FN Thomson Reuters Web of Science™ VR 1.0 PT B AU CHEN, VC AF CHEN, VC BE Szu, HH TI RADAR AMBIGUITY FUNCTION, TIME-VARYING MATCHED-FILTER, AND OPTIMUM WAVELET CORRELATOR SO WAVELET APPLICATIONS SE PROCEEDINGS OF THE SOCIETY OF PHOTO-OPTICAL INSTRUMENTATION ENGINEERS (SPIE) LA English DT Proceedings Paper CT Conference on Wavelet applications CY APR 05-08, 1994 CL ORLANDO, FL SP SOC PHOTO OPT INSTRUMENTAT ENGINEERS C1 USN,RES LAB,WASHINGTON,DC 20375. NR 0 TC 0 Z9 0 U1 0 U2 0 PU SPIE - INT SOC OPTICAL ENGINEERING PI BELLINGHAM PA PO BOX 10, BELLINGHAM, WA 98227-0010 BN 0-8194-1546-4 J9 P SOC PHOTO-OPT INS PY 1994 VL 2242 BP 337 EP 345 DI 10.1117/12.170037 PG 9 WC Optics; Physics, Mathematical SC Optics; Physics GA BA44Y UT WOS:A1994BA44Y00030 ER PT B AU HEWER, G KUO, W AF HEWER, G KUO, W BE Szu, HH TI WAVELET TRANSFORM OF FIXED PATTERN NOISE IN FOCAL-PLANE ARRAYS SO WAVELET APPLICATIONS SE PROCEEDINGS OF THE SOCIETY OF PHOTO-OPTICAL INSTRUMENTATION ENGINEERS (SPIE) LA English DT Proceedings Paper CT Conference on Wavelet applications CY APR 05-08, 1994 CL ORLANDO, FL SP SOC PHOTO OPT INSTRUMENTAT ENGINEERS C1 USN,CTR AIR WARFARE,DIV WEAPONS,CHINA LAKE,CA 93555. NR 0 TC 0 Z9 0 U1 0 U2 0 PU SPIE - INT SOC OPTICAL ENGINEERING PI BELLINGHAM PA PO BOX 10, BELLINGHAM, WA 98227-0010 BN 0-8194-1546-4 J9 P SOC PHOTO-OPT INS PY 1994 VL 2242 BP 538 EP 548 DI 10.1117/12.170055 PG 11 WC Optics; Physics, Mathematical SC Optics; Physics GA BA44Y UT WOS:A1994BA44Y00048 ER PT B AU KENNEY, C HEWER, G KUO, W AF KENNEY, C HEWER, G KUO, W BE Szu, HH TI A SURVEY OF OPTICAL-FLOW METHODS FOR TRACKING PROBLEMS SO WAVELET APPLICATIONS SE PROCEEDINGS OF THE SOCIETY OF PHOTO-OPTICAL INSTRUMENTATION ENGINEERS (SPIE) LA English DT Proceedings Paper CT Conference on Wavelet applications CY APR 05-08, 1994 CL ORLANDO, FL SP SOC PHOTO OPT INSTRUMENTAT ENGINEERS C1 USN,CTR AIR WARFARE,CHINA LAKE,CA 93555. NR 0 TC 0 Z9 0 U1 0 U2 0 PU SPIE - INT SOC OPTICAL ENGINEERING PI BELLINGHAM PA PO BOX 10, BELLINGHAM, WA 98227-0010 BN 0-8194-1546-4 J9 P SOC PHOTO-OPT INS PY 1994 VL 2242 BP 561 EP 572 DI 10.1117/12.170057 PG 12 WC Optics; Physics, Mathematical SC Optics; Physics GA BA44Y UT WOS:A1994BA44Y00050 ER PT B AU SZU, HH TELFER, BA AF SZU, HH TELFER, BA BE Szu, HH TI MATHEMATICAL THEOREMS OF ADAPTIVE WAVELET TRANSFORMS SO WAVELET APPLICATIONS SE PROCEEDINGS OF THE SOCIETY OF PHOTO-OPTICAL INSTRUMENTATION ENGINEERS (SPIE) LA English DT Proceedings Paper CT Conference on Wavelet applications CY APR 05-08, 1994 CL ORLANDO, FL SP SOC PHOTO OPT INSTRUMENTAT ENGINEERS C1 USN,CTR SURFACE WARFARE,DIV DAHLGREN,SILVER SPRING,MD 20903. NR 0 TC 1 Z9 1 U1 0 U2 0 PU SPIE - INT SOC OPTICAL ENGINEERING PI BELLINGHAM PA PO BOX 10, BELLINGHAM, WA 98227-0010 BN 0-8194-1546-4 J9 P SOC PHOTO-OPT INS PY 1994 VL 2242 BP 606 EP 636 DI 10.1117/12.170061 PG 31 WC Optics; Physics, Mathematical SC Optics; Physics GA BA44Y UT WOS:A1994BA44Y00054 ER PT B AU TELFER, BA SZU, HH DOBECK, GJ AF TELFER, BA SZU, HH DOBECK, GJ BE Szu, HH TI ADAPTIVE WAVELET CLASSIFICATION OF ACOUSTIC BACKSCATTER SO WAVELET APPLICATIONS SE PROCEEDINGS OF THE SOCIETY OF PHOTO-OPTICAL INSTRUMENTATION ENGINEERS (SPIE) LA English DT Proceedings Paper CT Conference on Wavelet applications CY APR 05-08, 1994 CL ORLANDO, FL SP SOC PHOTO OPT INSTRUMENTAT ENGINEERS C1 USN,CTR SURFACE WARFARE,DIV DAHLGREN,SILVER SPRING,MD 20903. NR 0 TC 3 Z9 3 U1 0 U2 0 PU SPIE - INT SOC OPTICAL ENGINEERING PI BELLINGHAM PA PO BOX 10, BELLINGHAM, WA 98227-0010 BN 0-8194-1546-4 J9 P SOC PHOTO-OPT INS PY 1994 VL 2242 BP 661 EP 668 DI 10.1117/12.170065 PG 8 WC Optics; Physics, Mathematical SC Optics; Physics GA BA44Y UT WOS:A1994BA44Y00057 ER PT B AU CARTER, PH AF CARTER, PH BE Szu, HH TI UNKNOWN TRANSIENT DETECTION USING WAVELETS SO WAVELET APPLICATIONS SE PROCEEDINGS OF THE SOCIETY OF PHOTO-OPTICAL INSTRUMENTATION ENGINEERS (SPIE) LA English DT Proceedings Paper CT Conference on Wavelet applications CY APR 05-08, 1994 CL ORLANDO, FL SP SOC PHOTO OPT INSTRUMENTAT ENGINEERS C1 USN,CTR SURFACE WARFARE,NONLINEAR DYNAM & WAVELETS GRP,SILVER SPRING,MD 20903. NR 0 TC 4 Z9 4 U1 0 U2 0 PU SPIE - INT SOC OPTICAL ENGINEERING PI BELLINGHAM PA PO BOX 10, BELLINGHAM, WA 98227-0010 BN 0-8194-1546-4 J9 P SOC PHOTO-OPT INS PY 1994 VL 2242 BP 803 EP 814 DI 10.1117/12.170078 PG 12 WC Optics; Physics, Mathematical SC Optics; Physics GA BA44Y UT WOS:A1994BA44Y00070 ER PT B AU GARCIA, J TELFER, B KO, H SZU, H AF GARCIA, J TELFER, B KO, H SZU, H BE Szu, HH TI COMPOSITE WAVELET FEATURES FOR IMAGE RECOGNITION SO WAVELET APPLICATIONS SE PROCEEDINGS OF THE SOCIETY OF PHOTO-OPTICAL INSTRUMENTATION ENGINEERS (SPIE) LA English DT Proceedings Paper CT Conference on Wavelet applications CY APR 05-08, 1994 CL ORLANDO, FL SP SOC PHOTO OPT INSTRUMENTAT ENGINEERS C1 USN,CTR SURFACE WARFARE,DIV DAHLGREN,SILVER SPRING,MD 20903. NR 0 TC 1 Z9 1 U1 0 U2 0 PU SPIE - INT SOC OPTICAL ENGINEERING PI BELLINGHAM PA PO BOX 10, BELLINGHAM, WA 98227-0010 BN 0-8194-1546-4 J9 P SOC PHOTO-OPT INS PY 1994 VL 2242 BP 936 EP 949 DI 10.1117/12.170094 PG 14 WC Optics; Physics, Mathematical SC Optics; Physics GA BA44Y UT WOS:A1994BA44Y00084 ER PT J AU LORENZ, KA WEISS, PJ AF LORENZ, KA WEISS, PJ TI CAPNOCYTOPHAGAL PNEUMONIA IN A HEALTHY MAN SO WESTERN JOURNAL OF MEDICINE LA English DT Letter C1 USN,MED CTR,DEPT CLIN INVEST,SAN DIEGO,CA 92134. RP LORENZ, KA (reprint author), USN,MED CTR,DEPT INTERNAL MED,SAN DIEGO,CA 92134, USA. NR 3 TC 12 Z9 12 U1 0 U2 0 PU CALIFORNIA PHYSICIAN MAGAZINE PI SAN FRANCISCO PA C/O DONNA TAYLOR, EDITOR, PO BOX 7690, SAN FRANCISCO, CA 94102-7690 SN 0093-0415 J9 WESTERN J MED JI West. J. Med. PD JAN PY 1994 VL 160 IS 1 BP 79 EP 80 PG 2 WC Medicine, General & Internal SC General & Internal Medicine GA MR694 UT WOS:A1994MR69400025 PM 8128719 ER PT B AU HARRIS, DC SCHMID, F MECHOLSKY, JJ TSAI, YL AF HARRIS, DC SCHMID, F MECHOLSKY, JJ TSAI, YL BE Klocek, P TI MECHANISM OF MECHANICAL FAILURE OF SAPPHIRE AT HIGH TEMPERATURE SO WINDOW AND DOME TECHNOLOGIES AND MATERIALS IV: DEDICATED TO THE MEMORY OF SOLOMON MUSIKANT SE PROCEEDINGS OF THE SOCIETY OF PHOTO-OPTICAL INSTRUMENTATION ENGINEERS (SPIE) LA English DT Proceedings Paper CT 4th International Conference on Infrared Windows and Domes, at the SPIE 1994 Annual Meeting CY JUL 26-28, 1994 CL SAN DIEGO, CA SP SOC PHOTO OPT INSTRUMENTAT ENGINEERS DE SAPPHIRE; MECHANICAL STRENGTH; FRACTURE; MECHANICAL FAILURE; TWINNING; INFRARED WINDOW; MIDWAVE INFRARED MATERIAL C1 USN,CTR AIR WARFARE,RES DEPT,DIV CHEM,CHINA LAKE,CA 93555. NR 0 TC 27 Z9 27 U1 0 U2 4 PU SPIE - INT SOC OPTICAL ENGINEERING PI BELLINGHAM PA PO BOX 10, BELLINGHAM, WA 98227-0010 BN 0-8194-1610-X J9 P SOC PHOTO-OPT INS PY 1994 VL 2286 BP 16 EP 25 DI 10.1117/12.187355 PG 10 WC Crystallography; Materials Science, Multidisciplinary; Materials Science, Coatings & Films; Optics SC Crystallography; Materials Science; Optics GA BB97D UT WOS:A1994BB97D00002 ER PT B AU WILSON, M THOMAS, M PEREZ, I PRICE, D AF WILSON, M THOMAS, M PEREZ, I PRICE, D BE Klocek, P TI IMPACT DAMAGE AS A FUNCTION OF CRYSTAL ORIENTATION IN GE IR WINDOWS EMPLOYING DURABLE PHOSPHIDE COATINGS SO WINDOW AND DOME TECHNOLOGIES AND MATERIALS IV: DEDICATED TO THE MEMORY OF SOLOMON MUSIKANT SE PROCEEDINGS OF THE SOCIETY OF PHOTO-OPTICAL INSTRUMENTATION ENGINEERS (SPIE) LA English DT Proceedings Paper CT 4th International Conference on Infrared Windows and Domes, at the SPIE 1994 Annual Meeting CY JUL 26-28, 1994 CL SAN DIEGO, CA SP SOC PHOTO OPT INSTRUMENTAT ENGINEERS DE FRACTURE; EROSION; GALLIUM PHOSPHIDE; GERMANIUM; MORPHOLOGY; CRYSTAL ORIENTATION C1 USN,CTR AIR WARFARE,DIV AIRCRAFT,DEPT MISS & AVION,WARMINSTER,PA 18974. NR 0 TC 6 Z9 6 U1 0 U2 0 PU SPIE - INT SOC OPTICAL ENGINEERING PI BELLINGHAM PA PO BOX 10, BELLINGHAM, WA 98227-0010 BN 0-8194-1610-X J9 P SOC PHOTO-OPT INS PY 1994 VL 2286 BP 108 EP 119 DI 10.1117/12.187333 PG 12 WC Crystallography; Materials Science, Multidisciplinary; Materials Science, Coatings & Films; Optics SC Crystallography; Materials Science; Optics GA BB97D UT WOS:A1994BB97D00010 ER PT B AU WILSON, M AF WILSON, M BE Klocek, P TI CORRELATION OF 0.67 mu M SCATTER WITH LOCAL STRESS IN GE IMPACTED WITH THE MODIFIED CAMBRIDGE LIQUID JET DEVICE SO WINDOW AND DOME TECHNOLOGIES AND MATERIALS IV: DEDICATED TO THE MEMORY OF SOLOMON MUSIKANT SE PROCEEDINGS OF THE SOCIETY OF PHOTO-OPTICAL INSTRUMENTATION ENGINEERS (SPIE) LA English DT Proceedings Paper CT 4th International Conference on Infrared Windows and Domes, at the SPIE 1994 Annual Meeting CY JUL 26-28, 1994 CL SAN DIEGO, CA SP SOC PHOTO OPT INSTRUMENTAT ENGINEERS DE GERMANIUM; BI-AXIAL FLEXURE; SCATTER; TENSION; BRDF; IMPACTED; SURFACE DAMAGE C1 USN,CTR AIR WARFARE,DIV AIRCRAFT,REMOTE SENSING CODE 5011,WARMINSTER,PA 18974. NR 0 TC 1 Z9 1 U1 0 U2 0 PU SPIE - INT SOC OPTICAL ENGINEERING PI BELLINGHAM PA PO BOX 10, BELLINGHAM, WA 98227-0010 BN 0-8194-1610-X J9 P SOC PHOTO-OPT INS PY 1994 VL 2286 BP 120 EP 131 DI 10.1117/12.187334 PG 12 WC Crystallography; Materials Science, Multidisciplinary; Materials Science, Coatings & Films; Optics SC Crystallography; Materials Science; Optics GA BB97D UT WOS:A1994BB97D00011 ER PT B AU MORAN, MB JOHNSON, LF KLEMM, KA AF MORAN, MB JOHNSON, LF KLEMM, KA BE Klocek, P TI METHOD FOR GROWTH OF CVD DIAMOND ON THIN FILM REFRACTORY COATINGS AND GLASS CERAMIC MATERIALS SO WINDOW AND DOME TECHNOLOGIES AND MATERIALS IV: DEDICATED TO THE MEMORY OF SOLOMON MUSIKANT SE PROCEEDINGS OF THE SOCIETY OF PHOTO-OPTICAL INSTRUMENTATION ENGINEERS (SPIE) LA English DT Proceedings Paper CT 4th International Conference on Infrared Windows and Domes, at the SPIE 1994 Annual Meeting CY JUL 26-28, 1994 CL SAN DIEGO, CA SP SOC PHOTO OPT INSTRUMENTAT ENGINEERS C1 USN,CTR AIR WARFARE,DIV WEAP,RES DEPT,DIV PHYS,CHINA LAKE,CA 93555. NR 0 TC 1 Z9 1 U1 0 U2 0 PU SPIE - INT SOC OPTICAL ENGINEERING PI BELLINGHAM PA PO BOX 10, BELLINGHAM, WA 98227-0010 BN 0-8194-1610-X J9 P SOC PHOTO-OPT INS PY 1994 VL 2286 BP 205 EP 216 DI 10.1117/12.187342 PG 12 WC Crystallography; Materials Science, Multidisciplinary; Materials Science, Coatings & Films; Optics SC Crystallography; Materials Science; Optics GA BB97D UT WOS:A1994BB97D00019 ER PT B AU HARRIS, DC AF HARRIS, DC BE Klocek, P TI PROPERTIES OF DIAMOND FOR WINDOW AND DOME APPLICATIONS SO WINDOW AND DOME TECHNOLOGIES AND MATERIALS IV: DEDICATED TO THE MEMORY OF SOLOMON MUSIKANT SE PROCEEDINGS OF THE SOCIETY OF PHOTO-OPTICAL INSTRUMENTATION ENGINEERS (SPIE) LA English DT Proceedings Paper CT 4th International Conference on Infrared Windows and Domes, at the SPIE 1994 Annual Meeting CY JUL 26-28, 1994 CL SAN DIEGO, CA SP SOC PHOTO OPT INSTRUMENTAT ENGINEERS DE DIAMOND; INFRARED WINDOW; DOME; OPTICAL PROPERTIES; EMISSIVITY; MECHANICAL STRENGTH; PHYSICAL PROPERTIES; THERMAL PROPERTIES C1 USN,CTR AIR WARFARE,DIV WEAP,RES DEPT,DIV CHEM,CHINA LAKE,CA 93555. NR 0 TC 25 Z9 25 U1 0 U2 2 PU SPIE - INT SOC OPTICAL ENGINEERING PI BELLINGHAM PA PO BOX 10, BELLINGHAM, WA 98227-0010 BN 0-8194-1610-X J9 P SOC PHOTO-OPT INS PY 1994 VL 2286 BP 218 EP 228 DI 10.1117/12.187343 PG 11 WC Crystallography; Materials Science, Multidisciplinary; Materials Science, Coatings & Films; Optics SC Crystallography; Materials Science; Optics GA BB97D UT WOS:A1994BB97D00020 ER PT B AU JOHNSON, CE BENNETT, JM NADLER, MP AF JOHNSON, CE BENNETT, JM NADLER, MP BE Klocek, P TI OXIDATIVE DEGRADATION OF CVD DIAMOND SO WINDOW AND DOME TECHNOLOGIES AND MATERIALS IV: DEDICATED TO THE MEMORY OF SOLOMON MUSIKANT SE PROCEEDINGS OF THE SOCIETY OF PHOTO-OPTICAL INSTRUMENTATION ENGINEERS (SPIE) LA English DT Proceedings Paper CT 4th International Conference on Infrared Windows and Domes, at the SPIE 1994 Annual Meeting CY JUL 26-28, 1994 CL SAN DIEGO, CA SP SOC PHOTO OPT INSTRUMENTAT ENGINEERS DE DIAMOND; OXIDATION; INFRARED TRANSMISSION; MICROSCOPY C1 USN,CTR AIR WARFARE,DIV WEAP,DIV CHEM,CHINA LAKE,CA 93555. NR 0 TC 0 Z9 0 U1 0 U2 0 PU SPIE - INT SOC OPTICAL ENGINEERING PI BELLINGHAM PA PO BOX 10, BELLINGHAM, WA 98227-0010 BN 0-8194-1610-X J9 P SOC PHOTO-OPT INS PY 1994 VL 2286 BP 247 EP 253 DI 10.1117/12.187346 PG 7 WC Crystallography; Materials Science, Multidisciplinary; Materials Science, Coatings & Films; Optics SC Crystallography; Materials Science; Optics GA BB97D UT WOS:A1994BB97D00023 ER PT B AU KLEMM, KA PATTERSON, HS JOHNSON, LF MORAN, MB AF KLEMM, KA PATTERSON, HS JOHNSON, LF MORAN, MB BE Klocek, P TI PROTECTIVE OPTICAL COATINGS FOR DIAMOND INFRARED WINDOWS SO WINDOW AND DOME TECHNOLOGIES AND MATERIALS IV: DEDICATED TO THE MEMORY OF SOLOMON MUSIKANT SE PROCEEDINGS OF THE SOCIETY OF PHOTO-OPTICAL INSTRUMENTATION ENGINEERS (SPIE) LA English DT Proceedings Paper CT 4th International Conference on Infrared Windows and Domes, at the SPIE 1994 Annual Meeting CY JUL 26-28, 1994 CL SAN DIEGO, CA SP SOC PHOTO OPT INSTRUMENTAT ENGINEERS DE DIAMOND OPTICS; PROTECTIVE COATINGS; OPTICAL COATINGS; HIGH TEMPERATURE TESTING C1 USN,CTR AIR WARFARE,DIV WEAP,CHINA LAKE,CA 93555. NR 0 TC 4 Z9 6 U1 0 U2 0 PU SPIE - INT SOC OPTICAL ENGINEERING PI BELLINGHAM PA PO BOX 10, BELLINGHAM, WA 98227-0010 BN 0-8194-1610-X J9 P SOC PHOTO-OPT INS PY 1994 VL 2286 BP 347 EP 353 DI 10.1117/12.187357 PG 7 WC Crystallography; Materials Science, Multidisciplinary; Materials Science, Coatings & Films; Optics SC Crystallography; Materials Science; Optics GA BB97D UT WOS:A1994BB97D00033 ER PT B AU BACHMANN, CM CLOTHIAUX, EE MOORE, JW ANDREANO, KJ LUONG, DQ AF BACHMANN, CM CLOTHIAUX, EE MOORE, JW ANDREANO, KJ LUONG, DQ GP INT NEURAL NETWORK SOC TI AN ENSEMBLE APPROACH TO AUTOMATIC MASKING OF CLOUDS IN AVIRIS IMAGERY USING BCM PROJECTION PURSUIT SO WORLD CONGRESS ON NEURAL NETWORKS-SAN DIEGO - 1994 INTERNATIONAL NEURAL NETWORK SOCIETY ANNUAL MEETING, VOL 1 LA English DT Proceedings Paper CT 1994 International-Neural-Network-Society Annual Meeting - World Congress on Neural Networks-San Diego CY JUN 05-09, 1994 CL SAN DIEGO, CA SP INT NEURAL NETWORK SOC C1 USN,RES LAB,DIV RADAR,AIRBORNE RADAR BRANCH,WASHINGTON,DC 20375. NR 0 TC 0 Z9 0 U1 0 U2 0 PU LAWRENCE ERLBAUM ASSOC PUBL PI MAHWAH PA 10 INDUSTRIAL AVE, MAHWAH, NJ 07430 BN 0-8058-1745-X PY 1994 BP A624 EP A630 PG 7 WC Computer Science, Artificial Intelligence; Engineering, Biomedical; Engineering, Chemical SC Computer Science; Engineering GA BB69D UT WOS:A1994BB69D00103 ER PT B AU CRAIGER, P AF CRAIGER, P GP INT NEURAL NETWORK SOC TI CAUSAL-STRUCTURE, MODEL INFERENCES, AND FUZZY COGNITIVE MAPS - HELP FOR THE BEHAVIORAL-SCIENTIST SO WORLD CONGRESS ON NEURAL NETWORKS-SAN DIEGO - 1994 INTERNATIONAL NEURAL NETWORK SOCIETY ANNUAL MEETING, VOL 1 LA English DT Proceedings Paper CT 1994 International-Neural-Network-Society Annual Meeting - World Congress on Neural Networks-San Diego CY JUN 05-09, 1994 CL SAN DIEGO, CA SP INT NEURAL NETWORK SOC C1 USN,CTR PERSONNEL RES & DEV,SAN DIEGO,CA 92132. NR 0 TC 0 Z9 0 U1 0 U2 0 PU LAWRENCE ERLBAUM ASSOC PUBL PI MAHWAH PA 10 INDUSTRIAL AVE, MAHWAH, NJ 07430 BN 0-8058-1745-X PY 1994 BP A836 EP A841 PG 6 WC Computer Science, Artificial Intelligence; Engineering, Biomedical; Engineering, Chemical SC Computer Science; Engineering GA BB69D UT WOS:A1994BB69D00138 ER PT B AU FALLON, MP GARCIA, RE TUMMALA, M AF FALLON, MP GARCIA, RE TUMMALA, M GP INT NEURAL NETWORK SOC TI NONLINEAR MISSILE CONTROLLER USING MEMORY NEURAL NETWORKS SO WORLD CONGRESS ON NEURAL NETWORKS-SAN DIEGO - 1994 INTERNATIONAL NEURAL NETWORK SOCIETY ANNUAL MEETING, VOL 2 LA English DT Proceedings Paper CT 1994 International-Neural-Network-Society Annual Meeting - World Congress on Neural Networks-San Diego CY JUN 05-09, 1994 CL SAN DIEGO, CA SP INT NEURAL NETWORK SOC C1 USN,POSTGRAD SCH,DEPT ELECT ENGN,MONTEREY,CA 93943. NR 0 TC 0 Z9 0 U1 0 U2 0 PU LAWRENCE ERLBAUM ASSOC PUBL PI MAHWAH PA 10 INDUSTRIAL AVE, MAHWAH, NJ 07430 BN 0-8058-1745-X PY 1994 BP B153 EP B158 PG 6 WC Automation & Control Systems; Computer Science, Artificial Intelligence; Mathematics, Applied; Neurosciences SC Automation & Control Systems; Computer Science; Mathematics; Neurosciences & Neurology GA BB69E UT WOS:A1994BB69E00026 ER PT B AU LEVINE, MD AF LEVINE, MD GP INT NEURAL NETWORK SOC TI CIRCUIT MODEL OF NEURONAL INHIBITION AND SUSTAINED EXCITATION SO WORLD CONGRESS ON NEURAL NETWORKS-SAN DIEGO - 1994 INTERNATIONAL NEURAL NETWORK SOCIETY ANNUAL MEETING, VOL 2 LA English DT Proceedings Paper CT 1994 International-Neural-Network-Society Annual Meeting - World Congress on Neural Networks-San Diego CY JUN 05-09, 1994 CL SAN DIEGO, CA SP INT NEURAL NETWORK SOC C1 USN,RES LAB,ONR ASEE POSTDOCTORAL FELLOWSHIP PROGRAM,WASHINGTON,DC 20375. NR 0 TC 0 Z9 0 U1 0 U2 0 PU LAWRENCE ERLBAUM ASSOC PUBL PI MAHWAH PA 10 INDUSTRIAL AVE, MAHWAH, NJ 07430 BN 0-8058-1745-X PY 1994 BP B688 EP B694 PG 7 WC Automation & Control Systems; Computer Science, Artificial Intelligence; Mathematics, Applied; Neurosciences SC Automation & Control Systems; Computer Science; Mathematics; Neurosciences & Neurology GA BB69E UT WOS:A1994BB69E00114 ER PT B AU RUBIN, MA AF RUBIN, MA GP INT NEURAL NETWORK SOC TI AUTOMATIC TARGET RECOGNITION FROM RADAR RANGE PROFILES USING FUZZY ARTMAP SO WORLD CONGRESS ON NEURAL NETWORKS-SAN DIEGO, - 1994 INTERNATIONAL NEURAL NETWORK SOCIETY ANNUAL MEETING, VOL 3 LA English DT Proceedings Paper CT 1994 International-Neural-Network-Society Annual Meeting - World Congress on Neural Networks-San Diego CY JUN 05-09, 1994 CL SAN DIEGO, CA SP INT NEURAL NETWORK SOC C1 USN,CTR AIR WARFARE,DIV PHYS,CHINA LAKE,CA 93555. NR 0 TC 0 Z9 0 U1 0 U2 0 PU LAWRENCE ERLBAUM ASSOC PUBL PI MAHWAH PA 10 INDUSTRIAL AVE, MAHWAH, NJ 07430 BN 0-8058-1745-X PY 1994 BP C291 EP C298 PG 8 WC Computer Science, Artificial Intelligence SC Computer Science GA BB69F UT WOS:A1994BB69F00045 ER PT B AU SZU, HH LU, F AF SZU, HH LU, F GP INT NEURAL NETWORK SOC TI A DOUBLE-WELL POTENTIAL-ENERGY FUNCTION RESOLVING BISTABLE AMBIGUITY FIGURES BY NEURAL NETWORKS SO WORLD CONGRESS ON NEURAL NETWORKS-SAN DIEGO, - 1994 INTERNATIONAL NEURAL NETWORK SOCIETY ANNUAL MEETING, VOL 3 LA English DT Proceedings Paper CT 1994 International-Neural-Network-Society Annual Meeting - World Congress on Neural Networks-San Diego CY JUN 05-09, 1994 CL SAN DIEGO, CA SP INT NEURAL NETWORK SOC DE REVERSIBLE FIGURES; BISTABLE; NEURAL NETWORKS; PHASE TRANSITION C1 USN,CTR SURFACE WARFARE,DAHLGREN DIV,SILVER SPRING,MD 20903. NR 0 TC 0 Z9 0 U1 0 U2 0 PU LAWRENCE ERLBAUM ASSOC PUBL PI MAHWAH PA 10 INDUSTRIAL AVE, MAHWAH, NJ 07430 BN 0-8058-1745-X PY 1994 BP C426 EP C431 PG 6 WC Computer Science, Artificial Intelligence SC Computer Science GA BB69F UT WOS:A1994BB69F00068 ER PT B AU TELFER, BA SZU, HH AF TELFER, BA SZU, HH GP INT NEURAL NETWORK SOC TI ADAPTIVE WAVELET NETWORKS FOR PATTERN-RECOGNITION SO WORLD CONGRESS ON NEURAL NETWORKS-SAN DIEGO, - 1994 INTERNATIONAL NEURAL NETWORK SOCIETY ANNUAL MEETING, VOL 3 LA English DT Proceedings Paper CT 1994 International-Neural-Network-Society Annual Meeting - World Congress on Neural Networks-San Diego CY JUN 05-09, 1994 CL SAN DIEGO, CA SP INT NEURAL NETWORK SOC C1 USN,CTR SURFACE WARFARE,DAHLGREN DIV,SILVER SPRING,MD 20903. NR 0 TC 0 Z9 0 U1 0 U2 0 PU LAWRENCE ERLBAUM ASSOC PUBL PI MAHWAH PA 10 INDUSTRIAL AVE, MAHWAH, NJ 07430 BN 0-8058-1745-X PY 1994 BP C103 EP C109 PG 7 WC Computer Science, Artificial Intelligence SC Computer Science GA BB69F UT WOS:A1994BB69F00015 ER PT B AU WALKER, TO TUMMALA, M VOIGT, R AF WALKER, TO TUMMALA, M VOIGT, R GP INT NEURAL NETWORK SOC TI AN ADAPTIVE RESONANCE THEORY (ART) NEURAL-NETWORK FOR SYNTHETIC-APERTURE RADAR TARGET RECOGNITION AND CLASSIFICATION SO WORLD CONGRESS ON NEURAL NETWORKS-SAN DIEGO, - 1994 INTERNATIONAL NEURAL NETWORK SOCIETY ANNUAL MEETING, VOL 3 LA English DT Proceedings Paper CT 1994 International-Neural-Network-Society Annual Meeting - World Congress on Neural Networks-San Diego CY JUN 05-09, 1994 CL SAN DIEGO, CA SP INT NEURAL NETWORK SOC C1 USN,POSTGRAD SCH,CODE EC TU,DEPT ELECT & COMP ENGN,MONTEREY,CA 93940. NR 0 TC 0 Z9 0 U1 0 U2 0 PU LAWRENCE ERLBAUM ASSOC PUBL PI MAHWAH PA 10 INDUSTRIAL AVE, MAHWAH, NJ 07430 BN 0-8058-1745-X PY 1994 BP C226 EP C231 PG 6 WC Computer Science, Artificial Intelligence SC Computer Science GA BB69F UT WOS:A1994BB69F00033 ER PT B AU KIM, MW AF KIM, MW GP INT NEURAL NETWORK SOC TI MULTIPLE TARGETS DISCRIMINATION USING NEURAL-NETWORK-BASED CLUSTERING ALGORITHMS SO WORLD CONGRESS ON NEURAL NETWORKS-SAN DIEGO - 1994 INTERNATIONAL NEURAL NETWORK SOCIETY ANNUAL MEETING, VOL 4 LA English DT Proceedings Paper CT 1994 International-Neural-Network-Society Annual Meeting - World Congress on Neural Networks-San Diego CY JUN 05-09, 1994 CL SAN DIEGO, CA SP INT NEURAL NETWORK SOC C1 USN,RES LAB,TEW DIV,WASHINGTON,DC 20375. NR 0 TC 0 Z9 0 U1 0 U2 0 PU LAWRENCE ERLBAUM ASSOC PUBL PI MAHWAH PA 10 INDUSTRIAL AVE, MAHWAH, NJ 07430 BN 0-8058-1745-X PY 1994 BP D45 EP D50 PG 6 WC Computer Science, Artificial Intelligence; Neurosciences SC Computer Science; Neurosciences & Neurology GA BB69G UT WOS:A1994BB69G00008 ER PT B AU SZU, HH MCFADDEN, FE AF SZU, HH MCFADDEN, FE GP INT NEURAL NETWORK SOC TI RECEPTIVE-FIELDS BY IMPLICIT PARTIAL DIFFERENTIATION - BIFURCATIONS IN A CAVLI MODEL SO WORLD CONGRESS ON NEURAL NETWORKS-SAN DIEGO - 1994 INTERNATIONAL NEURAL NETWORK SOCIETY ANNUAL MEETING, VOL 4 LA English DT Proceedings Paper CT 1994 International-Neural-Network-Society Annual Meeting - World Congress on Neural Networks-San Diego CY JUN 05-09, 1994 CL SAN DIEGO, CA SP INT NEURAL NETWORK SOC C1 USN,CTR SURFACE WARFARE,SILVER SPRING,MD 20903. NR 0 TC 0 Z9 0 U1 0 U2 0 PU LAWRENCE ERLBAUM ASSOC PUBL PI MAHWAH PA 10 INDUSTRIAL AVE, MAHWAH, NJ 07430 BN 0-8058-1745-X PY 1994 BP D332 EP D339 PG 8 WC Computer Science, Artificial Intelligence; Neurosciences SC Computer Science; Neurosciences & Neurology GA BB69G UT WOS:A1994BB69G00052 ER PT B AU SOCKER, DG BRUECKNER, GE KORENDYKE, CM SCHWENN, R AF SOCKER, DG BRUECKNER, GE KORENDYKE, CM SCHWENN, R BE Fineschi, S TI SPECTROMETRIC AND SPECTROPOLARIMETRIC OBSERVATION OF THE SOLAR CORONA WITH THE LASCO SOHO LYOT CORONAGRAPH SO X-RAY AND ULTRAVIOLET SPECTROSCOPY AND POLARIMETRY SE PROCEEDINGS OF THE SOCIETY OF PHOTO-OPTICAL INSTRUMENTATION ENGINEERS (SPIE) LA English DT Proceedings Paper CT Conference on X-ray and Ultraviolet Spectroscopy and Polarimetry CY JUL 28-29, 1994 CL SAN DIEGO, CA SP SOC PHOTO OPT INSTRUMENTAT ENGINEERS DE SPECTROSCOPIC LYOT CORONAGRAPH; TUNABLE FABRY-PEROT PASSBAND FILTER C1 USN,RES LAB,EO HULBURT CTR SPACE RES,WASHINGTON,DC 20375. NR 0 TC 0 Z9 0 U1 0 U2 0 PU SPIE - INT SOC OPTICAL ENGINEERING PI BELLINGHAM PA PO BOX 10, BELLINGHAM, WA 98227-0010 BN 0-8194-1607-X J9 P SOC PHOTO-OPT INS PY 1994 VL 2283 BP 53 EP 57 DI 10.1117/12.193195 PG 5 WC Astronomy & Astrophysics; Remote Sensing; Spectroscopy SC Astronomy & Astrophysics; Remote Sensing; Spectroscopy GA BB88L UT WOS:A1994BB88L00006 ER PT S AU DAVIS, J CLARK, RW GIULIANI, JL AF DAVIS, J CLARK, RW GIULIANI, JL BE Eder, DC Matthews, DL TI Ultrashort pulse laser produced plasmas SO X-RAY LASERS 1994 - FOURTH INTERNATIONAL COLLOQUIUM SE AIP CONFERENCE PROCEEDINGS LA English DT Proceedings Paper CT 4th International Colloquium on X-Ray Lasers CY MAY 15-20, 1994 CL WILLIAMSBURG, VA C1 USN,RES LAB,DIV PLASMA PHYS,WASHINGTON,DC 20375. NR 0 TC 0 Z9 0 U1 0 U2 1 PU AIP PRESS PI WOODBURY PA AMERICAN INSTITUTE OF PHYSICS 500 SUNNYSIDE BOULEVARD, WOODBURY, NY 11797-2999 SN 0094-243X BN 1-56396-375-2 J9 AIP CONF PROC PY 1994 IS 332 BP 126 EP 133 PG 8 WC Optics; Physics, Fluids & Plasmas; Physics, Atomic, Molecular & Chemical; Spectroscopy SC Optics; Physics; Spectroscopy GA BD37L UT WOS:A1994BD37L00020 ER PT S AU APRUZESE, JP AF APRUZESE, JP BE Eder, DC Matthews, DL TI X-ray laser research using Z pinches SO X-RAY LASERS 1994 - FOURTH INTERNATIONAL COLLOQUIUM SE AIP CONFERENCE PROCEEDINGS LA English DT Proceedings Paper CT 4th International Colloquium on X-Ray Lasers CY MAY 15-20, 1994 CL WILLIAMSBURG, VA C1 USN,RES LAB,DIV PLASMA PHYS,RADIAT HYDRODYNAM BRANCH,WASHINGTON,DC 20375. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AIP PRESS PI WOODBURY PA AMERICAN INSTITUTE OF PHYSICS 500 SUNNYSIDE BOULEVARD, WOODBURY, NY 11797-2999 SN 0094-243X BN 1-56396-375-2 J9 AIP CONF PROC PY 1994 IS 332 BP 399 EP 403 PG 5 WC Optics; Physics, Fluids & Plasmas; Physics, Atomic, Molecular & Chemical; Spectroscopy SC Optics; Physics; Spectroscopy GA BD37L UT WOS:A1994BD37L00067 ER PT S AU URBACH, HB GARMAN, RW WATTS, J DWAN, TE MITCHELL, EE HOWES, EC AF URBACH, HB GARMAN, RW WATTS, J DWAN, TE MITCHELL, EE HOWES, EC BE Olmos, J Sharon, A TI A STEAM-AUGMENTED GAS-TURBINE WITH REHEAT COMBUSTOR FOR SURFACE SHIPS SO XI ANNUAL SIMULATORS CONFERENCE: PROCEEDINGS OF 1994 SIMULATION MULTICONFERENCE SE SIMULATION SERIES LA English DT Proceedings Paper CT XI Annual Simulators Conference/1994 Simulation Multiconference CY APR 10-14, 1994 CL SAN DIEGO, CA SP SOC COMP SIMULAT C1 USN,CTR SURFACE WARFARE,CARDEROCK DIV,ANNAPOLIS,MD 21402. NR 0 TC 0 Z9 0 U1 0 U2 0 PU SOC COMPUTER SIMULATION INT PI SAN DIEGO PA PO BOX 17900, SAN DIEGO, CA 92177 SN 0735-9276 BN 1-56555-071-4 J9 SIMUL SERIES PY 1994 VL 26 IS 3 BP 475 EP 481 PG 7 WC Computer Science, Interdisciplinary Applications; Nuclear Science & Technology SC Computer Science; Nuclear Science & Technology GA BA76X UT WOS:A1994BA76X00077 ER PT J AU GATES, AA AF GATES, AA TI A PARAMETRIC STUDY ON ACHIEVING THE SAME FINAL SHAPE BY NUMERICAL EXPERIMENTATION USING A SHAPE OPTIMIZATION PROCESS SUBJECT TO DIFFERENT INITIAL CONDITIONS SO INTERNATIONAL JOURNAL FOR NUMERICAL METHODS IN ENGINEERING LA English DT Article AB A finite element based shape optimization program has been developed for three-dimensional shell structures which allows for multiple edge movement and large shape changes. This program automatically performs shape optimization by linking together adaptive mesh generation, substructuring and optimization algorithms with a commercial finite element analysis program, MSC/NASTRAN. This paper examines the robustness of the shape optimization program by varying the initial shape and design parameters for three examples. This is performed to determine the conditions under which similar optimum shapes will be generated for different initial conditions. RP GATES, AA (reprint author), USN,CTR UNDERSEA WARFARE,NEW LONDON,CT 06320, USA. NR 7 TC 1 Z9 1 U1 0 U2 0 PU JOHN WILEY & SONS LTD PI W SUSSEX PA BAFFINS LANE CHICHESTER, W SUSSEX, ENGLAND PO19 1UD SN 0029-5981 J9 INT J NUMER METH ENG JI Int. J. Numer. Methods Eng. PD DEC 30 PY 1993 VL 36 IS 24 BP 4127 EP 4150 DI 10.1002/nme.1620362403 PG 24 WC Engineering, Multidisciplinary; Mathematics, Interdisciplinary Applications SC Engineering; Mathematics GA MM705 UT WOS:A1993MM70500002 ER PT J AU GROSHENS, TJ HIGA, KT BUTCHER, RJ AF GROSHENS, TJ HIGA, KT BUTCHER, RJ TI SYNTHESIS AND CHARACTERIZATION OF COMPOUNDS WITH A GROUP 12-ARSENIC BOND - THE CRYSTAL-STRUCTURE OF [(T)BUZNAS((T)BU)(2)](2) SO JOURNAL OF ORGANOMETALLIC CHEMISTRY LA English DT Article AB The series of compounds [RMAs((t)Bu)(2)](n) (R = Me, (t)Bu; M = Zn, Cd, Hg), with an arsenic-Group 12 bond was investigated. Stability of the compounds was found to decrease Zn > Cd >> Hg, with [(t)BuCdAs((t)Bu)(2)](n) being unstable above 20 degrees C and no Hg compounds isolated. [MeZnAs((t)Bu)(2)](3), [(t)BuZnAs((t)Bu)(2)](2), and [MeCdAs((t)Bu)(2)](3) were isolated from the reaction of ((t)Bu)(2)AsLi with MeZnCl,(t)BuZnCl, and MeCdBr respectively, and were characterized by NMR and elemental analysis. Isopiestic molecular weight determination in benzene of [MeZnAs((t)Bu)(2)](3) was 739 (809 Calcd) and for [MeCdAs((t)Bu)(2)](3) was 847 (950 Calcd). The dimeric structure of [(t)BuZnAs((t)Bu2)(2)](2) was resolved by single-crystal X-ray diffraction. Crystal data: tetragonal, space group P4(2)/mnm, a = 9.451(1) Angstrom c = 18.131(2) Angstrom, z = 4, and R = 0.0493. C1 HOWARD UNIV,DEPT CHEM,WASHINGTON,DC 20059. RP GROSHENS, TJ (reprint author), USN,CTR AIR WARFARE,DIV WEAP,RES DEPT ,DIV CHEM,CHINA LAKE,CA 93555, USA. NR 17 TC 9 Z9 9 U1 0 U2 0 PU ELSEVIER SCIENCE SA LAUSANNE PI LAUSANNE 1 PA PO BOX 564, 1001 LAUSANNE 1, SWITZERLAND SN 0022-328X J9 J ORGANOMET CHEM JI J. Organomet. Chem. PD DEC 28 PY 1993 VL 463 IS 1-2 BP 97 EP 101 DI 10.1016/0022-328X(93)83404-J PG 5 WC Chemistry, Inorganic & Nuclear; Chemistry, Organic SC Chemistry GA MM749 UT WOS:A1993MM74900014 ER PT J AU KOWTHA, VC QUONG, JN BRYANT, HJ STENGER, DA AF KOWTHA, VC QUONG, JN BRYANT, HJ STENGER, DA TI COMPARATIVE ELECTROPHYSIOLOGICAL PROPERTIES OF NG108-15 CELLS IN SERUM-CONTAINING AND SERUM-FREE MEDIA SO NEUROSCIENCE LETTERS LA English DT Article DE NG108-15; SERUM-FREE MEDIUM; EXCITABILITY; CALCIUM CHANNEL ID GLIOMA HYBRID-CELLS; NEUROBLASTOMA; CHANNELS; LINE AB The electrophysiological properties of NG108-15 neuroblastoma x glioma hybrids were compared after culture in serum-containing medium (SCM) versus serum-free media (SFM) containing N2 or B27 supplements. The excitability of cells was media dependent (B27 > N2 > SCM). Action potential profiles of SFM cells were characterized by slower activation and prolonged after hyperpolarization which predisposed SFM cells to fire repetitively. The presence of three types of inward calcium currents was also revealed in SFM cells. These differential effects were primarily attributable to the media used with a secondary enhancement by the chemical differentiating agents used (dB-cAMP and forskolin). C1 USN,RES LAB,CTR BIOMOLEC SCI & ENGN,WASHINGTON,DC 20375. GEORGE WASHINGTON UNIV,DEPT BIOMED ENGN,WASHINGTON,DC 20052. UNIFORMED SERV UNIV HLTH SCI,DEPT PHYSIOL,BETHESDA,MD 20814. NR 13 TC 9 Z9 10 U1 0 U2 0 PU ELSEVIER SCI IRELAND LTD PI CLARE PA CUSTOMER RELATIONS MANAGER, BAY 15, SHANNON INDUSTRIAL ESTATE CO, CLARE, IRELAND SN 0304-3940 J9 NEUROSCI LETT JI Neurosci. Lett. PD DEC 24 PY 1993 VL 164 IS 1-2 BP 129 EP 133 DI 10.1016/0304-3940(93)90874-K PG 5 WC Neurosciences SC Neurosciences & Neurology GA MR374 UT WOS:A1993MR37400033 PM 8152587 ER PT J AU WEISS, PJ WALLACE, MR OLSON, PE ROSSETTI, R AF WEISS, PJ WALLACE, MR OLSON, PE ROSSETTI, R TI CHANGES IN THE MIX OF AIDS-DEFINING CONDITIONS SO NEW ENGLAND JOURNAL OF MEDICINE LA English DT Letter RP WEISS, PJ (reprint author), USN,MED CTR,SAN DIEGO,CA 92134, USA. NR 6 TC 20 Z9 20 U1 0 U2 0 PU MASS MEDICAL SOC PI BOSTON PA 10 SHATTUCK, BOSTON, MA 02115 SN 0028-4793 J9 NEW ENGL J MED JI N. Engl. J. Med. PD DEC 23 PY 1993 VL 329 IS 26 BP 1962 EP 1962 DI 10.1056/NEJM199312233292612 PG 1 WC Medicine, General & Internal SC General & Internal Medicine GA MM885 UT WOS:A1993MM88500012 PM 8247062 ER PT J AU COLLINS, GE ROSEPEHRSSON, SL AF COLLINS, GE ROSEPEHRSSON, SL TI SENSITIVE, FLUORESCENT DETECTION OF HYDRAZINE VIA DERIVATIZATION WITH 2,3-NAPHTHALENE DICARBOXALDEHYDE SO ANALYTICA CHIMICA ACTA LA English DT Article DE FLUOROMETRY; HYDRAZINE; NAPHTHALENE DICARBOXALDEHYDE ID ION AB The derivatization of hydrazine with 2,3-naphthalene dicarboxaldehyde (NDA) followed by fluorescence detection is shown to be an effective method for the selective determination of extremely low concentrations of hydrazine in solution. Kinetic studies of the reaction between hydrazine and NDA indicate that the reaction is first order in both hydrazine and NDA, and is dependent upon an acidic pH (optimum pH = 2.5) for the formation of the fluorescent derivative. The NDA-hydrazine derivative is readily formed (time response < 5 min) and is strongly fluorescent in the green (A(ex) = 403 nm and lambda(em) = 500 nm). A linear concentration dependence is observed over a dynamic range from 50 ng/l to 500 mu g/l of hydrazine (correlation coefficient, r > 0.999), with a signal-to-noise ratio of 3:1 for 50 ng/l of hydrazine. The selectivity of the NDA reagent is examined with respect to several possible interferents, including ammonia, and is shown to be a highly specific reagent for hydrazine. C1 USN,RES LAB,DIV CHEM,WASHINGTON,DC 20375. GEOCENTERS INC,FT WASHINGTON,MD 20744. NR 27 TC 44 Z9 44 U1 4 U2 11 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0003-2670 J9 ANAL CHIM ACTA JI Anal. Chim. Acta PD DEC 20 PY 1993 VL 284 IS 1 BP 207 EP 215 DI 10.1016/0003-2670(93)80026-H PG 9 WC Chemistry, Analytical SC Chemistry GA MR276 UT WOS:A1993MR27600026 ER PT J AU MAHON, R DUNCAN, MD TANKERSLEY, LL REINTJES, J AF MAHON, R DUNCAN, MD TANKERSLEY, LL REINTJES, J TI TIME-GATED IMAGING THROUGH DENSE SCATTERERS WITH A RAMAN AMPLIFIER SO APPLIED OPTICS LA English DT Article ID ELECTRONIC HOLOGRAPHY; AMPLIFICATION; MEDIA; PULSES AB A time-gated Raman amplifier has been used to detect a bar chart hidden by a strongly scattering material. The time gating was provided by a frequency-doubled Nd:YAG pump laser having a pulse duration of 30 ps. We have amplified and detected images with resolved structures smaller than 125 mu m through suspensions of polystyrene spheres and nondairy creamer for light extinction factors of up to e(33). The Raman amplifier system has been shown to produce images under conditions in which the scattering medium was sufficiently dense that an image could not be detected on either a streak camera or by integration on a sensitive, low-noise camera. C1 USN, RES LAB, DIV OPT SCI, LASER PHYS BRANCH, WASHINGTON, DC 20375 USA. USN ACAD, DEPT PHYS, ANNAPOLIS, MD 21402 USA. RP MAHON, R (reprint author), JAYCOR INC, 1608 SPRING HILL RD, VIENNA, VA 22180 USA. NR 17 TC 14 Z9 14 U1 0 U2 0 PU OPTICAL SOC AMER PI WASHINGTON PA 2010 MASSACHUSETTS AVE NW, WASHINGTON, DC 20036 USA SN 0003-6935 J9 APPL OPTICS JI Appl. Optics PD DEC 20 PY 1993 VL 32 IS 36 BP 7425 EP 7433 PG 9 WC Optics SC Optics GA MU150 UT WOS:A1993MU15000013 PM 20861960 ER PT J AU YANG, MJ WAGNER, RJ SHANABROOK, BV MOORE, WJ WATERMAN, JR YANG, CH FATEMI, M AF YANG, MJ WAGNER, RJ SHANABROOK, BV MOORE, WJ WATERMAN, JR YANG, CH FATEMI, M TI DEPENDENCE OF INAS PHONON ENERGY ON MISFIT-INDUCED STRAIN SO APPLIED PHYSICS LETTERS LA English DT Article ID RAMAN-SCATTERING; GAAS-ALAS; ALTERNATING MONOLAYERS; QUANTUM-WELLS; SUPERLATTICES; SEMICONDUCTORS; FREQUENCIES; GASB AB The transverse-optical (TO) phonon energy in strained InAs quantum wells has been investigated by using far-infrared absorption. We observe that the TO phonon energy decreases when the misfit-induced biaxial tension in the InAs single quantum well is increased. Our result shows a stronger phonon energy dependence on the strain than the one reported by Cerdeira et al. [Phys. Rev. B 5, 580 (1972)]. The discrepancy may be explained by stress relaxation near the surface in their experiment. The application of our result will be discussed. C1 UNIV MARYLAND,DEPT ELECT ENGN,COLL PK,MD 20742. RP YANG, MJ (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 22 TC 17 Z9 17 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 DEC 20 PY 1993 VL 63 IS 25 BP 3434 EP 3436 DI 10.1063/1.110137 PG 3 WC Physics, Applied SC Physics GA MM448 UT WOS:A1993MM44800013 ER PT J AU SNOW, ES CAMPBELL, PM SHANABROOK, BV AF SNOW, ES CAMPBELL, PM SHANABROOK, BV TI FABRICATION OF GAAS NANOSTRUCTURES WITH A SCANNING TUNNELING MICROSCOPE SO APPLIED PHYSICS LETTERS LA English DT Article ID SEMICONDUCTOR SURFACES; SILICON; NANOLITHOGRAPHY; AIR AB A method for fabricating GaAs nanostructures with a scanning tunneling microscope (STM) is presented. Utilizing a previously developed Si STM fabrication technique, the STM is used to pattern a thin (5 nm) epitaxial Si layer which is grown on GaAs. The patterned Si layer is used as a mask for wet etching the GaAs. This fabrication technique is quite general and should extend to other material systems provided a surface epitaxial Si layer can be grown. RP USN, RES LAB, WASHINGTON, DC 20375 USA. NR 12 TC 64 Z9 64 U1 0 U2 1 PU AMER INST PHYSICS PI MELVILLE PA 1305 WALT WHITMAN RD, STE 300, MELVILLE, NY 11747-4501 USA SN 0003-6951 EI 1077-3118 J9 APPL PHYS LETT JI Appl. Phys. Lett. PD DEC 20 PY 1993 VL 63 IS 25 BP 3488 EP 3490 DI 10.1063/1.110129 PG 3 WC Physics, Applied SC Physics GA MM448 UT WOS:A1993MM44800031 ER PT J AU MARCHYWKA, M PEHRSSON, PE VESTYCK, DJ MOSES, D AF MARCHYWKA, M PEHRSSON, PE VESTYCK, DJ MOSES, D TI LOW-ENERGY ION-IMPLANTATION AND ELECTROCHEMICAL SEPARATION OF DIAMOND FILMS SO APPLIED PHYSICS LETTERS LA English DT Article AB We combine low energy and low dose ion implantation with an electrochemical etch to fabricate thin diamond layers suitable for seeding homoepitaxial or polycrystalline chemical vapor deposited (CVD) diamond growth. Implantation of a carbon ion dose of 1 X 10(16) CM-2 at 175 keV creates subsurface damage in a bulk crystal which is selectively removed by the electrochemical etch. Implanted substrates were subjected to CVD diamond deposition prior to etching of the damage layer. We discuss the effect of implantation and subsequent annealing conditions on the morphology and Raman spectra of the CVD films. All results indicate that the seed layer nucleated high quality CVD diamond film growth. RP MARCHYWKA, M (reprint author), USN,RES LAB,4555 OVERLOOK AVE SW,WASHINGTON,DC 20375, USA. NR 5 TC 40 Z9 40 U1 1 U2 14 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 DEC 20 PY 1993 VL 63 IS 25 BP 3521 EP 3523 DI 10.1063/1.110089 PG 3 WC Physics, Applied SC Physics GA MM448 UT WOS:A1993MM44800042 ER PT J AU MARTINPINTADO, J GAUME, R BACHILLER, R JOHNSTON, K AF MARTINPINTADO, J GAUME, R BACHILLER, R JOHNSTON, K TI THE 150-AU STRUCTURE OF THE RADIO-CONTINUUM AND THE AMMONIA BIPOLAR OUTFLOW IN CRL-618 SO ASTROPHYSICAL JOURNAL LA English DT Article DE H-II REGIONS; ISM, INDIVIDUAL (CRL-618); ISM, JETS AND OUTFLOWS; ISM, KINEMATICS AND DYNAMICS; PLANETARY NEBULAE, GENERAL; RADIO CONTINUUM, INTERSTELLAR ID PROTO-PLANETARY NEBULAE; PROTOPLANETARY NEBULA; MOLECULAR OUTFLOW; OH 231.8+4.2; CRL-2688 AB We present high angular resolution (0.096'' x 0.066'') observations of the radio continuum emission at 23 GHz and of the (2, 2) line of NH3 toward the protoplanetary nebula CRL 618. The integrated flux density in the continuum indicates that the source has not experienced any systematic increase since 1980. The continuum emission is elongated in the east-west direction and shows an elliptical shell structure, reminiscent of an extremely young planetary nebula. While the southern part of the elliptical shell is rather uniform, the northern portion shows clumpy structure. The walls of the shell are unresolved by our 0.066'' beam. The continuum structure indicates that the H II region is not isothermal, but the electron temperature increases toward the edges. Ammonia is detected only in absorption toward the continuum source. The deepest absorption occurs at -50 km s-1, blueshifted with respect to the radial velocity of the approaching part of the expanding envelope (about -40 km s-1). The ammonia lines show a bipolar distribution with the blueshifted (radial velocities less than or similar to -45 km s-1) and redshifted (radial velocities greater than or similar to -45 km s-1) absorptions found toward the eastern and western parts of the H II region, respectively. The most blueshifted gas is found at the eastern edge of the continuum source, possibly indicating that acceleration of the high-velocity gas is taking place at scales of a few 100 AU. The optical depth of the absorption lines is not uniform, but increases from the center to the western and eastern edges of the H II region. The data indicate that the ammonia absorption does not arise in the slow expanding asymptotic giant branch (AGB) envelope, but from the high-velocity molecular outflow. The NH3 fractional abundance increases by more than three orders of magnitude from less than or similar to 8 x 10(-9) in the AGB envelope to at least 2 x 10(-5) in the molecular outflow. The chemistry of NH3 in protoplanetary nebulae is briefly discussed. C1 USN,RES LAB,DIV REMOTE SENSING,WASHINGTON,DC 20375. RP MARTINPINTADO, J (reprint author), CTR ASTRON YEBES IGN,APARTADO 148,E-18080 GUADALAJARA,SPAIN. RI Martin-Pintado, Jesus/H-6107-2015 OI Martin-Pintado, Jesus/0000-0003-4561-3508 NR 31 TC 24 Z9 24 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 DEC 20 PY 1993 VL 419 IS 2 BP 725 EP 732 DI 10.1086/173522 PN 1 PG 8 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA ML593 UT WOS:A1993ML59300027 ER PT J AU KASSIM, NE HERTZ, P WEILER, KW AF KASSIM, NE HERTZ, P WEILER, KW TI ROSAT OBSERVATIONS OF THE COMPOSITE SUPERNOVA REMNANT G326.3-1.8 SO ASTROPHYSICAL JOURNAL LA English DT Article DE ISM, INDIVIDUAL (SNR-G326.3-1.8); SUPERNOVA REMNANTS; X-RAYS, INTERSTELLAR ID X-RAY-EMISSION; ABSORPTION; DISTANCES; SPECTRUM; PLASMA AB We have observed X-ray emission from the radio-defined composite (shell plus filled-center plerion) Galactic supernova remnant (SNR) G326.3-1.8 with the ROSAT position sensitive proportional counter (PSPC). The data are best fitted by a single-component, thermal line spectrum with temperature kT = 0.56 +/- 0.04 keV, hydrogen column density N(H) = 8.9 +/- 0.3 x 10(21) cm-2, and unabsorbed X-ray flux F(x0) = 3.9 +/- 0.5 x 10(-10) ergs cm-2 s-1 (0.1-2.4 keV). The standard Sedov analysis with an assumed initial kinetic energy epsilon0 = 10(51) ergs gives a radius R congruent-to 20 pc, distance D congruent-to 3.7 kpc, age t congruent-to 1.0 x 10(4) yr, X-ray luminosity L(x) congruent-to 6.1 x 10(35) ergs s-1 (0.1-2.4 keV), and an ambient interstellar medium (ISM) density n0 congruent-to 0.1 CM-3. The derived distance falls within the range of a variety of previous but poor and uncertain distance estimates and is consistent with the only reliable lower limit of D greater-than-or-equal-to 1.5 kpc; Evidence exists in the literature from both optical and radio studies that would place the SNR significantly further than this lower limit. Higher quality radio H I absorption measurements are warranted to confirm our distance determination. Since D scales only weakly with co (D is-proportional-to epsilon(2/5)0), this result, along with other recent ROSAT studies of SNRs, implies that improved distance estimates may be established for the large number of extended shell-type SNRs with very poor distance estimates which fall within ROSAT's all-sky survey. No X-ray analog to the plerionic radio emission appears on our ROSAT image, but our exposure is not sufficient to establish a stringent limit on any filled-center nonthermal X-ray emission. An indistinguishable nonthermal component with spectral index -0.5 less-than-or-equal-to alpha less-than-or-equal-to -4 (S is-proportional-to v(+alpha)) could be present with a luminosity comparable to or exceeding that of the detected thermal component, particularly in light of the significant absorption that our results indicate must exist toward this distant source. A deeper X-ray exposure is required to set more meaningful limits on any plerionic X-ray emission. C1 USN,RES LAB,EO HULBURT CTR SPACE RES,WASHINGTON,DC 20375. RP KASSIM, NE (reprint author), USN,RES LAB,DIV REMOTE SENSING,WASHINGTON,DC 20375, USA. NR 42 TC 17 Z9 17 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 DEC 20 PY 1993 VL 419 IS 2 BP 733 EP 738 DI 10.1086/173523 PN 1 PG 6 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA ML593 UT WOS:A1993ML59300028 ER PT J AU IMAMURA, JN MIDDLEDITCH, J SCARGLE, JD STEIMANCAMERON, TY WHITLOCK, LA WOLFF, MT WOOD, KS AF IMAMURA, JN MIDDLEDITCH, J SCARGLE, JD STEIMANCAMERON, TY WHITLOCK, LA WOLFF, MT WOOD, KS TI THE QUASI-PERIODIC OSCILLATIONS OF VV PUPPIS SO ASTROPHYSICAL JOURNAL LA English DT Article DE BINARIES, CLOSE; NOVAE, CATACLYSMIC VARIABLES; STARS, INDIVIDUAL (VV PUPPIS); STARS, OSCILLATIONS; WHITE DWARFS ID DRIVEN RADIATIVE SHOCKS; MAGNETIC WHITE-DWARFS; TIME-SERIES ANALYSIS; AM HERCULIS OBJECTS AB Four AM Her objects are known to exhibit low-amplitude, rapid quasi-periodic oscillations (QPOs) in their optical emission. Here, we present high-speed optical photometric observations of the QPO source VV Pup obtained during 1990 January. The observations were made in unfiltered light. We first confirm the results of Larsson (1989) that VV Pup is a strong source of QPOs and that the QPOs are confined to optical maximum showing that the QPOs are produced in or near the X-ray-producing shock formed as the accreting plasma merges onto the white dwarf. We then show that: (1) variations in the amplitudes of the QPOs over narrow bandwidths, deltanu approximately 0.1 Hz, around the peak of the QPOs, nu(QPO) approximately 0.6-0.7 Hz, are correlated. We also find a suggestion that the QPO powers at widely separated frequencies are also positively correlated. These results suggest that the QPOs are due to a broad-band process rather than to a narrow-band feature which wanders slowly in frequency space. (2) We isolate strong damped oscillations in several 81.92 s intervals. The pulse profiles are consistent with damped sinusoids. The strongest feature has an amplitude of several percent with frequency v approximately 0.64 Hz and quality Q approximately 21, or a coherence Of tau approximately 6.7. VV Pup is the third QPO source to show evidence of strong oscillations of moderate coherence. C1 UNIV OREGON,INST THEORET SCI,EUGENE,OR 97403. LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545. USRA,GODDARD SPACE FLIGHT CTR,GREENBELT,MD 20771. UNIV CALIF SANTA CRUZ,LICK OBSERV,SANTA CRUZ,CA 95064. USN,RES LAB,WASHINGTON,DC 20375. RP IMAMURA, JN (reprint author), UNIV OREGON,DEPT PHYS,EUGENE,OR 97403, USA. NR 18 TC 6 Z9 6 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 DEC 20 PY 1993 VL 419 IS 2 BP 793 EP 802 DI 10.1086/173531 PN 1 PG 10 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA ML593 UT WOS:A1993ML59300036 ER PT J AU VANDYK, SD WEILER, KW SRAMEK, RA PANAGIA, N AF VANDYK, SD WEILER, KW SRAMEK, RA PANAGIA, N TI SN-1988Z - THE MOST DISTANT RADIO SUPERNOVA SO ASTROPHYSICAL JOURNAL LA English DT Article DE GALAXIES, INDIVIDUAL (MCG +03-28-022, ZW-095-049); RADIO CONTINUUM, STARS; SUPERNOVAE, INDIVIDUAL (SN-1988Z) ID X-RAY-EMISSION; LIGHT CURVES; NGC-891 AB We present observations of the early radio emission from the unusual supernova SN 1988Z in MCG +03-28-022 made with the Very Large Array at 20, 6, 3.6, and 2 cm from 1989 December, 1 year after optical discovery, through 1992 December. At the redshift z = 0.022 of the parent galaxy, SN 1988Z is the most distant radio supernova ever discovered. With a 6 cm maximum flux density of 1.90 mJy, SN 1988Z is approximately 1.2 times more luminous than the unusually powerful radio supernova SN 1986J in NGC 891, making SN 1988Z also one of the most luminous radio supernovae ever discovered. Our analysis and model fitting of these initial light curves indicates that the overall radio properties of SN 1988Z are quite similar to those of SN 1986J and can be described by a modified Chevalier model involving the supernova shock interacting with a high-density circumstellar cocoon, with an additional component of internal thermal absorbers and nonthermal emitters. The radio properties of SN 1988Z indicate that the cocoon resulted from a very high mass-loss rate (M approximately 10(-4) M., yr-1) in the late stages of the evolution of a very massive (20-30 M.) presupernova star. C1 NATL RADIO ASTRON OBSERV,SOCORRO,NM 87801. UNIV CATANIA,I-95124 CATANIA,ITALY. SPACE TELESCOPE SCI INST,BALTIMORE,MD 21218. RP VANDYK, SD (reprint author), USN,RES LAB,DIV REMOTE SENSING,CODE 7215,WASHINGTON,DC 20375, USA. OI Van Dyk, Schuyler/0000-0001-9038-9950 NR 26 TC 67 Z9 67 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 DEC 20 PY 1993 VL 419 IS 2 BP L69 EP L72 DI 10.1086/187139 PN 2 PG 4 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA ML594 UT WOS:A1993ML59400007 ER PT J AU GARLAND, NL MEDHURST, LJ NELSON, HH AF GARLAND, NL MEDHURST, LJ NELSON, HH TI POTENTIAL CHLOROFLUOROCARBON REPLACEMENTS - OH REACTION-RATE CONSTANTS BETWEEN 250 AND 315-K AND INFRARED-ABSORPTION SPECTRA SO JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES LA English DT Article ID ATMOSPHERIC FATE; CROSS-SECTIONS; RATE COEFFICIENTS; HYDROFLUOROETHANES; ETHERS AB We measured the rate constant for reactions of the OH radical with several potential chlorofluorocarbon replacements over the temperature range 251-314 K using laser photolysis laser-induced fluorescence techniques. The compounds studied and Arrhenius parameters determined from fits to the measured rate constants are as follows: CHF2OCHF2 (E 134), k(T) = (5.4 +/- 3.5) x 10(-13) cm3 s-1 exp [(-3.1 +/- 0.4 kcal mol-1)/RT]; CF3CH2CF3 (FC 236fa), k(T) = (2.0 +/- 1.0) X 10(-14) CM3 S-1 exp [(-1.8 +/- 0.3 kcal mol-1)/RT]; CF3CHFCH2F2 (FC 236ea), k(T) = (2.0 +/- 0.9) X 10(-13) CM3 S-1 exp [(-2.0 +/- 0.3 kcal mol-1)/RT]; and CF3CF2CH2F (FC 236cb), k(T) = (2.6 +/- 1.6) X 10(-13) cm3 S-1 exp [(-2.2 +/- 0.4 kcal mol-1)/RT]. The measured activation energies (2-3 kcal mol-1) are consistent with a mechanism of H atom abstraction. The tropospheric lifetimes, estimated from the measured OH reaction rates, and measured integrated infrared absorption cross sections over the range 770 to 1430 cm-1 suggest that E 134 and FC 236fa may have significant global warming potential. while FC 236ea and FC 236cb do not. RP GARLAND, NL (reprint author), USN, RES LAB, DIV CHEM, CODE 6111, WASHINGTON, DC 20375 USA. NR 17 TC 37 Z9 38 U1 0 U2 2 PU AMER GEOPHYSICAL UNION PI WASHINGTON PA 2000 FLORIDA AVE NW, WASHINGTON, DC 20009 USA SN 2169-897X J9 J GEOPHYS RES-ATMOS JI J. Geophys. Res.-Atmos. PD DEC 20 PY 1993 VL 98 IS D12 BP 23107 EP 23111 DI 10.1029/93JD02550 PG 5 WC Meteorology & Atmospheric Sciences SC Meteorology & Atmospheric Sciences GA MP295 UT WOS:A1993MP29500021 ER PT J AU WHELAN, JP KUSTERBECK, AW WEMHOFF, GA BREDEHORST, R LIGLER, FS AF WHELAN, JP KUSTERBECK, AW WEMHOFF, GA BREDEHORST, R LIGLER, FS TI CONTINUOUS-FLOW IMMUNOSENSOR FOR DETECTION OF EXPLOSIVES SO ANALYTICAL CHEMISTRY LA English DT Article ID ENZYME-IMMUNOASSAY; MOLECULE; LEVEL AB A continuous-flow immunosensor for detection of trinitrotoluene (TNT) in aqueous solution is described. The sensor utilizes an immobilized monoclonal antibody specific for TNT and saturated with fluorescein-labeled antigen. When introduced into the flow stream through the column, samples containing unlabeled antigen displace the bound labeled antigen. The displaced labeled antigen is detected downstream using a fluorometer. The displacement of labeled antigen is directly proportional to the concentration of unlabeled antigen applied to the column over a range of 20 to 1200 ng/mL (ppb). The sensitivity is increased when solvents (ethanol or 2-propanol) are included in the flow buffer at concentrations up to 25% (v/v). By use of a cyclone air sampler and a TNT vapor generator, TNT could be detected in collected samples. The flow immunosensor provides the means to detect trace levels of TNT with high specificity in times of less than 1 min. Such qualities make the flow immunosensor a promising low-cost alternative to explosive detection devices currently available to transportation and security industries. C1 USN,RES LAB,CTR BIOMOLEC SCI & ENGN,CODE 6900,WASHINGTON,DC 20375. NR 16 TC 104 Z9 106 U1 0 U2 6 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0003-2700 J9 ANAL CHEM JI Anal. Chem. PD DEC 15 PY 1993 VL 65 IS 24 BP 3561 EP 3565 DI 10.1021/ac00072a005 PG 5 WC Chemistry, Analytical SC Chemistry GA MM264 UT WOS:A1993MM26400005 ER PT J AU REEVE, SW WEIMER, WA CERIO, FM AF REEVE, SW WEIMER, WA CERIO, FM TI GAS-PHASE CHEMISTRY IN A DIRECT-CURRENT PLASMA-JET DIAMOND REACTOR SO JOURNAL OF APPLIED PHYSICS LA English DT Article ID CHEMICAL VAPOR-DEPOSITION; GROWTH; CVD; FILM; PRESSURE; METHYL AB Reaction products contained in the exhaust gas of a dc plasma jet reactor system were detected using mass spectrometry. The major reaction products formed from a feed gas mixture of 96% H-2, 3% CH4, and 1% O2 injected into an argon plasma jet were CH4, C2H2, C2H6, CO, and H2O. The products formed Without O2 in the reactor feed were CH4, C2H2, and C2H6. Addition of O2 to the reactor gas feed increased the diamond deposition rate by approximately 30% with no degradation in quality. A chemical kinetics model for flames was adapted to this reactor and accurately predicted the major reaction products formed for a reactor feed without O2, indicating the gas phase chemistry may be described by a reaction set developed for hydrocarbon combustion and the chemistry is thermally driven. When compared to experimental results, the model predicts: (1) a maximum temperature in the gas of 3000 K, (2) only 1.2% of the H-2 in the reactor feed is dissociated, and (3) CH3 is the primary diamond growth precursor. RP REEVE, SW (reprint author), USN, CTR AIR WARFARE, DIV WEAPONS, RES DEPT, DIV CHEM, CHINA LAKE, CA 93555 USA. NR 52 TC 15 Z9 15 U1 1 U2 5 PU AMER INST PHYSICS PI MELVILLE PA CIRCULATION & FULFILLMENT DIV, 2 HUNTINGTON QUADRANGLE, STE 1 N O 1, MELVILLE, NY 11747-4501 USA SN 0021-8979 J9 J APPL PHYS JI J. Appl. Phys. PD DEC 15 PY 1993 VL 74 IS 12 BP 7521 EP 7530 DI 10.1063/1.354978 PG 10 WC Physics, Applied SC Physics GA ML900 UT WOS:A1993ML90000070 ER PT J AU SNAIL, KA VARDIMAN, RG ESTRERA, JP GLESENER, JW MERZBACHER, C CRAIGIE, CJ MARKS, CM GLOSSER, R FREITAS, JA AF SNAIL, KA VARDIMAN, RG ESTRERA, JP GLESENER, JW MERZBACHER, C CRAIGIE, CJ MARKS, CM GLOSSER, R FREITAS, JA TI DIAMOND GROWTH IN TURBULENT OXYGEN-ACETYLENE FLAMES SO JOURNAL OF APPLIED PHYSICS LA English DT Article ID CHEMICAL VAPOR-DEPOSITION; SINGLE-CRYSTAL DIAMOND; HIGH-QUALITY DIAMOND; COMBUSTION FLAMES; HIGH-TEMPERATURE; FILMS; SURFACES; METHYL AB Turbulent premixed oxygen-acetylene flames have been used to synthesize polycrystalline diamond films on molybdenum substrates at temperatures ranging from 500 to 1300-degrees-C and facetted single crystals on mm-sized natural diamond substrates at temperatures of 1200-1300-degrees-C. Turbulence was achieved by increasing the torch's orifice diameter and/or the flow velocity; the presence of turbulence was confirmed by observations of changes in the flame shape, measurements of the flame's noise spectrum, and calculations of the Reynolds number. The optical emission spectra of several diamond-growing turbulent flames were also compared to the spectra of laminar flames. The variation in diamond quality with temperature and oxygen acetylene flow ratio was studied with one or more of the following techniques: Raman spectroscopy, scanning and transmission electron microscopy, infrared spectroscopy, and photoluminescence spectroscopy. Crystals grown on molybdenum at temperatures of 600-1100-degrees-C were observed to be transparent, and under the proper conditions the quality of diamond grown epitaxially in a turbulent flame equals that of natural type-IIa diamond. Although this enhanced quality has only been observed for fairly lean flames, the growth rate for type-IIa quality diamonds can still exceed 35 mum/h. C1 USN,RES LAB,DIV MAT SCI & TECHNOL,WASHINGTON,DC 20375. UNIV TEXAS,PHYS PROGRAMS,RICHARDSON,TX 75083. UNIV ARIZONA,CTR OPT SCI,TUCSON,AZ 85721. SACHS FREEMAN & ASSOCIATES,LANDOVER,MD 20785. RP SNAIL, KA (reprint author), USN,RES LAB,DIV OPT SCI,CODE 5622,WASHINGTON,DC 20375, USA. NR 42 TC 25 Z9 25 U1 0 U2 1 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0021-8979 J9 J APPL PHYS JI J. Appl. Phys. PD DEC 15 PY 1993 VL 74 IS 12 BP 7561 EP 7571 DI 10.1063/1.354982 PG 11 WC Physics, Applied SC Physics GA ML900 UT WOS:A1993ML90000074 ER PT J AU HUNTER, WR SEELY, JF AF HUNTER, WR SEELY, JF TI BLAZE CONSIDERATIONS FOR MULTILAYER GRATINGS - SOME COMMENTS SO OPTICS COMMUNICATIONS LA English DT Article AB The constant blaze angle that is an attribute of blazed, ruled, concave diffraction gratings gives rise to a passband encompassing a range of wavelengths that depends on the grating parameters. Adding a multilayer coating designed for a wavelength within the passband restricts the passband approximately to that wavelength plus or minus the width of the multilayer rocking curve, which can be much smaller than the passband of the uncoated grating. C1 USN,RES LAB,EO HULBURT CTR SPACE RES,WASHINGTON,DC 20375. RP HUNTER, WR (reprint author), SFA INC,1401 MCCORMICK DR,LANDOVER,MD 20785, USA. NR 4 TC 0 Z9 0 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0030-4018 J9 OPT COMMUN JI Opt. Commun. PD DEC 15 PY 1993 VL 104 IS 1-3 BP 139 EP 140 DI 10.1016/0030-4018(93)90121-K PG 2 WC Optics SC Optics GA MQ175 UT WOS:A1993MQ17500028 ER PT J AU BASHKANSKY, M REINTJES, J AF BASHKANSKY, M REINTJES, J TI IMAGING THROUGH A STRONG SCATTERING MEDIUM WITH NONLINEAR-OPTICAL FIELD CROSS-CORRELATION TECHNIQUES SO OPTICS LETTERS LA English DT Article ID GAIN ENHANCEMENT; RAMAN AMPLIFIER AB We demonstrate a new technique for imaging an object obscured by a scattering medium. A class of nonlinear optical field cross-correlation processes is discussed and shown to be capable of reproducing an image of the hidden object. The spatial resolution can be easily controlled by adjustment of the laser bandwidth. The process of coherent anti-Stokes Raman scattering was employed in this research to produce an image of a wire hidden behind a suspension of nondairy creamer. RP USN, RES LAB, DIV OPT SCI, LASER PHYS BRANCH, CODE 5640, WASHINGTON, DC 20375 USA. NR 26 TC 11 Z9 11 U1 0 U2 1 PU OPTICAL SOC AMER PI WASHINGTON PA 2010 MASSACHUSETTS AVE NW, WASHINGTON, DC 20036 USA SN 0146-9592 EI 1539-4794 J9 OPT LETT JI Opt. Lett. PD DEC 15 PY 1993 VL 18 IS 24 BP 2132 EP 2134 DI 10.1364/OL.18.002132 PG 3 WC Optics SC Optics GA MP684 UT WOS:A1993MP68400016 PM 19829512 ER PT J AU TROMBETTA, JM KENNEDY, TA AF TROMBETTA, JM KENNEDY, TA TI OPTICALLY DETECTED MAGNETIC-RESONANCE OF SHALLOW DONORS IN GAAS SO PHYSICAL REVIEW B LA English DT Article ID ACCEPTOR PAIRS AB The observation, via optically detected magnetic resonance, of shallow donors in GaAs is reported. A resonance having Absolute value of g = 0.43 +/- 0.01 was observed as a change in the long-wavelength photoluminescence from samples doped with approximately 10(16) cm-3 Te and approximately 4 X 10(16) cm-3 Cr. The large resonance linewidth of 930 mT is attributed to exchange interactions with randomly distributed recombination partners. C1 USN,RES LAB,WASHINGTON,DC 20375. NR 15 TC 5 Z9 5 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1098-0121 J9 PHYS REV B JI Phys. Rev. B PD DEC 15 PY 1993 VL 48 IS 23 BP 17031 EP 17034 DI 10.1103/PhysRevB.48.17031 PG 4 WC Physics, Condensed Matter SC Physics GA MN530 UT WOS:A1993MN53000016 ER PT J AU SHANABROOK, BV BENNETT, BR WAGNER, RJ AF SHANABROOK, BV BENNETT, BR WAGNER, RJ TI PLANAR VIBRATIONAL-MODES IN SUPERLATTICES SO PHYSICAL REVIEW B LA English DT Article ID INAS/GASB SUPERLATTICES; GA1-XINXSB/INAS SUPERLATTICES; INTERFACE PHONONS; RAMAN-SCATTERING AB Vibrational Raman scattering and x-ray diffraction have been performed on GaSb/InAs superlattices. The composition of the AsxSb1-x plane that connects the InAs and GaSb layers has been varied by controlled growth techniques. When x is equal to 0 or 1, the InAs and GaSb layers are connected with InSb or GaAs bonds, respectively. Planar vibrational modes (PVM's) localized at the interface are observed. The energies of the GaAs-like and InSb-like PVM's are studied as a function of x and are compared with results of a random-element isodisplacement model. RP SHANABROOK, BV (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. RI Bennett, Brian/A-8850-2008 OI Bennett, Brian/0000-0002-2437-4213 NR 14 TC 37 Z9 38 U1 0 U2 2 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1098-0121 J9 PHYS REV B JI Phys. Rev. B PD DEC 15 PY 1993 VL 48 IS 23 BP 17172 EP 17176 DI 10.1103/PhysRevB.48.17172 PG 5 WC Physics, Condensed Matter SC Physics GA MN530 UT WOS:A1993MN53000036 ER PT J AU BUOT, FA RAJAGOPAL, AK AF BUOT, FA RAJAGOPAL, AK TI HIGH-FREQUENCY BEHAVIOR OF QUANTUM-BASED DEVICES - EQUIVALENT-CIRCUIT, NONPERTURBATIVE-RESPONSE, AND PHASE-SPACE ANALYSES SO PHYSICAL REVIEW B LA English DT Article ID RESONANT-TUNNELING STRUCTURES; INTRINSIC BISTABILITY; HUSIMI REPRESENTATION; TRANSPORT; DYNAMICS; WIGNER; OSCILLATIONS; MECHANICS; SYSTEM; STATES AB The high-frequency response of resonant tunneling devices (RTD's), subjected to a time-dependent signal, is considered in two different situations when operating in the negative-differential-resistance (NDR) region: stable and unstable. The study of this behavior is considered from three different approaches, all based on the phase-space distribution-function formalism. In the stable case, the equivalent-circuit approach (ECA) is deduced from the published numerical results obtained by one of us (F.A.B. and collaborators) dealing with the complex dynamical aspects in phase space of quantum transport in RTD, operating at dc bias in the NDR region of its ideal characteristic current-voltage (I-V) curve. The ECA is found to be very useful in resolving the various outstanding controversies concerning the dynamical quantum transport behavior of RTD. For unstable operation in the NDR region, nonperturbative approaches are more appropriate. Here, a time-dependent transformation of phase space is found which transforms the quantum distribution (QDF) transport equation to the same form as that in the absence of a time-dependent signal. This time-dependent transformation is useful when the applied time-dependent electric field is assumed to be position independent. In a more general and realistic situation, an applied time-dependent voltage at the drain will self-consistently lead to a time-dependent and position-dependent potential inside the device. For this general situation, we introduce two different representations of quantum transport, namely, the Liouville representation and the phase-space fluid representation. The QDF solution has inherent undesirable features for studying the dynamics of phase space, which can be eliminated by special processing. This processing yields the positive definite Husimi distribution. It is suggested that the use of the Husimi distribution enables a microscopic dynamical viewpoint of ECA as well as shedding further light on the dynamical nature of the quantum inductance. RP BUOT, FA (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 27 TC 34 Z9 34 U1 1 U2 1 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1098-0121 J9 PHYS REV B JI Phys. Rev. B PD DEC 15 PY 1993 VL 48 IS 23 BP 17217 EP 17232 DI 10.1103/PhysRevB.48.17217 PG 16 WC Physics, Condensed Matter SC Physics GA MN530 UT WOS:A1993MN53000042 ER PT J AU WARNOCK, J JONKER, BT PETROU, A CHOU, WC LIU, X AF WARNOCK, J JONKER, BT PETROU, A CHOU, WC LIU, X TI EXCITON ENERGIES IN SHALLOW QUANTUM-WELLS AND SPIN SUPERLATTICES SO PHYSICAL REVIEW B LA English DT Article ID CDTE (CD,MN)TE; TRANSITION; BEHAVIOR AB We describe a general method of calculating exciton energies in shallow quantum wells. This technique is applicable to both single- and multiple-quantum-well systems, and is valid for both type-I and type-II systems, even under circumstances where the valence- and/or conduction-band offsets may be small compared to the exciton binding energy. Quantitative predictions of excitonic energies and relative intensities are made and compared with experimental data on a number of different shallow-well diluted magnetic semiconductor quantum well and superlattice systems. Based on these comparisons, it is shown that the model indeed provides a detailed description and analysis of the type-I-type-II transition and the behavior of excitons in a spin superlattice. In addition, the model also predicts and describes certain additional phenomena, such as metastable ''above-gap'' excitons which should exist in certain type-II systems. Also, reentrant type-I-type-II-type-I transitions are predicted under some circumstances. C1 USN, RES LAB, WASHINGTON, DC 20375 USA. SUNY BUFFALO, DEPT PHYS & ASTRON, AMHERST, NY 14260 USA. RP IBM CORP, THOMAS J WATSON RES CTR, DIV RES, POB 218, YORKTOWN HTS, NY 10598 USA. NR 25 TC 46 Z9 46 U1 0 U2 0 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 DEC 15 PY 1993 VL 48 IS 23 BP 17321 EP 17330 DI 10.1103/PhysRevB.48.17321 PG 10 WC Physics, Condensed Matter SC Physics GA MN530 UT WOS:A1993MN53000054 ER PT J AU PEDERSON, MR PICKETT, WE ERWIN, SC AF PEDERSON, MR PICKETT, WE ERWIN, SC TI ELECTRONIC-STRUCTURE INVESTIGATIONS OF SILOXENIC CLUSTERS AND FILMS SO PHYSICAL REVIEW B LA English DT Article ID POROUS SILICON; 1ST-PRINCIPLES; LUMINESCENCE; ORIGIN AB Calculations on two forms of siloxenic clusters and periodic films have been performed to address the unusual luminescence in porous silicon and to further investigate how the optical gap varies as a function of hydroxyl- or hydrogen-passivator concentration. Within conventional approximations to the density functional theory, our optimized cluster calculations confirm that low-dimensional siloxenic complexes, of stoichiometry [Si]:[O]:H] = 2:1:2, are most stable when the oxygen atoms form bridging bonds with pairs of silicon atoms. To aid in experimental characterization of siloxenic films, we present equilibrium geometries, electronic structures, chemically induced core-level shifts, and joint densities of states for two forms of siloxenic clusters. C1 UNIV PENN,DEPT PHYS,PHILADELPHIA,PA 19104. RP PEDERSON, MR (reprint author), USN,RES LAB,COMPLEX SYST THEORY BRANCH,WASHINGTON,DC 20375, USA. RI Erwin, Steven/B-1850-2009 NR 18 TC 10 Z9 11 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1098-0121 J9 PHYS REV B JI Phys. Rev. B PD DEC 15 PY 1993 VL 48 IS 23 BP 17400 EP 17405 DI 10.1103/PhysRevB.48.17400 PG 6 WC Physics, Condensed Matter SC Physics GA MN530 UT WOS:A1993MN53000064 ER PT J AU JACKSON, K KAXIRAS, E PEDERSON, MR AF JACKSON, K KAXIRAS, E PEDERSON, MR TI ELECTRONIC STATES OF GROUP-IV ENDOHEDRAL ATOMS IN C-28 SO PHYSICAL REVIEW B LA English DT Article ID LOCAL-DENSITY APPROXIMATION; C-60; C-28 AB We have systematically studied the interaction between the C28 fullerene molecule and the group-IVA endohedral atoms C, Si, Ge, and Sn, using state-of-the-art electronic structure and total-energy calculations based on density-functional theory. We find no covalent bonding between these atoms and the fullerene cage. The nature of the cage-atom interaction involves charge transfer from the endohedral atom to the cage which produces weak, mostly ionic binding. The degree of charge transfer increases with the atomic number of the endohedral atom. By comparing the electronic structure of the group-IVA endohedral cage compounds to Zr@C28 (a group-IVB endohedral), we find that the latter bonds strongly to the cage due to a covalent interaction between the Zr 4d states and the C28 states. We extrapolate the trends found for the group-IV endohedrals to suggest other possibly stable systems and to provide insight to the stability of the experimentally observed U@C28 complex. C1 HARVARD UNIV, DEPT PHYS, CAMBRIDGE, MA 02138 USA. HARVARD UNIV, DIV APPL SCI, CAMBRIDGE, MA 02138 USA. MAX PLANCK INST FESTKORPERFORSCH, W-7000 STUTTGART 80, GERMANY. USN, RES LAB, COMPLEX SYST THEORY BRANCH, WASHINGTON, DC 20375 USA. RP CENT MICHIGAN UNIV, DEPT PHYS, MT PLEASANT, MI 48859 USA. OI Jackson, Koblar/0000-0002-5342-7978 NR 16 TC 41 Z9 42 U1 0 U2 3 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 DEC 15 PY 1993 VL 48 IS 23 BP 17556 EP 17561 DI 10.1103/PhysRevB.48.17556 PG 6 WC Physics, Condensed Matter SC Physics GA MN530 UT WOS:A1993MN53000084 ER PT J AU CARLOS, WE FREITAS, JA KHAN, MA OLSON, DT KUZNIA, JN AF CARLOS, WE FREITAS, JA KHAN, MA OLSON, DT KUZNIA, JN TI ELECTRON-SPIN-RESONANCE STUDIES OF DONORS IN WURTZITE GAN SO PHYSICAL REVIEW B LA English DT Article ID CHEMICAL VAPOR-DEPOSITION; NUCLEAR-POLARIZATION; OVERHAUSER SHIFT; CONDUCTION; LAYERS; SPECTRA; GROWTH; INP AB Electron-spin-resonance (ESR) measurements have been performed on a series of wurtzite GaN films grown on sapphire substrates by low-pressure metal-organic chemical-vapor deposition. The sample set included films grown with both AIN and GaN buffer layers. The ESR signal results from residual donors with g(1)=1.9510 and g(1)=1.9483. The g value and the effective mass can be explained using a five-band k.p model. Nuclear hyperfine interactions are observed as a shift in the central resonance position, due to the Overhauser effect from which the density of the wave function at the Ga nucleus is derived. The ESR lines all have quite a sharp Lorentzian shape due to motional narrowing. At low temperatures (T < 20 K) the linewidth narrows with increasing temperature, consistent with electrons hopping from donor site to donor site. At higher temperatures the line broadens due to electron-phonon interactions. The concentration of uncompensated donors is independent of film thickness for GaN buffered films but increases monotonically with thickness for A1N buffered films, probably due to a decrease in the concentration of compensating centers. Photoluminescence measurements indicate that only the thickest films are homogeneous along the growth direction. C1 SACHS FREEMAN ASSOCIATES INC, LANDOVER, MD 20785 USA. APA OPT INC, BLAINE, MN 55434 USA. RP CARLOS, WE (reprint author), USN, RES LAB, WASHINGTON, DC 20375 USA. NR 40 TC 112 Z9 112 U1 0 U2 5 PU AMER PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1098-0121 J9 PHYS REV B JI Phys. Rev. B PD DEC 15 PY 1993 VL 48 IS 24 BP 17878 EP 17884 DI 10.1103/PhysRevB.48.17878 PG 7 WC Physics, Condensed Matter SC Physics GA MQ165 UT WOS:A1993MQ16500023 ER PT J AU MRSTIK, BJ MCMARR, PJ AF MRSTIK, BJ MCMARR, PJ TI EVIDENCE OF A LONG-RANGE DENSITY GRADIENT IN SIO2-FILMS ON SI FROM H-2-PERMEABILITY MEASUREMENTS SO PHYSICAL REVIEW B LA English DT Article ID SI-SIO2 INTERFACE STATES; SILICON DIOXIDE; POSTIRRADIATION EXPOSURE; VITREOUS SILICA; THERMAL OXIDES; THIN-FILMS; HYDROGEN; SIO2-FILMS; OXYGEN; DIFFUSION AB We describe a technique for the measurement of the diffusivity, solubility, and permeability of Hz through SiO2 thermally grown on Si substrates at room temperature. We have applied this technique to determine the dependence of the H-2 permeability on oxide thickness and growth temperature. Since permeability depends strongly on density, these measurements provide a sensitive probe of the oxide density. Our results indicate that the H-2 permeability is considerably less in SiO2 films thermally grown on Si : substrates than through bulk SiO2, in agreement with previous works which had indicated that thermally grown oxides are denser than bulk SiO2. The permeability is found to decrease with oxide thickness, indicating that thinner oxides-have larger densities than thicker oxides. Oxides grown at high temperatures are found to have higher permeabilities than oxides of similar thickness grown at lower temperatures. We present evidence that the dependence of permeability on oxide thickness results from a density gradient throughout the oxide rather than from a uniform reduction of the oxide density as the oxide becomes thicker. C1 SFA INC, LANDOVER, MD 20785 USA. RP MRSTIK, BJ (reprint author), USN, RES LAB, CODE 6816, WASHINGTON, DC 20375 USA. NR 49 TC 17 Z9 17 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 DEC 15 PY 1993 VL 48 IS 24 BP 17972 EP 17985 DI 10.1103/PhysRevB.48.17972 PG 14 WC Physics, Condensed Matter SC Physics GA MQ165 UT WOS:A1993MQ16500037 ER PT J AU KNIPP, PA REINECKE, TL AF KNIPP, PA REINECKE, TL TI EFFECTS OF BOUNDARY-CONDITIONS ON CONFINED OPTICAL PHONONS IN SEMICONDUCTOR NANOSTRUCTURES SO PHYSICAL REVIEW B LA English DT Article ID QUANTUM-WELLS; ELECTRON-SCATTERING; INTERFACE MODES; SUPERLATTICES; SYSTEMS; WIRES AB The dependence of physically observable quantities such as electron-phonon scattering rates on the boundary conditions for the optical phonons confined in polar semiconductor quantum wells, quantum wires, and quantum dots are examined within the dielectric continuum approach. Calculations of the confined phonons and of their contributions to the scattering rates are made using the boundary conditions of Maxwell's equations at the interfaces and the condition that the ionic displacements go to zero there. These results are compared with the results obtained using only the condition that Maxwell's equations be satisfied (the usual dielectric continuum model). We find that in the absence of phonon dispersion the rates of scattering by the confined phonons in these two cases are identical even though the individual phonons differ. We attribute this result to the fact that physically observable quantities involve sums over complete sets of states. As a part of the present work we have derived an interesting relation between the contributions of the confined phonons and the interface phonons to the scattering rates in nanostructures. This relation is useful in, for example, obtaining the rates of scattering by the confined modes for geometries of low symmetry where straightforward sums are difficult. C1 USN,RES LAB,WASHINGTON,DC 20375. RP KNIPP, PA (reprint author), CHRISTOPHER NEWPORT UNIV,DEPT PHYS & COMP SCI,NEWPORT NEWS,VA 23606, USA. NR 15 TC 32 Z9 32 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 DEC 15 PY 1993 VL 48 IS 24 BP 18037 EP 18042 DI 10.1103/PhysRevB.48.18037 PG 6 WC Physics, Condensed Matter SC Physics GA MQ165 UT WOS:A1993MQ16500045 ER PT J AU ALTMAN, EI COLTON, RJ AF ALTMAN, EI COLTON, RJ TI DETERMINATION OF THE ORIENTATION OF C-60 ADSORBED ON AU(111) AND AG(111) SO PHYSICAL REVIEW B LA English DT Article ID SCANNING TUNNELING MICROSCOPY; C60; NUCLEATION; MOLECULES AB Adsorbate bonding and preferred adsorption sites and rotational orientations of C-60 on Au(111) and Ag(111) were studied using scanning tunneling microscopy (STM) and related techniques. Spatially resolved tunneling spectroscopy and barrier height measurements indicated that bonding occurs by charge transfer from the metal to C-60 The internal structure of adsorbed C-60 observed by STM was found to be a strong function of the adsorption site, the molecular orientation, and the tunneling bias. Occupied state images were found to reflect the adsorption site symmetry while unoccupied state images reflected the molecular symmetry. In domains where all the molecules were in equivalent adsorption sites, the observed internal structure of adsorbed C-60 was assigned to an on-top site with the five-membered ring on the surface. RP ALTMAN, EI (reprint author), USN,RES LAB,DIV CHEM,CODE 6177,WASHINGTON,DC 20375, USA. NR 15 TC 232 Z9 232 U1 5 U2 45 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 DEC 15 PY 1993 VL 48 IS 24 BP 18244 EP 18249 DI 10.1103/PhysRevB.48.18244 PG 6 WC Physics, Condensed Matter SC Physics GA MQ165 UT WOS:A1993MQ16500069 ER PT J AU FU, LP YU, WY PETROU, A WARNOCK, J JONKER, BT AF FU, LP YU, WY PETROU, A WARNOCK, J JONKER, BT TI COMPETING SPIN-EXCHANGE INTERACTIONS IN ZN1-XMNXSE/ZN1-YFEYSE MULTIPLE-QUANTUM-WELL STRUCTURES SO PHYSICAL REVIEW B LA English DT Note ID MAGNETIZATION AB We report the study of a mixed-spin multiple-quantum-well system consisting of alternating Zn1-xMnxSe and Zn1-yFeySe layers, grown by molecular-beam epitaxy. The two spin components of the heavy-hole exciton are each dominated by different exchange interactions as revealed by their temperature and magnetic-field dependence. We find that the energy of the spin-down sigma(+) component (-3/2, - 1/2) is well described by exchange interactions of the electron and holes with Mn2+ ions (Brillouin paramagnet), while the energy of the spin-up sigma(-) component (+3/2, +1/2) is determined by the interactions of carriers with Fe2+ ions (Van Vleck paramagnet). Thus, these tailored heterostructures permit simultaneous study of Brillouin and Van Vleck paramagnetism as well as associated carrier dynamics in a single structure. C1 SUNY BUFFALO,CTR ELECTR & ELECTROOPT MAT,BUFFALO,NY 14260. IBM CORP,THOMAS J WATSON RES CTR,DIV RES,YORKTOWN HTS,NY 10598. USN,RES LAB,WASHINGTON,DC 20375. RP FU, LP (reprint author), SUNY BUFFALO,DEPT PHYS,BUFFALO,NY 14260, USA. NR 10 TC 4 Z9 4 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD DEC 15 PY 1993 VL 48 IS 24 BP 18272 EP 18275 DI 10.1103/PhysRevB.48.18272 PG 4 WC Physics, Condensed Matter SC Physics GA MQ165 UT WOS:A1993MQ16500076 ER PT J AU REEVE, SW WEIMER, WA AF REEVE, SW WEIMER, WA TI PLASMA DIAGNOSTICS OF A DC ARCJET CHEMICAL-VAPOR-DEPOSITION DIAMOND REACTOR SO THIN SOLID FILMS LA English DT Article ID METHANE; PARTICLES; JET AB Plasma diagnostic measurements were performed on a d.c. arcjet chemical vapor deposition diamond reactor. The electron temperature and density near the substrate were determined using a floating double-probe technique. The gas phase excitation temperature was determined by fitting the optical emission spectrum from the d(3)II(g)--> a(3)II(u), transition of the C-2 molecule to a calculated emission spectrum. An electron temperature of 2.0(+/-0.2) eV and a lower limit electron density of similar to 5.7(+/-1) x 10(10) cm(-3) were measured. Results from the optical emission analysis gave excitation temperatures of similar to 2000-2200 K. The disparity between the electron, the C-2 rotational and vibrational temperatures, and the previously determined gas temperatures (<3000 K) indicate that the plasma is not in thermal equilibrium In addition, as a result of the high gas velocities present between the gun and substrate (maximum similar to 1.1 x 10(5) cm s(-1)), the residence time in the plasma is insufficient for the species concentrations to reach thermodynamic equilibrium. Therefore, the chemistry which occurs in the plasma, and the dependent flux of species transported to the substrate are dominated by reaction-rate-limited chemical kinetics. C1 USN, CTR AIR WARFARE, RES DEPT, DIV CHEM, CHINA LAKE, CA 93555 USA. NR 18 TC 13 Z9 14 U1 1 U2 1 PU ELSEVIER SCIENCE SA PI LAUSANNE PA PO BOX 564, 1001 LAUSANNE, SWITZERLAND SN 0040-6090 J9 THIN SOLID FILMS JI Thin Solid Films PD DEC 15 PY 1993 VL 236 IS 1-2 BP 91 EP 95 DI 10.1016/0040-6090(93)90649-A PG 5 WC Materials Science, Multidisciplinary; Materials Science, Coatings & Films; Physics, Applied; Physics, Condensed Matter SC Materials Science; Physics GA MM810 UT WOS:A1993MM81000018 ER PT J AU QADRI, SB KIM, C SKELTON, EF HAHN, T BUTLER, JE AF QADRI, SB KIM, C SKELTON, EF HAHN, T BUTLER, JE TI THERMAL-EXPANSION OF CHEMICAL-VAPOR-DEPOSITION GROWN DIAMOND FILMS SO THIN SOLID FILMS LA English DT Article; Proceedings Paper CT 20th International Conference on Metallurgical Coatings and Thin Films CY APR 19-23, 1993 CL SAN DIEGO, CA ID METASTABLE GROWTH; PHASES AB The thermal expansivity of chemical vapor deposition (CVD) grown diamond films has been measured from 30 to 700 degrees C by two different techniques. The macroscopic expansivity was determined by standard dilatometric methods, while the microscopic thermal expansivity was measured from the shift of large angle X-ray diffraction peaks. The expansivities, as determined from both techniques, are in agreement, within their experimental errors, but larger than published values for bulk diamond. The difference is assumed to be the result of the presence of non-diamond carbon and defect inclusions in the CVD films. RP QADRI, SB (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. RI Butler, James/B-7965-2008 OI Butler, James/0000-0002-4794-7176 NR 8 TC 3 Z9 3 U1 0 U2 5 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 DEC 15 PY 1993 VL 236 IS 1-2 BP 103 EP 105 DI 10.1016/0040-6090(93)90651-5 PG 3 WC Materials Science, Multidisciplinary; Materials Science, Coatings & Films; Physics, Applied; Physics, Condensed Matter SC Materials Science; Physics GA MM810 UT WOS:A1993MM81000020 ER PT J AU KESKINEN, MJ SATYANARAYANA, P AF KESKINEN, MJ SATYANARAYANA, P TI NONLINEAR UNSTABLE AURORAL-ARC DRIVEN THERMOSPHERIC WINDS IN AN IONOSPHERE-MAGNETOSPHERE COUPLED MODEL SO GEOPHYSICAL RESEARCH LETTERS LA English DT Article ID HIGH-LATITUDE IONOSPHERE; DOPPLER IMAGING-SYSTEM; NEUTRAL WINDS; DYNAMICS; INSTABILITY; FEATURES AB The nonlinear evolution of thermospheric winds in an ionosphere-magnetosphere coupled model has been studied for the first time for, a dynamic unstable auroral-arc environment. We treat the problem using a multi-layer, quasi-three-dimensional model which averages in altitude the thermospheric dynamics over each layer. For the upper thermosphere, we find that (1) the thermosphere can respond to the ionospheric Kelvin-Helmholtz (KH) instability on temporal scales on the order of an hour, depending on ambient conditions, and on spatial scales of tens to hundreds of kilometers, (2) strong thermospheric meridional and zonal vortical flows with embedded nonlinear jet-like structures can be generated by the ionospheric/magnetospheric KH instability and (3) neutral thermospheric winds, vortices, and associated power spectra develop in a distinctly different manner in the presence of magnetospheric coupling effects. Comparison with recent observations is made. C1 SCI APPLICAT INT CORP,MCLEAN,VA 22102. RP KESKINEN, MJ (reprint author), USN,RES LAB,CODE 6794,WASHINGTON,DC 20375, USA. NR 21 TC 3 Z9 3 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 DEC 14 PY 1993 VL 20 IS 23 BP 2687 EP 2690 DI 10.1029/93GL01978 PG 4 WC Geosciences, Multidisciplinary SC Geology GA MP205 UT WOS:A1993MP20500028 ER PT J AU HUBA, JD AF HUBA, JD TI THEORY OF KILOMETER-SIZE DENSITY WAVES IN THE NIGHTSIDE VENUS IONOSPHERE SO GEOPHYSICAL RESEARCH LETTERS LA English DT Article ID IRREGULARITIES AB Quasi-sinusoidal density waves were frequently observed during the end of the Pioneer Venus Orbiter (PVO) mission when the orbiter was at low periapsis [Brace, this issue]. These waves occur at altitudes approximately 145 - 155 km and have wavelengths approximately 1 km. It is suggested that a radial, ambipolar electric field E0, directed downward, is established in the Venus ionosphere during electron pressure enhancements above approximately 160 km. This field generates an electron E x B drift VE; the ions move radially and do not E x B drift because they are unmagnetized (i.e., v(in) >> OMEGA(i)). This drift is shown to drive a collisional drift wave instability for sufficiently large values of V(E), nominally, V(E) > upsilon(i) where upsilon(i) is the ion thermal velocity. For parameters typical of the nightside Venus ionosphere, this instability generates plasma fluctuations with wavelengths approximately 1 km, consistent with observations. RP HUBA, JD (reprint author), USN,RES LAB,DIV PLASMA PHYS,BEAM PHYS BRANCH,WASHINGTON,DC 20375, USA. NR 16 TC 2 Z9 2 U1 0 U2 0 PU AMER GEOPHYSICAL UNION PI WASHINGTON PA 2000 FLORIDA AVE NW, WASHINGTON, DC 20009 SN 0094-8276 J9 GEOPHYS RES LETT JI Geophys. Res. Lett. PD DEC 14 PY 1993 VL 20 IS 23 BP 2763 EP 2766 DI 10.1029/93GL02421 PG 4 WC Geosciences, Multidisciplinary SC Geology GA MP205 UT WOS:A1993MP20500047 ER PT J AU HENDERSHOT, DG GASKILL, DK JUSTUS, BL FATEMI, M BERRY, AD AF HENDERSHOT, DG GASKILL, DK JUSTUS, BL FATEMI, M BERRY, AD TI ORGANOMETALLIC CHEMICAL-VAPOR-DEPOSITION AND CHARACTERIZATION OF INDIUM-PHOSPHIDE NANOCRYSTALS IN VYCOR POROUS-GLASS SO APPLIED PHYSICS LETTERS LA English DT Article ID SEMICONDUCTOR; SPECTRUM AB Indium phosphide has been deposited in 40 and 150 angstrom Vycor porous glass by the reaction of trimethylindium with excess PH3. X-ray diffraction (XRD) of the red, transparent samples confirms the presence of crystalline indium phosphide. The amount of III-V material deposited within the glass matrix (loading) and annealing conditions influence the crystallinity and particle size of the nanocrystallites. The absorption spectra of vacuum-annealed samples is blue shifted with respect to bulk InP, with maxima ranging from 500 to 700 nm for both the 40 and 150 angstrom samples and is consistent with size quantization. The nonlinear optical properties of these nanocrystallite composites have been evaluated by Z-scan measurements and are characterized by a defocusing refractive nonlinearity influenced by a substantial nonlinear loss presumed to be caused by two-photon absorption. RP HENDERSHOT, DG (reprint author), USN,RES LAB,ADV MAT SYNTHESIS LAB,WASHINGTON,DC 20375, USA. NR 15 TC 36 Z9 36 U1 2 U2 4 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0003-6951 J9 APPL PHYS LETT JI Appl. Phys. Lett. PD DEC 13 PY 1993 VL 63 IS 24 BP 3324 EP 3326 DI 10.1063/1.110189 PG 3 WC Physics, Applied SC Physics GA MN375 UT WOS:A1993MN37500025 ER PT J AU GARLAND, FC GARLAND, CF GORHAM, ED MILLER, MR CUNNION, SO BERG, SW BALAZS, LL AF GARLAND, FC GARLAND, CF GORHAM, ED MILLER, MR CUNNION, SO BERG, SW BALAZS, LL TI LACK OF ASSOCIATION OF HUMAN-IMMUNODEFICIENCY-VIRUS SEROCONVERSION WITH VISITS TO FOREIGN PORTS IN US NAVY PERSONNEL SO ARCHIVES OF INTERNAL MEDICINE LA English DT Article ID NAIROBI PROSTITUTES; HIV; EPIDEMIOLOGY; PREVALENCE; ANTIBODIES; TANZANIA; HAITI AB Background: The US Navy visits ports on all continents and many islands of the world, many of which are reported to have a high endemicity of human immunodeficiency virus (HIV) infection. The objective of this study was to determine whether visits to foreign ports by active-duty navy personnel were associated with increased risk of HIV infection. Methods: The Naval Health Research Center in San Diego, Calif, maintains records of all HIV enzyme-linked immunosorbent assay and Western blot tests given in the navy. This information, along with career histories and ship movement data, was used in a nested case-control design to examine the relationship between visits to the 100 foreign ports most frequently visited by the navy and risk of HIV seroconversion. All visits to a port and total time in each port during the study period were examined. A total of 813 serocon-verters were matched to 6993 seronegative active-duty controls by age, race, sex, occupational group, home port, and year of test. Results: Estimated relative risks of seroconversion associated with visits to foreign ports showed no statistically significant excess risk of HIV infection for navy personnel after visits to any foreign port. Conclusions: These results do not imply that an individual's risk of acquisition of HIV would be less in a foreign port if the individual engaged in high-risk activity there. Rather, they imply that despite the mobility of the US Navy and the large variation in HIV seroprevalence rates throughout the world, navy personnel generally do not appear to be acquiring HIV infections abroad. C1 UNIV CALIF SAN DIEGO,SCH MED,DEPT FAMILY & PREVENT MED,SAN DIEGO,CA 92103. US PHS,BETHESDA,MD. UNIFORMED SERV UNIV HLTH SCI,BETHESDA,MD. USN,CTR ENVIRONM HLTH,NORFOLK,VA. RP GARLAND, FC (reprint author), USN,HLTH RES CTR,DEPT HLTH SCI & EPIDEMIOL,DIV EPIDEMIOL,POB 85122,SAN DIEGO,CA 92138, USA. NR 30 TC 2 Z9 2 U1 0 U2 0 PU AMER MEDICAL ASSOC PI CHICAGO PA 515 N STATE ST, CHICAGO, IL 60610 SN 0003-9926 J9 ARCH INTERN MED JI Arch. Intern. Med. PD DEC 13 PY 1993 VL 153 IS 23 BP 2685 EP 2691 PG 7 WC Medicine, General & Internal SC General & Internal Medicine GA MW097 UT WOS:A1993MW09700009 PM 8250664 ER PT J AU SELINGER, JV SCHNUR, JM AF SELINGER, JV SCHNUR, JM TI THEORY OF CHIRAL LIPID TUBULES SO PHYSICAL REVIEW LETTERS LA English DT Article ID HELICAL SUPERSTRUCTURES; CIRCULAR-DICHROISM; BILAYER-MEMBRANES; MODULATED PHASES; ORDER; MICROSTRUCTURES; PHOSPHOLIPIDS; DIFFRACTION; CRYSTALLINE; AMPHIPHILE AB We present a continuum theory for the self-assembly of cylindrical tubules from chiral lipid bilayers in any tilted fluid phase. This theory shows that tubule formation is driven by an intrinsic bending force due to molecular chirality, and gives the radius in terms of the continuum parameters. The radius diverges as an untilted phase is approached. The theory also predicts that the tilt direction is modulated in a helical striped pattern on the tubule. This striped pattern is consistent with helical patterns observed in electron micrographs of lipid tubules. RP USN, RES LAB, CTR BIOMOLEC SCI & ENGN, CODE 6900, 455 OVERLOOK AVE SW, WASHINGTON, DC 20375 USA. RI Selinger, Jonathan/D-1445-2010 OI Selinger, Jonathan/0000-0002-4982-2457 NR 46 TC 115 Z9 116 U1 2 U2 18 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 DEC 13 PY 1993 VL 71 IS 24 BP 4091 EP 4094 DI 10.1103/PhysRevLett.71.4091 PG 4 WC Physics, Multidisciplinary SC Physics GA ML868 UT WOS:A1993ML86800050 ER PT J AU MARISKA, JT DOSCHEK, GA BENTLEY, RD AF MARISKA, JT DOSCHEK, GA BENTLEY, RD TI FLARE PLASMA DYNAMICS OBSERVED WITH THE YOHKOH BRAGG CRYSTAL SPECTROMETER .1. PROPERTIES OF THE CA-XIX RESONANCE LINE SO ASTROPHYSICAL JOURNAL LA English DT Article DE SUN, FLARES; SUN, X-RAYS, GAMMA-RAYS ID SOLAR-FLARES; IMPULSIVE PHASE; EVAPORATION AB Using data from the Bragg crystal spectrometer on the Yohkoh spacecraft we have compute measures the total intensity, centroid position, and line width for the resonance line of Ca XIX during the rise phase and after maximum for 219 solar flares. The difference between the centroid positions early and late in each flare yields a measure of the line-of-sight velocity shift of the line centroid. We find a trend in the average value of the centroid shift with distance from Sun center suggesting radial mass motions with a characteristic velocity of 58 km s-1. There is a correlation between the rise-phase line widths and the centroid shift. We find no correlation between the centroid shift and the peak intensity, rise time, and total flare duration; and no correlation between the line width and the distance from Sun center, the peak intensity, rise time, and total flare duration. These results do not conclusively support or refute the simple electron-beam-driven model or the thermal model for the rise phase of a solar flare. C1 UCL, MULLARD SPACE SCI LAB, HOLMBURY RH5 6NT, ENGLAND. RP MARISKA, JT (reprint author), USN, RES LAB, EO HULBURT CTR SPACE RES, CODE 7670, WASHINGTON, DC 20375 USA. NR 14 TC 63 Z9 63 U1 0 U2 0 PU IOP PUBLISHING LTD PI BRISTOL PA TEMPLE CIRCUS, TEMPLE WAY, BRISTOL BS1 6BE, ENGLAND SN 0004-637X J9 ASTROPHYS J JI Astrophys. J. PD DEC 10 PY 1993 VL 419 IS 1 BP 418 EP 425 DI 10.1086/173494 PN 1 PG 8 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA MK864 UT WOS:A1993MK86400042 ER PT J AU STENGER, DA PIKE, CJ HICKMAN, JJ COTMAN, CW AF STENGER, DA PIKE, CJ HICKMAN, JJ COTMAN, CW TI SURFACE DETERMINANTS OF NEURONAL SURVIVAL AND GROWTH ON SELF-ASSEMBLED MONOLAYERS IN CULTURE SO BRAIN RESEARCH LA English DT Article DE SELF-ASSEMBLED MONOLAYER; CULTURED HIPPOCAMPAL NEURON; SURFACE CHEMISTRY; SURFACE ANALYSIS; X-RAY PHOTOELECTRON SPECTROSCOPY; NEURON SURVIVAL; NEURON GROWTH ID DISPERSED CELL-CULTURE; HIPPOCAMPAL-NEURONS; IMMOBILIZATION; ADSORPTION; MOLECULES; POLARITY; PROTEINS; SULFATE; GOLD AB We have studied the modulation of hippocampal neuron morphological development in vitro using surfaces derivatized with aminosilane self-assembled monolayers (SAMs). The efficacies of model SAMs. alone, or in combination with adsorbed heparan sulfate glycosaminoglycan (HS), are related to the physical and chemical properties of the surfaces. These properties are determined using X-ray photoelectron spectroscopy (XPS), optical ellipsometry, and wettability measurements. The ability of surfaces to promote somal adhesion and the maintenance of discrete neurites appears to be sensitive to the density and accessibility of positively charged amine or amide groups, and has less of an apparent relationship to the surface density of uncharged amines. Aromatic ring-containing aminosilanes are ineffective in promoting neuron growth, while adsorbed HS augments the neurite-promoting capacity of one marginally adhesive SAM. These results are relevant to an improved understanding of the 'non-specific' contributions of the substrate in affecting neuronal development and the rational design of model surface coatings for neuronal culture. C1 UNIV CALIF IRVINE,DEPT PSYCHOBIOL,IRVINE,CA 92717. SCI APPLICAT INT CORP,MCLEAN,VA 22102. RP STENGER, DA (reprint author), USN,RES LAB,CODE 6900,WASHINGTON,DC 20375, USA. FU NIA NIH HHS [AG07918] NR 31 TC 93 Z9 94 U1 2 U2 15 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0006-8993 J9 BRAIN RES JI Brain Res. PD DEC 10 PY 1993 VL 630 IS 1-2 BP 136 EP 147 DI 10.1016/0006-8993(93)90651-3 PG 12 WC Neurosciences SC Neurosciences & Neurology GA MK032 UT WOS:A1993MK03200017 PM 8118680 ER PT J AU SCHNUR, JM AF SCHNUR, JM TI LIPID TUBULES - A PARADIGM FOR MOLECULARLY ENGINEERED STRUCTURES SO SCIENCE LA English DT Article ID BILAYER-MEMBRANES; HELICAL SUPERSTRUCTURES; MICROSTRUCTURES; PHOSPHATIDYLCHOLINE; ORGANIZATION; AMPHIPHILES; CHIRALITY; FILAMENTS; BEHAVIOR; ORDER AB The use of molecular self-assembly to fabricate microstructures suitable for advanced material development is described. Templating techniques that transform biomolecular self-assemblies into rugged and stable nano- and microstructures are described. By using a lipid-based microcylinder (tubule) as a paradigm, the path followed from research and development to emerging technological applications is detailed. This process includes modification of the lipid molecular structure, the formation and subsequent characterization of cylindrical microstructures, the use of these structures as templates for metallization, and the characterization and assessment of these hollow metal microcylinders for several potential applications. RP USN, RES LAB, CTR BIOMOLEC SCI & ENGN, CODE 6900, WASHINGTON, DC 20375 USA. NR 86 TC 606 Z9 614 U1 7 U2 77 PU AMER ASSOC ADVANCEMENT SCIENCE PI WASHINGTON PA 1200 NEW YORK AVE, NW, WASHINGTON, DC 20005 USA SN 0036-8075 EI 1095-9203 J9 SCIENCE JI Science PD DEC 10 PY 1993 VL 262 IS 5140 BP 1669 EP 1676 DI 10.1126/science.262.5140.1669 PG 8 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA ML220 UT WOS:A1993ML22000028 PM 17781785 ER PT J AU VARGO, TG GARDELLA, JA CALVERT, JM CHEN, MS AF VARGO, TG GARDELLA, JA CALVERT, JM CHEN, MS TI ADHESIVE ELECTROLESS METALLIZATION OF FLUOROPOLYMERIC SUBSTRATES SO SCIENCE LA English DT Article ID LITHOGRAPHY; SURFACES; POLY(TETRAFLUOROETHYLENE); FILMS AB A process for producing patterned metal deposits on fluoropolymeric substrates is described. A metal ion-chelating organosilane is chemisorbed by self-assembly onto a fluoropolymer surface after radio-frequency glow discharge plasma surface hydroxylation. Positional modulation of the surface hydrophobicity is illustrated by wetting. The silane covalently binds an aqueous palladium catalyst and subsequent electroless deposition yields homogeneous or patterned metal deposits that exhibit excellent adhesion to the fluoropolymer. C1 SUNY BUFFALO,DEPT CHEM,BUFFALO,NY 14214. USN,RES LAB,CTR BIOMOLEC SCI & ENGN CODE 6900,WASHINGTON,DC 20375. GEOCENTERS INC,FT WASHINGTON,MD 20744. NR 20 TC 60 Z9 60 U1 0 U2 5 PU AMER ASSOC ADVANCEMENT SCIENCE PI WASHINGTON PA 1200 NEW YORK AVE, NW, WASHINGTON, DC 20005 SN 0036-8075 J9 SCIENCE JI Science PD DEC 10 PY 1993 VL 262 IS 5140 BP 1711 EP 1715 DI 10.1126/science.262.5140.1711 PG 5 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA ML220 UT WOS:A1993ML22000034 PM 17781789 ER PT J AU WILLEMS, GC KNOUSE, DR AF WILLEMS, GC KNOUSE, DR TI A SIMPLE STEP PROCEDURE FINDS THE TIME RESPONSE OF FILTERED DIGITAL DATA SO EDN LA English DT Article RP WILLEMS, GC (reprint author), USN,BIODYNAM LAB,WASHINGTON,DC 20350, USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU CAHNERS-DENVER PUBLISHING CO PI HIGHLANDS RANCH PA 8773 S RIDGELINE BLVD, HIGHLANDS RANCH, CO 80126-2329 SN 0012-7515 J9 EDN JI EDN PD DEC 9 PY 1993 VL 38 IS 25 BP 139 EP 142 PG 4 WC Engineering, Electrical & Electronic SC Engineering GA MM143 UT WOS:A1993MM14300017 ER PT J AU PASTERNACK, L RICE, JK AF PASTERNACK, L RICE, JK TI LASER-ABLATION OF NH4NO3 SO JOURNAL OF PHYSICAL CHEMISTRY LA English DT Article ID MATRIX-ISOLATION; IR-SPECTRA; INFRARED-ABSORPTION; AMMONIUM-NITRATE; ARGON MATRICES; NITRIC-OXIDE; SOLID ARGON; WATER DIMER; INTENSITIES; DECOMPOSITION AB The laser ablation of ammonium nitrate has been studied, with products collected under low-pressure conditions on a cryogenic argon matrix surface. Relative product populations are analyzed using FTIR spectroscopy. Large effects are observed as the laser fluence and wavelengths are changed. Using 1064-nm pulses or low fluences of 532 nm, NH3 and HNO3 are most abundant with smaller (or negligible) quantities of NO, NO2, and N2O. At 266 nm and higher fluences of 532 nm, the reactions produce larger populations of NO, NO2, and small amounts of N2O. Dimers and other aggregates of H2O, N2O, and NO are observed in the FTIR spectra and are attributed to migration in or condensation near the matrix. In addition, isotopic substitution of N-15 in the NH4 and NO3 components of ammonium nitrate results in some scrambling of the NO and N2O products but not the HNO3 product, suggesting that multiple collisions leading to secondary reaction products of the nitrogen oxides are occurring. C1 USN,DIV CHEM,RES LAB,CODE 6111,WASHINGTON,DC 20375. NR 36 TC 4 Z9 4 U1 1 U2 5 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0022-3654 J9 J PHYS CHEM-US JI J. Phys. Chem. PD DEC 9 PY 1993 VL 97 IS 49 BP 12805 EP 12810 DI 10.1021/j100151a029 PG 6 WC Chemistry, Physical SC Chemistry GA ML667 UT WOS:A1993ML66700029 ER PT J AU NGAI, KL ROLAND, CM AF NGAI, KL ROLAND, CM TI CHEMICAL-STRUCTURE AND INTERMOLECULAR COOPERATIVITY - DIELECTRIC-RELAXATION RESULTS SO MACROMOLECULES LA English DT Article ID LOCAL CHAIN MOTION; NEUTRON-SCATTERING EXPERIMENTS; GLASS-TRANSITION TEMPERATURE; BULK AMORPHOUS POLYMERS; SEGMENTAL RELAXATION; CONFORMATIONAL TRANSITIONS; POLYVINYL ACETATE); DYNAMICS; BEHAVIOR; LIQUIDS AB The effect of chemical structure on the segmental relaxation behavior is examined for a wide range of polymers. Both the time and temperature dependence of the glass transition dispersion in the dielectric loss spectrum are shown to be correlated with the degree to which local structure engenders steric constraints on the relaxation from neighboring nonbonded segments. The polymers studied exhibit a range of segmental relaxation behavior. For polymers with smooth, compact, symmetrical chain backbones, segmental relaxation times have a near Arrhenius temperature dependence, representing the limiting-type behavior associated with relatively unconstrained (''Debye'') relaxation. Polymers having less flexible backbones and/or sterically-hindering pendant groups exhibit broad segmental dispersions and temperature dependencies near the extreme fragile edge; these characteristics reflect segmental relaxation that is strongly intermolecularly cooperative. The data for polymers parallel observations made on small-molecule glass-forming liquids, whose chemical structure similarly governs the strength of the intermolecular coupling, and thus the time and temperature dependence of segmental relaxation. C1 USN, RES LAB, WASHINGTON, DC 20375 USA. NR 59 TC 248 Z9 250 U1 3 U2 33 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0024-9297 J9 MACROMOLECULES JI Macromolecules PD DEC 6 PY 1993 VL 26 IS 25 BP 6824 EP 6830 DI 10.1021/ma00077a019 PG 7 WC Polymer Science SC Polymer Science GA ML329 UT WOS:A1993ML32900019 ER PT J AU HO, T WYNNE, KJ NISSAN, RA AF HO, T WYNNE, KJ NISSAN, RA TI POLYDIMETHYLSILOXANE UREA URETHANE COPOLYMERS WITH 1,4-BENZENEDIMETHANOL AS CHAIN EXTENDER SO MACROMOLECULES LA English DT Article ID MECHANICAL-PROPERTIES; POLYURETHANE AB An investigation of polyurethanes and polyureas containing unusual diols directed toward the formation of minimally adhesive surfaces is reported. A two-step polymerization method was used to prepare dimethylsiloxane-urea-urethane copolymers with 1,4-benzenedimethanol as the chain extender. First, the reaction between isophorone diiisocyanate and benzenedimethanol was carried out in bulk at elevated temperatures without a catalyst. In the second stage, the reaction between aminopropyl end-capped dimethylsiloxane oligomers and diisocyanate intermediates was carried out in tetrahydrofuran solution at room temperature. Copolymers with chain extenders were found to be superior to those without chain extenders in thermal and mechanical properties. The improvements are due to the additional interactions between urea and urethane linkages. These interactions occur in both soft and hard segment domains. C1 OFF NAVAL RES,DIV CHEM,ARLINGTON,VA 22217. GEORGE MASON UNIV,DEPT CHEM,FAIRFAX,VA 22030. USN,RES LAB,MAT CHEM BRANCH,WASHINGTON,DC 20375. USN,CTR AIR WEAPONS,DIV CHEM,CHINA LAKE,CA 93555. NR 23 TC 37 Z9 39 U1 1 U2 4 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0024-9297 J9 MACROMOLECULES JI Macromolecules PD DEC 6 PY 1993 VL 26 IS 25 BP 7029 EP 7036 DI 10.1021/ma00077a048 PG 8 WC Polymer Science SC Polymer Science GA ML329 UT WOS:A1993ML32900048 ER PT J AU ROLLWAGEN, FM PACHECO, ND BAQAR, S AF ROLLWAGEN, FM PACHECO, ND BAQAR, S TI AN IMPROVED MODEL FOR THE EXAMINATION OF BIOLOGICAL EFFECTS OF LOCALLY ADMINISTERED CYTOKINES SO JOURNAL OF IMMUNOLOGICAL METHODS LA English DT Article DE CYTOKINE; LOCAL PRODUCTION; IN VIVO MODEL; (MOUSE) ID COLONY-STIMULATING FACTOR; TUMOR-NECROSIS-FACTOR; RECOMBINANT INTERLEUKIN-2; CYTO-TOXICITY; KILLER-CELLS; PROLIFERATION; METASTASES; INTERFERON; SURVIVAL; DISEASE AB Cytokines incorporated into agarose blocks and implanted subcutaneously into mice establish an in vivo gradient which can be used to mimic a local inflammatory process. We have developed a model in which cellular influx into cytokine impregnated blocks parallels the normal cellular reaction to infections or wounds. Agarose blocks containing supernatants from ConA activated rat spleen cells attracted neutrophils within 4 h. These cells were followed by lymphocytes and macrophages in 24 h. Flow cytometry analysis of lymphoid cells on day 1 revealed that 38% were Ig(+) (B cell marker), 60% MAC-2,3(+) and 20% Thy 1.2(+) of which only a small fraction were expressing CD4 on their surface. These numbers changed with time following implantation of the blocks. Initially, isolated adherent cells (macrophages) were resting, with low phagocytic activity. Cells isolated from blocks at later time points were activated, as evidenced by their increased ability to ingest fluoresceinated beads. The secretion patterns of cells trafficking to murine rIL-1 containing agarose blocks were examined. TNF, IL-6 and antibody secreting cells were found. No IL-2 was detected at any time. We believe that this model will be of value in studies of local actions of cytokines. C1 GEOCENTERS INC,FT WASHINGTON,MD. RP ROLLWAGEN, FM (reprint author), USN,MED RES INST,BETHESDA,MD, USA. NR 31 TC 4 Z9 4 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0022-1759 J9 J IMMUNOL METHODS JI J. Immunol. Methods PD DEC 3 PY 1993 VL 166 IS 2 BP 223 EP 232 DI 10.1016/0022-1759(93)90363-C PG 10 WC Biochemical Research Methods; Immunology SC Biochemistry & Molecular Biology; Immunology GA MT494 UT WOS:A1993MT49400008 PM 8288876 ER PT J AU QADRI, SB SKELTON, EF SHIMKUNAS, AR BUTLER, JE AF QADRI, SB SKELTON, EF SHIMKUNAS, AR BUTLER, JE TI STRUCTURAL CHARACTERISTICS OF ELECTRON-CYCLOTRON-RESONANCE CHEMICAL-VAPOR-DEPOSITION SIC COATINGS SO SURFACE & COATINGS TECHNOLOGY LA English DT Article; Proceedings Paper CT 20th International Conference on Metallurgical Coatings and Thin Films CY APR 19-23, 1993 CL SAN DIEGO, CA ID MEMBRANES AB SiC films 0.2-2.0 mum thick have been characterized structurally by X-ray diffraction techniques. The films were deposited by electron cyclotron resonance-chemical vapor deposition techniques. No evidence of crystallinity was observed for films with thicknesses less than 1 mum; these are presumed to be amorphous. Thicker films were found to have crystallized predominantly in the a phase of SiC. RP QADRI, SB (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. RI Butler, James/B-7965-2008 OI Butler, James/0000-0002-4794-7176 NR 10 TC 0 Z9 0 U1 0 U2 0 PU ELSEVIER SCIENCE SA LAUSANNE PI LAUSANNE 1 PA PO BOX 564, 1001 LAUSANNE 1, SWITZERLAND SN 0257-8972 J9 SURF COAT TECH JI Surf. Coat. Technol. PD DEC 3 PY 1993 VL 61 IS 1-3 BP 346 EP 348 DI 10.1016/0257-8972(93)90250-R PG 3 WC Materials Science, Coatings & Films; Physics, Applied SC Materials Science; Physics GA ML848 UT WOS:A1993ML84800059 ER PT J AU RAND, SE AF RAND, SE TI RECURRENT SPONTANEOUS-ABORTION - EVALUATION AND MANAGEMENT SO AMERICAN FAMILY PHYSICIAN LA English DT Article AB Recurrent, or habitual, spontaneous abortion may be related to anatomic, genetic, infectious, immunologic, endocrine, environmental or psychologic problems. A thorough evaluation of the possible etiologies may lead to an explanation, a therapy plan and a successful pregnancy. Psychosocial support is an integral part of both evaluation and treatment. RP RAND, SE (reprint author), USN HOSP,PENSACOLA,FL, USA. NR 0 TC 2 Z9 2 U1 0 U2 0 PU AMER ACAD FAMILY PHYSICIANS PI KANSAS CITY PA 8880 WARD PARKWAY, KANSAS CITY, MO 64114-2797 SN 0002-838X J9 AM FAM PHYSICIAN JI Am. Fam. Physician PD DEC PY 1993 VL 48 IS 8 BP 1451 EP 1457 PG 7 WC Primary Health Care; Medicine, General & Internal SC General & Internal Medicine GA MK883 UT WOS:A1993MK88300020 PM 8249776 ER PT J AU BURFISHER, M ROBINSON, S THIERFELDER, K AF BURFISHER, M ROBINSON, S THIERFELDER, K TI EFFECTS OF THE GATT ON THE UNITED-STATES-MEXICO FREE-TRADE AGREEMENT SO AMERICAN JOURNAL OF AGRICULTURAL ECONOMICS LA English DT Meeting Abstract C1 UNIV CALIF BERKELEY,BERKELEY,CA 94720. USDA,ERS,WASHINGTON,DC 20250. USN ACAD,ANNAPOLIS,MD 21402. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER AGRICULTURAL ECONOMICS ASSOC PI AMES PA 1110 BUCKEYE AVE, AMES, IA 50010-8063 SN 0002-9092 J9 AM J AGR ECON JI Am. J. Agr. Econ. PD DEC PY 1993 VL 75 IS 5 BP 1308 EP 1308 PG 1 WC Agricultural Economics & Policy; Economics SC Agriculture; Business & Economics GA MW710 UT WOS:A1993MW71000196 ER PT J AU GORHAM, ED GARLAND, FC BARRETTCONNOR, E GARLAND, CF WINGARD, DL PUGH, WM AF GORHAM, ED GARLAND, FC BARRETTCONNOR, E GARLAND, CF WINGARD, DL PUGH, WM TI INCIDENCE OF INSULIN-DEPENDENT DIABETES-MELLITUS IN YOUNG-ADULTS - EXPERIENCE OF 1,587,630 US-NAVY ENLISTED PERSONNEL SO AMERICAN JOURNAL OF EPIDEMIOLOGY LA English DT Note DE DIABETES MELLITUS; INSULIN-DEPENDENT; INCIDENCE; PROSPECTIVE STUDIES ID UNITED-STATES-NAVY AB First hospitalizations (n = 1,293) for diabetes mellitus between 1974 and 1988 were used as a surrogate for insulin-dependent diabetes mellitus incidence among 17-34-year-old US Navy enlisted personnel followed for 6,077,856 person-years. In the 15-year period, the overall incidence of insulin-dependent diabetes mellitus was 21.3 per 100,000 person-years. Incidence did not differ significantly by sex, but was higher for blacks than whites (28.4 vs. 20.2 per 100,000 person-years, respectively; p < 0.05). Incidence increased with age threefold for white men and fivefold for black men (p < 0.05) between the ages of 17-19 and 30-34 years. C1 UNIV CALIF SAN DIEGO,SCH MED,DEPT FAMILY & PREVENT MED,SAN DIEGO,CA. USN,HLTH RES CTR,MED SYST & OPERAT RES DEPT,SAN DIEGO,CA. RP GORHAM, ED (reprint author), USN,HLTH RES CTR,DEPT HLTH SCI & EPIDEMIOL,DIV EPIDEMIOL,POB 85122,SAN DIEGO,CA 92186, USA. NR 13 TC 14 Z9 14 U1 0 U2 0 PU JOHNS HOPKINS UNIV SCHOOL HYGIENE PUB HEALTH PI BALTIMORE PA 111 MARKET PLACE, STE 840, BALTIMORE, MD 21202-6709 SN 0002-9262 J9 AM J EPIDEMIOL JI Am. J. Epidemiol. PD DEC 1 PY 1993 VL 138 IS 11 BP 984 EP 987 PG 4 WC Public, Environmental & Occupational Health SC Public, Environmental & Occupational Health GA ML879 UT WOS:A1993ML87900007 PM 8256783 ER PT J AU LILLEY, LL SCOTT, HB AF LILLEY, LL SCOTT, HB TI WHAT YOU NEED TO KNOW ABOUT - TAXOL SO AMERICAN JOURNAL OF NURSING LA English DT Article ID AGENT C1 USN,MED CTR,CHEMOTHERAPY UNIT,PORTSMOUTH,VA 23708. RP LILLEY, LL (reprint author), OLD DOMINION UNIV,NORFOLK,VA 23508, USA. NR 8 TC 3 Z9 3 U1 0 U2 0 PU LIPPINCOTT-RAVEN PUBL PI PHILADELPHIA PA 227 EAST WASHINGTON SQ, PHILADELPHIA, PA 19106 SN 0002-936X J9 AM J NURS JI Am. J. Nurs. PD DEC PY 1993 VL 93 IS 12 BP 46 EP 50 PG 5 WC Nursing SC Nursing GA MK041 UT WOS:A1993MK04100021 PM 7905707 ER PT J AU GILLESPIE, DT AF GILLESPIE, DT TI FLUCTUATION AND DISSIPATION IN BROWNIAN-MOTION SO AMERICAN JOURNAL OF PHYSICS LA English DT Article AB An analysis of Brownian motion based upon a ''Langevin equation'' form of Newton's second law provides a physically motivated introduction to the theory of continuous Markov processes, which in turn illuminates the subtle mathematical underpinnings of the Langevin equation. But the Langevin approach to Brownian motion requires one to assume that the collisional forces of the bath molecules on the Brownian particle artfully resolve themselves into a ''dissipative drag'' component and a ''zero-mean fluctuating'' component. A physically more plausible approach is provided by a simple discrete-state jump Markov process that models in a highly idealized way the immediate effects of individual molecular collisions on the velocity of the Brownian particle. The predictions of this jump Markov process model in the continuum limit are found to precisely duplicate the predictions of the Langevin equation, thereby validating the critical two-force assumption of the Langevin approach. RP GILLESPIE, DT (reprint author), USN,CTR AIR WARFARE,RES DEPT,CHINA LAKE,CA 93555, USA. NR 4 TC 21 Z9 21 U1 0 U2 12 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0002-9505 J9 AM J PHYS JI Am. J. Phys. PD DEC PY 1993 VL 61 IS 12 BP 1077 EP 1083 DI 10.1119/1.17354 PG 7 WC Education, Scientific Disciplines; Physics, Multidisciplinary SC Education & Educational Research; Physics GA MK231 UT WOS:A1993MK23100003 ER PT J AU STRUEWING, JP HYAMS, KC TUELLER, JE GRAY, GC AF STRUEWING, JP HYAMS, KC TUELLER, JE GRAY, GC TI THE RISK OF MEASLES, MUMPS, AND VARICELLA AMONG YOUNG-ADULTS - A SEROSURVEY OF UNITED-STATES-NAVY AND MARINE CORPS RECRUITS SO AMERICAN JOURNAL OF PUBLIC HEALTH LA English DT Article ID LINKED IMMUNOSORBENT-ASSAY; IMMUNE STATUS; ZOSTER VIRUS; ENZYME-IMMUNOASSAY; EPIDEMIC MEASLES; ARMY RECRUITS; SUSCEPTIBILITY; INFECTIONS; NEUTRALIZATION; OUTBREAKS AB Objectives. To assess the risk of epidemic transmission and to guide immunization policy, the seroprevalence of antibody to measles, mumps, and varicella was determined in a group of young adults. Methods. A cross-sectional study of 1533 US Navy and Marine Corps recruits was conducted in June 1989. Antibody status was determined with commercially available enzyme-linked immunosorbent assays. Results. Direct sex and race adjustment to the 15- to 29-year-old US population resulted in seronegativity rates of 17.8% for measles, 12.3% for mumps, and 6.7% for varicella. Measles and mumps seronegativity rates were higher among Whites whereas varicella seronegativity was higher among non-Whites. Recruits enlisting from outside the 50 US states, especially those from island territories, were more likely to lack varicella antibody. The sensitivity of a positive history of vaccination or disease in predicting antibody status was less than 90% for all diseases. Conclusions. These results suggest a continued potential for epidemics, especially of measles, and the need for mandatory immunization policies. Immigrants to the United States, especially those from island territories, may be a high-risk group that could benefit from varicella vaccination. C1 USN,MED RES INST,DIV EPIDEMIOL,BETHESDA,MD 20814. USN,ENVIRONM & PREVENT MED UNIT 5,SAN DIEGO,CA 92132. RI Struewing, Jeffery/C-3221-2008; Struewing, Jeffery/I-7502-2013 OI Struewing, Jeffery/0000-0002-4848-3334 NR 42 TC 80 Z9 82 U1 0 U2 2 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 DEC PY 1993 VL 83 IS 12 BP 1717 EP 1720 DI 10.2105/AJPH.83.12.1717 PG 4 WC Public, Environmental & Occupational Health SC Public, Environmental & Occupational Health GA MM041 UT WOS:A1993MM04100015 PM 8259801 ER PT J AU BAIRD, JK PURNOMO BASRI, H BANGS, MJ ANDERSEN, EM JONES, TR MASBAR, S HARJOSUWARNO, S SUBIANTO, B ARBANI, PR AF BAIRD, JK PURNOMO BASRI, H BANGS, MJ ANDERSEN, EM JONES, TR MASBAR, S HARJOSUWARNO, S SUBIANTO, B ARBANI, PR TI AGE-SPECIFIC PREVALENCE OF PLASMODIUM-FALCIPARUM AMONG 6 POPULATIONS WITH LIMITED HISTORIES OF EXPOSURE TO ENDEMIC MALARIA SO AMERICAN JOURNAL OF TROPICAL MEDICINE AND HYGIENE LA English DT Article ID IRIAN-JAYA; INDUCED PROLIFERATION; THYMIC INVOLUTION; COMPLEX DIPTERA; IL-2 RECEPTORS; AGING MICE; T-CELLS; LYMPHOCYTES; RESISTANCE; INDONESIA AB The age-specific prevalence of Plasmodium falciparum parasitemia among residents of six villages in northeastern Irian Jaya, Indonesia, has been measured for a period of five years. All study subjects were transmigrants from Java living in Irian Jaya for three weeks to 72 months, depending upon the village and point of measurement. Fifteen separate estimates of prevalence were obtained from 4,554 Giemsa-stained thick blood films from 91 to 701 people (mean sample size = 304) among the six villages. The prevalence of parasitemia among people who had lived in Irian Jaya for less than one year did not decrease as a function of age, except in one village at eight months. In contrast, after 16 months to two years or more of residence, the prevalence of parasitemia decreased markedly with increasing age beyond 6-10 or 11-15 years. Social, behavioral, or entomologic characteristics of these populations did not explain the decreasing prevalence of parasitemia with age. An age-dependent naturally acquired protective immunity appeared to develop in all of these villages after 1-2 years of exposure to hyperendemic malaria. C1 USN,MED RES INST,ROCKVILLE,MD. PROVINCIAL HLTH SERV,IRIAN JAYA,INDONESIA. MINIST HLTH,MALARIA SUBDIRECTORATE,JAKARTA,INDONESIA. RP BAIRD, JK (reprint author), USN,MED RES UNIT 2,JAKARTA,INDONESIA. NR 60 TC 64 Z9 65 U1 0 U2 0 PU AMER SOC TROP MED & HYGIENE PI MCLEAN PA 8000 WESTPARK DRIVE SUITE 130, MCLEAN, VA 22101 SN 0002-9637 J9 AM J TROP MED HYG JI Am. J. Trop. Med. Hyg. PD DEC PY 1993 VL 49 IS 6 BP 707 EP 719 PG 13 WC Public, Environmental & Occupational Health; Tropical Medicine SC Public, Environmental & Occupational Health; Tropical Medicine GA MR261 UT WOS:A1993MR26100008 PM 8279639 ER PT J AU JASON, PK AF JASON, PK TI IMAGINING PARIS - EXILE, WRITING AND AMERICAN IDENTITY - KENNEDY,JG SO AMERICAN LITERATURE LA English DT Book Review RP JASON, PK (reprint author), USN ACAD,ANNAPOLIS,MD 21402, USA. NR 1 TC 0 Z9 0 U1 0 U2 0 PU DUKE UNIV PRESS PI DURHAM PA BOX 90660, DURHAM, NC 27708-0660 SN 0002-9831 J9 AM LIT JI Am. Lit. PD DEC PY 1993 VL 65 IS 4 BP 804 EP 805 DI 10.2307/2927317 PG 2 WC Literature, American SC Literature GA ML009 UT WOS:A1993ML00900032 ER PT J AU HARROD, FS AF HARROD, FS TI NEW TECHNOLOGY IN THE OLD NAVY - THE UNITED-STATES-NAVY DURING THE 1870S SO AMERICAN NEPTUNE LA English DT Article RP HARROD, FS (reprint author), USN ACAD,ANNAPOLIS,MD 21402, USA. NR 53 TC 1 Z9 1 U1 1 U2 1 PU PEABODY MUSEUM PI SALEM PA E INDIA MARINE HALL, SALEM, MA 01970 SN 0003-0155 J9 AM NEPTUNE JI Am. Neptune PD WIN PY 1993 VL 53 IS 1 BP 5 EP 19 PG 15 WC History SC History GA KP180 UT WOS:A1993KP18000001 ER PT J AU BAQAR, S PACHECO, ND ROLLWAGEN, FM AF BAQAR, S PACHECO, ND ROLLWAGEN, FM TI MODULATION OF MUCOSAL IMMUNITY AGAINST CAMPYLOBACTER-JEJUNI BY ORALLY-ADMINISTERED CYTOKINES SO ANTIMICROBIAL AGENTS AND CHEMOTHERAPY LA English DT Article ID MYCOBACTERIUM-AVIUM COMPLEX; TUMOR NECROSIS FACTOR; NATURAL-KILLER CELLS; RECOMBINANT INTERLEUKIN-6; PROTECTS MICE; INFECTION; INTERFERON; NEUTROPHILS; MODEL; SERUM AB The effect of oral recombinant interleukin (rIL) treatment on the course of Campylobacter jejuni infection and the development of mucosal immunity in mice was investigated. rIL-2, rIL-5, and rIL-6 were administered to mice at 24 and 6 h before infection and at 0, 24, and 48 h after infection with C. jejuni HC, and the subsequent development of an immune response and intestinal colonization resistance were determined. In this model, orally administered cytokines retained their biological activities with no apparent side effects. Following infection, initial bacterial counts in fecal samples collected from cytokine-treated and untreated mice were similar. However, within 48 h of infection a greater than 3-log unit reduction in the number of C. jejuni shed in the feces was found for rIL-6-treated animals. Colonization levels were similarly reduced in rIL-5-treated mice, although the rate of clearance was somewhat slower. In contrast, rIL-2 treatment had no significant effect on colonization levels compared with that in controls. Oral rIL-6 treatment was also associated with enhanced intestinal and systemic Campylobacter-specific immunoglobulin A responses compared with those observed in either rIL-5- or rIL-2-treated animals. Upon rechallenge, initial colonization in all cytokine-treated groups was approximately 2 log units lower than that in controls. However, local infection was controlled only in rIL-2-treated mice over time. rIL-5 and rIL-6 treatment had only a marginal effect on colonization resistance following rechallenge. On the basis of these results, it appears that rIL-2 and rIL-5 or rIL-6 may function to modulate the induction and/or expression of anti-C. jejuni immunity through different mechanisms. C1 USN,MED RES INST,DIV WOUND REPAIR ENHANCEMENT,BETHESDA,MD 20889. RP BAQAR, S (reprint author), USN,MED RES INST,DIV ENTER DIS,BETHESDA,MD 20889, USA. NR 33 TC 36 Z9 38 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 DEC PY 1993 VL 37 IS 12 BP 2688 EP 2692 PG 5 WC Microbiology; Pharmacology & Pharmacy SC Microbiology; Pharmacology & Pharmacy GA MK853 UT WOS:A1993MK85300031 PM 8109936 ER PT J AU OYOFO, BA ROLLINS, DM AF OYOFO, BA ROLLINS, DM TI EFFICACY OF FILTER TYPES FOR DETECTING CAMPYLOBACTER-JEJUNI AND CAMPYLOBACTER-COLI IN ENVIRONMENTAL WATER SAMPLES BY POLYMERASE CHAIN-REACTION SO APPLIED AND ENVIRONMENTAL MICROBIOLOGY LA English DT Article ID FLAGELLIN GENES; MICROORGANISMS; PROBES AB A previously developed polymerase chain reaction (PCR) amplification of a target region in the flaA Campylobacter flagellin gene was evaluated and adapted for use with environmental water samples. The ability to detect Campylobacter jejuni or Campylobacter coli in seeded water samples was tested with various filters after concentration and freeze-thaw lysis of the bacterial cells. A nonradioactive probe for the amplified flagellin gene fragment detected as little as 1 to 10 fg of genomic DNA and as few as 10 to 100 viable C. jejuni cells per 100 ml of water filtered onto Fluoropore (Millipore Corp.) filters. No amplification was obtained with cellulose acetate filters, most likely because of binding of the DNA to the filter. Concentration and lysis of target cells on Fluoropore and Durapore (Millipore Corp.) filters allowed PCR to be performed in the same reaction tube without removing the filters. This methodology was then adapted for use with environmental water samples. The water supply to a broiler chicken production farm was suspected as the source of C. jejuni known to be endemic in grow-out flocks at the farm, despite the inability to culture the organisms by standard methods. The filtration-PCR method detected Campylobacter DNA in more than half of the farm water samples examined. Amplified campylobacter DNA was not detected in small volumes of regional surface water samples collected on a single occasion in February. The filtration-PCR amplification method provided a basis for detection of C. jejuni and C. coli in environmental waters with a high degree of specificity and sensitivity. C1 USN,MED RES INST,DEPT INFECT DIS,ENTER DIS PROGRAM,BETHESDA,MD 20889. NR 37 TC 60 Z9 60 U1 0 U2 2 PU AMER SOC MICROBIOLOGY PI WASHINGTON PA 1325 MASSACHUSETTS AVENUE, NW, WASHINGTON, DC 20005-4171 SN 0099-2240 J9 APPL ENVIRON MICROB JI Appl. Environ. Microbiol. PD DEC PY 1993 VL 59 IS 12 BP 4090 EP 4095 PG 6 WC Biotechnology & Applied Microbiology; Microbiology SC Biotechnology & Applied Microbiology; Microbiology GA MK854 UT WOS:A1993MK85400016 PM 8285708 ER PT J AU KASSIM, NE PERLEY, RA ERICKSON, WC DWARAKANATH, KS AF KASSIM, NE PERLEY, RA ERICKSON, WC DWARAKANATH, KS TI SUBARCMINUTE RESOLUTION IMAGING OF RADIO-SOURCES AT 74 MHZ WITH THE VERY LARGE ARRAY SO ASTRONOMICAL JOURNAL LA English DT Article ID RADIOTELESCOPE AB A new observing system operating at 74 MHz and providing an angular resolution of 20'' is currently being tested at the VLA. The system comprises a prime-focus dipole feed and amplifier installed on eight of the VLA's 25 m antennas. Although the system is of low efficiency, it works well for imaging strong sources (S approximately greater-than-or-equal-to 200 Jy) on long baselines ( > 5 km) since self-calibration has sufficient signal to noise to remove phase errors on the short time scales (approximately 10 s) characteristic of ionospheric variations. We present maps of a few strong, well known radio sources imaged in most cases with unprecedented angular resolution. For weaker sources, the ionospheric phase variations do not allow the increased integration times required for successful self-calibration. In order to overcome this, we have developed a procedure of dual-frequency ionospheric phase referencing utilizing simultaneous observations at 74 and 330 MHz to ''unwind'' the effects of the ionosphere before self-calibration. We will discuss the procedure, which should be applicable to any future low frequency ( < 100 MHz), long baseline ( > 5 km), ground-based interferometer which can obtain simultaneous, higher frequency measurements, and show examples of its application. C1 NATL RADIO ASTRON OBSERV,SOCORRO,NM 87801. UNIV TASMANIA,DEPT PHYS,HOBART,TAS 7001,AUSTRALIA. RP KASSIM, NE (reprint author), USN,DIV REMOTE SENSING,RES LAB,CODE 7215,WASHINGTON,DC 20375, USA. RI Dwarakanath, K /D-4876-2012; Astronomy & Astrophysics Group, Raman Res Institute/D-4046-2012 NR 25 TC 65 Z9 66 U1 0 U2 2 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 DEC PY 1993 VL 106 IS 6 BP 2218 EP 2228 DI 10.1086/116795 PG 11 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA MK862 UT WOS:A1993MK86200003 ER PT J AU ELLIOT, JL BOSH, AS COOKE, ML BLESS, RC NELSON, MJ PERCIVAL, JW TAYLOR, MJ DOLAN, JF ROBINSON, EL VANCITTERS, GW AF ELLIOT, JL BOSH, AS COOKE, ML BLESS, RC NELSON, MJ PERCIVAL, JW TAYLOR, MJ DOLAN, JF ROBINSON, EL VANCITTERS, GW TI AN OCCULTATION BY SATURNS RINGS ON 1991 OCTOBER 2-3 OBSERVED WITH THE HUBBLE-SPACE-TELESCOPE SO ASTRONOMICAL JOURNAL LA English DT Article ID RADIO OCCULTATION; RESONANCE STRUCTURES; URANIAN RINGS; CANDIDATES; PERFORMANCE; PHOTOMETER; URANUS; PLUTO; IUE AB An occultation of the star GSC 6323-01396 (V = 11.9) by Saturn's rings was observed with the High-Speed Photometer on the Hubble Space Telescope (HST) on 1991 October 2-3. This occultation occurred when Saturn was near a stationary point, so the apparent motion of Saturn relative to the star was dominated by the HST orbital motion (8 km s-1). Data were recorded simultaneously at effective wavelengths of 3200 and 7500 angstrom, with an integration time of 0.15 s. Observations were interrupted by passages of the spacecraft behind the Earth and through the South Atlantic Anomaly. Fifteen segments of occultation data, totaling 6.8 h, were recorded in 13 successive orbits during the 20.0 h interval from UTC 1991 October 2, 19:35 until UTC 1991 October 3, 15:35. Occultations by 43 different features throughout the classical rings were unambiguously identified in the light curve, with a second occultation by 24 of them occurring due to spacecraft orbital parallax during this extremely slow event. Occultation times for features currently presumed circular were measured and employed in a geometrical model for the rings. This model, relating the observed occultation times to feature radii and longitudes, is presented here and is used in a least-squares fit for the pole direction and radius scale of Saturn's ring system. Combined fits with the HST occultation times and 28 Sgr occultation times [French et al., Icarus, 103, 163 (1993) and Hubbard et al., Icarus, 103, 215 (1993)] yield a ring-pole direction of alpha = 40.5929-degrees +/- 0.0151 and delta = 83.5348-degrees +/- 0.0053-degrees (J2000.0, at the Voyager 1 epoch of UTC 1980 Nov. 12 23:46:32). This result, independent of Voyager data and its associated trajectory errors, is compared with other recent determinations of the pole and radius scale. C1 LOWELL OBSERV,FLAGSTAFF,AZ 86001. MIT,DEPT PHYS,CAMBRIDGE,MA 02139. UNIV WISCONSIN,SPACE ASTRON LAB,MADISON,WI 53706. NASA,GODDARD SPACE FLIGHT CTR,ASTRON & SOLAR PHYS LAB,GREENBELT,MD 20771. UNIV TEXAS,DEPT ASTRON,AUSTIN,TX 78712. NATL SCI FDN,DIV ASTRON SCI,WASHINGTON,DC 20550. USN ACAD,DEPT AEROSP ENGN,ANNAPOLIS,MD 21402. RP ELLIOT, JL (reprint author), MIT,DEPT EARTH ATMOSPHER & PLANETARY SCI,CAMBRIDGE,MA 02139, USA. NR 54 TC 24 Z9 24 U1 0 U2 0 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0004-6256 J9 ASTRON J JI Astron. J. PD DEC PY 1993 VL 106 IS 6 BP 2544 EP 2572 DI 10.1086/116824 PG 29 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA MK862 UT WOS:A1993MK86200032 ER PT J AU GARREN, D CHEN, J CARGILL, P AF GARREN, D CHEN, J CARGILL, P TI EQUILIBRIUM MORPHOLOGY OF SLENDER UNTWISTED FLUX LOOPS SO ASTROPHYSICAL JOURNAL LA English DT Article DE MHD; SUN, CORONA ID INHOMOGENEOUS MAGNETIC-FIELDS; FIBRIL STRUCTURE; SOLAR PROMINENCES; CONVECTION ZONE; CORONAL LOOPS; TUBES; MODEL; INSTABILITY; DISSIPATION; ATMOSPHERE AB The morphology of untwisted magnetic flux loops in equilibrium with an ambient plasma and loop-aligned magnetic field is analyzed using magnetohydrodynamics (MHD). The temperature inside the loop is assumed to be uniform, but is permitted to be different from the uniform ambient temperature. Two classes of loops are shown to exist: (1) those with legs descending monotonically in the direction of the gravity, and (2) those which are spatially periodic. The latter form a distinct class of solutions that exist only for unequal loop and ambient temperatures. Physical implications are discussed in connection with possible solar loops. RP GARREN, D (reprint author), USN, RES LAB, DIV PLASMA PHYS, BEAM PHYS BRANCH, WASHINGTON, DC 20375 USA. NR 35 TC 2 Z9 2 U1 0 U2 0 PU IOP PUBLISHING LTD PI BRISTOL PA DIRAC HOUSE, TEMPLE BACK, BRISTOL BS1 6BE, ENGLAND SN 0004-637X J9 ASTROPHYS J JI Astrophys. J. PD DEC 1 PY 1993 VL 418 IS 2 BP 919 EP 927 DI 10.1086/173449 PN 1 PG 9 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA MJ035 UT WOS:A1993MJ03500035 ER PT J AU MARTINPINTADO, J GAUME, R BACHILLER, R JOHNSTON, K PLANESAS, P AF MARTINPINTADO, J GAUME, R BACHILLER, R JOHNSTON, K PLANESAS, P TI STIMULATED RATIO RECOMBINATION LINE EMISSION AT 13 CENTIMETERS TOWARD MWC 349 SO ASTROPHYSICAL JOURNAL LA English DT Article DE ISM, H-II REGIONS; MASERS; STARS, CIRCUMSTELLAR MATTER; STARS, INDIVIDUAL (MWC 349) ID MWC-349; ENVELOPES; MASER; STAR AB High angular resolution (0.''065) observations of the H66alpha recombination line and continuum emission at 22.4 GHz toward the ionized wind in MWC 349 are presented. The continuum emission shows that the neutral material around the central star is distributed in a torus with a thickness of approximately 80 AU and an inner radius of approximately 100 AU. The H66alpha integrated line intensities are larger, by a factor of approximately 5, than the expected spontaneous emission. Thus, we suggest that stimulated emission makes a significant contribution to the observed line intensities. We present a radiative transfer model in which the asymmetric shape of the measured profiles and the spatial distribution of the H66alpha line are explained by radiative transfer models for a bipolar ionized wind expanding at constant velocity when non-LTE effects are taken into account. The non-LTE model products line intensities which are within a factor of approximately 1.4 of the observed intensities. The discrepancies between the non-LTE predictions and the observations are probably due to the presence of density and temperature inhomogeneities in the wind and/or uncertainties in the LTE departure coefficients used in our calculations. The origin of the centimeter recombination line emission in MWC 349 is briefly discussed. It is suggested that the intensity and the spatial distribution of recombination line emission can be used to show the presence of ionized bipolar outflows confined by neutral disks. C1 USN,RES LAB,DIV REMOTE SENSING,WASHINGTON,DC 20375. RP MARTINPINTADO, J (reprint author), CTR ASTRON YEBES,IGN,APARTADO 148,E-19080 GUADALAJARA,SPAIN. RI Planesas, Pere/G-7950-2015; Martin-Pintado, Jesus/H-6107-2015 OI Planesas, Pere/0000-0002-7808-3040; Martin-Pintado, Jesus/0000-0003-4561-3508 NR 29 TC 15 Z9 15 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 DEC 1 PY 1993 VL 418 IS 2 BP L79 EP L82 DI 10.1086/187121 PN 2 PG 4 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA MJ036 UT WOS:A1993MJ03600007 ER PT J AU SCHMIDT, EG CARRUTHERS, GR AF SCHMIDT, EG CARRUTHERS, GR TI FAR-ULTRAVIOLET STELLAR PHOTOMETRY - A FIELD IN ORION SO ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES LA English DT Article DE OPEN CLUSTERS AND ASSOCIATIONS, INDIVIDUAL (ORION ASSOCIATION); STARS, EARLY-TYPE; SURVEYS; TECHNIQUES, PHOTOMETRIC; ULTRAVIOLET, STARS; WHITE DWARFS ID IMAGING SURVEY AB Far-ultraviolet photometry for 625 objects in Orion is presented. These data were extracted from electrographic camera images obtained during sounding rocket flights in 1975 and 1982. The 1975 images were centered close to the belt of Orion while the 1982 images were centered approximately 9-degrees further north. One hundred and fifty stars fell in the overlapping region and were observed with both cameras. Sixty-eight percent of the objects were tentatively identified with known stars using the SIMBAD database while another 24% are blends of objects too close together to separate with our resolution. As in previous studies, the majority of the identified ultraviolet sources are early-type stars. However, there are a significant number for which no such identification was possible, and we suggest that these are interesting objects which should be further investigated. Seven stars were found which were bright in the ultraviolet but faint in the visible. We suggest that some of these are nearby white dwarfs. RP SCHMIDT, EG (reprint author), USN,RES LAB,EO HULBURT CTR SPACE RES,CODE 7604,WASHINGTON,DC 20375, USA. NR 10 TC 8 Z9 8 U1 0 U2 0 PU UNIV CHICAGO PRESS PI CHICAGO PA 5720 S WOODLAWN AVE, CHICAGO, IL 60637 SN 0067-0049 J9 ASTROPHYS J SUPPL S JI Astrophys. J. Suppl. Ser. PD DEC PY 1993 VL 89 IS 2 BP 259 EP 270 DI 10.1086/191847 PG 12 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA MG688 UT WOS:A1993MG68800001 ER PT J AU ISRAEL, DJ WITTMERS, LE HOFFMAN, RG POZOS, RS AF ISRAEL, DJ WITTMERS, LE HOFFMAN, RG POZOS, RS TI SUPPRESSION OF SHIVERING BY BREATH-HOLDING, RELAXATION, MENTAL ARITHMETIC, AND WARM WATER INGESTION SO AVIATION SPACE AND ENVIRONMENTAL MEDICINE LA English DT Article ID TEMPERATURE; INHIBITION AB Four methods of suppressing cold-induced shivering were evaluated in 26 young male volunteers exposed to 0.0 +/- 1.0 degrees C air for 135 min. Voluntary relaxation of musculature (R), breath holding (BH), warm (50 degrees C) water ingestion (W), and performance of a mental arithmetic task (MA) were applied in ct counterbalanced order following 2 h of cold exposure. Surface electromyograms of seven muscles were recorded and converted to root mean square voltage (RMS) as a measure of shivering intensity. Mean skin and rectal temperatures decreased significantly, 4.9 degrees C and 0.3 degrees C, respectively (p less than or equal to 0.01). Mean reduction of EMG activity wets 35% during R, 24% during BH, 18% during MA, and 5% during W. R was significantly more effective than BH, MA, and W, and BH and MA were significantly more effective than W in reducing shivering. These results indicate that, at small decreases in rectal temperature, shivering can be voluntarily suppressed to some extent during relaxation, breath holding, and mental arithmetic, C1 UNIV MINNESOTA,SCH MED,DEPT BEHAV SCI,DULUTH,MN. USN,CTR HLTH RES,SAN DIEGO,CA. RP ISRAEL, DJ (reprint author), UNIV MINNESOTA,SCH MED 359,DEPT MED & MOLEC PHYSIOL,HYPOTHERMIA & AQUAT SAFETY LAB,10 UNIV DR,DULUTH,MN 55812, USA. NR 27 TC 3 Z9 3 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 DEC PY 1993 VL 64 IS 12 BP 1108 EP 1112 PG 5 WC Public, Environmental & Occupational Health; Medicine, General & Internal; Sport Sciences SC Public, Environmental & Occupational Health; General & Internal Medicine; Sport Sciences GA MK441 UT WOS:A1993MK44100005 PM 8291990 ER PT J AU LUM, LG JOSHI, ID GALOFORO, SC ABELLA, E KARANES, C RATANATHARATHORN, V SCHULTZ, KR UBERTI, JP SENSENBRENNER, LL LEDBETTER, JA JUNE, CH AF LUM, LG JOSHI, ID GALOFORO, SC ABELLA, E KARANES, C RATANATHARATHORN, V SCHULTZ, KR UBERTI, JP SENSENBRENNER, LL LEDBETTER, JA JUNE, CH TI COACTIVATION WITH ANTI-CD28 MONOCLONAL-ANTIBODY ENHANCES ANTI-CD3 MONOCLONAL ANTIBODY-INDUCED PROLIFERATION AND IL-2 SYNTHESIS IN T-CELLS FROM AUTOLOGOUS BONE-MARROW TRANSPLANT RECIPIENTS SO BONE MARROW TRANSPLANTATION LA English DT Article ID DEFECTIVE INTERLEUKIN-2 PRODUCTION; HUMAN LYMPHOCYTES-T; IMMUNOGLOBULIN-SYNTHESIS; CHRONIC GRAFT; HOST-DISEASE; DIFFERENTIATIVE RESPONSES; INVITRO REGULATION; RECEPTOR COMPLEX; ACTIVATION; PATHWAY AB Recent studies show that costimulation of T cells with anti-CD28 Mab (anti CD28) enhances anti-CD3 Mab (anti-CD3)-induced proliferative responses and cytokine production. This study determines if coactivation with anti-CD3 and anti-CD28 corrects defects in proliferation and IL-2 secretion in peripheral blood lymphocytes (PBL) from bone marrow transplant (BMT) recipients. PBL or T cells from 5 of 16 autologous and 5 of 22 allogeneic recipients increased their anti-CD3-induced proliferation responses by > 50% after coactivation. In short-term (<180 days after BMT) autologous recipients, the group mean response increased after anti-CD3 activation from 62 900 to 97 800 cpm after coactivation. In long-term (>180 day after BMT) autologous recipients, the group mean response after anti-CD3 activation increased from 62 600 to 78 400 cpm after coactivation. The long-term autologous recipient group had costimulated responses from PBL that were significantly higher than the paired anti-CD3-induced responses (p < 0.01); in contrast, such differences were not seen in allogeneic recipient groups. After anti-CD3 stimulation, the mean response of 88 000 cpm for PBL from short-term allogeneic recipients and the mean response of 83 600 cpm for PBL from long-term allogeneic recipients were higher than those in PBL from autologous recipient groups. The amount of IL-2 secreted by T cells from three autologous and three allogeneic recipients was enhanced 0.9-25-fold by coactivation. Coactivation of PBL from selected recipients increased proliferation into the normal range and increased IL-2 secretion. Stimulation of the CD28 pathway may be useful in strategies to enhance immune responses after autologous BMT. C1 WAYNE STATE UNIV,DEPT MED,DIV HEMATOL & ONCOL,BONE MARROW TRANSPLANTAT PROGRAM,DETROIT,MI 48202. WAYNE STATE UNIV,DEPT PEDIAT,DETROIT,MI 48202. BRISTOL MEYER SQUIBB,SEATTLE,WA. USN,MED RES INST,BETHESDA,MD. NR 35 TC 7 Z9 7 U1 0 U2 1 PU STOCKTON PRESS PI BASINGSTOKE PA HOUNDMILLS, BASINGSTOKE, HAMPSHIRE, ENGLAND RG21 6XS SN 0268-3369 J9 BONE MARROW TRANSPL JI Bone Marrow Transplant. PD DEC PY 1993 VL 12 IS 6 BP 565 EP 571 PG 7 WC Biophysics; Oncology; Hematology; Immunology; Transplantation SC Biophysics; Oncology; Hematology; Immunology; Transplantation GA MP349 UT WOS:A1993MP34900002 PM 8136739 ER PT J AU BARHAM, WB CHURCH, P BROWN, JE PAPARELLO, S AF BARHAM, WB CHURCH, P BROWN, JE PAPARELLO, S TI MISIDENTIFICATION OF BRUCELLA SPECIES WITH USE OF RAPID BACTERIAL IDENTIFICATION SYSTEMS SO CLINICAL INFECTIOUS DISEASES LA English DT Letter RP BARHAM, WB (reprint author), USN,NATL MED CTR,DIV INFECT DIS,MED CORPS,8901 WISCONSIN AVE,BETHESDA,MD 20889, USA. NR 4 TC 26 Z9 26 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 DEC PY 1993 VL 17 IS 6 BP 1068 EP 1069 PG 2 WC Immunology; Infectious Diseases; Microbiology SC Immunology; Infectious Diseases; Microbiology GA ML918 UT WOS:A1993ML91800025 PM 8110938 ER PT J AU WALLACE, MR NGUYEN, MT NEWTON, JA AF WALLACE, MR NGUYEN, MT NEWTON, JA TI USE OF PAROMOMYCIN FOR THE TREATMENT OF CRYPTOSPORIDIOSIS IN PATIENTS WITH AIDS SO CLINICAL INFECTIOUS DISEASES LA English DT Letter C1 USN HOSP,DEPT INTERNAL MED,DIV INFECT DIS,SAN DIEGO,CA 92134. USN HOSP,DEPT PHARM,SAN DIEGO,CA 92134. RP WALLACE, MR (reprint author), USN HOSP,DEPT CLIN INVEST,SAN DIEGO,CA 92134, USA. NR 3 TC 18 Z9 19 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 DEC PY 1993 VL 17 IS 6 BP 1070 EP 1071 PG 2 WC Immunology; Infectious Diseases; Microbiology SC Immunology; Infectious Diseases; Microbiology GA ML918 UT WOS:A1993ML91800027 PM 8161375 ER PT J AU NEWTON, JA KENNEDY, CA AF NEWTON, JA KENNEDY, CA TI WOUND-INFECTION DUE TO AEROMONAS-SOBRIA SO CLINICAL INFECTIOUS DISEASES LA English DT Letter C1 USN HOSP,DEPT CLIN INVEST,SAN DIEGO,CA 92134. USN HOSP,DEPT INTERNAL MED,DIV INFECT DIS,SAN DIEGO,CA 92134. NR 6 TC 6 Z9 6 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 DEC PY 1993 VL 17 IS 6 BP 1082 EP 1083 PG 2 WC Immunology; Infectious Diseases; Microbiology SC Immunology; Infectious Diseases; Microbiology GA ML918 UT WOS:A1993ML91800039 PM 8110950 ER PT J AU JENSEN, KL GANGULY, AK AF JENSEN, KL GANGULY, AK TI SIMULATION OF FIELD-EMISSION FROM SILICON - SELF-CONSISTENT CORRECTIONS USING THE WIGNER DISTRIBUTION FUNCTION SO COMPEL-THE INTERNATIONAL JOURNAL FOR COMPUTATION AND MATHEMATICS IN ELECTRICAL AND ELECTRONIC ENGINEERING LA English DT Article; Proceedings Paper CT 9th International Conference on the Numerical Analysis of Semiconductor Devices and Integrated Circuits (NASECODE IX) CY APR 06-08, 1993 CL COPPER MT, CO ID NUMERICAL-SIMULATION; TUNNELING STRUCTURES AB In this work we outline the methodology by which the Wigner Distribution Function (WDF) may be applied to the simulation of field emission from silicon into the vacuum so that the effects of self-consistently calculated band bending and scattering on the current-field characteristics may be assessed. For the first time, current saturation-like effects are simulated. We analyze this in light of the behavior of the self-consistent potential and density profiles at high applied fields. C1 USN,RES LAB,ESTD,WASHINGTON,DC 20375. RI Jensen, Kevin/I-1269-2015 OI Jensen, Kevin/0000-0001-8644-1680 NR 10 TC 1 Z9 1 U1 0 U2 1 PU MCB UNIV PRESS LTD PI BRADFORD PA 60/62 TOLLER LANE, BRADFORD, W YORKSHIRE, ENGLAND BD8 9BY SN 0332-1649 J9 COMPEL JI Compel-Int. J. Comp. Math. Electr. Electron. Eng. PD DEC PY 1993 VL 12 IS 4 BP 507 EP 515 DI 10.1108/eb051823 PG 9 WC Computer Science, Interdisciplinary Applications; Engineering, Electrical & Electronic; Mathematics, Applied SC Computer Science; Engineering; Mathematics GA PN793 UT WOS:A1993PN79300024 ER PT J AU LILL, JV AF LILL, JV TI THE CONSTRUCTION OF CRYSTALLINE LATTICE VECTORS IN SPECIFIED ORIENTATIONS FOR ATOMISTIC SIMULATIONS SO COMPUTER PHYSICS COMMUNICATIONS LA English DT Article AB We present an algorithm for the construction of arbitrary crystals in arbitrary orientations. The method is general, requires only readily available lattice and basis vectors and Miller indices as input, and is particularly suitable for molecular dynamics and Monte Carlo simulations. This leads to a simple convention for the specification of surfaces for crystals having more than one atom per primitive cell. We address several specific requirements for efficiently performing atomistic simulations of crystals and surfaces with an imposed stress. RP LILL, JV (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 7 TC 0 Z9 0 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0010-4655 J9 COMPUT PHYS COMMUN JI Comput. Phys. Commun. PD DEC PY 1993 VL 78 IS 1-2 BP 130 EP 140 DI 10.1016/0010-4655(93)90149-7 PG 11 WC Computer Science, Interdisciplinary Applications; Physics, Mathematical SC Computer Science; Physics GA MM217 UT WOS:A1993MM21700012 ER PT J AU WU, C AF WU, C TI HEAT-TRANSFER EFFECT ON THE SPECIFIC POWER-AVAILABILITY OF HEAT ENGINES SO ENERGY CONVERSION AND MANAGEMENT LA English DT Article DE HEAT ENGINE; POWER; HEAT TRANSFER EFFECT AB The maximum possible specific power (specific power availability) that can be obtained from heat engines with a set of high temperature heat source and low temperature sink is analyzed. The heat engines considered in this paper include (1) externally and internally reversible, (2) externally irreversible and internally reversible, (3) externally reversible and internally irreversible and (4) externally and internally irreversible engines. The irreversibilities are assumed caused by heat transfer only. The specific power, defined as the power output per unit total heat exchanger surface area, is adopted as the objective function in determining power economics in this paper. RP WU, C (reprint author), USN ACAD,DEPT MECH ENGN,ANNAPOLIS,MD 21402, USA. NR 0 TC 26 Z9 29 U1 0 U2 0 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0196-8904 J9 ENERG CONVERS MANAGE JI Energy Conv. Manag. PD DEC PY 1993 VL 34 IS 12 BP 1239 EP 1247 DI 10.1016/0196-8904(93)90119-U PG 9 WC Thermodynamics; Energy & Fuels; Mechanics SC Thermodynamics; Energy & Fuels; Mechanics GA LV002 UT WOS:A1993LV00200002 ER PT J AU WU, C AF WU, C TI ANALYSIS OF AN ENDOREVERSIBLE STIRLING COOLER SO ENERGY CONVERSION AND MANAGEMENT LA English DT Article DE STIRLING CYCLE; COOLER; ENDOREVERSIBLE AB An internally reversible and externally irreversible Stirling refrigeration cycle which achieves cryogenic temperatures in a single stage is presented in this paper. The equations relating the maximum cooling load, working fluid temperatures and power input of the cryocooler are found. These relationships provide a base for practicing engineers to design a new cryocooler. RP WU, C (reprint author), USN ACAD,DEPT MECH ENGN,ANNAPOLIS,MD 21402, USA. NR 0 TC 7 Z9 8 U1 0 U2 1 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 DEC PY 1993 VL 34 IS 12 BP 1249 EP 1253 DI 10.1016/0196-8904(93)90120-Y PG 5 WC Thermodynamics; Energy & Fuels; Mechanics SC Thermodynamics; Energy & Fuels; Mechanics GA LV002 UT WOS:A1993LV00200003 ER PT J AU WU, C BLANK, DA AF WU, C BLANK, DA TI OPTIMIZATION OF THE ENDOREVERSIBLE OTTO CYCLE WITH RESPECT TO BOTH POWER AND MEAN EFFECTIVE PRESSURE SO ENERGY CONVERSION AND MANAGEMENT LA English DT Article DE OTTO CYCLE; OPTIMIZATION; ENDOREVERSIBLE; HEAT ENGINE AB The output response of an endoreversible Otto cycle with combustion is optimized with respect to both power and mean effective pressure. The endoreversible cycle is one in which the heating process by combustion and the heat removing process to the surroundings are the only irreversible processes in the cycle. Expressions for these two responses are derived and optimized and a comparative analysis of results conducted. This paper provides an additional criterion for use in the evaluation of the performance and the suitability of an Otto engine. RP WU, C (reprint author), USN ACAD,DEPT MECH ENGN,ANNAPOLIS,MD 21402, USA. NR 0 TC 17 Z9 17 U1 0 U2 1 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 DEC PY 1993 VL 34 IS 12 BP 1255 EP 1259 DI 10.1016/0196-8904(93)90121-P PG 5 WC Thermodynamics; Energy & Fuels; Mechanics SC Thermodynamics; Energy & Fuels; Mechanics GA LV002 UT WOS:A1993LV00200004 ER PT J AU WALLACE, MR YOUSIF, AA MAHROOS, GA MAPES, T THRELFALL, EJ ROWE, B HYAMS, KC AF WALLACE, MR YOUSIF, AA MAHROOS, GA MAPES, T THRELFALL, EJ ROWE, B HYAMS, KC TI CIPROFLOXACIN VERSUS CEFTRIAXONE IN THE TREATMENT OF MULTIRESISTANT TYPHOID-FEVER SO EUROPEAN JOURNAL OF CLINICAL MICROBIOLOGY & INFECTIOUS DISEASES LA English DT Article ID CHLORAMPHENICOL; SALMONELLOSIS AB A randomized trial comparing ceftriaxone (3 g given parenterally per day for 7 days) to ciprofloxacin (500 mg given orally twice a day for 7 days) in the treatment of blood culture positive typhoid fever was conducted. Twenty patients were openly randomized to receive ciprofloxacin and 22 to receive ceftriaxone. The outcome was classified as clinical failure in 6 patients (27 %) in the ceftriaxone group, but in none in the ciprofloxacin group (p = 0.01). The mean duration of fever was four days in the ciprofloxacin group and about five days in the ceftriaxone group (p = 0.04). In the six patients in the ceftriaxone group who experienced failure, therapy was switched to ciprofloxacin and the patients became afebrile and asymptomatic within 48 hours. Patients with resistant strains of Salmonella typhi and patients with sensitive strains responded equally well to ciprofloxacin therapy. Analysis of a subset of 12 of the multiresistant strains revealed that resistance was encoded for by a transferable 180 kilobase plasmid. Ciprofloxacin represents a useful treatment option in areas where multiresistant strains are likely to be encountered. C1 USN HOSP,DEPT CLIN INVEST,SAN DIEGO,CA 92134. SALMANIYA MED CTR,MANAMA,BAHRAIN. USN,MED RES UNIT 3,CAIRO,EGYPT. PUBL HLTH LAB SERV,DIV ENTER PATHOGENS,WHO,LONDON,ENGLAND. USN,MED RES INST,DIV EPIDEMIOL,BETHESDA,MD. RP WALLACE, MR (reprint author), USN HOSP,DEPT INTERNAL MED,DIV INFECT DIS,SAN DIEGO,CA 92134, USA. NR 17 TC 48 Z9 48 U1 0 U2 0 PU FRIEDR VIEWEG SOHN VERLAG GMBH PI WIESBADEN 1 PA PO BOX 5829, W-6200 WIESBADEN 1, GERMANY SN 0934-9723 J9 EUR J CLIN MICROBIOL JI Eur. J. Clin. Microbiol. Infect. Dis. PD DEC PY 1993 VL 12 IS 12 BP 907 EP 910 DI 10.1007/BF01992163 PG 4 WC Infectious Diseases; Microbiology SC Infectious Diseases; Microbiology GA MR484 UT WOS:A1993MR48400002 PM 8187784 ER PT J AU KIDWELL, DA BLANK, DL AF KIDWELL, DA BLANK, DL TI SAMPLE PREPARATION TECHNIQUES - COMMENTS SO FORENSIC SCIENCE INTERNATIONAL LA English DT Article; Proceedings Paper CT 1st International Meeting on Hair Analysis as a Diagnostic Tool for Drugs of Abuse Investigation CY DEC 10-11, 1992 CL GENOA, ITALY SP UN INTERREG CRIME & JUSTICE RES INST, IST SUPER SANITA, INT ASSOC FORENS TOXICOLOGISTS, NIGUARDA CA GRANDA HOSP DE HAIR; DRUGS OF ABUSE; PASSIVE EXPOSURE; FALSE POSITIVES; EXTERNAL CONTAMINATION ID HAIR ANALYSIS; COCAINE METABOLITES; DRUGS; ABUSE; URINE AB The data for hair analysis of drugs of abuse presented by Baumgartner and Hill (Sample preparation techniques, this issue) is discussed and reinterpreted. Based on the issues raised in this commentary, we suggest that the use of hair analysis data for drugs of abuse should proceed with caution until such time as these issues are clearly resolved. At the current level of understanding, the presence of drugs in an individual's hair indicates exposure to that compound. Attempting to expand this observation into the suggestion of use or long-term abuse of a drug would seem unwarranted at this time. C1 USN,BUR NAVAL PERSONNEL,DRUG & ALCOHOL PROGRAM,WASHINGTON,DC 20370. RP KIDWELL, DA (reprint author), USN,RES LAB,CODE 6177,WASHINGTON,DC 20375, USA. NR 26 TC 16 Z9 17 U1 0 U2 0 PU ELSEVIER SCI IRELAND LTD PI CLARE PA CUSTOMER RELATIONS MANAGER, BAY 15, SHANNON INDUSTRIAL ESTATE CO, CLARE, IRELAND SN 0379-0738 J9 FORENSIC SCI INT JI Forensic Sci.Int. PD DEC PY 1993 VL 63 IS 1-3 BP 137 EP 143 DI 10.1016/0379-0738(93)90267-E PG 7 WC Medicine, Legal SC Legal Medicine GA MY442 UT WOS:A1993MY44200015 ER PT J AU BLANK, DL KIDWELL, DA AF BLANK, DL KIDWELL, DA TI EXTERNAL CONTAMINATION OF HAIR BY COCAINE - AN ISSUE IN FORENSIC INTERPRETATION SO FORENSIC SCIENCE INTERNATIONAL LA English DT Article; Proceedings Paper CT 1st International Meeting on Hair Analysis as a Diagnostic Tool for Drugs of Abuse Investigation CY DEC 10-11, 1992 CL GENOA, ITALY SP UN INTERREG CRIME & JUSTICE RES INST, IST SUPER SANITA, INT ASSOC FORENS TOXICOLOGISTS, NIGUARDA CA GRANDA HOSP DE HAIR CONTAMINATION; COCAINE; TANDEM MS ID IDENTIFICATION; GC/MS AB This paper explores the variables by which hair samples may become contaminated with cocaine and thereby generate false positives during analysis of hair samples. A novel method for following the incorporation and removal of cocaine from hair was developed. This method allowed a large number of specimens to be analysed under a variety of conditions with high precision. The quantity of cocaine was carefully followed in each step of a published procedure. Regardless of washing technique, a substantial amount of cocaine could still be found in the final hair digest. Very few of our externally contaminated samples could be identified as externally contaminated by previously published criteria and washing procedures. Attempts to further decontaminate this hair were without success. Our data strongly suggest that external contamination of hair by drugs of abuse may make the interpretation of forensic results problematical. C1 USN,RES LAB,DIV CHEM,WASHINGTON,DC 20375. USN,BUR PERSONNEL,NAVY DRUG & ALCOHOL PROGRAM,WASHINGTON,DC 20370. NR 15 TC 57 Z9 58 U1 2 U2 3 PU ELSEVIER SCI IRELAND LTD PI CLARE PA CUSTOMER RELATIONS MANAGER, BAY 15, SHANNON INDUSTRIAL ESTATE CO, CLARE, IRELAND SN 0379-0738 J9 FORENSIC SCI INT JI Forensic Sci.Int. PD DEC PY 1993 VL 63 IS 1-3 BP 145 EP 156 DI 10.1016/0379-0738(93)90268-F PG 12 WC Medicine, Legal SC Legal Medicine GA MY442 UT WOS:A1993MY44200016 PM 8138216 ER PT J AU BARONAVSKI, AP LADOUCEUR, HD SHAW, JK AF BARONAVSKI, AP LADOUCEUR, HD SHAW, JK TI DEPENDENCE OF SUM-FREQUENCY FIELD INTENSITY ON GROUP-VELOCITY MISMATCHES SO IEEE JOURNAL OF QUANTUM ELECTRONICS LA English DT Article ID PULSES AB The sum frequency field generated by mixing phase matched optical pulses in a nonlinear crystal is studied. Specifically, the field intensity full width half maximum (FWHM) considered as a function of the group velocity mismatch between incident pulses, and also as a function of the mismatch between the generated pulse and one of the incident pulses, is analyzed by numerical and asymptotic techniques. Both mismatch types are allowed to be arbitrary; previous work in this area has, without rigorous justification, set one mismatch type to zero. The intensity FWHM of the sum frequency field refers here to a cross correlation measurement between pulses separated by a time delay to tau, where the FWHM is formed with respect to varying tau, rather than to the time-based FWHM of a sum frequency generated light pulse for a fixed tau. The present paper shows that the FWHM is fundamentally insensitive to mismatch between generated and incident fields, thus providing finally a justification for ignoring this term. On the other hand, the FWHM is shown to vary asymptotically linearly (coefficient approximate to 1) with the mismatch between incident pulses. Some important practical consequences of this phenomenon are discussed. The presentation is confined to pulse profiles of hyperbolic secant-squared type but readily extends to other cases. C1 VIRGINIA POLYTECH INST & STATE UNIV,DEPT MATH,BLACKSBURG,VA 24061. RP BARONAVSKI, AP (reprint author), USN,RES LAB,DIV CHEM,CODE 6110,WASHINGTON,DC 20375, USA. NR 5 TC 5 Z9 5 U1 4 U2 9 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 DEC PY 1993 VL 29 IS 12 BP 2928 EP 2933 DI 10.1109/3.259408 PG 6 WC Engineering, Electrical & Electronic; Optics; Physics, Applied SC Engineering; Optics; Physics GA MV776 UT WOS:A1993MV77600012 ER PT J AU GOPALAKRISHNAN, GK BURNS, WK BULMER, CH AF GOPALAKRISHNAN, GK BURNS, WK BULMER, CH TI MICROWAVE-OPTICAL MIXING IN LINBO3 MODULATORS SO IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES LA English DT Article ID GHZ AB An investigative study of microwave-optical mixing in different configurations of LiNbO3 Mach-Zehnder interferometric modulators ig presented. In each case, models that describe mixer performance are developed and are shown to be in good agreement with measurements. For antenna remoting applications, a technique to down-convert RF signals is demonstrated by cascading in series a pair of Mach-Zehnder interferometric modulators. In general, it is shown that by virtue of their truly broad-band characteristics, interferometric modulators can also be employed as microwave mixers at frequencies up to 40 GHz. RP GOPALAKRISHNAN, GK (reprint author), USN,RES LAB,MARYLAND ADV DEV LAB,CODE 5671,WASHINGTON,DC 20375, USA. NR 8 TC 122 Z9 122 U1 0 U2 3 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0018-9480 J9 IEEE T MICROW THEORY JI IEEE Trans. Microw. Theory Tech. PD DEC PY 1993 VL 41 IS 12 BP 2383 EP 2391 DI 10.1109/22.260732 PG 9 WC Engineering, Electrical & Electronic SC Engineering GA MW877 UT WOS:A1993MW87700048 ER PT J AU SHAW, GJ XAPSOS, MA WEAVER, BD SUMMERS, GP AF SHAW, GJ XAPSOS, MA WEAVER, BD SUMMERS, GP TI LOW-TEMPERATURE PROTON IRRADIATION OF GAAS-MESFETS SO IEEE TRANSACTIONS ON NUCLEAR SCIENCE LA English DT Article; Proceedings Paper CT IEEE 30th Annual International Nuclear and Space Radiation Effects Conference (NSREC) CY JUL 19-23, 1993 CL SNOWBIRD, UT SP IEEE, NUCL & PLASMA SCI SOC, RADIAT EFFECTS COMM, US DEPT DEF, DEF NUCL AGCY, US DEF ENERGY ENERGY, SANDIA NATL LAB, NASA, JET PROPULS LAB ID FIELD-EFFECT TRANSISTORS; GALLIUM-ARSENIDE; STAGE AB GaAs MESFETs and resistors were irradiated with 3 MeV protons at irradiation temperatures (T-IRR ranging from 100 K less than or equal to T-IRR less than or equal to 300 K. It was found that irradiation at T-IRR less than or equal to 225 K was about 2.5 times more effective at degrading the DC electrical parameters of the MESFETs than irradiation at room temperature. Isochronal annealing experiments showed that there was no apparent recovery of the radiation induced degradation for annealing temperatures T-ANNEAL < 225 K. Both the MESFETs and resistors exhibited a broad annealing stage near 270 K. The implications for spaceborne GaAs devices operated at cryogenic temperature are discussed. C1 UNIV MARYLAND,DEPT PHYS,BALTIMORE,MD 21228. RP SHAW, GJ (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 17 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 0018-9499 J9 IEEE T NUCL SCI JI IEEE Trans. Nucl. Sci. PD DEC PY 1993 VL 40 IS 6 BP 1300 EP 1306 DI 10.1109/23.273538 PN 1 PG 7 WC Engineering, Electrical & Electronic; Nuclear Science & Technology SC Engineering; Nuclear Science & Technology GA MV375 UT WOS:A1993MV37500006 ER PT J AU FREITAG, RK BROWN, DB DOZIER, CM AF FREITAG, RK BROWN, DB DOZIER, CM TI EXPERIMENTAL-EVIDENCE OF 2 SPECIES OF RADIATION-INDUCED TRAPPED POSITIVE CHARGE SO IEEE TRANSACTIONS ON NUCLEAR SCIENCE LA English DT Article; Proceedings Paper CT IEEE 30th Annual International Nuclear and Space Radiation Effects Conference (NSREC) CY JUL 19-23, 1993 CL SNOWBIRD, UT SP IEEE, NUCL & PLASMA SCI SOC, RADIAT EFFECTS COMM, US DEPT DEF, DEF NUCL AGCY, US DEF ENERGY ENERGY, SANDIA NATL LAB, NASA, JET PROPULS LAB ID OXIDE-SEMICONDUCTOR CAPACITORS; GENERATION; HOLES AB The effects of alternating bias anneals of MOS transistors following either x-irradiation or Fowler-Nordheim Tunneling have been studied. It is found that some of the generated defects can be repeatedly charged and discharged with a change of applied oxide field. Two models to explain this phenomenon are discussed. One assumes a single defect, the E' center. The other model assumes a two defect model. The results of this work are shown to be more consistent with the two defect model. RP FREITAG, RK (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 16 TC 37 Z9 37 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 0018-9499 J9 IEEE T NUCL SCI JI IEEE Trans. Nucl. Sci. PD DEC PY 1993 VL 40 IS 6 BP 1316 EP 1322 DI 10.1109/23.273536 PN 1 PG 7 WC Engineering, Electrical & Electronic; Nuclear Science & Technology SC Engineering; Nuclear Science & Technology GA MV375 UT WOS:A1993MV37500008 ER PT J AU SAKS, NS KLEIN, RB STAHLBUSH, RE MRSTIK, BJ RENDELL, RW AF SAKS, NS KLEIN, RB STAHLBUSH, RE MRSTIK, BJ RENDELL, RW TI EFFECTS OF PAST-STRESS HYDROGEN ANNEALING ON MOS OXIDES AFTER CO-60 IRRADIATION OR FOWLER-NORDHEIM INJECTION SO IEEE TRANSACTIONS ON NUCLEAR SCIENCE LA English DT Article; Proceedings Paper CT IEEE 30th Annual International Nuclear and Space Radiation Effects Conference (NSREC) CY JUL 19-23, 1993 CL SNOWBIRD, UT SP IEEE, NUCL & PLASMA SCI SOC, RADIAT EFFECTS COMM, US DEPT DEF, DEF NUCL AGCY, US DEF ENERGY ENERGY, SANDIA NATL LAB, NASA, JET PROPULS LAB ID INTERFACE STATES; TRAP GENERATION; SILICON DIOXIDE; POSITIVE CHARGE; CAPACITORS; DIFFUSION; FILMS AB Changes in interface trap density D-it have been determined in MOSFETs as a function of, time during hydrogen annealing at 295K. Large increases in D-it are observed during H-2 annealing in MOSFETs previously stressed by either Co-60 irradiation or Fowler-Nordheim electron injection. The annealing behavior is very similar for both types of stress, which suggests that the D-it creation mechanism involves similar chemistry for hydrogen reactions. Studies of the time dependence of D-it creation as a function of MOSFET gate length show that the time dependence is, limited primarily by lateral diffusion of molecular hydrogen (H-2) through the gate oxide. An activation energy of 0.57 eV, which is consistent with H-2 diffusion, is obtained from the temperature dependence. C1 SFA INC,LANDOVER,MD 20785. RP SAKS, NS (reprint author), USN,RES LAB,CODE 6810,WASHINGTON,DC 20375, USA. NR 27 TC 27 Z9 27 U1 0 U2 0 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0018-9499 J9 IEEE T NUCL SCI JI IEEE Trans. Nucl. Sci. PD DEC PY 1993 VL 40 IS 6 BP 1341 EP 1349 DI 10.1109/23.273533 PN 1 PG 9 WC Engineering, Electrical & Electronic; Nuclear Science & Technology SC Engineering; Nuclear Science & Technology GA MV375 UT WOS:A1993MV37500011 ER PT J AU SUMMERS, GP BURKE, EA SHAPIRO, P MESSENGER, SR WALTERS, RJ AF SUMMERS, GP BURKE, EA SHAPIRO, P MESSENGER, SR WALTERS, RJ TI DAMAGE CORRELATIONS IN SEMICONDUCTORS EXPOSED TO GAMMA-RADIATION, ELECTRON-RADIATION AND PROTON-RADIATION SO IEEE TRANSACTIONS ON NUCLEAR SCIENCE LA English DT Article; Proceedings Paper CT IEEE 30th Annual International Nuclear and Space Radiation Effects Conference (NSREC) CY JUL 19-23, 1993 CL SNOWBIRD, UT SP IEEE, NUCL & PLASMA SCI SOC, RADIAT EFFECTS COMM, US DEPT DEF, DEF NUCL AGCY, US DEF ENERGY ENERGY, SANDIA NATL LAB, NASA, JET PROPULS LAB ID INDUCED DISPLACEMENT DAMAGE; SOLAR-CELLS; SINGLE-CRYSTALS; SILICON AB The use of nonionizing energy loss (NIEL) in predicting the effect of gamma, electron and proton irradiations on Si, GaAs and InP devices is discussed. The NIEL for electrons and protons has been calculated from the displacement threshold to 200 MeV. Convoluting the electron NIEL with the ''slowed down'' Compton secondary electron spectrum gives an effective NIEL for Co-60 gammas, enabling gamma-induced displacement damage to be correlated with particle results. The fluences of 1 MeV electrons equivalent to irradiation with 1 Mrad(Si) for Si, GaAs and InP are given. Analytic proton NIEL calculations and results derived from the Monte Carlo code TRIM agree exactly so long as straggling is not significant. The NIEL calculations are compared with experimental proton and electron damage coefficients using solar cells as examples. A linear relationship is found between the NIEL and proton damage coefficients for Si, GaAs and InP devices. For electrons, there appears to be a linear dependence for n-Si and n-GaAs, but for p-Si there is a quadratic relationship which decreases the damage coefficient at 1 MeV by a factor of similar to 10 below the value for n-Si. The present results greatly extend the range of environments for which damage calculations based on NIEL can be applied. The NIEL results are presented in tabular form for ease of calculation. C1 UNIV MARYLAND BALTIMORE CTY,DEPT PHYS,BALTIMORE,MD 21228. SFA INC,LANDOVER,MD 20785. RP SUMMERS, GP (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 33 TC 309 Z9 311 U1 5 U2 34 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 DEC PY 1993 VL 40 IS 6 BP 1372 EP 1379 DI 10.1109/23.273529 PN 1 PG 8 WC Engineering, Electrical & Electronic; Nuclear Science & Technology SC Engineering; Nuclear Science & Technology GA MV375 UT WOS:A1993MV37500015 ER PT J AU WEATHERFORD, TR MCDONALD, PT CAMPBELL, AB LANGWORTHY, JB AF WEATHERFORD, TR MCDONALD, PT CAMPBELL, AB LANGWORTHY, JB TI SEU RATE PREDICTION AND MEASUREMENT OF GAAS SRAMS ONBOARD THE CRRES SATELLITE SO IEEE TRANSACTIONS ON NUCLEAR SCIENCE LA English DT Article; Proceedings Paper CT IEEE 30th Annual International Nuclear and Space Radiation Effects Conference (NSREC) CY JUL 19-23, 1993 CL SNOWBIRD, UT SP IEEE, NUCL & PLASMA SCI SOC, RADIAT EFFECTS COMM, US DEPT DEF, DEF NUCL AGCY, US DEF ENERGY ENERGY, SANDIA NATL LAB, NASA, JET PROPULS LAB AB An analysis is presented on SPICE predicted, SEU ground tested, and CRRES observed heavy ion and proton soft error rates of GaAs SRAMs. Upset rates overestimated the susceptibility of the GaAs SRAMs. Differences are accounted to several factors. RP WEATHERFORD, TR (reprint author), USN,RES LAB,CODE 6613,4555 OVERLOOK AVE SW,WASHINGTON,DC 20375, USA. NR 15 TC 5 Z9 6 U1 0 U2 0 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0018-9499 J9 IEEE T NUCL SCI JI IEEE Trans. Nucl. Sci. PD DEC PY 1993 VL 40 IS 6 BP 1463 EP 1470 DI 10.1109/23.273517 PN 1 PG 8 WC Engineering, Electrical & Electronic; Nuclear Science & Technology SC Engineering; Nuclear Science & Technology GA MV375 UT WOS:A1993MV37500027 ER PT J AU DALE, C MARSHALL, P CUMMINGS, B SHAMEY, L HOLLAND, A AF DALE, C MARSHALL, P CUMMINGS, B SHAMEY, L HOLLAND, A TI DISPLACEMENT DAMAGE EFFECTS IN MIXED PARTICLE ENVIRONMENTS FOR SHIELDED SPACECRAFT CCDS SO IEEE TRANSACTIONS ON NUCLEAR SCIENCE LA English DT Article; Proceedings Paper CT IEEE 30th Annual International Nuclear and Space Radiation Effects Conference (NSREC) CY JUL 19-23, 1993 CL SNOWBIRD, UT SP IEEE, NUCL & PLASMA SCI SOC, RADIAT EFFECTS COMM, US DEPT DEF, DEF NUCL AGCY, US DEF ENERGY ENERGY, SANDIA NATL LAB, NASA, JET PROPULS LAB ID CHARGE-COUPLED-DEVICES; LOW-TEMPERATURE; SILICON; CODE AB Analysis of monoenergetic proton test data reveals displacement,damage degradation of charge transfer efficiency in state-of-the-art CCDs. New measurements, in combination with literature data, demonstrate good agreement between the energy dependencies of proton damage and the nonionizing energy loss (NIEL) for protons in Si. Massive shields being considered to preserve CCD performance in satellites are then analyzed using the transport code BRYNTRN which quantifies both primary and secondary particle production. Using NIEL to combine the cumulative effects of both protons and neutrons reaching the CCD, we compare Al and Ta shield approaches for both trapped and flare proton environments. In general, massive Ta shields have diminished benefit owing to damage from large secondary neutron fluxes. Finally, analysis with Shockley-Read-Hall theory illustrates the importance of CCD operating conditions and transfer efficiency measurement techniques in evaluating flight performance and comparing results between devices and laboratories. C1 SFA INC,LANDOVER,MD 20785. BALL AEROSP,BOULDER,CO 80306. UNIV LEICESTER,LEICESTER LE1 7RH,ENGLAND. RP DALE, C (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 34 TC 59 Z9 64 U1 1 U2 7 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0018-9499 J9 IEEE T NUCL SCI JI IEEE Trans. Nucl. Sci. PD DEC PY 1993 VL 40 IS 6 BP 1628 EP 1637 DI 10.1109/23.273497 PN 1 PG 10 WC Engineering, Electrical & Electronic; Nuclear Science & Technology SC Engineering; Nuclear Science & Technology GA MV375 UT WOS:A1993MV37500050 ER PT J AU LABEL, KA MARSHALL, P DALE, C CRABTREE, CM STASSINOPOULOS, EG MILLER, JT GATES, MM AF LABEL, KA MARSHALL, P DALE, C CRABTREE, CM STASSINOPOULOS, EG MILLER, JT GATES, MM TI SEDS MIL-STD-1773 FIBER OPTIC DATA BUS - PROTON IRRADIATION TEST-RESULTS AND SPACEFLIGHT SEU DATA SO IEEE TRANSACTIONS ON NUCLEAR SCIENCE LA English DT Article; Proceedings Paper CT IEEE 30th Annual International Nuclear and Space Radiation Effects Conference (NSREC) CY JUL 19-23, 1993 CL SNOWBIRD, UT SP IEEE, NUCL & PLASMA SCI SOC, RADIAT EFFECTS COMM, US DEPT DEF, DEF NUCL AGCY, US DEF ENERGY ENERGY, SANDIA NATL LAB, NASA, JET PROPULS LAB AB We present proton test and space flight single event effect data for NASA's first fiber optic data bus. Bit error rate predictions based on a new proton direct ionization. model agree well with flight data for proton belt and solar flare effects. C1 NRL,SFA,WASHINGTON,DC. HUGHES ST SYST CORP,SEABROOK,MD. JACKSON & TULL,SEABROOK,MD. RP LABEL, KA (reprint author), NASA,GSFC,GREENBELT,MD 20771, USA. NR 5 TC 19 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 0018-9499 J9 IEEE T NUCL SCI JI IEEE Trans. Nucl. Sci. PD DEC PY 1993 VL 40 IS 6 BP 1638 EP 1644 DI 10.1109/23.273554 PN 1 PG 7 WC Engineering, Electrical & Electronic; Nuclear Science & Technology SC Engineering; Nuclear Science & Technology GA MV375 UT WOS:A1993MV37500051 ER PT J AU CUTCHIN, JH MARSHALL, PW WEATHERFORD, TR LANGWORTHY, J PETERSEN, EL CAMPBELL, AB HANKA, S PECZALSKI, A AF CUTCHIN, JH MARSHALL, PW WEATHERFORD, TR LANGWORTHY, J PETERSEN, EL CAMPBELL, AB HANKA, S PECZALSKI, A TI HEAVY-ION AND PROTON ANALYSIS OF A GAAS C-HIGFET SRAM SO IEEE TRANSACTIONS ON NUCLEAR SCIENCE LA English DT Article; Proceedings Paper CT IEEE 30th Annual International Nuclear and Space Radiation Effects Conference (NSREC) CY JUL 19-23, 1993 CL SNOWBIRD, UT SP IEEE, NUCL & PLASMA SCI SOC, RADIAT EFFECTS COMM, US DEPT DEF, DEF NUCL AGCY, US DEF ENERGY ENERGY, SANDIA NATL LAB, NASA, JET PROPULS LAB AB We present heavy ion and proton upset measurements, including total dose, and displacement damage on a one micron, GaAs, complementaty-heterostructure insulated-gate FET (C-HIGFET) 1k x 1 SRAM. SEU characteristics show a two order of magnitude improvement over GaAs MESFET technology. Heavy-ion upset equilibrium measurements show that all cells upset with equal probability at the five percent LET threshold. This indicates that for this device the shape of the cross section versus LET curve is a result of a probability distribution that applies to all cells and is not the result of variations in cell sensitivities. The data set also indicates that the traditional two-dimensional cos(theta) normalization to LET and fluence are not applicable to this technology. C1 USN,RES LAB,WASHINGTON,DC 20375. HONEYWELL INC,MINNEAPOLIS,MN 55420. NR 7 TC 19 Z9 19 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 0018-9499 J9 IEEE T NUCL SCI JI IEEE Trans. Nucl. Sci. PD DEC PY 1993 VL 40 IS 6 BP 1660 EP 1665 DI 10.1109/23.273495 PN 1 PG 6 WC Engineering, Electrical & Electronic; Nuclear Science & Technology SC Engineering; Nuclear Science & Technology GA MV375 UT WOS:A1993MV37500054 ER PT J AU NOWLIN, RN FLEETWOOD, DM SCHRIMPF, RD PEASE, RL COMBS, WE AF NOWLIN, RN FLEETWOOD, DM SCHRIMPF, RD PEASE, RL COMBS, WE TI HARDNESS-ASSURANCE AND TESTING ISSUES FOR BIPOLAR/BICMOS DEVICES SO IEEE TRANSACTIONS ON NUCLEAR SCIENCE LA English DT Article; Proceedings Paper CT IEEE 30th Annual International Nuclear and Space Radiation Effects Conference (NSREC) CY JUL 19-23, 1993 CL SNOWBIRD, UT SP IEEE, NUCL & PLASMA SCI SOC, RADIAT EFFECTS COMM, US DEPT DEF, DEF NUCL AGCY, US DEF ENERGY ENERGY, SANDIA NATL LAB, NASA, JET PROPULS LAB ID OXIDE-SEMICONDUCTOR DEVICES; X-RAY; IONIZING-RADIATION; ELECTRON; DAMAGE AB Different hardness-assurance tests are often required for advanced bipolar devices than for CMOS devices. In this work, the dose-rate dependence of bipolar current-gain degradation is mapped over a wide range of dose rates for the first time, and it is very different from analogous MOSFET curves. Annealing experiments following irradiation show negligible change in base current at room temperature, but significant recovery at temperatures of 100 degrees C and above. In contrast to what is observed in MOSFET's, irradiation and annealing tests cannot be used to predict the low-dose-rate response of bipolar devices. A comparison of x-ray-induced and Co-60 gamma-ray-induced gain degradation is reported for the first time for bipolar transistors. The role of the emitter bias during irradiation is also examined. Implications fdr hardening and hardness assurance are discussed. C1 SANDIA NATL LABS,ALBUQUERQUE,NM 87185. RLP RES,ALBUQUERQUE,NM 87106. USN,CTR SURFACE WARFARE,CRANE,IN 47522. RP NOWLIN, RN (reprint author), UNIV ARIZONA,DEPT ECE,TUCSON,AZ 85721, USA. RI Schrimpf, Ronald/L-5549-2013 OI Schrimpf, Ronald/0000-0001-7419-2701 NR 19 TC 66 Z9 74 U1 0 U2 8 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 DEC PY 1993 VL 40 IS 6 BP 1686 EP 1693 DI 10.1109/23.273492 PN 1 PG 8 WC Engineering, Electrical & Electronic; Nuclear Science & Technology SC Engineering; Nuclear Science & Technology GA MV375 UT WOS:A1993MV37500057 ER PT J AU NAMENSON, A MYERS, D AF NAMENSON, A MYERS, D TI 100-PERCENT ABRUPT FAILURE BETWEEN 2 RADIATION-LEVELS IN STEP-STRESS TESTING OF ELECTRONIC PARTS SO IEEE TRANSACTIONS ON NUCLEAR SCIENCE LA English DT Article; Proceedings Paper CT IEEE 30th Annual International Nuclear and Space Radiation Effects Conference (NSREC) CY JUL 19-23, 1993 CL SNOWBIRD, UT SP IEEE, NUCL & PLASMA SCI SOC, RADIAT EFFECTS COMM, US DEPT DEF, DEF NUCL AGCY, US DEF ENERGY ENERGY, SANDIA NATL LAB, NASA, JET PROPULS LAB ID HARDNESS ASSURANCE AB A new and rigorous analysis is developed for treating a common problem in hardness assurance where all the parts frill between two consecutive test levels in a step-stress test. The present method, which is the mathematically correct way to calculate confidence and probability of part survival, gives significantly more precise and conservative estimates of survivability than do previous treatments of the same problem. The analysis also yields a methodology which encompasses LTPD testing, overtesting and suggests a new kind of overtest using two overtest levels. C1 MYERS & ASSOCIATES,ALBUQUERQUE,NM 87123. RP NAMENSON, A (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 4 TC 3 Z9 3 U1 0 U2 0 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0018-9499 J9 IEEE T NUCL SCI JI IEEE Trans. Nucl. Sci. PD DEC PY 1993 VL 40 IS 6 BP 1709 EP 1713 DI 10.1109/23.273489 PN 1 PG 5 WC Engineering, Electrical & Electronic; Nuclear Science & Technology SC Engineering; Nuclear Science & Technology GA MV375 UT WOS:A1993MV37500060 ER PT J AU ANDERSON, WT GERDES, J ROUSSOS, JA AF ANDERSON, WT GERDES, J ROUSSOS, JA TI TEMPERATURE-DEPENDENT GAAS MMIC RADIATION EFFECTS SO IEEE TRANSACTIONS ON NUCLEAR SCIENCE LA English DT Article ID FIELD-EFFECT TRANSISTORS; TRANSIENT RADIATION; IONIZING-RADIATION; FETS; CIRCUITS AB The temperature dependence of pulsed neutron and flash x-ray radiation effects was studied in GaAs MMICs. Above room temperature the long term current transients are dominated by electron trapping in previously existing defects. At low temperature in the range 126 to 259 K neutron induced lattice damage appears to play an increasingly important role in producing long term current transients. C1 USA, PULSE RADIAT FACIL, ABERDEEN PROVING GROUND, MD USA. RP USN, RES LAB, CODE 6855, WASHINGTON, DC 20375 USA. NR 19 TC 1 Z9 1 U1 0 U2 0 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI PISCATAWAY PA 445 HOES LANE, PISCATAWAY, NJ 08855-4141 USA SN 0018-9499 EI 1558-1578 J9 IEEE T NUCL SCI JI IEEE Trans. Nucl. Sci. PD DEC PY 1993 VL 40 IS 6 BP 1735 EP 1739 DI 10.1109/23.273485 PN 1 PG 5 WC Engineering, Electrical & Electronic; Nuclear Science & Technology SC Engineering; Nuclear Science & Technology GA MV375 UT WOS:A1993MV37500064 ER PT J AU STAHLBUSH, RE HUGHES, HL KRULL, WA AF STAHLBUSH, RE HUGHES, HL KRULL, WA TI REDUCTION OF CHARGE TRAPPING AND ELECTRON-TUNNELING IN SIMOX BY SUPPLEMENTAL IMPLANTATION OF OXYGEN SO IEEE TRANSACTIONS ON NUCLEAR SCIENCE LA English DT Article; Proceedings Paper CT IEEE 30th Annual International Nuclear and Space Radiation Effects Conference (NSREC) CY JUL 19-23, 1993 CL SNOWBIRD, UT SP IEEE, NUCL & PLASMA SCI SOC, RADIAT EFFECTS COMM, US DEPT DEF, DEF NUCL AGCY, US DEF ENERGY ENERGY, SANDIA NATL LAB, NASA, JET PROPULS LAB ID BURIED OXIDES; SILICON DIOXIDE; HOLE; TRANSPORT; CENTERS; SIO2 AB The reduction of excess-silicon related defects in SIMOX by the supplemental implantation of oxygen has been examined. The supplemental implant is 6% of the oxygen dose used to form the buried oxide, and is followed by a 1000 degrees C anneal, in contrast to the >1300 degrees C anneal used to form the buried oxide layer of SIMOX. The defects examined include shallow electron traps, deep hole traps, and silicon clusters. The radiation-induced shallow electron and deep hole trapping are measured by cryogenic detrapping and isothermal annealing techniques. The low-field (3 to 6 MV/cm) electron tunneling is interpreted as due to a two phase mixture of stoichiometric SiO2 and Si clusters a few nm in size. Single and triple SIMOX samples have been examined. All of the defects are reduced by the supplemental oxygen processing. Shallow electron trapping is reduced by an order of magnitude. Because of the larger capture cross section for hole trapping, hole trapping is not reduced as much. The low-field electron tunneling due to Si clusters is also significantly reduced. Both uniform and nonuniform electron tunneling have been observed in SIMOX samples without supplemental processing. In samples exhibiting only uniform tunneling, electron capture at holes has been observed. The nonuniform tunneling is superimposed upon the uniform tunneling and is characterized by current spiking. C1 IBIS TECHNOL CORP,DANVERS,MA 01923. RP STAHLBUSH, RE (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 23 TC 25 Z9 26 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 0018-9499 J9 IEEE T NUCL SCI JI IEEE Trans. Nucl. Sci. PD DEC PY 1993 VL 40 IS 6 BP 1740 EP 1747 DI 10.1109/23.273484 PN 1 PG 8 WC Engineering, Electrical & Electronic; Nuclear Science & Technology SC Engineering; Nuclear Science & Technology GA MV375 UT WOS:A1993MV37500065 ER PT J AU DELAUS, M EMILY, D MAPPES, B PEASE, R AF DELAUS, M EMILY, D MAPPES, B PEASE, R TI CONVERTING A BULK RADIATION-HARDENED BICMOS TECHNOLOGY INTO A DIELECTRICALLY-ISOLATED PROCESS SO IEEE TRANSACTIONS ON NUCLEAR SCIENCE LA English DT Article; Proceedings Paper CT IEEE 30th Annual International Nuclear and Space Radiation Effects Conference (NSREC) CY JUL 19-23, 1993 CL SNOWBIRD, UT SP IEEE, NUCL & PLASMA SCI SOC, RADIAT EFFECTS COMM, US DEPT DEF, DEF NUCL AGCY, US DEF ENERGY ENERGY, SANDIA NATL LAB, NASA, JET PROPULS LAB AB Development of a dielectrically-isolated (DI) radiation-hardened BiCMOS process is reported. The process is fabricated on a bonded-wafer silicon-on-insulator (SOI) substrate and employs deep trenches for lateral device isolation. C1 USN,CTR SURFACE WARFARE,CRANE,IN. RLP RES INC,ALBUQUERQUE,NM. RP DELAUS, M (reprint author), ANALOG DEVICES SEMICOND,WILMINGTON,DE, USA. NR 5 TC 4 Z9 4 U1 0 U2 0 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0018-9499 J9 IEEE T NUCL SCI JI IEEE Trans. Nucl. Sci. PD DEC PY 1993 VL 40 IS 6 BP 1774 EP 1779 DI 10.1109/23.273480 PN 1 PG 6 WC Engineering, Electrical & Electronic; Nuclear Science & Technology SC Engineering; Nuclear Science & Technology GA MV375 UT WOS:A1993MV37500069 ER PT J AU XAPSOS, MA WEATHERFORD, TR SHAPIRO, P AF XAPSOS, MA WEATHERFORD, TR SHAPIRO, P TI THE SHAPE OF HEAVY-ION UPSET CROSS-SECTION CURVES SO IEEE TRANSACTIONS ON NUCLEAR SCIENCE LA English DT Article; Proceedings Paper CT IEEE 30th Annual International Nuclear and Space Radiation Effects Conference (NSREC) CY JUL 19-23, 1993 CL SNOWBIRD, UT SP IEEE, NUCL & PLASMA SCI SOC, RADIAT EFFECTS COMM, US DEPT DEF, DEF NUCL AGCY, US DEF ENERGY ENERGY, SANDIA NATL LAB, NASA, JET PROPULS LAB AB An approach is developed to describe heavy ion single event upset cross section curves. It accounts for all significant mechanisms which cause the curve to deviate from ideal, step function-like behavior. The method is developed in terms of the charge deposited by an incident ion in a memory cell and is therefore free of ambiguities associated with the effective LET concept. It is suggested that this type of approach is an improvement over current methods used to characterize a memory response to accelerator tests. This has significant implications for predicting space upset rates. C1 SFA INC,LANDOVER,MD 20785. RP XAPSOS, MA (reprint author), USN,RES LAB,RADIAT EFFECTS BRANCH,WASHINGTON,DC 20375, USA. NR 12 TC 19 Z9 19 U1 0 U2 0 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0018-9499 J9 IEEE T NUCL SCI JI IEEE Trans. Nucl. Sci. PD DEC PY 1993 VL 40 IS 6 BP 1812 EP 1819 DI 10.1109/23.273475 PN 1 PG 8 WC Engineering, Electrical & Electronic; Nuclear Science & Technology SC Engineering; Nuclear Science & Technology GA MV375 UT WOS:A1993MV37500074 ER PT J AU MCMORROW, D WEATHERFORD, T KNUDSON, AR TRAN, LH MELINGER, JS CAMPBELL, AB AF MCMORROW, D WEATHERFORD, T KNUDSON, AR TRAN, LH MELINGER, JS CAMPBELL, AB TI SINGLE-EVENT DYNAMICS OF HIGH-PERFORMANCE HBTS AND GAAS-MESFETS SO IEEE TRANSACTIONS ON NUCLEAR SCIENCE LA English DT Article; Proceedings Paper CT IEEE 30th Annual International Nuclear and Space Radiation Effects Conference (NSREC) CY JUL 19-23, 1993 CL SNOWBIRD, UT SP IEEE, NUCL & PLASMA SCI SOC, RADIAT EFFECTS COMM, US DEPT DEF, DEF NUCL AGCY, US DEF ENERGY ENERGY, SANDIA NATL LAB, NASA, JET PROPULS LAB ID INDUCED CHARGE COLLECTION; HETEROJUNCTION BIPOLAR-TRANSISTORS; DEVICES; UPSETS; PULSES AB Picosecond charge-collection transients measured for GaAs/AlGaAs HBTs following 3.0 MeV alpha-particle and 620 nm picosecond laser excitation reveal charge-collection efficiencies up to twenty-eight times smaller than for GaAs MESFETs, with similar to 90% of the charge collected within 75 ps of the ionizing event. The small charge-collection efficiency of the HBTs is a consequence of the ultrafast charge-collection dynamics in these devices. We show that picosecond laser excitation reproduces nicely the ion-induced transients, providing a valuable tool for the investigation of charge-collection and SEU phenomena in these devices. C1 SFA INC,LANDOVER,MD. RP MCMORROW, D (reprint author), USN,RES LAB,CODE 6613,WASHINGTON,DC 20375, USA. NR 23 TC 20 Z9 21 U1 0 U2 3 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0018-9499 J9 IEEE T NUCL SCI JI IEEE Trans. Nucl. Sci. PD DEC PY 1993 VL 40 IS 6 BP 1858 EP 1866 DI 10.1109/23.273469 PN 1 PG 9 WC Engineering, Electrical & Electronic; Nuclear Science & Technology SC Engineering; Nuclear Science & Technology GA MV375 UT WOS:A1993MV37500080 ER PT J AU WEATHERFORD, TR MCMORROW, D CURTICE, WR KNUDSON, AR CAMPBELL, AB AF WEATHERFORD, TR MCMORROW, D CURTICE, WR KNUDSON, AR CAMPBELL, AB TI SINGLE EVENT INDUCED CHARGE-TRANSPORT MODELING OF GAAS-MESFETS SO IEEE TRANSACTIONS ON NUCLEAR SCIENCE LA English DT Article; Proceedings Paper CT IEEE 30th Annual International Nuclear and Space Radiation Effects Conference (NSREC) CY JUL 19-23, 1993 CL SNOWBIRD, UT SP IEEE, NUCL & PLASMA SCI SOC, RADIAT EFFECTS COMM, US DEPT DEF, DEF NUCL AGCY, US DEF ENERGY ENERGY, SANDIA NATL LAB, NASA, JET PROPULS LAB ID COLLECTION; FETS AB Two-dimensional computer simulations of charge collection phenomena in GaAs MESFETs have been performed for alpha and laser ionization. In both cases more charge is collected than is created by the ionizing event. The simulations indicate that a bipolar transport mechanism (t < 60 ps) and a channel modulation mechanism (t > 40 ps) are responsible for this enhanced charge collection. C1 USN,RES LAB,WASHINGTON,DC 20375. NR 16 TC 28 Z9 28 U1 0 U2 0 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0018-9499 J9 IEEE T NUCL SCI JI IEEE Trans. Nucl. Sci. PD DEC PY 1993 VL 40 IS 6 BP 1867 EP 1871 DI 10.1109/23.273468 PN 1 PG 5 WC Engineering, Electrical & Electronic; Nuclear Science & Technology SC Engineering; Nuclear Science & Technology GA MV375 UT WOS:A1993MV37500081 ER PT J AU PETERSEN, EL PICKEL, JC SMITH, EC RUDECK, PJ LETAW, JR AF PETERSEN, EL PICKEL, JC SMITH, EC RUDECK, PJ LETAW, JR TI GEOMETRICAL FACTORS IN SEE RATE CALCULATIONS SO IEEE TRANSACTIONS ON NUCLEAR SCIENCE LA English DT Article ID RAY-INDUCED ERRORS; EVENT UPSET RATE; CHARGE COLLECTION; CMOS SRAMS; MEMORY CELLS; SILICON; SENSITIVITY; DEVICES; IONS AB The prediction of single event rates depends upon a number of geometrical factors that affect the interpretation of the ground test data and the approach to rate calculations. This paper presents a critical review of these factors. The paper reviews heavy ion rate prediction methods and recommends a standard approach. C1 S CUBED INC, LA JOLLA, CA USA. SEVERN COMM CORP, MILLERSVILLE, MD USA. RP PETERSEN, EL (reprint author), USN, RES LAB, WASHINGTON, DC 20375 USA. NR 50 TC 67 Z9 69 U1 0 U2 4 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI PISCATAWAY PA 445 HOES LANE, PISCATAWAY, NJ 08855-4141 USA SN 0018-9499 EI 1558-1578 J9 IEEE T NUCL SCI JI IEEE Trans. Nucl. Sci. PD DEC PY 1993 VL 40 IS 6 BP 1888 EP 1909 DI 10.1109/23.273465 PN 1 PG 22 WC Engineering, Electrical & Electronic; Nuclear Science & Technology SC Engineering; Nuclear Science & Technology GA MV375 UT WOS:A1993MV37500084 ER PT J AU BROWN, AO BHUVA, B KERNS, SE STAPOR, WJ AF BROWN, AO BHUVA, B KERNS, SE STAPOR, WJ TI PRACTICAL APPROACH TO DETERMINING CHARGE COLLECTED IN MULTIJUNCTION STRUCTURES DUE TO THE ION SHUNT EFFECT SO IEEE TRANSACTIONS ON NUCLEAR SCIENCE LA English DT Article ID SILICON; TRACK AB This paper will present the algorithms and results of a computer program used to determine the charge collected on silicon semiconductor transistors due to the ion shunt effect. The program is unique because it is quick and simple to use and because it uses a general algorithm to determine an accurate initial electron-hole pair distribution in the ion track. C1 USN, RES LAB, WASHINGTON, DC 20375 USA. RP BROWN, AO (reprint author), VANDERBILT UNIV, DEPT ELECT ENGN, NASHVILLE, TN 37235 USA. NR 18 TC 7 Z9 7 U1 0 U2 0 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI PISCATAWAY PA 445 HOES LANE, PISCATAWAY, NJ 08855-4141 USA SN 0018-9499 EI 1558-1578 J9 IEEE T NUCL SCI JI IEEE Trans. Nucl. Sci. PD DEC PY 1993 VL 40 IS 6 BP 1918 EP 1925 DI 10.1109/23.273463 PN 1 PG 8 WC Engineering, Electrical & Electronic; Nuclear Science & Technology SC Engineering; Nuclear Science & Technology GA MV375 UT WOS:A1993MV37500086 ER PT J AU DUSSAULT, H HOWARD, JW BLOCK, RC PINTO, MR STAPOR, WJ KNUDSON, AR AF DUSSAULT, H HOWARD, JW BLOCK, RC PINTO, MR STAPOR, WJ KNUDSON, AR TI NUMERICAL-SIMULATION OF HEAVY-ION CHARGE GENERATION AND COLLECTION DYNAMICS SO IEEE TRANSACTIONS ON NUCLEAR SCIENCE LA English DT Article ID SILICON; ENERGY AB This paper describes a complete simulation approach to investigating the physics of heavy-ion charge generation and collection during a single event transient in a PN diode. The simulations explore the effects of different ion track models, applied biases, background dopings, and LET on the transient responses of a PN diode. The simulation results show that ion track structure and charge collection via diffusion-dominated processes play important roles in determining device transient responses. The simulations show no evidence of rapid charge collection in excess of that deposited in the device depletion region in typical funneling time frames (i.e., by time to peak current or-in less than 500 ps). Further the simulations clearly show that the device transient responses are not simple functions of the ion's incident LET. The simulation results imply that future studies and experiments should consider the effects of ion track structure in addition to LET and extend transient charge collection times to insure that reported charge collection efficiencies include diffusion-dominated collection processes. C1 USAF, ROME LAB, ERDA, GRIFFISS AFB, NY 13441 USA. AT&T BELL LABS, MURRAY HILL, NJ 07974 USA. USN, RES LAB, WASHINGTON, DC 20375 USA. RP DUSSAULT, H (reprint author), RENSSELAER POLYTECH INST, DEPT NUCL ENGN & ENGN PHYS, TROY, NY 12180 USA. NR 25 TC 40 Z9 42 U1 0 U2 3 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI PISCATAWAY PA 445 HOES LANE, PISCATAWAY, NJ 08855-4141 USA SN 0018-9499 EI 1558-1578 J9 IEEE T NUCL SCI JI IEEE Trans. Nucl. Sci. PD DEC PY 1993 VL 40 IS 6 BP 1926 EP 1934 DI 10.1109/23.273462 PN 1 PG 9 WC Engineering, Electrical & Electronic; Nuclear Science & Technology SC Engineering; Nuclear Science & Technology GA MV375 UT WOS:A1993MV37500087 ER PT J AU BREWS, JR ALLENSPACH, M SCHRIMPF, RD GALLOWAY, KF TITUS, JL WHEATLEY, CF AF BREWS, JR ALLENSPACH, M SCHRIMPF, RD GALLOWAY, KF TITUS, JL WHEATLEY, CF TI A CONCEPTUAL-MODEL OF SINGLE-EVENT GATE-RUPTURE IN POWER MOSFETS SO IEEE TRANSACTIONS ON NUCLEAR SCIENCE LA English DT Article; Proceedings Paper CT IEEE 30th Annual International Nuclear and Space Radiation Effects Conference (NSREC) CY JUL 19-23, 1993 CL SNOWBIRD, UT SP IEEE, NUCL & PLASMA SCI SOC, RADIAT EFFECTS COMM, US DEPT DEF, DEF NUCL AGCY, US DEF ENERGY ENERGY, SANDIA NATL LAB, NASA, JET PROPULS LAB ID CHARGE AB A physical model of hole-collection following a heavy-ion strike is proposed to explain the development of oxide fields sufficient to cause single-event gate rupture in power MOSFET's. It is found that the size of the maximum field and the time at which it is attained are strongly affected by the hole mobility. C1 USN,CTR SURFACE WARFARE,CRANE DIV,CRANE,IN 47522. RP BREWS, JR (reprint author), UNIV ARIZONA,DEPT ELECT & COMP ENGN,TUCSON,AZ 85721, USA. RI Schrimpf, Ronald/L-5549-2013 OI Schrimpf, Ronald/0000-0001-7419-2701 NR 10 TC 53 Z9 54 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 0018-9499 J9 IEEE T NUCL SCI JI IEEE Trans. Nucl. Sci. PD DEC PY 1993 VL 40 IS 6 BP 1959 EP 1966 DI 10.1109/23.273457 PN 1 PG 8 WC Engineering, Electrical & Electronic; Nuclear Science & Technology SC Engineering; Nuclear Science & Technology GA MV375 UT WOS:A1993MV37500092 ER PT J AU FREUND, HP VANDERPLAATS, NR KODIS, MA AF FREUND, HP VANDERPLAATS, NR KODIS, MA TI FIELD-THEORY OF A TRAVELING-WAVE TUBE AMPLIFIER WITH A TAPE HELIX SO IEEE TRANSACTIONS ON PLASMA SCIENCE LA English DT Article AB A self-consistent relativistic field theory of a helix traveling wave tube (TWT) is presented for a configuration in which a magnetized pencil beam propagates through a tape helix enclosed with a loss-free wall. A linear analysis of the interaction is solved subject to the boundary conditions imposed by the beam, helix, and wall. The wave equation for the fields within the electron beam corresponds to the Appleton-Hartree magnetoionic wave modes that are of mixed electrostatic/electromagnetic polarization. Hence, the determinantal dispersion equation that is obtained implicitly includes beam space-charge effects without recourse to a heuristic model of the space-charge field. This dispersion equation includes azimuthal variations and all spatial harmonics of the tape helix. Solutions are found numerically, which correspond to both the extraordinary (X) and ordinary (O) solutions for the Appleton-Hartree modes. Note that the O- and X-mode designations are more properly applied for waves propagating perpendicular to the ambient magnetic field in a uniform plasma. In the present case, we are interested in the modes propagating parallel to the ambient magnetic field in a bounded system in which an electron beam is enclosed by a tape helix and a conducting wall. Hence, our use of this nomenclature is merely for convenience in designating the specific mode of solution of the dispersion equation. With this in mind, each solution is found to behave quite differently with variations in the axial magnetic field. For example, maximum gain of the X(O)-mode is found to increase (decrease) with the axial field up to the point at which the axial field suppresses the transverse electron motion, and to remain relatively constant thereafter. A detailed numerical example is shown corresponding to an experiment in progress at the Naval Research Laboratory. C1 USN,RES LAB,VACUUM ELECTR BRANCH,WASHINGTON,DC 20375. RP FREUND, HP (reprint author), SCI APPLICAT INT CORP,MCLEAN,VA 22102, USA. NR 22 TC 37 Z9 38 U1 0 U2 7 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0093-3813 J9 IEEE T PLASMA SCI JI IEEE Trans. Plasma Sci. PD DEC PY 1993 VL 21 IS 6 BP 654 EP 668 DI 10.1109/27.256785 PG 15 WC Physics, Fluids & Plasmas SC Physics GA MQ941 UT WOS:A1993MQ94100006 ER PT J AU PECHT, MG AGARWAL, R QUEARRY, D AF PECHT, MG AGARWAL, R QUEARRY, D TI PLASTIC PACKAGED MICROCIRCUITS - QUALITY, RELIABILITY, AND COST ISSUES SO IEEE TRANSACTIONS ON RELIABILITY LA English DT Article DE PLASTIC ENCAPSULATED MICROCIRCUIT AB Plastic encapsulated microcircuits (PEMs) find their main application in commercial and telecommunication electronics. The advantages of PEMs in cost, size, weight, performance, and market lead-time, have attracted 97% of the market share of worldwide microcircuit sales. However, PEMs have always been resisted in US Government and military applications due to the perception that PEM reliability is low. This paper surveys plastic packaging with respect to the issues of reliability, market lead-time, performance, cost, and weight as a means to guide part-selection and system-design. C1 DELCO ELECTR,KOKOMO,IN 46904. USN,CTR SURFACE WARFARE,CRANE,IN 47522. RP PECHT, MG (reprint author), UNIV MARYLAND,CALCE ELECTR PACKAGING RES CTR,COLLEGE PK,MD 20742, USA. OI Pecht, Michael/0000-0003-1126-8662 NR 18 TC 14 Z9 14 U1 0 U2 0 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0018-9529 J9 IEEE T RELIAB JI IEEE Trans. Reliab. PD DEC PY 1993 VL 42 IS 4 BP 513 EP 517 DI 10.1109/24.273569 PG 5 WC Computer Science, Hardware & Architecture; Computer Science, Software Engineering; Engineering, Electrical & Electronic SC Computer Science; Engineering GA NE255 UT WOS:A1993NE25500001 ER PT J AU MALIK, A GROSS, M ULRICH, T HOFFMAN, SL AF MALIK, A GROSS, M ULRICH, T HOFFMAN, SL TI INDUCTION OF CYTOTOXIC T-LYMPHOCYTES AGAINST THE PLASMODIUM-FALCIPARUM CIRCUMSPOROZOITE PROTEIN BY IMMUNIZATION WITH SOLUBLE RECOMBINANT PROTEIN WITHOUT ADJUVANT SO INFECTION AND IMMUNITY LA English DT Article ID MALARIA; CELL; VACCINE; MICE; YOELII AB Immunization of mice with irradiated malaria sporozoites induces protection that is dependent on CD8(+) T cells, and adoptive transfer of CD8(+) cytotoxic T lymphocyte (CTL) clones against rodent malaria circumsporozoite (CS) protein and sporozoite