FN Thomson Reuters Web of Science™ VR 1.0 PT J AU LI, JCM IMAM, MA RATH, BB AF LI, JCM IMAM, MA RATH, BB TI DISLOCATION EMISSION FROM GRAIN-BOUNDARIES DURING RAPID HEATING OR COOLING SO JOURNAL OF MATERIALS SCIENCE LETTERS LA English DT Article RP LI, JCM (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 13 TC 1 Z9 3 U1 1 U2 1 PU CHAPMAN HALL LTD PI LONDON PA 2-6 BOUNDARY ROW, LONDON, ENGLAND SE1 8HN SN 0261-8028 J9 J MATER SCI LETT JI J. Mater. Sci. Lett. PD JUL 1 PY 1992 VL 11 IS 13 BP 906 EP 908 DI 10.1007/BF00729090 PG 3 WC Materials Science, Multidisciplinary SC Materials Science GA JD685 UT WOS:A1992JD68500003 ER PT J AU CARTER, WH AF CARTER, WH TI DIFFERENCE IN THE DEFINITIONS OF COHERENCE IN THE SPACE-TIME DOMAIN AND IN THE SPACE-FREQUENCY DOMAIN SO JOURNAL OF MODERN OPTICS LA English DT Article AB Coherence in the space-time domain and in the space-frequency domain are compared and found to be non-equivalent. Coherence in the space-time domain is sufficient for coherence in the space-frequency domain. Coherence in the space-frequency domain is not sufficient for coherence in the space-time domain. The source spectrum as well as coherence in the space-frequency domain effect coherence in the space-time domain. The coherence in the radiation field from two very different localized sources is studied. It is found that the fields are coherent throughout the far field region only if the sources are monochromatic. C1 JOHNS HOPKINS UNIV,APPL PHYS LAB,LAUREL,MD 20723. RP CARTER, WH (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 3 TC 4 Z9 4 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 JUL PY 1992 VL 39 IS 7 BP 1461 EP 1470 DI 10.1080/09500349214551491 PG 10 WC Optics SC Optics GA JH188 UT WOS:A1992JH18800005 ER PT J AU GILLESPIE, DJ EHRLICH, AC AF GILLESPIE, DJ EHRLICH, AC TI ELECTRICAL-CONDUCTION IN PARTIALLY CARBONIZED PAN-BASED FIBERS SO JOURNAL OF NON-CRYSTALLINE SOLIDS LA English DT Article ID ELECTRONIC-PROPERTIES; POLYACRYLONITRILE; STABILIZATION AB The electrical resistivity in partially carbonized fibers fabricated from polyacrylonitrile has been measured between 2 and 300 K. The fibers had a maximum heat treatment temperature, T(HT), of 600, 675, 700 and 760-degrees-C. The temperature dependence of the resistivity can be interpreted on the basis of two different conducting mechanisms. Below T(HT) is similar to 700-degrees-C, the electrical conduction is dominated by three-dimensional variable-range hopping of the localized electrons. At T(HT) is similar to 700-degrees-C, thermally activated tunneling between small regions (approximately 10 angstrom in diameter) of delocalized electrons begin to dominate the conduction. RP GILLESPIE, DJ (reprint author), USN,RES LAB,CODE 6341,WASHINGTON,DC 20375, USA. NR 18 TC 5 Z9 5 U1 0 U2 2 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 JUL PY 1992 VL 144 IS 2-3 BP 231 EP 239 DI 10.1016/S0022-3093(05)80405-3 PG 9 WC Materials Science, Ceramics; Materials Science, Multidisciplinary SC Materials Science GA JH799 UT WOS:A1992JH79900014 ER PT J AU WU, CT AF WU, CT TI PROTOCOL VS MULTIPLE INHERITANCE SO JOURNAL OF OBJECT-ORIENTED PROGRAMMING LA English DT Article C1 USN,DEPT COMP SCI,MONTEREY,CA 93940. NR 0 TC 0 Z9 0 U1 0 U2 0 PU SIGS PUBLICATIONS INC PI NEW YORK PA 588 BROADWAY SUITE 604, NEW YORK, NY 10012-5408 SN 0896-8438 J9 J OBJECT-ORIENT PROG JI J. Object-Oriented Program. PD JUL-AUG PY 1992 VL 5 IS 4 BP 72 EP 75 PG 4 WC Computer Science, Software Engineering; Computer Science, Theory & Methods SC Computer Science GA JA456 UT WOS:A1992JA45600012 ER PT J AU SHUEY, TF PARKS, MM FRIENDLY, DS AF SHUEY, TF PARKS, MM FRIENDLY, DS TI RESULTS OF COMBINED SURGERY ON THE SUPERIOR OBLIQUE AND HORIZONTAL RECTUS MUSCLES FOR A-PATTERN HORIZONTAL STRABISMUS SO JOURNAL OF PEDIATRIC OPHTHALMOLOGY & STRABISMUS LA English DT Article AB Results obtained in 32 patients with A-pattern horizontal strabismus and overacting superior oblique muscles treated with combined bilateral superior oblique tenotomies and bilateral symmetric surgery on the horizontal rectus muscles were analyzed retrospectively. The magnitude of reduction of the A-pattern correlated positively (r = 0.69) with the size of the preoperative A-pattern. Overall, 27 of the 32 patients (84%) had a satisfactory reduction in their A-pattern. Esodeviated patients received less correction in the primary position than exodeviated patients. Postoperative complications were minimal if the superior oblique tendon was hooked under direct visualization, and minimal dissection was performed on the surrounding tissue prior to transecting it near the nasal side of the superior rectus muscle. RP SHUEY, TF (reprint author), USN HOSP,DEPT CLIN INVEST,SAN DIEGO,CA 92134, USA. NR 0 TC 7 Z9 7 U1 0 U2 0 PU SLACK INC PI THOROFARE PA 6900 GROVE RD, THOROFARE, NJ 08086 SN 0191-3913 J9 J PEDIATR OPHTHALMOL JI J. Pediatr. Ophthalmol. Strabismus. PD JUL-AUG PY 1992 VL 29 IS 4 BP 199 EP 201 PG 3 WC Ophthalmology; Pediatrics SC Ophthalmology; Pediatrics GA JK328 UT WOS:A1992JK32800001 PM 1512658 ER PT J AU PHILSTROM, BL KINGMAN, A CHILTON, NW IMREY, PB COHEN, M DAGOSTINO, RB HOBERMAN, D FLEISS, JL HOROWITZ, HS PROSKIN, HM LASTER, LL TRUMMEL, CL CATON, J AF PHILSTROM, BL KINGMAN, A CHILTON, NW IMREY, PB COHEN, M DAGOSTINO, RB HOBERMAN, D FLEISS, JL HOROWITZ, HS PROSKIN, HM LASTER, LL TRUMMEL, CL CATON, J TI BIOLOGICAL AND MEASUREMENT ISSUES CRITICAL TO DESIGN OF GINGIVITIS TRIALS (BRIEF SUMMARY OF COMMON GROUND) - GENERAL DISCUSSION SO JOURNAL OF PERIODONTAL RESEARCH LA English DT Discussion C1 NIDR,BETHESDA,MD 20892. TASK FORCE DESIGN & ANAL,LAWRENCEVILLE,NJ. UNIV ILLINOIS,URBANA,IL 61801. USN DENT RES,GREAT LAKES,IL. BOSTON UNIV,BOSTON,MA 02215. US FDA,ROCKVILLE,MD 20857. COLUMBIA UNIV,NEW YORK,NY 10027. EASTMAN DENT CTR,ROCHESTER,NY 14620. UNIV PENN,PHILADELPHIA,PA 19104. UNIV CONNECTICUT,STORRS,CT 06268. RP PHILSTROM, BL (reprint author), UNIV MINNESOTA,MINNEAPOLIS,MN 55455, USA. NR 1 TC 0 Z9 0 U1 0 U2 4 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 JUL PY 1992 VL 27 IS 4 BP 373 EP 377 PN 2 PG 5 WC Dentistry, Oral Surgery & Medicine SC Dentistry, Oral Surgery & Medicine GA JF125 UT WOS:A1992JF12500018 ER PT J AU COHEN, ME AF COHEN, ME TI SPECIFIC STATISTICAL CONSIDERATIONS RELEVANT TO THE DESIGN AND ANALYSIS OF GINGIVITIS TRIALS - DISCUSSION SO JOURNAL OF PERIODONTAL RESEARCH LA English DT Discussion DE STATISTICS; GINGIVITIS RP COHEN, ME (reprint author), USN,DENT RES INST,GREAT LAKES,IL 60088, USA. NR 4 TC 0 Z9 0 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 JUL PY 1992 VL 27 IS 4 BP 392 EP 394 DI 10.1111/j.1600-0765.1992.tb01703.x PN 2 PG 3 WC Dentistry, Oral Surgery & Medicine SC Dentistry, Oral Surgery & Medicine GA JF125 UT WOS:A1992JF12500021 ER PT J AU WILSON, KJ SCHADOW, KC GUTMARK, E SMITH, RA AF WILSON, KJ SCHADOW, KC GUTMARK, E SMITH, RA TI MIXING AND COMBUSTION IN A SPINNING COMBUSTOR SO JOURNAL OF PROPULSION AND POWER LA English DT Article ID FLOW AB The effect of spin on mixing and combustion in a circular duct with a primary air jet and secondary gas injection through the duct wall was studied using a spin rig, with spin rates up to 10,000 rpm. The spinning ducted flowfield was compared to stationary conditions. Spin enhanced the spreading rate of the pipe and orifice jets, resulting in a larger radial velocity component and an onset of a tangential component in the jet's core for the pipe jet and in the jet's shear layer for the orifice jet. The turbulence amplification rate was enhanced predominantly in the pipe jet. The tests showed that the duct-spin affects the flow even for a relatively short entrance duct. Measurement of the mixture ratio distribution using gas sampling probes in nonreacting tests were done with inert gas injection. Centrifugal forces affected the mixing depending on the weight of the gas relative to air. The mixing was enhanced for lighter-than-air gas and suppressed for heavier. Combustion tests included both ethylene as secondary gas and solid-fuel at the wall. In gaseous fuel combustion, the spin increased the combustion temperature due to improved mixing caused by low-molecular-weight products and reduced density. For solid-fuel combustion the spin had an adverse effect. Combustion temperatures were decreased due to reduced mixing caused by centrifugal forces acting on soot and heavy hydrocarbon products. RP WILSON, KJ (reprint author), USN,CTR AIR WARFARE,RES DEPT,CHINA LAKE,CA 93555, USA. OI Gutmark, Ephraim/0000-0001-7816-4257 NR 11 TC 0 Z9 0 U1 1 U2 3 PU AMER INST AERONAUT ASTRONAUT PI RESTON PA 1801 ALEXANDER BELL DRIVE, STE 500, RESTON, VA 22091 SN 0748-4658 J9 J PROPUL POWER JI J. Propul. Power PD JUL-AUG PY 1992 VL 8 IS 4 BP 792 EP 798 DI 10.2514/3.23551 PG 7 WC Engineering, Aerospace SC Engineering GA JC896 UT WOS:A1992JC89600010 ER PT J AU LOZIER, DW TURNER, PR AF LOZIER, DW TURNER, PR TI SYMMETRICAL LEVEL INDEX ARITHMETIC IN SIMULATION AND MODELING SO JOURNAL OF RESEARCH OF THE NATIONAL INSTITUTE OF STANDARDS AND TECHNOLOGY LA English DT Article DE COMPUTER GRAPHICS; GENERALIZED LOGARITHMS AND EXPONENTIALS; LEAST-SQUARES DATA-FITTING; OVERFLOW, UNDERFLOW, AND SCALING; PARALLEL COMPUTING; SYMMETRICAL LEVEL-INDEX ARITHMETIC AB This paper begins with a general introduction to the symmetric level-index, SLI, system of number representation and arithmetic. This system provides a robust framework in which experimental computation can be performed without the risk of failure due to overflow/underflow or to poor scaling of the original problem. There follows a brief summary of some existing computational experience with this system to illustrate its strengths in numerical, graphical and parallel computational settings. An example of the use of SLI arithmetic to overcome graphics failure in the modeling of a turbulent combustion problem is presented. The main thrust of this paper is to introduce the idea of SLI-linear least squares data fitting. The use of generalized logarithm and exponential functions is seen to offer significant improvement over the more conventional linear regression tools for fitting data from a compound exponential decay such as the decay of radioactive materials. C1 USN ACAD, DEPT MATH, ANNAPOLIS, MD 21402 USA. RP LOZIER, DW (reprint author), NATL INST STAND & TECHNOL, COMP & APPL MATH LAB, DIV APPL & COMPUTAT MATH, GAITHERSBURG, MD USA. NR 27 TC 2 Z9 2 U1 0 U2 0 PU US GOVERNMENT PRINTING OFFICE PI WASHINGTON PA SUPERINTENDENT DOCUMENTS,, WASHINGTON, DC 20402-9325 USA SN 1044-677X J9 J RES NATL INST STAN JI J. Res. Natl. Inst. Stand. Technol. PD JUL-AUG PY 1992 VL 97 IS 4 BP 471 EP 485 DI 10.6028/jres.097.020 PG 15 WC Instruments & Instrumentation; Physics, Applied SC Instruments & Instrumentation; Physics GA JT819 UT WOS:A1992JT81900002 PM 28053442 ER PT J AU RODRIGUEZ, P AF RODRIGUEZ, P TI OVERVIEW OF THE LASSII EXPERIMENT ON THE COMBINED RELEASE AND RADIATION EFFECTS SATELLITE SO JOURNAL OF SPACECRAFT AND ROCKETS LA English DT Article RP RODRIGUEZ, P (reprint author), USN,RES LAB,DIV PLASMA PHYS,SPACE PLASMA BRANCH,SPACE EXPT SECT,WASHINGTON,DC 20375, USA. NR 2 TC 5 Z9 5 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 JUL-AUG PY 1992 VL 29 IS 4 BP 564 EP 565 DI 10.2514/3.25499 PG 2 WC Engineering, Aerospace SC Engineering GA JK341 UT WOS:A1992JK34100021 ER PT J AU BAUMBACK, MM RODRIGUEZ, P WALKER, DN SIEFRING, CL AF BAUMBACK, MM RODRIGUEZ, P WALKER, DN SIEFRING, CL TI LASSII PULSED PLASMA PROBE ON CRRES SO JOURNAL OF SPACECRAFT AND ROCKETS LA English DT Note RP BAUMBACK, MM (reprint author), USN,RES LAB,DIV PLASMA PHYS,SPACE PLASMA BRANCH,SPACE EXPT SECT,WASHINGTON,DC 20375, USA. NR 5 TC 5 Z9 5 U1 1 U2 1 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 JUL-AUG PY 1992 VL 29 IS 4 BP 607 EP 609 DI 10.2514/3.55644 PG 3 WC Engineering, Aerospace SC Engineering GA JK341 UT WOS:A1992JK34100034 ER PT J AU LEBOWITZ, JL REYNOLDS, PJ AF LEBOWITZ, JL REYNOLDS, PJ TI WHAT IS QUANTUM CHAOS - PREFACE SO JOURNAL OF STATISTICAL PHYSICS LA English DT Editorial Material RP LEBOWITZ, JL (reprint author), USN,DIV PHYS,800 N QUINCY ST,ARLINGTON,VA 22217, USA. NR 0 TC 0 Z9 0 U1 1 U2 2 PU PLENUM PUBL CORP PI NEW YORK PA 233 SPRING ST, NEW YORK, NY 10013 SN 0022-4715 J9 J STAT PHYS JI J. Stat. Phys. PD JUL PY 1992 VL 68 IS 1-2 BP 1 EP 4 DI 10.1007/BF01048834 PG 4 WC Physics, Mathematical SC Physics GA JE555 UT WOS:A1992JE55500001 ER PT J AU VACCARO, RJ RAMALINGAM, CS TUFTS, DW FIELD, RL AF VACCARO, RJ RAMALINGAM, CS TUFTS, DW FIELD, RL TI LEAST-SQUARES TIME-DELAY ESTIMATION FOR TRANSIENT SIGNALS IN A MULTIPATH ENVIRONMENT SO JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA LA English DT Article AB The problem of estimating the arrival times of overlapping ocean-acoustic signals from a noisy received waveform that consists of scaled and delayed replicas of a deterministic transient signal is considered. It is assumed that the transmitted signal and the number of paths in the multipath environment are known, and an algorithm is developed that gives least-squares estimates of the amplitude and time delay of each path. A method is given to ensure that the global minimum of the error surface is found in spite of the existence of numerous local minima. The algorithm is then extended to the case in which the transmitted signal is not known precisely, but is assumed to belong to a parametric class of signals. The extended algorithm additionally obtains the parameters that characterize the transmitted signal. The algorithm is demonstrated on the class of signals consisting of gated sinusoids, using both simulated and experimental data. C1 USN,RES LAB DETACHMENT,BAY ST LOUIS,MS 39529. RP VACCARO, RJ (reprint author), UNIV RHODE ISL,DEPT ELECT ENGN,KINGSTON,RI 02881, USA. NR 21 TC 16 Z9 22 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 JUL PY 1992 VL 92 IS 1 BP 210 EP 218 DI 10.1121/1.404285 PG 9 WC Acoustics; Audiology & Speech-Language Pathology SC Acoustics; Audiology & Speech-Language Pathology GA JD134 UT WOS:A1992JD13400017 ER PT J AU WILBUR, JE MCDONALD, RJ AF WILBUR, JE MCDONALD, RJ TI NONLINEAR-ANALYSIS OF CYCLICALLY CORRELATED SPECTRAL SPREADING IN MODULATED SIGNALS SO JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA LA English DT Article ID WIGNER DISTRIBUTION; TOOL AB This paper examines the mapping from the Cohen class of bilinear time-evolutionary spectral estimators (TES) to a conjoint frequency-cycle frequency signal description for modulated acoustic signals. The transform mapping provides a cycle spectrum estimation that is used to identify cyclostationarity in modulated acoustic signals that often remains undetected in the one-dimensional time history and power spectral density (PSD). The Wigner distribution (WD) TES is derived as the case for which the PSD used in stationary analysis of acoustic signals is preserved in the Fourier transform mapping to a conjoint frequency-frequency correlation signal representation for modulated signals. Fourier transformation over temporal window centers of a pseudo-WD TES of modulated acoustic signals is shown to equate to the time-variant cyclic spectrum, defined for cyclostationary signals, evaluated along the center of a moving average estimate. A pseudo-WD TES based function mapping procedure for cycle frequency estimation of modulated acoustic signals is presented and applied to several modulated signal examples. These include the acoustic reflection from a periodically vibrating object, frequency hopped pulse trains, and bi-phase modulated continuous wave sonar signals. The function solution is shown to achieve cycle frequency estimation in - 3-dB signal-to-noise. C1 USN,CTR COASTAL SYST,ELECTROMAGNET BRANCH,PANAMA CITY,FL 32407. RP WILBUR, JE (reprint author), USN,CTR COASTAL SYST,SIGNAL & IMAGE PROC BRANCH,CODE 2230,PANAMA CITY,FL 32407, USA. NR 11 TC 6 Z9 6 U1 0 U2 0 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0001-4966 J9 J ACOUST SOC AM JI J. Acoust. Soc. Am. PD JUL PY 1992 VL 92 IS 1 BP 219 EP 230 DI 10.1121/1.404286 PG 12 WC Acoustics; Audiology & Speech-Language Pathology SC Acoustics; Audiology & Speech-Language Pathology GA JD134 UT WOS:A1992JD13400018 ER PT J AU MIGNEREY, PC FINETTE, S AF MIGNEREY, PC FINETTE, S TI MULTICHANNEL DECONVOLUTION OF AN ACOUSTIC TRANSIENT IN AN OCEANIC WAVE-GUIDE SO JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA LA English DT Article ID NUMERICAL-METHOD; NORMAL-MODES; ARRAY AB The temporal signature and source location of an acoustic pulse propagating in an oceanic waveguide is estimated from passivelv sensed multichannel data on a vertical hydrophone array. A theoretical solution for this inverse source problem is presented that incorporates both a broadband generalization of matched-field processing to estimate the source location, and a Bayesian based deconvolution algorithm operating on multichannel array data to extract the source signature. The algorithms are implemented on a massively parallel computer architecture. The theory was tested on experimental data using a chirp signal recorded on a vertical hydrophone array located approximately one convergence zone from the source. Results indicate that deconvolving the Green's function using multichannel data is important for stabilizing the inversion in the presence of environmental mismatch. The additional information about the source time series, obtained over slightly different propagation channels, limits the solution space of the usual (ill-posed) single-sensor deconvolution problem and leads to very good reconstructions of the source signature. RP MIGNEREY, PC (reprint author), USN,RES LAB,DIV ACOUST,WASHINGTON,DC 20375, USA. NR 21 TC 23 Z9 23 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 JUL PY 1992 VL 92 IS 1 BP 351 EP 364 DI 10.1121/1.404301 PG 14 WC Acoustics; Audiology & Speech-Language Pathology SC Acoustics; Audiology & Speech-Language Pathology GA JD134 UT WOS:A1992JD13400034 ER PT J AU ROHR, J DETSCH, R AF ROHR, J DETSCH, R TI A LOW SEA-STATE STUDY OF THE QUIETING EFFECT OF MONOMOLECULAR FILMS ON THE UNDERLYING AMBIENT-NOISE FIELD SO JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA LA English DT Article ID BREAKING WIND-WAVES; OCEAN SURFACE-WAVES; UNDERWATER SOUND; GENERATED NOISE; SHALLOW-WATER; BUBBLE ENTRAINMENT; IMPACT; OSCILLATIONS; MECHANISM; RAINDROPS AB A series of tests, conducted at low sea states, show that the reduction of surface-related ambient noise beneath monomolecular (slick-forming) films begins between 1 and 2 kHz and extends to at least 70 kHz. Although the amount of noise reduction varies between experiments, attenuations of up to 8 dB are common. Most of the experiments are conducted in the absence of whitecapping, where for wind speeds greater than 2 m/s, the ambient noise spectra beneath the films generally resemble those of nonfilmed, lower sea-state conditions. Laboratory experiments conducted with these same films spread upon a reservoir of seawater show that the regular bubble entrainment associated with vertically falling drops can be dramatically suppressed, and the air entrainment accompanying plunging liquid jets is characterized by a conspicuous increase in the number of smaller bubbles. Preliminary studies providing simultaneous in situ acoustic and video monitoring of the ocean surface from a meter beneath it suggest that, in the absence of whitecapping, the ambient-noise reduction beneath the slick results from a dramatic decrease of microbreaking events within it. The acoustic signatures of these microbreaking events are distinguished by individual oscillating bubbles. C1 USN,CTR SURFACE WARFARE,COASTAL SYST STN,PANAMA CITY,FL 32407. RP ROHR, J (reprint author), USN COMMAND,CTR CONTROL & OCEAN SURVEILLANCE,DIV RES DEV TEST & EVALUAT,SAN DIEGO,CA 92152, USA. NR 89 TC 3 Z9 3 U1 0 U2 2 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0001-4966 J9 J ACOUST SOC AM JI J. Acoust. Soc. Am. PD JUL PY 1992 VL 92 IS 1 BP 365 EP 383 DI 10.1121/1.404302 PG 19 WC Acoustics; Audiology & Speech-Language Pathology SC Acoustics; Audiology & Speech-Language Pathology GA JD134 UT WOS:A1992JD13400035 ER PT J AU PIQUETTE, JC AF PIQUETTE, JC TI TRANSMISSION COEFFICIENT MEASUREMENT AND IMPROVED SUBLAYER MATERIAL PROPERTY DETERMINATION FOR THICK UNDERWATER ACOUSTIC PANELS - A GENERALIZATION AND IMPROVEMENT OF THE ONION METHOD SO JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA LA English DT Article ID WAVE PROPAGATION; REFLECTION AB Modifications of the ONION panel-measurement method [J. C. Piquette, J. Acoust. Soc. Am. 85, 1029-1040 (1989)] that allow for simultaneous analysis of transmitted- and reflected-wave data are described. The revised algorithm determines more reliable values for the sound speed and loss of the material of each panel sublayer than does the algorithm that is based exclusively upon analysis of the reflected wave. Included in the revised method is a Taylor series expansion of the sound-speed function of each layer about the steady-state driving angular frequency. This Taylor series is similar to that used for the loss function in the original ONION method, and is introduced here to more accurately accommodate the frequency variation of the phase speed than does the frequency-independent model used previously. Descriptions of successful applications of the revised ONION method to experimental data are provided. The version of the ONION method described in this report has recently been adopted as the standard panel measurement method at the Underwater Sound Reference Detachment of the Naval Research Laboratory (NRL-USRD) in Orlando, FL for tests conducted in the 1- to 20-kHz frequency interval. RP PIQUETTE, JC (reprint author), USN,UNDERWATER SOUND REFERENCE DETACHMENT,POB 568337,ORLANDO,FL 32856, USA. NR 17 TC 6 Z9 6 U1 1 U2 3 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0001-4966 J9 J ACOUST SOC AM JI J. Acoust. Soc. Am. PD JUL PY 1992 VL 92 IS 1 BP 468 EP 477 DI 10.1121/1.404257 PG 10 WC Acoustics; Audiology & Speech-Language Pathology SC Acoustics; Audiology & Speech-Language Pathology GA JD134 UT WOS:A1992JD13400044 ER PT J AU JONES, RL MESS, D AF JONES, RL MESS, D TI INDIA AS A HOT CORROSION-RESISTANT STABILIZER FOR ZIRCONIA SO JOURNAL OF THE AMERICAN CERAMIC SOCIETY LA English DT Article DE INDIUM OXIDE; ZIRCONIA; STABILIZATION; CORROSION; VANADATES ID SOLID-SOLUTIONS; SULFATION; SYSTEM AB After showing that india (In2O3) resisted high-temperature reaction with SO3/Na2SO4 and vanadate melts, we prepared india-stabilized zirconia (ISZ) by a proprietary sol-gel process, and tested the material for corrosion resistance to 700-900-degrees-C molten vanadates. ISZ was superior to yttria-stabilized zirconia (YSZ) in vanadate resistance at 700-degrees-C, and essentially equivalent at 900-degrees-C. Certain differences were observed between the vanadate-induced corrosion/destabilization of ISZ and that of YSZ. C1 ALCAN ALUMINUM CORP,DIV MANLABS,CAMBRIDGE,MA 02139. RP JONES, RL (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 16 TC 33 Z9 33 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 JUL PY 1992 VL 75 IS 7 BP 1818 EP 1821 DI 10.1111/j.1151-2916.1992.tb07202.x PG 4 WC Materials Science, Ceramics SC Materials Science GA JE283 UT WOS:A1992JE28300015 ER PT J AU EWING, KJ WRIGHT, BM JAGANATHAN, J AGGARWAL, ID AF EWING, KJ WRIGHT, BM JAGANATHAN, J AGGARWAL, ID TI DISTRIBUTION OF OXIDE IN A BED OF THERMALLY DECOMPOSED ZRF4.H2O AND ITS EFFECT ON ZRF4 SUBLIMATION SO JOURNAL OF THE AMERICAN CERAMIC SOCIETY LA English DT Article; Proceedings Paper CT 93RD ANNUAL MEETING OF THE AMERICAN CERAMIC SOC CY APR 30, 1991 CL CINCINNATI, OH SP AMER CERAM SOC ID FLUORIDE OPTICAL FIBERS AB The oxide distribution in a bed of thermally decomposed zirconium fluoride monohydrate (ZrF4.H2O) is determined via inert gas carbon fusion analysis (LECO). It is shown that the oxide concentration in the bed of thermally decomposed ZrF4.H2O is a function of position in the crucible. The oxide concentration in the crucible decreases in the order, from greatest to least, surface >> bottom > sides > middle. XRD analysis and thermogravimetric analysis indicate that the predominant phase in the bottom, side, and middle regions of the bed is ZrF4, while in the surface region Zr7O9F10 is the predominant phase with traces of ZrO2 and ZrF4 present. It is proposed that the production of HF(g) from the thermal decomposition of the bottom and side regions of the bed of ZrF4.H2O causes the central region of the bed to contain a higher concentration of HF(g) than any other region in the bed. The higher concentration of HF(g) in the central region of the bed of decomposing ZrF4.H2O is expected to shift the equilibrium from formation of zirconium oxyfluoride and elimination of HF(g) toward the formation of ZrF4 and elimination of water. Thermal decomposition of different masses of ZrF4.H2O demonstrates that the oxide concentration increases in the middle of the bed as the initial mass decreases. This result is consistent with the proposed mechanism for production of different phases in the bed of material. It is also shown that thermally decomposed ZrF4.H2O can be used as feedstock for preparation of low-oxide zirconium fluoride via sublimation. The best results for sublimation from this feedstock material are obtained when the surface, which contains the highest oxide concentration, is removed before sublimation. C1 USN,RES LAB,WASHINGTON,DC 20375. NR 13 TC 1 Z9 1 U1 0 U2 4 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 JUL PY 1992 VL 75 IS 7 BP 1918 EP 1923 DI 10.1111/j.1151-2916.1992.tb07217.x PG 6 WC Materials Science, Ceramics SC Materials Science GA JE283 UT WOS:A1992JE28300030 ER PT J AU VANDERAH, TA LOWEMA, CK AF VANDERAH, TA LOWEMA, CK TI YTTRIUM SUBSTITUTION IN CAS SO JOURNAL OF THE AMERICAN CERAMIC SOCIETY LA English DT Article DE CALCIUM; YTTRIUM; SULFIDES; SUBSTITUTION; OXIDATION AB Substitution of Y3+ in CaS results in the cubic rock-salt-type solid-solution Ca1-xY2x/3 square x/3S, with x less-than-or-equal-to 0.37 and where square denotes cation vacancies that form for charge compensation. The substitution range determined from polycrystalline samples prepared at 1025-degrees-C corresponds to a solubility limit of 16 mol% Y2S3 in CaS. Evolution of the unit cell edge with x indicates that the CaS lattice expands about the cation vacancies. Single-crystal X-ray diffraction studies of samples grown from a eutectic CaCl2-KCl flux revealed no indication of superstructure formation, indicating that Ca2+, Y3+, and vacancies are disordered across the cation sites. Thermogravimetric analysis curves for Ca0.7Y0.2S, CaS, and the ternary compound CaY2S4 indicate oxidative stability up to 430-degrees, 410-degrees, and 490-degrees-C, respectively. RP VANDERAH, TA (reprint author), USN,CTR WEAP,RES DEPT,DIV CHEM,CHINA LAKE,CA 93555, USA. NR 11 TC 3 Z9 3 U1 1 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 JUL PY 1992 VL 75 IS 7 BP 1988 EP 1989 DI 10.1111/j.1151-2916.1992.tb07230.x PG 2 WC Materials Science, Ceramics SC Materials Science GA JE283 UT WOS:A1992JE28300043 ER PT J AU ROSER, M HEWETT, CA MOAZED, KL ZEIDLER, JR AF ROSER, M HEWETT, CA MOAZED, KL ZEIDLER, JR TI HIGH-TEMPERATURE RELIABILITY OF REFRACTORY-METAL OHMIC CONTACTS TO DIAMOND SO JOURNAL OF THE ELECTROCHEMICAL SOCIETY LA English DT Article ID SCHOTTKY DIODES; SEMICONDUCTING DIAMOND; THIN-FILM; ELECTRONICS; PLASMA AB Several metallization schemes using refractory metals have been demonstrated to produce ohmic contacts to diamond via a solid-state reaction process. This process utilizes existing microelectronic techniques and provides strongly adherent contacts which exhibit low contact resistance. Measurements of the long-term reliability of Mo/Au contacts formed by this process on a type IIb diamond crystal are presented here for the temperature range 450 to 625-degrees-C. The measurements consist of the resistance between two contacts as a function of isothermal annealing time over time intervals in excess of 130 h in a purified inert ambient. The Mo/Au contacts appeared to be stable and reliable at these high temperatures with no indication of deterioration or degradation of performance. C1 N CAROLINA STATE UNIV,DEPT MAT SCI & ENGN,RALEIGH,NC 27695. RP ROSER, M (reprint author), USN,CTR OCEAN SYST,SAN DIEGO,CA 92152, USA. NR 21 TC 10 Z9 10 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 JUL PY 1992 VL 139 IS 7 BP 2001 EP 2004 DI 10.1149/1.2069535 PG 4 WC Electrochemistry; Materials Science, Coatings & Films SC Electrochemistry; Materials Science GA JD392 UT WOS:A1992JD39200040 ER PT J AU CHALMERS, RH AF CHALMERS, RH TI TAILORING SHIPBOARD ENVIRONMENTAL SPECIFICATIONS .3. RANDOM VIBRATION SO JOURNAL OF THE IES LA English DT Article DE NAVAL SHIPS; SURFACE COMBATANTS; SHIPBOARD ENVIRONMENTS; TAILORING; REQUIREMENTS; SPECIFICATIONS; VIBRATION; SPECTRAL DENSITY; MECHANICAL SHOCK; SHOCK SPECTRA; MEASURED VALUES; TEST DESIGN AB This article, the third in a three-part series, is extracted from Technical Document (TD 2071) published by the Naval Ocean Systems Center in April, 1991. Titled "Tailoring Shipboard Environmental Specifications, A Guide for Navy Program Managers," the document presents a compilation of shipboard environmental data measured over the years. The applicability of the data to the fleet of today is discussed. Methods of tailoring systems specifications and tests for the environment existing at given locations on a variety of naval ships are also included. The first article in the series (Journal of the IES, p. 25, March/April, 1992) included the Introduction, Temperature and Humidity, and Shock sections of TD 2071. The second article in the series (Journal of the IES, p. 27, May/June, 1992) covered the first part of the TD 2071 discussion of vibration. This article finishes the discussion of vibration and includes a "tailored" vibration requirement that a program manager might include in a procurement package for new shipboard systems. RP CHALMERS, RH (reprint author), USN,CTR OCEAN SYST,SAN DIEGO,CA 92152, USA. NR 0 TC 0 Z9 0 U1 0 U2 1 PU INST ENVIRONMENTAL SCI PI MT PROSPECT PA 940 E NORTHWEST HIGHWAY, MT PROSPECT, IL 60056 SN 1052-2883 J9 J IES JI J. IES PD JUL-AUG PY 1992 VL 35 IS 4 BP 61 EP 68 PG 8 WC Engineering, Environmental; Environmental Sciences; Instruments & Instrumentation SC Engineering; Environmental Sciences & Ecology; Instruments & Instrumentation GA JK445 UT WOS:A1992JK44500009 ER PT J AU MOYLE, IN WALKER, GJ SHREEVE, RP AF MOYLE, IN WALKER, GJ SHREEVE, RP TI STATOR-AVERAGED, ROTOR BLADE-TO-BLADE NEAR-WALL FLOW IN A MULTISTAGE AXIAL COMPRESSOR WITH TIP CLEARANCE VARIATION SO JOURNAL OF TURBOMACHINERY-TRANSACTIONS OF THE ASME LA English DT Article; Proceedings Paper CT 36TH INTERNATIONAL CONGRESS AND EXPOSITION ON GAS TURBINE AND AEROENGINE CY JUN 03-06, 1991 CL ORLANDO, FL AB This paper describes the effect of tip clearance changes on the pressure at the case wall of a second-stage rotor. Wall shear distributions under the rotor tip are also presented. The results show low-pressure areas extending along the rotor suction side but lying away from the blade. Pressure contours indicate the tangential loading at the tip is lower than predicted by two-dimensional calculations; however, the predicted loading is observed between the lowest pressure's path in the passage and the blade pressure side. The results suggest that a viscous or shearing layer, due to blade-to-wall relative motion, is generated on the blade side of the tip gap, which modifies the inviscid relative flow field and produces an unloading on the blade tip. RP MOYLE, IN (reprint author), USN,POSTGRAD SCH,TURBOPROPULS LAB,MONTEREY,CA 93943, USA. NR 8 TC 7 Z9 7 U1 0 U2 1 PU ASME-AMER SOC MECHANICAL ENG PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 SN 0889-504X J9 J TURBOMACH JI J. Turbomach.-Trans. ASME PD JUL PY 1992 VL 114 IS 3 BP 668 EP 674 DI 10.1115/1.2929191 PG 7 WC Engineering, Mechanical SC Engineering GA JG057 UT WOS:A1992JG05700022 ER PT J AU MINTMIRE, JW HARRISON, JA COLTON, RJ WHITE, CT AF MINTMIRE, JW HARRISON, JA COLTON, RJ WHITE, CT TI POSSIBLE MANY-BODY EFFECTS IN SCANNING TUNNELING MICROSCOPY OF MOLECULAR ADSORBATES SO JOURNAL OF VACUUM SCIENCE & TECHNOLOGY A-VACUUM SURFACES AND FILMS LA English DT Article; Proceedings Paper CT 38TH NATIONAL SYMP OF THE AMERICAN VACUUM SOC CY NOV 10-15, 1991 CL SEATTLE, WA SP AMER VACUUM SOC ID ANDERSON MODEL; CE COMPOUNDS; PHOTOEMISSION; INTERFACE; SYSTEMS AB The imaging of nonconducting adsorbates has been reported for a variety of materials using scanning tunneling microscopy. These results are unexpected because of the low densities of states these adsorbates have near the Fermi level. We discuss how screening effects could couple the adsorbate states with the substrate electronic states in the vicinity of the Fermi surface and enhance the local density of states of the adsorbate states near the Fermi level. RP MINTMIRE, JW (reprint author), USN,RES LAB,DIV CHEM,CODE 6170,WASHINGTON,DC 20375, USA. OI Mintmire, John/0000-0002-6551-0349 NR 30 TC 9 Z9 9 U1 0 U2 1 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0734-2101 J9 J VAC SCI TECHNOL A JI J. Vac. Sci. Technol. A-Vac. Surf. Films PD JUL-AUG PY 1992 VL 10 IS 4 BP 603 EP 605 DI 10.1116/1.577738 PN 1 PG 3 WC Materials Science, Coatings & Films; Physics, Applied SC Materials Science; Physics GA JE681 UT WOS:A1992JE68100005 ER PT J AU MA, DI CAMPISI, GJ QADRI, SB PECKERAR, MC AF MA, DI CAMPISI, GJ QADRI, SB PECKERAR, MC TI NONDESTRUCTIVE EVALUATION OF SILICON-ON-INSULATOR SUBSTRATES USING X-RAY DOUBLE CRYSTAL TOPOGRAPHY SO JOURNAL OF VACUUM SCIENCE & TECHNOLOGY A-VACUUM SURFACES AND FILMS LA English DT Article; Proceedings Paper CT 38TH NATIONAL SYMP OF THE AMERICAN VACUUM SOC CY NOV 10-15, 1991 CL SEATTLE, WA SP AMER VACUUM SOC ID ZONE-MELTING-RECRYSTALLIZATION; OXYGEN IMPLANTATION; POROUS SILICON; FILMS; SI AB The strain distributions of various silicon-on-insulator (SOI) wafers were studied using Bragg reflection mode double crystal topography analysis. These SOI samples included the separation by implanted oxygen (SIMOX), the zone melt recrystallization (ZMR), and the bond and etch-back silicon-on-insulator. The inherent warpage of each SOI sample was revealed by x-ray double crystal topography. Dislocation loops and surface-terminating defects were also observed on the ZMR sample. The defect density was evaluated by double crystal rocking curve analysis using a symmetric (004) setup. The relative peak intensities and full width at half-maxima were measured. The quality of superficial silicon layers of most SOI wafers was similar to the quality of a single crystal silicon, except the ZMR sample. According to these analyses, SIMOX wafers provide the best single crystal quality and consistent lattice characteristics under various fabrication processes. RP MA, DI (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 29 TC 3 Z9 3 U1 0 U2 0 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0734-2101 J9 J VAC SCI TECHNOL A JI J. Vac. Sci. Technol. A-Vac. Surf. Films PD JUL-AUG PY 1992 VL 10 IS 4 BP 1006 EP 1011 DI 10.1116/1.578194 PN 1 PG 6 WC Materials Science, Coatings & Films; Physics, Applied SC Materials Science; Physics GA JE681 UT WOS:A1992JE68100081 ER PT J AU MA, DI QADRI, SB PECKERAR, MC MCCARTHY, D AF MA, DI QADRI, SB PECKERAR, MC MCCARTHY, D TI CHARACTERIZATION OF THE ELECTRICAL BIAS INDUCED STRAIN VARIATION IN METAL-OXIDE SEMICONDUCTOR FIELD-EFFECT TRANSISTORS USING X-RAY DOUBLE CRYSTAL TOPOGRAPHY SO JOURNAL OF VACUUM SCIENCE & TECHNOLOGY A-VACUUM SURFACES AND FILMS LA English DT Article; Proceedings Paper CT 38TH NATIONAL SYMP OF THE AMERICAN VACUUM SOC CY NOV 10-15, 1991 CL SEATTLE, WA SP AMER VACUUM SOC ID SILICON; DISLOCATIONS AB N-channel metal-oxide-semiconductor field effect transistors (n-MOSFETs) were biased under different operating conditions. Superficial silicon strain patterns were recorded by reflection mode double crystal topography. Stress redistributions caused by various applied electrical field (E) biases were observed. A comparison of the electrical field induced stress and mechanically induced stress was made. Based upon this result, the amount of bias induced stress was measured. X-ray peak reflection intensity, the diffraction angle of this peak, and the full width at half-maximum (FWHM) of the x-ray double crystal rocking curves under various biases were also analyzed. All of these measurements indicate that a weak piezoelectric effect (WPE) exists in the superficial layers of MOS devices. A quantitative analysis of WPE modulus is also presented. RP MA, DI (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 33 TC 0 Z9 0 U1 0 U2 1 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0734-2101 J9 J VAC SCI TECHNOL A JI J. Vac. Sci. Technol. A-Vac. Surf. Films PD JUL-AUG PY 1992 VL 10 IS 4 BP 1012 EP 1019 DI 10.1116/1.578195 PN 1 PG 8 WC Materials Science, Coatings & Films; Physics, Applied SC Materials Science; Physics GA JE681 UT WOS:A1992JE68100082 ER PT J AU PERRY, AJ SARTWELL, BD VALVODA, V RAFAJA, D WILLIAMSON, DL NELSON, AJ AF PERRY, AJ SARTWELL, BD VALVODA, V RAFAJA, D WILLIAMSON, DL NELSON, AJ TI RESIDUAL-STRESS AND THE EFFECT OF IMPLANTED ARGON IN FILMS OF ZIRCONIUM NITRIDE MADE BY PHYSICAL VAPOR-DEPOSITION SO JOURNAL OF VACUUM SCIENCE & TECHNOLOGY A-VACUUM SURFACES AND FILMS LA English DT Article; Proceedings Paper CT 38TH NATIONAL SYMP OF THE AMERICAN VACUUM SOC CY NOV 11-15, 1991 CL SEATTLE, WA SP AMER VACUUM SOC ID X-RAY-DIFFRACTION; TIN FILMS; THIN-FILMS; COMPRESSIVE STRESS; CONSTANTS; HFN; DISCHARGES; COATINGS; ZRN; AR AB Zirconium nitride films made by reactive cathodic arc evaporation at high bias have been dual energy ion implanted with argon. It is found that the x-ray elastic constants of the unimplanted films differ from those measured under simple biaxial compressive elastic stress conditions. The effect of 1% argon implantation is to reduce both the lattice parameters and the compressive residual stress. It is considered that the argon resides on substitutional lattice sites following a softening of the implanted layers caused by the energy accompanying the implantation process. As the amount of argon implanted is increased (6% or 12%), the lattice continues to contract, but less rapidly, and the residual stress is hardly affected. It is suggested that the lattice softening continues and is accompanied by precipitation of the argon as bubbles. C1 USN,RES LAB,WASHINGTON,DC 20375. CHARLES UNIV,CS-12116 PRAGUE 6,CZECHOSLOVAKIA. COLORADO SCH MINES,DEPT PHYS,GOLDEN,CO 80401. SOLAR ENERGY RES INST,GOLDEN,CO 80401. RP PERRY, AJ (reprint author), VAC TEC SYST INC,6101 LOOKOUT RD,BOULDER,CO 80301, USA. OI Rafaja, David/0000-0003-2411-7425 NR 35 TC 21 Z9 21 U1 0 U2 5 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 JUL-AUG PY 1992 VL 10 IS 4 BP 1446 EP 1452 DI 10.1116/1.578263 PN 2 PG 7 WC Materials Science, Coatings & Films; Physics, Applied SC Materials Science; Physics GA JE682 UT WOS:A1992JE68200008 ER PT J AU JONKER, BT CHOU, WC PETROU, A WARNOCK, J AF JONKER, BT CHOU, WC PETROU, A WARNOCK, J TI SPIN SUPERLATTICE FORMATION IN ZNSE-BASED DILUTED MAGNETIC SEMICONDUCTOR HETEROSTRUCTURES SO JOURNAL OF VACUUM SCIENCE & TECHNOLOGY A-VACUUM SURFACES AND FILMS LA English DT Article; Proceedings Paper CT 38TH NATIONAL SYMP OF THE AMERICAN VACUUM SOC CY NOV 11-15, 1991 CL SEATTLE, WA SP AMER VACUUM SOC AB We have observed spin-polarized confinement of both electrons and holes in ZnSe-based single and multiple quantum well structures. The samples were grown by molecular beam epitaxy with 100 angstrom Zn0.99Fe0.01Se barriers and 100-200 angstrom ZnSe wells. In these systems, the band offsets are very small, so that the large spin-splitting of the diluted magnetic semiconductor levels dominates the alignment of both the conduction and valence bands, permitting magnetic field-tunable confinement. Magnetoreflectivity measurements show a pronounced asymmetry of the heavy hole spin-splitting, a signature of spin-dependent quantum confinement. The relative phase and near-unity intensity ratio of the "spin-up" and "spin-down" excitons confirm localization of spin-up carriers to the ZnSe wells and spin-down carriers to the ZnFeSe layers, producing a field-tunable "spin-superlattice." These results will be compared to those obtained for higher magnetic ion concentrations in the barriers. C1 SUNY BUFFALO,CTR ELECTR & ELECTROOPT MAT,BUFFALO,NY 14260. SUNY BUFFALO,DEPT PHYS & ASTRON,BUFFALO,NY 14260. IBM CORP,THOMAS J WATSON RES CTR,DIV RES,YORKTOWN HTS,NY 10598. RP JONKER, BT (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 7 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 0734-2101 J9 J VAC SCI TECHNOL A JI J. Vac. Sci. Technol. A-Vac. Surf. Films PD JUL-AUG PY 1992 VL 10 IS 4 BP 1458 EP 1461 DI 10.1116/1.578265 PN 2 PG 4 WC Materials Science, Coatings & Films; Physics, Applied SC Materials Science; Physics GA JE682 UT WOS:A1992JE68200010 ER PT J AU KIM, C QADRI, SB AF KIM, C QADRI, SB TI SYNTHESIS AND STRUCTURAL CHARACTERISTICS OF ION-BEAM SPUTTERED MULTILAYER AG/AL THIN-FILMS SO JOURNAL OF VACUUM SCIENCE & TECHNOLOGY A-VACUUM SURFACES AND FILMS LA English DT Article; Proceedings Paper CT 38TH NATIONAL SYMP OF THE AMERICAN VACUUM SOC CY NOV 11-15, 1991 CL SEATTLE, WA SP AMER VACUUM SOC ID MAGNETIC-PROPERTIES; DEPOSITION AB Multilayers of Ag/Al with layer thickness ratio of 1.7:1.0 have been deposited on Si and glass substrates using ion-beam sputtering with composition modulation wavelengths lambda ranging from 13.5 to 213 angstrom. Spatial distribution and angular dependence of deposition rates were determined by analysis of x-ray diffraction scans which showed several orders of distinct satellite peaks and well defined small angle peaks. At high modulation wavelengths (lambda > 35 angstrom), the multilayer film showed (111) preferred orientation normal to film plane. For short modulation wavelengths (lambda < 35 angstrom), other orientations appeared and peaks corresponding to Ag2Al intermetallic phase were also observed. One satellite peak corresponding to Ag2Al(100) peak was observed and gave the same modulation wavelength as the parent Ag/Al multilayer. The computer simulation analysis using square wave model is in good agreement with the observed satellite peak positions for high modulation wavelengths. The average lattice parameter of the Ag/Al multilayer reduces by 1.1% as the modulation wavelengths drops below 35 angstrom, which may be partially attributed to the presence of a significant proportion of Ag2Al interphase layers at the interface. RP KIM, C (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 16 TC 2 Z9 2 U1 1 U2 2 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0734-2101 J9 J VAC SCI TECHNOL A JI J. Vac. Sci. Technol. A-Vac. Surf. Films PD JUL-AUG PY 1992 VL 10 IS 4 BP 1503 EP 1507 DI 10.1116/1.578274 PN 2 PG 5 WC Materials Science, Coatings & Films; Physics, Applied SC Materials Science; Physics GA JE682 UT WOS:A1992JE68200019 ER PT J AU GILMORE, CM SPRAGUE, JA AF GILMORE, CM SPRAGUE, JA TI MOLECULAR-DYNAMICS STUDY OF FILM GROWTH WITH ENERGETIC AG-ATOMS SO JOURNAL OF VACUUM SCIENCE & TECHNOLOGY A-VACUUM SURFACES AND FILMS LA English DT Article; Proceedings Paper CT 38TH NATIONAL SYMP OF THE AMERICAN VACUUM SOC CY NOV 11-15, 1991 CL SEATTLE, WA SP AMER VACUUM SOC ID DEPOSITION; METALS AB Three-dimensional molecular-dynamics simulation of the growth of silver (Ag) atoms on an Ag (111) oriented substrate has been conducted as a function of incident atom energy and temperature. Incident atom energies of 0. 1 eV per atom resulted in the formation of epitaxial islands that coalesced to form a continuous thin film. Increasing the incident atom energy promoted layer-by-layer growth, and with an incident atom energy of 10 eV per atom the film growth was nearly layer-by-layer. For the 10-eV incident atom energy with a 330-K substrate temperature a small amount of interface mixing was observed, but the mixing was eliminated by lowering the substrate to 30 K. The interface mixing process occurred by an exchange process between the energetic atom and a surface atom. Increasing the incident atom energy to 20 eV per atom increased the amount of interface mixing, but the interface mixing could not be eliminated by lowering the temperature of the substrate. This indicates that the mixing process is ballistically activated and thermally assisted. Increasing the incident atom energies to 40 eV per atom resulted in the mixing extending to the second layer of substrate atoms; however, the mixing was found to occur by multiple unrelated exchanges between adjacent layers. All deposited atoms were observed to form epitaxial layers; although stacking faults were observed. C1 USN,RES LAB,SURFACE MODIFICAT BRANCH,WASHINGTON,DC 20375. RP GILMORE, CM (reprint author), GEORGE WASHINGTON UNIV,SCH ENGN & APPL SCI,WASHINGTON,DC 20052, USA. NR 9 TC 17 Z9 17 U1 0 U2 2 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0734-2101 J9 J VAC SCI TECHNOL A JI J. Vac. Sci. Technol. A-Vac. Surf. Films PD JUL-AUG PY 1992 VL 10 IS 4 BP 1597 EP 1599 DI 10.1116/1.578050 PN 2 PG 3 WC Materials Science, Coatings & Films; Physics, Applied SC Materials Science; Physics GA JE682 UT WOS:A1992JE68200036 ER PT J AU DAGATA, JA TSENG, W BENNETT, J DOBISZ, EA SCHNEIR, J HARARY, HH AF DAGATA, JA TSENG, W BENNETT, J DOBISZ, EA SCHNEIR, J HARARY, HH TI INTEGRATION OF SCANNING TUNNELING MICROSCOPE NANOLITHOGRAPHY AND ELECTRONICS DEVICE PROCESSING SO JOURNAL OF VACUUM SCIENCE & TECHNOLOGY A-VACUUM SURFACES AND FILMS LA English DT Article; Proceedings Paper CT 38TH NATIONAL SYMP OF THE AMERICAN VACUUM SOC CY NOV 11-15, 1991 CL SEATTLE, WA SP AMER VACUUM SOC ID GAAS-SURFACES; AIR; SILICON; PASSIVATION AB The emerging field of nanoelectronics demands innovative methods to fabricate nanometer-scale structures. Such structures will play a critical role in the quantum-effect device physics of future highly integrated circuit architectures. An integrated approach to compound semiconductor nanostructure fabrication based on scanning tunneling microscope (STM) nanolithography, molecular-beam epitaxy, and reactive ion etching techniques is described. The critical elements of this approach, which have been demonstrated recently, are reviewed. Prospects for the coevolutionary development of nanoelectronics and STM-based fabrication and characterization are considered. C1 USN,RES LAB,WASHINGTON,DC 20375. RP DAGATA, JA (reprint author), NATL INST STAND & TECHNOL,GAITHERSBURG,MD 20899, USA. NR 13 TC 43 Z9 43 U1 1 U2 1 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0734-2101 J9 J VAC SCI TECHNOL A JI J. Vac. Sci. Technol. A-Vac. Surf. Films PD JUL-AUG PY 1992 VL 10 IS 4 BP 2105 EP 2113 DI 10.1116/1.577990 PN 2 PG 9 WC Materials Science, Coatings & Films; Physics, Applied SC Materials Science; Physics GA JE682 UT WOS:A1992JE68200119 ER PT J AU MEYER, JR HOFFMAN, CA BARTOLI, FJ WOJTOWICZ, T DOBROWOLSKA, M FURDYNA, JK CHU, X FAURIE, JP RAMMOHAN, LR AF MEYER, JR HOFFMAN, CA BARTOLI, FJ WOJTOWICZ, T DOBROWOLSKA, M FURDYNA, JK CHU, X FAURIE, JP RAMMOHAN, LR TI MAGNETIC GENERATION OF ELECTRONS AND HOLES IN SEMIMETALLIC HGTE-CDTE SUPERLATTICES SO JOURNAL OF VACUUM SCIENCE & TECHNOLOGY B LA English DT Article ID CYCLOTRON-RESONANCE; GAP; TRANSITION; TRANSPORT AB We predict theoretically, on the basis of field-dependent band structure considerations, that it. should be possible to generate a high-density electron-hole plasma in semimetallic HgTe-CdTe superlattices simply by applying a magnetic field. When the field is above a critical value, minority carriers should coexist with majority carriers in the zero-temperature limit, with both densities increasing as B - B(crit). Experimental confirmation of this unique effect is provided by low-temperature magneto-optical data showing the emergence of minority holes in two n-type superlattices whenever B > B(crit). C1 UNIV NOTRE DAME,DEPT PHYS,NOTRE DAME,IN 46556. UNIV ILLINOIS,CHICAGO,IL 60680. WORCESTER POLYTECH INST,WORCESTER,MA 01609. RP MEYER, JR (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. RI Ram-Mohan, Ramdas/C-5167-2012; Wojtowicz, Tomasz/A-2887-2017 NR 12 TC 4 Z9 4 U1 0 U2 1 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 1071-1023 J9 J VAC SCI TECHNOL B JI J. Vac. Sci. Technol. B PD JUL-AUG PY 1992 VL 10 IS 4 BP 1582 EP 1586 DI 10.1116/1.586252 PG 5 WC Engineering, Electrical & Electronic; Nanoscience & Nanotechnology; Physics, Applied SC Engineering; Science & Technology - Other Topics; Physics GA JJ600 UT WOS:A1992JJ60000055 ER PT J AU HOFFMAN, CA MEYER, JR BARTOLI, FJ LANSARI, Y COOK, JW SCHETZINA, JF AF HOFFMAN, CA MEYER, JR BARTOLI, FJ LANSARI, Y COOK, JW SCHETZINA, JF TI QUANTUM HALL-EFFECT AND SETBACK MODULATION DOPING IN HGTE-CDTE HETEROSTRUCTURES SO JOURNAL OF VACUUM SCIENCE & TECHNOLOGY B LA English DT Article ID MOLECULAR-BEAM EPITAXY; SHUBNIKOV-DEHAAS OSCILLATIONS; SUPERLATTICES; ELECTRON; TRANSPORT; MAGNETOTRANSPORT; GROWTH; GAP AB HgTe-CdTe superlattices with electron concentrations up to 3 X 10(17) cm-3 have been grown by photoassisted molecular-beam epitaxy with controlled indium doping of the CdTe barriers. Magnetotransport measurements indicate that the low-temperature electron mobility is relatively independent of donor concentration at large N(D), in contrast to the Hg1-xCdxTe alloy system in which mu(n) strongly decreases with N(D). Also studied are the first Hg-based heterostructures with setback doping, i.e., with an undoped spacer layer between the donors in the middle of the barriers and the electrons in the quantum wells. A 43 angstrom setback is found to produce a factor of 2 mobility increase over any measured previously in heavily doped samples, and an 81 angstrom setback leads to further enhancement of mu(n). All superlattices with doping levels greater-than-or-equal-to 8 X 10(15) cm-3 display the quantum Hall effect. Quantization of the Hall conductivity in multiples of almost-equal-to N(W)e2/h indicates participation by nearly all of the N(W) periods in the superlattice, implying that the controlled doping is extremely uniform. C1 N CAROLINA STATE UNIV,RALEIGH,NC 27695. RP HOFFMAN, CA (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 21 TC 2 Z9 2 U1 1 U2 3 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 1071-1023 J9 J VAC SCI TECHNOL B JI J. Vac. Sci. Technol. B PD JUL-AUG PY 1992 VL 10 IS 4 BP 1638 EP 1642 DI 10.1116/1.586261 PG 5 WC Engineering, Electrical & Electronic; Nanoscience & Nanotechnology; Physics, Applied SC Engineering; Science & Technology - Other Topics; Physics GA JJ600 UT WOS:A1992JJ60000064 ER PT J AU ZVANUT, ME CARLOS, WE TWIGG, ME STAHLBUSH, RE GODBEY, DJ AF ZVANUT, ME CARLOS, WE TWIGG, ME STAHLBUSH, RE GODBEY, DJ TI INTERFACIAL POINT-DEFECTS IN HEAVILY IMPLANTED SILICON GERMANIUM ALLOYS SO JOURNAL OF VACUUM SCIENCE & TECHNOLOGY B LA English DT Article ID ELECTRON-SPIN RESONANCE; ON-INSULATOR; HETEROSTRUCTURES; CENTERS AB Comparing electron paramagnetic resonance (EPR) spectra from samples of two different alloy compositions we develop a structural model for SG1, a Ge dangling bond defect in 0 implanted SiGe. Analysis of the angular dependence of EPR spectra from measurements of 10% and 40% Ge alloys reveals that in both cases the defect exhibits [111] symmetry of the Si lattice; however, the defect in the 40% alloy exhibits a larger g(perpendicular-to) and broader linewidth than the defect in the 10% alloys. From these observations we propose that for both alloy compositions SG1 is a trivalently bonded Ge atom, and we suggest that the center in the 40% Ge alloy involves a greater number of Ge backbonds than the center in 10% Ge samples. That implantation with Ne does not produce SG1 provides evidence to suggest that the defect is located at interfaces between the SiGe alloy and SiO2 precipitates formed by oxygen implantation. RP ZVANUT, ME (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 18 TC 16 Z9 16 U1 0 U2 2 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 1071-1023 J9 J VAC SCI TECHNOL B JI J. Vac. Sci. Technol. B PD JUL-AUG PY 1992 VL 10 IS 4 BP 2026 EP 2029 DI 10.1116/1.586310 PG 4 WC Engineering, Electrical & Electronic; Nanoscience & Nanotechnology; Physics, Applied SC Engineering; Science & Technology - Other Topics; Physics GA JJ600 UT WOS:A1992JJ60000134 ER PT J AU HULL, AJ RADCLIFFE, CJ AF HULL, AJ RADCLIFFE, CJ TI EXPERIMENTAL-VERIFICATION OF THE NONSELF-ADJOINT STATE-SPACE DUCT MODEL SO JOURNAL OF VIBRATION AND ACOUSTICS-TRANSACTIONS OF THE ASME LA English DT Article AB Experimental verification of the nonself-adjoint state space duct model obtained previously by the authors is presented. Both pressure excitation at the end and mass flow excitation in the domain are analyzed and the resulting models are experimentally verified. Frequency response validations for both constant and frequency varying nonconstant impedance at the termination end of the duct are presented. The laboratory duct's response to an impulsive pressure input is shown to be well predicted by the plane wave, state space model. RP HULL, AJ (reprint author), USN,CTR UNDERWATER SYST,NEW LONDON,CT 06320, USA. NR 0 TC 6 Z9 6 U1 0 U2 0 PU ASME-AMER SOC MECHANICAL ENG PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 SN 1048-9002 J9 J VIB ACOUST JI J. Vib. Acoust.-Trans. ASME PD JUL PY 1992 VL 114 IS 3 BP 404 EP 408 DI 10.1115/1.2930276 PG 5 WC Acoustics; Engineering, Mechanical; Mechanics SC Acoustics; Engineering; Mechanics GA JE731 UT WOS:A1992JE73100017 ER PT J AU KARLE, IL AF KARLE, IL TI THE 4TH EHRLICH,PAUL LECTURE IMAGING IN THEORY AND PRAXIS - FROM EHRLICH,PAUL RECEPTORS TO MODERN ROENTGEN ANALYSIS SO MEDICINAL RESEARCH REVIEWS LA English DT Article ID ANTAMANIDE; COMPLEX; CONFORMATION; CRYSTALS RP KARLE, IL (reprint author), USN,RES LAB,STRUCT MATTER LAB,CODE 6030,WASHINGTON,DC 20375, USA. NR 33 TC 0 Z9 0 U1 0 U2 0 PU JOHN WILEY & SONS INC PI NEW YORK PA 605 THIRD AVE, NEW YORK, NY 10158-0012 SN 0198-6325 J9 MED RES REV JI Med. Res. Rev. PD JUL PY 1992 VL 12 IS 4 BP 297 EP 315 DI 10.1002/med.2610120402 PG 19 WC Chemistry, Medicinal; Pharmacology & Pharmacy SC Pharmacology & Pharmacy GA JA617 UT WOS:A1992JA61700001 PM 1326688 ER PT J AU JANASWAMY, R AF JANASWAMY, R TI 2-D RADIATION BOUNDARY-CONDITIONS ON AN ARBITRARY OUTER BOUNDARY SO MICROWAVE AND OPTICAL TECHNOLOGY LETTERS LA English DT Article DE RADIATION CONDITIONS; ELECTROMAGNETIC WAVES; SCATTERING AB First- and second-order radiation boundary conditions applicable lo any piecewise smooth outer boundary are presented. The boundary conditions are numerically implemented into an integral equation and comparison is made with exact solution to establish their validity. RP JANASWAMY, R (reprint author), USN,POSTGRAD SCH,DEPT ELECT & COMP ENGN,MONTEREY,CA 93943, USA. NR 0 TC 7 Z9 7 U1 0 U2 0 PU JOHN WILEY & SONS INC PI NEW YORK PA 605 THIRD AVE, NEW YORK, NY 10158-0012 SN 0895-2477 J9 MICROW OPT TECHN LET JI Microw. Opt. Technol. Lett. PD JUL PY 1992 VL 5 IS 8 BP 393 EP 395 DI 10.1002/mop.4650050814 PG 3 WC Engineering, Electrical & Electronic; Optics SC Engineering; Optics GA HU352 UT WOS:A1992HU35200013 ER PT J AU WOODS, AL AF WOODS, AL TI THE MANAGEMENT OF SYMPTOMATIC BENIGN PROSTATIC HYPERPLASIA WITH THE ONCE-DAILY ALPHA1-BLOCKER, TERAZOSIN SO MILITARY MEDICINE LA English DT Article AB The once-daily alpha, blocker terazosin was administered to 36 men with symptomatic benign prostatic hyperplasia (BPH) who had previously been scheduled for transurethral resection of the prostate (TURP). At 3 months, terazosin at 5 mg q.d. produced improvements in symptom scores, peak urinary flow rates, mean urinary flow rates, and residual urine. These improvements were maintained at 6 and 9 months. Terazosin also proved to be well tolerated, with no cases of hypotension or erectile dysfunction. We conclude that terazosin is effective in relieving obstructive urinary symptoms of BPH and that it allows many patients to be placed in a "holding pattern," allowing surgery to be delayed until the disease progresses. The use of terazosin also increased the capabilities of our urologic clinic. By reducing the urgency of surgery, it allowed us to schedule TURPs more conveniently and thereby accommodate more prostate surgery within the limited resources of our clinic. As a result, the use of terazosin saved considerable CHAMPUS dollars that would otherwise have been lost to the system. RP WOODS, AL (reprint author), USN HOSP,DEPT UROL,ORLANDO,FL 32813, USA. NR 0 TC 5 Z9 5 U1 0 U2 0 PU ASSN MILITARY SURG US PI BETHESDA PA 9320 OLD GEORGETOWN RD, BETHESDA, MD 20814 SN 0026-4075 J9 MIL MED JI Milit. Med. PD JUL PY 1992 VL 157 IS 7 BP 361 EP 364 PG 4 WC Medicine, General & Internal SC General & Internal Medicine GA JD344 UT WOS:A1992JD34400013 PM 1382248 ER PT J AU PERDUE, P QUANCE, J KAZARIAN, KK HAYWARD, I ODEYALE, C WILLIAMS, T AF PERDUE, P QUANCE, J KAZARIAN, KK HAYWARD, I ODEYALE, C WILLIAMS, T TI THE SURGICAL SIGNIFICANCE OF PERSIAN GULF SAND SO MILITARY MEDICINE LA English DT Article AB Foreign bodies, in particular sand and soil particles, can cause considerable reaction in wounds and remain in tissues indefinitely. The introduction of foreign material as a contaminant in wounds and intracavitary injuries to military personnel deployed in the Persian Gulf region can be a complicating factor in treatment. Samples of desert sand from the military operational areas of the Persian Gulf were analyzed and the acute local and systemic responses of intraperitoneal contamination determined in an experimental rat model. RP PERDUE, P (reprint author), USN,MED RES INST,SEPT SHOCK PROGRAM,BETHESDA,MD 20889, USA. NR 0 TC 4 Z9 4 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 JUL PY 1992 VL 157 IS 7 BP 375 EP 377 PG 3 WC Medicine, General & Internal SC General & Internal Medicine GA JD344 UT WOS:A1992JD34400017 PM 1326730 ER PT J AU CLARIDGE, L AF CLARIDGE, L TI THE PRIVATE LIVES OF VICTORIAN WOMEN - AUTOBIOGRAPHY IN 19TH-CENTURY ENGLAND - SANDERS,V SO MODERN LANGUAGE REVIEW LA English DT Book Review RP CLARIDGE, L (reprint author), USN ACAD,ANNAPOLIS,MD 21402, USA. NR 1 TC 0 Z9 0 U1 0 U2 0 PU MODERN HUMANITIES RES ASSN PI LONDON PA KINGS COLLEGE STRAND, LONDON, ENGLAND WC2R 2LS SN 0026-7937 J9 MOD LANG REV JI Mod. Lang. Rev. PD JUL PY 1992 VL 87 BP 711 EP 713 DI 10.2307/3732965 PN 3 PG 3 WC Language & Linguistics; Literature SC Linguistics; Literature GA JF621 UT WOS:A1992JF62100057 ER PT J AU CLARIDGE, L AF CLARIDGE, L TI ANDROMEDA CHAINS - GENDER AND INTERPRETATION IN VICTORIAN LITERATURE AND ART - MUNICH,AA SO MODERN LANGUAGE REVIEW LA English DT Book Review RP CLARIDGE, L (reprint author), USN ACAD,ANNAPOLIS,MD 21402, USA. NR 1 TC 0 Z9 0 U1 0 U2 0 PU MODERN HUMANITIES RES ASSN PI LONDON PA KINGS COLLEGE STRAND, LONDON, ENGLAND WC2R 2LS SN 0026-7937 J9 MOD LANG REV JI Mod. Lang. Rev. PD JUL PY 1992 VL 87 BP 711 EP 713 DI 10.2307/3732965 PN 3 PG 3 WC Language & Linguistics; Literature SC Linguistics; Literature GA JF621 UT WOS:A1992JF62100056 ER PT J AU ROGERS, WO ROGERS, MD HEDSTROM, RC HOFFMAN, SL AF ROGERS, WO ROGERS, MD HEDSTROM, RC HOFFMAN, SL TI CHARACTERIZATION OF THE GENE ENCODING SPOROZOITE SURFACE PROTEIN-2, A PROTECTIVE PLASMODIUM-YOELII SPOROZOITE ANTIGEN SO MOLECULAR AND BIOCHEMICAL PARASITOLOGY LA English DT Article DE MALARIA; PLASMODIUM; SPOROZOITE; ANTIGEN ID T-CELLS RECOGNIZE; CIRCUMSPOROZOITE PROTEIN; MALARIA PARASITES; MONOCLONAL-ANTIBODIES; MURINE MALARIA; VACCINE; FALCIPARUM; PEPTIDE; THROMBOSPONDIN; IMMUNIZATION AB Sporozoite surface protein 2 (SSP2) is a 140-kDa, protective sporozoite surface protein from Plasmodium yoelii distinct from the circumsporozoite protein (CSP). A genomic clone containing the SSP2 gene was isolated and sequenced to determine its size, structural organization and deduced primary amino acid sequence. The coding sequence consists of a single, long open reading frame encoding 826 amino acids. The overall structure of SSP2 is similar to that of the CSP, consisting of a central region of immunogenic amino acid repeats flanked by non-repetitive sequence. SSP2 has one copy of a thrombospondin repeat motif in common with several cell adhesion molecules as well as with the CSP and the thrombospondin related anonymous protein (TRAP) of P. falciparum. Additionally, SSP2 shares substantial sequence similarity to TRAP, suggesting that TRAP is the analogue of SSP2 in P. falciparum. RP ROGERS, WO (reprint author), USN,MED RES INST,MALARIA PROGRAM,BETHESDA,MD 20889, USA. NR 33 TC 63 Z9 65 U1 0 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0166-6851 J9 MOL BIOCHEM PARASIT JI Mol. Biochem. Parasitol. PD JUL PY 1992 VL 53 IS 1-2 BP 45 EP 51 DI 10.1016/0166-6851(92)90005-5 PG 7 WC Biochemistry & Molecular Biology; Parasitology SC Biochemistry & Molecular Biology; Parasitology GA JB499 UT WOS:A1992JB49900004 PM 1501644 ER PT J AU MALLEY, KC AF MALLEY, KC TI AFFORDABILITY THROUGH COMMONALITY SO NAVAL ENGINEERS JOURNAL LA English DT Editorial Material RP MALLEY, KC (reprint author), USN,SEA SYST COMMAND,WASHINGTON,DC 20350, USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER SOC NAVAL ENG INC PI ALEXANDRIA PA 1452 DUKE STREET, ALEXANDRIA, VA 22314-3458 SN 0028-1425 J9 NAV ENG J JI Nav. Eng. J. PD JUL PY 1992 VL 104 IS 4 BP 45 EP 46 PG 2 WC Engineering, Marine; Engineering, Civil; Oceanography SC Engineering; Oceanography GA JF764 UT WOS:A1992JF76400004 ER PT J AU GRAHAM, C AF GRAHAM, C TI THE NAVY AND THE MARITIME INDUSTRIES - A NEW PARTNERSHIP SO NAVAL ENGINEERS JOURNAL LA English DT Article RP GRAHAM, C (reprint author), USN,WASHINGTON,DC 20350, USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER SOC NAVAL ENG INC PI ALEXANDRIA PA 1452 DUKE STREET, ALEXANDRIA, VA 22314-3458 SN 0028-1425 J9 NAV ENG J JI Nav. Eng. J. PD JUL PY 1992 VL 104 IS 4 BP 47 EP 51 PG 5 WC Engineering, Marine; Engineering, Civil; Oceanography SC Engineering; Oceanography GA JF764 UT WOS:A1992JF76400005 ER PT J AU MCCARTHY, RH AYYUB, BM LAI, KL AF MCCARTHY, RH AYYUB, BM LAI, KL TI STRUCTURAL RELIABILITY ASSESSMENT WITH AMBIGUITY AND VAGUENESS IN FAILURE SO NAVAL ENGINEERS JOURNAL LA English DT Discussion RP MCCARTHY, RH (reprint author), USN,SEA SYST COMMAND,DIV SUBMARINE STRUCT INTEGR,WASHINGTON,DC 20350, USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER SOC NAVAL ENG INC PI ALEXANDRIA PA 1452 DUKE STREET, ALEXANDRIA, VA 22314-3458 SN 0028-1425 J9 NAV ENG J JI Nav. Eng. J. PD JUL PY 1992 VL 104 IS 4 BP 82 EP 84 PG 3 WC Engineering, Marine; Engineering, Civil; Oceanography SC Engineering; Oceanography GA JF764 UT WOS:A1992JF76400006 ER PT J AU SCARZELLO, JF GOLDA, EM WALTERS, JD GREEN, GF AF SCARZELLO, JF GOLDA, EM WALTERS, JD GREEN, GF TI SUPERCONDUCTING APPLICATIONS TO VERY SHALLOW-WATER MINE SWEEPING SO NAVAL ENGINEERS JOURNAL LA English DT Discussion RP SCARZELLO, JF (reprint author), USN,CTR SURFACE WARFARE,WASHINGTON,DC 20350, USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER SOC NAVAL ENG INC PI ALEXANDRIA PA 1452 DUKE STREET, ALEXANDRIA, VA 22314-3458 SN 0028-1425 J9 NAV ENG J JI Nav. Eng. J. PD JUL PY 1992 VL 104 IS 4 BP 87 EP 88 PG 2 WC Engineering, Marine; Engineering, Civil; Oceanography SC Engineering; Oceanography GA JF764 UT WOS:A1992JF76400009 ER PT J AU CROUT, AE AF CROUT, AE TI PROPULSION POWERED ELECTRIC GUNS - A COMPARISON OF POWER-SYSTEM ARCHITECTURES SO NAVAL ENGINEERS JOURNAL LA English DT Discussion RP CROUT, AE (reprint author), USN,SEA SYST COMMAND,ELECT SYST SUBGRP,WASHINGTON,DC 20350, USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER SOC NAVAL ENG INC PI ALEXANDRIA PA 1452 DUKE STREET, ALEXANDRIA, VA 22314-3458 SN 0028-1425 J9 NAV ENG J JI Nav. Eng. J. PD JUL PY 1992 VL 104 IS 4 BP 88 EP 89 PG 2 WC Engineering, Marine; Engineering, Civil; Oceanography SC Engineering; Oceanography GA JF764 UT WOS:A1992JF76400010 ER PT J AU BROOME, G MEYER, VA AF BROOME, G MEYER, VA TI NAVAL SURFACE WARFARE VISION 2030 SO NAVAL ENGINEERS JOURNAL LA English DT Discussion RP BROOME, G (reprint author), USN,SEA SYST COMMAND NAVSEA 5111,DIV SURFACE SHIP CONCEPTS,WASHINGTON,DC 20350, USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER SOC NAVAL ENG INC PI ALEXANDRIA PA 1452 DUKE STREET, ALEXANDRIA, VA 22314-3458 SN 0028-1425 J9 NAV ENG J JI Nav. Eng. J. PD JUL PY 1992 VL 104 IS 4 BP 89 EP 91 PG 3 WC Engineering, Marine; Engineering, Civil; Oceanography SC Engineering; Oceanography GA JF764 UT WOS:A1992JF76400011 ER PT J AU SUMMERS, AB SMOOKLER, A ALIG, C AF SUMMERS, AB SMOOKLER, A ALIG, C TI THE NAVY SHIPBOARD WASTE MANAGEMENT RESEARCH-AND-DEVELOPMENT PROGRAM SO NAVAL ENGINEERS JOURNAL LA English DT Discussion RP SUMMERS, AB (reprint author), USN,SEA SYST COMMAND,DDG51 CLASS SHIP DESIGN,WASHINGTON,DC 20350, USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER SOC NAVAL ENG INC PI ALEXANDRIA PA 1452 DUKE STREET, ALEXANDRIA, VA 22314-3458 SN 0028-1425 J9 NAV ENG J JI Nav. Eng. J. PD JUL PY 1992 VL 104 IS 4 BP 92 EP 93 PG 2 WC Engineering, Marine; Engineering, Civil; Oceanography SC Engineering; Oceanography GA JF764 UT WOS:A1992JF76400012 ER PT J AU MCCOMAS, JP SARGENT, DP STEWARD, PE AF MCCOMAS, JP SARGENT, DP STEWARD, PE TI CAPTURING MAINTENANCE AND MODERNIZATION EFFICIENCIES SO NAVAL ENGINEERS JOURNAL LA English DT Discussion C1 USN,WASHINGTON,DC 20350. 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 JUL PY 1992 VL 104 IS 4 BP 97 EP 98 PG 2 WC Engineering, Marine; Engineering, Civil; Oceanography SC Engineering; Oceanography GA JF764 UT WOS:A1992JF76400015 ER PT J AU JACOBS, KS ELFONT, M PROCACCINO, V AF JACOBS, KS ELFONT, M PROCACCINO, V TI MEASURES OF EFFECTIVENESS AS APPLIED TO MAINTENANCE PRACTICES SO NAVAL ENGINEERS JOURNAL LA English DT Discussion RP JACOBS, KS (reprint author), USN,SEA SYST COMMAND,DIV SURFACE SHIP MAINTENANCE,SEA 915B,WASHINGTON,DC 20350, USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER SOC NAVAL ENG INC PI ALEXANDRIA PA 1452 DUKE STREET, ALEXANDRIA, VA 22314-3458 SN 0028-1425 J9 NAV ENG J JI Nav. Eng. J. PD JUL PY 1992 VL 104 IS 4 BP 101 EP 102 PG 2 WC Engineering, Marine; Engineering, Civil; Oceanography SC Engineering; Oceanography GA JF764 UT WOS:A1992JF76400017 ER PT J AU GREEN, DT SOTTILARE, RA LONG, RA AF GREEN, DT SOTTILARE, RA LONG, RA TI INNOVATIONS IN TRAINING SIMULATION SO NAVAL ENGINEERS JOURNAL LA English DT Discussion RP GREEN, DT (reprint author), USN,DEPT COMBAT SYST,DAHLGREN DIV,DIV ENGN & TECHNOL,WASHINGTON,DC 20350, USA. OI Sottilare, Robert/0000-0002-5278-2441 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 JUL PY 1992 VL 104 IS 4 BP 103 EP 104 PG 2 WC Engineering, Marine; Engineering, Civil; Oceanography SC Engineering; Oceanography GA JF764 UT WOS:A1992JF76400018 ER PT J AU BILLINGSLEY, DW LINDGREN, JR SOLITARIO, WA MOORE, AP STREIFF, MA AF BILLINGSLEY, DW LINDGREN, JR SOLITARIO, WA MOORE, AP STREIFF, MA TI CAD/CAM GOES TO SEA - THE SAAR-5 DESIGN AND CONSTRUCTION SO NAVAL ENGINEERS JOURNAL LA English DT Discussion RP BILLINGSLEY, DW (reprint author), USN,SEA SYST COMMAND,SEA 507,WASHINGTON,DC 20350, USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER SOC NAVAL ENG INC PI ALEXANDRIA PA 1452 DUKE STREET, ALEXANDRIA, VA 22314-3458 SN 0028-1425 J9 NAV ENG J JI Nav. Eng. J. PD JUL PY 1992 VL 104 IS 4 BP 105 EP 106 PG 2 WC Engineering, Marine; Engineering, Civil; Oceanography SC Engineering; Oceanography GA JF764 UT WOS:A1992JF76400019 ER PT J AU HARTMAN, PJ CHOU, YC BENJAMIN, CO AF HARTMAN, PJ CHOU, YC BENJAMIN, CO TI AN AI-BASED DECISION SUPPORT SYSTEM FOR NAVAL SHIP DESIGN SO NAVAL ENGINEERS JOURNAL LA English DT Discussion RP HARTMAN, PJ (reprint author), USN,SEA SYST COMMAND,PROD INTRODUCT & INTEGR SUBGRP,WASHINGTON,DC 20350, USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER SOC NAVAL ENG INC PI ALEXANDRIA PA 1452 DUKE STREET, ALEXANDRIA, VA 22314-3458 SN 0028-1425 J9 NAV ENG J JI Nav. Eng. J. PD JUL PY 1992 VL 104 IS 4 BP 106 EP 108 PG 3 WC Engineering, Marine; Engineering, Civil; Oceanography SC Engineering; Oceanography GA JF764 UT WOS:A1992JF76400020 ER PT J AU BOYER, CT KOO, JH KNEER, MJ LIN, S SCHNEIDER, ME AF BOYER, CT KOO, JH KNEER, MJ LIN, S SCHNEIDER, ME TI A COST-EFFECTIVE APPROACH TO EVALUATE HIGH-TEMPERATURE ABLATIVES FOR MILITARY APPLICATIONS SO NAVAL ENGINEERS JOURNAL LA English DT Discussion RP BOYER, CT (reprint author), USN,CTR SURFACE WARFARE,DAHLGREN LAB,WASHINGTON,DC 20350, USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER SOC NAVAL ENG INC PI ALEXANDRIA PA 1452 DUKE STREET, ALEXANDRIA, VA 22314-3458 SN 0028-1425 J9 NAV ENG J JI Nav. Eng. J. PD JUL PY 1992 VL 104 IS 4 BP 108 EP 109 PG 2 WC Engineering, Marine; Engineering, Civil; Oceanography SC Engineering; Oceanography GA JF764 UT WOS:A1992JF76400021 ER PT J AU CROUT, AE BRADLEY, TL DAVES, TM MCCAMPBELL, SL YKEMA, JI AF CROUT, AE BRADLEY, TL DAVES, TM MCCAMPBELL, SL YKEMA, JI TI COMPARISON OF SHOCK TEST METHODS OF MIL-S-091 DERIVED FROM A TEST ON A CIRCUIT-BREAKER AND SWITCHBOARD SO NAVAL ENGINEERS JOURNAL LA English DT Discussion RP CROUT, AE (reprint author), USN,SEA SYST COMMAND,ELECT SYST SUBGRP,WASHINGTON,DC 20350, USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER SOC NAVAL ENG INC PI ALEXANDRIA PA 1452 DUKE STREET, ALEXANDRIA, VA 22314-3458 SN 0028-1425 J9 NAV ENG J JI Nav. Eng. J. PD JUL PY 1992 VL 104 IS 4 BP 109 EP 111 PG 3 WC Engineering, Marine; Engineering, Civil; Oceanography SC Engineering; Oceanography GA JF764 UT WOS:A1992JF76400022 ER PT J AU MIHELCIC, JT HEALEY, AJ GOOD, MR AF MIHELCIC, JT HEALEY, AJ GOOD, MR TI THE NPS AUV-II AUTONOMOUS UNDERWATER VEHICLE TESTBED - DESIGN AND EXPERIMENTAL-VERIFICATION SO NAVAL ENGINEERS JOURNAL LA English DT Discussion RP MIHELCIC, JT (reprint author), USN,CTR SURFACE WARFARE,WHITE OAK DETACHMENT,DEPT UNDERWATER SYST,WASHINGTON,DC 20350, USA. NR 0 TC 1 Z9 1 U1 1 U2 1 PU AMER SOC NAVAL ENG INC PI ALEXANDRIA PA 1452 DUKE STREET, ALEXANDRIA, VA 22314-3458 SN 0028-1425 J9 NAV ENG J JI Nav. Eng. J. PD JUL PY 1992 VL 104 IS 4 BP 112 EP 113 PG 2 WC Engineering, Marine; Engineering, Civil; Oceanography SC Engineering; Oceanography GA JF764 UT WOS:A1992JF76400023 ER PT J AU SIMPSON, HL FAMME, JB TAYLOR, B AF SIMPSON, HL FAMME, JB TAYLOR, B TI INTEGRATION OF SHIP CONTROL-SYSTEMS FOR TOTAL SHIP SURVIVABILITY SO NAVAL ENGINEERS JOURNAL LA English DT Discussion RP SIMPSON, HL (reprint author), USN,CTR NAVAL SURFACE WARFARE,DEPT PROTECT SYST,WASHINGTON,DC 20350, USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER SOC NAVAL ENG INC PI ALEXANDRIA PA 1452 DUKE STREET, ALEXANDRIA, VA 22314-3458 SN 0028-1425 J9 NAV ENG J JI Nav. Eng. J. PD JUL PY 1992 VL 104 IS 4 BP 114 EP 116 PG 3 WC Engineering, Marine; Engineering, Civil; Oceanography SC Engineering; Oceanography GA JF764 UT WOS:A1992JF76400025 ER PT J AU IZAT, PF WATTS, KT WINGO, RA HOLMES, JJ LACKEY, MH AF IZAT, PF WATTS, KT WINGO, RA HOLMES, JJ LACKEY, MH TI TEST OF CLOSED-LOOP DEGAUSSING ALGORITHM ON A MINESWEEPER ENGINE SO NAVAL ENGINEERS JOURNAL LA English DT Discussion RP IZAT, PF (reprint author), USN,CTR SURFACE WARFARE,ANNAPOLIS DETACHMENT,CARDEROCK DIV,WASHINGTON,DC 20350, USA. NR 0 TC 0 Z9 0 U1 0 U2 1 PU AMER SOC NAVAL ENG INC PI ALEXANDRIA PA 1452 DUKE STREET, ALEXANDRIA, VA 22314-3458 SN 0028-1425 J9 NAV ENG J JI Nav. Eng. J. PD JUL PY 1992 VL 104 IS 4 BP 116 EP 117 PG 2 WC Engineering, Marine; Engineering, Civil; Oceanography SC Engineering; Oceanography GA JF764 UT WOS:A1992JF76400026 ER PT J AU ARMSTRONG, DR MABEY, JP BURT, AM AF ARMSTRONG, DR MABEY, JP BURT, AM TI IMPLEMENTATION OF THE SHIP CONTROL-SYSTEM FOR THE ROYAL NAVY SINGLE ROLE MINEHUNTER SO NAVAL ENGINEERS JOURNAL LA English DT Discussion RP ARMSTRONG, DR (reprint author), USN,CTR SURFACE WARFARE,CARDEROCK DIV,DAVID TAYLOR MODEL BASIN,WASHINGTON,DC 20350, USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER SOC NAVAL ENG INC PI ALEXANDRIA PA 1452 DUKE STREET, ALEXANDRIA, VA 22314-3458 SN 0028-1425 J9 NAV ENG J JI Nav. Eng. J. PD JUL PY 1992 VL 104 IS 4 BP 119 EP 121 PG 3 WC Engineering, Marine; Engineering, Civil; Oceanography SC Engineering; Oceanography GA JF764 UT WOS:A1992JF76400028 ER PT J AU PERCIVAL, RC GRIFFIN, OM PELTZER, RD REED, AM BECK, RF AF PERCIVAL, RC GRIFFIN, OM PELTZER, RD REED, AM BECK, RF TI REMOTE-SENSING OF SURFACE SHIP WAKES SO NAVAL ENGINEERS JOURNAL LA English DT Discussion RP PERCIVAL, RC (reprint author), USN,SEA SYST COMMAND,WASHINGTON,DC 20350, USA. NR 0 TC 0 Z9 0 U1 0 U2 1 PU AMER SOC NAVAL ENG INC PI ALEXANDRIA PA 1452 DUKE STREET, ALEXANDRIA, VA 22314-3458 SN 0028-1425 J9 NAV ENG J JI Nav. Eng. J. PD JUL PY 1992 VL 104 IS 4 BP 122 EP 123 PG 2 WC Engineering, Marine; Engineering, Civil; Oceanography SC Engineering; Oceanography GA JF764 UT WOS:A1992JF76400029 ER PT J AU PATTISON, JH GRAHAM, R BATIS, AE MEYERS, WG AF PATTISON, JH GRAHAM, R BATIS, AE MEYERS, WG TI ON THE DEVELOPMENT OF SEAKEEPING CRITERIA SO NAVAL ENGINEERS JOURNAL LA English DT Discussion RP PATTISON, JH (reprint author), USN,SEA SYST COMMAND,HYDRODYNAM PERFORMANCE BRANCH,WASHINGTON,DC 20350, USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER SOC NAVAL ENG INC PI ALEXANDRIA PA 1452 DUKE STREET, ALEXANDRIA, VA 22314-3458 SN 0028-1425 J9 NAV ENG J JI Nav. Eng. J. PD JUL PY 1992 VL 104 IS 4 BP 123 EP 124 PG 2 WC Engineering, Marine; Engineering, Civil; Oceanography SC Engineering; Oceanography GA JF764 UT WOS:A1992JF76400030 ER PT J AU LAST, HR AF LAST, HR TI INDUSTRIALIZATION OF THE SPRAY FORMING PROCESS FOR MILITARY APPLICATIONS SO NAVAL ENGINEERS JOURNAL LA English DT Discussion RP LAST, HR (reprint author), USN,CTR SURFACE WARFARE,DAHLGREN DIV DETACHMENT,MET MAT BRANCH,WASHINGTON,DC 20350, USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER SOC NAVAL ENG INC PI ALEXANDRIA PA 1452 DUKE STREET, ALEXANDRIA, VA 22314-3458 SN 0028-1425 J9 NAV ENG J JI Nav. Eng. J. PD JUL PY 1992 VL 104 IS 4 BP 126 EP 127 PG 2 WC Engineering, Marine; Engineering, Civil; Oceanography SC Engineering; Oceanography GA JF764 UT WOS:A1992JF76400032 ER PT J AU FISHER, WS BRAUN, D AF FISHER, WS BRAUN, D TI CLOSURE OF POSTERIOR-FOSSA DURAL DEFECTS USING A DURAL SUBSTITUTE - TECHNICAL NOTE SO NEUROSURGERY LA English DT Note DE DURAL CLOSURE; DURAL SUBSTITUTE; SURGICAL TECHNIQUES AB THE AUTHORS DESCRIBE a technique for closing the posterior fossa dura. C1 USN HOSP,DEPT NEUROSURG,BETHESDA,MD 20814. RP FISHER, WS (reprint author), UNIV ALABAMA,DIV NEUROSURG,BIRMINGHAM,AL 35294, USA. NR 4 TC 15 Z9 16 U1 0 U2 0 PU WILLIAMS & WILKINS PI BALTIMORE PA 351 WEST CAMDEN ST, BALTIMORE, MD 21201-2436 SN 0148-396X J9 NEUROSURGERY JI Neurosurgery PD JUL PY 1992 VL 31 IS 1 BP 155 EP 156 PG 2 WC Clinical Neurology; Surgery SC Neurosciences & Neurology; Surgery GA JC699 UT WOS:A1992JC69900027 PM 1641099 ER PT J AU BLUEM, H JACKSON, RH FREUND, HP PERSHING, DE GRANATSTEIN, VL AF BLUEM, H JACKSON, RH FREUND, HP PERSHING, DE GRANATSTEIN, VL TI DEMONSTRATION OF A 2ND HARMONIC FREE-ELECTRON LASER SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article; Proceedings Paper CT 13TH INTERNATIONAL CONF ON FREE ELECTRON LASER CY AUG 25-30, 1991 CL SANTA FE, NM SP USAF, OFF SCI RES, USA, STRATEG DEF COMMAND, US DOE, USN, OFF NAVAL RES, US STRATEG DEF INITIAT OFF, US NAVAL RES LAB ID NONLINEAR-ANALYSIS; AMPLIFIERS AB The first experimental demonstration of a harmonic free-electron laser amplifier-utilizing a periodic position instability is described for a planar wiggler configuration. The interaction occurs at the even harmonics of the fundamental. A maximum gain of 7 dB was observed over a frequency band ranging from 14-15 GHz. The experimental results are compared with predictions from the three-dimensional simulation code WIGGLIN with excellent agreement. C1 LOUISIANA STATE UNIV,BATON ROUGE,LA 70803. SCI APPLICAT INT CORP,MCLEAN,VA 22102. MISSION RES CORP,NEWINGTON,VA 22122. UNIV MARYLAND,COLL PK,MD 20742. RP BLUEM, H (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 16 TC 1 Z9 1 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-9002 J9 NUCL INSTRUM METH A JI Nucl. Instrum. Methods Phys. Res. Sect. A-Accel. Spectrom. Dect. Assoc. Equip. PD JUL 1 PY 1992 VL 318 IS 1-3 BP 105 EP 108 DI 10.1016/0168-9002(92)91032-5 PG 4 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA JD767 UT WOS:A1992JD76700021 ER PT J AU KIRKPATRICK, DA BERGERON, GL CZARNASKI, MA DAVIDSON, RC FREUND, HP HICKMAN, JJ MANKOFSKY, A TSANG, KT SCHNUR, JM LEVINSON, M DITCHEK, BM AF KIRKPATRICK, DA BERGERON, GL CZARNASKI, MA DAVIDSON, RC FREUND, HP HICKMAN, JJ MANKOFSKY, A TSANG, KT SCHNUR, JM LEVINSON, M DITCHEK, BM TI HIGH BRIGHTNESS ELECTRON-BEAM SOURCES FOR FEL APPLICATIONS SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article; Proceedings Paper CT 13TH INTERNATIONAL CONF ON FREE ELECTRON LASER CY AUG 25-30, 1991 CL SANTA FE, NM SP USAF, OFF SCI RES, USA, STRATEG DEF COMMAND, US DOE, USN, OFF NAVAL RES, US STRATEG DEF INITIAT OFF, US NAVAL RES LAB AB A new generation of field emitter array (FEA) cathode materials is under development at SAIC, in collaboration with NRL and GTE Laboratories. The emitter structures under consideration consist of large area (approximately 1 cm2) arrays of large numbers (approximately 10(6)) of microscopic field emitting tips. The structures can be fabricated so as to choose an emitter tip microstructure that is a solid cone, a hollow cylinder, or a variety of other shapes. These microstructures evidence very high local field enhancement factors, controllable from a factor of approximately 200 to > 2000. This large local field enhancement allows quantum field emission of significant current from the large area array while the applied macroscopic electric field is still quite low (approximately 20 kV/cm). Single-tip, noninteracting particle, multigrid simulations indicate that beam brightnesses B(n) = I/pi-2-epsilon(n)2 > 10(10) A/cm2 rad2 may be possible. Beams with such high brightnesses allow for a greatly expanded field of FEL applications, including high gain and harmonic operation in the FIR wavelength regime. Experiments have so far demonstrated DC average current densities > 1 A/cm2, uniform emission, and improved characteristics when run for long periods of time ( > 100 h, DC). Our present efforts are concentrated on optimizing the available cathode current density, measuring the actual beam brightness, and including self-field and 3-D effects in the numerical simulations. C1 USN,RES LAB,WASHINGTON,DC 20375. GTE LABS INC,WALTHAM,MA 02254. RP KIRKPATRICK, DA (reprint author), SCI APPLICAT INT CORP,1710 GOODRIDGE DR,MCLEAN,VA 22102, USA. NR 7 TC 1 Z9 1 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 JUL 1 PY 1992 VL 318 IS 1-3 BP 349 EP 352 PG 4 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA JD767 UT WOS:A1992JD76700068 ER PT J AU TANG, CM TING, AC SWYDEN, T AF TANG, CM TING, AC SWYDEN, T TI FIELD-EMISSION ARRAYS - A POTENTIALLY BRIGHT SOURCE SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article; Proceedings Paper CT 13TH INTERNATIONAL CONF ON FREE ELECTRON LASER CY AUG 25-30, 1991 CL SANTA FE, NM SP USAF, OFF SCI RES, USA, STRATEG DEF COMMAND, US DOE, USN, OFF NAVAL RES, US STRATEG DEF INITIAT OFF, US NAVAL RES LAB AB Field-emission arrays are Potentially a compact and bright electron source. Unlike a laser photocathode, external laser systems are not required. It is possible to have spatial control of the cathode emission. Temporal modulation up to 10 GHz may be possible. We estimate the emittance and brightness based on a reasonable FEA design. Since the FEAs are at an early stage of development for accelerator applications, many technical problems need to be addressed before they can become useful cathodes. RP TANG, CM (reprint author), USN,RES LAB,DIV PLASMA PHYS,BEAM PHYS BRANCH,WASHINGTON,DC 20375, USA. NR 15 TC 19 Z9 19 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 JUL 1 PY 1992 VL 318 IS 1-3 BP 353 EP 357 DI 10.1016/0168-9002(92)91080-S PG 5 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA JD767 UT WOS:A1992JD76700069 ER PT J AU LUMPKIN, AH FELDMAN, RB APGAR, SA FELDMAN, DW OSHEA, PG FIORITO, RB RULE, DW AF LUMPKIN, AH FELDMAN, RB APGAR, SA FELDMAN, DW OSHEA, PG FIORITO, RB RULE, DW TI INITIAL ELECTRON-BEAM CHARACTERIZATIONS FOR THE LOS-ALAMOS APEX FACILITY SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article; Proceedings Paper CT 13TH INTERNATIONAL CONF ON FREE ELECTRON LASER CY AUG 25-30, 1991 CL SANTA FE, NM SP USAF, OFF SCI RES, USA, STRATEG DEF COMMAND, US DOE, USN, OFF NAVAL RES, US STRATEG DEF INITIAT OFF, US NAVAL RES LAB ID OPTICAL-TRANSITION-RADIATION; LASER AB The ongoing upgrade of the Los Alamos free-electron laser (FEL) facility involves the addition of a photoelectric injector (PEI) and acceleration capability to about 40 MeV. The electron-beam and high-speed diagnostics provide key measurements of charge, beam, position and profile, divergence, emittance, energy (centroid, spread, slew, and extraction efficiency), micropulse duration, and phase stability. Preliminary results for the facility include optical transition radiation interferometer measurements of divergence (1 -2 mrad), FEL extraction efficiency (0.6 +/- 0.2%), and drive laser phase stability (< 2 ps rms). C1 USN,CTR SURFACE WARFARE,SILVER SPRING,MD 21218. RP LUMPKIN, AH (reprint author), LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545, USA. NR 11 TC 1 Z9 1 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-9002 J9 NUCL INSTRUM METH A JI Nucl. Instrum. Methods Phys. Res. Sect. A-Accel. Spectrom. Dect. Assoc. Equip. PD JUL 1 PY 1992 VL 318 IS 1-3 BP 415 EP 421 DI 10.1016/0168-9002(92)91091-M PG 7 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA JD767 UT WOS:A1992JD76700080 ER PT J AU ESAREY, E SPRANGLE, P AF ESAREY, E SPRANGLE, P TI HARMONIC-GENERATION IN LASER-PUMPED FELS AND STIMULATED BACKSCATTERING FROM PLASMAS SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article; Proceedings Paper CT 13TH INTERNATIONAL CONF ON FREE ELECTRON LASER CY AUG 25-30, 1991 CL SANTA FE, NM SP USAF, OFF SCI RES, USA, STRATEG DEF COMMAND, US DOE, USN, OFF NAVAL RES, US STRATEG DEF INITIAT OFF, US NAVAL RES LAB ID FREE-ELECTRON LASER; CHIRPED-PULSE AMPLIFICATION; HIGH-POWER; FIELD; WAVE; INSTABILITIES; SCATTERING; IONIZATION; BEAMS AB Stimulated backscattered harmonic radiation generated by the interaction of an intense pump laser field with an electron beam or plasma is analyzed using a nonlinear, relativistic, fluid theory valid to all orders in the pump laser amplitude. The backscattered radiation occurs at odd harmonics of the Doppler shifted incident laser frequency. The growth rate and saturation level of the backscattered harmonics are calculated and thermal limitations are discussed. This mechanism may provide a practical method for producing coherent radiation in the XUV regime. RP ESAREY, E (reprint author), USN,RES LAB,DIV PLASMA PHYS,BEAM PHYS BRANCH,WASHINGTON,DC 20375, USA. NR 29 TC 0 Z9 0 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-9002 J9 NUCL INSTRUM METH A JI Nucl. Instrum. Methods Phys. Res. Sect. A-Accel. Spectrom. Dect. Assoc. Equip. PD JUL 1 PY 1992 VL 318 IS 1-3 BP 533 EP 537 DI 10.1016/0168-9002(92)91113-N PG 5 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA JD767 UT WOS:A1992JD76700102 ER PT J AU HAFIZI, B SPRANGLE, P SERAFIM, P AF HAFIZI, B SPRANGLE, P SERAFIM, P TI EFFECT OF ENERGY SPREAD AND GYROMOTION ON EFFICIENCY OF A SMITH-PURCELL FEL SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article; Proceedings Paper CT 13TH INTERNATIONAL CONF ON FREE ELECTRON LASER CY AUG 25-30, 1991 CL SANTA FE, NM SP USAF, OFF SCI RES, USA, STRATEG DEF COMMAND, US DOE, USN, OFF NAVAL RES, US STRATEG DEF INITIAT OFF, US NAVAL RES LAB ID FREE-ELECTRON LASERS AB The start-oscillation current, gain and energy spread requirement for operation of a Smith-Purcell free-electron laser oscillator are determined. The effects of beam thickness, energy spread and gyromotion on the efficiency are discussed. C1 ICARUS RES,BETHESDA,MD 20814. NORTHEASTERN UNIV,BOSTON,MA 02115. RP HAFIZI, B (reprint author), USN,RES LAB,BEAM PHYS BRANCH,WASHINGTON,DC 20375, USA. NR 7 TC 2 Z9 2 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-9002 J9 NUCL INSTRUM METH A JI Nucl. Instrum. Methods Phys. Res. Sect. A-Accel. Spectrom. Dect. Assoc. Equip. PD JUL 1 PY 1992 VL 318 IS 1-3 BP 560 EP 563 DI 10.1016/0168-9002(92)91118-S PG 4 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA JD767 UT WOS:A1992JD76700107 ER PT J AU STURGESS, KA COLSON, WB AF STURGESS, KA COLSON, WB TI AN ANALYTIC DESCRIPTION OF LONGITUDINAL MODES IN FREE-ELECTRON LASERS SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article; Proceedings Paper CT 13TH INTERNATIONAL CONF ON FREE ELECTRON LASER CY AUG 25-30, 1991 CL SANTA FE, NM SP USAF, OFF SCI RES, USA, STRATEG DEF COMMAND, US DOE, USN, OFF NAVAL RES, US STRATEG DEF INITIAT OFF, US NAVAL RES LAB AB Assuming a free electron laser has weak optical fields, low gain, and a long electron pulse, it is possible to reduce the driven wave equation to a first-order, partial differential equation including electron dynamics, slippage, desynchronism, and resonator loss. This analytic method is used to study coherence development and the effect of varying the electron beam pulse shape. RP STURGESS, KA (reprint author), USN,POSTGRAD SCH,DEPT PHYS,MONTEREY,CA 93943, USA. NR 6 TC 2 Z9 2 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-9002 J9 NUCL INSTRUM METH A JI Nucl. Instrum. Methods Phys. Res. Sect. A-Accel. Spectrom. Dect. Assoc. Equip. PD JUL 1 PY 1992 VL 318 IS 1-3 BP 576 EP 581 DI 10.1016/0168-9002(92)91121-O PG 6 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA JD767 UT WOS:A1992JD76700110 ER PT J AU BICE, CA COLSON, WB AF BICE, CA COLSON, WB TI THE CEBAF ULTRAVIOLET FEL EXPERIMENT SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article; Proceedings Paper CT 13TH INTERNATIONAL CONF ON FREE ELECTRON LASER CY AUG 25-30, 1991 CL SANTA FE, NM SP USAF, OFF SCI RES, USA, STRATEG DEF COMMAND, US DOE, USN, OFF NAVAL RES, US STRATEG DEF INITIAT OFF, US NAVAL RES LAB AB Simulations are used to investigate the characteristics of the proposed CEBAF UV FEL experiment. Of particular interest is the gain degradation when the optical mode waist and the electron beam are of approximately equal size. RP BICE, CA (reprint author), USN,POSTGRAD SCH,DEPT PHYS,MONTEREY,CA 93943, USA. NR 4 TC 0 Z9 0 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-9002 J9 NUCL INSTRUM METH A JI Nucl. Instrum. Methods Phys. Res. Sect. A-Accel. Spectrom. Dect. Assoc. Equip. PD JUL 1 PY 1992 VL 318 IS 1-3 BP 606 EP 611 DI 10.1016/0168-9002(92)91126-T PG 6 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA JD767 UT WOS:A1992JD76700115 ER PT J AU CLARK, D COLSON, WB AF CLARK, D COLSON, WB TI THE CEBAF INFRARED FREE-ELECTRON LASER SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article; Proceedings Paper CT 13TH INTERNATIONAL CONF ON FREE ELECTRON LASER CY AUG 25-30, 1991 CL SANTA FE, NM SP USAF, OFF SCI RES, USA, STRATEG DEF COMMAND, US DOE, USN, OFF NAVAL RES, US STRATEG DEF INITIAT OFF, US NAVAL RES LAB AB The CEBAF infrared free electron laser is described through simulations of transverse mode propagation and longitudinal pulse evolution. of particular note are the gain calculations in the case of a small filling factor. RP CLARK, D (reprint author), USN,POSTGRAD SCH,DEPT PHYS,MONTEREY,CA 93943, USA. NR 5 TC 4 Z9 4 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-9002 J9 NUCL INSTRUM METH A JI Nucl. Instrum. Methods Phys. Res. Sect. A-Accel. Spectrom. Dect. Assoc. Equip. PD JUL 1 PY 1992 VL 318 IS 1-3 BP 612 EP 616 DI 10.1016/0168-9002(92)91127-U PG 5 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA JD767 UT WOS:A1992JD76700116 ER PT J AU TANG, CM MARABLE, WP AF TANG, CM MARABLE, WP TI 3D-SIMULATION OF HIGH-GAIN FELS IN AN OPTICAL KLYSTRON CONFIGURATION SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article; Proceedings Paper CT 13TH INTERNATIONAL CONF ON FREE ELECTRON LASER CY AUG 25-30, 1991 CL SANTA FE, NM SP USAF, OFF SCI RES, USA, STRATEG DEF COMMAND, US DOE, USN, OFF NAVAL RES, US STRATEG DEF INITIAT OFF, US NAVAL RES LAB ID FREE-ELECTRON LASER; EXPANSION AB The optical klystron is envisioned as a method of enhancing the free electron laser (FEL) gain as well as a method of obtaining high coherent harmonics. We modify the 3D computer code SHERA to include the capability of calculating FEL performance in the optical klystron configuration. The code includes: (i) energy spread and finite emittance of the electron beam, (ii) diffraction and refraction of the radiation field, and (iii) transverse gradients of the wiggler field. This paper concentrates on the physics of the optical klystron in the high gain limit. We apply this code to evaluate the preliminary FEL design options at the Continuous Electron Beam Accelerator Facility (CEBAF). C1 HAMPTON UNIV,DEPT MATH,HAMPTON,VA 23668. RP TANG, CM (reprint author), USN,RES LAB,DIV PLASMA PHYS,WASHINGTON,DC 20375, USA. NR 12 TC 6 Z9 6 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-9002 J9 NUCL INSTRUM METH A JI Nucl. Instrum. Methods Phys. Res. Sect. A-Accel. Spectrom. Dect. Assoc. Equip. PD JUL 1 PY 1992 VL 318 IS 1-3 BP 675 EP 679 DI 10.1016/0168-9002(92)91138-Y PG 5 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA JD767 UT WOS:A1992JD76700127 ER PT J AU BLAU, J COLSON, WB AF BLAU, J COLSON, WB TI 4-DIMENSIONAL SIMULATIONS OF THE CEBAF INFRARED FREE-ELECTRON LASER SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article; Proceedings Paper CT 13TH INTERNATIONAL CONF ON FREE ELECTRON LASER CY AUG 25-30, 1991 CL SANTA FE, NM SP USAF, OFF SCI RES, USA, STRATEG DEF COMMAND, US DOE, USN, OFF NAVAL RES, US STRATEG DEF INITIAT OFF, US NAVAL RES LAB AB A four-dimensional (4D) simulation in (x, y, z, t) of a free electron laser (FEL) has been developed for the case where the electron beam radius is small compared to the optical mode radius. The simulation uses the electron pendulum equation and the parabolic wave equation including the effects of diffraction and short pulse propagation. In the CEBAF IR FEL, the short electron pulse reduces gain, and the narrow electron beam can cause distortion of the optical mode. These important effects are studied simultaneously using the 4D simulations. RP BLAU, J (reprint author), USN,POSTGRAD SCH,DEPT PHYS,MONTEREY,CA 93943, USA. NR 11 TC 3 Z9 3 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 JUL 1 PY 1992 VL 318 IS 1-3 BP 717 EP 720 DI 10.1016/0168-9002(92)91145-Y PG 4 