FN Thomson Reuters Web of Science™ VR 1.0 PT J AU DOYLE, RJ AF DOYLE, RJ TI FORMATION OF NITRIC-ACID BY STRUCTURAL REARRANGEMENTS OF GAS-PHASE IONIC COMPLEXES OF AMMONIUM-NITRATE SO JOURNAL OF THE AMERICAN CHEMICAL SOCIETY LA English DT Article ID CLUSTER IONS; MULTIPHOTON IONIZATION; MOLECULE REACTIONS; SPECTROMETRY; CHEMISTRY; SOLVATION AB A detailed study of nitric acid formation in gas-phase ionic aggregates of ammonium nitrate is reported. Fast-atom bombardment was used to sputter cationic ammonium nitrate complexes from neat ammonium nitrate crystals. The sputtered complexes are of the form (NH4NO3)(n)NH4+ and have been detected in the range of n = 1-43. The formation of nitric acid from gas-phase cationic complexes of ammonium nitrate is shown to occur by a rearrangement of NH4+(NO3-)NH4+, the core ion of the first solvent shell. Metastable and collisional-activation dissociation spectra show that a completed first solvent shell exists when the core ion is solvated by the hydrogen bonding of six NH4NO3 molecules to the six available hydrogen atoms of the two ammonium ions, yielding (NH4NO3)(7)NH4+. The metastable loss of HNO3 occurs only from complexes with less than six ligands; a fully solvated core ion cannot rearrange. Collisional activation of larger complexes (n > 7), under multiple-collision conditions, induces sequential losses of NH4NO3 until an ion with n < 7 (incomplete first solvent shell) is formed, at which point rearrangement may occur and one nitric acid molecule may be lost. RP DOYLE, RJ (reprint author), USN,RES LAB,DIV CHEM,CODE 6110D,WASHINGTON,DC 20375, USA. NR 33 TC 4 Z9 4 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0002-7863 J9 J AM CHEM SOC JI J. Am. Chem. Soc. PD APR 6 PY 1994 VL 116 IS 7 BP 3005 EP 3011 DI 10.1021/ja00086a033 PG 7 WC Chemistry, Multidisciplinary SC Chemistry GA NG378 UT WOS:A1994NG37800033 ER PT J AU GONSALVES, KE CHOW, GM ZHANG, Y BUDNICK, JI XIAO, TD AF GONSALVES, KE CHOW, GM ZHANG, Y BUDNICK, JI XIAO, TD TI IRON NITRIDE BORON-NITRIDE MAGNETIC NANOCOMPOSITE POWDERS SO ADVANCED MATERIALS LA English DT Note C1 USN,RES LAB,CTR BIOMOLEC SCI & ENGN,WASHINGTON,DC 20375. UNIV CONNECTICUT,INST MAT SCI,POLYMER SCI PROGRAM,STORRS,CT 06269. UNIV CONNECTICUT,DEPT PHYS,STORRS,CT 06269. UNIV CONNECTICUT,DEPT CHEM,STORRS,CT 06269. RP GONSALVES, KE (reprint author), UNIV CONNECTICUT,CONNECTICUT ADV TECHNOL CTR PRECIS MFG,STORRS,CT 06269, USA. NR 12 TC 1 Z9 1 U1 0 U2 0 PU VCH PUBLISHERS INC PI DEERFIELD BEACH PA 303 NW 12TH AVE, DEERFIELD BEACH, FL 33442-1788 SN 0935-9648 J9 ADV MATER JI Adv. Mater. PD APR PY 1994 VL 6 IS 4 BP 291 EP 292 DI 10.1002/adma.19940060406 PG 2 WC Chemistry, Multidisciplinary; Chemistry, Physical; Nanoscience & Nanotechnology; Materials Science, Multidisciplinary; Physics, Applied; Physics, Condensed Matter SC Chemistry; Science & Technology - Other Topics; Materials Science; Physics GA NE867 UT WOS:A1994NE86700005 ER PT J AU DECREDICO, MA AF DECREDICO, MA TI AGRICULTURE AND SLAVERY IN MISSOURI LITTLE DIXIE - HURT,RD SO AMERICAN HISTORICAL REVIEW LA English DT Book Review RP DECREDICO, MA (reprint author), USN ACAD,ANNAPOLIS,MD 21402, USA. NR 1 TC 0 Z9 0 U1 0 U2 0 PU AMER HISTORICAL REVIEW PI WASHINGTON PA 400 A ST SE, WASHINGTON, DC 20003 SN 0002-8762 J9 AM HIST REV JI Am. Hist. Rev. PD APR PY 1994 VL 99 IS 2 BP 657 EP 658 DI 10.2307/2167473 PG 2 WC History SC History GA NJ047 UT WOS:A1994NJ04700216 ER PT J AU DENARDO, B ALKOV, S AF DENARDO, B ALKOV, S TI ACOUSTIC RESONATORS WITH VARIABLE NONUNIFORMITY SO AMERICAN JOURNAL OF PHYSICS LA English DT Article AB In a novel set of acoustic resonators, alterations of the nonuniformity in cross-sectional area are utilized to change the resonance frequency. Each resonator is designed to yield two, three, or four frequencies whose differences correspond to musical intervals. The apparatus have a simple piecewise-uniform geometry that can easily be changed, and are useful as educational demonstrations of an effect of nonuniformity on waves. The shifts in frequency can be accurately calculated by imposing boundary conditions on solutions of the wave equation in the uniform regions. The phenomenon can be physically understood with the energy method of Rayleigh, or more generally with the method of adiabatic invariance. The latter methods yield the shift in resonance frequency for arbitrary but small nonuniformity. C1 USN,POSTGRAD SCH,DEPT PHYS,MONTEREY,CA 93943. NR 20 TC 6 Z9 6 U1 0 U2 1 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0002-9505 J9 AM J PHYS JI Am. J. Phys. PD APR PY 1994 VL 62 IS 4 BP 315 EP 321 DI 10.1119/1.17573 PG 7 WC Education, Scientific Disciplines; Physics, Multidisciplinary SC Education & Educational Research; Physics GA NE870 UT WOS:A1994NE87000010 ER PT J AU SWENSON, JD HAAS, G HULLANDER, RM AF SWENSON, JD HAAS, G HULLANDER, RM TI ATRIAL SEPTAL ANEURYSM DIAGNOSED DURING CORONARY-ARTERY BYPASS-SURGERY SO ANESTHESIA AND ANALGESIA LA English DT Note C1 USN,MED CTR,DEPT CLIN INVEST,SAN DIEGO,CA 92134. USN,MED CTR,DEPT ANESTHESIOL,SAN DIEGO,CA 92134. NR 8 TC 2 Z9 2 U1 0 U2 0 PU WILLIAMS & WILKINS PI BALTIMORE PA 351 WEST CAMDEN ST, BALTIMORE, MD 21201-2436 SN 0003-2999 J9 ANESTH ANALG JI Anesth. Analg. PD APR PY 1994 VL 78 IS 4 BP 798 EP 800 PG 3 WC Anesthesiology SC Anesthesiology GA ND582 UT WOS:A1994ND58200034 PM 8135405 ER PT J AU DUTTON, RP ECKHARDT, WF SUNDER, N AF DUTTON, RP ECKHARDT, WF SUNDER, N TI TOTAL SPINAL-ANESTHESIA AFTER INTERSCALENE BLOCKADE OF THE BRACHIAL-PLEXUS SO ANESTHESIOLOGY LA English DT Note DE ANESTHESIA, REGIONAL, INTERSCALENE; COMPLICATIONS, TOTAL SPINAL ANESTHESIA ID TOXICITY C1 UNIFORMED SERV UNIV HLTH SCI,BETHESDA,MD 20814. HARVARD UNIV,SCH MED,BOSTON,MA. MASSACHUSETTS GEN HOSP,BOSTON,MA 02114. RP DUTTON, RP (reprint author), USN,NATL MED CTR,DEPT ANESTHESIOL,BETHESDA,MD 20889, USA. NR 15 TC 32 Z9 33 U1 0 U2 0 PU LIPPINCOTT-RAVEN PUBL PI PHILADELPHIA PA 227 EAST WASHINGTON SQ, PHILADELPHIA, PA 19106 SN 0003-3022 J9 ANESTHESIOLOGY JI Anesthesiology PD APR PY 1994 VL 80 IS 4 BP 939 EP 941 DI 10.1097/00000542-199404000-00028 PG 3 WC Anesthesiology SC Anesthesiology GA NG521 UT WOS:A1994NG52100028 PM 8024148 ER PT J AU LENNON, P AF LENNON, P TI AN ALTERNATIVE TO ONE-LUNG VENTILATION IN A PATIENT WITH A TRACHEOSTOMY - REPLY SO ANESTHESIOLOGY LA English DT Letter RP LENNON, P (reprint author), USN,NATL MED CTR,DEPT ANESTHESIA,BETHESDA,MD 20889, USA. NR 2 TC 0 Z9 0 U1 0 U2 1 PU LIPPINCOTT-RAVEN PUBL PI PHILADELPHIA PA 227 EAST WASHINGTON SQ, PHILADELPHIA, PA 19106 SN 0003-3022 J9 ANESTHESIOLOGY JI Anesthesiology PD APR PY 1994 VL 80 IS 4 BP 959 EP 959 DI 10.1097/00000542-199404000-00037 PG 1 WC Anesthesiology SC Anesthesiology GA NG521 UT WOS:A1994NG52100036 ER PT J AU MAISACK, M WOOD, KS GRUBER, DE AF MAISACK, M WOOD, KS GRUBER, DE TI AGN EMISSION ABOVE 20 KEV - THE HARD X-RAY-DETECTION PROBLEM SO ASTRONOMY & ASTROPHYSICS LA English DT Article DE GALAXIES, ACTIVE; X-RAYS, GALAXIES; GAMMA-RAY, OBSERVATIONS ID ACTIVE GALACTIC NUCLEI; GALAXIES; CATALOG; SPECTRA; QUASARS AB We have searched the HEAO-4 LED all-sky survey database (13-180 keV) for a class of AGN that is most likely to emit X-rays at energies of almost-equal-to 50 keV and above, as a basis for further studies with the Compton Gamma Ray Observatory (CGRO). We have overlayed the survey signals of several samples of AGN - quasars, BL Lacs and Seyfert galaxies - with individual source flux below a significance of 3sigma. The objects were selected by their prominence and properties at other wavelengths, and in Einstein observations and the HEAO-A1 survey. We find no significant signal at hard X-rays from any of the chosen classes of radio- loud QSOs and BL Lacs. We find a signal from Seyfert 1 galaxies up to 80 keV compatible with the canonical energy index alpha = 0.7. C1 UNIV CALIF SAN DIEGO, CTR ASTROPHYS & SPACE SCI, LA JOLLA, CA 92093 USA. USN, RES LAB, EO HULBURT CTR SPACE RES, WASHINGTON, DC 20375 USA. RP MAISACK, M (reprint author), UNIV TUBINGEN, INST ASTRON, D-72076 TUBINGEN, GERMANY. NR 29 TC 8 Z9 8 U1 0 U2 0 PU EDP SCIENCES S A PI LES ULIS CEDEX A PA 17, AVE DU HOGGAR, PA COURTABOEUF, BP 112, F-91944 LES ULIS CEDEX A, FRANCE SN 0004-6361 J9 ASTRON ASTROPHYS JI Astron. Astrophys. PD APR PY 1994 VL 284 IS 1 BP 28 EP 32 PG 5 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA ND829 UT WOS:A1994ND82900010 ER PT J AU STURNER, SJ DERMER, CD AF STURNER, SJ DERMER, CD TI ENERGY-DEPENDENT EFFECTS OF SCATTERING ATMOSPHERES ON X-RAY PULSAR PULSE PROFILES SO ASTRONOMY & ASTROPHYSICS LA English DT Article DE PULSARS, GENERAL; STARS, NEUTRON; BINARIES, CLOSE; X-RAYS, STARS ID STRONGLY MAGNETIZED PLASMA; NEUTRON STARS; COMPTON-SCATTERING; RADIATIVE-TRANSFER; CONTINUUM SPECTRA; ACCRETION; DISCOVERY; FIELDS; MODELS; LUMINOSITY AB We propose that radiation-supported scattering atmospheres near accreting X-ray pulsars can explain energy-dependent features observed in the pulse profiles of 4U 1626-67, 4U 1538-52,4U 1907+09 and Vela X-1. These atmospheres provide a physical model for the phenomenological annular emitting regions employed by Leahy to fit X-ray pulsar pulse profiles. We examine the effects of the scattering atmospheres under the assumption that stable, optically thick atmospheres exist in a region where the optically thin resonant radiation force exceeds the force of gravity on ionized hydrogen. We predict that less complex pulse profiles will be observed at higher photon energies because the scattering atmospheres, which are supported by resonant Compton radiation pressure, become transparent to photons with energies greater than the cyclotron energy at the neutron star surface. C1 RICE UNIV, DEPT SPACE PHYS & ASTRON, HOUSTON, TX 77251 USA. RP STURNER, SJ (reprint author), USN, RES LAB, EO HULBURT CTR SPACE RES, CODE 7653, WASHINGTON, DC 20375 USA. NR 39 TC 18 Z9 18 U1 0 U2 0 PU EDP SCIENCES S A PI LES ULIS CEDEX A PA 17, AVE DU HOGGAR, PA COURTABOEUF, BP 112, F-91944 LES ULIS CEDEX A, FRANCE SN 0004-6361 J9 ASTRON ASTROPHYS JI Astron. Astrophys. PD APR PY 1994 VL 284 IS 1 BP 161 EP 173 PG 13 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA ND829 UT WOS:A1994ND82900025 ER PT J AU OTT, M WITZEL, A QUIRRENBACH, A KRICHBAUM, TP STANDKE, KJ SCHALINSKI, CJ HUMMEL, CA AF OTT, M WITZEL, A QUIRRENBACH, A KRICHBAUM, TP STANDKE, KJ SCHALINSKI, CJ HUMMEL, CA TI AN UPDATED LIST OF RADIO FLUX-DENSITY CALIBRATORS SO ASTRONOMY & ASTROPHYSICS LA English DT Article DE OBSERVATIONAL METHODS; RADIO CONTINUUM, GENERAL ID SCALE; WAVELENGTH; TELESCOPE; SPECTRUM; LINES; MAPS AB We present new flux densities in the range 0.7 cm less-than-or-equal-to lambda less-than-or-equal-to 21 cm for the radio sources in the calibrator list of Baars et al. (1977). Most of these sources show significant variability on the time scale of a decade, with the notable exception of 3C286 and 3C295. We use these sources to link our relative measurements to the absolute scale of Baars et al.; for the other sources we present updated spectra. We assess the suitability of the individual sources for use as flux density calibrators. C1 USN OBSERV, NRL, OPT INTERFEROMETER PROJECT, WASHINGTON, DC 20392 USA. DOMAINE UNIV, INST RADIOASTRON MILLIMETR, F-38406 ST MARTIN DHERES, FRANCE. RP MAX PLANCK INST RADIOASTRON, AUF DEM HUGEL 69, D-53121 BONN, GERMANY. NR 32 TC 270 Z9 276 U1 2 U2 2 PU EDP SCIENCES S A PI LES ULIS CEDEX A PA 17, AVE DU HOGGAR, PA COURTABOEUF, BP 112, F-91944 LES ULIS CEDEX A, FRANCE SN 1432-0746 J9 ASTRON ASTROPHYS JI Astron. Astrophys. PD APR PY 1994 VL 284 IS 1 BP 331 EP 339 PG 9 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA ND829 UT WOS:A1994ND82900045 ER PT J AU HOPKINS, EW AF HOPKINS, EW TI STROKE IN THE YOUNG AVIATOR SO AVIATION SPACE AND ENVIRONMENTAL MEDICINE LA English DT Article AB A robustly healthy aviator experienced a sudden focal impairment in cerebral function from which he rapidly recovered in a manner consistent with the entity known as ''spectacular shrinking deficit syndrome.'' Although brain imaging studies revealed a ''lacunar'' type lesion involving the caudate nucleus, the clinical picture wets much more suggestive of a cardiogenic embolic event. Transthoracic echocardiography was required to demonstrate the probable cause of the stroke (an atrial septal defect). Following surgical repair of the atrial septal defect, the aviator was recommended for waiver to resume duties involving aviation as pilot in command. RP HOPKINS, EW (reprint author), USN,NAVAL AEROSP & OPERAT MED INST,MC,DEPT NEUROL,NAVAL AIR STN,CODE 24,220 HOVEY RD,PENSACOLA,FL, USA. NR 5 TC 2 Z9 4 U1 0 U2 0 PU AEROSPACE MEDICAL ASSOC PI ALEXANDRIA PA 320 S HENRY ST, ALEXANDRIA, VA 22314-3579 SN 0095-6562 J9 AVIAT SPACE ENVIR MD JI Aviat. Space Environ. Med. PD APR PY 1994 VL 65 IS 4 BP 367 EP 368 PG 2 WC Public, Environmental & Occupational Health; Medicine, General & Internal; Sport Sciences SC Public, Environmental & Occupational Health; General & Internal Medicine; Sport Sciences GA NE707 UT WOS:A1994NE70700016 PM 8002922 ER PT J AU WEBER, J SALGALLER, M SAMID, D JOHNSON, B HERLYN, M LASSAM, N TREISMAN, J ROSENBERG, SA AF WEBER, J SALGALLER, M SAMID, D JOHNSON, B HERLYN, M LASSAM, N TREISMAN, J ROSENBERG, SA TI EXPRESSION OF THE MAGE-1 TUMOR-ANTIGEN IS UP-REGULATED BY THE DEMETHYLATING AGENT 5-AZA-2'-DEOXYCYTIDINE SO CANCER RESEARCH LA English DT Article ID TOXIC LYMPHOCYTES-T; HUMAN GENE MAGE-1; INFILTRATING LYMPHOCYTES; HUMAN-MELANOMA; DNA METHYLATION; CELL CLONES; RECOMBINANT INTERLEUKIN-2; ADOPTIVE IMMUNOTHERAPY; PROLIFERATE INVIVO; REJECTION ANTIGEN AB MAGE-1 is a gene that encodes an antigen on a melanoma cell line that is recognized by cytolytic T-cells. We have used a reverse transcription-polymerase chain reaction assay to analyze expression of the MAGE-1 gene by cell lines from different types of tumors, melanomas from different stages of disease progression, normal diploid cell lines, and melanocyte and nevus tissue from which malignant melanomas are derived. MAGE-1 is expressed by melanoma tissue from all stages of disease, but not melanocytes, nevus tissue, or any normal diploid cell line tested. A fraction of tumor lines derived from various epithelial and neuroectodermal malignancies expressed MAGE-1 but not peripheral blood cells from patients with melanoma. 5-Aza-2'-deoxycytidine (DAC), a demethylating agent, was capable of inducing MAGE-1 expression by a MAGE-1-negative melanoma cell line 888-mel as well as by a number of other melanoma cell lines. At an optimum concentration of 1 muM DAC, MAGE-1 expression was detectable by 24 h, plateaued by 72 h, but remained high for two weeks after removal of DAC from treated 888-mel cells, consistent with induction by demethylation. With the exception of tumor-infiltrating leukocytes, no normal diploid cell line could be induced with DAC to up-regulate MAGE-1 expression. DAC-treated 888-mel cells were lysed by a MAGE-1-specific major histocompatibility complex restricted cytolytic T-cell clone, whereas control untreated cells were not, suggesting that production of the antigen encoded by the MAGE-1 gene was induced by DAC and that it was presented in association with major histocompatibility complex class I molecules at the cell surface for T-cell recognition. C1 NCI,CLIN PHARMACOL BRANCH,BETHESDA,MD 20892. NCI,USN MED ONCOL BRANCH,BETHESDA,MD 20892. WISTAR INST ANAT & BIOL,PHILADELPHIA,PA 19104. TORONTO BAYVIEW HOSP,TORONTO,ON,CANADA. RP WEBER, J (reprint author), NCI,SURG BRANCH,9000 ROCKVILLE PIKE,BLDG 10,ROOM 2B42,BETHESDA,MD 20892, USA. NR 48 TC 205 Z9 210 U1 0 U2 4 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 1994 VL 54 IS 7 BP 1766 EP 1771 PG 6 WC Oncology SC Oncology GA ND238 UT WOS:A1994ND23800030 PM 7511051 ER PT J AU CAMEROTA, AJ RASH, FG AF CAMEROTA, AJ RASH, FG TI EXTERNAL HYDROCEPHALUS IN A SET OF TRIPLETS SO CLINICAL PEDIATRICS LA English DT Note AB External hydrocephalus appears to be a benign form of infantile macrocephaly which typically resolves in the second year of life. Macrocephaly may persist into adulthood and is closely associated with benign familial macrocephaly.(1) The CT findings include a prominent and widened interhemispheric fissure, enlargement of the subarachnoid space over the frontal convexities, and prominent basal cisternae.(2) Although obstruction of the arachnoid villae has been proposed, the etiology of the accumulation of this extra-axial fluid is unknown.(3) The following case study of dizygotic triplets with idiopathic external hydrocephalus highlights the hereditary basis of the condition. RP CAMEROTA, AJ (reprint author), USN HOSP,DEPT PEDIAT,DIV PEDIAT NEUROL,SAN DIEGO,CA 92134, USA. NR 6 TC 1 Z9 1 U1 0 U2 0 PU WESTMINSTER PUBL INC PI GLEN HEAD PA 708 GLEN COVE AVE, GLEN HEAD, NY 11545 SN 0009-9228 J9 CLIN PEDIATR JI Clin. Pediatr. PD APR PY 1994 VL 33 IS 4 BP 255 EP 256 DI 10.1177/000992289403300416 PG 2 WC Pediatrics SC Pediatrics GA NG040 UT WOS:A1994NG04000016 PM 8013179 ER PT J AU HARLAN, DM HENGARTNER, H HUANG, ML KANG, YH ABE, R MOREADITH, RW PIRCHER, H OHASHI, PS FREEMAN, GJ NADLER, LM JUNE, CH AICHELE, P AF HARLAN, DM HENGARTNER, H HUANG, ML KANG, YH ABE, R MOREADITH, RW PIRCHER, H OHASHI, PS FREEMAN, GJ NADLER, LM JUNE, CH AICHELE, P TI TRANSGENIC MICE EXPRESSING B7-1 ON PANCREATIC BETA-CELLS EXHIBIT DIABETES SUSCEPTIBILITY DUE TO A BREAKDOWN OF T-LYMPHOCYTE UNRESPONSIVENESS SO CLINICAL RESEARCH LA English DT Meeting Abstract C1 USN,MED RES INST,IMMUNE CELL BIOL PROGRAM,BETHESDA,MD 20814. UNIV ZURICH,INST EXPTL IMMUNOL,CH-8006 ZURICH,SWITZERLAND. UNIV TEXAS,SW MED CTR,MOLEC CARDIOL LAB,DALLAS,TX 75230. UNIV TORONTO,ONTARIO CANC INST,TORONTO M5S 1A1,ONTARIO,CANADA. HARVARD UNIV,SCH MED,DANA FARBER CANC INST,BOSTON,MA 02115. NR 0 TC 0 Z9 0 U1 0 U2 0 PU SLACK INC PI THOROFARE PA 6900 GROVE RD, THOROFARE, NJ 08086 SN 0009-9279 J9 CLIN RES JI Clin. Res. PD APR PY 1994 VL 42 IS 2 BP A343 EP A343 PG 1 WC Medicine, Research & Experimental SC Research & Experimental Medicine GA NF020 UT WOS:A1994NF02001315 ER PT J AU NUSSLER, AK MELLOUK, S HOFFMAN, SL LIU, ZZ DELAVEGA, P BILLIAR, TR AF NUSSLER, AK MELLOUK, S HOFFMAN, SL LIU, ZZ DELAVEGA, P BILLIAR, TR TI SPONTANEOUS AND IFN-GAMMA-INDUCED INHIBITION OF PLASMODIUM LIVER STAGE DEVELOPMENT IS ENHANCED BY TETRAHYDROBIOPTERIN SO CLINICAL RESEARCH LA English DT Meeting Abstract C1 USN,MED RES INST,MALARIA PROGRAM,BETHESDA,MD 20814. UNIV PITTSBURGH,DEPT SURG,PITTSBURGH,PA 15260. UNIV MARYLAND,DEPT MICROBIOL & IMMUNOL,BALTIMORE,MD 21201. NR 0 TC 0 Z9 0 U1 0 U2 1 PU SLACK INC PI THOROFARE PA 6900 GROVE RD, THOROFARE, NJ 08086 SN 0009-9279 J9 CLIN RES JI Clin. Res. PD APR PY 1994 VL 42 IS 2 BP A283 EP A283 PG 1 WC Medicine, Research & Experimental SC Research & Experimental Medicine GA NF020 UT WOS:A1994NF02000977 ER PT J AU SEDEGAH, M HEDSTROM, R HOFFMAN, SL AF SEDEGAH, M HEDSTROM, R HOFFMAN, SL TI PROTECTION AGAINST MALARIA BY IMMUNIZATION WITH CIRCUMSPOROZOITE PROTEIN PLASMID DNA SO CLINICAL RESEARCH LA English DT Meeting Abstract C1 USN,MED RES INST,MALARIA PROGRAM,BETHESDA,MD 20814. NR 0 TC 1 Z9 1 U1 0 U2 1 PU SLACK INC PI THOROFARE PA 6900 GROVE RD, THOROFARE, NJ 08086 SN 0009-9279 J9 CLIN RES JI Clin. Res. PD APR PY 1994 VL 42 IS 2 BP A282 EP A282 PG 1 WC Medicine, Research & Experimental SC Research & Experimental Medicine GA NF020 UT WOS:A1994NF02000973 ER PT J AU TWITTY, SA RAPP, UR SIEGEL, JN AF TWITTY, SA RAPP, UR SIEGEL, JN TI C-RAF MEDIATES ACTIVATION OF MULTIPLE PROMOTER ELEMENTS IN IL-2 GENE-TRANSCRIPTION SO CLINICAL RESEARCH LA English DT Meeting Abstract C1 USN,MED RES INST,IMMUNE CELL BIOL PROGRAM,BETHESDA,MD 20814. NR 0 TC 0 Z9 0 U1 0 U2 0 PU SLACK INC PI THOROFARE PA 6900 GROVE RD, THOROFARE, NJ 08086 SN 0009-9279 J9 CLIN RES JI Clin. Res. PD APR PY 1994 VL 42 IS 2 BP A205 EP A205 PG 1 WC Medicine, Research & Experimental SC Research & Experimental Medicine GA NF020 UT WOS:A1994NF02000532 ER PT J AU UEDA, Y FREEMAN, G LEVINE, B WARD, SG HUANG, ML ABE, R NADLER, LM JUNE, CH AF UEDA, Y FREEMAN, G LEVINE, B WARD, SG HUANG, ML ABE, R NADLER, LM JUNE, CH TI DISTINCT MECHANISMS OF T-CELL SIGNAL-TRANSDUCTION BY CD28 AND CTLA4, AND BY LIGANDS B7-1 AND B7-2 SO CLINICAL RESEARCH LA English DT Meeting Abstract C1 USN,MED RES INST,IMMUNE CELL BIOL PROGRAM,BETHESDA,MD 20814. UNIV BATH,DEPT PHARMACOL,BATH BA2 7AY,AVON,ENGLAND. HARVARD UNIV,SCH MED,DANA FARBER CANC INST,DIV TUMOR IMMUNOL,BOSTON,MA 02115. NR 0 TC 0 Z9 0 U1 0 U2 0 PU SLACK INC PI THOROFARE PA 6900 GROVE RD, THOROFARE, NJ 08086 SN 0009-9279 J9 CLIN RES JI Clin. Res. PD APR PY 1994 VL 42 IS 2 BP A309 EP A309 PG 1 WC Medicine, Research & Experimental SC Research & Experimental Medicine GA NF020 UT WOS:A1994NF02001122 ER PT J AU UEDA, Y LEVINE, B VANDENBERGHE, P LEE, KP HUANG, ML JUNE, CH ABE, R AF UEDA, Y LEVINE, B VANDENBERGHE, P LEE, KP HUANG, ML JUNE, CH ABE, R TI DISTINCT SIGNAL-TRANSDUCTION IN MOUSE CD4+ AND CD8+ SPLENIC T-CELLS AFTER CD28 RECEPTOR LIGATION SO CLINICAL RESEARCH LA English DT Meeting Abstract C1 USN,MED RES INST,IMMUNE CELL BIOL PROGRAM,BETHESDA,MD 20814. NR 0 TC 0 Z9 0 U1 0 U2 0 PU SLACK INC PI THOROFARE PA 6900 GROVE RD, THOROFARE, NJ 08086 SN 0009-9279 J9 CLIN RES JI Clin. Res. PD APR PY 1994 VL 42 IS 2 BP A309 EP A309 PG 1 WC Medicine, Research & Experimental SC Research & Experimental Medicine GA NF020 UT WOS:A1994NF02001121 ER PT J AU XU, LC DONAHUE, RC KLUEPFELSTAHL, S BYRNE, E AGRICOLA, B KESSLER, S DUNBAR, C CLINE, A BRADY, RO NIENHUIS, AW KARLSSON, S AF XU, LC DONAHUE, RC KLUEPFELSTAHL, S BYRNE, E AGRICOLA, B KESSLER, S DUNBAR, C CLINE, A BRADY, RO NIENHUIS, AW KARLSSON, S TI RETROVIRAL SUPERNATANT TRANSDUCTION RESULTS IN LONG-TERM LEUKOCYTE MARKING OF RHESUS-MONKEYS WITH THE HUMAN GLUCOCEREBROSIDASE GENE SO CLINICAL RESEARCH LA English DT Meeting Abstract C1 NINCDS,BETHESDA,MD 20892. NHLBI,SURG ONCOL BRANCH,BETHESDA,MD 20892. USN,MED RES INST,IMMUNE CELL BIOL PROGRAM,BETHESDA,MD 20892. NR 1 TC 0 Z9 0 U1 0 U2 0 PU SLACK INC PI THOROFARE PA 6900 GROVE RD, THOROFARE, NJ 08086 SN 0009-9279 J9 CLIN RES JI Clin. Res. PD APR PY 1994 VL 42 IS 2 BP A237 EP A237 PG 1 WC Medicine, Research & Experimental SC Research & Experimental Medicine GA NF020 UT WOS:A1994NF02000713 ER PT J AU MACEDONIA, MR BRUTZMAN, DP AF MACEDONIA, MR BRUTZMAN, DP TI MBONE PROVIDES AUDIO AND VIDEO ACROSS THE INTERNET SO COMPUTER LA English DT Article RP MACEDONIA, MR (reprint author), USN,POSTGRAD SCH,WASHINGTON,DC 20350, USA. NR 8 TC 18 Z9 18 U1 0 U2 0 PU IEEE COMPUTER SOC PI LOS ALAMITOS PA 10662 LOS VAQUEROS CIRCLE, PO BOX 3014, LOS ALAMITOS, CA 90720-1264 SN 0018-9162 J9 COMPUTER JI Computer PD APR PY 1994 VL 27 IS 4 BP 30 EP 36 DI 10.1109/2.274996 PG 7 WC Computer Science, Hardware & Architecture; Computer Science, Software Engineering SC Computer Science GA NG025 UT WOS:A1994NG02500010 ER PT J AU LILL, JV AF LILL, JV TI THE INTEGRATION OF MOLECULAR-DYNAMICS SIMULATIONS WITH IMPOSED TEMPERATURE AND STRESS SO COMPUTER PHYSICS COMMUNICATIONS LA English DT Article ID STATISTICAL ENSEMBLES; ANISOTROPIC SOLIDS; CANONICAL ENSEMBLE; TRANSITIONS; SYSTEMS AB Nonlinear molecular dynamics equations for the simulation of crystals under the conditions of imposed temperature and tensorial pressure are summarized. The physical effects included in these equations, but absent from previous linear and nonlinear theories, is the elastic response of the material being modeled. This physical effect is expressed through satisfaction of the nonlinear tensorial virial theorem. We transform these equations in Hamiltonian form to an equivalent set of Lagrangian equations, and present an algorithm for their numerical integration. The method uses a combination of Verlet and leap-frog algorithms to integrate the atomic positions and velocities as scaled by dynamical lattice vectors of the crystal, the elements of deformation gradient and its velocity, and the Nose-Hoover time scale and generalized friction. A consistent error analysis is performed for the combined integration of each degree of freedom. A symmetrization procedure to eliminate rigid rotations of the crystal is introduce-d. Molecular dynamics simulations of a Martensitic transformation are presented that demonstrate the validity of the nonlinear tensorial virial theorem throughout the transformation; complementary Metropolis Monte Carlo simulations verify that the correct distribution is sampled. RP LILL, JV (reprint author), USN,RES LAB,COMPLEX SYST THEORY BRANCH,CODE 6692,WASHINGTON,DC 20375, USA. NR 25 TC 1 Z9 1 U1 0 U2 4 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 1994 VL 79 IS 2 BP 219 EP 248 DI 10.1016/0010-4655(94)90070-1 PG 30 WC Computer Science, Interdisciplinary Applications; Physics, Mathematical SC Computer Science; Physics GA NK036 UT WOS:A1994NK03600007 ER PT J AU FREITAS, JA DOVERSPIKE, K KLEIN, PB KHONG, YL COLLINS, AT AF FREITAS, JA DOVERSPIKE, K KLEIN, PB KHONG, YL COLLINS, AT TI LUMINESCENCE STUDIES OF NITROGEN-DOPED AND BORON-DOPED DIAMOND FILMS SO DIAMOND AND RELATED MATERIALS LA English DT Article; Proceedings Paper CT 4th European Conference on Diamond, Diamond-like and Related Materials (Diamond Films 93) CY SEP 20-24, 1993 CL ALBUFEIRA, PORTUGAL SP AEA TECHNOL, SURF TECHNOL, HARWELL LAB, ASTEX, COMMISS EUROPEAN COMMUNITIES, DG TEER COATING SERV LTD, DIAMOND & RELATED MAT, DRUKKER INT BV, GENASYSTEMS INC, KOBE STEEL USA INC, ELECTR MAT CTR, NORTON DIAMOND FILM, RENISHHAW TRANSDUCER SYST LTD, US DEPT DEF ID CATHODOLUMINESCENCE; PHOTOLUMINESCENCE; FLAME AB Low temperature cathodoluminescence and photoluminescence measurements have been used to study radiative recombination processes in chemical vapor-deposited flame-grown diamond films that were nominally undoped, nitrogen- or boron-doped, and nitrogen + boron codoped. The crystalline qualities of the films were evaluated using the ratios of the intensities of the first-order Raman phonons of diamond and amorphous carbon as figures of merit. Steady state and time-resolved photoluminescence measurements performed for samples simultaneously doped with nitrogen and boron revealed a broad red emission band, with a maximum at 1.95 eV that appears to be nitrogen related. C1 UNIV LONDON KINGS COLL,WHEATSTONE PHYS LAB,LONDON WC2R 2LS,ENGLAND. SACHS FREEMAN ASSOCIATES LTD,LANDOVER,MD 20785. RP FREITAS, JA (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 12 TC 16 Z9 16 U1 0 U2 4 PU ELSEVIER SCIENCE SA LAUSANNE PI LAUSANNE 1 PA PO BOX 564, 1001 LAUSANNE 1, SWITZERLAND SN 0925-9635 J9 DIAM RELAT MATER JI Diam. Relat. Mat. PD APR PY 1994 VL 3 IS 4-6 BP 821 EP 824 DI 10.1016/0925-9635(94)90277-1 PG 4 WC Materials Science, Multidisciplinary SC Materials Science GA NN160 UT WOS:A1994NN16000104 ER PT J AU VONDUVILLARD, SP HAGAN, RD AF VONDUVILLARD, SP HAGAN, RD TI INDEPENDENCE OF VENTILATION AND BLOOD LACTATE RESPONSES DURING GRADED-EXERCISE SO EUROPEAN JOURNAL OF APPLIED PHYSIOLOGY AND OCCUPATIONAL PHYSIOLOGY LA English DT Article DE VENTILATION; BLOOD LACTATE; POWER OUTPUT INCREMENTS ID ANAEROBIC THRESHOLD; INCREMENTAL EXERCISE; PROGRESSIVE EXERCISE; GAS-EXCHANGE; ACCUMULATION; MUSCLE; WORK; PROTOCOLS; INCREASE; RELEASE AB The effect of power output increment, based on an increase in pedal rate, on blood lactate accumulation during graded exercise is unknown. Therefore, in the present study, we examined the effect of two different rates of power output increments employing two pedal rates on pulmonary ventilation and blood lactate responses during graded cycle ergometry in young men. Males (n=8) with an mean (SD) peak oxygen uptake of 4.2 (0.1) l.min(-1) served as subjects. Each subject performed two graded cycle ergometer tests. The first test, conducted at 60 rev.min(-1), employed 4 min of unloaded pedaling followed by a standard power output step increment (SI) of 60 W every 3rd min. The second test, conducted at 90 rev.min(-1), employed 4 min of unloaded pedaling followed by a high power output step increment (HI) of 90 W every 3rd min. Venous blood was sampled from a forearm vein after 5 min of seated rest, 4 min of unloaded pedaling, and every 3rd min of graded exercise. Peak exercise values for heart rate, oxygen uptake (VO2), and ventilation (V-E) were similar (P>0.05) for SI and HI exercise, as was the relationship between T-E and VO2,, and between V-E and carbon dioxide production (VCO2). However, the relationship between blood lactate concentration and VO2 was dissimilar between SI and HI exercise with blood lactate accumulation beyond the lowest ventilatory equivalent of oxygen, and peak exercise blood lactate concentration values significantly higher (P<0.05) for SI [12.8 (2.6) mmol.l(-1)] compared to HI [8.0 (1.9) mmol.l(-1)] exercise. Our findings demonstrate that blood lactate accumulation and V-E during graded exercise are dissociated. Blood lactate accumulation is influenced by the rate of external power output increment, while V-E is related to VO2 and VCO2. C1 UNIV ILLINOIS,COLL KINESIOL,DEPT EXERCISE PHYSIOL,CHICAGO,IL 60608. USN,HLTH RES CTR,SAN DIEGO,CA 92186. NR 28 TC 6 Z9 6 U1 1 U2 3 PU SPRINGER VERLAG PI NEW YORK PA 175 FIFTH AVE, NEW YORK, NY 10010 SN 0301-5548 J9 EUR J APPL PHYSIOL O JI Eur. J. Appl. Physiol. Occup. Physiol. PD APR PY 1994 VL 68 IS 4 BP 298 EP 302 PG 5 WC Physiology; Sport Sciences SC Physiology; Sport Sciences GA NK872 UT WOS:A1994NK87200004 PM 8055886 ER PT J AU LATENDRESSE, JR BROOKS, CL FLEMMING, CD CAPEN, CC AF LATENDRESSE, JR BROOKS, CL FLEMMING, CD CAPEN, CC TI REPRODUCTIVE TOXICITY OF BUTYLATED TRIPHENYL PHOSPHATE AND TRICRESYL PHOSPHATE FLUIDS IN F344 RATS SO FUNDAMENTAL AND APPLIED TOXICOLOGY LA English DT Article ID ORTHO-CRESYL PHOSPHATE; TESTICULAR TOXICITY; SERTOLI AB The effects of tricresyl phosphate (TCP) and butylated triphenyl phosphate (BTP)-based hydraulic fluid on reproduction were studied in F344 rats using a modification of the National Toxicology Program's Continuous Breeding Protocol. Groups of breeding pairs received single daily oral doses of an equal volume of either 0, 0.6, 1.0 g BTP/kg or 0.4 g TCP/kg in sesame oil or 1.7 g neat BTP/kg for up to 135 days. A naive control group allowed to breed, but not dosed or handled daily, demonstrated that daily dosing and handling of the rats had no effect on reproduction. The fertility index and number of litters born were significantly decreased in rats exposed to 1.0 and 1.7 g BTP/kg and 0.4 g TCP/kg. The number of pups per litter was significantly decreased in the TCP group. A crossover mating experiment using 0.4 g TCP/kg/day and 1.0 g BTP/kg/day groups, each mated with vehicle controls, demonstrated that TCP caused 100% infertility in male rats but did not affect reproduction in females. BTP caused a significant decline in reproduction in female rats characterized by low mating and fertility indices, decreased number of litters, and abnormal estrous cycles. Fertility was decreased in the BTP-dosed male rats. Both sexes of rats in the crossover experiment with TCP and BTP had significant decreases in terminal body weights and increases in adrenal gland and liver weights. Only TCP-dosed male rats had significantly decreased testicular and epididymal weights. TCP-dosed female rats had increased ovarian weights, while BTP-dosed females had significantly lower uterine weights. The results of this study indicate that BTP and TCP are reproductive toxicants in F344 rats. (C) 1994 Society of Toxicology. C1 OHIO STATE UNIV, DEPT VET PATHOBIOL, COLUMBUS, OH 43210 USA. MANTECH ENVIRONM TECHNOL INC, DAYTON, OH 45421 USA. RP LATENDRESSE, JR (reprint author), NATL NAVAL MED CTR, DIV TOX HAZARDS,TOXICOL DETACHMENT,BLDG 79, 2856 G ST, AREA B, WRIGHT PATTERSON AFB, OH 45433 USA. RI Latendresse, John/A-9215-2009 NR 25 TC 16 Z9 19 U1 3 U2 12 PU ACADEMIC PRESS INC JNL-COMP SUBSCRIPTIONS PI SAN DIEGO PA 525 B ST, STE 1900, SAN DIEGO, CA 92101-4495 SN 0272-0590 J9 FUND APPL TOXICOL JI Fundam. Appl. Toxicol. PD APR PY 1994 VL 22 IS 3 BP 392 EP 399 DI 10.1006/faat.1994.1044 PG 8 WC Toxicology SC Toxicology GA NG988 UT WOS:A1994NG98800007 PM 8050634 ER PT J AU DUNTEMANN, TJ LAWSON, JM DRESNER, DM PETERSON, RB COYLE, WJ NEMEC, RL AF DUNTEMANN, TJ LAWSON, JM DRESNER, DM PETERSON, RB COYLE, WJ NEMEC, RL TI HISTOLOGIC-FINDINGS IN ASYMPTOMATIC PATIENTS WITH CHRONIC TRANSAMINASE ELEVATIONS SO GASTROENTEROLOGY LA English DT Meeting Abstract C1 USN,MED CTR,DEPT MED,PORTSMOUTH,VA 23708. NR 0 TC 0 Z9 0 U1 0 U2 0 PU W B SAUNDERS CO PI PHILADELPHIA PA INDEPENDENCE SQUARE WEST CURTIS CENTER, STE 300, PHILADELPHIA, PA 19106-3399 SN 0016-5085 J9 GASTROENTEROLOGY JI Gastroenterology PD APR PY 1994 VL 106 IS 4 SU S BP A886 EP A886 PG 1 WC Gastroenterology & Hepatology SC Gastroenterology & Hepatology GA NH909 UT WOS:A1994NH90903524 ER PT J AU SCALES, WA BERNHARDT, PA GANGULI, G SIEFRING, CL RODRIGUEZ, P AF SCALES, WA BERNHARDT, PA GANGULI, G SIEFRING, CL RODRIGUEZ, P TI SMALL-SCALE PLASMA IRREGULARITIES PRODUCED DURING ELECTRON-ATTACHMENT CHEMICAL RELEASES SO GEOPHYSICAL RESEARCH LETTERS LA English DT Article AB In situ measurements of small-scale plasma density irregularities made during sounding rocket experiments that released electron attachment materials into the ionosphere are presented. A 2D electrostatic simulation model that includes attachment chemistry is used to study the source and evolution of these irregularities. The simulation shows (1) that large electron flow velocity shears develop on the boundary of the electron depletion and (2) these shears drive a plasma instability that is the likely source of the irregularities. C1 USN,RES LAB,DIV PLASMA PHYS,WASHINGTON,DC 20375. RP SCALES, WA (reprint author), VIRGINIA POLYTECH INST & STATE UNIV,BRADLEY DEPT ELECT ENGN,BLACKSBURG,VA 24061, USA. NR 12 TC 13 Z9 14 U1 0 U2 1 PU AMER GEOPHYSICAL UNION PI WASHINGTON PA 2000 FLORIDA AVE NW, WASHINGTON, DC 20009 SN 0094-8276 J9 GEOPHYS RES LETT JI Geophys. Res. Lett. PD APR 1 PY 1994 VL 21 IS 7 BP 605 EP 608 DI 10.1029/94GL00369 PG 4 WC Geosciences, Multidisciplinary SC Geology GA NE512 UT WOS:A1994NE51200025 ER PT J AU KOSHY, A GROVER, S SHABRAWY, MA PACSA, A ALANEZI, AH ALNAKIB, B ALMUFTI, S RICHARDS, AL BURANS, J CARL, M HYAMS, KC AF KOSHY, A GROVER, S SHABRAWY, MA PACSA, A ALANEZI, AH ALNAKIB, B ALMUFTI, S RICHARDS, AL BURANS, J CARL, M HYAMS, KC TI RAPID DECLINE IN ANTIBODIES TO HEPATITIS-E VIRUS MAY EXPLAIN FREQUENCY OF ACUTE HEPATITIS-E INFECTION IN ADULTS FROM ENDEMIC COUNTRIES SO HEPATOLOGY LA English DT Meeting Abstract C1 USN,MED RES INST,BETHESDA,MD 20814. KUWAIT UNIV,FAC MED,KUWAIT,KUWAIT. NR 0 TC 0 Z9 0 U1 0 U2 0 PU W B SAUNDERS CO PI PHILADELPHIA PA INDEPENDENCE SQUARE WEST CURTIS CENTER, STE 300, PHILADELPHIA, PA 19106-3399 SN 0270-9139 J9 HEPATOLOGY JI Hepatology PD APR PY 1994 VL 19 IS 4 BP I85 EP I85 PG 1 WC Gastroenterology & Hepatology SC Gastroenterology & Hepatology GA ND702 UT WOS:A1994ND70200230 ER PT J AU KROWNE, CM AF KROWNE, CM TI ON CODE AVAILABILITY AS A CONDITION FOR ACCEPTANCE OF PAPERS SO IEEE ANTENNAS AND PROPAGATION MAGAZINE LA English DT Letter RP KROWNE, CM (reprint author), USN,RES LAB,CODE 68503,WASHINGTON,DC 20375, USA. NR 0 TC 0 Z9 0 U1 3 U2 3 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 1045-9243 J9 IEEE ANTENNAS PROPAG JI IEEE Antennas Propag. Mag. PD APR PY 1994 VL 36 IS 2 BP 89 EP 89 PG 1 WC Engineering, Electrical & Electronic; Telecommunications SC Engineering; Telecommunications GA PT610 UT WOS:A1994PT61000017 ER PT J AU RAMESH, B DHAR, V AF RAMESH, B DHAR, V TI REPRESENTING AND MAINTAINING PROCESS KNOWLEDGE FOR LARGE-SCALE SYSTEMS-DEVELOPMENT SO IEEE EXPERT-INTELLIGENT SYSTEMS & THEIR APPLICATIONS LA English DT Article ID INFORMATION AB THE REMAP SYSTEM USES A SEMIFORMAL REPRESENTATION THAT SUPPORTS THE DESIGN AND MAINTENANCE OF LARGE-SCALE SOFTWARE SYSTEMS. THE CONCEPTUAL MODEL RELATES DESIGN RATIONALE KNOWLEDGE TO THE RESULTING SYSTEM. C1 NYU,STERN SCH BUSINESS,DEPT INFORMAT SYST,NEW YORK,NY 10003. RP RAMESH, B (reprint author), USN,POSTGRAD SCH,CODE AS RA,341 INGERSOLL HALL,MONTEREY,CA 93943, USA. RI Ramesh, Balasubramaniam/C-2565-2008 NR 18 TC 11 Z9 11 U1 0 U2 0 PU IEEE COMPUTER SOC PI LOS ALAMITOS PA 10662 LOS VAQUEROS CIRCLE, PO BOX 3014, LOS ALAMITOS, CA 90720-1264 SN 0885-9000 J9 IEEE EXPERT JI IEEE Expert-Intell. Syst. Appl. PD APR PY 1994 VL 9 IS 2 BP 54 EP 59 DI 10.1109/64.294137 PG 6 WC Computer Science, Artificial Intelligence; Engineering, Electrical & Electronic SC Computer Science; Engineering GA NW850 UT WOS:A1994NW85000007 ER PT J AU NOVARINI, JC CARUTHERS, JW AF NOVARINI, JC CARUTHERS, JW TI THE PARTITION WAVE-NUMBER IN ACOUSTIC BACKSCATTERING FROM A 2-SCALE ROUGH-SURFACE DESCRIBED BY A POWER-LAW SPECTRUM SO IEEE JOURNAL OF OCEANIC ENGINEERING LA English DT Article ID SEA-SURFACE; SCATTERING; MODEL; STRENGTH AB Scattering from the ocean bottom is often assumed to be controlled by two spatial scales: the larger scale associated with reflections from plane facets, and the smaller one associated with diffuse scattering from height variations. Choosing the wavenumber for this partitioning has proven to be important but troublesome. For this work, scattering data are simulated using Helmholtz-Kirchhoff or physical optics theory and selected input geomorphology. These data are inverted to provide rms slope of facets and rms heights of small-scale roughness using a simple two-scale roughness model introduced recently (J. W. Caruthers and J. C. Novarini, IEEE J. Oceanic Eng., vol. 18, pp. 100-106, 1993). Bottom relief is described by power spectra of the power law form, and the bottom is assumed to be impenetrable. The work introduces a new criterion for effecting this partition based on setting a roughness parameter equal to unity. The criterion is shown to be valid for the cases analyzed based on the ability of the inversion model to recover the input geomorphology. C1 USN,RES LAB,BAY ST LOUIS,MS 39529. RP NOVARINI, JC (reprint author), PLANNING SYST INC,SLIDELL,LA 70458, USA. NR 20 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 0364-9059 J9 IEEE J OCEANIC ENG JI IEEE J. Ocean. Eng. PD APR PY 1994 VL 19 IS 2 BP 200 EP 207 DI 10.1109/48.286642 PG 8 WC Engineering, Civil; Engineering, Ocean; Engineering, Electrical & Electronic; Oceanography SC Engineering; Oceanography GA NR065 UT WOS:A1994NR06500007 ER PT J AU ZIOMEK, LJ AF ZIOMEK, LJ TI SOUND-PRESSURE LEVEL CALCULATIONS USING THE RRA ALGORITHM FOR DEPTH-DEPENDENT SPEEDS OF SOUND VALID AT TURNING-POINTS AND FOCAL POINTS SO IEEE JOURNAL OF OCEANIC ENGINEERING LA English DT Article AB Sound-pressure level (SPL) calculations are made along individual ray paths for arbitrary, one-dimensional, depth-dependent speeds of sound using an enhanced version of the RRA (recursive ray acoustics) algorithm. The SPI, calculations are valid (i.e., finite) at turning points and focal points and do not require the use of Airy functions. The SPI, calculations include the effects of frequency-dependent volume attenuation and frequency-dependent attenuation due to surface and bottom reflections. The ocean surface and bottom are treated as boundaries between viscous fluid media. Although the ocean surface is modeled as a planar boundary, the bathymetry is an arbitrary function of horizontal range. Sound speed versus depth and bathymetric data are represented by orthogonal function expansions. Computer simulation results from preliminary test cases are presented. RP ZIOMEK, LJ (reprint author), USN,POSTGRAD SCH,DEPT ELECT & COMP ENGN,CODE EC-ZM,MONTEREY,CA 93943, USA. NR 7 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 0364-9059 J9 IEEE J OCEANIC ENG JI IEEE J. Ocean. Eng. PD APR PY 1994 VL 19 IS 2 BP 242 EP 248 DI 10.1109/48.286647 PG 7 WC Engineering, Civil; Engineering, Ocean; Engineering, Electrical & Electronic; Oceanography SC Engineering; Oceanography GA NR065 UT WOS:A1994NR06500012 ER PT J AU SCHEPS, R MYERS, JF AF SCHEPS, R MYERS, JF TI DUAL-WAVELENGTH COUPLED-CAVITY TI-SAPPHIRE LASER WITH ACTIVE MIRROR FOR ENHANCED RED OPERATION AND EFFICIENT INTRACAVITY SUM-FREQUENCY GENERATION AT 459 NM SO IEEE JOURNAL OF QUANTUM ELECTRONICS LA English DT Article ID ND-YAG LASER; BLUE-LIGHT; KTP; RADIATION; CW AB Sum frequency generation at 459 nm is demonstrated in a dual-wavelength coupled-cavity Ti:sapphire laser operating simultaneously at 808 nm and 1.06 mum. Enhanced operation of the Ti:sapphire laser at 1.06 mum is provided by a diode-pumped Nd:YAG active mirror. Comparable intracavity power is produced at both wavelengths, and 109 mW at 459 nm was generated with an intracavity KTP crystal. The 459-nm linewidth is 1 pm, and the conversion efficiency is 16%. RP SCHEPS, R (reprint author), USN,CTR COMMAND CONTROL & OCEAN SURVEILLANCE,DEPT SURVEILLANCE,SAN DIEGO,CA 92152, USA. NR 26 TC 13 Z9 13 U1 0 U2 0 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0018-9197 J9 IEEE J QUANTUM ELECT JI IEEE J. Quantum Electron. PD APR PY 1994 VL 30 IS 4 BP 1050 EP 1057 DI 10.1109/3.291375 PG 8 WC Engineering, Electrical & Electronic; Optics; Physics, Applied SC Engineering; Optics; Physics GA NV756 UT WOS:A1994NV75600023 ER PT J AU FRANKEL, MY AF FRANKEL, MY TI 500-GHZ CHARACTERIZATION OF AN OPTOELECTRONIC S-PARAMETER TEST STRUCTURE SO IEEE MICROWAVE AND GUIDED WAVE LETTERS LA English DT Article AB We propose a compact, high-bandwidth optoelectronic S-parameter test structure and characterize its performance via electrooptic sampling over a 500-GHz frequency range. The test structure is shown to be well-behaved over a 300-GHz bandwidth, with further improvement potential. Active devices can be wirebonded into the structure for characterization, or they can be integrated on-wafer for improved performance. RP FRANKEL, MY (reprint author), USN,RES LAB,CODE 5670,WASHINGTON,DC 20375, USA. NR 0 TC 13 Z9 13 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 1051-8207 J9 IEEE MICROW GUIDED W JI IEEE Microw. Guided Wave Lett. PD APR PY 1994 VL 4 IS 4 BP 118 EP 120 DI 10.1109/75.282578 PG 3 WC Engineering, Electrical & Electronic SC Engineering GA NL836 UT WOS:A1994NL83600007 ER PT J AU ORAZI, RJ MCLANDRICH, MN AF ORAZI, RJ MCLANDRICH, MN TI BIDIRECTIONAL TRANSMISSION AT 1.55 MICRONS USING FUSED FIBER NARROW CHANNEL WAVELENGTH-DIVISION MULTIPLEXORS AND ERBIUM-DOPED FIBER AMPLIFIERS SO IEEE PHOTONICS TECHNOLOGY LETTERS LA English DT Article AB Bidirectional transmission of data over 218 km of dispersion shifted fiber has been demonstrated. A wavelength division multiplexing (WDM) scheme is used in which both laser wavelengths are within the 1.5 micron region. Fused fiber WDMs with channel separations of 16 nanometers are used to multiplex signals from two DFB lasers, and Erbium-doped fiber amplifiers are used at each end of the link in a simultaneous pre/post amplifier configuration. RP ORAZI, RJ (reprint author), USN,CTR CONTROL & OCEAN SURVEILLANCE,DIV RDT & E,SAN DIEGO,CA 92152, USA. NR 5 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 1041-1135 J9 IEEE PHOTONIC TECH L JI IEEE Photonics Technol. Lett. PD APR PY 1994 VL 6 IS 4 BP 571 EP 574 DI 10.1109/68.281830 PG 4 WC Engineering, Electrical & Electronic; Optics; Physics, Applied SC Engineering; Optics; Physics GA NJ708 UT WOS:A1994NJ70800034 ER PT J AU SANGSTON, KJ GERLACH, KR AF SANGSTON, KJ GERLACH, KR TI COHERENT DETECTION OF RADAR TARGETS IN A NON-GAUSSIAN BACKGROUND SO IEEE TRANSACTIONS ON AEROSPACE AND ELECTRONIC SYSTEMS LA English DT Article ID MARITIME SURVEILLANCE RADAR; SEA CLUTTER; PREDICTION; STATISTICS; WAVES; NOISE AB The problem of detecting radar targets against a background of coherent, correlated, non-Gaussian clutter is studied with a two-step procedure. In the first step, the structure of the amplitude and the multivariate probability density functions (pdfs) describing the statistical properties of the clutter is derived. The starting point for this derivation is the basic scattering problem, and the statistics are obtained from an extension of the Central Limit Theorem (CLT). This extension leads to modeling the clutter amplitude statistics by a mixture of Rayleigh distributions. The end product of the first step is a multidimensional pdf in the form of a Gaussian mixture, which is then used in step 2. The aim of step 2 is to derive both the optimal and a suboptimal detection structure for detecting radar targets in this type of clutter. Some performance results for the new detection processor are also given. RP SANGSTON, KJ (reprint author), USN,RES LAB,DIV RADAR,CODE 53401,WASHINGTON,DC 20375, USA. NR 25 TC 157 Z9 159 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 0018-9251 J9 IEEE T AERO ELEC SYS JI IEEE Trans. Aerosp. Electron. Syst. PD APR PY 1994 VL 30 IS 2 BP 330 EP 340 DI 10.1109/7.272258 PG 11 WC Engineering, Aerospace; Engineering, Electrical & Electronic; Telecommunications SC Engineering; Telecommunications GA ND687 UT WOS:A1994ND68700005 ER PT J AU GERLACH, K AF GERLACH, K TI CONVERGENCE RATE OF AN SMI CANCELER IN NONSTATIONARY NOISE SO IEEE TRANSACTIONS ON AEROSPACE AND ELECTRONIC SYSTEMS LA English DT Letter ID ADAPTIVE ALGORITHMS; GRAM-SCHMIDT AB Convergence results for the sample matrix inversion (SMI) canceler algorithm in nonstationary noise are presented. Exact results are given for the convergence rate of the average output noise power residue of the canceler normalized to the quiescent average output noise power residue for a two-input canceler (one auxiliary), and lower and upper bounds are derived for cancelers with two or more inputs under the assumption that there is no internal noise. These bounds are a function of the number of independent samples processed per channel (main and auxiliary), the number of auxiliary input channels, and the external noise environment. The external noise environment is modeled as a single interfering source that is conditionally Gaussian, with a power level specified at each sampling time instant. Furthermore, this model is generalized in the sense that a joint probability distribution function is defined for the power levels over a canceler processing batch. This leads to the capability of modeling and evaluating the SMI canceler in a variety of nonstationary single interference scenarios. RP GERLACH, K (reprint author), USN,RES LAB,CODE 5341,WASHINGTON,DC 20375, USA. NR 11 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 0018-9251 J9 IEEE T AERO ELEC SYS JI IEEE Trans. Aerosp. Electron. Syst. PD APR PY 1994 VL 30 IS 2 BP 599 EP 604 DI 10.1109/7.272281 PG 6 WC Engineering, Aerospace; Engineering, Electrical & Electronic; Telecommunications SC Engineering; Telecommunications GA ND687 UT WOS:A1994ND68700028 ER PT J AU STRIFORS, HC GAUNAURD, GC BRUSMARK, B ABRAHAMSON, S AF STRIFORS, HC GAUNAURD, GC BRUSMARK, B ABRAHAMSON, S TI TRANSIENT INTERACTIONS OF AN EM PULSE WITH A DIELECTRIC SPHERICAL-SHELL SO IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION LA English DT Article ID SINGULARITY EXPANSION METHOD; IDENTIFICATION; TARGETS AB We study the scattering interaction of short electromagnetic pulses with a spherical target. The target is assumed penetrable and we model it as an air-filled dielectric shell. The radar cross-section (RCS) of such a target is obtained and its resonance features are analyzed. A dielectric composition makes the resonance features become very prominent compared with the case of a perfectly conducting sphere. When the interrogating waveform is a pulse of short duration, the resonance features of the RCS can be extracted within the frequency band of the spectrum of the incident pulse. To verify our theoretical predictions we illuminate spherical targets with short, broad-band pulses using an impulse radar system. The actual shape of the pulse that is incident on the targets is theoretically modeled using a digital filter design technique together with pulse returns from a reference target. We verify that the shape of the predicted, backscattered pulse that results from our design method agrees well with the experimental findings using three additional targets of different sizes and materials. We investigate in the combined time-frequency domain the development in time of the various frequency features of the spectra of backscattered pulses using time-windowed Fourier transforms. The methodology that we have developed can handle broad-band pulses of any sufficiently smooth spectrum, interacting with (lossy or lossless) dielectric scatterers, and can extract resonance features within the frequency band of the spectrum of the transmitted pulse. Accordingly, this method could be also used for assessing the performance of high-power impulse radar systems. C1 NATL DEF RES ESTAB,FOA 3,DIV SURVEILLANCE & SEEKER SYST,S-58111 LINKOPING,SWEDEN. USN,CTR SURFACE WARFARE,RES DEPT,SILVER SPRING,MD 20903. RP STRIFORS, HC (reprint author), NATL DEF RES ESTAB,FOA 2,S-17290 SUNDBYBERG,SWEDEN. NR 37 TC 11 Z9 11 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 0018-926X J9 IEEE T ANTENN PROPAG JI IEEE Trans. Antennas Propag. PD APR PY 1994 VL 42 IS 4 BP 453 EP 462 DI 10.1109/8.286212 PG 10 WC Engineering, Electrical & Electronic; Telecommunications SC Engineering; Telecommunications GA NQ840 UT WOS:A1994NQ84000002 ER PT J AU DRIELS, M BEIERL, P AF DRIELS, M BEIERL, P TI A FINITE MEMORY MODEL FOR HAPTIC TELEOPERATION SO IEEE TRANSACTIONS ON SYSTEMS MAN AND CYBERNETICS LA English DT Letter AB This paper is concerned with modeling the haptic exploration and recognition of objects using a teleoperator mechanism. Three factors are identified which determine the success with which objects may be recognized: a) correct feature identification, b) interpretation of spatial data between features, and c) the ability to retain in memory the sequence of features identified. A haptic cognitive model is proposed which incorporates these factors, with emphasis on part c). The performance of the cognitive model is assessed with respect to previously obtained data, and further experiments are conducted to determine the number of features an operator can correctly recall when probing a remote object. RP DRIELS, M (reprint author), USN,POSTGRAD SCH,MONTEREY,CA 93943, USA. NR 12 TC 0 Z9 0 U1 0 U2 0 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0018-9472 J9 IEEE T SYST MAN CYB JI IEEE Trans. Syst. Man Cybern. PD APR PY 1994 VL 24 IS 4 BP 690 EP 698 DI 10.1109/21.286390 PG 9 WC Computer Science, Cybernetics; Engineering, Electrical & Electronic SC Computer Science; Engineering GA NR450 UT WOS:A1994NR45000014 ER PT J AU Haga, WJ Zviran, M AF Haga, W. J. Zviran, M. TI Information systems effectiveness: research designs for causal inference SO INFORMATION SYSTEMS JOURNAL LA English DT Article DE effectiveness; effectiveness measurement; productivity; productivity assessment; research design; validity AB This paper examines the capacity of the research designs of 37 empirical studies of information systems (IS) effectiveness to provide a basis for the development of theories about behaviour related to IS effectiveness. The power of each study to support causal inference was evaluated in terms of (a) its handling of the time dimension, (b) its ability to weigh differences and (c) its resistance to internal validity threats that pose alternative explanations for its reported findings. Of the reviewed studies, 29.7% could account for the time dimension, 32.4% employed a comparison group and 16.2% were not susceptible to any internal validity threats. Only 13.5% of the studies combined an accounting for the time dimension with the use of a comparison group. Of these, however, only 5.4% were also invulnerable to internal validity threats. The research designs of nearly 95% of these published studies were deficient in supporting causal inference. In those studies, suggestions that one variable was causally related to another variable could not be substantiated. Encouragement for the future capacity of IS effectiveness research to support causal inference was found in a trend towards the use of quasiexperimental designs. Recommendations are made regarding ways to increase the inferential capacity of research designs employed in the study of IS effectiveness. C1 [Haga, W. J.; Zviran, M.] Naval Postgrad Sch, Dept Syst Management, Monterey, CA 93943 USA. RP Haga, WJ (reprint author), Naval Postgrad Sch, Dept Syst Management, Monterey, CA 93943 USA. NR 121 TC 3 Z9 4 U1 4 U2 5 PU WILEY-BLACKWELL PI HOBOKEN PA 111 RIVER ST, HOBOKEN 07030-5774, NJ USA SN 1350-1917 EI 1365-2575 J9 INFORM SYST J JI Inf. Syst. J. PD APR PY 1994 VL 4 IS 2 BP 141 EP 166 DI 10.1111/j.1365-2575.1994.tb00048.x PG 26 WC Information Science & Library Science SC Information Science & Library Science GA V34KM UT WOS:000209085300005 ER PT J AU YOST, DS AF YOST, DS TI POLITICAL-PHILOSOPHY AND THE THEORY OF INTERNATIONAL-RELATIONS SO INTERNATIONAL AFFAIRS LA English DT Article ID LIBERAL LEGACIES; FOREIGN-AFFAIRS; SOCIETY; KANT AB The recently published lectures by Martin Wight (1913-72) on the history of Western thought regarding international politics are of exceptional importance. As David Yost points out, the lectures answer a number of questions about what Wight meant by 'traditions' and what his own position was with regard to their validity. Wight's analysis and organizing framework capture and clarify a complex historical reality with greater justice and lucidity than many others that have been proposed. Moreover, the lectures place in perspective what has been the most indisputable criticism of Wight's approach-his 'Eurocentrism' and neglect of non-Western traditions-and illustrate opportunities for further research building on these foundations. C1 USN,POSTGRAD SCH,MONTEREY,CA 93940. NR 67 TC 9 Z9 9 U1 0 U2 0 PU CAMBRIDGE UNIV PRESS PI NEW YORK PA 40 WEST 20TH STREET, NEW YORK, NY 10011-4211 SN 0020-5850 J9 INT AFF JI Int. Aff. PD APR PY 1994 VL 70 IS 2 BP 263 EP 290 DI 10.2307/2625234 PG 28 WC International Relations SC International Relations GA NE641 UT WOS:A1994NE64100004 ER PT J AU DRIELS, MR PATHRE, US AF DRIELS, MR PATHRE, US TI ROBOT CALIBRATION USING AN AUTOMATIC THEODOLITE SO INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY LA English DT Article DE ROBOTICS; CALIBRATION; VISION AB The Vision Based Automatic Theodolite (VBAT) is an automatic partial pose measurement system for robot calibration. It uses low resolution rotation stages and resolution enhancement from a vision system to determine the line-of-sight to a spherical illuminated target. Automatic tracking, focusing, and centring provide the calibration system with speed, reliability, and repeatability. A kinematic model of the VBAT is described which includes both the mechanical parts of the system and the optics, using a modified Denavit-Hartenberg approach. All parameters in the VBAT model are identified and embedded into the system controller producing an instrument of 2 are second accuracy. The system is then used in a conventional manner to calibrate a six degree of freedom PUMA robot, and the results compared to another calibration of the same arm by a coordinate measuring machine with repeatability and accuracy of 0.02 mm. The calibration using the VBAT enhances the accuracy of the PUMA to within 0.2 mm of that produced by the CMM calibration, compared to an accuracy of 14 mm prior to calibration. C1 DENEB ROBOT,TROY,MI 48098. RP DRIELS, MR (reprint author), USN,POSTGRAD SCH,DEPT MECH ENGN,MONTEREY,CA 93943, USA. NR 15 TC 9 Z9 9 U1 1 U2 3 PU SPRINGER-VERLAG LONDON LTD PI GODALMING PA SWEETAPPLE HOUSE CATTESHALL ROAD, GODALMING, SURREY, ENGLAND GU7 3DJ SN 0268-3768 J9 INT J ADV MANUF TECH JI Int. J. Adv. Manuf. Technol. PD APR PY 1994 VL 9 IS 2 BP 114 EP 125 DI 10.1007/BF01750418 PG 12 WC Automation & Control Systems; Engineering, Manufacturing SC Automation & Control Systems; Engineering GA QD801 UT WOS:A1994QD80100006 ER PT J AU BERNHARDT, PA AF BERNHARDT, PA TI COMMUNICATIONS USING CHAOTIC FREQUENCY-MODULATION SO INTERNATIONAL JOURNAL OF BIFURCATION AND CHAOS LA English DT Article ID SYSTEMS AB Chaotic Frequency Modulation (CFM) provides the basis for a nonlinear communications system with (1) good noise suppression and (2) analogue signal encryption for private and secure communications links. CFM is a generalization of conventional Wideband Frequency Modulation (WFM) where the information about modulation samples m(k) axe contained in the lengths of the periods p(k) for the kth cycle of the WFM waveform. A WFM modulator produces wave-form periods described by an invertible function of the form p(k) = F(m(k)). Chaotic FM uses a map of the pulse periods to produce a noise-like pulse train even with a constant signal. The basis for CFM is a function p(k) = F(m(k); p(k-1), p(k-2), ..., p(k-1)), where i is the dimensionality of the map. A practical realization for a CFM transmitter employs an autonomous chaotic relaxation oscillator (ACRO) circuit for use as a chaotic voltage-controlled oscillator (CVCO). The ACRO is simple to construct, consisting of only two capacitors, one inductor, a bistable nonlinear element, and a modulated current source. The CVCO period (p(k)) is a nonlinear function of the current (m(k)) and the two previous pulse periods. Demodulation requires the use of at least three successive waveform-periods. Experimental and theoretical studies of the CVCO circuit have shown that (1) the ACRO return maps of pulse periods are embedded in three dimensions, (2) chaotic outputs axe difficult to decode without prior knowledge of the circuit parameters, and (3) demodulation may be accomplished with a digital signal processor. RP BERNHARDT, PA (reprint author), USN,RES LAB,DIV PLASMA PHYS,WASHINGTON,DC 20375, USA. NR 17 TC 10 Z9 11 U1 0 U2 2 PU WORLD SCIENTIFIC PUBL CO PTE LTD PI SINGAPORE PA 5 TOH TUCK LINK, SINGAPORE 596224, SINGAPORE SN 0218-1274 J9 INT J BIFURCAT CHAOS JI Int. J. Bifurcation Chaos PD APR PY 1994 VL 4 IS 2 BP 427 EP 440 DI 10.1142/S0218127494000289 PG 14 WC Mathematics, Interdisciplinary Applications; Multidisciplinary Sciences SC Mathematics; Science & Technology - Other Topics GA NQ715 UT WOS:A1994NQ71500009 ER PT J AU SKORUPKA, CW KROWNE, CM PECORA, LM AF SKORUPKA, CW KROWNE, CM PECORA, LM TI FRACTAL, NONCHAOTIC OSCILLATIONS IN A MICROWAVE TED SO INTERNATIONAL JOURNAL OF ELECTRONICS LA English DT Article ID STRANGE NONCHAOTIC ATTRACTORS; SEMICONDUCTORS; SYSTEMS AB We analyse the time domain behaviour of a one-dimensional model of the Gunn effect, subject to a two-frequency or quasi-periodic drive. We find that this system exhibits a behaviour known as strange-non-chaotic, i.e. the system exhibits a strange or fractal attractor, yet is not sensitive to initial conditions (a zero Lyapunov exponent). C1 USN,RES LAB,DIV ELECTR SCI & TECH,MICROWAVE TECHNOL BRANCH,WASHINGTON,DC 20375. USN,RES LAB,DIV MAT SCI & TECH,WASHINGTON,DC 20375. RP SKORUPKA, CW (reprint author), SUSQUEHANNA UNIV,DEPT PHYS,SELINSGROVE,PA, USA. NR 23 TC 1 Z9 1 U1 0 U2 0 PU TAYLOR & FRANCIS LTD PI LONDON PA ONE GUNDPOWDER SQUARE, LONDON, ENGLAND EC4A 3DE SN 0020-7217 J9 INT J ELECTRON JI Int. J. Electron. PD APR PY 1994 VL 76 IS 4 BP 583 EP 588 DI 10.1080/00207219408925954 PG 6 WC Engineering, Electrical & Electronic SC Engineering GA NN348 UT WOS:A1994NN34800003 ER PT J AU STOCK, RJ ZAINO, R BUNDY, BN ASKIN, FB WOODWARD, J FETTER, B PAULSON, JA DISAIA, PJ STEHMAN, FB AF STOCK, RJ ZAINO, R BUNDY, BN ASKIN, FB WOODWARD, J FETTER, B PAULSON, JA DISAIA, PJ STEHMAN, FB TI EVALUATION AND COMPARISON OF HISTOPATHOLOGIC GRADING SYSTEMS OF EPITHELIAL CARCINOMA OF THE UTERINE CERVIX - GYNECOLOGIC-ONCOLOGY-GROUP STUDIES SO INTERNATIONAL JOURNAL OF GYNECOLOGICAL PATHOLOGY LA English DT Article DE HISTOLOGIC CLASSIFICATION; HISTOPATHOLOGIC GRADING SYSTEMS; ADVANCED CARCINOMA UTERINE CERVIX; STENDAHL SCORING SYSTEM; REAGAN-WENTZ CELL TYPE ID SQUAMOUS-CELL CARCINOMA; HISTOLOGIC CLASSIFICATION; RADIATION-THERAPY; CANCER; PROGNOSIS; HYDROXYUREA; SURVIVAL AB The subjects of this study are 445 patients with advanced cervical cancer treated by standardized radiation therapy. Upon entry into one of two Gynecologic Oncology Group (GOG) protocols, original pathologic diagnoses and histologic tumor descriptions for each patient were compared with separate evaluations made by a consensus opinion of two GOG pathologists. A review diagnosis using grade, cell type, and the Stendahl scoring system was then made by the first author (R.J.S.) without knowledge of the prior diagnoses. Of the original pathologists' diagnoses, 21% did not include grade or cell type. There was little agreement among the different pathologists as to the use of either specific grade or cell type. Histologic grade, ir-respective of the pathologists making the diagnosis, had no correlation to prognosis. The Reagan and Wentz large-cell keratinizing (LCK) cell type, when applied by the author to tumors with any form of squamous keratinization present, identified a group of patients with a poorer prognosis, although not independently of other prognostic factors. The Stendahl scoring system identified a number of patients with both a poorer and better prognosis. This was statistically significant and independent of other risk factors. A major limitation, however, was the number of patients evaluable because of inadequate biopsy material in 23.6% of the study group. C1 USN,DEPT OBSTET & GYNECOL & ANAT PATHOL,PORTSMOUTH,VA 23708. PENN STATE UNIV,MILTON S HERSHEY MED CTR,DEPT PATHOL,HERSHEY,PA 17033. NEW YORK STATE DEPT HLTH,ROSWELL PK MEM INST,GYNECOL ONCOL GRP,BUFFALO,NY 14263. JOHNS HOPKINS UNIV HOSP,DEPT SURG PATHOL,BALTIMORE,MD 21205. WALTER REED ARMY MED CTR,DEPT ANAT PATHOL,WASHINGTON,DC. UNIFORMED SERV UNIV HLTH SCI,DEPT PATHOL,BETHESDA,MD 20814. DUKE UNIV,MED CTR,DURHAM,NC 27710. COOPER HOSP UNIV MED CTR,CAMDEN,NJ. UNIV CALIF IRVINE,IRVINE CANC CTR,DEPT OBSTET & GYNECOL,IRVINE,CA 92717. INDIANA UNIV,MED CTR,DEPT OBSTET & GYNECOL,INDIANAPOLIS,IN 46204. FU NCI NIH HHS [CA 12484, CA 12534, CA 27816] NR 25 TC 12 Z9 13 U1 0 U2 0 PU LIPPINCOTT-RAVEN PUBL PI PHILADELPHIA PA 227 EAST WASHINGTON SQ, PHILADELPHIA, PA 19106 SN 0277-1691 J9 INT J GYNECOL PATHOL JI Int. J. Gynecol. Pathol. PD APR PY 1994 VL 13 IS 2 BP 99 EP 108 DI 10.1097/00004347-199404000-00001 PG 10 WC Obstetrics & Gynecology; Pathology SC Obstetrics & Gynecology; Pathology GA NB461 UT WOS:A1994NB46100001 PM 8005742 ER PT J AU THOMPSON, PE GODBEY, D HOBART, K GLASER, E KENNEDY, T TWIGG, M SIMONS, D AF THOMPSON, PE GODBEY, D HOBART, K GLASER, E KENNEDY, T TWIGG, M SIMONS, D TI PARAMETRIC INVESTIGATION OF SI1-XGEX/SI MULTIPLE-QUANTUM-WELL GROWTH SO JAPANESE JOURNAL OF APPLIED PHYSICS PART 1-REGULAR PAPERS SHORT NOTES & REVIEW PAPERS LA English DT Article; Proceedings Paper CT 5th International Symposium on Silicon Molecular Beam Epitaxy (SIMBE-5), at the 1993 International Conference on Solid State Devices and Materials (SSDM 93) CY AUG 30-SEP 01, 1993 CL NIPPON CONVENT CTR, MAKUHARI MESSE, JAPAN SP JAPAN SOC APPL PHYS HO NIPPON CONVENT CTR DE SI1-XGEX/SI MULTIPLE QUANTUM WELLS; PHOTOLUMINESCENCE; MOLECULAR BEAM EPITAXY; SECONDARY ION MASS SPECTROMETRY ID MOLECULAR-BEAM EPITAXY; CHEMICAL-VAPOR-DEPOSITION; MAGNETIC-RESONANCE; PHOTOLUMINESCENCE; LUMINESCENCE; SILICON AB Si0.8Ge0.2/Si multiple quantum wells (3 nm/30 nm) have been grown by molecular beam epitaxy and have been characterized using photoluminescence (PL), secondary ion mass spectrometry, and transmission electron microscopy. A parametric investigation relating the growth conditions to the PL was carried out. The existence of phonon-resolved band-edge PL appears to be strongly related to the background impurity concentration. The connection between phonon-resolved band-edge PL and higher substrate growth temperatures is probably due to the temperature- dependent incorporation of impurities. In the as-grown samples a correlation of the broad PL with platelet density in the quantum wells was observed. The broad PL may be associated with Cr at the platelets since a high temperature (710-degrees-C) anneal extinguished the broad PL and caused a reduction in the Cr found in the quantum wells, but had no effect on the platelet density. C1 NATL INST STAND & TECHNOL,GAITHERSBURG,MD 20899. RP THOMPSON, PE (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 14 TC 9 Z9 9 U1 0 U2 1 PU JAPAN J APPLIED PHYSICS PI MINATO-KU TOKYO PA DAINI TOYOKAIJI BLDG 24-8 SHINBASHI 4-CHOME, MINATO-KU TOKYO 105, JAPAN SN 0021-4922 J9 JPN J APPL PHYS 1 JI Jpn. J. Appl. Phys. Part 1 - Regul. Pap. Short Notes Rev. Pap. PD APR PY 1994 VL 33 IS 4B BP 2317 EP 2321 DI 10.1143/JJAP.33.2317 PG 5 WC Physics, Applied SC Physics GA NR959 UT WOS:A1994NR95900037 ER PT J AU GLASER, ER KENNEDY, TA KLEIN, PB GODBEY, DJ THOMPSON, PE AF GLASER, ER KENNEDY, TA KLEIN, PB GODBEY, DJ THOMPSON, PE TI TIME-RESOLVED OPTICALLY DETECTED MAGNETIC-RESONANCE OF LUMINESCENCE FROM SI/SI1-XGEX SUPERLATTICES SO JAPANESE JOURNAL OF APPLIED PHYSICS PART 1-REGULAR PAPERS SHORT NOTES & REVIEW PAPERS LA English DT Article; Proceedings Paper CT 5th International Symposium on Silicon Molecular Beam Epitaxy (SIMBE-5), at the 1993 International Conference on Solid State Devices and Materials (SSDM 93) CY AUG 30-SEP 01, 1993 CL NIPPON CONVENT CTR, MAKUHARI MESSE, JAPAN SP JAPAN SOC APPL PHYS HO NIPPON CONVENT CTR DE SI/SI1-XGEX SUPERLATTICES; PHOTOLUMINESCENCE; OPTICALLY DETECTED MAGNETIC RESONANCE; RECOMBINATION PROCESSES; LIFETIMES ID MOLECULAR-BEAM EPITAXY; BAND-EDGE LUMINESCENCE; QUANTUM-WELLS; PHOTOLUMINESCENCE; EXCITONS; SI1-XGEX; SILICON; LAYERS; SI AB Time-resolved optically detected magnetic resonance (TR-ODMR) experiments have been performed on Si/Si1-xGex superlattices grown by molecular beam epitaxy (MBE) on (001) Si. These structures exhibit a single, broad (full width at half-maximum amplitude approximately 70 meV) photoluminescence (PL) band with peak energy 100 meV below the expected band gap. Fast (tau less-than-or-equal-to 5 mus) and slow (tau congruent-to 20 As) processes have been separated with the TR-ODMR. The slow resonances are new and provide more detailed information on the nature of the recombination. These features are tentatively assigned to Ge-rich regions in the SiGe layers based on the resonance parameters and the faster spin-lattice relaxation. RP GLASER, ER (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 13 TC 0 Z9 0 U1 1 U2 1 PU JAPAN J APPLIED PHYSICS PI MINATO-KU TOKYO PA DAINI TOYOKAIJI BLDG 24-8 SHINBASHI 4-CHOME, MINATO-KU TOKYO 105, JAPAN SN 0021-4922 J9 JPN J APPL PHYS 1 JI Jpn. J. Appl. Phys. Part 1 - Regul. Pap. Short Notes Rev. Pap. PD APR PY 1994 VL 33 IS 4B BP 2357 EP 2360 DI 10.1143/JJAP.33.2357 PG 4 WC Physics, Applied SC Physics GA NR959 UT WOS:A1994NR95900045 ER PT J AU FERNSLER, RF HUBBARD, RF LAMPE, M AF FERNSLER, RF HUBBARD, RF LAMPE, M TI LONG-RANGE PROPAGATION OF HIGH-POWER, PULSED ELECTRON-BEAMS FOR WELDING AND MATERIALS PROCESSING APPLICATIONS SO JOURNAL OF APPLIED PHYSICS LA English DT Article ID RESISTIVE HOSE INSTABILITY; TRACKING AB The electron beams used commercially for welding and materials processing operate either in vacuum or at very short range in air, which limits system productivity and the types of applications allowed. We show here that these restrictions can be relaxed considerably by raising both the beam energy and current, from under 200 keV to a few MeV and from under 1 A to a few kA, respectively, with the beam chopped into short pulses to preserve average beam power. This technology is made possible by the recent development of high-power generators that produce low-emittance beams with radii as small as 1 mm, pulse lengths of tens of ns, and pulse repetition rates up to several kHz. After studying the constraints imposed by gas scattering and the resistive hose instability, we conclude that high-power beams can propagate and remain tightly pinched over tens of cm in ambient air, without need of external guide fields. Equally important, the propagation requirements can be significantly relaxed by using a narrow conducting pipe filled with air or another gas to guide the beam to the workpiece. RP FERNSLER, RF (reprint author), USN,RES LAB,PLASMA PHYS,BEAM PHYS BRANCH,WASHINGTON,DC 20375, USA. NR 45 TC 19 Z9 19 U1 0 U2 0 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0021-8979 J9 J APPL PHYS JI J. Appl. Phys. PD APR 1 PY 1994 VL 75 IS 7 BP 3278 EP 3293 DI 10.1063/1.356135 PG 16 WC Physics, Applied SC Physics GA NC839 UT WOS:A1994NC83900005 ER PT J AU PAULEY, PM CREASEY, RL CLARK, WL NASTROM, GD AF PAULEY, PM CREASEY, RL CLARK, WL NASTROM, GD TI COMPARISONS OF HORIZONTAL WINDS MEASURED BY OPPOSING BEAMS WITH THE FLATLAND ST RADAR AND BETWEEN FLATLAND MEASUREMENTS AND NMC ANALYSES SO JOURNAL OF ATMOSPHERIC AND OCEANIC TECHNOLOGY LA English DT Article AB This study examines the consistency between VHF horizontal wind measurements and those interpolated from routine objective analyses. First, the agreement between the two U components and between the two V components measured on opposing beams (here referred to as the beam-to-beam intercomparison) by the Flatland 49.8-MHz wind profiler is examined to determine the beam-to-beam consistency and relative precision of this radar. This part of the study demonstrates the ability of this technique to detect system problems affecting only one radar beam and provides a benchmark for comparison with radar systems operating near the Front Range of the Rockies and for the comparison in the second part of this study. This second comparison is between the Flatland observations and the spatially smooth winds from the National Meterological Center's (NMC) regional objective analysis for July through November 1990. The location of the Flatland profiler near Champaign-Urbana, Illinois, is free of significant orographic features, in contrast to the proximity to the Colorado Rockies of many of the radars employed in earlier studies. The beam-to-beam intercomparison is presented in terms of the mean and standard deviation of the differences between the measurements made on opposing beams. The Flatland difference standard deviations of about 0.8 m s-1 are roughly one-third of those for radars in the lee of the Rocky Mountains, reflecting reduced vertical velocities. However, the mean differences are approximately -0.25 m s-1 for both the U and V components, consistent with the tropospheric monthly mean downward motion of 2-6 cm s-1 indicated in the Flatland vertical beam measurements since its construction, including the period of this study. In fact, when the data were stratified into periods with and without precipitation, based on estimates of latent heating from the NMC data, the precipitation periods showed standard deviations of about 1.3 m s-1, with mean differences two to three times that for nonprecipitation cases. This behavior is consistent with larger downward velocities during precipitation, whether from clear-air or hydrometeor scatterers. Thus, these vertical-motion biases, which the authors believe are of atmospheric origin (whether bulk motion or reflectivity effects), must be accounted for in long-term climatological studies. Finally, for the Flatland-NMC comparison, 4-h averages of Flatland winds were chosen to better correspond to the spatially smooth NMC winds. The correlation coefficients, larger than 0.95, indicate very good agreement, but not as good as the 0.99 found in the beam-to-beam intercomparison. The larger 2.3 m s-1 difference standard deviations are similar to those found in studies comparing profiler and rawinsonde winds near the Front Range of the Rockies, indicating the applicability of the Taylor hypothesis implicit in this comparison of the 4-h temporally averaged Flatland winds and the spatially averaged NMC-analyzed winds. The consistency between these two datasets implies that increases in accuracy of objective analyses may result more from the increased time resolution of the profiler data rather than from an inherent increase in accuracy of the observations. RP PAULEY, PM (reprint author), USN,POSTGRAD SCH,DEPT METEOROL,CODE MR PA,MONTEREY,CA 93943, USA. NR 0 TC 6 Z9 6 U1 1 U2 1 PU AMER METEOROLOGICAL SOC PI BOSTON PA 45 BEACON ST, BOSTON, MA 02108-3693 SN 0739-0572 J9 J ATMOS OCEAN TECH JI J. Atmos. Ocean. Technol. PD APR PY 1994 VL 11 IS 2 BP 256 EP 274 DI 10.1175/1520-0426(1994)011<0256:COHWMB>2.0.CO;2 PN 1 PG 19 WC Engineering, Ocean; Meteorology & Atmospheric Sciences SC Engineering; Meteorology & Atmospheric Sciences GA NE047 UT WOS:A1994NE04700003 ER PT J AU CARNES, MR TEAGUE, WJ MITCHELL, JL AF CARNES, MR TEAGUE, WJ MITCHELL, JL TI INFERENCE OF SUBSURFACE THERMOHALINE STRUCTURE FROM FIELDS MEASURABLE BY SATELLITE SO JOURNAL OF ATMOSPHERIC AND OCEANIC TECHNOLOGY LA English DT Article AB Satellites now provide global measurements of the ocean's surface height and temperature. Ocean climatologies for the northwest Pacific and northwest Atlantic Oceans that relate sea surface height, sea surface temperature, day of the year, latitude, and longitude to temperature and salinity profiles were produced using least-squares regression. These analyses use over 33 000 profiles of historical temperature and salinity data and are considerably streamlined and compacted by expressing each profile in terms of empirical orthogonal functions. Evaluations and error analyses of the climatologies, including a comparison to the navy's Generalized Digital Environmental Model, were performed and differences between the regions are discussed. Two sample vertical sections are shown to be closely reproduced with the climatologies. Climatologies based on surface height and temperature are found to offer considerable improvement over climatologies based only on position. RP CARNES, MR (reprint author), USN,RES LAB,DEPT NAVY,BAY ST LOUIS,MS 39529, USA. NR 0 TC 25 Z9 27 U1 0 U2 0 PU AMER METEOROLOGICAL SOC PI BOSTON PA 45 BEACON ST, BOSTON, MA 02108-3693 SN 0739-0572 J9 J ATMOS OCEAN TECH JI J. Atmos. Ocean. Technol. PD APR PY 1994 VL 11 IS 2 BP 551 EP 566 DI 10.1175/1520-0426(1994)011<0551:IOSTSF>2.0.CO;2 PN 2 PG 16 WC Engineering, Ocean; Meteorology & Atmospheric Sciences SC Engineering; Meteorology & Atmospheric Sciences GA NE049 UT WOS:A1994NE04900010 ER PT J AU NAMBOODIRI, K GABER, BP EASWARAN, KRK BALASUBRAMANIAN, SV AF NAMBOODIRI, K GABER, BP EASWARAN, KRK BALASUBRAMANIAN, SV TI CALCIUM IONOPHORE, A23187 AND ITS AMINO-ACID COMPLEXES - SPECTROSCOPIC AND MOLECULAR MODELING STUDIES SO JOURNAL OF BIOMOLECULAR STRUCTURE & DYNAMICS LA English DT Article ID DIVALENT-CATION IONOPHORE; PHOSPHOLIPID-VESICLES AB The circular dichroism, fluorescence, Nuclear Magnetic Resonance and BLM conductance studies indicate that A23187 forms a stable complex with amino acids at low ionophore concentrations (<10(-4)M). However, A23187 prefers to be in a dimeric structure with no significant binding to amino acids, at concentrations higher than 10(-4)M. It was also observed that at lower concentrations, at which the amino acids bind to the ionophore, the affinity for calcium ions was several orders of magnitude lower than that at higher ionophore concentrations. We have also conducted molecular modeling studies to examine the structure of the A23187 dimer and its amino acid complexes. The results of these modeling studies strongly support our experimental results and validate the formation of a hydrogen bonded and energetically stable A23187 dimer and its amino acid complexes. C1 USN,RES LAB,CTR BIOMOLEC SCI & ENGN,WASHINGTON,DC 20375. INDIAN INST SCI,MOLEC BIOPHYS UNIT,BANGALORE 560012,KARNATAKA,INDIA. NR 19 TC 0 Z9 0 U1 0 U2 1 PU ADENINE PRESS INC PI GUILDERLAND PA PO BOX 355/340, GUILDERLAND, NY 12084 SN 0739-1102 J9 J BIOMOL STRUCT DYN JI J. Biomol. Struct. Dyn. PD APR PY 1994 VL 11 IS 5 BP 913 EP 926 PG 14 WC Biochemistry & Molecular Biology; Biophysics SC Biochemistry & Molecular Biology; Biophysics GA NT874 UT WOS:A1994NT87400001 PM 7946064 ER PT J AU WEISS, JN GARFINKEL, A SPANO, ML DITTO, WL AF WEISS, JN GARFINKEL, A SPANO, ML DITTO, WL TI CHAOS AND CHAOS CONTROL IN BIOLOGY SO JOURNAL OF CLINICAL INVESTIGATION LA English DT Editorial Material ID VENTRICULAR-FIBRILLATION; DYNAMICS; SYSTEM C1 UNIV CALIF LOS ANGELES, SCH MED, CARDIOVASC RES LAB, LOS ANGELES, CA 90024 USA. UNIV CALIF LOS ANGELES, SCH MED, DEPT MED, LOS ANGELES, CA 90024 USA. USN, CTR SURFACE WARFARE, SILVER SPRING, MD 20903 USA. GEORGIA INST TECHNOL, DEPT PHYS, ATLANTA, GA 30332 USA. RI Spano, Mark/B-6883-2011; OI Ditto, William/0000-0002-7416-8012 FU NHLBI NIH HHS [R01 HL-44880, R01 HL-36729] NR 24 TC 47 Z9 49 U1 0 U2 1 PU AMER SOC CLINICAL INVESTIGATION INC PI ANN ARBOR PA 35 RESEARCH DR, STE 300, ANN ARBOR, MI 48103 USA SN 0021-9738 EI 1558-8238 J9 J CLIN INVEST JI J. Clin. Invest. PD APR PY 1994 VL 93 IS 4 BP 1355 EP 1360 DI 10.1172/JCI117111 PG 6 WC Medicine, Research & Experimental SC Research & Experimental Medicine GA NF562 UT WOS:A1994NF56200004 PM 8163640 ER PT J AU SCANDRETT, CL KRIEGSMANN, GA AF SCANDRETT, CL KRIEGSMANN, GA TI DECOUPLING APPROXIMATIONS APPLIED TO AN INFINITE ARRAY OF FLUID-LOADED BAFFLED MEMBRANES SO JOURNAL OF COMPUTATIONAL PHYSICS LA English DT Article ID SCATTERING; WAVE; RADIATION; VIBRATION; SURFACES AB Application of a time-dependent nonlocal radiation boundary condition, used in conjunction with the finite difference technique, is applied to the acoustic problem of scattering from an infinite array of baffled, fluid-loaded membranes. The new boundary operator is compared with the second-order Engquist and Majda boundary operator and with several fluid/structure decoupling approximation techniques in the determination of scattering amplitudes. (C) 1994 Academic Press, Inc. C1 UNIV MED & DENT NEW JERSEY,NEW JERSEY MED SCH,DEPT MATH,NEWARK,NJ 07103. UNIV MED & DENT NEW JERSEY,NEW JERSEY MED SCH,CTR APPL MATH & STAT,NEWARK,NJ 07103. RP SCANDRETT, CL (reprint author), USN,POSTGRAD SCH,DEPT MATH,MONTEREY,CA 93940, USA. NR 14 TC 1 Z9 1 U1 0 U2 0 PU ACADEMIC PRESS INC JNL-COMP SUBSCRIPTIONS PI SAN DIEGO PA 525 B ST, STE 1900, SAN DIEGO, CA 92101-4495 SN 0021-9991 J9 J COMPUT PHYS JI J. Comput. Phys. PD APR PY 1994 VL 111 IS 2 BP 282 EP 290 DI 10.1006/jcph.1994.1064 PG 9 WC Computer Science, Interdisciplinary Applications; Physics, Mathematical SC Computer Science; Physics GA NK226 UT WOS:A1994NK22600009 ER PT J AU BICKNELLTASSIUS, RN THEIS, WM COLE, T HIGA, KT GROSHENS, TJ AF BICKNELLTASSIUS, RN THEIS, WM COLE, T HIGA, KT GROSHENS, TJ TI METALORGANIC MOLECULAR-BEAM EPITAXY DOPING OF II-VI COMPOUND SEMICONDUCTORS SO JOURNAL OF CRYSTAL GROWTH LA English DT Article; Proceedings Paper CT 6th International Conference on I-VI Compounds and Related Optoelectronic Materials CY SEP 13-17, 1993 CL NEWPORT, RI ID P-TYPE ZNSE; DIODES; GROWTH AB Site-selective metalorganic molecular beam epitaxy (MOMBE) is a new technique that shows much promise for the controlled substitutional doping of II-VI compound semiconductors. In the present work, initial results on the use of the site-selective doping are reported. The metalorganic compound [t-BuZnAs(t-Bu)2]2 which is employed in the present work is only one of a whole class of potential compounds in which a group II element is pre-bonded to a group V element. ZnSe epitaxial layers doped with this compound exhibit bright near edge luminescence that is dominated by acceptor-bound-exciton transitions. This indicates that the As contained in this designer dopant is incorporated on its proper subsitution site. C1 USN,CTR AIR WARFARE,DIV WEAP,RES DEPT,CHINA LAKE,CA 93555. NR 13 TC 2 Z9 2 U1 0 U2 0 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 APR PY 1994 VL 138 IS 1-4 BP 425 EP 429 DI 10.1016/0022-0248(94)90845-1 PG 5 WC Crystallography; Materials Science, Multidisciplinary; Physics, Applied SC Crystallography; Materials Science; Physics GA NN997 UT WOS:A1994NN99700077 ER PT J AU MEYER, JR REISINGER, AR HARRIS, KA YANKA, RW MOHNKERN, LM RAMMOHAN, LR AF MEYER, JR REISINGER, AR HARRIS, KA YANKA, RW MOHNKERN, LM RAMMOHAN, LR TI PHOTOLUMINESCENCE STUDY OF HGTE-HG0.9CD0.1TE SUPERLATTICES SO JOURNAL OF CRYSTAL GROWTH LA English DT Article; Proceedings Paper CT 6th International Conference on I-VI Compounds and Related Optoelectronic Materials CY SEP 13-17, 1993 CL NEWPORT, RI ID HGTE-CDTE SUPERLATTICES; MOLECULAR-BEAM EPITAXY; QUANTUM-WELL STRUCTURES; LIQUID-PHASE EPITAXY; LASER ACTION; ELECTRON; INTERFACES; TRANSPORT; GROWTH AB Infrared photoluminescence (PL) measurements have been performed on 17 [211]-oriented superlattices with energy gaps spanning the range 110-495 meV. The spectra for 7 different samples display double peaks, which are attributed to monolayer fluctuations in the average thickness of the quantum wells. The peak splittings vary systematically with PL energy gap (E(p)), and are accurately reproduced by orientation-dependent band structure calculations if the magnitude of the fluctuations is taken to be 1.5 monolayers. These data confirm that the low-temperature [211] growth produces islands with monolayer average smoothness over lateral dimensions of at least 500-1000 angstrom. Results are compared with earlier determinations of the interface roughness correlation length from magneto-transport measurements. In agreement with theoretical predictions, the decrease of dE(p)/dT with increasing E(p) is as rapid as that in the Hg1-xCdxTe alloy. C1 MARTIN MARIETTA ELECTR LAB,SYRACUSE,NY 13221. WORCESTER POLYTECH INST,WORCESTER,MA 01609. RP MEYER, JR (reprint author), USN,RES LAB,CODE 5613,WASHINGTON,DC 20375, USA. RI Ram-Mohan, Ramdas/C-5167-2012 NR 31 TC 6 Z9 6 U1 2 U2 3 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0022-0248 J9 J CRYST GROWTH JI J. Cryst. Growth PD APR PY 1994 VL 138 IS 1-4 BP 981 EP 987 DI 10.1016/0022-0248(94)90942-3 PG 7 WC Crystallography; Materials Science, Multidisciplinary; Physics, Applied SC Crystallography; Materials Science; Physics GA NN997 UT WOS:A1994NN99700174 ER PT J AU SNAIL, KA LU, ZP WEIMER, R HEBERLEIN, J PFENDER, E HANSSEN, LM AF SNAIL, KA LU, ZP WEIMER, R HEBERLEIN, J PFENDER, E HANSSEN, LM TI CONFIRMATION OF (113) FACETS ON DIAMOND GROWN BY CHEMICAL-VAPOR-DEPOSITION SO JOURNAL OF CRYSTAL GROWTH LA English DT Letter ID HIGH-TEMPERATURE AB Recent observations of {113} facets on diamond films grown epitaxially at high temperatures with a chemical vapor deposition (CVD) process have been confirmed. Cylinder growth experiments employing both oxygen-acetylene flames and a DC plasma torch show clear evidence of {113} facetting. These results lend additional support to the hypothesis that an earlier crystal growth theory developed for silicon CVD may also apply to diamond CVD. C1 UNIV MINNESOTA,DEPT MECH ENGN,MINNEAPOLIS,MN 55455. NATL INST STAND & TECHNOL,DIV RADIOMETR PHYS,GAITHERSBURG,MD 20899. RP SNAIL, KA (reprint author), USN,RES LAB,DIV OPT SCI,CODE 5622,WASHINGTON,DC 20375, USA. NR 10 TC 9 Z9 9 U1 0 U2 4 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 APR PY 1994 VL 137 IS 3-4 BP 676 EP 679 DI 10.1016/0022-0248(94)91014-6 PG 4 WC Crystallography; Materials Science, Multidisciplinary; Physics, Applied SC Crystallography; Materials Science; Physics GA NE892 UT WOS:A1994NE89200047 ER PT J AU BENNETT, BR DELALAMO, JA SINN, MT PEIRO, F CORNET, A ASPNES, DE AF BENNETT, BR DELALAMO, JA SINN, MT PEIRO, F CORNET, A ASPNES, DE TI ORIGIN OF OPTICAL ANISOTROPY IN STRAINED INXGA1-XAS/INP AND INYAL1-YAS/INP HETEROSTRUCTURES SO JOURNAL OF ELECTRONIC MATERIALS LA English DT Article DE ELLIPSOMETRY; HETEROSTRUCTURE; INP; OPTICAL ANISOTROPY (OA); REFLECTANCE DIFFERENCE SPECTROSCOPY ID REFLECTANCE-DIFFERENCE SPECTROSCOPY; MOLECULAR-BEAM EPITAXY; CHEMICAL VAPOR-DEPOSITION; LASER-LIGHT SCATTERING; INGAAS/GAAS HETEROSTRUCTURES; MISMATCHED INGAAS/INP; RELAXATION; LAYERS; GROWTH; SEMICONDUCTORS AB Optical anisotropy in mismatched InxGa1-xAs/InP and InyAl1-yAs/InP heterostructures has been investigated by variable azimuthal angle ellipsometry and reflectance difference spectroscopy. The two approaches are shown to yield strongly correlated results. A comparison to high resolution x-ray diffraction, transmission electron microscopy, and atomic force microscopy studies indicates that large optical anisotropies are associated with surface roughening that results from three-dimensional growth. Our findings demonstrate that fast and nondestructive measurements of optical anisotropy can provide important information about the growth mode and crystalline quality of strained epitaxial layers. C1 MIT,CAMBRIDGE,MA 02139. UNIV BARCELONA,E-08028 BARCELONA,SPAIN. N CAROLINA STATE UNIV,RALEIGH,NC 27695. RP BENNETT, BR (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. RI Bennett, Brian/A-8850-2008; Peiro, Francesca/N-4436-2014; OI Bennett, Brian/0000-0002-2437-4213; Peiro, Francesca/0000-0002-5697-0554; del Alamo, Jesus/0000-0003-4003-7863; Calveras, Cornet/0000-0002-8537-361X NR 34 TC 10 Z9 10 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 APR PY 1994 VL 23 IS 4 BP 423 EP 429 DI 10.1007/BF02671224 PG 7 WC Engineering, Electrical & Electronic; Materials Science, Multidisciplinary; Physics, Applied SC Engineering; Materials Science; Physics GA NE365 UT WOS:A1994NE36500010 ER PT J AU OCONNOR, RP DEMAYO, TJ ROAHEN, JO AF OCONNOR, RP DEMAYO, TJ ROAHEN, JO TI THE LATERAL RADIOGRAPH - AN AID TO LABIOLINGUAL POSITION DURING TREATMENT OF CALCIFIED ANTERIOR TEETH SO JOURNAL OF ENDODONTICS LA English DT Article AB A technique is described to obtain a lateral view of an anterior tooth using a regular periapical film. This procedure helps determine the relative labiolingual position of instruments during the nonsurgical treatment of calcified canals. No additional armamentarium is required other than what is used in the daily practice of endodontics. This technique has other applications as well. C1 USN,DENT CLIN,ORLANDO,FL. USN,SCH DENT,DEPT ENDODONT,BETHESDA,MD 20814. NR 4 TC 3 Z9 3 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 APR PY 1994 VL 20 IS 4 BP 183 EP 184 DI 10.1016/S0099-2399(06)80332-8 PG 2 WC Dentistry, Oral Surgery & Medicine SC Dentistry, Oral Surgery & Medicine GA ND251 UT WOS:A1994ND25100008 PM 8035159 ER PT J AU GANGULI, SB MITCHELL, HG PALMADESSO, PJ AF GANGULI, SB MITCHELL, HG PALMADESSO, PJ TI AURORAL PLASMA TRANSPORT PROCESSES IN THE PRESENCE OF KV POTENTIAL STRUCTURES SO JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS LA English DT Article ID ELECTRIC-FIELDS; PARTICLE; DISTRIBUTIONS; REGION; DRIVEN AB We have simulated plasma transport processes in the presence of a quasi-twodimensional current filament, that generated kV potential structure in the auroral region. The simulation consists of a set of one-dimensional flux tube simulations with different imposed time-dependent, field-aligned currents. The model uses the 16 moment system of equations and simultaneously solves coupled continuity and momentum equations and equations describing the transport along the magnetic field lines of parallel and perpendicular thermal energy and heat flows for each species. The lower end of the simulation is at an altitude of 800 km, in the collisional topside ionosphere, while the upper end is at 10R(E) in the magnetosphere. The plasma consists of hot electrons and protons of magnetospheric origin and low-energy electrons, protons, and oxygen ions of ionospheric origin. The dynamical interaction of the individual current filaments with ionospheric and magnetospheric plasma generates a potential structure in the horizontal direction and kilovolt field-aligned potential drops along the field lines. The side-by-side display exhibits the evolution of the implied potential structure in the horizontal direction. In the presence of this potential structure and parallel electric field the ionospheric plasma density is depleted and velocity is reduced, while density enhancement and increased velocity is observed in magnetospheric plasma. The ionospheric and magnetospheric electron temperatures increase below 2R(E) due to magnetic mirror force on converging geomagnetic field lines. The primary cross-field motion produced by the horizontal E field (E x B drift) is perpendicular to both of the significant spatial directions and is thus ignorable in this geometry. The effects of other cross-field drift processes are discussed. The simulation thus provides insight into the dynamical evolution of two-dimensional potential structures driven by an imposed finite width, field-aligned current profile. C1 NASA,GODDARD SPACE FLIGHT CTR,DIV SPACE DATA & COMP,GREENBELT,MD 20771. USN,RES LAB,DIV PLASMA PHYS,WASHINGTON,DC 20375. RP GANGULI, SB (reprint author), SCI APPLICAT INT CORP,DIV PLASMA PHYS,1710 GOODRIDGE DR,MCLEAN,VA 22102, USA. NR 21 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 APR 1 PY 1994 VL 99 IS A4 BP 5761 EP 5770 DI 10.1029/93JA02773 PG 10 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA NF580 UT WOS:A1994NF58000007 ER PT J AU MEIER, RR PICONE, JM AF MEIER, RR PICONE, JM TI RETRIEVAL OF ABSOLUTE THERMOSPHERIC CONCENTRATIONS FROM THE FAR UV DAYGLOW - AN APPLICATION OF DISCRETE INVERSE-THEORY SO JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS LA English DT Article ID 7320-A TWILIGHT AIRGLOW; ULTRAVIOLET DAYGLOW; PHOTOELECTRON FLUX; SOLAR EUV; AE-E; TEMPERATURE; EMISSION; ATMOSPHERE; RADIATION; PROFILES AB The photoelectron-excited far ultraviolet dayglow provides a means for remote sensing of N2, O, O2, and temperature in the terrestrial thermosphere. This paper describes a model based on the maximum likelihood method of nonlinear discrete inverse theory, which extracts information on the state of the thermosphere from limb scans of the dayglow. We show that concentrations between about 150 and (at least) 350 km can be retrieved to a high degree of accuracy and precision, independent of instrument absolute calibration. Also, the retrieved concentrations are not strongly sensitive to errors in the photoelectron excitation cross sections. The model will allow the routine development of climatological databases on the thermosphere from satellite remote sensing missions. 