engineering; Optics; Physics GA FU104 UT WOS:A1991FU10400021 ER PT J AU PETRIN, RR KLIEWER, ML BEASLEY, JT POWELL, RC AGGARWAL, ID GINTHER, RC AF PETRIN, RR KLIEWER, ML BEASLEY, JT POWELL, RC AGGARWAL, ID GINTHER, RC TI SPECTROSCOPY AND LASER OPERATION OF ND-ZBAN GLASS SO IEEE JOURNAL OF QUANTUM ELECTRONICS LA English DT Article ID ZRF4-BASED FLUORIDE GLASS; EMISSION; YLF AB The results of a study of the spectroscopic and laser properties of a Nd3+ doped fluoride glass are presented. Threshold energies and slope efficiencies are reported along with the stimulated emission cross section for the laser transition. The effect of excited state absorption of pump photons on the slope efficiency is investigated. C1 USN,RES LAB,WASHINGTON,DC 20375. RP PETRIN, RR (reprint author), OKLAHOMA STATE UNIV,CTR LASER RES,STILLWATER,OK 74078, USA. NR 21 TC 25 Z9 25 U1 0 U2 5 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 APR PY 1991 VL 27 IS 4 BP 1031 EP 1038 DI 10.1109/3.83338 PG 8 WC Engineering, Electrical & Electronic; Optics; Physics, Applied SC Engineering; Optics; Physics GA FU104 UT WOS:A1991FU10400025 ER PT J AU CARROLL, TL PECORA, LM AF CARROLL, TL PECORA, LM TI SYNCHRONIZING CHAOTIC CIRCUITS SO IEEE TRANSACTIONS ON CIRCUITS AND SYSTEMS LA English DT Note AB Although the motions of independent chaotic systems are uncorrelated with each other, it is possible under some conditions to synchronize a subsystem of one chaotic system with a separate chaotic system by sending a signal from the chaotic system to the subsystem. We describe here the conditions necessary for synchronization and demonstrate synchronization with a chaotic circuit. C1 USN,RES LAB,WASHINGTON,DC 20375. RP CARROLL, TL (reprint author), SACHS FREEMAN ASSOCIATES INC,LANDOVER,MD 20785, USA. OI Carroll, Thomas/0000-0002-2371-2049 NR 10 TC 864 Z9 925 U1 1 U2 11 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0098-4094 J9 IEEE T CIRCUITS SYST PD APR PY 1991 VL 38 IS 4 BP 453 EP 456 DI 10.1109/31.75404 PG 4 WC Engineering, Electrical & Electronic SC Engineering GA FD910 UT WOS:A1991FD91000013 ER PT J AU MORAN, SL HARDESTY, LW AF MORAN, SL HARDESTY, LW TI HIGH-REPETITION-RATE HYDROGEN SPARK GAP SO IEEE TRANSACTIONS ON ELECTRON DEVICES LA English DT Article AB The Naval Surface Warfare Center has been studying the recovery of pressurized spark-gap switches for several years. A two-pulse technique has been used in which the first pulse breaks down the gap and the second is used to determine recovery. For an unblown spark gap triggered near self-break, typical recovery times are about 10 ms for most gases such as air, nitrogen, and SF6. We have found that using hydrogen gas, with its high thermal diffusivity, allows the recovery time to be an order of magnitude faster, or about 1 ms. Recovery of the switch can be made even faster by triggering the switch well below self-break. Recovery time can be decreased by making the operating voltage significantly less than the dc breakdown voltage, allowing voltage to be re-applied while the gas is still hot. Tests with hydrogen have shown that recovery times (to the operating voltage) can be further reduced an order of magnitude when the gap is undervolted by approximately 50%. Recent tests have demonstrated, for the first time, 100-mu-s recovery of an unblown spark gap using high-pressure hydrogen in a trigatron configuration. Tests were performed in 1987 at 120 kV, 200 A, at 5 J of energy. In 1988 recovery was demonstrated at 60 kV, 35 kA, 200 J using a 200-ns pulse-forming line where voltage was re-applied in a 1-cos waveform (resonant charge) during the entire recovery period. In 1989 recovery at high energies was demonstrated at 50 kV, 170 kA, 12.5 kJ with 15-mu-s pulses. Plans are underway to test the switch at 600 kV. RP MORAN, SL (reprint author), USN,CTR SURFACE WARFARE,DAHLGREN LAB,CODE F-45,DAHLGREN,VA 22448, USA. NR 8 TC 36 Z9 45 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 APR PY 1991 VL 38 IS 4 BP 726 EP 730 DI 10.1109/16.75197 PG 5 WC Engineering, Electrical & Electronic; Physics, Applied SC Engineering; Physics GA FC049 UT WOS:A1991FC04900010 ER PT J AU RIEL, G RAO, N KERSCHNER, H NELSON, M AF RIEL, G RAO, N KERSCHNER, H NELSON, M TI SUPERHEATED DROP, BUBBLE, NEUTRON DOSIMETER PERFORMANCE IN A WORK-ENVIRONMENT SO IEEE TRANSACTIONS ON NUCLEAR SCIENCE LA English DT Article AB Bubble dosimeters offer a unique combination of sensitivity, immediate results, and dose equivalent response, but their use has been limited by temperature and vibration. To determine their practicality, we simulated a large operation in an air conditioned radiation work environment. We tested 120 devices of three types. The batch homogeneity and reproducibility were about 20%, and the lower limit of detection was about 10-mu-Sv (1 mrem). The dose equivalent indicated by bubble dosimeters agreed with remmeters and spectrometers more closely than did the dose indicated by conventional dosimeters. C1 USN,MSC,WASHINGTON,DC 20372. USN ACAD,ANNAPOLIS,MD 21401. RP RIEL, G (reprint author), NAVSWC,WHITE OAK,MD 20903, USA. NR 7 TC 2 Z9 2 U1 0 U2 0 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0018-9499 J9 IEEE T NUCL SCI JI IEEE Trans. Nucl. Sci. PD APR PY 1991 VL 38 IS 2 BP 494 EP 496 DI 10.1109/23.289346 PN 1 PG 3 WC Engineering, Electrical & Electronic; Nuclear Science & Technology SC Engineering; Nuclear Science & Technology GA FK173 UT WOS:A1991FK17300079 ER PT J AU KING, SE PHILLIPS, GW AUGUST, RA RITTER, JC CUTCHIN, JH HASKINS, PS MCKISSON, JE ELY, DW WEISENBERGER, AG PIERCEY, RB DYBLER, T AF KING, SE PHILLIPS, GW AUGUST, RA RITTER, JC CUTCHIN, JH HASKINS, PS MCKISSON, JE ELY, DW WEISENBERGER, AG PIERCEY, RB DYBLER, T TI RADIATION SURVEY OF THE LDEF SPACECRAFT SO IEEE TRANSACTIONS ON NUCLEAR SCIENCE LA English DT Article AB We report the first complete gamma-ray survey of a large spacecraft, the Long Duration Exposure Facility (LDEF). The survey was conducted using an array of germanium detectors from the U.S. Naval Research Laboratory (NRL) and individual detectors from the Institute for Space Science and Technology (ISST) to study the accumulation and distribution of radioisotopes induced in the wide variety of materials present on LDEF. Na-22, Be-7, Mn-54, and the positron annihilation line were all strongly observed. Also observed were traces of Co-58, Co-57, and Co-60. The most striking feature of the data was the unexpected distribution of Be-7, which was predominately observed on the leading surfaces of the spacecraft. The evidence clearly indicates an accretion of the Be-7 onto the surface of the LDEF. This is the first known observation of the deposition of a radioisotope onto the surface of a spacecraft. Be-7 is a spallation product of cosmic rays on nitrogen and oxygen in the upper atmosphere[1]. To explain the surface density of 5.4 x 10(5) atoms/cm2, the light Be-7 atom must be transported up from lower altitudes. C1 SACHS FREEMAN ASSOCIATES INC,LANDOVER,MD. UNIV FLORIDA,GAINESVILLE,FL 32611. INST SPACE SCI & TECHNOL,GAINESVILLE,FL. MISSISSIPPI STATE UNIV,MISSISSIPPI STATE,MS 39762. RP KING, SE (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 8 TC 0 Z9 0 U1 0 U2 0 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0018-9499 J9 IEEE T NUCL SCI JI IEEE Trans. Nucl. Sci. PD APR PY 1991 VL 38 IS 2 BP 525 EP 530 DI 10.1109/23.289354 PN 1 PG 6 WC Engineering, Electrical & Electronic; Nuclear Science & Technology SC Engineering; Nuclear Science & Technology GA FK173 UT WOS:A1991FK17300085 ER PT J AU BECKER, CAL COOPER, JC AF BECKER, CAL COOPER, JC TI SYNTHESIS, CHARACTERIZATION AND MOLECULAR-STRUCTURE OF TETRAKIS(2,6-DIETHYLPHENYLISOCYANIDE)BIS(PERCHLORATO)COBALT(II) - AN EXAMPLE OF DISSIMILARITY BETWEEN PERCHLORATE AND TETRAFLUOROBORATE SALTS SO INORGANICA CHIMICA ACTA LA English DT Article ID TRIARYLPHOSPHINE SUBSTITUTION; PENTAKIS(ARYLISOCYANIDE)COBALT(I); ISOCYANIDE)COBALT(II) AB Reaction of 2,6-Et2C6H3NC in 5:1 mole ratio with Co(II) produces Co(CNR)5X2.H2O, R = 2,6-Et2C6H3; X = ClO4, BF4; but the perchlorate salt spontaneously decomposes in solid state to Co(CNR)4(ClO4)2. The species Co(CNR)4(ClO4)2 was determined by X-ray crystallography to contain equivalent, monodentate, trans-coordinated perchlorate ions with average Co-O bond length 2.266(7) angstrom, and inequivalent arylisocyanide ligands with average Co-C bond lengths 1.896(13) and 1.887(11) angstrom in approximately square planar coordination (C-Co-C bond angles 87.8(4) and 92.2(4)-degrees, i.e. trans-[Co(CNR)4(ClO4)2]. Inequivalency of the arylisocyanides is achieved primarily through different tilt of the phenyl rings relative to the CoC4 plane and location of the perchlorates directly above or below one pair of CNR. The complex crystallizes in triclinic space group P1BAR with a = 11.550(3), b = 13.464(4), c = 15.684(3) angstrom, alpha = 77.39(2), beta = 68.43(2), gamma = 86.17(3)-degrees. Final discrepancy values of R = 0.0726 (R(w) = 0.0573) were obtained from 3723 unique, observed reflections. Solid state physical properties (IR, diffuse reflectance and magnetic susceptibility) are compared for [Co(CNR)4(ClO4)2] and [Co(CNR)5](BF4)2.H2O. Previously reported [Co(CNC6H3Me2-2,6)4](ClO4)2 should now be formulated as trans-[Co(CNC6H3Me2-2,6)4(ClO4)2], but the tetrafluoroborate ions in both Co(CNC6H3Et2-2,6)5(BF4)2.H2O and Co(CNC6H3Me2-2,6)5(BF4)2.0.5H2O are probably ionic. C1 USN,RES LAB,DIV CHEM,WASHINGTON,DC 20375. RP BECKER, CAL (reprint author), UNIV BAHRAIN,DEPT CHEM,POB 32038,ISA TOWN,BAHRAIN. NR 28 TC 20 Z9 20 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 APR 1 PY 1991 VL 182 IS 1 BP 25 EP 32 DI 10.1016/S0020-1693(00)85182-8 PG 8 WC Chemistry, Inorganic & Nuclear SC Chemistry GA FQ489 UT WOS:A1991FQ48900005 ER PT J AU SINGH, A GRANATSTEIN, VL HAZEL, G SARAPH, G COOPERSTEIN, JM HARGREAVES, T AF SINGH, A GRANATSTEIN, VL HAZEL, G SARAPH, G COOPERSTEIN, JM HARGREAVES, T TI A DEPRESSED COLLECTOR SYSTEM FOR A QUASI-OPTICAL GYROTRON WITH PRECISELY CONTROLLED MAGNETIC-FLUX LINES SO INTERNATIONAL JOURNAL OF INFRARED AND MILLIMETER WAVES LA English DT Article AB Design of a depressed collector system for a quasi-optical gyrotron, which had a severe constraint on the maximum allowable radius of the collector region is outlined. The needs for unwinding of spent beam and for energy sorting could be accommodated by precise control of the magnetic field profile, especially in the collector region. Techniques used for defining and obtaining such profiles; and for dovetailing the profile with the collector geometry are discussed. Results on profiles and electron trajectories are presented, which demonstrate the feasibility of the design. From primary electron trajectories a collector efficiency of up to 68% has been calculated for a three collector design. C1 USN,RES LAB,WASHINGTON,DC 20375. UNIV MICHIGAN,ANN ARBOR,MI 48109. RP SINGH, A (reprint author), UNIV MARYLAND,PLASMA RES LAB,COLLEGE PK,MD 20742, USA. NR 6 TC 2 Z9 2 U1 0 U2 1 PU PLENUM PUBL CORP PI NEW YORK PA 233 SPRING ST, NEW YORK, NY 10013 SN 0195-9271 J9 INT J INFRARED MILLI JI Int. J. Infrared Millimeter Waves PD APR PY 1991 VL 12 IS 4 BP 323 EP 334 DI 10.1007/BF01009406 PG 12 WC Engineering, Electrical & Electronic; Optics; Physics, Applied SC Engineering; Optics; Physics GA FF935 UT WOS:A1991FF93500002 ER PT J AU HOUSH, CS SELBERG, BP ROKHSAZ, K AF HOUSH, CS SELBERG, BP ROKHSAZ, K TI AERODYNAMIC CHARACTERISTICS OF SCISSOR-WING GEOMETRIES SO JOURNAL OF AIRCRAFT LA English DT Article AB A scissor-wing configuration, consisting of two independently sweeping-wing surfaces, is compared with an equivalent fixed-wing geometry baseline over a wide Mach number range. The scissor-wing configuration is shown to have a higher total lift-to-drag ratio than the baseline in the subsonic region primarily due to the slightly higher aspect ratio of the unswept scissor wing. In the transonic region, the scissor wing is shown to have a higher lift-to-drag ratio than the baseline for values of lift coefficient > 0.35. It is also shown that, through the use of wing decalage, the lift of the two independent scissor wings can be equalized. In the supersonic regime, the zero lift wave drag of the scissor wing at maximum sweep is shown to be 50 and 28% less than the zero lift wave drag of the baseline at Mach numbers 1.5 and 3.0, respectively. In addition, a pivot-wing configuration is introduced and compared with the scissor wing. The pivot-wing configuration is shown to have a slightly higher total lift-to-drag ratio than the scissor wing in the supersonic region due to the decreased zero lift wave drag of the pivot-wing configuration. RP HOUSH, CS (reprint author), USN,CTR WEAP,CHINA LAKE,CA 93555, USA. NR 0 TC 0 Z9 0 U1 0 U2 1 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 APR PY 1991 VL 28 IS 4 BP 231 EP 238 PG 8 WC Engineering, Aerospace SC Engineering GA FQ806 UT WOS:A1991FQ80600002 ER PT J AU MURPHEY, BB HARE, T HOGAN, AW LIESER, K TOMAN, J WOODGATES, T AF MURPHEY, BB HARE, T HOGAN, AW LIESER, K TOMAN, J WOODGATES, T TI VERNAL ATMOSPHERIC MIXING IN THE ANTARCTIC SO JOURNAL OF APPLIED METEOROLOGY LA English DT Article ID POLAR STRATOSPHERIC CLOUDS; SOUTH-POLE; TEMPORAL VARIATIONS; WATER-VAPOR; OZONE; CRYSTALS; ELEMENTS; AEROSOLS AB Aerosol concentration, ozone concentration, and meteorological parameters were measured at McMurdo and South Pole stations during a spring storm that reached the Antarctic interior. Nacreous clouds were sighted preceding the storm indicative of stratospheric flow from lower latitudes. These measurements and observations, along with upper-air and surface analyses indicate that vigorous tropospheric/stratospheric exchange of air occurs near 75-degreess-S during the spring. The elemental composition of collected aerosol changed coincidently with different stages of the storm. During the storm event in September 1983, surface ozone concentration varied from 20 to more than 100 ppbv at McMurdo, but remained less than 20 ppbv at the South Pole indicating that deep mixing, which occurred at the periphery of Antarctica during the spring storm, did not continue over the interior of the continent. The warm marine air associated with the spring coastal storm infiltrated the interior of Antarctica including the Polar Plateau, producing a record surface temperature and an aerosol concentration twice the September mean. This system was unusual as the warm front apparently reached the surface of South Pole. Crustal material was transported to the periphery of Antarctica through the upper troposphere or lower stratosphere. Enhanced aerosol concentration was transported to the South Pole through the lower troposphere. Vigorous exchange occurred at latitudes of greater than 78-degrees-S, which probably exchanged both marine aerosol and water vapor into the lower stratosphere. C1 WHITEFACE MT FIELD STN,ATMOSPHER SCI RES CTR,WILMINGTON,NY. EF FULLAM ASSOCIATES,SCHENECTADY,NY. US COLD REG RES ENVIRONM LAB,HANOVER,NH. SUNY ALBANY,ATMOSPHER SCI RES CTR,ALBANY,NY 12222. USN,SUPPORT FORCE ANTARCTIC WEATHER DETACHMENT,OPERAT DEEP FREEZE,WASHINGTON,DC 20350. RP MURPHEY, BB (reprint author), GEORGIA INST TECHNOL,SCH EARTH & ATMOSPHER SCI,ATLANTA,GA 30332, USA. NR 54 TC 2 Z9 2 U1 0 U2 1 PU AMER METEOROLOGICAL SOC PI BOSTON PA 45 BEACON ST, BOSTON, MA 02108-3693 SN 0894-8763 J9 J APPL METEOROL JI J. Appl. Meteorol. PD APR PY 1991 VL 30 IS 4 BP 494 EP 507 DI 10.1175/1520-0450(1991)030<0494:VAMITA>2.0.CO;2 PG 14 WC Meteorology & Atmospheric Sciences SC Meteorology & Atmospheric Sciences GA FL199 UT WOS:A1991FL19900008 ER PT J AU JONES, HD ZERILLI, FJ AF JONES, HD ZERILLI, FJ TI THEORETICAL EQUATION OF STATE FOR ALUMINIZED NITROMETHANE SO JOURNAL OF APPLIED PHYSICS LA English DT Article ID STATISTICAL MECHANICAL THEORY; SUBSTITUTED METHANE COMPOUNDS; REACTING MULTIPHASE MIXTURES; SHOCK COMPRESSION DATA; P-V-T; REPULSIVE FORCES; SIMPLE LIQUIDS; DETONATION PROPERTIES; VELOCITY-MEASUREMENTS; CARBON-MONOXIDE AB The simple fluid constituents of the reaction products of an aluminized nitromethane explosive are described by a perturbation technique based on their intermolecular interactions. Liquid metal constituents are treated with a Grover scaling model. Standard solid-state approaches are applied to the solid components of the reaction products. Calculated detonation velocities compared favorably with experimental data. RP USN, CTR SURFACE WARFARE, DEPT RES & TECHNOL, SILVER SPRING, MD 20903 USA. NR 52 TC 15 Z9 15 U1 0 U2 3 PU AMER INST PHYSICS PI MELVILLE PA 1305 WALT WHITMAN RD, STE 300, MELVILLE, NY 11747-4501 USA SN 0021-8979 EI 1089-7550 J9 J APPL PHYS JI J. Appl. Phys. PD APR 1 PY 1991 VL 69 IS 7 BP 3893 EP 3900 DI 10.1063/1.348447 PG 8 WC Physics, Applied SC Physics GA FH033 UT WOS:A1991FH03300018 ER PT J AU GOLDMAN, G WELBOURN, R KLAUSNER, JM KOBZIK, L VALERI, CR SHEPRO, D HECHTMAN, HB AF GOLDMAN, G WELBOURN, R KLAUSNER, JM KOBZIK, L VALERI, CR SHEPRO, D HECHTMAN, HB TI NEUTROPHIL ACCUMULATIONS DUE TO PULMONARY THROMBOXANE SYNTHESIS MEDIATE ACID ASPIRATION INJURY SO JOURNAL OF APPLIED PHYSIOLOGY LA English DT Article DE THROMBOXANE SYNTHASE INHIBITOR; BRONCHOALVEOLAR LAVAGE; DIAPEDESIS; PERMEABILITY ID ADHESION MOLECULE; ISCHEMIA; GLYCOPROTEIN; ACTIVATION; DEPENDENCE; BURST; LFA-1 AB Acid aspiration leads to lung injury associated with high levels of plasma thromboxane (Tx). This study tests the role of Tx synthesis by the aspirated lung segment in mediating local and remote neutrophil (PMN) sequestration, alveolar diapedesis, and permeability edema. Anesthetized rats underwent tracheostomy and insertion of a fine-bore cannula into the anterior segment of the left lung. This was followed by the installation of either 0.1 ml saline (n = 18) or the Tx synthase inhibitor OKY 046 (0.1 mg/kg in 0.1 ml, n = 18). Twenty minutes later either 0.1 ml 0.1 N HCl or 0.1 ml saline was similarly introduced (n = 18). Three hours later, in the saline-HCl group, the rise in Tx concentration in both plasma (1,340 pg/ml) and bronchoalveolar lavage (BAL) fluid (2,100 pg/ml) was higher than that in the saline-saline aspirated control group (350 and 115 pg/ml, respectively; both P < 0.05). In the acid-aspirated lung PMN sequestration [87 PMN/10 high-power fields (HPF)] and diapedesis (96 x 10(4) PMN/ml in BAL) were higher than control values of 7 PMN/10 HPF and 3 x 10(4) PMN/ml (both P < 0.05). Acid aspiration induced local permeability edema with a high protein concentration in BAL of 3,350-mu-g/ml and an increase in lung wet-to-dry weight ratio (W/D) of 6.6, both higher than control values of 482-mu-g/ml and 3.4, respectively (P < 0.05). Leukosequestration in the aspirated side started at 30 min and was progressive over a 3-h monitoring period. This was not true of PMN diapedesis, which began 2 h after aspiration, and TxB2 synthesis, noted after 2.5 h. At 3 h, a correlation was found (P < 0.05) between PMN accumulations and Tx concentration in BAL (r = 0.95). Pretreatment by aspiration with OKY 046 prevented the acid aspiration-induced rise in BAL Tx (140 pg/ml) but not plasma Tx (1,800 pg/ml). PMN sequestration in the aspirated segment was reduced to 27 PMN/10 HPF and diapedesis to 19 x 10(4) PMN/ml (P < 0.05). Permeability edema was attenuated with protein concentration of 1,475-mu-g/ml and lung W/D of 4.1 (P < 0.05). Leukosequestration and permeability edema in the nonaspirated lung segments were not altered by localized OKY 046. These data indicate that after acid aspiration local pulmonary Tx synthesis is required for local PMN sequestration and lung permeability. C1 BRIGHAM & WOMENS HOSP,DEPT SURG,75 FRANCIS ST,BOSTON,MA 02115. BRIGHAM & WOMENS HOSP,DEPT PATHOL,BOSTON,MA 02115. HARVARD UNIV,SCH MED,BOSTON,MA 02115. USN,BLOOD RES LAB,BOSTON,MA. BOSTON UNIV,CTR BIOL SCI,BOSTON,MA 02215. FU NHLBI NIH HHS [HL-16714-13]; NIGMS NIH HHS [GM-24891-11, GM-35141-03] NR 30 TC 30 Z9 30 U1 0 U2 0 PU AMER PHYSIOLOGICAL SOC PI BETHESDA PA 9650 ROCKVILLE PIKE, BETHESDA, MD 20814 SN 8750-7587 J9 J APPL PHYSIOL JI J. Appl. Physiol. PD APR PY 1991 VL 70 IS 4 BP 1511 EP 1517 PG 7 WC Physiology; Sport Sciences SC Physiology; Sport Sciences GA FF832 UT WOS:A1991FF83200012 PM 2055829 ER PT J AU CELII, FG THORSHEIM, HR BUTLER, JE AF CELII, FG THORSHEIM, HR BUTLER, JE TI DETECTION OF ATOMIC NITROGEN BY 3RD HARMONIC-GENERATION SO JOURNAL OF CHEMICAL PHYSICS LA English DT Note ID ENHANCED MULTIPHOTON IONIZATION; MULTI-PHOTON IONIZATION; 3RD-HARMONIC GENERATION; N(2D); HYDROGEN; XENON; GAS C1 USN,RES LAB,DIV CHEM,WASHINGTON,DC 20375. RI Butler, James/B-7965-2008 OI Butler, James/0000-0002-4794-7176 NR 25 TC 1 Z9 1 U1 0 U2 1 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0021-9606 J9 J CHEM PHYS JI J. Chem. Phys. PD APR 1 PY 1991 VL 94 IS 7 BP 5248 EP 5249 DI 10.1063/1.460507 PG 2 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA FF820 UT WOS:A1991FF82000063 ER PT J AU MURDOCK, JW KEYSER, DR AF MURDOCK, JW KEYSER, DR TI THEORETICAL BASIS FOR EXTRAPOLATION OF CALIBRATION DATA OF PTC 6 THROAT TAP NOZZLES SO JOURNAL OF ENGINEERING FOR GAS TURBINES AND POWER-TRANSACTIONS OF THE ASME LA English DT Article AB Equations for the extrapolation of calibration data for ASME/PTC 6 throat tap nozzles are derived from boundary layer theory. The results match published coefficients with a maximum difference of + 0.03 percent. It is also shown that the effects of transition in the boundary layer extend to throat Reynolds numbers in excess of 10,000,000, far beyond the capacity of any known calibration laboratory. The present PTC 6 requirement that calibration data must be in the fully turbulent range cannot be met with current facilities. C1 USN,WARMINSTER,PA 18974. RP MURDOCK, JW (reprint author), DREXEL UNIV,PHILADELPHIA,PA 19104, USA. NR 9 TC 4 Z9 4 U1 0 U2 0 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 APR PY 1991 VL 113 IS 2 BP 228 EP 232 DI 10.1115/1.2906549 PG 5 WC Engineering, Mechanical SC Engineering GA FK198 UT WOS:A1991FK19800009 ER PT J AU MURDOCK, JW KEYSER, DR AF MURDOCK, JW KEYSER, DR TI A METHOD FOR THE EXTRAPOLATION OF CALIBRATION DATA OF PTC-6 THROAT TAP NOZZLES SO JOURNAL OF ENGINEERING FOR GAS TURBINES AND POWER-TRANSACTIONS OF THE ASME LA English DT Article AB This paper describes a precise method for extrapolating the coefficient of discharge of PTC 6 throat tap nozzles using all or most of the calibration data. The theoretical basis for this method is described in a parallel paper [3]. Numerical examples are given using actual calibration data to describe this method. Because this method permits the use of all calibration data at or above Reynolds numbers of 1,000,000, it is a clear improvement over the PTC 6-1976 method, which permits only the highest single point. C1 USN,WARMINSTER,PA 18974. RP MURDOCK, JW (reprint author), DREXEL UNIV,PHILADELPHIA,PA 19104, USA. NR 4 TC 0 Z9 0 U1 0 U2 0 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 APR PY 1991 VL 113 IS 2 BP 233 EP 241 DI 10.1115/1.2906550 PG 9 WC Engineering, Mechanical SC Engineering GA FK198 UT WOS:A1991FK19800010 ER PT J AU KANG, YH KEDAR, VP MAHESHWARI, RK AF KANG, YH KEDAR, VP MAHESHWARI, RK TI THROMBIN STIMULATION OF SYNTHESIS AND SECRETION OF FIBRONECTIN BY HUMAN-A549 EPITHELIAL-CELLS AND MOUSE LB FIBROBLASTS SO JOURNAL OF HISTOCHEMISTRY & CYTOCHEMISTRY LA English DT Article DE THROMBIN; FIBRONECTIN; FIBROBLAST; EPITHELIAL CELL; IMMUNOCYTOCHEMISTRY; IMMUNOPRECIPITATION ID HUMAN-ENDOTHELIAL CELLS; INOSITOL TRISPHOSPHATE; EXTRACELLULAR-MATRIX; SIGNAL TRANSDUCTION; PERICELLULAR MATRIX; MITOGENIC ACTIVITY; RECEPTOR FUNCTION; LOCALIZATION; INITIATION; COMPONENTS AB Thrombin, a serine protease generated at wound sites, takes part in multiple biological functions, including wound healing. The present report elucidates the effect of thrombin on fibronectin (FN) synthesis and secretion in fibroblasts and epithelial cells. Subconfluent cultures of mouse L(B) fibroblasts and human A549 epithelial cells were exposed to various concentrations of bovine plasma thrombin at 37-degrees-C for 16 hr. After exposure, cells were processed for determination of cell-associated and secreted FN by metabolic labeling, immuno-precipitation, immunofluorescence, and peroxidase immunocytochemistry. The correlation of FN production with cell growth was studied by a combined procedure of peroxidase immunocytochemistry and light microscopic autoradiography. The amounts of cell-associated and secreted FN were significantly increased with dose increments of thrombin. The increases were most evident in secreted FN. The increase of cell-associated FN was also evidenced by results from immunofluorescence and immunocytochemical studies. Ultrastructurally, the intracellular FN was localized in rough endoplasmic reticulum, Golgi complexes, and secretory granules, whereas non-released extracellular FN was localized in the plasma membrane of cell-to-cell contacts and in the extracellular fibrils. More intense cytoplasmic FN staining was observed in cells that were not labeled with [H-3]-thymidine, indicating that FN production may vary with different phases of cell growth. The results imply that thrombin may play an important role in the early phases of wound healing. C1 UNIFORMED SERV UNIV HLTH SCI,BETHESDA,MD 20814. RP KANG, YH (reprint author), USN,MED RES INST,CCRD,DIV PATHOPHYSIOL,BETHESDA,MD 20814, USA. NR 47 TC 24 Z9 24 U1 0 U2 0 PU HISTOCHEMICAL SOC INC PI NEW YORK PA MT SINAI MEDICAL CENTER 19 EAST 98TH ST SUTIE 9G, NEW YORK, NY 10029 SN 0022-1554 J9 J HISTOCHEM CYTOCHEM JI J. Histochem. Cytochem. PD APR PY 1991 VL 39 IS 4 BP 413 EP 423 PG 11 WC Cell Biology SC Cell Biology GA FC518 UT WOS:A1991FC51800004 PM 2005371 ER PT J AU MCLANDRICH, MN ORAZI, RJ MARLIN, HR AF MCLANDRICH, MN ORAZI, RJ MARLIN, HR TI POLARIZATION INDEPENDENT NARROW CHANNEL WAVELENGTH DIVISION MULTIPLEXING FIBER COUPLERS FOR 1.55 MU-M SO JOURNAL OF LIGHTWAVE TECHNOLOGY LA English DT Article ID DEMULTIPLEXER AB A polarization independent narrow channel (PINC) wavelength division multiplexing (WDM) coupler for 1.55-mu-m has been designed based on the birefringent properties of fused single-mode couplers. The couplers are made so that they are highly overcoupled so that the coupling coefficient-length products for the two orthogonal coupler polarizations are pi out of phase for input wavelengths near 1.55-mu-m. The resulting wavelength separation between adjacent maxima and minima of the coupled power is on the order of 22 nm. The devices have been packaged in an environmentally insensitive casing, and show minimal variations in coupling characteristics with changing pressure and temperature. RP MCLANDRICH, MN (reprint author), USN, DIV ELECTR MAT SCI, SAN DIEGO, CA 92152 USA. NR 14 TC 19 Z9 20 U1 0 U2 0 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI PISCATAWAY PA 445 HOES LANE, PISCATAWAY, NJ 08855-4141 USA SN 0733-8724 EI 1558-2213 J9 J LIGHTWAVE TECHNOL JI J. Lightwave Technol. PD APR PY 1991 VL 9 IS 4 BP 442 EP 447 DI 10.1109/50.76657 PG 6 WC Engineering, Electrical & Electronic; Optics; Telecommunications SC Engineering; Optics; Telecommunications GA FD874 UT WOS:A1991FD87400006 ER PT J AU BUESS, ML GARROWAY, AN MILLER, JB AF BUESS, ML GARROWAY, AN MILLER, JB TI NQR DETECTION USING A MEANDERLINE SURFACE COIL SO JOURNAL OF MAGNETIC RESONANCE LA English DT Article ID NUCLEAR-QUADRUPOLE RESONANCE; RELAXATION MEASUREMENTS; NMR RP BUESS, ML (reprint author), USN,RES LAB,DIV CHEM,NAVAL TECHNOL OFF,CODE 6122,WASHINGTON,DC 20375, USA. NR 15 TC 36 Z9 36 U1 0 U2 4 PU ACADEMIC PRESS INC JNL-COMP SUBSCRIPTIONS PI SAN DIEGO PA 525 B ST, STE 1900, SAN DIEGO, CA 92101-4495 SN 0022-2364 J9 J MAGN RESON PD APR PY 1991 VL 92 IS 2 BP 348 EP 362 DI 10.1016/0022-2364(91)90276-Y PG 15 WC Biochemical Research Methods; Physics, Atomic, Molecular & Chemical; Spectroscopy SC Biochemistry & Molecular Biology; Physics; Spectroscopy GA FE605 UT WOS:A1991FE60500010 ER PT J AU FOX, AG FULLER, SC WHITMAN, CE AF FOX, AG FULLER, SC WHITMAN, CE TI A POWDER X-RAY-DIFFRACTION STUDY OF A SOLUTION TREATED AND ICE BRINE QUENCHED AL-14.25 AT PERCENT LI ALLOY SO JOURNAL OF MATERIALS RESEARCH LA English DT Article ID AL-LI; DECOMPOSITION; DELTA'; ZONES AB An x-ray diffractogram was generated from a powder sample of solution treated and ice brine quenched Al-14.25 at. % Li alloy. The Bragg reflections obtained were characteristic of a very-nearly fully ordered Al-rich L1(2) phase based on delta' Al3Li together with two very weak reflections associated with delta-AlLi. All the lines were significantly broadened due to particle size effects. The average particle size associated with the 100 L1(2) superlattice line was found to be 4.2 (3) nm and with the fundamental lines, 26.8 nm. A simple structure factor calculation indicated the volume fraction of ordered phase to be around 0.77, assuming that the lack of maximum order was due to the presence of disordered fcc AlLi solid solution. These results suggest that the microstructure of this as-quenched alloy comprises ordered regions of about 4 nm in size in a sea of disordered matrix with a very small amount of delta-AlLi present. This conclusion is in excellent agreement with recent small angle x-ray and transmission electron microscope studies on similar alloys and suggests that AlLi alloys which are ostensibly disordered at high temperatures go through a disorder-order transformation and then decompose into regions of order and disorder which are associated with a composition spinodal. C1 UNIV BELGRADE, DEPT MET, YU-11000 BELGRADE, YUGOSLAVIA. RP USN, POSTGRAD SCH, DEPT MECH ENGN, MAT SCI SECT, MONTEREY, CA 93943 USA. NR 22 TC 7 Z9 7 U1 0 U2 1 PU CAMBRIDGE UNIV PRESS PI NEW YORK PA 32 AVENUE OF THE AMERICAS, NEW YORK, NY 10013-2473 USA SN 0884-2914 EI 2044-5326 J9 J MATER RES JI J. Mater. Res. PD APR PY 1991 VL 6 IS 4 BP 712 EP 718 DI 10.1557/JMR.1991.0712 PG 7 WC Materials Science, Multidisciplinary SC Materials Science GA FF002 UT WOS:A1991FF00200007 ER PT J AU CHOW, GM PATTNAIK, A SCHLESINGER, TE CAMMARATA, RC TWIGG, ME EDELSTEIN, AS AF CHOW, GM PATTNAIK, A SCHLESINGER, TE CAMMARATA, RC TWIGG, ME EDELSTEIN, AS TI SPUTTERING SYNTHESIS AND PROPERTIES OF MOLYBDENUM NANOCRYSTALS AND AL MO LAYERED NANOCOMPOSITES SO JOURNAL OF MATERIALS RESEARCH LA English DT Article ID METAL PARTICLES; THIN-FILMS AB Molybdenum nanocrystals (4 nm < particle size < 12 nm) were synthesized in the vapor by sputtering in a thermal gradient at argon pressures between 0.2 and 0.6 Torr. The gradient was achieved by cooling the substrate table with liquid nitrogen in order to enhance the deposition rate of the nanocrystals. The size of these nanocrystals depended on the sputtering argon gas pressure. Using appropriate deposition parameters, these nanocrystals were incorporated, either as a dispersed phase in a major phase produced by normal sputtering or as a layer in a layered structure to produce nanocomposite films. Results of Auger electron spectroscopy (AES) study of the Al/Mo layered nanocomposite films are presented. The Knoop microhardness of these films was increased by as much as a factor of four compared with the hardness of homogeneous Al films. A correlation of the microhardness to the microstructures as revealed by transmission electron microscopy (TEM) is discussed. C1 USN,RES LAB,WASHINGTON,DC 20375. JOHNS HOPKINS UNIV,DEPT MAT SCI & ENGN,BALTIMORE,MD 21218. NATL ACAD SCI,NATL RES COUNCIL,WASHINGTON,DC. RI Cammarata, Robert /A-3307-2010 NR 15 TC 13 Z9 13 U1 0 U2 1 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 APR PY 1991 VL 6 IS 4 BP 737 EP 743 DI 10.1557/JMR.1991.0737 PG 7 WC Materials Science, Multidisciplinary SC Materials Science GA FF002 UT WOS:A1991FF00200011 ER PT J AU GREENHUT, J AF GREENHUT, J TI BEYOND THE KHYBER PASS - THE ROAD TO BRITISH DISASTER IN THE 1ST AFGHAN-WAR - WALLER,JH SO JOURNAL OF MILITARY HISTORY LA English DT Book Review RP GREENHUT, J (reprint author), USN,SECUR GRP,WASHINGTON,DC 20350, USA. NR 1 TC 0 Z9 0 U1 0 U2 0 PU VIRGINIA MILITARY INST PI LEXINGTON PA LEXINGTON, VA 24450 SN 0899-3718 J9 J MILITARY HIST JI J. Mil. Hist. PD APR PY 1991 VL 55 IS 2 BP 251 EP 252 DI 10.2307/1985910 PG 2 WC History SC History GA FH415 UT WOS:A1991FH41500020 ER PT J AU ANDEREGG, CR MARTIN, SJ GRAY, JL MELLONIG, JT GHER, ME AF ANDEREGG, CR MARTIN, SJ GRAY, JL MELLONIG, JT GHER, ME TI CLINICAL-EVALUATION OF THE USE OF DECALCIFIED FREEZE-DRIED BONE ALLOGRAFT WITH GUIDED TISSUE REGENERATION IN THE TREATMENT OF MOLAR FURCATION INVASIONS SO JOURNAL OF PERIODONTOLOGY LA English DT Article DE GUIDED TISSUE REGENERATION; WOUND HEALING; BONE REGENERATION; FURCATION INVOLVEMENT THERAPY; CEMENTUM REGENERATION ID ATTACHMENT FORMATION; BEAGLE DOGS; DEFECTS AB THE PURPOSE OF THIS STUDY IS TO EVALUATE the potential of decalcified freeze-dried bone allograft (DFDBA) combined with a barrier material in the treatment of human molar furcation defects (experimental) as compared to the barrier technique alone (control). Fifteen pairs of Class II or III furcation invasion defects comprised the study group. Measurements with calibrated peridontal probes were made to determine soft tissue recession, probing depth, and attachment levels. Defects from each pair were randomly selected to be treated with an expanded polytetrafluoroethylene membrane (e-PTFE) and DFDBA or the membrane alone. Additional measurements were made during surgery to determine crestal resorption, and vertical and horizontal open probing attachment. The membrane was removed 4 to 6 weeks post-insertion. Six months post-treatment, each site was surgically reentered and measurements repeated. Following either treatment, recession was minimal with statistically significant improvement in probing depth reduction and clinical attachment level gain favoring the combined technique. Hard tissue changes were comparable for alveolar crestal resorption, however, there was a distinct difference, statistically, for both horizontal and vertical bone repair favoring the use of the demineralized bone graft in combination with the e-PTFE membrane. C1 USN,DENT CLIN,LONG BEACH,CA 90801. RP ANDEREGG, CR (reprint author), NATL NAVAL DENT CTR,NAVAL DENT SCH,DEPT PERIODONT,BETHESDA,MD 20814, USA. NR 18 TC 145 Z9 149 U1 0 U2 3 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 APR PY 1991 VL 62 IS 4 BP 264 EP 268 DI 10.1902/jop.1991.62.4.264 PG 5 WC Dentistry, Oral Surgery & Medicine SC Dentistry, Oral Surgery & Medicine GA FF981 UT WOS:A1991FF98100005 PM 2037957 ER PT J AU MIED, RP MCWILLIAMS, JC LINDEMANN, GJ AF MIED, RP MCWILLIAMS, JC LINDEMANN, GJ TI THE GENERATION AND EVOLUTION OF MUSHROOM-LIKE VORTICES SO JOURNAL OF PHYSICAL OCEANOGRAPHY LA English DT Article ID GULF-STREAM RINGS; VANCOUVER ISLAND; COASTAL CURRENT; EDDIES; CALIFORNIA; MEANDERS AB Numerical simulations have been performed to understand the generation and evolution of mushroom-like patterns observed in remote sensing images of the ocean surface. A two-layer, shallow-water model is employed using a periodic channel on an f-plane. The model is initialized with a unidirectional upper-ocean momentum patch; the lower layer is at rest, and there is no initial interface displacement. A tracer is used to simulate the presence of passive ocean surface fields advected by the flow. The model thus simulates a nonlinear geostrophic adjustment process at finite Rossby number with a strong radiated wave field and rapid tracer advection. Several types of tracer configuration result, depending upon the size of the Rossby number and the ratio of the patch size to the internal deformation radius. The values of these parameters determine the degree of symmetry of the mushroom pattern, or whether a mushroom tracer distribution even results from the initial flow field. The numerical model is always operated with the ratio of upper layer to lower layer heights small, and analytical calculations using the reduced-gravity, shallow-water equations are used to interpret the numerical results. C1 NATL CTR ATMOSPHER RES,BOULDER,CO 80307. RP MIED, RP (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 17 TC 25 Z9 26 U1 0 U2 2 PU AMER METEOROLOGICAL SOC PI BOSTON PA 45 BEACON ST, BOSTON, MA 02108-3693 SN 0022-3670 J9 J PHYS OCEANOGR JI J. Phys. Oceanogr. PD APR PY 1991 VL 21 IS 4 BP 489 EP 510 DI 10.1175/1520-0485(1991)021<0489:TGAEOM>2.0.CO;2 PG 22 WC Oceanography SC Oceanography GA FH289 UT WOS:A1991FH28900002 ER PT J AU HANEY, RL AF HANEY, RL TI ON THE PRESSURE-GRADIENT FORCE OVER STEEP TOPOGRAPHY IN SIGMA COORDINATE OCEAN MODELS SO JOURNAL OF PHYSICAL OCEANOGRAPHY LA English DT Note AB The error in computing the pressure gradient force near steep topography using terrain following (sigma) coordinates is investigated in an ocean model using the family of vertical differencing schemes proposed by Arakawa and Suarez. The truncation error is estimated by substituting known buoyancy profiles into the finite difference hydrostatic and pressure gradient terms. The error due to "hydrostatic inconsistency," which is not simply a space truncation error, is also documented. The results show that the pressure gradient error is spread throughout the water column, and it is sensitive to the vertical resolution and to the placement of the grid points relative to the vertical structure of the buoyancy field being modeled. Removing a reference state, as suggested for the atmosphere by Gary, reduces the truncation error associated with the two lowest vertical modes by a factor of 2 to 3. As an example, the error in computing the pressure gradient using a standard 10-level primitive equation model applied to buoyancy profiles and topographic slopes typical of the California Current region corresponds to a false geostrophic current of the order of 10-12 cm s-1. The analogous error in a hydrostatically consistent 30-level model with the reference state removed is about an order of magnitude smaller. RP HANEY, RL (reprint author), USN,POSTGRAD SCH,DEPT METEOROL,MONTEREY,CA 93943, USA. NR 17 TC 316 Z9 331 U1 0 U2 3 PU AMER METEOROLOGICAL SOC PI BOSTON PA 45 BEACON ST, BOSTON, MA 02108-3693 SN 0022-3670 J9 J PHYS OCEANOGR JI J. Phys. Oceanogr. PD APR PY 1991 VL 21 IS 4 BP 610 EP 619 DI 10.1175/1520-0485(1991)021<0610:OTPGFO>2.0.CO;2 PG 10 WC Oceanography SC Oceanography GA FH289 UT WOS:A1991FH28900009 ER PT J AU ADOLPH, HG NOCK, LA GOLDWASSER, JM FARNCOMB, RE AF ADOLPH, HG NOCK, LA GOLDWASSER, JM FARNCOMB, RE TI NITROPOLYFORMALS AND FLUOROPOLYFORMALS .2. NOVEL POLYFORMALS FROM ALPHA, OMEGA-FLUORODIOLS AND ALPHA, OMEGA-NITRODIOLS SO JOURNAL OF POLYMER SCIENCE PART A-POLYMER CHEMISTRY LA English DT Article AB The scope of polyformal formation from nitro- and fluorodiols has been explored further with a series of alpha, omega-diols. Polymers with MBAR(n)S of 2000-4000 were generally obtained but MBAR(n)S approaching 10,000 are possible in some cases. Effects of monomer structure and reaction parameters on polymer molecular weight are described. The polymers were characterized by GPC, H-1-NMR, and DSC analysis. RP ADOLPH, HG (reprint author), USN,CTR SURFACE WARFARE,DIV ENERGET MAT,SILVER SPRING,MD 20903, USA. NR 6 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 0887-624X J9 J POLYM SCI POL CHEM JI J. Polym. Sci. Pol. Chem. PD APR PY 1991 VL 29 IS 5 BP 719 EP 727 DI 10.1002/pola.1991.080290514 PG 9 WC Polymer Science SC Polymer Science GA FC260 UT WOS:A1991FC26000014 ER PT J AU MEHLMAN, G BURKHALTER, PG NEWMAN, DA RIPIN, BH AF MEHLMAN, G BURKHALTER, PG NEWMAN, DA RIPIN, BH TI SOFT-X-RAY CONTINUUM FROM LASER-IRRADIATED HIGH-Z TARGETS SO JOURNAL OF QUANTITATIVE SPECTROSCOPY & RADIATIVE TRANSFER LA English DT Article ID WAVELENGTH CALIBRATION; TRANSITION ARRAYS; PLASMA; SPECTROSCOPY; ELEMENTS; SPECTRA; CRYSTAL; RANGE; GOLD AB X-ray data were acquired from intermediate- and high-Z element targets with the Pharos III laser system. Targets, mounted at the tip of thin glass stalks, were microscopic fragments or foils of single or multiple high-Z element composition. The laser irradiance was 4 x 10(14) W/cm2 with about 300 J of a focused, 1.05-mu-m wavelength laser beam. A convex KAP crystal spectrograph was used to collect high-resolution spectra in the 4-20 angstrom soft X-ray region. The recorded spectral film densities were microdensitometered and converted by computer-processing to absolute continuum intensities. The spectral features were identified with the aid of ab initio atomic structure calculations. The continuum background was evaluated as a source of pseudo-continua for absorption studies of soft X-rays. C1 USN,RES LAB,WASHINGTON,DC 20375. RP MEHLMAN, G (reprint author), SACHS FREEMAN ASSOCIATES INC,LANDOVER,MD 20785, USA. NR 20 TC 4 Z9 4 U1 0 U2 0 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0022-4073 J9 J QUANT SPECTROSC RA JI J. Quant. Spectrosc. Radiat. Transf. PD APR PY 1991 VL 45 IS 4 BP 225 EP 234 DI 10.1016/0022-4073(91)90057-W PG 10 WC Optics; Spectroscopy SC Optics; Spectroscopy GA FA957 UT WOS:A1991FA95700005 ER PT J AU CUNNINGHAM, DS JENSEN, JT AF CUNNINGHAM, DS JENSEN, JT TI HEREDITARY ANGIONEUROTIC-EDEMA IN THE PUERPERIUM - A CASE-REPORT SO JOURNAL OF REPRODUCTIVE MEDICINE LA English DT Article ID ANGIOEDEMA AB Hereditary angioneurotic edema is a potentially fatal condition. Below is described the first reported case of the initial presentation of the condition precipitated by vaginal delivery. C1 USN HOSP,DEPT OBSTET & GYNECOL,SUBIC BAY,PHILIPPINES. RP CUNNINGHAM, DS (reprint author), USN HOSP,DEPT OBSTET & GYNECOL,PORTSMOUTH,VA 23708, USA. OI Jensen, Jeffrey/0000-0002-4733-1224 NR 9 TC 7 Z9 8 U1 0 U2 0 PU SCI PRINTERS & PUBL INC PI ST LOUIS PA P.O. DRAWER 12425 8342 OLIVE BLVD, ST LOUIS, MO 63132 SN 0024-7758 J9 J REPROD MED JI J. Reprod. Med. PD APR PY 1991 VL 36 IS 4 BP 312 EP 313 PG 2 WC Obstetrics & Gynecology SC Obstetrics & Gynecology GA FH069 UT WOS:A1991FH06900015 PM 2072364 ER PT J AU KRAMER, B AF KRAMER, B TI INTRODUCING THE GRASPIN SPECIFICATION LANGUAGE SEGRAS SO JOURNAL OF SYSTEMS AND SOFTWARE LA English DT Article ID MODULES AB SEGRAS is a novel language for writing formal specifications of concurrent and distributed systems. It integrates algebraic specifications of abstract data types, high-level Petri net specifications of concurrent behavior, and a sort of parametric polymorphism in a common syntactic and semantic framework. The language treats data abstractions with distributed states and state-dependent operations that can dynamically create new data objects and concurrently modify their properties according to a specified dynamic behavior. Interactive construction and formal analysis of SEGRAS specifications is supported by a collection of tools integrated in the GRASPIN environment. This article illustrates some salient features of the language through examples and discusses methodological issues concerned with constructing, analyzing, and executing SEGRAS specifications with the aid of the GRASPIN environment. C1 USN, POSTGRAD SCH, DEPT COMP SCI, MONTEREY, CA 93940 USA. OI Kramer, Bernd/0000-0001-8433-2667 NR 44 TC 10 Z9 10 U1 0 U2 1 PU ELSEVIER SCIENCE INC PI NEW YORK PA 360 PARK AVE SOUTH, NEW YORK, NY 10010-1710 USA SN 0164-1212 EI 1873-1228 J9 J SYST SOFTWARE JI J. Syst. Softw. PD APR PY 1991 VL 15 IS 1 BP 17 EP 31 DI 10.1016/0164-1212(91)90074-G PG 15 WC Computer Science, Software Engineering; Computer Science, Theory & Methods SC Computer Science GA FP237 UT WOS:A1991FP23700004 ER PT J AU KRAMER, B LUQI AF KRAMER, B LUQI TI TOWARD FORMAL MODELS OF SOFTWARE ENGINEERING PROCESSES SO JOURNAL OF SYSTEMS AND SOFTWARE LA English DT Article AB In this paper, a Petri net-based formal specification method for distributed systems is applied to the domain of software process modeling. We introduce domain-specific concepts stressing the distributed and dynamic nature of software processes. Development states are viewed as distributed entities. Development activities are characterized by their effects on software objects, pertinent information exchange with human or technical participants involved, and local changes to development states. These dynamic aspects of software processes are represented as labeled Petri nets. Structuring mechanisms are sketched which support hierarchical decomposition and systematic combinations of separate views of a software engineering process. C1 USN,POSTGRAD SCH,DEPT COMP SCI,MONTEREY,CA 93943. OI Kramer, Bernd/0000-0001-8433-2667 NR 16 TC 4 Z9 4 U1 0 U2 0 PU ELSEVIER SCIENCE INC PI NEW YORK PA 655 AVENUE OF THE AMERICAS, NEW YORK, NY 10010 SN 0164-1212 J9 J SYST SOFTWARE JI J. Syst. Softw. PD APR PY 1991 VL 15 IS 1 BP 63 EP 74 DI 10.1016/0164-1212(91)90077-J PG 12 WC Computer Science, Software Engineering; Computer Science, Theory & Methods SC Computer Science GA FP237 UT WOS:A1991FP23700007 ER PT J AU SCANDRETT, C VASUDEVAN, N AF SCANDRETT, C VASUDEVAN, N TI THE PROPAGATION OF TIME HARMONIC RAYLEIGH-LAMB WAVES IN A BIMATERIAL PLATE SO JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA LA English DT Article AB The time harmonic elastodynamic response of two semi-infinite elastic plates of dissimilar material properties perfectly bonded along their lateral faces is studied. The wave field in either half-plate can be written as a superposition of the so-called Rayleigh-Lamb eigenmodes of an infinite plate. The interaction of a time harmonic incident wave with the interface results in reflected and transmitted fields that contain contributions from all of the real, imaginary, and complex eigenmodes of an infinite plate. Attention is focused on the distribution of energy among the various reflected and transmitted eigenmodes over a range of frequencies. The fundamental symmetric and the fundamental antisymmetric Lamb modes are each used as input excitations. Such excitations can be approximately realized in experiments. It is assumed that the solution of such a canonical problem will facilitate the solution of problems with complicated time-dependent sources. RP SCANDRETT, C (reprint author), USN,POSTGRAD SCH,DEPT MATH,MONTEREY,CA 93942, USA. NR 14 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 0001-4966 J9 J ACOUST SOC AM JI J. Acoust. Soc. Am. PD APR PY 1991 VL 89 IS 4 BP 1606 EP 1614 DI 10.1121/1.400995 PN 1 PG 9 WC Acoustics; Audiology & Speech-Language Pathology SC Acoustics; Audiology & Speech-Language Pathology GA FE640 UT WOS:A1991FE64000010 ER PT J AU WILLIAMS, EG AF WILLIAMS, EG TI STRUCTURAL INTENSITY IN THIN CYLINDRICAL-SHELLS SO JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA LA English DT Article ID PLATES AB A rigorous derivation of the structural intensity vector for a thin cylindrical shell is provided based on Flugge's equations of motion and expressions for the total energy density in the shell. The shell is assumed driven by normal forces, loaded externally by a fluid, and to have no internal loss. It is confirmed that the structural intensity vector is composed of five terms, and simple physical interpretations of these terms are provided. The relationship between the structural intensity and the normal acoustic intensity is derived. The five structural intensity terms are investigated in some detail using results from a numerical experiment. The numerical model was a simply supported, point-driven cylindrical shell with external fluid loading, assumed to exist in an infinite rigid baffle. A sum over in vacuo modes was used to solve the equations of motion. The results show, in the frequency range below the ring resonance of a steel shell with h/a = 0.01, that the divergence of the extensional power flow term dominates over the other four terms in the transfer of power to the fluid and, equivalently, into the far field. RP WILLIAMS, EG (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 15 TC 20 Z9 25 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 APR PY 1991 VL 89 IS 4 BP 1615 EP 1622 DI 10.1121/1.400996 PN 1 PG 8 WC Acoustics; Audiology & Speech-Language Pathology SC Acoustics; Audiology & Speech-Language Pathology GA FE640 UT WOS:A1991FE64000011 ER PT J AU GAUNAURD, GC WERBY, MF AF GAUNAURD, GC WERBY, MF TI LAMB AND CREEPING WAVES AROUND SUBMERGED SPHERICAL-SHELLS RESONANTLY EXCITED BY SOUND SCATTERING .2. FURTHER APPLICATIONS SO JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA LA English DT Article AB The scattering of plane sound waves from an air-filled steel spherical shell submerged in water in the frequency band 0 less-than-or-equal-to k1 a less-than-or-equal-to 500 is studied. This analysis is based on a methodology [Ayres et al., Int. J. Solids Struct. 23, 937-946 (1987) and G. Gaunaurd and M. F. Werby, J. Acoust. Soc. Am. 82, 2021-2033 (1987)] proposed that uses the exact three-dimensional equations of dynamic elasticity to describe the shell motions and to predict its sonar scattering cross section. This approach is valid at all frequencies, for shells of any thickness, of any (constant) curvature, and it accounts for their fluid-loaded condition. The methodology is used to predict the cross sections, which are later interpreted on the basis of the various resonance features that manifest themselves in the frequency response. The spectral locations of these resonances depend on the various types of elastic waves propagating along the shell, or in the surrounding fluid. The exact plots are generated for the phase (c(p)) velocities of these (Lamb) waves always accounting for the curvature and fluid-loading effects present on the shell, without appeals to plate waves or theories. Some of the dispersion plots were generated using the Donnell shell-theory approximation, which seems to yield accurate results up to the coincidence frequency. Aside from the broad resonance lobe present at the coincidence frequency, there is another high-frequency resonance lobe, due to a thickness-resonance effect, which was also predicted and displayed. A partial-wave analysis of the resonance response curve for a thin shell, around its coincidence frequency, serves to identify the origins of the various types of observed resonance features and to relate them to the elastic and acoustic waves that propagate along the shell or the outer fluid. Many computer-generated graphs are displayed to illustrate the above points. C1 USN,OCEAN & ATMOSPHER RES LAB,CODE 221,DIV NUMER MODELLING,STENNIS SPACE CTR,MS 39524. RP GAUNAURD, GC (reprint author), USN,CTR SURFACE WARFARE,WHITE OAK LAB,CODE R42,SILVER SPRING,MD 20903, USA. RI CHEN, Jiangang/A-1549-2011 NR 32 TC 12 Z9 12 U1 0 U2 2 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0001-4966 J9 J ACOUST SOC AM JI J. Acoust. Soc. Am. PD APR PY 1991 VL 89 IS 4 BP 1656 EP 1667 DI 10.1121/1.400999 PN 1 PG 12 WC Acoustics; Audiology & Speech-Language Pathology SC Acoustics; Audiology & Speech-Language Pathology GA FE640 UT WOS:A1991FE64000015 ER PT J AU OGRADY, TC SAHN, EE AF OGRADY, TC SAHN, EE TI INVESTIGATION OF ASYMPTOMATIC TINEA-PEDIS IN CHILDREN SO JOURNAL OF THE AMERICAN ACADEMY OF DERMATOLOGY LA English DT Note ID TRICHOPHYTON-TONSURANS; CARRIER STATE C1 MED UNIV S CAROLINA,DEPT DERMATOL,171 ASHLEY AVE,CHARLESTON,SC 29425. MED UNIV S CAROLINA,DEPT PEDIAT,CHARLESTON,SC 29425. BEAUFORT NAVAL HOSP,BEAUFORT,SC. SAN DIEGO NAVAL HOSP,SAN DIEGO,CA. NR 8 TC 7 Z9 7 U1 0 U2 0 PU MOSBY-YEAR BOOK INC PI ST LOUIS PA 11830 WESTLINE INDUSTRIAL DR, ST LOUIS, MO 63146-3318 SN 0190-9622 J9 J AM ACAD DERMATOL JI J. Am. Acad. Dermatol. PD APR PY 1991 VL 24 IS 4 BP 660 EP 661 DI 10.1016/S0190-9622(08)80170-3 PG 2 WC Dermatology SC Dermatology GA FD903 UT WOS:A1991FD90300036 PM 2033154 ER PT J AU JEWELL, JM JAGANATHAN, J AGGARWAL, ID AF JEWELL, JM JAGANATHAN, J AGGARWAL, ID TI HETEROGENEOUS PLATINUM NUCLEATION AND CRYSTALLIZATION OF A HEAVY-METAL FLUORIDE GLASS SO JOURNAL OF THE AMERICAN CERAMIC SOCIETY LA English DT Article DE HETEROGENEOUS; NUCLEATION; CRYSTALLIZATION; FLUORIDES; GLASS ID FLUOROZIRCONATE AB The effect of controlled heterogeneous nucleation by platinum on the crystallization of a ZrF4-BaF2-LaF3-AlF3-NaF (ZBLAN) glass was studied. Various levels of platinum were incorporated into this glass by a combination of PtCl2-doping and melting-atmosphere variation. The effect of doping levels and melting conditions on the incorporation of platinum and the subsequent nucleation of crystals was studied by optical microscopy, scanning electron microscopy, differential scanning calorimetry (DSC), and X-ray diffraction. Increased platinum in the glass resulted in an increased number of nucleation sites for the growth of beta-ZrF4-BaF2 crystals. Analysis of isothermal and ramp-rate DSC measurements indicated that the crystallization of this glass changed from surface controlled to bulk controlled with an increased number of nuclei. This was confirmed by optical microscopy. In addition, Avrami analysis of the isothermal crystallization data gave an accurate approximation of the number of nuclei in the glass. C1 GEOCENTERS INC,FT WASHINGTON,MD. RP JEWELL, JM (reprint author), USN,RES LAB,OPT MAT RES GRP,WASHINGTON,DC 20375, USA. NR 42 TC 9 Z9 9 U1 0 U2 3 PU AMER CERAMIC SOC PI WESTERVILLE PA 735 CERAMIC PLACE, PO BOX 6136, WESTERVILLE, OH 43081-6136 SN 0002-7820 J9 J AM CERAM SOC JI J. Am. Ceram. Soc. PD APR PY 1991 VL 74 IS 4 BP 788 EP 796 DI 10.1111/j.1151-2916.1991.tb06926.x PG 9 WC Materials Science, Ceramics SC Materials Science GA FF810 UT WOS:A1991FF81000016 ER PT J AU GLEMBOCKI, OJ PALIK, ED DEGUEL, GR KENDALL, DL AF GLEMBOCKI, OJ PALIK, ED DEGUEL, GR KENDALL, DL TI HYDRATION MODEL FOR THE MOLARITY DEPENDENCE OF THE ETCH RATE OF SI IN AQUEOUS ALKALI HYDROXIDES SO JOURNAL OF THE ELECTROCHEMICAL SOCIETY LA English DT Article ID SILICON; WATER AB We present a model to explain the peak observed in the Si etch rate vs. molarity for several alkali-hydroxide solutions. This model requires both free water molecules (H2O)f and hydroxyl ions (OH-) to accomplish etching. As the molarity increases, the OH- concentration increases, while hydration effects steadily reduce the (H2O)f concentration. These two competing effects produce a peak in the etch rate, the location of which is sensitive to the mean hydration number of the particular solution. Results for KOH, NaOH, and LiOH are generally accounted for by the model using mean hydration numbers obtained from independent chemical activity data in the literature. Data for aqueous KOH solutions only (unstirred and stirred) show that stirring shifts the peak etch rate to slightly lower molarity and raises the peak etch rate somewhat, but the behavior is by and large unchanged. Also, at low molarity from 0.1 to 2M the stirred etch rate is measured to be roughly constant, then rises to a peak near 5M. We have attempted to use the present model to account for these more detailed effects and to obtain additional information about the possible etching mechanism applicable at low molarity, where free water alone appears to be the dominant (or rate-limiting) etching species. The very large dependence of the etch rate on crystal orientation at high molarity may be due to geometrical effects in the way the hydration complexes interact with the different crystal surfaces. C1 UNIV NEW MEXICO,CTR HIGH TECHNOL MAT,ALBUQUERQUE,NM 87131. RP GLEMBOCKI, OJ (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 36 TC 59 Z9 61 U1 6 U2 16 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 APR PY 1991 VL 138 IS 4 BP 1055 EP 1063 DI 10.1149/1.2085715 PG 9 WC Electrochemistry; Materials Science, Coatings & Films SC Electrochemistry; Materials Science GA FF270 UT WOS:A1991FF27000030 ER PT J AU JANI, MG REEVES, RJ POWELL, RC QUARLES, GJ ESTEROWITZ, L AF JANI, MG REEVES, RJ POWELL, RC QUARLES, GJ ESTEROWITZ, L TI ALEXANDRITE-LASER EXCITATION OF A TM-HO-Y3AL5O12 LASER SO JOURNAL OF THE OPTICAL SOCIETY OF AMERICA B-OPTICAL PHYSICS LA English DT Article ID ROOM-TEMPERATURE LASER; HO-YAG; TM; OPERATION; TM-3+ AB Laser-pumped laser characteristics of a Tm:Ho:Y3Al5O12(YAG) crystal were measured as a function of the wavelength and energy of the alexandrite-laser pump source. Laser thresholds and slope efficiencies were recorded for 765-, 780-, and 785-nm pump wavelengths. Simultaneous laser emission was observed at 2.060, 2.065, 2.097, and 2.101-mu-m, and the relative intensities of these peaks were measured as a function of absorbed pump energy. Changes in temporal and spectral profiles of the laser emission were observed with variations in absorbed pump energy. When measurements were made with a monolithic crystal cavity instead of an open cavity, laser emission from Ho3+ was observed at 2.097-mu-m, and an additional laser peak was observed that may be due to transitions of the Tm3+ ions. C1 USN,RES LAB,WASHINGTON,DC 20375. RP JANI, MG (reprint author), OKLAHOMA STATE UNIV,CTR LASER RES,STILLWATER,OK 74078, USA. NR 17 TC 22 Z9 22 U1 1 U2 4 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 APR PY 1991 VL 8 IS 4 BP 741 EP 746 DI 10.1364/JOSAB.8.000741 PG 6 WC Optics SC Optics GA FF433 UT WOS:A1991FF43300004 ER PT J AU HULL, AJ RADCLIFFE, CJ AF HULL, AJ RADCLIFFE, CJ TI AN EIGENVALUE BASED ACOUSTIC-IMPEDANCE MEASUREMENT TECHNIQUE SO JOURNAL OF VIBRATION AND ACOUSTICS-TRANSACTIONS OF THE ASME LA English DT Article AB A method is developed for measuring acoustic impedance. The method employs a one-dimensional tube or duct with excitation at one end and an unknown acoustic impedance at the termination end. Microphones placed in the tube are then employed to measure the frequency response of the system from which acoustic impedance of the end is calculated. This method uses fixed instrumentation and takes advantage of modern Fast Fourier Transform analyzers. Conventional impedance tube methods have errors resulting from movement of microphones to locate the maxima and minima of the wave pattern in the impedance tube or require phase matched microphones with specific microphone spacing. This technique avoids these problems by calculating the acoustic impedance from measured duct eigenvalues. Laboratory tests of the method are presented to demonstrate its accuracy. RP HULL, AJ (reprint author), USN,CTR UNDERWATER SYST,NEW LONDON,CT 06320, USA. NR 0 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 1048-9002 J9 J VIB ACOUST JI J. Vib. Acoust.