FN Thomson Reuters Web of Science™ VR 1.0 PT J AU PURDY, AP BERRY, AD AF PURDY, AP BERRY, AD TI SYNTHESIS, CHARACTERIZATION, AND CVD EXPERIMENTS OF FLUORINATED METAL ALKOXIDES SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 SACHS FREEMAN ASSOCIATES INC,LANDOVER,MD 20785. USN,RES LAB,WASHINGTON,DC 20375. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD APR 5 PY 1992 VL 203 BP 46 EP FLUO PN 1 PG 0 WC Chemistry, Multidisciplinary SC Chemistry GA HK161 UT WOS:A1992HK16102304 ER PT J AU STEMPLE, JZ ROLISON, DR CURRAN, DJ AF STEMPLE, JZ ROLISON, DR CURRAN, DJ TI ELECTROCHEMICAL REACTIONS IN DISPERSIONS OF ZEOLITES SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 USN,RES LAB,SURFACE CHEM BRANCH,WASHINGTON,DC 20375. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD APR 5 PY 1992 VL 203 BP 47 EP COLL PN 1 PG 0 WC Chemistry, Multidisciplinary SC Chemistry GA HK161 UT WOS:A1992HK16101562 ER PT J AU MORRIS, RE SCHREIFELS, J AF MORRIS, RE SCHREIFELS, J TI ADSORPTION OF METAL DEACTIVATOR ADDITIVE ONTO METAL-SURFACES SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 USN,RES LAB,TECHNOL CTR SAFETY & SURVIVABIL,FUELS SECT,WASHINGTON,DC 20375. GEORGE MASON UNIV,DEPT CHEM,FAIRFAX,VA 22030. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD APR 5 PY 1992 VL 203 BP 48 EP PETR PN 2 PG 0 WC Chemistry, Multidisciplinary SC Chemistry GA HK162 UT WOS:A1992HK16201994 ER PT J AU CALVERT, JM CRESSICK, WJ DULCEY, CS KOLOSKI, TS GEORGER, JH CALABRESE, GS AF CALVERT, JM CRESSICK, WJ DULCEY, CS KOLOSKI, TS GEORGER, JH CALABRESE, GS TI ELECTROLESS METALLIZATION OF LIGAND-MODIFIED SURFACES FOR MICROLITHOGRAPHIC APPLICATIONS SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 USN,RES LAB,WASHINGTON,DC 20375. GEOCENTERS INC,FT WASHINGTON,MD 20744. SHIPLEY CO INC,MARLBOROUGH,MA 01752. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD APR 5 PY 1992 VL 203 BP 51 EP PMSE PN 3 PG 0 WC Chemistry, Multidisciplinary SC Chemistry GA HK163 UT WOS:A1992HK16300673 ER PT J AU ROBERTSON, DH WHITE, CT BRENNER, DW ELERT, ML AF ROBERTSON, DH WHITE, CT BRENNER, DW ELERT, ML TI MOLECULAR-DYNAMICS SIMULATIONS OF CHEMICALLY SUSTAINED SHOCK-WAVES SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 USN,RES LAB,THEORET CHEM SECT,WASHINGTON,DC 20375. USN ACAD,DEPT CHEM,ANNAPOLIS,MD 21402. RI Brenner, Donald/D-1741-2009 NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD APR 5 PY 1992 VL 203 BP 61 EP PHYS PN 2 PG 0 WC Chemistry, Multidisciplinary SC Chemistry GA HK162 UT WOS:A1992HK16202157 ER PT J AU SAMUELS, MQ COUGHLIN, CS AF SAMUELS, MQ COUGHLIN, CS TI ABSOLUTE MOLECULAR-WEIGHT DISTRIBUTION OF SOME POLYURETHANE ELASTOMERS VIA SEC-MULTI ANGLE LASER-LIGHT SCATTERING SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 USN,RES LAB,UNDERWATER SOUND REFERENCE DETACHMENT,ORLANDO,FL 32856. NR 0 TC 0 Z9 0 U1 0 U2 1 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD APR 5 PY 1992 VL 203 BP 83 EP POLY PN 3 PG 0 WC Chemistry, Multidisciplinary SC Chemistry GA HK163 UT WOS:A1992HK16300083 ER PT J AU COUGHLIN, CS SAMUELS, MQ AF COUGHLIN, CS SAMUELS, MQ TI CURE KINETICS OF SOME META-TETRAMETHYL XYLENE DIISOCYANATE BASED POLYURETHANE ELASTOMERS VIA FTIR SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 USN,RES LAB,UNDERWATER SOUND REFERENCE DETACHEMENT,ORLANDO,FL 32856. NR 0 TC 0 Z9 0 U1 0 U2 1 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD APR 5 PY 1992 VL 203 BP 84 EP POLY PN 3 PG 0 WC Chemistry, Multidisciplinary SC Chemistry GA HK163 UT WOS:A1992HK16300084 ER PT J AU ADAMS, J THIBODEAUX, A NACIRI, J SHASHIDHAR, R DURAN, RS AF ADAMS, J THIBODEAUX, A NACIRI, J SHASHIDHAR, R DURAN, RS TI FERROELECTRIC LIQUID-CRYSTALLINE MONOLAYERS AT THE AIR-WATER-INTERFACE - COMPARISON BETWEEN DIFFERENT CHEMICAL CONSTITUTIONS SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 UNIV FLORIDA,DEPT CHEM,CTR MACROMOLEC SCI & ENGN,GAINESVILLE,FL 32611. USN,RES LAB,CTR BIOMOLEC SCI & ENGN,WASHINGTON,DC 20375. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD APR 5 PY 1992 VL 203 BP 96 EP POLY PN 3 PG 0 WC Chemistry, Multidisciplinary SC Chemistry GA HK163 UT WOS:A1992HK16300096 ER PT J AU DOMINGUEZ, C RICE, KC DECOSTA, BR GEORGE, C AKUNNE, HC ROTHMAN, RB AF DOMINGUEZ, C RICE, KC DECOSTA, BR GEORGE, C AKUNNE, HC ROTHMAN, RB TI SYNTHESIS OF ISOTHIOCYANATE SUBSTITUTED N-[1-(2-BENZO[B]THIENYL]PIPERIDINES AS POTENTIAL AFFINITY LIGANDS FOR FURTHER CHARACTERIZATION OF THE COCAINE RECEPTOR SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 NIDDKD,MED CHEM LAB,BETHESDA,MD 20892. USN,RES LAB,WASHINGTON,DC 20375. NIDA,ADDICT RES CTR,CLIN PHARMACOL LAB,BALTIMORE,MD 21224. NR 0 TC 0 Z9 0 U1 0 U2 1 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD APR 5 PY 1992 VL 203 BP 97 EP MEDI PN 2 PG 0 WC Chemistry, Multidisciplinary SC Chemistry GA HK162 UT WOS:A1992HK16200298 ER PT J AU OGRADY, WE RUSSELL, AE LIN, AS AF OGRADY, WE RUSSELL, AE LIN, AS TI INSITU FAR-INFRARED STUDIES OF THE STRUCTURE OF INTERFACIAL WATER AT AG(111) AND AU(111) ELECTRODES SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 USN,RES LAB,SURFACE CHEM BRANCH,WASHINGTON,DC 20375. RI Russell, Andrea/B-8114-2009 NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD APR 5 PY 1992 VL 203 BP 104 EP COLL PN 1 PG 0 WC Chemistry, Multidisciplinary SC Chemistry GA HK161 UT WOS:A1992HK16101619 ER PT J AU HU, HSW GRIFFITH, JR AF HU, HSW GRIFFITH, JR TI PROCESSABLE HEAVILY FLUORINATED ACRYLIC RESINS WITH LOW DIELECTRIC-CONSTANTS SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 GEOCENTERS INC,FT WASHINGTON,MD 20744. USN,RES LAB,WASHINGTON,DC 20375. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD APR 5 PY 1992 VL 203 BP 130 EP PMSE PN 3 PG 0 WC Chemistry, Multidisciplinary SC Chemistry GA HK163 UT WOS:A1992HK16300752 ER PT J AU MOHS, JC HECKENDORN, DK AF MOHS, JC HECKENDORN, DK TI APPLICATIONS OF MOLECULAR MODELING TO TRANSITION-STATE ENERGIES AND CONFORMATIONS SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 USN ACAD,DEPT CHEM,ANNAPOLIS,MD 21402. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD APR 5 PY 1992 VL 203 BP 131 EP CHED PN 1 PG 0 WC Chemistry, Multidisciplinary SC Chemistry GA HK161 UT WOS:A1992HK16101134 ER PT J AU RIVET, DJ LAVELL, WT AF RIVET, DJ LAVELL, WT TI SYNTHESIS OF AN AMPHIPHILIC AZO DYE FOR 2ND HARMONIC-GENERATION SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 USN ACAD,ANNAPOLIS,MD 21402. AT&T BELL LABS,MURRAY HILL,NJ 07974. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD APR 5 PY 1992 VL 203 BP 132 EP CHED PN 1 PG 0 WC Chemistry, Multidisciplinary SC Chemistry GA HK161 UT WOS:A1992HK16101135 ER PT J AU STURDEVANT, N FITZGERALD, J AF STURDEVANT, N FITZGERALD, J TI TETRAAZAPORPHYRINS - THEORY AND EXPERIMENTAL-EVIDENCE INDICATE DIFFERENT ELECTRONIC CONFIGURATIONS THAN RELATED PORPHYRINS SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 USN ACAD,DEPT CHEM,ANNAPOLIS,MD 21402. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD APR 5 PY 1992 VL 203 BP 133 EP CHED PN 1 PG 0 WC Chemistry, Multidisciplinary SC Chemistry GA HK161 UT WOS:A1992HK16101136 ER PT J AU SHEINSON, RS DRISCOLL, DC BALDWIN, SP AF SHEINSON, RS DRISCOLL, DC BALDWIN, SP TI HALOGENATED FIRE SUPPRESSANT ACTION SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 USN,RES LAB,WASHINGTON,DC 20375. NR 1 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD APR 5 PY 1992 VL 203 BP 139 EP PHYS PN 2 PG 0 WC Chemistry, Multidisciplinary SC Chemistry GA HK162 UT WOS:A1992HK16202235 ER PT J AU GRATE, JW WENZEL, SW WHITE, RM AF GRATE, JW WENZEL, SW WHITE, RM TI SENSING TRANSITION BEHAVIORS IN POLYMER THIN-FILMS ON FLEXURAL PLATE WAVE DEVICES SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 USN,RES LAB,DIV CHEM,WASHINGTON,DC 20375. UNIV CALIF BERKELEY,BERKELEY SENSOR & ACTUATOR CTR,DEPT ELECT ENGN & COMP SCI,BERKELEY,CA 94720. UNIV CALIF BERKELEY,ELECTR RES LAB,BERKELEY,CA 94720. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD APR 5 PY 1992 VL 203 BP 159 EP ANYL PN 1 PG 0 WC Chemistry, Multidisciplinary SC Chemistry GA HK161 UT WOS:A1992HK16100505 ER PT J AU HONG, SS MILLER, DD HSU, FL GEORGE, C ROMSTEDT, KL FELLER, DR CUPPS, TL SLUSHER, KL LILLIBRIDGE, JP LYON, RA AF HONG, SS MILLER, DD HSU, FL GEORGE, C ROMSTEDT, KL FELLER, DR CUPPS, TL SLUSHER, KL LILLIBRIDGE, JP LYON, RA TI SEPARATION AND ALPHA-2-ADRENERGIC ACTIVITY OF THE OPTICAL ISOMERS OF 4-[1-(1-NAPHTHYL)ETHYL]-1H-IMIDAZOLE SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 OHIO STATE UNIV,COLL PHARM,COLUMBUS,OH 43210. USN,RES LAB,WASHINGTON,DC 20375. PROCTER & GAMBLE CO,CINCINNATI,OH 45239. USA CHEM RES,CTR DEV & ENGN,ABERDEEN PROVING GROUND,MD 21010. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD APR 5 PY 1992 VL 203 BP 163 EP MEDI PN 2 PG 0 WC Chemistry, Multidisciplinary SC Chemistry GA HK162 UT WOS:A1992HK16200363 ER PT J AU CAPPS, RN AF CAPPS, RN TI COMPARISON OF DIELECTRIC AND VISCOELASTIC RELAXATIONS IN CHLOROBUTYL RUBBER AS A FUNCTION OF CURE SYSTEMS SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 TRI TESSCO,ORLANDO,FL 32856. USN,RES LAB,ORLANDO,FL 32856. NR 0 TC 0 Z9 0 U1 0 U2 1 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD APR 5 PY 1992 VL 203 BP 168 EP PMSE PN 3 PG 0 WC Chemistry, Multidisciplinary SC Chemistry GA HK163 UT WOS:A1992HK16300790 ER PT J AU RAMAKER, DE TURNER, NH MILLIKEN, JA AF RAMAKER, DE TURNER, NH MILLIKEN, JA TI THE NATURE OF CORE EXCITED-STATES IN C-60 AS EXHIBITED BY THE AUGER LINE-SHAPE SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 GEORGE WASHINGTON UNIV,DEPT CHEM,WASHINGTON,DC 20052. 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 APR 5 PY 1992 VL 203 BP 182 EP PHYS PN 2 PG 0 WC Chemistry, Multidisciplinary SC Chemistry GA HK162 UT WOS:A1992HK16202278 ER PT J AU LEE, KE HIGA, KT JOHNSON, CE NISSAN, RA BUTCHER, RJ AF LEE, KE HIGA, KT JOHNSON, CE NISSAN, RA BUTCHER, RJ TI THE SYNTHESIS, CHARACTERIZATION, AND FILM GROWTH-STUDIES OF [T-BU2GAPR2]N (R = ET, I-PR, N = 2, R = T-BU, N = 1) SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 USN,CTR WEAP,RES DEPT,DIV RES,CHINA LAKE,CA 93555. HOWARD UNIV,DEPT CHEM,WASHINGTON,DC 20059. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD APR 5 PY 1992 VL 203 BP 190 EP INOR PN 2 PG 0 WC Chemistry, Multidisciplinary SC Chemistry GA HK162 UT WOS:A1992HK16200600 ER PT J AU SINGH, A MARKOWITZ, M TSAO, LI AF SINGH, A MARKOWITZ, M TSAO, LI TI MODULATION OF BILAYER STRUCTURES FROM DIACETYLENIC PHOSPHOCHOLINES BY INCLUSION OF O-LINKERS-BETA TO DIACETYLENE 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 1 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD APR 5 PY 1992 VL 203 BP 197 EP PMSE PN 3 PG 0 WC Chemistry, Multidisciplinary SC Chemistry GA HK163 UT WOS:A1992HK16300819 ER PT J AU CHRISTODOULOU, D WINK, DA KEEFER, LK GEORGE, C AF CHRISTODOULOU, D WINK, DA KEEFER, LK GEORGE, C TI NITRIC OXIDE-NUCLEOPHILE COMPLEXES AS LIGANDS - A NEW CLASS OF MIXED-LIGAND COPPER(II) COMPLEXES SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 NCI,FREDRICK CANC RES DEV CTR,COMPARAT CARCINOGENESIS LAB,CHEM SECT,FREDERICK,MD 21702. USN,RES LAB,STRUCT MATTER LAB,WASHINGTON,DC 20375. 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 APR 5 PY 1992 VL 203 BP 217 EP INOR PN 2 PG 0 WC Chemistry, Multidisciplinary SC Chemistry GA HK162 UT WOS:A1992HK16200627 ER PT J AU FU, SS MALAFSKY, GP HSU, DSY AF FU, SS MALAFSKY, GP HSU, DSY TI INVESTIGATION OF SURFACE-DEFECTS USING PHOTOEMISSION OF ADSORBED XENON (PAX) 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 APR 5 PY 1992 VL 203 BP 226 EP COLL PN 1 PG 0 WC Chemistry, Multidisciplinary SC Chemistry GA HK161 UT WOS:A1992HK16101741 ER PT J AU ARMISTEAD, JP SNOW, AW AF ARMISTEAD, JP SNOW, AW TI ETHER LINKED DICYANATE RESIN - SPECIFIC VOLUME DEPENDENCE ON CONVERSION SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 USN,RES LAB,WASHINGTON,DC 20375. 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 APR 5 PY 1992 VL 203 BP 233 EP PMSE PN 3 PG 0 WC Chemistry, Multidisciplinary SC Chemistry GA HK163 UT WOS:A1992HK16300855 ER PT J AU SNOW, AW GRIFFITH, JR SOULEN, RL GREATHOUSE, JA LODGE, JK AF SNOW, AW GRIFFITH, JR SOULEN, RL GREATHOUSE, JA LODGE, JK TI SYNTHESIS OF A LOW DIELECTRIC PERFLUOROHEXAMETHYLENE LINKED CYANATE RESIN SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 USN,RES LAB,WASHINGTON,DC 20375. SOUTHWESTERN UNIV,DEPT CHEM,GEORGETOWN,TX 78626. SFA INC,LANDOVER,MD 20785. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD APR 5 PY 1992 VL 203 BP 237 EP PMSE PN 3 PG 0 WC Chemistry, Multidisciplinary SC Chemistry GA HK163 UT WOS:A1992HK16300859 ER PT J AU BRENNER, DW HARRISON, JA COLTON, RJ WHITE, CT AF BRENNER, DW HARRISON, JA COLTON, RJ WHITE, CT TI NANOMETER-SCALE TRIBOLOGICAL PROPERTIES OF NEW CARBON-BASED MATERIALS FROM MOLECULAR-DYNAMICS SIMULATIONS SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 USN,RES LAB,WASHINGTON,DC 20375. RI Brenner, Donald/D-1741-2009 NR 0 TC 0 Z9 0 U1 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 APR 5 PY 1992 VL 203 BP 243 EP COLL PN 1 PG 0 WC Chemistry, Multidisciplinary SC Chemistry GA HK161 UT WOS:A1992HK16101758 ER PT J AU SLUTSKER, L ADAMS, WW ROLAND, CM AF SLUTSKER, L ADAMS, WW ROLAND, CM TI MORPHOLOGICAL HETEROGENEITY ALONG AND ACROSS THE FIBER AXIS SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 USN,RES LAB,DIV CHEM,WASHINGTON,DC 20375. AMOCO FABR & FIBERS CO,CTR RES & DEV,ATLANTA,GA 30336. USAF,WRIGHT LAB,MAT DIRECTORATE,WRIGHT PATTERSON AFB,OH 45433. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD APR 5 PY 1992 VL 203 BP 251 EP POLY PN 3 PG 0 WC Chemistry, Multidisciplinary SC Chemistry GA HK163 UT WOS:A1992HK16300247 ER PT J AU SNOW, AW ARMISTEAD, JP AF SNOW, AW ARMISTEAD, JP TI COMPARATIVE CYANATE AND EPOXY-RESIN HYDROGEN-BONDING STUDIES SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 USN,RES LAB,WASHINGTON,DC 20375. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD APR 5 PY 1992 VL 203 BP 260 EP PMSE PN 3 PG 0 WC Chemistry, Multidisciplinary SC Chemistry GA HK163 UT WOS:A1992HK16300882 ER PT J AU KELLER, TM AF KELLER, TM TI STRONG ORGANIC-ACID CURED PHTHALONITRILE RESINS FOR HIGH-TEMPERATURE APPLICATIONS SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 USN,RES LAB,CHEM MAT BRANCH,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 APR 5 PY 1992 VL 203 BP 262 EP POLY PN 3 PG 0 WC Chemistry, Multidisciplinary SC Chemistry GA HK163 UT WOS:A1992HK16300258 ER PT J AU HONEYCHUCK, RV HO, T WYNNE, KJ AF HONEYCHUCK, RV HO, T WYNNE, KJ TI PREPARATION AND CHARACTERIZATION OF POLYURETHANES BASED ON A SERIES OF FLUORINATED DIOLS 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. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD APR 5 PY 1992 VL 203 BP 267 EP PMSE PN 3 PG 0 WC Chemistry, Multidisciplinary SC Chemistry GA HK163 UT WOS:A1992HK16300889 ER PT J AU RAPPOLI, BJ MCGRATH, KJ GEORGE, CF AF RAPPOLI, BJ MCGRATH, KJ GEORGE, CF TI REACTIVITY OF RUTHENIUM DIMERS IN THE PRESENCE OF GROUP-15 LIGANDS SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 USN,RES LAB,DIV CHEM,WASHINGTON,DC 20375. USN,RES LAB,STRUCT MATTER LAB,WASHINGTON,DC 20375. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD APR 5 PY 1992 VL 203 BP 314 EP INOR PN 2 PG 0 WC Chemistry, Multidisciplinary SC Chemistry GA HK162 UT WOS:A1992HK16200724 ER PT J AU LINDSAY, GA HENRY, RA HOOVER, JM KNOESEN, A MORTAZAVI, MA AF LINDSAY, GA HENRY, RA HOOVER, JM KNOESEN, A MORTAZAVI, MA TI NEAR-TG RELAXATION BEHAVIOR IN NONLINEAR OPTICAL POLYMERS AND VIEWS ON PHYSICAL AGING SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 USN,CTR WEAP,RES DEPT,DIV CHEM,POLYMER SCI BRANCH,CHINA LAKE,CA 93555. UNIV CALIF DAVIS,DEPT ELECT ENGN & COMP SCI,DAVIS,CA 95616. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD APR 5 PY 1992 VL 203 BP 329 EP POLY PN 3 PG 0 WC Chemistry, Multidisciplinary SC Chemistry GA HK163 UT WOS:A1992HK16300321 ER PT J AU WILLER, RL STERN, AG CUNKLE, G EATON, PE PRAMOD, K GILARDI, RD FLIPPENANDERSEN, JL AF WILLER, RL STERN, AG CUNKLE, G EATON, PE PRAMOD, K GILARDI, RD FLIPPENANDERSEN, JL TI SYNTHESIS AND CHEMISTRY OF NITRAMINO AND DINITRAMINO SUBSTITUTED CUBANES SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 THIOKOL CORP,ELKTON DIV,ELKTON,MD 21921. UNIV CHICAGO,SEARLE CHEM LAB,CHICAGO,IL 60637. USN,RES LAB,WASHINGTON,DC 20375. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD APR 5 PY 1992 VL 203 BP 427 EP ORGN PN 2 PG 0 WC Chemistry, Multidisciplinary SC Chemistry GA HK162 UT WOS:A1992HK16201811 ER PT J AU DAVE, PR FOROHAR, F AXENROD, T BEDFORD, CD AF DAVE, PR FOROHAR, F AXENROD, T BEDFORD, CD TI REACTION OF HEXACHLOROCYCLOTRIPHOSPHAZENE WITH N,N'-BIS(TRIMETHYLSILYL)ETHYLENEDIAMINE SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 ARDEC,GEO CTR INC,LAKE HOPATCONG,NJ 07849. CUNY CITY COLL,NEW YORK,NY 10031. USN,CTR SURFACE WARFARE,SILVER SPRING,MD 20903. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD APR 5 PY 1992 VL 203 BP 461 EP ORGN PN 2 PG 0 WC Chemistry, Multidisciplinary SC Chemistry GA HK162 UT WOS:A1992HK16201845 ER PT J AU MILLER, JB CORY, DG GARROWAY, AN AF MILLER, JB CORY, DG GARROWAY, AN TI SOLID-STATE NMR IMAGING OF POLYMERS 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 APR 5 PY 1992 VL 203 BP 541 EP POLY PN 3 PG 0 WC Chemistry, Multidisciplinary SC Chemistry GA HK163 UT WOS:A1992HK16300528 ER PT J AU THIBODEAUX, AF GEER, R QADRI, S ADAMS, J NACIRI, J SHASHIDHAR, R DURAN, RS AF THIBODEAUX, AF GEER, R QADRI, S ADAMS, J NACIRI, J SHASHIDHAR, R DURAN, RS TI LANGMUIR-BLODGETT MULTILAYER FILMS OF A FERROELECTRIC LIQUID-CRYSTALLINE COPOLYMER USING AN ALTERNATE DEPOSITION METHOD SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 UNIV FLORIDA,CTR MACROMOLEC SCI & ENGN,DEPT CHEM,GAINESVILLE,FL 32611. USN,RES LAB,CTR BIOMOLEC SCI & ENGN,WASHINGTON,DC 20375. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD APR 5 PY 1992 VL 203 BP 635 EP POLY PN 3 PG 0 WC Chemistry, Multidisciplinary SC Chemistry GA HK163 UT WOS:A1992HK16300621 ER PT J AU FITZGERALD, J HAGGERTY, B RHEINGOLD, A MAY, L BREWER, G AF FITZGERALD, J HAGGERTY, B RHEINGOLD, A MAY, L BREWER, G TI IRON OCTAETHYLTETRAAZAPORPHYRINS - SYNTHESIS, CHARACTERIZATION AND COMPARISON TO RELATED MACROCYCLES SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 USN ACAD,DEPT CHEM,ANNAPOLIS,MD 21402. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD APR 5 PY 1992 VL 203 BP 807 EP INOR PN 2 PG 0 WC Chemistry, Multidisciplinary SC Chemistry GA HK162 UT WOS:A1992HK16201215 ER PT J AU NIKLINSKA, BB YAMADA, H OSHEA, JJ JUNE, CH ASHWELL, JD AF NIKLINSKA, BB YAMADA, H OSHEA, JJ JUNE, CH ASHWELL, JD TI TYROSINE KINASE-REGULATED AND INOSITOL PHOSPHATE-INDEPENDENT CA2+ ELEVATION AND MOBILIZATION IN T-CELLS SO JOURNAL OF BIOLOGICAL CHEMISTRY LA English DT Article ID ANTIGEN RECEPTOR; SIGNAL TRANSDUCTION; PROTEIN-PHOSPHORYLATION; PHOSPHOLIPID BREAKDOWN; MONOCLONAL-ANTIBODY; ACTIVATION; CALCIUM; EXPRESSION; COMPLEX; CA-2+ AB Perturbation of the T cell antigen-specific receptor leads to a series of signaling events that includes a rapid increase in phosphoinositide hydrolysis, intracellular Ca2+, and tyrosine phosphorylation. We have examined the function of tyrosine phosphorylation in isolation by introducing the v-src tyrosine kinase into a T cell hybridoma. T cell receptor-mediated increases in phosphoinositide hydrolysis and, in particular the generation of inositol 1,4,5-trisphosphate, were comparable between v-src+ and v-src- cells. Unexpectedly, the v-src+ cells exhibited spontaneously elevated intracellular Ca2+ and exaggerated Ca2+ increases when stimulated via the T cell receptor. The enhanced Ca2+ response was not due to tyrosine phosphorylation of the T cell receptor itself, since the phenotype was evident in T cell receptor zeta-chain-/v-src+ cells as well. These results demonstrate that an active protein tyrosine kinase can markedly affect intracellular Ca2+ handling by a process independent of inositol 1,4,5-trisphosphate production and T cell receptor tyrosine phosphorylation and raise the possibility that tyrosine kinases may directly regulate T cell receptor-mediated changes in intracellular Ca2+. C1 USN,IMMUNE CELL BIOL PROGRAM,MED RES INST,BETHESDA,MD 20889. NCI,FREDERICK CANC RES & DEV CTR,EXPTL IMMUNOL LAB,BIOL RESPONSE MODIFIERS PROGRAM,FREDERICK,MD 21702. RP NIKLINSKA, BB (reprint author), NIH,IMMUNE CELL BIOL SECT,BIOL RESPONSE MODIFIERS PROGRAM,BETHESDA,MD 20892, USA. NR 41 TC 43 Z9 43 U1 0 U2 0 PU AMER SOC BIOCHEMISTRY MOLECULAR BIOLOGY INC PI BETHESDA PA 9650 ROCKVILLE PIKE, BETHESDA, MD 20814 SN 0021-9258 J9 J BIOL CHEM JI J. Biol. Chem. PD APR 5 PY 1992 VL 267 IS 10 BP 7154 EP 7159 PG 6 WC Biochemistry & Molecular Biology SC Biochemistry & Molecular Biology GA HM053 UT WOS:A1992HM05300107 PM 1551921 ER PT J AU GARLAND, NL NELSON, HH AF GARLAND, NL NELSON, HH TI TEMPERATURE-DEPENDENCE OF THE KINETICS OF THE REACTION AL+O2-]ALO+O SO CHEMICAL PHYSICS LETTERS LA English DT Article ID LASER FLUORESCENCE; HTFFR KINETICS; ALO; ALUMINUM; ENERGY; OXYGEN; MATRIX; STATE AB The temperature and pressure dependence of the rate constant for the reaction Al + O2 has been measured by observing both Al disappearance and AlO appearance. No pressure dependence is observed from 10 to 100 Torr total pressure of Ar at room temperature. Over the range 298-1083 K, a fit to the measured data yields the expression k(T) = (1.62 +/- 0.13) x 10(-10) cm3 s-1 exp [(-0.16 +/- 0.08) kcal mol-1/RT]. RP GARLAND, NL (reprint author), USN,RES LAB,DIV CHEM,CODE 6110,WASHINGTON,DC 20375, USA. NR 22 TC 31 Z9 31 U1 1 U2 11 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0009-2614 J9 CHEM PHYS LETT JI Chem. Phys. Lett. PD APR 3 PY 1992 VL 191 IS 3-4 BP 269 EP 272 DI 10.1016/0009-2614(92)85299-P PG 4 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA HP150 UT WOS:A1992HP15000011 ER PT J AU STEVENS, MH STROBEL, DF SUMMERS, ME YELLE, RV AF STEVENS, MH STROBEL, DF SUMMERS, ME YELLE, RV TI ON THE THERMAL STRUCTURE OF TRITON THERMOSPHERE SO GEOPHYSICAL RESEARCH LETTERS LA English DT Article ID ZERO DENSITY; NEPTUNE; PLASMA AB The analysis of the Voyager 2 Ultraviolet Spectrometer (UVS) solar occultation data obtained at Triton is consistent with a spherically symmetric, isothermal thermosphere above 400 km at T infinity = 96 K. A detailed calculation of energy loss processes in a pure N2 atmosphere, heating and cooling rates, and resultant thermal structure associated with solar UV irradiance and magnetospheric electron precipitation indicates that solar heating, with calculated T infinity = 70 K, is insufficient to account for the inferred T infinity = 96 K. The magnetosphere must deposit twice as much power as the sun (lambda < 800 angstrom) to heat the thermosphere to 96 K and generate the observed N2 tangential column densities above 450 km. The thermal escape of H and N atoms and the downward diffusion of N atoms to recombine below 130 km results in local ionospheric heating efficiency of 24%. An upper limit on the tropopause CO mixing ratio of 2 x 10(-4) is inferred in the absence of aerosol heating to balance its efficient cooling by LTE rotational line emission. C1 JOHNS HOPKINS UNIV,DEPT PHYS & ASTRON,BALTIMORE,MD 21218. USN,RES LAB,EO HULBURT CTR SPACE RES,WASHINGTON,DC 20375. UNIV ARIZONA,LUNAR & PLANETARY LAB,TUCSON,AZ 85721. RP STEVENS, MH (reprint author), JOHNS HOPKINS UNIV,DEPT EARTH & PLANETARY SCI,BALTIMORE,MD 21218, USA. NR 20 TC 23 Z9 23 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 3 PY 1992 VL 19 IS 7 BP 669 EP 672 DI 10.1029/92GL00651 PG 4 WC Geosciences, Multidisciplinary SC Geology GA HM703 UT WOS:A1992HM70300009 ER PT J AU KOON, NC AYLESWORTH, KD HARRIS, VG DAS, BN AF KOON, NC AYLESWORTH, KD HARRIS, VG DAS, BN TI MAGNETIC-PROPERTIES OF FERRIMAGNETIC RARE-EARTH-TRANSITION-METAL FILMS AND MULTILAYERS SO JOURNAL OF ALLOYS AND COMPOUNDS LA English DT Article ID MAGNETORESISTANCE; SUPERLATTICES AB In this paper we present a brief report on magnetization studies of three different types of rare-earth-transition-metal ferrimagnetic thin films. The first consists of compositionally modulated Gd0.15Fe0.85/Gd0.40Fe0.60 where the two compositions are on different sides of the magnetic compensation point (Gd0.26Fe0.74) at room temperature. The compositionally modulated layers therefore form an artificial (macroscopic) superlattice antiferromagnet which exhibits both spin-flop transitions and enhanced in-plane anisotropy owing to classical dipolar effects. We also report magnetization measurements on a homogeneous film of Tb0.23Fe0.77, which exhibits large perpendicular anisotropy typical of amorphous TbFe thin films as well as a spin-flop transition near 60 kOe. Finally, we present data on a film of Gd0.40Fe0.60(300 angstrom)/Fe(10 angstrom)/Pd(100 angstrom)/Fe(30 angstrom) which demonstrates a practical method of determining the strength of ferromagnetic coupling between two magnetic layers from simple magnetization measurements. RP KOON, NC (reprint author), USN,RES LAB,CODE 6342,WASHINGTON,DC 20375, USA. NR 12 TC 1 Z9 1 U1 2 U2 4 PU ELSEVIER SCIENCE SA LAUSANNE PI LAUSANNE 1 PA PO BOX 564, 1001 LAUSANNE 1, SWITZERLAND SN 0925-8388 J9 J ALLOY COMPD JI J. Alloy. Compd. PD APR 3 PY 1992 VL 181 BP 409 EP 418 DI 10.1016/0925-8388(92)90336-8 PG 10 WC Chemistry, Physical; Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Chemistry; Materials Science; Metallurgy & Metallurgical Engineering GA HP963 UT WOS:A1992HP96300045 ER PT J AU HARRIS, VG AYLESWORTH, KD ELAM, WT KOON, NC AF HARRIS, VG AYLESWORTH, KD ELAM, WT KOON, NC TI CORRELATION BETWEEN STRUCTURE AND MAGNETIC-ANISOTROPY IN AMORPHOUS FE-TB ALLOY-FILMS SO JOURNAL OF ALLOYS AND COMPOUNDS LA English DT Article ID DEPENDENCE AB Amorphous Fe-Tb alloy films exhibit very strong magnetic anisotropy favoring the direction perpendicular to the film plane, a characteristic which is very useful, for example, in magneto-optical recording. It has been suggested that this magnetic anisotropy arises from an anisotropic structural and/or chemical short-range order, although the experimental evidence for this is relatively weak. In order to understand the origins of this anisotropy we employed an element-specific, local structural probe to examine the atomic structure about both the iron and terbium atoms in a series of Fe-Tb films of varying compositions. Results of conversion-electron extended X-ray absorption fine structure (EXAFS) analysis reveal a short-range structural anisotropy in both the iron and terbium atomic environments between the directions parallel and perpendicular to the film plane. We can quantitatively describe the structural anisotropy about the iron atom in terms of changes in nearest neighbor and next-nearest neighbor coordination. Although detailed analysis of the structural anisotropy around the terbium atom is still in progress, it is clearly evident from the data that a short-range structural anisotropy is present in the local environment of terbium. Correlation of this structural anisotropy with the measured magnetic anisotropy illustrates a clear trend, strongly suggesting that this short-range structural anisotropy is the origin of the perpendicular magnetic anisotropy observed in these films. RP HARRIS, VG (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 16 TC 8 Z9 8 U1 1 U2 5 PU ELSEVIER SCIENCE SA LAUSANNE PI LAUSANNE 1 PA PO BOX 564, 1001 LAUSANNE 1, SWITZERLAND SN 0925-8388 J9 J ALLOY COMPD JI J. Alloy. Compd. PD APR 3 PY 1992 VL 181 BP 431 EP 443 DI 10.1016/0925-8388(92)90338-A PG 13 WC Chemistry, Physical; Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Chemistry; Materials Science; Metallurgy & Metallurgical Engineering GA HP963 UT WOS:A1992HP96300047 ER PT J AU KARLE, JM KARLE, IL GORDON, RK CHIANG, PK AF KARLE, JM KARLE, IL GORDON, RK CHIANG, PK TI RELATIONSHIP OF 3-DIMENSIONAL STRUCTURE OF MUSCARINIC ANTAGONISTS TO ANTIMUSCARINIC ACTIVITY - STRUCTURE OF THIODEACYLAPROPHEN HYDROCHLORIDE SO ACTA CRYSTALLOGRAPHICA SECTION B-STRUCTURAL SCIENCE LA English DT Article ID RECEPTORS; APROPHEN; AZAPROPHEN; ANALOGS; AGENT AB C20H28NS+ .Cl-, 2-(diethylamino)ethyl 1,1-diphenylethyl sulfide hydrochloride (thiodeacylaprophen hydrochloride), M(r) = 349.9, orthorhombic, P2(1)2(1)2(1), a = 8.933 (2), b = 11.710 (3), c = 18.934 (4) angstrom, V = 1980.6 (7) angstrom 3, Z = 4, D(x) = 1.173 g cm-3, Cu k(alpha), lambda = 1.54178 angstrom, mu = 26.70 cm-1, F(000) = 752, room temperature, final R = 4.1% for 1417 reflections with \F0\ > 3-sigma(F). Thiodeacylaprophen crystallized as a tertiary amine hydrochloride salt. The S-C-C-N+ segment adopts a trans configuration as does one of the C(phenyl)-C-S-C segments. A comparison of the structure of thiodeacylaprophen with the crystal structures of poten antimuscarinic agents suggests that the relatively weak antimuscarinic activity of thiodeacylaprophen compared to atropine and aprophen may be substantially due to the short intramolecular S...N+ distance of 4.106 (6) angstrom. Other contributing structural factors may include the direction of the N+-H bond and restricted accessibility of the sulfur atom for interatomic interactions. C1 USN,RES LAB,STRUCT MATTER LAB,WASHINGTON,DC 20375. WALTER REED ARMY MED CTR,DIV BIOCHEM,WASHINGTON,DC 20307. RP KARLE, JM (reprint author), WALTER REED ARMY MED CTR,DEPT PHARMACOL,DIV EXPTL THERAPEUT,WASHINGTON,DC 20307, USA. NR 27 TC 3 Z9 3 U1 0 U2 1 PU MUNKSGAARD INT PUBL LTD PI COPENHAGEN PA 35 NORRE SOGADE, PO BOX 2148, DK-1016 COPENHAGEN, DENMARK SN 0108-7681 J9 ACTA CRYSTALLOGR B JI Acta Crystallogr. Sect. B-Struct. Commun. PD APR 1 PY 1992 VL 48 BP 208 EP 213 DI 10.1107/S0108768191013149 PN 2 PG 6 WC Chemistry, Multidisciplinary; Crystallography SC Chemistry; Crystallography GA HP118 UT WOS:A1992HP11800014 PM 1515109 ER PT J AU VANDERMEER, RA MASUMURA, RA AF VANDERMEER, RA MASUMURA, RA TI THE MICROSTRUCTURAL PATH OF GRAIN-BOUNDARY-NUCLEATED PHASE-TRANSFORMATIONS SO ACTA METALLURGICA ET MATERIALIA LA English DT Article ID RECRYSTALLIZATION AB Microstructural path functions, S(v)(t) = f{X(v)(t)}, where X(v) is the volume fraction transformed and S(v) is the interfacial area per unit volume (separating transformed from untransformed material), are derived for transformations in which the product phase nucleates either at parent phase grain boundaries, grain edges or grain corners and grows at a constant rate. The treatment considers that either there is a fixed number of pre-existing nuclei, or nucleation is at a constant rate, or some combination of these two means of nucleation are operative. The rate equations for X(v) are deduced using existing formalisms and by using the same basic premises to treat the problem of impingement, the S(v) rate equations are derived for the first time. The microstructural path functions are obtained by eliminating time from these rate equations. An example of the usefulness of the microstructural path function to model recrystallization in an aluminum-gold alloy is presented. RP VANDERMEER, RA (reprint author), USN, RES LAB, DIV MAT SCI & TECHNOL, WASHINGTON, DC 20375 USA. NR 21 TC 25 Z9 28 U1 0 U2 0 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLAND SN 0956-7151 J9 ACTA METALL MATER JI Acta Metall. Mater. PD APR PY 1992 VL 40 IS 4 BP 877 EP 886 DI 10.1016/0956-7151(92)90031-9 PG 10 WC Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Materials Science; Metallurgy & Metallurgical Engineering GA HJ890 UT WOS:A1992HJ89000031 ER PT J AU PANCRAZIO, JJ OIE, HK KIM, YI AF PANCRAZIO, JJ OIE, HK KIM, YI TI VOLTAGE-SENSITIVE CALCIUM CHANNELS IN A HUMAN SMALL-CELL LUNG-CANCER CELL-LINE SO ACTA PHYSIOLOGICA SCANDINAVICA LA English DT Article DE CA2+ CHANNELS; LAMBERT-EATON SYNDROME; PATCH-CLAMP; SMALL-CELL LUNG CANCER ID EATON MYASTHENIC SYNDROME; BOMBESIN-LIKE PEPTIDES; VERTEBRATE CELLS; OMEGA-CONOTOXIN; CARCINOMA; MODULATION; SECRETION; CURRENTS AB Utilizing the whole-cell patch-clamp method we assessed the Ca2+ current (I(Ca)) in well-established cell lines from human small-cell carcinoma (SCC) of the lung, NCI-H209 and NCI-H187. The Ca2+ current was readily observed in H209 tumour cells (90% of the cells tested), whereas H187 tumour cells only occasionally expressed Ca2+ channels (26% of the cells tested). H209 Ca2+ current was evoked by potentials greater than -30 mV and exhibited partial inactivation over the duration of a 40 ms command potential. This inward current was unchanged by alteration of the holding potential from -80 to -40 mV and the activation phase of the Ca2+ current was best fitted by Hodgkin Huxley m(t)2 kinetics. H209 Ca2+ current was reduced over 80% by verapamil (100-mu-M), whereas w-conotoxin (5-mu-M) appeared to be without effect. In contrast, H209 Ca" current was rapidly abolished by nifedipine (10-mu-M), strongly suggesting the presence of L-type Ca2+ channels. Voltage-gated Ca2+ channels may be important to the secretion of ectopic hormones and the etiology and pathogenesis of Lambert-Eaton syndrome, an autoimmune disorder of the motor nerve terminal in which autoantibodies directed against voltage-gated Ca2+ channels are produced. C1 UNIV VIRGINIA,HLTH SCI CTR,DEPT BIOMED ENGN,BOX 377,CHARLOTTESVILLE,VA 22908. UNIV VIRGINIA,HLTH SCI CTR,DEPT NEUROL,CHARLOTTESVILLE,VA 22908. USN HOSP,NCI,MED ONCOL BRANCH,BETHESDA,MD 20814. RI Pancrazio, Joseph/M-3206-2015 OI Pancrazio, Joseph/0000-0001-8276-3690 FU NINDS NIH HHS [NS18607] NR 27 TC 15 Z9 16 U1 0 U2 0 PU BLACKWELL SCIENCE LTD PI OXFORD PA OSNEY MEAD, OXFORD, OXON, ENGLAND OX2 0EL SN 0001-6772 J9 ACTA PHYSIOL SCAND JI Acta Physiol. Scand. PD APR PY 1992 VL 144 IS 4 BP 463 EP 468 DI 10.1111/j.1748-1716.1992.tb09321.x PG 6 WC Physiology SC Physiology GA HP006 UT WOS:A1992HP00600009 PM 1318636 ER PT J AU CAWLEY, R MAULDIN, RD AF CAWLEY, R MAULDIN, RD TI MULTIFRACTAL DECOMPOSITIONS OF MORAN FRACTALS SO ADVANCES IN MATHEMATICS LA English DT Article ID SPIN-GLASS PHASE; HAUSDORFF DIMENSION; STRANGE ATTRACTORS; SYSTEMS; TURBULENCE C1 UNIV N TEXAS,DEPT MATH,DENTON,TX 76203. RP CAWLEY, R (reprint author), USN,CTR SURFACE WARFARE,SILVER SPRING,MD 20903, USA. NR 32 TC 190 Z9 199 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 0001-8708 J9 ADV MATH JI Adv. Math. PD APR PY 1992 VL 92 IS 2 BP 196 EP 236 DI 10.1016/0001-8708(92)90064-R PG 41 WC Mathematics SC Mathematics GA HN576 UT WOS:A1992HN57600002 ER PT J AU FALCOVITZ, J FUHS, AE AF FALCOVITZ, J FUHS, AE TI SEMI-INVERSE MARCHING CHARACTERISTICS SCHEME FOR SUPERSONIC FLOWS SO AIAA JOURNAL LA English DT Note C1 USN,POSTGRAD SCH,SPACE SYST ACAD GRP,MONTEREY,CA 93941. NR 3 TC 1 Z9 1 U1 0 U2 0 PU AMER INST AERONAUT ASTRONAUT PI RESTON PA 1801 ALEXANDER BELL DRIVE, STE 500, RESTON, VA 22091 SN 0001-1452 J9 AIAA J JI AIAA J. PD APR PY 1992 VL 30 IS 4 BP 1128 EP 1130 DI 10.2514/3.11038 PG 3 WC Engineering, Aerospace SC Engineering GA HM681 UT WOS:A1992HM68100037 ER PT J AU ISENBERG, MT AF ISENBERG, MT TI IMAGE AS ARTIFACT - THE HISTORICAL-ANALYSIS OF FILM AND TELEVISION - OCONNOR,JE SO AMERICAN HISTORICAL REVIEW LA English DT Book Review RP ISENBERG, MT (reprint author), USN ACAD,ANNAPOLIS,MD 21402, USA. NR 1 TC 1 Z9 1 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 1992 VL 97 IS 2 BP 630 EP 631 DI 10.2307/2165893 PG 2 WC History SC History GA HP914 UT WOS:A1992HP91400183 ER PT J AU MARTIN, RA CUNNIFF, C ERICKSON, L JONES, KL AF MARTIN, RA CUNNIFF, C ERICKSON, L JONES, KL TI PENTALOGY-OF-CANTRELL AND ECTOPIA CORDIS, A FAMILIAL DEVELOPMENTAL FIELD COMPLEX SO AMERICAN JOURNAL OF MEDICAL GENETICS LA English DT Article DE PENTALOGY-OF-CANTRELL; ECTOPIA CORDIS; ANTERIOR DIAPHRAGMATIC HERNIA; MIDLINE; DEVELOPMENTAL FIELD; X-LINKED ID ANTERIOR ABDOMINAL-WALL; DIAPHRAGMATIC-HERNIA; DEFECTS; MIDLINE; ANOMALIES; HEART AB The association of sternal fusion defects with various cardiac, diaphragmatic, and anterior body wall defects represents a developmental field complex that includes the Pentalogy of Cantrell and ectopia cordis. No familial cases have been reported previously. We present 3 consecutively born brothers with extensive diaphragmatic defects, 2 who had the Pentalogy of Cantrell. One of the 2 also had ectopia cordis. C1 UNIV CALIF SAN DIEGO,MED CTR,DEPT PEDIAT,DIV DYSMORPHOL,225 DICKINSON ST,H814B,SAN DIEGO,CA 92103. BALBOA NAVAL HOSP,DEPT PEDIAT,SAN DIEGO,CA. UNIV ARKANSAS,DEPT PEDIAT,LITTLE ROCK,AR 72204. FU NIDDK NIH HHS [DK07318] NR 20 TC 39 Z9 44 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 0148-7299 J9 AM J MED GENET JI Am. J. Med. Genet. PD APR 1 PY 1992 VL 42 IS 6 BP 839 EP 841 DI 10.1002/ajmg.1320420619 PG 3 WC Genetics & Heredity SC Genetics & Heredity GA HK560 UT WOS:A1992HK56000018 PM 1554024 ER PT J AU GARLAND, FC GORHAM, ED CUNNION, SO MILLER, MR BALAZS, LL AF GARLAND, FC GORHAM, ED CUNNION, SO MILLER, MR BALAZS, LL TI DECLINE IN HUMAN-IMMUNODEFICIENCY-VIRUS SEROPOSITIVITY AND SEROCONVERSION IN US NAVY ENLISTED PERSONNEL - 1986 TO 1989 SO AMERICAN JOURNAL OF PUBLIC HEALTH LA English DT Note ID STATES MILITARY SERVICE; INTRAVENOUS DRUG-USERS; UNITED-STATES; SAN-FRANCISCO; HIV-INFECTION; BISEXUAL MEN; OCTOBER 1985; YOUNG-ADULTS; AIDS; PREVALENCE AB The US Navy administered 1 795 578 enzyme-linked immunosorbent assay (ELISA) tests to 848 632 active-duty Navy enlisted personnel during 1986 to 1989. This study identified 2438 human immunodeficiency virus (HIV)-seropositive active-duty enlisted Navy personnel, including 778 seroconverters. Three types of quarterly rates of HIV seropositivity and seroconversion were determined. All three rates declined. This decline could not be explained by changes in the population tested according to age, race, sex, occupation, or geographic location of home port. C1 UNIV CALIF SAN DIEGO,DEPT COMMUNITY & FAMILY MED,LA JOLLA,CA 92093. UNIFORMED SERV UNIV HLTH SCI,BETHESDA,MD 20814. RP GARLAND, FC (reprint author), USN,HLTH RES CTR,DEPT HLTH SCI & EPIDEMIOL,DIV EPIDEMIOL,POB 85122,SAN DIEGO,CA 92186, USA. NR 26 TC 7 Z9 7 U1 0 U2 0 PU AMER PUBLIC HEALTH ASSOC INC PI WASHINGTON PA 1015 FIFTEENTH ST NW, WASHINGTON, DC 20005 SN 0090-0036 J9 AM J PUBLIC HEALTH JI Am. J. Public Health PD APR PY 1992 VL 82 IS 4 BP 581 EP 584 DI 10.2105/AJPH.82.4.581 PG 4 WC Public, Environmental & Occupational Health SC Public, Environmental & Occupational Health GA HT246 UT WOS:A1992HT24600018 PM 1546779 ER PT J AU KERN, JA ROBINSON, RA GAZDAR, A TORNEY, L WEINER, DB AF KERN, JA ROBINSON, RA GAZDAR, A TORNEY, L WEINER, DB TI MECHANISMS OF P185(HER2) EXPRESSION IN HUMAN NON-SMALL-CELL LUNG-CANCER CELL-LINES SO AMERICAN JOURNAL OF RESPIRATORY CELL AND MOLECULAR BIOLOGY LA English DT Article ID GROWTH-FACTOR RECEPTOR; RIBONUCLEIC-ACID; PROTEIN P185NEU; NEU ONCOGENE; HUMAN-BREAST; GENE; AMPLIFICATION; FRAGMENTS; CARCINOMA; LIGAND AB To identify mechanisms that allow p185HER2 expression in lung cancer, we performed Western, Southern, and Northern blot analyses of 14 cell lines derived from human non-small cell lung carcinomas and one cell line derived from a human mesothelioma. Human bronchiole epithelial cells and rat type II pneumocytes were found to express p185HER2 at low to undetectable levels by Western blot technique. In contrast, 13 lung cancer cell lines expressed p185HER2, and eight of these 13 expressed p185HER2 at levels at least 2-fold higher than that found in normal bronchiole epithelial cells or type II pneumocytes. Genomic Southern analysis showed that amplification of the HER2 gene was present in only one of the eight cell lines that expressed p185HER2 at these higher levels. Increased levels of steady-state HER2 mRNA occurred in the remaining seven cell lines. We conclude that in human non-small cell lung carcinoma cell lines the most common mechanism resulting in increased p185HER2 expression is due to mechanisms that increase HER2 mRNA levels, with HER2 gene amplification occurring less commonly. C1 UNIV IOWA,COLL MED,DEPT PATHOL,IOWA CITY,IA 52242. UNIV PENN,SCH MED,DEPT MED,PHILADELPHIA,PA 19104. UNIV PENN,SCH MED,DEPT PATHOL & LAB MED,PHILADELPHIA,PA 19104. NCI,BETHESDA,MD 20892. USN HOSP,BETHESDA,MD 20814. RP KERN, JA (reprint author), UNIV IOWA,COLL MED,DEPT INTERNAL MED,ROOM C-33A,GH,IOWA CITY,IA 52242, USA. RI Weiner, David/H-8579-2014 FU NHLBI NIH HHS [HL-01575] NR 23 TC 40 Z9 41 U1 0 U2 2 PU AMER LUNG ASSOC PI NEW YORK PA 1740 BROADWAY, NEW YORK, NY 10019 SN 1044-1549 J9 AM J RESP CELL MOL JI Am. J. Respir. Cell Mol. Biol. PD APR PY 1992 VL 6 IS 4 BP 359 EP 363 PG 5 WC Biochemistry & Molecular Biology; Cell Biology; Respiratory System SC Biochemistry & Molecular Biology; Cell Biology; Respiratory System GA HL724 UT WOS:A1992HL72400002 PM 1312850 ER PT J AU STINE, GY AF STINE, GY TI HAVE LC LAB, WILL TRAVEL - TESTING PROPELLANT STABILITY AFTER OPERATION DESERT STORM SO ANALYTICAL CHEMISTRY LA English DT Article RP STINE, GY (reprint author), USN,CTR SURFACE WARFARE,PROPELLANT ANAL BRANCH,INDIAN HEAD,MD 20640, USA. 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 0003-2700 J9 ANAL CHEM JI Anal. Chem. PD APR 1 PY 1992 VL 64 IS 7 BP A453 EP A455 DI 10.1021/ac00031a002 PG 3 WC Chemistry, Analytical SC Chemistry GA HL044 UT WOS:A1992HL04400002 ER PT J AU JACOBSON, RD WILSON, SR ALJUMAILY, GA MCNEIL, JR BENNETT, JM MATTSSON, L AF JACOBSON, RD WILSON, SR ALJUMAILY, GA MCNEIL, JR BENNETT, JM MATTSSON, L TI MICROSTRUCTURE CHARACTERIZATION BY ANGLE-RESOLVED SCATTER AND COMPARISON TO MEASUREMENTS MADE BY OTHER TECHNIQUES SO APPLIED OPTICS LA English DT Article DE MICROSTRUCTURE CHARACTERIZATION; SCATTER; ANGLE-RESOLVED SCATTER; TOTAL INTEGRATED SCATTER; OPTICAL PROFILER; MECHANICAL PROFILER ID OPTICAL-SURFACES; STATISTICAL PROPERTIES; ROUGHNESS MEASUREMENTS AB The theory and measurement of angle-resolved scatter are described. Values of rms roughness that were obtained by using this technique to characterize four different materials are compared with values that were obtained by using a total integrated scatter measuring instrument, an optical profiler, and a mechanical profiler. The spatial frequency bandwidths and modulation transfer functions of the four instruments are different, and results are described in light of these differences. C1 UNIV NEW MEXICO,CTR HIGH TECHNOL MAT,DEPT ELECT & COMP ENGN,ALBUQUERQUE,NM 87131. USN,CTR WEAP,RES DEPT,DIV PHYS,CHINA LAKE,CA 93555. ROYAL INST TECHNOL,INST OPT RES,S-10044 STOCKHOLM 70,SWEDEN. NR 43 TC 22 Z9 22 U1 0 U2 1 PU OPTICAL SOC AMER PI WASHINGTON PA 2010 MASSACHUSETTS AVE NW, WASHINGTON, DC 20036 SN 0003-6935 J9 APPL OPTICS JI Appl. Optics PD APR 1 PY 1992 VL 31 IS 10 BP 1426 EP 1435 PG 10 WC Optics SC Optics GA HM110 UT WOS:A1992HM11000010 PM 20720774 ER PT J AU LEISTNER, AJ THWAITE, EG LESHA, F BENNETT, JM AF LEISTNER, AJ THWAITE, EG LESHA, F BENNETT, JM TI POLISHING STUDY USING TEFLON AND PITCH LAPS TO PRODUCE FLAT AND SUPERSMOOTH SURFACES SO APPLIED OPTICS LA English DT Article DE OPTICAL FABRICATION; OPTICAL POLISHING; ROUGHNESS; SURFACES; TEFLON LAP; CALCIUM FLUORIDE; MAGNESIUM FLUORIDE; LITHIUM NIOBATE; SILICON; ZERODUR AB Teflon polishing is compared with pitch polishing as a method for achieving supersmooth and flat optical surfaces. Because a Teflon lap wears slowly, it will retain its surface shape to produce extremely flat optical surfaces, lambda/100, consistently and reliably for extended periods of time, of the order of days. To compare the two methods, we polished 50-mm-diameter samples of various optical materials, using colloidal suspensions in water on both pitch and Teflon laps under the same polishing conditions. Flatness was maintained to better than lambda/10, and roughness less than 10 angstrom rms was measured on all samples by two Talystep surface-profiling instruments, one in the United States and one in Australia, with excellent agreement between measurements made by the two instruments. It was possible to obtain flat and smooth surfaces (< 4-angstrom rms roughness) on all materials (except for F4, flint glass), but only certain combinations of material, abrasive, and lap could be used to give the correct polishing conditions and surface chemistry. C1 USN,CTR WEAP,MICHELSON LAB,CHINA LAKE,CA 93555. RP LEISTNER, AJ (reprint author), CSIRO,DIV APPL PHYS,NATL MEASUREMENT LAB,POB 218,LINDFIELD,NSW 2070,AUSTRALIA. NR 8 TC 19 Z9 23 U1 1 U2 5 PU OPTICAL SOC AMER PI WASHINGTON PA 2010 MASSACHUSETTS AVE NW, WASHINGTON, DC 20036 SN 0003-6935 J9 APPL OPTICS JI Appl. Optics PD APR 1 PY 1992 VL 31 IS 10 BP 1472 EP 1482 PG 11 WC Optics SC Optics GA HM110 UT WOS:A1992HM11000016 PM 20720780 ER PT J AU NEE, SMF AF NEE, SMF TI ELLIPSOMETRIC VIEW ON REFLECTION AND SCATTERING FROM OPTICAL BLACKS SO APPLIED OPTICS LA English DT Article DE ELLIPSOMETRY; REFLECTION; SCATTERING; POLARIZATION; ROUGH SURFACE ID SURFACE-ROUGHNESS; SPECTROSCOPIC ELLIPSOMETRY; THIN-FILM AB The reflectance R(theta) and ellipsometric parameters for a black anodized aluminum sample were measured at wavelengths of 3.39 and 5.0-mu-m and at multiple incident angles. A three-phase model in which the dielectric constant for the rough layer is computed from Bruggeman's effective medium theory is used to reduce the ellipsometric data and to calculate the reference specular reflectance. Beckmann's scattering theory, modified for polarization effect, was used to reduce the reflectance data. A self-consistent solution was found in which the ellipsometric regressed effective thickness of the rough layer agrees with the reflectometric estimated roughness, and in which the measured reflectance data agree with Beckmann's scattering theory. RP NEE, SMF (reprint author), USN,CTR WEAP,RES DEPT,DIV PHYS,CHINA LAKE,CA 93555, USA. NR 20 TC 13 Z9 13 U1 0 U2 0 PU OPTICAL SOC AMER PI WASHINGTON PA 2010 MASSACHUSETTS AVE NW, WASHINGTON, DC 20036 SN 0003-6935 J9 APPL OPTICS JI Appl. Optics PD APR 1 PY 1992 VL 31 IS 10 BP 1549 EP 1556 PG 8 WC Optics SC Optics GA HM110 UT WOS:A1992HM11000025 PM 20720789 ER PT J AU CLAUSSEN, MJ SAHAI, R AF CLAUSSEN, MJ SAHAI, R TI SEST CO OBSERVATIONS OF GALAXIES IN THE GRUS QUARTET - NGC-7582 AND NGC-7552 SO ASTRONOMICAL JOURNAL LA English DT Article ID EMISSION; NUCLEUS AB We present CO (J = 1-0) maps of NGC 7582 and NGC 7552, two southern infrared-bright galaxies, using the SEST telescope. Although the general integrated properties of these galaxies fit well with those of large surveys of bright galaxies from the northern hemisphere, each of the galaxies have peculiarities in the CO maps. NGC 7582 shows an asymmetric, doubly peaked CO profile in the central region, which may be associated with an ionized gas disk in the nucleus. NGC 7552 has a very large concentration of molecular gas within the central 45", and suggests a nuclear starburst. Asymmetries in the CO profiles, and comparison with the H I profile, suggest that NGC 7552 has been tidally disturbed sometime in the past. Finally, the global CO to infrared luminosity ratio, and the CO luminosity to H I mass ratio for both NGC 7552 and NGC 7582 are in the high end of the range of these quantities for Seyfert 2 galaxies, despite the fact that only NGC 7582 shows Seyfert activity in the nucleus. C1 CHALMERS UNIV TECHNOL,INST THEORET PHYS,S-41296 GOTHENBURG,SWEDEN. GOTHENBURG UNIV,S-41296 GOTHENBURG,SWEDEN. RP CLAUSSEN, MJ (reprint author), USN,RES LAB,CTR ADV SPACE SENSING,CODE 42135,4555 OVERLOOK AVE SW,WASHINGTON,DC 20375, USA. NR 20 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 0004-6256 J9 ASTRON J JI Astron. J. PD APR PY 1992 VL 103 IS 4 BP 1134 EP 1137 DI 10.1086/116130 PG 4 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA HK359 UT WOS:A1992HK35900009 ER PT J AU HUMMEL, CA SCHALINSKI, CJ KRICHBAUM, TP RIOJA, MJ QUIRRENBACH, A WITZEL, A MUXLOW, TWB JOHNSTON, KJ MATVEYENKO, LI SHEVCHENKO, A AF HUMMEL, CA SCHALINSKI, CJ KRICHBAUM, TP RIOJA, MJ QUIRRENBACH, A WITZEL, A MUXLOW, TWB JOHNSTON, KJ MATVEYENKO, LI SHEVCHENKO, A TI THE JETS OF QUASAR 1928+738 - SUPERLUMINAL MOTION AND LARGE-SCALE STRUCTURE SO ASTRONOMY & ASTROPHYSICS LA English DT Article DE QUASARS, INDIVIDUAL; QUASARS, JETS OF ID VLA OBSERVATIONS; RADIO-SOURCES; MAGNETODYNAMICAL ACCELERATION; RELATIVISTIC JETS; VLBI OBSERVATIONS; MILLIARCSECOND AB The two-sided radio structure associated with the S5-quasar 1928 + 738 (z = 0.30) has been mapped at 408 and 1662 MHz with MERLIN, at resolutions of 1.5 and 0.2 arcsec, respectively. We investigate a geometrical and kinematical description of the curved jets in terms of a precessing beam model; moderate intrinsic brightness asymmetry of the jets has to be invoked to account for the apparent brightness ratio of jet to counterjet. This comparatively low ratio seems to contradict the existence of a one-sided milliarcsecond scale jet that has been reported to display superluminal motion. The mas scale jet structure may consist of boosted filaments embedded in a broad cylindrical jet. The results of five years' monitoring of the radio structure at 22 GHz with VLBI - at the highest angular resolution obtained for this source so far - display ballistic superluminal motion along a sinusoidally curved jet ridge line. Amongst three possible interpretations for this phenomenon, namely orbital motion of the central engine in a binary black hole system - which also could be responsible for the hypothetical precession, Kelvin-Helmholtz instabilities, or a helical magnetic field structure attached to a rotating accretion disk, only the last one might provide a realistic explanation of the observed phenomenon. The apparent velocity of the components observed at 22 GHz (4.Oc) is significantly lower than that observed at 5 GHz (6.5c) further down the jet by Witzel et al. (1988). C1 MAX PLANCK INST RADIOASTRON, W-5300 BONN 1, GERMANY. UNIV BONN, INST GEODAT, W-5300 BONN 1, GERMANY. INST ASTROFIS ANDALUCIA, E-18080 GRANADA, SPAIN. NUFFIELD RADIO ASTRON OBSERV LABS, MACCLESFIELD SK11 9DL, ENGLAND. USN, RES LAB, CTR ADV SPACE SENSING, WASHINGTON, DC 20375 USA. ACAD SCI USSR, SPACE RES INST, MOSCOW 117810, USSR. NR 40 TC 42 Z9 43 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 1992 VL 257 IS 2 BP 489 EP 500 PG 12 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA HQ506 UT WOS:A1992HQ50600013 ER PT J AU GAUME, RA JOHNSTON, KJ WILSON, TL AF GAUME, RA JOHNSTON, KJ WILSON, TL TI HIGH SPATIAL-RESOLUTION 1.3 CENTIMETER IMAGING OF THE NGC 2024 STAR-FORMING REGION SO ASTROPHYSICAL JOURNAL LA English DT Article DE H-II REGIONS; ISM INDIVIDUAL (NGC 2024); ISM STRUCTURE ID INFRARED LINE; NGC-2024; ABSORPTION; SPECTRUM; EMISSION AB The NGC 2024 star-forming region has been imaged in the (J, K) = (1, 1) and (2, 2) inversion lines of NH3 and the radio continuum at a wavelength of 1.3 cm with a spatial resolution of 3". The continuum image shows one pointlike and two extended features found in previous, lower resolution studies. The unresolved source (in a 2.4 beam) has a 1.3 cm flux density of 19 mJy and coincides with the position of IRS 2. Using the 6 cm data of Snell & Bally, this source has a spectral index (S is-proportional-to nu(alpha)) of alpha = 1.2 +/- 0.2. The radio continuum emission is likely due to an ionized stellar wind. The mass-loss rate is almost-equal-to 3.6 x 10(-7) M. yr-1. The southern extended ionized feature (SCP) coincides with the sharp southern boundary of the H II region: an interface where the H II region is expanding into the northern edge of a group of high density molecular regions. The central part of the extended northern region (NCP) is at the southeast boundary of another group of molecular regions. This central portion of the NCP could be caused by a flow of ionized material off a protrusion of the northern molecular ridge into the extended H II region. The positions of the NH3 maxima generally agree with the positions of the 1.3 mm FIR sources of Mezger et al. For the molecular regions nearest the SCP and NCP, the relative abundances of NH3 are lower, and the FWHP line widths and values of T(k) are larger than the average values (almost-equal-to 10(-9), 1 km s-1 and 30 K, respectively). C1 MAX PLANCK INST RADIOASTRON,W-5300 BONN 1,GERMANY. RP GAUME, RA (reprint author), USN,RES LAB,CTR ADV SPACE SENSIN,CODE 4200,WASHINGTON,DC 20375, USA. NR 25 TC 31 Z9 31 U1 0 U2 0 PU UNIV CHICAGO PRESS PI CHICAGO PA 5720 S WOODLAWN AVE, CHICAGO, IL 60637 SN 0004-637X J9 ASTROPHYS J JI Astrophys. J. PD APR 1 PY 1992 VL 388 IS 2 BP 489 EP 494 DI 10.1086/171168 PN 1 PG 6 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA HM051 UT WOS:A1992HM05100023 ER PT J AU STILL, DL TEMME, LA AF STILL, DL TEMME, LA TI EYEGLASS USE BY UNITED-STATES-NAVY JET PILOTS - EFFECTS ON NIGHT CARRIER LANDING PERFORMANCE SO AVIATION SPACE AND ENVIRONMENTAL MEDICINE LA English DT Article ID FIGHTER PILOTS AB The purpose of this study was to test the hypothesis that the night carrier landing performance of pilots who do not need prescriptive eyeglasses to fly is better than the performance of pilots who do. Night carrier landing scores (NCLS), age, career jet flight hours, and total career flight hours were obtained for 122 U.S. Navy fighter pilots participating in air combat maneuver training at NAS, Oceana, VA. Of the pilots with NCLS, 16 used a prescribed spectacle correction while flying, 106 did not. This study compared the NCLS of the two groups of pilots, those with glasses and those without. We found no significant difference in NCLS between the two groups of pilots-even when the pilots were matched on the basis of age and flight experience. We conclude that pilots who have a refractive error and are required to wear an eyeglass correction while flying perform night carrier landings as well as the pilots who have no refractive error and are permitted to fly with no eye glass correction. RP STILL, DL (reprint author), USN,AEROSP MED RES LAB,NAVAL AIR STN,PENSACOLA,FL 32508, USA. NR 10 TC 5 Z9 5 U1 0 U2 1 PU AEROSPACE MEDICAL ASSOC PI ALEXANDRIA PA 320 S HENRY ST, ALEXANDRIA, VA 22314-3579 SN 0095-6562 J9 AVIAT SPACE ENVIR MD JI Aviat. Space Environ. Med. PD APR PY 1992 VL 63 IS 4 BP 273 EP 275 PG 3 WC Public, Environmental & Occupational Health; Medicine, General & Internal; Sport Sciences SC Public, Environmental & Occupational Health; General & Internal Medicine; Sport Sciences GA HL735 UT WOS:A1992HL73500005 PM 1610336 ER PT J AU VODYANOY, I BEZRUKOV, SM AF VODYANOY, I BEZRUKOV, SM TI SIZING OF AN ION PORE BY ACCESS RESISTANCE MEASUREMENTS SO BIOPHYSICAL JOURNAL LA English DT Article; Proceedings Paper CT CONF ON BIOPHYSICS AND RECOMBINANT DNA : PROBLEMS, STRATEGIES, AND NEW QUESTIONS CY JAN 19-22, 1992 CL AIRLIE, VA SP NIH, NATL SCI FDN, USN, OFF NAVAL RES C1 UNIV MARYLAND,COLLEGE PK,MD 20742. UNIV CALIF IRVINE,DEPT PHYSIOL & BIOPHYS,IRVINE,CA 92717. NIDDK BIOCHEM & METAB LAB,BETHESDA,MD 20892. RP VODYANOY, I (reprint author), OFF NAVAL RES,ARLINGTON,VA 22217, USA. NR 4 TC 38 Z9 40 U1 0 U2 16 PU BIOPHYSICAL SOCIETY PI BETHESDA PA 9650 ROCKVILLE PIKE, BETHESDA, MD 20814-3998 SN 0006-3495 J9 BIOPHYS J JI Biophys. J. PD APR PY 1992 VL 62 IS 1 BP 10 EP 11 DI 10.1016/S0006-3495(92)81762-9 PG 2 WC Biophysics SC Biophysics GA HT995 UT WOS:A1992HT99500005 PM 1376161 ER PT J AU LUDWIG, M HENSEL, NF HARTZMAN, RJ AF LUDWIG, M HENSEL, NF HARTZMAN, RJ TI CALIBRATION OF A RESONANCE ENERGY-TRANSFER IMAGING-SYSTEM SO BIOPHYSICAL JOURNAL LA English DT Article ID NUCLEIC-ACIDS; DEOXYRIBONUCLEIC-ACID; INDIVIDUAL CELLS; ACRIDINE-ORANGE; MAMMALIAN-CELLS; LIVING CELLS; DNA; CHROMATIN; BINDING; DYES AB A quantitative technique for the nondestructive visualization of nanometer scale intermolecular separations in a living system is described. A calibration procedure for the acquisition and analysis of resonance energy transfer (RET) image data is outlined. The factors limiting RET imaging of biological samples are discussed. Measurements required for the calibration include: (a) the spectral sensitivity of the image intensifier (or camera); (b) the transmission spectra of the emission filters; and (c) the quantum distribution functions of the energy transfer pair measured in situ. Resonance energy transfer imaging is demonstrated for two DNA specific dyes. The Forster critical distance for energy transfer between Hoechst 33342 (HO) and acridine orange (AO) is 4.5 +/- 0.7 nm. This distance is slightly greater than the distance of a single turn of the DNA helix (3.5 nm or approximately 10 base pairs), and is well below the optical diffraction limit. Timed sequences of intracellular energy transfer reveal nuclear structure, strikingly similar to that observed with confocal and electron microscopy, and may show the spatial distribution of eu- and hetero- chromatin in the interphase nuclei. C1 GEORGETOWN UNIV,SCH MED,DEPT PEDIAT,WASHINGTON,DC 20007. RP LUDWIG, M (reprint author), USN,MED RES INST,CW BILL YOUNG MARROW DONOR RECRUITMENT & RES PROGRAM,BETHESDA,MD 20889, USA. NR 41 TC 16 Z9 16 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 APR PY 1992 VL 61 IS 4 BP 845 EP 857 PG 13 WC Biophysics SC Biophysics GA HM259 UT WOS:A1992HM25900002 PM 1581499 ER PT J AU HARMS, DE RAMAN, S MADALA, RV AF HARMS, DE RAMAN, S MADALA, RV TI AN EXAMINATION OF 4-DIMENSIONAL DATA-ASSIMILATION TECHNIQUES FOR NUMERICAL WEATHER PREDICTION SO BULLETIN OF THE AMERICAN METEOROLOGICAL SOCIETY LA English DT Article ID NORMAL MODE INITIALIZATION; METEOROLOGICAL DATA ASSIMILATION; STATISTICAL INTERPOLATION; MESOSCALE-MODEL; SCHEME; PRECIPITATION; EQUATIONS; FORECAST; TIME AB Four-dimensional data-assimilation methods, along with the most commonly used objective analysis and initialization techniques, are examined from a historical perspective. Operational techniques, including intermittent data assimilation and Newtonian nudging, and next-generation methods (Kalman-Bucy filtering and the adjoint method) are briefly described. Several methods are compared, with primary emphasis being placed on recent papers dealing with the operational assimilation techniques. Ongoing and future research is outlined, and some important implications of this research are discussed. C1 USN,RES LAB,WASHINGTON,DC 20375. RP HARMS, DE (reprint author), N CAROLINA STATE UNIV,DEPT MARINE EARTH & ATMOSPHER SCI,RALEIGH,NC 27695, USA. NR 91 TC 15 Z9 16 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 APR PY 1992 VL 73 IS 4 BP 425 EP 440 DI 10.1175/1520-0477(1992)073<0425:AEOFDD>2.0.CO;2 PG 16 WC Meteorology & Atmospheric Sciences SC Meteorology & Atmospheric Sciences GA HN329 UT WOS:A1992HN32900001 ER PT J AU GHANDEHARI, M AF GHANDEHARI, M TI STEINHARDT INEQUALITY IN THE MINKOWSKI PLANE SO BULLETIN OF THE AUSTRALIAN MATHEMATICAL SOCIETY LA English DT Article AB In a Minkowski plane with unit circle E, the product of the positive circumference of a plane convex body K and that of its polar dual is greater than or equal to the square of the Euclidean length of the polar dual of E. Equality holds if and only if K is a Euclidean unit circle. C1 USN,POSTGRAD SCH,DEPT MATH,MONTEREY,CA 93943. NR 7 TC 2 Z9 2 U1 0 U2 0 PU AUSTRALIAN MATHEMATICS PUBL ASSOC INC PI CANBERRA PA MATHEMATICS DEPT AUSTRALIAN NATIONAL UNIV, CANBERRA ACT 0200, AUSTRALIA SN 0004-9727 J9 B AUST MATH SOC JI Bull. Aust. Math. Soc. PD APR PY 1992 VL 45 IS 2 BP 261 EP 266 PG 6 WC Mathematics SC Mathematics GA HX892 UT WOS:A1992HX89200009 ER PT J AU GIACCONE, G GAZDAR, AF BECK, H ZUNINO, F CAPRANICO, G AF GIACCONE, G GAZDAR, AF BECK, H ZUNINO, F CAPRANICO, G TI MULTIDRUG SENSITIVITY PHENOTYPE OF HUMAN LUNG-CANCER CELLS ASSOCIATED WITH TOPOISOMERASE-II EXPRESSION SO CANCER RESEARCH LA English DT Article ID DNA CLEAVAGE ACTIVITY; RESISTANT HUMAN-CELLS; LEUKEMIA-CELLS; ANTITUMOR DRUGS; LINES; INHIBITORS; ETOPOSIDE; GENE; CARCINOMA; CHEMOTHERAPY AB Patterns of drug sensitivities in relation to topoisomerase II gene expression and activity were studied in eight human lung cancer cell lines not selected in vitro for drug resistance. The cytotoxicities of doxorubicin, etoposide, teniposide, cisplatin, camptothecin, and 5-fluorouracil were measured and, remarkably, these unselected cell lines were shown to have a common pattern of multidrug sensitivity, ie., a multidrug sensitivity phenotype. In fact, drug sensitivities were significantly correlated with each other in the studied cell lines, the correlation being best for the topoisomerase II-targeted agents and cisplatin, less strong with camptothecin, and weak with 5-fluorouracil. Almost 1-log range difference of topoisomerase II gene expression was found in these cell lines, and this was not explained by the cell-doubling time or cell cycle distribution. The level of topoisomerase II gene expression was positively and highly correlated with the cell sensitivity to epipodophyllotoxins, doxorubicin, and cisplatin in seven cell lines. Although weaker, an association was also observed between topoisomerase II gene expression and camptothecin cytotoxicity, while no association was observed with 5-fluorouracil. However, a non-small cell lung cancer cell line with neuroendocrine properties had very low levels of expression of the topoisomerase II gene, despite being highly sensitive to all drugs tested. The levels of topoisomerase I gene expression were not found to be correlated with the cytotoxicity of any drug tested. A specific enzymatic activity assay and a teniposide-stimulated DNA cleavage assay showed that the extent of active topoisomerase II present in nuclear extracts paralleled the level of topoisomerase II gene expression. Furthermore, in addition to the normal transcript, an abnormally sized topoisomerase II message and a rearrangement of the topoisomerase II gene were detected in a poorly sensitive small cell lung cancer cell line. Therefore, low levels of topoisomerase II gene expression, and possibly mutations, may predict a reduced sensitivity of unselected human lung cancer cell lines to several drugs, including agents with a cellular target other than topoisomerase II. It is hypothesized that topoisomerase II might be involved in a common pathway of cell death induced by drugs in tumor cell lines which present a multidrug sensitivity phenotype. C1 NCI,USN,MED ONCOL BRANCH,BETHESDA,MD 20892. IST NAZL STUDIO & CURA TUMORI,DIV EXPTL ONCOL B,I-20133 MILAN,ITALY. RI Capranico, Giovanni/K-1678-2014; Giaccone, Giuseppe/E-8297-2017 OI Capranico, Giovanni/0000-0002-8708-6454; Giaccone, Giuseppe/0000-0002-5023-7562 NR 43 TC 146 Z9 146 U1 0 U2 0 PU AMER ASSOC CANCER RESEARCH PI PHILADELPHIA PA PUBLIC LEDGER BLDG, SUITE 816, 150 S. INDEPENDENCE MALL W., PHILADELPHIA, PA 19106 SN 0008-5472 J9 CANCER RES JI Cancer Res. PD APR 1 PY 1992 VL 52 IS 7 BP 1666 EP 1674 PG 9 WC Oncology SC Oncology GA HL505 UT WOS:A1992HL50500003 PM 1312895 ER PT J AU DAMICO, D CARBONE, DP JOHNSON, BE MELTZER, SJ MINNA, JD AF DAMICO, D CARBONE, DP JOHNSON, BE MELTZER, SJ MINNA, JD TI POLYMORPHIC SITES WITHIN THE MCC AND APC LOCI REVEAL VERY FREQUENT LOSS OF HETEROZYGOSITY IN HUMAN SMALL-CELL LUNG-CANCER SO CANCER RESEARCH LA English DT Note ID ABNORMALITIES; GENE; LINES AB Using single-strand conformation polymorphism we have found two polymorphic sites, AAC to AAT at codon 511 (exon 12) and GCT to GCG at codon 708 (exon 15), in the MCC gene. These sites and an RsaI polymorphic site in APC allowed us to study 23 human small cell lung cancer (SCLC) and 7 non-small cell lung cancer samples for allele loss. Of the 23 SCLC samples, 21 (91%) were informative for one or more of these markers, and we found allele loss in more than 80% (17 of 21). In non-small cell lung cancer samples, 5 of 7 (71%) were informative, and reduction or loss of one allele was found in 2 of 5 (40%). Seven cases were informative for both genes, loss of heterozygosity occurred for both genes in five, one retained heterozygosity for both, and one SCLC had loss of heterozygosity for APC but not for MCC. We conclude that loss of heterozygosity occurs frequently for MCC and APC in lung cancer of all histological types and is very frequent in SCLC. This suggests the presence of tumor suppressor gene(s) in the MCC/APC region of 5q21 involved in human lung cancer. C1 NCI,USN,MED ONCOL BRANCH,BETHESDA,MD 20889. UNIV MARYLAND,DEPT MED,DIV GASTROINTESTINAL,BALTIMORE,MD 21201. LOCH RAVEN VET AFFAIRS HOSP,BALTIMORE,MD 21201. RP DAMICO, D (reprint author), UNIV TEXAS,SW MED CTR,SIMMONS CANC CTR,5323 HARRY HINES BLVD,DALLAS,TX 75235, USA. NR 26 TC 114 Z9 114 U1 0 U2 0 PU AMER ASSOC CANCER RESEARCH PI PHILADELPHIA PA PUBLIC LEDGER BLDG, SUITE 816, 150 S. INDEPENDENCE MALL W., PHILADELPHIA, PA 19106 SN 0008-5472 J9 CANCER RES JI Cancer Res. PD APR 1 PY 1992 VL 52 IS 7 BP 1996 EP 1999 PG 4 WC Oncology SC Oncology GA HL505 UT WOS:A1992HL50500058 PM 1348017 ER PT J AU Bernhardt, PA AF Bernhardt, Paul A. TI Coupling of the relaxation and resonant elements in the autonomous chaotic relaxation oscillator (ACRO) SO CHAOS LA English DT Article AB If a harmonic oscillator is embedded in a relaxation oscillator, the resulting system may behave like an autonomous chaotic relaxation oscillator (ACRO). The discharge transient of the relaxation oscillator excites sinusoidal oscillations in the harmonic oscillator and these sinusoids affect when the next discharge occurs. This can lead to chaotic intervals in the oscillator periods. A simple electronic model of the ACRO is studied over a wide range of parameters using numerical, analytic, and experimental techniques. The dynamics of the ACRO is found to be determined by three parameters: (1) tuning, (2) coupling, and (3) damping. Complex, intermittent outputs can always be inhibited by increasing the damping of the harmonic oscillator. For weak damping, strong coupling yields chaotic periods. With weak damping and weak coupling, complex behavior only occurs if the relaxation oscillator is tuned near a resonance of the harmonic oscillator. A new path to chaos, called a disruption bifurcation, is the source for intermittency in the ACRO. This bifurcation occurs when the amplitude of internal resonances is excited to the degree that existing limit cycles are disrupted. C1 USN, Space Plasma Branch, Div Plasma Phys, Res Lab, Washington, DC 20375 USA. RP Bernhardt, PA (reprint author), USN, Space Plasma Branch, Div Plasma Phys, Res Lab, Washington, DC 20375 USA. FU Office of Naval Research FX The author is grateful to I. B. Schwartz for discussions on the problem of coupled oscillators and to H. E. Nusse and J. A. Yorke for pointing out the similarity of border-collision bifurcations to disruption bifurcations. This research used resources from the Special Project for Nonlinear Science at the Naval Research Laboratory. Support was provided by the Office of Naval Research. NR 15 TC 2 Z9 2 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 1054-1500 J9 CHAOS JI Chaos PD APR PY 1992 VL 2 IS 2 PG 17 WC Mathematics, Applied; Physics, Mathematical SC Mathematics; Physics GA V22XO UT WOS:000208308100003 ER PT J AU VOLAREVIC, S NIKLINSKA, BB BURNS, CM YAMADA, H JUNE, CH DUMONT, FJ ASHWELL, JD AF VOLAREVIC, S NIKLINSKA, BB BURNS, CM YAMADA, H JUNE, CH DUMONT, FJ ASHWELL, JD TI THE CD45 TYROSINE PHOSPHATASE REGULATES T-CELL PHOSPHOTYROSINE HOMEOSTASIS AND ACTIVATION-INDUCED CALCIUM OSCILLATIONS SO CLINICAL RESEARCH LA English DT Meeting Abstract C1 NIH,BIOL RESPONSE MODIFIERS PROGRAM,BETHESDA,MD 20892. USN,MED RES INST,IMMUNE CELL BIOL PROGRAM,BETHESDA,MD 20814. MERCK SHARP & DOHME LTD,DEPT IMMUNOL RES,RAHWAY,NJ 07065. NR 0 TC 0 Z9 0 U1 0 U2 0 PU SLACK INC PI THOROFARE PA 6900 GROVE RD, THOROFARE, NJ 08086 USA SN 0009-9279 J9 CLIN RES JI Clin. Res. PD APR PY 1992 VL 40 IS 2 BP A322 EP A322 PG 1 WC Medicine, Research & Experimental SC Research & Experimental Medicine GA HN741 UT WOS:A1992HN74101064 ER PT J AU WHITT, DM AF WHITT, DM TI REFORM AS WELL AS RETRENCHMENT - DEFENSE MANAGEMENT AND THE NEW-WORLD ORDER SO COMPARATIVE STRATEGY LA English DT Article DE DEFENSE MANAGEMENT; FOREIGN POLICY; INTERNATIONAL POLITICS; NATIONAL SECURITY AB Radical alteration of the international security environment has prompted a response by the Unite States in terms of revision in American strategy as well as plans for restructuring military forces. Similarly relevant is the question of whether changes in the threat, policy, strategy, forces, and budget require equally dramatic (meaning truly fundamental) revision in the conduct of decision-making for defense. The old and new world orders are contrasted, followed by a description of the official options for future force configuration, prior to an evaluation of the necessity for change in the overall approach to defense management. RP WHITT, DM (reprint author), USN,POSTGRAD SCH,INST DEF RESOURCES MANAGEMENT,MONTEREY,CA 93943, USA. NR 31 TC 0 Z9 0 U1 1 U2 1 PU TAYLOR & FRANCIS PI BRISTOL PA 1900 FROST ROAD, SUITE 101, BRISTOL, PA 19007-1598 SN 0149-5933 J9 COMP STRATEGY PD APR-JUN PY 1992 VL 11 IS 2 BP 115 EP 147 DI 10.1080/01495939208402867 PG 33 WC International Relations; Political Science SC International Relations; Government & Law GA JC653 UT WOS:A1992JC65300001 ER PT J AU HAMMING, RW AF HAMMING, RW TI JANUARY BOOK REVIEW - A PLEA FOR MCMATHEMATICS FOR ENGINEERS - REPLY SO COMPUTER LA English DT Letter RP HAMMING, RW (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 APR PY 1992 VL 25 IS 4 BP 4 EP 4 PG 1 WC Computer Science, Hardware & Architecture; Computer Science, Software Engineering SC Computer Science GA HM021 UT WOS:A1992HM02100002 ER PT J AU MCINTYRE, JF DOW, TS AF MCINTYRE, JF DOW, TS TI INTERGRANULAR CORROSION BEHAVIOR OF ALUMINUM-ALLOYS EXPOSED TO ARTIFICIAL SEAWATER IN THE PRESENCE OF NITRATE ANION SO CORROSION LA English DT Article DE CONNECTIVITY; EXFOLIATION; GRAIN BOUNDARY; INTERGRANULAR; INTERMETALLICS ID CHLORIDE; CRACKING AB The corrosion behavior of several high-strength aluminum alloys was characterized. The alloys were exposed to solutions of artificial seawater, some of which contained nitrate ion. Alloys were tested in the seawater solutions at room temperature and elevated temperature conditions. A unique synergism was discovered when nitrate anion was present in seawater, the synergism between nitrate anions and sea water greatly accelerated the intergranular corrosion of AA7075 alloys. This environment was relatively benign toward the alloys AA6061, PM7XXX, IN9052, and IN905XL. A mechanism to account for the observed synergism, which was recreated by mixing nitrate salts with artificial seawater, is proposed herein. The importance of grain boundary microstructure and chemical composition is discussed with respect to intermetallic reactivity and connectivity. C1 USN,CTR SURFACE WARFARE,ELECTROCHEM BRANCH,SILVER SPRING,MD 20903. RP MCINTYRE, JF (reprint author), FLORIDA ATLANTIC UNIV,DEPT OCEAN ENGN,POB 3091,BOCA RATON,FL 33431, USA. NR 23 TC 12 Z9 12 U1 0 U2 6 PU NATL ASSN CORROSION ENG PI HOUSTON PA 1440 SOUTH CREEK DRIVE, HOUSTON, TX 77084-4906 SN 0010-9312 J9 CORROSION JI Corrosion PD APR PY 1992 VL 48 IS 4 BP 309 EP 319 PG 11 WC Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Materials Science; Metallurgy & Metallurgical Engineering GA JD156 UT WOS:A1992JD15600006 ER PT J AU JUNE, CH AF JUNE, CH TI ANALYSIS OF LYMPHOCYTE-ACTIVATION AND METABOLISM BY FLOW-CYTOMETRY SO CURRENT OPINION IN IMMUNOLOGY LA English DT Review ID HUMAN-IMMUNODEFICIENCY-VIRUS; FLUORESCENCE ENERGY-TRANSFER; CELL ANTIGEN RECEPTOR; ASSOCIATION; CALCIUM; TRANSCRIPTION; FLUO-3; NA+; PH AB The use of flow cytometry for the study of lymphocyte activation and cellular metabolism continues to expand. This has permitted rapid progress in the understanding of the regulation of multiple intracellular ions, metabolic pathways, and the control of gene expression. Knowledge of these basic mechanisms of cellular homeostasis is now being applied to the flow cytometric study of immune dysregulation. Various flow cytometric techniques for measuring apoptosis are summarized. C1 UNIFORMED SERV UNIV HLTH SCI,BETHESDA,MD 20814. RP JUNE, CH (reprint author), USN,MED RES INST,IMMUNE CELL BIOL PROGRAM,MAIL STOP 44,BETHESDA,MD 20889, USA. NR 53 TC 1 Z9 1 U1 0 U2 0 PU CURRENT BIOLOGY LTD PI LONDON PA 34-42 CLEVELAND STREET, LONDON, ENGLAND W1P 6LB SN 0952-7915 J9 CURR OPIN IMMUNOL JI Curr. Opin. Immunol. PD APR PY 1992 VL 4 IS 2 BP 200 EP 204 DI 10.1016/0952-7915(92)90014-6 PG 5 WC Immunology SC Immunology GA HZ104 UT WOS:A1992HZ10400014 PM 1605909 ER PT J AU ROSS, EV BAXTER, DL AF ROSS, EV BAXTER, DL TI WIDESPREAD CANDIDA-FOLLICULITIS IN A NONTOXIC PATIENT SO CUTIS LA English DT Article ID CORNEOCYTES; ADHERENCE; ALBICANS AB We present a case of widespread Candida folliculitis in a nontoxic, immunocompetent woman. Predisposing factors included obesity and use of systemic antibiotics and topical steroids. Diagnosis was made through potassium hydroxide and Gram's stain examination of the pustular contents. The patient was treated with oral ketoconazole and topical econazole, with resolution of the eruption in six weeks. We suggest that temperature played a role in the follicular location of the lesions. C1 USN,CTR MED,DEPT DERMATOL,BETHESDA,MD 20814. NR 10 TC 9 Z9 9 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 APR PY 1992 VL 49 IS 4 BP 241 EP 243 PG 3 WC Dermatology SC Dermatology GA HV814 UT WOS:A1992HV81400004 PM 1521475 ER PT J AU BAXTER, DL KALLGREN, DL LEONE, KC AF BAXTER, DL KALLGREN, DL LEONE, KC TI ACROKERATOSIS PARANEOPLASTICA OF BAZEX - REPORT OF A CASE IN A YOUNG BLACK WOMAN SO CUTIS LA English DT Article ID PARA-NEOPLASTIC ACROKERATOSIS; CARCINOMA; ADENOCARCINOMA AB Acrokeratosis paraneoplastica of Bazex is a rare cutaneous syndrome associated with malignant neoplasms of the pulmonary and upper gastrointestinal tract, or cervical metastatic adenopathy, usually seen in middle-aged white men. We present a unique case of Bazex syndrome in that the patient was young, black, and a woman. C1 USN,CTR MED,DEPT DERMATOL,BETHESDA,MD 20814. NR 20 TC 10 Z9 10 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 APR PY 1992 VL 49 IS 4 BP 265 EP 268 PG 4 WC Dermatology SC Dermatology GA HV814 UT WOS:A1992HV81400008 PM 1521479 ER PT J AU COLLEN, MJ JOHNSON, DA AF COLLEN, MJ JOHNSON, DA TI CORRELATION BETWEEN BASAL ACID OUTPUT AND DAILY RANITIDINE DOSE REQUIRED FOR THERAPY IN BARRETTS-ESOPHAGUS SO DIGESTIVE DISEASES AND SCIENCES LA English DT Article DE ACID SECRETION; RANITIDINE; BARRETTS ESOPHAGUS ID ZOLLINGER-ELLISON SYNDROME; GASTROESOPHAGEAL REFLUX DISEASE; CIMETIDINE; OMEPRAZOLE; HYPERSECRETION; SECRETION; ULCERS AB We prospectively evaluated basal gastric acid secretion in 42 consecutive patients with Barrett's esophagus to determine the optimal dose requirement for an H-2-receptor antagonist in relation to the gastric acid secretory status of each patient. All patients with Barrett's esophagus had pyrosis and 31 of the 42 patients had erosive esophagitis. Mean extension of Barrett's epithelium was 6.9 cm (range 2-17 cm). Mean basal acid output for the patients with Barrett's esophagus was 8.0 +/- 5.2 meq/hr, which was significantly different compared to a group of 65 normal subjects with mean basal acid output of 3.0 +/- 2.7 meq/hr (P < 0.001). There was no correlation between basal acid output and extension of Barrett's epithelium. All patients with Barrett's esophagus were treated with ranitidine, with 24 requiring standard-dose (300 mg/day) and 18 requiring increased doses (mean 1170 mg/day, range 600-2400 mg/day) for complete healing of esophagitis and disappearance of pyrosis. There was a significant correlation between basal acid output and daily ranitidine dose required for therapy (r = 0.52, P < 0.001). Fifteen of the 42 patients with Barrett's esophagus (36%) had gastric acid hypersecretion. There was a significant association between gastric acid hypersecretion defined as a basal acid output of greater than 10.0 meq/hr and a requirement for increased daily ranitidine doses (greater than 300 mg/day) (P < 0.0002). No side effects occurred with any of these high doses of ranitidine. We conclude that as a group, patients with Barrett's esophagus have significantly higher basal acid outputs than normal subjects and many require increased therapeutic doses of ranitidine. Furthermore, there is a significant correlation between basal acid output and therapeutic daily ranitidine dose and a significant association between gastric acid hypersecretion and the requirement for increased daily ranitidine doses. C1 LOMA LINDA UNIV, MED CTR, DEPT MED, DIV GASTROENTEROL, LOMA LINDA, CA 92350 USA. USN HOSP, DEPT MED, DIV GASTROENTEROL, BETHESDA, MD 20814 USA. NR 36 TC 30 Z9 30 U1 0 U2 0 PU SPRINGER PI DORDRECHT PA VAN GODEWIJCKSTRAAT 30, 3311 GZ DORDRECHT, NETHERLANDS SN 0163-2116 EI 1573-2568 J9 DIGEST DIS SCI JI Dig. Dis. Sci. PD APR PY 1992 VL 37 IS 4 BP 570 EP 576 DI 10.1007/BF01307581 PG 7 WC Gastroenterology & Hepatology SC Gastroenterology & Hepatology GA HL971 UT WOS:A1992HL97100016 PM 1551347 ER PT J AU UNGER, T NAU, MM SEGAL, S MINNA, JD AF UNGER, T NAU, MM SEGAL, S MINNA, JD TI P53 - A TRANSDOMINANT REGULATOR OF TRANSCRIPTION WHOSE FUNCTION IS ABLATED BY MUTATIONS OCCURRING IN HUMAN CANCER SO EMBO JOURNAL LA English DT Article DE ACTIVATION DOMAIN; LUNG CANCER; P53; TEMPERATURE SENSITIVITY; TRANSACTIVATION ACTIVITY ID CELL LUNG-CANCER; MAMMALIAN-CELLS; WILD-TYPE; GENE; PROTEIN; MUTANT; DNA; TRANSFORMATION; EXPRESSION; ACTIVATION AB Gal4-p53 fusion constructs demonstrate that wild type p53 is a potent transactivator in human lung cancer cells with the transactivation domain for p53 residing in amino acids 1-42. Strikingly, a variety of lung cancer derived p53 mutations occurring outside this domain disrupt this activity. Temperature sensitive conformational shifts of p53 mutant proteins to the wild type form exist and, with a temperature downshift, several mutants become transcriptionally active. Wild type p53 protein is known to form oligomers with mutant p53 and cotransfection of wild type and mutant genes shows that p53 acts in a transdominant manner that is independent of the DNA binding specificity. Transcription is either increased or decreased depending on whether the wild type is more or less abundant than the mutant form. Finally, lung cancers differ in their ability to support the transactivation related functions, providing evidence of other abnormalities of the p53 system in human cancer. C1 UNIFORMED SERV UNIV HLTH SCI,USN,NCI,MED ONCOL BRANCH,BETHESDA,MD 20889. UNIV TEXAS,SW MED CTR,SIMMONS CANC CTR,DALLAS,TX 75235. NR 41 TC 295 Z9 297 U1 0 U2 3 PU OXFORD UNIV PRESS UNITED KINGDOM PI OXFORD PA WALTON ST JOURNALS DEPT, OXFORD, ENGLAND OX2 6DP SN 0261-4189 J9 EMBO J JI Embo J. PD APR PY 1992 VL 11 IS 4 BP 1383 EP 1390 PG 8 WC Biochemistry & Molecular Biology; Cell Biology SC Biochemistry & Molecular Biology; Cell Biology GA HM836 UT WOS:A1992HM83600017 PM 1314165 ER PT J AU WU, C AF WU, C TI OPTIMAL POWER FROM A RADIATING SOLAR-POWERED THERMIONIC ENGINE SO ENERGY CONVERSION AND MANAGEMENT LA English DT Article DE SOLAR POWER; THERMIONIC ENGINE; OPTIMIZATION AB A finite-time thermodynamic analysis is given of the thermionic engine as a direct converter of heat to electricity. The engine is coupled to a radiant solar input and is radiatively coupled to a heat sink. Both the heat source and heat sink are assumed to have infinite heat-capacity rates. The characteristics of the engine are determined when it is operating at maximum power. RP WU, C (reprint author), USN ACAD,ANNAPOLIS,MD 21402, USA. NR 0 TC 16 Z9 20 U1 0 U2 5 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0196-8904 J9 ENERG CONVERS MANAGE JI Energy Conv. Manag. PD APR PY 1992 VL 33 IS 4 BP 279 EP 282 DI 10.1016/0196-8904(92)90119-H PG 4 WC Thermodynamics; Energy & Fuels; Mechanics SC Thermodynamics; Energy & Fuels; Mechanics GA HV137 UT WOS:A1992HV13700008 ER PT J AU MEYERSON, MD AF MEYERSON, MD TI CONFORMAL MAPPING AND FRACTURE-MECHANICS SO ENGINEERING FRACTURE MECHANICS LA English DT Note AB A mathematical model is applied to the problem of using a drop in electric potential to measure the size of a crack in a metal specimen. The approach is through conformal mapping and the Schwarz-Christoffel formula. The integrals and computations of maps involved are done with a computer package called SCPACK. RP MEYERSON, MD (reprint author), USN ACAD,DEPT MATH,ANNAPOLIS,MD 21402, USA. NR 5 TC 1 Z9 1 U1 1 U2 2 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0013-7944 J9 ENG FRACT MECH JI Eng. Fract. Mech. PD APR PY 1992 VL 41 IS 6 BP 951 EP 953 DI 10.1016/0013-7944(92)90243-8 PG 3 WC Mechanics SC Mechanics GA HR722 UT WOS:A1992HR72200012 ER PT J AU BLAISURE, KR ARNOLDMANN, J AF BLAISURE, KR ARNOLDMANN, J TI RETURN AND REUNION - A PSYCHOEDUCATIONAL PROGRAM ABOARD UNITED-STATES-NAVY SHIPS SO FAMILY RELATIONS LA English DT Article DE DEPLOYMENT; DESERT STORM; FAMILY STRESS THEORY; MILITARY FAMILIES; REUNION ID FAMILY STRESS; MILITARY AB Since 1980 Navy Family Services Centers have provided a variety of deployment programs to Naval personnel and their families to prepare for separation and reunion. This article highlights the Return and Reunion program given aboard U. S. Navy ships returning from deployments. The goal of the program is to increase the resources of Navy personnel to respond effectively to the normative and stressful event of reunion. Evaluation measures of the program are reviewed. C1 USN,CTR FAMILY SERV,VIRGINIA BEACH,VA 23460. RP BLAISURE, KR (reprint author), VIRGINIA POLYTECH INST & STATE UNIV,DEPT FAMILY & CHILD DEV,BLACKSBURG,VA 24061, USA. NR 27 TC 4 Z9 4 U1 0 U2 0 PU NATL COUNCIL FAMILY RELATIONS PI MINNEAPOLIS PA 3989 CENTRAL AVE NE #550, MINNEAPOLIS, MN 55421 SN 0197-6664 J9 FAM RELAT JI Fam. Relat. PD APR PY 1992 VL 41 IS 2 BP 178 EP 185 PG 8 WC Family Studies; Social Work SC Family Studies; Social Work GA HR356 UT WOS:A1992HR35600008 ER PT J AU HEDGES, JI HATCHER, PG ERTEL, JR MEYERSSCHULTE, KJ AF HEDGES, JI HATCHER, PG ERTEL, JR MEYERSSCHULTE, KJ TI A COMPARISON OF DISSOLVED HUMIC SUBSTANCES FROM SEAWATER WITH AMAZON RIVER COUNTERPARTS BY C-13-NMR SPECTROMETRY SO GEOCHIMICA ET COSMOCHIMICA ACTA LA English DT Letter ID NUCLEAR MAGNETIC-RESONANCE; ORGANIC-MATTER; PACIFIC-OCEAN; CARBON; NITROGEN; RADIOCARBON; PHOSPHORUS; WATER; SEA AB Although dissolved organic matter (DOM) in seawater constitutes one of the major reservoirs of reduced carbon on earth, the biochemical and geographic origins of this material and its hydrophobic humic component remain unclear. Rivers have been suggested as a potentially important source of marine DOM, but this implication has not yet been systematically tested by direct comparisons of the bulk structural characteristics of DOM isolated from representative ocean reservoirs and their major river sources. We report here such a comparison and find that dissolved humic substances isolated from surface and deep seawater in the East Equatorial and north Central Pacific are enriched in nitrogen and C-13 and depleted in unsaturated carbon with respect to counterparts from the Amazon River system. Based on these observations, riverine dissolved humic substances appear to comprise a small fraction of seawater humic substances and therefore must be efficiently and rapidly removed from the ocean. C1 PENN STATE UNIV,FUEL SCI PROGRAM,UNIV PK,PA 16802. UNIV GEORGIA,DEPT GEOL,ATHENS,GA 30602. USN,OCEAN RES GRP,SAN DIEGO,CA 92152. RP HEDGES, JI (reprint author), UNIV WASHINGTON,SCH OCEANOG,WB-10,SEATTLE,WA 98195, USA. NR 28 TC 102 Z9 108 U1 0 U2 28 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0016-7037 J9 GEOCHIM COSMOCHIM AC JI Geochim. Cosmochim. Acta PD APR PY 1992 VL 56 IS 4 BP 1753 EP 1757 DI 10.1016/0016-7037(92)90241-A PG 5 WC Geochemistry & Geophysics SC Geochemistry & Geophysics GA HQ100 UT WOS:A1992HQ10000028 ER PT J AU HOWARD, BE SYCK, JM AF HOWARD, BE SYCK, JM TI CALCULATION OF THE SHAPE OF A TOWED UNDERWATER ACOUSTIC ARRAY SO IEEE JOURNAL OF OCEANIC ENGINEERING LA English DT Article DE ACOUSTIC TOWED ARRAY; HYDROPHONE; TWISTED QUARTIC SPLINE; NUMERICAL INTERPOLATION; NUMERICAL APPROXIMATION; 2-POINT BOUNDARY CONDITIONS AB An important area of towed underwater acoustic research is the determination of the three-dimensional positions of all hydrophones in the array. Although there are a number of methods available that provide position information at a small number of locations along the array, an interpolation scheme is needed that will permit the estimation of the position of all hydrophones so that further processing of acoustic data may proceed. In this paper, an interpolation technique based on a twisted quartic spline approximation to a space curve is developed. This technique provides the advantages of numerical stability, necessary smoothness, and satisfaction of physical boundary conditions. Most importantly, it permits the estimation of the positions of all hydrophones in the array. C1 USN,CTR UNDERWATER SYST,NEW LONDON,CT 06320. DARTMOUTH COLL,HANOVER,NH 03755. RP HOWARD, BE (reprint author), UNIV MIAMI,DEPT MATH & COMP SCI,CORAL GABLES,FL 33124, USA. NR 6 TC 18 Z9 19 U1 0 U2 1 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0364-9059 J9 IEEE J OCEANIC ENG JI IEEE J. Ocean. Eng. PD APR PY 1992 VL 17 IS 2 BP 193 EP 203 DI 10.1109/48.126976 PG 11 WC Engineering, Civil; Engineering, Ocean; Engineering, Electrical & Electronic; Oceanography SC Engineering; Oceanography GA HK606 UT WOS:A1992HK60600002 ER PT J AU STONEMAN, RC LYNN, JG ESTEROWITZ, L AF STONEMAN, RC LYNN, JG ESTEROWITZ, L TI DIRECT UPPER-STATE PUMPING OF THE 2.8 MU-M ER-3+-YLF LASER SO IEEE JOURNAL OF QUANTUM ELECTRONICS LA English DT Article ID ROOM-TEMPERATURE; DIODE; EMISSION AB Direct resonant pumping of the 4I11/2 upper state of the 2.8-mu-m Er3+:YLF laser at 0.97-mu-m is shown to be more efficient than other pumping schemes which have been used for this transition. Upper-state pumping avoids nonradiative losses arising from phonon and self-quenching decays inherent in other pumping schemes. Efficient performance of the 2.8-mu-m laser is maintained on condition that extremely shallow pump absorption is avoided. Reduced efficiency for shallow pump absorption is attributed to upconversion loss arising from high pumping rates. RP STONEMAN, RC (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 17 TC 39 Z9 40 U1 1 U2 4 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0018-9197 J9 IEEE J QUANTUM ELECT JI IEEE J. Quantum Electron. PD APR PY 1992 VL 28 IS 4 BP 1041 EP 1045 DI 10.1109/3.135226 PG 5 WC Engineering, Electrical & Electronic; Optics; Physics, Applied SC Engineering; Optics; Physics GA HP653 UT WOS:A1992HP65300038 ER PT J AU HOWERTON, PH CORDRAY, DM AF HOWERTON, PH CORDRAY, DM TI DIODE-PUMPED AMPLIFIER/LASER USING LEAKY WAVE FIBER COUPLING - AN EVALUATION SO IEEE JOURNAL OF QUANTUM ELECTRONICS LA English DT Article ID ND-YAG LASER; YTTRIUM ALUMINUM GARNET; NEODYMIUM; ARRAY AB Experimental measurements on a diode-pumped solid-state amplifier/laser using leaky wave fiber coupling are presented. Test results indicate that a diode laser to solid-state rod coupling efficiency of 81% and an overall pump energy coupling efficiency of 26.5% into a single TEM00 are possible. A single-pass gain coefficient of 1.7 x 10(-3) cm-1 was obtained in a 2 mm diameter by 25 mm long Nd: YAG laser rod while being pumped with 418 m W through a multimode optical fiber. Good agreement between the measured and calculated gain coefficient was observed. C1 USN,RES LAB,APPL OPT BRANCH,WASHINGTON,DC 20375. RP HOWERTON, PH (reprint author), SFA INC,LANDOVER,MD 20785, USA. NR 22 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 APR PY 1992 VL 28 IS 4 BP 1081 EP 1087 DI 10.1109/3.135231 PG 7 WC Engineering, Electrical & Electronic; Optics; Physics, Applied SC Engineering; Optics; Physics GA HP653 UT WOS:A1992HP65300043 ER PT J AU MA, Z WHITE, MH WILLIAMS, KJ ESMAN, RD UZUNOGLU, V AF MA, Z WHITE, MH WILLIAMS, KJ ESMAN, RD UZUNOGLU, V TI A HIGH-PERFORMANCE OPTICALLY INJECTED SYNCHRONOUS OSCILLATOR SO IEEE PHOTONICS TECHNOLOGY LETTERS LA English DT Article ID SYNCHRONIZATION; TRACKING; LOCKING AB An improved optical injection network, which incorporates a high speed p-i-n photodiode into a microwave synchronous oscillator (SO), is presented in this letter. The p-i-n photodiode directly injects current converted from a modulated optical signal into the SO tank circuit. The SO possesses an adaptive gain function to amplify a low level input signal to +7 dBm, and tracks the frequency deviation of the input signal to achieve synchronization. A tracking bandwidth up to 8 MHz has been observed, which is a factor of 10 better than previous results with the same optical injection power. Within the tracking bandwidth, the FM noise is significantly reduced and frequency/phase jitter is substantially eliminated. This technique is applicable to fiber-optic communication systems for the applications of clock/carrier recovery and coherent demodulation. C1 SYNCHTRACK CORP,GAITHERSBURG,MD 20877. USN,RES LAB,WASHINGTON,DC 20375. RP MA, Z (reprint author), LEHIGH UNIV,SHERMAN FAIRCHILD CTR SOLID STATE STUDIES,BETHLEHEM,PA 18015, USA. NR 11 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 APR PY 1992 VL 4 IS 4 BP 405 EP 408 DI 10.1109/68.127229 PG 4 WC Engineering, Electrical & Electronic; Optics; Physics, Applied SC Engineering; Optics; Physics GA HL339 UT WOS:A1992HL33900039 ER PT J AU MORGAN, MA WELCH, TB AF MORGAN, MA WELCH, TB TI FIELD FEEDBACK COMPUTATION OF SCATTERING BY 2-D PENETRABLE OBJECTS SO IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION LA English DT Note ID ELECTROMAGNETIC SCATTERING; FORMULATION AB The field feedback formulation is applied to the solution of time-harmonic plane wave scattering by 2-D penetrable objects of arbitrary shape and composition. A conformal mesh, finite. element algorithm is employed in the forward operator construction while a near-field Green's function integration is used, in forming the feedback operator. Scattering validations for midresonance sized objects include a circular cylinder, a two-region bisected cylinder, a half-circular cylinder, a semicircular shell and a thin lossy planar strip. RP MORGAN, MA (reprint author), NAVAL POST GRAD SCH,DEPT ELECT & COMP ENGN,MONTEREY,CA 93943, USA. NR 22 TC 5 Z9 5 U1 0 U2 0 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0018-926X J9 IEEE T ANTENN PROPAG JI IEEE Trans. Antennas Propag. PD APR PY 1992 VL 40 IS 4 BP 445 EP 450 DI 10.1109/8.138848 PG 6 WC Engineering, Electrical & Electronic; Telecommunications SC Engineering; Telecommunications GA HW461 UT WOS:A1992HW46100013 ER PT J AU ROBERTSON, RC HA, TT AF ROBERTSON, RC HA, TT TI A MODEL FOR LOCAL MOBILE RADIO-COMMUNICATIONS WITH CORRECT PACKET CAPTURE SO IEEE TRANSACTIONS ON COMMUNICATIONS LA English DT Article ID RAYLEIGH-FADING CHANNELS; SLOTTED ALOHA; RANDOM-ACCESS; PERFORMANCE; NETWORKS; THROUGHPUT; CAPACITY; CODES; SLOW AB An analysis of the performance of a local/mobile radio communications system utilizing the slotted ALOHA multiple random access protocol is presented in this paper. The probability of correct packet capture is evaluated for a local/mobile packet radio system using ideal coherent binary phase-shift keying (BPSK) modulation. Both the near/far effect and the effect of Rayleigh fading on the probability of correct packet capture are taken into account, but the effect of thermal noise is neglected since the interference due to competing packets is dominant in practical systems. The probability of correct packet reception is evaluated for a system using spatial diversity. In addition, the effect on system performance of