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 35 TC 47 Z9 48 U1 2 U2 8 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 APR 1 PY 1994 VL 99 IS A4 BP 6307 EP 6320 DI 10.1029/93JA02775 PG 14 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA NF580 UT WOS:A1994NF58000054 ER PT J AU WANG, YM SHEELEY, NR AF WANG, YM SHEELEY, NR TI GLOBAL EVOLUTION OF INTERPLANETARY SECTOR STRUCTURE, CORONAL HOLES, AND SOLAR-WIND STREAMS DURING 1976-1993 - STACKPLOT DISPLAYS BASED ON SOLAR MAGNETIC OBSERVATIONS SO JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS LA English DT Article ID HELIOSPHERIC CURRENT SHEET; SUNS POLAR FIELDS; ULYSSES MISSION; RIGID ROTATION; FLUX TRANSPORT; CYCLE; SPEED; STRENGTH; MODEL AB We use potential field calculations and solar magnetic observations during 1976-1993 to infer the evolution of interplanetary sector structure, coronal holes, and solar wind streams at heliographic latitudes ranging from 80-degreesS to 80-degrees-N. The results are presented in the form of stackplots, which show long-lived patterns that rotate quasi-rigidly at rates determined by the photospheric distribution of nonaxisymmetric magnetic flux. The fastest wind streams and their coronal hole sources form slowly rotating patterns near the poles just after sunspot maximum but migrate to lower latitudes and tend to rotate at near-equatorial rates as sunspot activity declines. RP WANG, YM (reprint author), USN,RES LAB,EO HULBURT CTR SPACE RES,WASHINGTON,DC 20375, USA. NR 44 TC 50 Z9 51 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 JI J. Geophys. Res-Space Phys. PD APR 1 PY 1994 VL 99 IS A4 BP 6597 EP 6608 DI 10.1029/93JA02105 PG 12 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA NF580 UT WOS:A1994NF58000077 ER PT J AU SMITH, KJ SKELTON, H LEDSKY, R NG, TH YEAGER, J WAGNER, K AF SMITH, KJ SKELTON, H LEDSKY, R NG, TH YEAGER, J WAGNER, K TI INCREASED DRUG-REACTIONS IN HIV-1+ PATIENTS - A POSSIBLE EXPLANATION-BASED ON PATTERNS OF IMMUNE DYSREGULATION SO JOURNAL OF INVESTIGATIVE DERMATOLOGY LA English DT Meeting Abstract C1 WALTER REED ARMY MED CTR,WALTER REED ARMY INST RES,WASHINGTON,DC 20307. ARMED FORCES INST PATHOL,BETHESDA,MD. USN,NATL MED CTR,DEPT DERMATOL,BETHESDA,MD. HENRY M JACKSON FDN,BETHESDA,MD. NR 0 TC 0 Z9 0 U1 0 U2 0 PU BLACKWELL SCIENCE INC PI CAMBRIDGE PA 238 MAIN ST, CAMBRIDGE, MA 02142 SN 0022-202X J9 J INVEST DERMATOL JI J. Invest. Dermatol. PD APR PY 1994 VL 102 IS 4 BP 543 EP 543 PG 1 WC Dermatology SC Dermatology GA NF406 UT WOS:A1994NF40600143 ER PT J AU WEST, RH BUKER, H FRIEBELE, EJ HENSCHEL, H LYONS, PB AF WEST, RH BUKER, H FRIEBELE, EJ HENSCHEL, H LYONS, PB TI THE USE OF OPTICAL-TIME DOMAIN REFLECTOMETERS TO MEASURE RADIATION-INDUCED LOSSES IN OPTICAL FIBERS SO JOURNAL OF LIGHTWAVE TECHNOLOGY LA English DT Article ID STEADY-STATE EXPOSURES; INDUCED ATTENUATION AB Fiber-optics exposed to ionising radiation suffer from induced transmission loss from which recovery can take place over periods up to years after exposure. Measurement of this behavior presents difficulties over the longer times, but is necessary to permit predictions of fiber behavior in applications where long-term exposure to ionising radiation is involved, as in reactor environments, medical applications, space or accelerator instrumentation. This paper presents a summary of a study by a number of laboratories of the NATO Panel IV, Research Study Group 12 Nuclear Effects Task Group into the suitability of the use of optical time domain reflectometry for these measurements. Results are shown which validate this approach when used according to recommended guidelines. C1 RES CTR,JULICH,GERMANY. USN,RES LAB,WASHINGTON,DC 20375. FRAUNHOFER INST NATURWISSENSCH TECH TRENDANALYSEN,EUSKIRCHEN,GERMANY. LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87544. RP WEST, RH (reprint author), ROYAL MIL COLL SCI,SWINDON SN6 8LA,WILTS,ENGLAND. NR 15 TC 8 Z9 8 U1 0 U2 4 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0733-8724 J9 J LIGHTWAVE TECHNOL JI J. Lightwave Technol. PD APR PY 1994 VL 12 IS 4 BP 614 EP 620 DI 10.1109/50.285354 PG 7 WC Engineering, Electrical & Electronic; Optics; Telecommunications SC Engineering; Optics; Telecommunications GA NP299 UT WOS:A1994NP29900006 ER PT J AU MALGHANI, MS SMITH, DY AF MALGHANI, MS SMITH, DY TI A THEORY OF THE MOLLWO-IVEY LAW FOR DEFECT ABSORPTION AND ITS CORRELATION TO THE STOKES SHIFT IN EMISSION SO JOURNAL OF LUMINESCENCE LA English DT Article; Proceedings Paper CT 1993 International Conference on Luminescence (ICL 93) CY AUG 09-13, 1993 CL UNIV CONNECTICUT, STORRS, CT SP UNIV CONNECTICUT, OPT SOC AMER, AMER PHYS SOC, IEEE, LASER & ELECTRO OPT SOC, INT UNION PURE & APPL PHYS, INT SCI FDN, UNIV CONNECTICUT RES FDN HO UNIV CONNECTICUT ID LATTICE-CONSTANT; ALKALI-HALIDES; CRYSTALS AB A Mollwo-Ivey power-law relation between host-crystal lattice parameter and absorption-band energy of defects in ionic solids implies a linear relation between defect radius and interionic separation. The Ivey exponent represents a generalized compressibility and is correlated to Stokes shifts as an approximate measure of relaxation. C1 UNIV VERMONT,DEPT PHYS,BURLINGTON,VT 05405. USN,RES LAB,WASHINGTON,DC 20375. NR 8 TC 0 Z9 0 U1 0 U2 2 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0022-2313 J9 J LUMIN JI J. Lumines. PD APR PY 1994 VL 60-1 BP 599 EP 602 DI 10.1016/0022-2313(94)90227-5 PG 4 WC Optics SC Optics GA NR361 UT WOS:A1994NR36100150 ER PT J AU CASTNER, EW CHANG, YJ MELINGER, JS MCMORROW, D AF CASTNER, EW CHANG, YJ MELINGER, JS MCMORROW, D TI FEMTOSECOND FOURIER-TRANSFORM SPECTROSCOPY OF LOW-FREQUENCY INTERMOLECULAR MOTIONS IN WEAKLY INTERACTING LIQUIDS SO JOURNAL OF LUMINESCENCE LA English DT Article; Proceedings Paper CT 1993 International Conference on Luminescence (ICL 93) CY AUG 09-13, 1993 CL UNIV CONNECTICUT, STORRS, CT SP UNIV CONNECTICUT, OPT SOC AMER, AMER PHYS SOC, IEEE, LASER & ELECTRO OPT SOC, INT UNION PURE & APPL PHYS, INT SCI FDN, UNIV CONNECTICUT RES FDN HO UNIV CONNECTICUT ID VIBRATIONAL MOTION; RAMAN-SCATTERING; DYNAMICS AB We present new results on the temperature-dependent collision-induced low-frequency Raman spectrum of the spherical top molecule CCl4, obtained using optical-heterodyne-detected, femtosecond Fourier-transform Raman-induced Kerr-effect spectroscopy. A spectral shift to lower frequencies with increasing temperatures has been observed. C1 USN,RES LAB,WASHINGTON,DC 20375. RP CASTNER, EW (reprint author), BROOKHAVEN NATL LAB,DEPT CHEM,UPTON,NY 11973, USA. NR 14 TC 17 Z9 17 U1 0 U2 2 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0022-2313 J9 J LUMIN JI J. Lumines. PD APR PY 1994 VL 60-1 BP 723 EP 726 DI 10.1016/0022-2313(94)90261-5 PG 4 WC Optics SC Optics GA NR361 UT WOS:A1994NR36100184 ER PT J AU SABLIK, MJ RILEY, LA BURKHARDT, GL KWUN, H CANNELL, PY WATTS, KT LANGMAN, RA AF SABLIK, MJ RILEY, LA BURKHARDT, GL KWUN, H CANNELL, PY WATTS, KT LANGMAN, RA TI MICROMAGNETIC MODEL FOR BIAXIAL STRESS EFFECTS ON MAGNETIC-PROPERTIES SO JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS LA English DT Article ID STEEL; HYSTERESIS AB A micromagnetic formulation has been developed for modeling the effect of biaxial stress on magnetoclastic processes in polycrystalline steels. The formulation uses a modified version of the Kashiwaya model for the effect of biaxal stress on magnetic properties and combines it with the Schneider-Cannell-Watts model for magnetoelastic processes in steels. In particular, the model involves use of an effective stress equal to one of the deviatoric (i.e. distortional) normal stress components, depending on whether the field is parallel to a tensile or compressive axis or to the third axis perpendicular to the plane of biaxial stress. Computer results are compared to experimental results on the effects of biaxial stress on magnetic properties in mild steel and in SAE-4130 steel. Good qualitative agreement is found in almost all cases, in that in going from one biaxial stress case to the next, the same kinds of changes are seen magnetically. C1 USN,CTR SURFACE WARFARE,ANNAPOLIS,MD 21402. UNIV TASMANIA,HOBART,TAS 7001,AUSTRALIA. RP SABLIK, MJ (reprint author), SW RES INST,PO DRAWER 28510,SAN ANTONIO,TX 78228, USA. OI Riley, Lewis/0000-0001-5921-7296 NR 24 TC 26 Z9 29 U1 0 U2 2 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0304-8853 J9 J MAGN MAGN MATER JI J. Magn. Magn. Mater. PD APR PY 1994 VL 132 IS 1-3 BP 131 EP 148 DI 10.1016/0304-8853(94)90307-7 PG 18 WC Materials Science, Multidisciplinary; Physics, Condensed Matter SC Materials Science; Physics GA NK942 UT WOS:A1994NK94200015 ER PT J AU KOSHY, A RICHARDS, AL ALMUFTI, S GROVER, S SHABRAWY, MA PACSA, A ALANEZI, AAH ALNAKIB, B BURANS, J CARL, M HYAMS, KC AF KOSHY, A RICHARDS, AL ALMUFTI, S GROVER, S SHABRAWY, MA PACSA, A ALANEZI, AAH ALNAKIB, B BURANS, J CARL, M HYAMS, KC TI ACUTE SPORADIC HEPATITIS-E IN KUWAIT SO JOURNAL OF MEDICAL VIROLOGY LA English DT Article DE ANTI-HEV IGM; TRAVEL TO INDIAN SUBCONTINENT; MIDDLE EAST ID NON-B-HEPATITIS; LINKED-IMMUNOSORBENT-ASSAY; EPIDEMIC NON-A; E VIRUS; OUTBREAK; ANTIBODIES; CHILDREN; INDIA AB Fifty-seven adult patients with acute hepatitis and 34 comparison patients without liver disease were evaluated using a newly developed Western blot assay for IgM antibody to hepatitis E virus. The mean age of patients with hepatitis was 32 years (range, 18-55 years); 88% were male. Among patients with acute hepatitis, hepatitis A (anti-HAV IgM positive) was diagnosed in two (4%), hepatitis B (anti-HBc IgM positive) in three (5%), and hepatitis E (anti-HEV IgM positive) in 34 (60%). One hepatitis patient had CMV IgM, another had EBV IgM, and 16 others (28%) were negative for all serologic markers of acute viral hepatitis. No patient with acute hepatitis A or B and none of the comparison patients without acute hepatitis had anti-HEV IgM. All but one case of acute hepatitis E were found among ex-patriates of Asian origin, and acute hepatitis E was associated significantly with recent travel to the Indian subcontinent. These data suggest that acute hepatitis E is common among foreign workers in Kuwait but that little HEV transmission is occurring directly in Kuwait. (C) 1994 Wiley-Liss, Inc. C1 USN,MED RES UNIT 2,JAKARTA,INDONESIA. AL AMIRI HOSP,THUNIYAN AL GHANIM GASTROENTEROL CTR,JAKARTA,INDONESIA. PUBL HLTH LAB,SAFAT,KUWAIT. INFECT DIS HOSP,SAFAT,KUWAIT. USN,MED RES INST,BETHESDA,MD 20814. RP KOSHY, A (reprint author), KUWAIT UNIV,FAC MED,POST BOX 24923,SAFAT 13110,KUWAIT. NR 20 TC 9 Z9 10 U1 0 U2 1 PU WILEY-LISS PI NEW YORK PA DIV JOHN WILEY & SONS INC 605 THIRD AVE, NEW YORK, NY 10158-0012 SN 0146-6615 J9 J MED VIROL JI J. Med. Virol. PD APR PY 1994 VL 42 IS 4 BP 405 EP 408 DI 10.1002/jmv.1890420413 PG 4 WC Virology SC Virology GA ND134 UT WOS:A1994ND13400012 PM 8046431 ER PT J AU HATTENDORF, JB AF HATTENDORF, JB TI THE INSATIABLE EARL - THE LIFE OF MONTAGU,JOHN, 4TH EARL-OF-SANDWICH - RODGER,NAM SO JOURNAL OF MILITARY HISTORY LA English DT Book Review RP HATTENDORF, JB (reprint author), USN WAR COLL,NEWPORT,RI, 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 1994 VL 58 IS 2 BP 322 EP 323 DI 10.2307/2944030 PG 2 WC History SC History GA NE443 UT WOS:A1994NE44300011 ER PT J AU WANG, MC NATION, WG ARMSTRONG, JB SIEGEL, HJ KIM, SD NICHOLS, MA GHERRITY, M AF WANG, MC NATION, WG ARMSTRONG, JB SIEGEL, HJ KIM, SD NICHOLS, MA GHERRITY, M TI MULTIPLE QUADRATIC-FORMS - A CASE-STUDY IN THE DESIGN OF DATA-PARALLEL ALGORITHMS SO JOURNAL OF PARALLEL AND DISTRIBUTED COMPUTING LA English DT Article ID MATRIX MULTIPLICATION; PROCESSING SYSTEMS; ARRAY; PERFORMANCE; ARCHITECTURE; HYPERCUBE; COMPUTER; NETWORKS; MACHINE; CUBE AB Data-parallel implementations of the computationally intensive task of solving multiple quadratic forms (MQFs) have been examined. Coupled and uncoupled parallel methods are investigated, where coupling relates to the degree of interaction among the processors. Also, the impact of partitioning a large MQF problem into smaller non-interacting subtasks is studied. Trade-offs among the implementations for various data-size/machine-size ratios are categorized in terms of complex arithmetic operation counts, communication overhead, and memory storage requirements. Furthermore, the impact on performance of the mode of parallelism used is considered, specifically, SIMD versus MIMD versus SIMD/MIMD mixed-mode. From the complexity analyses, it is shown that none of the algorithms presented in this paper is best for all data-size/machine-size ratios. Thus, to achieve scalability (i.e., good performance as the number of processors available in a machine increases), instead of using a single algorithm, the approach discussed is to have a set of algorithms from which the most appropriate algorithm or combination of algorithms is selected based on the ratio calculated from the scaled machine size. The analytical results have been verified by experiments on the MasPar MP-1 (SIMD), nCUBE 2 (MIMD), and PASM (mixed-mode) prototype. (C) 1994 Academic Press. Inc. C1 IBM CORP,DIV AS-400,ROCHESTER,MN 55901. PURDUE UNIV,SCH ELECT ENGN,PARALLEL PROC LAB,W LAFAYETTE,IN 47907. KWANGWOON UNIV,SEOUL,SOUTH KOREA. NCR CORP,SAN DIEGO,CA 92127. USN,CTR OCEAN SYST,SUPERCONCURRENCY RES TEAM,SAN DIEGO,CA 92152. RP WANG, MC (reprint author), CUNY QUEENS COLL,DEPT COMP SCI,65-30 KISSENA BLVD,FLUSHING,NY 11367, USA. NR 55 TC 4 Z9 4 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 0743-7315 J9 J PARALLEL DISTR COM JI J. Parallel Distrib. Comput. PD APR PY 1994 VL 21 IS 1 BP 124 EP 139 DI 10.1006/jpdc.1994.1046 PG 16 WC Computer Science, Theory & Methods SC Computer Science GA NH279 UT WOS:A1994NH27900010 ER PT J AU SELA, JG ANDERSON, PB NORTON, DW YOUNG, MA AF SELA, JG ANDERSON, PB NORTON, DW YOUNG, MA TI MASSIVE PARALLELIZATION OF NMCS SPECTRAL MODEL SO JOURNAL OF PARALLEL AND DISTRIBUTED COMPUTING LA English DT Article ID TRANSFORM METHOD AB This paper briefly describes the formulation of NMC's Spectral Model and the numerical methods used in its implementation. The various segments of the numerical algorithm are analyzed for suitability to a massively parallel architecture and a computer algorithm is designed for execution on a CM-200 computer. Special emphasis is placed on the production of a fast Legendre Transform and the minimization of interprocessor communication. Performance and scalability issues are presented. (C) 1994 Academic Press, Inc. C1 PRC INC,MCLEAN,VA 22102. KAMAN SCI CORP,ALEXANDRIA,VA 22303. USN,RES LAB,WASHINGTON,DC 20375. RP SELA, JG (reprint author), NATL METEOROL CTR,WASHINGTON,DC 20233, USA. NR 14 TC 2 Z9 2 U1 0 U2 0 PU ACADEMIC PRESS INC JNL-COMP SUBSCRIPTIONS PI SAN DIEGO PA 525 B ST, STE 1900, SAN DIEGO, CA 92101-4495 SN 0743-7315 J9 J PARALLEL DISTR COM JI J. Parallel Distrib. Comput. PD APR PY 1994 VL 21 IS 1 BP 140 EP 149 DI 10.1006/jpdc.1994.1047 PG 10 WC Computer Science, Theory & Methods SC Computer Science GA NH279 UT WOS:A1994NH27900011 ER PT J AU CUTLER, CW WASFY, MO GHAFFAR, K HOSNI, M LLOYD, DR AF CUTLER, CW WASFY, MO GHAFFAR, K HOSNI, M LLOYD, DR TI IMPAIRED BACTERICIDAL ACTIVITY OF PMN FROM 2 BROTHERS WITH NECROTIZING ULCERATIVE GINGIVO-PERIODONTITIS SO JOURNAL OF PERIODONTOLOGY LA English DT Article DE PERIODONTITIS; NECROTIZING ULCERATIVE PATHOGENESIS ID HUMAN POLYMORPHONUCLEAR LEUKOCYTES; PREPUBERTAL PERIODONTITIS; JUVENILE PERIODONTITIS; NEUTROPHIL FUNCTION; BACTERIOLOGY; DEFICIENCY; ETIOLOGY; PATIENT; MAC-1; LFA-1 AB THE PURPOSE OF THIS STUDY was to investigate the pathogenesis of necrotizing ulcerative gingivo-periodontitis (ANUP) diagnosed in two brothers, age 9 (ANUP1) and 14 (ANUP2) from rural Egypt. Complete blood count, differential and blood chemistry were within normal limits for both brothers and they were not malnourished. The phagocytosis and killing function of their polymorphonuclear leukocuytes (PMN) towards four bacterial species were assessed using a fluorochrome microassay. The selection of bacterial species was based on preliminary microbiological results in early onset periodontitis in Egypt. Fluorochrome-labeled Prevotella intermedia, Peptostreptococcus micros, Campylobacter rectus, and Porphyromonas gingivalis were pre-opsonized with ANUP serum and added to PMN from both ANUP patients, as well as PMN from three sex-matched and two sex-and age-matched healthy Egyptian control (CTL) subjects. We found significant depressions (P < 0.05) in PMN phagocytosis and killing of C. rectus and P. intermedia by ANUP1 and ANUP2, when compared to all CTL PMN. An assessment of the Gramnegative subgingival microflora present in both ANUP patients (in colony forming unit percent of total CFU recovered) (CFU %) revealed the presence of P. intermedia (ANUP1, 41.7 CFU %; ANUP2, 14.8 CFU %), Fusobacterium nucleatum (ANUP1, 3.6 CFU %; ANUP2, 48.1 CFU %), and Veillonella spp. (ANUP1, 18.2 CFU %; ANUP2, 18.5 CFU %). Spirochetes were also observed in cytocentrifuged, Gram-stained plaque from both ANUP patients. The predominant Gram-positive bacterial species recovered from both NUG1 and NUG2 was Streptococcus morbillorum. C1 UNIV TEXAS,DEPT STOMATOL,DENT BRANCH,HOUSTON,TX. USN,MED RES UNIT 3,CAIRO,EGYPT. CAIRO UNIV,FAC ORAL & DENT MED,CAIRO,EGYPT. FU NIDCR NIH HHS [DE00214] NR 44 TC 10 Z9 10 U1 0 U2 0 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 1994 VL 65 IS 4 BP 357 EP 363 PG 7 WC Dentistry, Oral Surgery & Medicine SC Dentistry, Oral Surgery & Medicine GA NG225 UT WOS:A1994NG22500011 PM 8195981 ER PT J AU OVERLAND, JE SPILLANE, MC HURLBURT, HE WALLCRAFT, AJ AF OVERLAND, JE SPILLANE, MC HURLBURT, HE WALLCRAFT, AJ TI A NUMERICAL STUDY OF THE CIRCULATION OF THE BERING SEA BASIN AND EXCHANGE WITH THE NORTH PACIFIC-OCEAN SO JOURNAL OF PHYSICAL OCEANOGRAPHY LA English DT Article ID ALASKAN STREAM; CURRENT SYSTEM; VARIABILITY; MODEL; SLOPE; EDDY AB A limited-area, primitive equation, three-layer hydrodynamic model, with realistic coastlines and bathymetry and 1/8-degrees resolution, is used to investigate the circulation of the Bering Sea basin and the adjacent North Pacific Ocean. The westward flowing Alaskan Stream to the south of the Aleutian Island chain is specified as a boundary condition at inflow and outflow ports with a constant throughput of 15 Sv (Sv = 1 X 10(6), m3 s-1). Atmospheric forcing is based on the Hellerrman and Rosenstein monthly climatological wind field. The model is spun up over 50 years and the statistics of the final decade are described. The general features of the model circulation as discussed below are consistent with available hydrographic and buoy drift observations. The model Alaskan Stream separates from the Aleutian Island chain near 175-degrees-E; beyond this point there is strong interannual variability associated with meandering and occasional eddy shedding along the northern arm of the western subarctic gyre. There is a generally cyclonic, but spatially complex and nonstationary, circulation within the Bering Sea basin, fed by inflow through the Aleutian passes; outflow is confined to Kamchatka Strait and varies seasonally, between 8.5 Sv in summer and 13 Sv in winter. A region of intense eddy activity lies west-northwest of Bowers Ridge. The model predicts seasonal reversals in the Bering slope current that are not clearly evident in the temporally sparse observational database. The numerical study demonstrates that flow instabilities contribute to substantial interannual variability in the circulation of the Bering Sea and adjacent northwest Pacific Ocean. C1 UNIV WASHINGTON,JOINT INST STUDY ATMOSPHERE & OCEAN,SEATTLE,WA 98195. USN,RES LAB,BAY ST LOUIS,MS. PLANNING SYST INC,SLIDELL,LA. RP OVERLAND, JE (reprint author), NOAA,PACIFIC MARINE ENVIRONM LAB,BIN C15700,BLDG 3,SAND POINT WAY NE,SEATTLE,WA 98115, USA. RI Spillane, Michael/I-7870-2015 OI Spillane, Michael/0000-0003-0794-5675 NR 40 TC 41 Z9 45 U1 0 U2 4 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 1994 VL 24 IS 4 BP 736 EP 758 DI 10.1175/1520-0485(1994)024<0736:ANSOTC>2.0.CO;2 PG 23 WC Oceanography SC Oceanography GA NG407 UT WOS:A1994NG40700002 ER PT J AU OSOFSKY, MS SOULEN, RJ WOLF, SA BROTO, JM RAKOTO, H OUSSET, JC COFFE, G ASKENAZY, S PARI, P BOZOVIC, I ECKSTEIN, JN VIRSHUP, GF AF OSOFSKY, MS SOULEN, RJ WOLF, SA BROTO, JM RAKOTO, H OUSSET, JC COFFE, G ASKENAZY, S PARI, P BOZOVIC, I ECKSTEIN, JN VIRSHUP, GF TI MEASUREMENTS OF H(C2)(T) IN BI-SR-CU-O SO JOURNAL OF SUPERCONDUCTIVITY LA English DT Article DE UPPER CRITICAL FIELD; BISRCUO; ANOMALOUS CRITICAL FIELD; H(C2)(T) ID UPPER CRITICAL-FIELD; HIGH-TEMPERATURE SUPERCONDUCTORS; HIGH MAGNETIC-FIELDS; SINGLE-CRYSTALS; CRITICAL FLUCTUATIONS; RESISTIVE TRANSITION; II SUPERCONDUCTORS; SM1.85CE0.15CUO4-Y; THERMODYNAMICS; SUPERLATTICES AB H(c2)(T) has been measured for thin BSCO films at temperatures down to 65 mK and pulsed fields up to 35 T. H(c2)(T) diverged anomalously as the temperature decreased. At the lowest temperature, it was five times that expected for a conventional superconductor. C1 SERV NATL DES CHAMPS MAGNET PULSES,F-31077 TOULOUSE,FRANCE. CTR ETUD SACLAY,SERV PHYS ETAT CONDENSE,BASSES TEMP LAB,F-91191 GIF SUR YVETTE,FRANCE. VARIAN ASSOCIATES INC,EDWARD L GINZTON RES CTR,PALO ALTO,CA 94304. RP OSOFSKY, MS (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. RI Wolf, Stuart/A-7513-2009; Osofsky, Michael/A-1050-2010 NR 54 TC 14 Z9 14 U1 0 U2 0 PU PLENUM PUBL CORP PI NEW YORK PA 233 SPRING ST, NEW YORK, NY 10013 SN 0896-1107 J9 J SUPERCOND JI J. Supercond. PD APR PY 1994 VL 7 IS 2 BP 279 EP 282 DI 10.1007/BF00724552 PG 4 WC Physics, Applied; Physics, Condensed Matter SC Physics GA NM851 UT WOS:A1994NM85100004 ER PT J AU LIEBENBERG, DH CIMA, MJ MCINTYRE, PC FRANCAVILLA, TL AF LIEBENBERG, DH CIMA, MJ MCINTYRE, PC FRANCAVILLA, TL TI ANGULAR-DEPENDENCE OF TRANSPORT CURRENT NEAR-CRITICAL AT FIELDS TO 4-T IN METALORGANIC THIN-FILMS SO JOURNAL OF SUPERCONDUCTIVITY LA English DT Article DE CRITICAL CURRENT; HIGH TEMPERATURE SUPERCONDUCTOR; THIN FILM; ANGULAR DEPENDENCE; MAGNETIC FIELD DEPENDENCE; YBCO; METALORGANIC PREPARATION ID TEMPERATURE SUPERCONDUCTING FILMS; MAGNETIC-FIELDS; CURRENT-DENSITY; DEPOSITION AB Values of the transport current have been obtained as a function of angle of the magnetic field to the plane of the thin film YBa2Cu3O7-d (YBCO) prepared by metalorganic deposition. Current flowed in the a, b planes at various angles to the applied magnetic fields to 4.2 T. Films with thicknesses near 350 nm were studied. For these thin films and H \\ c a secondary maximum is observed when J(c) > 1 MA/cm2. Near H \\ a, b a large increase in I(c) is observed, and the sharpness, field dependence, and field directional dependence is discussed. The response to currents above I(c) is determined and the fit to a power law V approximately I(n) shows a strong correlation between I(c) and n. C1 MIT,CERAM PROC LAB,CAMBRIDGE,MA 02139. USN,RES LAB,WASHINGTON,DC 20375. RP LIEBENBERG, DH (reprint author), OFF NAVAL RES,800 N QUINCY ST,ARLINGTON,VA 22217, USA. NR 16 TC 0 Z9 0 U1 0 U2 0 PU PLENUM PUBL CORP PI NEW YORK PA 233 SPRING ST, NEW YORK, NY 10013 SN 0896-1107 J9 J SUPERCOND JI J. Supercond. PD APR PY 1994 VL 7 IS 2 BP 303 EP 308 DI 10.1007/BF00724558 PG 6 WC Physics, Applied; Physics, Condensed Matter SC Physics GA NM851 UT WOS:A1994NM85100010 ER PT J AU KLEIN, N TELLMANN, N WOLF, SA KRESIN, VZ AF KLEIN, N TELLMANN, N WOLF, SA KRESIN, VZ TI MICROWAVE SURFACE IMPEDANCE OF YBA2CU3O7-X - S-WAVE VERSUS D-WAVE PAIRING SO JOURNAL OF SUPERCONDUCTIVITY LA English DT Article DE HIGH-TEMPERATURE SUPERCONDUCTIVITY; SURFACE IMPEDANCE; PAIRING STATE ID PENETRATION DEPTH MEASUREMENTS; THIN-FILMS; SUPERCONDUCTORS; LOSSES AB The low temperature behavior of the microwave surface resistance R(s) and the penetration provides information on the pairing state. Fully oxygenated films with low dc-resistivity in the normal state exhibit an exponential temperature dependence corresponding to values of the energy gap up to 10 meV. For oxygen deficient films a linear R(s)(T) was observed, similar to single crystals. This can be explained qualitatively by induced superconductivity in the copper-oxygen chains. C1 USN,RES LAB,WASHINGTON,DC 20375. LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. RP KLEIN, N (reprint author), FORSCHUNGSZENTRUM JULICH GMBH,INST FESTKORPERFORSCH,D-52425 JULICH,GERMANY. RI Wolf, Stuart/A-7513-2009; Klein, Norbert/C-1473-2017 NR 14 TC 15 Z9 15 U1 0 U2 0 PU PLENUM PUBL CORP PI NEW YORK PA 233 SPRING ST, NEW YORK, NY 10013 SN 0896-1107 J9 J SUPERCOND JI J. Supercond. PD APR PY 1994 VL 7 IS 2 BP 459 EP 461 DI 10.1007/BF00724589 PG 3 WC Physics, Applied; Physics, Condensed Matter SC Physics GA NM851 UT WOS:A1994NM85100041 ER PT J AU DENG, Y PARK, EK AF DENG, Y PARK, EK TI CHECKPOINTING AND ROLLBACK-RECOVERY ALGORITHMS IN DISTRIBUTED SYSTEMS SO JOURNAL OF SYSTEMS AND SOFTWARE LA English DT Article ID STATES AB To keep it free of arbitrary failures, a distributed system may require taking checkpoints from time to time. In case of failures, the system will roll back to check-points where global consistency is preserved. Based on the concept of global consistency defined in this article, which eliminates both received-not-sent and sent-not-received types of inconsistencies, we developed a synchronous checkpointing algorithm C* and an asynchronous roll back-recovering algorithm R* with O(VE) message complexity, which has a relatively small coefficient, where V is the number of processors and E is the number of communication links in the system. Neither incoming message logging nor message-number calculation is needed. Our algorithms work well in complicated situations such as communication loops involving a minimal number of processors. Because of the feature of instant crash recovery and the overall low time, space, and message complexities, these algorithms are most feasible in real-time applications where rapid rollback recovery is crucial. C1 UNIV CALIF LOS ANGELES,DEPT COMP SCI,LOS ANGELES,CA 90024. USN ACAD,DEPT COMP SCI,ANNAPOLIS,MD 21402. NR 14 TC 6 Z9 8 U1 0 U2 0 PU ELSEVIER SCIENCE INC PI NEW YORK PA 655 AVENUE OF THE AMERICAS, NEW YORK, NY 10010 SN 0164-1212 J9 J SYST SOFTWARE JI J. Syst. Softw. PD APR PY 1994 VL 25 IS 1 BP 59 EP 71 DI 10.1016/0164-1212(94)90057-4 PG 13 WC Computer Science, Software Engineering; Computer Science, Theory & Methods SC Computer Science GA ND029 UT WOS:A1994ND02900006 ER PT J AU MAKRIS, NC BERKSON, JM AF MAKRIS, NC BERKSON, JM TI LONG-RANGE BACKSCATTER FROM THE MID-ATLANTIC RIDGE SO JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA LA English DT Article AB Acoustic backscatter returns measured with a vertical source and horizontal receiving array are beamformed and charted to respective scattering sites on the western flank of the Mid-Atlantic Ridge (MAR). Well-defined patterns of high-level backscatter resembling bottom morphology occur within the direct path and at convergence zone ranges. Measured backscatter is compared with modeled two-way transmission loss using the wide-angle parabolic equation (PE) and high-resolution supporting bathymetry. The level of backscatter is found to be strongly dependent upon two-way transmission loss (TL). Specifically, TL selects prominent bathymetric features from which high backscatter is returned, with backscatter maxima corresponding to TL minima. Scattering strength estimated for the wide area surveyed shows low variance and relatively minimal spatial variation. Apparently, distinct scattering contributions are so well mixed in long-range backscatter, that dominant variations are generally due to propagation. These results indicate that it is possible to forecast the range and azimuth of prominent MAR backscatter returns simply by propagation modeling if high-resolution bathymetry is available. They also have led to the development of a new technique for ambiguity removal in reverberation data measured with a horizontal line array. The method takes advantage of environmental asymmetry provided by TL in highly range-dependent environments and does not require multiple measurements as do other existing methods. RP MAKRIS, NC (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 23 TC 20 Z9 20 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 APR PY 1994 VL 95 IS 4 BP 1865 EP 1881 DI 10.1121/1.408702 PG 17 WC Acoustics; Audiology & Speech-Language Pathology SC Acoustics; Audiology & Speech-Language Pathology GA NF019 UT WOS:A1994NF01900016 ER PT J AU DONSKOY, DM BLUE, JE AF DONSKOY, DM BLUE, JE TI A NEW CONCEPT OF A LOW-FREQUENCY UNDERWATER SOUND SOURCE SO JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA LA English DT Article AB A new concept of a low-frequency (< 1000-Hz) underwater sound source has been developed and tested. The oscillation of a rigid body and a means for converting the dipole oscillation of the body to monopole radiation are used in this source. The source can be powered with electric or linear motors or hydrodynamic exciters that convert tow or flow to vibration. To prove the concept, a small version of the electric motor powered source has been built and successfully tested. To extend the bandwidth of the source, the variable resonance frequency and multiresonances of the device are discussed. A gas spring with a frequency-dependent stiffness is employed for the multifrequency resonant source design. The source promises to be reliable, inexpensive, highly efficient, and powerful. C1 USN,RES LAB,UNDERWATER SOUND REFERENCE DETACHMENT,ORLANDO,FL 32856. RP DONSKOY, DM (reprint author), STEVENS INST TECHNOL,DAVIDSON LAB,CASTLE POINT,HOBOKEN,NJ 07030, USA. NR 10 TC 1 Z9 2 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 1994 VL 95 IS 4 BP 1977 EP 1982 DI 10.1121/1.408711 PG 6 WC Acoustics; Audiology & Speech-Language Pathology SC Acoustics; Audiology & Speech-Language Pathology GA NF019 UT WOS:A1994NF01900025 ER PT J AU CUSCHIERI, JM FEIT, D AF CUSCHIERI, JM FEIT, D TI A HYBRID NUMERICAL AND ANALYTICAL SOLUTION FOR THE GREENS-FUNCTION OF A FLUID-LOADED ELASTIC PLATE SO JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA LA English DT Article ID LINE-DRIVEN; TRANSFORM AB A fundamental problem in structural acoustics is the scattering or radiation of sound from a fluid-loaded plate with discontinuities. In calculating the response of the plate, as well as the radiated pressure field, the traditional approach has been to evaluate the transform representation of the response or radiated pressure solution using a contour integral. The contour integral evaluation of these representations is numerically inefficient when compared to an approach that utilizes an FFT algorithm to compute the inverse transform by a direct integration along the real wave-number axis. The latter approach however can run into problems because of the presence of singularities along the real wave-number axis. In previous work by other investigators, this problem has been overcome by artificially including structural damping in their formulations, which in some instances may obscure the true effects of the radiation damping. In the present work, a direct integration approach is used after first analytically extracting from the solution the pole-like contributions on or near the real axis, and thus removing the problem of the singularities. The results only represent the influence of the radiation damping. The Green's functions obtained in this way for the fluid-loaded plate are compared to results obtained by the other techniques. The resulting Green's functions can be used to solve for the radiation and scattering problems for inhomogeneous fluid-loaded plates. C1 USN,CTR SHIP WARFARE,DIV CARDEROCK,BETHESDA,MD 20084. RP CUSCHIERI, JM (reprint author), FLORIDA ATLANTIC UNIV,CTR ACOUST & VIBRAT,BOCA RATON,FL 33431, USA. NR 7 TC 19 Z9 19 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 APR PY 1994 VL 95 IS 4 BP 1998 EP 2005 DI 10.1121/1.408608 PG 8 WC Acoustics; Audiology & Speech-Language Pathology SC Acoustics; Audiology & Speech-Language Pathology GA NF019 UT WOS:A1994NF01900028 ER PT J AU CANDY, JV SULLIVAN, EJ AF CANDY, JV SULLIVAN, EJ TI MODEL-BASED PROCESSOR DESIGN FOR A SHALLOW-WATER OCEAN ACOUSTIC EXPERIMENT SO JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA LA English DT Article ID LOCALIZATION AB Model-based signal processing is a well-defined methodology enabling the inclusion of environmental (propagation) models, measurement (sensor arrays) models, and noise (shipping, measurement) models into a sophisticated processing algorithm. Depending on the class of model developed from the mathematical representation of the physical phenomenology, various processors can evolve. Here the design of a space-varying, nonstationary, model-based processor (MBP) is investigated and applied to the data from a well-controlled shallow water experiment performed at Hudson Canyon. This particular experiment is very attractive for the inaugural application of the MBP because it was performed in shallow water at low frequency requiring a small number of modes. In essence, the Hudson Canyon represents a well-known ocean environment, making it ideal for this investigation. In this shallow water application, a state-space representation of the normal-mode propagation model is used. The processor is designed such that it allows in situ recursive estimation of both the pressure-field and modal functions. It is shown that the MBP can be effectively utilized to ''validate'' the performance of the model on noisy ocean acoustic data. In fact, a set of processors is designed, one for each source range and the results are quite good-implying that the propagation model with measured parameters adequately represents the data. C1 USN,CTR UNDERSEA WARFARE,NEWPORT,RI 02841. RP CANDY, JV (reprint author), LAWRENCE LIVERMORE NATL LAB,POB 5504,LIVERMORE,CA 94550, USA. NR 36 TC 12 Z9 14 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 APR PY 1994 VL 95 IS 4 BP 2038 EP 2051 DI 10.1121/1.408667 PG 14 WC Acoustics; Audiology & Speech-Language Pathology SC Acoustics; Audiology & Speech-Language Pathology GA NF019 UT WOS:A1994NF01900033 ER PT J AU SEEM, DA ROWE, NC AF SEEM, DA ROWE, NC TI SHAPE CORRELATION OF LOW-FREQUENCY UNDERWATER SOUNDS SO JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA LA English DT Article ID BALAENOPTERA-PHYSALUS; FINBACK; WHALES AB Standard correlation methods work poorly for significantly distorted signals. Good examples are 1-to 50-Hz underwater sounds correlated across hundreds of kilometers to locate ships, earthquakes, and large marine mammals. Current correlation methods for these sounds require either laborious human examination of graphical displays or automatic checking of enormous numbers of combinations. This paper reports on a program for automatically recognizing, classifying, and correlating such signals in a more efficient, higher level way. Ideas from computer vision are used to describe overall sound shapes rather than their details. The program uses a blackboard architecture and a time-shift transform analogous to the Hough transform. In experiments, the program ran an estimated 250 times faster than a conventional correlation approach. The program identified 69% of apparent whale moans having marked sound distortions with distance (and 100% of earthquakes), but nonetheless was nearly perfect in correlating whale moans between hydrophones 340 km apart in the presence of noisy earthquakes. RP SEEM, DA (reprint author), USN,POSTGRAD SCH,DEPT COMP SCI,CODE CS RP,MONTEREY,CA 93943, USA. NR 11 TC 4 Z9 4 U1 0 U2 1 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0001-4966 J9 J ACOUST SOC AM JI J. Acoust. Soc. Am. PD APR PY 1994 VL 95 IS 4 BP 2099 EP 2103 DI 10.1121/1.408671 PG 5 WC Acoustics; Audiology & Speech-Language Pathology SC Acoustics; Audiology & Speech-Language Pathology GA NF019 UT WOS:A1994NF01900039 ER PT J AU SHIFLER, DA MORAN, PJ KRUGER, J AF SHIFLER, DA MORAN, PJ KRUGER, J TI THE EFFECTS OF WATER ON THE PASSIVE BEHAVIOR OF 1018 CARBON-STEEL IN ORGANIC SOLUTIONS SO JOURNAL OF THE ELECTROCHEMICAL SOCIETY LA English DT Article ID ANHYDROUS PROPYLENE CARBONATE; ELECTROCHEMICAL-BEHAVIOR; IRON; RADIOTRACER; MIXTURES; PLATINUM AB The passivation and breakdown behavior of 1018 carbon steel in propylene carbonate (PC) or dimethoxyethane (DME) mixtures with water and containing 0.5M LiAsF6 were studied. The behavior of the steel in the organic solvent/water mixtures was highly dependent on the organic solvent. The anodic polarization of carbon steel displayed active-passive behavior in 10-90 mole percent (m/o) PC/H2O mixtures and a tenuous degree of stability within the passive range. The anodic polarization of carbon steel displayed no active-passive behavior in 50-90 m/o DME/H2O mixtures and displayed active-passive behavior in 10-30 m/o DME/H2O mixtures. The steel was stable within the passive range of these DME/H2O solutions. The breakdown potential of the steel in DME/H2O mixtures is more electropositive than the oxidation potential of the DME solvent at all molar ratios. C1 USN ACAD,DEPT MECH ENGN,ANNAPOLIS,MD 21402. RP SHIFLER, DA (reprint author), JOHNS HOPKINS UNIV,DEPT MAT SCI & ENGN,BALTIMORE,MD 21218, USA. NR 30 TC 12 Z9 12 U1 0 U2 0 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 1994 VL 141 IS 4 BP 934 EP 939 DI 10.1149/1.2054860 PG 6 WC Electrochemistry; Materials Science, Coatings & Films SC Electrochemistry; Materials Science GA NF410 UT WOS:A1994NF41000021 ER PT J AU HULL, AJ AF HULL, AJ TI A TECHNIQUE TO MEASURE THE BREATHING WAVE SPEED IN A TOWED ARRAY SO JOURNAL OF VIBRATION AND ACOUSTICS-TRANSACTIONS OF THE ASME LA English DT Note AB A method is developed for measuring the breathing wave speed in a towed array. The front of the array is longitudinally vibrated, producing aft-traveling wave energy that is detected by measuring the transfer function of a hydrophone channel and a forward bulkhead-mounted accelerometer. The transfer function is composed of two distinct wave types: an extensional wave and a breathing wave. The breathing wavelengths are much shorter than the extensional wavelengths; therefore, the local minimum associated with the first breathing wave null across the hydrophone channel can be identified. Because the frequency at which this null occurs and the length of the hydrophone channel are known, the breathing wave speed can be calculated. RP HULL, AJ (reprint author), USN,NAVAL UNDERSEA WARFARE CTR,DEPT SUBMARINE SONAR,NEW LONDON,CT 06320, USA. NR 0 TC 1 Z9 1 U1 0 U2 0 PU ASME-AMER SOC MECHANICAL ENG PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 SN 1048-9002 J9 J VIB ACOUST JI J. Vib. Acoust.-Trans. ASME PD APR PY 1994 VL 116 IS 2 BP 243 EP 245 DI 10.1115/1.2930419 PG 3 WC Acoustics; Engineering, Mechanical; Mechanics SC Acoustics; Engineering; Mechanics GA NH645 UT WOS:A1994NH64500016 ER PT J AU CONSTANTINE, NT BANSAL, J ZHANG, X HYAMS, KC HAYES, C AF CONSTANTINE, NT BANSAL, J ZHANG, X HYAMS, KC HAYES, C TI ENHANCED CHEMILUMINESCENCE AS A MEANS OF INCREASING THE SENSITIVITY OF WESTERN-BLOT ASSAYS FOR HIV ANTIBODY SO JOURNAL OF VIROLOGICAL METHODS LA English DT Article DE HIV; SEROLOGIC ASSAY; WESTERN BLOT; CHEMILUMINESCENCE ID HUMAN-IMMUNODEFICIENCY-VIRUS; IMMUNOASSAY AB Chemiluminescence indicator systems offer several advantages for diagnostic assays and have been used successfully to increase the sensitivity of antibody and antigen assays. A technique of enhanced chemiluminescence (ECL) was applied as a replacement for routine chromogenic substrates on HTV-1 Western blots. The results indicated that the enhanced chemiluminescence detection system increased the sensitivity by greater than 10-fold over routine chromogenic indicator systems when testing diluted, reactive sera. When testing 9 seroconversion panels, the use of ECL indicated that early detection of HIV infection was elicited in six panels up to 31 days (average 11.4 days) prior to detection by routine FDA-licensed Western blots, and could be detected in all panels up to 43 days (average 18.8 days) prior to detection by in-house Western blots. In no case was the ECL Western blot system less sensitive than any of the chromogenic Western blots, and in several cases the maximum potential of the ECL system for early detection of antibody could not be determined. The ECL system was capable of detecting antibodies to envelope antigens at a 20-fold increase over chromogenic Western blots. The time of detection of seropositivity by the ECL Western blot was equal to that of most ELISAs in 5 panels and was 31 days earlier than ELISA in one panel. Permanent documentation of Western blot profiles was accomplished using a simple instamatic camera system capable of detecting the chemiluminescence signal, and blots could be re-probed using a second sample. It is concluded that the application of an enhanced chemiluminescence detection system for HIV Western blots can increase sensitivity, detect infection earlier than standard Western blots, and has the potential to resolve HIV-1 Western blot indeterminate results. C1 USN,MED RES INST,BETHESDA,MD. RP CONSTANTINE, NT (reprint author), UNIV MARYLAND,SCH MED,DEPT PATHOL,ROOM 7-58,MSTF,10 S PINE ST,BALTIMORE,MD 21201, USA. NR 27 TC 19 Z9 20 U1 2 U2 28 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0166-0934 J9 J VIROL METHODS JI J. Virol. Methods PD APR PY 1994 VL 47 IS 1-2 BP 153 EP 164 DI 10.1016/0166-0934(94)90074-4 PG 12 WC Biochemical Research Methods; Biotechnology & Applied Microbiology; Virology SC Biochemistry & Molecular Biology; Biotechnology & Applied Microbiology; Virology GA NJ953 UT WOS:A1994NJ95300014 PM 8051223 ER PT J AU GEER, RE STENGER, DA CHEN, MS CALVERT, JM SHASHIDHAR, R JEONG, YH PERSHAN, PS AF GEER, RE STENGER, DA CHEN, MS CALVERT, JM SHASHIDHAR, R JEONG, YH PERSHAN, PS TI X-RAY AND ELLIPSOMETRIC STUDIES OF SELF-ASSEMBLED MONOLAYERS OF FLUORINATED CHLOROSILANES SO LANGMUIR LA English DT Article ID ORGANIZED MOLECULAR ASSEMBLIES; STRUCTURAL CHARACTERIZATION; LANGMUIR-BLODGETT; ADSORBED FILMS; GOLD; SPECTROSCOPY; REACTIVITY; SILICON AB Results of X-ray and ellipsometric studies on self-assembled monolayer films of three fluorinated chlorosilanes are presented. By inferring an index of refraction, the monolayer thicknesses obtained from both these types of studies are self-consistent. The tilt of the molecules with respect to the layer normal is found to be strongly dependent on the functionality of (i.e. the number of chlorine atoms attached to) the terminal Si atom of the molecule. C1 USN,RES LAB,CTR BIOMOLEC SCI & ENGN,CODE 6900,WASHINGTON,DC 20375. HARVARD UNIV,DEPT APPL SCI,CAMBRIDGE,MA 02138. HARVARD UNIV,DEPT PHYS,CAMBRIDGE,MA 02138. NR 23 TC 42 Z9 43 U1 0 U2 5 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0743-7463 J9 LANGMUIR JI Langmuir PD APR PY 1994 VL 10 IS 4 BP 1171 EP 1176 DI 10.1021/la00016a034 PG 6 WC Chemistry, Multidisciplinary; Chemistry, Physical; Materials Science, Multidisciplinary SC Chemistry; Materials Science GA NH597 UT WOS:A1994NH59700035 ER PT J AU JOHNSON, RE AGARWALA, VS AF JOHNSON, RE AGARWALA, VS TI USING FLUORESCENT COMPOUNDS AS EARLY WARNING DETECTORS FOR CORROSION SO MATERIALS PERFORMANCE LA English DT Article AB Several compounds change their fluorescent behavior upon oxidation or reduction. These compounds have been investigated to determine the effects of temperature, pH, reduction conditions, and re-oxidation behavior on their fluorescence. They were incorporated into primer coatings for aluminum alloys and fluoresced if the coating was scratched and exposed to air and moisture and when aluminum ions formed as the alloy corroded. The fluorescent phenomena appear to have potential as early warning sensors for corrosion, Large surface areas of alloy material, such as aircraft surfaces, could be scanned with ultraviolet light to detect the fluorescence of these materials indicating possible corrosion sites. C1 USN,CTR AIR WARFARE,DIV AIRCRAFT,WARMINSTER,PA 18974. RP JOHNSON, RE (reprint author), LETOURNEAU UNIV,DEPT CHEM,POB 7001,LONGVIEW,TX 75607, USA. NR 5 TC 15 Z9 16 U1 2 U2 8 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 APR PY 1994 VL 33 IS 4 BP 25 EP 29 PG 5 WC Materials Science, Characterization & Testing SC Materials Science GA NF422 UT WOS:A1994NF42200005 ER PT J AU WAGNER, PA RAY, RI LITTLE, BJ TUCKER, WC AF WAGNER, PA RAY, RI LITTLE, BJ TUCKER, WC TI MICROBIOLOGICALLY INFLUENCED DEGRADATION OF FIBER-REINFORCED POLYMERIC COMPOSITES SO MATERIALS PERFORMANCE LA English DT Article AB Two fiber-reinforced polymer composites were examined for susceptibility to microbiologically influenced degradation. Composites, resins, and fibers were exposed to sulfur/iron-oxidizing, calcareous-depositing, ammonium-producing, hydrogen-producing, and sulfate-reducing bacteria (SRB) in batch culture. Surfaces were uniformly colonized by all physiological types of bacteria. Epoxy and vinyl ester neat resins, carbon fibers, and epoxy composites were not adversely affected by microbiological species. SRB degraded the organic surfactant on glass fibers and preferentially colonized fiber-vinyl ester interfaces. Hydrogen-producing bacteria appeared to disrupt bonding between fibers and vinyl ester resin and to penetrate the resin at the interface. C1 USN,CTR UNDERSEA WARFARE,NEWPORT,RI 02841. RP WAGNER, PA (reprint author), USN,RES LAB,BAY ST LOUIS,MS 39529, USA. NR 20 TC 5 Z9 5 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 APR PY 1994 VL 33 IS 4 BP 46 EP 49 PG 4 WC Materials Science, Characterization & Testing SC Materials Science GA NF422 UT WOS:A1994NF42200010 ER PT J AU MOTA, GF NELSON, ML KODRES, UR AF MOTA, GF NELSON, ML KODRES, UR TI OBJECT-ORIENTED DECOMPOSITION FOR DISTRIBUTED SYSTEMS SO MICROPROCESSING AND MICROPROGRAMMING LA English DT Article DE CONCURRENCY; DISTRIBUTED COMPUTING; OBJECT-ORIENTED PROGRAMMING; REAL-TIME SYSTEMS; TASK DISTRIBUTION AB Conventional object-oriented design methodologies lead to a hierarchy of classes, but do not suggest which classes/objects should be loaded on which processors in a distributed system. We present the Decomposition Cost Evaluation Model (DCEM) as an approach to this problem. DCEM brings the mapping problem to a higher level of abstraction where the question is which classes, rather than which tasks, should be loaded on which processors. To support these decisions we define communication and computation cost functions for objects, classes, and hierarchies. We then introduce Confined Space Search Decomposition (CSSD) which enhances parallel operations of applications utilizing a tree topology for the processor interconnection scheme. To reduce the penalties of load imbalance, we include a distributed dynamic load balancing heuristic called Object Reincarnation (OR) in which no additional communication costs are incurred. C1 BRAZILIAN NAVY,CDR,BR-21941150 RIO JANEIRO,BRAZIL. USAF,HQ USCINCPAC,CAMP HM SMITH,HI 96861. USN,POSTGRAD SCH,DEPT COMP SCI,MONTEREY,CA 93943. NR 17 TC 1 Z9 1 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0165-6074 J9 MICROPROC MICROPROG JI Microprocess. Microprogr. PD APR PY 1994 VL 40 IS 2-3 BP 91 EP 102 DI 10.1016/0165-6074(94)90078-7 PG 12 WC Computer Science, Hardware & Architecture SC Computer Science GA NK031 UT WOS:A1994NK03100002 ER PT J AU GRAY, GC HYAMS, KC WANG, SP GRAYSTON, JT AF GRAY, GC HYAMS, KC WANG, SP GRAYSTON, JT TI MYCOPLASMA-PNEUMONIAE AND CHLAMYDIA-PNEUMONIAE STRAIN TWAR INFECTIONS IN UNITED-STATES-MARINE-CORPS RECRUITS SO MILITARY MEDICINE LA English DT Article AB Paired sera from 208 healthy Marine Corps recruits undergoing 11 weeks of basic training in San Diego during 1989 were studied by complement fixation and microimmunofluorescence techniques for antibody to Mycoplasma pneumoniae and Chlamydia pneumoniae strain TWAR infections. Upon entering training, 52.7% and 64.4% of the recruits had evidence of prior infection with M. pneumoniae and C. pneumoniae, respectively. At the end of training, 5.9% of recruits had evidence of new infections with M. pneumoniae (4-fold antibody rise) and 3.8% had evidence for new infections with C. pneumoniae (4-fold antibody rise). Recruits with evidence of previous infection with C. pneumoniae had a lower relative odds of new infection during training with this agent (odds ratio = 0.07, 95% confidence interval 0.00-0.61). These data demonstrate that, like their counterparts in Scandinavia, U.S. military recruits also suffer from C. pneumoniae infections. Both M. pneumoniae and C. pneumoniae should be considered as potential causes of respiratory disease among U.S. military trainees. RP GRAY, GC (reprint author), USN,HLTH RES CTR,CLIN EPIDEMIOL BRANCH,BOX 85122,SAN DIEGO,CA 92186, USA. NR 0 TC 8 Z9 8 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 APR PY 1994 VL 159 IS 4 BP 292 EP 294 PG 3 WC Medicine, General & Internal SC General & Internal Medicine GA NX696 UT WOS:A1994NX69600011 PM 20058422 ER PT J AU KO, HS BARAN, RH AF KO, HS BARAN, RH TI SIGNAL DETECTABILITY ENHANCEMENT WITH AUTOASSOCIATIVE BACKPROPAGATION NETWORKS SO NEUROCOMPUTING LA English DT Article DE NEURAL NETWORK; BACKPROPAGATION; ADAPTIVE NOVELTY FILTER; AUTOASSOCIATIVE MEMORY; DETECTION ID MODEL AB Feedforward networks having a one-to-one correspondence between input and output units are readily trained using backpropagation to perform auto-associative mappings. A novelty filter is obtained by subtracting the network output from the input vector. Then the presentation of a 'familiar' pattern tends to evoke a null response; but any anomalous component is enhanced. This principle motivates the design of an Adaptive Novelty Filter (ANF) to enhance the detectability of weak signals added to a statistically stationary or slowly-varying noise background and to serve as a pre-processor to any device which performs signal detection, estimation, or classification. The ability of the ANF to enhance the detectability of weak signals in wideband ocean acoustic background was measured by comparing the signal-to-noise ratios out of two matched filter detectors one of which received the time series directly while the other received the output of the ANF. The resulting Detectability Enhancement Ratio (DER) was found to increase with the number of hidden units for the first several thousand iterations of the learning algorithm. Subsequent devolution of the network pushes the noise power lower but the DER likewise drops off. We explore the causes of this phenomenon by studying the internal behavior of the auto-associative network as it learns to reconstruct the input vectors as linear combinations of intrinsic basis vectors each of which is defined by the weights of connections fanning out from a single hidden unit to the output layer. C1 USN,CTR SURFACE WARFARE,DAHLGREN DIV,SILVER SPRING,MD 20903. NR 24 TC 2 Z9 2 U1 2 U2 2 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0925-2312 J9 NEUROCOMPUTING JI Neurocomputing PD APR PY 1994 VL 6 IS 2 BP 219 EP 236 DI 10.1016/0925-2312(94)90056-6 PG 18 WC Computer Science, Artificial Intelligence SC Computer Science GA NK067 UT WOS:A1994NK06700006 ER PT J AU BORGES, CF AF BORGES, CF TI ON A CLASS OF GAUSS-LIKE QUADRATURE-RULES SO NUMERISCHE MATHEMATIK LA English DT Article ID MODIFIED MOMENTS; ILLUMINATION AB We consider a problem that arises in the evaluation of computer graphics illumination models. In particular, there is a need to find a finite set of wavelengths at which the illumination model should be evaluated. The result of evaluating the illumination model at these points is a sampled representation of the spectral power density of light emanating from a point in the scene. These values are then used to determine the RGB coordinates of the light by evaluating three definite integrals, each with a common integrand (the SPD) and interval of integration but with distinct weight functions. We develop a method for selecting the sample wavelengths in an optimal manner. More abstractly, we examine the problem of numerically evaluating a set of m definite integrals taken with respect to distinct weight functions but related by a common integrand and interval of integration. It is shown that when m greater-than-or-equal-to 3 it is not efficient to use a set of m Gauss rules because valuable information is wasted. We go on to extend the notions used in Gaussian quadrature to find an optimal set of shared abcissas that maximize precision in a well-defined sense. The classical Gauss rules come out as the special case m = 1 and some analysis is given concerning the existence of these rules when m > 1. In particular, we give conditions on the weight functions that are sufficient to guarantee that the shared abcissas are real, distinct, and lie in the interval of integration. Finally. we examine some computational strategies for constructing these rules. RP BORGES, CF (reprint author), USN,POSTGRAD SCH,CODE MA BC,MONTEREY,CA 93943, USA. RI Borges, Carlos/E-3157-2010 NR 17 TC 11 Z9 11 U1 0 U2 0 PU SPRINGER VERLAG PI NEW YORK PA 175 FIFTH AVE, NEW YORK, NY 10010 SN 0029-599X J9 NUMER MATH JI Numer. Math. PD APR PY 1994 VL 67 IS 3 BP 271 EP 288 DI 10.1007/s002110050028 PG 18 WC Mathematics, Applied SC Mathematics GA NJ152 UT WOS:A1994NJ15200001 ER PT J AU SUN, Y LEONARD, JW CHIOU, RB AF SUN, Y LEONARD, JW CHIOU, RB TI SIMULATION OF UNSTEADY OCEANIC CABLE DEPLOYMENT BY DIRECT INTEGRATION WITH SUPPRESSION SO OCEAN ENGINEERING LA English DT Article AB An improved algorithm is developed for predicting the transient response of a system of serially connected cables and bodies during unsteady deployment from a surface vessel. The governing equations of a cable-body system are derived with dependent variables of cable velocities, direction cosines and tension magnitude to form a nonlinear combined initial-value and boundary-value problem. The problem is then solved by introducing a stable Newmark-like implicit integration scheme in time and by a direct integration method with suppression of extraneous erroneous solutions. Special boundary conditions simulating actively controlled payout and slack-cable/ocean-bottom contact boundary conditions are included in the present model. C1 USN,CIVIL ENGN LAB,PORT HUENEME,CA. RP SUN, Y (reprint author), UNIV CONNECTICUT,DEPT CIVIL ENGN,STORRS,CT 06269, USA. NR 22 TC 15 Z9 24 U1 0 U2 1 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0029-8018 J9 OCEAN ENG JI Ocean Eng. PD APR PY 1994 VL 21 IS 3 BP 243 EP 256 DI 10.1016/0029-8018(94)90001-9 PG 14 WC Engineering, Marine; Engineering, Civil; Engineering, Ocean; Oceanography SC Engineering; Oceanography GA NP151 UT WOS:A1994NP15100001 ER PT J AU ERICKSON, LC SMITH, WS BISWAS, AK CAMARCA, MA WAECKER, NJ AF ERICKSON, LC SMITH, WS BISWAS, AK CAMARCA, MA WAECKER, NJ TI STREPTOCOCCUS-PNEUMONIAE-INDUCED HEMOLYTIC-UREMIC SYNDROME - A CASE FOR EARLY DIAGNOSIS SO PEDIATRIC NEPHROLOGY LA English DT Note DE HEMOLYTIC UREMIC SYNDROME; STREPTOCOCCUS-PNEUMONIAE; PNEUMONIA AB Hemolytic uremic syndrome associated with infection by neuraminidase-producing Streptococcus pneumoniae usually presents with fulminant pneumonia and has a high mortality rate. Post-pneumococcal hemolytic uremic syndrome may occur earlier in life than classical hemolytic uremic syndrome. We describe an 18-month-old male with hemolytic uremic syndrome, S. pneumoniae pneumonia, and T-antigen activation characteristic of neuraminidase activity. We have summarized the features of this case and 11 previously reported children. As the use of blood products containing IgM may aggravate this disorder, early recognition of hemolytic uremic syndrome associated with S. pneumoniae neuraminidase production may lead to improved patient outcome through the judicious use of blood products. C1 USN HOSP,DEPT PEDIAT,SAN DIEGO,CA 92134. USN HOSP,DEPT PATHOL,SAN DIEGO,CA 92134. USN HOSP,DEPT CLIN INVEST,SAN DIEGO,CA 92134. NR 0 TC 39 Z9 43 U1 0 U2 0 PU SPRINGER VERLAG PI NEW YORK PA 175 FIFTH AVE, NEW YORK, NY 10010 SN 0931-041X J9 PEDIATR NEPHROL JI Pediatr. Nephrol. PD APR PY 1994 VL 8 IS 2 BP 211 EP 213 PG 3 WC Pediatrics; Urology & Nephrology SC Pediatrics; Urology & Nephrology GA NC629 UT WOS:A1994NC62900017 PM 8018501 ER PT J AU ASCHER, DP WAECKER, NJ OTTOLINI, MA RASZKA, WV MORIARTY, R ROBB, ML AF ASCHER, DP WAECKER, NJ OTTOLINI, MA RASZKA, WV MORIARTY, R ROBB, ML TI SIGNIFICANCE OF THE IMMUNE-COMPLEX DISSOCIATED (ICD) P24 ANTIGEN IN PEDIATRIC HIV-INFECTION SO PEDIATRIC RESEARCH LA English DT Meeting Abstract C1 WILFORD HALL USAF MED CTR, DEPT PEDIAT, LACKLAND AFB, TX 78236 USA. UNIFORMED SERV UNIV HLTH SCI, BETHESDA, MD 20814 USA. USN HOSP, BETHESDA, MD 20814 USA. NATL NAVAL MED CTR, BETHESDA, MD 20814 USA. WALTER REED ARMY INST RES, WASHINGTON, DC 20307 USA. 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 1994 VL 35 IS 4 BP A173 EP A173 PN 2 PG 1 WC Pediatrics SC Pediatrics GA NG779 UT WOS:A1994NG77901022 ER PT J AU FRY, EA AF FRY, EA TI DEVELOPING INTERACTIVE MULTIMEDIA MEDICAL-EDUCATION SOFTWARE WITHOUT PROGRAMMING - ILLUSTRATION WITH PEDIATRIC HIV SO PEDIATRIC RESEARCH LA English DT Meeting Abstract C1 USN,MED CTR,DEPT PEDIAT,SAN DIEGO,CA 92132. 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 1994 VL 35 IS 4 BP A142 EP A142 PN 2 PG 1 WC Pediatrics SC Pediatrics GA NG779 UT WOS:A1994NG77900837 ER PT J AU KEITH, JF PHIBBS, RH AF KEITH, JF PHIBBS, RH TI EFFECTS OF PHLEBOTOMY LOSSES ON TRANSFUSIONS IN PRETERM INFANTS TREATED WITH RECOMBINANT-HUMAN-ERYTHROPOIETIN SO PEDIATRIC RESEARCH LA English DT Meeting Abstract C1 UNIV CALIF SAN FRANCISCO,DEPT PEDIAT,SAN FRANCISCO,CA 94143. USN,MED CTR,SAN DIEGO,CA 92132. NR 0 TC 3 Z9 3 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 1994 VL 35 IS 4 BP A233 EP A233 PN 2 PG 1 WC Pediatrics SC Pediatrics GA NG779 UT WOS:A1994NG77901378 ER PT J AU OBRIEN, F AF OBRIEN, F TI A NONMETRIC MEASURE OF EUCLIDEAN DISTANCE SO PERCEPTUAL AND MOTOR SKILLS LA English DT Article ID FINITE POPULATIONS AB The results of a large scale simulation study to test the fundamental properties of the author's finite population spatial density model are reported. A conjecture is given relating metric distance to a nonmetric estimate in two-dimensional space. RP OBRIEN, F (reprint author), USN,DIV UNDERSEA AWRFARE CTR,CODE 2211,B 1171-1,1176 HOWELL ST,NEWPORT,RI 02841, USA. NR 2 TC 1 Z9 1 U1 0 U2 0 PU PERCEPTUAL MOTOR SKILLS PI MISSOULA PA PO BOX 9229, MISSOULA, MT 59807 SN 0031-5125 J9 PERCEPT MOTOR SKILL JI Percept. Mot. Skills PD APR PY 1994 VL 78 IS 2 BP 561 EP 562 PG 2 WC Psychology, Experimental SC Psychology GA NF049 UT WOS:A1994NF04900036 ER PT J AU SHURTLEFF, D THOMAS, JR SCHROT, J KOWALSKI, K HARFORD, R AF SHURTLEFF, D THOMAS, JR SCHROT, J KOWALSKI, K HARFORD, R TI TYROSINE REVERSES A COLD-INDUCED WORKING-MEMORY DEFICIT IN HUMANS SO PHARMACOLOGY BIOCHEMISTRY AND BEHAVIOR LA English DT Article DE COLD STRESS; TYROSINE; WORKING MEMORY; CATECHOLAMINES; MATCHING-TO-SAMPLE ID MESOCORTICAL DOPAMINE NEURONS; TO-SAMPLE PERFORMANCE; PREFRONTAL CORTEX; MODERATE COLD; ENVIRONMENTAL-STRESS; BRAIN NOREPINEPHRINE; AGED MONKEYS; RATS; CATECHOLAMINES; DEPRESSION AB Acute exposure to cold stress has been shown to impair short-term, or working, memory, which may be related to reduction in, or disruption of, sustained release of brain catecholamines. Administering a supplemental dose of the catecholamine precursor tyrosine may alleviate cold stress-induced memory impairments by preventing cold-induced deficits in brain catecholamine levels. The present experiment determined whether administration of tyrosine would prevent a cold-induced working memory deficit, using a computer-based delayed matching-to-sample (DMTS) memory task. Eight male volunteers performed the DMTS task for 30 min at an ambient temperature of either 4 degrees C (cold) or 22 degrees C following a 30-min preexposure period and 2 h after ingesting 150 mg/kg of L-tyrosine or placebo. Subjects demonstrated a decline in matching accuracy on the DMTS task as delay interval increased, such that matching accuracy following a 16-s delay between sample and comparison stimuli was lower than that following a delay of 2 or 8 s. Consistent with previous research, and relative to 22 degrees C exposure sessions, matching accuracy during 4 degrees C exposure sessions was reduced significantly following placebo administration, which is attributed to the effect of cold exposure on short-term, or working, memory. Administration of tyrosine significantly improved matching accuracy at the longest delay interval most affected by cold exposure, such that matching accuracy in the cold following tyrosine was at the same level as matching accuracy following placebo or tyrosine administration at 22 degrees C. Tyrosine administered prior to 22 degrees C exposure had no effect on DMTS performance. Plasma norepinephrine levels and diastolic and systolic blood pressure were significantly elevated just prior to performing the DMTS task and following 30 min of acute cold exposure, indicating that the cold exposure produced a typical stress response. Tyrosine was effective in protecting against the effects of cold stress on DMTS performance, possibly by preventing cold stress-induced reduction in brain catecholamine levels. RP SHURTLEFF, D (reprint author), USN,MED RES INST,THERMAL STRESS ADAPTAT PROGRAM,8901 WISCONSIN AVE,BETHESDA,MD 20889, USA. NR 37 TC 75 Z9 79 U1 1 U2 9 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0091-3057 J9 PHARMACOL BIOCHEM BE JI Pharmacol. Biochem. Behav. PD APR PY 1994 VL 47 IS 4 BP 935 EP 941 DI 10.1016/0091-3057(94)90299-2 PG 7 WC Behavioral Sciences; Neurosciences; Pharmacology & Pharmacy SC Behavioral Sciences; Neurosciences & Neurology; Pharmacology & Pharmacy GA NB496 UT WOS:A1994NB49600024 PM 8029265 ER PT J AU JIANG, H YUAN, T HOW, H WIDOM, A VITTORIA, C CHRISEY, D HORWITZ, J DREHMAN, A AF JIANG, H YUAN, T HOW, H WIDOM, A VITTORIA, C CHRISEY, D HORWITZ, J DREHMAN, A TI MEASUREMENTS OF SURFACE IMPEDANCE, LONDON PENETRATION DEPTH, AND COHERENCE LENGTH IN Y-BA-CU-O FILMS AT MICROWAVE-FREQUENCIES SO PHYSICAL REVIEW B LA English DT Article ID HIGH-TC SUPERCONDUCTORS; YBA2CU3O7 THIN-FILMS; RESONATOR TECHNIQUE; RESISTANCE; FIELD; ABSORPTION; CRYSTALS; VORTICES AB We have improved a microwave self-resonant technique to measure surface resistance R(s) directly and surface inductance L(s) indirectly. For films prepared by the laser ablation technique we observed that R(s) at 21 GHz decreased by about three orders of magnitude as the temperature decreased from 90 to 80 K reaching a low value of 4.9 X 10(-4) OMEGA. We measured the London penetration depth lambda and coherence length xi, and found that both lambda and xi are anisotropic. Their values depended on the direction of the microwave electric field relative to the c axis. We deduced the value of lambda(parallel-to)(0) to be about 1800 angstrom, lambda(parallel-to)(86.5) about 8000 angstrom, and lambda(perpendicular-to)(86.5) about 26000 angstrom, where lambda(parallel-to)(0) is the penetration depth (as T --> 0 K) for the electromagnetic electric field parallel and lambda(perpendicular-to) perpendicular to the film plane. In addition xi(parallel-to) was determined to be 129 angstrom and xi(perpendicular-to) equal to 40 angstrom at 86.5 K. The anisotropic factor gamma is about 3. C1 USN,RES LAB,WASHINGTON,DC 20375. ROME LAB,BEDFORD,MA 01731. RP JIANG, H (reprint author), NORTHEASTERN UNIV,BOSTON,MA 02115, USA. NR 35 TC 16 Z9 16 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD APR 1 PY 1994 VL 49 IS 14 BP 9924 EP 9932 DI 10.1103/PhysRevB.49.9924 PG 9 WC Physics, Condensed Matter SC Physics GA NG486 UT WOS:A1994NG48600071 ER PT J AU CANRIGHT, D AF CANRIGHT, D TI THERMOCAPILLARY FLOW NEAR A COLD-WALL SO PHYSICS OF FLUIDS LA English DT Article ID HIGH MARANGONI NUMBER; CONVECTION AB The thermocapillary feedback mechanism important at the edge of weld pools and other materials processes is examined through a model problem. A pool of liquid with a flat horizontal free surface is bounded on one side by a vertical solid wall, which is maintained at a cold temperature to unit depth, and at a warmer temperature below; far away the fluid is at the warmer temperature. Surface tension is a decreasing function of temperature, so that the surface thermal gradient drives flow toward the comer. When convection is vigorous, the flow compresses the thermal gradient which is driving the flow; this positive feedback results in small local length scales and high velocities near the comer. This problem is examined through a detailed scaling analysis and through numerical simulation for a range of parameters. The results show that for vigorous convection, the flow in the cold comer is locally determined. RP CANRIGHT, D (reprint author), USN,POSTGRAD SCH,DEPT MATH,CODE MA-CA,MONTEREY,CA 93943, USA. NR 10 TC 22 Z9 22 U1 0 U2 0 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 1070-6631 J9 PHYS FLUIDS JI Phys. Fluids PD APR PY 1994 VL 6 IS 4 BP 1415 EP 1424 DI 10.1063/1.868256 PG 10 WC Mechanics; Physics, Fluids & Plasmas SC Mechanics; Physics GA NB666 UT WOS:A1994NB66600002 ER PT J AU LI, CP KAILASANATH, K ORAN, ES AF LI, CP KAILASANATH, K ORAN, ES TI DETONATION STRUCTURES BEHIND OBLIQUE SHOCKS SO PHYSICS OF FLUIDS LA English DT Article ID DIMENSIONAL DETONATIONS; NUMERICAL SIMULATIONS; STRONG IGNITION; WAVES; WEAK AB Detonation structures generated by wedge-induced, oblique shocks in hydrogen-oxygen-nitrogen mixtures were investigated by time-dependent numerical simulations. The simulations show a multidimensional detonation structure consisting of the following elements: (1) a nonreactive, oblique shock, (2) an induction zone, (3) a set of deflagration waves, and (4) a ''reactive shock,'' in which the shock front is closely coupled with the energy release. In a wide range of flow and mixture conditions, this structure is stable and very resilient to disturbances in the flow. The entire detonation structure is steady on the wedge when the flow behind the structure is completely supersonic. If a part of the flow behind the structure is subsonic, the entire structure may become detached from the wedge and move upstream continuously. RP LI, CP (reprint author), USN,RES LAB,COMPUTAT PHYS & FLUID DYNAM LAB,WASHINGTON,DC 20375, USA. NR 48 TC 69 Z9 76 U1 0 U2 6 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 1070-6631 J9 PHYS FLUIDS JI Phys. Fluids PD APR PY 1994 VL 6 IS 4 BP 1600 EP 1611 DI 10.1063/1.868273 PG 12 WC Mechanics; Physics, Fluids & Plasmas SC Mechanics; Physics GA NB666 UT WOS:A1994NB66600020 ER PT J AU UHM, HS AF UHM, HS TI TRANSIENT-BEHAVIOR OF CAVITY EXCITATION DRIVEN BY A MODULATED ELECTRON-BEAM SO PHYSICS OF PLASMAS LA English DT Article ID GENERATION; POWER AB A theoretical model of cavity excitation driven by a modulated electron beam is developed in connection with application to relativistic klystron amplifiers. Based on an equivalent circuit representation of a cavity impedance, the equations which govern the phase and amplitude of the excitation voltage appearing on the cavity opening are obtained in terms of time t and current modulation strength. Several points are noteworthy from the theoretical analysis. First, amplitude and phase shift of the induced voltage indicate a damping oscillation, whose frequency is proportional to the mismatch \DELTAomega\ between the modulation frequency omega and the cavity resonance frequency omega0. Second, rise time of the cavity excitation amplitude decreases as the value of the frequency mismatch increases. Third, for a large value of the frequency mismatch \DELTAomega\, the power, transfer from the modulated beam to the cavity occurs at the beginning of the beam pulse. Finally, it is observed that the absolute amount of energy delivered from the beam to the cavity decreases drastically as the frequency mismatch increases. RP UHM, HS (reprint author), USN,CTR SURFACE WARFARE,10901 NEW HAMPSHIRE AVE,SILVER SPRING,MD 20903, USA. NR 7 TC 3 Z9 3 U1 0 U2 0 PU AMER INST PHYSICS PI MELVILLE PA CIRCULATION & FULFILLMENT DIV, 2 HUNTINGTON QUADRANGLE, STE 1 N O 1, MELVILLE, NY 11747-4501 USA SN 1070-664X J9 PHYS PLASMAS JI Phys. Plasmas PD APR PY 1994 VL 1 IS 4 BP 1040 EP 1045 DI 10.1063/1.870784 PG 6 WC Physics, Fluids & Plasmas SC Physics GA NE122 UT WOS:A1994NE12200025 ER PT J AU FREUND, HP JACKSON, RH PERSHING, DE TACCETTI, JM AF FREUND, HP JACKSON, RH PERSHING, DE TACCETTI, JM TI NONLINEAR-THEORY OF THE FREE-ELECTRON LASER-BASED UPON A COAXIAL HYBRID WIGGLER SO PHYSICS OF PLASMAS LA English DT Article ID 1ST OPERATION; MILLIMETER AB A three-dimensional nonlinear formulation of a free-electron laser based upon a coaxial hybrid iron (CHI) wiggler is described. The CHI wiggler is created by insertion of a central rod and an outer ring [composed of alternating ferrite and dielectric spacers in which the ferrite (dielectric) sparer on the central rod is opposite to the dielectric (ferrite) spacer on the outer ring] along the axis of a solenoidal. An analytic model of the CHI wiggler is developed which is in good agreement with the Poisson/Superfish group of codes. The free-electron laser (FEL) formulation is a slow-time-scale analysis of the interaction of an annular electron beam with the CHI wiggler in a coaxial waveguide. The electromagnetic field is represented as the superposition of the vacuum transverse electric (TE), transverse magnetic (TM), and transverse electromagnetic (TEM) modes of the waveguide, and a set of nonlinear second-order differential equations is derived for the amplitudes and phases of these modes. These equations are solved simultaneously with the three-dimensional Lorentz force equations for the combined magnetostatic and electromagnetic fields. An adiabatic taper is used to model the injection of the beam, and an amplitude taper is included for efficiency enhancement. Simulations are presented for K(a)-, K(u)- and W-band operation. Multimode operation is also studied. The results indicate that operation over a wide bandwidth is practical with the CHI wiggler, and that the bandwidth in the tapered-wiggler cases is comparable to that for a uniform wiggler. Therefore, relatively high field strengths can be achieved with the CHI wiggler at shorter wiggler periods than is possible in many other conventional wiggler designs. C1 SCI APPLICAT INT CORP,MCLEAN,VA 22102. MISSION RES CORP,NEWINGTON,VA 22122. UNIV MARYLAND,COLL PK,MD 20742. RP FREUND, HP (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 14 TC 31 Z9 33 U1 0 U2 0 PU AMER INST PHYSICS PI MELVILLE PA CIRCULATION & FULFILLMENT DIV, 2 HUNTINGTON QUADRANGLE, STE 1 N O 1, MELVILLE, NY 11747-4501 USA SN 1070-664X J9 PHYS PLASMAS JI Phys. Plasmas PD APR PY 1994 VL 1 IS 4 BP 1046 EP 1059 DI 10.1063/1.870785 PG 14 WC Physics, Fluids & Plasmas SC Physics GA NE122 UT WOS:A1994NE12200026 ER PT J AU MILLER, DL DOPPMAN, JL AF MILLER, DL DOPPMAN, JL TI LOCALIZATION OF ENDOCRINE TUMORS WITH RADIOLABELED OCTREOTIDE SO RADIOLOGY LA English DT Letter ID SOMATOSTATIN; DIAGNOSIS C1 USN,NATL MED CTR,DEPT RADIOL,BETHESDA,MD 20889. RP MILLER, DL (reprint author), NIH,WARREN GRANT MAGNUSON CLIN CTR,DEPT DIAGNOST RADIOL,BLDG 10,BETHESDA,MD 20892, USA. NR 5 TC 1 Z9 1 U1 0 U2 0 PU RADIOLOGICAL SOC NORTH AMER PI EASTON PA 20TH AND NORTHAMPTON STS, EASTON, PA 18042 SN 0033-8419 J9 RADIOLOGY JI Radiology PD APR PY 1994 VL 191 IS 1 BP 289 EP 290 PG 2 WC Radiology, Nuclear Medicine & Medical Imaging SC Radiology, Nuclear Medicine & Medical Imaging GA NB685 UT WOS:A1994NB68500061 PM 8166870 ER PT J AU PARK, MA CALLAHAN, JH AF PARK, MA CALLAHAN, JH TI AN INDUCTIVE DETECTOR FOR TIME-OF-FLIGHT MASS-SPECTROMETRY SO RAPID COMMUNICATIONS IN MASS SPECTROMETRY LA English DT Article ID ASSISTED LASER DESORPTION; SECONDARY-ELECTRON EMISSION; MICROCHANNEL PLATE; SPECTROSCOPY; IMPACT; IONS AB In this paper we describe the underlying principles of, and demonstrate some of the attributes of, an inductive detector for use in time-of-flight mass spectrometry. Unlike a microchannel plate detector, the detection efficiency of the inductive detector is not dependent on ion velocity. Also, the inductive detector cannot be saturated in the same manner as a microchannel plate detector. Because the inductive detector detects only charged species, the neutral species normally observed in linear time-of-flight matrix-assisted laser desorption/ionization spectra do not appear in spectra obtained with the inductive detector. Further, price and availability of the material needed to fabricate an inductive detector are virtually independent of detector size. Perhaps one of the most important features of the inductive detector is that it is a largely non-destructive detector. C1 USN,RES LAB,CHEM CODE 6110,WASHINGTON,DC 20375. NR 15 TC 25 Z9 25 U1 0 U2 4 PU JOHN WILEY & SONS LTD PI W SUSSEX PA BAFFINS LANE CHICHESTER, W SUSSEX, ENGLAND PO19 1UD SN 0951-4198 J9 RAPID COMMUN MASS SP JI Rapid Commun. Mass Spectrom. PD APR PY 1994 VL 8 IS 4 BP 317 EP 322 DI 10.1002/rcm.1290080407 PG 6 WC Chemistry, Analytical; Spectroscopy SC Chemistry; Spectroscopy GA NG976 UT WOS:A1994NG97600006 ER PT J AU JONES, TE MCGINNIS, WC BRIGGS, JS AF JONES, TE MCGINNIS, WC BRIGGS, JS TI COMPACT SUBSTRATE HEATER FOR USE IN AN OXIDIZING ATMOSPHERE SO REVIEW OF SCIENTIFIC INSTRUMENTS LA English DT Article ID THIN-FILM DEPOSITION AB A compact heater, designed for the deposition of thin films at high temperatures in an oxidizing atmosphere or in vacuum, is described. The heater, including an oxygen-resistant case and the attached substrate, can be loaded into a vacuum deposition chamber through a small-diameter load-lock port, and will operate in 0-1 atm of oxygen at temperatures up to at least 800-degrees-C. Heat is generated resistively, and the substrates are heated directly by thermal conduction. The heater was built specifically to heat substrates during the growth of high-temperature superconducting thin films. RP JONES, TE (reprint author), USN,COMMAND,CTR CONTROL & OCEAN SURVEILLANCE,DIV RDT&E,CODE 573,SAN DIEGO,CA 92152, USA. NR 12 TC 10 Z9 11 U1 0 U2 0 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0034-6748 J9 REV SCI INSTRUM JI Rev. Sci. Instrum. PD APR PY 1994 VL 65 IS 4 BP 977 EP 980 DI 10.1063/1.1144930 PN 1 PG 4 WC Instruments & Instrumentation; Physics, Applied SC Instruments & Instrumentation; Physics GA NG494 UT WOS:A1994NG49400032 ER PT J AU KIM, CC REEVES, ME OSOFSKY, MS SKELTON, EF LIEBENBERG, DH AF KIM, CC REEVES, ME OSOFSKY, MS SKELTON, EF LIEBENBERG, DH TI A SYSTEM FOR IN-SITU PRESSURE AND AC SUSCEPTIBILITY MEASUREMENTS USING THE DIAMOND-ANVIL CELL - T(C)(P) FOR HGBA2CUO4+DELTA SO REVIEW OF SCIENTIFIC INSTRUMENTS LA English DT Article ID TC; SUPERCONDUCTIVITY AB Substantial improvements have been made in the sensitivity of an ac susceptibility measurement system which determines the pressure dependence of the superconducting transition temperature, T(c)(P). The pressure, P, is determined near T(c) from the position of the R1 and R2 fluorescence peaks from ruby chips. The system was used to determine T(c)(P) for several high T(c) single crystals, but was not sufficiently sensitive to determine T(c)(P) of polycrystalline samples for HgBa2CuO4+delta. This motivated us to improve the sensitivity of our system. Other parts of the system and the data analysis procedures also have been improved. As a demonstration, T(c)(P) of HgBa2CuO4+delta polycrystal to 4 GPa is presented. The improvement of the system using the diamond anvil cell opens the possibility of measuring T(c) above 10 GPa and on smaller samples. C1 USN,RES LAB,MAT PHYS BRANCH,WASHINGTON,DC 20375. OFF NAVAL RES,ARLINGTON,VA 22217. RP KIM, CC (reprint author), USN,RES LAB,DYNAM SOLID BRANCH,WASHINGTON,DC 20375, USA. RI Osofsky, Michael/A-1050-2010 NR 22 TC 14 Z9 14 U1 2 U2 2 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0034-6748 J9 REV SCI INSTRUM JI Rev. Sci. Instrum. PD APR PY 1994 VL 65 IS 4 BP 992 EP 997 DI 10.1063/1.1144878 PN 1 PG 6 WC Instruments & Instrumentation; Physics, Applied SC Instruments & Instrumentation; Physics GA NG494 UT WOS:A1994NG49400035 ER PT J AU SWAMINATHAN, R WAGNER, DK AF SWAMINATHAN, R WAGNER, DK TI ON THE CONSECUTIVE-RETRIEVAL PROBLEM SO SIAM JOURNAL ON COMPUTING LA English DT Article DE CONSECUTIVE-RETRIEVAL PROPERTY; TREE REALIZATION; MATRIX DECOMPOSITION; POLYNOMIAL-TIME ALGORITHM ID PROPERTY AB A {0, 1}-matrix M has the consecutive-retrieval property if there exists a tree T such that the vertices of T are indexed on the rows of M and the columns of M are the incidence vectors of the vertex sets of paths of T. If such a T exists, then T is a realization for M. In this paper, an O(r2c) algorithm is presented to determine whether a given standard, r x c matrix has the consecutive-retrieval property and, if so, to construct a realization. C1 OFF NAVAL RES, DIV MATH SCI, ARLINGTON, VA 22217 USA. RP UNIV CINCINNATI, DEPT COMP SCI, CINCINNATI, OH 45221 USA. NR 25 TC 6 Z9 6 U1 0 U2 0 PU SIAM PUBLICATIONS PI PHILADELPHIA PA 3600 UNIV CITY SCIENCE CENTER, PHILADELPHIA, PA 19104-2688 USA SN 0097-5397 EI 1095-7111 J9 SIAM J COMPUT JI SIAM J. Comput. PD APR PY 1994 VL 23 IS 2 BP 398 EP 414 DI 10.1137/S0097539792235487 PG 17 WC Computer Science, Theory & Methods; Mathematics, Applied SC Computer Science; Mathematics GA ND339 UT WOS:A1994ND33900013 ER PT J AU CAMPBELL, PM SNOW, ES MCMARR, PJ AF CAMPBELL, PM SNOW, ES MCMARR, PJ TI FABRICATION OF NANOMETER-SCALE CONDUCTING SILICON WIRES WITH A SCANNING TUNNELING MICROSCOPE SO SOLID-STATE ELECTRONICS LA English DT Note CT 6th International Conference on Modulated Semiconductor Structures CY AUG 23-27, 1993 CL GARMISCH PARTENKIR, GERMANY SP TECH UNIV MUNCHEN, WALTER SCHOTTKY INST ID AIR AB We report the fabrication of nanometric-scale conducting silicon wires by the STM-induced modification of a passivated silicon (100) surface followed by a selective liquid etch. The modified surface layer is a thin oxide a few monolayers thick which acts as a mask against subsequent liquid etching of the unmodified regions of the silicon surface. Silicon wires as narrow as 30 nm have been fabricated with this technique. More complicated patterns can be written by selectivity pulsing the STM bias to a suitable writing voltage pixel-by-pixel during a low-bias (hence non-exposing) scan. The maximum pattern size is limited by the range of the piezoscanners, which for our system is in excess of 100 mum. Conducting silicon wires between contact pads were fabricated on a silicon layer on top of a buried insulating layer of SiO2 formed by oxygen implantation and subsequent anneal (SIMOX). Backgating of these structures can drive them either into accumulation or inversion, thus allowing independing control of their conductance and carrier type. The techniques described here allow the simple, easy, and reliable fabrication of nanometer-scale devices using relatively inexpensive and widely available equipment. RP CAMPBELL, PM (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 15 TC 19 Z9 19 U1 0 U2 0 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0038-1101 J9 SOLID STATE ELECTRON JI Solid-State Electron. PD APR-JUN PY 1994 VL 37 IS 4-6 BP 583 EP 586 DI 10.1016/0038-1101(94)90252-6 PG 4 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Condensed Matter SC Engineering; Physics GA NE796 UT WOS:A1994NE79600016 ER PT J AU BENNETT, BR SHANABROOK, BV WAGNER, RJ DAVIS, JL WATERMAN, JR TWIGG, ME AF BENNETT, BR SHANABROOK, BV WAGNER, RJ DAVIS, JL WATERMAN, JR TWIGG, ME TI INTERFACE COMPOSITION CONTROL IN INAS/GASB SUPERLATTICES SO SOLID-STATE ELECTRONICS LA English DT Article; Proceedings Paper CT 6th International Conference on Modulated Semiconductor Structures CY AUG 23-27, 1993 CL GARMISCH PARTENKIR, GERMANY SP TECH UNIV MUNCHEN, WALTER SCHOTTKY INST ID GA1-XINXSB/INAS SUPERLATTICES; INFRARED DETECTORS; RAMAN-SCATTERING; STOICHIOMETRY; GROWTH AB The GaSb/InAs materials system, with two species of both cations and anions, permits the construction of heterostructures with either InSb- or GaAs-like interfaces. As a result, this system provides an opportunity to explore the limits of interfacial control that can be achieved by vapor phase growth techniques. We have characterized a series of superlattices (SLs) prepared with both types of interfaces by X-ray diffraction, Raman spectroscopy, transmission electron microscopy and photoconductivity. The large differences in bond lengths, electronic properties and vibrational properties of InSb and GaAs interfaces allow these techniques to be sensitive probes of interfacial structure. By carefully measuring and minimizing the group V cross-contamination in the SL layers, we are able to unambiguously demonstrate the growth of SLs with almost pure InSb-like or GaAs-like interfaces. RP BENNETT, BR (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. RI Bennett, Brian/A-8850-2008 OI Bennett, Brian/0000-0002-2437-4213 NR 15 TC 17 Z9 17 U1 0 U2 0 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0038-1101 J9 SOLID STATE ELECTRON JI Solid-State Electron. PD APR-JUN PY 1994 VL 37 IS 4-6 BP 733 EP 737 DI 10.1016/0038-1101(94)90288-7 PG 5 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Condensed Matter SC Engineering; Physics GA NE796 UT WOS:A1994NE79600052 ER PT J AU KNIPP, PA REINECKE, TL AF KNIPP, PA REINECKE, TL TI ELECTRON-PHONON SCATTERING RATES IN QUANTUM WIRES SO SOLID-STATE ELECTRONICS LA English DT Article; Proceedings Paper CT 6th International Conference on Modulated Semiconductor Structures CY AUG 23-27, 1993 CL GARMISCH PARTENKIR, GERMANY SP TECH UNIV MUNCHEN, WALTER SCHOTTKY INST ID WELLS AB Electron-phonon scattering rates for quantum wires of arbitrary shapes are calculated rigorously within the dielectric continuum approach for the phonons. An integral equation approach is developed for the interface phonons, and the contribution to the scattering rates from the confined phonon modes are expressed in terms of the interface modes by a simple relation. Detailed results are given for the intrasubband and intersubband transition rates as functions of the electron energy and of the wire width for wires of rectangular cross section. The relative importance of the interface and confined phonons is discussed as a function of wire size. A quantitative appraisal is given of scattering rates obtained using simple separable approximations for the phonons. C1 USN,RES LAB,WASHINGTON,DC 20375. RP KNIPP, PA (reprint author), CHRISTOPHER NEWPORT UNIV,DEPT PHYS & COMP SCI,NEWPORT NEWS,VA 23606, USA. NR 11 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 0038-1101 J9 SOLID STATE ELECTRON JI Solid-State Electron. PD APR-JUN PY 1994 VL 37 IS 4-6 BP 1105 EP 1108 DI 10.1016/0038-1101(94)90365-4 PG 4 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Condensed Matter SC Engineering; Physics GA NE796 UT WOS:A1994NE79600129 ER PT J AU HOFFMAN, CA MEYER, JR YOUNGDALE, ER BARTOLI, FJ MILES, RH RAMMOHAN, LR AF HOFFMAN, CA MEYER, JR YOUNGDALE, ER BARTOLI, FJ MILES, RH RAMMOHAN, LR TI ELECTRON-TRANSPORT IN INAS/GA(1-X)IN(X)SB SUPERLATTICES SO SOLID-STATE ELECTRONICS LA English DT Article; Proceedings Paper CT 6th International Conference on Modulated Semiconductor Structures CY AUG 23-27, 1993 CL GARMISCH PARTENKIR, GERMANY SP TECH UNIV MUNCHEN, WALTER SCHOTTKY INST ID HGTE-CDTE SUPERLATTICES; INTERFACE ROUGHNESS SCATTERING; QUANTUM-WELLS; BAND-GAP; MAGNETOTRANSPORT AB We have experimentally investigated the electron transport properties of a series of n-type InAs/Ga1-xInxSb superlattices with InAs thicknesses (d1) between 25 and 86 angstrom and a fixed Ga1-xInxSb thickness (d2) of 25 angstrom. Interface roughness scattering is found to dominate the electron mobility (mu(n)), but with a much weaker dependence on layer thickness than the conventional d1(6). We observe an abrupt decrease in