-Trans. ASME PD APR PY 1991 VL 113 IS 2 BP 250 EP 254 DI 10.1115/1.2930178 PG 5 WC Acoustics; Engineering, Mechanical; Mechanics SC Acoustics; Engineering; Mechanics GA HP728 UT WOS:A1991HP72800017 ER PT J AU SMOOT, NC AF SMOOT, NC TI THE GROWTH-RATE OF SUBMARINE VOLCANOS ON THE SOUTH HONSHU AND EAST MARIANA RIDGES - REPLY SO JOURNAL OF VOLCANOLOGY AND GEOTHERMAL RESEARCH LA English DT Note C1 USN,OCEANOG OFF,WASHINGTON,DC. RP SMOOT, NC (reprint author), DIVERSIFIED SERV,201 N MAIN ST,PICAYUNE,MS 39466, USA. NR 4 TC 1 Z9 2 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0377-0273 J9 J VOLCANOL GEOTH RES JI J. Volcanol. Geotherm. Res. PD APR PY 1991 VL 45 IS 3-4 BP 341 EP 345 DI 10.1016/0377-0273(91)90068-B PG 5 WC Geosciences, Multidisciplinary SC Geology GA FM464 UT WOS:A1991FM46400013 ER PT J AU SRIVASTAVA, D GARRISON, BJ BRENNER, DW AF SRIVASTAVA, D GARRISON, BJ BRENNER, DW TI MODELING THE GROWTH OF SEMICONDUCTOR EPITAXIAL-FILMS VIA NANOSECOND TIME SCALE MOLECULAR-DYNAMICS SIMULATIONS SO LANGMUIR LA English DT Article ID SCANNING TUNNELING MICROSCOPY; INITIAL-STAGES; SILICON; SURFACES; SI(001); SI; POTENTIALS; DEPOSITION AB Microscopic and macroscopic growth mechanisms of semiconductor epitaxial films due to Si and Ge deposition on the dimer reconstructed Si{100}-(2 x 1) surface are modeled via molecular dynamics. The forces for solving the classical equations of motion are derived from Tersoff's many-body potential for the multicomponent Si-Ge system. In our model, thermally deposited Si and Ge atoms are allowed to react with the dimer reconstructed Si{100}-(2 x 1) surface for nanosecond durations. For the first time, the microscopic mechanisms of the unreconstruction of the original surface and macroscopic formation of the epilayers of the deposited material are extracted. We find that the dimer openings on the reconstructed surface following the Si or Ge deposition are either due to a diffusing adatom (the deposited atom) induced mechanism or due to a direct insertion of the incoming adatoms into the epitaxial positions. The results reveal a novel mechanism involving cooperative motion of adatoms in which diffusing adatoms move perpendicular to the direction of the dimer rows of the original surface. The resulting relaxation of the underneath substrate and dimer atoms causes the opening of successive dimers along the way. The mechanism is proposed to be responsible for the kinetics of a dramatic enhancement of the crystal growth process in one direction. This prediction has been recently confirmed by using the scanning tunneling microscope (STM). A total of three to six monolayers of epitaxial Si and Ge have been grown in the simulations. Two distinct layer by layer growth modes of macroscopic epitaxial films are observed. In one case the domains of amorphous regions in the growth remain roughly in the same area of the interface throughout the entire thickness. In the other example the reconstructions on the buried interfaces can be relieved by long time equilibrations. The epitaxially deposited films have a tendency to heal the inner layers during nanosecond time scale equilibrations. In accordance with the Rutherford backscattering experiments we also find that the reconstruction remains at the growing interface. C1 PENN STATE UNIV,DEPT CHEM,UNIVERSITY PK,PA 16802. USN,RES LAB,WASHINGTON,DC 20375. RI Brenner, Donald/D-1741-2009 NR 32 TC 11 Z9 11 U1 0 U2 3 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0743-7463 J9 LANGMUIR JI Langmuir PD APR PY 1991 VL 7 IS 4 BP 683 EP 692 DI 10.1021/la00052a016 PG 10 WC Chemistry, Multidisciplinary; Chemistry, Physical; Materials Science, Multidisciplinary SC Chemistry; Materials Science GA FH173 UT WOS:A1991FH17300016 ER PT J AU NGAI, KL SKOLNICK, J AF NGAI, KL SKOLNICK, J TI CORRESPONDENCE BETWEEN THE COUPLING MODEL PREDICTIONS AND COMPUTER-SIMULATIONS - DIFFUSION OF A PROBE POLYMER IN A MATRIX HAVING DIFFERENT DEGREES OF POLYMERIZATION SO MACROMOLECULES LA English DT Article ID CONDENSED MACROMOLECULAR SYSTEMS; LATTICE MULTICHAIN SYSTEMS; TIME DYNAMIC PROPERTIES; COOPERATIVE RELAXATIONS; SELF-DIFFUSION; MONTE-CARLO; MELTS; STATICS; CHAINS AB Detailed agreements between the predictions of the coupling model and the results of Monte Carlo simulations and a molecular dynamics simulation on the dynamics of the center-of-mass diffusion of entangled multichain systems are pointed out. These are further discussed in conjunction with real experimental data. C1 SCRIPPS RES INST, DEPT MOLEC BIOL, LA JOLLA, CA 92037 USA. SCRIPPS RES INST, DEPT CHEM, LA JOLLA, CA 92037 USA. RP USN, RES LAB, WASHINGTON, DC 20375 USA. NR 26 TC 28 Z9 28 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0024-9297 EI 1520-5835 J9 MACROMOLECULES JI Macromolecules PD APR 1 PY 1991 VL 24 IS 7 BP 1561 EP 1566 DI 10.1021/ma00007a018 PG 6 WC Polymer Science SC Polymer Science GA FE892 UT WOS:A1991FE89200018 ER PT J AU GERACI, JR RIDGWAY, SH AF GERACI, JR RIDGWAY, SH TI ON DISEASE TRANSMISSION BETWEEN CETACEANS AND HUMANS SO MARINE MAMMAL SCIENCE LA English DT Note C1 USN,SAN DIEGO,CA 92152. RP GERACI, JR (reprint author), ONTARIO VET COLL,GUELPH N1G 2W1,ONTARIO,CANADA. NR 17 TC 14 Z9 16 U1 0 U2 2 PU SOC MARINE MAMMALOGY PI LAWRENCE PA 1041 NEW HAMPSHIRE ST, LAWRENCE, KS 66044 SN 0824-0469 J9 MAR MAMMAL SCI JI Mar. Mamm. Sci. PD APR PY 1991 VL 7 IS 2 BP 191 EP 194 DI 10.1111/j.1748-7692.1991.tb00565.x PG 4 WC Marine & Freshwater Biology; Zoology SC Marine & Freshwater Biology; Zoology GA FK356 UT WOS:A1991FK35600008 ER PT J AU DOUBT, TJ HSIEH, SS AF DOUBT, TJ HSIEH, SS TI ADDITIVE EFFECTS OF CAFFEINE AND COLD WATER DURING SUBMAXIMAL LEG EXERCISE SO MEDICINE AND SCIENCE IN SPORTS AND EXERCISE LA English DT Article DE CATECHOLAMINES; GLUCOSE; FREE FATTY ACID; GLYCEROL; LACTATE; OXYGEN CONSUMPTION; CORE TEMPERATURE; HEART RATE; VENTILATION ID ENDURANCE PERFORMANCE; RESPONSES; INGESTION; TEMPERATURE; INTENSITY; MUSCLE; USERS; MALES AB Ten males exercised for 55 min at 1.5 W.kg-1 in 28-degrees-C and 18-degrees-C water to determine whether cold water plus caffeine (CF) ingestion had additive effects on energy production or core temperature. Two immersions were done at each water temperature, once with CF (5 mg.kg-1) and once with placebo (PL). Cold water alone (28 PL vs 18 PL) decreased free fatty acid (FFA, -13 +/- 8%) and glycerol (-37 +/- 15%) and increased lactate (18 +/- 12%), VO2 (11 +/- 3%), and minute ventilation (V(E), 8 +/- 4%) but did not change glucose, heart rate (HR), respiratory exchange ratio (RER), or rectal temperature. CF alone (28 PL vs 28 CF) increased FFA (52 +/- 18%), glycerol (14 +/- 8%), lactate (28 +/- 10%), VO2 (9 +/-3%), V(E) (7 +/- 5%), HR (4 +/- 1%), and rectal temperature (2 +/- 0.4%) but did not alter RER. Significant additive effects of cold water + CF (28 PL vs 18 CF) were noted for FFA, glycerol, lactate, VO2, and V(E) but not for RER and rectal temperature. These findings indicate that additive effects of cold water + CF alter substrate availability and increase energy production, but without a change in lipid utilization or core temperature. It may be concluded that use of CF during exercise in cold water has no physiological benefit. RP DOUBT, TJ (reprint author), USN,INST MED RES,DEPT DIVING MED,BETHESDA,MD 20814, USA. NR 34 TC 14 Z9 15 U1 1 U2 5 PU WILLIAMS & WILKINS PI BALTIMORE PA 351 WEST CAMDEN ST, BALTIMORE, MD 21201-2436 SN 0195-9131 J9 MED SCI SPORT EXER JI Med. Sci. Sports Exerc. PD APR PY 1991 VL 23 IS 4 BP 435 EP 442 PG 8 WC Sport Sciences SC Sport Sciences GA FG529 UT WOS:A1991FG52900008 PM 2056901 ER PT J AU MCINTYRE, JF GARRETT, RK CONRAD, RK AF MCINTYRE, JF GARRETT, RK CONRAD, RK TI PITTING CORROSION BEHAVIOR OF POWDER-METALLURGY MECHANICALLY ALLOYED IN-9052 SO METALLURGICAL TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE LA English DT Note ID ALUMINUM C1 USN,CTR SURFACE WARFARE,ELECTROCHEM BRANCH,SILVER SPRING,MD 20903. USN,CTR SURFACE WARFARE,MET MAT BRANCH,SILVER SPRING,MD 20903. RP MCINTYRE, JF (reprint author), FLORIDA ATLANTIC UNIV,DEPT OCEAN ENGN,BOCA RATON,FL 33433, USA. NR 17 TC 0 Z9 0 U1 1 U2 1 PU MINERALS METALS MATERIALS SOC PI WARRENDALE PA 420 COMMONWEALTH DR, WARRENDALE, PA 15086 SN 0360-2133 J9 METALL TRANS A PD APR PY 1991 VL 22 IS 4 BP 938 EP 941 DI 10.1007/BF02659004 PG 4 WC Materials Science, Multidisciplinary SC Materials Science GA FE739 UT WOS:A1991FE73900016 ER PT J AU ELSBERRY, RL DOBOS, PH BENBACON, A AF ELSBERRY, RL DOBOS, PH BENBACON, A TI LAGGED-AVERAGE PREDICTIONS OF TROPICAL CYCLONE TRACKS SO MONTHLY WEATHER REVIEW LA English DT Article ID FORECASTING FORECAST SKILL; MOTION; AIDS AB The lagged-average technique of combining a set of forecasts verifying at the same time is applied to tropical cyclone track prediction. Only a 3% improvement is achieved when the 24-h one-way tropical cyclone model (OTCM) forecasts are combined with unmodified track predictions verifying at t + 24 h. After statistically modifying the previous OTCM forecasts to take into account more recent information, the mean errors of the 24-h lagged-average forecast are reduced by 15% compared to the original 24-h OTCM. The departure of the 24-h OTCM forecast from the modified lagged-average forecast appears to be a useful predictor of whether the 24-h forecast errors will be below average, or above average. Thus, the lagged-average forecast approach appears to be useful for tropical cyclone track prediction. RP ELSBERRY, RL (reprint author), USN,POSTGRAD SCH,DEPT METEOROL,CODE MR ES,MONTEREY,CA 93943, USA. NR 14 TC 1 Z9 3 U1 0 U2 0 PU AMER METEOROLOGICAL SOC PI BOSTON PA 45 BEACON ST, BOSTON, MA 02108-3693 SN 0027-0644 J9 MON WEATHER REV JI Mon. Weather Rev. PD APR PY 1991 VL 119 IS 4 BP 1031 EP 1039 DI 10.1175/1520-0493(1991)119<1031:LAPOTC>2.0.CO;2 PG 9 WC Meteorology & Atmospheric Sciences SC Meteorology & Atmospheric Sciences GA FK704 UT WOS:A1991FK70400009 ER PT J AU LAND, DJ AF LAND, DJ TI CONTRASTS IN THE APPLICATION OF DISTORTION IN CALCULATIONS OF THE K-SHELL IONIZATION CROSS-SECTION SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS LA English DT Article; Proceedings Paper CT JOINT US/JAPAN SEMINAR ON DYNAMICAL EXCITATION BY EXOTIC AND HIGHLY CHARGED IONS CY JUN 18-22, 1990 CL ANCHORAGE, AK ID ION-ATOM COLLISIONS; PERTURBED STATIONARY-STATE; HEAVY CHARGED-PARTICLES; LIGHT-IONS; PROTONS; APPROXIMATION; POLARIZATION; ANTIPROTONS; IMPACT; HELIUM AB Two models which describe the proton-induced ionization from the K shell of an atom are contrasted in terms of the differing forms of distortion employed. Results of calculations of both total and differential cross section are seen to be surprisingly close despite the large disparity between the models. Some consequences are discussed, particularly with regard to the use of pseudostates to represent continuum states. RP LAND, DJ (reprint author), USN,CTR SURFACE WARFARE,SILVER SPRING,MD 20903, USA. NR 27 TC 0 Z9 0 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-583X J9 NUCL INSTRUM METH B JI Nucl. Instrum. Methods Phys. Res. Sect. B-Beam Interact. Mater. Atoms PD APR PY 1991 VL 53 IS 4 BP 448 EP 452 DI 10.1016/0168-583X(91)95424-C PG 5 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Atomic, Molecular & Chemical; Physics, Nuclear SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA FP552 UT WOS:A1991FP55200017 ER PT J AU SALINAS, D MARTO, PJ AF SALINAS, D MARTO, PJ TI ANALYSIS OF AN INTERNALLY FINNED ROTATING HEAT PIPE SO NUMERICAL HEAT TRANSFER PART A-APPLICATIONS LA English DT Article AB A conjugate heat transfer problem involving conduction heat transfer in the wall and film condensation on the inside of a finned, coaxial rotating heat pipe was solved numerically using a finite element technique. Results were obtained for a prescribed set of heat pipe operating parameters using water and Freon-113 as working fluids. The effects of the number of fins, the heat pipe rotational speed, and the magnitude of the outside heat transfer coefficient were studied, as well as the importance of wall thermal conductivity. The resulting methodology can be used to arrive at an optimum fin geometry for a particular application. RP SALINAS, D (reprint author), NAVAL POST GRAD SCH,DEPT MECH ENGN,MONTEREY,CA 93943, USA. NR 25 TC 6 Z9 6 U1 0 U2 0 PU HEMISPHERE PUBL CORP PI BRISTOL PA 1900 FROST ROAD, SUITE 101, BRISTOL, PA 19007-1598 SN 1040-7782 J9 NUMER HEAT TR A-APPL JI Numer. Heat Tranf. A-Appl. PD APR-MAY PY 1991 VL 19 IS 3 BP 255 EP 275 DI 10.1080/10407789108944849 PG 21 WC Thermodynamics; Mechanics SC Thermodynamics; Mechanics GA FH437 UT WOS:A1991FH43700001 ER PT J AU HEO, J SANGHERA, JS MACKENZIE, JD AF HEO, J SANGHERA, JS MACKENZIE, JD TI CHALCOHALIDE GLASSES FOR INFRARED FIBER OPTICS SO OPTICAL ENGINEERING LA English DT Article DE CHALCOHALIDE; INFRARED; GLASSES; FIBERS; PROPERTIES; STRUCTURE ID RAMAN-SPECTRA; HALIDE GLASSES; SYSTEM GLASSES; BR SYSTEM; S-BR; CHLOROSULFIDES; ABSORPTION; CHLORIDE; BROMIDE; MELTS AB Chalcohalide glasses are mixtures of chalcogenides and halides. This paper reviews the properties and structure of various glass-forming chalcohalide systems. These materials possess high transmittance in the infrared, which make them candidates for various applications in the area of infrared fiber optics. In general, the packing density, glass transition temperature (T(g)), and refractive indices decrease with the addition of a halogen component into binary chalcogenide glasses. It also seems to be theoretically possible that the attenuation loss of the glasses and fibers, especially at 10.6-mu-m, decreases at the same time. The observed changes in the properties of glasses are in good agreement with the proposed structural model, suggesting degradation of the network connectivity by the addition of network-terminating halogen atoms. C1 USN,RES LAB,WASHINGTON,DC 20375. UNIV CALIF LOS ANGELES,DEPT MAT SCI & ENGN,LOS ANGELES,CA 90024. RP HEO, J (reprint author), RUTGERS STATE UNIV,FIBER OPT MAT RES PROGRAM,POB 909,PISCATAWAY,NJ 08855, USA. NR 60 TC 11 Z9 11 U1 2 U2 7 PU SOC PHOTO-OPT INSTRUM ENG PI BELLINGHAM PA PO BOX 10, BELLINGHAM, WA 98227-0010 SN 0091-3286 J9 OPT ENG JI Opt. Eng. PD APR PY 1991 VL 30 IS 4 BP 470 EP 479 DI 10.1117/12.55824 PG 10 WC Optics SC Optics GA FF497 UT WOS:A1991FF49700016 ER PT J AU DICK, D HANSON, F AF DICK, D HANSON, F TI M-MODES IN A DIODE SIDE-PUMPED ND-GLASS SLAB LASER SO OPTICS LETTERS LA English DT Article ID NEODYMIUM AB We have operated a pulsed Nd:glass slab laser in a hemiconfocal cavity with beam stops to produce a multibounce beam in the shape of the letter M. This configuration permits the extraction of diffraction-limited beams from a large volume of the slab. The output of the slab was in four beams, and the optical slope efficiency was 14%. RP DICK, D (reprint author), USN,CTR OCEAN SYST,SAN DIEGO,CA 92152, USA. NR 7 TC 7 Z9 7 U1 0 U2 1 PU OPTICAL SOC AMER PI WASHINGTON PA 2010 MASSACHUSETTS AVE NW, WASHINGTON, DC 20036 SN 0146-9592 J9 OPT LETT JI Opt. Lett. PD APR 1 PY 1991 VL 16 IS 7 BP 476 EP 477 DI 10.1364/OL.16.000476 PG 2 WC Optics SC Optics GA FD812 UT WOS:A1991FD81200012 PM 19773971 ER PT J AU BRINK, DA BALSARA, ZN AF BRINK, DA BALSARA, ZN TI PRENATAL ULTRASOUND DETECTION OF INTRAABDOMINAL PULMONARY SEQUESTRATION WITH POSTNATAL MRI CORRELATION SO PEDIATRIC RADIOLOGY LA English DT Note AB Extralobar pulmonary sequestration is part of the spectrum of bronchopulmonary-foregut malformations. Intra-abdominal pulmonary sequestration has been described as a cause of a fetal abdominal mass [1-3]. We report a case of intra-abdominal pulmonary sequestration with associated elements of cystic adenomatoid malformation and a gastric duplication cyst detected on prenatal ultrasound with postnatal magnetic resonance imaging correlation. C1 USN HOSP,DEPT CLIN INVEST,SAN DIEGO,CA 92134. USN HOSP,DEPT RADIOL,SAN DIEGO,CA 92134. NR 5 TC 32 Z9 32 U1 0 U2 1 PU SPRINGER VERLAG PI NEW YORK PA 175 FIFTH AVE, NEW YORK, NY 10010 SN 0301-0449 J9 PEDIATR RADIOL JI Pediatr. Radiol. PD APR PY 1991 VL 21 IS 3 BP 227 EP 227 DI 10.1007/BF02011055 PG 1 WC Pediatrics; Radiology, Nuclear Medicine & Medical Imaging SC Pediatrics; Radiology, Nuclear Medicine & Medical Imaging GA FF522 UT WOS:A1991FF52200019 PM 2047166 ER PT J AU BONTA, BW STOBIE, PE GREENWALD, J AF BONTA, BW STOBIE, PE GREENWALD, J TI ADMINISTRATION OF EXOSURF DOES NOT ALTER TIMING OF OCCURRENCE OF PHYSIOLOGICAL DIURESIS DURING TREATMENT OF RESPIRATORY-DISTRESS SYNDROME SO PEDIATRIC RESEARCH LA English DT Meeting Abstract C1 NAVAL HOSP,DEPT PEDIAT,PORTSMOUTH,VA 23708. NR 0 TC 0 Z9 0 U1 0 U2 0 PU WILLIAMS & WILKINS PI BALTIMORE PA 351 WEST CAMDEN ST, BALTIMORE, MD 21201-2436 SN 0031-3998 J9 PEDIATR RES JI Pediatr. Res. PD APR PY 1991 VL 29 IS 4 BP A309 EP A309 PN 2 PG 1 WC Pediatrics SC Pediatrics GA FE038 UT WOS:A1991FE03801835 ER PT J AU KATONA, I HALISTA, S AHRONOVICH, M KIANG, E ELMOHANDES, A JUNE, C MOND, J AF KATONA, I HALISTA, S AHRONOVICH, M KIANG, E ELMOHANDES, A JUNE, C MOND, J TI ACTIVATION OF HUMAN CORD BLOOD (CB) B-CELLS BY ANTIIMMUNOGLOBULIN (IG) ANTIBODIES COUPLED TO DEXTRAN SO PEDIATRIC RESEARCH LA English DT Meeting Abstract C1 UNIFORMED SERV UNIV HLTH SCI,BETHESDA,MD 20814. GEORGE WASHINGTON UNIV,WASHINGTON,DC 20052. USN,BETHESDA,MD. NR 0 TC 0 Z9 0 U1 0 U2 0 PU WILLIAMS & WILKINS PI BALTIMORE PA 351 WEST CAMDEN ST, BALTIMORE, MD 21201-2436 SN 0031-3998 J9 PEDIATR RES JI Pediatr. Res. PD APR PY 1991 VL 29 IS 4 BP A159 EP A159 PN 2 PG 1 WC Pediatrics SC Pediatrics GA FE038 UT WOS:A1991FE03800933 ER PT J AU MINK, RB DUTKA, AJ HALLENBECK, JM AF MINK, RB DUTKA, AJ HALLENBECK, JM TI HYPERBARIC-OXYGEN AFTER GLOBAL CEREBRAL-ISCHEMIA IN RABBITS IMPROVES RECOVERY OF SOMATOSENSORY EVOKED POTENTIAL(SEP) SO PEDIATRIC RESEARCH LA English DT Meeting Abstract C1 USN,MED RES INST,BETHESDA,MD 20814. GEORGETOWN UNIV,CHILDRENS NATL MED CTR,SCH MED,DEPT CRIT CARE MED,WASHINGTON,DC 20057. NR 0 TC 0 Z9 0 U1 0 U2 0 PU WILLIAMS & WILKINS PI BALTIMORE PA 351 WEST CAMDEN ST, BALTIMORE, MD 21201-2436 SN 0031-3998 J9 PEDIATR RES JI Pediatr. Res. PD APR PY 1991 VL 29 IS 4 BP A361 EP A361 PN 2 PG 1 WC Pediatrics SC Pediatrics GA FE038 UT WOS:A1991FE03802147 ER PT J AU PIESTRUP, MA BOYERS, DG PINCUS, CI HARRIS, JL MARUYAMA, XK BERGSTROM, JC CAPLAN, HS SILZER, RM SKOPIK, DM AF PIESTRUP, MA BOYERS, DG PINCUS, CI HARRIS, JL MARUYAMA, XK BERGSTROM, JC CAPLAN, HS SILZER, RM SKOPIK, DM TI QUASI-MONOCHROMATIC X-RAY SOURCE USING PHOTOABSORPTION-EDGE TRANSITION RADIATION SO PHYSICAL REVIEW A LA English DT Article ID MEDIUM-ENERGY ELECTRONS AB By designing transition radiators to emit x rays at the foil material's K-, L-, M-shell photoabsorption edge, the x-ray spectrum is narrowed. The source is quasimonochromatic, directional, and intense and uses an electron beam whose energy is considerably lower than that needed for synchrotron sources. Depending upon the selection of foil material, the radiation can be produced wherever there is a photoabsorption edge. In this paper we report the results of the measurement of the x-ray spectrum from a transition radiator composed of 10 foils of 2-mu-m titanium and exposed to low-current, 90.2-MeV electrons. The measured band of emission was from 3.2 to 5 keV. In addition, a measurement was performed of the total power from a transition radiator composed of 18 foils of 2.0-mu-m copper exposed to a high-average-current electron beam of 40-mu-A and at energies of 135, 172, and 200 MeV. The maximum measured power was 4.0 mW. The calculated band of emission was from 4 to 9 keV. C1 USN,POSTGRAD SCH,MONTEREY,CA 93943. UNIV SASKATCHEWAN,SASKATCHEWAN ACCELERATOR LAB,SASKATOON S7N 0W0,SASKATCHEWAN,CANADA. RP PIESTRUP, MA (reprint author), ADELPHI TECHNOL INC,285 HAMILTON AVE,SUITE 430,PALO ALTO,CA 94301, USA. NR 18 TC 21 Z9 22 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1050-2947 J9 PHYS REV A JI Phys. Rev. A PD APR 1 PY 1991 VL 43 IS 7 BP 3653 EP 3661 DI 10.1103/PhysRevA.43.3653 PG 9 WC Optics; Physics, Atomic, Molecular & Chemical SC Optics; Physics GA FG216 UT WOS:A1991FG21600053 ER PT J AU GRISCOM, DL FRIEBELE, EJ AF GRISCOM, DL FRIEBELE, EJ TI COMPUTER-SIMULATION ANALYSIS OF THE ESR-SPECTRA OF V-TYPE CENTERS IN IRRADIATED HEAVY-METAL FLUORIDE GLASSES SO PHYSICAL REVIEW B LA English DT Article ID ZRF4 BASED GLASSES; DEFECT CENTERS; RADIATION AB Computer line-shape simulations were carried out on the electron-spin-resonance spectra of several heavy-metal fluoride glasses following exposure to ioniziong radiation at cryogenic temperatures. The primary objects of this study were certain spectra circumstantially attributable to holes trapped on a cluster of two or more inequivalent fluoride or foreign halide ions. The earlier attribution of certain spectral features to FCl- and FBr- species was confirmed in Cl- and Br-doped glasses, respectively, although the simulations show that FCl- in the glasses has a structure quite different from the same species in mixed alkali halide crystals. Two other spectra-universally observed in irradiated glasses composed of ZrF4 (or HfF4), BaF2, and virtually any number of other fluoride constituents-were also examined in detail. The previous assignment of one of these spectral components to F2- molecular ions is sustained, although the specific nature of these defects is now argued to be interstitial fluorine atoms in configurations analogous to V(KA) and V(H) centers (rather than V(K) centers) in the alkaline-earth fluorides. The second ubiquitous component, which was previously ascribed to "interstitial F0," is demonstrated to arise from an F3(2-) species similar to the V(t) center in LiF. The F2- and F3(2-) can be thought of as "on-center" and "off-center" configurations of the interstitial fluorine atom, and it appears that the former may undergo a thermal transmutation into the latter. RP GRISCOM, DL (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 23 TC 12 Z9 13 U1 2 U2 3 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD APR 1 PY 1991 VL 43 IS 10 BP 7427 EP 7441 DI 10.1103/PhysRevB.43.7427 PN A PG 15 WC Physics, Condensed Matter SC Physics GA FE549 UT WOS:A1991FE54900007 ER PT J AU ESTALJI, S KANERT, O STEINERT, J JAIN, H NGAI, KL AF ESTALJI, S KANERT, O STEINERT, J JAIN, H NGAI, KL TI UNCOMMON NUCLEAR-SPIN RELAXATION IN FLUOROZIRCONATE GLASSES AT LOW-TEMPERATURES SO PHYSICAL REVIEW B LA English DT Article ID LATTICE-RELAXATION; NMR EVIDENCE; FLUORIDE; MOTION AB The temperature and frequency dependence of Li-7, F-19, and Na-23 nuclear-spin relaxation (NSR) has been studied in various fluorozirconate (Zr-F) glasses between about 0.4 and 600 K. Below about 200 K the NSR is caused by low-frequency excitations of disordered modes intrinsic to the glassy state, which induce transitions between the nuclear-spin levels. In strong contrast to oxide glasses, however, the NSR rates in Zr-F glasses exhibit a significant peak around 15 K. The findings can be explained quantitatively by thermally activated excitations of two different types of disordered modes. The relative magnitude of NSR rate peaks of Li-7, F-19, and Na-23 suggests that the mode, which is responsible for the observed peak, is due to localized motions of a fraction of the fluorine atoms. C1 LEHIGH UNIV,DEPT MAT SCI & ENGN,BETHLEHEM,PA 18015. USN,RES LAB,WASHINGTON,DC 20375. RP ESTALJI, S (reprint author), UNIV DORTMUND,INST PHYS,W-4600 DORTMUND 50,GERMANY. NR 27 TC 47 Z9 47 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 APR 1 PY 1991 VL 43 IS 10 BP 7481 EP 7486 DI 10.1103/PhysRevB.43.7481 PN A PG 6 WC Physics, Condensed Matter SC Physics GA FE549 UT WOS:A1991FE54900012 ER PT J AU TOLPIN, AE AF TOLPIN, AE TI EFFECTS OF CHARGING-ENERGY FLUCTUATIONS ON AN ANOMALOUS BEHAVIOR OF MESOSCOPIC JOSEPHSON-JUNCTIONS SO PHYSICAL REVIEW B LA English DT Article AB A theory is proposed for mesoscopic Josephson junctions in the low-temperature intermediate quantum regime in which such junctions are characterized by a large single-electron charging energy E(c) that is of the order of the Josephson energy, E(J). This contrasts with the classical Josephson junctions where the Josephson energy E(J) is usually dominant. In this intermediate regime the phase difference of the order parameters for left and right superconductors is no longer localized. In particular, it is believed that at low temperature the quantum phase fluctuations play a very important role. By employing functional-integral methods to the junction Hamiltonian, the resistive regimes of the mesoscopic Josephson junctions below the critical current are studied. It is shown that the Josephson current acquires a spectral decomposition, characterized by the spectral width DELTA-omega. The relative values of DELTA-omega and the voltage V are shown to determine the resistive regimes in the junction. RP TOLPIN, AE (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. 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 APR 1 PY 1991 VL 43 IS 10 BP 7695 EP 7706 DI 10.1103/PhysRevB.43.7695 PN A PG 12 WC Physics, Condensed Matter SC Physics GA FE549 UT WOS:A1991FE54900037 ER PT J AU PEACOR, SD COHN, JL UHER, C AF PEACOR, SD COHN, JL UHER, C TI EFFECT OF MAGNETIC-FIELD ON THERMAL-CONDUCTIVITY OF YBA2CU3O7-DELTA SINGLE-CRYSTALS SO PHYSICAL REVIEW B LA English DT Note AB We report measurements of the thermal conductivity in a magnetic field on single crystals of YBa2Cu3O7-delta. Unlike in sintered samples, the zero-field thermal conductivity of these crystals above the superconducting transition temperature shows a marked decrease with increasing temperature, demonstrating the importance of phonon-phonon processes and the high quality of the crystals. We find that the thermal conductivity kappa is very sensitive to the presence of fluxoids which are strong scatterers of phonons. The degradation of kappa is particularly large when the magnetic field H is oriented perpendicular to the Cu-O planes. The anisotropic behavior of kappa-(H) is in qualitative agreement with a geometric argument based on the antisotropy of the superconducting coherence length. We detect hysteresis at the level of several percent in the dependence of kappa on the field. C1 USN,RES LAB,MAT PHYS BRANCH,WASHINGTON,DC 20375. RP PEACOR, SD (reprint author), UNIV MICHIGAN,DEPT PHYS,ANN ARBOR,MI 48109, USA. NR 11 TC 48 Z9 48 U1 0 U2 3 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD APR 1 PY 1991 VL 43 IS 10 BP 8721 EP 8724 DI 10.1103/PhysRevB.43.8721 PN B PG 4 WC Physics, Condensed Matter SC Physics GA FE551 UT WOS:A1991FE55100097 ER PT J AU JIANG, H HUANG, Y HOW, H ZHANG, S VITTORIA, C WIDOM, A CHRISEY, DB HORWITZ, JS LEE, R AF JIANG, H HUANG, Y HOW, H ZHANG, S VITTORIA, C WIDOM, A CHRISEY, DB HORWITZ, JS LEE, R TI OBSERVATION OF ULTRAHIGH CRITICAL CURRENT DENSITIES IN HIGH-TC SUPERCONDUCTING BRIDGE CONSTRICTIONS SO PHYSICAL REVIEW LETTERS LA English DT Article ID YBA2CU3O7 FILMS; BOUNDARIES AB Narrow bridge structures were precisely fabricated (using novel ion-beam-milling techniques) on pulsed-laser-deposited YBa2Cu3O7 films. The bridges have a length scale down to L congruent-to 500 angstrom. Supercurrents were observed to flow across the bridge structures with critical current densities up to J(c) congruent-to 1.3 x 10(9) A/cm2, the highest critical current densities yet reported. The current-density magnitudes are consistent with the Onsager-Feynman vortex-ring-creation mechanism (for producing voltages across narrow constrictions) in the length scale region of zeta << L less-than-or-equal-to LAMBDA, with zeta the coherence length and LAMBDA the London penetration depth. The highest J(c) is in good agreement with the critical depairing mechanism. C1 NORTHEASTERN UNIV,DEPT PHYS,BOSTON,MA 02115. USN,RES LAB,WASHINGTON,DC 20375. MICRION CORP,PEABODY,MA 01960. RP JIANG, H (reprint author), NORTHEASTERN UNIV,DEPT ELECT ENGN,BOSTON,MA 02115, USA. NR 8 TC 57 Z9 59 U1 1 U2 6 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0031-9007 J9 PHYS REV LETT JI Phys. Rev. Lett. PD APR 1 PY 1991 VL 66 IS 13 BP 1785 EP 1788 DI 10.1103/PhysRevLett.66.1785 PG 4 WC Physics, Multidisciplinary SC Physics GA FD899 UT WOS:A1991FD89900035 ER PT J AU GARDNER, JH BODNER, SE DAHLBURG, JP AF GARDNER, JH BODNER, SE DAHLBURG, JP TI NUMERICAL-SIMULATION OF ABLATIVE RAYLEIGH-TAYLOR INSTABILITY SO PHYSICS OF FLUIDS B-PLASMA PHYSICS LA English DT Article ID INDUCED SPATIAL INCOHERENCE; GROWTH-RATE; TARGETS; FUSION; PLASMAS; STABILIZATION AB Numerical simulations over a wide range of parameters of the linear stability of an ablating laser-produced plasma show a linear decrease in the growth rate with increasing ablation velocity. Simulations in planar and spherical geometries, with red and blue laser light, at high and low intensities, and at high and low accelerations, all seem to nearly follow a consistent law upsilon = 0.9 square-root kg - 3kv(a), when v(a) is defined as the mass ablation rate divided by the peak density, in agreement with the eigenvalue analysis of Takabe and co-workers. RP GARDNER, JH (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 22 TC 66 Z9 66 U1 0 U2 2 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0899-8221 J9 PHYS FLUIDS B-PLASMA PD APR PY 1991 VL 3 IS 4 BP 1070 EP 1074 DI 10.1063/1.859835 PG 5 WC Physics, Fluids & Plasmas SC Physics GA FD801 UT WOS:A1991FD80100024 ER PT J AU PERRY, SM AF PERRY, SM TI KUDOS FOR TRAINING COURSES SO PLATING AND SURFACE FINISHING LA English DT Letter RP PERRY, SM (reprint author), USN,CTR AVION,DEPT NAVY,INDIANAPOLIS,IN 46219, USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER ELECTROPLATERS SOC INC PI ORLANDO PA 12644 RESEARCH PKWY, ORLANDO, FL 32826-3298 SN 0360-3164 J9 PLAT SURF FINISH JI Plat. Surf. Finish. PD APR PY 1991 VL 78 IS 4 BP 16 EP 16 PG 1 WC Metallurgy & Metallurgical Engineering; Materials Science, Coatings & Films SC Metallurgy & Metallurgical Engineering; Materials Science GA FF150 UT WOS:A1991FF15000005 ER PT J AU MALIK, A EGAN, JE HOUGHTEN, RA SADOFF, JC HOFFMAN, SL AF MALIK, A EGAN, JE HOUGHTEN, RA SADOFF, JC HOFFMAN, SL TI HUMAN CYTOTOXIC LYMPHOCYTES-T AGAINST THE PLASMODIUM-FALCIPARUM CIRCUMSPOROZOITE PROTEIN SO PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA LA English DT Article DE MALARIA; SPOROZOITE; TRANSFECTION; PROTECTIVE IMMUNITY; VACCINE ID MALARIA SPOROZOITES; CELLS; EPITOPE; VIRUS; SPECIFICITY; PARASITE; ANTIGEN; GENE AB Cytotoxic T lymphocytes (CTL) against the circumsporozoite (CS) protein of malaria sporozoites protect against malaria in rodents. Although there is interest in developing human vaccines that induce CTL against the Plasmodium falciparum CS protein, humans have never been shown to produce CTL against any Plasmodium species protein or other parasite protein. We report that when peripheral blood mononuclear cells (PBMC) from three of four volunteers immunized with irradiated P. falciparum sporozoites were stimulated in vitro with a recombinant vaccinia virus expressing the P. falciparum CS protein or a peptide including only amino acids 368-390 of the P. falciparum CS protein [CS-(368-390)], the PBMC lysed autologous Epstein-Barr virus-transformed B cells transfected with the P. falciparum CS protein gene or incubated with CS-(368-390) tricosapeptide. Activity was antigen specific, genetically restricted, and dependent on CD8+ T cells. In one volunteer, seven peptides reflecting amino acids 311-400 were tested, and, as in B10.BR mice, CTL activity was only associated with the CS-(368-390) peptide. Development of an assay for studying human CTL against the CS and other malaria proteins and a method for constructing target cells by direct gene transfection provide a foundation for studying the role of CTL in protection against malaria. C1 USN,MED RES INST,MALARIA PROGRAM,BETHESDA,MD 20889. TORREY PINES INST MOLEC STUDIES,SAN DIEGO,CA 92121. WALTER REED ARMY MED CTR,DIV COMMUNICABLE DIS & IMMUNOL,WASHINGTON,DC 20307. NR 27 TC 147 Z9 147 U1 1 U2 3 PU NATL ACAD SCIENCES PI WASHINGTON PA 2101 CONSTITUTION AVE NW, WASHINGTON, DC 20418 SN 0027-8424 J9 P NATL ACAD SCI USA JI Proc. Natl. Acad. Sci. U. S. A. PD APR PY 1991 VL 88 IS 8 BP 3300 EP 3304 DI 10.1073/pnas.88.8.3300 PG 5 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA FG913 UT WOS:A1991FG91300070 PM 1707538 ER PT J AU LEGAN, JM BURKHARD, TK GOFF, WB BALSARA, ZN MARTINEZ, AJ BURKS, DD KALLMAN, DA OBRIEN, TJ LAPOINT, JM AF LEGAN, JM BURKHARD, TK GOFF, WB BALSARA, ZN MARTINEZ, AJ BURKS, DD KALLMAN, DA OBRIEN, TJ LAPOINT, JM TI TEARS OF THE GLENOID LABRUM - MR IMAGING OF 88 ARTHROSCOPICALLY CONFIRMED CASES SO RADIOLOGY LA English DT Article DE SHOULDER, ABNORMALITIES; SHOULDER, INJURIES; SHOULDER, MR STUDIES ID ROTATOR CUFF TEARS; GLENOHUMERAL JOINT; NORMAL SHOULDER; ANTERIOR DISLOCATION; ARTHROGRAPHY; DIAGNOSIS; CT AB Two hundred eighty-one patients underwent magnetic resonance (MR) imaging of the shoulder over a 2-year period. Eighty-eight patients underwent arthroscopic surgery, and their surgical results were correlated with the findings at MR imaging. MR imaging enabled accurate prediction of anterior labral tears, with a sensitivity of 95%, a specificity of 86%, and an accuracy of 92%. MR imaging was less effective in the prediction of tears of the superior labrum, with a sensitivity of 75%, a specificity of 99%, and an accuracy of 95%. These two categories accounted for the majority of the surgically correctable disease. MR imaging was found to be unreliable in the prediction of posterior (sensitivity, 7.7%) or inferior (sensitivity, 40%) labral tears, isolated cases of which occurred in only two (2%) of those undergoing surgery. MR imaging proved to be a highly accurate, noninvasive technique for the clinical evaluation of shoulder instability. C1 USN HOSP,DEPT RADIOL,SAN DIEGO,CA 92134. USN HOSP,DEPT ORTHOPED,SAN DIEGO,CA 92134. RP LEGAN, JM (reprint author), USN HOSP,DEPT CLIN INVEST,SAN DIEGO,CA 92134, USA. NR 22 TC 149 Z9 150 U1 0 U2 2 PU RADIOLOGICAL SOC NORTH AMER PI EASTON PA 20TH AND NORTHAMPTON STS, EASTON, PA 18042 SN 0033-8419 J9 RADIOLOGY JI Radiology PD APR PY 1991 VL 179 IS 1 BP 241 EP 246 PG 6 WC Radiology, Nuclear Medicine & Medical Imaging SC Radiology, Nuclear Medicine & Medical Imaging GA FC883 UT WOS:A1991FC88300047 PM 2006284 ER PT J AU KIM, KH BELL, MI DOZIER, CM FREITAG, RK BOULDIN, CE AF KIM, KH BELL, MI DOZIER, CM FREITAG, RK BOULDIN, CE TI CORRECTING FOR X-RAY-ENERGY CALIBRATION ERROR CAUSED BY MISALIGNMENT OF A RIGHT-ANGLE LINKAGE MONOCHROMATOR SO REVIEW OF SCIENTIFIC INSTRUMENTS LA English DT Article ID SYNCHROTRON RADIATION AB Small alignment errors of right-angle linkage monochromators typical to many x-ray absorption fine structure beamlines can cause significant errors in the energy calibrations. A 1-degrees misalignment produces errors greater than 1 keV over the hard x-ray operating range of a typical monochromator. The energy error caused by such misalignments is analyzed and its mathematical form given. The error can be corrected by inverting the expression and the amount of misalignment determined by accurate energy measurements at a few points. The accuracy of the corrections is tested. The effects of this error on x-ray absorption fine structure data and their interpretation are also discussed. C1 NATL INST STAND & TECHNOL,GAITHERSBURG,MD 20899. RP KIM, KH (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 4 TC 2 Z9 2 U1 0 U2 0 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0034-6748 J9 REV SCI INSTRUM JI Rev. Sci. Instrum. PD APR PY 1991 VL 62 IS 4 BP 982 EP 985 DI 10.1063/1.1141988 PG 4 WC Instruments & Instrumentation; Physics, Applied SC Instruments & Instrumentation; Physics GA FF017 UT WOS:A1991FF01700018 ER PT J AU CLAASSEN, JH REEVES, ME SOULEN, RJ AF CLAASSEN, JH REEVES, ME SOULEN, RJ TI A CONTACTLESS METHOD FOR MEASUREMENT OF THE CRITICAL CURRENT-DENSITY AND CRITICAL-TEMPERATURE OF SUPERCONDUCTING FILMS SO REVIEW OF SCIENTIFIC INSTRUMENTS LA English DT Article ID THIN-FILMS AB A new method is described for measuring the critical current density and transition temperature of a superconducting film without making contact to it or modifying it in any way. This technique is particularly well suited for use with high transition temperature oxide films which are notoriously irreproducible and sensitive to patterning. It consists of positioning a flat, multiturn coil near the film surface and driving the coil with an audio frequency sine-wave current. Induced shielding currents flow in the film. We have calculated the radial dependence of the induced currents and show that the induced current density is zero at the coil center, rises to a maximum near the mean radius of the drive coil, and then falls off rapidly as the radius continues to increase. A measurement of the critical current per length can be obtained by monitoring the development of odd harmonic voltage components across the coil as the drive current is increased. We find that this measure of nonlinearity in the coil-film system increases abruptly when the maximum induced current equals the critical current. The critical current obtained by this inductive measurement has been demonstrated to give nearly the same value as that obtained by a transport measurement. Other advantages to this inductive measurement approach include: sensitivity only to intergranular critical current, and an ability to accommodate large substrates. Finally, with only minor modification to the electronics used to measure J(c), the superconducting transition temperature of the sample may be measured as well. RP CLAASSEN, JH (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 17 TC 251 Z9 253 U1 0 U2 14 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0034-6748 J9 REV SCI INSTRUM JI Rev. Sci. Instrum. PD APR PY 1991 VL 62 IS 4 BP 996 EP 1004 DI 10.1063/1.1141991 PG 9 WC Instruments & Instrumentation; Physics, Applied SC Instruments & Instrumentation; Physics GA FF017 UT WOS:A1991FF01700022 ER PT J AU SKOVE, MJ TRITT, TM EHRLICH, AC DAVIS, HS AF SKOVE, MJ TRITT, TM EHRLICH, AC DAVIS, HS TI DEVICE FOR SIMULTANEOUSLY MEASURING STRESS, STRAIN, AND RESISTANCE IN WHISKERLIKE MATERIALS IN THE TEMPERATURE-RANGE 1.5-K-LESS-THAN-T-LESS-THAN-360-K SO REVIEW OF SCIENTIFIC INSTRUMENTS LA English DT Article ID SUPERCONDUCTING TRANSITION-TEMPERATURE; DENSITY-WAVE TRANSITION; ELASTIC PROPERTIES; TAS3; DEPENDENCE; CONDUCTORS; ANOMALIES; MODULUS; NBSE3 AB We describe a device for measuring Young's modulus Y and the piezoresistance of "whiskerlike" samples. The device can be used in a standard vari-temp Dewar in the temperature range 1.5 K < T < 360 K. One end of the sample is attached to a movable rod suspended by leaf springs and the other end is held fixed. Force is applied to the rod by a coaxial electromagnet acting on permanent magnets attached to the rod. Displacements are measured with a capacitive technique. We have used the device to measure Young's modulus for the charge density wave material TaS3. We also measured the Young's modulus of some Cu whiskers for comparison. C1 CLEMSON UNIV,DEPT PHYS,CLEMSON,SC 29634. RP SKOVE, MJ (reprint author), USN,RES LAB,MAT PHYS BRANCH,CODE 6341,WASHINGTON,DC 20375, USA. NR 39 TC 15 Z9 15 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 APR PY 1991 VL 62 IS 4 BP 1010 EP 1014 DI 10.1063/1.1142050 PG 5 WC Instruments & Instrumentation; Physics, Applied SC Instruments & Instrumentation; Physics GA FF017 UT WOS:A1991FF01700024 ER PT J AU KALU, PN MCNELLEY, TR AF KALU, PN MCNELLEY, TR TI MICROSTRUCTURAL REFINEMENT BY THERMOMECHANICAL TREATMENT OF A CAST AND EXTRUDED 6061 AL-AL2O3 COMPOSITE SO SCRIPTA METALLURGICA ET MATERIALIA LA English DT Article ID METAL-MATRIX COMPOSITES; AL-MG ALLOY; ALUMINUM COMPOSITES; RECRYSTALLIZATION; SUPERPLASTICITY RP KALU, PN (reprint author), USN,POSTGRAD SCH,DEPT MECH ENGN,MONTEREY,CA 93940, USA. NR 20 TC 14 Z9 14 U1 2 U2 5 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0956-716X J9 SCRIPTA METALL MATER JI Scr. Metall. Materialia PD APR PY 1991 VL 25 IS 4 BP 853 EP 858 DI 10.1016/0956-716X(91)90237-U PG 6 WC Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Materials Science; Metallurgy & Metallurgical Engineering GA FE918 UT WOS:A1991FE91800018 ER PT J AU BHATIA, SK COONEY, MJ SHRIVERLAKE, LC FARE, TL LIGLER, FS AF BHATIA, SK COONEY, MJ SHRIVERLAKE, LC FARE, TL LIGLER, FS TI IMMOBILIZATION OF ACETYLCHOLINESTERASE ON SOLID-SURFACES - CHEMISTRY AND ACTIVITY STUDIES SO SENSORS AND ACTUATORS B-CHEMICAL LA English DT Article ID ENZYME ELECTRODES; CHOLINE AB A method for covalent attachment of the enzyme acetylcholinesterase (E.C. 3.1.1.7, Electric Eel) on two different solid surfaces (glass and platinum) is described. The chemistry includes covalent bond formation between a hydroxyl group on the surface, a thiol-terminal silane, a heterobifunctional crosslinker, and the enzyme. The activity of the immobilized enzyme has been determined spectrophotometrically using two different substrates, acetylcholine and butyrylthiocholine. It is determined that after immobilization, acetylcholinesterase retains at least 50% of its activity on glass and 15% of its activity on platinum surfaces when assayed using butyrylthiocholine as a substrate. The general procedure described here for the immobilization of enzymes should find broad use in the fabrication of enzyme electrodes and in biosensor technology. C1 USN,RES LAB,CTR BIOMOLEC SCI & ENGN,CODE 6090,WASHINGTON,DC 20375. GEOCENTERS INC,FT WASHINGTON,MD 20744. NR 18 TC 16 Z9 17 U1 0 U2 3 PU ELSEVIER SCIENCE SA LAUSANNE PI LAUSANNE 1 PA PO BOX 564, 1001 LAUSANNE 1, SWITZERLAND SN 0925-4005 J9 SENSOR ACTUAT B-CHEM JI Sens. Actuator B-Chem. PD APR PY 1991 VL 3 IS 4 BP 311 EP 317 DI 10.1016/0925-4005(91)80022-C PG 7 WC Chemistry, Analytical; Electrochemistry; Instruments & Instrumentation SC Chemistry; Electrochemistry; Instruments & Instrumentation GA GR368 UT WOS:A1991GR36800011 ER PT J AU ABDELHAMID, TK LEIDY, FH AF ABDELHAMID, TK LEIDY, FH TI AN EXPERT SIMULATOR FOR ALLOCATING THE QUALITY ASSURANCE EFFORT IN SOFTWARE-DEVELOPMENT SO SIMULATION LA English DT Software Review DE SOFTWARE QUALITY ASSURANCE; SOFTWARE PROJECT MANAGEMENT; SOFTWARE COST; SYSTEM DYNAMICS; SIMULATION AB Increasingly software quality assurance (QA) is being recognized as a critical factor in the successful development of software systems. However, because the utilization of QA tools and techniques adds significantly to the cost of developing software, the cost-effectiveness of QA has been a significant concern to the software quality manager. As of yet this concern has not been adequately addressed in the literature. The objective of this research effort is to develop an expert/simulator to support the QA effort allocation decision. The expert system module derives QA effort allocation schemes, feeds them into the simulation model for testing, and uses the feedback from the simulation results to improve upon the efficiency of the QA effort distribution. In a case study involving a NASA software project, the model accurately replicated the project's dynamic behavior. The expert/simulator was then capable of deriving a more cost effective QA policy that achieved a 26% reduction in total project cost. RP ABDELHAMID, TK (reprint author), USN,NAVAL POSTGRAD SCH,DEPT ADM SCI,MONTEREY,CA, USA. NR 23 TC 4 Z9 5 U1 4 U2 7 PU SIMULATION COUNCILS INC PI SAN DIEGO PA PO BOX 17900, SAN DIEGO, CA 92117 SN 0037-5497 J9 SIMULATION JI Simulation PD APR PY 1991 VL 56 IS 4 BP 233 EP 240 DI 10.1177/003754979105600407 PG 8 WC Computer Science, Interdisciplinary Applications; Computer Science, Software Engineering SC Computer Science GA FR692 UT WOS:A1991FR69200003 ER PT J AU GADRE, AK OLEARY, MJ ZAKHARY, R LINTHICUM, FH HOUSE, WF AF GADRE, AK OLEARY, MJ ZAKHARY, R LINTHICUM, FH HOUSE, WF TI THE LATERAL SKULL BASE - A VASCULAR PERSPECTIVE WITH CLINICAL IMPLICATIONS SO SKULL BASE SURGERY LA English DT Article ID CALVARIAL BONE FLAPS; CRANIOFACIAL RECONSTRUCTION; GRAFTS; FATE AB The growing number of options in the surgical management of skull base disease has renewed interest in the microvascular anatomy of the lateral temporal region. We studied this anatomy by injecting colored solutions of methyl methacrylate into the major blood vessels of six human cadaver heads or selectively into their major branches. We used several techniques to see the vascular anatomy and to study its relationship to the layers of the scalp. Results revealed that every anatomically named blood vessel was accompanied by a finer, deeper blood vessel supplying the periosteum and outer table of the skull. These vessels arborized into a network of capillaries in the periosteum adherent to the outer bony cortex, from which we saw tiny perforators entering bone. This layered blood supply has direct implications for both ablative and reconstructive surgery for skull base disease. We also saw a previously undescribed arterial plexus accompanying the commonly described venous plexus in the infratemporal fossa. C1 UNIV SO CALIF,SCH DENT,LOS ANGELES,CA 90089. HOUSE EAR CLIN,LOS ANGELES,CA. USN,MED CORPS,WASHINGTON,DC 20350. UNIV SO CALIF,SCH MED,LOS ANGELES,CA 90033. HEARING ASSOCIATES,NEWPORT BEACH,CA. RP GADRE, AK (reprint author), HOUSE EAR RES INST,MORPHOL LABS,2100 W 3RD ST,LOS ANGELES,CA 90057, USA. NR 22 TC 4 Z9 4 U1 0 U2 0 PU THIEME MEDICAL PUBL INC PI NEW YORK PA 381 PARK AVE SOUTH, NEW YORK, NY 10016 SN 1052-1453 J9 SKULL BASE SURG JI Skull Base Surg. PD APR PY 1991 VL 1 IS 2 BP 110 EP 116 DI 10.1055/s-2008-1056990 PG 7 WC Clinical Neurology; Otorhinolaryngology; Surgery SC Neurosciences & Neurology; Otorhinolaryngology; Surgery GA GN820 UT WOS:A1991GN82000007 PM 17170831 ER PT J AU PAK, YS ADAMIC, KJ GREENBAUM, SG WINTERSGILL, MC FONTANELLA, JJ COUGHLIN, CS AF PAK, YS ADAMIC, KJ GREENBAUM, SG WINTERSGILL, MC FONTANELLA, JJ COUGHLIN, CS TI COMPLEX IMPEDANCE AND MULTIFREQUENCY NA-23 NMR-STUDY OF POLY(PROPYLENE OXIDE) COMPLEXED WITH NAB(C6H5)4 SO SOLID STATE IONICS LA English DT Article ID ELECTRICAL-CONDUCTIVITY; IONIC-CONDUCTIVITY; HIGH-PRESSURE; NETWORKS; SODIUM; SALTS; DSC AB Complex impedance and multifrequency Na23 nuclear magnetic resonance (NMR) measurements on a poly (propylene oxide) :sodium tetraphenylborate, PPO8NaB(C6H5)4, solid polymer electrolyte, with a composition of eight ether oxygens per sodium, are reported. The NMR linewidths are found to be second-order quadrupole broadened, thus indicating low site-symmetry for the Na+ ions. The title compound exhibits some interesting differences in properties compared to other PPO-Na salt complexes, including an anomalously low value of the stretched exponential parameter beta-se (obtained in fits to electric modulus data), an unusually high glass transition temperature (T(g) = 306 K), and sub-T(g) line narrowing of lower frequency Na-23 resonances. This last phenomenon is attributed to strong interaction between the Na+ ions and their large [B(C6H5)4] - counterions caused by the localization of the [B(C6H5)4]- anions in weak interactions with the polymer chains which, in turn, leads to the elevated glass transition temperatures. C1 USN ACAD,ANNAPOLIS,MD 21402. RP PAK, YS (reprint author), CUNY HUNTER COLL,DEPT PHYS,NEW YORK,NY 10021, USA. NR 21 TC 15 Z9 15 U1 1 U2 4 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0167-2738 J9 SOLID STATE IONICS JI Solid State Ion. PD APR PY 1991 VL 45 IS 3-4 BP 277 EP 284 DI 10.1016/0167-2738(91)90162-5 PG 8 WC Chemistry, Physical; Physics, Condensed Matter SC Chemistry; Physics GA FK946 UT WOS:A1991FK94600012 ER PT J AU MELESE, F MICHEL, P AF MELESE, F MICHEL, P TI REVERSING THE ARMS-RACE - A DIFFERENTIAL GAME MODEL SO SOUTHERN ECONOMIC JOURNAL LA English DT Article C1 UNIV PARIS 01,F-75231 PARIS 05,FRANCE. RP MELESE, F (reprint author), NAVAL POST GRAD SCH,MONTEREY,CA, USA. NR 15 TC 4 Z9 4 U1 0 U2 0 PU UNIV NORTH CAROLINA PI CHAPEL HILL PA SOUTHERN ECONOMIC JOURNAL, CHAPEL HILL, NC 27514 SN 0038-4038 J9 SOUTHERN ECON J JI South. Econ. J. PD APR PY 1991 VL 57 IS 4 BP 1133 EP 1143 DI 10.2307/1060340 PG 11 WC Economics SC Business & Economics GA FF796 UT WOS:A1991FF79600019 ER PT J AU CRAIG, TJ MAGUIRE, FE WALLACE, MR AF CRAIG, TJ MAGUIRE, FE WALLACE, MR TI TRACHEOBRONCHITIS DUE TO CORYNEBACTERIUM-PSEUDODIPHTHERITICUM SO SOUTHERN MEDICAL JOURNAL LA English DT Article ID INFECTIONS C1 USN HOSP,DEPT CLIN INVEST,SAN DIEGO,CA 92134. USN HOSP,DEPT INTERNAL MED,SAN DIEGO,CA 92134. NR 9 TC 14 Z9 14 U1 0 U2 0 PU SOUTHERN MEDICAL ASSN PI BIRMINGHAM PA 35 LAKESHORE DR PO BOX 190088, BIRMINGHAM, AL 35219 SN 0038-4348 J9 SOUTHERN MED J JI South.Med.J. PD APR PY 1991 VL 84 IS 4 BP 504 EP 506 DI 10.1097/00007611-199104000-00026 PG 3 WC Medicine, General & Internal SC General & Internal Medicine GA FG629 UT WOS:A1991FG62900026 PM 2014440 ER PT J AU SINGER, A DAS, S AF SINGER, A DAS, S TI THERAPEUTIC DILEMMAS IN MANAGEMENT OF CYSTINE CALCULI SO UROLOGY LA English DT Article ID SHOCK-WAVE LITHOTRIPSY; DISSOLUTION; STONES; MERCAPTOPROPIONYLGLYCINE; TROMETHAMINE; DISTINCTION; IRRIGATION; EXCRETION; PATIENT; REMOVAL AB The appropriate management of patients with cystine calculi necessitates of fundamental understanding of the pathophysiology of cystinuria and a working knowledge of the available therapeutic modalities. The following case reports and review of the literature serve to illustrate that successful treatment involves a multidimensional approach to eradication of calculi with long-term follow-up aimed at prevention. C1 KAISER PERMANENTE HOSP,WALNUT CREEK,CA. USN,HOSP,OAKLAND,CA 94627. NR 48 TC 4 Z9 4 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 APR PY 1991 VL 37 IS 4 BP 322 EP 326 DI 10.1016/0090-4295(91)80257-8 PG 5 WC Urology & Nephrology SC Urology & Nephrology GA FG520 UT WOS:A1991FG52000006 PM 2014596 ER PT J AU SONNENSCHEIN, MF ROLAND, CM AF SONNENSCHEIN, MF ROLAND, CM TI INTERSEGMENTAL INTERACTION AND CRITICAL CONCENTRATIONS IN PET-HFIP SOLUTIONS SO JOURNAL OF POLYMER SCIENCE PART B-POLYMER PHYSICS LA English DT Article ID POLY(ETHYLENE-TEREPHTHALATE) FILMS; FLUORESCENCE; POLYMERS; AGGREGATION; DEPENDENCE; SOLVENT AB Spectroscopic determinations of the concentrations associated with the onset of intermolecular interaction in solutions of poly (ethylene terphthalate) (PET) are described. The intersegment forces perturb the electronic spectra and induce ground-state aggregation. These phenomena become observable at different chain densities, reflecting the influence of concentration on the coil dimensions, as well as the dynamical nature of the interactions. An estimate of the equilibrium constant for PET dimer formation in hexafluoroisopropanol is reported. C1 USN,RES LAB,DIV CHEM,WASHINGTON,DC 20375. NR 20 TC 6 Z9 6 U1 1 U2 3 PU JOHN WILEY & SONS INC PI NEW YORK PA 605 THIRD AVE, NEW YORK, NY 10158-0012 SN 0887-6266 J9 J POLYM SCI POL PHYS JI J. Polym. Sci. Pt. B-Polym. Phys. PD MAR 30 PY 1991 VL 29 IS 4 BP 431 EP 436 DI 10.1002/polb.1991.090290405 PG 6 WC Polymer Science SC Polymer Science GA EY248 UT WOS:A1991EY24800005 ER PT J AU EDELSTEIN, AS CHOW, GM ALTMAN, EI COLTON, RJ HWANG, DM AF EDELSTEIN, AS CHOW, GM ALTMAN, EI COLTON, RJ HWANG, DM TI SELF-ARRANGEMENT OF MOLYBDENUM PARTICLES INTO CUBES SO SCIENCE LA English DT Article ID SMOKE AB An unusual distribution of particle sizes has been observed following the formation of molybdenum particles by argon ion sputtering. Many of the molybdenum particles produced by sputtering at the threshold pressure for particle formation in the vapor appear to be single crystalline cubes. There are two prominent peaks in the edge length distribution of the cubes, one centered at 4.8 nanometers with a halfwidth of approximately 1.3 nanometers and the other at 17.5 nanometers. The peak for the larger cubes is approximately square and has a total width of 7.0 nanometers. Evidence is presented that the larger cubes are formed by a 3 by 3 by 3 self-arrangement of the smaller cubes, which contain approximately 7000 atoms. Self-arrangement in inorganic structures is normally only observed when the building blocks are atoms, molecules, or clusters of less than 100 atoms. C1 BELLCORE,RED BANK,NJ 07701. RP EDELSTEIN, AS (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 11 TC 17 Z9 17 U1 0 U2 2 PU AMER ASSOC ADVANCEMENT SCIENCE PI WASHINGTON PA 1200 NEW YORK AVE, NW, WASHINGTON, DC 20005 SN 0036-8075 J9 SCIENCE JI Science PD MAR 29 PY 1991 VL 251 IS 5001 BP 1590 EP 1592 DI 10.1126/science.251.5001.1590 PG 3 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA FD890 UT WOS:A1991FD89000030 PM 17793142 ER PT J AU KERSEY, AD AF KERSEY, AD TI DEMONSTRATION OF A HYBRID TIME/WAVELENGTH DIVISION MULTIPLEXED INTERFEROMETRIC FIBER SENSOR ARRAY SO ELECTRONICS LETTERS LA English DT Article DE OPTICAL FIBERS; OPTICAL SENSORS; MULTIPLEXERS AND MULTIPLEXING; INTERFEROMETERS ID CARRIER; SCHEME AB A 14-element interferometric sensor array based on a hybrid time/wavelength division addressing scheme is reported. The system uses two time-division addressed sub-arrays operating at 790 nm and 835 nm which are addressed via common input/output fibres using WDM couplers. Preliminary results obtained show crosstalk levels < -50 dB electrical. RP KERSEY, AD (reprint author), USN,RES LAB,OPT TECH BRANCH,CODE 6574,WASHINGTON,DC 20375, USA. NR 11 TC 5 Z9 5 U1 0 U2 0 PU IEE-INST ELEC ENG PI HERTFORD PA MICHAEL FARADAY HOUSE SIX HILLS WAY STEVENAGE, HERTFORD, ENGLAND SG1 2AY SN 0013-5194 J9 ELECTRON LETT JI Electron. Lett. PD MAR 28 PY 1991 VL 27 IS 7 BP 554 EP 555 DI 10.1049/el:19910349 PG 2 WC Engineering, Electrical & Electronic SC Engineering GA FG481 UT WOS:A1991FG48100004 ER PT J AU KERSEY, AD MARRONE, MJ DANDRIDGE, A AF KERSEY, AD MARRONE, MJ DANDRIDGE, A TI EXPERIMENTAL INVESTIGATION OF POLARIZATION-INDUCED FADING IN INTERFEROMETRIC FIBER SENSOR ARRAYS SO ELECTRONICS LETTERS LA English DT Article DE FIBER OPTICS; INTERFEROMETERS; POLARIZATION; OPTICAL SENSORS ID POLARIZATION AB The results of an experimental investigation of polarisation-induced fading in multiplexed optical fibre interferometric sensor arrays is presented. Measurements, made on a ten-element all-fibre time-division multiplexed array, are analysed in terms of a general N-sensor system and compared with a simple theoretical model. RP KERSEY, AD (reprint author), USN,RES LAB,DIV OPT SCI,CODE 6574,WASHINGTON,DC 20375, USA. NR 5 TC 5 Z9 6 U1 1 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 MAR 28 PY 1991 VL 27 IS 7 BP 562 EP 563 DI 10.1049/el:19910354 PG 2 WC Engineering, Electrical & Electronic SC Engineering GA FG481 UT WOS:A1991FG48100009 ER PT J AU HO, PTP HO, LC SZCZEPANSKI, JC JACKSON, JM ARMSTRONG, JT BARRETT, AH AF HO, PTP HO, LC SZCZEPANSKI, JC JACKSON, JM ARMSTRONG, JT BARRETT, AH TI A MOLECULAR GAS STREAMER FEEDING THE GALACTIC-CENTER SO NATURE LA English DT Article ID APERTURE SYNTHESIS OBSERVATIONS; IONIZED-GAS; A COMPLEX; SGR-A; ENVIRONMENT; SAGITTARIUS; GALAXY; CLOUD; DISK AB Radio maps of ammonia emission around the nucleus of the Milky Way reveal a long streamer of molecular gas connecting the well known circumnuclear 2-pc ring with molecular clouds 10-20 pc further out. These clouds appear to be interacting with nearby supernova remnants, suggesting that the impact of the supernovae on the gas may have impelled some of it inwards, thus providing a source of fuel for the activity at the Galactic Centre. C1 USN OBSERV,DEPT ASTRON,WASHINGTON,DC 20390. MIT,DEPT PHYS,CAMBRIDGE,MA 02139. BOSTON UNIV,DEPT ASTRON,BOSTON,MA 02215. RP HO, PTP (reprint author), HARVARD SMITHSONIAN CTR ASTROPHYS,CAMBRIDGE,MA 02138, USA. NR 16 TC 51 Z9 52 U1 0 U2 2 PU MACMILLAN MAGAZINES LTD PI LONDON PA 4 LITTLE ESSEX STREET, LONDON, ENGLAND WC2R 3LF SN 0028-0836 J9 NATURE JI Nature PD MAR 28 PY 1991 VL 350 IS 6316 BP 309 EP 312 DI 10.1038/350309a0 PG 4 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA FD838 UT WOS:A1991FD83800081 ER PT J AU STAUF, GT GASKILL, DK BOTTKA, N GEDRIDGE, RW AF STAUF, GT GASKILL, DK BOTTKA, N GEDRIDGE, RW TI LOW-TEMPERATURE ORGANOMETALLIC VAPOR-PHASE EPITAXY OF INSB USING THE NOVEL SB PRECURSOR TRIISOPROPYLANTIMONY SO APPLIED PHYSICS LETTERS LA English DT Article ID GROWTH AB InSb has been grown by organometallic vapor phase epitaxy using triisopropylantimony (TIPSb) and trimethylindium (TMIn) at temperatures as low as 300-degrees-C, the lowest yet reported for a stable Sb source. Unintentionally doped films were n type, and the best electronic transport result was obtained for a growth at 350-degrees-C yielding a 77 K carrier concentration of 3.7 X 10(16) cm-3 and mobility of 6.3 X 10(4) cm2/V s; these impurities are thought to be from the reagent grade chemicals used to synthesize the TIPSb. The morphology, growth rate, and transport properties of these films are reported as a function of growth temperature, molar ratios, and substrate (GaAs or InSb). By comparing these transport properties with Hall measurements of approximately 1-mu-m InSb epilayers on GaAs grown from trimethylantimony and TMIn, it was found that these properties were greatly improved because of the low-temperature epitaxy enabled by this source. C1 USN,CTR WEAP,CHINA LAKE,CA 93555. RP STAUF, GT (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 9 TC 36 Z9 36 U1 0 U2 1 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0003-6951 J9 APPL PHYS LETT JI Appl. Phys. Lett. PD MAR 25 PY 1991 VL 58 IS 12 BP 1311 EP 1313 DI 10.1063/1.104346 PG 3 WC Physics, Applied SC Physics GA FD368 UT WOS:A1991FD36800030 ER PT J AU KABACOFF, LT WONG, CP GUTHRIE, NL DALLEK, S AF KABACOFF, LT WONG, CP GUTHRIE, NL DALLEK, S TI FORMATION AND STABILITY OF MAGNETRON SPUTTERED AL-TM-RE METALLIC GLASSES SO MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING LA English DT Article; Proceedings Paper CT 7TH INTERNATIONAL CONF ON RAPIDLY QUENCHED MATERIALS CY AUG 13-17, 1990 CL STOCKHOLM, SWEDEN SP ALLIED SIGNAL, VACUUMSCHMELZE, SANDVIK, MATERIAL CENTER, SWEDISH NATL BOARD TECH DEV, ROYAL INT TECHNOL, CITY STOCKHOLM, STOCKHOLM COUNTY COUNCIL ID ALUMINUM; ALLOYS AB We have investigated the formation and stability of Al80Fe10Ce10, Al80Co10Ce10, and Al(x)(Fe0.5Gd0.5)100-x (x = 80.0, 81.8, 83.6, 85.4, 87.2, and 89.0) metallic glasses fabricated by magnetron sputtering. It was found that the glass-forming range of the sputtered alloys was narrower than that of melt-spun material. However, the thermal stability of the purely amorphous compositions was considerably better than that reported for the melt-spun glasses. It was found that replacing cerium with gadolinium greatly enhanced the thermal stability by increasing the activation energy without affecting the pre-exponential factor, while replacing iron with cobalt changed both parameters in a way that left the crystallization temperature relatively unaffected. High temperature differential thermal analysis measurements showed that the liquidus temperature of the three 80 at.