either convolutional coding with hard decision Viterbi decoding or binary linear block coding with hard decision decoding is evaluated. The pseudo-Bayesian algorithm that has been developed to stabilize a packet system based on the slotted ALOHA protocol at maximum channel throughput is found to be adaptable to the local/mobile operating environment. For the slotted ALOHA system considered in this paper, it is possible to obtain channel throughputs as high as 0.66 provided a spatial diversity of around ten can be implemented. RP ROBERTSON, RC (reprint author), NAVAL POST GRAD SCH,DEPT ELECT & COMP ENGN,MONTEREY,CA 93943, USA. NR 27 TC 6 Z9 6 U1 0 U2 0 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0090-6778 J9 IEEE T COMMUN JI IEEE Trans. Commun. PD APR PY 1992 VL 40 IS 4 BP 847 EP 854 DI 10.1109/26.141439 PG 8 WC Engineering, Electrical & Electronic; Telecommunications SC Engineering; Telecommunications GA HX032 UT WOS:A1992HX03200024 ER PT J AU SHANFIELD, Z BROWN, GA REVESZ, AG HUGHES, HL AF SHANFIELD, Z BROWN, GA REVESZ, AG HUGHES, HL TI A NEW MOS RADIATION-INDUCED CHARGE - NEGATIVE FIXED INTERFACE CHARGE SO IEEE TRANSACTIONS ON NUCLEAR SCIENCE LA English DT Article ID GATE AB The irradiation behavior [up to approximately 1.3 Mrad(SiO2)] of MOS capacitors (50 nm thick dry grown SiO2, Al, or poly-Si gate) with or without postoxidation anneal (POA) in Ar at 1000-degrees-C has been studied by conventional capacitance-voltage (CV) analysis and thermally stimulated current techniques. The most important finding is that all of the samples processed for radiation hardness, i.e., without POA, exhibited a charge compensation effect. The radiation-induced positive oxide charge is partially compensated by a negative fixed interface charge which lies either outside the energy range accessible by CV and similar techniques or extends spatially away from the interface into the oxide without acquiring the characteristics of a "bulk" oxide charge. The existence of this fixed charge may jeopardize long-term device reliability as an interface charge is more prone to change than an oxide charge. C1 NORTHROP CORP,PALOS VERDES,CA 90274. TEXAS INSTRUMENTS INC,DALLAS,TX 75243. REVESZ ASSOCIATES,BETHESDA,MD 20817. USN,RES LAB,WASHINGTON,DC 20375. NR 12 TC 24 Z9 24 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 0018-9499 J9 IEEE T NUCL SCI JI IEEE Trans. Nucl. Sci. PD APR PY 1992 VL 39 IS 2 BP 303 EP 307 DI 10.1109/23.277501 PN 2 PG 5 WC Engineering, Electrical & Electronic; Nuclear Science & Technology SC Engineering; Nuclear Science & Technology GA HN888 UT WOS:A1992HN88800007 ER PT J AU PATI, YC KRISHNAPRASAD, PS PECKERAR, MC AF PATI, YC KRISHNAPRASAD, PS PECKERAR, MC TI AN ANALOG NEURAL NETWORK SOLUTION TO THE INVERSE PROBLEM OF EARLY TACTION SO IEEE TRANSACTIONS ON ROBOTICS AND AUTOMATION LA English DT Article ID COMPUTATIONAL VISION; POSED PROBLEMS AB In this paper we examine an application of analog neural networks to low-level processing of tactile sensory data. In analogy to the term early vision, we call the first level of processing required in tactile sensing early taction. Associated with almost all existing realizations of tactile sensors are fundamental inverse problems that must be solved. Solutions to these inverse problems are computationally demanding. Among such inverse problems, is the problem of "deblurring" or deconvolution of data provided by an array of tactile sensors that is also assumed to be corrupted by noise. We note that this inverse problem is ill posed and that the technique of regularization may be used to obtain solutions. The theory of nonlinear electrical networks is utilized to describe energy functions for a class of nonlinear networks and to show that the equilibrium states of the proposed network correspond to regularized solutions of the deblurring problem. An entropy regularizer is incorporated into the energy function of the network for the recovery of normal stress distributions. It is demonstrated by means of both computer simulations and hardware prototypes that analog neural networks provide an elegant solution to the need for fast, local computation in tactile sensing. An integrated circuit prototype of the proposed network that has been designed and fabricated is discussed as well. C1 UNIV MARYLAND,DEPT ELECT ENGN,COLLEGE PK,MD 20742. USN,RES LAB,NANOELECTR PROC FACIL,WASHINGTON,DC 20375. RP PATI, YC (reprint author), UNIV MARYLAND,SYST RES CTR,COLLEGE PK,MD 20742, USA. NR 54 TC 12 Z9 12 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 1042-296X J9 IEEE T ROBOTIC AUTOM JI IEEE Trans. Robot. Autom. PD APR PY 1992 VL 8 IS 2 BP 196 EP 212 DI 10.1109/70.134274 PG 17 WC Automation & Control Systems; Engineering, Electrical & Electronic; Robotics SC Automation & Control Systems; Engineering; Robotics GA HQ607 UT WOS:A1992HQ60700005 ER PT J AU BORDEN, B AF BORDEN, B TI MAXIMUM-ENTROPY REGULARIZATION IN INVERSE SYNTHETIC APERTURE RADAR IMAGERY SO IEEE TRANSACTIONS ON SIGNAL PROCESSING LA English DT Letter ID REDUCTION AB The method of maximum entropy is applied to the regularization of inverse synthetic aperture radar (ISAR) image reconstructions. This is accomplished by considering an ensemble of images with associated "allowed" probability density functions. Instead of directly considering the "solution" to be an image, we take it to be the a posteriori probability density found by minimizing a regularization functional composed of the usual "least squares" term and a Kullback (cross-entropy) information difference term. The desired image is then found as the expectation of this density. The basic model of this approach is similar to that used in usual maximum a posteriori analysis and allows for a more general relationship between the image and its "configuration entropy" than is usually employed. In addition, it eliminates the need for inappropriate nonnegativity constraints on the (generally complex-valued) image. RP BORDEN, B (reprint author), USN,CTR AIR WARFARE,DEPT RES,CHINA LAKE,CA 93555, USA. NR 16 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 1053-587X J9 IEEE T SIGNAL PROCES JI IEEE Trans. Signal Process. PD APR PY 1992 VL 40 IS 4 BP 969 EP 973 DI 10.1109/78.127968 PG 5 WC Engineering, Electrical & Electronic SC Engineering GA HL590 UT WOS:A1992HL59000022 ER PT J AU ROMANO, AJ WILLIAMS, EG RUSSO, KL SCHUETTE, LC AF ROMANO, AJ WILLIAMS, EG RUSSO, KL SCHUETTE, LC TI ON THE VISUALIZATION AND ANALYSIS OF FLUID-STRUCTURE INTERACTION FROM THE PERSPECTIVE OF INSTANTANEOUS INTENSITY SO JOURNAL DE PHYSIQUE IV LA English DT Article; Proceedings Paper CT 2ND FRENCH CONF ON ACOUSTICS CY APR 14-17, 1992 CL ARACHON, FRANCE SP SOC FRANCAISE ACOUST AB A formulation for the instantaneous structural intensity in thin cylindrical shells is presented, as well as a method for determining the tangential displacement components within a shell given a knowledge of the normal displacement and surface pressure only. These techniques are then applied to real, experimental data taken on a point-driven, fluid-loaded cylindrical shell, yielding the instantaneous intensity both within the shell and in the surrounding fluid due to an impulse delivered by the point driver. The mechanism of fluid-structure interaction in the very nearfield is briefly discussed. It is observed that in this case, only 21.5 % of the total energy delivered to the fluid by the structure, radiates to the farfield, while the remaining energy is seen to be delivered back into the structure by the fluid. C1 USN,RES LAB,WASHINGTON,DC 20375. RP ROMANO, AJ (reprint author), SACHS FREEMAN ASSOCIATES INC,1402 MCCORMICK DR,LANDOVER,MD 20785, USA. NR 7 TC 0 Z9 0 U1 0 U2 2 PU EDITIONS PHYSIQUE PI LES ULIS CEDEX PA Z I DE COURTABOEUF AVE 7 AV DU HOGGAR, BP 112, 91944 LES ULIS CEDEX, FRANCE SN 1155-4339 J9 J PHYS IV JI J. Phys. IV PD APR PY 1992 VL 2 IS C1 BP 597 EP 600 DI 10.1051/jp4:19921128 PN 2 PG 4 WC Physics, Multidisciplinary SC Physics GA HP029 UT WOS:A1992HP02900014 ER PT J AU MADIGOSKY, WM FIORITO, RB AF MADIGOSKY, WM FIORITO, RB TI DYNAMIC DUROMETER MEASUREMENT OF YOUNGS MODULUS AND LOSS FACTOR SO JOURNAL DE PHYSIQUE IV LA English DT Article; Proceedings Paper CT 2ND FRENCH CONF ON ACOUSTICS CY APR 14-17, 1992 CL ARACHON, FRANCE SP SOC FRANCAISE ACOUST AB The Shore hardness tester is used extensively throughout industry to determine the static modulus of materials. The new apparatus described here extends the capability of an indentor type tester into the dynamic regime, and provides a measurement of the dynamic shear or Young's modulus and loss factor as a function of frequency. The instrument, model and data of typical rubber samples are given and compared to other dynamic measurements. RP MADIGOSKY, WM (reprint author), USN,CTR SURFACE WEAP,MS R31,10901 NEW HAMPSHIRE AVE,SILVER SPRING,MD 20910, USA. NR 2 TC 0 Z9 0 U1 0 U2 0 PU EDITIONS PHYSIQUE PI LES ULIS CEDEX PA Z I DE COURTABOEUF AVE 7 AV DU HOGGAR, BP 112, 91944 LES ULIS CEDEX, FRANCE SN 1155-4339 J9 J PHYS IV JI J. Phys. IV PD APR PY 1992 VL 2 IS C1 BP 869 EP 872 DI 10.1051/jp4:19921190 PN 2 PG 4 WC Physics, Multidisciplinary SC Physics GA HP029 UT WOS:A1992HP02900076 ER PT J AU WERBY, MF DEAN, CE AF WERBY, MF DEAN, CE TI THEORETICAL PREDICTIONS FOR SCATTERING FROM ELASTIC SOLID CYLINDERS WITH HEMISPHERICAL CAPS AND COMPARISON WITH DATA SO JOURNAL DE PHYSIQUE IV LA English DT Article; Proceedings Paper CT 2ND FRENCH CONF ON ACOUSTICS CY APR 14-17, 1992 CL ARACHON, FRANCE SP SOC FRANCAISE ACOUST AB The extended boundary condition equations due to Waterman have led to a T-matrix that can describe scattering from axially symmetric targets over a broad frequency range. Recent interest in scattering from cylinders with hemispherical end caps has prompted us to analyze several examples from Le Havre. All phenomena predicted by the T-matrix calculations are confirmed by the data. In addition, bending resonances are predicted by the theoretical calculations and compared with predictions from bar theory. A series of predictions are made for various materials and aspect ratios to aid future experimental work. RP WERBY, MF (reprint author), USN,DIV NUMER MODELING,OCEANOG & ATMOSPHER RES LAB,BLDG 1100,BAY ST LOUIS,MS 39529, USA. NR 3 TC 0 Z9 0 U1 0 U2 0 PU EDITIONS PHYSIQUE PI LES ULIS CEDEX PA Z I DE COURTABOEUF AVE 7 AV DU HOGGAR, BP 112, 91944 LES ULIS CEDEX, FRANCE SN 1155-4339 J9 J PHYS IV JI J. Phys. IV PD APR PY 1992 VL 2 IS C1 BP 1019 EP 1022 DI 10.1051/jp4:19921224 PN 2 PG 4 WC Physics, Multidisciplinary SC Physics GA HP029 UT WOS:A1992HP02900110 ER PT J AU DEAN, CE WERBY, MF AF DEAN, CE WERBY, MF TI SHELL THEORIES WITH FLUID LOADING TO APPROXIMATE SCATTERING FROM SUBMERGED BOUNDED OBJECTS SO JOURNAL DE PHYSIQUE IV LA English DT Article; Proceedings Paper CT 2ND FRENCH CONF ON ACOUSTICS CY APR 14-17, 1992 CL ARACHON, FRANCE SP SOC FRANCAISE ACOUST AB One can predict sound scattering from fluid loaded elastic shells based on exact eloastodynamic theory provided the shell is a sphere or an infinite cylinder or some other geometry for which the elastodynamic equations are separable. Problems arise for more general shapes with only limited success for spheroids and cylinders with hemispherical end caps using the Extended Boundary Condition (EBC) method of Waterman. Both Radlinsky and the Varadans have employed a marriage of the EBC method with shell theories with some progress being made in the description of the scattering event. With this in mind our objective is to extend the progress made by the above researches by employing more general shell theories. It is usual to construct shell theories via use of geometrical constructions, or by use of variational principles. In this study, we explore the use of principles from differential geometry to construct appropriate theories that include translational motion, rotary inertia, and transverse shearing-stress as well as effects due to fluid loading. Some common shell theories which are employed for spherical elastic shells are deduced from these general terms and are compared to exact theory for verification as well as a test of limitations. RP DEAN, CE (reprint author), USN,DIV NUMER MODELING,OCEANOG & ATMOSPHER RES LAB,BLDG 1100,BAY ST LOUIS,MS 39529, USA. NR 4 TC 0 Z9 0 U1 0 U2 0 PU EDITIONS PHYSIQUE PI LES ULIS CEDEX PA Z I DE COURTABOEUF AVE 7 AV DU HOGGAR, BP 112, 91944 LES ULIS CEDEX, FRANCE SN 1155-4339 J9 J PHYS IV JI J. Phys. IV PD APR PY 1992 VL 2 IS C1 BP 1099 EP 1102 DI 10.1051/jp4:19921242 PN 2 PG 4 WC Physics, Multidisciplinary SC Physics GA HP029 UT WOS:A1992HP02900128 ER PT J AU MALONE, JD HYAMS, KC SMITH, ES YU, S AF MALONE, JD HYAMS, KC SMITH, ES YU, S TI HEPATITIS-C INFECTION IN A HIV-1 POSITIVE MILITARY POPULATION SO JOURNAL OF ACQUIRED IMMUNE DEFICIENCY SYNDROMES AND HUMAN RETROVIROLOGY LA English DT Letter ID NON-B-HEPATITIS; NON-A; VIRUS; TRANSMISSION C1 USN, MED RES INST, BETHESDA, MD 20814 USA. RP MALONE, JD (reprint author), NATL NAVAL MED CTR, DIV INFECT DIS, BETHESDA, MD 20814 USA. NR 9 TC 7 Z9 7 U1 0 U2 0 PU LIPPINCOTT-RAVEN PUBL PI PHILADELPHIA PA 227 EAST WASHINGTON SQ, PHILADELPHIA, PA 19106 SN 1077-9450 J9 J ACQ IMMUN DEF SYND JI J. Acquir. Immune Defic. Syndr. Hum. Retrovirol. PD APR PY 1992 VL 5 IS 4 BP 427 EP 428 PG 2 WC Immunology; Infectious Diseases SC Immunology; Infectious Diseases GA HK430 UT WOS:A1992HK43000018 PM 1548579 ER PT J AU DELAHOUSSAYE, PR PENCHINA, CM HEWETT, CA ZEIDLER, JR WILSON, RG AF DELAHOUSSAYE, PR PENCHINA, CM HEWETT, CA ZEIDLER, JR WILSON, RG TI HALL-MOBILITY AND CARRIER CONCENTRATION VERSUS TEMPERATURE FOR TYPE-IIA NATURAL INSULATING DIAMOND DOPED WITH BORON BY ION-IMPLANTATION SO JOURNAL OF APPLIED PHYSICS LA English DT Article ID ELECTRICAL-PROPERTIES; SEMICONDUCTORS; CARBON; FILMS AB A natural IIa diamond was implanted with boron ions at a substrate temperature of 80 K. Ohmic contacts (Mo/Au) were formed using a solid-state reaction process. Van der Pauw resistivity/Hall measurements were taken as a function of temperature from room temperature to nearly 600-degrees-C. Heating to approximately 350-degrees-C was necessary to stabilize resistance values to over 3.4 M-OMEGA/sq for the unimplanted and implanted sides, respectively, indicating possible hydrogen incorporation into the diamond during annealing of the metallized sample in hydrogen. Comparison of the electrical properties of the implanted and unimplanted sides showed that the boron implant introduced electrically active acceptors. C1 UNIV MASSACHUSETTS,DEPT PHYS & ASTRON,HASBROUCK LAB,AMHERST,MA 01003. HUGHES RES LABS,MALIBU,CA 90265. RP DELAHOUSSAYE, PR (reprint author), USN,CTR OCEAN SYST,CODE 553,271 CATALINA BLVD,SAN DIEGO,CA 92152, USA. NR 26 TC 15 Z9 15 U1 0 U2 3 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0021-8979 J9 J APPL PHYS JI J. Appl. Phys. PD APR 1 PY 1992 VL 71 IS 7 BP 3220 EP 3224 DI 10.1063/1.350967 PG 5 WC Physics, Applied SC Physics GA HM704 UT WOS:A1992HM70400023 ER PT J AU JIANG, Y TEICH, MC WANG, WI MEYER, JR AF JIANG, Y TEICH, MC WANG, WI MEYER, JR TI AUGER RECOMBINATION IN HGCDTE QUANTUM WIRES AND QUANTUM BOXES SO JOURNAL OF APPLIED PHYSICS LA English DT Article ID PUMPED LASER OSCILLATION; MOLECULAR-BEAM EPITAXY; HETEROSTRUCTURE LASERS; HG1-XCDXTE; GASB AB Quantum-wire and quantum-box structures for narrow-gap materials with small effective masses, such as HgCdTe, can readily be fabricated using current lithographic techniques. In this article, we calculate the Auger-recombination carrier lifetimes in HgCdTe quantum-wire and quantum-box structures, with band gaps in the 2-5-mu-m wavelength range. Quantum confinement is generally believed to increase the carrier lifetimes. However, we find the Auger recombination lifetime in a HgCdTe quantum wire is shorter than that in a quantum well, and it decreases as the wire width decreases because of the corresponding increase in the density of states. On the other hand, band-to-band Auger recombination is zero in a quantum box because the overlap functions vanish and because of the discrete nature of the energy levels. Therefore, within the confines of our model, we can expect improved temperature performance from long-wavelength quantum-box lasers but not from quantum-wire lasers. Furthermore, these conclusions are applicable for all types of band-to-band Auger processes and semiconductor materials. C1 USN, RES LAB, WASHINGTON, DC 20375 USA. RP COLUMBIA UNIV, DEPT ELECT ENGN, NEW YORK, NY 10027 USA. NR 21 TC 5 Z9 5 U1 0 U2 1 PU AMER INST PHYSICS PI MELVILLE PA 1305 WALT WHITMAN RD, STE 300, MELVILLE, NY 11747-4501 USA SN 0021-8979 EI 1089-7550 J9 J APPL PHYS JI J. Appl. Phys. PD APR 1 PY 1992 VL 71 IS 7 BP 3394 EP 3398 DI 10.1063/1.350935 PG 5 WC Physics, Applied SC Physics GA HM704 UT WOS:A1992HM70400049 ER PT J AU SINGH, DJ AF SINGH, DJ TI ARSENIC POISONING OF MAGNETISM IN BCC COBALT SO JOURNAL OF APPLIED PHYSICS LA English DT Article ID CO; FILMS; GAAS; EPITAXY; GROWTH; PHASES; FE AB Highly converged local spin-density approximation calculations are used to determine the effectiveness of As as a poisoning agent for the magnetism of bcc Co films grown on GaAs. To do this, supercell calculations of the magnetization were performed using an extension of the general potential linearized augmented plane-wave method for Co7As, Co15As, and Co31As. The effect of the nearest-neighbor relaxation around As impurities, calculated using total energy techniques, was included. It is found that substitutional As is moderately effective as a poisoning agent, each As atom contributes a moment of -3.8-mu(B), and this may be important in explaining the discrepancy of 0.2-0.3-mu(B) between the calculated magnetization of bcc Co and the measured magnetization of bcc Co films on GaAs. RP SINGH, DJ (reprint author), USN,RES LAB,COMPLEX SYST THEORY BRANCH,WASHINGTON,DC 20375, USA. RI Singh, David/I-2416-2012 NR 25 TC 16 Z9 16 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 1992 VL 71 IS 7 BP 3431 EP 3433 DI 10.1063/1.350941 PG 3 WC Physics, Applied SC Physics GA HM704 UT WOS:A1992HM70400055 ER PT J AU WEATHERSBY, PK SURVANSHI, SS HOMER, LD PARKER, E THALMANN, ED AF WEATHERSBY, PK SURVANSHI, SS HOMER, LD PARKER, E THALMANN, ED TI PREDICTING THE TIME OF OCCURRENCE OF DECOMPRESSION-SICKNESS SO JOURNAL OF APPLIED PHYSIOLOGY LA English DT Article DE BENDS; MATHEMATICAL MODELS; RISK MANAGEMENT; INERT GAS EXCHANGE AB Probabilistic models and maximum likelihood estimation have been used to predict the occurrence of decompression sickness (DCS). We indicate a means of extending the maximum likelihood parameter estimation procedure to make use of knowledge of the time at which DCS occurs. Two models were compared in fitting a data set of nearly 1,000 exposures, in which > 50 cases of DCS have known times of symptom onset. The additional information provided by the time at which DCS occurred gave us better estimates of model parameters. It was also possible to discriminate between good models, which predict both the occurrence of DCS and the time at which symptoms occur, and poorer models, which may predict only the overall occurrence. The refined models may be useful in new applications for customizing decompression strategies during complex dives involving various times at several different depths. Conditional probabilities of DCS for such dives may be reckoned as the dive is taking place and the decompression strategy adjusted to circumstance. Some of the mechanistic implications and the assumptions needed for safe application of decompression strategies on the basis of conditional probabilities are discussed. C1 USN,MED RES INST,BETHESDA,MD 20889. RP WEATHERSBY, PK (reprint author), USN,SUBMARINE MED RES LAB,NAVAL SUBMARINE BASE NEW LONDON,GROTON,CT 06349, USA. NR 19 TC 39 Z9 42 U1 0 U2 0 PU AMER PHYSIOLOGICAL SOC PI BETHESDA PA 9650 ROCKVILLE PIKE, BETHESDA, MD 20814 SN 8750-7587 J9 J APPL PHYSIOL JI J. Appl. Physiol. PD APR PY 1992 VL 72 IS 4 BP 1541 EP 1548 PG 8 WC Physiology; Sport Sciences SC Physiology; Sport Sciences GA HP086 UT WOS:A1992HP08600047 PM 1592748 ER PT J AU ARVEY, RD SALAS, E MAXWELL, SE AF ARVEY, RD SALAS, E MAXWELL, SE TI THE RELATIVE POWER OF TRAINING EVALUATION DESIGNS UNDER DIFFERENT COST CONFIGURATIONS SO JOURNAL OF APPLIED PSYCHOLOGY LA English DT Article AB After noting that the statistical power of training evaluation designs is a complex function of sample size, the reliability of the dependent measure, the correlation between pre- and posttest measures, and whether a randomized pretest-posttest or randomized posttest-only design is used, we show that the costs of conducting an evaluation are important considerations that also affect the relative power of the designs. Specifically, subject costs, administrative costs, and item development costs are different components that can absorb resources when training evaluations are conducted. When total cost resources are fixed, these separate costs affect the relative power of pretest-posttest and posttest-only designs differently, and the posttest-only design may be the more preferred design under many different conditions. In other words, a variety of design and parameter tradeoffs affect power when total costs are fixed. C1 USN,CTR TRAINING SYST,ORLANDO,FL. UNIV NOTRE DAME,NOTRE DAME,IN 46556. RP ARVEY, RD (reprint author), UNIV MINNESOTA,CTR IND RELAT,MINNEAPOLIS,MN 55455, USA. NR 9 TC 10 Z9 10 U1 2 U2 3 PU AMER PSYCHOLOGICAL ASSOC PI WASHINGTON PA 750 FIRST ST NE, WASHINGTON, DC 20002-4242 SN 0021-9010 J9 J APPL PSYCHOL JI J. Appl. Psychol. PD APR PY 1992 VL 77 IS 2 BP 155 EP 160 DI 10.1037/0021-9010.77.2.155 PG 6 WC Psychology, Applied; Management SC Psychology; Business & Economics GA HP070 UT WOS:A1992HP07000006 ER PT J AU DUTT, DA GRISCOM, DL SHAW, CM SHELBY, JE AF DUTT, DA GRISCOM, DL SHAW, CM SHELBY, JE TI AN ELECTRON-SPIN-RESONANCE STUDY OF GAMMA-IRRADIATED BARIUM GALLIOSILICATE GLASSES SO JOURNAL OF CHEMICAL PHYSICS LA English DT Article ID TRANSFORMATION-RANGE BEHAVIOR; CALCIUM ALUMINATE GLASSES; ALUMINOSILICATE GLASSES; SI-29; AL-27; SPECTROSCOPY; CRYSTALS; CENTERS AB Electron-spin-resonance spectroscopy has been used to study the structure of radiation-induced defects in a barium galliosilicate glass compositional series of BaO/Ga2O3 = 1.0 and 20-80 mol % SiO2. Spin-Hamiltonian parameters derived from computer line-shape simulations have been used to identify three oxygen-associated hole centers: a gallium-oxygen hole center and two variations of silicon-oxygen hole centers. Each of these defects contains an unpaired electron in a nonbonding oxygen p orbital. The compositional dependence of the ESR data is consistent with a gradual change from a Ga-based tetrahedral network to a Si-based tetrahedral network as the silica content is increased. C1 ALFRED UNIV,NEW YORK STATE COLL CERAM,GLASS SCI LAB,ALFRED,NY 14802. RP DUTT, DA (reprint author), USN,RES LAB,DIV OPT SCI,WASHINGTON,DC 20375, USA. NR 50 TC 0 Z9 0 U1 1 U2 3 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0021-9606 J9 J CHEM PHYS JI J. Chem. Phys. PD APR 1 PY 1992 VL 96 IS 7 BP 4852 EP 4859 DI 10.1063/1.462775 PG 8 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA HL099 UT WOS:A1992HL09900003 ER PT J AU PUTNAM, SD LAVIN, BS STONE, JR OLDFIELD, EC HOOPER, DG AF PUTNAM, SD LAVIN, BS STONE, JR OLDFIELD, EC HOOPER, DG TI EVALUATION OF THE STANDARDIZED DISK DIFFUSION AND AGAR DILUTION ANTIBIOTIC SUSCEPTIBILITY TEST METHODS BY USING STRAINS OF NEISSERIA-GONORRHOEAE FROM THE UNITED-STATES AND SOUTHEAST-ASIA SO JOURNAL OF CLINICAL MICROBIOLOGY LA English DT Article ID SPECTINOMYCIN; TETRACYCLINE; PENICILLIN AB Presently, most Neisseria gonorrhoeae testing is based on beta-lactamase tests and agar dilution with common therapeutic agents. The National Committee for Clinical Laboratory Standards (NCCLS) recently described a disk diffusion test that produced results similar to the reference agar dilution method for the antibiotic susceptibility of N. gonorrhoeae. We obtained 71 gonococcal isolates from active-duty males aboard a United States Navy vessel while deployed in the Western Pacific during 1989. In addition, 47 isolates of N. gonorrhoeae were obtained from sexually transmitted disease clinics within the branch clinic operations of the Naval Hospital, San Diego (SD), and tested. Antibiotic susceptibility tests by using the NCCLS agar dilution and disk diffusion techniques were compared. Among the Southeast Asia (SEA) isolates, 47% were beta-lactamase producers compared with 10.5% of the SD isolates. The mean MICs (SEA/SD) in micrograms per milliliter for both groups were as follows: penicillin, 88/15; tetracycline, 2.2/0.95; erythromycin, 1.2/0.49; ceftriaxone, 0.016/0.012; cefotaxime, 0.034/0.03; cefuroxime, 0.44/0.17; cefoxitin, 1.3/0.97; spectinomycin, 150/131; ciprofloxacin, 0.07/0.034; norfloxacin, 0.77/0.29; lomefloxacin, 0.15/0.056; and ofloxacin, 0.07/0.036. The established NCCLS interpretive criteria for both susceptibility methods appear applicable to domestic gonococcal strains. However, modifications may be necessary for the more antimicrobial agent-resistant SEA isolates on the basis of the clinical success and cure rates following the indicated single-dose regimens for the geographic region. C1 USN HOSP,DEPT INTERNAL MED,DIV INFECT DIS,SAN DIEGO,CA 92134. USN HOSP,DEPT CLIN INVEST,SAN DIEGO,CA 92134. RP PUTNAM, SD (reprint author), USN HOSP,DEPT LAB MED,DIV EXPTL PATHOL,SAN DIEGO,CA 92134, USA. NR 22 TC 23 Z9 23 U1 0 U2 3 PU AMER SOC MICROBIOLOGY PI WASHINGTON PA 1325 MASSACHUSETTS AVENUE, NW, WASHINGTON, DC 20005-4171 SN 0095-1137 J9 J CLIN MICROBIOL JI J. Clin. Microbiol. PD APR PY 1992 VL 30 IS 4 BP 974 EP 980 PG 7 WC Microbiology SC Microbiology GA HJ487 UT WOS:A1992HJ48700040 PM 1572986 ER PT J AU MORAN, MR AF MORAN, MR TI EFFECTS OF SEXUAL ORIENTATION SIMILARITY AND COUNSELOR EXPERIENCE LEVEL ON GAY MENS AND LESBIANS PERCEPTIONS OF COUNSELORS SO JOURNAL OF COUNSELING PSYCHOLOGY LA English DT Article ID DISABLED SUBJECTS PERCEPTIONS; DISABILITY STATUS; BLACK-STUDENTS; EXPERTNESS; ATTRACTIVENESS; PREFERENCE; RACE; CREDIBILITY; ATTITUDES; BEHAVIOR AB This analogue study investigated the effects of sexual orientation similarity of counselor and client as well as counselor experience level on perceptions of counselors by gay men and lesbians. After receiving pre-session information in which the variables of counselor sexual orientation (gay male/lesbian or heterosexual) and experience level (experienced vs. inexperienced) were manipulated, 40 gay male and 40 lesbian subjects in parallel experiments viewed different 15-min videotapes of same-sex counselor-client pairs and then completed the Counselor Rating Form (Barak & LaCrosse, 1975). Results indicated that the lesbian subjects rated the experienced therapists, both lesbian and heterosexual, as more expert; there were no other significant main or interaction effects. The results suggest that sexual orientation of the counselor may be a less salient concern of gay men and lesbians when the therapeutic issue is not sexual in nature. RP MORAN, MR (reprint author), USN ACAD,CTR MIDSHIPMEN COUNSELING,STOP 10K,ANNAPOLIS,MD 21402, USA. NR 40 TC 7 Z9 7 U1 0 U2 1 PU AMER PSYCHOLOGICAL ASSOC PI WASHINGTON PA 750 FIRST ST NE, WASHINGTON, DC 20002-4242 SN 0022-0167 J9 J COUNS PSYCHOL JI J. Couns. Psychol. PD APR PY 1992 VL 39 IS 2 BP 247 EP 251 DI 10.1037//0022-0167.39.2.247 PG 5 WC Psychology, Educational; Psychology, Applied SC Psychology GA HL825 UT WOS:A1992HL82500012 ER PT J AU VANDERAH, TA LOWEMA, CK BLISS, DE DECKER, MW OSOFSKY, MS SKELTON, EF MILLER, MM AF VANDERAH, TA LOWEMA, CK BLISS, DE DECKER, MW OSOFSKY, MS SKELTON, EF MILLER, MM TI GROWTH OF NEAR-FREE-STANDING YBA2CU3O7-TYPE CRYSTALS USING A SELF-DECANTING FLUX METHOD SO JOURNAL OF CRYSTAL GROWTH LA English DT Article ID HIGH-TEMPERATURE SUPERCONDUCTORS; LARGE SINGLE-CRYSTALS; PHYSICAL-PROPERTIES; CU-O; OXYGEN; OPPORTUNITIES; SUCCESSES; SYSTEM; STRESS; YBCO AB Near-free-standing platelets of YBa2Cu3Ox with 1-4 mm edges have been reproducibly obtained using a self-decanting BaO:CuO flux method. The overall stoichiometry of the growth mixture was Y:Ba:Cu = 1.0:18.4:45.1. The flux was induced to decant by a thermal gradient. After oxygen-annealing, crystals displayed sharp T(c)-values near 92 K. Crystals of ten of the RBa2Cu3Ox congeners (R = Pr, Nd, Sm, Eu, Gd, Dy, Ho, Er, Tm, Yb) and the "n-type" superconductor Nd1.85Ce0.15CuO4 were also grown using the method described. The results of an oxygen-annealing study of YBa2Cu3Ox crystals wherein transition temperature, transition width, apparent oxygen content, and annealing history were correlated, are also reported. C1 USN,RES LAB,WASHINGTON,DC 20375. RP VANDERAH, TA (reprint author), USN,CTR WEAP,RES DEPT,DIV CHEM,CHINA LAKE,CA 93555, USA. RI Osofsky, Michael/A-1050-2010 NR 50 TC 35 Z9 36 U1 0 U2 1 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 1992 VL 118 IS 3-4 BP 385 EP 395 DI 10.1016/0022-0248(92)90087-Y PG 11 WC Crystallography; Materials Science, Multidisciplinary; Physics, Applied SC Crystallography; Materials Science; Physics GA HP840 UT WOS:A1992HP84000017 ER PT J AU THOMPSON, BD AF THOMPSON, BD TI OPTIMIZATION OF LM2500 GAS GENERATOR AND POWER TURBINE TRIM-BALANCE TECHNIQUES SO JOURNAL OF ENGINEERING FOR GAS TURBINES AND POWER-TRANSACTIONS OF THE ASME LA English DT Article; Proceedings Paper CT 36TH INTERNATIONAL GAS TURBINE AND AEROENGINE CONGRESS AND EXPOSITION CY JUN 03-06, 1991 CL ORLANDO, FL AB A procedure has been developed by the U.S. Navy to trim-balance, in-place, the gas generator and power turbine rotor of the LM2500 Marine Gas Turbine Engine. This paper presents the theoretical background and the techniques necessary to optimize the procedure to balance the gas generator rotor. Additionally, a method was developed to trim balance LM2500 power turbines, To expand the implementation of both gas generator and power turbine trim-balancing, a capability has to be developed to minimize the effort required (trial weight runs, etc.). The objective was to be able to perform consistently what are called "First-Shot" trim balances. First-Shot trim balances require only one weight placement to bring the engine vibration levels to within the specified goals (less than 0.002 of an in. maximum amplitude) and that being the final trim weight. It was realized that the Least-Squares Influence-Coefficient Method, even with a good set of averaged influence coefficients, can lead to a number of trial weight experiments before the final trim weights can be placed. The method used to maximize the possibility of obtaining a First-Shot trim balance was to use modal information to tailor the influence coefficient sets to correct the most predominant and correctable imbalance problem. Since the influence coefficients were tailored, it became necessary to be able to identify, in the initial vibration survey, the type of response a particular LM2500 has. Using modal information obtained from a LM2500 rotor dynamics model and from the early trim-balance efforts, it was possible to identify the modal response of a given LM2500 and optimize the trim balance of that engine. With these improved techniques a 70 percent success rate for First-Shot trim balance has been achieved and the success rate of the trim balance procedure, as a whole, has been near 100 percent. RP THOMPSON, BD (reprint author), USN,SEA SYST COMMAND,WASHINGTON,DC 20350, USA. NR 5 TC 2 Z9 2 U1 1 U2 2 PU ASME-AMER SOC MECHANICAL ENG PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 SN 0742-4795 J9 J ENG GAS TURB POWER JI J. Eng. Gas. Turbines Power-Trans. ASME PD APR PY 1992 VL 114 IS 2 BP 222 EP 229 DI 10.1115/1.2906576 PG 8 WC Engineering, Mechanical SC Engineering GA HT254 UT WOS:A1992HT25400010 ER PT J AU MYERS, GD ARMSTRONG, JP WHITE, CD CLOUSER, S HARVEY, RJ AF MYERS, GD ARMSTRONG, JP WHITE, CD CLOUSER, S HARVEY, RJ TI DEVELOPMENT OF AN INNOVATIVE HIGH-TEMPERATURE GAS-TURBINE FUEL NOZZLE SO JOURNAL OF ENGINEERING FOR GAS TURBINES AND POWER-TRANSACTIONS OF THE ASME LA English DT Article; Proceedings Paper CT 36TH INTERNATIONAL GAS TURBINE AND AEROENGINE CONGRESS AND EXPOSITION CY JUN 03-06, 1991 CL ORLANDO, FL AB The objective of the innovative high-temperature fuel nozzle program was to design, fabricate, and test propulsion engine fuel nozzles capable of performance despite extreme fuel and air inlet temperatures. Although a variety of both passive and active methods for reducing fuel wetted-surface temperatures were studied, simple thermal barriers were found to offer the best combination of operability, cycle flexibility, and performance. A separate nozzle material study examined several nonmetallics and coating schemes for evidence of passivating or catalytic tendencies. Two pilotless airblast nozzles were developed by employing finite-element modeling to optimize thermal barriers in the stem and tip. Operability of these prototypes was compared to a current state-of-the art piloted, prefilming airblast nozzle, both on the spray bench and through testing in a can-type combustor. The three nozzles were then equipped with internal thermocouples and operated at 1600-degrees-F air inlet temperature while injecting marine diesel fuel heated to 350-degrees-F. Measured and predicted internal temperatures as a function of fuel flow rate were compared. Results show that the thermal barrier systems dramatically reduced wetted-surface temperatures and the potential for coke fouling, even in an extreme environment. C1 USN,CTR AIR PROPULS,TRENTON,NJ 08628. DELAVAN INC,W DES MOINES,IA 50265. RP MYERS, GD (reprint author), ALLIED SIGNAL AEROSP,DIV GARRETT ENGINE,PHOENIX,AZ 85010, USA. NR 5 TC 4 Z9 4 U1 0 U2 1 PU ASME-AMER SOC MECHANICAL ENG PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 SN 0742-4795 J9 J ENG GAS TURB POWER JI J. Eng. Gas. Turbines Power-Trans. ASME PD APR PY 1992 VL 114 IS 2 BP 401 EP 408 DI 10.1115/1.2906605 PG 8 WC Engineering, Mechanical SC Engineering GA HT254 UT WOS:A1992HT25400037 ER PT J AU HUI, CA AF HUI, CA TI WALKING OF THE SHORE CRAB PACHYGRAPSUS-CRASSIPES IN ITS 2 NATURAL ENVIRONMENTS SO JOURNAL OF EXPERIMENTAL BIOLOGY LA English DT Article DE WALKING; CRABS; LOCOMOTION; KINEMATICS; PACHYGRAPSUS-CRASSIPES ID DACTYL SENSORY INFLUENCES; ROCK LOBSTER LOCOMOTION; GHOST CRAB; VENTILATION; ENERGETICS; CRAYFISH; GAIT AB Video analyses of crabs walking on smooth and rocky terrains when in air and when submerged in water were conducted. Modifications of walking in the two environments, between which the animal's weight changes sixfold, are consistent with the goals of maximizing ease of walking and minimizing risk of injury. The duty factor (fraction of step cycle in which the dactylus is in contact with the substratum) was greater than 50 % when in air compared to less than 46 % when submerged, indicating a need for greater stability against the destabilizing vertical force of gravity when in air. The duty factors of the trailing and leading leg rows were the same for the two terrains in air but the trailing leg row had a larger duty factor when submerged, indicating a greater pushing effort to overcome drag forces. Width of stance differed among the four conditions and was narrowest in animals walking over rocky terrain in air, the condition which has the greatest potential for injury. The mean phase difference (percentage of a step cycle by which ipsilateral legs differ) between leading and trailing rows did not differ under any condition except for submerged smooth terrain, meeting the unique requirements of that condition. The observed walking speed range had no effect on stance, duty factor or phase difference. C1 USN,CTR OCEAN SYST,CHEM & BIOCHEM BRANCH,SAN DIEGO,CA 92152. NR 32 TC 12 Z9 13 U1 1 U2 4 PU COMPANY OF BIOLOGISTS LTD PI CAMBRIDGE PA BIDDER BUILDING CAMBRIDGE COMMERCIAL PARK COWLEY RD, CAMBRIDGE, CAMBS, ENGLAND CB4 4DL SN 0022-0949 J9 J EXP BIOL JI J. Exp. Biol. PD APR PY 1992 VL 165 BP 213 EP 227 PG 15 WC Biology SC Life Sciences & Biomedicine - Other Topics GA HP514 UT WOS:A1992HP51400014 ER PT J AU VANDENBERGHE, P FREEMAN, GJ NADLER, LM FLETCHER, MC KAMOUN, M TURKA, LA LEDBETTER, JA THOMPSON, CB JUNE, CH AF VANDENBERGHE, P FREEMAN, GJ NADLER, LM FLETCHER, MC KAMOUN, M TURKA, LA LEDBETTER, JA THOMPSON, CB JUNE, CH TI ANTIBODY AND B7/BB1-MEDIATED LIGATION OF THE CD28 RECEPTOR INDUCES TYROSINE PHOSPHORYLATION IN HUMAN T-CELLS SO JOURNAL OF EXPERIMENTAL MEDICINE LA English DT Article ID HUMAN LYMPHOCYTES-T; CD3+ MATURE THYMOCYTES; ANTIGEN RECEPTOR; B-CELLS; SIGNAL TRANSDUCTION; ACTIVATION PATHWAY; PROLIFERATIVE SIGNAL; GENE-EXPRESSION; SURFACE-ANTIGEN; 9.3 ANTIGEN AB CD28 is an adhesion receptor expressed as a 44-kD dimer on the surface of a major subset of human T cells. The CD28 receptor regulates the production of multiple lymphokines, including interleukin 2 (IL-2), by activation of a signal transduction pathway that is poorly understood. Here we show that ligation of CD28 by a monoclonal antibody (mAb) or by a natural ligand, B7/BB1, induces protein tyrosine phosphorylation that is distinct from T cell receptor (TCR)-induced tyrosine phosphorylation. CD28-induced protein tyrosine phosphorylation was greatly enhanced in cells that had been preactivated by ligation of the TCR, or by pretreatment with phorbol esters. Rapid and prolonged tyrosine phosphorylation of a single substrate, pp100, was induced in T cells after interaction with B7/BB1 presented on transfected Chinese hamster ovary (CHO) cells. Anti-B7 mAb inhibited B7/BB1 receptor-induced tyrosine phosphorylation, indicating that B7-CD28 interaction was required. CD28-induced tyrosine phosphorylation was independent of the TCR because it occurred in a variant of the Jurkat T cell line that does not express the TCR. Herbimycin A, a protein tyrosine kinase inhibitor, could prevent CD28-induced tyrosine phosphorylation and CD28-induced IL-2 production in normal T cells. The simultaneous crosslinking of CD28 and CD45, a tyrosine phosphatase, could prevent tyrosine phosphorylation of pp100. These results suggest that specific tyrosine phosphorylation, particularly of pp100, occurs directly as a result of CD28 ligand binding and is involved in transducing the signal delivered through CD28 by accessory cells that express the B7/BB1 receptor. Thus, this particular form of signal transduction may be relevant to lymphokine production and, potentially may provide a means to study the induction of self-tolerance, given the putative role of the costimulatory signal in the induction of T cell activation or anergy. C1 USN,MED RES INST,IMMUNE CELL BIOL PROGRAM,MAIL STOP 44,BETHESDA,MD 20814. HARVARD UNIV,SCH MED,DANA FARBER CANC INST,DIV TUMOR IMMUNOL,BOSTON,MA 02115. UNIV PENN,SCH MED,DEPT PATHOL & LAB MED,PHILADELPHIA,PA 19104. UNIV MICHIGAN,DEPT INTERNAL MED,ANN ARBOR,MI 48109. ONCOGEN CORP,SEATTLE,WA 98121. UNIV MICHIGAN,HOWARD HUGHES MED INST,ANN ARBOR,MI 48109. UNIV MICHIGAN,DEPT MED,ANN ARBOR,MI 48109. UNIV MICHIGAN,DEPT MICROBIOL IMMUNOL,ANN ARBOR,MI 48109. OI Vandenberghe, Peter/0000-0003-4719-1935 NR 40 TC 140 Z9 141 U1 1 U2 2 PU ROCKEFELLER UNIV PRESS PI NEW YORK PA 1114 FIRST AVE, 4TH FL, NEW YORK, NY 10021 SN 0022-1007 J9 J EXP MED JI J. Exp. Med. PD APR 1 PY 1992 VL 175 IS 4 BP 951 EP 960 DI 10.1084/jem.175.4.951 PG 10 WC Immunology; Medicine, Research & Experimental SC Immunology; Research & Experimental Medicine GA HL014 UT WOS:A1992HL01400009 PM 1372649 ER PT J AU RALSTON, ME AF RALSTON, ME TI GLAUCOMA SCREENING - RESPONSE SO JOURNAL OF FAMILY PRACTICE LA English DT Letter RP RALSTON, ME (reprint author), USN HOSP,SAN DIEGO,CA 92134, USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU APPLETON & LANGE PI E NORWALK PA 25 VAN ZANT ST, E NORWALK, CT 06855 SN 0094-3509 J9 J FAM PRACTICE JI J. Fam. Pract. PD APR PY 1992 VL 34 IS 4 BP 398 EP 398 PG 1 WC Primary Health Care; Medicine, General & Internal SC General & Internal Medicine GA HN859 UT WOS:A1992HN85900005 ER PT J AU FRANCIS, ML RYAN, J JOBLING, MG HOLMES, RK MOSS, J MOND, JJ AF FRANCIS, ML RYAN, J JOBLING, MG HOLMES, RK MOSS, J MOND, JJ TI CYCLIC AMP-INDEPENDENT EFFECTS OF CHOLERA-TOXIN ON B-CELL ACTIVATION .2. BINDING OF GANGLIOSIDE-GM1 INDUCES B-CELL ACTIVATION SO JOURNAL OF IMMUNOLOGY LA English DT Article ID KINASE-C ACTIVATION; ANTI-IG ANTIBODIES; SURFACE-IMMUNOGLOBULIN; MEMBRANE GANGLIOSIDES; MONOCLONAL-ANTIBODIES; BACTERIAL TOXINS; CROSS-LINKING; FREE CALCIUM; PROLIFERATION; RECEPTOR AB Although the physiologic function of gangliosides is unknown, evidence suggests they play a role in the regulation of cell growth. The binding of ganglioside G(M1) by recombinant B subunit of cholera toxin (rCT-B) inhibited mitogen-stimulated B cell proliferation without elevating intracellular cAMP. CT-B paradoxically enhanced the expression of MHC class II (Ia) molecules and minor lymphocyte-stimulating determinants without altering the expression of some other immunologically relevant B cell surface Ag. Increased expression of Ia was not detected until 4 h after stimulation, kinetics similar to those seen when B cells are stimulated with anti-Ig antibody or IL-4, suggesting that the enhancement was not the result of redistribution of existing cell surface markers but rather the result of a new metabolic event. Both the inhibitory and stimulatory effects of CT-B could be blocked by incubation of CT-B with ganglioside G(M1). Furthermore, enhancement of the CT-B-mediated effect was seen when additional ganglioside G(M1) was incorporated into the B cell membrane. rCT-B with a mutation that interfered with its binding to ganglioside G(M1) did not enhance Ia expression. Taken together, these results indicate that the observed effects of CT-B were most likely mediated through the binding of cell surface ganglioside G(M1). CT-B-mediated stimulation of la expression provides a potential explanation for the previously described ability of CT-B to act as an immunoadjuvant. These results suggest that the binding of ganglioside G(M1) has multiple B cell growth-regulating effects. C1 UNIFORMED SERV UNIV HLTH SCI, DEPT MED, ROOM A3060, 4301 JONES BRIDGE RD, BETHESDA, MD 20814 USA. UNIFORMED SERV UNIV HLTH SCI, DEPT MICROBIOL, BETHESDA, MD 20814 USA. USN, MED RES INST, BETHESDA, MD 20814 USA. NHLBI, CELLULAR METAB LAB, BETHESDA, MD 20892 USA. FU NIAID NIH HHS [AI24273, AI27465] NR 59 TC 72 Z9 73 U1 0 U2 0 PU AMER ASSOC IMMUNOLOGISTS PI BETHESDA PA 9650 ROCKVILLE PIKE, BETHESDA, MD 20814 USA SN 0022-1767 EI 1550-6606 J9 J IMMUNOL JI J. Immunol. PD APR 1 PY 1992 VL 148 IS 7 BP 1999 EP 2005 PG 7 WC Immunology SC Immunology GA HJ596 UT WOS:A1992HJ59600005 PM 1312102 ER PT J AU HAWKINS, RE MALONE, JD CLONINGER, LA ROZMAJZL, PJ LEWIS, D BUTLER, J CROSS, E GRAY, S HYAMS, KC AF HAWKINS, RE MALONE, JD CLONINGER, LA ROZMAJZL, PJ LEWIS, D BUTLER, J CROSS, E GRAY, S HYAMS, KC TI RISK OF VIRAL-HEPATITIS AMONG MILITARY PERSONNEL ASSIGNED TO UNITED-STATES NAVY SHIPS SO JOURNAL OF INFECTIOUS DISEASES LA English DT Note ID SEROLOGICAL MARKERS; ARMY SOLDIERS; GERMANY AB A prevalence study of 2072 male US shipboard military personnel scheduled for deployment to South America/West Africa and the Mediterranean was conducted to determine whether serologic evidence of prior hepatitis A, B, or C infection is associated with exposure in foreign countries. There were 210 subjects (10.1%) who had antibodies to hepatitis A virus (anti-HAV), 76 (3.7%) to hepatitis B core antigen (anti-HBc), and 9 (0.4%) to hepatitis C virus (anti-HCV). By multivariate analysis, anti-HAV seropositivity was independently associated with age, non-white racial/ethnic groups, birth outside of the United States, and prior Caribbean deployment for < 1 year. Anti-HBc seropositivity was independently associated with black and Filipino race/ethnicity, foreign birth, a history of a sexually transmitted disease, South Pacific/Indian Ocean deployment (< 12 months), and South Pacific or Mediterranean duty for (> 1 year). No geographic risk factors were associated with anti-HCV positivity. These data indicate that military personnel deployed outside the United States are at increased risk of viral hepatitis infection and should be considered for vaccination. C1 UNIFORMED SERV UNIV HLTH SCI,BETHESDA NAVAL HOSP,DEPT BIOMETR DIV INFECT DIS,BETHESDA,MD 20814. UNIFORMED SERV UNIV HLTH SCI,BETHESDA NAVAL HOSP,DEPT INTERNAL MED & PREVENT MED,DIV INFECT DIS,BETHESDA,MD 20814. USN,ENVIRONM & PREVENT MED UNIT 7,NAPLES,ITALY. USN HOSP,DEPT INTERNAL MED,GROTON,CT. USN,MED RES INST,DIV EPIDEMIOL,BETHESDA,MD 20814. NR 15 TC 40 Z9 40 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 APR PY 1992 VL 165 IS 4 BP 716 EP 719 PG 4 WC Immunology; Infectious Diseases; Microbiology SC Immunology; Infectious Diseases; Microbiology GA HJ642 UT WOS:A1992HJ64200017 PM 1552201 ER PT J AU TOLPIN, AE AF TOLPIN, AE TI PHYSICAL-PROPERTIES OF A NEW COHERENT STATE OF THE ALMOST DEGENERATE INFINITE-U LATTICE ANDERSON MODEL SO JOURNAL OF LOW TEMPERATURE PHYSICS LA English DT Article ID MIXED-VALENCE; EXPANSION; LIMIT AB A new approach toward understanding the heavy fermion systems (HFS) within a framework of the almost degenerate lattice Anderson Hamiltonian in the Kondo regime is proposed. In the coherent low temperature regime operators in the effective Hamiltonian are found to belong to an SU(2J + 3) dynamical algebra. A canonical transformation is employed to decouple the quasiparticle branches, thereby setting up the decoupling equation. It is found that this decoupling equation has a solution of the symmetry-altering type 1. The thermodynamic response functions and other quantities are calculated for this new state. This solution is a consequence of the degeneracy of the uncoupled f-orbitals. It is characterized by the interatomic hopping off-electrons, which Produces the spin delocalization regime and with the renormalized f-level pinned close to the Fermi level. This is also found to be the source of the apparent spin compensation regime, which is accompanied by large enhancement of the thermodynamic response functions. In addition, the calculated phase coherence length is found to be much greater than a lattice constant, thereby showing a many-body character of this new state. It is believed that this new state provides an accurate description of the heavy Fermion state at low temperatures. The stability conditions for the new regime are also discussed. RP TOLPIN, AE (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 18 TC 0 Z9 0 U1 0 U2 0 PU PLENUM PUBL CORP PI NEW YORK PA 233 SPRING ST, NEW YORK, NY 10013 SN 0022-2291 J9 J LOW TEMP PHYS JI J. Low Temp. Phys. PD APR PY 1992 VL 87 IS 1-2 BP 1 EP 22 DI 10.1007/BF00141564 PG 22 WC Physics, Applied; Physics, Condensed Matter SC Physics GA HR472 UT WOS:A1992HR47200001 ER PT J AU WILLIAMS, CM KREBS, JJ RACHFORD, FJ PRINZ, GA CHAIKEN, A AF WILLIAMS, CM KREBS, JJ RACHFORD, FJ PRINZ, GA CHAIKEN, A TI TORQUE MEASUREMENTS OF THE MAGNETIC-ANISOTROPY ENERGY OF ANTIFERROMAGNETIC-COUPLED FE/CR/FE LAYERS SO JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS LA English DT Article ID FE LAYERS; CR AB Various methods have been used to determine the exchange coupling, magnetocrystalline anisotropy energy, and complex switching behavior for epitaxially grown, antiferromagnetically coupled thin films of iron with interleaved chromium. In this paper, we determined the exchange coupling and magnetocrystalline anisotropy energy directly from the angle dependence of the magnetic free energy using torque magnetometry. The results are in very good agreement with ferromagnetic resonance, magnetization, and magnetoresistance measurements reported earlier on the same sample. RP WILLIAMS, CM (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 6 TC 8 Z9 8 U1 1 U2 3 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 1992 VL 110 IS 1-2 BP 61 EP 64 DI 10.1016/0304-8853(92)90012-D PG 4 WC Materials Science, Multidisciplinary; Physics, Condensed Matter SC Materials Science; Physics GA HW832 UT WOS:A1992HW83200010 ER PT J AU SCHWARTZ, IB AF SCHWARTZ, IB TI SMALL AMPLITUDE, LONG PERIOD OUTBREAKS IN SEASONALLY DRIVEN EPIDEMICS SO JOURNAL OF MATHEMATICAL BIOLOGY LA English DT Article DE CHAOS; NONLINEAR COUPLED OSCILLATORS; EPIDEMIOLOGY; DYNAMICS ID INFECTIOUS-DISEASES; MODELS; BIFURCATION AB It is now documented that childhood diseases such as measles, mumps, and chickenpox exhibit a wide range of recurrent behavior (periodic as well as chaotic) in large population centers in the first world. Mathematical models used in the past (such as the SEIR model with seasonal forcing) have been able to predict the onset of both periodic and chaotic sustained epidemics using parameters of childhood diseases. Although these models possess stable solutions which appear to have the correct frequency content, the corresponding outbreaks require extremely large populations to support the epidemic. This paper shows that by relaxing the assumption of uniformity in the supply of susceptibles, simple models predict stable long period oscillatory epidemics having small amplitude. Both coupled and single population models are considered. RP SCHWARTZ, IB (reprint author), USN,RES LAB,CODE 97003,WASHINGTON,DC 20375, USA. RI Schwartz, Ira/A-8073-2009 NR 23 TC 53 Z9 56 U1 0 U2 2 PU SPRINGER VERLAG PI NEW YORK PA 175 FIFTH AVE, NEW YORK, NY 10010 SN 0303-6812 J9 J MATH BIOL JI J. Math. Biol. PD APR PY 1992 VL 30 IS 5 BP 473 EP 491 DI 10.1007/BF00160532 PG 19 WC Biology; Mathematical & Computational Biology SC Life Sciences & Biomedicine - Other Topics; Mathematical & Computational Biology GA HP143 UT WOS:A1992HP14300003 PM 1578191 ER PT J AU ROBERTS, CR MITRA, R HYAMS, K BRODINE, SK LAL, RB AF ROBERTS, CR MITRA, R HYAMS, K BRODINE, SK LAL, RB TI SEROLOGIC DIFFERENTIATION OF HUMAN LYMPHOTROPIC-T VIRUS TYPE-I FROM TYPE-II INFECTION BY SYNTHETIC PEPTIDE IMMUNOASSAYS SO JOURNAL OF MEDICAL VIROLOGY LA English DT Article DE SELECT-HTLV; SYNTHEIA; POLYMERASE CHAIN REACTION ID HTLV-II AB Synthetic peptide-based serologic assays (Select-HTLV and SynthEIA) that distinguish the closely related human T-cell lymphotropic virus types I (HTLV-I) and II (HTLV-II) were tested blindly for their ability to correctly identify infection caused by either virus type. Of 57 HTLV-I and 38 HTLV-II specimens from individuals whose infections were confirmed by polymerase chain reaction, the Select-HTLV assay categorized 56 (98%) as HTLV-I, 36 (95%) as HTLV-II, and 3 (3%) as nontypeable. Similarly, the SynthEIA assay categorized 54 (95%) as HTLV-I, 29 (76%) as HTLV-II, and 12 (13%) as nontypeable. More importantly, no specimen was wrongly classified by either assay (100% specificity). Further, analysis of serial specimens from six patients also demonstrated concordant results with the PCR findings. Our results suggest that serotyping of HTLV infections can be achieved reliably by these peptide assays, thus the need for technically complex PCR-based HTLV typing, while not eliminated, can be greatly reduced. C1 CTR DIS CONTROL,CTR INFECT DIS,DIV VIRAL & RICKETTSIAL DIS,RETROVIRUS DIS BRANCH,MAIL STOP G19,ATLANTA,GA 30333. WALTER REED ARMY MED CTR,DEPT DIAGNOST RETROVIROL,DIV RETROVIROL,WASHINGTON,DC 20307. SRA TECHNOL INC,ROCKVILLE,MD. USN,MED RES INST,BETHESDA,MD 20814. USN HOSP,DIV INFECT DIS,SAN DIEGO,CA 92134. NR 19 TC 15 Z9 15 U1 0 U2 0 PU WILEY-LISS PI NEW YORK PA DIV JOHN WILEY & SONS INC 605 THIRD AVE, NEW YORK, NY 10158-0012 SN 0146-6615 J9 J MED VIROL JI J. Med. Virol. PD APR PY 1992 VL 36 IS 4 BP 298 EP 302 DI 10.1002/jmv.1890360412 PG 5 WC Virology SC Virology GA HL082 UT WOS:A1992HL08200011 PM 1578221 ER PT J AU FREED, WJ WILLINGHAM, G HEIM, R AF FREED, WJ WILLINGHAM, G HEIM, R TI EFFECTS OF ADRENAL-MEDULLA AND SCIATIC-NERVE COGRAFTS IN RATS WITH UNILATERAL SUBSTANTIA-NIGRA LESIONS SO JOURNAL OF NEURAL TRANSPLANTATION & PLASTICITY LA English DT Article DE PARKINSONS DISEASE; ADRENAL MEDULLA; GRAFTS; BRAIN GRAFTS; TRANSPLANTATION; SUBSTANTIA-NIGRA; CHROMAFFIN CELLS ID CHROMAFFIN CELLS; PERIPHERAL-NERVE; GROWTH-FACTOR; DENERVATED STRIATUM; ROTATIONAL BEHAVIOR; PARKINSONS-DISEASE; CAUDATE-NUCLEUS; FOLLOW-UP; COGRAFTS; ENHANCE AB Major limitations of adrenal medulla transplantation in animal models of Parkinson's disease have been the relatively small behavioral effects and the poor or inconsistent graft survival. Transplantation of fragments of sural nerve in combination with adrenal medulla has been reported to increase the survival of chromaffin cells in adrenal medulla grafts in primates. In the present study, the possibility was tested that peripheral nerve co-grafts would increase the functional effects of adrenal medulla grafts in a 6-hydroxydopamine-lesioned rat model. Animals received unilateral substantia nigra lesions, and subsequently received intraventricular grafts of adrenal medulla, sciatic nerve, adrenal medulla plus sciatic nerve, or sham grafts consisting of medium only. Functional effects of the grafts were tested using apomorphine-induced rotational behavior. The sciatic nerve co-grafts did not increase the survival of TH-immunoreactive chromaffin cells. The co-grafting treatment also did not augment the overall effect of adrenal medulla grafts on rotational behavior. In the animals with substantial numbers of surviving chromaffin cells, however, the animals with sciatic nerve co-grafts showed greater decreases in rotational behavior as compared to the animals with adrenal medulla grafts alone, even though the number of surviving cells was not increased. C1 USN,NATL NAVAL MED CTR,DEPT NEUROSURG,BETHESDA,MD 20889. RP FREED, WJ (reprint author), NIMH,NEUROSCI CTR ST ELIZABETHS,NEUROPSYCHIAT BRANCH,WASHINGTON,DC 20032, USA. NR 38 TC 8 Z9 8 U1 0 U2 0 PU FREUND PUBLISHING HOUSE PI LONDON PA STE 500, CHESHAM HOUSE, 150 REGENT ST, LONDON, ENGLAND W1R 5FA SN 0792-8483 J9 J NEURAL TRANSP PLAS JI J. Neural Transplant. Plast. PD APR-SEP PY 1992 VL 3 IS 2-3 BP 159 EP 167 PG 9 WC Neurosciences; Transplantation SC Neurosciences & Neurology; Transplantation GA JF330 UT WOS:A1992JF33000010 PM 1355367 ER PT J AU SHANNON, KM MENTZER, WC ABELS, RI WERTZ, M THAYERMORIYAMA, J LI, WY THOMPSON, D DECELLE, S PHIBBS, RH AF SHANNON, KM MENTZER, WC ABELS, RI WERTZ, M THAYERMORIYAMA, J LI, WY THOMPSON, D DECELLE, S PHIBBS, RH TI ENHANCEMENT OF ERYTHROPOIESIS BY RECOMBINANT-HUMAN-ERYTHROPOIETIN IN LOW-BIRTH-WEIGHT INFANTS - A PILOT-STUDY SO JOURNAL OF PEDIATRICS LA English DT Article ID ERYTHROID PROGENITORS; PREMATURE-INFANTS; ANEMIA; TRANSFUSION; NEED AB We randomly assigned eight concurrently symptom-free premature infants (birth weight less-than-or-equal-to 1250 gm) at high risk of requiring erythrocyte transfusions for anemia of prematurity to 6 weeks of intensive treatment with either subcutaneous recombinant human erythropoietin (r-HuEPO group) or a placebo (control group). Treatment with rHuEPO was initiated at a dose of 100 units/kg per day 5 days a week, and was increased to 200 units/kg per day after 2 or 3 weeks if target reticulocyte counts were not achieved. All patients were given supplemental oral iron therapy at a dose of 6 mg/kg per day, as tolerated. Mean reticulocyte counts in r-HuEPO-treated and control infants were 64,600 versus 67,500 cells/mm3 at entry; were 245,600 versus 78,000 cells/mm3 after 1 week; and averaged 262,600 versus 136,400 cells/mm3 during the study. Mean reticulocyte counts in r-HuEPO-treated infants were 251,200 cells/mm3 during the weeks when r-HuEPO, 100 units/kg per day, was given, and were 269,500 cells/mm3 after the dose was increased to 200 units/kg per day. Mean hematocrit values at entry were 33.4% in babies who received r-HuEPO versus 33.6% in the control subjects, and were 31.4% in r-HuEPO-treated and 25.2% in the control subjects at the end of treatment. One r-HuEPO-treated and three control babies received transfusions during the study; the total volume of blood given was 17 ml in the r-HuEPO group and 101 ml in the control subjects. The percentage of hemoglobin F increased in infants not given transfusions. We conclude that r-HuEPO stimulates endogenous erythropoiesis in small premature babies who are receiving supplemental oral iron therapy. A controlled multicenter trial has been undertaken to confirm these promising preliminary observations. C1 UNIV CALIF SAN FRANCISCO, CARDIOVASC RES INST, SAN FRANCISCO, CA 94143 USA. USN HOSP, DEPT PEDIAT, OAKLAND, CA USA. RW JOHNSON PHARMACEUT RES INST, RARITAN, NJ USA. RP SHANNON, KM (reprint author), UNIV CALIF SAN FRANCISCO, DEPT PEDIAT, ROOM U-432, BOX 0724, SAN FRANCISCO, CA 94143 USA. FU NCRR NIH HHS [MO1RR01271]; NIDDK NIH HHS [DK 32094] NR 23 TC 75 Z9 75 U1 0 U2 0 PU MOSBY-ELSEVIER PI NEW YORK PA 360 PARK AVENUE SOUTH, NEW YORK, NY 10010-1710 USA SN 0022-3476 EI 1097-6833 J9 J PEDIATR-US JI J. Pediatr. PD APR PY 1992 VL 120 IS 4 BP 586 EP 592 DI 10.1016/S0022-3476(05)82488-6 PN 1 PG 7 WC Pediatrics SC Pediatrics GA HN861 UT WOS:A1992HN86100018 PM 1372652 ER PT J AU SIMONSON, LG ROBINSON, PJ PRANGER, RJ COHEN, ME MORTON, HE AF SIMONSON, LG ROBINSON, PJ PRANGER, RJ COHEN, ME MORTON, HE TI TREPONEMA-DENTICOLA AND PORPHYROMONAS-GINGIVALIS AS PROGNOSTIC MARKERS FOLLOWING PERIODONTAL TREATMENT SO JOURNAL OF PERIODONTOLOGY LA English DT Article DE PERIODONTITIS MICROBIOLOGY; PERIODONTAL DISEASE MICROBIOLOGY; DENTAL PLAQUE; MICROBIOLOGY; PORPHYROMONAS-GINGIVALIS; PROGNOSIS; TREPONEMA-DENTICOLA ID BACTEROIDES-GINGIVALIS; ACTINOBACILLUS-ACTINOMYCETEMCOMITANS; MONOCLONAL-ANTIBODIES; SUBGINGIVAL BACTERIA; ADULT PERIODONTITIS; DISEASE; SEVERITY; THERAPY; PLAQUES; HUMANS AB SUBGINGIVAL PLAQUE SAMPLES were collected from individuals with advanced periodontitis before and 3 to 11 weeks after scaling and root planing periodontal treatment. The plaque levels of Treponema denticola and Porphyromonas gingivalis antigens were measured before and after treatment by a quantitative immunoassay procedure using monoclonal antibodies specific for these oral bacteria. A decrease in mean levels of T. denticola (P < .05) and P. gingivalis antigens (P < .09) were observed following periodontal therapy. Improved health, as measured by a decrease in probing depth, was associated with a decrease in T. denticola antigen (P < .05). These results suggest that the T. denticola levels of successfully treated sites decreased, while non-responding sites had levels of this microbial marker which were equal to or greater than the pre-treatment levels. These results provide additional evidence that T. denticola is associated with human adult severe periodontal disease, and can serve as a prognostic marker for disease recurrence. C1 NORTHWESTERN UNIV,SCH DENT,CHICAGO,IL 60611. RP SIMONSON, LG (reprint author), USN,DENT RES INST,BLDG 1-H,GREAT LAKES,IL 60088, USA. NR 25 TC 58 Z9 62 U1 0 U2 2 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 1992 VL 63 IS 4 BP 270 EP 273 PG 4 WC Dentistry, Oral Surgery & Medicine SC Dentistry, Oral Surgery & Medicine GA JA084 UT WOS:A1992JA08400005 PM 1315388 ER PT J AU HORNING, GM HATCH, CL COHEN, ME AF HORNING, GM HATCH, CL COHEN, ME TI RISK INDICATORS FOR PERIODONTITIS IN A MILITARY TREATMENT POPULATION SO JOURNAL OF PERIODONTOLOGY LA English DT Article DE TOBACCO ADVERSE EFFECTS; PERIODONTITIS ETIOLOGY; PERIODONTITIS EPIDEMIOLOGY; PERIDONTAL DISEASES ETIOLOGY; PERIODONTAL DISEASES EPIDEMIOLOGY; RISK FACTORS ID CIGARETTE-SMOKING; TREATMENT NEEDS; DISEASE; PREVALENCE; NICOTINE; THERAPY; SMOKERS; TEETH AB THE ASSOCIATION BETWEEN THE PERIODONTAL diagnosis and a variety of subject characteristics was studied in a group of 1,783 patients examined at a large military dental clinic. In order of importance, age greater than 30, smoking, male sex, and Filipino racial background were all found to be statistically significant risk indicators for the presence of moderate or advanced periodontitis. A logistic regression equation serving as a predictive model employing these four variables was presented. The strong association found between smoking and advanced periodontitis is consistent with the hypothesis that smoking has cumulative detrimental effects on periodontal health. While these and other risk indicators are neither causative, diagnostic, nor prognostic, they may be helpful in alerting the clinician to more carefully evaluate other clinical signs or laboratory findings of disease. C1 USN,CTR DENT,CTR TRAINING,DEPT ORAL DIAG ORAL MED,ORLANDO,FL. USN,DENT RES INST,GREAT LAKES,IL 60088. RP HORNING, GM (reprint author), USN,DENT CO 23,MCAGCC 29,PALMS,CA 92278, USA. NR 42 TC 64 Z9 68 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 1992 VL 63 IS 4 BP 297 EP 302 PG 6 WC Dentistry, Oral Surgery & Medicine SC Dentistry, Oral Surgery & Medicine GA JA084 UT WOS:A1992JA08400010 PM 1573543 ER PT J AU MCMASTER, DR HOUSE, RC ANDERSON, MH PELLEU, GB AF MCMASTER, DR HOUSE, RC ANDERSON, MH PELLEU, GB TI THE EFFECT OF SLOT PREPARATION LENGTH ON THE TRANSVERSE STRENGTH OF SLOT-RETAINED RESTORATIONS SO JOURNAL OF PROSTHETIC DENTISTRY LA English DT Article ID AMALGAM RESTORATIONS; RETENTIVE PINS; RESISTANCE AB An in vitro study was conducted (1) to compare fracture strength of amalgam restorations retained with retentive slots of different lengths when stressed with a transverse force, (2) to determine if beveling the slot preparation resulted in an increase in fracture resistance to a transverse force, and (3) to evaluate the incidence of unrestorable tooth fracture as it relates to slot preparation length. Six groups of 10 specimens were prepared with slots of increasing length, with each specimen receiving four slots of equal length. Slot preparations in group 6 were beveled. Results showed that shorter slot preparations provided statistically equal amounts of resistance to a transverse force as did the longer preparations. Beveling the slot preparation did not significantly increase fracture strength. Specimens restored with longer slot preparations failed unrestorably more often than restorations retained with shorter slot preparations. C1 USN,NATL NAVAL DENT CTR,SCH DENT,DEPT COMPREHENS DENT,BETHESDA,MD 20889. NR 24 TC 1 Z9 1 U1 0 U2 1 PU MOSBY-YEAR BOOK INC PI ST LOUIS PA 11830 WESTLINE INDUSTRIAL DR, ST LOUIS, MO 63146-3318 SN 0022-3913 J9 J PROSTHET DENT JI J. Prosthet. Dent. PD APR PY 1992 VL 67 IS 4 BP 472 EP 477 DI 10.1016/0022-3913(92)90075-L PG 6 WC Dentistry, Oral Surgery & Medicine SC Dentistry, Oral Surgery & Medicine GA HL265 UT WOS:A1992HL26500008 PM 1507128 ER PT J AU JOHNSON, PF AF JOHNSON, PF TI RACIAL NORMS - AESTHETIC AND PROSTHODONTIC IMPLICATIONS SO JOURNAL OF PROSTHETIC DENTISTRY LA English DT Article ID NORTHERN; PLANE AB A review of the orthodontic literature reveals that different races have different cephalometric norms. This has great implications in the placement and arrangement of teeth and in the evaluation of esthetics in people of dissimilar ethnic origins. In the diverse American society, prosthodontists and restorative dentists need to be concerned with the phylogenetic characteristics of their patients. The resultant esthetic differences can have significant importance in the function and design of prostheses. RP JOHNSON, PF (reprint author), USN,DENT CLIN,AREA DENT LAB,5565 GROSSMONT CTR DR,BLDG 1,SUITE 110,LA MESA,CA 91942, USA. NR 41 TC 12 Z9 14 U1 0 U2 1 PU MOSBY-YEAR BOOK INC PI ST LOUIS PA 11830 WESTLINE INDUSTRIAL DR, ST LOUIS, MO 63146-3318 SN 0022-3913 J9 J PROSTHET DENT JI J. Prosthet. Dent. PD APR PY 1992 VL 67 IS 4 BP 502 EP 508 DI 10.1016/0022-3913(92)90081-K PG 7 WC Dentistry, Oral Surgery & Medicine SC Dentistry, Oral Surgery & Medicine GA HL265 UT WOS:A1992HL26500014 PM 1507134 ER PT J AU PHOTIADIS, DM AF PHOTIADIS, DM TI THE EFFECT OF IRREGULARITY ON THE SCATTERING OF ACOUSTIC-WAVES FROM A RIBBED PLATE SO JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA LA English DT Article ID FLUID AB The scattered field from an irregularly ribbed fluid-loaded plate is "measured" using numerical simulations. The diffuse field scattered by the irregularity exhibits strong coherent features in the far-field scattering pattern associated with phase matching to locally propagating Bloch waves on the structure. These features are also apparent in the scattering from finite periodic arrays, but are strongly enhanced by irregularity. Some examples of the behavior of the system are presented and the scaling of the cross section with the number of scatters and irregularity is determined. RP PHOTIADIS, DM (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 12 TC 27 Z9 27 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 1992 VL 91 IS 4 BP 1897 EP 1903 DI 10.1121/1.403700 PN 1 PG 7 WC Acoustics; Audiology & Speech-Language Pathology SC Acoustics; Audiology & Speech-Language Pathology GA HP367 UT WOS:A1992HP36700010 ER PT J AU KENNEDY, RM AF KENNEDY, RM TI SEA-SURFACE DIPOLE SOUND SOURCE DEPENDENCE ON WAVE-BREAKING VARIABLES SO JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA LA English DT Article ID WIND-GENERATED NOISE; SPECTRA; OCEAN AB Estimates of the surface dipole sound source spectrum per unit water surface area were obtained from 40-4000 Hz and related to environmental parameters characterizing the wind and wave fields. The results give additional credence to the role of entrapped air bubbles and bubble clouds in the generation of acoustic ambient and indicate a change in the entrainment mechanism when the water surface transitions from aerodynamically "smooth" to "rough." The measured dipole sound source spectrum, when scaled by the gravity wave equilibrium range wave-breaking rate of energy dissipation appears to be a self-similar function dependent only on the acoustic frequency nondimensionalized by the frequency of peak acoustic spectral level. RP KENNEDY, RM (reprint author), USN,CTR UNDERWATER SYST,DEPT TEST & EVALUAT,W PALM BEACH,FL 33402, USA. NR 29 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 1992 VL 91 IS 4 BP 1974 EP 1982 DI 10.1121/1.403681 PN 1 PG 9 WC Acoustics; Audiology & Speech-Language Pathology SC Acoustics; Audiology & Speech-Language Pathology GA HP367 UT WOS:A1992HP36700019 ER PT J AU JIMENOFERNANDEZ, I UBERALL, H MADIGOSKY, WM FIORITO, RB AF JIMENOFERNANDEZ, I UBERALL, H MADIGOSKY, WM FIORITO, RB TI RESONANCE DECOMPOSITION FOR THE VIBRATORY RESPONSE OF A VISCOELASTIC ROD SO JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA LA English DT Article AB The vibratory response of a driven viscoelastic rod has been used in earlier investigations to measure the complex elastic modulus of the rod material. The transfer function T, i.e., the ratio of displacements (or accelerations) at the end of the rod divided by those at the driven end, is obtained as a function of frequency and rod length. In terms of these variables, it exhibits resonance peaks. In the present work, following the developments of Fiorito et al. [J. Acoust. Soc. Am. 79, 222 (1986)], the transfer function is represented as a meromorphic function of the frequency with complex poles, in order to isolate the individual resonances. Such a representation allows a clean determination, of resonance frequencies and widths, and thus leads to a more sensitive measurement of the complex elastic modulus of the rod material. Comparison of exact theory and this resonance theory formulation of T is presented for various rod materials. C1 USN,CTR SURFACE WARFARE,SILVER SPRING,MD 20903. RP JIMENOFERNANDEZ, I (reprint author), CATHOLIC UNIV AMER,DEPT PHYS,WASHINGTON,DC 20064, USA. NR 10 TC 3 Z9 3 U1 0 U2 0 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0001-4966 J9 J ACOUST SOC AM JI J. Acoust. Soc. Am. PD APR PY 1992 VL 91 IS 4 BP 2030 EP 2033 DI 10.1121/1.403688 PN 1 PG 4 WC Acoustics; Audiology & Speech-Language Pathology SC Acoustics; Audiology & Speech-Language Pathology GA HP367 UT WOS:A1992HP36700026 ER PT J AU KELLY, JG CARPENTER, RN TAGUE, JA AF KELLY, JG CARPENTER, RN TAGUE, JA TI OBJECT CLASSIFICATION AND ACOUSTIC IMAGING WITH ACTIVE SONAR SO JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA LA English DT Article AB The theoretical underpinnings of underwater acoustic classification and imaging using high-frequency active sonar are studied. All essential components of practical classification systems are incorporated in a Bayesian theoretic framework. The optimum decision rules and array processing are presented and evaluated. A systematic performance evaluation methodology is derived. New results quantify the relationship between classifier performance and object geometry, acoustic imaging, and the accuracy of a priori knowledge infused into the processor. C1 OHIO UNIV,DEPT ELECT & COMP ENGN,ATHENS,OH 45701. RP KELLY, JG (reprint author), USN,CTR UNDERWATER SYST,CODE 821,NEWPORT,RI 02841, USA. 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 0001-4966 J9 J ACOUST SOC AM JI J. Acoust. Soc. Am. PD APR PY 1992 VL 91 IS 4 BP 2073 EP 2081 DI 10.1121/1.403693 PN 1 PG 9 WC Acoustics; Audiology & Speech-Language Pathology SC Acoustics; Audiology & Speech-Language Pathology GA HP367 UT WOS:A1992HP36700031 PM 1597599 ER PT J AU HANNA, TE AF HANNA, TE TI DISCRIMINATION AND IDENTIFICATION OF MODULATION RATE USING A NOISE CARRIER SO JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA LA English DT Article ID INTENSITY PERCEPTION; BROAD-BAND; RESOLUTION; SENSITIVITY; FREQUENCY AB Modulation-rate perception was measured for three tasks: a fixed-standard, forced-choice discrimination task with a 500-ms interstimulus interval; a random-standard, forced-choice discrimination task with an 8-s interstimulus interval; and an identification task. Thresholds were obtained for modulation rates from 14-224 Hz using noise carriers bandpass filtered from 500-4000 Hz, 500-1600 Hz, 1700-2800 Hz, and 2900-4000 Hz. The four bands yielded similar results except for modulation rates greater than 100 Hz, where the 500- to 1600-Hz thresholds were higher. Fixed-standard discrimination thresholds were about 3 Hz for modulation rates up to 66 Hz. The increase of thresholds for modulation rates above 66 Hz could be due to temporal resolution limits with a time constant of about 2-3 ms. For modulation rates above 100 Hz, critical-band filtering may further decrease sensitivity for the 500- to 1600-Hz noise band. Resolution in the random-standard discrimination task was similar to that for the identification task. Thresholds were elevated relative to fixed-standard thresholds except at the extremes of the stimulus range. In the random-standard discrimination task, a pronounced criterion bias was present for stimuli near the extremes of the range. Durlach and Braida's model [N. I. Durlach and L. D. Braida, J. Acoust. Soc. Am. 46, 372-383 (1969)] describes the data well and provides quantitative measures for our data in good agreement with those for intensity perception. RP HANNA, TE (reprint author), USN,SUBMARINE MED RES LAB,BOX 900,NAVAL SUBMARINE BASE NEW LONDON,GROTON,CT 06349, USA. NR 25 TC 24 Z9 25 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 1992 VL 91 IS 4 BP 2122 EP 2128 DI 10.1121/1.403698 PN 1 PG 7 WC Acoustics; Audiology & Speech-Language Pathology SC Acoustics; Audiology & Speech-Language Pathology GA HP367 UT WOS:A1992HP36700036 PM 1597603 ER PT J AU RITTENMYER, KM DUBBELDAY, PS AF RITTENMYER, KM DUBBELDAY, PS TI DIRECT MEASUREMENT OF THE TEMPERATURE-DEPENDENT PIEZOELECTRIC COEFFICIENTS OF COMPOSITE-MATERIALS BY LASER DOPPLER VIBROMETRY SO JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA LA English DT Article AB The longitudinal (d33) and transverse (d31) piezoelectric coefficients of a piezoelectric composite material (NTK PR-306) are determined as functions of frequency and temperature by using laser Doppler vibrometry to measure the strain induced in the sample by an electric field. Measurements are performed over the temperature range from -50-degrees-C to 50-degrees-C and over a frequency range from 0.1-10 kHz. Some measurements were made at frequencies up to 100 kHz in order to demonstrate the ability of the technique at frequencies in the vicinity of an electromechanical resonance. The results show that the viscoelastic relaxation affects the piezoelectric response of the composite material primarily through the dielectric stiffness rather than the elastic stiffness. The d33 coefficient is observed to relax in a normal fashion near the glass transition of the polymer phase whereas the relaxation in the d31 coefficient varies over the entire measured range of temperature. RP RITTENMYER, KM (reprint author), USN, RES LAB, UNDERWATER SOUND REFERENCE DETACHMENT, POB 568337, ORLANDO, FL 32856 USA. NR 9 TC 15 Z9 15 U1 1 U2 2 PU ACOUSTICAL SOC AMER AMER INST PHYSICS PI MELVILLE PA STE 1 NO 1, 2 HUNTINGTON QUADRANGLE, MELVILLE, NY 11747-4502 USA SN 0001-4966 EI 1520-8524 J9 J ACOUST SOC AM JI J. Acoust. Soc. Am. PD APR PY 1992 VL 91 IS 4 BP 2254 EP 2260 DI 10.1121/1.403659 PN 1 PG 7 WC Acoustics; Audiology & Speech-Language Pathology SC Acoustics; Audiology & Speech-Language Pathology GA HP367 UT WOS:A1992HP36700049 ER PT J AU RULLER, JA FRIEBELE, EJ AF RULLER, JA FRIEBELE, EJ TI EVIDENCE OF SECONDARY-PHASE SEPARATION IN AN ALKALI BOROSILICATE GLASS SO JOURNAL OF THE AMERICAN CERAMIC SOCIETY LA English DT Article ID QUANTUM AB Transmission electron micrographs of a borosilicate glass containing CuCl semiconducting microcrystals clearly show that secondary-phase separation is present. There are two minor-phase (droplet) size distributions which indicate that upon heat treatment the initial droplet phase oversaturates, thus causing secondary-phase separation. C1 USN,RES LAB,OPT MAT GRP,WASHINGTON,DC 20375. NR 17 TC 1 Z9 1 U1 1 U2 3 PU AMER CERAMIC SOC PI WESTERVILLE PA 735 CERAMIC PLACE, PO BOX 6136, WESTERVILLE, OH 43081-6136 SN 0002-7820 J9 J AM CERAM SOC JI J. Am. Ceram. Soc. PD APR PY 1992 VL 75 IS 4 BP 1026 EP 1027 DI 10.1111/j.1151-2916.1992.tb04181.x PG 2 WC Materials Science, Ceramics SC Materials Science GA HN328 UT WOS:A1992HN32800044 ER PT J AU LILLARD, RS MORAN, PJ ISAACS, HS AF LILLARD, RS MORAN, PJ ISAACS, HS TI A NOVEL METHOD FOR GENERATING QUANTITATIVE LOCAL ELECTROCHEMICAL IMPEDANCE SPECTROSCOPY SO JOURNAL OF THE ELECTROCHEMICAL SOCIETY LA English DT Article ID VIBRATING ELECTRODE TECHNIQUE; CORROSION; ALUMINUM; STEEL AB A local electrochemical impedance spectroscopy (LEIS) technique for mapping the ac impedance distribution, as a function of frequency, of an electrode has been developed. In LEIS, as in traditional ac impedance methods, a sinusoidal voltage perturbation between the working and reference electrode is maintained by driving an ac current between the working electrode and a distant counterelectrode with a potentiostat. Local ac impedances are then derived from the ratio of the applied ac voltage and the local ac solution current density. The local ac current density is obtained from potential difference measurements near the electrode surface using a probe consisting of two micro-electrodes. By measuring the ac potential difference between the micro-electrodes, and knowing their separation distance and the solution conductivity, the local ac solution current density is derived. The accuracy of the local ac impedance data generated with this technique was established by investigating two model systems. The first provided a homogeneous electrode which allowed LEIS measurements to be compared to traditional EIS, while the second system provided a heterogeneity of known size and location whose components were easily characterized with traditional techniques. It is shown that area-normalized scanning ac impedance measurements of the homogeneous electrode agreed well with traditional results. In addition, because LEIS maps the impedance properties of an electrode, the defect in the heterogeneous electrode was easily detected, while traditional ac impedance of this electrode gave little indication of its presence. C1 USN ACAD,DEPT MECH ENGN,ANNAPOLIS,MD 21402. BROOKHAVEN NATL LAB,DEPT APPL SCI,UPTON,NY 11973. RP LILLARD, RS (reprint author), JOHNS HOPKINS UNIV,DEPT MAT SCI & ENGN,BALTIMORE,MD 21218, USA. NR 24 TC 116 Z9 118 U1 1 U2 23 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 1992 VL 139 IS 4 BP 1007 EP 1012 DI 10.1149/1.2069332 PG 6 WC Electrochemistry; Materials Science, Coatings & Films SC Electrochemistry; Materials Science GA HN522 UT WOS:A1992HN52200016 ER PT J AU TSENG, W PELLEGRINO, J KIM, J THURBER, R COMAS, J PAPANICOLOU, N PROKES, S AF TSENG, W PELLEGRINO, J KIM, J THURBER, R COMAS, J PAPANICOLOU, N PROKES, S TI REDUCTION OF DX CENTERS IN SUPERLATTICE ALLOY-LIKE MATERIAL HIGH ELECTRON-MOBILITY TRANSISTORS SO JOURNAL OF THE ELECTROCHEMICAL SOCIETY LA English DT Article ID QUANTIZED HALL RESISTANCE; PERSISTENT PHOTOCONDUCTIVITY; DOPED ALXGA1-XAS; GAAS; SI; SILICON; LAYERS; MODEL; MBE AB The substitution of selectively Si-doped short-period (4 by 2 and 2 by 1 monolayer(s)) GaAs/AlAs superlattice alloy-like material (SLAM) for Si-doped AlGaAs layers in conventional high electron mobility transistor (HEMT) structures has been demonstrated. Such a short period SLAM HEMT still preserves its field effect transistor characteristics as compared with the conventional HEMT. The shifts of threshold voltages and amounts of DX centers were found to depend on the layer thickness of the superlattices and the positions of Si-dopants within the GaAs layers. C1 USN,RES LAB,WASHINGTON,DC 20375. RP TSENG, W (reprint author), NATL INST STAND & TECHNOL,GAITHERSBURG,MD 20899, USA. NR 16 TC 2 Z9 2 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 1992 VL 139 IS 4 BP 1219 EP 1222 DI 10.1149/1.2069371 PG 4 WC Electrochemistry; Materials Science, Coatings & Films SC Electrochemistry; Materials Science GA HN522 UT WOS:A1992HN52200054 ER PT J AU DUIGNAN, MT FELDMAN, BJ WHITNEY, WT AF DUIGNAN, MT FELDMAN, BJ WHITNEY, WT TI THRESHOLD REDUCTION FOR STIMULATED BRILLOUIN-SCATTERING USING A MULTIPASS HERRIOTT CELL SO JOURNAL OF THE OPTICAL SOCIETY OF AMERICA B-OPTICAL PHYSICS LA English DT Article ID PHASE CONJUGATION; OPTICAL FEEDBACK; RAMAN LASER; PUMP LASER; RADIATION; FIBER; GAIN AB We present an analysis of stimulated Brillouin scattering (SBS) threshold reduction through periodic refocusing of the pump laser within the Brillouin medium. The maximum achievable threshold-reduction factor is limited to approximately 0.85/(1 - T), where T is the transmission between foci. We also analyze SBS gain in a multifocus system for a pump consisting of two narrow-band modes. If OMEGA is the angular frequency of the mode spacing, maximum gain will result from a periodic focal spacing of integral multiples of pi-c/OMEGA, i.e., one half the laser coherence length. We show that a Herriott cell, a two-mirror system capable of periodically refocusing a beam in a relatively small volume, is a convenient device for producing multiple foci for this application. We present results of experiments designed to measure spontaneous SBS threshold with as many as 24 sequential foci in high-pressure xenon. A pulsed hydrogen fluoride chemical laser, operating at 2.910-mu-m on mainly two adjacent axial modes, was used as the pump. The ratios of the measured thresholds compared with that for a single focus are in reasonable agreement with those expected from the theory developed. Finally, we demonstrate that the Herriott cell is capable of high-fidelity optical phase conjugation, providing good reflectivity and correction of added phase aberrations under conditions in which the aberrated pump power is below SBS threshold for a single focus. C1 USN,RES LAB,LASER PHYS BRANCH,WASHINGTON,DC 20375. RP DUIGNAN, MT (reprint author), POTOMAC PHOTON INC,4720-E BOSTON WAY,LANHAM,MD 20706, USA. NR 28 TC 8 Z9 9 U1 0 U2 7 PU OPTICAL SOC AMER PI WASHINGTON PA 2010 MASSACHUSETTS AVE NW, WASHINGTON, DC 20036 SN 0740-3224 J9 J OPT SOC AM B JI J. Opt. Soc. Am. B-Opt. Phys. PD APR PY 1992 VL 9 IS 4 BP 548 EP 559 DI 10.1364/JOSAB.9.000548 PG 12 WC Optics SC Optics GA HM686 UT WOS:A1992HM68600010 ER PT J AU MINER, SM FLACK, RD ALLAIRE, PE AF MINER, SM FLACK, RD ALLAIRE, PE TI 2-DIMENSIONAL FLOW-ANALYSIS OF A LABORATORY CENTRIFUGAL PUMP SO JOURNAL OF TURBOMACHINERY-TRANSACTIONS OF THE ASME LA English DT Article AB Two-dimensional potential flow was used to determine the velocity field within a laboratory centrifugal pump. In particular, the finite element technique was used to model the impeller and volute simultaneously. The rotation of the impeller within the volute was simulated by using steady-state solutions with the impeller in ten different angular orientations. This allowed the interaction between the impeller and the volute to develop naturally as a result of the solution. The results for the complete pump model showed that there are circumferential asymmetries in the velocity field, even at the design flow rate. Differences in the relative velocity components were as large as 0.12 m/s for the radial component and 0.38 m/s for the tangential component, at the impeller exit. The magnitude of these variations was roughly 25 percent of the magnitude of the average radial and tangential velocities at the impeller exit. These asymmetries were even more pronounced at off-design flow rates. The velocity field was also used to determine the location of the tongue stagnation point and to calculate the slip within the impeller. The stagnation point moved from the discharge side of the tongue to the impeller side of the tongue, as the flow rate increased from below design flow to above design flow. At design flow, values of slip ranged from 0.96 to 0.71, from impeller inlet to impeller exit. For all three types of data (velocity profiles, stagnation point location, and slip factor) comparison was made to laser velocimeter data, taken for the same pump. At the design flow, the computational and experimental results agreed to within 17 percent for the velocity magnitude, and 2 deg for the flow angle. The stagnation point locations coincided for the computational and experimental results, and the values for slip agreed to within 10 percent. C1 UNIV VIRGINIA,DEPT MECH & AEROSP ENGN,CHARLOTTESVILLE,VA 22901. RP MINER, SM (reprint author), USN ACAD,ANNAPOLIS,MD 21402, USA. NR 19 TC 18 Z9 18 U1 0 U2 2 PU ASME-AMER SOC MECHANICAL ENG PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 SN 0889-504X J9 J TURBOMACH JI J. Turbomach.-Trans. ASME PD APR PY 1992 VL 114 IS 2 BP 333 EP 339 DI 10.1115/1.2929147 PG 7 WC Engineering, Mechanical SC Engineering GA HR907 UT WOS:A1992HR90700008 ER PT J AU BEAUDOIN, RJ MINER, SM FLACK, RD AF BEAUDOIN, RJ MINER, SM FLACK, RD TI LASER VELOCIMETER MEASUREMENTS IN A CENTRIFUGAL PUMP WITH A SYNCHRONOUSLY ORBITING IMPELLER SO JOURNAL OF TURBOMACHINERY-TRANSACTIONS OF THE ASME LA English DT Article AB Velocity profiles were measured in the impeller of a centrifugal pump with a two-directional laser velocimeter. Blade-to-blade profiles were measured at four circumferential positions and four radii within and one outside the four-bladed impeller. Data are presented herein at two circumferential and three radial locations. The pump was tested in two configurations; with the impeller running centered within the pump, and with the impeller orbiting with a synchronous motion (epsilon/r2 = 0.016). Variation in velocity profiles among the individual passages in the orbiting impeller were found. At design flow rate, these variations ranged from 30 to 60 percent for the radial component, and 15 to 25 percent for the tangential component. Tangenitial velocity profiles near the impeller exit (r/r2 = 0.973) were near uniform across each individual passage. Differences in the magnitude of the exit tangential velocities among the passages however, were detected. Systematic differences in the velocity profile shapes of the centered and orbiting impellers were in general not measured, the only exception being at r/r2 = 0.973 at 40 percent of the design flow rate. At this condition, two distinct radial velocity profiles were measured. Two of the impeller passages of the orbiting impeller contained a recirculation region covering 20-30 percent of the blade passage while the other two passages contained no recirculation region. The centered impeller also contained this region of reverse flow. Finally, velocity data were numerically integrated to find the forces and stiffnesses due to momentum fluxes on the impeller for the orbiting condition. C1 USN ACAD,ANNAPOLIS,MD 21402. UNIV VIRGINIA,DEPT MECH & AEROSP ENGN,CHARLOTTESVILLE,VA 22901. RP BEAUDOIN, RJ (reprint author), GE,SCHENECTADY,NY 12345, USA. NR 20 TC 3 Z9 3 U1 0 U2 0 PU ASME-AMER SOC MECHANICAL ENG PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 SN 0889-504X J9 J TURBOMACH JI J. Turbomach.-Trans. ASME PD APR PY 1992 VL 114 IS 2 BP 340 EP 349 DI 10.1115/1.2929148 PG 10 WC Engineering, Mechanical SC Engineering GA HR907 UT WOS:A1992HR90700009 ER PT J AU FLACK, RD MINER, SM BEAUDOIN, RJ AF FLACK, RD MINER, SM BEAUDOIN, RJ TI TURBULENCE MEASUREMENTS IN A CENTRIFUGAL PUMP WITH A SYNCHRONOUSLY ORBITING IMPELLER SO JOURNAL OF TURBOMACHINERY-TRANSACTIONS OF THE ASME LA English DT Article AB Turbulence profiles were measured in a centrifugal pump with an impeller with backswept blades using a two-directional laser velocimeter. Data presented include radial, tangential, and cross product Reynolds stresses. Blade-to-blade profiles were measured at four circumferential positions and four radii within and one radius outside the four-bladed impelier. The pump was tested in two configurations: with the impeller running centered within the volute, and with the impeller orbiting with a synchronous motion (epsilon/r2 = 0.016). Flow rates ranged from 40 to 106 percent of the design flow rate. Variation in profiles among the individual passages in the oribiting impeller were found. For several regions the turbulence was isotropic so that the cross product Reynolds stress was low. At low flow rates the highest cross product Reynolds stress was near the exit. At near-design conditions the lowest cross product stress was near the exit, where uniform flow was also observed. Also, near the exit of the impeller the highest turbulence levels were seen near the tongue. For the design flow rate, inlet turbulence intensities were typically 9 percent and exit turbulence intensities were 6 percent. For 40 percent flow capacity the values increased to 18 and 19 percent, respectively. Large local turbulence intensities correlated with separated regions. The synchronous orbit did not increase the random turbulence, but did affect the turbulence in the individual channels in a systematic pattern. C1 USN ACAD,ANNAPOLIS,MD 21402. GE,SCHENECTADY,NY 12345. RP FLACK, RD (reprint author), UNIV VIRGINIA,DEPT MECH & AEROSP ENGN,CHARLOTTESVILLE,VA 22901, USA. NR 27 TC 7 Z9 7 U1 0 U2 0 PU ASME-AMER SOC MECHANICAL ENG PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 SN 0889-504X J9 J TURBOMACH JI J. Turbomach.