mu(n)(d1) at the semiconductor-to-semimetal transition point and the coexistence of two electron species in semimetallic samples. All of these findings can be understood by considering the theoretical band structures for InAs/Ga1-xInxSb superlattices with thin d2, which differ considerably from those in InAs/GaSb structures with comparable energy gaps and thick d2, but are strikingly similar to results for HgTe/CdTe. Since the system is strongly 3D rather than 2D in character, it is surprising that in some samples the quantum oscillations in the Hall conductivity are much larger than those in the diagonal conductivity. C1 HUGHES RES LABS,MALIBU,CA 90265. WORCESTER POLYTECH INST,WORCESTER,MA 01609. RP HOFFMAN, CA (reprint author), USN,RES LAB,CODE 5613,WASHINGTON,DC 20375, USA. RI Ram-Mohan, Ramdas/C-5167-2012 NR 16 TC 22 Z9 22 U1 0 U2 0 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0038-1101 J9 SOLID STATE ELECTRON JI Solid-State Electron. PD APR-JUN PY 1994 VL 37 IS 4-6 BP 1203 EP 1206 DI 10.1016/0038-1101(94)90389-1 PG 4 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Condensed Matter SC Engineering; Physics GA NE796 UT WOS:A1994NE79600153 ER PT J AU LOVE, RW AF LOVE, RW TI BATTLESHIP TEXAS - POWER,H SO SOUTHWESTERN HISTORICAL QUARTERLY LA English DT Book Review RP LOVE, RW (reprint author), USN ACAD,ANNAPOLIS,MD 21402, USA. NR 1 TC 0 Z9 0 U1 0 U2 0 PU TEXAS STATE HIST ASSN PI AUSTIN PA 2/306 RICHARDSON HALL UNIV STATION, AUSTIN, TX 78712 SN 0038-478X J9 SOUTHWEST HIST QUART JI Southw. Hist. Q. PD APR PY 1994 VL 97 IS 4 BP 709 EP 710 PG 2 WC History SC History GA NJ626 UT WOS:A1994NJ62600042 ER PT J AU JONKER, BT AF JONKER, BT TI SURFACE ADATOM ADATOM COORDINATION AND ORIENTATION DETERMINED BY LOW-ENERGY AUGER-ELECTRON AND PHOTOELECTRON DIFFRACTION DUE TO ADATOM EMISSION SO SURFACE SCIENCE LA English DT Letter ID X-RAY PHOTOELECTRON; ABSORPTION FINE-STRUCTURE; ANGULAR-DISTRIBUTIONS; MULTIPLE-SCATTERING; ATOMIC-STRUCTURE; SOURCE-WAVE; CU(001); GROWTH; CO; CRYSTALLOGRAPHY AB The Auger electron and photoelectron diffraction patterns due to surface adatom emission at low kinetic energies may be used to distinguish isolated adatoms, neighboring surface site occupation, the formation of adatom chains or clusters and their orientation relative to the substrate. The evolution of the diffraction pattern with neighboring site occupancy is discussed for Cu and Fe adatoms on Cu(001) within the context of the single scattering cluster approximation. The ability to detect short-range adatom coordination in the absence of long range order has direct applications for studies of surface diffusion, surface ordering and thin film growth. RP JONKER, BT (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 38 TC 3 Z9 3 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 APR 1 PY 1994 VL 306 IS 1-2 BP L555 EP L562 DI 10.1016/0039-6028(94)91177-0 PG 8 WC Chemistry, Physical; Physics, Condensed Matter SC Chemistry; Physics GA NE787 UT WOS:A1994NE78700008 ER PT J AU MALAFSKY, GP AF MALAFSKY, GP TI THE EFFECT OF SPUTTER TEMPERATURE ON VACANCY ISLAND BEHAVIOR ON NI(111) MEASURED BY PHOTOEMISSION OF ADSORBED XENON SO SURFACE SCIENCE LA English DT Letter ID ION-BOMBARDMENT; SURFACE-DEFECTS; PT(111); GROWTH; MECHANISMS; SIMULATION; ENERGY AB The temperature dependence of vacancy coalescence on an ion bombarded Ni(111) surface is measured by photoemission of adsorbed xenon (PAX). The Ni(111) crystal is sputtered by a low fluence (0.06 ML incident ions) Ar+ ion beam with incident kinetic energies of 500-3000 eV. The Xe coverage decreases rapidly with increasing temperature between 88 and 375 K with little additional change from 375 to 775 K. The PAX spectra are acquired with a Xe chamber pressure of 8 x 10(-10) Torr and at a temperature of 88 K. Under these conditions, the Xe is selectively adsorbed at defect sites which would make the Xe coverage proportional to the surface defect density on simple defect structures but the large size of the Xe atom relative to the Ni atom prevents the direct relationship of Xe coverage to the defect density when complex and varying defect structures are present. The decrease in Xe coverage is not attributed to the loss of defect sites by adatom-vacancy recombination but the changing vacancy island shape and size with temperature which alters the ratio of adsorbed Xe atoms to surface vacancy sites. This ratio decreases with increasing temperature as the vacancy islands progress from small and irregularly shaped islands to larger and hexagonally shaped islands. This transition is seen in Monte Carlo simulations of the kinetically driven atomic diffusion on the sputtered surface. RP MALAFSKY, GP (reprint author), USN,RES LAB,DIV CHEM,WASHINGTON,DC 20375, USA. NR 25 TC 4 Z9 4 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 APR 1 PY 1994 VL 306 IS 1-2 BP L539 EP L544 DI 10.1016/0039-6028(94)91174-6 PG 6 WC Chemistry, Physical; Physics, Condensed Matter SC Chemistry; Physics GA NE787 UT WOS:A1994NE78700005 ER PT J AU DACOL, DK AF DACOL, DK TI PATH-INTEGRAL SOLUTION OF THE TIME-DOMAIN PROGRESSIVE WAVE-EQUATION AND WAVE-PROPAGATION IN RANDOM-MEDIA SO WAVES IN RANDOM MEDIA LA English DT Article AB A time-domain progressive wave equation is derived from the usual linear acoustic wave equation, and it is shown that the solution to this new equation can be expressed as a Feynman path integral. This path integral representation is used to derive the time-dependent statistics of acoustic fields propagating through random media. RP DACOL, DK (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 0 TC 3 Z9 3 U1 0 U2 0 PU IOP PUBLISHING LTD PI BRISTOL PA TECHNO HOUSE, REDCLIFFE WAY, BRISTOL, ENGLAND BS1 6NX SN 0959-7174 J9 WAVE RANDOM MEDIA JI Waves Random Media PD APR PY 1994 VL 4 IS 2 BP 117 EP 126 DI 10.1088/0959-7174/4/2/002 PG 10 WC Physics, Multidisciplinary SC Physics GA NH161 UT WOS:A1994NH16100002 ER PT J AU PACE, MD BROWN, IM AF PACE, MD BROWN, IM TI H-2 ENDOR AND FTESEEM OF THE TANOLD SPIN-PROBE IN AN AMINE-CURED EPOXY MATRIX SO MACROMOLECULES LA English DT Article ID CORRELATION TIMES; ENVELOPE AB Fourier transforms of the electron spin echo envelope modulation (FTESEEM) patterns of deuterated TANOLD spin probes (4-hydroxy-2,2,6,6-piperidinyl-1-oxy-d17) in the amine-cured diglycidyl ether of bisphenol A epoxy (DGEBA) at room temperature show two pairs of deuterium lines displaced about the free deuterium frequency (2.2 MHz) which are assigned to the electron-nuclear hyperfine couplings of inequivalent -CD3 groups of the nitroxide. Conformational asymmetry of the -CD3 groups accounts for the experimentally observed two pairs of spectral lines at room temperature and the disappearance of one pair of lines at 100 K. In this model, it is suggested that two conformational states of the spin probe molecules are thermally populated as the temperature is increased from 100 K to room temperature. Continuous wave electron-nuclear double resonance (ENDOR) spectra support the FTESEEM results. Nuclear quadrupole interactions, as an alternative explanation for the observed splittings, are shown not to fully account for the experimental observations. C1 MCDONNELL DOUGLAS AEROSP E,ST LOUIS,MO 63166. RP PACE, MD (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 11 TC 2 Z9 2 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0024-9297 J9 MACROMOLECULES JI Macromolecules PD MAR 28 PY 1994 VL 27 IS 7 BP 1879 EP 1884 DI 10.1021/ma00085a033 PG 6 WC Polymer Science SC Polymer Science GA NE137 UT WOS:A1994NE13700033 ER PT J AU HUBA, JD AF HUBA, JD TI HALL DYNAMICS OF THE KELVIN-HELMHOLTZ INSTABILITY SO PHYSICAL REVIEW LETTERS LA English DT Article ID LARGE-LARMOR-RADIUS; MAGNETOPAUSE CURRENT LAYER; SIMULATION; BOUNDARY; PLASMA; IONOPAUSE; SYSTEMS; VENUS AB The nonlinear evolution of the Kelvin-Helmholtz instability in an inhomogeneous plasma is studied using a two-dimensional magnetohydrodynamic (MHD) simulation code which includes the Hall term. This term is important when the thickness of the boundary layer is less than an ion inertial length. In comparison to the evolution of the instability based upon ideal MHD, the Hall term generates short wavelength turbulence which inhibits vortex formation, and introduces an asymmetry into the nonlinear evolution of the instability depending upon the sign of the vorticity. RP HUBA, JD (reprint author), USN,RES LAB,DIV PLASMA PHYS,BEAM PHYS BRANCH,WASHINGTON,DC 20375, USA. NR 31 TC 40 Z9 40 U1 1 U2 3 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0031-9007 J9 PHYS REV LETT JI Phys. Rev. Lett. PD MAR 28 PY 1994 VL 72 IS 13 BP 2033 EP 2036 DI 10.1103/PhysRevLett.72.2033 PG 4 WC Physics, Multidisciplinary SC Physics GA ND600 UT WOS:A1994ND60000023 ER PT J AU BROWN, GG OLSON, MP AF BROWN, GG OLSON, MP TI DYNAMIC FACTORIZATION IN LARGE-SCALE OPTIMIZATION SO MATHEMATICAL PROGRAMMING LA English DT Article DE FACTORIZATION; LINEAR PROGRAMMING; GENERALIZED UPPER BOUNDS; PURE NETWORKS; GENERALIZED NETWORKS ID GENERALIZED NETWORKS; AUTOMATIC IDENTIFICATION; TRANSPORTATION; ALGORITHM; MODELS AB Factorization of linear programming (LP) models enables a large portion of the LP tableau to be represented implicitly and generated from the remaining explicit part. Dynamic factorization admits algebraic elements which change in dimension during the course of solution. A unifying mathematical framework for dynamic row factorization is presented with three algorithms which derive from different LP model row structures: generalized upper bound rows. pure network rows, and generalized network rows. Each of these structures is a generalization of its predecessors, and each corresponding algorithm exhibits just enough additional richness to accommodate the structure at hand within the unified framework. Implementation and computational results are presented for a variety of real-world models. These results suggest that each of these algorithms is superior to the traditional, non-factorized approach, with the degree of improvement depending upon the size and quality of the row factorization identified. RP BROWN, GG (reprint author), USN,POSTGRAD SCH,MONTEREY,CA 93943, USA. NR 73 TC 14 Z9 15 U1 0 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0025-5610 J9 MATH PROGRAM JI Math. Program. PD MAR 23 PY 1994 VL 64 IS 1 BP 17 EP 51 DI 10.1007/BF01582564 PG 35 WC Computer Science, Software Engineering; Operations Research & Management Science; Mathematics, Applied SC Computer Science; Operations Research & Management Science; Mathematics GA NP127 UT WOS:A1994NP12700002 ER PT J AU TSAI, TE FRIEBELE, EJ RAJARAM, M MUKHAPADHYAY, S AF TSAI, TE FRIEBELE, EJ RAJARAM, M MUKHAPADHYAY, S TI STRUCTURAL ORIGIN OF THE 5.16-EV OPTICAL-ABSORPTION BAND IN SILICA AND GE-DOPED SILICA SO APPLIED PHYSICS LETTERS LA English DT Article ID OXYGEN-DEFICIENT CENTERS; TWOFOLD COORDINATED SI; GLASSY SIO2; DEFECTS; LUMINESCENCE; VACANCY; ATOMS AB The origin of the 5.16 eV absorption band observed in silica and Ge-doped silica was studied using optical and electron spin resonance (ESR) measurements. The band was observed only in samples containing Ge, suggesting that it is related to the Ge impurity in silica, while a lack of correlation between the ESR intensity of the induced hydrogen-associated doublet and the absorption coefficient of the 5.16 eV band indicates that it is not related to two-coordinated Si or Ge. The observation of the absorption coefficient increased as the square root of the Ge concentration demonstrates that the 5.16 eV band is not related to two-coordinated Ge defects but that it is an oxygen deficiency center of the divacancy type associated with Ge. C1 GE CO,DIV QUARTZ PROD,RICHMOND HTS,OH 44143. VIRGINIA POLYTECH INST & STATE UNIV,BLACKSBURG,VA 24061. RP TSAI, TE (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 20 TC 35 Z9 36 U1 2 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 MAR 21 PY 1994 VL 64 IS 12 BP 1481 EP 1483 DI 10.1063/1.111891 PG 3 WC Physics, Applied SC Physics GA NB639 UT WOS:A1994NB63900007 ER PT J AU HAFTEL, MI ROSEN, M FRANKLIN, T HETTERMANN, M AF HAFTEL, MI ROSEN, M FRANKLIN, T HETTERMANN, M TI MOLECULAR-DYNAMICS OBSERVATIONS OF INTERDIFFUSION AND STRANSKI-KRASTANOV GROWTH IN THE EARLY FILM DEPOSITION OF AU ON AG(110) SO PHYSICAL REVIEW LETTERS LA English DT Article ID EMBEDDED-ATOM-METHOD; 100 CRYSTAL FACES; SURFACE RECONSTRUCTIONS; METALS; RELAXATIONS; PLATINUM; IRIDIUM; MODEL; GOLD; FCC AB We simulate the vapor deposition of the first three monolayers of Au on Ag(110) with the molecular dynamics code DAMSEL using surface-embedded-atom potentials and utilizing simulated annealing. The simulations show interdiffusive Stranski-Krastanov growth, which is consistent with recent ion scattering and scanning tunneling microscopy studies. Most of the first deposited monolayer of Au burrows to the substrate layer, with further deposition leading to 3D growth resembling a 3 x 1 missing-row reconstruction. We discuss the dynamic mechanisms accounting for this growth. RP HAFTEL, MI (reprint author), USN,RES LAB,CODE 6651,WASHINGTON,DC 20375, USA. NR 21 TC 35 Z9 35 U1 1 U2 4 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0031-9007 J9 PHYS REV LETT JI Phys. Rev. Lett. PD MAR 21 PY 1994 VL 72 IS 12 BP 1858 EP 1861 DI 10.1103/PhysRevLett.72.1858 PG 4 WC Physics, Multidisciplinary SC Physics GA NB622 UT WOS:A1994NB62200021 ER PT J AU VRBA, FJ LUGINBUHL, CB HARTMANN, DH HUDEC, R CHAFFEE, FH FOLTZ, CB HURLEY, KC AF VRBA, FJ LUGINBUHL, CB HARTMANN, DH HUDEC, R CHAFFEE, FH FOLTZ, CB HURLEY, KC TI OBSERVATIONAL EVIDENCE LINKING A QUASAR WITH AN OPTICAL TRANSIENT SO ASTROPHYSICAL JOURNAL LA English DT Article DE QUASARS; GENERAL ID GAMMA-RAY BURSTS; NEUTRON-STAR; COUNTERPARTS; QSOS; CANDIDATES; EVOLUTION; TELESCOPE; BLAZARS; OBJECTS; 3C-279 AB We present evidence for the association of a QSO with a bright optical transient (OT). A V = 20.6 mag QSO with redshift z = 1.78 has been found within the 38'' x 62'' error ellipse of a bright OT discovered on a Harvard Patrol Camera plate taken in 1905. The chance of finding a random QSO at V less-than-or-equal-to 20.6 mag within this area is estimated as approximately 0.5%. Although the OT is within the error circle of the gamma-ray burst (GRB) GB 910219 position determined from the WATCH experiment, the localization for this same event determined from the Third Interplanetary Network does not include the OT or the QSO. Whether the GRB is related to the OT/QSO or not, the probable association of a bright OT with a QSO is a discovery that warrants further investigation. C1 CLEMSON UNIV,DEPT PHYS & ASTRON,CLEMSON,SC 29634. ASTRON INST ONDREJOV,CS-25165 ONDREJOV,CZECHOSLOVAKIA. UNIV ARIZONA,MULTIPLE MIRROR TELESCOPE OBSERV,TUCSON,AZ 85721. UNIV CALIF BERKELEY,SPACE SCI LAB,BERKELEY,CA 94720. RP VRBA, FJ (reprint author), USN OBSERV,FLAGSTAFF STN,POB 1149,FLAGSTAFF,AZ 86002, USA. RI Hudec, Rene/G-9018-2014 NR 60 TC 8 Z9 8 U1 0 U2 0 PU UNIV CHICAGO PRESS PI CHICAGO PA 5720 S WOODLAWN AVE, CHICAGO, IL 60637 SN 0004-637X J9 ASTROPHYS J JI Astrophys. J. PD MAR 20 PY 1994 VL 424 IS 1 BP 68 EP 75 DI 10.1086/173872 PN 1 PG 8 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA NA499 UT WOS:A1994NA49900006 ER PT J AU LEISING, MD SHARE, GH AF LEISING, MD SHARE, GH TI GAMMA-RAY LIMITS ON GALACTIC FE-60 AND TI-44 NUCLEOSYNTHESIS SO ASTROPHYSICAL JOURNAL LA English DT Article DE DIFFUSE RADIATION; GAMMA RAYS, OBSERVATIONS; ISM, ABUNDANCES; NUCLEAR REACTIONS, NUCLEOSYNTHESIS, ABUNDANCES; SUPERNOVAE, GENERAL ID AL-26; SPECTROMETER; SUPERNOVAE; SN-1987A; HEAO-3; G25.5+0.2; RADIATION; SPECTRUM; MODELS; SOLAR AB We have searched nearly 10 years of data from NASA's Solar Maximum Mission (SMM) Gamma-Ray Spectrometer for evidence of gamma-ray line emission from the decay of the shorter lived daughters, Co-60 and Sc-44, of nucleosynthetic Fe-60 and Ti-44. The data are compared with models of the expected signals from the annual scan of the ecliptic by SMM. These models include (1) the extended diffuse emission from the many supernovae which should contribute Fe-60 over its 2.2 Myr lifetime, and (2) point sources at various locations in the Galactic plane which could be previously undiscovered remnants of supernovae which ejected Ti-44 We find no evidence of Galactic emission from either nucleus; upper limits (99% confidence) are near 8 x 10(-5) photons cm-2 s-1, for both the 1.17 MeV line from Co-60 decay integrated over the central radian of Galactic longitude and for the 1.16 MeV line from Sc-44 from points near the Galactic center. The limits on 1.16 MeV flux from longitudes near +/- 90-degrees rise to approximately 2 x 10(-4) photons cm-2 s-1 because the large angular distance to the ecliptic reduces the sensitivity in those directions. The mass of Fe-60 in the interstellar medium today is constrained to be less than 1.7 M.. This sets a limit on the current Galactic production rate of Fe-60 and of other isotopes coproduced with it, for example, Ca-48 and Ti-44. Estimating the current production of these stable isotopes from their solar abundances suggests that there should be about 0.9 M. of Fe-60 in the interstellar medium and indicates that Fe-60 could soon be detected with a slightly more sensitive instrument. Comparing the estimated production rates of stable isotopes with the gamma-ray limits on those of radioactive isotopes allows us to constrain some models of Galactic chemical evolution. The mass of Ti-44 at the Galactic center, for example, is (99% confidence) less than 8 x 10(-5) M.. This is a quite improbable result viewed in either of two ways. Employing plausible models of Galactic chemical evolution constrained to produce the solar concentration of Ca-44 in the Galaxy 4.5 Gyr ago suggests that Ca-44 is produced today at the rate (3-4) x 10(-4) M. per century. This production rate is consistent with our measurement at 5% confidence only for supernova rates less than 4.5 per century, depending slightly on the actual Ti-44 lifetime, and assuming all Ca-44 is ejected as Ti-44. Lower rates are consistent with our data, because the implied interval with no supernovae is not so unlikely, but the required higher yields of Ti-44 begin to strain current supernova nucleosynthesis calculations. Apart from the solar abundance requirement, we can check the consistency of any combination of supernova rate and Ti-44 yield. A Galactic supernova rate of three per century and a yield 10(-4) M. of Ti-44 per event, both very reasonable estimates, are consistent with our data at only 5% confidence. Perhaps the typical yield of frequent supernovae is significantly smaller than this, and the source of most Ca-44 is a rare type of high-yield event which has not occurred recently. The isotope Ti-44 is probably not a major contributor to interstellar positions. C1 USN,RES LAB,WASHINGTON,DC 20375. RP LEISING, MD (reprint author), CLEMSON UNIV,DEPT PHYS & ASTRON,CLEMSON,SC 29634, USA. NR 44 TC 30 Z9 30 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 20 PY 1994 VL 424 IS 1 BP 200 EP 207 DI 10.1086/173883 PN 1 PG 8 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA NA499 UT WOS:A1994NA49900017 ER PT J AU FELDMAN, U SEELY, JF DOSCHEK, GA STRONG, KT ACTON, LW UCHIDA, Y TSUNETA, S AF FELDMAN, U SEELY, JF DOSCHEK, GA STRONG, KT ACTON, LW UCHIDA, Y TSUNETA, S TI THE MORPHOLOGY OF THE 10(7)-K PLASMA IN SOLAR-FLARES .1. NONIMPULSIVE FLARES SO ASTROPHYSICAL JOURNAL LA English DT Article DE SUN, FLARES; SUN, X-RAYS, GAMMA RAYS ID X-RAY TELESCOPE; GENERAL SPECTRAL PROPERTIES; CHROMOSPHERIC EVAPORATION; NUMERICAL SIMULATIONS; THEORETICAL-MODEL; IMPULSIVE PHASE; LIMB FLARE; HARD; SPECTROMETER; MISSION AB In this paper we have analyzed images of 48 C-, M-, and X-type flares which occurred between 1991 October and 1993 February. The images were recorded by the soft X-ray telescope (SXT) flown on the Japanese Yohkoh spacecraft. The spatial resolution of the recorded images is about 2.5''. In each of the recorded flares the brightest regions emitting the 10(7) K radiation were analyzed and evaluated. The 10(7) K emitting region was found to be located at loop tops in the first well-exposed flare image recorded during the rise phase (within 1-2 minutes after flare onset), in images recorded near intensity peak, and in those recorded during most of the decay phase. Occasionally, in the begining of the event when the total flare intensity is low, the brightness of the footpoints may rival the brightness of the loop top. However, in these cases it is expected that the temperature of the loop top is considerably higher. The emitting region, even during flare peak, is very small (often smaller than a single SXT pixel 1800 x 1800 km). C1 LOCKHEED PALO ALTO RES LABS,PALO ALTO,CA 94304. UNIV TOKYO,DEPT ASTRON,BUNKYO KU,TOKYO 113,JAPAN. UNIV TOKYO,INST ASTRON,TOKYO 181,JAPAN. RP FELDMAN, U (reprint author), USN,RES LAB,EO HULBURT CTR SPACE RES,WASHINGTON,DC 20375, USA. NR 42 TC 35 Z9 35 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 20 PY 1994 VL 424 IS 1 BP 444 EP 458 DI 10.1086/173902 PN 1 PG 15 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA NA499 UT WOS:A1994NA49900036 ER PT J AU CLAUSSEN, MJ GAUME, RA JOHNSTON, KJ WILSON, TL AF CLAUSSEN, MJ GAUME, RA JOHNSTON, KJ WILSON, TL TI THE W3 IRS-5 CLUSTER - RADIO-CONTINUUM AND WATER MASER OBSERVATIONS SO ASTROPHYSICAL JOURNAL LA English DT Article DE H-II REGIONS; MASERS; RADIO CONTINUUM, ISM; STARS, FORMATION ID EARLY-TYPE STARS; EMISSION; REGIONS; SPECTRUM AB High sensitivity and angular resolution observations of the radio continuum toward W3 IRS 5, along with observations of strong water masers, have been made with the VLA. At least seven distinct radio continuum sources have been discovered, which are most likely a cluster of B0.5-B0 stars with ionized stellar winds. This is in contrast to previous interpretations of observational data, which suggested that IRS 5 is a single massive protostar with bolometric luminosity of 2 x 10(5) L.. The spatial distribution of the water masers roughly follows that of the radio sources; and these masers show a gradient in radial velocity similar to that found in a larger scale molecular outflow. We suggest that previously observed, multicomponent absorption in CO infrared transitions traces outflows from the several stellar wind sources, rather than episodic outbursts from a single source. C1 USN,RES LAB,DIV REMOTE SENSING,WASHINGTON,DC 20375. MAX PLANCK INST RADIOASTRON,D-53121 BONN,GERMANY. RP CLAUSSEN, MJ (reprint author), NATL RADIO ASTRON OBSERV,POB O,SOCORRO,NM 87801, USA. NR 24 TC 41 Z9 41 U1 0 U2 0 PU UNIV CHICAGO PRESS PI CHICAGO PA 5720 S WOODLAWN AVE, CHICAGO, IL 60637 SN 0004-637X J9 ASTROPHYS J JI Astrophys. J. PD MAR 20 PY 1994 VL 424 IS 1 BP L41 EP L44 DI 10.1086/187270 PN 2 PG 4 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA NA500 UT WOS:A1994NA50000011 ER PT J AU TAYLOR, M BLESS, RC OGELMAN, H ELLIOT, JL GALLAGHER, JS NELSON, MJ PERCIVAL, JW ROBINSON, EL VANCITTERS, GW AF TAYLOR, M BLESS, RC OGELMAN, H ELLIOT, JL GALLAGHER, JS NELSON, MJ PERCIVAL, JW ROBINSON, EL VANCITTERS, GW TI ULTRAVIOLET PHOTOMETRY OF NOVA CYGNI 1992 OBTAINED WITH THE HIGH-SPEED PHOTOMETER SO ASTROPHYSICAL JOURNAL LA English DT Article DE STARS, INDIVIDUAL (NOVA CYGNI-1992); STARS, NOVAE, CATACLYSMIC VARIABLES; STARS, OSCILLATIONS ID CATACLYSMIC VARIABLES; X-RAY AB In this Letter we present the first high-speed ultraviolet photometry of an active, classical nova, Nova Cygni 1992. The 45 minute observation shows significant evidence for power at frequencies that correspond to periods of about 565 and 900 s. Each of these periods has an amplitude of about 3 mmag. Since this data set is short, we cannot establish the nature of the detected variability and so, we discuss possible physical mechanisms ranging from short-lived phenomena to stable periodic modulations that could result in the observed variations. C1 UNIV WISCONSIN,DEPT PHYS,MADISON,WI 53706. USN ACAD,DEPT AEROSP ENGN,ANNAPOLIS,MD 21402. MIT,DEPT EARTH ATMOSPHER & PLANETARY SCI,CAMBRIDGE,MA 02139. MIT,DEPT PHYS,CAMBRIDGE,MA 02139. UNIV TEXAS,DEPT ASTRON,AUSTIN,TX 78712. NATL SCI FDN,DIV ASTRON SCI,WASHINGTON,DC 20550. RP TAYLOR, M (reprint author), UNIV WISCONSIN,DEPT ASTRON,MADISON,WI 53706, USA. NR 21 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 20 PY 1994 VL 424 IS 1 BP L45 EP L48 DI 10.1086/187271 PN 2 PG 4 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA NA500 UT WOS:A1994NA50000012 ER PT J AU RUDIN, S REINECKE, TL AF RUDIN, S REINECKE, TL TI PLASMONS LOCALIZED AT POINT CHARGES IN SEMICONDUCTOR QUANTUM-WELLS SO SURFACE SCIENCE LA English DT Article AB The plasmon excitations of inhomogeneous carrier gases in semiconductor quantum wells in the presence of point charge impurities are investigated. The random phase approximation for the carrier gas yields an integral equation which expresses the condition that plasmons may be self-consistently localized in the vicinity of the impurity. The localized plasmon is a density wave trapped at the impurity site and exists in the electron (hole) gas only for negative (positive) impurity charge. Bound states of the intersubband plasmon are found for all densities of the carrier gas in a quantum well, a result which differs qualitatively from the bulk case. Numerical results for the binding energies are given for a range of relevant parameters. C1 USN, RES LAB, WASHINGTON, DC 20375 USA. RP USA, RES LAB, FT MONMOUTH, NJ 07703 USA. NR 5 TC 0 Z9 0 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0039-6028 EI 1879-2758 J9 SURF SCI JI Surf. Sci. PD MAR 20 PY 1994 VL 305 IS 1-3 BP 267 EP 270 DI 10.1016/0039-6028(94)90898-2 PG 4 WC Chemistry, Physical; Physics, Condensed Matter SC Chemistry; Physics GA ND674 UT WOS:A1994ND67400049 ER PT J AU YANG, MJ WAGNER, RJ LINCHUNG, PJ SHANABROOK, BV WATERMAN, JR MOORE, WJ DAVIS, JL AF YANG, MJ WAGNER, RJ LINCHUNG, PJ SHANABROOK, BV WATERMAN, JR MOORE, WJ DAVIS, JL TI SPIN-RESOLVED CYCLOTRON-RESONANCE IN A 2D ELECTRON-GAS SO SURFACE SCIENCE LA English DT Article; Proceedings Paper CT 10th International Conference on Electronic Properties of Two-Dimensional Systems (EP2DS-10) CY MAY 31-JUN 04, 1993 CL NEWPORT, RI SP USA, RES OFF, NATL SCI FDN, USN, OFF NAVAL RES, SUNY BUFFALO, DEPT PHYS & ASTRON, BROWN UNIV, CTR ADV MAT RES AB We report the observation of spin-resolved cyclotron resonance of a 2DEG in an InAs quantum well. The data show that the g-factor of a 2DEG has a smaller energy dependence than that of bulk electrons. The reduction of the spin-splitting in a 2DEG can be accounted for by a calculation which includes the nonparabolicity of the band structure. RP YANG, MJ (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 8 TC 4 Z9 4 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 MAR 20 PY 1994 VL 305 IS 1-3 BP 271 EP 274 DI 10.1016/0039-6028(94)90899-0 PG 4 WC Chemistry, Physical; Physics, Condensed Matter SC Chemistry; Physics GA ND674 UT WOS:A1994ND67400050 ER PT J AU CHOI, JB MEYER, JR HOFFMAN, CA KARCZEWSKI, G FURDYNA, JK YOO, KH FAURIE, JP AF CHOI, JB MEYER, JR HOFFMAN, CA KARCZEWSKI, G FURDYNA, JK YOO, KH FAURIE, JP TI REFLECTIVITY, TRANSPORT AND MAGNETOOPTICAL STUDIES OF HOLES IN THE P-TYPE HGZNTE/CDTE SUPERLATTICE SO SURFACE SCIENCE LA English DT Article; Proceedings Paper CT 10th International Conference on Electronic Properties of Two-Dimensional Systems (EP2DS-10) CY MAY 31-JUN 04, 1993 CL NEWPORT, RI SP USA, RES OFF, NATL SCI FDN, USN, OFF NAVAL RES, SUNY BUFFALO, DEPT PHYS & ASTRON, BROWN UNIV, CTR ADV MAT RES ID ELECTRON AB We report the first systematic experimental investigation of the anomalous properties of holes in a p-type HgZnTe/CdTe superlattice by performing reflectivity, transport and magneto-optical measurements. The transport and cyclotron resonance data are fully correlated with the polarization-dependent reflectivity, and show consistent behavior of two holes with different mobilities. The observed distinctive features of the holes are accurately explained by the extremely non-parabolic and anisotropic valence band structure. C1 USN,RES LAB,WASHINGTON,DC 20375. UNIV NOTRE DAME,DEPT PHYS,NOTRE DAME,IN 47907. KYUNG HEE UNIV,DEPT PHYS,SEOUL,SOUTH KOREA. UNIV ILLINOIS,DEPT PHYS,CHICAGO,IL 60680. RP CHOI, JB (reprint author), CHUNGBUK NATL UNIV,DEPT PHYS,CHONGJU 360763,SOUTH KOREA. NR 5 TC 0 Z9 0 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 MAR 20 PY 1994 VL 305 IS 1-3 BP 285 EP 289 DI 10.1016/0039-6028(94)90902-4 PG 5 WC Chemistry, Physical; Physics, Condensed Matter SC Chemistry; Physics GA ND674 UT WOS:A1994ND67400053 ER PT J AU FOTHERGILL, DM CARLSON, NA AF FOTHERGILL, DM CARLSON, NA TI THE INFLUENCE OF INERT-GAS NARCOSIS ON EXERCISE TOLERANCE AND PSYCHOPHYSICAL PERCEPTIONS OF EXERTION 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 18 PY 1994 VL 8 IS 5 BP A845 EP A845 PG 1 WC Biochemistry & Molecular Biology; Biology; Cell Biology SC Biochemistry & Molecular Biology; Life Sciences & Biomedicine - Other Topics; Cell Biology GA ND197 UT WOS:A1994ND19701507 ER PT J AU GUMMIN, DD DOUBT, TJ THORP, JW AF GUMMIN, DD DOUBT, TJ THORP, JW TI USE OF DESMOPRESSIN (DDAVP) IN IMMERSION DIURESIS 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 18 PY 1994 VL 8 IS 5 BP A838 EP A838 PG 1 WC Biochemistry & Molecular Biology; Biology; Cell Biology SC Biochemistry & Molecular Biology; Life Sciences & Biomedicine - Other Topics; Cell Biology GA ND197 UT WOS:A1994ND19701465 ER PT J AU KAUFMAN, JW AF KAUFMAN, JW TI ANALYSIS OF VARIABLES INFLUENCING RESPIRATORY THERMAL WASHOUT CURVES SO FASEB JOURNAL LA English DT Meeting Abstract C1 USN,CTR AIR WARFACE,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 18 PY 1994 VL 8 IS 5 BP A688 EP A688 PG 1 WC Biochemistry & Molecular Biology; Biology; Cell Biology SC Biochemistry & Molecular Biology; Life Sciences & Biomedicine - Other Topics; Cell Biology GA ND197 UT WOS:A1994ND19700598 ER PT J AU MILLER, GA DEMAYO, T HUTTER, J AF MILLER, GA DEMAYO, T HUTTER, J TI PRODUCTION OF INTERLEUKIN-1 BY POLYMORPHONUCLEAR LEUKOCYTES PRESENT IN INFLAMMATORY PERIRADICULAR TISSUES SO FASEB JOURNAL LA English DT Meeting Abstract C1 GEOCENTERS INC,DIV BIOMED,BETHESDA,MD 20889. USN,SCH DENT,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 18 PY 1994 VL 8 IS 5 BP A996 EP A996 PG 1 WC Biochemistry & Molecular Biology; Biology; Cell Biology SC Biochemistry & Molecular Biology; Life Sciences & Biomedicine - Other Topics; Cell Biology GA ND197 UT WOS:A1994ND19702375 ER PT J AU WILLIAMS, RL MCKIRNAN, MD BROWN, IP BURGER, G LIMJOCO, U GRAY, CG AF WILLIAMS, RL MCKIRNAN, MD BROWN, IP BURGER, G LIMJOCO, U GRAY, CG TI NITRIC-OXIDE (NO) INHIBITION IN HEMORRHAGIC-SHOCK SO FASEB JOURNAL LA English DT Meeting Abstract C1 UCSD,DEPT PATHOL,SAN DIEGO,CA 92093. USN,MED CTR,CID,SAN DIEGO,CA 92093. 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 18 PY 1994 VL 8 IS 5 BP A860 EP A860 PG 1 WC Biochemistry & Molecular Biology; Biology; Cell Biology SC Biochemistry & Molecular Biology; Life Sciences & Biomedicine - Other Topics; Cell Biology GA ND197 UT WOS:A1994ND19701594 ER PT J AU LEE, SS MINSEK, DW VESTYCK, DJ CHEN, P AF LEE, SS MINSEK, DW VESTYCK, DJ CHEN, P TI GROWTH OF DIAMOND FROM ATOMIC-HYDROGEN AND A SUPERSONIC FREE JET OF METHYL RADICALS SO SCIENCE LA English DT Article ID CHEMICAL VAPOR-DEPOSITION; PHOTOELECTRON-SPECTROSCOPY; MULTIPHOTON IONIZATION; FILM GROWTH; MECHANISM AB The growth of small (similar to-10-micrometer) diamond particles (on 0.1- or 0.25-micrometer seed crystals) using an effusive glow discharge nozzle for H. and a separate supersonic pyrolysis jet for .CH3 is reported. Laser micro-Raman, scanning electron microscopy, and x-ray photoelectron spectroscopy data are presented as evidence that well-crystallized diamond is indeed formed. Resonant multiphoton ionization spectroscopy is used as a diagnostic for the gas-phase chemistry indicating that the radical sources are clean and quantitative and that there is no detectable interconversion of .CH3 to C2H2 under the conditions of the experiment. Diamond growth is found at substrate temperatures greater than or equal to 650 degrees C with no marked increase in the rate of growth up to 850 degrees C. Acetylene does not give good quality diamond under similar conditions. C1 HARVARD UNIV,MALLINCKRODT CHEM LAB,CAMBRIDGE,MA 02138. USN,RES LAB,WASHINGTON,DC 20375. NR 30 TC 67 Z9 68 U1 0 U2 9 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 18 PY 1994 VL 263 IS 5153 BP 1596 EP 1598 DI 10.1126/science.263.5153.1596 PG 3 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA NB673 UT WOS:A1994NB67300026 PM 17744789 ER PT J AU PRIEBE, CE SOLKA, JL LOREY, RA ROGERS, GW POSTON, WL KALLERGI, M QIAN, W CLARKE, LP CLARK, RA AF PRIEBE, CE SOLKA, JL LOREY, RA ROGERS, GW POSTON, WL KALLERGI, M QIAN, W CLARKE, LP CLARK, RA TI THE APPLICATION OF FRACTAL ANALYSIS TO MAMMOGRAPHIC TISSUE CLASSIFICATION SO CANCER LETTERS LA English DT Article DE COMPUTATIONAL STATISTICS; COMPUTER ASSISTED DIAGNOSIS; WOLFE PATTERNS; FEATURE EXTRACTION; PATTERN RECOGNITION; FRACTALS; PROBABILITY DENSITY FUNCTION ID DEVELOPING BREAST-CANCER; TEXTURE ANALYSIS; RISK; PATTERNS AB As a first step in determining the efficacy of using computers to assist in diagnosis of medical images, an investigation has been conducted which utilizes the patterns, or textures, in the images. To be of value, any computer scheme must be able to recognize and differentiate the various patterns. An obvious example of this in mammography is the recognition of tumorous tissue and non-malignant abnormal tissue from normal parenchymal tissue. We have developed a pattern recognition technique which uses features derived from the fractal nature of the image. Further, we are able to develop mathematical models which can be used to differentiate and classify the many tissue types. Based on a limited number of cases of digitized mammograms, our computer algorithms have been able to distinguish tumorous from healthy tissue and to distinguish among various parenchymal tissue patterns. These preliminary results indicate that discrimination based on the fractal nature of images may well represent a viable approach to utilizing computers to assist in diagnosis. C1 UNIV S FLORIDA,H LEE MOFFITT CANC CTR,TAMPA,FL 33682. RP PRIEBE, CE (reprint author), USN,CTR SURFACE WARFARE,DIV DAHLGREN,ADV COMPUTAT TECHNOL GRP,CODE B10,DAHLGREN,VA 22448, USA. RI Priebe, Carey E./A-3305-2010; Qian, Wei/B-8231-2013 NR 20 TC 34 Z9 34 U1 0 U2 1 PU ELSEVIER SCI IRELAND LTD PI CLARE PA CUSTOMER RELATIONS MANAGER, BAY 15, SHANNON INDUSTRIAL ESTATE CO, CLARE, IRELAND SN 0304-3835 J9 CANCER LETT JI Cancer Lett. PD MAR 15 PY 1994 VL 77 IS 2-3 BP 183 EP 189 DI 10.1016/0304-3835(94)90101-5 PG 7 WC Oncology SC Oncology GA NG274 UT WOS:A1994NG27400015 PM 8168065 ER PT J AU TELLADO, M SPECHT, CS VARGAS, J MCLEAN, IW AF TELLADO, M SPECHT, CS VARGAS, J MCLEAN, IW TI ADENOID CYSTIC CARCINOMAS OF THE ORBIT IN CHILDHOOD AND ADOLESCENCE SO INVESTIGATIVE OPHTHALMOLOGY & VISUAL SCIENCE LA English DT Meeting Abstract C1 USN HOSP,DEPT OPHTHALMOL,CHARLESTON,SC. SHADYSIDE HOSP,INST PATHOL,PITTSBURGH,PA 15232. AFIP,DEPT OPHTHALM PATHOL,WASHINGTON,DC. 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 1994 VL 35 IS 4 BP 1565 EP 1565 PG 1 WC Ophthalmology SC Ophthalmology GA MZ585 UT WOS:A1994MZ58501444 ER PT J AU SCHALLHORN, SC BLANTON, CL GORDON, M SUTPHIN, JE FULCHER, S AF SCHALLHORN, SC BLANTON, CL GORDON, M SUTPHIN, JE FULCHER, S TI ASSESSMENT OF VISUAL PERFORMANCE AFTER PHOTOREFRACTIVE KERATECTOMY USING A 6 MM ABLATION ZONE SO INVESTIGATIVE OPHTHALMOLOGY & VISUAL SCIENCE LA English DT Meeting Abstract C1 USN,MED CTR,DEPT OPHTHALMOL,SAN DIEGO,CA 92132. VISION SURG & LASER CTR,LA JOLLA,CA. UNIV IOWA,DEPT OPHTHALMOL,IOWA CITY,IA 52242. SCOTT & WHITE MEM HOSP & CLIN,DEPT OPHTHALMOL,TEMPLE,TX. 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 1994 VL 35 IS 4 BP 1651 EP 1651 PG 1 WC Ophthalmology SC Ophthalmology GA MZ585 UT WOS:A1994MZ58501837 ER PT J AU TAM, MYM CHOPLIN, NT COLEMAN, AL HILL, RA WILSON, MR PANEK, WC AF TAM, MYM CHOPLIN, NT COLEMAN, AL HILL, RA WILSON, MR PANEK, WC TI PRELIMINARY-RESULTS OF GLAUCOMA VALVE IMPLANT CLINICAL-TRIAL SO INVESTIGATIVE OPHTHALMOLOGY & VISUAL SCIENCE LA English DT Meeting Abstract C1 UNIV CALIF IRVINE,IRVINE,CA 92717. UNIV CALIF LOS ANGELES,JULES STEIN EYE INST,LOS ANGELES,CA 90024. USN,MED CTR,SAN DIEGO,CA 92132. NR 0 TC 3 Z9 3 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 1994 VL 35 IS 4 BP 1914 EP 1914 PG 1 WC Ophthalmology SC Ophthalmology GA MZ585 UT WOS:A1994MZ58503043 ER PT J AU HUNT, KE TIDWELL, JL AF HUNT, KE TIDWELL, JL TI A COMPARISON OF ANTERIOR-CHAMBER ASPIRATES BETWEEN EXTRACAPSULAR CATARACT-EXTRACTION AND PHACOEMULSIFICATION SO INVESTIGATIVE OPHTHALMOLOGY & VISUAL SCIENCE LA English DT Meeting Abstract C1 USN,MED CTR,SAN DIEGO,CA. NR 0 TC 2 Z9 2 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 1994 VL 35 IS 4 BP 1966 EP 1966 PG 1 WC Ophthalmology SC Ophthalmology GA MZ585 UT WOS:A1994MZ58503291 ER PT J AU CHOPLIN, NT WESTEREN, AC SINCLAIR, Y AF CHOPLIN, NT WESTEREN, AC SINCLAIR, Y TI THE EFFECT OF CATARACT-SURGERY ON INTRAOCULAR-PRESSURE IN NORMALS SO INVESTIGATIVE OPHTHALMOLOGY & VISUAL SCIENCE LA English DT Meeting Abstract C1 USN,MED CTR,DEPT CLIN INVEST,SAN DIEGO,CA 92132. NYU MED CTR,NEW YORK,NY 10016. USN,MED CTR,DEPT OPHTHALMOL,SAN DIEGO,CA 92132. NR 0 TC 1 Z9 1 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 1994 VL 35 IS 4 BP 1969 EP 1969 PG 1 WC Ophthalmology SC Ophthalmology GA MZ585 UT WOS:A1994MZ58503309 ER PT J AU NELSON, DJ AVALLONE, JM HALL, F HOUSTON, LL AF NELSON, DJ AVALLONE, JM HALL, F HOUSTON, LL TI LOCALIZATION OF MONOCLONAL ANTIBODY-454A12 IN HUMAN RETINOBLASTOMA - A PILOT-STUDY SO INVESTIGATIVE OPHTHALMOLOGY & VISUAL SCIENCE LA English DT Meeting Abstract C1 USN,MED CTR,DEPT OPHTHALMOL,SAN DIEGO,CA 92132. USN,MED CTR,DEPT CLIN INVEST,SAN DIEGO,CA 92132. USN,MED CTR,DEPT PATHOL,SAN DIEGO,CA 92132. CETUS CORP,EMERYVILLE,CA 94608. 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 1994 VL 35 IS 4 BP 2119 EP 2119 PG 1 WC Ophthalmology SC Ophthalmology GA MZ585 UT WOS:A1994MZ58504002 ER PT J AU GARRETT, J REDDY, S RYAN, J KIM, J SHIRK, J KENNEY, M KRASIEVA, T TROMBERG, B BERNS, MW HILL, RA AF GARRETT, J REDDY, S RYAN, J KIM, J SHIRK, J KENNEY, M KRASIEVA, T TROMBERG, B BERNS, MW HILL, RA TI PHOTODYNAMIC THERAPY (PDT) OF EXPERIMENTAL OCULAR MELANOMA WITH SILICON NAPHTHALOCYANINE (SINC) IN RABBITS SO INVESTIGATIVE OPHTHALMOLOGY & VISUAL SCIENCE LA English DT Meeting Abstract C1 UNIV CALIF IRVINE,DEPT OPHTHALMOL,IRVINE,CA 92717. UNIV CALIF IRVINE,BECKMAN LASER INST,IRVINE,CA 92717. UNIV CALIF IRVINE,MED CLIN,IRVINE,CA 92717. USN,RES LAB,WASHINGTON,DC 20375. CASE WESTERN RESERVE UNIV,CLEVELAND,OH 44106. NR 0 TC 2 Z9 2 U1 0 U2 1 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 1994 VL 35 IS 4 BP 2120 EP 2120 PG 1 WC Ophthalmology SC Ophthalmology GA MZ585 UT WOS:A1994MZ58504007 ER PT J AU DIVITA, JC VANORDEN, KF AF DIVITA, JC VANORDEN, KF TI A MODEL FOR PREATTENTIVE CONJUNCTIONS SO INVESTIGATIVE OPHTHALMOLOGY & VISUAL SCIENCE LA English DT Meeting Abstract C1 USN,SUBMARINE MED RES LAB,GROTON,CT 06340. 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 1994 VL 35 IS 4 BP 2148 EP 2148 PG 1 WC Ophthalmology SC Ophthalmology GA MZ585 UT WOS:A1994MZ58504134 ER PT J AU DEENEY, C LEPELL, PD FAILOR, BH MEACHUM, JS WONG, S THORNHILL, JW WHITNEY, KG COULTER, MC AF DEENEY, C LEPELL, PD FAILOR, BH MEACHUM, JS WONG, S THORNHILL, JW WHITNEY, KG COULTER, MC TI RADIUS AND CURRENT SCALING OF ARGON K-SHELL RADIATION SO JOURNAL OF APPLIED PHYSICS LA English DT Article ID X-RAY-EMISSION; Z-PINCHES; PLASMAS AB Argon gas puff experiments on a 3-4 MA generator show that the K-shell x-ray yield is optimized for a 2.5 cm initial diameter and 110 ns implosion time. By varying the driver current, the K-shell yield varies from 13 to 18 kJ following a current to the fourth power scaling. Comparisons of these experimental data to one-dimensional radiation-hydrodynamic simulations with and without enhanced transport coefficients show that the measured K-shell yields exceed those predicted based solely on kinetic energy input. C1 USN,RES LAB,WASHINGTON,DC 20375. RP DEENEY, C (reprint author), PHYS INT CO,SAN LEANDRO,CA 94577, USA. NR 18 TC 29 Z9 30 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 MAR 15 PY 1994 VL 75 IS 6 BP 2781 EP 2788 DI 10.1063/1.356217 PG 8 WC Physics, Applied SC Physics GA NB413 UT WOS:A1994NB41300008 ER PT J AU CHOU, WC TWARDOWSKI, A CHERNYU, K CHEN, FR HUA, CR JONKER, BT YU, WY LEE, ST PETROU, A WARNOCK, J AF CHOU, WC TWARDOWSKI, A CHERNYU, K CHEN, FR HUA, CR JONKER, BT YU, WY LEE, ST PETROU, A WARNOCK, J TI OPTICAL STUDY OF STRAINED ZNSE/GAAS AND ZNMNSE/GAAS EPILAYERS SO JOURNAL OF APPLIED PHYSICS LA English DT Article ID QUANTUM-WELL STRUCTURES; BEAM EPITAXIAL-GROWTH; P-TYPE ZNSE; EXCITONIC TRANSITIONS; SEMICONDUCTOR HETEROSTRUCTURES; LATTICE-PARAMETERS; BIAXIAL-STRAIN; GAAS; REFLECTIVITY; SPECTRA AB We studied strain-induced band splittings of ZnSe/GaAs and Zn1-xMnxSe/GaAs epilayers of 0.064-3 mum thickness by reflectance and polarized photoluminescence. Polarized photoluminescence was found particularly useful in optical transition identification. The spectacular difference in magnetic field sensitivity of heavy hole and light hole exciton in ZnMnSe is also very helpful in transition identification. The evaluated heavy-light hole band splitting is in general accordance with previous data. An exceptionally strong variation of the strain with epilayer thickness is observed in the thickness range 0.5-2 mum. C1 USN,RES LAB,WASHINGTON,DC 20375. SUNY BUFFALO,DEPT SPACE RES,BUFFALO,NY 14260. IBM CORP,THOMAS J WATSON RES CTR,DIV RES,YORKTOWN HTS,NY 10598. RP CHOU, WC (reprint author), CHUNG YUAN CHRISTIAN UNIV,DEPT PHYS,CHUNGLI 32023,TAIWAN. NR 24 TC 15 Z9 16 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 MAR 15 PY 1994 VL 75 IS 6 BP 2936 EP 2940 DI 10.1063/1.356188 PG 5 WC Physics, Applied SC Physics GA NB413 UT WOS:A1994NB41300028 ER PT J AU CHERNYU, K CHOU, WC TWARDOWSKI, A YU, WY LEE, ST PETROU, A WARNOCK, J JONKER, BT AF CHERNYU, K CHOU, WC TWARDOWSKI, A YU, WY LEE, ST PETROU, A WARNOCK, J JONKER, BT TI LINE-SHAPE ANALYSIS OF REFLECTANCE SPECTRA FROM ZNSE/ZN0.99FE0.01SE SPIN SUPERLATTICES SO JOURNAL OF APPLIED PHYSICS LA English DT Article ID QUANTUM-WELL STRUCTURES AB Line-shape analysis of magnetoreflectance spectra from ZnSe/Zn0.99Fe0.01Se quantum well structures was performed using a classical dielectric function model. This model explains the spectral dependence on the sample geometry, as well as providing additional evidence of spin superlattice formation in ZnSe/ZnFeSe heterostructures. C1 UNIV WARSAW,INST EXPTL PHYS,PL-00681 WARSAW,POLAND. SUNY BUFFALO,DEPT PHYS,BUFFALO,NY 14260. IBM CORP,THOMAS J WATSON RES CTR,DIV RES,YORKTOWN HTS,NY 10598. USN,RES LAB,WASHINGTON,DC 20375. RP CHERNYU, K (reprint author), CHUNG YUAN CHRISTIAN UNIV,DEPT PHYS,CHUNGLI 32023,TAIWAN. NR 10 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 MAR 15 PY 1994 VL 75 IS 6 BP 2988 EP 2991 DI 10.1063/1.356195 PG 4 WC Physics, Applied SC Physics GA NB413 UT WOS:A1994NB41300036 ER PT J AU KUIPER, P DUNLAP, BI AF KUIPER, P DUNLAP, BI TI THE SIGMA-ASTERISK ABSORPTION PEAK AT THE OXYGEN 1S EDGE OF O-2 - EXCHANGE SPLITTING, ULTRAFAST DISSOCIATION, AND ATOMIC-LIKE AUGER-SPECTRA SO JOURNAL OF CHEMICAL PHYSICS LA English DT Article ID MOLECULAR-OXYGEN; SYNCHROTRON-RADIATION; HIGH-RESOLUTION; DECAY CHANNELS; CORE; EXCITATION; SHELL; O2; PHOTODISSOCIATION; AUTOIONIZATION AB The x-ray absorption spectrum of solid O-2 at the O 1s absorption edge is analyzed, using its polarization dependence and the Anger de-excitation spectra. Rydberg states are quenched in the solid, and the exchange splitting of the Is ionization threshold (1.1 eV) can be observed. Below the ionization threshold, core electrons can be excited into unoccupied antibonding pi* and o* orbitals. We conclude from the relative intensities and from the polarization dependence, that the exchange splitting of the o* final-state is small (<1 eV). This is confirmed by LDA calculations of core-excited states. The calculated dr potential surfaces are repulsive, which explains the large width of this absorption peak. Because of ultrafast dissociation (similar to 5 fs), core hole decay is likely to occur at large interatomic distances. Anger spectra at the o* absorption of O-2 do indeed show peaks that would be expected for free core-excited oxygen atoms. C1 BROOKHAVEN NATL LAB,DEPT PHYS,UPTON,NY 11973. USN,RES LAB,THEORET CHEM SECT,WASHINGTON,DC 20375. RI Kuiper, Pieter/A-6806-2012 NR 41 TC 27 Z9 27 U1 1 U2 4 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0021-9606 J9 J CHEM PHYS JI J. Chem. Phys. PD MAR 15 PY 1994 VL 100 IS 6 BP 4087 EP 4092 DI 10.1063/1.466346 PG 6 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA NA918 UT WOS:A1994NA91800007 ER PT J AU LINCHUNG, PJ RAJAGOPAL, AK AF LINCHUNG, PJ RAJAGOPAL, AK TI MAGNETOPLASMA OSCILLATIONS IN NANOSCALE TUBULES WITH HELICAL SYMMETRY SO PHYSICAL REVIEW B LA English DT Article AB The collective excitations associated with density fluctuations of a system of electrons on nanoscale tubules when a constant magnetic field is present along the tube axes are presented. Several types of acoustic and optical magnetoplasma modes are found. The Kohn anomalies associated with the static density response for appropriate particle-hole excitations across the Fermi surface are also discussed. When the spin-paramagnetic contribution is ignored, it is found that the Fermi energy, magnetization, magnetic susceptibility, and the collective properties are periodic in the magnetic flux enclosed by the cylinder. For these to be relevant to graphitic tubules, which are thought to be obtained by rolling two-dimensional graphite sheets into cylinders, their inherent helical structures must be incorporated into the theory. It is shown that a transformation of the cylindrical wave states to helical wave states allows these results to be made relevant to nanoscale tubules with helical symmetry. RP LINCHUNG, PJ (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 16 TC 51 Z9 51 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 MAR 15 PY 1994 VL 49 IS 12 BP 8454 EP 8463 DI 10.1103/PhysRevB.49.8454 PG 10 WC Physics, Condensed Matter SC Physics GA NG116 UT WOS:A1994NG11600069 ER PT J AU KIM, C QADRI, SB SCANLON, MR CAMMARATA, RC AF KIM, C QADRI, SB SCANLON, MR CAMMARATA, RC TI LOW-DIMENSION STRUCTURAL-PROPERTIES AND MICROINDENTATION STUDIES OF ION-BEAM-SPUTTERED MULTILAYERS OF AG/AL FILMS SO THIN SOLID FILMS LA English DT Article ID THIN-FILMS; MECHANICAL-PROPERTIES; SUPERLATTICES; DIFFRACTION; FOILS AB Artificially modulated silver/aluminum multilayer films with modulation wavelengths LAMBDA between 1.35 and 21.3 nm, and total film thicknesses of 1 mum were prepared by ion-beam sputtering. The mechanical properties of these films were investigated by a low load microhardness indentation technique. The films displayed increased hardness as the modulation wavelength decreased. X-ray diffraction scans showed well-defined small angle peaks and satellite peaks for high angles indicating a coherent multilayer structure. The hardness enhancement as the modulation wavelength decreases may be partially attributed to the Ag2Al formation at the interfaces. The high quality of the well-defined layer structure is confirmed by the presence of interference maxima corresponding to the number of bilayers in the low angle diffraction data for films with total film thicknesses less than 33.0 nm. C1 JOHNS HOPKINS UNIV,BALTIMORE,MD 21218. RP KIM, C (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. RI Cammarata, Robert /A-3307-2010 NR 21 TC 85 Z9 101 U1 1 U2 13 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 MAR 15 PY 1994 VL 240 IS 1-2 BP 52 EP 55 DI 10.1016/0040-6090(94)90692-0 PG 4 WC Materials Science, Multidisciplinary; Materials Science, Coatings & Films; Physics, Applied; Physics, Condensed Matter SC Materials Science; Physics GA NA905 UT WOS:A1994NA90500008 ER PT J AU HENDERSON, LJ KELLER, TM AF HENDERSON, LJ KELLER, TM TI SYNTHESIS AND CHARACTERIZATION OF POLY(CARBORANE SILOXANE ACETYLENE) SO MACROMOLECULES LA English DT Article ID POLYMERS; CONVERSION C1 USN, RES LAB, MAT CHEM BRANCH, CODE 6127, WASHINGTON, DC 20375 USA. NR 15 TC 59 Z9 62 U1 3 U2 12 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0024-9297 J9 MACROMOLECULES JI Macromolecules PD MAR 14 PY 1994 VL 27 IS 6 BP 1660 EP 1661 DI 10.1021/ma00084a060 PG 2 WC Polymer Science SC Polymer Science GA NB904 UT WOS:A1994NB90400060 ER PT J AU ROBERSON, CW HAFIZI, B AF ROBERSON, CW HAFIZI, B TI EFFECTS OF LONGITUDINAL BEAM COMPRESSION IN A FREE-ELECTRON LASER SO PHYSICAL REVIEW LETTERS LA English DT Article AB When the scaled growth rate of a free-electron laser (FEL) is plotted as a function of the scaled thermal velocity for the case of ideal beam compression, we find two distinct cases. If the FEL is in the energy-spread-dominated regime, the growth rate can be improved as a result of compression provided the scaled thermal velocity is less than unity. Surprisingly, we find that the growth rate is always improved if the FEL is in the emittance-dominated regime. C1 ICARUS RES,BETHESDA,MD 20814. USN,RES LAB,BEAM PHYS BRANCH,WASHINGTON,DC 20375. RP ROBERSON, CW (reprint author), OFF NAVAL RES,DIV PHYS,ARLINGTON,VA 22217, USA. NR 10 TC 4 Z9 4 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0031-9007 J9 PHYS REV LETT JI Phys. Rev. Lett. PD MAR 14 PY 1994 VL 72 IS 11 BP 1654 EP 1657 DI 10.1103/PhysRevLett.72.1654 PG 4 WC Physics, Multidisciplinary SC Physics GA NA492 UT WOS:A1994NA49200021 ER PT J AU CARROLL, TL HEAGY, J PECORA, LM AF CARROLL, TL HEAGY, J PECORA, LM TI SYNCHRONIZATION AND DESYNCHRONIZATION IN PULSE COUPLED RELAXATION-OSCILLATORS SO PHYSICS LETTERS A LA English DT Article ID DYNAMICS; ARRAYS AB We have studied the synchronization of an array of three globally pulse coupled relaxation oscillators. We vary the firing rate on one of the oscillators and see how this affects the synchronization of the oscillators for different coupling symmetries. We find that certain types of coupling make the array more responsive to parameter changes but still robust against noise. RP CARROLL, TL (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. OI Carroll, Thomas/0000-0002-2371-2049 NR 16 TC 12 Z9 13 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 MAR 14 PY 1994 VL 186 IS 3 BP 225 EP 229 DI 10.1016/0375-9601(94)90343-3 PG 5 WC Physics, Multidisciplinary SC Physics GA NB668 UT WOS:A1994NB66800006 ER PT J AU HICKMAN, JJ FOSTER, KE OPRISON, RC STENGER, DA SCHAFFNER, AE BARKER, JL AF HICKMAN, JJ FOSTER, KE OPRISON, RC STENGER, DA SCHAFFNER, AE BARKER, JL TI ENGINEERING OF ARTIFICIAL NEURONAL CELLULAR NETWORKS SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 SCI APPLICAT INT CORP,MCLEAN,VA 22101. USN,RES LAB,CTR BIOMOLEC SCI & ENGN,WASHINGTON,DC 20375. NINCDS,DIR,BNP,NEUROPHYSIOL LAB,BETHESDA,MD 20892. 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 MAR 13 PY 1994 VL 207 BP 6 EP BTEC PN 2 PG 0 WC Chemistry, Multidisciplinary SC Chemistry GA MY955 UT WOS:A1994MY95501749 ER PT J AU KARLE, IL AF KARLE, IL TI 50 YEARS OF RESEARCH SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 USN,RES LAB,STRUCT MATTER 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 MAR 13 PY 1994 VL 207 BP 6 EP WCC PN 2 PG 0 WC Chemistry, Multidisciplinary SC Chemistry GA MY955 UT WOS:A1994MY95502062 ER PT J AU HO, T WYNNE, KJ CHEN, X GARDELLA, JA AF HO, T WYNNE, KJ CHEN, X GARDELLA, JA TI A PROCEDURE TO CONSTRUCT SURFACE CONCENTRATION DEPTH PROFILES FROM ESCA DATA SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 GEORGE MASON UNIV,DEPT CHEM,FAIRFAX,VA 22030. USN,RES LAB,MAT CHEM BRANCH,WASHINGTON,DC 20375. OFF NAVAL RES,DIV CHEM,ARLINGTON,VA 22217. SUNY BUFFALO,DEPT CHEM,BUFFALO,NY 14260. 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 MAR 13 PY 1994 VL 207 BP 12 EP PMSE PN 2 PG 0 WC Chemistry, Multidisciplinary SC Chemistry GA MY955 UT WOS:A1994MY95501471 ER PT J AU HAYES, EA STEMPLE, JZ ROLISON, DR AF HAYES, EA STEMPLE, JZ ROLISON, DR TI DEGRADATION OF POLYCHLORINATED AROMATICS BY ELECTRIFIED MICROHETEROGENEOUS CATALYSIS (EMC) 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 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 MAR 13 PY 1994 VL 207 BP 15 EP INOR PN 1 PG 0 WC Chemistry, Multidisciplinary SC Chemistry GA MY954 UT WOS:A1994MY95402776 ER PT J AU RIVERANEVARES, J WYMAN, J VONMINDEN, D LACY, N MACYS, D AF RIVERANEVARES, J WYMAN, J VONMINDEN, D LACY, N MACYS, D TI FACILE SYNTHESIS, PHYSICAL, AND SPECTRAL CHARACTERIZATION OF 2,6-DI-TERT-BUTYL-4-NITROPHENOL (DBNP) - A POTENT UNCOUPLER OF OXIDATIVE-PHOSPHORYLATION SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 USN,MED RES INST DETACHMENT TOXICOL,WRIGHT PATTERSON AFB,OH 45433. 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 MAR 13 PY 1994 VL 207 BP 26 EP CHAS PN 1 PG 0 WC Chemistry, Multidisciplinary SC Chemistry GA MY954 UT WOS:A1994MY95401343 ER PT J AU THOMPSON, CM TING, RY JENKINS, LL AF THOMPSON, CM TING, RY JENKINS, LL TI DEVELOPMENT OF A TOUGHENED EPOXY FOR REINFORCED ACOUSTICAL WINDOWS SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 USN RES LAB,ORLANDO,FL 32806. 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 MAR 13 PY 1994 VL 207 BP 29 EP PMSE PN 2 PG 0 WC Chemistry, Multidisciplinary SC Chemistry GA MY955 UT WOS:A1994MY95501488 ER PT J AU WYMAN, J REO, N RIVERA, J MOORE, T PRUES, S LEE, D GOECKE, C ALVA, C AF WYMAN, J REO, N RIVERA, J MOORE, T PRUES, S LEE, D GOECKE, C ALVA, C TI HEPATOTOXICITY OF 2,6-DI-T-BUTYL-4-NITROPHENOL TO ISOLATED-PERFUSED RAT-LIVER SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 USN,MED RES INST,TOXICOL DETACHMENT,WRIGHT PATTERSON AFB,OH. WRIGHT STATE UNIV,DEPT BIOCHEM & MICROBIOL,DAYTON,OH 45435. GEOCENTERS INC,FT WASHINGTON,MD. 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 MAR 13 PY 1994 VL 207 BP 32 EP CHAS PN 1 PG 0 WC Chemistry, Multidisciplinary SC Chemistry GA MY954 UT WOS:A1994MY95401349 ER PT J AU THOMS, BD OWENS, MS BUTLER, JE SPIRO, C AF THOMS, BD OWENS, MS BUTLER, JE SPIRO, C TI THE STRUCTURE OF H/C(100) - MONOHYDRIDE DIMER 2X1 RECONSTRUCTION SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 USN,RES LAB,WASHINGTON,DC 20375. GE CO,CORP RES & DEV,SCHENECTADY,NY 12301. 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 MAR 13 PY 1994 VL 207 BP 35 EP COLL PN 1 PG 0 WC Chemistry, Multidisciplinary SC Chemistry GA MY954 UT WOS:A1994MY95401487 ER PT J AU HOWELL, BF ODONNELL, M AF HOWELL, BF ODONNELL, M TI UV CURABLE COATINGS FOR MARINE APPLICATIONS SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 USN,CTR SURFACE WAREFARE,CARDEROCK DIV,ANNAPOLIS,MD 21402. ENGN COMP OTEENOM INC,ANNAPOLIS,MD 21401. 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 MAR 13 PY 1994 VL 207 BP 37 EP PMSE PN 2 PG 0 WC Chemistry, Multidisciplinary SC Chemistry GA MY955 UT WOS:A1994MY95501496 ER PT J AU SHRIVERLAKE, LC GOLDEN, JP OGERT, RA LIGLER, FS AF SHRIVERLAKE, LC GOLDEN, JP OGERT, RA LIGLER, FS TI DETECTION OF LARGE AND SMALL MOLECULES BY AN EVANESCENT-WAVE FIBER OPTIC BIOSENSOR 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 MAR 13 PY 1994 VL 207 BP 54 EP BTEC PN 2 PG 0 WC Chemistry, Multidisciplinary SC Chemistry GA MY955 UT WOS:A1994MY95501797 ER PT J AU WIJESURIYA, D ANDERSON, GP LIGLER, FS AF WIJESURIYA, D ANDERSON, GP LIGLER, FS TI A RAPID AND SENSITIVE FIBER OPTIC IMMUNOASSAY FOR BACTERIA 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. GEOCENTERS INC,FT WASHINGTON,MD 20744. RI Anderson, George/D-2461-2011 OI Anderson, George/0000-0001-7545-9893 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 MAR 13 PY 1994 VL 207 BP 55 EP BTEC PN 2 PG 0 WC Chemistry, Multidisciplinary SC Chemistry GA MY955 UT WOS:A1994MY95501798 ER PT J AU MORRIS, RE WECHTER, MA AF MORRIS, RE WECHTER, MA TI THE APPLICATION OF LIGHT-SCATTERING PHOTOMETRY TO EVALUATE FUEL STABILITY 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 MAR 13 PY 1994 VL 207 BP 57 EP PETR PN 2 PG 0 WC Chemistry, Multidisciplinary SC Chemistry GA MY955 UT WOS:A1994MY95500626 ER PT J AU YU, H KUSTERBECK, AW LIGLER, FS AF YU, H KUSTERBECK, AW LIGLER, FS TI QUANTITATIVE-ANALYSIS USING THE FLOW IMMUNOSENSOR 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. GEORGETOWN UNIV,DEPT BIOCHEM & MOLEC BIOL,WASHINGTON,DC 20007. NR 0 TC 0 Z9 0 U1 1 U2 1 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD MAR 13 PY 1994 VL 207 BP 57 EP BTEC PN 2 PG 0 WC Chemistry, Multidisciplinary SC Chemistry GA MY955 UT WOS:A1994MY95501800 ER PT J AU PRUITT, DS HARDY, DR AF PRUITT, DS HARDY, DR TI ANALYSIS OF REACTANTS THAT LEAD TO THERMAL-INSTABILITY DEPOSITS IN AVIATION JET FUELS SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 OXON HILL HIGH SCH SCI & TECHNOL,OXON HILL,MD 20374. 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 MAR 13 PY 1994 VL 207 BP 66 EP PETR PN 2 PG 0 WC Chemistry, Multidisciplinary SC Chemistry GA MY955 UT WOS:A1994MY95500635 ER PT J AU BEAL, EJ HARDY, DR AF BEAL, EJ HARDY, DR TI THE EFFECT OF TEMPERATURE ON JET FUEL THERMAL-STABILITY DEFINED BY DIRECT GRAVIMETRIC ANALYSIS OF BOTH SURFACE AND FUEL INSOLUBLE DEPOSITS 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 MAR 13 PY 1994 VL 207 BP 68 EP PETR PN 2 PG 0 WC Chemistry, Multidisciplinary SC Chemistry GA MY955 UT WOS:A1994MY95500637 ER PT J AU MUSSELMAN, RL HEUER, WB AF MUSSELMAN, RL HEUER, WB TI INTENSE ELECTRONIC-TRANSITIONS - POLARIZATIONS FROM SPECULAR REFLECTANCE AS A SPECTROSCOPIC ASSIGNMENT TOOL SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 FRANKLIN & MARSHALL COLL,LANCASTER,PA 17604. USN ACAD,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 MAR 13 PY 1994 VL 207 BP 71 EP CHED PN 1 PG 0 WC Chemistry, Multidisciplinary SC Chemistry GA MY954 UT WOS:A1994MY95400901 ER PT J AU HICKMAN, JJ FOSTER, KE KOWTHA, V BEY, P STENGER, DA AF HICKMAN, JJ FOSTER, KE KOWTHA, V BEY, P STENGER, DA TI WHOLE-CELL BASED BIOSENSORS SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 SCI APPLICAT INT CORP,MCLEAN,VA 22102. USN,RES LAB,CTR BIOMOLEC SCI & ENGN,WASHINGTON,DC 20375. NR 0 TC 0 Z9 0 U1 1 U2 2 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 MAR 13 PY 1994 VL 207 BP 76 EP BTEC PN 2 PG 0 WC Chemistry, Multidisciplinary SC Chemistry GA MY955 UT WOS:A1994MY95501819 ER PT J AU WRIGHT, ME MULLICK, S HOOVER, JM LEE, BC AF WRIGHT, ME MULLICK, S HOOVER, JM LEE, BC TI MOLECULAR CHANDELIERS - NOVEL STRUCTURES FOR THE CONSTRUCTION OF THIN-FILMS SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 UTAH STATE UNIV,DEPT CHEM & BIOCHEM,LOGAN,UT 84322. USN,CTR WARFARE,DIV WEAPONS,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 MAR 13 PY 1994 VL 207 BP 122 EP ORGN PN 2 PG 0 WC Chemistry, Multidisciplinary SC Chemistry GA MY955 UT WOS:A1994MY95500199 ER PT J AU HEUER, WB PEARSON, WH AF HEUER, WB PEARSON, WH TI PREPARATION AND CHARACTERIZATION OF METAL-DITHIOCROCONATE COMPLEXES 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 MAR 13 PY 1994 VL 207 BP 124 EP INOR PN 1 PG 0 WC Chemistry, Multidisciplinary SC Chemistry GA MY954 UT WOS:A1994MY95402885 ER PT J AU SHULL, H AF SHULL, H TI THE QCPE EXPERIMENT SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 USN,POSTGRAD SCH,MONTEREY,CA 93940. 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 MAR 13 PY 1994 VL 207 BP 134 EP COMP PN 1 PG 0 WC Chemistry, Multidisciplinary SC Chemistry GA MY954 UT WOS:A1994MY95401851 ER PT J AU GROSHENS, TJ GEDRIDGE, RW LOWEMA, CK AF GROSHENS, TJ GEDRIDGE, RW LOWEMA, CK TI PREPARATION OF SB AND BI CHALCOGENIDE MATERIALS VIA TRIMETHYLSILYL ELIMINATION-REACTIONS SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 USN,CTR WARFARE,DIV WEAP,RES DEPT,DIV CHEM,CHINA LAKE,CA 93555. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD MAR 13 PY 1994 VL 207 BP 138 EP COLL PN 1 PG 0 WC Chemistry, Multidisciplinary SC Chemistry GA MY954 UT WOS:A1994MY95401589 ER PT J AU LINDSAY, GA HERMAN, WN ASHLEY, PR LEE, CYC AF LINDSAY, GA HERMAN, WN ASHLEY, PR LEE, CYC TI APPLICATIONS FOR POLYMERIC NONLINEAR OPTICS IN THE MILITARY SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 USAF,AFOSR AFMC,BOLLING AFB,DC. USN,NAWCWPNS,CHINA LAKE,CA 93555. USN,NAWCAD,WARMINSTER,PA 18974. USA,MISSILE RES & DEV COMMAND,REDSTONE ARSENAL,AL 35809. 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 MAR 13 PY 1994 VL 207 BP 156 EP IEC PN 1 PG 0 WC Chemistry, Multidisciplinary SC Chemistry GA MY954 UT WOS:A1994MY95402702 ER PT J AU BRENNER, DW TUPPER, KJ SINNOTT, SB COLTON, RJ HARRISON, JA AF BRENNER, DW TUPPER, KJ SINNOTT, SB COLTON, RJ HARRISON, JA TI STRUCTURE, ENERGY-DISSIPATION, AND NONADHESIVE FRICTION - COMPUTER-SIMULATIONS OF SLIDING DIAMOND INTERFACES AND SELF-ASSEMBLED MONOLAYERS SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 USN,RES LAB,WASHINGTON,DC 20375. USN ACAD,DEPT CHEM,ANNAPOLIS,MD 21402. RI Brenner, Donald/D-1741-2009; Sinnott, Susan/P-8523-2014 OI Sinnott, Susan/0000-0002-3598-0403 NR 0 TC 1 Z9 1 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 MAR 13 PY 1994 VL 207 BP 166 EP COLL PN 1 PG 0 WC Chemistry, Multidisciplinary SC Chemistry GA MY954 UT WOS:A1994MY95401617 ER PT J AU GEORGE, RD SNOW, AW AF GEORGE, RD SNOW, AW TI SYNTHESIS AND CHARACTERIZATION OF 3-NITROPHTHALONITRILE SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 USN,RES LAB,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 MAR 13 PY 1994 VL 207 BP 166 EP ORGN PN 2 PG 0 WC Chemistry, Multidisciplinary SC Chemistry GA MY955 UT WOS:A1994MY95500243 ER PT J AU NGAI, KL COLMENERO, J ARBE, A AF NGAI, KL COLMENERO, J ARBE, A TI TEMPERATURE-DEPENDENCE OF THE LENGTH SCALE OF LOCAL SEGMENTAL MOTION IN PVC FROM DIELECTRIC MEASUREMENTS SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 UNIV BASQUE COUNTRY, DEPT FIS MAT, E-20080 SAN SEBASTIAN, SPAIN. USN, RES LAB, WASHINGTON, DC 20375 USA. RI Arbe, Arantxa/G-8178-2015; Colmenero, Juan/G-8725-2015 OI Arbe, Arantxa/0000-0002-5137-4649; Colmenero, Juan/0000-0002-2440-4953 NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD MAR 13 PY 1994 VL 207 BP 192 EP PMSE PN 2 PG 0 WC Chemistry, Multidisciplinary SC Chemistry GA MY955 UT WOS:A1994MY95501651 ER PT J AU ROLAND, CM NGAI, KL AF ROLAND, CM NGAI, KL TI CONSTRAINT DYNAMICS AND CHEMICAL-STRUCTURE 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 MAR 13 PY 1994 VL 207 BP 194 EP PMSE PN 2 PG 0 WC Chemistry, Multidisciplinary SC Chemistry GA MY955 UT WOS:A1994MY95501653 ER PT J AU AVAKIAN, P STARKWEATHER, HW FONTANELLA, JJ WINTERSGILL, MC AF AVAKIAN, P STARKWEATHER, HW FONTANELLA, JJ WINTERSGILL, MC TI THE DIELECTRIC-PROPERTIES OF FLUOROPOLYMERS SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 DUPONT CO INC,CENT RES & DEV EXPTL STN,WILMINGTON,DE 19880. USN ACAD,DEPT PHYS,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 MAR 13 PY 1994 VL 207 BP 233 EP PMSE PN 2 PG 0 WC Chemistry, Multidisciplinary SC Chemistry GA MY955 UT WOS:A1994MY95501692 ER PT J AU HICKMAN, JJ FOSTER, KE STENGER, DA SCHAFFNER, AE BARKER, JL AF HICKMAN, JJ FOSTER, KE STENGER, DA SCHAFFNER, AE BARKER, JL TI BIOLOGICAL INTERFACE DESIGN TO CONTROL PROTEIN ADSORPTION SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 SCI APPLICAT INT CORP,MCLEAN,VA 22102. USN,RES LAB,CTR BIOMOLEC SCI & ENGN,WASHINGTON,DC 20375. NINCDS,DIR,BNP,NEUROPHYSIOL LAB,BETHESDA,MD 20892. 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 MAR 13 PY 1994 VL 207 BP 244 EP COLL PN 1 PG 0 WC Chemistry, Multidisciplinary SC Chemistry GA MY954 UT WOS:A1994MY95401694 ER PT J AU HECKENDORN, DK AF HECKENDORN, DK TI CONFORMATIONAL-ANALYSIS AND NMR-SPECTROSCOPY 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 MAR 13 PY 1994 VL 207 BP 274 EP ORGN PN 2 PG 0 WC Chemistry, Multidisciplinary SC Chemistry GA MY955 UT WOS:A1994MY95500351 ER PT J AU LOMAX, JF AF LOMAX, JF TI CONDUCTING MIDSHIPMEN - A DEMONSTRATION OF CHARGE MOVEMENT 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 MAR 13 PY 1994 VL 207 BP 283 EP INOR PN 1 PG 0 WC Chemistry, Multidisciplinary SC Chemistry GA MY954 UT WOS:A1994MY95403044 ER PT J AU BERRY, A PURDY, A AF BERRY, A PURDY, A TI SYNTHESIS AND CHARACTERIZATION OF ALKALINE-EARTH THIOLATES AND DITHIOCARBAMATES SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 USN,RES LAB,DIV CHEM,WASHINGTON,DC 20375. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD MAR 13 PY 1994 VL 207 BP 294 EP INOR PN 1 PG 0 WC Chemistry, Multidisciplinary SC Chemistry GA MY954 UT WOS:A1994MY95403055 ER PT J AU WEIMER, WA REEVE, SW AF WEIMER, WA REEVE, SW TI PROBING MOLECULAR PROCESSES IN A DC ARCJET DIAMOND CHEMICAL-VAPOR-DEPOSITION REACTOR SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 USN,CTR AIR WARFARE,DEPT RES,DIV CHEM,CHINA LAKE,CA 93555. NR 2 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 MAR 13 PY 1994 VL 207 BP 306 EP PHYS PN 2 PG 0 WC Chemistry, Multidisciplinary SC Chemistry GA MY955 UT WOS:A1994MY95500942 ER PT J AU PURDY, AP LOWEMA, C AF PURDY, AP LOWEMA, C TI SYNTHESIS OF TERNARY SULFIDES BY THERMOLYSIS OF COPRECIPITATED PRECURSORS SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 USN,RES LAB,WASHINGTON,DC 20375. NAWCWPNS,DIV CHEM,CHINA LAKE,CA 93555. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD MAR 13 PY 1994 VL 207 BP 376 EP INOR PN 1 PG 0 WC Chemistry, Multidisciplinary SC Chemistry GA MY954 UT WOS:A1994MY95403136 ER PT J AU ERICKSON, MS MILLIKEN, J GEORGE, CF AF ERICKSON, MS MILLIKEN, J GEORGE, CF TI SYNTHESIS OF BENZONAPHTHOCHRYSENE - IN SEARCH OF POTENTIAL PRECURSORS TO FULLERENES SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 USN,RES LAB,DIV CHEM,WASHINGTON,DC 20375. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD MAR 13 PY 1994 VL 207 BP 378 EP ORGN PN 2 PG 0 WC Chemistry, Multidisciplinary SC Chemistry GA MY955 UT WOS:A1994MY95500454 ER PT J AU RIZOS, AK HADJICHRISTIDIS, N PISPAS, S NGAI, KL AF RIZOS, AK HADJICHRISTIDIS, N PISPAS, S NGAI, KL TI MODIFICATION OF SOLVENT RELAXATION DYNAMICS IN BLOCK-COPOLYMER SOLUTIONS SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 RES CTR CRETE,GR-71409 IRAKLION,GREECE. USN,RES LAB,WASHINGTON,DC 20375. RI Rizos, Apostolos/F-6807-2011 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 MAR 13 PY 1994 VL 207 BP 385 EP POLY PN 2 PG 0 WC Chemistry, Multidisciplinary SC Chemistry GA MY955 UT WOS:A1994MY95501416 ER PT J AU SINGH, A TSAO, LI PURANIK, DB AF SINGH, A TSAO, LI PURANIK, DB TI SYNTHESIS AND CHARACTERIZATION OF METAL-CHELATING POLYMERIZABLE 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 MAR 13 PY 1994 VL 207 BP 432 EP ORGN PN 2 PG 0 WC Chemistry, Multidisciplinary SC Chemistry GA MY955 UT WOS:A1994MY95500508 ER PT J AU LOMAX, JF AF LOMAX, JF TI KINETIC CLASSROOM - CLASSROOM DEMONSTRATIONS WITH STUDENT MOVEMENT 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 MAR 13 PY 1994 VL 207 BP 454 EP CHED PN 1 PG 0 WC Chemistry, Multidisciplinary SC Chemistry GA MY954 UT WOS:A1994MY95401286 ER PT J AU OLSON, PE TORP, EC MAHON, RT WEISS, PJ WALLACE, MR AF OLSON, PE TORP, EC MAHON, RT WEISS, PJ WALLACE, MR TI ORAL VITAMIN-E FOR REFRACTORY HAND DERMATITIS SO LANCET LA English DT Letter C1 USN,MED CTR,DEPT DERMATOL,SAN DIEGO,CA 92134. USN,MED CTR,DEPT CLIN INVEST,SAN DIEGO,CA 92134. RP OLSON, PE (reprint author), USN,MED CTR,DEPT INTERNAL MED,DIV INFECT DIS,SAN DIEGO,CA 92134, USA. NR 5 TC 1 Z9 1 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 MAR 12 PY 1994 VL 343 IS 8898 BP 672 EP 673 DI 10.1016/S0140-6736(94)92666-2 PG 2 WC Medicine, General & Internal SC General & Internal Medicine GA NA093 UT WOS:A1994NA09300041 PM 7906831 ER PT J AU SKELTON, EF DREWS, AR OSOFSKY, MS QADRI, SB HU, JZ VANDERAH, TA PENG, JL GREENE, RL AF SKELTON, EF DREWS, AR OSOFSKY, MS QADRI, SB HU, JZ VANDERAH, TA PENG, JL GREENE, RL TI DIRECT OBSERVATION OF MICROSCOPIC INHOMOGENEITIES WITH ENERGY-DISPERSIVE DIFFRACTION OF SYNCHROTRON-PRODUCED X-RAYS SO SCIENCE LA English DT Article ID SINGLE-CRYSTALS; ND2-XCEXCUO4-Y; GROWTH AB Evidence of structural inhomogeneities in two high-transition-temperature superconductors, YBa2CU3O7-delta and Nd2-xCexCuO4-y, is presented. When samples were illuminated by highly collimated x-rays produced on a synchrotron wiggler, small changes in the lattice were detected over a spatial scale of 10 micrometers. These changes are interpreted as evidence of variations in the oxygen content in one case and in the cerium content in the other; both affect the superconducting properties. The existence of such structural inhomogeneities brings into question whether exotic experimental results obtained from superconducting materials with high transition temperatures actually reflect intrinsic properties. C1 USN,RES LAB,DIV MAT SCI & TECHNOL,WASHINGTON,DC 20375. CARNEGIE INST WASHINGTON,GEOPHYS LAB,WASHINGTON,DC 20015. CARNEGIE INST WASHINGTON,CTR HIGH PRESSURE RES,WASHINGTON,DC 20015. USN,CTR AIR WARFARE,RES DEPT,DIV CHEM,CHINA LAKE,CA 93555. UNIV MARYLAND,DEPT CHEM,CTR SUPERCONDUCT RES,COLL PK,MD 20742. RP SKELTON, EF (reprint author), USN,RES LAB,DIV CONDENSED MATTER & RADIAT SCI,WASHINGTON,DC 20375, USA. RI Osofsky, Michael/A-1050-2010 NR 10 TC 31 Z9 31 U1 0 U2 0 PU AMER ASSOC ADVANCEMENT SCIENCE PI WASHINGTON PA 1200 NEW YORK AVE, NW, WASHINGTON, DC 20005 SN 0036-8075 J9 SCIENCE JI Science PD MAR 11 PY 1994 VL 263 IS 5152 BP 1416 EP 1418 DI 10.1126/science.263.5152.1416 PG 3 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA MZ927 UT WOS:A1994MZ92700024 PM 17776512 ER PT J AU ROUMELIOTIS, G STURROCK, PA ANTIOCHOS, SK AF ROUMELIOTIS, G STURROCK, PA ANTIOCHOS, SK TI A NUMERICAL STUDY OF THE SUDDEN ERUPTION OF SHEARED MAGNETIC-FIELDS SO ASTROPHYSICAL JOURNAL LA English DT Article DE MHD; SUN, CORONA; SUN, FLARES; SUN, MAGNETIC FIELDS AB We investigate the quasi-static evolution of an idealized magnetic configuration in the solar corona that is subjected to photospheric shearing motions. The initial, unsheared field in our calculations is a magnetic dipole located at the center of the Sun. The assumed photospheric shearing motions are latitude-dependent and antisymmetric about the equator. The quasi-static evolution of the coronal field is calculated using the magneto-frictional method. A key difference between our study and previous work is that the outer computational boundary is placed exceedingly far from the solar surface where the shearing motions are applied. This is achieved by writing the basic equations of the magneto-frictional method in terms of the logarithm of radial distance. We find that initially, the coronal magnetic field expands steadily as the footpoint displacement is increased. However, when the footpoint displacement exceeds a certain critical amount, the qualitative behavior of the evolving field suddenly changes, so that the outward expansion of the field lines becomes a much more rapidly increasing function of the footpoint displacement. We propose that this sudden transition to a regime with very sensitive dependence on boundary conditions plays an important role in the onset of eruptive phenomena in the solar atmosphere. C1 USN,RES LAB,WASHINGTON,DC 20375. RP ROUMELIOTIS, G (reprint author), STANFORD UNIV,CTR SPACE SCI & ASTROPHYS,STANFORD,CA 94305, USA. RI Antiochos, Spiro/D-4668-2012 OI Antiochos, Spiro/0000-0003-0176-4312 NR 16 TC 31 Z9 32 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 1994 VL 423 IS 2 BP 847 EP 853 DI 10.1086/173862 PN 1 PG 7 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA NA095 UT WOS:A1994NA09500032 ER PT J AU KULKARNI, SR FRAIL, DA KASSIM, NE MURAKAMI, T VASISHT, G AF KULKARNI, SR FRAIL, DA KASSIM, NE MURAKAMI, T VASISHT, G TI THE RADIO NEBULA OF THE SOFT GAMMA-RAY REPEATER 1806-20 SO NATURE LA English DT Article ID HIGH-ENERGY TRANSIENT; SUPERNOVA-REMNANTS; PULSARS; STARS AB AN important clue to the nature of soft gamma-ray repeaters (SGRs), which emit recurrent bursts of gamma-rays, has been provided by the association of two of the three known SGRs with supernova remnants(1,2) (SNRs). Here we present radio images of the nonthermal radio nebula G10.0-0.3, a supernova remnant which has been associated previously(2) with SGR1806-20 (refs 3, 4). Our images show that the nebula is a plerion (that is, the radio emission is synchrotron radiation powered by a central pulsar), as revealed by the observation of a hierarchy of nested shells and a bright central peak. The recent detection(5) of an X-ray point source coincident with the radio peak and of a hard X-ray burst(5,6) from G10.0-0.3 confirms the SGR-SNR association. We propose that SGR1806-20 is an isolated pulsar that emits both steady and impulsive winds of relativistic particles, which together power the nebula. We suggest that the offset from the centres of the SNRs observed for both this object and SGR0526-66 (ref. 1), requiring high velocities of the pulsars, provides a clue to their formation mechanism. C1 NATL RADIO ASTRON OBSERV,SOCORRO,NM 87801. USN,RES LAB,DIV REMOTE SENSING,WASHINGTON,DC 20375. INST SPACE & ASTRONAUT SCI,SAGAMIHARA,KANAGAWA 229,JAPAN. RP KULKARNI, SR (reprint author), CALTECH,DIV PHYS MATH & ASTRON 10524,PASADENA,CA 91125, USA. NR 22 TC 100 Z9 99 U1 0 U2 1 PU MACMILLAN MAGAZINES LTD PI LONDON PA PORTERS SOUTH, 4 CRINAN ST, LONDON, ENGLAND N1 9XW SN 0028-0836 J9 NATURE JI Nature PD MAR 10 PY 1994 VL 368 IS 6467 BP 129 EP 131 DI 10.1038/368129a0 PG 3 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA NA030 UT WOS:A1994NA03000059 ER PT J AU PUVVADA, S BARAL, S CHOW, GM QADRI, SB RATNA, BR AF PUVVADA, S BARAL, S CHOW, GM QADRI, SB RATNA, BR TI SYNTHESIS OF PALLADIUM METAL NANOPARTICLES IN THE BICONTINUOUS CUBIC PHASE OF GLYCEROL MONOOLEATE SO JOURNAL OF THE AMERICAN CHEMICAL SOCIETY LA English DT Note ID WATER C1 USN,RES LAB,CTR BIOMOLEC SCI & ENGN,WASHINGTON,DC 20375. USN,RES LAB,DIV CONDENSED MATTER & RADIAT,WASHINGTON,DC 20375. UNIV COLORADO,DEPT CHEM & BIOCHEM,BOULDER,CO 80309. GEOCENTERS INC,FT WASHINGTON,MD. GEORGETOWN UNIV,MED CTR,DEPT BIOCHEM,WASHINGTON,DC 20007. NR 14 TC 49 Z9 49 U1 0 U2 6 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 MAR 9 PY 1994 VL 116 IS 5 BP 2135 EP 2136 DI 10.1021/ja00084a060 PG 2 WC Chemistry, Multidisciplinary SC Chemistry GA NB169 UT WOS:A1994NB16900060 ER PT J AU BEADLE, C LONG, GW WEISS, WR MCELROY, PD MARET, SM OLOO, AJ HOFFMAN, SL AF BEADLE, C LONG, GW WEISS, WR MCELROY, PD MARET, SM OLOO, AJ HOFFMAN, SL TI DIAGNOSIS OF MALARIA BY DETECTION OF PLASMODIUM-FALCIPARUM HRP-2 ANTIGEN WITH A RAPID DIPSTICK ANTIGEN-CAPTURE ASSAY SO LANCET LA English DT Article ID HISTIDINE-RICH PROTEINS; RADIOIMMUNOASSAY AB Two field studies in Kenya and an experimental challenge study in the USA were done to assess the accuracy of a dipstick antigen-capture assay based on qualitative detection of Plasmodium falciparum histidine-rich protein 2 (PfHRP-2) in peripheral blood for diagnosis of P fafciparum infection. In these studies, the assay was 96.5-100% sensitive for detection of greater than 60 P falciparum asexual parasites/ mu L blood, 70-81% sensitive for 11-60 parasites/mu L blood, and 11-67% sensitive for 10 parasites or less/mu L blood. Specificity was 95% (95% CI 85-105%; n = 20) among naive American volunteers, 98% (96-101%; n=112) among volunteers exposed to the bite of P falciparium-infected mosquitoes, and 88% (84-92%; n=285) among Kenyans living in an area with holoendemic malaria. Our results also indicated that PfHRP-2 antigen was not detectable in blood 6 days after initiation of curative chemotherapy, and suggest that such circulating antigens rarely lead to false-positive tests. The dipstick assay's sensitivity, specificity, simplicity, and speed may make it an important tool in the battle against malaria. C1 USN,MED RES INST,MALARIA PROGRAM,ROCKVILLE,MD 20852. JOHNS HOPKINS UNIV,SCH HYG & PUBL HLTH,BALTIMORE,MD. USN,NAVAL MED RES INSST DETACHMENT,KISUMU,KENYA. USA,ARMY MED RES UNIT,KISUMU,KENYA. BECTON DICKINSON CO,DIV ADV DIAGNOST,BALTIMORE,MD. KENYA GOVT MED RES CTR,VECTOR BIOL & CONTROL CLIN RES CTR,KISUMU,KENYA. NR 12 TC 201 Z9 214 U1 0 U2 14 PU LANCET LTD PI LONDON PA 42 BEDFORD SQUARE, LONDON, ENGLAND WC1B 3SL SN 0140-6736 J9 LANCET JI Lancet PD MAR 5 PY 1994 VL 343 IS 8897 BP 564 EP 568 DI 10.1016/S0140-6736(94)91520-2 PG 5 WC Medicine, General & Internal SC General & Internal Medicine GA MY843 UT WOS:A1994MY84300008 PM 7906328 ER PT J AU VOHRA, ST FABINY, L AF VOHRA, ST FABINY, L TI MIXING AND DETECTION OF MICROWAVE SIGNALS IN FIBEROPTIC ELECTROSTRICTIVE SENSOR SO ELECTRONICS LETTERS LA English DT Article DE PIEZOELECTRIC DEVICES; FIBER OPTIC SENSORS; MICROWAVE TECHNIQUES ID ELECTRIC-FIELD SENSOR AB The nonlinear strain-polarisation relationship in electrostrictive ceramics is exploited to demonstrate, for the first time, detection and mixing of microwave signals in a fibre-optic electrostrictive sensor. The nonlinear electrostrictive transducer mixes the microwave signa with a signal from a local oscillator, and the resulting strain at the intermediate frequency is detected with a fibre-optic interferometer. The sensor demonstrated approximately flat response in the microwave regime (up to 20 GHz) with a resolution of 5 x 10(-6) V/square-root Hz. RP VOHRA, ST (reprint author), USN,RES LAB,DIV OPT SCI,CODE 5670,WASHINGTON,DC 20375, USA. NR 9 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 3 PY 1994 VL 30 IS 5 BP 444 EP 445 DI 10.1049/el:19940301 PG 2 WC Engineering, Electrical & Electronic SC Engineering GA ND755 UT WOS:A1994ND75500050 ER PT J AU BERMUDEZ, VM AF BERMUDEZ, VM TI STUDY OF THE ADSORPTION OF TRIETHYLGALLIUM, AMMONIA, AND HYDRAZINE ON MGO(100) USING INFRARED REFLECTION-ABSORPTION SPECTROSCOPY SO JOURNAL OF PHYSICAL CHEMISTRY LA English DT Article ID CHEMICAL VAPOR-DEPOSITION; ENERGY-LOSS-SPECTROSCOPY; ULTRATHIN MGO FILMS; OPTICAL-PROPERTIES; GAN; GROWTH; MO(100); SURFACE; N2H4; NH3 AB Infrared reflection absorption spectroscopy has been used to study the adsorption and coadsorption of Ga-(C2H5)(3) (TEG), NH3, and N2H4 at 120-160 K on MgO films grown epitaxially on Mo(100). All three species adsorb molecularly and, upon warming, desorb without leaving any residue detectable by Auger spectroscopy. At submonolayer coverage, NH3 and N2H4 adsorb in well-defined geometries. NH3 adsorbs via an Mg-N bond normal to the surface, and N2H4 is suggested to adsorb with one NH2 forming an Mg-N bond and the other H-bonded to an oxide ion. Evidence is also found for relatively strong TEG-MgO bonding. Exposure of preadsorbed TEG to NH3 yields a TEG-NH3 adduct, whereas the reverse sequence does not displace NH3 from the MgO surface. Preadsorbed N2H4 bonded to the MgO surface reacts immediately upon exposure to TEG. In contrast, preadsorbed TEG bonded to MgO does not react with N2H4 but, instead, inhibits crystallization of the N2H4 overlayer. The interaction within condensed, coadsorbed multilayers of TEG and N2H4 is more complicated but, with mild annealing, ends in reaction, most likely the formation of an adduct. RP BERMUDEZ, VM (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 64 TC 7 Z9 7 U1 0 U2 4 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0022-3654 J9 J PHYS CHEM-US JI J. Phys. Chem. PD MAR 3 PY 1994 VL 98 IS 9 BP 2469 EP 2477 DI 10.1021/j100060a040 PG 9 WC Chemistry, Physical SC Chemistry GA MZ513 UT WOS:A1994MZ51300040 ER PT J AU BRADY, RF AF BRADY, RF TI POLYMER CHEMISTRY - COMING TO AN UNSTICKY END SO NATURE LA English DT Editorial Material RP BRADY, RF (reprint author), USN,RES LAB,COATINGS SECT,WASHINGTON,DC 20375, USA. NR 6 TC 28 Z9 28 U1 1 U2 3 PU MACMILLAN MAGAZINES LTD PI LONDON PA PORTERS SOUTH, 4 CRINAN ST, LONDON, ENGLAND N1 9XW SN 0028-0836 J9 NATURE JI Nature PD MAR 3 PY 1994 VL 368 IS 6466 BP 16 EP 17 DI 10.1038/368016a0 PG 2 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA MY569 UT WOS:A1994MY56900030 ER PT J AU METZBOWER, E AF METZBOWER, E TI JOINING DIVISION SO ADVANCED MATERIALS & PROCESSES LA English DT Article RP METZBOWER, E (reprint author), USN,RES LAB,WELDING MET SECT,WASHINGTON,DC 20375, USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU ASM INTERNATIONAL PI MATERIALS PARK PA SUBSCRIPTIONS SPECIALIST CUSTOMER SERVICE, MATERIALS PARK, OH 44073-0002 SN 0026-0665 J9 ADV MATER PROCESS JI Adv. Mater. Process. PD MAR PY 1994 VL 145 IS 3 BP 45 EP 45 PG 1 WC Materials Science, Multidisciplinary SC Materials Science GA NG655 UT WOS:A1994NG65500013 ER PT J AU CHANDRASEKHARA, MS CARR, LW WILDER, MC AF CHANDRASEKHARA, MS CARR, LW WILDER, MC TI INTERFEROMETRIC INVESTIGATIONS OF COMPRESSIBLE DYNAMIC STALL OVER A TRANSIENTLY PITCHING AIRFOIL SO AIAA JOURNAL LA English DT Article; Proceedings Paper CT AIAA 31st Aerospace Sciences Meeting CY JAN 11-14, 1993 CL RENO, NV SP AMER INST AERONAUT & ASTRONAUT ID CONSTANT-RATE; MOTIONS AB The compressible dynamic stall flowfield over a NACA 0012 airfoil transiently pitching from 0 to 60 deg at a constant rate under compressible flow conditions has been studied using real-time interferometry. A quantitative description of the overall flowfield, including the finer details of dynamic stall vortex formation, growth, and the concomitant changes in the airfoil pressure distribution, has been provided by analyzing the interferograms. For Mach numbers above 0.4, small multiple shocks appear near the leading edge and are present through the initial stages of dynamic stall. Dynamic stall was found to occur coincidentally with the bursting of the separation bubble over the airfoil. Compressibility was found to confine the dynamic stall vortical structure closer to the airfoil surface. The measurements show that the peak suction pressure coefficient drops with increasing freestream Mach number, and also it lags the steady now values at any given angle of attack. As the dynamic stall vortex is shed, an anti-clockwise vortex is induced near the trailing edge, which actively interacts with the post-stall flow. C1 NAVAL POSTGRAD SCH,MONTEREY,CA 93943. MCAT INST,SAN JOSE,CA 95127. RP CHANDRASEKHARA, MS (reprint author), NASA,AMES RES CTR,JOINT INST AERONAUT,DEPT AERONAUT & ASTRONAUT,MS 260-1,MOFFETT FIELD,CA 94035, USA. NR 17 TC 12 Z9 12 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 MAR PY 1994 VL 32 IS 3 BP 586 EP 593 DI 10.2514/3.12025 PG 8 WC Engineering, Aerospace SC Engineering GA MY520 UT WOS:A1994MY52000019 ER PT J AU SAPRKAYA, T NEUBERT, DE AF SAPRKAYA, T NEUBERT, DE TI INTERACTION OF A STREAMWISE VORTEX WITH A FREE-SURFACE SO AIAA JOURNAL LA English DT Article; Proceedings Paper CT AIAA 31st Aerospace Sciences Meeting CY JAN 11-14, 1993 CL RENO, NV SP AMER INST AERONAUT & ASTRONAUT ID TURBULENCE STRUCTURE; FLOW; VORTICES AB An experimental investigation on the flow structure resulting from the interaction of a single tip vortex with a deformable free surface is described. The results have-shown that the free surface redistributes part or all of the normal turbulent kinetic energy into streamwise and spanwise components. The turbulent kinetic energy first decreases sharply with increasing vertical distance from the vortex and then remains nearly constant within a thin layer below the ''roughened'' free surface. The results lend further credence to the simulation of near-surface structures by a decaying two-dimensional turbulence vis vortex or contour dynamics. RP SAPRKAYA, T (reprint author), NAVAL POSTGRAD SCH,MONTEREY,CA 93943, USA. NR 22 TC 10 Z9 10 U1 0 U2 1 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 MAR PY 1994 VL 32 IS 3 BP 594 EP 600 DI 10.2514/3.12026 PG 7 WC Engineering, Aerospace SC Engineering GA MY520 UT WOS:A1994MY52000020 ER PT J AU LOVE, RW AF LOVE, RW TI BRITISH INTELLIGENCE IN THE 2ND-WORLD-WAR - HINSLEY,FH SO ALBION LA English DT Book Review RP LOVE, RW (reprint author), USN ACAD,ANNAPOLIS,MD 21402, USA. NR 1 TC 0 Z9 0 U1 0 U2 0 PU APPALACHIAN STATE UNIV PI BOONE PA ALBION/HISTORY DEPT 210 WHITENER HALL, BOONE, NC 28608 SN 0095-1390 J9 ALBION JI Albion PD SPR PY 1994 VL 26 IS 1 BP 200 EP 201 DI 10.2307/4052156 PG 2 WC History SC History GA PB828 UT WOS:A1994PB82800064 ER PT J AU ROSENFELD, P GIACALONE, RA RIORDAN, CA AF ROSENFELD, P GIACALONE, RA RIORDAN, CA TI IMPRESSION MANAGEMENT THEORY AND DIVERSITY - LESSONS FOR ORGANIZATIONAL-BEHAVIOR SO AMERICAN BEHAVIORAL SCIENTIST LA English DT Article C1 USN,PERSONNEL RES & DEV CTR,MARINE CORP EQUAL OPPORTUN SURVEY,SAN DIEGO,CA 92132. CALIF SCH PROFESS PSYCHOL,SAN DIEGO,CA. UNIV RICHMOND,E CLAIBORNE ROBINS SCH BUSINESS,RICHMOND,VA 23173. UNIV MISSOURI,MANAGEMENT SYST PROGRAM,ROLLA,MO 65401. RP ROSENFELD, P (reprint author), USN,PERSONNEL RES & DEV CTR,SAN DIEGO,CA 92132, USA. NR 14 TC 8 Z9 8 U1 1 U2 6 PU SAGE PUBLICATIONS INC PI THOUSAND OAKS PA 2455 TELLER RD, THOUSAND OAKS, CA 91320 SN 0002-7642 J9 AM BEHAV SCI JI Am. Behav. Sci. PD MAR-APR PY 1994 VL 37 IS 5 BP 601 EP 604 DI 10.1177/0002764294037005002 PG 4 WC Psychology, Clinical; Social Sciences, Interdisciplinary SC Psychology; Social Sciences - Other Topics GA MX579 UT WOS:A1994MX57900001 ER PT J AU ROSENFELD, P BOOTHKEWLEY, S EDWARDS, JE ALDERTON, DL AF ROSENFELD, P BOOTHKEWLEY, S EDWARDS, JE ALDERTON, DL TI LINKING DIVERSITY AND IMPRESSION MANAGEMENT - A STUDY OF HISPANIC, BLACK, AND WHITE NAVY RECRUITS SO AMERICAN BEHAVIORAL SCIENTIST LA English DT Article ID SOCIAL DESIRABILITY; COMPUTER C1 USN,PERSONNEL RES & DEV CTR,MARINE CORP EQUAL OPPORTUN SURVEY,SAN DIEGO,CA 92132. CALIF SCH PROFESS PSYCHOL,SAN DIEGO,CA. CTR DIS CONTROL & PREVENT,ATLANTA,GA. RP ROSENFELD, P (reprint author), USN,PERSONNEL RES & DEV CTR,SAN DIEGO,CA 92132, USA. NR 27 TC 10 Z9 10 U1 3 U2 4 PU SAGE PUBLICATIONS INC PI THOUSAND OAKS PA 2455 TELLER RD, THOUSAND OAKS, CA 91320 SN 0002-7642 J9 AM BEHAV SCI JI Am. Behav. Sci. PD MAR-APR PY 1994 VL 37 IS 5 BP 672 EP 681 DI 10.1177/0002764294037005007 PG 10 WC Psychology, Clinical; Social Sciences, Interdisciplinary SC Psychology; Social Sciences - Other Topics GA MX579 UT WOS:A1994MX57900006 ER PT J AU HODGES, GF LENHARDT, TM COTELINGAM, JD AF HODGES, GF LENHARDT, TM COTELINGAM, JD TI BONE-MARROW INVOLVEMENT IN LARGE-CELL LYMPHOMA - PROGNOSTIC IMPLICATIONS OF DISCORDANT DISEASE SO AMERICAN JOURNAL OF CLINICAL PATHOLOGY LA English DT Article DE BONE MARROW LYMPHOMA; DISCORDANT BONE MARROW LYMPHOMA; DISCORDANT LYMPHOMA; LARGE-CELL LYMPHOMA ID NON-HODGKINS LYMPHOMAS; DIFFUSE HISTIOCYTIC LYMPHOMA; ONCOLOGY GROUP EXPERIENCE; CENTRAL NERVOUS-SYSTEM; COMPOSITE LYMPHOMA; UNDIFFERENTIATED LYMPHOMA; HISTOLOGIC PROGRESSION; LYMPHOCYTIC LYMPHOMA; MALIGNANT-LYMPHOMAS; FOLLICULAR LYMPHOMA AB Discordant lymphomas are those in which two different histologic subtypes of non-Hodgkin's lymphoma are present simultaneously in the same patient at two or more separate disease sites. Discordance usually involves a lower grade follicular lymphoma in one anatomic site and