surface protein 2 completely protects against sporozoite challenge. Thus, there are now efforts to develop vaccines that induce CTL against the CS protein and sporozoite surface protein 2. Until recently, it was thought that induction of CTL required production of target proteins within cells, breakdown of the proteins to peptides in the cytoplasm, and transport of the peptides to the cell surface in combination with class I major histocompatibility complex molecules. It has now been shown that immunization with peptides in Freund's complete adjuvant and with soluble protein in liposomes can induce CTL. To determine whether we could induce CTL against the Plasmodium falciparum CS protein by immunization with soluble protein, B10.BR mice were immunized intravenously, intraperitoneally, or intramuscularly with a recombinant P. falciparum CS protein called RLF mixed with the adjuvant DETOX (monophosphoryl lipid A, cell wall skeleton of Mycobacteria phlei, and squalane). Two weeks after the last dose, spleen cells from mice immunized intravenously, but not intraperitoneally or intramuscularly, had peptide-specific, major histocompatibility complex-restricted, CD8(+) T-cell-dependent cytolytic activity against peptide 368-390 from the 7G8 P. falciparum CS protein. To determine whether the adjuvant was required for induction of the cytolytic activity, mice were immunized with RLF without adjuvant, and similar cytolytic activity was demonstrated. The finding that we could induce CTL by administration of soluble protein without adjuvant markedly broadens the possibilities for vaccinologists working to develop methods of inducing CTL in humans. C1 HENRY M JACKSON FDN ADVANCEMENT MIL MED,ROCKVILLE,MD 20852. SMITHKLINE BEECHAM PHARMACEUT CO,DEPT MACROMOLEC SCI L47,KING OF PRUSSIA,PA 19406. RIBI IMMUNOCHEM RES INC,INFECT DIS RES,HAMILTON,MT 59840. RP MALIK, A (reprint author), USN,MED RES INST,MALARIA PROGRAM,BETHESDA,MD 20889, USA. NR 17 TC 17 Z9 17 U1 0 U2 1 PU AMER SOC MICROBIOLOGY PI WASHINGTON PA 1325 MASSACHUSETTS AVENUE, NW, WASHINGTON, DC 20005-4171 SN 0019-9567 J9 INFECT IMMUN JI Infect. Immun. PD DEC PY 1993 VL 61 IS 12 BP 5062 EP 5066 PG 5 WC Immunology; Infectious Diseases SC Immunology; Infectious Diseases GA MH823 UT WOS:A1993MH82300018 PM 8225583 ER PT J AU BROOK, I TOM, SP LEDNEY, GD AF BROOK, I TOM, SP LEDNEY, GD TI QUINOLONE AND GLYCOPEPTIDE THERAPY FOR INFECTION IN MOUSE FOLLOWING EXPOSURE TO MIXED-FIELD NEUTRON-GAMMA-PHOTON RADIATION SO INTERNATIONAL JOURNAL OF RADIATION BIOLOGY LA English DT Article ID CANDIDA-ALBICANS; OFLOXACIN; IRRADIATION; VANCOMYCIN; MICE; DISSEMINATION; COLONIZATION; PREVENTION; SEPSIS AB The effects of increased doses of mixed-field neutron-gamma-photon irradiation on bacterial translocation and subsequent sepsis, and the influence of antimicrobial therapy on these events, were studied in the C3H/HeN mouse. Animals were given 4.25, 4.50, 4.75, 5.00 and 5.25 Gy of mixed-field [n/(n+gamma) = 0.7] radiation. The mortality rate of mice and recovery of bacteria were directly related to the radiation dose. Enterobacteriaceae were mostly isolated from the livers of mice exposed to 5.00 and 5.25 Gy, and aerobic Gram-positive cocci were recovered from those exposed to 4.50 and 4.75 Gy. Oral therapy with L-ofloxacin reduced mortality of all groups of animals except those given 4.25 and 4.50 Gy. This reduction was associated with a decrease in the number of the recovered Enterobacteriaceae. However, the number of Gram-positive cocci was unaffected. Addition of i.m. glycopeptide therapy failed to prevent Gram-positive coccal infection, due to the development of glycopeptide-resistant Enterococcus faecalis. These data demonstrate a relationship between the doses of mixed-field radiation and the rates of infection due to Enterobacteriaceae. While L-ofloxacin therapy reduces the infection rate, prolongs survival and prevents mortality, the addition of a glycopeptide can enhance systemic infection by resistant bacteria in the irradiated host. C1 ARMED FORCES RADIOBIOL RES INST,DEPT EXPTL HEMATOL,WOUND INFECT MANAGEMENT PROGRAM,BETHESDA,MD 20814. RP BROOK, I (reprint author), USN,MED RES INST,BETHESDA,MD 20889, USA. NR 20 TC 5 Z9 5 U1 0 U2 0 PU TAYLOR & FRANCIS LTD PI LONDON PA ONE GUNDPOWDER SQUARE, LONDON, ENGLAND EC4A 3DE SN 0955-3002 J9 INT J RADIAT BIOL JI Int. J. Radiat. Biol. PD DEC PY 1993 VL 64 IS 6 BP 771 EP 777 DI 10.1080/09553009314552021 PG 7 WC Biology; Nuclear Science & Technology; Radiology, Nuclear Medicine & Medical Imaging SC Life Sciences & Biomedicine - Other Topics; Nuclear Science & Technology; Radiology, Nuclear Medicine & Medical Imaging GA MQ359 UT WOS:A1993MQ35900015 PM 7903345 ER PT J AU DRESSICK, WJ CALVERT, JM AF DRESSICK, WJ CALVERT, JM TI PATTERNING OF SELF-ASSEMBLED FILMS USING LITHOGRAPHIC EXPOSURE TOOLS SO JAPANESE JOURNAL OF APPLIED PHYSICS PART 1-REGULAR PAPERS BRIEF COMMUNICATIONS & REVIEW PAPERS LA English DT Article DE ELECTROLESS; FILMS; LITHOGRAPHY; METALLIZATION; MICROELECTRONICS; MONOLAYER; ORGANOSILANE; PALLADIUM; PATTERNING; UV PHOTOCHEMISTRY ID COPLANAR MOLECULAR ASSEMBLIES; DEEP UV PHOTOCHEMISTRY; MONOLAYER FILMS; CELL-ADHESION; SURFACES AB This paper presents an approach for fabricating surfaces with precise positional control of chemical functionalities at submicron resolutions using direct patterning of organosilane self-assembled monolayer films (SAFs) with lithographic exposure tools. Although the process is of general applicability, microelectronics applications are emphasized here. The suitability of monolayer SAFs for high resolution patterning is discussed and deep UV photochemical mechanisms for several classes of SAFs are presented. Selective electroless metallization of patterned SAFs provides sufficient plasma etch resistance and compatibility with current microelectronics processing technologies to allow fabrication of functioning Si MOSFET test structures. Unique features of the process, including an ability to utilize a variety of substrates and control metal film adhesion by judicious choice of the SAF, are discussed. RP DRESSICK, WJ (reprint author), USN, RES LAB, CTR BIOMOLEC SCI & ENGN CODE 6900, WASHINGTON, DC 20375 USA. NR 39 TC 153 Z9 153 U1 0 U2 13 PU JAPAN SOC APPLIED PHYSICS PI TOKYO PA KUDAN-KITA BUILDING 5TH FLOOR, 1-12-3 KUDAN-KITA, CHIYODA-KU, TOKYO, 102-0073, JAPAN SN 0021-4922 J9 JPN J APPL PHYS 1 JI Jpn. J. Appl. Phys. Part 1 - Regul. Pap. Brief Commun. Rev. Pap. PD DEC PY 1993 VL 32 IS 12B BP 5829 EP 5839 DI 10.1143/JJAP.32.5829 PG 11 WC Physics, Applied SC Physics GA MQ761 UT WOS:A1993MQ76100003 ER PT J AU HYAMS, KC PHILLIPS, IA TEJADA, A WIGNALL, FS ROBERTS, CR ESCAMILLA, J AF HYAMS, KC PHILLIPS, IA TEJADA, A WIGNALL, FS ROBERTS, CR ESCAMILLA, J TI 3-YEAR INCIDENCE STUDY OF RETROVIRAL AND VIRAL-HEPATITIS TRANSMISSION IN A PERUVIAN PROSTITUTE POPULATION SO JOURNAL OF ACQUIRED IMMUNE DEFICIENCY SYNDROMES AND HUMAN RETROVIROLOGY LA English DT Article DE HIV-1; HTLV-I; HTLV-II; HEPATITIS-B; HEPATITIS-C; PROSTITUTION ID HUMAN-IMMUNODEFICIENCY-VIRUS; SEXUAL TRANSMISSION; HTLV-I; RISK-FACTORS; INFECTION; PREVALENCE; TYPE-1 AB A Peruvian female prostitute population was evaluated over a 3-year period to determine the incidence and risk factors of retroviral and viral hepatitis transmission. At three survey periods, a questionnaire was administered and serum samples were obtained. A total of 966 subjects were studied, with 34% followed for 38 months, 22% followed for 18 months, and 44% evaluated just once. On initial evaluation, 3 (0.3%) had HIV-1 antibody, 170 (17.6%) had HTLV-I antibody, 578 (59.8%) had anti-HBc, and 7 (0.7%) had antibody to hepatitis C virus. The mean annual incidence of HTLV-I and hepatitis B infection was 1.6% and 4.7%, respectively. Univariate and logistic regression analysis of prevalence data indicated an association between sexual activity and HTLV-I and hepatitis B infection, but no independent risk factors were identified in cohort analysis. Parenteral risk factors were not associated with transmission, except for a small percentage of subjects who may have acquired hepatitis B infection from blood transfusions. These findings suggest that there is a high incidence of HTLV-I and hepatitis B infection from heterosexual contact in this female prostitute population. C1 USN,MED RES INST,BETHESDA,MD 20814. NAVAL MED RES INST DETACHMENT,LIMA,PERU. SERV VENEREAS CALLAO,LIMA,PERU. UNIV NACL MAYOR SAN MARCOS,LIMA,PERU. NAVAL MED RES UNIT 2,JAKARTA,INDONESIA. WALTER REED ARMY INST RES,SILVER SPRING,MD. NR 20 TC 13 Z9 15 U1 0 U2 2 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 DEC PY 1993 VL 6 IS 12 BP 1353 EP 1357 PG 5 WC Immunology; Infectious Diseases SC Immunology; Infectious Diseases GA MM128 UT WOS:A1993MM12800012 PM 7504724 ER PT J AU KELSO, JM SAMPSON, HA AF KELSO, JM SAMPSON, HA TI FOOD PROTEIN-INDUCED ENTEROCOLITIS TO CASEIN HYDROLYSATE FORMULAS SO JOURNAL OF ALLERGY AND CLINICAL IMMUNOLOGY LA English DT Note C1 USN,MED CTR,DEPT INTERNAL MED,DIV ALLERGY,SAN DIEGO,CA 92134. JOHNS HOPKINS UNIV,BALTIMORE,MD 21218. RP KELSO, JM (reprint author), USN,MED CTR,DEPT CLIN INVEST,SAN DIEGO,CA 92134, USA. RI Osborne, Nicholas/N-4915-2015 OI Osborne, Nicholas/0000-0002-6700-2284 FU NIAID NIH HHS [AI-24439] NR 5 TC 46 Z9 46 U1 0 U2 0 PU MOSBY-YEAR BOOK INC PI ST LOUIS PA 11830 WESTLINE INDUSTRIAL DR, ST LOUIS, MO 63146-3318 SN 0091-6749 J9 J ALLERGY CLIN IMMUN JI J. Allergy Clin. Immunol. PD DEC PY 1993 VL 92 IS 6 BP 909 EP 910 DI 10.1016/0091-6749(93)90069-R PG 2 WC Allergy; Immunology SC Allergy; Immunology GA ML893 UT WOS:A1993ML89300017 PM 8258625 ER PT J AU PEELER, DP AF PEELER, DP TI THE ART OF DISENGAGEMENT + 20TH-CENTURY AMERICAN PHOTOGRAPHY - WESTON,EDWARD, ADAMS,ANSEL SO JOURNAL OF AMERICAN STUDIES LA English DT Article RP PEELER, DP (reprint author), USN ACAD,DEPT HIST,ANNAPOLIS,MD 21402, USA. NR 38 TC 2 Z9 2 U1 0 U2 2 PU CAMBRIDGE UNIV PRESS PI NEW YORK PA 40 WEST 20TH STREET, NEW YORK, NY 10011-4211 SN 0021-8758 J9 J AM STUD JI J. Am. Stud. PD DEC PY 1993 VL 27 BP 309 EP 334 PN 3 PG 26 WC Humanities, Multidisciplinary SC Arts & Humanities - Other Topics GA MR228 UT WOS:A1993MR22800001 ER PT J AU MEYER, JR ARNOLD, DJ HOFFMAN, CA BARTOLI, FJ AF MEYER, JR ARNOLD, DJ HOFFMAN, CA BARTOLI, FJ TI ANISOTROPIC SCREENING AND IONIZED IMPURITY SCATTERING IN SEMICONDUCTOR SUPERLATTICES AND MULTIPLE-QUANTUM WELLS SO JOURNAL OF APPLIED PHYSICS LA English DT Article ID HGTE-CDTE SUPERLATTICES; ELECTRON-TRANSPORT; SUPER-LATTICES; MONTE-CARLO; MOBILITY; HETEROSTRUCTURES; HETEROJUNCTION; CONDUCTIVITY; LAYERS; LIMIT AB We present a general theoretical treatment of ionized impurity scattering in semiconductor superlattices. Employing an extension of the quasi-two-dimensional calculations of Stem and Howard to multi-well structures, we explicitly account for nonuniformity of the wavefunction distribution function, arbitrary dispersion relations, scattering by impurities in neighboring periods, and screening by electrons in neighboring wells. Interperiod phenomena are found to be quite significant whenever the screening length is comparable to or longer than the distance between the quantum wells. Calculated results are compared' with recent data for modulation-doped and setback-modulation-doped HgTe-CdTe superlattices. However, the discussion emphasizes general aspects of the problem rather than features specific to a particular system. RP MEYER, JR (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 34 TC 10 Z9 10 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 DEC 1 PY 1993 VL 74 IS 11 BP 6676 EP 6685 DI 10.1063/1.355338 PG 10 WC Physics, Applied SC Physics GA MJ712 UT WOS:A1993MJ71200032 ER PT J AU THOMPSON, PE DAVIS, JL YANG, MJ SIMONS, DS CHI, PH AF THOMPSON, PE DAVIS, JL YANG, MJ SIMONS, DS CHI, PH TI CONTROLLED P-TYPE AND N-TYPE DOPING OF HOMOEPITAXIALLY AND HETEROEPITAXIALLY GROWN INSB SO JOURNAL OF APPLIED PHYSICS LA English DT Article ID MOLECULAR-BEAM EPITAXY; GAAS; SI; IMPLANTATION; INAS1-XSBX; MBE AB The p- and n-type doping, with Be and Si, respectively, of InSb grown on InSb and GaAs substrates using molecular-beam epitaxy was investigated. Using secondary-ion-mass' spectrometry, an anomalous migration of Be toward the surface was observed for growth on InSb substrates when the substrate temperature exceeded 340-degrees-C. This migration was not observed for Be-doped InSb layers grown on GaAs substrates. This redistribution of dopants was also not observed for Si-doped InSb layers. The doping efficiency of Be in InSb was approximately one-half that measured for Be in GaAs. For the doping efficiency of Si in InSb to reach that for Si in GaAs, the substrate temperature had to be maintained at less-than-or-equal-to 340-degrees-C during growth. Using the low-temperature growth technique, Si delta-doped structures were grown which demonstrated two-dimensional electron gas behavior. C1 NATL INST STAND & TECHNOL,GAITHERSBURG,MD 20899. RP THOMPSON, PE (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 21 TC 16 Z9 16 U1 1 U2 6 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0021-8979 J9 J APPL PHYS JI J. Appl. Phys. PD DEC 1 PY 1993 VL 74 IS 11 BP 6686 EP 6690 DI 10.1063/1.355111 PG 5 WC Physics, Applied SC Physics GA MJ712 UT WOS:A1993MJ71200033 ER PT J AU CUKAUSKAS, EJ ALLEN, LH SHERRILL, GK HOLM, RT VOLD, C AF CUKAUSKAS, EJ ALLEN, LH SHERRILL, GK HOLM, RT VOLD, C TI MORPHOLOGY AND TRANSPORT OF YBA2CU3O7-X SPUTTERED IN ARGON, OXYGEN, AND HYDROGEN - DEPENDENCE ON DEPOSITION TEMPERATURE SO JOURNAL OF APPLIED PHYSICS LA English DT Article ID BA-CU-O; THIN-FILMS; CRITICAL CURRENTS; SUPERCONDUCTORS; INSITU; GROWTH; MGO AB YBa2Cu3O7-x films have been deposited on MgO by reactive, off-axis magnetron sputtering in an argon, oxygen, and hydrogen gas mixture. The material and electrical properties of the films were studied for deposition temperatures from 600 to 760-degrees-C. The films, all approximately 300 nm thick, were predominantly a-axis oriented when deposited at or below 620-degrees-C but were c-axis oriented when deposited at temperatures above 640-degrees-C. The surfaces of films deposited between 640 and 710-degrees-C were partially covered with a-axis grains. Surface roughness measurements indicated the smoothest films occurred for deposition temperatures below 680-degrees-C. Resistance ratios as great as 3.1 were observed for some films. Transition temperatures exceeded 89 K and resistivities at 100 K were less than 150 muOMEGA cm for the best films. Low-temperature critical current densities exceeded 10(7) A/cm2 for films deposited from 640 to 720-degrees-C. The temperature dependence of the critical current density near the transition temperature had a power law dependence of nearly 3/2 for deposition temperatures below 690-degrees-C. The power law dependence decreased for increasing deposition temperatures, dropping to nearly 1.1 in the film deposited at 750-degrees-C. RP CUKAUSKAS, EJ (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 30 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 0021-8979 J9 J APPL PHYS JI J. Appl. Phys. PD DEC 1 PY 1993 VL 74 IS 11 BP 6780 EP 6787 DI 10.1063/1.355077 PG 8 WC Physics, Applied SC Physics GA MJ712 UT WOS:A1993MJ71200047 ER PT J AU BOYD, JD LINZELL, RS AF BOYD, JD LINZELL, RS TI EVALUATION OF THE SPARTON TIGHT-TOLERANCE AXBT SO JOURNAL OF ATMOSPHERIC AND OCEANIC TECHNOLOGY LA English DT Note AB Forty-six near-simultaneous pairs of conductivity-temperature-depth (CTD) and Sparton ''tight tolerance'' air expendable bathythermograph (AXBT) temperature profiles were obtained in summer 1991 from a location in the Sargasso Sea. The data were analyzed to assess the temperature and depth accuracies of the Sparton AXBTs. The tight-tolerance criterion was not achieved using the manufacturer's equations but may have been achieved using customized equations computed from the CTD data. The temperature data from the customized equations had a one standard deviation error of 0.13-degrees-C. A customized elapsed fall time-to-depth conversion equation was found to be z = 1.620t - 2.2384 X 10(-4)t2 + 1.291 x 10(-7)t3, with z the depth in meters and t the elapsed fall time after probe release in seconds. The standard deviation of the depth error was about 5 m; a rule of thumb for estimating maximum bounds on the depth error below 100 m could be expressed as +/-2% of depth or +/-10 m, whichever is greater. This equation gave greater depth accuracy than either the manufacturer's supplied equation or the navy standard equation. RP BOYD, JD (reprint author), NAVAL RES LAB,CODE 7332,BAY ST LOUIS,MS 39529, USA. NR 0 TC 4 Z9 4 U1 0 U2 0 PU AMER METEOROLOGICAL SOC PI BOSTON PA 45 BEACON ST, BOSTON, MA 02108-3693 SN 0739-0572 J9 J ATMOS OCEAN TECH JI J. Atmos. Ocean. Technol. PD DEC PY 1993 VL 10 IS 6 BP 892 EP 899 DI 10.1175/1520-0426(1993)010<0892:EOTSTT>2.0.CO;2 PG 8 WC Engineering, Ocean; Meteorology & Atmospheric Sciences SC Engineering; Meteorology & Atmospheric Sciences GA MJ290 UT WOS:A1993MJ29000010 ER PT J AU FITZGERALD, JP AF FITZGERALD, JP TI CYCLOOCTANE CONFORMATIONAL-ANALYSIS VIA MECHANICAL AND COMPUTATIONAL MODELS SO JOURNAL OF CHEMICAL EDUCATION LA English DT Article ID MOLECULAR MECHANICS RP FITZGERALD, JP (reprint author), USN ACAD,ANNAPOLIS,MD 21402, USA. NR 8 TC 10 Z9 10 U1 1 U2 2 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 DEC PY 1993 VL 70 IS 12 BP 988 EP 990 PG 3 WC Chemistry, Multidisciplinary; Education, Scientific Disciplines SC Chemistry; Education & Educational Research GA MR250 UT WOS:A1993MR25000013 ER PT J AU GIORDANA, A GLEMBOCKI, OJ GLASER, ER GASKILL, DK KYONO, CS TWIGG, ME FATEMI, M TADAYON, B TADAYON, S AF GIORDANA, A GLEMBOCKI, OJ GLASER, ER GASKILL, DK KYONO, CS TWIGG, ME FATEMI, M TADAYON, B TADAYON, S TI CHARACTERIZATION OF CRYSTALLINE LOW-TEMPERATURE GAAS-LAYERS ANNEALED FROM AN AMORPHOUS PHASE SO JOURNAL OF ELECTRONIC MATERIALS LA English DT Article; Proceedings Paper CT Symposium on low temperature grown and higher nonstoichiometric GaAs and related materials, at the spring meeting of the Materials-Research-Society CY APR 12-13, 1993 CL SAN FRANCISCO, CA SP MAT RES SOC, USAF, OFF SCI RES DE LOW-TEMPERATURE-GROWN GAAS; MBE; TEM; XRD AB The results from an in-depth characterization of as-grown and annealed low-temperature GaAs layers deposited at less than 260 degrees C are presented. The layers, amorphous as grown, became crystalline after annealing. The crystallization was documented by several characterization techniques including photoreflectance, Raman spectroscopy, photoluminescence, transmission electron microscopy, and double-crystal x-ray diffraction. The n-type conductivity of the annealed films was exploited for the construction of a diode structure. C1 COMSAT LAB,CLARKSBURG,MD 20871. RP GIORDANA, A (reprint author), USN,RES LAB,CODE 6861,4555 OVERLOOK AVE SW,WASHINGTON,DC 20375, USA. NR 7 TC 11 Z9 11 U1 3 U2 5 PU MINERALS METALS MATERIALS SOC PI WARRENDALE PA 420 COMMONWEALTH DR, WARRENDALE, PA 15086 SN 0361-5235 J9 J ELECTRON MATER JI J. Electron. Mater. PD DEC PY 1993 VL 22 IS 12 BP 1391 EP 1393 DI 10.1007/BF02649983 PG 3 WC Engineering, Electrical & Electronic; Materials Science, Multidisciplinary; Physics, Applied SC Engineering; Materials Science; Physics GA MK808 UT WOS:A1993MK80800005 ER PT J AU KYONO, CS TADAYON, B TWIGG, ME GIORDANA, A SIMONS, DS FATEMI, M TADAYON, S AF KYONO, CS TADAYON, B TWIGG, ME GIORDANA, A SIMONS, DS FATEMI, M TADAYON, S TI DIODE STRUCTURES FROM AMORPHOUS LOW-TEMPERATURE GAAS SO JOURNAL OF ELECTRONIC MATERIALS LA English DT Article; Proceedings Paper CT Symposium on low temperature grown and higher nonstoichiometric GaAs and related materials, at the spring meeting of the Materials-Research-Society CY APR 12-13, 1993 CL SAN FRANCISCO, CA SP MAT RES SOC, USAF, OFF SCI RES DE ANNEALING; LOW-TEMPERATURE-GROWN GAAS; MBE ID MOLECULAR-BEAM EPITAXY; BUFFER; LAYERS AB The effect of annealing on the electrical properties of a GaAs diode structure, which incorporated a nominally undoped low-temperature (LT) layer on tap of conventionally grown p-type GaAs, is examined. Unannealed GaAs grown by molecular beam epitaxy at substrate temperatures below 250 degrees C is amorphous and highly resistive. Annealing at high temperatures converts the undoped LT-GaAs from amorphous to single crystal material. The annealed material is n-type. The current-voltage characteristics of the LT on p-type GaAs structures showed greater asymmetry, with lower reverse leakage currents, as the anneal temperature was increased above 400 degrees C. This reflects the improved crystal quality of the LT layer. C1 NATL INST STAND & TECHNOL,GAITHERSBURG,MD 20899. COMSAT LAB,CLARKSBURG,MD 20871. RP KYONO, CS (reprint author), USN,RES LAB,CODE 6856,WASHINGTON,DC 20375, USA. NR 17 TC 5 Z9 5 U1 1 U2 5 PU MINERALS METALS MATERIALS SOC PI WARRENDALE PA 420 COMMONWEALTH DR, WARRENDALE, PA 15086 SN 0361-5235 J9 J ELECTRON MATER JI J. Electron. Mater. PD DEC PY 1993 VL 22 IS 12 BP 1437 EP 1440 DI 10.1007/BF02649994 PG 4 WC Engineering, Electrical & Electronic; Materials Science, Multidisciplinary; Physics, Applied SC Engineering; Materials Science; Physics GA MK808 UT WOS:A1993MK80800016 ER PT J AU MICHAELS, RD SHAKIR, KMM AF MICHAELS, RD SHAKIR, KMM TI ASSOCIATION OF MULTINODULAR GOITER WITH BREAST-CARCINOMA - COWDENS-DISEASE SO JOURNAL OF ENDOCRINOLOGICAL INVESTIGATION LA English DT Note DE COWDENS DISEASE; MULTINODULAR GOITER; BREAST CARCINOMA ID HAMARTOMAS; POLYPOSIS AB Cowden's Disease or multiple hamartoma syndrome is an autosomal dominant genodermatosis associated with abnormalities of the breast, thyroid gland, gastrointestinal tract and genitourinary system. A large percentage of these patients have goiters or other thyroid abnormalities. Physicians should consider the diagnosis of Cowden's disease in patients presenting with thyroid disease and skin lesions such as papules or skin tags and if present these subjects should be screened for other malignancies associated with this disease. C1 USN,NATL MED CTR,DEPT INTERNAL MED,DIV ENDOCRINOL & METAB,BETHESDA,MD 20889. UNIFORMED SERV UNIV HLTH SCI,DEPT MED,BETHESDA,MD 20814. NR 8 TC 9 Z9 9 U1 0 U2 0 PU EDITRICE KURTIS S R L PI MILANO PA VIA LUIGI ZOJA, 30-20153 MILANO, ITALY SN 0391-4097 J9 J ENDOCRINOL INVEST JI J. Endocrinol. Invest. PD DEC PY 1993 VL 16 IS 11 BP 909 EP 911 PG 3 WC Endocrinology & Metabolism SC Endocrinology & Metabolism GA MR070 UT WOS:A1993MR07000011 PM 8144869 ER PT J AU LU, J GUPTA, AK KEATING, EL AF LU, J GUPTA, AK KEATING, EL TI EFFECT OF IC ENGINE OPERATING-CONDITIONS ON COMBUSTION AND EMISSION CHARACTERISTICS SO JOURNAL OF FLUIDS ENGINEERING-TRANSACTIONS OF THE ASME LA English DT Article ID SPEEDS AB Numerical simulation of flow, combustion, heat release rate, and pollutants emission characteristics have been obtained using a single cylinder internal combustion engine operating with propane as the fuel. The data show that for good agreement with experimental results on the peak pressure and the rate of pressure rise as a function of crank angle, spark ignition energy and local cylinder pressure must be properly modeled. The results obtained for NO and CO showed features which are qualitatively in good agreement and are similar to those reported in the literature for the chosen combustion chamber geometry. The results have shown that both the combustion chamber geometry and engine operating parameters affects the flame growth within the combustion chamber which subsequently affects the pollutants emission levels. The code employed the time marching procedure and solves the governing partial differential equations of multicomponent chemically reacting fluid flow by finite difference method. The numerical results provide a cost effective means of developing advanced internal combustion engine chamber geometry design that provides high efficiency and low pollution levels. It is expected that increased computational tools will be used in the future for enhancing our understanding of the detailed combustion process in internal combustion engines and all other energy conversion systems. Such detailed information is critical for the development of advanced methods for energy conservation and environmental pollution control. C1 USN,CTR SURFACE WARFARE,ANNAPOLIS,MD 21402. RP LU, J (reprint author), UNIV MARYLAND,DEPT MECH ENGN,COLL PK,MD 20742, USA. NR 16 TC 1 Z9 1 U1 0 U2 1 PU ASME-AMER SOC MECHANICAL ENG PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 SN 0098-2202 J9 J FLUID ENG-T ASME JI J. Fluids Eng.-Trans. ASME PD DEC PY 1993 VL 115 IS 4 BP 694 EP 701 DI 10.1115/1.2910201 PG 8 WC Engineering, Mechanical SC Engineering GA MR520 UT WOS:A1993MR52000026 ER PT J AU LANGSTON, LS KASPER, RG AF LANGSTON, LS KASPER, RG TI ANALYSIS OF AN ELECTROMAGNETIC BOUNDARY-LAYER PROBE FOR LOW MAGNETIC REYNOLDS-NUMBER FLOWS SO JOURNAL OF FLUIDS ENGINEERING-TRANSACTIONS OF THE ASME LA English DT Article ID FLOWMETERS AB Electromagnetic (EM) flow meters are used to measure volume flow rates of electrically conductive fluids (e.g., low magnetic Reynolds number flows of seawater, milk, etc.) in pipe flows. The possibility of using a modified form of EM flow meter to nonobtrusively measure boundary-layer flow characteristics is analytically investigated in this paper. The device, named an electromagnetic boundary layer (EBL) probe, would have a velocity integral-dependent voltage induced between parallel wall-mounted electrodes, as a conductive fluid flows over a dielectric wall and through the probe's magnetic field. The Shercliff-Bevir integral equation, taken from EM flow meter theory and design, is used as the basis of the analytical model for predicting EBL probe voltage outputs, given a specified probe geometry and boundary layer flow conditions. Predictions are made of the effective range of the nonobtrusive EBL probe in terms of electrode dimensions, the magnetic field size and strength, and boundary layer velocity profile and thickness. The analysis gives expected voltage calibration curves and shows that an array of paired electrodes would be a beneficial feature for probe design. A key result is that the EBL probe becomes a displacement thickness meter, if operated under certain conditions. That is, the output voltage was found to be directly proportional to the boundary layer displacement thickness, delta1, for a given free stream velocity. C1 USN,CTR UNDERSEA WARFARE,DETACHMENT NEW LONDON,NEW LONDON,CT 06320. RP LANGSTON, LS (reprint author), UNIV CONNECTICUT,DEPT MECH ENGN,STORRS,CT 06269, USA. NR 8 TC 2 Z9 2 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 DEC PY 1993 VL 115 IS 4 BP 726 EP 731 DI 10.1115/1.2910205 PG 6 WC Engineering, Mechanical SC Engineering GA MR520 UT WOS:A1993MR52000030 ER PT J AU BANDYOPADHYAY, PR AF BANDYOPADHYAY, PR TI FURTHER EXPERIMENTS ON TRANSITION TO TURBULENCE IN CONSTANT ACCELERATION PIPE-FLOW SO JOURNAL OF FLUIDS ENGINEERING-TRANSACTIONS OF THE ASME LA English DT Discussion RP BANDYOPADHYAY, PR (reprint author), USN,DIV UNDERSEA WARFARE CTR,CODE 8233,NEWPORT,RI 02841, USA. NR 2 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 DEC PY 1993 VL 115 IS 4 BP 784 EP 784 DI 10.1115/1.2910214 PG 1 WC Engineering, Mechanical SC Engineering GA MR520 UT WOS:A1993MR52000039 ER PT J AU LAMPE, M AF LAMPE, M TI MODELING AND CHARACTERIZATION OF ETCHING IN ELECTRON-CYCLOTRON-RESONANCE PLASMA REACTORS SO JOURNAL OF FUSION ENERGY LA English DT Article; Proceedings Paper CT Fusion-Power-Associates Symposium on Near-Term Applications of Fusion and Plasma Technologies CY OCT 05-07, 1993 CL OAK RIDGE, TN SP FUS POWER ASSOC RP LAMPE, M (reprint author), USN,RES LAB,DIV PLASMA PHYS,WASHINGTON,DC 20375, USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU PLENUM PUBL CORP PI NEW YORK PA 233 SPRING ST, NEW YORK, NY 10013 SN 0164-0313 J9 J FUSION ENERG JI J. Fusion Energy PD DEC PY 1993 VL 12 IS 4 BP 403 EP 404 DI 10.1007/BF01054828 PG 2 WC Nuclear Science & Technology SC Nuclear Science & Technology GA NW971 UT WOS:A1993NW97100020 ER PT J AU YUI, K ISHIDA, Y KATSUMATA, M KOMORI, S CHUSED, TM ABE, R AF YUI, K ISHIDA, Y KATSUMATA, M KOMORI, S CHUSED, TM ABE, R TI 2 SEPARATE MECHANISMS OF T-CELL CLONAL ANERGY TO MLS-1(A) SO JOURNAL OF IMMUNOLOGY LA English DT Article ID MAJOR HISTOCOMPATIBILITY COMPLEX; V-BETA-8.1 TRANSGENIC MICE; MONOCLONAL-ANTIBODY; ANTIGEN RECEPTOR; SELF-TOLERANCE; NEGATIVE SELECTION; MOLECULAR EVENTS; DELETION; REACTIVITY; DIFFERENTIATION AB T cell tolerance to superantigen can be mediated by clonal anergy in which Ag-specific mature T cells are physically present but are not able to mount an immune response. We induced T cell unresponsiveness to minor lymphocyte stimulations locus antigen (Mls)-1a in mice transgenic for TCR Vbeta8.1 in three different systems: 1) injection of Mls-1a spleen cells, 2) mating with Mls-1a mice, and 3) bone marrow (BM) chimeras in which Mls-1a is present only on nonhematopoietic cells. CD4+8-Vbeta8.1+ cells from all these groups did not proliferate in response to irradiated spleen cells from Mls-1a mice. We compared the response of these cells by T cell/stimulator cell conjugate formation, Ca2+ mobilization, and proliferation assays. The mechanisms underlying the unresponsiveness of these T cells appear to differ. CD4+8-Vbeta8.1+ cells from Mls-1a spleen cell-injected mice mobilized cytoplasmic Ca2+ but proliferated at a reduced level in response to cross-linking with anti-TCR mAb. However, these cells formed conjugates, mobilized Ca2+, and proliferated in response to MlS-1a when activated B cells were used as stimulators, although they produced reduced levels of IL-2. In Mls-1a/b Vbeta8.1 transgenic mice, a subset in CD4+8-Vbeta8.1+ cells did not mobilize cytoplasmic Ca2+ after TCR cross-linking. Their conjugate formation, Ca2+ mobilization, or proliferation in response to Mls-1a on activated B cells was undetectable. Finally, CD4+8-Vbeta8.1+ cells from the BM chimeras proliferated to TCR cross-linking at a partially reduced level and formed conjugates, mobilized Ca2+, and proliferated in response to Mls-1a on activated B cells. These features suggest that the mechanisms underlying the maintenance of anergy in Mls-1a spleen cell-injected mice are distinct from those in Mls-1a mice. C1 UNIV PENN,DEPT PATHOL & LAB MED,DIV IMMUNOL,PHILADELPHIA,PA 19104. NIAID,IMMUNOL LAB,ROCKVILLE,MD 20852. NCI,EXPTL IMMUNOL BRANCH,BETHESDA,MD 20892. USN,MED RES INST,IMMUNE CELL BIOL PROGRAM,BETHESDA,MD 20889. NR 44 TC 13 Z9 13 U1 0 U2 0 PU AMER ASSOC IMMUNOLOGISTS PI BETHESDA PA 9650 ROCKVILLE PIKE, BETHESDA, MD 20814 SN 0022-1767 J9 J IMMUNOL JI J. Immunol. PD DEC 1 PY 1993 VL 151 IS 11 BP 6062 EP 6075 PG 14 WC Immunology SC Immunology GA MH756 UT WOS:A1993MH75600020 PM 8245451 ER PT J AU QARI, SH SHI, YP POVOA, MM ALPERS, MP DELORON, P MURPHY, GS HARJOSUWARNO, S LAL, AA AF QARI, SH SHI, YP POVOA, MM ALPERS, MP DELORON, P MURPHY, GS HARJOSUWARNO, S LAL, AA TI GLOBAL OCCURRENCE OF PLASMODIUM-VIVAX-LIKE HUMAN MALARIA PARASITE SO JOURNAL OF INFECTIOUS DISEASES LA English DT Article ID CIRCUMSPOROZOITE PROTEIN GENE; T-CELL EPITOPES; FALCIPARUM; POLYMORPHISM; VARIANT AB A Plasmodium vivax-like human malaria parasite was recently identified from Madang, a holoendemic malarious region in Papua New Guinea. The complete nucleotide sequence of the circumsporozoite (CS) protein gene of this parasite is presented here. The CS protein of this parasite has an 11-mer repeat sequence and is different from the other known CS protein genes of human malaria parasites. However, it is identical to the CS protein gene of a monkey malaria parasite, Plasmodium simiovale. This P. vivax-like malaria parasite was found in Sepik, another malarious region of Papua New Guinea, and in Brazil, Indonesia, and Madagascar. No pure isolate of this parasite was identified. Specific oligonucleotide probes were used to determine relative proportion of the P. vivax-like parasite in P. vivax (type 1 and type 2) mixed field isolates. Compared with P. vivax or Plasmodium falciparum, the circumsporozoite protein of P. vivax-like parasites showed markedly less polymorphism. C1 USN HOSP,DEPT INTERNAL MED,SAN DIEGO,CA 92134. CHAGAS INST,MALARIA PROGRAM,BELEM,BRAZIL. PAPUA NEW GUINEA INST MED RES,GOROKHA,PAPUA N GUINEA. HOP CLAUDE BERNARD,INSERM,U13,F-75994 PARIS 19,FRANCE. MINIST HLTH REPUBL INDONESIA,JAYAPURA,INDONESIA. RP QARI, SH (reprint author), CTR DIS CONTROL & PREVENT,DIV PARASIT DIS,MALARIA BRANCH,4770 BUFORD HIGHWAY,ATLANTA,GA 30341, USA. RI Deloron, Philippe/G-6305-2010 FU NIAID NIH HHS [1-Y02-AI-00006-01] NR 23 TC 29 Z9 31 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 DEC PY 1993 VL 168 IS 6 BP 1485 EP 1489 PG 5 WC Immunology; Infectious Diseases; Microbiology SC Immunology; Infectious Diseases; Microbiology GA MJ709 UT WOS:A1993MJ70900022 PM 8245533 ER PT J AU LAMBRAKOS, SG METZBOWER, EA MOORE, PG DUNN, JH MONIS, A AF LAMBRAKOS, SG METZBOWER, EA MOORE, PG DUNN, JH MONIS, A TI A NUMERICAL-MODEL FOR DEEP PENETRATION WELDING PROCESSES SO JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE LA English DT Article; Proceedings Paper CT Session 2: Failure Analysis and Reliability, at the ASM Materials Week CY 1992 CL CHICAGO, IL SP AMER SOC MET INT DE NUMERICAL MODELING; KEYHOLE STIRRING; DEEP PENETRATION; PARTITIONING AB The general features of a numerical model, and of its extensions, for calculating the temperature and fluid velocity field in a three-dimensional workpiece undergoing deep penetration laser beam welding are described. In the current model, the deposition of power from the beam is represented by time-dependent boundary conditions on the equations of energy and momentum transfer. These boundary conditions are specified at each timestep on a surface whose configuration can change with time and upon which energy is deposited according to a specified power distribution. This model also includes the effects of the buoyancy force on the melt pool and of the surface tension gradient on the surface of the fluid. The coupled equations of energy, momentum transfer, and continuity combined with the time-dependent boundary conditions representing the keyhole and the moving boundaries of the workpiece are solved by using a specific implementation of the SIMPLE algorithm. The important features of the numerical methods used in the model are discussed. Isotherms and convection patterns calculated using the current model are presented, and their significance for predicting weldment properties is discussed. A significant result of the simulations is that they demonstrate the overwhelming influence of the keyhole vapor/liquid interface on fluid convection and conduction in deep penetration welding. C1 UNIV MARYLAND,COLL PK,MD. RP LAMBRAKOS, SG (reprint author), USN,RES LAB,CODE 6324,WASHINGTON,DC 20375, USA. NR 13 TC 8 Z9 8 U1 1 U2 1 PU ASM INTERNATIONAL PI MATERIALS PARK PA SUBSCRIPTIONS SPECIALIST CUSTOMER SERVICE, MATERIALS PARK, OH 44073-0002 SN 1059-9495 J9 J MATER ENG PERFORM JI J. Mater. Eng. Perform. PD DEC PY 1993 VL 2 IS 6 BP 819 EP 838 DI 10.1007/BF02645682 PG 20 WC Materials Science, Multidisciplinary SC Materials Science GA MT843 UT WOS:A1993MT84300005 ER PT J AU PORCH, D AF PORCH, D TI THE AGE OF BATTLES - THE QUEST FOR DECISIVE WARFARE FROM BREITENFELD TO WATERLOO - WEIGLEY,RF SO JOURNAL OF MODERN HISTORY LA English DT Book Review RP PORCH, D (reprint author), USN,WAR COLL,WASHINGTON,DC, USA. NR 1 TC 0 Z9 0 U1 0 U2 0 PU UNIV CHICAGO PRESS PI CHICAGO PA 5720 S WOODLAWN AVE, CHICAGO, IL 60637 SN 0022-2801 J9 J MOD HIST JI J. Mod. Hist. PD DEC PY 1993 VL 65 IS 4 BP 820 EP 822 DI 10.1086/244730 PG 3 WC History SC History GA MM549 UT WOS:A1993MM54900020 ER PT J AU CARTER, WH AF CARTER, WH TI A STUDY OF THE PROPAGATION OF OPTICAL-SPECTRA USING A WAVELENGTH INDEPENDENT FORMULATION OF DIFFRACTION THEORY AND COHERENCE THEORY SO JOURNAL OF MODERN OPTICS LA English DT Article ID FREQUENCY-SHIFTS; PLANAR SOURCES; LINES; REDSHIFTS; LIGHT AB Basic relations in diffraction theory and coherence theory are rederived in spatial coordinates in units of a wavelength for each monochromatic component of the field. It is found that each component behaves identically in these coordinates independent of wavelength. This theory makes it clear that there is an intrinsic spectral shift that always occurs for any deterministic field as it propagates from a region near its sources into the far field. This theory also leads to a set of special conditions under which a partially coherent field has the same spectrum over a plane near its sources and also at every point in its far field. These conditions are believed to be satisfied by the fields radiated by natural thermal sources. Equations are given describing the relationships between the spectra of the source, the field near the source, and the radiation field under a wide range of conditions. RP CARTER, WH (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 15 TC 3 Z9 3 U1 0 U2 0 PU TAYLOR & FRANCIS LTD PI LONDON PA ONE GUNDPOWDER SQUARE, LONDON, ENGLAND EC4A 3DE SN 0950-0340 J9 J MOD OPTIC JI J. Mod. Opt. PD DEC PY 1993 VL 40 IS 12 BP 2433 EP 2449 DI 10.1080/09500349314552451 PG 17 WC Optics SC Optics GA MN281 UT WOS:A1993MN28100013 ER PT J AU HIGBY, PL AGGARWAL, ID AF HIGBY, PL AGGARWAL, ID TI PROPERTIES OF BARIUM GALLIUM GERMANATE GLASSES SO JOURNAL OF NON-CRYSTALLINE SOLIDS LA English DT Article ID GALLIOSILICATE GLASSES; THERMAL-EXPANSION; VISCOSITY; GALLOSILICATE; SPECTRA AB The glass-forming region density, index of refraction, glass transition temperature, T(g), chemical durability and viscosity of BaO-Ga2O3-GeO2 (BGG) glasses have been determined. In general, the physical properties of these ternary germanate glasses behave in a similar manner to comparable silicate glasses. Three series of BGG glasses containing a constant Ga2O3 content were formulated to approximate the physical property behavior of alkaline earth germanate glasses. The molar volume of the glasses in these series passes through a minimum with increasing BaO content, indicating a maximum in packing density and therefore the possibility of the existence of six-coordinated germanium ions. C1 USN,RES LAB,WASHINGTON,DC 20375. NR 22 TC 46 Z9 47 U1 0 U2 14 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0022-3093 J9 J NON-CRYST SOLIDS JI J. Non-Cryst. Solids PD DEC PY 1993 VL 163 IS 3 BP 303 EP 308 DI 10.1016/0022-3093(93)91308-P PG 6 WC Materials Science, Ceramics; Materials Science, Multidisciplinary SC Materials Science GA MH999 UT WOS:A1993MH99900012 ER PT J AU GOINS, B KLIPPER, R RUDOLPH, AS CLIFF, RO BLUMHARDT, R PHILLIPS, WT AF GOINS, B KLIPPER, R RUDOLPH, AS CLIFF, RO BLUMHARDT, R PHILLIPS, WT TI BIODISTRIBUTION AND IMAGING STUDIES OF TC-99M-LABELED LIPOSOMES IN RATS WITH FOCAL INFECTION SO JOURNAL OF NUCLEAR MEDICINE LA English DT Article ID ENCAPSULATED HEMOGLOBIN; BLOOD SUBSTITUTE; TC-99M-LABELED LIPOSOME; PROLONGED CIRCULATION; INFLAMMATORY LESIONS; POLYCLONAL IGG; GA-67 CITRATE; INVIVO; IMMUNOGLOBULIN; LOCALIZATION AB We have recently developed a procedure to label liposomes containing reduced glutathione (GSH) with (TC)-T-99m using the lipophilic chelator, hexamethylpropyleneamine oxime (HMPAO). In the present study, we evaluated the use of Tc-99m-liposomes to detect focal infection sites in rats. Rats were infected in the thigh by intramuscular injection with Staphylococcus aureus followed 24 hr later by an intravenous injection of Tc-99m-liposomes, Ga-67-citrate, or Tc-99m-human serum albumin (HSA). The animals were imaged under a gamma camera and subsequently killed at 4, 24 or 48 hr for tissue biodistribution studies. In contrast to infected rats receiving Ga-67-citrate or Tc-99m-HSA, abscesses were prominently localized within 2 hr in rats after Tc-99m-liposome injection, and continued to increase in activity up to 24 hr. Abscess-to-muscle ratios calculated from 24-hr biodistribution data obtained from tissue sampling were 35.3 +/- 7.6 for (TC)-T-99m-liposomes, 4.1 +/- 0.7 for Ga-67-citrate and 8.0 +/- 1.0 for Tc-99m-HSA. These studies show the potential of using Tc-99m-liposomes to localize infection. C1 UNIV TEXAS,HLTH SCI CTR,DEPT RADIOL,SAN ANTONIO,TX 78284. NAVAL RES LAB,CTR BIOMOLEC SCI & ENGN,WASHINGTON,DC. RI Goins, Beth/F-1311-2010; Phillips, William/E-8427-2010 OI Phillips, William/0000-0001-8248-7817 NR 48 TC 57 Z9 57 U1 0 U2 0 PU SOC NUCLEAR MEDICINE INC PI RESTON PA 1850 SAMUEL MORSE DR, RESTON, VA 20190-5316 SN 0161-5505 J9 J NUCL MED JI J. Nucl. Med. PD DEC PY 1993 VL 34 IS 12 BP 2160 EP 2168 PG 9 WC Radiology, Nuclear Medicine & Medical Imaging SC Radiology, Nuclear Medicine & Medical Imaging GA MK579 UT WOS:A1993MK57900028 PM 8254404 ER PT J AU MCGILL, TW DOWNEY, EC WESTBROOK, J WADE, D DELAGARZA, J AF MCGILL, TW DOWNEY, EC WESTBROOK, J WADE, D DELAGARZA, J TI GASTRIC-CARCINOMA IN CHILDREN SO JOURNAL OF PEDIATRIC SURGERY LA English DT Note DE GASTRIC CARCINOMA; PEPTIC ULCER DISEASE, PEDIATRIC ID ESOPHAGEAL ADENOCARCINOMA; JUNCTION C1 USN HOSP,DEPT SURG,SAN DIEGO,CA 92120. KAISER HOSP,DEPT SURG,SAN DIEGO,CA. KAISER HOSP,DEPT PEDIAT SURG,SAN DIEGO,CA. NR 15 TC 28 Z9 31 U1 0 U2 0 PU W B SAUNDERS CO PI PHILADELPHIA PA INDEPENDENCE SQUARE WEST CURTIS CENTER, STE 300, PHILADELPHIA, PA 19106-3399 SN 0022-3468 J9 J PEDIATR SURG JI J. Pediatr. Surg. PD DEC PY 1993 VL 28 IS 12 BP 1620 EP 1621 DI 10.1016/0022-3468(93)90120-A PG 2 WC Pediatrics; Surgery SC Pediatrics; Surgery GA ML662 UT WOS:A1993ML66200035 PM 8301513 ER PT J AU MINTMIRE, JW ROBERTSON, DH WHITE, CT AF MINTMIRE, JW ROBERTSON, DH WHITE, CT TI PROPERTIES OF FULLERENE NANOTUBULES SO JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS LA English DT Article DE FULLERENE; TUBULE; ELECTRONIC STRUCTURE ID ELECTRONIC-STRUCTURE; GRAPHENE TUBULES; CARBON; POLYACETYLENE; C-60; MICROTUBULES AB Recent reports show that single graphitic tubules with diameters on the order of fullerene diameters have been synthesized. We have examined both the electronic and structural properties of these materials using a range of methods. We have calculated the electronic structure of several graphitic tubules using a first-principles, self-consistent, all-electron Gaussian-orbital based local-density functional (LDF) approach. We have found that the class of high-symmetry tubules we denote as ''serpentine'' are metallic, with nonzero gaps for other finite radius tubules. With potential electronic and structural applications, these materials appear to be appropriate synthetic targets for the current decade. C1 INDIANA UNIV PURDUE UNIV,DEPT CHEM,INDIANAPOLIS,IN 46202. RP MINTMIRE, JW (reprint author), USN,RES LAB,DIV CHEM,WASHINGTON,DC 20375, USA. OI Mintmire, John/0000-0002-6551-0349 NR 30 TC 124 Z9 125 U1 0 U2 6 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0022-3697 J9 J PHYS CHEM SOLIDS JI J. Phys. Chem. Solids PD DEC PY 1993 VL 54 IS 12 BP 1835 EP 1840 DI 10.1016/0022-3697(93)90296-4 PG 6 WC Chemistry, Multidisciplinary; Physics, Condensed Matter SC Chemistry; Physics GA NA074 UT WOS:A1993NA07400021 ER PT J AU JOHNSON, WB AF JOHNSON, WB TI OUTCOME RESEARCH AND RELIGIOUS PSYCHOTHERAPIES - WHERE ARE WE AND WHERE ARE WE GOING SO JOURNAL OF PSYCHOLOGY AND THEOLOGY LA English DT Article ID COLLABORATIVE RESEARCH-PROGRAM; CLINICAL-SIGNIFICANCE; COMPARATIVE EFFICACY; METHODOLOGICAL ISSUES; COGNITIVE THERAPY; TREATMENT MANUALS; MENTAL-HEALTH; META-ANALYSIS; INTEGRATION; DEPRESSION AB The multitude of religious approaches to psychotherapy are rarely evaluated with established outcome research methodology Factors contributing to the lock of research in this field are discussed. The author offers an integrative foundation for outcome research. State-of-the-art outcome research design components are reviewed and guidelines are offered for conducting outcome research with religious psychotherapies. These are intended to bind such research around a coherent and meaningful program of empirical validation. RP JOHNSON, WB (reprint author), USN,MED CLIN,DEPT MENTAL HLTH,BOX 121,HONOLULU,HI 96860, USA. NR 73 TC 10 Z9 10 U1 1 U2 2 PU ROSEMEAD SCHOOL PSYCHOLOGY PI LA MIRADA PA 13800 BIOLA AVENUE, BIOLA UNIVERSITY, LA MIRADA, CA 90639-0001 SN 0091-6471 J9 J PSYCHOL THEOL JI J. Psychol. Theol. PD WIN PY 1993 VL 21 IS 4 BP 297 EP 308 PG 12 WC Psychology, Multidisciplinary; Religion SC Psychology; Religion GA MN456 UT WOS:A1993MN45600003 ER PT J AU PAPOULIAS, FA AF PAPOULIAS, FA TI ON THE NONLINEAR DYNAMICS OF PURSUIT GUIDANCE FOR MARINE VEHICLES SO JOURNAL OF SHIP RESEARCH LA English DT Article AB A theoretical analysis of the nonlinear dynamic phenomena involved in pure pursuit guidance of marine vehicles is performed. Nomoto's model (Crane et al 1989) is used to provide the basis for the main vehicle turning lag. Results obtained in closed-form expressions demonstrate the existence of bifurcations to periodic solutions. The center manifold of the system is evaluated to within a third-order approximation. Third- and fifth-order expansions are utilized in order to provide information on limit cycle existence and stability. Recommendations regarding the appropriate selection of control design parameters are provided. RP PAPOULIAS, FA (reprint author), USN,POSTGRAD SCH,DEPT MECH ENGN,MONTEREY,CA 93943, USA. NR 0 TC 2 Z9 2 U1 0 U2 1 PU SOC NAVAL ARCH MARINE ENG PI JERSEY CITY PA 601 PAVONIA AVENUE, JERSEY CITY, NJ 07306 SN 0022-4502 J9 J SHIP RES JI J. Ship Res. PD DEC PY 1993 VL 37 IS 4 BP 342 EP 353 PG 12 WC Engineering, Marine; Engineering, Civil SC Engineering GA MR395 UT WOS:A1993MR39500005 ER PT J AU BOOTHKEWLEY, S ROSENFELD, P EDWARDS, JE AF BOOTHKEWLEY, S ROSENFELD, P EDWARDS, JE TI TURNOVER AMONG HISPANIC AND NON-HISPANIC BLUE-COLLAR WORKERS IN THE UNITED-STATES-NAVY CIVILIAN WORK-FORCE SO JOURNAL OF SOCIAL PSYCHOLOGY LA English DT Article; Proceedings Paper CT Annual Meeting of the Military-Testing-Association CY NOV, 1990 CL ORANGE BEACH, FL SP MILITARY TESTING ASSOC ID MEXICAN-AMERICANS; ACCULTURATION AB Turnover rates and factors related to job turnover among Hispanic and non-Hispanic blue-collar employees in the U.S. Navy's civilian work force were investigated. When the subjects started their jobs they were administered a questionnaire assessing possible predictors of turnover, such as acculturation level, method of recruitment, importance of job-related factors, and geographic location considerations. The Hispanic subjects were classified into low-acculturation (LAH) and high-acculturation (HAH) groups. Each subject's employment status (e.g., left vs. remained in the job) was determined 1 year from the date of initial employment, and its relationship to the predictors was analyzed. The results indicated that acculturation was related to turnover. The turnover rate for LAHs was significantly higher than it was for HAHs or for non-Hispanic Whites. Turnover was also higher for Hispanics who found their jobs through friends or relatives than for Hispanics who found their jobs through formal channels. RP BOOTHKEWLEY, S (reprint author), USN,CTR PERSONNEL RES & DEV,WOMEN & MULTICULTURAL RES OFF,CODE 01E,SAN DIEGO,CA 92152, USA. NR 19 TC 3 Z9 3 U1 0 U2 0 PU HELDREF PUBLICATIONS PI WASHINGTON PA 1319 EIGHTEENTH ST NW, WASHINGTON, DC 20036-1802 SN 0022-4545 J9 J SOC PSYCHOL JI J. Soc. Psychol. PD DEC PY 1993 VL 133 IS 6 BP 761 EP 768 PG 8 WC Psychology, Social SC Psychology GA MX583 UT WOS:A1993MX58300001 ER PT J AU AKAY, A SENER, S GAUNAURD, GC AF AKAY, A SENER, S GAUNAURD, GC TI ACOUSTIC SCATTERING FROM FLUID-FILLED, CONCENTRIC, SUBMERGED, CYLINDRICAL, ELASTIC SHELLS SO JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA LA English DT Article ID SOUND AB The present study addresses the scattering of plane (cw) sound waveforms by concentric, fluid-filled, elastic shells in water from the viewpoint of an impedance-based formulation. For a single fluid-filled shell, this impedance formulation is shown to agree with (the exact form of) the earlier resonance scattering theory (RST) which used elastic potentials and matches various stresses and displacements at the boundaries. The comparison cannot be established for more than one (concentric) shell, since there is no RST formulation for such cases. However, the present formulation is used to generate predictions for double shells with various fillers. A number of conclusions emerge from the present analysis and calculations, particularly for the case of two concentric fluid-filled shells. In this instance, if the filler of the annular region in between the shells is air, then the structural components inside that region do not contribute to the scattered field, and can be safely ignored. For a water-filled annular region, the total backscattering form function (at theta=pi) will automatically display the isolated shell resonances, without any need for any ''background'' subtraction. Furthermore, the total angular form functions, evaluated at resonance, will exhibit the typical shape of rhodonea patterns, again without subtracting any type of background. These cases in which background subtraction is not needed are contrasted with various others in which it is needed, and how resonance isolation is achieved in all cases considered is shown. Many computer generated graphs for single and double shells illustrate all these points. C1 WAYNE STATE UNIV,DEPT MECH ENGN,DETROIT,MI 48202. USN,CTR SURFACE WARFARE,WHITE OAK DETACHMENT,SILVER SPRING,MD 20903. RP AKAY, A (reprint author), CARNEGIE MELLON UNIV,DEPT MECH ENGN,PITTSBURGH,PA 15213, USA. NR 18 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 DEC PY 1993 VL 94 IS 6 BP 3277 EP 3294 DI 10.1121/1.407234 PG 18 WC Acoustics; Audiology & Speech-Language Pathology SC Acoustics; Audiology & Speech-Language Pathology GA MM126 UT WOS:A1993MM12600026 ER PT J AU COLLINS, MD FIALKOWSKI, LT KUPERMAN, WA PERKINS, JS AF COLLINS, MD FIALKOWSKI, LT KUPERMAN, WA PERKINS, JS TI ENVIRONMENTAL SOURCE TRACKING SO JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA LA English DT Article ID SOURCE LOCALIZATION; SYNTHETIC-APERTURE; SHALLOW-WATER; DEPTH ESTIMATION; VERTICAL ARRAY; SOUND SPEED; BROAD-BAND; RANGE; RESOLUTION; OCEAN AB Several matched-field processing (MFP) techniques have been developed for localizing a fixed acoustic source. Environmental source tracking (EST) is an approach for determining the track of a moving source. In addition to being attractive from a practical point of view, EST can determine source track in situations in which MFP cannot determine source position. The performance of MFP is limited by the number of propagating modes at the array location. EST can overcome this limitation by exploiting source motion and environmental complexity. For example, EST may be possible when the receiver is placed in a region of the ocean that supports only one propagating mode, a situation in which single-frequency MFP is impossible. MFP requires the use of either an array of receivers or multiple-frequency data. EST requires only a single frequency and a single receiver. Problems such as array deployment and array tilt, which are important with MFP, are therefore irrelevant with EST. RP COLLINS, MD (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 41 TC 13 Z9 13 U1 1 U2 2 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0001-4966 J9 J ACOUST SOC AM JI J. Acoust. Soc. Am. PD DEC PY 1993 VL 94 IS 6 BP 3335 EP 3341 DI 10.1121/1.407239 PG 7 WC Acoustics; Audiology & Speech-Language Pathology SC Acoustics; Audiology & Speech-Language Pathology GA MM126 UT WOS:A1993MM12600031 ER PT J AU SARKISSIAN, A GAUMOND, CF DRAGONETTE, LR AF SARKISSIAN, A GAUMOND, CF DRAGONETTE, LR TI T-MATRIX IMPLEMENTATION OF FORWARD SCATTERING FROM RIGID STRUCTURES SO JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA LA English DT Article AB The T-matrix method is applied to compute forward scattering from rigid structures. The method requires evaluation of matrix elements Q(lk)mm whose imaginary parts with l2.0.CO;2 PG 20 WC Meteorology & Atmospheric Sciences SC Meteorology & Atmospheric Sciences GA ML344 UT WOS:A1993ML34400001 ER PT J AU YEH, TC ELSBERRY, RL AF YEH, TC ELSBERRY, RL TI INTERACTION OF TYPHOONS WITH THE TAIWAN OROGRAPHY .2. CONTINUOUS AND DISCONTINUOUS TRACKS ACROSS THE ISLAND SO MONTHLY WEATHER REVIEW LA English DT Article ID TROPICAL CYCLONES; LANDFALL; FLOW AB Numerical model simulations of west-moving tropical cyclones approaching and crossing the Taiwan orography are shown to contain many of the observed surface features. Vortices tend to track continuously around the northern end of the island due to the deflection of the deep-layer mean flow, and the vortex circulation is modified less because the higher winds to the right of the center do not have a strong interaction with the barrier, Discontinuous tracks predominate for vortices approaching the central and southern portions of the Taiwan orography. Severe distortions of the inner-core circulation occur, and the surface pressure and surface wind centers become decoupled and may be dissipated at different rates. Numerical sensitivity studies demonstrate that more intense and rapidly moving vortices are more likely to cross directly over the barrier and thus maintain a continuous track. In one special case of a weak but fast-moving vortex approaching the southern end, the model simulates the existence of dual centers downstream. These numerical simulations indicate that vortex reorganization downstream may occur as a downward extension from the upper-level remnants of the typhoon or as an upward growth of a low-level secondary vortex. In the second type, a new low-level center that is separate from the original vortex or the terrain-induced pressure trough becomes the center about which the tropical cyclone reorganizes. Distinctions between the two types of secondary vortex developments would be obscurred without the high vertical and temporal resolution fields from the model simulation. C1 USN,POSTGRAD SCH,DEPT METEOROL,CODE MRES,MONTEREY,CA 93943. NR 14 TC 73 Z9 75 U1 0 U2 2 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 DEC PY 1993 VL 121 IS 12 BP 3213 EP 3233 DI 10.1175/1520-0493(1993)121<3213:IOTWTT>2.0.CO;2 PG 21 WC Meteorology & Atmospheric Sciences SC Meteorology & Atmospheric Sciences GA ML344 UT WOS:A1993ML34400002 ER PT J AU BOOTH, A AF BOOTH, A TI FIGURING THE ABSENT CORPSE, STRATEGIES OF REPRESENTATION IN WORLD-WAR-I SO MOSAIC-A JOURNAL FOR THE INTERDISCIPLINARY STUDY OF LITERATURE LA English DT Article RP BOOTH, A (reprint author), USN ACAD,ANNAPOLIS,MD 21402, USA. NR 19 TC 1 Z9 1 U1 1 U2 1 PU UNIV MANITOBA PI WINNIPEG PA MOSAIC 208 TIER BLDG, WINNIPEG MB R3T 2N2, CANADA SN 0027-1276 J9 MOSAIC JI Mosaic-J. Interdiscip. Study Lit. PD WIN PY 1993 VL 26 IS 1 BP 69 EP 85 PG 17 WC Literature SC Literature GA KY690 UT WOS:A1993KY69000005 ER PT J AU CHRISTENSEN, AB KAYSER, DC PRANKE, JB STRAUS, PR GUTIERREZ, DG CHAKRABARTI, S MCCOY, RP MEIER, RR WOLFRAM, KD PICONE, JM AF CHRISTENSEN, AB KAYSER, DC PRANKE, JB STRAUS, PR GUTIERREZ, DG CHAKRABARTI, S MCCOY, RP MEIER, RR WOLFRAM, KD PICONE, JM TI INSTRUMENTATION ON THE REMOTE ATMOSPHERIC AND IONOSPHERIC DETECTION SYSTEM EXPERIMENT - EXTREME-ULTRAVIOLET SPECTROMETER, PHOTOMETER, AND NEAR-INFRARED SPECTROMETER SO OPTICAL ENGINEERING LA English DT Article; Proceedings Paper CT SPIE Conference on Instrumentation for Planetary and Terrestrial Atmospheric Remote Sensing CY JUL, 1992 CL SAN DIEGO, CA SP SOC PHOTO OPT INSTRUMENTAT ENGINEERS DE MAGNETOSPHERIC IMAGERY; ATMOSPHERIC REMOTE SENSING; UPPER ATMOSPHERE; AIRGLOW; EXTREME ULTRAVIOLET INSTRUMENTATION ID O-I 6300-A; EXCITATION; NIGHTGLOW AB The Remote Atmospheric and lonospheric Detection System experiment consists of eight instruments spanning the wavelength range from the extreme ultraviolet (55 nm) to the near infrared (800 nm) oriented to view the Earth's limb from the National Oceanic and Atmospheric Administration TIROS-J spacecraft to be launched into a circular orbit in 1993. Through measurements of the natural optical emissions and scattered sunlight originating in the upper atmosphere including the mesosphere and thermosphere, state variables such as temperature, composition, density, and ion concentration of this region will be inferred. The subset of instruments fabricated or otherwise provided by the Space and Environment Technology Center (formerly Space Sciences Laboratory) at The Aerospace Corporation are described. C1 BOSTON UNIV,CTR SPACE PHYS,DEPT ASTRON,BOSTON,MA 02215. USN,E O HULBERT CTR SPACE RES,RES LAB,WASHINGTON,DC 20375. RP CHRISTENSEN, AB (reprint author), AEROSP CORP,CTR SPACE & ENVIRONM TECHNOL,POB 92957,LOS ANGELES,CA 90009, USA. RI Meier, Robert/G-4749-2014 OI Meier, Robert/0000-0001-8497-7115 NR 10 TC 10 Z9 11 U1 0 U2 1 PU SOC PHOTO-OPT INSTRUM ENG PI BELLINGHAM PA PO BOX 10, BELLINGHAM, WA 98227-0010 SN 0091-3286 J9 OPT ENG JI Opt. Eng. PD DEC PY 1993 VL 32 IS 12 BP 3054 EP 3059 DI 10.1117/12.149189 PG 6 WC Optics SC Optics GA ML621 UT WOS:A1993ML62100008 ER PT J AU JUSTUS, BL CAMPILLO, AJ HENDERSHOT, DG GASKILL, DK AF JUSTUS, BL CAMPILLO, AJ HENDERSHOT, DG GASKILL, DK TI OPTICAL LIMITING IN SEMICONDUCTOR NANOCRYSTALS IN GLASS SO OPTICS COMMUNICATIONS LA English DT Article ID DOPED GLASSES; MICROCRYSTALLITES; NONLINEARITY; ABSORPTION; GAAS AB Reported is optical limiting in the near-ir using composites consisting of quantum-confined nanocrystals of InP in porous Vycor glass. The nonlinear optical properties of the InP-doped glasses, investigated using the Z-scan technique, were characterized by a negative nonlinear index, absorption-induced negative refraction due to carriers, and nonlinear loss due to two-photon absorption and excited state absorption of carriers. RP JUSTUS, BL (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 22 TC 19 Z9 19 U1 0 U2 4 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0030-4018 J9 OPT COMMUN JI Opt. Commun. PD DEC 1 PY 1993 VL 103 IS 5-6 BP 405 EP 409 DI 10.1016/0030-4018(93)90165-2 PG 5 WC Optics SC Optics GA MH353 UT WOS:A1993MH35300013 ER PT J AU SCHARPF, WJ BOCZAR, BP DEWEY, CF AF SCHARPF, WJ BOCZAR, BP DEWEY, CF TI ANALYSIS OF CDTE AND CDMNTE QUASI-PHASEMATCHED OPTICAL PARAMETRIC OSCILLATOR AND AMPLIFIER SO OPTICS COMMUNICATIONS LA English DT Article ID MATCHING WAVE-GUIDES; 2ND-HARMONIC GENERATION; CRYSTALS AB An analysis is presented of a quasi-phasematched optical parametric oscillator and amplifier using rotationally-twinned CdTe and CdMnTe. The periodic structure of these crystals is shown to create pin for both the signal and idler wavelengths. The signal pin of a single pass optical parametric amplifier is shown to be insensitive to wavelength and to alignment of the crystal. These results show that a quasi-phasedmatched optical parametric oscillator or amplifier has distinctly different characteristics than a conventional birefringently phasematched device. An analysis of an oscillator pumping threshold was also performed to determine the minimum number of domains for useful operation. With modest improvements in the current state of the art, attractive devices may be constructed. C1 MIT,CAMBRIDGE,MA 02139. RP SCHARPF, WJ (reprint author), USN,CTR AIR WARFARE,WARMINSTER,PA 18974, USA. NR 19 TC 0 Z9 0 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0030-4018 J9 OPT COMMUN JI Opt. Commun. PD DEC 1 PY 1993 VL 103 IS 5-6 BP 429 EP 433 DI 10.1016/0030-4018(93)90169-6 PG 5 WC Optics SC Optics GA MH353 UT WOS:A1993MH35300017 ER PT J AU OLSEN, EA AF OLSEN, EA TI THE JAPANESE CHALLENGE SO ORBIS-A JOURNAL OF WORLD AFFAIRS LA English DT Letter RP OLSEN, EA (reprint author), USN,POSTGRAD SCH,MONTEREY,CA 93940, USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU JAI PRESS INC PI GREENWICH PA 55 OLD POST RD-#2, PO BOX 1678, GREENWICH, CT 06836-1678 SN 0030-4387 J9 ORBIS-J WORLD AFF JI Orbis-J. World Aff. PD WIN PY 1993 VL 37 IS 1 BP 149 EP 154 DI 10.1016/0030-4387(93)90019-9 PG 6 WC International Relations SC International Relations GA KE010 UT WOS:A1993KE01000018 ER PT J AU CASSADY, CJ MCELVANY, SW AF CASSADY, CJ MCELVANY, SW TI COLLISION-INDUCED DISSOCIATION AND PHOTODISSOCIATION OF NITROAROMATIC MOLECULAR-IONS - A UNIQUE ISOMERIZATION FOR P-NITROTOLUENE AND P-ETHYLNITROBENZENE IONS SO ORGANIC MASS SPECTROMETRY LA English DT Article ID MASS-SPECTROMETER; GAS-PHASE; PHOTO-DISSOCIATION; NITROBENZENE ION; + IONS; ORGANIC IONS; FRAGMENTATION; IONIZATION; RESONANCE; SPECTRA AB The photodissociation and low-energy collision-induced dissociation of p-nitrotoluene and p-ethylnitrobenzene molecular ions were studied using Fourier transform ion cyclotron resonance mass spectrometry. The dissociation of these ions is highly dependent on the time-scale of the experiment and the pressure of the nitroaromatic compound. Collisions of the ions with nitroaromatic neutral species increase the abundance of fragment ions due to NO elimination, while collisions with inert gases such as sulfur hexafluoride and argon have no effect. Evidence is presented for the occurrence of an ion-molecule reaction between p-alkylnitrobenzene ions and nitroaromatic neutral species that induces isomerization of the ion. This isomerization is proposed to involve a nitro-to-nitrite rearrangement. Although the mechanism of this process is unknown, isotopic labeling experiments have shown that it does not involve nitrogen atom transfer between the two reactants. The dissociations of o-nitrotoluene, m-nitrotoluene and nitrobenzene ions are also discussed. For these ions, no pressure- or time-scale-dependent behavior was observed, indicating that an isomerization did not occur. C1 USN,RES LAB,DIV CHEM,CODE 6113,WASHINGTON,DC 20375. RP CASSADY, CJ (reprint author), MIAMI UNIV,DEPT CHEM,OXFORD,OH 45056, USA. RI Cassady, Carolyn/C-7865-2009 NR 46 TC 4 Z9 4 U1 1 U2 7 PU JOHN WILEY & SONS LTD PI W SUSSEX PA BAFFINS LANE CHICHESTER, W SUSSEX, ENGLAND PO19 1UD SN 0030-493X J9 ORG MASS SPECTROM JI Org. Mass Spectrom. PD DEC PY 1993 VL 28 IS 12 BP 1650 EP 1657 DI 10.1002/oms.1210281242 PG 8 WC Chemistry, Organic; Spectroscopy SC Chemistry; Spectroscopy GA NA882 UT WOS:A1993NA88200041 ER PT J AU MACE, NA AF MACE, NA TI THE HISTORY OF THE GRAMMAR-PATENT, 1547-1620 SO PAPERS OF THE BIBLIOGRAPHICAL SOCIETY OF AMERICA LA English DT Article RP MACE, NA (reprint author), USN ACAD,DEPT ENGLISH,ANNAPOLIS,MD 21402, USA. NR 12 TC 3 Z9 3 U1 0 U2 0 PU BIBLIOGRAPHICAL SOC AMER PI NEW YORK PA BOX 397 GRAND CENTRAL STATION, NEW YORK, NY 10163 SN 0006-128X J9 PAP BIBLIOGR SOC AM JI Pap. Bibliogra. Soc. Am. PD DEC PY 1993 VL 87 IS 4 BP 419 EP 436 PG 18 WC Humanities, Multidisciplinary SC Arts & Humanities - Other Topics GA PE310 UT WOS:A1993PE31000001 ER PT J AU GROSSMAN, I KAUFMAN, AS GROSSMAN, D AF GROSSMAN, I KAUFMAN, AS GROSSMAN, D TI CORRELATIONS OF SCORES ON THE KAUFMAN SHORT NEUROPSYCHOLOGICAL ASSESSMENT PROCEDURE AND THE KAUFMAN ADOLESCENT AND ADULT INTELLIGENCE-TEST FOR A HOSPITALIZED DEPRESSED SAMPLE SO PERCEPTUAL AND MOTOR SKILLS LA English DT Article AB Scores on the K-SNAP, a new brief cognitive measure designed to assess neuropsychological functioning in adolescents and adults, were correlated with KAIT IQs, a comprehensive test that measures fluid and crystallized intelligence. The sample included 33 adolescent and adult patients hospitalized for depression. The K-SNAP correlated significantly higher with fluid than crystallized intelligence. C1 UNIV ALABAMA,UNIVERSITY,AL 35486. USN HOSP,SAN DIEGO,CA 92134. RP GROSSMAN, I (reprint author), MESA VISTA HOSP,PSYCHOL SERV,7850 VISTA HILL AVE,SAN DIEGO,CA 92123, USA. NR 11 TC 3 Z9 3 U1 0 U2 1 PU PERCEPTUAL MOTOR SKILLS PI MISSOULA PA PO BOX 9229, MISSOULA, MT 59807 SN 0031-5125 J9 PERCEPT MOTOR SKILL JI Percept. Mot. Skills PD DEC PY 1993 VL 77 IS 3 BP 1055 EP 1058 PN 1 PG 4 WC Psychology, Experimental SC Psychology GA MJ751 UT WOS:A1993MJ75100061 PM 8284141 ER PT J AU KERSEY, AD BURNS, WK AF KERSEY, AD BURNS, WK TI FIBER OPTIC GYROSCOPES PUT A NEW SPIN ON NAVIGATION - LOW-COST TECHNOLOGIES STEER FIBER GYROS TO NEW MAINSTREAM APPLICATIONS SO PHOTONICS SPECTRA LA English DT Article RP KERSEY, AD (reprint author), USN,RES LAB,OPT SENSOR SECT,WASHINGTON,DC 20375, USA. NR 0 TC 3 Z9 3 U1 0 U2 0 PU LAURIN PUBL CO INC PI PITTSFIELD PA BERKSHIRE COMMON PO BOX 1146, PITTSFIELD, MA 01202 SN 0731-1230 J9 PHOTON SPECTRA JI Photon. Spect. PD DEC PY 1993 VL 27 IS 12 BP 72 EP & PG 0 WC Optics SC Optics GA MM572 UT WOS:A1993MM57200027 ER PT J AU GRUBER, JB QUAGLIANO, JR REID, MF RICHARDSON, FS HILLS, ME SELTZER, MD STEVENS, SB MORRISON, CA ALLIK, TH AF GRUBER, JB QUAGLIANO, JR REID, MF RICHARDSON, FS HILLS, ME SELTZER, MD STEVENS, SB MORRISON, CA ALLIK, TH TI ENERGY-LEVELS AND CORRELATION CRYSTAL-FIELD EFFECTS IN ER3+-DOPED GARNETS SO PHYSICAL REVIEW B LA English DT Article ID F TRANSITION INTENSITIES; SPECTROSCOPIC ANALYSIS; PARAMETRIC ANALYSIS; UPCONVERSION LASER; ABSORPTION-SPECTRA; ER3+ IONS; ND-YLF; ND-3+; DIODE; Y3SC2AL3O12 AB The crystal-field energy-level structures of three different Er3+-doped garnet systems are analyzed and compared in this study. The garnet hosts are Y3Al5O12 (YAG), Y3Sc2Al3O12 (YSAG) doped with TM3+ as a sensitizer ion, and Y3Sc2Ga3O12 (YSGG) doped with Cr3+ as a sensitizer ion. The focus is on energy levels assigned to Er3+ ions substituted for Y3+ at dodecahedral (D2 SYmmetry) sites in the cubic gamet lattices. Analyses are carried out on experimental energy-level data that span up to 29 different 2S + 1L(J) multiplet manifolds (between 0 and 44 000 cm-1) of the Er3+ 4f11 electronic configuration. These data include the locations of 117 crystal-field levels of Er3+ in YAG, 109 levels of Er3+ in YSAG, and 92 levels of Er3+ in YSGG. The energy-level analyses are based on the use of a parametrized model Hamiltonian for the 4f11 electronic configuration of Er3+ in a crystal field of D2 symmetry. The model Hamiltonian includes both atomic (''free-ion'') and crystal-field interactions, parametrized to fit calculated eigenvalues to experimentally observed energies. The crystal-field part of the Hamiltonian is defined to include the standard one-electron interaction operators, as well as additional operators that provide a partial, phenomenological consideration of electron-correlation effects in the 4f-electron-crystal-field interactions. The latter, correlation crystal-field (CCF) interactions, are introduced to address crystal-field splittings within several J-multiplet manifolds that are poorly represented by one-electron crystal-field interaction models. Inclusion of CCF terms in the model Hamiltonian leads to dramatic improvement in the fits between calculated and observed crystal-field splittings within the problematic multiplet manifolds. All of the energy-level analyses reported in this study were carried out within commensurate parametrization schemes, and the Hamiltonian parameters derived from these analyses provide a suitable basis for comparing the 4f-electron-crystal-field interaction properties of Er3+ in YAG, YSAG, and YSGG. These analyses are based entirely on experimental data that specify the locations of energy levels, but do not provide any explicit information about the angular momentum (JM(J)) compositions of the crystal-field wave functions. C1 UNIV VIRGINIA,DEPT CHEM,CHARLOTTESVILLE,VA 22901. USN,CTR AIR WARFARE,RES DEPT,DIV CHEM,DIV WEAPONS,CHINA LAKE,CA 93555. USA,COMMAND LAB,HARRY DIAMOND LABS,ADELPHI,MD 20783. SCI APPLICAT INT CORP,MCLEAN,VA 22102. RP GRUBER, JB (reprint author), SAN JOSE STATE UNIV,DEPT PHYS,SAN JOSE,CA 95192, USA. OI Reid, Michael/0000-0002-2984-9951 NR 54 TC 102 Z9 105 U1 3 U2 25 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 DEC 1 PY 1993 VL 48 IS 21 BP 15561 EP 15573 DI 10.1103/PhysRevB.48.15561 PG 13 WC Physics, Condensed Matter SC Physics GA ML281 UT WOS:A1993ML28100005 ER PT J AU MCKEOWN, DA BELL, MI KIM, CC AF MCKEOWN, DA BELL, MI KIM, CC TI RAMAN-SPECTROSCOPY OF SILICATE RINGS - BENITOITE AND THE 3-MEMBERED RING SO PHYSICAL REVIEW B LA English DT Article ID GLASSES AB Polarized single-crystal Raman spectra of benitoite (BaTiSi3O9) were gathered and atomic displacements have been assigned to each line in the spectra from our interpretations of the Raman data, from determinations by Adams and Gardner in an earlier study, and from determinations by lattice-dynamics calculations. The spectra can be naturally divided into three frequency ranges, where lattice-dynamics calculations show that the 50 to 300 cm-1 range contains Ba, Ti, ring translational, and ring rotational modes, the 300 to 800 cm-1 range contains three-membered silicate ring breathing, stretching, and deformation modes, and the 800 to 1200 cm-1 range contains Si-O bond-stretching modes. From our conclusions for benitoite, Raman features in the 300 to 800 cm-1 range may be sensitive to changes in Si-O-Si bond angles, or to the number of silicate tetrahedra within planar rings. C1 USN,RES LAB,WASHINGTON,DC 20375. RP MCKEOWN, DA (reprint author), HOWARD UNIV,DEPT CHEM,WASHINGTON,DC 20059, USA. NR 21 TC 22 Z9 22 U1 1 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 DEC 1 PY 1993 VL 48 IS 22 BP 16357 EP 16365 DI 10.1103/PhysRevB.48.16357 PG 9 WC Physics, Condensed Matter SC Physics GA MM350 UT WOS:A1993MM35000015 ER PT J AU OHRING, S LUGT, HJ AF OHRING, S LUGT, HJ TI THE DECAY OF A PAIR OF POINT VORTICES IN A VISCOUS-FLUID SO PHYSICS OF FLUIDS A-FLUID DYNAMICS LA English DT Note AB The decay of two counter-rotating point vortices of equal strength in a viscous incompressible fluid is studied by solving the Navier-Stokes equations with a finite-difference technique. Solutions for Reynolds numbers 10, 50, and 100 are compared with a model presented by Cantwell and Rott. Equivorticity lines and the decay rate of translational velocity and circulation of the half-plane are presented, together with the diverging paths of the vortex pair. RP OHRING, S (reprint author), USN,CTR SURFACE WARFARE,CARDEROCK DIV,BETHESDA,MD 20084, USA. NR 4 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 0899-8213 J9 PHYS FLUIDS A-FLUID PD DEC PY 1993 VL 5 IS 12 BP 3299 EP 3301 DI 10.1063/1.858689 PG 3 WC Mechanics; Physics, Fluids & Plasmas SC Mechanics; Physics GA MJ058 UT WOS:A1993MJ05800032 ER PT J AU GAO, Y SMITH, GJ ALBERTE, RS AF GAO, Y SMITH, GJ ALBERTE, RS TI NITRATE REDUCTASE FROM THE MARINE DIATOM SKELETONEMA-COSTATUM - BIOCHEMICAL AND IMMUNOLOGICAL CHARACTERIZATION SO PLANT PHYSIOLOGY LA English DT Article ID AFFINITY-CHROMATOGRAPHY; RAPID MODULATION; PURIFICATION; PROTEIN; NADH; PHOTOSYNTHESIS; PHYTOPLANKTON; AVAILABILITY; NITRITE; INVITRO AB Assimilatory nitrate reductase (NR) was purified from the marine diatom Skeletonema costatum (clone Skel) using Cibacron blue-Sepharose affinity chromatography. The single-step purification scheme yielded a 103-fold purification of specific activity with an overall recovery of 40.8%. Only NADH-dependent NR activity (form EC 1.6.6.1) was observed in this species. Kinetic analysis revealed that this form had apparent Michaelis constants of 3.6 muM for NADH and 295 muM for NO3- when purified from cells grown in NO3--enriched seawater. The S. costatum NR exhibits a pH optimum of 7.4, a temperature optimum of 14-degrees-C, and enzyme activity not sensitive to Mg2+ inhibition. The strong temperature dependence of NR activity in S. costatum may contribute to the seasonal and latitudinal distributions and abundances of this bloom-forming species. Chromatographically isolated NR was further purified by sodium dodecyl sulfate-polyacrylamide gel electrophoresis, yielding a single polypeptide with an apparent molecular mass of 110 kD. The 110-kD polypeptide was used to generate polyclonal antibodies. The antiserum recognized a single 110-kD polypeptide in western blots of total proteins from S. costatum, as well as the native enzyme. Western blot analysis also revealed an antigenic similarity of NR from two additional diatom species, whereas no cross-reactivity was observed with NR from other phytoplankton taxa, including prymnesiophytes, dinoflagellate, cyanobacterium, and green alga. This result suggests a structural diversity of NR in phytoplankton and identifies the potential for development of taxon-specific NR antisera for ecological studies. C1 UNIV SO CALIF,DEPT BIOL SCI,LOS ANGELES,CA 90089. UNIV CALIF LOS ANGELES,DEPT BIOL,LOS ANGELES,CA 90024. OFF NAVAL RES,CELL & ENVIRONM BIOL PROGRAM,ARLINGTON,VA 22217. NR 41 TC 31 Z9 35 U1 3 U2 5 PU AMER SOC PLANT PHYSIOLOGISTS PI ROCKVILLE PA 15501 MONONA DRIVE, ROCKVILLE, MD 20855 SN 0032-0889 J9 PLANT PHYSIOL JI Plant Physiol. PD DEC PY 1993 VL 103 IS 4 BP 1437 EP 1445 PG 9 WC Plant Sciences SC Plant Sciences GA ML412 UT WOS:A1993ML41200052 ER PT J AU WIKENHEISER, KA VORBROKER, DK RICE, WR CLARK, JC BACHURSKI, CJ OIE, HK WHITSETT, JA AF WIKENHEISER, KA VORBROKER, DK RICE, WR CLARK, JC BACHURSKI, CJ OIE, HK WHITSETT, JA TI PRODUCTION OF IMMORTALIZED DISTAL RESPIRATORY EPITHELIAL-CELL LINES FROM SURFACTANT PROTEIN-C SIMIAN VIRUS-40 LARGE TUMOR-ANTIGEN TRANSGENIC MICE SO PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA LA English DT Article ID II CELLS; PHOSPHOLIPID SECRETION; MESSENGER-RNA; LUNG; GENE; EXPRESSION; SEQUENCE; GROWTH; CULTURE; INVITRO AB Murine lung epithelial (MLE) cell lines representing the distal bronchiolar and alveolar epithelium were produced from lung tumors generated in transgenic mice harboring the viral oncogene simian virus 40 (SV40) large tumor antigen under transcriptional control of a promoter region from the human surfactant protein C (SP-C) gene. The cell lines exhibited rapid growth, lack of contact inhibition, and an epithelial cell morphology for 30-40 passages in culture. Microvilli, cytoplasmic multivesicular bodies, and multilamellar inclusion bodies (morphologic characteristics of alveolar type II cells) were detected in some of the MLE cell lines by electron microscopic analysis. The MLE cells also maintained functional characteristics of distal respiratory epithelial cells including the expression of surfactant proteins and mRNAs and the ability to secrete phospholipids. Expression of the exogenous SV40 large tumor antigen gene was detected in all of the generated cell lines. The SP-C/SV40 large tumor antigen transgenic mice and the MLE cell lines will be useful for the study of pulmonary surfactant production and regulation as well as lung development and tumorigenesis. C1 USN HOSP,NCI,NAVAL MED ONCOL BRANCH,BETHESDA,MD 20814. RP WIKENHEISER, KA (reprint author), CHILDRENS HOSP MED CTR,DIV PULM BIOL,CINCINNATI,OH 45229, USA. FU NHLBI NIH HHS [HL38764, HL28623, HL41496] NR 35 TC 256 Z9 260 U1 0 U2 2 PU NATL ACAD SCIENCES PI WASHINGTON PA 2101 CONSTITUTION AVE NW, WASHINGTON, DC 20418 SN 0027-8424 J9 P NATL ACAD SCI USA JI Proc. Natl. Acad. Sci. U. S. A. PD DEC 1 PY 1993 VL 90 IS 23 BP 11029 EP 11033 DI 10.1073/pnas.90.23.11029 PG 5 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA MK094 UT WOS:A1993MK09400031 PM 8248207 ER PT J AU WEIDMAN, DJ RHEE, MJ SCHNEIDER, RF AF WEIDMAN, DJ RHEE, MJ SCHNEIDER, RF TI FAST-RISE, LARGE-VOLUME, 1.7-KG MAGNETIC-FIELD COIL SO REVIEW OF SCIENTIFIC INSTRUMENTS LA English DT Article ID ROGOWSKI COIL AB A one-turn coil of 20 cm diameter and 30 cm length produces a field up to 1.7 kG with a rise time of 30 ns. The rate of rise of field, nearly 6 T/mus, is faster than for any other coil of this size. Powering the coil is a transformer-charged pulse-forming line machine operating at up to 28 kA, 280 kV without deleterious arcing. The field is uniform to 5% over the coil length, focusing an electron beam passing along its axis. C1 UNIV MARYLAND,DEPT ELECT ENGN,COLL PK,MD 20742. USN,CTR SURFACE WARFARE,WHITE OAK,MD 20903. RP WEIDMAN, DJ (reprint author), UNIV MARYLAND,PLASMA RES LAB,COLL PK,MD 20742, USA. NR 16 TC 1 Z9 1 U1 0 U2 0 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0034-6748 J9 REV SCI INSTRUM JI Rev. Sci. Instrum. PD DEC PY 1993 VL 64 IS 12 BP 3376 EP 3379 DI 10.1063/1.1144307 PG 4 WC Instruments & Instrumentation; Physics, Applied SC Instruments & Instrumentation; Physics GA MM177 UT WOS:A1993MM17700002 ER PT J AU GEHRELS, N FICHTEL, CE FISHMAN, GJ KURFESS, JD SCHONFELDER, V AF GEHRELS, N FICHTEL, CE FISHMAN, GJ KURFESS, JD SCHONFELDER, V TI THE COMPTON-GAMMA-RAY-OBSERVATORY SO SCIENTIFIC AMERICAN LA English DT Article C1 MAX PLANCK INST EXTRATERR PHYS,GAMMA RAY ASTRON GRP,GARCHING,GERMANY. NASA,GEORGE C MARSHALL SPACE FLIGHT CTR,HUNTSVILLE,AL 35812. NASA,GODDARD SPACE FLIGHT CTR,GAMMA RAY ASTROPHYS BRANCH,GREENBELT,MD 20771. USN,RES LAB,GAMMA & COSMIC RAY ASTROPHYS BRANCH,WASHINGTON,DC 20375. RP GEHRELS, N (reprint author), NASA,GODDARD SPACE FLIGHT CTR,HIGH ENERGY ASTROPHYS LAB,GREENBELT,MD 20771, USA. RI Gehrels, Neil/D-2971-2012 NR 5 TC 22 Z9 22 U1 0 U2 0 PU SCI AMERICAN INC PI NEW YORK PA 415 MADISON AVE, NEW YORK, NY 10017 SN 0036-8733 J9 SCI AM JI Sci.Am. PD DEC PY 1993 VL 269 IS 6 BP 68 EP & PG 0 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA MG629 UT WOS:A1993MG62900025 ER PT J AU BHOLE, SD FOX, AG AF BHOLE, SD FOX, AG TI SOME INTERESTING MICROSTRUCTURES IN VERY-LOW CARBON HIGH MANGANESE MICROALLOYED STEELS SO SCRIPTA METALLURGICA ET MATERIALIA LA English DT Article C1 USN,POSTGRAD SCH,DEPT MECH ENGN,MAT SCI SECT,MONTEREY,CA 93943. RP BHOLE, SD (reprint author), UNIV REGINA,REGINA S4S 0A2,SASKATCHEWAN,CANADA. NR 11 TC 0 Z9 0 U1 0 U2 0 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0956-716X J9 SCRIPTA METALL MATER JI Scr. Metall. Materialia PD DEC 1 PY 1993 VL 29 IS 11 BP 1391 EP 1396 DI 10.1016/0956-716X(93)90325-M PG 6 WC Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Materials Science; Metallurgy & Metallurgical Engineering GA MB465 UT WOS:A1993MB46500003 ER PT J AU COWEN, MB AF COWEN, MB TI DESIGNING AN INSTRUCTIONAL SIMULATION FOR A PROGRAM ENTRY PANEL SO SIMULATION & GAMING LA English DT Article DE COMPUTER-BASED TRAINING; CONTROL PANELS; ELECTRONIC DEVICES; ELECTRONIC PRODUCTS; INSTRUCTIONAL SIMULATION; OPERATIONAL TRAINING; PROGRAM ENTRY PANELS; TRAINING SYSTEMS AB Operating many consumer products and electronic industrial machines is difficult when a clear relationship does not exist between the user interface and the device behavior The mental representation of the user interface for an electronic device can include knowledge of button syntax and semantics as well as an understanding of the underlying model of the electronic device. Users do not need to learn the underlying device model because the sequence of steps required to operate most electronic devices generally cannot be inferred from the engineering models. A computer-based instructional simulation of a program entry panel for a telephone system was developed to help users learn panel syntax and semantics. RP COWEN, MB (reprint author), USN,CTR PERSONNEL RES & DEV,DIV TRAINING SYST APPLICAT,CODE 13,SAN DIEGO,CA 92152, USA. NR 11 TC 0 Z9 0 U1 0 U2 0 PU SAGE PUBLICATIONS INC PI THOUSAND OAKS PA 2455 TELLER RD, THOUSAND OAKS, CA 91320 SN 1046-8781 J9 SIMULAT GAMING JI Simul. Gaming PD DEC PY 1993 VL 24 IS 4 BP 500 EP 506 DI 10.1177/1046878193244007 PG 7 WC Social Sciences, Interdisciplinary SC Social Sciences - Other Topics GA MG071 UT WOS:A1993MG07100007 ER PT J AU JACKSON, BV HOWARD, RA AF JACKSON, BV HOWARD, RA TI A CME MASS-DISTRIBUTION DERIVED FROM SOLWIND CORONAGRAPH OBSERVATIONS SO SOLAR PHYSICS LA English DT Article ID SOLAR MAXIMUM MISSION; EJECTIONS; TRANSIENTS; SKYLAB AB Using estimates of the masses of nearly 1000 CMEs observed by SOLWIND from Howard ct al. (1985), we re-plot the numbers of CMEs as a function of CME mass on a log-linear plot. The plot is significant in that it shows a linear trend over more than a decade of CME masses. The plot indicates a simple form for the distribution of the CME masses and allows an easy determination of the total mass ejected into the solar wind in the form of CMEs. We find that approximately 16% of the solar wind at solar maximum can be comprised of CME mass. There is no indication that the numbers of low-mass CMEs increase in number above the trend set by the more massive ones. Specifically, there is no increase in the numbers of small CMEs such that the whole of the solar wind can be comprised of them. C1 USN,RES LAB,EO HULBURT CTR SPACE RES,WASHINGTON,DC 20375. RP JACKSON, BV (reprint author), CTR ASTROPHYS & SPACE SCI,SAN DIEGO,CA 92093, USA. NR 23 TC 24 Z9 25 U1 0 U2 2 PU KLUWER ACADEMIC PUBL PI DORDRECHT PA SPUIBOULEVARD 50, PO BOX 17, 3300 AA DORDRECHT, NETHERLANDS SN 0038-0938 J9 SOL PHYS JI Sol. Phys. PD DEC PY 1993 VL 148 IS 2 BP 359 EP 370 DI 10.1007/BF00645095 PG 12 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA ML851 UT WOS:A1993ML85100012 ER PT J AU BLACKSTEAD, HA PULLING, DB HORWITZ, JS CHRISEY, DB AF BLACKSTEAD, HA PULLING, DB HORWITZ, JS CHRISEY, DB TI OBSERVATION OF GIANT FLUX-FLOW IN SUPERCONDUCTING YBA2CU3O7-DELTA FILMS SO SOLID STATE COMMUNICATIONS LA English DT Article ID HIGH-TEMPERATURE SUPERCONDUCTORS; CRITICAL CURRENT-DENSITY; PHASE-SLIP DISSIPATION; STATIC MAGNETIC-FIELD; CRYSTALLINE BI2SR2CACU2O8+DELTA; II SUPERCONDUCTORS; SURFACE IMPEDANCE; SINGLE-CRYSTALS; THIN-FILMS; RESISTIVITY AB Measurements of field-induced changes the a-b plane surface resistance of high quality (> 10(6) A/cm(2) at 77K and H=0) YBa2Cu3O7-delta films at 12.92 GHz reveal enormous flux-flow resistivity at temperatures several degrees below the superconducting onset temperature. Flux-flow resistivity is identified by its dependence on the Lorentz force. The results suggest that large scale effective pinning is not responsible for the high critical current density observed in these films; a reduction in structural defects and improved oxygen vacancy ordering may be of greater importance. C1 NAVAL RES LAB, WASHINGTON, DC 20375 USA. RP BLACKSTEAD, HA (reprint author), UNIV NOTRE DAME, DEPT PHYS, NOTRE DAME, IN 46556 USA. NR 34 TC 3 Z9 3 U1 0 U2 0 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLAND SN 0038-1098 EI 1879-2766 J9 SOLID STATE COMMUN JI Solid State Commun. PD DEC PY 1993 VL 88 IS 9 BP 671 EP 675 DI 10.1016/0038-1098(93)90622-T PG 5 WC Physics, Condensed Matter SC Physics GA ML708 UT WOS:A1993ML70800001 ER PT J AU HIBBS, RG AF HIBBS, RG TI DIARRHEAL DISEASE - CURRENT CONCEPTS AND FUTURE CHALLENGES - INTRODUCTION SO TRANSACTIONS OF THE ROYAL SOCIETY OF TROPICAL MEDICINE AND HYGIENE LA English DT Editorial Material RP HIBBS, RG (reprint author), USN,MED RES UNIT 3,PSC 452,BOX 5000,FPO AE09835,CAIRO,EGYPT. NR 0 TC 5 Z9 5 U1 0 U2 1 PU ROYAL SOC TROPICAL MEDICINE PI LONDON PA MANSON HOUSE 26 PORTLAND PLACE, LONDON, ENGLAND W1N 4EY SN 0035-9203 J9 T ROY SOC TROP MED H JI Trans. Roy. Soc. Trop. Med. Hyg. PD DEC PY 1993 VL 87 SU 3 BP 1 EP 2 DI 10.1016/0035-9203(93)90527-W PG 2 WC Public, Environmental & Occupational Health; Tropical Medicine SC Public, Environmental & Occupational Health; Tropical Medicine GA MM104 UT WOS:A1993MM10400001 PM 8108841 ER PT J AU MURPHY, JR AF MURPHY, JR TI RAPID DETECTION OF ENTERIC INFECTIONS BY MEASUREMENT OF ENTERIC PATHOGEN-SPECIFIC ANTIBODY-SECRETING CELLS IN PERIPHERAL-BLOOD SO TRANSACTIONS OF THE ROYAL SOCIETY OF TROPICAL MEDICINE AND HYGIENE LA English DT Article; Proceedings Paper CT Symposium on Diarrhoeal Disease : Current Concepts and Future Challenges CY JAN 06, 1993 CL LONDON, UNITED KINGDOM SP ROYAL SOC TROPI MED & HYGIENE, US NAVAL MED RES UNIT NUMBER 3, PATHOL SOC GREAT BRITAIN ID ORAL TYPHOID VACCINE; SALMONELLA-TYPHI; CELLULAR-IMMUNITY; FIELD TRIAL; TY 21A; LIVE; MUTANT; IMMUNOGENICITY; REGIONS; STRAIN AB Enteric infections and diarrhoeal disease are important causes of morbidity and mortality. Infections are often difficult to diagnose, especially when access to sophisticated laboratory facilities is limited. In an attempt to develop a rapid method of diagnosis, which might not require an advanced laboratory, advantage was taken of the observation that precursors of lymphocytes secreting immunoglobulin A (IgA), generated in response to mucosal stimulation with an antigen, are transiently resent in peripheral blood. Detection of cells in peripheral blood bearing IgA specific for a pathogenic microbe should indicate current infection. This hypothesis was tested using peripheral blood mononuclear cells collected from Volunteers who were clinically 'normal', had experimentally induced shigellosis, had naturally acquired shigellosis, or had naturally acquired typhoid fever. The method was sensitive for detection of Salmonella typhi infection and less sensitive for detection of Shigella infection. The antibody secreting cell procedure has good potential as a rapid, simple diagnostic procedure if applied during the acute phase of infection. C1 UNIV TEXAS,HLTH SCI CTR,CTR INFECT DIS,HOUSTON,TX. RP MURPHY, JR (reprint author), USN,MED RES UNIT 3,CAIRO,EGYPT. FU NIAID NIH HHS [N01-AI-62528] NR 11 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 DEC PY 1993 VL 87 SU 3 BP 27 EP 30 DI 10.1016/0035-9203(93)90533-V PG 4 WC Public, Environmental & Occupational Health; Tropical Medicine SC Public, Environmental & Occupational Health; Tropical Medicine GA MM104 UT WOS:A1993MM10400007 PM 8108845 ER PT J AU KILPATRICK, ME AF KILPATRICK, ME TI DIARRHEAL DISEASE - A MILITARY PERSPECTIVE SO TRANSACTIONS OF THE ROYAL SOCIETY OF TROPICAL MEDICINE AND HYGIENE LA English DT Article; Proceedings Paper CT Symposium on Diarrhoeal Disease : Current Concepts and Future Challenges CY JAN 06, 1993 CL LONDON, UNITED KINGDOM SP ROYAL SOC TROPI MED & HYGIENE, US NAVAL MED RES UNIT NUMBER 3, PATHOL SOC GREAT BRITAIN AB Diarrhoeal disease has always been a major medical problem during military operations. Lost personnel time has been significant, with over 50% of deployed forces being affected and unable to do their jobs for several days. During 'Operation Desert Shield' in Saudi Arabia in 1990, the US military took extensive precautions to prevent diarrhoeal disease. Surveys from 1% of the 200 000 US military personnel in Saudi Arabia indicated that 97% experienced diarrhoea, 22% sought medical care, and 19% were not able to perform their duties while affected. Medical evaluation of 452 individuals with diarrhoea determined a bacterial aetiology in 50% and a clear relationship with consumption of local fruits and raw vegetables. Prophylactic antibiotic administration was not a reasonable proposal and treatment was effective only when susceptibility patterns of local enteric agents were considered. Research efforts must continue for diagnostic tests to indicate which individuals with diarrhoeal disease would benefit from early antibiotic therapy and for development of vaccines effective against the common agents of diarrhoeal disease. C1 USN,MED RES UNIT 3,CAIRO,EGYPT. NR 10 TC 7 Z9 7 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 DEC PY 1993 VL 87 SU 3 BP 47 EP 48 DI 10.1016/0035-9203(93)90538-2 PG 2 WC Public, Environmental & Occupational Health; Tropical Medicine SC Public, Environmental & Occupational Health; Tropical Medicine GA MM104 UT WOS:A1993MM10400012 PM 8108851 ER PT J AU SAVARINO, SJ AF SAVARINO, SJ TI ENTEROADHERENT ESCHERICHIA-COLI - A HETEROGENEOUS GROUP OF ESCHERICHIA-COLI IMPLICATED AS DIARRHEAL PATHOGENS SO TRANSACTIONS OF THE ROYAL SOCIETY OF TROPICAL MEDICINE AND HYGIENE LA English DT Article; Proceedings Paper CT Symposium on Diarrhoeal Disease : Current Concepts and Future Challenges CY JAN 06, 1993 CL LONDON, UNITED KINGDOM SP ROYAL SOC TROPI MED & HYGIENE, US NAVAL MED RES UNIT NUMBER 3, PATHOL SOC GREAT BRITAIN ID HEP-2 CELLS; PERSISTENT DIARRHEA; DIFFUSE ADHERENCE; AGGREGATIVE ADHERENCE; INFANTILE DIARRHEA; TRAVELERS DIARRHEA; HELA-CELLS; CHILDREN; STRAINS; GASTROENTERITIS AB Despite a great expansion in our knowledge of the causative agents of infectious diarrhoea over the past 20 years, a significant proportion of diarrhoeal cases remains undiagnosed. Enteroadherent Escherichia coli are a relatively recently identified group of enteric bacteria which have been implicated as diarrhoeal pathogens. These organisms, defined by their ability to adhere to human epithelial-derived tissue culture cells, have been closely studied over the past 10 years and appear to be quite heterogeneous. This review summarizes our current understanding of enteroadherent E. coli and the recognized subgroups. At least 3 distinct tissue culture cell adherence patterns have been recognized: localized adherence, characteristic of enteropathogenic E. coli, diffuse adherence, and aggregative adherence. Studies examining the epidemiological and pathogenic significance of the latter 2 groups, so-called diffusely adhering E. coli and enteroaggregative E. coli, are discussed in detail. RP SAVARINO, SJ (reprint author), USN,MED RES INST,ENTER DIS PROGRAM,BETHESDA,MD 20889, USA. NR 50 TC 19 Z9 19 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 DEC PY 1993 VL 87 SU 3 BP 49 EP 53 DI 10.1016/0035-9203(93)90539-3 PG 5 WC Public, Environmental & Occupational Health; Tropical Medicine SC Public, Environmental & Occupational Health; Tropical Medicine GA MM104 UT WOS:A1993MM10400013 PM 8108852 ER PT J AU STEVENS, DM GARTNER, SL PEARSON, RR FLYNN, ET MINK, RB ROBINSON, DH DUTKA, AJ AF STEVENS, DM GARTNER, SL PEARSON, RR FLYNN, ET MINK, RB ROBINSON, DH DUTKA, AJ TI COMPLEMENT ACTIVATION DURING SATURATION DIVING SO UNDERSEA & HYPERBARIC MEDICINE LA English DT Article DE C3A; C5A; DECOMPRESSION SICKNESS; HIGH PRESSURE NERVOUS SYNDROME ID DECOMPRESSION-SICKNESS; INJURY; C3A; C5A AB In this study, the levels of activated complement fragments C3a and C5a were measured on 11 U.S. Navy divers as they performed a 28-day saturation dive to a pressure equivalent of 1,000 feet of seawater (fsw, 31.3 atm abs). Two subjects developed symptoms consistent with the high pressure nervous syndrome (HPNS) and three were treated for type I DCS (joint pain only). These events allowed us to test two hypotheses: a) alterations in C3a or C5a levels during compression are related to the occurrence of HPNS and b) increases in complement fragments are an indicator of decompression stress associated with type I DCS. There was no correlation between changes in C3a and C5a levels during compression and the diagnosis of HPNS. Our results suggest that an increase in C3a and C5a levels during saturation diving correlates with decompression stress and the clinical diagnosis of type I DCS. RP STEVENS, DM (reprint author), USN,MED RES INST,BETHESDA,MD 20889, USA. NR 17 TC 15 Z9 16 U1 0 U2 1 PU UNDERSEA & HYPERBARIC MEDICAL SOC INC PI KENSINGTON PA 10531 METROPOLITAN AVE, KENSINGTON, MD 20895 SN 1066-2936 J9 UNDERSEA HYPERBAR M JI Undersea Hyperb. Med. PD DEC PY 1993 VL 20 IS 4 BP 279 EP 288 PG 10 WC Marine & Freshwater Biology; Medicine, Research & Experimental SC Marine & Freshwater Biology; Research & Experimental Medicine GA MJ911 UT WOS:A1993MJ91100001 PM 8286982 ER PT J AU ARNALL, DA GOFORTH, HW AF ARNALL, DA GOFORTH, HW TI FAILURE TO REDUCE BODY-WATER LOSS IN COLD-WATER IMMERSION BY GLYCEROL INGESTION SO UNDERSEA & HYPERBARIC MEDICINE LA English DT Article DE GLYCEROL; HYPERHYDRATION; COLD WATER IMMERSION; DIVERS; HUMAN SUBJECTS; NATRIURESIS; KALIURESIS; COLD ID INDUCED HYPOHYDRATION; ENDOCRINE RESPONSES; EXERCISE; VOLUME; FLUID; ENDURANCE; PLASMA; BLOOD; HYPERHYDRATION; HOMEOSTASIS AB The efficacy of ingesting an aqueous glycerol solution to enhance body water retention during prolonged cold-water dives was evaluated. Nine Naval Special Warfare divers performed a 3-h dive in 13-degrees-C water. Divers were assigned to either a water-treatment group (WT) or a glycerol-treatment (GT) group. WT ingested 30 ml water/kg lean body mass (LBM). GT ingested a solution consisting of 1.2 ml glycerol/kg LBM and 30 ml water/kg LBM. Blood was drawn at prehydration, 90 min after hydration, and 20 min after the 3-h dive for serum glycerol, glucose, free fatty acids, lactate, and electrolyte determinations. Fluid intake and output was recorded and urine analyzed for osmolality, electrolytes, and specific gravity. Serum glycerol values in GT were 200 times greater at posthydration than prehydration and 100 times greater at postdive than at prehydration. Urine output, total body weight loss, and non-urine weight loss during posthydration and dive sampling periods were not significantly different between treatment groups. Hyperhydration with an aqueous glycerol solution of 1.2 ml glycerol/kg LBM seems ineffective in significantly reducing body water loss in divers during prolonged cold-water immersion. C1 USN,HLTH RES CTR,SAN DIEGO,CA 92186. RP ARNALL, DA (reprint author), NO ARIZONA UNIV,FLAGSTAFF,AZ 86011, USA. NR 46 TC 7 Z9 8 U1 0 U2 2 PU UNDERSEA & HYPERBARIC MEDICAL SOC INC PI KENSINGTON PA 10531 METROPOLITAN AVE, KENSINGTON, MD 20895 SN 1066-2936 J9 UNDERSEA HYPERBAR M JI Undersea Hyperb. Med. PD DEC PY 1993 VL 20 IS 4 BP 309 EP 320 PG 12 WC Marine & Freshwater Biology; Medicine, Research & Experimental SC Marine & Freshwater Biology; Research & Experimental Medicine GA MJ911 UT WOS:A1993MJ91100004 PM 8286985 ER PT J AU COLTON, JS GROSSMAN, Y MILLER, K POCOTTE, SL AF COLTON, JS GROSSMAN, Y MILLER, K POCOTTE, SL TI EVALUATION OF A HYPERBARIC SYSTEM TO BE USED IN CONJUNCTION WITH A FLUOROMETER SO UNDERSEA & HYPERBARIC MEDICINE LA English DT Article DE SPECTROFLUOROMETER; HYPERBARIC CHAMBER; HIGH PRESSURE ID HIGH-PRESSURE; NEUROMUSCULAR-JUNCTION; HYDROSTATIC-PRESSURE; CALCIUM; RELEASE; SYNAPTOSOMES; GLUTAMATE AB A high-pressure chamber that can be used inside the sample chamber of a spectrofluorometer is described and some performance characteristics are presented. The chamber body, constructed of 316 stainless steel, is temperature regulated using resistive heating elements and a microprocessor-based proportional integral derivative controller. The chamber holds a standard 1-cm2 cuvette that indexes with an electromagnetic stirrer. Injection of different solutions into the closed and pressurized (6.8 MPa) vessel is accomplished by computer-controlled, low-volume solenoids attached to separate microliter injection ports. Repetitive injections of fluids down to a volume of 7 mul are possible in the pressurized chamber. Temperature stability of the chamber is +/-0.2-degrees-C at atmospheric or elevated pressure. However, during the initial phase (first 3 min) of pressurization, at a compression rate of 0.62 MPa/min, a 0.23-degrees-C/min increase in temperature occurs. The chamber windows depress the relative intensity of the emitted light by approximately 20% for visible light and 40% for near UV; however, total sensitivity of the system is sufficient to accomplish most determinations while maintaining a good signal-to-noise ratio. This system can be used to evaluate the response of several molecular and cellular events during compression and at depth with the use of various fluorometric probes. C1 BEN GURION UNIV NEGEV,DEPT PHYSIOL,IL-84105 BEER SHEVA,ISRAEL. RP COLTON, JS (reprint author), USN,NAVAL MED RES INST,DYSBAR DIS & TREATMENT,BETHESDA,MD 20889, USA. NR 17 TC 0 Z9 0 U1 0 U2 0 PU UNDERSEA & HYPERBARIC MEDICAL SOC INC PI KENSINGTON PA 10531 METROPOLITAN AVE, KENSINGTON, MD 20895 SN 1066-2936 J9 UNDERSEA HYPERBAR M JI Undersea Hyperb. Med. PD DEC PY 1993 VL 20 IS 4 BP 