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA JD767 UT WOS:A1992JD76700134 ER PT J AU PHILLIPS, WT RUDOLPH, AS GOINS, B TIMMONS, JH KLIPPER, R BLUMHARDT, R AF PHILLIPS, WT RUDOLPH, AS GOINS, B TIMMONS, JH KLIPPER, R BLUMHARDT, R TI A SIMPLE METHOD FOR PRODUCING A TC-99M-LABELED LIPOSOME WHICH IS STABLE INVIVO SO NUCLEAR MEDICINE AND BIOLOGY LA English DT Article ID TECHNETIUM-LABELED LIPOSOMES; ENCAPSULATED HEMOGLOBIN; RADIOLABELED LIPOSOMES; TC-99M; CANCER; ACCUMULATION AB A new method for labeling preformed liposomes with technetium-99m (Tc-99m) has been developed which is simple to perform and stable in in vivo. Previous Tc-99m-liposome labels have had variable labeling efficiencies and stability. This method consistently achieves high labeling efficiencies (>90%) with excellent stability. A commercially available radiopharmaceutical kit-hexamethylpropyleneamine oxime (HM-PAO)-is reconstituted with (TcO4-)-Tc-99m and then incubated with preformed liposomes that encapsulate glutathione. The incubation takes only 30 min at room temperature. Liposomes that co-encapsulate other proteins such as hemoglobin or albumin, in addition to glutathione, also label with high efficiency. Both in vitro and in in vivo studies indicate good stability of this label. Rabbit images show significant spleen and liver uptake at 2 and 20 h after liposome infusion without visualization of thyroid, stomach or bladder activity. This labeling method can be used to study the biodistribution of a wide variety of liposome preparations that are being tested as novel drug delivery systems. This method of labeling liposomes with Tc-99m may also have applications in diagnostic imaging. C1 UNIV TEXAS,HLTH SCI CTR,DEPT NUCL MED,SAN ANTONIO,TX 78284. MADIGAN ARMY MED CTR,DEPT RADIOL,TACOMA,WA 98431. USN,RES LAB,CTR BIOMOLEC SCI & ENGN,WASHINGTON,DC 20375. RI Goins, Beth/F-1311-2010; Phillips, William/E-8427-2010 OI Phillips, William/0000-0001-8248-7817 NR 27 TC 118 Z9 120 U1 0 U2 5 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0883-2897 J9 NUCL MED BIOL JI Nucl. Med. Biol. PD JUL PY 1992 VL 19 IS 5 BP 539 EP & PG 0 WC Radiology, Nuclear Medicine & Medical Imaging SC Radiology, Nuclear Medicine & Medical Imaging GA HZ339 UT WOS:A1992HZ33900005 ER PT J AU ADAMS, JH AF ADAMS, JH TI COSMIC-RADIATION - CONSTRAINTS ON SPACE EXPLORATION SO NUCLEAR TRACKS AND RADIATION MEASUREMENTS LA English DT Article AB The hazard from cosmic radiation is examined using present cosmic ray models and the current definition of the quality factor. Current crew exposure limits are also assumed. Cosmic radiation is found to place strong constraints on manned missions to Mars. A workshop to discuss new measurements and models of galactic cosmic ray fluxes was held in August 1991. The motivation for the workshop will be explained by describing how galactic cosmic radiation constrains plans for manned space exploration and why an accurate knowledge of the absolute cosmic ray fluxes is needed to plan a manned mission to Mars. RP ADAMS, JH (reprint author), USN,RES LAB,EO HULBURT CTR SPACE RES,CODE 4154,WASHINGTON,DC 20375, USA. NR 5 TC 8 Z9 8 U1 0 U2 0 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0735-245X J9 NUCL TRACKS RAD MEAS PD JUL PY 1992 VL 20 IS 3 BP 397 EP 401 PG 5 WC Nuclear Science & Technology SC Nuclear Science & Technology GA JH942 UT WOS:A1992JH94200003 ER PT J AU BAILEY, MP AF BAILEY, MP TI MEASURING PERFORMANCE OF INTEGRATED AIR DEFENSE NETWORKS USING STOCHASTIC NETWORKS SO OPERATIONS RESEARCH LA English DT Article AB A model reflecting the evolution of an engagement between an integrated air defense system (IADS) and a penetrating strike group is presented. The engagement is modeled as an optimization problem on a network with stochastic arc lengths. We produce the distribution of our measure of effectiveness, as well as calculating the importance of each IADS agent to the performance of the overall system. We demonstrate the effectiveness of several jamming plans against the network. RP BAILEY, MP (reprint author), USN,GRAD SCH,MONTEREY,CA 93940, USA. NR 13 TC 1 Z9 1 U1 1 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 JUL-AUG PY 1992 VL 40 IS 4 BP 647 EP 659 DI 10.1287/opre.40.4.647 PG 13 WC Management; Operations Research & Management Science SC Business & Economics; Operations Research & Management Science GA JL871 UT WOS:A1992JL87100003 ER PT J AU GOLDEN, JP SHRIVERLAKE, LC ANDERSON, GP THOMPSON, RB LIGLER, FS AF GOLDEN, JP SHRIVERLAKE, LC ANDERSON, GP THOMPSON, RB LIGLER, FS TI FLUOROMETER AND TAPERED FIBER OPTIC PROBES FOR SENSING IN THE EVANESCENT WAVE SO OPTICAL ENGINEERING LA English DT Article DE BIOMEDICAL OPTICS; BIOSENSORS; FIBER OPTIC SENSORS; EVANESCENT WAVES ID IMMUNOASSAY AB To develop an improved fiber optic biosensor both the optical component selection and the signal coupling efficiency were investigated. The emission filter and fiber connectors were carefully chosen to reduce their contribution to noise in the system. We used long, fused silica fibers that had several centimeters of cladding removed along the distal end. This exposed core is coated with the recognition molecules that bind analyte-fluorophore complexes from the sample solution. A fluorescent signal generated in the evanescent wave region of the unclad, immersed portion of the probe is lost as it enters the cladded portion of the fiber because of a V-number mismatch. To minimize the mismatch, the core radius is reduced along the uncladded region to form a continuous taper. An assay using the tapered fiber and the described optical configuration is presented that demonstrates instantaneous signal generation in response to nanogram amounts of a toxic material. RP GOLDEN, JP (reprint author), USN,RES LAB,CTR BIOMOLEC SCI & ENGN,CODE 6090,4555 OVERLOOK AVE SW,WASHINGTON,DC 20375, USA. RI Anderson, George/D-2461-2011 OI Anderson, George/0000-0001-7545-9893 NR 18 TC 52 Z9 56 U1 0 U2 3 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 JUL PY 1992 VL 31 IS 7 BP 1458 EP 1462 DI 10.1117/12.58764 PG 5 WC Optics SC Optics GA JD558 UT WOS:A1992JD55800012 ER PT J AU CASSADY, CJ MCELVANY, SW AF CASSADY, CJ MCELVANY, SW TI GAS-PHASE REACTIONS OF MOLYBDENUM OXIDE IONS WITH SMALL HYDROCARBONS SO ORGANOMETALLICS LA English DT Article ID TRANSFORM MASS-SPECTROMETRY; TRANSITION-METAL HYDRIDES; BOND-DISSOCIATION ENERGIES; PHOTOCATALYTIC OXIDATION; OLEFIN METATHESIS; CLUSTER IONS; REACTIVITY; CATALYSTS; ALKANES; OXYGEN AB The gas-phase ion/molecule reactions of Mo+, MoO+, and MoO2+ with small alkanes, alkenes, and C6 hydrocarbons have been investigated using Fourier transform ion cyclotron resonance mass spectrometry. Product branching ratios and reaction rate constants are reported. Dehydrogenation dominates the reactions, with little cleavage of the strong Mo+-O and OMo+-O bonds. Aside from the production of MoO(CO)+ from MoO2+ and ethene, no evidence is found for the formation of oxygenated hydrocarbons, either as neutral reaction products or as ligands bound to Mo+. However, the reactions of Mo+, MoO+, and MoO2+ differ in terms of both rates and pathways. In contrast to the slow reaction rates of the d5 system Mo+, several MoO+ and MoO2+ reactions proceed at or near the collision rate. Variations are also seen in product ion distributions, and for MoO2+, unique reaction pathways involving dehydration and the elimination of small hydrocarbons occur. While Mo+ and MoO+ yield only products which are the result of C-H insertion, MoO2+ is capable of inserting into the C-C bonds of organic molecules. C1 USN,RES LAB,DIV CHEM,WASHINGTON,DC 20375. RP CASSADY, CJ (reprint author), MIAMI UNIV,DEPT CHEM,OXFORD,OH 45056, USA. RI Cassady, Carolyn/C-7865-2009 NR 76 TC 40 Z9 40 U1 0 U2 6 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0276-7333 J9 ORGANOMETALLICS JI Organometallics PD JUL PY 1992 VL 11 IS 7 BP 2367 EP 2377 DI 10.1021/om00043a017 PG 11 WC Chemistry, Inorganic & Nuclear; Chemistry, Organic SC Chemistry GA JD622 UT WOS:A1992JD62200017 ER PT J AU HAFTEL, MI MANDELZWEIG, VB AF HAFTEL, MI MANDELZWEIG, VB TI GRAPHICAL STUDIES OF 3-BODY WAVE-FUNCTIONS OBTAINED WITH THE CORRELATION-FUNCTION HYPERSPHERICAL-HARMONIC METHOD SO PHYSICAL REVIEW A LA English DT Article ID COUPLED EQUATIONS; MATRIX-ELEMENTS; STATES; EXPANSION AB Graphical representations of three-particle wave functions obtained by direct solution of the Schrodinger equation with the correlation-function hyperspherical-harmonic (CFHH) method are obtained and analyzed for ground and excited states of the helium atom and for the ground state of the mu-dd mesomolecular ion. The inclusion of adequate singular and cluster-correlation behavior is shown to be of crucial importance for a proper description of the wave function. In the CFHH method the wave function is a product of a correlation function and of a smooth factor expanded into hyperspherical-harmonic (HH) functions. While the HH expansion by itself is not able to reproduce a correct form of the wave function, the inclusion of the correlations results in its proper description even for low values of the maximal global momenta K(m). C1 MAX PLANCK INST NUCL PHYS,W-6900 HEIDELBERG 1,GERMANY. UNIV MARYLAND,DEPT PHYS & ASTRON,COLLEGE PK,MD 20742. HEBREW UNIV JERUSALEM,RACAH INST PHYS,IL-91904 JERUSALEM,ISRAEL. RP HAFTEL, MI (reprint author), USN,RES LAB,CODE 4651,WASHINGTON,DC 20375, USA. NR 24 TC 11 Z9 11 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1050-2947 J9 PHYS REV A JI Phys. Rev. A PD JUL 1 PY 1992 VL 46 IS 1 BP 142 EP 148 DI 10.1103/PhysRevA.46.142 PG 7 WC Optics; Physics, Atomic, Molecular & Chemical SC Optics; Physics GA JC558 UT WOS:A1992JC55800021 ER PT J AU QADRI, SB WEBB, AW SKELTON, EF MOULTON, N HU, JZ FURDYNA, JK AF QADRI, SB WEBB, AW SKELTON, EF MOULTON, N HU, JZ FURDYNA, JK TI PRESSURE-INDUCED STRUCTURAL AND RESISTIVE TRANSFORMATIONS OF (HG,FE)SE SO PHYSICAL REVIEW B LA English DT Article AB The pressure-induced transformations of (Hg,Fe)Se have been investigated with use of energy-dispersive x-ray diffraction with synchrotron radiation and resistivity measurements. The structural transformations are similar in nature to those of its parent compound HgSe. However, the transition pressure for the zinc-blende-to-cinnabar transformation was enhanced significantly while the transition pressure for the cinnabar-to-sodium-chloride transformation was reduced in comparison with those for HgSe. This trend in transition pressures is similar to other Hg chalcogenides and is different from other Fe- and/or Mn-based II-VI ternary alloys. C1 CARNEGIE INST WASHINGTON,GEOPHYS LAB,WASHINGTON,DC 20015. UNIV NOTRE DAME,DEPT PHYS,NOTRE DAME,IN 46556. RP QADRI, SB (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 13 TC 1 Z9 1 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 JUL 1 PY 1992 VL 46 IS 2 BP 639 EP 641 DI 10.1103/PhysRevB.46.639 PG 3 WC Physics, Condensed Matter SC Physics GA JC922 UT WOS:A1992JC92200005 ER PT J AU WEAVER, BD JACKSON, EM SUMMERS, GP BURKE, EA AF WEAVER, BD JACKSON, EM SUMMERS, GP BURKE, EA TI ATOMIC DISORDER AND THE TRANSITION-TEMPERATURE OF CUPRATE SUPERCONDUCTORS SO PHYSICAL REVIEW B LA English DT Article ID CA-CU-O; ION IRRADIATION; YBA2CU3O7-DELTA; FILMS; 60-K AB Particle-induced shifts in the transition temperature T(c) of cuprate superconductors are much larger than expected for the number of defects expected to be produced, and suggest that oxygen displacements in CuO2 planes are about an order of magnitude more effective in reducing T(c) than oxygen displacements in the intercalating layers. C1 UNIV MARYLAND,DEPT PHYS,CATONSVILLE,MD 21228. SPIRE CORP,BEDFORD,MA 01730. RP WEAVER, BD (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 22 TC 64 Z9 64 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 JUL 1 PY 1992 VL 46 IS 2 BP 1134 EP 1137 DI 10.1103/PhysRevB.46.1134 PG 4 WC Physics, Condensed Matter SC Physics GA JC922 UT WOS:A1992JC92200060 ER PT J AU QADRI, SB SKELTON, EF NAGUMO, M WEBB, AW LYNCH, FE MARMARO, RW AF QADRI, SB SKELTON, EF NAGUMO, M WEBB, AW LYNCH, FE MARMARO, RW TI PRESSURE AND TEMPERATURE-DEPENDENCE OF THE LATTICE-PARAMETERS OF TID1.94 SO PHYSICAL REVIEW B LA English DT Note ID KCL AB TiD1.94 crystallizes in a fcc lattice and at atmospheric pressure undergoes a transformation to a tetragonal phase at 17.5+/-0.5-degrees-C. Similarly it undergoes cubic-tetragonal phase transformation with a very small increase in pressure. The lattice parameters of TiD1.94 have been measured both as a function of the temperature and pressure. In the tetragonal phase, the a lattice parameter increases while the c parameter decreases with decreasing temperature. C1 HYDROGEN CONSULTANTS INC,LITTLETON,CO 80125. RP QADRI, SB (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 12 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 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD JUL 1 PY 1992 VL 46 IS 2 BP 1193 EP 1194 DI 10.1103/PhysRevB.46.1193 PG 2 WC Physics, Condensed Matter SC Physics GA JC922 UT WOS:A1992JC92200069 ER PT J AU RAJAGOPAL, AK AF RAJAGOPAL, AK TI SOLUTIONS OF THE MICROSCOPIC GORKOV EQUATIONS FOR A SUPERCONDUCTOR IN A STRONG QUANTIZING MAGNETIC-FIELD SO PHYSICAL REVIEW B LA English DT Note AB The microscopic Gorkov equations for the superconducting state of a system in a strong quantizing magnetic field are solved; these solutions extend the exact solutions of the corresponding linearized gap equation obtained recently by us. It is found that the orbit-center degeneracies of the quasiparticles imply strong correlations among many Landau states and these are incorporated in the solution presented. C1 JAWAHARLAL NEHRU CTR ADV SCI RES,BANGALORE 560012,INDIA. RP RAJAGOPAL, AK (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 6 TC 7 Z9 7 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 JUL 1 PY 1992 VL 46 IS 2 BP 1224 EP 1227 DI 10.1103/PhysRevB.46.1224 PG 4 WC Physics, Condensed Matter SC Physics GA JC922 UT WOS:A1992JC92200078 ER PT J AU ROMERO, H GANGULI, G LEE, YC PALMADESSO, PJ AF ROMERO, H GANGULI, G LEE, YC PALMADESSO, PJ TI ELECTRON-ION HYBRID INSTABILITIES DRIVEN BY VELOCITY SHEAR IN A MAGNETIZED PLASMA SO PHYSICS OF FLUIDS B-PLASMA PHYSICS LA English DT Article ID L-H TRANSITION; POLOIDAL ROTATION; TRANSVERSE; FIELD; TURBULENCE; SIMULATION; WAVES; GENERATION; PARALLEL; SHOCKS AB The stability of a magnetized plasma is investigated in which a sheared electron flow channel is present. The flow's peak velocity and shear scale length are denoted by V and L, respectively. If the velocity channel is perpendicular to the confining magnetic field and L less-than-or-equal-to rho(i) (rho(i) is the ion Larmor radius) an electrostatic instability develops whose frequency is on the order of the lower hybrid frequency. For V/(OMEGA(e)L) > 0.02 (OMEGA(e) denotes the electron cyclotron frequency), the peak growth rate is on the order of the lower hybrid frequency when k(parallel-to) = 0 (in here, k(parallel-to) is the wave number along the magnetic field). For V/(OMEGA(e)L) > 0.1 and k(parallel-to) = 0, the spectrum peaks when k(y)L approximately 1, where ky is the wave number in the direction of the flow velocity. For this mode it is shown that (i) a net cross-field current is not required for the onset of instability and (ii) the growth rate is not reduced by a velocity profile with no net flow (spatially averaged). Hence it is concluded that velocity shear is the only source of free energy. Further, it is shown that density gradients do not stabilize this mode. It follows that the mode presented in this work cannot be identified with the well-known modified two-stream instability. If the velocity channel is parallel to the confining magnetic field and the plasma is weakly magnetized, an instability driven by velocity shear is shown to exist, provided that V/(omega(pe)L) > 0.32, where omega(pe) is the electron plasma frequency. It is shown that a net plasma current is not required in order for this instability to be excited. C1 SCI APPLICAT INT CORP,MCLEAN,VA 22102. USN,RES LAB,SPECIAL PROJECT NONLINEAR SCI,WASHINGTON,DC 20375. UNIV MARYLAND,DEPT PHYS & ASTRON,COLLEGE PK,MD 20742. RP ROMERO, H (reprint author), USN,RES LAB,DIV PLASMA PHYS,SPACE PLASMA BRANCH,WASHINGTON,DC 20375, USA. NR 43 TC 37 Z9 37 U1 0 U2 5 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 JUL PY 1992 VL 4 IS 7 BP 1708 EP 1723 DI 10.1063/1.860028 PN 1 PG 16 WC Physics, Fluids & Plasmas SC Physics GA JB511 UT WOS:A1992JB51100004 ER PT J AU UHM, HS AF UHM, HS TI A THEORY OF RELATIVISTIC ELECTRON-BEAM BUNCHING BY THE PLASMA WAKE-FIELD EFFECTS SO PHYSICS OF FLUIDS B-PLASMA PHYSICS LA English DT Note AB Modulated current profile of a relativistic electron beam is theoretically investigated in terms of the propagation distance in a chamber containing a diffused plasma, which exerts wake-field effects on the beam. Neglecting the beam-head erosion, it is found that the beam current profile at a specified propagation distance is expressed in terms of only the time t0, at which the beam segment enters the chamber. Energy modulation along the beam pulse is also calculated. RP UHM, HS (reprint author), USN,CTR SURFACE WARFARE,10901 NEW HAMPSHIRE AVE,SILVER SPRING,MD 20903, USA. NR 7 TC 3 Z9 3 U1 0 U2 0 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0899-8221 J9 PHYS FLUIDS B-PLASMA PD JUL PY 1992 VL 4 IS 7 BP 2021 EP 2023 DI 10.1063/1.860009 PN 1 PG 3 WC Physics, Fluids & Plasmas SC Physics GA JB511 UT WOS:A1992JB51100034 ER PT J AU FRIEDMAN, A GROTE, DP HABER, I AF FRIEDMAN, A GROTE, DP HABER, I TI 3-DIMENSIONAL PARTICLE SIMULATION OF HEAVY-ION FUSION BEAMS SO PHYSICS OF FLUIDS B-PLASMA PHYSICS LA English DT Article; Proceedings Paper CT 33RD ANNUAL MEETING OF THE DIVISION OF PLASMA PHYSICS OF THE AMERICAN PHYSICAL SOC CY NOV 04-08, 1991 CL TAMPA, FL SP AMER PHYS SOC, DIV PLASMA PHYS AB The beams in a heavy-ion-beam-driven inertial fusion (HIF) accelerator are collisionless, nonneutral plasmas, confined by applied magnetic and electric fields. These space-charge-dominated beams must be focused onto small (few mm) spots at the fusion target, and so preservation of a small emittance is crucial. The nonlinear beam self-fields can lead to emittance growth, and so a self-consistent field description is needed. To this end, a multidimensional particle simulation code, WARP [Friedman et al., Part. Accel. 37-38, 131 (1992)], has been developed and is being used to study the transport of HIF beams. The code's three-dimensional (3-D) package combines features of an accelerator code and a particle-in-cell plasma simulation. Novel techniques allow it to follow beams through many accelerator elements over long distances and around bends. This paper first outlines the algorithms employed in WARP. A number of applications and corresponding results are then presented. These applications include studies of. beam drift-compression in a misaligned lattice of quadrupole focusing magnets; beam equilibria, and the approach to equilibrium; and the MBE-4 experiment [AIP Conference Proceedings 152 (AIP, New York, 1986), p. 145] recently concluded at Lawrence Berkeley Laboratory (LBL). Finally, 3-D simulations of bent-beam dynamics relevant to the planned Induction Linac Systems Experiments (ILSE) [Fessenden, Nucl. Instrum. Methods Plasma Res. A 278, 13 (1989)] at LBL are described. Axially cold beams are observed to exhibit little or no root-mean-square emittance growth at midpulse in transiting a (sharp) bend. Axially hot beams, in contrast, do exhibit some emittance growth. C1 USN,RES LAB,WASHINGTON,DC 20375. RP FRIEDMAN, A (reprint author), LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550, USA. NR 23 TC 100 Z9 99 U1 0 U2 4 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 JUL PY 1992 VL 4 IS 7 BP 2203 EP 2210 DI 10.1063/1.860024 PN 2 PG 8 WC Physics, Fluids & Plasmas SC Physics GA JB512 UT WOS:A1992JB51200022 ER PT J AU SPRANGLE, P ESAREY, E AF SPRANGLE, P ESAREY, E TI INTERACTION OF ULTRAHIGH LASER FIELDS WITH BEAMS AND PLASMAS SO PHYSICS OF FLUIDS B-PLASMA PHYSICS LA English DT Article; Proceedings Paper CT 33RD ANNUAL MEETING OF THE DIVISION OF PLASMA PHYSICS OF THE AMERICAN PHYSICAL SOC CY NOV 04-08, 1991 CL TAMPA, FL SP AMER PHYS SOC, DIV PLASMA PHYS ID CHIRPED-PULSE AMPLIFICATION; FREE-ELECTRON LASERS; ELECTROMAGNETIC-WAVES; HARMONIC-GENERATION; RARE-GASES; HIGH-POWER; ACCELERATOR; RADIATION; IONIZATION; SCATTERING AB The nonlinear interaction of ultraintense laser pulses with electron beams and plasmas is rich in a wide variety of new phenomena. Advances in laser science have made possible compact terawatt lasers capable of generating subpicosecond pulses at ultrahigh powers (greater-than-or-equal-to 1 TW) and intensities (greater-than-or-equal-to 10(18) W/cm2). These ultrahigh intensities result in highly relativistic nonlinear electron dynamics. This paper briefly addresses a number of phenomena including (i) laser excitation of large-amplitude plasma waves (wake fields), (ii) relativistic optical guiding of laser pulses in plasmas, (iii) optical guiding by preformed plasma channels, (iv) laser frequency amplification by ionization fronts and plasma waves, (v) relativistic harmonic generation, (vi) stimulated backscattering from plasmas and electron beams, (vii) nonlinear Thomson scattering from plasmas and electron beams, and (viii) cooling of electron beams by intense lasers. Potential applications of these effects are also discussed. RP SPRANGLE, P (reprint author), USN,RES LAB,DIV PLASMA PHYS,BEAM PHYS BRANCH,WASHINGTON,DC 20375, USA. NR 67 TC 150 Z9 155 U1 1 U2 6 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 JUL PY 1992 VL 4 IS 7 BP 2241 EP 2248 DI 10.1063/1.860192 PN 2 PG 8 WC Physics, Fluids & Plasmas SC Physics GA JB512 UT WOS:A1992JB51200027 ER PT J AU BERNHARDT, PA AF BERNHARDT, PA TI PROBING THE MAGNETOSPHERE USING CHEMICAL RELEASES FROM THE COMBINED RELEASE AND RADIATION EFFECTS SATELLITE SO PHYSICS OF FLUIDS B-PLASMA PHYSICS LA English DT Article; Proceedings Paper CT 33RD ANNUAL MEETING OF THE DIVISION OF PLASMA PHYSICS OF THE AMERICAN PHYSICAL SOC CY NOV 04-08, 1991 CL TAMPA, FL SP AMER PHYS SOC, DIV PLASMA PHYS ID RAYLEIGH-TAYLOR INSTABILITY; LARGE-LARMOR-RADIUS; BARIUM RELEASE; ION CLOUDS; INJECTION; STRIATIONS; IONOSPHERE; MOTION; LIMIT AB During the recent Combined Release and Radiation Effects Satellite (CRRES) mission, a series of chemical releases occurred in the magnetosphere and ionosphere to study a wide range of plasma processes. The experiments were designed to investigate (1) stimulated electron and ion precipitation, (2) ion transport in the magnetotail, (3) critical ionization velocity (CIV), (4) field line tracing and parallel acceleration, (5) diamagnetic cavity formation and collapse, and (6) plasma instabilities. The satellite orbit was highly elliptical having an apogee of 33 600 km and a perigee of 350 km. The range of altitudes permitted variations in background magnetic field strength and injection velocity. The release materials included barium, lithium, strontium, calcium, and europium. In situ diagnostics on board CRRES and ground-based optical instruments recorded the effects of the chemical releases. The CRRES experiments either (1) verified theoretical predictions, (2) showed new, unanticipated effects, or (3) presented none of the predicted phenomena. Examples of each category are illustrated by one of more of the CRRES chemical releases. RP BERNHARDT, PA (reprint author), USN,RES LAB,DIV PLASMA PHYS,SPACE PLASMA BRANCH,WASHINGTON,DC 20375, USA. NR 51 TC 48 Z9 48 U1 1 U2 2 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0899-8221 J9 PHYS FLUIDS B-PLASMA PD JUL PY 1992 VL 4 IS 7 BP 2249 EP 2256 DI 10.1063/1.860193 PN 2 PG 8 WC Physics, Fluids & Plasmas SC Physics GA JB512 UT WOS:A1992JB51200028 ER PT J AU COMMISSO, RJ GOODRICH, PJ GROSSMANN, JM HINSHELWOOD, DD OTTINGER, PF WEBER, BV AF COMMISSO, RJ GOODRICH, PJ GROSSMANN, JM HINSHELWOOD, DD OTTINGER, PF WEBER, BV TI CHARACTERIZATION OF A MICROSECOND-CONDUCTION-TIME PLASMA OPENING SWITCH SO PHYSICS OF FLUIDS B-PLASMA PHYSICS LA English DT Article; Proceedings Paper CT 33RD ANNUAL MEETING OF THE DIVISION OF PLASMA PHYSICS OF THE AMERICAN PHYSICAL SOC CY NOV 04-08, 1991 CL TAMPA, FL SP AMER PHYS SOC, DIV PLASMA PHYS ID MAGNETIC-FIELD PENETRATION; INDUCTIVE ENERGY-STORAGE; EROSION SWITCHES; ELECTRON FLOW; COMPRESSION; SIMULATION; GENERATION; OPERATION; DIODES AB This paper presents data and analyses from which emerges a physical picture of microsecond-conduction-time plasma opening switch operation. During conduction, a broad current channel penetrates axially through the plasma, moving it toward the load. Opening occurs when the current channel reaches the load end of the plasma, far from the load. During conduction, the axial line density in the interelectrode region is reduced from its value with no current conduction as a result of radial hydrodynamic forces associated with the current channel. A factor of 20 reduction is observed at opening in a small, localized region between the electrodes. When open, the switch plasma behaves like a section of magnetically insulated transmission line with an effective gap of 2 to 3 mm. Increasing the magnetic field in this gap by 50% results in an improvement of 50% in the peak load voltage and load current rise time, to 1.2 MV and 20 nsec, respectively. An erosion opening mechanism explains the inferred gap growth rate using the reduced line density at opening. Improved switch performance results when the maximum gap size is increased by using a rising load impedance. C1 JAYCOR INC,VIENNA,VA 22182. RP COMMISSO, RJ (reprint author), USN,RES LAB,DIV PLASMA PHYS,PULSED POWER PHYS BRANCH,WASHINGTON,DC 20375, USA. NR 70 TC 63 Z9 64 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 JUL PY 1992 VL 4 IS 7 BP 2368 EP 2376 DI 10.1063/1.860207 PN 2 PG 9 WC Physics, Fluids & Plasmas SC Physics GA JB512 UT WOS:A1992JB51200042 ER PT J AU LAPPERT, PW AF LAPPERT, PW TI HEALTH-CARE FOR AMERICANS SO PLASTIC AND RECONSTRUCTIVE SURGERY LA English DT Letter RP LAPPERT, PW (reprint author), USN HOSP,OAKLAND,CA 94627, USA. NR 1 TC 0 Z9 0 U1 0 U2 0 PU WILLIAMS & WILKINS PI BALTIMORE PA 351 WEST CAMDEN ST, BALTIMORE, MD 21201-2436 SN 0032-1052 J9 PLAST RECONSTR SURG JI Plast. Reconstr. Surg. PD JUL PY 1992 VL 90 IS 1 BP 141 EP 142 DI 10.1097/00006534-199207000-00040 PG 2 WC Surgery SC Surgery GA JB084 UT WOS:A1992JB08400032 PM 1615082 ER PT J AU NGAI, KL KANERT, O AF NGAI, KL KANERT, O TI COMPARISONS BETWEEN THE COUPLING MODEL PREDICTIONS, MONTE-CARLO SIMULATIONS AND SOME RECENT EXPERIMENTAL-DATA OF CONDUCTIVITY RELAXATIONS IN GLASSY IONICS SO SOLID STATE IONICS LA English DT Article ID DISPERSIVE DIFFUSION TRANSPORT; NON-DEBYE RELAXATION; ELECTRICAL RELAXATION; CORRELATED SYSTEMS; NEUTRON-SCATTERING; CONDUCTORS; NMR; EXPLANATION; MOTION AB Predictions of the coupling model proposed a decade ago for conductivity relaxations of glassy ionic conductors are shown to be in detailed agreement with recent Monte Carlo simulations. NMR spin lattice relaxation in poor ionic conductors including the alkali oxide glasses as well as quasi-elastic neutron scattering in fast ion conductors have confirmed the interpretation of the activation energies for ionic conductivity and the relations between them according to the coupling model. C1 UNIV DORTMUND, W-4600 DORTMUND 50, GERMANY. RP NGAI, KL (reprint author), USN, RES LAB, WASHINGTON, DC 20375 USA. NR 43 TC 69 Z9 69 U1 0 U2 8 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0167-2738 J9 SOLID STATE IONICS JI Solid State Ion. PD JUL-AUG PY 1992 VL 53 BP 936 EP 946 DI 10.1016/0167-2738(92)90275-T PN 2 PG 11 WC Chemistry, Physical; Physics, Condensed Matter SC Chemistry; Physics GA JP972 UT WOS:A1992JP97200032 ER PT J AU MORRIS, CE AF MORRIS, CE TI THE SCOTTISH CONTRIBUTION TO MODERN ECONOMIC-THOUGHT - MAIR,D SO SOUTHERN ECONOMIC JOURNAL LA English DT Book Review RP MORRIS, CE (reprint author), USN ACAD,ANNAPOLIS,MD 21402, USA. NR 1 TC 0 Z9 0 U1 0 U2 0 PU UNIV NORTH CAROLINA PI CHAPEL HILL PA SOUTHERN ECONOMIC JOURNAL, CHAPEL HILL, NC 27514 SN 0038-4038 J9 SOUTHERN ECON J JI South. Econ. J. PD JUL PY 1992 VL 59 IS 1 BP 133 EP 134 DI 10.2307/1060405 PG 2 WC Economics SC Business & Economics GA JD789 UT WOS:A1992JD78900029 ER PT J AU AMUNDSON, DE AF AMUNDSON, DE TI CAVITARY PULMONARY CRYPTOCOCCOSIS COMPLICATING CHURG-STRAUSS VASCULITIS SO SOUTHERN MEDICAL JOURNAL LA English DT Article ID FLUCONAZOLE; MENINGITIS AB Churg-Strauss vasculitis (CSV) is an interesting but uncommon pulmonary vasculitis. Cavitation in CSV is distinctly unusual and should prompt a work-up for other causes. We have described a case of CSV complicated by pulmonary cryptococcosis, which was treated with a novel antifungal regimen. C1 USN HOSP,DEPT CRIT CARE,SAN DIEGO,CA 92134. RP AMUNDSON, DE (reprint author), USN HOSP,DEPT CLIN INVEST,SAN DIEGO,CA 92134, USA. NR 11 TC 1 Z9 1 U1 0 U2 0 PU SOUTHERN MEDICAL ASSN PI BIRMINGHAM PA 35 LAKESHORE DR PO BOX 190088, BIRMINGHAM, AL 35219 SN 0038-4348 J9 SOUTHERN MED J JI South.Med.J. PD JUL PY 1992 VL 85 IS 7 BP 700 EP 702 PG 3 WC Medicine, General & Internal SC General & Internal Medicine GA JD786 UT WOS:A1992JD78600007 PM 1631681 ER PT J AU CODDINGTON, CC BRZYSKI, R HANSEN, KA CORLEY, DR MCINTYRESELTMAN, K JONES, HW AF CODDINGTON, CC BRZYSKI, R HANSEN, KA CORLEY, DR MCINTYRESELTMAN, K JONES, HW TI SHORT-TERM TREATMENT WITH LEUPROLIDE ACETATE IS A SUCCESSFUL ADJUNCT TO SURGICAL THERAPY OF LEIOMYOMAS OF THE UTERUS SO SURGERY GYNECOLOGY & OBSTETRICS LA English DT Article ID DENSITY LIPOPROTEIN CHOLESTEROL; UTERINE LEIOMYOMATA; HORMONE AGONIST; DEPOT; INFERTILITY; MYOMECTOMY; EFFICACY; TRIAL AB Gonadotropin releasing hormone analogs (GnRHa) have been used to induce a reduction in the size of leiomyomas of the uterus after three to six months of therapy. However, none of the studies have noted a significant decrease in size by the first month. Additionally, the results of two reports have suggested long term therapy with GnRHa induced significant aberrations of serum lipoproteins. To evaluate whether or not analog treatment for a short course (two months) would be efficacious, 27 patients with leiomyomas documented by examination of the pelvic area and vaginal ultrasound, who desired to preserve reproductive potential, had myomectomies two and one-half months after commencing depot leuprolide acetate therapy. The reduction in size of the uterus was 35 percent by the first month and the average reduction in the total volume was 44 percent after two months of treatment (474+/-364 to 265+/-173 milliliters, p<0.01). Furthermore, the size of the uterus, determined by examination, decreased significantly from 13.6+/-4.0 weeks initially to 10.1+/-3.0 weeks preoperatively (p<0.0001). Estradiol levels became menopausal by one month of therapy and remained suppressed preoperatively. Menopausal symptoms were well tolerated. Cholesterol, high density lipoprotein, extremely low density lipoprotein and glyceride levels were not altered by analog treatment, although low density lipoprotein increased from 117 to 130 milligrams per deciliter. A short course of depot leuprolide acetate reduced the size of leiomyomas and surgical tissue planes were preserved, facilitating removal of leiomyomas, and furthermore, there was no significant clinical alteration in lipoprotein or triglyceride levels. C1 USN HOSP,DEPT OBSTET & GYNECOL,PORTSMOUTH,VA. EASTERN VIRGINIA MED SCH,DEPT OBSTET & GYNECOL,JONES INST REPROD MED,NORFOLK,VA 23501. NR 29 TC 13 Z9 13 U1 0 U2 0 PU FRANKLIN H MARTIN FOUNDATION PI CHICAGO PA 55 E ERIE ST, CHICAGO, IL 60611 SN 0039-6087 J9 SURG GYNECOL OBSTET JI Surg. Gynecol. Obstet. PD JUL PY 1992 VL 175 IS 1 BP 57 EP 63 PG 7 WC Obstetrics & Gynecology; Surgery SC Obstetrics & Gynecology; Surgery GA JC448 UT WOS:A1992JC44800011 PM 1621201 ER PT J AU DICK, SJ AF DICK, SJ TI CENTRALIZING NAVIGATIONAL TECHNOLOGY IN AMERICA - THE UNITED-STATES NAVY DEPOT OF CHARTS AND INSTRUMENTS, 1830-1842 SO TECHNOLOGY AND CULTURE LA English DT Article RP DICK, SJ (reprint author), USN OBSERV,SCI,WASHINGTON,DC 20390, USA. NR 102 TC 5 Z9 5 U1 0 U2 0 PU UNIV CHICAGO PRESS PI CHICAGO PA 5720 S WOODLAWN AVE, CHICAGO, IL 60637 SN 0040-165X J9 TECHNOL CULT JI Technol. Cult. PD JUL PY 1992 VL 33 IS 3 BP 467 EP 509 DI 10.2307/3106634 PG 43 WC History & Philosophy Of Science SC History & Philosophy of Science GA JM310 UT WOS:A1992JM31000003 ER PT J AU ANDERSON, HG ETTLES, CM AF ANDERSON, HG ETTLES, CM TI CONTRAROTATING JOURNAL BEARINGS FOR NAVAL PROPULSION SYSTEM SO TRIBOLOGY TRANSACTIONS LA English DT Article AB Contrarotating propeller systems offer well-recognized advantages in propulsion efficiency. Unfortunately, circular bore journal bearings have no load capacity when used in contrarotation, but a quasi-squeeze effect may be induced by offset or preloaded sub arcs as these pass through the loaded region of the film. With this type of bearing, even when under steady load, the journal must orbit within the clearance space. The propagation of such orbits is described. The response is quantified by a Fourier analysis of the motion. Contrarotating journal bearings may be designed to support loads of the same general magnitude as conventional circular (non-rotating) bearings. C1 RENSSELAER POLYTECH INST,DEPT MECH ENGN,TROY,NY 12180. RP ANDERSON, HG (reprint author), USN,CTR NAVAL SURFACE WEAPONS,ANNAPOLIS DETACHMENT,ANNAPOLIS,MD 21402, USA. NR 6 TC 1 Z9 1 U1 6 U2 6 PU SOC TRIBOLOGISTS & LUBRICATION ENGINEERS PI PARK RIDGE PA 838 BUSSE HIGHWAY, PARK RIDGE, IL 60068 SN 0569-8197 J9 TRIBOL T JI Tribol. Trans. PD JUL PY 1992 VL 35 IS 3 BP 509 EP 515 DI 10.1080/10402009208982149 PG 7 WC Engineering, Mechanical SC Engineering GA JC073 UT WOS:A1992JC07300017 ER PT J AU SRINIVASAN, R MURPHY, JC PATTABIRAMAN, N AF SRINIVASAN, R MURPHY, JC PATTABIRAMAN, N TI STM OBSERVATIONS OF 2-DIMENSIONAL CONDENSED LAYERS ON SOLID ELECTRODES SO ULTRAMICROSCOPY LA English DT Article; Proceedings Paper CT 6TH INTERNATIONAL CONF ON SCANNING TUNNELING MICROSCOPY ( STM 91 ) CY AUG 12-16, 1991 CL INTERLAKEN, SWITZERLAND SP BOARD SWISS FED INST TECHNOL, DAIMLER BENZ FONDS, IBM RES DIV, ZURICH RES LAB, IBM SWITZERLAND, SWISS NATL SCI FDN, CIBA GEIGY, HOFFMANN LA ROCHE, LONZA, SANDOZ, FDN ERNST & LUCIE SCHMIDHEINY ID MERCURY WATER INTERFACE; GRAPHITE AB Two-dimensional condensed monolayers formed electrochemically on highly oriented pyrolitic graphite (HOPG) have been imaged using STM techniques. The formation Process involves electrochemical adsorption followed by a phase transition to the condensed state which is controlled by the electrode potential. The resulting layered structures are well ordered and free of defects. In this work, the electrochemistry of condensed layers is briefly reviewed from a thermodynamic perspective. Recent STM studies are discussed and shown to confirm some of the earlier conclusions about condensed monolayer structures. It is also shown that the structure and the composition of a single phase of a condensed layer change, with electrode potential and the composition of the electrolyte for the cases of adenine and guanine on HOPG. Possible applications in the formation of structured films for nanotechnology are discussed. C1 GEOCENTERS INC,FT WASHINGTON,MD 20774. USN,RES LAB,WASHINGTON,DC 20375. RP SRINIVASAN, R (reprint author), JOHNS HOPKINS UNIV,APPL PHYS LAB,LAUREL,MD 20723, USA. NR 22 TC 29 Z9 29 U1 1 U2 3 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0304-3991 J9 ULTRAMICROSCOPY JI Ultramicroscopy PD JUL PY 1992 VL 42 BP 453 EP 459 DI 10.1016/0304-3991(92)90306-5 PN A PG 7 WC Microscopy SC Microscopy GA JL737 UT WOS:A1992JL73700070 ER PT J AU GLEMBOCKI, OJ SNOW, ES MARRIAN, CRK PROKES, SM KATZER, DS AF GLEMBOCKI, OJ SNOW, ES MARRIAN, CRK PROKES, SM KATZER, DS TI NANOSCALE PHOTOVOLTAIC IMAGING USING THE SCANNING TUNNELING MICROSCOPE SO ULTRAMICROSCOPY LA English DT Article; Proceedings Paper CT 6TH INTERNATIONAL CONF ON SCANNING TUNNELING MICROSCOPY ( STM 91 ) CY AUG 12-16, 1991 CL INTERLAKEN, SWITZERLAND SP BOARD SWISS FED INST TECHNOL, DAIMLER BENZ FONDS, IBM RES DIV, ZURICH RES LAB, IBM SWITZERLAND, SWISS NATL SCI FDN, CIBA GEIGY, HOFFMANN LA ROCHE, LONZA, SANDOZ, FDN ERNST & LUCIE SCHMIDHEINY AB Optical interactions in scanning tunneling microscopy (STM) have been considered. It is shown that when STM is used as a proximal probe of photovoltages it is possible to obtain local information about the physical properties of the subsurface semiconducting material. We find that photovoltaic STM measurements allow us to detect relative changes in bulk properties such as band gap and doping density, on a nanometer scale. These results show that the combination of STM and surface photovoltage are capable of providing not only valuable information about the surface of a material, but also about its bulk properties. RP GLEMBOCKI, OJ (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. RI Katzer, D. Scott/N-7841-2013 NR 12 TC 14 Z9 14 U1 0 U2 2 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0304-3991 J9 ULTRAMICROSCOPY JI Ultramicroscopy PD JUL PY 1992 VL 42 BP 764 EP 770 DI 10.1016/0304-3991(92)90355-N PN A PG 7 WC Microscopy SC Microscopy GA JL737 UT WOS:A1992JL73700119 ER PT J AU MARRIAN, CRK DOBISZ, EA AF MARRIAN, CRK DOBISZ, EA TI HIGH-RESOLUTION LITHOGRAPHY WITH A VACUUM STM SO ULTRAMICROSCOPY LA English DT Article ID SCANNING TUNNELING MICROSCOPE; ELECTRON-BEAM LITHOGRAPHY; POLYDIACETYLENE NEGATIVE RESIST; 50 KV; EXPOSURE AB The scanning tunneling microscope (STM) is demonstrated to be a useful low-energy e-beam lithographic tool and a valuable probe of resist materials. Lithography with a vacuum STM and a 10 nm 50 kV e-beam has been performed on identically prepared and processed films of a state-of-the-art high-resolution negative resist (SAL-601 from Shipley). On bulk substrates (Si and GaAs), resist films up to 50 nm thick have been patterned, developed and observed in a scanning electron microscope. A resist thickness of 50 nm is sufficient to withstand a reactive ion etch. On Si, the minimum feature size observed with the 50 kV e-beam was 95 nm. In contrast, the STM lithography defined features observed in the developed resist to have linewidths down to 23 nm. The variation of feature size with exposure dose, exposure voltage and resist thickness has been studied. The STM lithography has shown that SAL-601 is inherently capable of sub 25 nm resolution and that low voltage e-beam lithography can produce smaller minimum feature sizes than lithography with a 10 nm 50 kV e-beam. RP MARRIAN, CRK (reprint author), USN,RES LAB,DIV ELECTR SCI & TECHNOL,CODE 6864,WASHINGTON,DC 20375, USA. NR 17 TC 15 Z9 15 U1 0 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0304-3991 J9 ULTRAMICROSCOPY JI Ultramicroscopy PD JUL PY 1992 VL 42 BP 1309 EP 1316 DI 10.1016/0304-3991(92)90440-U PN B PG 8 WC Microscopy SC Microscopy GA JM423 UT WOS:A1992JM42300055 ER PT J AU DELSANTO, PP WHITCOMBE, T CHASKELIS, HH MIGNOGNA, RB AF DELSANTO, PP WHITCOMBE, T CHASKELIS, HH MIGNOGNA, RB TI CONNECTION MACHINE SIMULATION OF ULTRASONIC WAVE-PROPAGATION IN MATERIALS .1. THE ONE-DIMENSIONAL CASE SO WAVE MOTION LA English DT Article ID ABSORBING BOUNDARY-CONDITIONS; FINITE-DIFFERENCE METHOD; HETEROGENEOUS MEDIA; SEISMOGRAMS; EQUATION AB The rapidly increasing availability of new and more efficient computational tools suggests that urgent attention be devoted to the consideration of their capabilities, so as to take full advantage of their implementation. In this paper we present an approach that is designed to take advantage of the communication and parallel processing features of the Connection Machine. Our goal is to develop an efficient simulation procedure for the study of ultrasonic wave propagation in a material specimen of arbitrary complexity. The method can, however, also be applied to other problems of wave propagation. In our approach the material specimen is assumed to consist of many "cells," which are in one-to-one correspondence with the processors of the Connection Machine. The "rules" governing the wave propagation in the material are "taught" to each processor via an iteration equation, permitting simulation of the physical phenomena in a very natural way. Arbitrary source pulses can be input and followed in their propagation through the material. Reflection, refraction, absorption and mode conversion effects are automatically obtained, without having to impose boundary conditions at the interfaces between different layers. The present paper is restricted to one-dimensional propagation, i.e., to the case of a uniform waveform propagating through a material plate, normal to its surface. In a subsequent paper the treatment will be extended to two and three dimensions. C1 USN, RES LAB, MECH MAT BRANCH, WASHINGTON, DC 20375 USA. RP DELSANTO, PP (reprint author), POLITECN TORINO, DIPARTIMENTO FIS, I-10129 TURIN, ITALY. NR 46 TC 89 Z9 91 U1 0 U2 6 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0165-2125 J9 WAVE MOTION JI Wave Motion PD JUL PY 1992 VL 16 IS 1 BP 65 EP 80 DI 10.1016/0165-2125(92)90047-6 PG 16 WC Acoustics; Mechanics; Physics, Multidisciplinary SC Acoustics; Mechanics; Physics GA JD515 UT WOS:A1992JD51500005 ER PT J AU BLANK, DA AF BLANK, DA TI A CODING ERROR ELIMINATION PROCEDURE FOR VALIDATING ISOTROPIC TURBULENT CONVECTION NUMERICAL-CALCULATIONS IN AXISYMMETRICAL FLOWS WITH EULERIAN AND LAGRANGIAN DESCRIPTIONS SO INTERNATIONAL JOURNAL FOR NUMERICAL METHODS IN FLUIDS LA English DT Article DE ERROR ELIMINATION; DEBUGGING; COMBINED EULERIAN-LAGRANGIAN DESCRIPTION; FLUID FLOW; TURBULENT FLOW; CONVECTIVE HEAT TRANSFER; COMPUTATIONAL METHODS; NUMERICAL METHODS; NUMERICAL HEAT TRANSFER ID BARRIER-PISTON ENGINES; HEAT-TRANSFER MODEL; 4-STROKE AB A procedure which ensures the elimination of discretization and coding errors in the numerical solution of a set of governing equations describing internal turbulent convection flows is given and illustrated. The governing equations investigated in the validation analysis are of general form. The equations for the turbulence model (k-epsilon) assume the turbulence to be isotropic. In the analysis a portion of the solution region uses a Lagrangian description while a Eulerian description is used elsewhere. The work was originally motivated by the need to validate numerical calculations performed in the modelling of combusting fluid flow within symmetric piston engines. Thus the procedure is demonstrated for an axisymmetric formulation. The same methodology can be even more easily applied to Cartesian-based problems using the guidelines given in this work. Details of the procedure are presented in a very practical format, making it possible to consider both simpler and more complex governing equation sets with little additional effort. Thus the implementation of this procedure by researchers to a variety of both turbulent and laminar internal flow problems should prove to be easy. RP BLANK, DA (reprint author), USN ACAD,DEPT MECH ENGN,ANNAPOLIS,MD 21402, USA. NR 9 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 0271-2091 J9 INT J NUMER METH FL JI Int. J. Numer. Methods Fluids PD JUN 30 PY 1992 VL 14 IS 12 BP 1421 EP 1436 DI 10.1002/fld.1650141205 PG 16 WC Computer Science, Interdisciplinary Applications; Mathematics, Interdisciplinary Applications; Mechanics; Physics, Fluids & Plasmas SC Computer Science; Mathematics; Mechanics; Physics GA JD431 UT WOS:A1992JD43100003 ER PT J AU PROKES, SM FREITAS, JA SEARSON, PC AF PROKES, SM FREITAS, JA SEARSON, PC TI MICROLUMINESCENCE DEPTH PROFILES AND ANNEALING EFFECTS IN POROUS SILICON SO APPLIED PHYSICS LETTERS LA English DT Article AB Cross-sectional microluminescence measurements for 1-OMEGA-cm 70-mu-m porous silicon samples show a continuous decrease of the photoluminescence band as a function of sample depth. No spectral shift is observed. For samples annealed at 390-degrees-C, in addition to spectral intensity reduction, we observe the same redshift in all luminescence spectra independent of depth. A study of this luminescence redshift as a function of annealing temperature reveals a striking similarity to results observed for optical band gap shrinking of a-Si:H as a function of hydrogen loss during annealing. C1 SACHS FREEMAN ASSOCIATES INC,LANDOVER,MD 20785. JOHNS HOPKINS UNIV,BALTIMORE,MD 21218. RP PROKES, SM (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. RI Searson, Peter /A-3311-2010; OI Searson, Peter/0000-0002-5417-0828 NR 11 TC 76 Z9 82 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 JUN 29 PY 1992 VL 60 IS 26 BP 3295 EP 3297 DI 10.1063/1.106724 PG 3 WC Physics, Applied SC Physics GA JA806 UT WOS:A1992JA80600032 ER PT J AU CAMPBELL, ML MCCLEAN, RE GARLAND, NL NELSON, HH AF CAMPBELL, ML MCCLEAN, RE GARLAND, NL NELSON, HH TI ELECTRONIC QUENCHING OF THE B2-SIGMA+ STATE OF ALO SO CHEMICAL PHYSICS LETTERS LA English DT Article ID RATE CONSTANTS; ENERGY-TRANSFER; GAS-PHASE; TEMPERATURE; FLUORESCENCE AB Electronic quenching rate constants for the B2-SIGMA+ state of AlO were determined using a pulsed-laser photolysis laser-induced fluorescence technique by examining fluorescence decay rates in the presence of seven atomic and molecular collision partners. The two polar molecules CO and NO were found to have rate constants of 4.8 x 10(-12) and 1.8 x 10(-10) cm3 s-1, respectively. The nonpolar gases He, H2, N2, CO2 and Xe were found to be poor quenchers with a bimolecular quenching rate constant having an upper bound of 1 X 10(-13) cm3 s-1 for He, H-2, N2 and Xe and 1 x 10(-12) cm3 for CO2. C1 USN,RES LAB,DIV CHEM,WASHINGTON,DC 20375. RP CAMPBELL, ML (reprint author), USN ACAD,DEPT CHEM,ANNAPOLIS,MD 21402, USA. NR 20 TC 8 Z9 8 U1 0 U2 9 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0009-2614 J9 CHEM PHYS LETT JI Chem. Phys. Lett. PD JUN 26 PY 1992 VL 194 IS 3 BP 187 EP 190 DI 10.1016/0009-2614(92)85532-F PG 4 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA JB820 UT WOS:A1992JB82000009 ER PT J AU CHOU, PT MARTINEZ, ML COOPER, WC MCMORROW, D COLLINS, ST KASHA, M AF CHOU, PT MARTINEZ, ML COOPER, WC MCMORROW, D COLLINS, ST KASHA, M TI MONOHYDRATE CATALYSIS OF EXCITED-STATE DOUBLE-PROTON TRANSFER IN 7-AZAINDOLE SO JOURNAL OF PHYSICAL CHEMISTRY LA English DT Letter ID DYNAMICS; ALCOHOL; TAUTOMERIZATION; COMPLEXES; ETHANOL; WATER AB The green fluorescence (530 nm) of 7-azaindole tautomer is shown to be observable at room temperature upon microaddition of water (0.008 M to saturation) to ethyl ether and to p-dioxane (0. 1 7-1.7 M) as solvent. The fluorescence of 7-azaindole observed in liquid water solution (lambda(max) approximately 38 5 nm) is thus shown to correspond to the normal molecule (fluorescence at approximately 350 nm in ether), contrary to current proposals suggesting that this latter fluorescence corresponds to the tautomer. The present experiments indicate that 7-azaindole monohydrate undergoes excited-state double-proton transfer. The results also suggest that 7-azaindole polyhydrate, which is expected to be prevalent in water solvent, inhibits the solvent rearrangement that is necessary for tautomerization, resulting in a diminished tautomer fluorescence intensity. C1 USN,RES LAB,WASHINGTON,DC 20375. FLORIDA STATE UNIV,DEPT CHEM,TALLAHASSEE,FL 32306. FLORIDA STATE UNIV,INST MOLEC BIOPHYS,TALLAHASSEE,FL 32306. RP CHOU, PT (reprint author), UNIV S CAROLINA,DEPT CHEM,COLUMBIA,SC 29208, USA. OI CHOU, PITAI/0000-0002-8925-7747 NR 15 TC 122 Z9 122 U1 0 U2 7 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0022-3654 J9 J PHYS CHEM-US JI J. Phys. Chem. PD JUN 25 PY 1992 VL 96 IS 13 BP 5203 EP 5205 DI 10.1021/j100192a002 PG 3 WC Chemistry, Physical SC Chemistry GA JB264 UT WOS:A1992JB26400002 ER PT J AU ROSS, MM NELSON, HH CALLAHAN, JH MCELVANY, SW AF ROSS, MM NELSON, HH CALLAHAN, JH MCELVANY, SW TI PRODUCTION AND CHARACTERIZATION OF METALLOFULLERENES SO JOURNAL OF PHYSICAL CHEMISTRY LA English DT Letter ID SPHEROIDAL CARBON SHELLS; COMPLEXES; C-60 AB Negative ion/desorption chemical ionization mass spectrometry was used to characterize fullerenes with an encapsulated metal atom(s), metallofullerenes (M(x) @ C(n)), in arc-generated soot, pyridine extracts, and the extract residue. In agreement with results from other laboratories, the pyridine extracts of La2O3/graphite soot contain mostly La @ C82 and La2 @ C80, in addition to the "pure" (empty) fullerenes. However, the raw soot and the extract residue contain a broader range of metallofullerenes with relative abundances different from those observed from the extract (e.g., abundant La @ C60, La @ C70, and La @ C74). Arcing mixed-metal oxide-impregnated graphite rods yielded a mixed-metal dimetallofullerene (YLa @ C80) and higher relative abundances of metallofullerenes with the lower ionization potential metal atom. The thermal desorption behavior and solubility in different solvents of the doped and undoped fullerenes indicate an interaction between the C(n) and La(x) @ C(n) species. Finally, analysis of aqueous solutions of dried pyridine extracts of lanthana/graphite soot shows C(n) and La(x) @ C(n), which is consistent with the possible presence of metallofullerene/fullerene ionic complexes, (Lax @ Cn)+Cn-. RP ROSS, MM (reprint author), USN,RES LAB,DIV CHEM,CODE 6110,WASHINGTON,DC 20375, USA. NR 17 TC 87 Z9 87 U1 1 U2 17 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 JUN 25 PY 1992 VL 96 IS 13 BP 5231 EP 5234 DI 10.1021/j100192a012 PG 4 WC Chemistry, Physical SC Chemistry GA JB264 UT WOS:A1992JB26400012 ER PT J AU RUSSELL, TP MILLER, PJ PIERMARINI, GJ BLOCK, S AF RUSSELL, TP MILLER, PJ PIERMARINI, GJ BLOCK, S TI HIGH-PRESSURE PHASE-TRANSITION IN GAMMA-HEXANITROHEXAAZAISOWURTZITANE SO JOURNAL OF PHYSICAL CHEMISTRY LA English DT Article ID CELL AB A high-pressure phase transition in gamma-hexanitrohexaazaisowurtzitane (HNIW) has been described at 0.7 +/- 0.05 GPa and room temperature. The new high-pressure Polymorph, zeta-HNIW, was observed in a diamond anvil high-pressure cell with (1) Fourier transform infrared spectroscopy (FTIR), (2) energy-dispersive X-ray powder diffraction (EDXD), and (3) polarized light microscopy. The gamma-zeta transformation is rapid and reversible in single crystals in a hydrostatic pressure transmitting medium (1:1 n-pentane:isopentane) and can be detected by a sharp, well-defined change in birefringence with polarized light. MR spectra and EDXD data have been obtained for both the zeta and gamma-phases as a function of pressure. The new high-pressure zeta-polymorph could not be retrieved to ambient conditions. C1 NATL INST STAND & TECHNOL,MAT SCI & ENGN LAB,GAITHERSBURG,MD 20899. RP RUSSELL, TP (reprint author), USN,CTR SURF WARFARE,WHITE OAK,MD 20903, USA. NR 10 TC 41 Z9 46 U1 1 U2 8 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 JUN 25 PY 1992 VL 96 IS 13 BP 5509 EP 5512 DI 10.1021/j100192a060 PG 4 WC Chemistry, Physical SC Chemistry GA JB264 UT WOS:A1992JB26400060 ER PT J AU SHAPIRO, MM SILBERBERG, R TSAO, CH AF SHAPIRO, MM SILBERBERG, R TSAO, CH TI ISOTOPES IN THE COSMIC-RAYS SO ANNALS OF THE NEW YORK ACADEMY OF SCIENCES LA English DT Article ID BALLOON MEASUREMENT; BE-10 ABUNDANCE; SILICON; NUCLEI; AGE; ACCELERATION; CHARGE; NICKEL C1 UNIV MARYLAND,DEPT PHYS,COLL PK,MD 20742. UNIV SPACE RES ASSOC,WASHINGTON,DC 20024. USN,RES LAB,EO HULBURT CTR SPACE RES,WASHINGTON,DC 20375. NR 71 TC 1 Z9 1 U1 0 U2 0 PU NEW YORK ACAD SCIENCES PI NEW YORK PA 2 E 63RD ST, NEW YORK, NY 10021 SN 0077-8923 J9 ANN NY ACAD SCI JI Ann. N.Y. Acad. Sci. PD JUN 23 PY 1992 VL 655 BP 138 EP 159 DI 10.1111/j.1749-6632.1992.tb17069.x PG 22 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA JQ045 UT WOS:A1992JQ04500018 ER PT J AU KURFESS, JD AF KURFESS, JD TI GAMMA-RAY ASTROPHYSICS - DEVELOPMENT AND FUTURE-PROSPECTS SO ANNALS OF THE NEW YORK ACADEMY OF SCIENCES LA English DT Article ID ANNIHILATION RADIATION; CENTAURUS X-3; LINE EMISSION; REGION; HEAO-3; UHURU RP KURFESS, JD (reprint author), USN,RES LAB,EO HULBURT CTR SPACE RES,WASHINGTON,DC 20375, USA. NR 51 TC 0 Z9 0 U1 0 U2 0 PU NEW YORK ACAD SCIENCES PI NEW YORK PA 2 E 63RD ST, NEW YORK, NY 10021 SN 0077-8923 J9 ANN NY ACAD SCI JI Ann. N.Y. Acad. Sci. PD JUN 23 PY 1992 VL 655 BP 292 EP 308 DI 10.1111/j.1749-6632.1992.tb17078.x PG 17 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA JQ045 UT WOS:A1992JQ04500027 ER PT J AU SNAIL, KA MARKS, CM AF SNAIL, KA MARKS, CM TI INSITU DIAMOND GROWTH-RATE MEASUREMENT USING EMISSION INTERFEROMETRY SO APPLIED PHYSICS LETTERS LA English DT Article ID FILMS AB The growth rate of diamond synthesized in an oxygen-acetylene flame has been measured in situ with an infrared pyrometer. During the growth, the sample's emitted radiation intensity is modulated in time by interference phenomena in the growing diamond film, causing a periodic variation of the pyrometer's apparent temperature reading. Diamond film growth rates determined from the period of these oscillations agree well with rates derived from the film thickness. This technique is used to determine the variation of diamond growth rate with substrate temperature over the range of 444-1200-degrees-C. An Arrhenius analysis of the data shows two distinct diamond growth regimes. RP SNAIL, KA (reprint author), USN,RES LAB,DIV OPT SCI,CODE 6522,WASHINGTON,DC 20375, USA. NR 20 TC 52 Z9 52 U1 0 U2 3 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0003-6951 J9 APPL PHYS LETT JI Appl. Phys. Lett. PD JUN 22 PY 1992 VL 60 IS 25 BP 3135 EP 3137 DI 10.1063/1.106747 PG 3 WC Physics, Applied SC Physics GA HZ537 UT WOS:A1992HZ53700019 ER PT J AU HO, T WYNNE, KJ AF HO, T WYNNE, KJ TI A NEW FLUORINATED POLYURETHANE - POLYMERIZATION, CHARACTERIZATION, AND MECHANICAL-PROPERTIES SO MACROMOLECULES LA English DT Article ID SEGMENTED POLYURETHANE; THERMAL-ANALYSIS; ELASTOMERS; TETRAFLUOROETHYLENE; COPOLYMERS; POLYMERS AB A fluorinated polyurethane based on the ethylene-fluoroalkyl-ethylene diol 3-(trifluoromethyl)3, 4,4,5,5,6,6,7,7,8,8-undecafluoro-1,10-decanediol, HO(CH2)2(CF2)4(CF2CFCF3)(CH2)2OH (including 5% 4-trifluoromethyl isomer), and 1,6-hexamethylene diisocyanate, OCN(CH2)6NCO, was prepared. The kinetics of polymerization was studied using Fourier transform infrared spectroscopy. The resulting polyurethane was characterized by viscometry, differential scanning calorimetry (DSC), and gel permeation chromatography. Correlations among the glass transition temperature, intrinsic viscosity, and molecular weight were established. Interestingly, multiple exotherms appeared in the DSC data, the areas and positions of which were time-dependent. The appearance of ordered domains in the solid state correlated with the decreased ratio of the "free" to "bound" C=O stretching frequencies in the infrared spectra. The effect of this apparent crystallization on mechanical properties was evaluated via stress-strain and dynamic mechanical testing. C1 US OFF NAVAL RES,DIV CHEM,ARLINGTON,VA 22217. GEORGE MASON UNIV,DEPT CHEM,FAIRFAX,VA 22030. RP HO, T (reprint author), USN,RES LAB,MAT CHEM BRANCH,CODE 6120,WASHINGTON,DC 20375, USA. NR 29 TC 45 Z9 46 U1 1 U2 11 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0024-9297 J9 MACROMOLECULES JI Macromolecules PD JUN 22 PY 1992 VL 25 IS 13 BP 3521 EP 3527 DI 10.1021/ma00039a033 PG 7 WC Polymer Science SC Polymer Science GA JA603 UT WOS:A1992JA60300033 ER PT J AU CAWLEY, R HSU, GH AF CAWLEY, R HSU, GH TI SNR PERFORMANCE OF A NOISE-REDUCTION ALGORITHM APPLIED TO COARSELY SAMPLED CHAOTIC DATA SO PHYSICS LETTERS A LA English DT Article ID TIME-SERIES; DIMENSIONS; SYSTEMS AB We describe results of application to coarsely sampled Lorenz time series of an algorithm for noise reduction. The method does not depend on having detailed prior information about system dynamics. Systematic numerical studies reveal linear growth in peak values of maximum SNR improvement with the logarithm of trajectory length. C1 UNIV MISSOURI,DEPT MATH,COLUMBIA,MO 65211. RP CAWLEY, R (reprint author), USN,CTR SURFACE WARFARE,MATH & INFORMAT SCI BRANCH,SILVER SPRING,MD 20903, USA. NR 21 TC 25 Z9 25 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 JUN 22 PY 1992 VL 166 IS 3-4 BP 188 EP 196 DI 10.1016/0375-9601(92)90360-X PG 9 WC Physics, Multidisciplinary SC Physics GA JC240 UT WOS:A1992JC24000007 ER PT J AU VOSS, KJ SCHOONMAKER, JS AF VOSS, KJ SCHOONMAKER, JS TI TEMPERATURE-DEPENDENCE OF BEAM SCATTERING IN YOUNG SEA ICE SO APPLIED OPTICS LA English DT Note DE SEA ICE; LIGHT SCATTERING AB Laboratory measurements of the upward intensity distribution in young thin sea ice illustrate the variation of this distribution and peak intensity with growth temperature and ice thickness. C1 USN,CTR OCEAN SYST,SAN DIEGO,CA 92152. RP VOSS, KJ (reprint author), UNIV MIAMI,DEPT PHYS,CORAL GABLES,FL 33124, USA. RI Voss, Kenneth /A-5328-2013 OI Voss, Kenneth /0000-0002-7860-5080 NR 3 TC 5 Z9 5 U1 0 U2 0 PU OPTICAL SOC AMER PI WASHINGTON PA 2010 MASSACHUSETTS AVE NW, WASHINGTON, DC 20036 SN 0003-6935 J9 APPL OPTICS JI Appl. Optics PD JUN 20 PY 1992 VL 31 IS 18 BP 3388 EP 3389 PG 2 WC Optics SC Optics GA HY065 UT WOS:A1992HY06500007 PM 20725297 ER PT J AU WIDING, KG FELDMAN, U AF WIDING, KG FELDMAN, U TI ELEMENT ABUNDANCES AND PLASMA PROPERTIES IN A CORONAL POLAR PLUME SO ASTROPHYSICAL JOURNAL LA English DT Article DE SUN, ABUNDANCES; SUN, CORONA; ULTRAVIOLET, SOLAR SYSTEM ID PHOTOSPHERIC ABUNDANCES; SOLAR ABUNDANCES; FLARE; ATMOSPHERE; SPECTRA; OXYGEN; NEON AB Element abundances have been determined in a coronal polar plume previously observed to have a low Ne/Mg abundance ratio associated with an open magnetic field. This study is based on images of the plume in Ne VI, VII, Mg VI-VIII, Na VIII, and Ca IX, X photographed between 300 and 600 angstrom by the NRL spectroheliograph on Skylab. The density variation with height derived from Mg VIII 436.7 angstrom is satisfactorily fitted with a temperature of 843,000 K in hydrostatic equilibrium, close to the temperature expected in ionization equilibrium. It is also consistent with a small departure from hydrostatic equilibrium and outflow velocities in the range of 10-20 km s-1. The electron density derived from the Mg VIII doublet ratio is 1 x 10(9) cm-3. Hydrostatic temperatures derived from intensity-height gradients in plume images of other ions also correlate with the temperatures expected in ionization equilibrium. Element abundances relative to magnesium at several altitudes were derived by combining plots of the ion differential emission measures. We find that the relative abundances of Na, Mg, and Ca in the plume are the same (within a factor of 2) as those in the photosphere, whereas the abundance of neon relative to magnesium is only 1/10 of this ratio in the photosphere. This is an extreme case of the composition bias present on a global scale in the corona and solar wind in which elements with a high first ionization potential (FIP), such as neon and oxygen, are less abundant relative to elements with low FIP (Mg, Si, Ca) than in the photosphere. RP WIDING, KG (reprint author), USN,RES LAB,EO HULBURT CTR SPACE RES,WASHINGTON,DC 20375, USA. NR 26 TC 74 Z9 75 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 JUN 20 PY 1992 VL 392 IS 2 BP 715 EP 721 DI 10.1086/171474 PN 1 PG 7 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA HY145 UT WOS:A1992HY14500038 ER PT J AU HOLLAND, DL CHEN, J AF HOLLAND, DL CHEN, J TI ON CHAOTIC CONDUCTIVITY IN THE MAGNETOTAIL SO GEOPHYSICAL RESEARCH LETTERS LA English DT Article ID PARTICLE DYNAMICS; GEOMAGNETIC TAIL; ORBITS; FIELD; SHEET AB The concept of chaotic conductivity and the acceleration of particles due to a constant dawn dusk electric field are studied in a magnetotail-like magnetic field. A test particle simulation is used including the full nonlinear dynamics. It is found that the acceleration process can be understood without invoking chaos and that the cross tail current is determined by the particle dynamics and distributions. We conclude that in general there is no simple relationship between the electric field and the current, i.e. J not-equal sigma . E. RP HOLLAND, DL (reprint author), USN,RES LAB,DIV PLASMA PHYS,BEAM PHYS BRANCH,CODE 4792,WASHINGTON,DC 20375, USA. NR 16 TC 16 Z9 16 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 JUN 19 PY 1992 VL 19 IS 12 BP 1231 EP 1234 DI 10.1029/92GL01121 PG 4 WC Geosciences, Multidisciplinary SC Geology GA JA744 UT WOS:A1992JA74400014 ER PT J AU ROLISON, DR THIEL, PA STACY, AM RICHMOND, GL RICE, JK PEMBERTON, JE OSTERYOUNG, JG OGRADY, WE NOWAK, RJ LICHTER, RL AF ROLISON, DR THIEL, PA STACY, AM RICHMOND, GL RICE, JK PEMBERTON, JE OSTERYOUNG, JG OGRADY, WE NOWAK, RJ LICHTER, RL TI WOMEN IN SCIENCE - RESPONSE SO SCIENCE LA English DT Letter C1 IOWA STATE UNIV SCI & TECHNOL,AMES LAB,AMES,IA 50011. IOWA STATE UNIV SCI & TECHNOL,DEPT CHEM,AMES,IA 50011. UNIV CALIF BERKELEY,DEPT CHEM,BERKELEY,CA 94720. UNIV OREGON,DEPT CHEM,EUGENE,OR 97403. UNIV OREGON,INST CHEM PHYS,EUGENE,OR 97403. USN,CHEM DYNAM & DIAGNOST BRANCH,WASHINGTON,DC 20375. UNIV ARIZONA,DEPT CHEM,TUCSON,AZ 85721. N CAROLINA STATE UNIV,DEPT CHEM,RALEIGH,NC 27695. OFF NAVAL RES,DIV CHEM,ARLINGTON,VA 22217. CAMILLE & HENRY DREYFUS FDN,NEW YORK,NY 10022. RP ROLISON, DR (reprint author), USN,RES LAB,SURFACE CHEM BRANCH,CODE 6170,WASHINGTON,DC 20375, USA. NR 1 TC 0 Z9 0 U1 1 U2 2 PU AMER ASSOC ADVANCEMENT SCIENCE PI WASHINGTON PA 1200 NEW YORK AVE, NW, WASHINGTON, DC 20005 SN 0036-8075 J9 SCIENCE JI Science PD JUN 19 PY 1992 VL 256 IS 5064 BP 1614 EP 1615 DI 10.1126/science.256.5064.1614-e PG 2 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA HZ174 UT WOS:A1992HZ17400017 PM 17841068 ER PT J AU KERSEY, AD BERKOFF, TA AF KERSEY, AD BERKOFF, TA TI DUAL WAVELENGTH FIBER INTERFEROMETER WITH WAVELENGTH SELECTION VIA FIBER BRAGG GRATING ELEMENTS SO ELECTRONICS LETTERS LA English DT Article DE INTERFEROMETERS; OPTICAL FIBERS; OPTICAL SENSORS AB The use of intra-core fibre gratings to provide the selection of two stable, closely spaced wavelength-components at the output of a fibre interferometer is reported. An unambiguous sensing range in the optical path difference of an interferometer of +/- 0.49 mm is demonstrated using two gratings spaced by 2.5 nm. C1 SFA INC,LANDOVER,MD 20785. RP KERSEY, AD (reprint author), USN,RES LAB,DIV OPT SCI,CODE 6574,WASHINGTON,DC 20375, USA. NR 8 TC 21 Z9 24 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 JUN 18 PY 1992 VL 28 IS 13 BP 1215 EP 1216 DI 10.1049/el:19920767 PG 2 WC Engineering, Electrical & Electronic SC Engineering GA JB734 UT WOS:A1992JB73400022 ER PT J AU HAVLICEK, JP KATZ, GR MCKEEMAN, JC AF HAVLICEK, JP KATZ, GR MCKEEMAN, JC TI EVEN LENGTH MEDIAN FILTERS IN OPTIMAL SIGNAL-PROCESSING SO ELECTRONICS LETTERS LA English DT Article DE FILTERS; SIGNAL PROCESSING AB Examples are presented where the even-length median filter offers improved mean squared error characteristics over the odd-length median. This indicates that even-length filters should be considered in optimal filter design. In terms of the mean absolute error criterion, it is shown that the even-length median filter admits a representation as a generalised stack filter. C1 USN,RES LAB,WASHINGTON,DC 20375. IBM CORP,DIV FEDERAL SECTOR,MANASSAS,VA 22110. RP HAVLICEK, JP (reprint author), UNIV TEXAS,DEPT ELECT & COMP ENGN,AUSTIN,TX 78712, USA. NR 9 TC 1 Z9 1 U1 0 U2 1 PU IEE-INST ELEC ENG PI HERTFORD PA MICHAEL FARADAY HOUSE SIX HILLS WAY STEVENAGE, HERTFORD, ENGLAND SG1 2AY SN 0013-5194 J9 ELECTRON LETT JI Electron. Lett. PD JUN 18 PY 1992 VL 28 IS 13 BP 1258 EP 1260 DI 10.1049/el:19920795 PG 3 WC Engineering, Electrical & Electronic SC Engineering GA JB734 UT WOS:A1992JB73400050 ER PT J AU TURNER, NH SCHREIFELS, JA AF TURNER, NH SCHREIFELS, JA TI SURFACE-ANALYSIS - X-RAY PHOTOELECTRON-SPECTROSCOPY AND AUGER-ELECTRON SPECTROSCOPY SO ANALYTICAL CHEMISTRY LA English DT Review ID CHEMICAL-STATE PLOTS; MEAN FREE-PATH; COPPER PHTHALOCYANINE TETRASULFONATE; SPECTROMETER TRANSMISSION FUNCTION; PRINCIPAL COMPONENT ANALYSIS; PLATE GENERATED MICROPROBE; CONTACT-ANGLE HYSTERESIS; BINDING-ENERGY REFERENCE; TECHNICAL WORKING PARTY; FREE MULTILAYER SYSTEMS C1 GEORGE MASON UNIV, DEPT CHEM, FAIRFAX, VA 22030 USA. GEOCENTERS INC, FT WASHINGTON, MD 20744 USA. RP TURNER, NH (reprint author), USN, RES LAB, DIV CHEM, WASHINGTON, DC 20375 USA. NR 497 TC 9 Z9 9 U1 4 U2 7 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0003-2700 J9 ANAL CHEM JI Anal. Chem. PD JUN 15 PY 1992 VL 64 IS 12 BP R302 EP R320 PG 19 WC Chemistry, Analytical SC Chemistry GA HZ518 UT WOS:A1992HZ51800017 ER PT J AU ZVANUT, ME STAHLBUSH, RE CARLOS, WE AF ZVANUT, ME STAHLBUSH, RE CARLOS, WE TI RADIATION-INDUCED E' CENTERS IN H-2-ANNEALED OXIDE-FILMS SO APPLIED PHYSICS LETTERS LA English DT Article ID DEPOSITED SILICON DIOXIDE; INTERFACE STATES; SIO2; MODEL AB In oxides fabricated by thermal oxidation or ion implantation, an order-of-magnitude increase is observed in the concentration of radiation-induced E' centers when the oxide is first exposed to H-2 at temperatures greater than 600-degrees-C. To the authors' knowledge, we report the first data indicating that preirradiation hydrogen annealing of thermal oxides causes a large increase in the concentration of radiation-induced E' centers. We discuss evidence suggesting that the hydrogen anneal creates a new E' precursor, Si-H, from Si-Si bonds. RP ZVANUT, ME (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 23 TC 14 Z9 14 U1 0 U2 2 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0003-6951 J9 APPL PHYS LETT JI Appl. Phys. Lett. PD JUN 15 PY 1992 VL 60 IS 24 BP 2989 EP 2991 DI 10.1063/1.106785 PG 3 WC Physics, Applied SC Physics GA HY988 UT WOS:A1992HY98800014 ER PT J AU LYNCH, JW LINOILLA, I SAUSVILLE, EA STEINBERG, SM GHOSH, BC NGUYEN, DT SCHECHTER, GP FISCHMANN, AB IHDE, DC STOCKER, JL BASTIAN, A TURNER, R COTELINGAM, JD GAZDAR, AF FOSS, FM AF LYNCH, JW LINOILLA, I SAUSVILLE, EA STEINBERG, SM GHOSH, BC NGUYEN, DT SCHECHTER, GP FISCHMANN, AB IHDE, DC STOCKER, JL BASTIAN, A TURNER, R COTELINGAM, JD GAZDAR, AF FOSS, FM TI PROGNOSTIC IMPLICATIONS OF EVALUATION FOR LYMPH-NODE INVOLVEMENT BY T-CELL ANTIGEN RECEPTOR GENE REARRANGEMENT IN MYCOSIS-FUNGOIDES SO BLOOD LA English DT Article ID ACUTE LYMPHOBLASTIC-LEUKEMIA; SEZARY SYNDROME; MARKERS; CHAIN C1 USN HOSP,NCI,MED ONCOL BRANCH,BLDG 8,RM 5101,BETHESDA,MD 20814. UNIFORMED SERV UNIV HLTH SCI,BETHESDA,MD 20814. VET AFFAIRS MED CTR,WASHINGTON,DC. GEORGE WASHINGTON UNIV,WASHINGTON,DC 20052. NR 22 TC 31 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 0006-4971 J9 BLOOD JI Blood PD JUN 15 PY 1992 VL 79 IS 12 BP 3293 EP 3299 PG 7 WC Hematology SC Hematology GA HY946 UT WOS:A1992HY94600024 PM 1596570 ER PT J AU KAUR, G VIALLET, J LABORDA, J BLAIR, O GAZDAR, AF MINNA, JD SAUSVILLE, EA AF KAUR, G VIALLET, J LABORDA, J BLAIR, O GAZDAR, AF MINNA, JD SAUSVILLE, EA TI GROWTH-INHIBITION BY CHOLERA-TOXIN OF HUMAN LUNG-CARCINOMA CELL-LINES - CORRELATION WITH GM1 GANGLIOSIDE EXPRESSION SO CANCER RESEARCH LA English DT Article ID DEPENDENT PROTEIN-KINASE; L-DOPA DECARBOXYLASE; BACTERIAL TOXINS; CANCER; DIFFERENTIATION; CHROMOGRANIN; ACTIVATION; ENDOCRINE; CALCIUM; MARKERS AB The effect of cholera toxin (CT) on the growth of 12 small cell lung carcinoma (SCLC) and 15 non-small cell lung carcinoma (NSCLC) cell lines is presented. CT inhibited the growth of nine SCLC cell lines (concentration for 50% inhibition of growth, 27-700 ng/ml), all of which had abundant expression of G(M1) ganglioside, the surface receptor for CT. CT-resistant SCLC all had greatly decreased G(M1) expression. In contrast, CT inhibited the growth of only four of 15 NSCLC cell lines. Seven of the 11 CT-resistant NSCLC had levels of G(M1) comparable to CT-sensitive NSCLC or SCLC. In a limited panel of cell lines, cyclic AMP (cAMP) agonists including forskolin, 8Br[cAMP], and dibutyryl[cAMP] did not consistently reproduce CT-mediated inhibition of cell growth, nor did these compounds overcome resistance of cells to the growth inhibitory effects of CT. Expression of the R(I) and R(II) regulatory subunits of cAMP-dependent protein kinase was similar in CT-resistant and CT-sensitive SCLC or NSCLC cell lines. In the presence of isobutylmethylxanthine, intracellular cAMP levels induced by CT in a CT-resistant, G(M1)(+) NSCLC cell line were comparable to those achieved in a CT-sensitive NSCLC cell line. We conclude that inhibition of lung carcinoma cell growth by CT in all cases requires expression of G(M1), and in the case of SCLC cell lines the presence of G(M1) is sufficient. In NSCLC cell lines, expression of G(M1) is not sufficient for growth inhibition by CT. These findings imply refractoriness to growth inhibition by cAMP in G(M1)(+), CT-resistant NSCLC cell lines and the possibility of non-cAMP-related mechanisms for growth inhibition in CT-sensitive cell lines. C1 NCI,BIOL CHEM LAB,USN,MED ONCOL BRANCH,BLDG 37,RM 5D02,9000 ROCKVILLE PIKE,BETHESDA,MD 20892. GEORGETOWN UNIV,MED CTR,VINCENT T LOMBARDI CANC RES CTR,WASHINGTON,DC 20007. RI Laborda, Jorge/L-5726-2014 OI Laborda, Jorge/0000-0002-9210-838X NR 28 TC 17 Z9 17 U1 0 U2 0 PU AMER ASSOC CANCER RESEARCH PI PHILADELPHIA PA PUBLIC LEDGER BLDG, SUITE 816, 150 S. INDEPENDENCE MALL W., PHILADELPHIA, PA 19106 SN 0008-5472 J9 CANCER RES JI Cancer Res. PD JUN 15 PY 1992 VL 52 IS 12 BP 3340 EP 3346 PG 7 WC Oncology SC Oncology GA HY054 UT WOS:A1992HY05400015 PM 1375868 ER PT J AU NEE, TW AF NEE, TW TI ANISOTROPIC OPTICAL-PROPERTIES OF YBA2CU3O7 SO JOURNAL OF APPLIED PHYSICS LA English DT Article ID BA-CU-O; SUPERCONDUCTING ENERGY-GAP; ELECTRONIC-STRUCTURE; SINGLE-CRYSTALS; REFLECTIVITY; SPECTROSCOPY; SPECTRA AB Based upon the published results of YBa2Cu3O7 single-crystal reflectance spectra measured at room temperature, the empirical anisotropic spectral density functions and quasidielectric functions epsilon-1j+i-epsilon-2j [j=a,b,c] are determined in the 0.05 to 6 eV spectral range. These functions are an excellent fit to the reflectance spectra of samples in single-crystal, twin-crystal, and polycrystalline forms; they agree well with the published anisotropic transport and ellipsometry data. For polarizations along the a and b axes, the numerically determined empirical spectral density functions have shown two interband absorption peaks at 2.5 and 5 eV. For energy above 3 eV, the spectral density functions do not agree with the published theoretical interband conductivities that are derived from the band structure calculations. RP NEE, TW (reprint author), USN,DEPT RES,DIV AIR WARFARE CTR WEAPONS,CHINA LAKE,CA 93555, USA. NR 22 TC 4 Z9 4 U1 0 U2 0 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0021-8979 J9 J APPL PHYS JI J. Appl. Phys. PD JUN 15 PY 1992 VL 71 IS 12 BP 6002 EP 6007 DI 10.1063/1.350454 PG 6 WC Physics, Applied SC Physics GA HZ316 UT WOS:A1992HZ31600039 ER PT J AU PICKETT, WE PEDERSON, MR JACKSON, KA ERWIN, SC AF PICKETT, WE PEDERSON, MR JACKSON, KA ERWIN, SC TI THEORETICAL ELECTRONIC-STRUCTURE STUDIES OF DIAMOND - SURFACES, ADSORBATES, DEFECTS AND HETEROINTERFACES SO MATERIALS SCIENCE AND ENGINEERING B-SOLID STATE MATERIALS FOR ADVANCED TECHNOLOGY LA English DT Article ID IMPURITY AB The implementation of self-consistent electronic structure calculations has made a large impact in the past decade on our understanding of the origins of the properties of materials. In this paper we briefly review several applications and a few of the recent calculational results of our group for the material properties of diamond: defects, diamond-metal interfaces and chemical processes occurring at diamond surfaces. C1 CENT MICHIGAN UNIV,DEPT PHYS,MT PLEASANT,MI 48859. UNIV PENN,DEPT PHYS,PHILADELPHIA,PA 19104. RP PICKETT, WE (reprint author), USN,RES LAB,COMPLEX SYST THEORY BRANCH,CODE 4690,WASHINGTON,DC 20375, USA. RI Erwin, Steven/B-1850-2009 NR 11 TC 16 Z9 16 U1 0 U2 2 PU ELSEVIER SCIENCE SA LAUSANNE PI LAUSANNE 1 PA PO BOX 564, 1001 LAUSANNE 1, SWITZERLAND SN 0921-5107 J9 MAT SCI ENG B-SOLID JI Mater. Sci. Eng. B-Solid State Mater. Adv. Technol. PD JUN 15 PY 1992 VL 14 IS 1 BP 87 EP 92 DI 10.1016/0921-5107(92)90334-6 PG 6 WC Materials Science, Multidisciplinary; Physics, Condensed Matter SC Materials Science; Physics GA JD040 UT WOS:A1992JD04000016 ER PT J AU HAFIZI, B SPRANGLE, P SERAFIM, P AF HAFIZI, B SPRANGLE, P SERAFIM, P TI NONLINEAR-ANALYSIS OF A GRATING FREE-ELECTRON LASER SO PHYSICAL REVIEW A LA English DT Article AB A two-dimensional nonlinear model of a grating free-electron laser is formulated that includes the effects of self-field forces, finite beam emittance, energy spread, and gyromotion of electrons in a guide magnetic field. The start-oscillation current and enregy spread requirement for operation at either 100 or 10-mu-m are determined. The designs call for an electron beam of moderate energy (< 1 MV). The extraction efficiency is determined by numerical simulation. Three different examples are studied in order to elucidate the nonlinear stage of the interaction. We analyze the examples of an infinitely thin beam, a finite-thickness beam with laminar flow, and a finite-thickness beam with full transverse motion. For a thick beam we find the interesting result that the effect of electron gyration about the beam axis is to enhance the extraction efficiency as compared to that for a beam with laminar flow. The numerical results for the extraction efficiency are found to be in close agreement with analytical estimates based on a model in which the electrons are trapped in the slow wave associated with the grating structure. C1 ICARUS RES, BETHESDA, MD 20814 USA. NORTHEASTERN UNIV, BOSTON, MA 02115 USA. RP USN, RES LAB, DIV PLASMA PHYS, BEAM PHYS BRANCH, WASHINGTON, DC 20375 USA. NR 24 TC 21 Z9 21 U1 0 U2 0 PU AMER PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 2469-9926 EI 2469-9934 J9 PHYS REV A JI Phys. Rev. A PD JUN 15 PY 1992 VL 45 IS 12 BP 8846 EP 8853 DI 10.1103/PhysRevA.45.8846 PG 8 WC Optics; Physics, Atomic, Molecular & Chemical SC Optics; Physics GA JA214 UT WOS:A1992JA21400065 ER PT J AU JONES, RS SLOTWINSKI, JA AF JONES, RS SLOTWINSKI, JA TI STRUCTURAL AND ELASTIC PROPERTIES OF TRANSITION-METAL SUPERLATTICES SO PHYSICAL REVIEW B LA English DT Article ID EMBEDDED-ATOM-METHOD; THIN-FILMS; GRAIN-BOUNDARIES; MECHANICAL-PROPERTIES; CU; CONSTANTS; MODULUS; COPPER; MULTILAYERS; FOILS AB We have calculated the equilibrium geometries and elastic properties of transition-metal superlattices (Cu-Ni, Cu-Pd, and Cu-Au) over a range of composition modulation wavelengths for both slab-layered systems (with alternating equal-width slabs of the constituents) and for systems with a sinusoidally modulated composition. The energies and equilibrium geometries were obtained with the embedded-atom method and the elastic constants were determined both by considering appropriate sums over the dynamical matrix and by calculating the energy of specific deformations of the unit cell. No enhancements of the elastic constants or moduli were found for any of the systems considered, in agreement with recent experimental results. C1 USN,RES LAB,DEPT CHEM,WASHINGTON,DC 20375. RP JONES, RS (reprint author), LOYOLA COLL,DEPT PHYS,BALTIMORE,MD 20210, USA. OI Mintmire, John/0000-0002-6551-0349 NR 35 TC 18 Z9 18 U1 0 U2 4 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD JUN 15 PY 1992 VL 45 IS 23 BP 13624 EP 13630 DI 10.1103/PhysRevB.45.13624 PG 7 WC Physics, Condensed Matter SC Physics GA HZ245 UT WOS:A1992HZ24500055 ER PT J AU PROKES, SM GLEMBOCKI, OJ BERMUDEZ, VM KAPLAN, R FRIEDERSDORF, LE SEARSON, PC AF PROKES, SM GLEMBOCKI, OJ BERMUDEZ, VM KAPLAN, R FRIEDERSDORF, LE SEARSON, PC TI SIHX EXCITATION - AN ALTERNATE MECHANISM FOR POROUS SI PHOTOLUMINESCENCE SO PHYSICAL REVIEW B LA English DT Note ID HYDROGENATED SILICON AB We show that low-temperature (230-390-degrees-C) desorption of hydrogen from 0.1-OMEGA-cm p-type porous Si structures leads to a redshift and gradual disappearance of the photoluminescence (PL). Furthermore, no blueshifting of the PL peaks is apparent with pore-widening treatments. These results are consistent with a luminescence mechanism from hydride species formed during the etching process. Based on this model, the PL intensity is expected to be most affected by total surface area of the porous silicon and the PL peak position by the hydride complex distribution. C1 JOHNS HOPKINS UNIV,BALTIMORE,MD 21218. RP PROKES, SM (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. RI Searson, Peter /A-3311-2010; OI Searson, Peter/0000-0002-5417-0828 NR 20 TC 316 Z9 323 U1 0 U2 3 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD JUN 15 PY 1992 VL 45 IS 23 BP 13788 EP 13791 DI 10.1103/PhysRevB.45.13788 PG 4 WC Physics, Condensed Matter SC Physics GA HZ245 UT WOS:A1992HZ24500088 ER PT J AU HAFIZI, B ROBERSON, CW AF HAFIZI, B ROBERSON, CW TI EFFECT OF EMITTANCE AND ENERGY SPREAD ON A FREE-ELECTRON LASER IN THE GAIN-FOCUSING REGIME SO PHYSICAL REVIEW LETTERS LA English DT Article ID BEAM QUALITY; FEL AB A free-electron laser operating in the gain-focusing regime is discussed. The variation of growth rate, radius of curvature of wave fronts, filling factor, and efficiency with emittance and energy spread is derived. The results, which are based on the Vlasov-Maxwell system of equations, are obtained by minimizing a variational functional. When plotted as a function of emittance, the efficiency at maximum growth rate peaks at a nonzero value of emittance. For small values of energy spread, the efficiency at maximum growth rate increases with energy spread, in contrast to intuitive expectations. C1 OFF NAVAL RES,DIV PHYS,ARLINGTON,VA 22217. RP HAFIZI, B (reprint author), USN,RES LAB,BEAM PHYS BRANCH,WASHINGTON,DC 20375, USA. NR 22 TC 14 Z9 14 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0031-9007 J9 PHYS REV LETT JI Phys. Rev. Lett. PD JUN 15 PY 1992 VL 68 IS 24 BP 3539 EP 3542 DI 10.1103/PhysRevLett.68.3539 PG 4 WC Physics, Multidisciplinary SC Physics GA HY943 UT WOS:A1992HY94300014 ER PT J AU HINSHELWOOD, D WEBER, B GROSSMANN, JM COMMISSO, RJ AF HINSHELWOOD, D WEBER, B GROSSMANN, JM COMMISSO, RJ TI DENSITY REDISTRIBUTION IN A MICROSECOND-CONDUCTION-TIME PLASMA OPENING SWITCH SO PHYSICAL REVIEW LETTERS LA English DT Article ID STORAGE AB The first measurements of the line-integrated electron density in a coaxial microsecond-conduction-time plasma opening switch during switch operation are presented. Current conduction is observed to cause a radial redistribution of the switch plasma. with a large decrease in axial line density over most of the radial extent of the switch. A local reduction in line density of more than an order of magnitude occurs by the time opening begins. It is hypothesized that this density reduction allows the switch to open by an erosion mechanism. Initial numerical modeling efforts have reproduced the principal observed results. RP HINSHELWOOD, D (reprint author), USN,RES LAB,DIV PLASMA PHYS,WASHINGTON,DC 20375, USA. NR 15 TC 53 Z9 55 U1 0 U2 3 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0031-9007 J9 PHYS REV LETT JI Phys. Rev. Lett. PD JUN 15 PY 1992 VL 68 IS 24 BP 3567 EP 3570 DI 10.1103/PhysRevLett.68.3567 PG 4 WC Physics, Multidisciplinary SC Physics GA HY943 UT WOS:A1992HY94300021 ER PT J AU HAGAN, KJ AF HAGAN, KJ TI 100 DAYS - THE MEMOIRS OF THE FALKLANDS BATTLE-GROUP COMMANDER - WOODWARD,S, ROBINSON,P SO NEW YORK TIMES BOOK REVIEW LA English DT Book Review RP HAGAN, KJ (reprint author), USN ACAD,MUSEUM,ANNAPOLIS,MD 21402, USA. NR 1 TC 0 Z9 0 U1 0 U2 0 PU NEW YORK TIMES PI NEW YORK PA 229 W 43RD ST, NEW YORK, NY 10036-3959 SN 0028-7806 J9 NEW YORK TIMES BK R JI N. Y. Times Book Rev. PD JUN 14 PY 1992 BP 22 EP 22 PG 1 WC Humanities, Multidisciplinary SC Arts & Humanities - Other Topics GA HX630 UT WOS:A1992HX63000027 ER PT J AU MOWREY, RC ROSS, MM CALLAHAN, JH AF MOWREY, RC ROSS, MM CALLAHAN, JH TI MOLECULAR-DYNAMICS SIMULATIONS AND EXPERIMENTAL STUDIES OF THE FORMATION OF ENDOHEDRAL COMPLEXES OF BUCKMINSTERFULLERENE SO JOURNAL OF PHYSICAL CHEMISTRY LA English DT Article ID COLLISION-INDUCED DECOMPOSITION; SPHEROIDAL CARBON SHELLS; MULTIATOMIC IONS; ENERGY-TRANSFER; C-60; DISSOCIATION; FILMS; FORM; C-70 AB The formation of endohedral C60He+ complexes in mass spectrometric experiments in which C60+ collides with He at kiloelectronvolt energies has been modeled with molecular dynamics simulations. Experimental results have shown that the collision energy at which the greatest abundance of C60He+ is observed is 5000 eV, while molecular dynamics simulations predict that optimal complex formation should occur in 8000-eV collisions. When the effects of the experimentally observed unimolecular decomposition of the internally excited C60He+ complex are considered, however, there is relatively good agreement between the predictions of the simulations and the experimental results. The simulations provide a detailed picture of the trapping process and show that low-energy collisions with low impact parameters and high-energy collisions with high impact parameters are most likely to result in formation of C60He+. The molecular dynamics simulations also provide insight into inelastic scattering processes observed in the mass spectrometric experiments; the results are consistent with an impulsive collision in which momentum transfer occurs between He and an isolated portion of C60+, as predicted by the simulations. RP MOWREY, RC (reprint author), USN,RES LAB,DIV CHEM,WASHINGTON,DC 20375, USA. NR 46 TC 70 Z9 72 U1 0 U2 3 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0022-3654 J9 J PHYS CHEM-US JI J. Phys. Chem. PD JUN 11 PY 1992 VL 96 IS 12 BP 4755 EP 4761 DI 10.1021/j100191a008 PG 7 WC Chemistry, Physical SC Chemistry GA HY322 UT WOS:A1992HY32200008 ER PT J AU MCELVANY, SW AF MCELVANY, SW TI PRODUCTION OF ENDOHEDRAL YTTRIUM FULLERENE CATIONS BY DIRECT LASER VAPORIZATION SO JOURNAL OF PHYSICAL CHEMISTRY LA English DT Article ID SPHEROIDAL CARBON SHELLS; CLUSTER IONS; COMPLEXES; ABLATION AB Direct laser vaporization of samples containing graphite, yttrium oxide, and fullerenes is used to generate gas-phase yttrium-fullerene adduct ions, Y(x)C(n)+ (x = 1, 2 with even-numbered n = 60-100), in a Fourier transform ion cyclotron resonance mass spectrometer. Collision-induced dissociation and oxidation reactions are used to compare these species with externally-bound adducts, Y(C(n))+, generated by gas-phase association reactions. The stability toward fragmentation and the remarkable oxidative stability suggest that the laser-generated species have endohedral structures, Y(x) @ C(n)+. Possible mechanisms are considered for the production of these endohedral metal-containing fullerene cations. RP MCELVANY, SW (reprint author), USN,RES LAB,DIV CHEM,CODE 6113,WASHINGTON,DC 20375, USA. NR 24 TC 69 Z9 69 U1 0 U2 7 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0022-3654 J9 J PHYS CHEM-US JI J. Phys. Chem. PD JUN 11 PY 1992 VL 96 IS 12 BP 4935 EP 4937 DI 10.1021/j100191a039 PG 3 WC Chemistry, Physical SC Chemistry GA HY322 UT WOS:A1992HY32200039 ER PT J AU REYES, RM CORDA, AJ AF REYES, RM CORDA, AJ TI CYLINDRICAL OPTICAL BACKPLANE SO APPLIED OPTICS LA English DT Note DE ELECTROOPTIC; BACKPLANE; PARALLEL INTERCONNECT AB A cylindrical optical backplane using Plexiglas stacked disks, light-emitting diodes, and p-i-n photodiodes is described. The main advantage of the design is its simplicity and lack of both precision optics and critical alignment requirements. RP REYES, RM (reprint author), USN,CTR SURFACE WEAP,CODE N32,DAHLGREN,VA 22448, USA. NR 5 TC 0 Z9 0 U1 0 U2 0 PU OPTICAL SOC AMER PI WASHINGTON PA 2010 MASSACHUSETTS AVE NW, WASHINGTON, DC 20036 SN 0003-6935 J9 APPL OPTICS JI Appl. Optics PD JUN 10 PY 1992 VL 31 IS 17 BP 3208 EP 3210 PG 3 WC Optics SC Optics GA HX467 UT WOS:A1992HX46700008 PM 20725270 ER PT J AU SZU, H SHENG, YL CHEN, J AF SZU, H SHENG, YL CHEN, J TI WAVELET TRANSFORM AS A BANK OF THE MATCHED-FILTERS SO APPLIED OPTICS LA English DT Article DE WAVELET TRANSFORM; GABOR TRANSFORM; AMBIGUITY FUNCTION; WIGNER DISTRIBUTION; OPTICAL WAVELET TRANSFORM ID SIGNALS AB The wavelet transform is a powerful tool for the analysis of short transient signals. We detail the advantages of the wavelet transform over the Fourier transform and the windowed Fourier transform and consider the wavelet as a bank of the VanderLugt matched filters. This methodology is particularly useful in those cases in which the shape of the mother wavelet is approximately known a priori. A two-dimensional optical correlator with a bank of the wavelet filters is implemented to yield the time-frequency joint representation of the wavelet transform of one-dimensional signals. C1 UNIV LAVAL,DEPT PHYS,CTR OPT PHOTON & LASER,QUEBEC CITY G1K 7P4,QUEBEC,CANADA. RP SZU, H (reprint author), USN,CTR SURFACE WARFARE,INFORMAT SCI GRP,CODE R44,19001 NEW HAMPSHIRE AVE,SILVER SPRING,MD 20903, USA. NR 20 TC 122 Z9 126 U1 1 U2 10 PU OPTICAL SOC AMER PI WASHINGTON PA 2010 MASSACHUSETTS AVE NW, WASHINGTON, DC 20036 SN 0003-6935 J9 APPL OPTICS JI Appl. Optics PD JUN 10 PY 1992 VL 31 IS 17 BP 3267 EP 3277 PG 11 WC Optics SC Optics GA HX467 UT WOS:A1992HX46700016 PM 20725278 ER PT J AU KOUVELIOTOU, C NORRIS, JP WOOD, KS CLINE, TL DENNIS, BR DESAI, UD ORWIG, LE AF KOUVELIOTOU, C NORRIS, JP WOOD, KS CLINE, TL DENNIS, BR DESAI, UD ORWIG, LE TI SEARCH FOR SOFT GAMMA-REPEATERS IN THE SMM HXRBS DATA SO ASTROPHYSICAL JOURNAL LA English DT Article DE GAMMA-RAYS, BURSTS; GAMMA RAYS, OBSERVATIONS ID HIGH-ENERGY TRANSIENT; RAY BURST AB Bursts from the soft gamma-ray repeaters (SGRs) appear to constitute a class of high-energy transients separate from typical gamma-ray bursts. Their distinct characteristics include stochastic burst repetition, short (approximately 0.1 s) durations, simple time histories, rise times as fast as 5 ms, spectra with characteristic energies of approximately 30 keV, and no indication of spectral evolution on time scales as short as approximately 0.1 s. Presently, only three repeaters are known. Thus, fundamental questions regarding their typical active lifetimes, celestial distribution, and luminosity function remain unresolved. We describe the results of a search for short transients resembling SGR bursts using the triggered fast memory of the hard X-ray burst spectrometer (HXRBS) on board the Solar Maximum Mission (SMM). This instrument operated for almost 10 years, from its launch in 1980 February until its demise in 1989 December. Each year its 40-degrees FWHM field of view scanned approximately one-quarter of the sky in the form of a band about 80-degrees wide centered on the ecliptic. HXRBS had a unique triggering capability with very short integration times of 4, 32, and 256 ms that made it ideal for detecting short, intense events. The effective HXRBS sensitivity for detecting SGR-like bursts longer than approximately 20 ms was routinely approximately 4 x 10(-7) ergs cm-2, and occasionally 8 x 10(-8) ergs cm-2. This search adds to the coverage by the International Cometary Explorer (ICE) of the most active repeater, SGR 1806-20, and indicates that the highly active phase of this source has not continued beyond 1984. We have found no other SGR-like source, but we identify some candidate events. Our results, combined with results from ICE and Konus observations and the assumption of a neutron star origin, enable us to make estimates of the burst-active time of an SGR source. In addition, we calculate the noise environment of the HXRBS CsI(Na) crystal on board SMM, a spacecraft in a low-inclination/low-altitude orbit, to be 1.5 x 10(-4) events s-1. C1 UNIV SPACE RES ASSOC,WASHINGTON,DC. USN,RES LAB,WASHINGTON,DC 20375. NASA,GODDARD SPACE FLIGHT CTR,ASTRON & SOLAR PHYS LAB,GREENBELT,MD 20771. UNIV ATHENS,DEPT PHYS,ATHENS,GREECE. NASA,GODDARD SPACE FLIGHT CTR,HIGH ENERGY ASTROPHYS LAB,GREENBELT,MD 20771. RI Dennis, Brian/C-9511-2012 NR 20 TC 9 Z9 9 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 JUN 10 PY 1992 VL 392 IS 1 BP 179 EP 186 DI 10.1086/171416 PN 1 PG 8 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA HY143 UT WOS:A1992HY14300019 ER PT J AU NEDOLUHA, GE BOWERS, PF AF NEDOLUHA, GE BOWERS, PF TI VLA OBSERVATIONS OF 1612 AND 1665 MHZ OH MASERS ASSOCIATED WITH IRC+10420 SO ASTROPHYSICAL JOURNAL LA English DT Article DE MASERS; POLARIZATION; STARS, INDIVIDUAL (IRC+10420) ID IRC + 10420; INFRARED SPECKLE INTERFEROMETRY; PROTO-PLANETARY-NEBULAE; U-ORIONIS; ASTROPHYSICAL MASERS; CIRCUMSTELLAR ENVELOPE; EVOLVED STARS; OH/IR STARS; DUST SHELLS; EMISSION AB Simultaneous spectral line VLA observations at 1612 and 1665 MHz in right and left circular polarizations have been obtained for the OH masers associated with the highly luminous supergiant IRC +10420. Comparison with previous data indicates that the 1612 MHz emission has increased by at least a factor of 3 at all velocities over the past 14 yr and by a factor of 60 at 55 km s-1. Meanwhile, the 1665 MHz emission has varied erratically, and the 1667 MHz emission has declined by a factor of 3. The unusual temporal behavior is similar to that observed for the Mira variable U Orionis. Most of the 1665 MHz maser components are distributed in a shell with a radius of 1".3, marginally smaller than the value of 1."5 for the main shell at 1612 MHz. However, there are indications of clumps or portions of shells at much smaller and larger radii. At some velocities, the angular structure of the 1612 MHz emission has changed significantly with time. It is possible to parameterize the majority of maser components by an oblate spheroid (axial ratio approximately 1.5) for which the near side of the equatorial plane is tilted almost-equal-to 25-degrees above the line of sight and the outflow velocity increases from almost-equal-to 28 km s-1 in the plane to almost-equal-to 63 km s-1 along the polar axis. The increases in maser intensity from widely separated portions of the shell over a time scale of a few years support a radiative pumping model, while the positions of the masers are consistent with the regions of highest expected OH density. At the radius of the maser shells (approximately 8000 AU), the magnetic field is estimated to be 15 mG greater than or similar to B greater than or similar to 1/6 mG. RP NEDOLUHA, GE (reprint author), USN,RES LAB,CTR ADV SPACE SENSING,CODE 4200,WASHINGTON,DC 20375, USA. NR 68 TC 42 Z9 42 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 JUN 10 PY 1992 VL 392 IS 1 BP 249 EP 263 DI 10.1086/171423 PN 1 PG 15 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA HY143 UT WOS:A1992HY14300026 ER PT J AU WANG, YM SHEELEY, NR AF WANG, YM SHEELEY, NR TI ON POTENTIAL-FIELD MODELS OF THE SOLAR CORONA SO ASTROPHYSICAL JOURNAL LA English DT Article DE INTERPLANETARY MEDIUM; SUN, CORONA; SUN, MAGNETIC FIELDS ID HELIOSPHERIC CURRENT SHEET; SIGHT BOUNDARY-CONDITIONS; SUNS POLAR FIELDS; MAGNETIC-FIELD; LAPLACES EQUATION; FLUX; EVOLUTION; HOLES; CYCLE AB The current-free approximation has been widely used to infer the magnetic structure of the solar corona from magnetograph observations. In such calculations, the potential field is usually matched directly to the observed line-of-sight component of the photospheric field. However, this procedure is invalid because the magnetograph measurements apply to deep atmospheric layers where the magnetic field is nonpotential and (for observations made in the Fe I lambda-5250 line) nearly radial. A better approach is to match only the radial component of the potential field to the photospheric data (corrected for line-of-sight projection on the assumption that the field lines are radially oriented), while allowing a discontinuity in the tangential field components. The implied current sheet is a mathematical idealization of the finite "boundary layer" within which the rapidly diverging field lines make their transition to a potential configuration. This procedure yields much stronger polar fields than the conventional line-of-sight method and resolves a number of discrepancies between earlier potential field calculations and observations of polar coronal holes, the brightness distribution of the K-corona, and the shape of the interplanetary current sheet. RP WANG, YM (reprint author), USN,RES LAB,EO HULBURT CTR SPACE RES,CODE 4172,WASHINGTON,DC 20375, USA. NR 53 TC 283 Z9 287 U1 2 U2 4 PU UNIV CHICAGO PRESS PI CHICAGO PA 5720 S WOODLAWN AVE, CHICAGO, IL 60637 SN 0004-637X J9 ASTROPHYS J JI Astrophys. J. PD JUN 10 PY 1992 VL 392 IS 1 BP 310 EP 319 DI 10.1086/171430 PN 1 PG 10 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA HY143 UT WOS:A1992HY14300033 ER PT J AU BERRIMAN, G REID, N LEGGETT, SK AF BERRIMAN, G REID, N LEGGETT, SK TI EFFECTIVE TEMPERATURES OF M-DWARFS SO ASTROPHYSICAL JOURNAL LA English DT Article DE STARS, LOW-MASS; BROWN DWARFS ID INFRARED PHOTOMETRY; STARS AB We have recalculated effective temperatures for the M dwarf stars observed by Berriman and Reid in 1987, using updated apparent magnitudes where appropriate. Our results show that the corrections to the photometry have little effect on the derived temperatures, and the Berriman and Reid results remain a valid temperature scale for low-mass stars. C1 CALTECH,PASADENA,CA 91125. UNIV SPACE RES ASSOC,FLAGSTAFF,AZ 86002. USN OBSERV,FLAGSTAFF STN,FLAGSTAFF,AZ 86002. RP BERRIMAN, G (reprint author), GEN SCI CORP,6100 CHEVY CHASE DR,LAUREL,MD 20707, USA. OI Leggett, Sandy/0000-0002-3681-2989 NR 19 TC 44 Z9 44 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 JUN 10 PY 1992 VL 392 IS 1 BP L31 EP L33 DI 10.1086/186418 PN 2 PG 3 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA HY144 UT WOS:A1992HY14400008 ER PT J AU PURDY, AP GEORGE, CF BREWER, GA AF PURDY, AP GEORGE, CF BREWER, GA TI SYNTHESIS, STRUCTURE, AND MAGNETIC-PROPERTIES OF CU4(MU-OCME3)6[OC(CF3)3]2 AND CU3(MU-OCME3)4[OC(CF3)3]2 SO INORGANIC CHEMISTRY LA English DT Article ID TRANSITION-METAL COMPLEXES; COPPER(II) ALKOXIDES; MOLECULAR-STRUCTURES; CRYSTAL; CLUSTER; DIMER; EXCHANGE; TEMPERATURE; REACTIVITY; PRECURSOR AB The reaction of a moderate excess of perfluoro-tert-butyl alcohol (H[PFTB]) with [Cu(OCMe3)2]n in hydrocarbon solvents affords two primary products, Cu4(mu-OCMe3)6[PFTB]2 (1) and Cu3(mu-OCMe3)4[PFTB]2 (2), with their relative amounts determined by the reaction stoichiometry. Compound 1 is purified by recrystallization, and 2 is isolated by sublimation of a mixture of 1 and 2. Both compounds have well-resolved NMR spectra (nu-1/2 = 45-90 Hz) and no X-band ESR spectra, indicative of a short electron relaxation time. Compound 1 crystallizes in space group P1BAR [fw = 1162.9, a = 10.609 (3) angstrom, b = 10.667 (3) angstrom, c = 11.151 (3) angstrom, alpha = 100.69 (3)-degrees, beta = 95.37 (3)-degrees, gamma = 99.65 (3)-degrees, V = 1212.3 (7) angstrom3, Z = 1 (two half-molecules), d(calcd) = 1.593 g/cm3, F(000) = 588, mu = 18.43 cm-1, T = 295 K]. It consists of three Cu2O2 linked twisted rings with bridging OCMe3 groups and two terminal PFTB groups, where the central Cu atoms are 4-coordinate and the two outer Cu atoms are 3-coordinate. The {CuO3} moieties are Y-shaped and planar [terminal Cu-O = 1.797 (5) angstrom, bridging 3-coordinate Cu-O = 1.856 (4) and 1.865 (4) angstrom, and bridging 4-coordinate Cu-O = 1.947 angstrom (average)]. Magnetic measurements (77-300 K) show both 1 and 2 to be antiferromagnetically coupled. The magnetic data for 1 fit a theoretical equation for a linear centrosymmetric tetranuclear d9 system [J = -131.6 (0.6) cm-1], and the data for 2 fit the corresponding trinuclear equation [J = -114.4 (1.5) cm-1]. C1 USN,RES LAB,STRUCT MATTER LAB,WASHINGTON,DC 20375. CATHOLIC UNIV AMER,DEPT CHEM,WASHINGTON,DC 20064. SFA INC,LANDOVER,MD 20785. RP PURDY, AP (reprint author), USN,RES LAB,DIV CHEM,CODE 6120,WASHINGTON,DC 20375, USA. NR 45 TC 17 Z9 17 U1 0 U2 1 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0020-1669 J9 INORG CHEM JI Inorg. Chem. PD JUN 10 PY 1992 VL 31 IS 12 BP 2633 EP 2638 DI 10.1021/ic00038a059 PG 6 WC Chemistry, Inorganic & Nuclear SC Chemistry GA HY814 UT WOS:A1992HY81400059 ER PT J AU DESISTO, WJ HENRY, RL NEWMAN, HS OSOFSKY, MS CESTONE, VC AF DESISTO, WJ HENRY, RL NEWMAN, HS OSOFSKY, MS CESTONE, VC TI METALORGANIC CHEMICAL VAPOR-DEPOSITION OF LOW MICROWAVE SURFACE-RESISTANCE YBA2CU3O7 ON (100) LAALO3 AND (100) SRTIO3 SO APPLIED PHYSICS LETTERS LA English DT Article AB Thin films of YBa2Cu3O7-delta on (100) LaAlO3 and (100) SrTiO3, up to 5000 angstrom thick, were grown by metalorganic chemical vapor deposition. The as-deposited films were c-axis oriented, and had transition temperatures between 87 and 89 K, transition widths less than or equal to 1 K, and critical current densities of 1-3X10(6) A/cm2 at 77 K. Microwave surface resistance measurements at 36 GHz on (100) LaAlO3 showed significant improvements over copper metal at 77 K. Films grown on (100) SrTiO3 exhibited slightly better properties than those grown on (100) LaAlO3. Films which were slightly deficient in barium and rich in yttrium consistently demonstrated superior properties. RP DESISTO, WJ (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. RI Osofsky, Michael/A-1050-2010 NR 8 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 0003-6951 J9 APPL PHYS LETT JI Appl. Phys. Lett. PD JUN 8 PY 1992 VL 60 IS 23 BP 2926 EP 2928 DI 10.1063/1.106822 PG 3 WC Physics, Applied SC Physics GA HX466 UT WOS:A1992HX46600036 ER PT J AU GOLDBERG, L HALL, DC MEHUYS, D AF GOLDBERG, L HALL, DC MEHUYS, D TI 3.3W CW DIFFRACTION LIMITED BROAD AREA SEMICONDUCTOR AMPLIFIER SO ELECTRONICS LETTERS LA English DT Article DE OPTICAL AMPLIFIERS; SEMICONDUCTOR DEVICES ID LASER AB A 600-mu-m wide GaAlAs travelling wave amplifier operating at 860 nm generated 3.3 W under CW saturated operation. The far field emission pattern was diffraction limited with a 0.08-degrees angular width. C1 SPECTRA DIODE LABS,SAN JOSE,CA 95134. RP GOLDBERG, L (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 10 TC 35 Z9 35 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 JUN 4 PY 1992 VL 28 IS 12 BP 1082 EP 1084 DI 10.1049/el:19920684 PG 3 WC Engineering, Electrical & Electronic SC Engineering GA HY581 UT WOS:A1992HY58100004 ER PT J AU DULING, IN ESMAN, RD AF DULING, IN ESMAN, RD TI SINGLE-POLARIZATION FIBER AMPLIFIER SO ELECTRONICS LETTERS LA English DT Article DE OPTICAL FIBERS; AMPLIFIERS; LASERS ID POLARIZATION AB A novel single-polarisation fibre amplifier design is presented. The use of a Faraday mirror in a double-pass design yields optical gain with high efficiency, without spatial hole burning and independent of gain-fibre birefringence. An amplifier, tunable polarised laser, and a high-power polarised super-fluorescent source are demonstrated. RP DULING, IN (reprint author), USN,RES LAB,CODE 6572,WASHINGTON,DC 20375, USA. NR 11 TC 51 Z9 51 U1 1 U2 6 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 JUN 4 PY 1992 VL 28 IS 12 BP 1126 EP 1128 DI 10.1049/el:19920710 PG 3 WC Engineering, Electrical & Electronic SC Engineering GA HY581 UT WOS:A1992HY58100030 ER PT J AU LAM, AW AF LAM, AW TI ARBITRARILY TIGHT PBE BOUNDS FOR OPTICAL CDMA COMMUNICATIONS SO ELECTRONICS LETTERS LA English DT Article DE OPTICAL COMMUNICATION; CODE DIVISION MULTIPLE ACCESS AB Arbitrarily tight upper and lower bounds on the probability of bit error (PBE) for direct-detection avalanche photodiode detector (APD) based code-division multiple-access (CDMA) communication systems are presented. Previously, only the Chernoff upper bound (CB), modified Chernoff upper bound (MCB), and Gaussian approximation (GA) of the PBE have been available. The MCB is calibrated. RP LAM, AW (reprint author), USN,POSTGRAD SCH,DEPT ELECT & COMP ENGN,MONTEREY,CA 93943, USA. NR 6 TC 0 Z9 0 U1 0 U2 0 PU IEE-INST ELEC ENG PI HERTFORD PA MICHAEL FARADAY HOUSE SIX HILLS WAY STEVENAGE, HERTFORD, ENGLAND SG1 2AY SN 0013-5194 J9 ELECTRON LETT JI Electron. Lett. PD JUN 4 PY 1992 VL 28 IS 12 BP 1139 EP 1140 DI 10.1049/el:19920718 PG 2 WC Engineering, Electrical & Electronic SC Engineering GA HY581 UT WOS:A1992HY58100038 ER PT J AU HUBA, JD MITCHELL, HG FEDDER, JA BERNHARDT, PA AF HUBA, JD MITCHELL, HG FEDDER, JA BERNHARDT, PA TI SKIDDING OF THE CRRES G-9 BARIUM RELEASE SO GEOPHYSICAL RESEARCH LETTERS LA English DT Article ID ION CLOUDS; IONOSPHERE; MOTION AB Experimental data and a simulation study of the CRRES G-9 ionospheric barium release are presented. Comparison of optical images of the release at times t congruent-to 0 and 21 sec indicate that the cloud 'skidded' approximately 9 km. The simulation study is based upon a 2D electrostatic code which incorporates time-dependent coupling to the background plasma. We find that the densest portion of the barium ion cloud 'skids' approximately 15 km within the first 3 sec following the release, consistent with analyses of the optical data. RP HUBA, JD (reprint author), USN,RES LAB,SPACE PLASMA BRANCH,CODE 4780,WASHINGTON,DC 20375, USA. NR 16 TC 23 Z9 23 U1 1 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 JUN 2 PY 1992 VL 19 IS 11 BP 1085 EP 1088 DI 10.1029/92GL01109 PG 4 WC Geosciences, Multidisciplinary SC Geology GA HX652 UT WOS:A1992HX65200005 ER PT J AU BACMEISTER, JT SCHOEBERL, MR LOEWENSTEIN, M PODOLSKE, JR STRAHAN, SE CHAN, KR AF BACMEISTER, JT SCHOEBERL, MR LOEWENSTEIN, M PODOLSKE, JR STRAHAN, SE CHAN, KR TI AN ESTIMATE OF THE RELATIVE MAGNITUDE OF SMALL-SCALE TRACER FLUXES SO GEOPHYSICAL RESEARCH LETTERS LA English DT Article ID STRATOSPHERE; TRANSPORT; OZONE AB The wind and constituent measurements from the polar aircraft data are used to compute the flux spectra. Although there is variation from flight to flight, the flux spectra generally fit a -2 to -1.5 power law as expected theoretically. This result suggests that tracer fluxes from small scale features do not substantially contribute to the overall tracer budget relative to the fluxes from the larger scales. C1 NASA,GODDARD SPACE FLIGHT CTR,GREENBELT,MD 20771. NASA,AMES RES CTR,MOFFETT FIELD,CA 94035. RP BACMEISTER, JT (reprint author), USN,RES LAB,CODE 4141,WASHINGTON,DC 20375, USA. RI Strahan, Susan/H-1965-2012 NR 13 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 JUN 2 PY 1992 VL 19 IS 11 BP 1101 EP 1104 DI 10.1029/92GL01039 PG 4 WC Geosciences, Multidisciplinary SC Geology GA HX652 UT WOS:A1992HX65200009 ER PT J AU VANDERMEER, RA AF VANDERMEER, RA TI MICROSTRUCTURAL PATH CONCEPT APPLIED TO NORMAL GRAIN-GROWTH SO ACTA METALLURGICA ET MATERIALIA LA English DT Article ID 3 DIMENSIONS; ALUMINUM; CERAMICS; METALS AB Normal grain growth in solids is considered in the light of a microstructural path concept. The topological model first presented by Rhines and Craig is corrected and reformulated so as to include the Doherty sweep constant. The reformulated model predicts the experimentally observed linear time dependence for volumetric grain growth only when the average curvature per grain remains constant during growth. A geometrical path function for normal grain growth relating average microstructural properties on a per grain basis is proposed and compared with experimental observations on aluminum and titanium. By combining the geometrical path function with the topological model, further comprehension of normal grain growth kinetics results, specifically the role of the average grain shape. RP VANDERMEER, RA (reprint author), USN, RES LAB, DIV MAT SCI & TECHNOL, WASHINGTON, DC 20375 USA. NR 27 TC 5 Z9 5 U1 1 U2 2 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLAND SN 0956-7151 J9 ACTA METALL MATER JI Acta Metall. Mater. PD JUN PY 1992 VL 40 IS 6 BP 1159 EP 1166 DI 10.1016/0956-7151(92)90414-A PG 8 WC Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Materials Science; Metallurgy & Metallurgical Engineering GA HW524 UT WOS:A1992HW52400005 ER PT J AU HARTMANN, B LEE, GF AF HARTMANN, B LEE, GF TI ESTIMATION OF SOUND SPEEDS USING ADDITIVE PROPERTIES SO ACUSTICA LA French DT Article AB The method of additive properties is used to estimate longitudinal and shear sound speed in polymers. The procedure is to calculate the component contributions to the molar mass, molar volume, bulk modulus function, and shear modulus function and to combine these to calculate sound speeds. These calculations are carried out for the epoxy series previously studied as well as three linear amorphous polymers and polyethylenes of varying crystallinity. In the case of polyethylene, a distinction is made between crystalline and amorphous methylene groups. In this manner, polyethylene sound speeds as a function of density are calculated and found to agree satisfactorily with experiment. In addition, the temperature dependence of sound speeds is also in good agreement with experiment. RP HARTMANN, B (reprint author), USN,CTR SURFACE WARFARE,NONMET MAT BRANCH,CODE R31,SILVER SPRING,MD 20903, USA. NR 9 TC 3 Z9 3 U1 0 U2 2 PU S HIRZEL VERLAG PI STUTTGART PA POSTFACH 10 10 61, D-70 009 STUTTGART, GERMANY SN 0001-7884 J9 ACUSTICA JI Acustica PD JUN PY 1992 VL 76 IS 5 BP 241 EP 246 PG 6 WC Acoustics SC Acoustics GA JB806 UT WOS:A1992JB80600004 ER PT J AU HEDLUND, ER HIGGINS, CW ROZANSKI, CS SWINFORD, NF HILL, JA AF HEDLUND, ER HIGGINS, CW ROZANSKI, CS SWINFORD, NF HILL, JA TI NEW HIGH REYNOLDS-NUMBER MACH 8 CAPABILITY SO AIAA JOURNAL LA English DT Note RP HEDLUND, ER (reprint author), USN,CTR SURFACE WARFARE,AERODYNAM BRANCH,K24,WHITE OAK,MD 20910, USA. NR 9 TC 1 Z9 1 U1 0 U2 0 PU AMER INST AERONAUT ASTRONAUT PI RESTON PA 1801 ALEXANDER BELL DRIVE, STE 500, RESTON, VA 22091 SN 0001-1452 J9 AIAA J JI AIAA J. PD JUN PY 1992 VL 30 IS 6 BP 1665 EP 1667 DI 10.2514/3.11119 PG 3 WC Engineering, Aerospace SC Engineering GA HX732 UT WOS:A1992HX73200034 ER PT J AU GRIMM, IS SCHINDLER, W HALUSZKA, O AF GRIMM, IS SCHINDLER, W HALUSZKA, O TI STEATOHEPATITIS AND FATAL HEPATIC-FAILURE AFTER BILIOPANCREATIC DIVERSION SO AMERICAN JOURNAL OF GASTROENTEROLOGY LA English DT Note ID MORBID-OBESITY; PARENTERAL-NUTRITION; CLINICAL-EXPERIENCE; JEJUNOILEAL-BYPASS; GASTRIC BYPASS; MALNUTRITION; CIRRHOSIS; SURGERY AB Steatohepatitis and hepatic failure are well known complications of jejunoileal bypass, an operation that has been abandoned as a treatment for severe obesity because of its potential for adverse metabolic consequences. Biliopancreatic diversion is a novel operation designed to avoid the harmful effects of jejunoileal bypass. Although it has not gained wide acceptance, this procedure is being advocated by some surgeons as a safe and effective treatment for severe obesity. Published reports indicate that liver histology generally remains stable or improves after biliopancreatic diversion. We present a patient who developed steatohepatitis and subsequently died in hepatic failure after this operation. Severe liver disease should be added to the list of complications that may follow biliopancreatic diversion. C1 USN,DEPT INTERNAL MED,DIV GASTROENTEROL,SAN DIEGO,CA 92134. RP GRIMM, IS (reprint author), USN,DEPT CLIN INVEST,SAN DIEGO,CA 92134, USA. NR 29 TC 66 Z9 66 U1 0 U2 0 PU WILLIAMS & WILKINS PI BALTIMORE PA 351 WEST CAMDEN ST, BALTIMORE, MD 21201-2436 SN 0002-9270 J9 AM J GASTROENTEROL JI Am. J. Gastroenterol. PD JUN PY 1992 VL 87 IS 6 BP 775 EP 779 PG 5 WC Gastroenterology & Hepatology SC Gastroenterology & Hepatology GA HX180 UT WOS:A1992HX18000020 PM 1590319 ER PT J AU BANGS, MJ PURNOMO ANTHONY, RL AF BANGS, MJ PURNOMO ANTHONY, RL TI PLASMODIUM-OVALE IN THE HIGHLANDS OF IRIAN JAYA, INDONESIA SO ANNALS OF TROPICAL MEDICINE AND PARASITOLOGY LA English DT Note ID PAPUA-NEW-GUINEA; MALARIA; REGION RP BANGS, MJ (reprint author), USN,MED RES UNIT 2,PUBLICAT OFF,APO,SAN FRANCISCO,CA 96520, USA. NR 8 TC 10 Z9 10 U1 0 U2 0 PU CARFAX PUBL CO PI ABINGDON PA PO BOX 25, ABINGDON, OXFORDSHIRE, ENGLAND OX14 3UE SN 0003-4983 J9 ANN TROP MED PARASIT JI Ann. Trop. Med. Parasitol. PD JUN PY 1992 VL 86 IS 3 BP 307 EP 308 PG 2 WC Public, Environmental & Occupational Health; Parasitology; Tropical Medicine SC Public, Environmental & Occupational Health; Parasitology; Tropical Medicine GA JH720 UT WOS:A1992JH72000013 PM 1449279 ER PT J AU WEIS, RS KERSEY, AD MARRONE, MD AF WEIS, RS KERSEY, AD MARRONE, MD TI FIBEROPTIC 2-BEAM INTERFEROMETER FRINGE AMPLITUDE RECOVERY USING LASER FREQUENCY CONTROL SO APPLIED OPTICS LA English DT Article ID POLARIZATION CONTROL AB The recovery of interference fringe amplitude by controlling only the laser current is demonstrated. Control of the interfering beam polarization states is not required. C1 USN,RES LAB,OPT TECHN BRANCH,WASHINGTON,DC 20375. RP WEIS, RS (reprint author), USN ACAD,DEPT ELECT ENGN,MAIL STOP 14-B,ANNAPOLIS,MD 21402, USA. NR 13 TC 0 Z9 0 U1 0 U2 0 PU OPTICAL SOC AMER PI WASHINGTON PA 2010 MASSACHUSETTS AVE NW, WASHINGTON, DC 20036 SN 0003-6935 J9 APPL OPTICS JI Appl. Optics PD JUN 1 PY 1992 VL 31 IS 16 BP 2964 EP 2966 PG 3 WC Optics SC Optics GA HV954 UT WOS:A1992HV95400002 PM 20725230 ER PT J AU HOIBERG, A WHITE, JF AF HOIBERG, A WHITE, JF TI HEALTH-STATUS OF WOMEN IN THE ARMED-FORCES SO ARMED FORCES & SOCIETY LA English DT Article; Proceedings Paper CT INTER-UNIVERSITY SEMINAR ON ARMED FORCES AND SOCIETY CY OCT 27-29, 1989 CL BALTIMORE, MD SP USN, NAVAL MED RES & DEV COMMAND ID GENDER; WORK AB This article examines a study of the health status and attrition rates of three 5-year cohorts of U.S. Navy women (n = 119,167) who enlisted between 1973 and 1987. Comparisons also were conducted with women's data from other branches of the military. Results show that pregnancy-related conditions, primarily childbirth, were the leading reasons for a hospitalization, followed by genitourinary conditions and mental disorders. The most frequently occuring reasons for a premature separation were for pregnancy/parenthood and unsuitability. The time interval of greatest vulnerability for a hospitalization or separation tended to be after the first year of active duty. Such findings support the need for further research on the psychosocial correlates of early active-duty pregnancies as well as for the implementation of such training programs as planned parenthood. RP HOIBERG, A (reprint author), USN,HLTH RES CTR,POB 85122,SAN DIEGO,CA 92186, USA. NR 26 TC 9 Z9 9 U1 1 U2 2 PU TRANSACTION PERIOD CONSORTIUM PI NEW BRUNSWICK PA DEPT 3091 RUTGERS-THE STATE UNIV OF NJ, NEW BRUNSWICK, NJ 08903 SN 0095-327X J9 ARMED FORCES SOC JI Armed Forces Soc. PD SUM PY 1992 VL 18 IS 4 BP 514 EP 533 DI 10.1177/0095327X9201800405 PG 20 WC Political Science; Sociology SC Government & Law; Sociology GA JM373 UT WOS:A1992JM37300005 ER PT J AU VANDYK, SD AF VANDYK, SD TI ASSOCIATION OF SUPERNOVAE WITH RECENT STAR FORMATION REGIONS IN LATE TYPE GALAXIES SO ASTRONOMICAL JOURNAL LA English DT Review ID H-II REGIONS; MASS HELIUM STAR; SPIRAL GALAXIES; IB SUPERNOVAE; LIGHT CURVES; EXTRAGALACTIC SUPERNOVAE; 30 DORADUS; IA; EXPLOSIONS; 1985F AB A statistical study has been carried out to constrain the various models for the progenitors of supernovae of types Ia, Ib/c, and II. Star formation regions in late type galaxies are traced out by H II regions, imaged through photographic and CCD observations, and possible supernova association with these regions is based on the ratio of the angular separation of each supernova from its nearest H II region to the angular extent of the H II region in the direction of the supernova. The specific problems of supernova classification and positional uncertainties, as well as the probability of chance superposition, are also considered. The results suggest that type Ia supernovae do not arise from massive, short-lived stellar populations. Type Ib/c and type II supernovae, however, are very likely to be associated with H II regions and therefore with massive stellar progenitors. The single Wolf-Rayet star progenitor model for the type Ib/c supernovae is not supported. It is not clear from the results whether a difference between the association of type Ib/c supernovae and the association of type II supernovae with H II regions exists, but this probably results from the effects of small-number statistics for the type Ib/c supernovae. Not all type Ib/c and type II supernovae were found to be associated with detected H II regions; these supernovae either may have had runaway O star progenitors or were associated with H II regions below detectability. C1 USN,RES LAB,CTR ADV SPACE SENSING,WASHINGTON,DC 20375. NR 158 TC 55 Z9 55 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 JUN PY 1992 VL 103 IS 6 BP 1788 EP 1803 DI 10.1086/116195 PG 16 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA HV913 UT WOS:A1992HV91300007 ER PT J AU RUSSELL, JL JAUNCEY, DL HARVEY, BR WHITE, GL REYNOLDS, JE MA, C JOHNSTON, KJ NOTHNAGEL, A NICOLSON, G KINGHAM, K HINDSLEY, R DEVEGT, C ZACHARIAS, N MALIN, DF AF RUSSELL, JL JAUNCEY, DL HARVEY, BR WHITE, GL REYNOLDS, JE MA, C JOHNSTON, KJ NOTHNAGEL, A NICOLSON, G KINGHAM, K HINDSLEY, R DEVEGT, C ZACHARIAS, N MALIN, DF TI A RADIO OPTICAL REFERENCE FRAME .3. ADDITIONAL RADIO AND OPTICAL POSITIONS IN THE SOUTHERN-HEMISPHERE SO ASTRONOMICAL JOURNAL LA English DT Article ID VLBI; INTERFEROMETRY; CATALOG AB Radio and optical positions are presented for southern hemisphere extragalactic sources from the Parkes 2.7 GHz survey. Sixty-one sources were observed with Mark III VLBI at 8.4 GHz (X band) between Tidbinbilla, Australia and Hartebeesthoek, South Africa. The results presented are part of the effort to establish a global reference frame of 400 extragalactic radio sources. Radio positions with approximately 10 milliarcsec errors have been estimated for 39 sources not previously in our radio reference frame catalog, and provisional positions were obtained for two additional sources, bringing the total number of catalog sources to 276. The principal source of error is the uncalibrated ionosphere. Of the remaining sources five were completely undetected, six were either too faint or too resolved, and nine had previous catalog positions. Optical positions on the FK5 system have also been measured for four southern sources using prime focus plates from the Anglo-Australian 4 m telescope with an accuracy 0.06". This raises to 40 the number of radio sources with accurately measured positions for their optical counterparts. C1 APPL RES CORP,LANDOVER,MD 20785. CSIRO,AUSTRALIA TELESCOPE NATL FACIL,EPPING,NSW 2121,AUSTRALIA. AUSTRALIAN NATL UNIV,MT STROMLO & SIDING SPRING OBSERV,CANBERRA,ACT 2601,AUSTRALIA. NASA,GODDARD SPACE FLIGHT CTR,GREENBELT,MD 20771. UNIV BONN,INST GEODET,W-5300 BONN,GERMANY. HARTEBEESTHOEK RADIO ASTRON OBSERV,KRUGERSDORP,SOUTH AFRICA. USN OBSERV,WASHINGTON,DC 20390. USNO,BLACK BIRCH ASTROMET OBSERV,BLENHEIM,NEW ZEALAND. UNIV HAMBURG,HAMBURGER STERNWARTE,W-2000 HAMBURG 13,GERMANY. ANGLO AUSTRALIAN OBSERV,EPPING,NSW 2121,AUSTRALIA. RP RUSSELL, JL (reprint author), USN,RES LAB,CODE 4210,WASHINGTON,DC 20375, USA. RI Ma, Chopo/D-4751-2012 NR 17 TC 28 Z9 28 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 JUN PY 1992 VL 103 IS 6 BP 2090 EP 2098 DI 10.1086/116213 PG 9 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA HV913 UT WOS:A1992HV91300025 ER PT J AU QUIRRENBACH, A MOZURKEWICH, D ARMSTRONG, JT JOHNSTON, KJ COLAVITA, MM SHAO, M AF QUIRRENBACH, A MOZURKEWICH, D ARMSTRONG, JT JOHNSTON, KJ COLAVITA, MM SHAO, M TI INTERFEROMETRIC OBSERVATIONS OF MIRA (O-CETI) SO ASTRONOMY & ASTROPHYSICS LA English DT Letter DE INTERFEROMETRY; STARS, ATMOSPHERES OF; STARS, DIAMETERS OF; STARS, LONG-PERIOD VARIABLES; STARS, VARIABLE AB The long-period variable Mira (omicron-Ceti) has been observed at 800 nm wavelength with the MkIII Optical Interferometer at photometric phases phi = 0.96, 0.05, and 0.14 in 1990; some additional data were taken in 1989. The star is not spherically symmetric, and temporal variations of the size and the position angle of the asymmetry are detected. The visibility data can be represented by two uniform elliptical disks, which could correspond to different layers in Mira's atmosphere. If the size variations are interpreted in terms of physical motion of the emitting material, an infall velocity of approximately 15 km s-1 around phi = 0 is derived. C1 USN, RES LAB, CTR ADV SPACE SENSING, WASHINGTON, DC 20375 USA. JET PROP LAB, PASADENA, CA 91109 USA. UNIV SPACE RES ASSOC, WASHINGTON, DC USA. RP QUIRRENBACH, A (reprint author), USN OBSERV, NRL USNO OPT INTERFEROMETER PROJECT, AD5, 34TH ST & MASS AVE NW, WASHINGTON, DC 20392 USA. NR 12 TC 46 Z9 46 U1 0 U2 0 PU EDP SCIENCES S A PI LES ULIS CEDEX A PA 17, AVE DU HOGGAR, PA COURTABOEUF, BP 112, F-91944 LES ULIS CEDEX A, FRANCE SN 0004-6361 J9 ASTRON ASTROPHYS JI Astron. Astrophys. PD JUN PY 1992 VL 259 IS 1 BP L19 EP L22 PG 4 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA HX468 UT WOS:A1992HX46800006 ER PT J AU BENKA, SG HOLMAN, GD AF BENKA, SG HOLMAN, GD TI A THERMAL NONTHERMAL MODEL FOR SOLAR MICROWAVE-BURSTS SO ASTROPHYSICAL JOURNAL LA English DT Article DE RADIATION MECHANISMS; CYCLOTRON AND SYNCHROTRON; SUN, FLARES; SUN, RADIO RADIATION ID TO-LIMB VARIATION; RUNAWAY ELECTRONS; X-RAY; RADIATION; FLARES; ACCELERATION; EMISSION; CORONA; PLASMA; SIGNATURES AB High-resolution spectra of microwave bursts from Owens Valley Radio Observatory show numerous departures from expectations based on simple thermal or nonthermal models. In particular, (1) approximately 80% of the events show more than one spectral peak; (2) many burst have a low-side spectral index steeper than the maximum expected slope; and (3) the peak frequency stays relatively constant, and changes intensity in concert with the secondary peaks throughout a given event's evolution. We develop a theoretical formalism allowing both thermal and nonthermal particles to coexist in the flaring plasma. Within this formalism, we show that the observed spectral features can be accounted for through gyrosynchrotron radiation. Specifically: 1. The "secondary" components seen on the low-frequency side of many spectra are nonthermal enhancements superposed upon thermal radiation, occurring between the thermal harmonics. 2. A steep optically thick slope is accounted for by the thermal absorption of nonthermal radiation. 3. If the coexistence of thermal and nonthermal particles is interpreted in terms of electron heating and acceleration in current sheets, a changing electric field strength can account for the gross evolution of the microwave spectra. We present our model distribution function, use it to calculate gyrosynchrotron spectra, and systematically analyze these spectra. We demonstrate the applicability of this approach by fitting an observed Owens Valley spectrum. Last, we offer our physical interpretation of the thermal/nonthermal distribution function as it relates to solar flares. C1 NASA,GODDARD SPACE FLIGHT CTR,ASTRON & SOLAR PHYS LAB,GREENBELT,MD 20771. RP BENKA, SG (reprint author), USN,RES LAB,EO HULBURT CTR SPACE RES,CODE 4171B,WASHINGTON,DC 20375, USA. RI Holman, Gordon/C-9548-2012 NR 37 TC 47 Z9 48 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 JUN 1 PY 1992 VL 391 IS 2 BP 854 EP 864 DI 10.1086/171394 PN 1 PG 11 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA HV512 UT WOS:A1992HV51200038 ER PT J AU SMITH, AM HILL, RS VRBA, FJ TIMOTHY, JG AF SMITH, AM HILL, RS VRBA, FJ TIMOTHY, JG TI FAR-ULTRAVIOLET MAMA DETECTOR IMAGERY AND EMISSION-LINE CCD IMAGERY OF NGC-6240 SO ASTROPHYSICAL JOURNAL LA English DT Article DE GALAXIES, INTERACTIONS; GALAXIES, PECULIAR; GALAXIES, PHOTOMETRY; STARS, FORMATION ID ROCKET ULTRAVIOLET; INTERACTING GALAXY; STAR FORMATION; REGIONS AB We have obtained an image of the luminous infrared galaxy NGC 6240 at 1480 angstrom using a multianode microchannel array (MAMA) detector with a rocket-borne telescope. At distances greater than 12" from the nucleus the measured ultraviolet luminosity implies intensive star formation activity equal to 2-3 times that of a spiral galaxy such as M83. Optical images in the H-beta and [O III] lambda-5007 emission lines reveal a region of high excitation east of the nucleus between the centers of disks 1 and 2 as described by Bland-Hawthorn et al. C1 HUGHES STX CORP,LANHAM,MD 20706. USN OBSERV,FLAGSTAFF STN,FLAGSTAFF,AZ 86002. STANFORD UNIV,CTR SPACE SCI,STANFORD,CA 94305. RP SMITH, AM (reprint author), NASA,GODDARD SPACE FLIGHT CTR,ASTRON & SOLAR PHYS LAB,CODE 681,GREENBELT,MD 20771, USA. NR 18 TC 9 Z9 9 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 JUN 1 PY 1992 VL 391 IS 2 BP L81 EP L84 DI 10.1086/186403 PN 2 PG 4 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA HV513 UT WOS:A1992HV51300008 ER PT J AU JENKINS, FH BAGGETT, JC AF JENKINS, FH BAGGETT, JC TI COMPULSIVE PERSONALITY-TRAITS AFFECTING AERONAUTICAL ADAPTABILITY IN A NAVAL AVIATOR - A CASE-REPORT SO AVIATION SPACE AND ENVIRONMENTAL MEDICINE LA English DT Article AB This is a case report of a male naval aviator who demonstrated compulsive personality traits which adversely affected the performance of his duties as a pilot trainee, and later, as a naval flight officer. The Diagnostic and Statistical Manual of the American Psychiatric Association (DSM-III-R) uses the term obsessive-comPulsive to describe two conditions. A review of terminology is undertaken to present the reader with the distinguishing features of the personality disorder versus the anxiety disorder. The anxiety disorder, obsessive-compulsive disorder, is incompatible with safe performance of aviation duties. Obsessive-compulsive personality, on the other hand, describes a point on a continuum where useful, adaptive compulsive traits may become abnormally exaggerated and maladaptive, thus interfering with the aviator's normal routine, occupational functioning, relationships with others, and aviation safety. C1 NAVAL AEROSP MED INST,DEPT AVIAT PSYCHIAT,NAVAL AIR STN,PENSACOLA,FL 32508. NR 7 TC 2 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 JUN PY 1992 VL 63 IS 6 BP 529 EP 532 PG 4 WC Public, Environmental & Occupational Health; Medicine, General & Internal; Sport Sciences SC Public, Environmental & Occupational Health; General & Internal Medicine; Sport Sciences GA HX203 UT WOS:A1992HX20300011 PM 1520224 ER PT J AU GLENDENING, JW BURK, SD AF GLENDENING, JW BURK, SD TI TURBULENT TRANSPORT FROM AN ARCTIC LEAD - A LARGE-EDDY SIMULATION SO BOUNDARY-LAYER METEOROLOGY LA English DT Article ID BOUNDARY-LAYER; SEA ICE; CANADIAN ARCHIPELAGO; CLIMATE SENSITIVITY; HEAT-FLUX; MODEL; POLYNYAS AB The upward transfer of heat from ocean to atmosphere is examined for an Arctic "lead". a break in the Arctic ice which allows contact between the cold atmosphere and the relatively warm ocean. We employ a large-eddy model to compute explicitly the three-dimensional turbulent response of the atmosphere to a lead of 200 m width. The surface heat flux creates a turbulent "plume" of individual quasi-random eddies, not a continuous updraft. which penetrate into the stable atmosphere and transport heat upward. Maximum updraft velocities and turbulence occur downwind of the lead rather than over the lead itself, because the development time of an individual thermal eddy is longer than its transit time across the lead. The affected vertical region. while shallow over the lead itself, grows to a height of 65 m at 600 m downwind of the lead; beyond that. the depth of the turbulent region decreases as the eddies weaken. The maximum vertical turbulent heat flux occurs at the downwind edge of the lead. beyond which a relative maximum extends upward into the plume. Negative surface heat flux immediately downwind of the lead creates a growing stable layer. but above that internal boundary layer the turbulent heat flux is still positive. Updraft maxima are typically 28 cm/s, but compensating downdrafts result in time-averaged vertical velocities of less than 1 cm/s in the plume. Conditional sampling separates the updraft and downdraft contributions. Formulas for the horizontal eddy development distance and for the vertical plume penetration height are presented. The relative importance of mean and turbulent transport is compared for both vertical and horizontal heat transfer: turbulence dominates the vertical heat transport whereas mean advection dominates the horizontal transport, these offsetting transports producing a quasi-stationary state. C1 NOAA,RES LAB,ATMOSPHER DIRECTORATE,MONTEREY,CA. RP GLENDENING, JW (reprint author), USN,POSTGRAD SCH,DEPT METEOROL,MONTEREY,CA 93940, USA. NR 18 TC 38 Z9 38 U1 0 U2 4 PU KLUWER ACADEMIC PUBL PI DORDRECHT PA SPUIBOULEVARD 50, PO BOX 17, 3300 AA DORDRECHT, NETHERLANDS SN 0006-8314 J9 BOUND-LAY METEOROL JI Bound.-Layer Meteor. PD JUN PY 1992 VL 59 IS 4 BP 315 EP 339 DI 10.1007/BF02215457 PG 25 WC Meteorology & Atmospheric Sciences SC Meteorology & Atmospheric Sciences GA JC113 UT WOS:A1992JC11300001 ER PT J AU SMITH, DR SNOW, JT SPANGLER, TC HOUGHTON, DD GEER, IW AF SMITH, DR SNOW, JT SPANGLER, TC HOUGHTON, DD GEER, IW TI MEETING REPORT ON THE 1992 AMS SYMPOSIUM ON EDUCATION SO BULLETIN OF THE AMERICAN METEOROLOGICAL SOCIETY LA English DT Editorial Material C1 PURDUE UNIV,DEPT EARTH & ATMOSPHER SCI,W LAFAYETTE,IN 47907. UCAR COMET,BOULDER,CO. AMER METEOROL SOC,WASHINGTON,DC. UNIV WISCONSIN,DEPT ATMOSPHER & OCEAN SCI,MADISON,WI 53706. RP SMITH, DR (reprint author), USN ACAD,DEPT OCEANOG,ANNAPOLIS,MD 21402, USA. NR 8 TC 4 Z9 4 U1 0 U2 0 PU AMER METEOROLOGICAL SOC PI BOSTON PA 45 BEACON ST, BOSTON, MA 02108-3693 SN 0003-0007 J9 B AM METEOROL SOC JI Bull. Amer. Meteorol. Soc. PD JUN PY 1992 VL 73 IS 6 BP 795 EP 799 PG 5 WC Meteorology & Atmospheric Sciences SC Meteorology & Atmospheric Sciences GA HZ588 UT WOS:A1992HZ58800005 ER PT J AU GURTNER, P BASS, T GUDEMAN, SK PENIX, JO PHILPUT, CB SCHINCO, FP AF GURTNER, P BASS, T GUDEMAN, SK PENIX, JO PHILPUT, CB SCHINCO, FP TI SURGICAL-MANAGEMENT OF POSTHEMORRHAGIC HYDROCEPHALUS IN 22 LOW-BIRTH-WEIGHT INFANTS SO CHILDS NERVOUS SYSTEM LA English DT Article DE PERIVENTRICULAR-INTRAVENTRICULAR HEMORRHAGE; POSTHEMORRHAGIC HYDROCEPHALUS; LOW BIRTH WEIGHT; SUBCUTANEOUS VENTRICULAR RESERVOIR; VENTRICULOPERITONEAL SHUNT; EXTERNAL VENTRICULAR DRAIN ID POST-HEMORRHAGIC HYDROCEPHALUS; INTRACRANIAL HEMORRHAGE; PREMATURE-INFANTS; PRETERM INFANTS; VENTRICULAR DILATATION; LUMBAR PUNCTURES; NEWBORN; SHUNTS AB In order to assess the complication rates of cerebrospinal fluid diversion techniques used at our institution, a retrospective study of the surgical management of posthemorrhagic hydrocephalus was conducted from a population of 547 premature infants admitted to the neonatal intensive care unit from 1987 to 1989. The incidences of periventricular-intraventricular hemorrhage in the 3 years studied were 44%, 37%, and 27%, respectively. Thirty-nine of the infants developed posthemorrhagic hydrocephalus as determined by serial cranial ultrasonography; 22 required cerebrospinal fluid diversion. During the study period, we began using subcutaneous ventricular reservoirs and a low-pressure Neonatal Shunt (customized device) in infants weighing less than 1500 g at the time of instrumentation. This change in management was associated with a significant reduction (P < 0.005) in the morbidity and mortality compared to the use of external ventricular drainage devices. On the basis of these findings, the use of external ventricular drainage devices was discontinued. C1 EASTERN VIRGINIA MED SCH,CHILDRENS HOSP KINGS DAUGHTERS,DEPT PEDIAT,DIV NEONATOL,800 W OLNEY RD,NORFOLK,VA 23507. USN HOSP,CLIN INVEST & RES DEPT,PORTSMOUTH,VA 23508. NR 28 TC 39 Z9 41 U1 1 U2 1 PU SPRINGER VERLAG PI NEW YORK PA 175 FIFTH AVE, NEW YORK, NY 10010 SN 0256-7040 J9 CHILD NERV SYST JI Childs Nerv. Syst. PD JUN PY 1992 VL 8 IS 4 BP 198 EP 202 DI 10.1007/BF00262844 PG 5 WC Clinical Neurology; Pediatrics; Surgery SC Neurosciences & Neurology; Pediatrics; Surgery GA JD402 UT WOS:A1992JD40200005 PM 1394250 ER PT J AU RABINOVICI, R RUDOLPH, AS LIGLER, FS SMITH, EF FEUERSTEIN, G AF RABINOVICI, R RUDOLPH, AS LIGLER, FS SMITH, EF FEUERSTEIN, G TI BIOLOGICAL RESPONSES TO EXCHANGE-TRANSFUSION WITH LIPOSOME-ENCAPSULATED HEMOGLOBIN SO CIRCULATORY SHOCK LA English DT Article DE RED CELL SUBSTITUTE; BLOOD PRESSURE; CARDIAC OUTPUT; PERIPHERAL RESISTANCE; BLOOD GASES; ACIDOSIS ID SYNTHETIC ERYTHROCYTES; BLOOD SUBSTITUTE; OXYGEN-TRANSPORT; CARDIAC-OUTPUT; RED-CELL; RAT; HEMODILUTION; COMPONENTS; CLEARANCE AB The present study evaluates the biological responses to 10% blood volume infusion ("top-loading," n = 7) or 50% blood volume exchange transfusion (n = 8) with a new preparation of liposome-encapsulated hemoglobin (LEH) in the conscious rat. Top-loading did not affect systemic hemodynamic variables but induced transient thrombocytopenia (-36% +/- 7%; P < 0.05) and elevation of plasma thromboxane B2 (12.4 +/- 3.8 pg/100-mu-l vs. undetectable levels at the control; P < 0.05). Rats exchanged with LEH maintained mean arterial pressure (MAP) during the 3 hr observation period, whereas control (0.9% NaCl or lactated Ringer's solution) animals developed hypotension (-23 +/- 5 mm Hg, P < 0.05). The maintenance of MAP in the LEH group resulted from the opposing effects of LEH-induced increase in total peripheral resistance index (TPRI; +0.06 +/- 0.01 mm Hg/ml/min/kg; P < 0.05), and decreased cardiac index, (Cl, -25 +/- 6 ml/min/kg, P < 0.05). In contrast, the decline in MAP in the control groups could be attributed to the lower Cl (-65 +/- 8 ml/min/kg; P < 0.05). All rats developed metabolic acidosis (base excess of -9.7 +/- 0.6 mmol/liter; P < 0.05), which was transient in the LEH group but progressive in the control groups. These data support the possible use of LEH as a blood substitute when massive transfusions are needed. C1 USN,RES LAB,CTR BIOMOLEC SCI & ENGN,WASHINGTON,DC 20375. SMITHKLINE BEECHAM PHARMACEUT,DEPT PHARMACOL,KING OF PRUSSIA,PA. RP RABINOVICI, R (reprint author), THOMAS JEFFERSON UNIV,JEFFERSON MED COLL,DEPT SURG,1025 WALNUT ST,PHILADELPHIA,PA 19107, USA. NR 39 TC 43 Z9 43 U1 3 U2 3 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 JUN PY 1992 VL 37 IS 2 BP 124 EP 133 PG 10 WC Cardiac & Cardiovascular Systems SC Cardiovascular System & Cardiology GA HY147 UT WOS:A1992HY14700004 PM 1511503 ER PT J AU SUBA, EA MCKENNA, TM WILLIAMS, TJ AF SUBA, EA MCKENNA, TM WILLIAMS, TJ TI DIFFERENTIAL CONTRACTILE RESPONSES OF MESENTERIC AND PULMONARY-ARTERY SEGMENTS TO NOREPINEPHRINE AND PHORBOL ESTER IN THE SEPTIC PIG SO CIRCULATORY SHOCK LA English DT Article DE SWINE; GRAM-NEGATIVE SEPSIS; VASCULAR RESPONSES; ADRENERGIC RECEPTOR; PHORBOL ESTER ID VASCULAR SMOOTH-MUSCLE; PROTEIN KINASE-C; RAT AORTA; SEPSIS; ENDOTHELIUM; INVITRO; SHOCK AB The contractile response of isolated vascular segments was studied in Yucatan miniature swine approximately 48 hr after induction of sepsis by intraperitoneal injection of live Escherichia coli. Compared to non-septic controls, segments of the cranial mesenteric artery from septic animals showed a significantly attenuated contractile response to the adrenergic receptor agonist norepinephrine (NE). The EC50 for NE increased from 1.1 +/- 0.3 to 6.3 +/- 2.0-mu-M and the E(max) decreased from 1,010 +/- 179 to 387 +/- 75 mg tension/mg tissue. In contrast, segments of the pulmonary artery showed no significant difference in contractility to NE between sham-operated and septic animals. Mesenteric and pulmonary artery segments from both septic and control animals exhibited similar contraction to the protein kinase C activator phorbol-12,13-dibutyrate. This suggests that the observed hyporeactivity to NE in porcine mesenteric artery segments is not simply due to cellular damage by toxins associated with the septic state. The results also indicate that the impact of gram-negative sepsis on vascular contractile function varies between tissue from the systemic and pulmonary circulation in pigs. RP SUBA, EA (reprint author), USN,MED RES INST,SEPTIC SHOCK RES PROGRAM,MAIL STOP 42,BETHESDA,MD 20889, USA. NR 33 TC 12 Z9 12 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 JUN PY 1992 VL 37 IS 2 BP 164 EP 168 PG 5 WC Cardiac & Cardiovascular Systems SC Cardiovascular System & Cardiology GA HY147 UT WOS:A1992HY14700009 PM 1511508 ER PT J AU KENNEDY, CA GOETZ, MB HAAKE, DA AF KENNEDY, CA GOETZ, MB HAAKE, DA TI FREQUENCY OF ADULT RESPIRATORY-DISTRESS SYNDROME IN PREGNANT-WOMEN WHO HAVE PYELONEPHRITIS - REPLY SO CLINICAL INFECTIOUS DISEASES LA English DT Letter C1 UNIV CALIF LOS ANGELES,LOS ANGELES,CA 90024. RP KENNEDY, CA (reprint author), USN HOSP,DEPT INTERNAL MED,DIV INFECT DIS,SAN DIEGO,CA 92134, USA. NR 8 TC 0 Z9 0 U1 0 U2 0 PU UNIV CHICAGO PRESS PI CHICAGO PA 5720 S WOODLAWN AVE, CHICAGO, IL 60637 SN 1058-4838 J9 CLIN INFECT DIS JI Clin. Infect. Dis. PD JUN PY 1992 VL 14 IS 6 BP 1260 EP 1261 PG 2 WC Immunology; Infectious Diseases; Microbiology SC Immunology; Infectious Diseases; Microbiology GA HW264 UT WOS:A1992HW26400015 ER PT J AU WALLACE, MR HOOPER, DG AF WALLACE, MR HOOPER, DG TI IMMUNITY TO MEASLES DURING PREGNANCY SO CLINICAL INFECTIOUS DISEASES LA English DT Letter C1 USN HOSP,DEPT INTERNAL MED,DIV NEUROSURG,SAN DIEGO,CA 92134. RP WALLACE, MR (reprint author), USN HOSP,DEPT LAB & CLIN INVEST,SAN DIEGO,CA 92134, USA. NR 3 TC 3 Z9 3 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 JUN PY 1992 VL 14 IS 6 BP 1262 EP 1262 PG 1 WC Immunology; Infectious Diseases; Microbiology SC Immunology; Infectious Diseases; Microbiology GA HW264 UT WOS:A1992HW26400017 PM 1623085 ER PT J AU OBRIEN, TJ MACK, GR AF OBRIEN, TJ MACK, GR TI MULTIFOCAL OSTEONECROSIS AFTER SHORT-TERM HIGH-DOSE CORTICOSTEROID-THERAPY - A CASE-REPORT SO CLINICAL ORTHOPAEDICS AND RELATED RESEARCH LA English DT Article ID STEROID-THERAPY; NECROSIS; BONE AB Osteonecrosis is a common sequela of long-term steroid therapy. This paper presents the only case of multifocal osteonecrosis to occur after a short-term course of methylprednisolone for treatment of septic shock. Two years after receiving a two-week course of corticosteroid treatment, the patient developed pain in his right and left shoulders and left hip. Roentgenograms and magnetic resonance imaging revealed changes consistent with osteonecrosis of both humeral heads and the femoral head. The patient failed to respond to conservative treatment and eventually was treated with bipolar hip replacement. C1 USN HOSP,DEPT CLIN INVEST,SAN DIEGO,CA 92134. USN HOSP,DEPT ORTHOPED,SAN DIEGO,CA 92134. NR 15 TC 29 Z9 29 U1 0 U2 0 PU LIPPINCOTT-RAVEN PUBL PI PHILADELPHIA PA 227 EAST WASHINGTON SQ, PHILADELPHIA, PA 19106 SN 0009-921X J9 CLIN ORTHOP RELAT R JI Clin. Orthop. Rel. Res. PD JUN PY 1992 IS 279 BP 176 EP 179 PG 4 WC Orthopedics; Surgery SC Orthopedics; Surgery GA HZ325 UT WOS:A1992HZ32500022 PM 1600653 ER PT J AU COLTON, CA COLTON, JS GILBERT, DL AF COLTON, CA COLTON, JS GILBERT, DL TI OXYGEN DEPENDENCY OF SYNAPTIC TRANSMISSION AT THE SQUID LOLIGO-PEALEI GIANT SYNAPSE SO COMPARATIVE BIOCHEMISTRY AND PHYSIOLOGY A-PHYSIOLOGY LA English DT Article ID ANOXIA; CHANNELS AB 1. Synaptic transmission at the squid giant synapse was blocked in 45 min by exposure to 0.02 atm oxygen but was maintained for more than 90 min in air (0.21 atm oxygen) or pure oxygen (1 atm). 2. Excitatory post-synaptic potential amplitude decreased in 0.02 atm oxygen but did not change in either 1 or 0.21 atm oxygen. Fast facilitation was increased in 0.02 atm oxygen only. 3. Post-synaptic resting membrane potential (V(m)) and input resistance (R(o)) remained unchanged in 1 or 0.21 atm oxygen but R(o) was increased in 0.02 atm oxygen. 4. Our results suggest that severe hypoxia decreased the release of transmitter from the pre-synaptic terminal. C1 NINCDS,BIOPHYS LAB,BETHESDA,MD 20892. USN MED COMMAND,NAVAL MED RES INST,HIGH PRESSURE LAB,BETHESDA,MD 20814. MARINE BIOL LAB,WOODS HOLE,MA 02543. RP COLTON, CA (reprint author), GEORGETOWN UNIV,SCH MED,DEPT PHYSIOL & BIOPHYS,WASHINGTON,DC 20007, USA. NR 20 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 0300-9629 J9 COMP BIOCHEM PHYS A JI Comp. Biochem. Physiol. A-Physiol. PD JUN PY 1992 VL 102 IS 2 BP 279 EP 283 DI 10.1016/0300-9629(92)90135-D PG 5 WC Biochemistry & Molecular Biology; Physiology; Zoology SC Biochemistry & Molecular Biology; Physiology; Zoology GA HZ083 UT WOS:A1992HZ08300011 PM 1354577 ER PT J AU LUNDY, GM AKYILDIZ, IF AF LUNDY, GM AKYILDIZ, IF TI SPECIFICATION AND ANALYSIS OF THE FDDI MAC PROTOCOL USING SYSTEMS OF COMMUNICATING MACHINES SO COMPUTER COMMUNICATIONS LA English DT Article DE MAC PROTOCOL; FDDI; PROTOCOL SPECIFICATION AB A model designed for the specification of communication protocols called systems of communicating machines is used to specify the FDDI token ring protocol, and to analyse its safety and 'liveness' properties. This model specifies each node as a finite state machine which has a set of local variables. With each transition is an enabling predicate and action. The predicates determine whether transitions may be taken, and actions alter the variable values as the transition executes. Communication between nodes is through shared variables. Our contributions include the specification of the basic FDDI protocol using a formal description technique; the use of this specification to analyse the safety and liveness properties of the network; the extension of the formal model to include the timing of transitions; and confirmation of the timing properties of the protocol. C1 GEORGIA INST TECHNOL,COLL COMP,ATLANTA,GA 30332. RP LUNDY, GM (reprint author), USN,POSTGRAD SCH,DEPT COMP SCI,MONTEREY,CA 93940, USA. RI Akyildiz, Ian/G-7136-2011 OI Akyildiz, Ian/0000-0002-8099-3529 NR 12 TC 1 Z9 1 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0140-3664 J9 COMPUT COMMUN JI Comput. Commun. PD JUN PY 1992 VL 15 IS 5 BP 286 EP 294 DI 10.1016/0140-3664(92)90089-W PG 9 WC Computer Science, Information Systems; Engineering, Electrical & Electronic; Telecommunications SC Computer Science; Engineering; Telecommunications GA HV463 UT WOS:A1992HV46300002 ER PT J AU MANTEL, KE HARTT, WH CHEN, TY AF MANTEL, KE HARTT, WH CHEN, TY TI SUBSTRATE, SURFACE FINISH, AND FLOW-RATE INFLUENCES ON CALCAREOUS DEPOSIT STRUCTURE SO CORROSION LA English DT Article DE CALCAREOUS DEPOSITS; FLOW RATE EFFECTS; MORPHOLOGY; NATURAL SEAWATER; SURFACE FINISH EFFECTS ID TEMPERATURE; SEA AB Experiments have been performed where 10 18 (UNS G10180), A710(UNS K20747), A537 (UNS K02400), and HY80 (UNS K31820) steel specimens, of surface finish corresponding to no. 120, 320, 600, and 1500 polishing, were polarized potentiostatically in seawater at -900 mV (SCE). The resulting calcareous deposits were analyzed with regard to structure, composition, and morphology, and they were found to be comprised of a relatively thin, inner Mg-rich layer that formed initially and a subsequent thicker, outer aragonite precipitate. The effect of this dual deposit structure, as well as variations in substrate, surface finish, and electrolyte flow rate, on current density decay was evaluated. The observed trends are discussed in terms of the film formation process and cathodic protection utility. C1 NALCO CHEM CO,NAPERVILLE,IL 60563. FLORIDA ATLANTIC UNIV,CTR MARINE MAT,BOCA RATON,FL 33431. RP MANTEL, KE (reprint author), USN,CTR SURFACE WARFARE,CORROS TECHNOL GRP,CODE R33,DANIA,FL 33004, USA. NR 15 TC 40 Z9 43 U1 1 U2 2 PU NATL ASSN CORROSION ENG PI HOUSTON PA 1440 SOUTH CREEK DRIVE, HOUSTON, TX 77084-4906 SN 0010-9312 J9 CORROSION JI Corrosion PD JUN PY 1992 VL 48 IS 6 BP 489 EP 500 PG 12 WC Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Materials Science; Metallurgy & Metallurgical Engineering GA JL884 UT WOS:A1992JL88400008 ER PT J AU JONES, TR HOFFMAN, SL AF JONES, TR HOFFMAN, SL TI IMMUNOLOGY AND PATHOGENIC MECHANISMS OF MALARIA SO CURRENT OPINION IN INFECTIOUS DISEASES LA English DT Article AB The malaria situation is worsening worldwide. Significant advances in our understanding of malaria, the parasite that causes it, and methods for controlling it are noted and discussed. Although no vaccine is yet ready for distribution, important advances have been made in the area of antigen discovery. Due to ever increasing problems with chloroquine resistance, the use of mefloquine as the prophylactic agent of choice has increased, but not without problems. The role of cytokines, including tumor necrosis factor, interferon, and the interleukins, in the initiation and prevention of malarial illness was also further defined in the past year. RP JONES, TR (reprint author), USN,MED RES INST,MALARIA PROGRAM,12300 WASHINGTON AVE,ROCKVILLE,MD 20852, USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU RAPID SCIENCE PUBLISHERS PI LONDON PA 2-6 BOUNDARY ROW, LONDON, ENGLAND SE1 8NH SN 0951-7375 J9 CURR OPIN INFECT DIS JI Curr. Opin. Infect. Dis. PD JUN PY 1992 VL 5 IS 3 BP 310 EP 318 DI 10.1097/00001432-199206000-00002 PG 9 WC Infectious Diseases SC Infectious Diseases GA HY588 UT WOS:A1992HY58800002 ER PT J AU WRIGHT, K AF WRIGHT, K TI BIBLIOGRAPHIC DATABASE-MANAGEMENT IN AN RESEARCH-AND-DEVELOPMENT ORGANIZATION - INFORMATION-SPECIALISTS HELPING END-USERS SO DATABASE LA English DT Article RP WRIGHT, K (reprint author), USN,CTR OCEAN SYST,TECH LIB CODE 9642,SAN DIEGO,CA 92152, USA. NR 3 TC 1 Z9 1 U1 0 U2 0 PU ONLINE INC PI WILTON PA 462 DANBURY RD, WILTON, CT 06897-2126 SN 0162-4105 J9 DATABASE JI Database PD JUN PY 1992 VL 15 IS 3 BP 35 EP & PG 0 WC Computer Science, Information Systems; Information Science & Library Science SC Computer Science; Information Science & Library Science GA HT873 UT WOS:A1992HT87300007 ER PT J AU RICHARDSON, PL ARNAULT, S GARZOLI, S BRUCE, JG AF RICHARDSON, PL ARNAULT, S GARZOLI, S BRUCE, JG TI ANNUAL CYCLE OF THE ATLANTIC NORTH EQUATORIAL COUNTERCURRENT SO DEEP-SEA RESEARCH PART A-OCEANOGRAPHIC RESEARCH PAPERS LA English DT Article ID SHIP DRIFTS; OCEAN; CURRENTS; SURFACE; WIND AB An analysis of numerous meridional XBT sections near 28-degrees-W reveals that the geostrophic North Equatorial Countercurrent (NECC) continues to flow eastward throughout the year, fastest in fall and slowest in spring. Drifting buoys and historical ship drifts show that the near-surface Countercurrent reverses each spring even when systematic errors due to windage are taken into account. The seasonally fluctuating winds drive an Ekman surface current that is eastward in fall, adding to the geostrophic current, and westward in spring, countering and overwhelming the geostrophic current. The reversal of the Countercurrent in spring occurs in the near-surface layer and is driven by the Northeast Trades. Thus the near-surface velocity in the Countercurrent is determined by a competition between local wind stress and the larger field of wind stress curl, both of which have large seasonal variations in the tropical Atlantic. C1 UNIV PARIS 06,OCEANOG DYNAM & CLIMATOL,F-75252 PARIS 05,FRANCE. USN,OCEANOG OFF,OCEAN TECHNOL BRANCH,BAY ST LOUIS,MS 39522. COLUMBIA UNIV,LAMONT DOHERTY GEOL OBSERV,PALISADES,NY 10964. RP RICHARDSON, PL (reprint author), WOODS HOLE OCEANOG INST,DEPT PHYS OCEANOG,WOODS HOLE,MA 02543, USA. RI Garzoli, Silvia/A-3556-2010 OI Garzoli, Silvia/0000-0003-3553-2253 NR 24 TC 24 Z9 24 U1 2 U2 5 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0198-0149 J9 DEEP-SEA RES PD JUN PY 1992 VL 39 IS 6A BP 997 EP 1014 DI 10.1016/0198-0149(92)90036-S PG 18 WC Oceanography SC Oceanography GA JB853 UT WOS:A1992JB85300005 ER PT J AU RABINDRA, P SENGUPTA, SK WELCH, RM AF RABINDRA, P SENGUPTA, SK WELCH, RM TI AN INTERACTIVE HYBRID EXPERT SYSTEM FOR POLAR CLOUD AND SURFACE CLASSIFICATION SO ENVIRONMETRICS LA English DT Article DE INTERACTIVE; EXPERT SYSTEM; POLAR; CLASSIFICATION AB An interactive hybrid expert system is developed to classify polar scenes using AVHRR LAC imagery. A total of 183 spectral and textural signatures axe generated from which the 20 "best" are chosen using the Sequential Forward Selection procedure. These 20 features are used to populate the working memory of the expert system. A probabilistic neural network is used as the inference engine to make probabilistic estimates of class membership. As part of the inference engine, a sophisticated outlier test is performed to provide a measure of classification confidence. During a session, the user is provided with an extensive set of on-screen aids to assist in labelling. The user may modify the knowledge base by adding new samples to existing classes or by including new classes. The expert system provides confidence measures and a distance measure from the proposed class cluster centre. The interactive environment allows the user to test the impact of class labelling upon the knowledge base before new data is entered. For users working with very large datasets and very complex scenes, the integrity of the knowledge base is the primary concern. A bootstrap method is used to validate classification accuracy. On the basis of 100 bootstrap samples, an overall classification accuracy of 87% is achieved, with a standard deviation of 1%. The result is that much more accurate cloud classification in polar regions now can be made, which will aid us in our monitoring of global climate change. RP RABINDRA, P (reprint author), USN,OCEANOG & ATMOSPHER RES LAB,MONTEREY,CA 93943, USA. NR 0 TC 7 Z9 7 U1 0 U2 0 PU JOHN WILEY & SONS LTD PI W SUSSEX PA BAFFINS LANE CHICHESTER, W SUSSEX, ENGLAND PO19 1UD SN 1180-4009 J9 ENVIRONMETRICS JI Environmetrics PD JUN PY 1992 VL 3 IS 2 BP 121 EP 147 DI 10.1002/env.3170030201 PG 27 WC Environmental Sciences; Mathematics, Interdisciplinary Applications; Statistics & Probability SC Environmental Sciences & Ecology; Mathematics GA JL027 UT WOS:A1992JL02700001 ER PT J AU KAMMEYER, JW AF KAMMEYER, JW TI A CLASSIFICATION OF THE ISOMETRIC EXTENSIONS OF A MULTIDIMENSIONAL BERNOULLI SHIFT SO ERGODIC THEORY AND DYNAMICAL SYSTEMS LA English DT Article AB The isometric extensions of a multidimensional Bernouli shift are classified completely, up to C-isomorphism, and up to isomorphism. If such an extension is weakly mixing then it must be Bernoulli; otherwise, it has a rotation factor, which has a Bernoulli complementary algebra. This result is extended to multidimensional Bernoulli flows and Bernoulli shifts of infinite entropy. C1 USN ACAD,DEPT MATH,ANNAPOLIS,MD 21402. NR 7 TC 7 Z9 7 U1 0 U2 0 PU CAMBRIDGE UNIV PRESS PI NEW YORK PA 40 WEST 20TH STREET, NEW YORK, NY 10011-4211 SN 0143-3857 J9 ERGOD THEOR DYN SYST JI Ergod. Theory Dyn. Syst. PD JUN PY 1992 VL 12 BP 267 EP 282 PN 2 PG 16 WC Mathematics, Applied; Mathematics SC Mathematics GA JH910 UT WOS:A1992JH91000008 ER PT J AU COLL, AR AF COLL, AR TI AMERICA AS THE GRAND FACILITATOR SO FOREIGN POLICY LA English DT Article C1 USN,COLL WAR,WASHINGTON,DC 20350. RP COLL, AR (reprint author), GEORGETOWN UNIV,GOVT,WASHINGTON,DC 20057, USA. NR 0 TC 1 Z9 1 U1 0 U2 0 PU CARNEGIE ENDOWMENT INTL PEACE PI WASHINGTON PA 2400 N STREET NW, WASHINGTON, DC 20037 SN 0015-7228 J9 FOREIGN POLICY JI Foreign Policy PD SUM PY 1992 IS 87 BP 47 EP 65 DI 10.2307/1149160 PG 19 WC International Relations SC International Relations GA HW909 UT WOS:A1992HW90900003 ER PT J AU ABENHEIM, D AF ABENHEIM, D TI A NAZI LEGACY - RIGHT-WING EXTREMISM IN POSTWAR GERMANY - LEWIS,RC SO HISTORIAN LA English DT Book Review RP ABENHEIM, D (reprint author), USN,POSTGRAD SCH,WASHINGTON,DC 20350, USA. NR 1 TC 0 Z9 0 U1 0 U2 0 PU PHI ALPHA THETA PI ALLENTOWN PA THE HISTORIAN 50 COLLEGE DR, ALLENTOWN, PA 18104-6100 SN 0018-2370 J9 HISTORIAN JI Historian PD SUM PY 1992 VL 54 IS 4 BP 719 EP 720 PG 2 WC History SC History GA JL074 UT WOS:A1992JL07400029 ER PT J AU SITKIN, SB SUTCLIFFE, KM BARRIOSCHOPLIN, JR AF SITKIN, SB SUTCLIFFE, KM BARRIOSCHOPLIN, JR TI A DUAL-CAPACITY MODEL OF COMMUNICATION MEDIA CHOICE IN ORGANIZATIONS SO HUMAN COMMUNICATION RESEARCH LA English DT Article; Proceedings Paper CT 1989 ANNUAL MEETING OF THE ACADEMY OF MANAGEMENT CY 1989 CL WASHINGTON, DC SP ACAD MANAGEMENT ID DECISION-MAKING; ELECTRONIC MAIL; INFORMATION; CULTURE; RICHNESS; STRATEGY AB Most previous research concerning communication media choice in organizations has stressed the capacity of media to convey data. More recently, scholars have examined the capacity of media to convey and manifest meaning. Rarely have both functions been considered concurrently. In this article, a model is proposed that not only permits the simultaneous examination of these two functions but reflects that media use is influenced by characteristics of the task, individual and organizational capability constraints, and normative factors. By exploring the implications of this expanded dual-capacity perspective, a more encompassing theory of the determinants of communication media use in organizations is proposed. C1 UNIV MINNESOTA,SCH MANAGEMENT,MINNEAPOLIS,MN 55455. USN,POSTGRAD SCH,DEPT ADM SCI,MONTEREY,CA 93940. RP SITKIN, SB (reprint author), UNIV TEXAS,DEPT MANAGEMENT,AUSTIN,TX 78712, USA. NR 103 TC 78 Z9 78 U1 3 U2 11 PU SAGE PUBLICATIONS INC PI THOUSAND OAKS PA 2455 TELLER RD, THOUSAND OAKS, CA 91320 SN 0360-3989 J9 HUM COMMUN RES JI Hum. Commun. Res. PD JUN PY 1992 VL 18 IS 4 BP 563 EP 598 PG 36 WC Communication SC Communication GA HY390 UT WOS:A1992HY39000003 ER PT J AU DOLL, TJ HANNA, TE RUSSOTTI, JS AF DOLL, TJ HANNA, TE RUSSOTTI, JS TI MASKING IN 3-DIMENSIONAL AUDITORY DISPLAYS SO HUMAN FACTORS LA English DT Article AB The extent to which simultaneous inputs in a three-dimensional (3D) auditory display mask one another was studied in a simulated sonar task. The minimum signal-to-noise ratio (SNR) required to detect an amplitude-modulated 500-Hz tone in a background of broadband noise was measured using a loudspeaker array in a free field. Three aspects of the 3D array were varied: angular separation of the sources, degree of correlation of the background noises, and listener head movement. Masking was substantially reduced when the sources were uncorrelated. The SNR needed for detection decreased with source separation, and the rate of decrease was significantly greater with uncorrelated sources than with partially or fully correlated sources. Head movement had no effect on the SNR required for detection. Implications for the design and application of 3D auditory displays are discussed. C1 USN,SUBMARINE MED RES LAB,US SUBMARINE BASE,GROTON,CT 06340. RP DOLL, TJ (reprint author), GEORGIA INST TECHNOL,RES INST,ELECTROOPT LAB,ATLANTA,GA 30332, USA. NR 27 TC 8 Z9 8 U1 0 U2 1 PU HUMAN FACTORS SOC PI SANTA MONICA PA BOX 1369, SANTA MONICA, CA 90406 SN 0018-7208 J9 HUM FACTORS JI Hum. Factors PD JUN PY 1992 VL 34 IS 3 BP 255 EP 265 PG 11 WC Behavioral Sciences; Engineering, Industrial; Ergonomics; Psychology, Applied; Psychology SC Behavioral Sciences; Engineering; Psychology GA JC059 UT WOS:A1992JC05900001 PM 1634239 ER PT J AU DRISKELL, JE SALAS, E AF DRISKELL, JE SALAS, E TI COLLECTIVE BEHAVIOR AND TEAM PERFORMANCE SO HUMAN FACTORS LA English DT Article AB Modern complex systems require effective team performance, yet the question of which factors determine effective teams remains to be answered. Group researchers suggest that collective or interdependent behavior is a critical component of team interaction. Furthermore, anecdotal evidence suggests that some team members are less collectively oriented than others and that the tendency to ignore task inputs from others is one factor that contributes to poor team performance. In this study we develop a procedure for differentiating collectively oriented versus egocentric team members. Experimental results confirm that collectively oriented team members were more likely to attend to the task inputs of other team members and to improve their performance during team interaction than were egocentric team members. C1 ROLLINS COLL,PSYCHOL,WINTER PK,FL 32789. USN,CTR TRAINING SYST,DIV HUMAN FACTORS,ORLANDO,FL. RP DRISKELL, JE (reprint author), FLORIDA MAXIMA CORP,147 E LYMAN AVE,WINTER PK,FL 32789, USA. NR 33 TC 70 Z9 70 U1 3 U2 22 PU HUMAN FACTORS SOC PI SANTA MONICA PA BOX 1369, SANTA MONICA, CA 90406 SN 0018-7208 J9 HUM FACTORS JI Hum. Factors PD JUN PY 1992 VL 34 IS 3 BP 277 EP 288 PG 12 WC Behavioral Sciences; Engineering, Industrial; Ergonomics; Psychology, Applied; Psychology SC Behavioral Sciences; Engineering; Psychology GA JC059 UT WOS:A1992JC05900003 ER PT J AU SCHEPS, R AF SCHEPS, R TI LASER-DIODE-PUMPED CR-LISRGAF6 LASER SO IEEE PHOTONICS TECHNOLOGY LETTERS LA English DT Article AB Diode-pumped operation of a Cr:LiSrGaF6 laser is described. Efficient performance was obtained between 810 and 855 nm. The maximum output power was 130 mW at 810 nm, and the slope efficiency was 26%. The sample was pumped with a total incident power of 560 mW using two polarization-combined high power visible laser diodes. These results represent the highest CW power reported for a diode-pumped Cr-doped laser. RP SCHEPS, R (reprint author), USN,CTR OCEAN SYST,CODE 754,SAN DIEGO,CA 92152, USA. NR 15 TC 8 Z9 8 U1 0 U2 0 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 1041-1135 J9 IEEE PHOTONIC TECH L JI IEEE Photonics Technol. Lett. PD JUN PY 1992 VL 4 IS 6 BP 548 EP 550 DI 10.1109/68.141963 PG 3 WC Engineering, Electrical & Electronic; Optics; Physics, Applied SC Engineering; Optics; Physics GA HX435 UT WOS:A1992HX43500011 ER PT J AU SIOMACCO, EM TUMMALA, M AF SIOMACCO, EM TUMMALA, M TI PARAMETRIC MODELING OF INTEGRATED-CIRCUIT INTERCONNECTIONS SO IEEE TRANSACTIONS ON CIRCUITS AND SYSTEMS II-EXPRESS BRIEFS LA English DT Note AB This paper presents a parametric approach to the modeling and characterization of high frequency losses and dispersive propagation on integrated-circuit (IC) interconnections. An autoregressive moving-average (ARMA) model is based on a lumped equivalent circuit of a lossy microstrip transmission line. Model parameters are estimated from on-wafer time-domain measurements using a weighted least squares (WLS) algorithm and an Elmore delay approximation technique. It is shown that the effective microstrip permittivity can be evaluated from the estimated ARMA model parameters. Experimental results are compared with computer simulations of the lumped equivalent circuit and ARMA parametric models. RP SIOMACCO, EM (reprint author), USN, POSTGRAD SCH, DEPT ELECT & COMP ENGN, MONTEREY, CA 93940 USA. NR 16 TC 0 Z9 0 U1 0 U2 0 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 JUN PY 1992 VL 39 IS 6 BP 377 EP 382 DI 10.1109/82.145295 PG 6 WC Engineering, Electrical & Electronic SC Engineering GA JD571 UT WOS:A1992JD57100006 ER PT J AU MERAKOS, LF EXLEY, GM AF MERAKOS, LF EXLEY, GM TI PERFORMANCE ANALYSIS OF A STACK RANDOM-ACCESS ALGORITHM FOR CSMA AND CSMA/CD CHANNELS SO IEEE TRANSACTIONS ON COMMUNICATIONS LA English DT Article ID SENSE MULTIPLE-ACCESS; RADIO CHANNELS; DELAY ANALYSIS; STABILITY AB We propose and analyze a stack random access algorithm for CSMA and CSMA/CD channels. The algorithm adapts its operation to the characteristics of the channel at hand by means of two parameters. Utilizing the regenerative character of the induced packet delay process, we derive a lower bound on the algorithm's maximum stable throughput, and very tight upper and lower bounds on the mean packet delay. We also estimate the packet delay distribution using the regenerative simulation method. The proposed algorithm is inherently stable, easy to implement, and combines high performance with modest channel monitoring requirements. C1 USN,CTR UNDERWATER SYST,DEPT SUBMARINE ELECTROMAGNET SYST,NEW LONDON,CT 06320. RP MERAKOS, LF (reprint author), NORTHEASTERN UNIV,DEPT ELECT & COMP ENGN,COMMUN & DIGITAL SIGNAL PROC RES CTR,BOSTON,MA 02115, USA. NR 28 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 0090-6778 J9 IEEE T COMMUN JI IEEE Trans. Commun. PD JUN PY 1992 VL 40 IS 6 BP 1047 EP 1058 DI 10.1109/26.142795 PG 12 WC Engineering, Electrical & Electronic; Telecommunications SC Engineering; Telecommunications GA JB674 UT WOS:A1992JB67400009 ER PT J AU STEVENS, RS KAPLAN, DJ AF STEVENS, RS KAPLAN, DJ TI DETERMINACY OF GENERALIZED SCHEMA SO IEEE TRANSACTIONS ON COMPUTERS LA English DT Note DE COMMUTATIVITY; COMPUTATION GRAPH; DATA FLOW; DEADLOCK; DETERMINACY; MULTIPROCESSOR; PERSISTENCE AB Karp and Miller's computation graphs have been widely studied because they are a useful abstraction of multiprocessor computation. A system has the determinacy property if whenever the same set of input streams are entered into the system, the resultant output is the same set of output streams. Karp and Miller showed that computation graphs have this property; Woo, Smith, and Agrawala showed that data flow schema also have the property of determinacy. We define a more general model than either of the foregoing, called a multiple component system model (MCSM). We prove that MCSM's have the determinacy property. We then define deadlocking and prove some additional properties of deadlocking MCSM's. RP STEVENS, RS (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 3 TC 0 Z9 0 U1 0 U2 0 PU IEEE COMPUTER SOC PI LOS ALAMITOS PA 10662 LOS VAQUEROS CIRCLE, PO BOX 3014, LOS ALAMITOS, CA 90720-1264 SN 0018-9340 J9 IEEE T COMPUT JI IEEE Trans. Comput. PD JUN PY 1992 VL 41 IS 6 BP 776 EP 779 DI 10.1109/12.144630 PG 4 WC Computer Science, Hardware & Architecture; Engineering, Electrical & Electronic SC Computer Science; Engineering GA JD830 UT WOS:A1992JD83000013 ER PT J AU CROSKEY, CL KAMPFER, N BELIVACQUA, RM HARTMANN, GK KUNZI, KF SCHWARTZ, PR OLIVERO, JJ PULIAFITO, SE AELLIG, C UMLAUFT, G WALTMAN, WB DEGENHARDT, W AF CROSKEY, CL KAMPFER, N BELIVACQUA, RM HARTMANN, GK KUNZI, KF SCHWARTZ, PR OLIVERO, JJ PULIAFITO, SE AELLIG, C UMLAUFT, G WALTMAN, WB DEGENHARDT, W TI THE MILLIMETER-WAVE ATMOSPHERIC SOUNDER (MAS) - A SHUTTLE-BASED REMOTE-SENSING EXPERIMENT SO IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES LA English DT Article ID GLOBAL TEMPERATURE TRENDS; WATER-VAPOR; OZONE; SATELLITES; PROFILES; CLO AB The Millimeter Wave Atmospheric Sounder (MAS) will be launched by the Space Shuttle in the spring of 1992 as part of the ATLAS 1 (ATmospheric Laboratory for Application and Science) mission. Using passive limb-scanning millimeter wave radiometry, it will sense the thermal emission produced by ozone at 184 GHz, water vapor at 183 GHz, chlorine monoxide at 204 GHz, and oxygen (for retrieval of temperature and pressure) at 60 GHz. From these observations, concentration profiles of these gases throughout the middle atmosphere will be made. This paper describes the fundamentals of the measurements, the design of the radiometers, and the approaches used for the data analysis. C1 UNIV BERN,INST APPL PHYS,CH-3000 BERN,SWITZERLAND. USN,RES LAB,CTR ADV SPACE SENSING,RADIO INFRARED OPT SENSORS BRANCH,WASHINGTON,DC 20375. MAX PLANCK INST AERON,LINDAU,GERMANY. UNIV BREMEN,DEPT PHYS,W-2800 BREMEN 33,GERMANY. RP CROSKEY, CL (reprint author), PENN STATE UNIV,DEPT ELECT & COMP ENGN,COMMUN & SPACE SCI LAB,304 ELECT ENGN E,UNIV PK,PA 16802, USA. NR 27 TC 36 Z9 36 U1 0 U2 1 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0018-9480 J9 IEEE T MICROW THEORY JI IEEE Trans. Microw. Theory Tech. PD JUN PY 1992 VL 40 IS 6 BP 1090 EP 1100 DI 10.1109/22.141340 PG 11 WC Engineering, Electrical & Electronic SC Engineering GA HZ012 UT WOS:A1992HZ01200008 ER PT J AU PEASE, RL COMBS, W CLARK, S AF PEASE, RL COMBS, W CLARK, S TI LONG-TERM IONIZATION RESPONSE OF SEVERAL BICMOS VLSIC TECHNOLOGIES SO IEEE TRANSACTIONS ON NUCLEAR SCIENCE LA English DT Article; Proceedings Paper CT 1ST EUROPEAN CONF ON RADIATION AND ITS EFFECTS ON DEVICES AND SYSTEMS ( RADECS 91 ) CY SEP 09-12, 1991 CL LA GRANDE MOTTE, FRANCE AB BiCMOS is emerging as a strong competitor to CMOS for gate arrays and memories because of its performance advantages for the same feature size. In this paper we examine the long term ionization response of five BiCMOS technologies by characterizing test structures which emphasize the various failure modes of CMOS and bipolar. The primary failure modes are found to be associated with the recessed field oxide isolation; edge leakage in the n channel MOSFETs and buried layer to buried layer leakage in the bipolar. The ionization failure thresholds for worst case bias were in the range of 5-20 Krad(Si) for both failure modes in all five technologies. C1 USN,CTR WEAPONS SUPPORT,CRANE,IN 47522. RP PEASE, RL (reprint author), MISSION RES CORP,1720 RANDOLPH RD SE,ALBUQUERQUE,NM 87106, USA. NR 9 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 JUN PY 1992 VL 39 IS 3 BP 352 EP 356 DI 10.1109/23.277516 PN 1 PG 5 WC Engineering, Electrical & Electronic; Nuclear Science & Technology SC Engineering; Nuclear Science & Technology GA JA320 UT WOS:A1992JA32000005 ER PT J AU MCNULTY, PJ BEAUVAIS, WJ ROTH, DR LYNCH, JE KNUDSON, AR STAPOR, WJ AF MCNULTY, PJ BEAUVAIS, WJ ROTH, DR LYNCH, JE KNUDSON, AR STAPOR, WJ TI MICROBEAM ANALYSIS OF MOS CIRCUITS SO IEEE TRANSACTIONS ON NUCLEAR SCIENCE LA English DT Article; Proceedings Paper CT 1ST EUROPEAN CONF ON RADIATION AND ITS EFFECTS ON DEVICES AND SYSTEMS ( RADECS 91 ) CY SEP 09-12, 1991 CL LA GRANDE MOTTE, FRANCE AB Irradiation of MOS SRAMs by energetic heavy ions results in pulses on the power lines of the device. Pulse-height analysis shown a series of peaks when the irradiation consist of identical particles incident in the same direction. Analysis through a microbeam shows that the pulses are generated by traversals of the p-n junctions making up the transistors of the device. Junctions in the memory array were found to dominate the spectrum from a CMOS device while those of the support circuitry dominate the spectrum from a DRAM. C1 USN,RES LAB,WASHINGTON,DC 20375. RP MCNULTY, PJ (reprint author), CLEMSON UNIV,DEPT PHYS & ASTRON,CLEMSON,SC 29634, USA. NR 3 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 JUN PY 1992 VL 39 IS 3 BP 431 EP 435 DI 10.1109/23.277532 PN 1 PG 5 WC Engineering, Electrical & Electronic; Nuclear Science & Technology SC Engineering; Nuclear Science & Technology GA JA320 UT WOS:A1992JA32000021 ER PT J AU KAMGARPARSI, B KAMGARPARSI, B AF KAMGARPARSI, B KAMGARPARSI, B TI QUANTIZATION-ERROR IN HEXAGONAL SENSORY CONFIGURATIONS SO IEEE TRANSACTIONS ON PATTERN ANALYSIS AND MACHINE INTELLIGENCE LA English DT Letter DE AVERAGE ERROR; ERROR DISTRIBUTION; HEXAGONAL PIXEL; QUANTIZATION ERROR; SPATIAL SAMPLING; SQUARE PIXEL AB Hexagonal spatial sampling is used widely in image and signal processing. However, no rigorous treatment of the quantization error due to hexagonal sampling has appeared in the literature. In this paper, we develop mathematical tools for estimating quantization error in hexagonal sensory configurations. These include analytic expressions for the average error and the error distribution of a function of an arbitrary number of independently quantized variables. These two quantities are essential for assessing the reliability of a given algorithm. They can also be used to compare the relative sensitivity of a particular algorithm to quantization error for hexagonal and other spatial samplings, e.g., square, and can have an impact on sensor design. Furthermore, we show that the ratio of hexagonal error to square error is bounded between 0.90 and 1.05. RP USN, RES LAB, WASHINGTON, DC 20375 USA. NR 17 TC 3 Z9 3 U1 0 U2 0 PU IEEE COMPUTER SOC PI LOS ALAMITOS PA 10662 LOS VAQUEROS CIRCLE, PO BOX 3014, LOS ALAMITOS, CA 90720-1314 USA SN 0162-8828 EI 1939-3539 J9 IEEE T PATTERN ANAL JI IEEE Trans. Pattern Anal. Mach. Intell. PD JUN PY 1992 VL 14 IS 6 BP 665 EP 671 DI 10.1109/34.141556 PG 7 WC Computer Science, Artificial Intelligence; Engineering, Electrical & Electronic SC Computer Science; Engineering GA HX546 UT WOS:A1992HX54600006 ER PT J AU PARK, GS GRANATSTEIN, VL PARK, SY ARMSTRONG, CM GANGULY, AK AF PARK, GS GRANATSTEIN, VL PARK, SY ARMSTRONG, CM GANGULY, AK TI EXPERIMENTAL-STUDY OF EFFICIENCY OPTIMIZATION IN A 3-CAVITY GYROKLYSTRON AMPLIFIER SO IEEE TRANSACTIONS ON PLASMA SCIENCE LA English DT Article AB An experimental study quantifying the effects of both penultimate cavity tuning and magnetic field profiling on the saturated efficiency of a three-cavity gyroklystron amplifier has been performed at a frequency of 4.5 GHz. As predicted by theory, it is observed that the penultimate cavity detuning in the gyroklystron is in the opposite direction from a conventional klystron for enhanced efficiency operation. This is a result of the opposite energy dependence of the bunching mechanism for the two interactions. Magnetic field profiling has also been shown to have a very strong effect on the amplifier efficiency, both through beam loading effects in detuning the penultimate cavity and through enhanced energy extraction in the output cavity. The measured efficiency of the gyroklystron is observed to improve from 5% to 21% by profiling the magnetic field along the device, and then from 21% to 29% by penultimate cavity detuning with an optimized magnetic field profile. Comparison with theory shows reasonable agreement. C1 POHANG INST SCI & TECHNOL,DEPT PHYS,POHANG,SOUTH KOREA. UNIV MARYLAND,PLASMA RES LAB,COLLEGE PK,MD 20742. USN,RES LAB,WASHINGTON,DC 20375. RP PARK, GS (reprint author), OMEGA P INC,NEW HAVEN,CT 06520, USA. RI Park, Gunsik/A-1415-2014 NR 23 TC 8 Z9 8 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 JUN PY 1992 VL 20 IS 3 BP 224 EP 231 DI 10.1109/27.142823 PG 8 WC Physics, Fluids & Plasmas SC Physics GA JA870 UT WOS:A1992JA87000015 ER PT J AU HAFIZI, B SEO, Y GOLD, SH MANHEIMER, WM SPRANGLE, P AF HAFIZI, B SEO, Y GOLD, SH MANHEIMER, WM SPRANGLE, P TI ANALYSIS OF THE DEFLECTION SYSTEM FOR A MAGNETIC-FIELD-IMMERSED MAGNICON AMPLIFIER SO IEEE TRANSACTIONS ON PLASMA SCIENCE LA English DT Article AB A linear analysis of the electron-beam deflection system in a magnicon is presented. The system consists of identical cavities, one driven and the remainder passive, separated by a drift space and immersed in an axial magnetic field. The cavities contain a rotating TM110 mode. The length of each cavity is pi-upsilon(z)/omega, and that of the drift space is pi-upsilon(z)/omega(c), where omega is the RF frequency, omega(c) is the relativistic gyrofrequency in the guide field, and upsilon(z) is the mean axial velocity of the beam electrons. The linearized electron orbits are obtained for arbitrary initial axial velocity, radial coordinate, and magnetic field. The small-signal gain and the phase shift are determined. The special case where omega(c)/omega = 2 has unique features and is discussed in detail. For example, this special case gives rise to a constant phase of the electrons relative to that of the TM110 mode, and the passive cavity may be driven optimally for a given beam current. For the NRL magnicon design, a power gain of 10 dB per passive cavity if feasible. Results from numerical modeling of a magnicon with two passive cavities are presented. Operation of the output cavity at the fundamental and higher harmonics of the input drive frequency is briefly discussed. C1 FM TECHNOL INC,FAIRFAX,VA 22032. USN,RES LAB,DIV PLASMA PHYS,BEAM PHYS BRANCH,WASHINGTON,DC 20375. RP HAFIZI, B (reprint author), ICARUS RES,BETHESDA,MD 20814, USA. NR 7 TC 17 Z9 17 U1 0 U2 0 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0093-3813 J9 IEEE T PLASMA SCI JI IEEE Trans. Plasma Sci. PD JUN PY 1992 VL 20 IS 3 BP 232 EP 239 DI 10.1109/27.142824 PG 8 WC Physics, Fluids & Plasmas SC Physics GA JA870 UT WOS:A1992JA87000016 ER PT J AU FREUND, HP GANGULY, AK AF FREUND, HP GANGULY, AK TI NONLINEAR SIMULATION OF A HIGH-POWER, COLLECTIVE FREE-ELECTRON LASER SO IEEE TRANSACTIONS ON PLASMA SCIENCE LA English DT Article ID WAVE REFRACTIVE-INDEX; HIGH-GAIN; MICROWAVE-RADIATION; MAGNETIC-FIELDS; 1ST OPERATION; LONG-PULSE; EFFICIENCY; AMPLIFIERS; WIGGLER; RAMAN AB A comparison is described between the three-dimensional nonlinear analysis and simulation code, ARACHNE, and a recent 33.4-GHz, collective, free-electron laser amplifier experiment at MIT. The experiment has demonstrated power levels of 61 MW (almost-equal-to 27% efficiency) without recourse to tapered magnetic fields, using a 750-keV/300-A electron beam with a nominal axial energy spread of 1.5% propagating through a cylindrical drift tube in the presence of a helical wiggler (B(w) less-than-or-equal-to 1.8 kG, lambda(w) = 3.18 cm) and an axial guide magnetic field (B0 less-than-or-equal-to 12 kG). Significant differences in the character of the emission were found based upon the direction of the guide magnetic field. When the wiggler and guide fields were parallel, observed power levels reached approximately 4 MW for both the strong and weak guide field regimes, but vanished in the neighborhood of the magnetic resonance (when the Larmor and wiggler periods are comparable). In this case, resonance refers to the enhancement of the transverse wiggle-induced velocity, and the reduction in the emission is due to the fact that the electron beam cannot propagate in this regime due to orbital instabilities. However, the maximum power was observed in the reversed field case when the wiggler and guide fields were antiparallel. In this case, no resonant enhancement in the transverse velocity is expected to occur; however, a significant reduction in the output power was found to occur in the neighborhood of the antiresonance. The ARACHNE simulation is in substantial agreement with the experiment. In the reversed field case, the simulation shows peak power levels of 60 MW at the nominal axial energy spread of the experiment, as well as providing good correspondence with the power reduction at the anti-resonance. The source of this power reduction appears to be a previously unsuspected effect on the electron orbits due to the wiggler inhomogeneity. Agreement with the much lower power levels found when the wiggler and guide fields are parallel, however, requires the assumption of a substantial increase in the energy spread of the beam. C1 USN,RES LAB,WASHINGTON,DC 20375. RP FREUND, HP (reprint author), SCI APPLICAT INT CORP,MCLEAN,VA 22102, USA. NR 44 TC 29 Z9 29 U1 0 U2 1 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0093-3813 J9 IEEE T PLASMA SCI JI IEEE Trans. Plasma Sci. PD JUN PY 1992 VL 20 IS 3 BP 245 EP 255 DI 10.1109/27.142826 PG 11 WC Physics, Fluids & Plasmas SC Physics GA JA870 UT WOS:A1992JA87000018 ER PT J AU MUKHERJEE, R NAKAMURA, Y AF MUKHERJEE, R NAKAMURA, Y TI FORMULATION AND EFFICIENT COMPUTATION OF INVERSE DYNAMICS OF SPACE ROBOTS SO IEEE TRANSACTIONS ON ROBOTICS AND AUTOMATION LA English DT Note ID MECHANICAL MANIPULATORS AB A free-flying space robot is expected to perform various tasks for the construction and maintenance of space structures. Such a robotic system has kinematic and dynamic features that differ from those fixed on the earth mainly because of the momentum constraints that govern its motion. This paper presents the solution to the inverse dynamics problem of a space robotic system, in the presence of external generalized forces. While solving for the inverse dynamics, the computations for the inverse kinematics are considered simultaneously, and both computations are developed on the basis of momentum constraints. An efficient computational scheme for the inverse dynamics problem is then established. We also discuss an intrinsic feature of space robotic systems that can be utilized to reduce the computational time by parallel recursion. We conclude the paper with a discussion on the importance of the role of momentum constraints in the solution of inverse dynamics. C1 USN,POSTGRAD SCH,DEPT MECH ENGN,MONTEREY,CA 93940. RP MUKHERJEE, R (reprint author), UNIV TOKYO,DEPT MECHANOINFORMAT,7-3-1 HONGO,BUNKYO KU,TOKYO 113,JAPAN. RI Mukherjee, Ranjan/A-7518-2009 NR 14 TC 11 Z9 12 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 1042-296X J9 IEEE T ROBOTIC AUTOM JI IEEE Trans. Robot. Autom. PD JUN PY 1992 VL 8 IS 3 BP 400 EP 406 DI 10.1109/70.143357 PG 7 WC Automation & Control Systems; Engineering, Electrical & Electronic; Robotics SC Automation & Control Systems; Engineering; Robotics GA JA551 UT WOS:A1992JA55100010 ER PT J AU FITZGERALD, R ANDERSON, W AF FITZGERALD, R ANDERSON, W TI SPECTRAL DISTORTION IN SAMPLING RATE CONVERSION BY ZERO-ORDER POLYNOMIAL INTERPOLATION SO IEEE TRANSACTIONS ON SIGNAL PROCESSING LA English DT Letter AB For such applications as digital beamforming in sonar and sampling rate conversion in digital audio systems there is interest in fast, approximate interpolation techniques. Computationally the simplest of these is to approximate the desired time series sample by the available sample which is nearest in time. This procedure is variously known as sample-and-hold interpolation, zero-order polynomial interpolation, or selective subsampling. The effect of this approximation on signal-to-noise ratio has already been addressed in the literature. This correspondence extends those previous analyses by deriving the spectral characteristics of the noise generated. It is shown that, because the timing errors involved in zero-order polynomial interpolation are not random, the effect on the input spectrum is not simply to broaden it by the transfer of power from narrow-band signal components to broad-band noise, but is instead to distort it by the transfer of power from narrow-band signals to narrow-band noise or distortion components. RP FITZGERALD, R (reprint author), USN,RES LAB,DEPT NAVY,CODE 5120,WASHINGTON,DC 20375, USA. NR 11 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 1053-587X J9 IEEE T SIGNAL PROCES JI IEEE Trans. Signal Process. PD JUN PY 1992 VL 40 IS 6 BP 1576 EP 1579 DI 10.1109/78.139264 PG 4 WC Engineering, Electrical & Electronic SC Engineering GA HW713 UT WOS:A1992HW71300031 ER PT J AU RAMESH, B DHAR, V AF RAMESH, B DHAR, V TI SUPPORTING SYSTEMS-DEVELOPMENT BY CAPTURING DELIBERATIONS DURING REQUIREMENTS ENGINEERING SO IEEE TRANSACTIONS ON SOFTWARE ENGINEERING LA English DT Article DE PROCESS KNOWLEDGE; GROUP DESIGN; DESIGN RATIONALE; STAKEHOLDER SUPPORT; REQUIREMENTS ENGINEERING; ARGUMENTATION; CONCEPTUAL MODELING; REASON MAINTENANCE ID INFORMATION AB Support for various stakeholders involved in software projects (designers, maintenance personnel, project managers and executives, end users) can be provided by capturing the history about design decisions in the early stages of the systems development life cycle in a structured manner. Much of this knowledge, which we call the process knowledge, involving the deliberation on alternative requirements and design decisions, is lost in the course of designing and changing such systems. Using an empirical study of problem-solving behavior of individual and groups of information systems professionals, we have developed a conceptual model called REMAP (REpresentation and MAintenance of Process knowledge) that relates process knowledge to the objects that are created during the requirements engineering process. This model includes as part of it the Issue Based Information Systems (IBIS) method, which is designed to record the argumentation related to deliberations. We have implemented a prototype of an environment based on our model that can provide assistance to the various stakeholders involved in the design and management of large systems. C1 NYU,LEONARD N STERN SCH BUSINESS,NEW YORK,NY 10003. RP RAMESH, B (reprint author), USN,POSTGRAD SCH,MONTEREY,CA 93943, USA. RI Ramesh, Balasubramaniam/C-2565-2008; Rocha, Fabio/M-4694-2014 OI Rocha, Fabio/0000-0002-0512-5406 NR 45 TC 105 Z9 105 U1 2 U2 4 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 JUN PY 1992 VL 18 IS 6 BP 498 EP 510 DI 10.1109/32.142872 PG 13 WC Computer Science, Software Engineering; Engineering, Electrical & Electronic SC Computer Science; Engineering GA HY535 UT WOS:A1992HY53500005 ER PT J AU WILSON, JL TURBAN, E ZVIRAN, M AF WILSON, JL TURBAN, E ZVIRAN, M TI INFORMATION-SYSTEMS SECURITY - A MANAGERIAL PERSPECTIVE SO INTERNATIONAL JOURNAL OF INFORMATION MANAGEMENT LA English DT Article ID COMPUTER SECURITY; KEY ISSUES AB Information security has been recognized as one of the major issues of importance in the management of organizational information systems. Losses resulting from computer abuse and errors are substantial, and information systems managers continue to cite security and control as a key management issue. This paper presents the various dimensions of the problem, suggests specific steps that can be taken to improve the management of information security, and points to several research directions. C1 EASTERN ILLINOIS UNIV,CHARLESTON,IL 61920. USN,POSTGRAD SCH,MONTEREY,CA 93943. RP WILSON, JL (reprint author), WARSALL INSURANCE CO,WARSALL,WI 54401, USA. NR 43 TC 2 Z9 2 U1 0 U2 2 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0268-4012 J9 INT J INFORM MANAGE JI Int. J. Inf. Manage. PD JUN PY 1992 VL 12 IS 2 BP 105 EP 119 DI 10.1016/0268-4012(92)90017-K PG 15 WC Information Science & Library Science SC Information Science & Library Science GA HZ158 UT WOS:A1992HZ15800002 ER PT J AU KOBUS, DA LEWANDOWSKI, LJ AF KOBUS, DA LEWANDOWSKI, LJ TI THE EFFECTS OF REDUNDANCY IN BIMODAL WORD-PROCESSING SO INTERNATIONAL JOURNAL OF PSYCHOLOGY LA English DT Meeting Abstract C1 USN,HLTH RES CTR,SAN DIEGO,CA 92152. SYRACUSE UNIV,SYRACUSE,NY 13244. NR 0 TC 0 Z9 0 U1 0 U2 2 PU PSYCHOLOGY PRESS PI HOVE PA 27 CHURCH RD, HOVE, EAST SUSSEX, ENGLAND BN3 2FA SN 0020-7594 J9 INT J PSYCHOL JI Int. J. Psychol. PD JUN-AUG PY 1992 VL 27 IS 3-4 BP 61 EP 61 PG 1 WC Psychology, Multidisciplinary SC Psychology GA JF420 UT WOS:A1992JF42000306 ER PT J AU ALDERTON, DL LARSON, GE AF ALDERTON, DL LARSON, GE TI DEVELOPMENT OF A HALF-LENGTH VERSION OF THE ADVANCED PROGRESSIVE MATRICES SO INTERNATIONAL JOURNAL OF PSYCHOLOGY LA English DT Meeting Abstract C1 USN,CTR PERSONNEL RES & DEV,SAN DIEGO,CA 92132. NR 0 TC 0 Z9 0 U1 0 U2 0 PU PSYCHOLOGY PRESS PI HOVE PA 27 CHURCH RD, HOVE, EAST SUSSEX, ENGLAND BN3 2FA SN 0020-7594 J9 INT J PSYCHOL JI Int. J. Psychol. PD JUN-AUG PY 1992 VL 27 IS 3-4 BP 378 EP 378 PG 1 WC Psychology, Multidisciplinary SC Psychology GA JF420 UT WOS:A1992JF42002026 ER PT J AU NACHTIGALL, PE PAWLOSKI, JL AF NACHTIGALL, PE PAWLOSKI, JL TI RISSOS DOLPHIN VISUAL-ACUITY IN AIR SO INTERNATIONAL JOURNAL OF PSYCHOLOGY LA English DT Meeting Abstract C1 USN,CTR OCEAN SYST,KAILUA,HI 96734. SCI APPLICAT INT CORP,KAILVA,HI. NR 0 TC 0 Z9 0 U1 0 U2 0 PU PSYCHOLOGY PRESS PI HOVE PA 27 CHURCH RD, HOVE, EAST SUSSEX, ENGLAND BN3 2FA SN 0020-7594 J9 INT J PSYCHOL JI Int. J. Psychol. PD JUN-AUG PY 1992 VL 27 IS 3-4 BP 384 EP 384 PG 1 WC Psychology, Multidisciplinary SC Psychology GA JF420 UT WOS:A1992JF42002066 ER PT J AU LOONEY, RE AF LOONEY, RE TI MANPOWER OPTIONS IN A SMALL LABOR-IMPORTING STATE - THE INFLUENCE OF ETHNIC-COMPOSITION ON KUWAITS DEVELOPMENT SO INTERNATIONAL MIGRATION LA English DT Article C1 USN,POSTGRAD SCH,MONTEREY,CA 93940. NR 14 TC 2 Z9 2 U1 0 U2 1 PU INT ORGANIZATION MIGRATION PI GENEVA 19 PA PO BOX 71, CH-1211 GENEVA 19, SWITZERLAND SN 0020-7985 J9 INT MIGR JI Int. Migr. PD JUN PY 1992 VL 30 IS 2 BP 175 EP 200 PG 26 WC Demography SC Demography GA JP164 UT WOS:A1992JP16400004 PM 12317558 ER PT J AU LOVE, RW AF LOVE, RW TI TO SHINING SEA - A HISTORY OF THE UNITED-STATES-NAVY 1775-1991 - HOWARTH,S SO JOURNAL OF AMERICAN HISTORY LA English DT Book Review RP LOVE, RW (reprint author), USN ACAD,ANNAPOLIS,MD 21402, USA. NR 1 TC 0 Z9 0 U1 0 U2 0 PU ORGANIZATION AMER HISTORIANS PI BLOOMINGTON PA 112 N BRYAN ST, BLOOMINGTON, IN 47408 SN 0021-8723 J9 J AM HIST JI J. Am. Hist. PD JUN PY 1992 VL 79 IS 1 BP 244 EP 245 DI 10.2307/2078503 PG 2 WC History SC History GA HY817 UT WOS:A1992HY81700031 ER PT J AU COTELL, CM CHRISEY, DB GRABOWSKI, KS SPRAGUE, JA GOSSETT, CR AF COTELL, CM CHRISEY, DB GRABOWSKI, KS SPRAGUE, JA GOSSETT, CR TI PULSED LASER DEPOSITION OF HYDROXYLAPATITE THIN-FILMS ON TI-6AL-4V SO JOURNAL OF APPLIED BIOMATERIALS LA English DT Article AB Pulsed laser deposition was used to deposit thin films of calcium hydroxylapatite (Ca10(PO4)6(OH)2), or HA, on polished substrates of Ti-6Al-4V. Thin films of pure, crystalline HA, uncontaminated by other calcium phosphate phases, were deposited over a range of temperatures between 400 and 800-degrees-C. The HA films were polycrystalline with a preferred (001) crystallographic orientation, as determined by transmission electron microscopy and x-ray diffraction. Adhesion of the HA films to the Ti-6Al-4V substrates was excellent when films were deposited at temperatures less-than-or-equal-to 600-degrees-C; in a scratch test, mean pressures of ca. 10(10) Nm-2 produced conformational cracking in a film deposited at 600-degrees-C, but no decohesion from the substrates. C1 SACHS FREEMAN ASSOCIATES INC,LANDOVER,MD. RP COTELL, CM (reprint author), USN,RES LAB,CODE 4670,WASHINGTON,DC 20375, USA. NR 11 TC 156 Z9 158 U1 1 U2 10 PU JOHN WILEY & SONS INC PI NEW YORK PA 605 THIRD AVE, NEW YORK, NY 10158-0012 SN 1045-4861 J9 J APPL BIOMATER JI J. Appl. Biomater. PD SUM PY 1992 VL 3 IS 2 BP 87 EP 93 DI 10.1002/jab.770030204 PG 7 WC Engineering, Biomedical; Materials Science, Biomaterials SC Engineering; Materials Science GA HT988 UT WOS:A1992HT98800003 ER PT J AU FUNG, YT AF FUNG, YT TI NONAXISYMMETRIC WAVES OF A STRATIFIED VERTICAL VORTEX SO JOURNAL OF APPLIED MECHANICS-TRANSACTIONS OF THE ASME LA English DT Article ID STABILITY; MOTIONS; FLUIDS AB The interfacial conditions for a cylindrical and an axial vortex sheet or thin fluid layer are obtained for a general class of vortex flows in a radius and gravity-stratified environment. The flow is assumed to be inviscid and incompressible. No Boussinesq approximation is required. In addition to the kinematic and dynamic conditions that the flow has to satisfy in the centrifugal and gravitational directions, a third condition, which restrains the interaction of the centrifugal and gravitational force fields, has to be imposed on those vortex sheets. This is consistent with the previous derived criteria for this type of vortex motions, in which a third condition based on pressure and force balance must be satisfied. Nonaxisymmetric instability for a special flow profile is examined and the stability boundary is obtained to show the behavior of this type of stratified vertical vortex. The results provide us with some information on the instability mechanism for the generation of the horizontal vortices in the ocean and for the spiral type of vortex breakdown in tornadoes and waterspouts in the atmosphere. RP FUNG, YT (reprint author), USN,RES LAB,CTR ADV SPACE SENSING,WASHINGTON,DC 20375, USA. NR 11 TC 0 Z9 0 U1 1 U2 5 PU ASME-AMER SOC MECHANICAL ENG PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 SN 0021-8936 J9 J APPL MECH-T ASME JI J. Appl. Mech.