a higher grade diffuse lesion elsewhere. A common type of discordance is seen in patients with a primary diagnosis of diffuse large-cell lymphoma (DLCL) who demonstrate bone marrow involvement by a lower grade lesion, such as a small cleaved cell or mixed small cleaved and large cell lymphoma. This study was undertaken to assess retrospectively the clinical implications of such bone marrow involvement, as well as the possible biologic mechanisms. Of the 59 DLCL cases studied, 20 (33.9%) showed evidence of bone marrow involvement, 14 of which were discordant (70%). The most significant findings included the following: Overall treatment responses and survivals in discordant patients with predominantly small cleaved cells in the marrow were similar to those in patients with no marrow involvement (mean survivals, 47.7 and 49 months, respectively), and were significantly longer than in patients with concordant marrow involvement (mean survival, 13.1 months, P < .05). Patients with discordant marrow infiltrates composed of a mixed cell population tended to do as poorly as those with concordant involvement. No clear-cut pattern of relapse in discordant patients was found, but persistence of small cleaved cells in some was reminiscent of lower grade B-cell lesions. Other features associated with lower grade lesions included older age, Less incidence of central nervous system involvement, and lesser extent and proportion of marrow infiltration. Finally, in approximately half the cases with discordant involvement, lymphoma was present unilaterally, emphasizing the need to perform bilateral biopsies for staging. C1 USN,NATL MED CTR,DIV HEMATOPATHOL,BETHESDA,MD 20889. NR 42 TC 40 Z9 42 U1 0 U2 0 PU LIPPINCOTT-RAVEN PUBL PI PHILADELPHIA PA 227 EAST WASHINGTON SQ, PHILADELPHIA, PA 19106 SN 0002-9173 J9 AM J CLIN PATHOL JI Am. J. Clin. Pathol. PD MAR PY 1994 VL 101 IS 3 BP 305 EP 311 PG 7 WC Pathology SC Pathology GA NA122 UT WOS:A1994NA12200015 PM 8135186 ER PT J AU PEELER, DP AF PEELER, DP TI ENGENDERING CULTURE - MANHOOD AND WOMANHOOD IN NEW-DEAL PUBLIC ART AND THEATER - MELOSH,B SO AMERICAN QUARTERLY LA English DT Book Review RP PEELER, DP (reprint author), USN ACAD,ANNAPOLIS,MD 21402, USA. NR 1 TC 0 Z9 0 U1 0 U2 0 PU JOHNS HOPKINS UNIV PRESS PI BALTIMORE PA JOURNALS PUBLISHING DIVISION, 2715 NORTH CHARLES ST, BALTIMORE, MD 21218-4319 SN 0003-0678 J9 AM QUART JI Am. Q. PD MAR PY 1994 VL 46 IS 1 BP 107 EP 113 DI 10.2307/2713360 PG 7 WC Humanities, Multidisciplinary SC Arts & Humanities - Other Topics GA ND124 UT WOS:A1994ND12400015 ER PT J AU PEELER, DP AF PEELER, DP TI MAKING A NEW-DEAL - INDUSTRIAL-WORKERS IN CHICAGO, 1919-1939 - COHEN,L SO AMERICAN QUARTERLY LA English DT Book Review RP PEELER, DP (reprint author), USN ACAD,ANNAPOLIS,MD 21402, USA. NR 1 TC 0 Z9 0 U1 0 U2 0 PU JOHNS HOPKINS UNIV PRESS PI BALTIMORE PA JOURNALS PUBLISHING DIVISION, 2715 NORTH CHARLES ST, BALTIMORE, MD 21218-4319 SN 0003-0678 J9 AM QUART JI Am. Q. PD MAR PY 1994 VL 46 IS 1 BP 107 EP 113 DI 10.2307/2713360 PG 7 WC Humanities, Multidisciplinary SC Arts & Humanities - Other Topics GA ND124 UT WOS:A1994ND12400013 ER PT J AU PEELER, DP AF PEELER, DP TI COMMUNITY OF SUFFERING AND STRUGGLE - WOMEN, MEN AND THE LABOR-MOVEMENT IN MINNEAPOLIS, 1915-1945 - FAUE,E SO AMERICAN QUARTERLY LA English DT Book Review RP PEELER, DP (reprint author), USN ACAD,ANNAPOLIS,MD 21402, USA. NR 1 TC 0 Z9 0 U1 0 U2 0 PU JOHNS HOPKINS UNIV PRESS PI BALTIMORE PA JOURNALS PUBLISHING DIVISION, 2715 NORTH CHARLES ST, BALTIMORE, MD 21218-4319 SN 0003-0678 J9 AM QUART JI Am. Q. PD MAR PY 1994 VL 46 IS 1 BP 107 EP 113 DI 10.2307/2713360 PG 7 WC Humanities, Multidisciplinary SC Arts & Humanities - Other Topics GA ND124 UT WOS:A1994ND12400014 ER PT J AU PELLER, DP AF PELLER, DP TI LABOR AND DESIRE - WOMENS REVOLUTIONARY FICTION IN DEPRESSION AMERICA - RABINOWITZ,P SO AMERICAN QUARTERLY LA English DT Book Review RP PELLER, DP (reprint author), USN ACAD,ANNAPOLIS,MD 21402, USA. NR 1 TC 0 Z9 0 U1 0 U2 0 PU JOHNS HOPKINS UNIV PRESS PI BALTIMORE PA JOURNALS PUBLISHING DIVISION, 2715 NORTH CHARLES ST, BALTIMORE, MD 21218-4319 SN 0003-0678 J9 AM QUART JI Am. Q. PD MAR PY 1994 VL 46 IS 1 BP 107 EP 113 PG 7 WC Humanities, Multidisciplinary SC Arts & Humanities - Other Topics GA ND124 UT WOS:A1994ND12400016 ER PT J AU HUNTER, WR LONG, JP AF HUNTER, WR LONG, JP TI THIN-FILM INTERFERENCE MIRROR TO SUPPRESS GRATING HARMONICS IN VACUUM-ULTRAVIOLET RADIATION SO APPLIED OPTICS LA English DT Article ID GRAZING-INCIDENCE MONOCHROMATOR; SYNCHROTRON RADIATION; REJECTION; DEVICE; RANGE AB A thin-film reflecting interference filter has been designed and constructed for the purpose of suppressing grating harmonics when monochromatizing synchrotron radiation. It consists of a layer of Si evaporated onto a substrate and makes use of interference between wave fronts reflected from the layer-substrate and vacuum-layer interfaces to suppress higher harmonics. The filter has proved useful over the fundamental wavelength range of 400-1200 angstrom (approximately 30-10 eV), maintaining a rejection ratio of fundamental to second harmonic exceeding 60. Calculations and measurements are presented, and the reflecting interference filter is compared with a critical-angle mirror used for the same purpose. C1 USN, RES LAB, WASHINGTON, DC 20375 USA. RP HUNTER, WR (reprint author), SFA INC, 1401 MCCORMICK DR, LANDOVER, MD 20785 USA. NR 18 TC 5 Z9 8 U1 0 U2 1 PU OPTICAL SOC AMER PI WASHINGTON PA 2010 MASSACHUSETTS AVE NW, WASHINGTON, DC 20036 USA SN 0003-6935 J9 APPL OPTICS JI Appl. Optics PD MAR 1 PY 1994 VL 33 IS 7 BP 1264 EP 1269 PG 6 WC Optics SC Optics GA NB422 UT WOS:A1994NB42200022 PM 20862149 ER PT J AU REBBERT, M ISAACSON, P FISCHER, J GREENHOUSE, MA GROSSMAN, J PECKERAR, M SMITH, HA AF REBBERT, M ISAACSON, P FISCHER, J GREENHOUSE, MA GROSSMAN, J PECKERAR, M SMITH, HA TI MICROSTRUCTURE TECHNOLOGY FOR FABRICATION OF METAL-MESH GRIDS SO APPLIED OPTICS LA English DT Article DE FABRY-PEROT; FAR-INFRARED; METAL MESH; MICROSTRUCTURE TECHNOLOGY AB Motivated by the need for highly efficient far-IR Fabry-Perot etalons for airborne and space astronomy, we have developed a high-yield photolithographic technique for producing low-loss metal-mesh reflectors. We describe the production technique and report on the mesh flatness and uniformity. Optical measurements of meshes produced by this technique show that absorptivity of less than 1% with reflectivity of more than 98% was achieved at the longest wavelengths measured, which proved them to be significantly more efficient than commercially available meshes. This process can achieve wire widths that are less than the mesh thicknesses (typically 3 mum), which extends their applicability to wavelengths as short as approximately 20 mum without sacrificing mechanical strength for airborne and space-flight applications. C1 SMITHSONIAN INST, NATL AIR & SPACE MUSEUM, ASTROPHYS LAB, WASHINGTON, DC 20560 USA. SACHS FREEMAN ASSOCIATES INC, LANDOVER, MD 20785 USA. USN, RES LAB, DIV REMOTE SENSING, WASHINGTON, DC 20375 USA. RP REBBERT, M (reprint author), USN, RES LAB, DIV ELECTR SCI & TECHNOL, CODE 6804, WASHINGTON, DC 20375 USA. NR 12 TC 13 Z9 13 U1 0 U2 1 PU OPTICAL SOC AMER PI WASHINGTON PA 2010 MASSACHUSETTS AVE NW, WASHINGTON, DC 20036 USA SN 0003-6935 J9 APPL OPTICS JI Appl. Optics PD MAR 1 PY 1994 VL 33 IS 7 BP 1286 EP 1292 PG 7 WC Optics SC Optics GA NB422 UT WOS:A1994NB42200026 PM 20862153 ER PT J AU EVERSOLE, JD LIN, HB MERRITT, CD CAMPILLO, AJ AF EVERSOLE, JD LIN, HB MERRITT, CD CAMPILLO, AJ TI ABSORPTION-SPECTROSCOPY USING MICRODROPLET RESONANCE FLUORESCENCE INTENSITIES SO APPLIED SPECTROSCOPY LA English DT Article DE DROPLET ABSORBENCY; MICROCAVITY EMISSION; MDR AMPLITUDES; DROPLET PH ID STIMULATED RAMAN-SCATTERING; MORPHOLOGY-DEPENDENT RESONANCES; MICROMETER-SIZED DROPLETS; LIQUID DROPLETS; MIE SCATTERING; DIELECTRIC MICROSPHERES; ELASTIC-SCATTERING; EMISSION STRUCTURE; OPTICAL CAVITIES; SPECTRA AB Emission spectra from fluorophor-containing microdroplets exhibit a series of sharp peaks due to microcavity effects, superimposed on the usual broad-band dye emission seen in bulk liquid. The amplitudes of these resonance peaks are shown here to be sensitive absorption indicators, and the decrease in apparent resonance intensities may be used as a practical in situ absorption diagnostic procedure in spectroscopy. We illustrate this concept with two examples using a microdroplet stream (with diameters between 13 to 18 mum) of an ethanol/rhodamine dye solution, additionally doped with either bromocresol green or cresyl violet dye. An ability to obtain spectral absorption information, as well as quantitative absorption coefficient estimates in the range of 10 to 10(-3) cm-1, and to infer changes in pH in the droplets is demonstrated. Use of this approach in conjunction with suitable indicator dyes should permit measurement of specific chemical changes occurring in microdroplets. C1 USN,RES LAB,DIV OPT SCI,WASHINGTON,DC 20375. RP EVERSOLE, JD (reprint author), POTOMAC PHOTON INC,4445 NICOLE DR,LANHAM,MD 20706, USA. NR 37 TC 12 Z9 12 U1 0 U2 8 PU SOC APPLIED SPECTROSCOPY PI FREDERICK PA PO BOX 1438, FREDERICK, MD 21701 SN 0003-7028 J9 APPL SPECTROSC JI Appl. Spectrosc. PD MAR PY 1994 VL 48 IS 3 BP 373 EP 381 PG 9 WC Instruments & Instrumentation; Spectroscopy SC Instruments & Instrumentation; Spectroscopy GA ND172 UT WOS:A1994ND17200017 ER PT J AU KELLAND, DZ LEWIS, RF KUPKE, T AF KELLAND, DZ LEWIS, RF KUPKE, T TI SEX-DIFFERENCES ON 1ST AND 2ND ADMINISTRATIONS OF THE REPEATABLE COGNITIVE-PERCEPTUAL-MOTOR BATTERY SO ARCHIVES OF CLINICAL NEUROPSYCHOLOGY LA English DT Meeting Abstract C1 HENRY FORD HOSP,CTR FORENS PSYCHIAT,DETROIT,MI 48202. PORTSMOUTH USN HOSP,PORTSMOUTH,VA. NR 0 TC 1 Z9 1 U1 0 U2 1 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0887-6177 J9 ARCH CLIN NEUROPSYCH JI Arch. Clin. Neuropsychol. PD MAR-APR PY 1994 VL 9 IS 2 BP 148 EP 148 PG 1 WC Psychology, Clinical; Psychology SC Psychology GA NM848 UT WOS:A1994NM84800072 ER PT J AU FAIRCHILD, P COBB, MW AF FAIRCHILD, P COBB, MW TI A PAPULE ON THE FOREHEAD - PALISADED ENCAPSULATED NEUROMA SO ARCHIVES OF DERMATOLOGY LA English DT Note ID SKIN RP FAIRCHILD, P (reprint author), USN HOSP,BETHESDA,MD 20814, USA. NR 4 TC 0 Z9 1 U1 0 U2 0 PU AMER MEDICAL ASSOC PI CHICAGO PA 515 N STATE ST, CHICAGO, IL 60610 SN 0003-987X J9 ARCH DERMATOL JI Arch. Dermatol. PD MAR PY 1994 VL 130 IS 3 BP 369 EP & PG 0 WC Dermatology SC Dermatology GA ND877 UT WOS:A1994ND87700014 PM 8129419 ER PT J AU LITTLE, RD AF LITTLE, RD TI THE MACROECONOMIC DIMENSIONS OF ARMS REDUCTION - ADAMS,FG SO ARMED FORCES & SOCIETY LA English DT Book Review RP LITTLE, RD (reprint author), USN ACAD,DEPT ECON,ANNAPOLIS,MD 21402, USA. NR 1 TC 0 Z9 0 U1 0 U2 0 PU TRANSACTION PERIOD CONSORTIUM PI NEW BRUNSWICK PA DEPT 3091 RUTGERS-THE STATE UNIV OF NJ, NEW BRUNSWICK, NJ 08903 SN 0095-327X J9 ARMED FORCES SOC JI Armed Forces Soc. PD SPR PY 1994 VL 20 IS 3 BP 501 EP 503 DI 10.1177/0095327X9402000316 PG 3 WC Political Science; Sociology SC Government & Law; Sociology GA NM624 UT WOS:A1994NM62400015 ER PT J AU FRAIL, DA KASSIM, NE WEILER, KW AF FRAIL, DA KASSIM, NE WEILER, KW TI RADIO IMAGING OF 2 SUPERNOVA-REMNANTS CONTAINING PULSARS SO ASTRONOMICAL JOURNAL LA English DT Article ID GALACTIC PLANE; DISTANCE; ORIGIN AB The supernova remnants G 5.4-1.2 and G 8.7-0.1 each have a 15 000 yr old pulsar projected along their outside edges. If these are true pulsar-supernova remnant associations then the implied pulsar transverse motions for PSR1757-24 and PSR 1800-21 are excessively large ( 1500-2500 km s-1). We present new radio observations made at the VLA in the continuum at 327 MHz and the H i line at 1420 MHz to address this issue. For G 5.4-1.2 we better constrain the true extent of the remnant and its shape. We also derive an H I absorption distance and the spectral index distribution across the bright western side of the remnant. All the available evidence suggests that G 5.4-1.2 and PSR 1757-24 are associated. Our deep 327 MHz image of G 8.7-0.1 reveals faint extensions of the remnant but no new emission is seen near PSR 1800-21. A possible new supernova remnant is also discovered north of G 8.7-0.1. Several difficulties are presented for the proposed association between G 8.7-0.1 and PSR 1800-2 1, the most serious of which are the lack of a pulsar-powered nebula and the discrepant distance estimates for the pulsar and supernova remnant. We conclude that PSR 1800-21 is a foreground object, unrelated to G 8.7-0.1. C1 USN,RES LAB,DIV REMOTE SENSING,WASHINGTON,DC 20375. RP FRAIL, DA (reprint author), NATL RADIO ASTRON OBSERV,POB O,SOCORRO,NM 87801, USA. NR 42 TC 44 Z9 44 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 1994 VL 107 IS 3 BP 1120 EP & DI 10.1086/116923 PG 0 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA MZ128 UT WOS:A1994MZ12800025 ER PT J AU QUIRRENBACH, A BUSCHER, DF MOZURKEWICH, D HUMMEL, CA ARMSTRONG, JT AF QUIRRENBACH, A BUSCHER, DF MOZURKEWICH, D HUMMEL, CA ARMSTRONG, JT TI MAXIMUM-ENTROPY MAPS OF THE BE SHELL STAR ZETA-TAURI FROM OPTICAL LONG-BASE-LINE INTERFEROMETRY SO ASTRONOMY & ASTROPHYSICS LA English DT Letter DE TECHNIQUES, INTERFEROMETRIC; STARS, EMISSION LINE, BE; STARS, IMAGING; STARS, INDIVIDUAL, SIGMA-TAU; STARS, MASS-LOSS ID GAMMA-CASSIOPEIAE; ENVELOPE; LINE AB We present the. first maximum-entropy maps reconstructed from visibility amplitudes obtained with an optical long-baseline interferometer. They show the Be shell star zeta Tauri. In the continuum at 550 nm the star is an unresolved point source, whereas in the light of the Halpha line an extended, elongated structure is observed. The best-fit parameters of an elliptical Gaussian model are: major axis a = 3.55 +/- 0.33 mas, axial ratio r = 0.30 +/- 0.03, position angle phi = -59-degrees +/- 4-degrees. The morphology of the Halpha emission region is most easily interpreted as a disk seen almost edge-on; if this disk is axially symmetric, a limit for the inclination i less-than-or-equal-to 73-degrees can be derived. Our observations provide further evidence for the equatorial disk model of Be stars. C1 USN OBSERV, NRL, OPT INTERFEROMETER PROJECT, AD5, WASHINGTON, DC 20392 USA. UNIV SPACE RES ASSOC, WASHINGTON, DC 20024 USA. USN, RES LAB, DIV REMOTE SENSING, WASHINGTON, DC 20375 USA. RP MPI EXTRATERR PHYS, POSTFACH 1603, D-85748 GARCHING, GERMANY. NR 34 TC 49 Z9 49 U1 0 U2 0 PU EDP SCIENCES S A PI LES ULIS CEDEX A PA 17, AVE DU HOGGAR, PA COURTABOEUF, BP 112, F-91944 LES ULIS CEDEX A, FRANCE SN 1432-0746 J9 ASTRON ASTROPHYS JI Astron. Astrophys. PD MAR PY 1994 VL 283 IS 2 BP L13 EP L16 PG 4 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA NA377 UT WOS:A1994NA37700002 ER PT J AU NEDOLUHA, GE WATSON, WD AF NEDOLUHA, GE WATSON, WD TI INTENSITY-DEPENDENT CIRCULAR-POLARIZATION AND CIRCUMSTELLAR MAGNETIC-FIELDS FROM THE OBSERVATION OF SIO MASERS SO ASTROPHYSICAL JOURNAL LA English DT Article DE CIRCUMSTELLAR MATTER; MASERS; POLARIZATION ID LATE-TYPE STARS; ASTROPHYSICAL MASERS; LINEAR-POLARIZATION; ASTRONOMICAL MASERS; ABSORPTION-LINES; RADIATION; SPECTRA AB A new aspect of the propagation of astrophysical maser radiation in the presence of a magnetic field is described in which circular polarization is created. The resulting antisymmetric spectral line profile for this circular polarization resembles that produced by the ordinary Zeeman effect when the Zeeman splittings are much less than the spectral line breadth. It is caused by the change, with increasing maser intensity, in the axis of symmetry for the molecular quantum states from a direction that is parallel to the magnetic field to a direction that is parallel to the direction of propagation. When the maser is radiatively saturated, and the rate for stimulated emission is within an order of magnitude of the Zeeman splitting in frequency units, this ''intensity-dependent circular polarization'' is greater than that due to the ordinary Zeeman effect by factors as large as 1000. The circular polarization that is observed in the spectra of circumstellar SiO (J = 1-0) masers associated with late-type giants and supergiants may then be caused by magnetic fields as weak as about 10 mG. With the standard Zeeman interpretation of the observations, magnetic fields of 10-100 G are indicated. The lower fields are similar to the limits obtained from the observation of the 22 GHz water masers which are typically somewhat further from the central star. The observed tendency for the fractional linear polarization of SiO masers to increase with increasing angular momentum of the molecular state is shown to be a likely result of anisotropic pumping. Errors are identified that invalidate a recent conflicting claim in the literature about the basic theory of maser polarization in the regime that is relevant here. C1 UNIV ILLINOIS,DEPT PHYS,URBANA,IL 61801. RP NEDOLUHA, GE (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 30 TC 37 Z9 37 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 1994 VL 423 IS 1 BP 394 EP 411 DI 10.1086/173816 PN 1 PG 18 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA MZ152 UT WOS:A1994MZ15200033 ER PT J AU BERGERON, P RUIZ, MT LEGGETT, SK SAUMON, D WESEMAEL, F AF BERGERON, P RUIZ, MT LEGGETT, SK SAUMON, D WESEMAEL, F TI THE PECULIAR COOL WHITE-DWARF LHS-1126 REVISITED SO ASTROPHYSICAL JOURNAL LA English DT Article DE STARS, ATMOSPHERES; STARS, INDIVIDUAL (LHS-1126); WHITE DWARFS ID INFRARED PHOTOMETRY; ATMOSPHERIC COMPOSITION; SPECTRA; CARBON AB We present a detailed analysis of new photometric and spectroscopic data, both in the optical and in the infrared, of the cool white dwarf LHS 1126. We show that the peculiar energy distribution of this object, and especially the large infrared flux deficiency, is the result of the collision-induced absorption by molecular hydrogen due to collisions with helium. The effective temperature and the helium abundance are determined from a fit to the energy distribution while the surface gravity is constrained by the trigonometric parallax measurement. We obtain T(eff) = 5400 +/- 200 K, log g = 7.85 +/- 0.17, and log N(He)/N(H) = 0.8 +/- 0.2. The nature of the spectroscopic features observed previously in the infrared and in the optical are rediscussed within the context of both these new observations and our model atmosphere fit. C1 UNIV ARIZONA,LUNAR & PLANETARY LAB,TUCSON,AZ 85721. UNIV CHILE,DEPT ASTRON,SANTIAGO,CHILE. USN OBSERV,FLAGSTAFF,AZ 86002. RP BERGERON, P (reprint author), UNIV MONTREAL,DEPT PHYS,CP 6128,SUCC A,MONTREAL H3C 3J7,QUEBEC,CANADA. RI Ruiz, Maria Teresa/I-5770-2016; OI Ruiz, Maria Teresa/0000-0002-6799-1537; Leggett, Sandy/0000-0002-3681-2989 NR 31 TC 43 Z9 43 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 1 PY 1994 VL 423 IS 1 BP 456 EP 460 DI 10.1086/173823 PN 1 PG 5 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA MZ152 UT WOS:A1994MZ15200040 ER PT J AU CHUBB, SR AF CHUBB, SR TI SUN-INDUCED VARIATIONS IN TIME IN THE GLOBAL POSITIONING SYSTEM SO ASTROPHYSICS AND SPACE SCIENCE LA English DT Article AB Sun-induced effects on the measurement and transfer of time information reported by orbiting satellites are reexamined. The problem of transforming the frequency of coherent radio signals to the Geocentric Inertial Coordinate frame (as required during the transfer of time information) involves an implicit, dependence on earth-sun-clock orientation that has been omitted, except in Very-Long-Baseline Interferometry (VLBI) studies. This known VLBI effect leads to an important second order Doppler effect. The effect explains systematic deviations between the time reported by satellites in the Global Positioning System (GPS) relative to Universal Time (UT) and can be used to improve existing bounds for the validity of the equivalence principle. RP CHUBB, SR (reprint author), USN,RES LAB,DIV REMOTE SENSING,WASHINGTON,DC 20375, USA. NR 9 TC 0 Z9 0 U1 0 U2 1 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 1994 VL 213 IS 1 BP 63 EP 74 DI 10.1007/BF00627778 PG 12 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA NT614 UT WOS:A1994NT61400002 ER PT J AU FORSTER, EM CAMMAROTA, JP WHINNERY, JE AF FORSTER, EM CAMMAROTA, JP WHINNERY, JE TI G-LOC RECOVERY WITH AND WITHOUT G-SUIT INFLATION SO AVIATION SPACE AND ENVIRONMENTAL MEDICINE LA English DT Note ID ACCELERATION; CONSCIOUSNESS AB During acceleration (+Gz) training in the human centrifuge, the anti-Ci suit (AGS) is usually deflated as acceleration decreases upon termination of the exposure, regardless of the reason for termination, including +Gz-induced loss of consciousness (G-LOC). This is when the trainee most needs the support pro provided by the AGS. A method to reduce the time of incapacitation resulting from G-LOC was evaluated. The standard CSU15-P suit worn by 30 aircrew while undergoing +Gz tolerance training wets inflated to 10 psi immediately upon G-LOC (GS group). Incapacitation times and flailing activity were recorded and compared with 51 aircrew whose AGS wets not abruptly inflated upon G-LOC (NGS group). Absolute incapacitation was significantly different between both groups (p = 0.024). The GS group exhibited flailing behavior for a longer period of time during relative incapacitation than the NGS group (p = 0.0003). Total incapacitation remained unaffected. A brief period of confusion occasionally accompanied by mimic or myoclonic convulsions was observed more often in the GS group. Inflation of the AGS upon G-LOC seems to reduce absolute incapacitation by approximately 2 s, thereby causing the trainee to be aware of his environment and G-LOC more quickly, even though his motor function has not yet been fully restored. RP FORSTER, EM (reprint author), USN,CTR AIR DEV,DIV AIRCRAFT,AERIAL COMBAT MANEUVERING ENHANCEMENT LAB,WARMINSTER,PA 18974, USA. NR 7 TC 0 Z9 0 U1 1 U2 1 PU AEROSPACE MEDICAL ASSOC PI ALEXANDRIA PA 320 S HENRY ST, ALEXANDRIA, VA 22314-3579 SN 0095-6562 J9 AVIAT SPACE ENVIR MD JI Aviat. Space Environ. Med. PD MAR PY 1994 VL 65 IS 3 BP 249 EP 253 PG 5 WC Public, Environmental & Occupational Health; Medicine, General & Internal; Sport Sciences SC Public, Environmental & Occupational Health; General & Internal Medicine; Sport Sciences GA MZ304 UT WOS:A1994MZ30400012 PM 8185556 ER PT J AU DEVOLL, JR SACKS, EJ AF DEVOLL, JR SACKS, EJ TI EVALUATION OF AN AVIATOR WITH CHRONIC DISEQUILIBRIUM, OSCILLOPSIA, AND CENTRAL SLEEP-APNEA SO AVIATION SPACE AND ENVIRONMENTAL MEDICINE LA English DT Article ID INTRACRANIAL EPIDERMOID TUMORS AB A case is presented of an aviator with chronic disequilibrium, oscillopsia, and central sleep apnea. History, physical examination, and special studies are presented establishing a diagnosis of epidermoid tumor at the foramen magnum. Differential diagnosis and relation of findings to the lesion are presented. The aeromedical significance of this case is to reinforce the importance of persistence and the team concept in establishing diagnoses when aviators present with confusing or unexplained symptoms. RP DEVOLL, JR (reprint author), USN,INST AEROSP & OPERAT MED,DEPT OTORHINOLARYNGOL,NAVAL AIR STN,220 HOVEY RD,PENSACOLA,FL 32508, USA. NR 18 TC 0 Z9 0 U1 0 U2 0 PU AEROSPACE MEDICAL ASSOC PI ALEXANDRIA PA 320 S HENRY ST, ALEXANDRIA, VA 22314-3579 SN 0095-6562 J9 AVIAT SPACE ENVIR MD JI Aviat. Space Environ. Med. PD MAR PY 1994 VL 65 IS 3 BP 263 EP 266 PG 4 WC Public, Environmental & Occupational Health; Medicine, General & Internal; Sport Sciences SC Public, Environmental & Occupational Health; General & Internal Medicine; Sport Sciences GA MZ304 UT WOS:A1994MZ30400015 PM 8185560 ER PT J AU NEWMAN, SB SMITH, DR AF NEWMAN, SB SMITH, DR TI REPORT ON THE 3RD INTERNATIONAL-CONFERENCE ON SCHOOL AND POPULAR METEOROLOGICAL AND OCEANOGRAPHIC EDUCATION SO BULLETIN OF THE AMERICAN METEOROLOGICAL SOCIETY LA English DT Article AB The Third International Conference on School and Popular Meteorological and Oceanographic Education was held 14-18 July 1993 in Toronto, Ontario. Canada. This conference was attended by approximately 150 educators, meteorologists, oceanographers, and government officials representing 12 countries. The themes of this conference were the role of meteorology and oceanography in the formal science education of students in grades K-12 and the enhancement of scientific literacy of the public in order to permit individuals to make better use of products and services provided by the national environmental services and the media. Sixty formal presentations plus two poster sessions and six workshops provided information on educational programs as well as a variety of classroom activities on meteorological and oceanographic topics. C1 USN ACAD,DEPT OCEANOG,ANNAPOLIS,MD 21402. RP NEWMAN, SB (reprint author), CENT CONNECTICUT STATE UNIV,DEPT PHYS EARTH SCI,NEW BRITAIN,CT 06050, USA. NR 2 TC 1 Z9 1 U1 0 U2 0 PU AMER METEOROLOGICAL SOC PI BOSTON PA 45 BEACON ST, BOSTON, MA 02108-3693 SN 0003-0007 J9 B AM METEOROL SOC JI Bull. Amer. Meteorol. Soc. PD MAR PY 1994 VL 75 IS 3 BP 435 EP 444 PG 10 WC Meteorology & Atmospheric Sciences SC Meteorology & Atmospheric Sciences GA NC607 UT WOS:A1994NC60700007 ER PT J AU LEAHY, JG JONESMEEHAN, JM COLWELL, RR AF LEAHY, JG JONESMEEHAN, JM COLWELL, RR TI TRANSFORMATION OF ACINETOBACTER-CALCOACETICUS RAG-1 BY ELECTROPORATION SO CANADIAN JOURNAL OF MICROBIOLOGY LA English DT Article DE ELECTROPORATION; ACINETOBACTER; TRANSFORMATION; PLASMID; TRANSPOSON ID CLONING VECTORS AB A method is described for transforming Acinetobacter calcoaceticus RAG-1 with a transposon-delivery plasmid, pLOFPttKm, and the broad-host-range cloning vector pKT230. Kanamycin-resistant transformants isolated following electroporation with pLOFPttKm were shown to have lost the plasmid, and contained the transposon mini-Tn10PttKm in at least five unique, single sites. Transformation with pKT230 was confirmed by plasmid screening and acquisition of the kanamycin-resistant, streptomycin-resistant phenotype. By optimizing conditions of electric field strength and pulse length for electroporation, we obtained a maximum efficiency of 4.36 x 10(2)/(mu g DNA.10(9) cells) for insertion of the mini-Tn10PttKm transposon, and 9.88 x 10(4)/(mu g DNA 10(9) cells) for transformation with plasmid pKT230. Our results indicate that electroporation is a suitable method for introducing transposon and cloning vectors into A. calcoaceticus RAG-1, and possibly other Acinetobacter spp. The availability of a transformation system should enhance the molecular genetic and physiological analysis of these bacteria, particularly the vast majority of strains that are not competent for transformation with DNA. C1 UNIV MARYLAND,DEPT MICROBIOL,COLLEGE PARK,MD 20742. USN,CTR SURFACE WARFARE,SILVER SPRING,MD 20903. NR 15 TC 8 Z9 8 U1 1 U2 5 PU NATL RESEARCH COUNCIL CANADA PI OTTAWA PA RESEARCH JOURNALS, MONTREAL RD, OTTAWA ON K1A 0R6, CANADA SN 0008-4166 J9 CAN J MICROBIOL JI Can. J. Microbiol. PD MAR PY 1994 VL 40 IS 3 BP 233 EP 236 PG 4 WC Biochemistry & Molecular Biology; Biotechnology & Applied Microbiology; Immunology; Microbiology SC Biochemistry & Molecular Biology; Biotechnology & Applied Microbiology; Immunology; Microbiology GA NK056 UT WOS:A1994NK05600011 ER PT J AU SCHOEN, PE NAGUMO, M SINGH, A AF SCHOEN, PE NAGUMO, M SINGH, A TI RAMAN-ACTIVE SKELETAL-OPTICAL VIBRATIONS OF HYDROCARBON CHAIN SEGMENTS IN A SERIES OF DIACETYLENIC LIPIDS SO CHEMISTRY AND PHYSICS OF LIPIDS LA English DT Note DE RAMAN SPECTROSCOPY; LIPIDS; DIACETYLENE; ORDER; TRANS CONFORMATION; MOLECULAR PROBES ID PHOSPHATIDYLCHOLINES; BEHAVIOR; ISOMERS AB Raman scattering experiments have been performed on phosphatidylcholine headgroup lipids whose hydrocarbon chains are divided into segments ranging from four to seventeen methylenes in length by the presence of diacetylene units. The chain segments of the dihydrate lipid were in the all-trans configuration at room temperature. Raman bands due to skeletal-optical vibrations of segments proximal and distal to the lipid headgroup were observed, whose frequencies changed with segment length. For 'free' segments between the diacetylene and the methyl terminus the zero order Raman shifts ranged from 1116 cm-1 for a 6 methylene segment length to 1130 cm-1 for a 17 methylene segment, and for 'bound' segments between the headgroup and the diacetylene the shifts varied between 1069 cm-1 for a 5 methylene segment and 1109 cm-1 for a 9 methylene segment. In all cases the longer methylene segments had higher frequencies than the shorter segments. For higher order vibrations of both bound and free segments, lower frequencies were measured. RP SCHOEN, PE (reprint author), USN,RES LAB,CTR BIOMOLEC SCI & ENGN,CODE 6900,WASHINGTON,DC 20375, USA. NR 14 TC 4 Z9 4 U1 0 U2 0 PU ELSEVIER SCI IRELAND LTD PI CLARE PA CUSTOMER RELATIONS MANAGER, BAY 15, SHANNON INDUSTRIAL ESTATE CO, CLARE, IRELAND SN 0009-3084 J9 CHEM PHYS LIPIDS JI Chem. Phys. Lipids PD MAR 1 PY 1994 VL 69 IS 3 BP 251 EP 257 DI 10.1016/0009-3084(94)90006-X PG 7 WC Biochemistry & Molecular Biology; Biophysics SC Biochemistry & Molecular Biology; Biophysics GA NC246 UT WOS:A1994NC24600006 ER PT J AU KELLER, TM AF KELLER, TM TI SYNTHESIS AND POLYMERIZATION OF MULTIPLE AROMATIC ETHER PHTHALONITRILES SO CHEMISTRY OF MATERIALS LA English DT Article ID RESIN; POLYMERS AB Multiple aromatic ether-linked phthalonitrile polymers have been synthesized and characterized. The oligomeric monomers are prepared from reaction of an excess amount of a bisphenol such as 4,4'-(hexafluoroisopropylidene)bisphenol or 4,4'-dihydroxybiphenyl with 4,4'-difluorobenzophenone in the presence of either weak or strong bases in N-methylpyrrolidinone (NMP) as solvent, followed by end-capping with 4-nitrophthalonitrile. The oligomeric phthalonitrile monomers were cured in the presence of a minute quantity of 1,3-bis(3-aminophenoxy)benzene or p-toluenesulfonic acid. The thermal and oxidative properties of two such polymeric systems were compared under identical curing conditions. RP KELLER, TM (reprint author), USN,RES LAB,MAT CHEM BRANCH,CODE 6127,WASHINGTON,DC 20375, USA. NR 23 TC 75 Z9 82 U1 1 U2 7 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0897-4756 J9 CHEM MATER JI Chem. Mat. PD MAR PY 1994 VL 6 IS 3 BP 302 EP 305 DI 10.1021/cm00039a009 PG 4 WC Chemistry, Physical; Materials Science, Multidisciplinary SC Chemistry; Materials Science GA NC637 UT WOS:A1994NC63700009 ER PT J AU CARL, M ISAACS, SN KAUR, M KE, JK TAM, AW YARBOUGH, PO REYES, GR AF CARL, M ISAACS, SN KAUR, M KE, JK TAM, AW YARBOUGH, PO REYES, GR TI EXPRESSION OF HEPATITIS-E VIRUS PUTATIVE STRUCTURAL PROTEINS IN RECOMBINANT VACCINIA VIRUSES SO CLINICAL AND DIAGNOSTIC LABORATORY IMMUNOLOGY LA English DT Note ID NON-B HEPATITIS; DEPENDENT RNA-POLYMERASE; TRANSMITTED NON-A; EPIDEMIC NON-A; IDENTIFICATION; EPITOPES; STRAIN; ASSAY; INDIA; HEV AB Hepatitis E virus (HEV) is a polyadenylated, positive-stranded RNA virus which is a major cause of enterically transmitted non-A, non-B hepatitis in many developing countries. The viral genome contains three different open reading frames (ORFs): ORF1, which is believed to encode nonstructural proteins, and ORF2 and ORF3, which are believed to encode structural proteins. The full-length putative structural proteins encoded by ORF2 and ORF3 of HEV have been cloned and expressed in recombinant vaccinia virus. Proteins encoded by ORF2 and ORF3 when expressed in vaccinia virus are recognized by pooled sera obtained from individuals with acute hepatitis E. Vaccinia expressed viral gene products of HEV will have utility in characterizing the cell-mediated immune response to HEV. C1 USN,MED RES INST,ACCELERATED PROD DEV PROGRAM,BETHESDA,MD. NIAID,BETHESDA,MD 20892. GENELABS INC,DEPT MOLEC VIROL,REDWOOD CITY,CA 94063. NR 33 TC 10 Z9 10 U1 0 U2 3 PU AMER SOC MICROBIOLOGY PI WASHINGTON PA 1325 MASSACHUSETTS AVENUE, NW, WASHINGTON, DC 20005-4171 SN 1071-412X J9 CLIN DIAGN LAB IMMUN JI Clin. Diagn. Lab. Immunol. PD MAR PY 1994 VL 1 IS 2 BP 253 EP 256 PG 4 WC Immunology; Infectious Diseases; Microbiology SC Immunology; Infectious Diseases; Microbiology GA PT562 UT WOS:A1994PT56200027 PM 7496958 ER PT J AU MACK, GR MCPHERSON, SA LUTZ, RB AF MACK, GR MCPHERSON, SA LUTZ, RB TI ACUTE MEDIAN NEUROPATHY AFTER WRIST TRAUMA - THE ROLE OF EMERGENT CARPAL-TUNNEL RELEASE SO CLINICAL ORTHOPAEDICS AND RELATED RESEARCH LA English DT Article ID COLLES FRACTURE; DISTAL RADIUS; PRESSURE; DECOMPRESSION AB Ten cases of acute carpal tunnel syndrome (ACTS) and six cases of nerve contusion were identified in patients with acute median neuropathy associated with blunt wrist trauma. The patients with ACTS initially had normal sensation and subsequently developed objective sensory loss (2-point discrimination greater than 15 mm) in the median nerve distribution associated with severe wrist pain. Patients with nerve contusion injuries had immediate sensory loss and symptoms were nonprogressive. Wick catheter measurements of the carpal canal pressure were used in seven patients to help distinguish ACTS (pressure greater than 40 mm Hg) from nerve contusion. The interstitial carpel tunnel pressure was elevated an average of 52 mm Hg in four of five patients with ACTS but was normal in two patients with nerve contusion. Four of five patients who underwent carpal tunnel release within 40 hours of the onset of numbness had normal 2-point discrimination within 96 hours. The results of this study and review of the literature reflect the urgency of carpal tunnel release in ACTS. Neuropathy, secondary to nerve contusion without coexisting ACTS, may be treated initially by observation. Acute carpel tunnel syndrome must be distinguished from nerve contusion as a cause of acute posttraumatic median neuropathy. C1 USN,MED CTR,DEPT ORTHOPAED SURG,SAN DIEGO,CA. RP MACK, GR (reprint author), USN,MED CTR,DEPT CLIN INVEST,SAN DIEGO,CA 92134, USA. NR 42 TC 26 Z9 29 U1 0 U2 1 PU LIPPINCOTT-RAVEN PUBL PI PHILADELPHIA PA 227 EAST WASHINGTON SQ, PHILADELPHIA, PA 19106 SN 0009-921X J9 CLIN ORTHOP RELAT R JI Clin. Orthop. Rel. Res. PD MAR PY 1994 IS 300 BP 141 EP 146 PG 6 WC Orthopedics; Surgery SC Orthopedics; Surgery GA MZ827 UT WOS:A1994MZ82700018 PM 8131326 ER PT J AU CANRIGHT, D AF CANRIGHT, D TI ESTIMATING THE SPATIAL EXTENT OF ATTRACTORS OF ITERATED FUNCTION SYSTEMS SO COMPUTERS & GRAPHICS-UK LA English DT Article ID FRACTALS AB From any given Iterated Function System, a small set of balls that cover the fractal attractor can be simply determined. This gives a priori bounds on the region of space in which the attractor may be constructed. RP CANRIGHT, D (reprint author), USN, POSTGRAD SCH, DEPT MATH, CODE MA CA, MONTEREY, CA 93943 USA. NR 8 TC 5 Z9 5 U1 0 U2 0 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLAND SN 0097-8493 EI 1873-7684 J9 COMPUT GRAPH-UK JI Comput. Graph.-UK PD MAR-APR PY 1994 VL 18 IS 2 BP 231 EP 238 DI 10.1016/0097-8493(94)90098-1 PG 8 WC Computer Science, Software Engineering SC Computer Science GA NK058 UT WOS:A1994NK05800011 ER PT J AU FLIPPEN, LD AF FLIPPEN, LD TI CONSTITUTIVE-OPERATOR SMOOTHING BY CONDENSATION SO COMPUTERS & MATHEMATICS WITH APPLICATIONS LA English DT Article DE CONDENSATION; CONSTITUTIVE; HOMOGENIZATION; SMOOTHING; DEGREE-OF-FREEDOM; SEMIDISCRETE AB An existing condensation model reduction theory is modified so as to perform degree-of-freedom elimination on the constitutive operators of semi-discrete system models while retaining system-response-prediction fidelity in those degrees-of-freedom that remain. For the important special case for which this process corresponds to homogenizing/smoothing of the constitutive behavior of deterministic, heterogeneous media, such as composites, the spatially-discrete version of the macroscale constitutive operator is fully and directly calculated from the given, spatially discrete microscale-constitutive and material-independent operators, the composition of which forms the spatially discrete system operator. (In this paper, ''micro'' is taken to mean the scale of the heterogeneity, such as the inclusion-matrix scale of a composite component, and ''macro'' is taken to mean a scale which is globally small but large compared to the heterogeneity, such as the local-structural-response scale of a composite component. Some refer to this definition of microscale as the mesoscale.) The form of structural-scale composite constitutive operators, as well as their content, are hence amenable to systematic deduction in this semi-discrete setting. (Linear-elastic and viscoelastic forms are examples of stress-strain constitutive operator forms for solids.) This contrasts with current ''guess the form and fit its parameters'' techniques. In fact, it is shown that the semi-discrete kernel of a wide class of nonlocal macroscale constitutive operators can be computed directly. The condensation method of this paper is applicable to nonlinear constitutive relations as well as linear ones, at least to an extent comparable to the condensation model reduction theory from which it originated. As both a demonstration and a validation check, the method is applied to the computation of the macroscale stress-displacement operator for both a periodic and a nonperiodic linear elastic laminate. RP FLIPPEN, LD (reprint author), USN,RES LAB,CODE 6380,4555 OVERLOOK AVE SW,WASHINGTON,DC 20375, USA. NR 9 TC 2 Z9 2 U1 1 U2 2 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0898-1221 J9 COMPUT MATH APPL JI Comput. Math. Appl. PD MAR PY 1994 VL 27 IS 6 BP 5 EP 18 DI 10.1016/0898-1221(94)90106-6 PG 14 WC Mathematics, Applied SC Mathematics GA NA083 UT WOS:A1994NA08300002 ER PT J AU RABINOVICI, R RUDOLPH, AS VERNICK, J FEUERSTEIN, G AF RABINOVICI, R RUDOLPH, AS VERNICK, J FEUERSTEIN, G TI LYOPHILIZED LIPOSOME-ENCAPSULATED HEMOGLOBIN - EVALUATION OF HEMODYNAMIC, BIOCHEMICAL, AND HEMATOLOGIC RESPONSES SO CRITICAL CARE MEDICINE LA English DT Article DE BLOOD SUBSTITUTE; LIPOSOMES; HEMOGLOBIN; OXYGEN; HEMODYNAMICS; HEMATOLOGY; BIOCHEMISTRY; CYTOKINES; PROSTAGLANDINS; CRITICAL ILLNESS ID BIOLOGICAL RESPONSES; BLOOD SUBSTITUTE; RAT; CELLS AB Objective: To characterize the hemodynamic, biochemical, and hematologic responses to the administration of the oxygen-carrying fluid lyophilized Liposome-encapsulated hemoglobin in the conscious, normovolemic rat. Design: Prospective, randomized trial. Setting: Animal laboratory, Jefferson Medical College. Subjects: Eighty-four male Sprague-Dawley rats. Interventions: Catheters were introduced into the right atrium (through the jugular vein) and both femoral arteries of test animals, and a thermistor was placed in the ascending aorta through the left common carotid artery for infusion of lyophilized liposome-encapsulated hemoglobin, blood collection, and blood pressure (BP) and cardiac output determinations. Measurements and Main Results: Lyophilized liposome-encapsulated hemoglobin (n = 8) infusion (1 mL/min iv) at 1 or 6 mL/kg (10% of estimated blood volume) had no detectable effect on BP, cardiac output, total peripheral resistance, and heart rate during the 5-hr observation period, The infusion also had no effect on hematocrit, leukocyte count, and serum tumor necrosis factor-alpha concentrations. Survival at 7 days was 100% (n = 20). Lyophilized liposome-encapsulated hemoglobin caused transient (2-hr) thrombocytopenia (-24+/-9% vs. a Ringer's lactate control group, p < .01), and marginally increased serum thromboxane B-2 concentrations (14.6+/-6 pg/100 mu L, p < .01). Conclusions: These data suggest that lyophilized liposome-encapsulated hemoglobin can be safely administered to conscious rats, supporting the development of this substance as a potential blood substitute. C1 SMITHKLINE BEECHAM PHARMACEUT, DEPT PHARMACOL, KING OF PRUSSIA, PA 19406 USA. USN, RES LAB, CTR BIOMOLEC SCI & ENGN, WASHINGTON, DC 20375 USA. RP RABINOVICI, R (reprint author), JEFFERSON MED COLL, DEPT SURG, 1025 WALNUT ST, PHILADELPHIA, PA 19107 USA. NR 24 TC 42 Z9 42 U1 0 U2 1 PU WILLIAMS & WILKINS PI BALTIMORE PA 351 WEST CAMDEN ST, BALTIMORE, MD 21201-2436 SN 0090-3493 J9 CRIT CARE MED JI Crit. Care Med. PD MAR PY 1994 VL 22 IS 3 BP 480 EP 485 DI 10.1097/00003246-199403000-00019 PG 6 WC Critical Care Medicine SC General & Internal Medicine GA NA320 UT WOS:A1994NA32000019 PM 8124999 ER PT J AU HANSEN, KA WOOD, R AF HANSEN, KA WOOD, R TI AN UNUSUAL COMPLICATION OF LAPAROSCOPIC CHOLECYSTECTOMY SO ENDOSCOPY LA English DT Note ID GALLSTONES; GALLBLADDER; DISSOLUTION AB Laparoscopic cholecystectomy is gaining increasing acceptance as a mode of minimally invasive surgery. We describe a peculiar gynecologic complication following uncomplicated laparoscopic cholecystectomy. Our patient presented with a four-month history of subacute pelvic pain, primarily located in the right lower quadrant, two years after laparoscopic cholecystectomy. Diagnostic laparoscopy revealed a hemaclip embedded in the right ovarian capsule of an otherwise normal pelvis. The hemaclip had probably dislodged from its original site of placement in the upper abdomen, and migrated to the dependent portions of the pelvis, where it implanted in a follicular stigma and became affixed to the ovarian capsule. The hemaclip was removed without complications, and the patient's symptoms improved. C1 USN HOSP,DEPT OBSTET & GYNECOL,PORTSMOUTH,VA. RP HANSEN, KA (reprint author), MED COLL GEORGIA,DEPT OBSTET & GYNECOL,AUGUSTA,GA 30912, USA. NR 10 TC 7 Z9 8 U1 0 U2 0 PU GEORG THIEME VERLAG PI STUTTGART PA P O BOX 30 11 20, D-70451 STUTTGART, GERMANY SN 0013-726X J9 ENDOSCOPY JI Endoscopy PD MAR PY 1994 VL 26 IS 3 BP 322 EP 323 DI 10.1055/s-2007-1008977 PG 2 WC Gastroenterology & Hepatology; Surgery SC Gastroenterology & Hepatology; Surgery GA NL556 UT WOS:A1994NL55600012 PM 8076554 ER PT J AU HYDE, D TAYLOR, WF WEINBERG, RP MARCINIK, EJ AF HYDE, D TAYLOR, WF WEINBERG, RP MARCINIK, EJ TI THERMAL BALANCE DURING COLD-WATER ACCLIMATION SO FASEB JOURNAL LA English DT Meeting Abstract C1 USN,MED RES INST,BETHESDA,MD 20889. NR 0 TC 0 Z9 0 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 PY 1994 VL 8 IS 4 BP A67 EP A67 PG 1 WC Biochemistry & Molecular Biology; Biology; Cell Biology SC Biochemistry & Molecular Biology; Life Sciences & Biomedicine - Other Topics; Cell Biology GA ND196 UT WOS:A1994ND19600390 ER PT J AU KOWALSKI, KR HARFORD, RR THOMAS, JR AF KOWALSKI, KR HARFORD, RR THOMAS, JR TI SUBCUTANEOUS FAT CHANGES IN MILITARY PERSONNEL WORKING OUTDOORS IN A COLD CLIMATE 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 PY 1994 VL 8 IS 4 BP A67 EP A67 PG 1 WC Biochemistry & Molecular Biology; Biology; Cell Biology SC Biochemistry & Molecular Biology; Life Sciences & Biomedicine - Other Topics; Cell Biology GA ND196 UT WOS:A1994ND19600389 ER PT J AU LENNON, PF MURRAY, PA AF LENNON, PF MURRAY, PA TI ATTENUATED HYPOXIC PULMONARY VASOCONSTRICTION DURING ISOFLURANE ANESTHESIA IS ABOLISHED BY CYCLOOXYGENASE INHIBITION SO FASEB JOURNAL LA English DT Meeting Abstract C1 JOHNS HOPKINS MED INST,BALTIMORE,MD 21205. USN,NATL MED CTR,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 PY 1994 VL 8 IS 4 BP A26 EP A26 PG 1 WC Biochemistry & Molecular Biology; Biology; Cell Biology SC Biochemistry & Molecular Biology; Life Sciences & Biomedicine - Other Topics; Cell Biology GA ND196 UT WOS:A1994ND19600152 ER PT J AU MEYER, LG SAXTON, JL GARCIA, JM LOTZ, WG AF MEYER, LG SAXTON, JL GARCIA, JM LOTZ, WG TI MINIMAL EFFECTS OF A VASOPRESSIN ANTAGONIST ON THE PHYSIOLOGICAL-RESPONSE OF THE RHESUS-MONKEY TO COLD-AIR 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 PY 1994 VL 8 IS 4 BP A287 EP A287 PG 1 WC Biochemistry & Molecular Biology; Biology; Cell Biology SC Biochemistry & Molecular Biology; Life Sciences & Biomedicine - Other Topics; Cell Biology GA ND196 UT WOS:A1994ND19601652 ER PT J AU PERRIN, PJ SCOTT, D QUIGLY, L FEDER, O DAVIS, T GRAY, G JUNE, CH RACKE, M AF PERRIN, PJ SCOTT, D QUIGLY, L FEDER, O DAVIS, T GRAY, G JUNE, CH RACKE, M TI ROLE OF B7-1/B7-2-CD28/CTLA-4 INTERACTION IN EXPERIMENTAL ALLERGIC ENCEPHALOMYELITIS SO FASEB JOURNAL LA English DT Meeting Abstract C1 USN,MED RES INST,IMMUNE CELL BIOL PROGRAM,BETHESDA,MD 20814. US FDA,BETHESDA,MD 20014. NINCDS,BETHESDA,MD 20892. REPLIGEN CORP,CAMBRIDGE,MA. 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 PY 1994 VL 8 IS 4 BP A198 EP A198 PG 1 WC Biochemistry & Molecular Biology; Biology; Cell Biology SC Biochemistry & Molecular Biology; Life Sciences & Biomedicine - Other Topics; Cell Biology GA ND196 UT WOS:A1994ND19601141 ER PT J AU RICHARDS, A DASCH, G AF RICHARDS, A DASCH, G TI INDUCTION OF TNF RELEASE FROM HUMAN MONOCYTIC CELLS BY PATHOGENIC RICKETTSIAE, A REQUIREMENT FOR INTACT RICKETTSIA, BUT NOT HOST-CELL MICROFILAMENT OR MICROTUBULE FUNCTION SO FASEB JOURNAL LA English DT Meeting Abstract C1 USN,DEPT IMMUNOL,MED RES UNIT 2,APO,AP 96520. USN,MED RES INST,DEPT MICROBIOL & IMMUNOL,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 PY 1994 VL 8 IS 4 BP A216 EP A216 PG 1 WC Biochemistry & Molecular Biology; Biology; Cell Biology SC Biochemistry & Molecular Biology; Life Sciences & Biomedicine - Other Topics; Cell Biology GA ND196 UT WOS:A1994ND19601244 ER PT J AU SHAW, E FEITH, S COYNE, JT BALES, B POZOS, R HACKNEY, AC AF SHAW, E FEITH, S COYNE, JT BALES, B POZOS, R HACKNEY, AC TI EFFECTS OF RAPID ASCENT MOUNTAINEERING IN THE SUB-ARCTIC ON THE BODY-COMPOSITION OF UNITED-STATES-MARINES SO FASEB JOURNAL LA English DT Meeting Abstract C1 USN,HLTH RES CTR,SAN DIEGO,CA 92152. RI HACKNEY, ANTHONY/D-9521-2013 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 PY 1994 VL 8 IS 4 BP A298 EP A298 PG 1 WC Biochemistry & Molecular Biology; Biology; Cell Biology SC Biochemistry & Molecular Biology; Life Sciences & Biomedicine - Other Topics; Cell Biology GA ND196 UT WOS:A1994ND19601720 ER PT J AU TAYLOR, WF HYDE, D WEINBERG, RP MARCINIK, EJ AF TAYLOR, WF HYDE, D WEINBERG, RP MARCINIK, EJ TI SKIN BLOOD-FLOW DURING COLD-WATER ACCLIMATION SO FASEB JOURNAL LA English DT Meeting Abstract C1 USN,MED RES INST,HYBERBAR ENVIRONM ADAPTAT PROGRAM,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 PY 1994 VL 8 IS 4 BP A67 EP A67 PG 1 WC Biochemistry & Molecular Biology; Biology; Cell Biology SC Biochemistry & Molecular Biology; Life Sciences & Biomedicine - Other Topics; Cell Biology GA ND196 UT WOS:A1994ND19600387 ER PT J AU VOGT, PR CRANE, K SUNDVOR, E MAX, MD PFIRMAN, SL AF VOGT, PR CRANE, K SUNDVOR, E MAX, MD PFIRMAN, SL TI METHANE-GENERATED(QUESTIONABLE) POCKMARKS ON YOUNG, THICKLY SEDIMENTED OCEANIC-CRUST IN THE ARCTIC - VESTNESA-RIDGE, FRAM STRAIT SO GEOLOGY LA English DT Article AB Acoustic backscatter imagery in the Fram strait (between Greenland and Spitzbergen) reveals a 1-3-km-wide, 50-km-long belt of approximately 50 pointlike backscatter objects decorating the approximately 1300-m-deep crest of Vestnesa Ridge, a 1->2 km thick sediment drift possibly underlain by a transform-parallel oceanic basement ridge (crustal ages approximately 3-14 Ma). A 3.5 kHz seismic-reflection profile indicates that at least some objects are pockmarks approximately 100-200 m in diameter and 10-20 m deep. The pockmarks (possibly also mud diapirs) may have been formed by evolution of methane generated by the decomposition of marine organic matter in the Vestnesa ridge sediment drift. The ridge may be underlain by an anticlinal carapace of methane-hydrate calculated to be 200-300 m thick, comparable to the hydrate thickness measured just to the south. The rising methane would collect in the ridge-crest trap, intermittently escaping to the sea floor. This hypothesis is supported by multichannel evidence for bright spots and bottom-simulating reflectors in the area. The pockmark belt may also be located above a transcurrent fault. Sediment slumps on the flanks of Vestnesa ridge and northeast of Molloy ridge may have been triggered by plate-boundary earthquakes and facilitated by methane hydrates. C1 UNIV BERGEN,SEISMOL OBSERV,N-5007 BERGEN,NORWAY. SUPREME ALLIED COMMAND ATLANTIC UNDERSEA RES CTR,ARMY POST OFF,NEW YORK,NY 09019. COLUMBIA UNIV,LAMONT DOHERTY GEOL OBSERV,PALISADES,NY 10964. RP VOGT, PR (reprint author), USN,RES LAB,DIV MARINE GEOSCI,WASHINGTON,DC 20375, USA. NR 11 TC 48 Z9 49 U1 0 U2 2 PU GEOLOGICAL SOC AMERICA PI BOULDER PA PO BOX 9140 3300 PENROSE PLACE, BOULDER, CO 80301 SN 0091-7613 J9 GEOLOGY JI Geology PD MAR PY 1994 VL 22 IS 3 BP 255 EP 258 DI 10.1130/0091-7613(1994)022<0255:MGPOYT>2.3.CO;2 PG 4 WC Geology SC Geology GA MZ722 UT WOS:A1994MZ72200016 ER PT J AU QUARTARARO, AT AF QUARTARARO, AT TI MOLIERE AT THE SCHOOL OF THE REPUBLIC - FROM UNIVERSITY CRITICISM TO HANDBOOKS 1870-1914 - FRENCH - ALBENESE,R SO HISTORY OF EDUCATION QUARTERLY LA English DT Book Review RP QUARTARARO, AT (reprint author), USN ACAD,ANNAPOLIS,MD 21402, USA. NR 1 TC 0 Z9 0 U1 0 U2 0 PU HISTORY EDUC QUARTERLY PI BLOOMINGTON PA SCHOOL OF EDUCATION INDIANA UNIVERSITY, BLOOMINGTON, IN 47405 SN 0018-2680 J9 HIST EDUC QUART JI Hist. Educ. Q. PD SPR PY 1994 VL 34 IS 1 BP 108 EP 110 DI 10.2307/369245 PG 3 WC Education & Educational Research; History Of Social Sciences SC Education & Educational Research; Social Sciences - Other Topics GA NG081 UT WOS:A1994NG08100022 ER PT J AU LANG, RJ MEHUYS, D WELCH, DF GOLDBERG, L AF LANG, RJ MEHUYS, D WELCH, DF GOLDBERG, L TI SPONTANEOUS FILAMENTATION IN BROAD-AREA DIODE-LASER AMPLIFIERS SO IEEE JOURNAL OF QUANTUM ELECTRONICS LA English DT Article ID SEMICONDUCTOR AMPLIFIER; DIFFRACTION; POWER; BEAMS AB The stability of a plane wave propagating in single- and double-pass broad-area diode laser amplifiers is analyzed. It is found that laterally periodic perturbations exhibit a longitudinal variation that is a mixture of exponential growth and periodic oscillation. The latter oscillation has a spatial period related to the Talbot distance. Due to the interaction between these two effects, double-pass amplifiers become unstable against lateral perturbations, and the field spontaneously collapses into a periodic array of filaments. Experimental results are presented that show good agreement with the theoretical analysis. C1 USN,RES LAB,CODE 6570,WASHINGTON,DC 20375. RP LANG, RJ (reprint author), SPECTRA DIODE LABS,SAN JOSE,CA 95134, USA. NR 14 TC 47 Z9 47 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 1994 VL 30 IS 3 BP 685 EP 694 DI 10.1109/3.286155 PG 10 WC Engineering, Electrical & Electronic; Optics; Physics, Applied SC Engineering; Optics; Physics GA NR239 UT WOS:A1994NR23900007 ER PT J AU KAMIKAWA, N CHANG, CT AF KAMIKAWA, N CHANG, CT TI A QUASI-SINGLE MODE OPTICAL-FIBER FOR LONG-HAUL TRANSMISSION IN SEVERE BENDING ENVIRONMENTS SO IEEE PHOTONICS TECHNOLOGY LETTERS LA English DT Article AB We investigated the feasibility of a quasi-single mode optical fiber for low bending losses in long-haul transmission at 1550 rum. The advantage of a quasi-single mode fiber is that for comparable bending losses the relative index difference, DELTA, can be smaller than the DELTA in a single-mode fiber. We demonstrated that a quasi-single mode fiber with DELTA = 0.72% and single-mode cutoff wavelength, lambda(c), equal to 1630 nm exhibits bending losses as low as the losses in a single-mode fiber with DELTA = 0.93% and lambda(c) = 1259 nm. Modal noise and modal dispersion effects in the quasi-single mode fiber also were tested and found to be minimal. This letter describes the matched-clad, quasi-single mode fiber and presents the test results. C1 SAN DIEGO STATE UNIV,DEPT ELECT & COMP ENGN,SAN DIEGO,CA 92182. RP KAMIKAWA, N (reprint author), USN,COMMAND CONTROL & OCEAN SURVEILLANCE CTR,DIV RES DEV TEST & EVALUAT,BOX 250,HONOLULU,HI 96860, USA. NR 9 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 1041-1135 J9 IEEE PHOTONIC TECH L JI IEEE Photonics Technol. Lett. PD MAR PY 1994 VL 6 IS 3 BP 428 EP 430 DI 10.1109/68.275508 PG 3 WC Engineering, Electrical & Electronic; Optics; Physics, Applied SC Engineering; Optics; Physics GA NG128 UT WOS:A1994NG12800034 ER PT J AU GORDON, WB AF GORDON, WB TI HIGH-FREQUENCY APPROXIMATIONS TO THE PHYSICAL OPTICS SCATTERING INTEGRAL SO IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION LA English DT Note AB We discuss two high frequency (HF) approximations to the Physical Optics (PO) scattering integral for the far field radar backscatter from a general curved edged reflecting surface viewed at arbitrary aspect. The PO scattering integral is first approximated as the sum of a specular effect and an edge effect, where the latter is represented explicitly as a certain line integral evaluated over the boundary edge of the reflector. A closed form result is then obtained by applying the method of Stationary Phase to the line integral. With the exception of singularities that can occur at caustics, or when specular point falls on the boundary edge, these HF approximations are found to work reasonably well for smooth surfaces whose Gaussian curvatures have constant sign (positive or negative, but never zero). RP GORDON, WB (reprint author), USN,RES LAB,DIV RADAR,CODE 5311,WASHINGTON,DC 20375, USA. NR 11 TC 24 Z9 29 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 0018-926X J9 IEEE T ANTENN PROPAG JI IEEE Trans. Antennas Propag. PD MAR PY 1994 VL 42 IS 3 BP 427 EP 432 DI 10.1109/8.280733 PG 6 WC Engineering, Electrical & Electronic; Telecommunications SC Engineering; Telecommunications GA NJ921 UT WOS:A1994NJ92100019 ER PT J AU BEY, PP YONCE, DJ FARE, TL AF BEY, PP YONCE, DJ FARE, TL TI STABILITY ANALYSIS OF AN AUTONULLING AC BRIDGE FOR USE WITH SILICON-BASED SENSORS SO IEEE TRANSACTIONS ON CIRCUITS AND SYSTEMS I-FUNDAMENTAL THEORY AND APPLICATIONS LA English DT Article AB A novel circuit incorporating integral feedback to automatically null an ac bridge is analyzed and discussed. Stability of the feedback scheme is examined by linearizing the system near the critical point (null) of the bridge using a standard perturbation method. Solutions of the nonlinear coupled differential equations that describe the operation of the autonulling ac bridge were obtained by numerical integration. A prototype was constructed using integrated circuits and discrete components to measure the transient response; test results of the circuit from transient impedance changes are compared to the time-dependent numerical solutions. C1 OHMICRON CORP,NEWTOWN,PA 18940. CORNELL UNIV,DEPT ELECT ENGN,ITHACA,NY 14853. RP BEY, PP (reprint author), USN,RES LAB,CTR BIOMOLEC SCI & ENGN,CODE 6900,WASHINGTON,DC 20375, 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 1057-7122 J9 IEEE T CIRCUITS-I JI IEEE Trans. Circuits Syst. I-Fundam. Theor. Appl. PD MAR PY 1994 VL 41 IS 3 BP 210 EP 239 DI 10.1109/81.273920 PG 30 WC Engineering, Electrical & Electronic SC Engineering GA NG605 UT WOS:A1994NG60500002 ER PT J AU PECKINPAUGH, SH HOLYER, RJ AF PECKINPAUGH, SH HOLYER, RJ TI CIRCLE DETECTION FOR EXTRACTING EDDY SIZE AND POSITION FROM SATELLITE IMAGERY OF THE OCEAN SO IEEE TRANSACTIONS ON GEOSCIENCE AND REMOTE SENSING LA English DT Article ID CIRCULAR ARC CENTER; RADIUS AB This paper evaluates the ability of several circle detectors to define the size and position of warm and cold eddies in oceanographic satellite imagery. The Advanced Very High Resolution Radiometer channel 4 (10.3-11.3 mum) or sea surface temperature test images are reduced to binary edge images. Six different circle detectors are then applied to the edge images. The automated results are compared to eddies defined by a trained analyst. RP PECKINPAUGH, SH (reprint author), USN,RES LAB,BAY ST LOUIS,MS 39529, USA. NR 18 TC 17 Z9 20 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 0196-2892 J9 IEEE T GEOSCI REMOTE JI IEEE Trans. Geosci. Remote Sensing PD MAR PY 1994 VL 32 IS 2 BP 267 EP 273 DI 10.1109/36.295041 PG 7 WC Geochemistry & Geophysics; Engineering, Electrical & Electronic; Remote Sensing; Imaging Science & Photographic Technology SC Geochemistry & Geophysics; Engineering; Remote Sensing; Imaging Science & Photographic Technology GA NU663 UT WOS:A1994NU66300005 ER PT J AU ABRAHAMS, J AF ABRAHAMS, J TI PARALLELIZED HUFFMAN AND HU-TUCKER SEARCHING SO IEEE TRANSACTIONS ON INFORMATION THEORY LA English DT Letter DE HUFFMAN ALGORITHM; HU-TUCKER ALGORITHM; PARALLEL; FOREST AB Forests constructed by the binary Huffman and Hu-Tucker algorithms solve parallelized search problems. Bounds on the resulting minimum average search lengths for items occurring with given probabilities are established. RP ABRAHAMS, J (reprint author), USN,OFF NAVAL RES,DIV MATH SCI,ARLINGTON,VA 22217, USA. NR 5 TC 4 Z9 4 U1 0 U2 0 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0018-9448 J9 IEEE T INFORM THEORY JI IEEE Trans. Inf. Theory PD MAR PY 1994 VL 40 IS 2 BP 508 EP 510 DI 10.1109/18.312175 PG 3 WC Computer Science, Information Systems; Engineering, Electrical & Electronic SC Computer Science; Engineering GA NX931 UT WOS:A1994NX93100021 ER PT J AU FRANKEL, MY VOELKER, RH HILFIKER, JN AF FRANKEL, MY VOELKER, RH HILFIKER, JN TI COPLANAR TRANSMISSION-LINES ON THIN SUBSTRATES FOR HIGH-SPEED LOW-LOSS PROPAGATION SO IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES LA English DT Article ID DISPERSION CHARACTERISTICS AB We investigate the attenuation and phase velocity characteristics of coplanar strip (CPS) transmission lines designed for high-speed, low-loss propagation at sub-THz frequencies. Photoconductor switches driven by femtosecond optical pulses were used to generate propagating picosecond electrical transients. External electrooptic sampling was used to measure the time-domain impulse-response characteristics with subpicosecond time resolution. The finite-difference transmission-line-matrix (FD-TLM) numerical method was used to model picosecond pulse propagation on identical transmission lines. The experiment and the numeric simulations have clarified nonquasistatic high-frequency effects and were shown to agree over a 500-GHz frequency range. Additionally, analytic quasi-static velocity and characteristic impedance formulas have been verified and their frequency range of validity established for the investigated CPS geometries. Radiation into the substrate is the dominant loss mechanism at frequencies above approximately 100 GHz for the CPS lines on thick substrates. CPS transmission line fabrication on thin substrates has been proposed as a method for reducing high-frequency loss and increasing the microwave propagation velocity. CPS transmission lines fabricated on 8-mum-thick Si membranes have been studied and demonstrated to possess the desired high-speed, low-loss properties. C1 UNIV NEBRASKA,DEPT ELECT ENGN,LINCOLN,NE 68588. UNIV NEBRASKA,CTR ELECTROOPT,LINCOLN,NE 68588. RP FRANKEL, MY (reprint author), USN,RES LAB,DIV OPT SCI,CODE 5670,WASHINGTON,DC 20375, USA. NR 17 TC 36 Z9 38 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 0018-9480 J9 IEEE T MICROW THEORY JI IEEE Trans. Microw. Theory Tech. PD MAR PY 1994 VL 42 IS 3 BP 396 EP 402 DI 10.1109/22.277432 PG 7 WC Engineering, Electrical & Electronic SC Engineering GA NG445 UT WOS:A1994NG44500005 ER PT J AU BANKER, RD KAUFFMAN, RJ WRIGHT, C ZWEIG, D AF BANKER, RD KAUFFMAN, RJ WRIGHT, C ZWEIG, D TI AUTOMATING OUTPUT SIZE AND REUSE METRICS IN A REPOSITORY-BASED COMPUTER-AIDED SOFTWARE ENGINEERING (CASE) ENVIRONMENT SO IEEE TRANSACTIONS ON SOFTWARE ENGINEERING LA English DT Article DE COMPUTER-AIDED SOFTWARE ENGINEERING (CASE); FUNCTION POINT ANALYSIS; OBJECT-BASED DEVELOPMENT; PROGRAMMING PRODUCTIVITY; REPOSITORIES; REUSE; SOFTWARE COSTS; SOFTWARE ENGINEERING ECONOMICS; SOFTWARE METRICS ID PRODUCTIVITY; REUSABILITY; ECONOMICS; INFORMATION; CODE AB Measurement of software development productivity is needed in order to control software costs, but it is discouragingly labor-intensive and expensive. Computer-aided software engineering (CASE) technologies-especially repository-based, integrated CASE-have the potential to support the automation of this measurement. In this paper, we discuss the conceptual basis for the development of automated analyzers for function point and software reuse measurement for object-based CASE. Both analyzers take advantage of the existence of a representation of the application system that is stored within an object repository, and that contains the necessary information about the application system. We also discuss metrics for software reuse measurement, including reuse leverage, reuse value, and reuse classification that are motivated by managerial requirements and the efforts, within industry and the IEEE, to standardize measurement. The functionality and the analytical capabilities of state-of-the art automated software metrics analyzers are illustrated in the context of an investment banking industry application that is similar to systems deployed at the New York City-based investment bank where these tools were developed and tested. C1 NYU,STERN SCH BUSINESS,NEW YORK,NY 10012. SEER TECHNOL,NEW YORK,NY 10001. USN,POSTGRAD SCH,DEPT ADM SCI,MONTEREY,CA 93943. RP BANKER, RD (reprint author), UNIV MINNESOTA,CARLSON SCH MANAGEMENT,MINNEAPOLIS,MN 55455, USA. RI KAUFFMAN, Robert/G-2767-2012 NR 68 TC 16 Z9 16 U1 4 U2 5 PU IEEE COMPUTER SOC PI LOS ALAMITOS PA 10662 LOS VAQUEROS CIRCLE, PO BOX 3014, LOS ALAMITOS, CA 90720-1264 SN 0098-5589 J9 IEEE T SOFTWARE ENG JI IEEE Trans. Softw. Eng. PD MAR PY 1994 VL 20 IS 3 BP 169 EP 187 DI 10.1109/32.268919 PG 19 WC Computer Science, Software Engineering; Engineering, Electrical & Electronic SC Computer Science; Engineering GA NC069 UT WOS:A1994NC06900001 ER PT J AU STEVENSON, RL SCHMITZ, BE DELP, EJ AF STEVENSON, RL SCHMITZ, BE DELP, EJ TI DISCONTINUITY PRESERVING REGULARIZATION OF INVERSE VISUAL PROBLEMS SO IEEE TRANSACTIONS ON SYSTEMS MAN AND CYBERNETICS LA English DT Article ID SURFACE RECONSTRUCTION; COMPUTATIONAL VISION; INVARIANT RECOVERY; SPARSE DATA; RESTORATION AB The method of Tikhonov regularization has been widely used to form well-posed inverse problems in low-level vision. The application of this technique usually results in a least squares approximation or a spline fitting of the parameter of interest. This is often adequate for estimating smooth parameter fields. However, when the parameter of interest has discontinuities the estimate formed by this technique will smooth over the discontinuities. Several techniques have been introduced to modify the regularization process to incorporate discontinuities. Many of these approaches however, will themselves be ill-posed or ill-conditioned. This paper presents a technique for incorporating discontinuities into the reconstruction problem while maintaining a well-posed and well-conditioned problem statement. The resulting computational problem is a convex functional minimization problem. This method will be compared to previous approaches and examples will be presented for the problems of reconstructing curves and surfaces with discontinuities and for estimating image data. Computational issues arising in both analog and digital implementations will also be discussed. C1 PURDUE UNIV, SCH ELECT ENGN, COMP VIS & IMAGE PROC LAB, W LAFAYETTE, IN 47907 USA. USN, RES LAB, WASHINGTON, DC 20375 USA. RP UNIV NOTRE DAME, DEPT ELECT ENGN, IMAGE & SIGNAL ANAL LAB, NOTRE DAME, IN 46556 USA. RI Delp, Edward/C-3616-2013 OI Delp, Edward/0000-0002-2909-7323 NR 55 TC 53 Z9 57 U1 2 U2 2 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI PISCATAWAY PA 445 HOES LANE, PISCATAWAY, NJ 08855-4141 USA SN 0018-9472 J9 IEEE T SYST MAN CYB JI IEEE Trans. Syst. Man Cybern. PD MAR PY 1994 VL 24 IS 3 BP 455 EP 469 DI 10.1109/21.278994 PG 15 WC Computer Science, Cybernetics; Engineering, Electrical & Electronic SC Computer Science; Engineering GA NJ725 UT WOS:A1994NJ72500007 ER PT J AU KARLE, J AF KARLE, J TI THE ROLE OF MOTIVATION IN SCIENTIFIC-RESEARCH .3. THE PATHS OF PROGRESS SO INTERDISCIPLINARY SCIENCE REVIEWS LA English DT Article ID CRYSTAL-STRUCTURE; TAXOL; DIFFRACTION AB The paths of progress in scientific research are often beset with missteps and setbacks. Rarely is progress made without some faltering. In this respect, scientific research is not particularly different from most new undertakings in life. To overcome the missteps and setbacks, persistence is a most important characteristic. Persistence is generated by strong motivations to pursue a particular research problem. It is also maintained by the recognition that apparent missteps and setbacks are often sources of useful information that can help direct a research programme to a desired result. As a consequence, the pursuit of a research goal is generally not a random process. These matters are illustrated by several examples from the literature. Some comments are also included concerning the support of research and the role of society. RP KARLE, J (reprint author), USN,RES LAB,STRUCT MATTER LAB,WASHINGTON,DC 20375, USA. NR 14 TC 4 Z9 4 U1 1 U2 1 PU INST MATERIALS PI LONDON PA 1 CARLTON HOUSE TERRACE, LONDON, ENGLAND SW1Y 5DB SN 0308-0188 J9 INTERDISCIPL SCI REV JI Interdiscip. Sci. Rev. PD MAR PY 1994 VL 19 IS 1 BP 35 EP 41 PG 7 WC Multidisciplinary Sciences; Social Sciences, Interdisciplinary SC Science & Technology - Other Topics; Social Sciences - Other Topics GA PV716 UT WOS:A1994PV71600008 ER PT J AU IBNABDDJALIL, M LOH, IH CHU, CC BLUMENTHAL, N ALEXANDER, H TURNER, D AF IBNABDDJALIL, M LOH, IH CHU, CC BLUMENTHAL, N ALEXANDER, H TURNER, D TI EFFECT OF SURFACE PLASMA TREATMENT ON THE CHEMICAL, PHYSICAL, MORPHOLOGICAL, AND MECHANICAL-PROPERTIES OF TOTALLY ABSORBABLE BONE INTERNAL-FIXATION DEVICES SO JOURNAL OF BIOMEDICAL MATERIALS RESEARCH LA English DT Article ID ATOMIC FORCE MICROSCOPE; PULL-OUT TESTS; SHEAR-STRENGTH; COMPOSITES; INTERFACE; FIBERS; EPOXY AB The purpose of this work was threefold: to enhance the adhesion between the reinforced absorbable calcium phosphate (Cap) fibers and the absorbable polyglycolide acid (PGA) matrix, to improve the hydrolytic degradation of the CaP fibers, and preliminarily to evaluate the cytotoxicity of the plasma treated surface of CaP fibers. A CH4 plasma treatment was used to achieve these goals. The microbond method was used to evaluate the effects of the plasma treatment on the interfacial shear strength between the PGA matrix and CaP fibers. The treatment increased the mean interfacial shear strength of the CaP/PGA composite system by 30%. AFM data showed that CH4-treated CaP fibers had considerable microscopic surface roughness, which facilitated mechanical interlocking between the reinforced CaP fibers and PGA matrix. The untreated and plasma-treated fibers were also subjected to in vitro hydrolytic degradation in a phosphate buffer solution of pH 7.44 at 37 degrees C for up to 15 h. CH4 plasma treatment resulted in a considerable lower polar term of the surface energy and a significantly higher disperse term in water media. This change in the proportion of surface energy terms may reduce the capillary wicking phenomena of water through the CaP fiber/PGA matrix interface. The CaP fiber dissolution studies revealed that both CH4 and Parylene plasma polymer coatings appeared to reduce the solubility of CaP fibers, and that the magnitude of reduction was higher in an acidic than a physiologic pH environment. A preliminary cytotoxicity test revealed that both CH4 and Parylene plasma-treated CaP fibers were noncytotoxic. Additional research should be done to determine the optimum plasma conditions and the possible use of other plasma gases to improve the interfacial shear stress of the composite and the dissolution properties of CaP fibers. (C) 1994 John Wiley and Sons, Inc. C1 ADVANCE SURFACE TECHNOL INC,BILLERICA,MA 01821. CORNELL UNIV,DEPT THEORET & APPL MECH,ITHACA,NY 14853. CORNELL UNIV,DEPT TEXT & APPAREL,ITHACA,NY 14853. HOSP JOINT DIS & MED CTR,INST ORTHOPAED,DEPT BIOENGN,NEW YORK,NY 10003. USN,RES LAB,CTR BIOMOLEC & MAT SCI ENGN,WASHINGTON,DC 20375. FU NIAMS NIH HHS [1R43-AR41086-01] NR 36 TC 22 Z9 23 U1 0 U2 6 PU JOHN WILEY & SONS INC PI NEW YORK PA 605 THIRD AVE, NEW YORK, NY 10158-0012 SN 0021-9304 J9 J BIOMED MATER RES JI J. Biomed. Mater. Res. PD MAR PY 1994 VL 28 IS 3 BP 289 EP 301 DI 10.1002/jbm.820280303 PG 13 WC Engineering, Biomedical; Materials Science, Biomaterials SC Engineering; Materials Science GA MX269 UT WOS:A1994MX26900002 PM 8077244 ER PT J AU KARLE, J AF KARLE, J TI APPLICATIONS OF MATHEMATICS TO STRUCTURAL CHEMISTRY SO JOURNAL OF CHEMICAL INFORMATION AND COMPUTER SCIENCES LA English DT Article; Proceedings Paper CT 5th International Conference on Mathematical Chemistry CY MAY 17-21, 1993 CL UNIV MISSOURI, KANSAS CITY, MO SP INT SOC MATH CHEM, UPJOHN CO, UNIV MISSOURI, CTR INT AFFAIRS, UNIV MISSOURI, OFF GRAD FAC & RES, UNIV MISSOURI, A&S COLL, UNIV MISSOURI, CONTINUING EDUC HO UNIV MISSOURI ID HAUPTMAN AB The main technique for determining molecular structure in the gaseous and crystalline states is diffraction, electron diffraction for gases, and X-ray diffraction for crystals. This article concerns a review of the development of the modern theory for transforming the diffraction data into structural information. Several points are emphasized, namely, the value of introducing mathematical and physical constraints into the analysis, the adjustments that often need to be made in order to apply ideal mathematics to non-ideal experimental data, and how simple concepts that may arise in one technique can be applied with revolutionary effects in a related technique. In the cases considered here the concept of particular interest is nonnegativity. The more complex crystal structures still offer a challenge to the analytical methods. It is pointed out that some of the mathematics that is now decades old continues to offer opportunities, especially with the great progress in computational facilities, to make future advances with structural problems that constitute the present day challenges. RP KARLE, J (reprint author), USN,RES LAB,STRUCT MATTER LAB,WASHINGTON,DC 20375, USA. NR 50 TC 5 Z9 5 U1 1 U2 3 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0095-2338 J9 J CHEM INF COMP SCI JI J. Chem. Inf. Comput. Sci. PD MAR-APR PY 1994 VL 34 IS 2 BP 381 EP 390 DI 10.1021/ci00018a025 PG 10 WC Chemistry, Multidisciplinary; Computer Science, Information Systems; Computer Science, Interdisciplinary Applications SC Chemistry; Computer Science GA ND020 UT WOS:A1994ND02000026 ER PT J AU RATLIFF, PM AF RATLIFF, PM TI THE CONFLICT-POSITIVE ORGANIZATION - TJOSVOLD,D SO JOURNAL OF COMMUNICATION LA English DT Book Review RP RATLIFF, PM (reprint author), UNIV MARYLAND,US NAVY,COLLEGE PK,MD 20742, USA. NR 1 TC 0 Z9 0 U1 0 U2 0 PU OXFORD UNIV PRESS INC PI CARY PA JOURNALS DEPT, 2001 EVANS RD, CARY, NC 27513 SN 0021-9916 J9 J COMMUN JI J. Commun. PD SPR PY 1994 VL 44 IS 2 BP 163 EP 164 PG 2 WC Communication SC Communication GA NJ991 UT WOS:A1994NJ99100016 ER PT J AU DUNN, JH LAMBRAKOS, SG AF DUNN, JH LAMBRAKOS, SG TI CALCULATING COMPLEX INTERACTIONS IN MOLECULAR-DYNAMICS SIMULATIONS EMPLOYING LAGRANGIAN PARTICLE TRACKING SCHEMES SO JOURNAL OF COMPUTATIONAL PHYSICS LA English DT Article AB In this report, we describe some general features of Lagrangian particle tracking and the method of table look-up that are important for calculating many different types of interactions of arbitrary complexity in large molecular dynamics simulations. Based on our experience using these approaches and state-of-the-art of computer technology, we state formally those properties of Lagrangian tracking and table look-up that are important to the design of optimal programming structures. We examine the relationship between Lagrangian indexing and list indexing of data and how this influences the complexity of programming structures for effecting vector operations. Included in this report are criteria for the efficient use of Lagrangian particle tracking schemes in molecular dynamics simulations. (C) 1994 Academic Press, Inc. RP DUNN, JH (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 14 TC 4 Z9 4 U1 0 U2 1 PU ACADEMIC PRESS INC JNL-COMP SUBSCRIPTIONS PI SAN DIEGO PA 525 B ST, STE 1900, SAN DIEGO, CA 92101-4495 SN 0021-9991 J9 J COMPUT PHYS JI J. Comput. Phys. PD MAR PY 1994 VL 111 IS 1 BP 15 EP 23 DI 10.1006/jcph.1994.1039 PG 9 WC Computer Science, Interdisciplinary Applications; Physics, Mathematical SC Computer Science; Physics GA NG688 UT WOS:A1994NG68800002 ER PT J AU KEMMERER, R MEADOWS, C MILLEN, J AF KEMMERER, R MEADOWS, C MILLEN, J TI 3 SYSTEMS FOR CRYPTOGRAPHIC PROTOCOL ANALYSIS SO JOURNAL OF CRYPTOLOGY LA English DT Article DE INTERROGATOR; NARROWER; INATEST; INA-JO; KEY DISTRIBUTION; AUTHENTICATION; SECURITY; PROTOCOLS; FORMAL METHODS; SPECIFICATION; VERIFICATION ID AUTHENTICATION; ENCRYPTION; LOGIC AB Three experimental methods have been developed to help apply formal methods to the security verification of cryptographic protocols of the sort used for key distribution and authentication. Two of these methods are based on Prolog programs, and one is based on a general-purpose specification and verification system. All three combine algebraic with state-transition approaches. For purposes of comparison, they were used to analyze the same example protocol with a known flaw. C1 USN,RES LAB,WASHINGTON,DC 20375. MITRE CORP,BEDFORD,MA 01730. RP KEMMERER, R (reprint author), UNIV CALIF SANTA BARBARA,DEPT COMP SCI,SANTA BARBARA,CA 93106, USA. NR 29 TC 85 Z9 86 U1 0 U2 0 PU SPRINGER VERLAG PI NEW YORK PA 175 FIFTH AVE, NEW YORK, NY 10010 SN 0933-2790 J9 J CRYPTOL JI J. Cryptology PD SPR PY 1994 VL 7 IS 2 BP 79 EP 130 PG 52 WC Computer Science, Theory & Methods; Engineering, Electrical & Electronic; Mathematics, Applied SC Computer Science; Engineering; Mathematics GA NG199 UT WOS:A1994NG19900002 ER PT J AU GADELHAK, M BANDYOPADHYAY, PR AF GADELHAK, M BANDYOPADHYAY, PR TI QUESTIONS IN FLUID-MECHANICS - REYNOLDS-NUMBER EFFECTS IN WALL-BOUNDED FLOWS SO JOURNAL OF FLUIDS ENGINEERING-TRANSACTIONS OF THE ASME LA English DT Editorial Material ID TURBULENT C1 USN,CTR UNDERSEA WARFARE,NEWPORT,RI 02841. RP GADELHAK, M (reprint author), UNIV NOTRE DAME,NOTRE DAME,IN 46556, USA. NR 13 TC 2 Z9 2 U1 0 U2 1 PU ASME-AMER SOC MECHANICAL ENG PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 SN 0098-2202 J9 J FLUID ENG-T ASME JI J. Fluids Eng.-Trans. ASME PD MAR PY 1994 VL 116 IS 1 BP 2 EP 3 DI 10.1115/1.2910237 PG 2 WC Engineering, Mechanical SC Engineering GA NE374 UT WOS:A1994NE37400002 ER PT J AU ROOD, EP AF ROOD, EP TI INTERPRETING VORTEX INTERACTIONS WITH A FREE-SURFACE SO JOURNAL OF FLUIDS ENGINEERING-TRANSACTIONS OF THE ASME LA English DT Article AB An understanding of the process by which vorticity interacts with a free surface is sought by analytical examination of the free-surface condition for the vorticity flux. A novel mechanism is suggested that permits closed vortex loops to evolve into open loops terminating at the free surface. It is hypothesized that abrupt vortex ''disconnection,'' observed in physical experiments, arises from a smooth diffusion of vorticity through the interface, with a necessary coincident tangential acceleration of the interface attributed to viscous forces. RP ROOD, EP (reprint author), OFF NAVAL RES,FLUID DYNAM PROGRAM,ARLINGTON,VA 22217, USA. NR 15 TC 24 Z9 24 U1 0 U2 5 PU ASME-AMER SOC MECHANICAL ENG PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 SN 0098-2202 J9 J FLUID ENG-T ASME JI J. Fluids Eng.