375 EP 382 PG 8 WC Marine & Freshwater Biology; Medicine, Research & Experimental SC Marine & Freshwater Biology; Research & Experimental Medicine GA MJ911 UT WOS:A1993MJ91100009 PM 8286990 ER PT J AU KHAVKIN, T KUCHLER, M CARL, M MURPHY, JR BAQAR, S TRIEMER, RE LIAO, MJ TESTA, D AF KHAVKIN, T KUCHLER, M CARL, M MURPHY, JR BAQAR, S TRIEMER, RE LIAO, MJ TESTA, D TI ACTIVATION AND ENHANCED CONTACT OF HUMAN T-LYMPHOCYTES WITH AUTOLOGOUS RED-BLOOD-CELLS ARE REQUIRED FOR THEIR STABLE ADHERENCE AT 37-DEGREES SO VIRCHOWS ARCHIV B-CELL PATHOLOGY INCLUDING MOLECULAR PATHOLOGY LA English DT Article ID MONOCLONAL-ANTIBODIES; ERYTHROCYTES; NEURAMINIDASE; STIMULATION; RECEPTORS AB The adherence of human red blood cells (RBC) to autologous T-cells does not occur in the body, and in vitro is elicited at 4 degrees. Autologous E-rosetting at 37 degrees has not previously been described. In this work, lymphocyte-RBC adherence has been studied in mixed leukocyte-RBC cultures and in whole blood from healthy donors. Vital, cytochemical and electron microscopic studies have shown that T-cells may form stable E-rosettes with autologous RBC at 37 degrees. As in the previously reported cold-dependent reversible resetting, stable resetting is mediated by the erythrocyte LFA3 and lymphocyte CD2 molecules. Uniquely, this phenomenon requires both T-cell activation and an enhanced contact between the T-cell and RBC membranes. These requirements were met by exposure of cell cultures to: (1) PHAE, the erythroagglutinating component of PHAP, or (2) to either non-erythroagglutinating mitogens, PHAL, Con A, OKT3 or SEA, or to antigens of typhus group rickettsiae or salmonellae, provided that the RBC membrane was desialyted. Cultures derived from individuals seropositive to rickettsiae or vaccinated with salmonellae demonstrated the adherence phenomenon after antigen exposure when neuraminidase was present in the culture medium. The system 2 described here can be used as a diagnostic tool for defining activated T-cells and T-cell clones with the memory to antigens capable of inducing cell-mediated immunity. C1 USN,MED RES INST,BETHESDA,MD. CTR VACCINE DEV,BALTIMORE,MD. RUTGERS STATE UNIV,PISCATAWAY,NJ. RP KHAVKIN, T (reprint author), INTERFERON SCI INC,783 JESEY AVE,NEW BRUNSWICK,NJ 08901, USA. NR 35 TC 0 Z9 0 U1 0 U2 0 PU SPRINGER VERLAG PI NEW YORK PA 175 FIFTH AVE, NEW YORK, NY 10010 SN 0340-6075 J9 VIRCHOWS ARCH B JI Virchows Arch. B-Cell Molec. Pathol. PD DEC PY 1993 VL 64 IS 6 BP 351 EP 359 DI 10.1007/BF02915134 PG 9 WC Pathology SC Pathology GA MU788 UT WOS:A1993MU78800004 PM 8148955 ER PT J AU COLL, AR AF COLL, AR TI POWER, PRINCIPLES, AND PROSPECTS FOR A COOPERATIVE INTERNATIONAL ORDER SO WASHINGTON QUARTERLY LA English DT Article C1 GEORGETOWN UNIV,WASHINGTON,DC 20057. USN,COLL WAR,WASHINGTON,DC 20350. NR 2 TC 1 Z9 1 U1 1 U2 1 PU MIT PRESS PI CAMBRIDGE PA 55 HAYWARD ST JOURNALS DEPT, CAMBRIDGE, MA 02142 SN 0163-660X J9 WASH QUART JI Wash. Q. PD WIN PY 1993 VL 16 IS 1 BP 5 EP 14 PG 10 WC International Relations; Law SC International Relations; Government & Law GA KC075 UT WOS:A1993KC07500001 ER PT J AU HWANG, PA TRIZNA, DB WU, J AF HWANG, PA TRIZNA, DB WU, J TI SPATIAL MEASUREMENTS OF SHORT WIND-WAVES USING A SCANNING SLOPE SENSOR SO DYNAMICS OF ATMOSPHERES AND OCEANS LA English DT Article ID SHORT GRAVITY-WAVES; INTERNAL WAVES; SURFACE-WAVES; SPECTRA; SEA; WAVENUMBER; BREAKING; SWELL AB The spatial structures of short wind-generated waves from 0.6 to 12 cm were measured with a scanning optical slope sensor and the wavenumber-frequency spectra of surface slope and curvature under various wind velocities were computed. The results show that the energy densities of both the frequency and wavenumber spectra increase with the wind-friction velocity. The rate of increase with wind-friction velocity is linear in the gravity and short capillary regions and between square to cubic in the gravity-capillary (centimeter waves) region. The drop-off of the wavenumber (k) spectrum varies from k -4 in the gravity region to k-8 in the capillary region, with a sharp break between tbe two regions occurring at the dividing wavelength from 0.8 cm at low winds to 1.6 cm at high winds. The magnitudes of the mean-square slope and mean-square curvature at various wind velocities are also presented. The fractional contribution to the mean-square slope from short waves of 0.6-12 cm in length is more than 50%, and the ratio shows an increase with wind velocity. C1 UNIV DELAWARE,AIR SEA INTERACT LAB,LEWES,DE 19958. USN,RES LAB,DIV RADAR,WASHINGTON,DC 20375. RP HWANG, PA (reprint author), QUEST INTEGRATED INC,21 414 68TH AVE S,KENT,WA 98032, USA. NR 45 TC 31 Z9 31 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0377-0265 J9 DYNAM ATMOS OCEANS JI Dyn. Atmos. Oceans PD NOV 30 PY 1993 VL 20 IS 1-2 BP 1 EP 23 DI 10.1016/0377-0265(93)90045-9 PG 23 WC Geochemistry & Geophysics; Meteorology & Atmospheric Sciences; Oceanography SC Geochemistry & Geophysics; Meteorology & Atmospheric Sciences; Oceanography GA MT486 UT WOS:A1993MT48600001 ER PT J AU CARTMILL, JW SU, MY AF CARTMILL, JW SU, MY TI BUBBLE-SIZE DISTRIBUTION UNDER SALTWATER AND FRESH-WATER BREAKING WAVES SO DYNAMICS OF ATMOSPHERES AND OCEANS LA English DT Article AB Tbe chemical composition of salt water profoundly alters the process of microbubble formation and must be accounted for in extrapolating freshwater results to the ocean environment. Results are presented of tbe measurement of bubble size distributions generated by breaking waves in both freshwater and saltwater laboratory tanks. Bubble radii in the range of 34-1200 mum were measured by an acoustic resonator at various positions and depths in a large-scale wave tank at Oregon State University. This experiment represents the first attempt to measure bubbles produced by breaking waves at this large scale in a saltwater tank. Mechanically generated wave groups, with maximum wave height of 4 ft, were used to produce breaking waves and bubble plumes comparable in scale with moderate ocean waves. During the experiment salt was added to bring the salinity of the water to 30%,. This salinity alters the nature of the bubbles produced and their subsequent evolution. An order of magnitude increase in the number density over the entire size range was observed for salt water vs. fresh water. C1 USN,RES LAB,STENNIS SPACE CTR,MISSISSIPPI STATE,MS 39529. RP CARTMILL, JW (reprint author), PLANNING SYST INC,SLIDELL,LA 70458, USA. NR 3 TC 32 Z9 32 U1 2 U2 8 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0377-0265 J9 DYNAM ATMOS OCEANS JI Dyn. Atmos. Oceans PD NOV 30 PY 1993 VL 20 IS 1-2 BP 25 EP 31 DI 10.1016/0377-0265(93)90046-A PG 7 WC Geochemistry & Geophysics; Meteorology & Atmospheric Sciences; Oceanography SC Geochemistry & Geophysics; Meteorology & Atmospheric Sciences; Oceanography GA MT486 UT WOS:A1993MT48600002 ER PT J AU TRIZNA, DB HANSEN, JP HWANG, P WU, J AF TRIZNA, DB HANSEN, JP HWANG, P WU, J TI ULTRA-WIDE-BAND RADAR STUDIES OF STEEP CRESTED WAVES WITH SCANNING LASER MEASUREMENTS OF WAVE SLOPE PROFILES SO DYNAMICS OF ATMOSPHERES AND OCEANS LA English DT Article ID WATER-WAVES; SEA; BACKSCATTER; MODERATE AB We report results of ultra wide-band radar sea spike experiments using steep and weakly breaking non-linear water surface features in a wave tank. To generate these features we used a 1 s paddle wave and wind waves for a sequence of wind speeds. A scanning laser was used to measure synchronously the surface slope profile across 12 cm along the wave propagation direction once per radar pulse. A time domain reflectometer (TDR) radar transmitted short horizontally polarized pulses at X-band, several hundred picoseconds long, to give a range resolution of 10 cm. A radar range of 36 cm was digitally sampled so that surface feature echoes could be tracked through the area continuously with 5 ms temporal resolution with each instrument. We report results considering the wave slope component in the propagation direction and the corresponding curvature component. For the conditions studied, two types of features which produce sea spike radar echoes were generated-a non-linear feature near the crest front of the wind wave, caused by extreme steepening as a result of the passage of the paddle wave, and a steepened blocked wind wave in the trough of the paddle wave, caused by the local orbital current of the 1 s wave being nearly equal to and opposite the phase velocity of the wind wave. C1 QUEST INTEGRATED INC,KENT,WA 98032. UNIV DELAWARE,AIR SEA INTERACT LAB,LEWES,DE 19958. RP TRIZNA, DB (reprint author), USN,RES LAB,DIV RADAR,WASHINGTON,DC 20375, USA. NR 11 TC 19 Z9 19 U1 0 U2 2 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0377-0265 J9 DYNAM ATMOS OCEANS JI Dyn. Atmos. Oceans PD NOV 30 PY 1993 VL 20 IS 1-2 BP 33 EP 53 DI 10.1016/0377-0265(93)90047-B PG 21 WC Geochemistry & Geophysics; Meteorology & Atmospheric Sciences; Oceanography SC Geochemistry & Geophysics; Meteorology & Atmospheric Sciences; Oceanography GA MT486 UT WOS:A1993MT48600003 ER PT J AU ZVANUT, ME CARLOS, WE PAINE, DC CARAGIANIS, C AF ZVANUT, ME CARLOS, WE PAINE, DC CARAGIANIS, C TI ATOMIC-STRUCTURE OF GE-RELATED POINT-DEFECTS IN GE-INCORPORATED OXIDE-FILMS SO APPLIED PHYSICS LETTERS LA English DT Article ID SI1-XGEX ALLOYS; OPTICAL FIBER; OXIDATION; CENTERS; MECHANISM; QUARTZ; SIGE AB Germanium-incorported oxides formed by high pressure wet oxidation of Si90Ge10 substrates are examined using electron paramagnetic resonance spectroscopy. Simulations based on the g tensor for the Ge E' center suggest that the dominant defect observed in annealed 10 Mrad irradiated samples is an oxygen vacancy at a site of a substitutional Ge atom. Comparison of thin film and bulk samples suggests that the centers found in the films are associated with hydrogen. The results presented here should be directly applicable to optical components fabricated on semiconductor substrates for photon integrated circuits. C1 USN,RES LAB,WASHINGTON,DC 20375. BROWN UNIV,DIV ENGN,PROVIDENCE,RI 02912. NR 23 TC 1 Z9 1 U1 0 U2 0 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0003-6951 J9 APPL PHYS LETT JI Appl. Phys. Lett. PD NOV 29 PY 1993 VL 63 IS 22 BP 3049 EP 3051 DI 10.1063/1.110254 PG 3 WC Physics, Applied SC Physics GA MJ819 UT WOS:A1993MJ81900022 ER PT J AU MCCLEAN, RE PASTERNACK, L AF MCCLEAN, RE PASTERNACK, L TI KINETICS OF THE REACTIONS VO(X(4)SIGMA-)+O2, NO, AND CO2 SO CHEMICAL PHYSICS LETTERS LA English DT Article ID TRANSITION-METAL ATOMS; GAS-PHASE; TEMPERATURE-DEPENDENCE; OXIDATION; TI(A3F); N2O AB The kinetics are reported for the gas-phase reactions of VO(X4SIGMA-) with O2, NO, and CO2 at 297, 394, and 531 K, and at total pressures up to 165 Torr using argon bath gas. VO was produced by the multiphoton dissociation of VOCl3(g) at 193 nm and was detected by laser-induced fluorescence. Measured rate constants for all reactions exhibited a slight negative temperature dependence, and only the VO + NO reaction was found to be pressure dependent. Results are interpreted in terms of the reactions going through an intermediate which subsequently falls apart to VO2 or collisionally stabilizes. C1 USN,RES LAB,DIV CHEM,WASHINGTON,DC 20375. NR 13 TC 2 Z9 2 U1 0 U2 2 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0009-2614 J9 CHEM PHYS LETT JI Chem. Phys. Lett. PD NOV 26 PY 1993 VL 215 IS 1-3 BP 209 EP 213 DI 10.1016/0009-2614(93)89290-X PG 5 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA MJ422 UT WOS:A1993MJ42200038 ER PT J AU CHEN, XR WANG, HX WEINER, BR HAWLEY, M NELSON, HH AF CHEN, XR WANG, HX WEINER, BR HAWLEY, M NELSON, HH TI PHOTODISSOCIATION OF DIMETHYL-SULFOXIDE AT 193 NM IN THE GAS-PHASE SO JOURNAL OF PHYSICAL CHEMISTRY LA English DT Article ID VIBRATIONAL-STATE DISTRIBUTIONS; TRIATOMIC PHOTOFRAGMENT SPECTRA; N-3S RYDBERG STATE; MULTIPHOTON IONIZATION; NO2 PHOTODISSOCIATION; ROTATIONAL-STATE; ACETONE; SPECTROSCOPY; DYNAMICS; DISSOCIATION AB The photodissociation dynamic's of the reaction (CH3)2SO + hv(193 nm) --> 2CH3 + SO have been examined by laser spectroscopic techniques. Relative vibrational and rotational state energy distributions of the nascent SO photofragment have been determined by using laser induced fluorescence spectroscopy on the (B2SIGMA--X3SIGMA-) transition. The same technique has also been employed to establish the quantum yield, PHI193[SO(X3SIGMA)] = 1.02 +/- 0.12. The nascent vibrational state distributions in the v1 and v2 modes of the methyl radical have been determined by using 2 + 1 resonance enhanced multiphoton ionization spectroscopy via the (3p2A2'' <-- 2p2A2'') transition. C1 UNIV PUERTO RICO, DEPT CHEM, BOX 23346, UPR STN, RIO PIEDRAS, PR 00931 USA. UNIV PUERTO RICO, CHEM PHYS PROGRAM, RIO PIEDRAS, PR 00931 USA. USN, DIV CHEM, WASHINGTON, DC 20375 USA. NR 34 TC 22 Z9 22 U1 1 U2 4 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0022-3654 J9 J PHYS CHEM-US JI J. Phys. Chem. PD NOV 25 PY 1993 VL 97 IS 47 BP 12269 EP 12274 DI 10.1021/j100149a029 PG 6 WC Chemistry, Physical SC Chemistry GA MH939 UT WOS:A1993MH93900029 ER PT J AU MEDHURST, LJ GARLAND, NL NELSON, HH AF MEDHURST, LJ GARLAND, NL NELSON, HH TI CH+N2-REVERSIBLE-ARROW-HCN2 - KINETIC-STUDY OF THE ADDITION CHANNEL FROM 300-K TO 1100-K SO JOURNAL OF PHYSICAL CHEMISTRY LA English DT Article ID TEMPERATURE-DEPENDENCE; REACTION CH(X2-PI)+N2(X1-SIGMA-G+)->HCN(X1-SIGMA+)+N(4S); MECHANISM; PRESSURE; MOLECULES; FLAMES AB The reaction CH + N2 reversible HCN2 has been studied using laser-induced-fluorescence detection of CH from 298 to 1075 K at 100 Torr total pressure. The experimental rate coefficient is fit by k = 44.0 x T-5.3 cm3 s-1 exp(-664.6/7). The pressure dependence was measured at 750 K, and the observed rate coefficient shows an increase from (3.2 +/- 1.8) x 10(-15) cm3 s-1 at 25 Torr to (8.0 +/- 1.8) x 10(-15) cm3 s-1 at 100 Torr. Transition-state-theory modeling indicates that recent calculations of the structure of HCN2 [Manaa, M. R.; Yarkony, D. R. Chem. Phys. Lett. 1992,188, 352; Martin, J. M. L.; Taylor, P. R. Chem. Phys. Lett. 1993, 209, 143], which is datively bonded and stabilized by approximately 29 kcal mol-1, are consistent with the data. C1 USN,DIV CHEM,CODE 6111,WASHINGTON,DC 20375. NR 24 TC 30 Z9 31 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0022-3654 J9 J PHYS CHEM-US JI J. Phys. Chem. PD NOV 25 PY 1993 VL 97 IS 47 BP 12275 EP 12281 DI 10.1021/j100149a030 PG 7 WC Chemistry, Physical SC Chemistry GA MH939 UT WOS:A1993MH93900030 ER PT J AU ROLAND, CM KALLITSIS, JK GRAVALOS, KG AF ROLAND, CM KALLITSIS, JK GRAVALOS, KG TI PLATEAU MODULUS OF EPOXIDIZED POLYBUTADIENE SO MACROMOLECULES LA English DT Article ID ENTANGLED POLYMER MELTS; GAUSS INTEGRAL MODEL; VISCOELASTIC PROPERTIES; THETA-SOLVENTS; POLYDISPERSITY AB Dynamic mechanical spectra in the terminal and plateau regions were measured for 1,4-polybutadiene (PBD) epoxidized to different degrees. The chemical modification results in a chain of increased flexibility and larger cross-sectional area. Although small, both structural changes are anticipated from current theories to contribute to reduced topological interaction among chains. Notwithstanding, the plateau modulus was observed to systematically increase with epoxidation level. The results are similar to those found previously for epoxidized polyisoprene,1 in which the effect of chemical structure on chain entanglements was also contrary to expectations. This qualitative failure of available predictions suggests that the relationship between chemical structure and entanglement interactions remains an open question. C1 UNIV PATRAS,DEPT CHEM,GR-26500 PATRAI,GREECE. RP ROLAND, CM (reprint author), USN,RES LAB,DIV CHEM,CODE 6120,WASHINGTON,DC 20375, USA. RI Kallitsis, Joannis/K-1043-2015 NR 35 TC 7 Z9 7 U1 0 U2 4 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0024-9297 J9 MACROMOLECULES JI Macromolecules PD NOV 22 PY 1993 VL 26 IS 24 BP 6474 EP 6476 DI 10.1021/ma00076a025 PG 3 WC Polymer Science SC Polymer Science GA MJ864 UT WOS:A1993MJ86400025 ER PT J AU KIM, HO LAREDO, D NETZER, DW AF KIM, HO LAREDO, D NETZER, DW TI MEASUREMENT OF SUBMICROMETER AL2O3 PARTICLES IN PLUMES SO APPLIED OPTICS LA English DT Article DE ALUMINUM OXIDE; PLUME SIGNATURE; PARTICLE SIZE; PARTICLE OPTICAL PROPERTIES AB We made multiple-wavelength light transmission measurements at the edge of a plume from a small solid-propellant motor in order to determine the mean particle size and the in situ particle index of refraction. We retrieved the particle size distribution from the Sauter mean diameter and the geometrical standard deviation assuming a lognormal distribution. The good correlation of the data indicated the applicability of the technique with a relatively high confidence level and that submicrometer particles were dominantly present at the edge of the plume. This was confirmed by the size distribution of collected particles. The values measured for alumina particles in the edge of the plume were a Sauter mean diameter of 0.150 mu m +/- 4%, a geometrical standard deviation of 1.50 +/- 3%, and a real index of refraction of 1.63 +/- 8%:. RP KIM, HO (reprint author), USN, POSTGRAD SCH, MONTEREY, CA 93943 USA. NR 14 TC 8 Z9 8 U1 0 U2 1 PU OPTICAL SOC AMER PI WASHINGTON PA 2010 MASSACHUSETTS AVE NW, WASHINGTON, DC 20036 USA SN 0003-6935 J9 APPL OPTICS JI Appl. Optics PD NOV 20 PY 1993 VL 32 IS 33 BP 6834 EP 6840 PG 7 WC Optics SC Optics GA MH575 UT WOS:A1993MH57500039 PM 20856537 ER PT J AU DUPREE, AK BRICKHOUSE, NS DOSCHEK, GA GREEN, JC RAYMOND, JC AF DUPREE, AK BRICKHOUSE, NS DOSCHEK, GA GREEN, JC RAYMOND, JC TI THE EXTREME-ULTRAVIOLET SPECTRUM OF ALPHA AURIGAE (CAPELLA) SO ASTROPHYSICAL JOURNAL LA English DT Article DE STARS, CHROMOSPHERES; STARS, GIANT; STARS, MASS LOSS; STARS, INDIVIDUAL (ALPHA-AURIGAE) ID CORONA; IRON; EMISSION; LINES; STARS; FE AB Extreme ultraviolet spectra (lambdalambda 70-740) of the bright spectroscopic binary system, Capella (Alpha Aurigae) obtained with the Extreme Ultraviolet Explorer satellite (EUVE), show a rich emission spectrum-dominated by iron emission lines: Fe XV-XXIV. The emission measure for the system reveals a continuous distribution of plasma temperatures between 10(5) and 10(7.8) K, with a clear minimum near 10' K and a local maximum at 6 x 10(6) K. Electron density diagnostics based on Fe XXI indicate N(e) almost-equal-to 4 x 10(11)-10(13) cm-3 at T(e) = 10(7) K. C1 UNIV COLORADO, CASA, BOULDER, CO 80304 USA. HARVARD SMITHSONIAN CTR ASTROPHYS, CAMBRIDGE, MA 02138 USA. USN, RES LAB, WASHINGTON, DC 20375 USA. RP NASA, WASHINGTON, DC 20546 USA. NR 40 TC 117 Z9 117 U1 0 U2 0 PU IOP PUBLISHING LTD PI BRISTOL PA TEMPLE CIRCUS, TEMPLE WAY, BRISTOL BS1 6BE, ENGLAND SN 0004-637X EI 1538-4357 J9 ASTROPHYS J JI Astrophys. J. PD NOV 20 PY 1993 VL 418 IS 1 BP L41 EP L44 DI 10.1086/187111 PN 2 PG 4 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA MF865 UT WOS:A1993MF86500011 ER PT J AU MINSCHWANER, K SISKIND, DE AF MINSCHWANER, K SISKIND, DE TI A NEW CALCULATION OF NITRIC-OXIDE PHOTOLYSIS IN THE STRATOSPHERE, MESOSPHERE, AND LOWER THERMOSPHERE SO JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES LA English DT Article ID SCHUMANN-RUNGE BANDS; OSCILLATOR-STRENGTHS; CROSS-SECTIONS; FLUORESCENCE; NO; PREDISSOCIATION; DISSOCIATION; RESOLUTION; O-2; RADIATION AB Photodissociation of nitric oxide in the middle and upper atmosphere is examined using a line-by-line approach to describe absorption in the NO delta bands and O2 Schumann-Runge bands. The new analysis Of O2 absorption results in greater transmission of ultraviolet radiation in the Schumann-Runge (5-0) band in comparison with previous studies, leading to increased rates for photolysis of nitric oxide in the delta(0-0) band. Reduced transmission in the O2 (9-0) and (10-0) Schumann-Runge bands produces smaller photolysis rates for the NO delta(1-0) band. Absorption in strong lines of the NO delta bands is shown to make a nonnegligible contribution to atmospheric opacity at wavelengths which are important for NO photodissociation. Representative distributions of nitric oxide are used to quantify possible changes in the NO photolysis rate over the course of a solar cycle. As a result of changes in the NO abundance in the thermosphere, modulation of the photolysis frequency at lower altitudes may be opposite iii phase to variations iii the solar irradiance. For solar zenith angles greater than 60-degrees, photolysis rates at altitudes below 100 km may be smaller during solar maximum compared to solar minimum. A method is described which enables rapid calculation of NO photolysis frequencies, allowing also for effects of varying opacity by nitric oxide. C1 USN, E O HULBURT CTR SPACE RES, RES LAB, WASHINGTON, DC 20375 USA. RP MINSCHWANER, K (reprint author), NATL CTR ATMOSPHER RES, POB 3000, BOULDER, CO 80307 USA. NR 48 TC 54 Z9 54 U1 1 U2 8 PU AMER GEOPHYSICAL UNION PI WASHINGTON PA 2000 FLORIDA AVE NW, WASHINGTON, DC 20009 USA SN 2169-897X J9 J GEOPHYS RES-ATMOS JI J. Geophys. Res.-Atmos. PD NOV 20 PY 1993 VL 98 IS D11 BP 20401 EP 20412 DI 10.1029/93JD02007 PG 12 WC Meteorology & Atmospheric Sciences SC Meteorology & Atmospheric Sciences GA MJ298 UT WOS:A1993MJ29800005 ER PT J AU FU, SS MALAFSKY, GP HSU, DSY AF FU, SS MALAFSKY, GP HSU, DSY TI CO ADSORPTION ON ION-BOMBARDED NI(111) - CHARACTERIZATION BY PHOTOEMISSION FROM ADSORBED XENON SO SURFACE SCIENCE LA English DT Article ID SURFACE-DEFECTS; WORK FUNCTION; PT(111); OXYGEN; PAX; XE AB The adsorption of CO on Ni(111), ion bombarded with various fluences of 1.0 keV Ar+ ions, has been investigated using photoemission from adsorbed xenon (PAX). After ion bombardment of the Ni(111) surface, various amounts of CO were adsorbed, followed by adsorption of xenon at 85 K, Two pressures of xenon were used in examining the 3d5/2 peak of xenon: 5 x 10(-6) and 7 X 10(-10) Torr. PAX data taken at both pressures show that CO selectively adsorbs onto the defect (step) sites created by ion bombardment. In addition, it was found that the amount of CO which could occupy a defect site previously occupied by one Xe atom varied from 10 to 2.5, depending on the ion fluence. C1 USN,RES LAB,DIV CHEM,WASHINGTON,DC 20375. NR 35 TC 4 Z9 4 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0039-6028 J9 SURF SCI JI Surf. Sci. PD NOV 20 PY 1993 VL 297 IS 2 BP 167 EP 174 DI 10.1016/0039-6028(93)90260-Q PG 8 WC Chemistry, Physical; Physics, Condensed Matter SC Chemistry; Physics GA MH111 UT WOS:A1993MH11100010 ER PT J AU RASPA, RF AF RASPA, RF TI COMPLICATIONS OF VASECTOMY SO AMERICAN FAMILY PHYSICIAN LA English DT Article AB Family physicians should be aware of the potential effects and complications of vasectomy so they can appropriately counsel patients seeking sterilization. Vasectomy produces anatomic, hormonal and immunologic changes and, although not substantiated by clinical studies, has been reputed to be associated with atherosclerosis, prostate cancer, testicular cancer and urolithiasis. Complications of vasectomy include overt failure, occasional sperm in the ejaculate, hematoma, bleeding, infection, sperm granuloma, congestive epididymitis, antisperm antibody formation and psychogenic impotence. Compared with tubal ligation, vasectomy has fewer serious complications and a comparable failure rate. RP RASPA, RF (reprint author), USN,HOSP NAVAL,CHARLESTON,SC 29408, USA. NR 0 TC 18 Z9 18 U1 0 U2 2 PU AMER ACAD FAMILY PHYSICIANS PI KANSAS CITY PA 8880 WARD PARKWAY, KANSAS CITY, MO 64114-2797 SN 0002-838X J9 AM FAM PHYSICIAN JI Am. Fam. Physician PD NOV 15 PY 1993 VL 48 IS 7 BP 1264 EP 1268 PG 5 WC Primary Health Care; Medicine, General & Internal SC General & Internal Medicine GA MH606 UT WOS:A1993MH60600011 PM 8237740 ER PT J AU CHANG, H AF CHANG, H TI PRIMER EXTENSION WITH A THERMOSTABLE DNA-POLYMERASE AND FLUORESCENT NUCLEOTIDES AS AN ALTERNATIVE TO CONVENTIONAL IN-SITU HYBRIDIZATION SO BLOOD LA English DT Meeting Abstract C1 USN,MED RES INST,BETHESDA,MD 20814. NR 0 TC 0 Z9 0 U1 0 U2 0 PU W B SAUNDERS CO PI PHILADELPHIA PA INDEPENDENCE SQUARE WEST CURTIS CENTER, STE 300, PHILADELPHIA, PA 19106-3399 SN 0006-4971 J9 BLOOD JI Blood PD NOV 15 PY 1993 VL 82 IS 10 SU 1 BP A516 EP A516 PG 1 WC Hematology SC Hematology GA MJ682 UT WOS:A1993MJ68202048 ER PT J AU DONAHUE, RE KESSLER, SW KIRBY, MR AGRICOLA, BA DUNBAR, CE SELLERS, SE MACKALL, CL BARE, CV GRESS, RE NIENHUIS, AW LANSDORP, PM AF DONAHUE, RE KESSLER, SW KIRBY, MR AGRICOLA, BA DUNBAR, CE SELLERS, SE MACKALL, CL BARE, CV GRESS, RE NIENHUIS, AW LANSDORP, PM TI AUTOLOGOUS BONE-MARROW TRANSPLANTATION IN NONHUMAN-PRIMATES USING A SUBPOPULATION OF CD34+ CELLS EXPRESSING THY-1 SO BLOOD LA English DT Meeting Abstract C1 NHLBI,CLIN HEMATOL BRANCH,BETHESDA,MD 20892. USN,MED RES INST,IMMUNE CELL BIOL PROGRAM,BETHESDA,MD 20814. NCI,EXPTL IMMUNOL BRANCH,BETHESDA,MD 20892. BRITISH COLUMBIA CANC RES CTR,TERRY FOX LAB,VANCOUVER V5Z 1L3,BC,CANADA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU W B SAUNDERS CO PI PHILADELPHIA PA INDEPENDENCE SQUARE WEST CURTIS CENTER, STE 300, PHILADELPHIA, PA 19106-3399 SN 0006-4971 J9 BLOOD JI Blood PD NOV 15 PY 1993 VL 82 IS 10 SU 1 BP A297 EP A297 PG 1 WC Hematology SC Hematology GA MJ682 UT WOS:A1993MJ68201174 ER PT J AU GABLE, PS SMITH, WS MILLARD, FE AF GABLE, PS SMITH, WS MILLARD, FE TI CYCLOSPORINE IN RELAPSED THROMBOTIC THROMBOCYTOPENIC PURPURA SO BLOOD LA English DT Meeting Abstract C1 USN HOSP,SAN DIEGO,CA 92134. NR 0 TC 8 Z9 8 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 NOV 15 PY 1993 VL 82 IS 10 SU 1 BP A604 EP A604 PG 1 WC Hematology SC Hematology GA MJ682 UT WOS:A1993MJ68202398 ER PT J AU MARGOLISNUNNO, H BARTLEY, A BENHUR, E HUIMABYRON, T MACGREGOR, H ROBINSON, R VALERI, CR HOROWITZ, B AF MARGOLISNUNNO, H BARTLEY, A BENHUR, E HUIMABYRON, T MACGREGOR, H ROBINSON, R VALERI, CR HOROWITZ, B TI QUENCHER MEDIATED PROTECTION OF PLATELET INTEGRITY DURING PSORALEN PHOTOINACTIVATION OF VIRUSES IN PLATELET CONCENTRATES (PC) SO BLOOD LA English DT Meeting Abstract C1 NEW YORK BLOOD CTR,NEW YORK,NY 10021. USN,BLOOD RES LAB,BOSTON,MA. NR 0 TC 4 Z9 4 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 NOV 15 PY 1993 VL 82 IS 10 SU 1 BP A401 EP A401 PG 1 WC Hematology SC Hematology GA MJ682 UT WOS:A1993MJ68201586 ER PT J AU MICHELSON, AD MACGREGOR, H BARNARD, MR KESTIN, AS VALERI, CR AF MICHELSON, AD MACGREGOR, H BARNARD, MR KESTIN, AS VALERI, CR TI ASPIRIN DOES NOT AUGMENT HYPOTHERMIA-INDUCED PLATELET DYSFUNCTION IN-VIVO SO BLOOD LA English DT Meeting Abstract C1 USN,BLOOD RES LAB,BOSTON,MA. UNIV MASSACHUSETTS,SCH MED,DEPT PEDIAT,WORCESTER,MA 01605. UNIV MASSACHUSETTS,SCH MED,DEPT SURG,WORCESTER,MA 01605. NR 0 TC 0 Z9 0 U1 0 U2 0 PU W B SAUNDERS CO PI PHILADELPHIA PA INDEPENDENCE SQUARE WEST CURTIS CENTER, STE 300, PHILADELPHIA, PA 19106-3399 SN 0006-4971 J9 BLOOD JI Blood PD NOV 15 PY 1993 VL 82 IS 10 SU 1 BP A399 EP A399 PG 1 WC Hematology SC Hematology GA MJ682 UT WOS:A1993MJ68201579 ER PT J AU MICHELSON, AD BARNARD, MR MACGREGOR, H RODINO, LJ VALERI, CR AF MICHELSON, AD BARNARD, MR MACGREGOR, H RODINO, LJ VALERI, CR TI EFFECT OF ACD CONCENTRATION AND ROTATION ON PLATELET-AGGREGATION DURING COLLECTION AND STORAGE OF PLATELET CONCENTRATES IN THE BLOOD-BANK SO BLOOD LA English DT Meeting Abstract C1 UNIV MASSACHUSETTS,SCH MED,WORCESTER,MA 01605. USN,BLOOD RES LAB,BOSTON,MA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU W B SAUNDERS CO PI PHILADELPHIA PA INDEPENDENCE SQUARE WEST CURTIS CENTER, STE 300, PHILADELPHIA, PA 19106-3399 SN 0006-4971 J9 BLOOD JI Blood PD NOV 15 PY 1993 VL 82 IS 10 SU 1 BP A399 EP A399 PG 1 WC Hematology SC Hematology GA MJ682 UT WOS:A1993MJ68201578 ER PT J AU MICHELSON, AD BARNARD, MR MACGREGOR, H VALERI, CR AF MICHELSON, AD BARNARD, MR MACGREGOR, H VALERI, CR TI PROCOAGULANT ACTIVITY OF PLATELET-DERIVED MICROPARTICLES FORMED DURING STORAGE OF PLATELET CONCENTRATES SO BLOOD LA English DT Meeting Abstract C1 UNIV MASSACHUSETTS,SCH MED,WORCESTER,MA 01605. USN,BLOOD RES LAB,BETHESDA,MD. NR 0 TC 0 Z9 0 U1 0 U2 0 PU W B SAUNDERS CO PI PHILADELPHIA PA INDEPENDENCE SQUARE WEST CURTIS CENTER, STE 300, PHILADELPHIA, PA 19106-3399 SN 0006-4971 J9 BLOOD JI Blood PD NOV 15 PY 1993 VL 82 IS 10 SU 1 BP A337 EP A337 PG 1 WC Hematology SC Hematology GA MJ682 UT WOS:A1993MJ68201330 ER PT J AU SCHWARTZ, GN WARREN, MK KESSLER, SW DE, M SZABO, JM PERDUE, JF AF SCHWARTZ, GN WARREN, MK KESSLER, SW DE, M SZABO, JM PERDUE, JF TI INSULIN-LIKE GROWTH FACTOR-II (IGF-II) ENHANCED CYTOKINE-INDUCED PROLIFERATION AND DIFFERENTIATION OF MYELOID AND MEGAKARYOCYTE PROGENITOR CELLS IN SERUM-DEPRIVED LIQUID CULTURES OF CD34+ BONE-MARROW CELLS SO BLOOD LA English DT Meeting Abstract C1 NCI,BETHESDA,MD 20892. USN,MED RES INST,BETHESDA,MD 20814. AMER PHARM INC,ROCKVILLE,MD. AMER RED CROSS,BETHESDA,MD 20814. NR 0 TC 0 Z9 0 U1 0 U2 0 PU W B SAUNDERS CO PI PHILADELPHIA PA INDEPENDENCE SQUARE WEST CURTIS CENTER, STE 300, PHILADELPHIA, PA 19106-3399 SN 0006-4971 J9 BLOOD JI Blood PD NOV 15 PY 1993 VL 82 IS 10 SU 1 BP A103 EP A103 PG 1 WC Hematology SC Hematology GA MJ682 UT WOS:A1993MJ68200395 ER PT J AU SMITH, WS SUMNICHT, GE SHARPE, RW SAMUELSON, D MILLARD, FE AF SMITH, WS SUMNICHT, GE SHARPE, RW SAMUELSON, D MILLARD, FE TI GRANULOCYTE-COLONY-STIMULATING FACTOR (GCSF) VS PLACEBO IN ADDITION TO PENICILLIN-G IN A RANDOMIZED, BLINDED STUDY OF A GRAM-NEGATIVE PNEUMONIA MODEL OF SEPSIS - ANALYSIS OF SURVIVAL AND MULTISYSTEM ORGAN FAILURE SO BLOOD LA English DT Meeting Abstract C1 USN,MED CTR,SAN DIEGO,CA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU W B SAUNDERS CO PI PHILADELPHIA PA INDEPENDENCE SQUARE WEST CURTIS CENTER, STE 300, PHILADELPHIA, PA 19106-3399 SN 0006-4971 J9 BLOOD JI Blood PD NOV 15 PY 1993 VL 82 IS 10 SU 1 BP A233 EP A233 PG 1 WC Hematology SC Hematology GA MJ682 UT WOS:A1993MJ68200916 ER PT J AU XU, LC BLANCO, M STAHL, SK KESSLER, S DUNBAR, C KARLSSON, S AF XU, LC BLANCO, M STAHL, SK KESSLER, S DUNBAR, C KARLSSON, S TI CORRECTION OF THE ENZYME DEFICIENCY IN HEMATOPOIETIC-CELLS OF GAUCHER PATIENTS USING A CLINICALLY ACCEPTABLE RETROVIRAL SUPERNATANT TRANSDUCTION PROTOCOL SO BLOOD LA English DT Meeting Abstract C1 NINCDS,DEV & METAB NEUROL BRANCH,BETHESDA,MD 20892. NHLBI,CLIN HEMATOL BRANCH,BETHESDA,MD 20892. USN,MED RES INST,IMMUNE CELL BIOL PROGRAM,BETHESDA,MD 20814. NR 0 TC 1 Z9 1 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 NOV 15 PY 1993 VL 82 IS 10 SU 1 BP A217 EP A217 PG 1 WC Hematology SC Hematology GA MJ682 UT WOS:A1993MJ68200852 ER PT J AU KRALL, AD GLANCY, BC SANDUSKY, HW AF KRALL, AD GLANCY, BC SANDUSKY, HW TI MICROWAVE INTERFEROMETRY OF SHOCK-WAVES .1. UNREACTING POROUS-MEDIA SO JOURNAL OF APPLIED PHYSICS LA English DT Article AB Microwave interferometry appears to be a promising method for the study of wave and mass velocity in shocked dielectric materials. This paper discusses the mathematics concerning the frequencies and amplitudes in the microwave reflections from the shock wave and from an impacting piston which drives the shock into a nonreacting porous solid. Methods for the determination of the state variables in the compressed region between the shock wave and the piston are given. In this paper, these methods have been confirmed by experimental measurements in nonenergetic materials in which there is no ionization from chemical reaction. The microwave reflection from the shock wave traveling through an inert media is shown to result from a dielectric discontinuity at the wave front. Studies on energetic materials (explosives and propellants) are considered in a companion paper where ionization associated with the chemical reactions is required to explain the increased reflection from the shock front. C1 USN,CTR SURFACE WARFARE,SILVER SPRING,MD 20903. RP KRALL, AD (reprint author), ADV TECHNOL & RES INC,15210 DINO DR,BURTONSVILLE,MD 20866, USA. NR 14 TC 7 Z9 8 U1 1 U2 4 PU AMER INST PHYSICS PI MELVILLE PA CIRCULATION & FULFILLMENT DIV, 2 HUNTINGTON QUADRANGLE, STE 1 N O 1, MELVILLE, NY 11747-4501 USA SN 0021-8979 J9 J APPL PHYS JI J. Appl. Phys. PD NOV 15 PY 1993 VL 74 IS 10 BP 6322 EP 6327 DI 10.1063/1.355154 PG 6 WC Physics, Applied SC Physics GA MF840 UT WOS:A1993MF84000064 ER PT J AU GLANCY, BC SANDUSKY, HW KRALL, AD AF GLANCY, BC SANDUSKY, HW KRALL, AD TI MICROWAVE INTERFEROMETRY OF SHOCK-WAVES .2. REACTING POROUS-MEDIA SO JOURNAL OF APPLIED PHYSICS LA English DT Article AB Shocked porous ball powders have been investigated by means of microwave interferometric techniques. Equations developed for interferometric measurements on inert materials apply for energetic materials until reaction at the shock front begins. As reaction begins, the microwave interferometer (MI) output exhibits characteristic changes in both the absorption and reflection of the microwave signal. These changes have been related to hot spot development at the shock front. The hot spots in a reacting bed have been experimentally approximated to a first order by including metallic particles in unreacting beds and measuring their effects on the propagation of microwaves. With the aid of dielectric measurements of the metallized beds, hot spot concentrations as a function of time were predicted from the MI output of reacting beds. C1 ADV TECHNOL & RES INC,BURTONSVILLE,MD 20866. RP GLANCY, BC (reprint author), USN,CTR SURFACE WARFARE,SILVER SPRING,MD 20903, USA. NR 18 TC 4 Z9 5 U1 1 U2 4 PU AMER INST PHYSICS PI MELVILLE PA CIRCULATION & FULFILLMENT DIV, 2 HUNTINGTON QUADRANGLE, STE 1 N O 1, MELVILLE, NY 11747-4501 USA SN 0021-8979 J9 J APPL PHYS JI J. Appl. Phys. PD NOV 15 PY 1993 VL 74 IS 10 BP 6328 EP 6334 DI 10.1063/1.355155 PG 7 WC Physics, Applied SC Physics GA MF840 UT WOS:A1993MF84000065 ER PT J AU PAGE, M SOTO, MR AF PAGE, M SOTO, MR TI RADICAL-ADDITION TO HNO - AB-INITIO REACTION-PATH AND VARIATIONAL TRANSITION-STATE THEORY CALCULATIONS FOR H+HNO-]H-2NO AND H+HNO-]HNOH SO JOURNAL OF CHEMICAL PHYSICS LA English DT Article ID COMBUSTION AB Features of the potential energy surface for hydrogen atom addition to both the nitrogen atom and the oxygen atom of HNO have been investigated at high levels of ab initio theory. For both reactions, vibrational frequencies, moments of inertia, and energies were determined along steepest descent paths at the multiconfigurational self-consistent field level of theory, correlating all valence electrons except the 2s electrons on oxygen (complete active space multiconfigurational self-consistent field distributing 11 electrons among 9 active orbitals). Energies were refined along these reaction pathways using large-scale multireference configuration interaction calculations (all single and double excitations from all configurations generated by a five-electron-in-four-orbital reference space) and large basis sets (correlation-consistent polarized valence triple zeta). The calculated barriers for H-atom addition to the nitrogen atom and the oxygen atom of HNO are 2.68 and 8.99 kcal/mol, respectively. Because of the relatively large barrier for addition to the oxygen atom of HNO, this channel cannot compete with addition to the nitrogen to form the H2NO radical. However, the HNOH radical can likely be formed indirectly by a 1,2 hydrogen migration. Variational transition state theory rate calculations performed over a wide range of temperatures using the ab initio potential energy surface information as input show a substantial variational effect for the calculated association rate constant. The rate of H + HNO association to form a radical complex is slower than the rate of hydrogen atom abstraction at all temperatures; by a factor of more than 20 at room temperature to about a factor of 3 at 2000 K. C1 USN,RES LAB,COMPUTAT PHYS & FLUID DYNAM LAB,WASHINGTON,DC 20375. RP PAGE, M (reprint author), N DAKOTA STATE UNIV,DEPT CHEM,FARGO,ND 58105, USA. NR 24 TC 15 Z9 15 U1 1 U2 2 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 NOV 15 PY 1993 VL 99 IS 10 BP 7709 EP 7717 DI 10.1063/1.465700 PG 9 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA MH744 UT WOS:A1993MH74400044 ER PT J AU SNAPPER, CM YAMAGUCHI, H MOORMAN, MA SNEED, R SMOOT, D MOND, JJ AF SNAPPER, CM YAMAGUCHI, H MOORMAN, MA SNEED, R SMOOT, D MOND, JJ TI NATURAL-KILLER-CELLS INDUCE ACTIVATED MURINE B-CELLS TO SECRETE IG SO JOURNAL OF IMMUNOLOGY LA English DT Article ID LARGE GRANULAR LYMPHOCYTES; STIMULATORY FACTOR-I; T-CELL; INTERFERON-GAMMA; MONOCLONAL-ANTIBODY; NK CELLS; IMMUNOGLOBULIN-SYNTHESIS; SCID MICE; IFN-GAMMA; INTERLEUKIN-2 AB We previously demonstrated that dextran-conjugated anti-IgD antibodies (alphadelta-dex) induce proliferation of small, B cell-enriched murine spleen cells (B(e) cells), and in the presence of IL-2, stimulate Ig secretion in vitro. We have shown that alphadelta-dex-stimulated B cells provide an in vitro model for studying B cell activation by T cell-independent type 2 (TI-2) Ag, as exemplified by the bacterial polysaccharides. We now show that highly purified resting B cells, obtained by electronic cell sorting (B(sp) cells), fail to secrete Ig in the presence of alphadelta-dex + IL-2. The alphadelta-dex + IL-2-induced Ig secretory response of B(sp) cells is restored upon addition of splenic non-B, non-T cells or a pure population of in vitro-generated NK cells. Similarly, pretreatment of B(e) cells with anti-AsGm-1 plus complement inhibits Ig secretion in response to alphadelta-dex + IL-2. An IL-2-induced NK cell supernatant (NKSN) is equally potent at stimulating Ig secretion by alphadelta-dex-activated BsP cells, indicating that cell contact between B(sp) and activated NK cells is not required for this effect. IL-2 stimulates not only NK cells, but B cells as well, since addition of anti-IL-2 + anti-IL-2R antibodies to B(sp) cell cultures, in the presence of alphadelta-dex + NKSN, inhibits Ig secretion. These data describe a novel animal model for NK cell-induced B cell maturation to Ig secretion and suggest a pathway for Ig production in response to TI-2 Ag. C1 UNIFORMED SERV UNIV HLTH SCI,DEPT MED,BETHESDA,MD 20814. UNIFORMED SERV UNIV HLTH SCI,CTR BIOMED INSTRUMENTAT,BETHESDA,MD 20814. GEOCENTERS INC,FT WASHINGTON,MD 20744. USN,MED RES INST,IMMUNE CELL BIOL PROGRAM,BETHESDA,MD 20889. RP SNAPPER, CM (reprint author), UNIFORMED SERV UNIV HLTH SCI,DEPT PATHOL,4301 JONES BRIDGE RD,BETHESDA,MD 20814, USA. FU NIAID NIH HHS [AI32560]; PHS HHS [A127465] NR 40 TC 67 Z9 67 U1 0 U2 0 PU AMER ASSOC IMMUNOLOGISTS PI BETHESDA PA 9650 ROCKVILLE PIKE, BETHESDA, MD 20814 SN 0022-1767 J9 J IMMUNOL JI J. Immunol. PD NOV 15 PY 1993 VL 151 IS 10 BP 5251 EP 5260 PG 10 WC Immunology SC Immunology GA MF995 UT WOS:A1993MF99500014 PM 8228222 ER PT J AU HARIHAR, P CHEN, H STAPOR, WJ KNUDSON, AR AF HARIHAR, P CHEN, H STAPOR, WJ KNUDSON, AR TI SCINTILLATION DECAYS IN A TRANS-STILBENE CRYSTAL SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article AB Scintillation decay times for nuclear radiations in a trans-stilbene crystal were measured using a transient digitizer [P. Harihar et al., Bull. Am. Phys. Soc. 36 (1991) 1680]. The results show [H. Chen et al., Bull. Am. Phys. Soc. 37 (1992) 1871; Bull. Am. Phys. Soc. Trans., to be published) that the decay time of the slow component increases with the specific energy loss (dE/dx), while the fast component is relatively insensitive to it. C1 USN, RES LAB, WASHINGTON, DC 20375 USA. RP HARIHAR, P (reprint author), UMASS LOWELL, DEPT PHYS & APPL PHYS, LOWELL, MA 01854 USA. NR 4 TC 10 Z9 10 U1 1 U2 3 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-9002 EI 1872-9576 J9 NUCL INSTRUM METH A JI Nucl. Instrum. Methods Phys. Res. Sect. A-Accel. Spectrom. Dect. Assoc. Equip. PD NOV 15 PY 1993 VL 336 IS 1-2 BP 176 EP 178 DI 10.1016/0168-9002(93)91094-4 PG 3 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA MG766 UT WOS:A1993MG76600021 ER PT J AU HARPER, MJ RICH, JC AF HARPER, MJ RICH, JC TI RADIATION-INDUCED NUCLEATION IN SUPERHEATED LIQUID DROPLET NEUTRON DETECTORS SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article AB Superheated liquid droplet (''bubble'') dosimeters are relatively new devices which utilize the nucleation of liquid droplets to detect neutrons. A theoretical model was developed to predict the response of such detectors to both polyenergetic and monoenergetic thermal neutron fluxes. Experiments were conducted with spontaneous fission neutron sources as well as purely thermal neutrons at the National Institute of Standards and Technology, confirming the model. Additionally, an inhibition temperature was predicted, below which no response to thermal neutrons is expected. Data was obtained to verify this prediction. C1 UNIV CALIF BERKELEY,DEPT NUCL ENGN,BERKELEY,CA 94720. RP HARPER, MJ (reprint author), USN ACAD,DEPT NAVAL ARCHITECTURE OCEAN & MARINE ENGN,590 HOLLOWAY RD,ANNAPOLIS,MD 21402, USA. NR 14 TC 36 Z9 36 U1 0 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-9002 J9 NUCL INSTRUM METH A JI Nucl. Instrum. Methods Phys. Res. Sect. A-Accel. Spectrom. Dect. Assoc. Equip. PD NOV 15 PY 1993 VL 336 IS 1-2 BP 220 EP 225 DI 10.1016/0168-9002(93)91101-R PG 6 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA MG766 UT WOS:A1993MG76600028 ER PT J AU SIMON, U TITTEL, FK GOLDBERG, L AF SIMON, U TITTEL, FK GOLDBERG, L TI DIFFERENCE-FREQUENCY MIXING IN AGGAS2 BY USE OF A HIGH-POWER GAALAS TAPERED SEMICONDUCTOR AMPLIFIER AT 860 NM SO OPTICS LETTERS LA English DT Article ID LASER SPECTROMETER; INJECTION LOCKING; GENERATION; DIODE AB As much as 47 muW of cw infrared radiation and 89 muW of pulsed infrared radiation, tunable near 4.3 mum, have been generated by mixing the outputs of a high-power tapered semiconductor amplifier at 858 nm (signal wave) and a Ti:Al2O3 laser at 715 nm (pump wave) in AgGaS2. The GaAlAs tapered traveling-wave amplifier delivered as much as 1.5 W of diffraction-limited cw power into the nonlinear crystal. Output powers, conversion efficiencies, and spectral characteristics of this novel midinfrared source are discussed. C1 USN,RES LAB,WASHINGTON,DC 20375. RP SIMON, U (reprint author), RICE UNIV,DEPT ELECT & COMP ENGN,HOUSTON,TX 77251, USA. NR 11 TC 29 Z9 30 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 NOV 15 PY 1993 VL 18 IS 22 BP 1931 EP 1933 DI 10.1364/OL.18.001931 PG 3 WC Optics SC Optics GA MF579 UT WOS:A1993MF57900018 PM 19829451 ER PT J AU SIRKIS, JS BRENNAN, DD PUTMAN, MA BERKOFF, TA KERSEY, AD FRIEBELE, EJ AF SIRKIS, JS BRENNAN, DD PUTMAN, MA BERKOFF, TA KERSEY, AD FRIEBELE, EJ TI IN-LINE FIBER ETALON FOR STRAIN-MEASUREMENT SO OPTICS LETTERS LA English DT Article AB A description and demonstration of a fiber interferometer that uses a short segment of silica hollow-core fiber spliced between two sections of single-mode fiber to form a mechanically robust in-line cavity are presented. The hollow-core fiber is specifically manufactured to have an outer diameter that is equal to the outer diameter of the single-mode lead fibers, thereby combining the best qualities of existing intrinsic and extrinsic Fabry-Perot sensors. A dynamic strain resolution of approximately 22 nepsilon/square-root Hz at frequencies of >5 Hz with a sensor gauge length of 137 mum is demonstrated. C1 VIRGINIA POLYTECH INST & STATE UNIV,DEPT ELECT ENGN,BLACKSBURG,VA 24061. SFA INC,LANDOVER,MD 20785. USN,RES LAB,DIV OPT SCI,CODE 5612,WASHINGTON,DC 20375. RP SIRKIS, JS (reprint author), UNIV MARYLAND,DEPT MECH ENGN,COLL PK,MD 20742, USA. NR 8 TC 66 Z9 68 U1 1 U2 11 PU OPTICAL SOC AMER PI WASHINGTON PA 2010 MASSACHUSETTS AVE NW, WASHINGTON, DC 20036 SN 0146-9592 J9 OPT LETT JI Opt. Lett. PD NOV 15 PY 1993 VL 18 IS 22 BP 1973 EP 1975 DI 10.1364/OL.18.001973 PG 3 WC Optics SC Optics GA MF579 UT WOS:A1993MF57900032 PM 19829465 ER PT J AU KLAFTER, J ZUMOFEN, G SHLESINGER, MF AF KLAFTER, J ZUMOFEN, G SHLESINGER, MF TI LEVY WALKS IN DYNAMICAL-SYSTEMS SO PHYSICA A-STATISTICAL MECHANICS AND ITS APPLICATIONS LA English DT Article ID LONG-TIME CORRELATIONS; ANOMALOUS DIFFUSION; ENHANCED DIFFUSION; ACCELERATOR MODES; CHAOTIC SYSTEMS; TURBULENCE; REGIME AB We investigate anomalous diffusion generated by iterated maps and analyze the motion in terms of the probabilistic Levy walks. We present expressions for the mean-squared displacement and for the propagator, which deviate from those for Brownian motion. The theoretical results are corroborated by numerical calculations. C1 TEL AVIV UNIV, SCH CHEM, IL-69978 TEL AVIV, ISRAEL. SWISS FED INST TECHNOL, PHYS CHEM LAB, CH-8092 ZURICH, SWITZERLAND. OFF NAVAL RES, DIV PHYS, ARLINGTON, VA 22217 USA. RP MIT, DEPT CHEM, CAMBRIDGE, MA 02139 USA. NR 26 TC 10 Z9 10 U1 0 U2 6 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0378-4371 EI 1873-2119 J9 PHYSICA A JI Physica A PD NOV 15 PY 1993 VL 200 IS 1-4 BP 222 EP 230 DI 10.1016/0378-4371(93)90520-E PG 9 WC Physics, Multidisciplinary SC Physics GA MJ558 UT WOS:A1993MJ55800023 ER PT J AU SINGH, DJ AF SINGH, DJ TI WEIGHTED-DENSITY-APPROXIMATION GROUND-STATE STUDIES OF SOLIDS SO PHYSICAL REVIEW B LA English DT Article ID GENERALIZED-GRADIENT-APPROXIMATION; INHOMOGENEOUS ELECTRON-SYSTEMS; TRANSITION-METAL MONOXIDES; AUGMENTED-PLANE-WAVE; NONLOCAL EXCHANGE; BRILLOUIN-ZONE; FUNCTIONAL CALCULATIONS; CORRELATION-ENERGY; BAND-STRUCTURE; SPECIAL POINTS AB Weighted-density-approximation calculations of ground-state properties of diamond, Si, GaAs, V, and Mo, using two different forms of the coupling-constant averaged pair-correlation function, gBAR, are reported. Substantial improvements over the local-density approximation are found for all materials when a form of gBAR that accurately models the uniform electron gas is used. RP SINGH, DJ (reprint author), USN,RES LAB,COMPLEX SYST THEORY BRANCH,WASHINGTON,DC 20375, USA. RI Singh, David/I-2416-2012 NR 42 TC 33 Z9 33 U1 0 U2 2 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD NOV 15 PY 1993 VL 48 IS 19 BP 14099 EP 14103 DI 10.1103/PhysRevB.48.14099 PG 5 WC Physics, Condensed Matter SC Physics GA MJ065 UT WOS:A1993MJ06500007 ER PT J AU CROOKHAM, HC GLASER, ER HENRY, RL KENNEDY, TA AF CROOKHAM, HC GLASER, ER HENRY, RL KENNEDY, TA TI OPTICALLY DETECTED MAGNETIC-RESONANCE IN ZINC-DOPED INDIUM-PHOSPHIDE UNDER UNIAXIAL-STRESS SO PHYSICAL REVIEW B LA English DT Article ID ELECTRON-PARAMAGNETIC RESONANCE; NUCLEAR DOUBLE-RESONANCE; PIN ANTISITE; INP AB Optically detected magnetic resonance (ODMR) of Zn-doped InP under uniaxial stress reveals the spectrum of the Zn acceptors. The zero-stress spectrum consists of a strong ODMR from native P(In) antisites. Uniaxial stress was applied in the [110BAR] direction perpendicular to the magnetic field. With the magnetic field in the [110BAR], a new resonance appears for a stress of 160 MPa, which sharpens and shifts as the stress is increased to 400 MPa. The anisotropy of the signal was measured by performing the experiment with the field in the [001] direction. An analysis in terms of a Hamiltonian for a spin-3/2 acceptor gives g1 = 0.869(3) and g2 = 0.031(2) at 400 MPa. These values are compared to those for Zn in other III-V semiconductors and to a measurement of the Luttinger parameter for InP. This observation confirms the assignment of the 0.80-eV emission in InP:Zn to P(IN)-Zn pairs. When this result is combined with the published result from excitation spectroscopy, the P(In)+/P(In)2+ energy level is (1.1+/-0.1) eV above the valence band. C1 USN,RES LAB,WASHINGTON,DC 20375. NR 18 TC 2 Z9 2 U1 0 U2 2 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD NOV 15 PY 1993 VL 48 IS 19 BP 14157 EP 14160 DI 10.1103/PhysRevB.48.14157 PG 4 WC Physics, Condensed Matter SC Physics GA MJ065 UT WOS:A1993MJ06500015 ER PT J AU PICKETT, WE BROUGHTON, JQ AF PICKETT, WE BROUGHTON, JQ TI VARIATIONAL MONTE-CARLO STUDY OF THE PARTIALLY POLARIZED ELECTRON-GAS SO PHYSICAL REVIEW B LA English DT Article ID NONLOCAL PSEUDOPOTENTIAL APPROACH; GROUND-STATE; DIAMOND; SILICON; SOLIDS AB The variational Monte Carlo (VMC) method, using Jastrow-Slater (JS) wave functions, is used to study the partially polarized interacting electron gas for densities spanning the range encountered in bulk metals. We concentrate on a spin polarization zeta=0.42 which allows direct comparison of polarized and unpolarized states for a fixed total number of electrons in the simulation supercell. The radial distribution functions g(++)(r), g(__)(r), and g(+_)(r) are given particular attention and compared with a model developed by Perdew and Wang (PW) that satisfies known constraints. At high density the agreement with the PW model is good. At the lower densities (electron-gas parameter r(s)=4-8) there are differences that can be roughly characterized as the PW model giving a somewhat more extended exchange-correlation hole than the VMC calculations. These discrepancies could be due to limitations either of the PW model or of the JS wave functions used here. Both the VMC and PW results are contrasted with the Hartree-Fock result for parallel spins. RP PICKETT, WE (reprint author), USN,RES LAB,COMPLEX SYST THEORY BRANCH,CODE 6690,WASHINGTON,DC 20375, USA. NR 19 TC 24 Z9 24 U1 0 U2 1 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1098-0121 J9 PHYS REV B JI Phys. Rev. B PD NOV 15 PY 1993 VL 48 IS 20 BP 14859 EP 14867 DI 10.1103/PhysRevB.48.14859 PG 9 WC Physics, Condensed Matter SC Physics GA MK540 UT WOS:A1993MK54000008 ER PT J AU KLEIN, N TELLMANN, N SCHULZ, H URBAN, K WOLF, SA KRESIN, VZ AF KLEIN, N TELLMANN, N SCHULZ, H URBAN, K WOLF, SA KRESIN, VZ TI EVIDENCE OF 2-GAP S-WAVE SUPERCONDUCTIVITY IN YBA2CU3O7-X FROM MICROWAVE SURFACE IMPEDANCE MEASUREMENTS SO PHYSICAL REVIEW LETTERS LA English DT Article ID THIN-FILMS; STATE; RESISTIVITY; ANISOTROPY; CRYSTALS AB Epitaxial thin films of YBa2Cu3O7-x with low cation and oxygen disorder exhibit two features in the temperature dependence of the microwave surface impedance which are consistent with a weak s-wave superconducting state associated with the CuO chains. First, both the microwave surface resistance and the magnetic field penetration depth exhibit a weak exponential temperature dependence below 30 K corresponding to an energy gap of about 6 meV. Second, the penetration depth exhibits a small bump at about 60 K, which is consistent with a two-band BCS calculation using 6 meV for the smaller gap. C1 USN, RES LAB, WASHINGTON, DC 20375 USA. UNIV CALIF BERKELEY, BERKELEY, CA 94720 USA. RP FORSCHUNGSZENTRUM JULICH, FORSCHUNGSZENTRUM, INST FESTKORPERFORSCH, D-52425 JULICH, GERMANY. RI Wolf, Stuart/A-7513-2009; Klein, Norbert/C-1473-2017 NR 29 TC 152 Z9 152 U1 3 U2 7 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 NOV 15 PY 1993 VL 71 IS 20 BP 3355 EP 3358 DI 10.1103/PhysRevLett.71.3355 PG 4 WC Physics, Multidisciplinary SC Physics GA MG669 UT WOS:A1993MG66900031 ER PT J AU PARK, DS LADD, DM HENDRICKS, EW AF PARK, DS LADD, DM HENDRICKS, EW TI FEEDBACK-CONTROL OF A GLOBAL MODE IN SPATIALLY DEVELOPING FLOWS SO PHYSICS LETTERS A LA English DT Article ID INSTABILITIES; SELECTION AB We present the results of feedback control of a global oscillatory mode of a Ginzburg-Landau equation with a spatially varying linear growth rate coefficient as a model for spatially developing flows such as jets and wakes. RP PARK, DS (reprint author), USN,CTR COMMAND CONTROL & OCEAN SURVEILLANCE,DIV RDT&E,SAN DIEGO,CA 92152, USA. NR 11 TC 25 Z9 25 U1 0 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0375-9601 J9 PHYS LETT A JI Phys. Lett. A PD NOV 15 PY 1993 VL 182 IS 2-3 BP 244 EP 248 DI 10.1016/0375-9601(93)91065-D PG 5 WC Physics, Multidisciplinary SC Physics GA MH384 UT WOS:A1993MH38400013 ER PT J AU GAUME, RA JOHNSTON, KJ WILSON, TL AF GAUME, RA JOHNSTON, KJ WILSON, TL TI HIGH-RESOLUTION CENTIMETER RADIO-CONTINUUM AND AMMONIA MASER OBSERVATIONS OF THE W51 REGION OF STAR-FORMATION SO ASTROPHYSICAL JOURNAL LA English DT Article DE H-II REGIONS; ISM, INDIVIDUAL (W51); ISM, MOLECULES; ISM, STRUCTURE; MASERS; RADIO CONTINUUM, INTERSTELLAR ID H-II REGIONS; VLA OBSERVATIONS; PROPER MOTIONS; INFRARED LINE; EMISSION; G34.3+0.2; DISTANCES; SPECTRUM; CORE AB High angular resolution and high-sensitivity observations at wavelengths of 1.3 and 3.6 cm have detected three new ultracompact emission regions in the core of the W51 (regions d and e). In total, five ultracompact continuum objects of diameter less than 300 to 3000 AU are located in W51 d and e. These sources may best be explained as photoionized stellar winds. This suggests that there may exist a quasi-stable point in early stellar evolution where observable H II regions are formed by stellar winds around massive stars. These observations demonstrate that the taxonomy of H II region classification may be heavily affected by sensitivity, and a lack of complete spatial sampling by interferometric mapping. For example, the W51 d region, previously classified as cometary, is shown by our higher resolution and sensitivity observations also to have the properties normally associated with shell-like regions. These new observations suggest that the bow shock model, which is suggested to explain the morphology of cometary H II regions, but cannot explain shell sources, does not fully explain the W51 d H II region. The J, K = (9, 8) NH3 maser associated with W51 d has been shown to have a minimum brightness temperature of 2.7 x 10(6) K. This maser is most probably saturated. C1 MAX PLANCK INST RADIOASTRON,W-5300 BONN 1,GERMANY. RP GAUME, RA (reprint author), USN,RES LAB,CTR ADV SPACE SENSING,CODE 7200,WASHINGTON,DC 20375, USA. NR 40 TC 53 Z9 53 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 NOV 10 PY 1993 VL 417 IS 2 BP 645 EP 654 DI 10.1086/173342 PN 1 PG 10 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA MD971 UT WOS:A1993MD97100023 ER PT J AU ULMER, MP MATZ, SM WILSON, RB FINGER, MJ HAGEDON, KS GRABELSKY, DA GROVE, JE JOHNSON, WN KINZER, RL KURFESS, JD PURCELL, WR STRICKMAN, MS KASPI, VM JOHNSTON, S MANCHESTER, RN LYNE, AG DAMICO, N AF ULMER, MP MATZ, SM WILSON, RB FINGER, MJ HAGEDON, KS GRABELSKY, DA GROVE, JE JOHNSON, WN KINZER, RL KURFESS, JD PURCELL, WR STRICKMAN, MS KASPI, VM JOHNSTON, S MANCHESTER, RN LYNE, AG DAMICO, N TI GAMMA-RAY AND RADIO OBSERVATIONS OF PSR B1509-58 SO ASTROPHYSICAL JOURNAL LA English DT Article DE GAMMA-RAYS, OBSERVATIONS; PULSARS, INDIVIDUAL (PSR B1509-58); RADIO CONTINUUM, STARS ID X-RAY; PULSAR AB We report concurrent radio and gamma-ray observations of PSR B1509-58 carried out by the Parkes Radio Telescope and by the Burst and Transient Source Experiment (BATSE) and the Oriented Scintillation Spectrometer Experiment (OSSE) on the Compton Gamma-Ray Observatory (CGRO). Gamma-ray light curves fitted at several energies between approximately 20 and 500 keV yield a phase offset with respect to the radio pulse that is independent of energy, with an average value 0.32 +/- 0.02. Although this value is larger by 0.07 than that reported by Kawai et al., the difference is not statistically significant (only approximately 2 simga) when account is taken of the uncertainty associated with their result. We briefly discuss the possibility that the energy independence of the gamma-ray pulse phase is a signature of nonthermal radiation in the X-ray/gamma-ray range and the suggestion of a dependence of pulsar radio-gamma-ray phase offset on pulse period. C1 COMP SCI CORP,ASTRON PROGRAMS,LOS ANGELES,CA 90045. EO HULBURT CTR SPACE RES,NRL,WASHINGTON,DC. UNIV MANCHESTER,DEPT PHYS,MACCLESFIELD SK11 9DL,ENGLAND. UNIV PALERMO,IST FIS,I-40126 BOLOGNA,ITALY. CNR,IST RADIOASTRON,I-40126 BOLOGNA,ITALY. PRINCETON UNIV,DEPT PHYS,PRINCETON,NJ 08544. CSIRO,AUSTRALIA TELESCOPE NATL FACIL,EPPING,NSW 2121,AUSTRALIA. RP ULMER, MP (reprint author), NORTHWESTERN UNIV,DEPT PHYS & ASTRON,EVANSTON,IL 60208, USA. RI D'Amico, Nichi/A-5715-2009; Johnson, Neil/G-3309-2014 NR 24 TC 54 Z9 54 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 NOV 10 PY 1993 VL 417 IS 2 BP 738 EP 741 DI 10.1086/173353 PN 1 PG 4 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA MD971 UT WOS:A1993MD97100034 ER PT J AU GLASER, ER KENNEDY, TA CROOKHAM, HC FREITAS, JA KHAN, MA OLSON, DT KUZNIA, JN AF GLASER, ER KENNEDY, TA CROOKHAM, HC FREITAS, JA KHAN, MA OLSON, DT KUZNIA, JN TI OBSERVATION OF OPTICALLY DETECTED MAGNETIC-RESONANCE IN GAN FILMS SO APPLIED PHYSICS LETTERS LA English DT Article ID VACANCY DEFECT; IDENTIFICATION AB Optically detected magnetic resonance has been observed from GaN. Two magnetic resonances have been detected on the 2.2 eV-deep photoluminescence band. The first resonance is sharp [full width at half-maximum (FWHM) approximately 2.2 mT] with g(parallel-to) = 1.9515 +/- 0.0002 and g(perpendicular-to) = 1.9485 +/- 0.0002 and is assigned to conduction electrons, in agreement with recent electron paramagnetic resonance (EPR) studies of similar samples. The second feature, which has not been seen by EPR, is much broader (FWHM approximately 13 mT) with g(parallel-to) = 1.989 +/- 0.001 and g(perpendicular-to) = 1.992 +/- 0.001. These parameters indicate a deep state. A tentative assignment is made to a deep state associated with the N vacancy. C1 SACHS FREEMAN ASSOCIATES INC,LANDOVER,MD 20785. APA OPT INC,BLAINE,MN 55434. RP GLASER, ER (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 16 TC 41 Z9 41 U1 1 U2 2 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0003-6951 J9 APPL PHYS LETT JI Appl. Phys. Lett. PD NOV 8 PY 1993 VL 63 IS 19 BP 2673 EP 2675 DI 10.1063/1.110416 PG 3 WC Physics, Applied SC Physics GA MF860 UT WOS:A1993MF86000029 ER PT J AU ROLAND, CM SANTANGELO, PG NGAI, KL MEIER, G AF ROLAND, CM SANTANGELO, PG NGAI, KL MEIER, G TI RELAXATION DYNAMICS IN POLY(METHYLPHENYLSILOXANE), 1,1-BIS(P-METHOXYPHENYL)CYCLOHEXANE, AND THEIR MIXTURES SO MACROMOLECULES LA English DT Article ID MISCIBLE POLYMER BLENDS; SEGMENTAL RELAXATION; DIELECTRIC-RELAXATION; AMORPHOUS POLYMERS; SOLVENT DYNAMICS; LIGHT-SCATTERING; LIQUIDS; TIME; POLYISOPRENE; COMPATIBILITY AB Mixtures of the small-molecule glass former 1,1-bis(p-methoxyphenyl)cyclohexane (BMC) with poly(methylphenylsiloxane) (PMPS) are especially interesting because the glass transition temperatures of the components are nearly equal.1 Moreover, these T(g) differences can be systematically varied by varying the molecular weight of the polymer. Dynamic mechanical measurements of the glass transition dispersion have been carried out on the neat liquids and their mixtures. The former exhibit normal segmental relaxation behavior, including a correlation of time and temperature dependences. While the behavior of the polymer-rich mixtures is unexceptional, the BMC dynamics are modified in a very interesting way by the presence of the polymer. In particular, the introduction of a small quantity of higher T(g) PMPS is found to reduce the reorientational relaxation time of the BMC; that is, the relaxation speeds up. A similar anomaly has been observed in polychlorinated biphenyl containing a few percent of poly(vinylethylene).2,3 This behavior is at odds with a simple free volume approach to relaxation in the vicinity of T(g); in fact, the excess volume is negative for BMC mixed with 10% PMPS. An interpretation for these results based on the coupling model of relaxation is suggested. C1 FORSCHUNGSZENTRUM JULICH, FORSCHUNGSZENTRUM, W-5170 JULICH 1, GERMANY. RP ROLAND, CM (reprint author), USN, RES LAB, WASHINGTON, DC 20375 USA. NR 45 TC 38 Z9 38 U1 0 U2 3 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0024-9297 J9 MACROMOLECULES JI Macromolecules PD NOV 8 PY 1993 VL 26 IS 23 BP 6164 EP 6170 DI 10.1021/ma00075a004 PG 7 WC Polymer Science SC Polymer Science GA MF859 UT WOS:A1993MF85900004 ER PT J AU SASTRI, SB KELLER, TM JONES, KM ARMISTEAD, JP AF SASTRI, SB KELLER, TM JONES, KM ARMISTEAD, JP TI STUDIES ON CURE CHEMISTRY OF NEW ACETYLENIC RESINS SO MACROMOLECULES LA English DT Article AB This paper describes cure studies of arylacetylene-terminated resins to gain some fundamental understanding of the influence of various structural aspects of a molecule on its cure chemistry. Of particular interest are the effects of the number of acetylenic substituents on the aromatic ring and their relative positions to one another. Activation energy (E) of the cure reaction as calculated from dynamic DSC analysis reveals that there is a direct correlation between the activation energy and the stability of radicals formed by thermal initiation. Based on model compound studies, it is evident that the resonance stabilization of radicals contributes significantly to the lowering of activation energy values. When the number of substituents on the aromatic ring varies, the combined influence of resonance, inductive, proximity, and steric factors needs to be considered. Studies with blends of acetylenic monomers suggest that the possible chain-initiating species are those radicals which can be stabilized by resonance. From the DSC data, we also infer that the radicals formed initially may not be very selective in the reaction with other multiple bonds in their vicinity. C1 USN,RES LAB,MAT CHEM BRANCH,WASHINGTON,DC 20375. NR 25 TC 61 Z9 65 U1 4 U2 7 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0024-9297 J9 MACROMOLECULES JI Macromolecules PD NOV 8 PY 1993 VL 26 IS 23 BP 6171 EP 6174 DI 10.1021/ma00075a005 PG 4 WC Polymer Science SC Polymer Science GA MF859 UT WOS:A1993MF85900005 ER PT J AU WERNER, BT GILLESPIE, DT AF WERNER, BT GILLESPIE, DT TI FUNDAMENTALLY DISCRETE STOCHASTIC-MODEL FOR WIND RIPPLE DYNAMICS SO PHYSICAL REVIEW LETTERS LA English DT Article AB We present a discrete, stochastic model for wind formed ripples in sand, which are observed to increase in size through mergers and seemingly approach an asymptotic spatial scale. The model is shown to predict (1) a logarithmic increase in pattern scale with time, (2) a proportionality between the microscopic discrete scale (sand grain diameter) and the macroscopic pattern scale (ripple height), and (3) a lack of scale separation. The implications are that growth and apparent stabilization of scale both can be explained by a single mechanism, and that the evolution of wind ripples and other physical systems of this type cannot be modeled by either deterministic methods or spatial continuum methods. C1 USN,CTR AIR WARFARE,RES DEPT,CHINA LAKE,CA 93555. RP WERNER, BT (reprint author), UNIV CALIF SAN DIEGO,SCRIPPS INST OCEANOG,CTR COASTAL STUDIES,LA JOLLA,CA 92093, USA. NR 16 TC 43 Z9 45 U1 0 U2 8 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 NOV 8 PY 1993 VL 71 IS 19 BP 3230 EP 3233 DI 10.1103/PhysRevLett.71.3230 PG 4 WC Physics, Multidisciplinary SC Physics GA MF914 UT WOS:A1993MF91400048 ER PT J AU UHM, HS AF UHM, HS TI RESISTIVE-WALL KLYSTRON SO PHYSICS LETTERS A LA English DT Article ID RELATIVISTIC ELECTRON-BEAMS AB A novel high-power high-frequency klystron is presented in which a relativistic electron beam is modulated at the first cavity and propagates downstream through a resistive wall. Because of the self-excitation of the space charge waves by the resistive-wall instability, a highly nonlinear current modulation is accomplished. Due to the relatively large growth rate of the instability, the required tube length of the klystron is short for most applications. RP UHM, HS (reprint author), USN,CTR SURFACE WARFARE,10901 NEW HAMPSHIRE AVE,SILVER SPRING,MD 20903, USA. NR 10 TC 0 Z9 0 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0375-9601 J9 PHYS LETT A JI Phys. Lett. A PD NOV 8 PY 1993 VL 182 IS 1 BP 120 EP 124 DI 10.1016/0375-9601(93)90064-7 PG 5 WC Physics, Multidisciplinary SC Physics GA MG805 UT WOS:A1993MG80500021 ER PT J AU ARTHUR, RR ELSHARKAWY, MS COPE, SE BOTROS, BA OUN, S MORRILL, JC SHOPE, RE HIBBS, RG DARWISH, MA IMAM, IZE AF ARTHUR, RR ELSHARKAWY, MS COPE, SE BOTROS, BA OUN, S MORRILL, JC SHOPE, RE HIBBS, RG DARWISH, MA IMAM, IZE TI RECURRENCE OF RIFT-VALLEY FEVER IN EGYPT SO LANCET LA English DT Note AB Rift Valley fever (RVF) has been recorded in man and in domestic animals in Egypt after a 12-year absence. Human infections were first noted in the Aswan Governorate in late May, 1993. Only cases of ocular disease, an infrequent and late manifestation, were reported. Of 41 cases, 35 were tested serologically and 27 (77%) had RVF virus-specific IgM antibodies. An estimated 600-1500 infections occurred in the region. Abortions in cattle and buffalo were seen concurrently and antibodies to RVFV were present in 39% of domestic livestock, presumably unvaccinated. RVFV was isolated from an aborted water buffalo fetus. C1 JOHNS HOPKINS UNIV,SCH HYG & PUBL HLTH,DEPT IMMUNOL & INFECT DIS,BALTIMORE,MD 21218. MINIST HLTH CAIRO,CAIRO,EGYPT. USA,INFECT DIS RES INST,FT DETRICK,MD. YALE UNIV,YALE ARBOVIRUS RES UNIT,NEW HAVEN,CT 06520. AIN SHAMS UNIV,FAC MED,CAIRO,EGYPT. RP ARTHUR, RR (reprint author), USN,MED RES UNIT 3,CODE 307,PSC 452,BOX 5000,FPO AE 09835 000,CAIRO,EGYPT. FU NIAID NIH HHS [AI 10984] NR 4 TC 63 Z9 65 U1 0 U2 3 PU LANCET LTD PI LONDON PA 42 BEDFORD SQUARE, LONDON, ENGLAND WC1B 3SL SN 0140-6736 J9 LANCET JI Lancet PD NOV 6 PY 1993 VL 342 IS 8880 BP 1149 EP 1150 DI 10.1016/0140-6736(93)92128-G PG 2 WC Medicine, General & Internal SC General & Internal Medicine GA MF198 UT WOS:A1993MF19800014 PM 7901480 ER PT J AU CHEN, J GARREN, DA AF CHEN, J GARREN, DA TI INTERPLANETARY MAGNETIC CLOUDS - TOPOLOGY AND DRIVING MECHANISM SO GEOPHYSICAL RESEARCH LETTERS LA English DT Article ID 1 AU; LOOPS; 1-AU AB A model is developed to study the origin and propagation of magnetic clouds. Starting with an equilibrium current loop embedded in an ambient plasma consistent with the solar corona, magnetic energy is injected by increasing the loop current. This causes the loop to rise, propelling plasma and magnetic field away from the Sun. Using a simple model of the interplanetary medium, the subsequent dynamics of the loop is calculated to 1 AU and beyond. The macroscopic properties of the resulting structures at 1 AU closely resemble those of observed magnetic clouds. Thermal effects indicate that clouds remain magnetically connected to the Sun in order to yield observed temperatures near 1 AU. RP CHEN, J (reprint author), USN,RES LAB,DIV PLASMA PHYS,BEAM PHYS BRANCH,CODE 4790,WASHINGTON,DC 20375, USA. NR 22 TC 78 Z9 81 U1 0 U2 0 PU AMER GEOPHYSICAL UNION PI WASHINGTON PA 2000 FLORIDA AVE NW, WASHINGTON, DC 20009 SN 0094-8276 J9 GEOPHYS RES LETT JI Geophys. Res. Lett. PD NOV 5 PY 1993 VL 20 IS 21 BP 2319 EP 2322 DI 10.1029/93GL02426 PG 4 WC Geosciences, Multidisciplinary SC Geology GA MF829 UT WOS:A1993MF82900001 ER PT J AU FLETCHER, MC SAMELSON, LE JUNE, CH AF FLETCHER, MC SAMELSON, LE JUNE, CH TI COMPLEX EFFECTS OF PHENYLARSINE OXIDE IN T-CELLS - INDUCTION OF TYROSINE PHOSPHORYLATION AND CALCIUM MOBILIZATION INDEPENDENT OF CD45 EXPRESSION SO JOURNAL OF BIOLOGICAL CHEMISTRY LA English DT Article ID PHOSPHATIDYL-INOSITOL PATHWAY; ANTIGEN RECEPTOR; PHOSPHOLIPASE C-GAMMA-1; SIGNAL TRANSDUCTION; HIGH-AFFINITY; TUBULE CELLS; ACTIVATION; KINASE; STIMULATION; PHOSPHOTYROSINE AB The effects of phenylarsine oxide, a phosphotyrosine phosphatase inhibitor, on early signal transduction events in human T cells were studied. Simultaneous stimulation of T cells with anti-CD3 monoclonal antibody and phenylarsine oxide prevented increased tyrosine phosphorylation of phospholipase Cgamma1. In contrast, treatment of resting T cells with phenylarsine oxide alone resulted in increased tyrosine phosphorylation of a number of other intracellular substrates. Further, phenylarsine oxide was able to cause an immediate disruption of signal transduction in T cells after anti-CD3 stimulation, as measured by a return of intracellular calcium concentration and inositol 1,4,5-trisphosphate production to base-line levels. Surprisingly, in view of the inhibitory effects of phenylarsine oxide on T cell receptor signal transduction, treatment of T cells with phenylarsine oxide alone caused a dose-dependent increase in intracellular-free calcium concentration that was not accompanied with detectable increases in inositol 1,4,5-trisphosphate production. The phenylarsine oxide-induced increase in free calcium had distinct kinetics from antigen receptor-activated calcium mobilization and was derived from both intracellular sources and increased plasma membrane calcium permeability. This effect was independent of the CD45 transmembrane tyrosine phosphatase. Phenylarsine oxide thus has complex effects on signal transduction in T cells that suggests multiple intracellular targets, and these should be considered in the interpretation of experiments using this agent to study cellular kinase and phosphatase interactions. Finally, the effects of phenylarsine oxide on cellular calcium homeostasis may provide a mechanism of action for the therapeutic and/or toxic effects of arsenicals used for various forms of chemotherapy. C1 USN,MED RES INST,IMMUNE CELL BIOL PROGRAM,BETHESDA,MD 20889. NIH,CELL BIOL & METAB BRANCH,BETHESDA,MD 20892. NR 46 TC 46 Z9 46 U1 0 U2 1 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 NOV 5 PY 1993 VL 268 IS 31 BP 23697 EP 23703 PG 7 WC Biochemistry & Molecular Biology SC Biochemistry & Molecular Biology GA MF515 UT WOS:A1993MF51500110 PM 7693695 ER PT J AU EATON, PE XIONG, YS GILARDI, R AF EATON, PE XIONG, YS GILARDI, R TI SYSTEMATIC SUBSTITUTION ON THE CUBANE NUCLEUS - SYNTHESIS AND PROPERTIES OF 1,3,5-TRINITROCUBANE AND 1,3,5,7-TETRANITROCUBANE SO JOURNAL OF THE AMERICAN CHEMICAL SOCIETY LA English DT Article ID ORTHO-MAGNESIATION; AMIDE ACTIVATION; CHEMISTRY; DIMETHYLDIOXIRANE; PHENYLCUBANES; DERIVATIVES; DIOXIRANES; NITRO AB A systematic methodology is developed for the synthesis of highly symmetric, polysubstituted cubanes. The synthesis of cubanes with C3v and T(d) symmetry is achieved. Details are given for the preparation of 1,3,5-trinitrocubane and 1,3,5,7-tetranitrocubane, compounds of interest as superior high-energy, shock-insensitive explosives. The structures of these new materials, determined by single-crystal X-ray analysis, are discussed in detail. DSC analysis of their thermal decomposition is presented. The effect of nitro groups on the C-13-NMR spectra of cubanes is noted. C1 USN,RES LAB,STRUCT MATTER LAB,WASHINGTON,DC 20375. RP EATON, PE (reprint author), UNIV CHICAGO,DEPT CHEM,5735 S ELLIS AVE,CHICAGO,IL 60637, USA. NR 34 TC 73 Z9 75 U1 2 U2 12 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 NOV 3 PY 1993 VL 115 IS 22 BP 10195 EP 10202 DI 10.1021/ja00075a039 PG 8 WC Chemistry, Multidisciplinary SC Chemistry GA MF517 UT WOS:A1993MF51700039 ER PT J AU CRAMER, CJ FAMINI, GR LOWREY, AH AF CRAMER, CJ FAMINI, GR LOWREY, AH TI USE OF CALCULATED QUANTUM-CHEMICAL PROPERTIES AS SURROGATES FOR SOLVATOCHROMIC PARAMETERS IN STRUCTURE-ACTIVITY-RELATIONSHIPS SO ACCOUNTS OF CHEMICAL RESEARCH LA English DT Review ID QUANTITATIVE STRUCTURE-ACTIVITY; SOLVATION ENERGY RELATIONSHIPS; LOCAL EMPIRICAL RULES; WATER PARTITION-COEFFICIENTS; SALMONELLA-TYPHIMURIUM TA100; THEORETICAL DESCRIPTORS; FUNDAMENTAL LAWS; PI-STAR; PHYSICOCHEMICAL PROPERTIES; SOLUBILITY PROPERTIES C1 UNIV MINNESOTA,INST SUPERCOMP,MINNEAPOLIS,MN 55455. USA,EDGEWOOD RES DEV & ENGN CTR,SCBRD,RT,ABERDEEN PROVING GROUND,MD 21010. USN,RES LAB,STRUCT & MATTER LAB,WASHINGTON,DC 20375. RP CRAMER, CJ (reprint author), UNIV MINNESOTA,DEPT CHEM,207 PLEASANT ST SE,MINNEAPOLIS,MN 55455, USA. RI Cramer, Christopher/B-6179-2011 OI Cramer, Christopher/0000-0001-5048-1859 NR 116 TC 72 Z9 73 U1 1 U2 7 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 NOV PY 1993 VL 26 IS 11 BP 599 EP 605 DI 10.1021/ar00035a006 PG 7 WC Chemistry, Multidisciplinary SC Chemistry GA MH608 UT WOS:A1993MH60800006 ER PT J AU EUBANKS, TM AF EUBANKS, TM TI INTERACTIONS BETWEEN THE ATMOSPHERE, OCEANS AND CRUST - POSSIBLE OCEANIC SIGNALS IN EARTH ROTATION SO ADVANCES IN SPACE RESEARCH LA English DT Article ID ANGULAR-MOMENTUM FLUCTUATIONS; MADDEN-JULIAN OSCILLATION; OF-DAY VARIATION; EL-NINO; TROPICAL PACIFIC; SOUTHERN OSCILLATION; ROSSBY WAVES; SOLID EARTH; WIND STRESS; LENGTH AB Observations of changes in the orientation of the Earth (UT1 and polar motion) provide a novel means of studying the dynamics of the atmosphere and oceans as variations in the angular momentum of the oceans and atmosphere must be balanced by changes in the rotation of the ''solid'' Earth (the crust and mantle). Estimates of the total angular momentum of the atmosphere are routinely available as a by-product of medium range weather forecasting, and these data have greatly facilitated the study of the terrestrial angular momentum balance. Although the role of the oceans in non-tidal rotational fluctuations remains obscure due to a lack of suitable oceanic data, oceanic angular momentum exchanges may well be visible in current Earth rotation data. This paper presents a simple dynamical model of barotropic and baroclinic ocean waves to illustrate possible oceanic excitations of rotational variations. Sea floor bottom pressure measurements strongly suggest that bottom pressure changes are the cause of currently unexplained polar motions at short periods (weeks to months), and it is shown that these are probably dominated by barotropic oscillations forced by surface wind stresses. At longer periods, baroclinic ocean waves are part of the El Nino Southern Oscillation phenomena, and it is shown that these may cause observable interannual variations in rotation rate. By contrast, the close correlation found between rotation rate and atmospheric zonal winds indicates that the high frequency variations in the axial wind stress torque on the oceans must be rapidly transmitted to the solid Earth. Recent work indicates that this is done by the rapid zonal propagation of barotropic ocean waves to the continental margins of the ocean basins, which may provide a detectable geodetic signal. RP EUBANKS, TM (reprint author), USN OBSERV,CODE TSEO,WASHINGTON,DC 20392, USA. OI Eubanks, Thomas Marshall/0000-0001-9543-0414 NR 48 TC 5 Z9 6 U1 0 U2 2 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0273-1177 J9 ADV SPACE RES JI Adv. Space Res. PD NOV PY 1993 VL 13 IS 11 BP 291 EP 300 DI 10.1016/0273-1177(93)90231-Y PG 10 WC Astronomy & Astrophysics; Geosciences, Multidisciplinary; Meteorology & Atmospheric Sciences SC Astronomy & Astrophysics; Geology; Meteorology & Atmospheric Sciences GA ML875 UT WOS:A1993ML87500037 ER PT J AU HANDLER, RA SWEAN, TF LEIGHTON, RI SWEARINGEN, JD AF HANDLER, RA SWEAN, TF LEIGHTON, RI SWEARINGEN, JD TI LENGTH SCALES AND THE ENERGY-BALANCE FOR TURBULENCE NEAR A FREE-SURFACE SO AIAA JOURNAL LA English DT Article ID OPEN-CHANNEL FLOW; LOW-REYNOLDS-NUMBER; BOUNDARY-LAYER; STRESS; WALL AB The structure of turbulence near a free surface is examined by using results obtained from a direct simulation of flow between a no-slip wall and a shear free boundary, which serves as a model of a waveless free surface. An energy balance analysis shows that the pressure-strain term is the dominant producing term for the spanwise component of the turbulent kinetic energy. In addition, the dissipation rates for the horizontal components of the turbulence are reduced near the free surface, whereas the dissipation mte for the vertical component remains approximately constant. Two-point correlations, energy spectra, and length scales reveal important free surface induced effects. The length scales near the free surface are compared with the scales near the centerline of normal turbulent channel flow. This comparison reveals an increase by a factor of three in the streamwise length scales associated with the spanwise velocity fluctuations and an increase by a factor of two in the spanwise length scales for the streamwise velocity fluctuations. The length scales normal to the free surface are decreased for all velocity components. This indicates a more pancake-like eddy structure near the free surface compared with the structure near the centerline of a normal channel. The energy spectra show qualitative agreement with the Hunt-Graham model, though higher resolution calculations will be required to make more quantitative comparisons. The streaky structure in free surface bounded turbulent channel flow is noticeably more persistent than in normal turbulent channel flow. This is principally due to the attachment of streamwise oriented wall eddies to the free surface. C1 UNIV KANSAS,DEPT MECH ENGN,LAWRENCE,KS 66045. RP HANDLER, RA (reprint author), USN,RES LAB,DIV REMOTE SENSING,WASHINGTON,DC 20375, USA. NR 26 TC 77 Z9 77 U1 2 U2 7 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 NOV PY 1993 VL 31 IS 11 BP 1998 EP 2007 DI 10.2514/3.11883 PG 10 WC Engineering, Aerospace SC Engineering GA MF793 UT WOS:A1993MF79300005 ER PT J AU BAIRD, RE CULLOM, S DEEDMAN, R FEENEY, J KELLOGG, J SIMNING, P AF BAIRD, RE CULLOM, S DEEDMAN, R FEENEY, J KELLOGG, J SIMNING, P TI OSTEOPATHIC MANIPULATION AND TENSION-TYPE HEADACHES SO AMERICAN FAMILY PHYSICIAN LA English DT Letter RP BAIRD, RE (reprint author), USN,HOSP CHERRY POINT,DEPT FAMILY PRACTICE,CHERRY POINT,NC, USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER ACAD FAMILY PHYSICIANS PI KANSAS CITY PA 8880 WARD PARKWAY, KANSAS CITY, MO 64114-2797 SN 0002-838X J9 AM FAM PHYSICIAN JI Am. Fam. Physician PD NOV 1 PY 1993 VL 48 IS 6 BP 1023 EP 1024 PG 2 WC Primary Health Care; Medicine, General & Internal SC General & Internal Medicine GA MF796 UT WOS:A1993MF79600004 PM 8305041 ER PT J AU RECTOR, JT GRAY, CL SHARPE, RW HALL, FW THOMAS, W JONES, W AF RECTOR, JT GRAY, CL SHARPE, RW HALL, FW THOMAS, W JONES, W TI ACUTE LYMPHOID LEUKEMIA ASSOCIATED WITH MAFFUCCI SYNDROME SO AMERICAN JOURNAL OF PEDIATRIC HEMATOLOGY ONCOLOGY LA English DT Article DE LEUKEMIA; MAFFUCCI SYNDROME; MESODERMAL DYSPLASIA; MALIGNANT MESODERMAL AND NONMESODERMAL NEOPLASIAS; SECONDARY LEUKEMIA ID PATIENT AB Purpose: Maffucci's syndrome is a nonhereditary congenital disorder associated with multiple enchondromas, soft tissue hemangiomas, or lymphangiomas. It carries an associated high risk of the development of malignant neoplasms, particularly sarcomatous transformation of an enchondroma, as well as other malignant mesodermal and nonmesodermal neoplasms. Hematopoietic malignancies arising in Maffucci's syndrome are exceedingly rare. We report the case of a 14-year-old girl with Maffucci's syndrome who developed acute lymphoid leukemia. Patients and Methods: The patient presented at 18 months of age with enchondromatosis. Maffucci's syndrome was established at 10 years of age after the appearance of multiple hemangiomas. Results: At 14 years of age the patient developed fatigue, frequent nosebleeds, easy bruising, and weight loss, with circulating blasts in the peripheral blood. Bone marrow examination showed replacement of marrow spaces with leukemic blasts. Immunohistochemical and flow cytometric findings were consistent with a diagnosis of acute lymphoblastic leukemia with myeloid antigen expression. Conclusions: The occurrence of acute leukemia in a patient with Maffucci's syndrome may represent predisposition to yet another malignancy and reflect further expression of a generalized mesodermal dysplasia in these patients. It also emphasizes the need for aggressive surveillance in patients with Maffucci's syndrome. C1 USN HOSP,DEPT LAB MED,SAN DIEGO,CA 92134. NORTHWESTERN UNIV,SCH MED,CHICAGO,IL 60611. USN HOSP,DEPT PEDIAT,SAN DIEGO,CA 92134. RP RECTOR, JT (reprint author), USN HOSP,DEPT CLIN INVEST,SAN DIEGO,CA 92134, USA. NR 19 TC 11 Z9 11 U1 0 U2 0 PU LIPPINCOTT-RAVEN PUBL PI PHILADELPHIA PA 227 EAST WASHINGTON SQ, PHILADELPHIA, PA 19106 SN 0192-8562 J9 AM J PEDIAT HEMATOL PD NOV PY 1993 VL 15 IS 4 BP 427 EP 429 PG 3 WC Oncology; Hematology; Pediatrics SC Oncology; Hematology; Pediatrics GA ME683 UT WOS:A1993ME68300013 PM 8214367 ER PT J AU PITMAN, KT DIAZORDAZ, EA PARKER, GS AF PITMAN, KT DIAZORDAZ, EA PARKER, GS TI A TRANSSPHENOIDAL APPROACH TO PETROUS APEX LESIONS USING ENDOSCOPIC SINUS SCOPES SO AMERICAN JOURNAL OF RHINOLOGY LA English DT Article ID SKULL BASE; SURGERY AB The authors describe biopsy of a petrous apex lesion via a transnasal, transsphenoidal endoscopic approach. Various surgical approaches to the petrous apex are discussed as well as our experience using the endoscopic approach. We propose that this approach can be refined for future use as a method for biopsy and permanent fistulization of cystic petrous apex lesions that encroach on the sphenoid sinus. RP PITMAN, KT (reprint author), USN HOSP,DEPT OTOLARYNGOL HEAD & NECK SURG,PORTSMOUTH,VA 23708, USA. NR 10 TC 0 Z9 0 U1 0 U2 0 PU OCEAN SIDE PUBLICATIONS INC PI PROVIDENCE PA 95 PITMAN ST, PROVIDENCE, RI 02906 SN 1050-6586 J9 AM J RHINOL JI Am. J. Rhinol. PD NOV-DEC PY 1993 VL 7 IS 6 BP 257 EP 260 DI 10.2500/105065893781976230 PG 4 WC Otorhinolaryngology SC Otorhinolaryngology GA MQ905 UT WOS:A1993MQ90500002 ER PT J AU TIMONEY, JM INMAN, WS QUESADA, PM SHARKEY, PF BARRACK, RL SKINNER, HB ALEXANDER, AH AF TIMONEY, JM INMAN, WS QUESADA, PM SHARKEY, PF BARRACK, RL SKINNER, HB ALEXANDER, AH TI RETURN OF NORMAL GAIT PATTERNS AFTER ANTERIOR CRUCIATE LIGAMENT RECONSTRUCTION SO AMERICAN JOURNAL OF SPORTS MEDICINE LA English DT Article AB Individuals with anterior cruciate ligament deficiency typically do not have quadriceps activity during stance. This aberrant pattern has been termed ''quadriceps avoidance'' gait. We performed gait analysis during walking on 10 normal controls and 10 subjects 8 to 12 months after they had anterior cruciate ligament reconstruction using autogenous middle third of the patellar tendon. All patients had good subjective and objective results at the time of analysis. Differences in gait between subjects and controls persisted up to 12 months after surgery. Specifically, subjects with anterior cruciate ligament reconstructions demonstrated significant reductions in midstance knee flexion moments (P < 0.01) and tibially directed loading rates (P < 0.05) when compared with controls. However, the subjects had a net external flexion moment throughout most of the stance phase.of gait, implying that quadriceps activity was present. After anterior cruciate ligament reconstruction, there is a tendency toward gait normalization, and a quadriceps avoidance mechanism is no longer present. C1 NAVAL HOSP,DEPT ORTHOPAED SURG,OAKLAND,CA 94627. NR 0 TC 80 Z9 85 U1 0 U2 7 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 NOV-DEC PY 1993 VL 21 IS 6 BP 887 EP 889 DI 10.1177/036354659302100623 PG 3 WC Orthopedics; Sport Sciences SC Orthopedics; Sport Sciences GA MG681 UT WOS:A1993MG68100023 PM 8291645 ER PT J AU FRYAUFF, DJ MODI, GB MANSOUR, NS KREUTZER, RD SOLIMAN, S YOUSSEF, FG AF FRYAUFF, DJ MODI, GB MANSOUR, NS KREUTZER, RD SOLIMAN, S YOUSSEF, FG TI EPIDEMIOLOGY OF CUTANEOUS LEISHMANIASIS AT A FOCUS MONITORED BY THE MULTINATIONAL FORCE AND OBSERVERS IN THE NORTHEASTERN SINAI DESERT OF EGYPT SO AMERICAN JOURNAL OF TROPICAL MEDICINE AND HYGIENE LA English DT Article ID PHLEBOTOMUS-PAPATASI; NORTH SINAI; VECTORS AB A longitudinal epidemiologic study of cutaneous leishmaniasis (CL) transmission was conducted between July 1989 and June 1991 in a 1,200-km2 sector of the northeastern Sinai Desert monitored by the Multinational Force and Observers (MFO), an international peace keeping mission between Egypt and Israel. The occurrence of human cases, sand fly density, rodent collection, and isolations of Leishmania confirmed only one of four surveyed locations as a significant focus of CL transmission. Phlebotomus papatasi, the only anthropophilic sand fly species encountered at this focus, comprised more than 96% of the sand fly population and attained human landing densities exceeding 100 sand flies/person/hr during 1990. Seasonal activity of this species ranged from April to November, with highest densities occurring during the period May-September. A peak promastigote infection rate of 2.4% (13 of 534) was observed in P. papatasi during July 1990. Twelve of the 60 (20%) persons at risk during the six months of intense sand fly activity at this site developed lesions consistent with CL; L. major was isolated from nine (75%) of these cases. Leishmania major infection was acquired by two of 22 (9%) sentinel hamsters used during the same period. More than 97% of the 897 wild rodents trapped at this site were desert gerbil species. Leishmania major was the only Leishmania isolated from human, sand fly, wild rodent (Gerbillus pyramidum), and sentinel hamster infections that originated at site Check point 1-Delta, the focus of CL transmission within jurisdiction of the MFO. The altered ecology of this area, created by construction of a dam, may contribute significantly to the transmission dynamics of CL at this focus. C1 YOUNGSTOWN STATE UNIV,DEPT BIOL,YOUNGSTOWN,OH 44555. AIN SHAMS UNIV,FAC SCI,DEPT ZOOL,CAIRO 11566,EGYPT. RP FRYAUFF, DJ (reprint author), USN,MED RES UNIT 3,DEPT RES SCI,CODE 301B,PSC 452,BOX 5000,FPO,AE 09835-0007,CAIRO,EGYPT. NR 28 TC 26 Z9 30 U1 1 U2 1 PU AMER SOC TROP MED & HYGIENE PI MCLEAN PA 8000 WESTPARK DRIVE SUITE 130, MCLEAN, VA 22101 SN 0002-9637 J9 AM J TROP MED HYG JI Am. J. Trop. Med. Hyg. PD NOV PY 1993 VL 49 IS 5 BP 598 EP 607 PG 10 WC Public, Environmental & Occupational Health; Tropical Medicine SC Public, Environmental & Occupational Health; Tropical Medicine GA MK141 UT WOS:A1993MK14100009 PM 8250099 ER PT J AU SEELY, JF BROWN, CM AF SEELY, JF BROWN, CM TI MULTILAYER-COATED GRATING SPECTROMETER OPERATING IN THE EXTREME-ULTRAVIOLET REGION AND BASED ON THE SEYA-NAMIOKA MOUNT SO APPLIED OPTICS LA English DT Article DE DIFFRACTION GRATING; MULTILAYER COATING; SEYA-NAMIOKA MOUNT; EXTREME UV AB The performance of a spectrometer that uses a blazed multilayer-coated grating and that is based on the Seya-Namioka mount is analyzed. In the extreme-UV wavelength region, the efficiency of the grating is relatively high in a narrow bandpass that is defined by the reflectance of the multilayer coating. The bandpass can be shifted in wavelength by rotation of the grating, as is the case for the Seya-Namioka mount, for which the angle of incidence on the grating is near 35-degrees. It is shown that when the source is slightly off the Rowland circle, as occurs when the grating is rotated and the source-to-grating distance is fixed, one can maintain good focusing can be maintained by moving the detector over a small range of distance and angle. The multilayer coating can be designed so that the grating remains on-blaze in wavelength regions of interest and in particular orders as the grating is rotated. A spectrometer composed of a multilayer grating and a movable detector can have relatively high throughput and resolving power in the extreme-UV region. When the grating is rotated, the wavelength coverage is wider than is the case for incidence angles near normal. RP SEELY, JF (reprint author), USN, RES LAB, EO HULBURT CTR SPACE RES, WASHINGTON, DC 20375 USA. NR 10 TC 7 Z9 7 U1 0 U2 1 PU OPTICAL SOC AMER PI WASHINGTON PA 2010 MASSACHUSETTS AVE NW, WASHINGTON, DC 20036 USA SN 0003-6935 J9 APPL OPTICS JI Appl. Optics PD NOV 1 PY 1993 VL 32 IS 31 BP 6288 EP 6293 PG 6 WC Optics SC Optics GA MF623 UT WOS:A1993MF62300014 PM 20856464 ER PT J AU SEELY, JF HOLLAND, GE GIASSON, JV AF SEELY, JF HOLLAND, GE GIASSON, JV TI HIGH-RESOLUTION IMAGING OF LASER-PRODUCED PLASMAS AT A WAVELENGTH OF 130-ANGSTROM BY A NORMAL-INCIDENCE MULTILAYER-MIRROR MICROSCOPE SO APPLIED OPTICS LA English DT Article DE MULTILAYER-COATED MIRRORS; LASER-PRODUCED PLASMAS; EXTREME UV ID RAY AB Laser-produced plasmas were imaged by a microscope consisting of spherical, primary, and secondary mirrors in a Cassegrain-type optical configuration. The mirrors were coated with 40 periods of Mo and Si and had a peak reflectance of approximately 60% at a wavelength of 130 angstrom. Nb, Au, and Al targets were irradiated by as many as 24 beams of the Omega laser at the Laboratory for Laser Energetics at the University of Rochester. The images were recorded on Kodak 101 film, and the resolution was limited by the 10-mum emulsion grain size. Two different secondary mirrors produced images with a magnification of 0.8 or 2.2, and a variety of plasma emission features were recorded with 5-mum (0.6-arcsec) resolution in the target plane. The possibility of operating a similar microscope in the wavelength region of 34-50 angstrom is discussed. C1 SFA US INC, LANDOVER, MD 20785 USA. THOMAS JEFFERSON HIGH SCH SCI & TECHNOL, ALEXANDRIA, VA 22312 USA. RP SEELY, JF (reprint author), USN, RES LAB, EO HULBURT CTR SPACE RES, WASHINGTON, DC 20375 USA. NR 16 TC 10 Z9 14 U1 0 U2 2 PU OPTICAL SOC AMER PI WASHINGTON PA 2010 MASSACHUSETTS AVE NW, WASHINGTON, DC 20036 USA SN 0003-6935 J9 APPL OPTICS JI Appl. Optics PD NOV 1 PY 1993 VL 32 IS 31 BP 6294 EP 6302 PG 9 WC Optics SC Optics GA MF623 UT WOS:A1993MF62300015 PM 20856465 ER PT J AU REEVE, SW WEIMER, WA DANDY, DS AF REEVE, SW WEIMER, WA DANDY, DS TI DIAMOND GROWTH USING REMOTE METHANE INJECTION IN A DIRECT-CURRENT ARCJET CHEMICAL-VAPOR-DEPOSITION REACTOR SO APPLIED PHYSICS LETTERS LA English DT Article ID PLASMA-JET AB A significant enhancement in the quality of diamond films grown using a remote CH4 carbon source was observed in a direct current arcjet chemical vapor deposition reactor. The linewidths of the diamond peak at 1332 cm-1 in the Raman spectra from these films were reduced from 9.0 to 6.5 cm-1 with no reduction in mass deposition rate as compared to films grown using premixed reactor gas feeds. For diamond growth conditions, the percentage of the reactor feed carbon reaching the substrate was measured to be approximately 35 %. The enhanced quality of the films is attributed to reduced residence times of the carbon source in the plasma, which would limit the ps phase chemistry from proceeding beyond CH3 formation before the gas reaches the substrate. C1 COLORADO STATE UNIV, DEPT CHEM ENGN, FT COLLINS, CO 80523 USA. RP REEVE, SW (reprint author), USN, CTR AIR WARFARE, RES DEPT, DIV CHEM, CHINA LAKE, CA 93555 USA. RI Dandy, David/G-6984-2012 OI Dandy, David/0000-0003-3254-0717 NR 13 TC 4 Z9 4 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 0003-6951 J9 APPL PHYS LETT JI Appl. Phys. Lett. PD NOV 1 PY 1993 VL 63 IS 18 BP 2487 EP 2489 DI 10.1063/1.110457 PG 3 WC Physics, Applied SC Physics GA MD960 UT WOS:A1993MD96000012 ER PT J AU MEHLMAN, G CHRISEY, DB HORWITZ, JS BURKHALTER, PG AUYEUNG, RCY NEWMAN, DA AF MEHLMAN, G CHRISEY, DB HORWITZ, JS BURKHALTER, PG AUYEUNG, RCY NEWMAN, DA TI ENHANCEMENT OF THE VACUUM-ULTRAVIOLET EMISSION FROM EXCIMER LASER-GENERATED PLASMAS BY AMBIENT GAS ATOMS SO APPLIED PHYSICS LETTERS LA English DT Article AB We have measured the axial (z) and radial (x) distribution of the vacuum ultraviolet emission from excimer laser generated aluminum plasmas in vacuum and in 300 mTorr of argon. The ratio of the radiated line intensities (emission in a gas versus vacuum) on the z axis (i.e., x = 0) increased exponentially with distance from the target surface for plasmas generated in a 300 mTorr argon ambient. The absolute line intensities increased linearly with the argon pressure and approximately linearly with the ambient gas atomic cross section when other rare gases were substituted. The line intensity radial distribution was broader for plasmas in argon than in vacuum and the magnitude of the effect increased monotonically with z. The spectral data obtained from plasmas in a gas ambient are discussed in terms of the diffusion of plasma electrons in an ionized gas. C1 USN,RES LAB,WASHINGTON,DC 20375. RP MEHLMAN, G (reprint author), SFA INC,1401 MCCORMICK DR,LANDOVER,MD 20785, USA. NR 3 TC 5 Z9 5 U1 0 U2 0 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0003-6951 J9 APPL PHYS LETT JI Appl. Phys. Lett. PD NOV 1 PY 1993 VL 63 IS 18 BP 2490 EP 2492 DI 10.1063/1.110458 PG 3 WC Physics, Applied SC Physics GA MD960 UT WOS:A1993MD96000013 ER PT J AU BREER, WA AF BREER, WA TI ASYMPTOMATIC PAPULE ON THE LOWER LEG - CLEAR-CELL ACANTHOMA SO ARCHIVES OF DERMATOLOGY LA English DT Note RP BREER, WA (reprint author), USN HOSP,SAN DIEGO,CA 92134, USA. NR 9 TC 1 Z9 1 U1 1 U2 1 PU AMER MEDICAL ASSOC PI CHICAGO PA 515 N STATE ST, CHICAGO, IL 60610 SN 0003-987X J9 ARCH DERMATOL JI Arch. Dermatol. PD NOV PY 1993 VL 129 IS 11 BP 1505 EP & PG 0 WC Dermatology SC Dermatology GA MG677 UT WOS:A1993MG67700018 ER PT J AU WALKER, RL AF WALKER, RL TI 3RD LIGHT IN THE SOLUTION OF AN ECLIPSING BINARY LIGHT-CURVE - V505-SAGITTARII SO ASTRONOMICAL JOURNAL LA English DT Article ID PARAMETERS; STARS; ORBIT AB Recent spectroscopic and speckle-interferometric observations made by separate observers have established the existence of a tertiary component in the V505 Sagittarii system. V505 Sgr has been observed and studied many times since its discovery in 1934, but the light of the third component l3 has never been detected in light curve solutions. In the present study the SIMPLEX algorithm [Kallrath & Linnell, ApJ, 313, 346 (1987)] and the Differential Correction (DC) code [Wilson, ApJ, 234, 1054 (1979)] were used to analyze, for the first time, data obtained by Walter [A&AS, 46, 263 (1981)]. The solutions reveal l3 contributing 7 percent light in the V bandwidth, 5 percent in B, and 4 percent in U. These relative intensities correspond to a star with an F8 V spectrum. Tomkin [ApJ, 387, 631 (1992)] obtained F7 V for the third component from his spectroscopic investigation. The photometric mass ratio (q = 0.52) also agrees with Tomkin's study. A comparison between the SIMPLEX and DC solutions is presented. RP WALKER, RL (reprint author), USN OBSERV,FLAGSTAFF STN,POB 1149,FLAGSTAFF,AZ 86002, USA. NR 36 TC 6 Z9 6 U1 0 U2 0 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0004-6256 J9 ASTRON J JI Astron. J. PD NOV PY 1993 VL 106 IS 5 BP 2051 EP 2057 DI 10.1086/116784 PG 7 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA ME684 UT WOS:A1993ME68400026 ER PT J AU CHAMBLISS, CR WALKER, RL KARLE, JH SNODGRASS, HB VRACKO, YA AF CHAMBLISS, CR WALKER, RL KARLE, JH SNODGRASS, HB VRACKO, YA TI A PHOTOMETRIC INVESTIGATION OF THE ECLIPSING BINARY V505-SAGITTARII SO ASTRONOMICAL JOURNAL LA English DT Article ID ICCD SPECKLE OBSERVATIONS; KITT PEAK; STARS; LIGHT; PARAMETERS; CURVES; ORBIT AB V505 Sgr is a classical Algol system consisting of an A2 V primary and a G5 IV secondary that fills its Roche lobe. New times of minimum light are presented. The per-iod of the eclipsing system (1.18287d) varies, due in par-t to an orbital light-time effect. A third component has been detected that orbits the eclipsing pair. This investigation uses the SIMPLEX algorithm [Kallrath & Linnell, ApJ, 313, 346 (1987)] and the Differential Correction code [Wilson, ApJ, 234, 1054 (1979)] to analyze two separate datasets. The results indicate the third component, an F8 V star, contributes about 5% of the light to the system. The minimum projected distance between the third component and the eclipsing pair is 37 AU. This implies an orbital period of about 105 years, a value that differs with the O-C data. The photometric solution, combined with recent spectroscopic data, yields R1 = 2.14R. and R2 = 2.24R. and M1 = 2.20 M. and M2 = 1.15 M.. C1 USN OBSERV,FLAGSTAFF STN,FLAGSTAFF,AZ 86002. LEWIS & CLARK COLL,PORTLAND,OR. RP CHAMBLISS, CR (reprint author), KUTZTOWN STATE UNIV,KUTZTOWN,PA 19530, USA. NR 40 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 0004-6256 J9 ASTRON J JI Astron. J. PD NOV PY 1993 VL 106 IS 5 BP 2058 EP 2071 DI 10.1086/116785 PG 14 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA ME684 UT WOS:A1993ME68400027 ER PT J AU LI, P EMSLIE, AG MARISKA, JT AF LI, P EMSLIE, AG MARISKA, JT TI IMPLICATIONS OF THE SOFT-X-RAY VERSUS HARD X-RAY TEMPORAL RELATIONSHIP IN SOLAR-FLARES SO ASTROPHYSICAL JOURNAL LA English DT Article DE RADIATION MECHANISMS, MISCELLANEOUS; SUN, FLARES; SUN, X-RAYS, GAMMA-RAYS ID CHROMOSPHERIC EVAPORATION; NUMERICAL SIMULATIONS; NONTHERMAL ELECTRONS; MODEL; LOOP; GASDYNAMICS; DIAGNOSTICS; ULTRAVIOLET; SPECTRA; BURSTS AB We have calculated the time profiles of spatially integrated hard X-ray (30-500 keV) and soft X-ray (1-8 angstrom) emission in both thick-target electron-heated models, and bulk heated thermal models, of the impulsive phase of solar flares. For the thermal model, we find a serious difficulty: the time profiles of the 30-500 keV hard X-ray emission do not peak at the same time as those for the higher energy component (40-500 keV) of this emission, a result that manifestly disagrees with the observations. In the.thick-target model, however, the hard X-ray light curves at all energies > 30 keV peak at the same time, lending considerable support to this model. Observations also suggest that the relationship between the hard X-ray and soft X-ray emission is that of ''derivativity,'' that is, the hard X-ray time profile corresponds not so much to the instantaneous soft X-ray flux, but rather its temporal derivative. We have explored the relationship between the hard X-ray (30-500 keV) and soft X-ray (1-8 angstrom) time profiles in the thick-target model. Typically we find that the temporal derivative of the soft X-ray emission does indeed correspond well to the instantaneous soft X-ray emission, particularly during the rise phase of the event. The cause of this behavior is a combination of heating and density enhancement processes, and we assess the relative roles of each process for a variety of simple hard X-ray time profiles, ranging from short (5 s rise time) to long (60 s rise-time). As expected, temperature enhancements dominate the behavior for the shortest bursts, with density enhancements becoming important for bursts of greater than approximately 15 s duration. It also appears that some other form of gradual heating (e.g., slow reconnection) persists through the decay phase of the event. C1 UNIV ALABAMA,DEPT PHYS,HUNTSVILLE,AL 35899. USN,RES LAB,WASHINGTON,DC 20375. RP LI, P (reprint author), UNIV CALIF BERKELEY,SPACE SCI LAB,BERKELEY,CA 94720, USA. NR 42 TC 29 Z9 29 U1 0 U2 0 PU UNIV CHICAGO PRESS PI CHICAGO PA 5720 S WOODLAWN AVE, CHICAGO, IL 60637 SN 0004-637X J9 ASTROPHYS J JI Astrophys. J. PD NOV 1 PY 1993 VL 417 IS 1 BP 313 EP 319 DI 10.1086/173314 PN 1 PG 7 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA MD103 UT WOS:A1993MD10300029 ER PT J AU BHATIA, AK DOSCHEK, GA AF BHATIA, AK DOSCHEK, GA TI ATOMIC DATA AND SPECTRAL-LINE INTENSITIES FOR C-LIKE SI-IX SO ATOMIC DATA AND NUCLEAR DATA TABLES LA English DT Article ID ELECTRON-IMPACT EXCITATION; CROSS-SECTIONS; TRANSITIONS C1 USN,RES LAB,EO HULBURT CTR SPACE RES,WASHINGTON,DC 20375. RP BHATIA, AK (reprint author), NASA,GODDARD SPACE FLIGHT CTR,ASTRON & SOLAR PHYS LAB,GREENBELT,MD 20771, USA. NR 12 TC 27 Z9 27 U1 0 U2 1 PU ACADEMIC PRESS INC JNL-COMP SUBSCRIPTIONS PI SAN DIEGO PA 525 B ST, STE 1900, SAN DIEGO, CA 92101-4495 SN 0092-640X J9 ATOM DATA NUCL DATA JI Atom. Data Nucl. Data Tables PD NOV PY 1993 VL 55 IS 2 BP 281 EP 314 DI 10.1006/adnd.1993.1023 PG 34 WC Physics, Atomic, Molecular & Chemical; Physics, Nuclear SC Physics GA MR225 UT WOS:A1993MR22500003 ER PT J AU BHATIA, AK DOSCHEK, GA AF BHATIA, AK DOSCHEK, GA TI ATOMIC DATA AND SPECTRAL-LINE INTENSITIES FOR C-LIKE NE-V SO ATOMIC DATA AND NUCLEAR DATA TABLES LA English DT Article ID EXCITATION C1 USN,RES LAB,EO HULBURT CTR SPACE RES,WASHINGTON,DC 20375. RP BHATIA, AK (reprint author), NASA,GODDARD SPACE FLIGHT CTR,ASTRON & SOLAR PHYS LAB,GREENBELT,MD 20771, USA. NR 12 TC 30 Z9 30 U1 0 U2 1 PU ACADEMIC PRESS INC JNL-COMP SUBSCRIPTIONS PI SAN DIEGO PA 525 B ST, STE 1900, SAN DIEGO, CA 92101-4495 SN 0092-640X J9 ATOM DATA NUCL DATA JI Atom. Data Nucl. Data Tables PD NOV PY 1993 VL 55 IS 2 BP 315 EP 348 DI 10.1006/adnd.1993.1024 PG 34 WC Physics, Atomic, Molecular & Chemical; Physics, Nuclear SC Physics GA MR225 UT WOS:A1993MR22500004 ER PT J AU MOORE, JL MCDONALD, WA AF MOORE, JL MCDONALD, WA TI A CASE OF CHRONIC DEPRESSION SO AVIATION SPACE AND ENVIRONMENTAL MEDICINE LA English DT Article AB The authors describe a case of chronic depression in a designated Naval Aviator with a concomitant history of hypothyroidism. The differential diagnosis of dysthymia is discussed and the associated therapeutic alternatives are reviewed. The case demonstrates the importance of comprehensive physical and psychiatric evaluation of those patients with complex or atypical presentations. Issues pertaining to the aeromedical disposition of such patients are discussed, with emphasis on the role of the flight surgeon. RP MOORE, JL (reprint author), USN,INST AEROSP & OPERAT MED,DEPT PSYCHIAT,220 HOVEY RD,NAS,PENSACOLA,FL 32508, USA. NR 5 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 NOV PY 1993 VL 64 IS 11 BP 1051 EP 1058 PG 8 WC Public, Environmental & Occupational Health; Medicine, General & Internal; Sport Sciences SC Public, Environmental & Occupational Health; General & Internal Medicine; Sport Sciences GA ME955 UT WOS:A1993ME95500013 PM 8280040 ER PT J AU VODYANOY, I BEZRUKOV, SM PARSEGIAN, VA AF VODYANOY, I BEZRUKOV, SM PARSEGIAN, VA TI PROBING ALAMETHICIN CHANNELS WITH WATER-SOLUBLE POLYMERS - SIZE-MODULATED OSMOTIC ACTION SO BIOPHYSICAL JOURNAL LA English DT Article ID BILAYER-MEMBRANES; VOLUME CHANGES; ION CHANNEL; VOLTAGE; CONDUCTANCE; ACTIVATION AB Contrary to expectations based on heightened solution viscosity, alamethicin channels appear to speed up in the presence of water soluble polyethylene glycols (PEGs) and dextrans. Specifically, added polymers reduce the probabilities of transition to higher-conductance states but do not change channel lifetimes They thereby shorten the duration of current ''bursts.'' These modified probabilities and kinetics reveal the action of polymer osmotic stress to suppress channel formation. The osmotic action of large, fully excluded polymers shows that some 3,000 angstrom3 of water are taken up by the channel from the solution upon each transition to an adjacent higher-conductance state. The partial osmotic action of incompletely excluded polymers reveals the extent of exclusion for different-size polymers. The partial exclusion thus measured agrees remarkably well with estimates using data on reduction of single-channel conductance by current-impeding polymers. One can relate the degree of each polymer's exclusion to its size and to the radius of the channel pore. C1 NIDDKD,DIV INTRAMURAL RES,BLDG 5,ROOM 405,BETHESDA,MD 20892. OFF NAVAL RES,ARLINGTON,VA 22217. ST PETERSBURG NUCL PHYS INST,ST PETERSBURG 188350,RUSSIA. NIH,DIV COMP RES & TECHNOL,STRUCT BIOL LAB,BETHESDA,MD 20892. NR 21 TC 57 Z9 58 U1 0 U2 5 PU BIOPHYSICAL SOCIETY PI BETHESDA PA 9650 ROCKVILLE PIKE, BETHESDA, MD 20814-3998 SN 0006-3495 J9 BIOPHYS J JI Biophys. J. PD NOV PY 1993 VL 65 IS 5 BP 2097 EP 2105 PG 9 WC Biophysics SC Biophysics GA MF321 UT WOS:A1993MF32100041 PM 7507718 ER PT J AU FRICK, GM HOPPEL, WA AF FRICK, GM HOPPEL, WA TI AIRSHIP MEASUREMENTS OF AEROSOL-SIZE DISTRIBUTIONS, CLOUD DROPLET SPECTRA, AND TRACE GAS CONCENTRATIONS IN THE MARINE BOUNDARY-LAYER SO BULLETIN OF THE AMERICAN METEOROLOGICAL SOCIETY LA English DT Article AB The use of an airship as a platform to conduct atmospheric chemistry, aerosol, and cloud microphysical research is described, and results from demonstration flights made off the Oregon coast are presented. The slow speed of the airship makes it an ideal platform to do high-spatial resolution profiling both vertically and horizontally, and to measure large aerosol and cloud droplet distributions without the difficulties caused by high-speed aircraft sampling. A unique set of data obtained during the demonstration flights show the effect that processing marine boundary layer aerosol through stratus clouds has on the aerosol size distribution. Evidence of new particle formation (nucleation of particles) was also observed on about half the days on which flights were made. RP FRICK, GM (reprint author), USN,RES LAB,DIV REMOTE SENSING,WASHINGTON,DC 20375, USA. NR 11 TC 21 Z9 21 U1 0 U2 2 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 NOV PY 1993 VL 74 IS 11 BP 2195 EP 2202 DI 10.1175/1520-0477(1993)074<2195:AMOASD>2.0.CO;2 PG 8 WC Meteorology & Atmospheric Sciences SC Meteorology & Atmospheric Sciences GA MJ446 UT WOS:A1993MJ44600007 ER PT J AU CROWLEY, JP METZGER, J GRAY, A PIVACEK, LE CASSIDY, G VALERI, CR AF CROWLEY, JP METZGER, J GRAY, A PIVACEK, LE CASSIDY, G VALERI, CR TI INFUSION OF STROMA-FREE CROSS-LINKED HEMOGLOBIN DURING ACUTE GRAM-NEGATIVE BACTEREMIA SO CIRCULATORY SHOCK LA English DT Article DE ENDOTOXIN; HYPOXIA; VENTILATION; NITRIC OXIDE; PLATELETS; ALBUMIN; TRANSFUSION ID NITRIC-OXIDE; INJURY; SHOCK AB Twelve dogs were divided into two groups of six each, and were infused with bis-3,5-dibromosalicyl fumarate stroma-free hemoglobin (DBBF-Hb) or albumin. Their responses to an intravenous bolus of Escherichia coli were followed for 4 hr. Bacterial clearance from the blood stream was studied using standard colony counting methodology as well as blood counts, blood chemistries, and clotting factor analysis. There was a significant difference in mean arterial pressure (MAP) over time between DBBF-Hb-treated dogs and those treated with albumin (P < 0.02). While the DBBF-treated dogs had a higher MAP during the 1 0 min of bacteremia, after 1 hr, there were no longer any appreciable differences between septic dogs treated with DBBF-Hb vs. albumin. Consumption of clotting and natural anticoagulant factors was observed to be similar in both groups, as were endotoxin levels. Blood urea nitrogen (BUN) increased slightly in both groups, while white blood cell counts and clotting factor levels fell in both groups in a similar fashion. There was a more pronounced fall (P < 0.04) in platelet counts in the animals treated with DBBF-Hb. In the dogs treated with DBBF-Hb, there was also a late rise in pCO2 (P < 0.01), a more pronounced fall in pO2, and greater acidosis, which suggested that ventilation perfusion abnormalities may have been exacerbated by DBBF-Hb treatment. Since the exacerbation of respiratory abnormalities was not related to diminished bacterial or endotoxin clearance, the possibility is raised that DBBF-Hb interferes with compensatory respiratory changes during sepsis. (C) 1993 Wiley-Liss, Inc. C1 USN,BLOOD RES LAB,BOSTON,MA. BROWN UNIV,DEPT MED,PROVIDENCE,RI 02912. BOSTON UNIV,SCH MED,BOSTON,MA 02118. RP CROWLEY, JP (reprint author), RHODE ISL HOSP,DIV CLIN HEMATOL,593 EDDY ST,PROVIDENCE,RI 02903, USA. FU NHLBI NIH HHS [KO7HLO125901A1] NR 18 TC 20 Z9 20 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 NOV PY 1993 VL 41 IS 3 BP 144 EP 149 PG 6 WC Cardiac & Cardiovascular Systems SC Cardiovascular System & Cardiology GA ME049 UT WOS:A1993ME04900003 PM 8269643 ER PT J AU ANDERSON, MD KENNEDY, CA WALSH, TP BOWLER, WA AF ANDERSON, MD KENNEDY, CA WALSH, TP BOWLER, WA TI PROSTHETIC VALVE ENDOCARDITIS DUE TO ROTHIA-DENTOCARIOSA SO CLINICAL INFECTIOUS DISEASES LA English DT Letter C1 LEXINGTON CLIN,INFECT DIS SECT,LEXINGTON,KY 40504. USN HOSP,DEPT INTERNAL MED,DIV INFECT DIS,SAN DIEGO,CA 92134. USN HOSP,DEPT INTERNAL MED,DIV CARDIOL,SAN DIEGO,CA 92134. USN HOSP,DEPT CLIN INVEST,SAN DIEGO,CA 92134. NR 8 TC 19 Z9 19 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 NOV PY 1993 VL 17 IS 5 BP 945 EP 946 PG 2 WC Immunology; Infectious Diseases; Microbiology SC Immunology; Infectious Diseases; Microbiology GA ME523 UT WOS:A1993ME52300045 PM 8286658 ER PT J AU BANKER, RD DATAR, SM KEMERER, CF ZWEIG, D AF BANKER, RD DATAR, SM KEMERER, CF ZWEIG, D TI SOFTWARE COMPLEXITY AND MAINTENANCE COSTS SO COMMUNICATIONS OF THE ACM LA English DT Article DE SOFTWARE COMPLEXITY; SOFTWARE ECONOMICS; SOFTWARE MAINTENANCE; PRODUCTIVITY ID PROGRAM REPAIR MAINTENANCE; PRODUCTIVITY; METRICS C1 STANFORD UNIV,GRAD SCH BUSINESS,STANFORD,CA 94305. MIT,ALFRED P SLOAN SCH MANAGEMENT,CAMBRIDGE,MA 02139. USN,POSTGRAD SCH,DEPT ADM SCI,MONTEREY,CA 93943. RP BANKER, RD (reprint author), UNIV MINNESOTA,CARLSON SCH MANAGEMENT,271 19TH AVE S,MINNEAPOLIS,MN 55455, USA. NR 32 TC 101 Z9 103 U1 1 U2 10 PU ASSOC COMPUTING MACHINERY PI NEW YORK PA 1515 BROADWAY, NEW YORK, NY 10036 SN 0001-0782 J9 COMMUN ACM JI Commun. ACM PD NOV PY 1993 VL 36 IS 11 BP 81 EP 94 DI 10.1145/163359.163375 PG 14 WC Computer Science, Hardware & Architecture; Computer Science, Software Engineering; Computer Science, Theory & Methods SC Computer Science GA ME277 UT WOS:A1993ME27700016 ER PT J AU DESCHAMPS, JR KOPECSMYTH, K POPPINO, JL FUTROVSKY, SL WARD, KB AF DESCHAMPS, JR KOPECSMYTH, K POPPINO, JL FUTROVSKY, SL WARD, KB TI COMPARISON OF ORGANOPHOSPHOROUS ACID ANHYDROLASES FROM DIFFERENT SPECIES USING MONOCLONAL-ANTIBODIES SO COMPARATIVE BIOCHEMISTRY AND PHYSIOLOGY C-PHARMACOLOGY TOXICOLOGY & ENDOCRINOLOGY LA English DT Article AB 1. Monoclonal antibodies were raised against squid hepatopancreas organophosphorous acid (OPA) anhydrolase (EC 3.1.8.2) and were used to study structural similarities with OPA anhydrolases isolated from different sources. 