-Trans. ASME PD JUN PY 1992 VL 59 IS 2 BP 445 EP 449 DI 10.1115/1.2899540 PN 1 PG 5 WC Mechanics SC Mechanics GA JA696 UT WOS:A1992JA69600027 ER PT J AU VARDIMAN, RG AF VARDIMAN, RG TI THE FORMATION AND ANNEALING OF DISLOCATION DAMAGE FROM HIGH-DOSE SELF-ION IMPLANTATION OF ALUMINUM SO JOURNAL OF APPLIED PHYSICS LA English DT Article ID DEFORMED ALUMINUM; IRRADIATION; RECOVERY; METALS AB Quantitative electron channeling and weak-beam transmission electron microscopy (TEM) measurements of dislocation density have been used to study the formation and annealing of the dislocation network in self-ion-implanted aluminum. The channeling linewidth is found to be proportional to the dislocation density. Several mathematical expressions for the dislocation network growth are examined. One by Igata et al. [in Effects of Radiation on Materials: Proceedings of the 10th International Symposium, edited by D. Kramer, H. R. Brager, and J. S. Perrin, STP 725 (ASTM, Philadelphia, 1980), p. 627] is found to describe the implantation data accurately. This model has a linear growth term and terms for dislocation loss due to surface effects and recovery. The fit is insensitive to the relative importance of the two loss terms. Annealing is found to occur in two stages; roughly one third of the dislocation density is gone by 300-degrees-C, corresponding to typical recovery processes, while the remaining network is stable to about 500-degrees-C. RP VARDIMAN, RG (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 27 TC 1 Z9 1 U1 0 U2 0 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0021-8979 J9 J APPL PHYS JI J. Appl. Phys. PD JUN 1 PY 1992 VL 71 IS 11 BP 5386 EP 5390 DI 10.1063/1.350559 PG 5 WC Physics, Applied SC Physics GA HX256 UT WOS:A1992HX25600016 ER PT J AU BERMUDEZ, VM AF BERMUDEZ, VM TI STUDY OF THE INITIAL FORMATION OF SILICON-CARBIDE BY REACTION OF TETRAETHYL SILANE WITH SILICON SO JOURNAL OF APPLIED PHYSICS LA English DT Article ID CHEMICAL VAPOR-DEPOSITION; MEAN FREE PATHS; INFRARED-SPECTROSCOPY; SURFACE; FILMS AB The growth of SiC films on Si by reaction with tetraethyl silane (SiEt4) has been studied using Auger and electron energy-loss spectroscopies, low-energy electron diffraction, and external-reflection infrared reflection absorption spectroscopy (IRRAS). IRRAS is used to monitor the chemisorption of the reagent molecule on polycrystalline Si at substrate temperatures below the point where complete dissociation occurs. The electron techniques are used to characterize the structure and composition of SixC1-x (0 less-than-or-equal-to x less-than-or-equal-to 1) layers formed on Si(100) at higher temperatures during dosing with SiEt4. Near room temperature, IRRAS data indicate adsorption of undissociated -C2H5 groups with the C-C bond oriented nearly normal to the surface. Under growth conditions, the relative rates of deposition and indiffusion of C control the stoichiometry of the initial SixC1-x phase. At lower temperatures (approximately 750-1000 K), a partially noncarbidic phase occurs. Annealing this surface or dosing the clean surface at higher temperature leads to formation of a SiC layer which then acts to slow further diffusion. Subsequent layer growth occurs mainly by pyrolysis of the SiEt4 molecule. However, the underlying Si substrate continues to function as either a C sink or a Si source. RP BERMUDEZ, VM (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 36 TC 3 Z9 3 U1 1 U2 2 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0021-8979 J9 J APPL PHYS JI J. Appl. Phys. PD JUN 1 PY 1992 VL 71 IS 11 BP 5450 EP 5459 DI 10.1063/1.350516 PG 10 WC Physics, Applied SC Physics GA HX256 UT WOS:A1992HX25600026 ER PT J AU HESSLINK, RL DALESANDRO, MM ARMSTRONG, DW REED, HL AF HESSLINK, RL DALESANDRO, MM ARMSTRONG, DW REED, HL TI HUMAN COLD AIR HABITUATION IS INDEPENDENT OF THYROXINE AND THYROTROPIN SO JOURNAL OF APPLIED PHYSIOLOGY LA English DT Article DE THYROID HORMONES; CATECHOLAMINES; HUMAN COLD EXPOSURE ID BROWN ADIPOSE-TISSUE; THYROID-HORMONE; TRIIODOTHYRONINE; EXPOSURE; RESPONSES; THERMOGENESIS; CATECHOLAMINE; PITUITARY AB Thyroxine (T4) is required in species possessing brown adipose tissue (BAT) for the maintenance of cold tolerance and adaptation. In humans, who possess negligible quantities of BAT, the importance of T4 has not been demonstrated. We studied the effects of decreased serum T4 and thyrotropin (TSH) on human cold habituation after repeated cold air exposures. Eight men (T3+) received a single daily dose of triiodothyronine (T3; 30-mu-g/day), and another eight men (T3-) received a placebo. All 16 normal thyroid men underwent a standardized cold air test (SCAT) under basal conditions in January and again in March after eighty 30-min 4.4-degrees-C air exposures (10/wk). Measurements of basal metabolic rate (BMR), O2 consumption (VO2), mean arterial pressure (MAP), plasma norepinephrine (NE), serum TSH, free and total T4, and free and total T3 were repeated before and after 8 wk of exposure. TSH, free T4, and total T4 were 50% lower for T3+ than for T3- subjects. Total and free T3 were not different between groups. BMR was unchanged after habituation, whereas the cold-stimulated VO2, MAP, and NE were significantly reduced for all subjects in March. The relationship between VO2 and NE (r2 = 0.44, P < 0.001) during the initial SCAT was unchanged with habituation. We suggest that human cold habituation is independent of major changes in circulating T4 and TSH. C1 USN,MED RES INST,DIV BIOCHEM,THERMAL STRESS PROGRAM,BETHESDA,MD 20814. NR 35 TC 28 Z9 30 U1 0 U2 1 PU AMER PHYSIOLOGICAL SOC PI BETHESDA PA 9650 ROCKVILLE PIKE, BETHESDA, MD 20814 SN 8750-7587 J9 J APPL PHYSIOL JI J. Appl. Physiol. PD JUN PY 1992 VL 72 IS 6 BP 2134 EP 2139 PG 6 WC Physiology; Sport Sciences SC Physiology; Sport Sciences GA HZ317 UT WOS:A1992HZ31700013 PM 1629066 ER PT J AU KIRSCHENBAUM, SS AF KIRSCHENBAUM, SS TI INFLUENCE OF EXPERIENCE ON INFORMATION-GATHERING STRATEGIES SO JOURNAL OF APPLIED PSYCHOLOGY LA English DT Article ID PHYSICS PROBLEMS; PERCEPTION; KNOWLEDGE; JUDGMENT; EXPERT AB Decision making and situation understanding are related to information-gathering strategies used by experienced, intermediate, and novice decision makers. Differences according to level of experience were predicted for seven strategies. These predictions were tested in a process-tracing experiment employing a submarine search scenario. The subjects were three groups of naval officers ranging in experience from former commanding officers to students in the first course for potential submarine officers. Differences were found among the groups in use of information-gathering strategies, situation understanding, and decision accuracy. The results are discussed in terms of the influence of experience on the decision process and implications for decision aiding. RP KIRSCHENBAUM, SS (reprint author), USN,UNDERSEA WARFARE CTR,CODE 2212,BLDG 1171-1,NEWPORT,RI 02841, USA. NR 32 TC 32 Z9 32 U1 2 U2 8 PU AMER PSYCHOLOGICAL ASSOC PI WASHINGTON PA 750 FIRST ST NE, WASHINGTON, DC 20002-4242 SN 0021-9010 J9 J APPL PSYCHOL JI J. Appl. Psychol. PD JUN PY 1992 VL 77 IS 3 BP 343 EP 352 DI 10.1037//0021-9010.77.3.343 PG 10 WC Psychology, Applied; Management SC Psychology; Business & Economics GA HY002 UT WOS:A1992HY00200012 ER PT J AU PANCAKE, SJ HOLT, GD MELLOUK, S HOFFMAN, SL AF PANCAKE, SJ HOLT, GD MELLOUK, S HOFFMAN, SL TI MALARIA SPOROZOITES AND CIRCUMSPOROZOITE PROTEINS BIND SPECIFICALLY TO SULFATED GLYCOCONJUGATES SO JOURNAL OF CELL BIOLOGY LA English DT Article ID THROMBOSPONDIN; GLYCOPROTEIN; SEQUENCE; HEPARIN AB Circumsporozoite (CS) proteins, which densely coat malaria (Plasmodia) sporozoites, contain an amino acid sequence that is homologous to segments in other proteins which bind specifically to sulfated glycoconjugates. The presence of this homology suggests that sporozoites and CS proteins may also bind sulfated glycoconjugates. To test this hypothesis, recombinant P. yoelii CS protein was examined for binding to sulfated glycoconjugate-Sepharoses. CS protein bound avidly to heparin-, fucoidan-, and dextran sulfate-Sepharose, but bound comparatively poorly to chondroitin sulfate A- or C-Sepharose. CS protein also bound with significantly lower affinity to a heparan sulfate biosynthesis-deficient mutant cell line compared with the wild-type line, consistent with the possibility that the protein also binds to sulfated glycoconjugates on the surfaces of cells. This possibility is consistent with the observation that CS protein binding to hepatocytes, cells invaded by sporozoites during the primary stage of malaria infection, was inhibited by fucoidan, pentosan polysulfate, and heparin. The effects of sulfated glycoconjugates on sporozoite infectivity were also determined. P berghei sporozoites bound specifically to sulfatide (galactosyl[3-sulfate]-beta-1-1ceramide), but not to comparable levels of cholesterol-3-sulfate, or several examples of neutral glycosphingolipids, gangliosides, or phospholipids. Sporozoite invasion into hepatocytes was inhibited by fucoidan, heparin, and dextran sulfate, paralleling the observed binding of CS protein to the corresponding Sepharose derivatives. These sulfated glycoconjugates blocked invasion by inhibiting an event occurring within 3 h of combining sporozoites and hepatocytes. Sporozoite infectivity in mice was significantly inhibited by dextran sulfate 500,000 and fucoidan. Taken together, these data indicate that CS proteins bind selectively to certain sulfated glycoconjugates, that sporozoite infectivity can be inhibited by such compounds, and that invasion of host hepatocytes by sporozoites may involve interactions with these types of compounds. C1 UNIV MARYLAND,SCH MED,CTR VACCINE DEV,DEPT MED,DIV GEOG MED,BALTIMORE,MD 21201. NIADDKD,LAB STRUCT BIOL,BETHESDA,MD 20892. RP PANCAKE, SJ (reprint author), USN,MED RES INST,MALARIA PROGRAM,BETHESDA,MD 20889, USA. NR 24 TC 141 Z9 141 U1 0 U2 6 PU ROCKEFELLER UNIV PRESS PI NEW YORK PA 1114 FIRST AVE, 4TH FL, NEW YORK, NY 10021 SN 0021-9525 J9 J CELL BIOL JI J. Cell Biol. PD JUN PY 1992 VL 117 IS 6 BP 1351 EP 1357 DI 10.1083/jcb.117.6.1351 PG 7 WC Cell Biology SC Cell Biology GA HX634 UT WOS:A1992HX63400020 PM 1607393 ER PT J AU SOLIMAN, AK BOTROS, BAM WATTS, DM AF SOLIMAN, AK BOTROS, BAM WATTS, DM TI EVALUATION OF A COMPETITIVE ENZYME-IMMUNOASSAY FOR DETECTION OF COXIELLA-BURNETII ANTIBODY IN ANIMAL SERA SO JOURNAL OF CLINICAL MICROBIOLOGY LA English DT Note ID PROTEIN-A; Q-FEVER; VIRUS AB A competitive enzyme immunoassay (CEIA) was established and compared with other serological techniques for detecting Coxiella burnetii antibody in camels, goats, and sheep. This technique was evaluated because a conjugated anti-camel immunoglobulin was not available to serve as a direct signal for the demonstration of antigen-antibody reaction. A C. burnetii antibody-positive human serum and a peroxidase-conjugated anti-human immunoglobulin G were used as an indicator system competing against antibody in animal serum or as an indicator of the absence of antibody. Sera were considered antibody positive when the A414 of the test sera plus the competing positive antibody was less-than-or-equal-to 50% of the A414 of the negative-control serum plus the competing antibody. Antibody to C. burnetii was repeatedly demonstrated in 66% of camel serum samples (n = 200) by the CEIA. Among 48 camel serum samples, 71% were positive for antibody by CEIA versus 65% by EIA using peroxidase-labeled protein A. The (CEIA detected C. burnetii antibody in 63% of sheep serum samples (n = 40) and in 50% of goat serum samples (n = 96), while the indirect fluorescent-antibody technique detected antibody in 38% of sheep and 34% of goat serum samples and the EIA detected antibody in 50% of sheep and 35% of goat serum samples. These data indicate that the CEIA is a reliable and sensitive technique for demonstrating C. burnetii antibody in camels, sheep, and goats. RP SOLIMAN, AK (reprint author), USN,MED RES UNIT 3,DIV VIROL,CAIRO,EGYPT. NR 12 TC 13 Z9 13 U1 1 U2 2 PU AMER SOC MICROBIOLOGY PI WASHINGTON PA 1325 MASSACHUSETTS AVENUE, NW, WASHINGTON, DC 20005-4171 SN 0095-1137 J9 J CLIN MICROBIOL JI J. Clin. Microbiol. PD JUN PY 1992 VL 30 IS 6 BP 1595 EP 1597 PG 3 WC Microbiology SC Microbiology GA HU603 UT WOS:A1992HU60300046 PM 1624582 ER PT J AU MAURER, JH AF MAURER, JH TI THE ANGLO-GERMAN NAVAL RIVALRY AND INFORMAL ARMS-CONTROL, 1912-1914 SO JOURNAL OF CONFLICT RESOLUTION LA English DT Article ID COOPERATION AB The last stage of the Anglo-German naval arms race before the First World War provides a valuable case study for the evaluation of current theories about the development of cooperation between intensely competitive states. After 1912 the naval competition between Britain and Germany resembled a game of prisoners' dilemma, as decision makers in both countries concluded that they benefitted from reciprocal restraint in battleship-building programs. Another striking feature of the naval rivalry in this period is that a modified version of a tit-for-tat strategy, devised by none other than Winston Churchill, who then served as first lord of Britain's Admiralty, played a critical role in controlling the competition. This essay analyzes the domestic political, diplomatic, and strategic factors that promoted mutual restraint in the battleship-building programs of Britain and Germany. Another purpose of this essay is to explore the limits of cooperation and to examine why this informal understanding on naval armaments did not lead to a significant improvement in Anglo-German relations. RP MAURER, JH (reprint author), USN,COLL WAR,WASHINGTON,DC 20350, USA. NR 42 TC 5 Z9 5 U1 0 U2 5 PU SAGE PUBLICATIONS INC PI THOUSAND OAKS PA 2455 TELLER RD, THOUSAND OAKS, CA 91320 SN 0022-0027 J9 J CONFLICT RESOLUT JI J. Confl. Resolut. PD JUN PY 1992 VL 36 IS 2 BP 284 EP 308 DI 10.1177/0022002792036002004 PG 25 WC International Relations; Political Science SC International Relations; Government & Law GA HY466 UT WOS:A1992HY46600004 ER PT J AU LOONEY, RE AF LOONEY, RE TI ECONOMIC-DEVELOPMENT IN IRAQ - FACTORS UNDERLYING THE RELATIVE DETERIORATION OF HUMAN-CAPITAL FORMATION SO JOURNAL OF ECONOMIC ISSUES LA English DT Article; Proceedings Paper CT 1992 ANNUAL MEETING OF THE ASSOC FOR EVOLUTIONARY ECONOMICS CY JAN 02-05, 1992 CL NEW ORLEANS, LA SP ASSOC EVOLUTIONARY ECON RP LOONEY, RE (reprint author), USN,NATL SECUR AFFAIRS,WASHINGTON,DC 20350, USA. NR 9 TC 1 Z9 1 U1 0 U2 1 PU ASSOC EVOLUTIONARY ECONOMICS PI KNOXVILLE PA UNIV TENNESSEE, KNOXVILLE, DEPT OF ECONOMICS, KNOXVILLE, TN 37996-0550 SN 0021-3624 J9 J ECON ISSUES JI J. Econ. Issues PD JUN PY 1992 VL 26 IS 2 BP 615 EP 622 PG 8 WC Economics SC Business & Economics GA HZ912 UT WOS:A1992HZ91200028 ER PT J AU BODNER, SE AF BODNER, SE TI FUTURE-DIRECTIONS IN INERTIAL CONFINEMENT FUSION SO JOURNAL OF FUSION ENERGY LA English DT Article; Proceedings Paper CT SYMP ON FUTURE OPPORTUNITIES IN FUSION POWER DEVELOPMENT CY APR 09-10, 1992 CL PLEASANTON, CA SP FUS POWER ASSOC RP BODNER, SE (reprint author), USN,RES LAB,DIV PLASMA PHYS,4555 OVERLOOK AVE SW,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 JUN PY 1992 VL 11 IS 2 BP 73 EP 74 DI 10.1007/BF01080168 PG 2 WC Nuclear Science & Technology SC Nuclear Science & Technology GA KL600 UT WOS:A1992KL60000007 ER PT J AU CHATURVEDI, PK KESKINEN, MJ OSSAKOW, SL AF CHATURVEDI, PK KESKINEN, MJ OSSAKOW, SL TI HIGH-LATITUDE F-REGION IONOSPHERIC INTERCHANGE MODES IN THE PRESENCE OF POWERFUL RADIO-WAVES SO JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS LA English DT Article ID PARAMETRIC-EXCITATION; ELECTROMAGNETIC-WAVES; PLASMA INSTABILITIES; POLAR IONOSPHERE; SPREAD-F; IRREGULARITIES; SCINTILLATIONS; STRIATIONS; ARECIBO; TROMSO AB We examine the possibility of influencing medium scale size (0.1 approximately 10 km) interchange modes in the high-latitude F region ionosphere by a high-power. high-frequency (HF) electromagnetic ("pump") wave launched from the ground. The parametric coupling of interchange modes with the pump wave will occur near the critical layer where the pump frequency matches the local plasma frequency with the nonlinear Joule heating providing the dominant coupling mechanism. We find that the parametric excitation (or suppression) of the interchange process at high latitudes is possible, in the local approximation, for short wavelengths (k perpendicular-to L(N) greater than greater than 1. where k perpendicular-to and L(N) are the transverse wavenumber of the interchange mode and density gradient scalelength, respectively) using HF power densities (greater than or similar to 10(-6) W/m2) that are attainable by current ionospheric heater facilities. These power density estimates for longer wavelength interchange modes, i.e., for k perpendicular to L(N) less than or similar to 1, are increased. The results are discussed in light of previous and possible future ionospheric heating experiments. RP CHATURVEDI, PK (reprint author), USN,RES LAB,DIV PLASMA PHYS,SPACE PLASMA BRANCH,CODE 4781,WASHINGTON,DC 20375, USA. NR 39 TC 4 Z9 4 U1 0 U2 0 PU AMER GEOPHYSICAL UNION PI WASHINGTON PA 2000 FLORIDA AVE NW, WASHINGTON, DC 20009 SN 0148-0227 J9 J GEOPHYS RES JI J. Geophys. Res-Space Phys. PD JUN 1 PY 1992 VL 97 IS A6 BP 8559 EP 8568 DI 10.1029/92JA00301 PG 10 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA HX984 UT WOS:A1992HX98400036 ER PT J AU CARL, M HAWKINS, R COULSON, N LOWE, J ROBERTSON, DL NELSON, WM TITBALL, RW WOODY, JN AF CARL, M HAWKINS, R COULSON, N LOWE, J ROBERTSON, DL NELSON, WM TITBALL, RW WOODY, JN TI DETECTION OF SPORES OF BACILLUS-ANTHRACIS USING THE POLYMERASE CHAIN-REACTION SO JOURNAL OF INFECTIOUS DISEASES LA English DT Note AB The polymerase chain reaction (PCR) was used to identify spores of Bacillus anthracis. By using an assay capable of amplifying a 1247-bp fragment from the gene that encodes the edema factor of B. anthracis, as few as 1O(3) copies of a plasmid containing the edema factor gene and as few as 2 x 10(4) spores were detected. Subjecting the product of this PCR to a second PCR designed to amplify a 208-bp fragment nested within the 1247-bp product improved detection to a single plasmid copy per PCR and to two spores of B. anthracis per PCR. C1 UNIFORMED SERV UNIV HLTH SCI,BETHESDA,MD 20814. USA,MED RES INST INFECT DIS,FREDERICK,MD 21701. CHEM & BIOL DEF ESTAB,SALISBURY,ENGLAND. BRIGHAM YOUNG UNIV,PROVO,UT 84602. RP CARL, M (reprint author), USN,MED RES INST,NAVAL MED RES & DEV COMMAND,BLDG 17A,ROOM 316,BETHESDA,MD 20814, USA. NR 13 TC 21 Z9 21 U1 0 U2 1 PU UNIV CHICAGO PRESS PI CHICAGO PA 5720 S WOODLAWN AVE, CHICAGO, IL 60637 SN 0022-1899 J9 J INFECT DIS JI J. Infect. Dis. PD JUN PY 1992 VL 165 IS 6 BP 1145 EP 1148 PG 4 WC Immunology; Infectious Diseases; Microbiology SC Immunology; Infectious Diseases; Microbiology GA HV960 UT WOS:A1992HV96000028 PM 1583336 ER PT J AU PETROU, A CHOU, WC LIU, XC WARNOCK, J JONKER, BT AF PETROU, A CHOU, WC LIU, XC WARNOCK, J JONKER, BT TI DMS BASED QUANTUM-WELLS WITH MAGNETICALLY TUNED HEAVY HOLE CONFINEMENT SO JOURNAL OF LUMINESCENCE LA English DT Article ID EXCHANGE INTERACTION; SEMICONDUCTOR AB We discuss the results of a magneto-optical study of ZnFeSe/ZnSe/ZnFeSe and ZnMnSe/ZnSe/ZnMnSe quantum well structures grown by molecular beam epitaxy on GaAs. In both systems the zero field heavy hole offset is near zero and the heavy hole confinement is controlled by an externally applied magnetic field which produces large spin splittings in the diluted magnetic semiconductor (DMS) layers. The changes in the band structure induced by the magnetic field result in a pronounced asymmetry of the heavy hole exciton spin components as the barrier and well hole populations become spin-polarized. Both the iron- and the manganese-based structures show similar behavior even though ZnFeSe is a Van Vleck paramagnet while ZnMnSe is a Brillouin paramagnet. C1 SUNY BUFFALO,CTR ELECTR & ELECTROOPT MAT,BUFFALO,NY 14260. IBM CORP,YORKTOWN HTS,NY 10598. USN,RES LAB,WASHINGTON,DC 20375. SUNY BUFFALO,DEPT PHYS & ASTRON,BUFFALO,NY 14260. NR 14 TC 7 Z9 7 U1 1 U2 3 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0022-2313 J9 J LUMIN JI J. Lumines. PD JUN PY 1992 VL 52 IS 1-4 BP 175 EP 181 DI 10.1016/0022-2313(92)90242-2 PG 7 WC Optics SC Optics GA HY320 UT WOS:A1992HY32000015 ER PT J AU BATTEEN, ML DACOSTA, CNL NELSON, CS AF BATTEEN, ML DACOSTA, CNL NELSON, CS TI A NUMERICAL STUDY OF WIND STRESS CURL EFFECTS ON EDDIES AND FILAMENTS OFF THE NORTHWEST COAST OF THE IBERIAN PENINSULA SO JOURNAL OF MARINE SYSTEMS LA English DT Article AB A high-resolution, multi-level, primitive equation ocean model is used to examine the response to the particular conditions of anticyclonic (negative) wind stress curl and equatorward (upwelling favorable) winds along the eastern ocean boundary off the northwest coast of the Iberian Peninsula in the vicinity of the highly productive rias. A band of steady equatorward winds, which are uniform alongshore but contain zonal variability (i.e., anticyclonic wind stress curl), results in an equatorward coastal surface current nearshore and a poleward surface current offshore. In time, the currents become unstable and lead to the development of anticyclonic warm core eddies. In addition, cold core filament formation occurs in areas where the anticyclones advect the upwelled coastal water offshore. The results from the experiments support the hypothesis that wind forcing, particularly the combination of anticyclonic (negative) wind stress curl and equatorward (upwelling favorable) winds, is an important mechanism for generating opposing alongshore surface currents, anticyclonic eddies, and filaments off the northwest coast of the Iberian Peninsula. In a sensitivity study, the results from three numerical experiments are examined to understand, in a limited way, the dependence of the generation of the surface currents on the boundary conditions (free slip and no slip), the use of wind band forcing and the imposed wind stress curl distribution. Results show that, regardless of whether free-slip or no-slip boundary conditions or wind band forcing are used, opposing alongshore surface currents are generated. Because such currents do not develop when there is no wind stress curl, the opposing currents are generated by the anticyclonic wind stress curl. RP BATTEEN, ML (reprint author), USN,POSTGRAD SCH,DEPT OCEANOG,MONTEREY,CA 93943, USA. NR 0 TC 12 Z9 12 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0924-7963 J9 J MARINE SYST JI J. Mar. Syst. PD JUN PY 1992 VL 3 IS 3 BP 249 EP 266 DI 10.1016/0924-7963(92)90004-R PG 18 WC Geosciences, Multidisciplinary; Marine & Freshwater Biology; Oceanography SC Geology; Marine & Freshwater Biology; Oceanography GA KN987 UT WOS:A1992KN98700004 ER PT J AU JOHNSON, CE WEIMER, WA CERIO, FM AF JOHNSON, CE WEIMER, WA CERIO, FM TI EFFICIENCY OF METHANE AND ACETYLENE IN FORMING DIAMOND BY MICROWAVE PLASMA ASSISTED CHEMICAL VAPOR-DEPOSITION SO JOURNAL OF MATERIALS RESEARCH LA English DT Article ID FILM GROWTH AB Diamond films were grown by microwave plasma assisted chemical vapor deposition using mixtures of 1% (CH4)-C-13 and 0.5% (C2H2)-C-12 in H-2, and stable gaseous products were analyzed by mass spectrometry. The major gaseous products are methane and acetylene, and scrambling of the C-13 label can be controlled at relatively high gas flow rates. At the highest flow rate studied a diamond film was grown with 77% C-13 incorporation, while the methane in the reactor exhaust gas at this flow rate contained 83% C-13. By comparing gaseous C-13 compositions with that of the films, the efficiency of diamond growth from methane (possibly via the methyl radical) is estimated to be about ten times higher than that for acetylene. RP JOHNSON, CE (reprint author), USN,CTR AIR WARFARE,RES DEPT,DIV CHEM,CHINA LAKE,CA 93555, USA. NR 14 TC 43 Z9 43 U1 0 U2 4 PU MATERIALS RESEARCH SOCIETY PI PITTSBURGH PA 9800 MC KNIGHT ROAD SUITE 327, PITTSBURGH, PA 15237 SN 0884-2914 J9 J MATER RES JI J. Mater. Res. PD JUN PY 1992 VL 7 IS 6 BP 1427 EP 1431 DI 10.1557/JMR.1992.1427 PG 5 WC Materials Science, Multidisciplinary SC Materials Science GA HY106 UT WOS:A1992HY10600017 ER PT J AU WANG, SW KHAN, A SANDS, R VASUDEVAN, AK AF WANG, SW KHAN, A SANDS, R VASUDEVAN, AK TI A NOVEL NANOINDENTOR TECHNIQUE FOR MEASURING FIBER MATRIX INTERFACIAL STRENGTHS IN COMPOSITES SO JOURNAL OF MATERIALS SCIENCE LETTERS LA English DT Article ID FIBER C1 USN,OFF NAVAL RES,ARLINGTON,VA 22217. RP WANG, SW (reprint author), USN,CTR AIR DEV,CODE 6063,WARMINSTER,PA 18974, USA. NR 7 TC 8 Z9 8 U1 0 U2 1 PU CHAPMAN HALL LTD PI LONDON PA 2-6 BOUNDARY ROW, LONDON, ENGLAND SE1 8HN SN 0261-8028 J9 J MATER SCI LETT JI J. Mater. Sci. Lett. PD JUN 1 PY 1992 VL 11 IS 11 BP 739 EP 741 DI 10.1007/BF00729477 PG 3 WC Materials Science, Multidisciplinary SC Materials Science GA HY332 UT WOS:A1992HY33200009 ER PT J AU HEALY, LM DRAGT, AJ GJAJA, IM AF HEALY, LM DRAGT, AJ GJAJA, IM TI COMPUTATION OF ERROR EFFECTS IN NONLINEAR HAMILTONIAN-SYSTEMS USING LIE ALGEBRAIC METHODS SO JOURNAL OF MATHEMATICAL PHYSICS LA English DT Article ID OPTICS; FIELD AB There exist Lie algebraic methods for obtaining transfer maps around any given trajectory of a Hamiltonian system. This paper describes an iterative procedure for finding transfer maps around the same trajectory when the Hamiltonian is perturbed by small linear terms. Such terms often result when an actual system deviates from an ideal one due to errors. Two examples from accelerator physics are worked out. Comparisons with numerical computations, and in simple cases exact analytical calculations, demonstrate the validity of the procedure. C1 UNIV MARYLAND,DEPT PHYS,CTR THEORET PHYS,COLLEGE PK,MD 20742. RP HEALY, LM (reprint author), USN,RES LAB,CTR SPACE TECHNOL,CODE 8242,WASHINGTON,DC 20375, USA. NR 27 TC 3 Z9 3 U1 0 U2 1 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0022-2488 J9 J MATH PHYS JI J. Math. Phys. PD JUN PY 1992 VL 33 IS 6 BP 1948 EP 1963 DI 10.1063/1.529670 PG 16 WC Physics, Mathematical SC Physics GA HV475 UT WOS:A1992HV47500002 ER PT J AU HYAMS, KC PHILLIPS, IA MORAN, AY TEJADA, A WIGNALL, FS ESCAMILLA, J AF HYAMS, KC PHILLIPS, IA MORAN, AY TEJADA, A WIGNALL, FS ESCAMILLA, J TI SEROPREVALENCE OF HEPATITIS-C ANTIBODY IN PERU SO JOURNAL OF MEDICAL VIROLOGY LA English DT Article DE VIRAL HEPATITIS; NON-A, NON-B HEPATITIS; HEPATITIS-C; HEPATITIS-B ID NON-B-HEPATITIS; NON-A; VIRUS-INFECTION; RISK; PREVALENCE AB The prevalence in Peru of antibody to hepatitis C virus (anti-HCV) was determined in a survey of populations living in the northern jungle region and in groups at high risk of parenterally and sexually transmitted diseases. All sera were initially screened for anti-HCV using commercial first and second generation ELISAs; repeatedly reactive sera were further verified with a second generation immunoblot assay. Serum samples were also tested by ELISA for HBsAg, anti-HBs, and anti-HBc. None of 2,111 sera obtained in the survey of jungle residents was positive for anti-HCV by immunoblot assay. Twelve of 16 HIV-1 antibody positive hemophiliacs, one of 103 HIV-1 antibody positive homosexuals, and three of 602 HIV-1 negative registered female prostitutes were positive for anti-HCV. A high prevalence of total markers of hepatitis B infection was found in all subjects, especially in older subjects and groups at high risk of parenterally and sexually transmitted diseases. The findings of this study indicate that seropositivity for hepatitis C virus antibody is uncommon in Peru except in high risk groups and suggest that the epidemiology of hepatitis C differs substantially from hepatitis B. C1 USN,MED RES INST,BETHESDA,MD 20814. USN,MED RES INST DETACHMENT,BETHESDA,MD 20814. HOSP NACL GUILLERMO ALMENARA IRIGOYEN,LIMA,PERU. SAN MARCOS INST TROP MED,LIMA,PERU. USN,ENVIRONM & PREVENT MED UNIT 6,HONOLULU,HI. NR 25 TC 21 Z9 25 U1 0 U2 1 PU WILEY-LISS PI NEW YORK PA DIV JOHN WILEY & SONS INC 605 THIRD AVE, NEW YORK, NY 10158-0012 SN 0146-6615 J9 J MED VIROL JI J. Med. Virol. PD JUN PY 1992 VL 37 IS 2 BP 127 EP 131 DI 10.1002/jmv.1890370210 PG 5 WC Virology SC Virology GA HY080 UT WOS:A1992HY08000009 PM 1378483 ER PT J AU MARSHALL, GN WORTMAN, CB KUSULAS, JW HERVIG, LK VICKERS, RR AF MARSHALL, GN WORTMAN, CB KUSULAS, JW HERVIG, LK VICKERS, RR TI DISTINGUISHING OPTIMISM FROM PESSIMISM - RELATIONS TO FUNDAMENTAL DIMENSIONS OF MOOD AND PERSONALITY SO JOURNAL OF PERSONALITY AND SOCIAL PSYCHOLOGY LA English DT Article ID GENERALIZED OUTCOME EXPECTANCIES; DISPOSITIONAL OPTIMISM; DEPRESSION; ANXIETY; HEALTH AB Contrary to unidimensional conceptions of optimism and pessimism, factor analysis of 2 widely used instruments revealed that optimism and pessimism are empirically differentiable, but related, constructs. Moreover, consistent with expectations, optimism and pessimism were differentially linked with fundamental dimensions of mood and personality. Pessimism was principally associated with neuroticism and negative affect. Optimism was primarily associated with extraversion and positive affect. Findings are discussed with reference to current conceptual and measurement models of optimism and pessimism and their relations to broad dimensions of mood and personality. C1 USN,HLTH RES CTR,DEPT STRESS MED,SAN DIEGO,CA 92152. GEOCENTERS INC,SAN DIEGO,CA. SUNY STONY BROOK,STONY BROOK,NY 11794. NR 27 TC 294 Z9 309 U1 7 U2 37 PU AMER PSYCHOLOGICAL ASSOC PI WASHINGTON PA 750 FIRST ST NE, WASHINGTON, DC 20002-4242 SN 0022-3514 J9 J PERS SOC PSYCHOL JI J. Pers. Soc. Psychol. PD JUN PY 1992 VL 62 IS 6 BP 1067 EP 1074 DI 10.1037//0022-3514.62.6.1067 PG 8 WC Psychology, Social SC Psychology GA HY088 UT WOS:A1992HY08800014 ER PT J AU KOEHLER, WF AF KOEHLER, WF TI A K-12 FACULTY SALARY-GROWTH MODEL - STATE AND LOCAL NORMS SO JOURNAL OF PERSONNEL EVALUATION IN EDUCATION LA English DT Article RP KOEHLER, WF (reprint author), USN,POSTGRAD SCH,52 ALTA MESA CIRCLE,MONTEREY,CA 93940, USA. NR 10 TC 0 Z9 0 U1 0 U2 0 PU KLUWER ACADEMIC PUBL PI DORDRECHT PA SPUIBOULEVARD 50, PO BOX 17, 3300 AA DORDRECHT, NETHERLANDS SN 0920-525X J9 J PERS EVAL EDUC PD JUN PY 1992 VL 5 IS 4 BP 369 EP 399 DI 10.1007/BF00126829 PG 31 WC Education & Educational Research SC Education & Educational Research GA JC989 UT WOS:A1992JC98900004 ER PT J AU BEX, RT PARKER, MW JUDKINS, JT PELLEU, GB AF BEX, RT PARKER, MW JUDKINS, JT PELLEU, GB TI EFFECT OF DENTINAL BONDED RESIN POSTCORE PREPARATIONS ON RESISTANCE TO VERTICAL ROOT FRACTURE SO JOURNAL OF PROSTHETIC DENTISTRY LA English DT Article ID COMPOSITE RESIN; DOWEL; TEETH; REINFORCEMENT AB An in vitro study was conducted to compare the resistance to failure of two restorative protocols for endodontically treated teeth. Half of 24 specimens received cemented cast post-core restorations and the other half were restored with dentin-bonded composite resin using the ferric oxalate, NTG-GMA, and the PMDM system developed by Bowen. 2,3 The dentin-bonded resin post-core restorations provided significantly less resistance to failure than the cemented custom cast post-core. The dentin-bonded resin post-core fractured in every instance before the root fractured. A greater force was required to cause failure of the resin post as the cross-sectional area of the post increased. C1 USN,SCH DENT,NATL NAVAL DENT CTR,RES DEPT,BETHESDA,MD 20814. NR 29 TC 18 Z9 22 U1 1 U2 1 PU MOSBY-YEAR BOOK INC PI ST LOUIS PA 11830 WESTLINE INDUSTRIAL DR, ST LOUIS, MO 63146-3318 SN 0022-3913 J9 J PROSTHET DENT JI J. Prosthet. Dent. PD JUN PY 1992 VL 67 IS 6 BP 768 EP 772 PG 5 WC Dentistry, Oral Surgery & Medicine SC Dentistry, Oral Surgery & Medicine GA HX263 UT WOS:A1992HX26300007 PM 1403857 ER PT J AU PAPOULIAS, FA HEALEY, AJ AF PAPOULIAS, FA HEALEY, AJ TI PATH CONTROL OF SURFACE SHIPS USING SLIDING MODES SO JOURNAL OF SHIP RESEARCH LA English DT Article AB The surface ship path control problem is formulated as a nonlinear state space control problem subject to disturbances, modeling errors, and parameter uncertainty. A "destroyer study" ship using a nonlinear maneuvering model is used as the system model. The system to be controlled is highly nonlinear with parameters that vary with speed and operational conditions. Uncertainty in the force coefficients, as well as in disturbances of the seaway lead to the need for a robust control for navigational accuracy. This paper investigates the use of cross track error and line-of-sight guidance laws with a sliding mode autopilot for path control of surface ships, and presents results based on computer simulations using the model described above. The results illustrate the simplicity and effectiveness of the robust control design for compensating the nonlinearities and disturbance effects with improvements in the navigational accuracy. Comparisons between the two guidance schemes are presented and guidelines are developed with respect to proper guidance selection. RP PAPOULIAS, FA (reprint author), USN,POSTGRAD SCH,DEPT MECH ENGN,MONTEREY,CA 93940, USA. NR 0 TC 5 Z9 5 U1 0 U2 0 PU SOC NAVAL ARCH MARINE ENG PI JERSEY CITY PA 601 PAVONIA AVENUE, JERSEY CITY, NJ 07306 SN 0022-4502 J9 J SHIP RES JI J. Ship Res. PD JUN PY 1992 VL 36 IS 2 BP 141 EP 153 PG 13 WC Engineering, Marine; Engineering, Civil SC Engineering GA JC181 UT WOS:A1992JC18100003 ER PT J AU BRENNAN, T AF BRENNAN, T TI THE WINE REVOLUTION IN FRANCE - THE 20TH-CENTURY - LOUBERE,LA SO JOURNAL OF SOCIAL HISTORY LA English DT Book Review RP BRENNAN, T (reprint author), USN ACAD,ANNAPOLIS,MD 21402, USA. NR 1 TC 0 Z9 0 U1 0 U2 0 PU CARNEGIE MELLON UNIV PRESS PI PITTSBURGH PA CARNEGIE MELLON UNIV J SOCIAL HIST, PITTSBURGH, PA 15213 SN 0022-4529 J9 J SOC HIST JI J. Soc. Hist. PD SUM PY 1992 VL 25 IS 4 BP 924 EP 925 PG 2 WC History SC History GA HW964 UT WOS:A1992HW96400030 ER PT J AU CONWAY, TL VICKERS, RR FRENCH, JRP AF CONWAY, TL VICKERS, RR FRENCH, JRP TI AN APPLICATION OF PERSON-ENVIRONMENT FIT THEORY - PERCEIVED VERSUS DESIRED CONTROL SO JOURNAL OF SOCIAL ISSUES LA English DT Article AB A brief overview of Person-Environment Fit Theory and new findings applying this model to the area of perceived control are presented. This study examined whether different control constructs (i.e., perceived control, desired control, and "misfit" between perceived and desired control) are all important for predicting psychological adjustment. Respondents included 622 men and women who participated in a six-month longitudinal panel study. Misfit measures for three sources of control (internal, others, and chance) accounted for significant variance independent of the variance accounted for by perceived and desired control measures. In general, either too much or too little perceived control relative to the amount desired tended to be associated with more psychological "strain." C1 UNIV MICHIGAN,INST SOCIAL RES,SOCIAL ENVIRONM & MENTAL HLTH PROGRAM,ANN ARBOR,MI 48109. UNIV MICHIGAN,GRP DYNAM RES CTR,ANN ARBOR,MI 48109. RP CONWAY, TL (reprint author), USN,HLTH RES CTR,POB 85122,SAN DIEGO,CA 92186, USA. NR 26 TC 13 Z9 13 U1 2 U2 10 PU PLENUM PUBL CORP PI NEW YORK PA 233 SPRING ST, NEW YORK, NY 10013 SN 0022-4537 J9 J SOC ISSUES JI J. Soc. Issues PD SUM PY 1992 VL 48 IS 2 BP 95 EP 107 PG 13 WC Social Issues; Psychology, Social SC Social Issues; Psychology GA JE858 UT WOS:A1992JE85800008 ER PT J AU BOOTHKEWLEY, S ROSENFELD, P EDWARDS, JE AF BOOTHKEWLEY, S ROSENFELD, P EDWARDS, JE TI IMPRESSION MANAGEMENT AND SELF-DECEPTIVE ENHANCEMENT AMONG HISPANIC AND NON-HISPANIC WHITE NAVY RECRUITS SO JOURNAL OF SOCIAL PSYCHOLOGY LA English DT Article AB As part of a larger investigation of response effects on organizational surveys, the present study compared the responses of Hispanic and non-Hispanic U.S. Navy recruits on the Balanced Inventory of Desirable Responding (BIDR). The inventory contains two measures of socially desirable responding: impression management, the deliberate tendency to over-report desirable behaviors and under-report undesirable ones, and self-deceptive enhancement, the tendency to give overly positive but honest self-reports. Hispanic recruits had significantly higher scores than non-Hispanic Whites on impression management; the two groups did not, however, differ on self-deceptive enhancement. These findings suggest that Hispanics may be more likely than non-Hispanic Whites to present a positive picture of themselves to others but do not differ from non-Hispanic Whites on the amount of positive self-deceptive enhancement they engage in. The results were interpreted with reference to the Hispanic cultural value of simpatia. RP BOOTHKEWLEY, S (reprint author), USN,CTR PERSONNEL RES & DEV,WOMEN & MULTICULTURAL RES OFF,CODE 01E,SAN DIEGO,CA 92152, USA. NR 24 TC 11 Z9 11 U1 0 U2 2 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 JUN PY 1992 VL 132 IS 3 BP 323 EP 329 PG 7 WC Psychology, Social SC Psychology GA JJ203 UT WOS:A1992JJ20300005 ER PT J AU YOST, DS AF YOST, DS TI THE HISTORY OF NATO THEATER NUCLEAR-FORCE POLICY - KEY FINDINGS FROM THE SANDIA CONFERENCE SO JOURNAL OF STRATEGIC STUDIES LA English DT Article RP YOST, DS (reprint author), USN,POSTGRAD SCH,MONTEREY,CA 93940, USA. NR 36 TC 1 Z9 1 U1 0 U2 0 PU FRANK CASS CO LTD PI LONDON PA 11 GAINSBOROUGH ROAD, LONDON, ENGLAND E11 1RS SN 0140-2390 J9 J STRATEGIC STUD JI J. Strateg. Stud. PD JUN PY 1992 VL 15 IS 2 BP 228 EP 261 DI 10.1080/01402399208437482 PG 34 WC International Relations; Political Science SC International Relations; Government & Law GA JG802 UT WOS:A1992JG80200004 ER PT J AU GEIST, GA GINATEMPO, B SHELTON, WA STOCKS, GM AF GEIST, GA GINATEMPO, B SHELTON, WA STOCKS, GM TI PARALLEL SUPERCONDUCTOR CODE ON THE IPSC/860 SO JOURNAL OF SUPERCOMPUTING LA English DT Article DE MATERIALS SCIENCE; 1ST PRINCIPLES; PARALLEL COMPUTATION; PVM ID ALLOYS AB Researchers at Oak Ridge National Laboratory have developed an application code tor calculating the electronic properties and energetics of disordered materials. The same source code has been compiled and run on workstations, Crays, and the Intel iPSC/860. This electronic structures code is capable of running at over 2 gigaflops on both an 8-processor CRAY Y-MP and a 128-processor Intel iPSC/860. Using this new KKR-CPA code, we executed density of-state computations of a perovskite superconductor at a rate of 2527 megaflops on the Intel iPSC/860. This corresponds to a price/performance rate of 842 megaflops per $1 million based on the list price of this computer. Similar but smaller computations done on a network of ten IBM RS/6000 workstations executed at a price/performance rate of 1.3 gigaflops per $1 million. C1 USN,RES LAB,WASHINGTON,DC 20375. OAK RIDGE NATL LAB,DIV MET & CERAM,OAK RIDGE,TN 37831. UNIV MESSINA,CISM,UNITA GRP NAZL STRUTTURA MAT,IST FIS TEOR,I-98100 MESSINA,ITALY. RP GEIST, GA (reprint author), OAK RIDGE NATL LAB,MATH SCI SECT,POB 2008,OAK RIDGE,TN 37831, USA. RI Stocks, George Malcollm/Q-1251-2016 OI Stocks, George Malcollm/0000-0002-9013-260X NR 10 TC 0 Z9 0 U1 0 U2 0 PU KLUWER ACADEMIC PUBL PI DORDRECHT PA SPUIBOULEVARD 50, PO BOX 17, 3300 AA DORDRECHT, NETHERLANDS SN 0920-8542 J9 J SUPERCOMPUT JI J. Supercomput. PD JUN PY 1992 VL 6 IS 2 BP 153 EP 162 DI 10.1007/BF00129776 PG 10 WC Computer Science, Hardware & Architecture; Computer Science, Theory & Methods; Engineering, Electrical & Electronic SC Computer Science; Engineering GA JX860 UT WOS:A1992JX86000004 ER PT J AU SARKISSIAN, A AF SARKISSIAN, A TI RADIATION OR SCATTERING FROM MULTIPLE AXISYMMETRICAL CYLINDERS SO JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA LA English DT Article AB The boundary-element method is applied to solve for the radiation or scattering from multiple cylinders having given surface normal velocity distributions. The axisymmetric case is considered where all cylinders have the same axis of symmetry with an arbitrary surface velocity field. The algorithm is applied to solve for scattering from rigid cylinders with hemispherical endcaps. Numerical results are presented for different two- or three-cylinder configurations with a plane wave incident from various directions. The dependence of the scattered field on the distance between two identical cylinders is examined as well as scattering from one large and one small cylinder. RP SARKISSIAN, A (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 14 TC 1 Z9 1 U1 0 U2 0 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0001-4966 J9 J ACOUST SOC AM JI J. Acoust. Soc. Am. PD JUN PY 1992 VL 91 IS 6 BP 3121 EP 3125 DI 10.1121/1.402849 PG 5 WC Acoustics; Audiology & Speech-Language Pathology SC Acoustics; Audiology & Speech-Language Pathology GA HX655 UT WOS:A1992HX65500004 ER PT J AU LEE, D BOTSEAS, G SIEGMANN, WL AF LEE, D BOTSEAS, G SIEGMANN, WL TI EXAMINATION OF 3-DIMENSIONAL EFFECTS USING A PROPAGATION MODEL WITH AZIMUTH-COUPLING CAPABILITY (FOR3D) SO JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA LA English DT Article ID ACOUSTIC PROPAGATION; EQUATION; OCEAN AB A three-dimensional wave propagation model of parabolic approximation type (FOR3D) is used to examine 3-D ocean environmental variations. The background theory and characteristics of the model are reviewed briefly. Propagation situations that are classified as 3-D, N X 2-D, and 2-D are described in connection with FOR3D and are interpreted in several ways. An analytic exact solution is used to demonstrate the model's accuracy and its capability for treating fully 3-D propagation, when coupling exists between solutions in adjacent vertical planes of constant azimuth. It is also employed to illustrate a procedure for using approximate conditions at vertical side boundaries in a 3-D calculation. An application is made to an Atlantic Ocean shelf-slope environment with realistic bottom topographic variations and sound-speed profiles. The occurrence of significant azimuthal coupling is demonstrated in propagation loss versus range curves. It follows that, while the N X 2-D approximation of no azimuthal coupling is useful in many situations, not all 3-D ocean acoustics problems can be adequately solved without a fully 3-D propagation model. C1 RENSSELAER POLYTECH INST,TROY,NY 12180. RP LEE, D (reprint author), USN,CTR UNDERWATER SYST,NEW LONDON,CT 06320, USA. NR 28 TC 49 Z9 51 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 JUN PY 1992 VL 91 IS 6 BP 3192 EP 3202 DI 10.1121/1.402856 PG 11 WC Acoustics; Audiology & Speech-Language Pathology SC Acoustics; Audiology & Speech-Language Pathology GA HX655 UT WOS:A1992HX65500012 ER PT J AU GOODMAN, L OESCHGER, J SZARGOWICZ, D AF GOODMAN, L OESCHGER, J SZARGOWICZ, D TI OCEAN ACOUSTICS TURBULENCE STUDY - ACOUSTIC SCATTERING FROM A BUOYANT AXISYMMETRICAL PLUME SO JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA LA English DT Article ID WATER; MICROSTRUCTURE; SOUND AB Limited in situ measurements from high-frequency underwater acoustic echosounders have suggested that there may be circumstances in which acoustic scattering from ocean temperature variability is sufficiently intense to be observable over volume reverberation due to biologics. A new laboratory program, the ocean acoustics turbulence study (OATS), has been undertaken to quantify such scattering. The laboratory employs a very precise computer-controlled positioning system and allows a scattering geometry from a near forward-scattering angle, 5-degrees, to a near backscattering angle, 160-degrees. This article reports on results of an initial set of experiments utilizing a 1-MHz, 1-cycle transmitted pulse scattering from a temperature anomaly field produced by a laminar buoyant plume. The objective of this experiment is to compare observations of acoustic scattering from the temperature anomaly with that predicted by the Bragg scattering condition. A parameter regime is chosen such that the laminar plume has an approximately axisymmetric and Gaussian temperature profile. For the two-dimensional axisymmetric case, the Bragg scattering condition allows prediction of an acoustically derived two-dimensional Fourier transform of the temperature field. The acoustically derived two-dimensional Fourier transform and the one derived directly from in situ temperature measurements are in good agreement, except at the higher frequency range of the bandwidth of the scattered signal. Discussion of the possibility of inverting such measurements for a direct calculation of the temperature field is presented. C1 UNIV RHODE ISL,KINGSTON,RI 02881. RP GOODMAN, L (reprint author), USN,CTR UNDERWATER SYST,NEWPORT,RI 02841, USA. NR 20 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 0001-4966 J9 J ACOUST SOC AM JI J. Acoust. Soc. Am. PD JUN PY 1992 VL 91 IS 6 BP 3212 EP 3227 DI 10.1121/1.402858 PG 16 WC Acoustics; Audiology & Speech-Language Pathology SC Acoustics; Audiology & Speech-Language Pathology GA HX655 UT WOS:A1992HX65500014 ER PT J AU EWING, KJ JAGANATHAN, J PEITERSEN, L AGGARWAL, ID SOMMERS, JA FAHEY, JV AF EWING, KJ JAGANATHAN, J PEITERSEN, L AGGARWAL, ID SOMMERS, JA FAHEY, JV TI RADIOTRACER STUDY OF THE PREPARATION OF HIGH-PURITY LANTHANUM FLUORIDE SO JOURNAL OF THE AMERICAN CERAMIC SOCIETY LA English DT Article ID ABSORPTION; GLASSES; METAL AB The behavior of the impurities iron, cobalt, yttrium, and cerium is determined via radiotracer techniques for the preparation of high-purity lanthanum fluoride. The behavior of nickel and copper during the coprecipitation of a lanthanum nitrate solution is determined by graphite furnace atomic absorption spectrometric (GFAAS) analysis. There is no commercially available radiotracer for neodymium, a key impurity associated with absorption losses in fluoride glasses. However, the chemical behavior of neodymium and that of yttrium are very similar and, therefore, it is reasonable to assume that the behavior of yttrium throughout the processing is indicative of the behavior of neodymium. The concentrations of impurities in lanthanum nitrate, carbonate, and fluoride are estimated using the radiotracer and GFAAS data for each processing step. Results indicate that while high-purity lanthanum carbonate can be prepared, any impurities present in the lanthanum carbonate will be carried quantitatively into lanthanum fluoride upon hydrofluorination. The data also indicate that lanthanum nitrate can be prepared in higher purity than lanthanum carbonate; however, lanthanum fluoride prepared from the nitrate forms a very wet precipitate which is extremely difficult to filter and dry. The presence of excess water in lanthanum fluoride results in high levels of oxide contamination in lanthanum fluoride as well as the fluoride glass. Preparation of low-oxide lanthanum fluoride is required because high oxide levels in fluoride glasses cause increased scattering. Therefore, from a fluoride glass point of view, the preferred synthetic route for the preparation of high-purity lanthanum fluoride is to first purify lanthanum nitrate, then convert this to the carbonate, which is then converted to lanthanum fluoride. The estimated impurity concentrations in lanthanum fluoride derived from lanthanum carbonate are as follows: Fe, 89 ng/g; Co, <3 ng/g; Ni, <12 ng/g; Cu, 6 ng/g; Y, 62 ng/g; Ce, 248 ng/g. The loss contributed to a ZBLAN fiber incorporating this lanthanum fluoride is calculated to be 0.082 dB/km; here the concentration of neodymium is assumed to be equal to that of yttrium. These data indicate that the lanthanum fluoride prepared by the current method will not meet the ultimate requirements for ultra-low-loss fluoride glasses. C1 TELEDYNE WAH CHANG CORP,ALBANY,OR 97321. RP EWING, KJ (reprint author), USN,RES LAB,CODE 6505,WASHINGTON,DC 20375, USA. NR 14 TC 2 Z9 2 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 JUN PY 1992 VL 75 IS 6 BP 1562 EP 1565 DI 10.1111/j.1151-2916.1992.tb04225.x PG 4 WC Materials Science, Ceramics SC Materials Science GA HZ219 UT WOS:A1992HZ21900039 ER PT J AU BENDER, BA JESSEN, TL LEWIS, D AF BENDER, BA JESSEN, TL LEWIS, D TI OPTIMIZATION OF THE MECHANICAL-PROPERTIES OF SILICON CARBIDE-FIBER-REINFORCED ZIRCONIA TITANATE MATRIX COMPOSITES THROUGH CONTROLLED PROCESSING SO JOURNAL OF THE AMERICAN CERAMIC SOCIETY LA English DT Article DE COMPOSITES; PROCESSING; ZIRCONIUM; TITANATES; FIBER REINFORCEMENT ID STRENGTH; FRACTURE; CERAMICS AB The effects of processing parameters on the microstructure and mechanical behavior of a SiC-fiber-reinforced ZrTiO4 matrix composite were evaluated through a controlled study. The microstructure was analyzed using X-ray diffraction (XRD), scanning electron microscopy (SEM), and transmission electron microscopy (TEM). Mechanical behavior was characterized by strength and toughness measurements, which were correlated with the microstructure of the composite. The optimized processing schedule developed included incorporation of CO-heat-treated BN-coated fibers, composite calcination at 530-degrees-C, and consolidation via hot-pressing at 1270-degrees-C and 17.25 MPa applied pressure in an atmosphere of CO at an overpressure of 111.5 kPa (1.1 atm). Use of this processing schedule improved in situ fiber strength and modified the fiber/matrix interfacial microstructure to ameliorate its sliding and debonding resistance, leading to a composite with average strength over 1 GPa and a toughness of 26 MPa.m1/2. RP BENDER, BA (reprint author), USN,RES LAB,CERAM & COMPOSITES BRANCH,WASHINGTON,DC 20375, USA. NR 23 TC 16 Z9 16 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 JUN PY 1992 VL 75 IS 6 BP 1628 EP 1635 DI 10.1111/j.1151-2916.1992.tb04235.x PG 8 WC Materials Science, Ceramics SC Materials Science GA HZ219 UT WOS:A1992HZ21900049 ER PT J AU DONG, FM HASHISAKA, AE RASCO, BA EINSTEIN, MA MAR, DR AKER, SN AF DONG, FM HASHISAKA, AE RASCO, BA EINSTEIN, MA MAR, DR AKER, SN TI IRRADIATED OR ASEPTICALLY PREPARED FROZEN DAIRY DESSERTS - ACCEPTABILITY TO BONE-MARROW TRANSPLANT RECIPIENTS SO JOURNAL OF THE AMERICAN DIETETIC ASSOCIATION LA English DT Article ID GAMMA-IRRADIATION; PRODUCTS; CANCER AB Sterile ice cream and frozen yogurt were offered to immunosuppressed patients recovering from bone marrow transplantation. To obtain sterile products, two of the dairy desserts (prepackaged ice cream and frozen yogurt bars) were exposed to 40 kGy of cobalt 60 irradiation. Four different flavors of ice cream were aseptically prepared under a laminar airflow hood using commercially sterilized ingredients. A commercially sterile, frozen milk-based drink on the low-microbial menu served as the control. Ratings of the seven products by 17 patients indicated that a frozen vanilla milk-based drink and aseptically prepared chocolate ice cream were highly acceptable to recovering immunosuppressed patients who have difficulty eating most foods. However, the seven desserts received higher ratings from a sensory panel of healthy individuals than from the patient panel, confirming that new foods for the low-microbial diet should be "market-tested" by the targeted patient population before inclusion in the menu. C1 BEATRICE HUNT WESSON,FULLERTON,CA 92633. SENSTEK INC,MERCER ISL,WA 98040. USN,POSTGRAD SCH,WR CHURCH COMP CTR,MONTEREY,CA 93943. FRED HUTCHINSON CANC RES CTR,DIV CLIN RES,CLIN NUTR PROGRAM,SEATTLE,WA 98104. UNIV WASHINGTON,DEPT PHYSIOL NURSING,SEATTLE,WA 98195. RP DONG, FM (reprint author), UNIV WASHINGTON,INST FOOD SCI & TECHNOL,SEATTLE,WA 98195, USA. FU NIDDK NIH HHS [DK 35816] NR 14 TC 7 Z9 7 U1 0 U2 1 PU AMER DIETETIC ASSOC PI CHICAGO PA 216 W JACKSON BLVD #800, CHICAGO, IL 60606-6995 SN 0002-8223 J9 J AM DIET ASSOC JI J. Am. Diet. Assoc. PD JUN PY 1992 VL 92 IS 6 BP 719 EP 723 PG 5 WC Nutrition & Dietetics SC Nutrition & Dietetics GA HY825 UT WOS:A1992HY82500020 PM 1607569 ER PT J AU TRENT, LK AF TRENT, LK TI NUTRITION KNOWLEDGE OF ACTIVE-DUTY NAVY PERSONNEL SO JOURNAL OF THE AMERICAN DIETETIC ASSOCIATION LA English DT Article AB As evidence continues to mount implicating diet in the etiology of disease, the US Navy is developing nutrition education programs designed to reflect the consolidated dietary recommendations of national expert agencies. The purpose of this study was to provide a baseline assessment of the level of nutrition knowledge among Navy personnel. Forty true/false questions were developed to test nutrition knowledge as conveyed by the Navy's instructional manual for nutrition educators. The questionnaire was mailed to a representative sample of all active-duty Navy personnel. Usable questionnaires were received from 2,938 participants (72.7% response rate). Mean number of correct items was 26.1 (65%). Nutrition knowledge was higher among older respondents, more highly educated personnel, whites, officers, women, and overweight individuals. Knowledge was weakest in the areas of calories/food intake and carbohydrates and strongest on vitamins/minerals and fiber. Program managers were recommended to intensify efforts to reach low-scoring subgroups, place more emphasis on the role of complex carbohydrates, disseminate guidelines for using nutrition labels on products, and develop point-of-choice nutrition education interventions for military dining facilities. RP TRENT, LK (reprint author), USN,HLTH RES CTR,HLTH SCI & EPIDEMIOL RES DEPT,SAN DIEGO,CA 92186, USA. NR 16 TC 10 Z9 10 U1 0 U2 3 PU AMER DIETETIC ASSOC PI CHICAGO PA 216 W JACKSON BLVD #800, CHICAGO, IL 60606-6995 SN 0002-8223 J9 J AM DIET ASSOC JI J. Am. Diet. Assoc. PD JUN PY 1992 VL 92 IS 6 BP 724 EP 728 PG 5 WC Nutrition & Dietetics SC Nutrition & Dietetics GA HY825 UT WOS:A1992HY82500021 PM 1607570 ER PT J AU BROWN, JR MELSON, RO BREAUD, TP AF BROWN, JR MELSON, RO BREAUD, TP TI DEGRADATION OF MALATHION IN THERMALLY GENERATED AEROSOLS SO JOURNAL OF THE AMERICAN MOSQUITO CONTROL ASSOCIATION LA English DT Note AB The degradation of malathion, undiluted and diluted with No. 2 fuel oil, in thermally generated aerosol clouds was examined at selected temperatures ranging from 121 to 566-degrees-C. Undiluted malathion residues decreased from 1.76 to 0.21-mu-g/ml over this range of temperatures. Malathion diluted with fuel oil decreased from 0.14 to 0.02-mu-g/ml as the temperature was increased 288 to 510-degrees-C. RP BROWN, JR (reprint author), USN,CTR DIS VECTOR ECOL & CONTROL,NAVAL AIR STN,BOX 43,JACKSONVILLE,FL 32212, USA. NR 5 TC 0 Z9 0 U1 0 U2 0 PU AMER MOSQUITO CONTROL ASSN INC PI LAKE CHARLES PA 707-A EAST PRIEN LAKE ROAD, PO BOX 5416, LAKE CHARLES, LA 70606-5416 SN 8756-971X J9 J AM MOSQUITO CONTR JI J. Am. Mosq. Control Assoc. PD JUN PY 1992 VL 8 IS 2 BP 191 EP 192 PG 2 WC Entomology SC Entomology GA JB810 UT WOS:A1992JB81000015 PM 1431863 ER PT J AU HOLLAND, GJ EVANS, JL AF HOLLAND, GJ EVANS, JL TI INTERACTIONS BETWEEN A BAROTROPIC VORTEX AND AN IDEALIZED SUBTROPICAL RIDGE .2. STRUCTURE CHANGES SO JOURNAL OF THE ATMOSPHERIC SCIENCES LA English DT Article ID TROPICAL CYCLONE MOTION; MODEL; FLOW AB The interactions between a barotropic vortex and an idealized subtropical ridge environment on a beta plane are examined and compared to the well-documented case of a single vortex with no environmental flow. First, the problems and advantages of several potential partitioning methods are discussed and then a three-part partition is chosen. Substantial variations are found from the single vortex case. In particular, the familiar gyres associated with the propagation of a single vortex are markedly distorted and relocated by the environment. A vorticity budget is presented to help isolate the physical mechanisms. This analysis indicates that the major processes are associated with interactions with the gradients of absolute vorticity in the environment. Other nonlinear mechanisms can also be of significance in specific cases. C1 USN,POSTGRAD SCH,MONTEREY,CA 93940. MONASH UNIV,MELBOURNE,VIC 3004,AUSTRALIA. BUR METEOROL,RES CTR,MELBOURNE,AUSTRALIA. NR 23 TC 7 Z9 7 U1 0 U2 0 PU AMER METEOROLOGICAL SOC PI BOSTON PA 45 BEACON ST, BOSTON, MA 02108-3693 SN 0022-4928 J9 J ATMOS SCI JI J. Atmos. Sci. PD JUN 1 PY 1992 VL 49 IS 11 BP 963 EP 975 DI 10.1175/1520-0469(1992)049<0963:IBABVA>2.0.CO;2 PG 13 WC Meteorology & Atmospheric Sciences SC Meteorology & Atmospheric Sciences GA HV477 UT WOS:A1992HV47700005 ER PT J AU CALVERT, JM CHEN, MS DULCEY, CS GEORGER, JH PECKERAR, MC SCHNUR, JM SCHOEN, PE AF CALVERT, JM CHEN, MS DULCEY, CS GEORGER, JH PECKERAR, MC SCHNUR, JM SCHOEN, PE TI DEEP ULTRAVIOLET LITHOGRAPHY OF MONOLAYER FILMS WITH SELECTIVE ELECTROLESS METALLIZATION SO JOURNAL OF THE ELECTROCHEMICAL SOCIETY LA English DT Article ID RESISTS AB A top surface imaging approach for the fabrication of submicron features on solid substrates has been developed. A monolayer film is exposed to patterned deep ultraviolet radiation, then selectively metallized using electroless deposition such that a thin metal layer (200-400 angstrom) is deposited only in the unexposed areas. The film/metal assembly is a highly effective mask for reactive ion etching which can subsequently be stripped from the substrate after feature definition. Features with 0.3-mu-m line width in polysilicon and working transistor test structures have been produced using this process. RP CALVERT, JM (reprint author), USN,RES LAB,CTR BIOMOLEC SCI & ENGN,WASHINGTON,DC 20375, USA. NR 21 TC 26 Z9 26 U1 1 U2 5 PU ELECTROCHEMICAL SOC INC PI PENNINGTON PA 10 SOUTH MAIN STREET, PENNINGTON, NJ 08534 SN 0013-4651 J9 J ELECTROCHEM SOC JI J. Electrochem. Soc. PD JUN PY 1992 VL 139 IS 6 BP 1677 EP 1680 DI 10.1149/1.2069475 PG 4 WC Electrochemistry; Materials Science, Coatings & Films SC Electrochemistry; Materials Science GA HX978 UT WOS:A1992HX97800035 ER PT J AU WU, C BLANK, DA AF WU, C BLANK, DA TI THE EFFECTS OF COMBUSTION ON A WORK-OPTIMIZED ENDO-REVERSIBLE OTTO CYCLE SO JOURNAL OF THE INSTITUTE OF ENERGY LA English DT Article AB The work potential of an endo-reversible Otto cycle with combustion is analysed and optimised. (An endo-reversible cycle is one in which the heating process by combustion and the heat-removal process to the surroundings are the only irreversible processes in the cycle.) A mathematical expression is derived and optimised for the work output of the cycle. This paper provides a criterion other than thermal efficiency, mean effective pressure or detonation for the evaluation of the performance and suitability of an Otto engine. RP WU, C (reprint author), USN ACAD,DEPT MECH ENGN,ANNAPOLIS,MD 21402, USA. NR 0 TC 22 Z9 23 U1 0 U2 2 PU INST ENERGY PI LONDON PA 18 DEVONSHIRE ST PORTLAND PLACE, LONDON, ENGLAND W1N 2AU SN 0144-2600 J9 J I ENERGY JI J. Inst. Energy PD JUN PY 1992 VL 65 IS 463 BP 86 EP 89 PG 4 WC Energy & Fuels SC Energy & Fuels GA JC300 UT WOS:A1992JC30000004 ER PT J AU SINGH, A TSAO, LI MARKOWITZ, M GABER, BP AF SINGH, A TSAO, LI MARKOWITZ, M GABER, BP TI METAL-ION INDUCED PHASE-CHANGES IN SELF-ASSEMBLED MEMBRANES SO LANGMUIR LA English DT Article ID BILAYER-MEMBRANE; SURFACE; BIOMEMBRANES; MOLECULES AB The potential of metal binding amphiphiles in bilayer assemblies as components for metal ion detection is studied. Single chain amphiphiles (1-4) equipped with an azobenzene chromophore in the alkyl chain and a cyclic tetraamine, cyclam, in the headgroup region were synthesized. In these compounds cyclam functions as the metal binding site and azobenzene reports the binding event optically. The surfactant nature of cyclam amphiphiles was studied by Langmuir film balance and electron microscopic techniques. The aggregation behavior of free and metal-bound cyclam amphiphiles incorporated in dihexadecyldimethylammonium bromide (5) bilayers was studied spectrophotometrically. The cyclam azobenzene amphiphiles (receptrans) aggregate in the 5 bilayers (4:5, 1:30 molar ratio) below the chain melting temperature of 5 (27.3-degrees-C) to produce a hypsochromic shift (lambda(max) 356 to 326 nm) and deaggregate above 27.3-degrees-C as evidenced by reemergence of the 356-nm peak. Metal ion (e.g. Cu2+) binding stabilizes the aggregate up to 45-degrees-C, above which an absorption maximum at 356 nm (for monomer lipid) is observed. The relevance of the spectral shift due to metal-cyclam interaction in the development of an efficient metal ion detector is discussed. C1 GEORGETOWN UNIV,DEPT BIOCHEM & MOLEC BIOL,WASHINGTON,DC 20007. RP SINGH, A (reprint author), USN,RES LAB,CTR BIOMOLEC SCI & ENGN,CODE 6090,WASHINGTON,DC 20375, USA. NR 27 TC 19 Z9 19 U1 0 U2 3 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0743-7463 J9 LANGMUIR JI Langmuir PD JUN PY 1992 VL 8 IS 6 BP 1570 EP 1577 DI 10.1021/la00042a013 PG 8 WC Chemistry, Multidisciplinary; Chemistry, Physical; Materials Science, Multidisciplinary SC Chemistry; Materials Science GA JA583 UT WOS:A1992JA58300013 ER PT J AU WASHBURN, A AF WASHBURN, A TI PRESENT VALUES WITH RENEWALS SO MANAGEMENT SCIENCE LA English DT Article DE PRESENT VALUE; DISCOUNT AB Expected present values can be calculated in the presence of a sequence of events that cause the cash flow process to restart after each one. Methods are derived and illustrated by examples. RP WASHBURN, A (reprint author), USN,POSTGRAD SCH,DEPT OPERAT RES,MONTEREY,CA 93943, USA. NR 10 TC 2 Z9 2 U1 0 U2 1 PU INST OPERATIONS RESEARCH MANAGEMENT SCIENCES PI LINTHICUM HTS PA 901 ELKRIDGE LANDING RD, STE 400, LINTHICUM HTS, MD 21090-2909 SN 0025-1909 J9 MANAGE SCI JI Manage. Sci. PD JUN PY 1992 VL 38 IS 6 BP 846 EP 850 DI 10.1287/mnsc.38.6.846 PG 5 WC Management; Operations Research & Management Science SC Business & Economics; Operations Research & Management Science GA JA621 UT WOS:A1992JA62100008 ER PT J AU DURHAM, DL LEWIS, JK AF DURHAM, DL LEWIS, JK TI OCEANIC AND ATMOSPHERIC NOWCASTING AND FORECASTING - INTRODUCTION SO MARINE TECHNOLOGY SOCIETY JOURNAL LA English DT Editorial Material C1 ATLANTIC APPL RES CORP,LONG BEACH,MS. RP DURHAM, DL (reprint author), USN,OCEANOG COMMAND,BAY ST LOUIS,MS, USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU MARINE TECHNOLOGY SOC INC PI WASHINGTON PA C/O I CLAYION MATTHEWS, 1828 L ST, NW, 9TH FL, WASHINGTON, DC 20036 SN 0025-3324 J9 MAR TECHNOL SOC J JI Mar. Technol. Soc. J. PD SUM PY 1992 VL 26 IS 2 BP 3 EP 4 PG 2 WC Engineering, Ocean; Oceanography SC Engineering; Oceanography GA JJ389 UT WOS:A1992JJ38900001 ER PT J AU HARDING, JM MAY, P POLLAK, KD CLANCY, RM AF HARDING, JM MAY, P POLLAK, KD CLANCY, RM TI A SEASONAL SKILL COMPARISON BETWEEN OPERATIONAL OCEAN THERMAL STRUCTURE PRODUCTS IN THE NORTHEAST ATLANTIC NORWEGIAN SEA SO MARINE TECHNOLOGY SOCIETY JOURNAL LA English DT Article ID SYSTEM; MODEL AB The U.S. Navy's Fleet Numerical Oceanography Center has several operational products available for thermal structure nowcasts in the northeast Atlantic/Norwegian Sea. These include regional nowcasts and short forecasts at 40 km resolution, global nowcasts and short forecasts at 190 km resolution, and two thermal climatologies at 50 km and 380 km resolutions. We propose two hypotheses: (1) that the inclusion of real-time data in the nowcasts and forecasts improves nowcast skill over the use of climatology alone and (2) that increased real-time product resolution increases nowcast skill. This study addresses these hypotheses by comparing the six products listed above in the northeast Atlantic/Norwegian Sea region on a seasonal basis. We extracted daily bathythermograph (BT) data from the real-time operational database in a 2,000 km diameter region centered on the Iceland-Faeroe Front from July 1989 through June 1990. We then compared each BT to the spatially-interpolated results from each of the six operational products. All comparisons were made prior to the BTs assimitation into the real-time products. For each season, we then accumulated three months of results to form a root-mean-square deviation of a given product relative to the verifying BTs. In this region, the results indicate that the real-time nowcasts perform better than both climatologies in autumn and winter. The results also demonstrate the advantage of increased resolution in fall and winter, but not as strongly. The spring and summer results do not produce definitive conclusions. C1 FLEET NUMER OCEANOG CTR,DIV OCEAN MODELS,MONTEREY,CA. RP HARDING, JM (reprint author), USN,RES LAB,BAY ST LOUIS,MS, USA. NR 18 TC 0 Z9 0 U1 0 U2 1 PU MARINE TECHNOLOGY SOC INC PI WASHINGTON PA C/O I CLAYION MATTHEWS, 1828 L ST, NW, 9TH FL, WASHINGTON, DC 20036 SN 0025-3324 J9 MAR TECHNOL SOC J JI Mar. Technol. Soc. J. PD SUM PY 1992 VL 26 IS 2 BP 15 EP 22 PG 8 WC Engineering, Ocean; Oceanography SC Engineering; Oceanography GA JJ389 UT WOS:A1992JJ38900003 ER PT J AU METZGER, EJ HURLBURT, HE KINDLE, JC SIRKES, Z PRINGLE, JM AF METZGER, EJ HURLBURT, HE KINDLE, JC SIRKES, Z PRINGLE, JM TI HINDCASTING OF WIND-DRIVEN ANOMALIES USING A REDUCED-GRAVITY GLOBAL OCEAN MODEL SO MARINE TECHNOLOGY SOCIETY JOURNAL LA English DT Article ID GEOSAT AB Global versions of the Navy Layered Ocean Model are used to hind cast wind-driven oceanic anomalies. These versions are reduced-gravity with the lowest layer infinitely deep and at rest, and grid resolutions of 1/2-degrees and 1/4-degrees are used. Winds at the 1000 millibar level from the European Centre for Medium-Range Weather Forecasts (ECMWF) are used as forcing functions for the models over the 1981 to 1989 time frame. The ability of the models to reproduce wind-forced anomalies on intraseasonal to interannual time scales is studied by comparing the model solutions with various observational data sets. These include satellite altimetry data, drifting buoy data, and island and coastal sea level data. The effects of varying horizontal and vertical resolution are also detailed. The models are able to hindcast many of the wind-driven anomalies; the best correlation is found in the tropical regions where the oceanic response to atmospheric forcing is the most rapid. At mid-latitudes, mesoscale flow instabilities are a major source of oceanic anomalies. However, the resolution of the global models used here is not adequate for these. In addition, the reduced-gravity models lack the barotropic mode and realistic bottom topography, which can play an important role in the flow instabilities. C1 INST NAVAL OCEANOG,BAY ST LOUIS,MS. PLANNING SYST INC,SLIDELL,LA. RP METZGER, EJ (reprint author), USN,RES LAB,BAY ST LOUIS,MS, USA. NR 23 TC 32 Z9 32 U1 0 U2 0 PU MARINE TECHNOLOGY SOC INC PI WASHINGTON PA C/O I CLAYION MATTHEWS, 1828 L ST, NW, 9TH FL, WASHINGTON, DC 20036 SN 0025-3324 J9 MAR TECHNOL SOC J JI Mar. Technol. Soc. J. PD SUM PY 1992 VL 26 IS 2 BP 23 EP 32 PG 10 WC Engineering, Ocean; Oceanography SC Engineering; Oceanography GA JJ389 UT WOS:A1992JJ38900004 ER PT J AU BENNETT, T BOYD, J KNAUER, L DAWSON, G WILSON, W AF BENNETT, T BOYD, J KNAUER, L DAWSON, G WILSON, W TI A FEATURE MODEL OF THE ICELAND FAEROE FRONT SO MARINE TECHNOLOGY SOCIETY JOURNAL LA English DT Article ID AREA AB The sparsity of data, especially at depth, is a major impediment to effective real-time mapping of the mesoscale ocean thermal structure. Feature models, which are descriptions of the typical large-scale structure of ocean fronts and eddies, can be used to infer the subsurface structure of ocean features from observations of their surface locations. These models are a powerful means to supplement observations with a knowledge of the oceanography of the features. A feature model for the Iceland Faeroe Front is presented. The model maps the frontal surface in a vertical plane between its location at the surface and its assumed fixed location on the bottom along the Iceland Faeroe Ridge. The output from the feature model is an inferred temperature profile that is the weighted sum of the two canonical profiles (i.e., water mass climatologies) on either side of the front. The weighting is a function of the distance to the frontal surface. An ensemble of these profiles describes the front. A comparison of model-generated and observed horizontal and vertical temperature sections shows good agreement. C1 PLANNING SYST INC,SLIDELL,LA. RP BENNETT, T (reprint author), USN,RES LAB,BAY ST LOUIS,MS, USA. NR 24 TC 3 Z9 5 U1 1 U2 1 PU MARINE TECHNOLOGY SOC INC PI WASHINGTON PA C/O I CLAYION MATTHEWS, 1828 L ST, NW, 9TH FL, WASHINGTON, DC 20036 SN 0025-3324 J9 MAR TECHNOL SOC J JI Mar. Technol. Soc. J. PD SUM PY 1992 VL 26 IS 2 BP 44 EP 52 PG 9 WC Engineering, Ocean; Oceanography SC Engineering; Oceanography GA JJ389 UT WOS:A1992JJ38900006 ER PT J AU SZCZECHOWSKI, C AF SZCZECHOWSKI, C TI COMPARISON OF SATELLITE-DERIVED GULF-STREAM FRONT AND EDDY ANALYSES WITH GEOSAT UNDERFLIGHT AXBT DATA SO MARINE TECHNOLOGY SOCIETY JOURNAL LA English DT Article AB Frontal analyses in the Gulf Stream area, derived from satellite imagery and altimetry, are compared with AXBT (airborne expendable bathythermograph) transect data. The qualitative and quantitative comparisons serve two purposes. (1) to establish the accuracy and consistency of the satellite-derived frontal analyses and (2) to examine the spatial relationships between the frontal positions derived from IR (infrared) imagery, altimetry, and the AXBT data. The common basis for the quantitative comparisons is the AXBT-derived subsurface frontal position (15-degrees-C at 200 m). Quantitative comparisons indicate that (1) the IR imagery-observed surface front is displaced 8+/-13 km to the north of the subsurface front, (2) the subsurface frontal path inferred from the imagery-observed surface path (via the PATHFINDER model) typically overshoots the AXBT-derived subsurface front by about 5 km to the south, and (3) the altimeter-derived frontal position shows a mean northward displacement from the subsurface front of about 24+/-14 km. It is also demonstrated that adjusting the altimeter-derived frontal position by the mean separation distance can produce a reliable subsurface frontal position estimate in times when imagery-derived surface paths are lacking due to cloud cover or other factors. RP SZCZECHOWSKI, C (reprint author), USN,OCEANOG OFF,BAY ST LOUIS,MS, USA. NR 19 TC 0 Z9 0 U1 0 U2 0 PU MARINE TECHNOLOGY SOC INC PI WASHINGTON PA C/O I CLAYION MATTHEWS, 1828 L ST, NW, 9TH FL, WASHINGTON, DC 20036 SN 0025-3324 J9 MAR TECHNOL SOC J JI Mar. Technol. Soc. J. PD SUM PY 1992 VL 26 IS 2 BP 53 EP 62 PG 10 WC Engineering, Ocean; Oceanography SC Engineering; Oceanography GA JJ389 UT WOS:A1992JJ38900007 ER PT J AU PHOEBUS, PA GOERSS, JS AF PHOEBUS, PA GOERSS, JS TI THE ASSIMILATION OF MARINE SURFACE DATA INTO THE NAVY OPERATIONAL GLOBAL ATMOSPHERIC PREDICTION SYSTEM SO MARINE TECHNOLOGY SOCIETY JOURNAL LA English DT Article ID WIND-SPEED AB As numerical models of the ocean and the atmosphere become more sophisticated, it becomes necessary to account for the interchange of energy at the air/sea interface. Meteorological models require accurate estimates of sea surface temperature and ice fields. Oceanographic models require accurate estimates of the surface winds and heat fluxes. Thus, it is beneficial for scientists in each discipline to have some level of understanding and appreciation for how these various parameters are obtained. With that in mind, we will describe how a meteorological analysis/forecast system uses marine data to estimate the surface wind field, with particular emphasis on the analysis process and the resulting nowcast product. The Navy's data analysis system uses the multivariate optimum interpolation technique to produce updates to background fields provided by the forecast model. The advantage of this technique is that the relative weights given the background and the observations are determined by taking into account the estimated error properties of each. As new data sources become available, the appropriate statistics defining the errors of the observations must be determined. Since we have recently added several new data sources to the assimilation cycle, new values of the observation errors have been determined for all marine surface data. The improvements made by these new data sources, including special sensor microwave/imager wind speeds and synthetic tropical observations, will also be illustrated. RP PHOEBUS, PA (reprint author), USN,RES LAB,MONTEREY,CA 93940, USA. NR 19 TC 2 Z9 2 U1 0 U2 0 PU MARINE TECHNOLOGY SOC INC PI WASHINGTON PA C/O I CLAYION MATTHEWS, 1828 L ST, NW, 9TH FL, WASHINGTON, DC 20036 SN 0025-3324 J9 MAR TECHNOL SOC J JI Mar. Technol. Soc. J. PD SUM PY 1992 VL 26 IS 2 BP 63 EP 77 PG 15 WC Engineering, Ocean; Oceanography SC Engineering; Oceanography GA JJ389 UT WOS:A1992JJ38900008 ER PT J AU LEWIS, JK VAYDA, GA HSU, YL AF LEWIS, JK VAYDA, GA HSU, YL TI COUPLING REGIONAL AND GLOBAL TIDE MODELS SO MARINE TECHNOLOGY SOCIETY JOURNAL LA English DT Article ID OCEAN AB A two-dimensional numerical model was used to study appropriate conditions at the open boundaries for a regional model forced by parameters from a global tidal model (Schwiderski, 1981; 1983). The open boundary condition of Reid and Bodine (1968) was applied to regional models of the north-central Gulf of Mexico and of the western Florida shelf. A number of tests were conducted to determine how well forcing using the tidal constants from the 1-degree X 1-degree Schwiderski global model could reproduce the M2 and O1 tides as determined from observations and the 15' X 15' Gulf of Mexico model of Reid and Whitaker (1981). The Reid and Bodine formulation was quite effective in driving the regional models while still allowing wave energy to propagate through the open boundaries and out of the model. Tests with one open boundary of the north-central Gulf regional model having just a radiation or a zero-gradient condition (but no tidal forcing for either) failed to reproduce the known tides. Apparently, the pure radiation or zero-gradient condition along one open boundary can result in interior solutions to the tidal forcing that can be quite different from the actual tides. The results indicate that tidal forcing is required at all open boundaries to reproduce observed and model-predicted tidal variations. The western Florida shelf is known to resonate with the M2 tide. Under such circumstances, the bottom friction becomes quite important in obtaining correct predictions of the observed tidal amplitudes. Several bottom friction schemes with varying drag coefficients were tested for both the central Gulf and Florida models. The results are discussed in light of the fact that we seek one scheme that would be applicable for both resonant and non-resonant situations. C1 SCI APPLICAT INTL CORP,BAY ST LOUIS,MS. USN,OCEANOG & ATMOSPHER RES LAB,DIV MAPPING CHARTING & GEODESY,BAY ST LOUIS,MS. RP LEWIS, JK (reprint author), ATLANTIC APPL RES CORP,LONG BEACH,MS, USA. NR 18 TC 1 Z9 1 U1 0 U2 0 PU MARINE TECHNOLOGY SOC INC PI WASHINGTON PA C/O I CLAYION MATTHEWS, 1828 L ST, NW, 9TH FL, WASHINGTON, DC 20036 SN 0025-3324 J9 MAR TECHNOL SOC J JI Mar. Technol. Soc. J. PD SUM PY 1992 VL 26 IS 2 BP 78 EP 87 PG 10 WC Engineering, Ocean; Oceanography SC Engineering; Oceanography GA JJ389 UT WOS:A1992JJ38900009 ER PT J AU TSUI, T JURKEVICS, A AF TSUI, T JURKEVICS, A TI A DATABASE-MANAGEMENT SYSTEM-DESIGN FOR METEOROLOGICAL AND OCEANOGRAPHIC APPLICATIONS SO MARINE TECHNOLOGY SOCIETY JOURNAL LA English DT Article AB To satisfy the database management needs of a generic meteorological and oceanographic nowcasting workstation, a software system based on a set of design guidelines derived from today's and future data processing requirements was developed. This software system consists of a set of generic database management tools that handle the current and anticipated future geophysical data sets, unify the data access interface protocols, provide data ingest/export utilities, and support database inventory browsing functions. Currently, the system handles geostationary and polar orbiting satellite image data, numerical weather and ocean prediction model output, climatological and geographic data, terrain and bathymetric data, and conventional as well as satellite observations. This system is called Naval Environmental Operational Nowcasting System (NEONS). The obvious difference between the NEONS approach and other environmental database management systems is the employment of a commercial relational database management system (DBMS) to perform the actual data query, access, and routine database management operations. However, there is also a fundamental difference in the system design whereby NEONS uses the generic data type approach and mainly manages the attributes of data sets. This approach presents a high-level logical view of diverse environmental data sets to users, optimizes the data retrieval efficiency, and insulates the applications programs from the commercial computer hardware and software. As a result, NEONS is readily portable to a variety of UNIX(R) computer workstations and mainframes. RP TSUI, T (reprint author), USN,RES LAB,MONTEREY,CA 93940, USA. NR 9 TC 1 Z9 1 U1 0 U2 2 PU MARINE TECHNOLOGY SOC INC PI WASHINGTON PA C/O I CLAYION MATTHEWS, 1828 L ST, NW, 9TH FL, WASHINGTON, DC 20036 SN 0025-3324 J9 MAR TECHNOL SOC J JI Mar. Technol. Soc. J. PD SUM PY 1992 VL 26 IS 2 BP 88 EP 97 PG 10 WC Engineering, Ocean; Oceanography SC Engineering; Oceanography GA JJ389 UT WOS:A1992JJ38900010 ER PT J AU HOGAN, PJ HURLBURT, HE JACOBS, G WALLCRAFT, AJ TEAGUE, WJ MITCHELL, JL AF HOGAN, PJ HURLBURT, HE JACOBS, G WALLCRAFT, AJ TEAGUE, WJ MITCHELL, JL TI SIMULATION OF GEOSAT, TOPEX/POSEIDON, AND ERS-1 ALTIMETER DATA FROM A 1/8-DEGREES PACIFIC-OCEAN MODEL - EFFECTS OF SPACE-TIME RESOLUTION ON MESOSCALE SEA-SURFACE HEIGHT VARIABILITY SO MARINE TECHNOLOGY SOCIETY JOURNAL LA English DT Article ID EXPENDABLE BATHYTHERMOGRAPH; TROPICAL PACIFIC; LEVEL; PREDICTION; PROFILES; STRESS; ERROR AB Effects of spatial and temporal sampling by satellite altimeters are investigated using a 1/8-degrees eddy resolving model of the Pacific Ocean. The model is used to sample sea surface height along groundtracks that correspond in space and repeat interval with GEOSAT Exact Repeat Mission (GEOSAT-ERM), the TOPEX/Poseidon, and the ERS-1 satellite altimeters. The GEOSAT-ERM tracks correspond in time as well. Variability maps of sea surface topography are computed for Kuroshio Extension subregion at the space-time scale of the model as well as the space-time scales of the model-simulated altimeter data. The variability maps are interpolated to a regular grid with an objective analysis scheme that minimizes the normalized root-mean-square slope error based on optimal parameters for the influence function. These were determined for each satellite configuration using the simulated altimeter data. Variability from the model-simulated GEOSAT data is also compared to variability from the actual GEOSAT-ERM. Both variability maps show a corridor of high variability along the axis of the Kuroshio Extension and both have local maxima within that corridor, but at slightly different longitudes. The results indicate that the ERS-1 altimeter, which has the closest track spacing, is most able to reproduce the benchmark variability map computed from the 1/8-degrees model grid sampled every three days; the TOPEX/Poseidon altimeter has the widest track spacing and is least able to reproduce the same benchmark variability map. The results also indicate that the mesoscale variability maps in this region are affected more by the spatial than by the temporal sampling interval. When three beams are used to sample the model along GEOSAT groundtracks and groundtracks 50 km to either side, the resulting variability map is nearly identical to the variability computed from the 1/8-degrees model grid sampled every three days. It is demonstrated that using both ascending and descending track data (as opposed to a single set of track data) improves the ability to map mesoscale variability sampled along TOPEX/Poseidon groundtracks, but only slightly for GEOSAT-ERM groundtracks. Effects of orbit error removal are investigated by applying tilt-bias and quadratic "corrections" to the noise-free simulated altimeter data generated by the ocean model. The results show that when these corrections are applied to the Kuroshio Extension subdomain, anomalous edge effects are produced at the end of the groundtracks along the southern boundary, and that areas where gradients in the sea surface topography are steepest show the largest spurious changes in sea surface height variability caused by these "corrections." C1 USN,RES LAB,BAY ST LOUIS,MS. PLANNING SYST INC,SLIDELL,LA. RP HOGAN, PJ (reprint author), SVERDRUP TECHNOL INC,BAY ST LOUIS,MS, USA. RI Jacobs, Gregg/C-1456-2008 NR 23 TC 8 Z9 8 U1 0 U2 0 PU MARINE TECHNOLOGY SOC INC PI WASHINGTON PA C/O I CLAYION MATTHEWS, 1828 L ST, NW, 9TH FL, WASHINGTON, DC 20036 SN 0025-3324 J9 MAR TECHNOL SOC J JI Mar. Technol. Soc. J. PD SUM PY 1992 VL 26 IS 2 BP 98 EP 107 PG 10 WC Engineering, Ocean; Oceanography SC Engineering; Oceanography GA JJ389 UT WOS:A1992JJ38900011 ER PT J AU SHARP, WG AF SHARP, WG TI REPEALING THE WAR POWERS RESOLUTION, RESTORING THE RULE OF LAW IN UNITED-STATES-FOREIGN-POLICY - TURNER,RF SO MILITARY LAW REVIEW LA English DT Book Review RP SHARP, WG (reprint author), USN,DIV INT LAW,OFF JUDGE ADVOCATE GEN,WASHINGTON,DC 20350, USA. NR 1 TC 0 Z9 0 U1 0 U2 0 PU JUDGE ADVOCATE GENERALS SCHOOL PI CHARLOTTESVILLE PA US ARMY, CHARLOTTESVILLE, VA 22903-1781 SN 0026-4040 J9 MIL LAW REV JI Milit. Law Rev. PD SUM PY 1992 VL 137 BP 246 EP 253 PG 8 WC Law SC Government & Law GA JU573 UT WOS:A1992JU57300008 ER PT J AU MISHIK, AN FERRY, FT AF MISHIK, AN FERRY, FT TI THE UTILIZATION OF MEDICAL AND NONMEDICAL SPECIALTIES IN THE ASSESSMENT OF CHILD-ABUSE IN THE MILITARY COMMUNITY SO MILITARY MEDICINE LA English DT Article AB The Family Advocacy Program is a Department of Defense-mandated program that is administered individually by the branches of the U.S. Armed Forces. Factors were sought that may influence the ultimate disposition of a suspected abuse case on a given base, Navy Child Abuse Subcommittees were exclusively chaired by pediatricians, while the Army and the Air Force used social workers and psychologists. The Army and Air Force used the same medical specialists to run the larger Family Advocacy Programs, while the Navy used non-medical active duty officers. Base authorities made the final judgment to implement a treatment plan more frequently at Navy and Army commands. The implications of overutilization of medical specialists and increased legal liability of non-medical personnel are discussed. RP MISHIK, AN (reprint author), USN HOSP,DEPT PEDIAT,CHERRY POINT,NC 28533, USA. NR 0 TC 2 Z9 2 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 JUN PY 1992 VL 157 IS 6 BP 291 EP 294 PG 4 WC Medicine, General & Internal SC General & Internal Medicine GA HY168 UT WOS:A1992HY16800008 PM 1620394 ER PT J AU ANDEREGG, CR LYLES, MB AF ANDEREGG, CR LYLES, MB TI GRAPHITE TATTOO - REPORT OF A CASE AND DIFFERENTIAL-DIAGNOSIS SO MILITARY MEDICINE LA English DT Article AB A case report underlining the necessity of the biopsy procedure for a pigmented lesion of unknown origin. A female patient was referred for evaluation of a pigmented lesion on the facial keratinized gingiva coronal to the free gingival margin above tooth No. 7. An excisional biopsy revealed a graphite tattoo. A discussion and differential diagnosis of pigmented lesions follows. RP ANDEREGG, CR (reprint author), USN,CTR DENT,DEPT PERIODONT,LONG BEACH,CA 90822, USA. NR 0 TC 2 Z9 2 U1 0 U2 2 PU ASSN MILITARY SURG US PI BETHESDA PA 9320 OLD GEORGETOWN RD, BETHESDA, MD 20814 SN 0026-4075 J9 MIL MED JI Milit. Med. PD JUN PY 1992 VL 157 IS 6 BP 323 EP 324 PG 2 WC Medicine, General & Internal SC General & Internal Medicine GA HY168 UT WOS:A1992HY16800018 PM 1620404 ER PT J AU WIRTZ, JJ AF WIRTZ, JJ TI COOPERATION AND DISCORD IN UNITED-STATES-SOVIET ARMS-CONTROL - WEBER,S SO MILLENNIUM-JOURNAL OF INTERNATIONAL STUDIES LA English DT Book Review RP WIRTZ, JJ (reprint author), USN,POSTGRAD SCH,MONTEREY,CA 93940, USA. NR 1 TC 0 Z9 0 U1 0 U2 0 PU MILLENNIUM-J INT STUD PI LONDON PA LONDON SCHOOL ECONOMICS HOUGHTON ST, LONDON, ENGLAND WC2A 2AE SN 0305-8298 J9 MILLENNIUM-J INT ST JI Millennium-J. Int. Stud. PD SUM PY 1992 VL 21 IS 2 BP 302 EP 303 PG 2 WC International Relations SC International Relations GA JR712 UT WOS:A1992JR71200027 ER PT J AU MANECKJEE, R MINNA, JD AF MANECKJEE, R MINNA, JD TI BIOLOGICALLY-ACTIVE MK-801 AND SKF-10 047 BINDING-SITES DISTINCT FROM THOSE IN RAT-BRAIN ARE EXPRESSED ON HUMAN LUNG-CANCER CELLS SO MOLECULAR BIOLOGY OF THE CELL LA English DT Article ID SIGMA-RECEPTORS; ASPARTATE NEUROTOXICITY; ANTICONVULSANT MK-801; PHENCYCLIDINE; GROWTH; LINES; DOG; IDENTIFICATION; ANTAGONISTS; ENANTIOMERS AB We have shown previously that cultured human lung cancer cells of different histologic types express multiple opioid receptors that can regulate their growth. In this report, we show that these cells also express specific, saturable, and high-affinity binding sites (Kd approximately 1 nM) for the non-opioid phencyclidine (PCP), {(+)-5-methyl-10,11-dihydro-5H-dibenzo[a,b]cyclohepten-5,10-imine hydrogen maleate} (MK-801) and sigma-N-allylnormetazocine (SKF-10 047) receptor ligands. Characterization of these binding sites showed them to be protein in nature and sensitive to the guanine nucleotide GTP, Pharmacological studies showed that (+) MK-801 and (+) SKF-10 047 competed with each other for their binding sites and also for the methadone binding site present in these cells. However, the mu and delta-opioid ligands did not compete for (+) MK-801 and (+) SKF-10 047 binding sites. In addition, these binding sites on lung cancer cells appear to be distinct from the N-methyl D-aspartate/PCP receptor ionophore complex reported to be present in rat brain. MK-801 and SKF-10 047, at nM concentrations, were found to inhibit the growth of these cells in culture within a few hours of exposure, and this effect was irreversible after 24 h. The growth effects of these ligands could not be reversed by the opioid antagonist naloxone, suggesting involvement of nonopioid type receptors in the actions of these ligands. The abundant expression of biologically active MK-801 and SKF-10 047 binding sites in these cell lines, distinct from those in rat brain, suggests that these cell lines may prove to be a valuable source for further characterization and purification of these binding sites. C1 UNIV TEXAS,SW MED CTR,SIMMON CANC CTR,DALLAS,TX 75235. RP MANECKJEE, R (reprint author), USN,NCI,MED ONCOL BRANCH,DIV CANC TREATMENT,BETHESDA,MD 20889, USA. NR 32 TC 8 Z9 8 U1 0 U2 0 PU AMER SOC CELL BIOLOGY PI BETHESDA PA PUBL OFFICE, 9650 ROCKVILLE PIKE, BETHESDA, MD 20814 SN 1059-1524 J9 MOL BIOL CELL JI Mol. Biol. Cell PD JUN PY 1992 VL 3 IS 6 BP 613 EP 619 PG 7 WC Cell Biology SC Cell Biology GA JD737 UT WOS:A1992JD73700004 PM 1323349 ER PT J AU FETT, RW AF FETT, RW TI MAJOR CLOUD PLUMES IN THE ARCTIC AND THEIR RELATION TO FRONTS AND ICE MOVEMENT SO MONTHLY WEATHER REVIEW LA English DT Article ID SEA ICE AB A study of the movement of orographic cloud plumes from one island to another in the Svalbard-Novaya Zemlya region of the Barents Sea revealed a close association with similar movements of arctic fronts. Strong northerly winds behind arctic fronts, moving southward from over the ice into the Barents Sea, cause a rapid movement of the leading edge of the marginal ice zone (MIZ) in a similar southward direction, opening up many leads and polynyas in the process. This paper shows examples illustrating the effect as documented by Defense Meteorological Satellite Program (DMSP) and National Oceanic and Atmospheric Administration (NOAA) Advanced Very High-Resolution Radiometer (AVHRR) high-resolution picture transmission (HRPT) satellite data. It is worth noting that, despite clear satellite evidence of the movement of two strong arctic fronts into the Barents Sea over a 4-day period, neither American nor Norwegian operational surface analyses were drawn especially well to reflect these events. The study emphasizes the need for forecasters to have ready access to near real-time, high-resolution, satellite imagery over the region on a frequent basis in order to forecast properly the movement of fronts and associated movement of the ice edge toward open waters to the south. RP FETT, RW (reprint author), USN,OCEANOG & ATMOSPHER RES LAB,39003 SER 441-429,MONTEREY,CA 93943, USA. NR 8 TC 1 Z9 1 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 JUN PY 1992 VL 120 IS 6 BP 925 EP 945 DI 10.1175/1520-0493(1992)120<0925:MCPITA>2.0.CO;2 PG 21 WC Meteorology & Atmospheric Sciences SC Meteorology & Atmospheric Sciences GA HW270 UT WOS:A1992HW27000003 ER PT J AU BUTCHER, RJ GILARDI, R FLIPPENANDERSON, JL GEORGE, C AF BUTCHER, RJ GILARDI, R FLIPPENANDERSON, JL GEORGE, C TI DISTORTIONS FROM REGULAR GEOMETRY IN SUBSTITUTED PARANITROANILINES - CRYSTAL AND MOLECULAR-STRUCTURES OF (I) N,N-DIMETHYL-2,4,6-TRINITROANILINE, (II) N-METHYL-2,4,6-TRINITROANILINE, (III) 3-TRIFLUOROMETHYL-2,4,6-TRINITROANILINE, (IV) 3,5-DIHYDROXY-2,4,6-TRINITROANILINE, (V) 3-METHOXY-2,4,6-TRINITROANILINE, (VI) N-ETHYL-2,4,6-TRINITROANILINE.0.5 OCTANE, AND (VII) 3-BROMO-2,4,6-TRINITROANILINE SO NEW JOURNAL OF CHEMISTRY LA English DT Article ID VALENCE BOND STRUCTURES; BENZENE-DERIVATIVES; CONJUGATED