-Trans. ASME PD MAR PY 1994 VL 116 IS 1 BP 91 EP 94 DI 10.1115/1.2910248 PG 4 WC Engineering, Mechanical SC Engineering GA NE374 UT WOS:A1994NE37400015 ER PT J AU SMITH, FP KIDWELL, DA AF SMITH, FP KIDWELL, DA TI UNTITLED SO JOURNAL OF FORENSIC SCIENCES LA English DT Letter ID HAIR; ABUSE; DRUGS C1 USN,RES LAB,DIV MED,WASHINGTON,DC 20375. RP SMITH, FP (reprint author), UNIV ALABAMA,GRAD PROGRAM FORENS SCI,BIRMINGHAM,AL 35294, USA. NR 13 TC 0 Z9 0 U1 0 U2 0 PU AMER SOC TESTING MATERIALS PI W CONSHOHOCKEN PA 100 BARR HARBOR DR, W CONSHOHOCKEN, PA 19428-2959 SN 0022-1198 J9 J FORENSIC SCI JI J. Forensic Sci. PD MAR PY 1994 VL 39 IS 2 BP 301 EP 302 PG 2 WC Medicine, Legal SC Legal Medicine GA ND048 UT WOS:A1994ND04800001 PM 8195747 ER PT J AU ROMBERG, RW PAST, MR AF ROMBERG, RW PAST, MR TI REANALYSIS OF FORENSIC URINE SPECIMENS CONTAINING BENZOYLECGONINE AND THC-COOH SO JOURNAL OF FORENSIC SCIENCES LA English DT Article DE TOXICOLOGY; URINE; CHROMATOGRAPHIC ANALYSIS; DRUG TESTING ID STABILITY; TETRAHYDROCANNABINOL; BLOOD AB Drug testing laboratories are often requested to retest specimens that have tested positive. The reproducibility of analytical retest data for delta-9-tetrahydrocannabinol-9-carboxylic acid (THE-COOH) and benzoylecgonine in specimens that had previously been analyzed and then frozen by the Navy Drug Screening Laboratory, Great Lakes is examined in this study. All specimens were tested by gas chromatography/mass spectrometry (GC/MS). Retest values generally showed a decrease in concentration but exhibited considerable variability. Eighty-five THE-COOH positive urine specimens stored frozen for 1 to 10 months (average 2.3 months) declined an average of 25% (range, +30% to -80%) and 61 benzoylecgonine positive urine specimens stored for 1 to 8 months (average 2.3 months) declined an average of 19% (ranged +20% to -100%) from initial GC/MS test results. Drugs were found to partition into strata when frozen in urine because of the thermodynamics of the freezing process. To assure a homogenous solution for repeat testing, specimens that have been frozen and thawed were gently mixed before analysis. C1 USN,DRUG SCREENING LAB,NORFOLK,VA 23511. RP ROMBERG, RW (reprint author), USN,DRUG SCREENING LAB,GREAT LAKES,IL 60088, USA. NR 8 TC 18 Z9 21 U1 0 U2 1 PU AMER SOC TESTING MATERIALS PI W CONSHOHOCKEN PA 100 BARR HARBOR DR, W CONSHOHOCKEN, PA 19428-2959 SN 0022-1198 J9 J FORENSIC SCI JI J. Forensic Sci. PD MAR PY 1994 VL 39 IS 2 BP 479 EP 485 PG 7 WC Medicine, Legal SC Legal Medicine GA ND048 UT WOS:A1994ND04800020 PM 8195759 ER PT J AU WEBB, DF HOWARD, RA AF WEBB, DF HOWARD, RA TI THE SOLAR-CYCLE VARIATION OF CORONAL MASS EJECTIONS AND THE SOLAR-WIND MASS FLUX SO JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS LA English DT Article ID X-RAY EVENTS; INTERPLANETARY SHOCKS; HELIOS SPACECRAFT; MAXIMUM MISSION; II BURSTS; TRANSIENTS; ASSOCIATIONS; EVOLUTION; FLARES; 1-AU AB Coronal mass ejections (CMEs) are an important aspect of coronal physics and a potentially significant contributor to perturbations of the solar wind, such as its mass flux. Sufficient data on CMEs are now available to permit study of their longer-term occurrence patterns. Here we present the results of a study of CME occurrence rates over more than a complete 11-year solar sunspot cycle and a comparison of these rates with those of other activity related to CMEs and with the solar wind particle flux at 1 AU. The study includes an evaluation of corrections to the CME rates, which include instrument duty cycles, visibility functions, mass detection thresholds, and geometrical considerations. The main results are as follows: (1) The frequency of occurrence of CMEs tends to track the solar activity cycle in both amplitude and phase; (2) the CME rates from different instruments, when corrected for both duty cycles and visibility functions, are reasonably consistent; (3) considering only longer-term averages, no one class of solar activity is better correlated with CME rate than any other; (4) the ratio of the annualized CME to solar wind mass flux tends to track the solar cycle; and (5) near solar maximum, CMEs can provide a significant fraction (i.e., almost-equal-to 15%) of the average mass flux to the near-ecliptic solar wind. C1 USN, RES LAB, WASHINGTON, DC 20375 USA. BOSTON COLL, INST SPACE RES, NEWTON, MA USA. NR 61 TC 245 Z9 248 U1 0 U2 6 PU AMER GEOPHYSICAL UNION PI WASHINGTON PA 2000 FLORIDA AVE NW, WASHINGTON, DC 20009 USA SN 2169-9380 EI 2169-9402 J9 J GEOPHYS RES-SPACE JI J. Geophys. Res-Space Phys. PD MAR 1 PY 1994 VL 99 IS A3 BP 4201 EP 4220 DI 10.1029/93JA02742 PG 20 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA MZ639 UT WOS:A1994MZ63900033 ER PT J AU PHILLIPS, AT ROSEN, JB AF PHILLIPS, AT ROSEN, JB TI A QUADRATIC ASSIGNMENT FORMULATION OF THE MOLECULAR-CONFORMATION PROBLEM SO JOURNAL OF GLOBAL OPTIMIZATION LA English DT Article DE MOLECULAR CONFORMATION; CONSTRAINED GLOBAL MINIMIZATION; QUADRATIC ASSIGNMENT PROBLEM ID ALGORITHM AB The molecular conformation problem is discussed, and a concave quadratic global minimization approach for solving it is described. This approach is based on a quadratic assignment formulation of a discrete approximation to the original problem. C1 USN ACAD,DEPT COMP SCI,ANNAPOLIS,MD 21402. UNIV MINNESOTA,DEPT COMP SCI,MINNEAPOLIS,MN 55455. NR 16 TC 34 Z9 36 U1 0 U2 0 PU KLUWER ACADEMIC PUBL PI DORDRECHT PA SPUIBOULEVARD 50, PO BOX 17, 3300 AA DORDRECHT, NETHERLANDS SN 0925-5001 J9 J GLOBAL OPTIM JI J. Glob. Optim. PD MAR PY 1994 VL 4 IS 2 BP 229 EP 241 DI 10.1007/BF01096724 PG 13 WC Operations Research & Management Science; Mathematics, Applied SC Operations Research & Management Science; Mathematics GA NA679 UT WOS:A1994NA67900007 ER PT J AU WALLACE, MR OLDFIELD, EC AF WALLACE, MR OLDFIELD, EC TI PROSPECTIVE EVALUATION OF RED MAN SYNDROME SO JOURNAL OF INFECTIOUS DISEASES LA English DT Letter C1 USN,MED CTR,DEPT INTERNAL MED,DIV INFECT DIS,SAN DIEGO,CA. RP WALLACE, MR (reprint author), USN,MED CTR,DEPT CLIN INVEST,SAN DIEGO,CA 92134, USA. NR 3 TC 0 Z9 0 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 1994 VL 169 IS 3 BP 700 EP 700 PG 1 WC Immunology; Infectious Diseases; Microbiology SC Immunology; Infectious Diseases; Microbiology GA NP109 UT WOS:A1994NP10900044 PM 8158057 ER PT J AU MERWIN, LH JOHNSON, CE WEIMER, WA AF MERWIN, LH JOHNSON, CE WEIMER, WA TI C-13 NMR INVESTIGATION OF CVD DIAMOND - CORRELATION OF NMR AND RAMAN SPECTRAL LINEWIDTHS SO JOURNAL OF MATERIALS RESEARCH LA English DT Article ID NUCLEAR-MAGNETIC-RESONANCE; CHEMICAL VAPOR-DEPOSITION; POLYCRYSTALLINE DIAMOND; INFRARED-ABSORPTION; HOT-FILAMENT; THIN-FILMS; SPECTROSCOPY; HYDROGEN; POLARIZATION AB Six CVD diamond thin films were examined by magic angle spinning (MAS) C-13 nuclear magnetic resonance (NMR), Raman, and electron spin resonance spectroscopy. The use of film samples cut to the diameter of the magic-angle spinning rotor provided ease of spinning and the opportunity to obtain good signal-to-noise spectra in 4 to 16 h. MAS NMR linewidths exhibit a linear correlation with Raman linewidths and reflect the optical quality of the material. Residual MAS NMR linewidths most likely arise from a combination of crystal defect sites and paramagnetic effects. RP MERWIN, LH (reprint author), USN,CTR AIR WARFARE,DIV WEAP,RES DEPT,DIV CHEM,CHINA LAKE,CA 93555, USA. NR 24 TC 11 Z9 11 U1 0 U2 5 PU MATERIALS RESEARCH SOCIETY PI PITTSBURGH PA 9800 MC KNIGHT ROAD SUITE 327, PITTSBURGH, PA 15237 SN 0884-2914 J9 J MATER RES JI J. Mater. Res. PD MAR PY 1994 VL 9 IS 3 BP 631 EP 635 DI 10.1557/JMR.1994.0631 PG 5 WC Materials Science, Multidisciplinary SC Materials Science GA MZ039 UT WOS:A1994MZ03900014 ER PT J AU DRIELS, M TURKEGENCI, Y AF DRIELS, M TURKEGENCI, Y TI SELECTIVE BACKDRIVEABILITY AND ITS APPLICATION TO A ROBOTIC FINGER DESIGN SO JOURNAL OF MECHANICAL DESIGN LA English DT Article AB The work reported covers the design of a prototype finger unit which will be part of a dexterous robotic hand design. Unlike conventional designs for contemporary hands which use tendons to actuate individual finger joints, this design uses small electric motors located in the finger units themselves. Because of high gear ratios in the final drive, the finger is able to sustain a grasp with power removed. An implementation of compliant joint control is discussed, and it is shown that this results in an actuation system which not only has variable stiffness control, but one in which the systems inability to be backdriven may be eliminated for those tasks where it is advantageous to do so. RP DRIELS, M (reprint author), USN,POSTGRAD SCH,DEPT MECH ENGN,MONTEREY,CA 93943, USA. NR 0 TC 0 Z9 0 U1 1 U2 1 PU ASME-AMER SOC MECHANICAL ENG PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 SN 1050-0472 J9 J MECH DESIGN JI J. Mech. Des. PD MAR PY 1994 VL 116 IS 1 BP 44 EP 46 DI 10.1115/1.2919374 PG 3 WC Engineering, Mechanical SC Engineering GA NE874 UT WOS:A1994NE87400007 ER PT J AU ABBASSY, MM STEIN, KJ OSMAN, M AF ABBASSY, MM STEIN, KJ OSMAN, M TI NEW ARTIFICIAL FEEDING TECHNIQUE FOR EXPERIMENTAL-INFECTION OF ARGAS TICKS (ACARI, ARGASIDAE) SO JOURNAL OF MEDICAL ENTOMOLOGY LA English DT Article DE ARGAS; FETAL BOVINE SERUM; SKIN AB An artificial feeding technique using fetal bovine serum as a food source was established for the demonstration of West Nile virus transmission by Argas ticks in susceptibility studies. Fetal bovine serum does not coagulate and is free from contaminating microorganisms, antibodies, and anticoagulants, which are all known to reduce virus titers. This technique also compensates for the lack of suitable laboratory hosts as well as problems associated with disease agents, such as viruses that may not produce illness or antibodies after virus exposures. C1 USN, DIV MED ZOOL, MED RES UNIT 3, FPO, AE 09835 USA. NR 15 TC 6 Z9 7 U1 0 U2 1 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 1994 VL 31 IS 2 BP 202 EP 205 PG 4 WC Entomology; Veterinary Sciences SC Entomology; Veterinary Sciences GA MZ394 UT WOS:A1994MZ39400004 PM 8189410 ER PT J AU PAPOULIAS, FA MCKINLEY, BD AF PAPOULIAS, FA MCKINLEY, BD TI INVERTED PENDULUM STABILIZATION OF SUBMARINES IN FREE POSITIVE BUOYANCY ASCENT SO JOURNAL OF SHIP RESEARCH LA English DT Article AB The problem of steady-state vertical ascent of a submarine with excess buoyancy is analyzed. All possible vertical plane solutions are computed and their stability is established in both in-plane and out-of-plane perturbations. Divergence of trajectories, sensitivity of solutions to initial conditions, and stable inverted pendulum configurations are shown to exist for certain ranges of parameters. RP PAPOULIAS, FA (reprint author), USN,DEPT MECH ENGN,MONTEREY,CA 93940, USA. NR 0 TC 5 Z9 8 U1 0 U2 1 PU SOC NAVAL ARCH MARINE ENG PI JERSEY CITY PA 601 PAVONIA AVENUE, JERSEY CITY, NJ 07306 SN 0022-4502 J9 J SHIP RES JI J. Ship Res. PD MAR PY 1994 VL 38 IS 1 BP 71 EP 82 PG 12 WC Engineering, Marine; Engineering, Civil SC Engineering GA NA323 UT WOS:A1994NA32300007 ER PT J AU BREEMER, JS AF BREEMER, JS TI THE BURDEN OF TRAFALGAR - DECISIVE BATTLE AND NAVAL STRATEGIC EXPECTATIONS ON THE EVE OF WORLD-WAR-1 SO JOURNAL OF STRATEGIC STUDIES LA English DT Article RP BREEMER, JS (reprint author), USN,POSTGRAD SCH,DEPT NATL SECUR AFFAIRS,MONTEREY,CA 93940, USA. NR 66 TC 1 Z9 1 U1 0 U2 1 PU FRANK CASS CO LTD PI LONDON PA 11 GAINSBOROUGH ROAD, LONDON, ENGLAND E11 1RS SN 0140-2390 J9 J STRATEGIC STUD JI J. Strateg. Stud. PD MAR PY 1994 VL 17 IS 1 BP 33 EP 62 DI 10.1080/01402399408437539 PG 30 WC International Relations; Political Science SC International Relations; Government & Law GA NY635 UT WOS:A1994NY63500003 ER PT J AU LIM, R AF LIM, R TI SCATTERING BY AN OBSTACLE IN A PLANE-STRATIFIED POROELASTIC MEDIUM - APPLICATION TO AN OBSTACLE IN OCEAN SEDIMENTS SO JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA LA English DT Article ID DYNAMIC PERMEABILITY; POROUS-MEDIA; SPHERICAL INHOMOGENEITY; MULTIPLE-SCATTERING; ABSORBING MEDIA; ACOUSTIC-WAVE; FLUID AB A transition-matrix formulation of the field scattered by a bounded three-dimensional obstacle buried in a plane-stratified, saturated, poroelastic environment is described. The formulation yields an exact solution of the vector Blot equations, obeying all boundary conditions prescribed on the layer and obstacle boundaries. This is obtained by combining the recently derived free-field transition matrix for an obstacle in a porous medium [S. G. Kargl and R. Lim, J. Acoust. Sec. Am. 94, 1527-1550 (1993)] with a generalization of existing acoustic waveguide solutions. The present solution is numerically implemented for an aluminum sphere buried in an ocean sediment half-space and insonified by an acoustic source in an overlying water half-space. Attention is paid to assessing the contribution of shear waves and slow compressional waves to the predicted backscatter. RP LIM, R (reprint author), USN,CTR SURFACE WARFARE,DAHLGREN DIV,COASTAL SYST STN,PANAMA CITY,FL 32407, USA. NR 47 TC 16 Z9 16 U1 0 U2 1 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0001-4966 J9 J ACOUST SOC AM JI J. Acoust. Soc. Am. PD MAR PY 1994 VL 95 IS 3 BP 1223 EP 1244 DI 10.1121/1.408566 PG 22 WC Acoustics; Audiology & Speech-Language Pathology SC Acoustics; Audiology & Speech-Language Pathology GA NA773 UT WOS:A1994NA77300004 ER PT J AU MAIDANIK, G DICKEY, J AF MAIDANIK, G DICKEY, J TI FLEXURAL RESPONSE MATRIX FOR RIBBED PANELS SO JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA LA English DT Article AB The formalism of the response of a ribbed membranelike panel that carries a single propagation type is recalled. The equation of motion is cast in a scalar form. The formalism is then extended to a ribbed membranelike panel that simultaneously carries two propagation types. The equation of motion is cast in a matrix form of rank 2. The formalism of the flexural response of a ribbed plate also admits to a matrix form of rank 2 and is akin to the formalism of the panel that carries two propagation types. However, fundamental differences also exist between these two formalisms. These differences are discussed and examined. RP MAIDANIK, G (reprint author), NSWC,CARDEROCK DIV,BETHESDA,MD 20084, USA. NR 7 TC 0 Z9 0 U1 0 U2 0 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0001-4966 J9 J ACOUST SOC AM JI J. Acoust. Soc. Am. PD MAR PY 1994 VL 95 IS 3 BP 1245 EP 1255 DI 10.1121/1.408567 PG 11 WC Acoustics; Audiology & Speech-Language Pathology SC Acoustics; Audiology & Speech-Language Pathology GA NA773 UT WOS:A1994NA77300005 ER PT J AU ATCHLEY, AA KUO, FM AF ATCHLEY, AA KUO, FM TI STABILITY CURVES FOR A THERMOACOUSTIC PRIME MOVER SO JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA LA English DT Article ID DRIVEN ACOUSTIC-OSCILLATIONS; SELF-OSCILLATION; ONSET AB The purpose of this paper is to investigate the stability curves of the fundamental and second modes in a helium filled prime mover. The predicted and measured stability limits are in reasonable agreement for both modes at most mean pressures. There is, however, evidence that the stability of one mode is affected by the presence of the other. It is also observed that one mode can suppress the other. Measurements are also reported on a prime mover modified to selectively inhibit the fundamental mode. Results indicate that the reduced fundamental amplitude allows the stability curve for the second mode to extend into the regions where the fundamental mode previously dominated. This produces a region where both modes are simultaneously excited. Analysis of the waveforms show that the resulting oscillations are quasiperiodic. RP ATCHLEY, AA (reprint author), USN,POSTGRAD SCH,DEPT PHYS,MONTEREY,CA 93943, USA. NR 5 TC 27 Z9 31 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 MAR PY 1994 VL 95 IS 3 BP 1401 EP 1404 DI 10.1121/1.408580 PG 4 WC Acoustics; Audiology & Speech-Language Pathology SC Acoustics; Audiology & Speech-Language Pathology GA NA773 UT WOS:A1994NA77300020 ER PT J AU PFLUG, LA IOUP, GE IOUP, JW FIELD, RL AF PFLUG, LA IOUP, GE IOUP, JW FIELD, RL TI PREFILTERING FOR IMPROVED CORRELATION DETECTION OF BAND-LIMITED TRANSIENT SIGNALS SO JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA LA English DT Article ID HIGHER-ORDER CORRELATIONS; DETERMINISTIC TRANSIENTS; SPECTRA; BISPECTRUM; NOISE AB Prefiltering, or limiting the passband of a received signal, can be used to improve ordinary correlation threshold detector performance for an unknown source model. For the known source model, the cross-correlation detector is equivalent to matched filtering, and intrinsically contains prefiltering. Prefiltering also improves higher-order correlation threshold detector performance, but often with more advantage than seen in the ordinary correlation detector. This is true for both the unknown and known source models. Geometric interpretations are given to provide insight into the origin of potential higher-order advantage. Eight energy signals, each with three different Fourier magnitude-based filters, are used to test the cross-correlation, bicorrelation, and tricorrelation detectors by Monte Carlo simulation and hypothesis testing. Significant signal-to-noise ratio (SNR) gains are evident for both the known and unknown source models with the tricorrelation exhibiting the largest gains. The tricorrelation detector has superior performance versus the cross-correlation detector for all the eight test signals in the unknown source case, and was superior for seven of the eight test signals in the known source case. For the narrow pulse test signal, a probability of detection of 0.5 at probability of false alarm 0.001 was achieved at a power SNR -23.57 dB in the known source model, and at SNR -20.28 dB in the unknown source model. Some other test signals have lower SNRs in the unknown source model. Higher-order detectors can be limited to have equivalent information to that of the ordinary correlation detector. An example illustrating this case is given. C1 UNIV NEW ORLEANS,DEPT PHYS,NEW ORLEANS,LA 70148. RP PFLUG, LA (reprint author), STENNIS SPACE CTR,NAVAL RES LAB,BAY ST LOUIS,MS 39529, USA. NR 23 TC 5 Z9 5 U1 0 U2 0 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0001-4966 J9 J ACOUST SOC AM JI J. Acoust. Soc. Am. PD MAR PY 1994 VL 95 IS 3 BP 1459 EP 1473 DI 10.1121/1.408587 PG 15 WC Acoustics; Audiology & Speech-Language Pathology SC Acoustics; Audiology & Speech-Language Pathology GA NA773 UT WOS:A1994NA77300028 ER PT J AU BROADHEAD, MK ALI, HB BIBEE, LD AF BROADHEAD, MK ALI, HB BIBEE, LD TI SHEAR-Q ESTIMATES FROM INTERFACE WAVES IN MARINE-SEDIMENTS SO JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA LA English DT Letter AB Scholte wave arrivals at two diverse test sites were analyzed with the spectral ratio method to obtain estimates of average shear e of deep sea bottom sediments. The Scholte waves were generated by bottom-located explosive charges and recorded on ocean bottom seismometers. The results obtained are compared to Q estimates reported in the literature. RP BROADHEAD, MK (reprint author), STENNIS SPACE CTR,NAVAL RES LAB,MISSISSIPPI STATE,MS 39529, USA. NR 6 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 0001-4966 J9 J ACOUST SOC AM JI J. Acoust. Soc. Am. PD MAR PY 1994 VL 95 IS 3 BP 1650 EP 1653 DI 10.1121/1.408551 PG 4 WC Acoustics; Audiology & Speech-Language Pathology SC Acoustics; Audiology & Speech-Language Pathology GA NA773 UT WOS:A1994NA77300046 ER PT J AU CHIU, CS AF CHIU, CS TI DOWNSLOPE MODAL ENERGY-CONVERSION SO JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA LA English DT Letter AB The significance of energy transfer between acoustic normal modes as they propagate downslope in a refractive sound channel is investigated. Specifically, two criteria for effective conversion of sound energy from high to low modes are established. In addition, the results from three simulation case studies are presented. These results show that for a low-frequency (70-Hz) bottom-lying sound source, the conversion of energy to the lowest modes is significant when the source depth is shallow. However such conversion does not occur when the depth of a bottom-lying source is near the axis of the deep sound channel. RP CHIU, CS (reprint author), USN,POSTGRAD SCH,DEPT OCEANOG,CODE OC CI,MONTEREY,CA 93943, USA. NR 5 TC 7 Z9 7 U1 0 U2 0 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0001-4966 J9 J ACOUST SOC AM JI J. Acoust. Soc. Am. PD MAR PY 1994 VL 95 IS 3 BP 1654 EP 1657 DI 10.1121/1.408552 PG 4 WC Acoustics; Audiology & Speech-Language Pathology SC Acoustics; Audiology & Speech-Language Pathology GA NA773 UT WOS:A1994NA77300047 ER PT J AU ATCHLEY, AA AF ATCHLEY, AA TI ANALYSIS OF THE INITIAL BUILDUP OF OSCILLATIONS IN A THERMOACOUSTIC PRIME MOVER SO JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA LA English DT Letter ID SELF-OSCILLATION; ONSET AB Previously, the evolution of the quality factor Q of a prime mover below onset of self-oscillation as a function of the temperature difference applied across the prime mover stack was discussed [A. A. Atchley, H. E. Bass, T. J. Hofler, and H. T. Lin, ''Study of a thermoacoustic prime mover below onset of self-oscillation,'' J. Acoust. Sec. Am. 91, 734-743 (1992) and A. A. Atchley, ''Standing wave analysis of a thermoacoustic prime mover below onset of self-oscillation,'' J. Acoust. Sec. Am. 92, 2907-2914 (1992)]. In this paper, these measurements are extended through onset. Above onset Q is determined from measurements of the rise time of the initial buildup of the acoustic oscillations. These measurements, coupled with those previously reported for below onset conditions, show the complete evolution of Q for an individual prime mover from below to above onset. The measurements are in good agreement with the predictions of a standing wave analysis of prime movers discussed in the earlier work. It is suggested that measurements of the buildup of oscillations might be used to study factors that determine steady-state oscillation amplitude in prime movers. RP ATCHLEY, AA (reprint author), USN,POSTGRAD SCH,DEPT PHYS,MONTEREY,CA 93943, USA. NR 13 TC 27 Z9 32 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 1994 VL 95 IS 3 BP 1661 EP 1664 DI 10.1121/1.408554 PG 4 WC Acoustics; Audiology & Speech-Language Pathology SC Acoustics; Audiology & Speech-Language Pathology GA NA773 UT WOS:A1994NA77300049 ER PT J AU JEWELL, JM HIGBY, PL AGGARWAL, ID AF JEWELL, JM HIGBY, PL AGGARWAL, ID TI PROPERTIES OF BAO-R2O3-GA2O3-GEO2 (R=Y, AL, LA, AND GD) GLASSES SO JOURNAL OF THE AMERICAN CERAMIC SOCIETY LA English DT Article ID LANTHANUM BORATE GLASSES; ALUMINOSILICATE GLASSES; GALLOSILICATE; TEMPERATURE; TRANSITION; VISCOSITY AB Barium gallogermanate glasses were prepared with substitutions of Al2O3, Y2O3, La2O3, and Gd2O3 for Ga2O3. The effects of these substitutions on the glass transformation temperature, viscosity, thermal expansion, and molar volume have been determined. The changes in properties associated with each substitutional ion are consistent with structural roles reported for these ions in other glasses. Aluminum acts as an intermediate with [AlO4-] tetrahedra substituting directly for [GaO4-] tetrahedra. Yttrium and gadolinium act as ''atypical'' modifier ions because of their large field strengths. Finally, the properties of the La2O3-substituted glasses indicate a possible dual structural role for La3+ ions in these glasses. RP JEWELL, JM (reprint author), USN,RES LAB,DIV OPT SCI,OPT MAT RES GRP,CODE 5603,WASHINGTON,DC 20375, USA. NR 25 TC 39 Z9 41 U1 1 U2 14 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 MAR PY 1994 VL 77 IS 3 BP 697 EP 700 DI 10.1111/j.1151-2916.1994.tb05351.x PG 4 WC Materials Science, Ceramics SC Materials Science GA NB055 UT WOS:A1994NB05500012 ER PT J AU XIA, JQ JORDAN, AK KONG, JA AF XIA, JQ JORDAN, AK KONG, JA TI ELECTROMAGNETIC INVERSE-SCATTERING THEORY FOR INHOMOGENEOUS DIELECTRICS - THE LOCAL REFLECTION MODEL SO JOURNAL OF THE OPTICAL SOCIETY OF AMERICA A-OPTICS IMAGE SCIENCE AND VISION LA English DT Article ID RENORMALIZATION; PROFILES AB The electromagnetic inverse-scattering problem is solved by use of a local reflection model in inhomogeneous media. New renormalized perturbation solutions in explicit forms are obtained for reconstruction of dielectric profiles from the global reflection coefficient at the surface of the medium. A coordinate recovery transform is introduced for rigorous recovery of the geometric lengths from the stretched coordinates in the inversion procedure. Explicit solutions from the Green's-function approach and the spectral theory are unified with the local reflection model. Numerical inversion is performed on band-limited reflection coefficients in the frequency domain. C1 USN,RES LAB,DIV REMOTE SENSING,WASHINGTON,DC 20375. MIT,DEPT ELECT ENGN & COMP SCI,CAMBRIDGE,MA 02139. RP XIA, JQ (reprint author), SCHLUMBERGER DOLL RES CTR,OLD QUARRY RD,RIDGEFIELD,CT 06877, USA. NR 13 TC 15 Z9 17 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 MAR PY 1994 VL 11 IS 3 BP 1081 EP 1086 DI 10.1364/JOSAA.11.001081 PG 6 WC Optics SC Optics GA MZ514 UT WOS:A1994MZ51400011 ER PT J AU TENNENBAUM, SY LERNER, SE MCALEER, IM PACKER, MG SCHERZ, HC KAPLAN, GW AF TENNENBAUM, SY LERNER, SE MCALEER, IM PACKER, MG SCHERZ, HC KAPLAN, GW TI PREOPERATIVE LAPAROSCOPIC LOCALIZATION OF THE NONPALPABLE TESTIS - A CRITICAL ANALYSIS OF A 10-YEAR EXPERIENCE SO JOURNAL OF UROLOGY LA English DT Article DE TESTIS; PERITONEOSCOPY; CRYPTORCHIDISM ID UNDESCENDED TESTIS; SPERMATIC VENOGRAPHY; IMPALPABLE TESTIS; MANAGEMENT; ORCHIOPEXY; CRYPTORCHIDISM; TOMOGRAPHY; VESSELS AB Laparoscopy was performed on 107 patients 8 months to 18.5 years old (mean age 46.9 months) with 119 nonpalpable testes. The procedure accurately determined the location of the gonad in 95.3% of the patients, while 16 were spared formal surgical exploration with the laparoscopic visualization of blind-ending spermatic vessels and vasa deferentia. Additionally, patency of the internal inguinal ring, determined laparoscopically, was an accurate predictor of testicular salvageability. We advocate the use of laparoscopy for all boys with a nonpalpable gonad in conjunction with operative intervention if necessary. C1 ALBERT EINSTEIN COLL MED,JACK D WEILER HOSP,MONTEFIORE MED CTR,DEPT UROL,BRONX,NY. USN,MED CTR,DEPT UROL,BETHESDA,MD 20814. CHILDRENS HOSP & HLTH CTR,SAN DIEGO MED CTR,DEPT UROL,SAN DIEGO,CA. NR 33 TC 45 Z9 45 U1 0 U2 0 PU WILLIAMS & WILKINS PI BALTIMORE PA 351 WEST CAMDEN ST, BALTIMORE, MD 21201-2436 SN 0022-5347 J9 J UROLOGY JI J. Urol. PD MAR PY 1994 VL 151 IS 3 BP 732 EP 734 PG 3 WC Urology & Nephrology SC Urology & Nephrology GA MW725 UT WOS:A1994MW72500063 PM 7905934 ER PT J AU JENSEN, KL GANGULY, AK AF JENSEN, KL GANGULY, AK TI TIME-DEPENDENT, SELF-CONSISTENT SIMULATIONS OF FIELD-EMISSION FROM SILICON USING THE WIGNER DISTRIBUTION FUNCTION SO JOURNAL OF VACUUM SCIENCE & TECHNOLOGY B LA English DT Article ID QUANTUM-TRANSPORT; DEVICES AB Field emission current calculations from semiconductors typically rely on the assumptions that the emitted current is negligible and that the band bending at the surface may be calculated via Poisson's equation with a Fermi-Dirac momentum distribution of electrons [the zero emitted current approximation (ZECA)]. This approach cannot take into account complications due to quantum confinement near the surface, and problems associated with scattering for large applied field. We have developed and applied a time-dependent, self-consistently calculated Wigner distribution function (WDF) approach for dealing with the semiconductor field emission problem, and have applied it to the case of silicon for the cases of 300 and 900 K. In particular, effects of self-consistency and scattering on the density and potential profiles were examined, comparing the results to the ZECA approach to show when quantum and scattering effects become significant. At low fields, the WDF approach may be coupled with the transmission coefficient approach to yield reasonable current estimates. At high fields, it is shown that current saturation effects set in, in which the current no longer exponentially rises with applied field. Finally, the time dependence of the current and particle densities after a sudden shift in the applied field are examined. 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 17 TC 18 Z9 18 U1 0 U2 0 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 1071-1023 J9 J VAC SCI TECHNOL B JI J. Vac. Sci. Technol. B PD MAR-APR PY 1994 VL 12 IS 2 BP 770 EP 775 DI 10.1116/1.587344 PG 6 WC Engineering, Electrical & Electronic; Nanoscience & Nanotechnology; Physics, Applied SC Engineering; Science & Technology - Other Topics; Physics GA NG711 UT WOS:A1994NG71100049 ER PT J AU JENSEN, KL ZAIDMAN, EG AF JENSEN, KL ZAIDMAN, EG TI FIELD-EMISSION FROM AN ELLIPTIC BOSS - EXACT AND APPROXIMATE FORMS FOR AREA FACTORS AND CURRENTS SO JOURNAL OF VACUUM SCIENCE & TECHNOLOGY B LA English DT Article AB Field emission from metallic or semiconductor tips, in comparison to planar surfaces, is complicated by current enhancement effects and changes in the image charge. It is shown that the approximations typically used for the calculation of the transmission coefficient, namely, a ''linearized'' Wentzel-Kramers-Brillouin approach and methods based upon the Fowler-Nordheim approach, are inappropriate for small spherical surfaces but adequate for elliptical surfaces. The derivation of the approximate approaches is given, as well as a simple analytical formula for the average emitting area, which may be derived based on the Fowler-Nordheim equation. By use of the elliptical approximation for the tip geometry, a simple scale factor is sufficient to deal with spherical and pointed tips. 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 13 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 1071-1023 J9 J VAC SCI TECHNOL B JI J. Vac. Sci. Technol. B PD MAR-APR PY 1994 VL 12 IS 2 BP 776 EP 780 DI 10.1116/1.587345 PG 5 WC Engineering, Electrical & Electronic; Nanoscience & Nanotechnology; Physics, Applied SC Engineering; Science & Technology - Other Topics; Physics GA NG711 UT WOS:A1994NG71100050 ER PT J AU TANG, CM LAU, YY SWYDEN, TA AF TANG, CM LAU, YY SWYDEN, TA TI DEFLECTION MICROWAVE AND MILLIMETER-WAVE AMPLIFIERS SO JOURNAL OF VACUUM SCIENCE & TECHNOLOGY B LA English DT Article ID FIELD-EMISSION; ARRAYS AB A new class of microwave and millimeter-wave amplifiers, called deflectron amplifiers, which are based on the deflection of low voltage electron beams in a microstructure were analyzed. This concept may be applied in two ways: as microelectronic amplifiers or as bunched beam cathodes to power conventional amplifier configurations such as klystrodes and traveling wave tubes. Estimates for gain and efficiency are obtained from a circuit analysis. Particle codes are used to test the viability of the concept. Frequencies of operation are projected up to a few tens of GHz for microelectronic amplifiers and up to approximately 80 GHZ for power amplifiers. C1 OMEGA P INC,NEW HAVEN,CT 06520. UNIV MICHIGAN,DEPT NUCL ENGN,ANN ARBOR,MI 48109. FM TECHNOL INC,FAIRFAX,VA 22032. RP TANG, CM (reprint author), USN,RES LAB,DIV PLASMA PHYS,WASHINGTON,DC 20375, USA. NR 27 TC 3 Z9 3 U1 0 U2 1 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 1071-1023 J9 J VAC SCI TECHNOL B JI J. Vac. Sci. Technol. B PD MAR-APR PY 1994 VL 12 IS 2 BP 790 EP 794 DI 10.1116/1.587348 PG 5 WC Engineering, Electrical & Electronic; Nanoscience & Nanotechnology; Physics, Applied SC Engineering; Science & Technology - Other Topics; Physics GA NG711 UT WOS:A1994NG71100053 ER PT J AU KATZER, DS SHANABROOK, BV GAMMON, D AF KATZER, DS SHANABROOK, BV GAMMON, D TI RAMAN-SCATTERING STUDY OF THE INTERMIXING OF ALAS MONOLAYERS IN GAAS GROWN BY MOLECULAR-BEAM EPITAXY SO JOURNAL OF VACUUM SCIENCE & TECHNOLOGY B LA English DT Article; Proceedings Paper CT 13th North American Conference on Molecular-Beam Epitaxy CY SEP 13-15, 1993 CL STANFORD UNIV, STANFORD, CA SP AMER VACUUM SOC HO STANFORD UNIV ID QUANTUM-WELL STRUCTURES; INTERFACES AB In this article we present results from a Raman scattering study of AlAs monolayers in GaAs grown by molecular beam epitaxy. A recent model for the LO phonons in AlxGa1-xAs developed by Molinari et al. [Appl. Surf. Sci. 56-58, 617 (1992); Phys. Rev. B 45. 4280 (1992)] gives excellent qualitative agreement with our measurements, We show that intermixing between AlAs and GaAs is reduced through the use of low substrate temperatures and migration-enhanced epitaxy. We show the utility of the LO phonon model for obtaining quantitative information about the Al concentration in a monolayer. We also discuss the utility of using Raman scattering to help determine the optimum growth conditions to minimize intermixing of GaAs/AlAs interfaces and for mapping Al flux variations across a sample. C1 USN,RES LAB,DIV ELECTR SCI & TECHNOL,ELECTR MAT BRANCH,WASHINGTON,DC 20375. RP KATZER, DS (reprint author), USN,RES LAB,DIV ELECTR SCI & TECHNOL,MICROWAVE TECHNOL BRANCH,WASHINGTON,DC 20375, USA. RI Katzer, D. Scott/N-7841-2013 NR 8 TC 3 Z9 3 U1 0 U2 2 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 1071-1023 J9 J VAC SCI TECHNOL B JI J. Vac. Sci. Technol. B PD MAR-APR PY 1994 VL 12 IS 2 BP 1056 EP 1058 DI 10.1116/1.587086 PG 3 WC Engineering, Electrical & Electronic; Nanoscience & Nanotechnology; Physics, Applied SC Engineering; Science & Technology - Other Topics; Physics GA NG711 UT WOS:A1994NG71100107 ER PT J AU SUN, DC TOWE, E BENNETT, BR AF SUN, DC TOWE, E BENNETT, BR TI STUDY OF LATTICE-MISMATCHED (IN,GA)AS/GAAS HETEROSTRUCTURES ON THE UNCONVENTIONAL (110) GAAS SURFACE SO JOURNAL OF VACUUM SCIENCE & TECHNOLOGY B LA English DT Article; Proceedings Paper CT 13th North American Conference on Molecular-Beam Epitaxy CY SEP 13-15, 1993 CL STANFORD UNIV, STANFORD, CA SP AMER VACUUM SOC HO STANFORD UNIV ID STRAINED-LAYER SUPERLATTICES; QUANTUM-WELLS; OPTICAL-PROPERTIES AB Structural and optical properties of strained (In,Ga)As/GaAs heterostructures grown on (110) GaAs substrates intentionally misoriented by 6-degrees toward the (111)B surface have been investigated. Photoluminescence and double-crystal x-ray diffraction data show that high-quality (In,Ga)As/GaAs quantum wells can be grown on the (110) vicinal surface. C1 USN,RES LAB,WASHINGTON,DC 20375. RP SUN, DC (reprint author), UNIV VIRGINIA,DEPT ELECT ENGN,CHARLOTTESVILLE,VA 22903, USA. RI Bennett, Brian/A-8850-2008 OI Bennett, Brian/0000-0002-2437-4213 NR 16 TC 1 Z9 1 U1 1 U2 1 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 1071-1023 J9 J VAC SCI TECHNOL B JI J. Vac. Sci. Technol. B PD MAR-APR PY 1994 VL 12 IS 2 BP 1095 EP 1098 DI 10.1116/1.587096 PG 4 WC Engineering, Electrical & Electronic; Nanoscience & Nanotechnology; Physics, Applied SC Engineering; Science & Technology - Other Topics; Physics GA NG711 UT WOS:A1994NG71100117 ER PT J AU TOWE, E SUN, D BENNETT, BR AF TOWE, E SUN, D BENNETT, BR TI GROWTH OF THE (IN,AL,GA)AS QUATERNARY ALLOY SYSTEM ON GAAS AT LOW SUBSTRATE TEMPERATURES BY MOLECULAR-BEAM EPITAXY SO JOURNAL OF VACUUM SCIENCE & TECHNOLOGY B LA English DT Article; Proceedings Paper CT 13th North American Conference on Molecular-Beam Epitaxy CY SEP 13-15, 1993 CL STANFORD UNIV, STANFORD, CA SP AMER VACUUM SOC HO STANFORD UNIV AB The III-V quaternary alloy system of (In,Al,Ga)As has been successfully grown on (100) GaAs substrates at low substrate temperatures. Visible photoluminescence emission spanning the wavelengths from 630 to 700 nm has been observed from material grown at substrate temperatures ranging from 300 to 500-degrees-C. It is found that the emission intensity is influenced by the substrate temperature. Results are presented for the In0.10Al0.41Ga0.49As quaternary alloy. C1 USN,RES LAB,WASHINGTON,DC 20375. RP TOWE, E (reprint author), UNIV VIRGINIA,DEPT ELECT ENGN,CHARLOTTESVILLE,VA 22903, USA. RI Bennett, Brian/A-8850-2008 OI Bennett, Brian/0000-0002-2437-4213 NR 14 TC 4 Z9 4 U1 0 U2 1 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 1071-1023 J9 J VAC SCI TECHNOL B JI J. Vac. Sci. Technol. B PD MAR-APR PY 1994 VL 12 IS 2 BP 1099 EP 1101 DI 10.1116/1.587097 PG 3 WC Engineering, Electrical & Electronic; Nanoscience & Nanotechnology; Physics, Applied SC Engineering; Science & Technology - Other Topics; Physics GA NG711 UT WOS:A1994NG71100118 ER PT J AU YOUNGDALE, ER MEYER, JR HOFFMAN, CA BARTOLI, FJ MILES, RH CHOW, DH AF YOUNGDALE, ER MEYER, JR HOFFMAN, CA BARTOLI, FJ MILES, RH CHOW, DH TI RECOMBINATION LIFETIME IN INAS-GA1-XINXSB SUPERLATTICES SO JOURNAL OF VACUUM SCIENCE & TECHNOLOGY B LA English DT Article; Proceedings Paper CT 13th North American Conference on Molecular-Beam Epitaxy CY SEP 13-15, 1993 CL STANFORD UNIV, STANFORD, CA SP AMER VACUUM SOC HO STANFORD UNIV AB We report an experimental investigation of Shockley-Read and Auger lifetimes in InAs-Ga1-xInxSb and InAs-GaSb superlattices, based on measurements of the photoconductive response to excitation by a frequency-doubled CO2 laser (4.63 mum) at intensities up to 100 kW/cm2. Results at 77 K for low excitation levels yield Shockley-Read lifetimes between 0.13 and 6 ns. The scaling of the lifetime with carrier concentration also provides the first determinations of Auger coefficients in narrow-gap type II superlattices: gamma3 almost-equal-to 8 X 10(-25) cm6/s at 300 K and gamma3 almost-equal-to 1.3 x 10(-27) cm6/s at 77 K. The observed Auger lifetime at 77 K is two orders of magnitude longer than that in Hg1-xCdxTe with the same energy gap, which has highly favorable implications for InAs-Ga1-xInxSb superlattices in both IR detector and nonlinear optical applications. C1 HUGHES RES LABS,MALIBU,CA 90265. RP YOUNGDALE, ER (reprint author), USN,RES LAB,CODE 5613,WASHINGTON,DC 20375, USA. NR 15 TC 11 Z9 11 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 1994 VL 12 IS 2 BP 1129 EP 1132 DI 10.1116/1.587064 PG 4 WC Engineering, Electrical & Electronic; Nanoscience & Nanotechnology; Physics, Applied SC Engineering; Science & Technology - Other Topics; Physics GA NG711 UT WOS:A1994NG71100127 ER PT J AU DIVENERE, A YI, XJ HOU, CL WANG, HC CHEN, J KETTERSON, JB WONG, GK MEYER, JR HOFFMAN, CA BARTOLI, FJ AF DIVENERE, A YI, XJ HOU, CL WANG, HC CHEN, J KETTERSON, JB WONG, GK MEYER, JR HOFFMAN, CA BARTOLI, FJ TI MOLECULAR-BEAM EPITAXY GROWTH OF BI EPILAYERS AND BI-CDTE SUPERLATTICES SO JOURNAL OF VACUUM SCIENCE & TECHNOLOGY B LA English DT Article; Proceedings Paper CT 13th North American Conference on Molecular-Beam Epitaxy CY SEP 13-15, 1993 CL STANFORD UNIV, STANFORD, CA SP AMER VACUUM SOC HO STANFORD UNIV ID NONLINEAR OPTICAL COEFFICIENTS; PBTE-BI; TRANSPORT-PROPERTIES; PHASE CONJUGATION; MU-M; SEMICONDUCTORS; GAP; BISMUTH; HGCDTE; FILMS AB The successful growth of Bi epilayers, and for the first time Bi-CdTe superlattices, by molecular-beam epitaxy (MBE) on CdTe (111)B substrates is reported. X-ray diffraction shows several orders of satellites indicative of the abruptness of the interfaces. Initial analysis by high-resolution transmission electron microscopy shows sharp interfaces, although stacking faults are evident in the growth of CdTe on Bi. The growth of Bi layers exhibits streaked reflection high-energy electron diffraction patterns with clear Kikuchi lines. This is the first direct evidence for the layer by layer growth of Bi on CdTe by MBE. A detailed characterization of the electron and hole densities and mobilities in epilayers with a range of thicknesses has been obtained from a hybrid mixed conduction analysis of the magneto-transport data. Temperature dependences of the minority electron concentrations at greater-than-or-equal-to 150 K have yielded the first convincing evidence for a semimetal to semiconductor transition in Bi thin films, at a thickness between 200 and 300 angstrom. C1 USN,RES LAB,WASHINGTON,DC 20375. RP DIVENERE, A (reprint author), NORTHWESTERN UNIV,DEPT PHYS & ASTRON,EVANSTON,IL 60208, USA. RI Ketterson, John/B-7234-2009 NR 30 TC 9 Z9 9 U1 0 U2 5 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 1994 VL 12 IS 2 BP 1136 EP 1139 DI 10.1116/1.587066 PG 4 WC Engineering, Electrical & Electronic; Nanoscience & Nanotechnology; Physics, Applied SC Engineering; Science & Technology - Other Topics; Physics GA NG711 UT WOS:A1994NG71100129 ER PT J AU SAVAGE, P FRENCK, R PADERANGA, D EMPEROR, J SHANNON, KM AF SAVAGE, P FRENCK, R PADERANGA, D EMPEROR, J SHANNON, KM TI PARENTAL ORIGINS OF CHROMOSOME-7 LOSS IN CHILDHOOD MONOSOMY-7 SYNDROME SO LEUKEMIA LA English DT Article ID PLASMINOGEN-ACTIVATOR INHIBITOR; BONE-MARROW MONOSOMY-7; ACUTE MYELOID-LEUKEMIA; MYELODYSPLASTIC SYNDROMES; CYSTIC-FIBROSIS; LONG ARM; GENE; CHILDREN; NEUROFIBROMATOSIS; POLYMORPHISM AB Bone marrow monosomy 7 (Mo 7) is associated with childhood preleukemic myeloproliferative and myelodysplastic syndromes (MPS and MDS). We used a series of polymorphic markers to investigate the parental origins of chromsomes lost from the bone marrows of 12 children with MPS/MDS and Mo 7. Eight Mo 7 bone marrows lost a maternal chromosome 7 and four cases lost the paternal homologue. Our data and the results of previous laboratory and clinical observations in the familial and sporadic forms of childhood Mo 7 suggest that chromosome 7 deletions contribute to leukemogenesis by gene dosage. C1 UNIV CALIF SAN FRANCISCO,DEPT PEDIAT,SAN FRANCISCO,CA 94143. USN HOSP,DEPT INTERNAL MED,OAKLAND,CA. USN HOSP,DEPT PEDIAT,OAKLAND,CA. USN HOSP,DEPT CLIN INVEST,OAKLAND,CA. NR 36 TC 25 Z9 25 U1 0 U2 0 PU STOCKTON PRESS PI BASINGSTOKE PA HOUNDMILLS, BASINGSTOKE, HAMPSHIRE, ENGLAND RG21 6XS SN 0887-6924 J9 LEUKEMIA JI Leukemia PD MAR PY 1994 VL 8 IS 3 BP 485 EP 489 PG 5 WC Oncology; Hematology SC Oncology; Hematology GA NF195 UT WOS:A1994NF19500019 PM 8127152 ER PT J AU NEWTON, JA WEISS, PJ AF NEWTON, JA WEISS, PJ TI ASPIRATION PNEUMONIA CAUSED BY MYCOBACTERIUM-SMEGMATIS SO MAYO CLINIC PROCEEDINGS LA English DT Letter C1 USN,MED CTR,DIV INFECT DIS,SAN DIEGO,CA. RP NEWTON, JA (reprint author), USN,MED CTR,DIV INFECT DIS,PORTSMOUTH,VA, USA. NR 4 TC 7 Z9 7 U1 0 U2 0 PU MAYO CLINIC PROCEEDINGS PI ROCHESTER PA 660 SIEBENS BLDG MAYO CLINIC, ROCHESTER, MN 55905 SN 0025-6196 J9 MAYO CLIN PROC JI Mayo Clin. Proc. PD MAR PY 1994 VL 69 IS 3 BP 296 EP 296 PG 1 WC Medicine, General & Internal SC General & Internal Medicine GA MZ902 UT WOS:A1994MZ90200018 PM 8133672 ER PT J AU HOLT, WH MOCK, W ZERILLI, FJ CLARK, JB AF HOLT, WH MOCK, W ZERILLI, FJ CLARK, JB TI EXPERIMENTAL AND COMPUTATIONAL STUDY OF THE IMPACT DEFORMATION OF TITANIUM TAYLOR CYLINDER SPECIMENS SO MECHANICS OF MATERIALS LA English DT Article; Proceedings Paper CT Symposium on Shear Instabilities and Viscoplasticity Theories, as Part of the Annual Conference of the Society-of-Engineering-Science CY SEP 14-16, 1992 CL UNIV CALIF SAN DIEGO, SAN DIEGO, CA SP SOC ENGN SCI HO UNIV CALIF SAN DIEGO ID CONSTITUTIVE RELATIONS; MECHANICS AB Gas-gun reverse-ballistic Taylor cylinder impact deformation experiments have been performed with specimens of 99.7% titanium. The flat-ended, 6.35 mm diameter, 25.4 mm long solid cylindrical specimens were impacted by sabot-mounted 34.0 mm diameter, 19.0 mm thKck disks of maraging 350 steel. Experiments were performed at 225 and 294 m/s; a soft recovery system prevented post-impact damage to the specimens. Plastic deformation extended over approximately 57 and 64% of the deformed specimen length, respectively, with little lateral spreading. The specimen shapes were digitized via a toolmaker's microscope connected to a computer. Metallographic examination of longitudinal sections through the specimens revealed extensive deformation twinniXg with twinned grains appearing through the deformed regions. Distributions of twins as a function of distance from the impact end were determined for each specimen. The importance of twinning in the computational modelling of deformation in body centered cubic (BCC) iron was shown by Zerilli and Armstrong. It is also very important for hexagonal close packed (HCP) titanium which exhibits a BCC type of behavior. Deformation twinning can cause a reduction in the effective size of the twinned grains; an associated increase in the yield stress could explain the relatively small amount of lateral spreading observed for the titanium Taylor specimens. Computational simulations of the impact experiments performed without provision for twinning show significant differences between the simulations and the experimental shapes. When twinning effects are included, good fits to the experimental shapes are obtained. C1 USN,CTR SURFACE WARFARE,SILVER SPRING,MD 20910. RP HOLT, WH (reprint author), USN,CTR SURFACE WARFARE,DAHLGREN DIV,MAIL CODE G22,DAHLGREN,VA 22448, USA. NR 16 TC 15 Z9 16 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0167-6636 J9 MECH MATER JI Mech. Mater. PD MAR PY 1994 VL 17 IS 2-3 BP 195 EP 201 DI 10.1016/0167-6636(94)90059-0 PG 7 WC Materials Science, Multidisciplinary; Mechanics SC Materials Science; Mechanics GA NE256 UT WOS:A1994NE25600011 ER PT J AU ARMSTRONG, RW ZERILLI, FJ AF ARMSTRONG, RW ZERILLI, FJ TI DISLOCATION MECHANICS ASPECTS OF PLASTIC INSTABILITY AND SHEAR BANDING SO MECHANICS OF MATERIALS LA English DT Article ID CONSTITUTIVE RELATIONS; FLOW-STRESS; DEPENDENCE; BEHAVIOR; IMPACT AB A dislocation mechanics based constitutive equation explanation is given for the observation that face-centered-cubic (fcc) metals are less shear band prone than body-centered-cubic (bcc) ones. Factors relating to plastic flow mechanisms within the polycrystal grains of a material as well as at the boundaries between the grains are important: (1) In the fcc case, dislocation ''forest'' intersections that accumulate with increased straining produce a thermally-activated component of the polycrystal flow stress. As a consequence, the dislocation forest build-up gives a positive strain rate dependence of strain hardening that leads to more stable plastic flow. (2) In bcc metals and alloys, more so than fcc ones, dislocation pile-up stress concentrations occur at the polycrystal grain boundaries to produce a strong (Hall-Petch) grain size dependence of the plastic flow stress. The localized heating at such pile-up breakthroughs provides a fundamental mechanism for the promotion of shear banding. C1 USN, CTR SURFACE WARFARE, DEPT RES & TECHNOL, SILVER SPRING, MD 20910 USA. RP ARMSTRONG, RW (reprint author), UNIV MARYLAND, DEPT MECH ENGN, COLLEGE PK, MD 20742 USA. NR 44 TC 33 Z9 34 U1 2 U2 14 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0167-6636 EI 1872-7743 J9 MECH MATER JI Mech. Mater. PD MAR PY 1994 VL 17 IS 2-3 BP 319 EP 327 DI 10.1016/0167-6636(94)90069-8 PG 9 WC Materials Science, Multidisciplinary; Mechanics SC Materials Science; Mechanics GA NE256 UT WOS:A1994NE25600021 ER PT J AU THOMAS, JR SHURTLEFF, D SCHROT, J AHLERS, ST AF THOMAS, JR SHURTLEFF, D SCHROT, J AHLERS, ST TI COLD-INDUCED PERTURBATION OF CUTANEOUS BLOOD-FLOW IN THE RAT TAIL - A MODEL OF NONFREEZING COLD INJURY SO MICROVASCULAR RESEARCH LA English DT Article AB Cold-induced alteration of cutaneous blood flow, measured with laser-Doppler flowmetry, was studied in a rat tail model of nonfreezing cold injury (NFCI). The NFCI-inducing condition consisted of prolonged tail immersion in 1 degrees water. Before exposure to the injury condition, tail blood flow (laser Doppler flux) during brief 3 degrees immersion showed cold-induced cycles of vasoconstriction followed by cold-induced vasodilation (CIVD). Tail temperature exhibited cyclic patterns similar to blood flow in response to cold water immersion. Cold exposures to 1 degrees for 1 or 3 hr induced no systematic change; however, cold exposures of 6 or 9 hr induced profound and long-lasting blood flow and temperature deviations. Following the cold injury condition, CIVD was completely absent and remained absent for several weeks, suggesting that CIVD loss is an important component in development of NFCI. Cold-induced disturbances of cutaneous blood how in the rat tail consisted of a sequence of distinctive stages analogous to those described in human NFCI. These stages were evidenced initially by several days of reduced blood flow and thermal sensitivity, followed in a week by a hyperemia stage, and later by enhanced vascular and thermal sensitivity. The cutaneous blood flow alterations and sequence of variations following prolonged cold exposure suggest that the rat tail may be a valid model of human NFCI. (C) 1994 Academic Press, Inc. RP THOMAS, JR (reprint author), USN,MED RES INST,THERMAL STRESS PROGRAM,BETHESDA,MD 20889, USA. NR 30 TC 7 Z9 8 U1 0 U2 1 PU ACADEMIC PRESS INC JNL-COMP SUBSCRIPTIONS PI SAN DIEGO PA 525 B ST, STE 1900, SAN DIEGO, CA 92101-4495 SN 0026-2862 J9 MICROVASC RES JI Microvasc. Res. PD MAR PY 1994 VL 47 IS 2 BP 166 EP 176 DI 10.1006/mvre.1994.1013 PG 11 WC Peripheral Vascular Disease SC Cardiovascular System & Cardiology GA NB271 UT WOS:A1994NB27100002 PM 8022317 ER PT J AU EATON, JH AF EATON, JH TI CREATING CONFUSION - THE 10TH-CIRCUITS ROCKY-MOUNTAIN ARSENAL DECISION SO MILITARY LAW REVIEW LA English DT Review RP EATON, JH (reprint author), USN RESERVE,CTR READINESS,JUDGE ADVOCATE GEN CROPS,PORTLAND,OR, USA. NR 22 TC 2 Z9 2 U1 0 U2 1 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 1994 VL 144 BP 126 EP 147 PG 22 WC Law SC Government & Law GA QF335 UT WOS:A1994QF33500004 ER PT J AU VARGA, JH AF VARGA, JH TI RADIAL KERATOTOMY SO MILITARY MEDICINE LA English DT Letter RP VARGA, JH (reprint author), USN HOSP,DEPT OPHTHALMOL,CHARLESTON,SC, USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU ASSN MILITARY SURG US PI BETHESDA PA 9320 OLD GEORGETOWN RD, BETHESDA, MD 20814 SN 0026-4075 J9 MIL MED JI Milit. Med. PD MAR PY 1994 VL 159 IS 3 BP A5 EP A5 PG 1 WC Medicine, General & Internal SC General & Internal Medicine GA NJ938 UT WOS:A1994NJ93800001 PM 8041455 ER PT J AU KISER, WR OOSTERMAN, S AF KISER, WR OOSTERMAN, S TI RAPID IMMUNOINHIBITION ASSAY FOR CK-MB SO MILITARY MEDICINE LA English DT Letter RP KISER, WR (reprint author), USN HOSP,DEPT FAMILY PRACTICE,ORLANDO,FL, USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU ASSN MILITARY SURG US PI BETHESDA PA 9320 OLD GEORGETOWN RD, BETHESDA, MD 20814 SN 0026-4075 J9 MIL MED JI Milit. Med. PD MAR PY 1994 VL 159 IS 3 BP L6 EP L7 PG 2 WC Medicine, General & Internal SC General & Internal Medicine GA NJ938 UT WOS:A1994NJ93800004 ER PT J AU WIRTZ, JJ AF WIRTZ, JJ TI THE DE-ESCALATION OF NUCLEAR CRISES - NATION,JE SO MILLENNIUM-JOURNAL OF INTERNATIONAL STUDIES LA English DT Book Review RP WIRTZ, JJ (reprint author), USN,POSTGRAD SCH,MONTEREY,CA 93940, USA. NR 1 TC 0 Z9 0 U1 0 U2 0 PU MILLENNIUM-J INT STUD PI LONDON PA LONDON SCHOOL ECONOMICS HOUGHTON ST, LONDON, ENGLAND WC2A 2AE SN 0305-8298 J9 MILLENNIUM-J INT ST JI Millennium-J. Int. Stud. PD SPR PY 1994 VL 23 IS 1 BP 173 EP 175 PG 3 WC International Relations SC International Relations GA NN564 UT WOS:A1994NN56400031 ER PT J AU ROBERTS, MJ AF ROBERTS, MJ TI THE POLITICS OF UNITED-STATES-FOREIGN-POLICY - ROSATI,JA SO MILLENNIUM-JOURNAL OF INTERNATIONAL STUDIES LA English DT Book Review RP ROBERTS, MJ (reprint author), USN,POSTGRAD SCH,MONTEREY,CA 93940, USA. NR 1 TC 0 Z9 0 U1 0 U2 1 PU MILLENNIUM-J INT STUD PI LONDON PA LONDON SCHOOL ECONOMICS HOUGHTON ST, LONDON, ENGLAND WC2A 2AE SN 0305-8298 J9 MILLENNIUM-J INT ST JI Millennium-J. Int. Stud. PD SPR PY 1994 VL 23 IS 1 BP 181 EP 183 PG 3 WC International Relations SC International Relations GA NN564 UT WOS:A1994NN56400036 ER PT J AU DECREDICO, MA AF DECREDICO, MA TI BLACK LEGACY - AMERICA HIDDEN HERITAGE - PIERSEN,WD SO MISSISSIPPI QUARTERLY LA English DT Book Review RP DECREDICO, MA (reprint author), USN ACAD,ANNAPOLIS,MD 21402, USA. NR 1 TC 0 Z9 0 U1 0 U2 0 PU MISSISSIPPI QUARTERLY PI MISSISSIPPI STATE PA PO BOX 5272, MISSISSIPPI STATE, MS 39762 SN 0026-637X J9 MISS QUART JI Mississippi Q. PD SPR PY 1994 VL 47 IS 2 BP 357 EP 359 PG 3 WC Literary Theory & Criticism SC Literature GA PF229 UT WOS:A1994PF22900030 ER PT J AU NANOS, GP AF NANOS, GP TI PRESIDENT PAGE SO NAVAL ENGINEERS JOURNAL LA English DT Editorial Material RP NANOS, GP (reprint author), USN,WASHINGTON,DC 20350, USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER SOC NAVAL ENG INC PI ALEXANDRIA PA 1452 DUKE STREET, ALEXANDRIA, VA 22314-3458 SN 0028-1425 J9 NAV ENG J JI Nav. Eng. J. PD MAR PY 1994 VL 106 IS 2 BP 6 EP 6 PG 1 WC Engineering, Marine; Engineering, Civil; Oceanography SC Engineering; Oceanography GA NC423 UT WOS:A1994NC42300001 ER PT J AU ROBINSON, SD MATLOCK, RS AF ROBINSON, SD MATLOCK, RS TI LEAP TECHNOLOGY UPGRADES TO TACTICAL MISSILES PROVIDE NEAR-TERM OPTIONS FOR THEATER MISSILE DEFENSE SO NAVAL ENGINEERS JOURNAL LA English DT Article AB Over the past several years, BMDO's Lightweight Exoatmospheric Projectile (LEAP) program has achieved dramatic success in the development of advanced kinetic energy kill vehicle (KKV) technologies. Proof of principle ground and flight testing of these miniaturized interceptor technologies has been ongoing since 1989 with encouraging results. Recent testing successes have provided an excellent opportunity to investigate the incorporation of LEAP technologies into existing tactical missile systems for applications in Theater Ballistic Missile Defense (TBMD). Current tests and planning activities are building on lessons learned from previous LEAP tests to retrofit Navy, Air Force, and possibly Army missile systems with LEAP interceptors and kickstages in the interest of performing early technology demonstrations. These low-cost, integrated technology flight tests will take advantage of available missile systems, existing test activities, and established service infrastructures to evaluate LEAP technologies in a realistic tactical environment. They will also help determine the feasibility of performing long-range ballistic missile defense with KKVs from tactical platforms before commitment to the acquisition of new major weapon systems. Successful LEAP technology demonstrations could provide valuable contingency options for limited theater or national missile defense in the near term, prior to the fielding of proposed advanced systems. RP ROBINSON, SD (reprint author), USN,ANSER,WASHINGTON,DC 20350, USA. NR 0 TC 0 Z9 0 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 MAR PY 1994 VL 106 IS 2 BP 93 EP 109 PG 17 WC Engineering, Marine; Engineering, Civil; Oceanography SC Engineering; Oceanography GA NC423 UT WOS:A1994NC42300007 ER PT J AU MCLEAN, M HILL, J COBB, R RANDALL, F AF MCLEAN, M HILL, J COBB, R RANDALL, F TI MODAL TEST OF JONES,JOHN,PAUL (DDG-53) MAST AND MAST-MOUNTED ANTENNAS SO NAVAL ENGINEERS JOURNAL LA English DT Article AB A modal test of the John Paul Jones (DDG-53) mainmast structure and mast-mounted antennas was conducted. The test was part of a larger effort to accurately determine dynamic characteristics of the ''as-built'' mast/antenna system and survivability in the vibration and underwater explosion (UNDEX) shock environment. Previous mathematical analysis of the DDG-51 class mast and antennas predicted response acceleration levels during a shock trials scenario to be excessive in some areas. The modal test results now provide, however, confirmed dynamic response characteristics including mode shapes, frequencies, and damping for the structure. The test data accounts for the flexibility of ship's structure including the deckhouse supporting the mast. In addition, the natural frequencies of the antennas were determined for the response range of the mast structure with the flexibility of the supporting foundations taken into account. Using the test results, a finite element model of the mast structure and antennas was built accurately representing the dynamic characteristics of the system. Dynamic transient shock analysis was conducted to provide response predictions of the mast and antennas using the validated model. Any potential response amplification conditions that might result in failure during shock trials were identified. RP MCLEAN, M (reprint author), USN,SEA SYST COMMAND,WASHINGTON,DC 20350, 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 MAR PY 1994 VL 106 IS 2 BP 110 EP 117 PG 8 WC Engineering, Marine; Engineering, Civil; Oceanography SC Engineering; Oceanography GA NC423 UT WOS:A1994NC42300008 ER PT J AU SINGH, A MARKOWITZ, MA AF SINGH, A MARKOWITZ, MA TI THE STABILIZATION OF TUBULES FORMED FROM HETEROBIFUNCTIONAL PHOSPHOLIPIDS SO NEW JOURNAL OF CHEMISTRY LA English DT Article ID LIPID BILAYERS; GENERAL-METHOD; PHOSPHATIDYLCHOLINES; MICROSTRUCTURES; MONOLAYERS; LIPOSOMES AB The formation properties of hollow, cylindrical microstructures or tubules (0.4-0.5 mum diameter and length up to 300 mum) and their stabilization from phospholipids equipped with heterobifunctional groups are reported. Two phospholipids, 1,2-bis(tricosa-10,12-diyn-22-enoyl)-sn-glycero-3-phosphocholine (1) and 1,2-bis(tetracosa-10,12-diyn-24-methacryloyl)-sn-glycero-3-phosphocholine (2), were synthesized. These lipids contain an olefinic or methacryloyl group at the acyl chain terminus in addition to diacetylenic group to provide additional polymerization in lipid bilayers. Tubule formation was observed from 1 and 2 and from mixtures of 1 with 1,2-bis(tricosa-10,12-diynoyl)-sn-glycero-3-phosphocholine (3). Differential scanning calorimetry and Langmuir film studies demonstrated that phospholipids 1 and 3 were miscible. Polymerization of tubules from 1 and 2 by UV and gamma radiation (Co-60) was characterized by thin layer chromatography, FT-IR, and NMR. Polymerization by gamma radiation disrupted the morphology of tubules formed from 1. The effect of polymerization on tubules formed from 2 was dependent on temperature. Tubule formation properties and the effect of polymerization on the resultant morphology of tubules formed from mixtures of 1 and 3 depended on the lipid ratio in the mixtures. At 1:2 and 1:1 molar ratios of 1 to 3, complete conversion of lipid into 20-30 mum and 30-40 mum tubules was observed by optical and transmission electron microscopy. Tubules polymerized by a combination of UV and gamma radiation retained the tubule morphology and were stable to ultrasonic agitation, and lyophilization followed by redispersion. At 3:1 molar ratio of 1 to 3, 15-20 mum long tubules were observed. The lipids were only partially polymerized by UV and gamma radiation and some disruption of tubule morphology was observed. RP SINGH, A (reprint author), USN,RES LAB,CTR BIOMOLEC SCI & ENGN,CODE 6900,WASHINGTON,DC 20375, USA. NR 26 TC 11 Z9 11 U1 0 U2 0 PU GAUTHIER-VILLARS PI PARIS PA S P E S-JOURNAL DEPT, 120 BD ST GERMAIN, F-75006 PARIS, FRANCE SN 1144-0546 J9 NEW J CHEM JI New J. Chem. PD MAR PY 1994 VL 18 IS 3 BP 377 EP 385 PG 9 WC Chemistry, Multidisciplinary SC Chemistry GA NH129 UT WOS:A1994NH12900010 ER PT J AU BENNETT, HE RATHER, JDG MONTGOMERY, EE AF BENNETT, HE RATHER, JDG MONTGOMERY, EE TI FREE-ELECTRON LASER POWER BEAMING TO SATELLITES AT CHINA LAKE, CALIFORNIA SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article; Proceedings Paper CT 15th International Free Electron Laser Conference CY AUG 23-27, 1993 CL NETHERLANDS CONGRESS CTR, HAGUE, NETHERLANDS SP UNIV TWENTE, DEPT APPL PHYS, FOM INST PLASMA PHYS RIJNHUIZEN HO NETHERLANDS CONGRESS CTR AB Laser power beaming of energy through the atmosphere to a satellite can extend its lifetime by keeping the satellite batteries in operating condition longer. An alternate propulsion system utilizing power beaming will also significantly reduce the initial insertion cost of these satellites, which now range up to $160000/kg, for geosynchronous orbit. Elements of the power beaming system are a high power free-electron laser, a large diameter telescope to reduce diffractive losses, an adaptive optic beam conditioning system and possibly a balloon or aerostat carrying a large mirror to redirect the laser beam to the satellite after traversing the earth's atmosphere. China Lake, California has excellent seeing, averages 260 cloud-free days/year, has a large geothermal plant nearby for inexpensive power, the lake for water, and is thus an ideal site for such a laser power beaming system. Technological challenges in building such a system and installing it at China Lake will be discussed. C1 NASA,MARSHAL SPACE FLIGHT CTR,MONTGOMERY,AL 35812. NASA,WASHINGTON,DC 20546. RP BENNETT, HE (reprint author), USN,AIR WARFARE CTR,WEAPONS DIV,CHINA LAKE,CA 93555, 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 0168-9002 J9 NUCL INSTRUM METH A JI Nucl. Instrum. Methods Phys. Res. Sect. A-Accel. Spectrom. Dect. Assoc. Equip. PD MAR 1 PY 1994 VL 341 IS 1-3 BP 124 EP 131 DI 10.1016/0168-9002(94)90332-8 PG 8 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA NA788 UT WOS:A1994NA78800029 ER PT J AU FREUND, HP JACKSON, RH AF FREUND, HP JACKSON, RH TI WIGGLER IMPERFECTIONS IN FREE-ELECTRON LASERS SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article; Proceedings Paper CT 15th International Free Electron Laser Conference CY AUG 23-27, 1993 CL NETHERLANDS CONGRESS CTR, HAGUE, NETHERLANDS SP UNIV TWENTE, DEPT APPL PHYS, FOM INST PLASMA PHYS RIJNHUIZEN HO NETHERLANDS CONGRESS CTR ID FIELD ERRORS; RADIATION AB A self-consistent 3-D analysis of wiggler imperfections in FELs is described using the WIGGLIN simulation code. WIGGLIN treats the electron dynamics using the 3-D Lorentz force equations, and does not rely on a wiggler-averaged formalism. In the planar wiggler model used, both the divergence and the axial component of the curl vanish identically while the transverse components of the curl are small. In describing wiggler imperfections, a random variation is chosen for the pole-to-pole variations in the amplitude and a continuous map is used between the pole faces. The average efficiency, as well as the standard deviation about the average efficiency, is determined by using an ensemble of different randomly chosen wiggler variations with a fixed rms value. The specific parameters chosen correspond to the 35-GHz ELF experiment conducted at Lawrence Livermore National Laboratory; however, the fundamental physics is relevant to a wide range of FEL experiments. On average, increases in the field imperfections cause a decrease in the efficiency; however, this is relatively benign and is certainly a much less severe constraint than that imposed by electron beam quality considerations. In addition, particular error distributions can result in efficiency enhancements. C1 SCI APPLICAT INT CORP,MCLEAN,VA 22102. RP FREUND, HP (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 14 TC 3 Z9 3 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-9002 J9 NUCL INSTRUM METH A JI Nucl. Instrum. Methods Phys. Res. Sect. A-Accel. Spectrom. Dect. Assoc. Equip. PD MAR 1 PY 1994 VL 341 IS 1-3 BP 225 EP 229 DI 10.1016/0168-9002(94)90353-0 PG 5 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA NA788 UT WOS:A1994NA78800050 ER PT J AU FREUND, HP JACKSON, RH PERSHING, DE AF FREUND, HP JACKSON, RH PERSHING, DE TI THE NONLINEAR-ANALYSIS OF SELF-FIELD EFFECTS IN FREE-ELECTRON LASERS SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article; Proceedings Paper CT 15th International Free Electron Laser Conference CY AUG 23-27, 1993 CL NETHERLANDS CONGRESS CTR, HAGUE, NETHERLANDS SP UNIV TWENTE, DEPT APPL PHYS, FOM INST PLASMA PHYS RIJNHUIZEN HO NETHERLANDS CONGRESS CTR ID GUIDE MAGNETIC-FIELD; AMPLIFIER; SIMULATION AB A model of the DC self-fields associated with the electron beam is incorporated into 3-dimensional nonlinear formulations of free-electron lasers. The nonlinear formulations are based upon the ARACHNE and WIGGLIN codes which are slow-time-scale formulations for the evolution of the amplitudes and phases of a multi-mode superposition of vacuum waveguide modes. The electron dynamics in these codes are treated by means of the complete 3-dimensional Lorentz force equations, and the representations for the self-fields are incorporated directly into this formulation. Results of the simulations are compared with experiments at LLNL using a planar wiggler, and at MIT and NRL which used helical wigglers. These experiments exhibited comparable space-charge depressions of DELTAgamma(self)/gamma(0) almost-equal-to 0.53-0.78% across the beam. The simulations are in reasonable agreement with the experiments. C1 SCI APPLICAT INT CORP,MCLEAN,VA 22102. MISSION RES CORP,NEWINGTON,VA 22122. RP FREUND, HP (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 14 TC 1 Z9 1 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-9002 J9 NUCL INSTRUM METH A JI Nucl. Instrum. Methods Phys. Res. Sect. A-Accel. Spectrom. Dect. Assoc. Equip. PD MAR 1 PY 1994 VL 341 IS 1-3 BP 259 EP 264 DI 10.1016/0168-9002(94)90360-3 PG 6 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA NA788 UT WOS:A1994NA78800057 ER PT J AU HAFIZI, B SPRANGLE, P FISHER, A AF HAFIZI, B SPRANGLE, P FISHER, A TI A FAR-INFRARED GRATING FREE-ELECTRON LASER SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article; Proceedings Paper CT 15th International Free Electron Laser Conference CY AUG 23-27, 1993 CL NETHERLANDS CONGRESS CTR, HAGUE, NETHERLANDS SP UNIV TWENTE, DEPT APPL PHYS, FOM INST PLASMA PHYS RIJNHUIZEN HO NETHERLANDS CONGRESS CTR ID GENERATION; RADIATION AB Design parameters for a compact radiation source operating in the infrared region of the spectrum are presented. The source is configured as a free-electron laser oscillator, utilizing an annular electron beam and a coaxial waveguide with a corrugated central conductor. A compact source that is tunable in the wavelength band 35-55 mum with output in the kilowatt range is shown to be feasible. C1 USN,RES LAB,DIV PLASMA PHYS,BEAM PHYS BRANCH,WASHINGTON,DC 20375. RP HAFIZI, B (reprint author), ICARUS RES,7113 EXFAIR RD,BETHESDA,MD 20814, USA. NR 16 TC 1 Z9 1 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-9002 J9 NUCL INSTRUM METH A JI Nucl. Instrum. Methods Phys. Res. Sect. A-Accel. Spectrom. Dect. Assoc. Equip. PD MAR 1 PY 1994 VL 341 IS 1-3 BP 269 EP 273 DI 10.1016/0168-9002(94)90362-X PG 5 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA NA788 UT WOS:A1994NA78800059 ER PT J AU JACKSON, RH FREUND, HP PERSHING, DE TACCETTI, JM AF JACKSON, RH FREUND, HP PERSHING, DE TACCETTI, JM TI THE COAXIAL HYBRID IRON (CHI) WIGGLER SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article; Proceedings Paper CT 15th International Free Electron Laser Conference CY AUG 23-27, 1993 CL NETHERLANDS CONGRESS CTR, HAGUE, NETHERLANDS SP UNIV TWENTE, DEPT APPL PHYS, FOM INST PLASMA PHYS RIJNHUIZEN HO NETHERLANDS CONGRESS CTR ID ELECTRON AB A wiggler design has been developed which is scalable to small periods with high field amplitude, high beam current acceptance, and excellent transverse focusing and beam propagation properties. The coaxial hybrid iron (CHI) wiggler design consists of a coaxial arrangement of alternating ferromagnetic and non-ferromagnetic rings with the central portion of the coax shifted by one half period. The entire arrangement is immersed in a solenoidal field which results in a cylindrically symmetric periodic field. FEL configurations using this wiggler design have the potential for high power, high frequency coherent generation in relatively compact systems. Analytic and simulated characteristics of the CHI wiggler are discussed. C1 UNIV MARYLAND,COLL PK,MD 20742. SCI APPLICAT INT CORP,MCLEAN,VA 22102. MISSION RES CORP,NEWINGTON,VA 22122. RP JACKSON, RH (reprint author), USN,RES LAB,VACUUM ELECTR BRANCH,CODE 6840,WASHINGTON,DC 20375, USA. NR 14 TC 33 Z9 33 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-9002 J9 NUCL INSTRUM METH A JI Nucl. Instrum. Methods Phys. Res. Sect. A-Accel. Spectrom. Dect. Assoc. Equip. PD MAR 1 PY 1994 VL 341 IS 1-3 BP 454 EP 458 DI 10.1016/0168-9002(94)90403-0 PG 5 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA NA788 UT WOS:A1994NA78800100 ER PT J AU BLAU, J WONG, RK QUICK, DD COLSON, WB AF BLAU, J WONG, RK QUICK, DD COLSON, WB TI 3-DIMENSIONAL SIMULATIONS OF THE NOVOSIBIRSK SELENE FEL SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article RP BLAU, J (reprint author), USN,SCH POSTGRAD,DEPT PHYS,MONTEREY,CA 93945, USA. NR 5 TC 3 Z9 3 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-9002 J9 NUCL INSTRUM METH A JI Nucl. Instrum. Methods Phys. Res. Sect. A-Accel. Spectrom. Dect. Assoc. Equip. PD MAR 1 PY 1994 VL 341 IS 1-3 BP ABS94 EP ABS94 PG 1 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA NA788 UT WOS:A1994NA78800160 ER PT J AU COLSON, WB AF COLSON, WB TI AMPLIFICATION OF THE OPTICAL ELECTRIC AND MAGNETIC-FIELDS DESCRIBED BY AMPERE AND FARADAY LAWS SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article RP COLSON, WB (reprint author), USN,SCH POST GRAD,DEPT PHYS,MONTEREY,CA 93943, 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 0168-9002 J9 NUCL INSTRUM METH A JI Nucl. Instrum. Methods Phys. Res. Sect. A-Accel. Spectrom. Dect. Assoc. Equip. PD MAR 1 PY 1994 VL 341 IS 1-3 BP ABS64 EP ABS65 PG 2 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA NA788 UT WOS:A1994NA78800142 ER PT J AU HALL, JB BLAU, J WONG, RK COLSON, WB AF HALL, JB BLAU, J WONG, RK COLSON, WB TI SIMULATIONS OF AN X-RAY FEL UTILIZING THE SLAC LINAC SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article RP HALL, JB (reprint author), USN,SCH POSTGRAD,DEPT PHYS,MONTEREY,CA 93943, 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 0168-9002 J9 NUCL INSTRUM METH A JI Nucl. Instrum. Methods Phys. Res. Sect. A-Accel. Spectrom. Dect. Assoc. Equip. PD MAR 1 PY 1994 VL 341 IS 1-3 BP ABS76 EP ABS77 PG 2 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA NA788 UT WOS:A1994NA78800150 ER PT J AU PINKLEY, WR WILKENSON, W BLAU, J WONG, RK COLSON, WB AF PINKLEY, WR WILKENSON, W BLAU, J WONG, RK COLSON, WB TI RESONANT WAVELENGTH MODULATION IN A FREE-ELECTRON LASER SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article RP PINKLEY, WR (reprint author), USN,SCH POSTGRAD,DEPT PHYS,MONTEREY,CA 93943, USA. NR 3 TC 0 Z9 0 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-9002 J9 NUCL INSTRUM METH A JI Nucl. Instrum. Methods Phys. Res. Sect. A-Accel. Spectrom. Dect. Assoc. Equip. PD MAR 1 PY 1994 VL 341 IS 1-3 BP ABS70 EP ABS70 PG 1 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA NA788 UT WOS:A1994NA78800146 ER PT J AU QUICK, DD BLAU, J WONG, RK COLSON, WB AF QUICK, DD BLAU, J WONG, RK COLSON, WB TI PHASE-SPACE SIMULATIONS OF ELECTRON BUNCHING AND POWER OUTPUT IN THE NOVOSIBIRSK SELENE FEL SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article ID LASER RP QUICK, DD (reprint author), USN,SCH POSTGRAD DEPT PHYS,MONTEREY,CA 93943, USA. NR 4 TC 3 Z9 3 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-9002 J9 NUCL INSTRUM METH A JI Nucl. Instrum. Methods Phys. Res. Sect. A-Accel. Spectrom. Dect. Assoc. Equip. PD MAR 1 PY 1994 VL 341 IS 1-3 BP ABS92 EP ABS93 PG 2 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA NA788 UT WOS:A1994NA78800159 ER PT J AU WONG, RK CLARK, D COLSON, WB AF WONG, RK CLARK, D COLSON, WB TI MULTIPASS TRANSVERSE-MODE EFFECTS IN FREE-ELECTRON LASERS SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article RP WONG, RK (reprint author), USN,SCH POSTGRAD,DEPT PHYS,MONTEREY,CA 93943, USA. NR 2 TC 0 Z9 0 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-9002 J9 NUCL INSTRUM METH A JI Nucl. Instrum. Methods Phys. Res. Sect. A-Accel. Spectrom. Dect. Assoc. Equip. PD MAR 1 PY 1994 VL 341 IS 1-3 BP ABS69 EP ABS69 PG 1 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA NA788 UT WOS:A1994NA78800145 ER PT J AU DENIZ, AV OBENSCHAIN, SP AF DENIZ, AV OBENSCHAIN, SP TI A KRF OSCILLATOR SYSTEM WITH UNIFORM PROFILES SO OPTICS COMMUNICATIONS LA English DT Article ID INDUCED SPATIAL INCOHERENCE; ILLUMINATION UNIFORMITY; TARGETS; PLASMAS; LASERS; SCATTERING; REDUCTION; LIGHT AB A KrF oscillator system that has produced highly uniform flat-top focal distributions is described. The oscillator system is part of a large laser system that will utilize the echelon-free induced spatial incoherence technique to obtain uniform illumination of planar targets for fusion research. With this system, focal profiles with small long scale length nonuniformities have been obtained. The nonuniformity was determined by performing a least-squares fit to a series of profiles, and calculating the deviation of each fit from a flat-top profile. With a linear fit, the deviation averaged over the series is +/- 0.5%, and with a quadratic fit, it is +/- 1.4%. Details of the oscillator system configuration, focal uniformity measurement techniques, and resulting focal profiles are presented. C1 USN,RES LAB,DIV PLASMA PHYS,WASHINGTON,DC 20375. RP DENIZ, AV (reprint author), SCI APPLICAT INT CORP,MCLEAN,VA 22102, USA. NR 20 TC 7 Z9 14 U1 0 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0030-4018 J9 OPT COMMUN JI Opt. Commun. PD MAR 1 PY 1994 VL 106 IS 1-3 BP 113 EP 122 DI 10.1016/0030-4018(94)90066-3 PG 10 WC Optics SC Optics GA MY668 UT WOS:A1994MY66800020 ER PT J AU BASHKANSKY, M ADLER, CL REINTJES, J AF BASHKANSKY, M ADLER, CL REINTJES, J TI COHERENTLY AMPLIFIED RAMAN POLARIZATION GATE FOR IMAGING THROUGH SCATTERING MEDIA SO OPTICS LETTERS LA English DT Article ID ELECTRONIC HOLOGRAPHY; TIME; PULSES AB We demonstrate a new nonlinear optical field cross-correlation technique for two-dimensional imaging through scattering media. The technique, the coherently amplified Raman polarization gate, relies on both the polarization and coherence sensitivity of broadband stimulated Raman amplification to produce a high-contrast gate with temporal resolution of the order of the inverse bandwidth of the pump. RP USN, RES LAB, LASER PHYS BRANCH, CODE 5640, 4555 OVERLOOK AVE SW, WASHINGTON, DC 20375 USA. NR 21 TC 24 Z9 25 U1 0 U2 1 PU OPTICAL SOC AMER PI WASHINGTON PA 2010 MASSACHUSETTS AVE NW, WASHINGTON, DC 20036 USA SN 0146-9592 EI 1539-4794 J9 OPT LETT JI Opt. Lett. PD MAR 1 PY 1994 VL 19 IS 5 BP 350 EP 352 DI 10.1364/OL.19.000350 PG 3 WC Optics SC Optics GA MY674 UT WOS:A1994MY67400014 PM 19829639 ER PT J AU POSTON, WL ROGERS, GW PRIEBE, CE SOLKA, JL AF POSTON, WL ROGERS, GW PRIEBE, CE SOLKA, JL TI A QUALITATIVE-ANALYSIS OF THE RESISTIVE GRID KERNEL ESTIMATOR SO PATTERN RECOGNITION LETTERS LA English DT Article DE PATTERN RECOGNITION; KERNEL ESTIMATION; NONPARAMETRIC PROBABILITY DENSITY ESTIMATION AB The ability to estimate a probability density function from random data has applications in discriminant analysis and pattern recognition problems. A resistive grid kernel estimator (RGKE) is described which is suitable for hardware implementation. The one-dimensional linear RGKE is compared to a kernel estimate using Gaussian kernels, and simulations are presented using both continuous and quantized data. The nonlinear form of the RGKE is shown to have desirable properties, such as the ability to detect discontinuities in the density function. RP POSTON, WL (reprint author), USN,CTR SURFACE WARFARE,DAHLGREN DIV,G33,DAHLGREN,VA 22448, USA. RI Priebe, Carey E./A-3305-2010 NR 6 TC 0 Z9 0 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0167-8655 J9 PATTERN RECOGN LETT JI Pattern Recognit. Lett. PD MAR PY 1994 VL 15 IS 3 BP 219 EP 225 DI 10.1016/0167-8655(94)90053-1 PG 7 WC Computer Science, Artificial Intelligence SC Computer Science GA NA170 UT WOS:A1994NA17000002 ER PT J AU SAWYER, MH HOLLAND, D AINTABLIAN, N CONNOR, JD KEYSER, EF WAECKER, NJ AF SAWYER, MH HOLLAND, D AINTABLIAN, N CONNOR, JD KEYSER, EF WAECKER, NJ TI DIAGNOSIS OF ENTEROVIRAL CENTRAL-NERVOUS-SYSTEM INFECTION BY POLYMERASE CHAIN-REACTION DURING A LARGE COMMUNITY OUTBREAK SO PEDIATRIC INFECTIOUS DISEASE JOURNAL LA English DT Article DE ENTEROVIRUS; POLYMERASE CHAIN REACTION; ENTEROVIRUS MENINGITIS; ASEPTIC MENINGITIS ID AMPLIFICATION; MENINGITIS; IDENTIFICATION; PICORNAVIRUSES; RNA AB Enteroviruses are common causes of localized and systemic infection in patients of all ages and are the most frequent cause of epidemic aseptic meningitis in the United States. We have developed a polymerase chain reaction (PCR) assay of cerebrospinal fluid (CSF) for rapid diagnosis of enteroviral meningitis. This assay was applied to 257 CSF specimens during a large community outbreak of enterovirus disease; 109 (97%) of 112 enterovirus culture-positive CSF samples contained enterovirus RNA. In addition 35 (66%) of 53 samples from patients with suspected central nervous system disease with negative or no CSF viral cultures were positive by enterovirus PCR. The enterovirus PCR detected 13 different enterovirus serotypes. PCR results are available within 24 hours compared with a mean of 6.8 days for enterovirus culture. The clinical characteristics of 141 patients with enterovirus central nervous system disease are presented. This study demonstrates the usefulness of enterovirus PCR for the rapid diagnosis of enterovirus central nervous system disease and the potential for PCR tests to shorten hospitalization. C1 USN,MED CTR,SAN DIEGO,CA 92152. RP SAWYER, MH (reprint author), UNIV CALIF SAN DIEGO,9500 GILMAN DR 0672,LA JOLLA,CA 92093, USA. NR 14 TC 106 Z9 112 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 1994 VL 13 IS 3 BP 177 EP 182 DI 10.1097/00006454-199403000-00002 PG 6 WC Immunology; Infectious Diseases; Pediatrics SC Immunology; Infectious Diseases; Pediatrics GA NA577 UT WOS:A1994NA57700002 PM 8177623 ER PT J AU SCHWARTZ, DK RUIZGARCIA, J QIU, X SELINGER, JV KNOBLER, CM AF SCHWARTZ, DK RUIZGARCIA, J QIU, X SELINGER, JV KNOBLER, CM TI TILT STRIPE TEXTURES IN LANGMUIR MONOLAYERS OF FATTY-ACIDS SO PHYSICA A LA English DT Article ID LIQUID-CRYSTAL FILMS; MODULATED PHASES; TRANSITIONS AB Quantitative studies are described of striped textures in Langmuir monolayers of tetradecanoic and pentadecanoic acids. The textures, which are the result of modulations of the tilt azimuths of the molecules, have been visualized with polarized fluorescence microscopy. The stripe widths change with pressure and temperature. When the monolayer is compressed beyond a threshold pressure, the stripes become unstable and form a zig-zag pattern, which is likely the result of a crossover between the bend and splay elastic constants in the monolayer. C1 USN,RES LAB,CTR BIOMOLEC SCI & ENGN,WASHINGTON,DC 20375. RP SCHWARTZ, DK (reprint author), UNIV CALIF LOS ANGELES,DEPT CHEM & BIOCHEM,LOS ANGELES,CA 90024, USA. RI Selinger, Jonathan/D-1445-2010; Schwartz, Daniel/H-5153-2012 OI Selinger, Jonathan/0000-0002-4982-2457; NR 26 TC 28 Z9 28 U1 2 U2 4 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0378-4371 J9 PHYSICA A JI Physica A PD MAR 1 PY 1994 VL 204 IS 1-4 BP 606 EP 615 DI 10.1016/0378-4371(94)90449-9 PG 10 WC Physics, Multidisciplinary SC Physics GA NB671 UT WOS:A1994NB67100037 ER PT J AU GILLESPIE, DT AF GILLESPIE, DT TI WHY QUANTUM-MECHANICS CANNOT BE FORMULATED AS A MARKOV PROCESS SO PHYSICAL REVIEW A LA English DT Article ID ZENO PARADOX AB Both quantum mechanics and Markov-process theory deal with dynamical systems whose behaviors can be predicted only probabilistically. The question therefore arises as to whether Markov-process theory, a theory that is firmly rooted in the common-sense laws of probability, can provide a generally adequate mathematical framework for quantum mechanics, a theory whose predictions often seem to defy common sense. It is shown here that the measurable behavior of a certain elementary quantum system that oscillates between two discrete states cannot be modeled as a Markov process. That this will also be true for most other quantum systems is shown to follow from the same property of quantum mechanics that is responsible for the so-called quantum Zeno effect. The conclusion that quantum behavior cannot generally be modeled as a Markov process underscores the truly mysterious nature of quantum mechanics when viewed in common-sense terms. RP GILLESPIE, DT (reprint author), USN,CTR AIR WARFARE,RES DEPT,CHINA LAKE,CA 93555, USA. NR 8 TC 20 Z9 20 U1 0 U2 5 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 PY 1994 VL 49 IS 3 BP 1607 EP 1612 DI 10.1103/PhysRevA.49.1607 PG 6 WC Optics; Physics, Atomic, Molecular & Chemical SC Optics; Physics GA NA920 UT WOS:A1994NA92000017 ER PT J AU ABARBANEL, HDI CARROLL, TA PECORA, LM SIDOROWICH, JJ TSIMRING, LS AF ABARBANEL, HDI CARROLL, TA PECORA, LM SIDOROWICH, JJ TSIMRING, LS TI PREDICTING PHYSICAL VARIABLES IN TIME-DELAY EMBEDDING SO PHYSICAL REVIEW E LA English DT Article ID STRANGE ATTRACTORS; SPACE RECONSTRUCTION; SERIES; CHAOS; INFORMATION; DIMENSION AB In time-delay reconstruction of chaotic attractors we can accurately predict the short-term future behavior of the observed variable x(t) = x(n) = x(t0 + tau(s)n) without prior knowledge of the equations of motion by building local or global models in the state space. In many cases we also want to predict variables other than the one which is observed and require methods for determining models to predict these variables in the same space. We present a method which takes measurements of two variables x(n) and z(n) and builds models for the determination of z(n) in the phase-space made out of the x(n) and its time lags. Similarly we show that one may produce models for x(n) in the z(n) space, except where special symmetries prevent this, such as in the familiar Lorenz model. Our algorithm involves building local polynomial models in the reconstructed phase space of the observed variable of low order (linear or quadratic) which approximate the function z(n) = F(x(n)) where x(n) is a vector constructed from a sequence of values of observed variables in a time delay fashion. We train the models on a partial data set of measured values of both x(n) and z(n) and then predict the z(n) in a recovery set of observations of x(n) alone. In all of our analyses we assume that the observed data alone are available to us and that we possess no knowledge of the dynamical equations. We test this method on the numerically generated data set from the Lorenz model and also on a number of experimental data sets from electronic circuits. C1 UNIV CALIF SAN DIEGO,SCRIPPS INST OCEANOG,MARINE PHYS LAB,LA JOLLA,CA 92093. USN,RES LAB,WASHINGTON,DC 20375. UNIV CALIF SAN DIEGO,INST NONLINEAR SCI,LA JOLLA,CA 92093. RP ABARBANEL, HDI (reprint author), UNIV CALIF SAN DIEGO,SCRIPPS INST OCEANOG,DEPT PHYS,LA JOLLA,CA 92093, USA. NR 25 TC 38 Z9 38 U1 1 U2 3 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1063-651X J9 PHYS REV E JI Phys. Rev. E PD MAR PY 1994 VL 49 IS 3 BP 1840 EP 1853 DI 10.1103/PhysRevE.49.1840 PG 14 WC Physics, Fluids & Plasmas; Physics, Mathematical SC Physics GA NC465 UT WOS:A1994NC46500014 ER PT J AU MORGAN, CA GRIEM, HR ELTON, RC AF MORGAN, CA GRIEM, HR ELTON, RC TI SPECTROSCOPIC MEASUREMENTS OF ELECTRON-DENSITY AND TEMPERATURE IN POLYACETAL-CAPILLARY-DISCHARGE PLASMAS SO PHYSICAL REVIEW E LA English DT Article ID SOFT-X-RAY; LASER-PRODUCED PLASMA; TRANSITIONS; LINES; GAIN AB Spectroscopic measurements were made of electron density and temperature histories in plasmas formed by 80-ns risetime, 6-16-kA peak current, pulsed discharges in 0.5- and 1-mm diameter, 1-cm-long polyacetal (CH2O)n capillaries. Electron densities (less than or similar 5 X 10(19) cm-3) and temperatures (less than or similar 50 eV) in the capillary were inferred by fitting axial, spatially integrated, time-gated spectra taken of O VI 3p-4d and 3d-4f emission with theoretical Stark-broadened profiles that were corrected for optical-depth effects. Off-axis (at 45-degrees to the capillary axis) time-gated spectra taken of C III 3p-3d and CIV 3s-3p emission from inside the hollow anode were used to infer the presence of a cooler (T(e) less-than-or-similar 25 eV), less dense (N(e) less than or similar 2 X 10(18) cm-3) plasma just outside the capillary. C1 UNIV MARYLAND,PLASMA RES LAB,COLL PK,MD 20742. USN,RES LAB,DIV PLASMA PHYS,WASHINGTON,DC 20375. NR 55 TC 35 Z9 36 U1 1 U2 4 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1063-651X J9 PHYS REV E JI Phys. Rev. E PD MAR PY 1994 VL 49 IS 3 BP 2282 EP 2290 DI 10.1103/PhysRevE.49.2282 PG 9 WC Physics, Fluids & Plasmas; Physics, Mathematical SC Physics GA NC465 UT WOS:A1994NC46500062 ER PT J AU CHEN, J HOLLAND, DL AF CHEN, J HOLLAND, DL TI PHYSICS OF THE MAGNETOTAIL CURRENT SHEET - REPLY SO PHYSICS OF PLASMAS LA English DT Note ID NONLINEAR DYNAMICS; FIELD C1 ILLINOIS STATE UNIV,DEPT PHYS,NORMAL,IL 61790. RP CHEN, J (reprint author), USN,RES LAB,BEAM PHYS BRANCH,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 1070-664X J9 PHYS PLASMAS JI Phys. Plasmas PD MAR PY 1994 VL 1 IS 3 BP 803 EP 804 DI 10.1063/1.870777 PG 2 WC Physics, Fluids & Plasmas SC Physics GA ND880 UT WOS:A1994ND88000043 ER PT J AU WIRTZ, JJ AF WIRTZ, JJ TI THE LOGIC OF ACCIDENTAL NUCLEAR-WAR - BLAIR,BG SO POLITICAL SCIENCE QUARTERLY LA English DT Book Review RP WIRTZ, JJ (reprint author), USN,POSTGRAD SCH,MONTEREY,CA 93940, USA. NR 1 TC 0 Z9 0 U1 0 U2 0 PU ACAD POLITICAL SCIENCE PI NEW YORK PA 475 RIVERSIDE DRIVE, SUITE 1274, NEW YORK, NY 10115-1274 SN 0032-3195 J9 POLIT SCI QUART JI Polit. Sci. Q. PD SPR PY 1994 VL 109 IS 1 BP 174 EP 175 DI 10.2307/2151665 PG 2 WC Political Science SC Government & Law GA NJ601 UT WOS:A1994NJ60100008 ER PT J AU PURDY, AP GEORGE, CF AF PURDY, AP GEORGE, CF TI SYNTHESIS AND STRUCTURE OF TRI-TERT-BUTOXYZINCATES SO POLYHEDRON LA English DT Article ID CRYSTAL-STRUCTURES; ALKOXIDES AB The reaction between 3 eq MOCMe3 (M = Na, K) and ZnCl2 in ethereal solvents affords the dimeric zincates M2[Zn(OCMe3)3]2 (1 M = Na, 2 M = K). The sodium derivative begins to sublime under vacuum at 50-degrees-C, and the potassium salt starts to sublime under vacuum at 90-degrees-C. Both zincates are soluble in hydrocarbon solvents. The X-ray crystal structures of both compounds were determined. The centrosymmetric structures consist of a (ZnOCMe3)2 ring with four terminal OCMe3 groups. An alkali metal ion is positioned above and below the Zn2O2 plane, each bonded to three oxygen atoms. C1 USN,RES LAB,STRUCT MAT LAB,WASHINGTON,DC 20375. RP PURDY, AP (reprint author), USN,RES LAB,DIV CHEM,CODE 6120,WASHINGTON,DC 20375, USA. NR 14 TC 20 Z9 20 U1 0 U2 2 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0277-5387 J9 POLYHEDRON JI Polyhedron PD MAR PY 1994 VL 13 IS 5 BP 709 EP 712 DI 10.1016/S0277-5387(00)81672-1 PG 4 WC Chemistry, Inorganic & Nuclear; Crystallography SC Chemistry; Crystallography GA NC545 UT WOS:A1994NC54500001 ER PT J AU IWAMOTO, N AF IWAMOTO, N TI A PROPERTY TREND STUDY OF POLYBENZIMIDAZOLE USING MOLECULAR MODELING SO POLYMER ENGINEERING AND SCIENCE LA English DT Article AB Molecular mechanics and dynamics have become a standard analysis tool used in drug design and synthesis, but it has not generally been used as part of structural and mechanical analysis. The need for such tools is an obvious extension of structure-property correlations known in polymer formulation, engineering, and manufacture. This study probes the use of mechanics and dynamics techniques to help explain property trends found in hydrated polybenzimidazole (PBI). RP IWAMOTO, N (reprint author), USN,CTR AIR WARFARE,DIV WEAPONS,RES DEPT,DIV CHEM,CHINA LAKE,CA 93555, USA. NR 6 TC 2 Z9 2 U1 0 U2 2 PU SOC PLASTICS ENG INC PI BROOKFIELD CENTER PA 14 FAIRFIELD DR, BROOKFIELD CENTER, CT 06804-0403 SN 0032-3888 J9 POLYM ENG SCI JI Polym. Eng. Sci. PD MAR PY 1994 VL 34 IS 5 BP 434 EP 437 DI 10.1002/pen.760340509 PG 4 WC Engineering, Chemical; Polymer Science SC Engineering; Polymer Science GA NB663 UT WOS:A1994NB66300008 ER PT J AU WILLIAMS, RA KLAPOW, JC SLATER, MA ATKINSON, JH GARFIN, SR WEBSTER, J CHANDLER, J AF WILLIAMS, RA KLAPOW, JC SLATER, MA ATKINSON, JH GARFIN, SR WEBSTER, J CHANDLER, J TI IDENTIFYING ACUTE LOW-BACK-PAIN PATIENTS AT RISK FOR CHRONICITY SO PSYCHOSOMATIC MEDICINE LA English DT Meeting Abstract C1 VET ADM MED CTR,SAN DIEGO,CA 92161. USN HOSP,SAN DIEGO,CA 92134. UNIV CALIF SAN DIEGO,SAN DIEGO,CA 92103. 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 0033-3174 J9 PSYCHOSOM MED JI Psychosom. Med. PD MAR-APR PY 1994 VL 56 IS 2 BP 150 EP 151 PG 2 WC Psychiatry; Psychology; Psychology, Multidisciplinary SC Psychiatry; Psychology GA NE119 UT WOS:A1994NE11900028 ER PT J AU ATKINSON, JH SLATER, MA WILLIAMS, RA PATTERSON, TL GRANT, I CHANDLER, J WEBSTER, J GARFIN, SR AF ATKINSON, JH SLATER, MA WILLIAMS, RA PATTERSON, TL GRANT, I CHANDLER, J WEBSTER, J GARFIN, SR TI PSYCHIATRIC-DISORDER IN ACUTE BACK PAIN SO PSYCHOSOMATIC MEDICINE LA English DT Meeting Abstract C1 VET ADM MED CTR,SAN DIEGO,CA 92161. USN HOSP,SAN DIEGO,CA 92134. UNIV CALIF SAN DIEGO,SAN DIEGO,CA 92103. 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 0033-3174 J9 PSYCHOSOM MED JI Psychosom. Med. PD MAR-APR PY 1994 VL 56 IS 2 BP 164 EP 164 PG 1 WC Psychiatry; Psychology; Psychology, Multidisciplinary SC Psychiatry; Psychology GA NE119 UT WOS:A1994NE11900083 ER PT J AU WILLIAMS, RA DOCTOR, JN SLATER, MA GARFIN, SR WEBSTER, J CHANDLER, J ATKINSON, JH AF WILLIAMS, RA DOCTOR, JN SLATER, MA GARFIN, SR WEBSTER, J CHANDLER, J ATKINSON, JH TI PREDICTING CHRONIC LOW-BACK-PAIN FROM PRE-INJURY JOB-SATISFACTION SO PSYCHOSOMATIC MEDICINE LA English DT Meeting Abstract C1 VET ADM MED CTR,SAN DIEGO,CA 92161. USN HOSP,SAN DIEGO,CA 92134. UNIV CALIF SAN DIEGO,SAN DIEGO,CA 92103. 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 0033-3174 J9 PSYCHOSOM MED JI Psychosom. Med. PD MAR-APR PY 1994 VL 56 IS 2 BP 167 EP 168 PG 2 WC Psychiatry; Psychology; Psychology, Multidisciplinary SC Psychiatry; Psychology GA NE119 UT WOS:A1994NE11900097 ER PT J AU WALKER, DN DUNCAN, D STRACKA, JA BOWLES, JH SIEFRING, CL BAUMBACK, MM RODRIGUEZ, P AF WALKER, DN DUNCAN, D STRACKA, JA BOWLES, JH SIEFRING, CL BAUMBACK, MM RODRIGUEZ, P TI A TUNABLE MICROWAVE PLASMA SOURCE FOR SPACE PLASMA SIMULATION EXPERIMENTS SO REVIEW OF SCIENTIFIC INSTRUMENTS LA English DT Article ID ION-SOURCE; CAVITY AB In laboratory experiments related to space plasma physics it is often desirable to produce plasmas with characteristics as close as possible to various naturally occurring plasma regimes. In the near-earth region space plasma densities typically vary from 10(3)-10(7) cm-3 and temperatures range from a few tenths of an eV to the order of 1 eV. The plasma parameters of electron density, electron temperature, and ion species are primary variables which are often not easy to reproduce in a chamber environment which is dependent upon conventional gas discharge or arc sources for plasma production. A simple microwave discharge device was developed which is easily tunable and capable of producing the moderate range of electron densities without an external magnetic field. The Asmussen-type microwave plasma source described here covers and exceeds the parameter ranges required, is relatively easy to construct, and is inexpensive. The device makes use of an air dielectric coaxial coupler to couple magnetron output to a resonant cavity. Estimates of effective electric fields and source densities and temperatures suggest that similar devices can easily be constructed and fashioned to produce these parameters, depending upon requirements, over a wide range of values. The use of widely available commercial magnetrons manufactured for microwave ovens allows a certain ease in the construction of these devices in that available cavity Q's can range to lower levels and therefore resonant lengths can be adjusted more easily. The design is discussed relative to desired experimental parameter ranges and some discussion is given of expected source current densities, electric fields, and temperature ranges. RP WALKER, DN (reprint author), USN,RES LAB,DIV PLASMA PHYS,CHARGED PARTICLE PHYS BRANCH,WASHINGTON,DC 20375, USA. NR 19 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 0034-6748 J9 REV SCI INSTRUM JI Rev. Sci. Instrum. PD MAR PY 1994 VL 65 IS 3 BP 661 EP 668 DI 10.1063/1.1145135 PG 8 WC Instruments & Instrumentation; Physics, Applied SC Instruments & Instrumentation; Physics GA NA930 UT WOS:A1994NA93000019 ER PT J AU MURPHY, DP PEYSER, TA PECHACEK, RE AF MURPHY, DP PEYSER, TA PECHACEK, RE TI A COMPACT, 4-WAY IMAGE SPLITTER SO REVIEW OF SCIENTIFIC INSTRUMENTS LA English DT Note AB A compact, four-way, optical image splitter is described which maintains equal intensity and equal optical path length in each arm of the apparatus. The four output beams are parallel with the input light beam. C1 LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550. SFA INC,LANDOVER,MD 20785. RP MURPHY, DP (reprint author), USN,RES LAB,DIV PLASMA PHYS,CHARGED PARTICLE BEAM PHYS BRANCH,WASHINGTON,DC 20375, USA. NR 1 TC 3 Z9 3 U1 2 U2 2 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0034-6748 J9 REV SCI INSTRUM JI Rev. Sci. Instrum. PD MAR PY 1994 VL 65 IS 3 BP 762 EP 763 DI 10.1063/1.1145101 PG 2 WC Instruments & Instrumentation; Physics, Applied SC Instruments & Instrumentation; Physics GA NA930 UT WOS:A1994NA93000040 ER PT J AU THOMPSON, CM ALLEN, JS AF THOMPSON, CM ALLEN, JS TI THE EFFECT OF MOLD PRESSURE ON THE ELECTRICAL-RESISTIVITY OF ELASTOMERS SO RUBBER CHEMISTRY AND TECHNOLOGY LA English DT Article AB Elastomers are commonly used as electrical insulators in marine acoustic devices. A previous paper discussed the very large decrease in electrical resistivity of a Neoprene GRT formulation when subjected to moderately high molding pressures. In the present paper, data will be presented showing similar dependencies on mold pressure for natural, polybutadiene, 39%-acrylonitrile NBR, and chlorobutyl elastomers and the absence of the effect for an EPDM, and a 27%-acrylonitrile NBR elastomer. These data are not easily explained. The previous paper also discussed that increasing the carbon-black loading caused the electrical resistivity to decrease at even lower molding pressures. Similar trends are presented here for the other elastomers whose electrical resistivities are dependent on molding pressure. Data will also be presented that show that the addition of poly-para-dinitrosobenzene (Poly DNB(R)) to a CR formulation will eliminate the mold pressure vs. electrical resistivity effect. RP THOMPSON, CM (reprint author), USN,RES LAB,UNDERWATER SOUND REFERENCE DETACHMENT,POB 568337,ORLANDO,FL 32856, USA. NR 12 TC 3 Z9 3 U1 0 U2 0 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 1994 VL 67 IS 1 BP 107 EP 118 DI 10.5254/1.3538657 PG 12 WC Polymer Science SC Polymer Science GA NH835 UT WOS:A1994NH83500008 ER PT J AU KAZARIAN, KK PERDUE, PW LYNCH, W DZIKI, A NEVOLA, J LEE, CH HAYWARD, I WILLIAMS, T LAW, WR AF KAZARIAN, KK PERDUE, PW LYNCH, W DZIKI, A NEVOLA, J LEE, CH HAYWARD, I WILLIAMS, T LAW, WR TI PORCINE PERITONEAL SEPSIS - MODELING FOR CLINICAL RELEVANCE SO SHOCK LA English DT Article ID SPLANCHNIC OXYGEN-CONSUMPTION; FECAL PERITONITIS; SEPTIC SHOCK; BLOOD-FLOW; TRANSLYMPHATIC ABSORPTION; INTRAPERITONEAL ENDOTOXIN; HYPERDYNAMIC SEPSIS; LABORATORY MODELS; HOST DEFENSE; DEFINITIONS AB The characteristics of two types of intraperitoneal (i.p.) soilage sepsis models, autologous fecal inoculum (FEC) and a pure culture of Escherichia coli (EC), were studied in 26 male Yucatan minipigs (20-30 kg). Early (1-4 h) and late (24-72 h) changes were different between the two groups. The EC group was characterized early by hypotension, low cardiac output, and increased systemic and pulmonary vascular resistances, along with leukopenia, hypoglycemia, lactacidemia, and elevated blood urea nitrogen. Of the pigs in the EC group that survived the early effects, there were few significant differences in physiological parameters, compared to control pigs, that would indicate ongoing pathological processes. In contrast, the FEC group pigs demonstrated early hypotension, but with increased cardiac output and reduced systemic vascular resistance. Other parameter changes were similar to those seen in the EC pigs, but to a lesser degree, with the exception of elevations in serum lactate dehydrogenase. Also in contrast to the EC group, most of the changes in the FEC group persisted in later days, and FEC pigs demonstrated leukocytosis. There were also greater elevations in circulating lipopolysaccharide (LPS) concentrations in the EC group that returned later to baseline levels. In the FEC group, there were persistently elevated LPS concentrations over 72 h. These observations suggest that pigs challenged with intraperitoneal E. coli demonstrated an initial acute peritonitis and damaging physiologic effects of high levels of circulating LPS. Survivors in this group improved and were physiologically stable after 24 h. Pigs that received i.p. autologous feces developed an early acute peritonitis phase with lower levels of circulating LPS, and later developed pronounced peritoneal reaction as demonstrated by multiple abdominal abscesses, pyogenic granuloma formation, and adhesions with physiological evidence of developing sepsis over 72 h. These observations indicate that i.p. EC models evoke a systemic response not unlike intravenous administration of LPS or EC, however, the FEC model produced a systemic response akin to a slower developing septic process. C1 NATL NAVAL MED CTR, DEPT SURG, BETHESDA, MD 20889 USA. UNIV ILLINOIS, DEPT SURG, CHICAGO, IL 60612 USA. UNIV ILLINOIS, DEPT PHYSIOL, CHICAGO, IL 60612 USA. UNIFORMED SERV UNIV HLTH SCI, BETHESDA, MD 20814 USA. RP KAZARIAN, KK (reprint author), USN, MED RES INST, SEPT SHOCK PROGRAM, BETHESDA, MD 20889 USA. NR 43 TC 26 Z9 26 U1 0 U2 2 PU BIOMEDICAL PRESS PI AUGUSTA PA 1021 15TH ST, BIOTECH PARK STE 9, AUGUSTA, GA 30901 SN 1073-2322 J9 SHOCK JI Shock PD MAR PY 1994 VL 1 IS 3 BP 201 EP 212 DI 10.1097/00024382-199403000-00008 PG 12 WC Critical Care Medicine; Hematology; Surgery; Peripheral Vascular Disease SC General & Internal Medicine; Hematology; Surgery; Cardiovascular System & Cardiology GA NP397 UT WOS:A1994NP39700008 PM 7735952 ER PT J AU QADRI, SB SKELTON, EF HARFORD, MZ KIM, C LUBITZ, P AF QADRI, SB SKELTON, EF HARFORD, MZ KIM, C LUBITZ, P TI ELECTRON-BEAM DEPOSITION OF ZRO2-SNO2 FILMS SO SURFACE & COATINGS TECHNOLOGY LA English DT Article AB Films of ZrO2-SnO2 were deposited by simultaneous electron beam evaporation of the two oxides. Films deposited on substrates at room temperature were amorphous whereas at a substrate temperature of 300-degrees-C they were crystalline. Films with less than 3 wt.