-Trans. ASME PD APR PY 1992 VL 114 IS 2 BP 350 EP 359 DI 10.1115/1.2929149 PG 10 WC Engineering, Mechanical SC Engineering GA HR907 UT WOS:A1992HR90700010 ER PT J AU LINDNER, E ARIAS, E AF LINDNER, E ARIAS, E TI SURFACE FREE-ENERGY CHARACTERISTICS OF POLYFLUORINATED SILANE FILMS SO LANGMUIR LA English DT Article ID OLEOPHOBIC MIXED MONOLAYERS; ORGANIZED MONOLAYERS; SOLID-SURFACES; ADSORPTION; SERIES AB A homologous series of [(perfluoroalkyl)ethyl]silane films was produced on glass and on fused quartz by spontaneous formation from solutions of the corresponding trichlorisilanes. The low energy of the film surfaces of the higher homologues indicates that the silane molecules are closely packed and highly oriented perpendicular to the surface, exposing mainly the -CF3 groups on the surface. The surface energy of the films is a function of the length of the perflurinated chain of the molecules. The surface energy is near a minimum of about 11 dyn/cm with a perfluorinated chain of four carbon atoms, decreasing only slightly with longer chains. There was no significant difference in surface energy between films formed on glass or on quartz. The surface energy of the films did not change upon exposure to water, which indicates that neither deterioration nor reversal of the orientation of the molecules took place. RP LINDNER, E (reprint author), USN COMMAND,CTR CONTROL & OCEAN SURVEILLANCE,RDT&E DIV,CODE 521,SAN DIEGO,CA 92152, USA. NR 32 TC 23 Z9 25 U1 1 U2 8 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0743-7463 J9 LANGMUIR JI Langmuir PD APR PY 1992 VL 8 IS 4 BP 1195 EP 1198 DI 10.1021/la00040a029 PG 4 WC Chemistry, Multidisciplinary; Chemistry, Physical; Materials Science, Multidisciplinary SC Chemistry; Materials Science GA HP262 UT WOS:A1992HP26200029 ER PT J AU LAPOTA, D ROSENBERGER, DE LIEBERMAN, SH AF LAPOTA, D ROSENBERGER, DE LIEBERMAN, SH TI PLANKTONIC BIOLUMINESCENCE IN THE PACK ICE AND THE MARGINAL ICE-ZONE OF THE BEAUFORT SEA SO MARINE BIOLOGY LA English DT Article AB An icebreaker cruise into the Beaufort Sea in the fall of 1986 provided a unique opportunity for studying planktonic bioluminescence in ice fields and in the marginal ice zone. Bathyphotometer casts (bioluminescence intensity, seawater temperature, beam attenuation coefficient, and salinity) and biological collections were made to a depth of 100 m. A light budget, which describes the planktonic species responsible for the measured bioluminescence, and a dinoflagellate species budget were constructed from the mean light output from luminescent plankton and plankton counts. The vertical distribution of bioluminescence among the ice stations was similar. The maximum intensities were 2 to 8 x 10(6) photons s-1 cm-3 in the upper 50 m of the sea-ice interface. The marginal ice zone station (MIZ) exhibited a maximum intensity of 2 to 3 x 10(8) photons s-1 cm-3 between 5 and 30 m depth. At Ice Station 2, Metridia longa and their nauplii contributed approximately 80% of stimulable bioluminescence in the upper 10 m but, overall, Protoperidinium spp. dinoflagellates contributed most of the light to a depth of 100 m. In the MIZ, Protoperidinium spp. dinoflagellates contributed approximately 90% of the light within the upper 10 m, decreasing to 43% of the contributed light at a depth of 40 m. Below 40 m, dinoflagellate bioluminescence decreased to a few percent of the total to a depth of 90 m. Metridia spp. copepods contributed more than 50% of the light at depths from 40 to 90 m. Ostracods, larvaceans, and euphausiid furcilia contributed < 1 % of all bioluminescence at all depths sampled. Correlation analyses between measured bioluminescence (photons s-1 cm-3), the number of bioluminescent dinoflagellates and the light budget for the MIZ indicated highly significant associations: r = 0.919, p = 0.001, and r = 0.912, p < 0.001, respectively (Student's two-tailed t-tests). Bioluminescence was negatively correlated with seawater salinity at all stations (p = 0.001). Maximum bioluminescence was measured in the less saline surface waters at all stations. C1 COMP SCI CORP,SAN DIEGO,CA 92110. RP LAPOTA, D (reprint author), USN,CTR OCEAN SYST,MARINE ENVIRONM BRANCH,CODE 522,SAN DIEGO,CA 92152, USA. NR 38 TC 17 Z9 17 U1 0 U2 12 PU SPRINGER VERLAG PI NEW YORK PA 175 FIFTH AVE, NEW YORK, NY 10010 SN 0025-3162 J9 MAR BIOL JI Mar. Biol. PD APR PY 1992 VL 112 IS 4 BP 665 EP 675 DI 10.1007/BF00346185 PG 11 WC Marine & Freshwater Biology SC Marine & Freshwater Biology GA HR306 UT WOS:A1992HR30600017 ER PT J AU DAWSON, WW SCHROEDER, JP DAWSON, JC NACHTIGALL, PE AF DAWSON, WW SCHROEDER, JP DAWSON, JC NACHTIGALL, PE TI CYCLIC OCULAR HYPERTENSION IN CETACEANS SO MARINE MAMMAL SCIENCE LA English DT Article DE TURSIOPS-TRUNCATUS; BOTTLE-NOSED DOLPHIN; GRAMPUS-GRISEUS; RISSO DOLPHIN; INTRAOCULAR PRESSURE; IOP; CETACEAN; EYE ID INTRAOCULAR-PRESSURE; POPULATION AB In the laboratory, intraocular pressure (IOP) was measured in each eye of two adult Tursiops truncatus and one Grampus griseus. Measures were made in alternation between eyes over a time span. Means and standard deviations were calculated. Mean IOP's ranged from 33.4 mm Hg (SD = 2.4) in the male Tursiops to 24.6 (SD = 2.3) in the female Tursiops. IOP in the Grampus was intermediate. Tonograph functions for the Tursiops over periods greater than 25 min had a cyclic character with maxima and minima. These cycles were fitted with a polynomial function with periods of 15 min (female) and 20 to 26 min (male). There was no significant correlation of the IOP variations with time between eyes in either Tursiops. Compared to humans, these cetaceans exhibit clinical ocular hypertension bilaterally. The range of pressures they exhibit, over time, is much greater than reported previously for several terrestrial mammals. C1 UNIV FLORIDA,DEPT PHYSIOL,GAINESVILLE,FL 32610. USN,CTR OCEAN SYST,HAWAII LAB,KAILUA,HI 96734. UNIV FLORIDA,STUDENT HLTH CARE SERV,GAINESVILLE,FL 32610. RP DAWSON, WW (reprint author), UNIV FLORIDA,COLL MED,DEPT OPHTHALMOL,GAINESVILLE,FL 32610, USA. NR 14 TC 3 Z9 4 U1 0 U2 2 PU SOC MARINE MAMMALOGY PI LAWRENCE PA 1041 NEW HAMPSHIRE ST, LAWRENCE, KS 66044 SN 0824-0469 J9 MAR MAMMAL SCI JI Mar. Mamm. Sci. PD APR PY 1992 VL 8 IS 2 BP 135 EP 142 DI 10.1111/j.1748-7692.1992.tb00372.x PG 8 WC Marine & Freshwater Biology; Zoology SC Marine & Freshwater Biology; Zoology GA HR283 UT WOS:A1992HR28300004 ER PT J AU NEMARICH, CP WHITESEL, HK SARKADY, A AF NEMARICH, CP WHITESEL, HK SARKADY, A TI ONLINE WEAR-PARTICLE MONITORING BASED ON ULTRASONIC-DETECTION AND DISCRIMINATION SO MATERIALS EVALUATION LA English DT Article DE ACOUSTICS; AUTOMOTIVE ENGINEERING; LUBRICANT INSPECTION; NONDESTRUCTIVE EVALUATION; NONDESTRUCTIVE EXAMINATION; OIL ANALYSIS; OIL CONTENT ANALYSIS; OIL DEBRIS MONITORING; SIGNAL PROCESSING; TRIBOLOGY; ULTRASONIC TESTING; WEAR-PARTICLE COUNTING ID SCATTERING AB The authors have developed an ultrasonic technique for the nondestructive evaluation of shipboard machinery conditions. The ultrasonic wear-particle sensor (UWPS) quantitatively measures the amount and size of wear-generated debris in the machinery lubricating oil by employing wide-band, ultrasonic pulse-echo techniques. In addition to its present capability of detecting, counting, and sizing wear debris over a broad range of sizes, several methods of electronically discriminating contaminant particles and air bubbles have been demonstrated experimentally. The UWPS currently exists as a microprocessor-controlled laboratory instrument. An earlier version of the UWPS successfully detected and counted wear particulate generated by oil-lubricated, rolling-element bearings in several bearing-failure tests. The instrument used in these tests did not discriminate between air bubbles and wear debris but was successful in detecting abnormal bearing wear. Three methods have been investigated which may ultimately provide the instrument with the ability to identify scatterers as either air bubbles, water droplets, or debris particulate. One method uses the intensity vs. the angle of scatter of the ultrasonic pulse to discriminate between air and debris. Another method is based upon phase measurements of the reflected pulse echo. The latest method investigated measures the spectra of the individual pulse echoes and correlates the spectral features with particle composition. This report discusses the theory of operation of the UWPS, methods used for determining the size of individual scatterers, and the various methods of discriminating wear debris from entrained air. Test data are presented, and possible applications are discussed. It is felt that this instrument will be a powerful tool for nondestructively determining the wear condition of hydraulic and lubricating-oil machinery. C1 USN ACAD,DEPT ELECT ENGN,ANNAPOLIS,MD 21402. RP NEMARICH, CP (reprint author), USN,DAVID TAYLOR RES CTR,ANNAPOLIS,MD 21402, USA. NR 19 TC 1 Z9 1 U1 0 U2 0 PU AMER SOC NON-DESTRUCTIVE TEST PI COLUMBUS PA 1711 ARLINGATE LANE PO BOX 28518, COLUMBUS, OH 43228-0518 SN 0025-5327 J9 MATER EVAL JI Mater. Eval. PD APR PY 1992 VL 50 IS 4 BP 525 EP 530 PG 6 WC Materials Science, Characterization & Testing SC Materials Science GA HP875 UT WOS:A1992HP87500008 ER PT J AU SAWKA, MN YOUNG, AJ PANDOLF, KB DENNIS, RC VALERI, CR AF SAWKA, MN YOUNG, AJ PANDOLF, KB DENNIS, RC VALERI, CR TI ERYTHROCYTE, PLASMA, AND BLOOD-VOLUME OF HEALTHY-YOUNG MEN SO MEDICINE AND SCIENCE IN SPORTS AND EXERCISE LA English DT Article DE AEROBIC FITNESS; F-CELL RATIO; HEMATOLOGICAL VOLUMES; LEAN BODY MASS; NORMATIVE DATA; SURFACE AREA; TOTAL BLOOD VOLUME; VASCULAR FLUID VOLUMES ID EXERCISE; MUSCLE AB Insufficient data are readily available concerning the vascular fluid volumes of healthy young men. The primary purpose of this study was to develop a normative database for the erythrocyte volume, plasma volume, and blood volume of healthy young men. The secondary purposes were to relate these vascular fluid volumes to the person's body size and physical fitness level and to develop equations that enable their prediction. Fifty-one male soldiers with a mean age of 22 (range 18-35) yr and with a mean maximal aerobic power of 53 (range 42-65) ml O2.kg-1.min-1 had their lean body mass and vascular fluid volumes measured. Erythrocyte volume was measured by Cr-51, and plasma volume was measured by I-125. The findings concerning the erythrocyte volume, plasma volume, and blood volume of these young men are summarized as follows: 1) these vascular fluid volumes are accurately predicted from several indices of body size; 2) lean body mass is the anthropometric index that is most closely correlated to these vascular fluid volumes; 3) the erythrocyte volumes for a given body surface area are lower, particularly for large individuals, than values previously reported in surveys of undefined populations; 4) aerobic fitness is generally not related to vascular volumes; and 5) F-cell ratio is not related to aerobic fitness. C1 BOSTON UNIV,SCH MED,USN,BLOOD RES LAB,BOSTON,MA 02110. RP SAWKA, MN (reprint author), USA,ENVIRONM MED RES INST,DIV THERMAL PHYSIOL & MED,NATICK,MA 01760, USA. NR 34 TC 67 Z9 67 U1 0 U2 5 PU WILLIAMS & WILKINS PI BALTIMORE PA 351 WEST CAMDEN ST, BALTIMORE, MD 21201-2436 SN 0195-9131 J9 MED SCI SPORT EXER JI Med. Sci. Sports Exerc. PD APR PY 1992 VL 24 IS 4 BP 447 EP 453 PG 7 WC Sport Sciences SC Sport Sciences GA HN931 UT WOS:A1992HN93100010 PM 1560741 ER PT J AU MUNTER, DW AF MUNTER, DW TI DIAGNOSING SUBARACHNOID HEMORRHAGE IN THE ED SO MILITARY MEDICINE LA English DT Letter RP MUNTER, DW (reprint author), USN HOSP,DEPT EMERGENCY MED,DIV EDUC,PORTSMOUTH,VA, 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 APR PY 1992 VL 157 IS 4 BP A5 EP A5 PG 1 WC Medicine, General & Internal SC General & Internal Medicine GA HN354 UT WOS:A1992HN35400001 PM 1620371 ER PT J AU CARR, LE ELSBERRY, RL AF CARR, LE ELSBERRY, RL TI ANALYTICAL TROPICAL CYCLONE ASYMMETRIC CIRCULATION FOR BAROTROPIC MODEL INITIAL CONDITIONS SO MONTHLY WEATHER REVIEW LA English DT Note ID MOTION; FLOW AB The flow field around a tropical cyclone can be decomposed into the symmetric vortex, an environmental steering flow, and an asymmetric circulation that is the residual after the first two components are removed. In a barotropic model with a quiescent environment, the asymmetric circulation is associated with a propagation vector that is defined to be the difference between the storm-motion vector and the steering flow. An analytical specification derived by Carr for the asymmetric circulation and the corresponding propagation vector is proposed for use in the initial conditions of dynamical track-prediction models. One widely used method for estimating the environmental steering flow has been to average the wind components in radial bands centered on the storm position. It is shown that the portion of the asymmetric circulation that is included within these radial band averages results in a systematic rotation of the propagation vectors defined relative to the steering flow, which is quite similar to that calculated by compositing observations. Thus, some method other than the radial band-average estimate of the steering will be required in the wind-field decomposition to separate the large-scale environment from the influence of the tropical cyclone. It is demonstrated that inclusion of the analytically generated asymmetric circulation in the initial conditions of a barotropic track-prediction model leads to a propagation vector with the correct speed and direction. It is proposed that inclusion of the asymmetric circulation would eliminate much of the initial slow bias in dynamical track-prediction models that include only the symmetric vortex circulation and thus improve the tropical cyclone track forecasts. C1 USN,POSTGRAD SCH,DEPT METEOROL,CODE MR-ES,MONTEREY,CA 93940. NR 17 TC 16 Z9 16 U1 0 U2 1 PU AMER METEOROLOGICAL SOC PI BOSTON PA 45 BEACON ST, BOSTON, MA 02108-3693 SN 0027-0644 J9 MON WEATHER REV JI Mon. Weather Rev. PD APR PY 1992 VL 120 IS 4 BP 644 EP 652 DI 10.1175/1520-0493(1992)120<0644:ATCACF>2.0.CO;2 PG 9 WC Meteorology & Atmospheric Sciences SC Meteorology & Atmospheric Sciences GA HK879 UT WOS:A1992HK87900010 ER PT J AU SYMONDS, CL AF SYMONDS, CL TI WAR ON THE GREAT-LAKES - COMMEMORATING THE 175TH-ANNIVERSARY OF THE BATTLE-OF-LAKE-ERIE - WELSH,WJ, SKAGGS,DC SO NEW YORK HISTORY LA English DT Book Review RP SYMONDS, CL (reprint author), USN ACAD,DEPT HIST,ANNAPOLIS,MD 21402, USA. NR 1 TC 0 Z9 0 U1 0 U2 0 PU NEW YORK STATE HIST ASSN PI COOPERSTOWN PA PO BOX 800, COOPERSTOWN, NY 13326-0800 SN 0146-437X J9 NEW YORK HIST JI N. Y. Hist. PD APR PY 1992 VL 73 IS 2 BP 228 EP 230 PG 3 WC History SC History GA JK465 UT WOS:A1992JK46500014 ER PT J AU WOOD, KS VANVECHTEN, D AF WOOD, KS VANVECHTEN, D TI SUPERCONDUCTING DETECTORS FOR PHOTON AND PARTICLE SPECTROSCOPY - CRITERIA FOR TRANSITIONS TO NORMAL STATE SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article ID HCP METALS AB The nonequilibrium state produced when a high energy (> 1 keV) quanta interacts with a superconducting solid is the physical basis for many new detectors. The most common approaches magnetically monitor the phase of small "grains" (SGDs) or monitor transients in the quasiparticle tunneling current in voltage-biased Josephson junctions (TJDs). While the former requires transitions to the normal state for its signal, the latter's energy resolution is degraded by excursions in the order parameter. To facilitate detector design, this article quantifies how the choices of sample material, bath temperature and field bias combine to influence the magnitude and spatial extent of the thermal excursion. Extensive tables of materials parameters are included. A wide range of inherent effects including the magnetic field dependent latent heat of the transition are discussed in the context of the limitations they produce on the operating energy range and size of proposed SGD detectors. Superheated initial conditions are not considered because the need for automatic resetting in astrophysical X-ray spectroscopy. Of the 23 elemental superconductors, we show that as SGDs only 5 have maximum grain sizes larger than 10-mu-m and only 3 are usable for photons with energies above 100 keV. Alpha particle detectors will he restricted by conceptually equivalent physics. Only by using inhomogeneous initial states or local. rather than global, transitions may these restrictions on bolometric detectors be lessened. RP WOOD, KS (reprint author), USN,RES LAB,EO HULBURT CTR SPACE RES,WASHINGTON,DC 20375, USA. NR 39 TC 12 Z9 12 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 APR 1 PY 1992 VL 314 IS 1 BP 86 EP 112 DI 10.1016/0168-9002(92)90502-U PG 27 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA HQ297 UT WOS:A1992HQ29700011 ER PT J AU MCMORROW, D CAMPBELL, AB KNUDSON, AR BUCHNER, S WEATHERFORD, TR AF MCMORROW, D CAMPBELL, AB KNUDSON, AR BUCHNER, S WEATHERFORD, TR TI TRANSIENT CHARGE COLLECTION FROM ION TRACKS IN SEMICONDUCTORS SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS LA English DT Article; Proceedings Paper CT 14TH INTERNATIONAL CONF ON ATOMIC COLLISIONS IN SOLIDS ( ICACIS-14 ) CY JUL 28-AUG 02, 1991 CL UNIV SALFORD, SALFORD, ENGLAND SP UNIV SALFORD, CITY SALFORD, BRIT AEROSP, B & P ENGN, ELSEVIER PUBL, FARMER NORTON INT, MANCHESTER INT AIRPORT, MARKEM SYST, VACUUM 91 CONF EXHIBIT, VERTEC HO UNIV SALFORD ID GAAS-MESFETS; FETS AB Ion-induced charge-collection transients spanning nine orders of magnitude in time resolution are presented for 1.2 and 0.1-mu-m gate length GaAs MESFETs. Measurements as a function of device bias and temperature reveal the presence of several different contributions to the charge-collection transients, ranging in time scale from picoseconds to milliseconds. The dominant charge-collection contributions at longer (> 1 ns) times are associated with trapped charge effects which modulate the channel regions of these devices. For most devices investigated, such effects account for the major fraction of collected charge, and dominate the transients detected for the 0.1-mu-m MBE grown devices. The significance of charge trapping effects in the SEU sensitivity of GaAs circuits is suggested and discussed. C1 MARTIN MARIETTA CORP LABS,BALTIMORE,MD 21227. SACHS FREEMAN ASSOCIATES INC,LANDOVER,MD 20785. RP MCMORROW, D (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 21 TC 4 Z9 4 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-583X J9 NUCL INSTRUM METH B JI Nucl. Instrum. Methods Phys. Res. Sect. B-Beam Interact. Mater. Atoms PD APR PY 1992 VL 67 IS 1-4 BP 384 EP 389 DI 10.1016/0168-583X(92)95837-H PG 6 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Atomic, Molecular & Chemical; Physics, Nuclear SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA HR308 UT WOS:A1992HR30800080 ER PT J AU SCHWIRZKE, F HALLAL, MP MARUYAMA, XK AF SCHWIRZKE, F HALLAL, MP MARUYAMA, XK TI ION FORMATION ON THE SURFACES OF ELECTRODES SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS LA English DT Article; Proceedings Paper CT 14TH INTERNATIONAL CONF ON ATOMIC COLLISIONS IN SOLIDS ( ICACIS-14 ) CY JUL 28-AUG 02, 1991 CL UNIV SALFORD, SALFORD, ENGLAND SP UNIV SALFORD, CITY SALFORD, BRIT AEROSP, B & P ENGN, ELSEVIER PUBL, FARMER NORTON INT, MANCHESTER INT AIRPORT, MARKEM SYST, VACUUM 91 CONF EXHIBIT, VERTEC HO UNIV SALFORD ID EMISSION AB The initial phase of the onset of electrical breakdown in a vacuum discharge is characterized by very rapid ionization of surface material which leads to a kind of "explosive" plasma formation on the electrodes. As an increasing electric field is applied between the two electrodes of a vacuum diode the ionization process is initiated by the field emission of electrons from highly localized spots on the cathode surface. Despite the fundamental importance of cathode spots for the breakdown process, the structure of cathode spots and the fast ionization rates of surface layers were not fully understood. Besides the Joule heating of the field emitting spot, the electrons also desorb contaminants and ionize some of the released neutrals. Ions produced a short distance (approximately 1-mu-m) from the spot are accelerated back towards the cathode. This ion bombardment leads to surface heating of the spot and calculations of the power deposition show' that ion surface heating is initially orders of magnitude larger than Joule heating. Ion bombardment is especially important at low initial current densities since it is efficient in producing desorption and sputtering of neutrals from the surface and hence increases the neutral density which in turn increases the ionization rate. As more ions are produced, a positive space charge layer forms which enhances the electric field and thus strongly enhances the field emitted electron current. Surface heating and the buildup of positive space charge rapidly lead to further enhanced field emission and finally thermionic electron emission. The localized buildup of an ion sheath above the electron emitting spot naturally leads to pressure and electric field distributions which provide such a large electron flow and ion sputtering rates that the spot explodes into a dense plasma within a few nanoseconds. RP SCHWIRZKE, F (reprint author), USN,POSTGRAD SCH,MONTEREY,CA 93943, USA. NR 9 TC 3 Z9 3 U1 0 U2 2 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-583X J9 NUCL INSTRUM METH B JI Nucl. Instrum. Methods Phys. Res. Sect. B-Beam Interact. Mater. Atoms PD APR PY 1992 VL 67 IS 1-4 BP 554 EP 559 DI 10.1016/0168-583X(92)95872-O PG 6 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Atomic, Molecular & Chemical; Physics, Nuclear SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA HR308 UT WOS:A1992HR30800115 ER PT J AU SWARTZLANDER, GA AF SWARTZLANDER, GA TI DARK-SOLITON PROTOTYPE DEVICES - ANALYSIS BY USING DIRECT-SCATTERING THEORY SO OPTICS LETTERS LA English DT Article ID PULSES; FIBERS AB Signals encoded as highly stable spatial (or temporal) dark solitons can be used in nonlinear-optical devices such as logic gates, interconnects, multiplexers, and filters. The formation of these waves with the use of simple diffracting (dispersing) elements in prototypical devices is analyzed by using the direct-scattering method, which is also outlined. Noncollisional dark-soliton XOR and AND gates and dark-soliton level splitting and bands are also described. RP SWARTZLANDER, GA (reprint author), USN,RES LAB,LASER PHYS BRANCH,WASHINGTON,DC 20375, USA. OI Swartzlander, Grover/0000-0003-3513-2225 NR 13 TC 30 Z9 31 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 APR 1 PY 1992 VL 17 IS 7 BP 493 EP 495 PG 3 WC Optics SC Optics GA HK744 UT WOS:A1992HK74400011 PM 19794536 ER PT J AU WILLIAMS, GM DUTT, DA RULLER, JA FRIEBELE, EJ AF WILLIAMS, GM DUTT, DA RULLER, JA FRIEBELE, EJ TI PERMANENT PHOTOWRITTEN OPTICAL GRATINGS IN IRRADIATED SILICATE-GLASSES SO OPTICS LETTERS LA English DT Article ID FIBERS AB We show that permanent optical gratings can be photowritten into simple silicate glasses by exposure to interfering beams of an Ar-ion laser after the glass has been treated by x rays. Gratings with index modulations as large as DELTA-n = 10(-5) can be formed in less than a minute by exposure to write beams with intensities of the order of 50 W/cm2. C1 VIRGINIA POLYTECH INST & STATE UNIV,DEPT ELECT ENGN,BLACKSBURG,VA 24061. SFA INC,LANDOVER,MD 20785. RP WILLIAMS, GM (reprint author), USN,RES LAB,DIV OPT SCI,CODE 6505,WASHINGTON,DC 20375, USA. NR 16 TC 6 Z9 6 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 APR 1 PY 1992 VL 17 IS 7 BP 532 EP 534 DI 10.1364/OL.17.000532 PG 3 WC Optics SC Optics GA HK744 UT WOS:A1992HK74400024 PM 19794549 ER PT J AU SIMONSON, LG MCMAHON, KT CHILDERS, DW MORTON, HE AF SIMONSON, LG MCMAHON, KT CHILDERS, DW MORTON, HE TI BACTERIAL SYNERGY OF TREPONEMA-DENTICOLA AND PORPHYROMONAS-GINGIVALIS IN A MULTINATIONAL POPULATION SO ORAL MICROBIOLOGY AND IMMUNOLOGY LA English DT Article DE TREPONEMA-DENTICOLA; PORPHYROMONAS-GINGIVALIS; PERIODONTITIS; SYNERGY; SUBGINGIVAL PLAQUE AB Treponema denticola and Porphyomonas gingivalis have been associated with human adult severe periodontitis. In this study, we quantified these putative pathogens in subgingival plaque samples collected from 74 Fijians, 74 Colombians and 73 U.S. Americans stationed at the Multinational Force and Observers encampment in the Sinai Desert, Egypt. A contingency table of T. denticola and P. gingivalis frequency revealed a highly significant synergistic relationship. We discovered that the occurrence of T. denticola apparently requires the presence of P. gingivalis. This represents the first observation of a synergistic relationship between these putative oral pathogens associated with adult severe periodontal disease. RP SIMONSON, LG (reprint author), USN,INST DENT RES,BLDG 1-H,NTC,GREAT LAKES,IL 60088, USA. NR 0 TC 54 Z9 59 U1 0 U2 2 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 APR PY 1992 VL 7 IS 2 BP 111 EP 112 DI 10.1111/j.1399-302X.1992.tb00519.x PG 2 WC Dentistry, Oral Surgery & Medicine; Immunology; Microbiology SC Dentistry, Oral Surgery & Medicine; Immunology; Microbiology GA HP942 UT WOS:A1992HP94200009 PM 1326739 ER PT J AU KLAFTER, J SHLESINGER, MF ZUMOFEN, G BLUMEN, A AF KLAFTER, J SHLESINGER, MF ZUMOFEN, G BLUMEN, A TI SCALE-INVARIANCE IN ANOMALOUS DIFFUSION SO PHILOSOPHICAL MAGAZINE B-PHYSICS OF CONDENSED MATTER STATISTICAL MECHANICS ELECTRONIC OPTICAL AND MAGNETIC PROPERTIES LA English DT Article ID RANDOM VELOCITY-FIELDS; TIME RANDOM-WALK; LEVY WALKS; ACCELERATED DIFFUSION; JOSEPHSON-JUNCTIONS; CHAOTIC SYSTEMS; TRANSPORT; TURBULENCE; DENSITY; MEDIA AB Transport in disordered systems has been an active topic of research with emphasis on sublinear behaviour in time of the mean square displacement of a random walker. This dispersive transport has been shown to originate from diffusion on scale-invariant fractal structures or to be due to long-time tails in waiting-time distributions which are scale invariant in time. Another type of diffusion, with the mean square displacement being superlinear in time has become of recent interest. We discuss the different diffusional behaviours and compare their propagators. We describe the Levy walk scheme for diffusion in the framework of continuous-time random walks with coupled memories. This type of walk describes random motion in space and time in a scaling fashion and may lead to enhanced diffusion. We focus on some properties of enhanced diffusion in one dimension: the mean square displacement, the propagator and the mean number of distinct sites visited. C1 OFF NAVAL RES, DIV PHYS, ARLINGTON, VA 22217 USA. SWISS FED INST TECHNOL, PHYS CHEM LAB, CH-8092 ZURICH, SWITZERLAND. UNIV FREIBURG, W-7800 FREIBURG, GERMANY. RP TEL AVIV UNIV, SCH CHEM, IL-69978 TEL AVIV, ISRAEL. NR 30 TC 18 Z9 18 U1 0 U2 1 PU TAYLOR & FRANCIS LTD PI ABINGDON PA 2-4 PARK SQUARE, MILTON PARK, ABINGDON OR14 4RN, OXON, ENGLAND SN 0141-8637 J9 PHILOS MAG B JI Philos. Mag. B-Phys. Condens. Matter Stat. Mech. Electron. Opt. Magn. Prop. PD APR PY 1992 VL 65 IS 4 BP 755 EP 765 DI 10.1080/13642819208204915 PG 11 WC Materials Science, Multidisciplinary; Mechanics; Physics, Applied; Physics, Condensed Matter SC Materials Science; Mechanics; Physics GA HN946 UT WOS:A1992HN94600026 ER PT J AU PAPACONSTANTOPOULOS, DA SINGH, DJ AF PAPACONSTANTOPOULOS, DA SINGH, DJ TI TOTAL-ENERGY CALCULATIONS OF SOLID H, LI, NA, K, RB, AND CS - REPLY SO PHYSICAL REVIEW B LA English DT Letter AB Using highly converged local-density-approximation calculations for K and Li, we dispute on physical grounds the claims of the preceding Comment. RP PAPACONSTANTOPOULOS, DA (reprint author), USN,RES LAB,COMPLEX SYST THEORY BRANCH,WASHINGTON,DC 20375, USA. RI Singh, David/I-2416-2012 NR 3 TC 8 Z9 8 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 1992 VL 45 IS 13 BP 7507 EP 7508 DI 10.1103/PhysRevB.45.7507 PG 2 WC Physics, Condensed Matter SC Physics GA HL993 UT WOS:A1992HL99300075 ER PT J AU BURTON, BP OSBURN, JE PASTUREL, A AF BURTON, BP OSBURN, JE PASTUREL, A TI THEORETICAL CALCULATIONS OF THE NIAL-NITI PHASE-DIAGRAM BASED ON 1ST-PRINCIPLES LINEAR-MUFFIN-TIN-ORBITAL AND FULL-POTENTIAL LINEARLY-AUGMENTED PLANE-WAVE COHESIVE-ENERGY CALCULATIONS SO PHYSICAL REVIEW B LA English DT Article ID ALLOYS AB Linear-muffin-tin-orbital and full-potential linearly-augmented plane-wave calculations of cohesive energies were performed for observed and hypothetical ordered structures in the system NiAl-NiTi. Differences in cohesive energies were parametrized in both the Connolly and Williams and epsilon-G approximations, and the resulting effective-cluster interactions were used to calculate theoretical phase diagrams. Long-range "elastic" interactions and short-range effective-cluster interactions are predicted to be causes of the observed immiscibility between B2 and L2(1) phases. C1 USN, RES LAB, COMPLEX SYST THEORY BRANCH, WASHINGTON, DC 20375 USA. ECOLE NATL ELECTROCHIM & ELECTROMET GRENOBLE, THERMODYNAM & PHYSICOCHIM MET LAB, F-38402 ST MARTIN DHERES, FRANCE. RP NATL INST STAND & TECHNOL, MAT SCI & ENGN LAB, GAITHERSBURG, MD 20899 USA. NR 24 TC 24 Z9 24 U1 0 U2 2 PU AMER PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1098-0121 EI 1550-235X J9 PHYS REV B JI Phys. Rev. B PD APR 1 PY 1992 VL 45 IS 14 BP 7677 EP 7683 DI 10.1103/PhysRevB.45.7677 PG 7 WC Physics, Condensed Matter SC Physics GA HN477 UT WOS:A1992HN47700007 ER PT J AU HICKS, JC RUCKENSTEIN, AE SCHMITTRINK, S AF HICKS, JC RUCKENSTEIN, AE SCHMITTRINK, S TI CHARGE FLUCTUATIONS, CHARGE-TRANSFER INSTABILITIES, AND SUPERCONDUCTIVITY IN A 3-BAND MODEL OF CUO2 PLANES SO PHYSICAL REVIEW B LA English DT Note ID HIGH-TEMPERATURE SUPERCONDUCTIVITY; HIGH-TC SUPERCONDUCTIVITY; RESONATING-VALENCE-BOND; HUBBARD-MODEL; MECHANISM AB We apply a recently developed quasiparticle theory for strongly correlated systems to a three-band model of Cu-O planes. We allow for Cu-O hybridization, Cu-O intersite repulsion, and a large on-site repulsion at the Cu sites (which will be treated as infinite). We use the large spin degeneracy (1/N) expansion to study (i) the interplay between charge-transfer instabilities and phase separation in the mean-field (N = infinity limit) phase diagram of this model and (ii) the pairing interactions induced by the charge fluctuations (calculated to leading order in 1/N) in the proximity of these instabilities. C1 RUTGERS STATE UNIV,SERIN PHYS LAB,PISCATAWAY,NJ 08855. UNIV MARBURG,DEPT PHYS,W-3550 MARBURG,GERMANY. UNIV MARBURG,CTR MAT SCI,W-3550 MARBURG,GERMANY. RP HICKS, JC (reprint author), USN,CTR OCEAN SYST,MAT RES BRANCH,CODE 633,SAN DIEGO,CA 92152, USA. NR 14 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 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD APR 1 PY 1992 VL 45 IS 14 BP 8185 EP 8188 DI 10.1103/PhysRevB.45.8185 PG 4 WC Physics, Condensed Matter SC Physics GA HN477 UT WOS:A1992HN47700078 ER PT J AU DUTT, DA HIGBY, PL GRISCOM, DL AF DUTT, DA HIGBY, PL GRISCOM, DL TI A STRUCTURAL MODEL FOR LOW SILICA CONTENT CALCIUM ALUMINOSILICATE GLASSES SO PHYSICS AND CHEMISTRY OF GLASSES LA English DT Article ID ALUMINATE GLASSES; SI-29 AB A new structural model is proposed to explain the maximum in T(g) observed in the 5-15 mol% SiO2 content range of calcium aluminosilicate glasses with low silica contents. A correlation between T(g) and the concentration of O2- determined by electron spin resonance is presented. The experimental results are explained by a structural model based on the calcium aluminosilicate liquidus phase diagram. RP DUTT, DA (reprint author), USN,RES LAB,DIV OPT SCI,WASHINGTON,DC 20375, USA. NR 23 TC 11 Z9 11 U1 0 U2 1 PU SOC GLASS TECHNOLOGY PI SHEFFIELD PA THORNTON 20 HALLAM GATE ROAD, SHEFFIELD, S YORKSHIRE, ENGLAND S10 5BT SN 0031-9090 J9 PHYS CHEM GLASSES JI Phys. Chem. Glasses PD APR PY 1992 VL 33 IS 2 BP 51 EP 55 PG 5 WC Chemistry, Physical; Materials Science, Ceramics SC Chemistry; Materials Science GA HN440 UT WOS:A1992HN44000004 ER PT J AU LIGRANI, PM FINLAY, WH FIELDS, WA FUQUA, SJ SUBRAMANIAN, CS AF LIGRANI, PM FINLAY, WH FIELDS, WA FUQUA, SJ SUBRAMANIAN, CS TI FEATURES OF WAVY VORTICES IN A CURVED CHANNEL FROM EXPERIMENTAL AND NUMERICAL-STUDIES SO PHYSICS OF FLUIDS A-FLUID DYNAMICS LA English DT Article ID FLOW; INSTABILITIES; TRANSITION; ROTATION AB Evidence of time-dependent, wavy vortex motions associated with undulating and twisting Dean vortices is obtained experimentally in a curved channel with 40 to 1 aspect ratio, and mild curvature (radius ratio = 0.979). These results are compared with direct numerical simulations of the time-dependent, three-dimensional Navier-Stokes equations using periodic boundary conditions in the spanwise and streamwise directions. When viewed in cross section, experimental visualizations of undulating and twisting vortex flows show rocking motion and changes in the direction of the flow between vortices that are like those observed in the simulations. Experimental spectra show that undulating vortices are replaced by the higher-frequency, shorter streamwise wavelength twisting vortices at higher Reynolds numbers. When undulating vortices are present, experimental power spectra and visualizations give frequencies that are somewhat lower than the most unstable frequencies predicted by linear stability analysis. When twisting vortices are present, experimental power spectra give fundamental and harmonic frequencies in good agreement with simulated values and with values from linear stability analysis. Twisting is present in experimental spectra over the largest Reynolds number range in spectra measured near the concave wall within inflow regions and near the concave wall near individual vortices. Fundamental amplitudes in these spectra are strongly dependent upon Reynolds number as well as on the location within the vortex pair structure. Twisting is connected to local increases of the longitudinal Reynolds stress. Like twisting, these increases occur first near the concave surface near inflow regions as the Reynolds number increases. Distributions of time-averaged streamwise velocity, streamwise vorticity, radial vorticity, and spanwise vorticity in cross-sectional planes during twisting show good quantitative and qualitative agreement with simulation results. During undulation, time-averaged radial vorticity, spanwise vorticity, and streamwise velocity distributions also compare well. In general, experimental wavy vortices are somewhat less regular than the temporally and spatially periodic wavy vortices observed in the simulations, or in Taylor-Couette flow. C1 UNIV ALBERTA,DEPT MECH ENGN,EDMONTON T6G 2G8,ALBERTA,CANADA. RP LIGRANI, PM (reprint author), USN,POSTGRAD SCH,DEPT MECH ENGN,MONTEREY,CA 93943, USA. OI Subramanian, Chelakara S./0000-0003-4149-2972 NR 22 TC 21 Z9 21 U1 0 U2 1 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0899-8213 J9 PHYS FLUIDS A-FLUID PD APR PY 1992 VL 4 IS 4 BP 695 EP 709 DI 10.1063/1.858289 PG 15 WC Mechanics; Physics, Fluids & Plasmas SC Mechanics; Physics GA HK565 UT WOS:A1992HK56500010 ER PT J AU DEVORE, CR ORAN, ES AF DEVORE, CR ORAN, ES TI THE STABILITY OF IMPLODING DETONATIONS IN THE GEOMETRICAL SHOCK DYNAMICS (CCW) MODEL SO PHYSICS OF FLUIDS A-FLUID DYNAMICS LA English DT Article AB The stability of cylindrically and spherically imploding detonations is examined within the theoretical framework of geometrical shock dynamics. The linearized Chester-Chisnell-Whitham (CCW) equations describing the accelerating detonation wave are solved both analytically and numerically to track the evolution of the distorted wave front. As is the case for the corresponding nonreactive shock problem, for harmonic mode numbers greater than unity the perturbation amplitudes decrease as the implosion proceeds, but not as rapidly as the implosion radius itself. Thus, the detonation is relatively unstable in this model, and indeed is more unstable than the imploding shock of the same initial strength. The latter result is due primarily to the slower acceleration of the detonation wave as it implodes, relative to the nonreactive shock wave. RP DEVORE, CR (reprint author), USN,RES LAB,COMPUTAT PHYS & FLUID DYNAM LAB,WASHINGTON,DC 20375, USA. RI DeVore, C/A-6067-2015 OI DeVore, C/0000-0002-4668-591X NR 15 TC 12 Z9 13 U1 1 U2 3 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0899-8213 J9 PHYS FLUIDS A-FLUID PD APR PY 1992 VL 4 IS 4 BP 835 EP 844 DI 10.1063/1.858300 PG 10 WC Mechanics; Physics, Fluids & Plasmas SC Mechanics; Physics GA HK565 UT WOS:A1992HK56500021 ER PT J AU KARLE, IL FLIPPENANDERSON, JL SUKUMAR, M BALARAM, P AF KARLE, IL FLIPPENANDERSON, JL SUKUMAR, M BALARAM, P TI HELIX PACKING OF LEUCINE-RICH PEPTIDES - A PARALLEL LEUCINE LADDER IN THE STRUCTURE OF BOC-AIB-LEU-AIB-AIB-LEU-LEU-LEU-AIB-LEU-AIB-OME SO PROTEINS-STRUCTURE FUNCTION AND GENETICS LA English DT Article DE X-RAY DIFFRACTION ANALYSIS; HYDROGEN BONDS; PEPTIDE CONFORMATION; 3(10)/ALPHA-HELIX TRANSITION; ANTIPARALLEL HELIX PACKING; LEUCYL-LEUCYL INTERACTION ID ALPHA-AMINOISOBUTYRIC-ACID; CRYSTAL-STRUCTURE; AMINO-ACIDS; PROTEIN; DECAPEPTIDES; ANTIPARALLEL; DESIGN; STEREOCHEMISTRY; AGGREGATION; RESIDUES AB The packing of peptide helices in crystals of the leucine-rich decapeptide Boc-Aib-Leu-Aib-Aib-Leu-Leu-Leu-Aib-Leu-Aib-OMe provides an example of ladder-like leucyl-leucyl interactions between neighboring molecules. The peptide molecule forms a helix with five 5 --> 1 hydrogen bonds and two 4 --> 1 hydrogen bonds near the C terminus. Three head-to-tail NH ... O = C hydrogen bonds between helices form continuous columns of helices in the crystal. The helical columns associate in an antiparallel fashion, except for the association of Leu ... Leu side chains, which occurs along the diagonal of the cell where the peptide helices are parallel. The peptide, with formula C56H102N10O13, crystallizes in space group P2(1)2(1)2(1) with Z = 4 and cell parameters a = 16.774(3) angstrom, b = 20.032(3) angstrom and c = 20.117(3) angstrom; overall agreement factor R = 10.7% for 2014 data with \F(obs)\ > 3-sigma(F); resolution 1.0 angstrom. C1 INDIAN INST SCI,MOLEC BIOPHYS UNIT,BANGALORE 560012,KARNATAKA,INDIA. RP KARLE, IL (reprint author), USN,RES LAB,STRUCT MATTER LAB,WASHINGTON,DC 20375, USA. FU NIGMS NIH HHS [GM30902] NR 30 TC 14 Z9 14 U1 0 U2 3 PU WILEY-LISS PI NEW YORK PA DIV JOHN WILEY & SONS INC 605 THIRD AVE, NEW YORK, NY 10158-0012 SN 0887-3585 J9 PROTEINS JI Proteins PD APR PY 1992 VL 12 IS 4 BP 324 EP 330 DI 10.1002/prot.340120404 PG 7 WC Biochemistry & Molecular Biology; Biophysics SC Biochemistry & Molecular Biology; Biophysics GA HJ852 UT WOS:A1992HJ85200003 PM 1579566 ER PT J AU WEILER, KW JOHNSTON, KJ VANDYK, SD AF WEILER, KW JOHNSTON, KJ VANDYK, SD TI ON THE USE OF SUPERNOVAE AS RADIOOPTICAL ASTROMETRIC FIDUCIAL POINTS SO PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF THE PACIFIC LA English DT Article ID REFERENCE FRAME; EMISSION; POSITIONS; INTERFEROMETRY; CATALOG; STARS AB The high-accuracy radio astrometric reference frame is based on extragalactic radio sources which are optically faint (m(V) > 15), while the most accurate optical astrometric reference frame is made up of bright galactic stars which are almost all radio quiet to current sensitivity limits. The HIPPARCOS mission is establishing positional accuracies for these bright stars at the several milliarcsecond level of precision, and advancements in space-based observations should eventually allow precisions at the submilliarcsecond level. However, the relationship between the two reference frames is difficult to establish directly to a level consistent with the internal precision of the two independent frames. The compact extragalactic radio sources are too faint for most optical astrometric techniques, and the bright stars which are active radio sources are often in binary or extended envelope systems where the radio and optical photocenters may be related at accuracies of only a few milliarcseconds. This difficulty may be alleviated by using the occasional optically and radio bright supernovae as pointlike fiducial marks for establishing relationships between the two reference frames. These independent reference-frame relationships can be accomplished from currently available ground-based platforms. We anticipate about two bright (m(V) less than or similar to 12) supernovae per decade which could serve as useful candidates for combined radio-optical astrometric observations. RP WEILER, KW (reprint author), USN,RES LAB,CTR ADV SPACE SENSING,CODE 4215,WASHINGTON,DC 20375, USA. NR 26 TC 0 Z9 0 U1 0 U2 0 PU ASTRONOMICAL SOC PACIFIC PI SAN FRANCISCO PA 390 ASHTON AVE, SAN FRANCISCO, CA 94112 SN 0004-6280 J9 PUBL ASTRON SOC PAC JI Publ. Astron. Soc. Pac. PD APR PY 1992 VL 104 IS 674 BP 246 EP 250 DI 10.1086/132985 PG 5 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA HQ717 UT WOS:A1992HQ71700003 ER PT J AU LEE, M HODLER, J HAGHIGHI, P RESNICK, D AF LEE, M HODLER, J HAGHIGHI, P RESNICK, D TI BONE EXCRESCENCE AT THE MEDIAL BASE OF THE DISTAL PHALANX OF THE 1ST TOE - NORMAL VARIANT, REACTIVE CHANGE, OR NEOPLASIA SO SKELETAL RADIOLOGY LA English DT Article DE TOE; BONE EXCRESCENCE; DEGENERATIVE CHANGES; HISTOLOGY AB In a review of 157 anteroposterior (AP) foot radiographs in 117 adult and pediatric patients, we observed a medial excrescence on the plantar aspect of the terminal phalanx of the hallux in 88.5% of the feet. Histologic analysis documented the presence of reactive bone. The bony outgrowth appears after closure of the adjacent physeal plate and is rarely symptomatic. Its high prevalence indirectly implies that it is not specific to any particular type of foot. Although certain types of foot may contribute to its development, we believe that repetitive forces occurring during ambulation induce this reactive bone formation. C1 VET AFFAIRS MED CTR,DEPT RADIOL,3350 VILLAGE LA JOLLA DR,SAN DIEGO,CA 92161. VET AFFAIRS MED CTR,DEPT PATHOL,SAN DIEGO,CA. USN HOSP,DEPT ORTHOPED PODIATRY,CAMP PENDLETON,CA. NR 6 TC 3 Z9 3 U1 0 U2 0 PU SPRINGER VERLAG PI NEW YORK PA 175 FIFTH AVE, NEW YORK, NY 10010 SN 0364-2348 J9 SKELETAL RADIOL JI Skeletal Radiol. PD APR PY 1992 VL 21 IS 3 BP 161 EP 165 PG 5 WC Orthopedics; Radiology, Nuclear Medicine & Medical Imaging SC Orthopedics; Radiology, Nuclear Medicine & Medical Imaging GA HQ585 UT WOS:A1992HQ58500003 PM 1604341 ER PT J AU LACIVITA, CJ PIROG, RL AF LACIVITA, CJ PIROG, RL TI IMPLEMENTING THE SHARE ECONOMY SO SOUTHERN ECONOMIC JOURNAL LA English DT Article C1 NATL DEF UNIV,WASHINGTON,DC. RP LACIVITA, CJ (reprint author), USN,POSTGRAD SCH,MONTEREY,CA 93940, USA. NR 12 TC 0 Z9 0 U1 2 U2 7 PU UNIV NORTH CAROLINA PI CHAPEL HILL PA SOUTHERN ECONOMIC JOURNAL, CHAPEL HILL, NC 27514 SN 0038-4038 J9 SOUTHERN ECON J JI South. Econ. J. PD APR PY 1992 VL 58 IS 4 BP 1095 EP 1102 DI 10.2307/1060242 PG 8 WC Economics SC Business & Economics GA HP159 UT WOS:A1992HP15900017 ER PT J AU MATTHEWS, RD ROBERTS, J WALKER, WA SANDS, JP AF MATTHEWS, RD ROBERTS, J WALKER, WA SANDS, JP TI MIGRATION OF INTRAVASCULAR BALLOON AFTER PERCUTANEOUS EMBOLOTHERAPY OF VARICOCELE SO UROLOGY LA English DT Article ID OCCLUSION AB Migration of an intravascular balloon following embolic therapy for varicocele is uncommon. A third case is reported of migration of a left internal spermatic vein embolic balloon to the right lung in an otherwise healthy twenty-five-year-old male who was treated for a symptomatic left varicocele. The patient, a student naval aviator in the jet pilot program, has had his career adversely affected by this complication. C1 USN HOSP,DEPT UROL,SAN DIEGO,CA 92134. RP MATTHEWS, RD (reprint author), USN HOSP,DEPT CLIN INVEST,SAN DIEGO,CA 92134, USA. NR 8 TC 7 Z9 7 U1 0 U2 0 PU CAHNERS PUBL CO PI NEW YORK PA 249 WEST 17 STREET, NEW YORK, NY 10011 SN 0090-4295 J9 UROLOGY JI UROLOGY PD APR PY 1992 VL 39 IS 4 BP 373 EP 375 DI 10.1016/0090-4295(92)90217-K PG 3 WC Urology & Nephrology SC Urology & Nephrology GA HN889 UT WOS:A1992HN88900016 PM 1557851 ER PT J AU OLSEN, RG AF OLSEN, RG TI DEVELOPMENT OF DOSIMETRY MONITORS FOR MRI STAFF AND PATIENTS SO ANNALS OF THE NEW YORK ACADEMY OF SCIENCES LA English DT Article ID TISSUE; FIELD; MODEL RP OLSEN, RG (reprint author), USN,AEROSP MED RES LAB,DIV BIOENGN,PENSACOLA,FL 32508, USA. NR 11 TC 3 Z9 3 U1 0 U2 0 PU NEW YORK ACAD SCIENCES PI NEW YORK PA 2 E 63RD ST, NEW YORK, NY 10021 SN 0077-8923 J9 ANN NY ACAD SCI JI Ann. N.Y. Acad. Sci. PD MAR 31 PY 1992 VL 649 BP 237 EP 241 DI 10.1111/j.1749-6632.1992.tb49612.x PG 5 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA JM217 UT WOS:A1992JM21700018 PM 1580496 ER PT J AU KIRKPATRICK, DA BERGERON, GL CZARNASKI, MA HICKMAN, JJ CHOW, GM PRICE, R RATNA, BL SCHOEN, PE STOCKTON, WB BARAL, S TING, AC SCHNUR, JM AF KIRKPATRICK, DA BERGERON, GL CZARNASKI, MA HICKMAN, JJ CHOW, GM PRICE, R RATNA, BL SCHOEN, PE STOCKTON, WB BARAL, S TING, AC SCHNUR, JM TI DEMONSTRATION OF VACUUM FIELD-EMISSION FROM A SELF-ASSEMBLING BIOMOLECULAR MICROSTRUCTURE COMPOSITE SO APPLIED PHYSICS LETTERS LA English DT Article ID TUBULES AB We report the first demonstration of vacuum field emission from an electron source fabricated from self-assembling biomolecular composite microstructures. Diacetylenic lipid DC8,9PC is used to form hollow, 0.5-mu-m diam, > 50-mu-m long, tubelike structures that are subsequently plated with metal and formed into an aligned composite in an epoxy matrix. The composite material is thin-sectioned across the axis of alignment and then etched to expose the plated tubules. The sharp edges of the exposed metal tubles produce a very large local electric field enhancement, allowing for the vacuum field emission of significant current densities at relatively low applied macroscopic fields (less-than-or-equal-to 60-80 kV/cm). C1 USN,CTR BIOMOLEC SCI & ENGN,WASHINGTON,DC 20375. RP KIRKPATRICK, DA (reprint author), SCI APPLICAT INT CORP,1710 GOODRIDGE DR,MS 2-3-1,MCLEAN,VA 22102, USA. NR 18 TC 12 Z9 12 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 MAR 30 PY 1992 VL 60 IS 13 BP 1556 EP 1558 DI 10.1063/1.107249 PG 3 WC Physics, Applied SC Physics GA HL734 UT WOS:A1992HL73400010 ER PT J AU MELINGER, JS GANDHI, SR HARIHARAN, A TULL, JX WARREN, WS AF MELINGER, JS GANDHI, SR HARIHARAN, A TULL, JX WARREN, WS TI GENERATION OF NARROW-BAND INVERSION WITH BROAD-BAND LASER-PULSES SO PHYSICAL REVIEW LETTERS LA English DT Article ID ADIABATIC RAPID PASSAGE; VIBRATIONAL LEVELS; RABI OSCILLATIONS; OPTICAL FIBERS; PHASE; FREQUENCY; SPECTROSCOPY; EXCITATION; MODULATION; COHERENT AB We show experimentally, here for Na vapor, and theoretically that picosecond frequency-swept laser pulses create in multilevel systems an inversion profile which is far narrower than the pulse spectrum. This selectivity persists even when the Rabi frequency is substantially larger than the spacing between pumped and suppressed transitions. C1 PRINCETON UNIV,PRINCETON CTR PHOTON & OPTOELECTR,PRINCETON,NJ 08544. PRINCETON UNIV,DEPT CHEM,PRINCETON,NJ 08544. RP MELINGER, JS (reprint author), USN,RES LAB,CODE 4613,WASHINGTON,DC 20375, USA. NR 32 TC 139 Z9 142 U1 1 U2 5 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0031-9007 J9 PHYS REV LETT JI Phys. Rev. Lett. PD MAR 30 PY 1992 VL 68 IS 13 BP 2000 EP 2003 DI 10.1103/PhysRevLett.68.2000 PG 4 WC Physics, Multidisciplinary SC Physics GA HL670 UT WOS:A1992HL67000010 ER PT J AU SNAIL, KA VOLD, CL MARKS, CM FREITAS, JA AF SNAIL, KA VOLD, CL MARKS, CM FREITAS, JA TI HIGH-TEMPERATURE EPITAXY OF DIAMOND IN A TURBULENT FLAME SO DIAMOND AND RELATED MATERIALS LA English DT Article ID CHEMICAL VAPOR-DEPOSITION; GROWTH; FILMS C1 USN, RES LAB, DIV OPT SCI, WASHINGTON, DC 20375 USA. USN, RES LAB, DIV MAT SCI & TECHNOL, WASHINGTON, DC 20375 USA. SACHS FREEMAN ASSOCIATES INC, LANDOVER, MD 20785 USA. NR 29 TC 22 Z9 22 U1 0 U2 1 PU ELSEVIER SCIENCE SA PI LAUSANNE PA PO BOX 564, 1001 LAUSANNE, SWITZERLAND SN 0925-9635 J9 DIAM RELAT MATER JI Diam. Relat. Mat. PD MAR 25 PY 1992 VL 1 IS 2-4 BP 180 EP 186 DI 10.1016/0925-9635(92)90021-F PG 7 WC Materials Science, Multidisciplinary SC Materials Science GA JE677 UT WOS:A1992JE67700020 ER PT J AU BOHJANEN, PR PETRYNIAK, B JUNE, CH THOMPSON, CB LINDSTEN, T AF BOHJANEN, PR PETRYNIAK, B JUNE, CH THOMPSON, CB LINDSTEN, T TI AU RNA-BINDING FACTORS DIFFER IN THEIR BINDING SPECIFICITIES AND AFFINITIES SO JOURNAL OF BIOLOGICAL CHEMISTRY LA English DT Article ID 3' UNTRANSLATED REGION; IL-2 MESSENGER-RNA; ACTIVATION PATHWAY; RICH SEQUENCES; LYMPHOCYTES-T; REV PROTEIN; GM-CSF; STABILITY; DEGRADATION; INVITRO AB AUUUA multimers present in the 3'-untranslated region of mature lymphokine and cytokine transcripts have been implicated in the regulation of mRNA stability and translational efficiency. We have identified RNA-binding factors, termed AU-A, AU-B, and AU-C, that interact with AUUUA multimers. AU-A is an abundant, constitutively expressed 34-kDa factor that localizes primarily to the nucleus. AU-A binds to AUUUA multimers with low relative affinity and also binds to other U-rich sequences, including a poly(U) sequence. AU-B and AU-C are 30- and 43-kDa cytoplasmic factors that are induced following T cell receptor-mediated stimulation of purified human T cells and bind to AUUUA multimers with high affinity. Protease cleavage of AU-A, AU-B, and AU-C RNA-protein complexes indicate that AU-B and AU-C are structurally related to each other but distinct from AU-A. AU-B and AU-C require three or more tandem AUUUA repeats for efficient binding, and binding by these factors poorly tolerates mutations in the AUUUA recognition sequence. The precise binding specificity, high affinity, pattern of induction, and cytoplasmic localization all suggest that the structurally related AU-B and AU-C RNA-binding factors could be cytoplasmic regulators of lymphokine mRNA metabolism. C1 UNIV MICHIGAN,CELLULAR & MOLEC BIOL PROGRAM,ANN ARBOR,MI 48109. UNIV MICHIGAN,HOWARD HUGHES MED INST,ANN ARBOR,MI 48109. USN,MED RES INST,BETHESDA,MD 20814. UNIV MICHIGAN,DEPT INTERNAL MED,ANN ARBOR,MI 48109. UNIV MICHIGAN,DEPT PATHOL,ANN ARBOR,MI 48109. UNIV MICHIGAN,DEPT MICROBIOL & IMMUNOL,ANN ARBOR,MI 48109. RI Bohjanen, Paul/B-2329-2015 OI Bohjanen, Paul/0000-0002-2772-3597 FU NCI NIH HHS [CA54521] NR 32 TC 157 Z9 157 U1 0 U2 0 PU AMER SOC BIOCHEMISTRY MOLECULAR BIOLOGY INC PI BETHESDA PA 9650 ROCKVILLE PIKE, BETHESDA, MD 20814 SN 0021-9258 J9 J BIOL CHEM JI J. Biol. Chem. PD MAR 25 PY 1992 VL 267 IS 9 BP 6302 EP 6309 PG 8 WC Biochemistry & Molecular Biology SC Biochemistry & Molecular Biology GA HK318 UT WOS:A1992HK31800088 PM 1532580 ER PT J AU WILLIAMSON, BE VANCOTT, TC BOYLE, ME MISENER, GC STILLMAN, MJ SCHATZ, PN AF WILLIAMSON, BE VANCOTT, TC BOYLE, ME MISENER, GC STILLMAN, MJ SCHATZ, PN TI DETERMINATION OF THE GROUND-STATE OF MANGANESE PHTHALOCYANINE IN AN ARGON MATRIX USING MAGNETIC CIRCULAR-DICHROISM AND ABSORPTION-SPECTROSCOPY SO JOURNAL OF THE AMERICAN CHEMICAL SOCIETY LA English DT Article ID ELECTRONIC-STRUCTURE; ZINC PHTHALOCYANINE; SPECTRA AB The magnetic circular dichroism (MCD) and absorption spectra of manganese phthalocyanine isolated in an Ar matrix (MnPc/Ar) have been studied at a temperature of approximately 5 K over the range 10000-33000 cm-1. The absorption spectrum exhibits strong, resolved bands at 11 600, 15 000, 16 500, 19 700, 20 300, 22 600, and 29 600 cm-1. The data require an orbitally degenerate ground state and are quantitatively consistent with a 4E(g)(e(g)3b(2g)a1g) ground-state term with g parallel-to = 8.0 +/- 0.8. This differs from the beta-phase solid where magnetic susceptibility measurements establish a 4A2g(b2g2e(g)2a1g) ground state, which is probably a consequence of intermolecular interactions. The dispersion of the MCD allows assignment of the 15 000- and 16 500-cm-1 bands respectively to a ligand-to-metal charge-transfer (LMCT) transition and the Q (pi --> pi*) transition. This result suggests that the strongest red band in the solution spectra of MnPc, normally assigned to the Q (pi --> pi*) transition, also contains contributions from a LMCT transition. C1 UNIV VIRGINIA,DEPT CHEM,CHARLOTTESVILLE,VA 22901. USN,RES LAB,WASHINGTON,DC 20375. UNIV WESTERN ONTARIO,DEPT CHEM,LONDON N6A 5B7,ONTARIO,CANADA. RP WILLIAMSON, BE (reprint author), UNIV CANTERBURY,DEPT CHEM,CHRISTCHURCH 1,NEW ZEALAND. RI Stillman, Martin/O-3191-2016 OI Stillman, Martin/0000-0001-6799-7560 NR 40 TC 46 Z9 46 U1 1 U2 15 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 25 PY 1992 VL 114 IS 7 BP 2412 EP 2419 DI 10.1021/ja00033a016 PG 8 WC Chemistry, Multidisciplinary SC Chemistry GA HK671 UT WOS:A1992HK67100016 ER PT J AU GAMMON, D SHANABROOK, BV RYAN, JC KATZER, DS YANG, MJ AF GAMMON, D SHANABROOK, BV RYAN, JC KATZER, DS YANG, MJ TI EXCHANGE AND CORRELATION IN THE NONHOMOGENEOUS ELECTRON-GAS IN SEMICONDUCTOR HETEROJUNCTIONS SO PHYSICAL REVIEW LETTERS LA English DT Article ID QUANTUM-WELL; DENSITY AB We present a detailed comparison between experiment and theory of the magnitude of the exchange-correlation Coulomb interaction in the collective intersubband spin-density excitation of the electron gas confined to GaAs/AlGaAs quantum wells. A widely used self-consistent-field theory in which exchange and correlation is incorporated through the local-density approximation is found to underestimate slightly the magnitude of the interaction, while a nonlocal theory involving a variational solution of the Bethe-Salpeter equation for the density-density correlation function compares well with experiment. C1 SFA INC, LANDOVER, MD 20785 USA. RP USN, RES LAB, WASHINGTON, DC 20375 USA. RI Katzer, D. Scott/N-7841-2013 NR 14 TC 68 Z9 69 U1 0 U2 2 PU AMER PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0031-9007 EI 1079-7114 J9 PHYS REV LETT JI Phys. Rev. Lett. PD MAR 23 PY 1992 VL 68 IS 12 BP 1884 EP 1887 DI 10.1103/PhysRevLett.68.1884 PG 4 WC Physics, Multidisciplinary SC Physics GA HK319 UT WOS:A1992HK31900026 ER PT J AU SCHEPS, R MYERS, JF AF SCHEPS, R MYERS, JF TI SCALABLE SINGLE-FREQUENCY DIODE-PUMPED RING LASER SO APPLIED OPTICS LA English DT Article ID Q-SWITCHED OPERATION AB A diode-pumped discrete-element ring laser that can be end pumped simultaneously along two intersecting axes is described. The maximum power obtained was 493-mW single frequency at 1.06-mu-m. A demonstration of cw and Q-switched operations was performed for the fundamental and second harmonic, and a second-harmonic conversion efficiency of 43% was obtained. This ring laser is shown to incorporate significant advantages in terms of alignment and scalability. RP SCHEPS, R (reprint author), USN,CTR OCEAN SYST,CODE 843,271 CATALINA BLVD,SAN DIEGO,CA 92152, USA. NR 13 TC 4 Z9 4 U1 0 U2 2 PU OPTICAL SOC AMER PI WASHINGTON PA 2010 MASSACHUSETTS AVE NW, WASHINGTON, DC 20036 SN 0003-6935 J9 APPL OPTICS JI Appl. Optics PD MAR 20 PY 1992 VL 31 IS 9 BP 1221 EP 1224 PG 4 WC Optics SC Optics GA HJ278 UT WOS:A1992HJ27800013 PM 20720745 ER PT J AU PAVLOPOULOS, TG AF PAVLOPOULOS, TG TI MEASUREMENT OF TRIPLET OPTICAL DENSITIES OF ORGANIC-COMPOUNDS IN THE PRESENCE OF PHOTODECOMPOSITION SO APPLIED OPTICS LA English DT Article ID EXTINCTION COEFFICIENTS; LASER-DYES; ABSORPTION; SPECTRA AB We have developed a method to measure triplet optical densities OD(r)(lambda) when considerable photodecomposition is present. The method is demonstrated on Coumarin 120. By focusing an UV cw laser beam on a sample with the aid of a lens, high triplet optical densities OD(T)(lambda) can be recorded. However, the excitation of organic compounds with light causes varying degrees of photodecomposition. In order to take photodecomposition into account, one records triplet optical-density values as well as the accumulation of absorbing photoproducts as a function of time. Turning off the cw laser excitation, one records the accumulation of photoproducts only. Separating the two processes, one can determine how the triplet optical density OD(T) declines as a function of time t. The obtained curve can be expressed with an equation that appears to decline exponentially with time. This allows one to extrapolate back to t = 0 and recover OD(T) when there was no photodecomposition. The extrapolated OD(T) values are used to obtain triplet-extinction coefficients epsilon(T)(lambda) by McClure's method of Coumarin 120. RP PAVLOPOULOS, TG (reprint author), USN,CTR OCEAN SYST,DEPT MARINE SCI & TECHNOL,SAN DIEGO,CA 92152, USA. NR 11 TC 0 Z9 0 U1 0 U2 0 PU OPTICAL SOC AMER PI WASHINGTON PA 2010 MASSACHUSETTS AVE NW, WASHINGTON, DC 20036 SN 0003-6935 J9 APPL OPTICS JI Appl. Optics PD MAR 20 PY 1992 VL 31 IS 9 BP 1261 EP 1266 PG 6 WC Optics SC Optics GA HJ278 UT WOS:A1992HJ27800021 ER PT J AU TAMBURRINI, M GOLDBERG, L MEHUYS, D AF TAMBURRINI, M GOLDBERG, L MEHUYS, D TI PERIODIC FILAMENTS IN REFLECTIVE BROAD AREA SEMICONDUCTOR OPTICAL AMPLIFIERS SO APPLIED PHYSICS LETTERS LA English DT Article ID LASERS AB Filaments with a regular spacing of the order of 25-mu-m are experimentally observed in double-pass broad area GaAlAs amplifiers for near normal injection angle. Their formation is attributed to nonlinear interaction between counterpropagating beams and Talbot self-imaging. C1 SPECTRA DIODE LABS,SAN JOSE,CA 95134. RP TAMBURRINI, M (reprint author), USN,RES LAB,CODE 6570,WASHINGTON,DC 20375, USA. NR 10 TC 36 Z9 36 U1 0 U2 1 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0003-6951 J9 APPL PHYS LETT JI Appl. Phys. Lett. PD MAR 16 PY 1992 VL 60 IS 11 BP 1292 EP 1294 DI 10.1063/1.107320 PG 3 WC Physics, Applied SC Physics GA HH876 UT WOS:A1992HH87600006 ER PT J AU WRIGHT, ME TOPLIKAR, EG KUBIN, RF SELTZER, MD AF WRIGHT, ME TOPLIKAR, EG KUBIN, RF SELTZER, MD TI ORGANOMETALLIC NONLINEAR OPTICAL (NLO) POLYMERS .1. PENDANT FERROCENE NLO-PHORES IN A POLY(METHYL METHACRYLATE) COPOLYMER - THE 1ST CHI(2) ORGANOMETALLIC NLO POLYMER SO MACROMOLECULES LA English DT Note ID GENERATION C1 USN,CTR AIR WARFARE,RES DEPT,DIV CHEM,CHINA LAKE,CA 93555. RP WRIGHT, ME (reprint author), UTAH STATE UNIV,DEPT CHEM & BIOCHEM,LOGAN,UT 84322, USA. NR 16 TC 59 Z9 59 U1 0 U2 2 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0024-9297 J9 MACROMOLECULES JI Macromolecules PD MAR 16 PY 1992 VL 25 IS 6 BP 1838 EP 1839 DI 10.1021/ma00032a035 PG 2 WC Polymer Science SC Polymer Science GA HJ861 UT WOS:A1992HJ86100035 ER PT J AU DENARDO, B GALVIN, B GREENFIELD, A LARRAZA, A PUTTERMAN, S WRIGHT, W AF DENARDO, B GALVIN, B GREENFIELD, A LARRAZA, A PUTTERMAN, S WRIGHT, W TI OBSERVATIONS OF LOCALIZED STRUCTURES IN NONLINEAR LATTICES - DOMAIN-WALLS AND KINKS SO PHYSICAL REVIEW LETTERS LA English DT Article ID SOLITON AB Steady-state domain walls and kinks have been observed in one-dimensional nonlinear lattices that are damped and parametrically driven. These states are localized robust transition regions between two extended standing-wave domains of definite wave number. The observations are made in an experimental lattice of coupled pendulums and in simplified numerical models. A nonlinear Schrodinger theory is developed for kinks in the upper cutoff mode. There is currently no theory for the domain walls and noncutoff kinks, which are fundamentally new localized structures. C1 UNIV CALIF LOS ANGELES,DEPT PHYS,LOS ANGELES,CA 90024. RP DENARDO, B (reprint author), USN,POSTGRAD SCH,DEPT PHYS,MONTEREY,CA 93943, USA. NR 12 TC 152 Z9 155 U1 0 U2 2 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0031-9007 J9 PHYS REV LETT JI Phys. Rev. Lett. PD MAR 16 PY 1992 VL 68 IS 11 BP 1730 EP 1733 DI 10.1103/PhysRevLett.68.1730 PG 4 WC Physics, Multidisciplinary SC Physics GA HJ807 UT WOS:A1992HJ80700029 ER PT J AU BRADY, RF WAKE, LV AF BRADY, RF WAKE, LV TI PRINCIPLES AND FORMULATIONS FOR ORGANIC COATINGS WITH TAILORED INFRARED PROPERTIES SO PROGRESS IN ORGANIC COATINGS LA English DT Review C1 USN,RES LAB,DIV CHEM,MAT CHEM BRANCH,WASHINGTON,DC 20375. RP BRADY, RF (reprint author), DEF SCI & TECHNOL ORG,DEPT DEF,MAT RES LAB,POB 50,ASCOT,VIC 3032,AUSTRALIA. NR 43 TC 34 Z9 38 U1 0 U2 9 PU ELSEVIER SCIENCE SA LAUSANNE PI LAUSANNE 1 PA PO BOX 564, 1001 LAUSANNE 1, SWITZERLAND SN 0300-9440 J9 PROG ORG COAT JI Prog. Org. Coat. PD MAR 16 PY 1992 VL 20 IS 1 BP 1 EP 25 DI 10.1016/0033-0655(92)85001-C PG 25 WC Chemistry, Applied; Materials Science, Coatings & Films SC Chemistry; Materials Science GA HM820 UT WOS:A1992HM82000001 ER PT J AU GRATE, JW KLUSTY, M MCGILL, RA ABRAHAM, MH WHITING, G ANDONIANHAFTVAN, J AF GRATE, JW KLUSTY, M MCGILL, RA ABRAHAM, MH WHITING, G ANDONIANHAFTVAN, J TI THE PREDOMINANT ROLE OF SWELLING-INDUCED MODULUS CHANGES OF THE SORBENT PHASE IN DETERMINING THE RESPONSES OF POLYMER-COATED SURFACE ACOUSTIC-WAVE VAPOR SENSORS SO ANALYTICAL CHEMISTRY LA English DT Article ID PARTITION-COEFFICIENTS; PIEZOELECTRIC CRYSTAL; PATTERN-RECOGNITION; CHEMICAL-ANALYSIS; DEVICES; COATINGS; GAS; INSTRUMENT; DETECTOR; MASS AB The sorption of vapors by fluoropolyol, poly(epichlorohydrin), and poly(isobutylene) is examined by gas-liquid chromatography (GLC), and these results are compared with the responses of surface acoustic wave (SAW) vapor sensors coated with the same polymers. The sensor responses exceed those which can be attributed to gravimetric effects, indicating that the SAW devices are responding to some other change in the coating properties. A model is developed to estimate the effect of polymer swelling on SAW sensor responses. The model is based on the use of partition coefficients determined by GLC as an independent measure of polymer mass loading, and polymer thermal expansion on SAW surfaces as a measure of volume change effects which is independent of mass loading effects. Both experimental comparisons and the model indicate that swelling effects can be ca. 4 times greater than mass-loading effects. The likely mechanism by which swelling influences the SAW sensor response is via reductions in the modulus of the polymer overlayer. C1 GEOCENTERS INC, FT WASHINGTON, MD 20744 USA. UNIV LONDON UNIV COLL, DEPT CHEM, LONDON WC1H 0AJ, ENGLAND. RP USN, RES LAB, DIV CHEM, WASHINGTON, DC 20375 USA. NR 46 TC 126 Z9 127 U1 0 U2 2 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0003-2700 EI 1520-6882 J9 ANAL CHEM JI Anal. Chem. PD MAR 15 PY 1992 VL 64 IS 6 BP 610 EP 624 DI 10.1021/ac00030a009 PG 15 WC Chemistry, Analytical SC Chemistry GA HJ267 UT WOS:A1992HJ26700009 ER PT J AU GAZDAR, AF AF GAZDAR, AF TI MOLECULAR MARKERS FOR THE DIAGNOSIS AND PROGNOSIS OF LUNG-CANCER SO CANCER LA English DT Article; Proceedings Paper CT WORKSHOP ON MOLECULAR MARKERS IN THE CLASSIFICATION AND STAGING OF CANCER CY DEC 13-14, 1990 CL ATLANTA, GA SP AMER CANC SOC, AMER JOINT COMM CANC ID SMALL-CELL-CARCINOMA; RETINOBLASTOMA SUSCEPTIBILITY GENE; MULTIDRUG RESISTANCE GENE; POLYMERASE CHAIN-REACTION; ENVELOPE-RELATED MARKERS; L-DOPA DECARBOXYLASE; K-RAS ONCOGENE; P53 GENE; SQUAMOUS DIFFERENTIATION; ACTIVATING MUTATIONS AB Molecular probes for lung cancer have greatly increased the understanding of the biology of this disease and the preneoplastic changes that precede it. They have confirmed and extended the clinical, pathologic, and biologic reasons for the primary division of lung cancers into small cell and non-small cell lung cancer types. Many molecular changes are present in lung cancers and involve dominant oncogenes and recessive growth regulatory genes. Clinical application of these markers will aid diagnosis, classification, and clinical management. C1 NCI,USN HOSP,MED ONCOL BRANCH,BETHESDA,MD 20892. NR 89 TC 46 Z9 46 U1 0 U2 0 PU WILEY-LISS PI NEW YORK PA DIV JOHN WILEY & SONS INC 605 THIRD AVE, NEW YORK, NY 10158-0012 SN 0008-543X J9 CANCER JI Cancer PD MAR 15 PY 1992 VL 69 IS 6 SU S BP 1592 EP 1599 DI 10.1002/1097-0142(19920315)69:6+<1592::AID-CNCR2820691315>3.0.CO;2-R PG 8 WC Oncology SC Oncology GA HJ806 UT WOS:A1992HJ80600014 PM 1311627 ER PT J AU SUTPHIN, J WEBER, P BUCK, M FULCHER, S DIAZSOLA, J HOOPER, D AF SUTPHIN, J WEBER, P BUCK, M FULCHER, S DIAZSOLA, J HOOPER, D TI DETECTION OF CHLAMYDIA-TRACHOMATIS BY CHEMILUMINESCENT DNA PROBE - PRELIMINARY-RESULTS SO INVESTIGATIVE OPHTHALMOLOGY & VISUAL SCIENCE LA English DT Meeting Abstract C1 USN HOSP,DEPT OPHTHALMOL,SAN DIEGO,CA 92134. USN HOSP,DEPT PATHOL,DIV EXPTL PATHOL,SAN DIEGO,CA 92134. NR 0 TC 0 Z9 0 U1 0 U2 0 PU LIPPINCOTT-RAVEN PUBL PI PHILADELPHIA PA 227 EAST WASHINGTON SQ, PHILADELPHIA, PA 19106 SN 0146-0404 J9 INVEST OPHTH VIS SCI JI Invest. Ophthalmol. Vis. Sci. PD MAR 15 PY 1992 VL 33 IS 4 BP 848 EP 848 PG 1 WC Ophthalmology SC Ophthalmology GA HK135 UT WOS:A1992HK13500782 ER PT J AU AVALLONE, J FULCHER, S HANNEKEN, A GIMELLI, G SUTPHIN, J HOUSTON, LL FOULKS, G AF AVALLONE, J FULCHER, S HANNEKEN, A GIMELLI, G SUTPHIN, J HOUSTON, LL FOULKS, G TI COMPARATIVE ANTERIOR SEGMENT LOCALIZATION OF MONOCLONAL-ANTIBODIES 454A12 AND 260F9 IN THE HUMAN EYE SO INVESTIGATIVE OPHTHALMOLOGY & VISUAL SCIENCE LA English DT Meeting Abstract C1 USN HOSP,SAN DIEGO,CA 92134. CETUS CORP,BERKELEY,CA 94710. DUKE UNIV,DURHAM,NC 27706. WHITTIER INST,SAN DIEGO,CA. 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 1992 VL 33 IS 4 BP 1237 EP 1237 PG 1 WC Ophthalmology SC Ophthalmology GA HK135 UT WOS:A1992HK13502717 ER PT J AU MARTINEZ, JA HASTY, B AF MARTINEZ, JA HASTY, B TI BIOERODABLE AND NON-ERODABLE POLYMERS FOR THE DELIVERY OF 5-FLUOROURIDINE IN MOLTENO SHUNT SURGERY SO INVESTIGATIVE OPHTHALMOLOGY & VISUAL SCIENCE LA English DT Meeting Abstract C1 MED CTR CLIN,PENSACOLA,FL. USN HOSP,DEPT OPHTHALMOL,PORTSMOUTH,VA. 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 1992 VL 33 IS 4 BP 1392 EP 1392 PG 1 WC Ophthalmology SC Ophthalmology GA HK135 UT WOS:A1992HK13503496 ER PT J AU ROBINSON, H HAHN, Y GAU, JN AF ROBINSON, H HAHN, Y GAU, JN TI A COMPREHENSIVE ANALYSIS OF SURFACE ACOUSTIC-WAVE REFLECTIONS .3. OBLIQUE-INCIDENCE GROOVED AND METALLIC GRATINGS SO JOURNAL OF APPLIED PHYSICS LA English DT Article ID SAW GRATINGS; PROPAGATION AB First- and second-order reflection effects in oblique incidence surface acoustic wave gratings are examined. A general formulation usable for both metallic and same material grooved overlays is provided. The existence of several important effects, particularly a reflection effect at the second harmonic of the grating and a velocity shift at the first harmonic for grooved gratings, are demonstrated, and the behavior of these effects as a function of incidence angle is examined. For angles of incidence of interest in the production of reflective array compressors, these effects are analyzed as a function of metallization ratio. C1 UNIV CONNECTICUT,STORRS,CT 06269. ANDERSEN LABS,BLOOMFIELD,CT 06002. RP ROBINSON, H (reprint author), USN,CTR UNDERSEA WARFARE,NEW LONDON,CT 06320, USA. NR 23 TC 1 Z9 1 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 1992 VL 71 IS 6 BP 2536 EP 2548 DI 10.1063/1.351070 PG 13 WC Physics, Applied SC Physics GA HJ655 UT WOS:A1992HJ65500009 ER PT J AU CELII, FG BUTLER, JE AF CELII, FG BUTLER, JE TI DIRECT MONITORING OF CH3 IN A FILAMENT-ASSISTED DIAMOND CHEMICAL VAPOR-DEPOSITION REACTOR SO JOURNAL OF APPLIED PHYSICS LA English DT Article ID MULTIPHOTON IONIZATION SPECTROSCOPY; GROWTH-MECHANISM; CARBON-ATOMS; FILM GROWTH; METHYL; ACETYLENE; HYDROGEN; METHANE; FLAMES AB The technique of resonance-enhanced multiphoton ionization (REMPI) was used to determine relative density distributions of gas-phase methyl radical (CH3) in a filament-assisted diamond chemical vapor deposition reactor. The dependences of CH3 concentration on input CH4/H2 ratio, filament temperature, and distance from the filament were determined. We also report similar REMPI data for excited-state C(1D) atoms, which were produced photolytically from an unknown gas-phase parent. Arrhenius parameters show that the CH3 is not the parent of the C(1D) atoms. The CH3 density saturates at high filament temperature. We compare the REMPI measurements with other determinations and models of CH3 concentrations. C1 USN,RES LAB,GAS SURFACE DYNAM SECT,WASHINGTON,DC 20375. RI Butler, James/B-7965-2008 OI Butler, James/0000-0002-4794-7176 NR 38 TC 64 Z9 64 U1 0 U2 4 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0021-8979 J9 J APPL PHYS JI J. Appl. Phys. PD MAR 15 PY 1992 VL 71 IS 6 BP 2877 EP 2883 DI 10.1063/1.351019 PG 7 WC Physics, Applied SC Physics GA HJ655 UT WOS:A1992HJ65500064 ER PT J AU MAY, DA STOWE, LL HAWKINS, JD MCCLAIN, EP AF MAY, DA STOWE, LL HAWKINS, JD MCCLAIN, EP TI A CORRECTION FOR SAHARAN DUST EFFECTS ON SATELLITE SEA-SURFACE TEMPERATURE-MEASUREMENTS SO JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS LA English DT Article ID AVHRR DATA; AEROSOLS; CLOUD; OCEAN AB Sea surface temperature (SST) retrievals obtained from NOAA advanced very high resolution radiometer (AVHRR) data can determine SST within 0.7-degrees-C on a global basis. However, retrievals have been severely limited in the presence of tropospheric aerosol particles because no adequate aerosol correction algorithm exists. High tropospheric aerosol concentrations in the atmosphere significantly increase infrared signal attenuation and prevent the retrieval of accurate satellite SSTs. This paper presents tropospheric aerosol correction algorithms derived from NOAA AVHRR SST and optical depth measurements and from drifting buoy in situ SSTs. We show that the correction algorithms perform better than the current global algorithm in an atmosphere that contains high Saharan dust concentrations and generate statistical accuracy comparable to satellite SST performance globally. These corrections would significantly increase the quantity and quality of satellite retrievals under such atmospheric conditions, and the observations would greatly benefit both global climate research and maritime operations conducted in such regions. C1 NOAA,NATL ENVIRONM SATELLITE,SATELLITE RES LAB,CAMP SPRINGS,MD 20233. RP MAY, DA (reprint author), USN,OCEANOG & ATMOSPHER RES LAB,REMOTE SENSING BRANCH,BAY ST LOUIS,MS 39529, USA. NR 28 TC 38 Z9 38 U1 1 U2 4 PU AMER GEOPHYSICAL UNION PI WASHINGTON PA 2000 FLORIDA AVE NW, WASHINGTON, DC 20009 SN 0148-0227 J9 J GEOPHYS RES-OCEANS JI J. Geophys. Res.-Oceans PD MAR 15 PY 1992 VL 97 IS C3 BP 3611 EP 3619 DI 10.1029/91JC02987 PG 9 WC Oceanography SC Oceanography GA HJ488 UT WOS:A1992HJ48800010 ER PT J AU COHN, JL WOLF, SA VANDERAH, TA SELVAMANICKAM, V SALAMA, K AF COHN, JL WOLF, SA VANDERAH, TA SELVAMANICKAM, V SALAMA, K TI LATTICE THERMAL-CONDUCTIVITY OF YBA2CU3O7-DELTA SO PHYSICA C LA English DT Article ID HIGH-TC SUPERCONDUCTORS; CURRENT-DENSITY; ANISOTROPY AB We report a systematic study of the ab-plane thermal conductivity (kappa) on single crystal and liquid-phase processed (LPP) specimens of YBa2Cu3O7-delta (delta less-than-or-equal-to 0.16) in the temperature range 10 K less-than-or-equal-to T less-than-or-equal-to 300 K. From measurements of electrical conductivity on the same specimens and application of the Wiedemann-Franz law we estimate the relative contributions to the heat conduction from the carriers and the lattice. The normal-state phonon scattering mechanisms are quantified by calculations which employ the conventional theory of lattice heat conduction by longitudinal acoustic phonons. Differences in the magnitude and temperature dependence of kappa for the LPP and crystal specimens are accounted for by differences in the relative weight of phonon-defect, phonon-carrier, and phonon-phonon scattering. For all specimens phonon-defect scattering predominates throughout most of the temperature range. C1 USN,CTR WEAP,CHINA LAKE,CA 90124. UNIV HOUSTON,TEXAS CTR SUPERCONDUCT,HOUSTON,TX 77044. RP COHN, JL (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. RI Wolf, Stuart/A-7513-2009 NR 28 TC 45 Z9 45 U1 0 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0921-4534 J9 PHYSICA C JI Physica C PD MAR 15 PY 1992 VL 192 IS 3-4 BP 435 EP 442 DI 10.1016/0921-4534(92)90850-C PG 8 WC Physics, Applied SC Physics GA HM225 UT WOS:A1992HM22500021 ER PT J AU SIGALAS, M PAPACONSTANTOPOULOS, DA BACALIS, NC AF SIGALAS, M PAPACONSTANTOPOULOS, DA BACALIS, NC TI TOTAL ENERGY AND BAND-STRUCTURE OF THE 3D, 4D, AND 5D METALS SO PHYSICAL REVIEW B LA English DT Article ID GROUND-STATE PROPERTIES; TRANSITION-METALS; BCC; 4D-TRANSITION; CRYSTAL; SOLIDS; FCC AB We performed total-energy calculations by the scalar-relativistic augmented-plane-wave method in the local-density and muffin-tin approximations for all 3d, 4d, and 5d transition metals in the fcc and bcc structures. These calculations predict the correct equilibrium structure and give good agreement with experiment and other calculations for lattice constants and bulk moduli. C1 USN, RES LAB, COMPLEX SYST THEORY BRANCH, WASHINGTON, DC 20375 USA. NATL HELLENIC RES FDN, GR-11635 ATHENS, GREECE. RP SIGALAS, M (reprint author), RES CTR CRETE, POB 527, GR-71110 IRAKLION, GREECE. RI Bacalis, Naoum/G-5327-2013 OI Bacalis, Naoum/0000-0002-9565-0414 NR 25 TC 94 Z9 95 U1 0 U2 7 PU AMER PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1098-0121 EI 1550-235X J9 PHYS REV B JI Phys. Rev. B PD MAR 15 PY 1992 VL 45 IS 11 BP 5777 EP 5783 DI 10.1103/PhysRevB.45.5777 PG 7 WC Physics, Condensed Matter SC Physics GA HJ812 UT WOS:A1992HJ81200001 ER PT J AU DENBOER, ML PAK, YS ADAMIC, KJ GREENBAUM, SG WINTERSGILL, MC LOMAX, JF FONTANELLA, JJ DUNN, B FARRINGTON, GC AF DENBOER, ML PAK, YS ADAMIC, KJ GREENBAUM, SG WINTERSGILL, MC LOMAX, JF FONTANELLA, JJ DUNN, B FARRINGTON, GC TI DISORDER IN BETA''-ALUMINAS - DIELECTRIC-RELAXATION AND X-RAY ABSORPTION SO PHYSICAL REVIEW B LA English DT Article ID VITREOUS SILICA; FINE-STRUCTURE; CONDUCTIVITY; SPECTROSCOPY; ALUMINA AB Beta"-aluminas substituted with rare-earth elements (Pr, Nd, Er, and Tb) and Sn have been studied using near-edge and extended x-ray-absorption fine structure (NEXAFS and EXAFS). In addition, dielectric-relaxation (DR) measurements have been made on Na-beta-, Na-beta"-, and Na-Er-beta"-alumina. Both the DR and EXAFS results confirm that disorder, particularly in the conduction plane, in the vicinity of the rare-earth ions is a key feature of the beta"-aluminas. The NEXAFS studies show that the rare-earth ions are ionized to trivalency and are highly localized; in contrast, Sn is clearly divalent, as in SnO. C1 USN ACAD, DEPT PHYS, ANNAPOLIS, MD 21402 USA. USN ACAD, DEPT CHEM, ANNAPOLIS, MD 21402 USA. UNIV CALIF LOS ANGELES, DEPT MAT SCI & ENGN, LOS ANGELES, CA 90024 USA. UNIV PENN, DEPT MAT SCI & ENGN, PHILADELPHIA, PA 19104 USA. RP DENBOER, ML (reprint author), CUNY HUNTER COLL, DEPT PHYS, NEW YORK, NY 10021 USA. NR 17 TC 4 Z9 4 U1 1 U2 3 PU AMER PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1098-0121 EI 1550-235X J9 PHYS REV B JI Phys. Rev. B PD MAR 15 PY 1992 VL 45 IS 12 BP 6369 EP 6375 DI 10.1103/PhysRevB.45.6369 PG 7 WC Physics, Condensed Matter SC Physics GA HL049 UT WOS:A1992HL04900001 ER PT J AU PEDERSON, MR JACKSON, KA BOYER, LL AF PEDERSON, MR JACKSON, KA BOYER, LL TI ENHANCED STABILIZATION OF C-60 CRYSTALS THROUGH DOPING SO PHYSICAL REVIEW B LA English DT Article ID APPROXIMATION; ACCURATE; GRAPHITE; ENERGY AB From accurate density-functional-based calculations employing the generalized-gradient approximation, we predict a molecular cohesive energy of 7.25 +/- 0.1 eV per atom for fullerene. To assess prospects for enhanced stabilization of crystalline C60, we have studied interactions between the molecule and encapsulated and interstitial atoms (K, Cl, and Cr). To study these questions we have performed all-electron total-energy calculations on clusters consisting of C60, C60K, C60Cl, and C60Cr8, and (C6H6)2, (C6H6)2Cr, and (C6H6)Cr. RP PEDERSON, MR (reprint author), USN,RES LAB,COMPLEX SYST THEORY BRANCH,WASHINGTON,DC 20375, USA. OI Jackson, Koblar/0000-0002-5342-7978 NR 28 TC 19 Z9 19 U1 0 U2 2 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD MAR 15 PY 1992 VL 45 IS 12 BP 6919 EP 6922 DI 10.1103/PhysRevB.45.6919 PG 4 WC Physics, Condensed Matter SC Physics GA HL049 UT WOS:A1992HL04900056 ER PT J AU SEITZMAN, LE BOLSTER, RN SINGER, IL AF SEITZMAN, LE BOLSTER, RN SINGER, IL TI X-RAY-DIFFRACTION OF MOS2 COATINGS PREPARED BY ION-BEAM-ASSISTED DEPOSITION SO SURFACE & COATINGS TECHNOLOGY LA English DT Article ID THIN-FILMS; ORIENTATION AB MoS2 coating, 200-600 nm thick, were grown on steel substrates by ion-beam-assisted deposition. In most cases, a thin (about 35 nm) TiN layer was first deposited on the substrates. The argon-ion-to-molybdenum-atom or argon-ion-to-sulfur-atom ratio R was varied from 0 to 0.10 in order to study the effect of the ion beam on MoS2 orientation. The degree of preferred orientation was measured by X-ray diffraction, using a procedure that accounts for coatings of various thickness on different substrates. All the coatings had a strong basal orientation. As R increased from 0 to 0.04, the MoS2 grew with increasing basal orientation. When R increased beyond 0.04, the MoS2 became less basally textured and some edge oriented material began to appear. The orientation of the coatings was independent of thickness and substrate type. RP SEITZMAN, LE (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 24 TC 23 Z9 24 U1 0 U2 3 PU ELSEVIER SCIENCE SA LAUSANNE PI LAUSANNE 1 PA PO BOX 564, 1001 LAUSANNE 1, SWITZERLAND SN 0257-8972 J9 SURF COAT TECH JI Surf. Coat. Technol. PD MAR 15 PY 1992 VL 52 IS 1 BP 93 EP 98 DI 10.1016/0257-8972(92)90375-K PG 6 WC Materials Science, Coatings & Films; Physics, Applied SC Materials Science; Physics GA HK481 UT WOS:A1992HK48100011 ER PT J AU LINGG, LJ BERRY, AD PURDY, AP EWING, KJ AF LINGG, LJ BERRY, AD PURDY, AP EWING, KJ TI SODIUM-FLUORIDE THIN-FILMS BY CHEMICAL VAPOR-DEPOSITION SO THIN SOLID FILMS LA English DT Article ID GLASSES; CALCIUM; BARIUM AB Thin films of sodium fluoride have been deposited for the first time by chemical vapor deposition of the fluorinated metal organic precursors sodium hexafluoroisopropoxide, sodium perfluoro-t-butoxide, sodium hexafluoroacetylacetonate and sodium heptafluoro-octadionate. The best quality films were obtained using sodium hexafluoroisopropoxide in vacuo at a substrate temperature of 250-300-degrees-C. C1 VIRGINIA TECH,FIBER & ELECTRO OPT RES CTR,BLACKSBURG,VA. RP LINGG, LJ (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 21 TC 23 Z9 23 U1 1 U2 4 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 1992 VL 209 IS 1 BP 9 EP 16 DI 10.1016/0040-6090(92)90003-T PG 8 WC Materials Science, Multidisciplinary; Materials Science, Coatings & Films; Physics, Applied; Physics, Condensed Matter SC Materials Science; Physics GA HL635 UT WOS:A1992HL63500002 ER PT J AU MILES, MH AF MILES, MH TI COLD FUSION - CHINA LAKE RESULTS SO SCIENCE LA English DT Letter RP MILES, MH (reprint author), USN,CTR AIR WARFARE,DIV WEAPONS,CHINA LAKE,CA 93555, USA. NR 1 TC 0 Z9 0 U1 2 U2 4 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 13 PY 1992 VL 255 IS 5050 BP 1335 EP 1335 DI 10.1126/science.255.5050.1335-c PG 1 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA HH744 UT WOS:A1992HH74400005 PM 17801191 ER PT J AU BERKOFF, TA KERSEY, AD AF BERKOFF, TA KERSEY, AD TI REFLECTOMETRIC 2-MODE ELLIPTIC-CORE FIBER STRAIN SENSOR WITH REMOTE INTERROGATION SO ELECTRONICS LETTERS LA English DT Article DE OPTICAL SENSORS; OPTICAL FIBERS ID FIBERS AB A reflectometric two-mode elliptical-core fibre strain sensor configuration with lead-insensitive operation is described. The system uses passive laser-FM based phase interrogation and exhibits a high sensitivity to dynamic strain signals. C1 USN,RES LAB,DIV OPT SCI,WASHINGTON,DC 20375. RP BERKOFF, TA (reprint author), SFA INC,1401 MCCORMICK DR,LANDOVER,MD 20785, USA. NR 8 TC 6 Z9 6 U1 0 U2 1 PU IEE-INST ELEC ENG PI HERTFORD PA MICHAEL FARADAY HOUSE SIX HILLS WAY STEVENAGE, HERTFORD, ENGLAND SG1 2AY SN 0013-5194 J9 ELECTRON LETT JI Electron. Lett. PD MAR 12 PY 1992 VL 28 IS 6 BP 562 EP 564 DI 10.1049/el:19920355 PG 3 WC Engineering, Electrical & Electronic SC Engineering GA HJ767 UT WOS:A1992HJ76700028 ER PT J AU KEENAN, FP COOK, JW DUFTON, PL KINGSTON, AE AF KEENAN, FP COOK, JW DUFTON, PL KINGSTON, AE TI SOLAR SI-II LINE RATIOS FROM THE HIGH-RESOLUTION TELESCOPE AND SPECTROGRAPH SO ASTROPHYSICAL JOURNAL LA English DT Article DE ATOMIC PROCESSES; SUN, TRANSITION REGION; SUN, UV RADIATION; SUNSPOTS ID ELECTRON-IMPACT EXCITATION; OSCILLATOR-STRENGTHS; TRANSITION REGION; SEMI-FORBIDDEN; FINE-STRUCTURE; SUN; TEMPERATURE; IV AB New calculations of electron-impact excitation rates for allowed transitions in Si ii are used to derive theoretical emission-line ratios involving the 3s(2)3p 2P(o)-3s(2)3d 2D, 3s(2)3p 2P(o)-3s3p2 2S, and 3s(2)3p 2P(o)-3s(2)4s 2S multiplets near 1262, 1306, and 1530 angstrom, respectively. A comparison of these line ratios with observational data from a quiet solar region, a sunspot, and an active region, obtained with the High-Resolution Telescope and Spectrograph on board a sounding rocket flight reveals that the 1530 angstrom multiplet is optically thick, which is consistent with a calculation of the optical depth of these lines through a model atmosphere. However, the 1262 and 1306 angstrom multiplets appear to be effectively optically thin. The average discrepancy between the theoretical and observed ratios is congruent-to 40%, which may not be significant, since the estimated uncertainties in both the calculated and experimental data are approximately 30%. C1 QUEENS UNIV BELFAST, DEPT APPL MATH & THEORET PHYS, BELFAST BT7 1NN, ANTRIM, NORTH IRELAND. USN, RES LAB, EO HULBURT CTR SPACE RES, WASHINGTON, DC 20375 USA. RP QUEENS UNIV BELFAST, DEPT PURE & APPL PHYS, BELFAST BT7 1NN, ANTRIM, NORTH IRELAND. NR 34 TC 6 Z9 6 U1 0 U2 0 PU IOP PUBLISHING LTD PI BRISTOL PA TEMPLE CIRCUS, TEMPLE WAY, BRISTOL BS1 6BE, ENGLAND SN 0004-637X EI 1538-4357 J9 ASTROPHYS J JI Astrophys. J. PD MAR 10 PY 1992 VL 387 IS 2 BP 726 EP 731 DI 10.1086/171121 PN 1 PG 6 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA HF938 UT WOS:A1992HF93800027 ER PT J AU LEUCHTNER, RE GRABOWSKI, KS CHRISEY, DB HORWITZ, JS AF LEUCHTNER, RE GRABOWSKI, KS CHRISEY, DB HORWITZ, JS TI ANION-ASSISTED PULSED LASER DEPOSITION OF LEAD ZIRCONATE TITANATE FILMS SO APPLIED PHYSICS LETTERS LA English DT Article ID FERROELECTRIC MEMORIES; DRIFT VELOCITY; ELECTRONS; OXYGEN; 293-K AB A modification of the conventional pulsed laser deposition technique is presented whereby a low energy (less-than-or-equal-to 0.5 eV) electron emitting filament was placed over the substrate during deposition. Using this experimental arrangement, it was possible to deposit oriented films of the ferroelectric perovskite PbZr0.52Ti0.48O3 on [100] MgO substrates at 550-degrees-C. When optimized in terms of emission current, the use of the filament caused a decrease by six orders of magnitude in the ratio of a nonferroelectric pyrochlore phase relative to the ferroelectric perovskite phase. The surface morphology concomitantly changed from porous to essentially smooth as.the electron emission current was increased. The surface reaction of oxygen anions generated by electron attachment to oxygen molecules is believed to be responsible for these crystallographic and morphological changes. RP LEUCHTNER, RE (reprint author), USN,RES LAB,CODE 4670,WASHINGTON,DC 20375, USA. OI Grabowski, Kenneth/0000-0003-0816-001X NR 21 TC 28 Z9 28 U1 0 U2 1 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0003-6951 J9 APPL PHYS LETT JI Appl. Phys. Lett. PD MAR 9 PY 1992 VL 60 IS 10 BP 1193 EP 1195 DI 10.1063/1.107402 PG 3 WC Physics, Applied SC Physics GA HH874 UT WOS:A1992HH87400015 ER PT J AU KENNEDY, ICS JUNE, CH OSHEA, JJ AF KENNEDY, ICS JUNE, CH OSHEA, JJ TI EXPRESSION OF THE HUMAN EPIDERMAL GROWTH-FACTOR RECEPTOR IN A MURINE T-CELL HYBRIDOMA - A TRANSMEMBRANE PROTEIN TYROSINE KINASE CAN SYNERGIZE WITH THE T-CELL ANTIGEN RECEPTOR SO JOURNAL OF BIOLOGICAL CHEMISTRY LA English DT Article ID HUMAN LYMPHOCYTES-T; PHOSPHOLIPASE C-II; SIGNAL TRANSDUCTION; ONCOGENE PRODUCTS; CD4 RECEPTOR; SRC FAMILY; ZETA-CHAIN; PHOSPHORYLATION; ACTIVATION; STIMULATION AB Although the T-cell receptor for antigen (TCR) lacks intrinsic kinase activity, stimulation of this receptor induces tyrosine phosphorylation of multiple substrates. In contrast, the epidermal growth factor receptor (EGFR) has intrinsic cytoplasmic tyrosine kinase catalytic activity that is activated upon EGF binding. To compare the functional effects of the TCR and a transmembrane protein tyrosine kinase (PTK), we used retrovirus-mediated gene transduction to express the human c-erbB proto-oncogene, encoding the EGFR, in a murine T-cell hybridoma. Tyrosine phosphorylation induced by the TCR and the EGFR occurred on substrates unique to each receptor as well as on several shared substrates, including the zeta-chain of the TCR. Stimulation of the EGFR induced calcium ion flux in these cells, suggesting that the heterologous tyrosine kinase can couple to the T-cell phospholipase signal transduction pathway, but this stimulus did not lead to interleukin 2 production. However, EGF stimulation of transduced cells significantly enhanced TCR signaling, as assessed by interleukin 2 production, indicating that cross talk can occur between the TCR and a transmembrane PTK. C1 USN,MED RES INST,IMMUNE CELL BIOL PROGRAM,BETHESDA,MD 20892. RP KENNEDY, ICS (reprint author), NCI,FREDERICK CANC RES & DEV CTR,BIOL RESPONSE MODIFIERS PROGRAM,EXPTL IMMUNOL LAB,FREDERICK,MD 21702, USA. NR 60 TC 7 Z9 7 U1 0 U2 0 PU AMER SOC BIOCHEMISTRY MOLECULAR BIOLOGY INC PI BETHESDA PA 9650 ROCKVILLE PIKE, BETHESDA, MD 20814 SN 0021-9258 J9 J BIOL CHEM JI J. Biol. Chem. PD MAR 5 PY 1992 VL 267 IS 7 BP 4924 EP 4929 PG 6 WC Biochemistry & Molecular Biology SC Biochemistry & Molecular Biology GA HF642 UT WOS:A1992HF64200094 PM 1537871 ER PT J AU TANGREA, JA EDWARDS, BK TAYLOR, PR HARTMAN, AM PECK, GL SALASCHE, SJ MENON, PA BENSON, PM MELLETTE, JR GUILL, MA ROBINSON, JK GUIN, JD STOLL, HL GRABSKI, WJ WINTON, GB AF TANGREA, JA EDWARDS, BK TAYLOR, PR HARTMAN, AM PECK, GL SALASCHE, SJ MENON, PA BENSON, PM MELLETTE, JR GUILL, MA ROBINSON, JK GUIN, JD STOLL, HL GRABSKI, WJ WINTON, GB TI LONG-TERM THERAPY WITH LOW-DOSE ISOTRETINOIN FOR PREVENTION OF BASAL-CELL CARCINOMA - A MULTICENTER CLINICAL-TRIAL SO JOURNAL OF THE NATIONAL CANCER INSTITUTE LA English DT Article ID SKELETAL HYPEROSTOSIS DISH; 13-CIS-RETINOIC ACID; SPINAL HYPEROSTOSIS; ORAL ISOTRETINOIN; ICHTHYOSIS; TOXICITY; ACNE AB Background: High-dose isotretinoin has been reported to have a prophylactic effect on nonmelanoma skin cancer, although it is associated with significant toxicity. Purpose: To test the effectiveness of the long-term administration of low-dose isotretinoin in reducing the occurrence of basal cell carcinoma at a new site in patients with previously treated basal cell carcinomas and to measure the toxicity associated with this regimen, we conducted a clinical trial at eight cancer centers. Methods: Nine hundred and eighty-one patients with two or more previously confirmed basal cell carcinomas were randomly assigned to receive either 10 mg of isotretinoin or a placebo daily. Patients were followed for 36 months and monitored at 6-month intervals for skin cancer and toxic effects. Results: After 36 months of treatment, no statistically significant difference in either the cumulative percent of patients with an occurrence of basal cell carcinoma at a new site or the annual rate of basal cell carcinoma formation existed between patients receiving isotretinoin and those receiving the placebo. Elevated serum triglycerides, hyperostotic axial skeletal changes, and mucocutaneous reactions were more frequent in the group receiving isotretinoin than in the control group, and these differences were all statistically significant (P < .001). Conclusion: This low-dose regimen of isotretinoin not only is ineffective in reducing the occurrence of basal cell carcinoma at new sites in patients with two or more previously treated basal cell carcinomas but also is associated with significant adverse systemic effects. Implication: The toxicity associated with the long-term administration of isotretinoin, even at the low dose used in this trial, must be weighed in planning future prevention trials. C1 EISENHOWER ARMY MED CTR,AUGUSTA,GA. NORTHWESTERN UNIV,CHICAGO,IL 60611. UNIV ARKANSAS,LITTLE ROCK,AR 72204. NEW YORK STATE DEPT HLTH,ROSWELL PK MEM INST,BUFFALO,NY 14263. USN HOSP,PORTSMOUTH,VA. FITZSIMONS ARMY MED CTR,AURORA,CO 80045. NCI,DIV CANC PREVENT & CONTROL,BETHESDA,MD 20892. WALTER REED ARMY MED CTR,WASHINGTON,DC 20307. BROOKE ARMY MED CTR,SAN ANTONIO,TX. NR 35 TC 118 Z9 120 U1 0 U2 4 PU NATL CANCER INSTITUTE PI BETHESDA PA 9030 OLD GEORGETOWN RD, BETHESDA, MD 20814 SN 0027-8874 J9 J NATL CANCER I JI J. Natl. Cancer Inst. PD MAR 4 PY 1992 VL 84 IS 5 BP 328 EP 332 DI 10.1093/jnci/84.5.328 PG 5 WC Oncology SC Oncology GA HU102 UT WOS:A1992HU10200014 PM 1738183 ER PT J AU GOLDBERG, L BUSSE, L MEHUYS, D AF GOLDBERG, L BUSSE, L MEHUYS, D TI BLUE-LIGHT GENERATION BY FREQUENCY DOUBLING OF ALGAAS BROAD AREA AMPLIFIER EMISSION SO APPLIED PHYSICS LETTERS LA English DT Article ID 2ND-HARMONIC GENERATION; DIODE-LASER AB The diffraction limited emission of a traveling wave single pass 600-mu-m wide SQW GaAlAs amplifier injected by a Ti:Sapphire laser was frequency doubled in KNbO3 to generate 400 mW peak power 5-mu-s long pulses of 431 nm light. A maximum single pass frequency conversion efficiency of 6.3% was observed. C1 SPECTRA DIODE LABS,SAN JOSE,CA 95134. RP GOLDBERG, L (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 10 TC 17 Z9 18 U1 0 U2 0 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0003-6951 J9 APPL PHYS LETT JI Appl. Phys. Lett. PD MAR 2 PY 1992 VL 60 IS 9 BP 1037 EP 1039 DI 10.1063/1.106436 PG 3 WC Physics, Applied SC Physics GA HF856 UT WOS:A1992HF85600001 ER PT J AU PROKES, SM GLEMBOCKI, OJ GODBEY, DJ AF PROKES, SM GLEMBOCKI, OJ GODBEY, DJ TI STRESS AND ITS EFFECT ON THE INTERDIFFUSION IN SI1-XGEX/SI SUPERLATTICES SO APPLIED PHYSICS LETTERS LA English DT Article ID HETEROJUNCTION BIPOLAR-TRANSISTORS; MOLECULAR-BEAM EPITAXY; SILICON AB Effects of stress on the interdiffusion behavior in long-period Si0.7Ge0.3/Si is examined using x-ray diffraction and Raman spectroscopy. Symmetrically and asymmetrically strained superlattices have been examined, and an activation energy for interdiffusion of 3.9 and 4.6 eV has been obtained, respectively. Furthermore, an enhanced interdiffusion has been measured for the asymmetrically strained superlattice when subjected to an external tensile stress during annealing. Thus, enhanced intermixing has been measured whenever the Si barrier layers experience tensile stress during annealing. In addition, Raman results confirm the enhancement of Ge diffusion into the Si barriers when annealed under tensile stress. RP PROKES, SM (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 16 TC 42 Z9 43 U1 1 U2 6 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 2 PY 1992 VL 60 IS 9 BP 1087 EP 1089 DI 10.1063/1.107455 PG 3 WC Physics, Applied SC Physics GA HF856 UT WOS:A1992HF85600018 ER PT J AU STARKWEATHER, HW AVAKIAN, P MATHESON, RR FONTANELLA, JJ WINTERSGILL, MC AF STARKWEATHER, HW AVAKIAN, P MATHESON, RR FONTANELLA, JJ WINTERSGILL, MC TI EFFECT OF ABSORBED CHEMICALS ON THE LOW-TEMPERATURE DIELECTRIC-PROPERTIES OF POLY(TETRAFLUOROETHYLENE) SO MACROMOLECULES LA English DT Article ID RELAXATIONS AB Dielectric measurements were made from 5 to 300 K on poly(tetrafluoroethylene) which had been saturated with chloroform, fluorocarbon-113 (1,1,2-trichloro-1,2,2-trifluoroethane), or carbon tetrachloride. The peak height for the gamma-relaxation was increased by the polar additives. In the case of fluorocarbon-113 at frequencies below 1 kHz, it was shifted to lower temperatures with a lower activation energy. In the presence of either of the polar additives, a new relaxation appeared with a maximum in tan-delta at 1 kHz of 49 K for chloroform and 61 K for fluorocarbon-113 in isothermal frequency scans. These relaxations had activation energies of 2-3 kcal/mol and activation entropies close to zero. They are assigned to the reorientation of the absorbed molecules moving independently of each other. In separate measurements on chloroform and fluorocarbon-113, a relaxation was observed at temperatures below their melting points which became weaker after purification. C1 USN ACAD,DEPT PHYS,ANNAPOLIS,MD 21402. RP STARKWEATHER, HW (reprint author), DUPONT CO,EXPT STN,WILMINGTON,DE 19880, USA. NR 11 TC 10 Z9 10 U1 0 U2 1 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0024-9297 J9 MACROMOLECULES JI Macromolecules PD MAR 2 PY 1992 VL 25 IS 5 BP 1475 EP 1479 DI 10.1021/ma00031a018 PG 5 WC Polymer Science SC Polymer Science GA HG439 UT WOS:A1992HG43900018 ER PT J AU MCELVANY, SW ROSS, MM CALLAHAN, JH AF MCELVANY, SW ROSS, MM CALLAHAN, JH TI CHARACTERIZATION OF FULLERENES BY MASS-SPECTROMETRY SO ACCOUNTS OF CHEMICAL RESEARCH LA English DT Article ID CARBON CLUSTER IONS; LASER VAPORIZATION; HYDROCARBONS; COMPLEXES; SHELLS; BEAMS; C-60 C1 USN,RES LAB,DIV CHEM,MASS SPECTROMETRY & ION CHEM SECT,CODE 6113,WASHINGTON,DC 20375. NR 65 TC 94 Z9 94 U1 0 U2 5 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0001-4842 J9 ACCOUNTS CHEM RES JI Accounts Chem. Res. PD MAR PY 1992 VL 25 IS 3 BP 162 EP 168 DI 10.1021/ar00015a010 PG 7 WC Chemistry, Multidisciplinary SC Chemistry GA HJ886 UT WOS:A1992HJ88600011 ER PT J AU MANSFIELD, FA BURGGRAF, OR AF MANSFIELD, FA BURGGRAF, OR TI NUMERICAL INVESTIGATION OF LAMINAR SEPARATED TRAILING-EDGE FLOWS SO AIAA JOURNAL LA English DT Article ID SUPERSONIC-FLOW; FLAT PLATE AB An efficient time-marching numerical method has been developed for solving problems involving supersonic laminar separated trailing-edge flows using a triple-deck formulation. The accuracy of the numerical method was tested for the case of a flat plate embedded in a supersonic flow at angles of incidence below stall. A range of numerical solutions is presented for angles of incidence beyond stall in the form of streamline and shear contour plots. The trailing-edge shear on the side of the plate where separation occurs reaches an asymptotic value as the angle of incidence is increased; beyond this point numerical instability was encountered. C1 OHIO STATE UNIV,DEPT AERO ASTRO ENGN,COLUMBUS,OH 43216. RP MANSFIELD, FA (reprint author), USN,CTR WEAPONS,AERODYNAM BRANCH,CODE 3592,CHINA LAKE,CA 93555, USA. NR 25 TC 0 Z9 0 U1 0 U2 0 PU AMER INST AERONAUT ASTRONAUT PI RESTON PA 1801 ALEXANDER BELL DRIVE, STE 500, RESTON, VA 22091 SN 0001-1452 J9 AIAA J JI AIAA J. PD MAR PY 1992 VL 30 IS 3 BP 577 EP 583 DI 10.2514/3.10959 PG 7 WC Engineering, Aerospace SC Engineering GA HJ908 UT WOS:A1992HJ90800001 ER PT J AU BOWLER, WA HOSTETTLER, C SAMUELSON, D LAVIN, BS OLDFIELD, EC AF BOWLER, WA HOSTETTLER, C SAMUELSON, D LAVIN, BS OLDFIELD, EC TI GASTROINTESTINAL SIDE-EFFECTS OF INTRAVENOUS ERYTHROMYCIN - INCIDENCE AND REDUCTION WITH PROLONGED INFUSION TIME AND GLYCOPYRROLATE PRETREATMENT SO AMERICAN JOURNAL OF MEDICINE LA English DT Article ID MOTILIN; LACTOBIONATE; GASTROPARESIS; BINDING; MUSCLE AB OBJECTIVE: To determine the frequency of gastrointestinal toxicity due to intravenous (IV) erythromycin and to attempt to decrease this toxicity by prolonging the infusion time of erythromycin and/or pretreating with the peripheral anticholinergic, glycopyrrolate 0.1 mg IV. DESIGN: Randomized, double-blind, placebo-controlled trial. SETTING: General medical wards of a tertiary medical center. PATIENTS: A total of 51 hospitalized patients 18 years of age or older who were prescribed IV erythromycin lactobionate (EMLB) 500 mg every 6 hours by their attending physicians. INTERVENTIONS: Each of eight consecutive infusions of EMLB