MOLECULES; MICROWAVE-SPECTRUM; THROUGH-RESONANCE; PARA-NITROANILINE; NITROBENZENE; ROTATION; SHIFTS; ACID AB The crystal and molecular structures of seven 2,4,6-trinitro derivatives of aniline have been determine For N,N-dimethyl-2,4,6-trinitroaniline (I): monoclinic, P2(1)/a, a = 8.369(1), b = 16.508(3), c = 8.655(2) angstrom, beta = 117.75(1)-degrees, V = 1058.3(3) angstrom3, Z = 4, D = 1.608 g cm-3, R(F) = 0.0510 and R (wF) = 0.0489. For N-methyl-2,4,6-trinitroaniline (II), monoclinic, P2(1)/n, a = 6.5379(9), b = 16.947(2), c = 8.927(1) angstrom, beta = 98.22(1)-degrees, V = 978.9(3) angstrom3, Z = 4, D = 1.643 g cm-3, R(F) = 0.0459 and R (wF) = 0.0541. For 3-trifluoromethyl-2,4,6-trinitroaniline (III), monoclinic, P2(1)/c, a = 7.601(2), b = 9.869(2), c = 13.993(3) angstrom, beta = 104.53(2)-degrees, V = 101 6.0(4) angstrom3, Z = 4, D = 1.936 g cm-3, R(F) = 0.0506 and R(wF) = 0.0573. For 3,5-dihydroxy-2,4,6-trinitroaniline (IV), monoclinic, P2(1)/c, a = 6.3902(9), b = 9.688(2A), c = 14.824(2) angstrom, beta = 96.74(1)-degrees, V = 911.4(2) angstrom3, Z = 4, D = 1.896 g cm-3, R(F) = 0.0476 and R(wF) = 0.0648. For 3-methoxy-2,4,6-trinitroaniline (V), orthorhombic, P2(1)2(1)2(1), a = 4.248(3), b = 8.907(4), c = 26.500(11) angstrom, V = 1002.8(9) angstrom3, Z = 4, D = 1.710 g cm-3, R(F) = 0.0480 and R(wF) = 0.0499. For N-ethyl-2,4,6-trinitroaniline.0.5octane (VI), monoclinic, P2(1)/n, a = 14.595(6), b = 6.213(3), c = 27.774(14) angstrom, beta = 93.05(4)-degrees, V = 2515(2) angstrom3, Z = 8, D = 1.655 g cm-3, R(F) = 0.0962 and R(wF) = 0.0758. For 3-bromo-2,4,6-trinitroaniline, (VII), monoclinic, P2(1)/c, a = 7.646(3), b = 9.573(3), c = 13.256(6) angstrom, beta = 103.04 (3)-degrees, V = 945.3(6) angstrom3, Z = 4, D = 2.157 g cm-3, R(F) = 0.0319, and R(wF) = 0.0337. Molecule I crystallizes as discrete molecules, while II, III, IV, V, VI, and VII are involved in intermolecular hydrogen bonding. Molecules II through VII are involved in strong intramolecular hydrogen bonding interactions between amine (and hydroxyl groups where appropriate) and neighboring nitro groups. Except where involved in intramolecular hydrogen bonding contacts the ortho-nitro groups are twisted out of the aromatic plane. The internal ring angle about the carbon atom to which the amine group is attached has large deviations from 120-degrees, ranging from 112.4(11)-degrees for VI to 116.1(2)-degrees for IV, with a mean value of 113.7(12)-degrees for these seven molecules, while the external angles to the amine group about the same carbon atom range from 121.7(3)-degrees to 125.3(3)-degrees with a mean value of 123.2(10)-degrees. The internal ring angles for the other carbon atoms making up the aromatic ring do not vary from 120-degrees by more than two standard deviations. These seven trinitroaniline molecules show no evidence for quinonoidal resonance forms or for three centered hydrogen bonding interactions seen in other studies involving aromatic nitroaniline molecules. C1 USN,RES LAB,STRUCT MATTER LAB,WASHINGTON,DC 20375. RP BUTCHER, RJ (reprint author), HOWARD UNIV,DEPT CHEM,WASHINGTON,DC 20059, USA. NR 76 TC 15 Z9 15 U1 0 U2 0 PU GAUTHIER-VILLARS PI PARIS PA S P E S-JOURNAL DEPT, 120 BD ST GERMAIN, F-75006 PARIS, FRANCE SN 1144-0546 J9 NEW J CHEM JI New J. Chem. PD JUN PY 1992 VL 16 IS 6 BP 679 EP 692 PG 14 WC Chemistry, Multidisciplinary SC Chemistry GA JP771 UT WOS:A1992JP77100006 ER PT J AU CHAKRABARTI, K SHARMA, J MATHUR, VK ABBUNDI, RJ AF CHAKRABARTI, K SHARMA, J MATHUR, VK ABBUNDI, RJ TI X-RAY PHOTOELECTRON-SPECTROSCOPY, OPTICAL-ABSORPTION AND THERMOLUMINESCENCE STUDIES IN CASO4-TM SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS LA English DT Article ID MECHANISMS; CENTERS; SPECTRA AB XPS studies of the core and molecular orbital electronic levels of CaSO4:Tm have shown that the material is in its proper chemical state (sulfate) and that it is quite resistant to radiation damage. However, at very high doses of X-ray irradiation, in the MGy range, the phosphor shows brown discoloration associated with partial decomposition of the sulfate into sulfite, thiosulfate and smaller amounts, of sulfide. This process of chemical reduction involving the breakup of oxygen atoms from the sulfate ion causes a band tailing at the valence band towards lower binding energy. Similar effects, but to a smaller extent are caused if the phosphor is sintered at about 1000-degrees-C. The sintered phosphor shows increased optical absorption in the UV at about 225 nm and it responds to UV light by yielding thermoluminescence. A thermoluminescence peak at approximately 300-degrees-C can be generated by UV light alone in the sintered material. RP CHAKRABARTI, K (reprint author), USN,CTR SURFACE WARFARE,SILVER SPRING,MD 20903, USA. NR 13 TC 3 Z9 3 U1 1 U2 4 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-583X J9 NUCL INSTRUM METH B JI Nucl. Instrum. Methods Phys. Res. Sect. B-Beam Interact. Mater. Atoms PD JUN PY 1992 VL 69 IS 2-3 BP 322 EP 326 DI 10.1016/0168-583X(92)96025-T PG 5 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Atomic, Molecular & Chemical; Physics, Nuclear SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA JD233 UT WOS:A1992JD23300020 ER PT J AU STACKPOLE, LE ATKINSON, RD YOKLEY, J AF STACKPOLE, LE ATKINSON, RD YOKLEY, J TI CAMPUS-WIDE NETWORK ACCESS TO CD-ROM DATABASES SO ONLINE REVIEW LA English DT Meeting Abstract C1 USN,RES LAB,WASHINGTON,DC 20375. NR 0 TC 0 Z9 0 U1 0 U2 0 PU LEARNED INFORMATION LTD PI OXFORD PA WOODSIDE, HINKSEY HILL, OXFORD, ENGLAND OX1 5AU SN 0309-314X J9 ONLINE REV PD JUN PY 1992 VL 16 IS 3 BP 166 EP 166 PG 1 WC Computer Science, Information Systems; Information Science & Library Science SC Computer Science; Information Science & Library Science GA JU075 UT WOS:A1992JU07500011 ER PT J AU STONEMAN, RC ESTEROWITZ, L AF STONEMAN, RC ESTEROWITZ, L TI EFFICIENT RESONANTLY PUMPED 2.8-MU-M ER-3+ GSGG LASER SO OPTICS LETTERS LA English DT Article ID SOLID-STATE LASERS; ROOM-TEMPERATURE; MU-M; EMISSION; GARNET; DIODE AB Efficient cw operation of the Er3+:GSGG I-4(11/2) --> I-4(13/2) laser transition at 2.8-mu-m is demonstrated at room temperature. The I-4(11/2) upper laser state is directly pumped at 0.97-mu-m. The slope efficiency for the 2.8-mu-m laser is 36%, indicating a greater than unity quantum efficiency. This excess efficiency results from the recycling of population through upconversion out of the lower laser state. RP STONEMAN, RC (reprint author), USN,RES LAB,CODE 6551,WASHINGTON,DC 20375, USA. NR 18 TC 60 Z9 62 U1 3 U2 19 PU OPTICAL SOC AMER PI WASHINGTON PA 2010 MASSACHUSETTS AVE NW, WASHINGTON, DC 20036 SN 0146-9592 J9 OPT LETT JI Opt. Lett. PD JUN 1 PY 1992 VL 17 IS 11 BP 816 EP 818 DI 10.1364/OL.17.000816 PG 3 WC Optics SC Optics GA HU973 UT WOS:A1992HU97300017 PM 19794641 ER PT J AU LIN, HB EVERSOLE, JD CAMPILLO, AJ AF LIN, HB EVERSOLE, JD CAMPILLO, AJ TI CONTINUOUS-WAVE STIMULATED RAMAN-SCATTERING IN MICRODROPLETS SO OPTICS LETTERS LA English DT Article ID DIELECTRIC MICROSPHERES; OPTICAL CAVITIES; DROPLETS; EMISSION AB Continuous-wave stimulated Raman scattering was observed in 11-13-mu-m-diameter benzene and toluene microdroplets at pump intensities as low as 8 and 24 kW/cm2, respectively. Low thresholds were achieved by exploiting simultaneous pump and Stokes wave resonance in the droplets and Raman gains that were cavity QED enhanced approximately 50 times with respect to bulk liquid values. Based on a photon-state conservation argument, the cavity gain enhancement factor may be approximated by the ratio of the spectral spacing between resonant modes of the same order to that of the homogeneous Raman linewidth. This relation appears to be consistent with the relative experimental behavior of benzene, ethanol, and toluene. RP LIN, HB (reprint author), USN,RES LAB,DIV OPT SCI,WASHINGTON,DC 20375, USA. NR 21 TC 43 Z9 43 U1 1 U2 6 PU OPTICAL SOC AMER PI WASHINGTON PA 2010 MASSACHUSETTS AVE NW, WASHINGTON, DC 20036 SN 0146-9592 J9 OPT LETT JI Opt. Lett. PD JUN 1 PY 1992 VL 17 IS 11 BP 828 EP 830 DI 10.1364/OL.17.000828 PG 3 WC Optics SC Optics GA HU973 UT WOS:A1992HU97300021 PM 19794645 ER PT J AU ASKINS, CG TSAI, TE WILLIAMS, GM PUTNAM, MA BASHKANSKY, M FRIEBELE, EJ AF ASKINS, CG TSAI, TE WILLIAMS, GM PUTNAM, MA BASHKANSKY, M FRIEBELE, EJ TI FIBER BRAGG REFLECTORS PREPARED BY A SINGLE EXCIMER PULSE SO OPTICS LETTERS LA English DT Article ID GRATINGS; PHOTOSENSITIVITY AB Narrow-line, permanent Bragg reflection gratings have been created in Ge-doped silica-core optical fibers by interfering beams of a single 20-ns pulse of KrF excimer laser light. Of the fibers studied, the highest reflectance value of approximately 2% was observed with a linewidth (FWHM) of 0.1 nm, which corresponds to a 2-mm grating length with an index modulation of approximately 3 x 10(-5). RP ASKINS, CG (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 10 TC 79 Z9 82 U1 0 U2 6 PU OPTICAL SOC AMER PI WASHINGTON PA 2010 MASSACHUSETTS AVE NW, WASHINGTON, DC 20036 SN 0146-9592 J9 OPT LETT JI Opt. Lett. PD JUN 1 PY 1992 VL 17 IS 11 BP 833 EP 835 DI 10.1364/OL.17.000833 PG 3 WC Optics SC Optics GA HU973 UT WOS:A1992HU97300023 PM 19794647 ER PT J AU HENDERSHOT, DG PAZIK, JC GEORGE, C BERRY, AD AF HENDERSHOT, DG PAZIK, JC GEORGE, C BERRY, AD TI SYNTHESIS AND CHARACTERIZATION OF NEOPENTYL-ANTIMONY AND [(TRIMETHYLSILYL)METHYL]ANTIMONY COMPOUNDS - MOLECULAR-STRUCTURES OF (ME3CCH2)3SB, (ME3CCH2)3SBI2, (ME3SICH2)3SB, AND (ME3SICH2)3SBI2 SO ORGANOMETALLICS LA English DT Article ID CRYSTAL-STRUCTURE; CHEMISTRY; ALUMINUM; BORAZINE; ANALOG; DIMER AB A series of substituted stibines of the general formula RnSbI3-n and RmSbI5-m (R = Me3CCH2 (neopentyl) and Me3SiCH2 ((trimethylsilyl)methyl); n = 1-3; m = 2, 3) have been prepared and characterized. The triorganostibines (neopentyl (1a) and (trimethylsilyl)methyl (2a)) have been synthesized in 80% yield by the reaction of the corresponding Grignard reagent with SbCl3 in diethyl ether. Addition of iodine to a hydrocarbon solution of 1a or 2a affords the five-coordinate complexes R3SbI2 (1b or 2b). Thermal decomposition of 1b or 2b at 170-degrees-C results in the reductive elimination of RI along with the formation of R2SbI (1c or 2c). Compounds 1c or 2c will further react with iodine in an etheral solution at -78-degrees-C to afford R2SbI3 (1d or 2d). These triiodide complexes are thermally unstable at ambient temperature and will eliminate RI, giving rise to RSbI2 (1e or 2e). All compounds have been characterized by their physical properties, H-1 and C-13 NMR, elemental analysis, and infrared spectroscopy. In addition to the spectroscopic techniques, compounds 1a, 1b, 2a, and 2b have been subjected to single-crystal X-ray diffraction studies. Compounds 1a and 2a are virtually isomorphous and crystallize in the hexagonal space group P6(3) with unit cell parameters for 1a of a = 10.069 (2) angstrom, c = 10.296 (3) angstrom, V, 904.0 (4) angstrom3 for Z = 2. Unit cell parameters for 2a are a = 10.692 (2) angstrom, c = 10.518 (4) angstrom, V = 1041.3 (5) angstrom3 for Z = 2. Refinement of data for 2a converged at R = 0.0211 (R(w) = 0.0244) based on 691 observed reflections with F greater-than-or-equal-to 3.0-sigma(F). Both compounds adopt a pyramidal geometry about the antimony center which lies on a crystallographic 3-fold axis. Compounds 1b and 2b are also nearly isomorphous and crystallize in the monoclinic space group Cc with unit cell parameters for 1b of a = 10.012 (1) angstrom, b = 17.215 (4) angstrom, c = 12.828 (3) angstrom, beta = 106.07 (1)-degrees, V = 2124.6 (7) angstrom3 for Z = 4. Unit cell parameters for 2b are a = 10.647 (2) angstrom, b = 18.283 (4) angstrom, c = 13.124 (2), beta = 105.780 (10)-degrees, V = 2458.4 (8) A1 for Z = 4. Structure refinement for 1b converged at R = 0.0262 (R(w) = 0.0286) based on 1878 observed reflections with F greater-than-or-equal-to 3.0-sigma(F). These compounds deviate only slightly from the expected tbp geometry with an axial I-Sb-I bond angle of 179.0 (1)-degrees. Average Sb-C and Sb-I bond distances are 2.171 (8) and 2.900 (1) angstrom, respectively. C1 USN,RES LAB,STRUCT MATTER LAB,WASHINGTON,DC 20375. RP HENDERSHOT, DG (reprint author), USN,RES LAB,DIV CHEM,CODE 6120,WASHINGTON,DC 20375, USA. NR 39 TC 14 Z9 14 U1 0 U2 2 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0276-7333 J9 ORGANOMETALLICS JI Organometallics PD JUN PY 1992 VL 11 IS 6 BP 2163 EP 2168 DI 10.1021/om00042a033 PG 6 WC Chemistry, Inorganic & Nuclear; Chemistry, Organic SC Chemistry GA HY674 UT WOS:A1992HY67400033 ER PT J AU OBRIEN, F AF OBRIEN, F TI APPROXIMATION METHODS IN DISCRETE SPATIAL DENSITY ANALYSIS FOR FINITE POPULATIONS SO PERCEPTUAL AND MOTOR SKILLS LA English DT Article AB The author's three-parameter square-root model for the measurement of discrete spatial density in human Populations was previously derived under the assumption that exact coordinate locations of the density points were available. The model, called the population density index (PDI) model, has been expanded to include a set of routines for calculating two-dimensional spatial density measures based upon in situ geometric approximations of the interobject Euclidean distance measure for any finite sample size. The derivation and specification of the algorithm for the abbreviated calculation routines are presented and exemplified. The author has been able to apply the methods of the PDI model to submarine environments at the U.S. Naval Underwater Systems Center, resulting in several U.S. Patent applications. RP OBRIEN, F (reprint author), USN,CTR UNDERWATER SYST,CODE 2211,NEWPORT,RI 02841, USA. NR 12 TC 5 Z9 5 U1 0 U2 0 PU PERCEPTUAL MOTOR SKILLS PI MISSOULA PA PO BOX 9229, MISSOULA, MT 59807 SN 0031-5125 J9 PERCEPT MOTOR SKILL JI Percept. Mot. Skills PD JUN PY 1992 VL 74 IS 3 BP 867 EP 873 DI 10.2466/PMS.74.3.867-873 PN 1 PG 7 WC Psychology, Experimental SC Psychology GA HX385 UT WOS:A1992HX38500034 ER PT J AU AGASSI, D CULLEN, JR AF AGASSI, D CULLEN, JR TI TWIN BOUNDARY FLUX PINNING IN A HIGH-TC SUPERCONDUCTOR SO PHYSICA C LA English DT Article ID YBA2CU3O7-DELTA SINGLE-CRYSTALS; VORTEX STRUCTURE AB The pinning potential due to a twin boundary in an anisotropic, continuous superconductor is calculated in a simple model. The model assumes the twin boundary to constitute a thin superconducting slab, different from and embedded in the host superconductor. Flux pinning is found to originate from two sources in several instances. One is an absolute minimum of the free energy. This type of pinning occurs when the twin boundary slab penetration length is larger than that of the host (weak link). The second pinning source is a surface barrier (local minimum in the free energy) at the interface of two superconductors. This barrier depends, in certain limits, very strongly on the twin boundary thickness and the anisotropy of the host superconductor. The model yields an estimate for the critical current parallel to the twin boundary. RP AGASSI, D (reprint author), USN,CTR SURFACE WEAP,SILVER SPRING,MD 20903, USA. NR 30 TC 15 Z9 15 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0921-4534 J9 PHYSICA C JI Physica C PD JUN 1 PY 1992 VL 195 IS 3-4 BP 277 EP 285 DI 10.1016/0921-4534(92)90351-C PG 9 WC Physics, Applied SC Physics GA HZ233 UT WOS:A1992HZ23300009 ER PT J AU BALLESTER, JL DUNLAP, BI AF BALLESTER, JL DUNLAP, BI TI RADIAL VIBRATIONS OF A SODIUM-ION INSIDE ICOSAHEDRAL C-60 SO PHYSICAL REVIEW A LA English DT Article ID CARBON SHELLS; C-60 AB The very high symmetry of icosahedral C60 suggests that as a first approximation an atom trapped inside C60 would be subject to a potential that is radially symmetric about the center. All-electron local-density-functional calculations of the total energy of a sodium ion as a function of radial displacement from the center along the fivefold axis Of C60 serve to refine such a radial potential. In particular the calculations suggest studying potentials that have minima displaced from the center. An analytic functional form for a radial potential having a positive cusp at the origin is proposed, and the s-wave radial solutions of the corresponding Schrodinger equation are examined. C1 USN,RES LAB,THEORET CHEM SECT,WASHINGTON,DC 20375. RP BALLESTER, JL (reprint author), EMPORIA STATE UNIV,DEPT PHYS,EMPORIA,KS 66801, USA. OI Dunlap, Brett/0000-0003-1356-6559 NR 30 TC 61 Z9 61 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1050-2947 J9 PHYS REV A JI Phys. Rev. A PD JUN 1 PY 1992 VL 45 IS 11 BP 7985 EP 7990 DI 10.1103/PhysRevA.45.7985 PG 6 WC Optics; Physics, Atomic, Molecular & Chemical SC Optics; Physics GA HX677 UT WOS:A1992HX67700044 ER PT J AU KLEIN, BM COHEN, RE AF KLEIN, BM COHEN, RE TI ANHARMONICITY AND THE INVERSE ISOTOPE EFFECT IN THE PALLADIUM-HYDROGEN SYSTEM SO PHYSICAL REVIEW B LA English DT Article ID SUPERCONDUCTING TRANSITION-TEMPERATURE; HIGH-TC SUPERCONDUCTORS; ELECTRONIC-STRUCTURE; LATTICE-DYNAMICS; TOTAL ENERGY; PDHX; PDDX; MODEL; CONSTANTS; HYDRIDES AB We have used the full-potential linearized-augmented-plane-wave (LAPW) method to perform electronic-structure calculations for the palladium-hydrogen system in the rocksalt structure for the static lattice and for the cases of hydrogen displacements in the <100>, <110>, and <111> directions. Utilizing the LAPW total energies, and the approximation of an isotropic anharmonic oscillator, we have determined the zone-center optic modes for PdH, PdD, and PdT and find very good agreement with experiment. Using our lattice-dynamics results and our calculations of the electron-phonon interaction in the rigid-muffin-tin approximation, we have determined the superconducting coupling parameter-lambda and T(c) for these three hydrides. We find that the inverse isotope effect is semiquantitatively accounted for by the anharmonic lattice dynamics, without assuming an explicit dependence of the electron-phonon interaction on hydrogen isotope, in agreement with earlier calculations. However, there is a significant quantitative variation of the isotope effect with the value of the Coulomb pseudopotential parameter-mu*, which must be estimated. We also estimate the effect of pressure on T(c) and on the isotope effect. C1 CARNEGIE INST WASHINGTON,GEOPHYS LAB,CTR HIGH PRESSURE RES,WASHINGTON,DC 20015. RP KLEIN, BM (reprint author), USN,RES LAB,COMPLEX SYST THEORY BRANCH,WASHINGTON,DC 20375, USA. RI Cohen, Ronald/B-3784-2010 OI Cohen, Ronald/0000-0001-5871-2359 NR 52 TC 32 Z9 32 U1 2 U2 8 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD JUN 1 PY 1992 VL 45 IS 21 BP 12405 EP 12414 DI 10.1103/PhysRevB.45.12405 PG 10 WC Physics, Condensed Matter SC Physics GA HX378 UT WOS:A1992HX37800026 ER PT J AU ROBERTSON, DH BRENNER, DW MINTMIRE, JW AF ROBERTSON, DH BRENNER, DW MINTMIRE, JW TI ENERGETICS OF NANOSCALE GRAPHITIC TUBULES SO PHYSICAL REVIEW B LA English DT Note ID CARBON; POLYACETYLENE; C-60 AB Using both empirical potentials and first-principles total-energy methods, we have examined the energetics and elastic properties of all possible graphitic tubules with radii less than 9 angstrom. We find that the strain energy per carbon atom relative to an unstrained graphite sheet varies as 1/R2 (where R is the tubule radius) and is insensitive to other aspects of the lattice structure, indicating that relationships derivable from continuum elastic theory persist well into the small-radius limit. We also predict that this strain energy is much smaller than that in highly symmetric fullerene clusters with similar radii, suggesting a possible thermodynamic preference for tubular structures rather than cage structures. The empirical potentials further predict that the elastic constants along the tubule axis generally soften with decreasing tubule radius, although with a distinct dependence on helical conformation. RP ROBERTSON, DH (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. RI Brenner, Donald/D-1741-2009; OI Mintmire, John/0000-0002-6551-0349 NR 21 TC 786 Z9 792 U1 3 U2 36 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 JUN 1 PY 1992 VL 45 IS 21 BP 12592 EP 12595 DI 10.1103/PhysRevB.45.12592 PG 4 WC Physics, Condensed Matter SC Physics GA HX378 UT WOS:A1992HX37800053 ER PT J AU COHN, JL SKELTON, EF WOLF, SA LIU, JZ AF COHN, JL SKELTON, EF WOLF, SA LIU, JZ TI INPLANE THERMOELECTRIC-POWER OF UNTWINNED YBA2CU3O7-DELTA SO PHYSICAL REVIEW B LA English DT Note ID NORMAL-STATE RESISTIVITY; SINGLE-CRYSTALS; OXIDE SUPERCONDUCTORS; ELECTRONIC-STRUCTURE; YBA2CU3O6.9; ANISOTROPY AB We present the first measurements of the temperature and oxygen-doping dependences of thermoelectric power in the ab plane of untwinned YBa2Cu3O7-delta (delta almost equal to 0.10) for T less than or equal to 330 K. Employing a two-band model and measured electrical resistivities, we derive the chain and plane components of the thermopower, S(ch) and S(pl). The behavior of S(ch) indicates that some of the chain conduction occurs via carriers in a narrow band. S(pl)(T) is similar to the in-plane thermopower of the other cuprates, suggesting a "universal" behavior for the CuO2 planes. The results are discussed with reference to the known Fermi surface. C1 UNIV CALIF DAVIS,DEPT PHYS,DAVIS,CA 95616. RP COHN, JL (reprint author), USN,RES LAB,MAT PHYS BRANCH,WASHINGTON,DC 20375, USA. RI Wolf, Stuart/A-7513-2009 NR 36 TC 66 Z9 66 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 JUN 1 PY 1992 VL 45 IS 22 BP 13140 EP 13143 DI 10.1103/PhysRevB.45.13140 PG 4 WC Physics, Condensed Matter SC Physics GA HZ242 UT WOS:A1992HZ24200075 ER PT J AU COHN, JL SKELTON, EF WOLF, SA LIU, JZ SHELTON, RN AF COHN, JL SKELTON, EF WOLF, SA LIU, JZ SHELTON, RN TI THERMAL-CONDUCTIVITY IN THE AB PLANE OF UNTWINNED YBA2CU3O7-DELTA SO PHYSICAL REVIEW B LA English DT Note ID HIGH-TC SUPERCONDUCTORS; SINGLE-CRYSTALS; ANISOTROPY AB We present measurements of thermal conductivity (kappa) in the ab plane of untwinned YBa2Cu3O7-delta (delta almost equal to 0.10) for T less-than-or-equal-to 200 K. Kappa has been measured with heat flow along both the a and b axes and for two oxygen configurations of the same crystal. The conductivity anisotropy has its maximum value at the conductivity peak (T almost-equal-to 40 K), where we find kappa(a)/kappa(b) almost equal to 1.15 before and after an oxygen anneal. Very little ab anisotropy in the magnitude of kappa is observed in the normal state, though near T(c) the temperature dependences are noticeably different for the two directions: d-kappa/dT>0 along the b axis and d-kappa/dT<0 along the a axis. Near T(c) (T less-than-or-equal-to 110 K) kappa is enhanced slightly for both transport directions, features we attribute to the effect of superconducting fluctuations. C1 UNIV CALIF DAVIS, DEPT PHYS, DAVIS, CA 95616 USA. RP COHN, JL (reprint author), USN, RES LAB, MAT PHYS BRANCH, WASHINGTON, DC 20375 USA. RI Wolf, Stuart/A-7513-2009 NR 24 TC 75 Z9 75 U1 0 U2 4 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 JUN 1 PY 1992 VL 45 IS 22 BP 13144 EP 13147 DI 10.1103/PhysRevB.45.13144 PG 4 WC Physics, Condensed Matter SC Physics GA HZ242 UT WOS:A1992HZ24200076 ER PT J AU HANDLER, RA BERNARD, PS ROVELSTAD, AL SWEARINGEN, JD AF HANDLER, RA BERNARD, PS ROVELSTAD, AL SWEARINGEN, JD TI ON THE ROLE OF ACCELERATING FLUID PARTICLES IN THE GENERATION OF REYNOLDS STRESS SO PHYSICS OF FLUIDS A-FLUID DYNAMICS LA English DT Note ID TRANSPORT AB The connection between Reynolds stress and the kinematical and dynamical processes associated with streamwise fluid particle accelerations in the near-wall region of a fully developed channel flow is investigated. Visualizations of the particle paths contributing most significantly to Reynolds stress via such accelerations show them to be linked with spiraling motions in the cores of vortical structures tilted in the streamwise direction. This contrasts with the action of vortices in sweep and ejection events in which transport occurs through the displacement of fluid particles. A conceptual model for Reynolds stress generation by acceleration transport is suggested and the relative importance of pressure and viscous forces is computed. It is found that viscous forces play the dominant role until y+ greater than or similar to 40 at which point pressure forces become most significant. C1 UNIV MARYLAND,DEPT MECH ENGN,COLLEGE PK,MD 20742. RP HANDLER, RA (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 10 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 0899-8213 J9 PHYS FLUIDS A-FLUID PD JUN PY 1992 VL 4 IS 6 BP 1317 EP 1319 DI 10.1063/1.858407 PG 3 WC Mechanics; Physics, Fluids & Plasmas SC Mechanics; Physics GA HU800 UT WOS:A1992HU80000026 ER PT J AU CHEN, HC AF CHEN, HC TI THE DIOCOTRON INSTABILITY OF A GENERAL RELATIVISTIC ELECTRON-BEAM SO PHYSICS OF FLUIDS B-PLASMA PHYSICS LA English DT Article AB The diocotron instability of a general relativistic electron beam is studied using a macroscopic, cold fluid model. In contrast with the previous treatments where the theoretical analyses are carried out for an annular electron beam in a guided magnetic field, such that plasma frequency << cyclotron frequency, the restriction on the magnitude of the beam density and guiding magnetic field is removed in deriving and solving the general eigenvalue equation. In the limit of long axial wavelengths, a dispersion relation is extracted for the special case of a sharp boundary density profile. The stability properties are investigated for a broad range of beam parameters. The results show that the kink mode can be unstable as the plasma frequency approaches the cyclotron frequency. RP CHEN, HC (reprint author), USN,CTR SURFACE WARFARE,WHITE OAK,SILVER SPRING,MD 20903, USA. NR 9 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 0899-8221 J9 PHYS FLUIDS B-PLASMA PD JUN PY 1992 VL 4 IS 6 BP 1412 EP 1415 DI 10.1063/1.860101 PG 4 WC Physics, Fluids & Plasmas SC Physics GA HX374 UT WOS:A1992HX37400007 ER PT J AU BRADY, RF SIKES, AM AF BRADY, RF SIKES, AM TI RING-OPENING POLYMERIZATION OF SPIROBISLACTONES IN A SOLID ACRYLIC MATRIX SO POLYMER BULLETIN LA English DT Article ID MOIETY AB Acrylic resins have been made with pendant spirobislactone functional groups. These resins form films at room temperature. When heated at 120-degrees-C for 24 h, the films are crosslinked by the reaction of spirobislactone, hydroxyl, and glycidyl groups in the polymer, and an insoluble film is produced. RP BRADY, RF (reprint author), USN,RES LAB,DIV CHEM,MAT CHEM BRANCH,WASHINGTON,DC 20375, USA. NR 22 TC 3 Z9 3 U1 1 U2 1 PU SPRINGER VERLAG PI NEW YORK PA 175 FIFTH AVE, NEW YORK, NY 10010 SN 0170-0839 J9 POLYM BULL JI Polym. Bull. PD JUN PY 1992 VL 28 IS 4 BP 375 EP 380 DI 10.1007/BF00297328 PG 6 WC Polymer Science SC Polymer Science GA HZ992 UT WOS:A1992HZ99200002 ER PT J AU OTTINGER, PF GOODRICH, PJ HINSHELWOOD, DD MOSHER, D NERI, JM ROSE, DV STEPHANAKIS, SJ YOUNG, FC AF OTTINGER, PF GOODRICH, PJ HINSHELWOOD, DD MOSHER, D NERI, JM ROSE, DV STEPHANAKIS, SJ YOUNG, FC TI TRANSPORT OF INTENSE LIGHT-ION BEAMS SO PROCEEDINGS OF THE IEEE LA English DT Article ID Z-DISCHARGE PLASMA; CHANNELS; PROPAGATION AB Theoretical and experimental research concerning two techniques for transporting intense light ion beams is described. The first technique uses the magnetic field associated with a wall-stabilized z-discharge to radially confine and guide the beam, and the second technique uses the magnetic field from a central current-carrying wire. The ion beam for the experiments is generated and weakly focused onto the aperture of the transport system using a pinch-reflex ion diode on the Naval Research Laboratory Gamble II generator. Typically, 1.2-MeV, 100-kA proton beams are transported within radii as small as 1 cm. High efficiency transport of beams has been demonstrated for both techniques over distances of a few meters. Beam charge and current neutralization were also confirmed. In z-discharge channels, beams were transported up to 5 m, and beam currents up to 400 kA have been transported in 2-cm radius channels. Nuclear diagnostics and shadowboxes were used to measure beam transport efficiency and phase space information for comparison with theoretical predictions. Particle transport efficiencies as high as 100% for the z-discharge technique and 80% for the wire-guided technique were observed. Energy losses for transported ions were less than 10% for both techniques. C1 JAYCOR INC,VIENNA,VA 22182. RP OTTINGER, PF (reprint author), USN,RES LAB,DIV PLASMA PHYS,WASHINGTON,DC 20375, USA. NR 35 TC 12 Z9 12 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 0018-9219 J9 P IEEE JI Proc. IEEE PD JUN PY 1992 VL 80 IS 6 BP 1010 EP 1018 DI 10.1109/5.149462 PG 9 WC Engineering, Electrical & Electronic SC Engineering GA JG019 UT WOS:A1992JG01900021 ER PT J AU POPE, KO SHEFFNER, EJ LINTHICUM, KJ BAILEY, CL LOGAN, TM KASISCHKE, ES BIRNEY, K NJOGU, AR ROBERTS, CR AF POPE, KO SHEFFNER, EJ LINTHICUM, KJ BAILEY, CL LOGAN, TM KASISCHKE, ES BIRNEY, K NJOGU, AR ROBERTS, CR TI IDENTIFICATION OF CENTRAL KENYAN RIFT-VALLEY FEVER VIRUS VECTOR HABITATS WITH LANDSAT TM AND EVALUATION OF THEIR FLOODING STATUS WITH AIRBORNE IMAGING RADAR SO REMOTE SENSING OF ENVIRONMENT LA English DT Article ID POLARIZATION SIGNATURE; FORESTED AREAS; EGYPT 1977-78; SCATTERING AB Rift Valley Fever (RVF) is a mosquito-borne virus that affects livestock and humans in Africa. Landsat Thematic Mapper (TM) data are shown to be effective in identifying dambos, intermittently flooded areas that are potential mosquito breeding sites, in an area north of Nairobi, Kenya. Positive results were obtained from a limited test of flood detection in dambos with airborne high resolution L, C, and X band multipolarization synthetic aperture radar (SAR) imagery. L and C bands were effective in detecting flooded dambos, but LHH was by far the best channel for discrimination (p < 0.01) between flooded and nonflooded sites in both sedge and short grass environments. This study demonstrates the feasibility of a combined passive and active remote sensing program for monitoring the location and condition of RVF vector habitats, thus making future control of the disease more promising. C1 NASA,AMES RES CTR,TGS TECHNOL INC,MS 2424,MOFFETT FIELD,CA 94035. GEO ECO ARC RES,LA CANADA,CA. USA,MED RES INST INFECT DIS,FREDERICK,MD 21701. ENVIRONM RES INST MICHIGAN,ANN ARBOR,MI 48107. USN,CTR AIR DEV,WARMINSTER,PA 18974. KENYA TRYPANOSOMIASIS RES INST,KIKUYU,KENYA. USA,MED RES UNIT,NAIROBI,KENYA. NR 26 TC 59 Z9 65 U1 0 U2 4 PU ELSEVIER SCIENCE INC PI NEW YORK PA 655 AVENUE OF THE AMERICAS, NEW YORK, NY 10010 SN 0034-4257 J9 REMOTE SENS ENVIRON JI Remote Sens. Environ. PD JUN PY 1992 VL 40 IS 3 BP 185 EP 196 DI 10.1016/0034-4257(92)90002-2 PG 12 WC Environmental Sciences; Remote Sensing; Imaging Science & Photographic Technology SC Environmental Sciences & Ecology; Remote Sensing; Imaging Science & Photographic Technology GA HW982 UT WOS:A1992HW98200002 ER PT J AU EPPLER, DT FULL, WE AF EPPLER, DT FULL, WE TI POLYNOMIAL TREND-SURFACE ANALYSIS APPLIED TO AVHRR IMAGES TO IMPROVE DEFINITION OF ARCTIC LEADS SO REMOTE SENSING OF ENVIRONMENT LA English DT Article ID POLYNYAS AB Polynomial trend surface analysis was applied to three AVHRR images to determine whether regional trends in image radiance can be removed with this procedure. Results suggest that trend surface techniques can be effective in removing region-scale variation in image radiances that are related to uneven illumination, intermittent cloud cover, and variation in the surface temperature field. The dominant effects of illumination in Channel 2 (visible) data, caused by variable sun angle and proximity of the scene to the terminator, can be minimized by removing (subtracting) the first- and second-order trend surfaces from the raw image. These low-order surfaces also remove regional variation in the surface temperature field, which leads to marginal improvement in binary images derived from Channel 4 (infrared) data. Optimum results for both Channel 2 and Channel 4 data are achieved when the third- and fourth-order surfaces are subtracted to remove local temperature and illumination anomalies that occur at smaller spatial scales, primarily in the vicinity of clouds. Application of higher order surfaces fails to improve image quality. There is some indication that the topography of these higher-order surfaces in part maps regional variation in lead density. Use of a best fit criterion based on a strict variance technique (such as the least-squares method) to define the trend surface limits the effectiveness of the technique in this application. Criteria that allow for data to be weighted based on their distance from the plane about which they cluster are more appropriate to the structure of AVHRR radiance data typical of images that show sea ice. A criterion that incorporates a rule system based on fuzzy logic offers an alternative means of assessing goodness-of-fit that might prove appropriate in this application. C1 WICHITA STATE UNIV,DEPT GEOL,FIMTSI,WICHITA,KS 67208. RP EPPLER, DT (reprint author), USN,OCEANOGR & ATMOSPHER RES LAB,BRANCH OFF,CODE 332,72 LYME RD,HANOVER,NH 03755, USA. NR 20 TC 2 Z9 2 U1 2 U2 2 PU ELSEVIER SCIENCE INC PI NEW YORK PA 655 AVENUE OF THE AMERICAS, NEW YORK, NY 10010 SN 0034-4257 J9 REMOTE SENS ENVIRON JI Remote Sens. Environ. PD JUN PY 1992 VL 40 IS 3 BP 197 EP 218 DI 10.1016/0034-4257(92)90003-3 PG 22 WC Environmental Sciences; Remote Sensing; Imaging Science & Photographic Technology SC Environmental Sciences & Ecology; Remote Sensing; Imaging Science & Photographic Technology GA HW982 UT WOS:A1992HW98200003 ER PT J AU EWBANK, JD FAUST, WL LUO, JY ENGLISH, JT MONTS, DL PAUL, DW DOU, Q SCHAFER, L AF EWBANK, JD FAUST, WL LUO, JY ENGLISH, JT MONTS, DL PAUL, DW DOU, Q SCHAFER, L TI INSTRUMENTATION FOR GAS ELECTRON-DIFFRACTION EMPLOYING A PULSED ELECTRON-BEAM SYNCHRONOUS WITH PHOTOEXCITATION SO REVIEW OF SCIENTIFIC INSTRUMENTS LA English DT Article ID TIME DATA ACQUISITION; ALUMINUM; SPECTRA; SF6 AB A novel instrument is described capable of recording gas electron diffraction (GED) patterns of excited molecular states or transient species with pulsed electron beams. The system incorporates (1) a pulsed optical beam for electronic excitation of materials under study, (2) a synchronously pulsed source of 30-50 keV electrons in a space-charge-limited beam, (3) necessary vacuum environment and sample-handling capabilities, and (4) detection and signal processing equipment using an on-line procedure developed at the University of Arkansas. Data obtained for several test gases demonstrate successful operation of the instrument. The 193 nm laser photofragmentation of carbon disulfide, CS2, is described in detail. In agreement with a recent time-of-flight mass spectrometric study of the same process, carbon monosulfide was observed as the reaction product. This study is the first quantitatively successful joint exercise of on-line multichannel GED data recording and a stroboscopic electron source. The method is expected to be generally useful in determining the structures of excited molecular states or reactive species, and it may enable studies of time-dependent phenomena. The current time resolution is approximately 20 ns. C1 USN,RES LAB,WASHINGTON,DC 20375. E CHINA UNIV CHEM TECHNOL,CHEM PHYS LAB,SHANGHAI 200237,PEOPLES R CHINA. MISSISSIPPI STATE UNIV,DEPT PHYS & ASTRON,MISSISSIPPI STATE,MS 39762. RP EWBANK, JD (reprint author), UNIV ARKANSAS,DEPT CHEM & BIOCHEM,FAYETTEVILLE,AR 72701, USA. NR 33 TC 23 Z9 23 U1 1 U2 3 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0034-6748 J9 REV SCI INSTRUM JI Rev. Sci. Instrum. PD JUN PY 1992 VL 63 IS 6 BP 3352 EP 3358 DI 10.1063/1.1142552 PG 7 WC Instruments & Instrumentation; Physics, Applied SC Instruments & Instrumentation; Physics GA HX692 UT WOS:A1992HX69200020 ER PT J AU FLEMING, B AF FLEMING, B TI 'ON BECOMING HUMAN' SO SEWANEE REVIEW LA English DT Fiction, Creative Prose RP FLEMING, B (reprint author), USN ACAD,ANNAPOLIS,MD 21402, USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU UNIV SOUTH PI SEWANEE PA SEWANEE REVIEW, SEWANEE, TN 37375 SN 0037-3052 J9 SEWANEE REV JI Sewanee Rev. PD SUM PY 1992 VL 100 IS 3 BP 410 EP 420 PG 11 WC Literary Reviews SC Literature GA JC971 UT WOS:A1992JC97100028 ER PT J AU SANDERS, JT AF SANDERS, JT TI IS STALINISM REALLY DEAD - TSIPKO,AS SO SLAVIC REVIEW LA English DT Book Review C1 HOOVER INST WAR REVOLUT & PEACE,STANFORD,CA 94305. RP SANDERS, JT (reprint author), USN ACAD,ANNAPOLIS,MD 21402, USA. NR 1 TC 0 Z9 0 U1 0 U2 0 PU AMER ASSOC ADVANCEMENT SLAVIC STUDIES PI STANFORD PA JORDAN QUAD/ACACIA, STANFORD UNIV, 125 PANAMA ST, STANFORD, CA 94305-4130 SN 0037-6779 J9 SLAVIC REV JI Slavic Rev. PD SUM PY 1992 VL 51 IS 2 BP 337 EP 338 DI 10.2307/2499538 PG 2 WC Area Studies; Humanities, Multidisciplinary SC Area Studies; Arts & Humanities - Other Topics GA JG716 UT WOS:A1992JG71600017 ER PT J AU WOODRUFF, SI CONWAY, TL AF WOODRUFF, SI CONWAY, TL TI IMPACT OF HEALTH AND FITNESS RELATED BEHAVIOR ON QUALITY-OF-LIFE SO SOCIAL INDICATORS RESEARCH LA English DT Article ID ILLNESS; POPULATION; DEPRESSION AB While the relationships between (a) health behavior and health status and (b) health status and perceived quality of life (QOL) have received some attention, the association between health behaviors and QOL has not been determined. The primary objective of this study was to assess the effects of health behaviors on QOL that are independent of the effects of health status. A sample of approximately 5 000 randomly selected U.S. Navy personnel was split into halves and analyses performed on each to establish the replicability of the findings. At step one of a multiple regression procedure, health status variables were forced into the equation; next, health behavior variables were entered. As expected, the block of health status variables was significantly related to QOL: self-assessed health and fitness status and lower reporting of physical symptoms accounted for 16% and 18% of the variance in QOL for the two subsamples. After controlling for health status, two behavioral measures made unique contributions to the prediction of QOL: behaviors related to avoiding unnecessary risks as a driver or pedestrain and avoiding or minimizing accidents. Wellness maintenance behaviors also were associated with QOL in one subsample. After controlling for health status, health behavior measures contributed an additional 11% and 6% of the explained variance in QOL for the two subsamples. Results indicate that health behaviors influence QOL independently of health status. RP WOODRUFF, SI (reprint author), USN,HLTH RES CTR,HLTH SERV RES DEPT,POB 85122,SAN DIEGO,CA 92186, USA. NR 33 TC 1 Z9 1 U1 1 U2 2 PU KLUWER ACADEMIC PUBL PI DORDRECHT PA SPUIBOULEVARD 50, PO BOX 17, 3300 AA DORDRECHT, NETHERLANDS SN 0303-8300 J9 SOC INDIC RES JI Soc. Indic. Res. PD JUN PY 1992 VL 26 IS 4 BP 391 EP 405 DI 10.1007/BF00347897 PG 15 WC Social Sciences, Interdisciplinary; Sociology SC Social Sciences - Other Topics; Sociology GA HY910 UT WOS:A1992HY91000004 ER PT J AU PAYNE, DM WARNER, JT LITTLE, RD AF PAYNE, DM WARNER, JT LITTLE, RD TI TIED MIGRATION AND RETURNS TO HUMAN-CAPITAL - THE CASE OF MILITARY WIVES SO SOCIAL SCIENCE QUARTERLY LA English DT Article AB The frequent rotation of military personnel provides a unique opportunity to study the consequences of tied migration on a group of women whose moves are anticipated and largely independent of economic forces. Possible consequences include reduced labor force participation and hours of work and lower returns to various forms of human capital investment. The analysis confirms these consequences and suggests that a three- versus six-year rotation policy reduces military wives' earnings by 40 percent. C1 CLEMSON UNIV,DEPT ECON,CLEMSON,SC 29634. USN ACAD,ANNAPOLIS,MD 21402. NR 19 TC 23 Z9 23 U1 0 U2 0 PU UNIV TEXAS PRESS PI AUSTIN PA BOX 7819, AUSTIN, TX 78713-7819 SN 0038-4941 J9 SOC SCI QUART JI Soc. Sci. Q. PD JUN PY 1992 VL 73 IS 2 BP 324 EP 339 PG 16 WC Social Sciences, Interdisciplinary SC Social Sciences - Other Topics GA JC975 UT WOS:A1992JC97500009 ER PT J AU SIERGEIJ, RR WHITE, MH SAKS, NS AF SIERGEIJ, RR WHITE, MH SAKS, NS TI THEORY AND MEASUREMENT OF QUANTIZATION EFFECTS ON SI-SIO2 INTERFACE TRAP MODELING SO SOLID-STATE ELECTRONICS LA English DT Article ID MOSFET; EXTRACTION; STATES AB In highly doped n-channel small geometry devices, the conduction band is quantized into discrete energy levels when the channel is inverted. In addition, the carriers are localized spatially, and the centroid of charge is a finite distance away from the Si-SiO2 interface. Thus, an electron in a filled interface trap will emit to the first allowed energy level, known as the ground state, which resides 50 meV above the surface conduction band energy level for doping densities of 10(17) atoms/cm3. Bulk potential bias will change the degree of quantization and must be included in a modified theory to correctly extract the emission times and capture cross section values for interface traps. We extend the Shockley-Read-Hall (SRH) theory to include two-dimensional surface quantization effects and formulate the statistics to account for localization of conduction band charge in both space and energy. The interface trap emission characteristics may be obtained with an electrical measurement, called the tri-level charge pumping technique, which offers a convenient method to study emission from interface traps to quantized conduction band states. Measurement techniques of quasi-static C-V, high frequency C-V, drain current, and charge pumping are used to characterize the interface. Tri-level charge pumping measurements on large (100 x 10-mu-m), highly doped MOSFETs provide experimental evidence of two-dimensional effects, and extracted electron capture cross sections are found to be an order of magnitude larger than values from classical theory. C1 USN,RES LABS,WASHINGTON,DC 20375. RP SIERGEIJ, RR (reprint author), LEHIGH UNIV,SHERMAN FAIRCHILD CTR SOLID STATE STUDIES,BETHLEHEM,PA 18015, USA. NR 19 TC 30 Z9 30 U1 0 U2 5 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0038-1101 J9 SOLID STATE ELECTRON JI Solid-State Electron. PD JUN PY 1992 VL 35 IS 6 BP 843 EP 854 DI 10.1016/0038-1101(92)90287-M PG 12 WC Engineering, Electrical & Electronic; Physics, Applied; Physics, Condensed Matter SC Engineering; Physics GA HW654 UT WOS:A1992HW65400013 ER PT J AU CLARIDGE, L AF CLARIDGE, L TI BYRON AND THE LIMITS OF FICTION - BEATTY,B, NEWEY,V SO STUDIES IN ROMANTICISM LA English DT Book Review RP CLARIDGE, L (reprint author), USN ACAD,ANNAPOLIS,MD 21402, USA. NR 1 TC 0 Z9 0 U1 0 U2 0 PU BOSTON UNIV SCHOLARLY PUBL PI BOSTON PA 985 COMMONWEALTH AVE, BOSTON, MA 02215 SN 0039-3762 J9 STUD ROMANTICISM JI Stud. Romant. PD SUM PY 1992 VL 31 IS 2 BP 268 EP 272 DI 10.2307/25600957 PG 5 WC Literature SC Literature GA JV345 UT WOS:A1992JV34500011 ER PT J AU BARKER, EH AF BARKER, EH TI DESIGN OF THE NAVY MULTIVARIATE OPTIMUM INTERPOLATION ANALYSIS SYSTEM SO WEATHER AND FORECASTING LA English DT Article AB The aspects of the navy's multivariate optimum interpolation (MVOI) for atmospheric analysis are presented. Included is an overview of how the MVOI is used in the navy's data-assimilation system, and the basic design of the MVOI. The specific features described include: a cursory presentation of the optimization method and some of its deficiencies, the application of the volume method in data selection and program design, the structure models used to represent the prediction errors, and the quality control checks applied to the observations. Validation experiments that illustrate some of the features of the navy's analysis system are presented. Experiments showing the exactness of the geostrophic constraint, the effect of correlated observation error, the advantage of the geostrophic constraint, and the impact of satellite temperatures on the analysis are presented. These experiments were necessary to catch minor design and programming errors in the analysis system that are too small to be detected through casual inspection, yet which degrade the quality of the analysis. It has been shown that implementation of the volume method has given more precise geostrophic coupling over the gridpoint method, and that inputting satellite temperatures as pressure thicknesses rather than pressure-level heights produces results that agree with the satellite-derived layer thickness values, while it ties the analysis to observations of pressure heights. Finally, the validation experiments were shown to be highly effective at removing subtle errors in the analysis system, which led to rapid implementation and an extended error-free operational lifetime. RP BARKER, EH (reprint author), USN,OCEANOG & ATMOSPHER RES LAB,ATMOSPHER DIRECTORATE,MONTEREY,CA 93943, USA. NR 0 TC 49 Z9 49 U1 0 U2 0 PU AMER METEOROLOGICAL SOC PI BOSTON PA 45 BEACON ST, BOSTON, MA 02108-3693 SN 0882-8156 J9 WEATHER FORECAST JI Weather Forecast. PD JUN PY 1992 VL 7 IS 2 BP 220 EP 231 DI 10.1175/1520-0434(1992)007<0220:DOTNMO>2.0.CO;2 PG 12 WC Meteorology & Atmospheric Sciences SC Meteorology & Atmospheric Sciences GA HZ397 UT WOS:A1992HZ39700003 ER PT J AU GOERSS, JS PHOEBUS, PA AF GOERSS, JS PHOEBUS, PA TI THE NAVY OPERATIONAL ATMOSPHERIC ANALYSIS SO WEATHER AND FORECASTING LA English DT Article AB In January of 1988, significant upgrades were made to the Navy Operational Global Atmospheric Prediction System (NOGAPS). Among these improvements was the implementation of a multivariate optimum interpolation analysis scheme. Since that time, this analysis scheme has been improved and expanded to satisfy almost all of the navy's atmospheric analysis requirements. In this paper, we describe the global database available for analysis, the techniques currently used to produce the NOGAPS analyzed fields, and the modifications required for other applications. RP GOERSS, JS (reprint author), USN,RES LAB,MONTEREY,CA 93943, USA. NR 0 TC 44 Z9 45 U1 0 U2 0 PU AMER METEOROLOGICAL SOC PI BOSTON PA 45 BEACON ST, BOSTON, MA 02108-3693 SN 0882-8156 J9 WEATHER FORECAST JI Weather Forecast. PD JUN PY 1992 VL 7 IS 2 BP 232 EP 249 DI 10.1175/1520-0434(1992)007<0232:TNOAA>2.0.CO;2 PG 18 WC Meteorology & Atmospheric Sciences SC Meteorology & Atmospheric Sciences GA HZ397 UT WOS:A1992HZ39700004 ER PT J AU BAKER, NL AF BAKER, NL TI QUALITY-CONTROL FOR THE NAVY OPERATIONAL ATMOSPHERIC DATABASE SO WEATHER AND FORECASTING LA English DT Article AB A new, operational meteorological database has been developed to provide quality-controlled observations for the atmospheric analysis and prediction systems at Fleet Numerical Oceanography Center (FNOC). The quality control procedures for the database were developed by Atmospheric Directorate of the Naval Oceanographic and Atmospheric Research Laboratory (now the Naval Research Laboratory), which is collocated with FNOC in Monterey, California. Global observations of atmospheric variables are subjected to various quality control techniques before being added to this database. During preliminary data processing, all observations are checked against gross-error limits, multilevel reports are checked for vertical consistency, and multivariable reports are checked for internal consistency. Subsequent quality tests are performed in the analysis to ensure consistency between the observed data and the analysis background and to verify that the observations are supported by the surrounding reports. Additionally, several options are available for subjective intervention, including the creation of synthetic marine observations or the deletion of ship reports. Finally, efforts are being made to use archived quality statistics to determine bias corrections and quality estimates for radiosonde stations. RP BAKER, NL (reprint author), USN,RES LAB,MONTEREY,CA 93943, USA. NR 0 TC 36 Z9 36 U1 1 U2 2 PU AMER METEOROLOGICAL SOC PI BOSTON PA 45 BEACON ST, BOSTON, MA 02108-3693 SN 0882-8156 J9 WEATHER FORECAST JI Weather Forecast. PD JUN PY 1992 VL 7 IS 2 BP 250 EP 261 DI 10.1175/1520-0434(1992)007<0250:QCFTNO>2.0.CO;2 PG 12 WC Meteorology & Atmospheric Sciences SC Meteorology & Atmospheric Sciences GA HZ397 UT WOS:A1992HZ39700005 ER PT J AU ROSMOND, TE AF ROSMOND, TE TI THE DESIGN AND TESTING OF THE NAVY OPERATIONAL GLOBAL ATMOSPHERIC PREDICTION SYSTEM SO WEATHER AND FORECASTING LA English DT Article AB The Navy Operational Global Atmospheric Prediction System (NOGAPS) has proven itself to be competitive with any of the large forecast models run by the large operational forecast centers around the world. The navy depends on NOGAPS for an astonishingly wide range of applications, from ballistic winds in the stratosphere to air-sea fluxes to drive ocean general circulation models. Users of these applications will benefit from a better understanding of how a system such as NOGAPS is developed, what physical assumptions and compromises have been made, and what they can reasonably expect in the future as the system continues to evolve. The discussions will be equally relevant for users of products from other large forecast centers, e.g., National Meteorological Center, European Centre for Medium-Range Weather Forecasts. There is little difference in the scientific basis of the models and the development methodologies used for their development. However, the operational priorities of each center and their computer hardware and software environments often dictate what compromises are made and how model-based research is conducted. In this paper, NOGAPS will serve as the basis for discussing these issues and the art of numerical weather prediction model development. RP ROSMOND, TE (reprint author), USN,OCEANOG & ATMOSPHER RES LAB,ATMOSPHER DIRECTORATE,MONTEREY,CA 93943, USA. NR 0 TC 75 Z9 76 U1 0 U2 1 PU AMER METEOROLOGICAL SOC PI BOSTON PA 45 BEACON ST, BOSTON, MA 02108-3693 SN 0882-8156 J9 WEATHER FORECAST JI Weather Forecast. PD JUN PY 1992 VL 7 IS 2 BP 262 EP 272 DI 10.1175/1520-0434(1992)007<0262:TDATOT>2.0.CO;2 PG 11 WC Meteorology & Atmospheric Sciences SC Meteorology & Atmospheric Sciences GA HZ397 UT WOS:A1992HZ39700006 ER PT J AU PHILLIPS, RH METZBOWER, EA AF PHILLIPS, RH METZBOWER, EA TI LASER-BEAM WELDING OF HY80 AND HY100 STEELS USING HOT WELDING WIRE ADDITION SO WELDING JOURNAL LA English DT Article DE FEED SPEED; HARDNESS TESTING; HOT WELDING WIRE; HOT WIRE ADDITIONS; HY80; HY100; LASER BEAM WELDING; METALLOGRAPHY; MICROSTRUCTURE; STEEL PLATE AB Laser beam welds incorporating a hot welding wire filler metal addition technique have been successfully produced in HY80 and HY100 steels. Plate thicknesses of 13 and 26 mm were welded by this technique in these experiments. This evaluation included radiographic and metallographic examinations, hardness traverses, Charpy V-notch tests over the temperature range -68-degrees to 20-degrees-C and fractographic examinations. Hardness traverses across the hot wire addition welds showed a significant reduction in weld metal hardness compared to the autogenous welds. The reduction in hardness was greater for the "fast" wire addition welds compared to the "slow" wire addition welds. The hot wire feed speed also had a concomitant effect on weld metal microstructure. The slow wire feed speed resulted in a mixed martensite-bainite microstructure, whereas fast wire feed speed produced an acicular ferrite microstructure. Charpy tests showed that hot wire addition significantly improved weldment toughness compared to autogenous welds at the plate sulfur level investigated (0.012 wt %) for both HY80 and HY100 steels. Toughness was further improved using a fast wire feed compared to a slow wire feed. C1 USN,RES LAB,WASHINGTON,DC 20375. RP PHILLIPS, RH (reprint author), MAT RES LABS,MELBOURNE,AUSTRALIA. NR 9 TC 4 Z9 6 U1 2 U2 7 PU AMER WELDING SOC PI MIAMI PA PO BOX 351040, MIAMI, FL 33135 SN 0043-2296 J9 WELD J JI Weld. J. PD JUN PY 1992 VL 71 IS 6 BP S201 EP S208 PG 8 WC Metallurgy & Metallurgical Engineering SC Metallurgy & Metallurgical Engineering GA HW985 UT WOS:A1992HW98500013 ER PT J AU PAO, PS GILL, SJ FENG, CR MICHEL, DJ AF PAO, PS GILL, SJ FENG, CR MICHEL, DJ TI FATIGUE AND FRACTURE OF A NI2CR ORDERED INTERMETALLIC ALLOY SO MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING LA English DT Article ID HYDROGEN EMBRITTLEMENT AB The influences of atomic ordering and environment on the fatigue crack growth resistance of Ni2Cr were investigated. It was found that fatigue crack growth resistance increases with the degree of order. The nearly ordered Ni2Cr (degree of order, S = 0.9) exhibited the lowest fatigue crack growth rate and the highest fatigue crack growth threshold in air and in a 3.5% NaCl solution, while the disordered Ni2Cr had the highest rates and the lowest threshold. Disordered, partially ordered (S = 0.5), and nearly ordered Ni2Cr all exhibited higher fatigue crack growth rates and lower thresholds in a 3.5% NaCl solution than in air. The disordered and nearly ordered Ni2Cr, however, exhibited more environmental cracking susceptibility than the partially ordered alloy. The observed fatigue crack growth kinetics and fracture surface morphology are discussed in terms of the underlying microstructural features, deformation mechanisms and hydrogen partitioning processes. RP PAO, PS (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 5 TC 3 Z9 3 U1 0 U2 0 PU ELSEVIER SCIENCE SA LAUSANNE PI LAUSANNE 1 PA PO BOX 564, 1001 LAUSANNE 1, SWITZERLAND SN 0921-5093 J9 MAT SCI ENG A-STRUCT JI Mater. Sci. Eng. A-Struct. Mater. Prop. Microstruct. Process. PD MAY 30 PY 1992 VL 153 IS 1-2 BP 532 EP 537 DI 10.1016/0921-5093(92)90248-Y PG 6 WC Nanoscience & Nanotechnology; Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Science & Technology - Other Topics; Materials Science; Metallurgy & Metallurgical Engineering GA JC007 UT WOS:A1992JC00700029 ER PT J AU PREGGER, BA KIRCHER, T KHAN, A AF PREGGER, BA KIRCHER, T KHAN, A TI OXIDATION BEHAVIOR OF A NIAL/TIB2 INTERMETALLIC COMPOSITE SO MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING LA English DT Article ID FE-CR-AL; O-18 TRACER; ALLOYS; GROWTH; MICROSTRUCTURE; SCALES; ALPHA-AL2O3; MECHANISM; ADHERENCE; ADHESION AB Isothermal oxidation of a NiAl/TiB2 composite material has been investigated. Samples of NiAl with 0, 10 and 20 vol.% TiB2 particulates were oxidized at 1000, 1100 and 1200-degrees-C for 48 h. Thermogravimetric analysis was used to quantify oxide growth kinetics. Scanning electron microscopy with energy dispersive X-ray spectrometry was used along with X-ray diffraction to identify oxidation products and characterize oxide scale morphology. Oxidation was observed to follow parabolic kinetics. Rate of oxidation increased with TiB2 content. The oxide that developed on the composite material formed an alumina scale that was not entirely protective. The development of microscopic channels allowed oxygen penetration below the alumina, resulting in subscale oxidation. Crystallites of TiO2 formed on the surface, increasing in size with oxidation temperature. Void formation between scale and substrate was much more extensive for the composite than for NiAl. Microstructural evidence indicates that TiB2 dissociates within the void regions leading to outward diffusion of titanium through the oxide scale and formation of TiO2 at the outer surface, while the Al2O3 scale forms at the metal-oxide interface. RP PREGGER, BA (reprint author), USN,CTR AIR DEV,ADV MET & CERAM MAT BRANCH,CODE 6063,WARMINSTER,PA 18974, USA. NR 21 TC 13 Z9 13 U1 0 U2 1 PU ELSEVIER SCIENCE SA LAUSANNE PI LAUSANNE 1 PA PO BOX 564, 1001 LAUSANNE 1, SWITZERLAND SN 0921-5093 J9 MAT SCI ENG A-STRUCT JI Mater. Sci. Eng. A-Struct. Mater. Prop. Microstruct. Process. PD MAY 30 PY 1992 VL 153 IS 1-2 BP 567 EP 572 DI 10.1016/0921-5093(92)90252-V PG 6 WC Nanoscience & Nanotechnology; Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Science & Technology - Other Topics; Materials Science; Metallurgy & Metallurgical Engineering GA JC007 UT WOS:A1992JC00700033 ER PT J AU FITZGERALD, JP HAGGERTY, BS RHEINGOLD, AL MAY, L BREWER, GA AF FITZGERALD, JP HAGGERTY, BS RHEINGOLD, AL MAY, L BREWER, GA TI IRON OCTAETHYLTETRAAZAPORPHYRINS - SYNTHESIS, CHARACTERIZATION, COORDINATION CHEMISTRY, AND COMPARISONS TO RELATED IRON PORPHYRINS AND PHTHALOCYANINES SO INORGANIC CHEMISTRY LA English DT Article ID SPIN-STATE; MAGNETIC-SUSCEPTIBILITY; MOLECULAR-STRUCTURE; ORGANIC-SOLVENTS; COMPLEXES; MOSSBAUER; IRON(III); CRYSTAL; TETRAPHENYLPORPHYRIN; STEREOCHEMISTRY AB This paper describes the synthesis and characterization of a series of iron octaethyltetraazaporphyrin complexes and a comparison of these substances to related iron porphyrins and phthalocyanines. Experimental evidence provided by magnetic susceptibility measurements, H-1 NMR, EPR, and Mossbauer spectroscopies, cyclic voltammetry, and/or X-ray crystallography indicates the tetraazaporphyrin ligand is a stronger sigma-donor and pi-acceptor than is a porphyrin ligand. Due to its high sigma-basicity, the tetraazaporphyrin ligand stabilizes the unusual S = 3/2 spin state for iron in chloroiron(III) octaethyltetraazaporphyrin. Yet the high pi-acidity of the tetraazaporphyrin ligand shifts iron III/II redox potentials 400 mV positive of those for analogous iron porphyrins. In this sense, the tetraazaporphyrin macrocycle is more like a phthalocyanine than a porphyrin. Compared to phthalocyanines octaethyltetraazaporphyrins are readily soluble. The high solubility, unusual metal spin states, and positively shifted redox potentials of octaethyltetraazaporphyrins suggest that they may have better or unique catalytic properties than porphyrins or phthalocyanines. C1 UNIV DELAWARE,DEPT CHEM & BIOCHEM,NEWARK,DE 19716. CATHOLIC UNIV AMER,DEPT CHEM,WASHINGTON,DC 20064. RP FITZGERALD, JP (reprint author), USN ACAD,DEPT CHEM,ANNAPOLIS,MD 21402, USA. NR 64 TC 121 Z9 122 U1 3 U2 24 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0020-1669 J9 INORG CHEM JI Inorg. Chem. PD MAY 27 PY 1992 VL 31 IS 11 BP 2006 EP 2013 DI 10.1021/ic00037a007 PG 8 WC Chemistry, Inorganic & Nuclear SC Chemistry GA HW916 UT WOS:A1992HW91600007 ER PT J AU TOMLIN, DW ROLAND, CM AF TOMLIN, DW ROLAND, CM TI NEGATIVE EXCESS ENTHALPY IN A VANDERWAALS POLYMER MIXTURE SO MACROMOLECULES LA English DT Note ID ANGLE NEUTRON-SCATTERING; AMORPHOUS BINARY-MIXTURES; INTEGRAL-EQUATION THEORY; NORMAL 1,4-POLYBUTADIENES; POLYVINYL METHYL-ETHER); PHASE-BEHAVIOR; BLENDS; THERMODYNAMICS; MISCIBILITY; POLYSTYRENE C1 USN,RES LAB,DIV CHEM,CODE 6120,WASHINGTON,DC 20375. NR 45 TC 59 Z9 59 U1 1 U2 5 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0024-9297 J9 MACROMOLECULES JI Macromolecules PD MAY 25 PY 1992 VL 25 IS 11 BP 2994 EP 2996 DI 10.1021/ma00037a033 PG 3 WC Polymer Science SC Polymer Science GA HX033 UT WOS:A1992HX03300033 ER PT J AU GUEDRY, FE AF GUEDRY, FE TI PERCEPTION OF MOTION AND POSITION RELATIVE TO THE EARTH - AN OVERVIEW SO ANNALS OF THE NEW YORK ACADEMY OF SCIENCES LA English DT Article ID OCULOMOTOR C1 UNIV W FLORIDA,PENSACOLA,FL 32514. RP GUEDRY, FE (reprint author), USN,AEROSP MED RES LAB,NAVAL AIR STN,PENSACOLA,FL 32508, USA. NR 22 TC 21 Z9 21 U1 1 U2 4 PU NEW YORK ACAD SCIENCES PI NEW YORK PA 2 E 63RD ST, NEW YORK, NY 10021 SN 0077-8923 J9 ANN NY ACAD SCI JI Ann. N.Y. Acad. Sci. PD MAY 22 PY 1992 VL 656 BP 315 EP 328 DI 10.1111/j.1749-6632.1992.tb25218.x PG 14 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA JM221 UT WOS:A1992JM22100023 PM 1599152 ER PT J AU BAUM, K NGUYEN, NV GILARDI, R FLIPPENANDERSON, JL GEORGE, C AF BAUM, K NGUYEN, NV GILARDI, R FLIPPENANDERSON, JL GEORGE, C TI NITRATION OF 1,1-DIAMINO-2,2-DINITROETHYLENES SO JOURNAL OF ORGANIC CHEMISTRY LA English DT Article ID NITRO AB The nitration of 1,1-diamino-2,2-dinitroethylenes, obtained by the reaction of amines with 1,1-diiododinitroethylene, was studied. Reaction of 2-(dinitromethylene)-1,3-diazacyclopentane (la) with nitric acid and trifluoroacetic anhydride in methylene chloride gave 3-nitro-2-(trinitromethyl)-1,3-diazacyclopent-1-ene (3a) in high yield. Analogous products 3b-3d were obtained from 2-(dinitromethylene)-1,3-diazacyclohexane (1b), 2-(dinitromethylene)-1,3-diazacycloheptane (1c), and 3,9-bis(dinitromethylene)-2,4,8,10-tetraazaspiro[5.5]undecane (1d). Nitration of 1a with nitric acid in sulfuric acid gave the corresponding nitrosamine 2a. Reductive denitrations of the trinitromethyl compounds 3a, 3b, and 3c with potassium iodide gave salts of the corresponding dinitromethyl compounds 4a, 4b, and 4c. Bromination and chlorination of 4a afforded 2-(bromodinitromethyl)-3-nitro-1,3-diazacyclopentent-1-ene (5) and 2-(chlorodinitromethyl)-3-nitro-1,3-diazacyclopent-1-ene (6), respectively. Acidification of the salts 4a, 4b, and 4c gave 2-(dinitromethylene)-1-nitro-1,3-diazacyclopentane (7a), 2-(dinitromethylene)-1-nitro-1,3-diazacyclohexane (7b), and 2-(dinitromethylene)-1-nitro-1,3-diazacycloheptane (7c), respectively. The nitration of 7a gave 3a. Nitrations of the diamino mononitro olefins, 2-(nitromethylene)-1, 3-diazacyclopentane (8a) and 2-(nitromethylene)-1,3-diazacyclohexane (8b), gave 3a and 3b. The structures of 3a, 3d, 7a, 7b, and 7c were obtained by X-ray crystallography. Olefin twist angles for 7a-7c, as high as 74.5-degrees, are rationalized on the bases of ring geometry and hydrogen bonding. C1 USN,RES LAB,STRUCT MATTER LAB,WASHINGTON,DC 20375. RP BAUM, K (reprint author), FLUOROCHEM INC,AZUSA,CA 91702, USA. NR 22 TC 22 Z9 23 U1 0 U2 7 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0022-3263 J9 J ORG CHEM JI J. Org. Chem. PD MAY 22 PY 1992 VL 57 IS 11 BP 3026 EP 3030 DI 10.1021/jo00037a015 PG 5 WC Chemistry, Organic SC Chemistry GA HW180 UT WOS:A1992HW18000015 ER PT J AU CARTAGENA, EN OFFORD, B GARCIA, G AF CARTAGENA, EN OFFORD, B GARCIA, G TI BIPOLAR JUNCTION TRANSISTORS FABRICATED IN SILICON-ON-SAPPHIRE SO ELECTRONICS LETTERS LA English DT Article DE BIPOLAR DEVICES; TRANSISTORS; SEMICONDUCTOR DEVICES AND MATERIALS AB The effects of processing temperature on collector leakage current in bipolar junction transistors (BJTs) fabricated in silicon-on-sapphire (SOS) were examined. At low process temperatures (850-degrees-C) a reduction of five orders of magnitude in the collector leakage current was observed. Excellent I-V characteristics were obtained on both NPN and PNP transistors fabricated at lower temperatures. Measured DC current gain-beta for the NPN devices was 30, and that of the PNP devices was 40. Additionally, current mode logic (CML) circuits fabricated using these transistors exhibited well behaved DC switching characteristics. RP CARTAGENA, EN (reprint author), USN,CTR COMMAND CONTROL OCEAN SURVEILLANCE,DIV RES DEV TEST & EVALUAT,SAN DIEGO,CA 92152, USA. NR 8 TC 0 Z9 0 U1 0 U2 0 PU IEE-INST ELEC ENG PI HERTFORD PA MICHAEL FARADAY HOUSE SIX HILLS WAY STEVENAGE, HERTFORD, ENGLAND SG1 2AY SN 0013-5194 J9 ELECTRON LETT JI Electron. Lett. PD MAY 21 PY 1992 VL 28 IS 11 BP 983 EP 985 DI 10.1049/el:19920625 PG 3 WC Engineering, Electrical & Electronic SC Engineering GA HW541 UT WOS:A1992HW54100008 ER PT J AU HARRISON, JA WHITE, CT COLTON, RJ BRENNER, DW AF HARRISON, JA WHITE, CT COLTON, RJ BRENNER, DW TI NANOSCALE INVESTIGATION OF INDENTATION, ADHESION AND FRACTURE OF DIAMOND (111) SURFACES SO SURFACE SCIENCE LA English DT Article ID ATOMIC-FORCE MICROSCOPE; SCALE FRICTION; TUNGSTEN TIP; FILMS; MONOLAYER AB Molecular dynamics simulations have been used to model the dynamics of indentation and the resulting damage for a (111) surface of a (1x1) hydrogen terminated diamond tip interacting with the (111) surface of both a (1x1) hydrogen terminated diamond crystal and a non-hydrogen terminated diamond crystal. In both cases, indentation can result in a non-adhesive (i.e., elastic) or an adhesive (i.e., plastic) interaction depending on the maximum value of the applied load. Further, adhesion is usually accompanied by fracture and is independent of where the tip contacts the surface. In the case of the hydrogen terminated crystal, the diamond crystal structure is significantly disrupted as a result of the indentation. When the hydrogen is removed from the crystal's surface, adhesion occurs at lower loads than previously observed. However, the crystal structure is not significantly altered as a result of the indentation. The state of the surface dictates the type of indentation mechanism. RP HARRISON, JA (reprint author), USN,RES LAB,DIV CHEM,CODE 6170,WASHINGTON,DC 20375, USA. RI Brenner, Donald/D-1741-2009 NR 28 TC 81 Z9 83 U1 2 U2 13 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0039-6028 J9 SURF SCI JI Surf. Sci. PD MAY 21 PY 1992 VL 271 IS 1-2 BP 57 EP 67 DI 10.1016/0039-6028(92)90861-Y PG 11 WC Chemistry, Physical; Physics, Condensed Matter SC Chemistry; Physics GA HY363 UT WOS:A1992HY36300008 ER PT J AU TURNER, BE XU, LP RICKARD, LJ AF TURNER, BE XU, LP RICKARD, LJ TI ON THE NATURE OF THE MOLECULAR CORES IN HIGH-LATITUDE CIRRUS CLOUDS .2. STRUCTURE, STABILITY, AND PHYSICAL CONDITIONS FROM (CO)-O-18 OBSERVATIONS SO ASTROPHYSICAL JOURNAL LA English DT Article DE ISM, CLOUDS; ISM, MOLECULES ID DENSE INTERSTELLAR CLOUDS; HIGH GALACTIC LATITUDES; STAR FORMATION; NONHOMOLOGOUS CONTRACTION; INTERCLOUD MEDIUM; CHEMISTRY; GAS; CO; EQUILIBRIA; MODELS AB Extensive observations of the J = 2-1 and 1-0 lines of (CO)-O-18, (CO)-C-13, and (CO)-C-12 have been made of 33 high-latitude cirrus cloud cores and two high-latitude, cold, dense molecular clouds. It is argued that (CO)-O-18 is an essential observational tool for the understanding of molecular cloud structure. We have developed the formalism of molecular clouds both in polytropic hydrostatic equilibrium and also undergoing self-similar dynamical collapse, and we apply these to our (CO)-O-18 observations. Six of the 15 objects with suitable (CO)-O-18 observations are found to be consistent with hydrostatic equilibrium models. These and an additional four objects may be explained by the dynamical collapse models, and the remaining three objects (including the two cold, dense clouds) cannot be explained by either type of model. Most of the analysis involves the region around the central line of sight, but analysis of strip maps of (CO)-O-18 confirm these conclusions. The relation between the observed chemistry and the dynamical state of the cloud (equilibrium or collapsing) is discussed, as is the possible nature of the (cold dense) clouds that cannot currently be explained by these models. C1 BEIJING UNIV, DEPT GEOPHYS, BEIJING 100871, PEOPLES R CHINA. USN, RES LAB, EO HULBURT CTR SPACE RES, WASHINGTON, DC 20375 USA. RP TURNER, BE (reprint author), NATL RADIO ASTRON OBSERV, 520 EDGEMONT RD, CHARLOTTESVILLE, VA 22903 USA. NR 69 TC 45 Z9 45 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 MAY 20 PY 1992 VL 391 IS 1 BP 158 EP 187 DI 10.1086/171334 PN 1 PG 30 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA HT591 UT WOS:A1992HT59100014 ER PT J AU DOYLE, JG COOK, JW AF DOYLE, JG COOK, JW TI THE SUN AS A STAR - HIGH SPECTRAL RESOLUTION SOLAR DATA DEGRADED TO LOW-DISPERSION IUE RESOLUTION SO ASTROPHYSICAL JOURNAL LA English DT Article DE SUN, FLARES; SUN, UV RADIATION; ULTRAVIOLET, STARS AB We present high spectral resolution (approximately 0.06 angstrom) solar data for an active region and a large two-ribbon flare degraded to the typical resolution of low-dispersion (approximately 5 angstrom) spectra of the International Ultraviolet Explorer (IUE) satellite. This clearly shows the amount of detail yet to bc acquired in stellar spectra and indicates the main spectral regions where line blending is a problem. C1 USN,RES LAB,EO HULBURT CTR SPACE RES,WASHINGTON,DC 20375. RP DOYLE, JG (reprint author), ARMAGH OBSERV,ARMAGH BT61 9DG,NORTH IRELAND. NR 10 TC 7 Z9 7 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 MAY 20 PY 1992 VL 391 IS 1 BP 393 EP 402 DI 10.1086/171354 PN 1 PG 10 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA HT591 UT WOS:A1992HT59100034 ER PT J AU BHATIA, SK HICKMAN, JJ LIGLER, FS AF BHATIA, SK HICKMAN, JJ LIGLER, FS TI NEW APPROACH TO PRODUCING PATTERNED BIOMOLECULAR ASSEMBLIES SO JOURNAL OF THE AMERICAN CHEMICAL SOCIETY LA English DT Note ID SURFACES C1 USN,RES LAB,CTR BIOMOLEC SCI & ENGN,CODE 6090,WASHINGTON,DC 20375. GEOCENTERS INC,FT WASHINGTON,MD 20744. SCI APPLICAT INT CORP,MCLEAN,VA 22102. NR 19 TC 114 Z9 117 U1 1 U2 6 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0002-7863 J9 J AM CHEM SOC JI J. Am. Chem. Soc. PD MAY 20 PY 1992 VL 114 IS 11 BP 4432 EP 4433 DI 10.1021/ja00037a077 PG 2 WC Chemistry, Multidisciplinary SC Chemistry GA HV675 UT WOS:A1992HV67500077 ER PT J AU THORNHILL, JW APRUZESE, JP DAVIS, J CLARK, RW AF THORNHILL, JW APRUZESE, JP DAVIS, J CLARK, RW TI DESIGN CONSIDERATIONS FOR Z-PINCH DRIVEN PHOTORESONANT X-RAY LASING IN NEON-LIKE KRYPTON SO JOURNAL OF APPLIED PHYSICS LA English DT Article ID DIELECTRONIC RECOMBINATION; ISOELECTRONIC SEQUENCE; LASER; RADIATION; IONS; COEFFICIENTS; ULTRAVIOLET; EXCITATION; SELENIUM; PLASMAS AB A neonlike x-ray laser photoresonant pumping scheme is explored. An attractive design is a coaxial z-pinch consisting of an inner krypton lasant plasma surrounded by a carbon shell that itself is surrounded by a stagnated krypton plasma. The photoresonant radiation emitted from the outer plasma passes inwardly through the carbon shell and photoexcites lasant electrons to the 3s, 3d, and 4d levels. It is calculated that monochromatic pump powers of 30 GW/cm eV can be achieved for the 4d neonlike resonance line while powers of 100-200 GW/cm eV are attainable for the 3s and 3d resonance lines. The gain in several neonlike 3s-3p transitions is calculated as a function of temperature and density of the lasant plasma. Reasonable gain in only the 3p-3s (J = 0-1) transition is obtained for high-density, high-temperature lasant conditions. This gain, which is driven by monopole excitation from the ground state to the 3p (J = 0) level, is nearly independent of the presence of pump radiation. For low-density, low-temperature lasants, optimal gain is obtained in the 3p-3s (J = 2-1) transitions. Under these conditions, the pump radiation is necessary to photoionize and photoexcite the lasant plasma to the neonlike stage while radiative decay from the resonantly pumped 4d level to the 3p (J = 2) states provides the major upper lasing level pump mechanism. RP THORNHILL, JW (reprint author), USN,RES LAB,DIV PLASMA PHYS,RADIAT HYDRODYNAM BRANCH,WASHINGTON,DC 20375, USA. NR 24 TC 1 Z9 1 U1 0 U2 0 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0021-8979 J9 J APPL PHYS JI J. Appl. Phys. PD MAY 15 PY 1992 VL 71 IS 10 BP 4671 EP 4677 DI 10.1063/1.350657 PG 7 WC Physics, Applied SC Physics GA HV471 UT WOS:A1992HV47100004 ER PT J AU CAROSELLA, CA CHRISEY, DB LUBITZ, P HORWITZ, JS DORSEY, P SEED, R VITTORIA, C AF CAROSELLA, CA CHRISEY, DB LUBITZ, P HORWITZ, JS DORSEY, P SEED, R VITTORIA, C TI PULSED LASER DEPOSITION OF EPITAXIAL BAFE12O19 THIN-FILMS SO JOURNAL OF APPLIED PHYSICS LA English DT Article ID BARIUM FERRITE; RESONANCE; GROWTH AB Epitaxial thin films of barium hexaferrite (BaFe12O19) have been fabricated by the pulsed laser deposition technique on basal plane sapphire. Structural studies reveal the films to be predominantly single phase and crystalline, with the c axis oriented perpendicular to the film plane. The magnetic parameters deduced from vibrating sample magnetometer and ferromagnetic resonance (FMR) measurements are close to the parameters associated with bulk materials. Post annealing of the films reduced the FMR linewidth by more than a factor of 3 so that it compares reasonably well with single-crystal films. The derivative FMR linewidth was measured to be 66 Oe at 58 GHz and 54 Oe at 86 GHz. Spin-wave-like modes have been observed for the first time in barium ferrite films. The deduced exchange stiffness constant of 0.5 x 10(-6) ergs/cm is in reasonable agreement with recent calculations. C1 NORTHEASTERN UNIV,BOSTON,MA 02115. RP CAROSELLA, CA (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 16 TC 84 Z9 84 U1 1 U2 21 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0021-8979 J9 J APPL PHYS JI J. Appl. Phys. PD MAY 15 PY 1992 VL 71 IS 10 BP 5107 EP 5110 DI 10.1063/1.350614 PG 4 WC Physics, Applied SC Physics GA HV471 UT WOS:A1992HV47100067 ER PT J AU BOURKE, RH PAQUETTE, RG BLYTHE, RF AF BOURKE, RH PAQUETTE, RG BLYTHE, RF TI THE JAN-MAYEN CURRENT OF THE GREENLAND SEA SO JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS LA English DT Article ID WATER AB Oceanographic measurements acquired by the USNS Bartlett during September 1989 in and north of the area of the Jan Mayen Current (JMC) show that, in terms of upper layer baroclinic flow, about half of the JMC is a wide meander in the East Greenland Current (EGC) and about half continues eastward to close the Greenland Gyre (GG) on the south. This phenomenon has been charted in the past but has elicited no comment. Surface drifters and a numerical model corroborate this behavior. At deeper depths (> 100 m) the meander dissipates with the flow becoming more easterly. A drifting float at 500 m depth confirms that the flow is relatively undeviated toward the east ultimately merging with the northward flowing Norwegian Atlantic Current. Near the GG the fresh water content of the water column is low in the upper layers but high in the middepths. Where there is a substantial content of EGC water (e.g., in the JMC), the converse is usually true. The FWC of the GG computed for the period 1953-1966 was smaller by a factor of 2 in both layers than in 1989, indicating that 1989 is in another period of low salinity comparable to that of 1968, the period of the Great Salinity Anomaly described by Dickson et al. (1988). RP BOURKE, RH (reprint author), USN,POSTGRAD SCH,DEPT OCEANOG,MONTEREY,CA 93943, USA. NR 17 TC 24 Z9 24 U1 0 U2 1 PU AMER GEOPHYSICAL UNION PI WASHINGTON PA 2000 FLORIDA AVE NW, WASHINGTON, DC 20009 SN 0148-0227 J9 J GEOPHYS RES-OCEANS JI J. Geophys. Res.-Oceans PD MAY 15 PY 1992 VL 97 IS C5 BP 7241 EP 7250 DI 10.1029/92JC00150 PG 10 WC Oceanography SC Oceanography GA HU911 UT WOS:A1992HU91100002 ER PT J AU SCHMITZ, WJ THOMPSON, JD LUYTEN, JR AF SCHMITZ, WJ THOMPSON, JD LUYTEN, JR TI THE SVERDRUP CIRCULATION FOR THE ATLANTIC ALONG 24-DEGREES-N SO JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS LA English DT Article ID TROPICAL NORTH-ATLANTIC; ABACO-ISLAND; WORLD OCEAN; WIND STRESS; BAHAMAS; TRANSPORT; EAST; HEAT; 26.5-DEGREES-N; VARIABILITY AB The 30 Sv transported by the Florida Current through the Straits of Florida off Miami could consist of a wind-driven contribution of 17 Sv along with a thermohaline component of 13 Sv. The latter might flow from the South Atlantic as upper layer compensation for a net lower layer cross-equatorial flow southward. The Sverdrup transport along 24-degrees-N in the interior North Atlantic east of 55-degrees-60-degrees-W is about 17 Sv, potentially matching the wind-driven component of the Florida Current. The circulation in the vicinity of 24-degrees-N and west of 55-degrees-60-degrees-W up to the Bahama Banks contains energetic, shorter spatial scale flows, where there is a similarity between the regional pattern of the Sverdrup transport contours and the scales and structure of the observed C-shaped pattern of dynamic height. C1 USN,RES LAB,DIV OCEAN SENSING & PREDICT,BAY ST LOUIS,MS 39529. RP SCHMITZ, WJ (reprint author), WOODS HOLE OCEANOG INST,WOODS HOLE,MA 02543, USA. RI Luyten, James/B-1855-2009 NR 36 TC 53 Z9 54 U1 1 U2 3 PU AMER GEOPHYSICAL UNION PI WASHINGTON PA 2000 FLORIDA AVE NW, WASHINGTON, DC 20009 SN 0148-0227 J9 J GEOPHYS RES-OCEANS JI J. Geophys. Res.-Oceans PD MAY 15 PY 1992 VL 97 IS C5 BP 7251 EP 7256 DI 10.1029/92JC00417 PG 6 WC Oceanography SC Oceanography GA HU911 UT WOS:A1992HU91100003 ER PT J AU MARMORINO, GO TRUMP, CL AF MARMORINO, GO TRUMP, CL TI ACOUSTIC DOPPLER CURRENT PROFILER MEASUREMENTS OF POSSIBLE LEE WAVES SOUTH OF KEY-WEST, FLORIDA SO JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS LA English DT Article ID INTERNAL WAVES AB Acoustic Doppler current profiler measurements made while underway in 200-240 m of water south of Key West, Florida, show wavelike signals with about 1 km horizontal wavelength and 3-5 cm s-1 amplitude vertical velocity. Vertical displacements of about 5 m are inferred from coherent oscillations in surfaces of constant acoustic backscatter, in features associated with the width of the peak in the Doppler spectrum, and in fine structure of vertical current shear. While the sampling was limited, all the measurable waves occurred over irregular bathymetry in the presence of an east-northeastward mean flow U > 1 m s-1 (averaged over 30- to 90-m depth). The peak strain rate associated with the waves was nearly 1 x 10(-3) s-1 at 12-m depth, and this could have produced bands of smooth and rough water observed at the surface. We tentatively identify the waves as being topographically forced by the Florida Current flowing over a rough continental margin. RP MARMORINO, GO (reprint author), USN,RES LAB,CTR ADV SPACE SENSING,CODE 4220,WASHINGTON,DC 20375, USA. NR 6 TC 5 Z9 5 U1 0 U2 0 PU AMER GEOPHYSICAL UNION PI WASHINGTON PA 2000 FLORIDA AVE NW, WASHINGTON, DC 20009 SN 0148-0227 J9 J GEOPHYS RES-OCEANS JI J. Geophys. Res.-Oceans PD MAY 15 PY 1992 VL 97 IS C5 BP 7271 EP 7275 DI 10.1029/92JC00480 PG 5 WC Oceanography SC Oceanography GA HU911 UT WOS:A1992HU91100005 ER PT J AU SALAT, J TINTORE, J FONT, J WANG, DP VIEIRA, M AF SALAT, J TINTORE, J FONT, J WANG, DP VIEIRA, M TI NEAR-INERTIAL MOTION ON THE SHELF-SLOPE FRONT OFF NORTHEAST SPAIN SO JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS LA English DT Article ID VIEW AB Near-inertial motion on the shelf-slope front off northeast Spain was monitored using surface drifters and moored current meters. On the shelf, strong inertial currents were generated by a wind burst. The inertial current amplitude was about 70 cm/s at the surface, 30 cm/s at the base of the mixed layer, and 10 cm/s in the interior. The observed near-inertial frequency on the shelf was about 10% lower than the local inertial frequency, suggesting that the near-inertial motion was embedded in region of strong anticyclonic shear. Also, the phase of near-inertial motion increased through the water column, indicating that the energy propagation was downward. By contrast, the surface inertial currents were only about 10 cm/s in the center of the shelf-slope front. Indirect evidence suggests that the observed small surface inertial currents were the result of rapid downward transfer of near-inertial energy in the front. C1 UNIV ILLES BALEARS,DEPT FIS,E-07071 PALMA DE MALLORCA,SPAIN. SUNY STONY BROOK,MARINE SCI RES CTR,STONY BROOK,NY 11794. USN ACAD,DEPT OCEANOG,ANNAPOLIS,MD 21402. RP SALAT, J (reprint author), INST CIENCIES MAR,PASSERG NACL S-N,E-08003 BARCELONA,SPAIN. RI Font, Jordi/E-5355-2013; Salat, Jordi/F-9328-2013 OI Font, Jordi/0000-0003-2590-1457; Salat, Jordi/0000-0001-6139-5673 NR 12 TC 39 Z9 39 U1 0 U2 3 PU AMER GEOPHYSICAL UNION PI WASHINGTON PA 2000 FLORIDA AVE NW, WASHINGTON, DC 20009 SN 0148-0227 J9 J GEOPHYS RES-OCEANS JI J. Geophys. Res.-Oceans PD MAY 15 PY 1992 VL 97 IS C5 BP 7277 EP 7281 DI 10.1029/92JC00588 PG 5 WC Oceanography SC Oceanography GA HU911 UT WOS:A1992HU91100006 ER PT J AU HORTON, CW PORTER, DL DEWITT, PW RANKIN, WE AF HORTON, CW PORTER, DL DEWITT, PW RANKIN, WE TI AIRBORNE EXPENDABLE BATHYTHERMOGRAPH SURVEY OF THE KUROSHIO EXTENSION AND COMPARISON WITH SIMULTANEOUS ALTIMETER MEASUREMENTS DURING THE GEOSAT EXACT REPEAT MISSION SO JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS LA English DT Article ID WARM-CORE RINGS; TOPOGRAPHY; TRANSPORT; SATELLITE; VELOCITY; PACIFIC AB Extensive airborne expendable bathythemograph (AXBT) sections across the Kuroshio Extension during the Geosat Exact Repeat Mission (ERM) were used to assess the ability of the Geosat altimeter to monitor the locations of the Kuroshio and its associated cold- and warm-core eddies. The AXBT sections in themselves provide detailed descriptions of the Kuroshio Extension to about 160-degrees-E. These observations demonstrated that surface or near-surface temperatures in this area may lead to incomplete and deceptive descriptions of the deeper thermal structure. Kuroshio-eddy interactions in particular were not accurately portrayed by the near-surface observations. For this reason, accurate mapping of the location of the Kuroshio Extension and of nearby eddies may not be practical from infrared (IR) imagery alone but requires augmentation from other measurement systems such as altimetry. In the present analysis, an estimate of the sea surface height was obtained from the altimeter ranges by time averaging sea surface heights in lieu of a geoid estimate. Sea surface height anomalies computed using the mean altimetric sea surface (i.e., the geoid plus the temporal mean oceanographic signal) can be significantly different from the actual oceanographic topography induced by mesoscale oceanographic features. Nevertheless, it is shown that the positions of the Kuroshio Extension and of the stronger cold- and warm-core eddies associated with the Kuroshio Extension are easily located from these altimetric sea surface anomalies. C1 FLEET NUMER OCEANOG CTR,MONTEREY,CA 93940. JOHNS HOPKINS UNIV,APPL PHYS LAB,LAUREL,MD 20723. RP HORTON, CW (reprint author), USN,OCEANOG OFF,BAY ST LOUIS,MS 39522, USA. NR 22 TC 8 Z9 8 U1 0 U2 0 PU AMER GEOPHYSICAL UNION PI WASHINGTON PA 2000 FLORIDA AVE NW, WASHINGTON, DC 20009 SN 0148-0227 J9 J GEOPHYS RES-OCEANS JI J. Geophys. Res.-Oceans PD MAY 15 PY 1992 VL 97 IS C5 BP 7447 EP 7463 DI 10.1029/92JC00418 PG 17 WC Oceanography SC Oceanography GA HU911 UT WOS:A1992HU91100018 ER PT J AU BLAHA, J LUNDE, B AF BLAHA, J LUNDE, B TI CALIBRATING ALTIMETRY TO GEOPOTENTIAL ANOMALY AND ISOTHERM DEPTHS IN THE WESTERN NORTH-ATLANTIC SO JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS LA English DT Article ID ACOUSTIC DOPPLER DATA; GULF-STREAM; SATELLITE ALTIMETRY; VARIABILITY; ENERGETICS; TRANSPORT; INVERSION; PROFILES; SECTIONS AB Sixty-two temperature sections were taken to depths of 800 m by aircraft along Geosat ground tracks within 1-2 days of the satellite orbit. The sections are 500-700 km long and cross the Gulf Stream and its rings. From pairs of sections that repeat on the same ground track, collinear differences of geopotential anomaly (0/25 MPa) and the depth of the 16-degrees-C isotherm were collected as along-track signals of the change of baroclinic conditions. The corresponding collinear differences of sea elevation were collected from the Geosat orbits. These difference signals, from aircraft and altimeter, were fit to one another along common ground track segments by removing residual orbit error as a tilt and bias and proportionally scaling the magnitudes of the signals. The ratio of geopotential anomaly to sea elevation by this method is 0.84 +/- 0.10 dyn m m-1. That is, fluctuations of geopotential anomaly which correlate to sea elevation across the Gulf Stream are smaller by this proportional value. The difference of this ratio from unity is consistent with a barotropic signal of about 0.10 m, as estimated from reported measurements of abyssal velocity under the stream. Because the uncertainties in the aircraft data are of the same order as the scatter in the calibration, it is unclear whether greater precision is impeded primarily by these uncertainties or by random barotropic signals. The ratio of the displacement of 16-degrees-C to sea elevation is 480 +/- 75. RP BLAHA, J (reprint author), USN,OCEANOG OFF,BAY ST LOUIS,MS 39522, USA. NR 31 TC 9 Z9 9 U1 0 U2 0 PU AMER GEOPHYSICAL UNION PI WASHINGTON PA 2000 FLORIDA AVE NW, WASHINGTON, DC 20009 SN 0148-0227 J9 J GEOPHYS RES-OCEANS JI J. Geophys. Res.-Oceans PD MAY 15 PY 1992 VL 97 IS C5 BP 7465 EP 7477 DI 10.1029/92JC00249 PG 13 WC Oceanography SC Oceanography GA HU911 UT WOS:A1992HU91100019 ER PT J AU FENG, CR MICHEL, DJ AF FENG, CR MICHEL, DJ TI MICROSTRUCTURES OF NB-26TI-48AL+(NB,TI)B SO MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING LA English DT Article; Proceedings Paper CT 2ND INTERNATIONAL CONF ON HIGH TEMPERATURE ALUMINIDES AND INTERMETALLICS CY SEP 16-19, 1991 CL SAN DIEGO, CA SP AMER SOC MET AB The microstructures of Nb-26at.%Ti-48at.%Al + 10vol.%(Nb0.67,Ti0.33)B prior to and after creep testing were studied by transmission electron microscopy. The matrix of this alloy exhibits a gamma + sigma-two-phase structure. The axis of an (Nb0.67, Ti0.33)B whisker was [010] which was found to be parallel to [011]gamma. Twins and 1/2[110] dislocations were observed in the gamma-grains which were emitted from the whisker/gamma interfaces and the sigma/gamma-interfaces. Extensive 1/2[110] dislocations were observed in the creep deformed specimen. It was also noticed that 1/2[110] dislocations were pinned by precipitates and small dislocation loops which might contribute to the observed low creep rates. RP FENG, CR (reprint author), USN,RES LAB,DIV MAT SCI & TECHNOL,WASHINGTON,DC 20375, USA. NR 8 TC 6 Z9 6 U1 0 U2 1 PU ELSEVIER SCIENCE SA LAUSANNE PI LAUSANNE 1 PA PO BOX 564, 1001 LAUSANNE 1, SWITZERLAND SN 0921-5093 J9 MAT SCI ENG A-STRUCT JI Mater. Sci. Eng. A-Struct. Mater. Prop. Microstruct. Process. PD MAY 15 PY 1992 VL 152 IS 1-2 BP 202 EP 207 DI 10.1016/0921-5093(92)90068-C PG 6 WC Nanoscience & Nanotechnology; Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Science & Technology - Other Topics; Materials Science; Metallurgy & Metallurgical Engineering GA JA968 UT WOS:A1992JA96800032 ER PT J AU PINTO, JF ESTEROWITZ, L ROSENBLATT, GH AF PINTO, JF ESTEROWITZ, L ROSENBLATT, GH TI CONTINUOUS-WAVE MODE-LOCKED 2-MU-M TM - YAG LASER SO OPTICS LETTERS LA English DT Article ID EFFICIENT AB Continuous-wave mode-locked operation of a 2-mu-m Tm: YAG laser is demonstrated. Stable, transform-limited Pulses of 35-ps duration have been generated at a repetition rate of 300 MHz, with an average output power of 70 mW. C1 SFA INC,LANDOVER,MD 20785. RP PINTO, JF (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 9 TC 33 Z9 34 U1 1 U2 10 PU OPTICAL SOC AMER PI WASHINGTON PA 2010 MASSACHUSETTS AVE NW, WASHINGTON, DC 20036 SN 0146-9592 J9 OPT LETT JI Opt. Lett. PD MAY 15 PY 1992 VL 17 IS 10 BP 731 EP 732 DI 10.1364/OL.17.000731 PG 2 WC Optics SC Optics GA HT344 UT WOS:A1992HT34400011 PM 19794612 ER PT J AU STONEMAN, RC ESTEROWITZ, L AF STONEMAN, RC ESTEROWITZ, L TI INTRACAVITY-PUMPED 2.09-MU-M HO - YAG LASER SO OPTICS LETTERS LA English DT Article ID SOLID-STATE LASERS AB The 2.09-mu-m Ho:YAG I-5(7) --> I-5(8) laser transition is intracavity pumped by a Tm:YAG laser. Separate Tm:YAG and Ho:YAG crystals share a single laser cavity, the Tm:YAG crystal is pumped at 785 nm, and the resulting 2.01-mu-m Tm3+ laser emission pumps the Ho:YAG crystal. The slope efficiency of the 2.09-mu-m Ho3+ laser output is 42% of the absorbed 785-nm pump power. RP STONEMAN, RC (reprint author), USN,RES LAB,CODE 6551,WASHINGTON,DC 20375, USA. NR 9 TC 68 Z9 70 U1 1 U2 13 PU OPTICAL SOC AMER PI WASHINGTON PA 2010 MASSACHUSETTS AVE NW, WASHINGTON, DC 20036 SN 0146-9592 J9 OPT LETT JI Opt. Lett. PD MAY 15 PY 1992 VL 17 IS 10 BP 736 EP 738 DI 10.1364/OL.17.000736 PG 3 WC Optics SC Optics GA HT344 UT WOS:A1992HT34400013 PM 19794614 ER PT J AU SHARMA, J BEARD, BC KINLOCH, SA VOLK, F AF SHARMA, J BEARD, BC KINLOCH, SA VOLK, F TI SPECTROSCOPY OF REACTED SURFACES SO PHILOSOPHICAL TRANSACTIONS OF THE ROYAL SOCIETY OF LONDON SERIES A-MATHEMATICAL PHYSICAL AND ENGINEERING SCIENCES LA English DT Article ID SHOCK AB Explosives were driven to the brink of ignition by shock or impact. The microscopic sites of early reaction in the damaged materials were investigated by scanning electron microscopy for their physical structure and by X-ray photoelectron spectroscopy for their chemistry. Morphological defects of micrometre or smaller size were observable on the surfaces and edges of the crystals. Near these defects chemically altered debris from the explosive was found. These contained reaction products which are more sensitive than the original explosive or have suffered exothermic reaction. The combination of morphological defects, sensitized products and exothermic energy would qualify these sites as hot spots where reaction could restart. at a lower stimulus. This provides us with an explanation for the sensitization of roughly handled explosives and gives us some insight into the early steps of the ignition process. C1 FRAUNHOFER INST,W-7800 FREIBURG,GERMANY. ROYAL MIL COLL SCI,SHRIVENHAM,ENGLAND. RP SHARMA, J (reprint author), USN,CTR SURFACE WARFARE,SILVER SPRING,MD 20903, USA. NR 20 TC 0 Z9 0 U1 0 U2 0 PU ROYAL SOC LONDON PI LONDON PA 6 CARLTON HOUSE TERRACE, LONDON, ENGLAND SW1Y 5AG SN 0962-8428 J9 PHILOS T ROY SOC A JI Philos. Trans. R. Soc. Lond. Ser. A-Math. Phys. Eng. Sci. PD MAY 15 PY 1992 VL 339 IS 1654 BP 285 EP 292 DI 10.1098/rsta.1992.0035 PG 8 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA HV880 UT WOS:A1992HV88000003 ER PT J AU BAILEY, A BELLERBY, JM KINLOCH, SA BEARD, BC SHERWOOD, JN CHAUDHRI, MM SHARMA, J BAUGHAN, EC AF BAILEY, A BELLERBY, JM KINLOCH, SA BEARD, BC SHERWOOD, JN CHAUDHRI, MM SHARMA, J BAUGHAN, EC TI THE IDENTIFICATION OF BONDING AGENTS FOR TATB HTPB POLYMER BONDED EXPLOSIVES SO PHILOSOPHICAL TRANSACTIONS OF THE ROYAL SOCIETY OF LONDON SERIES A-MATHEMATICAL PHYSICAL AND ENGINEERING SCIENCES LA English DT Article AB To obtain a polymer bonded explosive (PBX) With acceptable properties it is generally considered necessary to modify the bonding of the filler explosive to the polymer matrix. This is usually achieved by the addition of a 'bonding agent '. This paper describes an investigation of the interaction of some bonding agents with the surface of the insensitive high explosive 1,3,5-triamino-2.4,6-trinitro-benzene. The mechanical properties of the surface modified explosive loaded into a matrix of isocyanate cured hydroxy-terminated polybutadiene have also been studied to elucidate the role of the bonding agent and produce a PBX with high extensibility. C1 UNIV CAMBRIDGE,CAMBRIDGE,ENGLAND. UNIV STRATHCLYDE,GLASGOW G1 1XW,SCOTLAND. USN,CTR SURFACE WEAPONS,SILVER SPRING,MD 20903. RP BAILEY, A (reprint author), ROYAL MIL COLL SCI,SCH MECH MAT & CIVIL ENGN,CHEM SYST GRP,SHRIVENHAM SN6 8LA,ENGLAND. NR 16 TC 9 Z9 9 U1 1 U2 4 PU ROYAL SOC LONDON PI LONDON PA 6 CARLTON HOUSE TERRACE, LONDON, ENGLAND SW1Y 5AG SN 0962-8428 J9 PHILOS T ROY SOC A JI Philos. Trans. R. Soc. Lond. Ser. A-Math. Phys. Eng. Sci. PD MAY 15 PY 1992 VL 339 IS 1654 BP 321 EP 333 DI 10.1098/rsta.1992.0038 PG 13 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA HV880 UT WOS:A1992HV88000006 ER PT J AU MANDELBAUM, P SEELY, JF FELDMAN, U BROWN, CM KANIA, DR GOLDSTEIN, WH KAUFFMAN, RL LANGER, S BARSHALOM, A AF MANDELBAUM, P SEELY, JF FELDMAN, U BROWN, CM KANIA, DR GOLDSTEIN, WH KAUFFMAN, RL LANGER, S BARSHALOM, A TI DENSITY DIAGNOSTIC OF A URANIUM LASER-PRODUCED PLASMA FROM THE LINE RATIO OF DELTA-N=1 TRANSITIONS IN NI-LIKE URANIUM SO PHYSICAL REVIEW A LA English DT Article ID X-RAY-SPECTRA; RANGE; TANTALUM; ATOMS; MODEL; IONS; TM; AU AB The intensity ratio of the electric quadrupole 3p(6)3d10-3p3/2(5)4f7/2(J = 2) line to the electric dipole 3p(6)3d10-3p1/2(5)4s line is used as a density diagnostic of a highly ionized uranium laser-produced plasma for electron densities of 10(19)-10(23) cm-3. Calculations show that this ratio is insensitive to the plasma temperature in the range of 1000-4000 eV. Self-absorption of the lines is shown to be unimportant in this density range. Experimental line ratios are compared to the predictions of a Ni-like uranium-ion model that includes 138 excited levels. The densities inferred from this analysis applied to a measured line ratio yield densities of (4.0 +/- 0.5) x 10(22) cm-3. This is in good agreement with models of x-ray production in laser-produced plasmas. C1 LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550. NUCL RES CTR NEGEV,IL-84190 BEER SHEVA,ISRAEL. HEBREW UNIV JERUSALEM,RACAH INST PHYS,IL-91904 JERUSALEM,ISRAEL. RP MANDELBAUM, P (reprint author), USN,RES LAB,EO HULBURT CTR SPACE RES,WASHINGTON,DC 20375, USA. NR 20 TC 4 Z9 4 U1 3 U2 3 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1050-2947 J9 PHYS REV A JI Phys. Rev. A PD MAY 15 PY 1992 VL 45 IS 10 BP 7480 EP 7483 DI 10.1103/PhysRevA.45.7480 PG 4 WC Optics; Physics, Atomic, Molecular & Chemical SC Optics; Physics GA HV267 UT WOS:A1992HV26700063 ER PT J AU MANDELBAUM, P SEELY, JF KANIA, DR KAUFFMAN, RL AF MANDELBAUM, P SEELY, JF KANIA, DR KAUFFMAN, RL TI 3D-4P X-RAY-SPECTRUM EMITTED BY HIGHLY IONIZED URANIUM FROM A LASER-PRODUCED PLASMA IN THE 3.8-LESS-THAN-LAMBDA-LESS-THAN-4.4-ANGSTROM WAVELENGTH RANGE SO PHYSICAL REVIEW A LA English DT Article ID TRANSITION ARRAYS; ATOMIC SPECTRA; ENERGY-LEVELS; DISTRIBUTIONS; VARIANCE AB This work extends a previous analysis of the x-ray spectrum of a laser-produced uranium plasma [P. Mandelbaum et al., Phys. Rev. A 44, 5752 (1991)] to the longer-wavelength range (3.8 < lambda < 4.4 angstrom) which includes the 3d-4p transitions. Detailed analysis of the spectrum has been performed using the HULLAC computer code and the unresolved-transition-array formalism. 