% Al compositions was much higher than previously reported and was highly composition dependent, indicating that a eutectic may be present near the glass-forming regions of the ternary phase diagrams. RP KABACOFF, LT (reprint author), NAVAL SURFACE WARFARE CTR,SILVER SPRING,MD 20903, USA. NR 7 TC 18 Z9 18 U1 1 U2 3 PU ELSEVIER SCIENCE SA LAUSANNE PI LAUSANNE 1 PA PO BOX 564, 1001 LAUSANNE 1, SWITZERLAND SN 0921-5093 J9 MAT SCI ENG A-STRUCT JI Mater. Sci. Eng. A-Struct. Mater. Prop. Microstruct. Process. PD MAR 25 PY 1991 VL 134 BP 1288 EP 1291 DI 10.1016/0921-5093(91)90975-S PG 4 WC Nanoscience & Nanotechnology; Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Science & Technology - Other Topics; Materials Science; Metallurgy & Metallurgical Engineering GA FH740 UT WOS:A1991FH74000099 ER PT J AU GERBER, H AF GERBER, H TI PROBABILITY-DISTRIBUTION OF AEROSOL BACKSCATTER IN THE LOWER MARINE ATMOSPHERE AT CO2 WAVELENGTHS SO JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES LA English DT Article ID SIZE DISTRIBUTIONS; OPTICAL-PROPERTIES AB A model of the size distribution of marine aerosols, based on a large compilation of size distribution and meteorological measurements, is combined with the statistics of meteorological parameters over the North Atlantic Ocean to calculate probability distributions of the aerosol backscatter coefficient-beta in the lower boundary layer. Values of beta-range over 5 orders of magnitude, are lognormally distributed for any given location, and show geographical patterns which depend on wind speed and relative humidity. The results indicate that sufficient particles are found in the boundary layer over all areas of the North Atlantic to permit retrieval of the wind profile in this layer with a satellite wind sounder such as that proposed by the Laser Atmosphere Wind Sounder (LAWS). The retrieval rate depends in part on the molecular absorption in the atmosphere of the sounder's laser beam. For a CO2 laser wavelength of 9.11-mu-m the threshold value of beta required by the sounder is exceeded more than 95% of the time; for 10.59-mu-m it is exceeded a minimum of 70% of the time in the tropics. RP USN, RES LAB, WASHINGTON, DC 20375 USA. NR 24 TC 9 Z9 9 U1 0 U2 0 PU AMER GEOPHYSICAL UNION PI WASHINGTON PA 2000 FLORIDA AVE NW, WASHINGTON, DC 20009 USA SN 2169-897X EI 2169-8996 J9 J GEOPHYS RES-ATMOS JI J. Geophys. Res.-Atmos. PD MAR 20 PY 1991 VL 96 IS D3 BP 5307 EP 5314 DI 10.1029/89JD00693 PG 8 WC Meteorology & Atmospheric Sciences SC Meteorology & Atmospheric Sciences GA FD794 UT WOS:A1991FD79400029 ER PT J AU HOMER, LD NOVOTNY, JA AF HOMER, LD NOVOTNY, JA TI COMPUTER-SIMULATION OF INERT-GAS WASHOUT SO FASEB JOURNAL LA English DT Meeting Abstract C1 USN,MED RES INST,BETHESDA,MD 20889. NR 0 TC 1 Z9 1 U1 0 U2 0 PU FEDERATION AMER SOC EXP BIOL PI BETHESDA PA 9650 ROCKVILLE PIKE, BETHESDA, MD 20814-3998 SN 0892-6638 J9 FASEB J JI Faseb J. PD MAR 19 PY 1991 VL 5 IS 6 BP A1754 EP A1754 PN 3 PG 1 WC Biochemistry & Molecular Biology; Biology; Cell Biology SC Biochemistry & Molecular Biology; Life Sciences & Biomedicine - Other Topics; Cell Biology GA FE557 UT WOS:A1991FE55701730 ER PT J AU LIU, SY WILLIAMS, T KOMORIYA, A AF LIU, SY WILLIAMS, T KOMORIYA, A TI PURIFICATION AND CHARACTERIZATION OF SOLUBLE EGF RECEPTORS SECRETED FROM A431 CELLS SO FASEB JOURNAL LA English DT Meeting Abstract C1 US FDA,CBER,DIV CYTOKINE BIOL,BETHESDA,MD 20014. USN,MED RES INST,BETHESDA,MD 20814. NR 0 TC 0 Z9 0 U1 0 U2 0 PU FEDERATION AMER SOC EXP BIOL PI BETHESDA PA 9650 ROCKVILLE PIKE, BETHESDA, MD 20814-3998 SN 0892-6638 J9 FASEB J JI Faseb J. PD MAR 19 PY 1991 VL 5 IS 6 BP A1622 EP A1622 PN 3 PG 1 WC Biochemistry & Molecular Biology; Biology; Cell Biology SC Biochemistry & Molecular Biology; Life Sciences & Biomedicine - Other Topics; Cell Biology GA FE557 UT WOS:A1991FE55700963 ER PT J AU YAPA, RD ODYA, CE LEE, CH CARLIN, RJ SOLTANITEHRANI, B AF YAPA, RD ODYA, CE LEE, CH CARLIN, RJ SOLTANITEHRANI, B TI INTERACTIONS OF MOUSE MONOCLONAL ANTIIDIOTYPIC ANTIBODIES (MAB2) WITH MOUSE MONOCLONAL KININ ANTIBODIES (MAB1) SO FASEB JOURNAL LA English DT Meeting Abstract C1 INDIANA UNIV,SCH MED,MED SCI PROGRAM,BLOOMINGTON,IN 47405. USN,RES INST,BETHESDA,MD 20814. NR 1 TC 1 Z9 1 U1 1 U2 1 PU FEDERATION AMER SOC EXP BIOL PI BETHESDA PA 9650 ROCKVILLE PIKE, BETHESDA, MD 20814-3998 SN 0892-6638 J9 FASEB J JI Faseb J. PD MAR 19 PY 1991 VL 5 IS 6 BP A1577 EP A1577 PN 3 PG 1 WC Biochemistry & Molecular Biology; Biology; Cell Biology SC Biochemistry & Molecular Biology; Life Sciences & Biomedicine - Other Topics; Cell Biology GA FE557 UT WOS:A1991FE55700700 ER PT J AU LAU, YY CHERNIN, D COLOMBANT, DG HO, PT AF LAU, YY CHERNIN, D COLOMBANT, DG HO, PT TI QUANTUM EXTENSION OF CHILD-LANGMUIR LAW SO PHYSICAL REVIEW LETTERS LA English DT Article AB Using a simple mean-field model of the electron-electron interaction, we have studied the effect of space charge in a planar diode. Our results show, in particular, that the classical value for the limiting current in such a diode can be exceeded by a large factor due to the effect of tunneling. The smooth transition of the solutions from the quantum to the classical (nonquantum) regime is demonstrated. C1 SCI APPLICAT INT CORP,MCLEAN,VA 22102. UNIV MARYLAND,DEPT ELECT ENGN,COLLEGE PK,MD 20742. RP LAU, YY (reprint author), USN,RES LAB,DIV PLASMA PHYS,BEAM PHYS BRANCH,WASHINGTON,DC 20375, USA. NR 8 TC 60 Z9 60 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 MAR 18 PY 1991 VL 66 IS 11 BP 1446 EP 1449 DI 10.1103/PhysRevLett.66.1446 PG 4 WC Physics, Multidisciplinary SC Physics GA FB937 UT WOS:A1991FB93700017 ER PT J AU SHULT, PA POLYAK, F DICK, EC WARSHAUER, DM KING, LA MANDEL, AD AF SHULT, PA POLYAK, F DICK, EC WARSHAUER, DM KING, LA MANDEL, AD TI ADENOVIRUS-21 INFECTION IN AN ISOLATED ANTARCTIC STATION - TRANSMISSION OF THE VIRUS AND SUSCEPTIBILITY OF THE POPULATION SO AMERICAN JOURNAL OF EPIDEMIOLOGY LA English DT Article DE ADENOVIRUSES; HUMAN; COLD CLIMATE; COMMON COLD; COMMUNICABLE DISEASES; RESPIRATORY TRACT INFECTIONS; SOCIAL ISOLATION ID RESPIRATORY-INFECTION; RHINOVIRUSES; COLDS AB Natural dissemination of viral respiratory illness to susceptible men may occur with surprising difficulty. This was especially evident during a 1977 outbreak of adenovirus type 21 (Ad-21) at McMurdo Station, a US research base in Antarctica. The unique circumstances at McMurdo allowed 125 men from the US to join and intermingle with 75 men who had wintered for 6 months in complete isolation. For an additional 5-week (September 2 to October 4, 1977) isolation period, respiratory illness etiology and transmission were monitored in the combined population. A total of 89% of the population was susceptible (neutralizing antibody titer, < 1:3) to Ad-21 but only 15.0% were infected. Illness spread very slowly (1.5 cases/100 persons/week) with no epidemic peak and was much less severe than Ad-21 outbreaks in other settings. The incidence of infection (17.3%) and illness (9.6%) was low even in men who had wintered over, with values very similar to those of the newcomers (13.9% and 8.9%, respectively). Thus, despite a harsh environment and frequent prolonged gatherings of susceptible personnel, even a respiratory virus type with known epidemic potential was surprisingly difficult to transmit. C1 USN SUPPORT FORCE ANTARCTICA,PORT HUENEMEL,CA. NATL AERONAUT & SPACE CTR,AMES RES CTR,MOFFETT FIELD,CA. UNIV WISCONSIN,SCH MED,DEPT PREVENT MED,MADISON,WI 53706. NR 33 TC 9 Z9 9 U1 0 U2 3 PU AMER J EPIDEMIOLOGY PI BALTIMORE PA 624 N BROADWAY RM 225, BALTIMORE, MD 21205 SN 0002-9262 J9 AM J EPIDEMIOL JI Am. J. Epidemiol. PD MAR 15 PY 1991 VL 133 IS 6 BP 599 EP 607 PG 9 WC Public, Environmental & Occupational Health SC Public, Environmental & Occupational Health GA FD790 UT WOS:A1991FD79000010 PM 2006647 ER PT J AU BRENNAN, J OCONNOR, T MAKUCH, RW SIMMONS, AM RUSSELL, E LINNOILA, RI PHELPS, RM GAZDAR, AF IHDE, DC JOHNSON, BE AF BRENNAN, J OCONNOR, T MAKUCH, RW SIMMONS, AM RUSSELL, E LINNOILA, RI PHELPS, RM GAZDAR, AF IHDE, DC JOHNSON, BE TI MYC FAMILY DNA AMPLIFICATION IN 107 TUMORS AND TUMOR-CELL LINES FROM PATIENTS WITH SMALL-CELL LUNG-CANCER TREATED WITH DIFFERENT COMBINATION CHEMOTHERAPY REGIMENS SO CANCER RESEARCH LA English DT Article ID C-MYC; GENE AMPLIFICATION; N-MYC; BRONCHOGENIC-CARCINOMA; EXPRESSION; ONCOGENE; PROTOONCOGENES; RADIATION; THERAPY AB We studied 107 specimens (38 tumors and 69 tumor cell lines) from 90 patients with small cell lung cancer to determine the characteristics and clinical situations of patients from whom tumor cell lines could be established and the myc family DNA copy number. The proportion of extensive stage small cell lung cancer patients from whom a tumor cell line could be established prior too the initiation of theraphy increased during the 10 years of the study (P < 0.001). Amplification of one of the myc family genes occurred in 3 of 40 (8%) of the untreated patient specimens compared to 19 of 67 (28%) of the treated patient specimens (P = 0.01). The myc family DNA amplification occurred in 17 of 54 (31%) of the specimens from patients treated with cyclophosphamide-based combinations and 2 of 13 (15%) of the specimens from patients treated with etoposide/cisplatin (P = 0.25). Both tumors and tumor cell lines were obtained from 17 patients with small cell lung cancer and the myc family DNA copy number was similar in 16 of the 17 patients. We conclude that: (a) myc family DNA amplification occurs more commonly in specimens from treated than untreated patients; (b) there are no prominent differences in the frequency of amplification following treatment with different chemotherapy regimens; and (c) myc family DNA amplification is similar in tumors and tumor cell lines from the same patients. C1 USN,NCI,NATL NAVAL MED CTR,NAVY MED ONCOL BRANCH,BLDG 8,ROOM 5101,BETHESDA,MD 20889. UNIFORMED SERV UNIV HLTH SCI,BETHESDA,MD 20899. YALE UNIV,DIV BIOSTAT,NEW HAVEN,CT 06510. NR 24 TC 91 Z9 94 U1 1 U2 2 PU AMER ASSOC CANCER RESEARCH PI PHILADELPHIA PA PUBLIC LEDGER BLDG, SUITE 816, 150 S. INDEPENDENCE MALL W., PHILADELPHIA, PA 19106 SN 0008-5472 J9 CANCER RES JI Cancer Res. PD MAR 15 PY 1991 VL 51 IS 6 BP 1708 EP 1712 PG 5 WC Oncology SC Oncology GA FB576 UT WOS:A1991FB57600022 PM 1847842 ER PT J AU MCMORROW, D LOTSHAW, WT AF MCMORROW, D LOTSHAW, WT TI DEPHASING AND RELAXATION IN COHERENTLY EXCITED ENSEMBLES OF INTERMOLECULAR OSCILLATORS SO CHEMICAL PHYSICS LETTERS LA English DT Article ID IMPULSIVE STIMULATED SCATTERING; MOLECULAR VIBRATIONAL MOTION; OPTICAL KERR; LIGHT-SCATTERING; RAYLEIGH-SCATTERING; RAMAN BANDS; LIQUID CS2; DYNAMICS; SIMULATION; SPECTRA AB The multi-component, subpicosecond dynamics observed in femtosecond nonlinear-optical experiments on transparent liquids are described in terms of a physically intuitive model based on intermolecular vibrational motion. The essential feature of this model is the recognition that underdamped, critically damped, and overdamped motions can all contribute to the dynamics (or lineshape) associated with a single, inhomogeneously broadened, intermolecular vibrational degree of freedom. This unique result arises because dynamic dephasing processes in liquids occur on a time scale comparable to that of the vibrational motions themselves. These considerations are applied to the subpicosecond optical Kerr dynamics of CS2 liquid. C1 GE,RES & DEV,SCHENECTADY,NY 12301. RP MCMORROW, D (reprint author), USN,RES LAB,CODE 4613,WASHINGTON,DC 20375, USA. NR 41 TC 80 Z9 80 U1 0 U2 3 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0009-2614 J9 CHEM PHYS LETT JI Chem. Phys. Lett. PD MAR 15 PY 1991 VL 178 IS 1 BP 69 EP 74 DI 10.1016/0009-2614(91)85055-2 PG 6 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA FB896 UT WOS:A1991FB89600012 ER PT J AU BAGAR, S PACHECO, ND ROLLWAGEN, FM AF BAGAR, S PACHECO, ND ROLLWAGEN, FM TI EFFECTS OF CYTOKINES ON CAMPYLOBACTER-JEJUNI INFECTION AND IMMUNITY IN MICE SO FASEB JOURNAL LA English DT Meeting Abstract C1 USN,MED RES INST,BETHESDA,MD 20814. GEOCENTERS INC,BETHESDA,MD 20889. NR 0 TC 0 Z9 0 U1 0 U2 0 PU FEDERATION AMER SOC EXP BIOL PI BETHESDA PA 9650 ROCKVILLE PIKE, BETHESDA, MD 20814-3998 SN 0892-6638 J9 FASEB J JI Faseb J. PD MAR 15 PY 1991 VL 5 IS 5 BP A1366 EP A1366 PN 2 PG 1 WC Biochemistry & Molecular Biology; Biology; Cell Biology SC Biochemistry & Molecular Biology; Life Sciences & Biomedicine - Other Topics; Cell Biology GA FC550 UT WOS:A1991FC55002600 ER PT J AU CLARKE, JR TAYLOR, NAS BAL, GK AF CLARKE, JR TAYLOR, NAS BAL, GK TI REACTIVE POWER IN THE ASSESSMENT OF ELASTIC RESPIRATORY LOADS SO FASEB JOURNAL LA English DT Meeting Abstract C1 USN,MED RES INST,BETHESDA,MD 20814. RI Taylor, Nigel/A-1975-2014 NR 0 TC 0 Z9 0 U1 0 U2 0 PU FEDERATION AMER SOC EXP BIOL PI BETHESDA PA 9650 ROCKVILLE PIKE, BETHESDA, MD 20814-3998 SN 0892-6638 J9 FASEB J JI Faseb J. PD MAR 15 PY 1991 VL 5 IS 5 BP A1134 EP A1134 PN 2 PG 1 WC Biochemistry & Molecular Biology; Biology; Cell Biology SC Biochemistry & Molecular Biology; Life Sciences & Biomedicine - Other Topics; Cell Biology GA FC550 UT WOS:A1991FC55001256 ER PT J AU KENNEDY, ICS JUNE, C OSHEA, JJ AF KENNEDY, ICS JUNE, C OSHEA, JJ TI EPIDERMAL GROWTH-FACTOR RECEPTOR DEPENDENT ZETA-CHAIN TYROSINE PHOSPHORYLATION IN A MURINE T-CELL HYBRIDOMA EXPRESSING THIS RECEPTOR SO FASEB JOURNAL LA English DT Meeting Abstract C1 NCI,FCRDC,BRMP,FREDERICK,MD 21702. USN,MED BRANCH,BETHESDA,MD 20892. USN,MED RES INST,BETHESDA,MD 20892. NR 0 TC 0 Z9 0 U1 0 U2 0 PU FEDERATION AMER SOC EXP BIOL PI BETHESDA PA 9650 ROCKVILLE PIKE, BETHESDA, MD 20814-3998 SN 0892-6638 J9 FASEB J JI Faseb J. PD MAR 15 PY 1991 VL 5 IS 5 BP A992 EP A992 PN 2 PG 1 WC Biochemistry & Molecular Biology; Biology; Cell Biology SC Biochemistry & Molecular Biology; Life Sciences & Biomedicine - Other Topics; Cell Biology GA FC550 UT WOS:A1991FC55000441 ER PT J AU MALIK, A EGAN, JE HOFFMAN, SL AF MALIK, A EGAN, JE HOFFMAN, SL TI CYTOTOXIC LYMPHOCYTE-T AGAINST THE PLASMODIUM-FALCIPARUM CIRCUMSPOROZOITE PROTEIN SO FASEB JOURNAL LA English DT Meeting Abstract C1 USN,MED RES INST,BETHESDA,MD 20814. WALTER REED ARMY MED CTR,WASHINGTON,DC 20307. NR 0 TC 0 Z9 0 U1 0 U2 0 PU FEDERATION AMER SOC EXP BIOL PI BETHESDA PA 9650 ROCKVILLE PIKE, BETHESDA, MD 20814-3998 SN 0892-6638 J9 FASEB J JI Faseb J. PD MAR 15 PY 1991 VL 5 IS 5 BP A1376 EP A1376 PN 2 PG 1 WC Biochemistry & Molecular Biology; Biology; Cell Biology SC Biochemistry & Molecular Biology; Life Sciences & Biomedicine - Other Topics; Cell Biology GA FC550 UT WOS:A1991FC55002658 ER PT J AU SOPCHICK, T TRONE, D LABRANCH, E BOOTH, R HUNT, P KAUFMANN, W POZOS, RS AF SOPCHICK, T TRONE, D LABRANCH, E BOOTH, R HUNT, P KAUFMANN, W POZOS, RS TI ESOPHAGEAL, RECTAL AND TYMPANIC TEMPERATURE RESPONSES DURING EXERCISE AND HEAT STRESSED CONDITIONS SO FASEB JOURNAL LA English DT Meeting Abstract C1 USN,HLTH RES CTR,SAN DIEGO,CA 92132. NR 0 TC 0 Z9 0 U1 0 U2 0 PU FEDERATION AMER SOC EXP BIOL PI BETHESDA PA 9650 ROCKVILLE PIKE, BETHESDA, MD 20814-3998 SN 0892-6638 J9 FASEB J JI Faseb J. PD MAR 15 PY 1991 VL 5 IS 5 BP A1400 EP A1400 PN 2 PG 1 WC Biochemistry & Molecular Biology; Biology; Cell Biology SC Biochemistry & Molecular Biology; Life Sciences & Biomedicine - Other Topics; Cell Biology GA FC550 UT WOS:A1991FC55002803 ER PT J AU TAYLOR, NAS CLARKE, JR AF TAYLOR, NAS CLARKE, JR TI RESPIRATORY CONTROL DURING COMPRESSION TO AND DECOMPRESSION FROM 31.3 ATMOSPHERES ABSOLUTE SO FASEB JOURNAL LA English DT Meeting Abstract C1 USN,MED RES INST,BETHESDA,MD 20889. RI Taylor, Nigel/A-1975-2014 NR 0 TC 0 Z9 0 U1 0 U2 0 PU FEDERATION AMER SOC EXP BIOL PI BETHESDA PA 9650 ROCKVILLE PIKE, BETHESDA, MD 20814-3998 SN 0892-6638 J9 FASEB J JI Faseb J. PD MAR 15 PY 1991 VL 5 IS 5 BP A1125 EP A1125 PN 2 PG 1 WC Biochemistry & Molecular Biology; Biology; Cell Biology SC Biochemistry & Molecular Biology; Life Sciences & Biomedicine - Other Topics; Cell Biology GA FC550 UT WOS:A1991FC55001201 ER PT J AU VANDENBERGHE, P FLETCHER, MC TURKA, LA THOMPSON, CB JUNE, CH AF VANDENBERGHE, P FLETCHER, MC TURKA, LA THOMPSON, CB JUNE, CH TI ANTI-CD28 MAB 9.3 INDUCES TYROSINE PHOSPHORYLATION IN HUMAN T-CELLS SO FASEB JOURNAL LA English DT Meeting Abstract C1 USN,MED RES INST,BETHESDA,MD 20889. UNIV MICHIGAN,ANN ARBOR,MI 48109. NR 0 TC 0 Z9 0 U1 0 U2 0 PU FEDERATION AMER SOC EXP BIOL PI BETHESDA PA 9650 ROCKVILLE PIKE, BETHESDA, MD 20814-3998 SN 0892-6638 J9 FASEB J JI Faseb J. PD MAR 15 PY 1991 VL 5 IS 5 BP A991 EP A991 PN 2 PG 1 WC Biochemistry & Molecular Biology; Biology; Cell Biology SC Biochemistry & Molecular Biology; Life Sciences & Biomedicine - Other Topics; Cell Biology GA FC550 UT WOS:A1991FC55000434 ER PT J AU WEINBERG, RP HYDE, D STEVENS, DM DOUBT, TJ AF WEINBERG, RP HYDE, D STEVENS, DM DOUBT, TJ TI PYRIDOSTIGMINE INGESTION AND THERMAL BALANCE DURING EXERCISE IN WARM WATER SO FASEB JOURNAL LA English DT Meeting Abstract C1 USN,MED RES INST,DEPT DIVING MED,BETHESDA,MD 20814. NR 0 TC 0 Z9 0 U1 0 U2 0 PU FEDERATION AMER SOC EXP BIOL PI BETHESDA PA 9650 ROCKVILLE PIKE, BETHESDA, MD 20814-3998 SN 0892-6638 J9 FASEB J JI Faseb J. PD MAR 15 PY 1991 VL 5 IS 5 BP A1400 EP A1400 PN 2 PG 1 WC Biochemistry & Molecular Biology; Biology; Cell Biology SC Biochemistry & Molecular Biology; Life Sciences & Biomedicine - Other Topics; Cell Biology GA FC550 UT WOS:A1991FC55002799 ER PT J AU CHOPLIN, NT MONROE, JF AF CHOPLIN, NT MONROE, JF TI SURGICALLY INDUCED ASTIGMATISM IN COMBINED EXTRACAPSULAR CATARACT-EXTRACTION WITH FILTERING PROCEDURES COMPARED TO EXTRACAPSULAR CATARACT-EXTRACTION ALONE - A CASE-CONTROL STUDY SO INVESTIGATIVE OPHTHALMOLOGY & VISUAL SCIENCE LA English DT Meeting Abstract C1 USN HOSP,DEPT OPHTHALMOL,SAN DIEGO,CA 92134. NR 0 TC 0 Z9 0 U1 0 U2 0 PU LIPPINCOTT-RAVEN PUBL PI PHILADELPHIA PA 227 EAST WASHINGTON SQ, PHILADELPHIA, PA 19106 SN 0146-0404 J9 INVEST OPHTH VIS SCI JI Invest. Ophthalmol. Vis. Sci. PD MAR 15 PY 1991 VL 32 IS 4 BP 795 EP 795 PG 1 WC Ophthalmology SC Ophthalmology GA FC762 UT WOS:A1991FC76200626 ER PT J AU DAUM, KM CORLISS, DA MONACO, WA WAGENKNECHT, L MCGEE, JJ AF DAUM, KM CORLISS, DA MONACO, WA WAGENKNECHT, L MCGEE, JJ TI OCULAR TRACKING OF CARRIER-BASED PILOTS SO INVESTIGATIVE OPHTHALMOLOGY & VISUAL SCIENCE LA English DT Meeting Abstract C1 ST VINCENTS MED CTR,JACKSONVILLE,FL. USN HOSP,PORTSMOUTH,VA. UNIV ALABAMA,SCH OPTOMETRY,BIRMINGHAM,AL 35294. UNIV ALABAMA,SCH PUBL HLTH,BIRMINGHAM,AL 35294. NR 0 TC 0 Z9 0 U1 0 U2 0 PU LIPPINCOTT-RAVEN PUBL PI PHILADELPHIA PA 227 EAST WASHINGTON SQ, PHILADELPHIA, PA 19106 SN 0146-0404 J9 INVEST OPHTH VIS SCI JI Invest. Ophthalmol. Vis. Sci. PD MAR 15 PY 1991 VL 32 IS 4 BP 897 EP 897 PG 1 WC Ophthalmology SC Ophthalmology GA FC762 UT WOS:A1991FC76201117 ER PT J AU HASTY, B HOLZINGER, K AF HASTY, B HOLZINGER, K TI HISTOLOGY AND PERFUSION-FLOW STUDIES OF HEPARINIZED VS STANDARD PEDIATRIC MOLTENO IMPLANTS SO INVESTIGATIVE OPHTHALMOLOGY & VISUAL SCIENCE LA English DT Meeting Abstract C1 USN HOSP,SAN DIEGO,CA 92134. NR 0 TC 0 Z9 0 U1 0 U2 0 PU LIPPINCOTT-RAVEN PUBL PI PHILADELPHIA PA 227 EAST WASHINGTON SQ, PHILADELPHIA, PA 19106 SN 0146-0404 J9 INVEST OPHTH VIS SCI JI Invest. Ophthalmol. Vis. Sci. PD MAR 15 PY 1991 VL 32 IS 4 BP 1123 EP 1123 PG 1 WC Ophthalmology SC Ophthalmology GA FC762 UT WOS:A1991FC76202226 ER PT J AU FERRANTE, RF AF FERRANTE, RF TI VIBRATIONAL FREQUENCIES IN THE A 3E STATE OF METHYLNITRENE SO JOURNAL OF CHEMICAL PHYSICS LA English DT Note ID SPECTROSCOPY RP FERRANTE, RF (reprint author), USN ACAD,DEPT CHEM,ANNAPOLIS,MD 21402, USA. NR 13 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 0021-9606 J9 J CHEM PHYS JI J. Chem. Phys. PD MAR 15 PY 1991 VL 94 IS 6 BP 4678 EP 4679 DI 10.1063/1.460600 PG 2 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA FD735 UT WOS:A1991FD73500066 ER PT J AU FLEMING, GH SEMTNER, AJ AF FLEMING, GH SEMTNER, AJ TI A NUMERICAL STUDY OF INTERANNUAL OCEAN FORCING ON ARCTIC ICE SO JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS LA English DT Article ID SEA ICE; MODEL; FLUCTUATIONS; CIRCULATION; SIMULATION AB A fully prognostic coupled ice-ocean model is used to examine the importance of interannually variable ocean forcing, on large-scale monthly simulations of the Arctic ice cover. The model is forced by a prescribed interannually variable atmosphere. Simulations are conducted for a 120-month period and validated with observed ice concentration data. The model produces very reasonable simulations of the ice edge position, particularly in the Barents and Greenland seas. The use of interannual ocean forcing produces major improvements to the simulation of the ice concentration for both the annual cycle and interannual variations, as compared with simulations in which the ocean forcing is a prescribed mean annual cycle. Vertical ocean heat flux appears to be the dominant mechanism controlling localized ice area anomalies and the overall ice concentration. Consistent errors in simulated ice concentration and thickness remain, including a slightly exaggerated melt-freeze cycle and insufficient ice thickness. The lack of a nonprognostic mixed layer and the coarse vertical resolution are apparently inadequate to represent the vertical mixing, stratification, and diffusion processes properly. C1 USN,POSTRAD SCH,DEPT OCEANOG,MONTEREY,CA 93943. NR 18 TC 21 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 MAR 15 PY 1991 VL 96 IS C3 BP 4589 EP 4603 DI 10.1029/90JC02268 PG 15 WC Oceanography SC Oceanography GA FC252 UT WOS:A1991FC25200006 ER PT J AU PIACSEK, S ALLARD, R WARNVARNAS, A AF PIACSEK, S ALLARD, R WARNVARNAS, A TI STUDIES OF THE ARCTIC ICE COVER AND UPPER OCEAN WITH A COUPLED ICE-OCEAN MODEL SO JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS LA English DT Article ID SEA-ICE; MIXED LAYER; CIRCULATION; SIMULATION AB An ice-ocean model has been developed by coupling the Hibler ice model to a three-dimensional ocean model that consists of a turbulent mixed layer model and an inverse geostrophic model. The coupled model has a horizontal grid spacing of 127 km and has 17 vertical levels extending to the ocean bottom. The model is forced with 12-hourly general circulation model-derived atmospheric fluxes for the year 1986, for which good quality ice edge analyses and buoy tracks were available for comparisons. The results are presented for the fifth year of a repetitive simulation with the 1986 fluxes, at which time the system has reached a statistical equilibrium. The seasonal and geographical variations of the ice cover and the upper few hundred meters of the ocean have been examined, including the heat and salt budgets. The computed heat fluxes and mixed layer depths (MLDs) fall in the observed seasonal ranges, with winter heat fluxes ranging from 15 W m-2 in the central Arctic to about 500 W m-2 in the Barents Sea area, and summer fluxes from about 5 W m-2 under the ice to about 30 W m-2 in the various marginal ice zone (MIZ) edge areas. The corresponding winter MLDs are found to be about 25-75 m in the central Arctic to a deep 800 m in the Greenland Sea; typical summer MLDs are between 5 and 30 m. In all seasons, the MIZ was found to be the center of flux activity for both heat and salt, with the processes of advection, diffusion, atmospheric forcing, and vertical oceanic fluxes having their largest values here, and of comparable magnitudes. Values of the heat flux components in the MIZ exceed those found under the ice by an order of magnitude or more, and those in the open water region by a factor of 2. For salt, the situation is similar except in the summer (June through September), when a lot of salt flux activity takes place under the ice. Comparisons are made with Naval Polar Oceanography Center (NPOC) analyses for ice concentration and ice edge, and with observed Arctic buoy tracks, in the same 1986 time period. The computed ice edge positions have comparable accuracy to previous three-dimensional coupled ice-ocean studies, with too much ice growth during the winter in the Barents Sea and too little ice east of Greenland. The ice thickness distributions, however, are much better, with a monotonic increase of the ice thickness from the Siberian coast east toward the Canadian archipelago with maximum winter values of about 5-6 m. C1 BERKELEY RES ASSOCIATES INC,SPRINGFIELD,VA 22151. SACLANT RES CTR,I-19026 LA SPEZIA,ITALY. RP PIACSEK, S (reprint author), USN OCEANOG & ATMOSPHER RES LAB,STENNIS SPACE CTR,MS 39529, USA. NR 37 TC 15 Z9 15 U1 1 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 MAR 15 PY 1991 VL 96 IS C3 BP 4631 EP 4650 DI 10.1029/90JC02265 PG 20 WC Oceanography SC Oceanography GA FC252 UT WOS:A1991FC25200009 ER PT J AU OVERLAND, JE GUEST, PS AF OVERLAND, JE GUEST, PS TI THE ARCTIC SNOW AND AIR-TEMPERATURE BUDGET OVER SEA ICE DURING WINTER SO JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS LA English DT Article ID BOUNDARY-LAYER; MODEL AB Arctic cooling through the fall-winter transition is calculated from a coupled atmosphere-sea ice thermal model and compared to temperature soundings and surface measurements made north of Svalbard during the Coordinated Eastern Arctic Experiment (CEAREX). A typical winter, clear-sky vertical temperature structure of the polar air mass is composed of a surface-based temperature inversion or an inversion above a very shallow (30-180 m) mechanically mixed boundary layer with temperatures -30-degrees to -35-degrees-C, a broad temperature maximum layer of -20-degrees to -25-degrees-C between 0.5 and 2 km, and a negative lapse rate aloft. Because the emissivity of the temperature maximum layer is less than that of the snow surface, radiative equilibrium maintains this low level temperature inversion structure. A 90-day simulation shows that heat flux through the ice is insufficient to maintain a local thermal equilibrium. Northward temperature advection by transient storms is required to balance outward longwave radiation to space. Leads and thin ice (< 0.8 m) contribute 12% to the winter tropospheric heat balance in the central Arctic. CEAREX temperature soundings and longwave radiation data taken near 81-degrees-N show polar air mass characteristics by early November, but numerous storms interrupted this air mass during December. Snow temperature changes of 15-degrees-C occurred in response to changes in downward atmospheric longwave radiation of 90 W m-2 between cloud and clear sky. We propose that the strength of boundary layer stability, and thus the degree of air-ice momentum coupling, is driven by the magnitude of the radiation deficit (downward-outward longwave) at the surface and the potential temperature of the temperature maximum layer. This concept is of potential benefit in prescribing atmospheric forcing for sea ice models because a surface air temperature-snow temperature difference field is difficult to obtain and it may be possible to obtain a radiation deficit field via satellite sensors. C1 USN,POSTGRAD SCH,MONTEREY,CA 93943. RP OVERLAND, JE (reprint author), NOAA,PACIFIC MARINE ENVIRONM LAB,7600 SAND POINT WAYNE,SEATTLE,WA 98115, USA. NR 21 TC 73 Z9 73 U1 3 U2 7 PU AMER GEOPHYSICAL UNION PI WASHINGTON PA 2000 FLORIDA AVE NW, WASHINGTON, DC 20009 SN 0148-0227 J9 J GEOPHYS RES-OCEANS JI J. Geophys. Res.-Oceans PD MAR 15 PY 1991 VL 96 IS C3 BP 4651 EP 4662 DI 10.1029/90JC02264 PG 12 WC Oceanography SC Oceanography GA FC252 UT WOS:A1991FC25200010 ER PT J AU SMITH, DC BIRD, AA AF SMITH, DC BIRD, AA TI THE INTERACTION OF AN OCEAN EDDY WITH AN ICE EDGE OCEAN JET IN A MARGINAL ICE-ZONE SO JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS LA English DT Article ID TOPOGRAPHY; EVOLUTION; VORTEX; MODEL; FLOW; GULF AB Remotely sensed images in the East Greenland Current marginal ice zone region indicate a variety of mesoscale motions. These range from isolated monopoles and dipoles to multiple eddy fields. Recent observations indicate that many of the eddies may be advected into the region from the West Spitsbergen Current region. They then interact with the East Greenland Current marginal ice zone and its associated along-ice-edge jet. In this paper we illustrate how the ice floe fields can evolve during the interaction of an ocean eddy with an along-ice-edge ocean jet. The effects of eddy sense of rotation, flow strength, and bottom topography are considered in barotropic and baroclinic, two-layer numerical experiments. Initially, barotropic experiments involve the combined effects of flat-bottom eddy-jet interactions and eddy-topography interactions. Over a flat bottom, anticyclones interact with the cyclonically sheared side of the jet and move seaward, exporting ice away from the ice edge in a dipolar distribution. Cyclones move toward the jet and are advected downstream. A second dipole formation mechanism is associated with eddy-topography interaction and is a consequence of the shallow pycnocline depth of the region. Rapid topographic Rossby wave radiation in the lower layer spreads energy along slope and upslope (downslope) for cyclones (anticyclones). The upper ocean response to this process is a dipole which propagates parallel to the ice edge with shallow water to the left (topographic eastward). Jet-induced and topography-induced eddy propagation tendencies combine to enhance cyclone-jet interaction and limit anticyclone-jet interactions. The dipole formation associated with eddy-topography interaction is weakened by the presence of the jet but not eliminated. Eddy-induced distortions in the ice edge are suppressed by the stabilizing effect of topography on the jet. Sensitivity of the initially barotropic results to variation in the Rossby number and degree of topographic slope illustrates that eddies are more efficient in producing ice edge distortions for stronger flows and weaker topographic slopes. For initially baroclinic simulations over topography, results are comparable to flat-bottom cases. Strong upper layer eddy-jet interactions can occur independent of topographic effects which are constrained to the lower layer. RP USN, POSTGRAD SCH, DEPT OCEANOG, MONTEREY, CA 93943 USA. NR 28 TC 9 Z9 9 U1 0 U2 1 PU AMER GEOPHYSICAL UNION PI WASHINGTON PA 2000 FLORIDA AVE NW, WASHINGTON, DC 20009 USA SN 2169-9275 EI 2169-9291 J9 J GEOPHYS RES-OCEANS JI J. Geophys. Res.-Oceans PD MAR 15 PY 1991 VL 96 IS C3 BP 4675 EP 4689 DI 10.1029/90JC02262 PG 15 WC Oceanography SC Oceanography GA FC252 UT WOS:A1991FC25200012 ER PT J AU SHAW, WJ PAULEY, RL GOBEL, TM RADKE, LF AF SHAW, WJ PAULEY, RL GOBEL, TM RADKE, LF TI A CASE-STUDY OF ATMOSPHERIC BOUNDARY-LAYER MEAN STRUCTURE FOR FLOW PARALLEL TO THE ICE EDGE - AIRCRAFT OBSERVATIONS FROM CEAREX SO JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS LA English DT Article ID MESOSCALE VARIATIONS; ZONE; MODEL; SEA AB This paper describes a case study of the mean structure of the atmospheric boundary layer (ABL) in the marginal ice zone of the Barents Sea for flow nearly parallel to the ice edge. Data were collected by the NOAA P-3 Orion research aircraft on March 24, 1989. The geostrophic wind above the boundary layer was oriented approximately 15-degrees off-ice with a speed of 12 m s-1, and the atmosphere above the ABL showed little cross-ice-edge variability. A lidar on the aircraft revealed (over the water) the downward slope of a stratocumulus deck toward the ice edge. The associated inversion continued to slope downward over the ice, creating large thermal wind effects within the boundary layer. The inversion slope, combined with horizontal boundary layer temperature gradients, produced a factor-of-2 decrease in surface geostrophic wind from water to ice. Below the inversion the data revealed an ABL that remained well mixed for 100 km into the ice. A gust probe system on the aircraft provided a mapping of low-level fluxes from a 200-km leg perpendicular to the ice edge. C1 USN,POSTGRAD SCH,DEPT METEOROL,MONTEREY,CA 93943. UNIV WASHINGTON,DEPT ATMOSPHER SCI,AK-40,SEATTLE,WA 98195. NR 17 TC 7 Z9 7 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 MAR 15 PY 1991 VL 96 IS C3 BP 4691 EP 4708 DI 10.1029/90JC01953 PG 18 WC Oceanography SC Oceanography GA FC252 UT WOS:A1991FC25200013 ER PT J AU GUEST, PS DAVIDSON, KL AF GUEST, PS DAVIDSON, KL TI THE AERODYNAMIC ROUGHNESS OF DIFFERENT TYPES OF SEA ICE SO JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS LA English DT Article ID WIND STRESS MEASUREMENTS; DRAG COEFFICIENT; ZONE EXPERIMENT; SURFACE STRESS; OCEAN; FLUX AB The aerodynamic roughness for all major types of sea ice is specified on the basis of surface layer measurements from ship and ice floe platforms. Median neutral surface drag coefficients, C(dn) x 1000, for grease and nilas ice are 0.7 and 1.6. Small, medium, large, and fused pancake ice have C(dn) equal to 0.9, 1.6, 2.4, and 1.9. Young ice C(dn) ranges from 2.3 to 3.1. Very smooth first-year or multiyear ice with no pressure ridges has C(dn) equal to 1.5. Pack ice has median values of 2.0 and 2.2 for first-year and multiyear ice. Marginal ice zone ice averages 3.1 and 3.4 (first-year, multiyear) if unaffected by wave action. Wave-affected ice has C(dn) values of 4.2 and 4.6 (first-year, multiyear). Extremely rough multiyear ice in intense shear or compaction regions has C(dn) equal to 8.0. Open ocean areas within 100 km of an ice edge averaged 1.8, while ice-free water downwind of ice, with small or no waves is 1.4. These values can be adjusted if heat fluxes are present. The accuracy of the C(dn) averages is estimated to be 20% or better. RP USN, POSTGRAD SCH, DEPT METEOROL, CODE MR, MONTEREY, CA 93943 USA. NR 20 TC 68 Z9 73 U1 0 U2 0 PU AMER GEOPHYSICAL UNION PI WASHINGTON PA 2000 FLORIDA AVE NW, WASHINGTON, DC 20009 USA SN 2169-9275 EI 2169-9291 J9 J GEOPHYS RES-OCEANS JI J. Geophys. Res.-Oceans PD MAR 15 PY 1991 VL 96 IS C3 BP 4709 EP 4721 DI 10.1029/90JC02261 PG 13 WC Oceanography SC Oceanography GA FC252 UT WOS:A1991FC25200014 ER PT J AU MELVILLE, WK STEWART, RH KELLER, WC KONG, JA ARNOLD, DV JESSUP, AT LOEWEN, MR SLINN, AM AF MELVILLE, WK STEWART, RH KELLER, WC KONG, JA ARNOLD, DV JESSUP, AT LOEWEN, MR SLINN, AM TI MEASUREMENTS OF ELECTROMAGNETIC BIAS IN RADAR ALTIMETRY SO JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS LA English DT Article ID SEA-SURFACE; WIND-STRESS; OCEAN; COEFFICIENTS; REFLECTION; SPEED; ECHO; FLUX; MSL AB The accuracy of satellite altimetric measurements of sea level is limited in part by the influence of ocean waves on the altimeter signal reflected from the sea surface. The difference between the mean reflecting surface and mean sea level is the electromagnetic bias. The bias is poorly known, yet for such altimetric satellite missions as the Topography Experiment (TOPEX)/Poseidon it is the largest source of error exclusive of those resulting from calculation of the satellite's ephemeris. Previous observations of electromagnetic bias have had a large, apparently random scatter in the range of 1-5% of significant wave height; these observations are inconsistent with theoretical calculations of the bias. To obtain a better understanding of the bias, we have measured it directly using a 14-GHz scatterometer on the Chesapeake Bay Light Tower. We find that the bias is a quadratic function of significant wave height H 1/3. The normalized bias beta, defined as the bias divided by the significant wave height, is strongly correlated with wind speed at 10 m, U10, and much less strongly with significant wave height. The mean value for beta is -0.034, and the standard deviation of the variability about the mean is +/- 0.0097. The standard deviation of the variability after removing the influence of wind and waves is +/- 0.0051 = 0.51%. The results are based on data collected over a 24-day period during the Synthetic Aperture Radar and X-Band Ocean Nonlinearities (SAXON) experiment from September 19 to October 12, 1988. During the experiment, hourly averaged values of wind speed ranged from 0.2 to 15.3 m/s, significant wave height ranged from 0.3 to 2.9 m, and air minus sea temperature ranged from -10.2-degrees to 5.4-degrees-C. Because U10 can be calculated from the scattering cross section per unit area sigma-0 of the sea measured by spaceborne altimeters, we investigated the usefulness of sigma-0 for calculating bias. We find that beta is strongly correlated with sigma-0 and much less strongly with H 1/3. The standard deviation of the variability after removing the influence of the radio cross section and waves is +/- 0.0065 = 0.65%. The results indicate that electromagnetic bias in radar altimetry may be reduced to the level required by the TOPEX/Poseidon mission using only altimetric data. We find, furthermore, that the relationship between sigma-0 and wind speed agrees with previously published power law relationships within the accuracy of the measurement. The mean value of beta, its variability, and the sensitivity of beta to wind speed all agree well with previous measurements made using a 10-GHz radar carried on a low-flying aircraft. The mean value of beta, its variability, and the sensitivity to wind were all significantly larger than previous measurements made using a 39-GHz radar also carried on a low-flying aircraft. All experiments included a similar range of wind speeds and wave heights. The SAXON data were, however, much more extensive, and the statistical relationships correspondingly more significant. The mean value of beta is very close to the mean value determined from global measurements of sea level made by Geosat. C1 MIT,DEPT ELECT ENGN & COMP SCI,CAMBRIDGE,MA 02139. USN,RES LAB,WASHINGTON,DC 20375. TEXAS A&M UNIV SYST,DEPT OCEANOG,COLLEGE STN,TX 77843. RP MELVILLE, WK (reprint author), MIT,DEPT CIVIL ENGN,RALPH M PARSONS LAB,BLDG 48-331,CAMBRIDGE,MA 02139, USA. RI Loewen, Mark/E-5645-2013; Jessup, Andrew/E-5625-2017 NR 25 TC 30 Z9 30 U1 0 U2 3 PU AMER GEOPHYSICAL UNION PI WASHINGTON PA 2000 FLORIDA AVE NW, WASHINGTON, DC 20009 SN 0148-0227 J9 J GEOPHYS RES-OCEANS JI J. Geophys. Res.-Oceans PD MAR 15 PY 1991 VL 96 IS C3 BP 4915 EP 4924 DI 10.1029/90JC02114 PG 10 WC Oceanography SC Oceanography GA FC252 UT WOS:A1991FC25200030 ER PT J AU THOMPSON, DR GOTWOLS, BL KELLER, WC AF THOMPSON, DR GOTWOLS, BL KELLER, WC TI A COMPARISON OF KU-BAND DOPPLER MEASUREMENTS AT 20-DEGREES INCIDENCE WITH PREDICTIONS FROM A TIME-DEPENDENT SCATTERING MODEL SO JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS LA English DT Article ID WAVES; RADAR AB The analysis of coherent K(u)-band radar data measured from the Chesapeake Bay Light Tower as part of the SAXON Experiment in September-October 1988 is discussed. We concentrate on a 20-min data segment collected at an incidence angle of 20-degrees for both V-V and H-H polarization. Average Doppler spectra are estimated for each second of the data. These Dopper spectra show a large variation in center frequency and relative power due to the influence of the longwave surface on the backscattered field. The basic assumptions and approximations used in the formulation of a time-dependent scattering model are briefly presented, and concurrent measurements of the longwave surface spectrum at the tower are input into this model in order to calculate the expected mean Doppler spectra. These calculated spectra show very good agreement with the measurements. Implications of the measurements and calculations concerning future experiments and refinements to the model are also discussed. C1 USN,RES LAB,WASHINGTON,DC 20375. RP THOMPSON, DR (reprint author), JOHNS HOPKINS UNIV,APPL PHYS LAB,JOHNS HOPKINS RD,LAUREL,MD 20723, USA. NR 13 TC 24 Z9 24 U1 3 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 MAR 15 PY 1991 VL 96 IS C3 BP 4947 EP 4955 DI 10.1029/90JC02210 PG 9 WC Oceanography SC Oceanography GA FC252 UT WOS:A1991FC25200033 ER PT J AU DUTTA, I ALLEN, SM AF DUTTA, I ALLEN, SM TI A CALORIMETRIC STUDY OF PRECIPITATION IN COMMERCIAL ALUMINUM ALLOY-6061 SO JOURNAL OF MATERIALS SCIENCE LETTERS LA English DT Article ID ALLOYS; MECHANISM RP DUTTA, I (reprint author), USN,POSTGRAD SCH,DEPT MECH ENGN,MAT SCI GRP,MONTEREY,CA 93943, USA. NR 16 TC 242 Z9 246 U1 4 U2 34 PU CHAPMAN HALL LTD PI LONDON PA 2-6 BOUNDARY ROW, LONDON, ENGLAND SE1 8HN SN 0261-8028 J9 J MATER SCI LETT JI J. Mater. Sci. Lett. PD MAR 15 PY 1991 VL 10 IS 6 BP 323 EP 326 DI 10.1007/BF00719697 PG 4 WC Materials Science, Multidisciplinary SC Materials Science GA FD589 UT WOS:A1991FD58900007 ER PT J AU GROSS, F OSGOOD, CF AF GROSS, F OSGOOD, CF TI AN EXTENSION OF A THEOREM OF STEINMETZ SO JOURNAL OF MATHEMATICAL ANALYSIS AND APPLICATIONS LA English DT Article C1 USN,RES LAB,WASHINGTON,DC 20375. RP GROSS, F (reprint author), UNIV MARYLAND,DEPT MATH,BALTIMORE CTY CAMPUS,CATONSVILLE,MD 21228, USA. NR 2 TC 2 Z9 2 U1 0 U2 0 PU ACADEMIC PRESS INC JNL-COMP SUBSCRIPTIONS PI SAN DIEGO PA 525 B ST, STE 1900, SAN DIEGO, CA 92101-4495 SN 0022-247X J9 J MATH ANAL APPL JI J. Math. Anal. Appl. PD MAR 15 PY 1991 VL 156 IS 1 BP 287 EP 292 DI 10.1016/0022-247X(91)90397-I PG 6 WC Mathematics, Applied; Mathematics SC Mathematics GA FK216 UT WOS:A1991FK21600020 ER PT J AU BURNS, WK MOELLER, RP BULMER, CH GREENBLATT, AS AF BURNS, WK MOELLER, RP BULMER, CH GREENBLATT, AS TI DEPOLARIZED SOURCE FOR FIBEROPTIC APPLICATIONS SO OPTICS LETTERS LA English DT Article AB Two diode-pumped Nd:YAG lasers are combined with their polarization vectors at 90-degrees to each other to create a depolarized source suitable for propagation over long lengths of ordinary, low-birefringence single-mode fiber without a change in the polarization state. The source is demonstrated with an integrated-optical Mach-Zehnder interferometer and provides a constant -3-dB intensity input to the required linear input polarization state. RP BURNS, WK (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 9 TC 13 Z9 13 U1 0 U2 0 PU OPTICAL SOC AMER PI WASHINGTON PA 2010 MASSACHUSETTS AVE NW, WASHINGTON, DC 20036 SN 0146-9592 J9 OPT LETT JI Opt. Lett. PD MAR 15 PY 1991 VL 16 IS 6 BP 381 EP 383 DI 10.1364/OL.16.000381 PG 3 WC Optics SC Optics GA FA222 UT WOS:A1991FA22200011 PM 19773940 ER PT J AU BUCHOLTZ, F COLLIANDER, JE DANDRIDGE, A AF BUCHOLTZ, F COLLIANDER, JE DANDRIDGE, A TI THERMAL NOISE SPECTRUM OF A FIBEROPTIC MAGNETOSTRICTIVE TRANSDUCER SO OPTICS LETTERS LA English DT Article ID SENSORS AB We report the observation of the thermal equilibrium strain fluctuation spectrum in a transducer using a fiber interferometer. The thermal noise power spectrum in the range of 20-30 kHz of the metallic glass cylinder in this experiment is determined by the dynamic elastic susceptibility and has peak value corresponding to approximately 0.8-mu-rad/square-root Hz at 25.5 kHz. The data are analyzed by using the fluctuation-dissipation theorem and a coupled-mode model for dynamic response in metallic glass. C1 UNIV GREENBELT,RES FDN,GREENBELT,MD 20770. RP BUCHOLTZ, F (reprint author), USN,RES LAB,DIV OPT SCI,WASHINGTON,DC 20375, USA. RI Colliander, James/G-6285-2011 NR 8 TC 6 Z9 7 U1 0 U2 3 PU OPTICAL SOC AMER PI WASHINGTON PA 2010 MASSACHUSETTS AVE NW, WASHINGTON, DC 20036 SN 0146-9592 J9 OPT LETT JI Opt. Lett. PD MAR 15 PY 1991 VL 16 IS 6 BP 432 EP 434 DI 10.1364/OL.16.000432 PG 3 WC Optics SC Optics GA FA222 UT WOS:A1991FA22200028 PM 19773957 ER PT J AU SCHIEVE, WC BULSARA, AR DAVIS, GM AF SCHIEVE, WC BULSARA, AR DAVIS, GM TI SINGLE EFFECTIVE NEURON SO PHYSICAL REVIEW A LA English DT Article ID STATISTICAL PHYSICS; NETWORKS; MODEL AB We consider a network of N symmetrically interconnected neurons. Through the procedure of adiabatic elimination (separation of time scales), the dynamics of a single neuron is obtained, in closed form, from the system of coupled differential equations that describe the N-neuron problem. For the deterministic case, our approach yields an explicit form for the single-neuron "self-coupling" term J11. The case of noisy neurons containing both Langevin and multiplicative noise (in the synaptic connections) is also considered. C1 UNIV TEXAS,CTR STAT MECH,AUSTIN,TX 78712. UNIV TEXAS,DEPT PHYS,AUSTIN,TX 78712. NYU,COURANT INST MATH SCI,NEW YORK,NY 10012. NYU,COURANT INST MATH SCI,NEW YORK,NY 10012. RP SCHIEVE, WC (reprint author), USN,CTR OCEAN SYST,MAT RES BRANCH,SAN DIEGO,CA 92152, USA. NR 32 TC 25 Z9 25 U1 1 U2 1 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1050-2947 J9 PHYS REV A JI Phys. Rev. A PD MAR 15 PY 1991 VL 43 IS 6 BP 2613 EP 2623 DI 10.1103/PhysRevA.43.2613 PG 11 WC Optics; Physics, Atomic, Molecular & Chemical SC Optics; Physics GA FD045 UT WOS:A1991FD04500001 ER PT J AU LI, CP BOOK, DL AF LI, CP BOOK, DL TI INSTABILITY GENERATED BY ACCELERATION DUE TO RAREFACTION WAVES SO PHYSICAL REVIEW A LA English DT Note AB A new mechanism for instability in compressible fluid systems is described. A rarefaction wave induces acceleration, which can destabilize the system at a contact surface. The instability grows until the wave has passed. Residual motion can persist for long times thereafter, leading to significant enhancing of the mixing. To illustrate this mechanism, the Rayleigh-Taylor instability excited by a rarefaction wave at a density discontinuity is discussed and investigated numerically. RP LI, CP (reprint author), USN,RES LAB,COMPUTAT PHYS & FLUID DYNAM LAB,WASHINGTON,DC 20375, USA. NR 8 TC 3 Z9 3 U1 0 U2 1 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1050-2947 J9 PHYS REV A JI Phys. Rev. A PD MAR 15 PY 1991 VL 43 IS 6 BP 3153 EP 3156 DI 10.1103/PhysRevA.43.3153 PG 4 WC Optics; Physics, Atomic, Molecular & Chemical SC Optics; Physics GA FD045 UT WOS:A1991FD04500061 ER PT J AU SINGH, D AF SINGH, D TI GROUND-STATE PROPERTIES OF LANTHANUM - TREATMENT OF EXTENDED-CORE STATES SO PHYSICAL REVIEW B LA English DT Article ID PLANE-WAVE METHOD; BRILLOUIN-ZONE; ELECTRONIC-STRUCTURE; SPECIAL POINTS; ENERGY AB Three related techniques for performing accurate electronic-structure and total-energy calculations for systems with extended, so-called semicore, states are described. Total-energy calculations performed using the three methods are reported for fcc lanthanum. The convergence properties and relative accuracies of the three techniques are discussed. They are found to yield results in good agreement with each other and consistent with the available experimental data when well-converged calculations are performed. Highly accurate calculations are reported for the bcc phase, using one of these techniques, and a prediction of the bcc-fcc energy difference is reported. RP SINGH, D (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. RI Singh, David/I-2416-2012 NR 24 TC 465 Z9 469 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 MAR 15 PY 1991 VL 43 IS 8 BP 6388 EP 6392 DI 10.1103/PhysRevB.43.6388 PG 5 WC Physics, Condensed Matter SC Physics GA FC704 UT WOS:A1991FC70400010 ER PT J AU YU, RC SINGH, D KRAKAUER, H AF YU, RC SINGH, D KRAKAUER, H TI ALL-ELECTRON AND PSEUDOPOTENTIAL FORCE CALCULATIONS USING THE LINEARIZED-AUGMENTED-PLANE-WAVE METHOD SO PHYSICAL REVIEW B LA English DT Article ID TOTAL-ENERGY CALCULATIONS; TRANSITION-METALS; VIBRATIONAL FREQUENCIES; CHARGE-DENSITIES; BRILLOUIN-ZONE; SPECIAL POINTS; FORMALISM; SOLIDS AB All-electron and pseudopotential formulations for atomic forces in the linear-augmented-plane-wave (LAPW) method within the local-density approximation are presented. Due to the fact that the basis functions in the LAPW method (and in other linear muffin-tin-orbitals-based methods) have discontinuous second derivatives across the muffin-tin sphere boundaries, a large surface contribution to the incomplete-basis-set corrections to the Hellmann-Feynman force is shown to exist. The formulations are applied to frozen-phonon calculations in semiconductor, transition-metal, and noble-metal systems. The results are in excellent agreement with total-energy calculations and experiment. C1 USN,RES LAB,COMPLEX SYST THEORY BRANCH,WASHINGTON,DC 20375. RP YU, RC (reprint author), COLL WILLIAM & MARY,DEPT PHYS,WILLIAMSBURG,VA 23185, USA. RI Singh, David/I-2416-2012; OI Krakauer, Henry/0000-0003-2517-0957 NR 30 TC 214 Z9 214 U1 0 U2 6 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD MAR 15 PY 1991 VL 43 IS 8 BP 6411 EP 6422 DI 10.1103/PhysRevB.43.6411 PG 12 WC Physics, Condensed Matter SC Physics GA FC704 UT WOS:A1991FC70400013 ER PT J AU KAXIRAS, E AF KAXIRAS, E TI SEMICONDUCTOR-SURFACE RESTORATION BY VALENCE-MENDING ADSORBATES - APPLICATION TO SI(100)-S AND SI(100)-SE SO PHYSICAL REVIEW B LA English DT Note ID ELECTRONIC-STRUCTURE; GE(111); STATES AB A set of criteria is proposed for choosing adsorbates that can lead to restoration of the ideal bulk-terminated geometry on semiconductor surfaces. Two systems, Si(100):S and Si(100):Se, which are likely to fulfill the surface-restoration criteria are investigated in detail through first-principles calculations. These restored surfaces are energetically stable against structural changes such as embedding the adsorbates in subsurfaces sites. C1 SACHS FREEMAN ASSOCIATES INC, LANDOVER, MD 20785 USA. RP KAXIRAS, E (reprint author), USN, RES LAB, COMPLEX SYST THEORY BRANCH, WASHINGTON, DC 20375 USA. NR 19 TC 89 Z9 93 U1 0 U2 2 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD MAR 15 PY 1991 VL 43 IS 8 BP 6824 EP 6827 DI 10.1103/PhysRevB.43.6824 PG 4 WC Physics, Condensed Matter SC Physics GA FC704 UT WOS:A1991FC70400076 ER PT J AU TRITT, TM EHRLICH, AC GILLESPIE, DJ TESSEMA, GX AF TRITT, TM EHRLICH, AC GILLESPIE, DJ TESSEMA, GX TI EFFECT OF AN APPLIED MAGNETIC-FIELD ON THE CHARGE-DENSITY-WAVE CARRIER CONCENTRATION IN NBSE3 SO PHYSICAL REVIEW B LA English DT Article ID ELECTRIC-FIELD; SLIDING-MODE; TRANSPORT-PROPERTIES; NIOBIUM TRISELENIDE; PHASE-TRANSITION; CONDUCTION NOISE; OSCILLATIONS; MOTION; MAGNETOTHERMOPOWER; MAGNETORESISTANCE AB We report measurements of the resistance and narrow-band noise (NBN) in NbSe3 for magnetic fields from 0 to 9.6 T and temperatures from 24 to 55 K. We have observed that the magnetic field has a very small effect on the charge-density-wave (CDW) carrier concentration in the lower temperature range 24 < T < 38 K. Above T almost-equal-to 40 K, the application of a magnetic field has essentially no discernible effect on n(CDW). We have analyzed the data in such a way as to investigate any influence Joule heating might have on the data, especially in the lower-temperature range. We find that for T < 38 K an applied magnetic field of 9.6 T changes the CDW carrier concentration obtained from the slope of the CDW current versus NBN frequency curves by approximately less-than-or-equal-to 5-6 %. C1 CLEMSON UNIV,DEPT PHYS,CLEMSON,SC 29634. RP TRITT, TM (reprint author), USN,RES LAB,MAT PHYS BRANCH,WASHINGTON,DC 20375, USA. NR 44 TC 16 Z9 16 U1 1 U2 8 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD MAR 15 PY 1991 VL 43 IS 9 BP 7254 EP 7262 DI 10.1103/PhysRevB.43.7254 PG 9 WC Physics, Condensed Matter SC Physics GA FD389 UT WOS:A1991FD38900043 ER PT J AU PEDERSON, MR JACKSON, KA AF PEDERSON, MR JACKSON, KA TI PSEUDOENERGIES FOR SIMULATIONS ON METALLIC SYSTEMS SO PHYSICAL REVIEW B LA English DT Note ID DENSITY-FUNCTIONAL THEORY; MOLECULAR-DYNAMICS AB A variational treatment of the occupation numbers in the local-density approximation that incorporates variable pseudoenergies, rather than the Kohn-Sham eigenvalues, into the Fermi-Dirac distribution functions is introduced. Iterative gradient algorithms are used for direct variation of the pseudoenergies. Static and quasidynamical simulations on C2, Al4, and Al12Mn are presented. RP USN, RES LAB, COMPLEX SYST THEORY BRANCH, WASHINGTON, DC 20375 USA. OI Jackson, Koblar/0000-0002-5342-7978 NR 17 TC 115 Z9 115 U1 0 U2 1 PU AMER PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 2469-9950 EI 2469-9969 J9 PHYS REV B JI Phys. Rev. B PD MAR 15 PY 1991 VL 43 IS 9 BP 7312 EP 7315 DI 10.1103/PhysRevB.43.7312 PG 4 WC Physics, Condensed Matter SC Physics GA FD389 UT WOS:A1991FD38900053 ER PT J AU KERSEY, AD MARRONE, MJ DAVIS, MA AF KERSEY, AD MARRONE, MJ DAVIS, MA TI STATISTICAL MODELING OF POLARIZATION INDUCED FADING IN INTERFEROMETRIC FIBER SENSORS SO ELECTRONICS LETTERS LA English DT Article DE INTERFEROMETRIC FIBER SENSORS; MODELING; OPTICAL FIBERS ID POLARIZATION AB The probability functions associated with the polarisation parameters of an optical fibre interferometer, and the concomitant polarisation fading problems which arises have been experimentally and theoretically investigated. Good agreement between experimental results and theoretical models are obtained. RP KERSEY, AD (reprint author), USN,RES LAB,DIV OPT SCI,WASHINGTON,DC 20375, USA. NR 7 TC 1 Z9 1 U1 0 U2 0 PU IEE-INST ELEC ENG PI HERTFORD PA MICHAEL FARADAY HOUSE SIX HILLS WAY STEVENAGE, HERTFORD, ENGLAND SG1 2AY SN 0013-5194 J9 ELECTRON LETT JI Electron. Lett. PD MAR 14 PY 1991 VL 27 IS 6 BP 481 EP 483 DI 10.1049/el:19910303 PG 3 WC Engineering, Electrical & Electronic SC Engineering GA FD312 UT WOS:A1991FD31200001 ER PT J AU KERSEY, AD MARRONE, MJ DAVIS, MA AF KERSEY, AD MARRONE, MJ DAVIS, MA TI POLARIZATION-INSENSITIVE FIBER OPTIC MICHELSON INTERFEROMETER SO ELECTRONICS LETTERS LA English DT Article DE FIBER OPTIC SENSORS; POLARIZATION; INTERFEROMETERS ID INPUT-POLARIZATION; FIBER; SENSORS AB A polarisation-insensitive fibre optic Michelson interferometric sensor configuration is demonstrated. The approach is based on the use of birefringence compensation in a retraced fibre path using Faraday rotator mirror elements. RP KERSEY, AD (reprint author), USN,RES LAB,OPT TECH BRANCH,CODE 6574,WASHINGTON,DC 20375, USA. NR 9 TC 117 Z9 140 U1 6 U2 15 PU IEE-INST ELEC ENG PI HERTFORD PA MICHAEL FARADAY HOUSE SIX HILLS WAY STEVENAGE, HERTFORD, ENGLAND SG1 2AY SN 0013-5194 