was randomly assigned to one of four groups: control-30-minute infusion/placebo pretreatment; 60/P-60-minute infusion/placebo pretreatment; 30/G-30-minute infusion/glycopyrrolate pretreatment; and 60/G-60-minute infusion/glycopyrrolate pretreatment. MAIN OUTCOME MEASURES: Each infusion was accompanied by a questionnaire in which patients rated the magnitude of nausea and vomiting on a scale of 1 (no toxicity) to 9 (severe toxicity). Scores for both nausea and vomiting were added together for a total toxicity score ranging from 2 to 18. A total score of greater than 8 was defined as clinically important. RESULTS: The 51 patients received a total of 356 infusions with gastrointestinal toxicity occurring in 27 of 51 (53%) patients. Among patients under the age of 40, 22 of 33 (67%) experienced toxicity compared with only five of 18 patients (28%) over the age of 40 (p = 0.018). Clinically important toxicity was seen in 19 of 51 patients (37%), including five who withdrew during the study because of severe nausea and vomiting. In this group, the combination of a 60-minute erythromycin infusion and glycopyrrolate pretreatment decreased clinically important toxicity by 79% from 47% to 10%, a statistically and clinically significant 37% (95% CI, 14% to 60%) difference (p = 0.007). CONCLUSIONS: Gastrointestinal toxicity associated with the IV infusion of erythromycin is common and is more likely to occur in younger patients. A 1-hour infusion of erythromycin combined with pretreatment with glycopyrrolate, 0.1 mg IV, is effective in reducing this toxicity. C1 USN HOSP,DEPT INTERNAL MED,DIV INFECT DIS,SAN DIEGO,CA 92134. USN HOSP,DEPT PHARM,SAN DIEGO,CA 92134. RP BOWLER, WA (reprint author), USN HOSP,DEPT CLIN INVEST,SAN DIEGO,CA 92134, USA. NR 21 TC 10 Z9 11 U1 0 U2 1 PU EXCERPTA MEDICA INC PI NEW YORK PA 245 WEST 17TH STREET, NEW YORK, NY 10011 SN 0002-9343 J9 AM J MED JI Am. J. Med. PD MAR PY 1992 VL 92 IS 3 BP 249 EP 253 DI 10.1016/0002-9343(92)90072-J PG 5 WC Medicine, General & Internal SC General & Internal Medicine GA HH566 UT WOS:A1992HH56600004 PM 1546723 ER PT J AU COLEMAN, DL GALLUP, DG WOLCOTT, HD OTKEN, LB STOCK, RJ AF COLEMAN, DL GALLUP, DG WOLCOTT, HD OTKEN, LB STOCK, RJ TI PATTERNS OF FAILURE OF BULKY-BARREL CARCINOMAS OF THE CERVIX SO AMERICAN JOURNAL OF OBSTETRICS AND GYNECOLOGY LA English DT Article DE CERVICAL CANCER; BULKY-BARREL LESIONS; ADJUVANT HYSTERECTOMY; COMPLICATIONS ID INTACT UTERINE CERVIX; RADIATION-THERAPY; STAGE-IB; EXTRAFASCIAL HYSTERECTOMY; IIA-B; CANCER; IRRADIATION; SURVIVAL; TUMOR AB OBJECTIVE(S): This retrospective study was conducted to analyze the hypothesis that radiation therapy followed by extrafascial hysterectomy would improve survival in patients with bulky-barrel cervical carcinomas. STUDY DESIGN: Forty-three patients with bulky-barrel carcinomas of the cervix were treated over a 14-year period. The majority of these were treated with approximately 4000 cGY external beam, followed by brachytherapy, followed by extrafascial hysterectomy. RESULTS: Forty-seven percent of all patients are dead of disease; 2.3% are alive with disease. Of the total patients, 35% had diseased paraaortic nodes, and 80% of these are dead of disease. Of the patients dead of disease, 80% had distant metastases. Delayed complications included: vesicovaginal fistulas (n = 3), surgery for bowel obstruction (n = 3), rectovaginal fistula (n = 1), and vaginal vault necrosis (n = 3). CONCLUSION: These data do not support an improvement in survival of patients with bulky-barrel-shaped lesions treated with irradiation plus adjunctive hysterectomy. C1 MED COLL GEORGIA,DEPT OBSTET & GYNECOL,GYNECOL ONCOL SECT,AUGUSTA,GA 30912. MED COLL GEORGIA,DEPT PATHOL,AUGUSTA,GA 30912. USN HOSP,PORTSMOUTH,VA. NR 17 TC 12 Z9 12 U1 0 U2 0 PU MOSBY-YEAR BOOK INC PI ST LOUIS PA 11830 WESTLINE INDUSTRIAL DR, ST LOUIS, MO 63146-3318 SN 0002-9378 J9 AM J OBSTET GYNECOL JI Am. J. Obstet. Gynecol. PD MAR PY 1992 VL 166 IS 3 BP 916 EP 920 PG 5 WC Obstetrics & Gynecology SC Obstetrics & Gynecology GA HJ885 UT WOS:A1992HJ88500030 PM 1550164 ER PT J AU LEBAR, RD ALEXANDER, AH AF LEBAR, RD ALEXANDER, AH TI MULTIDIRECTIONAL SHOULDER INSTABILITY - CLINICAL-RESULTS OF INFERIOR CAPSULAR SHIFT IN AN ACTIVE-DUTY POPULATION SO AMERICAN JOURNAL OF SPORTS MEDICINE LA English DT Article AB We reviewed the results of a capsular shift procedure performed on 10 active-duty patients with an average of 28 months followup. Improvement in pain, function, and stability occurred postoperatively in nearly all patients. Loss of total elevation and external rotation were minimal and an average of three spinal segments of internal rotation were lost. Only one patient required further surgery for recurrent instability and all patients except two reported over-all improvement. Dominant shoulders made greater improvements in pain, stability, and functional capacity than nondominant shoulders. Patients with generalized ligamentous laxity had less pain and more posterior instability than those without laxity. A history of an acute traumatic event was predictive of greater improvement in pain and stability. A previous instability repair was indicative of the most postoperative instability and least functional improvement. C1 USN HOSP,DEPT ORTHOPAED SURG,8750 MT BLVD,OAKLAND,CA 94627. NR 0 TC 53 Z9 53 U1 0 U2 0 PU AMER ORTHOPAEDIC SOC SPORT MED PI WALTHAM PA 230 CALVARY STREET, WALTHAM, MA 02154 SN 0363-5465 J9 AM J SPORT MED JI Am. J. Sports Med. PD MAR-APR PY 1992 VL 20 IS 2 BP 193 EP 198 DI 10.1177/036354659202000217 PG 6 WC Orthopedics; Sport Sciences SC Orthopedics; Sport Sciences GA HL834 UT WOS:A1992HL83400016 PM 1558248 ER PT J AU HARROD, FS AF HARROD, FS TI ADMIRALS OF THE NEW-STEEL NAVY - MAKERS OF THE AMERICAN NAVAL TRADITION, 1880-1930 - BRADFORD,JC SO AMERICAN NEPTUNE LA English DT Book Review RP HARROD, FS (reprint author), USN ACAD,ANNAPOLIS,MD 21402, USA. NR 1 TC 0 Z9 0 U1 0 U2 0 PU PEABODY MUSEUM PI SALEM PA E INDIA MARINE HALL, SALEM, MA 01970 SN 0003-0155 J9 AM NEPTUNE JI Am. Neptune PD SPR PY 1992 VL 52 IS 2 BP 136 EP 137 PG 2 WC History SC History GA HW889 UT WOS:A1992HW88900008 ER PT J AU UHLMANN, JK AF UHLMANN, JK TI ALGORITHMS FOR MULTIPLE-TARGET TRACKING SO AMERICAN SCIENTIST LA English DT Article C1 UNIV MISSOURI,COLUMBIA,MO 65201. RP UHLMANN, JK (reprint author), USN,RES LAB,CODE 5570,WASHINGTON,DC 20375, USA. NR 7 TC 47 Z9 59 U1 0 U2 4 PU SIGMA XI-SCI RES SOC PI RES TRIANGLE PK PA PO BOX 13975, RES TRIANGLE PK, NC 27709 SN 0003-0996 J9 AM SCI JI Am. Scientist PD MAR-APR PY 1992 VL 80 IS 2 BP 128 EP 141 PG 14 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA HL862 UT WOS:A1992HL86200011 ER PT J AU KAESTNER, R SOLNICK, L AF KAESTNER, R SOLNICK, L TI EMPLOYEE WAGE GROWTH WITHIN THE FIRM - A DEFERRED PAYMENT OR HUMAN-CAPITAL INVESTMENT SO APPLIED ECONOMICS LA English DT Article ID PRODUCTIVITY; TURNOVER; EARNINGS AB An analysis of the relationship between seniority and wages within a large US manufacturing firm is presented. Firm specific information is used to infer the ability level of employees. Knowledge of employee ability is essential in devising tests of the 'deferred payment scheme' and 'human capital' models of wage growth. Hypotheses regarding the ways in which the returns to seniority are expected to vary across the firm hierarchy were constructed and empirically tested. The results appear to lend some support to the 'deferred payment scheme' model, and to be inconsistent with the predictions of the simple 'human capital' model. C1 NAVAL POST GRAD SCH,DEPT ADM SCI,MONTEREY,CA 93943. RP KAESTNER, R (reprint author), RIDER COLL,DEPT ECON,LAWRENCEVILLE,NJ 08648, USA. NR 18 TC 0 Z9 0 U1 0 U2 0 PU ROUTLEDGE PI LONDON PA 11 NEW FETTER LANE, LONDON, ENGLAND EC4P 4EE SN 0003-6846 J9 APPL ECON JI Appl. Econ. PD MAR PY 1992 VL 24 IS 3 BP 347 EP 361 DI 10.1080/00036849200000148 PG 15 WC Economics SC Business & Economics GA HE516 UT WOS:A1992HE51600009 ER PT J AU COBB, MW DOMLOGEHULTSCH, N FRAME, JN YANCEY, KB AF COBB, MW DOMLOGEHULTSCH, N FRAME, JN YANCEY, KB TI WALDENSTROM MACROGLOBULINEMIA WITH AN IGM-KAPPA ANTIEPIDERMAL BASEMENT-MEMBRANE ZONE ANTIBODY SO ARCHIVES OF DERMATOLOGY LA English DT Article ID CUTANEOUS MANIFESTATIONS; CHRONIC URTICARIA; SKIN AB Background. -Waldenstrom macroglobulinemia, a lymphoplasmacytoid cell malignant neoplasm associated with a monoclonal IgM paraprotein, has been associated with a number of cutaneous manifestations. On rare occasions, IgM deposits have been demonstrated in the epidermal basement zone of patients with WM. Observations. -We report the case of a patient with Waldenstrom macroglobulinemia and IgM-kappa paraprotein who had development of an eruption of pruritic papules and demonstrated the following unusual immunopathologic findings: (1) deposits of IgM-kappa in the epidermal basement membrane zone of lesional and nonlesional skin; (2) a circulating IgM-kappa antiepidermal basement membrane zone antibody; and (3) binding of this circulating IgM-kappa antiepidermal basement membrane zone antibody to both sides of 1 mol/L sodium chloride split skin. The cutaneous eruption cleared completely with oral psoralen with long-wave UV radiation in the A range (PUVA) therapy. Conclusions. -We present a patient with Waldenstrom macroglobulinemia who had a distinctive papular eruption and immunopathologic findings suggesting that his paraprotein has specificity for the epidermal basement membrane zone. C1 USN,NATL MED CTR,DEPT MED,DIV HEMATOL MED ONCOL,BETHESDA,MD 20899. UNIFORMED SERV UNIV HLTH SCI,DEPT DERMATOL,BETHESDA,MD 20814. RP COBB, MW (reprint author), USN,NATL MED CTR,DEPT DERMATOL,BETHESDA,MD 20899, USA. FU NIAMS NIH HHS [AR37446] NR 18 TC 18 Z9 18 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 1992 VL 128 IS 3 BP 372 EP 376 DI 10.1001/archderm.128.3.372 PG 5 WC Dermatology SC Dermatology GA HH855 UT WOS:A1992HH85500010 PM 1550370 ER PT J AU DOYLE, R AF DOYLE, R TI THE DEFENSE REVOLUTION, STRATEGY FOR THE BRAVE-NEW-WORLD BY AN ARMS CONTROLLER AND AN ARMS BUILDER - ADELMAN,K, AUGUSTINE,N SO ARMED FORCES & SOCIETY LA English DT Book Review RP DOYLE, R (reprint author), USN,POSTGRAD SCH,WASHINGTON,DC 20350, 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 1992 VL 18 IS 3 BP 422 EP 424 DI 10.1177/0095327X9201800310 PG 3 WC Political Science; Sociology SC Government & Law; Sociology GA HR218 UT WOS:A1992HR21800010 ER PT J AU KASSIM, NE AF KASSIM, NE TI 330-MHZ VLA OBSERVATIONS OF 20-GALACTIC SUPERNOVA-REMNANTS SO ASTRONOMICAL JOURNAL LA English DT Article ID RADIO-CONTINUUM OBSERVATIONS; HIGH-RESOLUTION RADIO; X-RAY OBSERVATIONS; NOVA REMNANTS; GALACTIC PLANE; WAVELENGTH; SPECTRUM; W28 AB We present 330 MHz images and integrated flux densities for 20 previously identified 1st quadrant Galactic Supernova Remnants (SNRs). The observations were made in the D configuration of the VLA giving an angular resolution of approximately 3' and providing good sensitivity to extended structure. Such emission, particularly if it is nonthermal, might be missed on higher frequency surveys due to confusion with the Galactic background and confusion with thermal sources in complex regions. Both problems are reduced by interferometric observations at this lower frequency. The flux densities presented can be used to anchor the low frequency end of the radio spectra of these sources, which are often poorly determined by previous observations at both high and low frequencies. The measurements presented here are also useful for distinguishing steeper spectrum shell-type emission from flatter spectrum plerionic emission for SNRs whose intrinsic morphological type is not well established. RP KASSIM, NE (reprint author), USN,RES LAB,CTR ADV SPACE SENSING,CODE 42153,WASHINGTON,DC 20375, USA. NR 44 TC 54 Z9 54 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 1992 VL 103 IS 3 BP 943 EP 952 DI 10.1086/116116 PG 10 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA HE673 UT WOS:A1992HE67300023 ER PT J AU CERRUTISOLA, M CHENG, CC PALLAVICINI, R AF CERRUTISOLA, M CHENG, CC PALLAVICINI, R TI MG-II ABSOLUTE LINE-PROFILES FOR LATE-TYPE STARS AND FOR SPATIALLY-RESOLVED SOLAR REGIONS SO ASTRONOMY & ASTROPHYSICS LA English DT Article DE STARS, CHROMOSPHERES; SUN, CHROMOSPHERE; UV RADIATION; SPECTROSCOPY ID LOCAL INTERSTELLAR-MEDIUM; STELLAR ANGULAR DIAMETERS; VISUAL SURFACE BRIGHTNESS; MAIN-SEQUENCE STARS; COOL STARS; MAGNETIC-STRUCTURE; ULTRAVIOLET EMISSION; SPECTRAL TYPES; IUE; GIANTS AB We present the results of a comparison of Mg II h and k line profiles and fluxes for late-type stars observed with IUE and for spatially resolved solar regions observed at comparable resolution by the NRL Spectrograph on Skylab. We show that the spatially resolved solar observations are in good agreement with the disk integrated stellar observations, thus suggesting that different Mg II emission levels observed in stars of similar spectral type are due to different fractions of their surface covered by magnetic regions. We confirm that the Mg II stellar fluxes are well correlated with other chromospheric and transition-region fluxes, and we show that the spatially resolved solar data obey the same flux-flux relationships as the stellar data with virtually the same slope. We compare some important line diagnostic parameters (k/h, DELTA-k-1, DELTA-k-2, and FWHM of the k line) in disk integrated stellar data and in spatially resolved solar regions, finding no significant discrepancies between the two cases. Finally, we discuss the possibility and limitations of using the comparison of solar and stellar Mg II fluxes to infer the fraction of a star's surface covered by magnetic regions. C1 OSSERV ASTROFIS ARCETRI, LARGO E FERMI 5, I-50125 FLORENCE, ITALY. USN, RES LAB, EO HULBURT CTR SPACE RES, WASHINGTON, DC 20375 USA. NR 39 TC 13 Z9 13 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 MAR PY 1992 VL 256 IS 1 BP 185 EP 194 PG 10 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA HH020 UT WOS:A1992HH02000026 ER PT J AU REIPURTH, B HEATHCOTE, S VRBA, F AF REIPURTH, B HEATHCOTE, S VRBA, F TI STAR FORMATION IN BOK GLOBULES AND LOW-MASS CLOUDS .4. HERBIG-HARO OBJECTS IN B335 SO ASTRONOMY & ASTROPHYSICS LA English DT Article DE HERBIG-HARO OBJECTS; INTERSTELLAR MEDIUM, CLOUDS, B335; STARS, FORMATION OF; STARS, PRE-MAIN SEQUENCE ID DARK CLOUDS; YOUNG STARS; OUTFLOW; DYNAMICS; FLOWS; B-335; JET AB An H-alpha emission knot, discovered by Vrba et al. (1986) in the Bok globule B335, is here confirmed as a bona fide Herbig-Haro object, HH 119B. In addition, we have found two more HH objects, all of which form a highly collimated HH complex emanating from the embedded far-infrared source. The axis of the HH-flow coincides with that of the molecular outflow. HH 119B is a low-excitation object, whereas HH 119A, formed as a bow shock further away from the source, has higher excitation. Both are located in the red lobe of the molecular outflow. HH 119C is situated near the opposite edge of the Bok globule, in the blue lobe of the outflow. The proper motions of HH 119B and C have been measured, and show that the Herbig-Haro objects move away from the source in opposite directions along the bipolar molecular outflow with a velocity of about 200 km s-1, at our assumed distance of 250 pc. This chain of HH-objects suggests that the embedded energy-source has experienced several outbursts, the most recent of which were approximately 350 and 850 years ago. We relate these outbursts to FU Orionis type eruptions due to accretion events in a circumstellar disk. C1 NATL OPT ASTRON OBSERV, CERRO TOLOLO INT OBSERV, LA SERENA, CHILE. USN OBSERV, FLAGSTAFF STN, FLAGSTAFF, AZ 86002 USA. RP REIPURTH, B (reprint author), EUROPEAN SO OBSERV, CASILLA 19001, SANTIAGO 19, CHILE. NR 26 TC 26 Z9 26 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 MAR PY 1992 VL 256 IS 1 BP 225 EP 230 PG 6 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA HH020 UT WOS:A1992HH02000030 ER PT J AU MAUERSBERGER, R WILSON, TL MEZGER, PG GAUME, R JOHNSTON, KJ AF MAUERSBERGER, R WILSON, TL MEZGER, PG GAUME, R JOHNSTON, KJ TI THE INTERNAL STRUCTURE OF MOLECULAR CLOUDS .3. EVIDENCE FOR MOLECULAR DEPLETION IN THE NGC-2024 CONDENSATIONS SO ASTRONOMY & ASTROPHYSICS LA English DT Article DE INTERSTELLAR MEDIUM, MOLECULES; DUST; CLOUDS, NGC 2024; FORMATION OF STARS ID LINE OBSERVATIONS; DUST EMISSION; NGC 2024; ORION-B; ABUNDANCES; REGION; OXYGEN; CORES; MAPS; GAS AB Maps of the star forming region NGC 2024 in the mm-wave transitions of (CS)-S-34, (CO)-O-17 and (CO)-O-18, obtained at the IRAM 30-m telescope, with angular resolutions of 21" to 12" are presented. Using the Very Large Array, NGC2024 has been imaged in the (J,K) = (1,1) and (2,2) inversion lines of NH3 and the lambda = 1.3 cm continuum with a resolution of 3". The mm-wave dust emission peaks NGC2024:FIR 1 to 7 reported by Mezger et al. (1988, 1992) to be candidates for protostellar objects are not seen in (CO)-O-18. The contrast in the (CS)-S-34 maps is similar to that found in dust emission, but positions and angular sizes of the maxima do not agree very well. The emission of the CS and CO isotopes arises from a ridge which has a minimum coinciding with two crescent shaped regions of free-free emission, the northern continuum peak (NCP) and the southern continuum peak (SCP). This ridge has a counterpart in the dust emission. For each of the compact dust emission maxima FIR 1 to 7, we find a corresponding compact NH3 source with good positional agreement. The sizes and orientations of the NH3 peaks are similar to the values derived for the dust emission peaks with the exception of FIR/NH3 4 and 5 where the NH3 emission arises from a smaller area. From a comparison with single dish data, the bulk of the NH3 emission must come from the more extended molecular ridge rather than from the compact condensations. Only for NH3/FIR 4 and 5 are kinetic temperatures derived from ammonia greater-than-or-equal-to 40K. For the other NH3 cores T(kin) is < 18 K to 23 K. This is significantly colder than the molecular ridge, where the the kinetic temperature is greater-than-or-similar-to 30 K and implies that those dust continuum peaks are column density maxima rather than temperature maxima. Toward FIR 1, 2, 3, 6, and 7, the linewidths of the ammonia profiles are much smaller than those of single dish CS or CO isotopes, and lead to virial masses which are approximately 1/10 the masses determined from the dust continuum emission. The average relative abundance of NH3, calculated from the virial masses is greater-than-or-similar-to 10(-9). It is even lower for the molecular regions NH3/FIR 4 and 5, nearest the NCP and SCP. If the models of grain emission properties are not seriously in error, our data imply that for the medium density ridge, molecules are abundant in gas phase. This leads to similar H-2 column density estimates from dust and from molecules. NH3 emission might arise merely from part of the surface of the compact condensations; the cold, dense gas phase environment of the condensations is, however, devoid of NH3 and other polar molecules. One explanation is to postulate large dust/gas temperature gradients in the FIR sources and a chemical destruction of NH3 and CS, which would imply that stars are already present in the condensations. (CO)-O-18 is, however, not affected by such chemistry, which makes it more straightforward that the molecules are depleted due to freezing out onto grain surfaces. C1 IRAM, E-18012 GRANADA, SPAIN. USN, RES LAB, WASHINGTON, DC 20375 USA. RP MAUERSBERGER, R (reprint author), MAX PLANCK INST RADIOASTRON, HUGEL 69, W-5300 BONN 1, GERMANY. NR 34 TC 74 Z9 74 U1 0 U2 1 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 MAR PY 1992 VL 256 IS 2 BP 640 EP 651 PG 12 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA HL037 UT WOS:A1992HL03700040 ER PT J AU BOHNKER, BK AF BOHNKER, BK TI PERFORMANCE EVALUATION IMPAIRMENT PRIOR TO HIV SEROPOSITIVE DIAGNOSIS - A PRELIMINARY NAVY POPULATION-BASED STUDY SO AVIATION SPACE AND ENVIRONMENTAL MEDICINE LA English DT Note ID HUMAN-IMMUNODEFICIENCY-VIRUS; AIDS DEMENTIA COMPLEX; NEUROLOGICAL COMPLICATIONS; INFECTION; MANIFESTATIONS; INDIVIDUALS; PREVALENCE; DISORDERS; COHORT AB Significant work problems were noted in two U.S. Navy personnel immediately prior to being found Human Immunodeficiency Virus (HIV) seropositive. This finding suggested a preliminary study on performance evaluation impairment prior to HIV seropositive diagnosis. Cases studied were 75 (of a possible 82 available) HIV seropositive male sailors in the E-6 paygrade identified in 1987. One-sided analysis was conducted on categories from Navy performance evaluation reports prior to diagnosis, with controls' frequency matched for Rate, Rank, Date of Rank, Race, and Male sex (N = 71). The cases were significantly lower for Personal Behavior (OR = 2.04, p = 0.038 one-sided) and Overall (OR = 1.80, p = 0.048 one-sided). After adjustment by logistic regression for sea-shore duty, significant impairment was demonstrated for Personal Behavior (OR = 5.76, p = 0.002 one sided, with significant interaction p = 0.014), Reliability (OR = 2.89, p = 0.024 one-sided), and Overall (OR = 2.47 p = 0.036 one-sided). These findings suggest further studies on performance evaluation impairment prior to HIV seropositive diagnosis. RP BOHNKER, BK (reprint author), USN,USS FORRESTAL CV-59,DIV H,FPO,MIAMI,FL 34080, USA. NR 28 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 1992 VL 63 IS 3 BP 212 EP 218 PG 7 WC Public, Environmental & Occupational Health; Medicine, General & Internal; Sport Sciences SC Public, Environmental & Occupational Health; General & Internal Medicine; Sport Sciences GA HF149 UT WOS:A1992HF14900010 PM 1567324 ER PT J AU MONROY, RL SKELLY, RR DAVIS, TA MACVITTIE, TJ AF MONROY, RL SKELLY, RR DAVIS, TA MACVITTIE, TJ TI THERAPEUTIC EVALUATION OF INTERLEUKIN-1 FOR STIMULATION OF HEMATOPOIESIS IN PRIMATES AFTER AUTOLOGOUS BONE-MARROW TRANSPLANTATION SO BIOTHERAPY LA English DT Article DE HEMATOPOIESIS; IL-1; PLATELETS; PRIMATES; TRANSPLANTATION ID NECROSIS FACTOR-ALPHA; GRANULOCYTE-MACROPHAGE; MEGAKARYOCYTE DEVELOPMENT; ENDOTHELIAL-CELLS; GROWTH-FACTORS; FACTOR INVIVO; STEM-CELL; GM-CSF; MICE; RECOVERY AB A multiple dose IL-1 therapy was evaluated for its capability to stimulate hematopoiesis in normal primates and to restore hematopoiesis after autologous bone marrow transplantation. The administration of IL-1 to normal animals over a dose range of 0.5 to 10 ug/kg/d led to a 7-12 fold increase in peripheral blood neutrophil and monocyte counts after 24 hours. This increase in the mature peripheral blood myeloid cells was followed by changes in the myeloid composition of the bone marrow, where the percentage of myeloid elements increased along with a transient increase in myeloid progenitor cell activity. IL-1 treatment also led to an initial decrease in platelet counts of 10-30% during the first 3 days of treatment. However, a striking finding was a significant and long lasting stimulation of increased platelet production with platelet counts increasing to 77% of baseline 3 days after cessation of treatment and remaining elevated for the next 10 days. The therapeutic potential of the IL-1 regimen to restore hematopoiesis was further evaluated in an established autologous bone marrow transplantation model. In monkeys receiving IL-1 doses, 1.0 and 5.0 ug/kg/d, neutrophil counts recovered to > 0.5 x 10e9/l on day 16, one day earlier than control, but the recovery to baseline neutrophil counts occurred 5 days sooner than control. IL-1 therapy had its greatest effect on the restoration of platelet counts after transplantation, reaching > 100 x 10e9/l by day 21, two weeks earlier than control. This work demonstrates that IL-1 therapy stimulates myelopoiesis but its most promising clinical application is the stimulation of platelet production. C1 ARMED FORCES RADIOBIOL RES INST,DEPT EXPTL HEMATOL,BETHESDA,MD 20889. RP MONROY, RL (reprint author), USN,MED RES INST,DEPT IMMUNOBIOL & TRANSPLANTAT,BETHESDA,MD 20889, USA. NR 42 TC 7 Z9 7 U1 0 U2 0 PU KLUWER ACADEMIC PUBL PI DORDRECHT PA SPUIBOULEVARD 50, PO BOX 17, 3300 AA DORDRECHT, NETHERLANDS SN 0921-299X J9 BIOTHERAPY JI Biotherapy PD MAR PY 1992 VL 4 IS 2 BP 97 EP 108 DI 10.1007/BF02171754 PG 12 WC Biochemistry & Molecular Biology; Cell Biology; Medicine, Research & Experimental SC Biochemistry & Molecular Biology; Cell Biology; Research & Experimental Medicine GA HK081 UT WOS:A1992HK08100003 PM 1622737 ER PT J AU SHANNON, KM WATTERSON, J JOHNSON, P OCONNELL, P LANGE, B SHAH, N STEINHERZ, P KAN, YW PRIEST, JR AF SHANNON, KM WATTERSON, J JOHNSON, P OCONNELL, P LANGE, B SHAH, N STEINHERZ, P KAN, YW PRIEST, JR TI MONOSOMY-7 MYELOPROLIFERATIVE DISEASE IN CHILDREN WITH NEUROFIBROMATOSIS, TYPE-1 - EPIDEMIOLOGY AND MOLECULAR ANALYSIS SO BLOOD LA English DT Article ID CHRONIC MYELOGENOUS LEUKEMIA; CHRONIC GRANULOCYTIC-LEUKEMIA; BONE-MARROW MONOSOMY-7; BARR VIRUS-INFECTION; VONRECKLINGHAUSEN NEUROFIBROMATOSIS; WILMS TUMOR; GENE; CHILDHOOD; MUTATIONS; PROTEIN C1 USN HOSP,DEPT PEDIAT,OAKLAND,CA. UNIV CALIF SAN FRANCISCO,DEPT LAB MED,SAN FRANCISCO,CA 94143. UNIV CALIF SAN FRANCISCO,HOWARD HUGHES MED INST,SAN FRANCISCO,CA 94143. CHILDRENS HOSP,DEPT HEMATOL ONCOL,ST PAUL,MN. CHILDRENS HOSP,DEPT PATHOL,ST PAUL,MN. UNIV TEXAS,HLTH SCI CTR,DEPT PATHOL,SAN ANTONIO,TX 78284. CHILDRENS HOSP,DIV ONCOL,PHILADELPHIA,PA 19104. GEISINGER MED CTR,DEPT HEMATOL ONCOL,DANVILLE,PA 17822. MEM SLOAN KETTERING CANC CTR,DEPT PEDIAT,NEW YORK,NY 10021. NR 54 TC 96 Z9 96 U1 0 U2 0 PU W B SAUNDERS CO PI PHILADELPHIA PA INDEPENDENCE SQUARE WEST CURTIS CENTER, STE 300, PHILADELPHIA, PA 19106-3399 SN 0006-4971 J9 BLOOD JI Blood PD MAR 1 PY 1992 VL 79 IS 5 BP 1311 EP 1318 PG 8 WC Hematology SC Hematology GA HF638 UT WOS:A1992HF63800029 PM 1536955 ER PT J AU ELSBERRY, RL HOLLAND, GJ GERRISH, H DEMARIA, M GUARD, CP EMANUEL, K AF ELSBERRY, RL HOLLAND, GJ GERRISH, H DEMARIA, M GUARD, CP EMANUEL, K TI IS THERE ANY HOPE FOR TROPICAL CYCLONE INTENSITY PREDICTION - A PANEL DISCUSSION SO BULLETIN OF THE AMERICAN METEOROLOGICAL SOCIETY LA English DT Discussion AB The outlook tor tropical cyclone intensity forecasts from operational and from research perspectives was discussed during a panel discussion at the 19th Conference on Hurricanes and Tropical Meteorology. Whereas the operational requirement at the National Hurricane Center is to predict maximum 1-min sustained wind speeds at specific locations, the research community is addressing the prediction of the maximum wind or minimum sea level pressure in the storm. Commonality was found in the forecast strategies for subjectively predicting storm intensity. The panelists suggested improvements may be gained from additional observations, better conceptual and theoretical models of storm structure and behavior, and enhancements in statistical and numerical models. The discussion period brought out opposing viewpoints on a number of topics. Both new observations and better use of the existing observations were believed to be necessary. The limitations and advantages of remotely sensed data for this problem were raised. The most vigorous debates were on the physical processes, such as existence or nonexistence of coupling between outer and inner core structure, and whether convection is simply a response to forcing or is an essential contributor to uncertainty in intensity forecasting. Several participants suggested that uncertainties related to the sea surface temperature and its evolution also contribute to the intensity forecast problem. Some specific suggestions for improving intensity forecasts are given in terms of new observations, new basic understandings, and new applied developments. C1 BUR METEOROL,RES CTR,MELBOURNE,AUSTRALIA. NATL HURRICANE CTR,CORAL GABLES,FL. HURRICANE RES DIV,MIAMI,FL. MIT,CAMBRIDGE,MA 02139. RP ELSBERRY, RL (reprint author), USN,POSTGRAD SCH,DEPT METEOROL,CODE MR-ES,MONTEREY,CA 93943, USA. RI DeMaria, Mark/F-5583-2010 NR 10 TC 34 Z9 37 U1 0 U2 5 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 1992 VL 73 IS 3 BP 264 EP 275 PG 12 WC Meteorology & Atmospheric Sciences SC Meteorology & Atmospheric Sciences GA HK902 UT WOS:A1992HK90200001 ER PT J AU MILLIKEN, J DOMINGUEZ, DD NELSON, HH BARGER, WR AF MILLIKEN, J DOMINGUEZ, DD NELSON, HH BARGER, WR TI INCORPORATION OF C-60 IN LANGMUIR-BLODGETT-FILMS SO CHEMISTRY OF MATERIALS LA English DT Note ID CARBON RP MILLIKEN, J (reprint author), USN,RES LAB,DIV CHEM,CODE 6100,WASHINGTON,DC 20375, USA. NR 13 TC 86 Z9 86 U1 0 U2 0 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-APR PY 1992 VL 4 IS 2 BP 252 EP 254 DI 10.1021/cm00020a005 PG 3 WC Chemistry, Physical; Materials Science, Multidisciplinary SC Chemistry; Materials Science GA HL702 UT WOS:A1992HL70200005 ER PT J AU HONG, SY KERTESZ, M LEE, YS KIM, OK AF HONG, SY KERTESZ, M LEE, YS KIM, OK TI ELECTRONIC-STRUCTURES OF HETEROCYCLIC LADDER POLYMERS - POLYPHENOTHIAZINE, POLYPHENOXAZINE, AND POLYPHENOQUINOXALINE SO CHEMISTRY OF MATERIALS LA English DT Article ID CHARGE-TRANSFER; ELECTRICAL-CONDUCTIVITY; CARBON SKELETONS; GROUND-STATES; POLYACETYLENE; POLYACENE; ABINITIO; MNDO; POLY(2,5-THIENYLENE); POLYPARAPHENYLENE AB Geometrical and electronic structures of three heterocyclic ladder polymers, polyphenothiazine (PTL), polyphenoxazine (POL), and polyphenoquinoxaline (PQL), were investigated with the extended Huckel crystal orbital method. Fully optimized geometries were obtained by total energy calculations using the solid-state version of the modified neglect of diatomic overlap (MNDO) method. Two types of bandgaps were found: one at the Brillouin zone edge arising from a Peierls distortion and the other at the center of the Brillouin zone (k = 0) due to heteroatomic perturbations. The bandgap at the Fermi level, E(F), is due to Peierls distortion and is small, 0.3-0.5 eV, which reflects the experimentally observed substantial conductivity (10(-6) 10(-5) OMEGA-1 cm-1) of pristine PTL. At high doping levels (charge transfer of around +/- 0.8e/unit cell), the Peierls gaps are predicted to disappear, but the gaps due to heteroatoms are essentially unchanged. Therefore, the heteroatoms are responsible for certain experimental observations: short electron delocalization lengths in ladder polymers as determined by N-14 electron nuclear double resonance measurements, and only a small (2-4 orders of magnitude) increase in conductivity and spin concentrations of doped PTL. From the assignments of band symmetries, it is found that a transition between highest occupied band and lowest unoccupied band is IR active in a high-frequency region (> ca. 3000 cm-1) and that two direct optical transitions (B(g) <-- A(u)) from the Fermi level to the higher conduction bands can occur in the visible range as observed experimentally from the quinoid form of triphenodithiazine. C1 GEORGETOWN UNIV,DEPT CHEM,WASHINGTON,DC 20057. USN,RES LAB,DIV CHEM,WASHINGTON,DC 20375. RI Kertesz, Miklos/E-7122-2010 OI Kertesz, Miklos/0000-0002-7930-3260 NR 45 TC 38 Z9 39 U1 0 U2 6 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-APR PY 1992 VL 4 IS 2 BP 378 EP 383 DI 10.1021/cm00020a027 PG 6 WC Chemistry, Physical; Materials Science, Multidisciplinary SC Chemistry; Materials Science GA HL702 UT WOS:A1992HL70200027 ER PT J AU DECKER, CF TIERNAN, R PAPARELLO, SF AF DECKER, CF TIERNAN, R PAPARELLO, SF TI ESOPHAGEAL CANDIDIASIS ASSOCIATED WITH ACUTE INFECTION DUE TO HUMAN-IMMUNODEFICIENCY-VIRUS SO CLINICAL INFECTIOUS DISEASES LA English DT Letter ID PRIMARY HIV INFECTION C1 USN HOSP, DEPT INTERNAL MED, JACKSONVILLE, FL USA. RP DECKER, CF (reprint author), NATL NAVAL MED CTR, DIV INFECT DIS, HIV EVALUAT UNIT, BETHESDA, MD 20889 USA. NR 4 TC 7 Z9 7 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 MAR PY 1992 VL 14 IS 3 BP 791 EP 791 PG 1 WC Immunology; Infectious Diseases; Microbiology SC Immunology; Infectious Diseases; Microbiology GA HE701 UT WOS:A1992HE70100030 PM 1562676 ER PT J AU MANSFELD, F TSAI, R SHIH, H LITTLE, B RAY, R WAGNER, P AF MANSFELD, F TSAI, R SHIH, H LITTLE, B RAY, R WAGNER, P TI AN ELECTROCHEMICAL AND SURFACE ANALYTICAL STUDY OF STAINLESS-STEELS AND TITANIUM EXPOSED TO NATURAL SEAWATER SO CORROSION SCIENCE LA English DT Article ID IMPEDANCE SPECTROSCOPY; CORROSION BEHAVIOR; OXYGEN REDUCTION; PASSIVATION; BIOFILMS; ALLOYS AB Samples of three stainless steels and titanium grade 2 were exposed to flowing seawater at Port Hueneme, California under natural and reduced light environments. A total of four sets of samples were exposed for times up to 120 days. Open-circuit potential (E(corr)) and electrochemical impedance data as a function of exposure time were used to monitor the electrochemical behavior of the four materials. Surface examination showed a gradual increase in coverage by the biofilm as a function of exposure time. A small increase of E(corr) was observed, independent of exposure conditions and similar in magnitude to that observed in an abiotic, synthetic salt solution. Impedance data remained capacitive over the entire test period. Capacitance values were similar in natural and synthetic seawater. Localized corrosion was not observed for any sample. Pitting scans in 3.5% NaCl, performed as a function of pH, showed that the pitting potential of 304 stainless steel (SS) reached a value of about 0 mV at pH = 2. C1 USN,OCEANOG & ATMOSPHER RES LAB,BIOL & CHEM OCEANOG BRANCH,STENNIS SPACE CTR,MS 39529. RP MANSFELD, F (reprint author), UNIV SO CALIF,DEPT MAT SCI & ENGN,CORROS & ENVIRONM EFFECTS LAB,LOS ANGELES,CA 90089, USA. NR 28 TC 21 Z9 23 U1 3 U2 6 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0010-938X J9 CORROS SCI JI Corrosion Sci. PD MAR PY 1992 VL 33 IS 3 BP 445 EP 456 DI 10.1016/0010-938X(92)90073-C PG 12 WC Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Materials Science; Metallurgy & Metallurgical Engineering GA HD692 UT WOS:A1992HD69200010 ER PT J AU ABRAHAM, KM ALAMGIR, M WILLSTAEDT, EB KILROY, WP AF ABRAHAM, KM ALAMGIR, M WILLSTAEDT, EB KILROY, WP TI METAL PHTHALOCYANINE-CATALYZED LI/SOCL2 CELLS SO ELECTROCHIMICA ACTA LA English DT Article DE LITHIUM BATTERY; CATALYSIS; THIONYL CHLORIDE ID REDUCTION AB The discharge capacity and voltage of Li/SOCl2 cells were investigated as a function of doping the carbon cathode with transition and non-transition metal phthalocyanines (M-Pcs). The nature of the metal atom and the sintering temperature of the carbon/metal complex mixture were identified as the two important factors affecting catalytic activity. M-Pcs in which M is a transition metal such as Co, Ni, V, Cu and Mn are catalytically active while non-transition metals such as Li, Zn and Mg are inactive. Analytical data obtained with Co-Pc could be modelled in terms of the following processes during sintering of a carbon/M-Pc mixture. A "strongly adsorbed M-Pc/carbon catalyst" is first formed during sintering at about 600-degrees-C. This catalyst improves both the capacity and voltage of the Li/SOCl2 cell. Increasing the sintering temperature to 800-degrees-C appears to cause the decomposition of the metal macrocycle accompanied by chemical bonding of the metal to the carbon through an oxygen or a nitrogen. This catalyst primarily increases the voltages of the cell with only minor improvement of cell capacity. C1 USN,CTR SURFACE WARFARE,DIV MAT,ELECTROCHEM BRANCH,SILVER SPRING,MD 20903. RP ABRAHAM, KM (reprint author), EIC LABS INC,111 DOWNEY ST,NORWOOD,MA 02062, USA. NR 17 TC 11 Z9 15 U1 1 U2 5 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0013-4686 J9 ELECTROCHIM ACTA JI Electrochim. Acta PD MAR PY 1992 VL 37 IS 3 BP 531 EP 543 DI 10.1016/0013-4686(92)87046-3 PG 13 WC Electrochemistry SC Electrochemistry GA GY646 UT WOS:A1992GY64600023 ER PT J AU LIGRANI, PM SUBRAMANIAN, CS COUMES, TM GRECO, FJ KOTH, H LONGEST, JM AF LIGRANI, PM SUBRAMANIAN, CS COUMES, TM GRECO, FJ KOTH, H LONGEST, JM TI STUDY OF THE IMPOSITION OF BULK FLOW PULSATIONS ON PLANE CHANNEL FLOW AT MODERATE STOKES NUMBERS SO EXPERIMENTAL THERMAL AND FLUID SCIENCE LA English DT Article DE PLANE CHANNEL FLOW; BULK FLOW PULSATIONS; TRANSITION FLOW; ORGANIZED MOTIONS ID OSCILLATORY PIPE-FLOW; POISEUILLE FLOW; TRANSITION; STABILITY; TURBULENCE AB A channel with rectangular cross section, 40:1 aspect ratio (height is 0.0127 m), and 4.27 m test section length (336 channel heights) was used to study the effects of imposed pulsations on laminar, transitional, and turbulent flow phenomena. Periodic velocity variations are produced in the test section by using a single rotating vane located in the flow downstream of the test section. Details of the imposed pulsation and phase-averaging techniques are given, along with data that show how the pulsating velocity varies in the test section, including changes to the shapes, amplitudes, and phase shifts of velocity waveforms at different channel locations. Flows with Reynolds numbers (Re) ranging from 1100 to 3700 are studied at Stokes numbers (St) of 4.08 and 5.79 and Strouhal numbers of 0.033 to 0.121 by imposing pulsations at 1 Hz and at 2 Hz. Pulsations at St = 4.08 have peak-to-peak amplitudes 1.4- 16% of the local mean velocity, and at 5.79, peak-to-peak amplitudes are 4.5-25% of the local mean velocity. With these amplitudes and frequencies of imposed pulsation, time-averaged velocity profiles both within and outside of the Stokes layer are unaffected by the imposed pulsations for the entire range of Reynolds numbers studied. Phase-averaged traces show sinusoidal behavior across the channel height at Stokes numbers of 4.08 and 5.79 when flow is laminar (Re = 1100), transitional (Re = 1580), and turbulent (Re = 2550 and 3660). The sinusoidal nature of the waveforms is evident from spectra of voltage fluctuations from hot-wire sensors, which show principal pulsation amplitudes that are from one to three orders of magnitude greater than the amplitudes of harmonic peaks. Phase-averaged velocities are significantly nonsinusoidal at higher transitional Reynolds numbers near 2010, particularly for St = 4.08. These deviations coincide with significant changes in the amplitudes and phase lags of phase-averaged velocities compared to results at other Reynolds numbers where measurements were obtained. RP LIGRANI, PM (reprint author), USN,POSTGRAD SCH,DEPT MECH ENGN,MONTEREY,CA 93943, USA. OI Subramanian, Chelakara S./0000-0003-4149-2972 NR 30 TC 7 Z9 7 U1 0 U2 0 PU ELSEVIER SCIENCE INC PI NEW YORK PA 655 AVENUE OF THE AMERICAS, NEW YORK, NY 10010 SN 0894-1777 J9 EXP THERM FLUID SCI JI Exp. Therm. Fluid Sci. PD MAR PY 1992 VL 5 IS 2 BP 145 EP 161 DI 10.1016/0894-1777(92)90001-L PG 17 WC Thermodynamics; Engineering, Mechanical; Physics, Fluids & Plasmas SC Thermodynamics; Engineering; Physics GA HK052 UT WOS:A1992HK05200001 ER PT J AU GUARDA, S AF GUARDA, S TI 'SCHACH VON WUTHENOW', A PASSION PLAY IN THE STYLE OF FONTANE SO GERMANIC REVIEW LA German DT Article RP GUARDA, S (reprint author), USN ACAD,ANNAPOLIS,MD 21402, USA. NR 28 TC 2 Z9 2 U1 0 U2 0 PU HELDREF PUBLICATIONS PI WASHINGTON PA 1319 EIGHTEENTH ST NW, WASHINGTON, DC 20036-1802 SN 0016-8890 J9 GER REV JI Ger. Rev. PD SPR PY 1992 VL 67 IS 2 BP 59 EP 68 PG 10 WC Literature, German, Dutch, Scandinavian SC Literature GA JE227 UT WOS:A1992JE22700002 ER PT J AU CREPEAU, PJ AF CREPEAU, PJ TI UNCODED AND CODED PERFORMANCE OF MFSK AND DPSK IN NAKAGAMI FADING CHANNELS SO IEEE TRANSACTIONS ON COMMUNICATIONS LA English DT Article AB There are many communication systems employing noncoherent MFSK or DPSK that are required to operate in channels with a fairly wide range of fading and scintillation conditions. To model these disturbances there are available two generalizations of the Rayleigh fading channel: the Rician channel and the Nakagami-m channel. Thus far, the majority of analytical studies have utilized the Rician channel in preference to the Nakagami-m channel, and surprisingly, some basic results for the Nakagami channel have been overlooked. In this paper, we present uncoded and coded performance results for noncoherent MFSK and DPSK in a slow nonselective Nakagami-m fading channel. We give simple expressions for the asymptotic slopes of probability of bit error for large signal-to-noise ratio, and show that the effective order of diversity compared to an uncoded Rayleigh channel is the product of two parameters, one for the channel and one for the code. Finally, we present a comparison of the uncoded Nakagami-m results to those of the Rician channel in order to show performance differences between these two generalized fading channel models. C1 GEORGE WASHINGTON UNIV,ELECT ENGN,WASHINGTON,DC 20052. RP CREPEAU, PJ (reprint author), USN,RES LAB,DIV INFORMAT TECHNOL,WASHINGTON,DC 20375, USA. NR 27 TC 45 Z9 45 U1 0 U2 2 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0090-6778 J9 IEEE T COMMUN JI IEEE Trans. Commun. PD MAR PY 1992 VL 40 IS 3 BP 487 EP 493 DI 10.1109/26.135718 PG 7 WC Engineering, Electrical & Electronic; Telecommunications SC Engineering; Telecommunications GA HR454 UT WOS:A1992HR45400008 ER PT J AU KIMES, DS HARRISON, PR HARRISON, PA AF KIMES, DS HARRISON, PR HARRISON, PA TI LEARNING CLASS DESCRIPTIONS FROM A DATA-BASE OF SPECTRAL REFLECTANCE WITH MULTIPLE VIEW ANGLES SO IEEE TRANSACTIONS ON GEOSCIENCE AND REMOTE SENSING LA English DT Article ID DIRECTIONAL REFLECTANCE; VEGETATION CANOPIES; FACTOR DISTRIBUTIONS AB A program was developed to learn class descriptions from positive and negative training examples of spectral, directional reflectance data taken from natural surfaces such as bare soil, natural vegetation, or agricultural vegetation. The learning program combined a form of learning referred to as learning by example with the generate and test paradigm to provide a robust learning environment that could handle error prone data. The learning program was tested by having it learn class descriptions of various categories of percent ground cover and plant height. These class descriptions were then used to classify an array of targets. The class descriptions in this program were comprised of a series of different relationships between combinations of directional view angles, e.g., (30 50), (45 60), (10 180), etc. where the values in parentheses are the zenith and relative azimuth view angles for a particular view. The program found the sequence of relationships that contained the most important information that distinguished the classes. The concept being learned was a sequence of relationships that optimized the discrimination of a class. A relationship or "instance," as defined in this paper, can be any user-defined directional spectral relationship. In this paper the possible relationships (instances) included in a class description were greater than relationships in terms of reflectance between all possible combinations of two view angles (e.g., greater than (60 180), (40 0)), first maximum, second maximum, first minimum, and second minimum relationships for each possible view angle (e.g., first-max (15 135)). In theory, the user could define any class they wish. This could include a broad category such as soil or vegetation. It could also include more specific classes such as corn, soybeans, or wheat. It might also include subclasses based on discrete breakdowns of continuous parameters. For example, ground cover could be divided into the categories; sparse (0-30% ground cover), intermediate (30-60% ground cover), and dense (60-100% ground cover). Structurally related classes such as homogeneous and nonhomogeneous vegetation canopies might also be used. Other class concepts might include things such as species, biomass, leaf area index, physical location, vegetation structure, or portion green leaf material or solar zenith angle. The learning program used Artificial Intelligence techniques that automate a very tedious process that would traditionally require an expert to iterate the process for every combination of solar zenith angle, class, and sensor system used. C1 USN ACAD,ANNAPOLIS,MD 21402. JJM SYST INC,ANNAPOLIS,MD 21401. RP KIMES, DS (reprint author), NASA,GODDARD SPACE FLIGHT CTR,EARTH RESOURCES BRANCH,GREENBELT,MD 20771, USA. NR 21 TC 4 Z9 4 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 0196-2892 J9 IEEE T GEOSCI REMOTE JI IEEE Trans. Geosci. Remote Sensing PD MAR PY 1992 VL 30 IS 2 BP 315 EP 325 DI 10.1109/36.134081 PG 11 WC Geochemistry & Geophysics; Engineering, Electrical & Electronic; Remote Sensing; Imaging Science & Photographic Technology SC Geochemistry & Geophysics; Engineering; Remote Sensing; Imaging Science & Photographic Technology GA HP272 UT WOS:A1992HP27200012 ER PT J AU HAYS, RT AF HAYS, RT TI SYSTEMS CONCEPTS FOR TRAINING SYSTEMS-DEVELOPMENT SO IEEE TRANSACTIONS ON SYSTEMS MAN AND CYBERNETICS LA English DT Article ID SIMULATOR AB Training system development is often fragmented and less than optimally successful because many individuals who influence training development lack a true "systems" perspective. This paper reviews literature showing the effects of fragmented training development, and presents systems theory and training systems concepts and definitions. It also provides a discussion of system-oriented research issues in the areas of: training needs and goals analysis; training device design and use; and training system evaluation. A systems perspective will facilitate communication between the diverse individuals engaged in training system development, as well as other individuals that influence the development and implementation of training systems. It will help sensitize them to the needs and goals of the various groups that interact with their own needs, goals, and decisions. RP HAYS, RT (reprint author), USN,CTR TRAINING SYST,DIV HUMAN FACTORS,TRAINING APPLICAT BRANCH,12350 RES PKWY,ORLANDO,FL 32826, USA. NR 81 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 0018-9472 J9 IEEE T SYST MAN CYB JI IEEE Trans. Syst. Man Cybern. PD MAR-APR PY 1992 VL 22 IS 2 BP 258 EP 266 DI 10.1109/21.148428 PG 9 WC Computer Science, Cybernetics; Engineering, Electrical & Electronic SC Computer Science; Engineering GA JF034 UT WOS:A1992JF03400004 ER PT J AU FELDMANN, M JUNE, CH MCMICHAEL, A MAINI, R SIMPSON, E WOODY, JN AF FELDMANN, M JUNE, CH MCMICHAEL, A MAINI, R SIMPSON, E WOODY, JN TI T-CELL-TARGETED IMMUNOTHERAPY SO IMMUNOLOGY TODAY LA English DT Editorial Material AB The pace of T-cell research is matched only by the speed with which fundamental advances are being developed as new therapies. This report from a recent meeting* updates developments in a number of immunointervention strategies. C1 USN,MED RES INST,BETHESDA,MD 20889. JOHN RADCLIFF HOSP,INST MOLEC MED,OXFORD OX3 9DE,ENGLAND. KENNEDY INST,LONDON W6 7DW,ENGLAND. CLIN RES CTR,TRANSPLANTAT BIOL SECT,HARROW HA1 3UJ,MIDDX,ENGLAND. CENTOCOR INC,MALVERN,PA 19355. RP FELDMANN, M (reprint author), CHARING CROSS SUNLEY MED RES CTR,LURGAN AVE,LONDON W6 8LW,ENGLAND. NR 0 TC 15 Z9 15 U1 0 U2 1 PU ELSEVIER SCI LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, OXON, ENGLAND OX5 1GB SN 0167-5699 J9 IMMUNOL TODAY JI Immunol. Today PD MAR PY 1992 VL 13 IS 3 BP 84 EP 85 DI 10.1016/0167-5699(92)90146-X PG 2 WC Immunology SC Immunology GA HH079 UT WOS:A1992HH07900002 PM 1622543 ER PT J AU Kottemann, JE Dolk, DR AF Kottemann, Jeffrey E. Dolk, Daniel R. TI Model Integration and Modeling Languages: A Process Perspective SO INFORMATION SYSTEMS RESEARCH LA English DT Article DE Model management; Model integration; Modeling systemc; Modeling languages AB Development of large-scale models often involves or, certainly could benefit from linking existing models. This process is termed model integration and involves two related aspects: (1) the coupling of model representations, and (2) the coupling of the processes for evaluating, or executing, instances of these representations. Given this distinction, we overview model integration capabilities in existing executable modeling languages, discuss current theoretical approaches to model integration, and identify the limiting assumptions implicitly made in both cases. In particular. current approaches assume away issues of dynamic variable correspondence and synchronization in composite model execution. We then propose a process-oriented conceptualization and associated constructs that overcome these limiting assumptions. The constructs allow model components to be used as building blocks for more elaborate composite models in ways unforeseen when the components were originally developed. While we do not prove the sufficiency of the constructs over the set of all model types and integration configurations, we present several examples of model integration from various domains to demonstrate the utility of the approach. C1 [Kottemann, Jeffrey E.] Univ Michigan, Sch Business Adm, Ann Arbor, MI 48109 USA. [Dolk, Daniel R.] Naval Postgrad Sch, Dept Adm Sci, Monterey, CA 93943 USA. RP Kottemann, JE (reprint author), Univ Michigan, Sch Business Adm, Ann Arbor, MI 48109 USA. FU U.S. Department of the Army [N62271-86-M-0209]; Division of Research, School of Business, University of Michigan FX We wish to thank the Associate Editor and the three reviewers for their helpful comments. Research funding from the U.S. Department of the Army (Grant N62271-86-M-0209) and the Division of Research, School of Business, University of Michigan are gratefully acknowledged. NR 25 TC 29 Z9 29 U1 0 U2 0 PU INFORMS PI CATONSVILLE PA 5521 RESEARCH PARK DR, SUITE 200, CATONSVILLE, MD 21228 USA SN 1047-7047 EI 1526-5536 J9 INFORM SYST RES JI Inf. Syst. Res. PD MAR PY 1992 VL 3 IS 1 BP 1 EP 16 DI 10.1287/isre.3.1.1 PG 16 WC Information Science & Library Science; Management SC Information Science & Library Science; Business & Economics GA V45SX UT WOS:000209837400001 ER PT J AU THEISE, ES AF THEISE, ES TI THE MATRIX - COMPUTER-NETWORKS AND CONFERENCING SYSTEMS WORLDWIDE - QUARTERMAN,JS SO INTERFACES LA English DT Book Review RP THEISE, ES (reprint author), USN,POSTGRAD SCH,DEPT OPERAT RES,MONTEREY,CA, USA. NR 3 TC 0 Z9 0 U1 0 U2 0 PU INST OPERATIONS RESEARCH MANAGEMENT SCIENCES PI LINTHICUM HTS PA 901 ELKRIDGE LANDING RD, STE 400, LINTHICUM HTS, MD 21090-2909 SN 0092-2102 J9 INTERFACES JI Interfaces PD MAR-APR PY 1992 VL 22 IS 2 BP 116 EP 119 PG 4 WC Management; Operations Research & Management Science SC Business & Economics; Operations Research & Management Science GA HP428 UT WOS:A1992HP42800019 ER PT J AU Schwartz, IB Tsang, KY AF Schwartz, Ira B. Tsang, Kwok Yeung TI PREDICTING ATTRACTING OUT-OF-PHASE STATES IN COUPLED JOSEPHSON JUNCTIONS SO INTERNATIONAL JOURNAL OF BIFURCATION AND CHAOS LA English DT Article AB Recent progress in understanding the dynamics and bifurcation of two coupled Josephson Junctions is numerically presented. The dependencies of the in-phase (IP) states and the anti-phase (AP) states on the parameters are shown when the coupling is symmetric. The connecting branches between the IP and AP are computed, and are found to be saddles which form the basin boundaries between the IP and AP states. A framework is presented based on a two oscillator model with asymmetric coupling which can predict the dynamics of higher dimensional systems. The behavior of out-of-phase (OP) states of n-junctions is examined using this asymmetric model when the oscillators are organized into two distinct groups. C1 [Schwartz, Ira B.; Tsang, Kwok Yeung] USN, Res Lab, Div Plasma Phys, Special Project Nonlinear Sci, Washington, DC 20375 USA. RP Schwartz, IB (reprint author), USN, Res Lab, Div Plasma Phys, Special Project Nonlinear Sci, Code 4700-3, Washington, DC 20375 USA. FU Office of Naval Research; Office of Naval Technology; American Society of Engineering Education FX We thank Shou-Li Peng and Kurt Wiesenfeld for stimulating discussions. This work was supported by the Office of Naval Research, the Office of Naval Technology, and the American Society of Engineering Education. NR 16 TC 3 Z9 3 U1 0 U2 0 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 MAR PY 1992 VL 2 IS 1 BP 177 EP 181 DI 10.1142/S0218127492000161 PG 5 WC Mathematics, Interdisciplinary Applications; Multidisciplinary Sciences SC Mathematics; Science & Technology - Other Topics GA V28EO UT WOS:000208664300015 ER PT J AU Brown, R Chua, L Popp, B AF Brown, Ray Chua, Leon Popp, Becky TI IS SENSITIVE DEPENDENCE ON INITIAL CONDITIONS NATURE'S SENSORY DEVICE? SO INTERNATIONAL JOURNAL OF BIFURCATION AND CHAOS LA English DT Article AB In this letter we illustrate three methods of using nonlinear devices as sensors. We show that the sensory features of these devices is a result of sensitive dependence on parameters which we show is equivalent to sensitive dependence on initial conditions. As a result, we conjecture that sensitive dependence on initial conditions is nature's sensory device in cases where remarkable feats of sensory perception are seen. C1 [Brown, Ray; Chua, Leon] Univ Calif Berkeley, Dept Elect Engn & Comp Sci, Berkeley, CA 94720 USA. [Popp, Becky] USN, Res Lab, Washington, DC 20375 USA. RP Brown, R (reprint author), Univ Calif Berkeley, Dept Elect Engn & Comp Sci, Berkeley, CA 94720 USA. NR 6 TC 16 Z9 30 U1 0 U2 8 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 MAR PY 1992 VL 2 IS 1 BP 193 EP 199 DI 10.1142/S0218127492000185 PG 7 WC Mathematics, Interdisciplinary Applications; Multidisciplinary Sciences SC Mathematics; Science & Technology - Other Topics GA V28EO UT WOS:000208664300017 ER PT J AU MONROY, RL DAVIS, TA NIELSEN, TB STATON, AJ AF MONROY, RL DAVIS, TA NIELSEN, TB STATON, AJ TI PERIPHERAL-BLOOD HEMATOPOIETIC PROGENITOR STEM-CELLS PROLIFERATE TO FORM COLONIES IN LIQUID CULTURE BUT REQUIRE CONTACT WITH VASCULAR ENDOTHELIAL-CELLS AND GM-CSF SO INTERNATIONAL JOURNAL OF CELL CLONING LA English DT Article DE ENDOTHELIAL CELLS; GM-CSF; IL-1; IL-3; PRIMATE; PERIPHERAL BLOOD STEM CELLS ID STIMULATING FACTOR; GROWTH-FACTOR; BONE-MARROW; INTERLEUKIN-1; EXPANDS AB To test the hypothesis whether peripheral blood hematopoietic progenitor/stem cells (PBSCs) interact with vascular endothelial cells during events leading to extramedullary hematopoiesis, we cocultured T-cell depleted, peripheral blood mononuclear cells obtained from cytokine treated primates in liquid culture containing a monolayer of porcine aortic endothelial cells (PAECs) for 7 days. Recombinant human granulocyte-macrophage colony-stimulating factor (GM-CSF) added to cocultures of PBSC-PAEC stimulated colony formation, while only a few clusters were observed in cultures without GM-CSF. In contrast, colony formation was not stimulated when either interleukin 1 (IL-1) or IL-3 were added to the cultures. Colony and cluster formation in response to GM-CSF was dose dependent; 20 +/- 5 colonies/5,000 cells were formed at 3 U/ml, and optimal colony formation of 42 +/- 11/5,000 cells occurred at 100 U/ml. Colonies formed in the presence of GM-CSF were large, and most contained > 200 cells. Morphological and phenotypical characterization of cells from isolated colonies suggested that the majority of cells were predominantly immature myeloid elements. However, there was also a low but consistent frequency of megakaryocytic lineage cells. Thus, PBSCs interact with non-bone marrow- derived vascular endothelial cells and proliferate, but only in the presence of GM-CSF, suggesting that PBSC interaction with vascular endothelial cells in vivo could lead to extramedullary hematopoiesis. C1 USN,MED RES INST,WOUND REPAIR ENHANCEMENT,BETHESDA,MD 20814. RP MONROY, RL (reprint author), USN,MED RES INST,IMMUNE CELL BIOL PROGRAM,BETHESDA,MD 20889, USA. NR 37 TC 7 Z9 7 U1 0 U2 1 PU ALPHAMED PRESS PI DAYTON PA 4100 S KETTERING BLVD, DAYTON, OH 45439-2092 SN 0737-1454 J9 INT J CELL CLONING PD MAR PY 1992 VL 10 IS 2 BP 105 EP 115 PG 11 WC Biotechnology & Applied Microbiology SC Biotechnology & Applied Microbiology GA HJ631 UT WOS:A1992HJ63100007 PM 1545150 ER PT J AU GATES, WR TERASAWA, KL AF GATES, WR TERASAWA, KL TI COMMITMENT, THREAT PERCEPTIONS, AND EXPENDITURES IN A DEFENSE ALLIANCE SO INTERNATIONAL STUDIES QUARTERLY LA English DT Article ID COLLECTIVE GOODS; INTERNATIONAL COOPERATION; PRIVATE PROVISION; NATO AB The economic theory of alliances is based on public goods theory. This theory has been modified to include defense resources with mixed public/private benefits. This paper develops a defense alliance model that distinguishes public from private benefits based on the degree to which defense resources are committed to the alliance. Resources fully committed to the alliance (e.g., U.S. troops stationed abroad) provide public benefits. Partially committed resources (e.g., U.S.-based NATO reinforcements) provide mixed public/private benefits. Finally, resources committed to uses outside the alliance (e.g., internal security and unrelated international interests) provide mostly private benefits. Threat perceptions are also used in explaining alliance defense expenditures. This model provides plausible explanations for recent defense expenditure trends. lt also suggests important policy implications. In particular, free riding is an inherent characteristic of defense alliances and aggregate defense expenditure data cannot measure the distribution of the defense burden. RP GATES, WR (reprint author), USN,POSTGRAD SCH,MONTEREY,CA 93943, USA. NR 40 TC 13 Z9 13 U1 0 U2 4 PU BLACKWELL PUBLISHERS PI CAMBRIDGE PA 350 MAIN STREET, STE 6, CAMBRIDGE, MA 02148-5023 SN 0020-8833 J9 INT STUD QUART JI Int. Stud. Q. PD MAR PY 1992 VL 36 IS 1 BP 101 EP 118 DI 10.2307/2600918 PG 18 WC International Relations; Political Science SC International Relations; Government & Law GA JN374 UT WOS:A1992JN37400005 ER PT J AU VANKEUREN, DK AF VANKEUREN, DK TI CURATORS AND CULTURE - THE MUSEUM MOVEMENT IN AMERICA, 1740-1870 - OROSZ,JJ SO ISIS LA English DT Book Review RP VANKEUREN, DK (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 1 TC 0 Z9 0 U1 0 U2 0 PU UNIV CHICAGO PRESS PI CHICAGO PA 5720 S WOODLAWN AVE, CHICAGO, IL 60637 SN 0021-1753 J9 ISIS JI Isis PD MAR PY 1992 VL 83 IS 1 BP 142 EP 143 DI 10.1086/356064 PG 2 WC History & Philosophy Of Science SC History & Philosophy of Science GA HL978 UT WOS:A1992HL97800047 ER PT J AU GREER, WR MOSES, OD AF GREER, WR MOSES, OD TI EXTENDING TECHNOLOGY - THE ESTIMATION AND CONTROL OF COSTS SO JOURNAL OF ACCOUNTING AND PUBLIC POLICY LA English DT Note ID ADVANCE; STATE; ART AB When firms undertake new development projects designed to extend technology, there is considerable uncertainty as to the amount of cost that will eventually be incurred. This study examines product technology as a driver of product development and production costs. Our study tests hypotheses concerning the relationships between extensions in technology and costs, and provides insights into estimating and controlling costs. Our study relies on techniques available for measuring the state-of-the-art of technology and for quantifying the incremental progress represented by a particular project. First, relationships among technology measures, development time, and development cost are formulated and tested. Next, variance measures related to development cost are developed. Finally, associations between technological complexity, development cost, and production cost are examined. The viability of this approach for cost prediction is demonstrated by using technological and cost data from 18 satellite programs. C1 NAVAL POST GRAD SCH,DEPT ADM SCI,MONTEREY,CA 93943. NR 24 TC 2 Z9 2 U1 0 U2 2 PU ELSEVIER SCIENCE INC PI NEW YORK PA 655 AVENUE OF THE AMERICAS, NEW YORK, NY 10010 SN 0278-4254 J9 J ACCOUNT PUBLIC POL JI J. Account. Public Policy PD SPR PY 1992 VL 11 IS 1 BP 43 EP 66 DI 10.1016/0278-4254(92)90014-O PG 24 WC Business, Finance; Public Administration SC Business & Economics; Public Administration GA HW143 UT WOS:A1992HW14300002 ER PT J AU CENKO, A CLESSAS, G PHILLIPS, K AF CENKO, A CLESSAS, G PHILLIPS, K TI GROUND-TESTING TECHNIQUES FOR TETHERED SYSTEMS SO JOURNAL OF AIRCRAFT LA English DT Article AB On November 21 and 22, 1988 TDU-34 tow target tests were conducted at the David Taylor Research Center. The purposes of these tests were to determine the launch characteristics of the TDU-34A/A tow target, which had hit the A-6 aircraft during its initial launch. Additional test objectives were the validation of the Tow Target Trajectory Program and an investigation of the ability of the Influence Function Method to predict tow target trajectories. RP CENKO, A (reprint author), USN,CTR AIR DEV,WARMINSTER,PA 18974, USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER INST AERONAUT ASTRONAUT PI RESTON PA 1801 ALEXANDER BELL DRIVE, STE 500, RESTON, VA 22091 SN 0021-8669 J9 J AIRCRAFT JI J. Aircr. PD MAR-APR PY 1992 VL 29 IS 2 BP 250 EP 254 DI 10.2514/3.46152 PG 5 WC Engineering, Aerospace SC Engineering GA HM898 UT WOS:A1992HM89800013 ER PT J AU CONE, EJ DICKERSON, S PAUL, BD MITCHELL, JM AF CONE, EJ DICKERSON, S PAUL, BD MITCHELL, JM TI FORENSIC DRUG-TESTING FOR OPIATES .4. ANALYTICAL SENSITIVITY, SPECIFICITY, AND ACCURACY OF COMMERCIAL URINE OPIATE IMMUNOASSAYS SO JOURNAL OF ANALYTICAL TOXICOLOGY LA English DT Article ID GAS-CHROMATOGRAPHY; ABUSE C1 USN,DRUG SCREENING LAB,NAVA AIR STN,NORFOLK,VA 23511. USN,DRUG SCREENING LAB,NAVAL AIR STN,JACKSONVILLE,FL 32212. RP CONE, EJ (reprint author), NIDA,ADDICT RES CTR,POB 5180,BALTIMORE,MD 21224, USA. NR 9 TC 33 Z9 34 U1 0 U2 5 PU PRESTON PUBLICATIONS INC PI NILES PA 7800 MERRIMAC AVE PO BOX 48312, NILES, IL 60648 SN 0146-4760 J9 J ANAL TOXICOL JI J. Anal. Toxicol. PD MAR-APR PY 1992 VL 16 IS 2 BP 72 EP 78 PG 7 WC Chemistry, Analytical; Toxicology SC Chemistry; Toxicology GA HK153 UT WOS:A1992HK15300002 PM 1501467 ER PT J AU KARES, RJ GEARY, JL GROSSMANN, JM AF KARES, RJ GEARY, JL GROSSMANN, JM TI A NEW THEORY OF THE PLASMA-FILLED DIODE SO JOURNAL OF APPLIED PHYSICS LA English DT Article AB The behavior of a planar plasma-filled diode (PFD) is examined in the limit in which the mass of the plasma ions is allowed to approach infinity. In this limit the plasma ions are immobilized and act as a fixed, spatially uniform background of positive charge. Using a one-dimensional, electrostatic particle-in-cell simulation of a PFD coupled to an external LC circuit, it is shown that the PFD still has a low-voltage conduction phase followed by a high-voltage opening phase in this limiting case. An analytic theory is developed that describes the operation of the diode in the immobile ion case, and this theory is shown to be in good agreement with the simulation results. A simple expression is also derived that gives an upper bound on the current that may be conducted before opening as a function of the density of immobile ions. Finally, it is shown that essentially the same process that determines the behavior of the PFD in the immobile ion limit also controls the operation of the PFD in the case where the ions have finite mass and are free to move under the influence of the diode electric fields. C1 BERKELEY RES ASSOCIATES INC,SPRINGFIELD,VA 22150. USN,RES LAB,WASHINGTON,DC 20375. RP KARES, RJ (reprint author), BERKELEY RES ASSOCIATES INC,POB 241,BERKELEY,CA 94701, USA. NR 8 TC 9 Z9 9 U1 0 U2 0 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0021-8979 J9 J APPL PHYS JI J. Appl. Phys. PD MAR 1 PY 1992 VL 71 IS 5 BP 2168 EP 2180 DI 10.1063/1.351113 PG 13 WC Physics, Applied SC Physics GA HF690 UT WOS:A1992HF69000014 ER PT J AU CAMPBELL, ML WAITE, BA AF CAMPBELL, ML WAITE, BA TI STANDARD STATES FOR WATER EQUILIBRIUM SO JOURNAL OF CHEMICAL EDUCATION LA English DT Letter RP CAMPBELL, ML (reprint author), USN ACAD,ANNAPOLIS,MD 21402, USA. 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 0021-9584 J9 J CHEM EDUC JI J. Chem. Educ. PD MAR PY 1992 VL 69 IS 3 BP 256 EP 256 PG 1 WC Chemistry, Multidisciplinary; Education, Scientific Disciplines SC Chemistry; Education & Educational Research GA HK823 UT WOS:A1992HK82300035 ER PT J AU DEVRIES, JW AF DEVRIES, JW TI FIELD-MEASUREMENTS OF THE EROSION OF COHESIVE SEDIMENTS SO JOURNAL OF COASTAL RESEARCH LA English DT Article DE COHESIVE SEDIMENTS; EROSION; CRITICAL SHEAR STRESS; MARE ISLAND STRAIT; FIELD MEASUREMENT AB Predictive modeling of estuarial fine sediment transport requires a description of the erosional properties of cohesive sediment beds. Available descriptions are commonly based upon flume experiments run on uniform beds. Field data pertaining to the erosion process are rather scarce. A field experiment was undertaken at Mare Island Strait near Vallejo, California, to address the issue of surface erosion of a cohesive sediment bed. Suspended sediment concentration and water velocity data were collected in the bottom boundary layer of this muddy estuary. As a result, the critical shear stress of erosion initiation was found to be 1.44 dynes/cm2 and the erosion rate coefficient was found to be 6.25 x 10(-4) mg/cm2-sec. These values compare favorably with results obtained in recent flume experiments. RP DEVRIES, JW (reprint author), USN,CIVIL ENGN LAB,PORT HUENEME,CA 93043, USA. NR 0 TC 7 Z9 7 U1 0 U2 1 PU COASTAL EDUCATION & RESEARCH FOUNDATION PI LAWRENCE PA 810 EAST 10TH STREET, LAWRENCE, KS 66044 SN 0749-0208 J9 J COASTAL RES JI J. Coast. Res. PD SPR PY 1992 VL 8 IS 2 BP 312 EP 318 PG 7 WC Environmental Sciences; Geography, Physical; Geosciences, Multidisciplinary SC Environmental Sciences & Ecology; Physical Geography; Geology GA KX286 UT WOS:A1992KX28600006 ER PT J AU CHANG, LW AF CHANG, LW TI DYNAMICS AND CONTROL OF VERTICAL-PLANE MOTION FOR AN ELECTROHYDRAULICALLY ACTUATED SINGLE-FLEXIBLE-LINK ARM SO JOURNAL OF DYNAMIC SYSTEMS MEASUREMENT AND CONTROL-TRANSACTIONS OF THE ASME LA English DT Article AB A research tool was developed for the dynamics and control of a single-flexible-link arm based on the Equivalent Rigid Link System (ERLS) dynamic model and the inverse dynamics of the arm and the actuator. The arm moved in a vertical plane and was actuated by an electrohydraulic motor. The required torque was computed based on the inverse dynamics of the ERLS model. The driving current was then predicted by the inverse actuator dynamics. This paper also presents a 16-bit microcomputer-based low-cost implementation of a nonlinear motion tracking control. The dynamic behavior of the control system was studied through the computer simulation and the experiment. Furthermore, the superiority of the flexible-body control was also proved through the comparison to the rigid-body control. RP CHANG, LW (reprint author), USN,POSTGRAD SCH,DEPT MECH ENGN,MONTEREY,CA 93943, USA. NR 16 TC 5 Z9 6 U1 0 U2 0 PU ASME-AMER SOC MECHANICAL ENG PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 SN 0022-0434 J9 J DYN SYST-T ASME JI J. Dyn. Syst. Meas. Control-Trans. ASME PD MAR PY 1992 VL 114 IS 1 BP 89 EP 95 DI 10.1115/1.2896511 PG 7 WC Automation & Control Systems; Instruments & Instrumentation SC Automation & Control Systems; Instruments & Instrumentation GA HP704 UT WOS:A1992HP70400011 ER PT J AU DOSS, ED ROY, GD AF DOSS, ED ROY, GD TI FLOW DEVELOPMENT AND ANALYSIS OF MHD GENERATORS AND SEAWATER THRUSTERS SO JOURNAL OF FLUIDS ENGINEERING-TRANSACTIONS OF THE ASME LA English DT Article ID 3-DIMENSIONAL FLOW AB The flow characteristics inside magnetohydrodynamic (MHD) plasma generators and seawater thrusters are analyzed and are compared using a three-dimensional computer model that solves the governing partial differential equations for fluid flow and electrical fields. Calculations have been performed for a Faraday plasma generator and for a continuous electrode seawater thruster. The results of the calculations show that the effects caused by the interaction of the MHD forces with the fluid flow are strongly manifested in the case of the MHD generator as compared to the flow development in the MHD thruster. The existence of velocity overshoots over the sidewalls confirm previously published results for MHD generators with strong MHD interaction. For MHD thrusters, the velocity profile is found to be slightly flatter over the sidewall as compared to that over the electrode wall. As a result, distinct enhancement of the skin friction exists over the sidewalls of MHD generators in comparison to that of MHD thrusters. Plots of velocity profiles and skin friction distributions are presented to illustrate and compare the flow development in MHD generators and thrusters. C1 OFF NAVAL RES,ARLINGTON,VA 22217. RP DOSS, ED (reprint author), ARGONNE NATL LAB,ARGONNE,IL 60439, USA. NR 14 TC 2 Z9 2 U1 0 U2 2 PU ASME-AMER SOC MECHANICAL ENG PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 SN 0098-2202 J9 J FLUID ENG-T ASME JI J. Fluids Eng.-Trans. ASME PD MAR PY 1992 VL 114 IS 1 BP 68 EP 72 DI 10.1115/1.2910002 PG 5 WC Engineering, Mechanical SC Engineering GA HP713 UT WOS:A1992HP71300011 ER PT J AU BAKER, CJ AF BAKER, CJ TI THE OSCILLATION OF HORSESHOE VORTEX SYSTEMS - CLOSURE SO JOURNAL OF FLUIDS ENGINEERING-TRANSACTIONS OF THE ASME LA English DT Discussion RP BAKER, CJ (reprint author), USN,CTR UNDERSEA WARFAE,CODE 804,NEWPORT,RI 02841, USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU ASME-AMER SOC MECHANICAL ENG PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 SN 0098-2202 J9 J FLUID ENG-T ASME JI J. Fluids Eng.-Trans. ASME PD MAR PY 1992 VL 114 IS 1 BP 134 EP 134 DI 10.1115/1.2909991 PG 1 WC Engineering, Mechanical SC Engineering GA HP713 UT WOS:A1992HP71300023 ER PT J AU JORGENSEN, PET PRICE, GL AF JORGENSEN, PET PRICE, GL TI INDEX THEORY AND 2ND QUANTIZATION OF BOUNDARY-VALUE-PROBLEMS SO JOURNAL OF FUNCTIONAL ANALYSIS LA English DT Article ID QUASI-FREE DERIVATIONS; STAR-ENDOMORPHISMS; CONTINUOUS ANALOGS; CAR ALGEBRA; FOCK SPACE; SEMIGROUPS; REPRESENTATIONS; ISOMETRIES; EXTENSIONS; B(H) C1 USN ACAD,ANNAPOLIS,MD 21402. RP JORGENSEN, PET (reprint author), UNIV IOWA,IOWA CITY,IA 52242, USA. NR 38 TC 12 Z9 12 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 0022-1236 J9 J FUNCT ANAL JI J. Funct. Anal. PD MAR PY 1992 VL 104 IS 2 BP 243 EP 290 DI 10.1016/0022-1236(92)90001-Y PG 48 WC Mathematics SC Mathematics GA HL281 UT WOS:A1992HL28100001 ER PT J AU WILLMAN, WW AF WILLMAN, WW TI PROBING BEHAVIOR IN CERTAIN OPTIMAL PERTURBATION CONTROL LAWS SO JOURNAL OF GUIDANCE CONTROL AND DYNAMICS LA English DT Note RP WILLMAN, WW (reprint author), USN,CTR WEAP,RES DEPT,CHINA LAKE,CA 93555, USA. NR 6 TC 0 Z9 0 U1 0 U2 0 PU AMER INST AERONAUT ASTRONAUT PI RESTON PA 1801 ALEXANDER BELL DRIVE, STE 500, RESTON, VA 22091 SN 0731-5090 J9 J GUID CONTROL DYNAM JI J. Guid. Control Dyn. PD MAR-APR PY 1992 VL 15 IS 2 BP 525 EP 527 DI 10.2514/3.20867 PG 3 WC Engineering, Aerospace; Instruments & Instrumentation SC Engineering; Instruments & Instrumentation GA HK051 UT WOS:A1992HK05100032 ER PT J AU PETRUCCELLI, BP MURPHY, GS SANCHEZ, JL WALZ, S DEFRAITES, R GELNETT, J HABERBERGER, RL ECHEVERRIA, P TAYLOR, DN AF PETRUCCELLI, BP MURPHY, GS SANCHEZ, JL WALZ, S DEFRAITES, R GELNETT, J HABERBERGER, RL ECHEVERRIA, P TAYLOR, DN TI TREATMENT OF TRAVELERS DIARRHEA WITH CIPROFLOXACIN AND LOPERAMIDE SO JOURNAL OF INFECTIOUS DISEASES LA English DT Note ID CAMPYLOBACTER-JEJUNI AB To determine the efficacy of loperamide given with long- and short-course quinolone therapy for treating traveler's diarrhea, 142 US military personnel were randomized to receive a single 750-mg dose of ciprofloxacin with placebo, 750 mg of ciprofloxacin with loperamide, or a 3-day course of 500 mg of ciprofloxacin twice daily with loperamide. Culture of pretreatment stool specimens revealed campylobacters (41%), salmonellae (18%), enterotoxigenic Escherichia coli (ETEC, 6%), and shigellae (4%). Of the participants, 87% completely recovered within 72 h of entry. Total duration of illness did not differ significantly among the three treatment groups, but patients in the 3-day ciprofloxacin plus loperamide group reported a lower cumulative number of liquid bowel movements at 48 and 72 h after enrollment compared with patients in the single-dose ciprofloxacin plus placebo group (1.8 vs. 3.6, P = .01; 2.0 vs. 3.9, P = .01). While not delivering a remarkable therapeutic advantage, loperamide appears to be safe for treatment of non-ETEC causes of traveler's diarrhea. Two of 54 patients with Campylobacter enteritis had a clinical relapse after treatment that was associated with development of ciprofloxacin resistance. C1 WALTER REED ARMY MED CTR,DEPT ENTER INFECT,DIV PREVENT MED,WASHINGTON,DC 20307. WALTER REED ARMY MED CTR,DIV COMMUN DIS & IMMUNOL,WASHINGTON,DC 20307. MADIGAN ARMY MED CTR,PREVENT MED SERV,FT LEWIS,MD. USN,INST MED RES,BETHESDA,MD 20814. ARMED FORCES RES INST MED SCI,DEPT BACTERIOL,BANGKOK,THAILAND. USN,MED RES UNIT 2,MANILA,PHILIPPINES. NR 12 TC 111 Z9 111 U1 1 U2 2 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 1992 VL 165 IS 3 BP 557 EP 560 PG 4 WC Immunology; Infectious Diseases; Microbiology SC Immunology; Infectious Diseases; Microbiology GA HE466 UT WOS:A1992HE46600024 PM 1538160 ER PT J AU HAWKINS, RE RICKMAN, LS VERMUND, SH CARL, M AF HAWKINS, RE RICKMAN, LS VERMUND, SH CARL, M TI ASSOCIATION OF MYCOPLASMA AND HUMAN-IMMUNODEFICIENCY-VIRUS INFECTION - DETECTION OF AMPLIFIED MYCOPLASMA-FERMENTANS DNA IN BLOOD SO JOURNAL OF INFECTIOUS DISEASES LA English DT Note ID GENITAL MYCOPLASMAS; URETHRITIS; MEN AB A cross-sectional study was undertaken to determine the prevalence of Mycoplasma fermentans infection in patients with human immunodeficiency virus (HIV) infection using polymerase chain reaction methodology. Targeted M. fermentans DNA sequences could be amplified from the DNA extracted from the blood of 6 (11%) of 55 HIV-seropositive patients but from none of 26 HIV-seronegative subjects at low risk for HIV infection (P = .17). There was no correlation between M. fermentans infection and HIV clinical stage. There was a nonsignificant trend toward an association between M. fermentans infection and a history of syphilis. Infection with M. fermentans may occur more commonly in HIV-infected patients; however, a role as a copathogen or opportunistic infection was not established in this study. C1 NATL NAVAL MED CTR, DEPT INTERNAL MED, DIV INFECT DIS, BETHESDA, MD 20814 USA. USN, INST MED RES, DEPT INFECT DIS, ACCELERATED PROD DEV PROGRAM, BETHESDA, MD 20814 USA. NIAID, DIV AIDS, EPIDEMIOL BRANCH, BETHESDA, MD 20892 USA. UNIV CALIF SAN DIEGO, DIV INFECT DIS, LA JOLLA, CA 92093 USA. OI Vermund, Sten/0000-0001-7289-8698 NR 15 TC 53 Z9 55 U1 0 U2 1 PU UNIV CHICAGO PRESS PI CHICAGO PA 5720 S WOODLAWN AVE, CHICAGO, IL 60637 SN 0022-1899 J9 J INFECT DIS JI J. Infect. Dis. PD MAR PY 1992 VL 165 IS 3 BP 581 EP 585 PG 5 WC Immunology; Infectious Diseases; Microbiology SC Immunology; Infectious Diseases; Microbiology GA HE466 UT WOS:A1992HE46600030 PM 1538164 ER PT J AU TJENG, LH IDZERDA, YU RUDOLF, P SETTE, F CHEN, CT AF TJENG, LH IDZERDA, YU RUDOLF, P SETTE, F CHEN, CT TI SOFT-X-RAY MAGNETIC CIRCULAR-DICHROISM - A NEW TECHNIQUE FOR PROBING MAGNETIC-PROPERTIES OF MAGNETIC-SURFACES AND ULTRATHIN FILMS SO JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS LA English DT Article ID NI FILMS; SYNCHROTRON RADIATION; ELECTRONIC-PROPERTIES; SPIN POLARIZATION; CRYSTAL CURRENT; ABSORPTION; OVERLAYER; CU(100); GROWTH; METALS AB We demonstrate the feasibility of applying the novel soft-X-ray magnetic circular dichroism (SXMCD) technique to investigate the magnetic properties of magnetic surfaces and ultrathin films. Measurements have been carried out on Ni films ot various thickness on a Cu(100) substrate at the Ni L2.3 absorption edges. The SXMCD data exhibit strong temperature and thickness dependence, giving film thickness dependent Curie temperatures and suggesting that a single monolayer of Ni on a Cu(100) substrate may be non-magnetic. C1 USN,RES LAB,WASHINGTON,DC 20375. RP TJENG, LH (reprint author), AT&T BELL LABS,MURRAY HILL,NJ 07974, USA. RI Rudolf, Petra/E-6434-2014 OI Rudolf, Petra/0000-0002-4418-1769 NR 33 TC 70 Z9 70 U1 1 U2 5 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 MAR PY 1992 VL 109 IS 2-3 BP 288 EP 292 DI 10.1016/0304-8853(92)91762-I PG 5 WC Materials Science, Multidisciplinary; Physics, Condensed Matter SC Materials Science; Physics GA HP060 UT WOS:A1992HP06000024 ER PT J AU MCGINNIS, WC BRIGGS, JS AF MCGINNIS, WC BRIGGS, JS TI PROPERTIES OF BI2SR2CACU2O8 THICK-FILMS MELT-PROCESSED AT TEMPERATURES UP TO 950-DEGREES-C SO JOURNAL OF MATERIALS RESEARCH LA English DT Article ID TRANSPORT CRITICAL CURRENT; HIGH-TC SUPERCONDUCTORS; CRITICAL CURRENT-DENSITY; FLUX CREEP; OXIDE SUPERCONDUCTORS; Y1BA2CU3O7-DELTA; MODEL; YBA2CU3O7-DELTA; JC AB Thick Bi2Sr2CaCu2O8 films have been produced by melting Bi2Sr2CaCu2O8 powder on MgO substrates at temperatures just above the melting temperature of the powder. X-ray diffraction measurements indicate enhanced c-axis alignment throughout the thickness of the films. Films melted at 900-degrees-C show greater alignment and contain less Bi2Sr2CuO6 compared to those processed at 950-degrees-C. Both the degree of alignment and the Bi2Sr2CuO6 content increase as the cooling rate is decreased. Transport measurements show that films quickly cooled from low melt-processing temperatures have the highest critical current densities (J(c) = 13 kA/cm2 at 30 K). The temperature dependence of J(c) is best described by a flux creep model. Finally, J(c) at 4.2 K (in both parallel and perpendicular magnetic fields) undergoes a sudden drop at low fields, but levels off above 0.5 T to about 30% of the zero field value. RP MCGINNIS, WC (reprint author), USN,CTR OCEAN SYST,CODE 573,SAN DIEGO,CA 92152, USA. NR 26 TC 22 Z9 22 U1 0 U2 0 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 1992 VL 7 IS 3 BP 585 EP 591 DI 10.1557/JMR.1992.0585 PG 7 WC Materials Science, Multidisciplinary SC Materials Science GA HH520 UT WOS:A1992HH52000011 ER PT J AU AILES, MC BROWN, LJ CHURCH, C FRENCH, DP GALE, W AF AILES, MC BROWN, LJ CHURCH, C FRENCH, DP GALE, W TI MECHANICAL CONTROL OF GREENHEAD FLIES (DIPTERA, TABANIDAE) IN A MARSH ENVIRONMENT SO JOURNAL OF MEDICAL ENTOMOLOGY LA English DT Article DE INSECTA; TABANUS SPP; CONTROL; TRAPPING ID TRAPS AB The effectiveness of New Jersey box traps for the control of adult greenhead flies, Tabanus nigrovittatus, Macquart, T. conterminus Walker, was assessed at Wallops Island, Va. Trap shape and placement were tested. Shallow (0.45 m high) traps caught significantly fewer flies than cubic (0.60 m high) traps. Traps located in the inner two of four layers of traps caught fewer flies than traps in the outer layers. C1 PUBL WORKS OFF,AEGIS COMBAT SYST CTR,WALLOPS ISL,VA 23337. UNIV MISSOURI,DEPT ENTOMOL,COLUMBIA,MO 65211. USN,AIR STN,CTR DIS VECTOR ECOL & CONTROL,JACKSONVILLE,FL 32212. RP AILES, MC (reprint author), USN,CTR SURFACE WARFARE,WALLOPS ISL,VA 23337, USA. NR 12 TC 3 Z9 3 U1 0 U2 2 PU ENTOMOL SOC AMER PI LANHAM PA 9301 ANNAPOLIS RD, LANHAM, MD 20706 SN 0022-2585 J9 J MED ENTOMOL JI J. Med. Entomol. PD MAR PY 1992 VL 29 IS 2 BP 160 EP 164 PG 5 WC Entomology; Veterinary Sciences SC Entomology; Veterinary Sciences GA HG772 UT WOS:A1992HG77200004 PM 1495023 ER PT J AU TURNER, DC GABER, BP AF TURNER, DC GABER, BP TI A CRYSTALLOGRAPHIC MOLECULAR LATTICE BUILDER APPLIED TO MODEL LIPID BILAYERS SO JOURNAL OF MOLECULAR GRAPHICS LA English DT Article DE LIPID; MEMBRANE; BILAYER; CRYSTAL AB It is often desirable for noncrystallographers to generate graphical models of three-dimensional crystal structures based on published coordinates of the atoms that make up the crystallographic unit cells. This type of visualization is particularly important for small-molecule crystals, such as lipid crystals, where one may be interested in investigating interactions between the individual molecules in addition to their conformations. BILAYER BUILDER is a program that generates a portion of the entire crystal structure from the coordinates of the molecules in a single unit cell. It gives users of small desktop computers, such as the Apple Macintosh, the capability to generate and examine model crystal structures with a molecular graphics display program. BILAYER BUILDER stores the crystal coordinates in a Brookhaven Protein Data Bank file format for possible use in a variety of applications on many different computers. Initially, it was written for use with lipid crystals and bilayers but may be used for building an assortment of molecular crystals. C1 USN,RES LAB,CTR BIOMOLEC SCI & ENGN,CODE 6090,WASHINGTON,DC 20375. NR 7 TC 0 Z9 0 U1 0 U2 1 PU BUTTERWORTH-HEINEMANN PI WOBURN PA 225 WILDWOOD AVE #UNITB PO BOX 4500, WOBURN, MA 01801-2084 SN 0263-7855 J9 J MOL GRAPHICS JI J. Mol. Graph. PD MAR PY 1992 VL 10 IS 1 BP 29 EP & DI 10.1016/0263-7855(92)80006-Y PG 0 WC Biochemical Research Methods; Biochemistry & Molecular Biology; Computer Science, Interdisciplinary Applications; Crystallography; Mathematical & Computational Biology SC Biochemistry & Molecular Biology; Computer Science; Crystallography; Mathematical & Computational Biology GA HJ482 UT WOS:A1992HJ48200005 PM 1504050 ER PT J AU HOFFARTHZELLOE, M AF HOFFARTHZELLOE, M TI RESOLVING THE PARADOX - AN INTERLINEAR READING OF MORRISON,TONI 'SULA' SO JOURNAL OF NARRATIVE TECHNIQUE LA English DT Article ID AMERICAN; GENDER RP HOFFARTHZELLOE, M (reprint author), USN ACAD,ANNAPOLIS,MD 21402, USA. NR 20 TC 1 Z9 1 U1 0 U2 0 PU EASTERN MICHIGAN UNIV PI YPSILANTI PA DEPT ENGLISH, YPSILANTI, MI 48197 SN 0022-2925 J9 J NARRATIVE TECH JI J. Narrat. Tech. PD SPR PY 1992 VL 22 IS 2 BP 114 EP 127 PG 14 WC Literature SC Literature GA JC194 UT WOS:A1992JC19400005 ER PT J AU WU, CT AF WU, CT TI IMPROVING REUSABILITY WITH ACTOR 4.0S PROTOCOL MECHANISM SO JOURNAL OF OBJECT-ORIENTED PROGRAMMING LA English DT Article C1 USN,DEPT COMP SCI,MONTEREY,CA 93940. NR 2 TC 0 Z9 0 U1 0 U2 0 PU SIGS PUBLICATIONS INC PI NEW YORK PA 588 BROADWAY SUITE 604, NEW YORK, NY 10012-5408 SN 0896-8438 J9 J OBJECT-ORIENT PROG JI J. Object-Oriented Program. PD MAR-APR PY 1992 VL 5 IS 1 BP 49 EP 51 PG 3 WC Computer Science, Software Engineering; Computer Science, Theory & Methods SC Computer Science GA HH510 UT WOS:A1992HH51000005 ER PT J AU PALMER, DS BARCO, MT BILLY, EJ AF PALMER, DS BARCO, MT BILLY, EJ TI TEMPERATURE EXTREMES PRODUCED ORALLY BY HOT AND COLD LIQUIDS SO JOURNAL OF PROSTHETIC DENTISTRY LA English DT Article AB Thermocycling in vitro is a common way of testing dental materials to aid in establishing suitability for in vivo use. There is no standard temperature range for dental material thermocycling. This research attempts to establish an appropriate temperature range by measuring extremes of temperature achieved orally in human volunteer subjects. By using an intraoral digital thermometer probe, 13 human subjects were observed as they drank very hot and cold liquids. The temperature extremes produced intraorally were measured and adjusted for possible error. The results of this study suggest that a range of O-degrees to 67-degrees-C may be appropriate for dental material thermocycling. C1 USN,SCH DENT,NATL NAVAL DENT CTR,DEPT PROSTHODONT,BETHESDA,MD 20814. USN,CAMP PENDLETON,CA. RP PALMER, DS (reprint author), USAF,HOSP CHANUTE,SGD,CHANUTE,IL 61868, USA. NR 11 TC 96 Z9 98 U1 0 U2 0 PU MOSBY-YEAR BOOK INC PI ST LOUIS PA 11830 WESTLINE INDUSTRIAL DR, ST LOUIS, MO 63146-3318 SN 0022-3913 J9 J PROSTHET DENT JI J. Prosthet. Dent. PD MAR PY 1992 VL 67 IS 3 BP 325 EP 327 DI 10.1016/0022-3913(92)90239-7 PG 3 WC Dentistry, Oral Surgery & Medicine SC Dentistry, Oral Surgery & Medicine GA HF661 UT WOS:A1992HF66100009 PM 1507094 ER PT J AU MAURER, JH AF MAURER, JH TI CHURCHILL NAVAL HOLIDAY - ARMS-CONTROL AND THE ANGLO-GERMAN NAVAL RACE, 1912-1914 SO JOURNAL OF STRATEGIC STUDIES LA English DT Article RP MAURER, JH (reprint author), USN,WAR COLL,DEPT STRATEGY,NEWPORT,RI 02840, USA. NR 40 TC 2 Z9 2 U1 0 U2 0 PU FRANK CASS CO LTD PI LONDON PA 11 GAINSBOROUGH ROAD, LONDON, ENGLAND E11 1RS SN 0140-2390 J9 J STRATEGIC STUD JI J. Strateg. Stud. PD MAR PY 1992 VL 15 IS 1 BP 102 EP 127 DI 10.1080/01402399208437475 PG 26 WC International Relations; Political Science SC International Relations; Government & Law GA HQ147 UT WOS:A1992HQ14700005 ER PT J AU COLLINS, MD EVANS, RB AF COLLINS, MD EVANS, RB TI A 2-WAY PARABOLIC EQUATION FOR ACOUSTIC BACKSCATTERING IN THE OCEAN SO JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA LA English DT Article ID DEPENDENT BENCHMARK PROBLEMS; WAVE-EQUATION; UNDERWATER ACOUSTICS; PENETRABLE BOTTOM; PROPAGATION; SCATTERING; MODEL; ROUGH; APPROXIMATION; INCLUDES AB The parabolic equation (PE) method is generalized to handle backscattered acoustic energy in the ocean. The two-way PE is based on the single-scattering approximation and the approach of two-way coupled modes in which range-dependent environments are approximated by a sequence of range-independent regions. At the vertical boundaries between regions, the solution of the two-way PE is required to satisfy two continuity conditions. The range derivative in one of the conditions is replaced by a higher-order PE depth operator. The reflected and transmitted fields that satisfy these conditions are computed with an efficient iteration scheme. The outgoing and incoming fields are propagated by two-way range marching. The two-way PE, which is presently implemented for two-dimensional problems, is a practical method for solving large-scale reverberation problems. The accuracy of the two-way PE is demonstrated by comparisons with reference solutions. The two-way PE is applied to simulate the localization of a source of backscattering using the method of back propagation. C1 SCI APPLICAT INT CORP,NEW LONDON,CT 06320. RP COLLINS, MD (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 53 TC 77 Z9 81 U1 0 U2 5 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 1992 VL 91 IS 3 BP 1357 EP 1368 DI 10.1121/1.402465 PG 12 WC Acoustics; Audiology & Speech-Language Pathology SC Acoustics; Audiology & Speech-Language Pathology GA HH965 UT WOS:A1992HH96500015 ER PT J AU SUITER, HR AF SUITER, HR TI PULSE LENGTH EFFECTS ON THE TRANSMISSIVITY OF BUBBLY WATER SO JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA LA English DT Article AB The passage of sound through bubbly water is strongly attenuated by scattering and absorption. Such attenuation is most severe around the frequency of resonance of individual bubbles. A bubble takes a finite time to ring up to steady-state conditions and continues to oscillate for a finite time after the driving pressure ceases. Low backscatter for short pulse lengths has been observed in near-surface seawater [Akulichev et al., Sov. Phys. Acoust. 