3d-4p transitions emitted from ions belonging to the Co-like (U+65) through As-like (U+59) isoelectronic sequences are identified in the spectrum, in good agreement with the previous analysis of the spectrum emitted at shorter wavelengths. C1 LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550. HEBREW UNIV JERUSALEM,RACAH INST PHYS,IL-91904 JERUSALEM,ISRAEL. RP MANDELBAUM, P (reprint author), USN,RES LAB,EO HULBURT CTR SPACE RES,WASHINGTON,DC 20375, USA. NR 12 TC 0 Z9 0 U1 1 U2 1 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1050-2947 J9 PHYS REV A JI Phys. Rev. A PD MAY 15 PY 1992 VL 45 IS 10 BP 7484 EP 7487 DI 10.1103/PhysRevA.45.7484 PG 4 WC Optics; Physics, Atomic, Molecular & Chemical SC Optics; Physics GA HV267 UT WOS:A1992HV26700064 ER PT J AU FREUND, HP JACKSON, RH AF FREUND, HP JACKSON, RH TI SELF-CONSISTENT ANALYSIS OF WIGGLER-FIELD ERRORS IN FREE-ELECTRON LASERS SO PHYSICAL REVIEW A LA English DT Article ID MAGNETIC-FIELD; RADIATION AB A self-consistent analysis of wiggler-field errors in free-electron lasers is described using the three-dimensional simulation code WIGGLIN. A random variation is chosen for the pole-to-pole wiggler amplitude, and a continuous map is used between the pole faces. On average, increases in the root-mean-square value of the field causes a decrease in the interaction efficiency; however, this is relatively benign for the specific case studied, and particular error distributions can result in efficiency enhancements. C1 SCI APPLICAT INT CORP,MCLEAN,VA 22102. RP FREUND, HP (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 18 TC 9 Z9 9 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1050-2947 J9 PHYS REV A JI Phys. Rev. A PD MAY 15 PY 1992 VL 45 IS 10 BP 7488 EP 7491 DI 10.1103/PhysRevA.45.7488 PG 4 WC Optics; Physics, Atomic, Molecular & Chemical SC Optics; Physics GA HV267 UT WOS:A1992HV26700065 ER PT J AU TANG, CM KRALL, J SWYDEN, T AF TANG, CM KRALL, J SWYDEN, T TI THEORY OF ELECTROMAGNETIC-INSTABILITY OF AN INTENSE BEAM IN A QUADRUPOLE FOCUSING SYSTEM SO PHYSICAL REVIEW A LA English DT Article AB Discrete quadrupole focusing systems are subject to an electromagnetic instability wherein the growing transverse motion of the beam interacts with the quadrupole field and the TE11 waveguide mode. The dispersion relation is derived, which is a matrix equation of infinite dimensions. We show that an appropriately truncated matrix equation is able to give exact growth rates. Furthermore, analytical growth rates are obtained and instability boundaries are established. Numerical solutions of the dispersion relation show that the overall stability properties are not favorable for long-pulse, high-current electron beams. The stability properties of ion beams are also discussed. C1 FM TECHNOL INC,FAIRFAX,VA 22032. RP TANG, CM (reprint author), USN,RES LAB,DIV PLASMA PHYS,BEAM PHYS BRANCH,WASHINGTON,DC 20375, USA. NR 7 TC 1 Z9 1 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1050-2947 J9 PHYS REV A JI Phys. Rev. A PD MAY 15 PY 1992 VL 45 IS 10 BP 7492 EP 7499 DI 10.1103/PhysRevA.45.7492 PG 8 WC Optics; Physics, Atomic, Molecular & Chemical SC Optics; Physics GA HV267 UT WOS:A1992HV26700066 ER PT J AU BROZAK, G SHANABROOK, BV GAMMON, D BROIDO, DA BERESFORD, R WANG, WI AF BROZAK, G SHANABROOK, BV GAMMON, D BROIDO, DA BERESFORD, R WANG, WI TI EFFECTS OF NONPARABOLICITY ON COLLECTIVE INTERSUBBAND EXCITATIONS SO PHYSICAL REVIEW B LA English DT Note ID SEMICONDUCTOR QUANTUM WELLS; EXCHANGE; CHARGE AB We have used inelastic light scattering to study the collective charge- and spin-density excitations associated with electronic intersubband transitions in GaSb-AlSb superlattices. The density of the photoexcited two-dimensional electron-hole plasma was controlled by varying the incident laser power. A comparison of experiment with detailed calculations of the response functions shows that the nonparabolicity of the conduction band must be properly included in order to yield quantitative agreement. It is found that nonparabolicity, in addition to decreasing the resonance energies of the collective excitations, provides a mechanism for observing single-particle excitations at q = 0. C1 BOSTON COLL, CHESTNUT HILL, MA 02167 USA. COLUMBIA UNIV, NEW YORK, NY 10027 USA. RP USN, RES LAB, WASHINGTON, DC 20375 USA. NR 17 TC 12 Z9 12 U1 0 U2 1 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 MAY 15 PY 1992 VL 45 IS 19 BP 11399 EP 11402 DI 10.1103/PhysRevB.45.11399 PG 4 WC Physics, Condensed Matter SC Physics GA HU799 UT WOS:A1992HU79900077 ER PT J AU RICHARDSON, G MAKOUS, JL YU, HY EDELSTEIN, AS AF RICHARDSON, G MAKOUS, JL YU, HY EDELSTEIN, AS TI ELASTIC-CONSTANT SOFTENING IN NONPERIODIC MO/NI MULTILAYERS SO PHYSICAL REVIEW B LA English DT Note ID COMPOSITION-MODULATED ALLOYS; BEAM-SPUTTERED CU/NI; STRUCTURAL-PROPERTIES; THIN-FILMS; SUPER-LATTICES; SUPERLATTICES; FOILS; MODULUS; NICKEL; PALLADIUM AB Surface-acoustic-wave velocity measurements on nonperiodic Mo/Ni multilayers show that an electronic mechanism based on minizone boundaries is not responsible for the softening of the c44 elastic constant that occurs at small modulation wavelengths in periodic samples. The spacings between the x-ray satellite peaks of the nonperiodic multilayers are not equal. Model calculations predict these spacings and show that the satellite positions depend on the individual atomic interplanar spacings and not just the average modulation wavelength. RP RICHARDSON, G (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 29 TC 11 Z9 11 U1 0 U2 1 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD MAY 15 PY 1992 VL 45 IS 20 BP 12114 EP 12117 DI 10.1103/PhysRevB.45.12114 PG 4 WC Physics, Condensed Matter SC Physics GA HV747 UT WOS:A1992HV74700081 ER PT J AU PEHRSSON, PE GLESENER, J MORRISH, A AF PEHRSSON, PE GLESENER, J MORRISH, A TI CHEMICAL VAPOR-DEPOSITION DIAMOND NUCLEATION INDUCED BY SP(2) CARBON ON UNSCRATCHED SILICON SO THIN SOLID FILMS LA English DT Article ID THIN-FILMS; GROWTH; MORPHOLOGY; IDENTIFICATION; CRYSTALS; SURFACES; PHASE AB Chemical vapor deposition (CVD) diamond nucleation is enhanced on most substrates by scratching with diamond grit prior to growth. The damage induced by such scratching makes this an unsuitable technique for many applications, and sheds little light on fundamental nucleation mechanisms, since the bulk of the crystals on such substrates probably grow homoepitaxially on diamond fragments embedded in the substrate during scratching. In this paper, we describe recent results in which unscratched silicon substrates overlaid with carbon fibers undergo very rapid and heavy CVD diamond nucleation when exposed to CVD diamond growth conditions. Exposure of such fiber-treated substrates to high temperature in an ultrahigh vacuum induces the formation of etch pits and trails of particulate debris which are extremely efficient diamond nucleators. Both the pits and the debris are carbon rich, and thus satisfy two criteria for "spontaneous", i.e. non-epitaxial growth; (1) carbon saturation of the substrate surface, and (2) the presence of high-energy edge sites. The specific relationships between these characteristics and CVD diamond nucleation are discussed. C1 USN, RES LAB, DIV OPT SCI, WASHINGTON, DC 20375 USA. RP PEHRSSON, PE (reprint author), USN, RES LAB, DIV CHEM, WASHINGTON, DC 20375 USA. NR 41 TC 29 Z9 29 U1 0 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 MAY 15 PY 1992 VL 212 IS 1-2 BP 81 EP 90 DI 10.1016/0040-6090(92)90503-4 PG 10 WC Materials Science, Multidisciplinary; Materials Science, Coatings & Films; Physics, Applied; Physics, Condensed Matter SC Materials Science; Physics GA HW794 UT WOS:A1992HW79400013 ER PT J AU BENDLER, JT SHLESINGER, MF AF BENDLER, JT SHLESINGER, MF TI DEFECT DIFFUSION AND A 2-FLUID MODEL FOR STRUCTURAL RELAXATION NEAR THE GLASS LIQUID TRANSITION SO JOURNAL OF PHYSICAL CHEMISTRY LA English DT Article ID LAW AB A model is presented for supercooled liquids above the liquid-glass transition containing long-lived order parameter fluctuations, though no average order. The order parameter fluctuations (OPF) are those which would have led to crystallization if their size and concentration had not been kinetically arrested. Being more dense than the isotropic fluid, the regions containing fluctuations are more rigid and relax more slowly. Concentrations of OPF are spatially varying and cause excess light scattering and depolarization, both of which are seen experimentally in polymeric and nonpolymeric glasses. A free energy mismatch between the isotropic fluid and the OPF causes the mixture to attempt to separate into OPF-rich and isotropic-rich fluid phases. As temperature falls mobility is lost; mobile defects in the isotropic fluid control the structural relaxation. This defect diffusion mechanism leads directly to Kohlrausch-Williams/Watts decay, and the phase separation process results in a generalized Vogel-Flucher or WLF temperature dependence as defects cluster and lose mobility. Predictions for the Landau-Placzek ratio and the Vogel behavior agree well with experiment for o-terphenyl. Scaling relations, analogous to those found from mode coupling theories, exist between the alpha and beta processes, though with different exponents. C1 OFF NAVAL RES,DIV PHYS,ARLINGTON,VA 22217. RP BENDLER, JT (reprint author), GE,RES & DEV,BIOL SCI LAB,SCHENECTADY,NY 12301, USA. NR 27 TC 57 Z9 57 U1 1 U2 3 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0022-3654 J9 J PHYS CHEM-US JI J. Phys. Chem. PD MAY 14 PY 1992 VL 96 IS 10 BP 3970 EP 3973 DI 10.1021/j100189a012 PG 4 WC Chemistry, Physical SC Chemistry GA HV240 UT WOS:A1992HV24000012 ER PT J AU SHINBROT, T DITTO, W GREBOGI, C OTT, E SPANO, M YORKE, JA AF SHINBROT, T DITTO, W GREBOGI, C OTT, E SPANO, M YORKE, JA TI USING THE SENSITIVE DEPENDENCE OF CHAOS (THE BUTTERFLY EFFECT) TO DIRECT TRAJECTORIES IN AN EXPERIMENTAL CHAOTIC SYSTEM SO PHYSICAL REVIEW LETTERS LA English DT Article AB In this paper we present the first experimental verification that the sensitivity of a chaotic system to small perturbations (the "butterfly effect") can be used to rapidly direct orbits from an arbitrary initial state to an arbitrary accessible desired state. C1 USN,CTR SURFACE WARFARE,SILVER SPRING,MD 20902. UNIV MARYLAND,DEPT PHYS,COLLEGE PK,MD 20742. COLL WOOSTER,DEPT PHYS,WOOSTER,OH 44691. UNIV MARYLAND,DEPT MATH,COLLEGE PK,MD 20742. UNIV MARYLAND,DEPT ELECT ENGN,COLLEGE PK,MD 20742. UNIV MARYLAND,PLASMA RES LAB,COLLEGE PK,MD 20742. RP SHINBROT, T (reprint author), UNIV MARYLAND,INST PHYS SCI & TECHNOL,COLLEGE PK,MD 20742, USA. RI Spano, Mark/B-6883-2011; O, E/F-1630-2015; OI Ditto, William/0000-0002-7416-8012 NR 4 TC 129 Z9 130 U1 1 U2 3 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0031-9007 J9 PHYS REV LETT JI Phys. Rev. Lett. PD MAY 11 PY 1992 VL 68 IS 19 BP 2863 EP 2866 DI 10.1103/PhysRevLett.68.2863 PG 4 WC Physics, Multidisciplinary SC Physics GA HT648 UT WOS:A1992HT64800002 ER PT J AU DENNINGHAM, RL BROWN, RB LEE, JN AF DENNINGHAM, RL BROWN, RB LEE, JN TI HIGHLY PARALLEL ARCHITECTURE FOR OPTICAL DISK DATABASE CORRELATION WITH COMPENSATION FOR DATABASE ERRORS SO APPLIED OPTICS LA English DT Article DE OPTICAL DISK; CORRELATOR AB Architectural prototypes and algorithms for performing many simultaneous complex correlations between external data and data stored on optical disks are presented. External data are modulated onto an addressing light beam acoustooptically. Analog correlation outputs are obtained at low bandwidth. Data may be encoded on the disk either digitally, and correlated by using a digital multiplication by analog convolution scheme, or by analog area modulation. Bipolar correlations are shown possible without data biasing when two auxiliary diode lasers are used in a sign determination scheme. Error issues include variations in reflectances of encoded bits and raw disk errors. RP DENNINGHAM, RL (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 10 TC 1 Z9 1 U1 0 U2 0 PU OPTICAL SOC AMER PI WASHINGTON PA 2010 MASSACHUSETTS AVE NW, WASHINGTON, DC 20036 SN 0003-6935 J9 APPL OPTICS JI Appl. Optics PD MAY 10 PY 1992 VL 31 IS 14 BP 2607 EP 2614 PG 8 WC Optics SC Optics GA HT103 UT WOS:A1992HT10300029 PM 20725187 ER PT J AU VERSCHUUR, GL RICKARD, LJ VERTER, F POUND, MW LEISAWITZ, D AF VERSCHUUR, GL RICKARD, LJ VERTER, F POUND, MW LEISAWITZ, D TI THE SEPARATION BETWEEN GAS AND DUST FILAMENTS AT THE EDGE OF THE EXPANDING SHELL IN ERIDANUS SO ASTROPHYSICAL JOURNAL LA English DT Article DE DUST, EXTINCTION; ISM-INDIVIDUAL (ERIDANUS); RADIO LINES-ATOMIC ID HIGH GALACTIC LATITUDES; H-ALPHA FILAMENTS; INTERSTELLAR GRAINS; INFRARED-EMISSION; MOLECULAR CLOUDS; GALAXY; SCALE; ASSOCIATION; EXTINCTION; DIRECTIONS AB Adjacent filaments of ionized hydrogen, neutral hydrogen, and dust cross a 120 square degree region around l = 187-degrees, b = -50-degrees, at the boundary of a large expanding shell in Eridanus. The dust is visible on the IRAS Sky Flux Plates and looks like typical "interstellar cirrus." The morphology observed in H I emission is very similar, but with associated structures offset in position by amounts that vary across the region. The H I and IR filaments are approximately 1-degree wide and are offset by up to 0.8-degrees. All of the separation measurements have confidence levels of 95% or more. The H I and IR filaments are separated from parallel H-alpha filaments by 3-degrees-4-degrees. For the H I and IR emission in this region of the sky, a point-by-point comparison yields a very weak correlation between I(100) and N(HI); however, when I(100) at a dust feature is compared to N(H I) at the associated (offset) H I feature, a relationship close to that reported by other workers is revealed. Specifically, the nature of the separation between gas and dust is that the primary H I filament is deficient in dust by an order of magnitude, whereas the corresponding dust filament has sufficient gas to reproduce the dust/gas mass ratio approximately 1 x 10(-3) that is expected for cirrus. Observations of CO emission from this region show that the separation between the structures in the H I and IR emission is not due to a transition of the gas into molecular hydrogen at the location of the IR filaments. Indeed, the molecular hydrogen column density of these filaments is at least two orders of magnitude below what is typically seen in high-latitude molecular clouds. As the H I and dust in this region are associated with a large expanding shell (or superbubble), the action of shocks and radiation fields may be responsible for the separation of gas and dust. Such shells are believed to be common in the Galaxy, and therefore similar separations of gas and dust at other shell boundaries may be expected. Unless the gas and dust structures are resolved and lie in a favorable viewing geometry, the effect would tend to be hidden. Our results emphasize that it is not always evident, from observations with spatial resolutions coarser than a few arcminutes, how interstellar gas and dust are related. C1 USN,RES LAB,CTR ADV SPACE SENSING,WASHINGTON,DC 20375. NASA,GODDARD SPACE FLIGHT CTR,GREENBELT,MD 20771. AT&T BELL LABS,MURRAY HILL,NJ 07974. RI Pound, Marc/A-1600-2010 NR 51 TC 18 Z9 18 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 MAY 10 PY 1992 VL 390 IS 2 BP 514 EP & DI 10.1086/171302 PN 1 PG 0 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA HR232 UT WOS:A1992HR23200022 ER PT J AU GRINDLAY, NR FOX, PJ VOGT, PR AF GRINDLAY, NR FOX, PJ VOGT, PR TI MORPHOLOGY AND TECTONICS OF THE MID-ATLANTIC RIDGE (2-DEGREES-27-DEGREES-30'S) FROM SEA BEAM AND MAGNETIC DATA SO JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH LA English DT Article ID CLIPPERTON TRANSFORM-FAULT; ALONG-AXIS VARIATIONS; EAST PACIFIC RISE; SOUTH-ATLANTIC; FRACTURE-ZONES; PLATE BOUNDARY; SPREADING CENTERS; CRUSTAL STRUCTURE; OCEANIC-CRUST; RIFT-VALLEY AB High-resolution Sea Beam bathymetry and sea surface magnetic data have been collected between 25-degrees-S and 27-degrees-30'S on the Mid-Atlantic Ridge. Analysis of the morphology and structure of the ridge axis and flanking terrain as well as the results of a three-dimensional inversion of sea surface magnetic data are presented. This 227-km-long portion of the Mid-Atlantic Ridge is offset 42 km by the right-lateral Rio Grande Transform at 25-degrees-40'S and 9.5 km by the left-lateral nontransform Moore Discontinuity at 26-degrees-30'S. A third nontransform discontinuity, the Midway Discontinuity, exists near 26-degrees-12'S and is defined by a small displacement of the axial magnetization distribution and the disruption in the along-strike continuity of ridge-parallel terrain elements. Although the detailed survey presented in this paper extends out to only 5- to 7-m.y.-old crust, a regional compilation of magnetic data from this area by Cande et al. (1988) indicates that the relative positions and dimensions of the spreading cells have characterized this part of the Mid-Atlantic Ridge for at least the past 55 m.y. The offsets dimensions and geometries, however, have changed markedly because of prolonged differential asymmetric spreading between segments. Between and within the accretionary units that are spreading at uniform rates (35 mm/yr total opening rate), the morphology of the ridge axis varies dramatically, from a well-defined rift valley (20-25 km wide, 1-1.5 km deep) to an axial swell that rises 1500 m above the adjacent valley floor. The axial magnetic structure is also highly variable along-strike. The inversion solution shows a series of generally linear, short-wavelength (< 10 km) magnetization highs within the central Brunhes anomaly over each of the four segments in the survey area. These anomalies are interpreted to be the central anomaly magnetization high that is observed over the neovolcanic zones of many of the world's mid-ocean spreading centers. The distinct axial magnetization highs can extend out to 2-m.y.-old crust at ridge-discontinuity intersections, suggesting that in some instances they may also be the product temporal variations in the geochemistry of the extrusive rocks, e.g., highly fractionated and strongly magnetized basalts enriched in iron and titanium. The magnetic inversion shows that the central anomaly is locally attenuated at the minimum depth points of three of the four spreading segments in the survey area. Both inversion and forward modeling of magnetic data show that topography alone cannot produce the anomalously low values observed. In the case of an axial swell centered at 26-degrees-S, attenuation of the central anomaly is attributed to the effective thinning of the source layer by demagnetization effects of a crustal thermal anomaly and/or a zone of substantial alteration. Taken together, the bathymetric data and magnetic modeling document strong along-axis gradients in crustal and upper mantle properties. C1 USN,RES LAB,WASHINGTON,DC 20375. RP GRINDLAY, NR (reprint author), UNIV RHODE ISL,GRAD SCH OCEANOG,NARRAGANSETT,RI 02882, USA. RI Wright, Dawn/A-4518-2011 OI Wright, Dawn/0000-0002-2997-7611 NR 62 TC 57 Z9 60 U1 0 U2 4 PU AMER GEOPHYSICAL UNION PI WASHINGTON PA 2000 FLORIDA AVE NW, WASHINGTON, DC 20009 SN 0148-0227 J9 J GEOPHYS RES-SOL EA JI J. Geophys. Res.-Solid Earth PD MAY 10 PY 1992 VL 97 IS B5 BP 6983 EP 7010 DI 10.1029/91JB02981 PG 28 WC Geochemistry & Geophysics SC Geochemistry & Geophysics GA HT848 UT WOS:A1992HT84800026 ER PT J AU PARK, JG CHOE, GY HELMAN, LJ GAZDAR, AF YANG, HK KIM, JP PARK, SH KIM, YI AF PARK, JG CHOE, GY HELMAN, LJ GAZDAR, AF YANG, HK KIM, JP PARK, SH KIM, YI TI CHROMOGRANIN-A EXPRESSION IN GASTRIC AND COLON CANCER TISSUES SO INTERNATIONAL JOURNAL OF CANCER LA English DT Article ID SECRETORY PROTEIN-I; CELL LUNG-CANCER; ENDOCRINE-CELLS; NEURAL CREST; HUMAN-TUMORS; MARKERS; ARGYROPHIL; ORIGIN; DIFFERENTIATION; CARCINOMAS AB We studied the expression of chromogranin A (CgA) in human gastric (n = 17) and colorectal (n = 18) adenocarcinomas by nucleic acid hybridization and immunohistochemical analyses using a specific monoclonal antibody (MAb) to human chromogranin A (CgA). Some corresponding adjacent non-malignant mucosal tissues were also examined. Results: (1) Northern blotting: of 3 normal gastric mucosas examined, 2 (67%) had an easily detected signal for expression of CgA. Only one of 14 gastric carcinomas (7%) and one of 18 colorectal carcinomas (6%) had easily detected RNA signals. (2) Immunohistochemical staining: all non-malignant samples of gastric and colonic mucosa contained CgA-positive neuroendocrine (NE) cells. Two of 17 (12%) gastric adenocarcinomas, and 3 of 18 (17%) of colorectal adenocarcinomas contained CgA-positive tumor cells. Interestingly, the positive cases detected by immunohistochemistry included both cases detected by Northern blotting. Of the 5 cases detected by immunohistochemistry, 2 gastric cancers and I rectal carcinoma contained many diffusely scattered positive cells, occurring singly or in small clusters, while 2 colorectal carcinomas contained only occasional single CgA-positive tumor cells. In one of the positive gastric cases, a well-differentiated adenocarcinoma arising in a tubular adenoma, both the adenomatous and the carcinomatous elements contained positively staining cells. Our specific assays for CgA indicate that (1) a NE cell component, either diffusely scattered or occasional, occurs in about 15% of gastric and colorectal tumors; (2) there is no correlation between the presence of NE cells and degree of tumor differentiation; and (3) because only a minority of the tumor cells in positive cases stain for CgA, immunohistochemistry is a more sensitive method than Northern blotting. C1 SEOUL NATL UNIV,COLL MED,CANC RES INST,TUMOR CELL BIOL LAB,SEOUL 151,SOUTH KOREA. SEOUL NATL UNIV HOSP,DEPT SURG,SEOUL 110744,SOUTH KOREA. SEOUL NATL UNIV HOSP,DEPT PATHOL,SEOUL 110744,SOUTH KOREA. NCI,PEDIAT ONCOL BRANCH,BETHESDA,MD 20892. NCI,USN,MED ONCOL BRANCH,BETHESDA,MD 20892. RI Choe, Gheeyoung/G-5002-2011; Seoul National University, Pathology/B-6702-2012; Yang, Han-Kwang/J-2767-2012; Park, Seong Hoe/C-7353-2011; Park, Jae-Gahb/J-5494-2012 NR 34 TC 25 Z9 25 U1 0 U2 3 PU WILEY-LISS PI NEW YORK PA DIV JOHN WILEY & SONS INC 605 THIRD AVE, NEW YORK, NY 10158-0012 SN 0020-7136 J9 INT J CANCER JI Int. J. Cancer PD MAY 8 PY 1992 VL 51 IS 2 BP 189 EP 194 DI 10.1002/ijc.2910510205 PG 6 WC Oncology SC Oncology GA HT911 UT WOS:A1992HT91100004 PM 1349007 ER PT J AU BARRETT, DJ AF BARRETT, DJ TI AN ANISOTROPIC LAMINATED DAMPED PLATE-THEORY SO JOURNAL OF SOUND AND VIBRATION LA English DT Article ID BEAMS RP BARRETT, DJ (reprint author), USN,ADV STRUCT TECHNOL BRANCH,WARMINSTER,PA 18974, USA. NR 12 TC 11 Z9 14 U1 0 U2 0 PU ACADEMIC PRESS LTD PI LONDON PA 24-28 OVAL RD, LONDON, ENGLAND NW1 7DX SN 0022-460X J9 J SOUND VIB JI J. Sound Vibr. PD MAY 8 PY 1992 VL 154 IS 3 BP 453 EP 465 DI 10.1016/0022-460X(92)90779-W PG 13 WC Acoustics; Engineering, Mechanical; Mechanics SC Acoustics; Engineering; Mechanics GA HU518 UT WOS:A1992HU51800006 ER PT J AU SAKS, NS ANCONA, MG CHEN, WL AF SAKS, NS ANCONA, MG CHEN, WL TI EVALUATION OF THE 3-LEVEL CHARGE PUMPING TECHNIQUE FOR CHARACTERIZING INTERFACE TRAPS SO APPLIED PHYSICS LETTERS LA English DT Article AB Emission cross sections of Si-SiO2 interface traps have been measured as a function of trap energy with the new 3-level charge pumping technique and with standard admittance techniques. Good agreement between the different techniques is obtained, thereby validating 3-level charge pumping as a tool for characterizing interface traps. C1 YALE UNIV,NEW HAVEN,CT 06520. RP SAKS, NS (reprint author), USN,RES LAB,CODE 6813,WASHINGTON,DC 20375, USA. NR 14 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 MAY 4 PY 1992 VL 60 IS 18 BP 2261 EP 2263 DI 10.1063/1.107048 PG 3 WC Physics, Applied SC Physics GA HR210 UT WOS:A1992HR21000029 ER PT J AU HOFFMAN, CA MEYER, JR BARTOLI, FJ LANSARI, Y COOK, JW SCHETZINA, JF AF HOFFMAN, CA MEYER, JR BARTOLI, FJ LANSARI, Y COOK, JW SCHETZINA, JF TI SETBACK MODULATION DOPING OF HGTE-CDTE MULTIPLE QUANTUM-WELLS SO APPLIED PHYSICS LETTERS LA English DT Article ID TRANSPORT AB Photoassisted molecular beam epitaxy has been used to achieve the first setback modulation doping of HgTe-CdTe heterostructures. A 43 angstrom setback is found to yield a factor-of-2 increase of the mobility over any measured previously for intentionally doped samples, and an 81 angstrom setback leads to further enhancement of the mobility. C1 N CAROLINA STATE UNIV,RALEIGH,NC 27695. RP HOFFMAN, CA (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 11 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 MAY 4 PY 1992 VL 60 IS 18 BP 2282 EP 2284 DI 10.1063/1.107055 PG 3 WC Physics, Applied SC Physics GA HR210 UT WOS:A1992HR21000036 ER PT J AU FRIEDERSDORF, LE SEARSON, PC PROKES, SM GLEMBOCKI, OJ MACAULAY, JM AF FRIEDERSDORF, LE SEARSON, PC PROKES, SM GLEMBOCKI, OJ MACAULAY, JM TI INFLUENCE OF STRESS ON THE PHOTOLUMINESCENCE OF POROUS SILICON STRUCTURES SO APPLIED PHYSICS LETTERS LA English DT Article ID QUANTUM AB The blueshifting of photoluminescence spectra of porous silicon structures formed in p-type silicon is shown to be related to stresses in the porous material. A characteristic cellular structure, with varying length scale, is observed in the high porosity films due to high surface stresses. The cellular structure is not formed during the secondary open-circuit etching procedure itself but occurs during evaporation of the electrolyte after removal of the porous silicon from the etching solution. C1 USN,RES LAB,WASHINGTON,DC 20375. AT&T BELL LABS,MURRAY HILL,NJ 07974. RP FRIEDERSDORF, LE (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 10 TC 66 Z9 68 U1 0 U2 5 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0003-6951 J9 APPL PHYS LETT JI Appl. Phys. Lett. PD MAY 4 PY 1992 VL 60 IS 18 BP 2285 EP 2287 DI 10.1063/1.107056 PG 3 WC Physics, Applied SC Physics GA HR210 UT WOS:A1992HR21000037 ER PT J AU CHENG, A PRELLER, R AF CHENG, A PRELLER, R TI AN ICE-OCEAN COUPLED MODEL FOR THE NORTHERN-HEMISPHERE SO GEOPHYSICAL RESEARCH LETTERS LA English DT Article ID SEA ICE AB The Polar Ice Prediction System version of the Hibler ice model [Preller and Posey, 1989] has been modified into spherical coordinates and extended to include most of the sea ice-covered areas in the northern hemisphere. The earth-oriented longitudes and latitudes have been transformed into a spherical geometry in which the new "equator" coincides with the 10-degrees-E- 170-degrees-W great circle and the new "north pole " is located at the intersection of the 100-degrees-E meridian and the equator. The coordinate transformation is required to avoid a numerical singularity at the north pole and numerical instabilities in high latitudes. The Cox ocean model [1984] is also transformed into the new coordinate system and coupled with the sea ice model. Monthly atmospheric forcing for 1986 from the Naval Operational Global Atmospheric Prediction System has been used to drive the spherical coordinate version of the ice-ocean coupled model. The estimated ice thickness distribution shows that the thickest ice is located along the northern coasts of Canada, and the ice gradually becomes thinner across the Arctic ocean toward the Soviet coast. The average ice thickness is about 3.5m for March 1986 in the Arctic basin and can vary from open water up to 6m or thicker, depending on location and seasons. The modeled ice edge location is consistent in general with ice data from the Navy-NOAA Joint Ice Center. River runoff is not included in this coupled model and may affect the ice growth in the Yellow Sea and the Baltic Sea in winter. C1 USN,RES LABS,BAY ST LOUIS,MS 39529. RP CHENG, A (reprint author), SVERDRUP TECHNOL INC,BAY ST LOUIS,MS 39529, USA. NR 13 TC 15 Z9 15 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 MAY 4 PY 1992 VL 19 IS 9 BP 901 EP 904 DI 10.1029/92GL00559 PG 4 WC Geosciences, Multidisciplinary SC Geology GA HT894 UT WOS:A1992HT89400015 ER PT J AU SIMPSON, TC HAMPEL, H DAVIS, GD ARAH, CO FRITZ, TL MORAN, PJ SHAW, BA ZANKEL, KL AF SIMPSON, TC HAMPEL, H DAVIS, GD ARAH, CO FRITZ, TL MORAN, PJ SHAW, BA ZANKEL, KL TI EVALUATION OF THE EFFECTS OF ACIDIC DEPOSITION ON COATED STEEL SUBSTRATES SO PROGRESS IN ORGANIC COATINGS LA English DT Review ID ELECTROCHEMICAL IMPEDANCE SPECTROSCOPY; CORROSION; DETERIORATION; DEGRADATION; COATINGS; EXPOSURE; PAINTS; PANELS AB The effects of acidic deposition on painted metal substrates have been investigated using a series of accelerated laboratory exposure test methods. The study examined a commercially available alkyd paint/primer system applied to a low carbon (ASTM A569 CQ) steel substrate exposed under a variety of simulated acidic conditions to determine the micro/macro effects of such exposure. Surface analytical, electrochemical and mechanical test methods were used to characterize the performance/degradation modes of the painted metal coupons. The results of these exposures identified accelerated loss in mechanical properties and discoloration of the paint in the presence of SO2. C1 JOHNS HOPKINS UNIV,BALTIMORE,MD 21218. MARTIN MARIETTA CORP LABS,BALTIMORE,MD 21227. USN ACAD,ANNAPOLIS,MD 21401. PENN STATE UNIV,STATE COLL,UNIV PK,PA 16802. VERSAR INC,COLUMBIA,MD 21045. NR 35 TC 11 Z9 11 U1 0 U2 1 PU ELSEVIER SCIENCE SA LAUSANNE PI LAUSANNE 1 PA PO BOX 564, 1001 LAUSANNE 1, SWITZERLAND SN 0300-9440 J9 PROG ORG COAT JI Prog. Org. Coat. PD MAY 4 PY 1992 VL 20 IS 2 BP 199 EP 216 DI 10.1016/0033-0655(92)80005-H PG 18 WC Chemistry, Applied; Materials Science, Coatings & Films SC Chemistry; Materials Science GA HV417 UT WOS:A1992HV41700005 ER PT J AU VARDIMAN, RG AF VARDIMAN, RG TI MICROSTRUCTURES IN ALUMINUM ION-IMPLANTED WITH BORON AND HEAT-TREATED SO ACTA METALLURGICA ET MATERIALIA LA English DT Article ID WEAR AB Aluminum has been implanted with boron at peak concentrations ranging from 6 to 60 at.%, vacuum heat treated at temperatures between 200 and 525-degrees-C, and characterized by TEM, electron diffraction and Auger sputter profiling. At the lower doses, as implanted damage was very fine scale; an amorphous layer appeared above about 20 at.% boron. On annealing at 200-degrees-C or above, a precipitate formed which was different from the equilibrium AlB2 phase. This all implant concentrations and is stable to at least 525-degrees-C. Its composition is near 60 at.% boron, and the unit cell is rhombohedral with a = 1.104 nm and alpha = 113-degrees. RP VARDIMAN, RG (reprint author), USN, RES LAB, WASHINGTON, DC 20375 USA. NR 7 TC 7 Z9 7 U1 1 U2 3 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLAND SN 0956-7151 J9 ACTA METALL MATER JI Acta Metall. Mater. PD MAY PY 1992 VL 40 IS 5 BP 1029 EP 1035 DI 10.1016/0956-7151(92)90080-X PG 7 WC Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Materials Science; Metallurgy & Metallurgical Engineering GA HP055 UT WOS:A1992HP05500016 ER PT J AU SARVER, N BLACK, RJ BRIDGES, S CHRISEY, L AF SARVER, N BLACK, RJ BRIDGES, S CHRISEY, L TI FRONTIERS IN HIV-1 THERAPY - 4TH CONFERENCE OF THE NIAID NATIONAL COOPERATIVE DRUG DISCOVERY GROUPS-HIV SO AIDS RESEARCH AND HUMAN RETROVIRUSES LA English DT Editorial Material AB This summary describes current studies in antiviral targeting as reported at the Frontiers in HIV Therapy conference, November 3-7, 1991, in San Diego, California. In parallel with the progressive steps in HIV-1 replication, the meeting covered potential antiviral targets starting from the time HIV-1 docks with the CD4 receptor to virus release. The summary concludes with current research trends to block HIV-1 growth. C1 USN,RES LAB,WASHINGTON,DC 20375. RP SARVER, N (reprint author), NIAID,DIV AIDS,BASIC RES & DEV PROGRAM,DEV THERAPEUT BRANCH,BETHESDA,MD 20892, USA. NR 0 TC 12 Z9 12 U1 0 U2 0 PU MARY ANN LIEBERT INC PUBL PI LARCHMONT PA 2 MADISON AVENUE, LARCHMONT, NY 10538 SN 0889-2229 J9 AIDS RES HUM RETROV JI Aids Res. Hum. Retrovir. PD MAY PY 1992 VL 8 IS 5 BP 659 EP 667 DI 10.1089/aid.1992.8.659 PG 9 WC Immunology; Infectious Diseases; Virology SC Immunology; Infectious Diseases; Virology GA JA513 UT WOS:A1992JA51300017 PM 1515217 ER PT J AU STANLEY, SK KESSLER, SW JUSTEMENT, JS SCHNITTMAN, SM GREENHOUSE, JJ BROWN, CC MUSONGELA, L FAUCI, AS AF STANLEY, SK KESSLER, SW JUSTEMENT, JS SCHNITTMAN, SM GREENHOUSE, JJ BROWN, CC MUSONGELA, L FAUCI, AS TI CD34+ BONE-MARROW CELLS ARE INFECTED WITH HIV IN A SUBSET OF SEROPOSITIVE INDIVIDUALS SO AIDS RESEARCH AND HUMAN RETROVIRUSES LA English DT Meeting Abstract C1 NIAID,BETHESDA,MD 20892. USN,MED RES INST,BETHESDA,MD 20814. MAMA YEMO HOSP,KINSHASA,ZAIRE. NR 0 TC 0 Z9 0 U1 0 U2 0 PU MARY ANN LIEBERT INC PUBL PI LARCHMONT PA 2 MADISON AVENUE, LARCHMONT, NY 10538 SN 0889-2229 J9 AIDS RES HUM RETROV JI Aids Res. Hum. Retrovir. PD MAY PY 1992 VL 8 IS 5 BP 917 EP 917 PG 1 WC Immunology; Infectious Diseases; Virology SC Immunology; Infectious Diseases; Virology GA JA513 UT WOS:A1992JA51300249 ER PT J AU RANDALL, DA FORNADLEY, JA KENNEDY, KS AF RANDALL, DA FORNADLEY, JA KENNEDY, KS TI MANAGEMENT OF RECURRENT OTITIS-MEDIA SO AMERICAN FAMILY PHYSICIAN LA English DT Article AB Recurrent otitis media is defined as three or more episodes of acute otitis media in six months or four or more episodes in one year, with the bouts of acute infection separated by intervals of full resolution. The disorder is common in children and is different from otitis media with effusion, the other frequently encountered chronic ear disease. Daily low-dose antibiotic therapy is recommended as initial prophylaxis against recurrent otitis media. Pressure-equalizing tubes may be used in patients who have more than one episode of breakthrough otitis media while receiving antibiotics. Adenoidectomy should be reserved for use when pressure-equalizing tubes fail or when insertion of a second set of tubes is required. RP RANDALL, DA (reprint author), USN HOSP,SAN DIEGO,CA 92134, USA. NR 0 TC 6 Z9 6 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 MAY PY 1992 VL 45 IS 5 BP 2117 EP 2123 PG 7 WC Primary Health Care; Medicine, General & Internal SC General & Internal Medicine GA HU008 UT WOS:A1992HU00800012 PM 1575107 ER PT J AU BARTOSH, RA DUGDALE, TW NIELSEN, R AF BARTOSH, RA DUGDALE, TW NIELSEN, R TI ISOLATED MUSCULOCUTANEOUS NERVE INJURY COMPLICATING CLOSED FRACTURE OF THE CLAVICLE - A CASE-REPORT SO AMERICAN JOURNAL OF SPORTS MEDICINE LA English DT Article C1 USN HOSP,DEPT ORTHOPED & PHYS THERAPY,PORTSMOUTH,VA. NR 0 TC 2 Z9 2 U1 0 U2 0 PU AMER ORTHOPAEDIC SOC SPORT MED PI WALTHAM PA 230 CALVARY STREET, WALTHAM, MA 02154 SN 0363-5465 J9 AM J SPORT MED JI Am. J. Sports Med. PD MAY-JUN PY 1992 VL 20 IS 3 BP 356 EP 359 DI 10.1177/036354659202000321 PG 4 WC Orthopedics; Sport Sciences SC Orthopedics; Sport Sciences GA HV343 UT WOS:A1992HV34300021 PM 1636870 ER PT J AU DAY, FJ AF DAY, FJ TI LARYNGEAL MASK AIRWAY FOR EMERGENCY CASES SO ANESTHESIA AND ANALGESIA LA English DT Letter RP DAY, FJ (reprint author), USN HOSP,PAIN CLIN,8750 MT BLVD,OAKLAND,CA 94627, USA. NR 1 TC 1 Z9 1 U1 0 U2 0 PU WILLIAMS & WILKINS PI BALTIMORE PA 351 WEST CAMDEN ST, BALTIMORE, MD 21201-2436 SN 0003-2999 J9 ANESTH ANALG JI Anesth. Analg. PD MAY PY 1992 VL 74 IS 5 BP 776 EP 776 DI 10.1213/00000539-199205000-00033 PG 1 WC Anesthesiology SC Anesthesiology GA HQ208 UT WOS:A1992HQ20800033 PM 1637392 ER PT J AU CARP, H BAILEY, S AF CARP, H BAILEY, S TI THE ASSOCIATION BETWEEN MENINGITIS AND DURAL PUNCTURE IN BACTEREMIC RATS SO ANESTHESIOLOGY LA English DT Article DE ANESTHETIC TECHNIQUES, SPINAL, BACTEREMIA; COMPLICATIONS, MENINGITIS ID SPINAL-ANESTHESIA AB Clinicians have long been concerned that performance of spinal anesthesia during a period of bacteremia may result in the subsequent development of meningitis. In order to determine whether such an association exists, percutaneous dural puncture was performed in 40 animals during a period of Escherichia coli bacteremia. Twenty-four hours later, spinal fluid was obtained for final analysis by surgically draining the cisterna magna. Twelve animals had E. coli recovered from the surgically drained spinal fluid. Only animals with a circulating bacterial count of at least 50 CFU/ml developed meningitis. Microscopic examination of the brains and spinal cords of animals with infected cerebrospinal fluid showed evidence of central nervous system infection. Bacteremic animals not undergoing percutaneous dural puncture always had sterile spinal fluid (n = 40). Cisternal puncture in the absence of bacteremia did not result in infection (n = 30). Treatment with a single dose of gentamicin before the dural puncture eliminated the risk of meningitis after dural puncture in 30 bacteremic animals. These results demonstrate that dural puncture is associated with the development of meningitis in rats, provided the animals are bacteremic at the time of the puncture. However, antibiotic treatment before the dural puncture appears to eliminate this risk. C1 USN HOSP,DEPT ANESTHESIOL,BETHESDA,MD 20814. RP CARP, H (reprint author), OREGON HLTH SCI UNIV,DEPT ANESTHESIA,3181 SW SAM JACKSON PK RD,PORTLAND,OR 97201, USA. NR 14 TC 47 Z9 48 U1 0 U2 0 PU LIPPINCOTT-RAVEN PUBL PI PHILADELPHIA PA 227 EAST WASHINGTON SQ, PHILADELPHIA, PA 19106 SN 0003-3022 J9 ANESTHESIOLOGY JI Anesthesiology PD MAY PY 1992 VL 76 IS 5 BP 739 EP 742 DI 10.1097/00000542-199205000-00012 PG 4 WC Anesthesiology SC Anesthesiology GA HR032 UT WOS:A1992HR03200012 PM 1575342 ER PT J AU HARKER, LA BERNSTEIN, EF DILLEY, RB SCALA, TE SISE, MJ HYE, RJ OTIS, SM ROBERTS, RS GENT, M AF HARKER, LA BERNSTEIN, EF DILLEY, RB SCALA, TE SISE, MJ HYE, RJ OTIS, SM ROBERTS, RS GENT, M TI FAILURE OF ASPIRIN PLUS DIPYRIDAMOLE TO PREVENT RESTENOSIS AFTER CAROTID ENDARTERECTOMY SO ANNALS OF INTERNAL MEDICINE LA English DT Article DE ASPIRIN; DIPYRIDAMOLE; CAROTID STENOSIS; ENDARTERECTOMY, CAROTID; CORONARY ARTERIOSCLEROSIS ID STENOSIS FOLLOWING ENDARTERECTOMY; MUSCLE CELL-PROLIFERATION; VEIN-GRAFT PATENCY; CORONARY ANGIOPLASTY; RECURRENT STENOSIS; GROWTH-FACTOR; ARTERY; THERAPY; REDUCTION; PATCH AB . Objective: To evaluate therapy with aspirin plus dipyridamole in reducing restenosis after carotid endarterectomy. . Patients: A total of 163 patients having 175 surgical carotid endarterectomies. . Intervention: Eighty-three patients (90 endarterectomies) were randomly assigned to receive oral aspirin, 325 mg, plus dipyridamole, 75 mg, beginning 12 hours preoperatively, followed by a second dose administered within 8 hours after the operation, and given three times daily thereafter for 1 year. Eighty patients (85 endarterectomies) received placebo medication that was identical in appearance to the study drugs. . Measurements: After the adequacy of the surgical procedure was confirmed by intraoperative angiography, restenosis at the endarterectomy sites was evaluated using serial duplex ultrasound studies before hospital discharge and at 3-month intervals postoperatively for 1 year. . Results: Based on the time for developing identifiable restenosis and on efficacy analysis, > 50% restenosis developed in 11 operated vessels (16%) in the treated group and in 10 arteries (14%) in the placebo group, yielding an observed risk increase of 14% (95% Cl, -52% to 167%; P > 0.2). By intention-to-treat analysis, > 50% restenosis developed in 16 of 90 operated vessels in treated patients and in 10 of 85 arteries in patients receiving placebo (26% for the treated group and 12% for the placebo group; P = 0.1 8, Mantel-Haenszel statistic), representing an observed risk increase of 11 0% (Cl, -5% to 365%). Similar differences were observed for > 20% restenosis and for the comparison of patients rather than operated vessels by either intention-to-treat or efficacy analyses. . Conclusions: Because therapy not only failed to reduce carotid restenosis but may have actually increased its frequency, treatment with aspirin plus dipyridamole probably has no clinically important benefit on restenosis in patients having carotid endarterectomy. C1 SCRIPPS CLIN & RES FDN,LA JOLLA,CA 92037. USN HOSP,SAN DIEGO,CA 92134. UNIV CALIF SAN DIEGO,LA JOLLA,CA 92093. MCMASTER UNIV,HAMILTON L8S 4L8,ONTARIO,CANADA. HAMILTON CIVIC HOSP RES CTR,HAMILTON,ONTARIO,CANADA. RP HARKER, LA (reprint author), EMORY UNIV,SCH MED,DIV HEMATOL & ONCOL,PO DRAWER AR,ATLANTA,GA 30322, USA. OI Hye, Robert/0000-0002-7733-6173 NR 40 TC 35 Z9 35 U1 0 U2 0 PU AMER COLL PHYSICIANS PI PHILADELPHIA PA INDEPENDENCE MALL WEST 6TH AND RACE ST, PHILADELPHIA, PA 19106-1572 SN 0003-4819 J9 ANN INTERN MED JI Ann. Intern. Med. PD MAY 1 PY 1992 VL 116 IS 9 BP 731 EP 736 PG 6 WC Medicine, General & Internal SC General & Internal Medicine GA HQ623 UT WOS:A1992HQ62300005 PM 1558344 ER PT J AU EHNI, PD SINGER, IL AF EHNI, PD SINGER, IL TI ELECTRON-BEAM MICROPROBE ANALYSIS OF THE WEAR BEHAVIOR OF SPUTTER-DEPOSITED MOS2 COATINGS SO APPLIED SURFACE SCIENCE LA English DT Article ID LUBRICATION PROPERTIES; FILMS; ARGON AB Michelson interferometry (MI), scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDS), and Auger electron spectroscopy have been combined to study the deformation and wear behavior of sputter-deposited MoS2 coatings. MI combined with EDS were shown to distinguish deformation from wear. EDS combined with Auger sputter depth profiling were especially valuable for identifying reaction products (e.g. oxides of Mo and Fe) of the wear process. EDS data were quantified using a procedure that accounts for the severe overlap of the Mo(L-alpha) + S(K-alpha) spectra. The sensitivity of quantitative EDS to thickness changes in fully dense MoS2 was determined to be 30 nm. C1 USN,RES LAB,CODE 6170,WASHINGTON,DC 20375. NR 21 TC 10 Z9 10 U1 0 U2 5 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0169-4332 J9 APPL SURF SCI JI Appl. Surf. Sci. PD MAY PY 1992 VL 59 IS 1 BP 45 EP 53 DI 10.1016/0169-4332(92)90167-V PG 9 WC Chemistry, Physical; Materials Science, Coatings & Films; Physics, Applied; Physics, Condensed Matter SC Chemistry; Materials Science; Physics GA HW731 UT WOS:A1992HW73100006 ER PT J AU CHARNOCK, DR CHAPMAN, GD TAYLOR, RE WOZNIAK, A AF CHARNOCK, DR CHAPMAN, GD TAYLOR, RE WOZNIAK, A TI RECURRENT TONSILLITIS - THE ROLE OF CHLAMYDIA AND MYCOPLASMA SO ARCHIVES OF OTOLARYNGOLOGY-HEAD & NECK SURGERY LA English DT Article ID MICROBIOLOGY; PHARYNGITIS; TRACHOMATIS; BACTERIA; ADULTS; FLORA AB The core tissue microflora of 40 patients who underwent tonsillectomies were examined with cultures, DNA probe tests, enzyme immunoassays, and direct immunofluorescence antibody tests for Chlamydia and Mycoplasma. We believe this is the largest and most accurate prospective study that has examined the role of Chlamydia and Mycoplasma in the core tonsil tissue of patients with recurrent or chronic tonsillitis. The data strongly indicate that, unlike acute tonsillopharyngitis, Chlamydia and Mycoplasma are not involved in recurrent or chronic tonsillitis. C1 USN HOSP,DEPT OTOLARYNGOL HEAD & NECK SURG,OAKLAND,CA. USN HOSP,DEPT LAB,OAKLAND,CA. LETTERMAN ARMY MED CTR,DEPT PATHOL,SAN FRANCISCO,CA 94129. NR 15 TC 6 Z9 6 U1 0 U2 1 PU AMER MEDICAL ASSOC PI CHICAGO PA 515 N STATE ST, CHICAGO, IL 60610 SN 0886-4470 J9 ARCH OTOLARYNGOL JI Arch. Otolaryngol. Head Neck Surg. PD MAY PY 1992 VL 118 IS 5 BP 507 EP 508 PG 2 WC Otorhinolaryngology; Surgery SC Otorhinolaryngology; Surgery GA HU260 UT WOS:A1992HU26000013 PM 1341878 ER PT J AU DIAZ, DD FREEMAN, SB WILSON, JF PARKER, GS AF DIAZ, DD FREEMAN, SB WILSON, JF PARKER, GS TI HEMATOMA-INDUCED FLAP NECROSIS AND FREE-RADICAL SCAVENGERS SO ARCHIVES OF OTOLARYNGOLOGY-HEAD & NECK SURGERY LA English DT Article ID SKIN FLAP; SUPEROXIDE RADICALS; SURVIVAL; SURGERY AB Skin flap necrosis due to underlying hematoma can be devastating in reconstructive surgery. The production of free radicals in ischemic tissue and cellular damage caused by them have been well established. Deferoxamine, which is both an iron chelator and a free radical scavenger may have a dual benefit in the pharmacologic manipulation of necrosis in a flap jeopardized by hematoma. Past studies showing the importance of free radical scavengers in improving flap survival in hematoma-induced flap necrosis have used the rat model. The porcine model was used for this study because it is the animal model that most closely resembles human skin. A statistically significant benefit of deferoxamine in reducing necrosis of a skin flap induced by hematoma formation was found. Deferoxamine appears to be promising but requires further investigation before it can be optimally used in human applications. C1 USN,DEPT OTOLARYNGOL HEAD & NECK SURG,PORTSMOUTH,VA. RP DIAZ, DD (reprint author), USN,DEPT OTOLARYNGOL HEAD & NECK SURG,CHARLESTON,SC 29408, USA. NR 22 TC 8 Z9 8 U1 0 U2 0 PU AMER MEDICAL ASSOC PI CHICAGO PA 515 N STATE ST, CHICAGO, IL 60610 SN 0886-4470 J9 ARCH OTOLARYNGOL JI Arch. Otolaryngol. Head Neck Surg. PD MAY PY 1992 VL 118 IS 5 BP 516 EP 518 PG 3 WC Otorhinolaryngology; Surgery SC Otorhinolaryngology; Surgery GA HU260 UT WOS:A1992HU26000016 PM 1571126 ER PT J AU MCCOY, RP MEIER, RR KELLER, HU OPAL, CB CARRUTHERS, GR AF MCCOY, RP MEIER, RR KELLER, HU OPAL, CB CARRUTHERS, GR TI THE HYDROGEN COMA OF COMET P-HALLEY OBSERVED IN LYMAN ALPHA USING SOUNDING ROCKETS SO ASTRONOMY & ASTROPHYSICS LA English DT Article DE COMETS; LYMAN ALPHA; HYDROGEN; COMA; WATER ID ULTRAVIOLET; HALLEY; IMAGES; PERIHELION; KOHOUTEK; DENSITY; GAS AB Hydrogen Lyman-alpha (121.6 nm) images of comet P/Halley were obtained using sounding rockets launched from White Sands Missile Range on 24.5 February and 13.5 March 1986. The second rocket was launched 13 hours before the fly-by of the Giotto spacecraft. An electrographic camera on both flights provided Lyman-alpha images covering a 20-degrees field of view with 3' resolution. The data from both flights have been compared with a time-dependent model of hydrogen kinetics. To match the measured isophote contours, hydrogen sources with velocity components of 8 km s-1 and 20 km s-1 (from OH and H2O, respectively) as well as a low velocity component (approximately 2 km s-1), are required. This low velocity component is thought to result from thermalization of fast hydrogen atoms within the collision zone, providing an important diagnostic of temperature and density near the nucleus. Hydrogen production rates of 3.8 10(30) s-1 and 1.7 10(30) s-1 have been obtained for the two observations. C1 MAX PLANCK INST AERON, W-3411 KATLENBURG DUHM, GERMANY. UNIV TEXAS, MCDONALD OBSERV, AUSTIN, TX 78712 USA. RP MCCOY, RP (reprint author), USN, RES LAB, EO HULBURT CTR SPACE RES, CODE 4142, WASHINGTON, DC 20375 USA. RI Meier, Robert/G-4749-2014 OI Meier, Robert/0000-0001-8497-7115 NR 29 TC 10 Z9 10 U1 1 U2 1 PU EDP SCIENCES S A PI LES ULIS CEDEX A PA 17, AVE DU HOGGAR, PA COURTABOEUF, BP 112, F-91944 LES ULIS CEDEX A, FRANCE SN 0004-6361 J9 ASTRON ASTROPHYS JI Astron. Astrophys. PD MAY PY 1992 VL 258 IS 2 BP 555 EP 565 PG 11 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA HV952 UT WOS:A1992HV95200047 ER PT J AU BOWERS, PF AF BOWERS, PF TI LOCATION OF THE DUST FORMATION REGION FOR MIRA VARIABLES SO ASTROPHYSICAL JOURNAL LA English DT Article DE CIRCUMSTELLAR MATTER; MASERS; STARS, VARIABLES, OTHER ID LATE-TYPE STARS; LONG-PERIOD VARIABLES; H2O MASER EMISSION; CIRCUMSTELLAR ENVELOPES; EVOLVED STARS; COOL STARS; U-ORIONIS; GIANT STARS; IR STARS; SIO AB Observations with high spectral sensitivity of 22 GHz H2O masers associated with 15 Mira and semiregular variables have motivated a careful comparison of the maximum velocity ranges V(max) relative to the stellar velocity for various molecular species found in the circumstellar envelopes. From the maser profiles there is little support for the commonly assumed sequence V(max)(SiO) < V(max)(H2O) < V(max)(OH). Instead, values of for the SiO, H2O, and OH masers are nearly identical (7.9 +/- 0.5 km s-1) and almost-equal-to 0.8(CO). These results may suggest that systematic acceleration of the gas can begin inside the outer radius of the SiO shell at a distance less-than-or-equal-to 10 AU from the photosphere. They are consistent with recent infrared results, which indicate the presence of dust within a few stellar radii, and with recent dynamical models for the velocity structure close to the star. C1 USN,RES LAB,CTR ADV SPACE SENSING,WASHINGTON,DC 20375. RP BOWERS, PF (reprint author), SFA INC,1401 MCCORMICK DR,LANDOVER,MD 20785, USA. NR 56 TC 19 Z9 19 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 MAY 1 PY 1992 VL 390 IS 1 BP L27 EP L31 DI 10.1086/186364 PN 2 PG 5 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA HP596 UT WOS:A1992HP59600008 ER PT J AU BASON, R YACAVONE, DW AF BASON, R YACAVONE, DW TI LOSS OF CABIN PRESSURIZATION IN UNITED-STATES NAVAL AIRCRAFT - 1969-90 SO AVIATION SPACE AND ENVIRONMENTAL MEDICINE LA English DT Article ID PRESSURE AB During the 22-year period from 1 January 1969 to 31 December 1990, there were 205 reported cases of loss of cabin pressure in US Naval aircraft; 21 were crew-initiated and 184 were deemed accidental. The ambient altitudes varied from 10,000 ft (3048 m) to 40,000 ft. (12192 m). The most common reason for crew-initiated decompression was to clear smoke and fumes from the cockpit/cabin (95%). The most common cause for accidental loss of cabin pressure was mechanical (73.37%), with aircraft structural damage accounting for the remaining 26.63%. Serious physiological problems included 1 pneumothorax, 11 cases of Type I decompression sickness, 23 cases of mild to moderate hypoxia with no loss of consciousness, 18 cases of hypoxia with loss of consciousness, and 3 lost aircraft with 4 fatalities due to incapacitation by hypoxia. In addition, 12 ejections were attributed to loss of cockpit pressure. Nine of the ejections were deliberate and three were accidental, caused by wind blast activation of the face curtain. Three aviators lost their lives following ejection and seven aircraft were lost. While the incidence of loss of cabin pressure in Naval aircraft appears low, it none-the-less presents a definite risk to the aircrew. Lectures on the loss of cabin/cockpit pressurization should continue during indoctrination and refresher physiology training. C1 USN,CTR SAFETY,NORFOLK,VA 23511. NR 8 TC 4 Z9 4 U1 0 U2 0 PU AEROSPACE MEDICAL ASSOC PI ALEXANDRIA PA 320 S HENRY ST, ALEXANDRIA, VA 22314-3579 SN 0095-6562 J9 AVIAT SPACE ENVIR MD JI Aviat. Space Environ. Med. PD MAY PY 1992 VL 63 IS 5 BP 341 EP 345 PG 5 WC Public, Environmental & Occupational Health; Medicine, General & Internal; Sport Sciences SC Public, Environmental & Occupational Health; General & Internal Medicine; Sport Sciences GA HR212 UT WOS:A1992HR21200001 PM 1599378 ER PT J AU OWASOYO, JO NERI, DF LAMBERTH, JG AF OWASOYO, JO NERI, DF LAMBERTH, JG TI TYROSINE AND ITS POTENTIAL USE AS A COUNTERMEASURE TO PERFORMANCE DECREMENT IN MILITARY SUSTAINED OPERATIONS SO AVIATION SPACE AND ENVIRONMENTAL MEDICINE LA English DT Review ID NEUTRAL AMINO-ACIDS; RAT-BRAIN; CATECHOLAMINE SYNTHESIS; UNCONTROLLABLE STRESS; HYDROXYLASE ACTIVITY; SLEEP-DEPRIVATION; DIETARY TYROSINE; ESCAPE BEHAVIOR; NOREPINEPHRINE; PRECURSOR AB We review the biochemistry and physiological role of the amino acid tyrosine in normal and stressful situations such as military sustained operations. Sustained operations consist of continuous work periods exceeding 12 h and often involve sleep loss and fatigue. These, in turn, can lead to stress, anxiety, mood deterioration, and performance decrement. Experimental data in the literature suggest that tyrosine, a precursor of the neurotransmitter norepinephrine, may be useful in counteracting any stress-related performance decrement and mood deterioration in the following way. First, various forms of stress induce brain depletion of catecholamines, especially norepinephrine, in animals. Second, brain norepinephrine levels are closely related to stress-induced performance decrement in animals. Third, the administration of tyrosine may minimize or reverse stress-induced performance decrement by increasing depleted brain norepinephrine levels. The types of performance degradation expected in military sustained operations and the potential physiological role tyrosine might play in improving mood and performance are discussed. C1 USN,AEROSP MED RES LAB,PENSACOLA,FL 32508. NR 57 TC 29 Z9 31 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 MAY PY 1992 VL 63 IS 5 BP 364 EP 369 PG 6 WC Public, Environmental & Occupational Health; Medicine, General & Internal; Sport Sciences SC Public, Environmental & Occupational Health; General & Internal Medicine; Sport Sciences GA HR212 UT WOS:A1992HR21200006 PM 1599383 ER PT J AU TESTOFF, MA RUDOLPH, AS AF TESTOFF, MA RUDOLPH, AS TI MODIFICATION OF DRY 1,2-DIPALMITOYLPHOSPHATIDYLCHOLINE PHASE-BEHAVIOR WITH SYNTHETIC MEMBRANE-BOUND STABILIZING CARBOHYDRATES SO BIOCONJUGATE CHEMISTRY LA English DT Article ID DIPALMITOYLPHOSPHATIDYLCHOLINE BILAYERS; TREHALOSE; CHOLESTEROL; LIPOSOMES; WATER; PHOSPHATIDYLCHOLINE; CRYOPROTECTANTS; PRESERVATION; DEPENDENCE; STATE AB Carbohydrates, particularly disaccharides, have been shown to accumulate in organisms as protective solutes during periods of stress such as freezing and desiccation. Cholesterol and lipid derivatives containing the protective carbohydrates galactose or maltose, O-[11-(1-beta-D-galactosyloxy)-3,6,9-tri-oxaundecanyl]ol(TEC-GAL), O-[11-(1-beta-D-Maltosyloxy)-3,6,9-trioxaundecanyl]ol (TEC-MAL), and 14-(galactosyloxy)-N-dimethyl-O-(dipalmitoylphosphatidyl)-6,9,12-trioxa-3-azoniatetradecanol (DP-GAL), have been synthesized to investigate the interaction of a protective carbohydrate moiety tethered to the 1,2-dipalmitoylphosphatidylcholine (DPPC) bilayer surface. Toward this goal, we have investigated the calorimetric and infrared spectroscopic behavior of mixtures of DPPC codried with these glycolipids. The synthetic glycolipids are shown to decrease significantly the main transition temperature (max C(p)) of dry DPPC with a concomitant reduction in the cooperativity of the transition, as evidenced by a decrease in the enthalpy with increasing glycolipid. The decrease in transition temperature is shown to be related to chain melting monitored by the CH2 symmetric stretch frequency through the transition using FTIR. We also present evidence that the glycolipids interact with the interfacial region of DPPC, as shown by the decrease in the phosphate symmetric stretch intensity with increasing concentration of glycolipid. These observed effects are similar to the action of bulk protective sugars with DPPC; however, the concentration of glycolipid and the associated carbohydrate concentration needed to effect the observed changes are reduced compared to the quantity of bulk carbohydrate previously shown to give similar results with DPPC. C1 USN,RES LAB,CTR BIOMOLEC SCI & ENGN,CODE 6090,WASHINGTON,DC 20375. NR 35 TC 9 Z9 9 U1 1 U2 4 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 1043-1802 J9 BIOCONJUGATE CHEM JI Bioconjugate Chem. PD MAY-JUN PY 1992 VL 3 IS 3 BP 203 EP 211 DI 10.1021/bc00015a001 PG 9 WC Biochemical Research Methods; Biochemistry & Molecular Biology; Chemistry, Multidisciplinary; Chemistry, Organic SC Biochemistry & Molecular Biology; Chemistry GA HX055 UT WOS:A1992HX05500001 PM 1520723 ER PT J AU MEISENBERG, BR DAVIS, TA MELARAGNO, AJ STEAD, R MONROY, RL AF MEISENBERG, BR DAVIS, TA MELARAGNO, AJ STEAD, R MONROY, RL TI A COMPARISON OF THERAPEUTIC SCHEDULES FOR ADMINISTERING GRANULOCYTE COLONY-STIMULATING FACTOR TO NONHUMAN-PRIMATES AFTER HIGH-DOSE CHEMOTHERAPY SO BLOOD LA English DT Article ID HEMATOPOIETIC REGENERATION; NEUTROPENIA; RECOVERY; 5-FLUOROURACIL; MICE; DOGS C1 USN,MED RES INST,IMMUNE CELL BIOL PROGRAM,BETHESDA,MD 20889. USN,MED RES & DEV COMMAND,BETHESDA,MD 20889. USN HOSP,DIV HEMATOL ONCOL,SAN DIEGO,CA 92134. AMGEN INC,THOUSAND OAKS,CA. NR 17 TC 30 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 0006-4971 J9 BLOOD JI Blood PD MAY 1 PY 1992 VL 79 IS 9 BP 2267 EP 2272 PG 6 WC Hematology SC Hematology GA HW884 UT WOS:A1992HW88400012 PM 1373969 ER PT J AU BIRRER, MJ BROWN, PH AF BIRRER, MJ BROWN, PH TI APPLICATION OF MOLECULAR-GENETICS TO THE EARLY DIAGNOSIS AND SCREENING OF LUNG-CANCER SO CANCER RESEARCH LA English DT Article; Proceedings Paper CT WORKSHOP ON INVESTIGATIONAL STRATEGIES FOR DETECTION AND INTERVENTION IN EARLY LUNG CANCER CY APR 21-24, 1991 CL ANNAPOLIS, MD SP NCI ID GROWTH-FACTOR RECEPTOR; HUMAN SMALL CELL; K-RAS ONCOGENE; POLYMERASE CHAIN-REACTION; HUMAN-BREAST CANCER; NEU ONCOGENE; L-MYC; CARCINOMA-CELLS; PROTO-ONCOGENE; P53 GENE AB Recent studies of the molecular biology of lung cancer have identified multiple abnormalities. Despite this vast cataloging of genetic lesions, the chronology of these events and those which occur early remains essentially unknown. This review summarizes the genetic abnormalities in lung cancer cells, including mutation, amplification, and overexpression of dominant protooncogenes as well as deletion and mutation of recessive oncogenes. In addition, possible candidate genes exist which may participate in the early activation events of lung cancer, and evidence for their role in the early development of cancer is discussed. These lesions may be helpful in developing strategies to screen for lung cancer. C1 NCI,DIV CANC PREVENT & CONTROL,BIOMARKER & PREVENT RES BRANCH,BETHESDA,MD 20892. UNIFORMED SERV UNIV HLTH SCI,USN HOSP,BETHESDA,MD 20814. NR 112 TC 44 Z9 44 U1 0 U2 0 PU AMER ASSOC CANCER RESEARCH PI PHILADELPHIA PA PUBLIC LEDGER BLDG, SUITE 816, 150 S. INDEPENDENCE MALL W., PHILADELPHIA, PA 19106 SN 0008-5472 J9 CANCER RES JI Cancer Res. PD MAY 1 PY 1992 VL 52 IS 9 SU S BP S2658 EP S2664 PG 7 WC Oncology SC Oncology GA HT047 UT WOS:A1992HT04700004 ER PT J AU GIACCONE, G BATTEY, J GAZDAR, AF OIE, H DRAOUI, M MOODY, TW AF GIACCONE, G BATTEY, J GAZDAR, AF OIE, H DRAOUI, M MOODY, TW TI NEUROMEDIN-B IS PRESENT IN LUNG-CANCER CELL-LINES SO CANCER RESEARCH LA English DT Article; Proceedings Paper CT WORKSHOP ON INVESTIGATIONAL STRATEGIES FOR DETECTION AND INTERVENTION IN EARLY LUNG CANCER CY APR 21-24, 1991 CL ANNAPOLIS, MD SP NCI ID GASTRIN-RELEASING PEPTIDE; BOMBESIN-LIKE PEPTIDES; MESSENGER-RNAS; RAT-BRAIN; BIOCHEMICAL-CHARACTERIZATION; GROWTH-FACTORS; SPINAL-CORD; CARCINOMA; GENE; LOCALIZATION AB Previously, high levels of gastrin-releasing peptide and its mRNA were detected in classic small cell lung cancer cell lines. Here the ability of lung cancer cell lines to synthesize neuromedin B (NMB), a structurally similar mammalian bombesin-like peptide, was investigated. By radioimmunoassay, NMB (0.1-0.7 pmol/mg of protein) was detected in 23 of 33 lung cancer cell lines. In contrast, gastrin-releasing peptide (0.1-12.9 pmol/mg of protein) was detected in 16 of 32 cell lines. Using gel filtration and high pressure liquid chromatography techniques, the main peak of immunoreactive NMB coeluted with synthetic NMB. By Northern analysis, a 0.8-kilobase mRNA species was present, using poly(A) mRNA derived from two of three lung cancer cell lines. Using a more sensitive S1 nuclease protection assay, NMB mRNA was present in most of the 15 lung cancer cell lines examined. These data suggest that NMB may be a regulatory peptide in lung cancer. C1 GEORGE WASHINGTON UNIV,MED CTR,DEPT BIOCHEM & MOLEC BIOL,2300 EYE ST NW,WASHINGTON,DC 20037. NCI,USN,MED ONCOL BRANCH,BETHESDA,MD 20889. NINCDS,NEUROCHEM LAB,BETHESDA,MD 20892. RI Giaccone, Giuseppe/E-8297-2017 OI Giaccone, Giuseppe/0000-0002-5023-7562 NR 34 TC 58 Z9 58 U1 0 U2 4 PU AMER ASSOC CANCER RESEARCH PI PHILADELPHIA PA PUBLIC LEDGER BLDG, SUITE 816, 150 S. INDEPENDENCE MALL W., PHILADELPHIA, PA 19106 SN 0008-5472 J9 CANCER RES JI Cancer Res. PD MAY 1 PY 1992 VL 52 IS 9 SU S BP S2732 EP S2736 PG 5 WC Oncology SC Oncology GA HT047 UT WOS:A1992HT04700017 ER PT J AU KAMEL, MN KAMEL, NN AF KAMEL, MN KAMEL, NN TI FEDERATED DATABASE-MANAGEMENT SYSTEM - REQUIREMENTS, ISSUES AND SOLUTIONS SO COMPUTER COMMUNICATIONS LA English DT Article DE DATABASE MANAGEMENT SYSTEMS; FEDERATED DATABASES; TRANSACTION MANAGEMENT; SYSTEM ARCHITECTURE; SCHEMA INTEGRATION AB The use of database management systems (DBMS) to replace conventional file processing systems has dramatically increased in the past years. Although the use of DBMSs overcomes many of the limitations of file processing systems, many important applications require access to and integration of information among several and often incompatible DBMSs. In this paper we discuss an approach, known as the federated database approach, that allows users and applications to access and manipulate data across several heterogeneous databases while maintaining their autonomy. We discuss the requirements and objectives of a federated database management system, and outline the major issues and challenges for building and using such a system. In particular, we address the design issues from three angles: transaction management, system architecture, and schema integration. Also, we present a five-step integration methodology followed by a comprehensive example to illustrate the concepts and techniques involved in this integration methodology. C1 UNIV FLORIDA,DEPT COMP & INFORMAT SCI,GAINESVILLE,FL 32611. RP KAMEL, MN (reprint author), USN,POSTGRAD SCH,DEPT INFORMAT SYST,MONTEREY,CA 93943, USA. NR 17 TC 6 Z9 6 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0140-3664 J9 COMPUT COMMUN JI Comput. Commun. PD MAY PY 1992 VL 15 IS 4 BP 270 EP 278 DI 10.1016/0140-3664(92)90110-Z PG 9 WC Computer Science, Information Systems; Engineering, Electrical & Electronic; Telecommunications SC Computer Science; Engineering; Telecommunications GA HQ145 UT WOS:A1992HQ14500008 ER PT J AU LUSTMAN, L NETA, B GRAGG, W AF LUSTMAN, L NETA, B GRAGG, W TI SOLUTION OF ORDINARY DIFFERENTIAL INITIAL-VALUE PROBLEMS ON AN INTEL HYPERCUBE SO COMPUTERS & MATHEMATICS WITH APPLICATIONS LA English DT Article AB Schemes for the solution of linear initial or boundary value problems on a hypercube were developed by Katti and Neta [1] and tested and improved by Lustman, Neta and Katti [2]. Among other procedures for parallel computers, fully implicit Runge-Kutta methods were discussed by Jackson and Norsett [3] and Lie [4]. Here, we develop a method based on extrapolation to the limit, which is useful even for nonlinear problems. Numerical experiments show excellent accuracy when low order schemes are combined with polynomial extrapolation. RP LUSTMAN, L (reprint author), USN,POSTGRAD SCH,DEPT MATH,MONTEREY,CA 93943, USA. RI Neta, Beny/B-1737-2009 NR 16 TC 12 Z9 12 U1 0 U2 0 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0898-1221 J9 COMPUT MATH APPL JI Comput. Math. Appl. PD MAY PY 1992 VL 23 IS 10 BP 65 EP 72 DI 10.1016/0898-1221(92)90056-N PG 8 WC Mathematics, Applied SC Mathematics GA HK147 UT WOS:A1992HK14700008 ER PT J AU LARUSSA, VF GRIFFIN, JD KESSLER, SW CUTTING, MA KNIGHT, RD BLATTLER, WA LAMBERT, JM WRIGHT, DG AF LARUSSA, VF GRIFFIN, JD KESSLER, SW CUTTING, MA KNIGHT, RD BLATTLER, WA LAMBERT, JM WRIGHT, DG TI EFFECTS OF ANTI-CD33 BLOCKED RICIN IMMUNOTOXIN ON THE CAPACITY OF CD34+ HUMAN MARROW-CELLS TO ESTABLISH INVITRO HEMATOPOIESIS IN LONG-TERM MARROW CULTURES SO EXPERIMENTAL HEMATOLOGY LA English DT Article DE ANTI-CD33 IMMUNOTOXIN; HEMATOPOIESIS; CD34; MARROW TRANSPLANTATION; LONG-TERM MARROW CULTURES ID COLONY-FORMING CELLS; HUMAN-BONE-MARROW; PROGENITOR CELLS; LIMITING DILUTION; PRECURSORS; EXPRESSION; UNIPOTENT; ANTIGEN; MOUSE AB Human marrow cells that express the CD34 antigen but lack CD33 are able to initiate sustained, multilineage in vitro hematopoiesis in long-term Dexter cultures and are believed to include the primitive stem cells responsible for effecting long-term hematopoietic reconstitution in vivo following marrow transplantation. In studies described in this report we investigated the effects of a novel anti-CD33 immunotoxin on the clonogenic potential of normal human CD34+ marrow cells and on the ability of these cells to initiate hematopoiesis in two-stage Dexter cultures (long-term marrow cultures, LTMC). This immunotoxin (anti-CD33-bR), shown previously to kill both clonogenic myelogenous leukemia cells and normal mature myeloid progenitor cells (granulocyte-macrophage colony-forming units, CFU-GM), consists of an anti-CD33 monoclonal antibody conjugated to purified ricin that has been modified by blocking the carbohydrate binding domains of the ricin B-chain to eliminate nonspecific binding. For our studies, normal CD34+ human marrow cells were isolated from the light-density (< 1.070 g/ml) cells of aspirated marrow by positive selection with immunomagnetic beads linked to the monoclonal antibody K6.1. These cell isolates were highly enriched with both multipotential and lineage-restricted clonogenic, hematopoietic progenitors (mixed lineage colony-forming units, CFU-Mix; CFU-GM; and erythroid burst-forming units, BFU-E) which constituted greater-than-or-equal-to 20% of the cells. Recovery of clonogenic progenitors from these CD34+ cell preparations, following treatment with anti-CD33-bR (10 nM), was reduced by greater-than-or-equal-to 85% for CFU-GM and 20%-40% for CFU-Mix and BFU-E. However, the capacity of these cells to initiate hematopoietic LTMC was preserved. Indeed, the production of high proliferative potential (HPP) CFU-GM, BFU-E, and CFU-Mix in cultures seeded with 10(5) anti-CD33-bR-treated CD34+ marrow cells was substantially greater than that observed in LTMC seeded with equivalent numbers of untreated CD34+ cells. Moreover, concentrations of long-term culture initiating cells in CD34+ cell isolates, quantified by a limiting dilution technique, were found to be increased following anti-CD33-bR treatment. These findings support the potential usefulness of anti-CD33-bR for in vitro marrow purging or in vivo treatment to eliminate CD33+ leukemic clones, while sparing normal CD34+/CD33- stem cells that support normal hematopoiesis and hematopoietic reconstitution in vivo. C1 USN,RES INST,IMMUNE CELL BIOL PROGRAM,BETHESDA,MD 20814. IMMUNOGEN INC,CAMBRIDGE,MA. HARVARD UNIV,SCH MED,DANA FARBER CANC INST,DIV TUMOR IMMUNOL,BOSTON,MA 02115. RP LARUSSA, VF (reprint author), WALTER REED ARMY MED CTR,DIV MED,DEPT HEMATOL,WASHINGTON,DC 20307, USA. NR 30 TC 29 Z9 29 U1 0 U2 0 PU CARDEN JENNINGS PUBL CO LTD PI CHARLOTTESVILLE PA BLAKE CTR, STE 200, 1224 W MAIN ST, CHARLOTTESVILLE, VA 22903 SN 0301-472X J9 EXP HEMATOL JI Exp. Hematol. PD MAY PY 1992 VL 20 IS 4 BP 442 EP 448 PG 7 WC Hematology; Medicine, Research & Experimental SC Hematology; Research & Experimental Medicine GA HT028 UT WOS:A1992HT02800013 PM 1373688 ER PT J AU GUTMARK, E BOWMAN, HL SCHADOW, KC AF GUTMARK, E BOWMAN, HL SCHADOW, KC TI FLOW AND ACOUSTIC FEATURES OF A SUPERSONIC TAPERED NOZZLE SO EXPERIMENTS IN FLUIDS LA English DT Article ID JETS AB The acoustic and flow characteristics of a supersonic tapered jet were measured for free and shrouded flow configurations. Measurements were performed for a full range of pressure ratios including over- and underexpanded and design conditions. The supersonic tapered jet is issued from a converging-diverging nozzle with a 3:1 rectangular slotted throat and a conical diverging section leading to a circular exit. The jet was compared to circular and rectangular supersonic jets operating at identical conditions. The distinct feature of the jet is the absence of screech tones in the entire range of operation. Its near-field pressure fluctuations have a wide band spectrum in the entire range of measurements, for Mach numbers of 1 to 2.5, for over- and underexpanded conditions. The free jet's spreading rate is nearly constant and similar to the rectangular jet, and in a shroud, the pressure drop it is inducing is linearly proportional to the primary jet Mach number. This behavior persisted in high adverse pressure gradients at overexpanded conditions, and with nozzle divergence angles of up to 35-degrees, no inside flow separation was observed. RP GUTMARK, E (reprint author), USN,CTR WEAP,RES DEPT,CHINA LAKE,CA 93555, USA. OI Gutmark, Ephraim/0000-0001-7816-4257 NR 25 TC 5 Z9 5 U1 0 U2 0 PU SPRINGER VERLAG PI NEW YORK PA 175 FIFTH AVE, NEW YORK, NY 10010 SN 0723-4864 J9 EXP FLUIDS JI Exp. Fluids PD MAY PY 1992 VL 13 IS 1 BP 49 EP 55 PG 7 WC Engineering, Mechanical; Mechanics SC Engineering; Mechanics GA HV574 UT WOS:A1992HV57400008 ER PT J AU BLEDSOE, PM AF BLEDSOE, PM TI PERFORMANCE AND EVALUATION OF COMMUNICATIVE TASKS - THE VIDEO CAMERA IN THE L2-CLASSROOM SO HISPANIA-A JOURNAL DEVOTED TO THE TEACHING OF SPANISH AND PORTUGUESE LA English DT Article RP BLEDSOE, PM (reprint author), USN ACAD,ANNAPOLIS,MD 21402, USA. NR 4 TC 1 Z9 1 U1 0 U2 0 PU AMER ASSN TEACH SPAN PORTUG PI MISSISSIPPI STATE PA MISSISSIPPI STATE UNIV P O BOX 6349, MISSISSIPPI STATE, MS 39762-6349 SN 0018-2133 J9 HISPANIA-J DEV INTER JI Hispania-J. Devoted Teach. Span. Port. PD MAY PY 1992 VL 75 IS 2 BP 437 EP 440 DI 10.2307/344085 PG 4 WC Linguistics; Language & Linguistics; Literature, Romance SC Linguistics; Literature GA HT891 UT WOS:A1992HT89100068 ER PT J AU BRENNAN, T AF BRENNAN, T TI THE CULTURAL USES OF PRINT IN EARLY-MODERN FRANCE - CHARTIER,R SO HISTOIRE SOCIALE-SOCIAL HISTORY LA English DT Book Review RP BRENNAN, T (reprint author), USN ACAD,ANNAPOLIS,MD 21402, USA. NR 1 TC 0 Z9 0 U1 0 U2 0 PU HISTOIRE SOCIALE DEPT HISTORY PI OTTAWA ONTARIO PA UNIVERSITY OTTAWA, OTTAWA ONTARIO K1N 6N5, CANADA SN 0018-2257 J9 HIST SOC/SOC HIST JI Hist. Soc.-Soc. Hist. PD MAY PY 1992 VL 25 IS 49 BP 172 EP 174 PG 3 WC History SC History GA HV418 UT WOS:A1992HV41800012 ER PT J AU FOUTS, DJ AF FOUTS, DJ TI A GALLIUM-ARSENIDE DIGITAL PHASE-SHIFTER FOR CLOCK AND CONTROL SIGNAL DISTRIBUTION IN HIGH-SPEED DIGITAL-SYSTEMS SO IEEE JOURNAL OF SOLID-STATE CIRCUITS LA English DT Article AB The design, implementation, testing, and applications of a gallium-arsenide digital phase shifter and fan-out buffer are described. The integrated circuit provides a method for adjusting the phase of high-speed clock and control signals in digital systems, without the need for pruning cables, multiplexing between cables of different lengths, delay lines, or similar techniques. The phase of signals distributed with the described chip can be dynamically adjusted in eight different steps of approximately 60 ps per step. The IC also serves as a fan-out buffer and provides 12 in-phase outputs. The chip is useful for distributing high-speed clock and control signals in synchronous digital systems, especially if components are distributed over a large physical area or if there is a large number of components. RP FOUTS, DJ (reprint author), USN,POSTGRAD SCH,MONTEREY,CA 93943, USA. NR 8 TC 1 Z9 1 U1 0 U2 0 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0018-9200 J9 IEEE J SOLID-ST CIRC JI IEEE J. Solid-State Circuit PD MAY PY 1992 VL 27 IS 5 BP 802 EP 809 DI 10.1109/4.133171 PG 8 WC Engineering, Electrical & Electronic SC Engineering GA HP270 UT WOS:A1992HP27000014 ER PT J AU ROBERTSON, RC HA, TT AF ROBERTSON, RC HA, TT TI ERROR PROBABILITIES OF FAST FREQUENCY-HOPPED FSK WITH SELF-NORMALIZATION COMBINING IN A FADING CHANNEL WITH PARTIAL-BAND INTERFERENCE SO IEEE JOURNAL ON SELECTED AREAS IN COMMUNICATIONS LA English DT Article ID SOFT DECISION RECEIVER; JAMMING INTERFERENCE; HOPPING SYSTEM; DIVERSITY; PERFORMANCE AB An error probability analysis is performed for a binary orthogonal frequency-shift-keying (FSK) receiver employing fast frequency-hopped spread-spectrum waveforms transmitted over a frequency-nonselective slowly fading channel with partial-band interference. Diversity is performed using multiple hops per data bit. A nonlinear combination procedure referred to as self-normalization combining is employed by the receiver to minimize partial-band interference effects. Each diversity reception is assumed to fade independently according to a Rician process. The partial-band interference is modeled as a Gaussian process. Thermal noise is also included in the analysis. Diversity is found to completely negate degradation of the self-normalized receiver caused by partial-band interference regardless of the strength of the direct signal component; although, for signals with a large bit energy-to-interference noise density ratio and a very strong direct component, nonlinear combining losses dominate receiver performance and negate any enhancement obtained with diversity if the level of thermal noise is too high. In addition, diversity offers definite receiver performance improvement when the direct signal component is weak. The self-normalized receiver is very sensitive to fading channels, evincing a significant performance degradation as compared with its nonfaded performance. For severe channel fading, the performance of a conventional noncoherent binary FSK receiver with diversity is generally either equivalent or superior to the performance of the self-normalized receiver with the same order of diversity. RP ROBERTSON, RC (reprint author), USN,POSTGRAD SCH,DEPT ELECT & COMP ENGN,CODE EC-RC,MONTEREY,CA 93943, USA. NR 9 TC 20 Z9 22 U1 0 U2 0 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0733-8716 J9 IEEE J SEL AREA COMM JI IEEE J. Sel. Areas Commun. PD MAY PY 1992 VL 10 IS 4 BP 714 EP 723 DI 10.1109/49.136066 PG 10 WC Engineering, Electrical & Electronic; Telecommunications SC Engineering; Telecommunications GA HR464 UT WOS:A1992HR46400007 ER PT J AU ROBERTSON, RC LEE, KY AF ROBERTSON, RC LEE, KY TI PERFORMANCE OF FAST FREQUENCY-HOPPED MFSK RECEIVERS WITH LINEAR AND SELF-NORMALIZATION COMBINING IN A RICIAN FADING CHANNEL WITH PARTIAL-BAND INTERFERENCE SO IEEE JOURNAL ON SELECTED AREAS IN COMMUNICATIONS LA English DT Article ID SOFT DECISION RECEIVER; JAMMING INTERFERENCE; HOPPING SYSTEM; ERROR ANALYSES; DIVERSITY; PROBABILITY AB An error probability analysis is performed for both a self-normalized and conventional M-ary orthogonal frequency-shift-keying (MFSK) noncoherent receiver employing fast frequency-hopped (FFH) spread-spectrum waveforms transmitted over a Rician fading channel with partial-band interference. The partial-band interference is modeled as a Gaussian process. The self-normalization receiver employs a nonlinear combination procedure to minimize performance degradation due to partial-band interference. The performance of the conventional receiver is found to be significantly degraded by worst-case partial-band interference regardless of the modulation order or number of hops per data symbol used for all channel conditions. The self-normalization receiver, on the other hand, can provide a significant immunity to worst-case partial-band interference for many channel conditions when diversity is used, provided the signal-to-thermal noise ratio is large enough to minimize degradation due to nonlinear combining losses. The improvement afforded by higher modulation orders is dependent on channel conditions with a significantly greater improvement obtained for Rician channels as compared with Rayleigh and near-Rayleigh channels. RP ROBERTSON, RC (reprint author), USN,POSTGRAD SCH,DEPT ELECT & COMP ENGN,MONTEREY,CA 93943, USA. NR 9 TC 19 Z9 20 U1 0 U2 0 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0733-8716 J9 IEEE J SEL AREA COMM JI IEEE J. Sel. Areas Commun. PD MAY PY 1992 VL 10 IS 4 BP 731 EP 741 DI 10.1109/49.136068 PG 11 WC Engineering, Electrical & Electronic; Telecommunications SC Engineering; Telecommunications GA HR464 UT WOS:A1992HR46400009 ER PT J AU HILL, PM OLSHANSKY, R BURNS, WK AF HILL, PM OLSHANSKY, R BURNS, WK TI OPTICAL POLARIZATION DIVISION MULTIPLEXING AT 4-GB/S SO IEEE PHOTONICS TECHNOLOGY LETTERS LA English DT Article ID LIGHTWAVE SYSTEMS; TRANSMISSION AB This letter describes an optical polarization multiplexing system using BPSK coherent heterodyne detection to transmit 4 Gb/s over a 45 km standard single-mode fiber optical link at a receiver sensitivity of -35 dBm. C1 USN,RES LAB,WASHINGTON,DC 20375. RP HILL, PM (reprint author), GTE LABS INC,WALTHAM,MA 02254, USA. NR 11 TC 28 Z9 29 U1 0 U2 1 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 1041-1135 J9 IEEE PHOTONIC TECH L JI IEEE Photonics Technol. Lett. PD MAY PY 1992 VL 4 IS 5 BP 500 EP 502 DI 10.1109/68.136500 PG 3 WC Engineering, Electrical & Electronic; Optics; Physics, Applied SC Engineering; Optics; Physics GA HT502 UT WOS:A1992HT50200033 ER PT J AU DAGENAIS, DM KOO, KP DANDRIDGE, A AF DAGENAIS, DM KOO, KP DANDRIDGE, A TI DEMONSTRATION OF LOW-FREQUENCY INTENSITY NOISE-REDUCTION FOR FIBER SENSORS POWERED BY DIODE-PUMPED ND-YAG LASERS SO IEEE PHOTONICS TECHNOLOGY LETTERS LA English DT Article ID PHASE NOISE AB Diode-pumped Nd-YAG lasers are the source of choice for interferometric sensors due to their frequency stability. Unfortunately, low-frequency intensity fluctuations induced by the broad-area laser pump, as well as noise associated with launching light into a single-mode fiber can limit the sensor's minimum detectability. We have measured the low-frequency relative intensity noise (RIN) of these lasers. We implemented a feedback into an external modulator to compensate for both laser and launching noise and obtained a reduced RIN of - 100 dB/square-root Hz at 1 Hz. This is, to our knowledge, the smallest RIN achieved to date for interferometric fiber sensors powered by any laser. C1 SFA INC,LANDOVER,MD 20875. RP DAGENAIS, DM (reprint author), USN,RES LAB,CODE 6570,WASHINGTON,DC 20375, USA. NR 10 TC 2 Z9 3 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 MAY PY 1992 VL 4 IS 5 BP 518 EP 520 PG 3 WC Engineering, Electrical & Electronic; Optics; Physics, Applied SC Engineering; Optics; Physics GA HT502 UT WOS:A1992HT50200040 ER PT J AU KANG, K BAILEY, MP EU, JH AF KANG, K BAILEY, MP EU, JH TI STATISTICAL PROPERTIES OF OUT-OF-FRAME DETECTION SCHEMES FOR DIGITAL TRANSMISSION-SYSTEMS SO IEEE TRANSACTIONS ON COMMUNICATIONS LA English DT Article AB The importance of the misframe times for DS1 frame synchronization has often been addressed in designing and using network elements and mediation units. By extending the work of Eu and Rollins, we use Markov chain first passage time analysis to derive higher moments of the misframe times in both random and burst error environments. This methodology is of great value in evaluating frame synchronization techniques for digital transmission systems. By experimenting with several out-of-frame detection schemes and reasonable values for bit error ratio, we have shown that misframe times are always approximately exponentially distributed for all schemes. C1 USN,POSTGRAD SCH,DEPT OPERAT RES,MONTEREY,CA 93943. NO TELECOM INC,BELL NO RES,DEPT NETWORK OA&M SERV,RES TRIANGLE PK,NC 27709. RP KANG, K (reprint author), USN,POSTGRAD SCH,DEPT ADM SCI,LOGIST GRP,MONTEREY,CA 93943, USA. NR 10 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 0090-6778 J9 IEEE T COMMUN JI IEEE Trans. Commun. PD MAY PY 1992 VL 40 IS 5 BP 980 EP 987 DI 10.1109/26.141463 PG 8 WC Engineering, Electrical & Electronic; Telecommunications SC Engineering; Telecommunications GA HY364 UT WOS:A1992HY36400014 ER PT J AU WEIS, S AF WEIS, S TI VISUALIZATION OF MODAL IRRADIANCE PATTERNS IN AN OPTICAL FIBER SO IEEE TRANSACTIONS ON EDUCATION LA English DT Article AB A laboratory exercise that allows the student to combine theory, numerical computation methods, and experimental observation to learn more about electromagnetic modes and modal patterns is presented. RP WEIS, S (reprint author), USN ACAD,DEPT ELECT ENGN,ANNAPOLIS,MD 21402, USA. NR 5 TC 0 Z9 0 U1 0 U2 0 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0018-9359 J9 IEEE T EDUC JI IEEE Trans. Educ. PD MAY PY 1992 VL 35 IS 2 BP 109 EP 111 DI 10.1109/13.135573 PG 3 WC Education, Scientific Disciplines; Engineering, Electrical & Electronic SC Education & Educational Research; Engineering GA HU436 UT WOS:A1992HU43600003 ER PT J AU TAIT, GB WESTGATE, CR AF TAIT, GB WESTGATE, CR TI HIGH-FREQUENCY SIMULATION OF SEMICONDUCTOR ALLOY RAMP HETEROSTRUCTURES SO IEEE TRANSACTIONS ON ELECTRON DEVICES LA English DT Article ID THERMIONIC EMISSION; DEVICES; DIODES AB A small-signal ac transport description is formulated to characterize the high-frequency operation of unipolar semiconductor heterostructures. The physical transport model combines diffusion-drift currents through compositionally graded regions with a thermionic-emission current imposed at an abrupt material interface. This sinusoidal steady-state analysis can be employed to determine the dynamic terminal admittance of devices at microwave frequencies and cryogenic temperatures. AlxGa1-xAs alloy ramp heterostructures have been fabricated by molecular beam epitaxy and tested over wide ranges of temperature, dc bias, and frequency. Experimentally measured microwave admittances are favorably compared with simulated results at room and liquid-nitrogen temperatures, and are used to verify the theoretical approach. C1 JOHNS HOPKINS UNIV,DEPT ELECT & COMP ENGN,BALTIMORE,MD 21218. RP TAIT, GB (reprint author), USN,RES LAB,DIV ELECTR SCI & TECHNOL,MICROWAVE TECHNOL BRANCH,WASHINGTON,DC 20375, USA. NR 16 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 0018-9383 J9 IEEE T ELECTRON DEV JI IEEE Trans. Electron Devices PD MAY PY 1992 VL 39 IS 5 BP 1063 EP 1069 DI 10.1109/16.129083 PG 7 WC Engineering, Electrical & Electronic; Physics, Applied SC Engineering; Physics GA HP269 UT WOS:A1992HP26900007 ER PT J AU BOULAIS, KA CHOE, JY RHEE, MJ AF BOULAIS, KA CHOE, JY RHEE, MJ TI ANALYSIS FOR AN ELECTRON SOURCE BASED ON MICROCHANNEL PLATE PRINCIPLES SO IEEE TRANSACTIONS ON ELECTRON DEVICES LA English DT Note ID MODEL AB An analysis is carried out for the channel output current density of a microchannel plate constructed from a crystalline semi-conducting bulk. It is shown that the current density can be increased to order 1 A/cm2, which is several orders of magnitude higher than that of conventional microchannel plates, allowing its use for cold cathode applications. C1 UNIV MARYLAND, DEPT ELECT ENGN, COLLEGE PK, MD 20742 USA. RP USN, CTR SURFACE WARFARE, SILVER SPRING, MD 20903 USA. NR 6 TC 0 Z9 0 U1 0 U2 0 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI PISCATAWAY PA 445 HOES LANE, PISCATAWAY, NJ 08855-4141 USA SN 0018-9383 EI 1557-9646 J9 IEEE T ELECTRON DEV JI IEEE Trans. Electron Devices PD MAY PY 1992 VL 39 IS 5 BP 1250 EP 1252 DI 10.1109/16.129118 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied SC Engineering; Physics GA HP269 UT WOS:A1992HP26900041 ER PT J AU BERENDES, T SENGUPTA, SK WELCH, RM WIELICKI, BA NAVAR, M AF BERENDES, T SENGUPTA, SK WELCH, RM WIELICKI, BA NAVAR, M TI CUMULUS CLOUD-BASE HEIGHT ESTIMATION FROM HIGH SPATIAL-RESOLUTION LANDSAT DATA - A HOUGH TRANSFORM APPROACH SO IEEE TRANSACTIONS ON GEOSCIENCE AND REMOTE SENSING LA English DT Article ID SATELLITE DATA; SURFACE AB Cloud base height is an essential variable governing surface energy budgets, but it is notoriously difficult to determine using satellite data. This study develops a semiautomated methodology to estimate cumulus cloud base heights using high spatial resolution LANDSAT Multispectral Scanner data. The approach employs a variety of image processing techniques to match cloud edges with their corresponding shadow edges. Cloud base height then is estimated by computing the separation distance between the corresponding Generalized Hough Transform reference points. Sixteen subregions, each 30 km x 30 km in size, are selected for four LANDSAT scenes. Standard deviations of cloud base height within each of the subregions range from about 100 m to 150 m. Differences between cloud base heights computed using the Hough Transform and a manual verification technique are small (on the order of 100 m or less). The cloud base heights also compare favorably with the few surface observations available. On the basis of these results, it is estimated that cloud base height accuracies of 50-70 m may be possible using HIRIS and ASTER instruments in the EOS Global Climate Change program. C1 LAWRENCE LIVERMORE NATL LAB,LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94551. USN,OCEANOG & ATMOSPHER RES LAB,MONTEREY,CA 93943. NASA,LANGLEY RES CTR,HAMPTON,VA 23665. RP BERENDES, T (reprint author), S DAKOTA SCH MINES & TECHNOL,INST ATMOSPHER SCI,RAPID CITY,SD 57701, USA. NR 24 TC 19 Z9 19 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 0196-2892 J9 IEEE T GEOSCI REMOTE JI IEEE Trans. Geosci. Remote Sensing PD MAY PY 1992 VL 30 IS 3 BP 430 EP 443 DI 10.1109/36.142921 PG 14 WC Geochemistry & Geophysics; Engineering, Electrical & Electronic; Remote Sensing; Imaging Science & Photographic Technology SC Geochemistry & Geophysics; Engineering; Remote Sensing; Imaging Science & Photographic Technology GA JA318 UT WOS:A1992JA31800002 ER PT J AU NYSTUEN, JA GARCIA, FW AF NYSTUEN, JA GARCIA, FW TI SEA ICE CLASSIFICATION USING SAR BACKSCATTER STATISTICS SO IEEE TRANSACTIONS ON GEOSCIENCE AND REMOTE SENSING LA English DT Article AB Sea ice classification accuracy using standard statistics and higher order texture statistics generated from Grey-Level Co-occurrence (GLC) matrices were compared for synthetic aperture radar (SAR) data collected during the Marginal Ice Zone Experiment (MIZEX) in April 1987. Standard stepwise discriminate analysis was used to identify the statistics most useful for the discrimination. Range was the most effective statistic, correctly classifying the ice types 75% of the time. Overall, the standard statistics (mean, variance, range, etc.) outperformed the texture statistics (87% accuracy vs. 75% accuracy). Given the added difficulty and computational cost of generating texture statistics, this result suggests that standard statistics should be used for sea ice classification. Odden and multiyear ice categories were the most difficult to statistically separate for these data. RP NYSTUEN, JA (reprint author), USN,POSTGRAD SCH,DEPT OCEANOG,MONTEREY,CA 93943, USA. NR 15 TC 30 Z9 34 U1 2 U2 2 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0196-2892 J9 IEEE T GEOSCI REMOTE JI IEEE Trans. Geosci. Remote Sensing PD MAY PY 1992 VL 30 IS 3 BP 502 EP 509 DI 10.1109/36.142928 PG 8 WC Geochemistry & Geophysics; Engineering, Electrical & Electronic; Remote Sensing; Imaging Science & Photographic Technology SC Geochemistry & Geophysics; Engineering; Remote Sensing; Imaging Science & Photographic Technology GA JA318 UT WOS:A1992JA31800009 ER PT J AU SKOLNIK, M HEMENWAY, D HANSEN, JP AF SKOLNIK, M HEMENWAY, D HANSEN, JP TI RADAR DETECTION OF GAS SEEPAGE ASSOCIATED WITH OIL AND GAS DEPOSITS SO IEEE TRANSACTIONS ON GEOSCIENCE AND REMOTE SENSING LA English DT Note AB The use of a simple X-band radar for the location of underground oil and natural gas deposits based on detecting the seepage of gas into the atmosphere is discussed. The validity of the original explanation offered by others is questioned and it is suggested that the observed radar echoes may be due to the effect of turbulence induced in the atmosphere by the seeping gases. RP SKOLNIK, M (reprint author), USN,RES LAB,DIV RADAR,WASHINGTON,DC 20375, USA. NR 8 TC 3 Z9 3 U1 0 U2 1 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0196-2892 J9 IEEE T GEOSCI REMOTE JI IEEE Trans. Geosci. Remote Sensing PD MAY PY 1992 VL 30 IS 3 BP 630 EP 633 DI 10.1109/36.142946 PG 4 WC Geochemistry & Geophysics; Engineering, Electrical & Electronic; Remote Sensing; Imaging Science & Photographic Technology SC Geochemistry & Geophysics; Engineering; Remote Sensing; Imaging Science & Photographic Technology GA JA318 UT WOS:A1992JA31800026 ER PT J AU OVERFELT, PL AF OVERFELT, PL TI ON THE REPRESENTATIONAL NONUNIQUENESS OF UNIFORM WAVE-GUIDE EIGENVALUE FORMULAS SO IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES LA English DT Note AB ln the following, we find that for uniform perfectly conducting