% SnO2 nucleated in mixed phases of monoclinic and cubic ZrO2. Films with more than 3 wt.% SnO2 showed the cubic phase of the zirconia. These films will have potential applications in engine technology and other high temperature applications. RP USN, RES LAB, WASHINGTON, DC 20375 USA. NR 9 TC 3 Z9 3 U1 0 U2 2 PU ELSEVIER SCIENCE SA PI LAUSANNE PA PO BOX 564, 1001 LAUSANNE, SWITZERLAND SN 0257-8972 J9 SURF COAT TECH JI Surf. Coat. Technol. PD MAR PY 1994 VL 63 IS 3 BP 155 EP 157 DI 10.1016/0257-8972(94)90092-2 PG 3 WC Materials Science, Coatings & Films; Physics, Applied SC Materials Science; Physics GA NB605 UT WOS:A1994NB60500004 ER PT J AU ALTMAN, EI COLTON, RJ AF ALTMAN, EI COLTON, RJ TI GROWTH OF RH ON AU(111) - SURFACE INTERMIXING OF IMMISCIBLE METALS SO SURFACE SCIENCE LA English DT Letter ID SCANNING TUNNELING MICROSCOPY; EPITAXIAL-GROWTH; NUCLEATION; FILMS; RECONSTRUCTION; SUPERLATTICES; MONOLAYER; NI; FE AB The growth of Rh on Au(111) was studied using UHV-STM and Auger electron spectroscopy. At room temperature, Volmer-Weber cluster growth was observed as expected from the surface energies and the immiscibility of Rh and Au below 650-degrees-C. After annealing to 400-degrees-C, the Rh Auger intensity decreased and STM revealed the formation of Au islands on the surface. Atomic-resolution images obtained after annealing showed a high density of defects due to Rh incorporation within the Au terraces and beneath the Au islands. The results demonstrate surface intermixing and growth by surface atom displacement and formation of substrate islands even for these immiscible systems. RP ALTMAN, EI (reprint author), USN,RES LAB,DIV CHEM,CODE 6177,WASHINGTON,DC 20375, USA. NR 27 TC 54 Z9 54 U1 1 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 MAR 1 PY 1994 VL 304 IS 1-2 BP L400 EP L406 DI 10.1016/0039-6028(94)90740-4 PG 7 WC Chemistry, Physical; Physics, Condensed Matter SC Chemistry; Physics GA MZ122 UT WOS:A1994MZ12200002 ER PT J AU WYMAN, JF MOORE, TJ BURING, MS AF WYMAN, JF MOORE, TJ BURING, MS TI SIMPLE PROCEDURE FOR JUGULAR-VEIN CANNULATION OF RATS SO TOXICOLOGY METHODS LA English DT Article DE CANNULATION; RAT JUGULAR VEIN; SERIAL BLOOD SAMPLING; 22-GAUGE CATHETER; TOXICOKINETIC METHODS; INTRAVENOUS ADMINISTRATION; SIMPLE SURGICAL PROCEDURE ID METABOLISM AB Jugular vein cannulation of rats is a method widely used in biochemical toxicology studies to allow intravenous administration of toxicants and/or temporal collection of blood samples. Methods typically used for this surgery produce tissue trauma, may partially interrupt the systemic circulation, and require a fair amount of practice by the technician in order to achieve proficiency. The method described here is simple to perform, produces minimal trauma to the rat resulting in rapid recovery, and allows an intact circulation to be maintained. Following limited isolation of the vein by blunt dissection, a 22-gauge catheter is threaded into the bore of an 18-gauge needle, which, in turn, is inserted through the back of the neck and into the surgical field. The needle shaft is removed and the catheter inserted into the exposed jugular vein using another 18-gauge needle that has been longitudinally sectioned to make a trough to carry the catheter. Once the catheter is threaded into the vein, the needle shaft is removed and the vessel sealed with a silicone rubber patch and surgical glue. The insertion site at the back of the neck is similarly sealed and the ventral incision closed with surgical staples. The catheter is coiled and placed beneath a wrap of tape or a Velcro jacket. Patency can be maintained for more than a week using sterile saline flushes and heparin blocks. RP WYMAN, JF (reprint author), USN,MED RES INST,DETACHMENT TOXICOL,BLDG 433,2612 5TH ST,WRIGHT PATTERSON AFB,OH 45433, USA. NR 9 TC 4 Z9 4 U1 0 U2 0 PU TAYLOR & FRANCIS PI BRISTOL PA 1900 FROST ROAD, SUITE 101, BRISTOL, PA 19007-1598 SN 1051-7235 J9 TOXICOL METHOD JI Toxicol. Method. PD MAR PY 1994 VL 4 IS 1 BP 12 EP 18 DI 10.3109/15376519409049107 PG 7 WC Toxicology SC Toxicology GA NB264 UT WOS:A1994NB26400002 ER PT J AU MCCARTHY, MC HE, JK HYAMS, KC ELTIGANI, A KHALID, IO CARL, M AF MCCARTHY, MC HE, JK HYAMS, KC ELTIGANI, A KHALID, IO CARL, M TI ACUTE HEPATITIS-E INFECTION DURING THE 1988 FLOODS IN KHARTOUM, SUDAN SO TRANSACTIONS OF THE ROYAL SOCIETY OF TROPICAL MEDICINE AND HYGIENE LA English DT Note ID CHILDREN C1 USN,MED RES INST,BETHESDA,MD. NATL HLTH LAB,DEPT VIROL,KHARTOUM,SUDAN. RP MCCARTHY, MC (reprint author), USN,MED RES UNIT 3,CAIRO,EGYPT. NR 4 TC 12 Z9 13 U1 0 U2 1 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 1994 VL 88 IS 2 BP 177 EP 177 DI 10.1016/0035-9203(94)90284-4 PG 1 WC Public, Environmental & Occupational Health; Tropical Medicine SC Public, Environmental & Occupational Health; Tropical Medicine GA NL591 UT WOS:A1994NL59100016 PM 8036664 ER PT J AU JOYE, DD CLARKE, JR CARLSON, NA THALMANN, ED AF JOYE, DD CLARKE, JR CARLSON, NA THALMANN, ED TI CHARACTERIZATION AND MEASUREMENT OF ELASTANCE WITH APPLICATION TO UNDERWATER BREATHING APPARATUS SO UNDERSEA & HYPERBARIC MEDICINE LA English DT Article DE UNDERWATER BREATHING APPARATUS; ELASTANCE; ELASTANCE MEASUREMENT; ELASTIC LOAD-PRODUCING CONTAINERS; ELASTANCE MEASUREMENT CORRECTION AB Joye DD, Clarke JR, Carlson NA, Thalmann ED, Characterization and measurement of elastance with application to underwater breathing apparatus. Undersea and Hyperbaric Med 1994; 21(1):53-65.-The elastic loads inherent in underwater breathing apparatus (UBA) can affect diver performance. This work quantitatively examines elastance, its measurement by static tests, and its relationship to UBA. A rigid, fixed-volume container and a vertical water column with straight and parallel sides produce elastic loads that have application to closed-circuit UBA. We derived equations to describe the pressure-volume relationships of these elements from first principles and tested the equations experimentally for system pressure produced by a swept volume in a breathing machine. Our work demonstrates that simplified equations to describe elastance may not be sufficiently accurate for all situations. In addition, static measurements of elastance of a UBA or other element will not be reproducible unless all the volumes within the testing apparatus are accounted for; we provide experimental and mathematical techniques for doing so. RP JOYE, DD (reprint author), USN,MED RES INST,DIVING LIFE SUPPORT PROGRAM,BETHESDA,MD 20889, USA. NR 18 TC 3 Z9 3 U1 0 U2 0 PU UNDERSEA & HYPERBARIC MEDICAL SOC INC PI KENSINGTON PA 10531 METROPOLITAN AVE, KENSINGTON, MD 20895 SN 1066-2936 J9 UNDERSEA HYPERBAR M JI Undersea Hyperb. Med. PD MAR PY 1994 VL 21 IS 1 BP 53 EP 65 PG 13 WC Marine & Freshwater Biology; Medicine, Research & Experimental SC Marine & Freshwater Biology; Research & Experimental Medicine GA NE295 UT WOS:A1994NE29500006 PM 8180567 ER PT J AU NUSS, WA TITLEY, DW AF NUSS, WA TITLEY, DW TI DIAGNOSIS OF OCEANIC CYCLOGENESIS USING SURFACE-BASED Q-VECTORS SO WEATHER AND FORECASTING LA English DT Article AB The use of quasigeostrophic Q-vector diagnosis for marine cyclogenesis is examined for two cases from the Experiment on Rapidly Intensifying Cyclones over the Atlantic. Surface observations plus aircraft observations and satellite imagery are used to objectively analyze these cases, and Q vectors are calculated from these surface analyses. Although application of omega equation diagnosis at the surface stretches the theory, the relationship between vertical motion in cyclones and Q vectors suggests that a useful diagnosis can be made. The accuracy and usefulness of these surface-based Q vectors for the two cases are examined subjectively through comparisons tb satellite imagery and cyclone conceptual models as well as objectively through statistical comparison with future pressure tendencies. Results of these comparisons suggest that useful representations of the synoptic-scale vertical motion can be determined from a surface Q-vector diagnosis. This Q-vector diagnosis can be used to help assess the numerical model guidance routinely available to operational forecasters by highlighting regions of significant low-level forcing and providing insight into the future track of a developing cyclone. RP NUSS, WA (reprint author), USN,POSTGRAD SCH,DEPT METEOROL,MONTEREY,CA 93943, USA. NR 0 TC 0 Z9 0 U1 0 U2 1 PU AMER METEOROLOGICAL SOC PI BOSTON PA 45 BEACON ST, BOSTON, MA 02108-3693 SN 0882-8156 J9 WEATHER FORECAST JI Weather Forecast. PD MAR PY 1994 VL 9 IS 1 BP 136 EP 155 PG 20 WC Meteorology & Atmospheric Sciences SC Meteorology & Atmospheric Sciences GA QL523 UT WOS:A1994QL52300009 ER PT J AU KEEGAN, DR COBLENTZ, BE WINCHELL, CS AF KEEGAN, DR COBLENTZ, BE WINCHELL, CS TI FERAL GOAT ERADICATION ON SAN-CLEMENTE-ISLAND, CALIFORNIA SO WILDLIFE SOCIETY BULLETIN LA English DT Article DE CAPRA-HIRCUS; ERADICATION; FERAL GOAT; JUDAS GOATS; RADIOTELEMETRY; SAN-CLEMENTE-ISLAND C1 OREGON STATE UNIV,DEPT FISHERIES & WILDLIFE,CORVALLIS,OR 97331. USN,AIR STN N ISL,NAT RESOURCE OFF,SAN DIEGO,CA 92135. NR 16 TC 20 Z9 20 U1 2 U2 13 PU WILDLIFE SOC PI BETHESDA PA 5410 GROSVENOR LANE, BETHESDA, MD 20814-2197 SN 0091-7648 J9 WILDLIFE SOC B JI Wildl. Soc. Bull. PD SPR PY 1994 VL 22 IS 1 BP 56 EP 61 PG 6 WC Biodiversity Conservation SC Biodiversity & Conservation GA NA621 UT WOS:A1994NA62100009 ER PT J AU HOLDER, SL ROWAN, LG KREBS, JJ AF HOLDER, SL ROWAN, LG KREBS, JJ TI ELECTRON-PARAMAGNETIC-RESONANCE FORBIDDEN TRANSITIONS FROM HYDROGEN IN POLYCRYSTALLINE DIAMOND FILMS SO APPLIED PHYSICS LETTERS LA English DT Article ID CHEMICAL VAPOR-DEPOSITION; THIN-FILMS; DEFECTS; PASSIVATION AB Investigation of polycrystalline diamond films by electron paramagnetic resonance at 9.5 and 35 GHZ has revealed the presence of forbidden transitions resulting from a simultaneous microwave induced flipping of unpaired electron spins and environmental nuclear spins. The spacing of the resonance lines identifies hydrogen as the atom neighboring the paramagnetic active site. C1 USN,RES LAB,WASHINGTON,DC 20375. RP HOLDER, SL (reprint author), UNIV N CAROLINA,DEPT PHYS & ASTRON,CHAPEL HILL,NC 27599, USA. NR 12 TC 37 Z9 37 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 FEB 28 PY 1994 VL 64 IS 9 BP 1091 EP 1093 DI 10.1063/1.110942 PG 3 WC Physics, Applied SC Physics GA MZ337 UT WOS:A1994MZ33700012 ER PT J AU VOHRA, ST FABINY, L WIESENFELD, K AF VOHRA, ST FABINY, L WIESENFELD, K TI OBSERVATION OF INDUCED SUBCRITICAL BIFURCATION BY NEAR-RESONANT PERTURBATIONS SO PHYSICAL REVIEW LETTERS LA English DT Article ID NOISE RISE; SUPPRESSION; DYNAMICS; SYSTEMS; CHAOS AB We present the first experimental evidence that near-resonant perturbations produce a destabilizing shift of a subcritical bifurcation. This is in direct contrast to supercritical bifurcations, where near-resonant perturbations always suppress the instability. Using a normal form analysis we derive a generic scaling law relating the magnitude of the destabilizing shift mu to the perturbation amplitude epsilon and detuning frequency delta. The predictions are in excellent agreement with our experiments. In the limit of very small delta the shift obeys a pure scaling law, mu is-proportional-to (epsilon)2/3. C1 GEORGIA INST TECHNOL,DEPT PHYS,ATLANTA,GA 30332. RP VOHRA, ST (reprint author), USN,RES LAB,CODE 5670,WASHINGTON,DC 20375, USA. NR 18 TC 29 Z9 29 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0031-9007 J9 PHYS REV LETT JI Phys. Rev. Lett. PD FEB 28 PY 1994 VL 72 IS 9 BP 1333 EP 1336 DI 10.1103/PhysRevLett.72.1333 PG 4 WC Physics, Multidisciplinary SC Physics GA MZ286 UT WOS:A1994MZ28600008 ER PT J AU HOLT, RG GAITAN, DF ATCHLEY, AA HOLZFUSS, J AF HOLT, RG GAITAN, DF ATCHLEY, AA HOLZFUSS, J TI CHAOTIC SONOLUMINESCENCE SO PHYSICAL REVIEW LETTERS LA English DT Article ID SYNCHRONOUS PICOSECOND SONOLUMINESCENCE; BELOUSOV-ZHABOTINSKII REACTION; BUBBLE DYNAMICS; TIME-SERIES; CAVITATION; OSCILLATIONS; GEOMETRY AB Sonoluminescence (SL) is generated from single, stably oscillating bubbles in a stationary, time-periodic acoustic field. By measuring the time delay between flashes, the dynamics of the phenomenon has been investigated. While other researchers have concentrated on the remarkable periodic stability of the system, present results indicate that, for small variations in the governing parameters, period doubling, chaos, and quasiperiodicity can occur. The implications of the complex temporal behavior for the problem of determining the mechanism(s) for production of SL are discussed. C1 USN,POSTGRAD SCH,DEPT PHYS,MONTEREY,CA 93943. TH DARMSTADT,INST ANGEW PHYS,D-64289 DARMSTADT,GERMANY. RP HOLT, RG (reprint author), JET PROP LAB,MS 183-401,4800 OAK GROVE DR,PASADENA,CA 91109, USA. RI Holt, Ray/G-5677-2010; GAITAN, DARIO/N-2727-2016 OI GAITAN, DARIO/0000-0002-2139-8535 NR 35 TC 53 Z9 55 U1 2 U2 6 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0031-9007 J9 PHYS REV LETT JI Phys. Rev. Lett. PD FEB 28 PY 1994 VL 72 IS 9 BP 1376 EP 1379 DI 10.1103/PhysRevLett.72.1376 PG 4 WC Physics, Multidisciplinary SC Physics GA MZ286 UT WOS:A1994MZ28600019 ER PT J AU WRIGHT, J CREAMER, DB AF WRIGHT, J CREAMER, DB TI IMPROVED LINEAR REPRESENTATION OF SURFACE-WAVES .2. SLOWLY VARYING BOTTOMS AND CURRENTS SO JOURNAL OF FLUID MECHANICS LA English DT Article AB We extend the results of a previous paper to fluids of finite depth. We consider the Hamiltonian theory of waves on the free surface of an incompressible fluid, and derive the canonical transformation that eliminates the leading order of nonlinearity for finite depth. As in the previous paper we propose using the Lie transformation method since it seems to include a nearly correct implementation of short waves interacting with long waves. We show how to use the Eikonal method for slowly varying currents and/or depths in combination with the nonlinear transformation. We note that nonlinear effects are more important in water of finite depth. We note that a nonlinear action conservation law can be derived. C1 USN,RES LAB,WASHINGTON,DC 20375. RP WRIGHT, J (reprint author), UNIV CALIF SAN DIEGO,INST NONLINEAR SCI,LA JOLLA,CA 92093, USA. NR 10 TC 1 Z9 1 U1 0 U2 0 PU CAMBRIDGE UNIV PRESS PI NEW YORK PA 40 WEST 20TH STREET, NEW YORK, NY 10011-4211 SN 0022-1120 J9 J FLUID MECH JI J. Fluid Mech. PD FEB 25 PY 1994 VL 261 BP 65 EP 74 DI 10.1017/S0022112094000261 PG 10 WC Mechanics; Physics, Fluids & Plasmas SC Mechanics; Physics GA NA056 UT WOS:A1994NA05600005 ER PT J AU AYERS, JD HARRIS, VG SPRAGUE, JA ELAM, WT AF AYERS, JD HARRIS, VG SPRAGUE, JA ELAM, WT TI ON THE ROLE OF CU AND NB IN THE FORMATION OF NANOCRYSTALS IN AMORPHOUS FE73.5NB3CU1SI13.5B9 SO APPLIED PHYSICS LETTERS LA English DT Article ID ULTRAFINE GRAIN-STRUCTURE AB Extended x-ray absorption fine structure analysis of amorphous and partially crystallized samples of the soft magnetic alloy Fe73.5Nb3Cu1Si13.5B9 reveals that, even before heat treatment, a portion of the Cu is present in the form of tiny, close packed clusters. Analysis of the Nb-free alloy Fe76.5Cu1Si13.5B9 shows that the Cu clusters are not present in the quenched ribbons, but that fcc Cu precipitates form during heat treatment. Results suggest that the Cu clusters act to catalyze nucleation of Fe-rich nanocrystals, but that these clusters are formed on a finer scale when Nb is added to the alloy, perhaps because it helps to lower the solubility of Cu in the amorphous phase. RP AYERS, JD (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. RI Harris, Vincent/A-8337-2009 NR 10 TC 79 Z9 83 U1 1 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 21 PY 1994 VL 64 IS 8 BP 974 EP 976 DI 10.1063/1.110923 PG 3 WC Physics, Applied SC Physics GA MX448 UT WOS:A1994MX44800011 ER PT J AU SZPAK, S MOSIERBOSS, PA GABRIEL, CJ SMITH, JJ AF SZPAK, S MOSIERBOSS, PA GABRIEL, CJ SMITH, JJ TI ABSORPTION OF DEUTERIUM IN PALLADIUM RODS - MODEL VS EXPERIMENT SO JOURNAL OF ELECTROANALYTICAL CHEMISTRY LA English DT Article ID HYDROGEN AB The electrochemical charging of Pd rods by deuterium involves a complex coupling of electrochemical, interfacial and transport processes. In order to predict the overpotential, surface coverage and bulk loading of the electrode during charging, a model has been developed that incorporates the essential features of these processes and involves variables such as the electrochemical rate constants, the bulk diffusion coefficient and the charging current. Features of the computed time dependence of the bulk loading are then compared with published experimental charging curves. New microscopic observations and X-ray diffraction data provide further evidence for the details of the charging process. C1 USN,DIV E,SAN DIEGO,CA 92152. US DOE,WASHINGTON,DC 20585. RP SZPAK, S (reprint author), USN,NAVAL COMMAND,CTR CONTROL & OCEAN SURVEILLANCE,RDT,SAN DIEGO,CA 92152, USA. NR 9 TC 14 Z9 14 U1 1 U2 2 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 FEB 21 PY 1994 VL 365 IS 1-2 BP 275 EP 281 DI 10.1016/0022-0728(93)03051-P PG 7 WC Chemistry, Analytical; Electrochemistry SC Chemistry; Electrochemistry GA MX377 UT WOS:A1994MX37700034 ER PT J AU AGASSI, D RESTORFF, JB AF AGASSI, D RESTORFF, JB TI PSEUDOPOTENTIAL BAND CALCULATIONS ALONG A SYMMETRY AXIS - CENTRAL POTENTIAL SO JOURNAL OF PHYSICS-CONDENSED MATTER LA English DT Article ID ENVELOPE-FUNCTION APPROXIMATION; PBTE; SUPERLATTICES; FERROMAGNETS; PBSE AB A method for band-structure calculations along a symmetry axis is introduced. It entails a cylindrical-coordinate multipole expansion of the wavefunction and an exact reduction of the 3D Schrodinger equation into a set of 1D wave equations for the multipoles. Group-theoretic considerations and energy arguments imply good convergence, regardless of the unit-cell extension along the symmetry direction. Calculations of a test case, the band structure of PbSe along the [111] direction without spin-orbit coupling, demonstrate the method's good convergence. The method is expected to be particularly useful for structures highly anisotropic along a symmetry axis, e.g., superlattices. RP AGASSI, D (reprint author), USN,CTR SURFACE WARFARE,SILVER SPRING,MD 20903, USA. NR 30 TC 1 Z9 1 U1 0 U2 0 PU IOP PUBLISHING LTD PI BRISTOL PA TECHNO HOUSE, REDCLIFFE WAY, BRISTOL, ENGLAND BS1 6NX SN 0953-8984 J9 J PHYS-CONDENS MAT JI J. Phys.-Condes. Matter PD FEB 21 PY 1994 VL 6 IS 8 BP 1497 EP 1511 DI 10.1088/0953-8984/6/8/008 PG 15 WC Physics, Condensed Matter SC Physics GA MX815 UT WOS:A1994MX81500008 ER PT J AU UMSTADTER, D ESAREY, E KIM, J AF UMSTADTER, D ESAREY, E KIM, J TI NONLINEAR PLASMA-WAVES RESONANTLY DRIVEN BY OPTIMIZED LASER-PULSE TRAINS SO PHYSICAL REVIEW LETTERS LA English DT Article ID ACCELERATION; EXCITATION; GENERATION AB A method for generating large-amplitude plasma waves, which utilizes an optimized train of independently adjustable, intense laser pulses, is discussed and analyzed. Both the pulse widths and interpulse spacings are optimally determined such that resonance is maintained and the plasma wave amplitude is maximized. By mitigating the effects of both phase and resonant detuning, and by reducing laser-plasma instabilities, the use of appropriately tailored multiple laser pulses is a highly advantageous technique for accelerating electrons. Practical methods of producing the required pulse trains are suggested. C1 USN,RES LAB,DIV PLASMA PHYS,BEAM PHYS BRANCH,WASHINGTON,DC 20375. RP UMSTADTER, D (reprint author), UNIV MICHIGAN,CTR ULTRAFAST OPT SCI,ANN ARBOR,MI 48109, USA. RI Umstadter, Donald/A-1581-2016 OI Umstadter, Donald/0000-0002-2182-4346 NR 22 TC 97 Z9 99 U1 0 U2 6 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0031-9007 J9 PHYS REV LETT JI Phys. Rev. Lett. PD FEB 21 PY 1994 VL 72 IS 8 BP 1224 EP 1227 DI 10.1103/PhysRevLett.72.1224 PG 4 WC Physics, Multidisciplinary SC Physics GA MW693 UT WOS:A1994MW69300023 ER PT J AU BOCZAR, BP SCHARPF, WJ AF BOCZAR, BP SCHARPF, WJ TI INJECTION-SEEDED OPTICAL PARAMETRIC OSCILLATOR OPERATING IN THE REGION OF 486.1 NM SO APPLIED OPTICS LA English DT Article ID BETA-BAB2O4 AB An injection-seeded optical parametric oscillator operating near 486.1 nm has been demonstrated. The optical parametric oscillator was pumped by the third harmonic of a Nd:YAG laser and was frequency controlled by injecting an idler wave near 1313 nm from a Nd:YLF laser. A line-narrowed signal output of 0.014 nm was demonstrated. RP BOCZAR, BP (reprint author), USN, CTR WARFARE, AIRCRAFT DIV WARMINSTER, POB 5152, WARMINSTER, PA 18974 USA. NR 6 TC 3 Z9 3 U1 0 U2 1 PU OPTICAL SOC AMER PI WASHINGTON PA 2010 MASSACHUSETTS AVE NW, WASHINGTON, DC 20036 USA SN 0003-6935 J9 APPL OPTICS JI Appl. Optics PD FEB 20 PY 1994 VL 33 IS 6 BP 979 EP 981 PG 3 WC Optics SC Optics GA NA381 UT WOS:A1994NA38100011 PM 20862100 ER PT J AU GRISCOM, DL GINGERICH, ME FRIEBELE, EJ PUTNAM, M UNRUH, W AF GRISCOM, DL GINGERICH, ME FRIEBELE, EJ PUTNAM, M UNRUH, W TI FAST-NEUTRON RADIATION EFFECTS IN A SILICA-CORE OPTICAL-FIBER STUDIED BY A CCD-CAMERA SPECTROMETER SO APPLIED OPTICS LA English DT Article DE FIBER OPTICS; RADIATION EFFECTS; FAST-NEUTRON DAMAGE; CCD-CAMERA SPECTROPHOTOMETER ID WAVEGUIDES; ABSORPTION; GLASS; CENTERS AB A simple CCD-camera spectrometer was deployed at the Los Alamos Spallation Radiation Effects Facility to characterize fast-neutron irradiation effects in several silica-based optical fibers over the wavelength range approximately 450-1100 nm. The experimental arrangement allowed optical loss spectra to be developed from remotely recovered frame grabs at various times during irradiation without it being necessary to resort to cutback methods. Data recorded for a pure-silica-core/F-doped-silica-clad fiber displayed a peculiar artifact, which is described and mathematically modeled in terms of leaky modes propagating in an optical cladding that is substantially less susceptible to radiation-induced optical attenuation than is the core. Evidence from optical time-domain reflectometry supports the postulate that mode leakage into the cladding may be a result of light scattering from the tracks of ions displaced by the 14-MeV neutrons. These results suggest that fibers with fluorine doping in the core, as well as in the cladding, would be relatively resistant to radiation-induced attenuation in the UV-visible spectral region. C1 VIRGINIA POLYTECH INST & STATE UNIV, BLACKSBURG, VA 24061 USA. LOS ALAMOS NATL LAB, LOS ALAMOS, NM 87545 USA. RP GRISCOM, DL (reprint author), USN, RES LAB, DIV OPT SCI, WASHINGTON, DC 20375 USA. NR 21 TC 9 Z9 9 U1 2 U2 5 PU OPTICAL SOC AMER PI WASHINGTON PA 2010 MASSACHUSETTS AVE NW, WASHINGTON, DC 20036 USA SN 0003-6935 J9 APPL OPTICS JI Appl. Optics PD FEB 20 PY 1994 VL 33 IS 6 BP 1022 EP 1028 PG 7 WC Optics SC Optics GA NA381 UT WOS:A1994NA38100021 PM 20862110 ER PT J AU JOHNSON, JK PANAGIOTOPOULOS, AZ GUBBINS, KE AF JOHNSON, JK PANAGIOTOPOULOS, AZ GUBBINS, KE TI REACTIVE CANONICAL MONTE-CARLO - A NEW SIMULATION TECHNIQUE FOR REACTING OR ASSOCIATING FLUIDS SO MOLECULAR PHYSICS LA English DT Article ID DIRECTIONAL ATTRACTIVE FORCES; THERMODYNAMIC PERTURBATION-THEORY; LENNARD-JONES FLUIDS; PHASE-EQUILIBRIA; CHEMICAL ASSOCIATION; PARTIAL ENTHALPIES; SIMPLE-MODELS; IONIC FLUIDS; MIXTURES; ENSEMBLE AB A new simulation technique is developed for calculating the properties of chemically reactive and associating (hydrogen bonding, charge transfer) systems. We call this new method reactive canonical Monte Carlo (RCMC). In contrast to previous methods for treating chemical reactions, this algorithm is applicable to reactions involving a change in mole number. Stoichiometrically balanced reactions are attempted in the forward and reverse directions to achieve chemical equilibrium. The transition probabilities do not depend on the chemical potentials or chemical potential differences of any of the components. We also extend RCMC to work in concert with the isothermal-isobaric ensemble for simulating chemical reactions at constant pressure, and with the Gibbs ensemble for simultaneous calculation of phase and chemical equilibria. Association is treated as a chemical reaction in the RCMC formalism. Results are presented for dimerization of simple model associating fluids. In contrast to previous methods, the reactive Gibbs ensemble can be used to calculate phase equilibrium for associating fluids with very strong bonding sites. RCMC simulations are performed for nitric oxide dimerization and results are compared with available experimental data in the liquid phase. Agreement with experiment is excellent. Results for a vapour phase simulation are also in remarkable agreement with estimates based on second virial coefficient data. C1 CORNELL UNIV,SCH CHEM ENGN,ITHACA,NY 14853. RP JOHNSON, JK (reprint author), USN,RES LAB,COMPLEX SYST THEORY BRANCH,WASHINGTON,DC 20375, USA. RI Panagiotopoulos, Athanassios/K-2955-2014; Johnson, Karl/E-9733-2013 OI Panagiotopoulos, Athanassios/0000-0002-8152-6615; Johnson, Karl/0000-0002-3608-8003 NR 44 TC 110 Z9 111 U1 2 U2 16 PU TAYLOR & FRANCIS LTD PI LONDON PA ONE GUNDPOWDER SQUARE, LONDON, ENGLAND EC4A 3DE SN 0026-8976 J9 MOL PHYS JI Mol. Phys. PD FEB 20 PY 1994 VL 81 IS 3 BP 717 EP 733 DI 10.1080/00268979400100481 PG 17 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA MY294 UT WOS:A1994MY29400016 ER PT J AU NAUGLE, DK SORENSON, RB KISER, WR AF NAUGLE, DK SORENSON, RB KISER, WR TI ROUTINE VS SELECTIVE EPISIOTOMY SO LANCET LA English DT Letter RP NAUGLE, DK (reprint author), USN HOSP,DEPT FAMILY MED,JACKSONVILLE,FL 32214, USA. NR 0 TC 0 Z9 0 U1 0 U2 1 PU LANCET LTD PI LONDON PA 42 BEDFORD SQUARE, LONDON, ENGLAND WC1B 3SL SN 0140-6736 J9 LANCET JI Lancet PD FEB 19 PY 1994 VL 343 IS 8895 BP 487 EP 487 PG 1 WC Medicine, General & Internal SC General & Internal Medicine GA MW690 UT WOS:A1994MW69000057 PM 7905989 ER PT J AU MARCHYWKA, M BINARI, SC MOSES, D AF MARCHYWKA, M BINARI, SC MOSES, D TI OBSERVATION OF CHARGE STORAGE IN DIAMOND MIS CAPACITORS SO ELECTRONICS LETTERS LA English DT Article DE METAL-INSULATOR-SEMICONDUCTOR DEVICES; CAPACITORS AB Diamond MIS capacitors have been fabricated on naturai diamond with a CVD SiO2 dielectric. By suitably cleaning the substrate and annealing the deposited film, the authors obtained good silicon dioxide to diamond adhesion. The resulting devices were characterised by current-voltage, capacitance-voltage, and capacitance-time curves under illumination. The authors demonstrated that the devices have leakage current sufficiently low to allow formation of an inversion layer. Devices were biased into deep depletion and then inverted with photogenerated carriers. RP MARCHYWKA, M (reprint author), USN,RES LAB,4555 OVERLOOK AVE SW,WASHINGTON,DC 20375, USA. NR 8 TC 0 Z9 0 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 FEB 17 PY 1994 VL 30 IS 4 BP 365 EP 366 DI 10.1049/el:19940053 PG 2 WC Engineering, Electrical & Electronic SC Engineering GA MY754 UT WOS:A1994MY75400063 ER PT J AU KRUPPA, W BOOS, JB AF KRUPPA, W BOOS, JB TI TRANSIENT-RESPONSE MEASUREMENT OF KINK EFFECT IN INALAS/INGAAS/INP HEMTS SO ELECTRONICS LETTERS LA English DT Article DE HIGH ELECTRON MOBILITY TRANSISTORS; TRANSIENT RESPONSE AB The kink effect in InAlAs/InGaAs/InP HEMTs is examined in the time domain with the use of voltage pulses applied to the drain of the device. The transient response shows opposite slopes below and above the kink voltage associated with carrier capture and emission. The results are found to be consistent with frequency-domain dispersion measurements made on the output resistance. The causes and time constants of the transients are discussed. C1 SFA INC,LANDOVER,MD 20785. RP KRUPPA, W (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 4 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 FEB 17 PY 1994 VL 30 IS 4 BP 368 EP 369 DI 10.1049/el:19940037 PG 2 WC Engineering, Electrical & Electronic SC Engineering GA MY754 UT WOS:A1994MY75400065 ER PT J AU DUNLAP, BI BRENNER, DW SCHRIVER, GW AF DUNLAP, BI BRENNER, DW SCHRIVER, GW TI SYMMETRICAL ISOMERS OF C60H36 SO JOURNAL OF PHYSICAL CHEMISTRY LA English DT Letter ID BUCKMINSTERFULLERENE; APPROXIMATIONS AB Local density functional electronic structures of four isomers of C60H36, which have been proposed in the literature, are studied at geometries given by an empirical potential The conjugation of the unsaturated bonds is quite different in each structure, yet the ionization potentials of each are the same within 0.12 eV. There is even greater agreement among the electron affinities, which are negative. The tetrahedral isomer with four six-membered rings of unsaturated carbon atoms is energetically the most stable. C1 EXXON CHEM CO,LINDEN,NJ 07036. RP DUNLAP, BI (reprint author), USN,RES LAB,THEORET CHEM SECT,CODE 6179,WASHINGTON,DC 20375, USA. RI Brenner, Donald/D-1741-2009; OI Dunlap, Brett/0000-0003-1356-6559 NR 25 TC 61 Z9 61 U1 0 U2 1 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0022-3654 J9 J PHYS CHEM-US JI J. Phys. Chem. PD FEB 17 PY 1994 VL 98 IS 7 BP 1756 EP 1757 DI 10.1021/j100058a006 PG 2 WC Chemistry, Physical SC Chemistry GA MX854 UT WOS:A1994MX85400006 ER PT J AU MILES, MH BUSH, BF STILWELL, DE AF MILES, MH BUSH, BF STILWELL, DE TI CALORIMETRIC PRINCIPLES AND PROBLEMS IN MEASUREMENTS OF EXCESS POWER DURING PD-D2O ELECTROLYSIS SO JOURNAL OF PHYSICAL CHEMISTRY LA English DT Article ID ELECTROCHEMICAL-CELLS; FUSION; DEUTERIUM; PALLADIUM; WATER AB A major experimental problem in many isoperibolic calorimetric studies is the fact that the decrease in the electrolyte level due to electrolysis produces a significant decrease in the apparent calorimetric cell constant if the temperature is measured in the electrolyte of the electrochemical cell. Furthermore, heat transport pathways out of the top of the cell can produce large errors, especially at low power levels. There is no steady state in electrochemical calorimetry, so accurate results require the evaluation of all terms in the differential equation governing the calorimeter; These factors have contributed to the controversy involving measurements of excess power during Pd-D2O + LiOD electrolysis experiments. A critical analysis is presented for several key publications that have impacted this scientific topic. RP MILES, MH (reprint author), USN,CTR AIR WARFARE,DIV WEAP,RES DEPT,DIV CHEM,CHINA LAKE,CA 93555, USA. NR 13 TC 12 Z9 12 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0022-3654 J9 J PHYS CHEM-US JI J. Phys. Chem. PD FEB 17 PY 1994 VL 98 IS 7 BP 1948 EP 1952 DI 10.1021/j100058a038 PG 5 WC Chemistry, Physical SC Chemistry GA MX854 UT WOS:A1994MX85400038 ER PT J AU VANDENBOSCH, G GROESENEKEN, G MAES, HE KLEIN, RB AF VANDENBOSCH, G GROESENEKEN, G MAES, HE KLEIN, RB TI OXIDE AND INTERFACE DEGRADATION RESULTING FROM SUBSTRATE HOT-HOLE INJECTION IN METAL-OXIDE-SEMICONDUCTOR FIELD-EFFECT TRANSISTORS AT 295-K AND 77-K SO JOURNAL OF APPLIED PHYSICS LA English DT Article ID MOS DEVICES; STATE GENERATION; SILICON DIOXIDE; LOW-TEMPERATURE; TRAPPED HOLES; DEPENDENCE; SIO2; MOSFETS; IRRADIATION AB Substrate hot-hole injection (SHI) induced hole trapping and interface trap generation have been characterized at 295 and 77 K. At both temperatures, the trapping is independent of the injection conditions in the silicon, and is fairly insensitive to the oxide field. Initial trapping efficiencies are about 2.5 times higher at 77 K. The experiments show that essentially the same traps are being filled at the two temperatures, and that the increase in trapping efficiency can be attributed to a larger effective cross section of the traps at 77 K. Hot-hole induced interface trap generation is observed to be independent of the injection conditions in the silicon, and to decrease with increasing oxide field magnitude. More interface traps are generated at 77 K for the same injected fluence. This is in contrast to the characteristics of irradiation-induced interface trap generation. The presence of holes at the Si-SiO2 interface is the key factor in the direct interface trap generation process acting during hot-hole injection. Following low-temperature SHI, an additional temperature-activated generation mechanism, attributed to the migration of H+, is observed in isochronal anneal experiments. This delayed mechanism is identical to the one that accounts for most of the irradiation-induced interface trap generation. C1 SACHS FREEMAN ASSOCIATES INC,LANDOVER,MD 20785. USN,RES LAB,WASHINGTON,DC 20375. RP VANDENBOSCH, G (reprint author), IMEC,KAPELDREEF 75,B-3001 LOUVAIN,BELGIUM. NR 32 TC 24 Z9 24 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 1994 VL 75 IS 4 BP 2073 EP 2080 DI 10.1063/1.356311 PG 8 WC Physics, Applied SC Physics GA MX654 UT WOS:A1994MX65400036 ER PT J AU FROST, AE SEAVER, M RUBEL, GO AF FROST, AE SEAVER, M RUBEL, GO TI DELAYED APPEARANCE OF THE LIQUID-CONDENSED PHASE IN 1-OCTADECANOL FILMS ON LEVITATED WATERDROPS SO JOURNAL OF CHEMICAL PHYSICS LA English DT Article ID OCTADECANOL MONOLAYERS; WIND-TUNNEL; EVAPORATION; KINETICS AB We have observed dramatic delays in the formation of the liquid-condensed phase of 1-octadecanol thin films on the surface of levitated water drops as the drops evaporate into a flowing gas stream. When the aqueous substrate starts with more than 1.0X10(-4) M EU(3+) (EDTA), the liquid-condensed phase of 1-octadecanol appears, as expected, at a surface concentration equivalent to one monolayer. As we reduce the initial EU(3+) (EDTA) content, higher and higher surface concentrations of 1-octadecanol are reached prior to the appearance of the liquid-condensed phase. At initial concentrations of EU(3+) (EDTA) below similar to 4.0X10(-7) M, the average surface concentration at the liquid-condensed phase change exceeds ten monolayers. Light-scattering data attest to the presence of small, <400 nm radius, 1-octadecanol particles initially dispersed throughout the substrate. We demonstrate that these particles are collected by the shrinking drop surface with minimal diffusion of the particles to the surface. C1 USA,ARMAMENT MUNIT & CHEM COMMAND,CTR CHEN RES DEV & ENGN,ABERDEEN PROVING GROUND,MD 21010. RP FROST, AE (reprint author), USN,RES LAB,CODE 5610,WASHINGTON,DC 20375, USA. NR 28 TC 4 Z9 4 U1 0 U2 1 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0021-9606 J9 J CHEM PHYS JI J. Chem. Phys. PD FEB 15 PY 1994 VL 100 IS 4 BP 3268 EP 3275 DI 10.1063/1.466417 PG 8 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA MX628 UT WOS:A1994MX62800091 ER PT J AU ALFONSO, DR ULLOA, SE BRENNER, DW AF ALFONSO, DR ULLOA, SE BRENNER, DW TI HYDROCARBON ADSORPTION ON A DIAMOND (100) STEPPED SURFACE SO PHYSICAL REVIEW B LA English DT Article ID CHEMICAL VAPOR-DEPOSITION; FILMS; GROWTH; SIMULATIONS; METHYL AB We present theoretical studies of various hydrocarbon radicals and molecules on the (100) surface of diamond. We use molecular dynamics and a dynamical quenching algorithm to calculate the energetics of different adsorption configurations, allowing for full relaxation of the underlying lattice. We use a parametrized many-body potential function that has been used for energetics calculations with a great deal of success [D. Brenner, Phys. Rev. B 42, 9458 (1990)]. Our calculations show that adsorption of hydrocarbons on either the flat terraces or near different types of step edges give small variations of binding energies and equilibrium configurations. This reflects the strong covalent bonding pervasive in the carbon systems, which forces the strain fields and bonding energetics to be determined to a great extent by the local environments. We analyze the consequences of these results for the dynamics of growth under typical conditions. C1 OHIO UNIV,DEPT PHYS & ASTRON,ATHENS,OH 45701. USN,RES LAB,THEORET CHEM SECT,WASHINGTON,DC 20375. OHIO UNIV,CONDENSED MATTER & SURFACE SCI PROGRAM,ATHENS,OH 45701. RP ALFONSO, DR (reprint author), OHIO UNIV,DEPT CHEM,ATHENS,OH 45701, USA. RI Brenner, Donald/D-1741-2009; Ulloa, Sergio/F-4621-2011 OI Ulloa, Sergio/0000-0002-3091-4984 NR 27 TC 43 Z9 44 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 FEB 15 PY 1994 VL 49 IS 7 BP 4948 EP 4953 DI 10.1103/PhysRevB.49.4948 PG 6 WC Physics, Condensed Matter SC Physics GA MZ448 UT WOS:A1994MZ44800070 ER PT J AU DUNLAP, BI AF DUNLAP, BI TI RELATING CARBON TUBULES SO PHYSICAL REVIEW B LA English DT Article ID ELECTRONIC-STRUCTURE; GRAPHENE TUBULES; ENERGETICS; NANOTUBES; C-60; MICROTUBULES; FULLERENES; MODEL AB Two methods for relating different carbon tubules are described. A single graphene ribbon of infinite length but finite width can be coiled to form an infinite set of tubules, each of which has a unique pitch or helicity. This maps in a one-to-one fashion the translation/rotation operations of the group of each tubule in the set. Within the set all irreducible representations are collected into the same number of bands. Alternatively, tubules can be imagined to be pressed flat so that centers of six-member rings lie along the crease. The direction of their creases on a graphene sheet relate tubules having the same helicity but different numbers of identical rotationally symmetric subunits around their circumference. These sets help to reconcile the different expressions for band structure of tubules. These sets also help sort the various ways to join semi-infinite tubules. A perfect infinite tubule is composed entirely of hexagons. Adding one heptagon and one pentagon transforms half of the tubule into a different tubule. The two ways to group tubules suggest that the least distortion of neighboring hexagons occurs if the heptagon and pentagon are joined together or are separated to opposite sides of the tubule. In the latter case, the tubule could be imagined to be flattened so that the heptagon and pentagon are folded in half, one along each crease. This heptagon-pentagon defect best connects sets of tubules in a pairwise fashion. The paired sets of tubules have axis vectors that meet at a 30-degrees angle on a graphene sheet. This analysis and experimental considerations suggest that the ideal bend in a tubule caused by a heptagon-pentagon pair is likely to be 30-degrees. Because entire sets of tubules are joined in similar fashion, tailoring of tubule electronic properties can be imagined. RP DUNLAP, BI (reprint author), USN,RES LAB,THEORET PHYS SECT,CODE 6179,WASHINGTON,DC 20375, USA. OI Dunlap, Brett/0000-0003-1356-6559 NR 48 TC 177 Z9 178 U1 0 U2 12 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 1994 VL 49 IS 8 BP 5643 EP 5650 DI 10.1103/PhysRevB.49.5643 PG 8 WC Physics, Condensed Matter SC Physics GA MY972 UT WOS:A1994MY97200060 ER PT J AU GREUS, C SPIEGEL, R KNIPP, PA REINECKE, TL FALLER, F FORCHEL, A AF GREUS, C SPIEGEL, R KNIPP, PA REINECKE, TL FALLER, F FORCHEL, A TI PHOTOLUMINESCENCE EXCITATION STUDY OF LATERAL-SUBBAND STRUCTURE IN BARRIER-MODULATED IN0.09GA0.91AS QUANTUM WIRES SO PHYSICAL REVIEW B LA English DT Note ID WELL WIRES; CONFINEMENT; HETEROSTRUCTURES; BOXES AB Barrier-modulated In0.09Ga0.91 As/GaAs quantum wires with widths down to 18 nm have been studied by photoluminescence and photoluminescence excitation spectroscopy. Up to three transitions arising from different laterally confined electron and hole subbands were observed for varying wire widths in photoluminescence excitation experiments. The experimentally determined dependence of the transitions of the three subbands on the wire width is described well by detailed calculations made using the geometrical dimensions of the wires. C1 CHRISTOPHER NEWPORT UNIV,DEPT PHYS & COMP SCI,NEWPORT NEWS,VA 23606. USN,RES LAB,WASHINGTON,DC 20375. RP GREUS, C (reprint author), UNIV WURZBURG,HUBLAND,D-97074 WURZBURG,GERMANY. OI Forchel, Alfred/0000-0002-9377-9935 NR 18 TC 22 Z9 22 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 1994 VL 49 IS 8 BP 5753 EP 5756 DI 10.1103/PhysRevB.49.5753 PG 4 WC Physics, Condensed Matter SC Physics GA MY972 UT WOS:A1994MY97200083 ER PT J AU VOHRA, ST FABINY, L BUCHOLTZ, F AF VOHRA, ST FABINY, L BUCHOLTZ, F TI OBSERVATION OF RESIDUAL STRAIN IN DYNAMICALLY EXCITED ELECTROSTRICTORS SO APPLIED PHYSICS LETTERS LA English DT Article ID RELAXOR FERROELECTRICS; SENSOR AB We measured the dynamic small strain effects in electrostrictive ceramics with a high resolution fiber optic interferometer. The dynamic strain response of both a lead magnesium niobate (PMN) and a lead zirconate titanate (PZT)-based electrostrictive ceramic exhibited a residual signal which cannot be understood by the simple scalar strain-polarization relationship, e = QP(2). The magnitude of the residual signal decreased as a function of increasing temperature indicating that the residual strain signal has origins in the remnant electric polarization of the material. The magnitude of the residual strain was generally higher for the PZT-based electrostrictor than for the PMN based sample. The observed residual strain signal represents a novel phenomenon previously unseen in the dynamical strain response of electrostrictive ceramics. RP VOHRA, ST (reprint author), USN,RES LAB,DIV OPT SCI,CODE 5670,WASHINGTON,DC 20375, USA. NR 8 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 0003-6951 J9 APPL PHYS LETT JI Appl. Phys. Lett. PD FEB 14 PY 1994 VL 64 IS 7 BP 848 EP 850 DI 10.1063/1.111000 PG 3 WC Physics, Applied SC Physics GA MW310 UT WOS:A1994MW31000014 ER PT J AU KRATZKE, RA HOGG, A OTTERSON, GA COXON, AB GERADTS, J COWELL, JK KAYE, FJ AF KRATZKE, RA HOGG, A OTTERSON, GA COXON, AB GERADTS, J COWELL, JK KAYE, FJ TI INCOMPLETE PENETRANCE OF FAMILIAL RETINOBLASTOMA AND BENIGN RETINAL TUMORS ASSOCIATED WITH PARTIAL INACTIVATION OF THE RB PRODUCT SO JOURNAL OF CELLULAR BIOCHEMISTRY LA English DT Meeting Abstract C1 USN,NCI,MED ONCOL BRANCH,BETHESDA,MD 20889. UNIFORMED SERV UNIV HLTH SCI,BETHESDA,MD 20889. IMPERIAL CANC RES FUND,INST CHILD HLTH,LONDON WC1N 1EH,ENGLAND. MOLEC ONCOL INC,GAITHERSBURG,MD 20878. RI kaye, frederic/E-2437-2011 NR 0 TC 0 Z9 0 U1 0 U2 0 PU WILEY-LISS PI NEW YORK PA DIV JOHN WILEY & SONS INC 605 THIRD AVE, NEW YORK, NY 10158-0012 SN 0730-2312 J9 J CELL BIOCHEM JI J. Cell. Biochem. PD FEB 13 PY 1994 SU 18C BP 200 EP 200 PG 1 WC Biochemistry & Molecular Biology; Cell Biology SC Biochemistry & Molecular Biology; Cell Biology GA MY175 UT WOS:A1994MY17500718 ER PT J AU HUBER, CA HUBER, TE SADOQI, M LUBIN, JA MANALIS, S PRATER, CB AF HUBER, CA HUBER, TE SADOQI, M LUBIN, JA MANALIS, S PRATER, CB TI NANOWIRE ARRAY COMPOSITES SO SCIENCE LA English DT Article ID GLASS AB Long, nanometer-size metallic wires can be synthesized by injection of the conducting melt into nanochannel insulating plates. Large-area arrays of parallel wires 200 nanometers in diameter and 50 micrometers long with a packing density of 5 x 10(8) per square centimeter have been fabricated in this way. When charged, the ends of the wires generate strong, short-range electric fields. The nanowire electric fields have been imaged at high spatial resolution with a scanning force microscope. C1 POLYTECH INST NEW YORK,DEPT PHYS,BROOKLYN,NY 11201. HOWARD UNIV,WASHINGTON,DC 20059. DIGITAL INSTRUMENTS,SANTA BARBARA,CA 93103. RP HUBER, CA (reprint author), USN,CTR SURFACE WARFARE,DEPT RES & TECHNOL,SILVER SPRING,MD 20903, USA. NR 16 TC 248 Z9 253 U1 6 U2 56 PU AMER ASSOC ADVANCEMENT SCIENCE PI WASHINGTON PA 1200 NEW YORK AVE, NW, WASHINGTON, DC 20005 SN 0036-8075 J9 SCIENCE JI Science PD FEB 11 PY 1994 VL 263 IS 5148 BP 800 EP 802 DI 10.1126/science.263.5148.800 PG 3 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA MV866 UT WOS:A1994MV86600032 PM 17770836 ER PT J AU COLLISON, AJ NEDOLUHA, GE AF COLLISON, AJ NEDOLUHA, GE TI PUMPING OF MAIN LINE OH MASERS IN THE CIRCUMSTELLAR ENVELOPES OF OH/INFRARED STARS SO ASTROPHYSICAL JOURNAL LA English DT Article DE CIRCUMSTELLAR MATTER; ISM, JETS AND OUTFLOWS; MASERS; STARS, LATE-TYPE ID MASS-LOSS RATES; IR STARS; MIRA VARIABLES; DUST SHELLS; OH/IR STARS; RED GIANTS; U-ORIONIS; EMISSION; OVERLAP; MODELS AB Models are presented for the pumping of the main line OH masers in the circumstellar shells of optically thick OH/IR stars. The effects of nonlocal far-IR (FIR) line overlaps, collisional excitations, and dust FIR pumping are included in the calculations of the level populations of OH. We also investigate the effect of a near-IR (NIR) overlap and show that an overlap with a strong transition of H2O is possible. These calculations are carried out within the context of a simple model of the outflow and thus incorporate the variation of pumping conditions with radius. The resulting population distribution gives the spatial location and relative strengths of the four ground state maser lines of OH. A comparison is made to recent observations of main line emission from OH/IR stars. We find general qualitative agreement between the models and these observations. Though for thick shells FIR overlaps alone appear to be able to reproduce the observations, a NIR overlap may be necessary to explain the observed emission from thinner shells, as has been suggested previously for type I Mira variables (Collision and Nedoluha 1993). RP COLLISON, AJ (reprint author), USN,RES LAB,DIV REMOTE SENSING,CODE 7200,WASHINGTON,DC 20375, USA. NR 50 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 FEB 10 PY 1994 VL 422 IS 1 BP 193 EP 204 DI 10.1086/173717 PN 1 PG 12 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA MU690 UT WOS:A1994MU69000019 ER PT J AU CARGILL, PJ AF CARGILL, PJ TI SOME IMPLICATIONS OF THE NANOFLARE CONCEPT SO ASTROPHYSICAL JOURNAL LA English DT Article DE MHD; SUN, CORONA; SUN, FLARES ID SOLAR TRANSITION REGION; X-RAY; MAGNETIC-FIELD; ENERGY-BALANCE; TEMPERATURE-GRADIENTS; THERMAL CONDUCTION; CORONAL PLASMA; ACTIVE REGIONS; CURRENT SHEETS; SURFACE-WAVES AB The concept that the corona is heated by small hares (named ''nanoflares'' by Parker) is examined. A model in which the closed, active region corona is comprised of many hundred of small elemental flux loops randomly heated by nanoflares is presented. The cooling of these flux loops is examined using analytic techniques. It is assumed that the heated loops cool initially by conduction and at later times by radiation. Radiative cooling with and without downward mass flows are discussed, and the experimental signatures of such a coronal model are predicted. The distribution of temperatures in these loops peaks at around 2 x 10(6) K, while the distribution of densities peaks above 10(10) cm(-3). For 2 x 10(5) K < T < 10(6) K, radiative cooling with mass flows gives an emission measure that scales as T-1.5 in agreement with existing observations. For T > 10(6) K, the emission measure increases more steeply, scaling as T-4.5. These scalings are entirely due to the temperature dependence of the radiative loss function. It is shown that such a loop model has filling factors (defined as the ratio of the volume of hot plasma to the total volume) of order unity for subarcsecond energy release scales. A brief survey of the dependence of the results on the parameters of the system is presented. The temperature distribution function and emission measure are relatively insensitive to the loop length, coronal energy loss, number of elemental loops, and nanoflare energy, but the filling factor is dependent on these quantities. A simple scaling for this dependence is presented. C1 SCI APPLICAT INT CORP,WASHINGTON,DC 20375. RP CARGILL, PJ (reprint author), USN,RES LAB,DIV PLASMA PHYS,BEAM PHYS BRANCH,CODE 6790,WASHINGTON,DC 20375, USA. NR 76 TC 179 Z9 180 U1 1 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 FEB 10 PY 1994 VL 422 IS 1 BP 381 EP 393 DI 10.1086/173733 PN 1 PG 13 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA MU690 UT WOS:A1994MU69000035 ER PT J AU CARLSON, RL JACOBSON, RS AF CARLSON, RL JACOBSON, RS TI UPPER CRUSTAL STRUCTURE AS A FUNCTION OF PLATE AGE - COMMENT SO JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH LA English DT Editorial Material ID EAST PACIFIC RISE; OCEANIC-CRUST; SEISMIC REFRACTION; VELOCITY STRUCTURE; EVOLUTION; ATLANTIC; POROSITY; AREA C1 TEXAS A&M UNIV, GEODYNAM RES INST, COLL STN, TX 77843 USA. OFF NAVAL RES, ARLINGTON, VA USA. RP CARLSON, RL (reprint author), TEXAS A&M UNIV, DEPT GEOPHYS, COLL STN, TX 77843 USA. NR 22 TC 10 Z9 10 U1 0 U2 2 PU AMER GEOPHYSICAL UNION PI WASHINGTON PA 2000 FLORIDA AVE NW, WASHINGTON, DC 20009 USA SN 2169-9313 EI 2169-9356 J9 J GEOPHYS RES-SOL EA JI J. Geophys. Res.-Solid Earth PD FEB 10 PY 1994 VL 99 IS B2 BP 3135 EP 3138 DI 10.1029/93JB03013 PG 4 WC Geochemistry & Geophysics SC Geochemistry & Geophysics GA MW736 UT WOS:A1994MW73600040 ER PT J AU RABBANY, SY KUSTERBECK, AW BREDEHORST, R LIGLER, FS AF RABBANY, SY KUSTERBECK, AW BREDEHORST, R LIGLER, FS TI EFFECT OF ANTIBODY DENSITY ON THE DISPLACEMENT KINETICS OF A FLOW IMMUNOASSAY SO JOURNAL OF IMMUNOLOGICAL METHODS LA English DT Article DE BIOSENSOR; DISPLACEMENT IMMUNOASSAY; ANTIBODY KINETICS; SOLID-PHASE IMMUNOASSAY ID SURFACE-IMMOBILIZED ANTIGEN; BINDING AB This study investigates the effect of antibody density on the kinetics of a solid-phase displacement immunoassay. Conducted in flow under nonequilibrium conditions, the assay utilizes a monoclonal antibody to the cocaine metabolite benzoylecgonine, which has been immobilized onto Sepharose beads and saturated with fluorophore-labeled antigen. Displacement of antibody-bound labeled antigen by non-labeled antigen occurs when sample is introduced in the buffer flow. Comparison of matrices coated with two different antibody densities revealed that the displacement efficiency is a function of the density of antibody-bound labeled antigen. A higher density of antibody provides a higher amount of displaced labeled antigen, but the displacement efficiency of the assay is decreased. The effect of antibody density on the immunoassay kinetics was analyzed using a mathematical formulation developed to characterize antibody-antigen interactions at solid-liquid interfaces. Higher antibody density proved to be associated with a lower apparent dissociation rate constant. The implications of these results on the design of immunoassays in flow are discussed. C1 USN,RES LAB,CTR BIOMOLEC SCI & ENGN,WASHINGTON,DC 20375. UNIV HAMBURG,DEPT BIOCHEM & MOLEC BIOL,HAMBURG,GERMANY. HOFSTRA UNIV,DEPT ENGN,BIOENGN PROGRAM,HEMPSTEAD,NY 11550. NR 11 TC 30 Z9 30 U1 0 U2 3 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0022-1759 J9 J IMMUNOL METHODS JI J. Immunol. Methods PD FEB 10 PY 1994 VL 168 IS 2 BP 227 EP 234 DI 10.1016/0022-1759(94)90059-0 PG 8 WC Biochemical Research Methods; Immunology SC Biochemistry & Molecular Biology; Immunology GA MX059 UT WOS:A1994MX05900009 PM 8308297 ER PT J AU JULIEN, JP PAPACONSTANTOPOULOS, DA SINGH, DJ PICKETT, WE CYROTLACKMANN, F AF JULIEN, JP PAPACONSTANTOPOULOS, DA SINGH, DJ PICKETT, WE CYROTLACKMANN, F TI ELECTRONIC-STRUCTURE OF THE BAA1-XBXO3(A,B=PB,BI,SN,SB) ALLOY SYSTEMS - IMPLICATIONS FOR SUPERCONDUCTIVITY SO PHYSICA C LA English DT Article ID BAPB1-XBIXO3; BA1-XKXBIO3; BA AB Coherent potential approximation studies of the electronic structure of the BaA1-xBxO3 (where A and B are different combinations of the elements Pb, Bi, Sn and Sb) alloy systems have been performed with accurate tight-binding hamiltonians. The calculations show how semiconducting BaSnO3 evolves into a metal upon alloying with Sb or Bi. Common characteristics of the densities of states are pointed out. Using the rigid muffin-tin approximation an analysis of the superconducting properties is given. C1 USN,RES LAB,COMPLEX SYST THEORY BRANCH,WASHINGTON,DC 20375. RP JULIEN, JP (reprint author), CNRS,ETUD PROPRIETES ELECTR SOLIDES LAB,25 AVE MARTYRS,BP 166,F-38042 GRENOBLE,FRANCE. RI Singh, David/I-2416-2012 NR 21 TC 3 Z9 3 U1 0 U2 4 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0921-4534 J9 PHYSICA C JI Physica C PD FEB 10 PY 1994 VL 220 IS 3-4 BP 359 EP 366 DI 10.1016/0921-4534(94)90924-5 PG 8 WC Physics, Applied SC Physics GA MW564 UT WOS:A1994MW56400019 ER PT J AU PINTO, JF ROSENBLATT, GH ESTEROWITZ, L CASTILLO, V QUARLES, GJ AF PINTO, JF ROSENBLATT, GH ESTEROWITZ, L CASTILLO, V QUARLES, GJ TI TUNABLE SOLID-STATE LASER ACTION IN CE3+LISRALF6 SO ELECTRONICS LETTERS LA English DT Article DE LASERS; LASER TUNING AB Continuously tunable UV laser operation of cerium-doped LiSrAIF6 (Ce3+:LiSAF) between 285 and 297nm is demonstrated. At the peak operating wavelength of 290nm, output energies of 1.3 mJ with slope efficiencies of 17% have been obtained. C1 SFA INC,LANDOVER,MD 20785. LIGHTNING OPT CORP,TARPON SPRINGS,FL 34689. RP PINTO, JF (reprint author), USN,RES LAB,CODE 5641,WASHINGTON,DC 20375, USA. NR 5 TC 60 Z9 60 U1 0 U2 2 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 FEB 3 PY 1994 VL 30 IS 3 BP 240 EP 241 DI 10.1049/el:19940158 PG 2 WC Engineering, Electrical & Electronic SC Engineering GA MX971 UT WOS:A1994MX97100048 ER PT J AU LARSON, GE SACCUZZO, DP BROWN, J AF LARSON, GE SACCUZZO, DP BROWN, J TI MOTIVATION - CAUSE OR CONFOUND IN INFORMATION-PROCESSING INTELLIGENCE CORRELATIONS SO ACTA PSYCHOLOGICA LA English DT Article ID REACTION-TIME; INDIVIDUAL-DIFFERENCES; PERFORMANCE; SPEED AB The goal of the present study was to determine whether correlations between information processing scores and intelligence can be explained in terms of between-subject motivational differences. One hundred and nine male and female volunteer college students were tested on a battery of microcomputerized cognitive tests. One hundred of these subjects returned for a second session in which they were randomly assigned to an incentive or no-incentive condition and then retested. The effort expended on the tests was measured via heart rate, skin conductance, and a self-report questionnaire. Criterion measures, including the Advanced Otis-Lennon Test of Mental Abilities and Advanced Raven Progressive Matrices were also taken. The findings revealed that incentives had relatively modest effects on performance. In no case, however, did incentives affect the overall IQ-performance correlation for the tests used in the battery. These results support the view that correlations between information processing scores and intelligence reflect common mental capacities, rather than some affective variable such as motivation. C1 SAN DIEGO STATE UNIV,DOCTORAL TRAINING FACILITY,SAN DIEGO,CA 92182. RP LARSON, GE (reprint author), USN,PERSONNEL RES & DEV CTR,DEPT PERSONNEL SYST,SAN DIEGO,CA 92152, USA. NR 30 TC 15 Z9 15 U1 0 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0001-6918 J9 ACTA PSYCHOL JI Acta Psychol. PD FEB PY 1994 VL 85 IS 1 BP 25 EP 37 DI 10.1016/0001-6918(94)90018-3 PG 13 WC Psychology, Experimental SC Psychology GA NB208 UT WOS:A1994NB20800003 PM 8165922 ER PT J AU PAPARELLO, SF DAVIS, CE MALONE, JL AF PAPARELLO, SF DAVIS, CE MALONE, JL TI CUTANEOUS REACTIONS TO AMOXICILLIN-CLAVULANATE AMONG HAITIANS SO AIDS LA English DT Letter ID TRIMETHOPRIM-SULFAMETHOXAZOLE; IMMUNODEFICIENCY C1 NAVAL HOSP,DEPT PHARM,CHARLESTON,SC 29408. RP PAPARELLO, SF (reprint author), USN,NATL MED CTR,DIV INFECT DIS,BETHESDA,MD 20889, USA. NR 5 TC 0 Z9 0 U1 0 U2 0 PU RAPID SCIENCE PUBLISHERS PI LONDON PA 2-6 BOUNDARY ROW, LONDON, ENGLAND SE1 8NH SN 0269-9370 J9 AIDS JI Aids PD FEB PY 1994 VL 8 IS 2 BP 276 EP 277 DI 10.1097/00002030-199402000-00023 PG 2 WC Immunology; Infectious Diseases; Virology SC Immunology; Infectious Diseases; Virology GA NA433 UT WOS:A1994NA43300023 PM 8043237 ER PT J AU ROSEPEHRSSON, SL WYATT, JR BRENNER, KP CARVER, PT BROWN, SW THUROW, AR TRAVIS, JC AF ROSEPEHRSSON, SL WYATT, JR BRENNER, KP CARVER, PT BROWN, SW THUROW, AR TRAVIS, JC TI LABORATORY DEVELOPMENT AND FIELD-EVALUATION OF A PASSIVE SAMPLING DEVICE FOR MONOMETHYLHYDRAZINE IN AMBIENT AIR SO AMERICAN INDUSTRIAL HYGIENE ASSOCIATION JOURNAL LA English DT Article AB A passive sampling method applicable to personnel and area monitoring was developed for the quantitation of monomethylhydrazine (MMH) in ambient air at sub part-per-million levels. The method involves the use of a black, molded, low-density polyethylene sampler consisting of a diffusion barrier and a citric acid collection medium. It collects samples that can be analyzed by NIOSH colorimetric methods of a coulometric titration procedure. The sampler incorporates a two-millimeter thick diffusion barrier with 144 one-millimeter diameter holes and produces a collection rate for MMH of 27 cm(3)/min. The accuracy of data collected is within 30% of actual values under most conditions. The dosimeter has demonstrated accuracy for sampling periods of 15 min to 66 hours when sampling MMH at the threshold limit value concentration of 200 ppb. Limits of detection are dictated by the specific analytical method. Coulometric titration will detect exposures of 30 ppb-hours. Laboratory tests were conducted in controlled atmospheres to evaluate collection rate, face velocity effects, relative humidity effects, sample stability, reproducibility, linearity, and interference effects of selected chemical vapors. Field tests evaluated performance under typical conditions. Test locations were selected to provide information on probable interferents. A double-blind protocol was used involving industrial hygienists, analytical chemists, and auditors. The data obtained revealed a performance problem not encountered in the laboratory. The cause was identified and the prototype system was modified and retested. Results from the modified sampler show that it is suitable for workplace monitoring applications with two minor interferents: tobacco smoke and intense direct sunlight. C1 USN,RES LAB,WASHINGTON,DC 20375. EG&G,KENNEDY SPACE CTR,FL 32899. WILTECH CORP,KENNEDY SPACE CTR,FL 32899. NASA,KENNEDY SPACE CTR,FL 32899. GEOCENTERS INC,FT WASHINGTON,MD 20744. NR 24 TC 3 Z9 3 U1 1 U2 2 PU AMER INDUSTRIAL HYGIENE ASSOC PI FAIRFAX PA 2700 PROSPERITY AVE #250, FAIRFAX, VA 22031-4307 SN 0002-8894 J9 AM IND HYG ASSOC J JI Am. Ind. Hyg. Assoc. J. PD FEB PY 1994 VL 55 IS 2 BP 149 EP 162 DI 10.1202/0002-8894(1994)055<0149:LDAFEO>2.0.CO;2 PG 14 WC Environmental Sciences; Public, Environmental & Occupational Health SC Environmental Sciences & Ecology; Public, Environmental & Occupational Health GA MV494 UT WOS:A1994MV49400009 ER PT J AU CONSTANTINE, NT ZHANG, X LI, L BANSAL, J HYAMS, KC SMIALEK, JE AF CONSTANTINE, NT ZHANG, X LI, L BANSAL, J HYAMS, KC SMIALEK, JE TI APPLICATION OF A RAPID ASSAY FOR DETECTION OF ANTIBODIES TO HUMAN-IMMUNODEFICIENCY-VIRUS IN URINE SO AMERICAN JOURNAL OF CLINICAL PATHOLOGY LA English DT Article DE EVALUATION; HIV-1; RAPID ASSAY; URINE ID HIV-1 AB The use of rapid, simple tests to detect antibodies to human immunodeficiency virus (HIV) in urine could be valuable for several testing situations, such as in private offices, for epidemiologic surveys, and in developing countries. The authors evaluated the performance of the SUD(TM) HIV type 1 test to detect antibody to HIV-1 peptides in urine. Test performance and applicability of the SUDS test were compared with a routine Food and Drug Administration-licensed enzyme-linked immunosorbent assay (ELISA) and Western blot using 139 serum and urine pairs collected from autopsy cases. Using a modified procedure when testing urine by the SUDS test, results indicated that a total of 15 serum/urine pairs were HIV-1 antibody positive by both the SUDS test and ELISA; all could be confirmed positive by Western blot. One sample produced discrepant results. The SUDS test produced no false-positive results when testing serum or urine, as compared with ELISA, and no false-negative results when compared with the Western blot. For optimal accuracy of detection of antibodies using urine, at least 100 mu L of sample was required. By Western blot analysis, antibody profiles in urine were generally weaker than in serum, but confirmation of positivity was not compromised when larger: volumes were used. The authors concluded that this rapid HIV-1 test, when used to detect antibodies to HIV-1 in urine, is accurate, easy to perform, and appropriate for use in certain testing situations. C1 OFF CHIEF MED EXAMINER STATE MARYLAND,BALTIMORE,MD. USN,MED RES INST,ROCKVILLE,MD 20852. RP CONSTANTINE, NT (reprint author), UNIV MARYLAND,SCH MED,DEPT PATHOL,ROOM 758,10 S PINE ST,BALTIMORE,MD 21201, USA. NR 16 TC 5 Z9 5 U1 1 U2 1 PU LIPPINCOTT-RAVEN PUBL PI PHILADELPHIA PA 227 EAST WASHINGTON SQ, PHILADELPHIA, PA 19106 SN 0002-9173 J9 AM J CLIN PATHOL JI Am. J. Clin. Pathol. PD FEB PY 1994 VL 101 IS 2 BP 157 EP 161 PG 5 WC Pathology SC Pathology GA MW510 UT WOS:A1994MW51000007 PM 8116570 ER PT J AU GRIMM, IS LITYNSKI, JJ AF GRIMM, IS LITYNSKI, JJ TI SEVERE CHOLESTASIS ASSOCIATED WITH TICLOPIDINE SO AMERICAN JOURNAL OF GASTROENTEROLOGY LA English DT Note ID STROKE; PREVENTION; HEPATITIS; TRIAL C1 USN,MED CTR,DEPT INTERNAL MED,DIV GASTROENTEROL,SAN DIEGO,CA. RP GRIMM, IS (reprint author), USN,MED CTR,DEPT CLIN INVEST,SAN DIEGO,CA 92134, USA. NR 12 TC 27 Z9 27 U1 0 U2 0 PU WILLIAMS & WILKINS PI BALTIMORE PA 351 WEST CAMDEN ST, BALTIMORE, MD 21201-2436 SN 0002-9270 J9 AM J GASTROENTEROL JI Am. J. Gastroenterol. PD FEB PY 1994 VL 89 IS 2 BP 279 EP 280 PG 2 WC Gastroenterology & Hepatology SC Gastroenterology & Hepatology GA MV732 UT WOS:A1994MV73200029 PM 8304320 ER PT J AU WATSON, WJ MILLER, RC MENARD, MK CHESCHEIR, NC KATZ, VL HANSEN, WF WOLF, EJ AF WATSON, WJ MILLER, RC MENARD, MK CHESCHEIR, NC KATZ, VL HANSEN, WF WOLF, EJ TI ULTRASONOGRAPHIC MEASUREMENT OF FETAL NUCHAL SKIN TO SCREEN FOR CHROMOSOMAL-ABNORMALITIES SO AMERICAN JOURNAL OF OBSTETRICS AND GYNECOLOGY LA English DT Article DE ULTRASONOGRAPHY; FETAL NECK; DOWN SYNDROME; CHROMOSOMAL ABNORMALITIES ID DOWN-SYNDROME; FETUSES; FOLD AB OBJECTIVE: The purpose of this prospective investigation was to determine the utility of ultrasonographic measurement of the fetal nuchal skin in screening for chromosomal abnormalities. STUDY DESIGN: In 1510 patients undergoing genetic amniocentesis at 14 to 21 weeks' gestation, the fetal nuchal skin fold was measured. A measurement of greater than or equal to 6 mm was considered abnormal. RESULTS: In fetuses with normal karyotype the nuchal skin increased with advancing gestational age (r = 0.45, p < 0.001). Only 27 fetuses with normal karyotype (2.0%) had an abnormal nuchal skin thickness. Fifty-seven fetuses had abnormal karyotype. Eight of 14 fetuses with Down syndrome had abnormal ultrasonographic findings; four had increased nuchal skin as the only ultrasonographic abnormality. Increased nuchal skin alone, in the absence of other ultrasonographic dysmorphologic features, did not help to identify fetuses with other abnormal karyotypes. CONCLUSION: Nuchal skin thickness is a useful noninvasive measurement to screen for Down syndrome but does not help to identify fetuses with other chromosomal abnormalities. C1 USN,MED CTR,DEPT OBSTET & GYNECOL,BETHESDA,MD 20814. UNIV N CAROLINA,DEPT OBSTET & GYNECOL,CHAPEL HILL,NC. RP WATSON, WJ (reprint author), SIOUX VALLEY HOSP,DEPT OBSTET & GYNECOL,1201 S EUCLID AVE,SUITE 204,SIOUX FALLS,SD 57105, USA. NR 9 TC 25 Z9 27 U1 0 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 FEB PY 1994 VL 170 IS 2 BP 583 EP 586 PG 4 WC Obstetrics & Gynecology SC Obstetrics & Gynecology GA MZ738 UT WOS:A1994MZ73800024 PM 8116717 ER PT J AU SEWELL, DD JESTE, DV ATKINSON, JH HEATON, RK HESSELINK, JR WILEY, C THAL, L CHANDLER, JL GRANT, I AF SEWELL, DD JESTE, DV ATKINSON, JH HEATON, RK HESSELINK, JR WILEY, C THAL, L CHANDLER, JL GRANT, I TI HIV-ASSOCIATED PSYCHOSIS - A STUDY OF 20 CASES SO AMERICAN JOURNAL OF PSYCHIATRY LA English DT Article; Proceedings Paper CT 144th Annual Meeting of the American-Psychiatric-Association CY MAY 11-16, 1991 CL NEW ORLEANS, LA SP Amer Psychiat Assoc ID HUMAN-IMMUNODEFICIENCY-VIRUS; PSYCHIATRIC MORBIDITY; IMMUNE-DEFICIENCY; AIDS; INFECTION; SCHIZOPHRENIA; MANAGEMENT; COMPLEX; PATIENT; ONSET AB Objective: Psychosis is an uncommon but serious complication of infection with HIV. This article presents the results of a study of HIV-infected individuals with psychosis. Method: The authors evaluated 20 HIV-infected melt who had noniatrogenic new-onset psychosis without delirium, current substance abuse, or previous psychotic episodes. Clinical, neuropsychological, CSF, magnetic resonance imaging, and neuropathologic assessments were made. A comparison group consisting of 20 nonpsychotic HIV-infected men matched to the psychotic subjects with respect to age, race, years of education, and Centers for Disease Control HIV stage was also evaluated. Results: The psychotic patients differed from the nonpsychotic comparison subjects in having significantly higher rates of past stimulant and sedative/hypnotic abuse or dependence and at follow-up, a significantly higher rate of mortality. They also showed a trend toward greater global neuropsychological impairment. Conclusions: New-onset psychosis may be, at least in part, a manifestation of an HIV-associated encephalopathy. C1 UNIV CALIF SAN DIEGO,SCH MED,DEPT PSYCHIAT,SAN DIEGO,CA. UNIV CALIF SAN DIEGO,SCH MED,DEPT RADIOL,SAN DIEGO,CA. UNIV CALIF SAN DIEGO,SCH MED,DEPT NEUROSCI,SAN DIEGO,CA. UNIV CALIF SAN DIEGO,SCH MED,DEPT PATHOL,SAN DIEGO,CA. VET AFFAIRS MED CTR,PSYCHIAT SERV,SAN DIEGO,CA. VET AFFAIRS MED CTR,NEUROL SERV,SAN DIEGO,CA. USN HOSP,DEPT PSYCHIAT,SAN DIEGO,CA. RP SEWELL, DD (reprint author), VET AFFAIRS MED CTR,PSYCHIAT SERV 116A,3350 LA JOLLA VILLAGE DR,SAN DIEGO,CA 92161, USA. FU NIMH NIH HHS [NIMH MH-45294, NIMH MH-45688, NIMH MH-43298] NR 37 TC 66 Z9 70 U1 0 U2 2 PU AMER PSYCHIATRIC ASSOCIATION PI WASHINGTON PA 1400 K ST NW, WASHINGTON, DC 20005 SN 0002-953X J9 AM J PSYCHIAT JI Am. J. Psychiat. PD FEB PY 1994 VL 151 IS 2 BP 237 EP 242 PG 6 WC Psychiatry SC Psychiatry GA MV488 UT WOS:A1994MV48800015 PM 8296896 ER PT J AU JONES, TR BAIRD, JK BANGS, MJ ANNIS, BA PURNOMO BASRI, H GUNAWAN, S HARJOSUWARNO, S MCELROY, PD HOFFMAN, SL AF JONES, TR BAIRD, JK BANGS, MJ ANNIS, BA PURNOMO BASRI, H GUNAWAN, S HARJOSUWARNO, S MCELROY, PD HOFFMAN, SL TI MALARIA VACCINE STUDY SITE IN IRIAN-JAYA, INDONESIA - PLASMODIUM-FALCIPARUM INCIDENCE MEASUREMENTS AND EPIDEMIOLOGIC CONSIDERATIONS IN SAMPLE-SIZE ESTIMATION SO AMERICAN JOURNAL OF TROPICAL MEDICINE AND HYGIENE LA English DT Article AB Malaria epidemiologic and entomologic studies were performed during both the high transmission and low transmission seasons to characterize the Plasmodium falciparum malaria transmission at a proposed malaria vaccine trial site in Irian Jaya, Indonesia. The study population consisted of two subsets: native Irianese men with lifelong exposure to malaria and transmigrants who arrived from a nonmalarious area 2.5 years before the start of the study. All subjects received a radical cure for malaria and were then monitored weekly by blood film. Both P. falciparum malaria attack rates and incidence densities were calculated; transmigrants had a significantly higher rate (P = 0.003) than the Irianese during the low transmission season study (20-weeks long) but not during the high transmission season study (12-weeks long). Lack of exposure-induced immunity left the transmigrants at a minimum 17-25% greater relative risk of becoming parasitemic compared with the Irianese during the low transmission season study. During the high transmission season study, 50% of the transmigrants were P. falciparum positive by week 6 and 50% of the Irianese by week 9. During the low transmission season, 50% of the transmigrants were positive by week 10 and 43% of the Irianese were positive by week 17. Entomologic studies showed that Anopheles koliensis was the predominant vector (> 98% of anopheline catch). Entomologic inoculation rates for P. falciparum were 0.018 and 0.39 infective bites/person/night for the low and high transmission seasons, respectively. New P. vivax cases represented between 16% and 42% of all initial malaria cases. Factors affecting sample size calculation were evaluated, including causes of loss to follow-up, and sample sizes required to complete the study under several sets of conditions were calculated. The confidence intervals around specific sample sizes were calculated highlighting the need to determine the sample size based not only on predicted vaccine efficacy and estimated subject attrition but also on a desired width of confidence interval for the observed vaccine efficacy. C1 USN,MED RES UNIT 2,JAKARTA,INDONESIA. MINIST HLTH,NATL INST HLTH RES & DEV,JAKARTA,INDONESIA. PROV HLTH SERV,JAYAPURA,INDONESIA. RP JONES, TR (reprint author), USN,MED RES INST,MALARIA PROGRAM,NMRI ANNEX,12300 WASHINGTON AVE,ROCKVILLE,MD 20852, USA. NR 14 TC 28 Z9 28 U1 1 U2 1 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 FEB PY 1994 VL 50 IS 2 BP 210 EP 218 PG 9 WC Public, Environmental & Occupational Health; Tropical Medicine SC Public, Environmental & Occupational Health; Tropical Medicine GA MZ147 UT WOS:A1994MZ14700014 PM 8116815 ER PT J AU SWENSON, JD HULLANDER, RM BREADY, RJ LEIVERS, D AF SWENSON, JD HULLANDER, RM BREADY, RJ LEIVERS, D TI A COMPARISON OF PATIENT-CONTROLLED EPIDURAL ANALGESIA WITH SUFENTANIL BY THE LUMBAR VERSUS THORACIC ROUTE AFTER THORACOTOMY SO ANESTHESIA AND ANALGESIA LA English DT Article ID POSTTHORACOTOMY PAIN; FENTANYL; MORPHINE; RELIEF AB To compare the efficacy of patient-controlled lumbar and thoracic epidural sufentanil, 22 patients scheduled for elective thoracotomy were assigned randomly to receive sufentanil via either a lumbar or a thoracic epidural catheter. For 24 h postoperatively, the patients received analgesia only by patient-controlled epidural sufentanil. There were no significant differences in the visual analog scale (VAS) for pain between the two groups at 8 and 24 h postoperatively. Nausea and pruritus were minimum, requiring treatment less than once per 24-h period in either group. The forced vital capacity (FVC) measured at 24 h (as a percentage of baseline FVC) showed no significant difference between the lumbar and thoracic groups (44.7 +/- 3.8 and 41.7 +/- 5.5; P = 0.68). The total sufentanil used by the lumbar and thoracic groups was not significantly different (196 +/- 25.2 mu g and 157 +/- 28.6 mu g; P = 0.32). We conclude that there is no clinical advantage of thoracic over lumbar epidural sufentanil in the thoracotomy patient with respect to quality of analgesia, amount of sufentanil used, severity of side effects, or postoperative pulmonary function. C1 USNR,MED CTR,DEPT CLIN INVEST,SAN DIEGO,CA 92134. USN,MED CTR,DEPT ANESTHESIOL,SAN DIEGO,CA 92152. NR 13 TC 27 Z9 27 U1 0 U2 0 PU WILLIAMS & WILKINS PI BALTIMORE PA 351 WEST CAMDEN ST, BALTIMORE, MD 21201-2436 SN 0003-2999 J9 ANESTH ANALG JI Anesth. Analg. PD FEB PY 1994 VL 78 IS 2 BP 215 EP 218 DI 10.1213/00000539-199402000-00004 PG 4 WC Anesthesiology SC Anesthesiology GA NA399 UT WOS:A1994NA39900004 PM 8311271 ER PT J AU HARDERS, MS JORGENSEN, NH HULLANDER, RM LEIVERS, D AF HARDERS, MS JORGENSEN, NH HULLANDER, RM LEIVERS, D TI PATIENT SURVEY OF ANESTHETIC CHOICE - EDUCATION MAKES A DIFFERENCE SO ANESTHESIA AND ANALGESIA LA English DT Meeting Abstract C1 USN,SAN DIEGO MED CTR,DEPT ANESTHESIOL,SAN DIEGO,CA 92152. NR 3 TC 0 Z9 0 U1 0 U2 0 PU WILLIAMS & WILKINS PI BALTIMORE PA 351 WEST CAMDEN ST, BALTIMORE, MD 21201-2436 SN 0003-2999 J9 ANESTH ANALG JI Anesth. Analg. PD FEB PY 1994 VL 78 IS 2 SU S BP U89 EP U89 PG 1 WC Anesthesiology SC Anesthesiology GA NA406 UT WOS:A1994NA40600149 ER PT J AU ZIMMERMAN, AA PICKETT, MT YORK, JK HUNSAKER, DH AF ZIMMERMAN, AA PICKETT, MT YORK, JK HUNSAKER, DH TI SUPRAGLOTTIC VS SUBGLOTTIC JET VENTILATION FOR SURGERY OF THE LARYNX - THE USE OF THE MON-JET TUBE SO ANESTHESIA AND ANALGESIA LA English DT Meeting Abstract C1 USN,MED CTR,DEPT ANESTHESIOL,SAN DIEGO,CA 92152. USN,MED CTR,DEPT OTOLARYNGOL,SAN DIEGO,CA 92152. NR 2 TC 0 Z9 0 U1 0 U2 0 PU WILLIAMS & WILKINS PI BALTIMORE PA 351 WEST CAMDEN ST, BALTIMORE, MD 21201-2436 SN 0003-2999 J9 ANESTH ANALG JI Anesth. Analg. PD FEB PY 1994 VL 78 IS 2 SU S BP U264 EP U264 PG 1 WC Anesthesiology SC Anesthesiology GA NA406 UT WOS:A1994NA40600498 ER PT J AU HARLEY, EH COLLINS, MD AF HARLEY, EH COLLINS, MD TI NEUROLOGIC SEQUELAE SECONDARY TO ATLANTOAXIAL INSTABILITY IN DOWN-SYNDROME - IMPLICATIONS IN OTOLARYNGOLOGIC SURGERY SO ARCHIVES OF OTOLARYNGOLOGY-HEAD & NECK SURGERY LA English DT Article ID SPINAL-CORD COMPRESSION; DOWNS-SYNDROME; AXIAL INSTABILITY; CERVICAL-VERTEBRAE; SUBLUXATION; CHILDREN; INDIVIDUALS; BIOMECHANICS; ANOMALIES; JOINT AB Objective: A comprehensive overview of atlantoaxial instability in Down syndrome as it relates to head and neck surgery and recommendations as derived from a review of the literature. Data Sources: English-language literature: otolaryngologic problems in Down syndrome and atlantoaxial biomechanics. Data Synthesis: Children affected with Down syndrome frequently require otolaryngologic procedures such as myringotomy with ventilation tubes or adenotonsillar surgery. Atlantoaxial instability occurs in 10% to 20% of patients with Down syndrome who are at risk for atlantoaxial subluxation and subsequent complications during anesthetic induction and during positioning and manipulation associated with surgery. To identify patients who are at risk for atlantoaxial subluxation, guidelines have been adapted from the recommendations of the American Academy of Pediatrics and the Special Olympics Inc, which include preoperative neurologic assessments and cervical roentgenograms in the neutral, flexion, and extension positions. Children with an atlantodental interval of greater than 4.5 mm or with peripheral neurologic findings should have further evaluation. Conclusions: A small percentage of patients with Down syndrome are at risk for atlantoaxial instability and subluxation. All patients with Down syndrome should have a preoperative neurologic assessment screening by the operating surgeon and/or a cervical roentgenogram in the lateral, extension, and flexion positions. Any abnormality should be investigated before surgery. C1 USN HOSP,DEPT OTOLARYNGOL,SAN DIEGO,CA. DIST COLUMBIA GEN HOSP,DEPT PEDIAT,WASHINGTON,DC. RP HARLEY, EH (reprint author), USN HOSP,DEPT CLIN INVEST,SAN DIEGO,CA 92134, USA. NR 50 TC 37 Z9 39 U1 0 U2 0 PU AMER MEDICAL ASSOC PI CHICAGO PA 515 N STATE ST, CHICAGO, IL 60610 SN 0886-4470 J9 ARCH OTOLARYNGOL JI Arch. Otolaryngol. Head Neck Surg. PD FEB PY 1994 VL 120 IS 2 BP 159 EP 165 PG 7 WC Otorhinolaryngology; Surgery SC Otorhinolaryngology; Surgery GA MV877 UT WOS:A1994MV87700007 PM 8297573 ER PT J AU OLEARY, CDRM AF OLEARY, CDRM TI FALL PROGRAM OF THE AMERICAN-NEUROTOLOGY-SOCIETY SO ARCHIVES OF OTOLARYNGOLOGY-HEAD & NECK SURGERY LA English DT Editorial Material RP OLEARY, CDRM (reprint author), USN,MC,SAN DIEGO,CA, USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER MEDICAL ASSOC PI CHICAGO PA 515 N STATE ST, CHICAGO, IL 60610 SN 0886-4470 J9 ARCH OTOLARYNGOL JI Arch. Otolaryngol. Head Neck Surg. PD FEB PY 1994 VL 120 IS 2 BP 240 EP 240 PG 1 WC Otorhinolaryngology; Surgery SC Otorhinolaryngology; Surgery GA MV877 UT WOS:A1994MV87700024 ER PT J AU GEHRZ, RD WOODWARD, CE GREENHOUSE, MA STARRFIELD, S WOODEN, DH WITTEBORN, FC SANDFORD, SA ALLAMANDOLA, LJ BREGMAN, JD KLAPISCH, M AF GEHRZ, RD WOODWARD, CE GREENHOUSE, MA STARRFIELD, S WOODEN, DH WITTEBORN, FC SANDFORD, SA ALLAMANDOLA, LJ BREGMAN, JD KLAPISCH, M TI THE TEMPORAL EVOLUTION OF THE 4-14 MICRON SPECTRUM OF V1974 CYGNI (NOVA CYGNI 1992) SO ASTROPHYSICAL JOURNAL LA English DT Article DE INFRARED, STARS; NOVAE, CATACLYSMIC VARIABLES; RADIATION MECHANISMS, NONTHERMAL; STARS, ABUNDANCES; STARS, INDIVIDUAL (NOVA CYGNI 1992) ID HEAVY ELEMENT ABUNDANCES; INFRARED CORONAL LINES; VULPECULAE 1984; NEON NOVA AB We present 4-14 mu m spectra of the ONeMg nova V1974 Cygni (Nova Cygni 1992) obtained during 1992 May on the NASA Kuiper Airborne Observatory (KAO) and from the NASA 1.52 m infrared telescope at Mount Lemmon, Arizona in 1992 October/November with the HIFOGS mid-infrared spectrometer. The spectra at both epochs showed continuum emission from thermal bremstrahlung (free-free radiation) with emission lines from hydrogen and [Ne II], [Ar III], and [Ne VI]. During May, approximate to 80 days after outburst, the dominant emission lines in the mid-infrared spectra were a blend of three hydrogen lines (Pf alpha, Hu beta, H11-7) near 7.5 mu m and [Ne II] at 12.8 mu m. By October (approximate to 160 days later), the hydrogen emission had virtually disappeared, the [Ne II] 12.8 mu m line had weakened considerably, and a pronounced [Ne VI] emission line had appeared at 7.6 mu m. This behavior confirms that V1974 Cyg is similar to the prototypical slow ONeMg ''neon nova,'' Nova QU Vulpeculae (1984 No. 2). The remarkable evolution of the spectrum suggests that the ionization conditions changed drastically between 1992 May and 1992 October. We find that the ejecta of V1974 Cyg were overabundant in neon with respect to silicon by a factor of approximate to 10 relative to the solar photosphere. We present new model calculations of infrared sodium forbidden line emission from [Na III] 7.319 mu m, [Na IV] 9.039 mu m, and [Na IV] 21.29 mu m that can be compared with recent model predictions of sodium synthesis in ONeMg nova outbursts. We conclude that sodium abundances in ONeMg novae can be determined by observations of infrared coronal lines of sodium that are accessible to the Infrared Space Observatory (ISO) and instruments at the NASA IRTF. C1 UNIV WYOMING,DEPT PHYS & ASTRON,WYOMING INFRARED OBSERV,LARAMIE,WY 82071. SMITHSONIAN INST,NATL AIR & SPACE MUSEUM,ASTROPHYS LAB,WASHINGTON,DC 20560. ARIZONA STATE UNIV,DEPT PHYS & ASTRON,TEMPE,AZ 85287. NASA,AMES RES CTR,DIV SPACE SCI,MOFFETT FIELD,CA 94035. USN,RES LAB,ARTEP INC,WASHINGTON,DC 20375. RP GEHRZ, RD (reprint author), UNIV MINNESOTA,SCH PHYS & ASTRON,DEPT ASTRON,116 CHURCH ST SE,MINNEAPOLIS,MN 55455, USA. NR 40 TC 16 Z9 16 U1 0 U2 0 PU UNIV CHICAGO PRESS PI CHICAGO PA 5720 S WOODLAWN AVE, CHICAGO, IL 60637 SN 0004-637X J9 ASTROPHYS J JI Astrophys. J. PD FEB 1 PY 1994 VL 421 IS 2 BP 762 EP 770 DI 10.1086/173688 PN 1 PG 9 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA MU542 UT WOS:A1994MU54200031 ER PT J AU FELDMAN, U HIEI, E PHILLIPS, KJH BROWN, CM LANG, J AF FELDMAN, U HIEI, E PHILLIPS, KJH BROWN, CM LANG, J TI VERY IMPULSIVE SOLAR-FLARES OBSERVED WITH THE YOHKOH SPACECRAFT SO ASTROPHYSICAL JOURNAL LA English DT Article DE SUN, FLARES; SUN, X-RAYS, GAMMA RAYS ID X-RAY-SPECTRA; DIELECTRONIC SATELLITE SPECTRA; HELIUM-LIKE IONS; CRYSTAL SPECTROMETER; A MISSION; DENSITY; RATIOS; PLASMA; LINES AB Using X-ray data from two instruments aboard the Yohkoh spacecraft, launched in 1991 August to study solar high-energy phenomena, some 38 extremely impulsive flares of X-ray importance greater than C1 have been identified and studied. Electron temperatures of these flares, derived from Yohkoh Bent Crystal Spectrometer data, appear to decline immediately after the intensity maximum is attained, implying that energy input into the flaring plasma is reduced or possibly ceases after this time. Images of these flares with the high-resolution Yohkoh Soft X-ray Telescope show that, contrary to expectation if thermal conduction is a significant cooling mechanism, the emitting regions consist of tiny pointlike sources (volumes less than or equal to 3 x 10(24) cm(3)) within a loop structure. With mass loss along field lines eliminated also, from a previous study, the chief energy-loss mechanism is likely to be radiation, and if so a lower limit for the electron density of similar to 10(12) cm(-3) is imposed. This is only compatible with values of the emission measure if the flare volume is 3 x 10(24) cm(3), corresponding to a sphere of only 1790 km in diameter. C1 NATL ASTRON OBSERV JAPAN,MITAKA,TOKYO 181,JAPAN. RUTHERFORD APPLETON LAB,DIV ASTROPHYS,DIDCOT OX11 0QX,OXON,ENGLAND. RP FELDMAN, U (reprint author), USN,RES LAB,EO HULBURT CTR SPACE RES,WASHINGTON,DC 20375, USA. NR 23 TC 53 Z9 53 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 FEB 1 PY 1994 VL 421 IS 2 BP 843 EP 850 DI 10.1086/173696 PN 1 PG 8 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA MU542 UT WOS:A1994MU54200039 ER PT J AU KEENAN, FP CONLON, ES WARREN, GA PRADHAN, AK ZHANG, HL SAMPSON, DH WIDING, KG AF KEENAN, FP CONLON, ES WARREN, GA PRADHAN, AK ZHANG, HL SAMPSON, DH WIDING, KG TI NE-VI LINE RATIOS IN THE SUN SO ASTROPHYSICAL JOURNAL LA English DT Article DE ATOMIC DATA; SUN, FLARES; SUN, UV RADIATION ID ULTRAVIOLET SOLAR EMISSION; HIGHLY CHARGED IONS; B-LIKE IONS; XUV OBSERVATIONS; COMPACT FLARE; SPECTRUM; SKYLAB; DIAGNOSTICS; TRANSITIONS; ABUNDANCES AB Recent calculations of electron impact excitation rates for Ne VI are used to derive theoretical electron density sensitive emission line ratios involving transitions in the wavelength range 399-563 Angstrom. Electron densities deduced from the observed line ratios for solar flares, obtained with the Naval Research Laboratory's S082A slitless spectrograph on-board Skylab, are in excellent internal agreement and, furthermore, compare favorably with densities estimated from line ratios in O V and Ne VII, which are formed at similar electron temperatures to Ne VI. These results provide experimental support for the accuracy of the atomic data adopted in the analysis. C1 OHIO STATE UNIV,DEPT ASTRON,COLUMBUS,OH 43210. PENN STATE UNIV,DEPT ASTRON,UNIV PK,PA 16802. USN,RES LAB,EO HULBURT CTR SPACE RES,WASHINGTON,DC 20375. RP KEENAN, FP (reprint author), QUEENS UNIV BELFAST,DEPT PURE & APPL PHYS,BELFAST BT7 1NN,ANTRIM,NORTH IRELAND. NR 43 TC 4 Z9 4 U1 0 U2 0 PU UNIV CHICAGO PRESS PI CHICAGO PA 5720 S WOODLAWN AVE, CHICAGO, IL 60637 SN 0004-637X J9 ASTROPHYS J JI Astrophys. J. PD FEB 1 PY 1994 VL 421 IS 2 BP 851 EP 853 DI 10.1086/173697 PN 1 PG 3 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA MU542 UT WOS:A1994MU54200040 ER PT J AU DERMER, CD SCHLICKEISER, R AF DERMER, CD SCHLICKEISER, R TI ON THE LOCATION OF THE ACCELERATION AND EMISSION SITES IN GAMMA-RAY BLAZARS SO ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES LA English DT Article; Proceedings Paper CT International-Astronomical-Union Colloquium 142 CY JAN 11-15, 1993 CL COLL PK, MD SP INT ASTRON UNION DE ACCELERATION OF PARTICLES; BL LACERTAE OBJECTS, GENERAL; GALAXIES, JETS; GAMMA RAYS, THEORY; RADIATION MECHANISMS, NONTHERMAL ID PAIR PRODUCTION; PHOTONS AB Compton scattering of external radiation by nonthermal particles in outflowing blazar jets is dominated by accretion-disk photons rather than scattered radiation to distances similar to 0.01-0.1 pc from the central engine for standard parameters, thus clarifying the limits of validity of the model by the present authors and the model of Sikora, Begelman, & Rees. On the basis of contemporaneous Ginga X-ray and EGRET gamma-ray observations, we estimate the radius of 3C 279's gamma-ray photosphere to be smaller than estimated by Blandford. There is thus no need to require that the acceleration and emission sites of gamma-ray blazars to be located farther than similar to 10(2)-10(3) gravitational radii from the central engine. We argue that lineless BL Lac objects, rather than quasars, are more likely to be detected in the TeV energy range. C1 MAX PLANCK INST RADIOASTRON,D-53121 BONN 1,GERMANY. RP DERMER, CD (reprint author), NAVAL RES LAB,EO HULBURT CTR SPACE PHYS,CODE 7653,WASHINGTON,DC 20375, USA. NR 20 TC 102 Z9 102 U1 0 U2 1 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 FEB PY 1994 VL 90 IS 2 BP 945 EP 948 DI 10.1086/191929 PG 4 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA MT954 UT WOS:A1994MT95400062 ER PT J AU FORSTER, EM BARBER, JA PARKER, FR WHINNERY, JE BURTON, RR BOLL, P AF FORSTER, EM BARBER, JA PARKER, FR WHINNERY, JE BURTON, RR BOLL, P TI EFFECT OF PYRIDOSTIGMINE BROMIDE ON ACCELERATION TOLERANCE AND PERFORMANCE SO AVIATION SPACE AND ENVIRONMENTAL MEDICINE LA English DT Article ID GROUND-LEVEL; ALTITUDE AB Pyridostigmine Bromide (PB) is used as a pre-exposure antidote for the prevention of potentially lethal effects of certain chemical warfare nerve agents by reversibly inhibiting acetylcholinesterase (AChE). This study was designed to determine whether PB has any deleterious effects on acceleration tolerance (+Gz) or performance. Double-blind placebo trials were conducted to evaluate the effects of PB (90 mg) per day on +Gx tolerances and performance. Three types of exposures were used: 1) gradual onset rate (GOR) exposures of 0.1 G/s; 2) a series of rapid onset rate (ROR) exposures of 6.0 G/s; and 3) a simulated aerial combat maneuver (SACM) of 4.5 to 9.0 +Gz. Performance tasks included the Unified Tri-Service Cognitive Performance Assessment Battery (UTC-PAB). The subjects were not able to correlate their symptoms with PB, placebo, or the acceleration exposure itself. Plasma PB individual levels ranged between 6 and 31 ng/ml and AChE levels of inhibition had a range of 12 to 45%. There were no significant effects on +Gz tolerance or performance related to PB. Based on the results of this study, PB does not significantly alter +Gz tolerance or performance. Therefore, we do not expect aircrew taking prophylactic doses of PB to be adversely affected during aerial combat operations. C1 KRUG LIFE SCI,SAN ANTONIO,TX. ESPEY HUSTON & ASSOCIATES,BIOASSAY LAB,HOUSTON,TX. CREW SYST DIRECTORATE,ARMSTRONG LAB,BROOKS AFB,TX. RP FORSTER, EM (reprint author), USN,CTR WARFARE,DIV AIRCRAFT,CODE 6023,WARMINSTER,PA 18974, USA. NR 24 TC 5 Z9 6 U1 0 U2 0 PU AEROSPACE MEDICAL ASSOC PI ALEXANDRIA PA 320 S HENRY ST, ALEXANDRIA, VA 22314-3579 SN 0095-6562 J9 AVIAT SPACE ENVIR MD JI Aviat. Space Environ. Med. PD FEB PY 1994 VL 65 IS 2 BP 110 EP 116 PG 7 WC Public, Environmental & Occupational Health; Medicine, General & Internal; Sport Sciences SC Public, Environmental & Occupational Health; General & Internal Medicine; Sport Sciences GA MW503 UT WOS:A1994MW50300004 PM 8161320 ER PT J AU DAMODARAN, KV MERZ, KM GABER, BP AF DAMODARAN, KV MERZ, KM GABER, BP TI INTERACTION OF SMALL PEPTIDES WITH LIPID BILAYERS - MOLECULAR-DYNAMICS AND FREE-ENERGY SIMULATION STUDIES SO BIOPHYSICAL JOURNAL LA English DT Meeting Abstract C1 PENN STATE UNIV,DEPT CHEM,UNIV PK,PA 16802. USN,RES LAB,CTR BIOMOLEC SCI & ENGN,WASHINGTON,DC 20375. NR 0 TC 0 Z9 0 U1 0 U2 0 PU BIOPHYSICAL SOCIETY PI BETHESDA PA 9650 ROCKVILLE PIKE, BETHESDA, MD 20814-3998 SN 0006-3495 J9 BIOPHYS J JI Biophys. J. PD FEB PY 1994 VL 66 IS 2 BP A392 EP A392 PN 2 PG 1 WC Biophysics SC Biophysics GA MU462 UT WOS:A1994MU46202275 ER PT J AU SINGH, A MARKOWITZ, MA PURANIK, D AF SINGH, A MARKOWITZ, MA PURANIK, D TI FORMATION OF MICROSTRUCTURES WITH TORROIDAL TOPOLOGY FROM DIACETYLENIC SULPHOLIPID SO BIOPHYSICAL JOURNAL 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 BIOPHYSICAL SOCIETY PI BETHESDA PA 9650 ROCKVILLE PIKE, BETHESDA, MD 20814-3998 SN 0006-3495 J9 BIOPHYS J JI Biophys. J. PD FEB PY 1994 VL 66 IS 2 BP A176 EP A176 PN 2 PG 1 WC Biophysics SC Biophysics GA MU462 UT WOS:A1994MU46201022 ER PT J AU LY, LN TAKLE, ES AF LY, LN TAKLE, ES TI A NUMERICAL STUDY OF THE INFLUENCE OF AN AIR TEMPERATURE-INVERSION LAYER AND A SEAWATER DENSITY-JUMP LAYER ON THE STRUCTURE OF INTERACTING BOUNDARY-LAYERS SO BOUNDARY-LAYER METEOROLOGY LA English DT Article ID DYNAMICS; MODEL AB The effects of an air-temperature inversion in the atmosphere and a seawater density jump in the ocean on the structure of the atmospheric and oceanic boundary layers are studied by use of a coupled model. The numerical model consists of a closed system of equations for velocities, turbulent kinetic energy, turbulent exchange coefficient, local turbulent length scale, and stratification expressions for both air and sea boundary layers. The effects of the temperature inversion and the density jump are incorporated into the equations of turbulent kinetic energy of the atmosphere and ocean by a parameterization. A series of numerical experiments was conducted to determine the effects of various strengths of the inversion layer and surface heat fluxes in the atmosphere and of the density-jump layer in the ocean on the structure of the interacting boundary layers. The numerical results show that the temperature inversion in the atmosphere and density jump in the ocean have strong influences on turbulent structure [especially on the turbulent exchange coefficient (TEC) and turbulent kinetic energy (TKE)] and on air-sea interaction characteristics. Maxima of TKE and TEC strongly decrease with increasing strength of the inversion layer, and they disappear for strong inversions in the atmosphere. Certain strengths (density differences between the upper and the lower layers) of the density-jump layer in the ocean (DELTArho2 greater-than-or-equal-to 0.1 g/cm3) produce double maxima in TEC-profiles and TKE-profiles in the ocean. The magnitudes of air-sea interaction characteristics such as geostrophic drag coefficient, and surface drift current increase with increasing strength of the density-jump layer in the ocean. The density-jump layer plays the role of a barrier that limits vertical mixing in the ocean. The numerical results agree well with available observed data and accepted quantitive understanding of the influences of a temperature inversion layer and a density-jump layer on the interacting atmospheric and oceanic boundary layers. C1 IOWA STATE UNIV SCI & TECHNOL,DEPT EARTH & ATMOSPHER SCI,AMES,IA 50011. RP LY, LN (reprint author), NAVAL POSTGRAD SCH MONTEREY,DEPT OCEANOG,MONTEREY,CA 93943, USA. NR 22 TC 0 Z9 0 U1 0 U2 2 PU KLUWER ACADEMIC PUBL PI DORDRECHT PA SPUIBOULEVARD 50, PO BOX 17, 3300 AA DORDRECHT, NETHERLANDS SN 0006-8314 J9 BOUND-LAY METEOROL JI Bound.