J9 ELECTRON LETT JI Electron. Lett. PD MAR 14 PY 1991 VL 27 IS 6 BP 518 EP 520 DI 10.1049/el:19910325 PG 3 WC Engineering, Electrical & Electronic SC Engineering GA FD312 UT WOS:A1991FD31200023 ER PT J AU DULING, IN AF DULING, IN TI SUBPICOSECOND ALL-FIBER ERBIUM LASER SO ELECTRONICS LETTERS LA English DT Article DE OPTICAL FIBERS; LASERS; NONLINEAR OPTICS ID SOLITON AB A nonlinear amplifying loop mirror has been turned into a laser by feedback of the output to the input through a fibre-pigtailed optical isolator. After some optimisation, pulses as short as 314 fs were produced. The pump powers are low enough that laser diodes could be used for pumping. RP DULING, IN (reprint author), USN,RES LAB,CODE 6570,WASHINGTON,DC 20375, USA. NR 8 TC 232 Z9 235 U1 3 U2 18 PU IEE-INST ELEC ENG PI HERTFORD PA MICHAEL FARADAY HOUSE SIX HILLS WAY STEVENAGE, HERTFORD, ENGLAND SG1 2AY SN 0013-5194 J9 ELECTRON LETT JI Electron. Lett. PD MAR 14 PY 1991 VL 27 IS 6 BP 544 EP 545 DI 10.1049/el:19910342 PG 2 WC Engineering, Electrical & Electronic SC Engineering GA FD312 UT WOS:A1991FD31200040 ER PT J AU DEENEY, C NASH, T PRASAD, RR WARREN, L APRUZESE, JP AF DEENEY, C NASH, T PRASAD, RR WARREN, L APRUZESE, JP TI K-SHELL X-RAY-EMISSION FROM SODIUM WIRE ARRAY IMPLOSIONS AS THE PUMP FOR THE SODIUM-NEON X-RAY LASER SCHEME SO APPLIED PHYSICS LETTERS LA English DT Article ID PLASMA AB A technique to extrude pure sodium wires has been developed and this has allowed the implosion of sodium wire arrays on the 4 MA, 6 TW Double Eagle generator. A maximum K-shell x-ray yield of 35 kJ was achieved. Of particular interest, as regards the sodium-neon x-ray laser scheme, is the measured 150 GW, 8 kJ in the NaX 1s2-1s2p 1P line at 11.0027 angstrom. C1 USN,RES LAB,WASHINGTON,DC 20375. RP DEENEY, C (reprint author), PHYS INT CO,2700 MERCED ST,SAN LEANDRO,CA 94577, USA. NR 14 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 0003-6951 J9 APPL PHYS LETT JI Appl. Phys. Lett. PD MAR 11 PY 1991 VL 58 IS 10 BP 1021 EP 1023 DI 10.1063/1.104411 PG 3 WC Physics, Applied SC Physics GA FA939 UT WOS:A1991FA93900010 ER PT J AU ARMSTRONG, DW THOMAS, JR AF ARMSTRONG, DW THOMAS, JR TI ALTERATIONS IN RESTING OXYGEN-CONSUMPTION IN WOMEN EXPOSED TO 10 DAYS OF COLD AIR SO FASEB JOURNAL LA English DT Meeting Abstract C1 USN,MED RES INST,BETHESDA,MD 20889. NR 0 TC 2 Z9 2 U1 2 U2 2 PU FEDERATION AMER SOC EXP BIOL PI BETHESDA PA 9650 ROCKVILLE PIKE, BETHESDA, MD 20814-3998 SN 0892-6638 J9 FASEB J JI Faseb J. PD MAR 11 PY 1991 VL 5 IS 4 BP A393 EP A393 PN 1 PG 1 WC Biochemistry & Molecular Biology; Biology; Cell Biology SC Biochemistry & Molecular Biology; Life Sciences & Biomedicine - Other Topics; Cell Biology GA FC207 UT WOS:A1991FC20700128 ER PT J AU DALESANDRO, M REED, L MALIK, M QUESADA, M HESSLINK, R CASTRO, S HOMER, L YOUNG, B AF DALESANDRO, M REED, L MALIK, M QUESADA, M HESSLINK, R CASTRO, S HOMER, L YOUNG, B TI PORCINE MONONUCLEAR LEUKOCYTE NUCLEAR THYROID-HORMONE RECEPTORS - EFFECTS OF COLD-EXPOSURE ON RECEPTOR KINETICS SO FASEB JOURNAL LA English DT Meeting Abstract C1 USN,MED RES INST,BETHESDA,MD 20889. UNIV ALBERTA,EDMONTON T6G 2P5,ALBERTA,CANADA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU FEDERATION AMER SOC EXP BIOL PI BETHESDA PA 9650 ROCKVILLE PIKE, BETHESDA, MD 20814-3998 SN 0892-6638 J9 FASEB J JI Faseb J. PD MAR 11 PY 1991 VL 5 IS 4 BP A395 EP A395 PN 1 PG 1 WC Biochemistry & Molecular Biology; Biology; Cell Biology SC Biochemistry & Molecular Biology; Life Sciences & Biomedicine - Other Topics; Cell Biology GA FC207 UT WOS:A1991FC20700140 ER PT J AU DOUBT, TJ ROBERTS, JM TAYLOR, NAS AF DOUBT, TJ ROBERTS, JM TAYLOR, NAS TI EFFECTS OF PYRIDOSTIGMINE UPON RESPIRATORY CONTROL WHILE BREATHING 100-PERCENT O2 DURING WARM WATER EXERCISE SO FASEB JOURNAL LA English DT Meeting Abstract C1 USN,MED RES INST,BETHESDA,MD 20889. RI Taylor, Nigel/A-1975-2014 NR 0 TC 0 Z9 0 U1 0 U2 1 PU FEDERATION AMER SOC EXP BIOL PI BETHESDA PA 9650 ROCKVILLE PIKE, BETHESDA, MD 20814-3998 SN 0892-6638 J9 FASEB J JI Faseb J. PD MAR 11 PY 1991 VL 5 IS 4 BP A768 EP A768 PN 1 PG 1 WC Biochemistry & Molecular Biology; Biology; Cell Biology SC Biochemistry & Molecular Biology; Life Sciences & Biomedicine - Other Topics; Cell Biology GA FC207 UT WOS:A1991FC20702308 ER PT J AU FLOYD, E HACKNEY, AC HODGDON, JA COYNE, JT KELLEHER, DL AF FLOYD, E HACKNEY, AC HODGDON, JA COYNE, JT KELLEHER, DL TI ENDOCRINE-METABOLIC RESPONSES TO MILITARY FIELD OPERATIONS - EFFECTS OF COLD AND MODERATE ALTITUTE EXPOSURE SO FASEB JOURNAL LA English DT Meeting Abstract C1 UNIV N CAROLINA,CHAPEL HILL,NC 27599. NHRC,SAN DIEGO,CA 92138. RI HACKNEY, ANTHONY/D-9521-2013 NR 0 TC 1 Z9 1 U1 0 U2 0 PU FEDERATION AMER SOC EXP BIOL PI BETHESDA PA 9650 ROCKVILLE PIKE, BETHESDA, MD 20814-3998 SN 0892-6638 J9 FASEB J JI Faseb J. PD MAR 11 PY 1991 VL 5 IS 4 BP A393 EP A393 PN 1 PG 1 WC Biochemistry & Molecular Biology; Biology; Cell Biology SC Biochemistry & Molecular Biology; Life Sciences & Biomedicine - Other Topics; Cell Biology GA FC207 UT WOS:A1991FC20700130 ER PT J AU HESSLINK, RL QUESADA, M DALESANDRO, M HOMER, LD REED, HL CHRISTOPHERSON, R YOUNG, BA AF HESSLINK, RL QUESADA, M DALESANDRO, M HOMER, LD REED, HL CHRISTOPHERSON, R YOUNG, BA TI THE EFFECT OF COLD ON SERUM THYROID-HORMONES AND HEPATIC 5'MONO-DEIODINASE ACTIVITY SO FASEB JOURNAL LA English DT Meeting Abstract C1 USN,MED RES INST,BETHESDA,MD 20889. UNIV ALBERTA,EDMONTON T6G 2P5,ALBERTA,CANADA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU FEDERATION AMER SOC EXP BIOL PI BETHESDA PA 9650 ROCKVILLE PIKE, BETHESDA, MD 20814-3998 SN 0892-6638 J9 FASEB J JI Faseb J. PD MAR 11 PY 1991 VL 5 IS 4 BP A394 EP A394 PN 1 PG 1 WC Biochemistry & Molecular Biology; Biology; Cell Biology SC Biochemistry & Molecular Biology; Life Sciences & Biomedicine - Other Topics; Cell Biology GA FC207 UT WOS:A1991FC20700139 ER PT J AU HYDE, D STEVENS, DM HABERMAN, KJ THORP, JW DOUBT, TJ AF HYDE, D STEVENS, DM HABERMAN, KJ THORP, JW DOUBT, TJ TI EFFECTS OF PYRIDOSTIGMINE ON HYDRATION STATUS DURING WARM WATER DIVING SO FASEB JOURNAL LA English DT Meeting Abstract C1 USN,MED RES INST,BETHESDA,MD 20889. NR 0 TC 0 Z9 0 U1 0 U2 0 PU FEDERATION AMER SOC EXP BIOL PI BETHESDA PA 9650 ROCKVILLE PIKE, BETHESDA, MD 20814-3998 SN 0892-6638 J9 FASEB J JI Faseb J. PD MAR 11 PY 1991 VL 5 IS 4 BP A766 EP A766 PN 1 PG 1 WC Biochemistry & Molecular Biology; Biology; Cell Biology SC Biochemistry & Molecular Biology; Life Sciences & Biomedicine - Other Topics; Cell Biology GA FC207 UT WOS:A1991FC20702296 ER PT J AU KAUFMAN, JW HANNA, LM ASKEW, GK WEINMANN, GG AF KAUFMAN, JW HANNA, LM ASKEW, GK WEINMANN, GG TI HUMAN NASAL CAVITY AIR AND MUCOSAL TEMPERATURES SO FASEB JOURNAL LA English DT Meeting Abstract C1 JOHNS HOPKINS UNIV,BALTIMORE,MD 21218. UNIV PENN,PHILADELPHIA,PA 19104. USN,CTR AIR DEV,WARMINSTER,PA 18974. NR 0 TC 0 Z9 0 U1 0 U2 0 PU FEDERATION AMER SOC EXP BIOL PI BETHESDA PA 9650 ROCKVILLE PIKE, BETHESDA, MD 20814-3998 SN 0892-6638 J9 FASEB J JI Faseb J. PD MAR 11 PY 1991 VL 5 IS 4 BP A377 EP A377 PN 1 PG 1 WC Biochemistry & Molecular Biology; Biology; Cell Biology SC Biochemistry & Molecular Biology; Life Sciences & Biomedicine - Other Topics; Cell Biology GA FC207 UT WOS:A1991FC20700036 ER PT J AU KOWALSKI, K REED, L LOPEZ, A SMITH, D WILLIAMS, S DALESANDRO, M HOMER, L AF KOWALSKI, K REED, L LOPEZ, A SMITH, D WILLIAMS, S DALESANDRO, M HOMER, L TI CHANGES IN ENERGY-INTAKE AND TRIIODOTHYRONINE (T3) KINETICS WITH EXTENDED ARCTIC WINTER OPERATIONS (EAO) SO FASEB JOURNAL LA English DT Meeting Abstract C1 USN,MED RES INST,BETHESDA,MD 20889. NR 0 TC 0 Z9 0 U1 0 U2 0 PU FEDERATION AMER SOC EXP BIOL PI BETHESDA PA 9650 ROCKVILLE PIKE, BETHESDA, MD 20814-3998 SN 0892-6638 J9 FASEB J JI Faseb J. PD MAR 11 PY 1991 VL 5 IS 4 BP A393 EP A393 PN 1 PG 1 WC Biochemistry & Molecular Biology; Biology; Cell Biology SC Biochemistry & Molecular Biology; Life Sciences & Biomedicine - Other Topics; Cell Biology GA FC207 UT WOS:A1991FC20700129 ER PT J AU LEE, CH JONG, JS KANG, YH AF LEE, CH JONG, JS KANG, YH TI ANTIIDIOTYPIC MONOCLONAL-ANTIBODIES WITH INTERNAL IMAGE OF LIPID-A SO FASEB JOURNAL LA English DT Meeting Abstract C1 USN,MED RES INST,BETHESDA,MD 20814. NR 0 TC 0 Z9 0 U1 0 U2 0 PU FEDERATION AMER SOC EXP BIOL PI BETHESDA PA 9650 ROCKVILLE PIKE, BETHESDA, MD 20814-3998 SN 0892-6638 J9 FASEB J JI Faseb J. PD MAR 11 PY 1991 VL 5 IS 4 BP A464 EP A464 PN 1 PG 1 WC Biochemistry & Molecular Biology; Biology; Cell Biology SC Biochemistry & Molecular Biology; Life Sciences & Biomedicine - Other Topics; Cell Biology GA FC207 UT WOS:A1991FC20700539 ER PT J AU LOPEZ, A REED, L DALESANDRO, M AF LOPEZ, A REED, L DALESANDRO, M TI CHANGES IN HEMATOLOGICAL PROFILES DURING WINTER FIELD OPERATIONS SO FASEB JOURNAL LA English DT Meeting Abstract C1 USN,MED RES INST,BETHESDA,MD 20889. NR 0 TC 0 Z9 0 U1 0 U2 0 PU FEDERATION AMER SOC EXP BIOL PI BETHESDA PA 9650 ROCKVILLE PIKE, BETHESDA, MD 20814-3998 SN 0892-6638 J9 FASEB J JI Faseb J. PD MAR 11 PY 1991 VL 5 IS 4 BP A393 EP A393 PN 1 PG 1 WC Biochemistry & Molecular Biology; Biology; Cell Biology SC Biochemistry & Molecular Biology; Life Sciences & Biomedicine - Other Topics; Cell Biology GA FC207 UT WOS:A1991FC20700131 ER PT J AU LOTZ, WG SAXTON, JL AF LOTZ, WG SAXTON, JL TI ENDOCRINE RESPONSES IN THE RHESUS-MONKEY DURING ACUTE COLD-EXPOSURE SO FASEB JOURNAL LA English DT Meeting Abstract C1 USN,AEROSP MED RES LAB,PENSACOLA,FL 32508. NR 0 TC 0 Z9 0 U1 0 U2 0 PU FEDERATION AMER SOC EXP BIOL PI BETHESDA PA 9650 ROCKVILLE PIKE, BETHESDA, MD 20814-3998 SN 0892-6638 J9 FASEB J JI Faseb J. PD MAR 11 PY 1991 VL 5 IS 4 BP A395 EP A395 PN 1 PG 1 WC Biochemistry & Molecular Biology; Biology; Cell Biology SC Biochemistry & Molecular Biology; Life Sciences & Biomedicine - Other Topics; Cell Biology GA FC207 UT WOS:A1991FC20700144 ER PT J AU QUESADA, MH REED, HL HESSLINK, R LICAUCO, G CASTRO, S HOMER, L YOUNG, B AF QUESADA, MH REED, HL HESSLINK, R LICAUCO, G CASTRO, S HOMER, L YOUNG, B TI COLD-EXPOSURE INDUCES ALTERATIONS IN PORCINE TRIIODOTHYRONINE TISSUE DISTRIBUTION SO FASEB JOURNAL LA English DT Meeting Abstract C1 USN,MED RES INST,BETHESDA,MD 20889. UNIV ALBERTA,EDMONTON T6G 2P5,ALBERTA,CANADA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU FEDERATION AMER SOC EXP BIOL PI BETHESDA PA 9650 ROCKVILLE PIKE, BETHESDA, MD 20814-3998 SN 0892-6638 J9 FASEB J JI Faseb J. PD MAR 11 PY 1991 VL 5 IS 4 BP A395 EP A395 PN 1 PG 1 WC Biochemistry & Molecular Biology; Biology; Cell Biology SC Biochemistry & Molecular Biology; Life Sciences & Biomedicine - Other Topics; Cell Biology GA FC207 UT WOS:A1991FC20700141 ER PT J AU REED, L QUESADA, M DALESANDRO, M HESSLINK, R CASTRO, S HOMER, L CHRISTOPHERSON, R YOUNG, B AF REED, L QUESADA, M DALESANDRO, M HESSLINK, R CASTRO, S HOMER, L CHRISTOPHERSON, R YOUNG, B TI CHANGES IN PORCINE SERUM TRIIODOTHYRONINE (T3) KINETICS WITH COLD-EXPOSURE SO FASEB JOURNAL LA English DT Meeting Abstract C1 USN,MED RES INST,BETHESDA,MD 20899. UNIV ALBERTA,EDMONTON T6G 2P5,ALBERTA,CANADA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU FEDERATION AMER SOC EXP BIOL PI BETHESDA PA 9650 ROCKVILLE PIKE, BETHESDA, MD 20814-3998 SN 0892-6638 J9 FASEB J JI Faseb J. PD MAR 11 PY 1991 VL 5 IS 4 BP A395 EP A395 PN 1 PG 1 WC Biochemistry & Molecular Biology; Biology; Cell Biology SC Biochemistry & Molecular Biology; Life Sciences & Biomedicine - Other Topics; Cell Biology GA FC207 UT WOS:A1991FC20700143 ER PT J AU RYAN, JJ SNEED, RA MOND, JJ FINKELMAN, FD AF RYAN, JJ SNEED, RA MOND, JJ FINKELMAN, FD TI PRIMARY INFLUENCE OF THE MAJOR HISTOCOMPATIBILITY COMPLEX (MHC) OVER A NON-MHC MODIFIER GENE IN THE PRESENTATION OF AN M1S SUPERANTIGEN SO FASEB JOURNAL LA English DT Meeting Abstract C1 USN,MED RES INST,BETHESDA,MD 20814. GEOCENTERS INC,BETHESDA,MD 20814. UNIFORMED SERV UNIV HLTH SCI,BETHESDA,MD 20814. NR 0 TC 0 Z9 0 U1 0 U2 0 PU FEDERATION AMER SOC EXP BIOL PI BETHESDA PA 9650 ROCKVILLE PIKE, BETHESDA, MD 20814-3998 SN 0892-6638 J9 FASEB J JI Faseb J. PD MAR 11 PY 1991 VL 5 IS 4 BP A618 EP A618 PN 1 PG 1 WC Biochemistry & Molecular Biology; Biology; Cell Biology SC Biochemistry & Molecular Biology; Life Sciences & Biomedicine - Other Topics; Cell Biology GA FC207 UT WOS:A1991FC20701436 ER PT J AU SUBA, EA MCKENNA, TM WILLIAMS, TJ AF SUBA, EA MCKENNA, TM WILLIAMS, TJ TI DISPARATE INFLUENCE OF SEPSIS ON VASCULAR CONTRACTILE FUNCTION IN THE PIG SO FASEB JOURNAL LA English DT Meeting Abstract C1 USN,MED RES INST,BETHESDA,MD 20899. NR 0 TC 0 Z9 0 U1 0 U2 0 PU FEDERATION AMER SOC EXP BIOL PI BETHESDA PA 9650 ROCKVILLE PIKE, BETHESDA, MD 20814-3998 SN 0892-6638 J9 FASEB J JI Faseb J. PD MAR 11 PY 1991 VL 5 IS 4 BP A781 EP A781 PN 1 PG 1 WC Biochemistry & Molecular Biology; Biology; Cell Biology SC Biochemistry & Molecular Biology; Life Sciences & Biomedicine - Other Topics; Cell Biology GA FC207 UT WOS:A1991FC20702388 ER PT J AU YAMADA, H MOND, JJ FINKELMAN, FD JUNE, CH SNAPPER, CM AF YAMADA, H MOND, JJ FINKELMAN, FD JUNE, CH SNAPPER, CM TI 2 DISTINCTIVE TYPES OF INTRACELLULAR CALCIUM RESPONSES BY CROSS-LINKAGE OF MURINE-B CELL-MEMBRANE PROTEINS SO FASEB JOURNAL LA English DT Meeting Abstract C1 UNIFORMED SERV UNIV HLTH SCI,DEPT PATHOL,BETHESDA,MD 20814. UNIFORMED SERV UNIV HLTH SCI,DEPT MED,BETHESDA,MD 20814. USN,MED RES INST,BETHESDA,MD 20814. NR 0 TC 0 Z9 0 U1 0 U2 0 PU FEDERATION AMER SOC EXP BIOL PI BETHESDA PA 9650 ROCKVILLE PIKE, BETHESDA, MD 20814-3998 SN 0892-6638 J9 FASEB J JI Faseb J. PD MAR 11 PY 1991 VL 5 IS 4 BP A609 EP A609 PN 1 PG 1 WC Biochemistry & Molecular Biology; Biology; Cell Biology SC Biochemistry & Molecular Biology; Life Sciences & Biomedicine - Other Topics; Cell Biology GA FC207 UT WOS:A1991FC20701383 ER PT J AU SZPAK, S MOSIERBOSS, PA SMITH, JJ AF SZPAK, S MOSIERBOSS, PA SMITH, JJ TI ON THE BEHAVIOR OF PD DEPOSITED IN THE PRESENCE OF EVOLVING DEUTERIUM SO JOURNAL OF ELECTROANALYTICAL CHEMISTRY LA English DT Note C1 US DOE,WASHINGTON,DC 20545. RP SZPAK, S (reprint author), USN,CTR OCEAN SYST,SAN DIEGO,CA 92152, USA. NR 5 TC 22 Z9 22 U1 0 U2 0 PU ELSEVIER SCIENCE SA LAUSANNE PI LAUSANNE 1 PA PO BOX 564, 1001 LAUSANNE 1, SWITZERLAND SN 0022-0728 J9 J ELECTROANAL CHEM JI J. Electroanal. Chem. PD MAR 11 PY 1991 VL 302 IS 1-2 BP 255 EP 260 DI 10.1016/0022-0728(91)85044-P PG 6 WC Chemistry, Analytical; Electrochemistry SC Chemistry; Electrochemistry GA FE474 UT WOS:A1991FE47400017 ER PT J AU TAYAL, SS HENRY, RJW KEENAN, FP MCCANN, SM WIDING, KG AF TAYAL, SS HENRY, RJW KEENAN, FP MCCANN, SM WIDING, KG TI FE-XII LINE RATIOS IN SOLAR-FLARES SO ASTROPHYSICAL JOURNAL LA English DT Article DE ATOMIC PROCESSES; SUN FLARES; SUN SPECTRA; X-RAYS SPECTRA ID ELECTRON-DENSITY DIAGNOSTICS; OSCILLATOR-STRENGTHS; XUV OBSERVATIONS; COMPACT FLARE; ENERGY-LEVELS; TRANSITIONS; CORONA; EXCITATION; SPECTRUM; PLASMA AB Relative level populations and the density-sensitive emission-line ratios R1 = I(186.87 angstrom)/I(193.51 angstrom), R2 = I(196.64 angstrom)/I(193.51 angstrom), and R3 = I(191.05 angstrom)/I(193.51 angstrom) are derived using the recent R-matrix calculations of electron impact excitation rates for Fe XII over a wide range of electron densities (10(9)-10(12) cm-3) and at an electron temperature of 1.5 x 10(6) K. These results are applied to solar active region and flare spectra obtained by the Naval Research Laboratory's S082A slitless spectrograph on board Skylab. Excellent agreement is found with observations. The electron densities deduced from Fe XII line ratios are also in agreement with those determined from Fe XIII and Fe XIV. C1 AUBURN UNIV,DEPT PHYS,AUBURN,AL 36849. QUEENS UNIV BELFAST,DEPT PURE & APPL PHYS,BELFAST BT7 1NN,ANTRIM,NORTH IRELAND. USN,RES LAB,EO HULBURT CTR SPACE RES,WASHINGTON,DC 20375. RP TAYAL, SS (reprint author), LOUISIANA STATE UNIV,DEPT PHYS & ASTRON,BATON ROUGE,LA 70803, USA. NR 24 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 MAR 10 PY 1991 VL 369 IS 2 BP 567 EP 569 DI 10.1086/169786 PN 1 PG 3 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA EY637 UT WOS:A1991EY63700028 ER PT J AU MEIER, RR WIDING, KG FELDMAN, U AF MEIER, RR WIDING, KG FELDMAN, U TI ANALYSIS OF THE SOLAR O-II/O-III MULTIPLETS AT 834-A - IMPLICATIONS FOR THE EMISSION MEASURE DISTRIBUTION IN THE VICINITY OF 40,000-K SO ASTROPHYSICAL JOURNAL LA English DT Article DE SUN CHROMOSPHERE; SUN SPECTRA ID QUIET-SUN; SPECTRUM; LINES; LIMB AB A previously unpublished very high resolution solar spectrum has been analyzed to determine the relative contributions of O II and O III at 834 angstrom. The resulting ratio of O II to O III emissions is found to be 0.35, which is lower than derived from lower resolution data or expected from calculations based on standard emission measure theory. In order to reproduce the ratio observed in the high-resolution spectrum, it is proposed to lower the emission measure in the vicinity of 40,000 K by a factor of 2. This would also reconcile differences among apparently discrepant lines of C II and is consistent with the physical interpretation that the emission measure between 10(4) and 10(5) K is comprised of components arising from physically different regimes in the solar atmosphere. 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 22 TC 12 Z9 12 U1 0 U2 0 PU UNIV CHICAGO PRESS PI CHICAGO PA 5720 S WOODLAWN AVE, CHICAGO, IL 60637 SN 0004-637X J9 ASTROPHYS J JI Astrophys. J. PD MAR 10 PY 1991 VL 369 IS 2 BP 570 EP 573 DI 10.1086/169787 PN 1 PG 4 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA EY637 UT WOS:A1991EY63700029 ER PT J AU HOLTZMAN, JA GROTH, EJ LIGHT, RM FABER, SM HUNTER, D ONEIL, EJ SHAYA, EJ BAUM, WA CAMPBELL, B CODE, A CURRIE, DG EWALD, SP HESTER, JJ KELSALL, T LAUER, TR LYNDS, R SCHNEIDER, DP SEIDELMANN, PK WESTPHAL, JA AF HOLTZMAN, JA GROTH, EJ LIGHT, RM FABER, SM HUNTER, D ONEIL, EJ SHAYA, EJ BAUM, WA CAMPBELL, B CODE, A CURRIE, DG EWALD, SP HESTER, JJ KELSALL, T LAUER, TR LYNDS, R SCHNEIDER, DP SEIDELMANN, PK WESTPHAL, JA TI STELLAR PHOTOMETRY WITH THE HUBBLE SPACE TELESCOPE WIDE-FIELD PLANETARY CAMERA - A PROGRESS REPORT SO ASTROPHYSICAL JOURNAL LA English DT Article DE IMAGE PROCESSING; PHOTOMETRY ID IMAGES AB We describe the prospects for the use of the Wide-Field/Planetary Camera (WFPC) for stellar photometry. The large halos of the point-spread function (PSF) resulting from spherical aberration and from spatial, temporal, and color variations of the PSF are the main limitations to accurate photometry. Degradations caused by crowding are exacerbated by the halos of the PSF. Here we attempt to quantify these effects and determine the current accuracy of stellar photometry with the WFPC. In realistic cases, the brighter stars in crowded fields have 0.09 mag errors; fainter stars have larger errors depending on the degree of crowding. We find that measuring Cepheids in Virgo Cluster galaxies is not currently possible without inordinate increases in exposure times. C1 PRINCETON UNIV,DEPT PHYS,PRINCETON,NJ 08544. UNIV CALIF SANTA CRUZ,LICK OBSERV,BOARD STUDIES ASTRON & ASTROPHYS,SANTA CRUZ,CA 95064. NATL OPT ASTRON OBSERV,TUCSON,AZ 85726. UNIV MARYLAND,DEPT PHYS & ASTRON,COLLEGE PK,MD 20742. UNIV WASHINGTON,DEPT ASTRON,SEATTLE,WA 98105. UNIV NEW MEXICO,DEPT PHYS,ALBUQUERQUE,NM 87131. UNIV WISCONSIN,WASHBURN OBSERV,MADISON,WI 53706. SPACE TELESCOPE SCI INST,BALTIMORE,MD 21218. CALTECH,CTR INFRARED PROC & ANAL,PASADENA,CA 91125. NASA,GODDARD SPACE FLIGHT CTR,GREENBELT,MD 20771. INST ADV STUDY,PRINCETON,NJ 08540. USN OBSERV,NATL ALMANAC OFF,WASHINGTON,DC 20390. CALTECH,DIV GEOL & PLANETARY SCI,PASADENA,CA 91125. RP HOLTZMAN, JA (reprint author), LOWELL OBSERV,1400 W MARS HILL RD,FLAGSTAFF,AZ 86001, USA. NR 15 TC 29 Z9 29 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 MAR 10 PY 1991 VL 369 IS 2 BP L35 EP & DI 10.1086/185953 PN 2 PG 0 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA EY641 UT WOS:A1991EY64100004 ER PT J AU LYNDS, R FABER, SM GROTH, EJ HOLTZMAN, JA LIGHT, RM ONEIL, EJ BAUM, WA CURRIE, DG EWALD, SP HESTER, JJ KRISTIAN, JA SEIDELMANN, PK SHAYA, EJ WESTPHAL, JA AF LYNDS, R FABER, SM GROTH, EJ HOLTZMAN, JA LIGHT, RM ONEIL, EJ BAUM, WA CURRIE, DG EWALD, SP HESTER, JJ KRISTIAN, JA SEIDELMANN, PK SHAYA, EJ WESTPHAL, JA TI NGC-1068 - RESOLUTION OF NUCLEAR-STRUCTURE IN THE OPTICAL CONTINUUM SO ASTROPHYSICAL JOURNAL LA English DT Article DE GALAXIES, INDIVIDUAL (NGC-1068); GALAXIES, SEYFERT ID GALAXY NGC 1068 AB An optical continuum image of the Seyfert galaxy NGC 1068 has been obtained with the Planetary Camera on the Hubble Space Telescope as part of the SAO/ERO program. The filter used, F547M, has an effective wavelength and a width of approximately 5470 and 650 angstrom and excludes all discrete emission lines that might be present. The point-spread function, although compromised by the aberrations of the telescope optics, does permit significant response at the 0.1" resolution originally anticipated. Deconvolution of the image for the effects of the point-spread function reveals a bright nucleus embedded in an irregular cloudlike structure which is well differentiated against the background of the galaxy. The nucleus is resolved, with a FWHM of approximately 0.15", or 11 pc and there is no evidence for any unresolved nuclear component. The lack of an unresolved point source is consistent with the picture in which the broad-line region is seen indirectly via electron scattering, but the precise geometry of the scattering region cannot yet be inferred. The cloud surrounding the nucleus is elongated in the NE-SW direction and has extreme dimensions of 3.5" x 1.7" (255 x 124 pc). Although the extent of the cloud is roughly centered on the nucleus, its brightness centroid is situated 0.4" southwest of the nucleus. Because of the relative photometric dominance of the cloud with respect to both the nucleus and the underlying galaxy and the corresponding dominance of unpolarized star light found by Antonucci and Miller, the conclusion seems inescapable that the light from the cloud is contributed largely by stars. But in appearance the cloud is distinctly dissimilar to our expectation for either young or old stellar systems, and it seems to bear no simple relationship to the numerous features that have heretofore been resolved at other optical, infrared, and radio wavelengths. A determination of the true nature of both the cloud and the nuclear feature through spectroscopic and polarimetric measurements is of the highest priority. C1 UNIV CALIF SANTA CRUZ,LICK OBSERV,BOARD STUDIES ASTRON & ASTROPHYS,SANTA CRUZ,CA 95064. PRINCETON UNIV,DEPT PHYS,PRINCETON,NJ 08544. LOWELL OBSERV,FLAGSTAFF,AZ 86001. UNIV WASHINGTON,DEPT ASTRON,SEATTLE,WA 98105. UNIV MARYLAND,DEPT PHYS & ASTRON,COLLEGE PK,MD 20742. SPACE TELESCOPE SCI INST,BALTIMORE,MD 21218. CALTECH,CTR INFRARED PROC & ANAL,PASADENA,CA 91125. CARNEGIE INST WASHINGTON,PASADENA,CA 91101. USN OBSERV,WASHINGTON,DC 20390. CALTECH,DIV GEOL & PLANETARY SCI,PASADENA,CA 91125. RP LYNDS, R (reprint author), NATL OPT ASTRON OBSERV,KITT PEAK NATL OBSERV,TUCSON,AZ 85726, USA. NR 9 TC 34 Z9 34 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 MAR 10 PY 1991 VL 369 IS 2 BP L31 EP & DI 10.1086/185952 PN 2 PG 0 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA EY641 UT WOS:A1991EY64100003 ER PT J AU WESTPHAL, JA BAUM, WA LAUER, TR DANIELSON, GE CURRIE, DG EWALD, SP FABER, SM GROTH, EJ HESTER, JJ LIGHT, RM LYNDS, R ONEIL, EJ SEIDELMANN, PK SHAYA, EJ SMITH, BA AF WESTPHAL, JA BAUM, WA LAUER, TR DANIELSON, GE CURRIE, DG EWALD, SP FABER, SM GROTH, EJ HESTER, JJ LIGHT, RM LYNDS, R ONEIL, EJ SEIDELMANN, PK SHAYA, EJ SMITH, BA TI HUBBLE SPACE TELESCOPE WIDE-FIELD PLANETARY CAMERA IMAGES OF SATURN SO ASTROPHYSICAL JOURNAL LA English DT Article DE IMAGE PROCESSING; PLANETS, SATURN AB Saturn was recorded in blue, green, and "red" light with the Wide-Field/Planetary Camera aboard the Hubble Space Telescope. Owing to relatively high signal levels over most of the planet's image, a dramatic improvement in the visibility of image detail was achieved by deconvolving the raw images, which had suffered severely from the spherical aberration of the HST optics. The deconvolved images are superior in quality to anything now achievable with ground-based telescopes. On Saturn, the polar hexagon seen by the Voyager spacecraft is still there, but some of the structure of the belts and zones has changed. The B-ring spokes were not visible. C1 UNIV WASHINGTON,DEPT ASTRON,SEATTLE,WA 98105. NATL OPT ASTRON OBSERV,TUCSON,AZ 85726. UNIV MARYLAND,DEPT PHYS & ASTRON,COLLEGE PK,MD 20742. SPACE TELESCOPE SCI INST,BALTIMORE,MD 21218. UNIV CALIF SANTA CRUZ,LICK OBSERV,BOARD STUDIES ASTRON & ASTROPHYS,SANTA CRUZ,CA 95064. PRINCETON UNIV,DEPT PHYS,PRINCETON,NJ 08544. CALTECH,CTR INFRARED PROC & ANAL,PASADENA,CA 91125. USN OBSERV,WASHINGTON,DC 20390. UNIV HAWAII,INST ASTRON,HONOLULU,HI 96822. RP WESTPHAL, JA (reprint author), CALTECH,DIV GEOL & PLANETARY SCI,PASADENA,CA 91125, USA. NR 8 TC 12 Z9 12 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 MAR 10 PY 1991 VL 369 IS 2 BP L51 EP & DI 10.1086/185956 PN 2 PG 0 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA EY641 UT WOS:A1991EY64100007 ER PT J AU MOND, JJ FEUERSTEIN, N JUNE, CH BALAPURE, AK GLAZER, RI WITHERSPOON, K BRUNSWICK, M AF MOND, JJ FEUERSTEIN, N JUNE, CH BALAPURE, AK GLAZER, RI WITHERSPOON, K BRUNSWICK, M TI BIMODAL EFFECT OF PHORBOL ESTER ON B-CELL ACTIVATION - IMPLICATION FOR THE ROLE OF PROTEIN-KINASE-C SO JOURNAL OF BIOLOGICAL CHEMISTRY LA English DT Article ID MYRISTATE ACETATE; MEMBRANE IMMUNOGLOBULIN; RESPIRATORY BURST; ANTI-IMMUNOGLOBULIN; PLASMA-MEMBRANE; LYMPHOMA CELLS; LYMPHOCYTES-B; TRANSLOCATION; PHOSPHORYLATION; PROLIFERATION AB The role of protein kinase C PKC in B cell activation is controversial. These studies were undertaken to determine whether protein kinase C has a stimulatory or inhibitory role in B cell activation. We found that treatment of B cells for a short period of time (30 min) with the PKC activator phorbol 12,13-dibutyrate (PDBU) primed the cells for enhanced proliferative responses to anti-immunoglobulin (anti-Ig) antibody whereas treatment for a longer period of time (3 h or more) resulted in suppression of proliferation. The enhanced proliferative response to treatment of B cells with PDBU for short periods of time was associated with inhibition of anti-Ig-stimulated increases in phosphatidyl 4,5-bisphosphate (PIP2) hydrolysis and inhibition of increases in [Ca2+]i, indicating that activation of PKC per se might be sufficient for enhancing B cell activation. The time-dependent effect of phorbol esters on the inhibition of B cell proliferation was found to be closely correlated with the kinetics of disappearance of PKC as measured by Western blot and by enzymatic activity but not with inhibition of [Ca2+]i and PIP2. These data demonstrate a bimodal time-dependent effect of PDBU on B cell activation and suggest that (a) the inhibitory effect of phorbol ester on anti-Ig-induced proliferation may be due to the disappearance of PKC rather than to the inhibition of PIP2 and Ca2+; and (b) the early activation of PKC is a stimulatory rather than an inhibitory signal in the induction of B lymphocyte proliferation by anti-Ig. C1 USN,MED RES INST,MED COMMAND,BETHESDA,MD 20814. GEORGETOWN UNIV,ROCKVILLE,MD 20850. RP MOND, JJ (reprint author), UNIFORMED SERV UNIV HLTH SCI,DEPT MED,BETHESDA,MD 20814, USA. FU NCI NIH HHS [CA48667-03]; NIAID NIH HHS [R01 AI24273, R01 AI27465] NR 42 TC 19 Z9 19 U1 0 U2 0 PU AMER SOC BIOCHEMISTRY MOLECULAR BIOLOGY INC PI BETHESDA PA 9650 ROCKVILLE PIKE, BETHESDA, MD 20814 SN 0021-9258 J9 J BIOL CHEM JI J. Biol. Chem. PD MAR 5 PY 1991 VL 266 IS 7 BP 4458 EP 4463 PG 6 WC Biochemistry & Molecular Biology SC Biochemistry & Molecular Biology GA FA694 UT WOS:A1991FA69400068 PM 1847921 ER PT J AU ANASTASSOPOULOS, DL PRIFTIS, GD PAPANICOLAOU, NI BACALIS, NC PAPACONSTANTOPOULOS, DA AF ANASTASSOPOULOS, DL PRIFTIS, GD PAPANICOLAOU, NI BACALIS, NC PAPACONSTANTOPOULOS, DA TI CALCULATION OF THE ELECTRON MOMENTUM DENSITY AND COMPTON-SCATTERING MEASUREMENTS FOR NICKEL SO JOURNAL OF PHYSICS-CONDENSED MATTER LA English DT Article ID PROFILE MEASUREMENTS; COPPER METAL; DISTRIBUTIONS; RADIATION AB The [100], [110] and [111] directional Compton profiles of single crystals of nickel have been measured using 59.54 keV Am-241 gamma-rays at a 170-degrees scattering angle and a well defined scattering vector. The electron momentum distribution and Compton profiles in nickel have also been calculated on the basis of a self-consistent augmented-plane-wave method within the local-density approximation including a correlation correction term. A quantitative comparison between experimental and theoretical directional Compton profiles shows good agreement and reveals some accurate information about the Fermi surface. Excitations due to non-local correlation effects from contributing parts to non-contributing parts of the energy bands are very clearly seen along the [100], [110] and [111] directions. The calculation also reproduces quite well the main features of the observed anisotropies, typically within the experimental error margins, although it slightly overestimates their magnitude. C1 NATL HELLENIC RES FDN, INST THEORET & PHYS CHEM, GR-11635 ATHENS, GREECE. UNIV IOANNINA, DEPT PHYS, GR-45110 IOANNINA, GREECE. USN, RES LAB, WASHINGTON, DC 20375 USA. RP ANASTASSOPOULOS, DL (reprint author), UNIV PATRAS, DEPT PHYS, GR-26110 PATRAS, GREECE. RI Bacalis, Naoum/G-5327-2013 OI Bacalis, Naoum/0000-0002-9565-0414 NR 34 TC 9 Z9 9 U1 1 U2 2 PU IOP PUBLISHING LTD PI BRISTOL PA TEMPLE CIRCUS, TEMPLE WAY, BRISTOL BS1 6BE, ENGLAND SN 0953-8984 EI 1361-648X J9 J PHYS-CONDENS MAT JI J. Phys.-Condes. Matter PD MAR 4 PY 1991 VL 3 IS 9 BP 1099 EP 1111 DI 10.1088/0953-8984/3/9/007 PG 13 WC Physics, Condensed Matter SC Physics GA FB076 UT WOS:A1991FB07600007 ER PT J AU PLAZEK, DJ NGAI, KL AF PLAZEK, DJ NGAI, KL TI CORRELATION OF POLYMER SEGMENTAL CHAIN DYNAMICS WITH TEMPERATURE-DEPENDENT TIME-SCALE SHIFTS SO MACROMOLECULES LA English DT Note ID MOLECULAR WEIGHT POLYSTYRENE; LINEAR AMORPHOUS POLYMERS; VISCOELASTIC BEHAVIOR; QUANTITATIVE EXPLANATION; TERMINAL DISPERSIONS; GLASS TEMPERATURE; LIGHT-SCATTERING; RELAXATION; POLYPROPYLENE; DIFFERENCE C1 USN,RES LAB,WASHINGTON,DC 20375. RP PLAZEK, DJ (reprint author), UNIV PITTSBURGH,DEPT MAT SCI & ENGN,PITTSBURGH,PA 15261, USA. NR 42 TC 450 Z9 450 U1 2 U2 41 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0024-9297 J9 MACROMOLECULES JI Macromolecules PD MAR 4 PY 1991 VL 24 IS 5 BP 1222 EP 1224 DI 10.1021/ma00005a044 PG 3 WC Polymer Science SC Polymer Science GA FA473 UT WOS:A1991FA47300044 ER PT J AU LOWRIE, A MICHAEL, M AF LOWRIE, A MICHAEL, M TI CLATHRATES (GAS HYDRATES) IN DEEP-SEA AS NEXT GLOBAL HYDROCARBON PROVINCE SO AAPG BULLETIN-AMERICAN ASSOCIATION OF PETROLEUM GEOLOGISTS LA English DT Meeting Abstract C1 USN,RES LAB,WASHINGTON,DC 20375. NR 0 TC 0 Z9 0 U1 1 U2 1 PU AMER ASSN PETROL GEOLOGISTS PI TULSA PA 1444 S BOULDER AVE PO BOX 979, TULSA, OK 74101 SN 0149-1423 J9 AAPG BULL JI AAPG Bull.-Am. Assoc. Petr. Geol. PD MAR PY 1991 VL 75 IS 3 BP 625 EP 625 PG 1 WC Energy & Fuels; Engineering, Petroleum; Geosciences, Multidisciplinary SC Energy & Fuels; Engineering; Geology GA FA437 UT WOS:A1991FA43700416 ER PT J AU VANDERMEER, RA MASUMURA, RA RATH, BB AF VANDERMEER, RA MASUMURA, RA RATH, BB TI MICROSTRUCTURAL PATHS OF SHAPE-PRESERVED NUCLEATION AND GROWTH TRANSFORMATIONS SO ACTA METALLURGICA ET MATERIALIA LA English DT Article ID COMPUTER-SIMULATION; RECRYSTALLIZATION MICROSTRUCTURES; KINETICS AB The concept of microstructural path is developed for a wide range of solid state nucleation and growth transformations including recrystallization. A new analytical expression relating the stereological properties, S(v) and X(v), is derived for the microstructural path function for randomly-nucleated, shape-preserved nucleation and growth transformations. Experiments based on computer simulations of the geometric aspects of these transformations have confirmed the validity of the theoretical development. When microstructural data from a study of recrystallization of cold-worked iron are examined in the light of the newly derived path function, excellent agreement is achieved. RP VANDERMEER, RA (reprint author), USN, RES LAB, WASHINGTON, DC 20375 USA. NR 12 TC 57 Z9 60 U1 1 U2 3 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLAND SN 0956-7151 J9 ACTA METALL MATER JI Acta Metall. Mater. PD MAR PY 1991 VL 39 IS 3 BP 383 EP 389 DI 10.1016/0956-7151(91)90317-T PG 7 WC Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Materials Science; Metallurgy & Metallurgical Engineering GA EX976 UT WOS:A1991EX97600014 ER PT J AU BARLAT, F VASUDEVAN, AK AF BARLAT, F VASUDEVAN, AK TI INFLUENCE OF PRECIPITATE MICROSTRUCTURE ON FLOW AND FORMING PROPERTIES OF AN ALUMINUM-ALLOY SHEET SO ACTA METALLURGICA ET MATERIALIA LA English DT Article ID PLASTIC ANISOTROPY; YIELD SURFACES; BEHAVIOR; METALS; STRETCHABILITY; DEFORMATION; FORMABILITY; FAILURE AB A 7075 aluminium alloy sheet was cold rolled, solution heat treated and artificially aged to underaged (UA) and overaged (OA) conditions. A careful fabrication and heat treatment procedure was followed in order to obtain UA and OA sheets having the same isotropic crystallographic texture and uniaxial yield strength. Hydraulic bulge tests, plane strain, and uniaxial tension tests were performed to characterize the mechanical behavior of these materials. The forming limit diagram (FLD) was also obtained for these two conditions. Transmission electron microscopy (TEM) and scanning electron microscopy (SEM) were used to characterize the precipitate microstructure, slip line patterns and fracture surfaces. Experimental observations showed that both macroscopic and microscopic responses of the materials to plastic deformation was strongly affected by the precipitate microstructure. FLDs were theoretically computed with the Marciniak and Kuczynski (MK) analysis, using the yield locus calculated with the Taylor/Bishop and Hill (TBH) theory for polycrystalline plasticity and the stress-strain curve corresponding to both UA and OA conditions. The predicted results were in good agreement with experiments for sheet in the OA condition, and they were not for the material in the UA condition. This was explained in terms of yield surface shape, consistent with the slip line characteristics, though differences in fracture behavior may contribute to these observations. The yield surface shape effect was emphasized since it provides, besides fracture, an alternate interpretation of failure mechanism near balanced biaxial tension, and since it can be described fairly well with a simple phenomenological description of plastic behavior. C1 APPL RES & TECHNOL DIRECTORATE, OFF NAVAL RES, ARLINGTON, VA 22217 USA. RP BARLAT, F (reprint author), ALCOA LABS, ALCOA CTR, PA 15069 USA. OI Barlat, Frederic/0000-0002-4463-3454 NR 28 TC 22 Z9 22 U1 2 U2 11 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLAND SN 0956-7151 J9 ACTA METALL MATER JI Acta Metall. Mater. PD MAR PY 1991 VL 39 IS 3 BP 391 EP 400 DI 10.1016/0956-7151(91)90318-U PG 10 WC Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Materials Science; Metallurgy & Metallurgical Engineering GA EX976 UT WOS:A1991EX97600015 ER PT J AU CUNNINGHAM, DS FULGHAM, DL RAYL, DL HANSEN, KA ALEXANDER, NJ AF CUNNINGHAM, DS FULGHAM, DL RAYL, DL HANSEN, KA ALEXANDER, NJ TI ANTISPERM ANTIBODIES TO SPERM SURFACE-ANTIGENS IN WOMEN WITH GENITAL-TRACT INFECTION SO AMERICAN JOURNAL OF OBSTETRICS AND GYNECOLOGY LA English DT Article DE ANTISPERM ANTIBODIES; GENITAL TRACT INFECTION; WESTERN BLOT ANALYSIS; SPERM SURFACE ANTIGENS; INFERTILITY ID INFERTILITY AB Antisperm antibodies to sperm surface antigens in nulligravid women with primary upper genital tract infections were measured by the sperm mixed agglutination reaction assay. As many as 56% of women with a primary episode of pelvic inflammatory disease had antisperm antibodies. In addition, 69% of those women with no history of genital tract infection but with laparoscopic evidence of past pelvic infection had significant levels of circulating antisperm antibodies. Electroimmunoblots of sperm preparations probed with the sera of women who had either known or presumed upper genital tract infection revealed a uniformly recognized 69 kd antigen. In contrast, women with circulating antisperm antibodies before primary upper genital tract infection recognized up to five distinct sperm antigen determinants of 27, 54, 131, 146, and 174 kd. It is a distinct possibility that genital tract infections may lead to immunopotentiation of antisperm antibodies that could affect fertility. C1 EASTERN VIRGINIA MED SCH,JONES INST REPROD MED,NORFOLK,VA 23501. RP CUNNINGHAM, DS (reprint author), USN HOSP,DEPT OBSTET & GYNECOL,PORTSMOUTH,VA 23708, USA. NR 14 TC 46 Z9 47 U1 1 U2 1 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 MAR PY 1991 VL 164 IS 3 BP 791 EP 796 PG 6 WC Obstetrics & Gynecology SC Obstetrics & Gynecology GA FC256 UT WOS:A1991FC25600016 PM 2003543 ER PT J AU SOUTHARD, TE SOUTHARD, KA WEEDA, LW AF SOUTHARD, TE SOUTHARD, KA WEEDA, LW TI MESIAL FORCE FROM UNERUPTED 3RD MOLARS SO AMERICAN JOURNAL OF ORTHODONTICS AND DENTOFACIAL ORTHOPEDICS LA English DT Article AB Erupting mandibular third molars are implicated as a cause of anterior crowding of mandibular teeth. The goal of this two-part investigation was to measure the mesial force exerted by unerupted mandibular third molars. We hypothesized that such a force increases the tightness of all proximal posterior tooth contacts mesial to the mandibular second molar, and that surgical removal of third molars relieves the tightness by eliminating this force. The contact tightness between mandibular posterior teeth was measured bilaterally in 20 patients with bilateral unerupted mandibular third molars, immediately before and after unilateral removal of a third molar. We found unexpectedly that mean proximal tightness decreased bilaterally in all contacts that were measured after unilateral removal of a third molar, and we did not detect a mesial force exerted by unerupted third molars. We suspected that this bilateral relief of contact tightness resulted from placing the patients in a supine position for surgery. The second part of the experiment was conducted to determine the effects of postural change on proximal contact tightness where no surgery had been performed. For ten subjects we discovered a mean decrease in the tightness of all mandibular posterior contacts 2 hours after the patient had been moved from an upright to a supine position. The greatest mean decrease (-32%, p < 0.0001) was found at the most posterior tooth contact. We conclude that surgical removal of unerupted mandibular third molars does not significantly reduce proximal contact tightness, but that simple movement from an upright to a supine position relieves such tightness dramatically. The effects of posture overwhelm any effects from erupting third molars on interdental forces. There are many valid reasons for removing unerupted mandibular third molars. However, the results of this study indicate that removing these teeth for the exclusive purpose of relieving interdental pressure and thereby preventing mandibular incisor crowding appears to be unwarranted. C1 USN,DENT CORPS NAVAL DENT CLIN,CHARLESTON,SC 29408. RP SOUTHARD, TE (reprint author), UNIV IOWA,COLL DENT,DEPT ORTHODONT,IOWA CITY,IA 52242, USA. NR 18 TC 22 Z9 24 U1 0 U2 4 PU MOSBY-YEAR BOOK INC PI ST LOUIS PA 11830 WESTLINE INDUSTRIAL DR, ST LOUIS, MO 63146-3318 SN 0889-5406 J9 AM J ORTHOD DENTOFAC JI Am. J. Orthod. Dentofac. Orthop. PD MAR PY 1991 VL 99 IS 3 BP 220 EP 225 DI 10.1016/0889-5406(91)70004-G PG 6 WC Dentistry, Oral Surgery & Medicine SC Dentistry, Oral Surgery & Medicine GA FB612 UT WOS:A1991FB61200008 PM 1998299 ER PT J AU VANLIESHOUT, L DEJONGE, N BASSILY, S MANSOUR, MM DEELDER, AM AF VANLIESHOUT, L DEJONGE, N BASSILY, S MANSOUR, MM DEELDER, AM TI ASSESSMENT OF CURE IN SCHISTOSOMIASIS PATIENTS AFTER CHEMOTHERAPY WITH PRAZIQUANTEL BY QUANTITATION OF CIRCULATING ANODIC ANTIGEN (CAA) IN URINE SO AMERICAN JOURNAL OF TROPICAL MEDICINE AND HYGIENE LA English DT Article ID POLYSACCHARIDE ANTIGENS; ULTRASTRUCTURAL-LOCALIZATION; IMMUNOLOGICAL RESPONSE; MONOCLONAL-ANTIBODIES; MANSONI; SERUM; INFECTION; HAEMATOBIUM; PRECIPITATION; INTENSITY AB The kinetics of circulating anodic antigen (CAA) levels in urine were studied in Egyptian male patients infected with Schistosoma mansoni or with both S. mansoni and S. haematobium, before treatment, and at one, three and six weeks after chemotherapy. A quantitative enzyme-linked immunosorbent assay (ELISA) demonstrated CAA in 82% of the serum and 89% of the urine samples from these 28 patients. To evaluate the possibility of circadian variability in urine CAA levels, samples were examined in 15 patients at four intervals during a 24-hour period. No significant differences in CAA titers were observed. Seventeen patients were subsequently treated with praziquantel and followed for six weeks. CAA titers in serum and urine decreased significantly one week after therapy. Thereafter, the profile of CAA titer in urine continued to show a parallel but delayed decline compared to that in serum. While all serum CAA titers became negative three to six weeks after treatment, urine titers were negative in 47% at three weeks and 69% at six weeks. The remaining positive patients had low titers. A significant quantitative correlation in CAA titer was found between serum and urine before and after treatment. Seventeen Egyptian control subjects with no active schistosome infection were negative for CAA in both serum and urine. Our results confirm that the CAA urine assay could be used as a sensitive and non-invasive method to diagnose the disease, and indicate that the assay can be used to monitor efficacy of schistosome chemotherapy. C1 UNIV LEIDEN,FAC MED,PARASITOL LAB,2300 RC LEIDEN,NETHERLANDS. RP VANLIESHOUT, L (reprint author), USN,MED RES UNIT 3,FPO,NEW YORK,NY 09527, USA. RI de Jonge, Niels/A-1786-2012 NR 27 TC 38 Z9 38 U1 0 U2 0 PU AMER SOC TROP MED & HYGIENE PI MCLEAN PA 8000 WESTPARK DRIVE SUITE 130, MCLEAN, VA 22101 SN 0002-9637 J9 AM J TROP MED HYG JI Am. J. Trop. Med. Hyg. PD MAR PY 1991 VL 44 IS 3 BP 323 EP 328 PG 6 WC Public, Environmental & Occupational Health; Tropical Medicine SC Public, Environmental & Occupational Health; Tropical Medicine GA FN791 UT WOS:A1991FN79100012 PM 1903605 ER PT J AU BREDEHORST, R WEMHOFF, GA KUSTERBECK, AW CHARLES, PT THOMPSON, RB LIGLER, FS VOGEL, CW AF BREDEHORST, R WEMHOFF, GA KUSTERBECK, AW CHARLES, PT THOMPSON, RB LIGLER, FS VOGEL, CW TI NOVEL TRIFUNCTIONAL CARRIER MOLECULE FOR THE FLUORESCENT LABELING OF HAPTENS SO ANALYTICAL BIOCHEMISTRY LA English DT Article ID VARIABLE-FREQUENCY PHASE; ANTIBODY-AFFINITY; MODULATION DATA; ASSAY; FLUOROIMMUNOASSAY; IMMUNOASSAY C1 USN,RES LAB,CTR BIOMOLEC SCI & ENGN,CODE 6090,WASHINGTON,DC 20375. GEORGETOWN UNIV,DEPT BIOCHEM & MOLEC BIOL,WASHINGTON,DC 20007. FU NCI NIH HHS [CA 01039] NR 26 TC 11 Z9 11 U1 1 U2 3 PU ACADEMIC PRESS INC JNL-COMP SUBSCRIPTIONS PI SAN DIEGO PA 525 B ST, STE 1900, SAN DIEGO, CA 92101-4495 SN 0003-2697 J9 ANAL BIOCHEM JI Anal. Biochem. PD MAR PY 1991 VL 193 IS 2 BP 272 EP 279 DI 10.1016/0003-2697(91)90021-K PG 8 WC Biochemical Research Methods; Biochemistry & Molecular Biology; Chemistry, Analytical SC Biochemistry & Molecular Biology; Chemistry GA FB610 UT WOS:A1991FB61000021 PM 1908196 ER PT J AU BELLAMA, JM BRINCKMAN, F CRAIG, P PELLENBARG, R AF BELLAMA, JM BRINCKMAN, F CRAIG, P PELLENBARG, R TI GROUP-IV ENVIRONMENTAL CHEMISTRY - STATUS AND TRENDS SO APPLIED ORGANOMETALLIC CHEMISTRY LA English DT Editorial Material C1 USN,RES LAB,TECHNOL CTR SAFETY & SURVIVABIL,DIV CHEM,WASHINGTON,DC 20375. UNIV MARYLAND,DEPT CHEM & BIOCHEM,COLLEGE PK,MD 20742. NR 0 TC 0 Z9 0 U1 0 U2 0 PU JOHN WILEY & SONS LTD PI W SUSSEX PA BAFFINS LANE CHICHESTER, W SUSSEX, ENGLAND PO19 1UD SN 0268-2605 J9 APPL ORGANOMET CHEM JI Appl. Organomet. Chem. PD MAR-APR PY 1991 VL 5 IS 2 BP 69 EP 70 PG 2 WC Chemistry, Applied; Chemistry, Inorganic & Nuclear SC Chemistry GA FL386 UT WOS:A1991FL38600002 ER PT J AU PELLENBARG, RE CARHART, HW AF PELLENBARG, RE CARHART, HW TI SEDIMENTARY SILOXANES - A DEPOSITIONAL HISTORY SO APPLIED ORGANOMETALLIC CHEMISTRY LA English DT Article DE SILOXANES (SILICONES); PB-210; INDUCTIVELY COUPLED PLASMA SPECTROPHOTOMETER; ENVIRONMENT; SEDIMENT DEPOSITION AB A Puget Sound sediment core has been quantitatively analyzed for organic silicon content, as derived from post-1945 release of poly(organo)-siloxanes (silicones). The sedimentary silicone data record and preserve at depth, a smeared event horizon, or first appearance of silicone in the sediment column. Core samples older than 50 years showed no detectable silicone as measured by a new procedure utilizing inductively coupled plasma (ICP) emission spectroscopy after solvent extraction to collect the silicone from gram-sized sediment core samples. C1 USN,RES LAB,TECHNOL CTR SAFETY & SURVIVABIL,DIV CHEM,WASHINGTON,DC 20375. NR 5 TC 2 Z9 2 U1 0 U2 0 PU JOHN WILEY & SONS LTD PI W SUSSEX PA BAFFINS LANE CHICHESTER, W SUSSEX, ENGLAND PO19 1UD SN 0268-2605 J9 APPL ORGANOMET CHEM JI Appl. Organomet. Chem. PD MAR-APR PY 1991 VL 5 IS 2 BP 79 EP 82 DI 10.1002/aoc.590050203 PG 4 WC Chemistry, Applied; Chemistry, Inorganic & Nuclear SC Chemistry GA FL386 UT WOS:A1991FL38600004 ER PT J AU BELLAMA, JM MEYER, SR PELLENBARG, RE AF BELLAMA, JM MEYER, SR PELLENBARG, RE TI DETECTION OF ENVIRONMENTAL POLYORGANOSILOXANES (SILICONES) BY SI-29 NMR-SPECTROSCOPY SO APPLIED ORGANOMETALLIC CHEMISTRY LA English DT Note DE POLYORGANOSILOXANES; SI-29 NMR; POLYDIMETHYLSILOXANES; SEDIMENTS ID SPIN-LATTICE RELAXATION; SEDIMENTS AB The utility of Si-29 NMR spectroscopy has been demonstrated on sediment-like materials in the quantitative and qualitative determination of polyorganosiloxanes (silicones) in selected environmental samples. This technique is highly selective for polydimethylsiloxanes (PDMS) and is non-destructive to the sample. Also, specific identification of polyorganosiloxanes in sediment is possible, in contrast to previous methods which provided only quantitative information while consuming the sample. The detection limit for a 9 h experiment is approximately 45 ppm. C1 UNIV MARYLAND,DEPT CHEM & BIOCHEM,COLLEGE PK,MD 20742. USN,RES LAB,DIV CHEM,WASHINGTON,DC 20375. NR 11 TC 2 Z9 2 U1 0 U2 1 PU JOHN WILEY & SONS LTD PI W SUSSEX PA BAFFINS LANE CHICHESTER, W SUSSEX, ENGLAND PO19 1UD SN 0268-2605 J9 APPL ORGANOMET CHEM JI Appl. Organomet. Chem. PD MAR-APR PY 1991 VL 5 IS 2 BP 107 EP 109 DI 10.1002/aoc.590050207 PG 3 WC Chemistry, Applied; Chemistry, Inorganic & Nuclear SC Chemistry GA FL386 UT WOS:A1991FL38600008 ER PT J AU HARRINGTON, RS AF HARRINGTON, RS TI SOME ASPECTS OF MULTIPLE-STAR EPHEMERIS COMPUTATION SO ASTRONOMICAL JOURNAL LA English DT Article AB For ultraprecise multiple-star ephemeris computation, these systems cannot be considered as stationary multi-two-body systems. For nearby, high-motion systems, the change in perspective must be considered. For close triples, the three-body perturbations must be considered. In any case, it is desirable now for orbit computers and catalogers to start including a weighted mean epoch as part of the reported orbital parameters. RP HARRINGTON, RS (reprint author), USN OBSERV,WASHINGTON,DC 20392, USA. NR 6 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 0004-6256 J9 ASTRON J JI Astron. J. PD MAR PY 1991 VL 101 IS 3 BP 1063 EP 1064 DI 10.1086/115748 PG 2 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA EY997 UT WOS:A1991EY99700028 ER PT J AU WOOD, KS NEMIROFF, RJ AF WOOD, KS NEMIROFF, RJ TI CONSTRAINTS ON WEYL GRAVITY ON SUBGALACTIC DISTANCE SCALES SO ASTROPHYSICAL JOURNAL LA English DT Article DE GRAVITATION ID INVERSE-SQUARE LAW; ROTATION CURVES; EARTH AB The Weyl theory of gravity presented by Mannheim & Kazanas is investigated with regard to existing experiments and observations. The point mass solution is used to derive expressions for departures from Newtonian gravity that can be compared with the threshold of detectability on various sub-Galactic scales, including both solar system and laboratory tests. If the free parameter-gamma is a constant, marginal compatibility with constraints on DELTA(GM)/(GM) can be achieved by adjusting-gamma. At a mass scale of kilograms and a distance scale of centimeters, published laboratory results appear to exclude a universal-gamma equal to the reciprocal of the Hubble radius at the current epoch. Possible recourses are described, as well as potential problems on extra-galactic scales. RP WOOD, KS (reprint author), USN,RES LAB,EO HULBURT CTR SPACE RES,CODE 4121,4555 OVERLOOK AVE SW,WASHINGTON,DC 20375, USA. NR 16 TC 3 Z9 3 U1 0 U2 0 PU UNIV CHICAGO PRESS PI CHICAGO PA 5720 S WOODLAWN AVE, CHICAGO, IL 60637 SN 0004-637X J9 ASTROPHYS J JI Astrophys. J. PD MAR 1 PY 1991 VL 369 IS 1 BP 54 EP 56 DI 10.1086/169738 PN 1 PG 3 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA EX523 UT WOS:A1991EX52300007 ER PT J AU FELDMAN, U DOSCHEK, GA AF FELDMAN, U DOSCHEK, GA TI THE SOLAR SPECTRUM BETWEEN 914-A AND 1177-A SO ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES LA English DT Article DE LINE IDENTIFICATIONS; SUN, SPECTRA; ULTRAVIOLET, SPECTRA ID EMISSION-LINE RATIOS; B-LIKE IONS; TRANSITION ZONE; FORBIDDEN TRANSITIONS; XUV SPECTRA; S-IV; O-IV; DIAGNOSTICS; BERYLLIUM; SEQUENCE AB We present a spectral line list with wavelengths and identifications for the 914-1177 angstrom region. The list is based on a Naval Research Laboratory (NRL) solar spectrum obtained from a rocket flight in 1966 and on spectra recorded by the NRL S082-B slit spectrograph flown in 1973 on the Skylab manned space station as part of the Apollo Telescope Mount. Three Skylab spectra were used for this work: a limb spectrum recorded at a position of 2" outside the white-light limb, and two flare spectra. The wavelength list should be useful in analyzing some spectra to be obtained from the planned National Aeronautics and Space Administration Lyman Far Ultraviolet Spectroscopic Explorer mission. We also present a separate table listing observed or predicted forbidden lines that fall in the 914-1177 angstrom range, and we discuss some of the plasma diagnostic possibilities for spectral lines in this range. RP FELDMAN, U (reprint author), USN,RES LAB,EO HULBURT CTR SPACE RES,CODE 4174,WASHINGTON,DC 20375, USA. NR 40 TC 30 Z9 30 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 MAR PY 1991 VL 75 IS 3 BP 925 EP 934 DI 10.1086/191554 PG 10 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA EZ328 UT WOS:A1991EZ32800010 ER PT J AU HUGHES, J POLOJENTSEV, DD SMITH, C YAGUDIN, LI AF HUGHES, J POLOJENTSEV, DD SMITH, C YAGUDIN, LI TI REPORT OF THE SRS COMMITTEE ON THE COMPILATION OF THE SRS CATALOG SO ASTROPHYSICS AND SPACE SCIENCE LA English DT Article; Proceedings Paper CT 100TH COLLOQUIUM OF THE INTERNATIONAL ASTRONOMICAL UNION - GEORGE TELEKI MEMORIAL COLLOQUIUM ON FUNDAMENTALS OF ASTROMETRY CY SEP 08-11, 1987 CL BELGRAD, YUGOSLAVIA SP INT ASTRON UNION ID APPARENT PLACE COMPUTATIONS; IAU SYSTEM; PROPER MOTIONS; POSITIONS; J2000.0; TRANSFORMATION; CONVERSION; B1950.0; PROGRAM AB The status of the collaboration between the Pulkovo Observatory and the U.S. Naval Observatory (USNO) on the compilation of the Southern Reference Star (SRS) catalog is described. Results of comparisons between the data bases and the preliminary compiled SRS catalogs of the two observatories are discussed. Characteristics of the jointly compiled catalog are given. C1 ACAD SCI USSR,MAIN ASTRON OBSERV,LENINGRAD 196140,USSR. RP HUGHES, J (reprint author), USN OBSERV,WASHINGTON,DC 20392, USA. NR 8 TC 0 Z9 0 U1 0 U2 0 PU KLUWER ACADEMIC PUBL PI DORDRECHT PA SPUIBOULEVARD 50, PO BOX 17, 3300 AA DORDRECHT, NETHERLANDS SN 0004-640X J9 ASTROPHYS SPACE SCI JI Astrophys. Space Sci. PD MAR PY 1991 VL 177 IS 1-2 BP 17 EP 20 DI 10.1007/BF00643646 PG 4 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA FU440 UT WOS:A1991FU44000004 ER PT J AU HUGHES, JA KAPLAN, GH SHAO, M AF HUGHES, JA KAPLAN, GH SHAO, M TI DESIGN CONSIDERATIONS FOR THE USNO ASTROMETRIC OPTICAL INTERFEROMETER SO ASTROPHYSICS AND SPACE SCIENCE LA English DT Article; Proceedings Paper CT 100TH COLLOQUIUM OF THE INTERNATIONAL ASTRONOMICAL UNION - GEORGE TELEKI MEMORIAL COLLOQUIUM ON FUNDAMENTALS OF ASTROMETRY CY SEP 08-11, 1987 CL BELGRAD, YUGOSLAVIA SP INT ASTRON UNION AB The USNO will undertake the construction and operation of a phase coherent, astrometric, optical interferometer which will be dedicated to the determination of stellar positions and motions. Building upon the experience gained from the MARK III Interferometer at Mount Wilson, the USNO instrument is currently in the very early stages of conceptualization and initial design. An abbreviated account of the experience gained with the MARK III is given. Examples of the issues and possibilities to be addressed in designing the new USNO instrument are outlined. Some background discussion involving interferometric techniques is included. C1 HARVARD SMITHSONIAN CTR ASTROPHYS,CAMBRIDGE,MA 02138. RP HUGHES, JA (reprint author), USN OBSERV,WASHINGTON,DC 20390, USA. NR 3 TC 0 Z9 0 U1 1 U2 2 PU KLUWER ACADEMIC PUBL PI DORDRECHT PA SPUIBOULEVARD 50, PO BOX 17, 3300 AA DORDRECHT, NETHERLANDS SN 0004-640X J9 ASTROPHYS SPACE SCI JI Astrophys. Space Sci. PD MAR PY 1991 VL 177 IS 1-2 BP 151 EP 159 DI 10.1007/BF00643668 PG 9 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA FU440 UT WOS:A1991FU44000026 ER PT J AU YAO, ZG SMITH, C AF YAO, ZG SMITH, C TI THE EFFECT OF VARIOUS SOLAR EPHEMERIDES ON EQUATOR AND EQUINOX SOLUTIONS FROM OBSERVATIONS OF THE SUN WITH THE REVERSIBLE TRANSIT CIRCLE AT CAPE-OBSERVATORY FROM 1907 TO 1959 SO ASTROPHYSICS AND SPACE SCIENCE LA English DT Article; Proceedings Paper CT 100TH COLLOQUIUM OF THE INTERNATIONAL ASTRONOMICAL UNION - GEORGE TELEKI MEMORIAL COLLOQUIUM ON FUNDAMENTALS OF ASTROMETRY CY SEP 08-11, 1987 CL BELGRAD, YUGOSLAVIA SP INT ASTRON UNION AB Observations of the Sun were made with the Cape reversible transit circle from 1907 to 1959. We have made least squares solutions for six unknowns viz., equator and equinox corrections and corrections to earth orbital parameters including the ephemeris mean longitude of the Sun, the mean obliquity of the ecliptic, the mean longitude of perihelion, and the mean eccentricity of the earth's orbit based on Newcomb's, DE102, and DE200 Ephemerides for each of six catalogs of observations made during that period. The six unknowns are also determined simultaneously for the six catalogs taken together. The six catalogs are absolute, in that methods of observation and reduction were adopted in such a way as to produce a system of results not closely dependent on the adopted system of assumed clock and azimuth star positions. The observed equator and equinox corrections from a comparison of DE200 with the Cape Sun observations referred to an improved FK4 system are -0.07 +/- 0.01 arcsec and -0.20 +/- 0.04 arcsec, respectively, at the mean epoch of observation, 1933.02. The time rate of change of the equator correction was not significant. The time rate of change of the observed equinox is -1.02 +/- 0.30 arcsec per century. The observed equinox correction of the DE102 at 1933.02 is -0.41 +/- 0.04 arcsec, which is 0.5 arcsec less than the NEWCOMB(Herget) equinox correction. This confirms the result based on Washington Sun observations. RP YAO, ZG (reprint author), USN OBSERV,WASHINGTON,DC 20392, USA. NR 6 TC 4 Z9 4 U1 0 U2 0 PU KLUWER ACADEMIC PUBL PI DORDRECHT PA SPUIBOULEVARD 50, PO BOX 17, 3300 AA DORDRECHT, NETHERLANDS SN 0004-640X J9 ASTROPHYS SPACE SCI JI Astrophys. Space Sci. PD MAR PY 1991 VL 177 IS 1-2 BP 181 EP 186 DI 10.1007/BF00643672 PG 6 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA FU440 UT WOS:A1991FU44000030 ER PT J AU DAHN, CC MONET, DG AF DAHN, CC MONET, DG TI OBSERVATIONAL STATUS OF THE USNO TRIGONOMETRIC PARALLAX PROGRAM SO ASTROPHYSICS AND SPACE SCIENCE LA English DT Article; Proceedings Paper CT 100TH COLLOQUIUM OF THE INTERNATIONAL ASTRONOMICAL UNION - GEORGE TELEKI MEMORIAL COLLOQUIUM ON FUNDAMENTALS OF ASTROMETRY CY SEP 08-11, 1987 CL BELGRAD, YUGOSLAVIA SP INT ASTRON UNION ID ASTROMETRY; STARS AB Since 1983, a TI 800 x 800 CCD has been routinely used on the 1.5-m astrometric reflector during dark time to measure parallaxes of faint (V greater-than-or-equal-to 16.0) stars. The rest of the time remains devoted to the fine grain (Kodak type IIIa emulsions) photographic parallax program, which now uses magnitude compensating filters to extend the range of the program to V = 0. Sufficient data are now available to evaluate the precisions of these programs. For CCD fields, the