waveguides characterized by rectilinear boundaries and exact eigenvalue formulas, such formulas are not representationally unique. RP OVERFELT, PL (reprint author), USN,CTR AIR WARFARE,DIV WEAPONS,RES DEPT,CODE 3814,CHINA LAKE,CA 93555, USA. NR 10 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 0018-9480 J9 IEEE T MICROW THEORY JI IEEE Trans. Microw. Theory Tech. PD MAY PY 1992 VL 40 IS 5 BP 1014 EP 1018 DI 10.1109/22.137412 PG 5 WC Engineering, Electrical & Electronic SC Engineering GA HU514 UT WOS:A1992HU51400034 ER PT J AU MUMFORD, ML ANDES, DK KERN, LR AF MUMFORD, ML ANDES, DK KERN, LR TI THE MOD-2 NEUROCOMPUTER SYSTEM-DESIGN SO IEEE TRANSACTIONS ON NEURAL NETWORKS LA English DT Article ID PERCEPTION; COLOR; FORM AB The Mod 2 Neurocomputer, the latest in a series of neurocomputing systems at the Naval Air Warfare Center Weapons Division, is a neural network processing system incorporating individual neural networks as subsystems in a layered hierarchical architecture. The Mod 2 is designed to support parallel processing of image data at sensor (real-time) rates. Basic concepts implemented in the Mod 2 are (1) maintaining data representations as frames of data processed as a whole at each layer, (2) a general interconnect design supporting data transfer requirements such as generation of parallel pathways, fan-up/fan-down, and feedforward and feedback, and (3) a neuroprocessing block supporting several neural network paradigms. The basis for the system implementation is the INTEL 80170NX neural network processor. Examples are given for the implementation strategy for neural substructures such as the multilayer perceptron and temporal and spatiotemporal image processing, as well as the implementation of a multifunction processing system. RP MUMFORD, ML (reprint author), USN,CTR WEAP,CHINA LAKE,CA 93555, USA. NR 17 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 1045-9227 J9 IEEE T NEURAL NETWOR JI IEEE Trans. Neural Netw. PD MAY PY 1992 VL 3 IS 3 BP 423 EP 433 DI 10.1109/72.129415 PG 11 WC Computer Science, Artificial Intelligence; Computer Science, Hardware & Architecture; Computer Science, Theory & Methods; Engineering, Electrical & Electronic SC Computer Science; Engineering GA HN227 UT WOS:A1992HN22700010 PM 18276446 ER PT J AU SCHNEIDEWIND, NF AF SCHNEIDEWIND, NF TI METHODOLOGY FOR VALIDATING SOFTWARE METRICS SO IEEE TRANSACTIONS ON SOFTWARE ENGINEERING LA English DT Article DE METRICS VALIDATION METHODOLOGY; METRICS VALIDATION PROCESS; NONPARAMETRIC STATISTICAL METHODS; QUALITY FUNCTIONS; VALIDITY CRITERIA AB We propose a comprehensive metrics validation methodology that has six validity criteria, which support the quality functions assessment, control, and prediction, where quality functions are activities conducted by software organizations for the purpose of achieving project quality goals. Six criteria are defined and illustrated: association, consistency, discriminative power, tracking, predictability, and repeatability. We show that nonparametric statistical methods such as contingency tables play an important role in evaluating metrics against the validity criteria. Examples emphasizing the discriminative power validity criterion are presented. A metrics validation process is defined that integrates quality factors, metrics, and quality functions. RP SCHNEIDEWIND, NF (reprint author), USN,POSTGRAD SCH,MONTEREY,CA 93943, USA. NR 17 TC 121 Z9 122 U1 0 U2 1 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 MAY PY 1992 VL 18 IS 5 BP 410 EP 422 DI 10.1109/32.135774 PG 13 WC Computer Science, Software Engineering; Engineering, Electrical & Electronic SC Computer Science; Engineering GA HT503 UT WOS:A1992HT50300006 ER PT J AU NEUMANN, S AHITUV, N ZVIRAN, M AF NEUMANN, S AHITUV, N ZVIRAN, M TI A MEASURE FOR DETERMINING THE STRATEGIC RELEVANCE OF IS TO THE ORGANIZATION SO INFORMATION & MANAGEMENT LA English DT Article DE STRATEGIC GRID; STRATEGIC IMPACT; IS POLICY; STRATEGIC PLANNING; IS RELEVANCE TO ORGANIZATION ID COMPETITIVE WEAPON; KEY ISSUES; INFORMATION; SYSTEM AB Several recent studies ranked the strategic planning and policy foundation of information systems as one of the most critical issues facing IS and general management. The IS strategic grid was suggested as a framework to investigate IS importance to the organization: a prerequisite to consideration of IS policy issues. This paper seeks to construct a measure that allows an organization to find its position on the strategic grid by analyzing a small number of measurable organizational and IS variables. The suggested measure is empirically tested by using data from 127 organizations, and its applicability is then demonstrated. C1 TEL AVIV UNIV,FAC MANAGEMENT,IL-69978 TEL AVIV,ISRAEL. USN,SCH POSTGRAD,MONTEREY,CA 93940. NR 40 TC 20 Z9 20 U1 1 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0378-7206 J9 INFORM MANAGE JI Inf. Manage. PD MAY PY 1992 VL 22 IS 5 BP 281 EP 299 PG 19 WC Computer Science, Information Systems; Information Science & Library Science; Management SC Computer Science; Information Science & Library Science; Business & Economics GA JE801 UT WOS:A1992JE80100003 ER PT J AU GOLD, SH FLIFLET, AW AF GOLD, SH FLIFLET, AW TI MULTIMODE SIMULATION OF HIGH-FREQUENCY GYROTRONS SO INTERNATIONAL JOURNAL OF ELECTRONICS LA English DT Article ID MODE COMPETITION; LINEAR-THEORY; OSCILLATORS; FIELD AB This paper presents a simulation study of mode competition in highly overmoded gyrotron cavities. The parameters of the study have been selected to correspond to the approximate design parameters of a 280 GHz, 1 MW gyrotron at the Massachusetts Institute of Technology (MIT). The MIT gyrotron is designed to run in the TE+42,7 mode, using a 50 A, 84 keV electron beam, with a normalized beam radius of 0-6, and a beam alpha of 1.6. This study addresses: (1) the problem of achieving gyrotron operation in the design mode, and at a value of magnetic detuning sufficient to achieve high efficiency operation; and (2) the mode purity of the final state. RP GOLD, SH (reprint author), USN,RES LAB,BEAM PHYS BRANCH,WASHINGTON,DC 20375, USA. NR 17 TC 19 Z9 20 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 MAY-JUN PY 1992 VL 72 IS 5-6 BP 779 EP 794 DI 10.1080/00207219208925614 PG 16 WC Engineering, Electrical & Electronic SC Engineering GA HY347 UT WOS:A1992HY34700007 ER PT J AU HARGREAVES, TA FLIFLET, AW FISCHER, RP BARSANTI, ML MANHEIMER, WM LEVUSH, B ANTONSEN, TM AF HARGREAVES, TA FLIFLET, AW FISCHER, RP BARSANTI, ML MANHEIMER, WM LEVUSH, B ANTONSEN, TM TI TILTED RESONATOR EXPERIMENTS ON A QUASI-OPTICAL GYROTRON SO INTERNATIONAL JOURNAL OF ELECTRONICS LA English DT Article ID QUASI-OPTICAL GYROTRON; VARIABLE MIRROR SEPARATION; SINGLE-MODE OPERATION; HIGH-POWER AB Tilting the resonator axis slightly with respect to the magnetic field axis in the quasioptical gyrotron (QOG) is predicted greatly to enlarge the parameter space available for stable, single-mode operation. Greater interaction efficiency is also predicted for single-mode operation. A resonator with a 2-degrees-tilt has been tested on the QOG experiment at the Naval Research Laboratory. The operation of this resonator has been compared to an untilted, but otherwise identical, resonator. Multimode operation of the two resonators was very similar, in contrast to predictions. However, an output power of 600 kW was produced at an efficiency of 8% and a frequency of 120 GHz. At lower power, efficiencies above 12% were observed. The efficiency of single-mode operation appears to be raised significantly by tilting the resonator axis. C1 BK SYST INC,ROCKVILLE,MD 20850. UNIV MARYLAND,PLASMA RES LAB,COLLEGE PK,MD 20742. SCI APPLICAT INT CORP,MCLEAN,VA 22102. RP HARGREAVES, TA (reprint author), USN,RES LAB,DIV PLASMA PHYS,BEAM PHYS BRANCH,WASHINGTON,DC 20375, USA. RI Antonsen, Thomas/D-8791-2017 OI Antonsen, Thomas/0000-0002-2362-2430 NR 26 TC 6 Z9 6 U1 0 U2 3 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 MAY-JUN PY 1992 VL 72 IS 5-6 BP 807 EP 825 DI 10.1080/00207219208925616 PG 19 WC Engineering, Electrical & Electronic SC Engineering GA HY347 UT WOS:A1992HY34700009 ER PT J AU PARK, GS GRANATSTEIN, VL MCADOO, J ARMSTRONG, CM MCCURDY, AH PARK, SY AF PARK, GS GRANATSTEIN, VL MCADOO, J ARMSTRONG, CM MCCURDY, AH PARK, SY TI PHASE NOISE-REDUCTION IN A GYROKLYSTRON AMPLIFIER SO INTERNATIONAL JOURNAL OF ELECTRONICS LA English DT Article ID LINEAR-ACCELERATOR; DESIGN; POWER AB A fast feedback loop is employed to reduce conventional phase fluctuation in a klystron and a gyroklystron using both proportional and proportional-integral type feedback circuits. Phase fluctuation of less than one degree is achieved in both the klystron and gyroklystron by using a proportional type feedback circuit; in the klystron, 1.8 degrees of phase jitter is reduced to 0.8 degrees and in the gryroklystron 1.9 degrees to 0.9 degrees. These results agree well with theory. A superior phase jitter reduction ratio of approximately 0.3 is demonstrated in both the klystron and gyroklystron by adding an integrating circuit. C1 UNIV MARYLAND,PLASMA RES LAB,COLLEGE PK,MD 20742. USN,RES LAB,WASHINGTON,DC 20375. RI Park, Gunsik/A-1415-2014 NR 21 TC 1 Z9 1 U1 0 U2 1 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 MAY-JUN PY 1992 VL 72 IS 5-6 BP 909 EP 920 DI 10.1080/00207219208925624 PG 12 WC Engineering, Electrical & Electronic SC Engineering GA HY347 UT WOS:A1992HY34700017 ER PT J AU PARK, GS HIRSHFIELD, JL ARMSTRONG, CM AF PARK, GS HIRSHFIELD, JL ARMSTRONG, CM TI PASSIVE GYROTRON CAVITY LOADING AND FREQUENCY-SHIFT SO INTERNATIONAL JOURNAL OF ELECTRONICS LA English DT Article ID 3-CAVITY GYROKLYSTRON AMPLIFIER AB Measurements of change in Q and frequency shift are presented for the penultimate cavity in a 3-cavity gyroklystron under conditions where the cavity does not oscillate. This allowed detailed comparisons to be made with linearized theory, over a wide range of beam currents and DC magnetic fields. The theory was formulated to take into account the effects of cut-off beam tunnels on the effective length of the cavity, the geometrical beam filling factor, the effect of a spread in beam pitch angle, and the effect of the cavity RF magnetic fields. Best fits between the data and the theoretical curves for change in Q and frequency shift were obtained for beam alpha-values in good agreement with those predicted from a modified Herrmannsfeldt code. Calculations of oscillation starting currents for TE01, TE011, TE012, and TE013 rectangular cavities as a function of the cavity detuning parameter show that serious errors can occur if one neglects the cavity RF magnetic fields. C1 OMEGA P INC,YALE STN,NEW HAVEN,CT 06520. RP PARK, GS (reprint author), USN,RES LAB,CODE 6840,WASHINGTON,DC 20375, USA. RI Park, Gunsik/A-1415-2014 NR 14 TC 4 Z9 4 U1 0 U2 1 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 MAY-JUN PY 1992 VL 72 IS 5-6 BP 921 EP 941 DI 10.1080/00207219208925625 PG 21 WC Engineering, Electrical & Electronic SC Engineering GA HY347 UT WOS:A1992HY34700018 ER PT J AU MCCOWAN, RB SULLIVAN, CA GOLD, SH FLIFLET, AW AF MCCOWAN, RB SULLIVAN, CA GOLD, SH FLIFLET, AW TI OBSERVATION OF HARMONIC GYRO-BACKWARD-WAVE OSCILLATION IN A 100 GHZ CARM OSCILLATOR EXPERIMENT SO INTERNATIONAL JOURNAL OF ELECTRONICS LA English DT Article ID CYCLOTRON-RESONANCE MASER; DESIGN AB A cyclotron autoresonance maser (CARM) oscillator experiment is reported, using a 600 keV 200 A electron beam and a whispering-gallery-mode rippled-wall Bragg cavity. This device was designed to produce tens of megawatts of radiation at 100 GHz from a CARM interaction, but instead produced only moderate powers (tens of kilowatts) in fundamental gyrotron modes near 35 GHZ, in third-harmonic gyro-BWO modes and Possibly third-harmonic gyrotron modes, at frequencies near the expected CARM frequency, with no discernable CARM radiation. The lack of observable CARM radiation is attributed to excessive ripple on the voltage waveform and to mode competition. Calculations of the spectrum and growth rate of the backward-wave oscillations are consistent with the experimental observation. C1 USN,RES LAB,DIV PLASMA PHYS,BEAM PHYS BRANCH,WASHINGTON,DC 20375. NR 17 TC 2 Z9 2 U1 0 U2 1 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 MAY-JUN PY 1992 VL 72 IS 5-6 BP 1033 EP 1043 DI 10.1080/00207219208925631 PG 11 WC Engineering, Electrical & Electronic SC Engineering GA HY347 UT WOS:A1992HY34700024 ER PT J AU BLACK, WM GOLD, SH AF BLACK, WM GOLD, SH TI A PHASE-PLATE MODE TRANSDUCER FOR TE1N GYROTRON MODES SO INTERNATIONAL JOURNAL OF ELECTRONICS LA English DT Article ID CIRCULAR WAVEGUIDE; CONVERTERS AB A means is described to increase the on-axis component of the far-field energy pattern of radiation emitted from the open end of a circular waveguide containing a high order TE1n gyrotron mode. While the sidelobe power is higher than that of some other approaches, this technique is relatively broadband and compact, and should be easy to fabricate. The method uses a phase-plate at the output of the waveguide to rectify the negative portion(s) of the electric field of the circular TE mode in the waveguide. C1 GEORGE MASON UNIV,DEPT ELECT & COMP ENGN,FAIRFAX,VA 22030. RP BLACK, WM (reprint author), USN,RES LAB,BEAM PHYS BRANCH,WASHINGTON,DC 20375, USA. NR 11 TC 1 Z9 1 U1 0 U2 0 PU TAYLOR & FRANCIS LTD PI LONDON PA ONE GUNDPOWDER SQUARE, LONDON, ENGLAND EC4A 3DE SN 0020-7217 J9 INT J ELECTRON JI Int. J. Electron. PD MAY-JUN PY 1992 VL 72 IS 5-6 BP 1119 EP 1125 DI 10.1080/00207219208925637 PG 7 WC Engineering, Electrical & Electronic SC Engineering GA HY347 UT WOS:A1992HY34700030 ER PT J AU MANHEIMER, WM AF MANHEIMER, WM TI ON THE POSSIBILITY OF HIGH-POWER GYROTRONS FOR SUPER RANGE RESOLUTION RADAR AND ATMOSPHERIC SENSING SO INTERNATIONAL JOURNAL OF ELECTRONICS LA English DT Article ID QUASI-OPTICAL GYROTRON; DOPPLER RADAR; 94 GHZ; CYCLOTRON FREQUENCY; OPERATION; MODE; EFFICIENCY; HARMONICS; CAVITY AB High power gyrotrons have been developed recently; this makes a number of high power millimeter wave oscillators available. Currently their main application is the heating of fusion plasmas. This examines other potential applications for these RF sources. If used in multipulse radar mode, the pulses may be somewhat different from each other and this must be considered. A variant of coherent-on-receive data processing can be used. With this, the entire pulse, not only the phase, is renormalized to a reference pulse. The data are analysed off line. Possible applications of the quasi-optical gyrotron in a radar mode include exploiting its wide tuning range to achieve super range resolution and also remotely sensing the distribution of the size of ice crystals in cirrus clouds. Possible applications of a fixed frequency (94 GHz) gyrotron in the radar mode include studying the structure of clouds. In a forward scatter mode, these high power sources could provide the capability to remotely sense the structure of clear air turbulence. The tunability of the quasi-optical gyrotron could also be exploited to perform rapid path average measurements of relative humidity on the ground and in clouds, and to perform two way earth-to-space measurements of upper atmosphere trace element concentrations. RP MANHEIMER, WM (reprint author), USN,RES LAB,CODE 4707,WASHINGTON,DC 20375, USA. NR 48 TC 15 Z9 15 U1 0 U2 2 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 MAY-JUN PY 1992 VL 72 IS 5-6 BP 1165 EP 1189 DI 10.1080/00207219208925642 PG 25 WC Engineering, Electrical & Electronic SC Engineering GA HY347 UT WOS:A1992HY34700035 ER PT J AU JOHNSON, DK HOWARD, RM ILACQUA, PN AF JOHNSON, DK HOWARD, RM ILACQUA, PN TI DATA-ANALYSIS FOR UNSTEADY TURBULENCE MEASUREMENTS OVER AIRFOILS SO JOURNAL OF AIRCRAFT LA English DT Article AB Studies of unsteady flows about pitching airfoils and flows with unsteady freestream components require a consistent method of nonstationary data analysis for proper characterization of unsteady turbulent behavior. A method has been developed for data analysis of flows composed of high-frequency turbulence fluctuations superimposed upon a time-dependent low-frequency component or ensemble-averaged mean velocity with the goal of establishing a consistent method for the presentation of results from varying tests and flow situations. A nonstationary mean was determined by ensemble-averaging and frequency-domain low-pass filtering. Turbulence intensities were calculated based on a local mean using frequency-domain low-pass filtering methods. A nonstationary power spectral density estimator was developed to estimate the time-varying spectral characteristics of a turbulent boundary layer subjected to an unsteady freestream disturbance. A discussion concerning the choice of cutoff frequencies and digital filters is included. C1 USN,POSTGRAD SCH,DEPT MATH,MONTEREY,CA 93943. NR 0 TC 1 Z9 1 U1 0 U2 1 PU AMER INST AERONAUT ASTRONAUT PI RESTON PA 1801 ALEXANDER BELL DRIVE, STE 500, RESTON, VA 22091 SN 0021-8669 J9 J AIRCRAFT JI J. Aircr. PD MAY-JUN PY 1992 VL 29 IS 3 BP 308 EP 313 DI 10.2514/3.46162 PG 6 WC Engineering, Aerospace SC Engineering GA HX252 UT WOS:A1992HX25200004 ER PT J AU WELCH, RM SENGUPTA, SK GOROCH, AK RABINDRA, P RANGARAJ, N NAVAR, MS AF WELCH, RM SENGUPTA, SK GOROCH, AK RABINDRA, P RANGARAJ, N NAVAR, MS TI POLAR CLOUD AND SURFACE CLASSIFICATION USING AVHRR IMAGERY - AN INTERCOMPARISON OF METHODS SO JOURNAL OF APPLIED METEOROLOGY LA English DT Article ID RESOLUTION TEXTURAL FEATURES; SPATIAL-RESOLUTION; PATTERN-RECOGNITION; NEURAL NETWORKS; ARCTIC OCEAN; CLIMATE; REGIONS; COVER AB Six Advanced Very High-Resolution Radiometer local area coverage (AVHRR LAC) arctic scenes are classified into ten classes. These include water, solid sea ice, broken sea ice, snow-covered mountains, snow-free land, and five cloud types. Three different classifiers are examined: 1) the traditional stepwise discriminant analysis (SDA) method; 2) the feed-forward back-propagation (FFBP) neural network; and 3) the probabilistic neural network (PNN). More than 200 spectral and textural measures are computed. These are reduced to 20 features using sequential forward selection. Theoretical accuracy of the classifiers is determined using the bootstrap approach. Overall accuracy is 85.6%, 87.6%, and 87.0% for the SDA, FFBP, and PNN classifiers, respectively, with standard deviations of approximately 1%. Thin cloud/fog over ice is the class with the lowest accuracy (almost-equal-to 75%) for all of the classifiers. The snow-covered mountains, the cirrus over ice, and the land classes are classified with the highest accuracy (greater-than-or-equal-to 90%) by all of the classifiers. C1 USN,OCEANOG & ATMOSPHER RES LAB,MONTEREY,CA 93940. S DAKOTA SCH MINES & TECHNOL,DEPT MATH & COMP SCI,RAPID CITY,SD 57701. NR 35 TC 82 Z9 91 U1 1 U2 1 PU AMER METEOROLOGICAL SOC PI BOSTON PA 45 BEACON ST, BOSTON, MA 02108-3693 SN 0894-8763 J9 J APPL METEOROL JI J. Appl. Meteorol. PD MAY PY 1992 VL 31 IS 5 BP 405 EP 420 DI 10.1175/1520-0450(1992)031<0405:PCASCU>2.0.CO;2 PG 16 WC Meteorology & Atmospheric Sciences SC Meteorology & Atmospheric Sciences GA HV478 UT WOS:A1992HV47800001 ER PT J AU MESSENGER, SR WALTERS, RJ SUMMERS, GP AF MESSENGER, SR WALTERS, RJ SUMMERS, GP TI EFFECT OF CARRIER CONCENTRATION ON THE PROPERTIES OF IRRADIATION-INDUCED DEFECTS IN P-TYPE INDIUM-PHOSPHIDE GROWN BY METALORGANIC CHEMICAL VAPOR-DEPOSITION SO JOURNAL OF APPLIED PHYSICS LA English DT Article ID RECOMBINATION-ENHANCEMENT THEORIES; DEEP-CENTER REACTIONS; RADIATION-DAMAGE; SOLAR-CELLS; INP; TRAPS; SEMICONDUCTORS; EMISSION; ENERGY AB Deep-level transient spectroscopy has been used to monitor the effect of carrier concentration on the properties of radiation-induced defects in InP n+p mesa diodes grown by metalorganic chemical vapor deposition. The activation energy E(a) for hole emission from H4 and H5 centers and the injection-enhanced annealing rate of H4 at 200 K have been measured as a function of carrier concentration N(A) over the range approximately 1 x 10(16) - 4 x 10(17) cm-3. The measured values of E(a) decrease with increasing N(A) in a way that can be semi-quantitatively explained by a combination of the Frenkel-Poole effect and phonon-assisted tunneling produced by the electric field in the junction. The results suggest that hole emission from H4 and H5 centers takes place to maxima in different valence bands. The injection-enhanced annealing rate of H4 centers increases with increasing N(A) at low concentrations, but approaches a maximum value near N(A) approximately 10(17) cm-3, indicating a limiting dopant (Zn) concentration for impurity-enhanced defect annealing. C1 USN,RES LAB,WASHINGTON,DC 20375. UNIV MARYLAND,DEPT PHYS,CATONSVILLE,MD 21228. RP MESSENGER, SR (reprint author), SFA INC,LANDOVER,MD 20785, USA. NR 30 TC 9 Z9 9 U1 0 U2 0 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0021-8979 J9 J APPL PHYS JI J. Appl. Phys. PD MAY 1 PY 1992 VL 71 IS 9 BP 4201 EP 4207 DI 10.1063/1.351386 PG 7 WC Physics, Applied SC Physics GA HR455 UT WOS:A1992HR45500015 ER PT J AU ANCONA, MG SAKS, NS AF ANCONA, MG SAKS, NS TI NUMERICAL-SIMULATION OF 3-LEVEL CHARGE PUMPING SO JOURNAL OF APPLIED PHYSICS LA English DT Article ID MOSFETS; TRAPS AB The 3-level charge-pumping technique for characterizing electron and hole capture cross sections of fast interface traps in metal-oxide-semiconductor devices is studied via quasistatic one-dimensional numerical simulation. In general, these simulations confirm our understanding of the operation of the 3-level technique for carrier capture and emission. The simulations show that the previously developed simplified analysis of 3-level charge pumping is reasonably accurate in the emission regime. In contrast, previous simple analysis of the capture regime is found to be in error. For quantitatively accurate results, the effect of the trapped charge on band bending must be included. A revised analytical approach for the capture regime is developed which corrects this error. RP ANCONA, MG (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 15 TC 20 Z9 21 U1 0 U2 2 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0021-8979 J9 J APPL PHYS JI J. Appl. Phys. PD MAY 1 PY 1992 VL 71 IS 9 BP 4415 EP 4421 DI 10.1063/1.350781 PG 7 WC Physics, Applied SC Physics GA HR455 UT WOS:A1992HR45500047 ER PT J AU KOCH, WH CEBULA, TA FOSTER, PL EISENSTADT, E AF KOCH, WH CEBULA, TA FOSTER, PL EISENSTADT, E TI UV MUTAGENESIS IN SALMONELLA-TYPHIMURIUM IS UMUDC DEPENDENT DESPITE THE PRESENCE OF SAMAB SO JOURNAL OF BACTERIOLOGY LA English DT Article ID ESCHERICHIA-COLI; SEQUENCE-ANALYSIS; SOS MUTAGENESIS; GENE; MUTATION; CLEAVAGE; PLASMID; OPERON; RECA; LT2 AB We investigated the role of the umuDC and samAB operons in the UV mutability of Salmonella typhimurium. umuDC is located on the chromosome, whereas samAB resides on the virulence plasmid pSLT. Using allele replacement and plasmid curing techniques, we found that UV mutability was eliminated when any of three different umuDC alleles (umuD1, umuC1, or umuD1 umuC1) were on the chromosome even when samAB was present. We conclude that samAB normally does not complement umuDC function in S. typhimurium. C1 OFF NAVAL RES,DIV BIOL SCI,800 N QUINCY ST,ARLINGTON,VA 22217. US FDA,MOLEC BIOL BRANCH,WASHINGTON,DC 20204. BOSTON UNIV,SCH PUBL HLTH,DIV ENVIRONM HLTH,BOSTON,MA 02118. OI Foster, Patricia/0000-0002-7236-4378 FU NCI NIH HHS [CA37880] NR 44 TC 23 Z9 23 U1 0 U2 1 PU AMER SOC MICROBIOLOGY PI WASHINGTON PA 1325 MASSACHUSETTS AVENUE, NW, WASHINGTON, DC 20005-4171 SN 0021-9193 J9 J BACTERIOL JI J. Bacteriol. PD MAY PY 1992 VL 174 IS 9 BP 2809 EP 2815 PG 7 WC Microbiology SC Microbiology GA HR231 UT WOS:A1992HR23100010 PM 1569012 ER PT J AU KOUBEK, E STEWART, AE AF KOUBEK, E STEWART, AE TI THE ANALYSIS OF SULFUR IN COAL - AN ION CHROMATOGRAPHY EXPERIMENT SO JOURNAL OF CHEMICAL EDUCATION LA English DT Article RP KOUBEK, E (reprint author), USN ACAD,ANNAPOLIS,MD 21402, USA. NR 6 TC 6 Z9 6 U1 0 U2 1 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 MAY PY 1992 VL 69 IS 5 BP A146 EP A148 PG 3 WC Chemistry, Multidisciplinary; Education, Scientific Disciplines SC Chemistry; Education & Educational Research GA HW422 UT WOS:A1992HW42200001 ER PT J AU DUNN, JH LAMBRAKOS, SG MOORE, PG NAGUMO, M AF DUNN, JH LAMBRAKOS, SG MOORE, PG NAGUMO, M TI AN ALGORITHM FOR CALCULATING INTRAMOLECULAR ANGLE-DEPENDENT FORCES ON VECTOR COMPUTERS SO JOURNAL OF COMPUTATIONAL PHYSICS LA English DT Article RP DUNN, JH (reprint author), USN,RES LAB,CODE 5842,WASHINGTON,DC 20375, USA. NR 9 TC 1 Z9 1 U1 0 U2 3 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 MAY PY 1992 VL 100 IS 1 BP 17 EP 24 DI 10.1016/0021-9991(92)90306-J PG 8 WC Computer Science, Interdisciplinary Applications; Physics, Mathematical SC Computer Science; Physics GA HV236 UT WOS:A1992HV23600002 ER PT J AU BURKHART, GR CHEN, J AF BURKHART, GR CHEN, J TI CHAOTIC SCATTERING OF PITCH ANGLES IN THE CURRENT SHEET OF THE MAGNETOTAIL SO JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS LA English DT Article ID RECONNECTION FIELD GEOMETRY; PLASMA SHEET; GEOMAGNETIC TAIL; PARTICLE DYNAMICS; ION DISTRIBUTIONS; MAGNETIC-FIELD; BOUNDARY-LAYER; NEUTRAL LINE; MOTION; MODEL AB The process of pitch angle scattering by a current sheet is studied using the modified Harris field model. The relationship between the incoming asymptotic pitch angle-alpha(in) and the outgoing asymptotic pitch angle-alpha(out) is studied from first principles by numerically integrating the equation of motion. We give evidence that charged particles undergo chaotic scattering by the current sheet. For fixed alpha(in), it is shown that alpha(out), exhibits sensitive dependence on the energy parameter H in certain energy ranges. For fixed H in the same energy ranges, alpha(out) sensitively depends on alpha(in). For other energy values, alpha(out) does not show sensitive dependence on alpha(in) for most phase angles. The latter energy values occur at the resonance values given by the previously identified relationship H1/4 approximately N + 0.6. Thus alpha(out) exhibits no significant sensitivity near these resonance energies. This conclusion applies to a range of alpha(in) centered at alpha(in) = 0 (i.e., field aligned in the asymptotic region). A distribution of alpha(in) is mapped from the asymptotic region to the midplane, and it is found that the resulting particle distribution should have beam structures with well-collimated pitch angles near each resonance energy value. Implications for the particle distribution functions in the Earth's magnetotail are discussed. C1 USN,RES LAB,DIV PLASMA PHYS,BEAM PHYS BRANCH,WASHINGTON,DC 20375. NR 45 TC 16 Z9 16 U1 0 U2 0 PU AMER GEOPHYSICAL UNION PI WASHINGTON PA 2000 FLORIDA AVE NW, WASHINGTON, DC 20009 SN 0148-0227 J9 J GEOPHYS RES JI J. Geophys. Res-Space Phys. PD MAY 1 PY 1992 VL 97 IS A5 BP 6479 EP 6491 DI 10.1029/91JA03020 PG 13 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA HT743 UT WOS:A1992HT74300023 ER PT J AU PALMADESSO, PJ GANGULI, G AF PALMADESSO, PJ GANGULI, G TI EFFECTS OF PLASMA TURBULENCE ON ELECTRON COLLECTION BY A HIGH-VOLTAGE SPHERICAL PROBE IN A MAGNETIZED PLASMA SO JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS LA English DT Article ID LANGMUIR PROBES; FIELD; SHEATH AB We study the effects of electron trapping and plasma turbulence on the current-voltage relation for a positively charged high-voltage spherical probe in a magnetized plasma. In a force field consisting of an attractive radial electric field and a uniform magnetic field, the electric field provides a potential well in which electrons can be bound if they have insufficient energy to escape and cannot be captured by the sphere (by virtue of angular momentum conservation and/or the effects of the magnetic field). Electrons entering such a well from infinity may become trapped if they lose energy as a result of some scattering process acting within the well, such as inelastic collisions with neutral atoms or wave-particle interactions due to plasma collective effects. When the neutral density is low enough so that ionization can be ignored, our results indicate that the sheath structure and the current-voltage relation of a charged sphere configured as in the originally planned SPEAR I experiment (with an operating plasma contactor) would be substantially influenced by the combined action of trapped electrons and plasma instabilities. Our method is a modification of Linson's (1969) method in which potential contours are taken to be elliptical rather than cylindrical, space charge is not assumed to be constant within the sheath, and the controlling parameter is a scattering rate. We find reduced levels of current collection relative to Linson's model. Further, variation of the scattering parameter over the whole range of physically realizable values results in a range of predicted current collection values which is a small fraction of the interval between the Parker-Murphy and Langmuir-Blodgett limits. C1 USN,RES LAB,DIV PLASMA PHYS,SPACE PLASMA PHYS BRANCH,WASHINGTON,DC 20375. RP PALMADESSO, PJ (reprint author), USN,RES LAB,SPECIAL PROJECT NONLINEAR SCI,CODE 4700-3,4555 OVERLOOK AVE SW,WASHINGTON,DC 20375, USA. NR 14 TC 3 Z9 3 U1 0 U2 0 PU AMER GEOPHYSICAL UNION PI WASHINGTON PA 2000 FLORIDA AVE NW, WASHINGTON, DC 20009 SN 0148-0227 J9 J GEOPHYS RES JI J. Geophys. Res-Space Phys. PD MAY 1 PY 1992 VL 97 IS A5 BP 6493 EP 6504 DI 10.1029/91JA03048 PG 12 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA HT743 UT WOS:A1992HT74300024 ER PT J AU CHEN, YH PIONTEK, ED AF CHEN, YH PIONTEK, ED TI DECENTRALIZED ADAPTIVE ROBUST-CONTROL AND ITS APPLICATIONS TO AN UNCERTAIN FLEXIBLE BEAM SO JOURNAL OF GUIDANCE CONTROL AND DYNAMICS LA English DT Article ID SYSTEMS AB We consider a class of nonlinear uncertain interconnected systems with time-varying uncertainty. The uncertainty may arise within each system as well as in the interconnections. The uncertainty is assumed to be bounded but the bound is unknown. No a priori statistical information is imposed. Decentralized adaptive robust control is proposed for each system. The control has two parts. First, an adaptive scheme for the estimation of the bound is constructed. Second, a robust control, which is based on the adaptive parameter, is adopted for each system. The control is then applied to an uncertain flexible beam. C1 USN,CTR AIR TEST,PATUXENT RIVER,MD 20670. GEORGIA INST TECHNOL,INTELLIGENT CONTROL SYST LAB,ATLANTA,GA 30332. SYRACUSE UNIV,DEPT MECH & AEROSP ENGN,SYRACUSE,NY 13244. RP CHEN, YH (reprint author), GEORGIA INST TECHNOL,SCH MECH ENGN,ATLANTA,GA 30332, USA. NR 27 TC 3 Z9 6 U1 1 U2 2 PU AMER INST AERONAUT ASTRONAUT PI RESTON PA 1801 ALEXANDER BELL DRIVE, STE 500, RESTON, VA 22091 SN 0731-5090 J9 J GUID CONTROL DYNAM JI J. Guid. Control Dyn. PD MAY-JUN PY 1992 VL 15 IS 3 BP 692 EP 699 DI 10.2514/3.20893 PG 8 WC Engineering, Aerospace; Instruments & Instrumentation SC Engineering; Instruments & Instrumentation GA HU736 UT WOS:A1992HU73600020 ER PT J AU SATHE, SB JOSHI, Y AF SATHE, SB JOSHI, Y TI NATURAL-CONVECTION LIQUID COOLING OF A SUBSTRATE-MOUNTED PROTRUSION IN A SQUARE ENCLOSURE - A PARAMETRIC STUDY SO JOURNAL OF HEAT TRANSFER-TRANSACTIONS OF THE ASME LA English DT Article DE CONJUGATE HEAT TRANSFER; ELECTRONIC EQUIPMENT; NATURAL CONVECTION ID HEAT-TRANSFER AB The coupled conduction and natural convection transport from a substrate-mounted heat generating protrusion in a liquid-filled square enclosure is numerically examined. The governing steady two-dimensional equations are solved using a finite-difference method for a wide range of Rayleigh numbers, protrusion thermal conductivities and widths, substrate heights, and enclosure boundary conditions. The results presented apply to liquids with 10 less-than-or-equal-to Pr less-than-or-equal-to 1000. It was established that in many situations it may be inappropriate to specify simple boundary conditions on the solid surface and decouple the conduction within the substrate or the protrusion. Higher Rayleigh numbers, protrusion thermal conductivities, and widths enhanced cooling. A variation in the substrate height did not affect the maximum protrusion temperature, however, the flow behavior was considerably altered. An empirical correlation for the maximum protrusion temperature was developed for a wide range of parametric values. The enclosure thermal boundary conditions changed the heat transfer in the solid region to only a small extent. Immersion cooling in common dielectric liquids was shown to be advantageous over air cooling only if the thermal conductivity of the protrusion was larger than that of the liquid. C1 USN,POSTGRAD SCH,DEPT MECH ENGN,MONTEREY,CA 93943. RP SATHE, SB (reprint author), IBM CORP,ENDICOTT,NY 13760, USA. NR 19 TC 26 Z9 26 U1 0 U2 2 PU ASME-AMER SOC MECHANICAL ENG PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 SN 0022-1481 J9 J HEAT TRANS-T ASME JI J. Heat Transf.-Trans. ASME PD MAY PY 1992 VL 114 IS 2 BP 401 EP 409 DI 10.1115/1.2911288 PG 9 WC Thermodynamics; Engineering, Mechanical SC Thermodynamics; Engineering GA HW623 UT WOS:A1992HW62300014 ER PT J AU MARTO, PJ ANDERSON, CL AF MARTO, PJ ANDERSON, CL TI NUCLEATE BOILING CHARACTERISTICS OF R-113 IN A SMALL TUBE BUNDLE SO JOURNAL OF HEAT TRANSFER-TRANSACTIONS OF THE ASME LA English DT Article DE BOILING; MULTIPHASE FLOWS; REFRIGERATION ID HEAT-TRANSFER; HORIZONTAL TUBE; CROSS-FLOW AB Heat transfer measurements were made during nucleate boiling of R-113 from a bundle of 15 electrically heated, smooth copper tubes arranged in an equilateral triangular pitch. The bundle was designed to simulate a portion of a refrigeration system flooded-tube evaporator. The outside diameter of the tubes was 15.9 mm, and the tube pitch was 19.1 mm. Five of the tubes that were oriented in a vertical array on the centerline of the bundle were each instrumented with six wall thermocouples to obtain an average wall temperature and a resultant average heat transfer coefficient. All tests were performed at atmospheric pressure. The majority of the data were obtained with increasing heat flux to study the onset of nucleate boiling and the influence of surface "history " upon boiling heat transfer. Data taken during increasing heat flux showed that incipient boiling was dependent upon the number of tubes in operation. The operation of lower tubes in the bundle decreased the incipient boiling heat flux and wall superheat of the upper tubes, and generally increased the boiling heat transfer coefficients of the upper tubes at low heat fluxes where natural convection effects are important. The boiling data confirmed that the average heat transfer coefficient for a smooth-tube bundle is larger than obtained for a single tube. RP MARTO, PJ (reprint author), USN,POSTGRAD SCH,DEPT MECH ENGN,MONTEREY,CA 93943, USA. NR 39 TC 19 Z9 19 U1 1 U2 3 PU ASME-AMER SOC MECHANICAL ENG PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 SN 0022-1481 J9 J HEAT TRANS-T ASME JI J. Heat Transf.-Trans. ASME PD MAY PY 1992 VL 114 IS 2 BP 425 EP 433 DI 10.1115/1.2911291 PG 9 WC Thermodynamics; Engineering, Mechanical SC Thermodynamics; Engineering GA HW623 UT WOS:A1992HW62300017 ER PT J AU STEELE, JK DOMINGO, R GOMI, H ISHIZAKA, K AF STEELE, JK DOMINGO, R GOMI, H ISHIZAKA, K TI SEROLOGIC, BIOLOGIC AND WESTERN-BLOT-ANALYSIS OF HUMAN IGE-BINDING FACTOR DERIVED FROM A T-CELL HYBRIDOMA MAINTAINED IN PROTEIN-FREE MEDIUM SO JOURNAL OF IMMUNOLOGY LA English DT Article ID HUMAN-LYMPHOCYTES; RAT LYMPHOCYTES; SERUM IGE; INFECTION AB The human T cell hybridoma AC5 has been shown to produce an IgE-binding factor (IgEBF) upon stimulation with T cell mitogens, or anti-CD3 antibody. In this study, the line was established, propagated long term in a newly available serum-free, protein-free medium, and the factor it produced was analyzed. Serologic analysis, utilizing an ELISA assay and biotin-labeled human Ig of various isotypes, revealed that the IgEBF thus obtained was highly specific for the Ig epsilon-chain and was released primarily within the first 24 h after mitogen stimulation. Using biotin-labeled IgE as the detecting reagent, Western blot analysis of this factor demonstrated that the molecule was a single chain moiety of m.w. 64,000, and could be purified to apparent homogeneity by either DEAE or affinity (IgE column) chromatography. Detection of the IgEBF by ELISA and Western blot correlated well with activity in the previously employed rosette inhibition assay. Finally, purified IgEBF was found to suppress in vitro the production of IgE in the monoclonal human myeloma line U266, but not IgA or IgM-producing myelomas, providing evidence for the direct and specific regulatory action of this molecule on IgE-producing cells. C1 USN HOSP,DEPT PATHOL,EXPTL PATHOL BRANCH,SAN DIEGO,CA 92134. LA JOLLA INST ALLERGY & IMMUNOL,LA JOLLA,CA 92037. RP STEELE, JK (reprint author), SCRIPPS CLIN & RES FDN,DEPT PATHOL,M5-213,10666 N TORREY PINES RD,LA JOLLA,CA 92037, USA. FU NCI NIH HHS [CA 27489]; NIAID NIH HHS [AI07007, AI-11202] NR 26 TC 1 Z9 1 U1 0 U2 1 PU AMER ASSOC IMMUNOLOGISTS PI BETHESDA PA 9650 ROCKVILLE PIKE, BETHESDA, MD 20814 SN 0022-1767 J9 J IMMUNOL JI J. Immunol. PD MAY 1 PY 1992 VL 148 IS 9 BP 2834 EP 2839 PG 6 WC Immunology SC Immunology GA HQ182 UT WOS:A1992HQ18200024 PM 1573271 ER PT J AU ANASTASSIOU, ED PALIOGIANNI, F BALOW, JP YAMADA, H BOUMPAS, DT AF ANASTASSIOU, ED PALIOGIANNI, F BALOW, JP YAMADA, H BOUMPAS, DT TI PROSTAGLANDIN-E2 AND OTHER CYCLIC AMP-ELEVATING AGENTS MODULATE IL-2 AND IL-2R-ALPHA GENE-EXPRESSION AT MULTIPLE LEVELS SO JOURNAL OF IMMUNOLOGY LA English DT Article ID CELL ANTIGEN RECEPTOR; LYMPHOCYTE-T ACTIVATION; PROTEIN KINASE-C; TYROSINE PHOSPHORYLATION; SIGNAL TRANSDUCTION; MESSENGER-RNA; INOSITOL PHOSPHATES; MEDIATED ACTIVATION; HUMAN INTERLEUKIN-2; CD2 PATHWAY AB cAMP is an intracellular second messenger that conveys inhibitory signals for T cell activation and clonal proliferation. cAMP also inhibits the production of IL-2 and IL-2R alpha-chain expression. To determine the mechanisms of this inhibition, human peripheral blood T lymphocytes were stimulated with anti-CD3 mAb, PHA, PMA, or ionomycin, alone or in combination. cAMP elevation by PGE2, cholera toxin, or the cell-permeable analogue 8-bromo-cAMP inhibited the tyrosine phosphorylation of a protein of 100 kDa. This inhibition was associated with decreased IL-2 production and IL-2R-alpha expression at both the protein product and the mRNA levels. Nuclear run-off assays showed that the inhibitory effect of cAMP on IL-2 and IL-2R-alpha-gene expression is mediated at the transcriptional level. H-8, an inhibitor of protein kinase A, reversed the inhibitory effect of cAMP on nuclear transcription of the IL-2 gene, suggesting that this is mediated through activation of protein kinase A. Post-transcriptionally, cAMP elevation decreased the t1/2 Of IL-2 mRNA by more than 50%. These data indicate that cAMP inhibits cell membrane, cytoplasmic, and nuclear events associated with T cell activation and highlight the complexities of its action of lymphocyte function. C1 NIDDKD,KIDNEY DIS SECT,BLDG 10,ROOM 3N114,BETHESDA,MD 20892. UNIV PATRAS,SCH MED,DEPT MICROBIOL,GR-26110 PATRAS,GREECE. USN,MED RES INST,IMMUN & CELL BIOL PROGRAM,BETHESDA,MD 20889. NR 52 TC 205 Z9 206 U1 0 U2 4 PU AMER ASSOC IMMUNOLOGISTS PI BETHESDA PA 9650 ROCKVILLE PIKE, BETHESDA, MD 20814 SN 0022-1767 J9 J IMMUNOL JI J. Immunol. PD MAY 1 PY 1992 VL 148 IS 9 BP 2845 EP 2852 PG 8 WC Immunology SC Immunology GA HQ182 UT WOS:A1992HQ18200026 PM 1374102 ER PT J AU BROWN, GD AF BROWN, GD TI BANDWIDTH AND RISE TIME CALCULATIONS FOR DIGITAL MULTIMODE FIBEROPTIC DATA LINKS SO JOURNAL OF LIGHTWAVE TECHNOLOGY LA English DT Article AB The use of multimode fiber in digital fiber-optic data links requires simple and accurate procedures for the calculation of data link component bandwidth and rise time responses. This paper investigates source/fiber/detector interactions to develop a simple model for multimode fiber system information capacity. Simplified expressions for the baseband impulse and frequency responses of each component are given along with relationships between the theoretical impulse response root mean square (RMS) width and the component rise time or bandwidth. The application of the Central Limit Theorem to the system yields expressions for the composite system rise time and bandwidth which contains correction factors to those that would be obtained using the normal Gaussian assumptions. RP BROWN, GD (reprint author), USN,CTR SURFACE WARFARE,FIBER OPT GRP,DAHLGREEN,VA 22449, USA. NR 12 TC 15 Z9 17 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 0733-8724 J9 J LIGHTWAVE TECHNOL JI J. Lightwave Technol. PD MAY PY 1992 VL 10 IS 5 BP 672 EP 678 DI 10.1109/50.136103 PG 7 WC Engineering, Electrical & Electronic; Optics; Telecommunications SC Engineering; Optics; Telecommunications GA HU282 UT WOS:A1992HU28200021 ER PT J AU CERIO, FM WEIMER, WA JOHNSON, CE AF CERIO, FM WEIMER, WA JOHNSON, CE TI DIAMOND GROWTH USING CARBON-MONOXIDE AS A CARBON SOURCE SO JOURNAL OF MATERIALS RESEARCH LA English DT Article ID CHEMICAL VAPOR-DEPOSITION; MICROWAVE PLASMA CVD; METHANE HYDROGEN; LOW-PRESSURE; FILMS; OXYGEN; TEMPERATURE; ACETYLENE; MECHANISM; METHYL AB Polycrystalline diamond films were produced in a microwave plasma assisted CVD reactor using CO as the carbon source gas. Reactor exhaust gas compositions were determined by mass spectrometry using 2-10% CO and 0-1.5% O2 in H2 feed gas mixtures. The chemistry involved in the gas phase is similar to that which occurs when diamond is grown using hydrocarbons as carbon source gases. A chemical mechanism for the oxidation of CH4 in flames appears to be applicable to this system. Addition of O2 to the reactor feed gas results in increased growth rates for low addition levels possibly due to activation of the diamond surface, while lower growth rates result at high addition levels due to oxidation of carbon from the surface and depletion of diamond growth precursors in the gas phase. The chemical reactions that take place in the plasma are similar to those that occur in flames and hot filament reactors, indicating that the plasma acts to induce reactions that are normally associated with high temperature combustion processes. C1 USN,CTR WEAP,RES DEPT,DIV CHEM,CHINA LAKE,CA 93555. NR 39 TC 14 Z9 14 U1 0 U2 3 PU MATERIALS RESEARCH SOCIETY PI PITTSBURGH PA 9800 MC KNIGHT ROAD SUITE 327, PITTSBURGH, PA 15237 SN 0884-2914 J9 J MATER RES JI J. Mater. Res. PD MAY PY 1992 VL 7 IS 5 BP 1195 EP 1203 DI 10.1557/JMR.1992.1195 PG 9 WC Materials Science, Multidisciplinary SC Materials Science GA HT106 UT WOS:A1992HT10600021 ER PT J AU JEWELL, JM AGGARWAL, ID AF JEWELL, JM AGGARWAL, ID TI THERMAL LENSING IN HEAVY-METAL FLUORIDE GLASSES SO JOURNAL OF NON-CRYSTALLINE SOLIDS LA English DT Article ID OPTICAL DISTORTION; WINDOWS AB The effect of glass composition on the theoretical thermal lensing of a ZrF4-BaF2-LaF3-AlF3 NaF (ZBLAN) heavy metal fluoride glasses (HMF) has been examined. A number of composition substitutions, i.e., HfF4 for ZrF4, PbF2 for BaF2, and LiF and NaCl for NaF, have been made, and the effects of these substitutions on critical properties have been determined. These substitutions have significant effects on the refractive index, coefficient of thermal expansion (CTE), and the thermo-optic coefficient (dn/dT). The changes in properties can be used to develop glass compositions that will show no thermal lensing when heated by laser fluences. The elimination of thermal lensing by composition changes is evaluated in terms of changes in heat capacity, glass stability and processing parameters that might be detrimental to large scale window production. RP JEWELL, JM (reprint author), USN,RES LAB,DIV OPT SCI,OPT MAT RES GRP,CODE 6505,WASHINGTON,DC 20375, USA. NR 27 TC 24 Z9 24 U1 1 U2 8 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 MAY PY 1992 VL 142 IS 3 BP 260 EP 268 DI 10.1016/S0022-3093(05)80032-8 PG 9 WC Materials Science, Ceramics; Materials Science, Multidisciplinary SC Materials Science GA HX643 UT WOS:A1992HX64300008 ER PT J AU THOMAS, K AF THOMAS, K TI OVERVIEW OF CONFLICT AND CONFLICT-MANAGEMENT SO JOURNAL OF ORGANIZATIONAL BEHAVIOR LA English DT Editorial Material RP THOMAS, K (reprint author), USN,POSTGRAD SCH,DEPT ADM SCI,MONTEREY,CA 93943, USA. NR 1 TC 4 Z9 4 U1 0 U2 11 PU JOHN WILEY & SONS LTD PI W SUSSEX PA BAFFINS LANE CHICHESTER, W SUSSEX, ENGLAND PO19 1UD SN 0894-3796 J9 J ORGAN BEHAV JI J. Organ. Behav. PD MAY PY 1992 VL 13 IS 3 BP 263 EP 264 DI 10.1002/job.4030130306 PG 2 WC Business; Psychology, Applied; Management SC Business & Economics; Psychology GA HX079 UT WOS:A1992HX07900005 ER PT J AU THOMAS, KW AF THOMAS, KW TI CONFLICT AND CONFLICT-MANAGEMENT - REFLECTIONS AND UPDATE SO JOURNAL OF ORGANIZATIONAL BEHAVIOR LA English DT Article ID MODEL RP THOMAS, KW (reprint author), USN,POSTGRAD SCH,DEPT ADM SCI,MONTEREY,CA 93943, USA. NR 47 TC 114 Z9 116 U1 4 U2 45 PU JOHN WILEY & SONS LTD PI W SUSSEX PA BAFFINS LANE CHICHESTER, W SUSSEX, ENGLAND PO19 1UD SN 0894-3796 J9 J ORGAN BEHAV JI J. Organ. Behav. PD MAY PY 1992 VL 13 IS 3 BP 265 EP 274 DI 10.1002/job.4030130307 PG 10 WC Business; Psychology, Applied; Management SC Business & Economics; Psychology GA HX079 UT WOS:A1992HX07900006 ER PT J AU HARRIS, RJ AF HARRIS, RJ TI THE CONNECTIVE-TISSUE AND PARTIAL THICKNESS DOUBLE PEDICLE GRAFT - A PREDICTABLE METHOD OF OBTAINING ROOT COVERAGE SO JOURNAL OF PERIODONTOLOGY LA English DT Article DE TOOTH ROOT; PERIODONTAL DISEASES; SURGERY AB OBTAINING PREDICTABLE ROOT COVERAGE has been a goal of periodontal therapy for some time. The purpose of this study is to present a technique for obtaining root coverage. This study reports the results of 20 patients (30 defects) treated with a connective tissue and partial thickness double pedicle graft. Root coverage of 100% was obtained in 24 of 30 defects, or 80% of the time. In all the treated defects the root coverage obtained was to within 0.5 mm of the cemento-enamel junction. The mean percent root coverage was 97.4%. The mean amount of exposed root surface initially was 3.6 mm. At the final postoperative appointment the mean exposed root surface was 0.1 mm. This change represents a net root coverage of 3.5 mm or 97.2%. The number of sites with bleeding on probing and plaque present decreased. The esthetics, both color match and tissue contours, were acceptable to all the patients in all cases. With this technique root coverage can be accomplished in a predictable manner. C1 USN,DENT CLIN,DEPT PERIODONT,ORLANDO,FL. NR 11 TC 159 Z9 166 U1 1 U2 6 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 MAY PY 1992 VL 63 IS 5 BP 477 EP 486 PG 10 WC Dentistry, Oral Surgery & Medicine SC Dentistry, Oral Surgery & Medicine GA HU332 UT WOS:A1992HU33200012 PM 1527693 ER PT J AU WALTON, JH MILLER, JB ROLAND, CM AF WALTON, JH MILLER, JB ROLAND, CM TI XE-129 NMR AS A PROBE OF POLYMER BLENDS SO JOURNAL OF POLYMER SCIENCE PART B-POLYMER PHYSICS LA English DT Article DE NUCLEAR MAGNETIC RESONANCE (NMR) WITH XE-129 AS PROBE OF POLYMER BLENDS; BLENDS, XE-129 AS NMR PROBE OF; RUBBERY POLYMER BLENDS, XE-129 AS NMR PROBE OF ID NUCLEAR-MAGNETIC-RESONANCE; CHEMICAL-SHIFT; LOW-TEMPERATURE; CHLORINATED POLYMERS; DENSITY DEPENDENCE; SOLID POLYMERS; Y-ZEOLITES; XENON; MISCIBILITY; GASES AB The miscibility of two-component polymer blends has been investigated using xenon-129 (Xe-129) nuclear magnetic resonance (NMR) to probe the phase morphology. The chemical shift of Xe-129 dissolved in a given polymer is unique, thus heterogeneous blends with large domain sizes exhibit two Xe-129 NMR lines. When a single resonance is obtained, the data are consistent with miscibility, yielding an upper bound on the domain size. The temperature dependence of the relative solubilities and chemical shifts of Xe-129 dissolved in the pure components may allow a determination of the phase morphology in blends exhibiting a single resonance. The method is used to demonstrate that polychloroprene and 25% epoxidized 1,4-polyisoprene form a miscible blend. C1 USN,RES LAB,DIV CHEM,WASHINGTON,DC 20375. RP WALTON, JH (reprint author), FLORIDA STATE UNIV,DEPT CHEM,TALLAHASSEE,FL 32306, USA. NR 42 TC 37 Z9 37 U1 0 U2 9 PU JOHN WILEY & SONS INC PI NEW YORK PA 605 THIRD AVE, NEW YORK, NY 10158-0012 SN 0887-6266 J9 J POLYM SCI POL PHYS JI J. Polym. Sci. Pt. B-Polym. Phys. PD MAY PY 1992 VL 30 IS 6 BP 527 EP 532 DI 10.1002/polb.1992.090300602 PG 6 WC Polymer Science SC Polymer Science GA HN863 UT WOS:A1992HN86300002 ER PT J AU BAKER, PJ MELLOR, AM COFFEY, CS AF BAKER, PJ MELLOR, AM COFFEY, CS TI CRITICAL IMPACT INITIATION ENERGIES FOR 3 HTPB PROPELLANTS SO JOURNAL OF PROPULSION AND POWER LA English DT Article; Proceedings Paper CT 26TH JOINT PROPULSION CONF CY JUL 10-18, 1990 CL ORLANDO, FL SP AMER INST AERONAUT & ASTRONAUT, SOC AUTOMOT ENGINEERS, AMER SOC MECH ENGINEERS, AMER SOC ENGN EDUC ID COMPOSITE; ROCKET AB The instrumented drop weight impact machine is one possible candidate for establishing the hazard response of solid rocket propellants to impact. The plastic work done on the propellant prior to initiation can be measured by equating it to the loss in drop weight kinetic energy, provided energy storage in the machine is negligible. Three HTPB/AP propellants were studied with an instrumented impact machine. Data are given for impact velocities ranging from 5.54 m/s, at which no sample was consumed, to 16.14 m/s, at which nearly all of the sample was consumed. These data are interpreted in terms of a proposed mechanism based on other impact tests. On bare steel tools ignition, as opposed to hot spot formation, is assumed to occur at impact velocities greater than 10.3 m/s, when more than 90% of the sample is consumed during the test. At higher impact velocities, for the present data, times to reaction are short and the change in impactor kinetic energy during the initiation delay is defined as the critical initiation energy. Some of the trends in the data are correlated with the propellant formulations. The present test is contrasted with others suggested for impact sensitivity characterization in terms of both initiation threshold and response severity. C1 USN,CTR SURFACE WARFARE,DETONAT PHYS BRANCH,SILVER SPRING,MD 20903. RP BAKER, PJ (reprint author), VANDERBILT UNIV,DEPT MECH ENGN,NASHVILLE,TN 37235, USA. NR 22 TC 7 Z9 7 U1 0 U2 4 PU AMER INST AERONAUT ASTRONAUT PI RESTON PA 1801 ALEXANDER BELL DRIVE, STE 500, RESTON, VA 22091 SN 0748-4658 J9 J PROPUL POWER JI J. Propul. Power PD MAY-JUN PY 1992 VL 8 IS 3 BP 578 EP 585 DI 10.2514/3.23517 PG 8 WC Engineering, Aerospace SC Engineering GA HU330 UT WOS:A1992HU33000009 ER PT J AU CAMPBELL, WH KO, BN LOWE, SR NETZER, DW AF CAMPBELL, WH KO, BN LOWE, SR NETZER, DW TI SOLID-FUEL RAMJET FUEL REGRESSION RATE THRUST MODULATION SO JOURNAL OF PROPULSION AND POWER LA English DT Article ID COMBUSTION AB An experimental investigation was conducted to determine if inlet air swirl and/or secondary gaseous injection could be used effectively for fuel regression rate control or thrust modulation in a solid-fuel ramjet. Inlet swirl characteristics were measured in nonreacting flows. Tests were conducted at high and low air mass fluxes using three fuel compositions with equivalence ratios between 0.5 and 1.8. Swirl introduced downstream of the air inlet was found to be effective for obtaining limited increases in the fuel regression rate, but the magnitude was highly dependent upon motor geometry. Swirl interactions with the reattaching inlet flow and/or significantly increased near-wall mixing were found to be detrimental to efficient combustion. Energetic gaseous fuels (H-2, C2H4) can be easily injected and efficiently burned under fuel-lean conditions to significantly enhance thrust. RP CAMPBELL, WH (reprint author), USN,POSTGRAD SCH,DEPT AERONAUT & ASTRONAUT,MONTEREY,CA 93943, USA. NR 16 TC 3 Z9 3 U1 0 U2 0 PU AMER INST AERONAUT ASTRONAUT PI RESTON PA 1801 ALEXANDER BELL DRIVE, STE 500, RESTON, VA 22091 SN 0748-4658 J9 J PROPUL POWER JI J. Propul. Power PD MAY-JUN PY 1992 VL 8 IS 3 BP 624 EP 629 DI 10.2514/3.23524 PG 6 WC Engineering, Aerospace SC Engineering GA HU330 UT WOS:A1992HU33000016 ER PT J AU LEE, TH NETZER, DW AF LEE, TH NETZER, DW TI TEMPERATURE EFFECTS ON SOLID-FUEL RAMJET FUEL PROPERTIES AND COMBUSTION SO JOURNAL OF PROPULSION AND POWER LA English DT Note RP LEE, TH (reprint author), USN,POSTGRAD SCH,DEPT AERONAUT & ASTRONAUT,MONTEREY,CA 93943, USA. NR 5 TC 3 Z9 3 U1 0 U2 0 PU AMER INST AERONAUT ASTRONAUT PI RESTON PA 1801 ALEXANDER BELL DRIVE, STE 500, RESTON, VA 22091 SN 0748-4658 J9 J PROPUL POWER JI J. Propul. Power PD MAY-JUN PY 1992 VL 8 IS 3 BP 721 EP 723 DI 10.2514/3.23539 PG 3 WC Engineering, Aerospace SC Engineering GA HU330 UT WOS:A1992HU33000031 ER PT J AU LOTH, E KAILASANATH, K LOHNER, R AF LOTH, E KAILASANATH, K LOHNER, R TI SUPERSONIC-FLOW OVER AN AXISYMMETRICAL BACKWARD-FACING STEP SO JOURNAL OF SPACECRAFT AND ROCKETS LA English DT Article ID BASE-PRESSURE; EQUATIONS AB Large eddy numerical simulations of supersonic flows over an axisymmetric backward-facing step have been completed using a recently developed axisymmetric version of the finite element method-flux corrected transport algorithm, FEM-FCT. The code is based on the mixing layer and recompression premises of the Chapman-Korst model. It solves the time-accurate Euler equations utilizing 1) adaptive unstructured gridding to resolve flow feature details and 2) a conservative nonlinear scheme to capture features in the compressible flowfield. This approach may be employed since the location of the separation point is fixed at the sharp corner. The simulation allows the large-scale structures present in the mixing layer to interact dynamically with the recompression region. Comparisons have been made with available experimental data for a range of Mach numbers and step height to step radius ratios for which boundary-layer effects are not pronounced. In general, good agreement between predictions and measurements was found for 1) the time-averaged surface pressure distributions along the backstep and the reattachment wall, 2) the flowfield structure in general, and 3) the downstream reattachment lengths. Effects of axisymmetry were noted in flowfield characteristics such as increased base pressure, curvature of expansion fans, stronger recompression shocks, and higher Mach number levels in the subsonic recirculating region. C1 GEORGE WASHINGTON UNIV,SCH ENGN & APPL SCI,WASHINGTON,DC 20052. USN,RES LAB,CTR REACT FLOW & DYNAM SYST,COMPUTAT PHYS & FLUID DYNAM LAB,WASHINGTON,DC 20375. RP LOTH, E (reprint author), UNIV ILLINOIS,DEPT AERONAUT & ASTRONAUT ENGN,URBANA,IL 61801, USA. RI Loth, Eric/C-5805-2008 NR 40 TC 14 Z9 14 U1 1 U2 5 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 MAY-JUN PY 1992 VL 29 IS 3 BP 352 EP 359 DI 10.2514/3.26358 PG 8 WC Engineering, Aerospace SC Engineering GA HZ095 UT WOS:A1992HZ09500008 ER PT J AU GAUNAURD, GC WERTMAN, WH AF GAUNAURD, GC WERTMAN, WH TI ASYMPTOTIC AND NUMERICAL DETERMINATIONS OF THE COMPLEX EIGENFREQUENCIES AND THE REAL RESONANCES OF AN ACOUSTICALLY INSONIFIED SPHERE SO JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA LA English DT Article ID ELASTIC SPHERE; FREQUENCY POLES; SCATTERING; CYLINDER; TARGETS AB Various aspects of the scattering problem associated with the incidence of a plane sound wave on a sphere are studied. Various tables are numerically generated that exhibit the external eigenfrequencies of acoustically rigid, soft, and elastic spheres, as well as the related (electromagnetic) TM and TE modes of perfectly conducting spheres. Also generated are tables of the (complex) "composition" zeros of an elastic sphere in water and they are compared to the (real) physical natural resonances of this target. Some of these tables cover new expanded frequency ranges, and in some instances either correct some of our previous misprints/typos or are totally novel. An acoustical analog of the Bohr-Sommerfeld quantization rule of (the old) quantum theory is used to asymptotically evaluate the external eigenfrequencies of the sphere. The resonance condition that emerges from this phase-matching principle is identical to the asymptotic expansion for the (complex) zeros of the spherical Hankel functions found by Olver in the fifties. This yields an asymptotic determination of the external eigenfrequencies of a sphere. This paper concludes with a study of the asymptotic spacings between consecutive shape-dependent zeros of the sphere, where a uniform value for one of these spacings is obtained (i.e., the one that results when the index n is kept fixed), which agrees with earlier numerical calculations of "background" curves. The zeros in these tables, which are analyzed here, are essential for the characterization of scatterers and for the solution of target identification problems. They are also indispensable for the determination of the dispersion plots for the phase (and group) velocities and attenuations of the surface waves that revolve around scatterers of any shape, and all these applications are described. RP GAUNAURD, GC (reprint author), USN,CTR SURFACE WARFARE,WHITE OAK,SILVER SPRING,MD 20903, USA. NR 30 TC 3 Z9 3 U1 0 U2 1 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0001-4966 J9 J ACOUST SOC AM JI J. Acoust. Soc. Am. PD MAY PY 1992 VL 91 IS 5 BP 2489 EP 2501 DI 10.1121/1.402985 PG 13 WC Acoustics; Audiology & Speech-Language Pathology SC Acoustics; Audiology & Speech-Language Pathology GA HT688 UT WOS:A1992HT68800001 ER PT J AU PFLUG, LA IOUP, GE IOUP, JW BARNES, KH FIELD, RL RAYBORN, GH AF PFLUG, LA IOUP, GE IOUP, JW BARNES, KH FIELD, RL RAYBORN, GH TI DETECTION OF OSCILLATORY AND IMPULSIVE TRANSIENTS USING HIGHER-ORDER CORRELATIONS AND SPECTRA SO JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA LA English DT Article ID NOISE; BISPECTRUM; SIGNALS AB Higher-order cross and ordinary correlation detectors are applied to four deterministic transients contaminated by uncorrelated Gaussian noise only. Histograms and moments are used to examine the properties of the signals and their effect on detector performance. Receiver operating characteristic (ROC) curve analysis and limiting signal-to-noise ratios for "good" detection provide comparative measures for different detectors. Probability density functions of detection ordinate values of signal-present and noise-only correlations are used to explain ROC curve behavior. Using a known source, the cross-correlation detector performs better than the higher-order correlation detectors for each transient studied. However, for an unknown narrow pulse source signal, the bicorrelation and tricorrelation detectors outperform the cross-correlation detector. In contrast, the bicorrelation detector performs very poorly for low-frequency narrow-band signals with a small third moment embedded in uncorrelated Gaussian noise. Rectification as part of the detection process improves the performance of the bicorrelation detector and also places the peak of maximum magnitude at the origin. This eliminates the problem in detection or time delay estimation that the existence of multiple peaks due to symmetries in the auto-bicorrelation or the bicorrelation of repeated signals may cause. The tricorrelation detector also performs better with rectification than without. For an unknown source, the bicorrelation and tricorrelation detectors with rectification perform on a level comparable to the cross-correlation detector for certain signals. Comparisons are made between repeating a known source and repeating noisy received signals in the bicorrelation. C1 UNIV NEW ORLEANS,DEPT PHYS,NEW ORLEANS,LA 70148. UNIV SO MISSISSIPPI,DEPT PHYS & ASTRON,HATTIESBURG,MS 39406. RP PFLUG, LA (reprint author), USN,RES LAB DETACHMENT,BAY ST LOUIS,MS 39529, USA. NR 38 TC 14 Z9 14 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 MAY PY 1992 VL 91 IS 5 BP 2763 EP 2776 DI 10.1121/1.402957 PG 14 WC Acoustics; Audiology & Speech-Language Pathology SC Acoustics; Audiology & Speech-Language Pathology GA HT688 UT WOS:A1992HT68800031 ER PT J AU ZIOMEK, LJ BRECKENRIDGE, RP AF ZIOMEK, LJ BRECKENRIDGE, RP TI ESTIMATION OF THE SPHERICAL COORDINATES OF MULTIPLE BROAD-BAND TARGETS VIA ADAPTIVE BEAMFORMING AND NONLINEAR LEAST-SQUARES SO JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA LA English DT Article AB Computer simulation studies of a frequency domain adaptive beamforming algorithm for planar arrays are presented. The algorithm is a modified, complex, least-mean-square (LMS) adaptive algorithm that provides estimates of the spherical coordinates (i.e., range, depression angle, and bearing angle) of multiple broadband targets in both the near-field and far-field regions of a planar array. Computer simulation results comparing the average range, depression angle, and bearing angle estimation errors as a function of the input signal-to-noise ratio (SNR) at a single element in the array, range (near field and far field), and harmonic number (frequency) are presented. RP ZIOMEK, LJ (reprint author), USN,POSTGRAD SCH,DEPT ELECT & COMP ENGN,CODE EC-ZM,MONTEREY,CA 93943, USA. NR 9 TC 0 Z9 0 U1 0 U2 0 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0001-4966 J9 J ACOUST SOC AM JI J. Acoust. Soc. Am. PD MAY PY 1992 VL 91 IS 5 BP 2799 EP 2804 DI 10.1121/1.402960 PG 6 WC Acoustics; Audiology & Speech-Language Pathology SC Acoustics; Audiology & Speech-Language Pathology GA HT688 UT WOS:A1992HT68800034 ER PT J AU HARRIS, DC HAYES, GA JAEGER, NA SAWYER, LD SCHERI, RC HILLS, ME HAYES, KR HOMER, SE TSAI, YL MECHOLSKY, JJ AF HARRIS, DC HAYES, GA JAEGER, NA SAWYER, LD SCHERI, RC HILLS, ME HAYES, KR HOMER, SE TSAI, YL MECHOLSKY, JJ TI MECHANICAL STRENGTH OF HEMISPHERIC DOMES OF YTTRIA AND LANTHANA-DOPED YTTRIA SO JOURNAL OF THE AMERICAN CERAMIC SOCIETY LA English DT Article DE YTTRIA; LANTHANUM; DOPANTS; FLEXURAL STRENGTH; FRACTURE TOUGHNESS ID MEASURING FRACTURE-TOUGHNESS; INDENTATION TECHNIQUES; SIZE AB The strength of hemispheric ceramic domes was measured in a biaxial flexure test using disklike circular pieces removed with a core drill. Yttria and lanthana-doped yttria dome cores exhibit approximately 60% of the strength predicted from similarly fabricated flat disks. Measured strengths agree with those predicted from observed fracture-initiating defects. C1 UNIV FLORIDA,DEPT MAT SCI & ENGN,GAINESVILLE,FL 32611. RP HARRIS, DC (reprint author), USN,CTR WEAP,DEPT RES,DIV CHEM,CHINA LAKE,CA 93555, USA. NR 22 TC 9 Z9 9 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 MAY PY 1992 VL 75 IS 5 BP 1247 EP 1253 DI 10.1111/j.1151-2916.1992.tb05564.x PG 7 WC Materials Science, Ceramics SC Materials Science GA HU733 UT WOS:A1992HU73300029 ER PT J AU LINENGER, JM SHWAYHAT, AF AF LINENGER, JM SHWAYHAT, AF TI EPIDEMIOLOGY OF PODIATRIC INJURIES IN UNITED-STATES MARINE RECRUITS UNDERGOING BASIC TRAINING SO JOURNAL OF THE AMERICAN PODIATRIC MEDICAL ASSOCIATION LA English DT Article AB The authors determined the incidence of podiatric injuries that occurred during 233,946 recruit days at risk among US Marine Corps recruits undergoing basic training at the Marine Corps Recruit Depot, San Diego, CA, between February 5 and April 25, 1990. Training-related initial injuries to the foot occurred at a rate of 3.0 new injuries per 1,000 recruit days. The highest specific rates of injury occurred with stress fractures to the foot (0.56 per 1,000 recruit days), ankle sprains (0.53 per 1,000 recruit days), and Achilles tendinitis (0.39 per 1,000 recruit days). RP LINENGER, JM (reprint author), USN,HLTH RES CTR,DEPT HLTH SCI & EPIDEMIOL,DIV EPIDEMIOL,POB 885122,SAN DIEGO,CA 92186, USA. NR 0 TC 18 Z9 18 U1 0 U2 1 PU AMER PODIATRIC MED ASSN PI BETHESDA PA 9312 OLD GEORGETOWN ROAD, BETHESDA, MD 20814-1621 SN 0003-0538 J9 J AM PODIAT MED ASSN JI J. Am. Podiatr. Med. Assoc. PD MAY PY 1992 VL 82 IS 5 BP 269 EP 271 PG 3 WC Orthopedics SC Orthopedics GA HZ489 UT WOS:A1992HZ48900005 PM 1353532 ER PT J AU MCELVANY, SW ROSS, MM AF MCELVANY, SW ROSS, MM TI MASS-SPECTROMETRY AND FULLERENES SO JOURNAL OF THE AMERICAN SOCIETY FOR MASS SPECTROMETRY LA English DT Review ID CARBON CLUSTER IONS; CN ABUNDANCE DISTRIBUTIONS; LASER VAPORIZATION; SEMICONDUCTOR CLUSTERS; CYCLOTRON RESONANCE; NEUTRAL FRAGMENT; NIOBIUM CLUSTERS; MAGIC NUMBERS; C-60; BUCKMINSTERFULLERENE AB This article presents, from a mass spectrometry perspective, an historical account of research on gas-phase carbon clusters, which has led to the discovery of another form of carbon, fullerenes. In addition, more recent mass spectrometric studies on analysis of fullerene derivatives and synthesis of doped fullerenes are described. The early, strong evidence for certain "magic number"carbon clusters, most notably C60 (buckminsterfullerene), was obtained largely from mass spectrometric experiments. These studies led to the controversial postulation of the soccerball structure for C60, which provoked increased experimental and theoretical efforts. This research eventually resulted in the discovery of a simple method by which large quantities of fullerenes can be produced. The availability of these new, all-carbon molecules has motivated a broad range of synthetic and characterization studies that are expanding at a frenetic pace. Mass spectrometry not only played a critical role in the discovery of fullerenes but also now is crucial for determination of the unusual chemical and physical properties of fullerenes and fullerene-based materials. C1 USN,RES LAB,DIV CHEM,CODE 6113,WASHINGTON,DC 20375. NR 121 TC 63 Z9 63 U1 3 U2 18 PU ELSEVIER SCIENCE INC PI NEW YORK PA 655 AVENUE OF THE AMERICAS, NEW YORK, NY 10010 SN 1044-0305 J9 J AM SOC MASS SPECTR JI J. Am. Soc. Mass Spectrom. PD MAY PY 1992 VL 3 IS 4 BP 268 EP 280 DI 10.1016/1044-0305(92)87054-3 PG 13 WC Chemistry, Analytical; Chemistry, Physical; Spectroscopy SC Chemistry; Spectroscopy GA HV637 UT WOS:A1992HV63700001 PM 24243037 ER PT J AU MILLER, AR AF MILLER, AR TI INCOMPLETE LIPSCHITZ-HANKEL INTEGRALS OF STRUVE FUNCTIONS SO JOURNAL OF THE FRANKLIN INSTITUTE-ENGINEERING AND APPLIED MATHEMATICS LA English DT Article AB Representations for incomplete Lipschitz-Hankel integrals of Struve functions are given in closed form by using Kampe de Feriet functions whose double series representations converge everywhere. RP MILLER, AR (reprint author), USN,RES LAB,DIV INFORMAT TECHNOL,WASHINGTON,DC 20375, USA. NR 12 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 0016-0032 J9 J FRANKLIN I JI J. Frankl. Inst.-Eng. Appl. Math. PD MAY PY 1992 VL 329 IS 3 BP 563 EP 581 DI 10.1016/0016-0032(92)90055-L PG 19 WC Automation & Control Systems; Engineering, Multidisciplinary; Engineering, Electrical & Electronic; Mathematics, Interdisciplinary Applications SC Automation & Control Systems; Engineering; Mathematics GA HN260 UT WOS:A1992HN26000014 ER PT J AU CHALMERS, RH AF CHALMERS, RH TI TAILORING SHIPBOARD ENVIRONMENTAL SPECIFICATIONS .2. SINGLE-FREQUENCY VIBRATION SO JOURNAL OF THE IES LA English DT Article DE NAVAL SHIPS; SURFACE COMBATANTS; SHIPBOARD ENVIRONMENTS; TAILORING; REQUIREMENTS; SPECIFICATIONS; VIBRATION; MEASURED LEVELS; HUMAN TOLERANCE; TEST DESIGN AB This article, the second in a three-part series, is extracted from Technical Document (TD 2071) published by the Naval Ocean Systems Center in April, 1991. Titled "Tailoring Shipboard Environmental Specifications, A Guide for Navy Program Managers," the document presents a compliation of shipboard environmental data measured over the years. The applicability of the data to the fleet of today is discussed. Methods of tailoring systems specifications and tests for the environment existing at given locations on a variety of Naval ships are also included. The first article in this series (Journal of the IES, p. 25, March, April, 1992) included the Introduction, Temperature and Humidity, and Shock sections of TD 2071. This article covers the first part of the TD 2071 discussion of vibration. The third article will finish the discussion of vibration and present a "tailored" vibration requirement that a program manager might include in a procurement package for new shipboard systems. RP CHALMERS, RH (reprint author), USN,CTR OCEAN SYST,SAN DIEGO,CA 92152, USA. NR 0 TC 0 Z9 0 U1 0 U2 1 PU INST ENVIRONMENTAL SCI PI MT PROSPECT PA 940 E NORTHWEST HIGHWAY, MT PROSPECT, IL 60056 SN 1052-2883 J9 J IES JI J. IES PD MAY-JUN PY 1992 VL 35 IS 3 BP 27 EP 36 PG 10 WC Engineering, Environmental; Environmental Sciences; Instruments & Instrumentation SC Engineering; Environmental Sciences & Ecology; Instruments & Instrumentation GA JA790 UT WOS:A1992JA79000003 ER PT J AU XIA, JQ JORDAN, AK KONG, JA AF XIA, JQ JORDAN, AK KONG, JA TI INVERSE-SCATTERING VIEW OF MODAL STRUCTURES IN INHOMOGENEOUS OPTICAL WAVE-GUIDES SO JOURNAL OF THE OPTICAL SOCIETY OF AMERICA A-OPTICS IMAGE SCIENCE AND VISION LA English DT Article ID WAVE-GUIDES; DESIGN AB To understand the physical meaning of rational reflection coefficients in inverse-scattering theory for optical waveguide design [J. Opt. Soc. Am. A 6, 1206 (1989)], we studied the relationship between the poles of the transverse reflection coefficient and the modes in inhomogeneous dielectrics. By using a stratified-medium formulation we showed that these poles of the spectral reflection coefficient satisfy the same equation as the guidance condition in inhomogeneous waveguides. Therefore, in terms of wave numbers, the poles are the same as the discrete modes in the waveguide. The radiation modes have continuous real values of transverse wave numbers and are represented by the branch cut on the complex plane. Based on these results, applications of the Gel'fand-Levitan-Marchenko theory to optical waveguide synthesis with the rational function representation of the transverse reflection coefficient are discussed. C1 USN,RES LAB,CTR ADV SPACE SENSING,WASHINGTON,DC 20375. RP XIA, JQ (reprint author), MIT,DEPT ELECT ENGN & COMP SCI,CAMBRIDGE,MA 02139, USA. NR 14 TC 13 Z9 13 U1 0 U2 0 PU OPTICAL SOC AMER PI WASHINGTON PA 2010 MASSACHUSETTS AVE NW, WASHINGTON, DC 20036 SN 0740-3232 J9 J OPT SOC AM A JI J. Opt. Soc. Am. A-Opt. Image Sci. Vis. PD MAY PY 1992 VL 9 IS 5 BP 740 EP 748 DI 10.1364/JOSAA.9.000740 PG 9 WC Optics SC Optics GA HQ478 UT WOS:A1992HQ47800011 ER PT J AU DRISCOLL, DC SHEINSON, RS AF DRISCOLL, DC SHEINSON, RS TI DIRECT-CURRENT PLASMA DISCHARGES OF FLUOROBROMOMETHANES SO JOURNAL OF VACUUM SCIENCE & TECHNOLOGY A-VACUUM SURFACES AND FILMS LA English DT Article ID SILICON; FRAGMENTATION; CF3CL AB The ion yield from dc discharges in the fluorobromomethanes CF4-xBrx (x = 0 to x = 3) an CF3Cl has been observed. The ion yield variation with pressure and power is presented. Results for the bromine substituted methanes, and CF3Cl have been compared to examine the effects of molecular symmetry (chemical substitution), and of the electronegativity of the halogen substituent. Input power was varied in order to observe approximate discharge energy de dance, and cell pressure was varied to explore the importance of ion molecule collisions. C1 USN,RES LAB,WASHINGTON,DC 20375. NR 31 TC 5 Z9 5 U1 0 U2 0 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0734-2101 J9 J VAC SCI TECHNOL A JI J. Vac. Sci. Technol. A-Vac. Surf. Films PD MAY-JUN PY 1992 VL 10 IS 3 BP 444 EP 449 DI 10.1116/1.578169 PG 6 WC Materials Science, Coatings & Films; Physics, Applied SC Materials Science; Physics GA HU242 UT WOS:A1992HU24200004 ER PT J AU TADAYON, B FATEMI, M TADAYON, S MOORE, F DIETRICH, H AF TADAYON, B FATEMI, M TADAYON, S MOORE, F DIETRICH, H TI ELECTRICAL CHARACTERIZATION OF LOW-TEMPERATURE GAAS-LAYERS, AND OBSERVATION OF THE EXTREMELY LARGE CARRIER CONCENTRATIONS IN UNDOPED MATERIAL SO JOURNAL OF VACUUM SCIENCE & TECHNOLOGY B LA English DT Article ID BEAM-EPITAXIAL GAAS; BUFFER; MESFETS; BAND; MBE AB We present here the results of a study on the effect of substrate temperature T(s) on the electrical and physical characteristics of low temperature molecular-beam epitaxy GaAs layers. Based on the x-ray results, three temperature ranges have been defined for T(s): 1) high range (T(s) greater-than-or-equal-to 460-degrees-C), 2) intermediate range (260 less-than-or-equal-to T(s) less-than-or-equal-to 450-degrees-C), and 3) low range (the amorphous range) (T(s) less-than-or-equal-to 250-degrees-C). Hall measurements have been performed on the as-grown samples and on samples annealed at 610 and 850-degrees-C. Si implantation into these layers has also been investigated. From an electrical stand point, the most striking difference between the low range and the intermediate range is the fact that after annealing at 850-degrees-C, the undoped layers grown below or at 250-degrees-C have a low resistivity (net electron concentrations as high as 1.5 x 10(18) cm-3 and mobilities as high as 920 cm2 V-1 s-1), while after anneal the undoped layers grown in the intermediate range have extremely high resistivity (about 8 x 10(5) OMEGA cm). RP TADAYON, B (reprint author), USN,RES LAB,CODE 6856,WASHINGTON,DC 20375, USA. NR 14 TC 9 Z9 9 U1 0 U2 1 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 1071-1023 J9 J VAC SCI TECHNOL B JI J. Vac. Sci. Technol. B PD MAY-JUN PY 1992 VL 10 IS 3 BP 1074 EP 1077 DI 10.1116/1.586080 PG 4 WC Engineering, Electrical & Electronic; Nanoscience & Nanotechnology; Physics, Applied SC Engineering; Science & Technology - Other Topics; Physics GA HZ485 UT WOS:A1992HZ48500004 ER PT J AU SWINDLE, GM SEAMAN, KG ARTHUR, DC ALMQUIST, TD AF SWINDLE, GM SEAMAN, KG ARTHUR, DC ALMQUIST, TD TI THE 6 HOUR OBSERVATION RULE FOR GRADE I CROTALID ENVENOMATION - IS IT SUFFICIENT - CASE-REPORT OF DELAYED ENVENOMATION SO JOURNAL OF WILDERNESS MEDICINE LA English DT Article DE SNAKE BITE; CROTALID; ENVENOMATION; ANTIVENIN AB A 16-year-old male was evaluated in the Emergency Department for a rattlesnake bite on the left calf. He was released following 6 h of observation, as recommended in standard references, without complaints or objective criteria present to indicate envenomation. The patient returned 36 h later complaining of severe pain at the bite site and showing objective evidence for systemic envenomation. He was successfully treated for crotalid envenomation with antivenin. This case demonstrates that initial systemic signs and symptoms may begin more than 6 h after crotalid envenomation. Therefore, we recommend that snake bite care must be coupled with close outpatient follow-up for 24 h. C1 USN HOSP,DEPT CLIN INVEST,SAN DIEGO,CA 92134. NR 0 TC 3 Z9 3 U1 0 U2 0 PU CHAPMAN HALL LTD PI LONDON PA 2-6 BOUNDARY ROW, LONDON, ENGLAND SE1 8HN SN 0953-9859 J9 J WILDERNESS MED PD MAY PY 1992 VL 3 IS 2 BP 168 EP 172 DI 10.1580/0953-9859-3.2.168 PG 5 WC Medicine, General & Internal; Physiology SC General & Internal Medicine; Physiology GA HT150 UT WOS:A1992HT15000008 ER PT J AU PATTON, JS WOLF, K AF PATTON, JS WOLF, K TI FIRE AND SMOKE CORROSIVITY OF METALS SO MATERIALS PERFORMANCE LA English DT Article AB The combined effects of fire, corrosive smoke, and particulate has been defined as fire corrosivity. While the effects of fire corrosivity are well known, little quantitative information is available concerning the mechanisms involved and the degree to which materials, particularly metals, are susceptible. In this investigation, the deleterious effects of combustion products generated during fires on normal construction materials are documented. RP PATTON, JS (reprint author), USN,DAVID TAYLOR RES CTR,CODE 2813,ANNAPOLIS,MD 21402, USA. NR 3 TC 0 Z9 0 U1 0 U2 0 PU NATL ASSN CORROSION ENG PI HOUSTON PA 1440 SOUTH CREEK DRIVE, HOUSTON, TX 77084-4906 SN 0094-1492 J9 MATER PERFORMANCE JI Mater. Perform. PD MAY PY 1992 VL 31 IS 5 BP 46 EP 49 PG 4 WC Materials Science, Characterization & Testing SC Materials Science GA HY885 UT WOS:A1992HY88500009 ER PT J AU BOBB, LC SHANKAR, PM AF BOBB, LC SHANKAR, PM TI TAPERED OPTICAL FIBER COMPONENTS AND SENSORS SO MICROWAVE JOURNAL LA English DT Article ID SINGLE-MODE FIBERS; CONTROLLED CORE DIFFUSION; COUPLERS; FILTER C1 DREXEL UNIV,PHILADELPHIA,PA 19104. RP BOBB, LC (reprint author), USN,CTR AIR WARFARE,WARMINSTER,PA 18974, USA. NR 34 TC 5 Z9 5 U1 0 U2 0 PU HORIZON HOUSE-MICROWAVE PI NORWOOD PA 685 CANTON ST, NORWOOD, MA 02062 SN 0192-6225 J9 MICROWAVE J JI Microw. J. PD MAY PY 1992 VL 35 IS 5 BP 218 EP & PG 0 WC Engineering, Electrical & Electronic; Telecommunications SC Engineering; Telecommunications GA JF815 UT WOS:A1992JF81500002 ER PT J AU TOURVILLE, JF ANDERSON, RL BAKER, LT AF TOURVILLE, JF ANDERSON, RL BAKER, LT TI DECENTRALIZED OPERATING-ROOM PHARMACY SERVICES IN A MILITARY TEACHING HOSPITAL SO MILITARY MEDICINE LA English DT Article AB The development, initiation, and evaluation of a decentralized pharmacy satellite within the operating room, requiring neither additional capital funding nor any major construction, is described. The satellite offers numerous programs to aid the operating room staff. Included in this effort is the complete management of all controlled substances within the operating room, post-anesthesia-care unit, and same-day-surgery unit. Pharmacists function as pharmaceutical resources playing a major role in the pain service unit. Success of the satellite is assessed via a number of parameters including staff survey response, quality assurance impact, and inventory management. RP TOURVILLE, JF (reprint author), USN HOSP,DEPT CLIN INVEST,SAN DIEGO,CA 92134, USA. NR 0 TC 0 Z9 0 U1 0 U2 1 PU ASSN MILITARY SURG US PI BETHESDA PA 9320 OLD GEORGETOWN RD, BETHESDA, MD 20814 SN 0026-4075 J9 MIL MED JI Milit. Med. PD MAY PY 1992 VL 157 IS 5 BP 262 EP 265 PG 4 WC Medicine, General & Internal SC General & Internal Medicine GA HT318 UT WOS:A1992HT31800018 PM 1630661 ER PT J AU SIELSKI, RA AF SIELSKI, RA TI FRACTURE-MECHANICS OF SHIP STRUCTURES SO NAVAL ENGINEERS JOURNAL LA English DT Article AB Using international cooperative exchange programs, the Department of Defense is currently working with U.S. steel makers to improve the technology base so that they can produce new highly weldable, low alloy, high strength alloys. The development program for these alloys should insure adequate strength and toughness, but not impose excessive requirements. That program justifies the need for a greater understanding of the use of fracture mechanics for the selection of structural materials. There have been several recent independent extensive studies of the application of fracture mechanics to ship structures sponsored by the Ship Structure Committee, the Naval Research Laboratory, David Taylor Research Center, and the Admiralty Research Establishment. The recommendations of these experts range from continued use of existing material parameters, use of linear elastic fracture mechanics, and the use of ductile fracture mechanics for determining the requirements for hull material. This paper reviews the results of these studies and recommends an approach to the development of rational criteria. The Navy is starting an extensive research and development program to verify the chosen methodology, including the testing of large scale sections that will replicate ship hulls. The result of this application of theory and verification through testing will be a new basis for the determination of the toughness requirements for ship structures, avoiding excessive requirements as we seek to use the latest materials that will be available during this decade and in the twenty-first century. RP SIELSKI, RA (reprint author), USN,CTR SHIP ENGN,STRUCT GRP,HYATTSVILLE,MD 20787, USA. NR 0 TC 3 Z9 3 U1 0 U2 3 PU AMER SOC NAVAL ENG INC PI ALEXANDRIA PA 1452 DUKE STREET, ALEXANDRIA, VA 22314-3458 SN 0028-1425 J9 NAV ENG J JI Nav. Eng. J. PD MAY PY 1992 VL 104 IS 3 BP 36 EP 45 PG 10 WC Engineering, Marine; Engineering, Civil; Oceanography SC Engineering; Oceanography GA HP329 UT WOS:A1992HP32900002 ER PT J AU SMOOKLER, A ALIG, C AF SMOOKLER, A ALIG, C TI THE NAVY SHIPBOARD WASTE MANAGEMENT RESEARCH-AND-DEVELOPMENT PROGRAM SO NAVAL ENGINEERS JOURNAL LA English DT Article AB Increasing federal regulatory restrictions on overboard waste discharge in national and international waters require that the Navy develop shipboard equipment and procedures to process and store a wide range of wastes onboard surface ships or, where permitted, to discharge certain wastes in environmentally acceptable forms. Navy policy and guidance recognizes the fleet's environmental responsibilities, and major research, development, test, and evaluation efforts are being conducted to develop and evaluate suitable shipboard waste processing systems for oily wastes, non-oily wastewater, hazardous wastes/materials, and solid wastes. Environmental protection systems for back-fit and forward-fit are being developed. A wide range of shipboard requirements must be accommodated, including space, size/weight, safety/health, and reliability. Current priorities focus on plastics and other solid wastes, oily wastes, ozone depleting chlorofluorocarbons and blackwater. Significant progress is being made, and the Navy is confident that ship designs for the 21st century will be environmentally sound. C1 USN,CTR SURFACE WARFARE,CARDEROCK DIV,ENVIRONM PROTECT BRANCH,ANNAPOLIS,MD 21402. NR 0 TC 2 Z9 2 U1 2 U2 5 PU AMER SOC NAVAL ENG INC PI ALEXANDRIA PA 1452 DUKE STREET, ALEXANDRIA, VA 22314-3458 SN 0028-1425 J9 NAV ENG J JI Nav. Eng. J. PD MAY PY 1992 VL 104 IS 3 BP 89 EP 97 PG 9 WC Engineering, Marine; Engineering, Civil; Oceanography SC Engineering; Oceanography GA HP329 UT WOS:A1992HP32900007 ER PT J AU SOTTILARE, RA LONG, RA AF SOTTILARE, RA LONG, RA TI INNOVATIONS IN TRAINING SIMULATION SO NAVAL ENGINEERS JOURNAL LA English DT Article AB With the Navy leaning towards a smaller but better trained force, using simulators in training becomes a cost effective way of keeping our military edge. Several innovations are being utilized in today's simulators. Hardware and software designs now include distributed computer architectures, real-time, multi-tasking operating systems, flexible generic consoles, commercial off-the-shelf equipment, standard real-time ocean acoustic models, and standard acoustic data bases. This paper describes these technologies and their innovative application in the Navy's newest Anti-Submarine Warfare Team Trainer, Device 14A12. Device 14A12 simulates sonar, fire control, electronic warfare, bridge, ownship aircraft and Naval Tactical Data Systems (NTDS) for 16 surface ownship classes. Device 14A12 also simulates multiple air, surface and subsurface threat, neutral and friendly platforms as well as missiles and torpedoes. The innovative modeling of these systems along with Device 14A12's enormous flexibility will allow the Navy to provide effective tactical training for the surface fleet now and in the future. RP SOTTILARE, RA (reprint author), USN,CTR TRAINING SYST,ORLANDO,FL, USA. OI Sottilare, Robert/0000-0002-5278-2441 NR 0 TC 0 Z9 0 U1 0 U2 3 PU AMER SOC NAVAL ENG INC PI ALEXANDRIA PA 1452 DUKE STREET, ALEXANDRIA, VA 22314-3458 SN 0028-1425 J9 NAV ENG J JI Nav. Eng. J. PD MAY PY 1992 VL 104 IS 3 BP 141 EP 147 PG 7 WC Engineering, Marine; Engineering, Civil; Oceanography SC Engineering; Oceanography GA HP329 UT WOS:A1992HP32900013 ER PT J AU HEALEY, AJ GOOD, MR AF HEALEY, AJ GOOD, MR TI THE NPS AUV-II AUTONOMOUS UNDERWATER VEHICLE TESTBED - DESIGN AND EXPERIMENTAL-VERIFICATION SO NAVAL ENGINEERS JOURNAL LA English DT Article AB The design, construction and testing of an autonomous underwater vehicle (AUV) for use as a research and development testbed at the Naval Postgraduate School (NPS) is presented. Design objectives, analysis and trade-offs are discussed with respect to a generic AUV with specific details for the case of the NPS AUV II. System integration and flexibility are emphasized in the subject vehicle to support presently planned and future research employment. Hull, mobility, sensors, automatic control, and energy subsystems are described. Design and fabrication techniques for the NPS AUV II vehicle hull and equipment are documented. Some results from an experimental program illustrating verification of vehicle design are described. RP HEALEY, AJ (reprint author), USN,POSTGRAD SCH,WASHINGTON,DC 20350, USA. NR 0 TC 3 Z9 5 U1 0 U2 2 PU AMER SOC NAVAL ENG INC PI ALEXANDRIA PA 1452 DUKE STREET, ALEXANDRIA, VA 22314-3458 SN 0028-1425 J9 NAV ENG J JI Nav. Eng. J. PD MAY PY 1992 VL 104 IS 3 BP 191 EP 202 PG 12 WC Engineering, Marine; Engineering, Civil; Oceanography SC Engineering; Oceanography GA HP329 UT WOS:A1992HP32900018 ER PT J AU WINGO, RA HOLMES, JJ LACKEY, MH AF WINGO, RA HOLMES, JJ LACKEY, MH TI TEST OF CLOSED-LOOP DEGAUSSING ALGORITHM ON A MINESWEEPER ENGINE SO NAVAL ENGINEERS JOURNAL LA English DT Article AB A closed-loop degaussing technique for MCM (mine countermeasure) class vessels has been developed and tested on a minesweeper engine. The system was designed to accurately predict and degauss the off-board magnetic field signatures from measurements taken on-board a non-magnetic hull naval signature prediction algorithm have been investigated. An on-board sensor configuration, that requires only four single axis gradiometers, has been shown to accurately predict the magnetic signatures of the full-scale engine. RP WINGO, RA (reprint author), USN,CTR SURFACE WARFARE,DEPT PROTECT SYST,WASHINGTON,DC 20350, USA. NR 0 TC 1 Z9 1 U1 0 U2 0 PU AMER SOC NAVAL ENG INC PI ALEXANDRIA PA 1452 DUKE STREET, ALEXANDRIA, VA 22314-3458 SN 0028-1425 J9 NAV ENG J JI Nav. Eng. J. PD MAY PY 1992 VL 104 IS 3 BP 219 EP 227 PG 9 WC Engineering, Marine; Engineering, Civil; Oceanography SC Engineering; Oceanography GA HP329 UT WOS:A1992HP32900021 ER PT J AU GRIFFIN, OM PELTZER, RD REED, AM BECK, RF AF GRIFFIN, OM PELTZER, RD REED, AM BECK, RF TI REMOTE-SENSING OF SURFACE SHIP WAKES SO NAVAL ENGINEERS JOURNAL LA English DT Article AB Recently, there has been much interest in the remote sensing of surface ship wakes using synthetic aperture radar (SAR). Ship wake signatures obtained using a SAR have several prominent features such as a dark trailing centerline region, bright-line images aligned at some angle to the ship's path, and sometimes the distinctive Kelvin ship wave pattern. The origins of these features are not well understood. Many different theories are available to explain one or more of the features. These theories are often in conflict and no difinitive answers are yet available. Much analytical and numerical research, and both laboratory and full-scale experiments are presently underway in order to develop proper explanations for these features. This paper first describes in some detail the distinctive features of SAR images. Then actual examples from early SEASAT SAR images, the JOWIP/Georgia Straight and SIR-B experiments, and the recent ONR remote sensing experiments are given. The observed radar image morphology includes dark centerline wake features, narrow-V bright line features, and Kelvin wave manifestations. RP GRIFFIN, OM (reprint author), USN,RES LAB,CTR ADV SPACE SENSING,WASHINGTON,DC 20375, USA. NR 0 TC 8 Z9 8 U1 1 U2 4 PU AMER SOC NAVAL ENG INC PI ALEXANDRIA PA 1452 DUKE STREET, ALEXANDRIA, VA 22314-3458 SN 0028-1425 J9 NAV ENG J JI Nav. Eng. J. PD MAY PY 1992 VL 104 IS 3 BP 245 EP 258 PG 14 WC Engineering, Marine; Engineering, Civil; Oceanography SC Engineering; Oceanography GA HP329 UT WOS:A1992HP32900024 ER PT J AU BERTRAM, A BEASLEY, K DELATORRE, W AF BERTRAM, A BEASLEY, K DELATORRE, W TI AN OVERVIEW OF NAVY COMPOSITE DEVELOPMENTS FOR THERMAL MANAGEMENT SO NAVAL ENGINEERS JOURNAL LA English DT Article AB This paper reviews: (1) Navy sponsorship of pitch graphite fiber development, and (2) assesses the impact of the high thermal conductivity fibers on future Navy applications. Navy exploratory development programs (6.2) have revealed potential applications in advanced system for graphite fiber reinforced composites: (1) electronic packaging, (2) satellite radiators, and (3) elevated temperature applications such as missiles. Thermal management in these applications can be improved through the development and use of high thermal conductivity graphite fibers. In electronic packaging, the thermal planes that conductively cool the Standard Electronic Module, Format E (SEM-E) printed wiring board require both high thermal conductivity and thermal expansion matching. For satellite radiators, the graphite fiber reinforced metals offer a zero coefficient of thermal expansion, with maximum specific modulus. The joints between titanium missile structures and their ceramic nose cones require thermal expansion control, but high thermal conductivity is also a distinct advantage. Pitch graphite fibers are now available with a thermal conductivity of 1000-1100 W/mK and a modulus of 130-140 msi. Significant growth toward the theoretical thermal conductivity of graphite, at 2400 W/mK, is possible. The benefits of these fiber properties are shown for applications that are either thermal expansion or thermal conductivity dependent. RP BERTRAM, A (reprint author), USN,CTR SURFACE WARFARE,WASHINGTON,DC 20350, USA. NR 0 TC 6 Z9 6 U1 0 U2 1 PU AMER SOC NAVAL ENG INC PI ALEXANDRIA PA 1452 DUKE STREET, ALEXANDRIA, VA 22314-3458 SN 0028-1425 J9 NAV ENG J JI Nav. Eng. J. PD MAY PY 1992 VL 104 IS 3 BP 276 EP 285 PG 10 WC Engineering, Marine; Engineering, Civil; Oceanography SC Engineering; Oceanography GA HP329 UT WOS:A1992HP32900026 ER PT J AU MORAN, AL AF MORAN, AL TI INDUSTRIALIZATION OF THE SPRAY FORMING PROCESS FOR MILITARY APPLICATIONS SO NAVAL ENGINEERS JOURNAL LA English DT Article AB Spray forming is a single step gas atomization/deposition process which yields ferrous and non-ferrous near net shape preforms. It has proven to be a viable, cost effective alternative to conventional metal working technology for the production of material preforms with properties surpassing those of their cast and wrought counterparts. Current Navy programs are aimed at optimization of the process, certification of the spray formed products and industrialization of the technology. This includes the development of robust, real-time sensors interfaced with an automated fuzzy logic controller and expanded motion control system. The system will have the capability to manufacture low cost, imporved performance, non-symmetric components currently producible only by casting or forging. In addition commercially available spray