2. Common epitopes were identified in OPA anhydrolases with diverse origins, and with different substrate specificities. 3. Epitopes unique to the squid hepatopancreas OPA anhydrolase were identified; optic ganglion and hepatopancreas contain different enzymes which can be distinguished by their epitopes. C1 WALTER REED ARMY INST RES,DIV IMMUNOL,WASHINGTON,DC 20307. RP DESCHAMPS, JR (reprint author), USN,RES LAB,CODE 6030,WASHINGTON,DC 20375, USA. OI Deschamps, Jeffrey/0000-0001-5845-0010 NR 8 TC 5 Z9 5 U1 0 U2 2 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0742-8413 J9 COMP BIOCHEM PHYS C JI Comp. Biochem. Physiol. C-Pharmacol. Toxicol. Endocrinol. PD NOV PY 1993 VL 106 IS 3 BP 765 EP 768 DI 10.1016/0742-8413(93)90240-L PG 4 WC Biochemistry & Molecular Biology; Endocrinology & Metabolism; Toxicology; Zoology SC Biochemistry & Molecular Biology; Endocrinology & Metabolism; Toxicology; Zoology GA MP732 UT WOS:A1993MP73200026 PM 7508356 ER PT J AU BROWN, AW CARNEY, DJ FEILER, PH OBERNDORF, PA ZELKOWITZ, MV AF BROWN, AW CARNEY, DJ FEILER, PH OBERNDORF, PA ZELKOWITZ, MV TI ISSUES IN THE DEFINITION OF A PROJECT SUPPORT ENVIRONMENT REFERENCE MODEL SO COMPUTER STANDARDS & INTERFACES LA English DT Article DE PROJECT SUPPORT ENVIRONMENT; SERVICE-BASED REFERENCE MODEL; FRAMEWORK SERVICES; DATA INTERFACES AB In an effort to establish interface standards to help the US Navy more easily and effectively assemble software-intensive Project Support Environments (PSEs) from commercial sources, the Navy's Next Generation Computer Resources (NGCR) program has set up a Project Support Environment Standards Working Group (PSESWG). The foundation of this group's work is the development of a service-based reference model that will provide context for categorizing and relating existing standards and the identification of interface areas that may benefit from future standardization. This paper presents a report on the lessons learned in the definition of this reference model. C1 SOFTWARE ENGN INST,PITTSBURGH,PA 15213. USN,CTR AIR WARFARE,WARMINSTER,PA 18974. UNIV MARYLAND,DEPT COMP SCI,COLL PK,MD 20742. NR 5 TC 0 Z9 0 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0920-5489 J9 COMP STAND INTER JI Comput. Stand. Interfaces PD NOV PY 1993 VL 15 IS 5 BP 431 EP 443 DI 10.1016/0920-5489(93)90043-Q PG 13 WC Computer Science, Hardware & Architecture; Computer Science, Software Engineering SC Computer Science GA MK682 UT WOS:A1993MK68200003 ER PT J AU RAO, NSV GULATI, S IYENGAR, SS MADAN, RN AF RAO, NSV GULATI, S IYENGAR, SS MADAN, RN TI PARALLEL AND DISTRIBUTED COMPUTING FOR INTELLIGENT SYSTEMS SO COMPUTERS & ELECTRICAL ENGINEERING LA English DT Editorial Material C1 OLD DOMINION UNIV,DEPT COMP SCI,NORFOLK,VA 23529. JET PROP LAB,PASADENA,CA 91109. LOUISIANA STATE UNIV,DEPT COMP SCI,BATON ROUGE,LA 70803. OFF NAVAL RES,DIV ELECTR,ARLINGTON,VA 22217. LOUISIANA STATE UNIV,ROBOT RES LAB,BATON ROUGE,LA 70803. NR 8 TC 0 Z9 0 U1 0 U2 0 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0045-7906 J9 COMPUT ELECTR ENG JI Comput. Electr. Eng. PD NOV PY 1993 VL 19 IS 6 BP R5 EP R8 PG 4 WC Computer Science, Hardware & Architecture; Computer Science, Interdisciplinary Applications; Engineering, Electrical & Electronic SC Computer Science; Engineering GA MG567 UT WOS:A1993MG56700001 ER PT J AU WHITFORD, DJ THORNTON, EB AF WHITFORD, DJ THORNTON, EB TI COMPARISON OF WIND AND WAVE FORCING OF LONGSHORE CURRENTS SO CONTINENTAL SHELF RESEARCH LA English DT Article AB Wind and wave forcing of longshore currents for varying wind conditions and beach slopes are compared using a numerical model. Waves are assumed to be locally generated by the same winds and fully arisen, The finite-depth TMA wind-wave spectrum is used to describe the radiation stress spectrum. Total wind force acting across the surf zone is proportional to surf zone width and therefore inversely proportional to beach slope. Wind force is not important for steep beaches. Total wave force is dependent of wave energy flux and wave direction at breaking, which are functions of the wind speed and direction. Wind force becomes increasingly significant relative to wave force, as wind speed and incident wind direction approaches parallel to shore. For obliquely onshore winds and a gentle beach slope (tan beta = 0.01), wind force can be significant, with wind to wave force ratios ranging from 10 to 100% for winds between 10 and 30 m s-1 and wind and wave directions from 10 to 80-degrees. Thus, under certain wind and wave conditions, wind force can be a first order term in the alongshore momentum balance. RP WHITFORD, DJ (reprint author), USN,POSTGRAD SCH,MONTEREY,CA 93943, USA. NR 28 TC 13 Z9 14 U1 1 U2 3 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 NOV PY 1993 VL 13 IS 11 BP 1205 EP 1218 DI 10.1016/0278-4343(93)90049-4 PG 14 WC Oceanography SC Oceanography GA MK613 UT WOS:A1993MK61300003 ER PT J AU SCHAUM, A AF SCHAUM, A TI THEORY AND DESIGN OF LOCAL INTERPOLATORS SO CVGIP-GRAPHICAL MODELS AND IMAGE PROCESSING LA English DT Article ID RECONSTRUCTION; FFT RP SCHAUM, A (reprint author), USN,RES LAB,CODE 5620,WASHINGTON,DC 20375, USA. NR 20 TC 20 Z9 20 U1 0 U2 0 PU ACADEMIC PRESS INC JNL-COMP SUBSCRIPTIONS PI SAN DIEGO PA 525 B ST, STE 1900, SAN DIEGO, CA 92101-4495 SN 1049-9652 J9 CVGIP-GRAPH MODEL IM PD NOV PY 1993 VL 55 IS 6 BP 464 EP 481 PG 18 WC Computer Science, Software Engineering SC Computer Science GA MH174 UT WOS:A1993MH17400004 ER PT J AU PARK, AE AF PARK, AE TI SOME THOUGHTS ON A SIMPLE MECHANISM FOR THE H-2+H-2-]HE-4 COLD-FUSION REACTION SO FUSION TECHNOLOGY LA English DT Note DE GROUND-STATE FUSION; COMPRESSED-ROTATIONAL-SHIELDED FUSION; ROTATING GROUND STATES AB A speculative mechanism for the creation of He-4 using cold fusion is proposed. The nuclear transformation can be made by the fusion of two excited rotating ground states of deuterium into a highly excited rotating ground state of He-4. Under compression and relatively stable conditions, the formation of such a bound, stretched-out pnnp state of He-4 would be favored (with respect to Coulomb repulsion) over other nuclear ground states without as much angular momentum. The reaction likely occurs at the surface of palladium. A more descriptive name for this reaction is compressed-rotational-shielded (CRS) fusion. Potential experimental conditions for enhancing the initiation of CRS fusion are discussed. C1 USN,CTR WARFARE,DIV WEAP,CHINA LAKE,CA 93555. NR 8 TC 4 Z9 4 U1 0 U2 0 PU AMER NUCLEAR SOCIETY PI LA GRANGE PK PA 555 N KENSINGTON AVENUE, LA GRANGE PK, IL 60525 SN 0748-1896 J9 FUSION TECHNOL JI Fusion Technol. PD NOV PY 1993 VL 24 IS 3 BP 319 EP 323 PG 5 WC Nuclear Science & Technology SC Nuclear Science & Technology GA ME115 UT WOS:A1993ME11500010 ER PT J AU LICHTMAN, DM ROURE, AR AF LICHTMAN, DM ROURE, AR TI EXTERNAL FIXATION FOR THE TREATMENT OF KIENBOCKS-DISEASE SO HAND CLINICS LA English DT Article RP LICHTMAN, DM (reprint author), USN,NATL MED CTR,BETHESDA,MD 20899, USA. NR 0 TC 7 Z9 7 U1 0 U2 0 PU W B SAUNDERS CO PI PHILADELPHIA PA INDEPENDENCE SQUARE WEST CURTIS CENTER, STE 300, PHILADELPHIA, PA 19106-3399 SN 0749-0712 J9 HAND CLIN JI Hand Clin. PD NOV PY 1993 VL 9 IS 4 BP 691 EP 697 PG 7 WC Orthopedics SC Orthopedics GA MW377 UT WOS:A1993MW37700016 PM 8300738 ER PT J AU SCHEPS, R MYERS, JF PAYNE, SA AF SCHEPS, R MYERS, JF PAYNE, SA TI END-PUMPED YB-DOPED FLUORAPATITE LASER SO IEEE PHOTONICS TECHNOLOGY LETTERS LA English DT Article AB An ytterbium:fluorapatite (Yb:FAP) laser crystal is longitudinally prumped using a Ti:sapphire laser emitting at 905 nn. The highest slope efficiency obtained was 60.5%, and the maximum output power was 214 mW with a pump power of 438 mW. Repetitive Q-switching ass demonstrated for the first time. The Q-switched average power was identical to the continuous wave (CW) power at repetition rates exceeding 20 kHz, as is consistent with the 1.08-ms emission lifetime. C1 LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550. RP SCHEPS, R (reprint author), USN,CTR COMMAND CONTROL & OCEAN SURVEILLANCE,DIV RES DEV TEST & EVALUAT,SAN DIEGO,CA 92152, USA. NR 8 TC 9 Z9 9 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 1041-1135 J9 IEEE PHOTONIC TECH L JI IEEE Photonics Technol. Lett. PD NOV PY 1993 VL 5 IS 11 BP 1285 EP 1288 DI 10.1109/68.250045 PG 4 WC Engineering, Electrical & Electronic; Optics; Physics, Applied SC Engineering; Optics; Physics GA MN042 UT WOS:A1993MN04200009 ER PT J AU ESMAN, RD FRANKEL, MY DEXTER, JL GOLDBERG, L PARENT, MG STILWELL, D COOPER, DG AF ESMAN, RD FRANKEL, MY DEXTER, JL GOLDBERG, L PARENT, MG STILWELL, D COOPER, DG TI FIBEROPTIC PRISM TRUE TIME-DELAY ANTENNA FEED SO IEEE PHOTONICS TECHNOLOGY LETTERS LA English DT Article ID PHASED-ARRAY ANTENNAS; DISPERSION; MODULATOR AB We describe and present experimental results for a novel and elegant optical-control technique for implementing a true time delay function for array antennas. A microwave signal is transmitted on a wavelength-tunable optical carrier through a fiber-optic prism-a set of nominally equal-delay fibers with differing net dispersion-to photodetectors that feed each antenna element. The relative interelement time-delay (beam angle) adjustment is accomplished by tuning the optical carrier wavelength. Measured antenna patterns of a two-element array clearly demonstrate beam steering and true time-delay operation over a two-octave bandwidth of 2-8 GHz. C1 JAYCOR,VIENNA,VA 22180. RP ESMAN, RD (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 17 TC 110 Z9 114 U1 1 U2 3 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 1041-1135 J9 IEEE PHOTONIC TECH L JI IEEE Photonics Technol. Lett. PD NOV PY 1993 VL 5 IS 11 BP 1347 EP 1349 DI 10.1109/68.250065 PG 3 WC Engineering, Electrical & Electronic; Optics; Physics, Applied SC Engineering; Optics; Physics GA MN042 UT WOS:A1993MN04200029 ER PT J AU KUNTZMANNCOMBELLES, A LUQI AF KUNTZMANNCOMBELLES, A LUQI TI ADVANCING EUROPE FORTUNES SO IEEE SOFTWARE LA English DT Article C1 USN,WASHINGTON,DC 20350. RP KUNTZMANNCOMBELLES, A (reprint author), PECC TECHNOL,31 AVE GEN LECLERC,F-92340 BOURG LA REINE,FRANCE. NR 1 TC 0 Z9 0 U1 0 U2 0 PU IEEE COMPUTER SOC PI LOS ALAMITOS PA 10662 LOS VAQUEROS CIRCLE, PO BOX 3014, LOS ALAMITOS, CA 90720-1264 SN 0740-7459 J9 IEEE SOFTWARE JI IEEE Softw. PD NOV PY 1993 VL 10 IS 6 BP 14 EP 20 PG 7 WC Computer Science, Software Engineering SC Computer Science GA MF631 UT WOS:A1993MF63100011 ER PT J AU CRAIG, WP RAPPAPORT, CM MASON, JS AF CRAIG, WP RAPPAPORT, CM MASON, JS TI A HIGH APERTURE EFFICIENCY, WIDE-ANGLE SCANNING OFFSET REFLECTOR ANTENNA SO IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION LA English DT Article AB A unique single offset reflector antenna has been designed which provides as much as +/-30-degrees of scanning in azimuth while maintaining a much higher aperture efficiency than a torus antenna. Like a torus antenna, different portions of the reflector are illuminated for each scanned beam. The reflector profile curve in the plane of scan is found by least squares to minimize the error for the beams with the greatest scan angle, and then polynomial terms of up to sixth order which minimize nonplanar phase errors are added to produce a three-dimensional reflector surface. Numerical simulation indicates very good results for all 0.5-degrees beams in the +/-30-degrees azimuth field of view, with peak gain no more than 0.3 dB below ideal and highest side-lobe levels no worse than 13.3 dB below the peak gain. Additionally, comparable performance can be extended to the elevation plane out to 15-degrees / -30-degrees, although full azimuth performance becomes compromised at extreme elevation scan angles. By using an offset design, there is no blockage of the outgoing beam by the feed array assembly for azimuth scanning. With better scan performance than comparably sized paraboloids, and being more compact than similar torus reflectors, this novel antenna should find numerous uses in spacecraft and terrestrial applications. C1 NORTHEASTERN UNIV,BOSTON,MA 02115. RP CRAIG, WP (reprint author), USN,CTR UNDERSEA WARFARE,ANTENNA SYST BRANCH,NEW LONDON,CT 06320, USA. NR 9 TC 7 Z9 7 U1 0 U2 1 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0018-926X J9 IEEE T ANTENN PROPAG JI IEEE Trans. Antennas Propag. PD NOV PY 1993 VL 41 IS 11 BP 1481 EP 1490 DI 10.1109/8.267347 PG 10 WC Engineering, Electrical & Electronic; Telecommunications SC Engineering; Telecommunications GA MM713 UT WOS:A1993MM71300002 ER PT J AU QUONG, JN FARE, TL BRYANT, HJ STENGER, DA AF QUONG, JN FARE, TL BRYANT, HJ STENGER, DA TI MEASUREMENT OF ACETYLCHOLINE-RECEPTOR FUNCTION IN MICROCIRCUIT-COUPLED MYOBLASTS SO IEEE TRANSACTIONS ON BIOMEDICAL ENGINEERING LA English DT Article ID CULTURED-CELLS; ELECTRODES; MEMBRANE; CHANNELS; NEURONS AB An electrophysiological measurement principle for long-term, noninvasive monitoring of the nicotinic acetylcholine receptor (nAChR) function is described. The measurement is based on the ability to record agonist-induced depolarizations of clonal myoblasts that have formed high impedance seals with extracellular microcircuit electrodes. The technique appears promising for several types of assays and environmental monitoring applications. C1 GEOCENTERS INC,FT WASHINGTON,MD 20744. GEORGE WASHINGTON UNIV,SCH ENGN & APPL SCI,WASHINGTON,DC 20052. OHMICRON CORP,BIOSENSOR RES & DEV,NEWTOWN,PA 18940. UNIFORMED SERV UNIV HLTH SCI,DEPT PHYSIOL,BETHESDA,MD 20814. USN,RES LAB,CTR BIOMOLEC SCI & ENGN,WASHINGTON,DC 20375. NR 18 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 0018-9294 J9 IEEE T BIO-MED ENG JI IEEE Trans. Biomed. Eng. PD NOV PY 1993 VL 40 IS 11 BP 1122 EP 1126 DI 10.1109/10.245629 PG 5 WC Engineering, Biomedical SC Engineering GA ML174 UT WOS:A1993ML17400005 PM 8307595 ER PT J AU BOCKER, RP FRIEDEN, BR AF BOCKER, RP FRIEDEN, BR TI SOLUTION OF THE MAXWELL-FIELD-EQUATIONS IN VACUUM FOR ARBITRARY CHARGE AND CURRENT DISTRIBUTIONS USING THE METHODS OF MATRIX ALGEBRA SO IEEE TRANSACTIONS ON EDUCATION LA English DT Article AB Presented in this paper is a new matrix representation of classical electromagnetic theory. The basis of this representation is a space-time, eight-by-eight differential matrix operator. This matrix operator is initially formulated from the differential form of the Maxwell field equations for vacuum. The resulting matrix formulation of Maxwell's equations allows simple and direct derivation of: the electromagnetic wave and charge continuity equations; the Lorentz conditions and definition of the electromagnetic potentials; the Lorentz and Coulomb gauges; the electromagnetic potential wave equations; and Poynting's conservation of energy theorem. A four-dimensional Fourier transform of the matrix equations casts them into an eight-dimensional transfer theorem. The transfer function has an inverse, and this allows the equations to be inverted. This expresses the fields directly in terms of the charge and current source distributions. C1 UNIV ARIZONA,CTR OPT SCI,TUCSON,AZ 85721. RP BOCKER, RP (reprint author), USN COMMAND,CTR CONTROL OCEAN SURVEILLANCE,SAN DIEGO,CA 92152, USA. NR 9 TC 2 Z9 2 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 0018-9359 J9 IEEE T EDUC JI IEEE Trans. Educ. PD NOV PY 1993 VL 36 IS 4 BP 350 EP 356 DI 10.1109/13.241610 PG 7 WC Education, Scientific Disciplines; Engineering, Electrical & Electronic SC Education & Educational Research; Engineering GA MG716 UT WOS:A1993MG71600002 ER PT J AU SCHULER, DL LEE, JS HOPPEL, KW AF SCHULER, DL LEE, JS HOPPEL, KW TI POLARIMETRIC SAR IMAGE SIGNATURES OF THE OCEAN AND GULF-STREAM FEATURES SO IEEE TRANSACTIONS ON GEOSCIENCE AND REMOTE SENSING LA English DT Article ID SYNTHETIC APERTURE RADAR; POLARIZATION AB Polarimetric signatures and related polarimetric properties of microwave ocean backscatter have been analyzed for both the ambient ocean and for ocean features such as those associated with the Gulf Stream. Interpretation of the polarimetric signatures for the ocean surface was accomplished using a tilted-Bragg theoretical model. This model was used to calculate the EM fields, to second order, necessary to compute the full Stokes matrix and, ultimately, the polarimetric signature. The polarimetric studies led to a technique for potentially improving the visibility of all azimuthally traveling waves in real-aperture radar (RAR) images and, very long waves in synthetic-aperture radar (SAR) images. This technique utilizes linear polarization signatures to maximize the instrument sensitivity to azimuthally traveling waves. Wave tilts create a modulation of the cell polarization orientation which, in turn, modulates the backscatter. Critical to the success of this technique are the properties that ocean polarimetric signatures are sharply peaked (i.e., returns are highly polarized). The polarimetric contribution to the overall modulation transfer function has also been evaluated. RP SCHULER, DL (reprint author), USN,RES LAB,DIV REMOTE SENSING,WASHINGTON,DC 20375, USA. NR 17 TC 20 Z9 21 U1 0 U2 5 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0196-2892 J9 IEEE T GEOSCI REMOTE JI IEEE Trans. Geosci. Remote Sensing PD NOV PY 1993 VL 31 IS 6 BP 1210 EP 1221 DI 10.1109/36.317442 PG 12 WC Geochemistry & Geophysics; Engineering, Electrical & Electronic; Remote Sensing; Imaging Science & Photographic Technology SC Geochemistry & Geophysics; Engineering; Remote Sensing; Imaging Science & Photographic Technology GA MQ906 UT WOS:A1993MQ90600009 ER PT J AU LEA, SM LYBANON, M AF LEA, SM LYBANON, M TI AUTOMATED BOUNDARY DELINEATION IN INFRARED OCEAN IMAGES SO IEEE TRANSACTIONS ON GEOSCIENCE AND REMOTE SENSING LA English DT Note AB A mathematical morphology technique aids in interpreting satellite infrared images of the Gulf Stream region. The method delineates the North Wall clearly, with less smoothing than human analysts. Performance in locating warm-core eddies is comparable to that of humans and another automated procedure. A variation of the method finds cold-core eddies. C1 USN,RES LAB,REMOTE SENSING APPLICAT BRANCH,BAY ST LOUIS,MS 39529. RP LEA, SM (reprint author), UNIV N CAROLINA,DEPT MATH,GREENSBORO,NC 27412, USA. NR 12 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 0196-2892 J9 IEEE T GEOSCI REMOTE JI IEEE Trans. Geosci. Remote Sensing PD NOV PY 1993 VL 31 IS 6 BP 1256 EP 1260 DI 10.1109/36.317437 PG 5 WC Geochemistry & Geophysics; Engineering, Electrical & Electronic; Remote Sensing; Imaging Science & Photographic Technology SC Geochemistry & Geophysics; Engineering; Remote Sensing; Imaging Science & Photographic Technology GA MQ906 UT WOS:A1993MQ90600014 ER PT J AU FREDRICKSEN, H AF FREDRICKSEN, H TI THE NUMBER OF NONLINEAR SHIFT REGISTERS THAT PRODUCE ALL VECTORS OF WEIGHT LESS-THAN-OR-EQUAL-TO-T SO IEEE TRANSACTIONS ON INFORMATION THEORY LA English DT Note DE BEST THEOREM; BINARY SEQUENCE; DEBRUIJN GRAPH; CYCLE JOINING; SHIFT REGISTER; SPANNING TREE; TRUTH TABLE AB It has been shown that it is possible to generate a cycle on a nonlinear shift register to contain all vectors of length n and Hamming weight less-than-or-equal-to t. We show how to count the number of different ways this can be done on a truth table of minimum density. C1 CTR COMMUN RES,INST DEF ANAL,SAN DIEGO,CA 92121. USN,POSTGRAD SCH,DEPT MATH,MONTEREY,CA 93943. NR 11 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 0018-9448 J9 IEEE T INFORM THEORY JI IEEE Trans. Inf. Theory PD NOV PY 1993 VL 39 IS 6 BP 1989 EP 1990 DI 10.1109/18.265510 PG 2 WC Computer Science, Information Systems; Engineering, Electrical & Electronic SC Computer Science; Engineering GA MW874 UT WOS:A1993MW87400021 ER PT J AU HARRIS, VG DAS, BN RUBINSTEIN, M GOLDBERG, JL ELAM, WT KOON, NC AF HARRIS, VG DAS, BN RUBINSTEIN, M GOLDBERG, JL ELAM, WT KOON, NC TI STRUCTURAL EVOLUTION AND MAGNETORESISTANCE PROPERTIES OF HEAT-TREATED CU80CO15FE5 RIBBONS SO IEEE TRANSACTIONS ON MAGNETICS LA English DT Article; Proceedings Paper CT 1993 IEEE International Magnetics Conference (INTERMAG 93) CY APR 13-16, 1993 CL STOCKHOLM, SWEDEN SP IEEE, MAGNET SOC ID GIANT MAGNETORESISTANCE; ALLOY-FILMS AB Heat treated Cu80Co15Fe5 melt-spun ribbons were analyzed for their structural and magnetoresistance (MR) properties. Magnetoresistance values were found to be a maximum for the sample annealed at 500-degrees-C. Structural characterization using X-ray diffraction and absorption measurements, together with transmission electron microscopy, show this sample to have two precipitate phases within a Cu-rich fcc matrix; a Co-rich fcc phase and a CoFe bcc phase. Heat treatments at higher temperatures brought about a decrease in MR. Dark field TEM images illustrate the clustering of the precipitate particles concurrent with the decrease in MR suggesting that a clustering mechanism may contribute to the MR effect in these materials. RP HARRIS, VG (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. RI Harris, Vincent/A-8337-2009 NR 10 TC 6 Z9 6 U1 0 U2 0 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0018-9464 J9 IEEE T MAGN JI IEEE Trans. Magn. PD NOV PY 1993 VL 29 IS 6 BP 2616 EP 2618 DI 10.1109/20.280848 PN 1 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied SC Engineering; Physics GA MQ945 UT WOS:A1993MQ94500084 ER PT J AU AYERS, JD HARRIS, VG SPRAGUE, JA ELAM, WT AF AYERS, JD HARRIS, VG SPRAGUE, JA ELAM, WT TI THE LOCAL ATOMIC ORDER OF CU AND FE IN HEAT-TREATED FE73.5NB3CU1SI13.5B9 RIBBONS SO IEEE TRANSACTIONS ON MAGNETICS LA English DT Article; Proceedings Paper CT 1993 IEEE International Magnetics Conference (INTERMAG 93) CY APR 13-16, 1993 CL STOCKHOLM, SWEDEN SP IEEE, MAGNET SOC ID ULTRAFINE GRAIN-STRUCTURE; DEPENDENCE AB EXAFS analysis of amorphous and partially crystallized samples of the soft magnetic alloy Fe73.5Nb3Cu1Si13.5B9 reveal that a portion of the Cu is present in the form of tiny, close packed clusters even before heat treatment. The results suggest that the strong role of Cu in modifying the microstructure of this alloy is due to the clusters acting to catalyze nucleation of Fe rich nanocrystals. RP AYERS, JD (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. RI Harris, Vincent/A-8337-2009 NR 10 TC 32 Z9 34 U1 2 U2 5 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0018-9464 J9 IEEE T MAGN JI IEEE Trans. Magn. PD NOV PY 1993 VL 29 IS 6 BP 2664 EP 2666 DI 10.1109/20.280832 PN 1 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied SC Engineering; Physics GA MQ945 UT WOS:A1993MQ94500100 ER PT J AU GUAN, DX HOW, H CAROSELLA, C VITTORIA, C AF GUAN, DX HOW, H CAROSELLA, C VITTORIA, C TI MAGNETICALLY TUNABLE BAND-PASS FILTER UTILIZING COPLANAR-SLOTLINE JUNCTION SO IEEE TRANSACTIONS ON MAGNETICS LA English DT Article; Proceedings Paper CT 1993 IEEE International Magnetics Conference (INTERMAG 93) CY APR 13-16, 1993 CL STOCKHOLM, SWEDEN SP IEEE, MAGNET SOC AB A novel tunable band-pass tilter using yttrium-iron-garnet (YIG) disk and a coplanar-slotline structure is proposed. The filter is tunable from 0.76 to 14.5 GHz. Over this band of frequencies the maximum insertion loss was 4.9 db and the minimum loss 1.7 db. The planar type device is well suited for the microwave integrated circuits (MIC) planar technology. C1 USN,RES LAB,WASHINGTON,DC 20375. RP GUAN, DX (reprint author), NORTHEASTERN UNIV,ECE DEPT,BOSTON,MA 02115, USA. NR 7 TC 1 Z9 1 U1 0 U2 1 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0018-9464 J9 IEEE T MAGN JI IEEE Trans. Magn. PD NOV PY 1993 VL 29 IS 6 BP 3452 EP 3454 DI 10.1109/20.281193 PN 2 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied SC Engineering; Physics GA MQ946 UT WOS:A1993MQ94600045 ER PT J AU CLARK, AE WUNFOGLE, M RESTORFF, JB LINDBERG, JF AF CLARK, AE WUNFOGLE, M RESTORFF, JB LINDBERG, JF TI MAGNETOSTRICTION AND MAGNETOMECHANICAL COUPLING OF GRAIN-ORIENTED TB0.6DY0.4 SHEET SO IEEE TRANSACTIONS ON MAGNETICS LA English DT Article; Proceedings Paper CT 1993 IEEE International Magnetics Conference (INTERMAG 93) CY APR 13-16, 1993 CL STOCKHOLM, SWEDEN SP IEEE, MAGNET SOC ID TBXDY1-X AB The magnetostriction, magnetization, and Young's moduli were measured on laminated rods of thin Rot rolled sheets of Tb0.6DY0.4 at 77 K. The results were compared to those obtained on single crystals. Approximately 65% of the single crystal saturation magnetostriction was achieved in the. rolled samples. While the hot rolling produces the desired planar texture, the magnetostriction and magnetomechanical coupling strongly depend upon the final heat treatment. C1 USN,CTR UNDERSEA WARFARE,NEW LONDON,CT 06320. RP CLARK, AE (reprint author), USN,CTR SURFACE WARFARE,SILVER SPRING,MD 20903, USA. NR 7 TC 10 Z9 10 U1 0 U2 0 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0018-9464 J9 IEEE T MAGN JI IEEE Trans. Magn. PD NOV PY 1993 VL 29 IS 6 BP 3511 EP 3513 DI 10.1109/20.281213 PN 2 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied SC Engineering; Physics GA MQ946 UT WOS:A1993MQ94600065 ER PT J AU CHANG, W BOSWORTH, B CARTER, GC AF CHANG, W BOSWORTH, B CARTER, GC TI EMPIRICAL RESULTS OF USING BACKPROPAGATION NEURAL NETWORKS TO SEPARATE SINGLE ECHOES FROM MULTIPLE ECHOES SO IEEE TRANSACTIONS ON NEURAL NETWORKS LA English DT Letter AB Empirical results illustrate the pitfalls of applying an artificial neural network (ANN) tb classification of underwater active sonar returns. During training, a back-propagation ANN classifier ''learns'' to recognize two classes of reflected active sonar waveforms. Waveforms in Class 1 have two major sonar echoes or peaks. Waveforms in Class 2 have one major echo or peak Our results show how the classifier ''learns'' to distinguish between the two classes. Testing the ANN classifier with different waveforms having one major-peak and waveforms having two major peaks generated unexpected results: the number of echo peaks, was not the feature used to separate classes. RP CHANG, W (reprint author), USN,CTR UNDERSEA WARFARE,NEW LONDON,CT 06320, USA. NR 6 TC 2 Z9 2 U1 0 U2 0 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 1045-9227 J9 IEEE T NEURAL NETWOR JI IEEE Trans. Neural Netw. PD NOV PY 1993 VL 4 IS 6 BP 993 EP 995 DI 10.1109/72.286895 PG 3 WC Computer Science, Artificial Intelligence; Computer Science, Hardware & Architecture; Computer Science, Theory & Methods; Engineering, Electrical & Electronic SC Computer Science; Engineering GA MW899 UT WOS:A1993MW89900011 PM 18276530 ER PT J AU TEHRANI, FT FORD, RE AF TEHRANI, FT FORD, RE TI PHASE EQUALIZATION OF ONE-DIMENSIONAL AND 2-DIMENSIONAL RECURSIVE FILTERS SO IEEE TRANSACTIONS ON SIGNAL PROCESSING LA English DT Letter ID MAGNITUDE; DESIGN AB An effective optimization algorithm is proposed to design multidimensional recursive phase equalizers. The optimization algorithm uses the modified version of the Rosenbrock pattern search method to minimize the maximum group delay ripple. This numerical method eliminates the increased complexity that derivative methods show when multiple variables are to be found. The criteria used to guarantee the stability of the equalizer are based on the DeCarlo-Strintzis theorem. By applying this theorem, the stability test procedure in m dimensions is reduced to m one-dimensional stability test routines. Using this stabilization technique and the Rosenbrock pattern search method for optimization, the intensity of computations is considerably reduced in higher dimensions. C1 USN,CTR WARFARE ASSESSMENT,PERFORMANCE ASSESSMENT DIRECTORATE,CORONA,CA 91718. RP TEHRANI, FT (reprint author), CALIF STATE UNIV FULLERTON,DEPT ELECT ENGN,FULLERTON,CA 92634, USA. NR 9 TC 0 Z9 0 U1 0 U2 0 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 1053-587X J9 IEEE T SIGNAL PROCES JI IEEE Trans. Signal Process. PD NOV PY 1993 VL 41 IS 11 BP 3193 EP 3196 DI 10.1109/78.257254 PG 4 WC Engineering, Electrical & Electronic SC Engineering GA MH408 UT WOS:A1993MH40800016 ER PT J AU SCHNEIDEWIND, NF AF SCHNEIDEWIND, NF TI SOFTWARE-RELIABILITY MODEL WITH OPTIMAL SELECTION OF FAILURE DATA SO IEEE TRANSACTIONS ON SOFTWARE ENGINEERING LA English DT Article DE NHPP SOFTWARE RELIABILITY MODEL; OPTIMAL SELECTION OF FAILURE DATA; SPACE SHUTTLE APPLICATION ID R SWITCHING-SYSTEM AB In the use of software reliability models it is not necessarily the case that all the failure data should be used to estimate model parameters and to predict failures. The reason for this is that old data may not be as representative of the current and future failure process as recent data. Therefore, it may be possible to obtain more accurate predictions of future failures by excluding or giving lower weight to the earlier failure counts. Although ''data aging'' techniques such as moving average and exponential smoothing are frequently used in other fields, such as inventory control, we did not find use of data aging in the various models we surveyed. One model that includes the concept of selecting a subset of the failure data is the Schneidewind Non-Homogeneous Poisson Process (NHPP) software reliability model. In order to use the concept of data aging, there must be a criterion for determining the optimal value of the starting failure count interval. We evaluated four criteria for identifying the optimal starting interval for estimating model parameters. Three of the criteria are novel. Two of these treat the failure count interval index as a parameter by substituting model functions for data vectors and optimizing on functions obtained from maximum likelihood estimation techniques. The third one uses weighted least squares to maintain constant variance in the presence of the decreasing failure rate assumed by the model. The fourth criterion is the familiar mean square error. Our research showed that significantly improved reliability predictions can be obtained by using a subset of the failure data, based on applying the appropriate criteria, and using the Space Shuttle On-Board software as an example. RP SCHNEIDEWIND, NF (reprint author), USN,POSTGRAD SCH,MONTEREY,CA 93943, USA. NR 21 TC 26 Z9 27 U1 0 U2 0 PU IEEE COMPUTER SOC PI LOS ALAMITOS PA 10662 LOS VAQUEROS CIRCLE, PO BOX 3014, LOS ALAMITOS, CA 90720-1264 SN 0098-5589 J9 IEEE T SOFTWARE ENG JI IEEE Trans. Softw. Eng. PD NOV PY 1993 VL 19 IS 11 BP 1095 EP 1104 DI 10.1109/32.256856 PG 10 WC Computer Science, Software Engineering; Engineering, Electrical & Electronic SC Computer Science; Engineering GA MM225 UT WOS:A1993MM22500008 ER PT J AU ROGERS, GW SOLKA, J MALYEVAC, DS PRIEBE, CE AF ROGERS, GW SOLKA, J MALYEVAC, DS PRIEBE, CE TI A SELF-ORGANIZING NETWORK FOR COMPUTING A POSTERIORI CONDITIONAL CLASS PROBABILITY SO IEEE TRANSACTIONS ON SYSTEMS MAN AND CYBERNETICS LA English DT Article ID NEURAL NETWORKS; VECTOR QUANTIZATION; CLASSIFICATION AB This paper describes a neural network architecture whose goal is the computation of a posteriori conditional class probabilities for input vectors that belong to one of two input classes. The network architecture has been designed to adaptively produce Voronoi tessellation partitions of the input vectors in R(n) based on the Euclidean distance metric, without regard to the actual a priori class probabilities of the input vectors. These prior probabilities are then used by the network to adaptively compute the a posteriori conditional class probability for the two glasses for each tessellation partition. The network presented is thus a connectionist model for vector quantization clustering and includes the process of automatic node creation necessary for many unsupervised learning applications. RP ROGERS, GW (reprint author), USN,CTR SURFACE WARFARE,DAHLGREN DIV,DAHLGREN,VA 22448, USA. RI Priebe, Carey E./A-3305-2010 NR 20 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 0018-9472 J9 IEEE T SYST MAN CYB JI IEEE Trans. Syst. Man Cybern. PD NOV-DEC PY 1993 VL 23 IS 6 BP 1672 EP 1682 DI 10.1109/21.257762 PG 11 WC Computer Science, Cybernetics; Engineering, Electrical & Electronic SC Computer Science; Engineering GA MT274 UT WOS:A1993MT27400015 ER PT J AU MOFFETT, MB RICKETTS, D AF MOFFETT, MB RICKETTS, D TI CHARACTERIZATION OF PIEZOCERAMICS - COMMENT SO IEEE TRANSACTIONS ON ULTRASONICS FERROELECTRICS AND FREQUENCY CONTROL LA English DT Letter AB Brissaud1 attempted to solve several piezoceramic bar, plate, and disk problems by superposition of bulk longitudinal waves. However, because he neglected the shear wave contributions, his solutions do not satisfy the appropriate stress-free boundary conditions. C1 RAYTHEON CO,DIV SUBMARINE SIGNAL,PORTSMOUTH,RI 02871. RP MOFFETT, MB (reprint author), USN,CTR UNDERSEA WARFARE,NEW LONDON,CT 06320, USA. NR 1 TC 2 Z9 2 U1 0 U2 1 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0885-3010 J9 IEEE T ULTRASON FERR JI IEEE Trans. Ultrason. Ferroelectr. Freq. Control PD NOV PY 1993 VL 40 IS 6 BP 825 EP 825 DI 10.1109/58.248229 PG 1 WC Acoustics; Engineering, Electrical & Electronic SC Acoustics; Engineering GA MK222 UT WOS:A1993MK22200026 PM 18263252 ER PT J AU WAX, JR CHANNELL, JC VANDERSLOOT, JA AF WAX, JR CHANNELL, JC VANDERSLOOT, JA TI PACKING OF THE LOWER UTERINE SEGMENT - NEW APPROACH TO AN OLD TECHNIQUE SO INTERNATIONAL JOURNAL OF GYNECOLOGY & OBSTETRICS LA English DT Letter DE POSTPARTUM HEMORRHAGE; UTERINE ATONY; PLACENTAL IMPLANTATION RP WAX, JR (reprint author), USN,DEPT OBSTET & GYNECOL,DIV MATERNAL FETAL MED,PORTSMOUTH,VA 23708, USA. NR 2 TC 7 Z9 11 U1 0 U2 0 PU ELSEVIER SCI IRELAND LTD PI CLARE PA CUSTOMER RELATIONS MANAGER, BAY 15, SHANNON INDUSTRIAL ESTATE CO, CLARE, IRELAND SN 0020-7292 J9 INT J GYNECOL OBSTET JI Int. J. Gynecol. Obstet. PD NOV PY 1993 VL 43 IS 2 BP 197 EP 198 DI 10.1016/0020-7292(93)90331-P PG 2 WC Obstetrics & Gynecology SC Obstetrics & Gynecology GA MJ560 UT WOS:A1993MJ56000015 PM 7905439 ER PT J AU KARLE, IL FLIPPENANDERSON, JL UMA, K BALARAM, P AF KARLE, IL FLIPPENANDERSON, JL UMA, K BALARAM, P TI PEPTIDE MIMICS FOR STRUCTURAL FEATURES IN PROTEINS - CRYSTAL-STRUCTURES OF 3 HEPTAPEPTIDE HELICES WITH A C-TERMINAL 6-]1 HYDROGEN-BOND SO INTERNATIONAL JOURNAL OF PEPTIDE AND PROTEIN RESEARCH LA English DT Article DE ANTIPARALLEL ASSEMBLY OF HELICES; PARALLEL ASSEMBLY OF HELICES; 310-/ALPHA-HELICES; X-RAY CRYSTALLOGRAPHY ID ALPHA-AMINOISOBUTYRIC-ACID; MODULAR DESIGN; LINEAR OLIGOPEPTIDES; AMINO-ACIDS; RESIDUES; APOLAR; STEREOCHEMISTRY; CONFORMATIONS; DECAPEPTIDES; AGGREGATION AB The crystal structure determination of three heptapeptides containing alpha-aminoisobutyryl (Aib) residues as a means of helix stabilization provides a high-resolution characterization of 6 --> 1 hydrogen-bonded conformations, reminiscent of helix-terminating structural features in proteins. The crystal parameters for the three peptides, Boc-Val-Aib-X-Aib-Ala-Aib-Y-OMe, where X and Y are Phe, Leu (I), Leu, Phe (II) and Leu, Leu (III) are: (1) space group P1, Z = 1, a = 9.903 angstrom, b = 10.709 angstrom, c = 11.969 angstrom, alpha = 102.94-degrees, beta = 103.41-degrees, gamma = 92.72-degrees, R = 4.55%; (II) space group P2(1), Z = 2, a = 10.052, b = 17.653 angstrom, c = 13.510 angstrom, beta = 108.45-degrees, R = 4.49%; (III) space group P1, Z = 2 (two independent molecules IIIa and IIIb in the asymmetric unit), a = 10.833 angstrom, b = 13.850 angstrom, c = 16.928 angstrom, alpha = 99.77-degrees, beta = 105.90-degrees, gamma = 90.64-degrees, R = 8.54%. In all cases the helices form 3(10)/alpha-helical (or 3(10)-helical) structures, with helical columns formed by head-to-tail hydrogen bonding. The helices assemble in an all-parallel motif in crystals I and III and in an antiparallel motif in II. In the four crystallographically characterized molecules, I, II, IIIa and IIIb, Aib(6) adopts a left-handed helical (h(L)) conformation with positive phi, psi values, resulting in 6 --> 1 hydrogen-bond formation between Aib(2) CO and Leu(7)/Phe(7) NH groups. In addition a 4 --> 1 hydrogen bond is seen between Aib(3) CO and Aib(6) NH groups. This pattern of hydrogen bonding is often observed at the C-terminus of helices in proteins, with the terminal pi-type turn being formed by four residues adopting the h(R)h(R)h(R)h(L) conformation. (C) Munksgaard 1993. 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 [GM-30902] NR 27 TC 38 Z9 38 U1 0 U2 1 PU MUNKSGAARD INT PUBL LTD PI COPENHAGEN PA 35 NORRE SOGADE, PO BOX 2148, DK-1016 COPENHAGEN, DENMARK SN 0367-8377 J9 INT J PEPT PROT RES JI Int. J. Pept. Protein Res. PD NOV PY 1993 VL 42 IS 5 BP 401 EP 410 PG 10 WC Biochemistry & Molecular Biology SC Biochemistry & Molecular Biology GA MF789 UT WOS:A1993MF78900001 PM 8106192 ER PT J AU KERN, SB AF KERN, SB TI VORTEX FLOW-CONTROL USING FILLETS ON A DOUBLE-DELTA WING SO JOURNAL OF AIRCRAFT LA English DT Article AB This article presents results from a subsonic numerical investigation on the effects of geometry modifications at the junction of the leading edge extension (LEX) and wing of a flat-plate cropped double-delta wing at moderate to high angles of attack. The baseline planform of the double-delta wing configuration consisted of a strake with a 76-deg leading-edge sweep and a wing with a 40-deg leading-edge sweep with sharp, beveled leading edges. The geometry modifications included various fillet shapes with planform areas equal to 1% of the baseline wing reference area. A hyperbolic grid generation method was developed and used in conjunction with an existing interactive grid generation system to create high quality C-O type multiblock grids about the configurations studied. The Euler and Reynolds averaged Navier-Stokes (RANS) equations were solved numerically using two finite-volume production flow solvers. The baseline configuration numerical results correlated well with existing published experimental data. Grid refinement using the RANS revealed vortex sheet tearing on the wing. Fillets enhanced the lift by 14% at low angle of attack, and 18% at high angle of attack with a slight improvement in lift-to-drag ratio. The fillets may be good candidates for roll control devices. RP KERN, SB (reprint author), USN,CTR AIR WARFARE,DIV AIRCRAFT,WARMINSTER,PA 18974, USA. NR 0 TC 13 Z9 13 U1 0 U2 0 PU AMER INST AERONAUT ASTRONAUT PI RESTON PA 1801 ALEXANDER BELL DRIVE, STE 500, RESTON, VA 22091 SN 0021-8669 J9 J AIRCRAFT JI J. Aircr. PD NOV-DEC PY 1993 VL 30 IS 6 BP 818 EP 825 DI 10.2514/3.46422 PG 8 WC Engineering, Aerospace SC Engineering GA ML016 UT WOS:A1993ML01600006 ER PT J AU ELTON, RC BILLINGS, DM GRUN, J YOUNG, FC MANKA, CK RIPIN, BH BURRIS, HR RESNICK, J RIPIN, DJ MILLARD, JR AF ELTON, RC BILLINGS, DM GRUN, J YOUNG, FC MANKA, CK RIPIN, BH BURRIS, HR RESNICK, J RIPIN, DJ MILLARD, JR TI X-RAY-DAMAGE TO OPTICAL-COMPONENTS USING A LASER-PLASMA SOURCE SO JOURNAL OF APPLIED PHYSICS LA English DT Article ID CONVERSION EFFICIENCY; TARGETS; RADIATION AB X-ray damage to optical surfaces consisting of melting, fracturing, cracking, and cratering is produced, and then analyzed using interference contrast microscopy and stylus profilometery. The test samples are irradiated by 0.5-1.6 keV x rays at fluence levels up to 5.5 cal/cm2. The x rays originate from L-shell transitions in copper ions, produced when 1.25-mum-thick targets are irradiated at 1.3 kJ energy by a 1.054 mum wavelength laser. The x-ray emission is found to be nearly isotropic over 2pi sr, while the plasma mass-flow distribution is peaked along the laser axis. Hence, contamination of the test sample by target debris or plasma is greatly reduced by placing the samples off axis from the laser beam, in addition to the use of beryllium shields. C1 RES SUPPORT INSTRUMENTS INC,ALEXANDRIA,VA 22314. JAYCOR INC,VIENNA,VA 22180. JAYCOR INC,SAN DIEGO,CA 92121. RP ELTON, RC (reprint author), USN,RES LAB,DIV PLASMA PHYS,WASHINGTON,DC 20375, USA. NR 18 TC 12 Z9 12 U1 0 U2 1 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0021-8979 J9 J APPL PHYS JI J. Appl. Phys. PD NOV 1 PY 1993 VL 74 IS 9 BP 5432 EP 5436 DI 10.1063/1.354250 PG 5 WC Physics, Applied SC Physics GA MG597 UT WOS:A1993MG59700023 ER PT J AU KHAN, MA OLSON, DT KUZNIA, JN CARLOS, WE FREITAS, JA AF KHAN, MA OLSON, DT KUZNIA, JN CARLOS, WE FREITAS, JA TI THE NATURE OF DONOR CONDUCTION IN N-GAN SO JOURNAL OF APPLIED PHYSICS LA English DT Note ID CHEMICAL VAPOR-DEPOSITION; BUFFER LAYER; GROWTH AB Single crystal GaN thin films resulting from various deposition techniques are usually dominated by residual donors. To date, the true nature of this donor conduction is not known. Nitrogen vacancies, residual oxygen, and growth defects are cited as potential causes for the residual n-type conduction. In this communication we present the first systematic study of near conduction band edge states in n-type GaN samples deposited over basal plane sapphire substrates using low pressure metal organic chemical vapor deposition. Electron spin resonance, low temperature photoluminescence, and Van der Pauw-Hall measurements were used as the basis for our study. We concluded that the residual n-type conduction in GaN results from a band of delocalized donors. C1 USN,RES LAB,WASHINGTON,DC 20375. SACHS FREEMAN ASSOCIATES INC,LANDOVER,MD 20785. RP KHAN, MA (reprint author), APA OPT INC,2950 NE 84TH LANE,BLAINE,MN 55434, USA. NR 10 TC 20 Z9 20 U1 1 U2 8 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0021-8979 J9 J APPL PHYS JI J. Appl. Phys. PD NOV 1 PY 1993 VL 74 IS 9 BP 5901 EP 5903 DI 10.1063/1.354168 PG 3 WC Physics, Applied SC Physics GA MG597 UT WOS:A1993MG59700098 ER PT J AU MOWREY, RC AF MOWREY, RC TI DISSOCIATIVE ADSORPTION OF H-2 USING THE CLOSE-COUPLING WAVE-PACKET METHOD SO JOURNAL OF CHEMICAL PHYSICS LA English DT Article ID DEPENDENT SCHRODINGER-EQUATION; ABSORBING BOUNDARY-CONDITIONS; MOLECULE SURFACE SCATTERING; QUANTUM DYNAMICS; CHEMISORPTION; HYDROGEN; NI(100); MODEL; NI AB A time-dependent quantum mechanical wave packet method was used to study the dynamics of the dissociative adsorption of H-2 and D2 on a flat, static surface. A three-dimensional (3D) model was used in which the molecular rotational, vibrational, and center-of-mass translational motion normal to the surface are treated. In the close-coupling wave packet method the wave function is represented using a combination of a basis set expansion for the rotational degrees of freedom and a 2D L-shaped grid for the vibrational and translational coordinates. The time propagation is carried out by expanding the time-evolution operator in a series of Chebyshev polynomials. The molecule-surface interaction is described using a modified London-Eyring-Polanyi-Sato (LEPS) potential with parameters chosen to represent the H-2/Ni(100) system. The dissociation probability was calculated for different incident energies and initial rotational and vibrational states and compared to the results of other theoretical calculations. Higher incident energies are required for D2 dissociation than for H-2. The barrier height and zero-point energies at the saddle point can be determined from the energy dependence of the dissociation probabilities for H-2 and D2. RP MOWREY, RC (reprint author), USN,RES LAB,THEORET CHEM SECT,CODE 6179,WASHINGTON,DC 20375, USA. NR 27 TC 54 Z9 54 U1 0 U2 1 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0021-9606 J9 J CHEM PHYS JI J. Chem. Phys. PD NOV 1 PY 1993 VL 99 IS 9 BP 7049 EP 7055 DI 10.1063/1.465424 PG 7 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA MD981 UT WOS:A1993MD98100089 ER PT J AU ZEZULAK, M SNYDER, JJ NEEDLEMAN, SB AF ZEZULAK, M SNYDER, JJ NEEDLEMAN, SB TI SIMULTANEOUS ANALYSIS OF CODEINE, MORPHINE, AND HEROIN AFTER B-GLUCURONIDASE HYDROLYSIS SO JOURNAL OF FORENSIC SCIENCES LA English DT Article DE TOXICOLOGY; OPIATE GLUCURONIDES; B-GLUCURONIDASE; DIPROPIONYLMORPHINE; HEROIN ID URINE; 6-ACETYLMORPHINE; SPECTROMETRY AB Analysis of the opiates, morphine and codeine, often proceeds by way of acid hydrolysis for release of the parent morphine from its glucuronide formed during metabolism. Following use, heroin is rapidly deacetylated to 6-monoacetylmorphine (B-MAM), which can be detected in the urine for a short time following injection of heroin. Only a small amount of 6-MAM may be further metabolized to morphine glucuronide. Thus, in general, the urine specimen has not been hydrolyzed prior to analysis for heroin, using a separate procedure from morphine and codeine. Simultaneous analysis of morphine, codeine, 6-MAM and heroin would be complicated by loss of identity between morphine and heroin when heroin converts to morphine following acid hydrolysis for removal of the glucuronide moiety from morphine glucuronide. Another significant problem in simultaneous analysis is the relative disparity in concentration between morphine/codeine and 6-MAM/heroin (which might be present in the urine specimen). In the proposed method of analysis, free morphine resulting from B-glucuronidase rather than acid hydrolysis of morphine glucuronide is derivatized with propionic anhydride to form dipropionylmorphine. Heroin that does not react with B-glucuronidase remains unhydrolyzed as the diacetylmorphine derivative. Some of the more exacting steps for the acid procedure are eliminated altogether making overall costs for the enzyme procedure comparable to those of the acid hydrolysis method. The enzyme reaction mixture is purified through a solid phase column system. The optimal conditions for concentration of enzyme, temperature of hydrolysis and pH are individually characterized for B-glucuronidase hydrolysis and the ions which identify the propionyl derivatives are characterized for the simultaneous analysis of morphine, codeine, 6-MAM and heroin. C1 USN, DRUG SCREENING LAB, DEPT CONFIRMAT, GREAT LAKES, IL 60088 USA. NR 17 TC 20 Z9 22 U1 0 U2 5 PU AMER SOC TESTING MATERIALS PI W CONSHOHOCKEN PA 100 BARR HARBOR DR, W CONSHOHOCKEN, PA 19428-2959 SN 0022-1198 J9 J FORENSIC SCI JI J. Forensic Sci. PD NOV PY 1993 VL 38 IS 6 BP 1275 EP 1285 PG 11 WC Medicine, Legal SC Legal Medicine GA MH369 UT WOS:A1993MH36900012 PM 8263474 ER PT J AU MUKHERJEE, R JUNKINS, JL AF MUKHERJEE, R JUNKINS, JL TI INVARIANT SET ANALYSIS OF THE HUB-APPENDAGE PROBLEM SO JOURNAL OF GUIDANCE CONTROL AND DYNAMICS LA English DT Note C1 TEXAS A&M UNIV SYST, DEPT AEROSP ENGN, COLL STN, TX 77843 USA. RP MUKHERJEE, R (reprint author), USN, POSTGRAD SCH, DEPT MECH ENGN, MONTEREY, CA 93943 USA. RI Mukherjee, Ranjan/A-7518-2009 NR 7 TC 8 Z9 8 U1 0 U2 1 PU AMER INST AERONAUT ASTRONAUT PI RESTON PA 1801 ALEXANDER BELL DRIVE, STE 500, RESTON, VA 22091-4344 USA SN 0731-5090 J9 J GUID CONTROL DYNAM JI J. Guid. Control Dyn. PD NOV-DEC PY 1993 VL 16 IS 6 BP 1191 EP 1193 DI 10.2514/3.21149 PG 3 WC Engineering, Aerospace; Instruments & Instrumentation SC Engineering; Instruments & Instrumentation GA MF998 UT WOS:A1993MF99800031 ER PT J AU ZACHER, RA SAULNIER, G FRITZ, GG VANVECHTEN, D KANG, J AF ZACHER, RA SAULNIER, G FRITZ, GG VANVECHTEN, D KANG, J TI NB/AL/ALOX/NB SUPERCONDUCTING TUNNEL-JUNCTIONS AS X-RAY-DETECTORS SO JOURNAL OF LOW TEMPERATURE PHYSICS LA English DT Article; Proceedings Paper CT 5TH INTERNATIONAL WORKSHOP ON LOW TEMPERATURE DETECTORS ( LTD-5 ) CY JUL 29-AUG 03, 1993 CL UNIV CALIF BERKELEY, BERKELEY, CA HO UNIV CALIF BERKELEY ID RESOLUTION AB Nb/Al/AlOx/Nb junctions have been shown to be effective x-ray detectors that are robust to thermal cycling. We compare results from two junctions, one with a fine-grained base-layer electrode and counterelectrode and the other with an epitaxial base-layer electrode and a fine-grained counterelectrode. For a 6 keV x-ray, at 0.4 K, the epitaxial sample had a FWHM resolution of 157 eV and the fine-grained junction had a FWHM resolution of 300 eV. The differences between the junctions will be discussed. C1 WESTINGHOUSE SCI & TECHNOL CTR,PITTSBURGH,PA. RP ZACHER, RA (reprint author), USN,RES LAB,E O HULBURT CTR SPACE RES,WASHINGTON,DC 20375, USA. NR 6 TC 2 Z9 2 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 NOV PY 1993 VL 93 IS 3-4 BP 581 EP 586 DI 10.1007/BF00693479 PG 6 WC Physics, Applied; Physics, Condensed Matter SC Physics GA MK002 UT WOS:A1993MK00200062 ER PT J AU SAULNIER, GG ZACHER, RA FRITZ, GG HUNT, B LEDUC, HG JUDAS, A AF SAULNIER, GG ZACHER, RA FRITZ, GG HUNT, B LEDUC, HG JUDAS, A TI NBN/MGO/NBN SUPERCONDUCTING TUNNEL-JUNCTIONS AS X-RAY-DETECTORS SO JOURNAL OF LOW TEMPERATURE PHYSICS LA English DT Article; Proceedings Paper CT 5TH INTERNATIONAL WORKSHOP ON LOW TEMPERATURE DETECTORS ( LTD-5 ) CY JUL 29-AUG 03, 1993 CL UNIV CALIF BERKELEY, BERKELEY, CA HO UNIV CALIF BERKELEY ID QUASIPARTICLE; RESOLUTION; ENERGY AB We report on our work using NbN/MgO/NbN junctions for the detection of x-rays. Detectors based on superconducting tunneling junctions offer the prospect of energy resolution over an order of magnitude higher than is obtainable with the current generation of semiconductor-based detectors NbN is interesting due to the possibility of its use in trapping layer devices. The junctions were fabricated at the NASA Jet Propulsion Laboratory (JPL) with an area of 4 mum by 4 mum. They were tested at the Naval Research Laboratory (NRL) in an applied magnetic field of approximately 250 gauss, a current bias of several hundred nanoamps and an operating temperature of 1.7 K. C1 UNIV SPACE RES ASSOC,WASHINGTON,DC. NASA,JET PROP LAB,PASADENA,CA 91109. RP SAULNIER, GG (reprint author), USN,RES LAB,EO HULBURT CTR SPACE RES,WASHINGTON,DC 20375, USA. NR 9 TC 1 Z9 1 U1 1 U2 1 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 NOV PY 1993 VL 93 IS 3-4 BP 653 EP 658 DI 10.1007/BF00693491 PG 6 WC Physics, Applied; Physics, Condensed Matter SC Physics GA MK002 UT WOS:A1993MK00200074 ER PT J AU VANVECHTEN, D BLAMIRE, MG FRITZ, GG KIRK, ECG SAULNIER, G WARBURTON, PA WOOD, KS ZACHER, R AF VANVECHTEN, D BLAMIRE, MG FRITZ, GG KIRK, ECG SAULNIER, G WARBURTON, PA WOOD, KS ZACHER, R TI DESIGN CONSIDERATIONS FOR STJ X-RAY-DETECTORS SO JOURNAL OF LOW TEMPERATURE PHYSICS LA English DT Article; Proceedings Paper CT 5TH INTERNATIONAL WORKSHOP ON LOW TEMPERATURE DETECTORS ( LTD-5 ) CY JUL 29-AUG 03, 1993 CL UNIV CALIF BERKELEY, BERKELEY, CA HO UNIV CALIF BERKELEY AB The geometrical shape and layer thicknesses of superconducting tunnel junctions (STJ) influence their suitability as x-ray detectors. Examples relating to field biasing are discussed. Two related energy loss mechanisms are also modeled. C1 UNIV CAMBRIDGE,DEPT MET & MAT SCI,CAMBRIDGE,ENGLAND. UNIV SPACE RES ASSOCIATES,COLUMBIA,MD. USN,RES LAB,NAT RES COUNCIL,WASHINGTON,DC 20375. RP VANVECHTEN, D (reprint author), USN,RES LAB,DIV SPACE SCI,WASHINGTON,DC 20375, USA. RI Warburton, Paul/B-6987-2009 NR 9 TC 1 Z9 1 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 NOV PY 1993 VL 93 IS 3-4 BP 671 EP 676 PG 6 WC Physics, Applied; Physics, Condensed Matter SC Physics GA MK002 UT WOS:A1993MK00200077 ER PT J AU OLIVER, SA VITTORIA, C KREBS, JJ LUBITZ, P PRINZ, GA AF OLIVER, SA VITTORIA, C KREBS, JJ LUBITZ, P PRINZ, GA TI ANISOTROPIC ANTIFERROMAGNETIC INTERLAYER COUPLING IN FE/CR/FE FILMS SO JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS LA English DT Article ID FE LAYERS; GIANT MAGNETORESISTANCE; CR; EXCHANGE AB In-plane and oblique-angle ferromagnetic resonance measurements were performed on Fe/Cr/Fe samples in order to measure the exchange coupling values between the magnetic layers for the in-plane and normal geometries. Samples consisted of well characterized Fe/Cr sandwiches grown by molecular beam epitaxy onto (001) GaAs with different Cr layer thicknesses (t(Cr)). All samples had previously been shown by other experimental techniques to have antiferromagnetic coupling of the Fe layers. For one sample (t(Cr) = 20 angstrom) the deduced in-plane and perpendicular values of the exchange coupling coincide. In the second sample (t(Cr) = 13 angstrom) the deduced exchange coupling values for in-plane and perpendicular magnetization orientations were found to differ by 10%. C1 NORTHEASTERN UNIV,DEPT ELECT & COMP ENGN,BOSTON,MA 02115. USN,RES LAB,WASHINGTON,DC 20375. RP OLIVER, SA (reprint author), NORTHEASTERN UNIV,CTR ELECTROMAGNET RES,235 FORSYTH BLDG,360 HUNTINGTON AVE,BOSTON,MA 02115, USA. NR 14 TC 1 Z9 1 U1 1 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 NOV PY 1993 VL 128 IS 1-2 BP 151 EP 156 DI 10.1016/0304-8853(93)90870-8 PG 6 WC Materials Science, Multidisciplinary; Physics, Condensed Matter SC Materials Science; Physics GA MH733 UT WOS:A1993MH73300025 ER PT J AU MATSUZAWA, M POTEMBER, RS STENGER, DA KRAUTHAMER, V AF MATSUZAWA, M POTEMBER, RS STENGER, DA KRAUTHAMER, V TI CONTAINMENT AND GROWTH OF NEUROBLASTOMA-CELLS ON CHEMICALLY PATTERNED SUBSTRATES SO JOURNAL OF NEUROSCIENCE METHODS LA English DT Article DE CHEMICALLY PATTERNED SUBSTRATE; SELF-ASSEMBLED MONOLAYER FILM; UV IRRADIATION; NONADHESIVE SURFACE; SK-N-SH NEUROBLASTOMA CELL; CELL CONTAINMENT; CELL GROWTH ID COPLANAR MOLECULAR ASSEMBLIES; MONOLAYERS; OUTGROWTH; GUIDANCE; ADHESION; SURFACE; CULTURE; NEURONS AB Patterned substrates offer the promise of controlled positioning and directional guidance of growing neurites. Therefore, they could be useful for constructing small neuronal networks with defined geometry in vitro. We have fabricated chemically patterned substrates using self-assembled monolayer films with a lithographic mask technique and demonstrated the feasibility for geometrically patterning neuroblastoma cells in culture. N-octadecyltrichlorosilane (OTS) was chemically bonded to glass and fused silica substrates, rendering the surface hydrophobic and non-adhesive to cells. Using surface analysis techniques,:we have confirmed that OTS films were true monolayers and can be photocleaved from the surface by deep W irradiation. An adhesive pattern of n-(2-aminoethyl-3-aminopropyl)trimethoxy was formed on a selectively irradiated OTS surface via a deep W lithographic procedure. The chemically patterned surface was then seeded with SK-N-SH human neuroblastoma cells, and cellular attachment and growth were monitored by optical microscopy. The use of 2-dimensional substrates supported the containment and growth of neuroblastoma cells within the pattern for at least 15 days in culture. These chemical patterns may also be useful in controlled arrangements of heart cells or muscle cells on prosthetic implant devices. C1 JOHNS HOPKINS UNIV,APPL PHYS LAB,LAUREL,MD 20703. USN,RES LAB,CTR BIOMOLEC SCI & ENGN,WASHINGTON,DC 20375. US FDA,CTR DEVICES & RADIOL HLTH,DIV PHYS SCI,ROCKVILLE,MD 20857. NR 17 TC 42 Z9 43 U1 2 U2 6 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0165-0270 J9 J NEUROSCI METH JI J. Neurosci. Methods PD NOV PY 1993 VL 50 IS 2 BP 253 EP 260 DI 10.1016/0165-0270(93)90014-I PG 8 WC Biochemical Research Methods; Neurosciences SC Biochemistry & Molecular Biology; Neurosciences & Neurology GA MK824 UT WOS:A1993MK82400014 PM 8107505 ER PT J AU YOTIS, W KEENE, J HOERMAN, K SIMONSON, LG AF YOTIS, W KEENE, J HOERMAN, K SIMONSON, LG TI FATTY-ACID PROFILES OF THE OUTER-MEMBRANE OF ATCC STRAINS 35405, 35404 AND 33521 OF TREPONEMA-DENTICOLA SO JOURNAL OF PERIODONTAL RESEARCH LA English DT Article DE FATTY ACIDS; T-DENTICOLA ATCC 35405; 35404; 33521; OUTER MEMBRANE; PERIODONTAL DISEASE ID PERIODONTITIS; HUMANS AB The fatty acid composition of the outer membrane (outer sheath) of Treponema denticola is not known. This study examined the fatty acid profiles of the outer membranes of T. denticola ATCC strains 35405, 35404, 33521. Homogeneous outer membranes were prepared from the three strains of T denticola. The fatty acids were extracted and converted to methyl esters, and their mass spectra were determined with a sensitive Hewlett-Packard 5880A-5970 gas chromatography-mass spectrometry system. Fatty acids were identified by comparing the unknown fatty acid mass spectra to computer stored known mass spectra standards. Dodecanoic, 2 hydroxy dodecanoic, tridecanoic, tetradecanoic, pentadecanoic, hexadecanoic, 2-hydroxy hexadecanoic and octadecanoic acid were found in the assay spirochetes yielding correlation indices (r) of 0.8-1.00. Isotetradecanoic acid was found in the outer membranes of strains 33521 and 35405 (r=0.913-0.967). Anteiso pentadecanoic and heptadecanoic acids were found in the outer membrane of strains 33521 and 35404 (r = 0.941-0.996), while cis 9, 12 octadecadienoic was found only in the outer sheath of strain 35405 (r = 0.922-0.958). The average concentration of dodecanoic, tridecanoic, tetradecanoic, pentadecanoic, hexadecanoic, heptadecanoic and octadecanoic acid in the outer membranes of strains 35405, 35404 and 33521 were as follows. Strain 35404: 138, 178, 845, 296, 751, not detected, and 699 nanogram per mg dry weight of the outer membrane. Strain 35404: 96, 125, 670, 306, 597, 38 and 249 nanograms per mg dry weight of the outer membrane. Strain 33521: 323, 135, 1650, 125, 9080, 235 and 618 nanograms per mg dry weight of the outer membrane. This is the first report on the fatty acid profiles of the outer membrane of strains 35405, 35404 and 33521 of T denticola. The experiments described here are in harmony with our previously reported data which suggested that the outer membrane of T denticola contains lipoproteins and lipoplysaccharide. Furthermore, this study indicates that fatty acid analysis may be used as an additional tool for the characterization of strains 35405, 35404 and 33521 of T denticola. C1 USN,DENT RES INST,GREAT LAKES,IL 60088. LOYOLA UNIV,MED CTR,DEPT PREVENT DENT,MAYWOOD,IL 60153. LOYOLA UNIV,MED CTR,DEPT MICROBIOL,MAYWOOD,IL 60153. LOYOLA UNIV,MED CTR,DEPT PERIODONT,MAYWOOD,IL 60153. NR 23 TC 7 Z9 8 U1 0 U2 1 PU MUNKSGAARD INT PUBL LTD PI COPENHAGEN PA 35 NORRE SOGADE, PO BOX 2148, DK-1016 COPENHAGEN, DENMARK SN 0022-3484 J9 J PERIODONTAL RES JI J. Periodont. Res. PD NOV PY 1993 VL 28 IS 6 BP 387 EP 395 PN 1 PG 9 WC Dentistry, Oral Surgery & Medicine SC Dentistry, Oral Surgery & Medicine GA MG590 UT WOS:A1993MG59000001 PM 8254455 ER PT J AU COHEN, ME AF COHEN, ME TI BURSTS OF PERIODONTAL DESTRUCTION AND REMISSION, PERCOLATION PHASE-SHIFTS, AND CHAOS SO JOURNAL OF PERIODONTAL RESEARCH LA English DT Article DE PERIODONTAL DISEASE; PERCOLATION; CHAOS ID ATTACHMENT LOSS; DISEASE; PROGRESSION; MECHANISMS; SYSTEMS; MODELS AB Bursts of periodontal destruction are modelled as percolation-driven phase shift events. Percolation theory, though widely used to study the flow of liquids through porous nonliving materials (e.g., soils and rocks), can be applied to bacterial or toxicological penetration of living tissue in only an approximate sense. However, it seems necessary that some mechanism, fundamentally similar to the percolation phase shift, is required to adequately account for bursts. Percolation theory is therefore offered as a framework for considering such events. A principal finding of percolation theory is the existence of percolation thresholds, such that when P, the independent probability that a subregion is susceptible to an invading substance, is above the threshold, the region will percolate or allow flow through, and when P is below the threshold the region will not percolate. This instantaneous transition, from a structure that will permit percolation to one that will not, is described as a phase shift. In addition, the value of P is postulated to depend on multiple factors which might constitute a chaotic system. The nonproportionality of a percolation phase shift and the nonpredictability of any specific chaotic event suggest that reliable burst predictors may, in theory, not be possible at the level of the individual site. RP COHEN, ME (reprint author), USN,DENT RES INST,BLDG 1-H,GREAT LAKES,IL 60088, USA. NR 36 TC 4 Z9 4 U1 0 U2 0 PU MUNKSGAARD INT PUBL LTD PI COPENHAGEN PA 35 NORRE SOGADE, PO BOX 2148, DK-1016 COPENHAGEN, DENMARK SN 0022-3484 J9 J PERIODONTAL RES JI J. Periodont. Res. PD NOV PY 1993 VL 28 IS 6 BP 429 EP 436 PN 1 PG 8 WC Dentistry, Oral Surgery & Medicine SC Dentistry, Oral Surgery & Medicine GA MG590 UT WOS:A1993MG59000006 PM 8254460 ER PT J AU STENGERSMITH, JD HENRY, RA HOOVER, JM LINDSAY, GA NADLER, MP NISSAN, RA AF STENGERSMITH, JD HENRY, RA HOOVER, JM LINDSAY, GA NADLER, MP NISSAN, RA TI MAIN-CHAIN, SYNDIOREGIC, HIGH-GLASS TRANSITION-TEMPERATURE POLYMER FOR NONLINEAR OPTICS - SYNTHESIS AND CHARACTERIZATION SO JOURNAL OF POLYMER SCIENCE PART A-POLYMER CHEMISTRY LA English DT Article DE HIGH-GLASS TRANSITION TEMPERATURE NONLINEAR OPTICAL POLYMER; SYNDIOREGIC; MAINCHAIN CHROMOPHORE; ACCORDION POLYMERS ID 2ND HARMONIC-GENERATION; 2ND-HARMONIC GENERATION; CROSS-LINKING; FILMS; DIPOLAR AB A new main-chain syndioregic (head-to-head) NLO polymer was synthesized. The glass transition temperature of high molecular weight polymer was found to be 208-degrees-C, and the polymer has minimal weight loss at temperatures to at least 250-degrees-C owing to the incorporation of hydrogen bonding moieties and rigid bridging groups. The polymer was further characterized using nuclear magnetic resonance (NMR) and Fourier transform infrared spectroscopy (FTIR). The study of the nonlinear optical properties of this polymer are in progress. (C) 1993 John Wiley & Sons, Inc. RP STENGERSMITH, JD (reprint author), USN,CTR AIR WARFARE,DIV WEAP,RES DEPT,DIV CHEM,CHINA LAKE,CA 93555, USA. NR 26 TC 32 Z9 32 U1 0 U2 0 PU JOHN WILEY & SONS INC PI NEW YORK PA 605 THIRD AVE, NEW YORK, NY 10158-0012 SN 0887-624X J9 J POLYM SCI POL CHEM JI J. Polym. Sci. Pol. Chem. PD NOV PY 1993 VL 31 IS 12 BP 2899 EP 2906 DI 10.1002/pola.1993.080311203 PG 8 WC Polymer Science SC Polymer Science GA MC588 UT WOS:A1993MC58800003 ER PT J AU LAREDO, D NETZER, DW AF LAREDO, D NETZER, DW TI THE DOMINANT EFFECT OF ALUMINA ON NEARFIELD PLUME RADIATION SO JOURNAL OF QUANTITATIVE SPECTROSCOPY & RADIATIVE TRANSFER LA English DT Article ID ROCKET; EXHAUSTS AB Solid propellant rocket motors can achieve high specific impulse with metal fuel additives such as aluminum. Combustion of aluminum produces condensed alumina particles. Besides causing performance losses in the nozzle, the condensed Al2O3 particles are the major source of primary smoke in the exhaust plume. The particulate matter can also have major effects upon the plume i.r. signature. High number densities of particles can block gas-phase radiation from the plume. They can also be the source of radiation, especially the larger particles which exit the nozzle not in thermal equilibrium with the gas. In the past, the expected effects of particle size on the plume i.r. signature have been determined almost exclusively from predictions made with flow and radiation codes. The aim of the present work was to investigate the role of the Al/Al2O3 particles from a highly loaded solid propellant (up to 16% in weight) on the plume radiation of a small rocket motor (5 cm in diameter). The spatial variation of particle size distribution was simultaneously measured with the overall radiation of a portion of the plume in the i.r. band (3.5-5.0 mu). In micro-motors, operating with highly aluminized solid propellant, the condensed particles in the near exhaust plume were the major source of radiation in the 3.5-5 mu wavelength band. Motors with longer residence time and operating at medium chamber pressures produced more particles in the micron sized range. The role of after burning was predominately confined to reheating of the alumina particles to a higher temperature, at which the condensed Al2O3 radiated more than gaseous species. Even with 30% Al2O3 in the plume, the plume of small motors can be considered as approximately conical in shape, with volume distributed radiating sources. Motor conditions producing larger particles in the plume core were thus found to increase plume radiation from that region. The overall apparent emissivity of the plume was between 0.15 and 0.25 (dominantly 0.16-0.19). Nearfield particle size distributions were tri- or quadra-modal and the farfield contained significantly fewer large particles. Thus, assumed monomodal distributions should not be expected to result in the correct prediction of the effects of particles on plume signature, nor can particle size data obtained in the farfield be expected to be applicable in the nearfield. C1 USN,POSTGRAD SCH,DEPT AERONAUT & ASTRONAUT,MONTEREY,CA 93943. NR 26 TC 10 Z9 10 U1 0 U2 5 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0022-4073 J9 J QUANT SPECTROSC RA JI J. Quant. Spectrosc. Radiat. Transf. PD NOV PY 1993 VL 50 IS 5 BP 511 EP 530 DI 10.1016/0022-4073(93)90044-I PG 20 WC Optics; Spectroscopy SC Optics; Spectroscopy GA MK109 UT WOS:A1993MK10900008 ER PT J AU MCDOUGLE, L COSGROVE, JJ AF MCDOUGLE, L COSGROVE, JJ TI THYROTOXICOSIS COMPLICATED BY ECTOPIC PREGNANCY - 1ST REPORTED CASE SO JOURNAL OF REPRODUCTIVE MEDICINE LA English DT Note AB The reported incidence of thyrotoxicosis during pregnancy ranges from 0.02% to 3.7%, with an average of 0.2%. Ectopic pregnancy occurs in 1 of 66 pregnancies in the United States. The signs and symptoms of thyrotoxicosis complicate the diagnosis and surgical management of an ectopic pregnancy. This is the first reported case of thyrotoxicosis complicated by an ectopic pregnancy. The patient presented with a surgical abdomen (in this case an ectopic pregnancy) coupled with thyrotoxicosis. The combination of prompt presurgical medical intervention and operative correction prevented the mortality associated with a ruptured tubal pregnancy and thyroid storm. C1 USN HOSP,DEPT OBSTET & GYNECOL,CAMP PENDLETON,CA. USN HOSP,DEPT FAMILY PRACTICE,CAMP PENDLETON,CA. RP MCDOUGLE, L (reprint author), USN HOSP,DEPT CLIN INVEST,SAN DIEGO,CA 92134, USA. RI McDougle, Leon/B-6935-2013 NR 7 TC 1 Z9 1 U1 0 U2 0 PU SCI PRINTERS & PUBL INC PI ST LOUIS PA P.O. DRAWER 12425 8342 OLIVE BLVD, ST LOUIS, MO 63132 SN 0024-7758 J9 J REPROD MED JI J. Reprod. Med. PD NOV PY 1993 VL 38 IS 11 BP 897 EP 899 PG 3 WC Obstetrics & Gynecology SC Obstetrics & Gynecology GA MH031 UT WOS:A1993MH03100013 PM 8277489 ER PT J AU HSIEH, T PRIOLO, FJ WARDLAW, AB AF HSIEH, T PRIOLO, FJ WARDLAW, AB TI CALCULATIONS AND COMPARISONS OF THE FLOWFIELD ABOUT AN OGIVE CYLINDER AT M=3.5 SO JOURNAL OF SPACECRAFT AND ROCKETS LA English DT Article ID SUPERSONIC FLOWS AB Laminar and turbulent Navier-Stokes and Euler calculations, with and without a separation model, were performed for a tangent-ogive cylinder. Comparisons were carried out between the predicted and measured surface pressures, and flowfield distributions of pitot pressure, static pressure, Mach number, and the total flow angle. The laminar solution was in overall best agreement with the experiment. However, an accurate turbulence transition model appears necessary to bring computations into close agreement with experiment. RP HSIEH, T (reprint author), USN,CTR SURFACE WARFARE,INFORMAT & MATH SCI BRANCH,SILVER SPRING,MD 20903, USA. NR 17 TC 1 Z9 2 U1 0 U2 0 PU AMER INST AERONAUT ASTRONAUT PI RESTON PA 1801 ALEXANDER BELL DRIVE, STE 500, RESTON, VA 22091 SN 0022-4650 J9 J SPACECRAFT ROCKETS JI J. Spacecr. Rockets PD NOV-DEC PY 1993 VL 30 IS 6 BP 665 EP 673 DI 10.2514/3.26371 PG 9 WC Engineering, Aerospace SC Engineering GA MK988 UT WOS:A1993MK98800004 ER PT J AU MOORE, FG DEVAN, L HYMER, T AF MOORE, FG DEVAN, L HYMER, T TI NEW SEMIEMPIRICAL METHOD FOR COMPUTING NONLINEAR MISSILE AERODYNAMICS SO JOURNAL OF SPACECRAFT AND ROCKETS LA English DT Article AB A new semiempirical method has been developed to predict normal force, pitching moment, and center of pressure on missile configurations up to angles of attack of 30-deg and 0-deg roll angle. The method is based on linear theory and slender body techniques at low angle of attack and uses wind-tunnel data to derive nonlinear angle-of-attack corrections as angle of attack increases. The new improved theories include body alone, wing alone, and body-wing and wing-body interference. Although the new theory is databased, simple analytical formulas are derived that allow general use of the techniques. Comparison with the linearized approaches used in the former Naval Surface Warfare Center Dahlgren Division aeroprediction code shows significant reductions in errors of aerodynamics above about 5- to 10-deg angle of attack. Limited comparisons to other state-of-the-art engineering codes show the new theory to be as good as or better than anything known to be available for computing planar aerodynamics up to 30-deg angle of attack. C1 USN,AEROMECH BRANCH,DAHLGREN,VA 22448. RP MOORE, FG (reprint author), USN,CTR SURFACE WARFARE,DEPT WRAP SYST,DAHLGREN DIV,DAHLGREN,VA 22448, USA. NR 29 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 0022-4650 J9 J SPACECRAFT ROCKETS JI J. Spacecr. Rockets PD NOV-DEC PY 1993 VL 30 IS 6 BP 696 EP 706 DI 10.2514/3.26375 PG 11 WC Engineering, Aerospace SC Engineering GA MK988 UT WOS:A1993MK98800008 ER PT J AU SAILLANT, PA SIMMONS, JA DEAR, SP AF SAILLANT, PA SIMMONS, JA DEAR, SP TI A COMPUTATIONAL MODEL OF ECHO PROCESSING AND ACOUSTIC IMAGING IN FREQUENCY-MODULATED ECHOLOCATING BATS - THE SPECTROGRAM CORRELATION AND TRANSFORMATION RECEIVER SO JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA LA English DT Article ID COMBINATION-SENSITIVE NEURONS; PTERONOTUS-P-PARNELLII; CF-FM BATS; EPTESICUS-FUSCUS; AUDITORY-CORTEX; MUSTACHED BAT; TARGET RANGE; SPECTRAL INFORMATION; CLUTTER INTERFERENCE; LATERAL LEMNISCUS AB The spectrogram correlation and transformation (SCAT) model of the sonar receiver in the big brown bat (Eptesicus fuscus) consists of a cochlear component for encoding the bat's frequency modulated (FM) sonar transmissions and multiple FM echoes in a spectrogram format, followed by two parallel pathways for processing temporal and spectral information in sonar echoes to reconstruct the absolute range and fine range structure of multiple targets from echo spectrograms. The outputs of computations taking place along these parallel pathways converge to be displayed along a computed image dimension of echo delay or target range. The resulting image depicts the location of various reflecting sources in different targets along the range axis. This series of transforms is equivalent to simultaneous, parallel forward and inverse transforms on sonar echoes, yielding the impulse responses of targets by deconvolution of the spectrograms. The performance of the model accurately reproduces the images perceived by Eptesicus in a variety of behavioral experiments on two-glint resolution in range, echo phase sensitivity, amplitude-latency trading of range estimates, dissociation of time- and frequency-domain image components, and ranging accuracy in noise. C1 OFF NAVAL RES,PERCEPTUAL SCI PROGRAM,ARLINGTON,VA 22217. RP SAILLANT, PA (reprint author), BROWN UNIV,DEPT NEUROSCI & PSYCHOL,PROVIDENCE,RI 02912, USA. FU NIMH NIH HHS [NIMH MH-00521, NIMH MH-18882, NIMH MH-19118] NR 72 TC 88 Z9 88 U1 1 U2 4 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0001-4966 J9 J ACOUST SOC AM JI J. Acoust. Soc. Am. PD NOV PY 1993 VL 94 IS 5 BP 2691 EP 2712 DI 10.1121/1.407353 PG 22 WC Acoustics; Audiology & Speech-Language Pathology SC Acoustics; Audiology & Speech-Language Pathology GA MF848 UT WOS:A1993MF84800020 PM 8270744 ER PT J AU TALMANT, M UBERALL, H MADIGOSKY, W AF TALMANT, M UBERALL, H MADIGOSKY, W TI INTERFACE WAVES ON A COMPLIANT COATING BOUNDED BY A FLUID-FLOW, AND THEIR EXCITATION BY ACOUSTIC-RESONANCE SO JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA LA English DT Article ID HYDRODYNAMIC STABILITY; INSTABILITIES; SURFACES AB The stability of interface waves on a compliant coating, attached to a rigid substrate and exposed to a laminar or turbulent fluid flow, has been the subject of several theoretical studies, and of experimental investigations in which the onset and growth of instability waves was determined. Solutions of the characteristic equation of the problem have been obtained, which furnish dispersion curves and stability information for the interface waves, assuming a compressible fluid in order to attain the correct static limit. It is shown that the excitation of these interface waves by incident inhomogeneous acoustic signals can occur in a resonant fashion. Using this approach, an accurate experimental determination of the dispersion curves, of the onset of instability, and of the growth properties of interface waves appears to be possible. C1 NSWC,WHITE OAK LAB,SILVER SPRING,MD 20903. RP TALMANT, M (reprint author), CATHOLIC UNIV AMER,DEPT PHYS,WASHINGTON,DC 20064, USA. NR 23 TC 0 Z9 0 U1 0 U2 1 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0001-4966 J9 J ACOUST SOC AM JI J. Acoust. Soc. Am. PD NOV PY 1993 VL 94 IS 5 BP 2793 EP 2798 DI 10.1121/1.407363 PG 6 WC Acoustics; Audiology & Speech-Language Pathology SC Acoustics; Audiology & Speech-Language Pathology GA MF848 UT WOS:A1993MF84800030 ER PT J AU BOURKE, RH PARSONS, AR AF BOURKE, RH PARSONS, AR TI AMBIENT NOISE CHARACTERISTICS OF THE NORTHWESTERN BARENTS SEA SO JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA LA English DT Article AB In support of the 1988-1989 CEAREX drift experiment three ANMET ambient noise buoys were inserted on ice floes in a triangular pattern approximately 120 km on a side about 200 km north of Svalbard in mid-September 1988. The buoys drifted southward passing to the east of Svalbard providing hourly measurements of the noise field from 5-4000 Hz for 2-4 months. Extensive environmental data were available with which to examine the effect of wind stress and ice motion on the noise field. The median spectra from these three buoys were quite similar with differences of about 3 dB being observed, the larger differences being at the higher frequencies where local noise effects dominate. The spectra were comparable to those found in the Eurasian Basin in winter. A 12-h periodicity was noted in both the noise and ice speed data, the result of forcing by tidal or inertial oscillations. A 52-h periodicity was noted at one buoy which lasted through the winter and was subjected to recurring synoptic scale storms. For frequencies below 100 Hz the temporal coherency was about 15 h. At low frequencies wind stress was the most important noise correlate, followed closely by ice speed. The noise field responded rapidly to the passage of storms generated by the Icelandic Low which migrated over the northern Barents Sea with the arrival of-the noise peak being associated with the time of passage of the storm front past each buoy. RP BOURKE, RH (reprint author), USN,POSTGRAD SCH,DEPT OCEANOGR,MONTEREY,CA 93943, USA. NR 26 TC 3 Z9 3 U1 1 U2 1 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0001-4966 J9 J ACOUST SOC AM JI J. Acoust. Soc. Am. PD NOV PY 1993 VL 94 IS 5 BP 2799 EP 2808 DI 10.1121/1.407372 PG 10 WC Acoustics; Audiology & Speech-Language Pathology SC Acoustics; Audiology & Speech-Language Pathology GA MF848 UT WOS:A1993MF84800031 ER PT J AU GAUNAURD, GC HUANG, H WERTMAN, W AF GAUNAURD, GC HUANG, H WERTMAN, W TI ACOUSTIC SCATTERING BY ELASTIC SPHERICAL-SHELLS THAT HAVE MULTIPLE MASSIVE INTERNAL COMPONENTS ATTACHED BY COMPLIANT MOUNTS SO JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA LA English DT Article ID SOUND SCATTERING AB A study of the scattering of sound waves by a neutrally buoyant, submerged, spherical shell that has heavy masses internally mounted by springs to the shell is presented. The presence of the attached oscillating masses substantially changes the scattering cross section of the otherwise empty shell. Furthermore, if the compliance (i.e., the spring constants) of the mounts are varied-all else being the same-then the resulting cross section also varies substantially, often by more than an order of magnitude. It is seen that if the incident plane wave impinges upon the shell at its North pole, where the masses are mounted, then the effect of the spring-mass system on the scattering response is strongest. Away from the North pole, this effect weakens; when the incidence is from the South pole, it is weakest. In general, the cross-sectional distortion produced by the attached masses consists of a set of amplitude-modulated resonance features that are computed and displayed in a number of instances. These features seem to be confined around a frequency band containing the main resonances of the (coupled) oscillator formed by the masses. The shell motions are described by the bending theory and also by the exact elasticity theory. Comparing the two, it is possible to determine the limit of validity of the bending theory, which is seen to begin to fail just below the coincidence frequency for this shell. The ''background'' contribution is separated from the ''resonance'' contribution associated with the empty shell and also from that associated with the internal oscillator. This triple split, as emerging from a shell theory, does not seem to have been investigated in the past. (Bistatic) angular plots associated with peaks/dips in the backscattering cross section and some of the isolated and symmetric ''rosettes'' observable in selected cases are displayed. This analytic model is easily reproducible and does not require any special numerical code for evaluation. RP GAUNAURD, GC (reprint author), USN,CTR SURFACE WARFARE,DAHLGREN DIV,WHITE OAK DETACHMENT,SILVER SPRING,MD 20903, USA. NR 15 TC 7 Z9 7 U1 0 U2 1 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0001-4966 J9 J ACOUST SOC AM JI J. Acoust. Soc. Am. PD NOV PY 1993 VL 94 IS 5 BP 2924 EP 2935 DI 10.1121/1.407323 PG 12 WC Acoustics; Audiology & Speech-Language Pathology SC Acoustics; Audiology & Speech-Language Pathology GA MF848 UT WOS:A1993MF84800043 ER PT J AU TURL, CW AF TURL, CW TI LOW-FREQUENCY SOUND DETECTION BY A BOTTLE-NOSED-DOLPHIN SO JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA LA English DT Letter AB The results of an underwater hearing experiment suggest that an Atlantic bottlenose dolphin (Tursiops truncatus) may detect low-frequency sound by some mechanism other than conventional hearing. At 300 and 200 Hz the dolphin's hearing threshold was similar to previously reported data. Between 50 and 150 Hz, the dolphin's response patterns to the test signal were similar to patterns shown for higher frequencies; however, after three to five reversals, the dolphin's sensitivity suddenly improved and resumed reporting signal-present trials at levels near ambient noise. Since the subject was in the near field of the acoustic source, it is suspected that the dolphin was detecting particle velocity or some combination of pressure and velocity. C1 USN COMMAND,CTR CONTROL & SURVEILLANCE,DIV NRAD,KAILUA,HI 96734. NR 13 TC 10 Z9 10 U1 0 U2 2 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0001-4966 J9 J ACOUST SOC AM JI J. Acoust. Soc. Am. PD NOV PY 1993 VL 94 IS 5 BP 3006 EP 3008 DI 10.1121/1.407333 PG 3 WC Acoustics; Audiology & Speech-Language Pathology SC Acoustics; Audiology & Speech-Language Pathology GA MF848 UT WOS:A1993MF84800053 PM 8270746 ER PT J AU REVESZ, AG BROWN, GA HUGHES, HL AF REVESZ, AG BROWN, GA HUGHES, HL TI BULK ELECTRICAL-CONDUCTION IN THE BURIED OXIDE OF SIMOX STRUCTURES SO JOURNAL OF THE ELECTROCHEMICAL SOCIETY LA English DT Article AB Buried oxide (BOX) layers in separated by implantation of oxygen (SIMOX) structures exhibit well-defined and reproducible bulk (''background'') conduction which, in contrast to localized (''defect'') conduction, is area-dependent. For annealed samples the bulk conduction is quasi-ohmic and time dependent up to approximately 80 V (for approximately 400 nm thick BOX); the temperature dependence indicates 0.3 eV as the activation energy associated with trapping effects. At higher voltage the current-voltage characteristics are superlinear and resemble those observed for deposited Si-rich SiO2 and Si(x)N(y) films, except that they depend on polarity Fowler-Nordheim plots indicate an effective barrier height of 1.3 to 1.5 eV for annealed samples and 0.4 eV for unannealed ones; this range is intermediate between 3.1 eV (thermal oxide) and 0.4 to 0.6 eV (Si-rich SiO2). Poole-Frenkel or Schottky plots (log I vs. E1/2) are similar to those reported for Si(x)N(y) films with excess silicon (x/y > 0.75). However, the temperature dependence of the high-field conduction is much less than expected for these mechanisms, indicating that the conduction is controlled by tunneling between Si clusters. From the effective barrier heights of annealed samples the size of the clusters is estimated as approximately 0.5 nm (three Si atoms) and their density as 2 x 10(19) cm-3 so that the concentration of excess silicon is at least 6 x 10(19) cm-3. For unannealed BOX the order of magnitude of excess silicon concentration is estimated as 10(21) cm-3. The polarity dependence of conduction is probably associated with the asymmetry in the distribution of excess silicon at the two interfaces. For unannealed samples the current at a given voltage is several orders of magnitude higher than for the annealed ones and the onset of the superlinear regime is at lower voltage; this behavior is similar to the localized ('' defect'') conduction exhibited by both annealed and unannealed SIMOX samples. All of the observations indicate that the BOX layers contain excess silicon; this may be in the form Of O3Si-SiO3 bonds in the oxide and/or very small silicon (probably amorphous) clusters/filaments. C1 TEXAS INSTRUMENTS INC,DALLAS,TX 75265. USN,RES LAB,WASHINGTON,DC 20375. RP REVESZ, AG (reprint author), REVESZ ASSOCIATES,BETHESDA,MD 20817, USA. NR 14 TC 25 Z9 25 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 NOV PY 1993 VL 140 IS 11 BP 3222 EP 3229 DI 10.1149/1.2221014 PG 8 WC Electrochemistry; Materials Science, Coatings & Films SC Electrochemistry; Materials Science GA MG873 UT WOS:A1993MG87300035 ER PT J AU SEARSON, PC PROKES, SM GLEMBOCKI, OJ AF