mean error for the relative parallax ranges from +/- 0."0025 for fields with relatively few observations to +/- 0."0005 for intensively observed fields such as vB10. The photographic program is now producing relative parallaxes with average mean errors of +/- 0."0026 compared to +/- 0."0038 previously obtained with coarse grain emulsions. RP DAHN, CC (reprint author), USN OBSERV,FLAGSTAFF STN,FLAGSTAFF,AZ 86002, USA. NR 10 TC 0 Z9 0 U1 0 U2 0 PU KLUWER ACADEMIC PUBL PI DORDRECHT PA SPUIBOULEVARD 50, PO BOX 17, 3300 AA DORDRECHT, NETHERLANDS SN 0004-640X J9 ASTROPHYS SPACE SCI JI Astrophys. Space Sci. PD MAR PY 1991 VL 177 IS 1-2 BP 193 EP 198 DI 10.1007/BF00643674 PG 6 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA FU440 UT WOS:A1991FU44000032 ER PT J AU DEVEGT, C HUGHES, JA JAUNCEY, D WHITE, G JOHNSTON, KJ RUSSELL, J NICHOLSON, G AF DEVEGT, C HUGHES, JA JAUNCEY, D WHITE, G JOHNSTON, KJ RUSSELL, J NICHOLSON, G TI AN OBSERVATIONAL PROGRAM FOR A UNIFIED OPTICAL-RADIO REFERENCE FRAME SO ASTROPHYSICS AND SPACE SCIENCE LA English DT Article; Proceedings Paper CT 100TH COLLOQUIUM OF THE INTERNATIONAL ASTRONOMICAL UNION - GEORGE TELEKI MEMORIAL COLLOQUIUM ON FUNDAMENTALS OF ASTROMETRY CY SEP 08-11, 1987 CL BELGRAD, YUGOSLAVIA SP INT ASTRON UNION AB An observational pilot program is described which provides a first step towards the construction of an inertial extragalactic reference frame from optical and radio measurements. Candidate objects will be selected from extragalactic compact radio sources which display optical counterparts. Galactic radio stars will be secondary reference objects. The reference frame will be defined by the radio positions of the extragalactic objects. Based on a coordinated effort in both hemispheres, a global homogeneous net of about 400 quasars and 100 radio stars is expected to result from a five year campaign. C1 USN OBSERV,WASHINGTON,DC 20390. CSIRO,SYDNEY,NSW,AUSTRALIA. RADIO ASTRON OBSERV,JOHANNISBURG,SOUTH AFRICA. USN,RES LAB,WASHINGTON,DC 20375. RP DEVEGT, C (reprint author), HAMBURG OBSERV,W-2050 HAMBURG 80,GERMANY. NR 6 TC 0 Z9 0 U1 0 U2 0 PU KLUWER ACADEMIC PUBL PI DORDRECHT PA SPUIBOULEVARD 50, PO BOX 17, 3300 AA DORDRECHT, NETHERLANDS SN 0004-640X J9 ASTROPHYS SPACE SCI JI Astrophys. Space Sci. PD MAR PY 1991 VL 177 IS 1-2 BP 199 EP 202 PG 4 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA FU440 UT WOS:A1991FU44000033 ER PT J AU WORLEY, CE AF WORLEY, CE TI THE VISUAL DOUBLE STAR DATA-BASE SO ASTROPHYSICS AND SPACE SCIENCE LA English DT Article; Proceedings Paper CT 100TH COLLOQUIUM OF THE INTERNATIONAL ASTRONOMICAL UNION - GEORGE TELEKI MEMORIAL COLLOQUIUM ON FUNDAMENTALS OF ASTROMETRY CY SEP 08-11, 1987 CL BELGRAD, YUGOSLAVIA SP INT ASTRON UNION AB Any use of stars for astrometric purposes necessarily involves examination of their duplicity characteristics. The Washington Double Star Catalog (WDS) provides this information in a continuously updated and machine-readable format. This contribution describes the current data base and plans for its future extension. RP WORLEY, CE (reprint author), USN OBSERV,WASHINGTON,DC 20392, USA. NR 5 TC 0 Z9 0 U1 0 U2 0 PU KLUWER ACADEMIC PUBL PI DORDRECHT PA SPUIBOULEVARD 50, PO BOX 17, 3300 AA DORDRECHT, NETHERLANDS SN 0004-640X J9 ASTROPHYS SPACE SCI JI Astrophys. Space Sci. PD MAR PY 1991 VL 177 IS 1-2 BP 371 EP 372 DI 10.1007/BF00643708 PG 2 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA FU440 UT WOS:A1991FU44000066 ER PT J AU KNIGHT, DR SCHLICHTING, C DOUGHERTY, JH MESSIER, AA TAPPAN, DV AF KNIGHT, DR SCHLICHTING, C DOUGHERTY, JH MESSIER, AA TAPPAN, DV TI EFFECT OF HYPOXIA ON PSYCHOMOTOR PERFORMANCE DURING GRADED-EXERCISE SO AVIATION SPACE AND ENVIRONMENTAL MEDICINE LA English DT Article ID ALTITUDE; HUMANS AB We evaluated the combined effects of reduced O2 (12%) and graded ergometer exercise (10, 70, and 140 W) on the performance of a psychomotor task. Six men participated in two test sessions each. Each session began with the baseline data (air) and finished with exposure data (12% or 21%, random, unidentified). The gas mixtures were air (control condition) and 12% O2-balance N2 (12% O2 condition). The psychomotor task score was degraded during the 140 W work rate of the 12% O2 condition (p < 0.05). Reductions of the Sao2 (p < 0.05) at each work rate proved that hypoxia existed during exercise in the 12% O2 condition. The arterial blood gases indicated that respiratory alkalosis was mixed with metabolic acidosis during the hypoxic exercise. The results differ from previously reported findings of an arousal effect of exercise on psychomotor performance and the decrement of task performance at work rates less-than-or-equal-to 50 W. We conclude that hypoxia degraded the performance of the psychomotor task during graded exercise. C1 USN,SUBMARINE MED RES LAB,SUBMARINE BASE,GROTON,CT 06349. NR 20 TC 3 Z9 3 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 MAR PY 1991 VL 62 IS 3 BP 228 EP 232 PG 5 WC Public, Environmental & Occupational Health; Medicine, General & Internal; Sport Sciences SC Public, Environmental & Occupational Health; General & Internal Medicine; Sport Sciences GA EZ171 UT WOS:A1991EZ17100006 PM 2012568 ER PT J AU GUEDRY, FE RUPERT, AH AF GUEDRY, FE RUPERT, AH TI STEADY-STATE AND TRANSIENT G-EXCESS EFFECTS SO AVIATION SPACE AND ENVIRONMENTAL MEDICINE LA English DT Note AB Acceleration forces of flight are associated with a number of spatial orientation illusory effects. This note focuses on two effects, both called the "G-excess effect." A distinction between steady-state and transient G-excess effects is important because prescriptions for preventive management of effects in flight will differ. RP GUEDRY, FE (reprint author), USN,DEPT MED SCI,AEROSP MED RES LAB,NAVAL AIR STN,PENSACOLA,FL 32508, USA. NR 10 TC 7 Z9 7 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 MAR PY 1991 VL 62 IS 3 BP 252 EP 253 PG 2 WC Public, Environmental & Occupational Health; Medicine, General & Internal; Sport Sciences SC Public, Environmental & Occupational Health; General & Internal Medicine; Sport Sciences GA EZ171 UT WOS:A1991EZ17100011 PM 2012573 ER PT J AU DEEG, HJ SPITZER, TR COTTLERFOX, M CAHILL, R PICKLE, LW AF DEEG, HJ SPITZER, TR COTTLERFOX, M CAHILL, R PICKLE, LW TI CONDITIONING-RELATED TOXICITY AND ACUTE GRAFT-VERSUS-HOST DISEASE IN PATIENTS GIVEN METHOTREXATE CYCLOSPORINE PROPHYLAXIS SO BONE MARROW TRANSPLANTATION LA English DT Article ID BONE-MARROW TRANSPLANTATION; ONCOLOGY-GROUP; LEUKEMIA; CYCLOPHOSPHAMIDE; IMMUNOGLOBULIN; ETOPOSIDE; FAILURE; ANTIGEN; RISK AB Intensive chemoradiotherapy conditioning regimens and acute graft-versus-host disease (GVHD) are both associated with significant morbidity and mortality after bone marrow transplantation. In this study, we investigated whether the conditioning regimen affected the development of acute GVHD. Thirty-four patients, four with severe aplastic anemia and 30 with a lymphohemopoietic malignancy, were prepared for transplantation either with cyclophosphamide (CY) alone, with CY combined with total body irradiation (TBI) or CY combined with etoposide and either TBI or busulfan. GVHD prophylaxis included methotrexate (MTX 10 mg/m2) given on days 1, 3 and 6, and daily cyclosporine (CSP) on days -1 through 180. The overall incidence of acute GVHD was 36% (15% for HLA identical, 87% for HLA non-identical recipients). However, when assessed by the severity of conditioning regimen-related toxicity, the incidence of GVHD grades II-IV (HLA identical; HLA non-identical) was 0% (0%; 0%), 37% (20%; 67%) and 50% (22%; 100%) for patients with mild, moderate and severe toxicity, respectively. Compliance with GVHD prophylaxis declined with increasing intensity and toxicity of the conditioning regimen. These data suggest that a regimen of three doses of MTX and daily CSP is as effective as four doses of MTX/CSP for GVHD prophylaxis in patients given HLA identical marrow grafts. However, GVHD regimen compliance and efficacy of GVHD prevention are inversely related to the intensity of the conditioning regimen. C1 GEORGETOWN UNIV,MED CTR,VINCENT T LOMBARDI CANC RES CTR,BONE MARROW TRANSPLANT PROGRAM,WASHINGTON,DC 20007. GEORGETOWN UNIV,MED CTR,DEPT MED,WASHINGTON,DC 20007. GEORGETOWN UNIV,MED CTR,DEPT PEDIAT,WASHINGTON,DC 20007. GEORGETOWN UNIV,MED CTR,DEPT FAMILY MED,WASHINGTON,DC 20007. USN,MED RES CTR,BETHESDA,MD 20814. FU NCI NIH HHS [CA 14626] NR 34 TC 65 Z9 66 U1 1 U2 3 PU STOCKTON PRESS PI BASINGSTOKE PA HOUNDMILLS, BASINGSTOKE, HAMPSHIRE, ENGLAND RG21 6XS SN 0268-3369 J9 BONE MARROW TRANSPL JI Bone Marrow Transplant. PD MAR PY 1991 VL 7 IS 3 BP 193 EP 198 PG 6 WC Biophysics; Oncology; Hematology; Immunology; Transplantation SC Biophysics; Oncology; Hematology; Immunology; Transplantation GA FH265 UT WOS:A1991FH26500003 PM 2059756 ER PT J AU PARENTEAU, M CARLONE, C AUBIN, M KHANNA, SM ANDERSON, WT GERDES, JW AF PARENTEAU, M CARLONE, C AUBIN, M KHANNA, SM ANDERSON, WT GERDES, JW TI EFFECTS OF NEUTRON AND ELECTRON-IRRADIATION ON THE ABSORPTION-EDGE OF GAAS SO CANADIAN JOURNAL OF PHYSICS LA English DT Article ID GALLIUM-ARSENIDE; DEFECTS AB Semi-insulating liquid encapsulated Czochralski GaAs wafers were submitted to irradiation with 1 MeV neutrons, thermal neutrons, 7 MeV electrons, and white electrons (up to 7 MeV). The direct absorption edge was then studied by means of transmission (T = 15 K) and thermoreflectance (T = 35 and 51 K) measurements. Thermoreflectance spectra showed that the position of the exciton does not shift after irradiation with 1 MeV neutrons, but that its broadening parameter GAMMA increases as the fluence increases. Transmission measurements have revealed the presence of two acceptor levels (C and Zn) in the unirradiated samples. The absorption associated with these impurities increased by a factor of 10 after irradiation with 1 MeV neutrons. This effect was not produced by the three other types of radiation. However, an absorption tail extending well below the direct edge is seen after irradiation with all four types of particles. A model proposed by Toyozawa fits this continuum quite well, suggesting that irradiation causes amorphization of the crystal. The rate of introduction of defects and its dependence on irradiation fluence is different for each type of radiation. C1 UNIV SHERBROOKE,CTR RECH PHYS SOLIDE,SHERBROOKE J1K 2R1,QUEBEC,CANADA. DEF RES ESTAB,OTTAWA K1A 0Z4,ONTARIO,CANADA. USN,RES LAB,WASHINGTON,DC 20375. RP PARENTEAU, M (reprint author), UNIV SHERBROOKE,DEPT PHYS,SHERBROOKE J1K 2R1,QUEBEC,CANADA. NR 18 TC 2 Z9 2 U1 0 U2 0 PU NATL RESEARCH COUNCIL CANADA PI OTTAWA PA RESEARCH JOURNALS, MONTREAL RD, OTTAWA ON K1A 0R6, CANADA SN 0008-4204 J9 CAN J PHYS JI Can. J. Phys. PD MAR-APR PY 1991 VL 69 IS 3-4 BP 324 EP 328 PG 5 WC Physics, Multidisciplinary SC Physics GA FQ335 UT WOS:A1991FQ33500030 ER PT J AU CALDERHEAD, WL AF CALDERHEAD, WL TI SPECULATORS AND SLAVES - MASTERS, TRADERS, AND SLAVES IN THE OLD SOUTH - TADMAN,M SO CIVIL WAR HISTORY LA English DT Book Review RP CALDERHEAD, WL (reprint author), USN ACAD,ANNAPOLIS,MD 21402, USA. NR 1 TC 0 Z9 0 U1 0 U2 0 PU KENT STATE UNIV PRESS PI KENT PA KENT, OH 44242 SN 0009-8078 J9 CIVIL WAR HIST JI Civil War Hist. PD MAR PY 1991 VL 37 IS 1 BP 80 EP 81 PG 2 WC History SC History GA FB232 UT WOS:A1991FB23200013 ER PT J AU LOONEY, RE AF LOONEY, RE TI DEFENSE EXPENDITURES AND ECONOMIC-PERFORMANCE IN SOUTH-ASIA - TESTS OF CAUSALITY AND INTERDEPENDENCE SO CONFLICT MANAGEMENT AND PEACE SCIENCE LA English DT Article ID LESS DEVELOPED-COUNTRIES; THIRD-WORLD DEBT; MILITARY EXPENDITURES; ARMS PRODUCTION; GROWTH; INCOME; MONEY; DETERMINANTS; CAVEATS; IMPACT C1 USN,POSTGRAD SCH,NATL SECUR AFFAIRS,MONTEREY,CA 93940. NR 55 TC 7 Z9 7 U1 0 U2 1 PU PEACE SCIENCE SOC INT PI BINGHAMTON PA DEPT POLITICAL SCIENCE SUNY BINGHAMTON, BINGHAMTON, NY 13902-6000 SN 0738-8942 J9 CONFLICT MANAG PEACE JI Confl. Manage. Peace Sci. PD SPR PY 1991 VL 11 IS 2 BP 37 EP 67 PG 31 WC International Relations SC International Relations GA GK548 UT WOS:A1991GK54800003 ER PT J AU WIRTZ, JJ AF WIRTZ, JJ TI WAR, PEACE, SURVIVAL - GLOBAL POLITICS AND CONCEPTUAL SYNTHESIS - NORTH,RC SO CONFLICT MANAGEMENT AND PEACE SCIENCE LA English DT Book Review C1 USN,POSTGRAD SCH,MONTEREY,CA 93940. NR 1 TC 0 Z9 0 U1 0 U2 0 PU PEACE SCIENCE SOC INT PI BINGHAMTON PA DEPT POLITICAL SCIENCE SUNY BINGHAMTON, BINGHAMTON, NY 13902-6000 SN 0738-8942 J9 CONFLICT MANAG PEACE JI Confl. Manage. Peace Sci. PD SPR PY 1991 VL 11 IS 2 BP 99 EP 104 PG 6 WC International Relations SC International Relations GA GK548 UT WOS:A1991GK54800005 ER PT J AU LANZANO, P AF LANZANO, P TI WAVES GENERATED BY A MOVING POINT-SOURCE WITHIN A FINITE-DEPTH OCEAN SO EARTH MOON AND PLANETS LA English DT Article AB We consider a flat ocean of finite depth h consisting of an inviscid, incompressible fluid with no surface tension. A source of constant strength moves uniformly in a horizontal direction at a constant depth. We study the wake generated by this moving disturbance. Using the Fourier transform approach, we determine the unique velocity potential for this irrotational, steady motion, subject to the bottom and free-surface boundary conditions and to its vanishing at infinity. We use an asymptotic expansion due to Poincare to determine the elevation of the ocean surface at large distances R from the moving source along any direction displaced by a beta-angle from the direction of motion. We determine analytically the number and type of waves constituting the wake; we find: (1) if sigma-h > 1 (sigma = g/u02, u0 being the constant velocity), the semi-aperture beta* of the wake is always larger than the Kelvin value (approximately 19-degrees) but can never reach 90-degrees; for 0 < beta < pi/4 the wake consists of a transverse and a diverging wave, but for beta greater-than-or-equal-to pi/4 we get two transverse waves; (2) for sigma-h less-than-or-equal-to 1, we get beta* = pi/2 - theta-0 where cos2 theta-0 = sigma h less-than-or-equal-to 1; thus, beta* = pi/2 only when sigma-h = 1; for 0 < beta < pi/4 we get only one diverging wave, but this will transition to a transverse wave for beta greater-than-or-equal-to pi/4; (3) within the wake region, the elevation of the wave is of the R-1/2 order. C1 USN,RES LAB,WASHINGTON,DC 20375. NR 11 TC 0 Z9 0 U1 0 U2 0 PU KLUWER ACADEMIC PUBL PI DORDRECHT PA SPUIBOULEVARD 50, PO BOX 17, 3300 AA DORDRECHT, NETHERLANDS SN 0167-9295 J9 EARTH MOON PLANETS JI Earth Moon Planets PD MAR PY 1991 VL 52 IS 3 BP 233 EP 252 DI 10.1007/BF00140877 PG 20 WC Astronomy & Astrophysics; Geosciences, Multidisciplinary SC Astronomy & Astrophysics; Geology GA FV717 UT WOS:A1991FV71700002 ER PT J AU MUSHRUSH, GW HAZLETT, RN PELLENBARG, RE HARDY, DR AF MUSHRUSH, GW HAZLETT, RN PELLENBARG, RE HARDY, DR TI ROLE OF SULFUR-COMPOUNDS IN FUEL INSTABILITY - A MODEL STUDY OF THE FORMATION OF SULFONIC-ACIDS FROM HEXYL SULFIDE AND HEXYL DISULFIDE SO ENERGY & FUELS LA English DT Article ID TERT-BUTYL HYDROPEROXIDE; LIQUID-PHASE OXIDATION; DEOXYGENATED HYDROCARBONS; DEPOSIT FORMATION; GENERAL FEATURES AB There are inconsistencies in the literature regarding the role of organosulfur compounds in general, and sulfonic acids in particular, on the oxidative instability of middle distillate fuels. Comparison of published results between investigations is complicated by differences in a large number of variables. Variations in fuel composition, heteroatom distribution, reaction surface, hydroperoxide concentration, dissolved oxygen, and reaction temperature all contribute to the variation in observed results. In an effort to clarify this situation, with respect to sulfonic acid formation, we have examined the tert-butyl hydroperoxide liquid-phase oxidation reactions at 120-degrees-C of hexyl sulfide and hexyl disulfide in deaerated benzene solvent. We report the product slate and its distribution with reaction time and propose a mechanism that is consistent with the observed product slate. C1 GEORGE MASON UNIV,DEPT CHEM,FAIRFAX,VA 22030. HUGHES ASSOCIATES,WHEATON,MD 20902. RP MUSHRUSH, GW (reprint author), USN,RES LAB,NAVAL TECHNOL CTR SAFETY & SURVIVABIL,FUELS SECT,CODE 6180,WASHINGTON,DC 20375, USA. NR 30 TC 11 Z9 11 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 MAR-APR PY 1991 VL 5 IS 2 BP 258 EP 262 DI 10.1021/ef00026a006 PG 5 WC Energy & Fuels; Engineering, Chemical SC Energy & Fuels; Engineering GA FC614 UT WOS:A1991FC61400006 ER PT J AU SCHREIFELS, JA MORRIS, RE TURNER, NH MOWERY, RL HUES, SM AF SCHREIFELS, JA MORRIS, RE TURNER, NH MOWERY, RL HUES, SM TI ADSORPTION OF A METAL DEACTIVATOR ADDITIVE ONTO METAL-SURFACES SO ENERGY & FUELS LA English DT Article AB The adsorption of a metal deactivator (MDA) onto metal surfaces in a dodecane model fuel was studied. X-ray photoelectron spectroscopic (XPS) analysis of polished metal surfaces indicated that nitrogen levels were at the detection limits on 6061 aluminum,304 stainless steel, and copper. Thus, only small amounts of the compound could have adsorbed. Evidence for the presence of carboxylic acids were obtained during Fourier transform infrared analysis of these surfaces, but no MDA could be found until the dodecane was treated with silica gel to remove the acidic constituents prior to its use. Secondary ion mass spectrometric analysis of these surfaces showed that MDA was present, but its exact coverage could not be determined. The surfaces of tubes that had been heated in the jet fuel thermal oxidation tester (JFTOT) were also found to have a very weak nitrogen signal and a thick carbonaceous layer as low as 260-degrees-C. C1 USN,RES LAB,DIV CHEM,WASHINGTON,DC 20375. GEORGE MASON UNIV,DEPT CHEM,FAIRFAX,VA 22030. GEOCENTERS INC,FT WASHINGTON,MD 20744. NR 18 TC 8 Z9 8 U1 2 U2 5 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0887-0624 J9 ENERG FUEL JI Energy Fuels PD MAR-APR PY 1991 VL 5 IS 2 BP 263 EP 268 DI 10.1021/ef00026a007 PG 6 WC Energy & Fuels; Engineering, Chemical SC Energy & Fuels; Engineering GA FC614 UT WOS:A1991FC61400007 ER PT J AU HAZLETT, RN SCHREIFELS, JA STALICK, WM MORRIS, RE MUSHRUSH, GW AF HAZLETT, RN SCHREIFELS, JA STALICK, WM MORRIS, RE MUSHRUSH, GW TI DISTILLATE FUEL INSOLUBLES - FORMATION CONDITIONS AND CHARACTERIZATION SO ENERGY & FUELS LA English DT Article ID STORAGE STABILITY; DIESEL FUEL AB Organic acids promote the formation of insolubles in middle distillate fuels, particularly in blends containing cracked stock. Studies with a sulfonic acid demonstrate that this class of acids has a large effect and that it participates in two roles. First, it acts as an acid catalyst on the basis of the hydrogen ion concentration. In the other mode, sulfonic acid participates directly in insolubles formation, probably by salt formation with organic bases in the fuel. This latter suggestion is supported by the findings for nonaqueous titrations for strong acids and findings of XPS and mass spectral analyses. Thiols also increase insolubles formation. A part of the thiol oxidizes to sulfonic acid, which can act in two roles: (1) as an acid catalyst for insolubles producing reactions and (2) as a direct participant in insolubles formation. The mechanism of interaction of chloroacetic acid has not been defined. C1 GEOCENTERS INC,FT WASHINGTON,MD 20744. HUGHES ASSOCIATES,WHEATON,MD 20902. GEORGE MASON UNIV,DEPT CHEM,FAIRFAX,VA 22030. USN,RES LAB,WASHINGTON,DC 20375. NR 11 TC 17 Z9 17 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0887-0624 J9 ENERG FUEL JI Energy Fuels PD MAR-APR PY 1991 VL 5 IS 2 BP 269 EP 273 DI 10.1021/ef00026a008 PG 5 WC Energy & Fuels; Engineering, Chemical SC Energy & Fuels; Engineering GA FC614 UT WOS:A1991FC61400008 ER PT J AU BLACK, BH HARDY, DR BEAL, EJ AF BLACK, BH HARDY, DR BEAL, EJ TI ACCELERATED HYDROPEROXIDE FORMATION IN JET FUEL AT 65-DEGREES-C IN CAPPED AND VENTED BOTTLES SO ENERGY & FUELS LA English DT Letter C1 USN,RES LAB,WASHINGTON,DC 20375. RP BLACK, BH (reprint author), GEOCENTERS INC,FT WASHINGTON,MD 20744, USA. NR 5 TC 3 Z9 3 U1 0 U2 1 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0887-0624 J9 ENERG FUEL JI Energy Fuels PD MAR-APR PY 1991 VL 5 IS 2 BP 281 EP 282 DI 10.1021/ef00026a010 PG 2 WC Energy & Fuels; Engineering, Chemical SC Energy & Fuels; Engineering GA FC614 UT WOS:A1991FC61400010 ER PT J AU PERSON, JL HALUSZKA, O GRIMM, IS AF PERSON, JL HALUSZKA, O GRIMM, IS TI BILIARY STENT MIGRATION SO GASTROINTESTINAL ENDOSCOPY LA English DT Letter RP PERSON, JL (reprint author), USN HOSP,SAN DIEGO,CA 92134, USA. NR 3 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 0016-5107 J9 GASTROINTEST ENDOSC JI Gastrointest. Endosc. PD MAR-APR PY 1991 VL 37 IS 2 BP 210 EP 211 DI 10.1016/S0016-5107(91)70697-4 PG 2 WC Gastroenterology & Hepatology SC Gastroenterology & Hepatology GA FG079 UT WOS:A1991FG07900031 PM 2032617 ER PT J AU MILLETT, M MUNNO, F EBERT, D NELSON, M AF MILLETT, M MUNNO, F EBERT, D NELSON, M TI AN EVALUATION OF THE BD-100R RECHARGEABLE NEUTRON BUBBLE DOSIMETER SO HEALTH PHYSICS LA English DT Article ID SUPERHEATED DROP DETECTOR AB The purpose of this paper is to present data gathered in the evaluation of the BD-100R(R) neutron bubble dosimeter done at the University of Maryland and the Naval Research Lab. The performance of 12 dosimeters has been followed over 15 exposure-recharge cycles under a wide range of exposure conditions. Included in this paper are the results from tests on dose rate dependence, neutron energy dependence, beta and gamma exposure, and recharge cycle performance. A statistical analysis of the reusability performance of the dosimeter as a function of dose equivalent is also presented. C1 USN ACAD, DEPT NAVAL SYST ENGN, ANNAPOLIS, MD 21402 USA. RP MILLETT, M (reprint author), UNIV MARYLAND, DEPT MAT & NUCL ENGN, COLLEGE PK, MD 20742 USA. NR 9 TC 5 Z9 5 U1 0 U2 0 PU LIPPINCOTT WILLIAMS & WILKINS PI PHILADELPHIA PA 530 WALNUT ST, PHILADELPHIA, PA 19106-3621 USA SN 0017-9078 EI 1538-5159 J9 HEALTH PHYS JI Health Phys. PD MAR PY 1991 VL 60 IS 3 BP 375 EP 379 DI 10.1097/00004032-199103000-00007 PG 5 WC Environmental Sciences; Public, Environmental & Occupational Health; Nuclear Science & Technology; Radiology, Nuclear Medicine & Medical Imaging SC Environmental Sciences & Ecology; Public, Environmental & Occupational Health; Nuclear Science & Technology; Radiology, Nuclear Medicine & Medical Imaging GA EY911 UT WOS:A1991EY91100007 PM 1995510 ER PT J AU WHINNERY, JE AF WHINNERY, JE TI THEORETICAL-ANALYSIS OF ACCELERATION-INDUCED CENTRAL-NERVOUS-SYSTEM ISCHEMIA SO IEEE ENGINEERING IN MEDICINE AND BIOLOGY MAGAZINE LA English DT Article RP WHINNERY, JE (reprint author), USN,WARMINSTER,PA, USA. NR 0 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 0739-5175 J9 IEEE ENG MED BIOL JI IEEE Eng. Med. Biol. Mag. PD MAR PY 1991 VL 10 IS 1 BP 41 EP 45 DI 10.1109/51.70039 PG 5 WC Engineering, Biomedical; Medical Informatics SC Engineering; Medical Informatics GA EZ389 UT WOS:A1991EZ38900015 PM 18238359 ER PT J AU WHITLEY, PE AF WHITLEY, PE TI INTEGRATED PROTECTIVE SYSTEMS FOR OPERATIONAL ACCELERATION-INDUCED LOSS OF CONSCIOUSNESS SO IEEE ENGINEERING IN MEDICINE AND BIOLOGY MAGAZINE LA English DT Article RP WHITLEY, PE (reprint author), USN,DIV HUMAN FACTORS & PROTECT SYST,ENVIRONM EFFECTS BRANCH,WARMINSTER,PA, 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 0739-5175 J9 IEEE ENG MED BIOL JI IEEE Eng. Med. Biol. Mag. PD MAR PY 1991 VL 10 IS 1 BP 66 EP 75 DI 10.1109/51.70043 PG 10 WC Engineering, Biomedical; Medical Informatics SC Engineering; Medical Informatics GA EZ389 UT WOS:A1991EZ38900019 PM 18238363 ER PT J AU HOWERTON, MM BURNS, WK SKEATH, PR GREENBLATT, AS AF HOWERTON, MM BURNS, WK SKEATH, PR GREENBLATT, AS TI DEPENDENCE OF REFRACTIVE-INDEX ON HYDROGEN CONCENTRATION IN PROTON EXCHANGED LINBO3 SO IEEE JOURNAL OF QUANTUM ELECTRONICS LA English DT Article ID OPTICAL WAVE-GUIDES; LITHIUM-NIOBATE; WAVEGUIDING PROPERTIES; LI1-XHXNBO3; DEVICES; CRYSTAL AB The nonlinear relationship between refractive index and hydrogen concentration has been experimentally determined for proton exchanged LiNbO3, incorporating the effects of partial and full annealing. Complete annealing results in low-loss waveguides in the alpha phase with small surface index changes (less-than-or-equal-to 0.02). The anneal conditions needed to reach the alpha phase can be estimated using the measured temperature dependence of the anneal diffusion coefficient. A model is presented which attributes the index change in the alpha phase to the addition of hydrogen and the loss of lithium, which is consistent with experimental results. C1 SACHS FREEMAN ASSOCIATES INC,LANDOVER,MD. RP HOWERTON, MM (reprint author), USN,RES LAB,OPT TECH BRANCH,OPT WAVEGUIDE SECT,WASHINGTON,DC 20375, USA. NR 18 TC 68 Z9 71 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 0018-9197 J9 IEEE J QUANTUM ELECT JI IEEE J. Quantum Electron. PD MAR PY 1991 VL 27 IS 3 BP 593 EP 601 DI 10.1109/3.81368 PG 9 WC Engineering, Electrical & Electronic; Optics; Physics, Applied SC Engineering; Optics; Physics GA FR347 UT WOS:A1991FR34700040 ER PT J AU BERRY, MH GOOKIN, DM AF BERRY, MH GOOKIN, DM TI INTEGRATED OPTICAL DIFFERENTIAL-AMPLIFIER WITH LARGE DYNAMIC-RANGE FOR GIGAHERTZ BANDWIDTH ELECTRICAL SIGNALS SO IEEE PHOTONICS TECHNOLOGY LETTERS LA English DT Article AB A differential amplifier for gigahertz bandwidth electrical signals using fiber optics and integrated optical devices was demonstrated. The differential gain was a function of the electrical to optical and optical to electrical conversion factors. The common mode rejection ratio of our differential amplifier at 1 GHz was greater than 30 dB. The common mode rejection ratio depended on the time difference between the differential amplifier inputs. This device could be used as an integrated module in radar and communications systems. RP BERRY, MH (reprint author), USN,CTR OCEAN SYST,CODE 761 T,SAN DIEGO,CA 92152, USA. NR 4 TC 1 Z9 1 U1 0 U2 0 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 1041-1135 J9 IEEE PHOTONIC TECH L JI IEEE Photonics Technol. Lett. PD MAR PY 1991 VL 3 IS 3 BP 276 EP 277 DI 10.1109/68.79779 PG 2 WC Engineering, Electrical & Electronic; Optics; Physics, Applied SC Engineering; Optics; Physics GA FJ070 UT WOS:A1991FJ07000032 ER PT J AU GERLACH, K AF GERLACH, K TI ADAPTIVE CANCELER AND PULSE COMPRESSOR INTERACTIONS SO IEEE TRANSACTIONS ON AEROSPACE AND ELECTRONIC SYSTEMS LA English DT Article AB Performance results for the sidelobe level of a compressed pulse that has been preprocessed through an adaptive canceler are obtained. The adaptive canceler is implemented using the sampled matrix inversion (SMI) algorithm. Because of finite sampling, the quiescent compressed pulse sidelobe levels are degraded due to the preprocessing of the main channel input data stream (the uncompressed pulse) through an adaptive canceler. If N is the number of input canceler channels (main and auxiliaries) and K is the number of independent samples per channel, then it is shown that K/N can be significantly greater than one in order to retain sidelobes that are close to the original quiescent sidelobe level (with no adaptive canceler). Also it is shown that the maximum level of degradation is independent of whether pulse compression occurs before or after the adaptive canceler if the uncompressed pulse is completely contained within the K samples that are used to calculate the canceler weights. Furthermore, this same analysis can be used to predict the canceler noise power level which is induced by having the desired signal present in the canceler weight calculation. RP GERLACH, K (reprint author), USN,RES LAB,DIV RADAR,CODE 5340,WASHINGTON,DC 20375, USA. NR 18 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 MAR PY 1991 VL 27 IS 2 BP 331 EP 342 DI 10.1109/7.78307 PG 12 WC Engineering, Aerospace; Engineering, Electrical & Electronic; Telecommunications SC Engineering; Telecommunications GA FN091 UT WOS:A1991FN09100015 ER PT J AU IOANNOU, DE CRISTOLOVEANU, S POTAMIANOS, CN ZHONG, XD MCLARTY, PK HUGHES, HL AF IOANNOU, DE CRISTOLOVEANU, S POTAMIANOS, CN ZHONG, XD MCLARTY, PK HUGHES, HL TI OPTIMIZATION OF SIMOX FOR VLSI BY ELECTRICAL CHARACTERIZATION SO IEEE TRANSACTIONS ON ELECTRON DEVICES LA English DT Article ID SILICON-ON-INSULATOR; OXYGEN IMPLANTATION; CMOS DEVICES; MOSFETS; TRANSISTORS AB A comprehensive electrical characterization study was conducted to optimize the fabrication of SIMOX substrates for VLSI. The oxygen implantation was carried out using medium-current and high-current implanters and the wafers were annealed at 1275-degrees-C and 1300-degrees-C to produce high-quality, precipitate-free material. The sample selection was designed to study three main aspects of this technology: the effect of dose, the effect of multiple implantation (by sequentially implanting and annealing), and the effect of anneal ambient gas and capping layer during annealing. MOSFET's of various geometries and gate oxide of approximately 20 nm were fabricated by a CMOS process incorporating the addition of a thin epitaxial Si layer. A general evaluation of each transistor was conducted by studying its static I(D)(V(G), V(D)) characteristics. The interface states were evaluated by dynamic conductance, dynamic transconductance, and charge pumping; the bulk traps by current-DLTS; and carrier generation phenomena by generation-DLTS and the dual-gate Zerbst-like method. Good-quality interfaces were obtained, in particular by a relatively low oxygen dose (1.4 x 10(18) cm-2) and high-temperature annealing (greater-than-or-equal to 1275-degrees-C); better implantation control reduced contamination and supressed deep traps below the detection limit; and multiple implantation resulted in superior material quality, as evidenced by very long generation lifetime values (> 100-mu-s). C1 UNIV MARYLAND,DEPT ELECT ENGN,COLLEGE PK,MD 20742. N CAROLINA STATE UNIV,DEPT ELECT ENGN,RALEIGH,NC 27695. USN,RES LAB,WASHINGTON,DC 20375. RP IOANNOU, DE (reprint author), GEORGE MASON UNIV,DEPT ELECT & COMP ENGN,FAIRFAX,VA 22030, USA. NR 21 TC 7 Z9 7 U1 0 U2 0 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0018-9383 J9 IEEE T ELECTRON DEV JI IEEE Trans. Electron Devices PD MAR PY 1991 VL 38 IS 3 BP 463 EP 468 DI 10.1109/16.75154 PG 6 WC Engineering, Electrical & Electronic; Physics, Applied SC Engineering; Physics GA EY647 UT WOS:A1991EY64700006 ER PT J AU NEIDERT, RE PHILLIPS, PM SMITH, ST SPINDT, CA AF NEIDERT, RE PHILLIPS, PM SMITH, ST SPINDT, CA TI FIELD-EMISSION TRIODES SO IEEE TRANSACTIONS ON ELECTRON DEVICES LA English DT Article AB Triode RF amplifier structures using field emission cathodes have been investigated from both the theoretical and experimental viewpoint. This paper describes the physically large experimental structure which has been used and the theoretical calculations on that structure. The agreement between theory and experiment for both dc and ac measurements is shown to be very good. The theoretical circuit modeling has produced information which will be useful in future work for higher frequency operation. RF voltage gain of about 11 dB has been measured at low frequencies, dropping to 0 dB at 200 kHz, with a cathode which had only 38-mu-S transconductance. Model calculations on the large structure used show operation to about 2 MHz with more typical transconductance of 380-mu-S for a 1000-cone field emission cathode. C1 SCI APPLICAT INT CORP,DIV PLASMA PHYS,MCLEAN,VA 22102. SRI INT,VACUUM MICROELECTR PROGRAM,MENLO PK,CA 94025. RP NEIDERT, RE (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 5 TC 27 Z9 27 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 MAR PY 1991 VL 38 IS 3 BP 661 EP 665 DI 10.1109/16.75178 PG 5 WC Engineering, Electrical & Electronic; Physics, Applied SC Engineering; Physics GA EY647 UT WOS:A1991EY64700030 ER PT J AU EPPLER, DT FARMER, LD AF EPPLER, DT FARMER, LD TI TEXTURE ANALYSIS OF RADIOMETRIC SIGNATURES OF NEW SEA ICE FORMING IN ARCTIC LEADS SO IEEE TRANSACTIONS ON GEOSCIENCE AND REMOTE SENSING LA English DT Article DE PASSIVE MICROWAVE; SEA ICE; NEW ICE; LEADS; ICE CLASSIFICATION; GRADIENT OPERATOR; TEXTURE ANALYSIS ID MODEL AB Analysis of 33.6-GHz, high-resolution, passive microwave images suggests that new sea ice accumulating in open leads is characterized by a unique textural signature which can be used to discriminate new ice forming in this environment from adjacent surfaces of similar radiometric temperature. Data analyzed were acquired in March 1988 in conjunction with the joint Navy-NASA SSM/I Sea Ice Validation Experiment using the Navy Ka-band Radiometric Mapping System (KRMS), an airborne passive microwave imager. Ten training areas were selected from the data set, three of which consisted entirely of first-year ice, four entirely of multiyear ice, and three of new ice in open leads in the process of freezing. A simple gradient operator was used to characterize the radiometric texture in each training region in terms of the degree to which radiometric gradients are oriented. New ice in leads has a sufficiently high proportion of well-oriented features to distinguish it uniquely from first-year ice and multiyear ice. The predominance of well-oriented features probably reflects physical processes by which new ice accumulates in open leads. Banded structures, which are evident in aerial photographs of new ice, apparently give rise to the radiometric signature observed here, in which the trend of brightness temperature gradients is aligned parallel to lead trends. First-year ice and multiyear ice, which have been subjected to a more random growth and process history, lack this banded structure and therefore are characterized by signatures in which well-aligned elements are less dominant. RP EPPLER, DT (reprint author), USN,OCEANOG & ATMOSPHER RES LAB,POLAR OCEANOG BRANCH OFF,72 LYME RD,HANOVER,NH 03755, USA. NR 17 TC 6 Z9 6 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 0196-2892 J9 IEEE T GEOSCI REMOTE JI IEEE Trans. Geosci. Remote Sensing PD MAR PY 1991 VL 29 IS 2 BP 233 EP 241 DI 10.1109/36.73664 PG 9 WC Geochemistry & Geophysics; Engineering, Electrical & Electronic; Remote Sensing; Imaging Science & Photographic Technology SC Geochemistry & Geophysics; Engineering; Remote Sensing; Imaging Science & Photographic Technology GA EY436 UT WOS:A1991EY43600005 ER PT J AU WOLF, SA KRESIN, VZ AF WOLF, SA KRESIN, VZ TI MAJOR PARAMETERS OF HIGH-TC OXIDES SO IEEE TRANSACTIONS ON MAGNETICS LA English DT Article; Proceedings Paper CT 1990 APPLIED SUPERCONDUCTIVITY CONF CY SEP 24-28, 1990 CL SNOWMASS, CO SP TELEDYNE WAH CHANG ALBANY, US DOE, HYPRES, GEN DYNAM ID SUPERCONDUCTORS AB The major normal and superconducting parameters of several cuprate superconductors are evaluated and discussed. The effects of the two-gap structure in Y1Ba2Cu3O7 are especially emphasized. C1 UNIV CALIF BERKELEY LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. RP WOLF, SA (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. RI Wolf, Stuart/A-7513-2009 NR 15 TC 6 Z9 6 U1 0 U2 0 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0018-9464 J9 IEEE T MAGN JI IEEE Trans. Magn. PD MAR PY 1991 VL 27 IS 2 BP 852 EP 853 DI 10.1109/20.133308 PN 2 PG 2 WC Engineering, Electrical & Electronic; Physics, Applied SC Engineering; Physics GA EY652 UT WOS:A1991EY65200010 ER PT J AU CHRISEY, DB HORWITZ, JS NEWMAN, HS WEAVER, BD GRABOWSKI, KS CESTONE, VC REEVES, ME POND, JM SUMMERS, GP AF CHRISEY, DB HORWITZ, JS NEWMAN, HS WEAVER, BD GRABOWSKI, KS CESTONE, VC REEVES, ME POND, JM SUMMERS, GP TI PARTICLE-INDUCED MODIFICATION OF THIN-FILM YBA2CU3O7-DELTA TRANSPORT-PROPERTIES AND MICROWAVE DEVICE PERFORMANCE SO IEEE TRANSACTIONS ON MAGNETICS LA English DT Article; Proceedings Paper CT 1990 APPLIED SUPERCONDUCTIVITY CONF CY SEP 24-28, 1990 CL SNOWMASS, CO SP TELEDYNE WAH CHANG ALBANY, US DOE, HYPRES, GEN DYNAM ID YBA2CU3O7-DELTA AB We have examined the modification of the microwave surface resistance (R(S)), the critical current (J(c)), and the critical temperature (T(c)) resulting from 2 MeV H+ and 12 MeV Si4+ irradiation of high quality thin films of YBa2Cu3O7-delta on <100> LaAlO3 substrates. For both ions the change in T(c)(R = 0) and J(c)(77 K and 4.2 K) was roughly linearly with fluence. The change in these properties with fluence was quantitatively similar once corrected for differences in the rate of energy loss to atomic displacements. R(s) was also measured as a function of temperature for the same films at 36 GHz using the cylindrical cavity end-wall replacement technique. High quality c-axis oriented films exhibited sharp transitions in R(s) near T(c) followed by a relatively temperature independent R(s) with a value of approximately 6 mohms at 20 K. For irradiation with H+ and Si4+ ions the sharp transition in R(s) was shifted to lower temperatures although below the transition temperature R(S)(T) was unchanged. The loaded quality factor, or Q, of a 5.3 GHz ring resonator, patterned from a 500 nm film on <100> MgO substrate, was measured as a function of temperature for 2 MeV H+ irradiation. While Q(T) was observed to decrease as a function of fluence Q(T/T(c)) was invarient as expected from the insensitivity of R(S) to particle fluence below approximately 0.9T(c). RP CHRISEY, DB (reprint author), USN,RES LAB,4555 OVERLOOK AVE SW,WASHINGTON,DC 20375, USA. OI Grabowski, Kenneth/0000-0003-0816-001X NR 14 TC 1 Z9 1 U1 0 U2 1 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0018-9464 J9 IEEE T MAGN JI IEEE Trans. Magn. PD MAR PY 1991 VL 27 IS 2 BP 884 EP 887 DI 10.1109/20.133315 PN 2 PG 4 WC Engineering, Electrical & Electronic; Physics, Applied SC Engineering; Physics GA EY652 UT WOS:A1991EY65200017 ER PT J AU BERKLEY, DD BROUSSARD, PR ERVIN, AM AF BERKLEY, DD BROUSSARD, PR ERVIN, AM TI SURFACE CHARACTERIZATION OF YBA2CU3O7-X THIN-FILMS SUPPORTING METALLIC AND INSULATING OVERLAYERS SO IEEE TRANSACTIONS ON MAGNETICS LA English DT Article; Proceedings Paper CT 1990 APPLIED SUPERCONDUCTIVITY CONF CY SEP 24-28, 1990 CL SNOWMASS, CO SP TELEDYNE WAH CHANG ALBANY, US DOE, HYPRES, GEN DYNAM ID PURE OZONE VAPOR AB The interface between thin films of the YBa2Cu3O7-x superconductor and metallic and insulating overlayers is studied using films prepared in-situ by coevaporation employing ozone vapor oxidation. Thin layers of Y, Y2O3, and BaF2 can be evaporated at various stages of the YBa2Cu3O7-x cool-down process. The effect of the overlayers on the oxidation state of the superconductor copper signal can be assessed using X-ray photoelectron spectroscopy (XPS). RP BERKLEY, DD (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 7 TC 1 Z9 1 U1 0 U2 0 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0018-9464 J9 IEEE T MAGN JI IEEE Trans. Magn. PD MAR PY 1991 VL 27 IS 2 BP 966 EP 969 DI 10.1109/20.133962 PN 2 PG 4 WC Engineering, Electrical & Electronic; Physics, Applied SC Engineering; Physics GA EY652 UT WOS:A1991EY65200039 ER PT J AU FRANCAVILLA, TL HEIN, RA AF FRANCAVILLA, TL HEIN, RA TI THE OBSERVATION OF A TRANSVERSE VOLTAGE AT THE SUPERCONDUCTING TRANSITION OF THIN-FILMS SO IEEE TRANSACTIONS ON MAGNETICS LA English DT Article; Proceedings Paper CT 1990 APPLIED SUPERCONDUCTIVITY CONF CY SEP 24-28, 1990 CL SNOWMASS, CO SP TELEDYNE WAH CHANG ALBANY, US DOE, HYPRES, GEN DYNAM AB Monitoring the resistive normal-superconducting transition in a number of thin films by means of the van der Pauw technique has led to the observation of a voltage, V(T), transverse to the direction of current flow. This voltage, commonly attributed to current redistribution, is observed only in the mixed state and occurs in the absence of any externally applied magnetic field. Studies of V(T) as a function of temperature, current and film orientation are reported and analyzed in terms of current theoretical concepts involving vortex-antivortex interactions. RP FRANCAVILLA, TL (reprint author), USN,RES LAB,4555 OVERLOOK AVE,WASHINGTON,DC 20375, USA. NR 16 TC 17 Z9 17 U1 1 U2 3 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0018-9464 J9 IEEE T MAGN JI IEEE Trans. Magn. PD MAR PY 1991 VL 27 IS 2 BP 1039 EP 1042 DI 10.1109/20.133356 PN 2 PG 4 WC Engineering, Electrical & Electronic; Physics, Applied SC Engineering; Physics GA EY652 UT WOS:A1991EY65200056 ER PT J AU BHASIN, KB WARNER, JD MIRANDA, FA GORDON, WL NEWMAN, HS AF BHASIN, KB WARNER, JD MIRANDA, FA GORDON, WL NEWMAN, HS TI DETERMINATION OF SURFACE-RESISTANCE AND MAGNETIC PENETRATION DEPTH OF SUPERCONDUCTING YBA2CU3O7-DELTA THIN-FILMS BY MICROWAVE-POWER TRANSMISSION MEASUREMENTS SO IEEE TRANSACTIONS ON MAGNETICS LA English DT Article; Proceedings Paper CT 1990 APPLIED SUPERCONDUCTIVITY CONF CY SEP 24-28, 1990 CL SNOWMASS, CO SP TELEDYNE WAH CHANG ALBANY, US DOE, HYPRES, GEN DYNAM ID ORIENTED YBA2CU3O7-DELTA AB A novel waveguide power transmission measurement technique has been developed to extract the complex conductivity (sigma* = sigma-1 - j-sigma-2) of superconducting thin films at microwave frequencies. We obtained the microwave conductivity of two laser-ablated YBa2Cu3O7-delta thin films on LaAlO3 with transition temperatures (T(c)) of approximately 86.3 and 82 K, respectively, in the temperature range 25 to 300 K. From the conductivity values we calculated the penetration depth (lambda) to be approximately 0.54 and 0.43-mu-m, and the surface resistance(R(s)) to be approximately 24 and 36 m-OMEGA at 36 GHz and 76 K for the two films under consideration. We further compared the R(s) values with those obtained from the change in the Q-factor of a 36 GHz TE011-mode (OFHC) copper cavity by replacing one of its end walls with the superconducting sample. We found that this technique allows noninvasive characterization of high-T(c) superconducting thin films at microwave frequencies. C1 CASE WESTERN RESERVE UNIV,DEPT PHYS,CLEVELAND,OH 44106. USN,RES LAB,WASHINGTON,DC 20375. RP BHASIN, KB (reprint author), NASA,LEWIS RES CTR,CLEVELAND,OH 44135, USA. NR 12 TC 13 Z9 13 U1 0 U2 1 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0018-9464 J9 IEEE T MAGN JI IEEE Trans. Magn. PD MAR PY 1991 VL 27 IS 2 BP 1284 EP 1287 DI 10.1109/20.133418 PN 2 PG 4 WC Engineering, Electrical & Electronic; Physics, Applied SC Engineering; Physics GA EY652 UT WOS:A1991EY65200116 ER PT J AU THORPE, TP CUKAUSKAS, EJ ALLEN, LH REEVES, M AF THORPE, TP CUKAUSKAS, EJ ALLEN, LH REEVES, M TI INVESTIGATION OF ERBA2CU3O7/CU2O/NORMAL METAL TUNNEL STRUCTURES SO IEEE TRANSACTIONS ON MAGNETICS LA English DT Article; Proceedings Paper CT 1990 APPLIED SUPERCONDUCTIVITY CONF CY SEP 24-28, 1990 CL SNOWMASS, CO SP TELEDYNE WAH CHANG ALBANY, US DOE, HYPRES, GEN DYNAM AB Tunneling studies have been made using sputtered Cu2O as an insulating barrier between a EBCO thin film and a normal metallic layer. Cu2O was selected both for its low potential for chemical reaction with the superconducting layer, and for its photoconductive properties. Having a band gap in the visible (2eV), Cu2O is a suitable candidate for photosensitive tunneling experiments. EBCO thin films were deposited in-situ onto MgO substrates using an off-axis sputtering technique. T(c)'s of as-deposited films were between 80 and 85 K. Inductively measured Jc's ranged between 10(6) and 10(7) A/cm2 at 4 K. A 5-20 nm layer of Cu2O was sputtered directly on top of the superconducting film. Room temperature resistivities of the Cu2O layer were typically greater than 10(6) ohm-cm. A normal metal layer (typically gold) was then deposited onto the Cu2O layer. Transport properties of the structure were then measured at temperatures ranging above and below the T(c) of the superconducting layer. A summary of results will be presented. RP THORPE, TP (reprint author), USN,RES LAB,4555 OVERLOOK AVE SW,WASHINGTON,DC 20375, USA. NR 3 TC 1 Z9 1 U1 0 U2 0 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0018-9464 J9 IEEE T MAGN JI IEEE Trans. Magn. PD MAR PY 1991 VL 27 IS 2 BP 1332 EP 1334 DI 10.1109/20.133972 PN 2 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied SC Engineering; Physics GA EY652 UT WOS:A1991EY65200129 ER PT J AU ALLEN, LH CUKAUSKAS, EJ BROUSSARD, PR VANDAMME, PK AF ALLEN, LH CUKAUSKAS, EJ BROUSSARD, PR VANDAMME, PK TI PREPARATION OF THIN-FILMS OF Y1BA2CU3O7-X BY MAGNETRON SPUTTERING TECHNIQUES SO IEEE TRANSACTIONS ON MAGNETICS LA English DT Article; Proceedings Paper CT 1990 APPLIED SUPERCONDUCTIVITY CONF CY SEP 24-28, 1990 CL SNOWMASS, CO SP TELEDYNE WAH CHANG ALBANY, US DOE, HYPRES, GEN DYNAM AB The discovery of superconductivity at temperatures above 77 K has produced much interest in developing thin film circuits using these materials. The most successful techniques applied to growing thin films of the 90 K superconductor, Y1Ba2Cu3O7-x, include evaporation, sputtering, and laser ablation. We have been studying three variations of sputtering: a 3 metal co-sputtering technique requiring a post-anneal at high temperatures, an in situ process using an inverted cylindrical magnetron sputter gun, 1 adn another in situ process using a planar target in an off-axis geometry. 2 Our films are grown primarily on magnesium oxide (MgO) substrates because it is readily available, inexpensive, and its low dielectric constant permits convenient microwave circuit design. We find that our co-sputter process with post-anneal produces films with depressed T(c)'s and J(c)'s. The inverted cylindrical magnetron sputtering has yielded the best films with complete transitions as high as 87 K and J(c) = 4 x 10(6) A/cm2 at 4 K. Our off-axis results are not quite as good, with 79 K complete transitions. In this paper, we discuss these and other results, as well as some of the problems we have encountered with these sputtering techniques. RP ALLEN, LH (reprint author), USN,RES LAB,4555 OVERLOOK AVE SW,WASHINGTON,DC 20375, USA. NR 7 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 0018-9464 J9 IEEE T MAGN JI IEEE Trans. Magn. PD MAR PY 1991 VL 27 IS 2 BP 1406 EP 1409 DI 10.1109/20.133977 PN 2 PG 4 WC Engineering, Electrical & Electronic; Physics, Applied SC Engineering; Physics GA EY652 UT WOS:A1991EY65200148 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 DETECTION OF LIGHT USING HIGH-TEMPERATURE SUPERCONDUCTING MICROSTRIP LINES SO IEEE TRANSACTIONS ON MAGNETICS LA English DT Article; Proceedings Paper CT 1990 APPLIED SUPERCONDUCTIVITY CONF CY SEP 24-28, 1990 CL SNOWMASS, CO SP TELEDYNE WAH CHANG ALBANY, US DOE, HYPRES, GEN DYNAM AB We report the results of measurements of the effects of external light on the transmission of microwaves through superconducting YBa2Cu3O7-delta microstrip lines. The microstrip geometries used include an asymmetric ring and a meander path. Measurements were made as a function of the microwave frequency (up to 12 GHz), as a function of temperature (above to below the superconducting transition temperature), and as a function of microwave power. We observed a position dependent photoresponse due to local variations in the T(c) of the superconductor - caused by locally varying microwave current densities (standing wave component); At low microwave powers this technique can be used to optically probe the local character of the superconducting film without having to move contacts over the film. The asymmetric ring microstrip interferometer was observed to show light induced shifts in the null frequencies due to the kinetic inductance effect. RP CULBERTSON, JC (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. RI Wolf, Stuart/A-7513-2009 NR 5 TC 3 Z9 3 U1 0 U2 0 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0018-9464 J9 IEEE T MAGN JI IEEE Trans. Magn. PD MAR PY 1991 VL 27 IS 2 BP 1536 EP 1539 DI 10.1109/20.133476 PN 2 PG 4 WC Engineering, Electrical & Electronic; Physics, Applied SC Engineering; Physics GA EY652 UT WOS:A1991EY65200177 ER PT J AU GUBSER, DU MILLER, MM TOTH, L RAYNE, R LAWRENCE, S ALFORD, NM BUTTONS, TW AF GUBSER, DU MILLER, MM TOTH, L RAYNE, R LAWRENCE, S ALFORD, NM BUTTONS, TW TI SUPERCONDUCTING CURRENT LEADS OF YBCO AND PB-BSCCO SO IEEE TRANSACTIONS ON MAGNETICS LA English DT Article; Proceedings Paper CT 1990 CONF ON APPLIED SUPERCONDUCTIVITY CY SEP 24-28, 1990 CL SNOWMASS, CO ID FIELD AB We have fabricated and measured cylindrical superconducting current leads composed of a Y1Ba2Cu3O7 (YBCO) and Bi(2-x)Pb(x)Sr2Ca2Cu3O10 (Pb-BSCCO), approximately 20 cm long and 1 cm2 cross section. A steady state, dc, critical current of 170 (230) amperes at a temperature of 77 K was measured for YBCO (Pb-BSCCO) using a voltage criterion of 2 x 10(-7) volts/cm (rho = 8 x 10(-10) ohm-cm). This current was limited by the current-induced, self magnetic field. At a temperature of 63 K this current increased to approximately 390 (465) amperes. The character of the magnetic field dependence of the critical current and the shape of the current induced voltage curves are different for the two materials. C1 ICI PLC,ADV MAT,RUNCORN WA7 4QE,ENGLAND. RP GUBSER, DU (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 9 TC 14 Z9 14 U1 1 U2 3 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0018-9464 J9 IEEE T MAGN JI IEEE Trans. Magn. PD MAR PY 1991 VL 27 IS 2 BP 1854 EP 1857 DI 10.1109/20.133557 PN 3 PG 4 WC Engineering, Electrical & Electronic; Physics, Applied SC Engineering; Physics GA EY653 UT WOS:A1991EY65300046 ER PT J AU FRANCAVILLA, TL FORD, RD LUPTON, WH ALFORD, NM SAUNDERS, CS AF FRANCAVILLA, TL FORD, RD LUPTON, WH ALFORD, NM SAUNDERS, CS TI AN EXPLOSIVE OPENING SUPERCONDUCTING SWITCH SO IEEE TRANSACTIONS ON MAGNETICS LA English DT Article; Proceedings Paper CT 1990 CONF ON APPLIED SUPERCONDUCTIVITY CY SEP 24-28, 1990 CL SNOWMASS, CO ID TECHNOLOGY AB A superconducting YBCO tube was tested as an opening switch to demonstrate novel switching concepts for inductive energy storage. The tube was connected in series with a 1.2 mH inductor, and a 4800-mu-F capacitor bank which was charged to a predetermined level and discharged through the circuit. No measurable dissipation was observed for test discharges of 8 ms duration, with maximum pulse amplitude increasing for each test while the YBCO was superconducting at 77 K. At the highest current pulse maximum of 95 A, the switch was opened by exploding a short length of detonating cord inserted into the center of the tube. The current decreased to zero, and the voltage increased to maximum in approximately 160 mu-s, resulting in a voltage gain of over 25 for current commutation purposes. The data indicate that high T(c) ceramic materials have potential in this application. C1 ICI AMER INC,ADV MAT,WILMINGTON,DE 19897. RP FRANCAVILLA, TL (reprint author), USN,RES LAB,4555 OVERLOOK AVE,WASHINGTON,DC 20375, USA. NR 10 TC 2 Z9 2 U1 0 U2 1 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0018-9464 J9 IEEE T MAGN JI IEEE Trans. Magn. PD MAR PY 1991 VL 27 IS 2 BP 1870 EP 1873 DI 10.1109/20.133561 PN 3 PG 4 WC Engineering, Electrical & Electronic; Physics, Applied SC Engineering; Physics GA EY653 UT WOS:A1991EY65300050 ER PT J AU RITTER, JC NISENOFF, M PRICE, G WOLF, SA AF RITTER, JC NISENOFF, M PRICE, G WOLF, SA TI HIGH-TEMPERATURE SUPERCONDUCTIVITY SPACE EXPERIMENT (HTSSE) SO IEEE TRANSACTIONS ON MAGNETICS LA English DT Article; Proceedings Paper CT 1990 CONF ON APPLIED SUPERCONDUCTIVITY CY SEP 24-28, 1990 CL SNOWMASS, CO AB The Naval Research Laboratory (NRL) is developing an experiment to deploy high temperature superconducting (HTS) devices and components in space. A variety of devices, primarily passive microwave and millimeter wave components, has been procured and will be integrated with a cryogenic refrigerating and data acquisition system to form the space package, which will be launched late in 1992. This space experiment will demonstrate that this technology is sufficiently robust to survive the space environment and that has the potential to improve the operation of space systems significantly. The devices for the initial launch (HTSSE-I) have been received by NRL and evaluated electrically, thermally and mechanically and will be integrated into the final space package early in 1991. The performance of the devices will be summarized and some potential applications of HTS technology in space systems will be outlined. RP RITTER, JC (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. RI Wolf, Stuart/A-7513-2009 NR 0 TC 30 Z9 31 U1 0 U2 0 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0018-9464 J9 IEEE T MAGN JI IEEE Trans. Magn. PD MAR PY 1991 VL 27 IS 2 BP 2533 EP 2536 DI 10.1109/20.133732 PN 4 PG 4 WC Engineering, Electrical & Electronic; Physics, Applied SC Engineering; Physics GA EY654 UT WOS:A1991EY65400001 ER PT J AU NEWMAN, HS CHRISEY, DB HORWITZ, JS WEAVER, BD REEVES, ME AF NEWMAN, HS CHRISEY, DB HORWITZ, JS WEAVER, BD REEVES, ME TI MICROWAVE DEVICES USING YBA2CU3O7-DELTA FILMS MADE BY PULSED LASER DEPOSITION SO IEEE TRANSACTIONS ON MAGNETICS LA English DT Article; Proceedings Paper CT 1990 CONF ON APPLIED SUPERCONDUCTIVITY CY SEP 24-28, 1990 CL SNOWMASS, CO ID TEMPERATURE AB High-quality oriented thin films of YBa2Cu3O7-delta having transition temperatures > 88 K and critical current densities (at 77 K, zero magnetic field) > 10(6) A/cm2 have been made by pulsed laser deposition on <100> MgO and LaAlO3 substrates. The microwave surface resistance (R(s)) has been measured between 20 K and 120 K at 36 GHz by a copper cavity end-wall-replacement technique. R(S) measurements show consistently sharp transitions having high critical temperature onsets with low residual surface resistances (< 10 m-OMEGA at 36 GHz and 77 K). Microwave devices fabricated from films on MgO have included an X-Band modified 5-pole Chebyschev filter having an insertion loss of approximately .8 dB at 77 K. Irradiation of unpatterned films on LaAlO3 with 2 MeV H+ ions at a fluence increment of 10(16)/cm2 resulted in only a small shift (approximately 2 K) in the 36 GHz microwave transition temperature. No accompanying degradation in the residual surface resistance was observed within the sensitivity of our measurement. RP NEWMAN, HS (reprint author), USN,RES LAB,4555 OVERLOOK AVE SW,WASHINGTON,DC 20375, USA. NR 6 TC 40 Z9 40 U1 0 U2 2 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0018-9464 J9 IEEE T MAGN JI IEEE Trans. Magn. PD MAR PY 1991 VL 27 IS 2 BP 2540 EP 2543 DI 10.1109/20.133734 PN 4 PG 4 WC Engineering, Electrical & Electronic; Physics, Applied SC Engineering; Physics GA EY654 UT WOS:A1991EY65400003 ER PT J AU VANVECHTEN, D BOYER, C FRITZ, GG KING, S KOWASKI, MP LOVELLETTE, MN BLAMIRE, MG KIRK, E SOMEKH, RE AF VANVECHTEN, D BOYER, C FRITZ, GG KING, S KOWASKI, MP LOVELLETTE, MN BLAMIRE, MG KIRK, E SOMEKH, RE TI SUPERCONDUCTING TUNNEL-JUNCTIONS FOR USE AS ENERGY RESOLVING X-RAY-DETECTORS SO IEEE TRANSACTIONS ON MAGNETICS LA English DT Article; Proceedings Paper CT 1990 CONF ON APPLIED SUPERCONDUCTIVITY CY SEP 24-28, 1990 CL SNOWMASS, CO AB Tin tunnel junctions have been used to detect 5.9 keV X-rays with 41 eV resolution. The statistical limit of the energy resolution of such a detector, determined by the pair breaking energy, is less than 10 eV. Junctions fabricated from Nb-Al-Al2O3-Al-Nb trilayer will be better able to withstand thermal cycling. We report measurements of the response of Nb tunnel junctions to pulsed 650 nm radiation, the effect of changing the bias voltage on the magnitude of the voltage pulse developed across the junction, and the linearity of the response of the junction to changes in the deposited energy. C1 UNIV SPACE RES ASSOC,WASHINGTON,DC. UNIV CAMBRIDGE,CAMBRIDGE,ENGLAND. RP VANVECHTEN, D (reprint author), USN,RES LAB,EO HULBURT CTR SPACE RES,WASHINGTON,DC 20375, USA. NR 10 TC 5 Z9 5 U1 0 U2 0 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0018-9464 J9 IEEE T MAGN JI IEEE Trans. Magn. PD MAR PY 1991 VL 27 IS 2 BP 2665 EP 2668 DI 10.1109/20.133760 PN 4 PG 4 WC Engineering, Electrical & Electronic; Physics, Applied SC Engineering; Physics GA EY654 UT WOS:A1991EY65400030 ER PT J AU WOOD, KS LOVELLETTE, MN VANVECHTEN, D AF WOOD, KS LOVELLETTE, MN VANVECHTEN, D TI MODELING QUASI-PARTICLE PRODUCTION AND PROPAGATION IN TUNNEL JUNCTION BASED X-RAY-DETECTORS SO IEEE TRANSACTIONS ON MAGNETICS LA English DT Article; Proceedings Paper CT 1990 CONF ON APPLIED SUPERCONDUCTIVITY CY SEP 24-28, 1990 CL SNOWMASS, CO AB Optimization of the energy resolution of Josephson tunnel junction x-ray detectors requires the minimization of event to event variation in the number of non-equilibrium quasiparticles that tunnel and are thereby detected for monochromatic input. This requires a detailed understanding of the determinants of the time scales for the degradation of the energy and expansion of the disturbed volume, of possible quasiparticle self-trapping and phonon bottle-necking, and of the impact of materials parameters such as grain size. Moreover the signals of distributed detectors cannot be interpreted without a detailed model of the evolution of the spatial