32 (3), 177-180 (1986)]. An experiment is described that looked for a corresponding enhancement in transmission. Comparisons were made between the attenuations of brief waveform bursts and longer bursts. The center frequency of this experiment was 120 kHz. The bubbles were made by the electrolysis of fresh water in a small laboratory tank. For bursts from 6 to 20 cycles in duration, no difference in the attenuations was discerned in comparison with a 2.6-oscillation burst. RP SUITER, HR (reprint author), USN,CTR COASTAL SYST,CODE 2120,PANAMA CITY,FL 32407, USA. NR 5 TC 8 Z9 8 U1 0 U2 1 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0001-4966 J9 J ACOUST SOC AM JI J. Acoust. Soc. Am. PD MAR PY 1992 VL 91 IS 3 BP 1383 EP 1387 DI 10.1121/1.402468 PG 5 WC Acoustics; Audiology & Speech-Language Pathology SC Acoustics; Audiology & Speech-Language Pathology GA HH965 UT WOS:A1992HH96500018 ER PT J AU SMITH, GB FEUILLADE, C DELBALZO, DR FEUILLADE, C DELBALZO, DR AF SMITH, GB FEUILLADE, C DELBALZO, DR FEUILLADE, C DELBALZO, DR TI MATCHED-FIELD PROCESSING ENHANCEMENT IN A SHALLOW-WATER ENVIRONMENT BY INCOHERENT BROAD-BAND AVERAGING SO JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA LA English DT Article ID DEPTH ESTIMATION; LOCALIZATION; RANGE AB Incoherent broadband averaging is a method that uses the broadband nature of an acoustic source to acquire additional gain against ambient noise and to decrease background variance common to matched-field ambiguity surfaces. In this paper, the relationship between the performance of incoherent broadband averaging and averaging parameters (i.e., bandwidth and the number of ambiguity surfaces averaged) is explored, and general guidelines for choosing these parameters are described. Expressions relating environmental parameters to the width and spacing of the sidelobes are obtained. These expressions predict the minimum bandwidth needed for incoherent broadband averaging for the case where one sidelobe dominates. Computer simulations in a Pekeris waveguide using a simulated but realistic noise field are used to verify the theoretical results. The simulations confirm the existence of the minimum bandwidth below which no effective averaging occurs. If the bandwidth equals or exceeds the minimum bandwidth, measures of peak-to-background resolution expressed in units of the variance improve by 5 log(L), where L is the number of surfaces included in the average. C1 TECH RES & DEV INC,PENNSAUKEN,NJ 08109. RP SMITH, GB (reprint author), USN,OCEANOG & ATMOSPHER RES LAB,BAY ST LOUIS,MS 39529, USA. NR 16 TC 11 Z9 11 U1 0 U2 0 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0001-4966 J9 J ACOUST SOC AM JI J. Acoust. Soc. Am. PD MAR PY 1992 VL 91 IS 3 BP 1447 EP 1455 DI 10.1121/1.402476 PG 9 WC Acoustics; Audiology & Speech-Language Pathology SC Acoustics; Audiology & Speech-Language Pathology GA HH965 UT WOS:A1992HH96500026 ER PT J AU HOBBS, SL AF HOBBS, SL TI ASYMPTOTIC STATISTICS FOR LOCATION ESTIMATES OF ACOUSTIC-SIGNALS SO JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA LA English DT Article ID MUSIC AB The passive sonar problem is to estimate the location (bearing, range, depth, etc.) of an acoustic source with data from an array of sensors. The purpose of this paper is to give the asymptotic distribution of location estimates of the true source location under weak assumptions on the signal-processing method and the environmental noise in which the signal is embedded. The estimates of location are taken to be the peaks of the estimated array power output (e.g., the "ambiguity surface"), as usual, and the crucial assumption in the analysis is that the signal plus noise forms a strictly stationary stochastic process. The estimates are shown to be consistent, asymptotically normal, and the asymptotic covariance is given. The asymptotic standard deviation is found to be proportional to the inverse of the curvature of the array power output surface at the true source location and invariant under monotonic transformations of the array power. The use of these statistics is illustrated by the construction of an approximate confidence region for a true source location. RP HOBBS, SL (reprint author), USN,CTR OCEAN SYST,SIGNAL PROC TECHNOL BRANCH,CODE 733,SAN DIEGO,CA 92152, USA. NR 13 TC 2 Z9 2 U1 0 U2 0 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0001-4966 J9 J ACOUST SOC AM JI J. Acoust. Soc. Am. PD MAR PY 1992 VL 91 IS 3 BP 1538 EP 1544 DI 10.1121/1.402486 PG 7 WC Acoustics; Audiology & Speech-Language Pathology SC Acoustics; Audiology & Speech-Language Pathology GA HH965 UT WOS:A1992HH96500037 ER PT J AU DIVITA, JC HANNA, TE AF DIVITA, JC HANNA, TE TI HUMAN-EFFICIENCY FOR VISUAL DETECTION OF TARGETS ON CATHODE-RAY TUBE DISPLAYS USING A 2-LEVEL MULTIPLE-CHANNEL TIME HISTORY FORMAT SO JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA LA English DT Article AB Human observers were tested for their ability to detect targets on visual displays. The displays simulated the multiple-channel time history format, using two levels of intensity encoding. A target was presented on 50% of the trials at a constant bearing. Observers indicated their judgment as to whether a target was present by using a four-category rating scale. Receiver-operating characteristics (ROCs) were generated from the rating data and compared to ROCs for an optimal detector. In experiment I, data were collected for two signal-to-noise ratios and for 32, 64, and 128 lines of data. Results indicated that observers were 3-5 dB less sensitive than an optimal detector. Performance improved as the number of lines increased but not to the extent predicted by optimal integration of information across lines of the display. In experiment II, the bearing at which subjects judged whether a target was present, was clearly delineated from the background by encoding information presented at this bearing in red. The purpose of experiment II was to determine the degree to which human inefficiency in detecting targets is due to the inability to focus on a single column of data. Subject performance improved when the red encoding was utilized, but subjects still performed 2 dB below ideal. This suggests that subjects use a suboptimal decision rule for judging the presence of the target. RP DIVITA, JC (reprint author), USN,SUBMARINE MED RES LAB,BOX 900,NAVAL SUBMARINE BASE,GROTON,CT 06340, USA. NR 8 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 1992 VL 91 IS 3 BP 1552 EP 1564 DI 10.1121/1.402436 PG 13 WC Acoustics; Audiology & Speech-Language Pathology SC Acoustics; Audiology & Speech-Language Pathology GA HH965 UT WOS:A1992HH96500039 PM 1564193 ER PT J AU DUBBELDAY, PS AF DUBBELDAY, PS TI POISSONS RATIO OF FOAMED ALUMINUM DETERMINED BY LASER DOPPLER VIBROMETRY SO JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA LA English DT Article AB Foamed aluminum is a promising candidate in hydroacoustics as a possible pressure-release material. Previously, the measurement of its dynamic shear modulus has been reported for various densities and pore sizes of the material, [Proc. IEEE, 1985 Ultrasonics Symp. 2, 1052-1055 (1985)]. In an attempt to complete the characterization of the material, its Young's modulus and Poisson's ratio were measured by means of laser Doppler vibrometry. The lowest value for the rho-c product found was 0.20 SI Mrayl, about 15% of the rho-c product of water. Some of the samples appear to be anisotropic. An attempt was made to measure the five compliance coefficients of one foamed-aluminum type that follow from assuming uniaxial symmetry. The results did not conform to the relationships pertinent to this type of symmetry. RP DUBBELDAY, PS (reprint author), USN,RES LAB,UNDERWATER SOUND REFERENCE DETACHMENT,POB 568337,ORLANDO,FL 32856, USA. NR 17 TC 12 Z9 12 U1 0 U2 3 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0001-4966 J9 J ACOUST SOC AM JI J. Acoust. Soc. Am. PD MAR PY 1992 VL 91 IS 3 BP 1737 EP 1744 DI 10.1121/1.402453 PG 8 WC Acoustics; Audiology & Speech-Language Pathology SC Acoustics; Audiology & Speech-Language Pathology GA HH965 UT WOS:A1992HH96500056 ER PT J AU KAHN, M CHASE, M AF KAHN, M CHASE, M TI EFFECTS OF HEAT-TREATMENTS ON MULTILAYER PIEZOELECTRIC CERAMIC AIR COMPOSITES SO JOURNAL OF THE AMERICAN CERAMIC SOCIETY LA English DT Article ID PZT AB Ceramic-air composites were prepared from laminated and sintered tapes that contain ceramic powder in a binder matrix and that have carbon-containing "fugitive" inks screened onto them. The resulting laminates contained initially more than 50% by volume of organic material. This had to be eliminated ("burned out") before sintering. The results of thermogravimetric analyses demonstrated the frequent occurrence of exothermic reactions when the burnout was conducted in air. This was prevented by lowering the partial oxygen pressure, but only to a point where reducing conditions were prevented since the latter caused carbonization, incomplete burnout, and increased lead evaporation. This was particularly important when a heavy kiln load consumed a significant fraction of the available oxygen. Weight loss, X-ray fluorescence, and electrical parameter determinations were then used to optimize the burnout conditions. As a result it became possible to make ceramic-air composites that had consistent electrical behavior and that tolerated high hydrostatic pressures. C1 POTOMAC RES INC,ALEXANDRIA,VA 22312. RP KAHN, M (reprint author), USN,RES LAB,CODE 6374,WASHINGTON,DC 20375, USA. NR 13 TC 14 Z9 14 U1 0 U2 1 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 1992 VL 75 IS 3 BP 649 EP 656 DI 10.1111/j.1151-2916.1992.tb07854.x PG 8 WC Materials Science, Ceramics SC Materials Science GA HJ063 UT WOS:A1992HJ06300025 ER PT J AU KIMELDORF, G SAMPSON, AR WHITAKER, LR AF KIMELDORF, G SAMPSON, AR WHITAKER, LR TI MIN AND MAX SCORINGS FOR 2-SAMPLE ORDINAL DATA SO JOURNAL OF THE AMERICAN STATISTICAL ASSOCIATION LA English DT Article DE COCHRAN-ARMITAGE PROCEDURE; ISOTONIC REGRESSION; MONOTONE SCALES; ORDINAL DATA; SCORING; T-TEST; 2-SAMPLE PROBLEM ID CHI-SQUARE STATISTICS; CONTINGENCY-TABLES; TRANSFORMATIONS; INDEPENDENCE AB To analyze two-sample ordinal data, one must often assign some increasing numerical scores to the ordinal categories. The choice of appropriate scores in these types of analyses is often problematic. This article presents a new approach for reporting the results of such analyses. Using techniques of order-restricted inference, we obtain the minimum and maximum of standard two-sample test statistics over all possible assignments of increasing scores. If the range of the min and max values does not include the critical value for the test statistics, then we can immediately conclude that the result of the analysis remains the same no matter what choice of increasing scores is used. On the other hand, if the range includes a critical value, the choice of scores used in the analysis must be carefully justified. Numerous examples are given to clarify our approach. C1 USN,POSTGRAD SCH,DEPT OPERAT RES,MONTEREY,CA 93940. UNIV PITTSBURGH,DEPT MATH & STAT,PITTSBURGH,PA 15260. RP KIMELDORF, G (reprint author), UNIV TEXAS,PROGRAM MATH SCI,RICHARDSON,TX 75083, USA. NR 23 TC 28 Z9 28 U1 0 U2 1 PU AMER STATISTICAL ASSOC PI ALEXANDRIA PA 1429 DUKE ST, ALEXANDRIA, VA 22314 SN 0162-1459 J9 J AM STAT ASSOC JI J. Am. Stat. Assoc. PD MAR PY 1992 VL 87 IS 417 BP 241 EP 247 DI 10.2307/2290475 PG 7 WC Statistics & Probability SC Mathematics GA HF276 UT WOS:A1992HF27600031 ER PT J AU STREINZ, CC WAGNER, JW KRUGER, J MORAN, PJ AF STREINZ, CC WAGNER, JW KRUGER, J MORAN, PJ TI ANALYSIS OF PASSIVE FILM GROWTH BY DYNAMIC IMAGING MICROELLIPSOMETRY SO JOURNAL OF THE ELECTROCHEMICAL SOCIETY LA English DT Article ID STAINLESS-STEEL; ANODIC OXIDE; ELLIPSOMETRY; ALLOYS; IRON AB Dynamic imaging microellipsometry (DIM) is a full field, radiometric approach to ellipsometry that provides high spatial resolution and accuracy. This paper reports on the latest DIM system and demonstrates the usefulness of the DIM technique for in situ examination of passive film growth on materials with microstructural inhomogeneities. In particular DIM has been utilized to examine passive film growth on a polycrystalline iron sample and an aluminium tantalum alloy that contained intermetallic precipitates. Grain orientation has been observed to affect the growth rate and final thickness of the film on iron. Ellipsometric identification of intermetallic precipitates (approximately 20-mu-m in diameter) is reported. The precipitates are observed to form a thinner passive film than the matrix. The incompatibility between the film over the precipitate and that over the matrix may degrade the localized corrosion behavior of these alloys. C1 USN ACAD,DEPT MECH ENGN,ANNAPOLIS,MD 21402. RP STREINZ, CC (reprint author), JOHNS HOPKINS UNIV,DEPT MAT SCI & ENGN,BALTIMORE,MD 21218, USA. NR 34 TC 10 Z9 10 U1 0 U2 5 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 MAR PY 1992 VL 139 IS 3 BP 711 EP 715 DI 10.1149/1.2069289 PG 5 WC Electrochemistry; Materials Science, Coatings & Films SC Electrochemistry; Materials Science GA HH077 UT WOS:A1992HH07700014 ER PT J AU SAMADDAR, SN AF SAMADDAR, SN TI TRANSIENT RADIATION OF A SINGLE-CYCLE SINUSOIDAL PULSE FROM A THIN DIPOLE SO JOURNAL OF THE FRANKLIN INSTITUTE-ENGINEERING AND APPLIED MATHEMATICS LA English DT Article AB The behavior of the radiated electric field from a half-wave dipole in free space excited by a single-cycle sinusoidal voltage is studied. The zero-order approximate solution for the current along the antenna in the frequency domain is used, so that the time-dependent current as well as the radiated electric field can be calculated and interpreted easily. Under a suitable matched condition, the time dependent current along each half-section of the dipole is made up of a current pulse traveling from the feed-point and a reflected one from the end-point. However, the radiated electric field consists of five overlapping signals exhibiting that radiation takes place only from the discontinuities of the dipole antenna. Both current and the radiated electric field are extended in time due to the reflection of current from the end-points of the dipole antenna. It appears that the spectral bandwidth of the radiated electric field is narrower than that of the exciting voltage pulse. This phenomenon may be due to the filtering effect of the half-wave dipole. RP SAMADDAR, SN (reprint author), USN,RES LAB,DIV RADAR,RADAR ANAL BRANCH,WASHINGTON,DC 20375, USA. NR 7 TC 7 Z9 7 U1 0 U2 1 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0016-0032 J9 J FRANKLIN I JI J. Frankl. Inst.-Eng. Appl. Math. PD MAR PY 1992 VL 329 IS 2 BP 259 EP 271 DI 10.1016/0016-0032(92)90032-C PG 13 WC Automation & Control Systems; Engineering, Multidisciplinary; Engineering, Electrical & Electronic; Mathematics, Interdisciplinary Applications SC Automation & Control Systems; Engineering; Mathematics GA HL147 UT WOS:A1992HL14700005 ER PT J AU CHALMERS, RH AF CHALMERS, RH TI TAILORING SHIPBOARD ENVIRONMENTAL SPECIFICATIONS .1. INTRODUCTION, TEMPERATURE, HUMIDITY, AND SHOCK SO JOURNAL OF THE IES LA English DT Article DE NAVAL SHIPS; SURFACE COMBATANTS; SHIPBOARD ENVIRONMENTS; TAILORING; REQUIREMENTS; SPECIFICATIONS; TEMPERATURE; HUMIDITY; MEASURED LEVELS; TEST DESIGN AB This article, the first of a three-part series, was extracted from Technical Document (TD 2071) published by the Naval Ocean Systems Center in April 1991. Titled "Tailoring Shipboard Environmental Specifications, A Guide "for Navy Program Managers," the document presents a compilation of shipboard environmental data measured over the years. The applicability of the data to the fleet of today is discussed. Methods of tailoring systems specifications and tests for the environments existing at given locations on a variety of Naval ships are also discussed. This article contains the Introduction, Temperature and Humidity, and Shock sections of TD 2071. Part II of this series will cover part of the TD 2071 treatment of Vibration. Part III will conclude Vibration and include Discussions and Conclusions. It also will present a tailored vibration requirement that a program manager might include in a procurement package for new shipboard systems. RP CHALMERS, RH (reprint author), USN,CTR OCEAN SYST,SAN DIEGO,CA 92152, USA. NR 0 TC 0 Z9 0 U1 0 U2 1 PU INST ENVIRONMENTAL SCI PI MT PROSPECT PA 940 E NORTHWEST HIGHWAY, MT PROSPECT, IL 60056 SN 1052-2883 J9 J IES JI J. IES PD MAR-APR PY 1992 VL 35 IS 2 BP 25 EP 36 PG 12 WC Engineering, Environmental; Environmental Sciences; Instruments & Instrumentation SC Engineering; Environmental Sciences & Ecology; Instruments & Instrumentation GA HP678 UT WOS:A1992HP67800004 ER PT J AU WU, C KARPOUZIAN, G KIANG, RL AF WU, C KARPOUZIAN, G KIANG, RL TI THE OPTIMAL POWER PERFORMANCE OF AN ENDO-REVERSIBLE COMBINED CYCLE SO JOURNAL OF THE INSTITUTE OF ENERGY LA English DT Article AB An optimal-performance analysis of an endo-reversible combined cycle (two single endo-reversible cycles in a cascade) was carried out, and the maximum power and the efficiency at maximum power for steady-state operation were obtained. These two performance factors, measured against those of a single cycle, can be expressed in terms of two design parameters, and the consequences of varying one parameter were examined in detail. It was shown that as regards efficiency the combined cycle is superior to the single cycle for all values of that design parameter; and as regards power output, only beyond a certain value of that parameter is the combined cycle superior to the single cycle. RP WU, C (reprint author), USN ACAD,DEPT MECH ENGN,ANNAPOLIS,MD 21402, USA. NR 0 TC 9 Z9 9 U1 0 U2 0 PU INST ENERGY PI LONDON PA 18 DEVONSHIRE ST PORTLAND PLACE, LONDON, ENGLAND W1N 2AU SN 0144-2600 J9 J I ENERGY JI J. Inst. Energy PD MAR PY 1992 VL 65 IS 462 BP 41 EP 45 PG 5 WC Energy & Fuels SC Energy & Fuels GA HQ335 UT WOS:A1992HQ33500007 ER PT J AU MCLEAN, EA LEE, TN STAMPER, JA MANKA, CK GRIEM, HR AF MCLEAN, EA LEE, TN STAMPER, JA MANKA, CK GRIEM, HR TI MEASUREMENTS ON COLLISIONALLY EXCITED SOFT-X-RAY LASERS SO JOURNAL OF THE OPTICAL SOCIETY OF AMERICA B-OPTICAL PHYSICS LA English DT Article ID ISOELECTRONIC SEQUENCE; PLASMA; AMPLIFICATION; FOIL; TARGETS; GAIN; FILAMENTATION; GERMANIUM; EMISSION; NE AB We observed, for the first time to our knowledge, soft-x-ray 3p-3s lasing in neonlike zinc and arsenic in the wavelength interval 212-267 angstrom, with gain coefficients ranging from 2.0 to 5.4 cm-1. Also, spectral lines were observed in neonlike gallium at the wavelengths predicted for lasing. A single-beam, driving laser (lambda = 1.05-mu-m) at pulse energies of up to 500 J, with rise times of approximately 0.6 ns and pulse durations of 1-2 ns, was used with slab targets. Time-integrated diagnostics were used. We discuss the refractive bending of the lasing beams, the importance of the rise time of the driving laser pulse, and the interferometric measurement of the electron density gradients and density distributions of the lasant plasma. RP MCLEAN, EA (reprint author), USN,RES LAB,DIV PLASMA PHYS,SPACE PLASMA BRANCH,WASHINGTON,DC 20375, USA. NR 39 TC 18 Z9 18 U1 0 U2 1 PU OPTICAL SOC AMER PI WASHINGTON PA 2010 MASSACHUSETTS AVE NW, WASHINGTON, DC 20036 SN 0740-3224 J9 J OPT SOC AM B JI J. Opt. Soc. Am. B-Opt. Phys. PD MAR PY 1992 VL 9 IS 3 BP 350 EP 359 DI 10.1364/JOSAB.9.000350 PG 10 WC Optics SC Optics GA HG733 UT WOS:A1992HG73300007 ER PT J AU KATZER, DS GAMMON, D SHANABROOK, BV AF KATZER, DS GAMMON, D SHANABROOK, BV TI MODIFICATION OF THE MICROROUGHNESS OF MOLECULAR-BEAM EPITAXIALLY GROWN GAAS/ALAS INTERFACES THROUGH CHANGES IN THE GROWTH TEMPERATURE SO JOURNAL OF VACUUM SCIENCE & TECHNOLOGY B LA English DT Article; Proceedings Paper CT 11TH WORKSHOP ON MOLECULAR-BEAM EPITAXY CY SEP 16-18, 1991 CL UNIV TEXAS AUSTIN, AUSTIN, TX SP AMER VACUUM SOC HO UNIV TEXAS AUSTIN ID SEMICONDUCTOR INTERFACES; QUANTUM WELLS AB The interfacial properties of a series of GaAs/AlAs quantum wells (QWs) grown by molecular-beam epitaxy is examined using photoluminescence (PL). These high-quality QWs show splittings in the free exciton peaks, which indicate that large scale island structures exist at the interfaces. By changing the growth temperature we are able to shift the absolute energies of the excitons while keeping the same PL linewidths and lineshapes. Since the absolute energies of the excitons depend only on the GaAs and AlAs material parameters, we conclude that we are able to modify the small scale structure of the interfaces within the large scale islands by changing the growth temperature. RP KATZER, DS (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. RI Katzer, D. Scott/N-7841-2013 NR 12 TC 8 Z9 8 U1 0 U2 1 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 1071-1023 J9 J VAC SCI TECHNOL B JI J. Vac. Sci. Technol. B PD MAR-APR PY 1992 VL 10 IS 2 BP 800 EP 802 DI 10.1116/1.586119 PG 3 WC Engineering, Electrical & Electronic; Nanoscience & Nanotechnology; Physics, Applied SC Engineering; Science & Technology - Other Topics; Physics GA HN270 UT WOS:A1992HN27000042 ER PT J AU YOUNGDALE, ER MEYER, JR HOFFMAN, CA BARTOLI, FJ THOMPSON, PE DAVIS, JL AF YOUNGDALE, ER MEYER, JR HOFFMAN, CA BARTOLI, FJ THOMPSON, PE DAVIS, JL TI NONLINEAR OPTICAL-PROPERTIES OF INSB1-XASX-BASED ALLOYS AND SUPERLATTICES SO JOURNAL OF VACUUM SCIENCE & TECHNOLOGY B LA English DT Article; Proceedings Paper CT 11TH WORKSHOP ON MOLECULAR-BEAM EPITAXY CY SEP 16-18, 1991 CL UNIV TEXAS AUSTIN, AUSTIN, TX SP AMER VACUUM SOC HO UNIV TEXAS AUSTIN ID 10 MU-M; COEFFICIENTS AB We report the first observation of in-band optical nonlinearities in III-V semiconductors at CO2 wavelengths, obtained from nondegenerate four-wave mixing experiments on both InSb1-xAsx alloy layers and InSb1-xAsx-InSb strained-layer superlattices. An alloy of composition near that for the minimum energy gap (x = 0.43) was found to have a large chi(3) at 300 K (> 10(-5) esu). While the nonlinearity in the alloy saturated at high intensities due to the dynamic Burstein shift, results for an InSb0.83As0.17-InSb superlattice showed no evidence for saturation at intensities up to 5 x 10(5) W/cm2. Theoretical arguments predict that one should expect type-II superlattices such as InSb1-xAsx-InSb to be superior to previously studied nonlinear materials with regard to combining large chi(3) with small absorption coefficient and large saturation threshold. C1 USN,RES LAB,DIV ELECTR SCI & TECHNOL,WASHINGTON,DC 20375. RP YOUNGDALE, ER (reprint author), USN,RES LAB,DIV OPT SCI,WASHINGTON,DC 20375, USA. NR 15 TC 2 Z9 2 U1 1 U2 1 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 1071-1023 J9 J VAC SCI TECHNOL B JI J. Vac. Sci. Technol. B PD MAR-APR PY 1992 VL 10 IS 2 BP 885 EP 887 DI 10.1116/1.586143 PG 3 WC Engineering, Electrical & Electronic; Nanoscience & Nanotechnology; Physics, Applied SC Engineering; Science & Technology - Other Topics; Physics GA HN270 UT WOS:A1992HN27000066 ER PT J AU WATERMAN, JR SHANABROOK, BV WAGNER, RJ AF WATERMAN, JR SHANABROOK, BV WAGNER, RJ TI REFLECTION HIGH-ENERGY ELECTRON-DIFFRACTION STUDY OF SB INCORPORATION DURING MOLECULAR-BEAM EPITAXY GROWTH OF GASB AND ALSB SO JOURNAL OF VACUUM SCIENCE & TECHNOLOGY B LA English DT Article; Proceedings Paper CT 11TH WORKSHOP ON MOLECULAR-BEAM EPITAXY CY SEP 16-18, 1991 CL UNIV TEXAS AUSTIN, AUSTIN, TX SP AMER VACUUM SOC HO UNIV TEXAS AUSTIN ID INTENSITY OSCILLATIONS; MBE GROWTH; INAS; GAAS AB The incorporation of antimony into GaSb and AlSb during molecular-beam epitaxy growth has been investigated using reflection high-energy electron diffraction (RHEED). RHEED intensity oscillations limited by the incorporation rate of Sb were observed. The RHEED oscillation measurements together with beam equivalent pressure measurements demonstrate that four Sb atoms are incorporated for each Sb4 molecule incident on the surfaces of GaSb and AlSb for substrate temperatures ranging from 350 to 530-degrees-C and 420 to 610-degrees-C, respectively. A new Ga stabilized (4 x 3) surface reconstruction was observed for (100) GaSb. RP WATERMAN, JR (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 11 TC 17 Z9 17 U1 0 U2 3 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 1071-1023 J9 J VAC SCI TECHNOL B JI J. Vac. Sci. Technol. B PD MAR-APR PY 1992 VL 10 IS 2 BP 895 EP 897 DI 10.1116/1.586146 PG 3 WC Engineering, Electrical & Electronic; Nanoscience & Nanotechnology; Physics, Applied SC Engineering; Science & Technology - Other Topics; Physics GA HN270 UT WOS:A1992HN27000069 ER PT J AU HOFFMAN, CA MEYER, JR BARTOLI, FJ LANSARI, Y COOK, JW SCHETZINA, JF AF HOFFMAN, CA MEYER, JR BARTOLI, FJ LANSARI, Y COOK, JW SCHETZINA, JF TI QUANTUM HALL-EFFECT IN HGTE-CDTE SUPERLATTICES WITH STRONG 3-DIMENSIONAL DISPERSION SO JOURNAL OF VACUUM SCIENCE & TECHNOLOGY B LA English DT Article; Proceedings Paper CT 11TH WORKSHOP ON MOLECULAR-BEAM EPITAXY CY SEP 16-18, 1991 CL UNIV TEXAS AUSTIN, AUSTIN, TX SP AMER VACUUM SOC HO UNIV TEXAS AUSTIN ID LOCALIZATION; TRANSPORT; ELECTRON; GAP AB We have studied the quantum Hall effect in modulation-doped HgTe-CdTe superlattices with electron concentrations in the range 8 x 10(15) less-than-or-equal-to n less-than-or-equal-to 3 x 10(17) cm-3. Since the quantum Hall phenomenon should in principle be restricted to two-dimensional systems, it is not surprising that the plateaus in the Hall conductivity (at multiples of almost-equal-to 200e2/h in the 200-period superlattices) and minima in the diagonal conductivity are most pronounced in samples with relatively thick barriers, i.e., when the energy bands have little dispersion in the growth direction. However, well-resolved quantum Hall features are also observed in thinner-well superlattices having miniband widths of up to 17 meV. While present phenomenological models can account for this as long as the Landau level spacing is large compared to the miniband width, it is surprising that broad lowest-order plateaus are also evident in data for two superlattices having little or no gap between adjacent levels. Possible implications of this finding are discussed. C1 N CAROLINA STATE UNIV,RALEIGH,NC 27695. RP HOFFMAN, CA (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 10 TC 7 Z9 7 U1 0 U2 1 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 1071-1023 J9 J VAC SCI TECHNOL B JI J. Vac. Sci. Technol. B PD MAR-APR PY 1992 VL 10 IS 2 BP 905 EP 908 DI 10.1116/1.586149 PG 4 WC Engineering, Electrical & Electronic; Nanoscience & Nanotechnology; Physics, Applied SC Engineering; Science & Technology - Other Topics; Physics GA HN270 UT WOS:A1992HN27000072 ER PT J AU STEINER, TD HENGEHOLD, RL YEO, YK GODBEY, DJ THOMPSON, PE POMRENKE, GS AF STEINER, TD HENGEHOLD, RL YEO, YK GODBEY, DJ THOMPSON, PE POMRENKE, GS TI NEAR BAND-EDGE PHOTOLUMINESCENCE FROM SI1-XGEX/SI SUPERLATTICES GROWN BY MOLECULAR-BEAM EPITAXY SO JOURNAL OF VACUUM SCIENCE & TECHNOLOGY B LA English DT Article; Proceedings Paper CT 11TH WORKSHOP ON MOLECULAR-BEAM EPITAXY CY SEP 16-18, 1991 CL UNIV TEXAS AUSTIN, AUSTIN, TX SP AMER VACUUM SOC HO UNIV TEXAS AUSTIN ID STRAINED-LAYER SUPERLATTICES; SI-GE ALLOYS; GAP; LUMINESCENCE AB Sharp, well-resolved near band-edge photoluminescence (PL) has been observed from long-period Si1-xGex/Si superlattices grown by molecular-beam epitaxy, including PL from a 120 angstrom Si/40 angstrom Si1-xGex sample. The sharp PL is due to shallow bound excitons (BE), and consists of a no-phonon (NP) line as well as phonon-assisted lines. The exciton binding energies obtained from the temperature dependence of the BE(NP) lines are in the range of 4-6 meV. C1 USN,RES LAB,WASHINGTON,DC 20375. USAF,OFF SCI RES,WASHINGTON,DC 20332. RP STEINER, TD (reprint author), USAF,INST TECHNOL,WRIGHT PATTERSON AFB,OH 45433, USA. NR 19 TC 48 Z9 48 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 1992 VL 10 IS 2 BP 924 EP 926 DI 10.1116/1.586155 PG 3 WC Engineering, Electrical & Electronic; Nanoscience & Nanotechnology; Physics, Applied SC Engineering; Science & Technology - Other Topics; Physics GA HN270 UT WOS:A1992HN27000078 ER PT J AU BROERS, JLV JENSEN, SM TRAVIS, WD PASS, H WHITSETT, JA SINGH, G KATYAL, SL GAZDAR, AF MINNA, JD LINNOILA, RI AF BROERS, JLV JENSEN, SM TRAVIS, WD PASS, H WHITSETT, JA SINGH, G KATYAL, SL GAZDAR, AF MINNA, JD LINNOILA, RI TI EXPRESSION OF SURFACTANT ASSOCIATED PROTEIN-A AND CLARA CELL 10 KILODALTON MESSENGER-RNA IN NEOPLASTIC AND NONNEOPLASTIC HUMAN LUNG-TISSUE AS DETECTED BY INSITU HYBRIDIZATION SO LABORATORY INVESTIGATION LA English DT Article DE HUMAN LUNG CANCER; MESSENGER RNA DETECTION; PERIPHERAL AIRWAYS; DIFFERENTIATION ID PULMONARY SURFACTANT; MONOCLONAL-ANTIBODIES; SECRETORY PROTEINS; EPITHELIAL-CELLS; LOCALIZATION; APOPROTEINS; CARCINOMAS; CANCER; RAT; DIFFERENTIATION AB Two markers for the progenitor cells of peripheral airways and their tumors are the 10 kilodalton (kd) Clara cell protein and the major surfactant associated protein-A (SP-A). We used the RNA-RNA in situ hybridization technique to study expression of the genes encoding these proteins at the cellular level in 19 pairs of non-neoplastic and neoplastic tissues from resected human lungs. Our results show that in non-neoplastic lung tissue, the Clara 10 kd protein gene was expressed in nonciliated cells of both bronchial and bronchiolar epithelium, indicating that, in contrast to previous assumptions, cells with Clara cell-like differentiation in humans may not be restricted to bronchiolar cells. The incidence of Clara 10 kd protein gene expression, as detected in lung carcinomas (1 out of 19 cases positive) was less than expected based on previous ultrastructural reports. The SP-A gene was strongly expressed in normal alveolar type II cells in non-neoplastic lung and, at higher levels, in hyperplastic cells. In addition, SP-A mRNA expression was observed in scattered bronchial and bronchiolar epithelial cells in 40% of the airways examined. Five out of 17 lung tumors, all of which were adenocarcinomas, were positive for SP-A expression, albeit generally less intense than type II cells. This expression was seen in carcinomas with papillolepidic as well as solid and glandular growth patterns. Our findings provide new insights into the peripheral airway cell differentiation. C1 NCI,PATHOL LAB,BETHESDA,MD 20892. NCI,SURG BRANCH,BETHESDA,MD 20892. USN,NCI,ONCOL BRANCH,BETHESDA,MD 20814. UNIV CINCINNATI,COLL MED,DEPT PEDIAT,CINCINNATI,OH 45221. UNIV PITTSBURGH,SCH MED,PITTSBURGH,PA 15261. VET AFFAIRS MED CTR,DEPT PATHOL,PITTSBURGH,PA. UNIFORMED SERV UNIV HLTH SCI,BETHESDA,MD 20814. FU NHLBI NIH HHS [R01 HL108907] NR 46 TC 107 Z9 109 U1 0 U2 0 PU WILLIAMS & WILKINS PI BALTIMORE PA 351 WEST CAMDEN ST, BALTIMORE, MD 21201-2436 SN 0023-6837 J9 LAB INVEST JI Lab. Invest. PD MAR PY 1992 VL 66 IS 3 BP 337 EP 346 PG 10 WC Medicine, Research & Experimental; Pathology SC Research & Experimental Medicine; Pathology GA HJ326 UT WOS:A1992HJ32600009 PM 1311398 ER PT J AU NUCKOLS, ML AF NUCKOLS, ML TI PREPARING FOR OUR FUTURE OCEAN PRESENCE - OCEAN ENGINEERING AT THE UNITED-STATES NAVAL ACADEMY SO MARINE TECHNOLOGY SOCIETY JOURNAL LA English DT Article AB The ocean engineering curriculum at the U.S. Naval Academy provides our future Naval officers with a rigorous engineering program that uniquely qualifies them to meet the technic challenges created by the sea environment. Coupled with an intensive regimen of professional training in the classroom and at sea, the Naval Academy midshipmen are faced with a challenge that few college students will ever face. Although the program is designed specifically for developing future Naval officers, the basic approach is valid for any engineering school. The discipline, leadership training, and academic foundation that they receive prepare them for a lifetime of challenges in the inevitable resurgence of national interest in deep ocean technology. RP NUCKOLS, ML (reprint author), USN ACAD,DEPT NAVAL ARCHITECTURE OCEAN ENGN & MARINE ENGN,ANNAPOLIS,MD 21402, USA. NR 5 TC 0 Z9 0 U1 0 U2 0 PU MARINE TECHNOLOGY SOC INC PI WASHINGTON PA C/O I CLAYION MATTHEWS, 1828 L ST, NW, 9TH FL, WASHINGTON, DC 20036 SN 0025-3324 J9 MAR TECHNOL SOC J JI Mar. Technol. Soc. J. PD SPR PY 1992 VL 26 IS 1 BP 14 EP 21 PG 8 WC Engineering, Ocean; Oceanography SC Engineering; Oceanography GA HX357 UT WOS:A1992HX35700003 ER PT J AU SANGHERA, JS TSAI, T JEWELL, J JAGANATHAN, J AGGARWAL, ID AF SANGHERA, JS TSAI, T JEWELL, J JAGANATHAN, J AGGARWAL, ID TI 2-PHOTON ABSORPTION AT 5-EV IN A ZRF4-BASED GLASS SO MATERIALS LETTERS LA English DT Article AB The absorption coefficient of high-purity ZBLAN glass varies with power and fluence upon irradiation at 5 eV with an excimer laser. The change has been attributed to two-photon absorption. The magnitude of the two-photon absorption coefficient is determined to be 3.05 x 10(-9) cm/W. C1 USN,RES LAB,WASHINGTON,DC 20375. RP SANGHERA, JS (reprint author), GEOCENTERS INC,FT WASHINGTON,MD 20744, USA. NR 14 TC 2 Z9 2 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0167-577X J9 MATER LETT JI Mater. Lett. PD MAR PY 1992 VL 13 IS 2-3 BP 135 EP 138 DI 10.1016/0167-577X(92)90124-3 PG 4 WC Materials Science, Multidisciplinary; Physics, Applied SC Materials Science; Physics GA HN039 UT WOS:A1992HN03900014 ER PT J AU RANDLES, PW NEMES, JA AF RANDLES, PW NEMES, JA TI A CONTINUUM DAMAGE MODEL FOR THICK COMPOSITE-MATERIALS SUBJECTED TO HIGH-RATE DYNAMIC LOADING SO MECHANICS OF MATERIALS LA English DT Article ID MECHANICS AB A continuum damage model (CDM) is developed to study the response of thick laminated composite materials subjected to high-rate loading processes. A vector damage description is used to represent evolving modes of damage associated with certain orientations of brittle cracking of the matrix material. A simple maximum strain criterion is used for fiber breakage with no allowance for evolution. Phenomenological damage evolution equations are postulated in terms of the current state of damage, stress above a current threshold, and material properties controlling evolution rates, resulting in implicitly rate-dependent response. Specific threshold and evolution functions are postulated and used to illustrate the predictive capability of the model for homogeneous deformation fields. A comparison of results to available experimental data for rate-dependent behavior of graphite/epoxy laminated composites shows good agreement. RP RANDLES, PW (reprint author), USN,RES LAB,DIV MAT SCI & TECHNOL,MECH MAT BRANCH,WASHINGTON,DC 20375, USA. NR 14 TC 15 Z9 15 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 1992 VL 13 IS 1 BP 1 EP 13 DI 10.1016/0167-6636(92)90032-9 PG 13 WC Materials Science, Multidisciplinary; Mechanics SC Materials Science; Mechanics GA HL024 UT WOS:A1992HL02400001 ER PT J AU PARKER, RK ABRAMS, RH AF PARKER, RK ABRAMS, RH TI THE NAVY ROLE IN THE VACUUM-TUBE ELECTRONICS PROGRAM .1. THE TRI-SERVICE-PROGRAM SO MICROWAVE JOURNAL LA English DT Article C1 USN,EXPLORATORY DEV PROJECT VACUUM ELECTR,WASHINGTON,DC. USN,TRISERV DARPA VACUUM ELECTR STEERING GRP,WASHINGTON,DC. UNIV CALIF LOS ANGELES,DEPT DEF,ADVISORY GRP ELECTRON DEVICES,LOS ANGELES,CA 90024. UNIV CALIF LOS ANGELES,USAF,ADV THERMIONICS RES INITIAT PROGRAM,LOS ANGELES,CA 90024. USN,RES LAB,DIV ELECTR SCI & TECHNOL,VACUUM ELECTR BRANCH,WASHINGTON,DC 20375. RP PARKER, RK (reprint author), USN,RES LAB,DIV ELECTR SCI & TECHNOL,VACUUM ELECTR BRANCH,WASHINGTON,DC 20375, USA. NR 1 TC 1 Z9 1 U1 2 U2 2 PU HORIZON HOUSE-MICROWAVE PI NORWOOD PA 685 CANTON ST, NORWOOD, MA 02062 SN 0192-6225 J9 MICROWAVE J JI Microw. J. PD MAR PY 1992 VL 35 IS 3 BP 82 EP & PG 0 WC Engineering, Electrical & Electronic; Telecommunications SC Engineering; Telecommunications GA HK400 UT WOS:A1992HK40000004 ER PT J AU COVEY, DC WRIGHT, DG AF COVEY, DC WRIGHT, DG TI BONE HEALING BY INDUCTION - CLINICAL PERSPECTIVES SO MILITARY MEDICINE LA English DT Article AB Treatment of osseous defects by induced bone regeneration has yielded promising results in laboratory animals and in preliminary human trials. Two inducing agents, demineralized bone powder and bone morphogenetic protein, are being used clinically to treat some bony defects without the need for an autogenous bone-harvesting procedure. Such off-the-shelf bone-inducing agents may someday become a significant addition to the armamentarium of the military orthopedic surgeon for dealing with the numerous skeletal injuries which occur in today's service environment. RP COVEY, DC (reprint author), USN HOSP,DEPT ORTHOPAED SURG,BOONE RD,BREMERTON,WA 98312, USA. NR 0 TC 1 Z9 1 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 1992 VL 157 IS 3 BP 107 EP 109 PG 3 WC Medicine, General & Internal SC General & Internal Medicine GA HG831 UT WOS:A1992HG83100006 PM 1603397 ER PT J AU BLOOD, CG AF BLOOD, CG TI ANALYSES OF BATTLE CASUALTIES BY WEAPON TYPE ABOARD UNITED-STATES-NAVY WARSHIPS SO MILITARY MEDICINE LA English DT Article AB The number of casualties was determined for 513 incidents involving U.S. Navy warships sunk or damaged during World War II. Ship type and weapon were significant factors in determining the numbers of wounded and killed. Multiple weapon attacks and kamikazes yielded more wounded in action than other weapon types. Multiple weapons and torpedoes resulted in a higher incidence of killed in action than other weapons. Penetrating wounds and burns were the most prominent injury types. Kamikaze attacks yielded significantly more burns than incidents involving bombs, gunfire, torpedoes, mines, and multiple weapons. Mine explosions were responsible for more strains, sprains, and dislocations than the other weapon types. RP BLOOD, CG (reprint author), USN,HLTH RES CTR,DEPT MED DECIS SUPPORT,POB 85122,SAN DIEGO,CA 92186, USA. NR 0 TC 3 Z9 3 U1 0 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 MAR PY 1992 VL 157 IS 3 BP 124 EP 130 PG 7 WC Medicine, General & Internal SC General & Internal Medicine GA HG831 UT WOS:A1992HG83100012 PM 1603403 ER PT J AU JAGODA, A WEBB, T POTTER, B LEJEUNE, B AF JAGODA, A WEBB, T POTTER, B LEJEUNE, B TI ROLE OF THE INDEPENDENT DUTY CORPSMAN ON THE USNS COMFORT (T-AH 20) - THE OPERATION DESERT SHIELD DESERT STORM EXPERIENCE SO MILITARY MEDICINE LA English DT Article AB Independent duty corpsmen (IDCs) have a significant role in providing health care on the USNS Comfort (T-AH 20). The IDCs are responsible for staffing sick call, emergency response teams, and resuscitation/stabilization teams. IDCs are trained in advanced patient care and in medical administrative and logistical duties. During peacetime, their function often focuses on primary care to the decrement of skills necessary to perform in medical emergencies. The Operation Desert Shield/Desert Storm mobilization has emphasized the need for Navy medicine to continue its support of IDC training so that they are kept in a state of preparedness to competently deliver the full spectrum of care that is expected of them. RP JAGODA, A (reprint author), USN SHIP COMFORT T AH 20,DEPT MED SERV,FPO,NEW YORK,NY 09566, USA. NR 0 TC 1 Z9 1 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 1992 VL 157 IS 3 BP 136 EP 139 PG 4 WC Medicine, General & Internal SC General & Internal Medicine GA HG831 UT WOS:A1992HG83100014 PM 1603405 ER PT J AU WEBB, LX GROSSLING, S AF WEBB, LX GROSSLING, S TI EXERTIONAL COMPARTMENT SYNDROME IN A MARINE GRUNT SO MILITARY MEDICINE LA English DT Article AB Exercise-induced exertional compartment syndrome was first described by Vogt in 1945 as "march gangrene." The authors report a case of a 20-year-old United States Marine presenting with the florid findings of acute crural compartment syndrome. The patient's history of prior episodes of crural pain following long hikes led the authors to conclude that this patient had a chronic exertional compartment syndrome. RP WEBB, LX (reprint author), USN HOSP,CAMP LEJEUNE,JACKSONVILLE,NC, 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 MAR PY 1992 VL 157 IS 3 BP 154 EP 155 PG 2 WC Medicine, General & Internal SC General & Internal Medicine GA HG831 UT WOS:A1992HG83100020 PM 1603411 ER PT J AU KAUFMAN, RG AF KAUFMAN, RG TI THE UNITED-STATES AND NAVAL ARMS-CONTROL BETWEEN THE 2 WORLD WARS - IMPLICATIONS FOR CONTEMPORARY AND FUTURE ARMS-CONTROL SO MILLENNIUM-JOURNAL OF INTERNATIONAL STUDIES LA English DT Article AB This article examines the experience of inter-war naval arms control, and the lessons we can draw from it about the difficulties and dangers democracies face in arms control today. The author argues that Western arms negotiators must be wary of these dangers, particularly when dealing with non-democratic societies, if they are to avoid the errors of their predecessors. RP KAUFMAN, RG (reprint author), USN,COLL WAR,DEPT STRATEGY & POLICY,NEWPORT,RI 02841, USA. NR 64 TC 1 Z9 1 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 1992 VL 21 IS 1 BP 29 EP 52 PG 24 WC International Relations SC International Relations GA HY470 UT WOS:A1992HY47000002 ER PT J AU WIRTZ, JJ AF WIRTZ, JJ TI COMMAND IN CRISIS - 4 CASE-STUDIES - BOUCHARD,JF SO MILLENNIUM-JOURNAL OF INTERNATIONAL STUDIES LA English DT Book Review RP WIRTZ, JJ (reprint author), USN,SCH POSTGRAD,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 1992 VL 21 IS 1 BP 107 EP 109 PG 3 WC International Relations SC International Relations GA HY470 UT WOS:A1992HY47000007 ER PT J AU GRASSEY, T AF GRASSEY, T TI ELECTRONIC COMBAT AND MODERN WARFARE - MUNRO,N SO MILLENNIUM-JOURNAL OF INTERNATIONAL STUDIES LA English DT Book Review RP GRASSEY, T (reprint author), USN,SCH POSTGRAD,INTELLIGENCE STUDIES PROGRAM,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 1992 VL 21 IS 1 BP 127 EP 128 PG 2 WC International Relations SC International Relations GA HY470 UT WOS:A1992HY47000018 ER PT J AU THOMPSON, CB WANG, CY HO, IC BOHJANEN, PR PETRYNIAK, B JUNE, CH MIESFELDT, S ZHANG, L NABEL, GJ KARPINSKI, B LEIDEN, JM AF THOMPSON, CB WANG, CY HO, IC BOHJANEN, PR PETRYNIAK, B JUNE, CH MIESFELDT, S ZHANG, L NABEL, GJ KARPINSKI, B LEIDEN, JM TI CIS-ACTING SEQUENCES REQUIRED FOR INDUCIBLE INTERLEUKIN-2 ENHANCER FUNCTION BIND A NOVEL ETS-RELATED PROTEIN, ELF-1 SO MOLECULAR AND CELLULAR BIOLOGY LA English DT Article ID CELL ANTIGEN RECEPTOR; LYMPHOCYTE-SPECIFIC FACTORS; LONG TERMINAL REPEAT; ALPHA-GENE ENHANCER; 5' FLANKING REGION; HUMAN IL-2 GENE; TRANSCRIPTIONAL ENHANCER; DNA-BINDING; NUCLEAR PROTEINS; T-CELLS AB The recent definition of a consensus DNA binding sequence for the Ets family of transcription factors has allowed the identification of potential Ets binding sites in the promoters and enhancers of many inducible T-cell genes. In the studies described in this report, we have identified two potential Ets binding sites, EBS1 and EBS2, which are conserved in both the human and murine interleukin-2 enhancers. Within the human enhancer, these two sites are located within the previously defined DNase I footprints, NFAT-1 and NFIL-2B, respectively. Electrophoretic mobility shift and methylation interference analyses demonstrated that EBS1 and EBS2 are essential for the formation of the NFAT-1 and NFIL-2B nuclear protein complexes. Furthermore, in vitro mutagenesis experiments demonstrated that inducible interleukin-2 enhancer function requires the presence of either EBS1 or EBS2. Two well-characterized Ets family members, Ets-1 and Ets-2, are reciprocally expressed during T-cell activation. Surprisingly, however, neither of these proteins bound in vitro to EBS1 or EBS2. We therefore screened a T-cell cDNA library under low-stringency conditions with a probe from the DNA binding domain of Ets-1 and isolated a novel Ets family member, Elf-1. Elf-1 contains a DNA binding domain that is nearly identical to that of E74, the ecdysone-inducible Drosophila transcription factor required for metamorphosis (hence the name Elf-1, for E74-like factor 1). Elf-1 bound specifically to both EBS1 and EBS2 in electrophoretic mobility shift assays. It also bound to the purine-rich CD3R element from the human immunodeficiency virus type 2 long terminal repeat, which is required for inducible virus expression in response to signalling through the T-cell receptor. Taken together, these results demonstrate that multiple Ets family members with apparently distinct DNA binding specificities regulate differential gene expression in resting and activated T cells. C1 UNIV MICHIGAN,MED CTR,HOWARD HUGHES MED INST,ANN ARBOR,MI 48109. UNIV MICHIGAN,MED CTR,DEPT INTERNAL MED,ANN ARBOR,MI 48109. UNIV MICHIGAN,MED CTR,DEPT MICROBIOL IMMUNOL,ANN ARBOR,MI 48109. UNIV MICHIGAN,MED CTR,DEPT BIOL CHEM,ANN ARBOR,MI 48109. USN,MED RES INST,BETHESDA,MD 20814. RI Bohjanen, Paul/B-2329-2015 OI Bohjanen, Paul/0000-0002-2772-3597 FU NIAID NIH HHS [AI-29673] NR 59 TC 249 Z9 250 U1 0 U2 1 PU AMER SOC MICROBIOLOGY PI WASHINGTON PA 1325 MASSACHUSETTS AVENUE, NW, WASHINGTON, DC 20005-4171 SN 0270-7306 J9 MOL CELL BIOL JI Mol. Cell. Biol. PD MAR PY 1992 VL 12 IS 3 BP 1043 EP 1053 PG 11 WC Biochemistry & Molecular Biology; Cell Biology SC Biochemistry & Molecular Biology; Cell Biology GA HE838 UT WOS:A1992HE83800015 PM 1545787 ER PT J AU GLADSTONE, KM AF GLADSTONE, KM TI HAZARDOUS MATERIAL AND HAZARDOUS-WASTE MANAGEMENT WITHIN THE NAVY SO NAVAL ENGINEERS JOURNAL LA English DT Article AB This paper discusses alternative strategies to satisfy the requirement for the life-cycle control and management of hazardous material acquired and used by the Navy. It challenges the logistics community to pool scarce and competing resources and forge new bonds of social action to solve common problems related to a more efficient and cost effective management of this now very important and burgeoning program. RP GLADSTONE, KM (reprint author), USN,SEA SYST COMMAND,FLEET LOGIST SUPPORT DIRECTORATE,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 1992 VL 104 IS 2 BP 33 EP 38 PG 6 WC Engineering, Marine; Engineering, Civil; Oceanography SC Engineering; Oceanography GA HK910 UT WOS:A1992HK91000003 ER PT J AU BARON, NT CEBULSKI, DR AF BARON, NT CEBULSKI, DR TI EMI - THE ENEMY WITHIN SO NAVAL ENGINEERS JOURNAL LA English DT Article AB Electromagnetic interference (EMI) is one of the major contributors to mission degradation in our fleet today due to the increase in population and sensitivity of both topside and below deck electronic systems. Sensitive combat systems designed to counter intelligent and deceptive targets can be confused by the complex intra-ship EM environment. This can cause identification failure or losing "track" of a hostile or incoming missile or even engaging "friendly targets." Topside design and integration efforts have been used to reduce EMI, but this is not the total solution to the problem. A program of total ship and system EMI assessment and control must be implemented. This program must exploit electromagnetic compatibility (EMC) optimization in electronic circuit design and take advantage of and (in some cases) direct topside shapes and structures to control the propagation of desired and undesired EM energy. Positive and active control of EM design characteristics are absolutely required before optimum combat system effectiveness can be realized. This paper will describe the current topside design process, EMC improvements being made, and how the process is being integrated into, and is dependent upon, the ship design process. It will give examples of some of the major mission degrading EMI problems in the fleet today and how past problems were solved with existing EM analysis programs. It will also discuss the control of EM energy in new design through the use of techniques being developed such as ray tracing and ray casting. The paper projects where the challenges lie for future topside and EM engineering designers and describes how the equipment technology transfer process must be better integrated to meet the challenge of effective EMI control. RP BARON, NT (reprint author), USN,SEA SYST COMMAND WEAPONS & COMBAT SYST DIRECTORATE,WASHINGTON,DC 20350, USA. NR 0 TC 1 Z9 1 U1 0 U2 0 PU AMER SOC NAVAL ENG INC PI ALEXANDRIA PA 1452 DUKE STREET, ALEXANDRIA, VA 22314-3458 SN 0028-1425 J9 NAV ENG J JI Nav. Eng. J. PD MAR PY 1992 VL 104 IS 2 BP 69 EP 80 PG 12 WC Engineering, Marine; Engineering, Civil; Oceanography SC Engineering; Oceanography GA HK910 UT WOS:A1992HK91000006 ER PT J AU BLATSTEIN, IM AF BLATSTEIN, IM TI RESEARCH-AND-DEVELOPMENT - BREAKFAST OF CHAMPIONS SO NAVAL ENGINEERS JOURNAL LA English DT Editorial Material RP BLATSTEIN, IM (reprint author), USN,CTR SURFACE WARFARE,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 1992 VL 104 IS 2 BP 81 EP 83 PG 3 WC Engineering, Marine; Engineering, Civil; Oceanography SC Engineering; Oceanography GA HK910 UT WOS:A1992HK91000007 ER PT J AU MALLEY, KC AF MALLEY, KC TI AFFORDABILITY IN A CHANGING WORLD SO NAVAL ENGINEERS JOURNAL LA English DT Article RP MALLEY, KC (reprint author), USN,SEA SYST COMMAND,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 1992 VL 104 IS 2 BP 84 EP 86 PG 3 WC Engineering, Marine; Engineering, Civil; Oceanography SC Engineering; Oceanography GA HK910 UT WOS:A1992HK91000008 ER PT J AU VOHRA, ST BUCHOLTZ, F AF VOHRA, ST BUCHOLTZ, F TI FIBEROPTIC AC ELECTRIC-FIELD SENSOR BASED ON THE ELECTROSTRICTIVE EFFECT SO OPTICS LETTERS LA English DT Article AB We report a fiber-optic ac electric-field sensor based on the electrostrictive effect. The dc-biased electrostrictive transducer-lead magnesium niobate-based ferroelectric relaxor-displays an electric-field resolution of 7 (mu-V/m)/square-root Hz with a corresponding voltage resolution of 1 nV/square-root Hz for 15 cm of fiber. Such high resolution is possible in nonlinear transducers owing to the dependence of the ac strain on applied dc bias. Conversely, the ac strain in linear piezoelectric transducers does not vary with the dc field, and the ultimate resolution obtained with such devices is dependent only on the piezoelectric constant and the total fiber length. RP VOHRA, ST (reprint author), USN,RES LAB,DIV OPT SCI,CODE 6570,WASHINGTON,DC 20375, USA. NR 7 TC 7 Z9 7 U1 0 U2 1 PU OPTICAL SOC AMER PI WASHINGTON PA 2010 MASSACHUSETTS AVE NW, WASHINGTON, DC 20036 SN 0146-9592 J9 OPT LETT JI Opt. Lett. PD MAR 1 PY 1992 VL 17 IS 5 BP 372 EP 374 DI 10.1364/OL.17.000372 PG 3 WC Optics SC Optics GA HF128 UT WOS:A1992HF12800022 PM 19784332 ER PT J AU LEEK, MR HANNA, TE MARSHALL, L AF LEEK, MR HANNA, TE MARSHALL, L TI ESTIMATION OF PSYCHOMETRIC FUNCTIONS FROM ADAPTIVE TRACKING PROCEDURES SO PERCEPTION & PSYCHOPHYSICS LA English DT Article ID STATISTICAL PROPERTIES; PSYCHOPHYSICAL PROCEDURES; PSYCHOACOUSTICS; THRESHOLD AB Because adaptive tracking procedures are designed to avoid stimulus levels far from a target threshold value, the psychometric function constructed from the trial-by-trial data in the track may be accurate near the target level but a poor reflection of performance at levels far removed from the target. A series of computer simulations was undertaken to assess the reliability and accuracy of psychometric functions generated from data collected in up-down adaptive tracking procedures. Estimates of psychometric function slopes were obtained from trial-by-trial data in simulated adaptive tracks and compared with the true characteristics of the functions used to generate the tracks. Simulations were carried out for three psychophysical procedures and two target performance levels, with tracks generated by psychometric functions with three different slopes. The functions reconstructed from the tracking data were, for the most part, accurate reflections of the true generating functions when at least 200 trials were included in the tracks. However, for 50- and 100-trial tracks, slope estimates were biased high for all simulated experimental conditions. Correction factors for slope estimates from these tracks are presented. There was no difference in the accuracy and reliability of slope estimation due to target level for the adaptive track, and only minor differences due to psychophysical procedure. It is recommended that, if both threshold and slope of psychometric functions are to be estimated from the trial-by-trial tracking data, at least 100 trials should be included in the tracks, and a three- or four-alternative forced-choice procedure should be used. However, good estimates can also be obtained using the two-alternative forced-choice procedure or less than 100 trials if appropriate corrections for bias are applied. C1 USN,SUBMARINE MED RES LAB,SUBMARINE BASE NEW LONDON,GROTON,CT 06340. RP LEEK, MR (reprint author), WALTER REED ARMY MED CTR,CTR AUDIOL & SPEECH,WASHINGTON,DC 20307, USA. NR 20 TC 53 Z9 53 U1 0 U2 2 PU PSYCHONOMIC SOC INC PI AUSTIN PA 1710 FORTVIEW RD, AUSTIN, TX 78704 SN 0031-5117 J9 PERCEPT PSYCHOPHYS JI Percept. Psychophys. PD MAR PY 1992 VL 51 IS 3 BP 247 EP 256 DI 10.3758/BF03212251 PG 10 WC Psychology; Psychology, Experimental SC Psychology GA HH655 UT WOS:A1992HH65500005 PM 1561050 ER PT J AU GORDON, G AF GORDON, G TI CROSS-CULTURAL TRAINING ISNT A PANACEA SO PERSONNEL JOURNAL LA English DT Letter C1 USN,PERSONAL RES & DEV CTR,SAN DIEGO,CA 92152. RP GORDON, G (reprint author), SAN DIEGO STATE UNIV,SAN DIEGO,CA 92182, USA. NR 2 TC 0 Z9 0 U1 0 U2 0 PU ACC COMMUNICATIONS INC PI COSTA MESA PA 245 FISCHER AVE, COSTA MESA, CA 92626 SN 0031-5745 J9 PERS J JI Pers. J. PD MAR PY 1992 VL 71 IS 3 BP 12 EP 12 PG 1 WC Psychology, Applied SC Psychology GA HF804 UT WOS:A1992HF80400002 ER PT J AU IDO, H SUGIYAMA, K HACHINO, H DATE, M CHENG, SF MAKI, K AF IDO, H SUGIYAMA, K HACHINO, H DATE, M CHENG, SF MAKI, K TI MAGNETIC STUDY OF SMN+1CO3N+5B2N (N = 0, 1, 2, 3) IN A PULSED HIGH-FIELD SO PHYSICA B LA English DT Article; Proceedings Paper CT 3RD INTERNATIONAL SYMP ON RESEARCH ON HIGH MAGNETIC FIELDS A SATELLITE OF THE 3RD INTERNATIONAL CONF ON MAGNETISM ( ICM 91 ) CY AUG 29-31, 1991 CL UNIV AMSTERDAM, AMSTERDAM, NETHERLANDS SP KONINKLIJKE NEDERLANDSE AKAD WETENSCHAPPEN, STICHTING FUNDAMENTEEL ONDERZOEK MAT, STICHTING PHYS, UNIV AMSTERDAM, KATHOLIEKE UNIV NIJMEGEN, HOEK LOOS IND GASSES, OXFORD INSTRUMENTS, ELSEVIER SCI PUBL, OCE COPIERS, IBM NEDERLAND HO UNIV AMSTERDAM ID BORIDE AB Hard magnetic materials, Smn+1Co3n+5B2n (n = 0,...,4) have been investigated in high magnetic fields up to 36 T at the Research Center for Extreme Materials, Osaka University. Anisotropy fields of SmCo5 (n = 0), SmCo4B (n = 1). Sm3Co11B4 (n = 2) and Sm2Co7B3 (n = 3) are found to be 710, 1200, 1160 and 1300 kOe at T = 4.2 K, respectively. These data are discussed together with the magnetic measurements of these compounds. C1 NSWC,SILVER SPRING,MD 20903. OSAKA UNIV,DEPT PHYS,TOYONAKA,OSAKA 560,JAPAN. SUMITOMO MET MIN CO LTD,CENT RES INST,ICHIKAWA 272,JAPAN. RP IDO, H (reprint author), TOHOKU GAKUIN UNIV,DEPT APPL PHYS,TAGAJO 985,JAPAN. NR 10 TC 33 Z9 35 U1 4 U2 4 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0921-4526 J9 PHYSICA B JI Physica B PD MAR PY 1992 VL 177 IS 1-4 BP 265 EP 269 DI 10.1016/0921-4526(92)90110-E PG 5 WC Physics, Condensed Matter SC Physics GA HP250 UT WOS:A1992HP25000057 ER PT J AU DAVIS, JP DRESSLER, E AF DAVIS, JP DRESSLER, E TI SUPPRESSED EXCITATION DUE TO THE DYNAMIC STARK-EFFECT THAT ARISES FROM AMPLIFIED SPONTANEOUS EMISSION SO PHYSICAL REVIEW A LA English DT Article AB We have numerically solved a simplified set of Maxwell-Bloch equations for a two-field, three-level model. Excitation from the ground state to the upper state is a two-photon process with a nonresonant intermediate state. Amplified spontaneous emission can occur from the upper excited state of the model system to the intermediate state. The equations can contain terms corresponding to the dynamic Stark effect resulting from the amplified spontaneous-emission field. Inclusion of these terms significantly reduces the excitation probability when the irradiance of the exciting field is above the threshold for occurrence of amplified spontaneous emission from the upper excited state. These theoretical results qualitatively explain a recent experimental observation of the decreased probability for such a process in gas-phase xenon. C1 PENN STATE UNIV,DEPT PHYS,ABINGTON,PA 19001. RP DAVIS, JP (reprint author), USN,CTR AIR DEV,CODE 5012,WARMINSTER,PA 18974, USA. NR 17 TC 4 Z9 4 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1050-2947 J9 PHYS REV A JI Phys. Rev. A PD MAR 1 PY 1992 VL 45 IS 5 BP 3104 EP 3112 DI 10.1103/PhysRevA.45.3104 PG 9 WC Optics; Physics, Atomic, Molecular & Chemical SC Optics; Physics GA HH617 UT WOS:A1992HH61700059 ER PT J AU OSOFSKY, MS COHN, JL SKELTON, EF MILLER, MM SOULEN, RJ WOLF, SA VANDERAH, TA AF OSOFSKY, MS COHN, JL SKELTON, EF MILLER, MM SOULEN, RJ WOLF, SA VANDERAH, TA TI PERCOLATION EFFECTS AND OXYGEN INHOMOGENEITIES IN YBA2CU3O7-DELTA CRYSTALS SO PHYSICAL REVIEW B LA English DT Article ID CRITICAL CURRENTS; SINGLE-CRYSTALS; CU-O; MAGNETIZATION; SUPERCONDUCTIVITY; BOUNDARIES; MODEL; 60-K AB The magnetization curves of YBa2Cu3O7-delta crystals are widely observed to exhibit a pronounced low-field minimum in the temperature range 30 K < T < T(c). We demonstrate that these magnetization anomalies correlate with the c-axis lattice parameter, and hence with the specific oxygen deficiency delta. We interpret this low-field feature in terms of a field-induced decoupling of regions of oxygen-rich material by boundaries of oxygen-poor material, a phenomenon reminiscent of the behavior in granular superconductors. A "phase diagram" that demarcates the multigrain onset as a function of temperature and delta is then constructed. The shape of the "phase boundaries" is described using a percolation model. This analysis demonstrates that magnetization is a very sensitive measure of crystal quality. C1 USN, CTR WEAP, CHINA LAKE, CA 93555 USA. RP OSOFSKY, MS (reprint author), USN, RES LAB, WASHINGTON, DC 20375 USA. RI Wolf, Stuart/A-7513-2009; Osofsky, Michael/A-1050-2010 NR 24 TC 91 Z9 91 U1 0 U2 4 PU AMER PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1098-0121 EI 1550-235X J9 PHYS REV B JI Phys. Rev. B PD MAR 1 PY 1992 VL 45 IS 9 BP 4916 EP 4922 DI 10.1103/PhysRevB.45.4916 PG 7 WC Physics, Condensed Matter SC Physics GA HH418 UT WOS:A1992HH41800048 ER PT J AU WEN, X GARLAND, CW SHASHIDHAR, R BAROIS, P AF WEN, X GARLAND, CW SHASHIDHAR, R BAROIS, P TI CALORIMETRIC STUDY OF THE SMECTIC-AD-SMECTIC-A2 CRITICAL-POINT IN A BINARY MIXTURE OF HOMOLOGS SO PHYSICAL REVIEW B LA English DT Article ID A TRICRITICAL BEHAVIOR; LIQUID-CRYSTALS; TRANSITIONS AB High-resolution calorimetry measurements have been performed in the vicinity of the smectic-A(d)-smectic-A2 (SmA(d)-SmA2) critical point in mixtures of 10OPCBOB and 11OPCBOB, where nOPCBOB is alkyloxyphenyl-cyanobenzyloxy benzoate. The variation of the heat capacity C(p) for three near-critical mixtures with 11OPCBOB mole % X = 40.7, 42.2, and 43.5 is well described by a simple power law over a temperature range as large as T(c) +/- 10 K. The critical exponent gamma/DELTA has the value 0.45 +/- 0.08, which agrees with neither the mean-field nor the three-dimensional Ising model. This experimental exponent value supports the theoretical prediction that the SmA(d)-SmA2 critical point belongs to a new universality class different from that of Ising systems. A significant distortion of the C(p)(T) peak very close to its maximum was observed for all three samples. This is an intrinsic effect that is not presently well understood; it may represent a crossover behavior for samples with a concentration X slightly different from the critical value X(c). C1 MIT,CTR MAT SCI & ENGN,CAMBRIDGE,MA 02139. USN,RES LAB,CTR BIOMOLEC SCI & ENGN,WASHINGTON,DC 20375. CTR RECH PAUL PASCAL,F-33600 PESSAC,FRANCE. RP WEN, X (reprint author), MIT,DEPT CHEM,CAMBRIDGE,MA 02139, USA. NR 19 TC 10 Z9 10 U1 0 U2 1 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD MAR 1 PY 1992 VL 45 IS 10 BP 5131 EP 5139 DI 10.1103/PhysRevB.45.5131 PG 9 WC Physics, Condensed Matter SC Physics GA HJ689 UT WOS:A1992HJ68900001 ER PT J AU QADRI, SB SKELTON, EF WEBB, AW MOULTON, N HU, JZ FURDYNA, JK AF QADRI, SB SKELTON, EF WEBB, AW MOULTON, N HU, JZ FURDYNA, JK TI PRESSURE-INDUCED PHASE-TRANSITION OF ZN0.83FE0.17SE SO PHYSICAL REVIEW B LA English DT Note ID MAGNETIC SEMICONDUCTOR ZN1-XFEXSE; CALIBRATION; ABSORPTION; DEPENDENCE AB Energy-dispersive x-ray-diffraction measurements have been performed at room temperature under hydrostatic pressure to 25.0 GPa to study the structure phase transition in Zn0.87Fe0.17Se. The transition from the zinc-blende to the sodium chloride phase is determined to be 10.4 +/- 0.6 GPa. RP QADRI, SB (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 22 TC 14 Z9 14 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD MAR 1 PY 1992 VL 45 IS 10 BP 5670 EP 5671 DI 10.1103/PhysRevB.45.5670 PG 2 WC Physics, Condensed Matter SC Physics GA HJ689 UT WOS:A1992HJ68900062 ER PT J AU UHM, HS AF UHM, HS TI A KINETIC-THEORY OF THE EXTRAORDINARY-MODE PERTURBATIONS IN CYLINDRICAL RELATIVISTIC MAGNETRONS SO PHYSICS OF FLUIDS B-PLASMA PHYSICS LA English DT Article ID NEUTRAL ELECTRON FLOW; STABILITY PROPERTIES; PLANAR DIODE; GEOMETRY; FIELD AB Stability properties of the extraordinary-mode perturbations in a relativistic electron flow generated inside a cylindrical magnetron are investigated within the framework of the linearized Vlasov-Maxwell equations. The stability analysis is carried out under the assumptions that the layer is thin and relatively tenuous, and that the phase velocity of the perturbed waves is very close to the mean drift velocity of the layer. The perturbed distribution function of the extraordinary-mode perturbations is calculated by integrating along the electron orbit. The eigenvalue equation is derived and solved separately in the vacuum and layer regions by properly matching boundary conditions at the inter-regional surface. Solution in the vacuum region includes the resonator and cylindrical curvature effects. A closed algebraic dispersion relation is obtained for the synchronous modes, whose phase velocity is very close to the mean drift velocity of the layer. Analytical investigation of the dispersion relation is carried out for the resonance modes, whose eigenfrequency is very close to the vacuum modes in the magnetron circuit. The necessary and sufficient condition for instability is obtained for the resonance modes. It is shown that typical growth rates of the instability are a few percent of the electron cyclotron frequency. RP UHM, HS (reprint author), USN,CTR SURFACE WARFARE,10903 NEW HAMPSHIRE AVE,SILVER SPRING,MD 20903, USA. NR 10 TC 10 Z9 10 U1 0 U2 1 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0899-8221 J9 PHYS FLUIDS B-PLASMA PD MAR PY 1992 VL 4 IS 3 BP 740 EP 749 DI 10.1063/1.860217 PG 10 WC Physics, Fluids & Plasmas SC Physics GA HF908 UT WOS:A1992HF90800029 ER PT J AU DONNELLAN, TM ROYLANCE, D AF DONNELLAN, TM ROYLANCE, D TI RELATIONSHIPS IN A BISMALEIMIDE RESIN SYSTEM .1. CURE MECHANISMS SO POLYMER ENGINEERING AND SCIENCE LA English DT Article ID EPOXY-RESIN; PHYSICAL-PROPERTIES; AROMATIC DIAMINES; CROSSLINKING AB A series of bismaleimide resin systems has been examined in order to identify the molecular features responsible for the mechanical response of these materials. A range of network structures was produced both by formulation of resins with different ratios of N,N'-bismaleimido-4,4'-diphenylmethane (BMI) and methylene dianiline (MDA), and by the use of different thermal processing cycles. Spectrographic and chromatographic techniques were used to study the reactions that occurred during the cure. Two principal reactions were confirmed: a Michael addition reaction which provides linear chain growth, and an addition reaction which produces crosslinking through the double bonds of the maleimide group. In general, curing at a lower temperature or increasing the MDA content served to favor chain extension over crosslinking, which might be expected to increase molecular mobility in the resin. C1 MIT,CAMBRIDGE,MA 02139. RP DONNELLAN, TM (reprint author), USN,CTR AIR DEV,WARMINSTER,PA 18974, USA. NR 23 TC 22 Z9 22 U1 0 U2 4 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 1992 VL 32 IS 6 BP 409 EP 414 DI 10.1002/pen.760320604 PG 6 WC Engineering, Chemical; Polymer Science SC Engineering; Polymer Science GA HK939 UT WOS:A1992HK93900003 ER PT J AU DONNELLAN, TM ROYLANCE, D AF DONNELLAN, TM ROYLANCE, D TI RELATIONSHIPS IN A BISMALEIMIDE RESIN SYSTEM .2. THERMOMECHANICAL PROPERTIES SO POLYMER ENGINEERING AND SCIENCE LA English DT Article ID EPOXY-RESIN; PHYSICAL-PROPERTIES; FRACTURE-TOUGHNESS; FAILURE PROCESSES; CROSSLINKING; DEFORMATION AB A range of bismaleimide resins of differing network structure was produced both by varying the ratios of N,N'-bismaleimido-4,4'-diphenylmethane (BMI) and methylene dianiline (MDA), and also by the use of different thermal processing cycles. Characterization of the resins by a variety of mechanical, physical, and micrographic techniques showed that properties such as modulus and yield strength varied directly with crosslink density and its associated free volume. Fracture toughness was found to increase as the crosslink density decreased, and microscopic investigation of the resin fracture surfaces identified characteristics which correlated with the resin fracture toughness. C1 MIT,CAMBRIDGE,MA 02139. RP DONNELLAN, TM (reprint author), USN,CTR AIR DEV,WARMINSTER,PA 18974, USA. NR 12 TC 12 Z9 12 U1 0 U2 0 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 1992 VL 32 IS 6 BP 415 EP 420 DI 10.1002/pen.760320605 PG 6 WC Engineering, Chemical; Polymer Science SC Engineering; Polymer Science GA HK939 UT WOS:A1992HK93900004 ER PT J AU CUSACK, JR MALANEY, KR AF CUSACK, JR MALANEY, KR TI PATIENTS WITH ANTISOCIAL PERSONALITY-DISORDER - ARE THEY BAD OR MAD SO POSTGRADUATE MEDICINE LA English DT Article ID SUBSTANCE ABUSE AB Selfish, manipulative, irresponsible, and deceptive persons may have antisocial personality disorder. What causes this disorder, and how can primary care physicians best deal with patients who have it? Is psychotherapy likely to be of benefit? The authors address these and other questions, providing a detailed clinical picture of the condition. C1 USN HOSP,DEPT PSYCHIAT,CHARLESTON,SC. HCA TRIDENT REG MED CTR,CHARLESTON,SC. NR 8 TC 1 Z9 1 U1 0 U2 3 PU MCGRAW HILL HEALTHCARE PUBLICATIONS PI MINNEAPOLIS PA 4530 WEST 77TH ST, MINNEAPOLIS, MN 55435-5000 SN 0032-5481 J9 POSTGRAD MED JI Postgrad. Med. PD MAR PY 1992 VL 91 IS 4 BP 341 EP & PG 0 WC Medicine, General & Internal SC General & Internal Medicine GA HK951 UT WOS:A1992HK95100031 PM 1546022 ER PT J AU RAJAGOPAL, AK AF RAJAGOPAL, AK TI BIVARIATE AVERAGING FUNCTIONS, TRANSLATION AND SCALE AUTOCORRELATIONS, FOURIER AND MELLIN TRANSFORMS, THE WIENER-KHINCHINE THEOREM AND THEIR INTERRELATIONSHIPS SO PRAMANA-JOURNAL OF PHYSICS LA English DT Article DE BIVARIATE AVERAGING FUNCTION; UNCERTAINTY PRINCIPLE; FOURIER AND MELLIN TRANSFORMS; AUTOCORRELATIONS; THE WIENER-KHINCHINE THEOREM AB We first draw attention to the fact that the position operator, X, its translation generator, P, and its scale generator, D, form an important group of triplet of operators that appear in the Heisenberg uncertainty relation stated in its most general form. The pair (X,P) forms the phase-space and they have led to Fourier transform pair, the autocorrelation function, the Wiener-Khinchine theorem, and the Wigner function with many different applications to wave phenomena. The importance of the pairs (X,D) and (P,D) has been pointed out by Moses and Quesada (1972, 1973, 1974) who showed that we must then consider a Mellin transform pair, a scale autocorrelation function, and a corresponding Wiener-Khinchine theorem. In the present paper, we define and explore properties of a bivariate averaging function defined in a new "phase-space" involving the Mellin transform variable and its partner which can either be the position or momentum, analogous to the Wigner function. The not-necessaryily positive feature of the bivariate averaging functions is traced to the general Heisenberg uncertainty mentioned above. The properties and their inter-relationships among the averaging functions are given. We hope this will be of use in discussing physical phenomena involving fractals, turbulence, and near phase transitions where the scaling properties are of importance. C1 USN,RES LAB,WASHINGTON,DC 20375. RP RAJAGOPAL, AK (reprint author), INDIAN INST SCI,JAWAHARLAL NEHRU CTR ADV SCI RES,BANGALORE 560012,KARNATAKA,INDIA. NR 13 TC 1 Z9 1 U1 0 U2 1 PU INDIAN ACADEMY SCIENCES PI BANGALORE PA P B 8005 C V RAMAN AVENUE, BANGALORE 560 080, INDIA SN 0304-4289 J9 PRAMANA-J PHYS JI Pramana-J. Phys. PD MAR PY 1992 VL 38 IS 3 BP 233 EP 247 DI 10.1007/BF02875370 PG 15 WC Physics, Multidisciplinary SC Physics GA HK186 UT WOS:A1992HK18600002 ER PT J AU LOCKHART, JM AF LOCKHART, JM TI THE CONJUGACY PROBLEM FOR GRAPH PRODUCTS WITH INFINITE CYCLIC EDGE GROUPS SO PROCEEDINGS OF THE AMERICAN MATHEMATICAL SOCIETY LA English DT Article ID SUBGROUPS AB Finite graph products of groups with solvable conjugacy problem and infinite cyclic edge groups are considered. It is shown that the graph product has solvable conjugacy problem if the images of the edge group generators in each vertex group (G)upsilon are powers of a common central element c, where the group generated by c has solvable generalized word problem in (G)upsilon. RP LOCKHART, JM (reprint author), USN ACAD,ANNAPOLIS,MD 21402, USA. NR 7 TC 0 Z9 0 U1 0 U2 0 PU AMER MATHEMATICAL SOC PI PROVIDENCE PA 201 CHARLES ST, PROVIDENCE, RI 02940-2213 SN 0002-9939 J9 P AM MATH SOC JI Proc. Amer. Math. Soc. PD MAR PY 1992 VL 114 IS 3 BP 603 EP 606 PG 4 WC Mathematics, Applied; Mathematics SC Mathematics GA HH836 UT WOS:A1992HH83600004 ER PT J AU PAPPERT, RA PAULUS, RA TAPPERT, FD AF PAPPERT, RA PAULUS, RA TAPPERT, FD TI SEA ECHO IN TROPOSPHERIC DUCTING ENVIRONMENTS SO RADIO SCIENCE LA English DT Article ID GRAZING ANGLES; CLUTTER; SURFACE; PROPAGATION; SCATTERING; WAVES AB Path loss formulas for sea surface backscatter are developed for horizontally stratified tropospheric ducting environments. First-order Bragg backscatter results coupled with ray and waveguide formalism serve as the basis for the development. Two features of composite model formalism, namely shadowing and tilting of the surface normal in the plane of incidence, are included in the development. Though developed for hh polarization, conventional composite model modifications for vertical polarization and depolarization can be incorporated into the echo models. Comparisons are made with previously generated parabolic equation results and with empirical model results generated by Engineers Refractive Effects Prediction System. These comparisons are for a frequency of 9.6 GHz for the standard atmosphere and for 14- and 28-m evaporation ducts. Results apply to wind speeds of 10, 20, 30, and 40 knots (almost-equal-to 5, 10, 15, and 20 m/s). C1 UNIV MIAMI,DEPT APPL MARINE PHYS,MIAMI,FL 33152. RP PAPPERT, RA (reprint author), USN,CTR OCEAN SYST,DIV OCEAN & ATMOSPHER SCI,SAN DIEGO,CA 92152, USA. NR 36 TC 6 Z9 7 U1 0 U2 0 PU AMER GEOPHYSICAL UNION PI WASHINGTON PA 2000 FLORIDA AVE NW, WASHINGTON, DC 20009 SN 0048-6604 J9 RADIO SCI JI Radio Sci. PD MAR-APR PY 1992 VL 27 IS 2 BP 189 EP 209 DI 10.1029/91RS02962 PG 21 WC Astronomy & Astrophysics; Geochemistry & Geophysics; Meteorology & Atmospheric Sciences; Remote Sensing; Telecommunications SC Astronomy & Astrophysics; Geochemistry & Geophysics; Meteorology & Atmospheric Sciences; Remote Sensing; Telecommunications GA HM401 UT WOS:A1992HM40100009 ER PT J AU FERGUSON, JA HANSEN, PM AF FERGUSON, JA HANSEN, PM TI APPLICATION OF WAVE GUIDE PROPAGATION TO SELECTION OF TRANSMITTER POWER AND FREQUENCY SO RADIO SCIENCE LA English DT Article AB This paper is concerned with developing reasonable criteria for the selection of frequency and power for very low and low-frequency (VLF/LF) transmitting stations. The approach uses a wave guide model for low-frequency propagation and accounts for the variability of the ionosphere. A sample problem involving a hypothetical transmitter is described. RP FERGUSON, JA (reprint author), USN,CTR OCEAN SYST,CODE 542,SAN DIEGO,CA 92152, USA. NR 10 TC 0 Z9 0 U1 0 U2 0 PU AMER GEOPHYSICAL UNION PI WASHINGTON PA 2000 FLORIDA AVE NW, WASHINGTON, DC 20009 SN 0048-6604 J9 RADIO SCI JI Radio Sci. PD MAR-APR PY 1992 VL 27 IS 2 BP 211 EP 220 DI 10.1029/92RS00006 PG 10 WC Astronomy & Astrophysics; Geochemistry & Geophysics; Meteorology & Atmospheric Sciences; Remote Sensing; Telecommunications SC Astronomy & Astrophysics; Geochemistry & Geophysics; Meteorology & Atmospheric Sciences; Remote Sensing; Telecommunications GA HM401 UT WOS:A1992HM40100010 ER PT J AU SETHIAN, JD CORCORAN, PA AF SETHIAN, JD CORCORAN, PA TI USE OF TIME DOMAIN REFLECTOMETER MEASUREMENTS ON A SCALE-MODEL TO PREDICT THE EFFECTS OF A 90-DEGREES BEND IN A LARGE COAXIAL PULSE FORMING LINE SO REVIEW OF SCIENTIFIC INSTRUMENTS LA English DT Article AB We have devised a simple experimental technique for determining the effects of a 90-degrees bend in a coaxial pulse forming line. A time domain reflectometer (TDR) is used to inject a fast rising signal (< 25 ps) into a scale model of the proposed line. These measurements could easily establish the effects of the bend and agreed well with the predictions of a 3-D code. While this TDR technique was applied to a coaxial system, it can be valid for many types of pulsed components and networks. In some cases it may be simpler to use than a complicated 3-D code. C1 PULSE SCI INC,SAN LEANDRO,CA 94577. RP SETHIAN, JD (reprint author), USN,RES LAB,DIV PLASMA PHYS,WASHINGTON,DC 20375, USA. NR 4 TC 2 Z9 2 U1 0 U2 1 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0034-6748 J9 REV SCI INSTRUM JI Rev. Sci. Instrum. PD MAR PY 1992 VL 63 IS 3 BP 2014 EP 2016 DI 10.1063/1.1143157 PG 3 WC Instruments & Instrumentation; Physics, Applied SC Instruments & Instrumentation; Physics GA HG449 UT WOS:A1992HG44900027 ER PT J AU WOODY, DL AF WOODY, DL TI EXPERIMENTAL PROCEDURES FOR THE OBSERVANCE OF SHEAR BAND FORMATION DURING LOW VELOCITY IMPACTS SO REVIEW OF SCIENTIFIC INSTRUMENTS LA English DT Article ID SHOCK AB This paper describes in detail the experimental procedures and apparatus involved in experiments that observe the real-time formation of shear bands in NaCl crystals during deformation due to impact. The crystals, impacted at low velocities of 5-20 m/s, emit rapid (30 ns) infrared emissions. An array of fast responding infrared detectors formed images which indicated that the shear bands form within a few tens of nanoseconds. RP WOODY, DL (reprint author), NAVAL SURFACE WARFARE CTR,WHITE OAK,MD 20903, USA. NR 16 TC 1 Z9 1 U1 0 U2 3 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0034-6748 J9 REV SCI INSTRUM JI Rev. Sci. Instrum. PD MAR PY 1992 VL 63 IS 3 BP 2030 EP 2034 DI 10.1063/1.1143161 PG 5 WC Instruments & Instrumentation; Physics, Applied SC Instruments & Instrumentation; Physics GA HG449 UT WOS:A1992HG44900031 ER PT J AU CERIO, FM WEIMER, WA AF CERIO, FM WEIMER, WA TI CONSTRUCTION OF AN INEXPENSIVE DC PLASMA-JET FOR DIAMOND DEPOSITION USING COMMERCIALLY AVAILABLE COMPONENTS SO REVIEW OF SCIENTIFIC INSTRUMENTS LA English DT Article ID CHEMICAL VAPOR-DEPOSITION; DISCHARGE PLASMA; FILM; GROWTH AB A de plasma jet reactor system, constructed from commercially available components, is described. Parameters for the chemical vapor deposition of high quality diamond are given. Diamond films were synthesized on Mo, Si, Cu, and stainless-steel substrates and characterized by optical microscopy and Raman spectroscopy. C1 USN,NAVAL WEAPONS CTR,DIV CHEM,RES DEPT,CHINA LAKE,CA 93555. NR 15 TC 14 Z9 14 U1 0 U2 0 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0034-6748 J9 REV SCI INSTRUM JI Rev. Sci. Instrum. PD MAR PY 1992 VL 63 IS 3 BP 2065 EP 2068 DI 10.1063/1.1143167 PG 4 WC Instruments & Instrumentation; Physics, Applied SC Instruments & Instrumentation; Physics GA HG449 UT WOS:A1992HG44900039 ER PT J AU FRENZEN, CL AF FRENZEN, CL TI ERROR-BOUNDS FOR THE ASYMPTOTIC-EXPANSION OF THE RATIO OF 2 GAMMA FUNCTIONS WITH COMPLEX ARGUMENT SO SIAM JOURNAL ON MATHEMATICAL ANALYSIS LA English DT Article DE ERROR BOUND; ASYMPTOTIC EXPANSION; GAMMA FUNCTION AB Error bounds are obtained for an asymptotic expansion of the ratio of two gamma functions GAMMA(z + a)/GAMMA(z + b) when a and b are complex constants and \z\ is large. These bounds reduce to earlier bounds for the real case when a, b, and z are real. Properties of completely monotonic functions are used to provide error bounds in the complex case, as in the earlier real case. RP FRENZEN, CL (reprint author), NAVAL POST GRAD SCH,DEPT MATH,MONTEREY,CA 93943, USA. NR 7 TC 3 Z9 3 U1 0 U2 2 PU SIAM PUBLICATIONS PI PHILADELPHIA PA 3600 UNIV CITY SCIENCE CENTER, PHILADELPHIA, PA 19104-2688 SN 0036-1410 J9 SIAM J MATH ANAL JI SIAM J. Math. Anal. PD MAR PY 1992 VL 23 IS 2 BP 505 EP 511 DI 10.1137/0523024 PG 7 WC Mathematics, Applied SC Mathematics GA HE399 UT WOS:A1992HE39900010 ER PT J AU MCMAHON, JR FRANKE, R AF MCMAHON, JR FRANKE, R TI KNOT SELECTION FOR LEAST-SQUARES THIN PLATE SPLINES SO SIAM JOURNAL ON SCIENTIFIC AND STATISTICAL COMPUTING LA English DT Article DE KNOT SELECTION; LEAST SQUARES; THIN PLATE SPLINES; DIRICHLET TESSELLATION; SCATTERED DATA ID SCATTERED DATA; APPROXIMATION; INTERPOLATION AB An algorithm for the selection of knot point locations for approximation of functions from large sets of scattered data by least squares thin plate splines is given. The algorithm is based on the idea that each data point is equally important in defining the surface, which allows the knot selection process to be decoupled from the least squares. Properties of the algorithm are investigated, and examples demonstrating it are given. Results of some least squares approximations are given and compared with other approximation methods. C1 USN,POSTGRAD SCH,MONTEREY,CA 93943. RP MCMAHON, JR (reprint author), US MIL ACAD,DEPT MATH,W POINT,NY 10996, USA. NR 14 TC 10 Z9 12 U1 0 U2 0 PU SIAM PUBLICATIONS PI PHILADELPHIA PA 3600 UNIV CITY SCIENCE CENTER, PHILADELPHIA, PA 19104-2688 SN 0196-5204 J9 SIAM J SCI STAT COMP PD MAR PY 1992 VL 13 IS 2 BP 484 EP 498 DI 10.1137/0913026 PG 15 WC Mathematics, Applied SC Mathematics GA HE400 UT WOS:A1992HE40000003 ER PT J AU ERWIN, SC PICKETT, WE AF ERWIN, SC PICKETT, WE TI VANISHING SCHOTTKY BARRIERS IN DIAMOND METAL INTERFACES SO SOLID STATE COMMUNICATIONS LA English DT Article ID ELECTRONIC-STRUCTURE; HETEROJUNCTIONS AB We present theoretical evidence that Schottky-barrier heights may, for certain types of interfaces, be far more sensitive to interface geometry than previously suspected. We have identified two classes of diamond/metal interface orientations, one of which leads to Schottky-barrier heights of order 1 eV, the other to barrier heights that are very small or zero. This striking difference can be traced to details of the gap-state band structure that arise from different bonding mechanisms, for which the precise atomic geometry plays a crucial role. C1 USN,RES LAB,COMPLEX SYST THEORY BRANCH,WASHINGTON,DC 20375. RP ERWIN, SC (reprint author), UNIV PENN,DEPT PHYS,PHILADELPHIA,PA 19104, USA. RI Erwin, Steven/B-1850-2009 NR 16 TC 18 Z9 18 U1 0 U2 1 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0038-1098 J9 SOLID STATE COMMUN JI Solid State Commun. PD MAR PY 1992 VL 81 IS 11 BP 891 EP 894 DI 10.1016/0038-1098(92)90863-5 PG 4 WC Physics, Condensed Matter SC Physics GA HM012 UT WOS:A1992HM01200003 ER PT J AU GOLDMAN, G WELBOURN, R KLAUSNER, JM VALERI, CR SHEPRO, D HECHTMAN, HB AF GOLDMAN, G WELBOURN, R KLAUSNER, JM VALERI, CR SHEPRO, D HECHTMAN, HB TI OXYGEN FREE-RADICALS ARE REQUIRED FOR ISCHEMIA-INDUCED LEUKOTRIENE-B4 SYNTHESIS AND DIAPEDESIS SO SURGERY LA English DT Article ID INDUCED LUNG INJURY; LIMB ISCHEMIA; MYOCARDIAL ISCHEMIA; LEUKOCYTE ADHESION; PERMEABILITY; NEUTROPHILS; ACTIVATION; REDUCTION; CELLS AB Hind limb ischemia and reperfusion have been shown to result in high plasma levels of leukotriene B4 (LTB4) and polymorphonuclear neutrophil (PMN) sequestration in the pulmonary microvasculature. This study tests whether LTB4 is derived from PMNs and its role in mediating ischemic plasma-induced diapedesis. Plasma derived from rabbit hind limbs after 3 hours of tourniquet ischemia and 10 minutes of reperfusion (n = 6) showed an increased LTB4 level of 560 pg/ml, higher than sham plasma values of 106 pg/ml (p < 0.05). Introduction of ischemic plasma in abraded skin chambers placed on the dorsum of normal rabbits (n = 6) led after 3 hours to PMN diapedesis of 1175 PMN/mm3, associated with a further increase in LTB4 levels to 820 pg/ml (both p < 0.05). In contrast, ischemic plasma derived from neutropenic animals (n = 4; nitrogen mustard, 2 mg/kg; PMNs < 30/mm3) contained lower levels of LTB4, 160 pg/ml (p < 0.05). When introduced in skin chambers in normal rabbits (n = 4), this plasma induced accumulations of only 163 PMN/mm3, accompanied by a smaller increase in LTB4 levels in the blister fluid after 3 hours, 397 pg/ml (both p < 0.05). A correlation was found between LTB4 levels in ischemic plasma and PMN accumulations in blister fluid (r = 0.92; p < 0.05). Intravenous pretreatment of rabbits (n = 4) used in the blister chamber bioassay with the LT receptor antagonist FPL-55712, 40-mu-g/kg/hr, attenuated diapedesis induced by ischemic and ischemic-neutropenic plasma, 103 and 35 PMN/mm3, respectively (both p < 0.05). Pretreatment with superoxide dismutase, 1500 units/kg, and catalase, 5000 units/kg, both conjugated to polyethylene glycol (n = 4), prevented ischemic plasma-induced LTB4 synthesis, as well as ischemic plasma-induced diapedesis, 12 PMN/mm3 (p < 0.05). Finally, pretreatment with allopurinol, 25 mg/kg, was similarly effective in preventing LTB4 synthesis and PMN migration. These data suggest that oxygen free radicals are essential for ischemia-induced PMN synthesis of LTB4 that in turn mediates their diapedesis. C1 BRIGHAM & WOMENS HOSP,DEPT SURG,75 FRANCIS ST,BOSTON,MA 02115. HARVARD UNIV,SCH MED,BOSTON,MA 02115. USN,BLOOD RES LAB,BOSTON,MA. BOSTON UNIV,CTR BIOL SCI,BOSTON,MA 02215. FU NHLBI NIH HHS [HL16714-13]; NIGMS NIH HHS [GM24891-11, GM35141-03] NR 24 TC 27 Z9 28 U1 0 U2 0 PU MOSBY-YEAR BOOK INC PI ST LOUIS PA 11830 WESTLINE INDUSTRIAL DR, ST LOUIS, MO 63146-3318 SN 0039-6060 J9 SURGERY JI Surgery PD MAR PY 1992 VL 111 IS 3 BP 287 EP 293 PG 7 WC Surgery SC Surgery GA HG787 UT WOS:A1992HG78700008 PM 1311874 ER PT J AU GARTNER, SL WILLIAMS, TJ AF GARTNER, SL WILLIAMS, TJ TI MODULATION OF INTERLEUKIN-1 INDUCED THYMOCYTE PROLIFERATION BY D-MANNOSE SO THYMUS LA English DT Note DE CYTOKINE; INTERLEUKIN-1; MANNOSE; THYMOCYTE PROLIFERATION ID HUMAN-LYMPHOCYTES; PROTEIN AB We examined the effect of various carbohydrates on the proliferative response of murine thymocytes to cytokines. The monosaccharide, D-mannose (4-10 mM), significantly inhibited thymocyte proliferation induced by recombinant interleukin-1 (rIL-1). Mannose also inhibited the proliferation response to native, human IL-1. Inhibition was specific for D-mannose and methyl-alpha-D-mannopyranoside. Other carboydrates, including L-mannose and D-glucose did not inhibit thymocyte growth. Thymocyte proliferation induced by either IL-2 or pokeweed mitogen was also inhibited by mannose. Mannose was effective in inhibiting T-cell proliferation even when added 48 hours after the start of the experiment. Mannose did not appear to be toxic to the thymocytes as judged by trypan blue exclusion. These data are consistent with the hypothesis that specific carbohydrates may alter immune function. Manipulation of immune function via blocking cytokine activity may be useful in certain pathological conditions. RP GARTNER, SL (reprint author), USN,MED RES INST,BETHESDA,MD 20889, USA. NR 18 TC 0 Z9 0 U1 0 U2 0 PU KLUWER ACADEMIC PUBL PI DORDRECHT PA SPUIBOULEVARD 50, PO BOX 17, 3300 AA DORDRECHT, NETHERLANDS SN 0165-6090 J9 THYMUS JI Thymus PD MAR PY 1992 VL 19 IS 2 BP 117 EP 126 PG 10 WC Immunology SC Immunology GA HG878 UT WOS:A1992HG87800007 PM 1561701 ER PT J AU FARID, Z AF FARID, Z TI MULTIRESISTANT SALMONELLA-TYPHI INFECTION IN CAIRO SO TRANSACTIONS OF THE ROYAL SOCIETY OF TROPICAL MEDICINE AND HYGIENE LA English DT Letter RP FARID, Z (reprint author), AMER EMBASSY,USN,MED RES UNIT 3,CAIRO,EGYPT. NR 2 TC 3 Z9 3 U1 0 U2 0 PU ROYAL SOC TROPICAL MEDICINE PI LONDON PA MANSON HOUSE 26 PORTLAND PLACE, LONDON, ENGLAND W1N 4EY SN 0035-9203 J9 T ROY SOC TROP MED H JI Trans. Roy. Soc. Trop. Med. Hyg. PD MAR-APR PY 1992 VL 86 IS 2 BP 224 EP 224 DI 10.1016/0035-9203(92)90584-Y PG 1 WC Public, Environmental & Occupational Health; Tropical Medicine SC Public, Environmental & Occupational Health; Tropical Medicine GA HV022 UT WOS:A1992HV02200039 PM 1440797 ER PT J AU STRIFORS, HC GAUNAURD, GC AF STRIFORS, HC GAUNAURD, GC TI DIFFERENCES IN THE ACOUSTIC ECHOES FROM SUBMERGED ELASTIC SHELLS CONTAINING DIFFERENT FLUIDS SO ULTRASONICS LA English DT Article DE ACOUSTIC ECHOES; SUBMERGED ELASTIC SHELLS; SCATTERING OF WAVES AB It is desirable to be able to distinguish between a submerged metal object and one essentially composed of air-filled membranes, such as fish. This target-identity problem has been addressed before. Another target-identity problem still to be addressed is that of distinguishing between a (water-tight) metal shell containing air inside and the same shell with defective seals that flood it with water, e.g. empty oil drums or old refrigerators that may be lying on the sea floor, before and after becoming flooded. Debris of this type is apparently abundant in many shallow coastal waters. The characterization would be done remotely, by analysis of the acoustic echoes returned by these scatterers. We have constructed a predictive model that simulates the resonance echoes returned by a spherical steel shell (of various thicknesses), first air-filled and then flooded with water. As a first approximation, the shell is assumed to be many characteristic dimensions away from the seafloor. We then extract the spectrum of resonances in both cases and exhibit their extraordinary difference in features. These could then be used to easily distinguish between both active signatures, remotely and in situ. C1 USN,CTR SURFACE WARFARE,RES DEPT,SILVER SPRING,MD 20903. RP STRIFORS, HC (reprint author), NATL DEF RES ESTAB FOA2,S-17290 SUNDBYBERG,SWEDEN. NR 14 TC 6 Z9 6 U1 0 U2 0 PU BUTTERWORTH-HEINEMANN LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, OXON, ENGLAND OX5 1GB SN 0041-624X J9 ULTRASONICS JI Ultrasonics PD MAR PY 1992 VL 30 IS 2 BP 107 EP 112 DI 10.1016/0041-624X(92)90043-L PG 6 WC Acoustics; Radiology, Nuclear Medicine & Medical Imaging SC Acoustics; Radiology, Nuclear Medicine & Medical Imaging GA HL422 UT WOS:A1992HL42200008 ER PT J AU DUTKA, AJ MINK, RB PEARSON, RR HALLENBECK, JM AF DUTKA, AJ MINK, RB PEARSON, RR HALLENBECK, JM TI EFFECTS OF TREATMENT WITH DEXAMETHASONE ON RECOVERY FROM EXPERIMENTAL CEREBRAL ARTERIAL GAS EMBOLISM SO UNDERSEA BIOMEDICAL RESEARCH LA English DT Article DE CORTICOSTEROIDS; CEREBRAL EDEMA; CEREBRAL GAS EMBOLISM; CEREBRAL ISCHEMIA; CEREBRAL BLOOD FLOW ID SOMATOSENSORY EVOKED-POTENTIALS; ISCHEMIC BRAIN EDEMA; SEVERE HEAD-INJURY; BLOOD-FLOW; AIR-EMBOLISM; MONKEY AB Dexamethasone is often recommended as an adjunct to recompression in the treatment of serious central nervous system decompression accidents. We studied the effects of prophylactic and therapeutic administration of dexamethasone combined with hyperbaric treatment in anesthetized dogs that were subjected to carotid air embolism and a brief episode of arterial hypertension. To assess recovery we measured somatosensory evoked potential (SSEP) amplitude, intracranial pressure, brain water, and cerebral blood flow. Three groups were studied: pre-air treatment (dexamethasone 1 mg/kg 3-4 h before carotid air embolism, and 1 mg/kg immediately after air embolism); post-air treatment (2 mg/kg immediately after air embolism); and control (equivalent volumes of saline pre- and post-air). There was a slight improvement in SSEP early in the course of hyperbaric therapy in the pre-air treated group; the post-air group never differed from control. No differences in intracranial pressure or brain water were found among groups. No blood flows below those lethal to neurons occurred in treated animals but 4 of 7 control animals had low flows. Although prophylactic treatment with dexamethasone produces some improvement in recovery, we cannot confirm that dexamethasone is an effective adjunct to recompression when administered therapeutically. C1 USN, MED RES INST, BETHESDA, MD 20814 USA. UNIFORMED SERV UNIV HLTH SCI, DEPT NEUROL, BETHESDA, MD 20814 USA. CHILDRENS HOSP, NATL MED CTR, DEPT CRIT CARE MED, WASHINGTON, DC 20010 USA. NINCDS, STROKE BRANCH, BETHESDA, MD 20892 USA. RP DUTKA, AJ (reprint author), NATL NAVAL MED CTR, DEPT NEUROL, BETHESDA, MD 20814 USA. NR 29 TC 20 Z9 20 U1 0 U2 1 PU UNDERSEA & HYPERBARIC MEDICAL SOC INC PI KENSINGTON PA 10531 METROPOLITAN AVE, KENSINGTON, MD 20895 SN 0093-5387 J9 UNDERSEA BIOMED RES PD MAR PY 1992 VL 19 IS 2 BP 131 EP 141 PG 11 WC Oceanography SC Oceanography GA HL157 UT WOS:A1992HL15700006 PM 1561719 ER PT J AU MORRA, MN MANSON, AL GAVRELL, GJ QUINN, AD AF MORRA, MN MANSON, AL GAVRELL, GJ QUINN, AD TI RHABDOMYOMA OF PROSTATE SO UROLOGY LA English DT Article ID ADULT RHABDOMYOMA AB An asymptomatic nineteen-year-old white man presented with a markedly enlarged and indurated prostate. Urologic evaluation including cystoscopy, prostatic ultrasound, pelvic computerized tomography (CT) scan, and pelvic nuclear magnetic resonance imaging revealed a prostatic mass impinging on the bladder. Transrectal biopsies returned the pathologic diagnosis of rhabdomyomatous hamartoma. We report the first case in the English literature of extracardiac rhabdomyoma found in the male genitourinary tract. C1 USN HOSP,DEPT UROL,OAKLAND,CA. NR 6 TC 6 Z9 8 U1 0 U2 0 PU CAHNERS PUBL CO PI NEW YORK PA 249 WEST 17 STREET, NEW YORK, NY 10011 SN 0090-4295 J9 UROLOGY JI UROLOGY PD MAR PY 1992 VL 39 IS 3 BP 271 EP 273 DI 10.1016/0090-4295(92)90304-F PG 3 WC Urology & Nephrology SC Urology & Nephrology GA HJ265 UT WOS:A1992HJ26500017 PM 1546423 ER PT J AU HUISMAN, TK SANDS, JP AF HUISMAN, TK SANDS, JP TI FOCAL XANTHOGRANULOMATOUS PYELONEPHRITIS ASSOCIATED WITH RENAL-CELL CARCINOMA SO UROLOGY LA English DT Article AB A case of focal xanthogranulomatous pyelonephritis (XGP) with an associated renal cell carcinoma is presented. The tumor was discovered incidentally during a general surgical procedure. Subsequent evaluation showed a 3 cm mass in the lower pole of an otherwise normal kidney with no evidence of calculus or infection. Radical nephrectomy revealed classic findings of focal XGP with coexistent clear cell carcinoma. The literature describing the rare association between these conditions is reviewed. C1 USN,DEPT UROL,SAN DIEGO,CA 92134. NR 13 TC 18 Z9 18 U1 0 U2 0 PU CAHNERS PUBL CO PI NEW YORK PA 249 WEST 17 STREET, NEW YORK, NY 10011 SN 0090-4295 J9 UROLOGY JI UROLOGY PD MAR PY 1992 VL 39 IS 3 BP 281 EP 284 DI 10.1016/0090-4295(92)90307-I PG 4 WC Urology & Nephrology SC Urology & Nephrology GA HJ265 UT WOS:A1992HJ26500020 PM 1546425 ER PT J AU KRESIN, VZ WOLF, SA DEUTSCHER, G AF KRESIN, VZ WOLF, SA DEUTSCHER, G TI CORRELATION BETWEEN MICROSTRUCTURE AND PROPERTIES OF HIGH-TC FILMS - APPLICATION TO MICROWAVE PROPERTIES SO MATERIALS SCIENCE AND ENGINEERING B-SOLID STATE MATERIALS FOR ADVANCED TECHNOLOGY LA English DT Article; Proceedings Paper CT SYMP ON SOLID STATE IONICS AT THE INTERNATIONAL CONF ON ADVANCED MATERIALS CY MAY 27-31, 1991 CL STRASBOURG, FRANCE ID ENERGY-GAP; TRANSITION-TEMPERATURE; SUPERCONDUCTING STATE; OXIDE SUPERCONDUCTORS; YBA2CU3O7; CONDUCTIVITY; PARAMETERS; CRYSTAL AB The Y-Ba-Cu-O compound contains two conductive subsystems and as a result displays a two-gap structure. Oxygen ordering affects the value of the smaller gap. Charge transfer leads to an induced superconducting state in the chains. The short coherence length, anisotropy and the presence of different structural units lead to peculiar microwave properties of high T(c) films. In this paper the authors describe their approach to the theory of high T(c) films and then focus on the microwave properties of the films. C1 USN,RES LAB,WASHINGTON,DC 20375. TEL AVIV UNIV,DEPT PHYS & ASTRON,IL-69978 TEL AVIV,ISRAEL. RP KRESIN, VZ (reprint author), UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,BERKELEY,CA 94720, USA. RI Wolf, Stuart/A-7513-2009 NR 37 TC 1 Z9 1 U1 0 U2 0 PU ELSEVIER SCIENCE SA LAUSANNE PI LAUSANNE 1 PA PO BOX 564, 1001 LAUSANNE 1, SWITZERLAND SN 0921-5107 J9 MAT SCI ENG B-SOLID JI Mater. Sci. Eng. B-Solid State Mater. Adv. Technol. PD FEB 29 PY 1992 VL 12 IS 4 BP 365 EP 368 DI 10.1016/0921-5107(92)90007-V PG 4 WC Materials Science, Multidisciplinary; Physics, Condensed Matter SC Materials Science; Physics GA HJ206 UT WOS:A1992HJ20600007 ER PT J AU BAGAR, S PACHECO, ND ROLLWAGEN, FM AF BAGAR, S PACHECO, ND ROLLWAGEN, FM TI MUCOSAL AND SYSTEMIC IMMUNE-RESPONSES TO CAMPYLOBACTER-JEJUNI IN MICE SO FASEB JOURNAL LA English DT Meeting Abstract C1 GEOCENTERS INC,FT WASHINGTON,MD 20889. 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 USA SN 0892-6638 J9 FASEB J JI Faseb J. PD FEB 28 PY 1992 VL 6 IS 5 BP A2060 EP A2060 PN 2 PG 1 WC Biochemistry & Molecular Biology; Biology; Cell Biology SC Biochemistry & Molecular Biology; Life Sciences & Biomedicine - Other Topics; Cell Biology GA HH271 UT WOS:A1992HH27102674 ER PT J AU BHAGWAT, SA THOMAS, JR BLIGH, ME CASTONGUAY, TW AF BHAGWAT, SA THOMAS, JR BLIGH, ME CASTONGUAY, TW TI THE DIURNAL RHYTHMICITY OF PLASMA-ALDOSTERONE IN THE MALE SPRAGUE-DAWLEY RAT SO FASEB JOURNAL LA English DT Meeting Abstract C1 UNIV MARYLAND,COLLEGE PK,MD 20742. USN,MED RES INST,BETHESDA,MD 20814. NR 0 TC 2 Z9 2 U1 0 U2 0 PU FEDERATION AMER SOC EXP BIOL PI BETHESDA PA 9650 ROCKVILLE PIKE, BETHESDA, MD 20814-3998 USA SN 0892-6638 J9 FASEB J JI Faseb J. PD FEB 28 PY 1992 VL 6 IS 5 BP A1774 EP A1774 PN 2 PG 1 WC Biochemistry & Molecular Biology; Biology; Cell Biology SC Biochemistry & Molecular Biology; Life Sciences & Biomedicine - Other Topics; Cell Biology GA HH271 UT WOS:A1992HH27101010 ER PT J AU HARFORD, R REED, L MORRIS, M SAPIEN, I WARDEN, R KOWALSKI, K LOPEZ, A DALESANDRO, M AF HARFORD, R REED, L MORRIS, M SAPIEN, I WARDEN, R KOWALSKI, K LOPEZ, A DALESANDRO, M TI ALTERATIONS IN THYROTROPIN, TOTAL AND LIPOPROTEIN CHOLESTEROL WITH ANTARCTIC RESIDENCE 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 USA SN 0892-6638 J9 FASEB J JI Faseb J. PD FEB 28 PY 1992 VL 6 IS 5 BP A1830 EP A1830 PN 2 PG 1 WC Biochemistry & Molecular Biology; Biology; Cell Biology SC Biochemistry & Molecular Biology; Life Sciences & Biomedicine - Other Topics; Cell Biology GA HH271 UT WOS:A1992HH27101333 ER PT J AU KAYAR, SR HARABIN, AL AF KAYAR, SR HARABIN, AL TI EFFECTS OF HYPERBARIC HYDROGEN ON OXYGEN-CONSUMPTION 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 USA SN 0892-6638 J9 FASEB J JI Faseb J. PD FEB 28 PY 1992 VL 6 IS 5 BP A1748 EP A1748 PN 2 PG 1 WC Biochemistry & Molecular Biology; Biology; Cell Biology SC Biochemistry & Molecular Biology; Life Sciences & Biomedicine - Other Topics; Cell Biology GA HH271 UT WOS:A1992HH27100858 ER PT J AU KOWALSKI, K REED, L VANTUYL, M HARFORD, R HOMER, L AF KOWALSKI, K REED, L VANTUYL, M HARFORD, R HOMER, L TI CHANGE IN OXYGEN-CONSUMPTION IN COLD CLIMATE ASSESSED WITH A SUBMAXIMAL CYCLE ERGOMETER TEST 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 USA SN 0892-6638 J9 FASEB J JI Faseb J. PD FEB 28 PY 1992 VL 6 IS 5 BP A1830 EP A1830 PN 2 PG 1 WC Biochemistry & Molecular Biology; Biology; Cell Biology SC Biochemistry & Molecular Biology; Life Sciences & Biomedicine - Other Topics; Cell Biology GA HH271 UT WOS:A1992HH27101337 ER PT J AU PERRIN, PJ MONROY, RL AF PERRIN, PJ MONROY, RL TI REGULATION OF CYTOKINE DIRECTED GRANULOPOIESIS WITH A C-JUN SPECIFIC ANTISENSE OLIGONUCLEOTIDE SO FASEB JOURNAL LA English DT Meeting Abstract C1 GEOCENTERS INC,FT WASHINGTON,MD 20744. 