SEARSON, PC PROKES, SM GLEMBOCKI, OJ TI LUMINESCENCE AT THE POROUS SILICON ELECTROLYTE INTERFACE SO JOURNAL OF THE ELECTROCHEMICAL SOCIETY LA English DT Article ID HF SOLUTIONS; PHOTOLUMINESCENCE; DISSOLUTION; MORPHOLOGY; MECHANISM AB Visible light emission in HCl from porous layers formed in n-type silicon is reported under conditions of an externally applied anodic current in HCl. Since porous layers formed in n-type silicon exhibit relatively low porosity (typically < < 50%) and large pore dimensions, the interpore regions are much larger than those required for enlargement of the bandgap. For positive current flow, the emission is transient due to the irreversible oxidation of the surf ace hydrogen layer Radiative recombination is due to electron injection from the hydrogen oxidation reaction and holes supplied by the minority carrier flux. Similar results are seen for p-type silicon suggesting that hole supply is not the rate-limiting step in the emission process, On the basis of these results, and some recent data f or visible light emission under conditions of forward bias, an energetic model f or the unoxidized porous silicon/electrolyte interface is presented. This model is consistent with a surface mechanism for emission. C1 USN,RES LAB,WASHINGTON,DC 20375. RP SEARSON, PC (reprint author), JOHNS HOPKINS UNIV,DEPT MAT SCI & ENGN,BALTIMORE,MD 21218, USA. RI Searson, Peter /A-3311-2010; OI Searson, Peter/0000-0002-5417-0828 NR 15 TC 17 Z9 17 U1 0 U2 2 PU ELECTROCHEMICAL SOC INC PI PENNINGTON PA 10 SOUTH MAIN STREET, PENNINGTON, NJ 08534 SN 0013-4651 J9 J ELECTROCHEM SOC JI J. Electrochem. Soc. PD NOV PY 1993 VL 140 IS 11 BP 3327 EP 3331 DI 10.1149/1.2221031 PG 5 WC Electrochemistry; Materials Science, Coatings & Films SC Electrochemistry; Materials Science GA MG873 UT WOS:A1993MG87300052 ER PT J AU GLEASON, TP BALSARA, Z GOFF, WB AF GLEASON, TP BALSARA, Z GOFF, WB TI SONOGRAPHIC APPEARANCE OF LEFT SPERMATIC VEIN-THROMBOSIS SIMULATING INCARCERATED INGUINAL-HERNIA SO JOURNAL OF UROLOGY LA English DT Note DE SPERMATIC CORD; THROMBOSIS; ULTRASONICS AB We report a case of exercise-induced spontaneous thrombosis of the left spermatic vein. The sonographic appearance mimicked an incarcerated left inguinal hernia by demonstrating a tubular, hypoechoic, noncompressible, cystic appearing inguinal mass with no flow evident on color Doppler imaging. C1 USN HOSP,DEPT CLIN INVEST,SAN DIEGO,CA 92134. RP GLEASON, TP (reprint author), USN HOSP,DEPT CLIN INVEST,SAN DIEGO,CA 92134, USA. NR 8 TC 4 Z9 4 U1 0 U2 0 PU WILLIAMS & WILKINS PI BALTIMORE PA 351 WEST CAMDEN ST, BALTIMORE, MD 21201-2436 SN 0022-5347 J9 J UROLOGY JI J. Urol. PD NOV PY 1993 VL 150 IS 5 BP 1513 EP 1514 PN 1 PG 2 WC Urology & Nephrology SC Urology & Nephrology GA MC576 UT WOS:A1993MC57600059 PM 8411443 ER PT J AU BROUSSARD, PR CESTONE, VC AF BROUSSARD, PR CESTONE, VC TI MODIFICATION OF THE X-RAY PHOTOEMISSION SPECTRUM OF IN-SITU DEPOSITED THIN-FILMS OF Y1BA2CU3O7-Y FOR VARIOUS OXYGEN TREATMENTS SO JOURNAL OF VACUUM SCIENCE & TECHNOLOGY A-VACUUM SURFACES AND FILMS LA English DT Article ID IDENTIFYING CHEMICAL-STATES; CURRENT-DENSITY; YBA2CU3O7-X; SPECTROSCOPY; CU; VALENCE; CORE; XPS; SUPERCONDUCTOR; VACANCIES AB We have grown thin films of the Y1Ba2Cu3O7-y superconductor onto MgO and LaGaO3 substrates by off-axis sputtering. The films were all deposited under the same conditions, but were cooled in various oxygen pressures resulting in films with superconducting transition temperatures from 85 K to nonsuperconducting. The samples have been examined by x-ray photoemission spectroscopy without exposing the samples to air. We have characterized the core levels of Y, Ba, Cu, and O and the Auger parameter of Ba, Cu, and O as a function of the oxygen pressure used during cooldown. We find that the core lines sharpen and the Auger parameter for copper reduces as the oxygen pressure is decreased. We interpret this latter result as a possible change in the valence state of copper. We also see a variation in the valence structure. RP BROUSSARD, PR (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 20 TC 5 Z9 5 U1 0 U2 0 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0734-2101 J9 J VAC SCI TECHNOL A JI J. Vac. Sci. Technol. A-Vac. Surf. Films PD NOV-DEC PY 1993 VL 11 IS 6 BP 3099 EP 3105 DI 10.1116/1.578304 PG 7 WC Materials Science, Coatings & Films; Physics, Applied SC Materials Science; Physics GA MG724 UT WOS:A1993MG72400037 ER PT J AU IDZERDA, Y AF IDZERDA, Y TI INEXPENSIVE SPOT-PROFILE ANALYSIS REFLECTION HIGH-ENERGY ELECTRON-DIFFRACTION SO JOURNAL OF VACUUM SCIENCE & TECHNOLOGY A-VACUUM SURFACES AND FILMS LA English DT Article ID SURFACES AB A simple, photomultiplier based spot-profile analysis reflection high energy electron diffraction (SPARHEED) apparatus is described. A micrometer scanned, two pinhole aperture is coupled to an optical fiber and yields 38 mum spot-profile intensity resolution of RHEED patterns corresponding to an ultimate spatial resolution of approximately 4000 angstrom along the RHEED pattern and 900 A across the RHEED pattern. Long range scanning also allows for surface lattice net determination. Acquisition of selected RHEED intensity oscillations is straightforward. The device is easily mounted, rigid, and inexpensive. RP IDZERDA, Y (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 8 TC 1 Z9 1 U1 0 U2 0 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0734-2101 J9 J VAC SCI TECHNOL A JI J. Vac. Sci. Technol. A-Vac. Surf. Films PD NOV-DEC PY 1993 VL 11 IS 6 BP 3138 EP 3140 DI 10.1116/1.578464 PG 3 WC Materials Science, Coatings & Films; Physics, Applied SC Materials Science; Physics GA MG724 UT WOS:A1993MG72400045 ER PT J AU CALVERT, JM AF CALVERT, JM TI LITHOGRAPHIC PATTERNING OF SELF-ASSEMBLED FILMS SO JOURNAL OF VACUUM SCIENCE & TECHNOLOGY B LA English DT Article; Proceedings Paper CT 37th International Symposium on Electron, Ion, and Photon Beams CY JUN 01-04, 1993 CL SAN DIEGO, CA SP AMER VACUUM SOC, IEEE, ELECTRON DEVICE SOC, OPT SOC AMER ID COPLANAR MOLECULAR ASSEMBLIES; DEEP UV PHOTOCHEMISTRY; MONOLAYER FILMS; CELL-ADHESION AB This article discusses a new, general approach for fabricating surfaces with precise positional control of chemical functionalities utilizing direct patterning of self-assembled (SA) organosilane monolayer films with lithographic exposure tools, including deep ultraviolet, x-ray, and e-beam sources. Lithographically patterned one- and two-component SA films have been used to selectively deposit or attach a wide variety of materials to surfaces, including catalysts, electroless metal films, proteins, cells, and organic moieties. Selectively metallized, patterned SA films have been employed to fabricate functioning Si metal-oxide-semiconductor field effect transistor test structures. The utility of patterned SA films for microelectronics, sensors, and other applications is discussed. RP CALVERT, JM (reprint author), USN,RES LAB,CTR BIOMOLEC SCI & ENGN,CODE 6900,WASHINGTON,DC 20375, USA. NR 35 TC 88 Z9 89 U1 0 U2 10 PU A V S AMER INST PHYSICS PI MELVILLE PA STE 1 NO 1, 2 HUNTINGTON QUADRANGLE, MELVILLE, NY 11747-4502 USA SN 1071-1023 J9 J VAC SCI TECHNOL B JI J. Vac. Sci. Technol. B PD NOV-DEC PY 1993 VL 11 IS 6 BP 2155 EP 2163 DI 10.1116/1.586449 PG 9 WC Engineering, Electrical & Electronic; Nanoscience & Nanotechnology; Physics, Applied SC Engineering; Science & Technology - Other Topics; Physics GA MM972 UT WOS:A1993MM97200035 ER PT J AU PERKINS, FK DOBISZ, EA MARRIAN, CRK AF PERKINS, FK DOBISZ, EA MARRIAN, CRK TI DETERMINATION OF ACID DIFFUSION RATE IN A CHEMICALLY AMPLIFIED RESIST WITH SCANNING TUNNELING MICROSCOPE LITHOGRAPHY SO JOURNAL OF VACUUM SCIENCE & TECHNOLOGY B LA English DT Article; Proceedings Paper CT 37th International Symposium on Electron, Ion, and Photon Beams CY JUN 01-04, 1993 CL SAN DIEGO, CA SP AMER VACUUM SOC, IEEE, ELECTRON DEVICE SOC, OPT SOC AMER ID ELECTRON-SCATTERING; SYSTEMS AB A scanning tunneling microscope (STM) was employed to investigate properties of the chemically amplified negative electron beam resist MICROPOSIT(R) SAL-601(R), from Shipley Company. The usual processing sequence of the resist includes a postexposure bake (PEB) to promote the cross-linking action of the acid catalyst. However, it has been proposed that PEB can induce thermally activated diffusion of the acid catalyst as well. Using the STM to generate a spatially localized beam of low kinetic energy electrons, we have investigated the effects of exposure dose and voltage and PEB time on linewidth in thin (50 nm) resist films. Even with no PEB, insoluble resist features were observable. Energy calculations do not support significant local heating. Therefore, cross-linking must be due to.the electron exposure. Dose and PEB times under 10 min have only a small effect on linewidth. From the variation of feature size with PEB time, an upper limit to the diffusion coefficient was measured to be 0.3 nm2/s. This value is well below what has been previously reported. The process latitude of exposure with a 50 kV electron beam has also been investigated. Both dose and PEB conditions had a much larger effect on feature size for the high energy lithography. RP PERKINS, FK (reprint author), USN,RES LAB,CODE 6864,WASHINGTON,DC 20375, USA. NR 28 TC 21 Z9 21 U1 0 U2 1 PU A V S AMER INST PHYSICS PI MELVILLE PA STE 1 NO 1, 2 HUNTINGTON QUADRANGLE, MELVILLE, NY 11747-4502 USA SN 1071-1023 J9 J VAC SCI TECHNOL B JI J. Vac. Sci. Technol. B PD NOV-DEC PY 1993 VL 11 IS 6 BP 2597 EP 2602 DI 10.1116/1.586632 PG 6 WC Engineering, Electrical & Electronic; Nanoscience & Nanotechnology; Physics, Applied SC Engineering; Science & Technology - Other Topics; Physics GA MM972 UT WOS:A1993MM97200122 ER PT J AU DOBISZ, EA MARRIAN, CRK SALVINO, RE ANCONA, MA PERKINS, FK TURNER, NH AF DOBISZ, EA MARRIAN, CRK SALVINO, RE ANCONA, MA PERKINS, FK TURNER, NH TI REDUCTION AND ELIMINATION OF PROXIMITY EFFECTS SO JOURNAL OF VACUUM SCIENCE & TECHNOLOGY B LA English DT Article; Proceedings Paper CT 37th International Symposium on Electron, Ion, and Photon Beams CY JUN 01-04, 1993 CL SAN DIEGO, CA SP AMER VACUUM SOC, IEEE, ELECTRON DEVICE SOC, OPT SOC AMER ID ELECTRON-BEAM LITHOGRAPHY; SCANNING TUNNELING MICROSCOPE; SYSTEMS; RESIST AB The physical processes limiting resolution and causing proximity effects in electron-beam lithography (EBL) are outlined, with the major emphasis on sub-250 nm lithography. A reduction of proximity effects and the enhancement of resolution in the resist can be achieved with a thin intermediate layer (such as 50-300 nm of silicon nitride or silicon dioxide) between the resist and the substrate. This has been observed on a number of substrate's (Si, GaAs, W, and InSb) and with two high-resolution e-beam resists. Monte Carlo simulations and experimental results show that secondary electrons play a key role in the understanding of this phenomenon. Furthermore, a large number of fast secondaries (500 eV-3 keV), emitted from substrate-resist interface, enter the resist within a approximately 100 nm radius of the primary beam. The thin intermediate layers reduce the number of secondary electrons entering the resist. In contrast, the elimination of proximity effects was observed with very low energy electron beams (< 100 eV) as can be formed by a scanning tunneling microscope (STM), operated in the field emission mode. STM lithography gives a highly localized exposure, which results in very high resist resolution over a wide process latitude. The elements of an implementation of very low voltage EBL are outlined. C1 USN,RES LAB,DIV CHEM,WASHINGTON,DC 20375. RP DOBISZ, EA (reprint author), USN,RES LAB,DIV ELECTR SCI & TECHNOL,WASHINGTON,DC 20375, USA. NR 31 TC 32 Z9 32 U1 0 U2 3 PU A V S AMER INST PHYSICS PI MELVILLE PA STE 1 NO 1, 2 HUNTINGTON QUADRANGLE, MELVILLE, NY 11747-4502 USA SN 1071-1023 J9 J VAC SCI TECHNOL B JI J. Vac. Sci. Technol. B PD NOV-DEC PY 1993 VL 11 IS 6 BP 2733 EP 2740 DI 10.1116/1.586593 PG 8 WC Engineering, Electrical & Electronic; Nanoscience & Nanotechnology; Physics, Applied SC Engineering; Science & Technology - Other Topics; Physics GA MM972 UT WOS:A1993MM97200148 ER PT J AU SUH, D SIMONS, JK TAYLOR, JW KOLOSKI, TS CALVERT, JM AF SUH, D SIMONS, JK TAYLOR, JW KOLOSKI, TS CALVERT, JM TI SOFT-X-RAY PHOTOCHEMISTRY OF CHEMISORBED SELF-ASSEMBLED MONOLAYERS SO JOURNAL OF VACUUM SCIENCE & TECHNOLOGY B LA English DT Article; Proceedings Paper CT 37th International Symposium on Electron, Ion, and Photon Beams CY JUN 01-04, 1993 CL SAN DIEGO, CA SP AMER VACUUM SOC, IEEE, ELECTRON DEVICE SOC, OPT SOC AMER ID LITHOGRAPHY; ELECTRONS AB The first results of the effect of monochromatic soft x-ray exposure of self-assembled monolayers (SAMs) of iodomethylphenylsilyl groups chemisorbed on the native oxide surface of a Si substrate are presented. The SAMs, combined with a subsequent selective metallization process, have already been shown to be an effective resist system for projection x-ray lithography and show great promise as an e-beam resist. The first conclusive evidence is presented for the loss of iodine from the SAM during soft x-ray exposure. The loss of iodine in the exposed areas allows the selective deposition of an etch resistant metal in the unexposed areas. The SAMs also provide a model system for the study of resists at the molecular level, and the role of photogenerated electrons in determining sensitivity and resolution. The concentration of iodine left on the surface during monochromatic exposure was monitored using photoemission. The loss of iodine with exposure was then fit with a double exponential. The photon energy dependence of the decay rates are measured and presented for photon energies 75-108 eV. The SAM sensitivity is shown to correlate with photoelectrons generated from the Si native oxide surface. C1 UNIV WISCONSIN,CTR SYNCHROTRON RADIAT,MADISON,WI 53589. USN,RES LAB,CTR BIOMOLEC SCI & ENGN,WASHINGTON,DC 20375. RP SUH, D (reprint author), UNIV WISCONSIN,CTR XRAY LITHOG,MADISON,WI 53589, USA. NR 21 TC 25 Z9 25 U1 1 U2 3 PU A V S AMER INST PHYSICS PI MELVILLE PA STE 1 NO 1, 2 HUNTINGTON QUADRANGLE, MELVILLE, NY 11747-4502 USA SN 1071-1023 J9 J VAC SCI TECHNOL B JI J. Vac. Sci. Technol. B PD NOV-DEC PY 1993 VL 11 IS 6 BP 2850 EP 2854 DI 10.1116/1.586614 PG 5 WC Engineering, Electrical & Electronic; Nanoscience & Nanotechnology; Physics, Applied SC Engineering; Science & Technology - Other Topics; Physics GA MM972 UT WOS:A1993MM97200168 ER PT J AU MCCORMICK, ME AF MCCORMICK, ME TI EQUILIBRIUM SHORELINE RESPONSE TO BREAKWATERS SO JOURNAL OF WATERWAY PORT COASTAL AND OCEAN ENGINEERING-ASCE LA English DT Article AB An empirical analysis of the shoreline response to both single and multiple detached breakwaters is presented. In the analysis, equilibrium conditions are assumed. The analysis is based, in part, on previously published experimental data, which are also the basis of a previous study of equilibrium shoreline response to breakwaters. The current analysis differs from the previous analysis in several ways; (1) The effects of wave steepness and beach slope are included; (2) waves are allowed to approach from any direction in deep water; and (3) the effects of segmented breakwaters can be analyzed. Neither analysis includes the effects of grain size. The current analysis can be used to predict the formation of tombolos and salients, and to predict the maximum shoreline retreat or shoreline advance. To demonstrate the utility of the analysis, the shoreline response to the 11-unit breakwater system at Bay Ridge, Md., is predicted. The predicted and actual shorelines are shown to be in good agreement. RP MCCORMICK, ME (reprint author), USN ACAD,NAOME STOP 11D,ANNAPOLIS,MD 21402, USA. NR 14 TC 25 Z9 29 U1 1 U2 2 PU ASCE-AMER SOC CIVIL ENGINEERS PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2398 SN 0733-950X J9 J WATERW PORT C-ASCE JI J. Waterw. Port Coast. Ocean Eng.-ASCE PD NOV-DEC PY 1993 VL 119 IS 6 BP 657 EP 670 DI 10.1061/(ASCE)0733-950X(1993)119:6(657) PG 14 WC Engineering, Civil; Engineering, Ocean; Water Resources SC Engineering; Water Resources GA MD133 UT WOS:A1993MD13300005 ER PT J AU GREFENSTETTE, JJ AF GREFENSTETTE, JJ TI SPECIAL ISSUE ON GENETIC ALGORITHMS - INTRODUCTION SO MACHINE LEARNING LA English DT Editorial Material RP GREFENSTETTE, JJ (reprint author), USN,RES LAB,NAVY CTR APPL RES AI,WASHINGTON,DC 20375, USA. NR 12 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 0885-6125 J9 MACH LEARN JI Mach. Learn. PD NOV-DEC PY 1993 VL 13 IS 2-3 BP 157 EP 160 DI 10.1023/A:1022665828579 PG 4 WC Computer Science, Artificial Intelligence SC Computer Science GA MH149 UT WOS:A1993MH14900001 ER PT J AU DEJONG, KA SPEARS, WM GORDON, DF AF DEJONG, KA SPEARS, WM GORDON, DF TI USING GENETIC ALGORITHMS FOR CONCEPT-LEARNING SO MACHINE LEARNING LA English DT Article DE CONCEPT LEARNING; GENETIC ALGORITHMS; BIAS ADJUSTMENT AB In this article, we explore the use of genetic algorithms (GAs) as a key element in the design and implementation of robust concept learning systems. We describe and evaluate a GA-based system called GABIL that continually learns and refines concept classification rules from its interaction with the environment. The use of GAs is motivated by recent studies showing the effects of various forms of bias built into different concept learning systems, resulting in systems that perform well on certain concept classes (generally, those well matched to the biases) and poorly on others. By incorporating a GA as the underlying adaptive search mechanism, we are able to construct a concept learning system that has a simple, unified architecture with several important features. First, the system is surprisingly robust even with minimal bias. Second, the system can be easily extended to incorporate traditional forms of bias found in other concept learning systems. Finally, the architecture of the system encourages explicit representation of such biases and, as a result, provides for an important additional feature: the ability to dynamically adjust system bias. The viability of this approach is illustrated by comparing the performance of GABIL with that of four other more traditional concept learners (AQ14, C4.5, ID5R, and IACL) on a variety of target concepts. We conclude with some observations about the merits of this approach and about possible extensions. C1 USN,RES LAB,WASHINGTON,DC 20375. RP DEJONG, KA (reprint author), GEORGE MASON UNIV,DEPT COMP SCI,FAIRFAX,VA 22030, USA. NR 31 TC 187 Z9 190 U1 0 U2 4 PU KLUWER ACADEMIC PUBL PI DORDRECHT PA SPUIBOULEVARD 50, PO BOX 17, 3300 AA DORDRECHT, NETHERLANDS SN 0885-6125 J9 MACH LEARN JI Mach. Learn. PD NOV-DEC PY 1993 VL 13 IS 2-3 BP 161 EP 188 DI 10.1023/A:1022617912649 PG 28 WC Computer Science, Artificial Intelligence SC Computer Science GA MH149 UT WOS:A1993MH14900002 ER PT J AU MITRA, S MCNELLEY, TR AF MITRA, S MCNELLEY, TR TI TEMPERATURE-DEPENDENCE OF STRAIN-HARDENING IN A DISPERSION-STRENGTHENED AL-FE-V-SI ALLOY SO METALLURGICAL TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE LA English DT Note ID MECHANICAL-PROPERTIES; ALUMINUM-ALLOYS; DEFORMATION; DUCTILITY RP MITRA, S (reprint author), USN,POSTGRAD SCH,DEPT MECH ENGN,MAT SCI SECT,MONTEREY,CA 93943, USA. NR 28 TC 14 Z9 15 U1 0 U2 0 PU MINERALS METALS MATERIALS SOC PI WARRENDALE PA 420 COMMONWEALTH DR, WARRENDALE, PA 15086 SN 0360-2133 J9 METALL TRANS A PD NOV PY 1993 VL 24 IS 11 BP 2589 EP 2593 DI 10.1007/BF02646539 PG 5 WC Materials Science, Multidisciplinary SC Materials Science GA MF556 UT WOS:A1993MF55600024 ER PT J AU HYAMS, KC BOURGEOIS, AL ESCAMILLA, J BURANS, J WOODY, JN AF HYAMS, KC BOURGEOIS, AL ESCAMILLA, J BURANS, J WOODY, JN TI THE NAVY FORWARD LABORATORY DURING OPERATIONS DESERT SHIELD DESERT-STORM SO MILITARY MEDICINE LA English DT Article AB The Navy Forward Laboratory (NFL) was an advanced infectious disease laboratory which provided a theater-wide reference diagnostic capability during Operations Desert Shield/Storm. During Operation Desert Shield, when massive numbers of troops were being deployed, the NFL primarily supported medical personnel in the diagnosis and treatment of infectious diseases. During the war, the laboratory provided rapid biologic warfare diagnostic support. The NFL demonstrated the benefits of a comprehensive, on-site diagnostic laboratory when large numbers of troops are deployed to high-risk areas and demonstrated the importance of military medical research laboratories for training of scientists and physicians, threat assessment, and product development. RP HYAMS, KC (reprint author), USN,MED RES INST,BETHESDA,MD 20814, USA. NR 0 TC 12 Z9 12 U1 0 U2 0 PU ASSN MILITARY SURG US PI BETHESDA PA 9320 OLD GEORGETOWN RD, BETHESDA, MD 20814 SN 0026-4075 J9 MIL MED JI Milit. Med. PD NOV PY 1993 VL 158 IS 11 BP 729 EP 732 PG 4 WC Medicine, General & Internal SC General & Internal Medicine GA MH568 UT WOS:A1993MH56800015 PM 8284062 ER PT J AU HARMS, DE MADALA, RV RAMAN, S SASHEGYI, KD AF HARMS, DE MADALA, RV RAMAN, S SASHEGYI, KD TI DIABATIC INITIALIZATION TESTS USING THE NAVAL RESEARCH LABORATORY LIMITED-AREA NUMERICAL WEATHER PREDICTION MODEL SO MONTHLY WEATHER REVIEW LA English DT Note ID SATELLITE DATA; PARAMETERIZATION; SPECIFICATION AB Diabatic forcing has been incorporated into a nonlinear normal-mode initialization scheme to provide more realistic initial conditions and to alleviate the problem of the spinup time of the Naval Research Laboratory Limited-Area Numerical Weather Prediction Model. Latent heating profiles are computed from the observed rainfall and from the model-generated convective rainfall at locations where there were no observations. The latent heating is distributed in the vertical according to the cumulus convective parameterization scheme (Kuo scheme) of the model. The results of a case study from the Genesis of Atlantic Lows Experiment indicated that model spinup of forecast rainfall can be reduced when diabatic initialization with merging of heat and/or rain is used. C1 N CAROLINA STATE UNIV,COLL PHYS & MATH SCI,DEPT MARINE EARTH & ATMOSPHER SCI,BOX 8208,RALEIGH,NC 27695. USN,RES LAB,WASHINGTON,DC 20375. NR 29 TC 5 Z9 7 U1 0 U2 0 PU AMER METEOROLOGICAL SOC PI BOSTON PA 45 BEACON ST, BOSTON, MA 02108-3693 SN 0027-0644 J9 MON WEATHER REV JI Mon. Weather Rev. PD NOV PY 1993 VL 121 IS 11 BP 3184 EP 3190 DI 10.1175/1520-0493(1993)121<3184:DITUTN>2.0.CO;2 PG 7 WC Meteorology & Atmospheric Sciences SC Meteorology & Atmospheric Sciences GA MD412 UT WOS:A1993MD41200013 ER PT J AU GOLDA, EM PORPORA, GA AF GOLDA, EM PORPORA, GA TI UTILIZING RESERVE ASSETS - MUTUAL SUPPORT AT SUPSHIP BATH SO NAVAL ENGINEERS JOURNAL LA English DT Article RP GOLDA, EM (reprint author), USN,CTR SURFACE WARFARE,DIV CARDEROCK,ANNAPOLIS DETACHMENT,ANNAPOLIS,MD, USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER SOC NAVAL ENG INC PI ALEXANDRIA PA 1452 DUKE STREET, ALEXANDRIA, VA 22314-3458 SN 0028-1425 J9 NAV ENG J JI Nav. Eng. J. PD NOV PY 1993 VL 105 IS 6 BP 39 EP 42 PG 4 WC Engineering, Marine; Engineering, Civil; Oceanography SC Engineering; Oceanography GA MH660 UT WOS:A1993MH66000002 ER PT J AU HOLDEN, RA AF HOLDEN, RA TI COMBAT SYSTEM ENGINEERING FOR THE DDG-51 CLASS AND FUTURE SURFACE COMBATANTS SO NAVAL ENGINEERS JOURNAL LA English DT Article AB Constraints imposed on future surface combatant acquisition will demand both design-to-capability and design-to-cost. The future Navy must be affordable and, to go in harm's way, must be combat capable. The quality of future ships depends on establishing an acquisition process that ensures capability independent of the rate of ship construction or the missions of the fleet. This paper explores surface combatant acquisition strategy and the engineering process that supports it. Events that shaped the combat system portion of the DDG-51 shipbuilding program are reviewed as a basis to propose a modification to the process of future acquisitions. A historical perspective is established by outlining the shipbuilding program as it evolved from about 1978 to 1989. Factors that shaped the eventual upgrade program are presented in terms of the acquisition strategy and system engineering, which led to definition of the combat system configurations. Conclusions based on the information presented suggest that a more efficient system engineering process is needed to execute future preplanned upgrades and to support long-term plans. This process is described in terms of a single research and development funding line for configuration definition, design, and development. This approach differs from the traditional ship design, acquisition, and construction process in terms of continuity of system development and emphasis on interdependencies of the combat system and ship. RP HOLDEN, RA (reprint author), USN,CTR SURFACE WARFARE,DAHLGREN DIV,AEGIS SHIP COMBAT SYST DIV,DAHLGREN,VA 22448, USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER SOC NAVAL ENG INC PI ALEXANDRIA PA 1452 DUKE STREET, ALEXANDRIA, VA 22314-3458 SN 0028-1425 J9 NAV ENG J JI Nav. Eng. J. PD NOV PY 1993 VL 105 IS 6 BP 43 EP 52 PG 10 WC Engineering, Marine; Engineering, Civil; Oceanography SC Engineering; Oceanography GA MH660 UT WOS:A1993MH66000003 ER PT J AU KIRKSHARIAN, A AF KIRKSHARIAN, A TI A NAVY CALS IMPLEMENTATION OF AN ELECTRONIC PRODUCT DATA CAPTURE AND TRANSLATION SYSTEM SO NAVAL ENGINEERS JOURNAL LA English DT Article AB This paper describes the development of a system to capture and provide computer-aided acquisition and logistics support (CALS) compliant product data of printed wiring assemblies. The Navy's Rapid Acquisition of Manufactured Parts (RAMP) Program has fostered the demonstration and use of product data standards which include EDIF, IPC-350, IGES, and CCITT Group 4 Raster. A comprehensive approach is outlined for the design and manufacturing use of electronic product data. This approach lays the foundation for the unified product data modeling efforts espoused for PDES/STEP. In conjunction with this outline, the development of a computer-aided design (CAD) system is described for the practical capture of existing technical data. A computer-aided engineering (CAE) capability exists to enhance or augment inadequate existing data. RP KIRKSHARIAN, A (reprint author), USN,SUPPLY SYST COMMAND,RAMP RES & DEV PROJECT,WASHINGTON,DC, USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER SOC NAVAL ENG INC PI ALEXANDRIA PA 1452 DUKE STREET, ALEXANDRIA, VA 22314-3458 SN 0028-1425 J9 NAV ENG J JI Nav. Eng. J. PD NOV PY 1993 VL 105 IS 6 BP 53 EP 58 PG 6 WC Engineering, Marine; Engineering, Civil; Oceanography SC Engineering; Oceanography GA MH660 UT WOS:A1993MH66000004 ER PT J AU FAWLEY, WM LASLETT, LJ CELATA, CM FALTENS, A HABER, I AF FAWLEY, WM LASLETT, LJ CELATA, CM FALTENS, A HABER, I TI SIMULATION STUDIES OF SPACE-CHARGE-DOMINATED BEAM TRANSPORT IN LARGE-APERTURE RATIO QUADRUPOLES SO NUOVO CIMENTO DELLA SOCIETA ITALIANA DI FISICA A-NUCLEI PARTICLES AND FIELDS LA English DT Article AB For many cases of interest in the design of heavy-ion fusion accelerators, the maximum transportable current in a magnetic-quadrupole lattice scales as (a/L)(2), where a is the useful dynamic aperture and L is the half-lattice period. There are many cost benefits in maximizing the usable aperture which must be balanced against unwanted effects such as possible emittance growth and particle loss from anharmonic fringe fields. We have used two independent simulation codes to model space-charge-dominated beam transport both in an azimuthally pure quadrupole FODO lattice design and in a more conventional design. Our results indicate that careful matching will be necessary to minimize emittance growth and that (a/L) ratios of 0.2 or larger are possible for particular parameters. C1 USN, RES LAB, WASHINGTON, DC 20375 USA. RP FAWLEY, WM (reprint author), UNIV CALIF BERKELEY, LAWRENCE BERKELEY LAB, BERKELEY, CA 94720 USA. NR 3 TC 1 Z9 1 U1 0 U2 0 PU EDITRICE COMPOSITORI BOLOGNA PI BOLOGNA PA VIA STALINGRADO 97/2, I-40128 BOLOGNA, ITALY SN 1124-1861 J9 NUOVO CIMENTO A JI Nuovo Cimento Soc. Ital. Fis. A-Nucl. Part. Fields PD NOV PY 1993 VL 106 IS 11 BP 1637 EP 1642 DI 10.1007/BF02821261 PG 6 WC Physics, Particles & Fields SC Physics GA MT970 UT WOS:A1993MT97000024 ER PT J AU FRIEDMAN, A CALLAHAN, DA GROTE, DP HABER, I LANGDON, AB LUND, SM AF FRIEDMAN, A CALLAHAN, DA GROTE, DP HABER, I LANGDON, AB LUND, SM TI WHAT WE HAVE LEARNED FROM 3D AND R, Z INTENSE-BEAM SIMULATIONS USING THE WARP CODE SO NUOVO CIMENTO DELLA SOCIETA ITALIANA DI FISICA A-NUCLEI PARTICLES AND FIELDS LA English DT Article ID FUSION AB A multi-dimensional discrete-particle simulation code, WARP, and its application to heavy-ion fusion beams is described. The code's 3D package combines features of an accelerator code and a particle-in-cell plasma simulation, and can efficiently track beams through many lattice elements and around bends. The code's r, z package allows one to follow beams over very long times and models the accelerating module impedances. A number of applications are presented. These have led to an improved understanding of: beam equilibria, and the approach to equilibrium; longitudinal beam dynamics and stability; electrostatic: quadrupole (ESQ) injector aberrations; bending and recirculation of space-charge-dominated beams; and the drift-compression process. The code is being used for accelerator design, as well as for theoretical investigations. C1 USN, RES LAB, WASHINGTON, DC 20375 USA. RP FRIEDMAN, A (reprint author), LAWRENCE LIVERMORE NATL LAB, POB 5508, L-440, LIVERMORE, CA 94550 USA. NR 16 TC 3 Z9 3 U1 1 U2 1 PU EDITRICE COMPOSITORI BOLOGNA PI BOLOGNA PA VIA STALINGRADO 97/2, I-40128 BOLOGNA, ITALY SN 1124-1861 J9 NUOVO CIMENTO A JI Nuovo Cimento Soc. Ital. Fis. A-Nucl. Part. Fields PD NOV PY 1993 VL 106 IS 11 BP 1649 EP 1655 DI 10.1007/BF02821263 PG 7 WC Physics, Particles & Fields SC Physics GA MT970 UT WOS:A1993MT97000026 ER PT J AU OLSON, CL HINSHELWOOD, DD HUBBARD, RF LAMPE, M NERI, JM OTTINGER, PF POUKEY, JW ROSE, DV SLINKER, SP STEPHANAKIS, SJ WELCH, DR YOUNG, FC AF OLSON, CL HINSHELWOOD, DD HUBBARD, RF LAMPE, M NERI, JM OTTINGER, PF POUKEY, JW ROSE, DV SLINKER, SP STEPHANAKIS, SJ WELCH, DR YOUNG, FC TI PHYSICS OF GAS-BREAKDOWN FOR ION-BEAM TRANSPORT IN GAS SO NUOVO CIMENTO DELLA SOCIETA ITALIANA DI FISICA A-NUCLEI PARTICLES AND FIELDS LA English DT Article ID INTENSE AB Detailed analysis, experiments, and computer simulations are producing a new understanding of gas breakdown during intense ion beam transport in neutral gas. Charge neutralization of beam micro clumps is shown to limit the net clump potentals to a non-zero value phi(min), which can lead to divergence growth and axial energy spreading. At pressures greater than or equal to 1 Torr, plasma shielding should substantially reduce this effect. Current neutralization has been studied in experiments on the GAMBLE II accelerator. The importance of fast electrons (knock-ons and runaways) has been established in IPROP simulations, which are in agreement with the experiments. For light-ion fusion parameters with pressures greater than or equal to 1 Torr, very small net current fractions (<<1%) appear feasible, permitting ballistic transport in gas. Self-pinched transport requires higher net current fractions (greater than or equal to 2%) and preliminary IPROP code results indicate that this appears achievable for small-radius intense beams in lower-pressure gases (less than or equal to 1 Torr). Several self-pinched transport concepts look promising. The importance of these results for both light-ion fusion and heavy-ion fusion is discussed. C1 JAYCOR INC, VIENNA, VA 22182 USA. USN, RES LAB, WASHINGTON, DC 20375 USA. MISSION RES CORP, ALBUQUERQUE, NM 87106 USA. RP OLSON, CL (reprint author), SANDIA NATL LABS, ALBUQUERQUE, NM 87185 USA. NR 12 TC 2 Z9 2 U1 0 U2 2 PU EDITRICE COMPOSITORI BOLOGNA PI BOLOGNA PA VIA STALINGRADO 97/2, I-40128 BOLOGNA, ITALY SN 1124-1861 J9 NUOVO CIMENTO A JI Nuovo Cimento Soc. Ital. Fis. A-Nucl. Part. Fields PD NOV PY 1993 VL 106 IS 11 BP 1705 EP 1711 DI 10.1007/BF02821270 PG 7 WC Physics, Particles & Fields SC Physics GA MT970 UT WOS:A1993MT97000033 ER PT J AU WANG, DX WANG, JG KEHNE, D REISER, M HABER, I AF WANG, DX WANG, JG KEHNE, D REISER, M HABER, I TI LONGITUDINAL EXPANSION AND COMPRESSION OF ELECTRON BUNCHES WITH RECTANGULAR LINE CHARGE PROFILES SO NUOVO CIMENTO DELLA SOCIETA ITALIANA DI FISICA A-NUCLEI PARTICLES AND FIELDS LA English DT Article AB The longitudinal expansion and compression of a space-charge-dominated rectangular electron bunch have been investigated at the University of Maryland Electron Beam Transport Facility. In this paper we report the experimental results and comparison with theoretical prediction and 1D PIC simulations. C1 USN, RES LAB, WASHINGTON, DC 20375 USA. RP WANG, DX (reprint author), UNIV MARYLAND, PLASMA RES LAB, COLL PK, MD 20742 USA. NR 5 TC 4 Z9 4 U1 0 U2 1 PU EDITRICE COMPOSITORI BOLOGNA PI BOLOGNA PA VIA STALINGRADO 97/2, I-40128 BOLOGNA, ITALY SN 1124-1861 J9 NUOVO CIMENTO A JI Nuovo Cimento Soc. Ital. Fis. A-Nucl. Part. Fields PD NOV PY 1993 VL 106 IS 11 BP 1739 EP 1743 DI 10.1007/BF02821275 PG 5 WC Physics, Particles & Fields SC Physics GA MT970 UT WOS:A1993MT97000038 ER PT J AU TRIETSCH, D BAKER, KR AF TRIETSCH, D BAKER, KR TI BASIC TECHNIQUES FOR LOT STREAMING SO OPERATIONS RESEARCH LA English DT Article ID SHOP AB We present an overview of basic models and solution algorithms for the lot streaming problem. We include models with continuous and discrete sublet sizes, models with and without intermittent idling of machines, and models with consistent and variable sublets. We also introduce a model with limited transporter capacity. First we present solutions for two machines, then generalize to three machines and, where possible, to several machines. We synthesize previous research and introduce several new results. C1 USN,POSTGRAD SCH,MONTEREY,CA. DARTMOUTH COLL,AMOS TUCK SCH BUSINESS ADM,HANOVER,NH 03755. NR 12 TC 92 Z9 100 U1 0 U2 5 PU OPERATIONS RESEARCH SOC AMER PI LINTHICUM HTS PA 901 ELKRIDGE LANDING RD, STE 400, LINTHICUM HTS, MD 21090-2920 SN 0030-364X J9 OPER RES JI Oper. Res. PD NOV-DEC PY 1993 VL 41 IS 6 BP 1065 EP 1076 DI 10.1287/opre.41.6.1065 PG 12 WC Management; Operations Research & Management Science SC Business & Economics; Operations Research & Management Science GA MR003 UT WOS:A1993MR00300006 ER PT J AU AUBORN, JE FULLER, JM MCCAULEY, HM AF AUBORN, JE FULLER, JM MCCAULEY, HM TI TARGET DETECTION BY COOCCURRENCE MATRIX SEGMENTATION AND ITS HARDWARE IMPLEMENTATION SO OPTICAL ENGINEERING LA English DT Article DE ACQUISITION; TRACKING; POINTING; TARGET DETECTION; CC-OCCURRENCE MATRIX; SEGMENTATION AB A number of acquisition, tracking, and classification algorithms have been developed to deal with various image processing problems in the laboratory. Typically, these algorithms are too complicated to implement in a low-cost, real-time processor. Using image data in many real-time applications requires a system with very high data rates, low power dissipation, and a small packaging volume. We developed a processor architecture suitable for these applications, and adapted and demonstrated a co-occurrence matrix target detection algorithm in computer simulation and real-time hardware. A histogram, or gray-level distribution, is often used to select a threshold for image segmentation. This technique is often inadequate because the histograms tend to be noisy and exhibit many small peaks. Co-occurrence matrix-based segmentation allows homogeneous regions of an image to be identified and separated from a cluttered background. Results are shown for target segmentation using representative infrared imagery and real-time hardware. RP AUBORN, JE (reprint author), USN,AIR WARFARE CTR WEAP DIV,DIV ADV SYST,DEPT ATTACK WEAP,CHINA LAKE,CA 93555, USA. NR 3 TC 1 Z9 1 U1 0 U2 0 PU SOC PHOTO-OPT INSTRUM ENG PI BELLINGHAM PA PO BOX 10, BELLINGHAM, WA 98227-0010 SN 0091-3286 J9 OPT ENG JI Opt. Eng. PD NOV PY 1993 VL 32 IS 11 BP 2698 EP 2702 DI 10.1117/12.148105 PG 5 WC Optics SC Optics GA MG773 UT WOS:A1993MG77300009 ER PT J AU CARTER, WH AF CARTER, WH TI ON SOME DIFFRACTION EFFICIENCY EQUATIONS FOR A THICK GRATING OR HOLOGRAM SO OPTICS COMMUNICATIONS LA English DT Article ID SCATTERING AB It is shown that the diffraction efficiency relations for a thick sinusoidal grating can be calculated using just conventional, linear scattering theory in the first Born approximation to obtain the coupling relations between plane waves in the grating, and simple rate equations to account for the multiple scattering phenomena. The results of this analysis agree with the conventional coupled wave analysis based on Raman-Nath theory. RP CARTER, WH (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 19 TC 1 Z9 1 U1 0 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0030-4018 J9 OPT COMMUN JI Opt. Commun. PD NOV 1 PY 1993 VL 103 IS 1-2 BP 1 EP 7 DI 10.1016/0030-4018(93)90633-G PG 7 WC Optics SC Optics GA MC695 UT WOS:A1993MC69500001 ER PT J AU BAJUSCAK, RE HALL, EH GIAMBARRESI, LI WEAVER, T AF BAJUSCAK, RE HALL, EH GIAMBARRESI, LI WEAVER, T TI BACTERIAL-CONTAMINATION OF DENTAL RADIOGRAPHIC FILM SO ORAL SURGERY ORAL MEDICINE ORAL PATHOLOGY ORAL RADIOLOGY AND ENDODONTICS LA English DT Article AB Three types of paper-covered and one type of plastic-covered Kodak dental film were used to determine if bacteria could penetrate the coverings and contaminate the inner film. Films from each group were immersed for 30 or 120 seconds in high concentrations of known bacterial suspensions with or without 10% sterilized calf serum added to the incubation media. The plastic-covered film effectively excluded all bacteria, whereas the paper-covered film showed contamination with all organisms even at 30 seconds. Increasing the viscosity of the incubation medium with calf serum decreased the level of contamination. C1 USN,NATL NAVAL DENT CTR,SCH DENT,DEPT ORAL MED,8901 WISCONSIN AVE,BETHESDA,MD 20889. USN,CTR DENT,DEPT ORAL MED,HONOLULU,HI. NATL NAVAL DENT CTR,RES DEPT,BETHESDA,MD. NR 15 TC 2 Z9 2 U1 0 U2 0 PU MOSBY-YEAR BOOK INC PI ST LOUIS PA 11830 WESTLINE INDUSTRIAL DR, ST LOUIS, MO 63146-3318 SN 1079-2104 J9 ORAL SURG ORAL MED O JI Oral Surg. Oral Med. Oral Pathol. Oral Radiol. Endod. PD NOV PY 1993 VL 76 IS 5 BP 661 EP 663 DI 10.1016/0030-4220(93)90078-I PG 3 WC Dentistry, Oral Surgery & Medicine SC Dentistry, Oral Surgery & Medicine GA MH155 UT WOS:A1993MH15500020 PM 8247509 ER PT J AU MCGEE, TM DIAZORDAZ, EA KARTUSH, JM AF MCGEE, TM DIAZORDAZ, EA KARTUSH, JM TI THE ROLE OF KTP LASER IN REVISION STAPEDECTOMY SO OTOLARYNGOLOGY-HEAD AND NECK SURGERY LA English DT Article ID SURGERY; OTOSCLEROSIS; STAPEDOTOMY AB In recent years, the safety and efficacy of revision stapedectomy has come under scrutiny. Experienced surgeons report that the results of such surgery are often worse than the results after primary surgery and that the risks of sensorineural hearing loss, tinnitus, and vertigo are increased. With the addition of laser technology to revision stapes surgery, the procedure to open the neomembrane over the oval window and gain access to the inner ear can now be performed safely. This allows positive identification of the oval window and assures placement of the prosthesis through the fenestra rather than on an intermediate segment of scar or bone in the region of the footplate. Out studies have shown the laser to be an important tool that enhances the safety and efficacy of revision stapedectomy. C1 MICHIGAN EAR INST,FARMINGTON HILLS,MI. USN HOSP,DEPT OTOLARYNGOL HEAD & NECK SURG,PORTSMOUTH,VA. NR 17 TC 32 Z9 32 U1 0 U2 0 PU MOSBY-YEAR BOOK INC PI ST LOUIS PA 11830 WESTLINE INDUSTRIAL DR, ST LOUIS, MO 63146-3318 SN 0194-5998 J9 OTOLARYNG HEAD NECK JI Otolaryngol. Head Neck Surg. PD NOV PY 1993 VL 109 IS 5 BP 839 EP 843 PG 5 WC Otorhinolaryngology; Surgery SC Otorhinolaryngology; Surgery GA MJ891 UT WOS:A1993MJ89100010 PM 8247562 ER PT J AU KRISHNAMURTHY, S IYENGAR, SS HOLYER, R LYBANON, M AF KRISHNAMURTHY, S IYENGAR, SS HOLYER, R LYBANON, M TI TOPOGRAPHIC-BASED FEATURE LABELING FOR INFRARED OCEANOGRAPHIC IMAGES SO PATTERN RECOGNITION LETTERS LA English DT Article DE OCEANIC FEATURES; EDGE DETECTION; RELAXATION; FEATURE LABELING, FEATURE EXTRACTION; IMAGE INTERPRETATION; FACET MODEL; DIRECTIONAL DERIVATIVE AB A general computational framework is proposed to address the problem of labeling oceanographic images. The essential ideas stem from fitting a bicubic polynomial to each pixel's neighborhood and assigning topological labels based on the first and second directional derivatives of the polynomial surface. The topographic approach has been successfully applied by numerous previous investigators to other problems. The motivation of our work is to build a complete autonomous and self-contained module that segments and labels oceanographic images. In this paper, the relationship between the oceanographic features in infrared satellite imagery and the topographic structures is presented. Algorithms are developed that demonstrate the ability to locate and identify the North and South Walls of the Gulf Stream and to find approximate centers of warm and cold eddies. Experimental results on detecting these oceanographic features are provided. C1 LOUISIANA STATE UNIV,DEPT COMP SCI,BATON ROUGE,LA 70803. USN,RES LAB,REMOTE SENSING BRANCH,BAY ST LOUIS,MS 39529. NR 31 TC 4 Z9 4 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0167-8655 J9 PATTERN RECOGN LETT JI Pattern Recognit. Lett. PD NOV PY 1993 VL 14 IS 11 BP 915 EP 925 DI 10.1016/0167-8655(93)90156-8 PG 11 WC Computer Science, Artificial Intelligence SC Computer Science GA MH173 UT WOS:A1993MH17300010 ER PT J AU ALLEN, PB FELDMAN, JL AF ALLEN, PB FELDMAN, JL TI THERMAL-CONDUCTIVITY OF DISORDERED HARMONIC SOLIDS SO PHYSICAL REVIEW B LA English DT Article ID CRYSTALS AB As a crystal is disordered, a point may be reached where the typical mean free path of phonons is so short that the wavelength and mean free path are no longer sharp concepts, and the textbook phonongas model for thermal conductivity breaks down. This paper proposes an alternate theory for the disordered regime, and the subsequent paper implements the theory for a realistic model of amorphous silicon. The idea is that the dominant scattering is correctly described by a harmonic Hamiltonian, which is, in principle, transformable into a one-body problem of decoupled oscillators. From this the thermal conductivity can be exactly calculated by an analog of the Kubo-Greenwood formula for electrical conductivity of disordered metals. Anderson localization is correctly contained in this theory; localized states contribute no currents in harmonic approximation. What is required is an atomistic model with a large unit cell and periodic boundary conditions (to avoid undesired surface effects). The linear size of the model should be larger than the mean free paths of the dominant phonons. A Kubo formula and then a Kubo-Greenwood-type formula are derived for this problem. A ''mode diffusivity'' D(i) for the ith exact oscillator state is defined. The heat is carried by off-diagonal elements of the heat current operator, which have a nonzero contribution because the temperature gradient introduces nonzero offdiagonal elements of the density matrix [a(i)(dagger)a(j)]. An effort is made to interpret these results physically. Schemes for implementing this formalism are discussed. C1 USN, RES LAB, COMPLEX SYST THEORY BRANCH, WASHINGTON, DC 20375 USA. RP SUNY STONY BROOK, DEPT PHYS, STONY BROOK, NY 11794 USA. RI Allen, Philip/A-4366-2008 NR 30 TC 199 Z9 201 U1 3 U2 38 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 NOV 1 PY 1993 VL 48 IS 17 BP 12581 EP 12588 DI 10.1103/PhysRevB.48.12581 PG 8 WC Physics, Condensed Matter SC Physics GA MF901 UT WOS:A1993MF90100023 ER PT J AU FELDMAN, JL KLUGE, MD ALLEN, PB WOOTEN, F AF FELDMAN, JL KLUGE, MD ALLEN, PB WOOTEN, F TI THERMAL-CONDUCTIVITY AND LOCALIZATION IN GLASSES - NUMERICAL STUDY OF A MODEL OF AMORPHOUS-SILICON SO PHYSICAL REVIEW B LA English DT Article ID MOLECULAR-DYNAMICS; VIBRATIONAL-SPECTRUM; COMPUTER-SIMULATION; LOW-TEMPERATURES; SI; HEAT; GERMANIUM; SOLIDS; GENERATION; POTENTIALS AB Numerical calculations of thermal conductivity kappa(T) are reported for realistic atomic structure models of amorphous silicon with 1000 atoms and periodic boundary conditions. Using Stillinger-Weber forces, the vibrational eigenstates are computed by exact diagonalization in harmonic approximation. Only the uppermost 3% of the states are localized. The finite size of the system prevents accurate information about low-energy vibrations, but the 98% of the modes with energies above 10 meV are densely enough represented to permit a lot of information to be extracted. Each harmonic mode has an intrinsic (harmonic) diffusivity defined by the Kubo formula, which we can accurately calculate for omega > 10 meV. If the mode could be assigned a wave vector k and a velocity v = partial derivative omega/partial derivative k, then Boltzmann theory assigns a diffusivity D(k) = 1/3vl, where l is the mean free path. We find that we cannot define a wave vector for the majority of the states, but the intrinsic harmonic diffusivity is still well-defined and has a numerical value similar to what one gets by using the Boltzmann result, replacing v by a sound velocity and replacing l by an interatomic distance a. This appears to justify the notion of a minimum thermal conductivity as discussed by Kittel, Slack, and others. In order to fit the experimental kappa(T) it is necessary to add a Debye-like continuation from 10 meV down to 0 meV. The harmonic diffusivity becomes a Rayleigh omega-4 law and gives a divergent kappa(T) as T-->0. To eliminate this we make the standard assumption of resonant-plus-relaxational absorption from two-level systems (this is an anharmonic effect which would lie outside our model even if it did contain two-level systems implicitly). A reasonable fit and explanation then results for the behavior of kappa(T) in all temperature regimes. We also study the effect of increasing the harmonic disorder by substitutional mass defects (modeling amorphous Si/Ge alloys). The additional disorder increases the fraction of localized states, but delocalized states still dominate. However, the diffusivity of the delocalized states is diminished, weakening our faith in any literal interpretation of the minimum conductivity idea. C1 SUNY STONY BROOK,DEPT PHYS,STONY BROOK,NY 11794. UNIV CALIF DAVIS,DEPT APPL SCI,LIVERMORE,CA 94550. RP FELDMAN, JL (reprint author), USN,RES LAB,COMPLEX SYST THEORY BRANCH,WASHINGTON,DC 20375, USA. RI Allen, Philip/A-4366-2008 NR 48 TC 164 Z9 164 U1 2 U2 19 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD NOV 1 PY 1993 VL 48 IS 17 BP 12589 EP 12602 DI 10.1103/PhysRevB.48.12589 PG 14 WC Physics, Condensed Matter SC Physics GA MF901 UT WOS:A1993MF90100024 ER PT J AU NGAI, KL AF NGAI, KL TI ANALYSIS OF NMR AND CONDUCTIVITY-RELAXATION MEASUREMENTS IN GLASSY LI2S-SIS2 FAST-ION CONDUCTORS SO PHYSICAL REVIEW B LA English DT Article ID NUCLEAR-MAGNETIC-RESONANCE; SPIN RELAXATION; MODEL; DIFFUSION AB Li-7 nuclear spin-lattice relaxation (NSR) and Li-ion electrical-conductivity relaxation (ECR) data of (Li2S)0.56(SiS2)0.44, a glassy fast-ionic conductor, have been reanalyzed. Both NSR and ECR data are fitted by using a stretched exponential, exp[-(t/tau*)beta], for the correlation function in each relaxation. It is found that tau(s)* for NSR can be several orders of magnitude longer than tau(sigma)* for ECR at the same temperature, beta(s) and beta(sigma) are not the same with beta(s) < beta(sigma), and the activation energy E(s)* of tau(s)* is significantly larger than E(sigma)* of tau(sigma)*. In this contribution we show how these pronounced differences of the parameters in the correlation functions of NSR and ECR are explained in the framework of the coupling model. An additional predicted relation:beta(s)E(s)* = beta(sigma)E(sigma)* is found to be consistent with the experimental data and the common value of the two products is identified naturally with the true single ion activation energy. The constraints that these experimental data impose on any viable theory of the dynamics of carriers in glassy ionic conductors are discussed. RP NGAI, KL (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 32 TC 88 Z9 90 U1 0 U2 12 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD NOV 1 PY 1993 VL 48 IS 18 BP 13481 EP 13485 DI 10.1103/PhysRevB.48.13481 PG 5 WC Physics, Condensed Matter SC Physics GA MF903 UT WOS:A1993MF90300032 ER PT J AU SHEN, CY AF SHEN, CY TI HEAT-SALT FINGER FLUXES ACROSS A DENSITY INTERFACE SO PHYSICS OF FLUIDS A-FLUID DYNAMICS LA English DT Article AB The heat and salt fluxes produced by salt fingering at a density interface are studied with a numerical and an analytical model. Specifically, the issue concerning the value of the heat-to-salt flux ratio is addressed. The numerical modeling based on direct numerical computation of the nonlinear governing equations obtains values around 0.5. This value is approximately the average of widely varying experimental values reported in the literature. The large difference between the theoretical flux ratio predicted based on the buoyancy maximization hypothesis and the experimentally derived flux ratio is examined with an analytical model, which includes both effects of salt stratification in the interface and salt discontinuity at the edges of the interface. Combined with the numerical model results, the analysis shows that the disagreement can be traced to the flux maximization hypothesis itself. An alternative hypothesis that maximizes convective velocity amplitude is presented which gives flux-ratio predictions consistent with the measurements. Discussion of the finger width scale and the magnitude of the salt flux is also given as well as comparison of the salt flux with laboratory measurements. RP SHEN, CY (reprint author), USN,RES LAB,CODE 7340,WASHINGTON,DC 20375, USA. NR 19 TC 15 Z9 15 U1 0 U2 0 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0899-8213 J9 PHYS FLUIDS A-FLUID PD NOV PY 1993 VL 5 IS 11 BP 2633 EP 2643 DI 10.1063/1.858727 PG 11 WC Mechanics; Physics, Fluids & Plasmas SC Mechanics; Physics GA MD642 UT WOS:A1993MD64200008 ER PT J AU UHM, HS CHEN, CP AF UHM, HS CHEN, CP TI NONLINEAR-ANALYSIS OF THE 2-STREAM INSTABILITY FOR RELATIVISTIC ANNULAR ELECTRON-BEAMS SO PHYSICS OF FLUIDS B-PLASMA PHYSICS LA English DT Article AB A nonlinear theory is developed for the two-stream interaction of two relativistic annular electron beams propagating through a grounded cylindrical conducting tube. The theory is based on the assumption that the beams experience energy modulation at a cavity before they enter the drift tube. Two coupled integrodifferential equations are derived which describe beam current modulation in terms of time t and propagation distance z. The evolution of the fundamental mode in the current modulation is investigated analytically by making use of these coupled equations. The amplitude of the fundamental mode, which is a function of the propagation distance, is expressed explicitly in terms of the initial energy modulation, the growth mte of the instability, and the beam intensity. It is found that self-field effects dominate two-stream effects at the beginning of the propagation. As the beams propagate further, the two-stream effects start to dominate and then the perturbations grow exponentially. The saturation mechanism is identified as multimode coupling. A theoretical model describing the mode coupling in the current modulation is also developed. The theory is verified by detailed comparisons between analytical and particle-in-cell simulation results. C1 MIT,CTR PLASMA FUS,CAMBRIDGE,MA 02139. RP UHM, HS (reprint author), USN,CTR SURFACE WARFARE,10901 NEW HAMPSHIRE AVE,SILVER SPRING,MD 20903, USA. NR 8 TC 9 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 NOV PY 1993 VL 5 IS 11 BP 4180 EP 4190 DI 10.1063/1.860963 PG 11 WC Physics, Fluids & Plasmas SC Physics GA MF931 UT WOS:A1993MF93100037 ER PT J AU BUOT, FA AF BUOT, FA TI MESOSCOPIC PHYSICS AND NANOELECTRONICS - NANOSCIENCE AND NANOTECHNOLOGY SO PHYSICS REPORTS-REVIEW SECTION OF PHYSICS LETTERS LA English DT Review ID RESONANT-TUNNELING STRUCTURES; HOT-ELECTRON TRANSISTORS; NEGATIVE DIFFERENTIAL RESISTANCE; CURRENT-VOLTAGE CHARACTERISTICS; QUANTUM-WELL HETEROSTRUCTURES; DIMENSIONAL 2-BAND MODEL; INTRINSIC BISTABILITY; EDGE STATES; SEMICONDUCTOR NANOSTRUCTURES; NUMERICAL-SIMULATION AB A coherent overview of the exciting field and challenging areas of research in mesoscopic physics and nanoelectronics is given. The unifying role of the S-matrix theory or ''input-quantum process-output'' language of quantum mechanics in the formulation of quantum transport in mesoscopic physics and nanoelectronics is clarified, with time-independent S-matrix theory applied to mesoscopic systems and double-time-axis time-dependent S-matrix theory, coupled with the lattice Weyl-Wigner formulation of quantum dynamics of electrons in solids, applied to the highly nonlinear, far-from-equilibrium and high-speed nanoelectronic devices. At steady state and near equilibrium, the two independent formulations yield equivalent results. The technological impact of the many-body quantum distribution-function (QDF) (typified by the Wigner distribution function) approach is demonstrated by a complete transition from the level of basic nonlinear quantum transport physics to an engineering computer-aided design tool for integrated circuits (ICs). This is done in the derivation of the equivalent circuit model for resonant tunneling devices which incorporates the quantum inductance. In this review, emphasis is given to major developments in quantum transport, computational nanoelectronics, new device concepts, and novel transport physical phenomena found in small structures, with potential device and IC applications and deemed most likely to have a significant impact on the future developments of nanoelectronics. RP USN, RES LAB, WASHINGTON, DC 20375 USA. NR 181 TC 148 Z9 171 U1 2 U2 43 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0370-1573 EI 1873-6270 J9 PHYS REP JI Phys. Rep.-Rev. Sec. Phys. Lett. PD NOV PY 1993 VL 234 IS 2-3 BP 73 EP 174 DI 10.1016/0370-1573(93)90097-W PG 102 WC Physics, Multidisciplinary SC Physics GA MH323 UT WOS:A1993MH32300001 ER PT J AU GONZALEZ, RA MEANS, TS MEHAY, SL AF GONZALEZ, RA MEANS, TS MEHAY, SL TI EMPIRICAL TESTS OF THE SAMUELSONIAN PUBLICNESS PARAMETER - HAS THE RIGHT HYPOTHESIS BEEN TESTED SO PUBLIC CHOICE LA English DT Article ID GOODS; MUNICIPALITIES; EXPENDITURES; DEMAND; VOTER C1 USN,POSTGRAD SCH,DEPT ADM SCI,MONTEREY,CA 93943. RP GONZALEZ, RA (reprint author), SAN JOSE STATE UNIV,DEPT ECON,SAN JOSE,CA 95192, USA. NR 17 TC 9 Z9 9 U1 2 U2 6 PU KLUWER ACADEMIC PUBL PI DORDRECHT PA SPUIBOULEVARD 50, PO BOX 17, 3300 AA DORDRECHT, NETHERLANDS SN 0048-5829 J9 PUBLIC CHOICE JI Public Choice PD NOV PY 1993 VL 77 IS 3 BP 523 EP 534 DI 10.1007/BF01047858 PG 12 WC Economics; Political Science SC Business & Economics; Government & Law GA ME453 UT WOS:A1993ME45300003 ER PT J AU REILLY, MH AF REILLY, MH TI THIN-PHASE SCREEN ESTIMATES OF TID EFFECTS ON MIDLATITUDE TRANSIONOSPHERIC RADIO PATHS SO RADIO SCIENCE LA English DT Article ID ATMOSPHERIC GRAVITY-WAVES; RADIOTELESCOPE; ARRAY AB The thin-phase screen model for ionospheric irregularity perturbations to-transionospheric radio propagation is redefined. It is argued that the phase screen normal should be along the line of sight (LOS) between a receiver on the ground and a space transmitter, rather than in the zenith direction at the point of intersection with the LOS, which is traditional. The model is applied to a calculation of TID strength thresholds for the occurrence of multipath and scintillation. The results are in sharp disagreement with the traditional model, which predicts thresholds lower by an order of magnitude in typical cases. Midlatitude observations of TID strengths are reviewed, and it is found that multipath thresholds can be exceeded under one or more favorable circumstances, which include frequencies below about 100 MHz, low elevation angles, winter, night, atmospheric gravity wave velocity near the magnetic field direction and away from parallel with the LOS, and low solar activity. RP REILLY, MH (reprint author), USN,RES LAB,NAVAL SPACE TECHNOL CTR,CODE 8340,WASHINGTON,DC 20375, USA. NR 18 TC 0 Z9 3 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 NOV-DEC PY 1993 VL 28 IS 6 BP 979 EP 986 DI 10.1029/93RS01651 PG 8 WC Astronomy & Astrophysics; Geochemistry & Geophysics; Meteorology & Atmospheric Sciences; Remote Sensing; Telecommunications SC Astronomy & Astrophysics; Geochemistry & Geophysics; Meteorology & Atmospheric Sciences; Remote Sensing; Telecommunications GA ML354 UT WOS:A1993ML35400003 ER PT J AU BARRY, RG SERREZE, MC MASLANIK, JA PRELLER, RH AF BARRY, RG SERREZE, MC MASLANIK, JA PRELLER, RH TI THE ARCTIC SEA-ICE CLIMATE SYSTEM - OBSERVATIONS AND MODELING SO REVIEWS OF GEOPHYSICS LA English DT Review ID NORTHERN NORTH-ATLANTIC; OCEAN COUPLED MODEL; LARGE-SCALE HEAT; THICKNESS DISTRIBUTION; FRAM STRAIT; ALBEDO PARAMETERIZATION; SEASONAL-VARIATIONS; CANADA BASIN; THERMODYNAMIC MODEL; THERMAL-RADIATION AB Significant advances are being made in our understanding of the Arctic sea ice-climate system. The mean circulation of the Arctic sea ice cover is now well defined through analysis of data from drifting stations and buoys. Analysis of nearly 20 years of daily satellite data from optical, infrared, and passive microwave sensors has documented the regional variability in monthly ice extent, concentration, and surface albedo. Advances in modeling include better treatments of sea ice dynamics and thermodynamics, improved atmosphere-ice-ocean coupling, and the development of high resolution regional models. Diagnostic studies of monthly and interannual sea ice variability have benefited from better sea ice data and geostrophic wind analyses that incorporate drifting buoy data. Some evidence exists for a small retreat of Arctic sea ice over the last 2 decades, but there are large decadal fluctuations in regional ice extent. Antiphase relationships between ice anomalies in different sectors can be related to changes in atmospheric circulation. Evidence suggests that episodes of significant salinity reduction in the North Atlantic, associated with extensive sea ice in the Greenland Sea, may be a manifestation of a decadal oscillation in the Arctic climate system. Aspects of the Arctic system in need of further attention include the surface energy budget and its variability, particularly with respect to the roles of cloud cover and surface types in summer. Sea ice thickness distribution data remain meager, and there are many unknowns regarding the circulation and hydrologic cycle of the Arctic Ocean and its links to the world ocean. Planned measurements from a new generation of satellites, supported by field programs, will provide much needed data to address these issues. C1 UNIV COLORADO,DEPT GEOG,BOULDER,CO 80309. USN,OCEANOG & ATMOSPHER RES LAB,BAY ST LOUIS,MS. RP BARRY, RG (reprint author), UNIV COLORADO,COOPERAT INST RES ENVIRONM SCI,DIV CRYOSPHER & POLAR PROC,BOULDER,CO 80309, USA. OI Barry, Roger/0000-0001-9239-0859 NR 202 TC 109 Z9 121 U1 2 U2 12 PU AMER GEOPHYSICAL UNION PI WASHINGTON PA 2000 FLORIDA AVE NW, WASHINGTON, DC 20009 SN 8755-1209 J9 REV GEOPHYS JI Rev. Geophys. PD NOV PY 1993 VL 31 IS 4 BP 397 EP 422 DI 10.1029/93RG01998 PG 26 WC Geochemistry & Geophysics SC Geochemistry & Geophysics GA MJ762 UT WOS:A1993MJ76200002 ER PT J AU NGAI, KL ROLAND, CM YEE, AF AF NGAI, KL ROLAND, CM YEE, AF TI A CONSTRAINT DYNAMICS APPROACH TO RUBBER ELASTICITY SO RUBBER CHEMISTRY AND TECHNOLOGY LA English DT Article ID POLYMER MELTS; NETWORK DISENTANGLEMENT; AMBIENT-TEMPERATURE; UNIAXIAL EXTENSION; CHAIN DYNAMICS; FLUCTUATIONS; RELAXATION; POLYCARBONATE; DEFORMATION; RECOVERY AB The coupling model of relaxation is applied to crosslinked rubber, with a connection drawn between the dynamics of network junctions and statistical mechanics derived rubber elasticity theory. The suggestion that unifying concepts must underlie dynamical models and thermodynamic theories is shown to be supported by analyses of recent P-31 NMR spectroscopy measurements by Shi, Dickinson, MacKnight and Chien1 on polytetrahydrofuran networks and of our mechanical relaxation data on stretched and unstretched polycarbonate. C1 UNIV MICHIGAN,DEPT MAT SCI & ENGN,ANN ARBOR,MI 48109. RP NGAI, KL (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. RI Yee, Albert/E-5398-2010 OI Yee, Albert/0000-0002-5762-6042 NR 38 TC 29 Z9 29 U1 0 U2 2 PU AMER CHEMICAL SOC INC PI AKRON PA RUBBER DIV UNIV AKRON PO BOX 499, AKRON, OH 44309-0499 SN 0035-9475 J9 RUBBER CHEM TECHNOL JI Rubber Chem. Technol. PD NOV-DEC PY 1993 VL 66 IS 5 BP 817 EP 826 DI 10.5254/1.3538346 PG 10 WC Polymer Science SC Polymer Science GA MP589 UT WOS:A1993MP58900009 ER PT J AU SCHULZRINNE, CW COLLINS, JP GLAZ, HM AF SCHULZRINNE, CW COLLINS, JP GLAZ, HM TI NUMERICAL-SOLUTION OF THE RIEMANN PROBLEM FOR 2-DIMENSIONAL GAS-DYNAMICS SO SIAM JOURNAL ON SCIENTIFIC COMPUTING LA English DT Article DE RIEMANN PROBLEM; GAS DYNAMICS; GODUNOV METHOD; WAVE INTERACTION ID DIMENSIONS AB The Riemann problem for two-dimensional gas dynamics with isentropic or polytropic gas is considered. The initial data is constant in each quadrant and chosen so that only a rarefaction wave, shock wave, or slip line connects two neighboring constant initial states. With this restriction sixteen (respectively, fifteen) genuinely different wave combinations for isentropic (respectively, polytropic) gas exist. For each configuration the numerical solution is analyzed and illustrated by contour plots. Additionally, the required relations for the initial data and the symmetry properties of the solutions are given. The chosen calculations correspond closely to the cases studied by T. Zhang and Y. Zheng [SIAM J. Math.Anal., 21 (1990), pp. 593-630], so that the analytical theory can be directly compared to our numerical study. C1 USN,CTR SURFACE WARFARE,INFORMAT & MATH SCI BRANCH,WHITE OAK,SILVER SPRING,MD 20903. UNIV MARYLAND,DEPT MATH,COLL PK,MD 20742. RP SCHULZRINNE, CW (reprint author), SWISS FED INST TECHNOL,SEMINAR ANGEW MATH,CH-8092 ZURICH,SWITZERLAND. NR 20 TC 153 Z9 154 U1 1 U2 6 PU SIAM PUBLICATIONS PI PHILADELPHIA PA 3600 UNIV CITY SCIENCE CENTER, PHILADELPHIA, PA 19104-2688 SN 1064-8275 J9 SIAM J SCI COMPUT JI SIAM J. Sci. Comput. PD NOV PY 1993 VL 14 IS 6 BP 1394 EP 1414 DI 10.1137/0914082 PG 21 WC Mathematics, Applied SC Mathematics GA MF348 UT WOS:A1993MF34800008 ER PT J AU LUCKE, RL AF LUCKE, RL TI NYQUIST RECONSTRUCTION AS THE LIMIT OF TRIGONOMETRIC INTERPOLATION SO SIGNAL PROCESSING LA English DT Article DE RECONSTRUCTION; INTERPOLATION AB The Nyquist reconstruction formula can be obtained by taking the limiting form of trigonometric interpolation for a large number of data points. The usefulness of trigonometric interpolators is demonstrated by showing that they can extend good interpolation performance to lower data sampling rates than can standard polynomial interpolators. RP LUCKE, RL (reprint author), USN,RES LAB,CODE 7604,WASHINGTON,DC 20375, USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0165-1684 J9 SIGNAL PROCESS JI Signal Process. PD NOV PY 1993 VL 34 IS 2 BP 223 EP 230 DI 10.1016/0165-1684(93)90164-6 PG 8 WC Engineering, Electrical & Electronic SC Engineering GA MT981 UT WOS:A1993MT98100007 ER PT J AU MALLEY, JD HORNSTEIN, J AF MALLEY, JD HORNSTEIN, J TI QUANTUM-STATISTICAL INFERENCE SO STATISTICAL SCIENCE LA English DT Article DE QUANTUM MECHANICS; HEISENBERG UNCERTAINTY; JOINT DISTRIBUTION; HILBERT SPACE; SELF-ADJOINT OPERATOR; SPECTRAL MEASURE; PROBABILITY-OPERATOR MEASURE; DECISION THEORY; BAYESIAN INFERENCE; DEFINETTI REPRESENTATION THEOREM; CRAMER-RAO INEQUALITY ID PHASE MEASUREMENT; COHERENT STATES; COMMUNICATION; INFORMATION AB The three main points of this article are: 1. Quantum mechanical data differ from conventional data: for example, joint distributions usually cannot be defined conventionally; 2. rigorous methods have been developed for analyzing such data; the methods often use quantum-consistent analogs of classical statistical procedures; 3. with these procedures, statisticians, both data-analytic and more theoretically oriented, can become active participants in many new and emerging areas of science and biotechnology. In the physical realm described by quantum mechanics, many conventional statistical and probabilistic assumptions no longer hold. Probabilistic ideas are central to quantum theory but the standard Kolmogorov axioms are not uniformly applicable. Studying such phenomena requires an altered model for sample spaces, for random variables and for inference and decision making. The appropriate decision theory has been in development since the mid-1960s. It is both mathematically and statistically rigorous and conforms to the requirements of the known physical results. This article provides a tour of the structure and current applications of quantum-consistent statistical inference and decision theory. It presents examples, outlines the theory and considers applications and open problems. Certain central concepts of quantum theory are more clearly apprehended in terms of the quantum-consistent statistical decision theory. For example, the Heisenberg uncertainty principle can be obtained as a consequence of the quantum version of the Cramer-Rao inequality. This places concepts of statistical estimation and decision theory, and thus the statistician, at the center of the quantum measurement process. Quantum statistical inference offers considerable scope for participation by the statistical community, in both applications and foundational questions. C1 USN, RES LAB, REMOTE SENSING PHYS BRANCH, WASHINGTON, DC 20375 USA. RP NIH, DIV COMP RES & TECHNOL, DISTRIBUTED SYST BRANCH, BLDG 12A, ROOM 3053, BETHESDA, MD 20892 USA. NR 75 TC 27 Z9 27 U1 0 U2 3 PU INST MATHEMATICAL STATISTICS PI CLEVELAND PA 3163 SOMERSET DR, CLEVELAND, OH 44122 USA SN 0883-4237 J9 STAT SCI JI Stat. Sci. PD NOV PY 1993 VL 8 IS 4 BP 433 EP 457 DI 10.1214/ss/1177010787 PG 25 WC Statistics & Probability SC Mathematics GA MM367 UT WOS:A1993MM36700015 ER PT J AU KOSTOFF, RN AF KOSTOFF, RN TI SEMIQUANTITATIVE METHODS FOR RESEARCH IMPACT ASSESSMENT SO TECHNOLOGICAL FORECASTING AND SOCIAL CHANGE LA English DT Article AB Three types of semiquantitative methods used by the federal government in research impact assessment are presented. These include the classic retrospective method (Project Hindsight), another retrospective approach (Project TRACES and follow-ons), and accomplishments books used by selected research-sponsoring organizations (Office of Naval Research, Air Force Office of Scientific Research, Department of Energy Office of Health and Environmental Research, Department of Energy High Energy Physics Program, Defense Advanced Research Projects Agency). The strengths and weaknesses of each approach are discussed. One goal of all the studies presented was to identify the products of research and some of their impacts. In addition, the Hindsight, TRACES, and DARPA studies tried to identify factors that influenced the productivity and impact of research. The following general conclusions about the role and impact of basic research were reached: 1. The majority of basic research events that directly impacted technologies or systems were non-mission-oriented and occurred many decades before the technology or system emerged. 2. The cumulative indirect impacts of basic research were not accounted for by any of the retrospective approaches published. 3. An advanced pool of knowledge must be developed in many fields before synthesis leading to an innovation can occur. 4. Allocation of benefits among researchers, organizations, and funding agencies to determine economic returns from basic research is very difficult and arbitrary, especially at the micro level. RP KOSTOFF, RN (reprint author), USN, OFF NAVAL RES, 800 N QUINCY ST, ARLINGTON, VA 22217 USA. NR 41 TC 13 Z9 13 U1 1 U2 6 PU ELSEVIER SCIENCE INC PI NEW YORK PA 655 AVENUE OF THE AMERICAS, NEW YORK, NY 10010 SN 0040-1625 J9 TECHNOL FORECAST SOC JI Technol. Forecast. Soc. Chang. PD NOV PY 1993 VL 44 IS 3 BP 231 EP 244 DI 10.1016/0040-1625(93)90070-N PG 14 WC Business; Planning & Development SC Business & Economics; Public Administration GA MC614 UT WOS:A1993MC61400001 ER PT J AU NG, J HURLEY, CK BAXTERLOWE, LA CHOPEK, M COPPO, PA HEGLAND, J KUKURUGA, D MONOS, D ROSNER, G SCHMECKPEPER, B YANG, SY DUPONT, B HARTZMAN, RJ AF NG, J HURLEY, CK BAXTERLOWE, LA CHOPEK, M COPPO, PA HEGLAND, J KUKURUGA, D MONOS, D ROSNER, G SCHMECKPEPER, B YANG, SY DUPONT, B HARTZMAN, RJ TI LARGE-SCALE OLIGONUCLEOTIDE TYPING FOR HLA-DRB1/3/4 AND HLA-DQB1 IS HIGHLY ACCURATE, SPECIFIC, AND RELIABLE SO TISSUE ANTIGENS LA English DT Article DE HLA-DR; HLA-DQ; POLYMERASE CHAIN REACTION; SEQUENCE-SPECIFIC OLIGONUCLEOTIDE TYPING ID HLA; DNA; ALLELES AB DNA typing of HLA class II alleles of the DRB1/3/4 and DQB1 loci using sequence-specific oligonucleotide probes and polymerase chain reaction-amplified DNA was used for the large-scale typing of donors for the National Marrow Donor Program unrelated donor registry. The results of quality control analysis for the first 7 months of the project show the typing to be highly accurate, specific, and reliable. The percent of correctly classified HLA oligotypes based on 1652 DRB1 and 1652 DQB1 assignments was greater than 99% for DRB1/DRB3/DRB4 and greater than 98% for DQB1. This level of accuracy is particularly remarkable because the quality control samples could not be distinguished from 9011 donor samples tested at the same time by the laboratories. C1 GEORGETOWN UNIV,DEPT MICROBIOL,WASHINGTON,DC. BLOOD CTR SE WISCONSIN INC,MILWAUKEE,WI 53233. AMER RED CROSS NE REG,DEDHAM,MA. WAYNE STATE UNIV,DEPT PATHOL,DETROIT,MI 48202. UNIV PENN,DEPT PATHOL & LAB MED,PHILADELPHIA,PA 19104. CLEVELAND CLIN FDN,TISSUE TYPING LAB,CLEVELAND,OH 44195. JOHNS HOPKINS UNIV,IMMUNOGENET LABS,BALTIMORE,MD. MEM SLOAN KETTERING CANC CTR,NEW YORK,NY 10021. NATL MARROW DONOR PROGRAM,MINNEAPOLIS,MN. RP NG, J (reprint author), USN,MED RES INST,8901 WISCONSIN AVE,MAILSTOP 36,BETHESDA,MD 20889, USA. NR 12 TC 49 Z9 49 U1 0 U2 1 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 NOV PY 1993 VL 42 IS 5 BP 473 EP 479 DI 10.1111/j.1399-0039.1993.tb02191.x PG 7 WC Cell Biology; Immunology; Pathology SC Cell Biology; Immunology; Pathology GA MN115 UT WOS:A1993MN11500002 PM 8146858 ER PT J AU EARLE, CW BAKER, ME DENTON, MB POMEROY, RS AF EARLE, CW BAKER, ME DENTON, MB POMEROY, RS TI IMAGING APPLICATIONS FOR CHEMICAL-ANALYSIS UTILIZING CHARGE-COUPLED-DEVICE ARRAY DETECTORS SO TRAC-TRENDS IN ANALYTICAL CHEMISTRY LA English DT Article ID GEL-ELECTROPHORESIS; RAMAN-SPECTROSCOPY; SYSTEM; FLUORESCENCE; CCD; DNA AB Scientific charge transfer devices (CTDs) are rapidly becoming the detector of choice for optical chemical analysis. The high sensitivity and resolution of these detectors make them ideal for a wide range of chemical imaging applications. In this article we highlight some of the current trends and future research directions of CTDs as imaging detectors for chemical analysis. C1 UNIV ARIZONA,DEPT CHEM,TUCSON,AZ 85721. USN ACAD,DEPT CHEM,ANNAPOLIS,MD 21402. NR 48 TC 16 Z9 16 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0165-9936 J9 TRAC-TREND ANAL CHEM JI Trac-Trends Anal. Chem. PD NOV-DEC PY 1993 VL 12 IS 10 BP 395 EP 403 PG 9 WC Chemistry, Analytical SC Chemistry GA MJ910 UT WOS:A1993MJ91000006 ER PT J AU HABERBERGER, RL MOKHTAR, S BADAWY, H ABUELYAZEED, R AF HABERBERGER, RL MOKHTAR, S BADAWY, H ABUELYAZEED, R TI CHLAMYDIA-TRACHOMATIS ASSOCIATED WITH CHRONIC DYSURIA AMONG PATIENTS WITH SCHISTOSOMA-HAEMATOBIUM SO TRANSACTIONS OF THE ROYAL SOCIETY OF TROPICAL MEDICINE AND HYGIENE LA English DT Article ID INFECTION; CHILDREN AB Eighty-seven Egyptians with Schistosoma haematobium infection (current or past) and chronic dysuria seen at the Theodor Bilharz Research Institute outpatient urology clinic in Imbaba, Cairo, Egypt were investigated for Chlamydia trachomatis infection. Direct fluorescent antibody tests (DFAT) showed 30 urethral swabs (35%) and 40 urine sediments (46%) were positive for Chlamydia. Indirect fluorescent antibody testing showed 29 (34%) serum samples and 25 (29%) urethral smears were positive for Chlamydia. There was a highly significant association between patients with active Schistosoma infection and those with urine and urethral specimens positive for Chlamydia by DFAT (P<0.01). C1 USN,MED RES UNIT 3,CAIRO,EGYPT. THEODOR BILHARZ RES INST,CAIRO,EGYPT. NR 11 TC 1 Z9 1 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 NOV-DEC PY 1993 VL 87 IS 6 BP 671 EP 673 DI 10.1016/0035-9203(93)90284-W PG 3 WC Public, Environmental & Occupational Health; Tropical Medicine SC Public, Environmental & Occupational Health; Tropical Medicine GA ML821 UT WOS:A1993ML82100022 PM 8296370 ER PT J AU RODIER, GR SEVRE, JP BINSON, G GRAY, GC SAIDSALAH GRAVIER, P AF RODIER, GR SEVRE, JP BINSON, G GRAY, GC SAIDSALAH GRAVIER, P TI CLINICAL-FEATURES ASSOCIATED WITH HIV-1 INFECTION IN ADULT PATIENTS DIAGNOSED WITH TUBERCULOSIS IN DJIBOUTI, HORN OF AFRICA SO TRANSACTIONS OF THE ROYAL SOCIETY OF TROPICAL MEDICINE AND HYGIENE LA English DT Note ID IMMUNODEFICIENCY-VIRUS INFECTION C1 USN,MED RES UNIT 3,CAIRO,EGYPT. UNIV MARYLAND,SCH MED,INT HLTH PROGRAM,BALTIMORE,MD 21201. NR 7 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 NOV-DEC PY 1993 VL 87 IS 6 BP 676 EP 677 DI 10.1016/0035-9203(93)90288-2 PG 2 WC Public, Environmental & Occupational Health; Tropical Medicine SC Public, Environmental & Occupational Health; Tropical Medicine GA ML821 UT WOS:A1993ML82100026 PM 8296374 ER PT J AU GIRGIS, NI FARID, Z SULTAN, Y HIBBS, RG AF GIRGIS, NI FARID, Z SULTAN, Y HIBBS, RG TI USE OF DEXAMETHASONE IN TREATMENT OF ENTERIC FEVER COMPLICATED BY CEREBELLAR INVOLVEMENT SO TRANSACTIONS OF THE ROYAL SOCIETY OF TROPICAL MEDICINE AND HYGIENE LA English DT Note ID ATAXIA C1 USN,MED RES UNIT 3,CAIRO,EGYPT. ABBASSIA FEVER HOSP,CAIRO,EGYPT. NR 9 TC 4 Z9 4 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 NOV-DEC PY 1993 VL 87 IS 6 BP 690 EP 691 DI 10.1016/0035-9203(93)90297-4 PG 2 WC Public, Environmental & Occupational Health; Tropical Medicine SC Public, Environmental & Occupational Health; Tropical Medicine GA ML821 UT WOS:A1993ML82100033 PM 8296381 ER PT J AU BRODINE, SK KAIME, EM ROBERTS, C TURNICKY, RP LAL, RB AF BRODINE, SK KAIME, EM ROBERTS, C TURNICKY, RP LAL, RB TI SIMULTANEOUS CONFIRMATION AND DIFFERENTIATION OF HUMAN T-LYMPHOTROPIC VIRUS TYPE-I AND TYPE-II INFECTION BY MODIFIED WESTERN-BLOT CONTAINING RECOMBINANT ENVELOPE GLYCOPROTEINS SO TRANSFUSION LA English DT Article ID ANTIBODY REACTIVITY; IMMUNOBLOT; EPITOPES; DISEASE; DONORS; UNIQUE AB A modified Western blot (WB) that includes both shared (r21e) and unique recombinant envelope proteins from human T-lymphotropic virus (HTLV) type I (rgp46(I)) and type II (rgp46(II)) was compared to conventional HTLV serologic tests in 379 United States blood donors and individuals residing in diverse geographic regions, and the specimens were categorized as positive (n = 158), indeterminate (n = 158), or negative (n = 63) for HTLV infection. Of the 158 HTLV-I/II-positive specimens (66 requiring radioimmunoprecipitation assay [RIPA] for confirmation), 156 reacted concordantly with r21e, gag, and either rgp46(I) or rgp46(II), thus eliminating the need for RIPA in all but two specimens and yielding a test sensitivity of 98.7 percent. Of the 158 indeterminate and 63 negative specimens, none reacted with r21e and rgp46(I) or rgp46(II), yielding a test specificity of 100 percent. Furthermore, analysis of an additional 184 consecutive specimens from a retrovirology reference laboratory demonstrated that the modified WB correctly identified 27 of 28 HTLV-I specimens and, all 13 HTLV-II specimens, with a test sensitivity of 97.6 percent. None of specimens that were indeterminate or nonreactive in conventional WB and/or RIPA and none-of the screening enzyme immunoassay-negative specimens reacted with r21e and either rgp46(I) or rgp46(II), for a, test specificity of 100 percent. Thus, the modified WB appears to be highly sensitive arid specific for simultaneous detection and discrimination of HTLV-I from HTLV-II and has the advantage of being a one-step assay that is easily performed in all types of laboratory settings and allows rapid, reliable, and standardized testing for HTLV-I/II infection. C1 CTR DIS CONTROL,CTR INFECT DIS,DIV VIRAL & RICKETTSIAL DIS,RETROVIRUS DIS BRANCH,ATLANTA,GA 30333. USN,HLTH RES CTR,DEPT HLTH SCI & EPIDEMIOL,DIV EPIDEMIOL,SAN DIEGO,CA. USN HOSP,DEPT INTERNAL MED,DIV HEMATOL ONCOL,SAN DIEGO,CA 92134. WALTER REED ARMY INST RES,DEPT DIAGNOST RETROVIROL,WASHINGTON,DC. NR 20 TC 28 Z9 28 U1 0 U2 0 PU AMER ASSOC BLOOD BANKS PI BETHESDA PA 8101 GLENBROOK RD, BETHESDA, MD 20814-2749 SN 0041-1132 J9 TRANSFUSION JI Transfusion PD NOV-DEC PY 1993 VL 33 IS 11 BP 925 EP 929 DI 10.1046/j.1537-2995.1993.331194082384.x PG 5 WC Hematology SC Hematology GA MM278 UT WOS:A1993MM27800009 PM 7903127 ER PT J AU STALLARD, PY AF STALLARD, PY TI THE LETTERS OF FREMONT,JESSIE,BENTON - HERR,P, SPENCE,ML SO WESTERN HISTORICAL QUARTERLY LA English DT Book Review RP STALLARD, PY (reprint author), USN,KNOXVILLE,TN, USA. NR 1 TC 0 Z9 0 U1 0 U2 0 PU WESTERN HISTORY ASSOCIATION PI LOGAN PA UTAH STATE UNIV, UMC 0740, LOGAN, UT 84322 SN 0043-3810 J9 WESTERN HIST QUART JI West. Hist. Q. PD NOV PY 1993 VL 24 IS 4 BP 580 EP 580 DI 10.2307/970733 PG 1 WC History SC History GA ML374 UT WOS:A1993ML37400033 ER PT J AU GLASSCO, W SUCHOCKI, J GEORGE, C MARTIN, BR MAY, EL AF GLASSCO, W SUCHOCKI, J GEORGE, C MARTIN, BR MAY, EL TI SYNTHESIS, OPTICAL RESOLUTION, ABSOLUTE-CONFIGURATION, AND PRELIMINARY PHARMACOLOGY OF (+)-CIS-2,3,3A,4,5,9B-HEXAHYDRO-1-METHYL-1H-PYRROLO-[32-H]ISOQUINOLINE AND (-)-CIS-2,3,3A,4,5,9B-HEXAHYDRO-1-METHYL-1H-PYRROLO-[3,2-H]ISOQUINOLINE, A STRUCTURAL ANALOG OF NICOTINE SO JOURNAL OF MEDICINAL CHEMISTRY LA English DT Article ID BINDING AB Title compound, 8, has been synthesized from isoquinolinone, 1 (an improved preparation for which is presented) and separated into its antipodes with D- and L-di-p-toluoyltartaric acids. These antipodes and the racemic precursor have been evaluated (and found active) in two in vivo systems for their effects. The most potent of the three, (+)-8, has an ED50 of 7.13 mumol/kg for inhibition of spontaneous activity and 7.45 mumol/kg for antinociception compared to 4.44 and 4.81 mumol/kg, respectively, for (S)-(-)-nicotine. Compounds (-)-8 and 7 are about one-fourth as potent. Isomer (+)-8 has the 3aR,9bS configuration, the latter corresponding to (S)-(-)-nicotine as determined by X-ray crystallography. However, (+)-8 failed to compete for [H-3]-nicotine binding, and its pharmacological effects were not blocked by mecamylamine. These bridged nicotine analogs either are binding to an as-yet-unidentified nicotinic receptor or they represent a novel class of non-nicotinic analgesics. C1 LEEWARD COMMUNITY COLL, DEPT PHYS SCI, PEARL CITY, HI USA. USN, RES LAB, STRUCT MATTER LAB, WASHINGTON, DC 20375 USA. RP VIRGINIA COMMONWEALTH UNIV, MED COLL VIRGINIA, DEPT PHARMACOL & TOXICOL, BOX 524, RICHMOND, VA 23298 USA. FU NIDA NIH HHS [DA00490, P50 DA05274, DA07027] NR 20 TC 60 Z9 60 U1 0 U2 1 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0022-2623 EI 1520-4804 J9 J MED CHEM JI J. Med. Chem. PD OCT 29 PY 1993 VL 36 IS 22 BP 3381 EP 3385 DI 10.1021/jm00074a019 PG 5 WC Chemistry, Medicinal SC Pharmacology & Pharmacy GA ME931 UT WOS:A1993ME93100019 PM 8230128 ER PT J AU BACKER, DC FOSTER, RS SALLMEN, S AF BACKER, DC FOSTER, RS SALLMEN, S TI A 2ND COMPANION OF THE MILLISECOND PULSAR-1620-26 SO NATURE LA English DT Article AB MILLISECOND pulsars are usually found in binary systems. This is in keeping with the generally accepted model for the formation of such pulsars14 in which an old neutron star is spun up to high angular velocities by the accretion of matter from a companion star. The millisecond pulsar 1620-26 in the globular cluster M4 is no exception: timing measurements1,2 reveal the presence of a 0.3-solar-mass companion star (probably a white dwarf) with an orbital period of 191 days. But subsequent measurements of this pulsar have identified a small but significant deviation from the expected behaviour3,4, suggestive of an unusually large second derivative in the pulsar's rotation rate5. Here we examine several possible sources-both intrinsic and extrinsic-for this derivative, and we find that it is best explained by the presence of a second, weakly bound companion object moving in a wide orbit around the main binary system. The third body in this hierarchical system has an orbital period of approximately 100 years and a mass approximately ten times that of Jupiter, and may have been captured during a recent collision with another stellar system6. C1 USN,RES LAB,DIV REMOTE SENSING,WASHINGTON,DC 20375. RP BACKER, DC (reprint author), UNIV CALIF BERKELEY,DEPT ASTRON,BERKELEY,CA 94720, USA. NR 16 TC 68 Z9 69 U1 1 U2 2 PU MACMILLAN MAGAZINES LTD PI LONDON PA PORTERS SOUTH, 4 CRINAN ST, LONDON, ENGLAND N1 9XW SN 0028-0836 J9 NATURE JI Nature PD OCT 28 PY 1993 VL 365 IS 6449 BP 817 EP 819 DI 10.1038/365817a0 PG 3 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA MD951 UT WOS:A1993MD95100042 ER PT J AU COULLARD, CR DELGRECO, JG WAGNER, DK AF COULLARD, CR DELGRECO, JG WAGNER, DK TI UNCOVERING GENERALIZED-NETWORK STRUCTURE IN MATRICES SO DISCRETE APPLIED MATHEMATICS LA English DT Article ID BICIRCULAR MATROIDS; ALGORITHMS; SUBGRAPHS AB A generalized-network matrix is a matrix that has at most two nonzeros per column. The generalized-network recognition problem for an arbitrary matrix A is the problem of determining a nonsingular matrix T, if one exists, such that TA is a generalized-network matrix. This paper presents a polynomial-time algorithm that under an assumption on the combinatorial structure of A solves the generalized-network recognition problem. A class of matroids called bicircular matroids play an important role in the development of the algorithm. C1 OFF NAVAL RES,DIV MATH SCI,CODE 1111,ARLINGTON,VA 22217. NORTHWESTERN UNIV,DEPT IND ENGN & MANAGEMENT SCI,EVANSTON,IL 60208. LOYOLA UNIV,DEPT MATH SCI,CHICAGO,IL 60626. NR 24 TC 1 Z9 1 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0166-218X J9 DISCRETE APPL MATH JI Discret Appl. Math. PD OCT 26 PY 1993 VL 46 IS 3 BP 191 EP 220 DI 10.1016/0166-218X(93)90103-U PG 30 WC Mathematics, Applied SC Mathematics GA MF354 UT WOS:A1993MF35400001 ER PT J AU GOLDBERG, L BUSSE, LE MEHUYS, D AF GOLDBERG, L BUSSE, LE MEHUYS, D TI HIGH-POWER CONTINUOUS-WAVE BLUE-LIGHT GENERATION IN KNBO3 USING SEMICONDUCTOR AMPLIFIER SEEDED BY A LASER-DIODE SO APPLIED PHYSICS LETTERS LA English DT Article AB Diffraction limited emission of a GaAlAs tapered amplifier seeded by a laser diode is frequency doubled in a 12.4-mm-long KNbO3 crystal to generate 62 mW of 429 nm continuous wave emission, corresponding to a conversion efficiency of 1.1%/W cm. Reductions in the conversion efficiency due to nonuniform temperature distribution caused by blue-enhanced infrared absorption were characterized. C1 SDL INC,SAN JOSE,CA 95134. RP GOLDBERG, L (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 10 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 0003-6951 J9 APPL PHYS LETT JI Appl. Phys. Lett. PD OCT 25 PY 1993 VL 63 IS 17 BP 2327 EP 2329 DI 10.1063/1.110515 PG 3 WC Physics, Applied SC Physics GA MD959 UT WOS:A1993MD95900007 ER PT J AU MCGRATH, KJ ROLAND, CM WEISS, RG AF MCGRATH, KJ ROLAND, CM WEISS, RG TI CHAIN CONFIGURATION OF POLYSTYRENE ARISING FROM FREEZE-DRYING DILUTE-SOLUTIONS SO MACROMOLECULES LA English DT Note ID POLYMERS; NMR; MISCIBILITY; BLENDS C1 GEORGETOWN UNIV,DEPT CHEM,WASHINGTON,DC 20057. RP MCGRATH, KJ (reprint author), USN,DIV CHEM,CODE 6120,WASHINGTON,DC 20375, USA. NR 15 TC 18 Z9 18 U1 1 U2 4 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0024-9297 J9 MACROMOLECULES JI Macromolecules PD OCT 25 PY 1993 VL 26 IS 22 BP 6127 EP 6128 DI 10.1021/ma00074a039 PG 2 WC Polymer Science SC Polymer Science GA ME535 UT WOS:A1993ME53500040 ER PT J AU CARSEY, FD GARWOOD, RW AF CARSEY, FD GARWOOD, RW TI IDENTIFICATION OF MODELED OCEAN PLUMES IN GREENLAND GYRE ERS-1 SAR DATA SO GEOPHYSICAL RESEARCH LETTERS LA English DT Article ID SEA ICE; WATER; CIRCULATION; LAYER AB Oceanic convective plumes modeled with a thermobaric large-eddy simulation and driven by conditions similar to those of the Greenland Sea are compared to observations from ERS-1 Synthetic Aperture Radar (SAR) data from the Greenland Sea for the winter of 1992. In both form and size the two representations are seen to compare favorably. The plume-filled area of the SAR image occupies a region about 20 km by 90 km at the ice edge of the open water in ''Nordbukta'', the large seasonal ice retreat, in the ''Odden' ice protuberance in the southern Greenland gyre. In the SAR data the plumes appear to be ice covered while the convective-return areas are open. C1 USN,POSTGRAD SCH,MONTEREY,CA 93943. RP CARSEY, FD (reprint author), JET PROP LAB,JPL MS 300-323,4800 OAK GROVE DR,PASADENA,CA 91109, USA. NR 12 TC 12 Z9 12 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 OCT 22 PY 1993 VL 20 IS 20 BP 2207 EP 2210 DI 10.1029/93GL01954 PG 4 WC Geosciences, Multidisciplinary SC Geology GA ME862 UT WOS:A1993ME86200014 ER PT J AU PUVVADA, S QADRI, SB NACIRI, J RATNA, BR AF PUVVADA, S QADRI, SB NACIRI, J RATNA, BR TI IONOTROPIC GELATION IN A BICONTINUOUS CUBIC PHASE SO JOURNAL OF PHYSICAL CHEMISTRY LA English DT Article ID MONOGLYCERIDE-WATER SYSTEMS; LAMELLAR; IMMOBILIZATION AB Lipid-water systems are known to display cubic phases which are bicontinuous, a property where the entire space of the sample is divided into two disconnected regions which are simultaneously continuous. 