variation in QP density. We discuss these matters and the extent to which the details of the QP tunneling pulse probes the energy degradation and expansion. The expansion is modeled in 2 dimensions with Monte Carlo simulations of ballistic quasiparticle propagation between randomizing collisions and compared with published data for a distributed junction detector. Alternative explanations of the high quasiparticle loss rate and curvature seen in the published plots of the relative fraction of the QP detected by the 2 sensing junctions are offered. RP WOOD, KS (reprint author), USN,RES LAB,EO HULBURT CTR SPACE RES,WASHINGTON,DC 20375, USA. NR 14 TC 1 Z9 1 U1 0 U2 0 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0018-9464 J9 IEEE T MAGN JI IEEE Trans. Magn. PD MAR PY 1991 VL 27 IS 2 BP 2673 EP 2676 DI 10.1109/20.133762 PN 4 PG 4 WC Engineering, Electrical & Electronic; Physics, Applied SC Engineering; Physics GA EY654 UT WOS:A1991EY65400032 ER PT J AU POND, JM CARROLL, KR CUKAUSKAS, EJ AF POND, JM CARROLL, KR CUKAUSKAS, EJ TI ULTRA-COMPACT MICROWAVE FILTERS USING KINETIC INDUCTANCE MICROSTRIP SO IEEE TRANSACTIONS ON MAGNETICS LA English DT Article; Proceedings Paper CT 1990 CONF ON APPLIED SUPERCONDUCTIVITY CY SEP 24-28, 1990 CL SNOWMASS, CO ID DELAY-LINES AB Multi-pole microwave filters have been designed and fabricated using microstrip transmission line sections which consist of two very thin films of sputtered niobium nitride (NbN) separated by another very thin film of sputtered Si. Since the thicknesses of all three films are much less than the superconducting penetration depth, the kinetic inductance is significantly greater than the magnetic inductance. As a result, the phase velocity of a microstrip transmission line is much less than the free space speed of light. Since resonant structures are reduced in size proportionately, the size and weight of microstrip circuits can be greatly reduced. Prototype filters consisting of four open circuited half-wavelength microstrip stubs separated by full-wavelength microstrip sections have been measured. The circuits are connected to 34 mil diameter coaxial cable via an intermediate coplanar waveguide section. Passbands of 4 GHz separated by 3 GHz reject bands have been measured in a structure which occupies less than 0.5 cm2 including the coplanar waveguide transitions. Higher-order passbands, although possessing an increased insertion loss, maintain filter passband characteristics through 20.0 GHz. RP POND, JM (reprint author), USN,RES LAB,MICROWAVE TECHNOL BRANCH,CODE 6850,WASHINGTON,DC 20375, USA. NR 5 TC 14 Z9 14 U1 1 U2 5 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0018-9464 J9 IEEE T MAGN JI IEEE Trans. Magn. PD MAR PY 1991 VL 27 IS 2 BP 2696 EP 2699 DI 10.1109/20.133768 PN 4 PG 4 WC Engineering, Electrical & Electronic; Physics, Applied SC Engineering; Physics GA EY654 UT WOS:A1991EY65400038 ER PT J AU GERSHENSON, M AF GERSHENSON, M TI DESIGN OF A HYSTERETIC SQUID AS THE READOUT FOR A DC SQUID SO IEEE TRANSACTIONS ON MAGNETICS LA English DT Article; Proceedings Paper CT 1990 CONF ON APPLIED SUPERCONDUCTIVITY CY SEP 24-28, 1990 CL SNOWMASS, CO ID PERFORMANCE AB This paper presents a novel design for an optimal hysteretic SQUID readout circuit for a DC SQUID, thus eliminating the need for bulky output transformers or resonance matching circuits. The hysteretic readout system, which is based in part on standard sampling theory, is compared to another similar1 system and shown to be superior in terms of slew rate and immunity to electromagnetic interference. The circuit will be useful in optimizing the performance of biomagnetic systems. RP GERSHENSON, M (reprint author), USN,CTR COASTAL SYST,PANAMA CITY,FL 32407, USA. NR 6 TC 4 Z9 4 U1 0 U2 0 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0018-9464 J9 IEEE T MAGN JI IEEE Trans. Magn. PD MAR PY 1991 VL 27 IS 2 BP 2910 EP 2912 DI 10.1109/20.133818 PN 4 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied SC Engineering; Physics GA EY654 UT WOS:A1991EY65400089 ER PT J AU SOULEN, RJ FOGLE, WE COLWELL, JH AF SOULEN, RJ FOGLE, WE COLWELL, JH TI SYSTEMATIC STUDIES OF THE EFFECT OF A BANDPASS FILTER ON A JOSEPHSON-JUNCTION NOISE THERMOMETER SO IEEE TRANSACTIONS ON MAGNETICS LA English DT Article; Proceedings Paper CT 1990 CONF ON APPLIED SUPERCONDUCTIVITY CY SEP 24-28, 1990 CL SNOWMASS, CO AB We present the results of an extensive study of the effect of a filter upon the performance of a resistive SQUID noise thermometer used to define an absolute temperature scale below 1 K. Agreement between the model for this effect and the experimental results indicates that the temperature scale defined by this noise thermometer is accurate to 0.1%. C1 USN,RES LAB,WASHINGTON,DC 20375. RP SOULEN, RJ (reprint author), NATL INST STAND & TECHNOL,GAITHERSBURG,MD 20899, USA. NR 5 TC 1 Z9 1 U1 0 U2 0 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0018-9464 J9 IEEE T MAGN JI IEEE Trans. Magn. PD MAR PY 1991 VL 27 IS 2 BP 2920 EP 2923 PN 4 PG 4 WC Engineering, Electrical & Electronic; Physics, Applied SC Engineering; Physics GA EY654 UT WOS:A1991EY65400092 ER PT J AU OPIE, D SCHONE, H HEIN, M MULLER, G PIEL, H WEHLER, D FOLEN, V WOLF, S AF OPIE, D SCHONE, H HEIN, M MULLER, G PIEL, H WEHLER, D FOLEN, V WOLF, S TI A SUPERCONDUCTING HYDROGEN MASER RESONATOR MADE FROM ELECTROPHORETIC YBA2CU3O7-DELTA SO IEEE TRANSACTIONS ON MAGNETICS LA English DT Article; Proceedings Paper CT 1990 CONF ON APPLIED SUPERCONDUCTIVITY CY SEP 24-28, 1990 CL SNOWMASS, CO AB A compact loop-gap hydrogen maser resonator has been constructed by electrophoretic deposition of YBa2Cu3O7-delta (YBCO) onto silver. The resonator is tuned to operate at the hyperfine transition frequency of hydrogen (1.42 GHz). This device is considered to be the first step towards a superconducting cavity for a compact hydrogen maser to be used in the Global Positioning System (GPS). The required miniaturization of the resonator reduces its Q value. This effect can be compensated for by the low surface resistance of YBCO at 77 K. Large and curved polycrystalline YBCO layers can be obtained by the electrophoretic deposition technique. In this contribution we report on the construction and the test of three loop-gap resonators which are prepared for the High Temperature Superconductor Space Experiment (HTSSE). The loop-gap electrodes are the lossiest parts of such a resonator. In a first step these electrodes with a surface of 150 cm2 were covered with YBCO. The Q values of the resonators at 77 K ranged between 2.3 10(4) and 3.1 10(4) and exceed the minimum requirement for a later maser application. They correspond to a surface resistance between 0.7 and 1.4 m-OMEGA which is a factor of 3 to 5 below the equivalent value of copper. The cavities can be excited in a higher order mode (HOM) at 4.3 GHz whose field distribution is still sensitive to the superconducting electrodes. Thus the experimental requirements for the HTSSE project can be fulfilled. C1 BERG UNIV WUPPERTAL,FACHBEREICH PHYS,W-5600 WUPPERTAL 1,GERMANY. USN,RES LAB,WASHINGTON,DC 20375. RP OPIE, D (reprint author), COLL WILLIAM & MARY,DEPT PHYS,WILLIAMSBURG,VA 23185, USA. NR 7 TC 5 Z9 5 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 0018-9464 J9 IEEE T MAGN JI IEEE Trans. Magn. PD MAR PY 1991 VL 27 IS 2 BP 2944 EP 2947 DI 10.1109/20.133826 PN 4 PG 4 WC Engineering, Electrical & Electronic; Physics, Applied SC Engineering; Physics GA EY654 UT WOS:A1991EY65400098 ER PT J AU GERSHENSON, M AF GERSHENSON, M TI DESIGN OF A FLUX BUFFER BASED ON THE FLUX SHUTTLE SO IEEE TRANSACTIONS ON MAGNETICS LA English DT Article; Proceedings Paper CT 1990 CONF ON APPLIED SUPERCONDUCTIVITY CY SEP 24-28, 1990 CL SNOWMASS, CO ID AMPLIFIER AB The design considerations for a flux buffer based on the flux-shuttle concept1 is discussed. Particular attention is given to the issues of flux popping, stability of operation and saturation levels for a large input. Modulation techniques used in order to minimize 1/f noise, in addition to offsets are also analyzed. Advantages over conventional approaches using a SQUID for a flux buffer are discussed. Results of computer simulations are presented. RP GERSHENSON, M (reprint author), USN,CTR COASTAL SYST,PANAMA CITY,FL 32407, USA. OI Gershenson, Meir/0000-0002-1318-3286 NR 5 TC 0 Z9 0 U1 0 U2 0 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0018-9464 J9 IEEE T MAGN JI IEEE Trans. Magn. PD MAR PY 1991 VL 27 IS 2 BP 2993 EP 2996 DI 10.1109/20.133840 PN 4 PG 4 WC Engineering, Electrical & Electronic; Physics, Applied SC Engineering; Physics GA EY654 UT WOS:A1991EY65400111 ER PT J AU GERSHENSON, M AF GERSHENSON, M TI HIGH-TEMPERATURE SUPERCONDUCTIVE FLUX GATE MAGNETOMETER SO IEEE TRANSACTIONS ON MAGNETICS LA English DT Article; Proceedings Paper CT 1990 CONF ON APPLIED SUPERCONDUCTIVITY CY SEP 24-28, 1990 CL SNOWMASS, CO AB A different type of HTS superconducting magnetometer based on the non-linear magnetic behavior of bulk HTS materials has been proposed and investigated. The device design is based on the generation of second harmonics which arise as a result of non-linear magnetization observed in Type-II superconductors. Even harmonics are generated from the non-linear interaction of an ac excitation signal with an external DC magnetic field which acts as a bias signal. RP GERSHENSON, M (reprint author), USN,CTR COASTAL SYST,PANAMA CITY,FL 32407, USA. OI Gershenson, Meir/0000-0002-1318-3286 NR 5 TC 6 Z9 6 U1 0 U2 1 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0018-9464 J9 IEEE T MAGN JI IEEE Trans. Magn. PD MAR PY 1991 VL 27 IS 2 BP 3055 EP 3057 DI 10.1109/20.133854 PN 4 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied SC Engineering; Physics GA EY654 UT WOS:A1991EY65400127 ER PT J AU KIRK, ECG BLAMIRE, MG SOMEKH, RE EVETTS, JE VANVECHTEN, D LOVELLETTE, MN AF KIRK, ECG BLAMIRE, MG SOMEKH, RE EVETTS, JE VANVECHTEN, D LOVELLETTE, MN TI ULTRA-HIGH QUALITY NB/ALOX/NB TUNNEL-JUNCTIONS WITH EPITAXIAL BASE LAYERS SO IEEE TRANSACTIONS ON MAGNETICS LA English DT Article; Proceedings Paper CT 1990 CONF ON APPLIED SUPERCONDUCTIVITY CY SEP 24-28, 1990 CL SNOWMASS, CO ID FABRICATION AB Using an ultra-high vacuum DC sputtering system we have fabricated Nb/AlO(x)/Nb tunnel junction devices with epitaxial Nb base layers. We have been investigating the improvements in device quality which can be achieved by heating the substrates during the growth of the tunnel barrier. By measuring the subgap characteristic under magnetic field at temperatures down to 0.4K, we show that for V < DELTA-Nb the currents in devices with critical current densities in the range 10(5)-10(6)Am-2 follow closely the BCS prediction and show no extrinsic leakage current. The divergence of the curve for higher current densities and at higher voltages is discussed. C1 USN,RES LAB,WASHINGTON,DC 20375. RP KIRK, ECG (reprint author), UNIV CAMBRIDGE,DEPT MAT SCI & MET,PEMBROKE ST,CAMBRIDGE CB2 3QZ,ENGLAND. NR 15 TC 12 Z9 12 U1 0 U2 2 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0018-9464 J9 IEEE T MAGN JI IEEE Trans. Magn. PD MAR PY 1991 VL 27 IS 2 BP 3137 EP 3140 DI 10.1109/20.133876 PN 4 PG 4 WC Engineering, Electrical & Electronic; Physics, Applied SC Engineering; Physics GA EY654 UT WOS:A1991EY65400148 ER PT J AU AMOS, RS LICHTENBERGER, AW FELDMAN, MJ MATTAUCH, RJ CUKAUSKAS, EJ AF AMOS, RS LICHTENBERGER, AW FELDMAN, MJ MATTAUCH, RJ CUKAUSKAS, EJ TI FABRICATION OF NBCN/PBBI EDGE JUNCTIONS WITH EXTREMELY LOW LEAKAGE CURRENTS SO IEEE TRANSACTIONS ON MAGNETICS LA English DT Article; Proceedings Paper CT 1990 CONF ON APPLIED SUPERCONDUCTIVITY CY SEP 24-28, 1990 CL SNOWMASS, CO ID JOSEPHSON AB We have fabricated high-quality submicron NbCN edge junctions using two separate plasma processes. A bilayer NbCN/SiO2 edge is cut with an ion gun, using a photoresist mask for each process. The first plasma technique involves lightly cleaning the bilayer surface with a low energy argon plasma which does not completely remove the thermally oxidized barrier formed after cutting the edge. The second technique involves a CF4/Ar plasma cleaning; the existing barrier is apparently beneficially modified by the plasma. These two methods have resulted in extremely high quality edge junctions with V(m)(3mV) > 150mV and 250mV respectively at 4.2K. These V(m)(3mV) figures are much higher than any reports for edge junctions of which we are aware. It was also unexpectedly found that the junction quality was not dependent on the ion beam voltage used to cut the bilayer edges for these thermally oxidized barriers, in strong contrast with our previous results with ion beam oxidation. C1 USN,RES LAB,WASHINGTON,DC 20375. RP AMOS, RS (reprint author), UNIV VIRGINIA,DEPT ELECT ENGN,CHARLOTTESVILLE,VA 22903, USA. NR 9 TC 1 Z9 1 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 0018-9464 J9 IEEE T MAGN JI IEEE Trans. Magn. PD MAR PY 1991 VL 27 IS 2 BP 3200 EP 3202 DI 10.1109/20.133892 PN 4 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied SC Engineering; Physics GA EY654 UT WOS:A1991EY65400164 ER PT J AU KENNEY, CS OVERFELT, PL AF KENNEY, CS OVERFELT, PL TI A SIMPLE APPROACH TO MODE ANALYSIS FOR PARABOLIC WAVE-GUIDES SO IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES LA English DT Article AB Difficulty in obtaining accurate values for parabolic cylinder functions has been an impediment to mode analysis for parabolic waveguides. A simple method, based on one-dimensional analytic continuation, is presented which gives essentially exact values for these functions; i.e., the relative error in the computed result is on the order of the machine round-off. When supplemented with a Newton-Poisson shooting method and simple homotopy techniques, this continuation method can be used to find the TE and TM mode eigenvalues, and associated separation constants, for arbitrary parabolic domains. These methods are then used to compute a power handling efficiency factor for a range of parabolic regions. C1 USN,CTR WEAP,DEPT RES,DIV PHYS,CHINA LAKE,CA 93555. RP KENNEY, CS (reprint author), UNIV CALIF SANTA BARBARA,DEPT ELECT & COMP ENGN,SANTA BARBARA,CA 93106, USA. NR 20 TC 3 Z9 3 U1 0 U2 0 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0018-9480 J9 IEEE T MICROW THEORY JI IEEE Trans. Microw. Theory Tech. PD MAR PY 1991 VL 39 IS 3 BP 405 EP 412 DI 10.1109/22.75281 PG 8 WC Engineering, Electrical & Electronic SC Engineering GA FB860 UT WOS:A1991FB86000004 ER PT J AU OVERFELT, P WHITE, DJ AF OVERFELT, P WHITE, DJ TI COMMENTS ON TE AND TM MODES OF SOME TRIANGULAR CROSS-SECTION WAVE-GUIDES USING SUPERPOSITION OF PLANE-WAVES - REPLY SO IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES LA English DT Letter RP OVERFELT, P (reprint author), USN,CTR WEAP,CHINA LAKE,CA 93555, USA. NR 1 TC 0 Z9 0 U1 0 U2 1 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0018-9480 J9 IEEE T MICROW THEORY JI IEEE Trans. Microw. Theory Tech. PD MAR PY 1991 VL 39 IS 3 BP 613 EP 613 PG 1 WC Engineering, Electrical & Electronic SC Engineering GA FB860 UT WOS:A1991FB86000042 ER PT J AU TUMMALA, M AF TUMMALA, M TI NEW ALGORITHM FOR SOLVING BLOCK MATRIX EQUATIONS WITH APPLICATIONS IN 2-D AR SPECTRAL ESTIMATION SO IEEE TRANSACTIONS ON SIGNAL PROCESSING LA English DT Letter ID TOEPLITZ MATRIX; INVERSION AB A new algorithm for solving block matrix equations is presented. The development is based upon some well-known matrix iterative techniques. The algorithm is first developed for the ideal case where the individual blocks in the autocorrelation matrix are Toeplitz, and is then extended to a more general least squares data formulation case. Simulation results of 2-D AR spectral estimation with quarter-plane support are presented. RP TUMMALA, M (reprint author), NAVAL POST GRAD SCH,DEPT ELECT & COMP ENGN,MONTEREY,CA 93943, USA. NR 9 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 1053-587X J9 IEEE T SIGNAL PROCES JI IEEE Trans. Signal Process. PD MAR PY 1991 VL 39 IS 3 BP 759 EP 764 DI 10.1109/78.80868 PG 6 WC Engineering, Electrical & Electronic SC Engineering GA EY891 UT WOS:A1991EY89100030 ER PT J AU WASHBURN, A AF WASHBURN, A TI STILL MORE ON PULLING THE GOALIE SO INTERFACES LA English DT Article ID MORRISON AB Once again the goalie is taken to task for staying in the game too long. This time dynamic programming is used to get around a questionable assumption made in previous analyses. RP WASHBURN, A (reprint author), USN,POSTGRAD SCH,MONTEREY,CA 93943, USA. NR 7 TC 12 Z9 12 U1 0 U2 2 PU INST OPERATIONS RESEARCH MANAGEMENT SCIENCES PI LINTHICUM HTS PA 901 ELKRIDGE LANDING RD, STE 400, LINTHICUM HTS, MD 21090-2909 SN 0092-2102 J9 INTERFACES JI Interfaces PD MAR-APR PY 1991 VL 21 IS 2 BP 59 EP 64 DI 10.1287/inte.21.2.59 PG 6 WC Management; Operations Research & Management Science SC Business & Economics; Operations Research & Management Science GA FJ162 UT WOS:A1991FJ16200007 ER PT J AU WYSOCKI, VH ROSS, MM AF WYSOCKI, VH ROSS, MM TI CHARGE-REMOTE FRAGMENTATION OF GAS-PHASE IONS - MECHANISTIC AND ENERGETIC CONSIDERATIONS IN THE DISSOCIATION OF LONG-CHAIN FUNCTIONALIZED ALKANES AND ALKENES SO INTERNATIONAL JOURNAL OF MASS SPECTROMETRY AND ION PROCESSES LA English DT Article ID FAST-ATOM BOMBARDMENT; TANDEM MASS-SPECTROMETRY; COLLISION-INDUCED DISSOCIATION; INTERNAL ENERGY; CHEMICAL IONIZATION; ORGANIC IONS; FATTY-ACIDS; METAL-IONS; ACTIVATION; DECOMPOSITIONS AB The collision-activated dissociation pathways of a number of long-chain functionalized alkane ions, CH3(CH2)nX+, and alkene ions have been examined by tandem mass spectrometry. Major dissociation pathways observed following collisional activation include the loss of C(n)H2n+2 units, the loss of C(n)H2n+1 units, the formation of C(n)H2n+1+, and the formation of X+ or XH+. Isotopic labelling data for [(CD3)3N(CD2)13CH3]+ show that no hydrogen/deuterium scrambling occurs between the charge site and the terminal methyl group for the losses of C(n)H2n+2 or C(n)H2n+1 from [(CH3)3N(CH2)13CH3]+. The collision energy required to detect charge-remote fragmentation in low-energy (electronvolt) collisional activation experiments was found to vary with compound type, ion formation method, mass of collision target, and target gas pressure. It is proposed that the dependence of the product distribution on the type of compound is caused by competition between charge-remote fragmentation and charge-directed processes such as the formation of C(n)H2n+1+ or the formation of X+ or XH+. A radical mechanism is proposed to account for several charge-remote dissociation pathways that cannot be accounted for by a previously proposed cyclic elimination mechanism. These processes include the loss of methane, the formation of odd- and even-electron product ions separated by 1 u, and the enhancement of certain dissociation products (e.g., allylic cleavage product ions) when unsaturation or substituent sites are introduced into the molecule. C1 USN,RES LAB,DIV MED,WASHINGTON,DC 20375. NR 64 TC 91 Z9 91 U1 0 U2 7 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-1176 J9 INT J MASS SPECTROM JI Int. J. Mass Spectrom. Ion Process. PD MAR 1 PY 1991 VL 104 IS 3 BP 179 EP 211 DI 10.1016/0168-1176(91)80009-C PG 33 WC Physics, Atomic, Molecular & Chemical; Spectroscopy SC Physics; Spectroscopy GA FB699 UT WOS:A1991FB69900002 ER PT J AU Oran, ES Boris, JP AF Oran, Elaine S. Boris, Jay P. TI Compressible Flow Simulations on a Massively Parallel Computer SO INTERNATIONAL JOURNAL OF MODERN PHYSICS C LA English DT Article AB This paper describes model development and computations of multidimensional, highly compressible, time-dependent reacting on a Connection Machine (CM). We briefly discuss computational timings compared to a Cray YMP speed, optimal use of the hardware and software available, treatment of boundary conditions, and parallel solution of terms representing chemical reactions. In addition, we show the practical use of the system for large-scale reacting and nonreacting flows. C1 [Oran, Elaine S.; Boris, Jay P.] Naval Res Lab, Lab Computat Phys & Fluid Dynam, Washington, DC 20375 USA. RP Oran, ES (reprint author), Naval Res Lab, Lab Computat Phys & Fluid Dynam, Washington, DC 20375 USA. FU Naval Research Laboratory through the Office of Naval Research; Advanced Computation and Mathematics Program in DARPA FX This work was funded by the Naval Research Laboratory through the Office of Naval Research and by the Advanced Computation and Mathematics Program in DARPA. The authors would like to thank Eugene Brown, Chiping Li, Ron Kolbe, Janet Ellzey, J. Michael Picone, and Robert Whaley, who have collaborated closely with the authors on various physics and computational aspects of these projects. NR 8 TC 0 Z9 0 U1 0 U2 0 PU WORLD SCIENTIFIC PUBL CO PTE LTD PI SINGAPORE PA 5 TOH TUCK LINK, SINGAPORE 596224, SINGAPORE SN 0129-1831 EI 1793-6586 J9 INT J MOD PHYS C JI Int. J. Mod. Phys. C PD MAR PY 1991 VL 2 IS 1 BP 430 EP 436 DI 10.1142/S0129183191303640 PG 7 WC Computer Science, Interdisciplinary Applications; Physics, Mathematical SC Computer Science; Physics GA V33NI UT WOS:000209025100064 ER PT J AU FETTERER, FM LAXON, S JOHNSON, DR AF FETTERER, FM LAXON, S JOHNSON, DR TI A COMPARISON OF GEOSAT ALTIMETER AND SYNTHETIC APERTURE RADAR MEASUREMENTS OVER EAST GREENLAND PACK ICE SO INTERNATIONAL JOURNAL OF REMOTE SENSING LA English DT Article ID SEA-ICE AB Altimetry over sea ice has attracted attention as a possible source of geophysical information. However, the interpretation of altimeter data records over ice has been hampered by a lack of high-resolution imagery for comparison. In this paper we compare Geosat altimeter data along a track over pack ice east of Greenland with coincident synthetic aperture radar data obtained as part of the marginal ice zone experiment (MIZEX-87). Fuzzy-cluster analysis of altimeter pulse echo parameters delineates the marginal ice zone, pack ice and fast ice. Results demonstrate the possibility of operational altimetry products for monitoring large-scale pack ice struture. RP FETTERER, FM (reprint author), USN,OCEANOG & ATMOSPHER RES LAB,REMOTE SENSING BRANCH,STENNIS SPACE CTR,MS 39529, USA. RI Laxon, Seymour/C-1644-2008 NR 24 TC 2 Z9 2 U1 0 U2 0 PU TAYLOR & FRANCIS LTD PI LONDON PA ONE GUNDPOWDER SQUARE, LONDON, ENGLAND EC4A 3DE SN 0143-1161 J9 INT J REMOTE SENS JI Int. J. Remote Sens. PD MAR PY 1991 VL 12 IS 3 BP 569 EP 583 PG 15 WC Remote Sensing; Imaging Science & Photographic Technology SC Remote Sensing; Imaging Science & Photographic Technology GA EZ885 UT WOS:A1991EZ88500016 ER PT J AU LEE, EW COOK, J KHAN, A MAHAPATRA, R WALDMAN, J AF LEE, EW COOK, J KHAN, A MAHAPATRA, R WALDMAN, J TI THE OXIDATION RESISTANCE OF MOSI2 COMPOSITES SO JOM-JOURNAL OF THE MINERALS METALS & MATERIALS SOCIETY LA English DT Article AB Recent work at the Naval Air Development Center demonstrates that the oxidation resistance of MoSi2 is not significantly reduced by XD(TM) compositing. The MoSi2 + SiC material exhibited an oxidation resistance equal to or better than that of base MoSi2. This excellent oxidation resistance, in conjunction with the enhanced high-temperature strength provided by XD particles, makes these materials highly attractive for use as future gas turbine engine materials. The problem of low room-temperature ductility and fracture toughness will be approached by incorporating other types of reinforcement phases. RP USN, CTR AIR DEV, WARMINSTER, PA 18974 USA. NR 11 TC 43 Z9 43 U1 0 U2 1 PU MINERALS METALS MATERIALS SOC PI WARRENDALE PA 184 THORN HILL RD, WARRENDALE, PA 15086 USA SN 1047-4838 J9 JOM-J MIN MET MAT S JI JOM-J. Miner. Met. Mater. Soc. PD MAR PY 1991 VL 43 IS 3 BP 54 EP 57 PG 4 WC Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering; Mineralogy; Mining & Mineral Processing SC Materials Science; Metallurgy & Metallurgical Engineering; Mineralogy; Mining & Mineral Processing GA FE981 UT WOS:A1991FE98100011 ER PT J AU MITCHELL, JM PAUL, BD WELCH, P CONE, EJ AF MITCHELL, JM PAUL, BD WELCH, P CONE, EJ TI FORENSIC DRUG-TESTING FOR OPIATES .2. METABOLISM AND EXCRETION RATE OF MORPHINE IN HUMANS AFTER MORPHINE ADMINISTRATION SO JOURNAL OF ANALYTICAL TOXICOLOGY LA English DT Article ID URINARY-EXCRETION; CODEINE; HEROIN AB Urine levels of free and total morphine were determined by GC/MS for four male subjects who received single doses of 20 mg of morphine sulfate intramuscularly. Peak concentrations were observed within 10 h for both conjugated and free morphine; thereafter, levels declined rapidly. Initially, free morphine represented from 25 to 34% of the total amount of morphine present, but this ratio declined after 12 h to an average of only 5.9% of total morphine. Free morphine accounted for an overall mean of 6.8% of the dose excreted in urine and conjugated morphine for 58.6%. The mean excretion half-life for free morphine was 6.6 h and for conjugated morphine was 8.2 h. The lower concentration and shorter half-life of free morphine resulted in a shorter detection time for free morphine versus total morphine at a 300-ng/mL cutoff. An equivalent detection time for free morphine was obtained when its cutoff was lowered to 25 ng/mL. The possibility that morphine is metabolized to codeine was unequivocally ruled out by the finding of an absence of codeine at or above the LOD of the GC/MS assay in all clinical specimens collected after morphine administration. C1 NIDA,ADDICT RES CTR,POB 5180,BALTIMORE,MD 21224. USN,DRUG SCREENING LAB,NORFOLK,VA 23511. NR 19 TC 30 Z9 32 U1 0 U2 7 PU PRESTON PUBLICATIONS INC PI NILES PA 7800 MERRIMAC AVE PO BOX 48312, NILES, IL 60648 SN 0146-4760 J9 J ANAL TOXICOL JI J. Anal. Toxicol. PD MAR-APR PY 1991 VL 15 IS 2 BP 49 EP 53 PG 5 WC Chemistry, Analytical; Toxicology SC Chemistry; Toxicology GA FC710 UT WOS:A1991FC71000001 PM 2051744 ER PT J AU JONKER, BT PRINZ, GA AF JONKER, BT PRINZ, GA TI AUGER-ELECTRON DIFFRACTION STUDY OF THE GROWTH OF FE(001) FILMS ON ZNSE(001) SO JOURNAL OF APPLIED PHYSICS LA English DT Article ID MOLECULAR-BEAM-EPITAXY; PASSIVATION; REGROWTH AB The growth of Fe films on ZnSe(001) epilayers and bulk GaAs(001) substrates has been studied to determine the mode of film growth, the formation of the interface, and the structure of the overlayer at the 1-10 monolayer level. Auger electron diffraction (AED), x-ray photoelectron spectroscopy (XPS), and reflection high-energy electron diffraction data are obtained for incremental deposition of the Fe(001) overlayer. The coverage dependence of the AED forward scattering peaks reveals a predominantly layer-by-layer mode of film growth at 175-degrees-C on ZnSe, while a more three-dimensional growth mode occurs on the oxide-desorbed GaAs(001) substrate. XPS studies of the semiconductor 3d levels indicate that the Fe/ZnSe interface is less reactive than the Fe/GaAs interface. RP JONKER, BT (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 12 TC 21 Z9 21 U1 0 U2 1 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0021-8979 J9 J APPL PHYS JI J. Appl. Phys. PD MAR 1 PY 1991 VL 69 IS 5 BP 2938 EP 2941 DI 10.1063/1.348604 PG 4 WC Physics, Applied SC Physics GA FA705 UT WOS:A1991FA70500025 ER PT J AU MCKIRNAN, MD GRAY, CG WHITE, FC AF MCKIRNAN, MD GRAY, CG WHITE, FC TI EFFECTS OF FEEDING ON MUSCLE BLOOD-FLOW DURING PROLONGED EXERCISE IN MINIATURE SWINE SO JOURNAL OF APPLIED PHYSIOLOGY LA English DT Article DE HEMODYNAMICS; REGIONAL BLOOD FLOW; SPLANCHNIC BLOOD FLOW; THERMOREGULATION AND OXYGEN CONSUMPTION ID CONSCIOUS DOG; VASCULAR-RESPONSES; DIGESTION; HEMODYNAMICS; CORONARY AB Eight exercise-trained miniature swine were studied during prolonged treadmill runs (100 min) under fasting and preexercise feeding conditions. Each animal ran at identical external work loads that corresponded to 65% of the heart rate reserve (210-220 beats/min) for the two exercise bouts. Cardiac outputs and stroke volumes were higher and heart rates lower for fed than for fasting runs (P < 0.05). Preexercise feeding did not alter oxygen consumption, core temperature, mean arterial pressure, and arterial-mixed venous oxygen difference during prolonged exercise; however, mixed venous lactate concentration was lower at end exercise than during fasting conditions (1.2 vs. 2.6 mM, P < 0.05). Microsphere measurements of regional blood flow revealed significantly higher total gastrointestinal flow (23%) for fed than for fasting conditions. Throughout the exercise bout, blood flow to the biceps femoris, semitendinosus, and tibialis anterior muscles was lower in fed than in fasted animals (P < 0.05). Combined hindlimb muscle blood flow averaged 15 ml.min-1.100 g-1 (18%, P < 0.05) lower under feeding than fasting run conditions. These findings provide further evidence that cardiovascular reflexes originate in the gut after feeding to increase cardiac output and redistribute a portion of the blood flow away from active muscle to the gastrointestinal tract during prolonged exercise. C1 USN HOSP,DEPT CLIN INVEST,SAN DIEGO,CA 92134. RP MCKIRNAN, MD (reprint author), UNIV CALIF SAN DIEGO,SCH MED,DEPT PATHOL 0612,LA JOLLA,CA 92093, USA. FU NHLBI NIH HHS [HL-32670] NR 37 TC 12 Z9 12 U1 2 U2 2 PU AMER PHYSIOLOGICAL SOC PI BETHESDA PA 9650 ROCKVILLE PIKE, BETHESDA, MD 20814 SN 8750-7587 J9 J APPL PHYSIOL JI J. Appl. Physiol. PD MAR PY 1991 VL 70 IS 3 BP 1097 EP 1104 PG 8 WC Physiology; Sport Sciences SC Physiology; Sport Sciences GA FA971 UT WOS:A1991FA97100019 PM 2032975 ER PT J AU LEWIS, PAW MCKENZIE, E AF LEWIS, PAW MCKENZIE, E TI MINIFICATION PROCESSES AND THEIR TRANSFORMATIONS SO JOURNAL OF APPLIED PROBABILITY LA English DT Article DE TIME SERIES; EAR(1); TRANSFORMATIONS; MAXIMUM PROCESS ID TIME-SERIES; MODELS AB It is shown that the stationary, autoregressive, Markovian minification processes introduced by Tavers and Sim can be extended to give processes with marginal distributions other than the exponential and Weibull distributions. Necessary and sufficient conditions on the hazard rate of the marginal distributions are given for a minification process to exist. Results are given for the derivation of the autocorrelation function; these correct the expression for the Weibull given by Sim. Monotonic transformations of the minification processes are also discussed and generate a whole new class of autoregressive processes with fixed marginal distributions. Stationary processes generated by a maximum operation are also introduced and a comparison of three different Markovian processes with uniform marginal distributions is given. C1 UNIV STRATHCLYDE,DEPT STAT,GLASGOW G1 1XW,SCOTLAND. RP LEWIS, PAW (reprint author), USN,POSTGRAD SCH,DEPT OPERAT RES,MONTEREY,CA 93940, USA. NR 10 TC 30 Z9 30 U1 0 U2 2 PU APPLIED PROBABILITY TRUST PI SHEFFIELD PA THE UNIVERSITY DEPT PROB AND STATISTICS, SHEFFIELD, ENGLAND S3 7RH SN 0021-9002 J9 J APPL PROBAB JI J. Appl. Probab. PD MAR PY 1991 VL 28 IS 1 BP 45 EP 57 DI 10.2307/3214739 PG 13 WC Statistics & Probability SC Mathematics GA FC861 UT WOS:A1991FC86100005 ER PT J AU ZIMMERMAN, JA EYLER, JR BACH, SBH MCELVANY, SW AF ZIMMERMAN, JA EYLER, JR BACH, SBH MCELVANY, SW TI MAGIC NUMBER CARBON CLUSTERS - IONIZATION-POTENTIALS AND SELECTIVE REACTIVITY SO JOURNAL OF CHEMICAL PHYSICS LA English DT Article ID CN ABUNDANCE DISTRIBUTIONS; SYMMETRICAL CLUSTERS; ELECTRONIC-STRUCTURE; LASER VAPORIZATION; C-60; BUCKMINSTERFULLERENE; IONS; SHELLS; PHOTOPHYSICS; FOLLENE-60 AB The ionization potentials (IPs) of several large carbon clusters C(n) (n greater-than-or-equal-to 48), including the enhanced abundance ("magic number") clusters C50, C60, and C70, have determined by Fourier transform ion cyclotron resonance (FTICR) mass spectrometric charge transfer bracketing experiments. The IPs of C50, C60, and C70 were bracketed by the same two charge transfer compounds, leading to a common value of 7.61 +/- 0.11 eV. The IPs of even numbered clusters adjacent to these magic number clusters were found to be lower by as much as 0.5 eV and all clusters between C50 and C200 were determined to have IPs greater than 6.20 eV. The reaction rates of C60+ and C70+ with metallocenes were anomalously slow in comparison to the other large carbon cluster ions. IP and reactivity results suggest that C50, C60, and C70 may indeed have different or more stable structures than neighboring clusters, which supports the hypothesis of closed-shell, spherical species. The implications of these results for the mechanism of C(n)+ formation by direct laser vaporization are also discussed. C1 UNIV FLORIDA,DEPT CHEM,GAINESVILLE,FL 32611. USN,RES LAB,DIV CHEM,WASHINGTON,DC 20375. RI Bach, Stephan/B-7496-2009 NR 54 TC 222 Z9 224 U1 2 U2 11 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0021-9606 J9 J CHEM PHYS JI J. Chem. Phys. PD MAR 1 PY 1991 VL 94 IS 5 BP 3556 EP 3562 DI 10.1063/1.459778 PG 7 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA FA778 UT WOS:A1991FA77800029 ER PT J AU ZUK, WM WARD, KB AF ZUK, WM WARD, KB TI METHODS OF ANALYSIS OF PROTEIN CRYSTAL IMAGES SO JOURNAL OF CRYSTAL GROWTH LA English DT Article ID PICTURES AB Several protein crystallization techniques, including the vapor diffusion method, lend themselves well to automation techniques. Up unitl the present time, automation techniques have been restricted to setting up crystallization experiments, and procedures to monitor and analyze the experiments have not been developed. These procedures require additional hardware for video monitoring of crystallization chambers and automatic recognition of protein crystals. An automated image acquisition and analysis system makes use of both image processing routines and pattern recognition procedures. In order to design and implement such a system, we are presently developing algorithms which can recognize and locate protein crystals in video images of crystallization droplets. Images of crystallization experiments are acquired and digitized, and analyses of the droplet images are conducted on the microcomputer which also acts as a host in our laboratory robotics system. We describe here our current progress in designing the image analysis system, including the development of appropriate pattern recognition methods. In addition, the usefulness of various pattern recognition schemes for monitoring the progress of crystallization is explored. RP ZUK, WM (reprint author), USN,RES LAB,STRUCT MATTER LAB,WASHINGTON,DC 20375, USA. NR 14 TC 21 Z9 21 U1 0 U2 2 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0022-0248 J9 J CRYST GROWTH JI J. Cryst. Growth PD MAR PY 1991 VL 110 IS 1-2 BP 148 EP 155 DI 10.1016/0022-0248(91)90878-9 PG 8 WC Crystallography; Materials Science, Multidisciplinary; Physics, Applied SC Crystallography; Materials Science; Physics GA FF694 UT WOS:A1991FF69400020 ER PT J AU WEBB, RE JOHNSTON, AD AF WEBB, RE JOHNSTON, AD TI DENTIN-BONDING MOLAR EFFICIENCY USING N-PHENYLGLYCINE, N-PHENYL-BETA-ALANINE, OR N-METHYL-N-PHENYLGLYCINE SO JOURNAL OF DENTAL RESEARCH LA English DT Article ID HARD TOOTH TISSUES; ADHESIVE; SYSTEM AB Three structurally related substituted amino acids (N-compounds) were studied in a three-step dentin-bonding protocol. The first step of an acidic ferric oxalate solution and the third step of a surface-active comonomer were held constant throughout the study. In the second step, the amount of the N-compound-either N-phenylglycine (NPG), N-methyl-N-phenylglycine (NMNPG), or N-phenyl-beta-alanine (NPBA)-was varied in acetone from 0 mol/L through 5 x 10-1 mol/L in seven steps. At 1 x 10-3 mol/L for NPG and NMNPG, average bond strength values were 7.4 +/- 2.2 and 10.5 +/- 2.7 MPa. The highest bond strength value for NMNPG was at 1 x 10-2 mol/L, with 13.2 +/- 4.0 MPa. The highest value for NPG was at 1 x 10-1 mol/L, with a value of 11.8 +/- 2.5 MPa. The average bond strength for NPBA did not differ from zero across the entire range of concentrations. Molar efficiency was defined as the bond strength per mole of these applied N-compounds. For the two N-compounds that did provide adhesion to dentin, NPG and NMNPG, the average bond strengths rose, peaked, and fell as the amounts of applied N-compound were increased. The molar efficiency dropped off as the concentration of applied N-compound rose. The least operator-sensitive and most efficient N-compound, NMNPG, delivered a bond strength equivalent to that of NPG, with 10% of the applied NPG amount. C1 NATL INST STAND & TECHNOL,AMER DENT ASSOC,PAFFENBARGER RES CTR,GAITHERSBURG,MD 20899. RP WEBB, RE (reprint author), USN,SCH DENT,NNDC,BETHESDA,MD 20814, USA. FU NIDCR NIH HHS [DE05129, DE09322] NR 14 TC 9 Z9 9 U1 0 U2 0 PU AMER ASSOC DENTAL RESEARCH PI ALEXANDRIA PA 1619 DUKE ST, ALEXANDRIA, VA 22314 SN 0022-0345 J9 J DENT RES JI J. Dent. Res. PD MAR PY 1991 VL 70 IS 3 BP 211 EP 214 DI 10.1177/00220345910700031101 PG 4 WC Dentistry, Oral Surgery & Medicine SC Dentistry, Oral Surgery & Medicine GA FD585 UT WOS:A1991FD58500011 PM 1999561 ER PT J AU CHANG, LW HAMILTON, JF AF CHANG, LW HAMILTON, JF TI THE KINEMATICS OF ROBOTIC MANIPULATORS WITH FLEXIBLE LINKS USING AN EQUIVALENT RIGID LINK SYSTEM (ERLS) MODEL SO JOURNAL OF DYNAMIC SYSTEMS MEASUREMENT AND CONTROL-TRANSACTIONS OF THE ASME LA English DT Article ID CONTROL EQUATIONS; DYNAMICS AB The Equivalent Rigid Link System (ERLS) is presented for the analysis of the kinematics of manipulators with flexible links. The concept of the ERLS is to separate the rigid-body dynamics and structural dynamics. The global motion of the flexible-link system is thereby separated into a large motion with a superimposed small motion. The large motion is represented by the ERLS and the small motion is due to the deviations with respect to the ERLS. The complete motion of manipulators is described by homogeneous transformations. The Jacobian and inverse kinematics are also presented in this paper. C1 USN,POSTGRAD SCH,DEPT MECH ENGN,MONTEREY,CA 93943. PURDUE UNIV,SCH MECH ENGN,W LAFAYETTE,IN 47907. NR 16 TC 15 Z9 16 U1 0 U2 1 PU ASME-AMER SOC MECHANICAL ENG PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 SN 0022-0434 J9 J DYN SYST-T ASME JI J. Dyn. Syst. Meas. Control-Trans. ASME PD MAR PY 1991 VL 113 IS 1 BP 48 EP 53 DI 10.1115/1.2896358 PG 6 WC Automation & Control Systems; Instruments & Instrumentation SC Automation & Control Systems; Instruments & Instrumentation GA HQ743 UT WOS:A1991HQ74300009 ER PT J AU CHANG, LW HAMILTON, JF AF CHANG, LW HAMILTON, JF TI DYNAMICS OF ROBOTIC MANIPULATORS WITH FLEXIBLE LINKS SO JOURNAL OF DYNAMIC SYSTEMS MEASUREMENT AND CONTROL-TRANSACTIONS OF THE ASME LA English DT Article AB This paper presents a dynamic model for the robotic manipulators with flexible links by means of the Finite Element Method and Lagrange's formulation. By the concept of the Equivalent Rigid Link System (ERLS), the generalized coordinates are selected to represent the total motion as a large motion and a small motion. Two sets of coupled nonlinear equations are obtained where the equations representing small motions are linear with respect to the small motion variables. An example is presented to illustrate the importance of the flexibility effects. C1 USN, POSTGRAD SCH, DEPT MECH ENGN, MONTEREY, CA 93943 USA. PURDUE UNIV, DEPT MECH ENGN, W LAFAYETTE, IN 47907 USA. NR 16 TC 21 Z9 22 U1 0 U2 2 PU ASME PI NEW YORK PA TWO PARK AVE, NEW YORK, NY 10016-5990 USA SN 0022-0434 EI 1528-9028 J9 J DYN SYST-T ASME JI J. Dyn. Syst. Meas. Control-Trans. ASME PD MAR PY 1991 VL 113 IS 1 BP 54 EP 59 DI 10.1115/1.2896359 PG 6 WC Automation & Control Systems; Instruments & Instrumentation SC Automation & Control Systems; Instruments & Instrumentation GA HQ743 UT WOS:A1991HQ74300010 ER PT J AU HULL, AJ RADCLIFFE, CJ MACCLUER, CR AF HULL, AJ RADCLIFFE, CJ MACCLUER, CR TI STATE ESTIMATION OF THE NONSELF-ADJOINT ACOUSTIC DUCT SYSTEM SO JOURNAL OF DYNAMIC SYSTEMS MEASUREMENT AND CONTROL-TRANSACTIONS OF THE ASME LA English DT Article ID ACTIVE CONTROL; FINITE LENGTH; SOUND; NOISE AB The acoustic response of a hard walled duct with a partially absorptive boundary condition has been modeled in state space form. The system states of this model are not directly measurable. An observer is developed to obtain the state estimates. Numerical simulations are presented and convergence of the observer is discussed. Different integration schemes are compared and comments are made for eventual real time application. C1 USN,CTR UNDERWATER SYST,DEPT SUBMARINE SONAR,NEW LONDON,CT 06320. MICHIGAN STATE UNIV,DEPT MECH ENGN,E LANSING,MI 48824. MICHIGAN STATE UNIV,DEPT MATH,E LANSING,MI 48824. NR 18 TC 5 Z9 5 U1 0 U2 1 PU ASME-AMER SOC MECHANICAL ENG PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 SN 0022-0434 J9 J DYN SYST-T ASME JI J. Dyn. Syst. Meas. Control-Trans. ASME PD MAR PY 1991 VL 113 IS 1 BP 122 EP 126 DI 10.1115/1.2896337 PG 5 WC Automation & Control Systems; Instruments & Instrumentation SC Automation & Control Systems; Instruments & Instrumentation GA HQ743 UT WOS:A1991HQ74300019 ER PT J AU CHANG, LW HAMILTON, JF AF CHANG, LW HAMILTON, JF TI SIMULATION OF FLEXIBLE-LINK MANIPULATORS APPLYING SEQUENTIAL INTEGRATION METHOD SO JOURNAL OF DYNAMIC SYSTEMS MEASUREMENT AND CONTROL-TRANSACTIONS OF THE ASME LA English DT Note AB The Equivalent Rigid Link System (ERLS) dynamic model offered a complete representation for the dynamics of flexible manipulators. The equations of motion were separated into a nonlinear large motion and a linear small motion. In this paper, a sequential integration method facilitates the solution of the system equations. This method integrates the large (slow) motion equation explicitly and integrates the small (fast) motion equation implicitly. The simulation results are presented to show the computation efficiency and the flexibility effects. C1 USN,POSTGRAD SCH,DEPT MECH ENGN,MONTEREY,CA 93943. PURDUE UNIV,SCH MECH ENGN,W LAFAYETTE,IN 47907. NR 6 TC 0 Z9 0 U1 0 U2 0 PU ASME-AMER SOC MECHANICAL ENG PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 SN 0022-0434 J9 J DYN SYST-T ASME JI J. Dyn. Syst. Meas. Control-Trans. ASME PD MAR PY 1991 VL 113 IS 1 BP 175 EP 178 DI 10.1115/1.2896346 PG 4 WC Automation & Control Systems; Instruments & Instrumentation SC Automation & Control Systems; Instruments & Instrumentation GA HQ743 UT WOS:A1991HQ74300028 ER PT J AU PATTON, JS AF PATTON, JS TI FIRE AND SMOKE CORROSIVITY OF METALS SO JOURNAL OF FIRE SCIENCES LA English DT Article AB The deleterious effects that combustion products, generated during fires, can have on normal construction materials has been well documented. The combined effects of fire, corrosive smoke and particulate have been defined as fire corrosivity. While the effects of fire corrosivity are well known little quantitative information is available concerning the mechanisms involved and the degree to which materials, particularly, metals are susceptible to this attack. Consequently, a study was conducted to begin examining the effects of fire and smoke corrosion on metals. Various metal targets were exposed to corrosive smoke and fire particulate produced from Polyvinylchloride (PVC) samples burned in a cone calorimeter. The target materials consisted of 304 stainless steel, 1010 carbon steel and 70-30 Cu-Ni alloy. In addition to metal targets, electrical resistance probes were also utilized in the testing to monitor in-situ corrosion. The probe materials corresponded to the metal targets so that a comparison could be conducted. The corrosion probes offer the capability of instantaneously comparing results from similar tests and to conduct in-situ measurements of corrosion rates during a test. After testing, both the metal targets and corrosion probes were sectioned and prepared for analysis using standard metallographic techniques. The targets and probes were analyzed for corrosion products and depth of attack. As a result of this test it was shown that all the metal targets test proved highly susceptible to the effects of smoke corrosivity attributed to the burning of PVC samples. These results are presented and compared by corrosion rates. In addition, the performance of the corrosion probes in terms of their ability to produce accurate corrosion measurements were evaluated by comparing their corrosion depth measurements to those of the metal targets. RP PATTON, JS (reprint author), USN,DAVID TAYLOR RES CTR,CODE 2813,ANNAPOLIS,MD 21402, USA. NR 3 TC 4 Z9 4 U1 0 U2 0 PU TECHNOMIC PUBL CO INC PI LANCASTER PA 851 NEW HOLLAND AVE, BOX 3535, LANCASTER, PA 17604 SN 0734-9041 J9 J FIRE SCI JI J. Fire Sci. PD MAR-APR PY 1991 VL 9 IS 2 BP 149 EP 161 DI 10.1177/073490419100900204 PG 13 WC Engineering, Multidisciplinary; Materials Science, Multidisciplinary SC Engineering; Materials Science GA GV596 UT WOS:A1991GV59600004 ER PT J AU WALKER, DN CHATURVEDI, PK SINGH, M RODRIGUEZ, P SIEFRING, CL BAUMBACK, MM AF WALKER, DN CHATURVEDI, PK SINGH, M RODRIGUEZ, P SIEFRING, CL BAUMBACK, MM TI LOW-FREQUENCY OSCILLATIONS ASSOCIATED WITH A POLAR-CAP AURORAL ARC - LOCAL SPECTRAL DENSITY-ESTIMATION SO JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS LA English DT Article ID ION-CYCLOTRON WAVES; F-REGION; ELECTROSTATIC-WAVES; PLASMA; IRREGULARITIES; IONOSPHERE; INSTABILITY; PROBE AB Enhanced low-frequency electrostatic oscillations measured from a rocket in the high-latitude upper F region during the crossing of a polar cap auroral arc are analyzed using local spectral analysis techniques. The turbulent spectra were reduced from measurements made by Langmuir probes whose orientation remained approximately perpendicular to B throughout the flight. The increased low-frequency turbulence appears at an altitude of 400 km, coincident with electrostatic analyzer indications of increased energetic particle flux. Langmuir probe measurements simultaneously show an increasing temperature and generally decreasing, although irregular, electron density profiles. Electrostatic wave data are analyzed using cross-correlation analysis to determine phase shift; local wave number approximations provide an estimate of the plasma wave spectral density, S(k, omega). Theoretical expectations for threshold excitation and growth rates of possible instabilities in a two-component high-latitude F region ionosphere are investigated. The most likely source for the measured oscillations appears to be excitation of a collisionless electrostatic ion cyclotron mode. RP WALKER, DN (reprint author), USN,RES LAB,DIV PLASMA PHYS,SPACE PLASMA BRANCH,WASHINGTON,DC 20375, USA. NR 31 TC 2 Z9 2 U1 0 U2 2 PU AMER GEOPHYSICAL UNION PI WASHINGTON PA 2000 FLORIDA AVE NW, WASHINGTON, DC 20009 SN 0148-0227 J9 J GEOPHYS RES JI J. Geophys. Res-Space Phys. PD MAR 1 PY 1991 VL 96 IS A3 BP 3589 EP 3600 DI 10.1029/90JA02182 PG 12 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA FA247 UT WOS:A1991FA24700015 ER PT J AU COYLE, HM UNGARO, R AF COYLE, HM UNGARO, R TI IMPROVED DESIGN PROCEDURES FOR VERTICALLY LOADED H-PILES IN SAND SO JOURNAL OF GEOTECHNICAL ENGINEERING-ASCE LA English DT Article AB This paper summarizes the results of a study conducted to improve design procedures for vertically loaded H-piles in cohesionless soils. Included in the study is the examination of several procedures for estimating residual loads and assumptions concerning the plugging phenomena that may occur between the flanges of an H-pile. Data obtained from full-scale load tests reported in the literature are used to develop the improved design procedures. The improved procedures include a procedure for estimating ultimate bearing capacity and a procedure for developing load-versus-settlement relationships for H-piles in sand. Load-test results from two H-piles that are not part of the data base are included to demonstrate the use of the improved design procedures. The predictions made for these two H-piles using the improved design procedures are closer to the measured load-settlement values than predictions made using existing design methods. C1 USN,UNDERWATER CONSTRUCT TEAM 2,CBC,PORT HUENEME,CA 93043. RP COYLE, HM (reprint author), TEXAS A&M UNIV SYST,CIVIL ENGN,COLLEGE STN,TX 77843, USA. NR 17 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 0733-9410 J9 J GEOTECH ENG-ASCE JI J. Geotech. Eng.-ASCE PD MAR PY 1991 VL 117 IS 3 BP 507 EP 528 DI 10.1061/(ASCE)0733-9410(1991)117:3(507) PG 22 WC Engineering, Civil; Geosciences, Multidisciplinary SC Engineering; Geology GA EY766 UT WOS:A1991EY76600007 ER PT J AU KIRSHENBAUM, AS KESSLER, SW GOFF, JP METCALFE, DD AF KIRSHENBAUM, AS KESSLER, SW GOFF, JP METCALFE, DD TI DEMONSTRATION OF THE ORIGIN OF HUMAN MAST-CELLS FROM CD34+ BONE-MARROW PROGENITOR CELLS SO JOURNAL OF IMMUNOLOGY LA English DT Article ID BASOPHIL-LIKE CELLS; COMMITTED PROGENITOR; HEMATOPOIETIC-CELLS; DIFFERENTIATION; FIBROBLASTS; INVITRO; PROLIFERATION; INTERLEUKIN-3; MICE; GRANULOCYTES AB It has been established that murine mast cells are derived from a pluripotent bone marrow stem cell. In humans, the corresponding pluripotent cell is included in the CD34+ bone marrow population. To determine whether human mast cells arise from CD34+ human progenitor cells, enriched CD34+ cells were cultured over agarose surfaces (interphase cultures) or cocultured with mouse 3T3 fibroblasts in the presence of recombinant human (rh) IL-3. The presence of both mast cells and basophils was determined using a variety of histochemical and immunohistologic techniques, including immunogold labeling for IgE receptors and mast cell tryptase. Mast cells and basophils continued to appear in cultures when T cell, B cell, macrophage, and eosinophil committed progenitor cells were removed, but were not seen in cultures from which CD34+ cells were removed. CD34+ cells layered over agarose in the presence of rhIL-3 were shown to give rise to cultures that contained mast cells (1 to 5%) and basophils (25 to 40%). Cultures supplemented with rhIL-4 showed no additional increase in mast cells or basophils. CD34+ cells cocultured with 3T3 fibroblasts in the presence of rhIL-3 gave rise to mast cells within the fibroblast monolayer, which by 6 wk comprised up to 46% of the monolayer. CD34- cells on 3T3 fibroblasts gave rise to few mast cells (2% of the monolayer). Mast cell granules from interphase cultures contained homogeneous electron-dense material. In contrast, mast cells within 3T3 monolayers at 6 wk contained a variety of granule morphologies, including scroll, mixed, reticular, dense core, or homogeneous patterns. We conclude that both human mast cells and basophils arise from CD34+ human progenitor cells. C1 GEORGETOWN UNIV,MED CTR,DIV MOLEC VIROL & IMMUNOL,ROCKVILLE,MD 20852. HOMEWOOD HOSP,DEPT MED,DIV ALLERGY,BALTIMORE,MD 21211. USN,MED RES INST,DEPT IMMUNOL & TRANSPLANTAT,BETHESDA,MD 20889. RP KIRSHENBAUM, AS (reprint author), NIAID,LCI,MAST CELL PHYSIOL SECT,BLDG 10,ROOM 11C212,BETHESDA,MD 20892, USA. NR 31 TC 279 Z9 283 U1 0 U2 4 PU AMER ASSOC IMMUNOLOGISTS PI BETHESDA PA 9650 ROCKVILLE PIKE, BETHESDA, MD 20814 SN 0022-1767 J9 J IMMUNOL JI J. Immunol. PD MAR 1 PY 1991 VL 146 IS 5 BP 1410 EP 1415 PG 6 WC Immunology SC Immunology GA EY684 UT WOS:A1991EY68400004 PM 1704394 ER PT J AU NEED, JT ESCAMILLA, J AF NEED, JT ESCAMILLA, J TI LYME-DISEASE IN SOUTH-AMERICA SO JOURNAL OF INFECTIOUS DISEASES LA English DT Letter ID IXODIDAE; ACARI RP NEED, JT (reprint author), USN,MED RES INST DETACHMENT,DEPT MED ENTOMOL,MIAMI,FL 34031, USA. NR 10 TC 9 Z9 11 U1 0 U2 0 PU UNIV CHICAGO PRESS PI CHICAGO PA 5720 S WOODLAWN AVE, CHICAGO, IL 60637 SN 0022-1899 J9 J INFECT DIS JI J. Infect. Dis. PD MAR PY 1991 VL 163 IS 3 BP 681 EP 682 PG 2 WC Immunology; Infectious Diseases; Microbiology SC Immunology; Infectious Diseases; Microbiology GA EY495 UT WOS:A1991EY49500053 PM 1995748 ER PT J AU SUN, CK WU, CC CHANG, CT YU, PKL MCKNIGHT, WH AF SUN, CK WU, CC CHANG, CT YU, PKL MCKNIGHT, WH TI A BRIDGE TYPE OPTOELECTRONIC SAMPLE AND HOLD CIRCUIT SO JOURNAL OF LIGHTWAVE TECHNOLOGY LA English DT Article AB A novel bridge type optoelectronic (OE) sample and hold circuit based upon current steering is proposed for the first time and is experimentally tested. Experimental comparison between this circuit and the conventional direct OE sample and hold circuit shows that the bridge type is clearly superior in performance to the direct OE circuit. When a high-speed signal is sampled with high accuracy, the bridge type OE sample and hold circuit offers high charging capability, commanding signal isolation, and reduced time jitter, distinct advantages over electronic sample and hold circuits. C1 UNIV CALIF SAN DIEGO,DEPT ELECT & COMP ENGN,LA JOLLA,CA 92093. USN,CTR OCEAN SYST,SAN DIEGO,CA 92152. TAIPEI MUNICIPAL TEACHERS COLL,CTR SCI EDUC,TAIPEI,TAIWAN. RP SUN, CK (reprint author), SAN DIEGO STATE UNIV,DEPT ELECT & COMP ENGN,SAN DIEGO,CA 92182, USA. NR 10 TC 6 Z9 7 U1 0 U2 0 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0733-8724 J9 J LIGHTWAVE TECHNOL JI J. Lightwave Technol. PD MAR PY 1991 VL 9 IS 3 BP 341 EP 346 DI 10.1109/50.70010 PG 6 WC Engineering, Electrical & Electronic; Optics; Telecommunications SC Engineering; Optics; Telecommunications GA EZ445 UT WOS:A1991EZ44500008 ER PT J AU KOFORD, KJ MILLER, JB AF KOFORD, KJ MILLER, JB TI THE NATURAL RATE AND ADJUSTMENT TO SHOCKS IN AN EFFICIENCY-WAGE SHARE ECONOMY SO JOURNAL OF MACROECONOMICS LA English DT Article ID EQUILIBRIUM UNEMPLOYMENT C1 USN ACAD,ANNAPOLIS,MD 21402. RP KOFORD, KJ (reprint author), UNIV DELAWARE,NEWARK,DE 19711, USA. NR 27 TC 3 Z9 3 U1 0 U2 4 PU LOUISIANA STATE UNIV PR PI BATON ROUGE PA BATON ROUGE, LA 70893 SN 0164-0704 J9 J MACROECON JI J. Macroecon. PD SPR PY 1991 VL 13 IS 2 BP 299 EP 316 DI 10.1016/0164-0704(91)90058-3 PG 18 WC Economics SC Business & Economics GA FH184 UT WOS:A1991FH18400006 ER PT J AU RAYNE, RJ TOTH, LE BENDER, BA LAWRENCE, SH MILLER, MM SOULEN, RJ CANDELLA, G AF RAYNE, RJ TOTH, LE BENDER, BA LAWRENCE, SH MILLER, MM SOULEN, RJ CANDELLA, G TI CASTING AND MACHINING OF DEVICES OF HIGH-TEMPERATURE SUPERCONDUCTING BSCCO SO JOURNAL OF MATERIALS RESEARCH LA English DT Article ID CU-O SYSTEM; PHASE AB Magnetic shields for SQUID applications were successfully fabricated using high T(c) superconducting Bi-Sr-Ca-Cu-O (BSCCO). In order to produce shields with adequate superconducting properties and close dimensional control, it was necessary to develop several new processing techniques. Shields were produced by casting liquid BSCCO into molds, heat treating, and machining. A series of BSCCO alloys with different compositions were cast from the molten state into metal molds and subsequently heat treated to render the castings superconducting. The heat-treating cycles were studied with the aid of thermogravimetric analysis (TGA), differential thermal analysis (DTA), and dilatometer measurements. The phases and microstructures after various heat-treating cycles were monitored by x-ray diffraction (XRD), optical microscopy, and scanning electron microscopy (SEM). Superconducting properties were measured after various stages of heat treatment and machining. Prototype magnetic shields were machined from bulk castings and found to perform successfully. The most significant factor in shield quality was the nominal composition of the shield, which was shown by transmission electron microscopy (TEM) to affect the grain boundary chemistry. RP RAYNE, RJ (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 12 TC 4 Z9 4 U1 0 U2 1 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 MAR PY 1991 VL 6 IS 3 BP 467 EP 472 DI 10.1557/JMR.1991.0467 PG 6 WC Materials Science, Multidisciplinary SC Materials Science GA FA769 UT WOS:A1991FA76900006 ER PT J AU GADALLAH, AI KHALIL, GM MAIN, AJ MARZOUK, AS AF GADALLAH, AI KHALIL, GM MAIN, AJ MARZOUK, AS TI NUCLEIC-ACID LEVELS IN THE DEVELOPING OVARIES OF HYALOMMA (HYALOMMA) DROMEDARII (ACARI, IXODIDAE) SO JOURNAL OF MEDICAL ENTOMOLOGY LA English DT Article DE ARACHNIDA; HYALOMMA-DROMEDARII; PROTEINS; NUCLEIC ACIDS ID PERSICARGAS ARBOREUS ACARI; ARGASIDAE; HORMONE; RNAS; TICK AB Protein and nucleic acid levels from the ovaries of Hyalomma dromedarii Koch were determined during different stages of oogenesis. The concentrations of total protein, DNA, and RNA increased during oogenesis, reflecting the rapid developmental changes taking place in this tissue. Peak protein and DNA levels were reached in the fully fed females, whereas RNA level peaked slightly earlier. Ribosomal RNA (rRNA) was found to be composed of 27.0s, 17.0s, and 4.1s particles. The ratio of 27.0s to 17.0s varied within the developing ovary, yet the 27.0s/4.1s ratio remained constant. The nucleotides of total RNA and rRNA were determined, and the ratio of purine/pyrimidine equaled almost-equal-to 1 and remained unchanged during oogenesis. C1 USN,MED RES UNIT 3,DIV MED ZOOL,FPO,NEW YORK,NY 09527. NR 39 TC 0 Z9 0 U1 0 U2 0 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 MAR PY 1991 VL 28 IS 2 BP 193 EP 197 PG 5 WC Entomology; Veterinary Sciences SC Entomology; Veterinary Sciences GA FA263 UT