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 USA SN 0892-6638 J9 FASEB J JI Faseb J. PD FEB 28 PY 1992 VL 6 IS 5 BP A2053 EP A2053 PN 2 PG 1 WC Biochemistry & Molecular Biology; Biology; Cell Biology SC Biochemistry & Molecular Biology; Life Sciences & Biomedicine - Other Topics; Cell Biology GA HH271 UT WOS:A1992HH27102630 ER PT J AU QUESADA, MH REED, L COSGROVE, S LICAUCO, G CASTRO, S DALESANDRO, M HOMER, L YOUNG, B AF QUESADA, MH REED, L COSGROVE, S LICAUCO, G CASTRO, S DALESANDRO, M HOMER, L YOUNG, B TI CHANGES IN PORCINE TRIIODOTHYRONINE DISTRIBUTION AFTER PROLONGED COLD-EXPOSURE VERSUS A SHORT-TERM EXPOSURE SO FASEB JOURNAL LA English DT Meeting Abstract C1 UNIV ALBERTA,EDMONTON T6G 2P5,ALBERTA,CANADA. 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 USA SN 0892-6638 J9 FASEB J JI Faseb J. PD FEB 28 PY 1992 VL 6 IS 5 BP A1830 EP A1830 PN 2 PG 1 WC Biochemistry & Molecular Biology; Biology; Cell Biology SC Biochemistry & Molecular Biology; Life Sciences & Biomedicine - Other Topics; Cell Biology GA HH271 UT WOS:A1992HH27101335 ER PT J AU RABBANY, SY WEMHOFF, G KUSTERBECK, AW BREDEHORST, R LIGLER, FS AF RABBANY, SY WEMHOFF, G KUSTERBECK, AW BREDEHORST, R LIGLER, FS TI KINETICS OF ANTIBODY-BINDING IN A FLOW IMMUNOSENSOR SO FASEB JOURNAL LA English DT Meeting Abstract C1 HOFSTRA UNIV,HEMPSTEAD,NY 11550. USN,RES LAB,WASHINGTON,DC 20375. UNIV HAMBURG,W-2000 HAMBURG 13,GERMANY. 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 USA SN 0892-6638 J9 FASEB J JI Faseb J. PD FEB 28 PY 1992 VL 6 IS 5 BP A2014 EP A2014 PN 2 PG 1 WC Biochemistry & Molecular Biology; Biology; Cell Biology SC Biochemistry & Molecular Biology; Life Sciences & Biomedicine - Other Topics; Cell Biology GA HH271 UT WOS:A1992HH27102403 ER PT J AU REED, L QUESADA, M COSGROVE, S DALESANDRO, M HARFORD, R CASTRO, S TURNER, B CHRISTOPHERSON, R YOUNG, B AF REED, L QUESADA, M COSGROVE, S DALESANDRO, M HARFORD, R CASTRO, S TURNER, B CHRISTOPHERSON, R YOUNG, B TI CHANGES IN PORCINE SERUM TRIIODOTHYRONINE (T3) KINETICS WITH PROLONGED EXPOSURE TO COLD AIR SO FASEB JOURNAL LA English DT Meeting Abstract C1 UNIV ALBERTA,EDMONTON T6G 2P5,ALBERTA,CANADA. 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 USA SN 0892-6638 J9 FASEB J JI Faseb J. PD FEB 28 PY 1992 VL 6 IS 5 BP A1830 EP A1830 PN 2 PG 1 WC Biochemistry & Molecular Biology; Biology; Cell Biology SC Biochemistry & Molecular Biology; Life Sciences & Biomedicine - Other Topics; Cell Biology GA HH271 UT WOS:A1992HH27101332 ER PT J AU RICHARDS, AL JACKSON, LM DASCH, GA AF RICHARDS, AL JACKSON, LM DASCH, GA TI INFECTION AND PERSISTENCE OF RICKETTSIA-PROWAZEKII R-TYPHI, AND R-RICKETTSII IN HUMAN MONONUCLEAR PHAGOCYTES 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 USA SN 0892-6638 J9 FASEB J JI Faseb J. PD FEB 28 PY 1992 VL 6 IS 5 BP A1712 EP A1712 PN 2 PG 1 WC Biochemistry & Molecular Biology; Biology; Cell Biology SC Biochemistry & Molecular Biology; Life Sciences & Biomedicine - Other Topics; Cell Biology GA HH271 UT WOS:A1992HH27100652 ER PT J AU ROLLWAGEN, FM BAGAR, S PACHECO, ND SPARGO, B RUDOLPH, AS AF ROLLWAGEN, FM BAGAR, S PACHECO, ND SPARGO, B RUDOLPH, AS TI ADMINISTRATION OF CYTOKINES IN AGAROSE ATTRACT DIFFERENT CELL-POPULATIONS TO THE LOCAL SITE SO FASEB JOURNAL LA English DT Meeting Abstract C1 USN,MED RES INST,BETHESDA,MD 20814. GEOCENTERS INC,FT WASHINGTON,MD. USN,RES LAB,WASHINGTON,DC 20375. NR 0 TC 0 Z9 0 U1 0 U2 0 PU FEDERATION AMER SOC EXP BIOL PI BETHESDA PA 9650 ROCKVILLE PIKE, BETHESDA, MD 20814-3998 USA SN 0892-6638 J9 FASEB J JI Faseb J. PD FEB 28 PY 1992 VL 6 IS 5 BP A2060 EP A2060 PN 2 PG 1 WC Biochemistry & Molecular Biology; Biology; Cell Biology SC Biochemistry & Molecular Biology; Life Sciences & Biomedicine - Other Topics; Cell Biology GA HH271 UT WOS:A1992HH27102673 ER PT J AU WEINBERG, RP HYDE, D GARNER, W HEWLETT, S AF WEINBERG, RP HYDE, D GARNER, W HEWLETT, S TI EFFECT OF HEATING ON DIVER HAND HEAT-LOSS 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 USA SN 0892-6638 J9 FASEB J JI Faseb J. PD FEB 28 PY 1992 VL 6 IS 5 BP A1830 EP A1830 PN 2 PG 1 WC Biochemistry & Molecular Biology; Biology; Cell Biology SC Biochemistry & Molecular Biology; Life Sciences & Biomedicine - Other Topics; Cell Biology GA HH271 UT WOS:A1992HH27101334 ER PT J AU OLAH, GA SASSAMAN, MB ZUANIC, M RAO, CB PRAKASH, GKS GILARDI, R FLIPPENANDERSON, J GEORGE, C AF OLAH, GA SASSAMAN, MB ZUANIC, M RAO, CB PRAKASH, GKS GILARDI, R FLIPPENANDERSON, J GEORGE, C TI CONSIDERED SYNTHETIC METHODS AND REACTIONS .165. ONE-STEP PREPARATION OF HYDRAZINIUM NITRATES FROM TERTIARY-AMINES AND AZAARENES WITH H2NOSO3H/BA(NO3)2/BAO AND CONVERSION TO ENERGETIC AMINE-NITROIMIDES SO JOURNAL OF ORGANIC CHEMISTRY LA English DT Article C1 UNIV SO CALIF,DEPT CHEM,LOS ANGELES,CA 90089. USN,RES LAB,STRUCT MAT LAB,WASHINGTON,DC 20375. RP OLAH, GA (reprint author), UNIV SO CALIF,DONALD P & KATHERINE B LOKER HYDROCARBON RES INST,LOS ANGELES,CA 90089, USA. NR 25 TC 8 Z9 8 U1 0 U2 1 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 FEB 28 PY 1992 VL 57 IS 5 BP 1585 EP 1588 DI 10.1021/jo00031a046 PG 4 WC Chemistry, Organic SC Chemistry GA HG741 UT WOS:A1992HG74100046 ER PT J AU WILLIAMS, TM FRIEDL, WA FONG, ML YAMADA, RM SEDIVY, P HAUN, JE AF WILLIAMS, TM FRIEDL, WA FONG, ML YAMADA, RM SEDIVY, P HAUN, JE TI TRAVEL AT LOW ENERGETIC COST BY SWIMMING AND WAVE-RIDING BOTTLE-NOSED DOLPHINS SO NATURE LA English DT Article ID LOCOMOTION AB OVER the past 50 years there has been much speculation about the energetic cost of swimming and wave-riding by dolphins 1-11. When aligned properly in front of the bow of moving ships 1-3, in the stern wake of small boats 4,5, on wind waves 6, and even in the wake of larger cetaceans 7-9, the animals appear to move effortlessly through the water without the benefit of propulsive strokes by the flukes. Theoretically, body streamlining as well as other anatomical and behavioural adaptations contribute to low transport costs in these animals. The economy of movement permitted by wave-riding has been perceived as an energetic advantage for the swimming dolphin 2,310, but has been hard to prove in the absence of physiological data for exercising cetaceans. Here we determine the aerobic and anaerobic costs of swimming and wave-riding in bottlenose dolphins and find that the minimum cost of transport for swimming dolphins is 1.29 +/- 0.05 J kg-1 m-1 at a cruising speed of 2.1 m s-1. Aerobic costs are nearly twice as high for swimming 12. seals and sea lions, and 8-12 times higher for human swimmers Wave-riding by dolphins provides additional benefits in terms of speed. The results indicate that behavioural, physiological and morphological factors make swimming an economical form of high-speed travel for dolphins. RP WILLIAMS, TM (reprint author), USN,CTR OCEANS SYST,HAWAII LAB,POB 997,CODE 511,KAILUA,HI 96734, USA. NR 27 TC 91 Z9 95 U1 4 U2 29 PU MACMILLAN MAGAZINES LTD PI LONDON PA PORTERS SOUTH, 4 CRINAN ST, LONDON, ENGLAND N1 9XW SN 0028-0836 J9 NATURE JI Nature PD FEB 27 PY 1992 VL 355 IS 6363 BP 821 EP 823 DI 10.1038/355821a0 PG 3 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA HF636 UT WOS:A1992HF63600054 PM 1538760 ER PT J AU BLIGH, ME THOMAS, JR BHAGWAT, SA CASTONGUAY, TW AF BLIGH, ME THOMAS, JR BHAGWAT, SA CASTONGUAY, TW TI THE EFFECTS OF FOOD-DEPRIVATION AND CHRONIC COLD-EXPOSURE ON MACRONUTRIENT SELECTION - AN ENDOCRINE HYPOTHESIS SO FASEB JOURNAL LA English DT Meeting Abstract C1 UNIV MARYLAND,COLLEGE PK,MD 20742. USN,MED RES INST,BETHESDA,MD 20814. NR 0 TC 0 Z9 0 U1 0 U2 0 PU FEDERATION AMER SOC EXP BIOL PI BETHESDA PA 9650 ROCKVILLE PIKE, BETHESDA, MD 20814-3998 SN 0892-6638 J9 FASEB J JI Faseb J. PD FEB 26 PY 1992 VL 6 IS 4 BP A1367 EP A1367 PN 1 PG 1 WC Biochemistry & Molecular Biology; Biology; Cell Biology SC Biochemistry & Molecular Biology; Life Sciences & Biomedicine - Other Topics; Cell Biology GA HG719 UT WOS:A1992HG71902493 ER PT J AU COOPER, LJN CHAROENVIT, Y HOFFMAN, SL GREENSPAN, NS AF COOPER, LJN CHAROENVIT, Y HOFFMAN, SL GREENSPAN, NS TI COOPERATIVE BINDING OF A MURINE IGG3 ANTIBODY TO A MALARIA CIRCUMSPOROZOITE PROTEIN (RCSP) SO FASEB JOURNAL LA English DT Meeting Abstract C1 CASE WESTERN RESERVE UNIV,CLEVELAND,OH 44106. USN,MED RES INST,BETHESDA,MD 20889. NR 1 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 FEB 26 PY 1992 VL 6 IS 4 BP A1221 EP A1221 PN 1 PG 1 WC Biochemistry & Molecular Biology; Biology; Cell Biology SC Biochemistry & Molecular Biology; Life Sciences & Biomedicine - Other Topics; Cell Biology GA HG719 UT WOS:A1992HG71901644 ER PT J AU HYDE, D THORP, JW DOUBT, TJ AF HYDE, D THORP, JW DOUBT, TJ TI DESAMINO ARGININE VASOPRESSIN (DDAVP) AND IMMERSION DIURESIS DURING WARM WATER DIVING SO FASEB JOURNAL LA English DT Meeting Abstract C1 USN,MED RES INST,BETHESDA,MD 20889. NR 0 TC 0 Z9 0 U1 0 U2 0 PU FEDERATION AMER SOC EXP BIOL PI BETHESDA PA 9650 ROCKVILLE PIKE, BETHESDA, MD 20814-3998 SN 0892-6638 J9 FASEB J JI Faseb J. PD FEB 26 PY 1992 VL 6 IS 4 BP A1541 EP A1541 PN 1 PG 1 WC Biochemistry & Molecular Biology; Biology; Cell Biology SC Biochemistry & Molecular Biology; Life Sciences & Biomedicine - Other Topics; Cell Biology GA HG719 UT WOS:A1992HG71903501 ER PT J AU KAUFMAN, JW SCHERER, PW AF KAUFMAN, JW SCHERER, PW TI PREDICTED SENSITIVITY OF TEMPERATURE AND WATER-VAPOR WASHOUT TO CHANGES IN THE HUMAN AIRWAY SO FASEB JOURNAL LA English DT Meeting Abstract C1 USN,CTR AIR DEV,WARMINSTER,PA 18974. UNIV PENN,PHILADELPHIA,PA 19104. 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 FEB 26 PY 1992 VL 6 IS 4 BP A1478 EP A1478 PN 1 PG 1 WC Biochemistry & Molecular Biology; Biology; Cell Biology SC Biochemistry & Molecular Biology; Life Sciences & Biomedicine - Other Topics; Cell Biology GA HG719 UT WOS:A1992HG71903139 ER PT J AU NEISLER, HM LOTZ, WG JOHNSON, KD MEYER, LG HORRIGAN, DJ AF NEISLER, HM LOTZ, WG JOHNSON, KD MEYER, LG HORRIGAN, DJ TI PLASMA-VOLUME AND BIOCHEMICAL RESPONSES DURING 3 DAYS OF SIMULATED DESERT CONDITIONS WITH 3 REHYDRATION BEVERAGES SO FASEB JOURNAL LA English DT Meeting Abstract C1 USN,AEROSP MED RES LAB,PENSACOLA,FL 32508. NR 0 TC 1 Z9 1 U1 0 U2 0 PU FEDERATION AMER SOC EXP BIOL PI BETHESDA PA 9650 ROCKVILLE PIKE, BETHESDA, MD 20814-3998 SN 0892-6638 J9 FASEB J JI Faseb J. PD FEB 26 PY 1992 VL 6 IS 4 BP A1198 EP A1198 PN 1 PG 1 WC Biochemistry & Molecular Biology; Biology; Cell Biology SC Biochemistry & Molecular Biology; Life Sciences & Biomedicine - Other Topics; Cell Biology GA HG719 UT WOS:A1992HG71901511 ER PT J AU ROBERTS, JM HOLMES, NE DOUBT, TJ AF ROBERTS, JM HOLMES, NE DOUBT, TJ TI GLUCOSE POLYMER INGESTION DECREASES FREE FATTY-ACID MOBILIZATION DURING PROLONGED EXERCISE IN COLD WATER 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 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 FEB 26 PY 1992 VL 6 IS 4 BP A1214 EP A1214 PN 1 PG 1 WC Biochemistry & Molecular Biology; Biology; Cell Biology SC Biochemistry & Molecular Biology; Life Sciences & Biomedicine - Other Topics; Cell Biology GA HG719 UT WOS:A1992HG71901602 ER PT J AU YAMADA, H JUNE, CH MOND, JJ AF YAMADA, H JUNE, CH MOND, JJ TI OSCILLATORY CALCIUM (CA) ELEVATION CORRELATES WITH MITOGENIC STIMULUS IN MURINE SPLENIC B-CELLS SO FASEB JOURNAL LA English DT Meeting Abstract C1 UNIFORMED SERV UNIV HLTH SCI,DEPT MED,BETHESDA,MD 20814. USN,MED RES INST,BETHESDA,MD 20814. NR 0 TC 0 Z9 0 U1 0 U2 0 PU FEDERATION AMER SOC EXP BIOL PI BETHESDA PA 9650 ROCKVILLE PIKE, BETHESDA, MD 20814-3998 SN 0892-6638 J9 FASEB J JI Faseb J. PD FEB 26 PY 1992 VL 6 IS 4 BP A1129 EP A1129 PN 1 PG 1 WC Biochemistry & Molecular Biology; Biology; Cell Biology SC Biochemistry & Molecular Biology; Life Sciences & Biomedicine - Other Topics; Cell Biology GA HG719 UT WOS:A1992HG71901118 ER PT J AU WHITNEY, WT DUIGNAN, MT FELDMAN, BJ AF WHITNEY, WT DUIGNAN, MT FELDMAN, BJ TI STIMULATED BRILLOUIN-SCATTERING PHASE CONJUGATION OF AN AMPLIFIED HYDROGEN-FLUORIDE LASER-BEAM SO APPLIED OPTICS LA English DT Note DE ABERRATION CORRECTION; HYDROGEN FLUORIDE LASER; LASER AMPLIFIER; PHASE CONJUGATION; STIMULATED BRILLOUIN SCATTERING ID RADIATION AB Optical phase conjugation through stimulated Brillouin scattering was used to correct phase aberrations on a beam that was double passed through a pulsed hydrogen fluoride laser amplifier. C1 POTOMAC PHOTON INC,LANHAM,MD 20706. RP WHITNEY, WT (reprint author), USN,RES LAB,PHYS BRANCH,WASHINGTON,DC 20375, USA. NR 12 TC 0 Z9 1 U1 4 U2 4 PU OPTICAL SOC AMER PI WASHINGTON PA 2010 MASSACHUSETTS AVE NW, WASHINGTON, DC 20036 SN 0003-6935 J9 APPL OPTICS JI Appl. Optics PD FEB 20 PY 1992 VL 31 IS 6 BP 699 EP 702 PG 4 WC Optics SC Optics GA HD626 UT WOS:A1992HD62600004 PM 20720670 ER PT J AU GAMMON, D SHANABROOK, BV RYAN, JC BROZAK, G KATZER, DS AF GAMMON, D SHANABROOK, BV RYAN, JC BROZAK, G KATZER, DS TI EXCHANGE AND CORRELATION IN QUASI-2-DIMENSIONAL PLASMAS IN QUANTUM-WELL STRUCTURES SO SURFACE SCIENCE LA English DT Article; Proceedings Paper CT 9TH INTERNATIONAL CONF ON THE ELECTRONIC PROPERTIES OF TWO-DIMENSIONAL SYSTEMS ( EP2DS-9 ) / 5TH INTERNATIONAL CONF ON MODULATED SEMICONDUCTOR STRUCTURES ( MSS-5 ) CY JUL 08-12, 1991 CL NARA, JAPAN SP YAMADA SCI FDN ID ELECTRON-GAS AB We present a comparison of experiment and theory of the intersubband excitations in GaAs/AlGaAs quantum well structures. We find that at moderate densities, calculations employing the local spin density approximation for exchange and correlation Coulomb interactions agree well with experimental results. At larger densities there appears to be a discrepancy. We discuss improvements to the theory due to nonlocal exchange and the potential importance of subband nonparabolicity. RP GAMMON, D (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. RI Katzer, D. Scott/N-7841-2013 NR 9 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 FEB 19 PY 1992 VL 263 IS 1-3 BP 471 EP 474 DI 10.1016/0039-6028(92)90391-I PG 4 WC Chemistry, Physical; Physics, Condensed Matter SC Chemistry; Physics GA HF186 UT WOS:A1992HF18600095 ER PT J AU DEVEAUD, B CLEROT, F ROY, N SERMAGE, B KATZER, DS AF DEVEAUD, B CLEROT, F ROY, N SERMAGE, B KATZER, DS TI ENHANCED RADIATIVE RECOMBINATION OF FREE-EXCITONS IN GAAS QUANTUM-WELLS SO SURFACE SCIENCE LA English DT Article; Proceedings Paper CT 9TH INTERNATIONAL CONF ON THE ELECTRONIC PROPERTIES OF TWO-DIMENSIONAL SYSTEMS ( EP2DS-9 ) / 5TH INTERNATIONAL CONF ON MODULATED SEMICONDUCTOR STRUCTURES ( MSS-5 ) CY JUL 08-12, 1991 CL NARA, JAPAN SP YAMADA SCI FDN ID SUPERLATTICE; RELAXATION; DYNAMICS; ENERGY; DECAY AB Radiative properties of free excitons in a single GaAs quantum well are studied under resonant excitation. Superradiant decay of the excitons is evidenced by the very short lifetime as well as by the strong intensity of the signal. Dephasing mechanisms, by destroying the phase coherence of the excitons, increase the observed lifetime. Quantitative agreement between the lifetime, the intensity and the homogeneous broadening is obtained. We deduce a radiative lifetime of 8 ps in the absence of dephasing mechanisms. C1 CTR NATL ETUD TELECOMMUN,F-92120 BAGNEUX,FRANCE. USN,RES LAB,WASHINGTON,DC 20375. RP DEVEAUD, B (reprint author), CTR NATL ETUD TELECOMMUN,F-22300 LANNION,FRANCE. RI Deveaud, Benoit/A-4782-2013; Katzer, D. Scott/N-7841-2013; Deveaud, Benoit/N-1947-2014 OI Deveaud, Benoit/0000-0002-9776-6314; Deveaud, Benoit/0000-0002-9776-6314 NR 26 TC 5 Z9 5 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 FEB 19 PY 1992 VL 263 IS 1-3 BP 491 EP 495 DI 10.1016/0039-6028(92)90395-M PG 5 WC Chemistry, Physical; Physics, Condensed Matter SC Chemistry; Physics GA HF186 UT WOS:A1992HF18600099 ER PT J AU YANG, MJ MOORE, WJ WAGNER, RJ WATERMAN, JR YANG, CH THOMPSON, PE DAVIS, JL AF YANG, MJ MOORE, WJ WAGNER, RJ WATERMAN, JR YANG, CH THOMPSON, PE DAVIS, JL TI PROPERTIES OF 2D-ELECTRONS AND ASSOCIATED BOUND DONORS IN DELTA-DOPED INSB SO SURFACE SCIENCE LA English DT Article; Proceedings Paper CT 9TH INTERNATIONAL CONF ON THE ELECTRONIC PROPERTIES OF TWO-DIMENSIONAL SYSTEMS ( EP2DS-9 ) / 5TH INTERNATIONAL CONF ON MODULATED SEMICONDUCTOR STRUCTURES ( MSS-5 ) CY JUL 08-12, 1991 CL NARA, JAPAN SP YAMADA SCI FDN ID INVERSION-LAYERS; CYCLOTRON; RESONANCE AB We have investigated magneto-transport and cyclotron resonance (CR) of a two-dimensional electron gas (2DEG) and associated bound donors in silicon delta-doped p-InSb, under a magnetic field up to 12 T at 4.2 K. Due to the high mobility of the 2DEG (approximately 20 000 cm2/V . s), the CR peaks originating from several subbands in the delta-doped region are observed for the first time. We have also observed an additional absorption peak, whose resonant position has an angular dependence opposite to that of the 2DEG. According to its resonant position and its dependence on the Si concentration, we attribute this additional peak to impurity CR where donors are in the vicinity of the delta-doped sheet. C1 USN,RES LAB,WASHINGTON,DC 20375. UNIV MARYLAND,DEPT ELECT ENGN,COLLEGE PK,MD 20742. RP YANG, MJ (reprint author), SFA INC,LANDOVER,MD 20785, USA. NR 14 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 J9 SURF SCI JI Surf. Sci. PD FEB 19 PY 1992 VL 263 IS 1-3 BP 595 EP 599 DI 10.1016/0039-6028(92)90416-4 PG 5 WC Chemistry, Physical; Physics, Condensed Matter SC Chemistry; Physics GA HF186 UT WOS:A1992HF18600120 ER PT J AU MCGRATH, KJ ROLAND, CM AF MCGRATH, KJ ROLAND, CM TI NMR-STUDY OF CHAIN INTERACTIONS IN FREEZE-DRIED POLYSTYRENE SOLUTIONS SO MACROMOLECULES LA English DT Note ID NUCLEAR MAGNETIC-RESONANCE; MAGIC ANGLE; POLYMERS; FLUORESCENCE; MISCIBILITY; BLENDS RP MCGRATH, KJ (reprint author), USN,RES LAB,DIV CHEM,CODE 6120,WASHINGTON,DC 20375, USA. NR 16 TC 17 Z9 17 U1 0 U2 3 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0024-9297 J9 MACROMOLECULES JI Macromolecules PD FEB 17 PY 1992 VL 25 IS 4 BP 1366 EP 1367 DI 10.1021/ma00030a025 PG 2 WC Polymer Science SC Polymer Science GA HE834 UT WOS:A1992HE83400025 ER PT J AU LONG, JP GOLDENBERG, SS KABLER, MN AF LONG, JP GOLDENBERG, SS KABLER, MN TI PULSED LASER-INDUCED PHOTOCHEMICAL DECOMPOSITION OF GAAS(110) STUDIED WITH TIME-RESOLVED PHOTOELECTRON-SPECTROSCOPY USING SYNCHROTRON RADIATION SO PHYSICAL REVIEW LETTERS LA English DT Article ID SURFACE; PHOTOEMISSION; GAAS AB Cleaved GaAs surfaces decompose under weak pulsed-laser irradiation, leading to the formation of metallic Ga islands. The reduction of band-bending nonuniformities in photoemission spectra acquired during the laser pulses, in concert with new core-level fitting techniques which treat broadened spectra, permits a detailed analysis. A decomposition rate consistent with a two-step photochemical excitation process is measured. The surface remains largely intact on an atomic scale, but is increasingly unable to support excited surface states as decomposition proceeds. RP LONG, JP (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 17 TC 34 Z9 35 U1 0 U2 1 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0031-9007 J9 PHYS REV LETT JI Phys. Rev. Lett. PD FEB 17 PY 1992 VL 68 IS 7 BP 1014 EP 1017 DI 10.1103/PhysRevLett.68.1014 PG 4 WC Physics, Multidisciplinary SC Physics GA HE195 UT WOS:A1992HE19500030 ER PT J AU WOLFE, DH LIS, LJ KUCUK, O WESTERMAN, MP CUNNINGHAM, BA QADRI, SB BRAS, W QUINN, PJ AF WOLFE, DH LIS, LJ KUCUK, O WESTERMAN, MP CUNNINGHAM, BA QADRI, SB BRAS, W QUINN, PJ TI PHASE-TRANSITIONS BETWEEN RIPPLE STRUCTURES IN HYDRATED PHOSPHATIDYLCHOLINE-CHOLESTEROL MULTILAMELLAR ASSEMBLIES SO PHYSICAL REVIEW LETTERS LA English DT Article ID SYNCHROTRON X-RAY; PHOSPHOLIPID-BILAYERS; LIPID BILAYERS; LECITHIN; WATER; TEMPERATURE; DEPENDENCE; SYSTEM; MODEL AB A dynamic thermally induced cooperative first-order phase transition between ripple phases is described for fully hydrated mixtures of dipalmitoylphosphatidylcholine and 5-mole% cholesterol bilayers. The ripple-ripple phase transition has not been observed for pure phosphatidylcholine systems. This transition is more likely driven by changes in headgroup-water-headgroup interactions than by a change in acyl chain tilt. Implications for mechanical processes within a lipid bilayer are discussed. C1 MT SINAI HOSP MED CTR,CHICAGO MED SCH,DIV HEMATOL ONCOL,CHICAGO,IL 60608. VET AFFAIRS MED CTR,N CHICAGO,IL 60064. BUCKNELL UNIV,DEPT PHYS,LEWISBURG,PA 17837. USN,RES LAB,WASHINGTON,DC 20375. SERC,DARESBURY LAB,SCI & ENGN RES COUNCIL,WARRINGTON WA4 4AD,CHESHIRE,ENGLAND. KINGS COLL,DEPT BIOCHEM,LONDON W8 7AH,ENGLAND. RP WOLFE, DH (reprint author), LYCOMING COLL,DEPT ASTRON & PHYS,WILLIAMSPORT,PA 17701, USA. RI Bras, Wim/A-1026-2011 NR 22 TC 10 Z9 10 U1 0 U2 1 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0031-9007 J9 PHYS REV LETT JI Phys. Rev. Lett. PD FEB 17 PY 1992 VL 68 IS 7 BP 1085 EP 1088 DI 10.1103/PhysRevLett.68.1085 PG 4 WC Physics, Multidisciplinary SC Physics GA HE195 UT WOS:A1992HE19500048 ER PT J AU GRATE, JW WENZEL, SW WHITE, RM AF GRATE, JW WENZEL, SW WHITE, RM TI FREQUENCY-INDEPENDENT AND FREQUENCY-DEPENDENT POLYMER TRANSITIONS OBSERVED ON FLEXURAL PLATE WAVE ULTRASONIC SENSORS SO ANALYTICAL CHEMISTRY LA English DT Article ID CHEMICAL-ANALYSIS; SURFACE; DEVICES; OSCILLATOR; PROBE AB The flexural plate wave device is capable of sensing transition behaviors of homogeneous amorphous polymers applied as thin films to its surface. The changes in polymer properties at the static glass transition temperature are sensed as a change in slope of the frequency-temperature plot. Frequency-dependent relaxation properties are detected with a sigmoidal change in slope of the frequency-temperature plot and a minimum in signal amplitude. The transitions observed using poly(vinyl acetate), poly(tert-butyl acrylate), poly(isobutylene), and poly(vinyl propionate) are correlated with the properties of these polymers known by independent methods. The responses of the flexural plate wave device at 5 MHz are in accord with the results of conventional bulk-wave ultrasonic experiments at similar frequencies. The relevance of polymer transition processes to the performance of polymer-coated acoustic vapor sensors is discussed. C1 UNIV CALIF BERKELEY, BERKELEY SENSOR & ACTUATOR CTR, DEPT ELECT ENGN & COMP SCI, BERKELEY, CA 94720 USA. UNIV CALIF BERKELEY, ELECTR RES LAB, BERKELEY, CA 94720 USA. RP USN, RES LAB, DIV CHEM, WASHINGTON, DC 20375 USA. NR 46 TC 17 Z9 18 U1 0 U2 5 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0003-2700 EI 1520-6882 J9 ANAL CHEM JI Anal. Chem. PD FEB 15 PY 1992 VL 64 IS 4 BP 413 EP 423 DI 10.1021/ac00028a016 PG 11 WC Chemistry, Analytical SC Chemistry GA HE081 UT WOS:A1992HE08100016 ER PT J AU ADVANI, R SORENSON, S SHINAR, E LANDE, W RACHMILEWITZ, E SCHRIER, SL AF ADVANI, R SORENSON, S SHINAR, E LANDE, W RACHMILEWITZ, E SCHRIER, SL TI CHARACTERIZATION AND COMPARISON OF THE RED-BLOOD-CELL MEMBRANE DAMAGE IN SEVERE HUMAN ALPHA-THALASSEMIA AND BETA-THALASSEMIA SO BLOOD LA English DT Article ID ERYTHROCYTE-MEMBRANES; ASSOCIATION; SKELETON C1 STANFORD UNIV,MED CTR,SCH MED,DEPT HEMATOL,DIV HEMATOL,S-161,300 PASTEUR DR,STANFORD,CA 94305. HADASSAH MED CTR,JERUSALEM,ISRAEL. USN HOSP,DEPT PEDIAT HEMATOL,SAN DIEGO,CA 92134. FU NIDDK NIH HHS [R01 DK 13682] NR 18 TC 93 Z9 94 U1 0 U2 1 PU W B SAUNDERS CO PI PHILADELPHIA PA INDEPENDENCE SQUARE WEST CURTIS CENTER, STE 300, PHILADELPHIA, PA 19106-3399 SN 0006-4971 J9 BLOOD JI Blood PD FEB 15 PY 1992 VL 79 IS 4 BP 1058 EP 1063 PG 6 WC Hematology SC Hematology GA HD660 UT WOS:A1992HD66000031 PM 1737089 ER PT J AU EFTIS, J NEMES, JA AF EFTIS, J NEMES, JA TI MODELING OF IMPACT-INDUCED SPALL FRACTURE AND POST SPALL BEHAVIOR OF A CIRCULAR PLATE SO INTERNATIONAL JOURNAL OF FRACTURE LA English DT Article ID DYNAMIC FRACTURE; METALS; SOLIDS AB The ductile spall fracture and post-spall behavior of a circular target plate after impact with a flyer plate having small diameter, is modeled by means of a viscoplastic constitutive theory that includes the microvoid volume fraction as a scalar material damage variable. Incorporation of the damage parameter permits description of rate-dependent, hardening, compressible inelastic deformation and ductile fracture, where local fracture is defined in terms of a critical microvoid volume fraction. Multidimensional axisymmetric strains are developed where, because of the edge effect of the smaller flyer plate, nonplanar as well as planar waves are generated. Numerical simulations demonstrate the destructive effect of increasing the velocity of impact. They also illustrate the influence of varying the viscosity parameter associated with the microvoid growth on the development of damage. The change in location of the spall fracture caused by reduction of the flyer plate thickness is shown, as is the fragmented behaviour of the target up to 50-mu-s after initiation of the spall fracture. C1 USN,RES LAB,MECH MAT BRANCH,WASHINGTON,DC 20375. USN,RES LAB,DIV MAT SCI & TECHNOL,WASHINGTON,DC 20375. RP EFTIS, J (reprint author), GEORGE WASHINGTON UNIV,DEPT CIVIL MECH & ENVIRONM ENGN,WASHINGTON,DC 20052, USA. NR 28 TC 9 Z9 11 U1 0 U2 1 PU KLUWER ACADEMIC PUBL PI DORDRECHT PA SPUIBOULEVARD 50, PO BOX 17, 3300 AA DORDRECHT, NETHERLANDS SN 0376-9429 J9 INT J FRACTURE JI Int. J. Fract. PD FEB 15 PY 1992 VL 53 IS 4 BP 301 EP 324 DI 10.1007/BF00034179 PG 24 WC Materials Science, Multidisciplinary; Mechanics SC Materials Science; Mechanics GA HL504 UT WOS:A1992HL50400001 ER PT J AU CUKAUSKAS, EJ ALLEN, LH HOLM, RT SHERRILL, GK VANDAMME, PK AF CUKAUSKAS, EJ ALLEN, LH HOLM, RT SHERRILL, GK VANDAMME, PK TI PHOTORESPONSE OF SHALLOW STEP, WEAK-LINK BRIDGES USING INVERTED CYLINDRICAL MAGNETRON-SPUTTERED Y1BA2CU3O7-X THIN-FILMS SO JOURNAL OF APPLIED PHYSICS LA English DT Article ID OPTICAL-RESPONSE AB The photoresponse of Y1Ba2Cu3O7-x step, weak-link devices on MgO substrates has been measured using a He-Ne laser light source. The temperature and magnetic-field dependencies of the device critical current density were investigated. Single-step and multistep devices were fabricated and found to have a bolometric response in the resistive region and weak-link, video-detection response in the superconducting region. These devices are suitable for operation over a wide range of temperatures from 4 to 90 K. Responsivities greater than 1000 V/W were measured at low temperature for some devices. C1 SACHS FREEMAN INC,LANDOVER,MD 20785. RP CUKAUSKAS, EJ (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 21 TC 7 Z9 7 U1 0 U2 0 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0021-8979 J9 J APPL PHYS JI J. Appl. Phys. PD FEB 15 PY 1992 VL 71 IS 4 BP 1878 EP 1884 DI 10.1063/1.351173 PG 7 WC Physics, Applied SC Physics GA HE698 UT WOS:A1992HE69800046 ER PT J AU JOHNSON, DR THOMPSON, JD HAWKINS, JD AF JOHNSON, DR THOMPSON, JD HAWKINS, JD TI CIRCULATION IN THE GULF OF MEXICO FROM GEOSAT ALTIMETRY DURING 1985-1986 SO JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS LA English DT Article ID SATELLITE ALTIMETRY; VARIABILITY; TOPOGRAPHY; CURRENTS; PACIFIC; SEASAT; RING AB Using altimetry data obtained from the Geosat Geodetic Mission (April 1985 to October 1986), low-frequency sea surface height (SSH) variations are investigated in the Gulf of Mexico. SSH time series are formed using the method of Fu and Chelton and are used to calculate surface geostrophic current vectors. Spatial patterns of SSH and current vector variations enable the tracking of two major rings shed from the Loop Current. The rings drifted southwestward across the gulf and into the western boundary region at an average speed of about 3.4 cm/s. The buildup of the Loop Current was monitored, as well as the appearance of an eddy of uncertain origin in the southwestern gulf. Verification of the Geosat results are provided with surface drifers, AVHRR imagery, and hydrography. RP JOHNSON, DR (reprint author), USN,OCEANOG & ATMOSPHER RES LAB,DIV OCEAN SENSING & PREDICT,STENNIS SPACE CTR,MS 39529, USA. NR 22 TC 16 Z9 16 U1 0 U2 0 PU AMER GEOPHYSICAL UNION PI WASHINGTON PA 2000 FLORIDA AVE NW, WASHINGTON, DC 20009 SN 0148-0227 J9 J GEOPHYS RES-OCEANS JI J. Geophys. Res.-Oceans PD FEB 15 PY 1992 VL 97 IS C2 BP 2201 EP 2214 DI 10.1029/90JC02400 PG 14 WC Oceanography SC Oceanography GA HE091 UT WOS:A1992HE09100006 ER PT J AU MARMORINO, GO TRUMP, CL AF MARMORINO, GO TRUMP, CL TI HIGH-WAVE-NUMBER SHEAR AND TEMPERATURE STRUCTURE DURING THE PATCHES EXPERIMENT SO JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS LA English DT Article ID NEUTRALLY BUOYANT FLOAT; INTERNAL WAVE FIELD; SEASONAL THERMOCLINE; MIDDLE ATMOSPHERE; FINE-STRUCTURE; DISSIPATION; BREAKING; LAYER; OCEAN; SCALE AB Acoustic Doppler current profiler (ADCP) measurements made during the Patches Experiment (PATCHEX) in the Pacific Ocean are examined for the occurrence of high-wavenumber shear (vertical scales of > 2 m) which is presumed to lead to patches of small-scale waves and turbulent mixing. Shear is found to be dominated by near-inertial waves having upward energy propagation and approximately 30-m vertical wavelengths over the depth range approximately 80-180 m. The predominance of upgoing waves is unexpected and supports the RiNo float measurements made by Kunze et al. (1990a) at 180 to 200-m depth. Profiles of rms shear are qualitatively similar to those measured by Gregg and Sanford (1988) with the multi-scale profiler (MSP); and the fraction of time shear exceeds a threshold based on Gregg's (1989) scaling is about 10%, similar to the fraction of active turbulence seen in MSP profiles of dissipation rate. Towed thermistor chain data show infrequent patches of short (approximately 15 m) waveforms which may be Kelvin-Helmholtz shear instabilities (as assumed by Kunze et al.). The data support previous suggestions that near-inertial waves are important sources of turbulent mixing in the thermocline. RP MARMORINO, GO (reprint author), USN,RES LAB,ATMOSPHERE OCEAN SENSING BRANCH CODE 4220,WASHINGTON,DC 20375, USA. NR 34 TC 1 Z9 1 U1 0 U2 0 PU AMER GEOPHYSICAL UNION PI WASHINGTON PA 2000 FLORIDA AVE NW, WASHINGTON, DC 20009 SN 0148-0227 J9 J GEOPHYS RES-OCEANS JI J. Geophys. Res.-Oceans PD FEB 15 PY 1992 VL 97 IS C2 BP 2309 EP 2318 DI 10.1029/91JC02855 PG 10 WC Oceanography SC Oceanography GA HE091 UT WOS:A1992HE09100014 ER PT J AU TUCKER, JE MASTERS, MF WEXLER, BL SEARLES, SK AF TUCKER, JE MASTERS, MF WEXLER, BL SEARLES, SK TI AR2 EXCIMER EMISSION FROM A PULSED-DISCHARGE-EXCITED PULSED SUPERSONIC GAS-JET SO OPTICS LETTERS LA English DT Article ID ULTRAVIOLET; STATES; ARGON AB We report what is to our knowledge the first observation of argon excimer fluorescence between 115 and 140 nm in a pulsed supersonically cooled gas jet after pulsed-discharge excitation. The emission is observed for measured pressures at the supersonic orifice greater than 3 atm. RP TUCKER, JE (reprint author), USN,RES LAB,LASER PHYS BRANCH,WASHINGTON,DC 20375, USA. NR 9 TC 21 Z9 21 U1 0 U2 0 PU OPTICAL SOC AMER PI WASHINGTON PA 2010 MASSACHUSETTS AVE NW, WASHINGTON, DC 20036 SN 0146-9592 J9 OPT LETT JI Opt. Lett. PD FEB 15 PY 1992 VL 17 IS 4 BP 288 EP 290 DI 10.1364/OL.17.000288 PG 3 WC Optics SC Optics GA HD420 UT WOS:A1992HD42000021 PM 19784304 ER PT J AU COLOMBANT, DG LAU, YY AF COLOMBANT, DG LAU, YY TI MAXIMUM MICROWAVE CONVERSION EFFICIENCY FROM A MODULATED INTENSE RELATIVISTIC ELECTRON-BEAM SO PHYSICAL REVIEW A LA English DT Note ID POWER AB We calculate the power transfer from an intense modulated electron beam to an external load. The simple model fully incorporates various effects such as nonlinear beam loading, finite transit time, ac and dc space charges, and the beam's initial velocity modulation. We show that a fully modulated beam may deliver up to a maximum of 57% of its power to a load without forming a virtual cathode. RP COLOMBANT, DG (reprint author), USN,RES LAB,DIV PLASMA PHYS,BEAM PHYS BRANCH,WASHINGTON,DC 20375, USA. NR 14 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 1050-2947 J9 PHYS REV A JI Phys. Rev. A PD FEB 15 PY 1992 VL 45 IS 4 BP R2179 EP R2182 PG 4 WC Optics; Physics, Atomic, Molecular & Chemical SC Optics; Physics GA HE481 UT WOS:A1992HE48100010 ER PT J AU MAK, CL SOORYAKUMAR, R JONKER, BT PRINZ, GA AF MAK, CL SOORYAKUMAR, R JONKER, BT PRINZ, GA TI VIBRATIONAL-MODES IN ZN1-XFEXSE AND ZN1-XCOXSE SO PHYSICAL REVIEW B LA English DT Article ID MIXED-CRYSTALS; RAMAN-SCATTERING; PHONONS; SEMICONDUCTORS; ZN1-XMNXTE AB We report on a Raman study of lattice vibrations in the diluted magnetic semiconductors Zn1-xFexSe (0 < x < 0.64) and Zn1-xCoxSe (0 < x < 0.10). Both alloys possess a homogeneous crystal phase having the zinc-blende structure. The observed dependence of the first-order optical-phonon spectrum of x follows the mixed-mode behavior and is well described by the modified random-element isodisplacement model. Several physical parameters for the end members, cubic FeSe and CoSe, ard deduced from the fits to the composition dependence of the lattice vibrations. C1 USN,RES LAB,WASHINGTON,DC 20375. RP MAK, CL (reprint author), OHIO STATE UNIV,DEPT PHYS,COLUMBUS,OH 43210, USA. RI Mak, Chee Leung/D-4906-2016 OI Mak, Chee Leung/0000-0002-2992-7884 NR 17 TC 26 Z9 26 U1 2 U2 6 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD FEB 15 PY 1992 VL 45 IS 7 BP 3344 EP 3348 DI 10.1103/PhysRevB.45.3344 PG 5 WC Physics, Condensed Matter SC Physics GA HE854 UT WOS:A1992HE85400022 ER PT J AU HAMMOND, MS DUNNING, FB WALTERS, GK PRINZ, GA AF HAMMOND, MS DUNNING, FB WALTERS, GK PRINZ, GA TI SPIN DEPENDENCE IN HE(23S) METASTABLE-ATOM DEEXCITATION AT MAGNETIZED FE(110) AND O/FE(110) SURFACES SO PHYSICAL REVIEW B LA English DT Article ID EXCITED SECONDARY ELECTRONS; POLARIZED ELECTRONS; SPECTROSCOPY; FERROMAGNETS; OXYGEN; PHOTOEMISSION; ADSORPTION; SCATTERING; EMISSION; FE(001) AB Spin-labeling techniques, specifically the use of electron-spin-polarized He(2(3)S) metastable atoms coupled with analysis of the number and spin of the ejected electrons, are used to investigate the dynamics of metastable-atom-surface interactions and the properties of (magnetized) Fe(110) and O/Fe(110) surfaces. The data show that the dominant He(2(3)S) metastable-atom deexcitation mechanism at such surfaces is resonance ionization followed by Auger neutralization, and that the ejected-electron polarization reflects the iron conduction-band polarization. The present results, when interpreted using the theory of Penn and Apell, also indicate that the magnetization in the vacuum above a clean Fe(110) surface at distances (approximately 3-5 angstrom) where Auger neutralization occurs is negative but changes sign upon exposure to oxygen. Several possible explanations for this sign reversal are discussed. The measurements establish spin-polarized metastable-atom deexcitation spectroscopy as an extraordinarily sensitive probe of the surface magnetic environment. C1 RICE UNIV,DEPT PHYS,HOUSTON,TX 77251. RICE UNIV,RICE QUANTUM INST,HOUSTON,TX 77251. USN,RES LAB,WASHINGTON,DC 20375. NR 26 TC 68 Z9 68 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 1992 VL 45 IS 7 BP 3674 EP 3679 DI 10.1103/PhysRevB.45.3674 PG 6 WC Physics, Condensed Matter SC Physics GA HE854 UT WOS:A1992HE85400065 ER PT J AU PAPACONSTANTOPOULOS, DA PICKETT, WE AF PAPACONSTANTOPOULOS, DA PICKETT, WE TI TERNARY NITRIDES BINCA3 AND PBNCA3 - UNUSUAL IONIC BONDING IN THE ANTIPEROVSKITE STRUCTURE SO PHYSICAL REVIEW B LA English DT Article AB The compounds BiNCa3 and PbNCa3, a narrow-gap semiconductor and a metal, respectively, with the antiperovskite structure, are investigated with the local-density augmented-plane-wave method. The calculations confirm that both N and the heavy ions Bi and Pb are close to the nominal 3- charge states of an ionic picture; however, there is considerable covalent mixing between the two sets of p states. The filled p bands of the BiNCa3 compound are separated from the conductions bands, with a calcualated gap of approximately 0.1 eV consistent with its semiconducting behavior. PbNCa3, with one less electron per cell and therefore an unfilled p band, is predicted correctly to be metallic, consistent with a rigid-band picture. RP PAPACONSTANTOPOULOS, DA (reprint author), USN,RES LAB,COMPLEX SYST THEORY BRANCH,WASHINGTON,DC 20375, USA. NR 9 TC 32 Z9 32 U1 0 U2 8 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD FEB 15 PY 1992 VL 45 IS 8 BP 4008 EP 4012 DI 10.1103/PhysRevB.45.4008 PG 5 WC Physics, Condensed Matter SC Physics GA HF828 UT WOS:A1992HF82800008 ER PT J AU ROBINSON, KM ROBINSON, IK OGRADY, WE AF ROBINSON, KM ROBINSON, IK OGRADY, WE TI STRUCTURE OF AU(100) AND AU(111) SINGLE-CRYSTALS SURFACES PREPARED BY FLAME ANNEALING SO SURFACE SCIENCE LA English DT Article ID ELECTROCHEMICAL-CELL; GOLD SURFACES; DIFFRACTION; REDUCTION; KINETICS AB The surfaces of flame annealed Au(111) and Au(100) single crystals have been investigated by synchrotron X-ray diffraction and reflectivity. Electropolished crystals were flame annealed for various lengths of time and studied for structural changes. Electropolishing of the Au(111) and Au(100) crystals produced smooth surfaces with no evidence for reconstructions. Upon flame annealing the Au(111) was slightly roughened, possibly due to stacking fault growth at the surface, while the Au(100) was smoothed with evidence for the hexagonal reconstruction. C1 AT&T BELL LABS,MURRAY HILL,NJ 07974. RP ROBINSON, KM (reprint author), USN,RES LAB,DIV CHEM,CODE 6170,WASHINGTON,DC 20375, USA. NR 20 TC 24 Z9 24 U1 3 U2 18 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0039-6028 J9 SURF SCI JI Surf. Sci. PD FEB 15 PY 1992 VL 262 IS 3 BP 387 EP 394 DI 10.1016/0039-6028(92)90135-S PG 8 WC Chemistry, Physical; Physics, Condensed Matter SC Chemistry; Physics GA HE395 UT WOS:A1992HE39500022 ER PT J AU GARRISON, BJ DAWNKASKI, EJ SRIVASTAVA, D BRENNER, DW AF GARRISON, BJ DAWNKASKI, EJ SRIVASTAVA, D BRENNER, DW TI MOLECULAR-DYNAMICS SIMULATIONS OF DIMER OPENING ON A DIAMOND (001)(2X1) SURFACE SO SCIENCE LA English DT Article ID GROWTH-MECHANISM; EPITAXIAL-GROWTH; HYDROCARBONS; SILICON; ENERGY AB Computer simulations of hydrocarbon and related molecules using empirical force fields have become important tools for studying a number of biological and related processes at the atomic scale. Traditional force fields, however, cannot be used to simulate dynamic chemical reactivity that involves changes in atomic hybridization. Application of a many-body potential function allows such reactivity to occur in a computer simulation. Simulations of the reaction of small hydrocarbon molecules adsorbed on a reconstructed diamond {001}(2 x 1) surface suggest that these hydrocarbons are highly reactive species and that initial stages of diamond growth proceed through a dimer-opening mechanism. Rates estimated from transition state theory of two interconversions between states where the dimer is open and closed are given. C1 USN,RES LAB,WASHINGTON,DC 20375. RP GARRISON, BJ (reprint author), PENN STATE UNIV,DEPT CHEM,152 DAVEY LAB,UNIV PK,PA 16802, USA. RI Brenner, Donald/D-1741-2009 NR 33 TC 177 Z9 179 U1 1 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 FEB 14 PY 1992 VL 255 IS 5046 BP 835 EP 838 DI 10.1126/science.255.5046.835 PG 4 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA HD548 UT WOS:A1992HD54800033 PM 17756431 ER PT J AU KERSEY, AD DANDRIDGE, A DAVIS, MA AF KERSEY, AD DANDRIDGE, A DAVIS, MA TI LOW-CROSSTALK CODE-DIVISION MULTIPLEXED INTERFEROMETRIC ARRAY SO ELECTRONICS LETTERS LA English DT Article DE OPTICAL FIBERS; OPTICAL SENSORS; MULTIPLEXING AB The results obtained using code-division multiplexing with an array of eight sensors are reported. lt is demonstrated that crosstalk levels approximately -60dB can be achieved using this approach using return-to-zero pulse coding. RP KERSEY, AD (reprint author), USN,RES LAB,DIV OPT SCI,WASHINGTON,DC 20375, USA. NR 6 TC 19 Z9 19 U1 0 U2 1 PU IEE-INST ELEC ENG PI HERTFORD PA MICHAEL FARADAY HOUSE SIX HILLS WAY STEVENAGE, HERTFORD, ENGLAND SG1 2AY SN 0013-5194 J9 ELECTRON LETT JI Electron. Lett. PD FEB 13 PY 1992 VL 28 IS 4 BP 351 EP 352 DI 10.1049/el:19920219 PG 2 WC Engineering, Electrical & Electronic SC Engineering GA HE563 UT WOS:A1992HE56300007 ER PT J AU RICHTER, DA TUMMALA, M AF RICHTER, DA TUMMALA, M TI ITERATIVE SYSTEM-IDENTIFICATION USING MULTIGRID TECHNIQUES SO ELECTRONICS LETTERS LA English DT Article DE SIGNAL PROCESSING; MATHEMATICAL TECHNIQUES AB A new system identification algorithm utilizing multigrid techniques is presented. System identification algorithms based on iterative techniques are enhanced and made more efficient using the multigrid methods. The reduction in the number of iterations required to converge to a solution is realised by forcing the low frequency error components to appear to be at a higher frequency by transferring to a coarser sampling period. Finite impulse response (FIR) system identification simulations with and without the multigrid techniques employed are presented. RP RICHTER, DA (reprint author), NAVAL POST GRAD SCH,DEPT ELECT & COMP ENGN,CODE EC-TU,MONTEREY,CA 93943, USA. NR 4 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 13 PY 1992 VL 28 IS 4 BP 433 EP 434 DI 10.1049/el:19920272 PG 2 WC Engineering, Electrical & Electronic SC Engineering GA HE563 UT WOS:A1992HE56300060 ER PT J AU RICO, RJ PAGE, M DOUBLEDAY, C AF RICO, RJ PAGE, M DOUBLEDAY, C TI STRUCTURE OF THE TRANSITION-STATE FOR HYDROGEN MOLECULE ELIMINATION FROM 1,4-CYCLOHEXADIENE SO JOURNAL OF THE AMERICAN CHEMICAL SOCIETY LA English DT Article ID CONFORMATIONS; ENERGIES AB Reactant, product, and transition-state regions of the potential energy surface for the dissociation of 1,4-cyclohexadiene (1,4-CHDN) to benzene and H-2 have been studied by using ab initio multiconfiguration self-consistent field (MCSCF) wave functions with STO-3G, 6-31G, and 6-31G** basis sets. At all computed levels of theory, the carbon framework of the reactant 1,4-CHDN is planar, and the transition state has a C2-upsilon-symmetry boat-like conformation. The transition state is fairly light and is centrally located; the C-H and H-H distances are each extended by about 35-40% from their respective equilibrium values in 1,4-CHDN and H-2. At the best level of theory, the computed values for the activation barrier and reaction exothermicity for H-2 elimination are 60.1 and 9.3 kcal/mol, respectively, compared to an experimental activation energy of 43.8 and an exothermicity of 6.5 kcal/mol. C1 USN,RES LAB,COMPUTAT PHYS & FLUID DYNAM LAB,WASHINGTON,DC 20375. COLUMBIA UNIV,DEPT CHEM,NEW YORK,NY 10027. NR 28 TC 12 Z9 12 U1 0 U2 1 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0002-7863 J9 J AM CHEM SOC JI J. Am. Chem. Soc. PD FEB 12 PY 1992 VL 114 IS 4 BP 1131 EP 1136 DI 10.1021/ja00030a001 PG 6 WC Chemistry, Multidisciplinary SC Chemistry GA HD978 UT WOS:A1992HD97800001 ER PT J AU CLEGG, AW CORDES, JM SIMONETTI, JH KULKARNI, SR AF CLEGG, AW CORDES, JM SIMONETTI, JH KULKARNI, SR TI ROTATION MEASURES OF LOW-LATITUDE EXTRAGALACTIC SOURCES AND THE MAGNETOIONIC STRUCTURE OF THE GALAXY SO ASTROPHYSICAL JOURNAL LA English DT Article DE GALAXY, GENERAL; ISM, MAGNETIC FIELDS; POLARIZATION; RADIO CONTINUUM, GALAXIES ID GALACTIC MAGNETIC-FIELD; SMALL-SCALE VARIATIONS; FARADAY-ROTATION; RADIO-SOURCES; INTERSTELLAR PLASMA; EMISSION AB We have obtained Faraday rotation measurements of 56 extragalactic sources predominantly in the range 45-degrees < l < 93-degrees, \b\ < 5-degrees. The data complement the few rotation measures (RMs) that have been published for low-latitude extragalactic sources, and are used to probe the Galactic magnetic field and electron density to great distances. Within the longitude range sampled here, we find RM(l) = 1600 sin (l0 - l) rad m-2, with a null in RM occurring at l0 = 62-degrees. Under the assumption of a uniform circular geometry for the magnetic field lines, the magnetoionic medium must exist to a Galactocentric radius R(m) congruent-to 25 kpc to produce the observed magnitudes of the RMs, where we have assumed that n(e) and \B\ equal their local values of 0.03 cm-3 and 2.1-mu-G out to R(m). The medium must exist to an even greater radius if n(e) and/or \B\ decrease with R, as is likely. The null in RM at l0 confirms that a field reversal occurs interior to R0 (the radius of the solar orbit about the Galactic center) and requires that the product quantity n(e)\B\ be greater inside the field-reversed region than in the local ISM. Comparison of extragalactic and pulsar RMs along nearly coincident lines of sight is consistent with at least one field reversal exterior to R0. An anomalous RM contribution of greater-than-or-similar-to 1000 rad m-2 is found at l = 92-degrees, b = 0-degrees, with an angular size of approximately 1-degrees-8-degrees. The phenomenon is akin to enhanced RMs observed behind the Cygnus region. The majority of our sources are components of double-lobed objects with lobe separations of 30"-200". This allows us to study variations in Galactic Faraday rotation over small angular scales. The differences exceed those expected from a large-scale ordered field by more than two orders of magnitude. The implied linear scales for fluctuations in the magnetoionic medium are approximately 0.1-10 pc. We are able to explain the small-scale variations in RM solely in terms of previously observed electron density turbulence in the interstellar medium. C1 CORNELL UNIV,DEPT ASTRON,ITHACA,NY 14853. VIRGINIA POLYTECH INST & STATE UNIV,DEPT PHYS,BLACKSBURG,VA 24061. CALTECH,DIV PHYS MATH & ASTRON,PASADENA,CA 91125. RP CLEGG, AW (reprint author), USN,RES LAB,CODE 4213,WASHINGTON,DC 20375, USA. NR 35 TC 85 Z9 85 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 FEB 10 PY 1992 VL 386 IS 1 BP 143 EP 157 DI 10.1086/171000 PN 1 PG 15 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA HC501 UT WOS:A1992HC50100016 ER PT J AU LAMING, JM FELDMAN, U AF LAMING, JM FELDMAN, U TI A BURST MODEL FOR LINE EMISSION IN THE SOLAR ATMOSPHERE .1. XUV LINES OF HE-I AND HE-II IN IMPULSIVE FLARES SO ASTROPHYSICAL JOURNAL LA English DT Article DE SUN, CHROMOSPHERE; SUN, FLARES; ULTRAVIOLET, SOLAR SYSTEM ID ELECTRON-EXCITATION; EXTREME-ULTRAVIOLET; HELIUM; SPECTRUM; COEFFICIENTS; CHROMOSPHERE; IONIZATION; CORONA; IONS; SUN AB A model in which the solar chromosphere is heated by explosive events is developed and used to interpret XUV spectra of He I and He II in impulsive flares observed by the Skylab spectroheliograph. From a comparison of relative line intensities from He I and He II emitted within the flares, the model establishes sizes, durations, and frequencies for the individual events and, by comparison with lines from other elements observed in the same flares, is demonstrated to be consistent with a helium abundance relative to hydrogen of 0.1 for burst temperatures of 15-18 eV. C1 SFA INC, LANDOVER, MD 20785 USA. RP USN, RES LAB, EO HULBURT CTR SPACE RES, WASHINGTON, DC 20375 USA. NR 44 TC 33 Z9 33 U1 0 U2 0 PU IOP PUBLISHING LTD PI BRISTOL PA TEMPLE CIRCUS, TEMPLE WAY, BRISTOL BS1 6BE, ENGLAND SN 0004-637X EI 1538-4357 J9 ASTROPHYS J JI Astrophys. J. PD FEB 10 PY 1992 VL 386 IS 1 BP 364 EP 370 DI 10.1086/171023 PN 1 PG 7 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA HC501 UT WOS:A1992HC50100039 ER PT J AU KEENAN, FP CONLON, ES HARRA, LK WIDING, KG AF KEENAN, FP CONLON, ES HARRA, LK WIDING, KG TI MG-IX LINE RATIOS IN THE SUN SO ASTROPHYSICAL JOURNAL LA English DT Article DE ATOMIC DATA; ATOMIC PROCESSES; SUN, FLARES; ULTRAVIOLET, SOLAR SYSTEM ID ELECTRON-IMPACT-EXCITATION; FINE-STRUCTURE TRANSITIONS; BE-LIKE IONS; SOLAR-FLARES; C-III; COLLISION STRENGTHS; DENSITY DIAGNOSTICS; NE-VII; S-XIII; AR-XV AB Theoretical Mg IX electron density sensitive emission-line ratios, derived using electron impact excitation rates interpolated from accurate R-matrix calculations, are presented for R1 = I(443.97 angstrom)/(368.07 angstrom), R2 = I(439.17 angstrom)/I(368.07 angstrom), R3 = I(368.07 angstrom)/I(443.07 angstrom), and R4 = I(441.20 angstrom)/I(368.07 angstrom). A comparison of these with observational data for solar flares, obtained with the Naval Research Laboratory's S082A spectrograph on board Skylab, reveals excellent agreement between theory and observation for R1 and R2, which confirms the usefulness of these ratios as N(e)-diagnostics for solar flares, as well as providing experimental support for the accuracy of the atomic data adopted in the line ratio calculations. However the observed values of both R3 and R4 generally imply unrealistically high electron densities, which is probably due to blending in the 443.40 and 441.20 angstrom lines, probably with Ar IV 443.44 angstrom and Mg VI/Mg VII 441.22 angstrom, respectively. C1 USN, RES LAB, EO HULBURT CTR SPACE RES, WASHINGTON, DC 20375 USA. RP QUEENS UNIV BELFAST, DEPT PURE & APPL PHYS, BELFAST BT7 1NN, ANTRIM, NORTH IRELAND. OI Harra, Louise/0000-0001-9457-6200 NR 45 TC 7 Z9 7 U1 0 U2 0 PU IOP PUBLISHING LTD PI BRISTOL PA TEMPLE CIRCUS, TEMPLE WAY, BRISTOL BS1 6BE, ENGLAND SN 0004-637X EI 1538-4357 J9 ASTROPHYS J JI Astrophys. J. PD FEB 10 PY 1992 VL 386 IS 1 BP 371 EP 374 DI 10.1086/171024 PN 1 PG 4 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA HC501 UT WOS:A1992HC50100040 ER PT J AU PORTER, JL SPIELMAN, RB MATZEN, MK MCGUIRE, EJ RUGGLES, LE VARGAS, MF APRUZESE, JP CLARK, RW DAVIS, J AF PORTER, JL SPIELMAN, RB MATZEN, MK MCGUIRE, EJ RUGGLES, LE VARGAS, MF APRUZESE, JP CLARK, RW DAVIS, J TI DEMONSTRATION OF POPULATION-INVERSION BY RESONANT PHOTOPUMPING IN A NEON GAS CELL IRRADIATED BY A SODIUM Z-PINCH SO PHYSICAL REVIEW LETTERS LA English DT Article ID X-RAY LASER AB The broadband radiation emitted from a Na Z pinch is used to photoionize Ne to the He-like ground state and radiation from the Na 1s2-1 s2-1 s 2p P-1(1) transition is used to resonantly photoexcite the Ne 1s2-1s4p P-1(1) transition. Time-resolved and time-integrated spectral measurements of the Ne K-shell emission demonstrate the first population inversion driven by a Z pinch. This is the first experiment in any medium to demonstrate a soft-x-ray inversion pumped solely by resonant photoexcitation. C1 USN,RES LAB,WASHINGTON,DC 20375. RP PORTER, JL (reprint author), SANDIA NATL LABS,ALBUQUERQUE,NM 87185, USA. NR 16 TC 53 Z9 53 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 10 PY 1992 VL 68 IS 6 BP 796 EP 799 DI 10.1103/PhysRevLett.68.796 PG 4 WC Physics, Multidisciplinary SC Physics GA HC505 UT WOS:A1992HC50500020 ER PT J AU ORAN, ES JONES, DA SICHEL, M AF ORAN, ES JONES, DA SICHEL, M TI NUMERICAL SIMULATIONS OF DETONATION TRANSMISSION SO PROCEEDINGS OF THE ROYAL SOCIETY-MATHEMATICAL AND PHYSICAL SCIENCES LA English DT Article ID WAVES AB The complex, dynamic shock-detonation structure formed by the glancing interaction of a primary detonation with a secondary explosive is studied by using time-dependent two-dimensional simulations and related experiments. The materials considered in the simulations are stoichiometric and lean mixtures of hydrogen and oxygen diluted with argon. Related experiments have used undiluted hydrogen and oxygen as well as other gases. For the conditions simulated: (a) the primary mixture is stoichiometric and the secondary inert; (b) both the primary and secondary mixtures are the same and stoichiometric; (c) the primary mixture is lean and the secondary is stoichiometric; and (d) the primary mixture is stoichiometric and the secondary is lean. In addition, for cases (b) and (d), comparisons are made between simulations in which the primary mixture is overdriven and when it is a Chapman-Jouguet detonation. For the overdriven stoichiometric primary detonation interacting with the lean mixture, a complex detonation structure forms and quickly asymptotes to the detonation velocity of the primary mixture. For this same case, but when the primary detonation is initially at Chapman-Jouguet velocity, the detonation appears to die but then reignites due to a series of shock reflections and then propagates as a complex structure. The lowest velocity of the complex structure is always greater than the Chapman-Jouguet velocity of the lean mixture and it increases in time, appearing to approach the Chapman-Jouguet velocity of the stoichiometric mixture. The dynamics of this decay and reignition process are described and discussed in detail. C1 UNIV MICHIGAN, DEPT AEROSP ENGN, ANN ARBOR, MI 48109 USA. DEF SCI & TECHNOL ORG, MAT RES LAB, ASCOT, VIC 3032, AUSTRALIA. RP ORAN, ES (reprint author), USN, RES LAB, COMPUTAT PHYS & FLUID DYNAM LAB, CODE 4404, WASHINGTON, DC 20375 USA. NR 34 TC 26 Z9 28 U1 0 U2 5 PU ROYAL SOC PI LONDON PA 6-9 CARLTON HOUSE TERRACE, LONDON SW1Y 5AG, ENGLAND SN 0962-8444 J9 P R SOC-MATH PHYS SC JI P. Roy. Soc.-Math. Phys. Sci. PD FEB 8 PY 1992 VL 436 IS 1897 BP 267 EP 297 DI 10.1098/rspa.1992.0018 PG 31 GA HD396 UT WOS:A1992HD39600004 ER PT J AU PROKES, SM RAI, AK AF PROKES, SM RAI, AK TI SUBMICRON SI1-XGEX/SI EPITAXIAL STRUCTURE FORMATION BY WET OXIDATION OF AMORPHOUS SI-GE LAYERS SO APPLIED PHYSICS LETTERS LA English DT Article ID FILMS; SI(100); GROWTH AB Submicron buried epitaxial SixGe1-x structures have been formed by a wet oxidation process from amorphous SixGe1-x layers. Epitaxial features in the shape of buried "donut" regions as well as buried Ge-rich lines have been obtained by this method using initial particulate contaminants or patterned amorphous SiGe structures as the starting features. Oxide formation above the epitaxial structures has been examined, showing that the oxides formed in this process consisted of several layers, some containing both SiO2 and GeO2. The mechanism of formation is interpreted in terms of motion of both Si and Ge during the oxidation process. C1 UES INC,DAYTON,OH 45432. RP PROKES, SM (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 8 TC 9 Z9 9 U1 0 U2 0 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0003-6951 J9 APPL PHYS LETT JI Appl. Phys. Lett. PD FEB 3 PY 1992 VL 60 IS 5 BP 568 EP 570 DI 10.1063/1.106610 PG 3 WC Physics, Applied SC Physics GA HB582 UT WOS:A1992HB58200017 ER PT J AU FU, LP SCHMIEDEL, T PETROU, A WARNOCK, J JONKER, BT AF FU, LP SCHMIEDEL, T PETROU, A WARNOCK, J JONKER, BT TI FARADAY-ROTATION FROM ZN1-XFEXSE EPILAYERS SO APPLIED PHYSICS LETTERS LA English DT Article ID DILUTED MAGNETIC SEMICONDUCTORS; EXCHANGE INTERACTION; CD1-XMNXTE AB We present Faraday rotation measurements on Zn1-xFexSe films grown by molecular beam epitaxy. The samples exhibit giant Faraday rotation characteristic of diluted magnetic semiconductors. Measurements were carried out at T = 4.2 K and in magnetic fields up to 8 T. The Faraday rotation angle shows a strong resonance for photon energies close to the band gap. The resonance curves were fitted by a simple dielectric model using the exciton oscillator strength as a fitting parameter. C1 SUNY BUFFALO,CTR ELECTR & ELECTROOPT MAT,BUFFALO,NY 14260. IBM CORP,THOMAS J WATSON RES CTR,YORKTOWN HTS,NY 10598. USN,RES LAB,WASHINGTON,DC 20375. RP FU, LP (reprint author), SUNY BUFFALO,DEPT PHYS & ASTRON,BUFFALO,NY 14260, USA. NR 10 TC 11 Z9 15 U1 0 U2 1 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0003-6951 J9 APPL PHYS LETT JI Appl. Phys. Lett. PD FEB 3 PY 1992 VL 60 IS 5 BP 583 EP 585 DI 10.1063/1.106617 PG 3 WC Physics, Applied SC Physics GA HB582 UT WOS:A1992HB58200022 ER PT J AU MINTMIRE, JW DUNLAP, BI WHITE, CT AF MINTMIRE, JW DUNLAP, BI WHITE, CT TI ARE FULLERENE TUBULES METALLIC SO PHYSICAL REVIEW LETTERS LA English DT Article ID CARBON; C-60; POLYACETYLENE; FORM AB We have calculated the electronic structure of a fullerene tubule using a first-principles, self-consistent, all-electron Gaussian-orbital based local-density-functional approach. Extending these results to a model containing an electron-lattice interaction, we estimate that the mean-field transition temperature from a Peierls-distorted regime to a high-temperature metallic regime should be well below room temperature. Such fullerene tubules should have the advantages (compared to other conjugated carbon systems) of a carrier density similar to that of metals and zero band gap at room temperature. RP MINTMIRE, JW (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. OI Mintmire, John/0000-0002-6551-0349; Dunlap, Brett/0000-0003-1356-6559 NR 23 TC 1812 Z9 1845 U1 17 U2 112 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 3 PY 1992 VL 68 IS 5 BP 631 EP 634 DI 10.1103/PhysRevLett.68.631 PG 4 WC Physics, Multidisciplinary SC Physics GA HB528 UT WOS:A1992HB52800021 ER PT J AU LEKOUDIS, S AF LEKOUDIS, S TI CFD LENDS THE GOVERNMENT A HAND SO AEROSPACE AMERICA LA English DT Article RP LEKOUDIS, S (reprint author), OFF NAVAL RES,DIV MECH,ARLINGTON,VA 22217, USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER INST AERONAUT ASTRONAUT PI RESTON PA 1801 ALEXANDER BELL DRIVE, STE 500, RESTON, VA 22091 SN 0740-722X J9 AEROSPACE AM JI Aerosp. Am. PD FEB PY 1992 VL 30 IS 2 BP 18 EP 21 PG 4 WC Engineering, Aerospace SC Engineering GA HD315 UT WOS:A1992HD31500005 ER PT J AU FERRE, F MARCHESE, A DUFFY, PC LEWIS, DE WALLACE, MR BEECHAM, HJ BURNETT, KG JENSEN, FC CARLO, DJ AF FERRE, F MARCHESE, A DUFFY, PC LEWIS, DE WALLACE, MR BEECHAM, HJ BURNETT, KG JENSEN, FC CARLO, DJ TI QUANTITATION OF HIV VIRAL BURDEN BY PCR IN HIV SEROPOSITIVE NAVY PERSONNEL REPRESENTING WALTER REED STAGES 1 TO 6 SO AIDS RESEARCH AND HUMAN RETROVIRUSES LA English DT Article ID IMMUNODEFICIENCY-VIRUS TYPE-1; POLYMERASE CHAIN-REACTION; PERIPHERAL-BLOOD; INFECTED PERSONS; HOMOSEXUAL MEN; AMPLIFICATION; DNA; INVITRO; CELLS; ANTIBODIES AB To quantitate the amount of human immunodeficiency virus type 1 (HIV-1) DNA in peripheral blood mononuclear cells (PBMC) of 78 infected individuals, we have developed a polymerase chain reaction (PCR) assay that is both quantitative and sensitive. Quantitation was based on incorporation of a P-32 end-labelled primer (SK39) in the PCR reaction and on comparison after electrophoresis with known amounts of HIV DNA. A linear relationship was obtained between the natural logarithms of the radioactive counts detected and the number of HIV-1 DNA copies (10-1000 copies) from the standard DNA. HIV copy numbers from patient samples were then extrapolated from the standard curves. This sensitive and reproducible method was compared with virus isolation which is a semiquantitative evaluation of viral burden. HIV DNA levels correlated with virus isolation, i.e., high viral burden (100-1000 HIV copies) were found in most samples from which virus was isolated after only 7 days in culture; low viral burden (< 100 HIV copies) was observed in samples from which virus was isolated after 14 to 21 days in culture. These estimates of viral burden were then compared with the clinical stage of the individuals. C1 USN HOSP,SAN DIEGO,CA 92134. RP FERRE, F (reprint author), IMMUNE RESPONSE CORP,5935 DARWIN COURT,CARLSBAD,CA 92008, USA. NR 22 TC 36 Z9 36 U1 0 U2 2 PU MARY ANN LIEBERT INC PUBL PI LARCHMONT PA 2 MADISON AVENUE, LARCHMONT, NY 10538 SN 0889-2229 J9 AIDS RES HUM RETROV JI Aids Res. Hum. Retrovir. PD FEB PY 1992 VL 8 IS 2 BP 269 EP 275 DI 10.1089/aid.1992.8.269 PG 7 WC Immunology; Infectious Diseases; Virology SC Immunology; Infectious Diseases; Virology GA HG489 UT WOS:A1992HG48900020 PM 1540412 ER PT J AU LINNOILA, RI JENSEN, SM STEINBERG, SM MULSHINE, JL EGGLESTON, JC GAZDAR, AF AF LINNOILA, RI JENSEN, SM STEINBERG, SM MULSHINE, JL EGGLESTON, JC GAZDAR, AF TI PERIPHERAL AIRWAY CELL MARKER EXPRESSION IN NON-SMALL-CELL LUNG-CARCINOMA - ASSOCIATION WITH DISTINCT CLINICOPATHOLOGICAL FEATURES SO AMERICAN JOURNAL OF CLINICAL PATHOLOGY LA English DT Article DE LUNG CANCER; ADENOCARCINOMA; PAPILLOLEPIDIC; CLARA CELL; TYPE-II CELL; SURFACTANT; SMOKING ID PULMONARY SURFACTANT APOPROTEINS; BRONCHIOLO-ALVEOLAR CARCINOMA; CLARA CELL; MONOCLONAL-ANTIBODIES; CANCER; LOCALIZATION; PROTEIN; DIFFERENTIATION; ADENOCARCINOMAS; LINES AB Paraffin sections of 247 primary and metastatic non-small cell lung carcinomas, the corresponding non-neoplastic lungs, and 75 other specimens were examined by immunohistochemical procedures using a panel of antibodies against the specific products of peripheral airway cells: the major surfactant-associated protein and 10-kD Clara cell protein. Non-small cell lung carcinoma tumors most frequently positive for either peripheral airway cell marker were adenocarcinomas (41%), especially those with papillolepidic growth pattern (56%), followed by large cell carcinomas (25%), other adenocarcinomas (22%), and squamous cell carcinomas (16%). Immunoreactivity was mainly focal and the expression of the two peripheral airway cell markers was discordant. The incidence of marker expression was similar in metastatic and primary non-small cell lung carcinoma. Other organs and their tumors were negative, with few exceptions. Non-mall cell lung carcinomas positive for peripheral airway cell markers were associated with younger age and less-intense smoking, and surfactant-associated protein reactivity was more common in women than in men. Peripheral airway cell markers were independent prognostic factors for survival and delayed development of metastases in patients with less-advanced disease. It is concluded that surfactant-associated protein and 10-kD Clara cell protein are specific markers for non-small cell lung carcinoma and peripheral airway cell differentiation and provide useful tools to study the pathogenesis, biology, and prognosis of non-small cell lung carcinoma. C1 NCI,BIOSTAT & DATA MANAGEMENT SECT,BETHESDA,MD 20892. JOHNS HOPKINS UNIV HOSP,DEPT PATHOL,BALTIMORE,MD 21205. RP LINNOILA, RI (reprint author), USN HOSP,NCI,MED ONCOL BRANCH,NAVAL HOSP BLDG 8,ROOM 5101,BETHESDA,MD 20892, USA. NR 47 TC 93 Z9 93 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 FEB PY 1992 VL 97 IS 2 BP 233 EP 243 PG 11 WC Pathology SC Pathology GA HC499 UT WOS:A1992HC49900014 PM 1372146 ER PT J AU ZEHNA, PW AF ZEHNA, PW TI KRUSKAL PROOF OF THE JOINT DISTRIBUTION OF XBAR AND S2 - REPLY SO AMERICAN STATISTICIAN LA English DT Letter RP ZEHNA, PW (reprint author), USN,POSTGRAD SCH,DEPT OPERAT RES,MONTEREY,CA 93943, USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER STATISTICAL ASSOC PI ALEXANDRIA PA 1429 DUKE ST, ALEXANDRIA, VA 22314 SN 0003-1305 J9 AM STAT JI Am. Stat. PD FEB PY 1992 VL 46 IS 1 BP 73 EP 74 PG 2 WC Statistics & Probability SC Mathematics GA HB062 UT WOS:A1992HB06200022 ER PT J AU KUMATA, DS AF KUMATA, DS TI PROPOFOL AND MALIGNANT HYPERTHERMIA SO ANESTHESIA AND ANALGESIA LA English DT Letter RP KUMATA, DS (reprint author), NAVAL HOSP,DEPT ANESTHESIOL,OAK HARBOR,WA 98278, USA. NR 2 TC 1 Z9 1 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 1992 VL 74 IS 2 BP 318 EP 318 PG 1 WC Anesthesiology SC Anesthesiology GA HB064 UT WOS:A1992HB06400040 PM 1590832 ER PT J AU CALDER, TM HARRIS, AP AF CALDER, TM HARRIS, AP TI SUBDURAL BLOCK DURING ATTEMPTED CAUDAL EPIDURAL ANALGESIA FOR LABOR SO ANESTHESIOLOGY LA English DT Note DE ANESTHESIA; OBSTETRIC; ANESTHETIC TECHNIQUES; CAUDAL; COMPLICATIONS; SUBDURAL ID EXTENSIVE SPREAD; CATHETER; MIGRATION; SPACE C1 JOHNS HOPKINS UNIV,SCH MED,BALTIMORE,MD 21205. RP CALDER, TM (reprint author), USN,MED CTR,DEPT ANESTHESIA,WASHINGTON,DC 20350, USA. NR 10 TC 0 Z9 0 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 FEB PY 1992 VL 76 IS 2 BP 316 EP 318 DI 10.1097/00000542-199202000-00023 PG 3 WC Anesthesiology SC Anesthesiology GA HC458 UT WOS:A1992HC45800023 PM 1736709 ER PT J AU CLENDENNEN, TE HAMES, CS KEES, ES PRICE, FC RUEPPEL, WJ ANDRADA, AB ESPINOSA, GE KABRERRA, G WIGNALL, FS AF CLENDENNEN, TE HAMES, CS KEES, ES PRICE, FC RUEPPEL, WJ ANDRADA, AB ESPINOSA, GE KABRERRA, G WIGNALL, FS TI INVITRO ANTIBIOTIC SUSCEPTIBILITIES OF NEISSERIA-GONORRHOEAE ISOLATES IN THE PHILIPPINES SO ANTIMICROBIAL AGENTS AND CHEMOTHERAPY LA English DT Article ID PENICILLIN; RESISTANT; SPECTINOMYCIN; CEFOXITIN AB Antibiotic susceptibility surveillance testing was performed on clinical isolates of Neisseria gonorrhoeae collected in September 1989 in the Philippines. Beta-Lactamase was produced by 77 (55%) of 140 isolates. In vitro MIC testing revealed significant resistance to penicillin (MIC for 90% of isolates [MIC90], > 64-mu-g/ml), tetracycline (MIC90, 4-mu-g/ml), and cefmetazole (MIC90, 8-mu-g/ml). Spectinomycin resistance was rare (10 of 117), but the MIC90 was 32-mu-g/ml. Isolates were susceptible to fluoroquinolones and cephalosporins at the time of this survey, as evidenced by the MIC90s of ciprofloxacin (0.25-mu-g/ml), norfloxacin (2.0-mu-g/ml), ofloxacin (0.625-mu-g/ml), cefpodoxime (2.0-mu-g/ml), cefotaxime (1.0-mu-g/ml), ceftazidime (0.25-mu-g/ml), ceftizoxime (0.25-mu-g/ml), and ceftriaxone (0.06-mu-g/ml). To date, ceftriaxone resistance has not emerged, despite the widespread use of this antibiotic in the Philippines. C1 OLONGAPO CITY HLTH DEPT,ZAMBALES,PHILIPPINES. SUBIC CITY SOCIAL HYG CLIN,ZAMBALES,PHILIPPINES. USN HOSP,SUBIC BAY,PHILIPPINES. RP CLENDENNEN, TE (reprint author), USN,ENVIRONM & PREVENT MED UNIT 6,HONOLULU,HI 96860, USA. NR 16 TC 43 Z9 43 U1 0 U2 0 PU AMER SOC MICROBIOLOGY PI WASHINGTON PA 1325 MASSACHUSETTS AVENUE, NW, WASHINGTON, DC 20005-4171 SN 0066-4804 J9 ANTIMICROB AGENTS CH JI Antimicrob. Agents Chemother. PD FEB PY 1992 VL 36 IS 2 BP 277 EP 282 PG 6 WC Microbiology; Pharmacology & Pharmacy SC Microbiology; Pharmacology & Pharmacy GA HC450 UT WOS:A1992HC45000006 PM 1605592 ER PT J AU CLEARY, DD NICHOLS, JW DAVIS, DS AF CLEARY, DD NICHOLS, JW DAVIS, DS TI DESIGN FOR AN ALL-REFLECTION MICHELSON INTERFEROMETER SO APPLIED OPTICS LA English DT Note DE MICHELSON INTERFEROMETER; ALL-REFLECTION AB We present a new design for an all-reflection Michelson interferometer that uses a concave spherical grating in an off-plane Rowland circle configuration. RP CLEARY, DD (reprint author), USN,POSTGRAD SCH,DEPT PHYS,MONTEREY,CA 93943, USA. NR 8 TC 1 Z9 1 U1 3 U2 4 PU OPTICAL SOC AMER PI WASHINGTON PA 2010 MASSACHUSETTS AVE NW, WASHINGTON, DC 20036 SN 0003-6935 J9 APPL OPTICS JI Appl. Optics PD FEB 1 PY 1992 VL 31 IS 4 BP 433 EP 435 PG 3 WC Optics SC Optics GA HB566 UT WOS:A1992HB56600008 PM 20720628 ER PT J AU STROM, CG AF STROM, CG TI OLFACTION AND SINUS SURGERY SO ARCHIVES OF OTOLARYNGOLOGY-HEAD & NECK SURGERY LA English DT Editorial Material RP STROM, CG (reprint author), USN,OAKLAND,CA 94627, 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 1992 VL 118 IS 2 BP 122 EP 122 PG 1 WC Otorhinolaryngology; Surgery SC Otorhinolaryngology; Surgery GA HC810 UT WOS:A1992HC81000003 ER PT J AU STROM, CG AF STROM, CG TI A MULTIPORT PRESSURE CATHETER TO DETERMINE THE SITE OF OBSTRUCTION IN OBSTRUCTIVE SLEEP-APNEA SO ARCHIVES OF OTOLARYNGOLOGY-HEAD & NECK SURGERY LA English DT Editorial Material RP STROM, CG (reprint author), USN,OAKLAND,CA 94627, 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 1992 VL 118 IS 2 BP 122 EP 122 PG 1 WC Otorhinolaryngology; Surgery SC Otorhinolaryngology; Surgery GA HC810 UT WOS:A1992HC81000001 ER PT J AU SCHOMMER, RA OLSZEWSKI, EW SUNTZEFF, NB HARRIS, HC AF SCHOMMER, RA OLSZEWSKI, EW SUNTZEFF, NB HARRIS, HC TI SPECTROSCOPY OF GIANTS IN LMC CLUSTERS .2. KINEMATICS OF THE CLUSTER SAMPLE SO ASTRONOMICAL JOURNAL LA English DT Article ID LARGE MAGELLANIC CLOUD; GLOBULAR-CLUSTERS; PHOTOMETRY; SYSTEM; STARS; GALAXY; MASS AB We analyze velocities for 83 star clusters in the LMC, based on individual stellar velocities measured at the Calcium triplet. One-half of the clusters are objects in the outer parts of the LMC (radius greater-than-or-equal-to 5-degrees), which had no previous velocity determinations. Published velocities for intermediate and old clusters are shown to have had systematic errors. We compare our new velocities with various rotation curve analyses of the LMC, and test aspects of the twisted disk model proposed by Freeman et al. [AJ, 272, 488 (1983)]. Our outer cluster sample and the intermediate age inner clusters form a disk which agrees with the parameters of the optical isophotes and inner H I rotation curve. The oldest clusters still present an enigma; they do not have the kinematics of an isothermal, or slowly rotating, pressure-supported halo. These oldest objects rotate with an amplitude comparable to that of the younger disk and have a small velocity dispersion, although the parameters are poorly determined in this small sample. When the transverse motion of the LMC is taken into account, a single rotating disk solution fits the old and intermediate-aged clusters and other tracers (i.e., there is no need for an additional "tilted disk" system). In the inner 2-degrees the old clusters still exhibit peculiar velocities, as do the CH stars and the old long-period variables. The rotation curve of the LMC does not show signs of a Keplerian falloff out to at least 5-6 disk scale lengths, implying the existence of dark matter associated with the LMC. The mass of the LMC is larger than 1. 5 X 10(10) M.. The integrated mass-to-light ratio of the LMC is is similar to 10. C1 UNIV ARIZONA,STEWARD OBSERV,TUCSON,AZ 85721. USN OBSERV,FLAGSTAFF,AZ 86002. NR 45 TC 128 Z9 128 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 FEB PY 1992 VL 103 IS 2 BP 447 EP 459 DI 10.1086/116074 PG 13 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA HB494 UT WOS:A1992HB49400010 ER PT J AU HILTON, JL AF HILTON, JL TI THE MOTION OF MARS POLE .2. THE EFFECT OF AN ELASTIC MANTLE AND A LIQUID CORE SO ASTRONOMICAL JOURNAL LA English DT Article ID SLIGHTLY ELLIPTICAL EARTH; CHANDLER-WOBBLE; NUTATION; INERTIA; MODEL; OSCILLATIONS; ROTATION; OCEANS; MOMENT; FIELD AB A first-order approximation of the effects of an elastic mantle and liquid core on the motion of Mars' pole are explored. The effect on Mars' Chandler wobble (Eulerian free nutation) is much less dependent on Mars' structure than the Earth's Chandler wobble depends on the Earth's structure. The period of the liquid core free-core nutation (FCN), however, is found to be very sensitive to the mean core radius; if the FCN period is known with an uncertainty of 2 days, then the mean core radius can be inferred with an uncertainty of only 6 km. The amplitude of the forced nutation in the liquid core models is also sensitive to the mean core radius. The sensitivity is high enough that measuring of the amplitudes of the three largest nutation components with an accuracy of a milliarcsecond will produce measures of the mean core radius with uncertainties of 32, 38, and 67 km, respectively. Elastic mantle, solid core models, however, are found to produce no significant difference in the motion of the pole compared to the rigid solid core model. Evidence for some sort of nonrigid polar motion is shown to exist from the Viking lander radar ranges of Mars. Methods of obtaining higher quality observations of Mars' orientation in space, and the applicability of the methods derived for Mars to other planets in the solar system are discussed. RP HILTON, JL (reprint author), USN OBSERV,34TH ST & MASSACHUSETTS AVE NW,WASHINGTON,DC 20392, USA. NR 56 TC 11 Z9 12 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 FEB PY 1992 VL 103 IS 2 BP 619 EP 637 DI 10.1086/116090 PG 19 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA HB494 UT WOS:A1992HB49400026 ER PT J AU MONET, DG DAHN, CC VRBA, FJ HARRIS, HC PIER, JR LUGINBUHL, CB ABLES, HD AF MONET, DG DAHN, CC VRBA, FJ HARRIS, HC PIER, JR LUGINBUHL, CB ABLES, HD TI UNITED-STATES NAVAL OBSERVATORY CCD PARALLAXES OF FAINT STARS .1. PROGRAM DESCRIPTION AND 1ST RESULTS SO ASTRONOMICAL JOURNAL LA English DT Review ID PROPER-MOTION STARS; LOW-MASS STARS; MAIN-SEQUENCE STARS; LATE-TYPE DWARFS; VISUAL MAGNITUDE 15; COLOR CLASS-M; BROWN DWARFS; INFRARED PHOTOMETRY; THEORETICAL-MODELS; WHITE-DWARFS AB The U.S. Naval Observatory CCD trigonometric parallax program is described in detail, including the instrumentation employed, observing procedures followed, and reduction procedures applied. Astrometric results are presented for 72 stars ranging in apparent brightness from V = 15.16 to 19.58. Photometry (V and V - I on the Kron-Cousins system) is presented for the parallax stars and for all 426 individual reference stars employed in the astrometric solutions. Corrections for differential color refraction, calibrated to the observed V - I colors, have been applied to all astrometric measures. The mean errors in the relative parallaxes range from +/- 0.0005" to +/- 0.0027" with a median value of +/- 0.0010". Seventeen of the 23 stars with V(tan) > 200 km s-1 form a well-delineated sequence of extreme subdwarfs covering 11.5 < M(V) < 14.5 in the M(V) vs V - I diagram. The transformation to the M(bol) vs log T(eff) plane is presented and the results are compared with various model interior computations. Within the. limitations due to the uncertain T(eff) scale for cool dwarfs and subdwarfs, the coolest members of the extreme subdwarf sequence appear to be near the hydrogen-burning minimum mass limit for stars with metallicities of [M/H] almost-equal-to -2. RP MONET, DG (reprint author), USN OBSERV,FLAGSTAFF,AZ 86002, USA. NR 119 TC 369 Z9 369 U1 0 U2 1 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 FEB PY 1992 VL 103 IS 2 BP 638 EP 665 DI 10.1086/116091 PG 28 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA HB494 UT WOS:A1992HB49400027 ER PT J AU FELDMAN, U AF FELDMAN, U TI TRANSITIONS FROM METASTABLE LEVELS EMITTED DURING SHORT-DURATION BURSTS - HOW VALID ARE THEIR CALCULATED INTENSITIES SO ASTROPHYSICAL JOURNAL LA English DT Article DE ATOMIC PROCESSES; SUN, FLARES; SUN, X-RAYS, GAMMA-RAYS; X-RAYS, BURSTS ID SOLAR-FLARE; FE-IX; DIAGNOSTICS; SPECTRUM; PLASMAS; LINES; ATOMS AB Recent spectroscopic studies of the quiescent and transient phenomena that take place in the Sun's atmosphere suggest that short-duration bursts may play a significant role in the heating processes of the upper solar atmosphere. Accepting bursts as working processes, concepts of electron density diagnostics in the upper solar atmosphere, and element abundance determinations, methods which are based mostly on line ratios formed in steady state coronal equilibrium are being reexamined. A review of the Fe IX density diagnostics and the effects of high-temperature short-lived bursts on this unique atomic system is given. An account of some of the metastable emission lines used in solar plasma diagnostics, and the electron densities at which they may become affected as a result of short-lived bursts, is also given. RP FELDMAN, U (reprint author), USN,RES LAB,EO HULBURT CTR SPACE RES,CODE 4174,WASHINGTON,DC 20375, USA. NR 25 TC 22 Z9 22 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 FEB 1 PY 1992 VL 385 IS 2 BP 758 EP 762 DI 10.1086/170982 PN 1 PG 5 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA HB576 UT WOS:A1992HB57600034 ER PT J AU BELLENKES, A BASON, R YACAVONE, DW AF BELLENKES, A BASON, R YACAVONE, DW TI SPATIAL DISORIENTATION IN NAVAL AVIATION MISHAPS - A REVIEW OF CLASS A INCIDENTS FROM 1980 THROUGH 1989 SO AVIATION SPACE AND ENVIRONMENTAL MEDICINE LA English DT Note ID PILOTS; WATER AB Spatial Disorientation (SD) has long been a major aeromedical factor contributing to naval aviation mishaps. In the past, it has been viewed as a generalized phenomenon, described by its vertigo-related symptoms. more recently, however, three distinct types of SD have been identified, each based on whether the aviator recognizes and responds to its onset. In the current retrospective study, Flight Surgeon and Mishap Investigation Report narratives from 33 Class A mishaps occurring from 1980 through 1989 were reviewed. SD was determined to have been a causal factor in all cases. The mishaps were examined to categorize SD into the three descriptive types and to describe the relationship (if any) between SD and various mission-related factors. Aircraft type, phase of flight, time of day, pilot experience, and flight topography were all considered. The results indicate that Types I and II SD could be identified as causal factors in all 33 Class A mishaps. Further, most Type I SD was experienced primarily by helicopter pilots at night while most Type II SD incidents affected jet pilots during day missions. RP BELLENKES, A (reprint author), USN,CTR SAFETY,LCDR,MSC,USNR,AEROMED BRANCH,CODE 144,NAVAL AIR STN,NORFOLK,VA 23511, USA. NR 12 TC 20 Z9 21 U1 0 U2 1 PU AEROSPACE MEDICAL ASSOC PI ALEXANDRIA PA 320 S HENRY ST, ALEXANDRIA, VA 22314-3579 SN 0095-6562 J9 AVIAT SPACE ENVIR MD JI Aviat. Space Environ. Med. PD FEB PY 1992 VL 63 IS 2 BP 128 EP 131 PG 4 WC Public, Environmental & Occupational Health; Medicine, General & Internal; Sport Sciences SC Public, Environmental & Occupational Health; General & Internal Medicine; Sport Sciences GA HC248 UT WOS:A1992HC24800006 PM 1546941 ER PT J AU BAKER, BM HANDELMAN, DE AF BAKER, BM HANDELMAN, DE TI POSITIVE POLYNOMIALS AND TIME-DEPENDENT INTEGER-VALUED RANDOM-VARIABLES SO CANADIAN JOURNAL OF MATHEMATICS-JOURNAL CANADIEN DE MATHEMATIQUES LA English DT Article ID C-STAR-ALGEBRAS; COMPACT-GROUPS; FINITE C1 USN ACAD,DEPT MATH,ANNAPOLIS,MD 21402. UNIV OTTAWA,DEPT MATH,OTTAWA K1N 6N5,ONTARIO,CANADA. NR 26 TC 5 Z9 5 U1 0 U2 0 PU CANADIAN MATHEMATICAL SOC PI OTTAWA PA 577 KING EDWARD RD, PO BOX 450, STATION A, OTTAWA ON K1N 6N5, CANADA SN 0008-414X J9 CAN J MATH JI Can. J. Math.-J. Can. Math. PD FEB PY 1992 VL 44 IS 1 BP 3 EP 41 DI 10.4153/CJM-1992-001-6 PG 39 WC Mathematics SC Mathematics GA HK649 UT WOS:A1992HK64900001 ER PT J AU SUBA, EA MCKENNA, TM WILLIAMS, TJ AF SUBA, EA MCKENNA, TM WILLIAMS, TJ TI INVIVO AND INVITRO EFFECTS OF ENDOTOXIN ON VASCULAR RESPONSIVENESS TO NOREPINEPHRINE AND SIGNAL TRANSDUCTION IN THE RAT SO CIRCULATORY SHOCK LA English DT Article DE PHOSPHOINOSITIDE HYDROLYSIS; ISOMETRIC CONTRACTION; ALPHA-ADRENERGIC RECEPTOR; DOSE-RESPONSE CURVE; GRAM-NEGATIVE SEPSIS ID PROTEIN KINASE-C; PHOSPHATIDYLINOSITOL TURNOVER; CONTRACTILE RESPONSE; PHOSPHOLIPASE-C; PHORBOL ESTER; AORTA; SEPSIS; STIMULATION; HYDROLYSIS; ACTIVATION AB We investigated, after in vitro and in vivo exposure to gram-negative endotoxin, the altered responsiveness of rat aortic smooth muscle to catecholamines. Two hour exposure of aortic rings from normal rats to 1 00 ng/ml of Escherichia coli 0111:B4 endotoxin in vitro in an artificial medium supplemented with 5% fetal calf serum at 37-degrees-C did not effect the basal and norepinephrine (NE)-stimulated (10-mu-M, 1 hr, 37-degrees-C) phosphoinositide (PI) hydrolysis and isometric contractions induced by graded doses (1 nM to 10.0-mu-M) of NE. Increasing the incubation time with endotoxin to 18 hr did not alter the basal PI hydrolysis but significantly (P < 0.05) decreased the NE-induced PI hydrolysis (30% inhibition) and contractile sensitivity to NE (increase of EC50 from 20.0 +/- 3.8 to 156.4 +/- 46.7 nM). Qualitatively similar results were obtained in experiments where rats were injected intravenously with buffer or an LD50 dose (10 mg/kg) of endotoxin. In these ex vivo measurements, only an 18 hr exposure to endotoxin caused significant (P < 0.001) decreases in basal (58% inhibition) and NE-stimulated (75% inhibition) PI hydrolysis and in NE-induced isometric contractions (increase of EC50 from 11.0 +/- 3.3 to 664.1 +/- 280.0 nM). The results show that the endotoxin-induced hyporeactivity to alpha-1-adrenergic receptor stimulation 1) is markedly dependent on the length of endotoxin exposure, 2) does not require (although may be enhanced by) contact with blood cells and plasma, and 3) is paralleled by a decrease in both basal and NE-stimulated PI hydrolysis. This latter finding suggests that alpha-1-adrenergic hyporesponsiveness may be due to impairment by endotoxin of PI hydrolysis that is the initial response of the membrane transduction system of vascular smooth muscle membrane. The data are consistent with either a marked decrease in receptor number and/or a postreceptor impairment. C1 USN,MED RES INST,SEPT SHOCK RES PROGRAM,MAIL STOP 42,BETHESDA,MD 20889. NR 33 TC 29 Z9 30 U1 0 U2 0 PU WILEY-LISS PI NEW YORK PA DIV JOHN WILEY & SONS INC 605 THIRD AVE, NEW YORK, NY 10158-0012 SN 0092-6213 J9 CIRC SHOCK JI Circ. Shock PD FEB PY 1992 VL 36 IS 2 BP 127 EP 133 PG 7 WC Cardiac & Cardiovascular Systems SC Cardiovascular System & Cardiology GA HB374 UT WOS:A1992HB37400006 PM 1316243 ER PT J AU HAAKE, D KENNEDY, C GOETZ, MB AF HAAKE, D KENNEDY, C GOETZ, MB TI PYELONEPHRITIS, RASH, AND PROGRESSIVE RESPIRATORY-FAILURE IN A PREGNANT WOMAN SO CLINICAL INFECTIOUS DISEASES LA English DT Discussion ID VARICELLA-ZOSTER VIRUS; PRECLINICAL TOXICOLOGY; CHICKENPOX PNEUMONIA; HEALTHY-ADULTS; HERPES-ZOSTER; ACYCLOVIR; INFECTION; MANIFESTATIONS; CHILDREN; TESTS C1 UNIV CALIF LOS ANGELES,SCH MED,DEPT MED,DIV INFECT DIS,LOS ANGELES,CA 90024. USN HOSP,DIV INFECT DIS,SAN DIEGO,CA 92134. UNIV CALIF LOS ANGELES,SEPULVEDA VET ADM MED CTR,LOS ANGELES CTY OLIVE VIEW MED CTR,SEPULVEDA,CA. OI Goetz, Matthew/0000-0003-4542-992X NR 69 TC 2 Z9 2 U1 0 U2 1 PU UNIV CHICAGO PRESS PI CHICAGO PA 5720 S WOODLAWN AVE, CHICAGO, IL 60637 SN 1058-4838 J9 CLIN INFECT DIS JI Clin. Infect. Dis. PD FEB PY 1992 VL 14 IS 2 BP 599 EP 607 PG 9 WC Immunology; Infectious Diseases; Microbiology SC Immunology; Infectious Diseases; Microbiology GA HD518 UT WOS:A1992HD51800032 PM 1554851 ER PT J AU BRUCKNER, JD LICHTMAN, DM ALEXANDER, AH AF BRUCKNER, JD LICHTMAN, DM ALEXANDER, AH TI COMPLEX DISLOCATIONS OF THE DISTAL RADIOULNAR JOINT - RECOGNITION AND MANAGEMENT SO CLINICAL ORTHOPAEDICS AND RELATED RESEARCH LA English DT Article ID GALEAZZI FRACTURES; SUBLUXATION; TOMOGRAPHY; DIAGNOSIS; FOREARM; RADIUS AB Contrary to most reported series, it has been the authors' experience that dislocations of the distal radioulnar joint (DRUJ) associated with fractures of the forearm are frequently irreducible. This report reviews the authors' experience with these injuries, focusing on the recognition and management of what the authors call "complex" DRUJ dislocations: dislocations characterized by obvious irreducibility, recurrent subluxation, or "mushy" reduction caused by soft tissue or bone interposition. From 1984 until 1989, at the authors' institution, 11 patients were treated for fractures of the radius associated with dislocations of the DRUJ. Eight of these patients had a classic Galeazzi fracture dislocation. Two patients had severe open radius and ulnar fractures. One had an unstable comminuted intraarticular fracture of the distal radius. Of these 11 patients, four had "complex" dislocations of the DRUJ. In two cases, the extensor carpi ulnaris was displaced volar to the distal ulna, necessitating open reduction. A third case involved delayed recognition of multiple wrist and forearm joint dislocations associated with a severe open fracture of both bones of the forearm and required late exploration, reduction, and temporary internal fixation. A fourth case involved recurrent dorsal subluxation of the distal ulna after open reduction and internal fixation of a comminuted intraarticular distal radius fracture. It is clear that complex dislocations of the DRUJ occur more frequently than previously noted. Careful attention to these injuries during initial reduction attempts will reveal "mushy" or unobtainable reductions, an important indication for exploration for entrapped tendon, bone, or soft tissue. C1 USN HOSP,DEPT ORTHOPAED SURG,OAKLAND,CA 94627. NR 42 TC 30 Z9 30 U1 0 U2 0 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 FEB PY 1992 IS 275 BP 90 EP 103 PG 14 WC Orthopedics; Surgery SC Orthopedics; Surgery GA HC797 UT WOS:A1992HC79700014 PM 1735239 ER PT J AU TOWNSEND, DW MAYER, LM DORTCH, Q SPINRAD, RW AF TOWNSEND, DW MAYER, LM DORTCH, Q SPINRAD, RW TI VERTICAL STRUCTURE AND BIOLOGICAL-ACTIVITY IN THE BOTTOM NEPHELOID LAYER OF THE GULF OF MAINE SO CONTINENTAL SHELF RESEARCH LA English DT Article ID BENTHIC BOUNDARY-LAYER; SANTA-CATALINA BASIN; DEEP-SEA; PACIFIC-OCEAN; BENTHOPELAGIC PLANKTON; OXYGEN-CONSUMPTION; NEAR-BOTTOM; WATER; ZOOPLANKTON; RATES AB The bottom nepheloid layer (BNL) was investigated at a number of hydrographically different sites in the Gulf of Maine during August 1987. Observations were based on hydrographic measurements made from a surface ship and closely-spaced, near-bottom samples collected using a submersible. The BNL generally occurred as a turbid layer which extended 15-30 m above the bottom (m.a.b.), as indicated by in situ light transmission and increased concentrations of total suspended particulate matter (SPM). Phytoplankton pigments, electron transport activity (ETS), extracellular proteolytic enzyme activity (EPA), concentrations of particulate organic carbon and nitrogen (POC and PON), and protein were generally elevated in the BNL. They also displayed vertical distribution patterns in relation to near-bottom depth zones of increased abundances of zooplankton, bacteria and autotrophic and heterotrophic nanoplankton. We describe two zones of biological significance in the BNL. The first, at about 20 m.a.b. at most stations, was associated with greater zooplankton biomass (> 80-mu-m) and copepod abundances than those depth strata either above or below, and appeared to be related to a higher quality of food particles near the top of the BNL. A second zone was seen 1-3 m.a.b. at most stations in association with the greatest levels of SPM. This deeper zone was generally of a poorer food quality, as reflected by ratios of protein-N to total-N and showed increases in cell-specific EPA. We discuss the areal variability of the BNL in the Gulf of Maine as well as the biological enhancement and vertical structure as likely influenced by both physical and biological processes. C1 UNIV MAINE,DARLING MARINE CTR,DEPT OCEANOG,WALPOLE,ME 04573. LOUISIANA UNIV,MARINE CONSORTIUM,CHAUVIN,LA 70344. OFF NAVAL RES,ARLINGTON,VA 22217. RP TOWNSEND, DW (reprint author), BIGELOW LAB OCEAN SCI,BOOTHBAY HARBOR,ME 04575, USA. RI Mayer, Lawrence/A-1337-2009 NR 47 TC 23 Z9 24 U1 0 U2 7 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0278-4343 J9 CONT SHELF RES JI Cont. Shelf Res. PD FEB-MAR PY 1992 VL 12 IS 2-3 BP 367 EP 387 DI 10.1016/0278-4343(92)90037-K PG 21 WC Oceanography SC Oceanography GA HH775 UT WOS:A1992HH77500008 ER PT J AU HUGGETT, RJ UNGER, MA SELIGMAN, PF VALKIRS, AO AF HUGGETT, RJ UNGER, MA SELIGMAN, PF VALKIRS, AO TI THE MARINE BIOCIDE TRIBUTYLTIN SO ENVIRONMENTAL SCIENCE & TECHNOLOGY LA English DT Article ID SAN-DIEGO BAY; ANTIFOULING PAINTS; ACUTE TOXICITY; NUCELLA-LAPILLUS; COPEPOD; LARVAE; WATERS; CRABS; OXIDE C1 VIRGINIA INST MARINE SCI,DIV CHEM & TOXICOL,GLOUCESTER POINT,VA 23062. COLL WILLIAM & MARY,VIRGINIA INST MARINE SCI,ANALYT CHEM SECT,GLOUCESTER POINT,VA 23062. COMP SCI CORP,SAN DIEGO,CA 92110. USN,CTR OCEAN SYST,DIV ENVIRONM SCI,SAN DIEGO,CA 92152. RP HUGGETT, RJ (reprint author), COLL WILLIAM & MARY,SCH MARINE SCI,GLOUCESTER POINT,VA 23062, USA. NR 38 TC 168 Z9 170 U1 1 U2 7 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0013-936X J9 ENVIRON SCI TECHNOL JI Environ. Sci. Technol. PD FEB PY 1992 VL 26 IS 2 BP 232 EP 237 DI 10.1021/es00026a001 PG 6 WC Engineering, Environmental; Environmental Sciences SC Engineering; Environmental Sciences & Ecology GA HB871 UT WOS:A1992HB87100007 ER PT J AU PANDE, SG HARDY, DR AF PANDE, SG HARDY, DR TI EVALUATION OF REFRACTIVITY INTERCEPT AS A METHOD FOR DETERMINING FUEL COMPOSITION ACCORDING TO HYDROCARBON TYPE SO FUEL LA English DT Article DE FUEL; COMPOSITION; REFRACTIVITY INTERCEPT ID MAGNETIC-RESONANCE SPECTROSCOPY; C-13 NMR-SPECTROSCOPY; PETROLEUM FRACTIONS; QUANTITATIVE C-13; CRUDE-OIL; PROTON; PARAMETERS; PRODUCTS AB A recently published refractivity intercept (Ri) method for determining the composition of petroleum distillates was examined for model jet fuels. Based on five model jet fuels of diverse compound class composition, at best, the Ri method predicted the composition of only one of the five fuels within an accuracy of +/- 26%. Limited improvement was obtained on employing Ri coefficients derived from the various model mixtures examined. Poor predictability of the Ri method is likely related to the erroneous assumption that Ri, as defined, is additive for the compositionally defined classes of interest. In addition, the methodology requires a high degree of accuracy in measuring both density and refractive index. C1 USN,RES LAB,WASHINGTON,DC 20375. RP PANDE, SG (reprint author), GEOCENTERS INC,FT WASHINGTON,MD 20744, USA. NR 17 TC 0 Z9 0 U1 1 U2 4 PU BUTTERWORTH-HEINEMANN LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, OXON, ENGLAND OX5 1GB SN 0016-2361 J9 FUEL JI Fuel PD FEB PY 1992 VL 71 IS 2 BP 231 EP 235 DI 10.1016/0016-2361(92)90014-F PG 5 WC Energy & Fuels; Engineering, Chemical SC Energy & Fuels; Engineering GA GX950 UT WOS:A1992GX95000014 ER PT J AU SLACK, GC MCNAIR, HM WASSERZUG, L AF SLACK, GC MCNAIR, HM WASSERZUG, L TI CHARACTERIZATION OF SEMTEX BY SUPERCRITICAL FLUID EXTRACTION AND OFF-LINE GC-ECD AND GC-MS SO HRC-JOURNAL OF HIGH RESOLUTION CHROMATOGRAPHY LA English DT Article DE SUPERCRITICAL FLUID EXTRACTION; GC-MSD; GC-ECD; SEMTEX AB Researchers using electron capture for the detection of explosive vapors currently claim the ability to detect the presence of RDX in Semtex - a plastic explosive comprising hexahydro-1,3,5-trinitro-1,3,5-triazane (RDX) in a matrix of styrene-butadiene copolymer and hydrocarbon oil. The vapor pressure of RDX at room temperature is 0.006 ppb, and therefore well below the detection limit of electron capture detection (ECD). The positive response generated by ECD is, consequently, not from the presence of RDX, but from some other component. This paper describes the extraction and identification of several compounds in Semtex, along with the determination of which is responsible for the positive response of an ECD-based detector. From the results of supercritical fluid extraction and off-line gas chromatography combined with electron capture and mass spectrometric detection, it has been concluded that ethylene glycol dinitrate is the component responsible for the positive ECD response. This conclusion is based on the requirements necessary for ECD detection, i.e. electronegativity, and a sufficient vapor pressure. The other compounds present were eliminated as possible choices because they either can not be detected by an ECD or do not have sufficient vapor pressure under ambient conditions. C1 VIRGINIA POLYTECH INST & STATE UNIV,DEPT CHEM,BLACKSBURG,VA 24061. USN,CTR EOD TECHNOL,INDIAN HEAD,MD 20640. NR 7 TC 8 Z9 8 U1 2 U2 5 PU DR ALFRED HUTHIG VERLAG GMBH PI HEIDELBERG 1 PA POSTFACH 102869, W-69018 HEIDELBERG 1, GERMANY SN 0935-6304 J9 HRC-J HIGH RES CHROM JI HRC-J. High Resolut. Chromatogr. PD FEB PY 1992 VL 15 IS 2 BP 102 EP 104 PG 3 WC Chemistry, Analytical SC Chemistry GA HH038 UT WOS:A1992HH03800009 ER PT J AU KAHANER, DK AF KAHANER, DK TI RESEARCH-AND-DEVELOPMENT IN JAPAN SO IEEE MICRO LA English DT Article RP KAHANER, DK (reprint author), USN,WASHINGTON,DC 20350, 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 0272-1732 J9 IEEE MICRO JI IEEE Micro PD FEB PY 1992 VL 12 IS 1 BP 7 EP & PG 0 WC Computer Science, Hardware & Architecture; Computer Science, Software Engineering SC Computer Science GA HD841 UT WOS:A1992HD84100002 ER PT J AU JANASWAMY, R AF JANASWAMY, R TI OBLIQUE SCATTERING FROM LOSSY PERIODIC SURFACES WITH APPLICATION TO ANECHOIC CHAMBER ABSORBERS SO IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION LA English DT Article ID ELECTROMAGNETIC SCATTERING; CYLINDERS AB Plane wave scattering from lossy, periodic surfaces with periodicity in one direction is considered for arbitrary polarization and incidence angles. The material is assumed to be homogeneous, characterized by complex values of permittivity and permeability. Muller type coupled integral equations are derived for the surface electric and magnetic currents. Power reflection coefficient is defined in terms of the scattered far fields. The integral equations are solved by the boundary element method (BEM) with constant elements. Arbitrary surfaces are accomodated by approximating the actual profile by means of linear segments. Other speed-up techniques are utilized to generate a numerically efficient solution. Substantial comparison is made for special cases to verify the formulation. Reflection coefficient is calculated for a variety of surface shapes such as rectangular, sinusoidal and triangular. A new profile shape is presented that results in a lower reflection coefficient compared to the commonly used triangular shape. For the specific case of the triangular profile, a systematic study is carried out for the dependence of reflection coefficient on various parameters. RP JANASWAMY, R (reprint author), USN,POSTGRAD SCH,DEPT ELECT & COMP ENGN,CODE EC-JS,MONTEREY,CA 93943, USA. NR 18 TC 38 Z9 39 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 FEB PY 1992 VL 40 IS 2 BP 162 EP 169 DI 10.1109/8.127400 PG 8 WC Engineering, Electrical & Electronic; Telecommunications SC Engineering; Telecommunications GA HL341 UT WOS:A1992HL34100007 ER PT J AU ROBERTSON, RC HA, TT AF ROBERTSON, RC HA, TT TI ERROR PROBABILITIES OF FAST FREQUENCY-HOPPED MFSK WITH NOISE-NORMALIZATION COMBINING IN A FADING CHANNEL WITH PARTIAL-BAND INTERFERENCE SO IEEE TRANSACTIONS ON COMMUNICATIONS LA English DT Article ID DIVERSITY AB An error probability analysis is performed for an Mary orthogonal frequency-shift keying (MFSK) communication system employing fast frequency-hopped (FFH) spread spectrum waveforms transmitted over a frequency-nonselective, slowly fading channel with partial-band interference. Diversity is obtained using multiple hops per data bit. A procedure referred to as noise-normalization combining is employed by the system receiver to minimize partial-band interference effects. Each diversity reception is assumed to fade independently according to a Rician process. The partial-band interference is modeled as a Gaussian process. Thermal noise is also included in the analysis. Forward error correction coding is applied using convolutional codes and Reed-Solomon codes. Diversity is found to dramatically reduce the degradation of the noise-normalization receiver caused by partial-band interference regardless of the strength of the direct signal component. In addition, diversity offers significant performance improvement when channel fading is strong. Further significant performance improvement is obtained for higher modulation orders (M > 2). Uncoded receiver performance with a diversity of four is roughly comparable to coded receiver performance with no diversity for ratios of bit energy-to-interference noise density in the range between roughly 12 and 22 dB. Substantial improvements in receiver performance are obtained by combining diversity, higher modulation orders, and coding. RP ROBERTSON, RC (reprint author), USN,NAVAL POSTGRAD SCH,DEPT ELECT & COMP ENGN,CODE EC RC,MONTEREY,CA 93943, USA. NR 13 TC 17 Z9 22 U1 0 U2 0 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0090-6778 J9 IEEE T COMMUN JI IEEE Trans. Commun. PD FEB PY 1992 VL 40 IS 2 BP 404 EP 412 DI 10.1109/26.129202 PG 9 WC Engineering, Electrical & Electronic; Telecommunications SC Engineering; Telecommunications GA HP271 UT WOS:A1992HP27100019 ER PT J AU SCHUELLER, KA BUTLER, JT AF SCHUELLER, KA BUTLER, JT TI ON THE DESIGN OF COST-TABLES FOR REALIZING MULTIPLE-VALUED CIRCUITS SO IEEE TRANSACTIONS ON COMPUTERS LA English DT Article DE COST-TABLE; LOGIC DESIGN; MINIMIZATION; MULTIPLE-VALUED LOGIC; SYNTHESIS AB We propose a heuristic for finding minimal cost-tables for use in the design of multiple-valued logic circuits. It is an iterative approach, in which a good table of size t is composed of a good table of size t - 1, etc. We analyze its performance, comparing it with three other heuristics. The importance of finding good cost-tables is demonstrated by an analysis that shows there is a wide variation in both cost-table performance and in the performance of heuristics for generating cost-tables. We study linear cost, a general cost function of which two previously studied cost functions are special cases. It is shown that the minimal cost-table using one of the (infinitely many) linear cost functions is identical to a minimal cost-table using any other linear cost function. Thus, a heuristic for finding the minimal cost-table using the linear cost function is independent of the specific cost function parameters. This result and our observation of well-studied nonlinear cost functions indicate that cost-table design is only marginally dependent on the cost function. We show two additional results on cost-table design. First, it is demonstrated that a search for minimal cost-tables cannot exclude certain seemingly useless functions called composite functions. Second, while the complexity of cost-table design appears to preclude a computationally efficient general algorithm for finding the minimal cost-table, a special case allows efficient design. For the case of a small cost-table, we show how to find the minimal cost-table. C1 USN,POSTGRAD SCH,DEPT ELECT & COMP ENGN,MONTEREY,CA 93943. RP SCHUELLER, KA (reprint author), YOUNGSTOWN STATE UNIV,DEPT MATH & COMP SCI,YOUNGSTOWN,OH 44555, USA. NR 16 TC 2 Z9 2 U1 0 U2 0 PU IEEE COMPUTER SOC PI LOS ALAMITOS PA 10662 LOS VAQUEROS CIRCLE, PO BOX 3014, LOS ALAMITOS, CA 90720-1264 SN 0018-9340 J9 IEEE T COMPUT JI IEEE Trans. Comput. PD FEB PY 1992 VL 41 IS 2 BP 178 EP 189 DI 10.1109/12.123394 PG 12 WC Computer Science, Hardware & Architecture; Engineering, Electrical & Electronic SC Computer Science; Engineering GA HG227 UT WOS:A1992HG22700004 ER PT J AU GITTLEMAN, B DWAN, TE SMILEY, CS AF GITTLEMAN, B DWAN, TE SMILEY, CS TI SYSTEM-IDENTIFICATION - HUMAN TRACKING RESPONSE SO IEEE TRANSACTIONS ON EDUCATION LA English DT Article AB Engineers often analyze and simulate mechanical, electrical, or combinational systems. They seldom, however, use the same techniques applied toward human beings. The most accurate model of the newest high-tech aircraft would be incomplete without a model of the pilot. Humans exhibit many unique characteristics which must be taken into account in system design. This paper discusses an experiment performed at the U.S. Naval Academy to develop transfer functions for human tracking response. The experiment tested one-dimensional, sine-wave tracking to determine time delay and the transfer function. Using system identification techniques, the best models were selected for each of five different frequencies of the test sine-wave input. Bode plots, magnitude, and phase, for the system that best models the way humans react, are given. Step responses for these models are also given. This entire process provides an excellent tutorial in programming, system modeling, and simulation. RP GITTLEMAN, B (reprint author), USN ACAD,DEPT WEAPONS & SYST ENGN,ANNAPOLIS,MD 21402, USA. NR 8 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 0018-9359 J9 IEEE T EDUC JI IEEE Trans. Educ. PD FEB PY 1992 VL 35 IS 1 BP 31 EP 37 DI 10.1109/13.123414 PG 7 WC Education, Scientific Disciplines; Engineering, Electrical & Electronic SC Education & Educational Research; Engineering GA HH953 UT WOS:A1992HH95300004 ER PT J AU WU, CS WEN, CP SATO, RN HU, M TU, CW ZHANG, J FLESNER, LD PHAM, L NAYER, PS AF WU, CS WEN, CP SATO, RN HU, M TU, CW ZHANG, J FLESNER, LD PHAM, L NAYER, PS TI NOVEL GAAS/ALGAAS MULTIQUANTUM-WELL SCHOTTKY-JUNCTION DEVICE AND ITS PHOTOVOLTAIC LWIR DETECTION SO IEEE TRANSACTIONS ON ELECTRON DEVICES LA English DT Article ID INFRARED DETECTOR; ABSORPTION AB We have, for the first time, demonstrated photovoltaic detection for a multiple quantum-well (MQW) long-wavelength infrared (LWIR) detector. With a blocking layer, the MQW detector exhibits Schottky I-V characteristics with extremely low dark current and excellent ideality factor. The dark current is 5 x 10(-14) A for a 100 x 100-mu-m2 detector (designed for 10-mu-m response) at 40 K, nearly nine orders of magnitude lower than that of a similar MQW LWIR detector without the blocking layer. The ideality factor is approximately 1.01-1.05 at T = 40-80 K. The measured "Schottky"-barrier height is consistent with the energy difference between first excited states and ground states, or the peak of spectral response. We also, for the first time, report a measured effective Richardson constant (A**) for a GaAs/AlGaAs heterojunction using this blocking layer structure. The A** is low approximately 2.3 A/cm2/K2. C1 HUGHES AIRCRAFT CO,HUGHES MICROELECTR CTR,CARLSBAD,CA 92008. UNIV CALIF SAN DIEGO,DEPT ELECT & COMP ENGN,LA JOLLA,CA 92093. USN,CTR OCEAN SYST,SAN DIEGO,CA 92152. HUGHES AIRCRAFT CO,DIV SPACE & STRATEG ENGN,EL SEGUNDO,CA 90245. RP WU, CS (reprint author), HUGHES AIRCRAFT CO,DIV MICROWAVE PROD,TORRANCE,CA 90509, USA. NR 16 TC 23 Z9 23 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 0018-9383 J9 IEEE T ELECTRON DEV JI IEEE Trans. Electron Devices PD FEB PY 1992 VL 39 IS 2 BP 234 EP 241 DI 10.1109/16.121678 PG 8 WC Engineering, Electrical & Electronic; Physics, Applied SC Engineering; Physics GA GZ714 UT WOS:A1992GZ71400003 ER PT J AU VANBUREN, AL AF VANBUREN, AL TI NEAR-FIELD CALIBRATION ARRAYS FOR ACOUSTIC WAVE-FIELD DETERMINATION SO IEEE TRANSACTIONS ON INSTRUMENTATION AND MEASUREMENT LA English DT Article; Proceedings Paper CT 8TH ANNUAL CONF ON THE INSTRUMENTATION AND MEASUREMENT TECHNOLOGY ( IMTC/91 ) CY MAY 14-16, 1991 CL ATLANTA, GA SP IEEE, INSTRUMENTAT MEASUREMENT SOC, IEEE, ATLANTA SECTION AB This paper describes the use of the near-field calibration array (NFCA) to determine the far-field properties of acoustic receivers and projectors by measurements made in their near-field. When used as a projector to evaluate receivers, the NFCA produces a nearly uniform plane wave over a large volume in its near-field and over a large frequency range. When used as a receiver to evaluate projectors, the NFCA becomes a plane-wave filter for acoustic radiation (or target scattering) originating from within the plane-wave volume. The basis of the NFCA is a reciprocity principle. Numerical implementation of this principle provides the complex weighting factors to be used as shading coefficients for the individual elements in the NFCA. The original Trott NFCA's [W. J. Trott, J. Acoust. Soc. Am., vol. 36, pp. 1557-1568, Aug. 1964] were planar. This paper describes the subsequent extension of the concept to a cylindrical NFCA suitable for determining the azimuthal far-field pattern and a spherical NFCA that allows a determination of the entire three-dimensional far-field pattern. RP VANBUREN, AL (reprint author), USN,RES LAB,UNDERWATER SOUND REFERENCE DETACHMENT,ORLANDO,FL 32856, USA. NR 8 TC 1 Z9 1 U1 0 U2 0 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0018-9456 J9 IEEE T INSTRUM MEAS JI IEEE Trans. Instrum. Meas. PD FEB PY 1992 VL 41 IS 1 BP 22 EP 26 DI 10.1109/19.126624 PG 5 WC Engineering, Electrical & Electronic; Instruments & Instrumentation SC Engineering; Instruments & Instrumentation GA HK154 UT WOS:A1992HK15400005 ER PT J AU TING, RY AF TING, RY TI A REVIEW ON THE DEVELOPMENT OF PIEZOELECTRIC COMPOSITES FOR UNDERWATER ACOUSTIC TRANSDUCER APPLICATIONS SO IEEE TRANSACTIONS ON INSTRUMENTATION AND MEASUREMENT LA English DT Article; Proceedings Paper CT 8TH ANNUAL CONF ON THE INSTRUMENTATION AND MEASUREMENT TECHNOLOGY ( IMTC/91 ) CY MAY 14-16, 1991 CL ATLANTA, GA SP IEEE, INSTRUMENTAT MEASUREMENT SOC, IEEE, ATLANTA SECTION ID POLAR GLASS-CERAMICS AB For future sonar transducer applications that emphasize the detection of acoustical signals in a hydrostatic mode, new piezoelectric composite materials have been developed. Ceramic-polymer composites having "1-3" and "0-3" connectivity patterns are shown to exhibit much higher sensitivities than conventional PZT ceramics. Glass-ceramic composites are free of aging, and have potential applications in standard transducers. RP TING, RY (reprint author), USN,RES LAB,UNDERWATER SOUND REF DETACHMENT,ORLANDO,FL 32856, USA. NR 9 TC 16 Z9 17 U1 3 U2 6 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0018-9456 J9 IEEE T INSTRUM MEAS JI IEEE Trans. Instrum. Meas. PD FEB PY 1992 VL 41 IS 1 BP 64 EP 67 DI 10.1109/19.126633 PG 4 WC Engineering, Electrical & Electronic; Instruments & Instrumentation SC Engineering; Instruments & Instrumentation GA HK154 UT WOS:A1992HK15400014 ER PT J AU BRODINE, SK OLDFIELD, EC CORWIN, AL THOMAS, RJ RYAN, AB HOLMBERG, J MOLGAARD, CA GOLBECK, AL RYDEN, LA BENENSON, AS ROBERTS, CR BLATTNER, WA AF BRODINE, SK OLDFIELD, EC CORWIN, AL THOMAS, RJ RYAN, AB HOLMBERG, J MOLGAARD, CA GOLBECK, AL RYDEN, LA BENENSON, AS ROBERTS, CR BLATTNER, WA TI HTLV-I AMONG UNITED-STATES MARINES STATIONED IN A HYPERENDEMIC AREA - EVIDENCE FOR FEMALE-TO-MALE SEXUAL TRANSMISSION SO JOURNAL OF ACQUIRED IMMUNE DEFICIENCY SYNDROMES AND HUMAN RETROVIROLOGY LA English DT Article DE HUMAN T-CELL LEUKEMIA LYMPHOMA VIRUS; SEXUALLY TRANSMITTED DISEASES ID CELL LEUKEMIA-VIRUS; TROPICAL SPASTIC PARAPARESIS; LYMPHOTROPIC VIRUS; DRUG-ABUSERS; BLOOD-DONORS; ANTIBODIES; INFECTION; LYMPHOMA; SEROPREVALENCE; RETROVIRUS AB Among 5,255 active duty United States Marines on permanent tour in Okinawa, Japan, screened for human T-cell leukemia/lymphoma virus type I (HTLV-I) seropositivity, 3 (0.06%) were confirmed by Western blot analysis to have core and envelope reactivity. All three seropositive individuals have a history of prolonged sexual contact with Okinawan women, and two of the three individuals are married to seropositive Okinawan wives. Two gave a prior history of gonorrhea, while all three were negative for syphilis (MHA-TP) and hepatitis B. No other risk factors associated with HTLV-I seropositivity in the United States were identified. A banked sample from one individual, obtained 8 months after initial sexual relations with his HTLV-I-seropositive Okinawan spouse and 20 months before being retested in the survey, showed a pattern suggesting seroconversion. Although based on small numbers, these data suggest that female-to-male transmission of HTLV-I occurs in the absence of other cofactors, e.g., ulcerative genital lesions. C1 NAVAL HOSP,US PACIFIC COMMAND JOINT BLOOD PROGRAM OFF,OKINAWA,JAPAN. USN HOSP,DEPT CLIN INVEST,SAN DIEGO,CA 92134. USN,MED RES & DEV COMMAND,BETHESDA,MD 20814. USN,ENVIRONM PREVENT MED UNIT 6,HONOLULU,HI. MARINE DIV 3,OKINAWA,JAPAN. SAN DIEGO STATE UNIV,GRAD SCH PUBL HLTH,SAN DIEGO,CA 92182. SAN DIEGO STATE UNIV,DEPT MATH SCI,SAN DIEGO,CA 92182. WALTER REED ARMY MED CTR,DIV RETROVIROL,WASHINGTON,DC 20307. NCI,VIRAL EPIDEMIOL SECT,BETHESDA,MD 20892. RP BRODINE, SK (reprint author), USN HOSP,DEPT INTERNAL MED,DIV INFECT DIS,SAN DIEGO,CA 92134, USA. NR 34 TC 10 Z9 10 U1 0 U2 0 PU LIPPINCOTT-RAVEN PUBL PI PHILADELPHIA PA 227 EAST WASHINGTON SQ, PHILADELPHIA, PA 19106 SN 1077-9450 J9 J ACQ IMMUN DEF SYND JI J. Acquir. Immune Defic. Syndr. Hum. Retrovirol. PD FEB PY 1992 VL 5 IS 2 BP 158 EP 162 PG 5 WC Immunology; Infectious Diseases SC Immunology; Infectious Diseases GA GZ902 UT WOS:A1992GZ90200010 PM 1732508 ER PT J AU STREINZ, CC SCALA, J WAGNER, JW MORAN, PJ AF STREINZ, CC SCALA, J WAGNER, JW MORAN, PJ TI PROJECTION OF IMPROVED HIGH-RATE DISCHARGE PERFORMANCE FOR HOMOGENIZED CATHODE LI/I2 (P2VP) BATTERIES SO JOURNAL OF APPLIED ELECTROCHEMISTRY LA English DT Article ID RATE LIMITING MECHANISM; CELL COMPONENTS AB It has been recently proposed that implementing a cathode with a homogeneous distribution of iodine and P2VP into Li/I2 (P2VP) batteries would be a means of enhancing high rate discharge performance. A procedure for predicting high rate discharge performance gains for such cells is presented. The projected high rate discharge performance for cells with homogeneous cathodes is superior to the performance of conventional cells. C1 USN ACAD,DEPT MECH ENGN,ANNAPOLIS,MD 21402. RP STREINZ, CC (reprint author), JOHNS HOPKINS UNIV,DEPT MAT SCI & ENGN,CORROS & ELECTROCHEM RES LAB,BALTIMORE,MD 21218, USA. NR 13 TC 0 Z9 0 U1 1 U2 2 PU CHAPMAN HALL LTD PI LONDON PA 2-6 BOUNDARY ROW, LONDON, ENGLAND SE1 8HN SN 0021-891X J9 J APPL ELECTROCHEM JI J. Appl. Electrochem. PD FEB PY 1992 VL 22 IS 2 BP 99 EP 103 DI 10.1007/BF01023810 PG 5 WC Electrochemistry SC Electrochemistry GA HC600 UT WOS:A1992HC60000002 ER PT J AU FELIX, CA NAU, MM TAKAHASHI, T MITSUDOMI, T CHIBA, I POPLACK, DG REAMAN, GH COLE, DE LETTERIO, JJ WHANGPENG, J KNUTSEN, T MINNA, JD AF FELIX, CA NAU, MM TAKAHASHI, T MITSUDOMI, T CHIBA, I POPLACK, DG REAMAN, GH COLE, DE LETTERIO, JJ WHANGPENG, J KNUTSEN, T MINNA, JD TI HEREDITARY AND ACQUIRED P53 GENE-MUTATIONS IN CHILDHOOD ACUTE LYMPHOBLASTIC-LEUKEMIA SO JOURNAL OF CLINICAL INVESTIGATION LA English DT Article DE B-CELL PRECURSOR; GERMLINE; LI-FRAUMENI SYNDROME; T-CELL; TUMOR SUPPRESSOR GENE ID POLYMERASE CHAIN-REACTION; CELLULAR TUMOR-ANTIGEN; POINT MUTATIONS; LUNG-CANCER; T-CELL; BREAST-CANCER; BLAST CRISIS; ONCOGENE; DNA; CHROMOSOME-17 AB The p53 gene was examined in primary lymphoblasts of 25 pediatric patients with acute lymphoblastic leukemia by the RNase protection assay and by single strand conformation polymorphism analysis in 23 of 25 cases. p53 mutations were found to occur, but at a low frequency (4 of 25). While all four mutations were identified by single strand conformation polymorphism, the comparative sensitivity of RNase protection was 50% (2 of 4). Heterozygosity was retained at mutated codons in 3 of 4 cases. One pedigree was consistent with the Li-Fraumeni syndrome, and bone marrow from both diagnosis and remission indicated a germline G to T transversion at codon 272 (valine to leucine). Although members of another family were affected with leukemia, a 2-bp deletion in exon 6 was nonhereditary. The other two nonhereditary p53 mutations included a T to G transversion at codon 270 (phenylalanine to cysteine) and a G to C transversion at codon 248 (arginine to proline). These data support the role of both hereditary and acquired p53 mutations in the pathogenesis and/or progression of some cases of childhood acute lymphoblastic leukemia. C1 NCI,PEDIAT BRANCH,BETHESDA,MD 20892. NCI,USN,MED ONCOL BRANCH,BETHESDA,MD 20892. NCI,MED BRANCH,BETHESDA,MD 20892. CHILDRENS HOSP,NATL MED CTR,DIV HEMATOL ONCOL,WASHINGTON,DC 20010. GEORGE WASHINGTON UNIV,SCH MED,DEPT PEDIAT,WASHINGTON,DC 20010. UNIV TEXAS,HLTH SCI CTR,SW MED SCH,SIMMONS CANC CTR,DALLAS,TX 75235. RI Takahashi, Takashi/I-7262-2014; OI Mitsudomi, Tetsuya/0000-0001-9860-8505 NR 52 TC 95 Z9 98 U1 0 U2 1 PU ROCKEFELLER UNIV PRESS PI NEW YORK PA 1114 FIRST AVE, 4TH FL, NEW YORK, NY 10021 SN 0021-9738 J9 J CLIN INVEST JI J. Clin. Invest. PD FEB PY 1992 VL 89 IS 2 BP 640 EP 647 DI 10.1172/JCI115630 PG 8 WC Medicine, Research & Experimental SC Research & Experimental Medicine GA HD270 UT WOS:A1992HD27000039 PM 1737852 ER PT J AU LAL, RB BRODINE, S KAZURA, J MBIDDEKATONGA, E YANAGIHARA, R ROBERTS, C AF LAL, RB BRODINE, S KAZURA, J MBIDDEKATONGA, E YANAGIHARA, R ROBERTS, C TI SENSITIVITY AND SPECIFICITY OF A RECOMBINANT TRANSMEMBRANE GLYCOPROTEIN (RGP21)-SPIKED WESTERN IMMUNOBLOT FOR SEROLOGICAL CONFIRMATION OF HUMAN T-CELL LYMPHOTROPIC VIRUS TYPE-I AND TYPE-II INFECTIONS SO JOURNAL OF CLINICAL MICROBIOLOGY LA English DT Article ID ANTIBODY REACTIVITY; ENVELOPE PROTEIN; HTLV; SEQUENCE; PEPTIDE; DONORS; ASSAYS; BLOOD AB Serum specimens (n = 2,712) obtained from individuals residing in diverse geographic regions and categorized as seropositve (n = 122), seroindeterminate (n = 523), or seronegative (n = 2,067) for human T-cell lymphotropic virus (HTLV) infection in accordance with U.S. Public Health Service guidelines were retested by recombinant transmembrane protein (rgp21)-spiked Western immunoblotting. Of the 122 HTLV-positive specimens, those from 85 of 85 (100%) U.S. blood donors, 2 of 2 (100%) Brazilians, 1 of 2 (50%) Indonesians, 14 of 14 (100%) Solomon Islanders, and 18 of 19 (95%) Papua New Guineans reacted with rgp21, yielding an overall sensitivity of 98% (120 of 122). Specimens from individuals whose infections were confirmed to be HTLV type I or HTLV type II by the polymerase chain reaction assay reacted equally well with rgp21. Of the 523 HTLV-indeterminate specimens, those from 21 of 379 (5.5%) U.S. blood donors, 3 of 6 (50%) Brazilians, 10 of 23 (44%) Ugandans, 8 of 49 (16%) Indonesians, 4 of 36 (11%) Solomon Islanders, and 5 of 30 (17%) Papua New Guineans reacted with rgp21. None of these 51 specimens reacted with native gp46 and/or gp61/68 in a radioimmunoprecipitation assay, suggesting a false-positive reaction (9.75%). Of the 2,067 HTLV-negative specimens, 12 reacted with rgp21, yielding a false-positivity rate of 0.6%. These data indicate that while detection of rgp21 is highly sensitive, it can yield false-positive results. Thus, specimens exhibiting reactivity with rgp21 in the absence of reactivity with native gp46 and/or gp61/68 by Western blot should be tested further by a radioimmunoprecipitation assay to verify HTLV type I or type II infection. C1 USN,HLTH RES CTR,DIV INFECT DIS,SAN DIEGO,CA 92132. CASE WESTERN RESERVE UNIV,DEPT MED,DIV GEOG MED,CLEVELAND,OH 44106. MAKERERE UNIV,UGANDA CANC INST,KAMPALA,UGANDA. NINCDS,CENT NERVOUS SYST STUDIES LAB,BETHESDA,MD 20892. WALTER REED ARMY MED CTR,DEPT DIAGNOST RETORVIROL,WASHINGTON,DC 20307. RP LAL, RB (reprint author), CTR DIS CONTROL,CTR INFECT DIS,DIV VIRAL & RICKETTSIAL DIS,RETROVIRUS DIS BRANCH,ATLANTA,GA 30333, USA. NR 25 TC 43 Z9 45 U1 0 U2 0 PU AMER SOC MICROBIOLOGY PI WASHINGTON PA 1325 MASSACHUSETTS AVENUE, NW, WASHINGTON, DC 20005-4171 SN 0095-1137 J9 J CLIN MICROBIOL JI J. Clin. Microbiol. PD FEB PY 1992 VL 30 IS 2 BP 296 EP 299 PG 4 WC Microbiology SC Microbiology GA HA100 UT WOS:A1992HA10000007 PM 1347047 ER PT J AU OLSEN, RC AF OLSEN, RC TI THE DENSITY MINIMUM AT THE EARTHS MAGNETIC EQUATOR SO JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS LA English DT Article; Proceedings Paper CT WORKSHOP ON PLASMASPHERE REFILLING CY OCT 15-16, 1990 CL UNIV ALABAMA, HUNTSVILLE, AL HO UNIV ALABAMA ID OUTER PLASMASPHERE; BULGE; PLASMAPAUSE; BEHAVIOR; PHASE AB Observations of the density structure in the plasmapause region reveal the existence of a local minimum in the total electron density at the magnetic equator. Data from the plasma wave instrument and ion mass spectrometer on the Dynamics Explorer (DE) 1 satellite are used to study this phenomenon. The density depletion typically extends from +/- 5-degrees to +20-degrees in latitude and is found at altitudes from 2 to 5 R(E). Density depletions of 10-70% are found in regions where the off-equator density ranges from 10 to 1000 cm-3. This density structure is associated with equator crossings where the thermal plasma has been heated over normal plasmasphere values. The heated plasma is the equatorially trapped plasma previously reported from DE 1 and the SCATHA satellite. Within the plasmasphere, the drop in total (electron) density corresponds to a decrease in the cold-ion density, in both H-1 and He-1. There is a rough pressure balance provided by the warm tail of the distribution, which is a few percent by density but 1-2 orders of magnitude higher in temperature. 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 24 TC 16 Z9 16 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 FEB 1 PY 1992 VL 97 IS A2 BP 1135 EP 1150 DI 10.1029/91JA02719 PG 16 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA HB870 UT WOS:A1992HB87000007 ER PT J AU HUBA, JD CHEN, J ANDERSON, RR AF HUBA, JD CHEN, J ANDERSON, RR TI ELECTROSTATIC TURBULENCE IN THE EARTHS CENTRAL PLASMA SHEET PRODUCED BY MULTIPLE-RING ION DISTRIBUTIONS SO JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS LA English DT Article ID DISTANT GEOMAGNETIC TAIL; INSTABILITIES DRIVEN; VELOCITY RING; BOW SHOCK; MAGNETOTAIL; GENERATION; NOISE; WAVES; DYNAMICS; ISEE-3 AB A mechanism to generate a broad spectrum of electrostatic turbulence in the quiet time central plasma sheet (CPS) plasma is discussed. We show theoretically that multiple-ring ion distributions can generate short-wavelength (k-lambda(dc) less-than-or-equal-to 1), electrostatic turbulence with frequencies omega less-than-or-equal-to kV(j), where V(j) is the velocity of the jth ring. Using a set of parameters from measurements made in the CPS, we find that electrostatic turbulence can be generated with wavenumbers 10(-2) less-than-or-equal-to k-lambda(de) less-than-or-equal-to 1.0, and with real frequencies in the range 0 < omega(r)/omega(pi) < 10, and linear growth rates gamma/omega(pi) > 0.01 over a broad range of angles relative to the magnetic field (5-degrees < theta less-than-or-equal-to 90-degrees). The fastest growing modes are caused by an ion ring drift instability and occur for nearly parallel propagating modes (5-degrees < theta < 10-degrees) with omega(r) less-than-or-equal-to omega(pi) at wavelengths comparable to the electron Debye length. We also find that lower hybrid waves and electron cyclotron waves can be excited for nearly perpendicular propagating modes (theta approximately 90-degrees). We compare these theoretical results with wave data from ISEE I using an ion distribution function exhibiting multiple-ring structures observed at the same time. The theoretical results in the linear regime are found to be consistent with the wave data. Finally, we discuss these results in relation to nonlinear particle dynamics in the CPS which can generate the multiple-ring ion distributions. C1 UNIV IOWA,DEPT PHYS & ASTRON,IOWA CITY,IA 52242. RP HUBA, JD (reprint author), USN,RES LAB,DIV PLASMA PHYS,SPACE PLASMA BRANCH,4780 269,4555 OVERLOOK AVE SW,WASHINGTON,DC 20375, USA. NR 23 TC 6 Z9 6 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 1992 VL 97 IS A2 BP 1533 EP 1540 DI 10.1029/91JA02582 PG 8 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA HB870 UT WOS:A1992HB87000040 ER PT J AU KIRSHENBAUM, AS GOFF, JP KESSLER, SW MICAN, JM ZSEBO, KM METCALFE, DD AF KIRSHENBAUM, AS GOFF, JP KESSLER, SW MICAN, JM ZSEBO, KM METCALFE, DD TI EFFECT OF IL-3 AND STEM-CELL FACTOR ON THE APPEARANCE OF HUMAN BASOPHILS AND MAST-CELLS FROM CD34+ PLURIPOTENT PROGENITOR CELLS SO JOURNAL OF IMMUNOLOGY LA English DT Article ID C-KIT RECEPTOR; GROWTH-FACTOR; BONE-MARROW; SI-LOCUS; MOUSE; FIBROBLASTS; LIGAND; RAT; KINASE AB Hemopoietic stem cell factor (SCF), which is the ligand for the proto-oncogene c-kit receptor (allelic with W locus) and the product of Sl locus of the mouse, has recently been cloned. The human homologue has also been cloned, and recombinant protein (human rSCF) expressed and purified to homogeneity. To determine the effect of human rSCF in the presence or absence of human rIL-3 on human bone marrow-derived mast cells and basophils, human CD34+ pluripotent progenitor cells, highly enriched (> 99%) from bone marrow mononuclear cells, were cultured over agarose surfaces (interphase cultures) in the presence of human rIL-3, human rIL-3 and increasing concentrations of human rSCF, or human rSCF alone. Over 3 to 4 wk, human rSCF acted synergistically with human rIL-3 at all concentrations, producing a three- to fivefold increase in total, mast cell, and basophil numbers over human rIL-3 alone when used at 100 ng/ml. The percentage of cell types in the human rIL-3 and human rIL-3 plus human rSCF cultures, however, remained the same, with basophils constituting 18 to 35% of the final cultured cells, and mast cells 3% or less of the final cell number. In the presence of human rSCF alone, the combined total percentage of mast cells and basophils was 0 to 1.0%, the majority of cells being macrophages. Mast cells cultured in human rIL-3 plus human rSCF, but not human rIL-3 alone, were berberine sulfate positive, suggesting the presence of heparin proteoglycans within granules. Electron microscopic examination of cultures supplemented with human rIL-3 and rSCF, but not human rIL-3 alone, revealed that after 3 wk in culture, mast cell granules contained tryptase and exhibited scroll, reticular, and homogeneous patterns as seen previously in CD34+/3T3 fibroblast cocultures. Thus, CD34+ cells cultured in the presence of both human rIL-3 and rSCF give rise to cultures containing increased numbers of basophils and mast cells, with the mast cells by ultrastructural studies showing evidence of maturation although the percentages of basophils and mast cells arising in these cultures remained unchanged. C1 HOMEWOOD HOSP,DEPT MED,DIV ALLERGY,BALTIMORE,MD 21211. GEORGETOWN UNIV,MED CTR,DIV MOLEC VIROL & IMMUNOL,ROCKVILLE,MD 20852. USN,IMMUNE CELL BIOL PROGRAM,BETHESDA,MD 20889. AMGEN INC,THOUSAND OAKS,CA 91320. RP KIRSHENBAUM, AS (reprint author), NIAID,MAST CELL PHYSIOL SECT,CLIN INVEST LAB,BLDG 10,ROOM 11C212,BETHESDA,MD 20892, USA. NR 24 TC 254 Z9 256 U1 0 U2 3 PU AMER ASSOC IMMUNOLOGISTS PI BETHESDA PA 9650 ROCKVILLE PIKE, BETHESDA, MD 20814 SN 0022-1767 J9 J IMMUNOL JI J. Immunol. PD FEB 1 PY 1992 VL 148 IS 3 BP 772 EP 777 PG 6 WC Immunology SC Immunology GA HB535 UT WOS:A1992HB53500017 PM 1370517 ER PT J AU CHEINGSONGPOPOV, R CALLOW, D BEDDOWS, S SHAUNAK, S WASI, C KALEEBU, P GILKS, C PETRASCU, IV GARAEV, MM WATTS, DM CONSTANTINE, NT WEBER, JN AF CHEINGSONGPOPOV, R CALLOW, D BEDDOWS, S SHAUNAK, S WASI, C KALEEBU, P GILKS, C PETRASCU, IV GARAEV, MM WATTS, DM CONSTANTINE, NT WEBER, JN TI GEOGRAPHIC DIVERSITY OF HUMAN-IMMUNODEFICIENCY-VIRUS TYPE-1 - SEROLOGIC REACTIVITY TO ENV EPITOPES AND RELATIONSHIP TO NEUTRALIZATION SO JOURNAL OF INFECTIOUS DISEASES LA English DT Article ID MONOCLONAL-ANTIBODIES; ENVELOPE; SEQUENCE; GP120; GLYCOPROTEIN; STRAINS; PEPTIDE; ISOLATE; CELLS AB The antibody recognition of the major neutralization epitopes of human immunodeficiency virus type 1 (HIV-1) in 829 HIV-1-seropositive subjects from North America (106), Europe (241), Africa (342), and Asia (100) was investigated. Peptides derived from diverse published V3 loop sequences were used as antigen, and serum reactivity was detected by sensitive ELISAs. Antibody binding to peptides derived from the V3 loop sequence of HIV-1 isolates varies considerably depending on the geographic origin of the antibody and is associated with neutralization titer against homologous isolates. Serotype reactivity to pepides may be a simple and rapid approach to investigation of HIV-1 env diversity worldwide and may assist the choice of immunogen for development of future AIDS vaccines. C1 ST MARYS HOSP,SCH MED,DEPT GENITOURINARY MED,JEFFERISS RES WING,PRAED ST,LONDON W2 1NY,ENGLAND. SIRIRAJ HOSP,FAC MED,DEPT MICROBIOL,DIV VIROL,WHO COLLABORATING CTR AIDS,BANGKOK 7,THAILAND. UGANDA VIRUS RES INST,ENTEBBE,UGANDA. KENYA GOVT MED RES CTR,WELLCOME TRUST RES LABS,NAIROBI,KENYA. ROMANIAN AIDS ASSOC,BUCHAREST,ROMANIA. DI IVANOVSKII VIROL INST,DEPT MOLEC BIOL,MOSCOW,USSR. USN,MED RES UNIT 3,DIV VIROL,WHO AIDS COLLABORATING CTR,CAIRO,EGYPT. UNIV MARYLAND,SCH MED,DEPT PATHOL,BALTIMORE,MD 21201. RI Gilks, Charles/B-4184-2012 FU Wellcome Trust NR 20 TC 51 Z9 51 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 FEB PY 1992 VL 165 IS 2 BP 256 EP 261 PG 6 WC Immunology; Infectious Diseases; Microbiology SC Immunology; Infectious Diseases; Microbiology GA HF387 UT WOS:A1992HF38700009 PM 1370525 ER PT J AU HOWERTON, MM BURNS, WK AF HOWERTON, MM BURNS, WK TI PHOTOREFRACTIVE EFFECTS IN PROTON EXCHANGED LITAO3 OPTICAL WAVE-GUIDES SO JOURNAL OF LIGHTWAVE TECHNOLOGY LA English DT Article ID WAVE-GUIDES; LINBO3; MODULATORS; DEVICES AB A circuit model is proposed to describe photorefractive effects in LiNbO3/LiTaO3 channel waveguides at any intensity level. Capacitive charge storage at the waveguide boundaries is assumed to be provided by trapping states associated with photoconductivity. A consequence of this model is that photoconductive transients are independent of optical intensity at low intensity levels. Photovoltaic and photoconductive effects in proton exchanged LiTaO3 channel waveguides were experimentally investigated. Dark conductivities of 2 x 10(-15) to 2 x 10(-14) (OMEGA - cm)-1 were extrapolated from photoconductivities up to 2 x 10(-13) (OMEGA - cm)-1 for power levels of 0.1 to 3 mW. Large dc voltage dependent effects on the conductivity were observed. Straight channel waveguides were observed to be free of photovoltaic effects for output power levels below 35-75 mW. C1 USN,RES LAB,WASHINGTON,DC 20375. RP HOWERTON, MM (reprint author), SFA INC,LANDOVER,MD, USA. NR 11 TC 12 Z9 12 U1 0 U2 2 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0733-8724 J9 J LIGHTWAVE TECHNOL JI J. Lightwave Technol. PD FEB PY 1992 VL 10 IS 2 BP 142 EP 149 DI 10.1109/50.120568 PG 8 WC Engineering, Electrical & Electronic; Optics; Telecommunications SC Engineering; Optics; Telecommunications GA HF700 UT WOS:A1992HF70000005 ER PT J AU DELMORAL, A SCHWEIZER, J ARNAUDAS, JI SALAMON, MB RITTER, C JOVEN, E GEHRING, PM ALGARABEL, PA CULLEN, J AF DELMORAL, A SCHWEIZER, J ARNAUDAS, JI SALAMON, MB RITTER, C JOVEN, E GEHRING, PM ALGARABEL, PA CULLEN, J TI FERROMAGNETIC, QUASIFERROMAGNETIC AND ANTIFERROMAGNETIC SPIN-GLASS ORDERS IN RANDOM ANISOTROPY CRYSTALLINE DYXY1-XAL2 COMPOUNDS SO JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS LA English DT Article ID SUSCEPTIBILITY; MAGNETS AB The nature of the different kinds of magnetic order in the magnetic phase diagram (MPD) of the cubic DyxY1-xAl2 weak random magnetic anisotropy series is clarified. At the spin-glass side of the MPD the system is formed by ''antiferromagnetic spin-glass'' clusters, with random-sign pair correlations (congruent-to 25 angstrom size), with randomized net magnetic moments, but correlated over long distances (almost-equal-to 10(3) angstrom) (cluster-glass). At the quasiferromagnetic side, ferromagnetic-like Bragg peaks persist down to x = 0.40, but a first-order phase transition at x congruent-to 0.625 signals the borderline for existence of good ferromagnetic order. C1 CSIC, ZARAGOZA, SPAIN. UNIV SARAGOSSA, ICMA, ZARAGOZA, SPAIN. CEN, F-38041 GRENOBLE, FRANCE. UNIV ILLINOIS, DEPT PHYS, URBANA, IL 61801 USA. UNIV ILLINOIS, MRL, URBANA, IL 61801 USA. INST MAX VON LAUE PAUL LANGEVIN, F-38042 GRENOBLE, FRANCE. BROOKHAVEN NATL LAB, UPTON, NY 11973 USA. USN, CTR SURFACE WEAP, SILVER SPRING, MD 20910 USA. RP DELMORAL, A (reprint author), UNIV SARAGOSSA, DFMC, MAGNETISM LAB, ZARAGOZA, SPAIN. RI Algarabel, Pedro/K-8583-2014; Arnaudas, Jose/B-4702-2008 OI Algarabel, Pedro/0000-0002-4698-3378; Arnaudas, Jose/0000-0002-2624-6004 NR 8 TC 2 Z9 2 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0304-8853 J9 J MAGN MAGN MATER JI J. Magn. Magn. Mater. PD FEB PY 1992 VL 104 BP 243 EP 245 DI 10.1016/0304-8853(92)90782-J PN 1 PG 3 WC Materials Science, Multidisciplinary; Physics, Condensed Matter SC Materials Science; Physics GA HH326 UT WOS:A1992HH32600108 ER PT J AU IDO, H KONNO, K ITO, T CHENG, SF SANKAR, SG WALLACE, WE AF IDO, H KONNO, K ITO, T CHENG, SF SANKAR, SG WALLACE, WE TI MAGNETIC-PROPERTIES OF RCO4M (R = Y, ND AND HO-M = B, AL AND GA)-II SO JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS LA English DT Article; Proceedings Paper CT INTERNATIONAL CONF ON MAGNETISM CY SEP 02-06, 1991 CL EDINBURGH, SCOTLAND ID RARE-EARTH; ANISOTROPY AB Magnetic measurements for RCo4M (M = B, Al and Ga; R = Y, Nd and Ho) have been done in order to compare the M-substitution effects on the magnetic properties of RCo5. In the case of M = B, the crystal structure is of CeCo4B-type, while in the case of M = Al and Ga, it is of CaCu5-type. By the B substitution for the Co of RCo5 the magnetic anisotropy of the R sublattice is enhanced for R = Nd, while it seems to be weakened for R = Ho. The Co and R sublattice magnetizations and the exchange interaction between them are also discussed. C1 CARNEGIE MELLON UNIV,MEMS DEPT,PITTSBURGH,PA 15213. USN,CTR SURFACE WEAP,SILVER SPRING,MD 20903. RP IDO, H (reprint author), TOHOKU GAKUIN UNIV,DEPT APPL PHYS,TAGAJO,MIYAGI 985,JAPAN. NR 15 TC 10 Z9 11 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 FEB PY 1992 VL 104 BP 1361 EP 1362 DI 10.1016/0304-8853(92)90619-Y PN 2 PG 2 WC Materials Science, Multidisciplinary; Physics, Condensed Matter SC Materials Science; Physics GA HH327 UT WOS:A1992HH32700271 ER PT J AU CLARK, AE CHENG, SF TETER, JP WUNFOGLE, M HUANG, MQ ZHENG, Y AF CLARK, AE CHENG, SF TETER, JP WUNFOGLE, M HUANG, MQ ZHENG, Y TI EFFECT OF NITROGENATION ON THE MAGNETOSTRICTION OF Y2FE17, PR2FE17 AND ND2FE17 SO JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS LA English DT Article; Proceedings Paper CT INTERNATIONAL CONF ON MAGNETISM CY SEP 02-06, 1991 CL EDINBURGH, SCOTLAND ID MAGNETIC-PROPERTIES; RARE AB Magnetostriction measurements on nitrogenated Y2Fe17, Pr2Fe17, and Nd2Fe17 from cryogenic temperatures to 300 K yield surprising results. Even though Curie temperatures, magnetizations and magnetic anisotropies of the R2Fe17 compounds (R = Y, Pr, Nd) are all substantially increased by nitrogenation, the magnetostrictions are frequently unchanged or reduced. In Pr2Fe17, a large reduction in the magnetostriction is observed. In Nd2Fe17, Y2Fe17, and all nitrogenated samples, the magnetostriction is positive at high temperatures and decreases with decreasing temperature at low temperatures, revealing a strong negative basal plane lambda(gamma,2) constant in a background of a positive average magnetostriction. C1 CARNEGIE MELLON UNIV,PITTSBURGH,PA 15213. RP CLARK, AE (reprint author), USN,CTR SURFACE WARFARE,SILVER SPRING,MD 20903, USA. NR 5 TC 10 Z9 10 U1 2 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 FEB PY 1992 VL 104 BP 1433 EP 1434 DI 10.1016/0304-8853(92)90651-4 PN 2 PG 2 WC Materials Science, Multidisciplinary; Physics, Condensed Matter SC Materials Science; Physics GA HH327 UT WOS:A1992HH32700303 ER PT J AU SPANO, ML LYNN, HD WUNFOGLE, M AF SPANO, ML LYNN, HD WUNFOGLE, M TI BASAL-PLANE MAGNETOSTRICTION AND ANISOTROPY OF (TB0.5DY0.5)XGD100-X SINGLE-CRYSTALS SO JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS LA English DT Article; Proceedings Paper CT INTERNATIONAL CONF ON MAGNETISM CY SEP 02-06, 1991 CL EDINBURGH, SCOTLAND AB The effect of adding Gd to the binary alloy Tb0.5Dy0.5 has been studied via magnetostriction and differential scanning calorimetry measurements for concentrations of Gd of 40 and 60%. The two lowest-order magnetostriction constants were determined, as was the basal plane anisotropy. We report the anisotropy compensation temperatures as a function of Gd concentration, as well as the Curie and Neel temperatures, where present. These data are examined in conjunction with previous data taken on alloys with Gd concentrations of 0 and 20%. RP SPANO, ML (reprint author), USN,CTR SURFACE WARFACE,CODE R43,10901 NEW HAMPSHIRE AVE,SILVER SPRING,MD 20903, USA. RI Spano, Mark/B-6883-2011 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 0304-8853 J9 J MAGN MAGN MATER JI J. Magn. Magn. Mater. PD FEB PY 1992 VL 104 BP 1537 EP 1539 DI 10.1016/0304-8853(92)91444-X PN 3 PG 3 WC Materials Science, Multidisciplinary; Physics, Condensed Matter SC Materials Science; Physics GA HH328 UT WOS:A1992HH32800024 ER PT J AU MORUP, S CHRISTIANSEN, G KOON, NC AF MORUP, S CHRISTIANSEN, G KOON, NC TI MAGNETIC-RELAXATION EFFECTS IN FE/AG(100) MULTILAYERS SO JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS LA English DT Article; Proceedings Paper CT INTERNATIONAL CONF ON MAGNETISM CY SEP 02-06, 1991 CL EDINBURGH, SCOTLAND ID CONVERSION ELECTRON MOSSBAUER; SPIN ORIENTATIONS; HYPERFINE FIELDS; SUPERLATTICES; SPECTRA AB Mossbauer spectra of Fe/Ag(100) superlattice films have been analysed using a model for interacting magnetic clusters (superferromagnetism). It is found that the temperature dependence of the order parameter, deduced from the spectra, is in good agreement with the model. C1 USN,RES LAB,WASHINGTON,DC 20375. RP MORUP, S (reprint author), TECH UNIV DENMARK,APPL PHYS LAB,DK-2800 LYNGBY,DENMARK. RI morup, steen/A-7944-2011 OI morup, steen/0000-0001-6074-1634 NR 8 TC 5 Z9 5 U1 0 U2 0 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 FEB PY 1992 VL 104 BP 1793 EP 1794 DI 10.1016/0304-8853(92)91552-5 PN 3 PG 2 WC Materials Science, Multidisciplinary; Physics, Condensed Matter SC Materials Science; Physics GA HH328 UT WOS:A1992HH32800132 ER PT J AU HATHAWAY, KB CULLEN, JR AF HATHAWAY, KB CULLEN, JR TI A FREE-ELECTRON MODEL FOR THE EXCHANGE COUPLING OF FERROMAGNETS THROUGH PARAMAGNETIC METALS SO JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS LA English DT Article; Proceedings Paper CT INTERNATIONAL CONF ON MAGNETISM CY SEP 02-06, 1991 CL EDINBURGH, SCOTLAND ID MAGNETORESISTANCE AB A mechanism for the coupling of two ferromagnetic films separated by a metallic paramagnetic film is derived. The coupling oscillates in sign as a function of the thickness of the paramagnetic layer, with the long range period of the oscillation determined by the Fermi wavevector for the paramagnet as in RKKY. However unlike RKKY both the magnitude of the coupling and its detailed behavior at small separations depend on the exchange splitting of the ferromagnets. A comparison with the experimental data for Fe/Cr, Co/Ru and Co/Cu is given. RP HATHAWAY, KB (reprint author), USN,CTR SURFACE WARFARE,SILVER SPRING,MD 20903, USA. NR 9 TC 47 Z9 47 U1 1 U2 1 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 FEB PY 1992 VL 104 BP 1840 EP 1842 DI 10.1016/0304-8853(92)91572-B PN 3 PG 3 WC Materials Science, Multidisciplinary; Physics, Condensed Matter SC Materials Science; Physics GA HH328 UT WOS:A1992HH32800152 ER PT J AU SUBRAHMANYAM, MB AF SUBRAHMANYAM, MB TI OPTIMAL DISTURBANCE REJECTION AND PERFORMANCE ROBUSTNESS IN LINEAR-SYSTEMS SO JOURNAL OF MATHEMATICAL ANALYSIS AND APPLICATIONS LA English DT Article ID INTEGRAL-INEQUALITIES; EQUATION RP SUBRAHMANYAM, MB (reprint author), USN,CTR AIR DEV,FLIGHT CONTROL,CODE 6012,WARMINSTER,PA 18974, USA. NR 19 TC 7 Z9 7 U1 0 U2 0 PU ACADEMIC PRESS INC JNL-COMP SUBSCRIPTIONS PI SAN DIEGO PA 525 B ST, STE 1900, SAN DIEGO, CA 92101-4495 SN 0022-247X J9 J MATH ANAL APPL JI J. Math. Anal. Appl. PD FEB PY 1992 VL 164 IS 1 BP 130 EP 150 DI 10.1016/0022-247X(92)90149-8 PG 21 WC Mathematics, Applied; Mathematics SC Mathematics GA HD197 UT WOS:A1992HD19700010 ER PT J AU WU, CT AF WU, CT TI FASTER PROGRAM-DEVELOPMENT WITH ACTOR 4.0S WDL AND ACTION METHODS SO JOURNAL OF OBJECT-ORIENTED PROGRAMMING LA English DT Article C1 USN,POSTGRAD SCH,DEPT COMP SCI,MONTEREY,CA 93943. NR 0 TC 0 Z9 0 U1 0 U2 0 PU SIGS PUBLICATIONS INC PI NEW YORK PA 588 BROADWAY SUITE 604, NEW YORK, NY 10012-5408 SN 0896-8438 J9 J OBJECT-ORIENT PROG JI J. Object-Oriented Program. PD FEB PY 1992 VL 4 IS 9 BP 54 EP 60 PG 7 WC Computer Science, Software Engineering; Computer Science, Theory & Methods SC Computer Science GA HC999 UT WOS:A1992HC99900009 ER PT J AU RIVIERE, GR ELLIOT, KS ADAMS, DF SIMONSON, LG FORGAS, LB NILIUS, AM LUKEHART, SA AF RIVIERE, GR ELLIOT, KS ADAMS, DF SIMONSON, LG FORGAS, LB NILIUS, AM LUKEHART, SA TI RELATIVE PROPORTIONS OF PATHOGEN-RELATED ORAL SPIROCHETES (PROS) AND TREPONEMA-DENTICOLA IN SUPRAGINGIVAL AND SUBGINGIVAL PLAQUE FROM PATIENTS WITH PERIODONTITIS SO JOURNAL OF PERIODONTOLOGY LA English DT Article DE MONOCLONAL ANTIBODIES; TREPONEMA-DENTICOLA; DENTAL PLAQUE MICROBIOLOGY; SPIROCHETES; PERIODONTITIS ETIOLOGY ID MONOCLONAL-ANTIBODIES; DISEASE; BACTERIA; SEVERITY; HEALTHY; HUMANS AB THE PURPOSE OF THIS STUDY was to use monoclonal antibodies to enumerate spirochetes in dental plaque, including the newly recognized pathogen-related oral spirochete (PROS) and specific serovars of Treponema denticola. Plaque was collected from control subjects with no apparent periodontal disease and from sites of moderate to severe chronic periodontitis in patients with inflammatory periodontal disease. Individual monoclonal antibodies were used to determine whether spirochetes were present and then a double-staining protocol was employed to count total spirochetes and specific treponemes in individual microscopic fields. Results indicate that spirochetes are more common at diseased sites and in subgingival plaque than at healthy sites or in supragingival plaque. Together PROS and T. denticola comprised the majority of all spirochetes in all samples and PROS and T. denticola serovars "B" and D were most numerous in plaque from patients with periodontitis. PROS were the majority of all spirochetes in supragingival plaque (76.2% +/- 23.8%) and subgingival plaque (60.9% +/- 19.1%) from periodontitis patients, significantly larger than the percentage of T. denticola serovar "B" (P < .001 for both supragingival and subgingival plaque) and serovar D (P < .01 for supragingival and P < .001 for subgingival plaque). These observations indicate that PROS are the predominant spirochete in plaque from sites of patients with periodontitis, but other analytical approaches are necessary to determine if PROS or T. denticola are pathogenic. C1 UNIV WASHINGTON,SCH MED,DEPT MED,SEATTLE,WA 98195. USN,DENT RES INST,GREAT LAKES,IL 60088. USN,DEPT PERIODONTOL,GREAT LAKES,IL 60088. RP RIVIERE, GR (reprint author), OREGON HLTH SCI UNIV,DEPT PEDIAT DENT,611 SW CAMPUS DR,PORTLAND,OR 97201, USA. FU NIAID NIH HHS [AI18988] NR 20 TC 50 Z9 51 U1 0 U2 1 PU AMER ACAD PERIODONTOLOGY PI CHICAGO PA 737 NORTH MICHIGAN AVENUE, SUITE 800, CHICAGO, IL 60611-2690 SN 0022-3492 J9 J PERIODONTOL JI J. Periodont. PD FEB PY 1992 VL 63 IS 2 BP 131 EP 136 PG 6 WC Dentistry, Oral Surgery & Medicine SC Dentistry, Oral Surgery & Medicine GA HD751 UT WOS:A1992HD75100010 PM 1372653 ER PT J AU AHLERS, ST WEISSMAN, BA BARRETT, JE AF AHLERS, ST WEISSMAN, BA BARRETT, JE TI ANTAGONISM STUDIES WITH BMY-7378 AND NAN-190 - EFFECTS ON 8-HYDROXY-2-(DI-NORMAL-PROPYLAMINO)TETRALIN-INDUCED INCREASES IN PUNISHED RESPONDING OF PIGEONS SO JOURNAL OF PHARMACOLOGY AND EXPERIMENTAL THERAPEUTICS LA English DT Article ID ANXIOLYTIC DRUGS; 5-HT1A RECEPTORS; STIMULUS PROPERTIES; AGONIST; BUSPIRONE; 8-OH-DPAT; BEHAVIOR; SUBTYPES; RATS AB The purported serotonin (5-HT)1A antagonists BMY-7378 and NAN-190 were examined in pigeons for their potential to block the effects of the prototypical 5-HT1A agonist 8-hydroxy-2-(di-n-propylamino)tetralin (8-OH-DPAT) on punished (''conflict'') and unpunished behavior and for their binding affinity at the 5-HT1A receptor site labeled by [H-3]-8-OH-DPAT. Although BMY-7378 and NAN-190 both displayed high affinity for the 5-HT1A receptor (IC-50 values of 0.8 and 7.5 nM, respectively), their effects, when administered alone, as well as in combination with 8-OH-DPAT, were distinct. 8-OH-DPAT (0.3-3.0 mg/kg) produced large increases in punished responding at doses that did not affect or that decreased unpunished responding. Administration of NAN-190 (1.0-3.0 mg/kg) did not increase punished responding, whereas BMY-7378 (1.0-5.6 mg/kg) slightly increased behavior suppressed by punishment. Pretreatment with BMY-7378 attenuated the rate-increasing effects of 8-OH-DPAT on punished responding; however, these effects were accompanied by dose-dependent enhancement of the rate-decreasing effects of 8-OH-DPAT on unpunished responding. In contrast, NAN-190 blocked the rate-increasing effects of 8-OH-DPAT on punished responding and also reversed the rate-decreasing effects of 8-OH-DPAT on responding that was not punished. Pretreatment with NAN-190 failed to block increases in punished responding produced by 0.1 to 1.0 mg/kg of the benzodiazepine midazolam. These data suggest that NAN-190 may be characterized as an antagonist and BMY-7378 a partial agonist with respect to 5-HT1A-induced behavioral changes observed in the conflict procedure with pigeons. C1 ISRAEL INST BIOL RES,IL-70450 NESS ZIONA,ISRAEL. UNIFORMED SERV UNIV HLTH SCI,DEPT PSYCHIAT,BETHESDA,MD 20814. RP AHLERS, ST (reprint author), USN,MED RES INST,DIV NEUROCHEM,THERMAL STRESS ADAPTAT PROGRAM,BETHESDA,MD 20889, USA. FU NIDA NIH HHS [DA-01873] NR 40 TC 19 Z9 19 U1 1 U2 1 PU WILLIAMS & WILKINS PI BALTIMORE PA 351 WEST CAMDEN ST, BALTIMORE, MD 21201-2436 SN 0022-3565 J9 J PHARMACOL EXP THER JI J. Pharmacol. Exp. Ther. PD FEB PY 1992 VL 260 IS 2 BP 474 EP 481 PG 8 WC Pharmacology & Pharmacy SC Pharmacology & Pharmacy GA HD217 UT WOS:A1992HD21700007 PM 1531359 ER PT J AU DECREDICO, MA AF DECREDICO, MA TI PRISON LIFE AMONG THE REBELS - RECOLLECTIONS OF A UNION CHAPLAIN - JERVEY,ED SO JOURNAL OF SOUTHERN HISTORY 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 SOUTHERN HISTORICAL ASSN PI ATHENS PA UNIV GEORGIA HISTORY DEPT, ATHENS, GA 30602 SN 0022-4642 J9 J SOUTHERN HIST JI J. South. Hist. PD FEB PY 1992 VL 58 IS 1 BP 151 EP 152 DI 10.2307/2210503 PG 2 WC History SC History GA HD983 UT WOS:A1992HD98300031 ER PT J AU LIM, R HACKMAN, RH AF LIM, R HACKMAN, RH TI A FORMULATION OF MULTIPLE-SCATTERING BY MANY BOUNDED OBSTACLES USING A MULTICENTERED, T-SUPERMATRIX SO JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA LA English DT Article ID ELASTIC-WAVE SCATTERING; TRANSITION MATRIX; GUIDE AB The acoustic scattering from many interacting, bounded, three-dimensional obstacles has been treated by several authors [see, for example, V. Twersky, J. Math. Phys. 8, 589 (1967) or B. Peterson and S. Strom, J. Acoust. Soc. Am. 56, 771 (1974)]. In particular, Peterson and Strom extended the single-obstacle, transition (T) matrix formalism to several obstacles (including all orders of multiple scattering) by using the translation properties of the spherical basis functions to translate the multiply scattered fields of each obstacle to a common origin. Later, their formalism was extended to treat elastic wave scattering by using spherical vector basis functions [A. Bostrom, J. Acoust. Soc. Am. 67, 399 (1980)]. However, for numerical results, the present state of development is cumbersome to apply to more than two obstacles and convergence of the rescattering matrices is sensitive to obstacle separation. In this paper, a multicentered, T-matrix formalism for acoustic and elastic wave scattering is given, based on field expansions centered on each obstacle. Like previous approaches, it also incorporates the single-obstacle T matrix and sums the multiple scattering series exactly. The result is simpler and less numerically sensitive to the separation of the obstacles. The extension of the formalism to treat the scattering from infinite systems that periodically repeat an arbitrary group of obstacles is also given. Numerical calculations based on the exact formalism for scattering from a linear array of as many as ten spherical obstacles are presented. The validity of approximating the scattered field from larger finite arrays by the field scattered from finite sections of an infinite array is considered. RP LIM, R (reprint author), USN,CTR COASTAL SYST,PHYS ACOUST BRANCH 2120,PANAMA CITY,FL 32407, USA. NR 34 TC 9 Z9 9 U1 0 U2 0 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0001-4966 J9 J ACOUST SOC AM JI J. Acoust. Soc. Am. PD FEB PY 1992 VL 91 IS 2 BP 613 EP 638 DI 10.1121/1.402523 PG 26 WC Acoustics; Audiology & Speech-Language Pathology SC Acoustics; Audiology & Speech-Language Pathology GA HC900 UT WOS:A1992HC90000006 ER PT J AU MCDONALD, BE AF MCDONALD, BE TI WEAK SHOCK INTERACTION WITH A FREE-SLIP INTERFACE AT LOW GRAZING ANGLES SO JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA LA English DT Article ID TIME-DOMAIN SOLUTION; PULSE-PROPAGATION AB Theoretical/numerical investigations with the nonlinear progressive wave equation (NPE) model predict qualitative differences between behavior of a planar weak shock and a linear acoustic wave of similar time signature incident downward at small grazing angle onto a free-slip interface between two fluids. For the linear case, the model agrees well with an appropriate analytic benchmark solution. For the nonlinear cases considered, initial conditions evolve toward (a) supercritical reflection (steady wave with no Mach stem development) or (b) subcritical reflection (self-similar behavior with Mach stem development). When the horizontal phase speed c(o) of the incident wave barely exceeds the linear sound speed c(L) of the lower medium, an intermediate state can be obtained in which the incident shock discontinuity terminates on the interface; wave energy below the interface runs ahead and reforms a deep penetrating shock ahead of and below the interface disturbance. When c(o) is below c(L), the shock discontinuity terminates at the interface and does not reform in the lower medium. RP MCDONALD, BE (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 16 TC 4 Z9 4 U1 0 U2 0 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0001-4966 J9 J ACOUST SOC AM JI J. Acoust. Soc. Am. PD FEB PY 1992 VL 91 IS 2 BP 718 EP 733 DI 10.1121/1.402534 PG 16 WC Acoustics; Audiology & Speech-Language Pathology SC Acoustics; Audiology & Speech-Language Pathology GA HC900 UT WOS:A1992HC90000017 ER PT J AU ATCHLEY, AA BASS, HE HOFLER, TJ LIN, HT AF ATCHLEY, AA BASS, HE HOFLER, TJ LIN, HT TI STUDY OF A THERMOACOUSTIC PRIME MOVER BELOW ONSET OF SELF-OSCILLATION SO JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA LA English DT Article ID ENGINES AB The frequency response of a thermoacoustic prime mover has been measured as a function of the mean gas pressure and temperature gradient across the prime mover stack. The quality factor Q and resonance frequency can be determined from the response. As the temperature gradient is increased, the Q increases, indicating a decrease in attenuation across the stack. At sufficiently large temperature differences (approximately 300 K), the resonator goes into self-oscillation, indicating negative attenuation. Measurements are reported for helium and argon at pressures ranging from 170-500 kPa and temperature gradients ranging from zero to that required for onset of self-oscillation. The results are explained in terms of a counterpropagating, plane-wave analysis, based on techniques commonly used in porous media investigations. In general, the predictions of the analysis are in good agreement with experiment. The predictions of Q and the change in resonance frequency with mean gas pressure are within approximately 5% and 0.4% of measured values for the no temperature gradient cases. In the cases where temperature gradients are present, the agreement is quite good for the two highest mean pressures reported (370 and 500 kPa). There are some noticeable discrepancies at the lowest pressure (170 kPa). The reasons for these discrepancies are unknown. C1 UNIV MISSISSIPPI,DEPT PHYS,UNIVERSITY,MS 38677. CHUNG CHENG INST TECHNOL,TAOYUAN 33509,TAIWAN. RP ATCHLEY, AA (reprint author), USN,POSTGRAD SCH,DEPT PHYS,MONTEREY,CA 93943, USA. NR 11 TC 38 Z9 40 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 FEB PY 1992 VL 91 IS 2 BP 734 EP 743 DI 10.1121/1.402535 PG 10 WC Acoustics; Audiology & Speech-Language Pathology SC Acoustics; Audiology & Speech-Language Pathology GA HC900 UT WOS:A1992HC90000018 ER PT J AU BISHOP, GC SMITH, J AF BISHOP, GC SMITH, J TI A SCATTERING MODEL FOR NONDIFFERENTIABLE PERIODIC SURFACE-ROUGHNESS SO JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA LA English DT Article ID T-MATRIX APPROACH; SINUSOIDAL HARD WALL; SEA ICE; RAYLEIGH HYPOTHESIS; CORRUGATED SURFACE; ACOUSTIC RESPONSE; HE ATOMS; REFLECTION; DIFFRACTION; WAVES AB Ice dendrites that form when seawater freezes produce a surface with periodic roughness. This surface may be modeled by joining a concave upward semiellipse to a concave downward semiellipse and replicating this fundamental surface element to form a surface that is everywhere continuous, but is not differentiable at the points where the two ellipses are joined (i.e., the derivative is infinite). This surface is regarded as realization of the class of periodic rough surfaces that are not differentiable at a finite number of points within a period and includes surfaces that are piecewise and nonpiecewise smooth. A model is described to calculate plane-wave scattering from one-dimensional realizations of these types of surfaces. To calculate scattering from these types of surfaces for the physical parameters of interest, the integral equation formalism of Holford [J. Acoust. Soc. Am. 70, 1116-1128 (1980)] is used and the surface roughness profile is approximated by truncating its Fourier series representation. This approximation provides a continuous and differentiable representation of the surface roughness profile and is necessary to guarantee a convergent solution for the surface field that is obtained as a solution to a Fredholm integral equation of the second kind. The scattering theory of DeSanto [Radio Sci. 16, 1315-1326 (1981)] that uses Green's theorem and a modified physical optics representation of the surface field is used to determine the effect of the approximation on the surface field and scattering amplitudes in the domain in which the theory is numerically stable (This theory is not numerically stable for the physical parameters of interest.) Since this technique may be applied to any nondifferentiable surface that may be represented by a Fourier series, several nondifferentiable periodic surfaces are constructed. Numerical calculations show that the amplitudes of the plane-wave modes scattered from a continuous and nondifferentiable surface and from its truncated Fourier series representation are essentially identical over a wide range of incident grazing angles, acoustic frequencies, surface roughness, and surface types. Additionally, it is shown that when an integral equation is used to calculate scattering from a trunciated Fourier series representation of a continuous and nondifferentiable surface, scattering may be calculated from surfaces considerably rougher than those considered previously. RP BISHOP, GC (reprint author), USN,CTR UNDERWATER SYST,NEWPORT,RI 02841, USA. NR 86 TC 9 Z9 9 U1 0 U2 4 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0001-4966 J9 J ACOUST SOC AM JI J. Acoust. Soc. Am. PD FEB PY 1992 VL 91 IS 2 BP 744 EP 770 DI 10.1121/1.402536 PG 27 WC Acoustics; Audiology & Speech-Language Pathology SC Acoustics; Audiology & Speech-Language Pathology GA HC900 UT WOS:A1992HC90000019 ER PT J AU PHOTIADIS, DM AF PHOTIADIS, DM TI ANDERSON LOCALIZATION OF ONE-DIMENSIONAL WAVE-PROPAGATION ON A FLUID-LOADED PLATE SO JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA LA English DT Article ID ELASTIC STRUCTURES; VIBRATION; IRREGULARITY; SYSTEMS; MODES AB The propagation of flexural waves along a fluid-loaded plate with an irregular array of line attachments is examined. The system is shown to be equivalent to a one-dimensional chain with a nearest neighbor coupling arising from the fluid-loaded wave, and a long-range coupling due to bulk waves in the fluid. The magnitude of the long-range coupling is shown to be small compared to the nearest neighbor coupling for many applications. The irregularity will thus produce Anderson localization, at least for moderate distances. The equations of motion are numerically solved for two cases: (1) a sparse array for which the long-range coupling is expected to be negligible, and (2) a dense array for which the long-range coupling is fairly small, but not negligible. Unambiguous Anderson localization effects were observed in both cases. RP PHOTIADIS, DM (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 27 TC 24 Z9 24 U1 0 U2 3 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0001-4966 J9 J ACOUST SOC AM JI J. Acoust. Soc. Am. PD FEB PY 1992 VL 91 IS 2 BP 771 EP 780 DI 10.1121/1.402537 PG 10 WC Acoustics; Audiology & Speech-Language Pathology SC Acoustics; Audiology & Speech-Language Pathology GA HC900 UT WOS:A1992HC90000020 ER PT J AU TOLSTOY, A AF TOLSTOY, A TI LINEARIZATION OF THE MATCHED FIELD PROCESSING APPROACH TO ACOUSTIC TOMOGRAPHY SO JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA LA English DT Article ID RAY AB This paper continues the approach presented in Tolstoy et al. [J. Acoust. Soc. Am. 89, 1119-1127 (1991)] but offers a much improved inversion technique, i.e., a linearization of the problem which reformats the computations in terms of a simple nonsquare matrix inversion for an overdetermined system. This work was motivated by the desire to improve upon the speed and accuracy of the original algorithm that had a tendency to stall unpredictably [Tolstoy and Frazer, in Computational Acoustics, edited by D. Lee, A. Cakmak, and R. Vichnevetsky (North-Holland, Amsterdam, 1991)]. This work has the additional bonus that sound-speed accuracies are now an order of magnitude better than the earlier technique. In addition, calculations confirm that for simulations with white, Gaussian, uncorrelated noise the linear/Bartlett processor results are identical to those of the minimum-variance/Capon processor. Finally, optimal source-receiver configurations have been determined by exhaustively computing the condition numbers for the associated matrices in the new linear formulation. Simulation results with the new linearization plus matrix inversion scheme show that three arrays located at optimal coordinates in a 250 x 250-km ocean region with shot sources distributed around the perimeter can result in 3-D sound-speed profiles determined to accuracies better than 0.07 m/s and better than 0.03 m/s for four arrays located at optimal coordinates (assuming perfect knowledge of sound-speed profiles at source and array coordinates, no array deformations, perfect elimination of bottom interacting energy). Such accuracies are not to be expected under experimental conditions. RP TOLSTOY, A (reprint author), USN,RES LAB,DIV ACOUST,WASHINGTON,DC 20375, USA. NR 10 TC 23 Z9 25 U1 0 U2 1 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0001-4966 J9 J ACOUST SOC AM JI J. Acoust. Soc. Am. PD FEB PY 1992 VL 91 IS 2 BP 781 EP 787 DI 10.1121/1.402538 PG 7 WC Acoustics; Audiology & Speech-Language Pathology SC Acoustics; Audiology & Speech-Language Pathology GA HC900 UT WOS:A1992HC90000021 ER PT J AU BORGIOTTI, GV ROSEN, EM AF BORGIOTTI, GV ROSEN, EM TI THE STATE-VECTOR APPROACH TO THE WAVE AND POWER FLOW-ANALYSIS OF THE FORCED VIBRATIONS OF A CYLINDRICAL-SHELL .1. INFINITE CYLINDERS IN VACUUM SO JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA LA English DT Article ID STRUCTURAL NETWORKS AB The vibration induced by a time harmonic point excitation on an elastic circular cylindrical shell in vacuum and the power flow associated with it are analyzed by using a state vector technique. The forced vibration of the shell is identified by integrating a system of first-order differential equations satisfied by the state vector having ten components, five of them representing forces and moment resultants, and the other five representing linear and angular velocities at a shell location. The solution is expressed as a linear combination of "waveguide modes," solutions of the source-free problem, periodic in the circumferential coordinate, which are either attenuating or propagating in the longitudinal direction. The shell model here used is based on the assumptions of a negligible normal radial stress and of a velocity vector varying linearly within the shell thickness and includes shear deformation and rotary inertia effects. The shell two-dimensional (2-D) intensity vector has a simple expression in terms of the components of the state vector. Propagating modes having different azimuthal numbers are orthogonal; the total power flow through the shell cross section is the sum of the individual power flows associated with each waveguide mode. Several numerical examples of vibrational velocity response to point forces and uniform rings of forces, having different directions, are presented. For a point force the longitudinal power flow associated with combinations of waveguide modes is calculated in the frequency range from (close to) zero to above the first ring resonance. The intensity vector is also calculated at various points of the shell. C1 SFA INC,LANDOVER,MD. USN,RES LAB,WASHINGTON,DC 20375. RP BORGIOTTI, GV (reprint author), GEORGE WASHINGTON UNIV,DEPT ELECT ENGN & COMP SCI,WASHINGTON,DC 20052, USA. NR 21 TC 11 Z9 11 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 FEB PY 1992 VL 91 IS 2 BP 911 EP 925 DI 10.1121/1.402497 PG 15 WC Acoustics; Audiology & Speech-Language Pathology SC Acoustics; Audiology & Speech-Language Pathology GA HC900 UT WOS:A1992HC90000036 ER PT J AU MCKINNEY, CM HURDLE, BG BLUE, JE AF MCKINNEY, CM HURDLE, BG BLUE, JE TI A PROFILE OF THE ACOUSTICS COMMUNITY IN THE UNITED-STATES AND CANADA SO JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA LA English DT Article C1 USN,RES LAB,WASHINGTON,DC 20375. USN,RES LAB,ORLANDO,FL 32856. RP MCKINNEY, CM (reprint author), UNIV TEXAS,APPL RES LABS,BOX 8029,AUSTIN,TX 78713, USA. NR 0 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 0001-4966 J9 J ACOUST SOC AM JI J. Acoust. Soc. Am. PD FEB PY 1992 VL 91 IS 2 BP 1169 EP 1179 DI 10.1121/1.402643 PG 11 WC Acoustics; Audiology & Speech-Language Pathology SC Acoustics; Audiology & Speech-Language Pathology GA HC900 UT WOS:A1992HC90000062 ER PT J AU CHANG, CP CHEN, JM AF CHANG, CP CHEN, JM TI A STATISTICAL STUDY OF WINTER MONSOON COLD SURGES OVER THE SOUTH CHINA SEA AND THE LARGE-SCALE EQUATORIAL DIVERGENCE SO JOURNAL OF THE METEOROLOGICAL SOCIETY OF JAPAN LA English DT Article AB A 14-winter (1974/75-1987/88. November March) tropical global band data set is used to study the relationship between the occurrence of cold surges over the South China Sea and the variation of the 200 mb and surface tropical divergence from the western Pacific to the eastern Indian Ocean. The data are truncated by 12 empirical orthogonal function modes. A canonical correlation analysis (CCA) between the surface meridional winds over the South China sea between the surge onset and 48 h later is used to define a basic cold surge mode. This mode represents the spatial- and time-coherent variations of cold surge events and is constructed from 8 CCA modes which contain approximately half of the total variance of the surface northerly winds. Lag correlations between this mode and the surface meridional velocity, 200 mb velocity potential and surface velocity potential, respectively, are computed to examine the effect of the surges. The results show that. within 72 h of the surge onset, the anomalous surface northerlies reach 5 m/s centered in the northern South China Sea. and the anomalous southerlies reach 2 m/s over Burma. They represent about 70% and 30 % of the total variance of the local surface meridional winds in the two areas, respectively. The cold surge-related 200 mb tropical divergence variations have two centers. The primary one is located in the equatorial South China Sea between the Malay Peninsula. Sumatra and Borneo, which is about 50-degrees to the west of the long-term winter mean divergence center in the equatorial western Pacific around 155-degrees-E. The secondary center is over the Bay of Bengal. Divergence around both centers increases after the surge onset. with the primary one accounting for > 25% of the local variance after 5 days, and increasing to 40-50% if the surge lasts 7-8 days. The magnitude of the increased divergence in the equatorial South China Sea is positively correlated with the surge intensity only during the first three days, while that in the Bay of Bengal is correlated with the surge intensity throughout the surge period. At the surface. anomalous tropical convergence increases during a surge event and develops into two centers. The first one is over northwestern Borneo near the 200 mb anomalous divergence center. It probably reflects the importance of the diurnal Borneo convection system. The other surface center is in the eastern Indian Ocean south of the Bay of Bengal. At both centers the surge-related fractional variances are approximately 40% two days after the onset, and become > 50% five days after the onset. There is no indication of cold surge influences on the long-term mean divergence center in the equatorial western Pacific. RP CHANG, CP (reprint author), NAVAL POST GRAD SCH, DEPT METEOROL, MONTEREY, CA 93943 USA. NR 0 TC 16 Z9 16 U1 2 U2 2 PU METEOROLOGICAL SOC JAPAN PI TOKYO PA C/O JAPAN METEOROLOGICAL AGENCY 1-3-4 OTE-MACHI, CHIYODA-KU, TOKYO, 100-0004, JAPAN SN 0026-1165 EI 2186-9057 J9 J METEOROL SOC JPN JI J. Meteorol. Soc. Jpn. PD FEB PY 1992 VL 70 IS 1B BP 287 EP 302 PG 16 WC Meteorology & Atmospheric Sciences SC Meteorology & Atmospheric Sciences GA HQ621 UT WOS:A1992HQ62100009 ER PT J AU HANIFF, CA BUSCHER, DF AF HANIFF, CA BUSCHER, DF TI DIFFRACTION-LIMITED IMAGING WITH PARTIALLY REDUNDANT MASKS .1. INFRARED IMAGING OF BRIGHT OBJECTS SO JOURNAL OF THE OPTICAL SOCIETY OF AMERICA A-OPTICS IMAGE SCIENCE AND VISION LA English DT Article ID SPECKLE INTERFEROMETRY; ATMOSPHERIC-TURBULENCE; TRIPLE-CORRELATION; APERTURE-SYNTHESIS; CLOSURE PHASE; CALIBRATION; ALGORITHM; RECOVERY; STARS AB The utility of partially redundant pupil geometries has been studied in the context of near-infrared speckle imaging with ground-based telescopes. Using both numerical simulations and experimental data collected with a 4-m-class telescope, we find that the decrease in redundancy resulting from apodizing the telescope pupil results in an enhancement of the quality of reconstructed images at high light levels. This improvement in imaging fidelity is particularly valuable when short-term variations in the statistics of the atmosphere make the seeing calibration of speckle interferograms difficult. However, the use of an apodizing mask necessarily restricts the faintest source that can be imaged, leading to a loss in sensitivity of one to two magnitudes. For many of the brighter near-infrared astrophysical sources in the sky that have been the subject of previous speckle-imaging studies, the use of a partially redundant pupil is expected to enhance the fidelity of the imaging procedure considerably. C1 CALTECH,DIV PHYS MATH & ASTRON,PASADENA,CA 91125. UNIV SPACE RES ASSOC,WASHINGTON,DC 20024. USN,RES LAB,OBSERV OPT INTERFEROMETER PROJECT,WASHINGTON,DC 20392. NR 36 TC 30 Z9 30 U1 0 U2 2 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 FEB PY 1992 VL 9 IS 2 BP 203 EP 218 DI 10.1364/JOSAA.9.000203 PG 16 WC Optics SC Optics GA HA800 UT WOS:A1992HA80000003 ER PT J AU MAX, MD SCHREIBER, R CHERKIS, NZ AF MAX, MD SCHREIBER, R CHERKIS, NZ TI GEOLOGICAL CONTROL OF SHALLOW GAS AND POCKMARKS IN THE NORWEGIAN CHANNEL - HIGH-RESOLUTION SHALLOW SUBBOTTOM PROFILING OF SMALL-SCALE FEATURES SO MARINE GEOPHYSICAL RESEARCHES LA English DT Article DE NEOTECTONICS; SUBBOTTOM PROFILING; PARAMETRIC SONAR; GAS; POCKMARKS ID TRENCH AB High resolution bathymetric and fine-scale parametric subbottom profiling along a line to the SW of Stavanger, Norway near the NE flank of the Norwegian Channel, show pockmarks clustered over neotectonic shallow fold structures in Quaternary sediments. Detailed profiles of the pockmarks indicate that they are collapsed gas seeps, rather than being collapse structures that followed doming and breaching with a more dramatic gas burst. The gentle folding and weak structures along the margin of a Mesozoic through Cenozoic sedimentary basin are probably due to differential uplift generating light compressional strain. C1 ATLAS ELEKTRON GMBH,BREMEN,GERMANY. RP MAX, MD (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 18 TC 7 Z9 8 U1 0 U2 1 PU KLUWER ACADEMIC PUBL PI DORDRECHT PA SPUIBOULEVARD 50, PO BOX 17, 3300 AA DORDRECHT, NETHERLANDS SN 0025-3235 J9 MAR GEOPHYS RES JI Mar. Geophys. Res. PD FEB PY 1992 VL 14 IS 1 BP 77 EP 85 DI 10.1007/BF01674067 PG 9 WC Geochemistry & Geophysics; Oceanography SC Geochemistry & Geophysics; Oceanography GA HN713 UT WOS:A1992HN71300005 ER PT J AU GLICKSMAN, ME SMITH, RN MARSH, SP KUKLINSKI, R AF GLICKSMAN, ME SMITH, RN MARSH, SP KUKLINSKI, R TI MUSHY ZONE MODELING WITH MICROSTRUCTURAL COARSENING KINETICS SO METALLURGICAL TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE LA English DT Article AB A key element of mushy zone modeling is the description of the microscopic evolution of the lengthscales within the mushy zone and the influence of macroscopic transport processes. This article describes some recent progress in developing a mean-field statistical theory of phase coarsening in adiabatic mushy zones. The main theoretical results are (1) temporal scaling laws that indicate that the average lengthscale increases as time 1/3, (2) a self-similar distribution of mushy zone lengthscales based on spherical solid particle shapes, and (3) kinetic rate constants which provide the dependences of the coarsening process on material parameters and the volume fraction of the solid phase. High precision thermal decay experiments are described which verify aspects of the theory in pure material mushy zones held under adiabatic conditions. The microscopic coarsening theory is then integrated within a simple macroscopic heat-transfer model of one-dimensional alloy solidification. The method demonstrates an ability to predict the influence of macroscopic heat transfer on the evolution of primary and secondary dendrite arm spacings in Al-Cu alloys. C1 RENSSELAER POLYTECH INST,MECH ENGN,TROY,NY 12180. USN,RES LAB,PHYS MET BRANCH,WASHINGTON,DC 20375. USN,CTR UNDERWATER SYST,NEWPORT,RI 02841. RP GLICKSMAN, ME (reprint author), RENSSELAER POLYTECH INST,MAT & CHEM ENGN,TROY,NY 12180, USA. OI Glicksman, Martin/0000-0002-2675-2759 NR 16 TC 21 Z9 21 U1 0 U2 6 PU MINERALS METALS MATERIALS SOC PI WARRENDALE PA 420 COMMONWEALTH DR, WARRENDALE, PA 15086 SN 0360-2133 J9 METALL TRANS A PD FEB PY 1992 VL 23 IS 2 BP 659 EP 667 DI 10.1007/BF02801183 PG 9 WC Materials Science, Multidisciplinary SC Materials Science GA HD764 UT WOS:A1992HD76400027 ER PT J AU THORNTON, SA WIGNALL, SF KILPATRICK, ME BOURGEOIS, AL GARDINER, C BATCHELOR, RA BURR, DH OPRANDY, JJ GARST, P HYAMS, KC AF THORNTON, SA WIGNALL, SF KILPATRICK, ME BOURGEOIS, AL GARDINER, C BATCHELOR, RA BURR, DH OPRANDY, JJ GARST, P HYAMS, KC TI NORFLOXACIN COMPARED TO TRIMETHOPRIM SULFAMETHOXAZOLE FOR THE TREATMENT OF TRAVELERS DIARRHEA AMONG UNITED-STATES MILITARY PERSONNEL DEPLOYED TO SOUTH-AMERICA AND WEST AFRICA SO MILITARY MEDICINE LA English DT Article AB A randomized treatment trial of travelers' diarrhea was carried out among U.S. military personnel participating in routine exercises in several port cities in South America and West Africa. A 5-day, twice daily course of either norfloxacin (400 mg) or trimethoprim/sulfamethoxazole (TMP/SMX, 160/800 mg) was given to 142 volunteers. At the end of 5 days of treatment, diarrhea had resolved in 100% of 73 patients receiving norfloxacin and 97.1% (67/69) receiving TMP/SMX. A probable bacterial pathogen was determined in 44% of 142 subjects: 49% of the norfloxacin group and 39% of the TMP/SMX group. The most common pathogens detected were enterotoxigenic Escherichia coli in 20% of cases and rotavirus in 15%. Resistance to TMP/SMX was present in 20 (27%) bacterial isolates, while no resistance to norfloxacin was found. Eight of 10 patients in the TMP/SMX treatment group who had TMP/SMX-resistant bacterial enteropathogens improved clinically. Both norfloxacin and TMP/SMX were clinically effective in the treatment of travelers' diarrhea in this military population. RP THORNTON, SA (reprint author), USN,MED RES INST,DEPT INFECT DIS,ARLINGTON,VA 22217, USA. NR 0 TC 12 Z9 12 U1 0 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 1992 VL 157 IS 2 BP 55 EP 58 PG 4 WC Medicine, General & Internal SC General & Internal Medicine GA HC531 UT WOS:A1992HC53100006 PM 1603387 ER PT J AU DUCKWORTH, GW AF DUCKWORTH, GW TI GROSS HEMATURIA AS A PRESENTING SYMPTOM OF DISSEMINATED GONORRHEA SO MILITARY MEDICINE LA English DT Article AB I report a case of disseminated gonorrhea which presented with macrohematuria, a heretofore unreported occurrence. Because of associated symptoms, this patient was at first thought to be suffering from a nephrotic syndrome. RP DUCKWORTH, GW (reprint author), USN,AIR STN KEFLAVIK,BOX 8,FPO,NEW YORK,NY 09571, 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 FEB PY 1992 VL 157 IS 2 BP 100 EP 101 PG 2 WC Medicine, General & Internal SC General & Internal Medicine GA HC531 UT WOS:A1992HC53100017 PM 1603383 ER PT J AU HUBLER, GK AF HUBLER, GK TI PULSED LASER DEPOSITION SO MRS BULLETIN LA English DT Article RP HUBLER, GK (reprint author), USN,RES LAB,SURFACE MODIFICAT BRANCH,SURFACE PHYS SECT,WASHINGTON,DC 20375, USA. NR 4 TC 46 Z9 46 U1 0 U2 2 PU MATERIALS RESEARCH SOCIETY PI PITTSBURGH PA 9800 MC KNIGHT ROAD SUITE 327, PITTSBURGH, PA 15237 SN 0883-7694 J9 MRS BULL JI MRS Bull. PD FEB PY 1992 VL 17 IS 2 BP 26 EP 27 PG 2 WC Materials Science, Multidisciplinary; Physics, Applied SC Materials Science; Physics GA HE845 UT WOS:A1992HE84500004 ER PT J AU CHEUNG, J HORWITZ, J AF CHEUNG, J HORWITZ, J TI PULSED LASER DEPOSITION HISTORY AND LASER-TARGET INTERACTIONS SO MRS BULLETIN LA English DT Article ID MOLECULAR-BEAM EPITAXY; TC SUPERCONDUCTING FILMS; HGTE-CDTE SUPERLATTICES; THIN-FILMS; ABLATION DEPOSITION; INDUCED PLASMAS; BULK MATERIAL; EVAPORATION; SPECTROSCOPY; YBA2CU3O7-X C1 USN,RES LAB,DIV CONDENSED MATTER & RADIAT SCI,SURFACE MODIFICAT BRANCH,WASHINGTON,DC 20375. RP CHEUNG, J (reprint author), ROCKWELL INT SCI CTR,TECH STAFF,THOUSAND OAKS,CA 91360, USA. NR 66 TC 40 Z9 41 U1 0 U2 2 PU MATERIALS RESEARCH SOCIETY PI PITTSBURGH PA 9800 MC KNIGHT ROAD SUITE 327, PITTSBURGH, PA 15237 SN 0883-7694 J9 MRS BULL JI MRS Bull. PD FEB PY 1992 VL 17 IS 2 BP 30 EP 36 PG 7 WC Materials Science, Multidisciplinary; Physics, Applied SC Materials Science; Physics GA HE845 UT WOS:A1992HE84500005 ER PT J AU CHRISEY, DB INAM, A AF CHRISEY, DB INAM, A TI PULSED LASER DEPOSITION OF HIGH-TC SUPERCONDUCTING THIN-FILMS FOR ELECTRONIC DEVICE APPLICATIONS SO MRS BULLETIN LA English DT Article ID BA-CU-O; EVAPORATION; HETEROSTRUCTURES; SUPERLATTICES; SYSTEM C1 BELL COMMUN RES INC,THIN FILM & INTERFACE SCI RES GRP,RED BANK,NJ. RP CHRISEY, DB (reprint author), USN,RES LAB,SURFACE MODIFICAT BRANCH,WASHINGTON,DC 20375, USA. NR 46 TC 45 Z9 45 U1 2 U2 5 PU MATERIALS RESEARCH SOCIETY PI PITTSBURGH PA 9800 MC KNIGHT ROAD SUITE 327, PITTSBURGH, PA 15237 SN 0883-7694 J9 MRS BULL JI MRS Bull. PD FEB PY 1992 VL 17 IS 2 BP 37 EP 43 PG 7 WC Materials Science, Multidisciplinary; Physics, Applied SC Materials Science; Physics GA HE845 UT WOS:A1992HE84500006 ER PT J AU COTELL, CM GRABOWSKI, KS AF COTELL, CM GRABOWSKI, KS TI NOVEL MATERIALS APPLICATIONS OF PULSED LASER DEPOSITION SO MRS BULLETIN LA English DT Article ID THIN-FILMS; FERROELECTRIC MEMORIES; EPITAXIAL-GROWTH; ZINC-FERRITE; DIAMOND; ABLATION; EVAPORATION RP COTELL, CM (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 77 TC 41 Z9 41 U1 0 U2 3 PU MATERIALS RESEARCH SOCIETY PI PITTSBURGH PA 9800 MC KNIGHT ROAD SUITE 327, PITTSBURGH, PA 15237 SN 0883-7694 J9 MRS BULL JI MRS Bull. PD FEB PY 1992 VL 17 IS 2 BP 44 EP 53 PG 10 WC Materials Science, Multidisciplinary; Physics, Applied SC Materials Science; Physics GA HE845 UT WOS:A1992HE84500007 ER PT J AU DUNN, WL YACOUT, AM OFOGHLUDHA, F RIEL, G AF DUNN, WL YACOUT, AM OFOGHLUDHA, F RIEL, G TI GAMMA-RAY AND NEUTRON DOSE-EQUIVALENT BUILDUP FACTORS FOR INFINITE SLABS SO NUCLEAR SCIENCE AND ENGINEERING LA English DT Article ID SEARCHLIGHT PROBLEM; RADIATIVE-TRANSFER; WATER; IRON AB Gamma-ray and neutron dose-equivalent buildup factors are calculated for six common shielding materials in a point-source, infinite-slab, point-detector geometry using a decomposition of the solution to the transport problem into single- and multiple-scatter components. A rigorous solution for the single-scatter component is constructed and a Monte Carlo model for the multiple-scatter component is employed. Simplified models are fit to the calculated buildup factors as functions of slab thickness and source-detector separation, and model constants are evaluated for each of several source energies. Single-scatter and total slab buildup factors are presented, both in tabular form and in graphs that also show the fitted models, for six materials. The models are demonstrated for a sample problem. C1 USN,CTR SURFACE WARFARE,WHITE OAK LAB,SILVER SPRING,MD 20903. RP DUNN, WL (reprint author), QUANTUM RES SERV INC,POB 52391,DURHAM,NC 27717, USA. NR 18 TC 2 Z9 2 U1 0 U2 0 PU AMER NUCLEAR SOCIETY PI LA GRANGE PK PA 555 N KENSINGTON AVENUE, LA GRANGE PK, IL 60525 SN 0029-5639 J9 NUCL SCI ENG JI Nucl. Sci. Eng. PD FEB PY 1992 VL 110 IS 2 BP 134 EP 156 PG 23 WC Nuclear Science & Technology SC Nuclear Science & Technology GA HC111 UT WOS:A1992HC11100003 ER PT J AU CHOPLIN, NT MONROE, JF AF CHOPLIN, NT MONROE, JF TI SURGICALLY-INDUCED ASTIGMATISM IN COMBINED ECCE WITH FILTERING PROCEDURES COMPARED TO ECCE ALONE SO OPHTHALMIC SURGERY AND LASERS LA English DT Article ID EXTRACAPSULAR CATARACT-EXTRACTION; INTRAOCULAR-LENS IMPLANTATION; TRABECULECTOMY; GLAUCOMA AB Extracapsular cataract extraction with implantation of a posterior chamber lens combined with filtering surgery (glaucoma triple procedure) is frequently employed in the comanagement of cataract and glaucoma. Nineteen triple procedures with a minimum of six months follow up were compared to 19 cases of extracapsular cataract extraction with lens implant matched for age, sex, and surgeon with regard to surgically induced astigmatism as determined by vector analysis. Follow up averaged 10 months for the triple group and 14 months for the controls. There was no statistically significant difference in preoperative astigmatism between the two groups nor in the mean number of sutures cut. Postoperatively, the keratometric cylinder averaged 2.55 +/- 1.54 diopters for the cases and 1.20 +/- 1.11 D for the controls; the difference of 1.36 D was statistically significant (P = .004). The postoperative refractive cylinder was 2.34 +/- 1.54 D for the cases and 1.29 +/- 1.07 D for the controls; the difference of 1.05 D was statistically significant (P = .017). With regard to surgically-induced astigmatism, vector analysis showed that the cases averaged 2.18 +/- 1.25 D and the controls 1.23 +/- 0.81 D; the difference of 0.95 D was statistically significant (P = .006). With regard to surgically-induced astigmatism, vector analysis showed that the cases averaged 2.18 +/- 1.25 D and the controls 1.23 +/- 0.81 D; the difference of 0.95 D was statistically significant (P = .006). When analyzed for change along the vertical meridian, the cases averaged 1.12 +/- 1.57 D surgically-induced against-the-rule astigmatism, as compared with 0.30 +/- 1.16 D for the controls (difference, 0.83 D; P = .062). The glaucoma triple procedures induced approximately 1.00 D more cylinder than the controls. C1 USN HOSP,DEPT OPHTHALMOL & CLIN INVEST,SAN DIEGO,CA 92134. USN HOSP,DEPT OPTHALMOL,JACKSONVILLE,FL. NR 10 TC 6 Z9 6 U1 0 U2 0 PU SLACK INC PI THOROFARE PA 6900 GROVE RD, THOROFARE, NJ 08086 SN 0022-023X J9 OPHTHALMIC SURG LAS JI Ophthalmic Surg. Lasers PD FEB PY 1992 VL 23 IS 2 BP 81 EP 84 PG 4 WC Ophthalmology; Surgery SC Ophthalmology; Surgery GA HF392 UT WOS:A1992HF39200002 PM 1549299 ER PT J AU ULRICH, GG WAECKER, NJ MESITER, SJ PETERSON, TJ HOOPER, DG AF ULRICH, GG WAECKER, NJ MESITER, SJ PETERSON, TJ HOOPER, DG TI CAT SCRATCH DISEASE ASSOCIATED WITH NEURORETINITIS IN A 6-YEAR-OLD GIRL SO OPHTHALMOLOGY LA English DT Article ID BACTERIAL-INFECTION; THERAPY AB Cat scratch disease is a subacute regional lymphadenitis usually preceded by a history of being scratched by a cat or young kitten. The spectrum of illness ranges from mild self-limited adenopathy to severe systemic disease, including hepatosplenomegaly, encephalopathy, osteolytic lesions, splenic abscesses, mediastinal masses, and neuroretinitis. Vision loss is a rare complication of the disease. The authors report a patient with cat scratch disease associated with acute febrile illness, lymphocytic meningitis, and acute vision loss secondary to neuroretinitis. To their knowledge, this is the first ophthalmic case reported in which the diagnosis is supported by both a positive skin test and positive histopathology. C1 USN HOSP,DEPT OPHTHALMOL,SAN DIEGO,CA 92134. USN HOSP,DEPT PEDIAT,SAN DIEGO,CA 92134. USN HOSP,DEPT LAB,SAN DIEGO,CA 92134. RP ULRICH, GG (reprint author), USN HOSP,DEPT CLIN INVEST,SAN DIEGO,CA 92134, USA. NR 14 TC 36 Z9 36 U1 0 U2 0 PU LIPPINCOTT-RAVEN PUBL PI PHILADELPHIA PA 227 EAST WASHINGTON SQ, PHILADELPHIA, PA 19106 SN 0161-6420 J9 OPHTHALMOLOGY JI Ophthalmology PD FEB PY 1992 VL 99 IS 2 BP 246 EP 249 PG 4 WC Ophthalmology SC Ophthalmology GA HC225 UT WOS:A1992HC22500021 PM 1553216 ER PT J AU ZHANG, Y LI, Y KANTERAKIS, EG KATZ, A LU, XJ TOLIMIERI, R CAVIRIS, NP AF ZHANG, Y LI, Y KANTERAKIS, EG KATZ, A LU, XJ TOLIMIERI, R CAVIRIS, NP TI OPTICAL REALIZATION OF WAVELET TRANSFORM FOR A ONE-DIMENSIONAL SIGNAL SO OPTICS LETTERS LA English DT Article ID DECOMPOSITION AB A novel scheme for optical realization of wavelet transform for a one-dimensional signal is described. Using commercially available components, the proposed system can perform wavelet transform in real time. Some preliminary experimental results are demonstrated. C1 SCS TELECOM,PORT WASHINGTON,NY 11050. CUNY,CTR LARGE SCALE COMPUTAT,NEW YORK,NY 10036. USN,CTR SURFACE WARFARE,SILVER SPRING,MD 20903. RP ZHANG, Y (reprint author), CUNY,DEPT ELECT ENGN,NEW YORK,NY 10031, USA. NR 8 TC 38 Z9 38 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 1992 VL 17 IS 3 BP 210 EP 212 DI 10.1364/OL.17.000210 PG 3 WC Optics SC Optics GA HB715 UT WOS:A1992HB71500017 PM 19784278 ER PT J AU GEDRIDGE, RW AF GEDRIDGE, RW TI CONVENIENT ONE-POT SYNTHESIS OF TERT-BUTYLDIMETHYLANTIMONY SO ORGANOMETALLICS LA English DT Note ID CHEMICAL VAPOR-DEPOSITION; N-JUNCTION FORMATION; EPITAXIAL-GROWTH; INAS1-XSBX; INSB; ALLOYS; MOCVD AB tert-Butyldimethylantimony, (t-Bu)Me2Sb, was prepared by a one-pot reaction of SbCl3 with 1 equiv of (t-Bu)MgCl at -50-degrees-C followed by 2 equiv of MeMgBr at 0-degrees-C in diethyl ether. (t-Bu)Me2Sb was isolated in 64 % yield (based on SbCl3) after fractional vacuum distillation (63-degrees-C at 30 Torr) and can be used as a precursor in the chemical vapor deposition of antimony-containing semiconductor materials. RP GEDRIDGE, RW (reprint author), USN,CTR WEAP,DEPT RES,DIV CHEM,CHINA LAKE,CA 93555, USA. NR 25 TC 9 Z9 9 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0276-7333 J9 ORGANOMETALLICS JI Organometallics PD FEB PY 1992 VL 11 IS 2 BP 967 EP 969 DI 10.1021/om00038a072 PG 3 WC Chemistry, Inorganic & Nuclear; Chemistry, Organic SC Chemistry GA HE298 UT WOS:A1992HE29800072 ER PT J AU HOFFMAN, ME AF HOFFMAN, ME TI MULTIPLE HARMONIC SERIES SO PACIFIC JOURNAL OF MATHEMATICS LA English DT Article AB We consider several identities involving the multiple harmonic series [GRAPHICS] which converge when the exponents i(j) are at least 1 and i1 > 1. There is a simple relation of these series with products of Riemann zeta functions (the case k = 1) when all the i(j) exceed 1. There are also two plausible identities concerning these series for integer exponents, which we call the sum and duality conjectures. Both generalize identities first proved by Euler. We give a partial proof of the duality conjecture, which coincides with the sum conjecture in one family of cases. We also prove all cases of the sum and duality conjectures when the sum of the exponents is at most 6. RP HOFFMAN, ME (reprint author), USN ACAD,ANNAPOLIS,MD 21402, USA. RI Hoffman, Michael/D-9913-2011 OI Hoffman, Michael/0000-0002-9436-7596 NR 8 TC 136 Z9 141 U1 0 U2 0 PU PACIFIC JOURNAL MATHEMATICS PI BERKELEY PA PO BOX 4163, BERKELEY, CA 94704-0163 SN 0030-8730 J9 PAC J MATH JI Pac. J. Math. PD FEB PY 1992 VL 152 IS 2 BP 275 EP 290 PG 16 WC Mathematics SC Mathematics GA GZ831 UT WOS:A1992GZ83100004 ER PT J AU DUESBERY, MS LOUAT, NP SADANANDA, K AF DUESBERY, MS LOUAT, NP SADANANDA, K TI THE NUMERICAL-SIMULATION OF CONTINUUM DISLOCATIONS SO PHILOSOPHICAL MAGAZINE A-PHYSICS OF CONDENSED MATTER STRUCTURE DEFECTS AND MECHANICAL PROPERTIES LA English DT Article AB A new and improved method for the treatment of dislocations in continuum numerical models, in the mesoscale range of lengths 1-1000 nm, is introduced. The dislocation representation, based on splined parametric polynomials, is described. The necessary numerical procedures are presented and justified in detail. Application of the method is illustrated by three examples. Firstly, the passage of perfect dislocations through a composite containing passive voids is studied; it is shown that in this case the resistance to dislocation motion can approach closely to the ideal of impenetrable obstacles. Secondly, the interaction of dissociated superdislocations with impenetrable obstacles is considered, for superpartial separations as small as two Burgers vectors; a smooth transition between known analytic limits is shown, demonstrating the utility of the method. Thirdly, the behaviour of Heidenreich-Shockley dissociated dislocations of varying character at coherent dispersoids is investigated; it is suggested that the probability of bypass by cross-slip is highest for dislocations of near-60-degrees character. RP DUESBERY, MS (reprint author), USN,RES LAB,WASHINGTON,DC 20350, USA. NR 26 TC 16 Z9 16 U1 0 U2 2 PU TAYLOR & FRANCIS LTD PI LONDON PA ONE GUNDPOWDER SQUARE, LONDON, ENGLAND EC4A 3DE SN 0141-8610 J9 PHILOS MAG A JI Philos. Mag. A-Phys. Condens. Matter Struct. Defect Mech. Prop. PD FEB PY 1992 VL 65 IS 2 BP 311 EP 325 PG 15 WC Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering; Physics, Applied; Physics, Condensed Matter SC Materials Science; Metallurgy & Metallurgical Engineering; Physics GA HE451 UT WOS:A1992HE45100004 ER PT J AU KRESIN, VZ WOLF, SA DEUTSCHER, G AF KRESIN, VZ WOLF, SA DEUTSCHER, G TI THE EFFECT OF PHONON-MEDIATED CHARGE-TRANSFER AND INTERNAL PROXIMITY EFFECT ON THE PROPERTIES OF MULTIGAP CUPRATE SUPERCONDUCTORS SO PHYSICA C LA English DT Article ID ENERGY-GAP; TRANSITION-TEMPERATURE; OXIDE SUPERCONDUCTORS; STATE; TC; YBA2CU3O7; CONDUCTIVITY; RESISTIVITY; PARAMETERS; CRYSTAL AB The theoretical model capable of calculating the superconducting properties (e.g. T(c), energy gaps, etc) of materials such as Y1Ba2Cu3O7 which consist of two conducting subsystems (planes and chains) is developed. The system is characterized by two energies gaps. The interplay of two channels (phonon-mediated processes and the intrinsic proximity effect) inducing the superconducting state in the chains is studied. The proximity effect combined with the