-Layer Meteor. PD FEB PY 1994 VL 67 IS 4 BP 327 EP 343 DI 10.1007/BF00705437 PG 17 WC Meteorology & Atmospheric Sciences SC Meteorology & Atmospheric Sciences GA NB601 UT WOS:A1994NB60100001 ER PT J AU EASWARAN, KRK BALASUBRAMANIAN, SV SINGH, A AF EASWARAN, KRK BALASUBRAMANIAN, SV SINGH, A TI CONFORMATION OF POLYMERIZABLE DIACETYLENIC LECITHIN, DC8,9PC, BY H-1-NMR SPECTROSCOPY SO CHEMISTRY AND PHYSICS OF LIPIDS LA English DT Note DE POLYMERIZABLE PHOSPHOLIPID; NUCLEAR MAGNETIC RESONANCE; CORRELATED SPECTROSCOPY; LIPID CONFORMATION; TUBULES ID PHOSPHATIDYLCHOLINES; PHOSPHOLIPIDS; TUBULES AB Diacetylenic phospholipid, 1,2 bis-(tricosa-10,12-diynoyl)-sn-glycero-3-phosphocholine (DC8,9PC), forms helices and tubules in addition to liposomes. The diacetylenic moiety responsible for the transformation is probed by 2-D NMR correlated spectroscopy. Chemical shift assignments and the analysis of 2D-COSY measurements were done on the lipid in chloroform-d solution. Based on this analysis, a model for the lipid is proposed. The geometry of the headgroup, glycerol backbone and acyl chains up to three methylenes from glycerol backbone [-(CH2)(3)-] is similar to that of dipalmitoyl phosphatidylcholine. The estimated torsional angle for methylene groups adjacent to diacetylenic moieties suggested an overall tilt of the diacetylenic lipid molecule from the bilayer axis of 25-30 degrees. This tilt could be negative or positive depending on the handedness of the resultant microstructures. C1 USN,RES LAB,CTR BIOMOLEC SCI & ENGN,WASHINGTON,DC 20375. INDIAN INST SCI,MOLEC BIOPHYS UNIT,560012 BANGALORE,INDIA. NR 16 TC 2 Z9 2 U1 0 U2 2 PU ELSEVIER SCI IRELAND LTD PI CLARE PA CUSTOMER RELATIONS MANAGER, BAY 15, SHANNON INDUSTRIAL ESTATE CO, CLARE, IRELAND SN 0009-3084 J9 CHEM PHYS LIPIDS JI Chem. Phys. Lipids PD FEB PY 1994 VL 69 IS 2 BP 161 EP 165 DI 10.1016/0009-3084(94)90037-X PG 5 WC Biochemistry & Molecular Biology; Biophysics SC Biochemistry & Molecular Biology; Biophysics GA NA613 UT WOS:A1994NA61300007 ER PT J AU WEISS, PJ WALLACE, MR AF WEISS, PJ WALLACE, MR TI AEROSOLIZED PENTAMIDINE FOR SECONDARY PROPHYLAXIS OF PNEUMOCYSTIS-CARINII PNEUMONIA - WHAT IS THE CORRECT DOSE SO CLINICAL INFECTIOUS DISEASES LA English DT Letter ID AIDS C1 USN HOSP,DEPT INTERNAL MED,DIV INFECT DIS,SAN DIEGO,CA 92134. RP WEISS, PJ (reprint author), USN HOSP,DEPT CLIN INVEST,SAN DIEGO,CA 92134, USA. NR 6 TC 0 Z9 0 U1 0 U2 0 PU UNIV CHICAGO PRESS PI CHICAGO PA 5720 S WOODLAWN AVE, CHICAGO, IL 60637 SN 1058-4838 J9 CLIN INFECT DIS JI Clin. Infect. Dis. PD FEB PY 1994 VL 18 IS 2 BP 257 EP 258 PG 2 WC Immunology; Infectious Diseases; Microbiology SC Immunology; Infectious Diseases; Microbiology GA MU350 UT WOS:A1994MU35000024 PM 8161641 ER PT J AU BENDER, BA JESSEN, TL AF BENDER, BA JESSEN, TL TI EFFECTS OF PROCESSING ON MECHANICAL-PROPERTIES AND MICROSTRUCTURE OF A CERAMIC COMPOSITE SO COMPOSITES LA English DT Article DE TYRANNO SIC FIBERS; CERAMIC COMPOSITES; PROCESSING; ZRTIO4 MATRIX; FRACTURE TOUGHNESS; CO HEAR TREATMENTS; BN-COATED FIBERS ID ORGANOMETALLIC POLYMER PRECURSOR; FIBER-REINFORCED CERAMICS; BRITTLE-MATRIX COMPOSITES; HIGH-TENSILE STRENGTH; SIC FIBERS; FRACTURE AB The effects of processing on the microstructure and mechanical behaviour of a Tyranno SiC fibre-reinforced zirconia titanate composite were evaluated. The microstructure was analysed using X-ray diffraction, scanning electron microscopy and transmission electron microscopy. Mechanical behaviour was characterized by strength and toughness measurements, which were correlated with the microstructure of the composite and its fibre/matrix interface. BN-coated fibres modified the interfacial microstructure by allowing debonding and fibre pull-out to occur. Incorporating CO-treated fibres and hot-pressing in an atmosphere of CO at an overpressure of 111.5 kPa limited fibre degradation during consolidation and resulted in improved in situ fibre strength. As a result, a strong (705 MPa) and tough (17.1 MPa m(1/2)) Tyranno SiC fibre-reinforced composite was fabricated via hot-pressing at 1270 degrees C at an applied pressure of 17.25 MPa. RP BENDER, BA (reprint author), USN,RES LAB,CERAM & COMPOSITES BRANCH,CODE 6374,WASHINGTON,DC 20375, USA. NR 35 TC 2 Z9 2 U1 1 U2 2 PU BUTTERWORTH-HEINEMANN LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, OXON, ENGLAND OX5 1GB SN 0010-4361 J9 COMPOSITES JI Composites PD FEB PY 1994 VL 25 IS 2 BP 87 EP 93 DI 10.1016/0010-4361(94)90002-7 PG 7 WC Materials Science, Composites SC Materials Science GA MR042 UT WOS:A1994MR04200002 ER PT J AU LEWIS, T AF LEWIS, T TI IS 1994 1984 ALL OVER AGAIN SO COMPUTER LA English DT Editorial Material RP LEWIS, T (reprint author), USN,POSTGRAD SCH,MONTEREY,CA 93940, USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU IEEE COMPUTER SOC PI LOS ALAMITOS PA 10662 LOS VAQUEROS CIRCLE, PO BOX 3014, LOS ALAMITOS, CA 90720-1264 SN 0018-9162 J9 COMPUTER JI Computer PD FEB PY 1994 VL 27 IS 2 BP 8 EP 8 PG 1 WC Computer Science, Hardware & Architecture; Computer Science, Software Engineering SC Computer Science GA MW359 UT WOS:A1994MW35900002 ER PT J AU BUDDENBERG, R AF BUDDENBERG, R TI NETWORKING ISSUES FOR TELEVISION SO COMPUTER LA English DT Article RP BUDDENBERG, R (reprint author), USN,POSTGRAD SCH,BLDG 330,RM 229,555 DYER RD,MONTEREY,CA 93943, USA. NR 1 TC 0 Z9 0 U1 0 U2 0 PU IEEE COMPUTER SOC PI LOS ALAMITOS PA 10662 LOS VAQUEROS CIRCLE, PO BOX 3014, LOS ALAMITOS, CA 90720-1264 SN 0018-9162 J9 COMPUTER JI Computer PD FEB PY 1994 VL 27 IS 2 BP 76 EP 78 PG 3 WC Computer Science, Hardware & Architecture; Computer Science, Software Engineering SC Computer Science GA MW359 UT WOS:A1994MW35900010 ER PT J AU DELOACHBANTA, LJ AF DELOACHBANTA, LJ TI LICHENOID DRUG ERUPTION - CRYSTAL METHAMPHETAMINE OR ADULTERANTS SO CUTIS LA English DT Article ID PLANUS AB Many drugs have been reported to produce an eruption that is clinically and histologically indistinguishable from lichen planus. I report a case of lichenoid drug eruption occurring after crystal methamphetamine abuse. To my knowledge, this is the first report of an illicit drug causing a lichenoid drug eruption. C1 USN HOSP,DEPT CLIN INVEST,SAN DIEGO,CA 92134. NR 7 TC 2 Z9 2 U1 0 U2 0 PU EXCERPTA MEDICA INC PI NEW YORK PA 245 WEST 17TH STREET, NEW YORK, NY 10011 SN 0011-4162 J9 CUTIS JI Cutis PD FEB PY 1994 VL 53 IS 2 BP 97 EP 98 PG 2 WC Dermatology SC Dermatology GA PF053 UT WOS:A1994PF05300011 PM 7851132 ER PT J AU BHARGAVA, HK KIMBROUGH, SO AF BHARGAVA, HK KIMBROUGH, SO TI EDITORS INTRODUCTION TO THE SPECIAL ISSUE ON LOGIC MODELING SO DECISION SUPPORT SYSTEMS LA English DT Editorial Material C1 UNIV MICHIGAN,SCH BUSINESS ADM,ANN ARBOR,MI 48109. RP BHARGAVA, HK (reprint author), USN,POSTGRAD SCH,MONTEREY,CA 93943, USA. NR 2 TC 1 Z9 1 U1 0 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0167-9236 J9 DECIS SUPPORT SYST JI Decis. Support Syst. PD FEB PY 1994 VL 11 IS 2 BP 101 EP 102 DI 10.1016/0167-9236(94)90027-2 PG 2 WC Computer Science, Artificial Intelligence; Computer Science, Information Systems; Operations Research & Management Science SC Computer Science; Operations Research & Management Science GA MV022 UT WOS:A1994MV02200001 ER PT J AU KOSTOFF, RN AF KOSTOFF, RN TI ASSESSING RESEARCH IMPACT - SEMIQUANTITATIVE METHODS SO EVALUATION REVIEW LA English DT Article AB Three types of semiquantitative methods used by the federal government in research impact assessment are presented. These include the classic retrospective method (Project Hindsight), another retrospective approach (Project TRACES and follow-ons) and accomplishments books used by selected research-sponsoring organizations (Office of Naval Research, Air Force Office of Scientific Research, Department of Energy Office of Health and Environmental Research, Department of Energy High Energy Physics Program Defense Advanced Research Projects Agency). The strengths and weaknesses of each approach are discussed. One goal of all the studies presented was to identify the products of research and some of their impacts. In addition, the Hindsight, the technology in retrospect and critical events in science (TRACES), and the Defense Advanced Research Projects Agency (DARPA) studies tried to identify factors that influenced the productivity and impact of research. The following general conclusions about the role and impact of basic research were reached: (1) the majority of basic research events that directly affected technologies or systems were nonmission oriented and occurred many decades before the technology or the system emerged; (2) the cumulative indirect impacts of basic research were not accounted for by any of the retrospective approaches published; (3) an advanced pool of knowledge must be developed in many fields before synthesis leading to an innovation can occur; and (4) allocation of benefits among researchers, organizations, and funding agencies to determine economic returns from basic research is very difficult and arbitrary especially at the microlevel. RP KOSTOFF, RN (reprint author), OFF NAVAL RES,ARLINGTON,VA 22217, USA. NR 16 TC 0 Z9 0 U1 2 U2 4 PU SAGE PUBLICATIONS INC PI THOUSAND OAKS PA 2455 TELLER RD, THOUSAND OAKS, CA 91320 SN 0193-841X J9 EVALUATION REV JI Eval. Rev. PD FEB PY 1994 VL 18 IS 1 BP 11 EP 19 DI 10.1177/0193841X9401800102 PG 9 WC Social Sciences, Interdisciplinary SC Social Sciences - Other Topics GA MU160 UT WOS:A1994MU16000002 ER PT J AU KOSTOFF, RN AF KOSTOFF, RN TI ASSESSING RESEARCH IMPACT - FEDERAL PEER-REVIEW PRACTICES SO EVALUATION REVIEW LA English DT Article AB This article describes the use of peer review for federal research impact evaluation. For selected agencies, it covers peer review practices for proposed and existing programs. It shows that nearer-term research impacts typically play a more important role in the review outcome than longer-term impacts; however; they do not have quite the importance of team quality, research approach or the research merit. Although advanced review processes can improve the efficiency of a review, three of the most important intangible factors for a high-quality peer review are motivation of the review leader and competence and independence of the review team members. Although peer review in its broadest sense is the most widely used method in research selection, review, and ex post assessment, it has its deficiencies, and there is no single method that provides a complete impact evaluation The use of quantitative techniques such as bibliometrics to supplement peer review is an area ripe for exploitation RP KOSTOFF, RN (reprint author), OFF NAVAL RES, ARLINGTON, VA 22217 USA. NR 17 TC 12 Z9 12 U1 1 U2 3 PU SAGE PUBLICATIONS INC PI THOUSAND OAKS PA 2455 TELLER RD, THOUSAND OAKS, CA 91320 USA SN 0193-841X J9 EVALUATION REV JI Eval. Rev. PD FEB PY 1994 VL 18 IS 1 BP 31 EP 40 DI 10.1177/0193841X9401800104 PG 10 WC Social Sciences, Interdisciplinary SC Social Sciences - Other Topics GA MU160 UT WOS:A1994MU16000004 ER PT J AU XU, LC STAHL, SK DAVE, HPG SCHIFFMANN, R CORRELL, PH KESSLER, S KARLSSON, S AF XU, LC STAHL, SK DAVE, HPG SCHIFFMANN, R CORRELL, PH KESSLER, S KARLSSON, S TI CORRECTION OF THE ENZYME DEFICIENCY IN HEMATOPOIETIC-CELLS OF GAUCHER PATIENTS USING A CLINICALLY ACCEPTABLE RETROVIRAL SUPERNATANT TRANSDUCTION PROTOCOL SO EXPERIMENTAL HEMATOLOGY LA English DT Note DE GC DEFICIENCY; GENE THERAPY; GAUCHER DISEASE; RETROVIRAL SUPERNATANT; TRANSDUCTION ID MEDIATED GENE-TRANSFER; BONE-MARROW TRANSPLANTATION; HUMAN GLUCOCEREBROSIDASE GENE; TERM RECONSTITUTED MICE; STEM-CELLS; PROGENITOR CELLS; HOST RANGES; EXPRESSION; DISEASE; VECTOR AB Gaucher disease is a lysosomal storage disorder caused by a deficiency of the enzyme glucocerebrosidase (GC), and is an excellent candidate for gene replacement therapy. To develop a clinically acceptable protocol for this purpose, we created two amplified (A) high-titer retroviral vector-producer cell lines to efficiently transduce hematopoietic stem and progenitor cells. GP+envAm12/A-LGSN (A-LGSN), contained the GC cDNA driven by the retroviral long terminal repeat (LTR) and the neomycin phosphotransferase gene expressed from the simian virus 40 early promoter. GP+envAm12/A-LG4 (A-LG4) contained only the GC gene driven by the LTR. Both A-LGSN and A-LG4 contained multiple proviral copies and gave approximately 10-fold higher titers on 3T3 cells compared to their unamplified counterparts. These vectors were packaged in GP+envAm12 cells because vectors produced in this cell line transduced hematopoietic cells more efficiently than other packaging cells tested. Bone marrow mononuclear cells and purified CD34(+) cells were infected with virus supernatants four times in the presence of interleukin-3 (IL-3), IL-6, and stem cell factor (SCF) over 96 hours in culture. Cells were then plated in semisolid cultures and colony-forming unit-granulocyte/macrophage (CFU-GM) colonies were scored for vector presence by polymerase chain reaction (PCR). Transduction efficiency of CFU-GM colonies derived from CD34(+) cells was improved considerably using the amplified vectors in the GP+envAm12 packaging line. For A-LGSN, A-LG4, and unamplified LGSN, transduction efficiencies were 41, 42, and 25%, respectively. Therefore, multiple proviral copies resulting in higher titer improves retroviral transduction of human hematopoietic progenitor cells. Hematopoietic cells from Gaucher patients were transduced and placed into long-term bone marrow culture (LTBMC). Viral supernatant from the amplified producer lines transduced long-term culture initiating cells (LTCIC) efficiently (30 to 50%) using this clinically acceptable protocol. Both sustained mRNA expression and GC enzyme production are achieved in the long-term culture of LTCIC and lead to correction of the GC deficiency in their progeny cells. C1 USN,MED RES INST,IMMUNE CELL BIOL PROGRAM,BETHESDA,MD. RP XU, LC (reprint author), NINCDS,DEV & METAB NEUROL BRANCH,MOLEC & MED GENET SECT,BLDG 10,ROOM 3D04,BETHESDA,MD 20892, USA. NR 47 TC 59 Z9 60 U1 0 U2 0 PU CARDEN JENNINGS PUBL CO LTD PI CHARLOTTESVILLE PA BLAKE CTR, STE 200, 1224 W MAIN ST, CHARLOTTESVILLE, VA 22903 SN 0301-472X J9 EXP HEMATOL JI Exp. Hematol. PD FEB PY 1994 VL 22 IS 2 BP 223 EP 230 PG 8 WC Hematology; Medicine, Research & Experimental SC Hematology; Research & Experimental Medicine GA MW621 UT WOS:A1994MW62100021 PM 8299741 ER PT J AU PETERSON, DA ZILBERFARB, JL GREENE, MA COLGROVE, RC AF PETERSON, DA ZILBERFARB, JL GREENE, MA COLGROVE, RC TI AVASCULAR NECROSIS OF THE 1ST METATARSAL HEAD - INCIDENCE IN DISTAL OSTEOTOMY COMBINED WITH LATERAL SOFT-TISSUE RELEASE SO FOOT & ANKLE LA English DT Article AB The incidence of avascular necrosis of the metatarsal head following distal first metatarsal osteotomy combined with adductor tendon. release has not been documented in a large series of patients. Of 82 consecutive procedures in 64 patients performed between 1986 and 1988, 42 patients (58 procedures) were available for clinical and radiographic examination. Average follow-up was 2.5 years (range 1.0-4.2 years). There were 35 L-shaped and 23 chevron osteotomies which were combined with a lateral soft tissue release that included adductor tenotomy. Preoperative hallux valgus angle averaged 25-degrees (range 15-40-degrees), and intermetatarsal angle averaged 12-degrees (range 5-24-degrees). Follow-up amount of correction averaged 13-degrees and 5-degrees, respectively. Eighty-four percent of patients were satisfied with their result. There was one case of avascular necrosis. The patient was asymptomatic at 4.2 years' follow-up, and the remaining patients included two with infections, one hallux varus, and no nonunions. RP PETERSON, DA (reprint author), USN,REG MED CTR,DEPT CLIN INVEST,SAN DIEGO,CA 92134, USA. NR 0 TC 39 Z9 39 U1 0 U2 1 PU WILLIAMS & WILKINS PI BALTIMORE PA 351 WEST CAMDEN ST, BALTIMORE, MD 21201-2436 SN 0198-0211 J9 FOOT ANKLE PD FEB PY 1994 VL 15 IS 2 BP 59 EP 63 PG 5 WC Orthopedics SC Orthopedics GA NA431 UT WOS:A1994NA43100001 PM 7981801 ER PT J AU DOGGETT, LE SCHAEFFER, BE AF DOGGETT, LE SCHAEFFER, BE TI LUNAR CRESCENT VISIBILITY SO ICARUS LA English DT Article ID LENGTH AB We report the results of five Moonwatches, in which more than 2000 observers throughout North America attempted to sight the thin lunar crescent. For each Moonwatch we were able to determine the position of the Lunar Date Line (LDL), the line along which a normal observer has a 50% probability of spotting the Moon. The observational LDLs were then compared with predicted LDLs derived from crescent visibility prediction algorithms. We find that ancient and medieval rules are highly unreliable. More recent empirical criteria, based on the relative altitude and azimuth of the Moon at the time of sunset, have a reasonable accuracy, with the best specific formulation being due to Yallop. The modem theoretical model by Schaefer (based on the physiology of the human eye and the lor-al observing conditions) is found to have the least systematic error, the least average error, and the least maximum error of all models tested. Analysis of the observations also provided information about atmospheric, optical and human factors that affect the observations. We show that observational lunar calendars have a natural bias to begin early. (C) 1994 Academic Press, Inc. C1 NASA,GODDARD SPACE FLIGHT CTR,GREENBELT,MD 20771. RP DOGGETT, LE (reprint author), USN OBSERV,NAUT ALMANAC OFF,WASHINGTON,DC 20392, USA. NR 52 TC 22 Z9 22 U1 0 U2 0 PU ACADEMIC PRESS INC JNL-COMP SUBSCRIPTIONS PI SAN DIEGO PA 525 B ST, STE 1900, SAN DIEGO, CA 92101-4495 SN 0019-1035 J9 ICARUS JI Icarus PD FEB PY 1994 VL 107 IS 2 BP 388 EP 403 DI 10.1006/icar.1994.1031 PG 16 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA NJ192 UT WOS:A1994NJ19200012 ER PT J AU BASHKANSKY, M REINTJES, J AF BASHKANSKY, M REINTJES, J TI IMAGE UP-CONVERSION USING COHERENT ANTI-STOKES-RAMAN SCATTERING SO IEEE JOURNAL OF QUANTUM ELECTRONICS LA English DT Article ID LASER; GENERATION; GAIN AB We report an experimental and theoretical study of real-time image upconversion with coherent anti-Stokes Raman scattering. Experimental results for image upconversion in hydrogen are presented. Various parameters affecting the efficiency of the upconverted signal and image resolution are discussed. RP BASHKANSKY, M (reprint author), USN,RES LAB,LASER PHYS BRANCH,CODE 5640,WASHINGTON,DC 20375, USA. NR 25 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 0018-9197 J9 IEEE J QUANTUM ELECT JI IEEE J. Quantum Electron. PD FEB PY 1994 VL 30 IS 2 BP 318 EP 328 DI 10.1109/3.283776 PG 11 WC Engineering, Electrical & Electronic; Optics; Physics, Applied SC Engineering; Optics; Physics GA NL693 UT WOS:A1994NL69300015 ER PT J AU HALL, DC SURETTE, MR GOLDBERG, L MEHUYS, D AF HALL, DC SURETTE, MR GOLDBERG, L MEHUYS, D TI CARRIER-INDUCED LENSING IN BROAD-AREA AND TAPERED SEMICONDUCTOR AMPLIFIERS SO IEEE PHOTONICS TECHNOLOGY LETTERS LA English DT Article ID HIGH-POWER; DIODE AB Wavefront lensing due to nonuniform carrier saturation in rectangular (broad-area) and tapered GaAlAs amplifiers is described. Lensing dependence on current and input power, measured interferometrically and by a lens displacement method, agree with calculations based on a beam propagation model. Lensing induced astigmatism, calculated for a representative optical focusing system, exhibited minimal variation of less than 0.3 mum/A under saturated high power conditions in both amplifier types. C1 SDL INC,SAN JOSE,CA 95134. RP HALL, DC (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 7 TC 2 Z9 2 U1 1 U2 2 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 1041-1135 J9 IEEE PHOTONIC TECH L JI IEEE Photonics Technol. Lett. PD FEB PY 1994 VL 6 IS 2 BP 186 EP 188 DI 10.1109/68.275423 PG 3 WC Engineering, Electrical & Electronic; Optics; Physics, Applied SC Engineering; Optics; Physics GA ND865 UT WOS:A1994ND86500019 ER PT J AU BURNS, WK MCELHANON, W GOLDBERG, L AF BURNS, WK MCELHANON, W GOLDBERG, L TI 2ND-HARMONIC GENERATION IN-FIELD POLED, QUASI-PHASE-MATCHED, BULK LINBO(3) SO IEEE PHOTONICS TECHNOLOGY LETTERS LA English DT Article ID 2ND-HARMONIC GENERATION; WAVE-GUIDE; FABRICATION AB Field induced periodic poling is used to create >10 micron period structures in approximately 250 micron thick slabs of LiNbO3. Third order quasi-phase-matched second harmonic blue light generation is demonstrated by free propagation of a 937 nm fundamental Gaussian beam in periodically poled LiNbO3, with a conversion efficiency of 0.2% / W cm. C1 MARYLAND ADV DEV LAB,GREENBELT,MD 20770. RP BURNS, WK (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 11 TC 69 Z9 69 U1 1 U2 2 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 1041-1135 J9 IEEE PHOTONIC TECH L JI IEEE Photonics Technol. Lett. PD FEB PY 1994 VL 6 IS 2 BP 252 EP 254 DI 10.1109/68.275441 PG 3 WC Engineering, Electrical & Electronic; Optics; Physics, Applied SC Engineering; Optics; Physics GA ND865 UT WOS:A1994ND86500038 ER PT J AU CLEMENT, WI KNOWLES, KA AF CLEMENT, WI KNOWLES, KA TI AN INSTRUCTIONAL ROBOTICS AND MACHINE VISION LABORATORY SO IEEE TRANSACTIONS ON EDUCATION LA English DT Article AB The U.S. Naval Academy has assembled a laboratory consisting of 16 identical stations in support of several robotics and machine vision courses. Each station has an 80386-based microcomputer, a five degree-of-freedom robot arm, a video-rate vision system, and a speech synthesis system. The robot arms are capable of teach-pendant operation or control via the attached computer. Programs written in the robot control language can be downloaded into, stored in, and run from robot RAM. For greater flexibility, move instructions can be generated by the controlling computer (in any desired computer language) and transmitted to the arm for execution via an RS-232 link. Each joint of the robot (plus the gripper) has a dedicated microprocessor for closed-loop servo operation utilizing incremental drive-motor shaft encoders and micro-switches for ''home'' locations. The vision system includes an RS 170-compatible video camera, a PC-compatible frame grabber board, and a video monitor. This configuration permits the utilization of 2D and 3D vision feedback in the robot control process. The laboratory is used in support of undergraduate courses that cover such topics as robot kinematics and task planning, elementary machine vision, and artificial neural networks. RP CLEMENT, WI (reprint author), USN ACAD,DEPT WEAPONS & SYST ENGN,ANNAPOLIS,MD 21402, USA. NR 4 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 0018-9359 J9 IEEE T EDUC JI IEEE Trans. Educ. PD FEB PY 1994 VL 37 IS 1 BP 87 EP 90 DI 10.1109/13.275184 PG 4 WC Education, Scientific Disciplines; Engineering, Electrical & Electronic SC Education & Educational Research; Engineering GA MZ336 UT WOS:A1994MZ33600018 ER PT J AU MOON, TK BUDGE, SE STIRLING, WC THOMPSON, JB AF MOON, TK BUDGE, SE STIRLING, WC THOMPSON, JB TI EPISTEMIC DECISION-THEORY APPLIED TO MULTIPLE-TARGET TRACKING SO IEEE TRANSACTIONS ON SYSTEMS MAN AND CYBERNETICS LA English DT Article ID MULTITARGET TRACKING AB A decision philosophy that seeks the avoidance of error by trading off belief of truth and value of information is applied to the problem of recognizing tracks from multiple targets (MTT). A successful MTT methodology should be robust in that its performance degrades gracefully as the conditions of the collection become less favorable to optimal operation. By stressing the avoidance, rather than the explicit minimization, of error, we obtain a decision rule for trajectory-data association that does not require the resolution of all conflicting hypotheses when the database does not contain sufficient information to do so reliably. This rule, coupled with a set-valued Kalman filter for trajectory estimation, results in a methodology that does not attempt to extract more information from the database than it contains. C1 BRIGHAM YOUNG UNIV,DEPT ELECT & COMP ENGN,PROVO,UT 84602. USN,CTR OCEAN SYST,SAN DIEGO,CA 92132. RP MOON, TK (reprint author), UTAH STATE UNIV,DEPT ELECT ENGN,LOGAN,UT 84322, USA. NR 14 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 0018-9472 J9 IEEE T SYST MAN CYB JI IEEE Trans. Syst. Man Cybern. PD FEB PY 1994 VL 24 IS 2 BP 234 EP 245 DI 10.1109/21.281423 PG 12 WC Computer Science, Cybernetics; Engineering, Electrical & Electronic SC Computer Science; Engineering GA ND334 UT WOS:A1994ND33400006 ER PT J AU GUERRY, P POPE, PM BURR, DH LEIFER, J JOSEPH, SW BOURGEOIS, AL AF GUERRY, P POPE, PM BURR, DH LEIFER, J JOSEPH, SW BOURGEOIS, AL TI DEVELOPMENT AND CHARACTERIZATION OF RECA MUTANTS OF CAMPYLOBACTER-JEJUNI FOR INCLUSION IN ATTENUATED VACCINES SO INFECTION AND IMMUNITY LA English DT Article ID MOLECULAR-CLONING; ESCHERICHIA-COLI; NUCLEOTIDE-SEQUENCE; FLAGELLIN GENES; VIBRIO-CHOLERAE; ANTIGENIC VARIATION; EXPRESSION; ENTERITIS; STRAIN; COLONIZATION AB Isogenic recA mutants of Campylobacter jejuni have been constructed for evaluation of their usefulness in attenuated vaccines against this major worldwide cause of diarrhea. The recA(+) gene of C. jejuni 81-176 was cloned by using degenerate primers to conserved regions of other RecA proteins in a PCR. The C. jejuni recA(+) gene encodes a predicted protein with an M, of 37,012 with high sequence similarity to other RecA proteins. The termination codon of the recA(+) gene overlaps with the initiation codon of another open reading frame which encodes a predicted protein which has >50% identity with the N terminus of the Escherichia coli enolase protein. A kanamycin resistance gene was inserted into the cloned vecA(+) gene in E. coli and returned to C. jejuni VC83 by natural transformation, resulting in allelic replacement of the wild-type recA gene. The resulting VC83 recA mutant displayed increased sensitivity to W light and a defect in generalized recombination as determined by natural transformation frequencies. The mutated recA gene was amplified from VC83 recA by PCR, and the product was used to transfer the mutation by natural transformation into C. jejuni 81-176 and 81-116, resulting in isogenic recA mutants with phenotypes similar to VC83 recA. After oral feeding, strain 81-176 recA colonized rabbits at levels comparable to wild-type 81-176 and was capable of eliciting the same degree of protection as wild-type 81-176 against subsequent homologous challenge in the RITARD (removable intestinal tie adult rabbit diarrhea) model. C1 UNIV MARYLAND,DEPT MICROBIOL,COLL PK,MD 20742. US FDA,WASHINGTON,DC 20204. RP GUERRY, P (reprint author), USN,MED RES INST,ENTER PROGRAM,12300 WASHINGTON AVE,ROCKVILLE,MD 20852, USA. NR 56 TC 40 Z9 45 U1 0 U2 1 PU AMER SOC MICROBIOLOGY PI WASHINGTON PA 1325 MASSACHUSETTS AVENUE, NW, WASHINGTON, DC 20005-4171 SN 0019-9567 J9 INFECT IMMUN JI Infect. Immun. PD FEB PY 1994 VL 62 IS 2 BP 426 EP 432 PG 7 WC Immunology; Infectious Diseases SC Immunology; Infectious Diseases GA MR841 UT WOS:A1994MR84100014 PM 8300203 ER PT J AU PFLIEGER, KL TREIBER, FA DAVIS, H MCCAFFREY, FM RAUNIKAR, RA STRONG, WB AF PFLIEGER, KL TREIBER, FA DAVIS, H MCCAFFREY, FM RAUNIKAR, RA STRONG, WB TI THE EFFECT OF ADIPOSITY ON CHILDRENS LEFT-VENTRICULAR MASS AND GEOMETRY AND HEMODYNAMIC-RESPONSES TO STRESS SO INTERNATIONAL JOURNAL OF OBESITY LA English DT Article DE ADIPOSITY; CARDIOVASCULAR RESPONSE; STRESS; LEFT VENTRICULAR MASS; SYSTOLIC FUNCTION; CHILDHOOD ID BLOOD-PRESSURE RESPONSE; M-MODE ECHOCARDIOGRAPHY; CARDIOVASCULAR REACTIVITY; RISK-FACTORS; ESSENTIAL-HYPERTENSION; HEALTHY-CHILDREN; CARDIAC-OUTPUT; ADULTS; HYPERTROPHY; ADOLESCENTS AB This study evaluated the relationship between adiposity, left ventricular mass and geometry, and haemodynamic parameters at rest and during laboratory stressors in a sample of 69 normotensive children with positive family histories of essential hypertension. Children were classified as overweight if they were above the 85th percentile of weight-for-height for their age and gender compared to national normative data. Nineteen children (7 whites, 12 blacks) were classified as overweight and the remaining 50 (26 whites, 24 blacks) were not overweight. Overweight children were found to have higher resting systolic and diastolic blood pressures, heart rates (HR), cardiac output (CO) and stroke volumes (SV), and lower resting total peripheral resistance than the non-overweight children. No differences were noted in haemodynamic reactivity to the stressors. Echocardiographic findings indicated that the overweight children had greater left ventricular mass indexed by height(2.7), interventricular septal thickness and left ventricular end diastolic diameter (LVEDD) compared to non-overweight children. These findings are the first to indicate that the higher resting pressures of overweight normotensive children are a reflection of increased preload (i.e. greater HR, SV, CO, LVEDD). These findings point out the early deleterious effects of obesity on the cardiovascular system in the young and highlight the need for effective obesity prevention and intervention programmes. C1 MED COLL GEORGIA,GEORGIA INST PREVENT HUMAN DIS & ACCIDENTS,AUGUSTA,GA 30912. CHILDRENS MED CTR,DIV CARDIOL,DALLAS,TX. MED COLL GEORGIA,DEPT PEDIAT,AUGUSTA,GA 30912. MED COLL GEORGIA,DEPT PSYCHIAT,AUGUSTA,GA. MED COLL GEORGIA,OFF BIOSTAT,AUGUSTA,GA. USN,PORTSMOUTH HOSP,PEDIAT SPECIALTY CLIN,PORTSMOUTH,VA. FU NHLBI NIH HHS [HL 41781] NR 48 TC 28 Z9 28 U1 0 U2 0 PU STOCKTON PRESS PI BASINGSTOKE PA HOUNDMILLS, BASINGSTOKE, HAMPSHIRE, ENGLAND RG21 6XS SN 0307-0565 J9 INT J OBESITY JI Int. J. Obes. PD FEB PY 1994 VL 18 IS 2 BP 117 EP 122 PG 6 WC Endocrinology & Metabolism; Nutrition & Dietetics SC Endocrinology & Metabolism; Nutrition & Dietetics GA MV045 UT WOS:A1994MV04500008 PM 8148925 ER PT J AU KARLE, IL RANGANATHAN, D SHAH, K VAISH, NK AF KARLE, IL RANGANATHAN, D SHAH, K VAISH, NK TI CONFORMATION OF THE OXALAMIDE GROUP IN RETRO-BISPEPTIDES - 3 CRYSTAL-STRUCTURES SO INTERNATIONAL JOURNAL OF PEPTIDE AND PROTEIN RESEARCH LA English DT Article DE MEO-AIB-CO-CO-AIB-OME; MEO-LEU-CO-CO-LEU-OME; MEO-PRO-CO-CO-PRO-OME; TWISTED OXALAMIDE; X-RAY DIFFRACTION ID SPONGE THEONELLA SP; AMMONIUM OXALOHYDROXAMATE; IMMUNOPHILINS; RAPAMYCIN; PEPTIDE; FK506; ACID AB We have determined the structures of a range of peptides having the oxalamide (-NH-CO-CO-NH-) unit located at their center. The oxalamide group has the trans conformation in two retropeptides and an approximately orthogonal conformation in the peptide with Pro residues. Torsional angles about the CO-CO bond are 180 degrees in MeO-Aib-CO-CO-Aib-OMe (1), 175 degrees in MeO-L-Leu-CO-CO-L-Leu-OMe (2), and -108 and -106 degrees for the two independent molecules in the crystal of MeO-L-Pro-CO-CO-L-Pro-OMe (3), owing to steric hindrance between CO and the pyrolidine ring. Crystal data are: (1) C12H20N2O6, triclinic, space group P-1, a = 6.190(1), b = 10.044(2), c = 11.989(2)Angstrom, alpha = 86.38(2), beta = 83.13(2), gamma = 80.16(2)degrees, R = 0.057 for 1646 observed reflections [\F-o\>3 sigma(\F-o\)]; (2) C(16)H(28)N2O(6), tetragonal, space group P4(1), a = b = 11.121(3), c = 15.775(6)Angstrom, R = 0.058 for 1216 observed reflections [\F-o\ > 3 sigma(\F-o\)]; (3) C14H20N2O6, monoclinic space group P2(1), a = 9.556(2), b = 17.864(3), c = 9.618(2)Angstrom, beta = 104.35(1)degrees; R = 0.051 for 2100 observed reflections[\F-o\ > 3 sigma(\F-o\)]. (C) Munksgaard 1994. C1 INDIAN INST TECHNOL,DEPT CHEM,KANPUR 208016,UTTAR PRADESH,INDIA. RP KARLE, IL (reprint author), USN,RES LAB,STRUCT MATTER LAB,WASHINGTON,DC 20375, USA. FU NIGMS NIH HHS [GM30302] NR 24 TC 28 Z9 28 U1 0 U2 2 PU MUNKSGAARD INT PUBL LTD PI COPENHAGEN PA 35 NORRE SOGADE, PO BOX 2148, DK-1016 COPENHAGEN, DENMARK SN 0367-8377 J9 INT J PEPT PROT RES JI Int. J. Pept. Protein Res. PD FEB PY 1994 VL 43 IS 2 BP 160 EP 165 PG 6 WC Biochemistry & Molecular Biology SC Biochemistry & Molecular Biology GA MW886 UT WOS:A1994MW88600007 PM 8200734 ER PT J AU RODGERS, EB CHANG, SW PIERCE, HF AF RODGERS, EB CHANG, SW PIERCE, HF TI A SATELLITE OBSERVATIONAL AND NUMERICAL STUDY OF PRECIPITATION CHARACTERISTICS IN WESTERN NORTH-ATLANTIC TROPICAL CYCLONES SO JOURNAL OF APPLIED METEOROLOGY LA English DT Article ID RAINFALL; MODEL; HURRICANES; SIMULATION; EVOLUTION; HEAT AB Special Sensor Microwave/Imager (SSM/I) observations were used to examine the spatial and temporal changes of the precipitation characteristics of tropical cyclones. SSM/I observations were also combined with the results of a tropical cyclone numerical model to examine the role of inner-core diabatic heating in subsequent intensity changes of tropical cyclones. Included in the SSM/I observations were rainfall characteristics of 18 named western North Atlantic tropical cyclones between 1987 and 1989. The SSM/I rain-rate algorithm that employed the 85-GHz channel provided an analysis of the rain-rate distribution in greater detail. However, the SSM/1 algorithm underestimated the rain rates when compared to in situ techniques but appeared to be comparable to the rain rates obtained from other satellite-borne passive microwave radiometers. The analysis of SSM/I observations found that more intense systems had higher rain rates, more latent heat release, and a greater contribution from heavier rain to the total tropical cyclone rainfall. In addition, regions with the heaviest rain rates were found near the center of the most intense tropical cyclones. Observational analysis from SSM/I also revealed that the greatest rain rates in the inner-core regions were found in the right half of fast-moving tropical cyclones, while the heaviest rain rates in slow-moving tropical cyclones were found in the forward half. The combination of SSM/I observations and an interpretation of numerical model simulations revealed that the correlation between changes in the inner core diabatic heating and the subsequent intensity became greater as the tropical cyclones became more intense. C1 USN,RES LAB,WASHINGTON,DC 20375. SCI SYST & APPLICAT INC,LANHAM,MD. RP RODGERS, EB (reprint author), NASA,GODDARD SPACE FLIGHT CTR,ATMOSPHERES LAB,MESOSCALE DYNAM & PRECIPITAT BRANCH,CODE 912,GREENBELT,MD 20771, USA. NR 48 TC 44 Z9 49 U1 1 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 FEB PY 1994 VL 33 IS 2 BP 129 EP 139 DI 10.1175/1520-0450(1994)033<0129:ASOANS>2.0.CO;2 PG 11 WC Meteorology & Atmospheric Sciences SC Meteorology & Atmospheric Sciences GA MW750 UT WOS:A1994MW75000001 ER PT J AU WILLIAMS, CM CHRISEY, DB LUBITZ, P GRABOWSKI, KS COTELL, CM AF WILLIAMS, CM CHRISEY, DB LUBITZ, P GRABOWSKI, KS COTELL, CM TI THE MAGNETIC AND STRUCTURAL-PROPERTIES OF PULSED-LASER DEPOSITED EPITAXIAL MNZN-FERRITE FILMS SO JOURNAL OF APPLIED PHYSICS LA English DT Article ID THIN-FILMS; ZINC FERRITE; SUPERCONDUCTIVITY; VAPORIZATION AB The magnetic and structural properties of pulsed laser deposited MnZn-ferrite films have been examined. The results show that the uniaxial anisotropy, ferromagnetic resonance linewidth and coercive force are strongly influenced by the microstructure of the films, and the saturation magnetization and first-order magnetocrystalline anisotropy constant depend on intrinsic properties such as composition and cation site occupation. A comparison of bulk and film magnetic properties shows that the magnetic properties of the films are comparable to the bulk, which makes pulsed laser deposition ferrite films a prime candidate for thin film high-frequency microwave device applications. C1 USN,RES LAB,WASHINGTON,DC 20375. OI Grabowski, Kenneth/0000-0003-0816-001X NR 18 TC 87 Z9 90 U1 0 U2 21 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 1 PY 1994 VL 75 IS 3 BP 1676 EP 1680 DI 10.1063/1.356353 PG 5 WC Physics, Applied SC Physics GA MW522 UT WOS:A1994MW52200060 ER PT J AU THOMS, BD PEHRSSON, PE BUTLER, JE AF THOMS, BD PEHRSSON, PE BUTLER, JE TI A VIBRATIONAL STUDY OF THE ADSORPTION AND DESORPTION OF HYDROGEN ON POLYCRYSTALLINE DIAMOND SO JOURNAL OF APPLIED PHYSICS LA English DT Article ID ENERGY-LOSS SPECTROSCOPY; CHEMICAL VAPOR-DEPOSITION; 111 SURFACE; CHAIN MODEL; FILMS; SPECTRA AB The adsorption and desorption of hydrogen from diamond films were studied in ultrahigh vacuum using high resolution electron energy loss spectroscopy as a probe of surface vibrations. Auger electron and energy loss spectroscopies were also used to characterize the diamond surface. The samples studied were: boron-doped polycrystalline diamond films with chiefly (111) oriented facets. We attribute the observed spectral features to a monohydride species and local sp(3) bonding on the diamond surface exposed to atomic hydrogen. A significant fraction of the hydrogen desorbs from the surface between 950 and 1000 degrees C, although some hydrogen persists even after heating to 1050 degrees C. RP THOMS, BD (reprint author), USN,RES LAB,DIV CHEM,CODE 6174,WASHINGTON,DC 20375, USA. RI Butler, James/B-7965-2008 OI Butler, James/0000-0002-4794-7176 NR 56 TC 69 Z9 69 U1 0 U2 5 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0021-8979 J9 J APPL PHYS JI J. Appl. Phys. PD FEB 1 PY 1994 VL 75 IS 3 BP 1804 EP 1810 DI 10.1063/1.356373 PG 7 WC Physics, Applied SC Physics GA MW522 UT WOS:A1994MW52200080 ER PT J AU SU, MY TODOROFF, D CARTMILL, J AF SU, MY TODOROFF, D CARTMILL, J TI LABORATORY COMPARISONS OF ACOUSTIC AND OPTICAL SENSORS FOR MICROBUBBLE MEASUREMENT SO JOURNAL OF ATMOSPHERIC AND OCEANIC TECHNOLOGY LA English DT Article AB This paper presents the results of a recent comparison between three microbubble size spectrum measurement systems. These systems are the light-scattering bubble counter, the photographic bubble-imaging system, and the acoustic resonator array. Good agreement was formed among these three systems over the bubble size range appropriate for each system. RP SU, MY (reprint author), USN,RES LAB,BAY ST LOUIS,MS 39529, USA. NR 0 TC 18 Z9 19 U1 0 U2 2 PU AMER METEOROLOGICAL SOC PI BOSTON PA 45 BEACON ST, BOSTON, MA 02108-3693 SN 0739-0572 J9 J ATMOS OCEAN TECH JI J. Atmos. Ocean. Technol. PD FEB PY 1994 VL 11 IS 1 BP 170 EP 181 DI 10.1175/1520-0426(1994)011<0170:LCOAAO>2.0.CO;2 PN 2 PG 12 WC Engineering, Ocean; Meteorology & Atmospheric Sciences SC Engineering; Meteorology & Atmospheric Sciences GA MV461 UT WOS:A1994MV46100008 ER PT J AU AMBROSIANO, JJ BRANDON, ST LOHNER, R DEVORE, CR AF AMBROSIANO, JJ BRANDON, ST LOHNER, R DEVORE, CR TI ELECTROMAGNETICS VIA THE TAYLOR-GALERKIN FINITE-ELEMENT METHOD ON UNSTRUCTURED GRIDS SO JOURNAL OF COMPUTATIONAL PHYSICS LA English DT Article ID FLUX-CORRECTED TRANSPORT; TIME DOMAIN; TRANSIENT PROBLEMS; MAXWELL EQUATIONS; SCATTERING; ALGORITHMS; FCT AB Traditional techniques for computing electromagnetic solutions in the time domain rely on finite differences. These so-called FDTD (finite-difference time-domain) methods are usually defined only on regular lattices of points and can be too restrictive for geometrically demanding problems. Great geometric flexibility can be achieved by abandoning the regular latticework of sample points and adopting an unstructured grid. An unstructured grid allows one to place the grid points anywhere one chooses, so that curved boundaries can be fit with ease and local regions in which the field gradients are steep can be selectively resolved with a fine mesh. In this paper we present a technique for solving Maxwell's equations on an unstructured grid based on the Taylor-Galerkin finite-element method. We present several numerical examples which reveal the fundamental accuracy and adaptability of the method. Although our examples are in two dimensions, the techniques and results generalize readily to 3D. (C) 1994 Academic Press, Inc. C1 GEORGE WASHINGTON UNIV, SCH ENGN & APPL SCI, CMEE, WASHINGTON, DC 20052 USA. USN, RES LAB, COMPUTAT PHYS & FLUID DYNAM LAB, WASHINGTON, DC 20375 USA. RP LAWRENCE LIVERMORE NATL LAB, LIVERMORE, CA USA. RI DeVore, C/A-6067-2015 OI DeVore, C/0000-0002-4668-591X NR 34 TC 12 Z9 13 U1 0 U2 0 PU ACADEMIC PRESS INC ELSEVIER SCIENCE PI SAN DIEGO PA 525 B ST, STE 1900, SAN DIEGO, CA 92101-4495 USA SN 0021-9991 EI 1090-2716 J9 J COMPUT PHYS JI J. Comput. Phys. PD FEB PY 1994 VL 110 IS 2 BP 310 EP 319 DI 10.1006/jcph.1994.1028 PG 10 WC Computer Science, Interdisciplinary Applications; Physics, Mathematical SC Computer Science; Physics GA ND185 UT WOS:A1994ND18500011 ER PT J AU HAYS, JH SILVERMAN, E POTTER, BB SHAKIR, KMM AF HAYS, JH SILVERMAN, E POTTER, BB SHAKIR, KMM TI NORMAL GASTRIC-INHIBITORY POLYPEPTIDE RESPONSE TO ORAL GLUCOSE IN HYPOTHYROIDISM SO JOURNAL OF ENDOCRINOLOGY LA English DT Article ID INSULIN AB Although the action of gastric inhibitory polypeptide (GIP) on the beta cells of the pancreas is well documented, the effect of this hormone on insulin secretion in patients who are hypothyroid has not been studied. Hypothyroid patients demonstrate increased serum immunoreactive insulin levels in response to oral glucose when compared with euthyroid subjects. We postulated that a delayed and exaggerated response of GIP could account for the hyperinsulinaemic response. Nine thyroidectomized patients (aged 44.9 +/- 3.6 years) who were otherwise healthy but undergoing re-evaluation for recurrence of thyroid carcinoma, were given a 75 g oral glucose tolerance test (OGTT). These subjects were studied 6 weeks after thyroid hormone replacement had been stopped and while on hormone treatment. The serum glucose and plasma GIP responses to oral glucose were similar in the euthyroid and hypothyroid states. The serum insulin response as well as the areas under the curve for insulin following OGTT were significantly elevated (P<0.01) during hypothyroidism. Solid-phase gastric emptying times studied in six patients who were euthyroid and hypothyroid were not different (35 +/- 12 versus 36 +/- 14 min respectively). None of the subjects had detectable levels of serum thyroglobulin, microsomal or parietal cell antibodies. In summary, we have confirmed a hyperinsulinaemic response to an OGTT and normal solid-phase gastric emptying rates in this form of hypothyroidism. We did not find significant differences in serum glucose or GIP responses and postulate this as evidence of resistance to the effects of endogenous insulin. The mechanism of alterations in carbohydrate tolerance in the hypothyroid state continue to remain unknown. C1 USN,NATL MED CTR,DEPT INTERNAL MED,DIV ENDOCRINOL & METAB,BETHESDA,MD 20889. UNIFORMED SERV UNIV HLTH SCI,DEPT MED,BETHESDA,MD 20814. NR 13 TC 5 Z9 5 U1 0 U2 0 PU J ENDOCRINOLOGY LTD PI BRISTOL PA 17/18 THE COURTYARD, WOODLANDS, ALMONDSBURY, BRISTOL, ENGLAND BS12 4NQ SN 0022-0795 J9 J ENDOCRINOL JI J. Endocrinol. PD FEB PY 1994 VL 140 IS 2 BP 309 EP 312 DI 10.1677/joe.0.1400309 PG 4 WC Endocrinology & Metabolism SC Endocrinology & Metabolism GA NC494 UT WOS:A1994NC49400017 PM 8169563 ER PT J AU COPELAND, GS AF COPELAND, GS TI A PERTURBED-PENDULUM MODEL FOR FLAT-PLATE AUTOROTATION SO JOURNAL OF FLUIDS AND STRUCTURES LA English DT Article RP COPELAND, GS (reprint author), USN,CTR SURFACE WARFARE,DIV CARDEROCK,CODE 2041,BETHESDA,MD 20084, USA. NR 10 TC 2 Z9 2 U1 0 U2 0 PU ACADEMIC PRESS LTD PI LONDON PA 24-28 OVAL RD, LONDON, ENGLAND NW1 7DX SN 0889-9746 J9 J FLUID STRUCT JI J. Fluids Struct. PD FEB PY 1994 VL 8 IS 2 BP 125 EP 138 DI 10.1006/jfls.1994.1006 PG 14 WC Engineering, Mechanical; Mechanics SC Engineering; Mechanics GA MW779 UT WOS:A1994MW77900001 ER PT J AU OLSEN, RC SCOTT, LJ BOARDSEN, SA AF OLSEN, RC SCOTT, LJ BOARDSEN, SA TI COMPARISON BETWEEN LIOUVILLES THEOREM AND OBSERVED LATITUDINAL DISTRIBUTIONS OF TRAPPED IONS IN THE PLASMAPAUSE REGION SO JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS LA English DT Article ID EARTHS MAGNETIC EQUATOR; PLASMASPHERE; POPULATIONS; PARTICLE; DAYSIDE; FIELD AB The presence of anisotropic plasma distributions, trapped at the Earth's magnetic equator, has consequences for the electric field structure which must exist in equilibrium along the magnetic field line. Data from SCATHA and Dynamics Explorer 1 indicate that the core ion distributions at the magnetic equator can be well described as bi-Maxwellian distributions, with a perpendicular temperature an order of magnitude larger than the parallel temperature. A collisionless model is developed for the variation in plasma parameters, following the forms developed by Whipple (1977). If the core electron anisotropy is low, the resulting electric field of similar to 0.1 mu V m(-1) is pointed away from the equator. Under these conditions the self-consistent electric field will not overcome the effects of magnetic trapping. The resulting potential distribution results in a local maximum in total plasma density at the equator. Only when the electron distribution is primarily field-aligned can there be a density minimum at the equator. Comparisons are made between this model and the observed variations in DE 1 plasma parameters with latitude. C1 NASA,MSFC,SPACE SCI LAB,HUNTSVILLE,AL 35812. RP OLSEN, RC (reprint author), USN,POSTGRAD SCH,DEPT PHYS,MONTEREY,CA 93943, USA. RI Olsen, Richard/O-2699-2015 OI Olsen, Richard/0000-0002-8344-9297 NR 38 TC 21 Z9 21 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 FEB 1 PY 1994 VL 99 IS A2 BP 2191 EP 2203 DI 10.1029/93JA02776 PG 13 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA MV286 UT WOS:A1994MV28600010 ER PT J AU CARHART, HW AF CARHART, HW TI IMPACT OF LOW O2 ON FIRES SO JOURNAL OF HAZARDOUS MATERIALS LA English DT Article; Proceedings Paper CT ACS-CHAS Symposium on Fire and Explosions CY AUG 26, 1992 CL WASHINGTON, DC SP AMER CHEM SOC, DIV CHEM HLTH & SAFETY AB It is the thesis of this paper to show that through control of oxygen, fires can be markedly minimized or eliminated while still maintaining an atmosphere that will sustain human life. The driving force in this study is to decrease the fire hazard in manned capsules, such as in space, under the ocean, submarines, etc. which operate in an environment exceedingly hostile to life and from which escape is next to impossible. In most studies on fire, the earth's atmosphere with its 21 % (v/v) oxygen is almost a given and is not usually varied. But it takes both a fuel and an oxidizer to have a fire, and though we study extensively the impact of structure, composition, concentration, flammability limits, energies of ignition, propagation rates, etc., for the fuel component of the combustion process there is a significant paucity of information on the impact of variations of the oxidizer. In this paper, the oxidizer of choice is oxygen because we also want to sustain life, and one of the beauties of a totally closed environment is that the oxygen can be varied at will, and we can take advantage of that fact to minimize or quench fires while not jeopardizing life. RP CARHART, HW (reprint author), USN,RES LAB,TECHNOL CTR SAFETY & SURVIVABIL,WASHINGTON,DC 20375, USA. NR 13 TC 2 Z9 2 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0304-3894 J9 J HAZARD MATER JI J. Hazard. Mater. PD FEB PY 1994 VL 36 IS 2 BP 133 EP 141 DI 10.1016/0304-3894(94)85002-X PG 9 WC Engineering, Environmental; Engineering, Civil; Environmental Sciences SC Engineering; Environmental Sciences & Ecology GA MX679 UT WOS:A1994MX67900002 ER PT J AU BARHAM, WB FIGUEROA, R PHILLIPS, IA HYAMS, KC AF BARHAM, WB FIGUEROA, R PHILLIPS, IA HYAMS, KC TI CHRONIC LIVER-DISEASE IN PERU - ROLE OF VIRAL-HEPATITIS SO JOURNAL OF MEDICAL VIROLOGY LA English DT Article DE HEPATITIS B; HEPATITIS C; CIRRHOSIS; HEPATOCELLULAR CARCINOMA ID C VIRUS-ANTIBODIES; RECOMBINANT IMMUNOBLOT ASSAY; NON-B-HEPATITIS; HEPATOCELLULAR-CARCINOMA; RISK-FACTORS; NON-A; PREVALENCE; CIRRHOSIS; INFECTION; TRANSFUSION AB The prevalence of antibodies to hepatitis C virus (anti-HCV) was determined in 105 patients with biopsy-proven chronic liver disease and 128 comparison patients without any evidence of liver pathology living in Lima, Peru. Using a secend-generation EIA screening and supplemental immunoblot assay, anti-HCV was detected in four of 13 patients with chronic hepatitis, in 11% of 85 patients with cirrhosis, and in none of seven patients with hepatocellular carcinoma. Only two (1.6%) comparison patients without liver disease had anti-HCV. Hepatitis 8 surface antigen (HBsAg) was found in 23% of patients with chronic hepatitis, 12% of patients with cirrhosis, and three of seven patients with hepatocellular carcinoma. There was no evidence of chronic viral hepatitis or alcohol abuse (reported by one-third of subjects) in 48% of chronic liver disease patients. These preliminary data suggest that among this South American population neither hepatitis B nor hepatitis C infection is the predominate cause of chronic liver disease and that other infectious or environmental factors may be important, (C) 1994 Wiley-Liss, Inc. C1 USN, MED RES INST, BETHESDA, MD USA. HOSP REBAGLIATI, LIMA, PERU. NAVAL MED RES INST DETACHMENT, LIMA, PERU. RP BARHAM, WB (reprint author), NATL NAVAL MED CTR, DIV INFECT DIS, 8901 WISCONSIN AVE, BETHESDA, MD 20889 USA. NR 28 TC 9 Z9 10 U1 0 U2 1 PU WILEY-LISS PI NEW YORK PA DIV JOHN WILEY & SONS INC 605 THIRD AVE, NEW YORK, NY 10158-0012 SN 0146-6615 J9 J MED VIROL JI J. Med. Virol. PD FEB PY 1994 VL 42 IS 2 BP 129 EP 132 DI 10.1002/jmv.1890420206 PG 4 WC Virology SC Virology GA MT785 UT WOS:A1994MT78500005 PM 8158107 ER PT J AU MIKHAIL, EM MANSOUR, NS AWADALLA, HN AF MIKHAIL, EM MANSOUR, NS AWADALLA, HN TI IDENTIFICATION OF TRICHINELLA ISOLATES FROM NATURALLY INFECTED STRAY DOGS IN EGYPT SO JOURNAL OF PARASITOLOGY LA English DT Note ID ELECTROPHORESIS AB Larvae of Trichinella species recovered from the diaphragms of 2 stray dogs killed during a governmental antirabies campaign in Cairo, Egypt, were fed to white mice for production of adult worms and larvae for morphological and isoenzyme studies. Comparisons were made with reference species of Trichinella spiralis, Trichinella nelsoni, Trichinella nativa, and Trichinella pseudospiralis. Results indicated that the 2 Trichinella specimens from the dogs were morphologically and biochemically identical with T. spiralis. C1 ALEXANDRIA UNIV,FAC MED,ALEXANDRIA,EGYPT. RP MIKHAIL, EM (reprint author), USN,MED RES UNIT 3,RES PUBLICAT BRANCH,PSC 452,BOX 5000,FPO,AE 09835, USA. NR 14 TC 10 Z9 10 U1 0 U2 1 PU AMER SOC PARASITOLOGISTS PI LAWRENCE PA 810 EAST 10TH STREET, LAWRENCE, KS 66044 SN 0022-3395 J9 J PARASITOL JI J. Parasitol. PD FEB PY 1994 VL 80 IS 1 BP 151 EP 154 DI 10.2307/3283360 PG 4 WC Parasitology SC Parasitology GA MV815 UT WOS:A1994MV81500022 PM 8308650 ER PT J AU FREDERIKSEN, PC LOONEY, RE AF FREDERIKSEN, PC LOONEY, RE TI BUDGETARY CONSEQUENCES OF DEFENSE EXPENDITURES IN PAKISTAN - SHORT-RUN IMPACTS AND LONG-RUN ADJUSTMENTS SO JOURNAL OF PEACE RESEARCH LA English DT Article ID MILITARY BURDEN; COUNTRIES AB In the last twenty years, there has been a growing interest in quantifying the 'guns versus butter' tradeoff facing developing countries. This article examines Pakistan's military expenditures between 1073 and 1986 and estimates both a short-run impact model and long-run adjustment model to measure how changes in the defense burden, the deficit, and government debt have affected budget allocations to economic services programs and administrative/social programs. In addition, we investigate whether defense budgets have been increased or maintained either at the expense of economic and social programs in general or merely confined to one or two specific programs. Military expenditure patterns are analyzed to see whether or not they were responsible for across-the-board cuts in long-term infrastructure programs. Our analysis indicates that the deficit, the debt service, and the military burden are often interrelated in such a complex manner that the impact of any specific program is difficult to predict. In the short run, most infrastructure programs increased as the military burden declined. The opposite was generally true for social programs such as social security, welfare, and housing. Changes in the defense budget appear to have only a transitory effect on the share of government expenditures allocated toward infrastructure. The long-run model suggests that social programs have just as high a priority as economic services. When the military burden increases, the government is willing to take some resources from infrastructure programs and lets the deficit grow to finance social programs. Our results also suggest a long run pattern of adjustment in social programs but not infrastructure programs - a counter-intuitive result given Pakistan's severe infrastructure constraints. RP FREDERIKSEN, PC (reprint author), USN,POSTGRAD SCH,INST DEF RESOURCE MANAGEMENT,MONTEREY,CA 93940, USA. NR 14 TC 9 Z9 9 U1 0 U2 1 PU SAGE PUBLICATIONS LTD PI LONDON PA 6 BONHILL STREET, LONDON, ENGLAND EC2A 4PU SN 0022-3433 J9 J PEACE RES JI J. Peace Res. PD FEB PY 1994 VL 31 IS 1 BP 11 EP 18 DI 10.1177/0022343394031001002 PG 8 WC International Relations; Political Science SC International Relations; Government & Law GA MY383 UT WOS:A1994MY38300002 ER PT J AU SMEDSTAD, OM FOX, DN AF SMEDSTAD, OM FOX, DN TI ASSIMILATION OF ALTIMETER DATA IN A 2-LAYER PRIMITIVE EQUATION MODEL OF THE GULF-STREAM SO JOURNAL OF PHYSICAL OCEANOGRAPHY LA English DT Article ID OCEAN CIRCULATION MODEL; SEA-LEVEL DIFFERENCES; KALMAN FILTER; VARIATIONAL ASSIMILATION; XBT DATA; INITIALIZATION; CONSTRAINTS; SENSITIVITY; INVERSE; PACIFIC AB A two-layer finite depth, primitive equation model of the Gulf Stream region is used to study the effect of updating the model with simulated altimeter data as observations. In this study both a complete field of sea surface height (SSH) and SSH sampled along satellite tracks are used as ''observations.'' A simulated 17-day repeat orbit corresponding to the Geosat-ERM and a 10-day repeat period corresponding to Topex/Poseidon are used. Satellite observations give only information about the sea surface height but previous studies have shown that it is important to transfer the surface information to the lower layer as fast as possible in order for the model to have a realistic evolution. A statistical inference technique is therefore used to update the lower-layer pressure field. The velocity fields in both layers are updated using a geostrophic correction calculated from the change in the pressure fields. It is shown that updating the velocities is important for the assimilation to be successful. When complete fields of sea surface heights from an identical twin experiment are assimilated the rms error between the model solution and the ''true'' ocean for the upper-layer pressure held is reduced to less than 5% after six weeks of assimilation. Assimilation of simulated observations along Geosat-ERM and Topex/Poseidon tracks show that both satellites give similar levels of rms error at the end of the assimilation period. The effect of assimilating altimeter data from two satellites is also discussed. The results show there can be a reduction in the rms error of up to 40% with the addition of a second satellite with appropriate orbital characteristics. C1 USN,RES LAB,BAY ST LOUIS,MS. RP SMEDSTAD, OM (reprint author), PLANNING SYST INC,115 CHRISTIAN LANE,SLIDELL,LA 70458, USA. NR 40 TC 25 Z9 25 U1 0 U2 0 PU AMER METEOROLOGICAL SOC PI BOSTON PA 45 BEACON ST, BOSTON, MA 02108-3693 SN 0022-3670 J9 J PHYS OCEANOGR JI J. Phys. Oceanogr. PD FEB PY 1994 VL 24 IS 2 BP 305 EP 325 DI 10.1175/1520-0485(1994)024<0305:AOADIA>2.0.CO;2 PG 21 WC Oceanography SC Oceanography GA MW715 UT WOS:A1994MW71500006 ER PT J AU MONTGOMERY, SR FONTANELLA, JJ WINTERSGILL, MC AF MONTGOMERY, SR FONTANELLA, JJ WINTERSGILL, MC TI OPTICAL-ABSORPTION AND ELECTRICAL RELAXATION IN ALKALINE-EARTH FLUORIDES DOPED WITH URANIUM SO JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS LA English DT Article DE DIELECTRIC RELAXATION; DEFECTS; ALKALINE EARTH FLUORIDES; OPTICAL ABSORPTION; URANIUM; MIXED VALENCE ID CALCIUM-FLUORIDE; SOLID-SOLUTIONS; DIELECTRIC-RELAXATION; CRYSTALS; CLUSTER AB This work is concerned with optical absorption and electrical relaxation studies of calcium, barium, and strontium fluorides containing uranium up to the 0.5% doping level. The optical absorption spectra indicate the existence of both U4+ and U3+ ions but there is no evidence of any U2+ ions. Each sample exhibits two or more electrical relaxation peaks. By comparison with previous work on the alkaline earth fluorides containing known tetravalent and trivalent ions, some relaxations can be attributed to trivalent uranium and others to tetravalent uranium and thus both the electrical relaxation and optical absorption data reveal the presence of both U4+ and U3+ ions. RP MONTGOMERY, SR (reprint author), USN ACAD,DEPT PHYS,ANNAPOLIS,MD 21402, USA. NR 19 TC 3 Z9 3 U1 0 U2 1 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0022-3697 J9 J PHYS CHEM SOLIDS JI J. Phys. Chem. Solids PD FEB PY 1994 VL 55 IS 2 BP 201 EP 206 DI 10.1016/0022-3697(94)90079-5 PG 6 WC Chemistry, Multidisciplinary; Physics, Condensed Matter SC Chemistry; Physics GA NF534 UT WOS:A1994NF53400011 ER PT J AU FONTANELLA, JJ MCLIN, MG WINTERSGILL, MC AF FONTANELLA, JJ MCLIN, MG WINTERSGILL, MC TI ELECTRICAL RELAXATION IN IN-SITU DRIED ACID-FORM NAFION SO JOURNAL OF POLYMER SCIENCE PART B-POLYMER PHYSICS LA English DT Article DE NAFION; ELECTRICAL RELAXATION; ELECTRICAL CONDUCTIVITY; ELECTRICAL MODULUS; DIELECTRIC RELAXATION ID CONTAINING PERFLUOROSULFONATE IONOMERS; DIELECTRIC-RELAXATION; POLY(PROPYLENE OXIDE); HIGH-PRESSURE; ION MOTIONS; CONDUCTIVITY; POLYMERS; SALTS; MEMBRANES; SYSTEMS AB Electrical relaxation studies have been carried out on dried, acid-form Nafion 117 (copolymer of tetrafluoroethylene and perfluoro 3,6-dioxa-4-methyl-7-octenesulfonic acid and which has an equivalent weight of 1100). Significant electrical conductivity is found and the data are found to be non-Arrhenius. The results are converted to the electrical modulus representation and a conductivity relaxation is observed. A stretched exponential is best-fit to the conductivity relaxation and again, non-Arrhenius behavior is observed for the peak position. Finally, at low temperatures, a new dielectric relaxation peak is found which has an activation enthalpy of about 0.57 eV (13 kcal/mol). This relaxation is analogous to the gamma-relaxation observed in mechanical relaxation studies. (C) 1994 John Wiley & Sons, Inc. RP FONTANELLA, JJ (reprint author), USN,DEPT PHYS,ANNAPOLIS,MD 21402, USA. NR 28 TC 29 Z9 29 U1 0 U2 5 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 FEB PY 1994 VL 32 IS 3 BP 501 EP 507 DI 10.1002/polb.1994.090320311 PG 7 WC Polymer Science SC Polymer Science GA MR784 UT WOS:A1994MR78400011 ER PT J AU THOMPSON, JR THOMPSON, RA AF THOMPSON, JR THOMPSON, RA TI A LITERARY TREASURE HOUSE FOR TEACHERS - THE INTERNATIONALE JUGENDBIBLIOTHEK IN MUNICH SO JOURNAL OF READING LA English DT Article C1 UNIV CENT FLORIDA,DEPT INSTRUCT PROGRAMS,ORLANDO,FL 32816. RP THOMPSON, JR (reprint author), USN,WASHINGTON,DC 20350, USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU INT READING ASSOC PI NEWARK PA 800 BARKSDALE RD P O BOX 8139, NEWARK, DE 19714 SN 0022-4103 J9 J READING JI J. Read. PD FEB PY 1994 VL 37 IS 5 BP 386 EP 388 PG 3 WC Education & Educational Research SC Education & Educational Research GA MU669 UT WOS:A1994MU66900005 ER PT J AU MOURING, SE ELLINGWOOD, BR AF MOURING, SE ELLINGWOOD, BR TI GUIDELINES TO MINIMIZE FLOOR VIBRATIONS FROM BUILDING OCCUPANTS SO JOURNAL OF STRUCTURAL ENGINEERING-ASCE LA English DT Article AB One major serviceability consideration in modern buildings is excessive floor vibrations due to occupant activities. Floor vibrations are becoming a more important design consideration with the use of high-strength, light-weight materials in building structures, longer floor spans, and more flexible framing systems. Floor systems in shopping malls, pedestrian walkways and concourses, and gymnasiums are relatively light and susceptible to vibration problems. Methods for accurate prediction of these vibrations and evaluation of floor systems are not readily available to the design community. An investigation is made into the characteristics of crowd-induced loads. These characteristics include the density of the crowd, randomness of crowd movement, crowd activity, and temporal interaction between individuals. Analytical procedures are developed to determine the influence of each load characteristic on the dynamic response of floor systems. Design guidelines are developed for floors in malls, gymnasiums, and walkways subject to crowd-induced loads. C1 JOHNS HOPKINS UNIV,DEPT CIVIL ENGN,BALTIMORE,MD 21218. RP MOURING, SE (reprint author), USN ACAD,DEPT NAVAL ARCH OC & MARINE ENGRG,ANNAPOLIS,MD 21402, USA. NR 20 TC 15 Z9 22 U1 2 U2 6 PU ASCE-AMER SOC CIVIL ENGINEERS PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2398 SN 0733-9445 J9 J STRUCT ENG-ASCE JI J. Struct. Eng.-ASCE PD FEB PY 1994 VL 120 IS 2 BP 507 EP 526 DI 10.1061/(ASCE)0733-9445(1994)120:2(507) PG 20 WC Construction & Building Technology; Engineering, Civil SC Construction & Building Technology; Engineering GA MT459 UT WOS:A1994MT45900011 ER PT J AU VANDERAH, TA LOWEMA, CK AF VANDERAH, TA LOWEMA, CK TI CRYSTAL-CHEMICAL ANOMALIES IN NONSUPERCONDUCTING PRBA2CU3O7 SO JOURNAL OF SUPERCONDUCTIVITY LA English DT Article DE PRBA2CU3O7; RBA2CU3O7; APICAL OXYGEN; HYBRIDIZATION; AXIAL CU-O BOND ID NEUTRON-POWDER-DIFFRACTION; SUPERCONDUCTING TRANSITION; STRUCTURAL-PROPERTIES; HIGH-TC; OXYGEN; YBA2CU3O7; SYSTEM; TEMPERATURE; VALENCE; STATE AB Studies of the crystal chemistry of nonsuperconducting PrBa2Cu3O7 indicate that t is compound is strictly isostructural with its superconducting RBa2Cu3O7 (R = Y, rare earth) analogs. Crystallographically, Pr is present in the trivalent state according to the structural trends exhibited by the RBa2Cu3O7 series as a function of R3+ ionic radius. The sole structural anomaly attributable to the presence of Pr3+ in the YBa2Cu3O7 structure is a next-next-nearest neighbor effect and consists of an unusually short axial Cu-O distance, i.e., a short bond length between the in-plane copper and the chain oxygen. The correlation of this anomaly with the nonmetallic/nonsuperconducting properties of PrBa2Cu3O7 supports a variety of literature reports, both theoretical and experimental, suggesting that the apical oxygen in the YBa2Cu3O7 structure plays a critical role in mediating the appearance of superconductivity. The mechanism by which the f-electrons in Pr3+ (f2) interact with the Cu-O manifold to produce the nonmetallic behavior of PrBa2Cu3O7 remains unknown; however, superconductivity is ''turned back on'' for Nd3+ (f3), immediately next to Pr and just slightly smaller. Careful comparative studies of superconducting NdBa2Cu3O7 and nonmetallic PrBa2Cu3O7 are needed to elucidate the critical difference in the behavior of the f-electrons and may shed light on the fundamental mechanism of high-temperature superconductivity in copper oxides. RP VANDERAH, TA (reprint author), USN,CTR WEAP,DIV AIR WARFARE,RES DEPT,DIV CHEM,CHINA LAKE,CA 93555, USA. NR 44 TC 10 Z9 10 U1 1 U2 1 PU PLENUM PUBL CORP PI NEW YORK PA 233 SPRING ST, NEW YORK, NY 10013 SN 0896-1107 J9 J SUPERCOND JI J. Supercond. PD FEB PY 1994 VL 7 IS 1 BP 107 EP 111 DI 10.1007/BF00730378 PG 5 WC Physics, Applied; Physics, Condensed Matter SC Physics GA NH488 UT WOS:A1994NH48800021 ER PT J AU REEVES, ME KRESIN, VZ WOLF, SA AF REEVES, ME KRESIN, VZ WOLF, SA TI THERMODYNAMIC DETERMINATION OF THE ELECTRON-PHONON COUPLING STRENGTH IN YBA2CU3O7-DELTA SO JOURNAL OF SUPERCONDUCTIVITY LA English DT Article DE CU-O PLANES; CU-O CHAINS; ELECTRON-PHONON COUPLING; SPECIFIC HEAT ID UPPER CRITICAL-FIELD; SUPERCONDUCTORS; TEMPERATURE; TC; PARAMETERS; HEAT AB The relative enthalpy of YBa2Cu3O7-delta has been measured between the temperatures 273 and 700 K. From these data, we find that the electronic contribution to the specific heat is linear in temperature with a Sommerfeld constant of 25 +/- 3 mJ/mole . K2. We analyze the data to show that the normal state of YBa2Cu3O7-delta is described by two conduction bands and strong electron-phonon coupling. The electron-phonon coupling is, in fact, sufficient to account for the high T(c) in YBa2CuO7-delta. C1 CATHOLIC UNIV AMER,DEPT PHYS,WASHINGTON,DC 20064. LAWRENCE BERKELEY LAB,BERKELEY,CA 94720. RP REEVES, ME (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. RI Wolf, Stuart/A-7513-2009 NR 29 TC 0 Z9 0 U1 0 U2 1 PU PLENUM PUBL CORP PI NEW YORK PA 233 SPRING ST, NEW YORK, NY 10013 SN 0896-1107 J9 J SUPERCOND JI J. Supercond. PD FEB PY 1994 VL 7 IS 1 BP 257 EP 259 DI 10.1007/BF00730407 PG 3 WC Physics, Applied; Physics, Condensed Matter SC Physics GA NH488 UT WOS:A1994NH48800050 ER PT J AU HOBAN, LD PIERCE, M QUANCE, J HAYWARD, I MCKEE, A GOWDA, DC URRY, DW WILLIAMS, T AF HOBAN, LD PIERCE, M QUANCE, J HAYWARD, I MCKEE, A GOWDA, DC URRY, DW WILLIAMS, T TI USE OF POLYPENTAPEPTIDES OF ELASTIN TO PREVENT POSTOPERATIVE ADHESIONS - EFFICACY IN A CONTAMINATED PERITONEAL MODEL SO JOURNAL OF SURGICAL RESEARCH LA English DT Article ID INTRAPERITONEAL ADHESIONS; PELVIC ADHESIONS; INFERTILITY; SURGERY AB We investigated the use of a sheet of polypentapeptide of elastin as a physical barrier to adhesion formation in a contaminated peritoneal wound model. A total of 88 rats were studied with random assignment of animals to three study groups; control (29), polypentapeptide steam sterilized (30), and polypentapeptide gas sterilized (29). Animals were anesthetized and a laparotomy was conducted to reveal the cranial portion of the ileum. The abdominal wall muscle peritoneum was excoriated until hemorrhage was noted. In sham animals, there was no physical barrier placed between bowel loop and the abdominal wall. In two of the study groups, the polypentapeptide sheet was placed directly over the excoriated area. The intestinal loop was then loosely secured to excoriated area with 2-0 nylon (stay suture) which was tied subcutaneously in all groups. Four puncture wounds were made with a 20-gauge hypodermic needle in the bowel that was apposed to the excoriated peritoneal musculature which allowed leakage of intestinal contents and contamination. On Day 7 postsurgery, the animals were anesthetized and the stay suture was removed. On Day 14, all animals were sacrificed and adhesions were graded. The incidence of significant adhesions was 28% for the barrier group versus 90% for control animals (P < 0.05). The results of this study indicate that the polypentapeptide of elastin sheet is an effective physical barrier in this surgically induced contaminated wound model. (C) 1994 Academic Press, Inc. C1 BIOELAST RES LTD,BIRMINGHAM,AL 35205. RP HOBAN, LD (reprint author), USN,MED RES INST,8901 WISCONSIN AVE,BETHESDA,MD 20889, USA. NR 28 TC 20 Z9 20 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 0022-4804 J9 J SURG RES JI J. Surg. Res. PD FEB PY 1994 VL 56 IS 2 BP 179 EP 183 DI 10.1006/jsre.1994.1029 PG 5 WC Surgery SC Surgery GA MZ260 UT WOS:A1994MZ26000010 PM 8121175 ER PT J AU OGDEN, PM ERSKINE, FT AF OGDEN, PM ERSKINE, FT TI SURFACE SCATTERING MEASUREMENTS USING BROAD-BAND EXPLOSIVE CHARGES IN THE CRITICAL-SEA-TEST EXPERIMENTS SO JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA LA English DT Article ID ACOUSTIC SCATTERING AB Extensive measurements of low-frequency (70-1000 Hz) sea surface backscattering strengths have been made as part of the Critical Sea Test (CST) experiments. These measurements were made during CST-1 through CST-5 for a variety of wind speeds from 1.5 to 13.5 m/s and for mean grazing angles from about 5 to 30 deg. These measurements have revealed several regimes in a frequency versus wind speed domain that probably correspond to at least two distinct scattering mechanisms. For relatively calm seas at high frequencies and for all wind speeds at lower frequencies, perturbation theory is found to give an adequate description of surface scattering. For rougher seas and higher frequencies, the Chapman-Harris empirical curves are adequate predictors of the levels of surface scattering. In between these two regimes is a transition region where the scattering strengths are more difficult to predict, as they depend on the details of the surface and wind characteristics. These observations lead to the idea that there are two mechanisms that dominate the scattering of sound from the surface. In the perturbation theory regime, air-water interface scattering is the dominant mechanism; in the Chapman-Harris regime, another mechanism such as scattering from subsurface bubble clouds must dominate the scattering process. The transition region is then the part of the frequency and wind speed domain where the two effects are competing. RP OGDEN, PM (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 19 TC 21 Z9 24 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 FEB PY 1994 VL 95 IS 2 BP 746 EP 761 DI 10.1121/1.408385 PG 16 WC Acoustics; Audiology & Speech-Language Pathology SC Acoustics; Audiology & Speech-Language Pathology GA MW284 UT WOS:A1994MW28400016 ER PT J AU RITTENMYER, KM AF RITTENMYER, KM TI ELECTROSTRICTIVE CERAMICS FOR UNDERWATER TRANSDUCER APPLICATIONS SO JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA LA English DT Article ID LEAD MAGNESIUM NIOBATE AB The electromechanical properties of two electrostrictive materials designed for use in underwater acoustic applications are determined as functions of temperature and electric field. The materials are 0.859 Pb(Mg1/3Nb2/3)O-3-0.141 PbTiO3 doped with 2.5% SrTiO3 or BaTiO3. Dielectric properties are determined as functions of temperature and electric field. The equivalent piezoelectric coefficients were found as functions of temperature to be equal to or superior to the lead zirconate-titanate ceramics at very modest de bias fields (2 kV/cm) at temperatures in the range from 10 to 35 degrees C. Outside of this temperature range, the piezoelectric and dielectric coefficents decrease rapidly. Electromechanical losses were found to be sufficiently small for the SrTiO3 composition but not the BaTiO3 composition. RP RITTENMYER, KM (reprint author), USN,RES LAB,UNDERWATER SOUND REFERENCE DETACHMENT,POB 568337,ORLANDO,FL 32856, USA. NR 9 TC 32 Z9 33 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 FEB PY 1994 VL 95 IS 2 BP 849 EP 856 DI 10.1121/1.408395 PG 8 WC Acoustics; Audiology & Speech-Language Pathology SC Acoustics; Audiology & Speech-Language Pathology GA MW284 UT WOS:A1994MW28400026 ER PT J AU YEN, NC AF YEN, NC TI WAVE-PACKET DECOMPOSITION SO JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA LA English DT Article ID TIME; SIGNALS AB Various decomposition techniques have been employed in signal processing for exploiting and highlighting the characteristics of a given signal. The approach discussed in this paper, conceived from the observation of wave packets in scattering phenomena, is to examine the natural representation of a signal through the dynamic time and frequency properties of its energy distribution. For a time-varying signal from a physical system with finite energy content, the selected natural frame component functions, which may not be necessarily orthogonal, can form a complete set for the particular signal under analysis. The decomposition with these nonorthogonal frames then becomes optimal and unique. Algorithms for evaluating the composition of this type of frame are derived from the coherence property of the given signal and image processing is used to estimate the approximate form of needed functions. A simulated multimode signal and the response of the scattered wave signature from an isolated spherical shell are examples used to illustrate a heuristic approach, based on this decomposition method, for resolving the inverse problem in physical systems. C1 USN,RES LAB,DIV ACOUST,WASHINGTON,DC 20375. NR 17 TC 14 Z9 16 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 FEB PY 1994 VL 95 IS 2 BP 889 EP 896 DI 10.1121/1.408399 PG 8 WC Acoustics; Audiology & Speech-Language Pathology SC Acoustics; Audiology & Speech-Language Pathology GA MW284 UT WOS:A1994MW28400030 ER PT J AU CELLI, V ONG, TT TRAN, P AF CELLI, V ONG, TT TRAN, P TI LIGHT-SCATTERING FROM A RANDOMLY ORIENTED ANISOTROPIC LAYER ON A ROUGH-SURFACE SO JOURNAL OF THE OPTICAL SOCIETY OF AMERICA A-OPTICS IMAGE SCIENCE AND VISION LA English DT Article AB We compute the diffuse light scattering from a thin layer of randomly oriented anisotropic crystallites on a rough metal surface. A thin anisotropic layer can simply represent the anisotropic surface response of a crystal. We find, in particular, that the inhomogeneity of the surface anisotropy is a significant source of cross-polarized light scattering from a smooth polycrystalline surface. For such a surface the cross-polarized scattering that could be due to residual surface roughness is much smaller than that observed in the case of normal incidence on Ag. Our model of surface anisotropy simply accounts for the magnitude of cross-polarized scattering, but it predicts a ratio of ps to sp scattering that does not agree with that of existing experiments. C1 USN, CTR AIR WARFARE, DIV WEAP, CHINA LAKE, CA 93555 USA. RP UNIV VIRGINIA, DEPT PHYS, CHARLOTTESVILLE, VA 22901 USA. NR 17 TC 2 Z9 2 U1 0 U2 0 PU OPTICAL SOC AMER PI WASHINGTON PA 2010 MASSACHUSETTS AVE NW, WASHINGTON, DC 20036 USA SN 1084-7529 EI 1520-8532 J9 J OPT SOC AM A JI J. Opt. Soc. Am. A-Opt. Image Sci. Vis. PD FEB PY 1994 VL 11 IS 2 BP 716 EP 722 DI 10.1364/JOSAA.11.000716 PG 7 WC Optics SC Optics GA MV331 UT WOS:A1994MV33100029 ER PT J AU LEE, GU KIDWELL, DA COLTON, RJ AF LEE, GU KIDWELL, DA COLTON, RJ TI SENSING DISCRETE STREPTAVIDIN BIOTIN INTERACTIONS WITH ATOMIC-FORCE MICROSCOPY SO LANGMUIR LA English DT Letter ID CELLS AB Molecular recognition forms the basis for assembly and regulation in living organisms. We have used the atomic force microscope (AFM) to study the interaction of a model receptor streptavidin with its ligand biotin under physiological conditions. Surfaces functionalized with biotin and streptavidin exhibited adhesive forces 3-8 times greater than the nonspecific interactions observed between blocked streptavidin and biotinylated surfaces. The magnitude and distribution of the observed adhesive forces suggest they result from individual streptavidin-biotin interactions. This technique provides a means to directly study molecular recognition interactions at the molecular level. RP LEE, GU (reprint author), USN,RES LAB,SURFACE CHEM BRANCH,CODE 6177,WASHINGTON,DC 20375, USA. RI Lee, Gil/P-8696-2016 OI Lee, Gil/0000-0002-7949-5848 NR 30 TC 580 Z9 591 U1 5 U2 92 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0743-7463 J9 LANGMUIR JI Langmuir PD FEB PY 1994 VL 10 IS 2 BP 354 EP 357 DI 10.1021/la00014a003 PG 4 WC Chemistry, Multidisciplinary; Chemistry, Physical; Materials Science, Multidisciplinary SC Chemistry; Materials Science GA MY212 UT WOS:A1994MY21200003 ER PT J AU SEDRIKS, AJ AF SEDRIKS, AJ TI ADVANCED MATERIALS IN MARINE ENVIRONMENTS SO MATERIALS PERFORMANCE LA English DT Article AB This article outlines engineering applications of advanced materials, such as polymer-matrix composites; superferritic, superaustenitic, and superduplex stainless steels (SS); and titanium alloys in hulls, condensers/heat exchangers, and centrifugal pumps operating in marine environments. Although many traditional seawater corrosion problems have been eliminated by the use of these materials, other environment-induced effects have been identified, notable among them strength degradation, blister formation, and cavitation in polymer-matrix composites; hydrogen embrittlement and crevice corrosion in superferritic SS; and hydride precipitation in titanium. Measures for avoiding these effects are discussed. RP SEDRIKS, AJ (reprint author), OFF NAVAL RES,800 N QUINCY ST,ARLINGTON,VA 22217, USA. NR 21 TC 10 Z9 10 U1 0 U2 2 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 FEB PY 1994 VL 33 IS 2 BP 56 EP 63 PG 8 WC Materials Science, Characterization & Testing SC Materials Science GA MW843 UT WOS:A1994MW84300017 ER PT J AU PORR, WC GANGLOFF, RP AF PORR, WC GANGLOFF, RP TI ELEVATED-TEMPERATURE FRACTURE OF RS PM ALLOY 8009 .1. FRACTURE-MECHANICS BEHAVIOR SO METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE LA English DT Article ID FE-V-SI; SHEET TOUGHENING MECHANISM; ALUMINUM-ALLOYS; CRACK-GROWTH; STRAIN RATE; RAPID SOLIDIFICATION; POWDER-METALLURGY; DUCTILE FAILURE; X ALLOYS; TOUGHNESS AB Increasing temperature and decreasing loading rate degrade the plane strain initiation (K(ICi) from the J integral) and growth (tearing modulus, T(R)) fracture toughnesses of RS/PM 8009 (Al-8.5Fe-1.3V-1.7Si, wt pct). K(ICi) decreases with increasing temperature from 25-degrees-C to 175-degrees-C (33 to 15 MPa square-root m for an extrusion and 28 to 11 MPa square-root m for hot cross-rolled plate) and further declines to 10 MPa square-root m at 316-degrees-C without a minimum. T(R) is greater than zero at all temperatures and is minimized at 200-degrees-C. A four order-of-magnitude decrease in loading rate, at 175-degrees-C, results in a 2.5-fold decrease in K(ICi) and a 5-fold reduction in T(R). K(ICi) and T(R) are anisotropic for extruded 8009 but are isotropic for cross-rolled plate. Cross rolling does not improve the magnitude or adverse temperature dependence of toughness. Delamination occurs along oxide-decorated particle boundaries for extruded but not cross-rolled 8009. Delamination toughening plays no role in the temperature dependence of K(ICi), however, T(R) is increased by this mechanism. Macroscopic work softening and flow localization do not occur for notch-root deformation; such uniaxial tensile phenomena may not be directly relevant to crack-tip fracture. Micromechanical modeling, employing temperature-dependent flow strength, modulus, and constrained fracture strain, reasonably predicts the temperature dependencies of K(ICi) and T(R) for 8009. While E and sigma(ys) decrease with increasing temperature for all aluminum alloys, the strain to nucleate crack-tip damage dominates the fracture toughness of 8009 and decreases with increasing temperature for a range of constraint. Damage mechanisms for this novel behavior are evaluated in Part II. C1 UNIV VIRGINIA,DEPT MAT SCI & ENGN,CHARLOTTESVILLE,VA 22903. RP PORR, WC (reprint author), USN,CTR SURFACE WARFARE,CARDEROCK DIV,FATIGUE & FRACTURE BRANCH,ANNAPOLIS,MD 21402, USA. NR 69 TC 17 Z9 17 U1 2 U2 4 PU MINERALS METALS MATERIALS SOC PI WARRENDALE PA 420 COMMONWEALTH DR, WARRENDALE, PA 15086 SN 1073-5623 J9 METALL MATER TRANS A JI Metall. Mater. Trans. A-Phys. Metall. Mater. Sci. PD FEB PY 1994 VL 25 IS 2 BP 365 EP 379 DI 10.1007/BF02647982 PG 15 WC Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Materials Science; Metallurgy & Metallurgical Engineering GA NE734 UT WOS:A1994NE73400014 ER PT J AU WOODHEAD, AB MOYNIHAN, MEW AF WOODHEAD, AB MOYNIHAN, MEW TI THE EFFECT OF AVIATION OFFICER CANDIDATES SCHOOL ON AEROBIC AND ANAEROBIC FITNESS SO MILITARY MEDICINE LA English DT Article AB The purpose of this study was to determine the effect of Aviation Officer's Candidate School (AOCS) on the aerobic and anaerobic fitness of the candidates. Thirty candidates were tested prior to and post-AOCS. Anaerobic measures included vertical jump and seated shot-put throw. A 1.5-mile run was used as an aerobic measure. Timed push-ups and sit-ups were used as overall strength and endurance measures. Body fat was assessed by OPNAV 6110.1 standards. Statistically significant increases were achieved in all areas, except for body fat and push-ups, which produced no significant changes. RP WOODHEAD, AB (reprint author), USN HOSP,DEPT PHYS THERAPY,HIGHWAY 98,PENSACOLA,FL 32512, USA. NR 0 TC 3 Z9 3 U1 0 U2 4 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 FEB PY 1994 VL 159 IS 2 BP 118 EP 120 PG 3 WC Medicine, General & Internal SC General & Internal Medicine GA NB549 UT WOS:A1994NB54900009 PM 8202236 ER PT J AU PETRE, AM AF PETRE, AM TI USE OF ROUTINE LABORING EPIDURALS AT NAVAL HOSPITALS - A PHYSICIAN SURVEY SO MILITARY MEDICINE LA English DT Article AB Physicians and patients have complained about a lack of laboring epidurals at Naval hospitals. In order to assess this situation, a survey was mailed to all physicians specializing in obstetrics and gynecology (OB) and family practice who were stationed at Naval hospitals in the United States and abroad. Respondents were queried regarding the availability of routine laboring epidurals (RLEs) at their hospitals, as well as their attitudes toward the use of RLEs. RLEs were reported to be available for most patients who might benefit at OB hospitals but not at other Naval hospitals. Most physicians stated that patients complained about a lack of RLEs and that the patient could obtain one at a civilian hospital in the area. Most physicians, especially OBs, had favorable attitudes regarding the use of RLEs and would employ them if available. The discussion includes how the Department of Defense has taken steps toward making epidurals available to all military women and dependents. RP PETRE, AM (reprint author), USN,HOSP TWENTYNINE PALMS,MCAGCC,DEPT FAMILY PRACTICE,BOX 788250,TWENTYNINE PALMS,CA 92278, USA. NR 0 TC 0 Z9 0 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 FEB PY 1994 VL 159 IS 2 BP 154 EP 157 PG 4 WC Medicine, General & Internal SC General & Internal Medicine GA NB549 UT WOS:A1994NB54900019 PM 8202246 ER PT J AU WEISS, WM EGAN, MC AMUNDSON, DE AF WEISS, WM EGAN, MC AMUNDSON, DE TI TRAUMATIC HEMIPELVECTOMY - A SURVIVABLE INJURY SO MILITARY MEDICINE LA English DT Note AB Traumatic injury remains an unfortunate and all too-common event in the United States military population. Traumatic hemipelvectomy is a rare but devastating injury with few survivors recorded in the medical literature. We report a surviving case of traumatic hemipelvectomy and review an approach to management. RP WEISS, WM (reprint author), USN HOSP,MED CTR,DEPT CLIN INVEST,SAN DIEGO,CA 92134, USA. NR 0 TC 7 Z9 7 U1 0 U2 2 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 FEB PY 1994 VL 159 IS 2 BP 164 EP 166 PG 3 WC Medicine, General & Internal SC General & Internal Medicine GA NB549 UT WOS:A1994NB54900022 PM 8202249 ER PT J AU PAULEY, PM WU, XH AF PAULEY, PM WU, XH TI CONTRASTS IN OBJECTIVE ANALYSIS PHILOSOPHY - COMMENTS ON THE THEORETICAL, DISCRETE, AND ACTUAL RESPONSE OF THE BARNES OBJECTIVE ANALYSIS SCHEME FOR ONE-DIMENSIONAL AND 2-DIMENSIONAL FIELDS - REPLY SO MONTHLY WEATHER REVIEW LA English DT Note C1 UNIV WISCONSIN,CTR SPACE SCI & ENGN,MADISON,WI 53706. RP PAULEY, PM (reprint author), USN,NAVAL POSTGRAD SCH,DEPT METEOROL,CODE MR PA,589 DYER RD,RM 252,MONTEREY,CA 93940, USA. NR 5 TC 0 Z9 0 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 FEB PY 1994 VL 122 IS 2 BP 399 EP 401 DI 10.1175/1520-0493(1994)122<0399:R>2.0.CO;2 PG 3 WC Meteorology & Atmospheric Sciences SC Meteorology & Atmospheric Sciences GA MW544 UT WOS:A1994MW54400012 ER PT J AU BROWN, GG LAWPHONGPANICH, S THURMAN, KP AF BROWN, GG LAWPHONGPANICH, S THURMAN, KP TI OPTIMIZING SHIP BERTHING SO NAVAL RESEARCH LOGISTICS LA English DT Article AB Ship berthing plans reserve a location for inbound U.S. Navy surface vessels prior to their port entrance, or reassign ships once in port to allow them to complete, in a timely manner, reprovisioning, repair, maintenance, training, and certification tests prior to redeploying for future operational commitments. Each ship requires different services when in port, such as shore power, crane, ordnance, and fuel. Unfortunately, not all services are offered at all piers, and berth shifting is disruptive and expensive: A port operations scheduler strives to reduce unnecessary berth shifts: We present an optimization model for berth planning and demonstrate it for Norfolk Naval Station, which exhibits all the richness of berthing problems the Navy faces. (C) 1994 John Wiley & Sons, Inc. RP BROWN, GG (reprint author), NAVAL POSTGRAD SCH,MONTEREY,CA 