WOS:A1991FA26300001 PM 1711581 ER PT J AU SUCHOCKI, JA MAY, EL MARTIN, TJ GEORGE, C MARTIN, BR AF SUCHOCKI, JA MAY, EL MARTIN, TJ GEORGE, C MARTIN, BR TI SYNTHESIS OF 2-EXO-MECAMYLAMINE AND 2-ENDO-MECAMYLAMINE ANALOGS - STRUCTURE-ACTIVITY-RELATIONSHIPS FOR NICOTINIC ANTAGONISM IN THE CENTRAL-NERVOUS-SYSTEM SO JOURNAL OF MEDICINAL CHEMISTRY LA English DT Article ID RECEPTOR AB Nine analogues of mecamylamine (2) which differ in the number and substitution pattern of methyl groups, were prepared. In four of these analogues the amine functionality is in an endo orientation. Enantiomers of 2-endo-and 2-exo-N-methylfenchylamine (25 and 26, respectively) were also prepared. The hydrochloride salts of these compounds were tested for nicotinic antagonism relative to mecamylamine in vivo and none was found to be as potent as mecamylamine, although a broad range of activity was observed. In general, methyl substituents at the C1, C2, and C7 positions of the mecamylamine structure do not appear to be significant for antagonistic activity. Methyl substituents at C3, however, appear to be very important for activity. Three sets of enantiomers of N-methylfenchylamine analogues, 28-30, possessing structural features of mecamylamine and nicotine were also prepared. These compounds were inactive as antagonists. Only a small degree of stereoselectivity was elicited in this series, less than that seen with enantiomers of nicotine. Antagonists with the exo N-methylamine functionality are slightly more active than the endo isomers. The extent to which structural modification might change lipophilicities was estimated through calculated partition coefficients; such changes alone appeared insufficient to explain differences in activities of the analogues. Lastly, a tolerance for a tertiary (dimethyl) amine functionality was demonstrated in addition to the lack of tolerance for bulkier substituents at C3 or on the nitrogen. C1 VIRGINIA COMMONWEALTH UNIV,MED COLL VIRGINIA,DEPT PHARMACOL & TOXICOL,RICHMOND,VA 23298. USN,RES LAB,STRUCT MATTER LAB,WASHINGTON,DC 20375. FU NIDA NIH HHS [DA 00490, DA 07027] NR 22 TC 20 Z9 20 U1 0 U2 4 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0022-2623 J9 J MED CHEM JI J. Med. Chem. PD MAR PY 1991 VL 34 IS 3 BP 1003 EP 1010 DI 10.1021/jm00107a019 PG 8 WC Chemistry, Medicinal SC Pharmacology & Pharmacy GA FB469 UT WOS:A1991FB46900019 PM 2002445 ER PT J AU SULLIVAN, BR AF SULLIVAN, BR TI THE UNITED-STATES AND ITALY, 1922-1940 - SCHMITZ,DF SO JOURNAL OF MODERN HISTORY LA English DT Book Review RP SULLIVAN, BR (reprint author), USN,COLL WAR,NEWPORT,RI 02840, USA. NR 1 TC 0 Z9 0 U1 0 U2 0 PU UNIV CHICAGO PRESS PI CHICAGO PA 5720 S WOODLAWN AVE, CHICAGO, IL 60637 SN 0022-2801 J9 J MOD HIST JI J. Mod. Hist. PD MAR PY 1991 VL 63 IS 1 BP 168 EP 170 DI 10.1086/244291 PG 3 WC History SC History GA FD861 UT WOS:A1991FD86100052 ER PT J AU GABER, BP AF GABER, BP TI HOW BIG IS YOUR DESK-TOP - INTRODUCTION SO JOURNAL OF MOLECULAR GRAPHICS LA English DT Editorial Material RP GABER, BP (reprint author), USN,RES LAB,CTR BIOMOLEC SCI & ENGN,WASHINGTON,DC 20375, USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU BUTTERWORTH-HEINEMANN PI WOBURN PA 225 WILDWOOD AVE #UNITB PO BOX 4500, WOBURN, MA 01801-2084 SN 0263-7855 J9 J MOL GRAPHICS JI J. Mol. Graph. PD MAR PY 1991 VL 9 IS 1 BP 2 EP 2 PG 1 WC Biochemical Research Methods; Biochemistry & Molecular Biology; Computer Science, Interdisciplinary Applications; Crystallography; Mathematical & Computational Biology SC Biochemistry & Molecular Biology; Computer Science; Crystallography; Mathematical & Computational Biology GA FA753 UT WOS:A1991FA75300001 ER PT J AU CHARNOCK, DR JETT, T HEISE, G TAYLOR, R AF CHARNOCK, DR JETT, T HEISE, G TAYLOR, R TI LIPOSARCOMA ARISING IN THE CHEEK - REPORT OF A CASE AND REVIEW OF THE LITERATURE SO JOURNAL OF ORAL AND MAXILLOFACIAL SURGERY LA English DT Review ID HEAD; NECK; TISSUE C1 USN HOSP,DEPT OTOLARYNGOL HEAD & NECK SURG,SAN FRANCISCO,CA 96630. USN HOSP,DEPT DENT,SAN FRANCISCO,CA 96630. USN HOSP,DEPT EAR NOSE & THROAT,SAN FRANCISCO,CA 96630. RP CHARNOCK, DR (reprint author), USN HOSP,DEPT OTOLARYNGOL,SAN FRANCISCO,CA 96630, USA. NR 22 TC 19 Z9 19 U1 0 U2 0 PU W B SAUNDERS CO PI PHILADELPHIA PA INDEPENDENCE SQUARE WEST CURTIS CENTER, STE 300, PHILADELPHIA, PA 19106-3399 SN 0278-2391 J9 J ORAL MAXIL SURG JI J. Oral Maxillofac. Surg. PD MAR PY 1991 VL 49 IS 3 BP 298 EP 300 DI 10.1016/0278-2391(91)90225-B PG 3 WC Dentistry, Oral Surgery & Medicine SC Dentistry, Oral Surgery & Medicine GA EZ535 UT WOS:A1991EZ53500018 PM 1995820 ER PT J AU GUTMARK, E SCHADOW, KC WILSON, KJ AF GUTMARK, E SCHADOW, KC WILSON, KJ TI SUBSONIC AND SUPERSONIC COMBUSTION USING NONCIRCULAR INJECTORS SO JOURNAL OF PROPULSION AND POWER LA English DT Article ID EVOLUTION; JETS AB Nonreacting and combustion tests were performed for subsonic, sonic, and supersonic conditions using noncircular injectors in a gas generator combustor. The noncircular injectors, including square, equilateral-, and isosceles-triangular nozzles, were compared to a circular injector. The flowfields of the jets were mapped with hot-wire anemometry and visualized using spark schlieren photography. The combustion characteristics were visualized by high-speed photography and thermal imaging, and the temperature distribution was measured by a rake of thermocouples. The present tests conducted at high Reynolds and Mach numbers confirmed earlier results obtained for the low range of these numbers, i.e., the combination of large-scale mixing at the flat sides with the fine-scale mixing at the vertices is beneficial for combustion. Large-scale structures provide bulk mixing between the fuel and air, whereas fine-scale mixing contributes to the reaction rate and to better flameholding characteristics. RP GUTMARK, E (reprint author), USN,CTR WEAP,RES DEPT,CHINA LAKE,CA 93555, USA. OI Gutmark, Ephraim/0000-0001-7816-4257 NR 16 TC 24 Z9 24 U1 1 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 MAR-APR PY 1991 VL 7 IS 2 BP 240 EP 249 DI 10.2514/3.23317 PG 10 WC Engineering, Aerospace SC Engineering GA FM898 UT WOS:A1991FM89800015 ER PT J AU PIQUETTE, JC AF PIQUETTE, JC TI A METHOD FOR SYMBOLIC EVALUATION OF INDEFINITE INTEGRALS CONTAINING SPECIAL-FUNCTIONS OR THEIR PRODUCTS SO JOURNAL OF SYMBOLIC COMPUTATION LA English DT Article RP PIQUETTE, JC (reprint author), USN,RES LAB,UNDERWATER SOUND REFERENCE DETACHMENT,POB 568337,ORLANDO,FL 32856, USA. NR 11 TC 3 Z9 3 U1 0 U2 0 PU ACADEMIC PRESS LTD PI LONDON PA 24-28 OVAL RD, LONDON, ENGLAND NW1 7DX SN 0747-7171 J9 J SYMB COMPUT JI J. Symb. Comput. PD MAR PY 1991 VL 11 IS 3 BP 231 EP 249 DI 10.1016/S0747-7171(08)80047-8 PG 19 WC Computer Science, Theory & Methods; Mathematics, Applied SC Computer Science; Mathematics GA FJ214 UT WOS:A1991FJ21400005 ER PT J AU COLLINS, MD AF COLLINS, MD TI HIGHER-ORDER PADE APPROXIMATIONS FOR ACCURATE AND STABLE ELASTIC PARABOLIC EQUATIONS WITH APPLICATION TO INTERFACE WAVE-PROPAGATION SO JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA LA English DT Article ID MEDIA; BOTTOM AB Higher-order Pade approximations are applied to derive accurate and stable parabolic equations for sound propagation in oceans bounded below by an elastic bottom or bounded above by ice cover. Accuracy is achieved by placing constraints on the derivatives of the Pade approximations at the point corresponding to the reference wave number. Stability is achieved by requiring that the Pade approximations map part of the lower-left quadrant of the complex plane into the upper half of the complex plane. Elastic parabolic equations based on these Pade series can handle problems involving compressional, shear, and interface waves, very wide propagation angles, and large depth variations and weak range variations in the seismoacoustic parameters. A finite-difference spectral solution is developed for generating reference solutions and starting fields. The rotated elastic parabolic equation is used to investigate the accuracy of the elastic parabolic equation for range-dependent problems. RP COLLINS, MD (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 25 TC 95 Z9 97 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 MAR PY 1991 VL 89 IS 3 BP 1050 EP 1057 DI 10.1121/1.400646 PG 8 WC Acoustics; Audiology & Speech-Language Pathology SC Acoustics; Audiology & Speech-Language Pathology GA FA701 UT WOS:A1991FA70100009 ER PT J AU COLLINS, MD WESTWOOD, EK AF COLLINS, MD WESTWOOD, EK TI A HIGHER-ORDER ENERGY-CONSERVING PARABOLIC EQUATION FOR RANGE-DEPENDENT OCEAN DEPTH, SOUND SPEED, AND DENSITY SO JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA LA English DT Article ID FINITE-DIFFERENCE TREATMENT; TIME-DOMAIN SOLUTION; WAVE-EQUATION; UNDERWATER ACOUSTICS; INTERFACE CONDITIONS; HETEROGENEOUS MEDIA; PENETRABLE BOTTOM; PULSE-PROPAGATION; APPROXIMATIONS AB Outgoing solutions of the wave equation, including parabolic equation (PE) and normal-mode solutions, are usually formulated so that pressure is continuous with range for range-dependent problems. The accuracy of normal-mode solutions has been improved by conserving energy rather than maintaining continuity of pressure [Porter et al., "The problem of energy conservation in one-way equations," J. Acoust. Soc. Am. 89, 1058-1067 (1991)]. This approach is applied to derive a higher-order energy-conserving PE that provides improved accuracy for problems involving large ocean bottom slopes and large range and depth variations in sound speed and density. A special numerical approach and complex Pade coefficients are applied to suppress Gibbs' oscillations. The back-propagated half-space field, an improved PE starter, is applied to handle wide propagation angles. Reference solutions generated with a complex ray model and with the rotated PE are used for comparison. C1 UNIV TEXAS,APPL RES LABS,AUSTIN,TX 78713. RP COLLINS, MD (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 33 TC 147 Z9 151 U1 2 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 MAR PY 1991 VL 89 IS 3 BP 1068 EP 1075 DI 10.1121/1.400526 PG 8 WC Acoustics; Audiology & Speech-Language Pathology SC Acoustics; Audiology & Speech-Language Pathology GA FA701 UT WOS:A1991FA70100011 ER PT J AU TOLSTOY, A DIACHOK, O FRAZER, LN AF TOLSTOY, A DIACHOK, O FRAZER, LN TI ACOUSTIC TOMOGRAPHY VIA MATCHED FIELD PROCESSING SO JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA LA English DT Article ID NUMERICAL-METHOD; NORMAL-MODES; OCEAN; OPTIMIZATION; PROPAGATION; WATER; EDDY AB This paper suggests a new approach based on narrow-band, low-frequency data using air-deployed shots recorded on widely distributed large aperture vertical arrays. This approach uses fast, cheap, and high S/N data. Results to date with a simulated three-dimensional (3-D) eddy environment show that efficient characterization of the environment plus careful selection of the source/array geometry can lead to highly accurate estimates of the 3-D sound-speed profiles, e.g., maximum errors less than 0.2 m/s. C1 UNIV HAWAII,HAWAII INST GEOPHYS,HONOLULU,HI 96822. RP TOLSTOY, A (reprint author), USN,RES LAB,DIV ACOUST,WASHINGTON,DC 20375, USA. OI Frazer, Laurie/0000-0001-9085-8470 NR 32 TC 82 Z9 93 U1 1 U2 6 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 MAR PY 1991 VL 89 IS 3 BP 1119 EP 1127 DI 10.1121/1.400647 PG 9 WC Acoustics; Audiology & Speech-Language Pathology SC Acoustics; Audiology & Speech-Language Pathology GA FA701 UT WOS:A1991FA70100015 ER PT J AU VANBUREN, AL AF VANBUREN, AL TI NEAR-FIELD TRANSMITTING AND RECEIVING PROPERTIES OF PLANAR NEAR-FIELD CALIBRATION ARRAYS SO JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA LA English DT Article AB The planar near-field calibration array (NFCA) was developed by Trott [W.J. Trott, Underwater Sound Ref. Rep. No. 55 (1961); also J. Acoust. Soc. Am. 36, 1557-1568 (1964)] for use in determining the far-field acoustic radiation from underwater transducers by measurements in the near field. As a projector, the NFCA produces a nearly uniform plane wave over a large volume in its near field and over a large frequency range. As a receiver the NFCA acts like a plane-wave filter for acoustic radiation (or target scattering) originating from within the plane-wave volume. Thus the NFCA can be used to determine the far-field performance of both receiving and projecting transducers. In addition, it can be used to insonify nearby targets with plane waves and determine the resulting scattered far-field pressure. Earlier papers concentrated on the geometrical design of NFCA's and the computation of their relative element responses (or sensitivities) for a specified array configuration, near-field volume, and frequency range. This paper provides analytical expressions for the near-field transmitting voltage and current responses and near-field receiving voltage and current sensitivities of a planar NFCA. The paper also provides information to aid in the NFCA element selection process, especially with regard to shading of the NFCA. RP VANBUREN, AL (reprint author), USN,RES LAB,UNDERWATER SOUND REFERENCE DETACHMENT,POB 568337,ORLANDO,FL 32856, USA. NR 8 TC 5 Z9 5 U1 0 U2 1 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0001-4966 J9 J ACOUST SOC AM JI J. Acoust. Soc. Am. PD MAR PY 1991 VL 89 IS 3 BP 1423 EP 1427 DI 10.1121/1.400542 PG 5 WC Acoustics; Audiology & Speech-Language Pathology SC Acoustics; Audiology & Speech-Language Pathology GA FA701 UT WOS:A1991FA70100043 ER PT J AU MOFFETT, MB CLARK, AE WUNFOGLE, M LINBERG, J TETER, JP MCLAUGHLIN, EA AF MOFFETT, MB CLARK, AE WUNFOGLE, M LINBERG, J TETER, JP MCLAUGHLIN, EA TI CHARACTERIZATION OF TERFENOL-D FOR MAGNETOSTRICTIVE TRANSDUCERS SO JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA LA English DT Article ID RARE-EARTH; ALLOYS AB Measurements were made of the piezomagnetic d33 coefficient, the free permeability, mu-33T, and the open-circuit elastic compliance coefficient, S33H, of grain-oriented Terfenol-D, Tb0.3 Dy0.7 Fe1.93, produced by a modified Bridgman technique. Prestress levels to 9500 psi (65 MPa) and magnetic bias fields up to 2200 Oe (175 kA/m) were applied with a laboratory electromagnet modified so that one pole piece served as a hydraulically actuated piston. The results indicate that d33, mu-33T, and S33H are dependent on stress and magnetic field, so that proper mechanical prestress and magnetic bias conditions are critical to the successful use of Terfenol-D in transducers and actuators. Radiated-power limits for underwater acoustic projectors are estimated and compared with those for projectors having lead zirconate titanate (PZT-4) piezoelectric drivers. Terfenol-D based transducers can be as much as 8 dB superior to PZT-4 under low-Q, field-limited conditions (Q = mechanical quality factor). C1 USN,CTR SURFACE WARFARE,SILVER SPRING,MD 20910. RP MOFFETT, MB (reprint author), USN,CTR UNDERWATER SYST,NEW LONDON,CT 06320, USA. NR 28 TC 182 Z9 189 U1 4 U2 32 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 MAR PY 1991 VL 89 IS 3 BP 1448 EP 1455 DI 10.1121/1.400678 PG 8 WC Acoustics; Audiology & Speech-Language Pathology SC Acoustics; Audiology & Speech-Language Pathology GA FA701 UT WOS:A1991FA70100047 ER PT J AU PIQUETTE, JC AF PIQUETTE, JC TI SOUND SCATTERING OF A SPHERICAL WAVE INCIDENT ON A CYLINDER - COMMENT SO JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA LA English DT Letter ID ELASTIC SOLID CYLINDER RP PIQUETTE, JC (reprint author), USN,RES LAB,UNDERWATER SOUND REFERENCE DETACHMENT,POB 568337,ORLANDO,FL 32856, USA. NR 4 TC 1 Z9 1 U1 0 U2 0 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0001-4966 J9 J ACOUST SOC AM JI J. Acoust. Soc. Am. PD MAR PY 1991 VL 89 IS 3 BP 1462 EP 1462 DI 10.1121/1.400966 PG 1 WC Acoustics; Audiology & Speech-Language Pathology SC Acoustics; Audiology & Speech-Language Pathology GA FA701 UT WOS:A1991FA70100050 ER PT J AU CALLAHAN, JD SORENSEN, SW AF CALLAHAN, JD SORENSEN, SW TI RULE INDUCTION FOR GROUP DECISIONS WITH STATISTICAL-DATA - AN EXAMPLE SO JOURNAL OF THE OPERATIONAL RESEARCH SOCIETY LA English DT Article DE RULE INDUCTION; KNOWLEDGE ACQUISITION; NOISY DATA; EXPERT SYSTEM; GROUP DECISION-MAKING ID EXPERT SYSTEMS AB An expert system was desired for a group decision-making process. A highly variable data set from previous groups' decisions was available to simulate past group decisions. This data set has much missing information and contains many possible errors. Classification and regression trees (CART) was selected for rule induction, and compared with multiple linear regression and discriminant analysis. We conclude that CART's decision rules can be used for rule induction. CART uses all available information and can predict observations with missing data. Errors in results from CART compare well with those from multiple linear regression and discriminant analysis. CART results are easier to understand. C1 USN,CTR PERSONNEL RES & DEV,SAN DIEGO,CA 92152. CALLAHAN ASSOCIATER,LA JOLLA,CA. NR 12 TC 3 Z9 3 U1 0 U2 0 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 MAR PY 1991 VL 42 IS 3 BP 227 EP 234 DI 10.1057/jors.1991.44 PG 8 WC Management; Operations Research & Management Science SC Business & Economics; Operations Research & Management Science GA FH761 UT WOS:A1991FH76100004 ER PT J AU FELDMAN, U EKBERG, JO SEELY, JF BROWN, CM KANIA, DR MACGOWAN, BJ KEANE, CJ BEHRING, WE AF FELDMAN, U EKBERG, JO SEELY, JF BROWN, CM KANIA, DR MACGOWAN, BJ KEANE, CJ BEHRING, WE TI TRANSITIONS OF THE TYPE 2S-2P IN HIGHLY CHARGED FLUORINE-LIKE AND OXYGEN-LIKE MO, CD, IN, AND SN SO JOURNAL OF THE OPTICAL SOCIETY OF AMERICA B-OPTICAL PHYSICS LA English DT Article ID = 2-2 TRANSITIONS; ENERGY-LEVELS; 2S22P5-2S2P6 TRANSITIONS; IONS; SPECTRA; WAVELENGTHS; PLASMAS; TOKAMAK; XXIV; XXV AB Transitions of the type 2s-2p in the F I and O I isoelectronic sequences have been identified in the extreme-ultraviolet spectra from plasmas that were produced by one beam of the Nova laser. In the F I sequence, two transitions were observed for the ions Mo33+, Cd39+, In40+, and Sn41+. In the O I sequence, 13 transitions were observed for Mo34+, 7 transitions for Cd40+, 8 transitions for In41+, and 7 transitions for Sn42+. The observed wavelengths were compared with calculated wavelengths, and predicted wavelengths are presented for the F I sequence up to atomic number Z = 64 and for the O I sequence to Z = 54. C1 UNIV CALIF LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550. NASA,GODDARD SPACE FLIGHT CTR,ASTRON & SOLAR PHYS LAB,SOLAR PHYS BRANCH,GREENBELT,MD 20771. RP FELDMAN, U (reprint author), USN,RES LAB,EO HULBURT CTR SPACE RES,WASHINGTON,DC 20375, USA. NR 19 TC 12 Z9 12 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 MAR PY 1991 VL 8 IS 3 BP 531 EP 537 DI 10.1364/JOSAB.8.000531 PG 7 WC Optics SC Optics GA FA751 UT WOS:A1991FA75100006 ER PT J AU BURKHALTER, PG BROWN, DB GILFRICH, JV KONNERT, JH DANTONIO, P ROSENSTOCK, H SHIREY, LM THOMPSON, M ELINGS, V AF BURKHALTER, PG BROWN, DB GILFRICH, JV KONNERT, JH DANTONIO, P ROSENSTOCK, H SHIREY, LM THOMPSON, M ELINGS, V TI SURFACE CHARACTERIZATION OF MULTILAYER X-RAY-DIFFRACTION SPECIMENS SO JOURNAL OF VACUUM SCIENCE & TECHNOLOGY B LA English DT Article; Proceedings Paper CT 5TH INTERNATIONAL CONF ON SCANNING TUNNELING MICROSCOPY/SPECTROSCOPY ( STM 90 ) / 1ST INTERNATIONAL CONF ON NANOMETER SCALE SCIENCE AND TECHNOLOGY ( NANO 1 ) CY JUL 23-27, 1990 CL BALTIMORE, MD SP AMER VACUUM SOC, USN, OFF NAVAL RES, USAF, OFF SCI RES, NATL SCI FDN, JOHN HOPKINS UNIV, APPL PHYS LAB AB Multilayer specimens of high-Z/low-Z alternating layer stacking have utility as efficient elements for the diffraction and reflection of x rays and ultraviolet radiation. Bielement multilayers of W/C and W/Si, prepared commercially on ultrasmooth substrates, have been characterized by atomic force microscopy (AFM) and by scanning tunneling microscopy to assess the smoothness and nature of the diffraction surface and by transmission electron microscopy to evaluate the uniformity of layering. The diffraction properties of these multilayers have been evaluated by measurements using crystal spectrometers, and by calculations using coherent Bragg diffraction atomic scattering and classical multilayer reflection theory based on stacking uniformity. We have found that the x-ray diffraction performance of W/Si multilayers to be better than W/C multilayers. In addition, the surface of the W/Si specimens were determined by atomic force microscopy to be smoother than W/C and that agreement exists with a roughness factor determined by analytical diffraction theory. The evaluation of multilayers will enhance our understanding of nanostructures, leading to improved diffraction structures. C1 DIGITAL INSTRUMENTS INC,SANTA BARBARA,CA 93117. SACHS FREEMAN ASSOCIATES INC,LANDOVER,MD. RP BURKHALTER, PG (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. RI Shirey, Loretta/B-3164-2013 OI Shirey, Loretta/0000-0003-2600-3405 NR 11 TC 6 Z9 6 U1 0 U2 2 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 1071-1023 J9 J VAC SCI TECHNOL B JI J. Vac. Sci. Technol. B PD MAR-APR PY 1991 VL 9 IS 2 BP 845 EP 852 DI 10.1116/1.585525 PN 2 PG 8 WC Engineering, Electrical & Electronic; Nanoscience & Nanotechnology; Physics, Applied SC Engineering; Science & Technology - Other Topics; Physics GA FL004 UT WOS:A1991FL00400099 ER PT J AU BRANDOW, SL DILELLA, DP COLTON, RJ SHASHIDHAR, R AF BRANDOW, SL DILELLA, DP COLTON, RJ SHASHIDHAR, R TI EVIDENCE OF PRONOUNCED POSITIONAL ORDER AT THE GRAPHITE LIQUID-CRYSTAL INTERFACE OF A BULK NEMATIC MATERIAL SO JOURNAL OF VACUUM SCIENCE & TECHNOLOGY B LA English DT Article; Proceedings Paper CT 5TH INTERNATIONAL CONF ON SCANNING TUNNELING MICROSCOPY/SPECTROSCOPY ( STM 90 ) / 1ST INTERNATIONAL CONF ON NANOMETER SCALE SCIENCE AND TECHNOLOGY ( NANO 1 ) CY JUL 23-27, 1990 CL BALTIMORE, MD SP AMER VACUUM SOC, USN, OFF NAVAL RES, USAF, OFF SCI RES, NATL SCI FDN, JOHN HOPKINS UNIV, APPL PHYS LAB ID SCANNING TUNNELING MICROSCOPY; MOLECULES; SPECTROSCOPY; MECHANISM AB We present scanning tunneling microscopy images of a bulk nematic liquid crystal, viz., 4'-n-hexyl-4-cyanobiphenyl, on the surface of graphite. These images clearly show the existence of pronounced positional order at the solid-liquid crystal interface for a material with no positional order in the bulk. A feature of the molecular arrangement is the pronounced interdigitation of the aromatic cores. The unit cell consists of two opposing molecules, the aromatic core of one of them lying flat on the graphite surface, while the core of the adjacent molecule lies on its side. The packing arrangement also features large open spaces of uncovered substrate between the alkyl tails. The molecular arrangement is compared with that of the smectic alkylcyanobiphenyls. C1 USN,RES LAB,CTR BIOMOLEC SCI & ENGN,WASHINGTON,DC 20375. GEOCENTERS INC,F WASHINGTON,MD 20744. RP BRANDOW, SL (reprint author), USN,RES LAB,DIV CHEM,CODE 6177,WASHINGTON,DC 20375, USA. NR 15 TC 17 Z9 17 U1 1 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 MAR-APR PY 1991 VL 9 IS 2 BP 1115 EP 1118 DI 10.1116/1.585228 PN 2 PG 4 WC Engineering, Electrical & Electronic; Nanoscience & Nanotechnology; Physics, Applied SC Engineering; Science & Technology - Other Topics; Physics GA FL004 UT WOS:A1991FL00400155 ER PT J AU MARRIAN, CRK DOBISZ, EA COLTON, RJ AF MARRIAN, CRK DOBISZ, EA COLTON, RJ TI INVESTIGATIONS OF UNDEVELOPED E-BEAM RESIST WITH A SCANNING TUNNELING MICROSCOPE SO JOURNAL OF VACUUM SCIENCE & TECHNOLOGY B LA English DT Article; Proceedings Paper CT 5TH INTERNATIONAL CONF ON SCANNING TUNNELING MICROSCOPY/SPECTROSCOPY ( STM 90 ) / 1ST INTERNATIONAL CONF ON NANOMETER SCALE SCIENCE AND TECHNOLOGY ( NANO 1 ) CY JUL 23-27, 1990 CL BALTIMORE, MD SP AMER VACUUM SOC, USN, OFF NAVAL RES, USAF, OFF SCI RES, NATL SCI FDN, JOHN HOPKINS UNIV, APPL PHYS LAB ID ELECTRON AB A scanning tunneling microscope (STM), operated in vacuum in the field emission mode, has been used to observe the latent image written with a focussed 50 kV e-beam in a polydiacetylene negative resist. The ability to study the latent image in the undeveloped resist allows the resolution degradation caused by the exposure process to be separated from that occurring during the resist development step. The minimum linewidth observed in the resist is close to 80 nm in both the developed and undeveloped resist. This linewidth is significantly greater than that expected on the basis of the 50 kV e-beam probe size, electron scattering, and secondary electrons. The results indicate that the resolution degradation occurs during the exposure process rather than during post-exposure processing. This implies that swelling during development is not the critical problem it is with other negative resists. The quality and accuracy of the STM observations is discussed together with descriptions of related surface modifications created in situ with the STM. C1 USN,RES LAB,DIV CHEM,WASHINGTON,DC 20375. RP MARRIAN, CRK (reprint author), USN,RES LAB,DIV ELECT SCI & TECHNOL,CODE 6864,WASHINGTON,DC 20375, USA. NR 18 TC 13 Z9 13 U1 0 U2 0 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 1071-1023 J9 J VAC SCI TECHNOL B JI J. Vac. Sci. Technol. B PD MAR-APR PY 1991 VL 9 IS 2 BP 1367 EP 1370 DI 10.1116/1.585198 PN 2 PG 4 WC Engineering, Electrical & Electronic; Nanoscience & Nanotechnology; Physics, Applied SC Engineering; Science & Technology - Other Topics; Physics GA FL004 UT WOS:A1991FL00400210 ER PT J AU GLEMBOCKI, OJ DOBISZ, EA AF GLEMBOCKI, OJ DOBISZ, EA TI RAMAN-SCATTERING STUDY OF DRY ETCHING OF GAAS - A COMPARISON OF CHEMICALLY ASSISTED ION-BEAM ETCHING AND REACTIVE ION ETCHING SO JOURNAL OF VACUUM SCIENCE & TECHNOLOGY B LA English DT Article; Proceedings Paper CT 5TH INTERNATIONAL CONF ON SCANNING TUNNELING MICROSCOPY/SPECTROSCOPY ( STM 90 ) / 1ST INTERNATIONAL CONF ON NANOMETER SCALE SCIENCE AND TECHNOLOGY ( NANO 1 ) CY JUL 23-27, 1990 CL BALTIMORE, MD SP AMER VACUUM SOC, USN, OFF NAVAL RES, USAF, OFF SCI RES, NATL SCI FDN, JOHN HOPKINS UNIV, APPL PHYS LAB ID INP; DAMAGE AB Chemically assisted ion beam etching (CAIBE) and reactive ion etching (RIE) are two popular dry etching techniques routinely used in the fabrication of submicron features. We have used both in situ and ex situ Raman spectroscopy to study the effects of dry etching on the depletion layer in heavily doped GaAs. We find that both CAIBE and RIE produce large numbers of traps that produce an insulating layer on the surface. CAIBE using ion energies greater than 2 keV also produces a damaged layer. For both techniques the use of chlorine based species reduces both traps and damage. Sputtering with chlorine alone, is shown to be able to eliminate both damage and traps. Finally, Raman spectroscopy is shown as a powerful in situ tool for studying etch damage. RP GLEMBOCKI, OJ (reprint author), USN,RES LAB,CODE 6864,WASHINGTON,DC 20375, USA. NR 15 TC 12 Z9 12 U1 0 U2 1 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 1071-1023 J9 J VAC SCI TECHNOL B JI J. Vac. Sci. Technol. B PD MAR-APR PY 1991 VL 9 IS 2 BP 1403 EP 1407 DI 10.1116/1.585594 PN 2 PG 5 WC Engineering, Electrical & Electronic; Nanoscience & Nanotechnology; Physics, Applied SC Engineering; Science & Technology - Other Topics; Physics GA FL004 UT WOS:A1991FL00400218 ER PT J AU MARSHALL, L AF MARSHALL, L TI DECISION CRITERIA FOR PURE-TONE DETECTION USED BY 2 AGE-GROUPS OF NORMAL-HEARING AND HEARING-IMPAIRED LISTENERS SO JOURNALS OF GERONTOLOGY LA English DT Article ID WEIGHT DISCRIMINATION TASK; PERCEPTION; YOUNG; BIAS; PAIN AB Response criteria from a yes-no task and detection thresholds from two test procedures were measured for four groups of adults: younger normal-hearing, older normal-hearing, younger hearing-impaired, and older hearing-impaired. The two test procedures were an audiological procedure (which does not control for response bias) and a 2IFC adaptive procedure (which does control for bias). The signal was a 500 or 4000 Hz tone presented in quiet. All four groups showed an equally conservative response bias in the yes-no task. In addition, neither age nor hearing loss affected the difference (6.5 dB) between the two threshold measures. C1 BOYS TOWN NATL INST COMMUN DISORDERS CHILDREN,OMAHA,NE. RP MARSHALL, L (reprint author), USN,SUBMARINE MED RES LAB,BOX 900,NAVAL SUBMARINE BASE NEW LONDON,GROTON,CT 06439, USA. NR 18 TC 4 Z9 4 U1 0 U2 3 PU GERONTOLOGICAL SOCIETY AMER PI WASHINGTON PA 1275 K STREET NW SUITE 350, WASHINGTON, DC 20005-4006 SN 0022-1422 J9 J GERONTOL JI J. Gerontol. PD MAR PY 1991 VL 46 IS 2 BP P67 EP P70 PG 4 WC Geriatrics & Gerontology; Gerontology SC Geriatrics & Gerontology GA GQ139 UT WOS:A1991GQ13900016 PM 1997578 ER PT J AU BROOK, I FRAZIER, EH THOMPSON, DH AF BROOK, I FRAZIER, EH THOMPSON, DH TI AEROBIC AND ANAEROBIC MICROBIOLOGY OF PERITONSILLAR ABSCESS SO LARYNGOSCOPE LA English DT Article ID CHILDREN; BACTERIOLOGY AB Thirty-four aspirates of pus from peritonsillar abscesses that were studied for aerobic and anaerobic bacteria showed bacterial growth. A total 107 bacterial isolates (58 anaerobic and 49 aerobic and facultative) were recovered, accounting for 3.1 isolates per specimen (1.7 anaerobic and 1.4 aerobic and facultatives). Anaerobic bacteria only were present in 6 (18%) patients, aerobic and facultatives in 2 (6%), and mixed aerobic and anaerobic flora in 26 (76%). Single bacterial isolates were recovered in 4 infections, 2 of which were Streptococcus pyogenes and 2 were anaerobic bacteria. The predominant bacterial isolates were Staphylococcus aureus (6 isolates), Bacteroides sp (21 isolates, including 15 Bacteriodes melaninogenicus group), and Peptostreptococcus sp (16) and S. pyogenes (10). Beta-Lactamase-producing organisms were recovered from 13 (52%) of 25 specimens tested. This retrospective study highlights the polymicrobial nature and importance of anaerobic bacteria in peritonsillar abscess. C1 USN,MED CTR,BETHESDA,MD 20814. NR 28 TC 58 Z9 59 U1 1 U2 3 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 MAR PY 1991 VL 101 IS 3 BP 289 EP 292 PG 4 WC Medicine, Research & Experimental; Otorhinolaryngology SC Research & Experimental Medicine; Otorhinolaryngology GA FC521 UT WOS:A1991FC52100012 PM 2000017 ER PT J AU TALUKDER, MAH AF TALUKDER, MAH TI RING-OPENING POLYMERIZATION OF OXETANES BY CATIONIC INITIATORS - POLYMERIZATION OF 3-AZIDOMETHYL-3-METHYLOXETANE WITH BIS(CHLORODIMETHYLSILYL)BENZENE SILVER HEXAFLUOROANTIMONATE INITIATING SYSTEM SO MAKROMOLEKULARE CHEMIE-MACROMOLECULAR SYMPOSIA LA English DT Article AB Quasi-living cationic polymerization of 3-azidomethyl-3-methyl-oxetane (AMMO) was achieved with a bis(chlorodimethylsilyl)benzene/silver hexafluoroantimonate (BSB/AgSbF6) initiating system in methylene chloride at -78-degrees-C. The average molecular weight (M(n)) increased linearly with an increasing monomer/initiator ([M]/[I]) ratio and a linear M(n) vs. [M]/[I] ratio plot passes through the origin. M(n)'s observed were higher than the calculated value. This indicates the initial loss of initiator or slow initiation during the polymerization of AMMO with BSB/AgSbF6 initiating system, or the combination of both. Theoretically, in a system where the initiation is slower than the propagation, a diblock copolymer will be formed. Similarly, impurities, such as water, will cause chain transfer to the propagating chains during polymerization and form a homopolymer and a diblock copolymer in addition to the desired triblock copolymer. In short, a perfect triblock copolymer will be formed for a difunctional cationic initiator when the system is pure and dry and the initiation of polymerization is faster than the propagation. C1 USN,CTR WEAP,DEPT RES,DIV CHEM,CHINA LAKE,CA 93555. NR 13 TC 5 Z9 5 U1 1 U2 3 PU HUTHIG & WEPF VERLAG PI BASEL PA AUF DEM WOLF 4 FX#001-41-61-317-94-11, CH-4052 BASEL, SWITZERLAND SN 0258-0322 J9 MAKROMOL CHEM-M SYMP PD MAR PY 1991 VL 42-3 BP 501 EP 511 DI 10.1002/masy.19910420141 PG 11 WC Polymer Science SC Polymer Science GA FM825 UT WOS:A1991FM82500040 ER PT J AU WEISS, H KOIDE, M BERTINE, KK GOLDBERG, ED AF WEISS, H KOIDE, M BERTINE, KK GOLDBERG, ED TI SCAVENGING OF PARTICULATE MATTER IN COASTAL WATERS SO MARINE CHEMISTRY LA English DT Article; Proceedings Paper CT 1ST INTERNATIONAL SYMP ON SMALL ESTUARIES : PHYSICAL, CHEMICAL AND BIOLOGICAL PROCESSES IN STRATIFIED ESTUARIES CY MAY 21-27, 1989 CL PRIMOSTEN, YUGOSLAVIA SP COUNCIL SCI RES CROATIA, KIKA NATL PARK, COMMISS EUROPEAN COMMUNITIES, CNRS, US DOE, NATL SCI FDN, UN ENVIRONM PROGRAMME, MEDITERRANEAN ACT PLAN, UNESCO AB The uptake of a suite of 19 metals from coastal seawaters upon both glass and Teflon surfaces reflected primarily the sorption of particulate matter derived from crustal rock weathering. Uptake for all elements was greater in the light than in the dark. Based upon these and earlier results, a new definition of scavenging for environmental systems is proposed. C1 UNIV CALIF SAN DIEGO,SCRIPPS INST OCEANOG,LA JOLLA,CA 92093. USN,CTR OCEANS SYST,SAN DIEGO,CA 92110. SAN DIEGO STATE UNIV,SAN DIEGO,CA 92182. NR 3 TC 2 Z9 2 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0304-4203 J9 MAR CHEM JI Mar. Chem. PD MAR PY 1991 VL 32 IS 2-4 BP 171 EP 175 DI 10.1016/0304-4203(91)90036-V PG 5 WC Chemistry, Multidisciplinary; Oceanography SC Chemistry; Oceanography GA FF356 UT WOS:A1991FF35600007 ER PT J AU CABLE, CW AF CABLE, CW TI THE EFFECT OF DEFECTS IN GLASS-REINFORCED PLASTIC (GRP) SO MARINE TECHNOLOGY AND SNAME NEWS LA English DT Article AB A rational basis for developing acceptance standards for glass-reinforced plastic structures hulls in presented. Using existing models and a fracture mechanics analysis, the effects of key defects are quantified. Cracks in the edges of penetrations are shown to be potentially critical defects. Additionally, an equivalency between key defects is demonstrated. This equivalency allows correct proportioning of efforts to control and correct defects. RP CABLE, CW (reprint author), USN,NAVAL SEA SYST COMMAND,WASHINGTON,DC 20350, USA. NR 0 TC 5 Z9 5 U1 0 U2 0 PU SOC NAVAL ARCH MARINE ENG PI JERSEY CITY PA 601 PAVONIA AVENUE, JERSEY CITY, NJ 07306 SN 0025-3316 J9 MAR TECHNOL SNAME N JI Mar. Technol. Sname News PD MAR PY 1991 VL 28 IS 2 BP 91 EP 98 PG 8 WC Engineering, Ocean; Oceanography SC Engineering; Oceanography GA FD017 UT WOS:A1991FD01700004 ER PT J AU INGOLD, BP DUNLAP, ML AF INGOLD, BP DUNLAP, ML TI WHEN JOHNNY (JOANNY) COMES MARCHING HOME - JOB SECURITY FOR THE RETURNING SERVICE MEMBER UNDER THE VETERANS REEMPLOYMENT RIGHTS ACT SO MILITARY LAW REVIEW LA English DT Article C1 USN,AIR STN,FALLEN,NV. RP INGOLD, BP (reprint author), USA,JUDGE ADVOCATE GEN SCH,DIV ADM & CIVIL LAW,CHARLOTTESVILLE,VA 22901, USA. NR 9 TC 0 Z9 0 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 SPR PY 1991 VL 132 BP 175 EP 202 PG 28 WC Law SC Government & Law GA FR094 UT WOS:A1991FR09400008 ER PT J AU GROSSKREUTZ, SR OSBORN, RE SANCHEZ, RM AF GROSSKREUTZ, SR OSBORN, RE SANCHEZ, RM TI COMPUTED-TOMOGRAPHY OF THE BRAIN IN THE EVALUATION OF THE HEADACHE PATIENT SO MILITARY MEDICINE LA English DT Article AB A retrospective analysis was conducted of 100 consecutive patients evaluated with computerized tomography of the head who had the chief complaint of headache. Three percent of these patients had abnormal findings, which were clinically significant in terms of patient treatment and follow-up. An additional 10% had computed tomography findings, which were clinically insignificant in that they did not alter the patient's treatment or clinical course. All of the significant findings occurred in patients who were age 45 years or older. In the 85 patients who were less than age 45, no significant abnormalities were found. RP GROSSKREUTZ, SR (reprint author), USN HOSP,DEPT CLIN INVEST,SAN DIEGO,CA 92134, USA. NR 0 TC 14 Z9 14 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 MAR PY 1991 VL 156 IS 3 BP 137 EP 140 PG 4 WC Medicine, General & Internal SC General & Internal Medicine GA FB001 UT WOS:A1991FB00100011 PM 1901976 ER PT J AU FRANKE, R AF FRANKE, R TI SENSITIVITY OF THE ERROR IN MULTIVARIATE STATISTICAL INTERPOLATION TO PARAMETER VALUES SO MONTHLY WEATHER REVIEW LA English DT Article ID OBJECTIVE ANALYSIS AB The sensitivity of multivariate optimum interpolation to variations in values of its parameters is investigated, including missing observation values. The influence of observation error misspecification and parameters in the spatial correlation function are also considered. The calculations are carried out on three different observation patterns: fairly uniform, partly uniform-partly sparse, and sparse. The decay rate of the correlation function is an important parameter to estimate properly, and estimates of height and wind errors should be consistent. RP FRANKE, R (reprint author), USN,POSTGRAD SCH,DEPT MATH CODE MA-FE,MONTEREY,CA 93943, USA. NR 19 TC 2 Z9 2 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 MAR PY 1991 VL 119 IS 3 BP 815 EP 832 DI 10.1175/1520-0493(1991)119<0815:SOTEIM>2.0.CO;2 PG 18 WC Meteorology & Atmospheric Sciences SC Meteorology & Atmospheric Sciences GA FF876 UT WOS:A1991FF87600014 ER PT J AU POOLE, PK AF POOLE, PK TI AN ANALYTICAL MODEL OF THE FLOATING DRY DOCK ARDM-3 SO NAVAL ENGINEERS JOURNAL LA English DT Article AB The characteristics of a floating dry dock and the ship to be docked can be programmed into an analytical model developed on a personal computer generating accurate predictions of all parameters of interest to the docking officer. The dry dock model allows for the rapid generation of the ballast tank levels required to raise the ship and dock while providing the expected dock draft, basin height, stability parameters, and longitudinal deflection predictions at all critical times during the docking evolution for any realistic ship load and desired position. Such a model is developed herein for the floating dry dock ARDM-3, located at the Charleston Naval Shipyard, S.C. RP POOLE, PK (reprint author), USN ACAD,NAVAL SYST ENGN,ANNAPOLIS,MD 21402, USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER SOC NAVAL ENG INC PI ALEXANDRIA PA 1452 DUKE STREET, ALEXANDRIA, VA 22314-3458 SN 0028-1425 J9 NAV ENG J JI Nav. Eng. J. PD MAR PY 1991 VL 103 IS 2 BP 50 EP 58 PG 9 WC Engineering, Marine; Engineering, Civil; Oceanography SC Engineering; Oceanography GA FB247 UT WOS:A1991FB24700003 ER PT J AU BURDICK, L AF BURDICK, L TI READINESS BASED SPARING (RBS) - FROM CONCEPT EXPLORATION TO FULL SCALE DEVELOPMENT SO NAVAL ENGINEERS JOURNAL LA English DT Article AB The actual implementation of a major acquisition program undertaken by the Navy is the result of successfully completing each of four critical acquisition phases: concept exploration, demonstration & validation, full scale development, and production/deployment. "Readiness Based Sparing (RBS) - The Process" must also successfully pass through these critical phases prior to implementation and institutionalization. Having successfully completed the Concept Exploration and Demonstration & Validation phases (which spanned Fiscal years 1979-1987), Navy has directed Full Scale Development of RBS - The Process for the DDG-51 Class of ships beginning with the DDG-52 as the prototype. The Full Scale Development effort, which began in July 1988, involves prototyping the sparing of the entire DDG-52 platform to readiness objectives within a funding constraint and the evolution of a total process which ensures that resources can be linked to readiness at the platform level for all new construction ships. A joint NavSea/NavSup Working Group and a Flag Steering Board have been established to implement and monitor the application of RBS - The Process on DDG-52. To date, significant progress has been made in the areas of data collection/correlation, RBD development, identification of design support constraints and readiness drivers, assignment of preliminary A(o) thresholds, improving data quality and increased communication between the engineering and logistics communities. The progress which has been made to date provides a formidable foundation, which we must continue to strengthen, as we move toward the Production/Deployment phase of RBS - The Presses. RP BURDICK, L (reprint author), USN,SUPPLY SYST COMMAND HEADQUARTERS,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 MAR PY 1991 VL 103 IS 2 BP 71 EP 82 PG 12 WC Engineering, Marine; Engineering, Civil; Oceanography SC Engineering; Oceanography GA FB247 UT WOS:A1991FB24700005 ER PT J AU STOCK, RJ AF STOCK, RJ TI TUBAL PREGNANCY - ASSOCIATED HISTOPATHOLOGY SO OBSTETRICS AND GYNECOLOGY CLINICS OF NORTH AMERICA LA English DT Article ID ISTHMIC ECTOPIC PREGNANCY; FALLOPIAN-TUBE; LAPAROSCOPIC TREATMENT; GESTATION; OCCLUSION C1 EASTERN VIRGINIA MED SCH,DEPT PATHOL,NORFOLK,VA 23501. RP STOCK, RJ (reprint author), USN,PORTSMOUTH NAVAL HOSP,PORTSMOUTH,VA 23708, USA. NR 41 TC 16 Z9 16 U1 0 U2 0 PU W B SAUNDERS CO PI PHILADELPHIA PA INDEPENDENCE SQUARE WEST CURTIS CENTER, STE 300, PHILADELPHIA, PA 19106-3399 SN 0889-8545 J9 OBSTET GYN CLIN N AM JI Obstet. Gynecol. Clin. N. Am. PD MAR PY 1991 VL 18 IS 1 BP 73 EP 94 PG 22 WC Obstetrics & Gynecology SC Obstetrics & Gynecology GA EZ498 UT WOS:A1991EZ49800006 PM 1923257 ER PT J AU DOSAKAAKITA, H ROSENBERG, RK MINNA, JD BIRRER, MJ AF DOSAKAAKITA, H ROSENBERG, RK MINNA, JD BIRRER, MJ TI A COMPLEX PATTERN OF TRANSLATIONAL INITIATION AND PHOSPHORYLATION IN L-MYC PROTEINS SO ONCOGENE LA English DT Article ID CELL LUNG-CANCER; FIBROBLAST GROWTH-FACTOR; CASEIN KINASE-II; NON-AUG CODONS; C-MYC; MESSENGER-RNAS; EMBRYO FIBROBLASTS; GENE FAMILY; LINES; TRANSFORMATION AB Molecular analysis of the human proto-oncogene L-myc revealed a complex pattern of gene expression including alternative splicing and polyadenylation site selection of mRNA, giving rise to at least four mRNAs. These mRNAs in turn can code for several proteins. In this report, we characterize and define the origins of the major L-myc proteins. In vitro translation revealed that (i) two L-myc proteins (p59 and p65) were derived through alternative translational initiation at a non-AUG (CUG) site in intron 1 and at an AUC site in exon 2 of L-myc, and that (ii) extensive post-translational phosphorylation of these proteins yielded three additional proteins (p60, p66, and p68). Transfection experiments in rat embryo cells revealed the in vivo existence of this unusual CUG-initiated protein and demonstrated that it possessed transforming activity. Further, immuno-precipitation using high titered anti-L-myc peptide antisera, of two L-myc expressing small-cell lung cancer cell lines revealed three major L-myc proteins (p60, p66 and p68) all of which were derived from extensive phosphorylation of a p59 protein. C1 NCI,USN,MED ONCOL BRANCH,BETHESDA,MD 20892. UNIFORMED SERV UNIV HLTH SCI,BETHESDA,MD 20814. NR 40 TC 27 Z9 27 U1 0 U2 0 PU STOCKTON PRESS PI BASINGSTOKE PA HOUNDMILLS, BASINGSTOKE, HAMPSHIRE, ENGLAND RG21 6XS SN 0950-9232 J9 ONCOGENE JI Oncogene PD MAR PY 1991 VL 6 IS 3 BP 371 EP 378 PG 8 WC Biochemistry & Molecular Biology; Oncology; Cell Biology; Genetics & Heredity SC Biochemistry & Molecular Biology; Oncology; Cell Biology; Genetics & Heredity GA FT344 UT WOS:A1991FT34400004 PM 1849244 ER PT J AU CERTOSIMO, AJ HOUSE, RC ANDERSON, MH AF CERTOSIMO, AJ HOUSE, RC ANDERSON, MH TI THE EFFECT OF CROSS-SECTIONAL AREA ON TRANSVERSE STRENGTH OF AMALGAPIN-RETAINED RESTORATIONS SO OPERATIVE DENTISTRY LA English DT Article AB The transverse strength of large amalgam restorations retained by amalgapins of varying diameter and number was evaluated. Restorations with amalgapin retention fractured with greatest frequency parallel to the pulpal floor through the amalgapin at the amalgam-tooth interface. The findings indicate that the geometric configuration and number of amalgapins was of greater importance to the transverse strength of amalgapin-retained restorations than the total cross-sectional area. RP CERTOSIMO, AJ (reprint author), USN,SCH DENT,NATL NAVAL DENT CTR,BETHESDA,MD 20814, USA. NR 0 TC 3 Z9 3 U1 0 U2 0 PU UNIV WASHINGTON PI SEATTLE PA SCHOOL DENTISTRY SM-57, SEATTLE, WA 98195 SN 0361-7734 J9 OPER DENT JI Oper. Dent. PD MAR-APR PY 1991 VL 16 IS 2 BP 70 EP 76 PG 7 WC Dentistry, Oral Surgery & Medicine SC Dentistry, Oral Surgery & Medicine GA FJ079 UT WOS:A1991FJ07900005 PM 1803331 ER PT J AU SCHEPS, R AF SCHEPS, R TI EXTRACTION EFFICIENCY UNIFORMITY IN RARE-GAS HALIDE LASERS SO OPTICAL ENGINEERING LA English DT Article DE LASERS; EXCIMERS; UNIFORMITY; EXTRACTION EFFICIENCY ID ABSORPTION AB The dependence of the extraction efficiency on the temporal variations in the quenching rate, absorption, and upper level formation rate is analyzed for rare gas halide lasers. The influence of these effects on laser output irradiance uniformity is significant, and it is shown that the optimum laser design is obtained by a compromise between maximum extraction efficiency and output uniformity. The results are presented in a parametric manner for general applicability. RP SCHEPS, R (reprint author), USN,CTR OCEAN SYST,CODE 843,SAN DIEGO,CA 92152, USA. NR 18 TC 0 Z9 0 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 MAR PY 1991 VL 30 IS 3 BP 317 EP 322 DI 10.1117/12.55800 PG 6 WC Optics SC Optics GA FA811 UT WOS:A1991FA81100012 ER PT J AU TSYPKIN, M AF TSYPKIN, M TI THE SOVIET MILITARY - COUNTERING THE WEST IN NEW WAYS SO ORBIS-A JOURNAL OF WORLD AFFAIRS LA English DT Article RP TSYPKIN, M (reprint author), USN,POSTGRAD SCH,MONTEREY,CA 93940, USA. NR 24 TC 0 Z9 0 U1 0 U2 0 PU JAI PRESS INC PI GREENWICH PA 55 OLD POST RD-#2, PO BOX 1678, GREENWICH, CT 06836-1678 SN 0030-4387 J9 ORBIS-J WORLD AFF JI Orbis-J. World Aff. PD SPR PY 1991 VL 35 IS 2 BP 207 EP 218 PG 12 WC International Relations SC International Relations GA FJ633 UT WOS:A1991FJ63300004 ER PT J AU GIRGIS, NI FARID, Z KILPATRICK, ME SULTAN, Y MIKHAIL, IA AF GIRGIS, NI FARID, Z KILPATRICK, ME SULTAN, Y MIKHAIL, IA TI DEXAMETHASONE ADJUNCTIVE TREATMENT FOR TUBERCULOUS MENINGITIS SO PEDIATRIC INFECTIOUS DISEASE JOURNAL LA English DT Article DE TUBERCULOUS MENINGITIS; DEXAMETHASONE; ADJUNCTIVE THERAPY ID RIFAMPICIN; CHILDREN; THERAPY AB During a 5-year period, 280 of 2010 patients admitted to the meningitis ward of a referral hospital in Cairo, Egypt, were clinically diagnosed as having tuberculous meningitis and were treated with either antituberculous chemotherapy and dexamethasone or antituberculous chemotherapy alone. Fatality rates and neurologic sequelae were compared for the 2 treatment groups in the 160 patients who had cerebrospinal fluid cultures positive for Mycobacterium tuberculosis. The overall mortality rate of 51% reflects the delay in receiving appropriate therapy (79% with symptoms for more than 2 weeks) and the severity of illness on admission (56% in coma, 39% drowsy). The fatality rate was significantly lower in the group receiving dexamethasone (43% vs. 59%, P < 0.05), particularly in the drowsy patients (15% vs. 40% P < 0.04), and in patients surviving long enough to receive at least 10 days of treatment (14% vs. 33%, P < 0.02). Development of neurologic complications after initiation of therapy (4 vs. 10) and permanent sequelae (6 vs. 13) were significantly lower in the dexamethasone-treated group (P < 0.02). C1 MINIST HLTH CAIRO,ABBASSIA FEVER HOSP,CAIRO,EGYPT. RP GIRGIS, NI (reprint author), USN,MED RES UNIT 3,NEW YORK,NY 09527, USA. NR 26 TC 132 Z9 138 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 MAR PY 1991 VL 10 IS 3 BP 179 EP 183 DI 10.1097/00006454-199103000-00002 PG 5 WC Immunology; Infectious Diseases; Pediatrics SC Immunology; Infectious Diseases; Pediatrics GA FC019 UT WOS:A1991FC01900002 PM 2041662 ER PT J AU DUESBERY, MS SADANANDA, K AF DUESBERY, MS SADANANDA, K TI THE INTERACTION OF DISLOCATIONS WITH COHERENT INCLUSIONS .1. PERFECT EDGE AND SCREW DISLOCATIONS SO PHILOSOPHICAL MAGAZINE A-PHYSICS OF CONDENSED MATTER STRUCTURE DEFECTS AND MECHANICAL PROPERTIES LA English DT Article ID ANISOTROPIC CRYSTALS AB The passage of edge and screw dislocations through an array of spherical coherent obstacles is simulated for several obstacle sizes, array dimensions and misfit values, using computer techniques adapted from molecular dynamic methods. For small misfits, intersection of the obstacle takes place and the passing stress increases rapidly with increasing misfit. Above a critical misfit value, which varies with the size and separation of the obstacles, the passing mechanism changes to Orowan loop formation; the passing stress continues to increase with increasing misfit, but at a lower rate. It is found that there are two principal consequences of the obstacle stress field. Dipole-enhancing effects can lead to a reduction in the breaking angle to as low as 40-degrees from the near-90-degrees value expected for impenetrable obstacles, with a corresponding decrease in the passing stress. However, the coherency stresses also renormalize the obstacle geometry to increase their effectiveness as barriers to dislocation motion, causing an increase in the passing stress. C1 GEOCENTERS INC,FT WASHINGTON,MD 20744. RP DUESBERY, MS (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 34 TC 11 Z9 11 U1 1 U2 4 PU TAYLOR & FRANCIS LTD PI LONDON PA ONE GUNDPOWDER SQUARE, LONDON, ENGLAND EC4A 3DE SN 0141-8610 J9 PHILOS MAG A JI Philos. Mag. A-Phys. Condens. Matter Struct. Defect Mech. Prop. PD MAR PY 1991 VL 63 IS 3 BP 535 EP 558 PG 24 WC Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering; Physics, Applied; Physics, Condensed Matter SC Materials Science; Metallurgy & Metallurgical Engineering; Physics GA FF206 UT WOS:A1991FF20600013 ER PT J AU LOUAT, NP DUESBERY, MS IMAM, MA PROVENZANO, V SADANANDA, K AF LOUAT, NP DUESBERY, MS IMAM, MA PROVENZANO, V SADANANDA, K TI ON DISPERSIONS OF VOIDS AS SOURCES OF STRENGTH SO PHILOSOPHICAL MAGAZINE LETTERS LA English DT Article AB Materials of reduced density and increased strength can be achieved by the creation of dispersed voids. A procedure for the manufacture of such materials is described and their characteristic strength estimated. C1 USN,RES LAB,WASHINGTON,DC 20375. RP LOUAT, NP (reprint author), GEOCENTERS INC,FT WASHINGTON,MD 20744, USA. NR 5 TC 6 Z9 6 U1 0 U2 3 PU TAYLOR & FRANCIS LTD PI LONDON PA ONE GUNDPOWDER SQUARE, LONDON, ENGLAND EC4A 3DE SN 0950-0839 J9 PHIL MAG LETT JI Philos. Mag. Lett. PD MAR PY 1991 VL 63 IS 3 BP 159 EP 163 DI 10.1080/09500839108205985 PG 5 WC Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering; Physics, Applied; Physics, Condensed Matter SC Materials Science; Metallurgy & Metallurgical Engineering; Physics GA FF119 UT WOS:A1991FF11900008 ER PT J AU RAJAGOPAL, AK JHA, SS AF RAJAGOPAL, AK JHA, SS TI GENERALIZED PAIRING THEORY OF SUPERCONDUCTIVITY IN LAYERED CRYSTALS SO PHYSICA C LA English DT Article ID HIGH-TEMPERATURE SUPERCONDUCTORS; HIGH-TC SUPERCONDUCTIVITY; MECHANISM; OXIDES; STATE AB A generalized pairing theory of superconductivity in layered crystals is formulated in terms of an arbitrary dynamical interaction, V(r1r2; t1-t2), among the electrons. This has been done within the framework of the Gorkov mean field theory, with the introduction of an appropriate set of states to represent the single particle motion in the layered crystals. The layer representation is band-like in the plane of the layers and localized in the perpendicular direction. This enables us to derive the equation for the superconducting state which includes intra- and inter-layer polarization interactions involving exchange of all possible electronic and ionic excitations in the system within the strong coupling formalism. An equation for the critical temperature T(c) of the system has been obtained by solving the linearized gap equation in terms of a suitably averaged dynamical interaction. We specify from first principles the various approximations required to obtain the simpler forms of the T(c)-equation used in the literature for investigating its dependence on the structure and number of conducting layers in the new high-T(c) systems. In general, we find that the dynamical interactions can involve a maximum of any four different layers with intra- and inter-layer pairings. In the extreme layer approximation, where the excitations are highly localized to within individual layers, the interaction connects only a maximum of any two layers. These considerations still imply that the required attractive interaction for intra-layer Cooper pairing in a conducting layer may arise from both intra- and inter-layer couplings and possible exchange of excitations in the neighboring layers whether conducting or insulating. C1 TATA INST FUNDAMENTAL RES,BOMBAY 400005,INDIA. RP RAJAGOPAL, AK (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 33 TC 11 Z9 11 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0921-4534 J9 PHYSICA C JI Physica C PD MAR 1 PY 1991 VL 174 IS 1-3 BP 161 EP 179 DI 10.1016/0921-4534(91)90433-Y PG 19 WC Physics, Applied SC Physics GA FB825 UT WOS:A1991FB82500021 ER PT J AU PIESTRUP, MA MORAN, MJ BOYERS, DG PINCUS, CI KEPHART, JO GEARHART, RA MARUYAMA, XK AF PIESTRUP, MA MORAN, MJ BOYERS, DG PINCUS, CI KEPHART, JO GEARHART, RA MARUYAMA, XK TI GENERATION OF HARD X-RAYS FROM TRANSITION RADIATION USING HIGH-DENSITY FOILS AND MODERATE-ENERGY ELECTRONS SO PHYSICAL REVIEW A LA English DT Article ID PERIODIC RADIATORS AB In experiments using targets consisting of many thin metal foils, we have demonstrated that a narrow, forward-directed cone of transition radiation in the 8- to 60-ke V spectral range can be generated by electron beams with moderate energies (between 100 and 500 MeV). The theory suggests that high-density, moderate-atomic-number metals are the optimum foil materials and that the foil thickness can be chosen to maximize photon production within a desired spectral range. The three targets used in the experiments consisted of 10 foils of 1-mu-m-thick gold, 40 foils of 8.5-mu-m stainless steel, and 20 foils of 7.9-mu-m copper. The efficiency with which hard x rays are generated, and the fact that the requisite electron-beam energies are lower by a factor of 5 to 10, make such a radiation source an attractive alternative to synchrotron radiation for applications such as medical imaging, spectroscopy, and microscopy. C1 UNIV CALIF LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550. IBM CORP,THOMAS J WATSON RES CTR,YORKTOWN HTS,NY 10598. STANFORD UNIV,STANFORD LINEAR ACCELERATOR CTR,STANFORD,CA 94305. USN,POSTGRAD SCH,MONTEREY,CA 93943. RP PIESTRUP, MA (reprint author), ADELPHI TECHNOL INC,285 HAMILTON AVE,SUITE 430,PALO ALTO,CA 94301, USA. NR 25 TC 13 Z9 14 U1 1 U2 1 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1050-2947 J9 PHYS REV A JI Phys. Rev. A PD MAR 1 PY 1991 VL 43 IS 5 BP 2387 EP 2396 DI 10.1103/PhysRevA.43.2387 PG 10 WC Optics; Physics, Atomic, Molecular & Chemical SC Optics; Physics GA EZ702 UT WOS:A1991EZ70200029 ER PT J AU DOSCHEK, GA FELDMAN, U BHATIA, AK AF DOSCHEK, GA FELDMAN, U BHATIA, AK TI INTENSITIES OF THE NEONLIKE IRON (FE-16+) 2P53S-2P53P AND 2P53P-2P53D TRANSITIONS IN SOLAR-FLARE SPECTRA SO PHYSICAL REVIEW A LA English DT Note ID COLLISION CROSS-SECTIONS; FE-XVII; ISOELECTRONIC SEQUENCE; LINE RATIOS; EXCITATION; IONS; IDENTIFICATIONS; COEFFICIENTS; STRENGTHS AB We present relative spectral line intensities for 16 3s-3p and 3p-3d transitions in the neonlike ion Fe16+, obtained from solar-flare spectra. The spectra were obtained by a Naval Research Laboratory slitless spectrograph flown on the Skylab manned space station. The results are of relevance to x-ray-laser experiments involving collisional pumping of excited states of neonlike ions, and to the analysis of solar-flare spectra. The relative line intensities are measured to an accuracy of about 30%. The measured line intensities are compared with theoretical line intensities calculated assuming electron collisional excitation within the Fe16+ ion followed by deexcitation and radiative decay. The measured and theoretical intensities agree to within less than a factor of 2 for all but one line. The important J = 0 lines (3p 1S0-3s 1P1,3s 3P1) at 254.87 and 204.65 angstrom are about a factor of 1.4 weaker than predicted, which is almost within experimental error. The 3s 3P2-3p 3S1 line at 409.69 angstrom is 2.3 times weaker than predicted, and this is unexplained. C1 NASA,GODDARD SPACE FLIGHT CTR,ASTRON & SOLAR PHYS LAB,GREENBELT,MD 20771. RP DOSCHEK, GA (reprint author), USN,RES LAB,EO HULBURT CTR SPACE RES,WASHINGTON,DC 20375, USA. NR 21 TC 17 Z9 17 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1050-2947 J9 PHYS REV A JI Phys. Rev. A PD MAR 1 PY 1991 VL 43 IS 5 BP 2565 EP 2568 DI 10.1103/PhysRevA.43.2565 PG 4 WC Optics; Physics, Atomic, Molecular & Chemical SC Optics; Physics GA EZ702 UT WOS:A1991EZ70200054 ER PT J AU GUZDAR, PN TAN, W