1-Monooleoyl-rac-glycerol (C 1 8: 1, [cis] -9), or monoolein, is a polar lipid which exhibits bicontinuous cubic phases over a wide range of lipid/water ratios. We have studied the gelation of the aqueous region in the cubic phase of monoolein using sodium alginate, a water-soluble polysaccharide. Phase diagram studies conducted using optical microscopy and differential scanning calorimetry indicate that the addition of alginate and subsequent gelation, induced ionotropically by the addition of calcium chloride, does not significantly modify the phase behavior of the lipid. However, X-ray diffraction studies show that the addition of alginate induces a structural transformation from a Pn3m to an Ia3d cubic structure, with a concomitant increase in the unit-cell dimension. A small amount of protein, bovine serum albumin, could also be incorporated into both gelled and ungelled samples without disturbing the cubic structure. The release of protein from the gelled cubic phase is considerably slower than from the ungelled sample, making them ideal systems for controlled release applications. C1 USN,RES LAB,CTR BIOMOLEC SCI & ENGN,WASHINGTON,DC 20375. NR 19 TC 15 Z9 15 U1 0 U2 1 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0022-3654 J9 J PHYS CHEM-US JI J. Phys. Chem. PD OCT 21 PY 1993 VL 97 IS 42 BP 11103 EP 11107 DI 10.1021/j100144a034 PG 5 WC Chemistry, Physical SC Chemistry GA MD089 UT WOS:A1993MD08900034 ER PT J AU SPINRAD, RW BROWN, J AF SPINRAD, RW BROWN, J TI EFFECTS OF ASPHERICITY ON SINGLE-PARTICLE POLARIZED-LIGHT SCATTERING SO APPLIED OPTICS LA English DT Article ID REFRACTIVE-INDEX; MUELLER MATRIX; FLOW-CYTOMETRY; MARINE; PHYTOPLANKTON AB Polarized light scattering from individual particles has been analyzed to determine the effects of particle shape. Flow cytometric techniques were used on samples of spherical microspheres and naturally occurring marine algae. An analog of the depolarization ratio was obtained by using crossed polarizers in the source and detector of the flow cytometer. Results suggest that differences between the polarized light scattering of spheres and aspherical particles are not discernible unless the scattered intensities are normalized to the forward scattering, which is roughly equivalent to particulate cross section. This research indicates that polarized light scattering, when normalized to particle size, may provide an indication of the extent of asphericity of hydrosols. C1 OFF NAVAL RES, ARLINGTON, VA 22217 USA. RP SPINRAD, RW (reprint author), BIGELOW LAB OCEAN SCI, MCKOWN POINT, W BOOTHBAY HARBOR, ME 04575 USA. NR 26 TC 3 Z9 3 U1 2 U2 2 PU OPTICAL SOC AMER PI WASHINGTON PA 2010 MASSACHUSETTS AVE NW, WASHINGTON, DC 20036 USA SN 0003-6935 J9 APPL OPTICS JI Appl. Optics PD OCT 20 PY 1993 VL 32 IS 30 BP 6151 EP 6158 PG 8 WC Optics SC Optics GA MC053 UT WOS:A1993MC05300040 PM 20856444 ER PT J AU DERMER, CD SCHLICKEISER, R AF DERMER, CD SCHLICKEISER, R TI MODEL FOR THE HIGH-ENERGY EMISSION FROM BLAZARS SO ASTROPHYSICAL JOURNAL LA English DT Article DE GALAXIES, ACTIVE; GALAXIES, JETS; GAMMA RAYS, THEORY; QUASARS, GENERAL; RADIATION MECHANISMS, MISCELLANEOUS ID ACTIVE GALACTIC NUCLEI; LACERTAE OBJECT MARKARIAN-421; EXTRAGALACTIC RADIO-SOURCES; GAMMA-RAY EMISSION; COMPTON-SCATTERING; MULTIFREQUENCY OBSERVATIONS; RELATIVISTIC JETS; EGRET TELESCOPE; ACCRETION DISKS; COS-B AB Approximate formulae for the instantaneous scattered radiation spectra are derived in the Thomson and Klein-Nishina regimes, assuming that the relativistic electrons are described by an isotropic angular and power-law energy distribution in the outflowing fluid frame. The soft photon source is assumed to be axially symmetric. We find that the Thomson-limit luminosity enhancement in the direction that the scattered radiation is most intense varies as GAMMA6 for photons entering from the side and as GAMMA2 for photons entering directly from behind, where GAMMA is the bulk Lorentz factor of the outflowing plasma cloud. Energy loss and flow are treated in a model where energetic electrons are instantaneously injected with a power-law energy distribution at some height above a point or disk photon source, and instantaneous and time-average spectra are calculated. We also treat the electron energy-loss rate and scattered photon spectra from photon fields that are isotropic in the stationary frame. We calculate broad-band spectra for the case where soft photons are produced by a cool blackbody outer disk extending to the innermost stable orbit of a Schwarzschild black hole, and fit these results to observations of high-energy radiation from 3C 279, 3C 273, and Mrk 421. The observed spectral softening in the regime between hard X-ray and > 100 MeV gamma-rav energies is attributed to the transition from an uncooled to a cooling electron distribution, yielding a break of 0.5 units in the scattered photon spectra index. C1 RICE UNIV,DEPT SPACE PHYS & ASTRON,HOUSTON,TX 77251. MAX PLANCK INST RADIOASTRON,W-5300 BONN 1,GERMANY. RP DERMER, CD (reprint author), USN,RES LAB,E O HULBURT CTR SPACE RES,CODE 7653,WASHINGTON,DC 20375, USA. NR 65 TC 519 Z9 525 U1 4 U2 10 PU UNIV CHICAGO PRESS PI CHICAGO PA 5720 S WOODLAWN AVE, CHICAGO, IL 60637 SN 0004-637X J9 ASTROPHYS J JI Astrophys. J. PD OCT 20 PY 1993 VL 416 IS 2 BP 458 EP 484 DI 10.1086/173251 PN 1 PG 27 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA MA826 UT WOS:A1993MA82600007 ER PT J AU HARRIS, MJ SHARE, GH LEISING, MD GROVE, JE AF HARRIS, MJ SHARE, GH LEISING, MD GROVE, JE TI SMM OBSERVATIONS OF GAMMA-RAY TRANSIENTS .1. A SEARCH FOR VARIABLE EMISSION AT MEV ENERGIES FROM 5 GALACTIC AND EXTRAGALACTIC SOURCES SO ASTROPHYSICAL JOURNAL LA English DT Article DE GALAXIES, INDIVIDUAL (NGC-4151, 5128); GALAXY, CENTER; GAMMA-RAYS, OBSERVATIONS; X-RAYS, STARS ID KEV ANNIHILATION RADIATION; CENTAURUS-A; CYGNUS-X-1; LINE; SPECTRUM; 1E1740.7-2942; REGION AB Transient emission at energies near 1 MeV has been reported by previous experiments on time scales of weeks to months from the Galactic center. the Crab Nebula, and Cyg X-1, and on shorter time-scales from NGC 4151 and Cen A. The spectra of these events fall into two broad classes: a broad line-like feature centered near 1 MeV, and continuum emission (or a very broad feature) extending from approximately 600 keV up to several MeV. These features have been interpreted theoretically in terms of emission from hot pair-dominated plasmas, which may be the necessary positron source implied by reports of narrow e-e+ annihilation lines from Cyg X-1 and the Galactic center. In this paper, data accumulated by the Solar Maximum Mission Gamma Ray Spectrometer (GRS) between 1980 and 1989 have been searched for evidence of these two types of features. We find no compelling evidence for transient 1 MeV broad-line emission on time scales of order 12 d or longer when any of the sources are in the GRS field of view, upper limits on the transient line flux during any 12 d period are typically approximately 4.5 x 10(-3) gamma (cm2 s)-1. The same is true of variability of the continuum between 0.6-7 MeV, for which the upper limits are characteristically approximately 2 times the nominal flux from the Crab for any 12 d period. Our analysis was not sensitive enough either to confirm or to reject several reports from other experiments of transient emission in the 0.6-7 MeV continuum during 1980-1989. We withdraw the statement in Share et al. (1993) that our upper limit for one such event, a transient from the Crab Nebula in 1980 Spring, is inconsistent with the measurement of Ling & Dermer (1991). We did not detect any transient emission in the 1 MeV feature preceding or coinciding with reported emission of the 0.511 MeV annihilation line from the Galactic center in 1988 1989. We discuss briefly the implications of this result for models of the annihilation of positrons produced in the Galactic center source 1E 1740.7 - 2942. C1 CLEMSON UNIV, DEPT PHYS & ASTRON, CLEMSON, SC 29634 USA. USN, RES LAB, E O HULBURT CTR SPACE RES, WASHINGTON, DC 20375 USA. RP HARRIS, MJ (reprint author), UNIV SPACE RES ASSOC, NAVAL RES LAB, MAIL CODE 7652, WASHINGTON, DC 20375 USA. NR 40 TC 9 Z9 10 U1 0 U2 0 PU IOP PUBLISHING LTD PI BRISTOL PA DIRAC HOUSE, TEMPLE BACK, BRISTOL BS1 6BE, ENGLAND SN 0004-637X J9 ASTROPHYS J JI Astrophys. J. PD OCT 20 PY 1993 VL 416 IS 2 BP 601 EP 619 DI 10.1086/173262 PN 1 PG 19 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA MA826 UT WOS:A1993MA82600018 ER PT J AU DOSCHEK, GA STRONG, KT BENTLEY, RD BROWN, CM CULHANE, JL FLUDRA, A HIEI, E LANG, J MARISKA, JT PHILLIPS, KJH PIKE, CD STERLING, AC WATANABE, T ACTON, LW BRUNER, ME HIRAYAMA, T TSUNETA, S ROLLI, E KOSUGI, T YOSHIMORI, M HUDSON, HS METCALF, TR WUELSER, JP UCHIDA, Y OGAWARA, Y AF DOSCHEK, GA STRONG, KT BENTLEY, RD BROWN, CM CULHANE, JL FLUDRA, A HIEI, E LANG, J MARISKA, JT PHILLIPS, KJH PIKE, CD STERLING, AC WATANABE, T ACTON, LW BRUNER, ME HIRAYAMA, T TSUNETA, S ROLLI, E KOSUGI, T YOSHIMORI, M HUDSON, HS METCALF, TR WUELSER, JP UCHIDA, Y OGAWARA, Y TI THE 1992 JANUARY 5 FLARE AT 13.3-UT - OBSERVATIONS FROM YOHKOH SO ASTROPHYSICAL JOURNAL LA English DT Article DE SUN, FLARES; SUN, MAGNETIC FIELDS; SUN, X-RAYS, GAMMA-RAYS ID SOLAR-A MISSION; X-RAY TELESCOPE; NUMERICAL SIMULATIONS; LOOPS; TEMPERATURES; SPECTROMETER; GASDYNAMICS; DIAGNOSTICS; SPECTRA AB We discuss X-ray spectra and soft X-ray images of an M1.9 flare that occurred on 1992 January 5 near 13.3 UT. These data were obtained with instrumentation on the Japanese Yohkoh spacecraft. They cover the entire rise phase of the flare. To supplement these data we have ground-based magnetograms and Halpha spectroheliograms. We calculate the electron temperature and emission measure of the flare as a function of time during the early rise phase using X-ray spectral line intensities and line ratios. Using spectral line widths, line profile asymmetries, and wavelength shifts due to the Doppler effect, we calculate the dynamical properties of the flare. The time development of the morphology of the flare, as revealed by the soft X-ray images and the Halpha spectroheliograms, and the physical quantities inferred from the X-ray spectra, are compared with chromospheric evaporation models. There is an enhancement of blueshifted emission that is closely correlated with the hard X-ray bursts. Heating of one loop in the flare is consistent with a conduction-evaporation model, but heating is found in several structures that do not appear to be physically associated with each other. No standard evaporation model can adequately explain all of the observations. C1 NATL ASTRON OBSERV JAPAN, TOKYO 181, JAPAN. RUTHERFORD APPLETON LAB, DIDCOT OX11 0QX, OXON, ENGLAND. COMPUTAT PHYS INC, FAIRFAX, VA 22031 USA. UNIV TOKYO, INST ASTRON, TOKYO 106, JAPAN. UNIV BERN, INST APPL PHYS, CH-3012 BERN, SWITZERLAND. RIKKYO UNIV, DEPT PHYS, TOSHIMA KU, TOKYO 171, JAPAN. UNIV HAWAII, INST ASTRON, HONOLULU, HI 96822 USA. UNIV TOKYO, FAC SCI, DEPT ASTRON, BUNKYO KU, TOKYO 113, JAPAN. INST SPACE & ASTRONAUT SCI, KANAGAWA 229, JAPAN. LOCKHEED SOLAR & ASTROPHYS LAB, PALO ALTO, CA 94304 USA. UCL, MULLARD SPACE SCI LAB, HOLMBURY RH5 6NT, ENGLAND. RP DOSCHEK, GA (reprint author), USN, RES LAB, E O HULBURT CTR SPACE RES, WASHINGTON, DC 20375 USA. NR 23 TC 21 Z9 21 U1 0 U2 0 PU IOP PUBLISHING LTD PI BRISTOL PA TEMPLE CIRCUS, TEMPLE WAY, BRISTOL BS1 6BE, ENGLAND SN 0004-637X J9 ASTROPHYS J JI Astrophys. J. PD OCT 20 PY 1993 VL 416 IS 2 BP 845 EP + DI 10.1086/173282 PN 1 PG 0 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA MA826 UT WOS:A1993MA82600038 ER PT J AU FABIAN, AC NANDRA, K CELOTTI, A REES, MJ GROVE, JE JOHNSON, WN AF FABIAN, AC NANDRA, K CELOTTI, A REES, MJ GROVE, JE JOHNSON, WN TI OSSE OBSERVATIONS OF THE BRIGHT SEYFERT-1 GALAXY IC-4329A SO ASTROPHYSICAL JOURNAL LA English DT Article DE GALAXIES, INDIVIDUAL (IC 4329A); GALAXIES, SEYFERT; GAMMA-RAYS, OBSERVATIONS; GAMMA RAYS, THEORY ID COLD MATTER; SPECTRA AB We present the first hard X-ray/soft gamma-ray observations from the Oriented Scintillation Spectrometer Experiment (OSSE) of a bright Seyfert 1 galaxy, IC 4329A. Significant variability was seen over the 3 week observing period. The 50-200 keV spectrum is steep and can be characterized by a power-law spectrum of photon index 2.84 +/- 0.36, at 90% confidence. This is significantly steeper than the X-ray spectrum found from Ginga data of the source. Joint fits of the Ginga and OSSE data are well modeled by a thermal model represented by an exponential spectral break with an e-folding energy at about 130 keV. Good fits are also obtained if a reflection component is included. We constrain possible nonthermal continuum models involving photon-photon pair production. There is a similarity between the X-ray/gamma-ray spectra of IC 4329A and Cygnus X-1. C1 USN,RES LAB,EO HULBURT CTR SPACE RES,WASHINGTON,DC 20375. RP FABIAN, AC (reprint author), INST ASTRON,MADINGLEY RD,CAMBRIDGE CB3 0HA,ENGLAND. RI Johnson, Neil/G-3309-2014 NR 16 TC 10 Z9 10 U1 0 U2 0 PU UNIV CHICAGO PRESS PI CHICAGO PA 5720 S WOODLAWN AVE, CHICAGO, IL 60637 SN 0004-637X J9 ASTROPHYS J JI Astrophys. J. PD OCT 20 PY 1993 VL 416 IS 2 BP L57 EP L60 DI 10.1086/187070 PN 2 PG 4 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA MA827 UT WOS:A1993MA82700004 ER PT J AU HOFFMAN, CA MEYER, JR YOUNGDALE, ER BARTOLI, FJ MILES, RH AF HOFFMAN, CA MEYER, JR YOUNGDALE, ER BARTOLI, FJ MILES, RH TI INTERFACE ROUGHNESS SCATTERING IN SEMICONDUCTING AND SEMIMETALLIC INAS-GA1-XINXSB SUPERLATTICES SO APPLIED PHYSICS LETTERS LA English DT Article ID STRAINED-LAYER SUPERLATTICES; HGTE-CDTE SUPERLATTICES; QUANTUM-WELLS; BAND-GAP; ELECTRON; MOBILITIES; TRANSPORT AB An analysis of magnetotransport results for InAs-Ga1-xInxSb superlattices with a range of layer thicknesses demonstrates that interface roughness scattering dominates the electron mobility under most conditions of interest for infrared detector applications. However, the dependence on well thickness is much weaker than the d1(6) relation observed in other systems with thicker barriers, which is consistent with predictions based on the sensitivity of the energy levels to roughness fluctuations. Theory also correctly predicts an abrupt mobility decrease at the semiconductor-to-semimetal transition point, as well as the coexistence of two electron species in semimetallic samples. C1 HUGHES RES LABS,MALIBU,CA 90265. RP HOFFMAN, CA (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 16 TC 53 Z9 53 U1 0 U2 4 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0003-6951 J9 APPL PHYS LETT JI Appl. Phys. Lett. PD OCT 18 PY 1993 VL 63 IS 16 BP 2210 EP 2212 DI 10.1063/1.110800 PG 3 WC Physics, Applied SC Physics GA MC050 UT WOS:A1993MC05000016 ER PT J AU FLIPPENANDERSON, JL ZAJAC, WW BUZBY, JH WALTERS, TR AF FLIPPENANDERSON, JL ZAJAC, WW BUZBY, JH WALTERS, TR TI STRUCTURE OF 1-BENZOYL-4,4,5,5-TETRAMETHYL-2-PHENYLIMIDAZOLINE HYDRATE SO ACTA CRYSTALLOGRAPHICA SECTION C-CRYSTAL STRUCTURE COMMUNICATIONS LA English DT Article AB The imidazoline ring is in an envelope conformation and the two phenyl rings form a dihedral angle of 49.3-degrees with respect to each other. An intermolecular hydrogen bond is formed between the water and the unsubstituted N atom. C1 VILLANOVA UNIV,DEPT CHEM,VILLANOVA,PA 19085. RP FLIPPENANDERSON, JL (reprint author), USN,RES LAB,STRUCT MATTER LAB,WASHINGTON,DC 20375, USA. NR 4 TC 0 Z9 0 U1 1 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 OCT 15 PY 1993 VL 49 BP 1792 EP 1793 DI 10.1107/S0108270193002276 PN 10 PG 2 WC Chemistry, Multidisciplinary; Crystallography SC Chemistry; Crystallography GA MF448 UT WOS:A1993MF44800034 ER PT J AU GLESENER, JW TONUCCI, RJ AF GLESENER, JW TONUCCI, RJ TI MICROPATTERNED DIAMOND SUBSTRATES SO JOURNAL OF APPLIED PHYSICS LA English DT Note ID CHEMICAL VAPOR-DEPOSITION; FILMS AB The patterning and characterization of a single crystal diamond substrate with a regular array of 8 micron features is described. Patterned arrays in diamond have been formed by a process consisting of the evaporation of ferrous metals through a glass channel mask onto the (100) surface of diamond. The evaporation was followed by a high temperature heat treatment to form a metal carbide. The carbide was then removed by acid etching, leaving behind a positive two-dimensional pattern on the diamond surface. Further pattern transfers were reproducibly accomplished by pressing the etched diamond surface into gold and aluminum foils. RP GLESENER, JW (reprint author), USN,RES LAB,DIV OPT SCI,WASHINGTON,DC 20375, USA. NR 7 TC 1 Z9 1 U1 0 U2 1 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0021-8979 J9 J APPL PHYS JI J. Appl. Phys. PD OCT 15 PY 1993 VL 74 IS 8 BP 5280 EP 5281 DI 10.1063/1.354272 PG 2 WC Physics, Applied SC Physics GA MC030 UT WOS:A1993MC03000077 ER PT J AU TOLLES, WM AF TOLLES, WM TI VIBRATION-INTERNAL ROTATION COUPLING IN TRIFLUORONITROMETHANE SO JOURNAL OF CHEMICAL PHYSICS LA English DT Article ID MICROWAVE AB The barrier to internal rotation for CF3NO2 has previously been determined in the early 1960s by two independent methods (1) electron diffraction, and (2) rotational microwave spectroscopy. These two methods have indicated the barrier to rotation to be 3 kcal/mol and 74 cal/mol, respectively. This discrepancy has not been resolved in 25 years. In an attempt to explain this discrepancy, a model has been developed to incorporate the effects of coupling between the internal rotation motion and the vibration of the NO2 group. This coupling appears to be present based on symmetry considerations and based upon geometries obtained from electronic calculations of the molecule. Both electron diffraction radial distribution curves and rotational microwave spectra are simulated and compared with experimental data. A surprising result indicates that the coupling between internal rotation and the vibrational motions may be strong, but minimally visible in the rotational spectrum. Such coupling can introduce interatomic correlation which affects the appearance of diffraction experiments, yet is not apparent in microwave spectra. This model is consistent with the behavior observed by the two methods, and is offered as the explanation for the otherwise contradictory interpretations. RP TOLLES, WM (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 10 TC 5 Z9 5 U1 0 U2 2 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 OCT 15 PY 1993 VL 99 IS 8 BP 5718 EP 5722 DI 10.1063/1.465921 PG 5 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA MB564 UT WOS:A1993MB56400010 ER PT J AU SIEGEL, JN JUNE, CH YAMADA, H RAPP, UR SAMELSON, LE AF SIEGEL, JN JUNE, CH YAMADA, H RAPP, UR SAMELSON, LE TI RAPID ACTIVATION OF C-RAF-1 AFTER STIMULATION OF THE T-CELL RECEPTOR OR THE MUSCARINIC RECEPTOR TYPE-1 IN RESTING T-CELLS SO JOURNAL OF IMMUNOLOGY LA English DT Article ID PROTEIN-TYROSINE KINASE; ANTIGEN RECEPTOR; SIGNAL TRANSDUCTION; MAP KINASE; RAF-1 KINASE; ZETA-CHAIN; MONOCLONAL-ANTIBODY; PHOSPHATASE CD45; PHOSPHORYLATION; INTERLEUKIN-2 AB The c-Raf-1 serine/threonine kinase is an important component of signal transduction pathways mediating the effects of a variety of growth factors. In activated T cells, IL-2 has been shown to induce activation of c-Raf-1, but c-Raf-1 has not previously been shown to be activated through the T-cell receptor (TCR) in resting G0 T cells. Using a sensitive immune complex kinase reaction, we show that cross-linking of the stimulatory and costimulatory receptors CD3, CD4, or CD28 induces c-Raf-1 activation in highly purified resting peripheral blood human T cells. In contrast, cross-linking the nonstimulatory receptor CD45 did not induce c-Raf-1. Surprisingly, although earlier studies had shown delayed kinetics in response to Thy-1 stimulation in murine cells, c-Raf-1 activation in response to CD3 cross-linking was one of the earliest measurable events. In spite of its early kinetics, c-Raf-1 activation was found to be downstream of several other early signal transduction events, including activation of a tyrosine kinase and a tyrosine phosphatase. Several lines of evidence suggest that activation of c-Raf-1 in response to TCR stimulation may be PKC-dependent: first, phorbol esters are extremely potent activators of c-Raf-1 in human T cells; second, the kinetics of accumulation of products of phosphatidylinositol hydrolysis coincides with the kinetics of c-Raf-1 activation; and third, physiologic activation of the PLC/PKC pathway through a transfected, G-protein-coupled receptor HM1 induced similar levels of c-Raf-1 activation with a similar time course. We conclude that c-Raf-1 activation is tightly coupled to TCR stimulation and may participate in signal transduction pathways in resting, G0 T cells. The observation that the HM1 receptor can also activate c-Raf-1 suggests that T cells have the capability to utilize both tyrosine kinase-dependent and tyrosine kinase-independent mechanisms of c-Raf-1 activation. C1 NCI,FREDERICK CANC RES & DEV CTR,VIRAL CARCINOGENESIS LAB,FREDERICK,MD 21702. NICHHD,CELL BIOL & METAB BRANCH,BETHESDA,MD 20892. RP SIEGEL, JN (reprint author), USN,INST MED RES,IMMUNE CELL BIOL PROGRAM,MAIL STOP 6,BETHESDA,MD 20889, USA. NR 64 TC 45 Z9 45 U1 0 U2 0 PU AMER ASSOC IMMUNOLOGISTS PI BETHESDA PA 9650 ROCKVILLE PIKE, BETHESDA, MD 20814 SN 0022-1767 J9 J IMMUNOL JI J. Immunol. PD OCT 15 PY 1993 VL 151 IS 8 BP 4116 EP 4127 PG 12 WC Immunology SC Immunology GA MB163 UT WOS:A1993MB16300018 PM 8409389 ER PT J AU BOWMAN, SR LYNN, JG SEARLES, SK FELDMAN, BJ MCMAHON, J WHITNEY, W EPP, D QUARLES, GJ RILEY, KJ AF BOWMAN, SR LYNN, JG SEARLES, SK FELDMAN, BJ MCMAHON, J WHITNEY, W EPP, D QUARLES, GJ RILEY, KJ TI HIGH-AVERAGE-POWER OPERATION OF A Q-SWITCHED DIODE-PUMPED HOLMIUM LASER SO OPTICS LETTERS LA English DT Article ID YAG; TM; HO AB We have investigated high-peak- and high-average-po- operation of diode-pumped, thulium-sensitized, holmium 2.1-mum lasers. Free-running laser powers of 14 W at 29 Hz have been demonstrated with 2.6% electrical efficiency. Q-switched operation produced average powers in excess of 11 W in a burst of short pulses. Preliminary optical parametric oscillator frequency conversion of the holmium laser to 4 mum is also reported. C1 LIGHTNING OPT CORP,TARPON SPRINGS,FL 34689. GEOCENTERS INC,FT WASHINGTON,MD 20744. RP BOWMAN, SR (reprint author), USN,RES LAB,CODE 5640,WASHINGTON,DC 20375, USA. NR 9 TC 18 Z9 19 U1 1 U2 3 PU OPTICAL SOC AMER PI WASHINGTON PA 2010 MASSACHUSETTS AVE NW, WASHINGTON, DC 20036 SN 0146-9592 J9 OPT LETT JI Opt. Lett. PD OCT 15 PY 1993 VL 18 IS 20 BP 1724 EP 1726 DI 10.1364/OL.18.001724 PG 3 WC Optics SC Optics GA MA886 UT WOS:A1993MA88600012 PM 19823497 ER PT J AU HOFFMAN, CA MEYER, JR BARTOLI, FJ DIVENERE, A YI, XJ HOU, CL WANG, HC KETTERSON, JB WONG, GK AF HOFFMAN, CA MEYER, JR BARTOLI, FJ DIVENERE, A YI, XJ HOU, CL WANG, HC KETTERSON, JB WONG, GK TI SEMIMETAL-TO-SEMICONDUCTOR TRANSITION IN BISMUTH THIN-FILMS SO PHYSICAL REVIEW B LA English DT Note ID ELECTRICAL TRANSPORT-PROPERTIES; PURE BISMUTH AB Field- and temperature-dependent magnetotransport measurements on Bi layers grown by molecular-beam epitaxy have been analyzed by mixed-conduction techniques. In the thin-film limit, the net hole density scales inversely with layer thickness while the mobility scales linearly. By studying the minority electron concentration as a function of temperature in the range 100-300 K, we have unambiguously confirmed the long-standing theoretical prediction that quantum confinement should convert Bi from a semimetal to a semiconductor at a critical thickness on the order of 300 angstrom. C1 NORTHWESTERN UNIV,DEPT PHYS & ASTRON,EVANSTON,IL 60208. RP HOFFMAN, CA (reprint author), USN,RES LAB,CODE 5613,WASHINGTON,DC 20375, USA. RI Ketterson, John/B-7234-2009 NR 31 TC 154 Z9 155 U1 5 U2 33 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD OCT 15 PY 1993 VL 48 IS 15 BP 11431 EP 11434 DI 10.1103/PhysRevB.48.11431 PG 4 WC Physics, Condensed Matter SC Physics GA MD745 UT WOS:A1993MD74500101 ER PT J AU OMAGGIO, JP MEYER, JR HOFFMAN, CA DIVENERE, A YI, XJ HOU, CL WANG, HC KETTERSON, JB WONG, GK AF OMAGGIO, JP MEYER, JR HOFFMAN, CA DIVENERE, A YI, XJ HOU, CL WANG, HC KETTERSON, JB WONG, GK TI MAGNETOOPTICAL DETERMINATION OF THE T-POINT ENERGY-GAP IN BISMUTH SO PHYSICAL REVIEW B LA English DT Note AB We have carried out infrared magnetotransmission measurements on a 5000-angstrom-thick bismuth film grown by molecular beam epitaxy onto a CdTe substrate. The data for photon energies below 300 meV display at least ten orders of minima due to interband transitions at the L points. In contrast to previous results from magnetoreflectivity experiments on bulk Bi, two concurrent series of resonances separated by a nearly constant energy of almost-equal-to 5 meV are observed. An additional series of strong oscillations emerges at somewhat higher photon energies, due to interband transitions at the T point. The energy dispersion of these resonances are fit quite well by a simple nonparabolic model, allowing us to directly determine the T-point energy gap (407 meV) and the electron-hole reduced mass (0.027m0, which implies an electron mass of 0.048 m0). C1 NORTHWESTERN UNIV,DEPT PHYS & ASTRON,EVANSTON,IL 60208. GM CORP,WARREN,MI 48090. RP OMAGGIO, JP (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. RI Ketterson, John/B-7234-2009 NR 23 TC 9 Z9 9 U1 0 U2 1 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD OCT 15 PY 1993 VL 48 IS 15 BP 11439 EP 11442 DI 10.1103/PhysRevB.48.11439 PG 4 WC Physics, Condensed Matter SC Physics GA MD745 UT WOS:A1993MD74500103 ER PT J AU MAK, CL SOORYAKUMAR, R STEINER, MM JONKER, BT AF MAK, CL SOORYAKUMAR, R STEINER, MM JONKER, BT TI OPTICAL-TRANSITIONS IN ZN1-XCOXSE AND ZN1-XFEXSE - STRONG CONCENTRATION-DEPENDENT EFFECTIVE P-D EXCHANGE SO PHYSICAL REVIEW B LA English DT Article ID DILUTED MAGNETIC SEMICONDUCTORS; SEMIMAGNETIC SEMICONDUCTORS; STRUCTURAL CHARACTERIZATION; RAMAN-SCATTERING; ZNSE-CO; SPECTRA; SUSCEPTIBILITY; LUMINESCENCE; EXCITATIONS; IMPURITIES AB Results of photoluminescence (PL) and resonant Raman scattering from single crystalline epitaxial films of Zn1-xCoxSe and Zn1-xFexSe are presented. Samples with Co concentrations up to x = 0.1 and Fe concentrations in the range 0 < x < 0.75 were studied. For x < 0.03 (Co) and x < 0.30 (Fe) the optical emission associated with the 3d deep levels are observed as discrete transitions that broaden very rapidly and weaken as the doping further increases. It is proposed that the increase in concentration x leads to an increase in the exchange between low-lying crystal-field split d levels and band electrons, and thus to the changes in the photoluminescence. Concomitant with the onset of broadening of the PL, a continuum of Raman excitations extending from zero to about 4000 cm-1 is observed which is resonantly enhanced as the energy of the exciting radiation approaches the alloy band gap from below. The Raman-scattering features are discussed in terms of electronic scattering within the 3d-ion band manifold located in the gap of the insulating host. The role of strong disorder and correlations on the electronic Raman excitations in these insulating structures are briefly addressed. 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 55 TC 8 Z9 8 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 OCT 15 PY 1993 VL 48 IS 16 BP 11743 EP 11751 DI 10.1103/PhysRevB.48.11743 PG 9 WC Physics, Condensed Matter SC Physics GA ME601 UT WOS:A1993ME60100021 ER PT J AU MOORE, WJ LINCHUNG, PJ FREITAS, JA ALTAISKII, YM ZUEV, VL IVANOVA, LM AF MOORE, WJ LINCHUNG, PJ FREITAS, JA ALTAISKII, YM ZUEV, VL IVANOVA, LM TI NITROGEN DONOR EXCITATION-SPECTRA IN 3C-SIC SO PHYSICAL REVIEW B LA English DT Note ID SPECTROSCOPY; GERMANIUM; CARBIDE AB Infrared transmission spectra of high-quality vapor-grown 3C-SiC in the region of Is -2p donor excitation transitions reveal three sequences of donor transitions analogous to those found in donor-doped silicon and germanium. Two of these sequences, a broad sequence and a sharp one, occur when the sample is held near 4.2 K. The broad sequence is assigned to transitions arising from the Is (A) ground state of nitrogen. On warming, a second broad sequence, assigned to transitions from the Is (E) ground state of nitrogen, is observed. The measured separation of these sequences, the ls(A)-1s(E) valley-orbit splitting, is 8.34 meV. Excellent correspondence with theory is found for a nitrogen binding energy of 54.2 meV, consistent with other optical determinations of the nitrogen donor binding energy, and a static dielectric constant of 9.8. The sharp sequence, similar to sharp sequences found in very pure germanium, is attributed to an unidentified second donor whose excitation transitions are not broadened by grown-in local strain, e.g., an impurity free of chemical shift. C1 SACHS FREEMAN ASSOCIATES INC,LANDOVER,MD 20785. KIEV POLYTECH INST,KIEV,UKRAINE. AA BAIKOV MET INST,MOSCOW,RUSSIA. RP MOORE, WJ (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 9 TC 24 Z9 24 U1 0 U2 1 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD OCT 15 PY 1993 VL 48 IS 16 BP 12289 EP 12291 DI 10.1103/PhysRevB.48.12289 PG 3 WC Physics, Condensed Matter SC Physics GA ME601 UT WOS:A1993ME60100094 ER PT J AU KNIPP, PA REINECKE, TL AF KNIPP, PA REINECKE, TL TI COUPLING OF ELECTRONS TO INTERFACE PHONONS IN SEMICONDUCTOR QUANTUM-WELLS SO PHYSICAL REVIEW B LA English DT Letter ID FROHLICH INTERACTION; OPTICAL PHONONS; SUPERLATTICES; POLARITONS; MODES AB In a recent paper [B. K. Ridley and M. Babiker, Phys. Rev. B 43, 9096 (1991)] the authors have argued that when retardation is taken into account the interface phonons of semiconductor superlattices obtained from the usual dielectric continuum approach are transverse polariton modes and that they therefore do not couple to electrons via the strong Frohlich interaction. Here we show that the interface polaritons obtained from this dielectric continuum approach, in general, have both transverse and longitudinal components and that the dispersion and character of the modes are affected by retardation only for small wave vectors (k less than or similar omega(phonon)/c). For wave vectors of interest in electron-phonon scattering, the interaction is given to a good approximation by the usual Frohlich interaction neglecting retardation. C1 USN,RES LAB,WASHINGTON,DC 20375. NR 18 TC 9 Z9 9 U1 0 U2 1 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD OCT 15 PY 1993 VL 48 IS 16 BP 12338 EP 12341 DI 10.1103/PhysRevB.48.12338 PG 4 WC Physics, Condensed Matter SC Physics GA ME601 UT WOS:A1993ME60100107 ER PT J AU BOOS, JB SHANABROOK, BV PARK, D DAVIS, JL DIETRICH, HB AF BOOS, JB SHANABROOK, BV PARK, D DAVIS, JL DIETRICH, HB TI IMPACT IONIZATION IN HIGH-OUTPUT-CONDUCTANCE REGION OF 0.5 MU-M ALSB/INAS HEMTS SO ELECTRONICS LETTERS LA English DT Article DE INAS; IMPACT IONIZATION; FIELD-EFFECT TRANSISTORS; MICROWAVE DEVICES ID FIELD-EFFECT TRANSISTORS AB DC and RF measurements on AlSb/InAs HEMTs biased in the commonly observed high output conductance region are reported. In this region, high gate current, inductive output impedance and increased noise were observed resulting from impact ionisation. Devices with a 0.5mum gate length exhibited a maximum f(T) and f(max) of 25 and 40 GHz, respectively. RP BOOS, JB (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 6 TC 19 Z9 19 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 OCT 14 PY 1993 VL 29 IS 21 BP 1888 EP 1890 DI 10.1049/el:19931257 PG 3 WC Engineering, Electrical & Electronic SC Engineering GA NE967 UT WOS:A1993NE96700055 ER PT J AU MILLER, JB WALTON, JH ROLAND, CM AF MILLER, JB WALTON, JH ROLAND, CM TI THE NMR CHEMICAL-SHIFT OF XE-129 DISSOLVED IN POLYMERS SO MACROMOLECULES LA English DT Article ID NUCLEAR MAGNETIC-RESONANCE; STATISTICAL MECHANICAL MODEL; SIMPLE PENETRANTS; SOLID POLYMERS; XE-129 NMR; GLASSY-POLYMERS; AMORPHOUS STATE; DIFFUSION; PROBE; DEPENDENCE AB The temperature dependence of the chemical shift of Xe-129 dissolved in polymers is examined in the context of the van der Waals interaction. It is found that above the glass transition temperature for the polymers studied herein, the Xe-129 chemical shift can be described by a 6-12 Lennard-Jones potential The cell model of DiBenedetto is used to describe the average local environment of the amorphous polymer and sum over the pairwise interactions of the potential. We show the van der Waals shift model agrees reasonably well with the Xe-129 chemical shifts and provides the potential to determine solubility parameters and van der Waals radii of polymers. RP MILLER, JB (reprint author), USN,RES LAB,DIV CHEM,CODE 6120,WASHINGTON,DC 20375, USA. NR 51 TC 34 Z9 34 U1 3 U2 7 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0024-9297 J9 MACROMOLECULES JI Macromolecules PD OCT 11 PY 1993 VL 26 IS 21 BP 5602 EP 5610 DI 10.1021/ma00073a011 PG 9 WC Polymer Science SC Polymer Science GA MC071 UT WOS:A1993MC07100011 ER PT J AU WIDING, KG FELDMAN, U AF WIDING, KG FELDMAN, U TI NONPHOTOSPHERIC ABUNDANCES IN A SOLAR ACTIVE-REGION SO ASTROPHYSICAL JOURNAL LA English DT Article DE SUN, ABUNDANCES; SUN, ACTIVITY; SUN, UV RADIATION ID B-LIKE IONS; ELEMENTAL ABUNDANCES; PHOTOSPHERIC ABUNDANCES; ENERGETIC PARTICLES; ATMOSPHERE; EMISSION; FLARE; SPECTRUM; OXYGEN; RATES AB Element abundances have been determined for a solar active region observed to have a highly nonphotospheric Ne/Mg abundance ratio associated with an open magnetic field. This active region is an example of a class of relatively inconspicuous features with open magnetic fields which contrast with brighter, more compact emission regions with less anomalous abundance ratios. The study is based on images of the active region in Ne VI, VII, Mg VI-VIII, Na VIII, Si VIII, and Ca VIII, IX photographed in the 300-600 angstrom range by the NRL spectroheliograph on Skylab. Element abundances relative to magnesium were determined by combining plots of the ion differential emission measures. The electron density was bracketed in the range 4 x 10(9) to 2 x 10(10) cm-3, and ionization equilibrium was assumed. The Ne/Mg abundance ratio was also derived from the Ne VI to Mg VI intensity ratios observed at 400 angstrom. We find that the Ne/Mg abundance ratio is 15 times smaller than in the photosphere, whereas the abundances of Na, Si, and Ca relative to magnesium are not different by more than a factor of 2 from the ratios in the photosphere. From other evidence we conclude that the abundances of the low first ionization potential group of elements (Na, Mg, Si, and Ca) are enriched more than tenfold relative to high FIP neon in this region with open magnetic fields. Properties of a similar group of solar features are summarized. RP WIDING, KG (reprint author), USN,RES LAB,EO HULBURT CTR SPACE RES,WASHINGTON,DC 20375, USA. NR 39 TC 38 Z9 38 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 OCT 10 PY 1993 VL 416 IS 1 BP 392 EP & DI 10.1086/173244 PN 1 PG 0 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA MA328 UT WOS:A1993MA32800035 ER PT J AU DANLY, L ALBERT, CE KUNTZ, KD AF DANLY, L ALBERT, CE KUNTZ, KD TI A DETERMINATION OF THE DISTANCE TO THE HIGH-VELOCITY CLOUD COMPLEX-M SO ASTROPHYSICAL JOURNAL LA English DT Article DE GALAXY, HALO; ISM, CLOUDS; ISM, INDIVIDUAL (HVC COMPLEX M); ISM, STRUCTURE; RADIO LINES, ISM; ULTRAVIOLET, INTERSTELLAR ID WAY HALO GAS; STAR; HD-93521 AB The high-velocity cloud complex M has been detected in absorption toward the halo star BD + 38-degrees-2182 (z = 4.4 kpc) with the International Ultraviolet Explorer (IUE) echelle spectrograph. Absorption is seen out to - 120 km s-1 in the saturated resonance lines of C II, Si II, and 0 I. Data on highly ionized species of C IV and Si IV are too noisy to determine the presence or absence of absorption from highly ionized gas at the velocities of complex M. The BD + 38-degrees-2182 data are compared to similar data for HD 93521, which lies 27 arcmin away, but at a z-distance of only 1.5 kpc. The absorption line detection toward BD +38-degrees-2182, along with the lack of observed absorption at v < - 85 km s-1 toward HD 93521 places the distance to complex M at 1.5 < z < 4.4 kpc. Complex M has a mass between 10(4) and 10(5) M., and the lower limits on the column densities of C, 0, and Si are between 1.0 and 1.4 dex below solar metallicity. C1 USN ACAD,ANNAPOLIS,MD 21402. RP DANLY, L (reprint author), SPACE TELESCOPE SCI INST,3700 SAN MARTIN DR,BALTIMORE,MD 21218, USA. NR 33 TC 78 Z9 78 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 OCT 10 PY 1993 VL 416 IS 1 BP L29 EP & DI 10.1086/187063 PN 2 PG 0 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA MA331 UT WOS:A1993MA33100008 ER PT J AU QUIRRENBACH, A HUMMEL, CA BUSCHER, DF ARMSTRONG, JT MOZURKEWICH, D ELIAS, NM AF QUIRRENBACH, A HUMMEL, CA BUSCHER, DF ARMSTRONG, JT MOZURKEWICH, D ELIAS, NM TI THE ASYMMETRIC ENVELOPE OF GAMMA-CASSIOPEIAE OBSERVED WITH THE MK III OPTICAL INTERFEROMETER SO ASTROPHYSICAL JOURNAL LA English DT Article DE STARS, EMISSION-LINE, BE; STARS, IMAGING; STARS, INDIVIDUAL (GAMMA-CASSIOPEIAE); STARS, MASS LOSS; TECHNIQUES, INTERFEROMETRIC ID STARS; MODEL AB We present interferometric observations of the Be star gamma Cas in the light of the Halpha emission line. North-south baselines ranging from 4.2 to 23.6 m have been used over a large range of hour angles. With the resulting coverage of the u-v plane, we have been able for the first time to measure the asymmetry of the Halpha emitting region directly. The brightness distribution on the sky can be fit by an elliptical Gaussian model with an axial ratio of 0.74 and an angular diameter (FWHM of the major axis) of 3.2 milliarcsec (mas). The radial brightness distribution is not well-constrained by our data; elliptical uniform disk or ring models also give acceptable fits. If the envelope of gamma Cas is symmetric with respect to the rotation axis, the inclination of this axis must be at least 42-degrees. The major axis of the brightness distribution and the polarization position angle are perpendicular to each other. These results support the standard interpretation of the linear polarization of Be stars, which is thought to be produced by electron scattering in a flattened envelope or disk. Competing nearly spherical models can be ruled out. C1 USN,RES LAB,DIV REMOTE SENSING,WASHINGTON,DC 20375. RP QUIRRENBACH, A (reprint author), USN OBSERV,NRL,OPT INTERFEROMETER PROJECT,CODE AD5,3450 MASSACHUSETTS AVE NW,WASHINGTON,DC 20392, USA. NR 21 TC 44 Z9 44 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 OCT 10 PY 1993 VL 416 IS 1 BP L25 EP L28 DI 10.1086/187062 PN 2 PG 4 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA MA331 UT WOS:A1993MA33100007 ER PT J AU KING, RS KISER, WR AF KING, RS KISER, WR TI PSYCHOLOGICAL DISTRESS AND PRETERM DELIVERY - UNCONVINCING LINK SO BRITISH MEDICAL JOURNAL LA English DT Letter RP KING, RS (reprint author), USN HOSP,DEPT FAMILY PRACTICE,2080 CHILD ST,JACKSONVILLE,FL 32214, USA. NR 1 TC 1 Z9 1 U1 0 U2 0 PU BRITISH MED JOURNAL PUBL GROUP PI LONDON PA BRITISH MED ASSOC HOUSE, TAVISTOCK SQUARE, LONDON, ENGLAND WC1H 9JR SN 0959-8138 J9 BRIT MED J JI Br. Med. J. PD OCT 9 PY 1993 VL 307 IS 6909 BP 934 EP 934 PG 1 WC Medicine, General & Internal SC General & Internal Medicine GA MB847 UT WOS:A1993MB84700039 PM 8267774 ER PT J AU SISKIND, DE SUMMERS, ME MLYNCZAK, MG AF SISKIND, DE SUMMERS, ME MLYNCZAK, MG TI AN EVALUATION OF O-2(B(1)SIGMA(G)) AS A POSSIBLE SOURCE OF OH AND ODD-NITROGEN IN THE STRATOSPHERE AND MESOSPHERE SO GEOPHYSICAL RESEARCH LETTERS LA English DT Article ID OZONE AB A one dimensional photochemical model has been used to evaluate the hypothesis that the oxidation of H-2 and N2O by O2(b1SIGMA(g)) could lead to significant production of OH and odd-nitrogen in the middle atmosphere. For the reaction with H-2, even if all the quenchings lead to oxidation, the change in the OH column is only 13%. This is still too small to resolve the discrepancy between the model and ground based measurements and furthermore could not account for the apparent change in the ground based column with time. For the reaction with N2O, it is possible to produce significant odd-nitrogen in the lower stratosphere only if the oxidation yield is at least 5-10%. However, one then gets a surplus of odd-nitrogen in the upper stratosphere unless one makes the additional assumption that the production of O2(b1SIGMA(g)) from O(1D) quenching is small. C1 NASA,LANGLEY RES CTR,HAMPTON,VA 23681. RP SISKIND, DE (reprint author), USN,RES LAB,EO HULBURT CTR SPACE RES,CODE 7641,WASHINGTON,DC 20375, USA. RI Mlynczak, Martin/K-3396-2012 NR 13 TC 9 Z9 9 U1 0 U2 0 PU AMER GEOPHYSICAL UNION PI WASHINGTON PA 2000 FLORIDA AVE NW, WASHINGTON, DC 20009 SN 0094-8276 J9 GEOPHYS RES LETT JI Geophys. Res. Lett. PD OCT 8 PY 1993 VL 20 IS 19 BP 2047 EP 2050 DI 10.1029/93GL02471 PG 4 WC Geosciences, Multidisciplinary SC Geology GA MB580 UT WOS:A1993MB58000010 ER PT J AU COLLMAN, JP ARNOLD, HJ FITZGERALD, JP WEISSMAN, KJ AF COLLMAN, JP ARNOLD, HJ FITZGERALD, JP WEISSMAN, KJ TI HETEROMETALLIC AND HOMOMETALLIC RUTHENIUM AND OSMIUM DOUBLE-BONDS IN METALLOPORPHYRIN AND METALLOTETRAAZAPORPHYRIN DIMERS SO JOURNAL OF THE AMERICAN CHEMICAL SOCIETY LA English DT Note ID PORPHYRIN DIMERS; CHEMISTRY; ORDER C1 USN ACAD,DEPT CHEM,ANNAPOLIS,MD 21402. RP COLLMAN, JP (reprint author), STANFORD UNIV,DEPT CHEM,STANFORD,CA 94305, USA. NR 16 TC 24 Z9 24 U1 0 U2 2 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0002-7863 J9 J AM CHEM SOC JI J. Am. Chem. Soc. PD OCT 6 PY 1993 VL 115 IS 20 BP 9309 EP 9310 DI 10.1021/ja00073a065 PG 2 WC Chemistry, Multidisciplinary SC Chemistry GA MC277 UT WOS:A1993MC27700065 ER PT J AU SHIRK, JS PONG, RGS BARTOLI, FJ SNOW, AW AF SHIRK, JS PONG, RGS BARTOLI, FJ SNOW, AW TI OPTICAL LIMITER USING A LEAD PHTHALOCYANINE SO APPLIED PHYSICS LETTERS LA English DT Article ID NONLINEARITIES AB The performance of an optical limiter based on Pb-tetrakis(cumylphenoxy)phthalocyanine, a robust organic material with a large chi(3) and figure of merit, chi(3)/alpha0, is described. In an f/5 limiter with a sample transmission of 0.68, the threshold for limiting was 8+/-2 nJ and the dynamic range was greater than a factor of 10(3) . The threshold for the PbPc(CP)4 limiter Was approximately 15 times smaller and the high intensity transmission approximately 4-5 times lower than an equivalent limiter based on a thermal nonlinearity. RP SHIRK, JS (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 17 TC 190 Z9 192 U1 3 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 OCT 4 PY 1993 VL 63 IS 14 BP 1880 EP 1882 DI 10.1063/1.110635 PG 3 WC Physics, Applied SC Physics GA MA200 UT WOS:A1993MA20000006 ER PT J AU CARRUTHERS, TF FRANKEL, MY KYONO, CS AF CARRUTHERS, TF FRANKEL, MY KYONO, CS TI ULTRAFAST PHOTODETECTION WITH AN ALINAS/GAINAS HETEROJUNCTION BIPOLAR-TRANSISTOR SO APPLIED PHYSICS LETTERS LA English DT Article AB Femtosecond visible-wavelength optical pulses were injected into unmodified AlInAs/GaInAs single-heterojunction bipolar transistors with current unity-gain frequencies of approximately 20 GHz. Emitter photocurrent transients as fast as 2.4 ps, corresponding to a photodetection bandwidth in excess of 200 GHz, were measured electro-optically. The responsivity was as high as 0.078 A/W at 620 nm. Slow photocurrent components due to photogenerated holes could be canceled with appropriate base biasing; measurements of the slow photocurrents provided information about the dynamics of carrier recombination in the base. RP CARRUTHERS, TF (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 8 TC 12 Z9 12 U1 0 U2 1 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0003-6951 J9 APPL PHYS LETT JI Appl. Phys. Lett. PD OCT 4 PY 1993 VL 63 IS 14 BP 1921 EP 1923 DI 10.1063/1.110649 PG 3 WC Physics, Applied SC Physics GA MA200 UT WOS:A1993MA20000020 ER PT J AU EHRLICH, AC AF EHRLICH, AC TI INFLUENCE OF INTRALAYER QUANTUM-WELL STATES ON THE GIANT MAGNETORESISTANCE IN MAGNETIC MULTILAYERS SO PHYSICAL REVIEW LETTERS LA English DT Article ID NONMAGNETIC METALLIC LAYER; VALENCE-ELECTRON STATES; TRANSPORT-PROPERTIES; FE/CR SUPERLATTICES; EXCHANGE; OSCILLATIONS; OVERLAYERS; CU(111); CR; FE AB A model which can account for the experimentally observed variations of the giant magnetoresistance in thin magnetic multilayers with mean free path, interface roughness, magnetic layer, and normal layer thickness has been developed. The model requires the existence of quantum-well states within individual layers or groups of layers, depending on the magnetic state of the film. The calculated results are obtained by the application of quantum size effect transport theory to these individual layers. RP EHRLICH, AC (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 33 TC 31 Z9 32 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 OCT 4 PY 1993 VL 71 IS 14 BP 2300 EP 2303 DI 10.1103/PhysRevLett.71.2300 PG 4 WC Physics, Multidisciplinary SC Physics GA MA027 UT WOS:A1993MA02700034 ER PT J AU OSOFSKY, MS SOULEN, RJ WOLF, SA BROTO, JM RAKOTO, H OUSSET, JC COFFE, G ASKENAZY, S PARI, P BOZOVIC, I ECKSTEIN, JN VIRSHUP, GF AF OSOFSKY, MS SOULEN, RJ WOLF, SA BROTO, JM RAKOTO, H OUSSET, JC COFFE, G ASKENAZY, S PARI, P BOZOVIC, I ECKSTEIN, JN VIRSHUP, GF TI ANOMALOUS TEMPERATURE-DEPENDENCE OF THE UPPER CRITICAL MAGNETIC-FIELD IN BI-SR-CU-O SO PHYSICAL REVIEW LETTERS LA English DT Article ID SUPERCONDUCTING PROPERTIES; SINGLE-CRYSTALS; CRITICAL FLUCTUATIONS; RESISTIVE TRANSITION; II SUPERCONDUCTORS; TC; SM1.85CE0.15CUO4-Y; SUPERLATTICES; INTERCALATION; LA2-XSRXCUO4 AB H(c2)(T) has been measured for thin BSCO films over a larger combined range of magnetic field and reduced temperature than for any other superconductor. H(c2)(T) diverged anomalously as the temperature decreased: At the lowest temperature, it was 5 times that expected for a conventional superconductor. Such a strong divergence cannot be explained by any conventional model. C1 SERV NATL CHAMPS MAGNET PULSES,F-31077 TOULOUSE,FRANCE. CTR ETUD SACLAY,SERV PHYS ETAT CONDENSE,BASSES TEMP LAB,F-91191 GIF SUR YVETTE,FRANCE. VARIAN ASSOCIATES INC,EDWARD L GINZTON RES CTR,PALO ALTO,CA 94304. RP OSOFSKY, MS (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. RI Wolf, Stuart/A-7513-2009; Osofsky, Michael/A-1050-2010 NR 52 TC 208 Z9 208 U1 1 U2 9 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0031-9007 J9 PHYS REV LETT JI Phys. Rev. Lett. PD OCT 4 PY 1993 VL 71 IS 14 BP 2315 EP 2318 DI 10.1103/PhysRevLett.71.2315 PG 4 WC Physics, Multidisciplinary SC Physics GA MA027 UT WOS:A1993MA02700038 ER PT J AU GATES, AA ACCORSI, ML AF GATES, AA ACCORSI, ML TI AUTOMATIC SHAPE OPTIMIZATION OF 3-DIMENSIONAL SHELL STRUCTURES WITH LARGE SHAPE CHANGES SO COMPUTERS & STRUCTURES LA English DT Article ID PLATE AB A finite element-based shape optimization program has been developed for three-dimensional shell structures which allows for large shape changes. The new shape optimization program has been achieved by linking together adaptive mesh generation, substructuring, and linear and nonlinear optimization techniques to a commercial finite element analysis program (MSC/NASTRAN). The program has the capability of optimizing shapes by allowing multiple edges to move. A new procedure was developed to determine the best edge to move at each iteration of the shape optimization. The position of this edge is then determined using nonlinear optimization techniques. This process is incrementally continued until the edges are at their minimum positions, or the change in objective function is less than a tolerance value. This program is presently being applied to weight minimization. C1 UNIV CONNECTICUT,DEPT CIVIL ENGN,STORRS,CT 06269. RP GATES, AA (reprint author), USN,CTR UNDERWATER SYST,CODE 412,BLDG 96,RM A02,NEW LONDON,CT 06320, USA. NR 8 TC 21 Z9 22 U1 0 U2 2 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0045-7949 J9 COMPUT STRUCT JI Comput. Struct. PD OCT 3 PY 1993 VL 49 IS 1 BP 167 EP 178 DI 10.1016/0045-7949(93)90135-Z PG 12 WC Computer Science, Interdisciplinary Applications; Engineering, Civil SC Computer Science; Engineering GA MJ787 UT WOS:A1993MJ78700014 ER PT J AU BERNHARDT, PA AF BERNHARDT, PA TI PROCEEDINGS OF THE TOPICAL MEETING OF THE COSPAR INTERDISCIPLINARY SCIENTIFIC COMMISSION-D (MEETINGS D5 AND D7) OF THE COSPAR 29TH PLENARY MEETING HELD IN WASHINGTON, DC, USA, 28 AUGUST 5 SEPTEMBER, 1992 - PREFACE SO ADVANCES IN SPACE RESEARCH-SERIES LA English DT Editorial Material RP USN, RES LAB, DIV PLASMA PHYS, WASHINGTON, DC 20375 USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU ELSEVIER SCI LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, OXON, ENGLAND SN 0273-1177 J9 ADV SPACE RES-SERIES JI Adv. Space Res. PD OCT PY 1993 VL 13 IS 10 BP 3 EP 4 PG 2 WC Astronomy & Astrophysics; Geosciences, Multidisciplinary; Meteorology & Atmospheric Sciences SC Astronomy & Astrophysics; Geology; Meteorology & Atmospheric Sciences GA ML874 UT WOS:A1993ML87400001 ER PT J AU HUBA, JD BERNHARDT, PA FEDDER, JA LYON, JG MITCHELL, HG AF HUBA, JD BERNHARDT, PA FEDDER, JA LYON, JG MITCHELL, HG TI MODELING THE PLASMA DYNAMICS OF THE CRRES G-9 AND G-10 BARIUM RELEASES SO ADVANCES IN SPACE RESEARCH-SERIES LA English DT Article ID ION CLOUDS; MAGNETOSPHERE; IONOSPHERE; MOTION; MODES AB The CRRES mission involved a number of chemical releases in the ionosphere and magnetosphere to study a multitude of scientific phenomena. In this paper two releases are discussed: the G-9 release and the G-10 release. One of the primary purposes of the G-9 release was to study the transverse motion (i.e., 'skidding') of plasma across magnetic field lines. Analysis of optical images indicates that the barium cloud 'skidded' approximately 9 - 15 km. The simulation study is based upon a 2D electrostatic code which incorporates a time-dependent model of coupling to the background ionosphere. The simulation results indicate the densest portion of the barium cloud 'skids' approximately 15 km within the first 3 sec following the release, consistent with observations. The G-10 release was designed to study, in part, the formation and evolution of a diamagnetic cavity, as well as the stability of the barium plasma. The simulation results are obtained from a 2D Hall MHD code and show that (1) the plasma and field structure at time t less-than-or-equal-to 22 sec, and develop scale sizes approximately 10 - 15 km, and (2) the structuring of the plasma allows 'blobs' of plasma to drift across the magnetic field. These results are consistent with optical and in situ magnetometer measurements. C1 UNIV IOWA, IOWA CITY, IA 52242 USA. NASA, GODDARD SPACE FLIGHT CTR, GREENBELT, MD 20771 USA. RP USN, RES LAB, DIV PLASMA PHYS, WASHINGTON, DC 20375 USA. NR 27 TC 1 Z9 1 U1 1 U2 1 PU ELSEVIER SCI LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, OXON, ENGLAND SN 0273-1177 J9 ADV SPACE RES-SERIES JI Adv. Space Res. PD OCT PY 1993 VL 13 IS 10 BP 45 EP 54 PG 10 WC Astronomy & Astrophysics; Geosciences, Multidisciplinary; Meteorology & Atmospheric Sciences SC Astronomy & Astrophysics; Geology; Meteorology & Atmospheric Sciences GA ML874 UT WOS:A1993ML87400006 ER PT J AU SYMONDS, CL AF SYMONDS, CL TI THE CONFEDERACYS FIGHTING CHAPLAIN - BANNON,JOHN,B - TUCKER,PT SO AMERICAN HISTORICAL REVIEW LA English DT Book Review RP SYMONDS, CL (reprint author), USN ACAD,ANNAPOLIS,MD 21402, USA. NR 1 TC 0 Z9 0 U1 0 U2 0 PU AMER HISTORICAL REVIEW PI WASHINGTON PA 400 A ST SE, WASHINGTON, DC 20003 SN 0002-8762 J9 AM HIST REV JI Am. Hist. Rev. PD OCT PY 1993 VL 98 IS 4 BP 1323 EP 1323 DI 10.2307/2166780 PG 1 WC History SC History GA MD568 UT WOS:A1993MD56800169 ER PT J AU WYMAN, J PITZER, E WILLIAMS, F RIVERA, J DURKIN, A GEHRINGER, J SERVE, P VONMINDEN, D MACYS, D AF WYMAN, J PITZER, E WILLIAMS, F RIVERA, J DURKIN, A GEHRINGER, J SERVE, P VONMINDEN, D MACYS, D TI EVALUATION OF SHIPBOARD FORMATION OF A NEUROTOXICANT (TRIMETHYLOLPROPANE PHOSPHATE) FROM THERMAL-DECOMPOSITION OF SYNTHETIC AIRCRAFT ENGINE LUBRICANT SO AMERICAN INDUSTRIAL HYGIENE ASSOCIATION JOURNAL LA English DT Article ID TOXICITY AB MIL-L-23699 lubricants that are composed principally of trimethylolpropane triheptanoate (TMP) and tricresyl phosphate (TCP) have been shown to form a neurotoxicant, trimethylolpropane phosphate (TMPP), during pyrolysis and/or combustion. Mechanistically, TMPP is thought to irreversibly inhibit the GABA-mediated inhibitory response and thereby produce epileptiform clonic/tonic seizures with convulsions followed by death. Thermal decomposition of MIL-L-23699 lubricant produces TMPP under laboratory conditions, but this product has not been detected in the workplace following actual fires. This study has examined whether TMPP is produced during an actual shipboard fire by placing the synthetic lubricant in a fire environment aboard the ex-U.S.S. Shadwell, Mobile, Alabama. Both biological and chemical analyses were performed on the thermally decomposed lubricant to ensure detection of the neurotoxic material. Under the conditions of this study, the formation of TMPP during a shipboard fire was confirmed. The implications of this finding for safe management of post-fire cleanup are discussed. C1 WRIGHT LAB,AERO PROPULS & POWER DIRECTORATE,LUBRICAT BRANCH,WRIGHT PATTERSON AFB,OH. USN,TECHNOL CTR SAFETY & SURVIVABIL,DIV CHEM,RES LAB,WASHINGTON,DC 20350. WRIGHT STATE UNIV,DEPT CHEM,DAYTON,OH 45435. RP WYMAN, J (reprint author), USN,MED RES INST DETACHMENT TOXICOL,BLDG 433,AREA B,2612 5TH ST,WRIGHT PATTERSON AFB,OH 45433, USA. NR 16 TC 20 Z9 20 U1 0 U2 4 PU AMER INDUSTRIAL HYGIENE ASSOC PI FAIRFAX PA 2700 PROSPERITY AVE #250, FAIRFAX, VA 22031-4307 SN 0002-8894 J9 AM IND HYG ASSOC J JI Am. Ind. Hyg. Assoc. J. PD OCT PY 1993 VL 54 IS 10 BP 584 EP 592 DI 10.1202/0002-8894(1993)054<0584:EOSFOA>2.0.CO;2 PG 9 WC Environmental Sciences; Public, Environmental & Occupational Health SC Environmental Sciences & Ecology; Public, Environmental & Occupational Health GA MK760 UT WOS:A1993MK76000006 PM 8237791 ER PT J AU CAVALLARO, MC TAYLOR, JAM GORMAN, JD HAGHIGHI, P RESNICK, D AF CAVALLARO, MC TAYLOR, JAM GORMAN, JD HAGHIGHI, P RESNICK, D TI IMAGING FINDINGS IN A PATIENT WITH FIBROLIPOMATOUS HAMARTOMA OF THE MEDIAN NERVE SO AMERICAN JOURNAL OF ROENTGENOLOGY LA English DT Note C1 VET AFFAIRS MED CTR,DEPT RADIOL,3350 LA JOLLA VILLAGE DR,SAN DIEGO,CA 92161. UNIV CALIF SAN DIEGO,MED CTR,SAN DIEGO,CA 92103. USN HOSP,DEPT RADIOL,SAN DIEGO,CA 92134. NR 7 TC 44 Z9 45 U1 0 U2 0 PU AMER ROENTGEN RAY SOC PI RESTON PA 1891 PRESTON WHITE DR, SUBSCRIPTION FULFILLMENT, RESTON, VA 22091 SN 0361-803X J9 AM J ROENTGENOL JI Am. J. Roentgenol. PD OCT PY 1993 VL 161 IS 4 BP 837 EP 838 PG 2 WC Radiology, Nuclear Medicine & Medical Imaging SC Radiology, Nuclear Medicine & Medical Imaging GA MG651 UT WOS:A1993MG65100031 PM 8372770 ER PT J AU BELLI, SL ZIRINO, A AF BELLI, SL ZIRINO, A TI BEHAVIOR AND CALIBRATION OF THE COPPER(II) ION-SELECTIVE ELECTRODE IN HIGH CHLORIDE MEDIA AND MARINE WATERS SO ANALYTICAL CHEMISTRY LA English DT Article ID EQUILIBRIUM SPECIATION; SEAWATER; 25-DEGREES-C; MODEL; COMPLEXATION; PRESSURE; LEAD AB The response of the solid-state Cu(II) ion-selective electrode in high chloride media was investigated and found to be Nernstian under normal laboratory and field measurement conditions. The previously reported ''non-Nernstian'' behavior has been identified as a combination of electrode fouling, due to specific storage and measurement conditions, and the action of stoichiometric levels of a Lewis base on the standard addition method of electrode calibration. Electrode calibration by external Cu(II) activity buffers in artificial seawater is described. The copper activity of the buffers is calculated from an ion-interaction model, and the electrode response in these buffers is shown to be consistent with that in chloride solutions over 10 orders of magnitude copper concentration and from pH 8 to 2. C1 VASSAR COLL,DEPT CHEM,POUGHKEEPSIE,NY 12601. RP BELLI, SL (reprint author), USN,CTR CONTROL & OCEAN SURVEILLANCE,NAVAL COMMAND,DIV RDT & E,SAN DIEGO,CA 92152, USA. NR 18 TC 62 Z9 63 U1 1 U2 8 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0003-2700 J9 ANAL CHEM JI Anal. Chem. PD OCT 1 PY 1993 VL 65 IS 19 BP 2583 EP 2589 DI 10.1021/ac00067a007 PG 7 WC Chemistry, Analytical SC Chemistry GA LZ670 UT WOS:A1993LZ67000010 ER PT J AU HULLANDER, RM LEIVERS, D WINGLER, K AF HULLANDER, RM LEIVERS, D WINGLER, K TI A COMPARISON OF PROPOFOL AND ETOMIDATE FOR CARDIOVERSION SO ANESTHESIA AND ANALGESIA LA English DT Article ID ELDERLY PATIENTS; ANESTHESIA; THIOPENTONE; INDUCTION; INFUSION AB Bolus doses of propofol in patients for cardioversion often produce hypotension and apnea. Etomidate provides cardiovascular stability in these patients, but myoclonus may interfere with electrocardiographic interpretation. This study was designed to demonstrate whether propofol, when given as a low-dose infusion, can attain etomidate's hemodynamic stability without its attendant side, effects. Forty consenting patients were randomly assigned to receive either propofol infusion (50 mg/min) for induction of anesthesia followed by a maintenance infusion (100 mug-kg-1.min-1) or etomidate (8 mg/min and 20 mug.kg-1.min-1). Calculation of loading infusion rates for propofol and etomidate resulted in averages of 0.64 mg-kg-1.min-1 (range, 0.39-1.04) and 0.09 mg-kg-1.min-1 (range, 0.05-0.14), respectively. Induction times (2.2 min) and the times from terminating drug administration to awake states (4.5 min) were similar for each group. Etomidate produced myoclonus in 45% of the patients; otherwise side effects were minimal, with no significant differences between groups. The means of systolic blood pressures in the etomidate group rose a maximum of 15.3 +/- 7.9% (95% confidence), while a modest decrease of 7.2 +/- 7.3% occurred with propofol. Administration of propofol by infusion for cardioversion retains all its beneficial qualities while attenuating its hypotensive effects, making it a suitable choice for these patients with cardiac arrhythmias. C1 USN HOSP,DEPT ANESTHESIOL,SAN DIEGO,CA 92134. RP HULLANDER, RM (reprint author), USN HOSP,DEPT CLIN INVEST,SAN DIEGO,CA 92134, USA. NR 18 TC 33 Z9 34 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 OCT PY 1993 VL 77 IS 4 BP 690 EP 695 PG 6 WC Anesthesiology SC Anesthesiology GA MA357 UT WOS:A1993MA35700006 PM 8214650 ER PT J AU SIMPSON, R ALON, R KOBZIK, L VALERI, R SHEPRO, D HECHTMAN, HB AF SIMPSON, R ALON, R KOBZIK, L VALERI, R SHEPRO, D HECHTMAN, HB TI NEUTROPHIL AND NONNEUTROPHIL-MEDIATED INJURY IN INTESTINAL ISCHEMIA-REPERFUSION SO ANNALS OF SURGERY LA English DT Article; Proceedings Paper CT 113TH ANNUAL SCIENTIFIC SESSION OF THE AMERICAN-SURGICAL-ASSOC CY APR 01-03, 1993 CL BALTIMORE, MD SP AMER SURG ASSOC ID TUMOR-NECROSIS-FACTOR; ACUTE LUNG INJURY; LEUKOCYTE PROTEASE INHIBITOR; COMPLEMENT RECEPTOR TYPE-1; PLATELET-ACTIVATING FACTOR; LOWER TORSO ISCHEMIA; MICROVASCULAR INJURY; VONWILLEBRAND-FACTOR; MESENTERIC ISCHEMIA; ESCHERICHIA-COLI AB Objective The role of polymorphonuclear neutrophils (PMN) was examined in local and remote organ injury after intestinal ischemia-reperfusion. Summary Background Data PMN have been found to mediate the local injury in low flow intestinal ischemia-reperfusion. However, in complete intestinal ischemia-reperfusion, prevention of PMN adhesion by monoclonal antibodies to CD11b and CD18 reduces remote but not local intestinal injury. The role of PMN was further investigated in this setting. Methods In a rat model of 1-hour complete intestinal ischemia and 4-hour reperfusion, PMN were manipulated in the following four ways: (1) inhibition of oxygen-free radicals using manganese superoxide dismutase and catalase (SOD/CAT), (2) antagonism of PMN elastase using secretory leukocyte protease inhibitor (SLPI), (3) neutropenia using PMN antisera, and (4) inhibition of activation and adhesion using interleukin-1 receptor antagonist (IL-1 ra) and tumor necrosis factor binding protein (TNFbp). Lung injury was quantified by the pulmonary permeability index, which is the ratio of bronchoalveolar lavage to blood concentration of radiolabeled bovine serum albumin, and PMN sequestration by myeloperoxidase (MPO) activity. Liver injury was estimated by PMN counts using quantitative histologic examination and by serum glutamic pyruvic transaminase (SGPT). Local injury was quantified by MPO activity and histologic grading. Results Neutropenia reduced the pulmonary permeability 80% from 11.0 +/- 0.5 x 10(-3) with saline treatment to 5.50 +/- 0.12 x 10(-3); IL-1ra, to 5.62 +/- 0.44 x 10(-3); and TNFbp, to 4.32 +/- 0.18 x 10(-3) (all p < 0.05). Pulmonary MPO rose from 0.03 +/- 0.01 U/g to 0.25 +/- 0.03 U/g (p < 0.05). This was reduced by neutropenia, 0.01 +/- 0.003 U/g, but not by inhibition of oxygen-free radicals or PMN elastase. IL-1ra inhibited PMN sequestration, reducing MPO to 0.12 +/- 0.01 (p < 0.05). Liver injury was 60% dependent on PMN. Ischemia-reperfusion increased SGPT from 20.3 +/- 0.7 IU/L in the sham-treated animals to 97.0 +/- 3.1 IU/L in the experimental animals. Neutropenia reduced this to 48.1 +/- 3.9 IU/L; IL-1ra, to 44.7 +/- 3.7 IU/L; SOD/CAT, to 64.0 +/- 3.38 IU/L; and SLPI, to 57.1 +/- 3.4 IU/L (p < 0.05 in all cases). Local injury was severe and unaffected by manipulation of the PMN. Conclusions These data suggest that PMN and their products mediate most of the lung, part of the liver, and none of the local gut injury after intestinal ischemia-reperfusion. C1 USN,BLOOD RES LAB,BOSTON,MA. BRIGHAM & WOMENS HOSP,DEPT PATHOL,BOSTON,MA 02115. BOSTON UNIV,CTR BIOL SCI,BOSTON,MA 02215. HARVARD UNIV,SCH MED,BOSTON,MA 02115. RP SIMPSON, R (reprint author), BRIGHAM & WOMENS HOSP,DEPT SURG,BOSTON,MA 02115, USA. FU NHLBI NIH HHS [HL43875-02]; NIGMS NIH HHS [GM24891-14, GM35141-06] NR 52 TC 198 Z9 204 U1 0 U2 2 PU LIPPINCOTT-RAVEN PUBL PI PHILADELPHIA PA 227 EAST WASHINGTON SQ, PHILADELPHIA, PA 19106 SN 0003-4932 J9 ANN SURG JI Ann. Surg. PD OCT PY 1993 VL 218 IS 4 BP 444 EP 454 DI 10.1097/00000658-199310000-00005 PG 11 WC Surgery SC Surgery GA MB500 UT WOS:A1993MB50000004 PM 8215636 ER PT J AU KRISTIAN, J GROTH, EJ SHAYA, EJ SCHNEIDER, DP HOLTZMAN, JA BAUM, WA CAMPBELL, B CODE, A CURRIE, DG DANIELSON, GE EWALD, SP HESTER, JJ LIGHT, RM LYNDS, CR ONEIL, EJ SEIDELMANN, PK WESTPHAL, JA AF KRISTIAN, J GROTH, EJ SHAYA, EJ SCHNEIDER, DP HOLTZMAN, JA BAUM, WA CAMPBELL, B CODE, A CURRIE, DG DANIELSON, GE EWALD, SP HESTER, JJ LIGHT, RM LYNDS, CR ONEIL, EJ SEIDELMANN, PK WESTPHAL, JA TI IMAGING OF THE GRAVITATIONAL LENS SYSTEM PG 1115+080 WITH THE HUBBLE-SPACE-TELESCOPE SO ASTRONOMICAL JOURNAL LA English DT Article ID FIELD PLANETARY CAMERA; QSO PG1115+08; TRIPLE QUASAR; GALAXY AB This paper is the first of a series presenting observations of gravitational lenses and lens candidates, taken with the Wide Field/Planetary Camera (WFPC) of the Hubble Space Telescope (HST). We have resolved the gravitational lens system PG 1115 + 080 into four point sources and a red, extended object that is presumably the lens galaxy; we present accurate relative intensities, colors, and positions of the four images, and lower accuracy intensity and position of the lens galaxy, all at the epoch 1991.2. Comparison with earlier data shows no compelling evidence for relative intensity variations between the QSO components having so far been observed. The new data agree with earlier conclusions that the system is rather simple, and can be produced by the single observed galaxy. The absence of asymmetry in the HST images implies that the emitting region of the quasar itself has an angular radius smaller than about 10 milliarcsec (100 pc for H-0=50, q0=0.5). C1 PRINCETON UNIV,DEPT PHYS,POB 708,PRINCETON,NJ 08544. UNIV MARYLAND,DEPT PHYS & ASTRON,COLL PK,MD 20742. INST ADV STUDIES,SCH NAT SCI,PRINCETON,NJ 08540. LOWELL OBSERV,FLAGSTAFF,AZ 86001. UNIV WASHINGTON,DEPT ASTRON,SEATTLE,WA 98195. UNIV NEW MEXICO,DEPT PHYS & ASTRON,ALBUQUERQUE,NM 87131. UNIV WISCONSIN,WASHBURN OBSERV,MADISON,WI 53706. CALTECH,DIV GEOL & PLANETARY SCI,PASADENA,CA 91125. SPACE TELESCOPE SCI INST,BALTIMORE,MD 21218. ARIZONA STATE UNIV,DEPT PHYS & ASTRON,TEMPE,AZ 85287. CALTECH,CTR INFRARED PROC & ANAL,PASADENA,CA 91125. NATL OPT ASTRON OBSERV,TUCSON,AZ 85726. USN OBSERV,NAUT ALMANAC OFF,WASHINGTON,DC 20392. RP KRISTIAN, J (reprint author), CARNEGIE INST WASHINGTON,OBSERV,813 SANTA BARBARA ST,PASADENA,CA 91101, USA. NR 14 TC 32 Z9 32 U1 0 U2 0 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0004-6256 J9 ASTRON J JI Astron. J. PD OCT PY 1993 VL 106 IS 4 BP 1330 EP 1336 DI 10.1086/116729 PG 7 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA LZ183 UT WOS:A1993LZ18300006 ER PT J AU VRBA, FJ CHUGAINOV, PF WEAVER, WB STAUFFER, JS AF VRBA, FJ CHUGAINOV, PF WEAVER, WB STAUFFER, JS TI PHOTOMETRIC AND SPECTROSCOPIC MONITORING OF AA TAU, DN TAU, UX TAU-A, T-TAU, RY TAU, LK CA-4, AND LK CA-7 SO ASTRONOMICAL JOURNAL LA English DT Article ID ORION-POPULATION STARS; MAIN-SEQUENCE STARS; LIGHT VARIABILITY; ROTATION; EMISSION; SPOTS; VARIABLES; OBJECTS; AURIGA; CO AB We report the results of a UBVRI Photometric monitoring campaign for three classical T Tauri stars (AA Tau, DN Tau, and UX Tau A) and two weak emission line T Tauri stars (Lk Ca 4 and Lk Ca 7). Observations were obtained at three sites during a core observing period spanning UT 1985 October 14 through UT 1985 December 25, with additional observations continuing until UT 1986 April 6. Concurrent spectrophotometric observations were obtained for all main program stars except Lk Ca 7 and additionally for T Tau, RW Aur, and RY Tau. Periodic photometric variability, assumed to be the stars' rotation periods, were found for AA Tau, DN Tau, Lk Ca 4, and Lk Ca 7, respectively, as 8.2, 6.3, 3.4, and 5.7 days. Several U-filter flares were observed for Lk Ca 4 and Lk Ca 7, which are strongly concentrated toward phases of minimum light. We find that there are no correlations between the strengths of Halpha, Hbeta, or Hgamma and V magnitude or phase for T Tau. However, we do find correlations between Halpha line strengths and V magnitudes for AA Tau and RY Tau. An analysis of absolute color variations of classical T Tauri stars confirms that hot spots are the predominant cause of these stars' variability. This is supported by the spectrophotometric results which show a strong correlation of the amplitude of variation of Halpha equivalent width with photometric amplitude of variability for classical T Tauri stars. Our overall results are consistent with earlier findings that long-lived cool spots are responsible for most of the variability found for weak-emission T Tauri stars, while temporal hot spots are primarily responsible for the observed variability found in classical T Tauri stars. C1 CRIMEAN ASTROPHYS OBSERV,CRIMEA 334413,RUSSIA. MONTEREY INST RES ASTRON,MONTEREY,CA 93940. CTR ASTROPHYS,CAMBRIDGE,MA 02138. RP VRBA, FJ (reprint author), USN OBSERV,FLAGSTAFF STN,POB 1149,FLAGSTAFF,AZ 86002, USA. NR 45 TC 55 Z9 56 U1 0 U2 0 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0004-6256 J9 ASTRON J JI Astron. J. PD OCT PY 1993 VL 106 IS 4 BP 1608 EP 1626 DI 10.1086/116751 PG 19 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA LZ183 UT WOS:A1993LZ18300028 ER PT J AU KENNEDY, RS FOWLKES, JE LILIENTHAL, MG AF KENNEDY, RS FOWLKES, JE LILIENTHAL, MG TI POSTURAL AND PERFORMANCE CHANGES FOLLOWING EXPOSURES TO FLIGHT SIMULATORS SO AVIATION SPACE AND ENVIRONMENTAL MEDICINE LA English DT Article ID EQUILIBRIUM TESTS; SICKNESS AB Flight simulators are cost-effective, safe, and flexible training tools for aviators. However, their advantages may be offset by the occurrence of motion sickness-like symptoms which have been reported during and following simulator training. Although symptoms have been well documented in simulators, their time course, causes, and implications for training are not yet fully understood. Tests of standing and walking steadiness were administered along with cognitive and motor performance tests to Navy and Marine Corps aviators before and after their regular simulator training, resulting in records of 726 pilot exposure observations. When exposed pilots were compared to a control group who did not fly in a simulator, statistically significant decrements in postural equilibrium test scores were found for all of the moving base simulators, but for only one of the three fixed-base simulators. The size of these losses was approximately 15% of baseline. Cognitive and motor changes, while statistically significant, were complicated by learning effects in all groups for all tests. When compared to the control group, improvement in cognitive scores was always less in the simulator groups, but greater improvement occurred in the simulator groups for motor speed scores, although this latter difference was small (<1% of baseline). Further study of performance changes is recommended. In those simulators where significant effects occurred, the ataxia and the time-course of the disequilibrium should be followed. C1 ENZIAN TECHNOL,ORLANDO,FL. USN,DEF MODELING SIMULAT OFF,ALEXANDRIA,VA. RP KENNEDY, RS (reprint author), ESSEX CORP,1040 WOODCOCK RD,SUITE 227,ORLANDO,FL 32803, USA. NR 29 TC 35 Z9 36 U1 0 U2 2 PU AEROSPACE MEDICAL ASSOC PI ALEXANDRIA PA 320 S HENRY ST, ALEXANDRIA, VA 22314-3579 SN 0095-6562 J9 AVIAT SPACE ENVIR MD JI Aviat. Space Environ. Med. PD OCT PY 1993 VL 64 IS 10 BP 912 EP 920 PG 9 WC Public, Environmental & Occupational Health; Medicine, General & Internal; Sport Sciences SC Public, Environmental & Occupational Health; General & Internal Medicine; Sport Sciences GA MA049 UT WOS:A1993MA04900005 PM 8240195 ER PT J AU WHINNERY, JE SHENDER, BS AF WHINNERY, JE SHENDER, BS TI THE OPTICOGRAVIC NERVE - EYE-LEVEL ANATOMIC RELATIONSHIPS WITHIN THE CENTRAL-NERVOUS-SYSTEM SO AVIATION SPACE AND ENVIRONMENTAL MEDICINE LA English DT Note AB The anatomic relationships between arterial blood supply and key structures within the central nervous system (CNS) are important in comprehending the neurophysiological effects of acceleration (+Gz) stress, including +Gz-induced loss of consciousness (G-LOC). An accurate understanding of the location of the vascular and neurologic structures at eye-level is vital, since it is possible to determine precisely when visual symptoms occur. Cerebral perfusion is supported by the pressure-equalizing effects provided by the cerebrospinal fluid. While brain and brain stem are protected by this pressure compensation, the eye is not. Decreased visual function results when retinal perfusion is compromised. G-LOC generally occurs following loss of visual function. The exact location(s) of altered perfusion within the CNS that results in G-LOC is currently unknown. To thoroughly understand G-LOC, it will be necessary to understand which CNS structures must be affected by +Gz-induced ischemia to cause G-LOC. Based on previous theoretical considerations of loss of consciousness as a protective mechanism, it is possible to consider the eye (visual system) as a dual sensor for both vision and gravitational (acceleration) stress. Due to this expanded definition of the sensory functions of the second cranial nerve, it would therefore be more appropriate to describe it as the ''opticogravic'' nerve. This manuscript discusses some of these considerations and the eye-level neuroanatomic relationships of vital importance for the acceleration medical subspecialist. C1 USN,CTR AIR WARFARE,DIV AIRCRAFT,AERIAL COMBAT MANEUVERING ENHANCEMENT LAB,POB 5152,CODE 6023,WARMINSTER,PA 18974. NATL GUARD BUR,WASHINGTON,DC. NR 11 TC 3 Z9 3 U1 0 U2 0 PU AEROSPACE MEDICAL ASSOC PI ALEXANDRIA PA 320 S HENRY ST, ALEXANDRIA, VA 22314-3579 SN 0095-6562 J9 AVIAT SPACE ENVIR MD JI Aviat. Space Environ. Med. PD OCT PY 1993 VL 64 IS 10 BP 952 EP 954 PG 3 WC Public, Environmental & Occupational Health; Medicine, General & Internal; Sport Sciences SC Public, Environmental & Occupational Health; General & Internal Medicine; Sport Sciences GA MA049 UT WOS:A1993MA04900012 PM 8240202 ER PT J AU BODINE, DM MORITZ, T DONAHUE, RE LUSKEY, BD KESSLER, SW MARTIN, DIK ORKIN, SH NIENHUIS, AW WILLIAMS, DA AF BODINE, DM MORITZ, T DONAHUE, RE LUSKEY, BD KESSLER, SW MARTIN, DIK ORKIN, SH NIENHUIS, AW WILLIAMS, DA TI LONG-TERM IN-VIVO EXPRESSION OF A MURINE ADENOSINE-DEAMINASE GENE IN RHESUS-MONKEY HEMATOPOIETIC-CELLS OF MULTIPLE LINEAGES AFTER RETROVIRAL-MEDIATED GENE-TRANSFER INTO CD34+ BONE-MARROW CELLS SO BLOOD LA English DT Note ID STEM-CELLS; DEFICIENCY; CULTURE; TRANSPLANTATION; THERAPY; MICE; VECTORS; SAFE C1 INDIANA UNIV,SCH MED,HOWARD HUGHES MED INST,HERMAN B WELLS CTR PEDIAT RES,INDIANAPOLIS,IN 46202. USN,MED RES INST,IMMUNE CELL BIOL PROGRAM,BETHESDA,MD 20814. HARVARD UNIV,CHILDRENS HOSP,SCH MED,BOSTON,MA 02115. RP BODINE, DM (reprint author), NHLBI,CLIN HEMATOL BRANCH,NIH BLDG 10,ROOM 7C103,9000 ROCKVILLE PIKE,BETHESDA,MD 20892, USA. FU NHLBI NIH HHS [5 RO1-HL46528-03] NR 34 TC 191 Z9 191 U1 0 U2 2 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 OCT 1 PY 1993 VL 82 IS 7 BP 1975 EP 1980 PG 6 WC Hematology SC Hematology GA MA663 UT WOS:A1993MA66300006 PM 7691243 ER PT J AU SCHOEN, PE PRICE, RR SCHNUR, JM GULIK, A GULIKKRZYWICKI, T AF SCHOEN, PE PRICE, RR SCHNUR, JM GULIK, A GULIKKRZYWICKI, T TI FORMATION OF LIPID TUBULE MICROSTRUCTURES - TIME-RESOLVED FREEZE-FRACTURE ELECTRON-MICROSCOPY AND X-RAY CHARACTERIZATION SO CHEMISTRY AND PHYSICS OF LIPIDS LA English DT Article DE TUBULES; DIACETYLENIC PHOSPHOLIPIDS; FREEZE FRACTURE; ELECTRON MICROSCOPY; X-RAY SCATTERING; PHASE TRANSITIONS ID BILAYERS; PHOSPHATIDYLCHOLINES; DIFFRACTION; ISOMERS; WATER AB The tubule-forming lipid 1,2-bis (10,12-tricosadiynoyl)-sn-glycero-3-phosphocholine has been dispersed in water as a suspension of large vesicles. The temperature of the dispersion was dropped in small steps from 45-degrees-C to 37-degrees-C, and at each step aliquots of the sample were flash-frozen in liquid propane for freeze-fracture replication. In this temperature range most of the vesicles collapse, losing their internal water, and transform to tubules. The vesicles display surface roughness at 43-degrees-C, which becomes interspersed with smooth regions at 40-degrees-C. At 37-degrees-C the smooth areas appear to become predominant and the vesicles roll themselves up into the hollow cylindrical form of tubules. This process is partly reversible, since rewarming this preparation to 50-degrees-C leads to reformation of vesicles that display some surface roughness. Low and wide-angle X-ray scattering was used to follow the disorder-order lipid hydrocarbon chain transition on cooling for samples prepared with tightly packed tubules (centrifugation pellet) or highly concentrated lipid-water lamellar phases. In both cases the transition started at about 40-degrees-C, being rapidly achieved in the case of the tubule pellet but showing coexistence for several days at room temperature of disordered and ordered lipid in the case of the lamellar sample. C1 CNR,CTR MOLEC GENET,F-91198 GIF SUR YVETTE,FRANCE. RP SCHOEN, PE (reprint author), USN,RES LAB,CTR BIOMOLEC SCI & ENGN,CODE 6090,WASHINGTON,DC 20375, USA. NR 26 TC 11 Z9 11 U1 0 U2 6 PU ELSEVIER SCI IRELAND LTD PI CLARE PA CUSTOMER RELATIONS MANAGER, BAY 15, SHANNON INDUSTRIAL ESTATE CO, CLARE, IRELAND SN 0009-3084 J9 CHEM PHYS LIPIDS JI Chem. Phys. Lipids PD OCT PY 1993 VL 65 IS 3 BP 179 EP 191 DI 10.1016/0009-3084(93)90016-V PG 13 WC Biochemistry & Molecular Biology; Biophysics SC Biochemistry & Molecular Biology; Biophysics GA ME050 UT WOS:A1993ME05000002 ER PT J AU GARCIA, J KHAIT, I LIM, C TANTILLO, M DOURSOUNIAN, M ZOLKEWITZ, M VALERI, CR KHURI, SF AF GARCIA, J KHAIT, I LIM, C TANTILLO, M DOURSOUNIAN, M ZOLKEWITZ, M VALERI, CR KHURI, SF TI A P-31 NMR-STUDY OF MYOCARDIAL-METABOLISM IN ISCHEMIA AND REPERFUSION DURING NORMOTHERMIC AND HYPOTHERMIC CARDIOPULMONARY BYPASS SO CIRCULATION LA English DT Meeting Abstract C1 VET ADM MED CTR W ROXBURY,USN,BLOOD RES LAB,BOSTON,MA 02132. BRIGHAM & WOMENS HOSP,BOSTON,MA 02115. HARVARD UNIV,SCH MED,BOSTON,MA 02115. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER HEART ASSOC PI DALLAS PA 7272 GREENVILLE AVENUE, DALLAS, TX 75231-4596 SN 0009-7322 J9 CIRCULATION JI Circulation PD OCT PY 1993 VL 88 IS 4 BP 530 EP 530 PN 2 PG 1 WC Cardiac & Cardiovascular Systems; Peripheral Vascular Disease SC Cardiovascular System & Cardiology GA MA682 UT WOS:A1993MA68202889 ER PT J AU LEFEBVRE, MH ORAN, ES KAILASANATH, K VANTIGGELEN, PJ AF LEFEBVRE, MH ORAN, ES KAILASANATH, K VANTIGGELEN, PJ TI THE INFLUENCE OF THE HEAT-CAPACITY AND DILUENT ON DETONATION STRUCTURE SO COMBUSTION AND FLAME LA English DT Article AB In this article, we investigate the validity of certain common simplifications in the chemical and thermophysical models used as input to multidimensional detonation simulations, derive a more accurate model, and apply the model in two-dimensional studies of the structure detonations in hydrogen-oxygen mixtures diluted with argon and nitrogen. In a series of one-dimensional calculations, we examine the effects of (1) approximation of the temperature dependence of the ratio of specific heat, gamma, (2) varying the amount and rate of heat release, and (3) varying the chemical induction time, and we compare all of these approximations with a computation that uses a detailed model of the chemical kinetics and correct thermophysics. From these, we derive a simple form for the temperature dependence of gamma and show that this gives good results in comparison to the predictions of the detailed calculation for the detonation velocity and the thickness of the induction zone. In a series of two-dimensional calculations, we investigate the effects of using the more accurate simplified chemical models and varying the type of diluent while maintaining the same dilutions. In agreement with experiments, the mixture of hydrogen, oxygen, and argon mixture shows regular detonation structures and clearly formed detonation cells, whereas the mixture of hydrogen, oxygen, and nitrogen shows highly irregular cellular structure. C1 USN,RES LAB,COMPUTAT PHYS & FLUID DYNAM LAB,CODE 6404,WASHINGTON,DC 20375. ROYAL MIL ACAD,DEPT CHEM,B-1040 BRUSSELS,BELGIUM. UNIV CATHOLIQUE LOUVAIN,PHYS CHIM COMBUST LAB,B-1348 LOUVAIN,BELGIUM. NR 16 TC 21 Z9 22 U1 1 U2 3 PU ELSEVIER SCIENCE INC PI NEW YORK PA 655 AVENUE OF THE AMERICAS, NEW YORK, NY 10010 SN 0010-2180 J9 COMBUST FLAME JI Combust. Flame PD OCT PY 1993 VL 95 IS 1-2 BP 206 EP 218 DI 10.1016/0010-2180(93)90062-8 PG 13 WC Thermodynamics; Energy & Fuels; Engineering, Multidisciplinary; Engineering, Chemical; Engineering, Mechanical SC Thermodynamics; Energy & Fuels; Engineering GA MA077 UT WOS:A1993MA07700015 ER PT J AU COHEN, ME AF COHEN, ME TI CONFIGURAL FREQUENCY-ANALYSIS FOR EXPLORING BACTERIAL SETS IN PERIODONTAL HEALTH AND DISEASE SO COMMUNITY DENTISTRY AND ORAL EPIDEMIOLOGY LA English DT Article DE BIOSTATISTICS; MICROBIAL PATTERNS; PERIODONTITIS ID GINGIVALIS AB Periodontal research has been concerned with identifying bacterial sets in oral health and disease. Configural frequency analysis (CFA) is a taxonomical method used to test the statistical significance of patterns of elementary cell frequencies in cross-tabulated data, and may therefore be used to evaluate interactions among occurrences and non-occurrences of periodontal microorganisms. CFA patterns may exist as configural types or antitypes depending on whether observed cell frequencies are greater or less than expected frequencies, respectively, based on table marginals. CFA was applied to two published data sets. In the first, the occurrence of Bacteroides (Porphyromonas) gingivalis (Bg) and Treponema denticola (Td) was studied in military subjects. Analysis of individual cells of the resultant two-by-two contingency table revealed the existence of a single antitype (Td in the absence of Bg) suggesting a sequential phenomenon. The second, more complex, data set was based on reported occurrence of Actinohacillus actinomycetemcomitans (Aa), Bg, and Bacteroides (Prevotella) intermedius (Bi) in sites with and without progressive periodontitis. CFA based on all data identified three statistically significant configural types and two antitypes. However, a somewhat different configurational picture emerged when disease progression status was considered a stratification variable for separate analysis. All these analyses, which were undertaken for expository purposes, assumed independence of observations. Methodological procedures are suggested for CFA when observations are not independent. RP COHEN, ME (reprint author), USN,INST DENT RES,BLDG 1-H,GREAT LAKES,IL 60088, USA. NR 10 TC 1 Z9 1 U1 0 U2 0 PU MUNKSGAARD INT PUBL LTD PI COPENHAGEN PA 35 NORRE SOGADE, PO BOX 2148, DK-1016 COPENHAGEN, DENMARK SN 0301-5661 J9 COMMUNITY DENT ORAL JI Community Dentist. Oral Epidemiol. PD OCT PY 1993 VL 21 IS 5 BP 283 EP 287 DI 10.1111/j.1600-0528.1993.tb00775.x PG 5 WC Dentistry, Oral Surgery & Medicine; Public, Environmental & Occupational Health SC Dentistry, Oral Surgery & Medicine; Public, Environmental & Occupational Health GA MB425 UT WOS:A1993MB42500007 PM 8222602 ER PT J AU MUELLER, E SIKES, CS LITTLE, BJ AF MUELLER, E SIKES, CS LITTLE, BJ TI PEPTIDE INTERACTIONS WITH STEEL SURFACES - INHIBITION OF CORROSION AND CALCIUM-CARBONATE PRECIPITATION SO CORROSION LA English DT Article DE AISI 1018 MILD STEEL; TYPE 304 STAINLESS STEEL; CORROSION INHIBITION; PEPTIDES; SCALE INHIBITION; WATER TREATMENT AB Polyaspartate, a polyanionic peptide analog of an oyster-shell protein fraction, inhibited corrosion of AISI 1018 mild steel (UNS G10180) in seawater in a dose-dependent manner. A maximal inhibition of approximate to 60% was obtained af a concentration of 100 mu g mL(-1). Related peptides containing hydrophobic and/or phosphorylated amino acids had corrosion inhibition activities similar to or lower than polyaspartate in fresh and brackish waters. Binding studies demonstrated polyaspartate bound to mild steel in a dose- and time-dependent manner. Evidence for stainless steel (SS) binding was based on inhibition af calcium carbonate precipitation on the SS surface. C1 USN,RES LAB,BAY ST LOUIS,MS 39529. RP MUELLER, E (reprint author), UNIV SO ALABAMA,LSB 124,CTR MINERALIZAT,MOBILE,AL 36688, USA. NR 25 TC 13 Z9 16 U1 0 U2 1 PU NATL ASSN CORROSION ENG PI HOUSTON PA 1440 SOUTH CREEK DRIVE, HOUSTON, TX 77084-4906 SN 0010-9312 J9 CORROSION JI Corrosion PD OCT PY 1993 VL 49 IS 10 BP 829 EP 835 PG 7 WC Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Materials Science; Metallurgy & Metallurgical Engineering GA MD969 UT WOS:A1993MD96900006 ER PT J AU BOWLING, LS SAGEMAN, WS OCONNOR, SM COLE, R AMUNDSON, DE AF BOWLING, LS SAGEMAN, WS OCONNOR, SM COLE, R AMUNDSON, DE TI LACK OF AGREEMENT BETWEEN MEASUREMENT OF EJECTION FRACTION BY IMPEDANCE CARDIOGRAPHY VERSUS RADIONUCLIDE VENTRICULOGRAPHY SO CRITICAL CARE MEDICINE LA English DT Article DE CARDIOGRAPHY, IMPEDANCE; IMPEDANCE, THORACIC; EJECTION FRACTION; LEFT VENTRICULAR FUNCTION; SYSTOLIC TIME INTERVALS; RADIONUCLIDE VENTRICULOGRAPHY; CARDIAC EMERGENCIES; HEART; CRITICAL ILLNESS AB Objective: To determine the limits of agreement between left ventricular ejection fraction estimated using systolic time intervals from impedance cardiography and left ventricular ejection fraction estimated by radionuclide ventriculography. Design: A prospective study for diagnostic tests using radionuclide ventriculography as the criterion standard. Setting: A large, military teaching hospital. Patients: Twenty ambulatory adults scheduled for radionuclide ventriculography. Measurements and Main Results: A regression equation to estimate ejection fraction from systolic time intervals is available in a widely used impedance-based cardiac monitoring device. The estimated ejection fraction is then used in an equation with stroke volume estimated by the same device to calculate an end-diastolic volume. We studied the agreement of the ejection fraction as estimated by this device with the ejection fraction estimated by radionuclide ventriculography by obtaining simultaneous estimates of ejection fraction over a broad range of adult patients. Twenty ejection fraction pairs were analyzed. The correlation of ejection fraction by impedance cardiography to ejection fraction by radionuclide ventriculography was significant (r2 = .55; p < .002). However, the mean difference between the technologies was -8.85%, with a standard deviation of the differences of 7.15%, resulting in a 95% confidence range for agreement of -23.2% to +5.5%. Conclusions: The 95% confidence range defining the limits of agreement between ejection fraction by impedance cardiography and ejection fraction by radionuclide ventriculography is not clinically acceptable. In the opinion of the authors impedance cardiography should not be used in place of radionuclide ventriculography for the assessment of ejection fraction at this time. C1 USN HOSP,DEPT INTERNAL MED,DIV CARDIOL,SAN DIEGO,CA 92134. USN HOSP,DEPT CRIT CARE MED,SAN DIEGO,CA 92134. USN HOSP,DEPT RADIOL & CLIN INVEST,DIV NUCL MED,SAN DIEGO,CA 92134. RP BOWLING, LS (reprint author), USN HOSP,DEPT CLIN INVEST,USNR,SAN DIEGO,CA 92134, USA. NR 9 TC 9 Z9 9 U1 0 U2 0 PU WILLIAMS & WILKINS PI BALTIMORE PA 351 WEST CAMDEN ST, BALTIMORE, MD 21201-2436 SN 0090-3493 J9 CRIT CARE MED JI Crit. Care Med. PD OCT PY 1993 VL 21 IS 10 BP 1523 EP 1527 DI 10.1097/00003246-199310000-00021 PG 5 WC Critical Care Medicine SC General & Internal Medicine GA MB228 UT WOS:A1993MB22800021 PM 8403962 ER PT J AU HEBEL, JL SNIDER, RL MITCHELL, D AF HEBEL, JL SNIDER, RL MITCHELL, D TI LOFGRENS SYNDROME SO CUTIS LA English DT Article ID SARCOIDOSIS AB Lofgren's syndrome consists of a triad of erythema nodosum, bilateral hilar adenopathy, and arthritis and heralds the acute onset of sarcoidosis. A single symptom may be misdiagnosed and mistreated by an unsuspecting physician. We present a case of Lofgren's syndrome that was initially believed to be cellulitis. We briefly review the course and treatment of Lofgren's syndrome. C1 USN HOSP,CHARLESTON,SC. MED UNIV S CAROLINA,CHARLESTON,SC 29425. NR 6 TC 2 Z9 2 U1 0 U2 0 PU EXCERPTA MEDICA INC PI NEW YORK PA 245 WEST 17TH STREET, NEW YORK, NY 10011 SN 0011-4162 J9 CUTIS JI Cutis PD OCT PY 1993 VL 52 IS 4 BP 223 EP 224 PG 2 WC Dermatology SC Dermatology GA PK219 UT WOS:A1993PK21900010 PM 8261808 ER PT J AU DOLK, DR AF DOLK, DR TI AN INTRODUCTION TO MODEL INTEGRATION AND INTEGRATED MODELING ENVIRONMENTS SO DECISION SUPPORT SYSTEMS LA English DT Article DE MODEL INTEGRATION; STRUCTURED MODELING; LOGIC MODELING; GRAPH-GRAMMARS; INTEGRATED MODELING ENVIRONMENTS ID SYSTEM AB Integrated modeling systems provide support for the definition, manipulation, and control of mathematical models throughout the entire modeling life cycle. Model integration is a particularly crucial operation which requires thinking about ''modeling in the large'', and which extends the scope of model management research to include manipulation as well as definition. Several aspects of model integration are identified and briefly described with respect to the problems they raise for constructing integrated modeling environments. Relevant work in these areas is cited. A brief introduction to each of the papers in this special issue is provided within the context established. RP DOLK, DR (reprint author), USN,SCH POSTGRAD,DEPT ADM SCI,MONTEREY,CA 93943, USA. NR 19 TC 13 Z9 15 U1 1 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0167-9236 J9 DECIS SUPPORT SYST JI Decis. Support Syst. PD OCT PY 1993 VL 10 IS 3 BP 249 EP 254 DI 10.1016/0167-9236(93)90062-8 PG 6 WC Computer Science, Artificial Intelligence; Computer Science, Information Systems; Operations Research & Management Science SC Computer Science; Operations Research & Management Science GA MB544 UT WOS:A1993MB54400001 ER PT J AU BHARGAVA, HK KIMBROUGH, SO AF BHARGAVA, HK KIMBROUGH, SO TI MODEL MANAGEMENT - AN EMBEDDED LANGUAGES APPROACH SO DECISION SUPPORT SYSTEMS LA English DT Article DE DECISION SUPPORT SYSTEMS; MODEL MANAGEMENT; LOGIC; ARTIFICIAL INTELLIGENCE; FORMAL LANGUAGES AB Model management is an important component of decision support. Executable modeling languages (EMLs) have been employed quite successfully in designing useful modeling systems. In this paper, we present a technique, called embedded languages, which is a generalization of the EML approach, we believe that this technique can prove extremely useful in implementing desirable features not usually found in existing systems. The approach is discussed with reference to such a system, TEFA, which has been developed, and is being improved, on the basis of this technique. C1 UNIV PENN,DEPT DECIS SCI,PHILADELPHIA,PA 19104. RP BHARGAVA, HK (reprint author), USN,POSTGRAD SCH,MONTEREY,CA 93943, USA. NR 28 TC 13 Z9 13 U1 0 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0167-9236 J9 DECIS SUPPORT SYST JI Decis. Support Syst. PD OCT PY 1993 VL 10 IS 3 BP 277 EP 299 DI 10.1016/0167-9236(93)90064-A PG 23 WC Computer Science, Artificial Intelligence; Computer Science, Information Systems; Operations Research & Management Science SC Computer Science; Operations Research & Management Science GA MB544 UT WOS:A1993MB54400003 ER PT J AU SMITH, MF LITTS, WC ROBBIANO, L HOIN, JJ NATHAN, RG BONT, EM AF SMITH, MF LITTS, WC ROBBIANO, L HOIN, JJ NATHAN, RG BONT, EM TI USING A BALINT-LIKE GROUP FOR GERIATRIC EDUCATION IN A NURSING-HOME SETTING SO EDUCATIONAL GERONTOLOGY LA English DT Article; Proceedings Paper CT 1992 ANNUAL MEETING OF THE SOC-OF-TEACHERS-OF-FAMILY-MEDICINE CY APR, 1992 CL ST LOUIS, MO SP SOC TEACHERS FAMILY MED AB The authors describe how a weekly patient care conference evolved into a multidisciplinary round-table educational and support program for nursing home staff and for family practice residents as part of a geriatric rotation. Like a Balint group, in which physicians discuss their relationships with their patients and the illnesses, the Roundtable offers a mechanism to share responses to patient care, discuss emotional as well as ethical issues in a confidential environment, and receive continuing medical and health-care education. This report reviews the evolution of the Roundtable group; describes the processes involved, delineates educational goals, objectives, and implementation; and presents some case examples. C1 USN,WASHINGTON,DC 20350. RP SMITH, MF (reprint author), ALBANY MED COLL,DEPT FAMILY PRACTICE,1 CLARA BARTON DR,ALBANY,NY 12208, USA. NR 14 TC 3 Z9 3 U1 1 U2 3 PU HEMISPHERE PUBL CORP PI BRISTOL PA 1900 FROST ROAD, SUITE 101, BRISTOL, PA 19007-1598 SN 0360-1277 J9 EDUC GERONTOL JI Educ. Gerontol. PD OCT-NOV PY 1993 VL 19 IS 7 BP 597 EP 606 DI 10.1080/0360127930190702 PG 10 WC Education & Educational Research; Gerontology SC Education & Educational Research; Geriatrics & Gerontology GA ME290 UT WOS:A1993ME29000002 ER PT J AU HARVEY, DP TERRELL, JB SUDARSHAN, TS LOUTHAN, MR AF HARVEY, DP TERRELL, JB SUDARSHAN, TS LOUTHAN, MR TI PARTICIPATION OF HYDROGEN IN THE IMPACT BEHAVIOR OF 304L STAINLESS-STEEL SO ENGINEERING FRACTURE MECHANICS LA English DT Article ID DUCTILE FRACTURE; ASSISTED CRACKING; EMBRITTLEMENT; NICKEL; IRON AB Charpy V-notched impact test studies on 304L austenitic stainless steel at 293 and 77 K demonstrated that hydrogen charging promoted the formation of wider and shallower microvoids at 293 K, promoted microvoid nucleation at 77 K and reduced the energy absorbed by the material at both temperatures. These observations suggest that the role of hydrogen in the impact behavior of this material is to enhance whatever damage mechanisms are operating at a given temperature. Further, the observation that embrittlement exists even at liquid nitrogen temperatures indicates that little or no localized rearrangement of hydrogen during the test is required or that relatively high strain rate effects on hydrogen embrittlement need not necessarily be attributed to enhanced transport of hydrogen atmospheres by mobile dislocations. The data presented in this paper are consistent with a model in which the mechanism of hydrogen embrittlement is affected by the extent of plastic deformation. C1 REYNOLDS MET CO,RICHMOND,VA 23221. MAT MODIFICAT INC,FAIRFAX,VA 22031. DUPONT CO INC,SAVANNAH RIVER LAB,AIKEN,SC 29801. RP HARVEY, DP (reprint author), USN,RES LAB,MECH MAT BRANCH,WASHINGTON,DC 20375, USA. NR 42 TC 8 Z9 8 U1 1 U2 3 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 OCT PY 1993 VL 46 IS 3 BP 455 EP 464 DI 10.1016/0013-7944(93)90237-M PG 10 WC Mechanics SC Mechanics GA MD159 UT WOS:A1993MD15900009 ER PT J AU KAISER, E FORSTER, R WOLF, I EBENSPERGER, C KUEHL, WM LIPP, M AF KAISER, E FORSTER, R WOLF, I EBENSPERGER, C KUEHL, WM LIPP, M TI THE G-PROTEIN-COUPLED RECEPTOR BLR1 IS INVOLVED IN MURINE B-CELL DIFFERENTIATION AND IS ALSO EXPRESSED IN NEURONAL TISSUES SO EUROPEAN JOURNAL OF IMMUNOLOGY LA English DT Article DE B-CELL DIFFERENTIATION; G-PROTEIN-COUPLED RECEPTOR; CYTOKINE RECEPTOR; NEUROPEPTIDE RECEPTOR; BURKITTS LYMPHOMA ID HUMAN INTERLEUKIN-8 RECEPTOR; HUMAN T-CELLS; MESSENGER-RNA; FUNCTIONAL EXPRESSION; INSITU HYBRIDIZATION; SIGNAL TRANSDUCTION; BURKITTS-LYMPHOMA; ANTIGEN RECEPTOR; CYTOKINE FAMILY; CDNA AB The BLR1 gene, isolated initially from Burkitt's lymphoma cells (Eur. J Immunol. 1992. 