93943, USA. NR 13 TC 51 Z9 55 U1 0 U2 2 PU JOHN WILEY & SONS INC PI NEW YORK PA 605 THIRD AVE, NEW YORK, NY 10158-0012 SN 0894-069X J9 NAV RES LOG JI Nav. Res. Logist. PD FEB PY 1994 VL 41 IS 1 BP 1 EP 15 DI 10.1002/1520-6750(199402)41:1<1::AID-NAV3220410102>3.0.CO;2-L PG 15 WC Operations Research & Management Science SC Operations Research & Management Science GA MR133 UT WOS:A1994MR13300001 ER PT J AU MEADOWS, L MEADOWS, G TROESCH, A COHEN, S BEIER, KP ROOT, G GRIFFIN, OM SWEAN, TF AF MEADOWS, L MEADOWS, G TROESCH, A COHEN, S BEIER, KP ROOT, G GRIFFIN, OM SWEAN, TF TI LAGRANGIAN VELOCITY PROFILES IN THE WAKE OF A HIGH-SPEED VESSEL SO OCEAN ENGINEERING LA English DT Article AB A video imaging technique is employed in a towing basin to obtain high resolution surface Lagrangian velocity observations in the centerline wake region of a high speed, twin screw surface vessel. Approximately 30,000 surface velocity realizations within the wake region extending from the stern to approximately six model ship lengths aft are used for comparison with both recent full-scale and numerical model results. Analysis of this data set reveals spatial decay rates in the mean and fluctuating velocity components which serve to identify relevant scales of motion and define candidate mechanisms for the persistence of these wakes in remotely sensed ocean surface data. C1 USN,RES LAB,WASHINGTON,DC 20375. RP MEADOWS, L (reprint author), UNIV MICHIGAN,DEPT NAVAL ARCHITECTURE & MARINE ENGN,ANN ARBOR,MI 48109, USA. NR 10 TC 4 Z9 4 U1 0 U2 1 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0029-8018 J9 OCEAN ENG JI Ocean Eng. PD FEB PY 1994 VL 21 IS 2 BP 221 EP 242 DI 10.1016/0029-8018(94)90040-X PG 22 WC Engineering, Marine; Engineering, Civil; Engineering, Ocean; Oceanography SC Engineering; Oceanography GA MP018 UT WOS:A1994MP01800007 ER PT J AU FRANK, LA SIGWARTH, JB WILLIAMS, DJ ROELOF, EC MITCHELL, DG GOLD, RE KEATH, EP MAUK, BH MENG, CI CARPENTER, DL HULTQVIST, BK LUNDIN, RN SISCOE, GL WOLF, RA GORNEY, DJ SCHULZ, M MCCOMAS, DJ FUNSTEN, HO MOORE, KR SMITH, BW CRAVEN, JD CHIU, YT MEIER, RR SEELY, JF AF FRANK, LA SIGWARTH, JB WILLIAMS, DJ ROELOF, EC MITCHELL, DG GOLD, RE KEATH, EP MAUK, BH MENG, CI CARPENTER, DL HULTQVIST, BK LUNDIN, RN SISCOE, GL WOLF, RA GORNEY, DJ SCHULZ, M MCCOMAS, DJ FUNSTEN, HO MOORE, KR SMITH, BW CRAVEN, JD CHIU, YT MEIER, RR SEELY, JF TI IMAGERS FOR THE MAGNETOSPHERE, AURORA, AND PLASMASPHERE SO OPTICAL ENGINEERING LA English DT Article DE MAGNETOSPHERIC IMAGERY; ATMOSPHERIC REMOTE SENSING ID ENERGETIC NEUTRAL ATOMS; RING CURRENT; ATMOSPHERE; RADIATION; DENSITY; ION AB We present a small Explorer mission, Imagers for the Magnetosphere, Aurora, and Plasmasphere (IMAP), to provide the first global magnetospheric images that will allow a systematic study of major regions of the magnetosphere, their dynamics, and their interactions. The mission objective is to obtain simultaneous images of the inner magnetosphere (ring current and trapped particles), the plasmasphere, the aurora, and auroral upflowing ions. The instruments are (1) a Low Energy Neutral Particle Imager for imaging H and O atoms, separately, in the energy range of similar to 1 to 30 keV, in several energy passbands; (2) an Energetic Neutral Particle Imager for imaging H atoms in the energy range similar to 15 to 200 keV and, separately, O atoms in the energy range similar to 60 to 200 keV, each in several energy passbands; (3) an Extreme-Ultraviolet Imager to obtain images of the plasmasphere (the distribution of cold He+) by means of He+ (30.4 nm) emissions; and (4) a Far-Ultraviolet Imaging Monochromator to provide images of the aurora and the geocorona. All images will be obtained with time and spatial resolutions appropriate to the global and macroscale structures to be observed. IMAP promises new quantitative analyses that will provide great advances in insight and knowledge of global and macroscale magnetospheric parameters. The results expected from IMAP will provide the first large-scale visualization of the ring current, the trapped ion populations, the plasmasphere, and the upflowing auroral ion population. Such images, coupled with simultaneously obtained auroral images, will also provide the initial opportunity to globally interconnect these major magnetospheric regions. The time sequencing of IMAP images will also provide the initial large-scale visualization of magnetospheric dynamics, both in space and time. C1 JOHNS HOPKINS UNIV,APPL PHYS LAB,LAUREL,MD 20723. STANFORD UNIV,DEPT STARLAB ELECT ENGN,STANFORD,CA 94305. SWEDISH INST SPACE PHYS,S-98128 KIRUNA,SWEDEN. BOSTON UNIV,CTR SPACE PHYS,BOSTON,MA 02215. RICE UNIV,DEPT SPACE PHYS & ASTRON,HOUSTON,TX 77251. AEROSP CORP,CTR SPACE & ENVIRONM TECHNOL,LOS ANGELES,CA 90009. LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87544. UNIV ALASKA,INST GEOPHYS,FAIRBANKS,AK 99775. LOCKHEED PALO ALTO RES LABS,PALO ALTO,CA 94304. USN,RES LAB,EO HULBURT CTR SPACE RES,WASHINGTON,DC 20375. RP FRANK, LA (reprint author), UNIV IOWA,DEPT PHYS & ASTRON,IOWA CITY,IA 52242, USA. RI Meier, Robert/G-4749-2014; Funsten, Herbert/A-5702-2015; Mauk, Barry/E-8420-2017 OI Meier, Robert/0000-0001-8497-7115; Funsten, Herbert/0000-0002-6817-1039; Mauk, Barry/0000-0001-9789-3797 NR 55 TC 7 Z9 7 U1 0 U2 0 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 FEB PY 1994 VL 33 IS 2 BP 391 EP 408 DI 10.1117/12.155986 PG 18 WC Optics SC Optics GA MW892 UT WOS:A1994MW89200010 ER PT J AU MCCOY, RP DYMOND, KF FRITZ, GG THONNARD, SE MEIER, RR REGEON, PA AF MCCOY, RP DYMOND, KF FRITZ, GG THONNARD, SE MEIER, RR REGEON, PA TI SPECIAL SENSOR ULTRAVIOLET LIMB IMAGER - AN IONOSPHERIC AND NEUTRAL DENSITY PROFILER FOR THE DEFENSE-METEOROLOGICAL-SATELLITE-PROGRAM SATELLITES SO OPTICAL ENGINEERING LA English DT Article; Proceedings Paper CT SPIE Conference on Instrumentation for Magnetospheric Imagery CY JUL 21-22, 1992 CL SAN DIEGO, CA SP SOC PHOTO OPT INSTRUMENTAT ENGINEERS DE MAGNETOSPHERIC IMAGERY; ATMOSPHERIC REMOTE SENSING; ULTRAVIOLET SPECTROSCOPY ID DAYGLOW; MODEL AB The Naval Research Laboratory is developing a series of far- and extreme-ultraviolet spectrographs (800 to 1700 Angstrom) to measure altitude profiles of the ionospheric and thermospheric airglow from the U.S. Air Force Defense Meteorological Satellite Program's Block 5D3 satellites. These spectrographs, which comprise the Special Sensor Ultraviolet Limb Imager (SSULI), use a near-Wadsworth optical configuration with a mechanical grid collimator, concave grating, and linear array detector. To image the limb, SSULI employs a rotating planar SIC mirror that sweeps the field of view perpendicular to the limb of the Earth. in the primary operating mode, the mirror sweeps the instrument field of view through 17 deg to view tangent heights from about 50 to 750 km. The SSULI detectors use microchannel plate intensification and wedge-and-strip decoding anodes to resolve 256 pixels in wavelength dispersion. The detector is windowless and uses an o-ring sealed door to protect the CsI photocathode from exposure prior to insertion in orbit. The altitude distributions of the airglow measured by the SSULI sensors will be used to infer the altitude distributions of electrons and neutral species. At night, electron densities will be determined by measurement of ion recombination nightglow. Daytime electron densities will be obtained from measurements of multiple resonant scattering of O+ 834-Angstrom radiation produced primarily by photoionization excitation of atomic oxygen. Dayside neutral densities and temperatures will be inferred from the measurement of dayglow emissions from N-2 and O produced by photoelectron impact excitation. RP MCCOY, RP (reprint author), USN,RES LAB,CODE 7623,WASHINGTON,DC 20375, USA. RI Meier, Robert/G-4749-2014 OI Meier, Robert/0000-0001-8497-7115 NR 9 TC 40 Z9 42 U1 1 U2 5 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 FEB PY 1994 VL 33 IS 2 BP 423 EP 429 DI 10.1117/12.155904 PG 7 WC Optics SC Optics GA MW892 UT WOS:A1994MW89200013 ER PT J AU MCCOY, RP MEIER, RR WOLFRAM, KD PICONE, JM THONNARD, SE FRITZ, GG MORRILL, JS HARDIN, DA CHRISTENSEN, AB KAYSER, DC PRANKE, JB STRAUS, PR AF MCCOY, RP MEIER, RR WOLFRAM, KD PICONE, JM THONNARD, SE FRITZ, GG MORRILL, JS HARDIN, DA CHRISTENSEN, AB KAYSER, DC PRANKE, JB STRAUS, PR TI FAR-ULTRAVIOLET IMAGING SPECTROGRAPH AND SCANNING GRATING SPECTROMETERS FOR THE REMOTE-ATMOSPHERIC-AND-IONOSPHERIC-DETECTION-SYSTEM SO OPTICAL ENGINEERING LA English DT Article DE MAGNETOSPHERIC IMAGERY; ATMOSPHERIC REMOTE SENSING; ULTRAVIOLET SPECTROSCOPY; IONOSPHERIC REMOTE SENSING AB The Remote Atmospheric and Ionospheric Detection System (RAIDS) experiment is an optical remote sensing platform consisting of eight sensors, (spectrographs, spectrometers, and photometers) covering the wavelength range 550 to 8744 Angstrom. RAIDS employs a mechanical scan platform to view the Earth's limb and measure line-of-sight column emission from tangent altitudes from 50 to 750 km. These measurements provide vertical profiles of atmospheric dayglow and nightglow from the mesosphere to the upper regions of the F-region ionosphere. RAIDS will be flown on the National Oceanographic and Atmospheric Administration (NOAA) J weather satellite through the auspices of the U.S. Air Force Space Test Program, The RAIDS wavelength and altitude coverage allows remote sensing of the major and many minor constituents in the thermosphere and ionosphere. These measurements will be used as part of a proof of concept for remote sensing of ionospheric and neutral density profiles. The RAIDS database will be used to study composition, thermal structure, and couplings between the mesosphere, thermosphere, and ionosphere. RAIDS is a joint venture of the Naval Research Laboratory (NRL) and The Aerospace Corporation. We describe the subset of RAIDS instruments developed at NRL covering the far to near UV regions (1300 to 4000 Angstrom). C1 COMPUTAT PHYS INC,ANNANDALE,VA 22003. AEROSP CORP,CTR SPACE & ENVIRONM TECHNOL,LOS ANGELES,CA 90009. RP MCCOY, RP (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 3 TC 8 Z9 8 U1 0 U2 1 PU SOC PHOTO-OPT INSTRUM ENG PI BELLINGHAM PA PO BOX 10, BELLINGHAM, WA 98227-0010 SN 0091-3286 J9 OPT ENG JI Opt. Eng. PD FEB PY 1994 VL 33 IS 2 BP 430 EP 437 DI 10.1117/12.155905 PG 8 WC Optics SC Optics GA MW892 UT WOS:A1994MW89200014 ER PT J AU KORENDYKE, CM PRINZ, DK SOCKER, DG AF KORENDYKE, CM PRINZ, DK SOCKER, DG TI OPTICAL DESIGN OF A NEAR-ULTRAVIOLET CORONAGRAPH FOR A SOUNDING ROCKET PLATFORM SO OPTICAL ENGINEERING LA English DT Article DE CORONA; FABRY-PEROT INTERFEROMETERS; CORONAGRAPH; STRAY LIGHT AB The near-UV (190 to 270 nm) coronal emission lines present a unique opportunity to observe heliospheric plasmas between one and two solar radii. The near-UV coronagraph was specifically designed to obtain observations in these lines from a sounding rocket platform. The design demonstrates that high-resolution, two-dimensional coronal observations in the near-UV are readily achievable within the practical constraints of a sounding rocket. The near-UV coronagraph consists of a reflective, coronagraph telescope followed by an imaging channeled spectrograph. The telescope includes a Lyot stop and an occulter to minimize instrumentally scattered disk radiation. The choice of a mirror objective gives rise to a compact, achromatic telescope with excellent off-axis rejection and good imaging properties. The focal plane package combines a Fabry-Perot interferometer with a tandem Wadsworth spectrograph to produce a channeled spectrum consisting of a series of two-dimensional (25 x 500 arcsec), narrow-bandpass (similar to 0.1 Angstrom) images at the instrument focal plane. The instrument will produce a number of high-spatial-resolution (< 1 arcsec) coronal images in a single flight. RP KORENDYKE, CM (reprint author), USN,RES LAB,EO HULBURT CTR SPACE RES,4555 OVERLOOK AVE,WASHINGTON,DC 20375, USA. NR 12 TC 0 Z9 0 U1 0 U2 0 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 FEB PY 1994 VL 33 IS 2 BP 479 EP 483 DI 10.1117/12.152194 PG 5 WC Optics SC Optics GA MW892 UT WOS:A1994MW89200021 ER PT J AU FABINY, L VOHRA, ST BUCHOLTZ, F DANDRIDGE, A AF FABINY, L VOHRA, ST BUCHOLTZ, F DANDRIDGE, A TI 3-CHANNEL LOW-FREQUENCY FIBEROPTIC VOLTAGE SENSOR SO OPTICS LETTERS LA English DT Article AB We demonstrate a frequency-multiplexed three-channel fiber-optic interferometric dc and low-frequency voltage sensor based on the electrostrictive effect in lead magnesium niobate transducers. The sensor relies on the nonlinear transduction mechanism in electrostrictive materials for frequency-division multiplexing by use of a single interferometer and a single unmodulated laser. To our knowledge this is the first direct measurement of three low-frequency voltage signals with a single fiber-optic interferometer. Demonstrated cross talk between channels is less than -75 dB. The cross talk is shown to be caused by the nonlinear output of the interferometer at large applied strains. RP FABINY, L (reprint author), USN,RES LAB,DIV OPT SCI,CODE 5670,WASHINGTON,DC 20375, USA. NR 7 TC 4 Z9 4 U1 0 U2 0 PU OPTICAL SOC AMER PI WASHINGTON PA 2010 MASSACHUSETTS AVE NW, WASHINGTON, DC 20036 SN 0146-9592 J9 OPT LETT JI Opt. Lett. PD FEB 1 PY 1994 VL 19 IS 3 BP 228 EP 230 DI 10.1364/OL.19.000228 PG 3 WC Optics SC Optics GA MT963 UT WOS:A1994MT96300026 PM 19829600 ER PT J AU WASFY, MO MCMAHON, KT SANTOS, AC MINAH, GE FALKLER, WA LLOYD, DR AF WASFY, MO MCMAHON, KT SANTOS, AC MINAH, GE FALKLER, WA LLOYD, DR TI USE OF THE SYRIAN GOLDEN-HAMSTER FOR THE INDUCTION OF INTRAORAL ABSCESSES BY SUTURES CONTAMINATED WITH HUMAN SUBGINGIVAL PLAQUE SO ORAL MICROBIOLOGY AND IMMUNOLOGY LA English DT Article DE HAMSTER ORAL FLORA; ANIMAL MODEL; ORAL INFECTION; PORPHYROMONAS-GINGIVALIS; PREVOTELLA-INTERMEDIA ID INFECTIONS; VIRULENCE; BACTERIA; RATS; MICE AB Analysis of normal oral flora in 150 cheek pouches of hamsters (Mesocricetus auratus) defined the microbial working environment and demonstrated the absence of human oral black-pigmented bacteria. Silk sutures saturated with Porphyromonas gingivalis, Prevotella intermedia or subgingival plaque were used to close wounds made in hamster's cheek pouches. Abscesses were formed when sutures had solitary P. gingivalis or other bacteria mixed with P. gingivalis or when P. intermedia was mixed with other bacteria besides P. gingivalis. A concentration of black-pigmented bacteria emanating from 3 x 10(5) colony-forming units/inoculum was required for abscess formation. Six abscesses (14.3%) were developed in association with the presence of other odontopathic bacteria, primarily Fusobacterium nucleatum and Actinomyces viscosus. The hamster cheek pouch with iatrogenic wounds closed with plaque-impregnated sutures is a novel and effective model to study the pathology of wound infections and virulence of human subgingival organisms. C1 USN,MED RES UNIT 3,DIV DENT RES,CAIRO,EGYPT. UNIV MARYLAND,SCH DENT,BALTIMORE,MD 21201. RP WASFY, MO (reprint author), USN,MED RES UNIT 3,RES PUBLICAT BRANCH,PSC 452 BOX 5000,FPO,AE 09835, USA. NR 26 TC 3 Z9 3 U1 0 U2 0 PU MUNKSGAARD INT PUBL LTD PI COPENHAGEN PA 35 NORRE SOGADE, PO BOX 2148, DK-1016 COPENHAGEN, DENMARK SN 0902-0055 J9 ORAL MICROBIOL IMMUN JI Oral Microbiol. Immunol. PD FEB PY 1994 VL 9 IS 1 BP 50 EP 54 DI 10.1111/j.1399-302X.1994.tb00214.x PG 5 WC Dentistry, Oral Surgery & Medicine; Immunology; Microbiology SC Dentistry, Oral Surgery & Medicine; Immunology; Microbiology GA MU095 UT WOS:A1994MU09500008 PM 7478755 ER PT J AU COLETTA, PE AF COLETTA, PE TI MACARTHUR ULTRA CODEBREAKING AND THE WAR AGAINST JAPAN, 1942-1945 - DREA,EJ SO PACIFIC HISTORICAL REVIEW LA English DT Book Review RP COLETTA, PE (reprint author), USN ACAD,ANNAPOLIS,MD 21402, USA. NR 1 TC 0 Z9 0 U1 0 U2 0 PU UNIV CALIF PRESS PI BERKELEY PA JOURNALS DEPT 2120 BERKELEY WAY, BERKELEY, CA 94720 SN 0030-8684 J9 PAC HIST REV JI Pac. Hist. Rev. PD FEB PY 1994 VL 63 IS 1 BP 118 EP 119 PG 2 WC History SC History GA NA164 UT WOS:A1994NA16400035 ER PT J AU JACOBSEN, RL TRITT, TM EHRLICH, AC GILLESPIE, DJ AF JACOBSEN, RL TRITT, TM EHRLICH, AC GILLESPIE, DJ TI TEMPERATURE-DEPENDENCE OF ELASTIC PROPERTIES OF TASE3 SO PHYSICA B LA English DT Article; Proceedings Paper CT 20th International Conference on Low Temperature Physics CY AUG 04-11, 1993 CL EUGENE, OR SP INT UNION PURE & APPL PHYS, AMER PHYS SOC, CITY EUGENE, INT INST REFRIGERAT, INT SCI FDN, JET PROPULS LABS, NATL SCI FDN, USN, OFF NAVAL RES, OXFORD INSTRUMENTS INC, TEKTRONIX INC, UNIV OREGON AB We discuss vibrating-reed measurements of Young's modulus and internal friction of TaSe3, as a function of temperature from 50-310 K. The modulus is found to increase with temperature, in a nearly linear fashion, by more than 10% over the this range. Such behavior is inconsistent with the most common elementary theories of the effect of temperature on modulus, and unique within the authors' experience. RP JACOBSEN, RL (reprint author), USN,RES LAB,MAT PHYS BRANCH,WASHINGTON,DC 20375, USA. NR 12 TC 0 Z9 0 U1 1 U2 7 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0921-4526 J9 PHYSICA B JI Physica B PD FEB PY 1994 VL 194 BP 429 EP 430 DI 10.1016/0921-4526(94)90544-4 PN 1 PG 2 WC Physics, Condensed Matter SC Physics GA NB789 UT WOS:A1994NB78900218 ER PT J AU SOULEN, RJ AF SOULEN, RJ TI EXPECTED PERFORMANCE OF A RADIOFREQUENCY BIASED R-SQUID NOISE THERMOMETER BELOW 6-MK SO PHYSICA B LA English DT Article; Proceedings Paper CT 20th International Conference on Low Temperature Physics CY AUG 04-11, 1993 CL EUGENE, OR SP INT UNION PURE & APPL PHYS, AMER PHYS SOC, CITY EUGENE, INT INST REFRIGERAT, INT SCI FDN, JET PROPULS LABS, NATL SCI FDN, USN, OFF NAVAL RES, OXFORD INSTRUMENTS INC, TEKTRONIX INC, UNIV OREGON AB The noise and circuit impedance of an R-SQUID noise thermometer (i.e., a circuit composed of a Josephson junction shunted by a resistor R) have been extensively studied as a function of the applied rf and dc bias currents. Over the temperature range studied (6.3 mK to 740 mK), the noise and impedance were fit very well by predictions of the Resistively-Shunted Junction (RSJ) model and the R-SQUID was used to successfully define an absolute temperature scale over this range. On the basis of these results, the performance of the noise thermometer is evaluated at lower temperatures, particularly at the fixed points defined by the phase diagram of He-3. It is concluded that the R-SQUID should be capable of defining such temperatures down to 1 mK with an accuracy to approximately 0.1%. RP SOULEN, RJ (reprint author), USN,RES LAB,CODE 6344,WASHINGTON,DC 20375, USA. NR 3 TC 0 Z9 0 U1 1 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0921-4526 J9 PHYSICA B JI Physica B PD FEB PY 1994 VL 194 BP 817 EP 818 DI 10.1016/0921-4526(94)90738-2 PN 1 PG 2 WC Physics, Condensed Matter SC Physics GA NB789 UT WOS:A1994NB78900412 ER PT J AU GHOSH, RN WILLIAMS, ER CLARK, AF SOULEN, RJ AF GHOSH, RN WILLIAMS, ER CLARK, AF SOULEN, RJ TI CRYOGENIC PRECISION CAPACITANCE BRIDGE USING A SINGLE-ELECTRON TUNNELING ELECTROMETER SO PHYSICA B LA English DT Article; Proceedings Paper CT 20th International Conference on Low Temperature Physics CY AUG 04-11, 1993 CL EUGENE, OR SP INT UNION PURE & APPL PHYS, AMER PHYS SOC, CITY EUGENE, INT INST REFRIGERAT, INT SCI FDN, JET PROPULS LABS, NATL SCI FDN, USN, OFF NAVAL RES, OXFORD INSTRUMENTS INC, TEKTRONIX INC, UNIV OREGON AB The electronic charge can be determined by placing a known number of electrons on a calibrated capacitor and measuring the resulting voltage. Single electron tunneling (SET) electrometers with sufficient sensitivity for this application have been fabricated. We report on the design and preliminary results of a capacitance bridge experiment using an SET electrometer to measure two capacitors in a dilution refrigerator. This includes discussion of issues such as the leakage rate of a capacitor at cryogenic temperatures and the optimum coupling of the electrometer to the bridge circuit. C1 USN,RES LAB,WASHINGTON,DC 20375. RP GHOSH, RN (reprint author), NATL INST STAND & TECHNOL,DIV ELECT,GAITHERSBURG,MD 20899, USA. 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 0921-4526 J9 PHYSICA B JI Physica B PD FEB PY 1994 VL 194 BP 1007 EP 1008 DI 10.1016/0921-4526(94)90833-8 PN 1 PG 2 WC Physics, Condensed Matter SC Physics GA NB789 UT WOS:A1994NB78900507 ER PT J AU MCQUEEN, PG HESS, DW SERENE, JW AF MCQUEEN, PG HESS, DW SERENE, JW TI FORMATION OF A PSEUDOGAP IN THE 2D SYMMETRICAL ANDERSON LATTICE MODEL SO PHYSICA B LA English DT Article; Proceedings Paper CT 20th International Conference on Low Temperature Physics CY AUG 04-11, 1993 CL EUGENE, OR SP INT UNION PURE & APPL PHYS, AMER PHYS SOC, CITY EUGENE, INT INST REFRIGERAT, INT SCI FDN, JET PROPULS LABS, NATL SCI FDN, USN, OFF NAVAL RES, OXFORD INSTRUMENTS INC, TEKTRONIX INC, UNIV OREGON AB We calculated the spin susceptibility and self-energy for the 2D symmetric Anderson lattice model in a conserving approximation. The susceptibility rises with decreasing temperature to reach a maximum and then drops abruptly, and the density of states shows a crossover from metallic behavior at high temperatures to insulating behavior at low temperatures. RP MCQUEEN, PG (reprint author), USN,RES LAB,COMPLEX SYST THEORY BRANCH,4555 OVERLOOK AVE SW,WASHINGTON,DC 20375, USA. NR 7 TC 1 Z9 1 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0921-4526 J9 PHYSICA B JI Physica B PD FEB PY 1994 VL 194 BP 1169 EP 1170 DI 10.1016/0921-4526(94)90914-8 PN 1 PG 2 WC Physics, Condensed Matter SC Physics GA NB789 UT WOS:A1994NB78900588 ER PT J AU TRITT, TM JACOBSEN, RL EHRLICH, AC GILLESPIE, DJ AF TRITT, TM JACOBSEN, RL EHRLICH, AC GILLESPIE, DJ TI MEASURE OF THE ELASTIC AND TRANSPORT-PROPERTIES OF TASE3 THROUGH THE STRESS-INDUCED PHASE-TRANSITION SO PHYSICA B LA English DT Article; Proceedings Paper CT 20th International Conference on Low Temperature Physics CY AUG 04-11, 1993 CL EUGENE, OR SP INT UNION PURE & APPL PHYS, AMER PHYS SOC, CITY EUGENE, INT INST REFRIGERAT, INT SCI FDN, JET PROPULS LABS, NATL SCI FDN, USN, OFF NAVAL RES, OXFORD INSTRUMENTS INC, TEKTRONIX INC, UNIV OREGON AB It is known that a stress-induced phase transition exists in TaSe3.[1, 2] We have simultaneously measured the stress, strain and resistance in TaSe3 samples through this phase transition. We have performed these measurements over a range of temperature from 25K to 300K We have also evaluated Young's modulus, Y, over this same range and find values which are comparable with those obtained for TaS3 and NbSe3. The modulus appears to have two levels; a high stress and low stress value which is consistent with the origin of the transition being structural in nature. The dramatic electronic properties that this material exhibits under stress are discussed in terms of this structural transition. RP TRITT, TM (reprint author), USN,RES LAB,MAT PHYS BRANCH,WASHINGTON,DC 20375, USA. NR 9 TC 1 Z9 1 U1 1 U2 6 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0921-4526 J9 PHYSICA B JI Physica B PD FEB PY 1994 VL 194 BP 1303 EP 1304 DI 10.1016/0921-4526(94)90981-4 PN 1 PG 2 WC Physics, Condensed Matter SC Physics GA NB789 UT WOS:A1994NB78900655 ER PT J AU HESS, DW AF HESS, DW TI A VORTEX CORE TRANSITION IN AN UNCONVENTIONAL SUPERCONDUCTOR SO PHYSICA B LA English DT Article; Proceedings Paper CT 20th International Conference on Low Temperature Physics CY AUG 04-11, 1993 CL EUGENE, OR SP INT UNION PURE & APPL PHYS, AMER PHYS SOC, CITY EUGENE, INT INST REFRIGERAT, INT SCI FDN, JET PROPULS LABS, NATL SCI FDN, USN, OFF NAVAL RES, OXFORD INSTRUMENTS INC, TEKTRONIX INC, UNIV OREGON ID UNCONVENTIONAL SUPERCONDUCTOR; BROKEN SYMMETRY; UPT3; VORTICES AB I show that a weak symmetry breaking field coupled to an unconventional superconducting order parameter proposed to describe UPt3 induces a phase transition between two vortex states. RP HESS, DW (reprint author), USN,RES LAB,COMPLEX SYST THEORY BRANCH,4555 OVERLOOK AVE SW,WASHINGTON,DC 20375, USA. NR 11 TC 1 Z9 1 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0921-4526 J9 PHYSICA B JI Physica B PD FEB PY 1994 VL 194 BP 1419 EP 1420 DI 10.1016/0921-4526(94)91209-2 PN 2 PG 2 WC Physics, Condensed Matter SC Physics GA NC275 UT WOS:A1994NC27500034 ER PT J AU JANG, KW MELTZER, RS GANEM, J AF JANG, KW MELTZER, RS GANEM, J TI PERSISTENT UV-INDUCED OPTICAL DEPHASING IN PR-DOPED YTTRIUM-ALUMINUM-GARNET SO PHYSICAL REVIEW B LA English DT Article ID PHOTON-ECHO EXPERIMENTS; MECHANICAL-PROPERTIES; TEMPERATURE-DEPENDENCE; SINGLE-CRYSTALS; 2-LEVEL SYSTEMS; PHOSPHORS; SILICON; ABSORPTION; INTENSITY; Y3AL5O12 AB Intensity-dependent optical dephasing is shown to arise from nonresonant excitation of 1% Pr3+ doped yttrium aluminum garnet (YAG) with UV radiation between 325-355 nm. UV irradiation of the sample with intensities greater than 30 MW/cm(2) produces persistent changes in the optical dephasing. Two-pulse photon echo decays on the H-3(4)-->D-1(2) transition of pr(3+) were measured at 1.5 K before and after exposure to UV radiation. Changes persisting for at least several hours are observed in the echo intensity, echo decay rate, and temporal form of the echo decay. Changes persist if the sample is kept below 10 K, but warming to 77 K results in the echo decays resuming their initial intensity and duration. No change is detected in the optical absorption spectrum of the Pr3+ ions after UV exposure, indicating that most of the ions remain in that charge state. Although the mechanism giving rise to the increased optical dephasing is not completely understood, the additional dynamics may arise from the UV radiation freeing electrons that become trapped in lattice defects. The presence of the dephasing at low temperatures indicates the availability of low-energy excitations of the electronic system. C1 USN,RES LAB,LASER PHYS BRANCH,WASHINGTON,DC 20375. RP JANG, KW (reprint author), UNIV GEORGIA,DEPT PHYS & ASTRON,ATHENS,GA 30602, USA. NR 24 TC 0 Z9 0 U1 0 U2 5 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD FEB 1 PY 1994 VL 49 IS 5 BP 3009 EP 3014 DI 10.1103/PhysRevB.49.3009 PG 6 WC Physics, Condensed Matter SC Physics GA MW349 UT WOS:A1994MW34900001 ER PT J AU QUONG, AA AF QUONG, AA TI FIRST-PRINCIPLES DETERMINATION OF THE INTERATOMIC-FORCE-CONSTANT TENSOR OF AU SO PHYSICAL REVIEW B LA English DT Article ID ABINITIO CALCULATION; PHONON DISPERSIONS; LATTICE-DYNAMICS; LINEAR-RESPONSE AB Using the plane-wave-based linear response method recently developed, the interatomic-force-constant tensor for the noble metal Au is obtained. Using an optimized pseudopotential to model the ion-electron interaction requires only a modest number of plane waves, and the calculated phonon dispersion curves are in excellent agreement with experiment. The force constant tenser is studied in detail and is compared with those obtained from Born-Von Karman fits to the experimental Excellent agreement with experiment is found when the range of interaction is taken to fourth neighbors, however, longer-ranged interactions need to be included to accurately determine the lattice specific heat. C1 NAVAL RES LAB,COMPLEX SYST THEORY BRANCH,WASHINGTON,DC 20375. NR 17 TC 20 Z9 20 U1 1 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 FEB 1 PY 1994 VL 49 IS 5 BP 3226 EP 3229 DI 10.1103/PhysRevB.49.3226 PG 4 WC Physics, Condensed Matter SC Physics GA MW349 UT WOS:A1994MW34900031 ER PT J AU SASLOW, WM KOON, NC AF SASLOW, WM KOON, NC TI RANDOM-ANISOTROPY MODEL - MONOTONIC DEPENDENCE OF THE COERCIVE FIELD ON D/J SO PHYSICAL REVIEW B LA English DT Article ID SPIN-GLASS; MAGNETIZATION; MAGNETS; FERROMAGNET; TRANSITION; SYMMETRY; PHASE AB We present the results of a numerical study of the sere-temperature remanence and coercivity for the random anisotropy model (RAM), showing that, contrary to early calculations for this model, the coercive field increases monotonically with increases in the strength D of the random anisotropy relative to the strength J of the exchange field. Local-field adjustments with and without spin hips are considered. Convergence is difficult to obtain for small values of the anisotropy, suggesting that this is the likely source of the nonmonotonic behavior found in earlier studies. For both large and small anisotropy, each spin undergoes about one hip per hysteresis cycle, and about half of the spin hips occur in the vicinity of the coercive field. When only non-spin-hip adjustments are considered, at large anisotropy the coercivity is proportional to the anisotropy. At small anisotropy, the rate of convergence is comparable to that when spin hips are included. C1 USN,RES LAB,WASHINGTON,DC 20375. RP SASLOW, WM (reprint author), TEXAS A&M UNIV,CTR THEORET PHYS,DEPT PHYS,COLL STN,TX 77843, USA. NR 25 TC 7 Z9 7 U1 1 U2 1 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD FEB 1 PY 1994 VL 49 IS 5 BP 3386 EP 3390 DI 10.1103/PhysRevB.49.3386 PG 5 WC Physics, Condensed Matter SC Physics GA MW349 UT WOS:A1994MW34900049 ER PT J AU HARRIS, VG ELAM, WT KOON, NC HELLMAN, F AF HARRIS, VG ELAM, WT KOON, NC HELLMAN, F TI DEPOSITION-TEMPERATURE DEPENDENCE OF STRUCTURAL ANISOTROPY IN AMORPHOUS TB-FE FILMS SO PHYSICAL REVIEW B LA English DT Note ID MAGNETIC-ANISOTROPY; METALLIC FILMS; THIN-FILMS AB The anisotropic local structure in a series of amorphous Tb26Fe74 films deposited at different deposition temperatures and having different magnetic anisotropy energies have been investigated using polarization-dependent extended x-ray-absorption fine-structure measurements. Samples deposited at temperatures greater than or equal to 300 K exhibit anisotropic pair correlations where like atomic pairs are favored in plane and unlike pairs are favored out of plane. Both the anisotropic pair correlations and the perpendicular magnetic anisotropy increase with increasing deposition temperature. In contrast, a sample deposited at 77 K was found to have isotropic pair correlations, low perpendicular magnetic anisotropy, and a large (approximate to 1%) in-plane compression. C1 UNIV CALIF SAN DIEGO,LA JOLLA,CA 92093. RP HARRIS, VG (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. RI Harris, Vincent/A-8337-2009 NR 19 TC 23 Z9 24 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 FEB 1 PY 1994 VL 49 IS 5 BP 3637 EP 3640 DI 10.1103/PhysRevB.49.3637 PG 4 WC Physics, Condensed Matter SC Physics GA MW349 UT WOS:A1994MW34900093 ER PT J AU KRESIN, VZ WOLF, SA AF KRESIN, VZ WOLF, SA TI MICROSCOPIC MODEL FOR THE ISOTOPE EFFECT IN THE HIGH-T-C OXIDES SO PHYSICAL REVIEW B LA English DT Note ID OXYGEN; SUPERCONDUCTIVITY; YBA2CU3O7-DELTA; TRANSITION AB An unconventional microscopic mechanism relating T-c and the isotope substitution for the doped superconductors such as the high-T-c oxides is proposed. Strong nonadiabaticity, when it is impossible, strictly speaking, to separate fully the nuclear and electronic degrees of freedom, leads to a peculiar dependence of the carrier concentration n on the ionic mass M. This case corresponds, for example, to the isotopic substitution of the axial oxygen in YBa2Cu3O7-x. Because of the dependence of T-c on n, this leads to the dependence of T-c on M, that is to the isotope effect. The minimum value of the isotope coefficient corresponds to T-c=T-c(max). C1 USN,RES LAB,WASHINGTON,DC 20375. RP KRESIN, VZ (reprint author), UNIV CALIF BERKELEY,LAWRENCE BERKELY LAB,BERKELEY,CA, USA. RI Wolf, Stuart/A-7513-2009 NR 27 TC 54 Z9 54 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 FEB 1 PY 1994 VL 49 IS 5 BP 3652 EP 3654 DI 10.1103/PhysRevB.49.3652 PG 3 WC Physics, Condensed Matter SC Physics GA MW349 UT WOS:A1994MW34900097 ER PT J AU HEAGY, JF PLATT, N HAMMEL, SM AF HEAGY, JF PLATT, N HAMMEL, SM TI CHARACTERIZATION OF ON-OFF INTERMITTENCY SO PHYSICAL REVIEW E LA English DT Article ID TRANSITION; SYSTEMS; NOISE; EQUATIONS; CRISIS; CHAOS AB The recently reported behavior known as ''on-off intermittency'' [N. Platt, E. A. Spiegel, and C. Tresser, Phys. Rev. Lett. 70, 279 (1993)] is investigated in a class of one-dimensional maps that are multiplicatively coupled to either random or chaotic signals. Specific attention is paid to the conditions for the onset of intermittent behavior, the distribution of laminar phases, and the mean laminar phase as a function of the coupling strength. An exact expression is obtained for the distribution of laminar phases in the case of uniformly distributed random driving. A universal asymptotic -3/2 power-law distribution is proven to hold for a large class of random driving cases. Power-law scaling of the mean laminar phase as a function of coupling strength near onset is predicted for random driving, with a critical exponent of -1. Numerical studies with chaotically driven maps reveal similar behavior to random driving cases and suggest the need for a systematic study of ''chaotic walks.'' C1 USN, CTR SURFACE WARFARE, SILVER SPRING, MD 20903 USA. RP USN, RES LAB, WASHINGTON, DC 20375 USA. NR 23 TC 365 Z9 369 U1 2 U2 8 PU AMER PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 2470-0045 EI 2470-0053 J9 PHYS REV E JI Phys. Rev. E PD FEB PY 1994 VL 49 IS 2 BP 1140 EP 1150 DI 10.1103/PhysRevE.49.1140 PG 11 WC Physics, Fluids & Plasmas; Physics, Mathematical SC Physics GA NA921 UT WOS:A1994NA92100034 ER PT J AU ELTON, RC BILLINGS, DM MANKA, CK GRIEM, HR GRUN, J RIPIN, BH RESNICK, J AF ELTON, RC BILLINGS, DM MANKA, CK GRIEM, HR GRUN, J RIPIN, BH RESNICK, J TI SPECTROSCOPIC DIAGNOSTICS IN A COLLIDING-BLAST-WAVE EXPERIMENT SO PHYSICAL REVIEW E LA English DT Article ID LASER-PRODUCED PLASMA AB Visible spectral lines from n = 3, DELTAn = 0 transitions in N+ and N2+ ions are used for measuring the plasma electron density and temperature in a region of two colliding blast waves, propagating through a 1.5-10-Torr nitrogen atmosphere. The blast waves originate at the tips of two aluminum rods irradiated with two beams of the Naval Research Laboratory (NRL) Pharos-III 1.054-mum-wavelength Nd:glass laser operated at an energy of 200-430 J for each beam in 5-ns pulses. An electron density in the colliding-blast-wave region of N(e) almost-equal-to 10(18) cm-3 was deduced from Stark broadening of spectral lines from N+ ions. An electron temperature of T(e) almost-equal-to 4 eV was measured in this region from a spectral-line intensity ratio between N2+ and N+ ions. Near one target, an electron density of N(e) almost-equal-to 8 X 10(20) cm-3 was determined from series-limit x-ray spectral-line merging; a mean electron temperature of kT(e) almost-equal-to 225 eV was determined from x-ray fine-intensity ratios. Some evidence was found for enhanced velocities for blast waves propagating through a plasma formed by a preceding blast wave. C1 RES SUPPORT INSTRUMENTS INC,ALEXANDRIA,VA 22314. RP ELTON, RC (reprint author), USN,RES LAB,DIV PLASMA PHYS,WASHINGTON,DC 20375, USA. NR 20 TC 12 Z9 12 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1063-651X J9 PHYS REV E JI Phys. Rev. E PD FEB PY 1994 VL 49 IS 2 BP 1512 EP 1519 DI 10.1103/PhysRevE.49.1512 PG 8 WC Physics, Fluids & Plasmas; Physics, Mathematical SC Physics GA NA921 UT WOS:A1994NA92100075 ER PT J AU THORNHILL, JW WHITNEY, KG DEENEY, C LEPELL, PD AF THORNHILL, JW WHITNEY, KG DEENEY, C LEPELL, PD TI PHENOMENOLOGICAL MODELING OF TURBULENCE IN Z-PINCH IMPLOSIONS SO PHYSICS OF PLASMAS LA English DT Article ID X-RAY-EMISSION; WIRE-ARRAY IMPLOSIONS; ATOMIC-NUMBER; PLASMAS; GENERATORS AB A phenomenological investigation into the effects of magnetohydrodynamic (MHD) turbulence on the initial stagnation dynamics of aluminum wire array and argon gas puff Z-pinch implosions is performed. The increases that turbulence produces in the plasma viscosity, heat conductivity, and electrical resistivity are modeled by using multipliers for these quantities in one-dimensional (1-D) MHD calculations. The major effect of these increases is to soften the 1-D implosions by decreasing the densities that are achieved on axis at stagnation. As a consequence, a set of multipliers can be found that reasonably duplicates the average electron temperatures, ion densities, and mass of the K-shell emission region that were measured at stagnation for a variety of Physics International aluminum wire array and argon gas puff experiments. It is determined that the dependence of these measured;quantities on the multipliers is weak once a level of enhancement is reached, where agreement between calculations and experiments is attained. The scaling of K-shell yield with load mass for a fixed implosion velocity is then reexamined, and the minimum load mass needed to efficiently produce K-shell emission by thermalization of kinetic energy is calculated for aluminum and argon using this phenomenological soft implosion modeling. The results show an upward shift in the minimum mass by a factor of 6 when compared to the original nonturbulent hard implosion calculations. C1 PHYS INT INC,SAN LEANDRO,CA 94577. RP THORNHILL, JW (reprint author), USN,RES LAB,DIV PLASMA PHYS,WASHINGTON,DC 20375, USA. NR 36 TC 65 Z9 67 U1 0 U2 0 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 1070-664X J9 PHYS PLASMAS JI Phys. Plasmas PD FEB PY 1994 VL 1 IS 2 BP 321 EP 330 DI 10.1063/1.870834 PG 10 WC Physics, Fluids & Plasmas SC Physics GA MY298 UT WOS:A1994MY29800012 ER PT J AU SKELTON, EF AF SKELTON, EF TI A RECORD-BREAKING SUPERCONDUCTOR, MISSED SO PHYSICS TODAY LA English DT Letter RP SKELTON, EF (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 2 TC 0 Z9 0 U1 0 U2 0 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0031-9228 J9 PHYS TODAY JI Phys. Today PD FEB PY 1994 VL 47 IS 2 BP 120 EP 121 DI 10.1063/1.2808421 PG 2 WC Physics, Multidisciplinary SC Physics GA NA808 UT WOS:A1994NA80800019 ER PT J AU ALBERTE, RS SUBA, GK PROCACCINI, G ZIMMERMAN, RC FAIN, SR AF ALBERTE, RS SUBA, GK PROCACCINI, G ZIMMERMAN, RC FAIN, SR TI ASSESSMENT OF GENETIC DIVERSITY OF SEAGRASS POPULATIONS USING DNA-FINGERPRINTING - IMPLICATIONS FOR POPULATION STABILITY AND MANAGEMENT SO PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA LA English DT Article DE HYPERVARIABLE MINISATELLITE DNA; EELGRASS; POPULATION GENETICS; GENE FLOW; MARINE MACROPHYTE ID ZOSTERA-MARINA L; CHESAPEAKE BAY; L EELGRASS; DECLINE; GROWTH AB Populations of the temperate seagrass, Zostera marina L. (eelgrass), often exist as discontinuous beds in estuaries, harbors, and bays where they can reproduce sexually or vegetatively through clonal propagation. We examined the genetic structure of three geographically and morphologically distinct populations from central California (Elkhorn Slough, Tomales Bay, and Del Monte Beach), using multilocus restriction fragment length polymorphisms (DNA fingerprints). Within-population genetic similarity (S(w)) values for the three eelgrass populations ranged from 0.44 to 0.68. The Tomales Bay population located in an undisturbed, littoral site possessed a within-population genetic similarity (S(w) = 0.44) that was significantly lower than those of the other two populations. Cluster analysis identified genetic substructure in only the undisturbed subtidal population (Del Monte Beach). Between-population similarity values (S(b)) for all pairwise comparisons ranged from 0.47 to 0.51. The three eelgrass populations show significantly less between locale genetic similarity than found within populations, indicating that gene flow is restricted between locales even though two of the populations are separated by only 30 km. The study demonstrates that (i) natural populations of Z. marina from both disturbed and undisturbed habitats possess high genetic diversity and are not primarily clonal, (ii) gene flow is restricted even between populations in dose proximity, (iii) an intertidal population from a highly disturbed habitat shows much lower genetic diversity than an intertidal population from an undisturbed site, and (iv) DNA fingerprinting techniques can be exploited to understand gene flow and population genetic structure in Z. marina, a widespread and ecologically important species, and as such are relevant to the management of this coastal resource. C1 STAZ ZOOL ANTON DOHRN, LAB ECOL BENTHOS, I-80077 ISCHIA, ITALY. US FISH & WILDLIFE SERV, NAT FORENS LAB, ASHLAND, OR 97520 USA. UNIV CALIF LOS ANGELES, LOS ANGELES, CA 90024 USA. RP ALBERTE, RS (reprint author), OFF NAVAL RES, MOLEC CELL & ENVIRONM BIOL PROGRAM, ARLINGTON, VA 22217 USA. RI Procaccini, Gabriele/A-6618-2010 OI Procaccini, Gabriele/0000-0002-6179-468X NR 34 TC 77 Z9 78 U1 2 U2 9 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 FEB 1 PY 1994 VL 91 IS 3 BP 1049 EP 1053 DI 10.1073/pnas.91.3.1049 PG 5 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA MV278 UT WOS:A1994MV27800047 PM 11607458 ER PT J AU XAPSOS, MA BURKE, EA SHAPIRO, P SUMMERS, GP AF XAPSOS, MA BURKE, EA SHAPIRO, P SUMMERS, GP TI ENERGY DEPOSITION AND IONIZATION FLUCTUATIONS INDUCED BY IONS IN SMALL SITES - AN ANALYTICAL APPROACH SO RADIATION RESEARCH LA English DT Article ID CHORD-LENGTH DISTRIBUTIONS; MICRODOSIMETRIC DISTRIBUTIONS C1 SFA INC,LANDOVER,MD 20785. UNIV MARYLAND,DEPT PHYS,BALTIMORE,MD 21228. RP XAPSOS, MA (reprint author), USN,RES LAB,RADIAT EFFECTS BRANCH,WASHINGTON,DC 20375, USA. NR 35 TC 14 Z9 14 U1 0 U2 4 PU RADIATION RESEARCH SOC PI OAK BROOK PA 2021 SPRING RD, STE 600, OAK BROOK, IL 60521 SN 0033-7587 J9 RADIAT RES JI Radiat. Res. PD FEB PY 1994 VL 137 IS 2 BP 152 EP 161 DI 10.2307/3578806 PG 10 WC Biology; Biophysics; Radiology, Nuclear Medicine & Medical Imaging SC Life Sciences & Biomedicine - Other Topics; Biophysics; Radiology, Nuclear Medicine & Medical Imaging GA MU417 UT WOS:A1994MU41700003 PM 8134539 ER PT J AU KOCHER, KM THOMAS, GW AF KOCHER, KM THOMAS, GW TI RETAINING ARMY NURSES - A LONGITUDINAL MODEL SO RESEARCH IN NURSING & HEALTH LA English DT Article ID EMPLOYEE TURNOVER AB A longitudinal sample of active duty Army nurses working in a broad range of nursing specialties and settings was analyzed for retention behavior. A turnover model of actual retention behavior, estimated using logistic regression, included external market, personal/demographic, and work-related variables as explanatory factors. Satisfaction with work and military life, satisfaction with location/assignment stability, race-ethnic group, and family status had significant effects on the retention of Army junior nurse-officers. (C) 1994 John Wiley & Sons, Inc. RP KOCHER, KM (reprint author), USN,POSTGRAD SCH,DEPT ADMINISTRAT SCI,MONTEREY,CA 93943, USA. NR 22 TC 8 Z9 8 U1 1 U2 1 PU JOHN WILEY & SONS INC PI NEW YORK PA 605 THIRD AVE, NEW YORK, NY 10158-0012 SN 0160-6891 J9 RES NURS HEALTH JI Res. Nurs. Health PD FEB PY 1994 VL 17 IS 1 BP 59 EP 65 DI 10.1002/nur.4770170109 PG 7 WC Nursing SC Nursing GA MR667 UT WOS:A1994MR66700008 PM 8134612 ER PT J AU AMUNDSON, DE DIAMANT, J AF AMUNDSON, DE DIAMANT, J TI SEVERE METABOLIC ALKALOSIS SO SOUTHERN MEDICAL JOURNAL LA English DT Note ID ACID-BASE DISTURBANCES; INTRAVENOUS-INFUSION; HYDROCHLORIC-ACID; SURGICAL PATIENTS; ALKALEMIA AB Our patient's acid-base disturbance may be among the highest recorded in nonfatal cases of metabolic alkalosis. This case also shows that life-threatening alkalemia can be safely and effectively treated by defining and removing the causes of alkalosis and applying aggressive supportive therapy with fluid repletion and potassium and electrolyte replacement. The need for potentially dangerous therapy such as exogenous acid administration, dialysis, or forced mechanical depression of respiration should not routinely be used on the basis of blood pH alone, and it should never replace thoughtful, organized supportive care. C1 USN HOSP, DEPT CRIT CARE, SAN DIEGO, CA USA. SCRIPPS CLIN & RES FDN, LA JOLLA, CA USA. RP AMUNDSON, DE (reprint author), USN HOSP, DEPT CLIN INVEST, SAN DIEGO, CA 92134 USA. NR 15 TC 1 Z9 1 U1 0 U2 2 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 FEB PY 1994 VL 87 IS 2 BP 275 EP 277 DI 10.1097/00007611-199402000-00028 PG 3 WC Medicine, General & Internal SC General & Internal Medicine GA MZ120 UT WOS:A1994MZ12000028 PM 8115901 ER PT J AU KOSTOFF, RN AF KOSTOFF, RN TI QUANTITATIVE QUALITATIVE FEDERAL RESEARCH IMPACT EVALUATION PRACTICES SO TECHNOLOGICAL FORECASTING AND SOCIAL CHANGE LA English DT Article AB This paper describes the quantitative and qualitative practice of federal research impact evaluation. Evaluation of research impact is described for three cases: Research selection, where the work has not yet been performed; research review, where work and results are ongoing; and ex-post research assessment, where research has been completed and results can be tracked. Qualitative methods (such as peer review) and quantitative methods (such as cost-benefit analysis and bibliometrics) are described. Although peer review in its broadest sense is the most widely used method in research selection, review, and ex-post assessment, it has its deficiencies, and there is no single method that provides a complete impact evaluation. RP OFF NAVAL RES, ARLINGTON, VA 22217 USA. NR 55 TC 10 Z9 10 U1 0 U2 4 PU ELSEVIER SCIENCE INC PI NEW YORK PA 360 PARK AVE SOUTH, NEW YORK, NY 10010-1710 USA SN 0040-1625 EI 1873-5509 J9 TECHNOL FORECAST SOC JI Technol. Forecast. Soc. Chang. PD FEB PY 1994 VL 45 IS 2 BP 189 EP 205 DI 10.1016/0040-1625(94)90093-0 PG 17 WC Business; Planning & Development SC Business & Economics; Public Administration GA NN982 UT WOS:A1994NN98200006 ER PT J AU MEYER, JR REISINGER, AR HARRIS, KA YANKA, RW MOHNKERN, LM AF MEYER, JR REISINGER, AR HARRIS, KA YANKA, RW MOHNKERN, LM TI MONOLAYER THICKNESS FLUCTUATIONS IN INFRARED PHOTOLUMINESCENCE FOR [211]-ORIENTED HGTE-CDTE SUPERLATTICES SO APPLIED PHYSICS LETTERS LA English DT Article ID MOLECULAR-BEAM EPITAXY; QUANTUM-WELL STRUCTURES; INTERFACES; GROWTH AB We report the observation of multiple photoluminescence peaks due to monolayer thickness fluctuations in HgTe-CdTe superlattices. The spectra for seven different [211]-oriented superlattices with band gaps varying from 133 to 495 meV exhibit double peaks, and in nearly all cases the energy splitting corresponds to a difference of approximate to 1.5 ML in the quantum well thickness. C1 MARTIN MARIETTA ELECTR LAB,SYRACUSE,NY 13221. RP MEYER, JR (reprint author), USN,RES LAB,CODE 5613,WASHINGTON,DC 20375, USA. NR 15 TC 6 Z9 6 U1 1 U2 1 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0003-6951 J9 APPL PHYS LETT JI Appl. Phys. Lett. PD JAN 31 PY 1994 VL 64 IS 5 BP 545 EP 547 DI 10.1063/1.111098 PG 3 WC Physics, Applied SC Physics GA MU633 UT WOS:A1994MU63300005 ER PT J AU GUHA, S HENDERSHOT, G PEEBLES, D STEINER, P KOZLOWSKI, F LANG, W AF GUHA, S HENDERSHOT, G PEEBLES, D STEINER, P KOZLOWSKI, F LANG, W TI PHOTOLUMINESCENCE AND RAMAN STUDIES OF POROUS SILICON IN POLYMETHYL METHACRYLATE SO APPLIED PHYSICS LETTERS LA English DT Article ID LIGHT-EMISSION; SI AB We report the observation of strong luminescence from porous Si grains containing Si nanocrystallites embedded in polymethyl methacrylate disks. In concentrated samples, forward and backscattered photoluminescence spectra were just as strong as in porous Si on Si wafers. This new result indicates that porous Si grains could be embedded in nonconducting polymers and would retain all its inherent characteristics as in porous Si layers on Si wafers. C1 FRAUNHOFER INST SOLID STATE TECHNOL,W-8000 MUNICH,GERMANY. RP GUHA, S (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. RI Lang, Walter/G-3835-2011; OI Lang, Walter/0000-0002-9813-5231 NR 18 TC 20 Z9 20 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 JAN 31 PY 1994 VL 64 IS 5 BP 613 EP 615 DI 10.1063/1.111066 PG 3 WC Physics, Applied SC Physics GA MU633 UT WOS:A1994MU63300028 ER PT J AU BALIZER, E FEDDERLY, J HAUGHT, D DICKENS, B DEREGGI, AS AF BALIZER, E FEDDERLY, J HAUGHT, D DICKENS, B DEREGGI, AS TI FTIR AND X-RAY STUDY OF POLYMORPHS OF NYLON-11 AND RELATION TO FERROELECTRICITY SO JOURNAL OF POLYMER SCIENCE PART B-POLYMER PHYSICS LA English DT Article DE NYLON-11; DEUTERATION; FERMI RESONANCES; POLYMORPHS; CRYSTAL TRANSITIONS AB Nylon-11 polymorphs have been studied by x-ray diffraction and by infrared spectroscopy. A gamma or gamma-like phase of Nylon-11 was produced by treating the metastable delta' phase with gaseous HCl or DCl and then exposing the resulting complex (amidonium salt) to 100% RH H2O or D2O vapor. An oriented form of the gamma or gamma-like phase results from treatment of the oriented delta' phase, but stretching of the unoriented gamma or gamma-like phase, obtained by treatment of the unoriented delta' phase, induces a transformation to the ct phase stable at room temperature. The use of DCl and D2O produced highly deuterated samples with Fermi resonances indicating the relative strengths of the hydrogen bonds are weakest in the a phase, intermediate in the delta' phase and strongest in the gamma or gamma-like phase. (C) 1994 John Wiley and Sons, Inc. C1 NIST,DIV POLYMERS,GAITHERSBURG,MD 20899. RP BALIZER, E (reprint author), NSWC,POLYMER PHYS GRP,SILVER SPRING,MD 20903, USA. NR 12 TC 23 Z9 24 U1 2 U2 7 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 JAN 30 PY 1994 VL 32 IS 2 BP 365 EP 369 DI 10.1002/polb.1994.090320219 PG 5 WC Polymer Science SC Polymer Science GA MN970 UT WOS:A1994MN97000019 ER PT J AU DECOSTA, BR GEORGE, C LI, GY HE, XS AF DECOSTA, BR GEORGE, C LI, GY HE, XS TI HIGH-YIELD TRIFLUOROACETIC ACID-MEDIATED INTERMOLECULAR CONDENSATION OF 1-[2-BENZO[B]THIENYL]CYCLOALKANOLS SO JOURNAL OF ORGANIC CHEMISTRY LA English DT Note ID DOPAMINE C1 NIDDKD,ANALYT CHEM LAB,BETHESDA,MD 20892. USN,RES LAB,STRUCT MATTER LAB,WASHINGTON,DC 20375. RP DECOSTA, BR (reprint author), NIDDKD,MED CHEM LAB,9000 ROCKVILLE PIKE,BETHESDA,MD 20892, USA. NR 9 TC 3 Z9 3 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0022-3263 J9 J ORG CHEM JI J. Org. Chem. PD JAN 28 PY 1994 VL 59 IS 2 BP 482 EP 485 DI 10.1021/jo00081a033 PG 4 WC Chemistry, Organic SC Chemistry GA MV010 UT WOS:A1994MV01000033 ER PT J AU LOMIZE, AL FLIPPENANDERSON, JL GEORGE, C MOSBERG, HI AF LOMIZE, AL FLIPPENANDERSON, JL GEORGE, C MOSBERG, HI TI CONFORMATIONAL-ANALYSIS OF THE DELTA-RECEPTOR-SELECTIVE, CYCLIC OPIOID PEPTIDE, TYR-CYCLO[D-CYS-PHE-D-PEN]OH (JOM-13) - COMPARISON OF X-RAY CRYSTALLOGRAPHIC STRUCTURES, MOLECULAR MECHANICS SIMULATIONS, AND H-1-NMR DATA SO JOURNAL OF THE AMERICAN CHEMICAL SOCIETY LA English DT Article ID HYDROGEN-BOND INTERACTIONS; OCCURRING AMINO-ACIDS; NONBONDED INTERACTIONS; ENERGY MINIMIZATION; ENKEPHALIN; ENKEPHALIN; ANALOGS; POLYPEPTIDES; PARAMETERS; DYNAMICS AB The conformational features of the delta-selective, cyclic opioid peptide Tyr-cyclo[D-Cys-Phe-D-Pen]OH (JOM-13) were investigated using a combination of experimental (X-ray crystallography, H-1 NMR spectroscopy) and theoretical (molecular mechanics computations) techniques. Energy calculations with the CHARMm force field show the existence of a single energetically preferred backbone conformation for the cyclic tripeptide portion of the molecule. Several distinct low-energy conformations were calculated, however, for the disulfide bridge linking the D-Cys and D-Pen residues, for the single Tyr residue outside the cycle, and for the Tyr and Phe side chains. The two calculated lowest-energy conformers of the D-Cys, D-Pen disulfide bridge (A and B) differ in values of D-Cys chi1 and chi3 (S-S) torsion angles (the -60-degrees,90-degrees and 180-degrees,-90-degrees combinations). This is consistent with the observation of two H-1 NMR signal sets in aqueous solution (in the ratio 68:32) with distinctly different vicinal coupling constants for protons H-C(alpha)C(beta)-H that correspond to a D-Cys chi1 angle of about -60-degrees for the first set and approximately 180-degrees or +60-degrees for the second. X-ray crystallographic analysis of crystals grown from aqueous solution also revealed two independent conformers which are in excellent agreement with the computational and NMR data for the rigid, cyclic part of the molecule including the disulfide bridge. However, H-1 NMR data and computational results indicate that the flexible elements of JOM-13 (the exocyclic Tyr residue and the Tyr and Phe side chains) have no fixed structure in water solution. In the crystalline environment they adopt conformations that are stabilized mainly by intermolecular interactions and which do not correspond exactly to any local energy minimum identified in the molecular mechanics calculations. C1 UNIV MICHIGAN,COLL PHARM,ANN ARBOR,MI 48109. USN,RES LAB,STRUCT MAT LAB,WASHINGTON,DC 20375. NR 31 TC 33 Z9 33 U1 0 U2 3 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 JAN 26 PY 1994 VL 116 IS 2 BP 429 EP 436 DI 10.1021/ja00081a001 PG 8 WC Chemistry, Multidisciplinary SC Chemistry GA MV283 UT WOS:A1994MV28300001 ER PT J AU JACKSON, EM WEAVER, BD SUMMERS, GP AF JACKSON, EM WEAVER, BD SUMMERS, GP TI EFFECT OF PROTON IRRADIATION ON THE CRITICAL-CURRENT AND RESISTANCE OF HIGH T-C GRAIN-BOUNDARY JOSEPHSON-JUNCTIONS SO APPLIED PHYSICS LETTERS LA English DT Article AB We have investigated the effects of defects on the critical current and resistance of high T-c grain boundary Josephson junctions using irradiation with 2-MeV protons. Radiation-induced defects cause the critical current (I-c) to decrease and the shunt resistance (R) to increase such that I(c)R alpha 1/R. The data are consistent with a tunneling barrier height increasing with fluence. C1 USN,RES LAB,WASHINGTON,DC 20375. UNIV MARYLAND,BALTIMORE,MD 21228. NR 10 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 JAN 24 PY 1994 VL 64 IS 4 BP 511 EP 513 DI 10.1063/1.111089 PG 3 WC Physics, Applied SC Physics GA MT009 UT WOS:A1994MT00900040 ER PT J AU WALLACE, MR MILLER, LK NGUYEN, MT SHIELDS, AR AF WALLACE, MR MILLER, LK NGUYEN, MT SHIELDS, AR TI OTOTOXICITY WITH AZITHROMYCIN SO LANCET LA English DT Letter C1 USN,MED CTR,DEPT PHARM,SAN DIEGO,CA 92134. USN,MED CTR,DEPT OTOLARYNGOL,SAN DIEGO,CA 92134. USN,MED CTR,DEPT CLIN INVEST,SAN DIEGO,CA 92134. RP WALLACE, MR (reprint author), USN,MED CTR,DEPT INTERNAL MED INFECT DIS,SAN DIEGO,CA 92134, USA. NR 3 TC 43 Z9 43 U1 1 U2 2 PU LANCET LTD PI LONDON PA 42 BEDFORD SQUARE, LONDON, ENGLAND WC1B 3SL SN 0140-6736 J9 LANCET JI Lancet PD JAN 22 PY 1994 VL 343 IS 8891 BP 241 EP 241 DI 10.1016/S0140-6736(94)91030-8 PG 1 WC Medicine, General & Internal SC General & Internal Medicine GA MT332 UT WOS:A1994MT33200054 PM 7904701 ER PT J AU ANDREWS, JM LIEBERMAN, SH AF ANDREWS, JM LIEBERMAN, SH TI NEURAL-NETWORK APPROACH TO QUALITATIVE IDENTIFICATION OF FUELS AND OILS FROM LASER-INDUCED FLUORESCENCE-SPECTRA SO ANALYTICA CHIMICA ACTA LA English DT Article DE FLUOROMETRY; PRINCIPAL COMPONENT ANALYSIS; FUELS; NEURAL NETWORKS; OILS ID MULTIVARIATE CALIBRATION; RECOGNITION AB A series of software implemented, three-layer, backpropagation neural networks is trained to identify seven classes of petroleum hydrocarbon based fuels and oils from their fluorescence emission spectra. The classes include: 87 and 92 octane unleaded gasoline, diesel fuel No. 2, diesel fuel marine, JP5, and lube oils 2190 and 9250. The nitrogen laser induced fluorescence spectra of multiple samples of each class are collected through an optical fiber incorporated into a multichannel detection system. Thirty-six spectral examples of the seven fuel/oil classes are partitioned into seven separate paired combinations of training and test spectra. Each combination uses 29 spectra to independently train a network. The spectra from the remaining seven samples are used to test the trained network's ability to make generalized classifications. Networks trained with data sampled directly from the normalized fluorescence emission spectra accurately identify 96% of the test spectra. An additional series of networks is trained and tested using the same spectra but with principal component analysis (PCA) employed as a preprocessor. Networks trained using PCA processed spectral data achieve somewhat lower performance, successfully identifying only 90% of the test spectra. C1 USN COMMAND,CTR CONTROL OCEAN SURVEILLANCE,DIV RES DEV TEST & EVALUAT,SAN DIEGO,CA 92152. RP ANDREWS, JM (reprint author), COMP SCI CORP,4045 HANCOCK ST,SAN DIEGO,CA 92110, USA. NR 26 TC 27 Z9 27 U1 0 U2 2 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0003-2670 J9 ANAL CHIM ACTA JI Anal. Chim. Acta PD JAN 20 PY 1994 VL 285 IS 1-2 BP 237 EP 246 DI 10.1016/0003-2670(94)85026-7 PG 10 WC Chemistry, Analytical SC Chemistry GA MU847 UT WOS:A1994MU84700026 ER PT J AU KARPEN, JT DAHLBURG, RB DAVILA, JM AF KARPEN, JT DAHLBURG, RB DAVILA, JM TI THE EFFECTS OF KELVIN-HELMHOLTZ INSTABILITY ON RESONANCE-ABSORPTION LAYERS IN CORONAL LOOPS SO ASTROPHYSICAL JOURNAL LA English DT Article DE INSTABILITIES; MHD; SUN, CORONA ID SOLAR CORONA; ALFVEN WAVES; NUMERICAL-SIMULATION; CURRENT SHEETS; SURFACE-WAVES; TURBULENCE; PLASMAS AB One of the long-standing uncertainties in the wave-resonance theory of coronal heating is the stability of the resonance layer. The wave motions in the resonance layer produce highly localized shear flows which vary sinusoidally in time with the resonance period. This configuration is potentially susceptible to the Kelvin-Helmholtz instability (KHI), which can enhance small-scale structure and turbulent broadening of shear layers on relatively rapid ideal timescales. We have investigated numerically the response of a characteristic velocity profile, derived from resonance absorption models, to finite fluid perturbations comparable to photospheric fluctuations. We find that the KHI primarily should affect long (greater than or similar to 6 x 10(4) km) loops where higher velocity flows (M greater than or similar to 0.2) exist in resonance layers of order 100 km wide. There, the Kelvin-Helmholtz growth time is comparable to or less than the resonance quarter-period, and the potentially stabilizing magnetic effects are not felt until the instability is well past the linear growth stage. Not only is the resonance layer broadened by the KHI, but also the convective energy transport out of the resonance layer is increased, thus adding to the efficiency of the wave-resonance heating process. In shorter loops, e.g., those in bright points and compact flares, the stabilization due to the magnetic field and the high resonance frequency inhibit the growth of the Kelvin-Helmholtz instability beyond a minimal level. C1 USN,RES LAB,COMPUTAT PHYS & FLUID DYNAM LAB,WASHINGTON,DC 20375. NASA,GODDARD SPACE FLIGHT CTR,GREENBELT,MD 20771. RP KARPEN, JT (reprint author), USN,RES LAB,EO HULBURT CTR SPACE RES,CODE 7675K,WASHINGTON,DC 20375, USA. RI Karpen, Judith/E-1484-2012 NR 35 TC 21 Z9 21 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 JAN 20 PY 1994 VL 421 IS 1 BP 372 EP 380 DI 10.1086/173655 PN 1 PG 9 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA MU449 UT WOS:A1994MU44900037 ER PT J AU BENTLEY, RD DOSCHEK, GA SIMNETT, GM RILEE, ML MARISKA, JT CULHANE, JL KOSUGI, T WATANABE, T AF BENTLEY, RD DOSCHEK, GA SIMNETT, GM RILEE, ML MARISKA, JT CULHANE, JL KOSUGI, T WATANABE, T TI THE CORRELATION OF SOLAR-FLARE HARD X-RAY-BURSTS WITH DOPPLER BLUESHIFTED SOFT-X-RAY FLARE EMISSION SO ASTROPHYSICAL JOURNAL LA English DT Article DE SUN, ACTIVITY; SUN, FLARES; SUN, X-RAYS, GAMMA RAYS AB We have investigated the temporal correlation between hard X-ray bursts and the intensity of Doppler blueshifted soft X-ray spectral line emission. We find a strong correlation for many events that have intense blueshifted spectral signatures and some correlation in events with modest blueshifts. The onset of hard X-rays frequently coincides to within a few seconds with the onset of blueshifted emission. The peak intensity of blueshifted emission is frequently close in time to the peak of the hard X-ray emission. Decay rates of the blueshifted and hard X-ray emission are similar, with the decay of the blueshifted emission tending to lag behind the hard X-ray emission in some cases. There are, however, exceptions to these conclusions, and, therefore, the results should not be generalized to all flares. Most of the data for this work were obtained from instruments flown on the Japanese Yohkoh solar spacecraft. C1 USN, RES LAB, EO HULBURT CTR SPACE RES, WASHINGTON, DC 20375 USA. UNIV BIRMINGHAM, SCH PHYS SPACE RES, BIRMINGHAM B15 2TT, ENGLAND. CORNELL UNIV, PLASMA STUDIES LAB, ITHACA, NY 14853 USA. NATL ASTRON OBSERV, MITAKA, TOKYO 181, JAPAN. RP BENTLEY, RD (reprint author), UCL, MULLARD SPACE SCI LAB, HOLMBURY RH5 6NT, ENGLAND. NR 11 TC 40 Z9 40 U1 0 U2 0 PU IOP PUBLISHING LTD PI BRISTOL PA TEMPLE CIRCUS, TEMPLE WAY, BRISTOL BS1 6BE, ENGLAND SN 0004-637X J9 ASTROPHYS J JI Astrophys. J. PD JAN 20 PY 1994 VL 421 IS 1 BP L55 EP L58 DI 10.1086/187186 PN 2 PG 4 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA MU450 UT WOS:A1994MU45000015 ER PT J AU DENNIS, ML DIXON, JW AGGARWAL, I AF DENNIS, ML DIXON, JW AGGARWAL, I TI HIGH-POWER UP-CONVERSION LASING AT 810NM, IN TM-ZBLAN FIBER SO ELECTRONICS LETTERS LA English DT Article DE FIBER LASERS; OPTICAL PUMPING; UP-CONVERSION ID FIBER LASER; BLUE-LIGHT; GENERATION AB The Letter reports upconversion lasing at 810nm in thulium doped fluorozirconate fibre pumped by an Nd:YAG laser at 1064nm, with an output power greater than 1.2W and slope efficiency of 37%. Tunability over the range 803-816nm is demonstrated. This is the highest power and most efficient upconversion laser reported to date in any gain medium. RP DENNIS, ML (reprint author), USN,RES LAB,CODE 5670,WASHINGTON,DC 20375, USA. NR 9 TC 21 Z9 23 U1 1 U2 2 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 JAN 20 PY 1994 VL 30 IS 2 BP 136 EP 137 DI 10.1049/el:19940077 PG 2 WC Engineering, Electrical & Electronic SC Engineering GA MW040 UT WOS:A1994MW04000028 ER PT J AU ELSTON, R THOMPSON, KL HILL, GJ AF ELSTON, R THOMPSON, KL HILL, GJ TI DETECTION OF STRONG IRON EMISSION FROM QUASARS AT REDSHIFT-Z-GREATER-THAN-3 SO NATURE LA English DT Article ID FE-II EMISSION; ACTIVE GALACTIC NUCLEI; X-RAY PROPERTIES; SEYFERT-1 GALAXIES; IRAS QUASAR; QSOS; REDSHIFT; SPECTRA; SPECTROPHOTOMETRY; SUPERNOVAE AB QUASARs are distant, luminous objects generally thought to be powered by the accretion of gas onto a supermassive black hole , their spectra are characterized by broad emission lines originating from a dense region close to the central energy source1. The best-studied spectral region in low-redshift quasars is near the Hbeta line at 4,861 angstrom (in the quasar rest frame) where there are also lines arising from singly ionized iron and doubly ionized oxygen. New technology has enabled us to detect strong iron emission in the spectra of the high-redshift (z > 3) quasars Q0014 + 813 and Q0663 + 680, in which these lines are redshifted to the near-infrared. The strength of this emission suggests an iron abundance (relative to hydrogen) higher than in the solar neighbourhood. This high iron abundance supports the view that quasars are located in the centres of massive galaxies. If type la supernovae are responsible for the iron enrichment2, significant star formation must have taken place in the host galaxies at least one billion years earlier, providing a constraint on the age of the Universe at that redshift. C1 USN,RES LAB,WASHINGTON,DC 20375. UNIV TEXAS,MCDONALD OBSERV,AUSTIN,TX 78712. RP ELSTON, R (reprint author), CERRO TOLOLO INTERAMER OBSERV,CASILLA 603,LA SERENA,CHILE. NR 33 TC 41 Z9 41 U1 0 U2 0 PU MACMILLAN MAGAZINES LTD PI LONDON PA PORTERS SOUTH, 4 CRINAN ST, LONDON, ENGLAND N1 9XW SN 0028-0836 J9 NATURE JI Nature PD JAN 20 PY 1994 VL 367 IS 6460 BP 250 EP 251 DI 10.1038/367250a0 PG 2 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA MR494 UT WOS:A1994MR49400047 ER PT J AU PURDY, AP AF PURDY, AP TI INDIUM(III) AMIDES AND NITRIDES SO INORGANIC CHEMISTRY LA English DT Article ID CRYSTAL-STRUCTURES AB Indium amide (In(NH2)s) was synthesized from a reaction between InI3 and 3 equiv of KNH2 in anhydrous liquid ammonia at 25 degrees C. The white solid is nearly insoluble in ammonia but dissolves in NH3 solutions of KNH2 to form potassium indium amides, KxIn(NH2)(3+x). Sodium indium amides can be obtained similarly. A reaction between InI3, 3 equiv of LiI, and 6 equiv of KNH2 affords Li3In(NH2)(6), which is insoluble in ammonia. Indium nitride is obtained from the thermolysis of In(NH2)(3), NaxIn(NH2)(3+x), and KxIn(NH2)(3+x). Reduction to indium metal also occurs during thermal decomposition of some of the potassium indium amides. Thermolysis of Li3In(NH2)(6) affords the new ternary nitride Li3InN2, an orange, water-sensitive electrical insulator, whose powder pattern was indexed to a cubic primitive cell of a = 10.136(8) Angstrom. Direct reaction between Li3N and InN produces InLi in addition to Li3InN2, and thus is not a viable synthesis route to this new nitride. RP PURDY, AP (reprint author), USN, RES LAB, DIV CHEM, CODE 6120, WASHINGTON, DC 20375 USA. NR 37 TC 27 Z9 27 U1 0 U2 8 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0020-1669 J9 INORG CHEM JI Inorg. Chem. PD JAN 19 PY 1994 VL 33 IS 2 BP 282 EP 286 DI 10.1021/ic00080a016 PG 5 WC Chemistry, Inorganic & Nuclear SC Chemistry GA MT108 UT WOS:A1994MT10800016 ER PT J AU DMITRIEV, VA IRVINE, K SPENCER, M KELNER, G AF DMITRIEV, VA IRVINE, K SPENCER, M KELNER, G TI LOW-RESISTIVITY (SIMILAR-TO-10(-5)OMEGA-CM2) OHMIC CONTACTS TO 6H SILICON-CARBIDE FABRICATED USING CUBIC SILICON-CARBIDE CONTACT LAYER SO APPLIED PHYSICS LETTERS LA English DT Article ID GROWTH AB Silicon carbide is a wide band-gap semiconductor material which exists in more than 170 polytypes. In this work, heteropolytype epitaxy was used to decrease the specific contact resistance of ohmic contacts to the 6H-SiC polytype (band gap E(g) approximately 3.0 eV). High quality ohmic contacts were produced by metallizing and annealing a thin cap layer of 3C-SiC (E(g) approximately 2.3 eV) grown by chemical vapor deposition on either n- or p-type 6H-SiC. The measured specific contact resistance (r(c)) of the ohmic contacts to n-type 6H-SiC was found to be less than 1.7 x 10(-5) and 2 x 10(-5) OMEGA cm2 for contacts to p-type 6H-SiC. C1 HOWARD UNIV, MAT SCI RES CTR EXCELLENCE, WASHINGTON, DC 20059 USA. USN, RES LAB, WASHINGTON, DC 20375 USA. NR 17 TC 29 Z9 29 U1 3 U2 10 PU AMER INST PHYSICS PI MELVILLE PA 1305 WALT WHITMAN RD, STE 300, MELVILLE, NY 11747-4501 USA SN 0003-6951 EI 1077-3118 J9 APPL PHYS LETT JI Appl. Phys. Lett. PD JAN 17 PY 1994 VL 64 IS 3 BP 318 EP 320 DI 10.1063/1.111193 PG 3 WC Physics, Applied SC Physics GA MR536 UT WOS:A1994MR53600020 ER PT J AU MARRIAN, CRK PERKINS, FK BRANDOW, SL KOLOSKI, TS DOBISZ, EA CALVERT, JM AF MARRIAN, CRK PERKINS, FK BRANDOW, SL KOLOSKI, TS DOBISZ, EA CALVERT, JM TI LOW-VOLTAGE ELECTRON-BEAM LITHOGRAPHY IN SELF-ASSEMBLED ULTRATHIN FILMS WITH THE SCANNING TUNNELING MICROSCOPE SO APPLIED PHYSICS LETTERS LA English DT Article AB With a scanning tunneling microscope (STM) operating in vacuum, we have studied the lithographic patterning of self-assembling organosilane monolayer resist films. Where the organic group is benzyl chloride, the resist layer can be patterned with electrons down to 4 eV in energy. The patterned films have been used as templates for the electroless plating of thin Ni films. Linewidths down to approximately 20 nm have been observed in scanning electron micrographs of the plated films. Still smaller features are observed in STM images of the exposed organosilane films. RP MARRIAN, CRK (reprint author), USN,RES LAB,DIV ELECTR SCI,CODE 6864,WASHINGTON,DC 20375, USA. NR 14 TC 125 Z9 126 U1 1 U2 17 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 JAN 17 PY 1994 VL 64 IS 3 BP 390 EP 392 DI 10.1063/1.111157 PG 3 WC Physics, Applied SC Physics GA MR536 UT WOS:A1994MR53600044 ER PT J AU COLMENERO, J ALEGRIA, A SANTANGELO, PG NGAI, KL ROLAND, CM AF COLMENERO, J ALEGRIA, A SANTANGELO, PG NGAI, KL ROLAND, CM TI DETAILED CORRESPONDENCES BETWEEN DIELECTRIC AND MECHANICAL RELAXATIONS IN POLY(VINYLETHYLENE) SO MACROMOLECULES LA English DT Article ID DYNAMIC LIGHT-SCATTERING; GLASS-TRANSITION TEMPERATURE; VISCOELASTIC RELAXATION; POLY(PROPYLENE GLYCOL); MOLECULAR-DYNAMICS; POLYVINYL ACETATE); PHOTON-CORRELATION; SPECTROSCOPY; MOTION; TG AB Dielectric and dynamic mechanical measurements were carried out on poly(vinylethylene) in the vicinity of its glass transition temperature. By using four different spectrometers, data were obtained over a broad range of frequencies and temperatures. The shape of the segmental relaxation function, though weakly temperature dependent, was the same for the two experimental probes when compared at the same temperature. Similarly, the shift factors, describing the temperature dependence of the segmental relaxation time, were equivalent as measured dielectrically or mechanically. Such equivalence is consistent with a correlation between time and temperature dependencies of the segmental relaxation; moreover, it demonstrates that the correlation is maintained even when different dynamical variables (e.g., dipole moment versus modulus) are used to probe the local segmental motion. In contrast to the shape of the relaxation function and the time-temperature shift factors, the correlation times measured by the two spectroscopies bear no relationship to one another. C1 USN, RES LAB, WASHINGTON, DC 20375 USA. UNIV BASQUE COUNTRY, DEPT PHYS MAT, SAN SEBASTIAN, SPAIN. RI Colmenero, Juan/G-8725-2015; ALEGRIA, ANGEL/H-1035-2015 OI Colmenero, Juan/0000-0002-2440-4953; ALEGRIA, ANGEL/0000-0001-6125-8214 NR 30 TC 52 Z9 52 U1 0 U2 4 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0024-9297 J9 MACROMOLECULES JI Macromolecules PD JAN 17 PY 1994 VL 27 IS 2 BP 407 EP 410 DI 10.1021/ma00080a013 PG 4 WC Polymer Science SC Polymer Science GA MT924 UT WOS:A1994MT92400013 ER PT J AU STARKWEATHER, HW AVAKIAN, P FONTANELLA, JJ WINTERSGILL, MC AF STARKWEATHER, HW AVAKIAN, P FONTANELLA, JJ WINTERSGILL, MC TI EFFECT OF HYDROFLUOROCARBONS ON THE LOW-TEMPERATURE DIELECTRIC-PROPERTIES OF POLY(TETRAFLUOROETHYLENE) SO MACROMOLECULES LA English DT Note ID NONCOOPERATIVE RELAXATIONS C1 DUPONT CO INC,CENT RES & DEV,EXPTL STN,WILMINGTON,DE 19880. USN ACAD,DEPT PHYS,ANNAPOLIS,MD 21402. NR 9 TC 2 Z9 2 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0024-9297 J9 MACROMOLECULES JI Macromolecules PD JAN 17 PY 1994 VL 27 IS 2 BP 610 EP 611 DI 10.1021/ma00080a042 PG 2 WC Polymer Science SC Polymer Science GA MT924 UT WOS:A1994MT92400042 ER PT J AU BUSSE, LE GOLDBERG, L SURETTE, MR MIZELL, G AF BUSSE, LE GOLDBERG, L SURETTE, MR MIZELL, G TI ABSORPTION LOSSES IN MGO-DOPED AND UNDOPED POTASSIUM NIOBATE SO JOURNAL OF APPLIED PHYSICS LA English DT Article ID 2ND-HARMONIC GENERATION; KNBO3 CRYSTALS; LASER; EMISSION AB Measurements of absorption losses in KNbO3 and MgO-doped KNbO3 were made in the blue and near-infrared wavelength regions using laser calorimetry. In the doped samples, the absorption loss for blue light was found to be 40% lower than that of the undoped samples. An enhancement in the infrared loss, caused by the presence of blue light, was observed in doped and undoped samples, but found to be much greater in the MgO-doped crystals. The blue-enhanced infrared absorption was characterized using two-wavelength laser calorimetry. Temporal variations in the second-harmonic power, caused by nonuniform heating of the active volume by the absorbed infrared and second-harmonic power, are described. C1 VIRGO OPT INC,PORT RICHEY,FL. RP BUSSE, LE (reprint author), USN,RES LAB,CODE 6570,WASHINGTON,DC 20375, USA. NR 19 TC 19 Z9 19 U1 0 U2 2 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0021-8979 J9 J APPL PHYS JI J. Appl. Phys. PD JAN 15 PY 1994 VL 75 IS 2 BP 1102 EP 1110 DI 10.1063/1.356493 PG 9 WC Physics, Applied SC Physics GA MT490 UT WOS:A1994MT49000056 ER PT J AU THOMPSON, CM TAYLOR, SG MCGEE, WW AF THOMPSON, CM TAYLOR, SG MCGEE, WW TI GEL-PERMEATION CHROMATOGRAPHIC ANALYSIS OF POLYURETHANE PREPOLYMER SYNTHESIS KINETICS .2. THE EFFECTS OF STOICHIOMETRY AND TYPE OF DIISOCYANATE SO JOURNAL OF POLYMER SCIENCE PART A-POLYMER CHEMISTRY LA English DT Article DE POLYURETHANE; CHROMATOGRAPHY; STOICHIOMETRY; GPC ID SIZE EXCLUSION CHROMATOGRAPHY AB The kinetics of formation of polyurethane prepolymers is studied by an analytical technique which involves reactive quenching of the isocyanate, separation of the oligomeric species by GPC, and measurement by UV absorbance of the quenched moieties. The precision of the kinetic parameters and the ratios of the oligomers are determined. The effect of changes in reactant stoichiometry on the ratio of oligomers is measured and compared to the value predicted by an equation from Flory. Toluene diisocyanate is shown to give fewer high oligomers than predicted, while methylene diphenylene diisocyanate gives nearly the predicted values. Tetramethylxylene diisocyanate gives more high oligomers than predicted, an unexpected but possibly important result. Catalyst is shown to increase the reaction rate of the last by more than 200 times. (C) 1994 John Wiley & Sons, Inc. C1 TEXAS RES INST INC,ORLANDO,FL 32806. RP THOMPSON, CM (reprint author), USN,RES LAB,UNDERWATER SOUND REF DETACHMENT,POB 568337,ORLANDO,FL 32856, USA. NR 11 TC 19 Z9 19 U1 1 U2 6 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 JAN 15 PY 1994 VL 32 IS 1 BP 113 EP 120 DI 10.1002/pola.1994.080320113 PG 8 WC Polymer Science SC Polymer Science GA MN434 UT WOS:A1994MN43400013 ER PT J AU ASKINS, CG PUTNAM, MA WILLIAMS, GM FRIEBELE, EJ AF ASKINS, CG PUTNAM, MA WILLIAMS, GM FRIEBELE, EJ TI STEPPED-WAVELENGTH OPTICAL-FIBER BRAGG GRATING ARRAYS FABRICATED IN-LINE ON A DRAW TOWER SO OPTICS LETTERS LA English DT Article AB More than 450 fiber Bragg gratings have been fabricated in line during the draw process in a period of 1 h with single pulses of a KrF excimer laser. Arrays of gratings have been written at different Bragg wavelengths by using an automated, computer-controlled interferometer. RP ASKINS, CG (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 6 TC 83 Z9 84 U1 0 U2 6 PU OPTICAL SOC AMER PI WASHINGTON PA 2010 MASSACHUSETTS AVE NW, WASHINGTON, DC 20036 SN 0146-9592 J9 OPT LETT JI Opt. Lett. PD JAN 15 PY 1994 VL 19 IS 2 BP 147 EP 149 DI 10.1364/OL.19.000147 PG 3 WC Optics SC Optics GA MR007 UT WOS:A1994MR00700025 PM 19829573 ER PT J AU SIGALAS, MM PAPACONSTANTOPOULOS, DA AF SIGALAS, MM PAPACONSTANTOPOULOS, DA TI TRANSFERABLE TOTAL-ENERGY PARAMETRIZATION FOR METALS - APPLICATIONS TO ELASTIC-CONSTANT DETERMINATION SO PHYSICAL REVIEW B LA English DT Article ID EMBEDDED-ATOM-METHOD; ALLOYS; MODEL AB In this work we present a method of fitting augmented-plane-wave energy bands and total-energy results for the fcc and bcc structures to a nonorthogonal tight-binding Hamiltonian from which the sum of the eigenvalues is derived, and to a simple pair potential that is designed to account for all the other terms of the total-energy expression. We have applied this method to calculate the elastic constants of the metals Rh, Pd, Ta, Ir, and Au, avoiding the expensive first-principles calculations of the distorted structures. We obtained very good agreement with both first-principles local-density-functional-theory calculations and experiment. C1 USN,RES LAB,COMPLEX SYST THEORY BRANCH,WASHINGTON,DC 20375. NR 21 TC 33 Z9 33 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 JAN 15 PY 1994 VL 49 IS 3 BP 1574 EP 1579 DI 10.1103/PhysRevB.49.1574 PG 6 WC Physics, Condensed Matter SC Physics GA MW694 UT WOS:A1994MW69400003 ER PT J AU SINGH, DJ AF SINGH, DJ TI ELECTRONIC-STRUCTURE OF NACUO2 SO PHYSICAL REVIEW B LA English DT Article ID TRANSITION-METAL COMPOUNDS; BRILLOUIN-ZONE; SPECIAL POINTS; BAND-GAPS; SUPERCONDUCTORS; DIVALENT; DENSITY; ENERGY; STATES AB The electronic structure of NaCuO2 has been calculated within the local-density approximation, using an extended general-potential linearized-augmented-plane-wave method. These calculations reveal that (i) NaCuO2 is a conventional insulator with a band gap arising from simple covalent effects and (ii) Cu is far from trivalent in this material. RP SINGH, DJ (reprint author), USN, RES LAB, COMPLEX SYST THEORY BRANCH, WASHINGTON, DC 20375 USA. RI Singh, David/I-2416-2012 NR 24 TC 7 Z9 7 U1 0 U2 6 PU AMER PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1098-0121 J9 PHYS REV B JI Phys. Rev. B PD JAN 15 PY 1994 VL 49 IS 3 BP 1580 EP 1585 DI 10.1103/PhysRevB.49.1580 PG 6 WC Physics, Condensed Matter SC Physics GA MW694 UT WOS:A1994MW69400004 ER PT J AU KIM, YD COOPER, SL KLEIN, MV JONKER, BT AF KIM, YD COOPER, SL KLEIN, MV JONKER, BT TI SPECTROSCOPIC ELLIPSOMETRY STUDY OF THE DILUTED MAGNETIC SEMICONDUCTOR SYSTEM ZN(MN,FE,CO)SE SO PHYSICAL REVIEW B LA English DT Review ID INTERBAND CRITICAL-POINTS; D EXCHANGE INTERACTION; TEMPERATURE-DEPENDENCE; DIELECTRIC FUNCTION; OPTICAL-PROPERTIES; ENERGY-GAP; SEMIMAGNETIC SEMICONDUCTORS; STRUCTURAL CHARACTERIZATION; EPITAXIAL-GROWTH; BAND ELECTRONS AB Single-crystal films of (001)Zn-1-x A(x) Se ( A = Mn, Fe, Co) (0 less than or equal to x < 0. 14) grown by molecular-beam epitaxy on (001)GaAs have been studied by spectroscopic ellipsometry in the 3.5-5.5 eV photon-energy range. Using fits of the E(1) and E(1) + Delta(1) peaks with a standard analytic expression, we find that the linewidths increase with x for all samples, the energies increase with x for Zn-1-x Fe-x Se and Zn-1-x Co-x Se, and the energies decrease with x for Zn-1-x Mn-x Se. A model describing the effects of the sp-d exchange interaction on the L point band-gap energy is developed and applied. We find that the strength of the energy correction due to this interaction, which is proportional to the product of the square of the exchange integrals and the magnetic susceptibility of the material, is largest in Mn-doped and smallest in Co-doped ZnSe. While the sp-d exchange interaction model is consistent with the composition dependence of the E(1) and E(1) + Delta(1) band-gap energies in Zn-1-x Mn-x Se, it does not describe the behavior observed in Zn-1-x Fe-x Se and Zn-1-x Co-x Se. We show that an sp-d hybridization model, which includes the location of the energy levels of the magnetic impurity d levels, can account for the composition dependence of E(1) and E(1) + Delta(1) band-gap energies of all three materials. C1 UNIV ILLINOIS,MAT RES LAB,URBANA,IL 61801. USN,RES LAB,WASHINGTON,DC 20375. RP KIM, YD (reprint author), UNIV ILLINOIS,DEPT PHYS,1110 W GREEN ST,URBANA,IL 61801, USA. NR 112 TC 102 Z9 108 U1 2 U2 12 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 JAN 15 PY 1994 VL 49 IS 3 BP 1732 EP 1742 DI 10.1103/PhysRevB.49.1732 PG 11 WC Physics, Condensed Matter SC Physics GA MW694 UT WOS:A1994MW69400024 ER PT J AU MEYER, JR HOFFMAN, CA BARTOLI, FJ RAMMOHAN, LR AF MEYER, JR HOFFMAN, CA BARTOLI, FJ RAMMOHAN, LR TI SEMIMETALLIC INAS/GA1-XINXSB SUPERLATTICES WITH HGTE/CDTE-LIKE BAND STRUCTURES SO PHYSICAL REVIEW B LA English DT Note ID HGTE-CDTE SUPERLATTICES; GASB SUPER-LATTICES; ELECTRONIC-STRUCTURE; OPTICAL-PROPERTIES; SEMICONDUCTOR; GAP; TRANSITION AB We demonstrate that, by enhancing the E(1)-H-1 wave-function overlap to maximize the interband interactions in semimetallic InAs/Ga1-xInxSb superlattices with thin Ga1-xInxSb layers, one can induce a band structure which is strikingly similar to that for semimetallic HgTe/CdTe superlattices. The indirect semimetallic alignment which results from a holelike dispersion of El and electronlike dispersion of H1 leads to the possibility of observing a wide range of phenomena such as mass broadening, double cyclotron resonance, a second semiconducting regime at large well thicknesses, and the magnetic generation of electron-hole plasmas above a critical field. Recent experimental data indicating the coexistence of multiple electron species in a semimetallic InAs/Ga1-xInxSb superlattice are readily interpreted in terms of the predicted arrangement of the bands. C1 WORCESTER POLYTECH INST,WORCESTER,MA 01609. RP MEYER, JR (reprint author), USN,RES LAB,CODE 5613,WASHINGTON,DC 20375, USA. RI Ram-Mohan, Ramdas/C-5167-2012 NR 21 TC 3 Z9 3 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD JAN 15 PY 1994 VL 49 IS 3 BP 2197 EP 2200 DI 10.1103/PhysRevB.49.2197 PG 4 WC Physics, Condensed Matter SC Physics GA MW694 UT WOS:A1994MW69400093 ER PT J AU PROKES, SM GLEMBOCKI, OJ AF PROKES, SM GLEMBOCKI, OJ TI ROLE OF INTERFACIAL OXIDE-RELATED DEFECTS IN THE RED-LIGHT EMISSION IN POROUS SILICON SO PHYSICAL REVIEW B LA English DT Note ID OPTICAL-PROPERTIES; PHOTOLUMINESCENCE; LUMINESCENCE; CENTERS; FIBERS; RAMAN; GLASS; BAND AB Intense laser irradiation has been used to anneal porous silicon. In situ Raman spectroscopy and photoluminescence (PL) spectroscopies have been used as probes of the silicon particle sizes and temperatures, and the resulting light emission of porous silicon. Once annealed, the PL of porous silicon while at 830 degrees C exhibited no PL energy shift from its 300-K position. Since the gap of silicon redshifts by 0.29 eV at 830 degrees C, this red PL cannot be the property of the Si particles. A model involving the presence of nonbridging oxygen hole centers has been suggested to account for this PL. RP PROKES, SM (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 26 TC 163 Z9 165 U1 1 U2 7 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD JAN 15 PY 1994 VL 49 IS 3 BP 2238 EP 2241 DI 10.1103/PhysRevB.49.2238 PG 4 WC Physics, Condensed Matter SC Physics GA MW694 UT WOS:A1994MW69400105 ER PT J AU AARONSON, HI REYNOLDS, WT AF AARONSON, HI REYNOLDS, WT TI DISCUSSION TO ATOM-PROBE FIELD-ION MICROSCOPY OF BAINITIC TRANSFORMATION IN 2.25CR-1MO WELD METAL SO SCRIPTA METALLURGICA ET MATERIALIA LA English DT Letter ID MO ALLOY; FERRITE C1 VIRGINIA POLYTECH INST & STATE UNIV,DEPT MAT SCI & ENGN,BLACKSBURG,VA 24061. USN,RES LAB,PHYS MET BRANCH,WASHINGTON,DC 20375. RP AARONSON, HI (reprint author), GEOCENTERS INC,FT WASHINGTON,MD 20744, USA. NR 23 TC 2 Z9 2 U1 0 U2 4 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0956-716X J9 SCRIPTA METALL MATER JI Scr. Metall. Materialia PD JAN 15 PY 1994 VL 30 IS 2 BP 265 EP 267 DI 10.1016/0956-716X(94)90051-5 PG 3 WC Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Materials Science; Metallurgy & Metallurgical Engineering GA MH465 UT WOS:A1994MH46500024 ER PT J AU MACKEY, DJ ZIRINO, A AF MACKEY, DJ ZIRINO, A TI COMMENTS ON TRACE-METAL SPECIATION IN SEAWATER OR DO ONIONS GROW IN THE SEA SO ANALYTICA CHIMICA ACTA LA English DT Article DE ATOMIC ABSORPTION SPECTROMETRY; COMPLEXATION IN NATURAL WATERS; ORGANIC COMPOUNDS; SEA WATER; TRACE METALS; WATERS ID COPPER ORGANIC-COMPLEXES; CATHODIC STRIPPING VOLTAMMETRY; PHASE LIQUID-CHROMATOGRAPHY; CUPRIC ION ACTIVITY; NATURAL-WATERS; NORTHEAST PACIFIC; ESTUARINE WATERS; DISSOLVED COPPER; AMBERLITE XAD-1; CHELATING RESIN AB Recent research has suggested that trace metals in seawater are almost completely complexed by organic compounds. The organic compounds seem to be very selective for a given metal, and form complexes having very high conditional stability constants (log K-cond=10-18). Measurements of the strong copper complexing capacity of seawater (using a technique based on competition with Chelex-100 resin), in the presence of weak ligands and reducing agents, are incompatible with this model. We propose that trace metals in seawater are mainly in the colloidal state with coordination bonds holding the colloid particles together. The speciation of trace metals in seawater is determined by kinetics and not by thermodynamics. C1 USN COMMAND,CTR CONTROL & OCEAN SURVEILLANCE,DIV RDT&E,SAN DIEGO,CA 95152. RP MACKEY, DJ (reprint author), CSIRO,DIV OCEANOG,BOX 1538,HOBART,TAS 7001,AUSTRALIA. NR 80 TC 60 Z9 63 U1 1 U2 14 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0003-2670 J9 ANAL CHIM ACTA JI Anal. Chim. Acta PD JAN 10 PY 1994 VL 284 IS 3 BP 635 EP 647 DI 10.1016/0003-2670(94)85068-2 PG 13 WC Chemistry, Analytical SC Chemistry GA MT904 UT WOS:A1994MT90400017 ER PT J AU WARDLAW, MJ VANDERLUGT, A AF WARDLAW, MJ VANDERLUGT, A TI DETECTION OF SHORT PULSES BY FRESNEL PREPROCESSING SO APPLIED OPTICS LA English DT Article AB Short pulses create unique Fresnel diffraction effects, as they propagate through an acousto-optic signal-processing system, that produce an interference pattern. By following the detection of the interferometric pattern with spectral analysis, we extract information about pulse width, pulse separation, and relative time of arrival. Laboratory models of the Fresnel-transform processing system and an optical spectrum analyzer were built and tested to verify the basic concepts. Pulses as short as the theoretical limit of 20 ns for this system and separated by as little as 60 ns or as much as 17 mus were detected and measured. Short pulses were also detected in the presence of cw signals by use of a frequency-variant matched-filtering operation. C1 N CAROLINA STATE UNIV, DEPT ELECT & COMP ENGN, RALEIGH, NC 27695 USA. RP WARDLAW, MJ (reprint author), USN, CTR SURFACE WARFARE, CODE F44, DAHLGREN, VA 22448 USA. NR 2 TC 0 Z9 0 U1 0 U2 0 PU OPTICAL SOC AMER PI WASHINGTON PA 2010 MASSACHUSETTS AVE NW, WASHINGTON, DC 20036 USA SN 0003-6935 J9 APPL OPTICS JI Appl. Optics PD JAN 10 PY 1994 VL 33 IS 2 BP 270 EP 279 PG 10 WC Optics SC Optics GA MX445 UT WOS:A1994MX44500016 PM 20862017 ER PT J AU GLESENER, JW AF GLESENER, JW TI HOLE CAPTURE IN BORON-DOPED DIAMOND SO APPLIED PHYSICS LETTERS LA English DT Article ID SEMICONDUCTING DIAMOND AB A carrier capture model based on the work of Lax [Phys. Rev. 119, 1502 (1960)] and Gibb et al. [Philos. Mag. 36, 1021 (1977)] is applied to diamond. This model accounts for the lower activation energy for boron in diamond measured using deep level transient spectroscopy (DLTS) techniques. The model assumes that when a carrier in the valence band is captured by an impurity, it occupies the highest energy acceptor excited state and then is quickly funneled to the lowest excited acceptor level. At the lowest energy excited acceptor level the trapped hole either thermalizes back to the valence band or reaches the ground state of the impurity via a ''slow'' multiphonon decay. Using this kinetic picture, previously reported DLTS results are shown to be consistent with the energy parameters for the boron acceptor level. These results will be of interest to researchers simulating the device properties of diamond and are an indication of the influence of the acceptor spectrum on the electrical properties of boron-doped diamond. RP GLESENER, JW (reprint author), USN,RES LAB,DIV OPT SCI,WASHINGTON,DC 20375, USA. NR 16 TC 18 Z9 18 U1 4 U2 5 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0003-6951 J9 APPL PHYS LETT JI Appl. Phys. Lett. PD JAN 10 PY 1994 VL 64 IS 2 BP 217 EP 219 DI 10.1063/1.111509 PG 3 WC Physics, Applied SC Physics GA MQ502 UT WOS:A1994MQ50200030 ER EF