LEE, YC LIU, CS LEHMBERG, RH AF GUZDAR, PN TAN, W LEE, YC LIU, CS LEHMBERG, RH TI THE EFFECT OF INDUCED SPATIAL INCOHERENCE ON THE ABSOLUTE RAMAN INSTABILITY SO PHYSICS OF FLUIDS B-PLASMA PHYSICS LA English DT Article ID PARAMETRIC-INSTABILITY; SCATTERING; PLASMA AB A numerical and analytical study of the Raman instability in a homogeneous plasma is presented in which the pump has been modeled to include the effects of broad bandwidth and the induced spatial incoherence (ISI) method of beam smoothing. For a time-averaged homogeneous growth rate gammaBAR0 and a bandwidth sigma, there is a significant reduction in Raman backscattering when sigma greater-than-or-similar-to 2-gamma-0, for gammaBAR0(2) near threshold intensity. However, for gammaBAR0(2) very large compared to the threshold, neither ISI nor bandwidth affects Raman scattering. C1 USN,RES LAB,WASHINGTON,DC 20375. RP GUZDAR, PN (reprint author), UNIV MARYLAND,PLASMA RES LAB,COLLEGE PK,MD 20742, USA. NR 10 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 0899-8221 J9 PHYS FLUIDS B-PLASMA PD MAR PY 1991 VL 3 IS 3 BP 776 EP 780 DI 10.1063/1.859873 PG 5 WC Physics, Fluids & Plasmas SC Physics GA EZ400 UT WOS:A1991EZ40000030 ER PT J AU ANDERSON, GW WEBB, DC SPEZIO, AE LEE, JN AF ANDERSON, GW WEBB, DC SPEZIO, AE LEE, JN TI ADVANCED CHANNELIZATION TECHNOLOGY FOR RF, MICROWAVE, AND MILLIMETER-WAVE APPLICATIONS SO PROCEEDINGS OF THE IEEE LA English DT Review ID FIELD-EFFECT TRANSISTOR; MONOLITHIC INTEGRATION; ACOUSTOOPTIC DEVICES; GAAS PHOTOCONDUCTORS; IMPACT IONIZATION; DETECTOR ARRAY; LASER ARRAY; BRAGG CELLS; DIODE; SINGLE AB Channelized receivers are being developed for communications and radar applications. They are needed to intercept, sort, and classify a rapidly increasing density of signals per unit time in the radio frequency, microwave, and millimeterwave regions of the electromagnetic spectrum. These new receivers are required because of the incapability of current receivers to intercept the higher density of signals with a high probability of intercept of each signal. Important parameters that must be considered in developing channelized receivers for the simultaneous interception of time-coincident signals are dynamic range, bandwidth, signal processing capability, size, weight, and power consumption. This paper reviews signal processing needs and capabilities, receiver and channelizer technologies, and recent developments in surface-acoustic-wave, bulk-acoustic-wave, magnetostatic-wave, and acousto-optical channelizer technologies. RP ANDERSON, GW (reprint author), USN,RES LAB,MICROWAVE TECHNOL BRANCH,WASHINGTON,DC 20375, USA. NR 142 TC 46 Z9 49 U1 2 U2 11 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0018-9219 J9 P IEEE JI Proc. IEEE PD MAR PY 1991 VL 79 IS 3 BP 355 EP 388 DI 10.1109/5.75091 PG 34 WC Engineering, Electrical & Electronic SC Engineering GA FE129 UT WOS:A1991FE12900008 ER PT J AU TRENT, LK AF TRENT, LK TI PREVALENCE OF ELEVATED SERUM-CHOLESTEROL IN PERSONNEL OF THE UNITED-STATES NAVY SO PUBLIC HEALTH REPORTS LA English DT Article ID CORONARY HEART-DISEASE; FRAMINGHAM AB Fasting blood lipid profiles were collected for 5,487 active duty Navy men and women presenting for routine physical examinations. Mean serum cholesterol for the sample (mean age 33.6 years) was 208.2 milligrams per deciliter (mg per dL). Cholesterol level increased with age, decreased with education, and was higher in men than in women. Using the Navy's own risk cutpoints for total cholesterol (200 mg per dL for ages 18-24, 220 mg per dL for ages 25 and older), 36.9 percent of the sample were found to be at risk. When the percentage of the population at risk was computed using the guidelines suggested by the National Institutes of Health Consensus Conference, rather than the Navy's cutpoints, results were almost identical (36.3 percent at risk); when based on the National Cholesterol Education Program's recommended cutpoints, the percent at risk was considerably higher (55.4 percent). Risk estimates that included LDL- or HDL-cholesterol risk levels (or both) also were higher. A larger percentage of Navy personnel were at risk because of total cholesterol than were persons in an age-adjusted national sample. However, because routine examinations generally are not given until first reenlistment, the Navy sample underrepresented younger service members, and results may overestimate the prevalence of hypercholesterolemia in the Navy at large. The author draws attention to the problem of lack of standardization in cholesterol testing and notes that the Navy does not yet participate in an external quality control program. The difficulty in setting appropriate risk cutpoints, given the complexity of factors that must be considered as well as the general unreliability of cholesterol tests, is also discussed. RP TRENT, LK (reprint author), NAVAL HLTH RES CTR,HLTH SERV RES DEPT,POB 85122,SAN DIEGO,CA 92186, USA. NR 29 TC 2 Z9 2 U1 0 U2 0 PU US GOVERNMENT PRINTING OFFICE PI WASHINGTON PA SUPT OF DOCUMENTS, WASHINGTON, DC 20402-9325 SN 0033-3549 J9 PUBLIC HEALTH REP JI Public Health Rep. PD MAR-APR PY 1991 VL 106 IS 2 BP 167 EP 175 PG 9 WC Public, Environmental & Occupational Health SC Public, Environmental & Occupational Health GA FF817 UT WOS:A1991FF81700010 PM 1902309 ER PT J AU VOLZ, RA LUI, S WILCOX, D AF VOLZ, RA LUI, S WILCOX, D TI MAINTAINING GLOBAL TIME IN FUTUREBUS + SO REAL-TIME SYSTEMS LA English DT Article AB IEEE 896 Futurebus + is a major open standard that is supported by the VME International Trade Association, the MultiBus Manufacturer's Group and the US Navy. Futurebus + supports, among other things, the notion that each processor can have its own clock. In this paper, we present design considerations of the Futurebus + clocks and their synchronization. C1 TEXAS A&M UNIV SYST,DEPT COMP SCI,COLLEGE STN,TX 77843. CARNEGIE MELLON UNIV,INST SOFTWARE INST,PITTSBURGH,PA 15213. USN,CTR OCEAN SYST,SAN DIEGO,CA 92152. NR 16 TC 1 Z9 1 U1 0 U2 0 PU KLUWER ACADEMIC PUBL PI DORDRECHT PA SPUIBOULEVARD 50, PO BOX 17, 3300 AA DORDRECHT, NETHERLANDS SN 0922-6443 J9 REAL-TIME SYST JI Real-Time Syst. PD MAR PY 1991 VL 3 IS 1 BP 5 EP 17 DI 10.1007/BF00365390 PG 13 WC Computer Science, Theory & Methods SC Computer Science GA FL148 UT WOS:A1991FL14800001 ER PT J AU LOONEY, RE AF LOONEY, RE TI DIVERSIFICATION IN A SMALL OIL EXPORTING ECONOMY - THE IMPACT OF THE DUTCH DISEASE ON KUWAITS INDUSTRIALIZATION SO RESOURCES POLICY LA English DT Article AB The purpose of this paper is to examine Kuwaiti industrial development and, in particular, several Dutch disease factors - the impact of the movements in the real exchange rate and the relative rates of sectoral inflation on the country's pattern of development. The Dutch disease was found to be particularly strong in the years immediately prior to the oil price declines in 1982. However, even before the 1990 invasion of Kuwait, and based on oil market forecasts at the time, analysis suggests that devaluation of the country's currency would not necessarily have resulted in a major expansion of industrial output. RP LOONEY, RE (reprint author), USN,POSTGRAD SCH,MONTEREY,CA 93943, USA. NR 9 TC 0 Z9 0 U1 0 U2 0 PU BUTTERWORTH-HEINEMANN LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, OXON, ENGLAND OX5 1GB SN 0301-4207 J9 RESOUR POLICY JI Resour. Policy PD MAR PY 1991 VL 17 IS 1 BP 31 EP 41 DI 10.1016/0301-4207(91)90024-P PG 11 WC Environmental Studies SC Environmental Sciences & Ecology GA FD339 UT WOS:A1991FD33900004 ER PT J AU HAWKINS, RE MORIARTY, RA LEWIS, DE OLDFIELD, EC AF HAWKINS, RE MORIARTY, RA LEWIS, DE OLDFIELD, EC TI SERIOUS INFECTIONS INVOLVING THE CDC GROUP VE BACTERIA CHRYSEOMONAS-LUTEOLA AND FLAVIMONAS-ORYZIHABITANS SO REVIEWS OF INFECTIOUS DISEASES LA English DT Review ID AMBULATORY PERITONEAL-DIALYSIS; HUMAN CLINICAL SPECIMENS; PSEUDOMONAS-ORYZIHABITANS; CHROMOBACTERIUM-TYPHIFLAVUM; GEN-NOV; SEPTICEMIA; PATIENT AB Chryseomonas luteola and Flavimonas oryzihabitans are phenotypically similar gram-negative bacilli and are also referred to as CDC groups Ve-1 and Ve-2, respectively. These bacteria are rarely reported as pathogens in humans. Infections described in the literature include primarily bacteremia in critically ill patients and peritonitis in patients undergoing continuous ambulatory peritoneal dialysis. We describe three cases of polymicrobial infection secondary to infection with group Ve organisms, including the first reported case (to our knowledge) of CNS infection due to F. oryzihabitans. These three cases and a review of literature suggest an association between the presence of indwelling catheters and polymicrobial infections with CDC group Ve organisms. F. oryzihabitans and C. luteola should be added to the expanding list of nosocomial pathogens with a propensity to infect critically ill patients who have undergone surgical procedures and/or had indwelling catheters placed. The isolation of either of these organisms from clinical specimens should prompt a search for a device-related source. C1 NATL NAVAL MED CTR, DEPT PEDIAT, BETHESDA, MD 20814 USA. USN HOSP, SAN DIEGO, CA 92134 USA. RP HAWKINS, RE (reprint author), NATL NAVAL MED CTR, DEPT INTERNAL MED, DIV INFECT DIS, BETHESDA, MD 20814 USA. NR 19 TC 33 Z9 33 U1 1 U2 1 PU UNIV CHICAGO PRESS PI CHICAGO PA 5720 S WOODLAWN AVE, CHICAGO, IL 60637 SN 0162-0886 J9 REV INFECT DIS PD MAR-APR PY 1991 VL 13 IS 2 BP 257 EP 260 PG 4 WC Immunology; Microbiology SC Immunology; Microbiology GA FD047 UT WOS:A1991FD04700012 PM 2041957 ER PT J AU ROLAND, CM BUCKLEY, GS AF ROLAND, CM BUCKLEY, GS TI THERMAL CRYSTALLIZATION OF POLYTETRAHYDROFURAN NETWORKS SO RUBBER CHEMISTRY AND TECHNOLOGY LA English DT Article ID POLY(TETRAMETHYLENE OXIDE) C1 CAMERON UNIV,LAWTON,OK 73505. RP ROLAND, CM (reprint author), USN,RES LAB,DIV CHEM,CODE 6120,WASHINGTON,DC 20375, USA. NR 22 TC 15 Z9 15 U1 0 U2 1 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 MAR-APR PY 1991 VL 64 IS 1 BP 74 EP 82 DI 10.5254/1.3538542 PG 9 WC Polymer Science SC Polymer Science GA FR670 UT WOS:A1991FR67000007 ER PT J AU EVERETT, RK HIGBY, PL AF EVERETT, RK HIGBY, PL TI EXPANSIVITY OF DIBORIDE-PARTICULATE ALUMINUM COMPOSITES SO SCRIPTA METALLURGICA ET MATERIALIA LA English DT Article ID MATRIX COMPOSITES; FRACTURE; STRESS RP EVERETT, RK (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. OI Everett, Richard/0000-0002-6725-9442 NR 12 TC 10 Z9 10 U1 1 U2 1 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0956-716X J9 SCRIPTA METALL MATER JI Scr. Metall. Materialia PD MAR PY 1991 VL 25 IS 3 BP 625 EP 630 DI 10.1016/0956-716X(91)90103-8 PG 6 WC Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Materials Science; Metallurgy & Metallurgical Engineering GA EZ877 UT WOS:A1991EZ87700023 ER PT J AU LOONEY, RE AF LOONEY, RE TI A MONETARY APPROACH TO MOVEMENTS IN CARIBBEAN BALANCE OF PAYMENTS SO SOCIAL AND ECONOMIC STUDIES LA English DT Article C1 USN,POSTGRAD SCH,MONTEREY,CA 93940. NR 15 TC 2 Z9 2 U1 0 U2 0 PU INST SOCIAL ECON RES PI MONA KINGSTON PA UNIV WEST INDIES, MONA KINGSTON 7, JAMAICA SN 0037-7651 J9 SOC ECON STUD JI Soc. Econ. Stud. PD MAR PY 1991 VL 40 IS 1 BP 105 EP 132 PG 28 WC Social Sciences, Interdisciplinary SC Social Sciences - Other Topics GA FX469 UT WOS:A1991FX46900005 ER PT J AU BROWN, JR PHILLIPS, JR AF BROWN, JR PHILLIPS, JR TI SURVIVAL OF MICROPLITIS-CROCEIPES IN HELIOTHIS NPV-INFECTED HELIOTHIS-VIRESCENS LARVAE SO SOUTHWESTERN ENTOMOLOGIST LA English DT Article ID NUCLEAR POLYHEDROSIS-VIRUS; LEPIDOPTERA-NOCTUIDAE; HYMENOPTERA; BRACONIDAE AB Time between oviposition and ingestion of nuclear polyhedral virus (NPV) (570, 40 and 20 polyhedral inclusion bodies per mm2 of diet surface) was found to be critical in the emergence of Microplitis croceipes (Cresson) from NPV-infected third-instar Heliothis virescens (Fab.). Parasitoid emergence was significantly reduced in host larvae exposed to NPV up to 3 days after oviposition at 26-degrees-C. C1 UNIV ARKANSAS,DEPT ENTOMOL,FAYETTEVILLE,AR 72701. RP BROWN, JR (reprint author), USN,CTR DIS VECTOR ECOL & CONTROL,BOX 43,NAS,JACKSONVILLE,FL 32212, USA. NR 17 TC 0 Z9 1 U1 0 U2 0 PU SOUTHWESTERN ENTOMOLOGICAL SOC PI DALLAS PA 17360 COIT RD, DALLAS, TX 75252-6599 SN 0147-1724 J9 SOUTHWEST ENTOMOL JI Southw. Entomol. PD MAR PY 1991 VL 16 IS 1 BP 25 EP 29 PG 5 WC Entomology SC Entomology GA FK935 UT WOS:A1991FK93500004 ER PT J AU HABERBERGER, RL MIKHAIL, IA TANIOUS, AI AF HABERBERGER, RL MIKHAIL, IA TANIOUS, AI TI ISOLATION OF YERSINIA-ENTEROCOLITICA IN ALEXANDRIA, EGYPT SO TRANSACTIONS OF THE ROYAL SOCIETY OF TROPICAL MEDICINE AND HYGIENE LA English DT Note C1 ANIM HLTH CARE RES INST,CAIRO,EGYPT. RP HABERBERGER, RL (reprint author), USN,RES PUBLICAT BRANCH,MED RES UNIT 3,NEW YORK,NY 09527, USA. NR 8 TC 0 Z9 0 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 MAR-APR PY 1991 VL 85 IS 2 BP 305 EP 305 DI 10.1016/0035-9203(91)90069-B PG 1 WC Public, Environmental & Occupational Health; Tropical Medicine SC Public, Environmental & Occupational Health; Tropical Medicine GA FN691 UT WOS:A1991FN69100052 PM 1887497 ER PT J AU LEWIS, DE WALLACE, MR AF LEWIS, DE WALLACE, MR TI TREATMENT OF ADULT SYSTEMIC CAT SCRATCH DISEASE WITH GENTAMICIN SULFATE SO WESTERN JOURNAL OF MEDICINE LA English DT Note ID BACTERIAL-INFECTION; AGENT C1 USN HOSP,DEPT INTERNAL MED INFECT DIS,SAN DIEGO,CA 92134. RP LEWIS, DE (reprint author), USN HOSP,DEPT CLIN INVEST,SAN DIEGO,CA 92134, USA. NR 13 TC 14 Z9 14 U1 0 U2 0 PU CALIFORNIA PHYSICIAN MAGAZINE PI SAN FRANCISCO PA C/O DONNA TAYLOR, EDITOR, PO BOX 7690, SAN FRANCISCO, CA 94102-7690 SN 0093-0415 J9 WESTERN J MED JI West. J. Med. PD MAR PY 1991 VL 154 IS 3 BP 330 EP 331 PG 2 WC Medicine, General & Internal SC General & Internal Medicine GA FB757 UT WOS:A1991FB75700018 PM 2028603 ER PT J AU CHU, PC GARWOOD, RW AF CHU, PC GARWOOD, RW TI ON THE 2-PHASE THERMODYNAMICS OF THE COUPLED CLOUD-OCEAN MIXED LAYER SO JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS LA English DT Article; Proceedings Paper CT WESTERN PACIFIC INTERNATIONAL MEETING AND WORKSHOP ON TOGA/COARE ( TROPICAL OCEAN GLOBAL ATMOSPHERE/COUPLED OCEAN-ATMOSPHERE RESPONSE EXPERIMENT ) CY MAY 24-30, 1989 CL CTR ORSTOM NOUMEA, NOUMEA, NEW CALEDONIA HO CTR ORSTOM NOUMEA ID OSCILLATION; TEMPERATURE; CONVECTION; PACIFIC; ENSO AB The rudiments of a self-consistent two-phase thermodynamical theory of intraseasonal and interannual variability for the tropical cloud-ocean mixed layer system are presented. In this paper we study some basic properties of low-frequency phenomena in the tropical coupled cloud-ocean mixed layer system under low mean wind speed conditions and attempt to seek a unified thermodynamical framework in which the thermodynamical oscillation can be studied and understood. In order to do so, all waves in the atmosphere and in the ocean are initially filtered out, and the coupled system is purely thermodynamic. An air-ocean coupled model designed especially for the low wind speed condition is employed to test the basic thermodynamic feedback mechanism between clouds and the ocean mixed layer. The model has four parts: (1) a shallow-water system for the large-scale atmosphere motion; (2) a cloud model, (3) a marine atmospheric boundary layer, in which the physical processes are parameterized into the bulk formulae through a geostrophic drag coefficient and corresponding heat and moisture exchange coefficients; and (4) an oceanic mixed layer model. The coupled model is solved analytically as an eigenvalue problem. Three nondimensional model parameters are found to be very important in separating growing or decaying, oscillatory or nonoscillatory modes: (1) the ocean surface stability index, epsilon; (2) the surface water budget index, gamma; and (3) the mean diapycnal gradient of the spiciness (chi) in the entrainment zone, delta. The sign of epsilon divides the ocean mixed layer into shallowing (epsilon > 0) and entrainment (epsilon < 0) regimes. The value of gamma indicates the strength of the water budget versus the heat budget at the ocean surface. The net freshwater influx (e.g., precipitation exceeding evaporation) destabilizes the coupled cloud and ocean mixed layer. In the entrainment regime, however, the parameter delta becomes important. The unstable oscillation only appears when the entrainment zone is salinity dominated. When delta exceeds a criterion that depends upon epsilon and gamma, the oscillatorily growing modes will be generated. The model results show that the criteria are: delta > 20-epsilon + 11 for gamma = -0.1, delta > 20-epsilon + 11.8 for gamma = 0.2, and delta > 20-epsilon + 14.6 for gamma = -0.5. The model results also demonstrate that the exchanges of heat and water across the sea surface lead to both growing and decaying modes of oscillation on two different time scales, owing to the stability of the atmosphere. For an unstable atmosphere the time scale is about 20-30 days. However, the time scale is approximately 1-3 years for a stable atmosphere. This work introduces the new concept of two-phase thermodynamics for the coupled air-ocean system. Both atmosphere and ocean have two important thermodynamical variables: temperature and moisture (or fractional cloudiness) for the atmosphere, and temperature and salinity for the ocean. If salinity is neglected in the ocean model, no positive feedback mechanism will be possible in the coupled air-ocean system. RP CHU, PC (reprint author), USN,POSTGRAD SCH,DEPT OCEANOG,MONTEREY,CA 93943, USA. NR 19 TC 13 Z9 13 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 FEB 28 PY 1991 VL 96 SU S BP 3425 EP 3436 PG 12 WC Oceanography SC Oceanography GA FB521 UT WOS:A1991FB52100024 ER PT J AU CAFFREY, M HOGAN, J RUDOLPH, AS AF CAFFREY, M HOGAN, J RUDOLPH, AS TI DIACETYLENIC LIPID MICROSTRUCTURES - STRUCTURAL CHARACTERIZATION BY X-RAY-DIFFRACTION AND COMPARISON WITH THE SATURATED PHOSPHATIDYLCHOLINE ANALOG SO BIOCHEMISTRY LA English DT Article ID THERMOTROPIC PHASE-BEHAVIOR; POLYMERIZABLE PHOSPHOLIPIDS; BILAYER-MEMBRANES; GEL PHASE; LECITHIN; TUBULES; LIPOSOMES; VESICLES; POLYMORPHISM; MECHANISM AB Thermotropic and lyotropic mesomorphism in the polymerizable lecithin 1,2-ditricosa-10,12-diynoyl-sn-glycero-3-phosphocholine and its saturated analogue, 1,2-ditricosanoyl-sn-glycero-3-phosphocholine, has been investigated by wide- and low-angle X-ray diffraction of both powder and oriented samples and by differential scanning calorimetry. Previous studies have shown that the hydrated diacetylenic lipid forms novel microstructures (tubules and stacked bilayer sheets) in its low-temperature phase. The diffraction results indicate that at low temperatures fully hydrated tubules and sheets have an identical lamellar repeat size (d00l = 66.4 angstrom) and crystalline-like packing of the acyl chains. Chain packing in the lamellar crystalline phase is hydration independent. A model for the polymerizable lecithin with (1) fully extended all-trans methylene segments, (2) a long-axis tilt of 32-degrees, and (3) minimal chain interdigitation seems most reasonable on energetic grounds, is consistent with the diffraction data (to 3.93-angstrom resolution), and is likely to support facile polymerization. Above the chain "melting" transition the lamellar repeat of the polymerizable lipid increases to 74 angstrom. The conformational similarity between tubules, sheets, and the dry powder is corroborated by calorimetry, which reveals a cooling exotherm at the same temperature where tubules form upon cooling hydrated sheets. The data suggest that although a high degree of conformational order is a pertinent feature of tubules, this character alone is not sufficient to account for tubule formation. The conformation of the corresponding saturated phosphatidylcholine appears to be similar to that of other saturated phosphatidylcholines in the lamellar gel phase. Furthermore, above the main transition temperature, the dry, saturated lipid shows evidence of a P-delta phase (112-degrees-C), whereas the diacetylenic lipid appears to exhibit a centered rectangular phase, R-alpha (55-degrees-C). C1 USN,RES LAB,CTR BIOMOLEC ENGN,WASHINGTON,DC 20375. RP CAFFREY, M (reprint author), OHIO STATE UNIV,DEPT CHEM,120 W 18TH AVE,COLUMBUS,OH 43210, USA. FU NCRR NIH HHS [RR01646]; NHLBI NIH HHS [HL-18255]; NIDDK NIH HHS [DK36849] NR 53 TC 60 Z9 60 U1 0 U2 8 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0006-2960 J9 BIOCHEMISTRY-US JI Biochemistry PD FEB 26 PY 1991 VL 30 IS 8 BP 2134 EP 2146 DI 10.1021/bi00222a018 PG 13 WC Biochemistry & Molecular Biology SC Biochemistry & Molecular Biology GA EZ602 UT WOS:A1991EZ60200018 PM 1998674 ER PT J AU FATEMI, M STAHLBUSH, RE AF FATEMI, M STAHLBUSH, RE TI X-RAY ROCKING CURVE MEASUREMENT OF COMPOSITION AND STRAIN IN SI-GE BUFFER LAYERS GROWN ON SI SUBSTRATES SO APPLIED PHYSICS LETTERS LA English DT Article ID EPITAXIAL LAYERS AB The level of strain and the fraction of Ge in SiGe layers grown on Si can be found rapidly and unambiguously using double-crystal x-ray diffraction and a simple application of the linear elasticity theory combined with Vegard's law. The method gives excellent results for 0.4-mu-m-thick buffer layers of SiGe/Si containing 5%-50% germanium. It is shown that lattice relaxation rises abruptly at chi(Ge) greater-than-or-equal-to 15%, and that some strain remains for chi(Ge) as high as 50%. RP FATEMI, M (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 8 TC 76 Z9 78 U1 3 U2 13 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 FEB 25 PY 1991 VL 58 IS 8 BP 825 EP 827 DI 10.1063/1.104501 PG 3 WC Physics, Applied SC Physics GA EZ142 UT WOS:A1991EZ14200014 ER PT J AU JENSEN, KL BUOT, FA AF JENSEN, KL BUOT, FA TI NUMERICAL-SIMULATION OF INTRINSIC BISTABILITY AND HIGH-FREQUENCY CURRENT OSCILLATIONS IN RESONANT TUNNELING STRUCTURES SO PHYSICAL REVIEW LETTERS LA English DT Article ID BARRIER STRUCTURES; DEVICES; DIODE AB Intrinsic high-frequency oscillations (almost-equal-to 2.5 THz) in current and corresponding quantum-well density have been simulated for the first time for a fixed-bias voltage in the negative differential resistance (NDR) region of the current-voltage (I-V) characteristics of a resonant tunneling diode. Scattering and self-consistency are included. Hysteresis and "plateaulike" behavior of the time-averaged I-V curve are simulated in the NDR region. Intrinsic bistability is manifested by the phenomenon of unstable electron charge buildup and ejection from the quantum well. 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 136 Z9 137 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 FEB 25 PY 1991 VL 66 IS 8 BP 1078 EP 1081 DI 10.1103/PhysRevLett.66.1078 PG 4 WC Physics, Multidisciplinary SC Physics GA EZ134 UT WOS:A1991EZ13400029 ER PT J AU COHN, JL WOLF, SA SELVAMANICKAM, V SALAMA, K AF COHN, JL WOLF, SA SELVAMANICKAM, V SALAMA, K TI THERMOELECTRIC-POWER OF YBA2CU3O7-DELTA - PHONON DRAG AND MULTIBAND CONDUCTION SO PHYSICAL REVIEW LETTERS LA English DT Article ID HIGH-TC SUPERCONDUCTORS; THERMOPOWER; STATE; YBA2CU3O7-DELTA; DENSITY AB We report measurements of the a-b-plane thermopower (S) on crystalline YBa2Cu3O7-delta (delta-less-than-or-equal-to 0.16) for temperatures below 310 K. Much sharper features in the T dependence of S are observed than have been previously reported. Both the temperature and oxygen-doping dependences of S, which have caused confusion, are consistently accounted for by conventional metallic theory for the first time. Strong phonon drag and two carrier species are indicated, with holes on the planes and electrons on the chains. An anomalous, positive component to S, observed for T < 160 K, is attributed to a freeze-out of carrier-phonon umklapp processes involving holes in the CuO2 planes and optical-mode phonons. C1 UNIV HOUSTON,TEXAS CTR SUPERCONDUCT,HOUSTON,TX 77004. RP COHN, JL (reprint author), USN,RES LAB,MAT PHYS BRANCH,WASHINGTON,DC 20375, USA. RI Wolf, Stuart/A-7513-2009 NR 38 TC 92 Z9 92 U1 3 U2 16 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 FEB 25 PY 1991 VL 66 IS 8 BP 1098 EP 1101 DI 10.1103/PhysRevLett.66.1098 PG 4 WC Physics, Multidisciplinary SC Physics GA EZ134 UT WOS:A1991EZ13400034 ER PT J AU SOMMERER, JC DITTO, WL GREBOGI, C OTT, E SPANO, ML AF SOMMERER, JC DITTO, WL GREBOGI, C OTT, E SPANO, ML TI EXPERIMENTAL CONFIRMATION OF THE THEORY FOR CRITICAL EXPONENTS OF CRISES SO PHYSICS LETTERS A LA English DT Article ID INDUCED INTERMITTENCY; CHAOTIC ATTRACTORS; TRANSIENT CHAOS; NOISE; OSCILLATOR AB We investigate the scaling of the average time tau between intermittent bursts for a chaotic system that undergoes a homoclinic tangency crisis, which causes a sudden expansion in the attractor. The system studied is a periodically driven (frequency f), nonlinear, magnetoelastic ribbon. The observed behavior of tau is well fit by a power-law scaling tau approximately \f-f(c)\-gamma, where f = f(c) at the crisis. We identify the unstable periodic orbit mediating the crisis, and determine its linearized eigenvalues from experimental data. The critical exponent gamma found from the scaling of tau is shown to agree with that theoretically predicted for a two-dimensional map on the basis of the eigenvalues of the mediating periodic orbit. C1 APPL PHYS LAB,LAUREL,MD 20707. USN,CTR SURFACE WARFARE,SILVER SPRING,MD 20903. RP SOMMERER, JC (reprint author), UNIV MARYLAND,COLLEGE PK,MD 20742, USA. RI Spano, Mark/B-6883-2011; O, E/F-1630-2015 NR 22 TC 30 Z9 30 U1 0 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0375-9601 J9 PHYS LETT A JI Phys. Lett. A PD FEB 25 PY 1991 VL 153 IS 2-3 BP 105 EP 109 DI 10.1016/0375-9601(91)90848-3 PG 5 WC Physics, Multidisciplinary SC Physics GA FA199 UT WOS:A1991FA19900008 ER PT J AU CHINN, PZ RICHTER, RB TRUSZCZYNSKI, M AF CHINN, PZ RICHTER, RB TRUSZCZYNSKI, M TI PRIMAL GRAPHS WITH SMALL DEGREES SO DISCRETE MATHEMATICS LA English DT Article AB It has previously been shown that there is a unique set II of primal graphs such that every graph has an edge-decomposition into non-isomorphic elements of II and that the only decomposition of an element of II into non-isomorphic elements of II is the obvious one. Here it is shown that there are infinitely many elements of II even among graphs having a relatively simple structure. On the other hand, within this same class of graphs, we show that 'most' of them are not primal. C1 USN ACAD,ANNAPOLIS,MD 21402. UNIV KENTUCKY,LEXINGTON,KY 40506. RP CHINN, PZ (reprint author), HUMBOLDT STATE UNIV,ARCATA,CA 95521, USA. NR 4 TC 0 Z9 0 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0012-365X J9 DISCRETE MATH JI Discret. Math. PD FEB 22 PY 1991 VL 87 IS 3 BP 237 EP 248 DI 10.1016/0012-365X(91)90133-M PG 12 WC Mathematics SC Mathematics GA FD234 UT WOS:A1991FD23400002 ER PT J AU FISHMAN, GJ HARMON, BA GREGORY, JC PARNELL, TA PETERS, P PHILLIPS, GW KING, SE AUGUST, RA RITTER, JC CUTCHIN, JH HASKINS, PS MCKISSON, JE ELY, DW WEISENBERGER, AG PIERCEY, RB DYBLER, T AF FISHMAN, GJ HARMON, BA GREGORY, JC PARNELL, TA PETERS, P PHILLIPS, GW KING, SE AUGUST, RA RITTER, JC CUTCHIN, JH HASKINS, PS MCKISSON, JE ELY, DW WEISENBERGER, AG PIERCEY, RB DYBLER, T TI OBSERVATION OF BE-7 ON THE SURFACE OF LDEF SPACECRAFT SO NATURE LA English DT Article ID TROPOSPHERE; BERYLLIUM-7; STRATOSPHERE; TRANSPORT; EXCHANGE; AIR AB THE Long Duration Exposure Facility (LDEF), an orbiting unmanned satellite, was recently returned to Earth after almost six years in space. From radioactivity measurements, we have found significant quantities of the isotope Be-7 on the leading edge (but only on the leading edge) of LDEF. Although the absolute atmospheric concentration of Be-7 needed to explain this detection is extremely small (10(-7) atoms cm-3), it concentration of LDEF's altitude (310 km) must be several orders of magnitude higher than in the stratosphere below, where it is produced by cosmic-ray reactions with atmospheric nitrogen and oxygen nuclei. To explain the presence of Be-7 on the surface of LDEF, it must first be rapidly and efficiently transported to high altitudes, and then adsorbed onto the surface of the spacecraft. Neither process had been expected. Our detection may therefore lead to the use of Be-7 as an exo-atmospheric tracer, as well as to studies of surface interactions in space. C1 UNIV SPACE RES ASSOC,HUNTSVILLE,AL 35806. UNIV ALABAMA,DEPT CHEM,HUNTSVILLE,AL 35899. SACHS FREEMAN ASSOCIATES INC,WASHINGTON,DC 20375. UNIV FLORIDA,GAINESVILLE,FL 32609. INST SPACE SCI & TECHNOL,GAINESVILLE,FL 32609. MISSISSIPPI STATE UNIV,DEPT PHYS,MISSISSIPPI STATE,MS 39762. USN,RES LAB,WASHINGTON,DC 20375. RP FISHMAN, GJ (reprint author), NASA,GEORGE C MARSHALL SPACE FLIGHT CTR,SPACE SCI LAB,CODE ES62,HUNTSVILLE,AL 35812, USA. NR 17 TC 10 Z9 10 U1 0 U2 0 PU MACMILLAN MAGAZINES LTD PI LONDON PA 4 LITTLE ESSEX STREET, LONDON, ENGLAND WC2R 3LF SN 0028-0836 J9 NATURE JI Nature PD FEB 21 PY 1991 VL 349 IS 6311 BP 678 EP 680 DI 10.1038/349678a0 PG 3 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA EY627 UT WOS:A1991EY62700040 ER PT J AU STACK, GM MILLER, JM CHANG, EY AF STACK, GM MILLER, JM CHANG, EY TI DEVELOPMENT OF SEAWATER-RESISTANT POLYURETHANE ELASTOMERS FOR USE AS SONAR ENCAPSULANTS SO JOURNAL OF APPLIED POLYMER SCIENCE LA English DT Article ID ACOUSTIC PROPERTIES; SOUND AB Polyurethane systems based on aliphatic diisocyanates were evaluated for suitability for use as underwater transducer encapsulants. A preliminary evaluation was performed to select the most promising urethane systems for further development. An investigation was then undertaken to determine the effect of compositional changes on the properties of these urethanes. The compositional parameters investigated were the soft-segment molecular weight, the prepolymer isocyanate content, the composition of the cure formulation, and the cure stoichiometry. These urethanes were subjected to long-term aging in seawater. It was found that this exposure did not significantly effect the physical or dynamic mechanical properties of the urethane. C1 AMER CYANAMID CO,BRIDGEWATER,NJ 08807. RP STACK, GM (reprint author), USN,RES LAB,UNDERWATER SOUND REFERENCE DETACHMENT,POB 568337,ORLANDO,FL 32856, USA. NR 13 TC 8 Z9 9 U1 2 U2 4 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 FEB 20 PY 1991 VL 42 IS 4 BP 911 EP 923 DI 10.1002/app.1991.070420405 PG 13 WC Polymer Science SC Polymer Science GA EU619 UT WOS:A1991EU61900005 ER PT J AU PANDEY, KC KAXIRAS, E AF PANDEY, KC KAXIRAS, E TI ENTROPY CALCULATION BEYOND THE HARMONIC APPROXIMATION - APPLICATION TO DIFFUSION BY CONCERTED EXCHANGE IN SI SO PHYSICAL REVIEW LETTERS LA English DT Article ID SILICON; INTERSTITIALS; MIGRATION AB We present a formulation for calculating entropy based on the application of classical transition-rate theory to quantum-mechanical energy surfaces. Using this approach, which avoids difficulties due to anharmonicity and large energy barriers, we calculate the entropy of concerted exchange (CE) in Si and find it to be 3.3k in the high-temperature regime. The relatively high entropy of CE is traced to multiple equivalent exchange paths and to a combination of a stiff mode at the equilibrium and a soft mode at the saddle-point configurations. Comparison to harmonic-approximation results shows substantial differences, both in the low- and in the high-temperature limits. C1 USN,RES LAB,COMPLEX SYST THEORY BRANCH,WASHINGTON,DC 20375. RP PANDEY, KC (reprint author), IBM CORP,THOMAS J WATSON RES CTR,DIV RES,YORKTOWN HTS,NY 10598, USA. NR 15 TC 38 Z9 39 U1 0 U2 5 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0031-9007 J9 PHYS REV LETT JI Phys. Rev. Lett. PD FEB 18 PY 1991 VL 66 IS 7 BP 915 EP 918 DI 10.1103/PhysRevLett.66.915 PG 4 WC Physics, Multidisciplinary SC Physics GA EX578 UT WOS:A1991EX57800019 ER PT J AU GILARDI, R FLIPPENANDERSON, JL GEORGE, C AF GILARDI, R FLIPPENANDERSON, JL GEORGE, C TI STRUCTURE OF 2,2-DINITRO-1,3-PROPANEDIYL BIS[(N-PENTAFLUOROSULFANYL)CARBAMATE] (I) AND 2-FLUORO-2,2-DINITROETHYL (N-PENTAFLUOROSULFANYL)CARBAMATE (II) SO ACTA CRYSTALLOGRAPHICA SECTION C-CRYSTAL STRUCTURE COMMUNICATIONS LA English DT Note AB (I), C5H-6F10N4O8S2, M(r) = 504.3, orthorhombic, Pna2(1), a = 10.665 (2), b = 16.097 (3), c = 9.803 (1) angstrom, V = 1682.8 (4) angstrom 3, Z = 4, D(x) = 1.990 Mg m-3, lambda-(Mo K-alpha) = 0.71073 angstrom, mu = 0.45 mm-1, F(000) = 1000, T = 293 K, final R = 0.033, wR = 0.035 for 1545 independent observed reflections. (II), C3H-3F6N3O6S, M(r) = 323.1, orthorhombic, P2(1)2(1)2(1), a = 9.709 (2), b = 23.682 (6), c = 9.156 (3) angstrom, V = 2105.4 (9) angstrom 3, Z = 8 (two molecules in assymmetric unit), D(x) = 2.039 Mg m-3, lambda-(Mo K-alpha) = 0.71073 angstrom, mu = 0.41 mm-1, F(000) = 1280, T = 230 K, final R = 0.055, wR = 0.050 for 1282 independent observed reflections. The N-SF5 geometry is consistent for the four independent occurrences of the group in these two crystal structures. Each time, the carbonyl group is staggered with respect to the SF5 groups (\C-N-S-F\ torsion angles range from 42.3 to 47.5-degrees), and there is a small but recurrent deviation from regular octahedral geometry; e.g. four of the S-F bonds are not quite perpendicular to the N-S bond, with the average angle NSF = 91.7 (9)-degrees in both (I) and (II). There are also small deviations from linearity along the N-S-F 'axis', with the average angle NSF = 178.6 (4)-degrees for (I) and 178.5 (4)-degrees for (II). In both compounds each amine hydrogen participates in an intermolecular hydrogen bond to a carbonyl oxygen. The two molecules in the asymmetric unit of (II) differ primarily in the orientation of the fluorodinitromethyl group with respect to the carbamate chain; the F-C-C-O torsion angles differ by 16.4-degrees and the C-C-O-C torsion angles differ by 28.8-degrees. RP GILARDI, R (reprint author), USN,RES LAB,STRUCT MATTER LAB,WASHINGTON,DC 20375, USA. NR 3 TC 2 Z9 2 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 FEB 15 PY 1991 VL 47 BP 442 EP 445 DI 10.1107/S0108270190006977 PN 2 PG 4 WC Chemistry, Multidisciplinary; Crystallography SC Chemistry; Crystallography GA FA122 UT WOS:A1991FA12200079 ER PT J AU DUVAL, C ELHADAD, J GOTAY, MJ SNIATYCKI, J TUYNMAN, GM AF DUVAL, C ELHADAD, J GOTAY, MJ SNIATYCKI, J TUYNMAN, GM TI QUANTIZATION AND BOSONIC BRST THEORY SO ANNALS OF PHYSICS LA English DT Article ID DYNAMICAL-SYSTEMS; PHASE-SPACE; COHOMOLOGY; CONSTRAINTS; REDUCTION; GHOSTS; FIELDS C1 CNRS,CTR PHYS THEOR,F-13288 MARSEILLE 9,FRANCE. USN ACAD,DEPT MATH,ANNAPOLIS,MD 21402. UNIV CALGARY,DEPT MATH,CALGARY T2N 1N4,ALBERTA,CANADA. UNIV LILLE 1,DEPT MATH,F-59655 VILLENEUVE DASCQ,FRANCE. RP DUVAL, C (reprint author), MATH SCI RES INST,BERKELEY,CA 94720, USA. NR 31 TC 19 Z9 19 U1 0 U2 0 PU ACADEMIC PRESS INC JNL-COMP SUBSCRIPTIONS PI SAN DIEGO PA 525 B ST, STE 1900, SAN DIEGO, CA 92101-4495 SN 0003-4916 J9 ANN PHYS-NEW YORK JI Ann. Phys. PD FEB 15 PY 1991 VL 206 IS 1 BP 1 EP 26 DI 10.1016/0003-4916(91)90218-W PG 26 WC Physics, Multidisciplinary SC Physics GA EY657 UT WOS:A1991EY65700001 ER PT J AU DIALETIS, D LEN, LK GOLDEN, J KAPETANAKOS, CA AF DIALETIS, D LEN, LK GOLDEN, J KAPETANAKOS, CA TI DIFFUSION OF MAGNETIC-FIELDS IN A TOROIDAL CONDUCTING SHELL OF CIRCULAR CROSS-SECTION SO JOURNAL OF APPLIED PHYSICS LA English DT Article AB The diffusion of an external magnetic field through a toroidal conducting shell is studied under the assumption of a small aspect ratio. The external magnetic field can have an arbitrary field index and magnetic flux on the minor axis of the torus. The diffused field, field index, magnetic flux, and wall current are computed analytically and compared with the numerical results from the TRIDIF code. The analytical and numerical results are in good agreement. Measurements in the toroidal chamber of the NRL modified betatron gave a delay time of 34 mu-sec, which is less than 10% from the theoretical prediction of 37-mu-sec. C1 USN,RES LAB,DIV PLASMA PHYS,WASHINGTON,DC 20375. NR 6 TC 1 Z9 1 U1 0 U2 0 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0021-8979 J9 J APPL PHYS JI J. Appl. Phys. PD FEB 15 PY 1991 VL 69 IS 4 BP 1813 EP 1821 DI 10.1063/1.348776 PG 9 WC Physics, Applied SC Physics GA EZ664 UT WOS:A1991EZ66400003 ER PT J AU HERLING, GH RUSTGI, ML AF HERLING, GH RUSTGI, ML TI ELECTRIC-FIELD DEPENDENCE OF OBSERVABLES IN FINITE PARABOLIC QUANTUM-WELLS SO JOURNAL OF APPLIED PHYSICS LA English DT Article ID VARIATIONAL CALCULATIONS; SUPERLATTICE; DEVICE AB The electric-field dependence of eigenvalues, eigenfunctions, electron-hole overlap integrals, and dipole moments in several finite parabolic quantum wells are calculated with the shooting method and compared with corresponding results for a square well. The results are more strongly field dependent for parabolic wells with a fixed-volume integral than those for the square well. Reasons for this behavior are discussed. C1 SUNY BUFFALO,DEPT PHYS & ASTRON,BUFFALO,NY 14260. RP HERLING, GH (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 21 TC 9 Z9 9 U1 0 U2 1 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0021-8979 J9 J APPL PHYS JI J. Appl. Phys. PD FEB 15 PY 1991 VL 69 IS 4 BP 2328 EP 2334 DI 10.1063/1.348715 PG 7 WC Physics, Applied SC Physics GA EZ664 UT WOS:A1991EZ66400076 ER PT J AU OAKES, DB BUTLER, JE SNAIL, KA CARRINGTON, WA HANSSEN, LM AF OAKES, DB BUTLER, JE SNAIL, KA CARRINGTON, WA HANSSEN, LM TI DIAMOND SYNTHESIS IN OXYGEN-ACETYLENE FLAMES - INHOMOGENEITIES AND THE EFFECTS OF HYDROGEN ADDITION SO JOURNAL OF APPLIED PHYSICS LA English DT Article ID CHEMICAL VAPOR-DEPOSITION; MICROWAVE PLASMA; RAMAN-SCATTERING; THIN-FILMS; GROWTH; GRAPHITE; SPECTRUM; PHASE; TORCH; GAS AB Micro-Raman spectroscopy, scanning electron microscopy and a surface density counting technique have been used to probe the inhomogeneities of diamond crystallites grown with an oxygen-acetylene flame on a scratched Si(100) surface. The surface temperature profile was measured using a thermal imaging camera and compared with the observed inhomogeneities in the diamond crystallites. It is concluded that the flame species flux to the surface is the dominant factor contributing to the diamond crystallite inhomogeneities. Hydrogen addition to the oxygen-acetylene flame was studied. The addition of hydrogen reduced the amount of "amorphous" carbon contained in the diamond crystallites as measured with Raman spectroscopy. Growth density profiles were determined as a function of the inner flame front to substrate distance. For uniform growth density in the oxygen-acetylene flame the substrate must be placed in the acetylene feather at a sufficient distance from the inner flame to avoid annular growth. C1 USN,RES LAB,DIV CHEM,WASHINGTON,DC 20375. USN,RES LAB,DIV OPT SCI,WASHINGTON,DC 20375. RI Butler, James/B-7965-2008 OI Butler, James/0000-0002-4794-7176 NR 41 TC 46 Z9 46 U1 1 U2 6 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 FEB 15 PY 1991 VL 69 IS 4 BP 2602 EP 2610 DI 10.1063/1.348651 PG 9 WC Physics, Applied SC Physics GA EZ664 UT WOS:A1991EZ66400121 ER PT J AU KING, FL DUNLAP, BI PARENT, DC AF KING, FL DUNLAP, BI PARENT, DC TI CHARACTERIZATION OF CLUSTER IONS PRODUCED BY THE SPUTTERING OR DIRECT LASER VAPORIZATION OF GROUP-13 METAL (AL, GA, AND IN) OXIDES SO JOURNAL OF CHEMICAL PHYSICS LA English DT Article ID COLLISION-INDUCED DISSOCIATION; ELECTRONIC-STRUCTURE; ALUMINUM CLUSTERS; CARBON-MONOXIDE; OXYGEN; GALLIUM; OXIDATION; DEUTERIUM; MOLECULES; BORON AB The stabilities and reactivities of cluster ions generated from the fast-atom bombardment (FAB) or the direct laser vaporization (DLV) of the Group 13 metal oxides (Al2O3, Ga2O3, and In2O3) were examined by mass spectrometry. The nascent cluster ion distributions, fragmentations, and reactions were studied. The observed patterns of stability and reactivity were compared with the structures and heats of formation calculated from theoretical studies of aluminum oxide cluster ions using MNDO, X-alpha, and Born-Mayer pair potentials. The method of production of the metal oxide cluster ions, whether by FAB, DLV, or through the reaction of sputtered bare metal cluster ions with oxygen, had little influence on the abundance distribution observed. In agreement with the known M-O binding energies, a trend of increasing cluster oxidation state was observed in the abundance distributions of the cluster ions for decreasing metal atom z value. Dissociation of the oxide cluster ions occurred through the loss of particularly stable neutral fragments which together with theoretical considerations suggest a preference for particular parent cluster stoichiometries. Although gallium oxide and indium oxide cluster ions exhibited little reactivity toward oxidation agents, the aluminum oxide ions reacted readily with most oxidants. "Oxygen saturation" effects were observed for the ions with 2 and 3 aluminum atoms. These saturation effects could be explained by the formation of structures in which the Al atoms are three-fold planar coordinated. C1 USN,RES LAB,DIV CHEM,WASHINGTON,DC 20375. OI Dunlap, Brett/0000-0003-1356-6559 NR 58 TC 37 Z9 37 U1 0 U2 14 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 FEB 15 PY 1991 VL 94 IS 4 BP 2578 EP 2587 DI 10.1063/1.459834 PG 10 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA EY070 UT WOS:A1991EY07000026 ER PT J AU NGAI, KL RENDELL, RW PLAZEK, DJ AF NGAI, KL RENDELL, RW PLAZEK, DJ TI COUPLINGS BETWEEN THE COOPERATIVELY REARRANGING REGIONS OF THE ADAM-GIBBS THEORY OF RELAXATIONS IN GLASS-FORMING LIQUIDS SO JOURNAL OF CHEMICAL PHYSICS LA English DT Article ID STRETCHED-EXPONENTIAL RELAXATION; VOGEL-FULCHER BEHAVIOR; DIELECTRIC-RELAXATION; WILLIAMS-WATTS; TRANSITION; GLYCEROL; SPECTROSCOPY; DYNAMICS; HEAT AB The Adam-Gibbs theory of relaxation for glass-forming liquids is based on an ensemble of independent and equivalent cooperatively rearranging regions (CRR's). In this work we extend the Adam-Gibbs theory by incorporating the mutual interactions between the CRR's. This is done by the method of the coupling scheme in which the transition rate for each independent CRR is slowed down by a time-dependent factor. The new combined theory predicts a stretched exponential relaxation function and modifies the Adam-Gibbs parameters for the temperature dependence of the relaxation time making them functions of the stretched exponent beta. The model is applied to analyze specific heat and dielectric data of supercooled liquids. It is able to explain a previously proposed correlation of the increasing fragility of glass forming liquids with the size of 1 - beta at T(g) and the rapidity of the temperature variation of beta. The model also explains, in hydrogen bonded liquids, the correlation of the increasing fragility with the size of the basic molecular unit and/or the number of hydroxyl groups found by comparison of dielectric relaxations of glycerol, n-propanol, butanediol-1,3, and sorbitol. C1 UNIV PITTSBURGH,DEPT MET & MAT ENGN,PITTSBURGH,PA 15213. RP NGAI, KL (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 36 TC 126 Z9 127 U1 1 U2 16 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0021-9606 J9 J CHEM PHYS JI J. Chem. Phys. PD FEB 15 PY 1991 VL 94 IS 4 BP 3018 EP 3029 DI 10.1063/1.459825 PG 12 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA EY070 UT WOS:A1991EY07000073 ER PT J AU BENDER, BA WALLACE, JS SCHRODT, DJ AF BENDER, BA WALLACE, JS SCHRODT, DJ TI EFFECT OF THERMOCHEMICAL TREATMENTS ON THE STRENGTH AND MICROSTRUCTURE OF SIC FIBERS SO JOURNAL OF MATERIALS SCIENCE LA English DT Article ID ORGANOMETALLIC POLYMER PRECURSOR; SILICON-CARBIDE FIBERS; HIGH-TENSILE STRENGTH; STRUCTURAL CHARACTERIZATION; NICALON; STABILITY AB The room-temperature strength of commercially available polymer-derived SiC fibres degrades during the typical high-temperature thermal cycle used in ceramic matrix composite fabrication. Substantial improvements in retained room-temperature strength for two different commercially available fibres were observed after annealing in carbon powder at temperatures up to 1600-degrees-C. Further improvements in strength were observed for both fibres when heat treated in CO atmospheres. X-ray diffraction, TEM, SEM, auger electron spectroscopy, and optical microscopy were used to characterize the microstructure and chemistry of these heat-treated fibres in order to understand better the degradation mechanisms of the fibres as well as their improved strength retention. C1 NATL INST STAND & TECHNOL,GAITHERSBURG,MD 20899. CATALYST RES CORP,BALTIMORE,MD 21201. RP BENDER, BA (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 23 TC 39 Z9 39 U1 1 U2 4 PU CHAPMAN HALL LTD PI LONDON PA 2-6 BOUNDARY ROW, LONDON, ENGLAND SE1 8HN SN 0022-2461 J9 J MATER SCI JI J. Mater. Sci. PD FEB 15 PY 1991 VL 26 IS 4 BP 970 EP 976 PG 7 WC Materials Science, Multidisciplinary SC Materials Science GA EY759 UT WOS:A1991EY75900016 ER PT J AU HANSON, F DICK, D AF HANSON, F DICK, D TI BLUE PARAMETRIC GENERATION FROM TEMPERATURE-TUNED LIB3O5 SO OPTICS LETTERS LA English DT Article ID BARIUM BORATE AB We have demonstrated optical parametric generation from 470 to 487 nm with LiB3O5, using a 355-nm pump in a noncritical phase-matched orientation by temperature tuning. A conversion efficiency of 9% at 480 nm was achieved at room temperature. RP HANSON, F (reprint author), USN,CTR OCEAN SYST,SAN DIEGO,CA 92152, USA. NR 10 TC 25 Z9 25 U1 0 U2 0 PU OPTICAL SOC AMER PI WASHINGTON PA 2010 MASSACHUSETTS AVE NW, WASHINGTON, DC 20036 SN 0146-9592 J9 OPT LETT JI Opt. Lett. PD FEB 15 PY 1991 VL 16 IS 4 BP 205 EP 207 DI 10.1364/OL.16.000205 PG 3 WC Optics SC Optics GA EW374 UT WOS:A1991EW37400005 PM 19773883 ER PT J AU STONEMAN, RC ESTEROWITZ, L AF STONEMAN, RC ESTEROWITZ, L TI CONTINUOUS-WAVE 1.50-MU-M THULIUM CASCADE LASER SO OPTICS LETTERS LA English DT Article ID OPTICAL-SPECTRUM; LIYF4 AB A cascade laser scheme is used to obtain continuous-wave 1.50-mu-m laser emission at room temperature on the normally self-terminating Tm3+ H-3(4) --> 3F4 transition in YLiF4. The long-lived 3F4 state is quenched through energy transfer to the Ho3+ 5I7 state, which is depopulated through the Ho3+ 5I7 --> 5I8 2.06-mu-m laser transition. RP STONEMAN, RC (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 11 TC 31 Z9 31 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 FEB 15 PY 1991 VL 16 IS 4 BP 232 EP 234 DI 10.1364/OL.16.000232 PG 3 WC Optics SC Optics GA EW374 UT WOS:A1991EW37400014 PM 19773892 ER PT J AU NOUNESIS, G GARLAND, CW SHASHIDHAR, R AF NOUNESIS, G GARLAND, CW SHASHIDHAR, R TI CROSSOVER FROM 3-DIMENSIONAL XY TO TRICRITICAL BEHAVIOR FOR THE NEMATIC SMECTIC-A1 PHASE-TRANSITION SO PHYSICAL REVIEW A LA English DT Article ID NONASYMPTOTIC CRITICAL-BEHAVIOR; HEAT-CAPACITY MEASUREMENTS; SPIN-GAS MODEL; LIQUID-CRYSTALS; FIELD-THEORY; A-PHASE; CRITICAL EXPONENTS; POINT; POLYMORPHISM; NEMATIC-SMECTIC-A1 AB A high-resolution ac calorimetric technique has been employed to study the nematic-smectic-A1 (N-Sm-A1) phase transition in liquid-crystal binary mixtures of octyloxyphenyl-nitrobenzoyloxy benzoate (DB8ONO2) and decyloxyphenyl-nitrobenzoyloxy benzoate (DB10ONO2). The existence of a tricritical point on the N-Sm-A1 transition line has been reconfirmed in this study. This tricritical point occurs at mole percent X congruent-to 51 of the decyl homolog in the mixture. Heat-capacity measurements characterizing the N-Sm-A1 transition have been carried out for three samples in the vicinity of the tricritical point (X = 47.0, 48.7, and 50.0) and for one sample with X = 31.5. The results reveal a complete crossover behavior for the critical exponent alpha, which changes from the three-dimensional XY value (alpha-XY = -0.007) for X = 31.5 to a value alpha = 0.422 close to tricritical (alpha-t = 0.50) for x = 50.0. The amplitude ratio A- / A+ for the X = 31.5 sample conforms to that expected from the noninverted XY model. In addition, heat-capacity measurements on one sample with X = 53.7 indicate that near the termination point of the Sm-A(d)-Sm-A1 transition line the phase sequence Sm-A(d)-N(d)-N1-Sm-A1 occurs, in accordance with theoretical predictions. C1 MIT,CTR MAT SCI & ENGN,CAMBRIDGE,MA 02139. USN,RES LAB,BIOMOLEC ENGN,WASHINGTON,DC 20375. RP NOUNESIS, G (reprint author), MIT,DEPT CHEM,CAMBRIDGE,MA 02139, USA. NR 42 TC 36 Z9 36 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 FEB 15 PY 1991 VL 43 IS 4 BP 1849 EP 1856 DI 10.1103/PhysRevA.43.1849 PG 8 WC Optics; Physics, Atomic, Molecular & Chemical SC Optics; Physics GA EX997 UT WOS:A1991EX99700018 ER PT J AU RAJAGOPAL, AK TEITLER, S AF RAJAGOPAL, AK TEITLER, S TI DYNAMIC LINEAR RESPONSE SO PHYSICAL REVIEW A LA English DT Note AB The near-equilibrium nature of dynamic linear response when a system is acted upon by an external force is clarified by using the linearity condition to identify a limited class of near-equilibrium density matrices that characterize the response. The analysis incorporates a distinction between undriven and driven time dependences. Irreversibility is introduced in a traditional way by means of a nonunitary component in the evolution of the undriven dynamics. RP RAJAGOPAL, AK (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 10 TC 2 Z9 2 U1 0 U2 1 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1050-2947 J9 PHYS REV A JI Phys. Rev. A PD FEB 15 PY 1991 VL 43 IS 4 BP 2059 EP 2061 DI 10.1103/PhysRevA.43.2059 PG 3 WC Optics; Physics, Atomic, Molecular & Chemical SC Optics; Physics GA EX997 UT WOS:A1991EX99700042 ER PT J AU RYAN, JC AF RYAN, JC TI COLLECTIVE EXCITATIONS IN A SPIN-POLARIZED QUASI-2-DIMENSIONAL ELECTRON-GAS SO PHYSICAL REVIEW B LA English DT Note ID SPECTRA AB The dispersion relations of the collective modes of an optically created two-dimensional spin-polarized electron plasma, treated as a confined spin-polarized electron gas, are calculated. These exhibit many significant qualitative differences from their spin-unpolarized counterparts, such as emergence of the intrasubband spin wave and splitting of the intersubband spin waves and the longitudinal spin-density oscillations. RP RYAN, JC (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 10 TC 24 Z9 24 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 FEB 15 PY 1991 VL 43 IS 5 BP 4499 EP 4502 DI 10.1103/PhysRevB.43.4499 PG 4 WC Physics, Condensed Matter SC Physics GA EX921 UT WOS:A1991EX92100084 ER PT J AU DUESBERY, MS JOOS, B MICHEL, DJ AF DUESBERY, MS JOOS, B MICHEL, DJ TI DISLOCATION CORE STUDIES IN EMPIRICAL SILICON MODELS SO PHYSICAL REVIEW B LA English DT Note ID NEGATIVE-U SYSTEM; INTERATOMIC POTENTIALS; MOBILITY PROPERTIES; ENERGY-LEVELS; STATES; SEMICONDUCTORS; CRYSTALS; GLIDE; PLASTICITY; SIMULATION AB Several modern empirical potentials for silicon are used to calculate the configurations and energies of dislocation cores and their mobility-related excitations. The degree of consistency with experiment is found to vary systematically with the magnitude of the defect distortion. The results suggest that the distorted structures encountered with this important class of defects should be incorporated into the construction of the potentials. C1 UNIV MARYLAND,DEPT PHYS,COLLEGE PK,MD 20742. USN,RES LAB,WASHINGTON,DC 20375. UNIV OTTAWA,OTTAWA CARLETON INST PHYS,OTTAWA K1N 6N5,ONTARIO,CANADA. RP DUESBERY, MS (reprint author), GEOCENTERS INC,10903 INDIAN HEAD HIGHWAY,FT WASHINGTON,MD 20744, USA. NR 42 TC 60 Z9 60 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 FEB 15 PY 1991 VL 43 IS 6 BP 5143 EP 5146 DI 10.1103/PhysRevB.43.5143 PG 4 WC Physics, Condensed Matter SC Physics GA EY623 UT WOS:A1991EY62300072 ER PT J AU YU, HY KIM, C SANDAY, SC AF YU, HY KIM, C SANDAY, SC TI BUCKLE FORMATION IN VACUUM-DEPOSITED THIN-FILMS SO THIN SOLID FILMS LA English DT Article ID MECHANICAL-PROPERTIES; CARBON-FILMS; STRESS; ADHESION; TEMPERATURE; LAYERS; OXIDE AB A theoretical interpretation of the deformation pattern that develops in vacuum-deposited thin films after being exposed to atmospheric conditions is presented. A ratio between the characteristic dimensions of a unit cross-section of the debonded, buckled film is obtained by minimizing the strain energy of the displacement surface which is approximated by the product of two sinusoidal curves. The calculated ratio for the unit cross-section is in good agreement with experimental measurements. Energetic arguments are then invoked to explain the development of the observed film deformation patterns. C1 USN,RES LAB,WASHINGTON,DC 20375. RP YU, HY (reprint author), GEOCENTERS INC,FT WASHINGTON,MD, USA. NR 18 TC 30 Z9 31 U1 1 U2 2 PU ELSEVIER SCIENCE SA LAUSANNE PI LAUSANNE 1 PA PO BOX 564, 1001 LAUSANNE 1, SWITZERLAND SN 0040-6090 J9 THIN SOLID FILMS JI Thin Solid Films PD FEB 15 PY 1991 VL 196 IS 2 BP 229 EP 233 DI 10.1016/0040-6090(91)90366-6 PG 5 WC Materials Science, Multidisciplinary; Materials Science, Coatings & Films; Physics, Applied; Physics, Condensed Matter SC Materials Science; Physics GA EZ270 UT WOS:A1991EZ27000007 ER PT J AU HANSSEN, LM SNAIL, KA CARRINGTON, WA BUTLER, JE KELLOGG, S OAKES, DB AF HANSSEN, LM SNAIL, KA CARRINGTON, WA BUTLER, JE KELLOGG, S OAKES, DB TI DIAMOND AND NON-DIAMOND CARBON SYNTHESIS IN AN OXYGEN ACETYLENE FLAME SO THIN SOLID FILMS LA English DT Article ID GRAPHITE AB Diamond and non-diamond carbon deposition in an oxygen-acetylene combustion flame has been analyzed over a range of oxidizer:fuel ratios (R(f)) and substrate temperatures (T(s)). The effects on diamond deposition of substrate preparation and position in the oxygen-acetylene flame have been examined. Diagrams relating diamond, microcrystalline graphite and amorphous carbon growth to the oxygen:acetylene flow ratio and substrate temperature have been developed. In addition, the dependences of particle morphology and growth rate on T(s) and R(f) were examined. Micro-Raman spectroscopy, optical microscopy and scanning electron microscopy were used to analyze the growth. C1 USN,RES LAB,DIV OPT SCI,CODE 6522,WASHINGTON,DC 20375. RI Butler, James/B-7965-2008 OI Butler, James/0000-0002-4794-7176 NR 16 TC 55 Z9 56 U1 0 U2 3 PU ELSEVIER SCIENCE SA LAUSANNE PI LAUSANNE 1 PA PO BOX 564, 1001 LAUSANNE 1, SWITZERLAND SN 0040-6090 J9 THIN SOLID FILMS JI Thin Solid Films PD FEB 15 PY 1991 VL 196 IS 2 BP 271 EP 281 DI 10.1016/0040-6090(91)90371-4 PG 11 WC Materials Science, Multidisciplinary; Materials Science, Coatings & Films; Physics, Applied; Physics, Condensed Matter SC Materials Science; Physics GA EZ270 UT WOS:A1991EZ27000012 ER PT J AU SPRANGLE, P HAFIZI, B AF SPRANGLE, P HAFIZI, B TI COMMENT ON NONDIFFRACTING BEAMS SO PHYSICAL REVIEW LETTERS LA English DT Letter ID TRANSMISSION C1 SCI APPLICAT INT CORP,MCLEAN,VA 22102. RP SPRANGLE, P (reprint author), USN,RES LAB,DIV PLASMA PHYS,BEAM PHYS BRANCH,WASHINGTON,DC 20375, USA. NR 8 TC 42 Z9 42 U1 2 U2 9 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 FEB 11 PY 1991 VL 66 IS 6 BP 837 EP 837 DI 10.1103/PhysRevLett.66.837 PG 1 WC Physics, Multidisciplinary SC Physics GA EX923 UT WOS:A1991EX92300041 ER PT J AU KAELIN, WG PALLAS, DC DECAPRIO, JA KAYE, FJ LIVINGSTON, DM AF KAELIN, WG PALLAS, DC DECAPRIO, JA KAYE, FJ LIVINGSTON, DM TI IDENTIFICATION OF CELLULAR PROTEINS THAT CAN INTERACT SPECIFICALLY WITH THE T/E1A-BINDING REGION OF THE RETINOBLASTOMA GENE-PRODUCT SO CELL LA English DT Article ID SV40 LARGE-T; SUSCEPTIBILITY GENE; DNA-BINDING; ADENOVIRUS E1A; RB GENE; SV40-TRANSFORMED CELLS; ENCODED PROTEIN; OSTEO-SARCOMA; 1A PROTEINS; EXPRESSION AB The SV40 T antigen (T)/adenovirus E1A-binding domain of the retinoblastoma gene product (pRB) has been fused to S. japonicum glutathione S-transferase, and the chimera, bound to insoluble glutathione, was used to search for cellular proteins that can interact specifically with pRB. At least seven such proteins were detected in extracts of multiple human tumor cell lines. These proteins failed to bind to a family of pRB fusion proteins that harbor inactivating mutations in the T/E1A-binding domain and to the wild-type fusion protein in the presence of a peptide replica of the pRB-binding domain of T. Therefore, the binding of one or more of these proteins may contribute to the growth-suppressing function of pRB. C1 HARVARD UNIV,SCH MED,BOSTON,MA 02115. NCI,USN,MED ONCOL BRANCH,BETHESDA,MD 20814. UNIFORMED SERV UNIV HLTH SCI,BETHESDA,MD 20814. RP KAELIN, WG (reprint author), HARVARD UNIV,SCH MED,DANA FARBER CANC INST,BOSTON,MA 02115, USA. RI Wang, Nianshuang/C-1463-2010; kaye, frederic/E-2437-2011 FU NCI NIH HHS [R01 CA057327] NR 66 TC 535 Z9 537 U1 1 U2 13 PU CELL PRESS PI CAMBRIDGE PA 1050 MASSACHUSETTES AVE, CIRCULATION DEPT, CAMBRIDGE, MA 02138 SN 0092-8674 J9 CELL JI Cell PD FEB 8 PY 1991 VL 64 IS 3 BP 521 EP 532 DI 10.1016/0092-8674(91)90236-R PG 12 WC Biochemistry & Molecular Biology; Cell Biology SC Biochemistry & Molecular Biology; Cell Biology GA EX361 UT WOS:A1991EX36100008 PM 1825028 ER EF