22:2795), encodes a G protein-coupled receptor with significant relationship to receptors for chemokines (IL-8, MIP-1a) and neuropeptides. The murine homologue of human BLR1 was cloned and used to investigate its expression in vivo. blr1-specific transcripts are observed in secondary lymphatic organs and to a lesser extent in brain of adult mice but not in other tissues. RNA in situ hybridization localizes blr1 transcription to primary follicles and to the mantle zone of secondary follicles. SCID mice in which mature B cell development is severely impaired exhibit a strongly reduced level of blr1-specific RNA in the spleen. The analysis of murine lymphoid tumor cell lines representing distinct stages of the B cell lineage reveals elevated expression of blr1 in B cell lymphomas but not in pre-B lymphomas or plasmacytomas. Induction of differentiation of resting B cells by cytokines or mitogens down-regulates expression of blr1. RNA in situ hybridization using brain sections of adult mice detects blr1 transcription in the granule and Purkinje cell layer of the cerebellum. Interestingly, the blr1 gene is also expressed during late embryogenesis in fetal liver and brain. In view of the remarkable expression pattern in the B cell lineage we suggest that murine BLR1 may represent a cytokine/neuropeptide receptor exerting regulatory functions on recirculating mature B lymphocytes. C1 UNIV MUNICH,INST BIOCHEM,KLOPFERSPITZ 18A,D-82152 MARTINSRIED,GERMANY. UNIV ULM,KLIN GENET ABT,W-7900 ULM,GERMANY. USN,NCI,MED ONCOL BRANCH,BETHESDA,MD 20814. RI Lipp, Martin/G-2235-2010; Forster, Reinhold/D-6770-2011 NR 51 TC 52 Z9 53 U1 0 U2 1 PU VCH PUBLISHERS INC PI DEERFIELD BEACH PA 303 NW 12TH AVE, DEERFIELD BEACH, FL 33442-1788 SN 0014-2980 J9 EUR J IMMUNOL JI Eur. J. Immunol. PD OCT PY 1993 VL 23 IS 10 BP 2532 EP 2539 DI 10.1002/eji.1830231023 PG 8 WC Immunology SC Immunology GA MD626 UT WOS:A1993MD62600022 PM 8405054 ER PT J AU LEE, CH WASOWICZ, K BROWN, R MAJANE, EA YANG, HYT PANULA, P AF LEE, CH WASOWICZ, K BROWN, R MAJANE, EA YANG, HYT PANULA, P TI DISTRIBUTION AND CHARACTERIZATION OF NEUROPEPTIDE FF-LIKE IMMUNOREACTIVITY IN THE RAT NERVOUS-SYSTEM WITH A MONOCLONAL-ANTIBODY SO EUROPEAN JOURNAL OF NEUROSCIENCE LA English DT Article DE NEUROPEPTIDE-FF; HYPOTHALAMUS; NUCLEUS OF THE SOLITARY TRACT; ANALGESIA; MORPHINE ID MORPHINE-MODULATING PEPTIDES; MAMMALIAN FMRF-NH2-LIKE PEPTIDE; SPINAL-CORD; BRAIN; FLFQPQRFAMIDE; FMRFAMIDE; FLFQPQRF-NH2; ANTISERUM; NEURONS; AMIDE AB Monoclonal antibodies against neuropeptide FF were produced and characterized. The antibodies are directed and highly specific to neuropeptide FF, and reactivity requires the C-terminal dipeptide of neuropeptide FF (Arg-Phe-NH2). Tissue extracts from bovine spinal cord, rat spinal cord and hypothalamus were analysed by high-pressure liquid chromatography coupled with radioimmunoassay using the characterized monoclonal antibody. Only one immunoreactive peptide was detected and it coeluted with authentic neuropeptide FF. Using this highly specific monoclonal antibody, the distribution of neuropeptide FF-like immunoreactivity was further studied by indirect immunohistochemistry. Immunoreactivity was seen in two major cell groups in the rat brain. The largest cell group was located in the medial hypothalamus between the dorsomedial and ventromedial nuclei. The other one was found in the nucleus of the solitary tract. Fibres immunoreactive for neuropeptide FF were located in the lateral septal nucleus, amygdala, different hypothalamic areas, nucleus of the solitary tract, ventral medulla, trigeminal complex and the dorsal horn of the spinal cord. Spinal and sympathetic ganglia were non-reactive. No neuropeptide FF immunoreactivity was seen in the gut autonomic nervous system or endocrine cells. The results show that neuropeptide FF-like immunoreactivity has a clearly more limited distribution in the nervous system than typical brain - gut peptides. C1 UNIV TURKU, ABO AKAD, DEPT BIOL, BIOCITY, TYKISTOKATU 6A, SF-20520 TURKU 52, FINLAND. USN, MED RES INST, CASUALTY CARE RES DEPT, DIV METAB RES, BETHESDA, MD 20814 USA. NIMH, NEUROSCI CTR ST ELIZABETH, BIOCHEM GENET LAB, WASHINGTON, DC 20032 USA. UNIV HELSINKI, DEPT ANAT, SF-00014 HELSINKI, FINLAND. NR 25 TC 33 Z9 33 U1 0 U2 1 PU OXFORD UNIV PRESS UNITED KINGDOM PI OXFORD PA WALTON ST JOURNALS DEPT, OXFORD, ENGLAND OX2 6DP SN 0953-816X J9 EUR J NEUROSCI JI Eur. J. Neurosci. PD OCT 1 PY 1993 VL 5 IS 10 BP 1339 EP 1348 DI 10.1111/j.1460-9568.1993.tb00920.x PG 10 WC Neurosciences SC Neurosciences & Neurology GA MD752 UT WOS:A1993MD75200012 PM 8275233 ER PT J AU MILLIS, RL WASSERMAN, LH FRANZ, OG NYE, RA ELLIOT, JL DUNHAM, EW BOSH, AS YOUNG, LA SLIVAN, SM GILMORE, AC KILMARTIN, PM ALLEN, WH WATSON, RD DIETERS, SW HILL, KM GILES, AB BLOW, G PRIESTLEY, J KISSLING, WM WALKER, WSG MARINO, BF DIX, DG PAGE, AA ROSS, JE AVEY, HP HICKEY, D KENNEDY, HD MOTTRAM, KA MOYLAND, G MURPHY, T DAHN, CC KLEMOLA, AR AF MILLIS, RL WASSERMAN, LH FRANZ, OG NYE, RA ELLIOT, JL DUNHAM, EW BOSH, AS YOUNG, LA SLIVAN, SM GILMORE, AC KILMARTIN, PM ALLEN, WH WATSON, RD DIETERS, SW HILL, KM GILES, AB BLOW, G PRIESTLEY, J KISSLING, WM WALKER, WSG MARINO, BF DIX, DG PAGE, AA ROSS, JE AVEY, HP HICKEY, D KENNEDY, HD MOTTRAM, KA MOYLAND, G MURPHY, T DAHN, CC KLEMOLA, AR TI PLUTOS RADIUS AND ATMOSPHERE - RESULTS FROM THE ENTIRE 9 JUNE 1988 OCCULTATION DATA SET SO ICARUS LA English DT Article ID STELLAR OCCULTATION; CHARON; MODELS C1 MIT,CAMBRIDGE,MA 02139. UNIV CANTERBURY,DEPT PHYS & ASTRON,CHRISTCHURCH,NEW ZEALAND. MT JOHN UNIV OBSERV,CHRISTCHURCH,NEW ZEALAND. ADAMS LANE OBSERV,BLENHEIM,NEW ZEALAND. UNIV TASMANIA,HOBART,TAS,AUSTRALIA. CARTER OBSERV,WELLINGTON,NEW ZEALAND. DSIR,DIV APPL MATH,WELLINGTON,NEW ZEALAND. AUCKLAND OBSERV,AUCKLAND,NEW ZEALAND. UNIV QUEENSLAND,ST LUCIA,QLD,AUSTRALIA. UNIV SO QUEENSLAND,TOOWOOMBA,QLD,AUSTRALIA. USN OBSERV,FLAGSTAFF STN,FLAGSTAFF,AZ 86002. UNIV CALIF SANTA CRUZ,LICK OBSERV,BOARD STUDIES ASTRON & ASTROPHYS,SANTA CRUZ,CA 95064. RP MILLIS, RL (reprint author), LOWELL OBSERV,FLAGSTAFF,AZ 86001, USA. NR 23 TC 58 Z9 58 U1 0 U2 2 PU ACADEMIC PRESS INC JNL-COMP SUBSCRIPTIONS PI SAN DIEGO PA 525 B ST, STE 1900, SAN DIEGO, CA 92101-4495 SN 0019-1035 J9 ICARUS JI Icarus PD OCT PY 1993 VL 105 IS 2 BP 282 EP 297 DI 10.1006/icar.1993.1126 PG 16 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA ML417 UT WOS:A1993ML41700003 ER PT J AU GREFENSTETTE, JJ AF GREFENSTETTE, JJ TI GENETIC ALGORITHMS SO IEEE EXPERT-INTELLIGENT SYSTEMS & THEIR APPLICATIONS LA English DT Article RP GREFENSTETTE, JJ (reprint author), USN,RES LAB,NAVY CTR APPL RES ARTIFICIAL INTELLIGENCE,MACHINE LEARNING SECT,WASHINGTON,DC 20375, USA. NR 10 TC 6 Z9 6 U1 0 U2 0 PU IEEE COMPUTER SOC PI LOS ALAMITOS PA 10662 LOS VAQUEROS CIRCLE, PO BOX 3014, LOS ALAMITOS, CA 90720-1264 SN 0885-9000 J9 IEEE EXPERT JI IEEE Expert-Intell. Syst. Appl. PD OCT PY 1993 VL 8 IS 5 BP 5 EP 8 PG 4 WC Computer Science, Artificial Intelligence; Engineering, Electrical & Electronic SC Computer Science; Engineering GA LZ562 UT WOS:A1993LZ56200003 ER PT J AU SCHULTZ, AC GREFENSTETTE, JJ DEJONG, KA AF SCHULTZ, AC GREFENSTETTE, JJ DEJONG, KA TI TEST AND EVALUATION BY GENETIC ALGORITHMS SO IEEE EXPERT-INTELLIGENT SYSTEMS & THEIR APPLICATIONS LA English DT Article RP SCHULTZ, AC (reprint author), USN,RES LAB,NAVY CTR APPL RES ARTIFICIAL INTELLIGENCE,MACHINE LEARNING SECT,WASHINGTON,DC 20375, USA. NR 8 TC 22 Z9 22 U1 0 U2 0 PU IEEE COMPUTER SOC PI LOS ALAMITOS PA 10662 LOS VAQUEROS CIRCLE, PO BOX 3014, LOS ALAMITOS, CA 90720-1264 SN 0885-9000 J9 IEEE EXPERT JI IEEE Expert-Intell. Syst. Appl. PD OCT PY 1993 VL 8 IS 5 BP 9 EP 13 DI 10.1109/64.236476 PG 5 WC Computer Science, Artificial Intelligence; Engineering, Electrical & Electronic SC Computer Science; Engineering GA LZ562 UT WOS:A1993LZ56200004 ER PT J AU BAGGEROER, AB KUPERMAN, WA MIKHALEVSKY, PN AF BAGGEROER, AB KUPERMAN, WA MIKHALEVSKY, PN TI AN OVERVIEW OF MATCHED-FIELD METHODS IN OCEAN ACOUSTICS SO IEEE JOURNAL OF OCEANIC ENGINEERING LA English DT Article ID PROBABILITY SOURCE LOCALIZATION; DOMAIN SIGNAL TRANSMISSION; WATER PACIFIC ENVIRONMENT; SHALLOW-WATER; WAVE-GUIDE; DEPTH ESTIMATION; VERTICAL ARRAY; BROAD-BAND; STRATIFIED OCEAN; SOURCE LOCATION AB Recent array processing methods for ocean acoustics have utilized the physics of wave propagation as an integral part of their design. The physics of the propagation leads to both improved performance and to algorithms where the complexity of the ocean environment can be exploited in ways not possible with traditional plane wave based methods. Matched field processing (MFP) is a generalized beamforming method which uses the spatial complexities of acoustic fields in an ocean waveguide to localize sources in range, depth and azimuth or to infer parameters of the waveguide itself. It has experimentally localized sources with accuracies exceeding the Rayleigh limit for depth and the Fresnel limit for range by two orders of magnitude. MFP exploits the coherence of the mode/multipath structure and it is especially effective at low frequencies where the ocean supports coherent propagation over very long ranges. This contrasts with plane wave based models which are degraded by modal and multipath phenomena and are generally ineffective when waveguide phenomena are important. MFP can have either conventional or adaptive formulations and it has been implemented with an assortment of both narrowband and wideband signal models. All involve some form of correlation between the replicas derived from the wave equation and the data measured at an array of sensors. One can view MFP as an inverse problem where one attempts to ''invert'' the wave equation for these dependencies over the parameter space of the source and the environment. There is currently a large literature discussing many theoretical aspects of MFP including numerous simulations; several experiments acquiring data for MFP now have been conducted in several ocean environments and these have demonstrated both its capabilities and some of its limitations. Consequently, there is a modest understanding of both the theory and the experimental capabilities of MFP. This article provides an overview of both. C1 MIT,DEPT ELECT & COMP SCI,CAMBRIDGE,MA 02139. USN,RES LAB,WASHINGTON,DC 20375. SCI APPLICAT INT CORP,OCEAN SCI & TECHNOL OPERAT,MCLEAN,VA 22102. RP BAGGEROER, AB (reprint author), MIT,DEPT OCEAN ENGN,CAMBRIDGE,MA 02139, USA. NR 138 TC 389 Z9 425 U1 5 U2 29 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0364-9059 J9 IEEE J OCEANIC ENG JI IEEE J. Ocean. Eng. PD OCT PY 1993 VL 18 IS 4 BP 401 EP 424 DI 10.1109/48.262292 PG 24 WC Engineering, Civil; Engineering, Ocean; Engineering, Electrical & Electronic; Oceanography SC Engineering; Oceanography GA MX800 UT WOS:A1993MX80000005 ER PT J AU HERMAND, JP RODERICK, WI AF HERMAND, JP RODERICK, WI TI ACOUSTIC MODEL-BASED MATCHED-FILTER PROCESSING FOR FADING TIME-DISPERSIVE OCEAN CHANNELS - THEORY AND EXPERIMENT SO IEEE JOURNAL OF OCEANIC ENGINEERING LA English DT Article DE MODEL-BASED MATCHED FILTER; CHANNEL ADAPTIVE PROCESSING; TIME DISPERSION AB Propagation effects degrade the performance of active sonar systems operating in either deep or shallow water. The ocean medium distorts the transmitted signals by time dispersion and as a result, the performance (signal-to-noise ratio) of correlation receivers is reduced if the receiver does not account for energy spreading. Results from this study demonstrate that the performance of a conventional matched filter can be improved if the reference (replica) channel compensates for the distortion. A model-based matched filter is generated by correlating the received signal with a reference channel that consists of the transmitted signal convolved with the impulse response of the medium. The channel impulse responses are predicted with a broadband propagation model using in situ sound speed measured data and archival bottom loss data. The relative performance of conventional and model-based matched filter processing is compared for large time-bandwidth product linear frequency modulated signals propagating in a dispersive waveguide. From ducted propagation measurements conducted in an area west of Sardinia, the model-based matched filter localizes the depths of both the source and receiving array and the range between them. The peak signal-to-noise ratio for the model-based matched filter is always larger than the conventional. C1 FREE UNIV BRUSSELS,FAC APPL SCI,B-1050 BRUSSELS,BELGIUM. USN,CTR NAVAL UNDERWATER WARFARE,NEWPORT,RI 02841. RP HERMAND, JP (reprint author), SACLANT,UNDERSEA RES CTR,VIALE SAN BARTOLOMEO 400,I-19138 LA SPEZIA,ITALY. NR 27 TC 36 Z9 39 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 OCT PY 1993 VL 18 IS 4 BP 447 EP 465 DI 10.1109/48.262295 PG 19 WC Engineering, Civil; Engineering, Ocean; Engineering, Electrical & Electronic; Oceanography SC Engineering; Oceanography GA MX800 UT WOS:A1993MX80000008 ER PT J AU ZVARA, GP AF ZVARA, GP TI REAL-TIME TIME-FREQUENCY ACTIVE SONAR PROCESSING - A SIMD APPROACH SO IEEE JOURNAL OF OCEANIC ENGINEERING LA English DT Article DE PARALLEL PROCESSING; REPLICA CORRELATION; HIGH PERFORMANCE COMPUTING; TIME-FREQUENCY PROCESSING AB A paradigm for massively parallel processing of matched filters, replica correlators, ambiguity functions, and time-frequency distributions is presented using a SIMD (Single Instruction Multiple Data) programming methodology. It is shown that active sonar detection algorithms, as implemented by frequency domain processing, can be a ''natural match'' to a SIMD methodology. Using the Connection Machine, a 8192 node SIMD parallel processor, this methodology meets the extensive computational needs of enhanced active sonar systems. The decomposition process is presented and examples are given of the output of the computer program OMASP (Connection Machine Ambiguity Surface Processor). CMASP can provide real-time simultaneous multiple beam, Doppler and waveform replica correlations. Synthetic data are processed and the corresponding CMASP outputs are displayed as three-dimensional ambiguity surfaces on networked graphic workstations. Because of efficient problem decomposition, other time-frequency processing can be exploited. Specifically, real-time instantaneous-like time-frequency distributions have been realized (e.g., Rihaczek distributions) in which the data set is presented and processed as time-varying spectral representations. RP ZVARA, GP (reprint author), USN,NAVAL UNDERSEA WARFARE CTR,DEPT SUBMARINE SONAR,SOFTWARE ENGN LAB,DETACHMENT NEW LONDON,NEW LONDON,CT 06320, USA. NR 6 TC 2 Z9 2 U1 0 U2 0 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0364-9059 J9 IEEE J OCEANIC ENG JI IEEE J. Ocean. Eng. PD OCT PY 1993 VL 18 IS 4 BP 520 EP 528 DI 10.1109/48.262302 PG 9 WC Engineering, Civil; Engineering, Ocean; Engineering, Electrical & Electronic; Oceanography SC Engineering; Oceanography GA MX800 UT WOS:A1993MX80000015 ER PT J AU WAGSTAFF, RA AF WAGSTAFF, RA TI A COMPUTERIZED SYSTEM FOR ASSESSING TOWED ARRAY SONAR FUNCTIONALITY AND DETECTING FAULTS SO IEEE JOURNAL OF OCEANIC ENGINEERING LA English DT Article AB A computer-based system has been developed that processes hydrophone and beam noise data from a towed horizontal line array sonar. The system also produces various displays that can be used to help assess the functionality of the sonar and to identify faults that cause degraded performance. The system and various statistics used for characterizing or quantifying a given aspect of the sonar's performance are discussed. The results are presented in visual formats to aid in rapid assessment and quantification of the sonar's performance. Examples obtained from the system during recent towed array ambient noise measurement exercises are given to illustrate its utility for real-time performance monitoring and its capability for providing clues to aid in fault localization. RP WAGSTAFF, RA (reprint author), NAVAL RES LAB,BAY ST LOUIS,MS 39529, USA. NR 7 TC 3 Z9 3 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 0364-9059 J9 IEEE J OCEANIC ENG JI IEEE J. Ocean. Eng. PD OCT PY 1993 VL 18 IS 4 BP 529 EP 542 DI 10.1109/48.262303 PG 14 WC Engineering, Civil; Engineering, Ocean; Engineering, Electrical & Electronic; Oceanography SC Engineering; Oceanography GA MX800 UT WOS:A1993MX80000016 ER PT J AU SCHEPS, R AF SCHEPS, R TI LOW-THRESHOLD DYE-LASER PUMPED BY VISIBLE LASER-DIODES SO IEEE PHOTONICS TECHNOLOGY LETTERS LA English DT Article AB A continuous-wave (CW) dye laser has been pumped by laser diodes for the first time. Two 10-mW visible laser diodes were polarization-combined to pump a rhodamine 700 dye jet laser. The absorbed pump threshold power was 5.6 mW, and 0.28 mW of output power was produced at 758 nm. The resonator was scalable and generated over 360 mW with a slope efficiency of 57% when pumped with a DCM dye laser at 660 nm. RP SCHEPS, R (reprint author), USN COMMAND,CTR CONTROL & OCEAN SURVEILLANCE,DIV RDT & E NRAD,CODE 754,SAN DIEGO,CA 92152, USA. NR 9 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 1041-1135 J9 IEEE PHOTONIC TECH L JI IEEE Photonics Technol. Lett. PD OCT PY 1993 VL 5 IS 10 BP 1156 EP 1158 DI 10.1109/68.248412 PG 3 WC Engineering, Electrical & Electronic; Optics; Physics, Applied SC Engineering; Optics; Physics GA ML436 UT WOS:A1993ML43600014 ER PT J AU MEHUYS, D GOLDBERG, L WELCH, DF AF MEHUYS, D GOLDBERG, L WELCH, DF TI 5.25-W CW NEAR-DIFFRACTION-LIMITED TAPERED-STRIPE SEMICONDUCTOR OPTICAL AMPLIFIER SO IEEE PHOTONICS TECHNOLOGY LETTERS LA English DT Article ID LASER AB A broad-area tapered-contact single-pass amplifier emitting at 860-nm wavelength is demonstrated to emit up to 5.25 W continuous wave (CW) in a near-diffraction-limited radiation pattern. The diffraction-limited component of the radiation pattern, comprising greater than 87% of the total power at 5.25-W (W output, is observed to decrease slightly with increasing drive current due to filament formation. The output beam astigmatism is found to saturate at high power output in accordance with gain saturation, which indicates that the high-quality output beam remains stable with respect to small changes in current or injected power. C1 USN,RES LAB,WASHINGTON,DC 20375. RP MEHUYS, D (reprint author), SDL INC,SAN JOSE,CA 95134, USA. NR 14 TC 47 Z9 47 U1 0 U2 5 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 1041-1135 J9 IEEE PHOTONIC TECH L JI IEEE Photonics Technol. Lett. PD OCT PY 1993 VL 5 IS 10 BP 1179 EP 1182 DI 10.1109/68.248420 PG 4 WC Engineering, Electrical & Electronic; Optics; Physics, Applied SC Engineering; Optics; Physics GA ML436 UT WOS:A1993ML43600022 ER PT J AU HELMICK, RE RICE, TR AF HELMICK, RE RICE, TR TI REMOVAL OF ALIGNMENT ERRORS IN AN INTEGRATED SYSTEM OF 2 3-D SENSORS SO IEEE TRANSACTIONS ON AEROSPACE AND ELECTRONIC SYSTEMS LA English DT Letter AB An algorithm is presented to relatively align two 3-D sensors using targets that are tracked by both sensors. The algorithm estimates and removes sensor biases and sensor frame orientation errors. For illustrative purposes, the alignment algorithm is applied to simulated track data from two sensors. RP HELMICK, RE (reprint author), USN,DEPT RES & TECHNOL,DAHLGREN,VA 22448, USA. NR 13 TC 38 Z9 56 U1 0 U2 0 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0018-9251 J9 IEEE T AERO ELEC SYS JI IEEE Trans. Aerosp. Electron. Syst. PD OCT PY 1993 VL 29 IS 4 BP 1333 EP 1343 DI 10.1109/7.259537 PG 11 WC Engineering, Aerospace; Engineering, Electrical & Electronic; Telecommunications SC Engineering; Telecommunications GA MD777 UT WOS:A1993MD77700026 ER PT J AU CARROLL, TL PECORA, LM AF CARROLL, TL PECORA, LM TI SYNCHRONIZING NONAUTONOMOUS CHAOTIC CIRCUITS SO IEEE TRANSACTIONS ON CIRCUITS AND SYSTEMS II-EXPRESS BRIEFS LA English DT Article AB We show that the synchronizing of chaotic circuits may be extended to circuits that are periodically forced. We use a phase correction circuit to match the phase in a response circuit to the phase in a drive circuit. These periodically forced synchronized chaotic circuits are much more noise-resistant than autonomous synchronized chaotic circuits, even when the noise is chaos with large components in the same frequency band as the synchronizing signal. RP USN, RES LAB, WASHINGTON, DC 20375 USA. OI Carroll, Thomas/0000-0002-2371-2049 NR 15 TC 88 Z9 93 U1 0 U2 1 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI PISCATAWAY PA 445 HOES LANE, PISCATAWAY, NJ 08855-4141 USA SN 1549-7747 EI 1558-3791 J9 IEEE T CIRCUITS-II JI IEEE Trans. Circuits Syst. II-Express Briefs PD OCT PY 1993 VL 40 IS 10 BP 646 EP 650 DI 10.1109/82.246166 PG 5 WC Engineering, Electrical & Electronic SC Engineering GA MK911 UT WOS:A1993MK91100007 ER PT J AU BRUNING, AM CAMPBELL, FJ AF BRUNING, AM CAMPBELL, FJ TI AGING IN WIRE INSULATION UNDER MULTIFACTOR STRESS SO IEEE TRANSACTIONS ON ELECTRICAL INSULATION LA English DT Review ID ARRHENIUS PARAMETERS AB A fundamentally based chemical-thermo dynamic multifactor stress aging functional relation requiring experimentally based constants is developed, based upon various theoretical models. The specific example presented is that for 120 V aromatic polyimide insulated wire. The stresses of water, temperature, and mechanical strain are included and electrical stress is considered. The results of over 2000 specimens are fitted to the theoretical trends. For a single independent variable function, the resulting relation reduces to the classical Arrhenius curve. The three independent variable relations presented here is applied to data from laboratory aging experiments that simulate insulation deterioration occurring in actual aircraft service experience. The results used in age categorization of US Navy aircraft are generated from wire specimens taken from active aircraft. The paradigm does not use ab initio based constants because of uncertainties in the theoretical development, two forms of which are presented; It is the aim of this presentation to provide a plausible, intuitively meaningful syllogism having elements transferable to other insulation materials/devices/systems, That transfer will require proper recognition of specific chemical mechanisms in the life calculation routine, constrained by practical secondary effects and the need of nonstandard statistics. C1 USN,RES LAB,WASHINGTON,DC. RP BRUNING, AM (reprint author), LECTROMECH DESIGN CO,HERNDON,VA, USA. NR 51 TC 10 Z9 10 U1 0 U2 5 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0018-9367 J9 IEEE T ELECTR INSUL PD OCT PY 1993 VL 28 IS 5 BP 729 EP 754 DI 10.1109/14.237739 PG 26 WC Engineering, Electrical & Electronic SC Engineering GA MC766 UT WOS:A1993MC76600004 ER PT J AU BRANCATO, EL AF BRANCATO, EL TI A PATHWAY TO MULTIFACTOR AGING SO IEEE TRANSACTIONS ON ELECTRICAL INSULATION LA English DT Review ID INSULATION; VOLTAGE AB This paper is concerned with the existing knowledge, its limitations, and potentials for progress in the assessment of insulation aging. The evolution of thermal aging practice, since its inception to the adoption of the chemical rate approach, is described. The empirical nature of electrical stress aging is analyzed. A current research on sub-corona aging is discussed, with indication that electrical aging may be chemical in nature. A review of mechanical, radiation, and humidity aging reveals the common mechanism of deterioration to be also chemical in nature. The conclusion and recommendations are focused upon studies that may lead to progress in multifactor aging. RP BRANCATO, EL (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 14 TC 8 Z9 8 U1 1 U2 3 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0018-9367 J9 IEEE T ELECTR INSUL PD OCT PY 1993 VL 28 IS 5 BP 820 EP 825 DI 10.1109/14.237743 PG 6 WC Engineering, Electrical & Electronic SC Engineering GA MC766 UT WOS:A1993MC76600008 ER PT J AU KUB, FJ ANDERSON, GW AF KUB, FJ ANDERSON, GW TI COMPRESSING PHOTODETECTORS FOR LONG OPTICAL PULSES USING A LATERAL BLOOMING DRAIN STRUCTURE SO IEEE TRANSACTIONS ON ELECTRON DEVICES LA English DT Article ID ARRAY AB A compressing photodetector structure suitable for detecting continuous wave and long pulsewidth optical signals is described for applications such as acousto-optical signal processing and machine vision. Subthreshold injection of carriers over a photodetector blooming gate is used to generate a compressing transfer characteristic. The photodetector transfer characteristic is integrating at low light levels and logarithmic compressing at higher light levels. The output voltage at which logarithmic compression becomes dominant may be adjusted in a range extending below 5 nW incident optical power by varying the bias voltage difference between the photodetector blooming and imaging gates. The predictions of simulated models that were developed correlate well with the experimental measurements. RP KUB, FJ (reprint author), USN,RES LAB,MICROELECTR DEVICE PHYS SECT,WASHINGTON,DC 20375, USA. NR 17 TC 7 Z9 7 U1 0 U2 0 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0018-9383 J9 IEEE T ELECTRON DEV JI IEEE Trans. Electron Devices PD OCT PY 1993 VL 40 IS 10 BP 1740 EP 1744 DI 10.1109/16.277329 PG 5 WC Engineering, Electrical & Electronic; Physics, Applied SC Engineering; Physics GA MA766 UT WOS:A1993MA76600005 ER PT J AU KIM, M SOVERO, EA HACKER, JB DELISIO, MP CHIAO, JC LI, SJ GAGNON, DR ROSENBERG, JJ RUTLEDGE, DB AF KIM, M SOVERO, EA HACKER, JB DELISIO, MP CHIAO, JC LI, SJ GAGNON, DR ROSENBERG, JJ RUTLEDGE, DB TI A 100-ELEMENT HBT GRID AMPLIFIER SO IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES LA English DT Article ID HETEROJUNCTION BIPOLAR-TRANSISTORS; PLANAR AB A 100-element 10-GHz grid amplifier has been developed. The active devices in the grid are chips with heterojunction-bipolar-transistor (HBT) differential-pairs. The metal grid pattern was empirically designed to provide effective coupling between the HBT's and free space. Two independent measurements, one with focusing lenses, the other without, were used to characterize the grid. In each case, the peak gain was 10 dB at 10 GHz with a 3-dB bandwidth of 1 GHz. The input and output return loss were better than 15 dB at 10 GHz. The maximum output power was 450 mW, and the minimum noise figure was 7 dB. By varying the bias, a signal could be amplitude modulated with a modulation index as large as 0.65. Tests show that the grid was quite tolerant of failures-the output power dropped by only 1 dB when 10% of the inputs were detuned. The grid amplifier is a multi-mode device that amplifies beams of different shapes and angles. Beams with incidence angles up to 30-degrees were amplified with less than a 3-dB drop in gain. C1 CALTECH,DEPT ELECT ENGN,PASADENA,CA 91125. ROCKWELL INT CORP,CTR SCI,THOUSAND OAKS,CA 91385. USN,CTR WEAP,DIV WARFARE NEAPONS,CHINA LAKE,CA 93555. HARVEY MUDD COLL,DEPT ENGN,CLAREMONT,CA 91711. NR 17 TC 58 Z9 59 U1 0 U2 3 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0018-9480 J9 IEEE T MICROW THEORY JI IEEE Trans. Microw. Theory Tech. PD OCT PY 1993 VL 41 IS 10 BP 1762 EP 1771 DI 10.1109/22.247921 PG 10 WC Engineering, Electrical & Electronic SC Engineering GA ML422 UT WOS:A1993ML42200013 ER PT J AU WANG, JJ KING, EE LEONOV, P HUANG, DH THOMPSON, P GODBEY, D AF WANG, JJ KING, EE LEONOV, P HUANG, DH THOMPSON, P GODBEY, D TI BONDED WAFER SUBSTRATES FOR INTEGRATED DETECTOR ARRAYS SO IEEE TRANSACTIONS ON NUCLEAR SCIENCE LA English DT Article ID FABRICATION AB Bonded wafer substrates have been made which are optimized for integrating high energy, particle detector arrays with their readout electronics. The detectors are processed in the handle wafer, which is a 300 mum thick, high resistivity, [111] crystal orientation silicon wafer. This wafer is bonded to a primary wafer using a low temperature process that does not affect the detector material. The support electronics are processed in the remnant of the primary wafer, which is a submicron thick [100] crystal orientation silicon film formed by a bond-and-etchback procedure. These two device materials are isolated from each other by a radiation hardened dielectric film. The integrated process is based on a low temperature, radiation hardened VLSI CMOS process which is also shown not to seriously affect the detector material. C1 USN,RES LAB,WASHINGTON,DC 20375. RP WANG, JJ (reprint author), ARACOR,425 LAKESIDE DR,SUNNYVALE,CA 94086, USA. NR 7 TC 1 Z9 1 U1 0 U2 0 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0018-9499 J9 IEEE T NUCL SCI JI IEEE Trans. Nucl. Sci. PD OCT PY 1993 VL 40 IS 5 BP 1342 EP 1346 DI 10.1109/23.234548 PG 5 WC Engineering, Electrical & Electronic; Nuclear Science & Technology SC Engineering; Nuclear Science & Technology GA LY724 UT WOS:A1993LY72400006 ER PT J AU SCHWIRZKE, F HALLAL, MP MARUYAMA, XK AF SCHWIRZKE, F HALLAL, MP MARUYAMA, XK TI ONSET OF BREAKDOWN AND FORMATION OF CATHODE SPOTS SO IEEE TRANSACTIONS ON PLASMA SCIENCE LA English DT Article ID VACUUM BREAKDOWN; SURFACES AB When an increasing diode voltage is applied, enhanced field,,emission of electrons begins from a growing number of small spots or whiskers on the cathode surface. This stimulates desorption of weakly bound adsorbates from the surface of a whisker. The cross section for ionization of the neutrals has a maximum for almost-equal-to 100 eV electrons. As the diode voltage increases, the 100 V equiptotential surface which moves towards the cathode is met by the desorbed neutrals moving away from the cathode. This results in the sharp risetime for the onset of ionization of desorbed neutrals by field emitted electrons. Positive ions produced in the ionization region, a few mum from the electron emitting spot are accelerated back to the electron emitting spot. This bombardment with almost-equal-to 100 eV ions leads to surface heating of the spot. Since the ion energy is deposited only within a few atomic layers at a time instead of an entire whisker volume, and since the neutral contaminants are only loosely bound to the surface, the onset of breakdown by this mechanism requires much less current than the Joule heating mechanism. The localized buildup of plasma above the electron emitting spot then naturally leads to pressure and electric field distributions which ignite unipolar arcs. The high current density of the unipolar arc and the associated surface heating by ions provide the ''explosive'' formation of a cathode spot plasma. RP SCHWIRZKE, F (reprint author), USN,POSTGRAD SCH,DEPT PHYS,MONTEREY,CA 93943, USA. NR 8 TC 19 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 0093-3813 J9 IEEE T PLASMA SCI JI IEEE Trans. Plasma Sci. PD OCT PY 1993 VL 21 IS 5 BP 410 EP 415 DI 10.1109/27.249617 PG 6 WC Physics, Fluids & Plasmas SC Physics GA MQ586 UT WOS:A1993MQ58600004 ER PT J AU MUKHERJEE, R CHEN, DG AF MUKHERJEE, R CHEN, DG TI CONTROL OF FREE-FLYING UNDERACTUATED SPACE MANIPULATORS TO EQUILIBRIUM MANIFOLDS SO IEEE TRANSACTIONS ON ROBOTICS AND AUTOMATION LA English DT Article AB Underactuated mechanisms will provide low cost automation and will easily overcome actuator failures. These mechanisms will be particularly useful for space applications because of their reduced mass and lower power consumption. In space underactuation can be effectively introduced in robot manipulators. Such mechanisms will however be difficult to control because of the fewer number of actuators in the system. Of theoretical interest to us, is the problem where the unactuated joints do not have brakes. It is shown that in such a situation it is possible to bring the system to a complete rest and converge the actuated joints to their desired values, provided the system maintains zero momentum and none of the unactuated joints are cyclic coordinates. Our main interest is to converge both the actuated and the unactuated joints to their desired set of values. For this purpose, we assume that the number of actuated joints are more than the number of unactuated joints, and the unactuated joints have brakes. It is shown that if there exists sufficient dynamical coupling between the set of actuated and unactuated joints it is possible to converge all the manipulator joints to their desired values. In the paper, the orientation of the space vehicle is not controlled because this task can be accomplished after the manipulator has been reconfigured, using methods already developed. C1 IOWA STATE UNIV SCI & TECHNOL, DEPT ELECT ENGN, AMES, IA 50011 USA. RP MUKHERJEE, R (reprint author), USN, SCH POSTGRAD, DEPT MECH ENGN, MONTEREY, CA 93943 USA. RI Mukherjee, Ranjan/A-7518-2009 NR 22 TC 37 Z9 43 U1 0 U2 5 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI PISCATAWAY PA 445 HOES LANE, PISCATAWAY, NJ 08855-4141 USA SN 1042-296X J9 IEEE T ROBOTIC AUTOM JI IEEE Trans. Robot. Autom. PD OCT PY 1993 VL 9 IS 5 BP 561 EP 570 DI 10.1109/70.258049 PG 10 WC Automation & Control Systems; Engineering, Electrical & Electronic; Robotics SC Automation & Control Systems; Engineering; Robotics GA MU755 UT WOS:A1993MU75500006 ER PT J AU ANDERSON, WT HARTNAGEL, HL KIRCHOEFER, SW AF ANDERSON, WT HARTNAGEL, HL KIRCHOEFER, SW TI NEW TUNNELING TRANSISTOR FOR CURRENT SWITCHING LOGIC SO INTERNATIONAL JOURNAL OF ELECTRONICS LA English DT Article ID INTERFACE; DONORS AB A new transistor structure is proposed and evaluated where between the source and drain electrodes of a two-dimensional-electron-gas transistor the Schottky gate electrode is replaced by an interband-tunnelling electrode which can discharge the 2DEG current if a suitable potential is applied. This structure can therefore also be considered as a switching device where current can either flow to the drain or into the tunnelling electrode. C1 USN,RES LAB,WASHINGTON,DC 20375. RP ANDERSON, WT (reprint author), TH DARMSTADT,INST HOCHFREQUENZTECH,MERCKSTR 25,W-6100 DARMSTADT,GERMANY. NR 9 TC 0 Z9 0 U1 0 U2 0 PU TAYLOR & FRANCIS LTD PI LONDON PA ONE GUNDPOWDER SQUARE, LONDON, ENGLAND EC4A 3DE SN 0020-7217 J9 INT J ELECTRON JI Int. J. Electron. PD OCT PY 1993 VL 75 IS 4 BP 641 EP 645 DI 10.1080/00207219308907139 PG 5 WC Engineering, Electrical & Electronic SC Engineering GA MA583 UT WOS:A1993MA58300006 ER PT J AU PAYNE, RD MATTESON, MA MORAN, AL AF PAYNE, RD MATTESON, MA MORAN, AL TI APPLICATION OF NEURAL NETWORKS IN SPRAY FORMING TECHNOLOGY SO INTERNATIONAL JOURNAL OF POWDER METALLURGY LA English DT Article AB Recent work in the intelligent spray forming program at the Naval Surface Warfare Center has led to the development of a surface roughness sensor for the measure of real time spray formed part quality. Artificial neural networks were used to correlate test run data from this surface roughness sensor and other sensors with spray formed preform characteristics. Neural networks can mimic a human operator's thought process and in this study were successfully used to predict values for process outputs. C1 JOHNS HOPKINS UNIV,DEPT MAT SCI & ENGN,BALTIMORE,MD 21218. USN ACAD,DEPT MECH ENGN,ANNAPOLIS,MD 21402. RP PAYNE, RD (reprint author), USN,CTR SURFACE WARFARE,CARDEROCK DIV,ANNAPOLIS DETACHMENT,ANNAPOLIS,MD 21402, USA. NR 6 TC 13 Z9 16 U1 0 U2 0 PU AMER POWDER METALLURGY INST PI PRINCETON PA 105 COLLEGE ROAD EAST, PRINCETON, NJ 08540 SN 0888-7462 J9 INT J POWDER METALL JI Int. J. Powder Metall. PD OCT PY 1993 VL 29 IS 4 BP 345 EP 351 PG 7 WC Metallurgy & Metallurgical Engineering SC Metallurgy & Metallurgical Engineering GA ME846 UT WOS:A1993ME84600006 ER PT J AU JONES, KL ODDERSTOL, ES WETTERAU, GE CLARK, MM AF JONES, KL ODDERSTOL, ES WETTERAU, GE CLARK, MM TI USING A HYDRAULIC MODEL TO PREDICT HOLLOW-FIBER UF PERFORMANCE SO JOURNAL AMERICAN WATER WORKS ASSOCIATION LA English DT Article ID ULTRAFILTRATION; ORGANICS; FLUX AB A hydraulic model was developed to determine all flows and pressures in a continuous-flow hollow-fiber ultrafiltration (UF) system. A pilot-scale UF system was constructed to test the validity of the model. Deionized water was filtered through the system to simulate nonfouling conditions, and two colloidal suspensions of powdered activated carbon and clay simulated fouling conditions. All flows and pressures were continuously logged for later analysis. For fouling conditions, the flux was described by the resistance-in-series model, and a relationship was developed to describe the increase in effective membrane resistance as a function of time. This fitted function was then input into the hydraulic model to predict the flows and pressures in the system under nonsteady fouling conditions. For nonfouling and fouling conditions, the predicted flows and pressures correlated well with the system flows and pressures. C1 UNIV ILLINOIS,DEPT CIVIL ENGN,205 N MATHEWS AVE,URBANA,IL 61801. JOHNS HOPKINS UNIV,BALTIMORE,MD 21218. USN,SUBMARINE BASE,NEW LONDON,CT. RI Clark, Mark /E-3509-2010 NR 10 TC 11 Z9 11 U1 1 U2 2 PU AMER WATER WORKS ASSOC PI DENVER PA 6666 W QUINCY AVE, DENVER, CO 80235 SN 0003-150X J9 J AM WATER WORKS ASS JI J. Am. Water Work Assoc. PD OCT PY 1993 VL 85 IS 10 BP 87 EP 97 PG 11 WC Engineering, Civil; Water Resources SC Engineering; Water Resources GA MN378 UT WOS:A1993MN37800012 ER PT J AU DEVEAUD, B SERMAGE, B KATZER, DS AF DEVEAUD, B SERMAGE, B KATZER, DS TI FREE-EXCITON VERSUS FREE-CARRIER LUMINESCENCE IN A QUANTUM-WELL SO JOURNAL DE PHYSIQUE IV LA English DT Article; Proceedings Paper CT 3rd International Conference on Optics of Excitons in Confined Systems CY AUG 30-SEP 02, 1993 CL UNIV MONTPELLIER II, MONTPELLIER, FRANCE SP UNIV MONTPELLIER II, CNRS, COMMISS COMMUNAUTES EUROPEENNES, DELEGAT GEN ARMEMENT, CTR NATL ETUDE TELECOMMUN, CONSEIL REG LANGUEDOC ROUSSILLON, MONTPELLIER DIST, CONSEIL GEN HERAULT, IBM, ISA RIBER HO UNIV MONTPELLIER II ID RADIATIVE RECOMBINATION; OPTICAL CHARACTERIZATION; DEPENDENCE; TEMPERATURE; INTERFACE; LIFETIMES AB Radiative recombination of an exciton in a quantum well is highly probable due to the removal of the k selection rule in the z-direction. As a consequence, this radiation path dominates over the free carrier recombination which is difficult to observe. We succeed in obtaining separately the free carrier luminescence and the exciton luminescence and deduce an exciton formation time of the order of 200 ps, in agreement with theoretical expectations. C1 FRANCE TELECOM,CNET BAGNEUX,F-92220 BAGNEUX,FRANCE. USN,RES LAB,WASHINGTON,DC 20375. RP DEVEAUD, B (reprint author), FRANCE TELECOM,CNET LANNION,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 15 TC 9 Z9 9 U1 0 U2 0 PU EDITIONS PHYSIQUE PI LES ULIS CEDEX PA Z I DE COURTABOEUF AVE 7 AV DU HOGGAR, BP 112, 91944 LES ULIS CEDEX, FRANCE SN 1155-4339 J9 J PHYS IV JI J. Phys. IV PD OCT PY 1993 VL 3 IS C5 BP 11 EP 14 DI 10.1051/jp4:1993502 PG 4 WC Physics, Multidisciplinary SC Physics GA ML215 UT WOS:A1993ML21500003 ER PT J AU SERMAGE, B LONG, S DEVEAUD, B KATZER, DS AF SERMAGE, B LONG, S DEVEAUD, B KATZER, DS TI LIFETIME OF EXCITONS IN GAAS QUANTUM-WELLS SO JOURNAL DE PHYSIQUE IV LA English DT Article; Proceedings Paper CT 3rd International Conference on Optics of Excitons in Confined Systems CY AUG 30-SEP 02, 1993 CL UNIV MONTPELLIER II, MONTPELLIER, FRANCE SP UNIV MONTPELLIER II, CNRS, COMMISS COMMUNAUTES EUROPEENNES, DELEGAT GEN ARMEMENT, CTR NATL ETUDE TELECOMMUN, CONSEIL REG LANGUEDOC ROUSSILLON, MONTPELLIER DIST, CONSEIL GEN HERAULT, IBM, ISA RIBER HO UNIV MONTPELLIER II AB Time resolved luminescence measurements under resonant excitation were performed at 10 K on the free exciton in very high quality GaAs-AlAs quantum wells. At resonance, the luminescence intensity is increased by two orders of magnitude, and the decay is short. The radiative lifetime of the excitons in the radiant states is about 18 ps in agreement with the theory of Hanamura and Andreani. C1 FRANCE TELECOM,CNET,LAB,F-22300 LANNION,FRANCE. USN,RES LAB,WASHINGTON,DC 20375. RP SERMAGE, B (reprint author), FRANCE TELECOM,CNET,PAB,196 AVE HENRI RAVERA,F-92220 BAGNEUX,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 15 TC 17 Z9 17 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 OCT PY 1993 VL 3 IS C5 BP 19 EP 25 DI 10.1051/jp4:1993504 PG 7 WC Physics, Multidisciplinary SC Physics GA ML215 UT WOS:A1993ML21500005 ER PT J AU PAUL, BD MCKINLEY, RM WALSH, JK JAMIR, TS PAST, MR AF PAUL, BD MCKINLEY, RM WALSH, JK JAMIR, TS PAST, MR TI EFFECT OF FREEZING ON THE CONCENTRATION OF DRUGS OF ABUSE IN URINE SO JOURNAL OF ANALYTICAL TOXICOLOGY LA English DT Note ID CAPILLARY GAS-CHROMATOGRAPHY; QUANTITATION; METABOLITE; ACID RP PAUL, BD (reprint author), USN,DRUG SCREENING LAB,1321 GILBERT ST,NORFOLK,VA 23511, USA. NR 5 TC 33 Z9 34 U1 1 U2 2 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 OCT PY 1993 VL 17 IS 6 BP 378 EP 380 PG 3 WC Chemistry, Analytical; Toxicology SC Chemistry; Toxicology GA LZ152 UT WOS:A1993LZ15200012 PM 8271786 ER PT J AU ALLISS, RJ SANDLIN, GD CHANG, SW RAMAN, S AF ALLISS, RJ SANDLIN, GD CHANG, SW RAMAN, S TI APPLICATIONS OF SSM/I DATA IN THE ANALYSIS OF HURRICANE FLORENCE (1988) SO JOURNAL OF APPLIED METEOROLOGY LA English DT Article AB Data from the Special Sensor Microwave/Imager (SSM/I) on board a Defense Meteorological Satellite Program satellite are used to study the precipitation patterns and wind fields associated with Hurricane Florence (1988). SSM/I estimates indicate that the intensification of Florence was coincident with the increase in total latent heat release. Additionally, an increase in the concentration and areal coverage of heavier rain rates near the center is observed. SSM/I marine surface winds of Florence are examined and compared to in situ data, and to an enhanced objective isotach analysis over the Gulf of Mexico. Results indicate that the SSM/I winds are weaker than those depicted in the enhanced objective analysis and slightly stronger than in situ observations. Finally, center positions of Florence are estimated using the 85-GHz brightness-temperature imagery. Much improved estimates are achieved using this imagery compared to using GOES infrared imagery. These results concur with previous studies that applications of SSM/I data could be valuable in augmenting current methods of tropical cyclone analysis. C1 USN,RES LAB,CODE 7225,WASHINGTON,DC 20375. N CAROLINA STATE UNIV,DEPT MARINE EARTH & ATMOSPHER SCI,RALEIGH,NC 27695. NR 10 TC 7 Z9 9 U1 0 U2 0 PU AMER METEOROLOGICAL SOC PI BOSTON PA 45 BEACON ST, BOSTON, MA 02108-3693 SN 0894-8763 J9 J APPL METEOROL JI J. Appl. Meteorol. PD OCT PY 1993 VL 32 IS 10 BP 1581 EP 1591 DI 10.1175/1520-0450(1993)032<1581:AOSDIT>2.0.CO;2 PG 11 WC Meteorology & Atmospheric Sciences SC Meteorology & Atmospheric Sciences GA LY373 UT WOS:A1993LY37300001 ER PT J AU QI, N HAMMER, DA APRUZESE, JP AF QI, N HAMMER, DA APRUZESE, JP TI MODELING THE COAXIAL DOUBLE Z-PINCH FOR THE AL-XI - MG-IX LASER AT 228 ANGSTROM SO JOURNAL OF APPLIED PHYSICS LA English DT Article ID RAY LASER; POPULATION-INVERSION; GAIN; ULTRAVIOLET; EMISSION; IONS; AMPLIFICATION; IONIZATION; IMPLOSIONS; PLASMAS AB A magnetically embedded coaxial z-pinch configuration is proposed for the resonant photoexcitation laser at 228 angstrom in Mg IX pumped by the 48.338 angstrom line of A1 XI. This laser configuration consists of an annular Al z-pinch plasma imploded (final electron density of about 10(20) cm-3) onto an inner, Mg plasma (final electron density of about 10(18) cm-3) on the axis. The Mg plasma is confined and stabilized by an axial magnetic B(z) field, which is compressed to a final magnitude of about 130 T from an initially applied field of about 1 T by the Al implosion, thus serving to stabilize and physically separate the Al and Mg plasmas. Separate numerical simulations of the Al and Mg plasmas designed to guide exploratory experiments are reported. A OD dynamic z-pinch model captures the Al implosion, including trapped B(z) field and power losses due to line radiation. Initial conditions required to produce the intense A1 XI pump line at 48.338 angstrom are derived assuming an 800 kA, 100 ns implosion current pulse. Assuming a pinch length of 2 cm, a pump power of 3.5 GW/eV is predicted for the 48.338 angstrom A1 XI line. With the pump so defined, a separate, detailed atomic physics model is used to study the photoexcitation kinetics in the Mg ix lasant plasma. It is found that a gain of 1.0-1.5 cm-1 is obtainable on the 2s3d 1D2 - 2s4f F-1(3) transition at 228 angstrom in Mg IX. C1 CORNELL UNIV, PLASMA STUDIES LAB, ITHACA, NY 14853 USA. USN, RES LAB, DIV PLASMA PHYS, RADIAT HYDRODYNAM BRANCH, WASHINGTON, DC 20375 USA. NR 53 TC 3 Z9 3 U1 0 U2 0 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 OCT 1 PY 1993 VL 74 IS 7 BP 4303 EP 4309 DI 10.1063/1.354394 PG 7 WC Physics, Applied SC Physics GA MB177 UT WOS:A1993MB17700003 ER PT J AU EASTER, DC BARONAVSKI, AP HAWLEY, M AF EASTER, DC BARONAVSKI, AP HAWLEY, M TI A SPECTROSCOPIC INVESTIGATION OF THE NONRIGID RIGID TRANSITION OF (BENZENE)(13) DURING FREE JET EXPANSION SO JOURNAL OF CHEMICAL PHYSICS LA English DT Article ID ARGON CLUSTERS; BENZENE CLUSTERS; SELECTIVE SPECTROSCOPY; ELECTRON-DIFFRACTION; MOLECULAR CLUSTERS; SOLVENT CLUSTERS; SUPERSONIC JETS; PHASE-CHANGES; DYNAMICS; NAPHTHALENE AB We have traced the evolution of the benzene-h6 transition in (C6H6) (C6D6)12 as a function of time (distance from the nozzle) in a supersonic expansion. Taking advantage of the special properties of the isotopically substituted (benzene)13 resonant two-photon ionization spectrum, we present the first experimental evidence for a nonrigid-rigid transition in a single-size molecular cluster. Initially, under the conditions of our free-jet expansion, (benzene)13 Condenses in a nonrigid form, then solidifies into a well-defined structural configuration. C1 USN,RES LAB,DIV CHEM,WASHINGTON,DC 20375. NR 41 TC 12 Z9 12 U1 0 U2 0 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0021-9606 J9 J CHEM PHYS JI J. Chem. Phys. PD OCT 1 PY 1993 VL 99 IS 7 BP 4942 EP 4951 DI 10.1063/1.466043 PG 10 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA LY603 UT WOS:A1993LY60300006 ER PT J AU GRAY, GC STRUEWING, JP HYAMS, KC ESCAMILLA, J TUPPONCE, AK KAPLAN, EL AF GRAY, GC STRUEWING, JP HYAMS, KC ESCAMILLA, J TUPPONCE, AK KAPLAN, EL TI INTERPRETING A SINGLE ANTISTREPTOLYSIN-O TEST - A COMPARISON OF THE UPPER LIMIT OF NORMAL AND LIKELIHOOD RATIO METHODS SO JOURNAL OF CLINICAL EPIDEMIOLOGY LA English DT Article DE ANTISTREPTOLYSIN-O; STREPTOCOCCUS-PYOGENES; LIKELIHOOD RATIO; UPPER LIMIT OF NORMAL; RHEUMATIC FEVER; INFECTION ID STREPTOCOCCAL PHARYNGITIS; CARRIER STATE; INFECTION; DIAGNOSIS AB Single serologic tests may occasionally influence clinicians in making diagnoses. The antistreptolysin 0 (ASO) test is a frequently used tool for detecting recent Streptococcus pyogenes infection and is helpful in the diagnosis of diseases like rheumatic fever. Using data from a 1989 prospective study of 600 healthy male military recruits, in which 43% experienced S. pyogenes upper respiratory tract infection (2-dilution rise in ASO), this report compared two methods of interpreting a single ASO titer. Using the ''upper limit of normal'' (80 percentile) method, recruits with an ASO titer of greater than 400 showed evidence of recent S. pyogenes infection. This method had a sensitivity and specificity of only 65.9 and 81.9% respectively. In contrast to the ''yes-no'' dichotomy of the ''upper limit of normal'' method, the likelihood ratio method statistics were ASO value specific, more consistent with clinical judgment, and better emphasized the caution clinicians must use in interpreting a single ASO test. C1 USN,MED RES UNIT 3,CAIRO,EGYPT. USN,ENVIRONM & PREVENT MED UNIT 5,SAN DIEGO,CA 92136. USN,MED RES INST,BETHESDA,MD 20814. USN,ENVIRONM & PREVENT MED UNIT 6,HONOLULU,HI 96860. USN,ENVIRONM & PREVENT MED UNIT 5,SAN DIEGO,CA 92136. UNIV MINNESOTA,WHO,CULLABORATING CTR REFERENCE & RES STREPTOCOCCI,DEPT PEDIAT,MINNEAPOLIS,MN 55455. RI Struewing, Jeffery/C-3221-2008; Struewing, Jeffery/I-7502-2013 OI Struewing, Jeffery/0000-0002-4848-3334 NR 13 TC 16 Z9 17 U1 0 U2 0 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0895-4356 J9 J CLIN EPIDEMIOL JI J. Clin. Epidemiol. PD OCT PY 1993 VL 46 IS 10 BP 1181 EP 1185 DI 10.1016/0895-4356(93)90117-J PG 5 WC Health Care Sciences & Services; Public, Environmental & Occupational Health SC Health Care Sciences & Services; Public, Environmental & Occupational Health GA MC571 UT WOS:A1993MC57100015 PM 8410102 ER PT J AU SINKOVITS, RS BORIS, JP ORAN, ES AF SINKOVITS, RS BORIS, JP ORAN, ES TI A TECHNIQUE FOR REGULARIZING THE STRUCTURE OF A MONOTONIC LAGRANGIAN GRID SO JOURNAL OF COMPUTATIONAL PHYSICS LA English DT Note ID SIMULATIONS; NEIGHBORS RP SINKOVITS, RS (reprint author), USN,RES LAB,COMP PHYS & FLUID DYNAM LAB,WASHINGTON,DC 20375, USA. NR 12 TC 4 Z9 4 U1 0 U2 0 PU ACADEMIC PRESS INC JNL-COMP SUBSCRIPTIONS PI SAN DIEGO PA 525 B ST, STE 1900, SAN DIEGO, CA 92101-4495 SN 0021-9991 J9 J COMPUT PHYS JI J. Comput. Phys. PD OCT PY 1993 VL 108 IS 2 BP 368 EP 372 DI 10.1006/jcph.1993.1190 PG 5 WC Computer Science, Interdisciplinary Applications; Physics, Mathematical SC Computer Science; Physics GA MC593 UT WOS:A1993MC59300016 ER PT J AU HOFF, HA AF HOFF, HA TI SPECIAL ISSUE ON HIGH-TEMPERATURE SUPERCONDUCTORS - FOREWORD SO JOURNAL OF ELECTRONIC MATERIALS LA English DT Editorial Material RP HOFF, HA (reprint author), USN,RES LAB,DIV MAT SCI & TECHNOL,WASHINGTON,DC 20375, USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU MINERALS METALS MATERIALS SOC PI WARRENDALE PA 420 COMMONWEALTH DR, WARRENDALE, PA 15086 SN 0361-5235 J9 J ELECTRON MATER JI J. Electron. Mater. PD OCT PY 1993 VL 22 IS 10 BP 1181 EP 1181 DI 10.1007/BF02818057 PG 1 WC Engineering, Electrical & Electronic; Materials Science, Multidisciplinary; Physics, Applied SC Engineering; Materials Science; Physics GA MA738 UT WOS:A1993MA73800001 ER PT J AU AGASSI, D BARDO, RD AF AGASSI, D BARDO, RD TI FLUX-PINNING IN A SLAB MODEL OF GRAIN AND TWIN BOUNDARIES SO JOURNAL OF ELECTRONIC MATERIALS LA English DT Article; Proceedings Paper CT SYMP ON HIGH TEMPERATURE SUPERCONDUCTORS, AT THE 122ND ANNUAL MEETING OF THE METALLURGICAL-SOC CY FEB, 1993 CL DENVER, CO SP METALLURG SOC DE CRITICAL CURRENTS; FLUX PINNING; GRAIN BOUNDARY; S-S'-S JUNCTION; SUPERCONDUCTIVITY; TWIN BOUNDARY ID YBA2CU3O7-DELTA SINGLE-CRYSTALS; BICRYSTALS; SUPERCONDUCTORS; TRANSPORT; BEHAVIOR AB The flux pinning potential and critical current of a grain and a twin boundary are evaluated for a S-S'-S junction model and a configuration of parallel magnetic field and junction plane. In the grain boundary model, the S' domain is assumed to be disordered, to mimic oxygen disorder. Large critical currents almost-equal-to O(10(6) amp/cm2) are estimated for both models. The grain boundary model exhibits a ''nonweak'' link behavior and moderate critical current dependence on the grain misalignment angle. We briefly dicuss an approach to enhance critical currents based on our grain boundary model. RP AGASSI, D (reprint author), USN,CTR SURFACE WARFARE,DD,WHITE OAK,MD, USA. NR 24 TC 1 Z9 1 U1 0 U2 1 PU MINERALS METALS MATERIALS SOC PI WARRENDALE PA 420 COMMONWEALTH DR, WARRENDALE, PA 15086 SN 0361-5235 J9 J ELECTRON MATER JI J. Electron. Mater. PD OCT PY 1993 VL 22 IS 10 BP 1221 EP 1225 DI 10.1007/BF02818064 PG 5 WC Engineering, Electrical & Electronic; Materials Science, Multidisciplinary; Physics, Applied SC Engineering; Materials Science; Physics GA MA738 UT WOS:A1993MA73800008 ER PT J AU RICHARDS, LE HOFF, HA AGGARWAL, PK AF RICHARDS, LE HOFF, HA AGGARWAL, PK TI GRAIN-GROWTH OF HIGH T(C) YBA2CU3O7-X SO JOURNAL OF ELECTRONIC MATERIALS LA English DT Article; Proceedings Paper CT SYMP ON HIGH TEMPERATURE SUPERCONDUCTORS, AT THE 122ND ANNUAL MEETING OF THE METALLURGICAL-SOC CY FEB, 1993 CL DENVER, CO SP METALLURG SOC DE GRAIN GROWTH; GRAIN SIZE; LOGNORMAL; RATE CONSTANT; OXYGENATION ID SUPERCONDUCTORS AB Grain growth during sintering of the polycrystalline high onset temperature superconductor YBa2Cu3O7-x has been examined by measuring grain sizes at various temperatures for different times above 900-degrees-C. The grain size distribution is found to be predominately lognormal after some sintering time. The mean grain size increases with both temperature and time. The standard deviation of the grain size distribution increases with temperature, but appears to be independent of time. The grain growth law may have an exponent of five. The grain growth rate may be affected by the grain size of the calcined powder. RP RICHARDS, LE (reprint author), USN,RES LAB,DIV MAT SCI & TECHNOL,WASHINGTON,DC 20375, USA. NR 24 TC 7 Z9 7 U1 0 U2 1 PU MINERALS METALS MATERIALS SOC PI WARRENDALE PA 420 COMMONWEALTH DR, WARRENDALE, PA 15086 SN 0361-5235 J9 J ELECTRON MATER JI J. Electron. Mater. PD OCT PY 1993 VL 22 IS 10 BP 1233 EP 1239 DI 10.1007/BF02818066 PG 7 WC Engineering, Electrical & Electronic; Materials Science, Multidisciplinary; Physics, Applied SC Engineering; Materials Science; Physics GA MA738 UT WOS:A1993MA73800010 ER PT J AU HOFF, HA TOTH, LE FILIPKOWSKI, ME VOLD, CL LAWRENCE, SH MASUMURA, RA LECHTER, WL SMITH, DK AF HOFF, HA TOTH, LE FILIPKOWSKI, ME VOLD, CL LAWRENCE, SH MASUMURA, RA LECHTER, WL SMITH, DK TI MODEL FOR THE OXYGENATION OF THE YBA2CU3O7-X 90K SUPERCONDUCTOR SO JOURNAL OF ELECTRONIC MATERIALS LA English DT Article; Proceedings Paper CT SYMP ON HIGH TEMPERATURE SUPERCONDUCTORS, AT THE 122ND ANNUAL MEETING OF THE METALLURGICAL-SOC CY FEB, 1993 CL DENVER, CO SP METALLURG SOC DE DIFFUSION; GRAIN GROWTH; OXYGEN; PHASE CONTENT; SINGLE CRYSTALS; SIZE DISTRIBUTION ID TRACER DIFFUSION; SINGLE-CRYSTALS; TEMPERATURE; GROWTH AB A model incorporating the thermodynamic equilibrium oxygen content, oxygen in-diffusion, and oxide phases for the oxygenation of the YBaCu3O7-x is described. For sintered polycrystals, grain growth and the resulting grain size distribution are included. The model is used to calculate the volume percent of each oxide phase for several processing conditions of sintered specimens and is compared with available results on the quantification of phases present. Such a comparison indicates that as the concentration of impurity phases increases so does the concentration of the less oxygenated 123 phases, suggesting that impurities coating 123 grains act as oxygen indiffusion barriers. The model is also used to investigate the uniformity of the oxygen content in large twinned and detwinned single crystals such as have been used for measuring superconductivity parameters. C1 SFA INC,LANDOVER,MD 20875. PENN STATE UNIV,UNIV PK,PA 16802. RP HOFF, HA (reprint author), USN,RES LAB,DIV MAT SCI & TECHNOL,WASHINGTON,DC 20375, USA. NR 31 TC 6 Z9 6 U1 0 U2 0 PU MINERALS METALS MATERIALS SOC PI WARRENDALE PA 420 COMMONWEALTH DR, WARRENDALE, PA 15086 SN 0361-5235 J9 J ELECTRON MATER JI J. Electron. Mater. PD OCT PY 1993 VL 22 IS 10 BP 1241 EP 1249 DI 10.1007/BF02818067 PG 9 WC Engineering, Electrical & Electronic; Materials Science, Multidisciplinary; Physics, Applied SC Engineering; Materials Science; Physics GA MA738 UT WOS:A1993MA73800011 ER PT J AU GUBSER, DU FRANCAVILLA, TL SOULEN, RJ MITCHELL, DL AF GUBSER, DU FRANCAVILLA, TL SOULEN, RJ MITCHELL, DL TI HIGH-TEMPERATURE SUPERCONDUCTIVITY - MAGNETS AND APPLICATIONS OF NAVAL INTEREST SO JOURNAL OF ELECTRONIC MATERIALS LA English DT Article; Proceedings Paper CT SYMP ON HIGH TEMPERATURE SUPERCONDUCTORS, AT THE 122ND ANNUAL MEETING OF THE METALLURGICAL-SOC CY FEB, 1993 CL DENVER, CO SP METALLURG SOC DE CRITICAL CURRENTS; MAGNETO-HYDRODYNAMIC-PROPULSION; MAGNETS; NEON; WIRE AB The Navy has had a long standing interest in power applications of superconductivity. Recent advances in high temperature superconducting (HTS) materials have caused the Navy science and technology community to assess the potential of HTS magnets for Naval applications. A program has begun to test HTS conductors and magnets in order to determine realistic performance expectations from which to determine proper systems integration. This paper presents some early results of industrially produced HTS magnets and discusses possible Naval applications. Speculative application toward magneto-hydrodynamic (MHD) propulsion is also discussed-specifically with respect to HTS materials. C1 MITCHELL ASSOCIATES,WASHINGTON,DC 20375. RP GUBSER, DU (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 8 TC 0 Z9 0 U1 0 U2 1 PU MINERALS METALS MATERIALS SOC PI WARRENDALE PA 420 COMMONWEALTH DR, WARRENDALE, PA 15086 SN 0361-5235 J9 J ELECTRON MATER JI J. Electron. Mater. PD OCT PY 1993 VL 22 IS 10 BP 1305 EP 1309 DI 10.1007/BF02818078 PG 5 WC Engineering, Electrical & Electronic; Materials Science, Multidisciplinary; Physics, Applied SC Engineering; Materials Science; Physics GA MA738 UT WOS:A1993MA73800022 ER PT J AU CANRIGHT, D MORRIS, S AF CANRIGHT, D MORRIS, S TI BUOYANT INSTABILITY OF A VISCOUS FILM OVER A PASSIVE FLUID SO JOURNAL OF FLUID MECHANICS LA English DT Article ID RAYLEIGH-TAYLOR INSTABILITY; MODEL; LAYER AB In certain geophysical contexts such as lava lakes and mantle convection, a cold, viscous boundary layer forms over a deep pool. The following model problem investigates the buoyant instability of the layer. Beneath a shear-free horizontal boundary, a thin layer (thickness d1) of very viscous fluid overlies a deep layer of less dense, much less viscous fluid; inertia and surface tension are negligible. After the initial unstable equilibrium is perturbed, a long-wave analysis describes the growth of the disturbance, including the nonlinear effects of large amplitude. The results show that nonlinear effects greatly enhance growth, so that initial local maxim in the thickness of the viscous film grow to infinite thickness in finite time, with a timescale 8mu/DELTArhogd1. In the final catastrophic growth the peak thickness is inversely proportional to the remaining time. (A parallel analysis for fluids with power-law rheology shows similar catastrophic growth.) While the small-slope approximation must fail before this singular time, the failure is only local, and a similarity solution describes how the peaks become downwelling plumes as the viscous film drains away. C1 UNIV CALIF BERKELEY, DEPT MECH ENGN, BERKELEY, CA 94720 USA. RP USN, POSTGRAD SCH, MONTEREY, CA 93943 USA. NR 28 TC 27 Z9 27 U1 0 U2 4 PU CAMBRIDGE UNIV PRESS PI NEW YORK PA 32 AVENUE OF THE AMERICAS, NEW YORK, NY 10013-2473 USA SN 0022-1120 EI 1469-7645 J9 J FLUID MECH JI J. Fluid Mech. PD OCT PY 1993 VL 255 BP 349 EP 372 DI 10.1017/S0022112093002514 PG 24 WC Mechanics; Physics, Fluids & Plasmas SC Mechanics; Physics GA MF298 UT WOS:A1993MF29800016 ER PT J AU GILARDI, R GEORGE, C KARLE, J EATON, PE FISHER, AM AF GILARDI, R GEORGE, C KARLE, J EATON, PE FISHER, AM TI AZA-ANALOGS OF CAGE COMPOUNDS - POTENTIAL PRECURSORS TO AZACUBANES AND 1-AZAHOMOCUBANES SO JOURNAL OF HETEROCYCLIC CHEMISTRY LA English DT Article ID BRIDGEHEAD NITROGEN AB Exploration of the reactions of the 9-azahomocubane system led to derivatives of two small-ring systems containing aza-bridging atoms, 5-azatetracyclo[4.2.0.0(3,8).0(4,7)]octane and 9-azatetracyclo[4.3.0.0(2,5).0(4,7)]nonane. The structures were characterized by X-ray diffraction analyses. There are no prior X-ray structural reports on these systems. C1 UNIV CHICAGO,DEPT CHEM,CHICAGO,IL 60637. RP GILARDI, R (reprint author), USN,RES LAB,STRUCT MATTER LAB,WASHINGTON,DC 20375, USA. NR 15 TC 2 Z9 2 U1 1 U2 1 PU HETERO CORPORATION PI TAMPA PA BOX 20285, TAMPA, FL 33622-0285 SN 0022-152X J9 J HETEROCYCLIC CHEM JI J. Heterocycl. Chem. PD OCT-NOV PY 1993 VL 30 IS 5 BP 1385 EP 1388 PG 4 WC Chemistry, Organic SC Chemistry GA MM424 UT WOS:A1993MM42400035 ER PT J AU GILARDI, R GEORGE, C KARLE, J EATON, PE RAO, M AF GILARDI, R GEORGE, C KARLE, J EATON, PE RAO, M TI AZIDOCARBONYL-SUBSTITUTED CUBANOUREAS SO JOURNAL OF HETEROCYCLIC CHEMISTRY LA English DT Article ID CHEMISTRY AB Despite the angular strain associated with the assembly of small rings, 1,2-diisocyanatocubane reacts with trimethylsilyl azide under mild conditions to form a hexacyclic ring assembly that contains an imidazolidone ring fused to one edge of cubane. This compound was identified as an azidocarbonyl-substituted cubanourea by means of X-ray crystal structure analysis of the nitro-derivative, the energetic compound N-azidocarbonyl-nitrocubanourea. C1 UNIV CHICAGO,DEPT CHEM,CHICAGO,IL 60637. RP GILARDI, R (reprint author), USN,RES LAB,STRUCT MATTER LAB,WASHINGTON,DC 20375, USA. NR 12 TC 3 Z9 3 U1 1 U2 3 PU HETERO CORPORATION PI TAMPA PA BOX 20285, TAMPA, FL 33622-0285 SN 0022-152X J9 J HETEROCYCLIC CHEM JI J. Heterocycl. Chem. PD OCT-NOV PY 1993 VL 30 IS 5 BP 1389 EP 1391 PG 3 WC Chemistry, Organic SC Chemistry GA MM424 UT WOS:A1993MM42400036 ER PT J AU LINDSTEN, T LEE, KP HARRIS, ES PETRYNIAK, B CRAIGHEAD, N REYNOLDS, PJ LOMBARD, DB FREEMAN, GJ NADLER, LM GRAY, GS THOMPSON, CB JUNE, CH AF LINDSTEN, T LEE, KP HARRIS, ES PETRYNIAK, B CRAIGHEAD, N REYNOLDS, PJ LOMBARD, DB FREEMAN, GJ NADLER, LM GRAY, GS THOMPSON, CB JUNE, CH TI CHARACTERIZATION OF CTLA-4 STRUCTURE AND EXPRESSION ON HUMAN T-CELLS SO JOURNAL OF IMMUNOLOGY LA English DT Article ID ACTIVATION ANTIGEN B7; IG-SUPERFAMILY GENES; HUMAN LYMPHOCYTES-T; CD28 MESSENGER-RNA; COSTIMULATORY SIGNAL; PROLIFERATIVE RESPONSES; GENOMIC ORGANIZATION; CHROMOSOMAL LOCATION; INTERLEUKIN-2; SURFACE AB CTLA-4 is an adhesion receptor expressed on activated T cells. The amino acid sequence of CTLA-4 is related to CD28, and although the function of CTLA-4 remains unknown, it shares several features with CD28, including a common counter-receptor, B7, that is present on Ag-presenting cells. In a recent study we found that CD28 and CTLA-4 were coexpressed at the mRNA level on activated T cells but that only CD28 was expressed on resting T cells. Here we show that within the T cell population, CTLA-4 expression is restricted to the subset of T cells that also express cell surface CD28. CTLA-4 mRNA expression can be induced on quiescent T cells via phorbol ester-mediated activation of protein kinase C but not with calcium ionophore treatment alone. Phorbol ester-induced expression of CTLA-4 mRNA could be enhanced with calcium ionophore treatment, and treatment of cells in this manner resulted in a reciprocal decrease in expression of CD28 mRNA. Ligation of CD28 with monoclonal antibody also resulted in the specific and rapid induction of CTLA-4 mRNA. To study the expression of CTLA-4 at the protein level, a rabbit antiserum against a recombinant protein derived from CTLA-4 cDNA was generated. When activated T cells were labeled with [S-35]methionine, the rabbit antiserum precipitated a 41- to 43-kDa protein from whole cell lysates. Similar results were found when detergent-soluble lysates from I-125 surface-labeled resting and activated T cells were analyzed by SDS-PAGE. Surprisingly, under the conditions tested, CTLA-4 migrated primarily as a monomer at the cell surface, and could not be shown to exist as a disulfide-bonded homodimer or as a heterodimer consisting of CTLA-4 and CD28. These results suggest that B7 can bind to T cells via distinct receptor complexes consisting of either CD28 or CTLA-4, and that these complexes may potentially mediate distinct biologic functions. Further, the present results suggest that noncovalent interactions might mediate association of CTLA-4 and/or CD28 at the cell surface. C1 UNIV MICHIGAN,DEPT PATHOL,ANN ARBOR,MI 48109. UNIV MICHIGAN,DEPT MED,ANN ARBOR,MI 48109. UNIV MICHIGAN,DEPT MICROBIOL IMMUNOL,ANN ARBOR,MI 48109. UNIV MICHIGAN,HOWARD HUGHES MED INST,ANN ARBOR,MI 48109. HARVARD UNIV,SCH MED,DANA FARBER CANC INST,DIV TUMOR IMMUNOL,BOSTON,MA 02115. HARVARD UNIV,SCH MED,BOSTON,MA 02115. REPLIGEN CORP,CAMBRIDGE,MA 02139. USN,MED RES INST,IMMUNE CELL BIOL PROGRAM,BETHESDA,MD 20889. FU NCI NIH HHS [CA 54521] NR 51 TC 222 Z9 232 U1 0 U2 5 PU AMER ASSOC IMMUNOLOGISTS PI BETHESDA PA 9650 ROCKVILLE PIKE, BETHESDA, MD 20814 SN 0022-1767 J9 J IMMUNOL JI J. Immunol. PD OCT 1 PY 1993 VL 151 IS 7 BP 3489 EP 3499 PG 11 WC Immunology SC Immunology GA LZ636 UT WOS:A1993LZ63600009 PM 8397258 ER PT J AU WEINSTEIN, SL JUNE, CH DEFRANCO, AL AF WEINSTEIN, SL JUNE, CH DEFRANCO, AL TI LIPOPOLYSACCHARIDE-INDUCED PROTEIN-TYROSINE PHOSPHORYLATION IN HUMAN MACROPHAGES IS MEDIATED BY CD14 SO JOURNAL OF IMMUNOLOGY LA English DT Article ID LPS BINDING-PROTEIN; CELL-LINE THP-1; BLOOD MONOCYTES; BACTERIAL LIPOPOLYSACCHARIDES; MEMBRANE MOLECULES; CROSS-LINKING; HERBIMYCIN-A; 70Z/3 CELLS; ACTIVATION; RECEPTOR AB Induced protein tyrosine phosphorylation is an early intracellular event in LPS-stimulated murine macrophages that appears to play a role in signal transduction. We have now demonstrated that LPS also increases protein tyrosine phosphorylation in human monocyte-derived macrophages and in the human monocytic cell line, THP-1. This response was rapidly elicited by biologically active forms of LPS or lipid A, at concentrations of these bacterial components that stimulate anti-bacterial responses by human macrophages. Inhibition of the LPS-induced tyrosine phosphorylation response with the tyrosine kinase inhibitor, herbimycin A, was accompanied by the inhibition of the secretion of TNF-alpha by human macrophages. These results extend previous work with murine macrophages and provide further support for the hypothesis that induced protein tyrosine phosphorylation is an important signaling reaction in macrophages after LPS exposure. In addition, CD14, which is thought to be a receptor for LPS, appeared to mediate the induced phosphorylation response in human macrophages and THP-1 cells at low LPS concentrations. Two antibodies against CD14, 3C10 and 60b, which have been shown to prevent LPS binding to CD14, specifically inhibited the protein tyrosine phosphorylation induced by nanogram per milliliter concentrations of LPS in these cells. The antibody-mediated inhibition did not appear to involve engagement of surface FcR because a preparation of F(ab')2/Fab fragments of the 60b antibody also prevented LPS-induced tyrosine phosphorylation. At higher concentrations of LPS (greater-than-or-equal-to 10 ng/ml), however, anti-CD14 antibodies did not prevent the induction of protein tyrosine phosphorylation, suggesting that a lower affinity CD14-independent pathway also mediates the tyrosine phosphorylation response. Because CD14-dependent and CD14-independent recognition of LPS appear to lead to the same functional responses by macrophages, induced protein tyrosine phosphorylation may be part of a shared intracellular signaling pathway. C1 UNIV CALIF SAN FRANCISCO,DEPT MICROBIOL & IMMUNOL,GEORGE W HOOPER FDN,SAN FRANCISCO,CA 94143. UNIV CALIF SAN FRANCISCO,DEPT PHYSIOL,SAN FRANCISCO,CA 94143. USN,MED RES INST,IMMUNE CELL BIOL PROGRAM,BETHESDA,MD 20889. FU NIAID NIH HHS [AI20038] NR 51 TC 193 Z9 193 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 OCT 1 PY 1993 VL 151 IS 7 BP 3829 EP 3838 PG 10 WC Immunology SC Immunology GA LZ636 UT WOS:A1993LZ63600043 PM 7690817 ER PT J AU EDELMAN, R HOFFMAN, SL DAVIS, JR BEIER, M SZTEIN, MB LOSONSKY, G HERRINGTON, DA EDDY, HA HOLLINGDALE, MR GORDON, DM CLYDE, DF AF EDELMAN, R HOFFMAN, SL DAVIS, JR BEIER, M SZTEIN, MB LOSONSKY, G HERRINGTON, DA EDDY, HA HOLLINGDALE, MR GORDON, DM CLYDE, DF TI LONG-TERM PERSISTENCE OF STERILE IMMUNITY IN A VOLUNTEER IMMUNIZED WITH X-IRRADIATED PLASMODIUM-FALCIPARUM SPOROZOITES SO JOURNAL OF INFECTIOUS DISEASES LA English DT Note ID ATTENUATED SPOROZOITES; MALARIA SPOROZOITES; T-CELLS; IMMUNOGENICITY; VACCINE; PROTEIN; SAFETY; ANTIBODIES; EFFICACY; HUMANS AB Three volunteers were immunized by repeated exposure to the bites of Plasmodium falciparum-infected, X-irradiated mosquitoes to characterize immunologic responses and duration of protective immunity. A primary series of immunizations had been shown previously to induce sterile immunity in these volunteers against sporozoite-induced P. falciparum malaria. In the current study, antibodies to sporozoites circulated at high levels for at least 9-12 months after the volunteers were administered booster bites from X-irradiated infective mosquitoes. One volunteer challenged a second time with P. falciparum 9 months after his last immunization was again shown to be protected, whereas all 5 control subjects developed patent infections. These results set a new standard for persistence of sterile immunity against experimental P. falciparum infection. C1 UNIV MARYLAND,SCH MED,DEPT MED,DIV GEOG MED,BALTIMORE,MD 21201. UNIV MARYLAND,SCH MED,DEPT PEDIAT,DIV INFECT DIS & TROP PEDIAT,BALTIMORE,MD 21201. UNIV MARYLAND,SCH MED,DEPT RADIAT ONCOL,BALTIMORE,MD 21201. USN,MED RES INST,DEPT DEF,MALARIA VACCINE PROGRAM,BETHESDA,MD 20814. WALTER REED ARMY INST RES,DEPT DEF,MALARIA VACCINE PROGRAM,WASHINGTON,DC 20307. BIOMED RES INST,ROCKVILLE,MD. RP EDELMAN, R (reprint author), UNIV MARYLAND,SCH MED,CTR VACCINE DEV,10 S PINE ST,ROOM 9-34,BALTIMORE,MD 21201, USA. FU NIAID NIH HHS [AI-62553] NR 15 TC 62 Z9 62 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 OCT PY 1993 VL 168 IS 4 BP 1066 EP 1070 PG 5 WC Immunology; Infectious Diseases; Microbiology SC Immunology; Infectious Diseases; Microbiology GA LY582 UT WOS:A1993LY58200044 PM 8376823 ER PT J AU RICHARDS, AL MALONE, JD SHERIS, S WEDDLE, JR ROSSI, CA KSIAZEK, TG LEDUC, JW DASCH, GA HYAMS, KC AF RICHARDS, AL MALONE, JD SHERIS, S WEDDLE, JR ROSSI, CA KSIAZEK, TG LEDUC, JW DASCH, GA HYAMS, KC TI ARBOVIRUS AND RICKETTSIAL INFECTIONS AMONG COMBAT TROOPS DURING OPERATION DESERT SHIELD DESERT-STORM SO JOURNAL OF INFECTIOUS DISEASES LA English DT Letter ID TYPHUS C1 USN,INFECT DIS THREAT ASSESSMENT PROGRAM,BETHESDA,MD 20814. USN,DEPT INTERNAL MED,DIV INFECT DIS,VIRAL & RICKETTSIAL DIS PROGRAM,BETHESDA,MD 20814. USA,INFECT DIS RES INST,DIV DIS ASSESSMENT,FREDERICK,MD 21701. NR 9 TC 18 Z9 18 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 OCT PY 1993 VL 168 IS 4 BP 1080 EP 1081 PG 2 WC Immunology; Infectious Diseases; Microbiology SC Immunology; Infectious Diseases; Microbiology GA LY582 UT WOS:A1993LY58200053 PM 8376827 ER PT J AU IDZERDA, YU GUTIERREZ, CJ TJENG, LH LIN, HJ MEIGS, G CHEN, CT AF IDZERDA, YU GUTIERREZ, CJ TJENG, LH LIN, HJ MEIGS, G CHEN, CT TI MAGNETIC CIRCULAR-DICHROISM OF FEXCO1-X SINGLE-CRYSTAL THIN-FILMS SO JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS LA English DT Article ID FE-CO ALLOYS; ELECTRONIC-STRUCTURE; DISORDERED ALLOYS; ULTRATHIN FILMS; SPIN; NICKEL; IRON AB Soft X-ray magnetic circular dichroism (SXMCD) of the L2 and L3 edges of Fe and Co is used to independently determine magnetic information for single-crystal FexCo1-x alloy thin films (0 less-than-or-equal-to x less-than-or-equal-to 1) grown on ZnSe(001). The SXMCD L3 to L2 relative intensity of the Fe-Co alloy sytem is found to rise monotonically with reducing atomic concentration for both the Co and Fe, indicating an increase in the orbital to spin moment contribution at the dilute limits. This suggests that the orbital moment may play a significant role in the magnetism of transition metal alloy systems. C1 AT&T BELL LABS,MURRAY HILL,NJ 07974. SW TEXAS STATE UNIV,DEPT PHYS,SAN MARCOS,TX 78666. RP IDZERDA, YU (reprint author), USN,RES LAB,CODE 6345,WASHINGTON,DC 20375, USA. NR 30 TC 18 Z9 18 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 OCT PY 1993 VL 127 IS 1-2 BP 109 EP 114 DI 10.1016/0304-8853(93)90203-E PG 6 WC Materials Science, Multidisciplinary; Physics, Condensed Matter SC Materials Science; Physics GA ME926 UT WOS:A1993ME92600018 ER PT J AU MILANO, J MAUK, SD FLITTER, L MORRIS, R AF MILANO, J MAUK, SD FLITTER, L MORRIS, R TI AN INTELLIGENT APPROACH TO WELDING ROBOT SELECTION SO JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE LA English DT Article; Proceedings Paper CT INTERNATIONAL AEROMAT 93 CONF : PROCESSING/SYNTHESIS OF MATERIALS CY JUN 06-09, 1993 CL ANAHEIM, CA SP AMER SOC MET INT DE HOPFIELD NETWORKS; NEURAL NETWORKS; OPTIMIZATION; PATH PLANNING; ROBOT; WELDING AB In a shipyard where multiple stationary and mobile workcells are employed in the fabrication of components of complex sub-assemblies, efficient operation requires an intelligent method of scheduling jobs and selecting workcells based on optimum throughput and cost. The achievement of this global solution requires the successful organization of resource availability, process requirements, and process constraints. The Off-line Planner (OLP) of the Programmable Automated Weld System (PAWS) is capable of advanced modeling of weld processes and environments as well as the generation of complete weld procedures. These capabilities involve the integration of advanced Computer Aided Design (CAD), path planning, and obstacle detection and avoidance techniques as well as the synthesis of complex design and process information. These existing capabilities provide the basis of the functionality required for the successful implementation of an intelligent weld robot selector and material flow planner. Current efforts are focused on robot selection via the dynamic routing of components to the appropriate work cells. It is proposed that this problem is a variant of the ''Traveling Salesman Problem'' (TSP) that has been proven to belong to a larger set of optimization problems termed nondeterministic polynomial complete (NP complete). In this paper, a heuristic approach utilizing recurrent neural networks is explored as a rapid means of producing a near optimal, if not optimal, weld robot selection. C1 SDM CONSULTING INC,UPPER MARLBORO,MD 20772. RP MILANO, J (reprint author), USN,CTR SURFACE WARFARE,CARDEROCK DIV,CODE 2033,BETHESDA,MD 20084, USA. NR 9 TC 0 Z9 0 U1 1 U2 1 PU ASM INTERNATIONAL PI MATERIALS PARK PA SUBSCRIPTIONS SPECIALIST CUSTOMER SERVICE, MATERIALS PARK, OH 44073-0002 SN 1059-9495 J9 J MATER ENG PERFORM JI J. Mater. Eng. Perform. PD OCT PY 1993 VL 2 IS 5 BP 683 EP 686 DI 10.1007/BF02650057 PG 4 WC Materials Science, Multidisciplinary SC Materials Science GA MH538 UT WOS:A1993MH53800007 ER PT J AU PAYNE, RD REBIS, RE MORAN, AL AF PAYNE, RD REBIS, RE MORAN, AL TI SPRAY FORMING QUALITY PREDICTIONS VIA NEURAL NETWORKS SO JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE LA English DT Article; Proceedings Paper CT INTERNATIONAL AEROMAT 93 CONF : PROCESSING/SYNTHESIS OF MATERIALS CY JUN 06-09, 1993 CL ANAHEIM, CA SP AMER SOC MET INT DE NEAR-NET SHAPE MANUFACTURING; NEURAL NETWORK APPLICATIONS; SPRAY FORMING TECHNOLOGY AB To produce consistently high-quality spray-formed parts, correlations must be made between the input process parameters and the final part quality. The Spray Forming Technology Group at the Naval Surface Warfare Center decided to ''model'' this correlation through the use of artificial neural networks. In this study, neural networks accurately predicted trends in spray forming process outputs based on variations in process inputs. The graphs generated by the neural network prediction help to define the optimal operating region for the spray forming process and indicate the effect of changing input process parameters on final part quality. C1 JOHNS HOPKINS UNIV,DEPT MAT SCI & ENGN,BALTIMORE,MD 21218. USN ACAD,DEPT MECH ENGN,ANNAPOLIS,MD 21401. RP PAYNE, RD (reprint author), USN,CTR SURFACE WARFARE,CARDEROCK DIV,ANNAPOLIS DETACHMENT,ANNAPOLIS,MD 21401, USA. NR 9 TC 5 Z9 8 U1 0 U2 0 PU ASM INTERNATIONAL PI MATERIALS PARK PA SUBSCRIPTIONS SPECIALIST CUSTOMER SERVICE, MATERIALS PARK, OH 44073-0002 SN 1059-9495 J9 J MATER ENG PERFORM JI J. Mater. Eng. Perform. PD OCT PY 1993 VL 2 IS 5 BP 693 EP 702 DI 10.1007/BF02650059 PG 10 WC Materials Science, Multidisciplinary SC Materials Science GA MH538 UT WOS:A1993MH53800009 ER PT J AU PEHRSSON, PE RAMAKER, D AF PEHRSSON, PE RAMAKER, D TI CHEMISTRY AND LOCALIZATION EFFECTS IN THE C-KVV AUGER LINE-SHAPES OF TRANSITION-METAL CARBIDES AND RELATED-COMPOUNDS SO JOURNAL OF MATERIALS RESEARCH LA English DT Article ID NARROW-BAND METALS; ELECTRONIC-STRUCTURE; TANTALUM CARBIDE; SPECTRA; SPECTROSCOPY; DIAMOND; STATES; LINESHAPES; SURFACE; GRAPHITE AB The C-KLL Auger line shapes of the transition metal carbides and some related compounds are examined as a function of the metal and nonmetalloid components (C, N, and O). They are discussed in the context of hole-hole repulsion and screening effects. The effect of pi versus sigma-bonding and the proportion of ionic versus covalent bonding are correlated with various aspects of the X-CVV Auger line shape, such as relative peak shifts, intensity of a high energy shoulder, and the multiplet splitting of the sp component. RP USN, RES LAB, DIV CHEM, WASHINGTON, DC 20375 USA. NR 48 TC 5 Z9 5 U1 0 U2 3 PU CAMBRIDGE UNIV PRESS PI NEW YORK PA 32 AVENUE OF THE AMERICAS, NEW YORK, NY 10013-2473 USA SN 0884-2914 EI 2044-5326 J9 J MATER RES JI J. Mater. Res. PD OCT PY 1993 VL 8 IS 10 BP 2716 EP 2724 DI 10.1557/JMR.1993.2716 PG 9 WC Materials Science, Multidisciplinary SC Materials Science GA LZ661 UT WOS:A1993LZ66100036 ER PT J AU GEIVELIS, M TURNER, DW PEDERSON, ED LAMBERTS, BL AF GEIVELIS, M TURNER, DW PEDERSON, ED LAMBERTS, BL TI MEASUREMENTS OF INTERLEUKIN-6 IN GINGIVAL CREVICULAR FLUID FROM ADULTS WITH DESTRUCTIVE PERIODONTAL-DISEASE SO JOURNAL OF PERIODONTOLOGY LA English DT Article DE PERIODONTAL DISEASES/DIAGNOSIS; GINGIVAL CREVICULAR FLUID/DIAGNOSTIC USE; INTERLEUKIN-6/DIAGNOSTIC USE ID IMMUNE-COMPLEXES; GROWTH; SYSTEM; BONE AB THIS PAPER DESCRIBES A STUDY Of whether or not the amounts of interleukin-6 (IL-6) in gingival crevicular fluid (GCF) are correlated with periodontal clinical measures. A sensitive ELISA was developed to measure IL-6 in GCF. Two male and 3 female adult subjects with periodontal disease were examined at their first appointments, after 3 months, and after 6 months. Data were obtained on plaque index (PI), bleeding index (BI), probing depth (PD), and on the IL-6 content of GCF samples from 16 sites per subject for a total of 240 measurements. Significant correlations were found between BI and IL-6 (P <0.005) and between PD and IL-6 (P <0.05), but not between PI and IL-6. Only 6 out of the 80 sites (in 3 of the 5 subjects) showed PD increases of at least 2 mm. However, for each of these 3 subjects, the amounts of IL-6 in the GCF samples from these sites were markedly higher than the mean amounts of IL-6 in the GCF samples from the remaining sites. These findings suggest that IL-6 may be a useful indicator of periodontal disease, although more extensive longitudinal studies are needed to determine the real clinical value of this GCF component. C1 USN,MED RES & DEV COMMAND,DENT RES INST,CTR TRAINING,GREAT LAKES,IL 60088. NORTHWESTERN UNIV,SCH DENT,DIV PERIODONT,CHICAGO,IL 60611. NR 16 TC 121 Z9 140 U1 0 U2 4 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 OCT PY 1993 VL 64 IS 10 BP 980 EP 983 PG 4 WC Dentistry, Oral Surgery & Medicine SC Dentistry, Oral Surgery & Medicine GA MH997 UT WOS:A1993MH99700010 PM 8277408 ER PT J AU PICKETT, WE AF PICKETT, WE TI CLUES TO THE FUNDAMENTAL PROPERTIES OF HIGH-TEMPERATURE SUPERCONDUCTORS SO JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS LA English DT Article; Proceedings Paper CT Conference on Spectroscopies in Novel Superconductors CY MAR 17-19, 1993 CL SANTA FE, NM SP LOS ALAMOS NATL LAB, ARGONNE NATL LAB DE HIGH TEMPERATURE SUPERCONDUCTIVITY; METALS; FERMI SURFACE; TRANSPORT PROPERTIES; OPTICAL PROPERTIES ID HIGH-TC SUPERCONDUCTIVITY; NORMAL-STATE; TRANSPORT-PROPERTIES; SINGLE-CRYSTAL; BAND-STRUCTURE; FERMI-SURFACE; HALL ANGLE; YBA2CU3O7; MODEL; LA2-XBAXCUO4 AB Are there properties of high temperature superconductors, or specific phenomena in some of them, that constitute ''smoking guns'' - signals that dearly guide us toward the appropriate picture, or at least rule out some possibilities? Possible pn racks include: phase diagram, transport properties, magnetic phenomena, optical characteristics, and superconducting properties. An example of the difficulty in identifying smoking guns is the verification and mapping out of the Fermi surface of YBa2Cu3O7: it is a veritable smoking assault rifle that has narrowed speculation considerably, yet there are still arguments that the normal state of the high T(c) phase is not a conventional Fermi liquid. This Fermi liquid question has been discussed sufficiently in the literature; here I briefly discuss a few other recently emphasized phenomena as possible smoking guns. RP PICKETT, WE (reprint author), USN,RES LAB,COMPLEX SYST THEORY BRANCH,CODE 6604,WASHINGTON,DC 20375, USA. NR 46 TC 2 Z9 2 U1 0 U2 1 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0022-3697 J9 J PHYS CHEM SOLIDS JI J. Phys. Chem. Solids PD OCT PY 1993 VL 54 IS 10 BP 1115 EP 1122 DI 10.1016/0022-3697(93)90152-H PG 8 WC Chemistry, Multidisciplinary; Physics, Condensed Matter SC Chemistry; Physics GA MN594 UT WOS:A1993MN59400009 ER PT J AU HAANAPPEL, EG JOSS, W WYDER, P ASKENAZY, S MUELLER, FM TRUBENBACH, K MATTAUSCH, H SIMON, A OSOFSKY, M AF HAANAPPEL, EG JOSS, W WYDER, P ASKENAZY, S MUELLER, FM TRUBENBACH, K MATTAUSCH, H SIMON, A OSOFSKY, M TI THE DE-HAAS-VAN-ALPHEN EFFECT IN YBA2CU3O7-DELTA SO JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS LA English DT Article; Proceedings Paper CT Conference on Spectroscopies in Novel Superconductors CY MAR 17-19, 1993 CL SANTA FE, NM SP LOS ALAMOS NATL LAB, ARGONNE NATL LAB ID MAGNETIC-FIELDS; FERMI-SURFACE; YBA2CU3O6.97 C1 MAX PLANCK INST FESTKORPERFORSCH,HOCHFELD MAGNETLAB,BP 166,F-38042 GRENOBLE 9,FRANCE. COMPLEXE SCI RANGUEIL,SERV CHAMPS MAGNET PULSES,F-31077 TOULOUSE,FRANCE. LOS ALAMOS NATL LAB,CTR MAT SCI,LOS ALAMOS,NM 87545. MAX PLANCK INST FESTKORPERFORSCH,W-7000 STUTTGART,GERMANY. USN,RES LAB,WASHINGTON,DC 20375. NR 20 TC 14 Z9 14 U1 0 U2 1 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0022-3697 J9 J PHYS CHEM SOLIDS JI J. Phys. Chem. Solids PD OCT PY 1993 VL 54 IS 10 BP 1261 EP 1267 DI 10.1016/0022-3697(93)90178-T PG 7 WC Chemistry, Multidisciplinary; Physics, Condensed Matter SC Chemistry; Physics GA MN594 UT WOS:A1993MN59400035 ER PT J AU RYAN, JC RAJAGOPAL, AK AF RYAN, JC RAJAGOPAL, AK TI MANIFESTATIONS OF THE LANDAU QUANTIZATION IN TYPE-II SUPERCONDUCTORS IN HIGH MAGNETIC-FIELDS SO JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS LA English DT Article; Proceedings Paper CT Conference on Spectroscopies in Novel Superconductors CY MAR 17-19, 1993 CL SANTA FE, NM SP LOS ALAMOS NATL LAB, ARGONNE NATL LAB DE LANDAU QUANTIZATION; TYPE-II SUPERCONDUCTOR; VORTEX LATTICE ID VANALPHEN AB A brief discussion of the Landau - level states, the structure of the gap function, and the lattice periodic solutions of the Gorkov equations is given in the context of type II superconductivity in the presence of high magnetic fields. RP RYAN, JC (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 9 TC 0 Z9 0 U1 0 U2 0 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0022-3697 J9 J PHYS CHEM SOLIDS JI J. Phys. Chem. Solids PD OCT PY 1993 VL 54 IS 10 BP 1281 EP 1282 DI 10.1016/0022-3697(93)90180-Y PG 2 WC Chemistry, Multidisciplinary; Physics, Condensed Matter SC Chemistry; Physics GA MN594 UT WOS:A1993MN59400037 ER PT J AU ROBINSON, S BURFISHER, ME HINOJOSAOJEDA, R THIERFELDER, KE AF ROBINSON, S BURFISHER, ME HINOJOSAOJEDA, R THIERFELDER, KE TI AGRICULTURAL POLICIES AND MIGRATION IN A UNITED-STATES-MEXICO FREE-TRADE AREA - A COMPUTABLE GENERAL EQUILIBRIUM-ANALYSIS SO JOURNAL OF POLICY MODELING LA English DT Article; Proceedings Paper CT 5TH TASK FORCE MEETING ON APPLIED GENERAL EQUILIBRIUM MODELING CY AUG, 1991 CL INT INST APPL SYST ANAL, LAXENBURG, AUSTRIA HO INT INST APPL SYST ANAL ID MODELS AB A United States-Mexico agreement to form a free trade area (FTA) is analyzed using an 11-sector, three-country, computable general equilibrium model that explicitly models farm programs and labor migration. The model incorporates both rural-urban migration within Mexico and international migration between Mexico and the United States. In the model, sectoral import demands are specified with a flexible functional form, an empirical improvement over earlier specifications, which use a constant elasticity of substitution function. Using the model, we identify trade-offs among bilateral trade growth, labor migration, and agricultural program expenditures under alternative FTA scenarios. Trade liberalization in agriculture greatly increases rural-urban migration within Mexico and migration from Mexico to the United States. Migration is reduced if Mexico grows relative to the United States and also if Mexico retains farm support programs. However, the more support that is provided to the Mexican agricultural sector, the smaller is bilateral trade growth. The results indicate a policy trade-off between rapidly achieving gains from trade liberalization and providing a transition period long enough to assimilate displaced labor in Mexico without undue strain. C1 UNIV CALIF LOS ANGELES,LOS ANGELES,CA 90024. USN ACAD,ANNAPOLIS,MD 21402. USDA,WASHINGTON,DC 20250. RP ROBINSON, S (reprint author), UNIV CALIF BERKELEY,DEPT AGR & RESOURCE ECON,BERKELEY,CA 94720, USA. NR 37 TC 17 Z9 17 U1 1 U2 3 PU ELSEVIER SCIENCE INC PI NEW YORK PA 655 AVENUE OF THE AMERICAS, NEW YORK, NY 10010 SN 0161-8938 J9 J POLICY MODEL JI J. Policy Model. PD OCT-DEC PY 1993 VL 15 IS 5-6 BP 673 EP 701 DI 10.1016/0161-8938(93)90009-F PG 29 WC Economics SC Business & Economics GA LZ733 UT WOS:A1993LZ73300009 ER PT J AU CURTIS, SR AF CURTIS, SR TI INTEGRATING FIXED AND REMOVABLE PROVISIONAL RESTORATIONS SO JOURNAL OF PROSTHETIC DENTISTRY LA English DT Article AB When both fixed and removable components are required, provisional restorations can be difficult. This article describes a technique where provisional restoration ''shells'' are made with a plastic stent of the diagnostic wax-up on lightly prepared teeth of a diagnostic cast. An acrylic removable partial denture is then waxed to the shells. The shells are relined intraorally after tooth preparation with the partial denture in place. C1 USN,NATL NAVAL DENT SCH,BETHESDA,MD 20814. NR 1 TC 1 Z9 1 U1 0 U2 2 PU MOSBY-YEAR BOOK INC PI ST LOUIS PA 11830 WESTLINE INDUSTRIAL DR, ST LOUIS, MO 63146-3318 SN 0022-3913 J9 J PROSTHET DENT JI J. Prosthet. Dent. PD OCT PY 1993 VL 70 IS 4 BP 374 EP 377 DI 10.1016/0022-3913(93)90225-D PG 4 WC Dentistry, Oral Surgery & Medicine SC Dentistry, Oral Surgery & Medicine GA LZ653 UT WOS:A1993LZ65300019 PM 8229892 ER PT J AU GUHA, S PEEBLES, D BROWNING, V WIETING, T CHANDLERHOROWITZ, D NORTON, M AF GUHA, S PEEBLES, D BROWNING, V WIETING, T CHANDLERHOROWITZ, D NORTON, M TI OPTICAL CONDUCTIVITY OF SINGLE-CRYSTALS OF BA(1-X)M(X)BIO(3) (M=K, RB, X=0.04, 0.37) SO JOURNAL OF SUPERCONDUCTIVITY LA English DT Article DE INFRARED REFLECTIVITY; BISMUTHATE; OPTICAL CONDUCTIVITY; OPTICAL PHONONS; POLARONS ID BA1-XKXBIO3 SYSTEM; ENERGY-GAP; SUPERCONDUCTIVITY; BA0.6K0.4BIO3; BAPB1-XBIXO3; STATE; BAXK1-XBIO3 AB Reflectance data (0.001-4.0 eV) from several large (a typical surface area 3 x 3 mm(2)) single crystals of Ba1-xKxBiO3 (x = 0.04, 0.37) (BKBO) and Ba1-xRbxBiO3 (x = 0.37) (BRBO) were obtained by Fourier transform infrared (FTIR) and ellipsometric methods. Normal-state optical conductivities (sigma(1)) of these samples were obtained from infrared and ellipsometric measurements using a Kramers-Kronig transform. A broad mid-IR band was observed that peaked at 0.3 eV for BKBO and at 0.16 eV for BRBO at room temperature. Each band was fitted with two Lorentz oscillators. The optical mass of the charge carriers was obtained from a Drude fit, and was found to be large (m* = 28-33m(e)). These overdamped charge carriers can be viewed as polarons with a large effective mass. An optic phonon mode at 325 cm(-1) was also observed in the metallic phase. This mode was identified as a disorder-induced lattice mode, and was strongly enhanced at 8 K, favoring a strong coupling between this phonon and itinerant electronic states. Low-frequency spectra between 10 and 400 cm(-1) observed below the superconducting temperature indicated an energy gap that agreed with the BCS-type mechanism. Interpretations of low-temperature measurements on BKBO and BRBO were complicated due to the change of color of the sample from bluish-green to bronze-red. Upon warming, samples revert to their original bluish-green color. C1 NIST,DIV SEMICOND ELECTR,GAITHERSBURG,MD 20899. MARSHALL UNIV,DEPT CHEM,HUNTINGTON,WV 25701. RP GUHA, S (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 34 TC 1 Z9 1 U1 0 U2 1 PU PLENUM PUBL CORP PI NEW YORK PA 233 SPRING ST, NEW YORK, NY 10013 SN 0896-1107 J9 J SUPERCOND JI J. Supercond. PD OCT PY 1993 VL 6 IS 5 BP 339 EP 349 DI 10.1007/BF00617482 PG 11 WC Physics, Applied; Physics, Condensed Matter SC Physics GA MP884 UT WOS:A1993MP88400009 ER PT J AU PFLUG, LA IOUP, GE IOUP, JW AF PFLUG, LA IOUP, GE IOUP, JW TI SAMPLING REQUIREMENTS AND ALIASING FOR HIGHER-ORDER CORRELATIONS SO JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA LA English DT Article ID DETERMINISTIC TRANSIENTS; BISPECTRUM; SPECTRA; NOISE; SIGNALS; PHASE AB While sampling at a Nyquist frequency equal to the highest frequency present in the data (critical sampling) is sufficient to prevent aliasing in both the data and the autocorrelation of a bandlimited energy signal, the sampling requirements for the avoidance of aliasing in higher-order correlations and spectra are not the same. Also, there is a difference in aliasing effects depending on whether one samples the original continuous-time signal and calculates the autocorrelation or one samples the continuous-time autocorrelation. This distinction between sampling procedures must be made for correlations of higher order, as well, for which not only the type of aliasing but also the sampling requirements to prevent aliasing differ. In particular, if one samples the continuous-time autobicorrelation or autotricorrelation, critical sampling is sufficient to prevent aliasing. In practice, however, it is not usually the continuous-time autobicorrelation or autotricorrelation that is sampled. Generally, it is the original continuous-time signal that is sampled and used to calculate the discrete-time autobicorrelation or autotricorrelation. In this case, to prevent aliasing, the sampling interval for the autobicorrelation must be no greater than two-thirds the interval associated with critical sampling, and no greater than one-half for the autotricorrelation. Numerical calculations of autocorrelation, autobicorrelation, and autotricorrelation zero-lag values corresponding to spectral area and volume as well as bispectral contour plots for two model bandlimited energy signals are presented as demonstrations of these conclusions. Sampling requirements for higher-order correlations of rectified signals are also discussed. If the signal is to be rectified for use in a correlation detector or time delay estimator, then the sampling rate must increase to accommodate the higher frequencies that usually result from the process of rectification. Spectral masking filters, which remove aliasing in higher-order correlations, are defined and a bispectral filter is applied to some representative energy signals. Lag domain convolution filters for the removal of aliasing in the bicorrelation and tricorrelation are also given. These filters assume critical sampling or finer for the original signal to remove aliasing effects totally. C1 UNIV NEW ORLEANS,DEPT PHYS,NEW ORLEANS,LA 70148. RP PFLUG, LA (reprint author), USN,RES LAB,BAY ST LOUIS,MS 39529, USA. NR 35 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 0001-4966 J9 J ACOUST SOC AM JI J. Acoust. Soc. Am. PD OCT PY 1993 VL 94 IS 4 BP 2159 EP 2172 DI 10.1121/1.407487 PG 14 WC Acoustics; Audiology & Speech-Language Pathology SC Acoustics; Audiology & Speech-Language Pathology GA MB552 UT WOS:A1993MB55200023 ER PT J AU OLSON, AH SUTTON, SP AF OLSON, AH SUTTON, SP TI THE PHYSICAL-MECHANISMS LEADING TO ELECTRICAL BREAKDOWN IN UNDERWATER ARC SOUND SOURCES SO JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA LA English DT Article AB Underwater electrical arcs have long been used as an impulsive sound source, although efforts to improve efficiency and control acoustic output have been limited by inadequate understanding of the arc initiation process. An experimental study of electrical breakdown in seawater is presented and a model for arc initiation is proposed. It is shown that breakdown is not driven by the achievement of a critical electric field strength, but is an energy-dependent process. Provided the field is applied for a sufficiently long time, breakdown is demonstrated to occur at very low field strength. The breakdown time is shown to be linearly correlated with the time at which a threshold vaporization energy is dissipated in the fluid. This threshold energy is determined acoustically, by measuring the minimum electrical pulse energy required to observe steam bubble formation and collapse. These observations are used to support a model for breakdown in seawater based on vaporization as the initiating mechanism. The model is shown to be consistent with experiments up to field strengths of 50 kV/cm. RP OLSON, AH (reprint author), USN,CTR COMMAND CONTROL & OCEAN SURVEILLANCE,SAN DIEGO,CA 92152, USA. NR 21 TC 18 Z9 19 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 OCT PY 1993 VL 94 IS 4 BP 2226 EP 2231 DI 10.1121/1.407493 PG 6 WC Acoustics; Audiology & Speech-Language Pathology SC Acoustics; Audiology & Speech-Language Pathology GA MB552 UT WOS:A1993MB55200029 ER PT J AU LOVE, RH AF LOVE, RH TI A COMPARISON OF VOLUME SCATTERING STRENGTH DATA WITH MODEL-CALCULATIONS BASED ON QUASISYNOPTICALLY COLLECTED FISHERY DATA SO JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA LA English DT Article ID TARGET STRENGTH; SWIMBLADDER AB Volume reverberation measurements were made between 800 and 5000 Hz in the Norwegian Sea in August 1988 and west of Great Britain in April 1989. Coincidentally, extensive fishery surveys were conducted at about the same time near the two experimental areas. A comparison of acoustic results with model calculations based on the fishery data provided the means to determine if volume reverberation can be reliably predicted from high-quality biological information. Good correlation between acoustic data and model results was obtained after several plausible modifications were made to the fishery information. Results indicate that blue whiting are the major scatterers off Great Britain and that both blue whiting and redfish are important scatterers in the Norwegian Sea. Before this study, blue whiting were expected to dominate in both areas and redfish had been assumed to be unimportant. The study shows that volume scattering strengths can be accurately predicted if the characteristics of the scatterers are well known. RP LOVE, RH (reprint author), USN,RES LAB,BAY ST LOUIS,MS 39529, USA. NR 23 TC 26 Z9 26 U1 1 U2 2 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0001-4966 J9 J ACOUST SOC AM JI J. Acoust. Soc. Am. PD OCT PY 1993 VL 94 IS 4 BP 2255 EP 2268 DI 10.1121/1.407497 PG 14 WC Acoustics; Audiology & Speech-Language Pathology SC Acoustics; Audiology & Speech-Language Pathology GA MB552 UT WOS:A1993MB55200033 ER PT J AU COLLINS, MD AF COLLINS, MD TI THE ADIABATIC MODE PARABOLIC EQUATION SO JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA LA English DT Article ID WAVE-EQUATION; OCEAN ACOUSTICS; PROPAGATION; APPROXIMATION; COMPUTATION; BOTTOM AB An efficient method is developed for solving problems involving three-dimensional acoustic propagation in a thin spherical shell. The method is based on the adiabatic mode approximation, which assumes that energy coupling between modes is negligible, and the parabolic equation (PE) method, which efficiently handles spatial variations in the acoustic properties. The PE method is used to solve two-dimensional wave equations for the adiabatic mode coefficients over latitude and longitude. Due to this reduction in dimension, the adiabatic mode PE should be practical for solving global-scale ocean acoustics problems. These types of problems, which are currently of great interest [Heaney et al., J. Acoust. Soc. Am. 90, 2586-2594 (1991); Baggeroer and Munk, Phys. Today 45(9), 22-30 (1992)], are too large to solve with other existing three-dimensional models. RP COLLINS, MD (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 34 TC 49 Z9 51 U1 1 U2 2 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0001-4966 J9 J ACOUST SOC AM JI J. Acoust. Soc. Am. PD OCT PY 1993 VL 94 IS 4 BP 2269 EP 2278 DI 10.1121/1.407498 PG 10 WC Acoustics; Audiology & Speech-Language Pathology SC Acoustics; Audiology & Speech-Language Pathology GA MB552 UT WOS:A1993MB55200034 ER PT J AU WILD, M JOYCE, R AF WILD, M JOYCE, R TI 3-DIMENSIONAL MODELING OF NARROW-BAND PULSE SPREADING USING NORMAL-MODES SO JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA LA English DT Article AB Energy from a narrow-band pulse, interacting with a time-varying ocean surface, will be spread into upper and lower sidebands. This can be modeled in a range-independent ocean environment, using normal modes and a coupling scheme based on first-order perturbation theory. The structure of the scattered signal from the two-dimensional Pierson-Moskowitz surface wave spectrum is presented. A normal-mode model with environmental inputs from a shallow sea has been used, and a comparison is made with measured data. C1 UNIV SO MISSISSIPPI,PROGRAM SCI COMP,HATTIESBURG,MS 39406. RP WILD, M (reprint author), USN,OCEANOG OFF,BAY ST LOUIS,MS 39522, USA. NR 11 TC 2 Z9 2 U1 0 U2 0 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0001-4966 J9 J ACOUST SOC AM JI J. Acoust. Soc. Am. PD OCT PY 1993 VL 94 IS 4 BP 2303 EP 2306 DI 10.1121/1.407471 PG 4 WC Acoustics; Audiology & Speech-Language Pathology SC Acoustics; Audiology & Speech-Language Pathology GA MB552 UT WOS:A1993MB55200038 ER PT J AU SMITH, JF FINETTE, S AF SMITH, JF FINETTE, S TI SIMULATED ANNEALING AS A METHOD OF DECONVOLUTION FOR ACOUSTIC TRANSIENTS MEASURED ON A VERTICAL ARRAY SO JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA LA English DT Article ID INVERSION; OPTIMIZATION AB The temporal signature of an acoustic pulse propagating in an ocean waveguide is estimated from passively sensed multichannel data. A general formalism is provided for source signature extraction using a parallel deconvolution algorithm based on simulated annealing. The approach is tested on two sets of experimental data using a broadband signal (25-110 Hz) recorded on a vertical array located at distances of one and two convergence zones from the source. As a demonstration of the computational feasibility of this method, the algorithm is shown to be capable of reproducing the signature using a random initial estimate of the source time series in conjunction with a good estimate of the Green's function. Normalized cross correlation between the known transmitted signature and its deconvolved estimate are calculated for the two experimental cases and indicate that both magnitude and phase spectra are faithfully reconstructed. Additional constraints on the optimization process are easily incorporated, providing an extremely general procedure for optimization quite independent of calculus-based approaches (i.e., derivative-based methods). RP SMITH, JF (reprint author), USN,RES LAB,DIV ACOUST,WASHINGTON,DC 20375, USA. NR 17 TC 5 Z9 5 U1 0 U2 0 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0001-4966 J9 J ACOUST SOC AM JI J. Acoust. Soc. Am. PD OCT PY 1993 VL 94 IS 4 BP 2315 EP 2325 DI 10.1121/1.407473 PG 11 WC Acoustics; Audiology & Speech-Language Pathology SC Acoustics; Audiology & Speech-Language Pathology GA MB552 UT WOS:A1993MB55200040 ER PT J AU KENNEDY, RM AF KENNEDY, RM TI ACOUSTIC RADIATION DUE TO SURFACE-WAVE BREAKING SO JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA LA English DT Letter ID SEA-SURFACE AB The results of a recent paper [R. M. Kennedy, J. Acoust. Soc. Am. 91, 1974-1982 (1992)] are corrected and extended to quantitatively relate parameters of the spectrum of sea-surface-generated acoustic radiation to parameters of surface gravity wave breaking. Specifically the frequency of the maximum acoustic energy spectrum scales with the characteristic length of the wave-breaking process and the acoustic energy seales directly with wave energy dissipated by wave breaking. Furthermore, it is shown that the measured fraction of the wave energy dissipated by wave breaking that is radiated as acoustic energy agrees closely with similar laboratory measurements [M. R. Loewen and W. K. Melville, J. Fluid Mech. 224, 601-623 (1991)]. This latter result requires a correction be made to parameters found in the original paper. These conclusions have important implications to acoustical oceanography objectives. RP USN, CTR UNDERSEA WARFARE, DEPT TEST & EVALUAT, W PALM BEACH, FL 33402 USA. NR 9 TC 4 Z9 4 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 OCT PY 1993 VL 94 IS 4 BP 2443 EP 2445 DI 10.1121/1.407466 PG 3 WC Acoustics; Audiology & Speech-Language Pathology SC Acoustics; Audiology & Speech-Language Pathology GA MB552 UT WOS:A1993MB55200056 ER PT J AU JONES, RL REIDY, RF MESS, D AF JONES, RL REIDY, RF MESS, D TI VANADATE HOT CORROSION BEHAVIOR OF INDIA, YTTRIA-STABILIZED ZIRCONIA SO JOURNAL OF THE AMERICAN CERAMIC SOCIETY LA English DT Note ID OPTICAL BASICITY CONCEPT; SOLID-SOLUTIONS; SYSTEM AB Powders of In2O3-Y2O3 ''dual stabilized'' ZrO2 (IYSZ) were prepared using sol-gel procedures and tested for resistance to destabilization by molten NaVO3 at 700-degrees and 900-degrees-C. IYSZ powders with stabilizer oxide compositions ranging from 100% down to about 50% In2O3 were superior to 100%-Y2O3-stabilized ZrO2 (YSZ) in resistance to destabilization, especially at 700-degrees-C. Small additions of Y2O3 were speculated to reduce the acidity of the ZrO2 oxide anion lattice, and, therefore, improve bonding of In2O3 (more acidic than Y2O3) into the ZrO2 lattice. C1 CAMBRIDGE MICROTECH INC,CAMBRIDGE,MA 02139. RP JONES, RL (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 9 TC 17 Z9 17 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 OCT PY 1993 VL 76 IS 10 BP 2660 EP 2662 DI 10.1111/j.1151-2916.1993.tb03995.x PG 3 WC Materials Science, Ceramics SC Materials Science GA MC308 UT WOS:A1993MC30800035 ER PT J AU KELLY, JR COHEN, ME TESK, JA AF KELLY, JR COHEN, ME TESK, JA TI ERROR PROPAGATION BIASES IN THE CALCULATION OF INDENTATION FRACTURE-TOUGHNESS FOR CERAMICS SO JOURNAL OF THE AMERICAN CERAMIC SOCIETY LA English DT Note ID CRACK AB Indentation fracture toughness models generally share the derived parameter Pc-3/2, where P is the indentation load and c the measured crack length. Biases, inherent to error propagation through this nonlinear transformation (c to c3/2), can be introduced into calculated values for K(IC), depending upon the amount of averaging of crack length data performed prior to the transformation. This work utilizes Monte Carlo simulations to evaluate the bias in K(IC) calculated using both mean and linear regression methods. Significant positive biases were demonstrated when using mean-based calculations where coefficients of variation (cv) in c exceeded 10%. Regression methods produced significantly less bias. With cv < 10% or when c is averaged per load, both methods produce essentially unbiased estimates for K(IC). C1 USN,DENT RES INST,GREAT LAKES,IL 60088. RP KELLY, JR (reprint author), NATL INST STAND & TECHNOL,DENT & MED MAT GRP,GAITHERSBURG,MD 20899, USA. NR 13 TC 8 Z9 8 U1 0 U2 2 PU AMER CERAMIC SOC PI WESTERVILLE PA 735 CERAMIC PLACE, PO BOX 6136, WESTERVILLE, OH 43081-6136 SN 0002-7820 J9 J AM CERAM SOC JI J. Am. Ceram. Soc. PD OCT PY 1993 VL 76 IS 10 BP 2665 EP 2668 DI 10.1111/j.1151-2916.1993.tb03997.x PG 4 WC Materials Science, Ceramics SC Materials Science GA MC308 UT WOS:A1993MC30800037 ER PT J AU EVERSOLE, JD LIN, HB HUSTON, AL CAMPILLO, AJ LEUNG, PT LIU, SY YOUNG, K AF EVERSOLE, JD LIN, HB HUSTON, AL CAMPILLO, AJ LEUNG, PT LIU, SY YOUNG, K TI HIGH-PRECISION IDENTIFICATION OF MORPHOLOGY-DEPENDENT RESONANCES IN OPTICAL PROCESSES IN MICRODROPLETS SO JOURNAL OF THE OPTICAL SOCIETY OF AMERICA B-OPTICAL PHYSICS LA English DT Article ID STIMULATED RAMAN-SCATTERING; INHIBITED SPONTANEOUS EMISSION; BRILLOUIN-SCATTERING; DIELECTRIC MICROSPHERES; LASER-EMISSION; DROPLETS; CAVITY; FLUORESCENCE; ALGORITHM; SPECTRUM AB The spectroscopy of the morphology-dependent resonances of a microdroplet has been studied at high precision. The line positions are shown to reveal optical dispersion and permit the refractive index to be determined with sufficient accuracy to provide an estimate of the droplet cooling that is due to evaporation. Comparison of the remaining discrepancies in mode positions for different radial modes indicates a small temperature gradient near the surface. Both the cooling and the temperature gradient are compatible with thermodynamic estimates. The mode quantum numbers are identified with high confidence, and the systematics of the line intensities permit an estimate of the extra radiative loss 1/Q(L) over and above that predicted by Lorenz-Mie theory for a perfect homogeneous microsphere, for example, that which is due to internal scattering, with Q(L) almost-equal-to 2 x 10(8) for first-order modes. C1 CHINESE UNIV HONG KONG,DEPT PHYS,SHA TIN,HONG KONG. RP EVERSOLE, JD (reprint author), USN,RES LAB,CODE 5646,WASHINGTON,DC 20375, USA. NR 38 TC 76 Z9 76 U1 2 U2 12 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 OCT PY 1993 VL 10 IS 10 BP 1955 EP 1968 DI 10.1364/JOSAB.10.001955 PG 14 WC Optics SC Optics GA MB553 UT WOS:A1993MB55300019 ER EF