phonon-mediated channel appears to be favorable for superconductivity. The theory describes the effect of the oxygen ordering on T(c) and the induced gap and allows us to explain a number of experiments including the plateau in T(c) versus oxygen, the large residual microwave losses, zero-bias anomalies and the temperature dependence of the penetration depth. C1 USN,RES LAB,WASHINGTON,DC 20375. TEL AVIV UNIV,DEPT PHYS & ASTRON,IL-69978 TEL AVIV,ISRAEL. RP KRESIN, VZ (reprint author), UNIV CALIF BERKELEY,LAWRENCE BERKELEY LAB,BERKELEY,CA 94720, USA. RI Wolf, Stuart/A-7513-2009 NR 33 TC 24 Z9 24 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0921-4534 J9 PHYSICA C JI Physica C PD FEB 1 PY 1992 VL 191 IS 1-2 BP 9 EP 14 DI 10.1016/0921-4534(92)90624-L PG 6 WC Physics, Applied SC Physics GA HH408 UT WOS:A1992HH40800002 ER PT J AU BECHTOLD, J XUE, YY HUANG, ZJ HUNGERFORD, EV HOR, PH CHU, CW MARUYAMA, XK BACKE, H BUSKIRK, FR CONNORS, SM SNYDER, DD JEAN, YC FARMER, JW AF BECHTOLD, J XUE, YY HUANG, ZJ HUNGERFORD, EV HOR, PH CHU, CW MARUYAMA, XK BACKE, H BUSKIRK, FR CONNORS, SM SNYDER, DD JEAN, YC FARMER, JW TI DEFECT SIZE DEPENDENCE OF CRITICAL CURRENT-DENSITY ENHANCEMENT FOR IRRADIATED YBA2CU3O7-DELTA SO PHYSICA C LA English DT Article ID ELECTRON-IRRADIATION; SUPERCONDUCTORS; BA2YCU3O7-DELTA AB The effects of 100 MeV electron (to 3.6 x 10(18) cm-2) and fast neutron irradiation (to 4.0 x 10(18) cm-2) on the superconducting properties of melt-textured YBa2Cu3O7-delta is studied experimentally. By comparing the critical current enhancement effects normalized to the total atomic displacement damage, it is found that the enhancement depends heavily on the type and energy of radiation and on the beam direction with respect to the crystal. Fast neutron irradiation is more effective than 100 MeV electron irradiation (along the c-axis) in enhancing the critical current, and electron irradiation along the c-axis is more effective than electron irradiation along the a, b-plane. A model based on defect size is proposed to interpret the effects. C1 UNIV HOUSTON,TEXAS CTR SUPERCONDUCT,HOUSTON,TX 77204. USN,POSTGRAD SCH,DEPT PHYS,MONTEREY,CA 93943. UNIV MISSOURI,DEPT CHEM,KANSAS CITY,MO 64110. UNIV MISSOURI,COLUMBIA,MO 65211. UNIV MAINZ,INST PHYS,W-6500 MAINZ 1,GERMANY. NR 28 TC 4 Z9 4 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0921-4534 J9 PHYSICA C JI Physica C PD FEB 1 PY 1992 VL 191 IS 1-2 BP 199 EP 204 DI 10.1016/0921-4534(92)90648-V PG 6 WC Physics, Applied SC Physics GA HH408 UT WOS:A1992HH40800026 ER PT J AU ZIGLER, A JACOBS, VL NEWMAN, DA BURKHALTER, PG NAGEL, DJ LUK, TS MCPHERSON, A BOYER, K RHODES, CK AF ZIGLER, A JACOBS, VL NEWMAN, DA BURKHALTER, PG NAGEL, DJ LUK, TS MCPHERSON, A BOYER, K RHODES, CK TI OBSERVATION OF DENSITY-ENHANCED DIELECTRONIC SATELLITE SPECTRA PRODUCED DURING SUBPICOSECOND LASER-MATTER INTERACTIONS SO PHYSICAL REVIEW A LA English DT Article AB An experimental verification of the theoretically predicted density enhancement of the dielectronic satellite spectra emitted by multiply charged lithiumlike ions in high-density plasmas is reported. These plasmas were created by the interaction of solid MgF2 and SiO2 targets with high-intensity, subpicosecond, ultraviolet laser radiation. Comparisons between the observed and theoretically predicted values for the intensity ratios between two different pairs of dielectronic satellite lines have enabled determinations of electron densities of the order of 10(23) cm-3 to be made in these high-density laser-produced plasmas. C1 USN,RES LAB,DIV CONDENSED MATTER & RADIAT SCI,WASHINGTON,DC 20375. UNIV ILLINOIS,DEPT PHYS,CHICAGO,IL 60680. SFA INC,LANDOVER,MD 20785. NR 13 TC 22 Z9 23 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1050-2947 J9 PHYS REV A JI Phys. Rev. A PD FEB 1 PY 1992 VL 45 IS 3 BP 1569 EP 1574 DI 10.1103/PhysRevA.45.1569 PG 6 WC Optics; Physics, Atomic, Molecular & Chemical SC Optics; Physics GA HC995 UT WOS:A1992HC99500039 ER PT J AU SINGH, DJ AF SINGH, DJ TI MAGNETISM IN BCC COBALT SO PHYSICAL REVIEW B LA English DT Article ID FINITE-TEMPERATURE FERROMAGNETISM; ELECTRONIC-STRUCTURE; BRILLOUIN-ZONE; QUASIPARTICLE BANDSTRUCTURE; METASTABLE BCC; SPECIAL POINTS; BAND THEORY; FILMS; CO; GAAS AB Local-spin-density-approximation-based calculations, performed using a general-potential linearized augmented-plane-wave method, are presented for bcc Co. The ground-state properties and magnetization energies are reported. It is found that the moment is strongly suppressed in constrained antiferromagnetic calculations, indicating that a local-moment picture is less appropriate for this material than for bee iron. RP USN, RES LAB, COMPLEX SYST THEORY BRANCH, WASHINGTON, DC 20375 USA. RI Singh, David/I-2416-2012 NR 45 TC 37 Z9 37 U1 1 U2 11 PU AMER PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 2469-9950 EI 2469-9969 J9 PHYS REV B JI Phys. Rev. B PD FEB 1 PY 1992 VL 45 IS 5 BP 2258 EP 2261 DI 10.1103/PhysRevB.45.2258 PG 4 WC Physics, Condensed Matter SC Physics GA HC835 UT WOS:A1992HC83500038 ER PT J AU WEBB, AW SKELTON, EF QADRI, SB BROWNING, V CARPENTER, ER AF WEBB, AW SKELTON, EF QADRI, SB BROWNING, V CARPENTER, ER TI ABSENCE OF SUPERCONDUCTIVITY IN 225 COMPOSITIONS OF 19 PARTIALLY-METAL-SUBSTITUTED LACUO3 SYSTEMS SO PHYSICAL REVIEW B LA English DT Article ID DEFICIENT PEROVSKITE PHASE; CU-O SYSTEM; LA2CUO4; COPPER; OXIDES AB The compound LaCuO3, and the substituted series La1-xMxCuO3, where M = Mg, Ca, Sr, Ba, Pb, Sc, Y, Pr, Nd, Sb, Bi, Ti, Zr, or Ce and LaCu1-xMx'O3, where M' = Cr, Fe, Ni, Zn, or Ag, have been prepared by high-pressure, high-temperature synthesis. The electrical resistivity was checked qualitatively, and the magnetic susceptibility measured to minimum temperatures of 2-50 K. No evidence of the Meissner effect was found in any of the compositions studied, indicative of the absence of superconductivity in at least 99% of the sample volume. RP WEBB, AW (reprint author), USN,RES LAB,DIV CONDENSED MATTER & RADIAT SCI,WASHINGTON,DC 20375, USA. NR 25 TC 13 Z9 13 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD FEB 1 PY 1992 VL 45 IS 5 BP 2480 EP 2483 DI 10.1103/PhysRevB.45.2480 PG 4 WC Physics, Condensed Matter SC Physics GA HC835 UT WOS:A1992HC83500066 ER PT J AU REEVES, ME WEAVER, BD KRIEGER, DA CHRISEY, DB HORWITZ, JS WOLF, SA SUMMERS, GP AF REEVES, ME WEAVER, BD KRIEGER, DA CHRISEY, DB HORWITZ, JS WOLF, SA SUMMERS, GP TI MAGNETIC-FIELD DEPENDENCE OF CRITICAL CURRENTS IN PROTON-IRRADIATED YBA2CU3O7-DELTA FILMS - CONVENTIONAL BEHAVIOR OF THE PINNING-FORCE DENSITY SO PHYSICAL REVIEW B LA English DT Note ID II SUPERCONDUCTORS; THIN-FILMS; FLUX CREEP; LINE; IRREVERSIBILITY; ENHANCEMENT; CRYSTALS; PINS AB We have measured the magnetic-field dependence (with the field applied perpendicular to the a-b plane) at 77 K of the critical current density (J(c)) of a proton-irradiated YBa2Cu3O7-delta thin film. When fluences of 2-MeV protons were varied from 0 to 2 x 10(16) protons/cm2, the transition temperature (T(c)) and the field at which J(c) vanishes were diminished slightly compared with the suppression of J(c). The curves of pinning-force density versus field can be scaled to follow a common functional dependence, which indicates that the distribution of pinning energies in the film is not altered by increasing proton irradiation. The pinning-force data indicate that the critical current is limited by thermally activated flux creep between sites on the flux lattice, and the reduction in J(c)(H) is explained by the suppression of T(c) with increasing proton damage. RP REEVES, ME (reprint author), USN, RES LAB, WASHINGTON, DC 20375 USA. RI Wolf, Stuart/A-7513-2009 NR 29 TC 16 Z9 16 U1 0 U2 2 PU AMER PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1098-0121 EI 1550-235X J9 PHYS REV B JI Phys. Rev. B PD FEB 1 PY 1992 VL 45 IS 5 BP 2585 EP 2588 DI 10.1103/PhysRevB.45.2585 PG 4 WC Physics, Condensed Matter SC Physics GA HC835 UT WOS:A1992HC83500096 ER PT J AU JIANG, H WIDOM, A HUANG, Y YUAN, T VITTORIA, C CHRISEY, DB HORWITZ, JS AF JIANG, H WIDOM, A HUANG, Y YUAN, T VITTORIA, C CHRISEY, DB HORWITZ, JS TI QUANTUM NUCLEATION AND THERMAL-ACTIVATION OF VORTEX RINGS IN HIGH-TC SUPERCONDUCTORS SO PHYSICAL REVIEW B LA English DT Article ID GLASS SUPERCONDUCTIVITY AB Vortex-ring nucleation by thermal activation and quantum-tunneling processes in high-T(c) superconductors is discussed. The nonlinear resistance scales as e-(J(v)/J)v. Thermal activation yields a critical index of v = 1, while quantum tunneling (without normal current dissipation) yields a critical index of v = 2. Current-voltage characteristics were measured on both disordered (low-J(c)), ordered (c axis normal to the film plane, high-J(c)) Y-Ba-Cu-O films, and microbridges below T(c). The data were examined in terms of both thermal-activation and quantum-nucleation models. For the disordered films, the v = 1 scaling law is in resonable agreement with data, while v = 2 scaling is required to explain the results of the ordered films at low temperatures. For the microbridges, the v = 2 scaling extends even to high temperatures. C1 NORTHEASTERN UNIV,DEPT ELECT ENGN,BOSTON,MA 02115. USN,RES LAB,WASHINGTON,DC 20375. RP JIANG, H (reprint author), NORTHEASTERN UNIV,DEPT PHYS,BOSTON,MA 02115, USA. NR 14 TC 11 Z9 11 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 1 PY 1992 VL 45 IS 6 BP 3048 EP 3053 DI 10.1103/PhysRevB.45.3048 PG 6 WC Physics, Condensed Matter SC Physics GA HD258 UT WOS:A1992HD25800051 ER PT J AU LINENGER, JM CHRISTENSEN, CP AF LINENGER, JM CHRISTENSEN, CP TI IS ILIOTIBIAL BAND SYNDROME OFTEN OVERLOOKED SO PHYSICIAN AND SPORTSMEDICINE LA English DT Article AB Iliotibial band syndrome (ITBS) is caused by training errors but may be influenced by anatomic and dynamic factors. The diagnosis involves matching a complete and accurate history with characteristic pain over and around the lateral femoral epicondyle. The authors studied US Marine recruits in basic training and found an incidence that suggests ITBS may be underdiagnosed. Treatment usually involves simple measures such as rest and stretching exercises, but surgical resection is sometimes necessary. RP LINENGER, JM (reprint author), USN,HLTH RES CTR,SAN DIEGO,CA 92186, USA. NR 0 TC 6 Z9 7 U1 0 U2 1 PU MCGRAW HILL HEALTHCARE PUBLICATIONS PI MINNEAPOLIS PA 4530 WEST 77TH ST, MINNEAPOLIS, MN 55435-5000 SN 0091-3847 J9 PHYSICIAN SPORTSMED JI Physician Sportsmed. PD FEB PY 1992 VL 20 IS 2 BP 98 EP & PG 0 WC Primary Health Care; Orthopedics; Sport Sciences SC General & Internal Medicine; Orthopedics; Sport Sciences GA HC990 UT WOS:A1992HC99000011 ER PT J AU SHURTLEFF, D RASLEAR, TG GENOVESE, RF SIMMONS, L AF SHURTLEFF, D RASLEAR, TG GENOVESE, RF SIMMONS, L TI PERCEPTUAL BISECTION IN RATS - THE EFFECTS OF PHYSOSTIGMINE, SCOPOLAMINE AND PIRENZEPINE SO PHYSIOLOGY & BEHAVIOR LA English DT Article DE PHYSOSTIGMINE; PIRENZEPINE; SCOPOLAMINE; CHOLINERGIC; TEMPORAL DISCRIMINATION; LOUDNESS DISCRIMINATION; RATS ID DIISOPROPYL PHOSPHOROFLUORIDATE DFP; TIME PERCEPTION; INTERNAL CLOCK; DISCRIMINATION; PATTERNS; MODELS; BIAS; LAW AB The effects of cholinergic drugs on three different perceptual bisection tasks were studied in rats. Physostigmine (0.056-0.56 mg/kg), a reversible anticholinesterase, produced dose-dependent decrements in discriminability (A'), but did not affect the bisection point (BP) in visual duration, auditory duration, and auditory intensity bisection tasks. This finding is consistent with results previously obtained in an auditory duration bisection task with an irreversible anticholinesterase, diisopropyl phosphorfluoridate. Scopolamine (0.075-0.422 mg/kg), a muscarinic cholinergic-receptor antagonist, produced dose-dependent decrements in both A' and BP in visual and auditory duration bisection tasks. The behavioral antagonism between physostigmine (0.56 mg/kg) and scopolamine (0.075-0.237 mg/kg) was studied in the visual and auditory duration bisection tasks. The BP was not affected by physostigmine alone or in combination with scopolamine, except at the largest dose of scopolamine, which produced a reliable decrement in the BP. A', however, was equally decreased by physostigmine alone and all combinations of physostigmine and scopolamine. Pirenzepine (1, 3 and 10 mg/kg), a selective high-affinity M1 muscarinic antagonist, had no effect on A' or the BP in the duration bisection tasks, suggesting changes in perception produced by muscarinic antagonists do not involve the M1 receptor subtype. The similar drug effects in different sensory modalities (visual and auditory) and perceptual systems (subjective duration and loudness) suggest that cholinergic drugs may affect perceptual mechanisms responsible for sensory coding, such as the output of a neural generator. C1 WALTER REED ARMY MED CTR,DEPT MICROWAVE RES,WASHINGTON,DC 20307. WALTER REED ARMY MED CTR,DEPT MED NEUROSCI,WASHINGTON,DC 20307. RP SHURTLEFF, D (reprint author), USN,MED RES INST,THERMAL STRESS ADAPTAT PROGRAM,MS-11,BETHESDA,MD 20889, USA. NR 33 TC 20 Z9 20 U1 0 U2 1 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0031-9384 J9 PHYSIOL BEHAV JI Physiol. Behav. PD FEB PY 1992 VL 51 IS 2 BP 381 EP 390 DI 10.1016/0031-9384(92)90156-V PG 10 WC Psychology, Biological; Behavioral Sciences SC Psychology; Behavioral Sciences GA HA082 UT WOS:A1992HA08200024 PM 1557449 ER PT J AU ODENWALD, S SHIVANANDAN, K THRONSON, HA AF ODENWALD, S SHIVANANDAN, K THRONSON, HA TI ASTRONOMICAL OBSERVATIONS AT 10-MU-M AND 20-MU-M WITH THE NRL INFRARED CAMERA SO PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF THE PACIFIC LA English DT Article ID H II REGIONS; ARRAY CAMERA; MOLECULAR CLOUD; STAR FORMATION; NGC-7538; M82; NGC-2264; EMISSION; OBJECTS; FLOWS AB An infrared camera for astronomical research has been developed at the Naval Research Laboratory, Center for Advanced Space Sensing. A series of observations in 1990 December at the 2.3-m Wyoming Infrared Observatory (WIRO) yielded new astronomical images of the star forming regions M42/IRc 1, NGC 2264/IRS1 and NGC 7538/IRS1 at 12 and 20-mu-m, in addition to images of a variety of stellar calibrators. Based on a 10 x 50 element, Si:As BIBIB/SWIFET hybrid array fabricated at Rockwell International, this camera system (IRCAM) achieves its peak sensitivity between 18-22-mu-m, making it well matched for observing in the 20-mu-m atmospheric window. Substantial sensitivity is also available at 10-mu-m so that near-simultaneous observations are feasible through both windows. IRCAM employs four, (DELTA-lambda almost-equal-to 1.0-mu-m) filters at 8, 10, 12, and 12.4-mu-m; a broadband filter: 18-24-mu-m, as well as standard K, L, and M filters. The array field of view is 20" x 100" with 1."6 pixels surrounded by 0."4 dead space, allowing diffraction-limited observing at 20-mu-m with a 2.3-m telescope. In this paper, we describe the camera system, and present the results of the astronomical observations conducted at the Wyoming Infrared Observatory. C1 USN,RES LAB,CTR ADV SPACE SENSING,WASHINGTON,DC 20375. UNIV WYOMING,DEPT PHYS & ASTRON,LARAMIE,WY 82071. RP ODENWALD, S (reprint author), BDM INT INC,WASHINGTON,DC 20224, USA. RI Thronson, Harley/E-3382-2012 NR 54 TC 2 Z9 2 U1 0 U2 0 PU ASTRONOMICAL SOC PACIFIC PI SAN FRANCISCO PA 390 ASHTON AVE, SAN FRANCISCO, CA 94112 SN 0004-6280 J9 PUBL ASTRON SOC PAC JI Publ. Astron. Soc. Pac. PD FEB PY 1992 VL 104 IS 672 BP 127 EP 139 DI 10.1086/132968 PG 13 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA HF143 UT WOS:A1992HF14300007 ER PT J AU HARRIS, HC VRBA, FJ AF HARRIS, HC VRBA, FJ TI SEEING MEASUREMENTS AND OBSERVING STATISTICS AT THE UNITED-STATES-NAVAL-OBSERVATORY, FLAGSTAFF STATION SO PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF THE PACIFIC LA English DT Article AB Direct measurements of the seeing for the U.S. Naval Observatory, Flagstaff Station are presented for the years 1986-1991 from the USNO CCD parallax program at the 1.55-m telescope. Cloud-cover and seeing-related statistics are presented for all programs from the same telescope for the years 1969-1990. The data show that seeing at the zenith has a median of 1.3 arcsec and a mode of 1.0 arcsec FWHM; the distribution of observed seeing probably includes a significant contribution from local dome seeing and/or telescope effects. Cloud-cover statistics show that a yearly average of approximately 45% of the nighttime hours are clear and 65% usable. Both the cloud-cover and seeing statistics show significant seasonal variations. The Flagstaff data are also compared with published statistics from Kitt Peak National Observatory. RP HARRIS, HC (reprint author), USN OBSERV,FLAGSTAFF STN,POB 1149,FLAGSTAFF,AZ 86002, USA. NR 11 TC 9 Z9 9 U1 0 U2 0 PU ASTRONOMICAL SOC PACIFIC PI SAN FRANCISCO PA 390 ASHTON AVE, SAN FRANCISCO, CA 94112 SN 0004-6280 J9 PUBL ASTRON SOC PAC JI Publ. Astron. Soc. Pac. PD FEB PY 1992 VL 104 IS 672 BP 140 EP 145 DI 10.1086/132969 PG 6 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA HF143 UT WOS:A1992HF14300008 ER PT J AU MARRIAN, CRK DOBISZ, EA GLEMBOCKI, OJ AF MARRIAN, CRK DOBISZ, EA GLEMBOCKI, OJ TI NANOFABRICATION - HOW SMALL CAN DEVICES GET SO R&D MAGAZINE LA English DT Article RP MARRIAN, CRK (reprint author), USN,RES LAB,NANOELECTR PHYS SECT,WASHINGTON,DC 20375, USA. NR 0 TC 1 Z9 1 U1 0 U2 0 PU CAHNERS-DENVER PUBLISHING CO PI HIGHLANDS RANCH PA 8773 S RIDGELINE BLVD, HIGHLANDS RANCH, CO 80126-2329 SN 0746-9179 J9 R&D MAG JI R D Mag. PD FEB PY 1992 VL 34 IS 2 BP 123 EP & PG 0 WC Engineering, Industrial; Multidisciplinary Sciences SC Engineering; Science & Technology - Other Topics GA HD916 UT WOS:A1992HD91600016 ER PT J AU BASHKANSKY, M WEXLER, BL AF BASHKANSKY, M WEXLER, BL TI A SIMPLE TECHNIQUE TO PREVENT MISFIRE ARCING IN DISCHARGE-PUMPED EXCIMER LASERS SO REVIEW OF SCIENTIFIC INSTRUMENTS LA English DT Note AB A simple spark gap has been used to prevent arcing due to lack of preionization in a laboratory discharge-pumped excimer laser. Adjustment of the self-breakdown point of the gap can be made in place without allowing any damaging arcs. RP BASHKANSKY, M (reprint author), USN,RES LAB,DIV OPT SCI,LASER PHYS BRANCH,WASHINGTON,DC 20375, USA. NR 1 TC 0 Z9 0 U1 1 U2 1 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0034-6748 J9 REV SCI INSTRUM JI Rev. Sci. Instrum. PD FEB PY 1992 VL 63 IS 2 BP 1838 EP 1839 DI 10.1063/1.1143293 PG 2 WC Instruments & Instrumentation; Physics, Applied SC Instruments & Instrumentation; Physics GA HC465 UT WOS:A1992HC46500030 ER PT J AU JACOBSON, RS AF JACOBSON, RS TI IMPACT OF CRUSTAL EVOLUTION ON CHANGES OF THE SEISMIC PROPERTIES OF THE UPPERMOST OCEAN CRUST SO REVIEWS OF GEOPHYSICS LA English DT Review ID EAST PACIFIC RISE; COSTA-RICA RIFT; GALAPAGOS-SPREADING-CENTER; COMPRESSIONAL WAVE ATTENUATION; DRILLING PROJECT HOLE-504B; MID-ATLANTIC RIDGE; VELOCITY STRUCTURE; HEAT-FLOW; HYDROTHERMAL CIRCULATION; LATERAL HETEROGENEITY AB One of the most important observations of oceanic crustal evolution is that the uppermost part of the igneous crust, layer 2A, appears to thin and eventually disappear as its seismic velocity doubles from approximately 2.2 to 4.5 km s-1 in the first 40 m.y. The most likely cause is decreasing porosity in extruded basalts that compose the uppermost igneous crust by filling cracks with hydrothermally generated minerals, a by-product of off-axis hydrothermal circulation and alteration of basalts. New insights from two recent papers on crustal hydrothermal circulation patterns and modeling of the effects of crack geometry distributions upon seismic velocities provide guidance to relate filling of cracks within the basement to seismic velocity increases. A qualitative model of layer 2A crustal evolution is outlined that satisfies many geophysical and geochemical observations, some seemingly unrelated. Somewhat surprisingly, the crustal age at which layer 2A seismic velocities reach their maximum value is primarily controlled by the integrated permeability of the overlying sediment, which in turn, controls the hydrologic regime necessary for secondary mineral precipitation. Speculative predictions can be used to verify, refine, or invalidate this dynamic model of crustal evolution. Major scientific and technical obstacles must be overcome before a definitive model can be quantified. With such a rigorous model of crustal upper crustal evolution in hand, remote geophysical sensing tools can begin to fulfill the promise of interpreting the physical state, composition, and past history of oceanic crust. RP OFF NAVAL RES, ARLINGTON, VA 22217 USA. RI Wright, Dawn/A-4518-2011 OI Wright, Dawn/0000-0002-2997-7611 NR 83 TC 87 Z9 88 U1 3 U2 9 PU AMER GEOPHYSICAL UNION PI WASHINGTON PA 2000 FLORIDA AVE NW, WASHINGTON, DC 20009 USA SN 8755-1209 EI 1944-9208 J9 REV GEOPHYS JI Rev. Geophys. PD FEB PY 1992 VL 30 IS 1 BP 23 EP 42 DI 10.1029/91RG02811 PG 20 WC Geochemistry & Geophysics SC Geochemistry & Geophysics GA HK888 UT WOS:A1992HK88800002 ER PT J AU FONTANELLA, JJ WILSON, JJ SMITH, MK WINTERSGILL, MC COUGHLIN, CS MAZAUD, P GREENBAUM, SG SIDDON, RL AF FONTANELLA, JJ WILSON, JJ SMITH, MK WINTERSGILL, MC COUGHLIN, CS MAZAUD, P GREENBAUM, SG SIDDON, RL TI ELECTRICAL RELAXATION IN POLY(PROPYLENE OXIDE) WITH AND WITHOUT ALKALI-METAL SALTS SO SOLID STATE IONICS LA English DT Article ID DIELECTRIC-RELAXATION; DECAY FUNCTION; HIGH-PRESSURE; CONDUCTIVITY; NMR; MODELS; DSC AB Previously published audio frequency complex impedance studies of poly(propylene oxide) (PPO) containing various ions at pressures up to 0.6 GPa over the temperature range 250-350 K have been reanalyzed in terms of electric modulus. Peaks in the electric modulus plots (conductivity relaxation) are found which are characterized in terms of the stretched exponential. It is shown that those fits are not perfect, in part due to the presence of a low temperature relaxation. As a consequence, different values of the stretched exponential parameter, beta(SE), are obtained when different portions of the curve are analyzed. That effect results in an apparent increase in beta(SE) with increasing temperature or decreasing pressure. However, when the same portion of the peak is fit, beta(SE) is found to be approximately 0.5 and independent of temperature and pressure. Next, data for the alpha-relaxation in pure PPO were reanalyzed. It is shown that while the value of beta(SE) for the alpha-relaxation data is similar to the values determined for the conductivity relaxation, beta(SE) for the electric modulus representation of the alpha-relaxation data is somewhat smaller. In addition, the temperature dependence of the average relaxation time for the electric modulus representation is better fit by the BENSH equation than by the Vogel equation while the opposite is true for the dielectric constant data. C1 CUNY HUNTER COLL,DEPT PHYS,NEW YORK,NY 10021. ANNE ARUNDEL MED CTR,ANNAPOLIS,MD 21402. RP FONTANELLA, JJ (reprint author), USN ACAD,DEPT PHYS,ANNAPOLIS,MD 21402, USA. NR 45 TC 22 Z9 22 U1 2 U2 3 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0167-2738 J9 SOLID STATE IONICS JI Solid State Ion. PD FEB PY 1992 VL 50 IS 3-4 BP 259 EP 271 DI 10.1016/0167-2738(92)90228-H PG 13 WC Chemistry, Physical; Physics, Condensed Matter SC Chemistry; Physics GA HP483 UT WOS:A1992HP48300011 ER PT J AU Merwin, LH Sebald, A AF Merwin, L. H. Sebald, A. TI Cross-polarisation to low-gamma nuclei: the first W-183 CP/MAS spectra SO SOLID STATE NUCLEAR MAGNETIC RESONANCE LA English DT Article DE high-resolution solid-state NMR; cross-polarisation; W-183 CP/MAS AB The possibility to obtain W-183 CP/MAS spectra has been explored. The choice of suitable set-up compounds, convenient set-up procedures and experimental considerations with respect to contact times, T-IS and T-1 rho interplay, are discussed. C1 [Merwin, L. H.; Sebald, A.] Univ Bayreuth, Bayer Geoinst, Bayreuth, Germany. RP Merwin, LH (reprint author), USN, Ctr Weap, Code 3851, China Lake, CA 93555 USA. FU Deutsche Forschungsgemeinschaft; F. Seifert, Bayerisches Geo-Institut FX Support of our work by the Deutsche Forschungsgemeinschaft and by F. Seifert, Bayerisches Geo-Institut is gratefully acknowledged. We thank W. Knoller, Bruker Analytische Messtechnik, for providing a suitable pre-amplifier matching box, and H. Alt, Universitat Bayreuth, for his gift of organo-tungsten compounds. NR 9 TC 2 Z9 2 U1 0 U2 5 PU ACADEMIC PRESS INC ELSEVIER SCIENCE PI SAN DIEGO PA 525 B ST, STE 1900, SAN DIEGO, CA 92101-4495 USA SN 0926-2040 J9 SOLID STATE NUCL MAG JI Solid State Nucl. Magn. Reson. PD FEB PY 1992 VL 1 IS 1 BP 45 EP 47 DI 10.1016/0926-2040(92)90009-X PG 3 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical; Physics, Condensed Matter; Spectroscopy SC Chemistry; Physics; Spectroscopy GA V26HP UT WOS:000208537000008 PM 1365713 ER PT J AU SHAFFER, AL FALKWADE, JA TORTORELLI, V CIGAN, A CARTER, C HASSAN, K HURLEY, CK AF SHAFFER, AL FALKWADE, JA TORTORELLI, V CIGAN, A CARTER, C HASSAN, K HURLEY, CK TI HLA-DRW52-ASSOCIATED DRB1 ALLELES - IDENTIFICATION USING POLYMERASE CHAIN REACTION-AMPLIFIED DNA, SEQUENCE-SPECIFIC OLIGONUCLEOTIDE PROBES, AND A CHEMILUMINESCENT DETECTION SYSTEM SO TISSUE ANTIGENS LA English DT Article DE HLA-DR; DRW52 FAMILY; OLIGONUCLEOTIDE PROBES; PCR ID AMPLIFICATION; POLYMORPHISM; HAPLOTYPES; ANTIGENS AB Polymerase chain reaction (PCR) primers were designed to specifically amplify exon 2 of the DRw52-associated DRB1 alleles for subsequent typing by sequence-specific oligonucleotide probe (SSOP) hybridization and chemiluminescent detection. The DRw52 DRB1 group, encoding 22 of the 44 W.H.O. designated DRB1 allelic products, was divided by differential PCR with two polymorphism-directed forward primers. Based on a polymorphism at codon 13, these forward primers separate the DRw52-associated alleles into subsets; one comprised of the alleles of DR3/DRw11/DRw6 and the other of DRw8/DRw12/DRB1*1404. The DRB1 alleles in the latter subset were then defined by SSOP hybridization to the amplified DNA. The preferential amplification also resulted in SSOP definition of 15 alleles in the DR3/DRw11/DRw6 subset but some DRw11/DRw13 heterozygous allelic combinations were still unresolved. Two reverse PCR primers specific for the polymorphism at codon 86 were used to obtain amplified material to which SSOP reactivity provided definitive identification of the ambiguous heterozygotes. C1 GEORGETOWN UNIV,SCH MED,DEPT MICROBIOL,3900 RESERVOIR RD NW,WASHINGTON,DC 20007. GEORGETOWN UNIV,DEPT PEDIAT,WASHINGTON,DC 20007. USN,MED RES INST,BETHESDA,MD 20814. GEOCENTERS INC,FT WASHINGTON,MD. UNIV TORONTO,TORONTO M5S 1A1,ONTARIO,CANADA. FU NCI NIH HHS [1P30-CA-51008] NR 20 TC 47 Z9 47 U1 0 U2 0 PU MUNKSGAARD INT PUBL LTD PI COPENHAGEN PA 35 NORRE SOGADE, PO BOX 2148, DK-1016 COPENHAGEN, DENMARK SN 0001-2815 J9 TISSUE ANTIGENS JI Tissue Antigens PD FEB PY 1992 VL 39 IS 2 BP 84 EP 90 DI 10.1111/j.1399-0039.1992.tb01912.x PG 7 WC Cell Biology; Immunology; Pathology SC Cell Biology; Immunology; Pathology GA HH641 UT WOS:A1992HH64100006 PM 1574802 ER PT J AU LOWREY, AH WILLIAMS, RW AF LOWREY, AH WILLIAMS, RW TI EFFECTS OF HYDRATION ON SCALE FACTORS FOR ABINITIO FORCE-CONSTANTS .2. SO THEOCHEM-JOURNAL OF MOLECULAR STRUCTURE LA English DT Article ID INTERMOLECULAR POTENTIAL FUNCTIONS; ALA-X PEPTIDES; VIBRATIONAL FREQUENCIES; COUNTERPOISE CORRECTIONS; BONDED COMPLEXES; FIELD; SCF; METHYLAMINE; INTENSITIES; SPECTRA AB Experimentally measured vibrational frequencies from the polar groups of peptides in aqueous solutions do not agree with frequencies calculated from scaled quantum mechanical force fields (SQMFF) using differential scale factors developed for molecules in the vapor phase. Measured stretching frequencies for carbonyl groups are more than 50 wavenumbers lower than the calculated values. On the other hand, frequencies for non-polar groups calculated using these scale factors are relatively accurate. Our goal is to develop a SQMFF that yields accurate calculated frequencies for peptides in aqueous solutions. To achieve this goal, it has been necessary to obtain scale factors for smaller hydrated molecules that can be used as a starting point for calculations on peptides. To this end, we have calculated scale factors for ab initio force constants for methylamine and protonated methylamine using a least-squares fit of calculated and experimental frequencies. We present a comparison of the experimental and calculated frequencies, along with their potential energy distributions, for both vapor and aqueous phases. We compare the scale factors derived from our measurements with changes observed in the ab initio force constants calculated for these molecules at various states of hydration. These force constants are calculated using fully optimized geometries for these hydrated molecules using the 4-31G, 4-31G**, 6-31G+, and 6-311G** basis sets. The results here are similar in consistency with those found in our previous calculations on formic acid, acetic acid and acetone. The differences in scale factors between vapor and aqueous phase molecules are smaller than those previously found for polar groups, indicating that methylamine exhibits relatively non-polar behavior in solution with respect to its vibrational spectrum. C1 UNIFORMED SERV UNIV HLTH SCI,DEPT BIOCHEM,4301 JONES BRIDGE RD,BETHESDA,MD 20814. USN,RES LAB,STRUCT MATTER LAB,WASHINGTON,DC 20375. NR 29 TC 0 Z9 0 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0166-1280 J9 THEOCHEM-J MOL STRUC JI Theochem-J. Mol. Struct. PD JAN 31 PY 1992 VL 85 BP 35 EP 56 PG 22 WC Chemistry, Physical SC Chemistry GA HE635 UT WOS:A1992HE63500005 ER PT J AU LOWREY, AH WILLIAMS, RW AF LOWREY, AH WILLIAMS, RW TI EFFECTS OF HYDRATION ON SCALE FACTORS FOR ABINITIO FORCE-CONSTANTS .3. SUPERMOLECULES SO THEOCHEM-JOURNAL OF MOLECULAR STRUCTURE LA English DT Article ID ALA-X PEPTIDES; COUNTERPOISE CORRECTIONS; VIBRATIONAL FREQUENCIES; ELECTRON CORRELATION; COMPLEXES; INTENSITIES; SYSTEMS; SPECTRA; ERRORS; ENERGY AB Experimentally measured vibrational frequencies from the polar groups of peptides in aqueous solutions do not agree with frequencies calculated from scaled quantum mechanical force fields (SQMFF) using differential scale factors developed for molecules in the vapor phase. Measured frequencies often differ by more than 50 wavenumbers from calculated values. In order to obtain a more reliable interpretation of our measurements, we need a force field that incorporates the effects of solvation on peptides. Calculations on such systems require the use of small basis sets because of current limitations on computational resources. The primary focus of this work is the use of supermolecule calculations, using a relatively small basis set, 4-31G, as a simulation of the effects of hydration on force constants and corresponding vibrational frequencies. In the context of the SQMFF methodology, it appears that supermolecule calculations provide a better model for the effect of solvation on force constants than do calculations on isolated molecules. We present here an analysis of the effects of basis set superposition error (BSSE), of basis set quality, and of electron correlation at the MP2 level on the vibrational frequencies and force constants obtained from ab initio supermolecule calculations. Our goal is to test the usefulness of the relatively small 4-31G basis set in this context. We show here the results of our calculations on formic acid hydrogen-bonded to water. The simplicity of this system allows comparisons with calculations using much larger basis sets, and with correlation effects at the MP2 level of theory. We make the following observations. Scaled force matrices obtained using different basis sets, and using MP2 calculations, are similar. Supermolecule calculations using different basis sets, and at the MP2 level, produce similar shifts in diagonal force constants (from values obtained from isolated molecules). The BSSE does not significantly affect the calculation of frequencies. Supermolecule calculations, and scaling of force constants obtained using small basis sets are useful strategies for simulating the effects of hydration. C1 UNIFORMED SERV UNIV HLTH SCI,DEPT BIOCHEM,4301 JONES BRIDGE RD,BETHESDA,MD 20814. USN,RES LAB,STRUCT MATTER LAB,WASHINGTON,DC 20375. NR 33 TC 0 Z9 0 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0166-1280 J9 THEOCHEM-J MOL STRUC JI Theochem-J. Mol. Struct. PD JAN 31 PY 1992 VL 85 BP 57 EP 72 PG 16 WC Chemistry, Physical SC Chemistry GA HE635 UT WOS:A1992HE63500006 ER PT J AU KERSEY, AD BERKOFF, TA MOREY, WW AF KERSEY, AD BERKOFF, TA MOREY, WW TI HIGH-RESOLUTION FIBER-GRATING BASED STRAIN SENSOR WITH INTERFEROMETRIC WAVELENGTH-SHIFT DETECTION SO ELECTRONICS LETTERS LA English DT Article DE OPTICAL FIBERS; OPTICAL SENSORS ID SCHEME AB A technique for the detection of dynamic strain induced wavelength shifts in fibre Bragg grating sensors is reported that is based on an unbalanced-interferometer wavelength discriminator, which is capable of subnanostrain resolution (0.6 nc/square-root(Hz) at 500 Hz) sensing. C1 UNITED TECHNOL RES CTR,E HARTFORD,CT 06108. RP KERSEY, AD (reprint author), USN,RES LAB,OPT TECH BRANCH,CODE 6574,WASHINGTON,DC 20375, USA. NR 5 TC 330 Z9 392 U1 4 U2 31 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 30 PY 1992 VL 28 IS 3 BP 236 EP 238 DI 10.1049/el:19920146 PG 3 WC Engineering, Electrical & Electronic SC Engineering GA HC926 UT WOS:A1992HC92600015 ER PT J AU KRUPPA, W BOOS, JB AF KRUPPA, W BOOS, JB TI OBSERVATION OF DC AND MICROWAVE NEGATIVE DIFFERENTIAL RESISTANCE IN INAIAS INGAAS INP HEMTS SO ELECTRONICS LETTERS LA English DT Article DE MICROWAVE DEVICES; FIELD-EFFECT TRANSISTORS; NEGATIVE DIFFERENTIAL RESISTANCE; SEMICONDUCTOR DEVICES AND MATERIALS ID MODFETS AB Negative differential resistance, as evidenced by DC and microwave measurements, has been observed in InAlAs/InGaAs/InP HEMTs. This behaviour, which occurs at high drain voltages in short-gate-length devices, appears to be related to that observed in some other heterojunction field-effect transistors and is attributed to the real-space transfer of carriers from the channel into the donor layer. C1 USN,RES LAB,WASHINGTON,DC 20375. RP KRUPPA, W (reprint author), SFA INC,LANDOVER,MD 20785, USA. NR 6 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 JAN 30 PY 1992 VL 28 IS 3 BP 267 EP 269 DI 10.1049/el:19920165 PG 3 WC Engineering, Electrical & Electronic SC Engineering GA HC926 UT WOS:A1992HC92600034 ER PT J AU DAVIS, AR PATRICK, SS DANDRIDGE, A BUCHOLTZ, F AF DAVIS, AR PATRICK, SS DANDRIDGE, A BUCHOLTZ, F TI REMOTE FIBEROPTIC AC MAGNETOMETER SO ELECTRONICS LETTERS LA English DT Article DE FIBEROPTICS; OPTICAL SENSORS ID SENSORS AB A remotely operated fibre-optic magnetometer was fabricated and tested. The system has a real time flat frequency response (+/- 3 dB) across the entire band of 1-45 kHz with a minimum detectable magnetic field of 1.8 x 10 7Gauss/square-root(Hz). The sensor is compact and contains no electronic or active components. C1 UNIV MARYLAND,RES FDN,GREENBELT,MD 20770. VIRGINIA POLYTECH INST & STATE UNIV,BLACKSBURG,VA 24061. RP DAVIS, AR (reprint author), USN,RES LAB,CODE 6570,WASHINGTON,DC 20375, USA. NR 6 TC 2 Z9 2 U1 0 U2 1 PU IEE-INST ELEC ENG PI HERTFORD PA MICHAEL FARADAY HOUSE SIX HILLS WAY STEVENAGE, HERTFORD, ENGLAND SG1 2AY SN 0013-5194 J9 ELECTRON LETT JI Electron. Lett. PD JAN 30 PY 1992 VL 28 IS 3 BP 271 EP 273 DI 10.1049/el:19920167 PG 3 WC Engineering, Electrical & Electronic SC Engineering GA HC926 UT WOS:A1992HC92600036 ER PT J AU SHLESINGER, MF AF SHLESINGER, MF TI STATISTICAL PHYSICS - NEW PATHS FOR RANDOM WALKERS SO NATURE LA English DT Editorial Material ID RELAXATION; REPTATION; MODEL RP OFF NAVAL RES, DIV PHYS, ARLINGTON, VA 22217 USA. NR 9 TC 21 Z9 21 U1 0 U2 1 PU NATURE PUBLISHING GROUP PI LONDON PA MACMILLAN BUILDING, 4 CRINAN ST, LONDON N1 9XW, ENGLAND SN 0028-0836 EI 1476-4687 J9 NATURE JI Nature PD JAN 30 PY 1992 VL 355 IS 6359 BP 396 EP 397 DI 10.1038/355396a0 PG 2 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA HB530 UT WOS:A1992HB53000032 ER PT J AU WALTON, TR GRATZ, RF AF WALTON, TR GRATZ, RF TI ENVIRONMENTALLY STABLE CONDUCTIVE POLYMERS FROM BIS(ETHYNYLSTYRYL) BENZENE MONOMERS SO JOURNAL OF APPLIED POLYMER SCIENCE LA English DT Article AB Several completely conjugated, all-carbon-hydrogen acetylene-terminated monomers, bis(ethynylstyryl)benzenes, were synthesized using the Wittig reaction with ethynyl-benzaldehyde and xylyldiphosphonium salts. These prepolymers were thermally polymerized in the melt phase into thermally stable materials that can be further processed into conductive polymers having high stability to aggressive environments. Conductivity can range from that of an insulator to 10+2 s/cm. The room temperature conductivity is unchanged by extended exposure to boiling water or 500-degrees-C in an inert atmosphere. With proper design of the monomers' structures, they will melt sufficiently below the polymerization temperature to provide an adequate time in the liquid state for ease of processing. Once cured into the solid form, the materials are intractable and exhibit high stability to aggressive environments. C1 MARY WASHINGTON COLL,FREDERICKSBURG,VA 22401. RP WALTON, TR (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 9 TC 14 Z9 14 U1 2 U2 3 PU JOHN WILEY & SONS INC PI NEW YORK PA 605 THIRD AVE, NEW YORK, NY 10158-0012 SN 0021-8995 J9 J APPL POLYM SCI JI J. Appl. Polym. Sci. PD JAN 25 PY 1992 VL 44 IS 3 BP 387 EP 399 DI 10.1002/app.1992.070440303 PG 13 WC Polymer Science SC Polymer Science GA GW097 UT WOS:A1992GW09700003 ER PT J AU RICE, JK PASTERNACK, L NELSON, HH AF RICE, JK PASTERNACK, L NELSON, HH TI EINSTEIN TRANSITION-PROBABILITIES FOR THE A1H A1-PI-X1-SIGMA+ TRANSITION SO CHEMICAL PHYSICS LETTERS LA English DT Article ID LIFETIMES; SPECTRA; STATES; ALH; AIH; BH AB Ratios of the Einstein transition probabilities, band oscillator strengths and vibrational transition probabilities for the (0,0) and (0,1) bands and the (1,0), (1,1), and (1,2) bands in the AlH A (1)PI - X (1)SIGMA+ transition are measured. These ratios indicate that emission occurs predominantly in the diagonal terms. Using literature values of the lifetimes of the upsilon = 0 and 1 levels, absolute Einstein transition probabilities are derived. RP RICE, JK (reprint author), USN,RES LAB,DIV CHEM,CODE 6110,WASHINGTON,DC 20375, USA. NR 21 TC 6 Z9 8 U1 1 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0009-2614 J9 CHEM PHYS LETT JI Chem. Phys. Lett. PD JAN 24 PY 1992 VL 189 IS 1 BP 43 EP 47 DI 10.1016/0009-2614(92)85150-9 PG 5 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA HD867 UT WOS:A1992HD86700008 ER PT J AU RAY, BK BHANDARI, I CHILLAREGE, R AF RAY, BK BHANDARI, I CHILLAREGE, R TI RELIABILITY GROWTH FOR TYPED DEFECTS SO PROCEEDINGS ANNUAL RELIABILITY AND MAINTAINABILITY SYMPOSIUM LA English DT Article; Proceedings Paper CT 1992 ANNUAL SYMP ON RELIABILITY AND MAINTAINABILITY CY JAN 21-23, 1992 CL LAS VEGAS, NV SP IEEE, INST IND ENGINEERS, AMER SOC QUAL CONTROL, SYSTEM SAFETY SOC, SOC RELIAB ENGINEERS, SOC LOGIST ENGINEERS DE RELIABILITY GROWTH; DEFECT CATEGORIZATION; PROCESS FEEDBACK AB This paper presents a reliability growth model for defects that have been categorized into defect types associated with specific stages in the software development process. Modeling the reliability growth of defects for each type separately allows identification of problems in the development process which may otherwise be masked when defects of all types are modeled together. This paper: .incorporates dependencies, from a failure detection point of view, between defects of two different types into a model for reliability growth. .uses typed defect data from three different software projects to validate the model. .finds that the defect detection rates are not equal for defects of different types within the project. Since each defect type can be associated with a software development stage, comparing the estimated defect detection rates and the dependency between types provides a basis for feedback on the process. RP RAY, BK (reprint author), USN,POSTGRAD SCH,DEPT OPERAT RES,MONTEREY,CA 93940, USA. NR 0 TC 5 Z9 5 U1 0 U2 0 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0149-144X J9 P ANNU REL MAINT SYM JI Proc. Annu. Reliab. Maintainab. Symp. PD JAN 21 PY 1992 IS SYM BP 327 EP 336 DI 10.1109/ARMS.1992.187845 PG 10 WC Engineering, Multidisciplinary; Engineering, Industrial SC Engineering GA HQ114 UT WOS:A1992HQ11400055 ER PT J AU CUKAUSKAS, EJ ALLEN, LH HOLM, RT SHERRILL, GK AF CUKAUSKAS, EJ ALLEN, LH HOLM, RT SHERRILL, GK TI Y1BA2CU3O7-X AND LAALO3 COMPOSITE THIN-FILMS BY OFF-AXIS MAGNETRON SPUTTERING SO APPLIED PHYSICS LETTERS LA English DT Article ID OPTICAL-RESPONSE; SUPERCONDUCTING MICROBOLOMETER AB Thin-film composites of co-sputtered Y1Ba2Cu3O7-x and LaAlO3 have been deposited by off-axis magnetron sputtering. Scanning electron microscopy (SEM) and x-ray diffraction studies suggest that LaAlO3 precipitates along the grain boundaries of the Y1Ba2Cu3O7-x grains. The normal state conductivity, transition temperature, and critical current density systematically decreased with increasing LaAlO3 composition, consistent with a decrease in the coupling between Y1Ba2Cu3O7-x grains. Inductive transition widths were only a few degrees wide for all LaAlO3 compositions, indicating homogeneous materials. Initial photoresponse measurements show bolometric behavior near T(c) and increased response for greater LaAlO3 compositions. RP CUKAUSKAS, EJ (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 12 TC 10 Z9 10 U1 0 U2 0 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0003-6951 J9 APPL PHYS LETT JI Appl. Phys. Lett. PD JAN 20 PY 1992 VL 60 IS 3 BP 389 EP 391 DI 10.1063/1.106665 PG 3 WC Physics, Applied SC Physics GA HA036 UT WOS:A1992HA03600043 ER PT J AU JOHNSTON, KJ GAUME, R STOLOVY, S WILSON, TL WALMSLEY, CM MENTEN, KM AF JOHNSTON, KJ GAUME, R STOLOVY, S WILSON, TL WALMSLEY, CM MENTEN, KM TI THE DISTRIBUTION OF THE 62-61 AND 52-51 E-TYPE METHANOL MASERS IN OMC-1 SO ASTROPHYSICAL JOURNAL LA English DT Article DE ISM, KINEMATICS AND DYNAMICS; ISM, MOLECULES; ISM, STRUCTURE; MASERS ID ORION-KL; CO OUTFLOW; KINEMATICS; NEBULA; REGION; TRANSITIONS; EMISSION; AMMONIA; MAPS AB The 6(2)-6(1) and 5(2)-5(1) E transitions of CH3OH have been mapped toward the Orion-KL region with an angular resolution of 3" and a frequency resolution of 12 kHz (= 0.15 km s-1). There are at least 16 masers of flux density greater than 3 Jy. These are distributed in a 40" long crescent shaped region, extending from NW to SE around the "hot core." The radial velocities and positions of some of these masers agree with a peak of the 8(0)-7(1) A transition of CH3OH, near 95 GHz. The most intense 6(2)-6(1) E maser is unresolved; the flux density of 103 Jy and size of less than 1".1 give a brightness temperature of greater than 10(5) K. The FWHP line widths, including the instrumental resolution, range from less than 0.15 km s-1 (unresolved) to 1 km s-1. What have been previously cataloged as spatially extended individual masers are most likely blends of maser components with slightly different radial velocities. The E-type masers in Orion appear to cluster on scale sizes of less than 3". From a multiline analysis and our limits to maser source sizes, the column densities in the regions with the most intense lines are greater than 2 x 10(22) cm-2. The spatial distribution and the observed velocities suggest that the methanol masers arise from high column density gas-adjacent to the Hot Core. The masers may be located very near the interface of the high-velocity outflow and the surrounding dense gas. C1 MAX PLANCK INST RADIOASTRON,W-5300 BONN 1,GERMANY. HARVARD SMITHSONIAN CTR ASTROPHYS,CAMBRIDGE,MA 02138. RP JOHNSTON, KJ (reprint author), USN,RES LAB,CTR ADV SPACE SENSING,CODE 4200,WASHINGTON,DC 20375, USA. NR 30 TC 47 Z9 47 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 JAN 20 PY 1992 VL 385 IS 1 BP 232 EP 239 DI 10.1086/170930 PN 1 PG 8 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA GZ903 UT WOS:A1992GZ90300021 ER PT J AU KEENAN, FP CONLON, ES HARRA, LK BURKE, VM WIDING, KG AF KEENAN, FP CONLON, ES HARRA, LK BURKE, VM WIDING, KG TI C-IV LINE RATIOS IN THE SUN SO ASTROPHYSICAL JOURNAL LA English DT Article DE ATOMIC PROCESSES; SUN, FLARES; SUN, UV-RADIATION ID ELECTRON-DENSITY; XUV OBSERVATIONS; SPECTRAL-LINES; COMPACT FLARE; SOLAR-FLARES; TEMPERATURE; TOKAMAK; PLASMAS; SKYLAB; IONS AB Recent R-matrix calculations of electron impact excitation rates for transitions in C IV are used to derive the theoretical electron temperature-sensitive emission-line ratios R1 = I(312.43 angstrom)/I(419.74 angstrom), R2 = I(3 84.14 angstrom)/I(419.74 angstrom), R3 = I(312.43 angstrom)/I(419.49 angstrom), and R4 = I(384.14 angstrom)/I(419.49 angstrom). A comparison of these with solar observational data obtained with the Naval Research Laboratory's S082A slitless spectrograph on board Skylab reveals good agreement between theory and observation for R2 and R4, which provides experimental support for the accuracy of the atomic data adopted in the analysis. However, most of the observed values of R1 and R3 lie above the theoretical high-temperature limit, which is probably due to blending of the 312.43 angstrom line. C1 QUEENS UNIV BELFAST,DEPT APPL MATH & THEORET PHYS,BELFAST BT7 1NN,ANTRIM,NORTH IRELAND. USN,RES LAB,EO HULBURT CTR SPACE RES,WASHINGTON,DC 20375. RP KEENAN, FP (reprint author), QUEENS UNIV BELFAST,DEPT PURE & APPL PHYS,BELFAST BT7 1NN,ANTRIM,NORTH IRELAND. OI Harra, Louise/0000-0001-9457-6200 NR 29 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 JAN 20 PY 1992 VL 385 IS 1 BP 381 EP 383 DI 10.1086/170948 PN 1 PG 3 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA GZ903 UT WOS:A1992GZ90300039 ER PT J AU ESTEP, L HOLLOWAY, J AF ESTEP, L HOLLOWAY, J TI ESTIMATORS OF BOTTOM REFLECTANCE SPECTRA SO INTERNATIONAL JOURNAL OF REMOTE SENSING LA English DT Article AB Estimators of in situ bottom spectral reflectance are calculated from multi-station optical field data gathered with standard instrumentation from different sites. These spectra are then compared to reflectance spectra measured in the laboratory of the bottom sediments collected in the field for the stations at these different sites. The relative fit of the estimated spectral curves to those measured in the laboratory was measured. The most accurate absolute estimation was provided by the single scattering irradiance model. RP ESTEP, L (reprint author), USN,OCEANOG & ATMOSPHER RES LAB,DIV MAPPING CHARTING & GEODESY,STENNIS SPACE CTR,MS 39529, USA. NR 9 TC 9 Z9 9 U1 0 U2 1 PU TAYLOR & FRANCIS LTD PI LONDON PA ONE GUNDPOWDER SQUARE, LONDON, ENGLAND EC4A 3DE SN 0143-1161 J9 INT J REMOTE SENS JI Int. J. Remote Sens. PD JAN 20 PY 1992 VL 13 IS 2 BP 393 EP 397 PG 5 WC Remote Sensing; Imaging Science & Photographic Technology SC Remote Sensing; Imaging Science & Photographic Technology GA HD268 UT WOS:A1992HD26800014 ER PT J AU RUIZ, JP DHARIA, JR REYNOLDS, JR BUCKLEY, LJ AF RUIZ, JP DHARIA, JR REYNOLDS, JR BUCKLEY, LJ TI REPEAT UNIT SYMMETRY EFFECTS ON THE PHYSICAL AND ELECTRONIC-PROPERTIES OF PROCESSABLE, ELECTRICALLY CONDUCTING, SUBSTITUTED POLY(1,4-BIS(2-THIENYL)PHENYLENES) SO MACROMOLECULES LA English DT Article ID SOLUBLE POLY(PARA-PHENYLENE)S; CRYSTAL-STRUCTURE; SIDE-CHAINS; POLYTHIOPHENE; POLYMER; BIPOLARONS; POLARONS; FILMS; MELT AB The effect of repeat unit symmetry on the physical and electronic properties of a series of conjugated polymers composed of 2,5-disubstituted 1,4-bis(2-thienyl)phenylene repeat units, symmetrically and asymmetrically substituted with methoxy, heptoxy, dodecyloxy, hexadecyloxy, eicosinoxy, and hexyl groups has been studied. The polymers were prepared via an oxidative polymorization using ferric chloride and isolated after dedoping with ammonium hydroxide. The neutral polymers, soluble in common organic solvents including chloroform, methylene chloride, and tetrahydrofuran, are predominantly linked at the 5 and 5' positions of the thiophene rings to yield fully conjugated main chains that are stable to 360-degrees-C under nitrogen. Molecular weight analyses indicate weight-average degrees of polymerization (X(w)) of ca. 10-20, and, thus, a substantial fraction of chains in each sample contains 30-50 aromatic rings. Differential scanning calorimetry studies revealed that melt transitions, indicative of molecular ordering, are present in the symmetrically substituted polymers. The order found in these polymers was confirmed by X-ray diffraction and was found to persist at elevated temperatures, yielding birefringent melts, suggestive of liquid crystalline order. The asymmetrically substituted polymers were found to be amorphous. Upon oxidation of the insulating polymers, bipolaronic charge carriers were formed with the oxidized polymers exhibiting electrical conductivities up to 4 OMEGA-1 cm-1. C1 UNIV TEXAS,DEPT CHEM,CTR ADV POLYMER RES,ARLINGTON,TX 76019. USN,CTR AIR DEV,POLYMER PHYS GRP,WARMINSTER,PA 18974. NR 42 TC 105 Z9 106 U1 0 U2 2 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0024-9297 J9 MACROMOLECULES JI Macromolecules PD JAN 20 PY 1992 VL 25 IS 2 BP 849 EP 860 DI 10.1021/ma00028a053 PG 12 WC Polymer Science SC Polymer Science GA HB418 UT WOS:A1992HB41800053 ER PT J AU WEISS, GH BENDLER, JT SHLESINGER, MF AF WEISS, GH BENDLER, JT SHLESINGER, MF TI CONTINUOUS-SITE MODEL FOR LANGMUIR GAS SORPTION IN GLASSY-POLYMERS SO MACROMOLECULES LA English DT Note ID POLYCARBONATE C1 GE,CORP RES & DEV,BIOL SCI LAB,SCHENECTADY,NY 12301. NIH,DIV COMP RES & TECHNOL,BETHESDA,MD 20892. USN,OFF RES,DIV PHYS,ARLINGTON,VA 22217. NR 18 TC 29 Z9 29 U1 0 U2 1 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0024-9297 J9 MACROMOLECULES JI Macromolecules PD JAN 20 PY 1992 VL 25 IS 2 BP 990 EP 992 DI 10.1021/ma00028a074 PG 3 WC Polymer Science SC Polymer Science GA HB418 UT WOS:A1992HB41800074 ER PT J AU WILLIAMS, S CRISTOLOVEANU, S CAMPISI, G AF WILLIAMS, S CRISTOLOVEANU, S CAMPISI, G TI POINT CONTACT PSEUDO-METAL OXIDE SEMICONDUCTOR TRANSISTOR IN AS-GROWN SILICON ON INSULATOR WAFERS SO MATERIALS SCIENCE AND ENGINEERING B-SOLID STATE MATERIALS FOR ADVANCED TECHNOLOGY LA English DT Article; Proceedings Paper CT SYMP AT THE 1991 SPRING MEETING OF THE EUROPEAN MATERIALS RESEARCH SOC : ION BEAM SYNTHESIS OF COMPOUND AND ELEMENTAL LAYERS CY MAY 28-31, 1991 CL STRASBOURG, FRANCE SP EUROPEAN MAT RES SOC AB A pseudo-metal/oxide/semiconductor transistor can be operated in situ in as-grown silicon on insulator materials. The measurement set-up and typical transistor characteristics are discussed. Methods are proposed to extract the basic parameters of minority and majority carriers, the buried oxide and Si-SiO2 interface. The influence of the major experimental conditions is analyzed. C1 USN,RES LAB,WASHINGTON,DC 20375. RP WILLIAMS, S (reprint author), INST NATL POLYTECH GRENOBLE,ECOLE NATL SUPER ELECTR & RADIOELECTR GRENOBLE,CNRS,F-38016 GRENOBLE,FRANCE. NR 5 TC 5 Z9 5 U1 0 U2 0 PU ELSEVIER SCIENCE SA LAUSANNE PI LAUSANNE 1 PA PO BOX 564, 1001 LAUSANNE 1, SWITZERLAND SN 0921-5107 J9 MAT SCI ENG B-SOLID JI Mater. Sci. Eng. B-Solid State Mater. Adv. Technol. PD JAN 20 PY 1992 VL 12 IS 1-2 BP 191 EP 194 DI 10.1016/0921-5107(92)90284-G PG 4 WC Materials Science, Multidisciplinary; Physics, Condensed Matter SC Materials Science; Physics GA HE158 UT WOS:A1992HE15800037 ER PT J AU SHLESINGER, MF KLAFTER, J AF SHLESINGER, MF KLAFTER, J TI ANALYSIS OF THE DISPERSIVE DIFFUSION OF ATOMS IN DISORDERED SOLIDS - COMMENT SO PHYSICAL REVIEW LETTERS LA English DT Letter C1 TEL AVIV UNIV, SCH CHEM, IL-69978 TEL AVIV, ISRAEL. RP USN, OFF RES, DIV PHYS, 800 N QUINCY ST, ARLINGTON, VA 22217 USA. NR 4 TC 2 Z9 2 U1 0 U2 0 PU AMER PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0031-9007 EI 1079-7114 J9 PHYS REV LETT JI Phys. Rev. Lett. PD JAN 20 PY 1992 VL 68 IS 3 BP 414 EP 414 DI 10.1103/PhysRevLett.68.414 PG 1 WC Physics, Multidisciplinary SC Physics GA GZ967 UT WOS:A1992GZ96700043 ER PT J AU KAFAFI, ZH LINDLE, JR PONG, RGS BARTOLI, FJ LINGG, LJ MILLIKEN, J AF KAFAFI, ZH LINDLE, JR PONG, RGS BARTOLI, FJ LINGG, LJ MILLIKEN, J TI OFF-RESONANT NONLINEAR OPTICAL-PROPERTIES OF C60 STUDIED BY DEGENERATE 4-WAVE-MIXING SO CHEMICAL PHYSICS LETTERS LA English DT Article ID BUCKMINSTERFULLERENE; CARBON; C-60 AB Pure C60 was deposited on optical substrates in vacuo and spectroscopically characterized. A small linear absorption coefficient-alpha = 6 cm-1 was measured at 1.064-mu-m. Time-resolved degenerate four-wave mixing experiments were conducted on films of pure C60 using a 35 ps Nd: YAG laser at 1.064-mu-m. The third-order optical susceptibility chi(xxxx)(3) of C60, derived from its phase conjugate signal. is 7 X 10(-12) esu. The nonlinear optical temporal response was largely laser-pulse limited. Evidence for a fifth-order contribution to the nonlinear optical response was observed at high laser intensities. RP KAFAFI, ZH (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. RI Lindle, James/A-9426-2009 NR 23 TC 207 Z9 208 U1 1 U2 9 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0009-2614 J9 CHEM PHYS LETT JI Chem. Phys. Lett. PD JAN 17 PY 1992 VL 188 IS 5-6 BP 492 EP 496 DI 10.1016/0009-2614(92)80854-5 PG 5 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA HC636 UT WOS:A1992HC63600023 ER PT J AU GOPALAKRISHNAN, GK BURNS, WK BULMER, CH AF GOPALAKRISHNAN, GK BURNS, WK BULMER, CH TI ELECTRICAL LOSS MECHANISMS IN TRAVELING-WAVE LINBO3 OPTICAL MODULATORS SO ELECTRONICS LETTERS LA English DT Article DE OPTICAL MODULATION; LOSSES; INTEGRATED OPTICS AB Anomalous electrical losses in travelling wave LiNbO3 optical modulators are attributed to phase matched mode coupling between the coplanar waveguide mode and off-axis substrate modes. Experimental results support the model. C1 MARYLAND ADV DEV LAB,GREENBELT,MD 20770. RP GOPALAKRISHNAN, GK (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 7 TC 37 Z9 39 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 JAN 16 PY 1992 VL 28 IS 2 BP 207 EP 209 DI 10.1049/el:19920129 PG 3 WC Engineering, Electrical & Electronic SC Engineering GA HA946 UT WOS:A1992HA94600066 ER PT J AU GEORGE, C PURDY, A AF GEORGE, C PURDY, A TI STRUCTURE OF (MU-OXALATO)-TRANS-BIS[N,N,N',N'-TETRAMETHYLETHYLENEDIAMINE-PERFLUORO-TE RT-BUTOXYCOPPER(II)] BENZENE SOLVATE SO ACTA CRYSTALLOGRAPHICA SECTION C-CRYSTAL STRUCTURE COMMUNICATIONS LA English DT Note ID OXALATO AB (mu-Oxalato)-trans-bis[N,N,N',N'-tetramethylethylenediamineperfluoro-tert-butoxy-copper(II)] benzene solvate, C22H32Cu2F18N4O6-C6H6, M(r) = 995.70, monoclinic, C2/m, a = 14.581 (5), b = 12.484 (4), c = 13.239 (5) angstrom, beta = 123.05 (2)-degrees, V = 2019.9 (12) angstrom 3, Z = 2, D(x) = 1.637 Mg m-3, lambda(Mo K-alpha) = 0.71073 angstrom, mu = 1.18 mm-1, F(000) = 1004, T = 295 K, final R = 0.055, wR = 0.067 for 1629 independent observed reflections. The distorted square-pyramidal five-coordinate Cu(II) complex and the benzene solvate both have C2h molecular symmetry. The asymmetric unit consists of 1/4 of the Cu complex and 1/4 of the solvate molecule. All of the CF3 groups are poorly defined and the fluorines of one of the crystallographically independent CF3 groups were treated as a disorder with occupancies of 52 and 48% respectively. C1 SFA INC,LANDOVER,MD 20785. RP GEORGE, C (reprint author), USN,RES LAB,STRUCT MATTER LAB,WASHINGTON,DC 20375, USA. NR 3 TC 10 Z9 10 U1 0 U2 1 PU MUNKSGAARD INT PUBL LTD PI COPENHAGEN PA 35 NORRE SOGADE, PO BOX 2148, DK-1016 COPENHAGEN, DENMARK SN 0108-2701 J9 ACTA CRYSTALLOGR C JI Acta Crystallogr. Sect. C-Cryst. Struct. Commun. PD JAN 15 PY 1992 VL 48 BP 155 EP 157 DI 10.1107/S0108270191003232 PN 1 PG 3 WC Chemistry, Multidisciplinary; Crystallography SC Chemistry; Crystallography GA HB163 UT WOS:A1992HB16300057 ER PT J AU SPRATT, JS SPRATT, SW AF SPRATT, JS SPRATT, SW TI LEGAL PERSPECTIVES ON MAMMOGRAPHY AND SELF-REFERRAL SO CANCER LA English DT Article ID BREAST-CANCER C1 USN HOSP,DEPT LEGAL,OAKLAND,CA. RP SPRATT, JS (reprint author), UNIV LOUISVILLE,SCH MED,DEPT SURG,JAMES GRAHAM BROWN CANC CTR,LOUISVILLE,KY 40292, USA. NR 11 TC 5 Z9 5 U1 0 U2 0 PU WILEY-LISS PI NEW YORK PA DIV JOHN WILEY & SONS INC 605 THIRD AVE, NEW YORK, NY 10158-0012 SN 0008-543X J9 CANCER JI Cancer PD JAN 15 PY 1992 VL 69 IS 2 BP 599 EP 600 DI 10.1002/1097-0142(19920115)69:2<599::AID-CNCR2820690252>3.0.CO;2-R PG 2 WC Oncology SC Oncology GA GY837 UT WOS:A1992GY83700051 PM 1728392 ER PT J AU SCHULZ, N PROPST, F ROSENBERG, MP LINNOILA, RI PAULES, RS KOVATCH, R OGISO, Y VANDEWOUDE, G AF SCHULZ, N PROPST, F ROSENBERG, MP LINNOILA, RI PAULES, RS KOVATCH, R OGISO, Y VANDEWOUDE, G TI PHEOCHROMOCYTOMAS AND C-CELL THYROID NEOPLASMS IN TRANSGENIC C-MOS MICE - A MODEL FOR THE HUMAN MULTIPLE ENDOCRINE NEOPLASIA TYPE-2 SYNDROME SO CANCER RESEARCH LA English DT Article ID PROTO-ONCOGENE PRODUCT; DETERMINES METHYLATION; MEIOTIC MATURATION; MOUSE-TISSUES; EXPRESSION; CHROMOSOME-10; TRANSCRIPTS; MECHANISM; OOCYTES AB Transgenic mice carrying and expressing a mos protooncogene, linked to the Moloney murine sarcoma virus long terminal repeat, develop severe neurological defects and lens abnormalities. Here we report that after long latent periods, mice in three of four of these mos transgenic lines develop a high frequency of multicentric pheochromocytomas and/or medullary thyroid neoplasms. The pattern of tumor formation is remarkably similar to the human autosomal dominantly inherited neoplastic syndrome, multiple endocrine neoplasia type 2 (MEN 2), and tumors from these transgenic animals display the same neuroendocrine marker staining pattern as seen in MEN 2. The similarity between the tumor pathologies and presentation patterns of MEN 2 patients and mos transgenic mice suggests that they may arise through related pathways. The type of tumor presentation varies in a line-dependent manner indicating that there is interaction between the transgene and the genetic background. Moreover, when the non-tumor-bearing mos transgenic line is crossed to a different mouse background, the F1 offspring display the MEN 2 phenotype. These studies indicate that penetrance of the autosomal dominant mos transgenic phenotype is dependent on both integration site and background. C1 ST MARYS HOSP,SCH MED,LUDWIG INST CANC RES,LONDON W2 1PG,ENGLAND. SQUIBB INST CANC RES,DEPT MOLEC BIOL,PRINCETON,NJ 08543. USN HOSP,MED ONCOL BRANCH,NCI,BETHESDA,MD 20814. RP SCHULZ, N (reprint author), NCI,FREDERICK CANC RES & DEV CTR,ABL BASIC RES PROGRAM,FREDERICK,MD 21701, USA. FU NCI NIH HHS [N01-CO-74101] NR 29 TC 35 Z9 35 U1 0 U2 0 PU AMER ASSOC CANCER RESEARCH PI PHILADELPHIA PA PUBLIC LEDGER BLDG, SUITE 816, 150 S. INDEPENDENCE MALL W., PHILADELPHIA, PA 19106 SN 0008-5472 J9 CANCER RES JI Cancer Res. PD JAN 15 PY 1992 VL 52 IS 2 BP 450 EP 455 PG 6 WC Oncology SC Oncology GA GZ693 UT WOS:A1992GZ69300033 PM 1345812 ER PT J AU HERLING, GH RUSTGI, ML AF HERLING, GH RUSTGI, ML TI SPATIALLY DEPENDENT EFFECTIVE MASS AND OPTICAL-PROPERTIES IN FINITE PARABOLIC QUANTUM-WELLS SO JOURNAL OF APPLIED PHYSICS LA English DT Article ID ELECTRIC-FIELD DEPENDENCE; HETEROJUNCTIONS AB The effects of the spatial dependence of the effective mass in GaAs/AlxGa1-xAs parabolic quantum wells on several of their optical properties have been calculated. The largest effects are on the conduction-band levels which are lowered with respect to those with constant effective mass. Effects on oscillator strengths, hole energy levels, and electron/hole overlaps are small. C1 SUNY BUFFALO,DEPT PHYS & ASTRON,BUFFALO,NY 14260. RP HERLING, GH (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 15 TC 23 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 JAN 15 PY 1992 VL 71 IS 2 BP 796 EP 799 DI 10.1063/1.351401 PG 4 WC Physics, Applied SC Physics GA HA645 UT WOS:A1992HA64500041 ER PT J AU DEREGGI, AS DICKENS, B DITCHI, T ALQUIE, C LEWINER, J LLOYD, IK AF DEREGGI, AS DICKENS, B DITCHI, T ALQUIE, C LEWINER, J LLOYD, IK TI DETERMINATION OF THE POLARIZATION-DEPTH DISTRIBUTION IN POLED FERROELECTRIC CERAMICS USING THERMAL AND PRESSURE PULSE TECHNIQUES SO JOURNAL OF APPLIED PHYSICS LA English DT Article ID CHARGE; DIELECTRICS; ELECTRETS AB This paper is the first of a series with the common theme of comparing thermal and acoustic pulse methods of measuring charge or polarization profiles across the thickness of slab-shaped samples that are representative of different types of materials. In this paper, thermal and pressure pulse measurements are reported of the polarization distribution in poled, ferroelectric ceramic samples. The results obtained from both methods are complementary so that there is a benefit to using both. The results also demonstrate that large deviations from uniform polarization can be induced by processing differences. C1 ECOLE SUPER PHYS & CHIM IND,F-75231 PARIS 05,FRANCE. USN,RES LAB,WASHINGTON,DC 20375. RP DEREGGI, AS (reprint author), NIST,GAITHERSBURG,MD 20899, USA. RI Lloyd, Isabel/B-1513-2012 NR 17 TC 27 Z9 27 U1 0 U2 2 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0021-8979 J9 J APPL PHYS JI J. Appl. Phys. PD JAN 15 PY 1992 VL 71 IS 2 BP 854 EP 863 DI 10.1063/1.351306 PG 10 WC Physics, Applied SC Physics GA HA645 UT WOS:A1992HA64500051 ER PT J AU BUTLER, JC KRAMER, JJ LEE, JN INGS, JB BELT, RF AF BUTLER, JC KRAMER, JJ LEE, JN INGS, JB BELT, RF TI OPTICAL AND ELECTRICAL CHARACTERIZATION OF MAGNESIUM-DOPED BISMUTH SUBSTITUTED LUTETIUM IRON-GARNET THIN-FILMS SO JOURNAL OF APPLIED PHYSICS LA English DT Article ID LIQUID-PHASE EPITAXY; ABSORPTION; REDUCTION; CURRENTS; WAVE AB Near-infrared optical absorption and Faraday rotation have been studied, in addition to the room-temperature sheet resistance, in a series of magnesium-doped bismuth substituted lutetium iron garnet (Bi:LuIG) thin films grown by liquid phase epitaxy. Faraday rotation was measured at 1150 and 1300 nm as a function of the MgO concentration in the melt. Optical absorption data indicate valence exchange as a possible mechanism for increased optical absorption at compositions different from charge compensation. Faraday rotation data display a magnesium doping dependent behavior, as do the I-V characteristics. Additionally, the I-V data of unetched and etched films near compensation suggest a two-layer structure to the films. C1 USN,RES LAB,WASHINGTON,DC 20375. LITTON SYST DIV INC,AIRTRON DIV,MORRIS PLAINS,NJ 07950. RP BUTLER, JC (reprint author), UNIV DELAWARE,DEPT ELECT ENGN,NEWARK,DE 19716, USA. NR 25 TC 2 Z9 2 U1 1 U2 4 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0021-8979 J9 J APPL PHYS JI J. Appl. Phys. PD JAN 15 PY 1992 VL 71 IS 2 BP 924 EP 928 DI 10.1063/1.351314 PG 5 WC Physics, Applied SC Physics GA HA645 UT WOS:A1992HA64500059 ER PT J AU STACK, GM BEUMEL, LL AF STACK, GM BEUMEL, LL TI THE EFFECT OF ANNEALING ON THE THERMAL AND DYNAMIC MECHANICAL-PROPERTIES OF PARA-TETRAMETHYL XYLENE DIISOCYANATE-BASED POLYURETHANES SO JOURNAL OF APPLIED POLYMER SCIENCE LA English DT Article ID SEGMENTED POLYURETHANES; TIME-DEPENDENCE; ELASTOMERS; SEPARATION; URETHANES; BEHAVIOR AB A series of polyurethane elastomers based on the para-Tetramethyl Xylene diisocyanate group were annealed at temperatures from 100 to 180-degrees-C. These high-temperature exposures were found to raise significantly the peak melting point of the urethanes that contained crystalline hard segments. The corresponding enthalpy of fusion was found to decrease after annealing at the higher temperatures. In most cases, the annealings caused a slight increase in the soft-segment glass transition temperature, indicating that some increase in phase mixing had occurred. Dynamic mechanical measurements indicated that the annealings caused a slight reduction in the Young's modulus and a broadening of the loss-tangent peak. The broadening of the loss-tangent peak can be attributed to the increased phase mixing induced by the annealings. The large increases in melting point induced by annealing do not appear to significantly affect the subsequent dynamic mechanical properties. C1 TRI TESSCO,ORLANDO,FL 32806. RP STACK, GM (reprint author), NAVAL RES LAB,UNDERWATER SOUND REFERENCE DETACHMENT,TECH INFORMAT OFF,POB 568337,ORLANDO,FL 32856, USA. NR 17 TC 3 Z9 3 U1 0 U2 0 PU JOHN WILEY & SONS INC PI NEW YORK PA 605 THIRD AVE, NEW YORK, NY 10158-0012 SN 0021-8995 J9 J APPL POLYM SCI JI J. Appl. Polym. Sci. PD JAN 15 PY 1992 VL 44 IS 2 BP 305 EP 317 DI 10.1002/app.1992.070440215 PG 13 WC Polymer Science SC Polymer Science GA GV345 UT WOS:A1992GV34500015 ER PT J AU BERGSAGEL, PL VICTORKOBRIN, C TIMBLIN, CR TREPEL, J KUEHL, WM AF BERGSAGEL, PL VICTORKOBRIN, C TIMBLIN, CR TREPEL, J KUEHL, WM TI A MURINE CDNA ENCODES A PAN-EPITHELIAL GLYCOPROTEIN THAT IS ALSO EXPRESSED ON PLASMA-CELLS SO JOURNAL OF IMMUNOLOGY LA English DT Article ID HUMAN LYMPHOID-CELLS; MONOCLONAL-ANTIBODY; MOLECULAR-CLONING; PROTO-ONCOGENE; LUNG-CANCER; LINES; ANTIGEN; IDENTIFICATION; SEQUENCE; MYELOMA AB Using a subtractive cDNA approach, we have identified a number of genes expressed in murine plasmacytomas, but not B or pre-B lymphomas. One of these genes, 289A, expresses a 1.8-kb microsomally localized mRNA that encodes a 314-amino-acid protein containing a signal sequence and a hydrophobic transmembrane domain. Sequence comparison suggests that the predicted protein is the murine homologue of a human cell surface pan-epithelial glycoprotein known variously as EGP, GA733-2, KSA, and KS1/4, recognized by mAb HEA125, GA733, KS1/4,CO17-1A,M74, and 323/A3.The 289A mRNA is highly expressed in normal murine tissues containing epithelial cells, and at a low level in plasma cells induced by LPS stimulation of spleen B lymphocytes. It is expressed in 15 of 16 plasmacytomas, but at a much lower level, if at all, in pre-B or B lymphomas. In human B cell lines, 289A detects a 1.5-kb mRNA in the myeloma cell line 8226, but not in Burkitt's lymphoma or lymphoblastoid cell lines. Subsequent FACS analysis of human cell lines with the mAb GA733 and KS1/4 demonstrated concordant expression of the mRNA and the protein. We conclude that 289A is the murine homologue of EGP, GA733-2, KSA, and KS1/4 Ag. Although its expression was previously thought to be restricted to epithelial cells, it is also expressed in plasma cells and is a B lymphocyte differentiation Ag. Because of the multiplicity of names, we propose calling the human gene hEGP314, and the murine gene mEGP314. C1 USN,NCI,MED ONCOL BRANCH,BLDG 8,ROOM 5101,BETHESDA,MD 20889. NCI,MED BRANCH,BETHESDA,MD 20889. NR 43 TC 69 Z9 70 U1 0 U2 4 PU AMER ASSOC IMMUNOLOGISTS PI BETHESDA PA 9650 ROCKVILLE PIKE, BETHESDA, MD 20814 SN 0022-1767 J9 J IMMUNOL JI J. Immunol. PD JAN 15 PY 1992 VL 148 IS 2 BP 590 EP 596 PG 7 WC Immunology SC Immunology GA GZ965 UT WOS:A1992GZ96500040 PM 1729376 ER PT J AU FREITAS, JA KLEIN, PB BISHOP, SG AF FREITAS, JA KLEIN, PB BISHOP, SG TI OPTICAL STUDIES OF DONORS AND ACCEPTORS IN CUBIC SIC SO MATERIALS SCIENCE AND ENGINEERING B-SOLID STATE MATERIALS FOR ADVANCED TECHNOLOGY LA English DT Article ID CHEMICAL-VAPOR-DEPOSITION; SINGLE-CRYSTALS; TEMPERATURE-DEPENDENCE; ELECTRICAL-PROPERTIES; FILMS; GROWTH; PHOTOLUMINESCENCE AB Previous and recent results of continuous wave and pulsed photoluminescence (PL) studies of undoped and aluminum-doped 3C-SiC deposited on Si(100) substrates are reviewed. In undoped samples the band edge PL spectra are dominated by sharp lines assigned to excitions bound to neutral nitrogen donors, while deep PL emissions are associated predominantly with structural defects. In contrast, the PL spectra of aluminum-doped samples are dominated by recombination involving N-Al donor-acceptor pairs. The photoluminescence excitation spectra of undoped films are also discussed. C1 USN, RES LAB, WASHINGTON, DC 20375 USA. UNIV ILLINOIS, URBANA, IL 61801 USA. RP SACHS FREEMAN ASSOCIATES INC, LANDOVER, MD 20785 USA. NR 26 TC 7 Z9 7 U1 0 U2 3 PU ELSEVIER SCIENCE SA PI LAUSANNE PA PO BOX 564, 1001 LAUSANNE, SWITZERLAND SN 0921-5107 J9 MAT SCI ENG B-SOLID JI Mater. Sci. Eng. B-Solid State Mater. Adv. Technol. PD JAN 15 PY 1992 VL 11 IS 1-4 BP 21 EP 25 DI 10.1016/0921-5107(92)90182-9 PG 5 WC Materials Science, Multidisciplinary; Physics, Condensed Matter SC Materials Science; Physics GA HE067 UT WOS:A1992HE06700004 ER PT J AU TANG, X IRVINE, KG PING, Z SPENCER, MG MOLNAR, B AF TANG, X IRVINE, KG PING, Z SPENCER, MG MOLNAR, B TI MEASUREMENT OF ELECTROOPTICAL PROPERTIES OF BETA-SIC ON SAPPHIRE SUBSTRATES AND FREESTANDING FILMS SO MATERIALS SCIENCE AND ENGINEERING B-SOLID STATE MATERIALS FOR ADVANCED TECHNOLOGY LA English DT Article; Proceedings Paper CT SYMP AT THE 1990 FALL MEETING OF THE EUROPEAN MATERIALS RESEARCH SOC : PROPERTIES AND APPLICATIONS OF SIC, NATURAL AND SYNTHETIC DIAMOND AND RELATED MATERIALS CY NOV 27-30, 1990 CL STRASBOURG, FRANCE SP EUROPEAN MAT RES SOC, COUNCIL EUROPE, COMMISS EUROPEAN COMMUNITIES, USAF, OFF SCI RES, BANQUE POPULAIRE, CTR RECH NUCL, CNRS, NEWPORT, PALAIS CONGRES STRASBOURG, SERV DOCUMENTAT TOURIST, EUROPEAN PARLIMENT AB The growth of SiC on sapphire and measurements of the electronic and optical properties of these films are reported. SiC on sapphire is grown in a low pressure chemical vapor deposition reactor using the H-2, SiH4, C3H8 gas system. Growth is facilitated by the use of a thin silicon interlayer or is directly on the sapphire substrates. The growth of these materials and the optical characterization of free-standing films of SiC are reported. C1 USN,RES LABS,WASHINGTON,DC 20376. RP TANG, X (reprint author), HOWARD UNIV,SCH ENGN,DEPT ELECT ENGN,MAT SCI RES CTR EXCELLENCE,WASHINGTON,DC 20059, USA. NR 1 TC 5 Z9 6 U1 0 U2 0 PU ELSEVIER SCIENCE SA LAUSANNE PI LAUSANNE 1 PA PO BOX 564, 1001 LAUSANNE 1, SWITZERLAND SN 0921-5107 J9 MAT SCI ENG B-SOLID JI Mater. Sci. Eng. B-Solid State Mater. Adv. Technol. PD JAN 15 PY 1992 VL 11 IS 1-4 BP 39 EP 42 DI 10.1016/0921-5107(92)90186-D PG 4 WC Materials Science, Multidisciplinary; Physics, Condensed Matter SC Materials Science; Physics GA HE067 UT WOS:A1992HE06700008 ER PT J AU KELNER, G BINARI, S SHUR, M SLEGER, K PALMOUR, J KONG, H AF KELNER, G BINARI, S SHUR, M SLEGER, K PALMOUR, J KONG, H TI ALPHA-SIC BURIED-GATE JUNCTION FIELD-EFFECT TRANSISTORS SO MATERIALS SCIENCE AND ENGINEERING B-SOLID STATE MATERIALS FOR ADVANCED TECHNOLOGY LA English DT Article; Proceedings Paper CT SYMP AT THE 1990 FALL MEETING OF THE EUROPEAN MATERIALS RESEARCH SOC : PROPERTIES AND APPLICATIONS OF SIC, NATURAL AND SYNTHETIC DIAMOND AND RELATED MATERIALS CY NOV 27-30, 1990 CL STRASBOURG, FRANCE SP EUROPEAN MAT RES SOC, COUNCIL EUROPE, COMMISS EUROPEAN COMMUNITIES, USAF, OFF SCI RES, BANQUE POPULAIRE, CTR RECH NUCL, CNRS, NEWPORT, PALAIS CONGRES STRASBOURG, SERV DOCUMENTAT TOURIST, EUROPEAN PARLIMENT AB We report the results of an experimental study on alpha-SiC buried-gate junction field effect transistors operating in the temperature range from 24 to 400-degrees-C. The epitaxial structure used for fabrication of these devices employs a nitrogen-doped hexagonal alpha-SiC layer grown on a p-type aluminum-doped alpha-SiC film. Epitaxial layers were grown on the silicon face of unintentionally doped n-type alpha-SiC substrates. The current in the channel is modulated using the p-type layer as a gate. Fabricated devices with a 4-mu-m gate length have a maximum transconductance (g(m)) of 17 mS mm-1 and a drain saturation current (I(DSS)) of 450 mA mm-1 at room temperature. This value of the transconductance is the highest reported for devices of similar structure. Devices are completely pinched off at a gate voltage of -40 V. The device transconductance drops with increasing temperature owing to the decrease in electron mobility. The values of electron mobility at elevated temperatures derived from the measured transconductances and drain conductances are in agreement with independently measured Hall data. C1 UNIV VIRGINIA,CHARLOTTESVILLE,VA 22903. CREE RES INC,DURHAM,NC 27713. RP KELNER, G (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. RI Shur, Michael/A-4374-2016 OI Shur, Michael/0000-0003-0976-6232 NR 7 TC 11 Z9 11 U1 0 U2 0 PU ELSEVIER SCIENCE SA LAUSANNE PI LAUSANNE 1 PA PO BOX 564, 1001 LAUSANNE 1, SWITZERLAND SN 0921-5107 J9 MAT SCI ENG B-SOLID JI Mater. Sci. Eng. B-Solid State Mater. Adv. Technol. PD JAN 15 PY 1992 VL 11 IS 1-4 BP 121 EP 124 DI 10.1016/0921-5107(92)90203-L PG 4 WC Materials Science, Multidisciplinary; Physics, Condensed Matter SC Materials Science; Physics GA HE067 UT WOS:A1992HE06700025 ER PT J AU PAZIK, JC KELNER, G BOTTKA, N FREITAS, JA AF PAZIK, JC KELNER, G BOTTKA, N FREITAS, JA TI CHEMICAL VAPOR-DEPOSITION OF BETA-SIC ON SILICON-ON-SAPPHIRE AND SILICON-ON-INSULATOR SUBSTRATES SO MATERIALS SCIENCE AND ENGINEERING B-SOLID STATE MATERIALS FOR ADVANCED TECHNOLOGY LA English DT Article; Proceedings Paper CT SYMP AT THE 1990 FALL MEETING OF THE EUROPEAN MATERIALS RESEARCH SOC : PROPERTIES AND APPLICATIONS OF SIC, NATURAL AND SYNTHETIC DIAMOND AND RELATED MATERIALS CY NOV 27-30, 1990 CL STRASBOURG, FRANCE SP EUROPEAN MAT RES SOC, COUNCIL EUROPE, COMMISS EUROPEAN COMMUNITIES, USAF, OFF SCI RES, BANQUE POPULAIRE, CTR RECH NUCL, CNRS, NEWPORT, PALAIS CONGRES STRASBOURG, SERV DOCUMENTAT TOURIST, EUROPEAN PARLIMENT ID SEMICONDUCTOR TECHNOLOGY; HYDROGEN PEROXIDE; FILMS; GROWTH AB Cubic silicon carbide (beta-SiC) films have been grown epitaxially on silicon-on-sapphire (SOS) substrates by chemical vapor deposition. A fresh layer of silicon is first deposited in situ on the SOS substrate at approximately 1050-degrees-C. The silicon layer is then carbonized while being heated to 1360-degrees-C. The beta-SiC layer is grown at 1360-degrees-C using silane and propane as sources. Beta-SiC films can also be grown directly on the SOS substrate without utilizing a fresh silicon layer. Deposition of beta-SiC films on silicon-on-insulator (SOI) substrates has also been accomplished with slight modification of the growth parameters described above. The beta-SiC films have been characterized by IR reflectance spectroscopy, optical microscopy and electron microscopy. Typical films are 7-mu-m thick and have a specular surface with some physical features. Electrical transport properties as determined by the Van der Pauw Hall method show the beta-SiC films to be p-type while those grown on SOI were n-type. X-ray rocking curve measurements were obtained to determine the crystalline quality of the films. In addition, preliminary optical characterization of the films has been performed. C1 SACHS FREEMAN ASSOCIATES INC,LANDOVER,MD 20785. RP PAZIK, JC (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 12 TC 9 Z9 9 U1 0 U2 1 PU ELSEVIER SCIENCE SA LAUSANNE PI LAUSANNE 1 PA PO BOX 564, 1001 LAUSANNE 1, SWITZERLAND SN 0921-5107 J9 MAT SCI ENG B-SOLID JI Mater. Sci. Eng. B-Solid State Mater. Adv. Technol. PD JAN 15 PY 1992 VL 11 IS 1-4 BP 125 EP 129 DI 10.1016/0921-5107(92)90204-M PG 5 WC Materials Science, Multidisciplinary; Physics, Condensed Matter SC Materials Science; Physics GA HE067 UT WOS:A1992HE06700026 ER PT J AU MAGUIRE, HG DERRY, TE SELLSCHOP, JPF KARFUNKEL, U KAMO, M MORRISEN, IEG AF MAGUIRE, HG DERRY, TE SELLSCHOP, JPF KARFUNKEL, U KAMO, M MORRISEN, IEG TI ELECTRON AND NUCLEAR STRUCTURAL CHARACTERIZATION OF NATURAL, SYNTHETIC, HOMOEPITAXIAL AND POLYCRYSTALLINE LOW-PRESSURE CHEMICALLY VAPOR-DEPOSITED DIAMOND SO MATERIALS SCIENCE AND ENGINEERING B-SOLID STATE MATERIALS FOR ADVANCED TECHNOLOGY LA English DT Article; Proceedings Paper CT SYMP AT THE 1990 FALL MEETING OF THE EUROPEAN MATERIALS RESEARCH SOC : PROPERTIES AND APPLICATIONS OF SIC, NATURAL AND SYNTHETIC DIAMOND AND RELATED MATERIALS CY NOV 27-30, 1990 CL STRASBOURG, FRANCE SP EUROPEAN MAT RES SOC, COUNCIL EUROPE, COMMISS EUROPEAN COMMUNITIES, USAF, OFF SCI RES, BANQUE POPULAIRE, CTR RECH NUCL, CNRS, NEWPORT, PALAIS CONGRES STRASBOURG, SERV DOCUMENTAT TOURIST, EUROPEAN PARLIMENT AB Secondary-electron emission used to characterize the band structure of diamond is found to verify the electronic structure of <100> and <111> homoepitaxial and polycrystalline films grown by low pressure chemical vapour deposition (LPCVD) on various silicon substrates in agreement with that for natural diamond. Fe-57 Mossbauer spectroscopy of natural and synthetic diamonds reveals the presence of carbides, and the unique occurrence of superparamagnetism in these insulating matrices resulting from catalytic residues respectively. Rutherford backscattering, combined with ion channelling, determines the substrate interfacial and bulk integrity of the homoepitaxial films. All films exhibited a Raman signature of a single narrow line at 1332 cm-1 with no discernible graphitization or sp2 bonding. C1 NOTTINGHAM POLYTECH,DEPT ELECT & ELECTR ENGN,NOTTINGHAM,ENGLAND. NATL INST RES INORGAN MAT,SAKURA,IBARAKI 305,JAPAN. UNIV ESSEX,DEPT CHEM & BIOCHEM,COLCHESTER CO4 3SQ,ESSEX,ENGLAND. USN,RES LAB,WASHINGTON,DC 20375. RP MAGUIRE, HG (reprint author), UNIV WITWATERSRAND,SCHONLAND RES CTR NUCL SCI,PO WITS,JOHANNESBURG 2050,SOUTH AFRICA. NR 6 TC 4 Z9 4 U1 1 U2 2 PU ELSEVIER SCIENCE SA LAUSANNE PI LAUSANNE 1 PA PO BOX 564, 1001 LAUSANNE 1, SWITZERLAND SN 0921-5107 J9 MAT SCI ENG B-SOLID JI Mater. Sci. Eng. B-Solid State Mater. Adv. Technol. PD JAN 15 PY 1992 VL 11 IS 1-4 BP 243 EP 248 DI 10.1016/0921-5107(92)90219-Y PG 6 WC Materials Science, Multidisciplinary; Physics, Condensed Matter SC Materials Science; Physics GA HE067 UT WOS:A1992HE06700041 ER PT J AU PIESTRUP, MA BOYERS, DG PINCUS, CI LI, QA HALLEWELL, GD MORAN, MJ SKOPIK, DM SILZER, RM MARUYAMA, XK SNYDER, DD ROTHBART, GB AF PIESTRUP, MA BOYERS, DG PINCUS, CI LI, QA HALLEWELL, GD MORAN, MJ SKOPIK, DM SILZER, RM MARUYAMA, XK SNYDER, DD ROTHBART, GB TI OBSERVATION OF SOFT-X-RAY SPATIAL COHERENCE FROM RESONANCE TRANSITION RADIATION SO PHYSICAL REVIEW A LA English DT Article ID MEDIUM-ENERGY ELECTRONS; LASER AB We have observed the spatial distribution of coherent or resonance transition radiation (RTR) in the soft-x-ray region of the spectrum (1-3 keV). Resonance transition radiators were constructed and tested at two accelerators using electron-beam energies ranging from 50 to 228 MeV. These radiators emitted soft x rays in a circularly symmetrical annulus with a half-angle divergence of 2.5-9.0 mrad. The angle of peak emission was found to increase with electron-beam energy, in contrast to the incoherent case, for which the angle of emission varied inversely with electron-beam energy. By careful selection of foil thickness and spacing, one may design radiators whose angle of emission varies over a range of charged-particle energies. A particular RTR mode (r = m = 1) was found to give a sharp annular ring that becomes more accentuated as the number of foils is increased. The RTR effect has application in particle detection, beam diagnostics, x-ray source brightness enhancement, and x-ray free-electron-laser emission. C1 STANFORD UNIV,STANFORD LINEAR ACCELERATOR CTR,STANFORD,CA 94309. UNIV CALIF LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550. UNIV SASKATCHEWAN,SASKATCHEWAN ACCELERATOR LAB,SASKATOON S7N 0W0,SASKATCHEWAN,CANADA. USN,POSTGRAD SCH,MONTEREY,CA 93943. SOFTWARE SCI INC,BRISBANE,CA 94005. RP PIESTRUP, MA (reprint author), ADELPHI TECHNOL INC,285 HAMILTON AVE,SUITE 430,PALO ALTO,CA 94301, USA. NR 34 TC 34 Z9 34 U1 1 U2 2 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1050-2947 J9 PHYS REV A JI Phys. Rev. A PD JAN 15 PY 1992 VL 45 IS 2 BP 1183 EP 1196 DI 10.1103/PhysRevA.45.1183 PG 14 WC Optics; Physics, Atomic, Molecular & Chemical SC Optics; Physics GA HB019 UT WOS:A1992HB01900072 ER PT J AU MEYER, JR ARNOLD, DJ HOFFMAN, CA BARTOLI, FJ AF MEYER, JR ARNOLD, DJ HOFFMAN, CA BARTOLI, FJ TI FREE-CARRIER TRANSPORT IN SUPERLATTICES - SMOOTH TRANSITION BETWEEN THE QUASI 2-DIMENSIONAL AND UNIFORM 3-DIMENSIONAL LIMITS SO PHYSICAL REVIEW B LA English DT Article ID SEMICONDUCTOR SUPER-LATTICE; HGTE-CDTE SUPERLATTICES; PHONON-SCATTERING; ELECTRONIC-PROPERTIES; MOBILITY AB Presented here is a comprehensive, single-particle formalism for free-carrier transport in semiconductor superlattices with cylindrically symmetric energy dispersion. The spatial nonuniformity of the carrier population is accounted for by employing a scattering potential that is weighted by the wave-function distribution function. In the limit of large barrier-to-well thickness ratios, one regains the quasi-two-dimensional (2D) expressions derived previously. In the opposite limit of thin barriers and hence a nearly uniform wave-function distribution, transport in the superlattice becomes analogous to that in a 3D semiconductor with an anisotropic effective mass. Anisotropic relaxation times are obtained for acoustic-phonon, nonpolar-optical-phonon, polar-optical-phonon, and ionized-impurity scattering. Arbitrary energy dispersion relations are assumed, so that complex, numerically derived band structures may be straightforwardly incorporated. For the example of a HgTe-CdTe superlattice with weak hole dispersion but relatively strong electron dispersion in the growth direction, superlattice mobilities obtained using the present formalism are compared in detail with results for the quasi-2D and isotropic 3D limits. RP MEYER, JR (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 26 TC 14 Z9 14 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 JAN 15 PY 1992 VL 45 IS 3 BP 1295 EP 1304 DI 10.1103/PhysRevB.45.1295 PG 10 WC Physics, Condensed Matter SC Physics GA HA081 UT WOS:A1992HA08100028 ER PT J AU CHEN, JL WANG, CS JACKSON, KA PEDERSON, MR AF CHEN, JL WANG, CS JACKSON, KA PEDERSON, MR TI LOCALIZATION OF EXCESS ELECTRONS IN CUBIC NANCLM CLUSTERS SO PHYSICAL REVIEW B LA English DT Note ID ALKALI-HALIDE CLUSTERS AB Localization of excess electrons in sodium chloride clusters is studied using first-principles calculations based on the local-density approximation. In clusters with a rocksaltlike structure containing an anion vacancy, an excess electron was found to localize on an anion vacancy site, in analogy to the bulk F center, stabilizing the structure. Approximately the same degree of localization was found for surface, corner, and interior anion vacancies. For clusters without an anion vacancy, such as Na14Cl13, the excess electron is found to be delocalized over the cluster surface. In contrast to previous theoretical predictions, no tendency is found for the excess electron to localize at a sodium site, and localization-induced dissociation of a neutral alkali-metal atom is not expected to occur for an isolated cluster. C1 GEORGE MASON UNIV, DEPT PHYS, FAIRFAX, VA 22030 USA. USN, RES LAB, DIV CONDENSED MATTER & RADIAT SCI, COMPLEX SYST THEORY BRANCH, WASHINGTON, DC 20375 USA. RP UNIV MARYLAND, DEPT PHYS & ASTRON, COLLEGE PK, MD 20742 USA. OI Jackson, Koblar/0000-0002-5342-7978 NR 10 TC 6 Z9 6 U1 0 U2 0 PU AMER PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1098-0121 EI 1550-235X J9 PHYS REV B JI Phys. Rev. B PD JAN 15 PY 1992 VL 45 IS 4 BP 1927 EP 1930 DI 10.1103/PhysRevB.45.1927 PG 4 WC Physics, Condensed Matter SC Physics GA HB929 UT WOS:A1992HB92900051 ER PT J AU JUDGE, PG JORDAN, C FELDMAN, U AF JUDGE, PG JORDAN, C FELDMAN, U TI FE-II EMISSION-LINES .2. EXCITATION MECHANISMS IN COOL STARS SO ASTROPHYSICAL JOURNAL LA English DT Article DE ATOMIC PROCESSES; LINE, FORMATION; RADIATIVE TRANSFER; STARS, LATE-TYPE ID QUIET SUN; SOLAR CHROMOSPHERE; GIANT STARS; SPECTRUM; ATMOSPHERES; COMPONENTS; LIMB; IRON; IUE; PI AB We discuss excitation mechanisms for the "resonance" transitions (between the 3d(6)4s, 3d7, and 3d(6)4p configurations) of Fe II observed in emission in the near-ultraviolet spectra of cool stars. Our analysis is based upon (a) emission measure analysis of previously measured lines in IUE spectra of cool giants, (b) discussion of the behavior of Fe II lines observed above the solar limb from Skylab spectra, (c) approximate radiative transfer calculations in a 59 level Fe II model atom using mean escape probabilities and a parameterization of optical radiation fields, and (d) accurate radiative transfer calculations in a smaller atomic model. The solar spectra show unambiguous evidence that electron collisions are responsible for most of the Fe II emission observed above the white-light limb. For cool giants the z 6D0 z 6F0 terms, leading to UV multiplets 1, 32, and 2, 33, 60, are also excited primarily by electron collisions. However, the z 6P0, z 4D0 z 4F0 and z 4P0 terms, leading to UV multiplets, 3-6, 34-36, and 61-64, cannot be excited solely by electron collisions or by previously identified line fluorescence processes. These terms are excited by electron excitation of metastable quartet terms below approximately 4 eV, followed by photoexcitation in lines at optical wavelengths by photospheric radiation. We construct a "cool star" diagnostic diagram similar to the figure of Viotti, showing the regimes in which electron collisions and continuum photoexcitation are important in the chromospheres of cool stars. Finally, we discuss some implications of our findings. C1 UNIV COLORADO, NATL INST STAND & TECHNOL, JOINT INST LAB ASTROPHYS, BOULDER, CO 80302 USA. UNIV OXFORD, DEPT PHYS, OXFORD OX1 3NP, ENGLAND. USN, RES LAB, EO HULBURT CTR SPACE RES, WASHINGTON, DC 20375 USA. NR 55 TC 16 Z9 16 U1 0 U2 0 PU IOP PUBLISHING LTD PI BRISTOL PA TEMPLE CIRCUS, TEMPLE WAY, BRISTOL BS1 6BE, ENGLAND SN 0004-637X EI 1538-4357 J9 ASTROPHYS J JI Astrophys. J. PD JAN 10 PY 1992 VL 384 IS 2 BP 613 EP 623 DI 10.1086/170903 PN 1 PG 11 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA GY758 UT WOS:A1992GY75800023 ER PT J AU PAN, XP SHAO, M COLAVITA, MM ARMSTRONG, JT MOZURKEWICH, D VIVEKANAND, M DENISON, CS SIMON, RS JOHNSTON, KJ AF PAN, XP SHAO, M COLAVITA, MM ARMSTRONG, JT MOZURKEWICH, D VIVEKANAND, M DENISON, CS SIMON, RS JOHNSTON, KJ TI DETERMINATION OF THE VISUAL ORBIT OF THE SPECTROSCOPIC BINARY ALPHA ANDROMEDAE WITH SUBMILLIARCSECOND PRECISION SO ASTROPHYSICAL JOURNAL LA English DT Article DE BINARIES, VISUAL; INSTRUMENTATION, INTERFEROMETERS; STARS, INDIVIDUAL (ALPHA-ANDROMEDAE) ID III STELLAR INTERFEROMETER; OPTICAL ASTROMETRY; AP STARS AB The visual orbit of the spectroscopic binary alpha-And has been determined independently of spectroscopic data using the Mark III Stellar Interferometer. Observations of alpha-And in 1988 and 1989 clearly demonstrate submilliarcsecond measurement precision at optical wavelengths. All of the orbital elements of alpha-And have been calculated utilizing observations from the Mark III Stellar Interferometer only and are in excellent agreement with the spectroscopic results. However, three of these elements, i.e., a'', i, and OMEGA, can only be obtained from interferometric data. Using both interferometric and spectroscopic observations, the definitive orbital elements are determined as follows: angular semimajor axis a'' = 0.02415'' +/- 0.00013'', inclination i = 105.66-degrees +/- 0.22-degrees, position angle of ascending node OMEGA = 104.16-degrees +/- 0.25-degrees, longitude of periastron-omega = 77.31-degrees +/-0.32-degrees, period P = 96.6960d +/- 0.0013d, eccentricity e = 0.527 +/- 0.004, and epoch of periastron passage T = JD 2,447,374.77 +/- 0.15. In addition, the magnitude difference between the two components has been measured, yielding DELTA-m = 1.82 +/- 0.04 mag at 800 nm and DELTA-m = 1.99 +/- 0.04 mag at 550 nm. Incorporating photometric observations, the color indices between 550 nm and 800 nm for the primary and the companion are determined as -0.11 +/- 0.03 mag and +0.07 +/- 0.05 mag, respectively. C1 CALTECH,JET PROP LAB,OPT SCI & APPLICAT SECT,PASADENA,CA 91109. USN OBSERV,NAVAL RES LAB,OPT INTERFEROMETER PROJECT,WASHINGTON,DC 20392. RP PAN, XP (reprint author), CALTECH,DEPT ASTRON,PASADENA,CA 91125, USA. NR 38 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 JAN 10 PY 1992 VL 384 IS 2 BP 624 EP 633 DI 10.1086/170904 PN 1 PG 10 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA GY758 UT WOS:A1992GY75800024 ER PT J AU FLIEGEL, HF GALLINI, TE SWIFT, ER AF FLIEGEL, HF GALLINI, TE SWIFT, ER TI GLOBAL POSITIONING SYSTEM RADIATION FORCE MODEL FOR GEODETIC APPLICATIONS SO JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH LA English DT Article AB To generate the highly precise ephemerides of Global Positioning System (GPS) satellites necessary for modern geodetic applications, one must have an accurate force model that includes the pressure of solar radiation and spacecraft thermal emission. We present the dimensions and optical parameters of Block I and Block II GPS satellites, show how they are used to form the models of the solar force, and compare predictions of these models with values estimated from tracking data. Simple approximating functions are given for the solar/thermal radiation pressure, and the problem of estimating a smaller, unmodeled force called Y bias is discussed. A simple model is given for the effect of earthshine on GPS spacecraft. Two kinds of discrepancy are noted between model predictions and actual performance. For Block II satellites, beginning soon after launch, a transient force decaying exponentially with time, perhaps due to outgassing, aliases into estimates of the solar force. Also, at the beginning of eclipse season and for at least some satellites, Y bias estimates vary rapidly for reasons not presently understood. Therefore the geodetic worker should not only use the best available force models but also should avoid using a satellite in those critical time periods when unexplained model errors are present. C1 USN,CTR SURFACE WARFARE,DAHLGREN,VA 22448. RP FLIEGEL, HF (reprint author), AEROSPACE CORP,POB 92957,LOS ANGELES,CA 90009, USA. NR 12 TC 79 Z9 86 U1 1 U2 9 PU AMER GEOPHYSICAL UNION PI WASHINGTON PA 2000 FLORIDA AVE NW, WASHINGTON, DC 20009 SN 0148-0227 J9 J GEOPHYS RES-SOL EA JI J. Geophys. Res.-Solid Earth PD JAN 10 PY 1992 VL 97 IS B1 BP 559 EP 568 DI 10.1029/91JB02564 PG 10 WC Geochemistry & Geophysics SC Geochemistry & Geophysics GA GY778 UT WOS:A1992GY77800019 ER PT J AU KAXIRAS, E BROUGHTON, J AF KAXIRAS, E BROUGHTON, J TI ENERGETICS OF ORDERED STRUCTURES IN MOLECULAR-HYDROGEN SO EUROPHYSICS LETTERS LA English DT Article ID X-RAY-DIFFRACTION; SOLID HYDROGEN; MEGABAR PRESSURES; PHASE-TRANSITIONS; METALLIC HYDROGEN AB The energetics of ordered structures in molecular solid hydrogen under high pressure are studied through first-principles calculations. It is found that structures with the molecular axes lying close to the (a, b)-plane of a hexagonal close-packed lattice have in general lower energy and wider band gaps. Coherent rotation of tilted molecules around the c-axis is shown to be almost free. A new lowest-energy geometry is identified in which molecules in alternate planes are antiparallel. Possible superstructure arrangements are discussed. C1 USN, RES LAB, WASHINGTON, DC 20375 USA. NR 22 TC 28 Z9 28 U1 0 U2 4 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 0295-5075 J9 EUROPHYS LETT JI Europhys. Lett. PD JAN 7 PY 1992 VL 17 IS 2 BP 151 EP 155 DI 10.1209/0295-5075/17/2/012 PG 5 WC Physics, Multidisciplinary SC Physics GA GT400 UT WOS:A1992GT40000012 ER EF