formed piping from foreign sources is currently being evaluated and certified for near term use in the fleet. Industrialization efforts are underway to establish domestic capabilities as there are no commercial facilities in the United States to date. The Navy has just initiated a manufacturing technology program, the intent of which is to develop a commercial plant in the United States capable of producing large military components. This paper will describe the process and program status. Results and comparative data will be presented and potential new applications discussed. RP MORAN, AL (reprint author), USN,CTR SURFACE WARFARE,CARDEROCK DIV,ANNAPOLIS,MD 21402, USA. NR 0 TC 0 Z9 0 U1 0 U2 1 PU AMER SOC NAVAL ENG INC PI ALEXANDRIA PA 1452 DUKE STREET, ALEXANDRIA, VA 22314-3458 SN 0028-1425 J9 NAV ENG J JI Nav. Eng. J. PD MAY PY 1992 VL 104 IS 3 BP 286 EP 290 PG 5 WC Engineering, Marine; Engineering, Civil; Oceanography SC Engineering; Oceanography GA HP329 UT WOS:A1992HP32900027 ER PT J AU HACKETT, EM JOYCE, JA AF HACKETT, EM JOYCE, JA TI USE OF J-R CURVES IN ASSESSING THE FRACTURE-BEHAVIOR OF LOW UPPER SHELF TOUGHNESS MATERIALS SO NUCLEAR ENGINEERING AND DESIGN LA English DT Article; Proceedings Paper CT 17TH MEETING ON WATER REACTOR SAFETY INFORMATION CY OCT 23-25, 1989 CL GAITHERSBURG, MD AB The objective of this investigation was to evaluate the use of small specimen J-R curves in assessing the fracture resistance behavior of reactor vessels containing low upper shelf (LUS) toughness weldments. As required by the U.S. Code of Federal Regulations (10 CFR, Part 50), reactor vessel beltline materials must maintain an upper shelf Charpy V-Notch (CVN) energy of at least 50 ft-lbs (68 J) throughout vessel life. If CVN values from surveillance specimens fall below this value, the utility must demonstrate to the U.S. Nuclear Regulatory Commission (NRC) that the lower values will provide "margins of safety against fracture equivalent to those required by Appendix G of the ASME Boiler and Pressure Vessel Code." This paper will present recommendations regarding the material fracture resistance aspects of this problem and outline an analysis procedure for demonstrating adequate fracture safety based on CVN values. It is recommended that the deformation formulation of the J-integral be used in the, analysis described above. For cases where J-integral fracture toughness testing will be required, the ASTM E1152-87 procedure should be followed, however, data should be taken to 50% to 60% of the specimen remaining ligament. Extension of the crack growth validity limits for J-R curve testing, as described in E1152-87, can be justified on the basis of a "J-controlled crack growth zone" analysis which shows an engineering basis for J-control to 25% to 40% of the specimen remaining ligament. If J-R curve extrapolations are required for the analysis, a simple power law fit to data in the extended validity region should be used. The example analysis performed for low upper shelf weld material, showed required CVN values for a reactor vessel with a 7.8 inch (198 mm) thick wall ranging from 32 ft-lbs (43 J) to 48 ft-lbs (65 J), depending on the magnitude of the thermal stress component. C1 USN ACAD,ANNAPOLIS,MD 21402. RP HACKETT, EM (reprint author), DAVID TAYLOR RES CTR,CODE 2814,ANNAPOLIS,MD 21402, USA. NR 12 TC 6 Z9 7 U1 0 U2 0 PU ELSEVIER SCIENCE SA LAUSANNE PI LAUSANNE 1 PA PO BOX 564, 1001 LAUSANNE 1, SWITZERLAND SN 0029-5493 J9 NUCL ENG DES JI Nucl. Eng. Des. PD MAY PY 1992 VL 134 IS 2-3 BP 217 EP 226 DI 10.1016/0029-5493(92)90140-Q PG 10 WC Nuclear Science & Technology SC Nuclear Science & Technology GA JC311 UT WOS:A1992JC31100006 ER PT J AU LAROCCA, RV PARK, JG DANESI, R DELTACCA, M STEINBERG, SM GAZDAR, AF AF LAROCCA, RV PARK, JG DANESI, R DELTACCA, M STEINBERG, SM GAZDAR, AF TI PATTERN OF GROWTH-FACTOR, PROTOONCOGENE AND CARCINOEMBRYONIC ANTIGEN GENE-EXPRESSION IN HUMAN COLORECTAL-CARCINOMA CELL-LINES SO ONCOLOGY LA English DT Article DE COLON CANCER; CELL LINES; GENE EXPRESSION; CLINICOBIOLOGICAL CORRELATION ID FACTOR RECEPTOR; FACTOR-BETA; C-MYC; CANCER; HOMOLOGY; TUMORS; VIRUS; DNA AB The aim of the present study was to examine whether the expression of growth factor genes, proto-oncogenes and carcinoembryonic antigen (CEA) gene in human colorectal cancer cell lines was related to their clinicobiological behavior. A significant variability among cell lines was detected for both insulin-like growth factor II and transforming growth factor-beta-gene message. Detectable levels of c-myc, Her-2, c-myb, K-ras and EGF receptor mRNA were found in most cell lines, whereas only 1/11 and 2/11 cell lines were positive for N-myc and c-sis message, respectively. N-myc expression was limited to a cell line originated from a tumor with neuroendocrine features, while high levels of K-ras message were found only in a cell line derived from a radioresistant tumor. CEA mRNA levels correlated well with the concentration of antigen in each cell line. On the basis of these results, our findings demonstrated that human colorectal cancer cell lines show heterogeneous expression of growth factor and CEA genes and proto-oncogenes; however, with the exception of K-ras, N-myc and CEA, other correlations between gene expression and the clinicobiological characteristics of these cell lines could not be demonstrated. C1 UNIV PISA,INST MED PHARMACOL,VIA ROMA 55,I-56126 PISA,ITALY. UNIV LOUISVILLE,J GRAHAM BROWN CANC CTR,DEPT MED ONCOL,LOUISVILLE,KY 40292. SEOUL NATL UNIV,COLL MED,DEPT SURG,SEOUL 151,SOUTH KOREA. SEOUL NATL UNIV HOSP,SEOUL,SOUTH KOREA. UNIV PISA,INST MED PHARMACOL,I-56100 PISA,ITALY. NCI,BIOSTAT & DATA,MANAGEMENT SECT,BETHESDA,MD 20892. NCI,NAVY MED ONCOL BRANCH,BETHESDA,MD 20892. USN HOSP,BETHESDA,MD 20814. RI Park, Jae-Gahb/J-5494-2012 NR 22 TC 9 Z9 9 U1 0 U2 1 PU KARGER PI BASEL PA ALLSCHWILERSTRASSE 10, CH-4009 BASEL, SWITZERLAND SN 0030-2414 J9 ONCOLOGY JI Oncology PD MAY-JUN PY 1992 VL 49 IS 3 BP 209 EP 214 PG 6 WC Oncology SC Oncology GA JG512 UT WOS:A1992JG51200007 PM 1495747 ER PT J AU AVERY, W BROWN, GG ROSENKRANZ, JA WOOD, RK AF AVERY, W BROWN, GG ROSENKRANZ, JA WOOD, RK TI OPTIMIZATION OF PURCHASE, STORAGE AND TRANSMISSION CONTRACTS FOR NATURAL-GAS UTILITIES SO OPERATIONS RESEARCH LA English DT Article AB Natural gas utilities supply about a quarter of the energy needs of the United States. From wellhead to consumer, operations are governed by an astounding diversity of purchase, transport, and storage contract agreements which prepare a complex physical distribution system to meet future demands no more predictable than next year's weather. We present a decision support system based on a highly detailed optimization model used by utilities to plan operations which minimize cost while satisfying regulatory agencies. Applications at Southwest Gas Corporation are presented along with a case study at Questar Pipeline Corporation. C1 PLANMETR LTD,CHICAGO,IL. USN,POSTGRAD SCH,MONTEREY,CA 93940. BOSTON ENERGY ASSOCIATES,BOSTON,MA. NR 14 TC 28 Z9 28 U1 1 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 MAY-JUN PY 1992 VL 40 IS 3 BP 446 EP 462 DI 10.1287/opre.40.3.446 PG 17 WC Management; Operations Research & Management Science SC Business & Economics; Operations Research & Management Science GA HZ318 UT WOS:A1992HZ31800002 ER PT J AU BAILEY, MP AF BAILEY, MP TI CONSTANT ACCESS SYSTEMS - A GENERAL FRAMEWORK FOR GREEDY OPTIMIZATION ON STOCHASTIC NETWORKS SO OPERATIONS RESEARCH LA English DT Article ID PERT AB We consider network optimization problems in which the weights of the edges are random variables. We develop conditions on the combinatorial structure of the problem which guarantee that the objective function value is a first passage time in an appropriately constructed continuous time Markov chain. The arc weights must be distributed exponentially, the method of solution of the deterministic problem must be greedy in a general sense, and the accumulation of objective function value during the greedy procedure must occur at a constant rate. We call these structures constant access systems after the third property. Examples of constant access systems include the shortest path system, the longest path system, the time until disconnection in a network of failing components, and some bottleneck optimization problems. For each system, we give the distribution of the objective function, the distribution of the solution of the problem, and the probability that a given arc is a member of the optimal solution. We also provide easily implementable formulas for the moments of each optimal objective function value, as well as criticality indices for each arc. RP BAILEY, MP (reprint author), USN,SCH POSTGRAD,MONTEREY,CA 93940, USA. NR 19 TC 2 Z9 2 U1 0 U2 0 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 MAY-JUN PY 1992 VL 40 SU 2 BP S195 EP S209 DI 10.1287/opre.40.3.S195 PG 15 WC Management; Operations Research & Management Science SC Business & Economics; Operations Research & Management Science GA HZ469 UT WOS:A1992HZ46900002 ER PT J AU ROLF, KC PARKER, MW PELLEU, GB AF ROLF, KC PARKER, MW PELLEU, GB TI STRESS-ANALYSIS OF 5 PREFABRICATED ENDODONTIC DOWEL DESIGNS - A PHOTOELASTIC STUDY SO OPERATIVE DENTISTRY LA English DT Article AB The stress generated by five prefabricated endodontic dowel designs was evaluated using a two-dimensional photoelastic model. Cemented posts caused the least stress. Of the threaded posts, Flexi-post and Radix Anker produced the least stress; Kurer Crown Anchor produced the most. RP ROLF, KC (reprint author), USN,NATL NAVAL DENT CTR,SCH DENT,BETHESDA,MD 20889, USA. NR 0 TC 10 Z9 10 U1 1 U2 1 PU UNIV WASHINGTON PI SEATTLE PA SCHOOL DENTISTRY SM-57, SEATTLE, WA 98195 SN 0361-7734 J9 OPER DENT JI Oper. Dent. PD MAY-JUN PY 1992 VL 17 IS 3 BP 86 EP 92 PG 7 WC Dentistry, Oral Surgery & Medicine SC Dentistry, Oral Surgery & Medicine GA JE795 UT WOS:A1992JE79500003 PM 1437696 ER PT J AU BUTLER, FK HARRIS, DJ REYNOLDS, RD AF BUTLER, FK HARRIS, DJ REYNOLDS, RD TI ALTITUDE RETINOPATHY ON MOUNT EVEREST, 1989 SO OPHTHALMOLOGY LA English DT Article ID PHYSIOLOGY; SICKNESS AB The authors studied prospectively the incidence of and risk factors for high altitude retinal hemorrhages among 14 members of the 1989 American Everest Expedition. All subjects had comprehensive eye examinations and fundus photography performed at sea level before the expedition and again at the Mt. Everest Base Camp after 6 weeks of exposure to altitudes between 5300 and 8200 meters. Asymptomatic intraretinal hemorrhages were found in five eyes of four climbers. An additional eye of one of these climbers had a central retinal vein occlusion with vitreous hemorrhage, which reduced visual acuity to counting fingers. Higher baseline intraocular pressure and use of nonsteroidal anti-inflammatory drugs were found to be significant risk factors for development of altitude retinopathy. C1 UNIV TENNESSEE, MED CTR, KNOXVILLE, TN 37996 USA. NATL NAVAL MED CTR, DEPT OPHTHALMOL, BETHESDA, MD 20814 USA. USDA, BELTSVILLE HUMAN NUTR RES CTR, BELTSVILLE, MD 20705 USA. RP BUTLER, FK (reprint author), USN HOSP, DEPT OPHTHALMOL, PENSACOLA, FL 32512 USA. NR 14 TC 33 Z9 33 U1 0 U2 2 PU LIPPINCOTT-RAVEN PUBL PI PHILADELPHIA PA 227 EAST WASHINGTON SQ, PHILADELPHIA, PA 19106 SN 0161-6420 J9 OPHTHALMOLOGY JI Ophthalmology PD MAY PY 1992 VL 99 IS 5 BP 739 EP 746 PG 8 WC Ophthalmology SC Ophthalmology GA HU975 UT WOS:A1992HU97500026 PM 1594220 ER PT J AU PURDY, AP GEORGE, CF AF PURDY, AP GEORGE, CF TI SYNTHESIS AND STRUCTURE OF ALKALI-METAL TRIORGANOZINCATES SO ORGANOMETALLICS LA English DT Note ID MAIN GROUP ELEMENTS; ORGANOMETALLIC COMPOUNDS; AROMATIC-HYDROCARBONS; MOLECULAR-STRUCTURES; CRYSTAL-STRUCTURE; ZN AB The potassium and sodium trialkylzincates KZn(CH2CMe3)3 (1), NaZn(CH2CMe3)3 (2), and KZn(CH2SiMe3)3 (3) were isolated from reactions between the alkali metal and R2Zn in benzene. The compounds all metalate benzene, and in fact KZn(CH2SiMe3)2Ph (4) was isolated during the synthesis of 3. The crystal structures of 1-4 show all four complexes to consist of ZnR3- and K+ or Na+ ions. Potassium ions in 4 join the ZnR3- ions into a polymeric lattice, while 1-3 crystallize as discrete dimers. The K+ ions in 1 are solvated with weakly coordinated benzene, while the Na+ ions in 2 and the K+ ions in 3 have weak contacts outside the dimeric unit. Only the Na complex 2 sublimes under vacuum. C1 LAB STRUCT MATTER,WASHINGTON,DC 20375. RP PURDY, AP (reprint author), USN,RES LAB,DIV CHEM,CODE 6120,WASHINGTON,DC 20375, USA. NR 21 TC 42 Z9 42 U1 0 U2 4 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0276-7333 J9 ORGANOMETALLICS JI Organometallics PD MAY PY 1992 VL 11 IS 5 BP 1955 EP 1959 DI 10.1021/om00041a030 PG 5 WC Chemistry, Inorganic & Nuclear; Chemistry, Organic SC Chemistry GA HT861 UT WOS:A1992HT86100030 ER PT J AU JOYNER, D AF JOYNER, D TI SIMPLE LOCAL TRACE FORMULAS FOR UNRAMIFIED P-ADIC GROUPS SO PACIFIC JOURNAL OF MATHEMATICS LA English DT Article AB Let G be a connected unramified semi-simple group over a p-adic field F. In this note, we compute a (Macdonald-)Plancherel-type formula: integral-G(F)xG(F) f(h)phi(g-1hg) dg dh = integral f(V)(chi)I(chi, phi) d-mu(chi). Here f is a spherical function, f(V) is its Satake transform, and phi is a smooth function supported on the elliptic set. For this, we use the Geometrical Lemma of Bernstein and Zelevinsky, Macdonald's Plancherel formula, Macdonald's formula for the spherical function, results of Casselman on intertwining operators of the unramified series, and a combinatorial lemma of Arthur. This derivation follows a procedure of Waldspurger rather closely, where the case of GL(n) was worked out in detail. We may rewrite this formula as integral-G(F)f(g-1-gamma-g) dg = integral f(V)(chi)I(chi, gamma) d-mu(chi), for gamma elliptic regular in G(F) and f spherical. Here I(chi, gamma) is a distribution on the support of the Plancherel measure (regarded as a compact complex analytic variety). RP JOYNER, D (reprint author), USN ACAD,ANNAPOLIS,MD 21402, USA. NR 13 TC 0 Z9 0 U1 0 U2 0 PU PACIFIC JOURNAL MATHEMATICS PI BERKELEY PA PO BOX 4163, BERKELEY, CA 94704-0163 SN 0030-8730 J9 PAC J MATH JI Pac. J. Math. PD MAY PY 1992 VL 154 IS 1 BP 103 EP 129 PG 27 WC Mathematics SC Mathematics GA HM992 UT WOS:A1992HM99200006 ER PT J AU YU, HY SANDAY, SC RATH, BB AF YU, HY SANDAY, SC RATH, BB TI THERMOELASTIC STRESSES IN BIMATERIALS SO PHILOSOPHICAL MAGAZINE A-PHYSICS OF CONDENSED MATTER STRUCTURE DEFECTS AND MECHANICAL PROPERTIES LA English DT Article AB The recently developed solution of the elastic equations for a bimaterial with an inclusion is used to study the fundamental thermoplastic problem in dissimilar media. The dissimilar medium consists of two semi-infinite isotropic solids of different elastic properties either perfectly bonded together or in frictionless contact with each other at the planar interface. The solutions are obtained by a method which is based on the integration of properly weighted centres of dilatation over the volume occupied by the body. The potential functions for the problem solved are the harmonic potential function of attracting matter filling the element of volume, which is identical to that for the solid of indefinite extent as in Goodier's theory of thermoelastic stress, and its mirror image. The results are applied to the case of an expanding (or contracting) inclusion of any shape embedded in one of the semi-infinite solids near the planar boundary. Numerical results for a spherical inclusion with pure dilatational eigenstrain are presented as an example. RP YU, HY (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 21 TC 29 Z9 30 U1 0 U2 0 PU TAYLOR & FRANCIS LTD PI LONDON PA ONE GUNDPOWDER SQUARE, LONDON, ENGLAND EC4A 3DE SN 0141-8610 J9 PHILOS MAG A JI Philos. Mag. A-Phys. Condens. Matter Struct. Defect Mech. Prop. PD MAY PY 1992 VL 65 IS 5 BP 1049 EP 1064 PG 16 WC Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering; Physics, Applied; Physics, Condensed Matter SC Materials Science; Metallurgy & Metallurgical Engineering; Physics GA HX881 UT WOS:A1992HX88100003 ER PT J AU LIN, HB EVERSOLE, JD MERRITT, CD CAMPILLO, AJ AF LIN, HB EVERSOLE, JD MERRITT, CD CAMPILLO, AJ TI CAVITY-MODIFIED SPONTANEOUS-EMISSION RATES IN LIQUID MICRODROPLETS SO PHYSICAL REVIEW A LA English DT Article ID INHIBITED SPONTANEOUS EMISSION; DIELECTRIC MICROSPHERES; OPTICAL CAVITIES; RESONANCES; ATOMS; SCATTERING AB We observe significant lifetime modification (both reduction and lengthening) of 610-620-nm light spontaneously emitted by chelated europium ions in 10-mu-m-diam dimethylformamide-alcohol solution droplets. The enhancement or inhibition of the Einstein A coefficient over the familiar free-space value is direct evidence of cavity quantum-electrodynamic effects taking place in microdroplets. C1 POTOMAC PHOTON INC,LANHAM,MD 20706. RP LIN, HB (reprint author), USN,RES LAB,LASER PHYS BRANCH,WASHINGTON,DC 20375, USA. NR 28 TC 98 Z9 99 U1 1 U2 9 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1050-2947 J9 PHYS REV A JI Phys. Rev. A PD MAY 1 PY 1992 VL 45 IS 9 BP 6756 EP 6760 DI 10.1103/PhysRevA.45.6756 PG 5 WC Optics; Physics, Atomic, Molecular & Chemical SC Optics; Physics GA HT733 UT WOS:A1992HT73300072 ER PT J AU SWANEKAMP, SB HOLLOWAY, JP KAMMASH, T GILGENBACH, RM AF SWANEKAMP, SB HOLLOWAY, JP KAMMASH, T GILGENBACH, RM TI THE THEORY AND SIMULATION OF RELATIVISTIC ELECTRON-BEAM TRANSPORT IN THE ION-FOCUSED REGIME SO PHYSICS OF FLUIDS B-PLASMA PHYSICS LA English DT Article ID LONG-PULSE; CHANNELS; PROPAGATION; INSTABILITY AB Several recent experiments involving relativistic electron beam (REB) transport in plasma channels show two density regimes for efficient transport; a low-density regime known as the ion-focused regime (IFR) and a high-pressure regime. The results obtained in this paper use three separate models to explain the dependency of REB transport efficiency on the plasma density in the IFR. Conditions for efficient beam transport are determined by examining equilibrium solutions of the Vlasov-Maxwell equations under conditions relevant to IFR transport. The dynamic force balance required for efficient IFR transport is studied using the particle-in-cell (PIC) method. These simulations provide new insight into the transient beam front physics as well as the dynamic approach to IFR equilibrium. Nonlinear solutions to the beam envelope are constructed to explain oscillations in the beam envelope observed in the PIC simulations but not contained in the Vlasov equilibrium analysis. A test particle analysis is also developed as a method to visualize equilibrium solutions of the Vlasov equation. This not only provides further insight into the transport mechanism but also illustrates the connections between the three theories used to describe IFR transport. Separately these models provide valuable information about transverse beam confinement; together they provide a clear physical understanding of REB transport in the IFR. C1 UNIV MICHIGAN,DEPT NUCL ENGN,ANN ARBOR,MI 48109. RP SWANEKAMP, SB (reprint author), USN,RES LAB,DIV PLASMA PHYS,WASHINGTON,DC 20375, USA. NR 38 TC 31 Z9 32 U1 0 U2 0 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0899-8221 J9 PHYS FLUIDS B-PLASMA PD MAY PY 1992 VL 4 IS 5 BP 1332 EP 1348 DI 10.1063/1.860088 PG 17 WC Physics, Fluids & Plasmas SC Physics GA HR929 UT WOS:A1992HR92900026 ER PT J AU SOM, BK DASGUPTA, B PATEL, VL GUPTA, MR AF SOM, BK DASGUPTA, B PATEL, VL GUPTA, MR TI NONLINEAR EVOLUTION OF ALFVEN WAVES IN A FINITE BETA-PLASMA - REPLY SO PHYSICS OF FLUIDS B-PLASMA PHYSICS LA English DT Note C1 SAHA INST NUCL PHYS,CALCUTTA 700009,W BENGAL,INDIA. USN,RES LAB,WASHINGTON,DC 20375. UNIV CALCUTTA,CTR ADV STUDIES APPL MATH,CALCUTTA 700009,W BENGAL,INDIA. RP SOM, BK (reprint author), BK GIRLS COLL,DEPT PHYS,W BENGAL,INDIA. NR 3 TC 1 Z9 1 U1 0 U2 0 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0899-8221 J9 PHYS FLUIDS B-PLASMA PD MAY PY 1992 VL 4 IS 5 BP 1372 EP 1372 DI 10.1063/1.860093 PG 1 WC Physics, Fluids & Plasmas SC Physics GA HR929 UT WOS:A1992HR92900033 ER PT J AU BOOK, DL AF BOOK, DL TI CONVECTIVE STABILIZATION OF THE RAYLEIGH-TAYLOR INSTABILITY WITH SELF-CONSISTENT TREATMENT OF BOUNDARY-CONDITIONS SO PLASMA PHYSICS AND CONTROLLED FUSION LA English DT Article ID COMPRESSIBILITY; ABLATION; PLASMA AB Motivated by the phenomena that occur at the ablation front of a laser-driven target, a theory of the convective stabilization of the Rayleigh-Taylor instability is derived which is applicable for wavelengths that are long compared with the density-gradient scale length. Thermal conduction processes are not treated. The system of linearized equations is closed by assuming that the density jump is some unspecified function-of the hydrodynamic and transport variables and linearizing this relationship. The resulting growth rates are closer to those given by the Takabe formula than the results of previous analytical theories that include convection but neglect thermal conduction. C1 USN,RES LAB,COMPUTAT PHYS & FLUID DYNAM LAB,CODE 4405,WASHINGTON,DC 20375. NR 11 TC 10 Z9 10 U1 0 U2 0 PU IOP PUBLISHING LTD PI BRISTOL PA TECHNO HOUSE, REDCLIFFE WAY, BRISTOL, ENGLAND BS1 6NX SN 0741-3335 J9 PLASMA PHYS CONTR F JI Plasma Phys. Control. Fusion PD MAY PY 1992 VL 34 IS 5 BP 737 EP 747 DI 10.1016/0741-3335(92)90064-D PG 11 WC Physics, Fluids & Plasmas SC Physics GA HR358 UT WOS:A1992HR35800007 ER PT J AU THORNTON, SA AF THORNTON, SA TI USE OF DIFFERENTIAL AGAR MEDIA FOR DETECTION OF CLONED DNA FRAGMENTS IN THE TETRACYCLINE AND CHLORAMPHENICOL RESISTANCE GENES OF PBR322 SO PLASMID LA English DT Article RP THORNTON, SA (reprint author), USN,MED RES UNIT 3,CAIRO,EGYPT. NR 4 TC 0 Z9 0 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 0147-619X J9 PLASMID JI Plasmid PD MAY PY 1992 VL 27 IS 3 BP 177 EP 180 DI 10.1016/0147-619X(92)90019-7 PG 4 WC Genetics & Heredity; Microbiology SC Genetics & Heredity; Microbiology GA HR927 UT WOS:A1992HR92700002 PM 1513875 ER PT J AU KAUR, M HYAMS, KC PURDY, MA KRAWCZYNSKI, K CHING, WM FRY, KE REYES, GR BRADLEY, DW CARL, M AF KAUR, M HYAMS, KC PURDY, MA KRAWCZYNSKI, K CHING, WM FRY, KE REYES, GR BRADLEY, DW CARL, M TI HUMAN LINEAR B-CELL EPITOPES ENCODED BY THE HEPATITIS-E VIRUS INCLUDE DETERMINANTS IN THE RNA-DEPENDENT RNA-POLYMERASE SO PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA LA English DT Article DE HEPATITIS-E VIRUS; B-CELL EPITOPES; SYNTHETIC PEPTIDES; RNA-DEPENDENT RNA POLYMERASE; NONSTRUCTURAL PROTEINS ID TRANSMITTED NON-A; EPIDEMIC NON-A; RECOVERY AB Hepatitis E virus is responsible for both sporadic and epidemic hepatitis in developing countries. The nonenveloped virus is 27-34 nm in diameter and has been shown to contain a single-strand, positive-sense, polyadenylylated RNA genome of almost-equal-to 7.5 kilobases. The nucleotide sequence of the Burma strain of hepatitis E virus has been reported and three open reading frames (ORFs) have been identified. The deduced amino acid sequence from each of these ORFs was used to synthesize overlapping peptides (decamers overlapping at every fourth amino acid) on a solid phase. These peptides were then tested in an ELISA with pooled acute-phase sera from known cases of enterically transmitted non-A, non-B hepatitis collected in the Sudan. Linear B-cell epitopes were identified in all three ORFs. Epitopes were identified throughout the polyprotein encoded by ORF1, but they appeared to be particularly concentrated in the region of the RNA-dependent RNA polymerase. Distinct epitopes were identified in the presumed structural protein encoded by ORF2, and one epitope was identified close to the carboxyl terminus of the protein encoded by ORF3. These data precisely pinpoint linear B-cell epitopes recognized by antibodies from patients with acute hepatitis E and identify an antibody response directed against the RNA-dependent RNA polymerase. C1 USN,MED RES INST,ACCELERATED PROD DEV & INFECT DIS THREAT ASSESSMENT,BETHESDA,MD 20814. GENELABS INC,DEPT MOLEC VIROL,REDWOOD CITY,CA 94063. CTR DIS CONTROL,DIV VIRAL DIS,HEPATITIS BRANCH,ATLANTA,GA 30333. NR 26 TC 46 Z9 52 U1 1 U2 2 PU NATL ACAD PRESS 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 MAY 1 PY 1992 VL 89 IS 9 BP 3855 EP 3858 DI 10.1073/pnas.89.9.3855 PG 4 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA HR853 UT WOS:A1992HR85300038 PM 1373890 ER PT J AU QUINN, SF SCHUMAN, ES HALL, L GROSS, GF UCHIDA, BT STANDAGE, BA ROSCH, J IVANCEV, K AF QUINN, SF SCHUMAN, ES HALL, L GROSS, GF UCHIDA, BT STANDAGE, BA ROSCH, J IVANCEV, K TI VENOUS STENOSES IN PATIENTS WHO UNDERGO HEMODIALYSIS - TREATMENT WITH SELF-EXPANDABLE ENDOVASCULAR STENTS SO RADIOLOGY LA English DT Article DE INTERVENTIONAL PROCEDURES; PROSTHESES; VEINS, INNOMINATE; VEINS, STENOSIS OR OBSTRUCTION ID TRANS-LUMINAL ANGIOPLASTY; VASCULAR ACCESS; DIALYSIS SHUNTS; FISTULAS; GRAFTS; EXPERIENCE; RATES AB During a 32-month period, 25 modified self-expandable endovascular stents were placed in 20 hemodialysis access sites to treat 21 stenoses and four occlusions in 19 patients. All stenoses were initially dilated with a high-pressure balloon. The initial success rate was 90% (18 of 20 access sites). The stents were patent from 0 to 960 days (mean duration of follow-up, 309 days). At 2 years follow-up, the patency rates were as follows: primary, 25%; secondary, 34%; and tertiary, 42%. The morbidity rate associated with this procedure was 15% (three of 20 sites); the mortality rate, 5% (one of 19 patients). All five complications (graft or native-vein thrombosis [n = 2], nerve deficits [n = 21, and death secondary to sepsis [n = 11) occurred in three patients early in the study, before the use of prophylactic antibiotics and refinements in technique. The best results occurred in patients in whom the stenosis or occlusion affected a large vein that had no acute angle and was away from venous confluences such as the femoral and iliac regions. C1 GOOD SAMARITAN HOSP,DEPT SURG,PORTLAND,OR 97210. UNIV LUND HOSP,DEPT RADIOL,S-22185 LUND,SWEDEN. USN HOSP,DEPT RADIOL,SAN DIEGO,CA 92134. OREGON HLTH SCI UNIV,DEPT RADIOL,PORTLAND,OR 97201. OREGON HLTH SCI UNIV,DEPT SURG,PORTLAND,OR 97201. OREGON HLTH SCI UNIV,CHARLES DOTTER INST INTERVENT THERAPY,PORTLAND,OR 97201. RP QUINN, SF (reprint author), GOOD SAMARITAN HOSP,DEPT RADIOL,1015 NW 22ND ST,PORTLAND,OR 97210, USA. NR 17 TC 79 Z9 79 U1 0 U2 0 PU RADIOLOGICAL SOC NORTH AMER PI EASTON PA 20TH AND NORTHAMPTON STS, EASTON, PA 18042 SN 0033-8419 J9 RADIOLOGY JI Radiology PD MAY PY 1992 VL 183 IS 2 BP 499 EP 504 PG 6 WC Radiology, Nuclear Medicine & Medical Imaging SC Radiology, Nuclear Medicine & Medical Imaging GA HQ884 UT WOS:A1992HQ88400035 PM 1561357 ER PT J AU SPILLANE, WF AF SPILLANE, WF TI 3-IN-1 BLOCKS AND CONTINUOUS 3-IN-1 BLOCKS SO REGIONAL ANESTHESIA LA English DT Letter RP SPILLANE, WF (reprint author), USN HOSP,DEPT ANESTHESIOL,PAIN SERV,SAN DIEGO,CA 92134, USA. NR 0 TC 10 Z9 12 U1 0 U2 0 PU CHURCHILL LIVINGSTONE INC MEDICAL PUBLISHERS PI NEW YORK PA 650 AVENUE OF THE AMERICAS, NEW YORK, NY 10011 SN 0146-521X J9 REGION ANESTH JI Reg. Anesth. PD MAY-JUN PY 1992 VL 17 IS 3 BP 175 EP 176 PG 2 WC Anesthesiology SC Anesthesiology GA HW980 UT WOS:A1992HW98000011 PM 1606102 ER PT J AU KIM, CC RACCAH, PM GARLAND, JW AF KIM, CC RACCAH, PM GARLAND, JW TI THE IMPROVEMENT OF PHASE MODULATED SPECTROSCOPIC ELLIPSOMETRY SO REVIEW OF SCIENTIFIC INSTRUMENTS LA English DT Article ID OPTICAL-PROPERTIES; GAAS; GROWTH AB Spectroscopic ellipsometry using photoelastic modulator [phase modulated spectroscopic ellipsometry (PMSE)] has been improved in the spectral range. Spectroscopic ellipsometry using the rotating analyzer [rotating analyzer spectroscopic ellipsometry (RASE)] has demonstrated its capability of measuring the reflectivity ratio, rho(omega), from 1.5 to 6 eV with a single scan, but PMSE has not been able to do so. We demonstrate that PMSE also can measure rho(omega) from 1.5 to 6 eV with a single scan. We discuss the problems and show their solutions to achieve this goal. We also discuss the accuracy of our PMSE by comparing the spectral data by RASE with those by our PMSE. We find that the simplest possible procedure with our system provides reasonably accurate values, after including the zone average which is easy to perform with our system. The extension of the spectral range is a decisive advantage, especially in studying the E1 structure of the wide band gap materials such as ZnSe. C1 UNIV ILLINOIS,DEPT PHYS,CHICAGO,IL 60680. RP KIM, CC (reprint author), USN,RES LAB,DYNAM SOLIDS BRANCH,M-C 4683,WASHINGTON,DC 20375, USA. NR 25 TC 17 Z9 17 U1 0 U2 0 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0034-6748 J9 REV SCI INSTRUM JI Rev. Sci. Instrum. PD MAY PY 1992 VL 63 IS 5 BP 2958 EP 2966 DI 10.1063/1.1142593 PG 9 WC Instruments & Instrumentation; Physics, Applied SC Instruments & Instrumentation; Physics GA HR942 UT WOS:A1992HR94200009 ER PT J AU KALU, PN MCNELLEY, TR AF KALU, PN MCNELLEY, TR TI ELEVATED-TEMPERATURE DEFORMATION AND FRACTURE CHARACTERISTICS OF A THERMOMECHANICALLY PROCESSED 6061 AL-AL2O3 COMPOSITE SO SCRIPTA METALLURGICA ET MATERIALIA LA English DT Article ID METAL MATRIX COMPOSITES; ALUMINUM-ALLOY; SUPERPLASTICITY; REINFORCEMENT RP KALU, PN (reprint author), USN,POSTGRAD SCH,DEPT MECH ENGN,MONTEREY,CA 93940, USA. NR 19 TC 1 Z9 1 U1 0 U2 0 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0956-716X J9 SCRIPTA METALL MATER JI Scr. Metall. Materialia PD MAY 1 PY 1992 VL 26 IS 9 BP 1309 EP 1314 DI 10.1016/0956-716X(92)90640-Z PG 6 WC Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Materials Science; Metallurgy & Metallurgical Engineering GA HP023 UT WOS:A1992HP02300001 ER PT J AU CONSTANTINE, NT SCOTT, DA KAMAL, M ROBERTS, CR ROLFS, A SCHUMACHER, HC MARX, P AF CONSTANTINE, NT SCOTT, DA KAMAL, M ROBERTS, CR ROLFS, A SCHUMACHER, HC MARX, P TI TROPICAL SPASTIC PARAPARESIS ASSOCIATED WITH HTLV-1 IN EGYPT SO TRANSACTIONS OF THE ROYAL SOCIETY OF TROPICAL MEDICINE AND HYGIENE LA English DT Note ID VIRUS TYPE-I C1 ABBASSIA FEVER HOSP,CAIRO,EGYPT. WALTER REED ARMY MED CTR,WASHINGTON,DC 20307. FREE UNIV BERLIN,W-1000 BERLIN 33,GERMANY. RP CONSTANTINE, NT (reprint author), USN,MED RES UNIT 3,CAIRO,EGYPT. NR 11 TC 5 Z9 5 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 MAY-JUN PY 1992 VL 86 IS 3 BP 300 EP 301 DI 10.1016/0035-9203(92)90320-C PG 2 WC Public, Environmental & Occupational Health; Tropical Medicine SC Public, Environmental & Occupational Health; Tropical Medicine GA JD304 UT WOS:A1992JD30400029 PM 1412661 ER PT J AU SANCHEZ, JL CANDLER, WH FISHBEIN, DB GREENE, CR COTE, TR KELLY, DJ DRIGGERS, DP JOHNSON, BJB AF SANCHEZ, JL CANDLER, WH FISHBEIN, DB GREENE, CR COTE, TR KELLY, DJ DRIGGERS, DP JOHNSON, BJB TI A CLUSTER OF TICK-BORNE INFECTIONS - ASSOCIATION WITH MILITARY TRAINING AND ASYMPTOMATIC INFECTIONS DUE TO RICKETTSIA-RICKETTSII SO TRANSACTIONS OF THE ROYAL SOCIETY OF TROPICAL MEDICINE AND HYGIENE LA English DT Article ID LINKED IMMUNOSORBENT-ASSAY; LYME-DISEASE; EHRLICHIOSIS AB During the spring of 1989, 86 members of a military unit from the state of Maryland, USA, participated in two-week-long training manoeuvres in the states of Arkansas (location FC) and Virginia (location FAPD). Acute febrile illnesses due to infections with two tick-borne pathogens, Rickettsia rickettsii and Ehrlichia sp., were confirmed serologically in 2 initial cases who were admitted to the hospital. A seroepidemiological investigation among unit members found an additional 17 of 109 individuals (16%) with elevated post-exposure indirect immunofluorescent antibody (IFA) titres to R. rickettsii (16 cases) and/or E. canis (2 cases). The seropositivity rate of personnel who trained at FC was 38% (15 of 40), compared to only 13% (4 of 31) and 8% (3 of 38) of personnel who trained at FAPH or who did not train in the field, respectively (P<0.001). Seropositivity was associated with symptoms suggestive of a tick-borne illness. Only 4 (22%) and 6 (33%) of the 18 personnel seropositive for R. rickettsii reported an erythematous or petechial type of rash or a febrile illness, respectively, within 4 weeks of exposure; 5 of 18 (28%) personnel infected with R. rickettsii reported no symptoms and only 8 of 18 (44%) received medical treatment. Mild infections with R. rickettsii, or a closely related spotted fever group agent, may have accounted for the high infection rate experienced by this group. C1 MARYLAND STATE HLTH DEPT,EPIDEMIOL & DIS CONTROL PROGRAM,BALTIMORE,MD 21201. USN,MED RES INST,RICKETTSIAL DIS PROGRAM,BETHESDA,MD 20889. OFF ARMY SURGEON GEN,FALLS CHURCH,VA 22041. CTR DIS CONTROL,DIV VECTOR BORNE INFECT DIS,FT COLLINS,CO 80522. CTR DIS CONTROL,DIV VIRAL & RICKETTSIAL DIS,ATLANTA,GA 30333. RP SANCHEZ, JL (reprint author), WALTER REED ARMY MED CTR,DIV PREVENT MED,DEPT FIELD STUDIES,WASHINGTON,DC 20307, USA. NR 21 TC 36 Z9 37 U1 2 U2 2 PU ROYAL SOC TROPICAL MEDICINE PI LONDON PA MANSON HOUSE 26 PORTLAND PLACE, LONDON, ENGLAND W1N 4EY SN 0035-9203 J9 T ROY SOC TROP MED H JI Trans. Roy. Soc. Trop. Med. Hyg. PD MAY-JUN PY 1992 VL 86 IS 3 BP 321 EP 325 DI 10.1016/0035-9203(92)90330-F PG 5 WC Public, Environmental & Occupational Health; Tropical Medicine SC Public, Environmental & Occupational Health; Tropical Medicine GA JD304 UT WOS:A1992JD30400036 PM 1412666 ER PT J AU LIAO, SS MOORE, TP MACKEL, AG AF LIAO, SS MOORE, TP MACKEL, AG TI A TRANSPORTATION AND LOGISTIC SUPPORT MODEL FOR AIRCRAFT ABOARD NAVY CARRIERS SO TRANSPORTATION RESEARCH PART A-POLICY AND PRACTICE LA English DT Article AB The U.S. Navy's 13 carrier battle groups play a critical role in support of U.S. defense strategy. However, the mission of the combat aircraft aboard these aircraft carriers cannot be sustained unless they have sufficient transportation and logistic support. This paper describes the development of an econometric model of the transportation and logistic support system that keeps the carrier's combat aircraft flying. RP LIAO, SS (reprint author), USN,POSTGRAD SCH,DEPT ADM SCI,MONTEREY,CA 93943, USA. NR 21 TC 0 Z9 0 U1 0 U2 1 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0965-8564 J9 TRANSPORT RES A-POL JI Transp. Res. Pt. A-Policy Pract. PD MAY PY 1992 VL 26 IS 3 BP 231 EP 245 DI 10.1016/0965-8564(92)90034-5 PG 15 WC Economics; Transportation; Transportation Science & Technology SC Business & Economics; Transportation GA HV827 UT WOS:A1992HV82700002 ER PT J AU MCDERMOTT, JJ DUTKA, AJ KOLLER, WA PEARSON, RR FLYNN, ET AF MCDERMOTT, JJ DUTKA, AJ KOLLER, WA PEARSON, RR FLYNN, ET TI COMPARISON OF 2 RECOMPRESSION PROFILES IN TREATING EXPERIMENTAL CEREBRAL AIR-EMBOLISM SO UNDERSEA BIOMEDICAL RESEARCH LA English DT Article DE RECOMPRESSION; CEREBRAL ISCHEMIA; SOMATOSENSORY EVOKED POTENTIAL; HYPERBARIC OXYGEN ID ARTERIAL GAS EMBOLISM; HYPERBARIC-OXYGEN AB The standard treatment for cerebral arterial gas embolism (CAGE) is an initial recompression to 6 atm abs on air for 30 min followed by oxygen breathing at 2.8 and 1.9 atm abs. It has been suggested that initial recompression to 2.8 atm abs on O2 may be as beneficial, thus avoiding potential treatment complications associated with the deeper depth. To test this hypothesis, we measured the recovery of the somatosensory evoked potential (SEP) following air embolism in anesthetized, ventilated cats. Air was infused into the carotid artery in increments of 0.08 ml until the SEP amplitude was reduced to less than 10% of the baseline value for 15 min. Three groups were studied. A control group (n = 10) received no further treatment after SEP suppression. The second group (6 atm abs/HBO] (n = 8) was compressed to 6 atm abs on air for 30 min followed by O2 breathing at 2.8 atm abs for 100 min. The third group (HBO) (n = 8) was compressed to 2.8 atm abs on O2 for 130 min. The control group recovered 28.8 +/- 18.2% (mean +/- SD) of the baseline amplitude, whereas the 6 atm abs/HBO group recovered 48.6 +/- 22.6%, and the HBO group recovered 62.0 +/- 20.3%. An analysis of variance revealed that only the HBO group had significantly (P < 0.01) better recovery than the control group. There was no significant difference in SEP recovery between the 2 treatment groups. These results suggest that treating CAGE at 2.8 atm abs with O2 is a viable alternative to the current therapy. C1 GEORGE WASHINGTON UNIV, SCH MED, DEPT PHYSIOL, WASHINGTON, DC 20037 USA. NATL NAVAL MED CTR, DEPT NEUROL, BETHESDA, MD 20889 USA. NATL NAVAL MED CTR, NAVAL MED RES & DEV COMMAND, BETHESDA, MD 20889 USA. RP MCDERMOTT, JJ (reprint author), USN, MED RES INST, DIVING BIOMED TECHNOL FUNCT AREA, BETHESDA, MD 20889 USA. NR 21 TC 12 Z9 12 U1 1 U2 1 PU UNDERSEA & HYPERBARIC MEDICAL SOC INC PI KENSINGTON PA 10531 METROPOLITAN AVE, KENSINGTON, MD 20895 SN 0093-5387 J9 UNDERSEA BIOMED RES PD MAY PY 1992 VL 19 IS 3 BP 171 EP 185 PG 15 WC Oceanography SC Oceanography GA HV437 UT WOS:A1992HV43700002 PM 1595138 ER PT J AU STEVENS, DM CARAS, BG FLYNN, ET DUTKA, AJ THORP, JW THALMANN, ED AF STEVENS, DM CARAS, BG FLYNN, ET DUTKA, AJ THORP, JW THALMANN, ED TI MANAGEMENT OF HERNIATED INTERVERTEBRAL DISKS DURING SATURATION DIVES - A CASE-REPORT SO UNDERSEA BIOMEDICAL RESEARCH LA English DT Article DE DECOMPRESSION SICKNESS; MORPHINE; INFLAMMATION; PREVIOUS INJURY; HERNIATED NUCLEUS PULPOSUS AB During research saturation dives at 5.0 and 5.5 atm abs, 2 divers developed an acute herniation of the nucleus pulposus of the L5-S1 intervertebral disk. In both cases the pain was severe enough to require intravenous morphine or intramuscular meperidine. Although the symptoms presented by these divers are frequently considered to be an indication for immediate surgical consultation, we decided that emergency decompression posed an unacceptable risk that decompression sickness (DCS) would develop in the region of acute inflammation. In both cases strict bedrest and medical therapy were performed at depth. In the first case, 12 h was spent at depth before initiating a standard U.S. Navy saturation decompression schedule with the chamber partial pressure of oxygen elevated to 0.50 atm abs. In the second case, a conservative He-N2-O2 trimix decompression schedule was followed to the surface. In both cases, no initial upward excursion was performed. The required decompression time was 57 h 24 min from 5.5 atm abs and 55 h 38 min from 5.0 atm abs. During the course of decompression, the first diver's neurologic exam improved and he required decreasing amounts of intravenous narcotic; we considered both to be evidence against DCS. The second diver continued to have pain and muscle spasm throughout decompression, however he did not develop motor, reflex, or sphincter abnormalities. Both divers have responded well to nonsurgical therapy. C1 USN,MED SUBMARINE RES LAB,GROTON,CT 06340. RP STEVENS, DM (reprint author), USN,MED RES INST,DIVING BIOMED TECHNOL FUNCT AREA,BETHESDA,MD 20814, USA. NR 3 TC 3 Z9 3 U1 1 U2 1 PU UNDERSEA & HYPERBARIC MEDICAL SOC INC PI KENSINGTON PA 10531 METROPOLITAN AVE, KENSINGTON, MD 20895 SN 0093-5387 J9 UNDERSEA BIOMED RES PD MAY PY 1992 VL 19 IS 3 BP 191 EP 198 PG 8 WC Oceanography SC Oceanography GA HV437 UT WOS:A1992HV43700004 PM 1534427 ER PT J AU LLOYD, JR OLSEN, RG AF LLOYD, JR OLSEN, RG TI RADIOFREQUENCY ENERGY FOR REWARMING OF COLD EXTREMITIES SO UNDERSEA BIOMEDICAL RESEARCH LA English DT Article DE RADIOFREQUENCY; HELICAL COILS; WARMING; HANDS; EXTREMITIES; FEET AB Radiofrequency (RF) coils, developed to resonate at 27.12 MHz, were evaluated for effectiveness in rewarming thermally unprotected extremities of 5 male subjects. Bare hands or bare feet were exposed to 10.0-degrees-C air during a total of four exposures for each subject. Deposition of RF energy for two of the exposures (one for the hands and one for the feet) began when a predetermined surface skin temperature was achieved. Rewarming continued for 10 min while fiber-optic sensors recorded surface skin temperatures at eight locations for each hand and four locations for each foot. Results were compared to data from identical exposures but without RF rewarming. Statistically significant (P < 0.01) warming occurred at all of the monitored locations. Our results clearly demonstrate the ability of RF energy to warm hands and feet in cold environments. RP LLOYD, JR (reprint author), USN,AEROSP MED RES LAB,RES DEPT,NAVAL AIR STN,PENSACOLA,FL 32508, USA. NR 9 TC 2 Z9 2 U1 0 U2 0 PU UNDERSEA & HYPERBARIC MEDICAL SOC INC PI KENSINGTON PA 10531 METROPOLITAN AVE, KENSINGTON, MD 20895 SN 0093-5387 J9 UNDERSEA BIOMED RES PD MAY PY 1992 VL 19 IS 3 BP 199 EP 207 PG 9 WC Oceanography SC Oceanography GA HV437 UT WOS:A1992HV43700005 PM 1595140 ER PT J AU GERASIMOWICZ, WV GARROWAY, AN MILLER, JB SANDER, LC AF GERASIMOWICZ, WV GARROWAY, AN MILLER, JB SANDER, LC TI MULTIPLE-QUANTUM NMR-STUDIES OF MONOMERIC BONDED SILICA PHASES SO JOURNAL OF PHYSICAL CHEMISTRY LA English DT Article ID LIQUID-CHROMATOGRAPHY; ORGANIZATION; SOLIDS AB Covalently modified, bonded silica phases have been characterized by proton multiple-quantum (MQ) nuclear magnetic resonance (NMR) spectrometry. In the case of trimethylsilyl bonded phases, the loading has been shown to be homogeneous in that MQ coherence development plateaus at a value of approximately 10 correlated protons. Thus, at room temperature the MQ-NMR spin "counting" result is consistent with the fact that trimethylsilyl groups have 9 protons. The groups are dispersed such that intermolecular dipolar interactions are minimal, and the protons of individual trimethyl groups are behaving collectively as isolated clusters. Similar results are presented for a C8 monomeric phase (at -101-degrees-C) where isolated clusters of approximately 25 protons have been detected, and 23 are seen on the individual groups of the C8 monomeric phase. The mobility of the alkyl chain has been shown to vary depending upon the structure of the immobilized ligand. At room temperature the mobility of the C8 alkyl chain groups reduces the dipolar interaction among its protons. Therefore, MQ-NMR was run at the lower temperature to limit molecular motion while enhancing proton dipolar coupling. C1 NATL INST STANDARDS & TECHNOL,DIV ORGAN ANALYT RES,GAITHERSBURG,MD 20899. USDA ARS,EASTERN REG RES CTR,PHILADELPHIA,PA 19118. RP GERASIMOWICZ, WV (reprint author), USN,RES LAB,DIV CHEM,CODE 6122,WASHINGTON,DC 20375, USA. NR 17 TC 7 Z9 7 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 APR 30 PY 1992 VL 96 IS 9 BP 3658 EP 3661 DI 10.1021/j100188a020 PG 4 WC Chemistry, Physical SC Chemistry GA HR490 UT WOS:A1992HR49000020 ER PT J AU PALMER, CA FARE, TL STENGER, DA SILVESTRE, CG CRIBBS, DH BEY, PP RUSIN, KM AF PALMER, CA FARE, TL STENGER, DA SILVESTRE, CG CRIBBS, DH BEY, PP RUSIN, KM TI ION CHANNEL TRANSDUCTION IN LANGMUIR-BLODGETT LIPID-MEMBRANES SO THIN SOLID FILMS LA English DT Article; Proceedings Paper CT 5TH INTERNATIONAL CONF ON LANGMUIR-BLODGETT FILMS CY AUG 26-30, 1991 CL PARIS, FRANCE ID VDAC AB Multilayers of phospholipid films with VDAC (voltage dependent anion channels) or acetylcholine receptors (AChR) have been deposited onto platinum electrodes using the Langmuir-Blodgett technique. Electrical properties of both suspended and platinum electrode-supported phospholipid bilayers containing VDAC were studied. For the VDAC-coated electrodes, the VDAC conductance decreased under appropriate biasing conditions due to the voltage sensitive nature of the protein. The response was asymmetric with respect to the polarity of the offset voltage, possibly the result of steric hindrance of the protein conformational changes by the electrode surface. Physical properties of AChR-lipid films were investigated at the air-water interface as a function of surface pressure. AChR-lipid films were transferred onto electrodes and the conductance of the electrodes was found to increase upon injection of carbamylcholine. Alternative methods for protein transfer onto the electrode have been considered. Stability and sensitivity of these films will be discussed with respect to biosensor development. C1 ST MARYS COLL,DEPT BIOL,ST MARYS CITY,MD 20686. GEOCENTERS INC,FT WASHINGTON,MD 20744. RP PALMER, CA (reprint author), USN,RES LAB,CTR BIOMOLEC ENGN,CODE 6090,WASHINGTON,DC 20375, USA. NR 8 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 0040-6090 J9 THIN SOLID FILMS JI Thin Solid Films PD APR 30 PY 1992 VL 210 IS 1-2 BP 707 EP 709 DI 10.1016/0040-6090(92)90380-T PG 3 WC Materials Science, Multidisciplinary; Materials Science, Coatings & Films; Physics, Applied; Physics, Condensed Matter SC Materials Science; Physics GA HV025 UT WOS:A1992HV02500081 ER PT J AU GEORGER, JH STENGER, DA RUDOLPH, AS HICKMAN, JJ DULCEY, CS FARE, TL AF GEORGER, JH STENGER, DA RUDOLPH, AS HICKMAN, JJ DULCEY, CS FARE, TL TI COPLANAR PATTERNS OF SELF-ASSEMBLED MONOLAYERS FOR SELECTIVE CELL-ADHESION AND OUTGROWTH SO THIN SOLID FILMS LA English DT Article; Proceedings Paper CT 5TH INTERNATIONAL CONF ON LANGMUIR-BLODGETT FILMS CY AUG 26-30, 1991 CL PARIS, FRANCE AB A recently developed deep UV photolithographic method produces high resolution (1-200-mu-m feature size) patterns of coplanar self-assembled monolayers (SAMs) which spatially control the adhesion and outgrowth of biological cells. Characterization of these patterned SAMs, using wettability, X-ray photoelectron spectroscopy (XPS), and scanning Auger electron spectroscopy (AES), shows that high resolution adjacent regions of intact SAMs are formed in the same molecular plane. Selective adhesion and outgrowth of neuroblastoma cells, explanted rat hippocampal cells, and human umbilical vein endothelial cells are demonstrated on these SAM patterns. Patterned SAMs might provide new approaches to the study of intercellular communication and development, and allow arrangement of cells on surfaces of sensor devices, prosthetic implants, or tissue repair templates. C1 USN,RES LAB,CTR BIOMOLEC SCI & ENGN,CODE 6090,WASHINGTON,DC 20375. NR 8 TC 24 Z9 24 U1 1 U2 3 PU ELSEVIER SCIENCE SA LAUSANNE PI LAUSANNE 1 PA PO BOX 564, 1001 LAUSANNE 1, SWITZERLAND SN 0040-6090 J9 THIN SOLID FILMS JI Thin Solid Films PD APR 30 PY 1992 VL 210 IS 1-2 BP 716 EP 719 DI 10.1016/0040-6090(92)90383-M PG 4 WC Materials Science, Multidisciplinary; Materials Science, Coatings & Films; Physics, Applied; Physics, Condensed Matter SC Materials Science; Physics GA HV025 UT WOS:A1992HV02500084 ER PT J AU CHEN, J YANG, CH WILSON, RA YANG, MJ AF CHEN, J YANG, CH WILSON, RA YANG, MJ TI OBSERVATION OF NEGATIVE PERSISTENT PHOTOCONDUCTIVITY IN AN N-CHANNEL GAAS/ALXGA1-XAS SINGLE HETEROJUNCTION SO APPLIED PHYSICS LETTERS LA English DT Article ID ALXGA1-XAS ALLOYS; GAAS; MOBILITIES AB We report the first observation of negative persistent photoconductivity at 4.2 K in an n-channel modulation doped GaAs/Al0.33Ga0.67As single heterostructure, where two-dimensional electrons have a mobility of approximately 550 000 cm2/V S when density is approximately 3.0 X 10(11) cm-2. Based on extensive magnetotransport measurements, we conclude that the negative persistent photoconductivity effect comes from the time dependence of (1) the annihilation of two-dimensional electrons by photoexcited holes, and (2) the trapping and de-trapping of photoexcited electrons by shallow donors in doped Al0.33Ga0.67As. A model that quantitatively explains the nonexponential recovery time is presented. C1 USN,RES LAB,WASHINGTON,DC 20375. RP CHEN, J (reprint author), UNIV MARYLAND,DEPT ELECT ENGN,JOINT PROGRAM ADV ELECTR MAT,COLLEGE PK,MD 20742, USA. NR 14 TC 11 Z9 11 U1 0 U2 2 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0003-6951 J9 APPL PHYS LETT JI Appl. Phys. Lett. PD APR 27 PY 1992 VL 60 IS 17 BP 2113 EP 2115 DI 10.1063/1.107106 PG 3 WC Physics, Applied SC Physics GA HQ500 UT WOS:A1992HQ50000024 ER PT J AU MOSHER, D COLOMBANT, D AF MOSHER, D COLOMBANT, D TI PINCH SPOT FORMATION IN HIGH ATOMIC NUMBER-Z DISCHARGES SO PHYSICAL REVIEW LETTERS LA English DT Article ID GENERATORS AB A nonlinear, quasi-two-dimensional model for pinch spot formation in radiation-dominated, high atomic number z pinches is presented that reproduces the experimental electrical and radiation characteristics. The high line-radiation rates of such discharges produce localized, high-density pinch spots in contrast to the spindle pinches predicted for hydrogenic discharges. RP MOSHER, D (reprint author), USN,RES LAB,DIV PLASMA PHYS,WASHINGTON,DC 20375, USA. NR 16 TC 20 Z9 20 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 APR 27 PY 1992 VL 68 IS 17 BP 2600 EP 2603 DI 10.1103/PhysRevLett.68.2600 PG 4 WC Physics, Multidisciplinary SC Physics GA HQ440 UT WOS:A1992HQ44000009 ER PT J AU KAFAFI, ZH BARTOLI, FJ LINDLE, JR PONG, RGS AF KAFAFI, ZH BARTOLI, FJ LINDLE, JR PONG, RGS TI LARGE INFRARED NONLINEAR OPTICAL-RESPONSE OF C-60 - COMMENT SO PHYSICAL REVIEW LETTERS LA English DT Letter RP KAFAFI, ZH (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. RI Lindle, James/A-9426-2009 NR 2 TC 65 Z9 66 U1 1 U2 3 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0031-9007 J9 PHYS REV LETT JI Phys. Rev. Lett. PD APR 27 PY 1992 VL 68 IS 17 BP 2705 EP 2705 DI 10.1103/PhysRevLett.68.2705 PG 1 WC Physics, Multidisciplinary SC Physics GA HQ440 UT WOS:A1992HQ44000038 ER PT J AU GOPALAKRISHNAN, GK BULMER, CH BURNS, WK MCELHANON, RW GREENBLATT, AS AF GOPALAKRISHNAN, GK BULMER, CH BURNS, WK MCELHANON, RW GREENBLATT, AS TI 40 GHZ, LOW HALF-WAVE VOLTAGE TILINBO3 INTENSITY MODULATOR SO ELECTRONICS LETTERS LA English DT Article DE OPTICAL MODULATION; ELECTROOPTICS AB A 5 V half-wave voltage (V(pi)) electro-optic Ti:LiNbO3 intensity modulator with a -7.5 dB (electrical) optical response at 40 GHz is demonstrated at 1.3-mu-m. A thick electrode structure is used in conjunction with a thin substrate to achieve a near optical-microwave phase match and a broadband electrical response. C1 MARYLAND ADV DEV LAB,GREENBELT,MD 20770. RP GOPALAKRISHNAN, GK (reprint author), USN,RES LAB,CODE 6571,WASHINGTON,DC 20375, USA. NR 6 TC 64 Z9 64 U1 0 U2 2 PU IEE-INST ELEC ENG PI HERTFORD PA MICHAEL FARADAY HOUSE SIX HILLS WAY STEVENAGE, HERTFORD, ENGLAND SG1 2AY SN 0013-5194 J9 ELECTRON LETT JI Electron. Lett. PD APR 23 PY 1992 VL 28 IS 9 BP 826 EP 827 DI 10.1049/el:19920522 PG 2 WC Engineering, Electrical & Electronic SC Engineering GA HR784 UT WOS:A1992HR78400011 ER PT J AU WILLIAMS, ER JONES, GC FANG, L ZARE, RN GARRISON, BJ BRENNER, DW AF WILLIAMS, ER JONES, GC FANG, L ZARE, RN GARRISON, BJ BRENNER, DW TI ION PICKUP OF LARGE, SURFACE-ADSORBED MOLECULES - A DEMONSTRATION OF THE ELEY-RIDEAL MECHANISM SO JOURNAL OF THE AMERICAN CHEMICAL SOCIETY LA English DT Article ID INDUCED DISSOCIATION; VIBRATIONAL-EXCITATION; MASS-SPECTROMETER; POLYATOMIC IONS; SOLID-SURFACES; METAL-SURFACE; COLLISIONS; ENERGY; HYDROCARBONS; DESORPTION AB Surface collisions of polycyclic aromatic hydrocarbon ions can be made to produce abundant pickup of large, surface-adsorbed species in a tandem time-of-flight mass spectrometer. Attachment of C1Hn-C6Hn to naphthalene and phenanthrene ions occurs with collision energies between 40 and 160 eV. Formation efficiency for these ion-adsorbate attachment reactions can be as high as 0.8%. Surface collisions produce no measurable shift in our flight times nor distortion in peak shapes for these species; this indicates the reaction time on the surface must be less than 160 ns. Theoretical calculations show that these reactions are direct (< 100 fs residence on the surface) and thus proceed by an Eley-Rideal mechanism. C1 STANFORD UNIV, DEPT CHEM, STANFORD, CA 94305 USA. PENN STATE UNIV, DEPT CHEM, UNIV PK, PA 16802 USA. USN, RES LAB, WASHINGTON, DC 20375 USA. RI Zare, Richard/A-8410-2009; Brenner, Donald/D-1741-2009; Williams, Evan/I-3924-2013 NR 30 TC 82 Z9 82 U1 1 U2 9 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0002-7863 J9 J AM CHEM SOC JI J. Am. Chem. Soc. PD APR 22 PY 1992 VL 114 IS 9 BP 3207 EP 3210 DI 10.1021/ja00035a006 PG 4 WC Chemistry, Multidisciplinary SC Chemistry GA HQ814 UT WOS:A1992HQ81400006 ER PT J AU BROZAK, G SHANABROOK, BV GAMMON, D BROIDO, DA BERESFORD, R WANG, WI AF BROZAK, G SHANABROOK, BV GAMMON, D BROIDO, DA BERESFORD, R WANG, WI TI INTERSUBBAND TRANSITIONS IN PIEZOELECTRIC SUPERLATTICES SO SURFACE SCIENCE LA English DT Article; Proceedings Paper CT 5TH INTERNATIONAL CONF ON MODULATED SEMICONDUCTOR STRUCTURES ( MSS-5 ) CY JUL 08-12, 1991 CL NARA, JAPAN SP YAMADA SCI FDN ID STRAINED-LAYER SUPERLATTICES; OPTICAL-PROPERTIES; QUANTUM-WELLS AB Charge-density and spin-density intersubband transitions of electrons in [100] and [111] GaSb/AlSb multiple quantum wells have been measured with inelastic light scattering. These measurements indicate that large built-in electric fields exist in the [111] oriented samples because of the piezoelectric effect. Furthermore, these built-in fields can be screened by the optical generation of an electron-hole plasma. C1 BOSTON COLL,CHESTNUT HILL,MA 02167. COLUMBIA UNIV,NEW YORK,NY 10027. RP BROZAK, G (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 9 TC 7 Z9 7 U1 0 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0039-6028 J9 SURF SCI JI Surf. Sci. PD APR 21 PY 1992 VL 267 IS 1-3 BP 120 EP 123 DI 10.1016/0039-6028(92)91103-I PG 4 WC Chemistry, Physical; Physics, Condensed Matter SC Chemistry; Physics GA HM901 UT WOS:A1992HM90100032 ER PT J AU DEVEAUD, B CHOMETTE, A ROY, N SERMAGE, B KATZER, DS AF DEVEAUD, B CHOMETTE, A ROY, N SERMAGE, B KATZER, DS TI OPTICAL CHARACTERIZATION OF THE INTERFACE IN GAAS/ALAS QUANTUM-WELLS SO SURFACE SCIENCE LA English DT Article; Proceedings Paper CT 5TH INTERNATIONAL CONF ON MODULATED SEMICONDUCTOR STRUCTURES ( MSS-5 ) CY JUL 08-12, 1991 CL NARA, JAPAN SP YAMADA SCI FDN ID NEAR-ATOMIC RESOLUTION; SEMICONDUCTOR INTERFACES; EXCITON TRANSFER; ISLANDS AB Luminescence, luminescence excitation as well as time resolved luminescence under resonant excitation are performed on high quality GaAs/AlAs quantum wells in order to assess the quality of the interface. The transfer from zones of a well defined thickness to zones larger by one monolayer is evidenced by selective excitation. C1 CTR NATL ETUD TELECOMMUN,F-92120 BAGNEUX,FRANCE. USN,RES LAB,WASHINGTON,DC 20375. RP DEVEAUD, B (reprint author), CTR NATL ETUD TELECOMMUN,F-22300 LANNION,FRANCE. RI Deveaud, Benoit/A-4782-2013; Katzer, D. Scott/N-7841-2013; Deveaud, Benoit/N-1947-2014 OI Deveaud, Benoit/0000-0002-9776-6314; Deveaud, Benoit/0000-0002-9776-6314 NR 21 TC 5 Z9 5 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0039-6028 J9 SURF SCI JI Surf. Sci. PD APR 21 PY 1992 VL 267 IS 1-3 BP 199 EP 203 DI 10.1016/0039-6028(92)91120-Z PG 5 WC Chemistry, Physical; Physics, Condensed Matter SC Chemistry; Physics GA HM901 UT WOS:A1992HM90100049 ER PT J AU EVERSOLE, JD LIN, HB CAMPILLO, AJ AF EVERSOLE, JD LIN, HB CAMPILLO, AJ TI CAVITY-MODE IDENTIFICATION OF FLUORESCENCE AND LASING IN DYE-DOPED MICRODROPLETS SO APPLIED OPTICS LA English DT Article DE MICRODROPLET FLUORESCENCE; MICRODROPLET LASING; OPTICAL CAVITY MODES; MORPHOLOGY-DEPENDENT RESONANCE IDENTIFICATION ID MORPHOLOGY-DEPENDENT RESONANCES; ELASTIC-SCATTERING; DIELECTRIC SPHERES; RAMAN-SCATTERING; MIE SCATTERING; LASER; PARTICLES; EMISSION; DROPLETS; SPECTRA AB Recent advances in an aerosol-generation technique have permitted the accurate identification of optical resonance-mode features of micrometer-sized freely falling droplets for several different optical processes. Both input and output resonant features of fluorescence and lasing from dye-doped microdroplets were assigned to specific spherical cavity modes by using two independent procedures: (1) by matching observed fixed-angle elastic laser light scattering as a function of droplet size to calculated scattering intensities from the Lorenz-Mie theory, and (2) by matching observed resonance peaks to computed cavity-mode positions by automated correlation. Agreement between these two complementary techniques establishes high confidence in the resulting mode identifications. Assignments of observed emission peaks provide insight into droplet-emission mechanisms. C1 USN,RES LAB,DIV OPT SCI,WASHINGTON,DC 20375. RP EVERSOLE, JD (reprint author), POTOMAC PHOTON INC,LANHAM,MD 20706, USA. NR 32 TC 38 Z9 38 U1 1 U2 6 PU OPTICAL SOC AMER PI WASHINGTON PA 2010 MASSACHUSETTS AVE NW, WASHINGTON, DC 20036 SN 0003-6935 J9 APPL OPTICS JI Appl. Optics PD APR 20 PY 1992 VL 31 IS 12 BP 1982 EP 1991 PG 10 WC Optics SC Optics GA HP607 UT WOS:A1992HP60700016 PM 20720847 ER PT J AU MCKENZIE, DL FELDMAN, U AF MCKENZIE, DL FELDMAN, U TI VARIATIONS IN THE RELATIVE ELEMENTAL ABUNDANCES OF OXYGEN, NEON, MAGNESIUM, AND IRON IN HIGH-TEMPERATURE SOLAR ACTIVE-REGION AND FLARE PLASMAS SO ASTROPHYSICAL JOURNAL LA English DT Article DE SUN ABUNDANCES; SUN CORONA; SUN FLARES; SUN X-RAYS, GAMMA-RAYS ID ELECTRON-IMPACT EXCITATION; HELIUM-LIKE IONS; GROUND-STATE; SPECTRUM; ATMOSPHERE; SKYLAB AB We have used X-ray spectral line ratios that are weakly dependent upon temperature to search for evidence of elemental abundance variations in the solar corona. Using spectral lines from Ne IX, O VIII, Fe XVII, Fe XVIII, and Mg XI, we found evidence for Fe/Ne abundance-ratio variations of more than a factor of 4, Fe/O abundance-ratio variations of factors of 2.4-3.1, and O/Ne abundance-ratio variations of approximately a factor of 2. These last variations are the first seen for the abundance ratio of two elements in the "high-FIP" group (those having first ionization potential-FIP-greater than 10 eV). We found no evidence for abundance-ratio variations for Fe and Mg, two low-FIP elements, but the statistics are such that variations as large as a factor of 1.5 cannot be ruled out. The data suggest that a mechanism that favors the promotion of charged species to the corona is operative in the upper chromosphere at a temperature of approximately 1.5 x 10(4) K. The strength of the bias varies both temporally and spatially. We argue that the minimum low-FIP/high-FIP abundance ratios that we observe can be no lower than the photospheric ratios. On this basis, we suggest that the abundance of iron in the photosphere corresponds to that measured in C1 chondrites rather than the higher value obtained by spectroscopic techniques. C1 USN,RES LAB,EO HULBURT CTR SPACE RES,WASHINGTON,DC 20375. RP MCKENZIE, DL (reprint author), AEROSPACE CORP,CTR SPACE & ENVIRONM TECHNOL,M2-266,POB 92957,LOS ANGELES,CA 90009, USA. NR 31 TC 61 Z9 61 U1 0 U2 0 PU UNIV CHICAGO PRESS PI CHICAGO PA 5720 S WOODLAWN AVE, CHICAGO, IL 60637 SN 0004-637X J9 ASTROPHYS J JI Astrophys. J. PD APR 20 PY 1992 VL 389 IS 2 BP 764 EP 776 DI 10.1086/171249 PN 1 PG 13 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA HP119 UT WOS:A1992HP11900028 ER PT J AU TRITT, TM MARONE, M EHRLICH, AC SKOVE, MJ GILLESPIE, DJ JACOBSEN, RL TESSEMA, GX FRANCK, JP JUNG, J AF TRITT, TM MARONE, M EHRLICH, AC SKOVE, MJ GILLESPIE, DJ JACOBSEN, RL TESSEMA, GX FRANCK, JP JUNG, J TI EVIDENCE IN THE ELASTIC PROPERTIES FOR A STRESS-RELATED PHASE-TRANSITION IN THE HIGH-TC MATERIAL - BI2SR2CACU2OX SO PHYSICAL REVIEW LETTERS LA English DT Article ID CA-CU OXIDE; SUPERCONDUCTOR; TL2BA2CACU2O8; DIFFRACTION; CRYSTALS AB We have measured the stress-strain properties of whiskerlike samples of the high-T(c) material Bi2Sr2CaCu2Ox. We observe an anomalous temperature dependence of Young's modulus (Y) around 300 K. The magnitude of Y falls by a factor of 3-4 between 270 and 330 K. We also observe hysteresis in the stress-strain curves in this same temperature range. The stress and strain relax toward the middle of the hysteresis loop with a characteristic time of approximately 20 sec. All these phenomena are reproducible as either the stress or temperature is cycled. C1 CLEMSON UNIV,DEPT PHYS,CLEMSON,SC 29634. UNIV ALBERTA,DEPT PHYS,EDMONTON T6G 21J,ALBERTA,CANADA. RP TRITT, TM (reprint author), USN,RES LAB,MAT PHYS BRANCH,WASHINGTON,DC 20375, USA. NR 33 TC 21 Z9 21 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 APR 20 PY 1992 VL 68 IS 16 BP 2531 EP 2534 DI 10.1103/PhysRevLett.68.2531 PG 4 WC Physics, Multidisciplinary SC Physics GA HP801 UT WOS:A1992HP80100032 ER PT J AU RICE, JK BARONAVSKI, AP AF RICE, JK BARONAVSKI, AP TI ULTRAFAST STUDIES OF SOLVENT EFFECTS IN THE ISOMERIZATION OF CIS-STILBENE SO JOURNAL OF PHYSICAL CHEMISTRY LA English DT Article ID RESOLVED MULTIPHOTON IONIZATION; POLYENE ELECTRONIC-STRUCTURE; PHOTO-ISOMERIZATION; TORSIONAL DYNAMICS; POLAR-SOLVENTS; TRANS-STILBENE; PHOTOISOMERIZATION; PICOSECOND; MOLECULES; ISOMERISM AB The ultrafast dynamic of cis-stilbene in solution are studied using a femtosecond pump-probe laser system. Excited-state lifetimes in n-hexane, tetradecane, methanol, 1,4-dioxane, and cyclohexane are examined following excitation at 312 nm. In addition, spectra of excited cis-stilbene within 500 fs of excitation are recorded using an optical multichannel analyzer (OMA). The lifetimes observed in n-hexane and tetradecane are in excellent agreement with literature values and correlate well with solvent bulk viscosity. The measured lifetimes in methanol, 1,4-dioxane, and cyclohexane do not correlate with solvent bulk viscosity. The lifetime in methanol is 0.50 +/- 0.03 ps, only slightly longer than the gas-phase value of 0.32 +/- 0.02 ps (Greene, B. I.; Farrow, R. C. J. Chem. Phys. 1983, 78, 3336-3338). The lifetime in 1,4-dioxane is similar to that of an alcohol of the same bulk viscosity. The lifetime in cyclohexane is much longer than lifetimes in linear alkanes of comparable viscosity. An examination of several probe wavelengths between 490 and 690 nm in several solvents reveals little or no wavelength dependence of the lifetime with the possible exception of cyclohexane. The cis-stilbene lifetime data in methanol and 1,4-dioxane suggests that microscopic solvent-solute interactions based on polarity are present and are larger than the bulk viscosity dependencies. The relatively slow cis- to trans-stilbene isomerization rate in cyclohexane may indicate a steric hindrance to isomerization. RP RICE, JK (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 39 TC 55 Z9 56 U1 0 U2 14 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0022-3654 J9 J PHYS CHEM-US JI J. Phys. Chem. PD APR 16 PY 1992 VL 96 IS 8 BP 3359 EP 3366 DI 10.1021/j100187a034 PG 8 WC Chemistry, Physical SC Chemistry GA HQ013 UT WOS:A1992HQ01300034 ER PT J AU HEWETT, CA ZEIDLER, JR AF HEWETT, CA ZEIDLER, JR TI ISSUES IN DIAMOND DEVICE FABRICATION SO DIAMOND AND RELATED MATERIALS LA English DT Article C1 USN, CTR OCEAN SYST, SAN DIEGO, CA 92152 USA. NR 9 TC 17 Z9 17 U1 0 U2 0 PU ELSEVIER SCIENCE SA PI LAUSANNE PA PO BOX 564, 1001 LAUSANNE, SWITZERLAND SN 0925-9635 J9 DIAM RELAT MATER JI Diam. Relat. Mat. PD APR 15 PY 1992 VL 1 IS 5-6 BP 688 EP 691 DI 10.1016/0925-9635(92)90192-Q PG 4 WC Materials Science, Multidisciplinary SC Materials Science GA JE678 UT WOS:A1992JE67800056 ER PT J AU HOFFMAN, J HACK, GR CLARK, B AF HOFFMAN, J HACK, GR CLARK, B TI THE MAN DID FINE, BUT WHAT ABOUT THE WAHOO SO JAMA-JOURNAL OF THE AMERICAN MEDICAL ASSOCIATION LA English DT Letter C1 USN HOSP,LONG BEACH,CA. RP HOFFMAN, J (reprint author), USN HOSP,SAN DIEGO,CA 92134, USA. NR 15 TC 1 Z9 1 U1 0 U2 0 PU AMER MEDICAL ASSOC PI CHICAGO PA 515 N STATE ST, CHICAGO, IL 60610 SN 0098-7484 J9 JAMA-J AM MED ASSOC JI JAMA-J. Am. Med. Assoc. PD APR 15 PY 1992 VL 267 IS 15 BP 2039 EP 2039 DI 10.1001/jama.267.15.2039 PG 1 WC Medicine, General & Internal SC General & Internal Medicine GA HM650 UT WOS:A1992HM65000025 PM 1449546 ER PT J AU PELTZER, RD GRIFFIN, OM BARGER, WR KAISER, JAC AF PELTZER, RD GRIFFIN, OM BARGER, WR KAISER, JAC TI HIGH-RESOLUTION MEASUREMENT OF SURFACE-ACTIVE FILM REDISTRIBUTION IN SHIP WAKES SO JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS LA English DT Article ID WAVE TURBULENCE INTERACTIONS; WATER-WAVES; UPPER OCEAN AB Surface-active films are found in all parts of the ocean. They are easily detected visually on the ocean surface when the wind speed is less than 5 m/s (10 knot). They are generally of biological origin and consist mainly of fulvic and humic acids, carbohydrates, proteins, and lipids. Their molecules have hydrophilic (partially water soluble) heads and hydrophobic (insoluble carbon chain) tails. Surface-active films that have been concentrated at the edges of the centerline wake generated by the passage of a surface ship strongly influence the propagation of the short gravity and capillary waves which interact with electromagnetic waves at both radar and visible wavelengths. An accurate method for detecting the presence of surface films and measuring the fine-scale surface film pressure and surface elasticity distributions on a water surface was developed at the Naval Research Laboratory (NRL). These measurements, together with model-scale flow visualization experiments, have allowed us to develop a better understanding of the role these ship-generated surface-active film distributions play in the formation of the dark centerline and "railroad track" or dark lines which are aligned at some narrow angle to the ship's track in synthetic aperture radar (SAR) images of ship wakes. RP PELTZER, RD (reprint author), USN,RES LAB,CODE 4223,WASHINGTON,DC 20375, USA. NR 28 TC 33 Z9 37 U1 0 U2 3 PU AMER GEOPHYSICAL UNION PI WASHINGTON PA 2000 FLORIDA AVE NW, WASHINGTON, DC 20009 SN 0148-0227 J9 J GEOPHYS RES-OCEANS JI J. Geophys. Res.-Oceans PD APR 15 PY 1992 VL 97 IS C4 BP 5231 EP 5252 DI 10.1029/91JC01875 PG 22 WC Oceanography SC Oceanography GA HQ256 UT WOS:A1992HQ25600005 ER PT J AU FRYSINGER, GS ASHER, WE KORENOWSKI, GM BARGER, WR KLUSTY, MA FREW, NM NELSON, RK AF FRYSINGER, GS ASHER, WE KORENOWSKI, GM BARGER, WR KLUSTY, MA FREW, NM NELSON, RK TI STUDY OF OCEAN SLICKS BY NONLINEAR LASER PROCESSES .1. 2ND HARMONIC-GENERATION SO JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS LA English DT Article ID SURFACE-FILMS; CHEMICAL-STRUCTURE; SEA; MICROLAYER; ENRICHMENT; MOLECULES; PART AB Reflected optical second-harmonic generation (SHG) was applied for the first time to in situ study of the air-sea interface. SHG signals were detected from the first several molecular layers of the ocean surface during the SAR X Band Ocean Nonlinearities (SAXON) Chesapeake Light Tower experiment in 1988, and during experiments on Nantucket Sound at the Woods Hole Oceanographic Institution in 1989. The SHG response of the ocean surface was observed to correlate with increased slick activity and surface tension measurements of surface water organic content. The SHG response was similar for naturally occurring slicks and for artificially created slicks of several known materials. The SHG signal intensity was also used to estimate the second-order nonlinear optical susceptibility of the ocean surface. It was determined that the SHG nonlinear laser technique is a useful noninvasive probe for in situ studies of ocean surface chemistry. C1 RENSSELAER POLYTECH INST,DEPT CHEM,TROY,NY 12180. USN,RES LAB,DIV CHEM,WASHINGTON,DC 20375. WOODS HOLE OCEANOG INST,DEPT CHEM,WOODS HOLE,MA 02543. NR 33 TC 16 Z9 16 U1 0 U2 0 PU AMER GEOPHYSICAL UNION PI WASHINGTON PA 2000 FLORIDA AVE NW, WASHINGTON, DC 20009 SN 0148-0227 J9 J GEOPHYS RES-OCEANS JI J. Geophys. Res.-Oceans PD APR 15 PY 1992 VL 97 IS C4 BP 5253 EP 5269 DI 10.1029/91JC02125 PG 17 WC Oceanography SC Oceanography GA HQ256 UT WOS:A1992HQ25600006 ER PT J AU OCHADLICK, AR CHO, P EVANSMORGIS, J AF OCHADLICK, AR CHO, P EVANSMORGIS, J TI SYNTHETIC APERTURE RADAR OBSERVATIONS OF CURRENTS COLOCATED WITH SLICKS SO JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS LA English DT Article ID SURFACE AB During low wind conditions, our synthetic aperture radar (SAR) imagery of the ocean contains examples of strong perturbations in the geometry of persistent turbulent ship wakes at the intersection of wakes with dark slicklike features. The perturbations in the wakes are presumably caused by currents and are invariably colocated with slicklike submesoscale features. The current dynamics, influencing the geometry of turbulent wakes, are hypothesized to contribute to the efficient accretion of a biotic and abiotic microlayer in a localized surface zone, which is observed as a dark slick in our SAR imagery. Time displaced SAR imagery allows us to track the time evolution of the turbulent wake perturbations to determine the differential surface current responsible for the perturbations and to estimate the associated shear. In addition, the time displaced imagery also allows us to observe the temporal stability of the slicklike features. RP OCHADLICK, AR (reprint author), USN,CTR AIR DEV,CODE 5024,WARMINSTER,PA 18974, USA. NR 29 TC 16 Z9 18 U1 0 U2 2 PU AMER GEOPHYSICAL UNION PI WASHINGTON PA 2000 FLORIDA AVE NW, WASHINGTON, DC 20009 SN 0148-0227 J9 J GEOPHYS RES-OCEANS JI J. Geophys. Res.-Oceans PD APR 15 PY 1992 VL 97 IS C4 BP 5325 EP 5330 DI 10.1029/91JC01995 PG 6 WC Oceanography SC Oceanography GA HQ256 UT WOS:A1992HQ25600013 ER PT J AU SEMTNER, AJ CHERVIN, RM AF SEMTNER, AJ CHERVIN, RM TI OCEAN GENERAL-CIRCULATION FROM A GLOBAL EDDY-RESOLVING MODEL SO JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS LA English DT Article ID WORLD OCEAN; NORTH-ATLANTIC; INDIAN-OCEAN; WATER; TRANSPORT; RESOLUTION; CURRENTS; PACIFIC; EDDIES; DRIVEN AB A concerted effort has been made to simulate the global ocean circulation with resolved eddies, using a highly optimized model on the best available supercomputer. An earlier 20-year spin-up has been extended for 12.5 additional years: the first 2.5 with continued annual mean forcing and the final 10.0 with climatological monthly forcing. Model output archived at 3-day intervals has been analyzed into mean fields, standard deviations, products, and covariances on monthly, annual, and multiyear time scales. The multiyear results are examined here in order to give insight into the general circulation of the world ocean. The three-dimensional flow fields of the model are quite realistic, even though resolution of eddies in high latitudes is marginal with a 0.5-degrees, 20-level grid. The use of seasonal forcing improves the simulation, especially in the tropics and high northern latitudes. Mid-latitude gyre circulations, western boundary currents, zonal equatorial flows, and the Antarctic Circumpolar Current (ACC) all show mean and eddy characteristics similar to those observed. There is also some indication of eddy intensification of the mean flow of the ACC and of separated boundary jets. A global thermohaline circulation of North Atlantic Deep Water is identified in deep western boundary currents connected by the ACC. This deep circulation rises mainly in the equatorial Pacific. Several zonal jets are an integral part of this circulation near the equator, The deep flow rises toward the surface in a series of switchbacks. Much of the thermohaline return flow then follows an eddy-rich warm-water route through the Indonesian archipelago and around the southern tip of Africa. However, some intermediate level portions of the thermohaline circulation return south into the ACC and follow a cold water route through the Drake Passage. The representation of a global "conveyor belt" circulation with narrow and relatively high-speed currents along most of its path may be the most important result of this modeling study. Statistics of scalar fields such as transport stream function and surface height are exhibited, as are time series and frequency spectra of certain variables at selected points. These provide a baseline for comparison both with observations and with other model studies at higher resolution. Mean and eddy characteristics of the near-surface temperature and salinity fields are discussed, and surface forcing fields are examined. In particular, combined thermal and hydrological forcing effects are found to drive a conveyor belt circulation between the tropical Pacific and the high-latitude North Atlantic. The effect of weak restoring terms to observed temperature and salinity at great depth and in polar latitudes is found mainly to augment the model's convective processes, which are poorly resolved with 0.5-degrees grid spacing. However, the deep restoring terms are insignificant in both the tropics and the mid-latitudes. The geographical distributions of eddy heat and salt transport are discussed. The eddies transport heat and salt down the gradients and along the mean flow in many regions of strong currents. Net meridional transports of heat and salt by both the total currents and the eddies are computed for the Atlantic, the Indo-Pacific, and the global ocean. The total currents provide for poleward heat transport (except near 40-degrees-S, where the contribution from ACC instabilities is rather weak) and, in particular, for that needed to sustain the conveyor belt transport. Meridional eddy transports are especially important for warming the Pacific upwelting branch of the thermohaline circulation and for transporting salt across the equator into the North Pacific. Planned improvements to the model include a free-surface treatment of the barotropic mode and additions of the Arctic Basin and sea ice. A fully prognostic extension of the existing integration is intended, with subsequent transitioning of the model onto a 0.25-degrees grid having very realistic geometry. The 0.25-degrees version of the model will run effectively on newly available supercomputers. RP SEMTNER, AJ (reprint author), USN,POSTGRAD SCH,DEPT OCEANOG,MONTEREY,CA 93943, USA. NR 54 TC 414 Z9 422 U1 6 U2 37 PU AMER GEOPHYSICAL UNION PI WASHINGTON PA 2000 FLORIDA AVE NW, WASHINGTON, DC 20009 SN 0148-0227 J9 J GEOPHYS RES-OCEANS JI J. Geophys. Res.-Oceans PD APR 15 PY 1992 VL 97 IS C4 BP 5493 EP 5550 DI 10.1029/92JC00095 PG 58 WC Oceanography SC Oceanography GA HQ256 UT WOS:A1992HQ25600024 ER PT J AU KELLER, MR KELLER, WC PLANT, WJ AF KELLER, MR KELLER, WC PLANT, WJ TI A WAVE TANK STUDY OF THE DEPENDENCE OF X-BAND CROSS-SECTIONS ON WIND-SPEED AND WATER TEMPERATURE SO JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS LA English DT Article ID GENERATED WAVES; BREAKING WAVES; OCEAN; SEA; SCATTERING; SURFACE; EQUILIBRIUM; 13.9-GHZ; GROWTH; MODEL AB Measurements of normalized radar cross sections of wind-generated waves were made at X band for both vertical and horizontal polarization for incidence angles of 10-degrees, 28-degrees, 48-degrees, and 68-degrees. The study, conducted in the Naval Research Laboratory wind-wave facility, sought to measure effects on the backscatter of varying water temperature, wind speed, and wind stress. The cross-section measurements were averaged for 2.13 min simultaneously with wind speed and wind stress. Air and water temperature were measured periodically with mercury thermometers. The results were compared with the empirical model functions developed for the Seasat-A satellite scatterometer, SASS I, and SASS II, and with the physically based models of Durden and Vesecky, Plant, and Donelan and Pierson. In order to use the SASS I and SASS II models for these comparisons, differences between K(u) and X bands were assumed to be small; where possible, the other models were evaluated at X band. It was found that none of the models was consistently accurate at all wind speeds, incidence angles, and polarizations. Part of the inconsistency can be assigned to the fact that the models were developed for open ocean conditions with much higher sea states. however, Plant's model can easily be adjusted to account for this effect by using a relationship between mean squared slope and wind stress appropriate for tank conditions. When this was done, the model did fit the data better but the improvement was not dramatic. This indicates that inaccuracies in the models are probably due to other factors well. When plotted versus 19.5-m winds on a log-log scale, the measured cross sections do not fall on straight lines. Thus a power law dependence of cross section on wind speed is not a good representation of that relationship over our whole wind speed range. The data exhibit large variations at low wind speeds, however, which are not related to system noise. This may indicate that the statistics of backscatter depend markedly on wind speed. When these ow wind speed data were omitted, a power law was found to fit the remaining data rather well. Although the water temperature was varied from 9-degrees-C to 36-degrees-C when the measurements were made at a 48-degrees incidence angle, no temperature dependence was detectable above the low-wind-speed variability. The wave tank data compare well enough with 10 GHz, 3.0 cm (X band) aircraft measurements, and with the 14.6 GHz, 2.1 cm (K(u) band) satellite data used in the SASS II model to cast doubt on the hypothesis that cross section depends on antenna altitude. C1 WOODS HOLE OCEANOG INST, WOODS HOLE, MA 02543 USA. RP USN, RES LAB, WASHINGTON, DC 20375 USA. NR 60 TC 38 Z9 39 U1 0 U2 1 PU AMER GEOPHYSICAL UNION PI WASHINGTON PA 2000 FLORIDA AVE NW, WASHINGTON, DC 20009 USA SN 2169-9275 EI 2169-9291 J9 J GEOPHYS RES-OCEANS JI J. Geophys. Res.-Oceans PD APR 15 PY 1992 VL 97 IS C4 BP 5771 EP 5792 DI 10.1029/91JC03000 PG 22 WC Oceanography SC Oceanography GA HQ256 UT WOS:A1992HQ25600039 ER PT J AU SCHNEIDER, I AF SCHNEIDER, I TI F-AGGREGATE COLOR-CENTERS IN SODIUM-DOPED KI SO OPTICS LETTERS LA English DT Article ID (F2+)A CENTERS; LASER ACTION; KCL; STABILITY AB Data are presented for additively colored KI:Na, which identifies the (F2)A absorption and emission bands as peaking at 1.03 and 1.62-mu-m, respectively. These transitions differ from those previously attributed to this defect. (F2+)A centers also were produced and found to absorb near 1.52-mu-m and emit near 2.36-mu-m. The (F2+)A emission would be of interest for use in achieving tunable color-center laser action. RP SCHNEIDER, I (reprint author), USN,RES LAB,CODE 6570,WASHINGTON,DC 20375, USA. NR 13 TC 0 Z9 0 U1 0 U2 0 PU OPTICAL SOC AMER PI WASHINGTON PA 2010 MASSACHUSETTS AVE NW, WASHINGTON, DC 20036 SN 0146-9592 J9 OPT LETT JI Opt. Lett. PD APR 15 PY 1992 VL 17 IS 8 BP 616 EP 618 DI 10.1364/OL.17.000616 PG 3 WC Optics SC Optics GA HM730 UT WOS:A1992HM73000022 PM 19794576 ER PT J AU LU, ZM VALLIERES, M YUAN, JM HEAGY, JF AF LU, ZM VALLIERES, M YUAN, JM HEAGY, JF TI CONTROLLING CHAOTIC SCATTERING - IMPULSIVELY DRIVEN MORSE POTENTIAL SO PHYSICAL REVIEW A LA English DT Article ID CLASSICAL-THEORY; CHEMICAL-REACTIONS; MULTI-PHOTON; MULTIPHOTON DISSOCIATION; LASER EXCITATION; QUANTUM-THEORY; SIMPLE-MODEL; OSCILLATOR; ABSORPTION; DYNAMICS AB We investigate classical chaotic scattering between two atoms interacting via a Morse potential in the presence of a laser field. We find that stable resonance islands appear in phase space above the field-free dissociation energy in an impulsively driven model. A local expansion relating this model to the Henon map predicts the existence of such resonance islands within some finite domain in parameter space for any similar impulsively driven potential model. By switching on the external field during the collision we show how stable field-dressed molecules can be formed with energy above the field-free dissociation threshold. The experimental and quantum relevance of such phenomenon is discussed. C1 USN, CTR SURFACE WARFARE, SILVER SPRING, MD 20903 USA. RP DREXEL UNIV, DEPT PHYS & ATMOSPHER SCI, PHILADELPHIA, PA 19104 USA. NR 65 TC 18 Z9 19 U1 0 U2 0 PU AMER PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 2469-9926 EI 2469-9934 J9 PHYS REV A JI Phys. Rev. A PD APR 15 PY 1992 VL 45 IS 8 BP 5512 EP 5523 DI 10.1103/PhysRevA.45.5512 PG 12 WC Optics; Physics, Atomic, Molecular & Chemical SC Optics; Physics GA HQ038 UT WOS:A1992HQ03800030 ER PT J AU ESAREY, E SPRANGLE, P AF ESAREY, E SPRANGLE, P TI GENERATION OF STIMULATED BACKSCATTERED HARMONIC RADIATION FROM INTENSE-LASER INTERACTIONS WITH BEAMS AND PLASMAS SO PHYSICAL REVIEW A LA English DT Article ID FREE-ELECTRON LASERS; CHIRPED-PULSE AMPLIFICATION; WAKE-FIELD GENERATION; ELECTROMAGNETIC-WAVES; PARAMETRIC-INSTABILITIES; HIGH-POWER; ACCELERATOR; IONIZATION; SCATTERING; SYSTEM AB A comprehensive analysis is presented that describes the generation of harmonic radiation by the stimulated backscattering of intense laser fields from electron beams and from plasmas. The dynamics of the intense laser-electron interaction are analyzed using a fully nonlinear, relativistic, cold fluid model valid to all orders in the amplitude of the pump laser. In general, the backscattered radiation, from an electron beam or stationary plasma, occurs at odd harmonics of the Doppler-shifted incident laser frequency. The strength of the harmonics is strongly dependent on the incident laser intensity. The growth rate and saturation level of the backscattered harmonics are calculated, and the limitations due to thermal, space-charge, and collisional effects are discussed. Significant radiation generation at high harmonics requires sufficiently intense pump laser fields and sufficiently cold axial electron distributions. This mechanism may provide a practical method for producing coherent radiation in the xuv regime. RP ESAREY, E (reprint author), USN,RES LAB,DIV PLASMA PHYS,BEAM PHYS BRANCH,WASHINGTON,DC 20375, USA. NR 68 TC 60 Z9 60 U1 0 U2 3 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1050-2947 J9 PHYS REV A JI Phys. Rev. A PD APR 15 PY 1992 VL 45 IS 8 BP 5872 EP 5882 DI 10.1103/PhysRevA.45.5872 PG 11 WC Optics; Physics, Atomic, Molecular & Chemical SC Optics; Physics GA HQ038 UT WOS:A1992HQ03800070 ER PT J AU YU, R KRAKAUER, H SINGH, D AF YU, R KRAKAUER, H SINGH, D TI EQUILIBRIUM GEOMETRY AND ELECTRONIC-STRUCTURE OF THE LOW-TEMPERATURE W(001) SURFACE SO PHYSICAL REVIEW B LA English DT Article ID ORDER-DISORDER TRANSITION; TUNGSTEN 001 SURFACE; PLANE-WAVE METHOD; PHASE-TRANSITION; TOTAL-ENERGY; W 001; MULTILAYER RECONSTRUCTION; W(100); STATES; RESONANCES AB The multilayer reconstruction of the W(001) surface at low temperature and the multilayer relaxation of the unreconstructed surface are investigated using first-principles total-energy and force calculations. The fully relaxed ideal surface is determined to be unstable by 110 meV per surface atom, which agrees qualitatively with results of previous studies where multilayer relaxation and reconstruction were not taken into account and supports the conclusion that the high-temperature phase is disordered. The lateral displacement of the second-layer atoms is about 18% that of the first-layer atoms and the first interlayer distance is contracted by about 6% from the bulk value in the reconstructed surface. The lateral displacements compare well with a recent x-ray-diffraction experiment. The electronic structure and the surface-state dispersions for the equilibrium reconstructed geometry are examined in detail. C1 USN,RES LAB,COMPLEX SYST THEORY BRANCH,WASHINGTON,DC 20375. RP YU, R (reprint author), COLL WILLIAM & MARY,DEPT PHYS,WILLIAMSBURG,VA 23187, USA. RI Singh, David/I-2416-2012; OI Krakauer, Henry/0000-0003-2517-0957 NR 41 TC 34 Z9 37 U1 0 U2 1 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD APR 15 PY 1992 VL 45 IS 15 BP 8671 EP 8678 DI 10.1103/PhysRevB.45.8671 PG 8 WC Physics, Condensed Matter SC Physics GA HR336 UT WOS:A1992HR33600054 ER PT J AU KNIPP, PA REINECKE, TL AF KNIPP, PA REINECKE, TL TI INTERFACE PHONONS OF QUANTUM WIRES SO PHYSICAL REVIEW B LA English DT Article ID CONFINED LO; SCATTERING; MODES; SUPERLATTICES; CRYSTALS; WELL AB We have used the continuum dielectric approach to study the optical-interface-phonon modes of a quantum-wire structure consisting of one material buried within another. Wires with a number of cross-sectional shapes have been studied. Analytical results are presented for wires with elliptical cross sections, of which the circular cross section is a special case. Numerical results using an integral-equation approach are given for wires with arbitrary cross-sectional shapes including rectangles having rounded corners. The dependence of the modes on the wire cross sections and their relation to the vibrational modes of planar quantum wells are discussed. For large wave vectors parallel to the wire or around the wire circumference, the modes are found to approach those of the planar interface. Modes are found to be localized in the corners of the wires or regions of high curvature, and the degree of localization is found to increase with the increasing sharpness of the corners. RP KNIPP, PA (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 33 TC 68 Z9 68 U1 0 U2 5 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD APR 15 PY 1992 VL 45 IS 16 BP 9091 EP 9102 DI 10.1103/PhysRevB.45.9091 PG 12 WC Physics, Condensed Matter SC Physics GA HR130 UT WOS:A1992HR13000027 ER PT J AU BERMUDEZ, VM WILLIAMS, RT LONG, JP REED, RK KLEIN, PH AF BERMUDEZ, VM WILLIAMS, RT LONG, JP REED, RK KLEIN, PH TI PHOTOEMISSION-STUDY OF HYDROGEN ADSORPTION ON VANADIUM DIOXIDE NEAR THE SEMICONDUCTOR-METAL PHASE-TRANSITION SO PHYSICAL REVIEW B LA English DT Article ID ELECTRONIC-STRUCTURE; OXIDE SURFACES; VO2; CHEMISORPTION; V2O3 AB The valence-band ultraviolet photoemission spectrum of VO2 has been studied above and below the semiconductor-metal phase-transition temperature (almost-equal-to 340 K) as a function of exposure to hydrogen. Evidence is found for a partial reduction of the surface, leading to formation of adsorbed OH and an increase in the V 3d-electron density. The adsorbed hydrogen appears to impede the phase transition within the photoemission sampling depth. A model for this effect is suggested, based on an increased V-O pi-bonding interaction. C1 WAKE FOREST UNIV,DEPT PHYS,WINSTON SALEM,NC 27109. RP BERMUDEZ, VM (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. OI Reed, Rolf K./0000-0002-2633-6595 NR 24 TC 24 Z9 24 U1 0 U2 8 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD APR 15 PY 1992 VL 45 IS 16 BP 9266 EP 9271 DI 10.1103/PhysRevB.45.9266 PG 6 WC Physics, Condensed Matter SC Physics GA HR130 UT WOS:A1992HR13000047 ER PT J AU CHING, WM WYCHOWSKI, C BEACH, MJ WANG, H DAVIES, CL CARL, M BRADLEY, DW ALTER, HJ FEINSTONE, SM SHIH, JWK AF CHING, WM WYCHOWSKI, C BEACH, MJ WANG, H DAVIES, CL CARL, M BRADLEY, DW ALTER, HJ FEINSTONE, SM SHIH, JWK TI INTERACTION OF IMMUNE SERA WITH SYNTHETIC PEPTIDES CORRESPONDING TO THE STRUCTURAL PROTEIN REGION OF HEPATITIS-C VIRUS SO PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA LA English DT Article DE EPITOPE SCAN; IMMUNE RESPONSE ID NON-B-HEPATITIS; NON-A; ANTIGENIC DETERMINANTS; ANTIBODY-RESPONSE; AMINO-ACID; CHIMPANZEES; SEQUENCE; GENOME; ASSAY AB Comparison of the deduced amino acid sequence from the structural region of the Hutchinson strain of hepatitis C virus (HCV-H) with four other HCV isolates clearly divides the five isolates into two groups based on sequence homology. The first group includes HCV-H, HCV-1, and HC-J1, while the second includes HCV-J1 and HC-J4. Among the five isolates the first 190 residues (putative nucleocapsid) are highly conserved whereas residues 196-513 exhibit significant diversity and include a hypervariable region encompassing residues 386-404. A series of overlapping decapeptides were synthesized by solid-phase pin technology according to sequence from HCV-H (amino acids 1-513), HC-J4 (amino acids 181-513), and regions from the three other isolates which exhibited sequence variation. A modified ELISA was used to measure immunoreactivity of sera from clinical posttransfusion cases and experimentally infected chimpanzees. Comparison of pre- and postinfection samples revealed 16 clusters of immunoreactive peptides within the structural region, none of which was found in the hypervariable region. Only one cluster (amino acids 73-89) was recognized by all human and chimpanzee sera. Clear variation in the immune response was observed between individuals, although no obvious difference in reactivity between acute and chronic cases was observed. Within individual profiles, the reactivity to each peptide cluster and the total number of reactive clusters increased over time. C1 NIH,DEPT TRANSFUS MED,BLDG 10,ROOM 1C711,BETHESDA,MD 20892. USN,MED RES INST,BETHESDA,MD 20889. US FDA,ROCKVILLE,MD 20760. CTR DIS CONTROL,ATLANTA,GA 30333. NR 21 TC 48 Z9 49 U1 0 U2 0 PU NATL ACAD PRESS PI WASHINGTON PA 2101 CONSTITUTION AVE NW, WASHINGTON, DC 20418 SN 0027-8424 J9 P NATL ACAD SCI USA JI Proc. Natl. Acad. Sci. U. S. A. PD APR 15 PY 1992 VL 89 IS 8 BP 3190 EP 3194 DI 10.1073/pnas.89.8.3190 PG 5 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA HP043 UT WOS:A1992HP04300006 PM 1373489 ER PT J AU NATISHAN, PM MCCAFFERTY, E DONOVAN, EP BROWN, DW HUBLER, GK AF NATISHAN, PM MCCAFFERTY, E DONOVAN, EP BROWN, DW HUBLER, GK TI THE PITTING BEHAVIOR OF SILICON-NITRIDE ION-BEAM ASSISTED DEPOSITED COATINGS ON ALUMINUM SO SURFACE & COATINGS TECHNOLOGY LA English DT Article; Proceedings Paper CT 7TH INTERNATIONAL CONF ON SURFACE MODIFICATION OF METALS BY ION BEAMS ( SMMIB-91 ) CY JUL 14-19, 1991 CL GEORGETOWN UNIV, WASHINGTON, DC SP USN, OFF NAVAL RES, USA, RES OFF, ANATECH, COMMONWEALTH SCI, IMPLANT SCI, NISSIN ELECT, PEABODY SCI, SPIRE, ULTRA HIGH VACUUM INSTRUMENTS HO GEORGETOWN UNIV ID RAY PHOTOELECTRON-SPECTROSCOPY; IMPLANTED ALUMINUM; FILMS; SURFACES; OXIDES; NICKEL; XPS AB The pitting potential of silicon nitride ion beam assisted deposited (IBAD) coatings on aluminum in deaerated 0.1 M NaCl solutions increased with coating thickness for coatings ranging from 0.01 to 2.0-mu-m. Rutherford backscattering spectroscopy and optical techniques showed the films to be nearly stoichiometric Si3N4. X-ray photoelectron spectroscopy showed that the surface of the IBAD samples is composed of Si3N4, SiO2, and a silicon oxynitride species. Pit propagation beneath the coatings proceeds by blister formation and rupture. RP NATISHAN, PM (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 20 TC 13 Z9 13 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 APR 15 PY 1992 VL 51 IS 1-3 BP 30 EP 34 DI 10.1016/0257-8972(92)90210-2 PG 5 WC Materials Science, Coatings & Films; Physics, Applied SC Materials Science; Physics GA HV289 UT WOS:A1992HV28900007 ER PT J AU GEORGE, PJ BENNETT, MJ BISHOP, HE COTELL, CM GARRATTREED, AJ AF GEORGE, PJ BENNETT, MJ BISHOP, HE COTELL, CM GARRATTREED, AJ TI SECONDARY ION MASS-SPECTROMETRY AND SCANNING-TRANSMISSION AND TRANSMISSION ELECTRON-MICROSCOPY STUDIES OF THE EFFECTS OF REACTIVE ELEMENTS ON NICKEL OXIDATION SO SURFACE & COATINGS TECHNOLOGY LA English DT Article; Proceedings Paper CT 7TH INTERNATIONAL CONF ON SURFACE MODIFICATION OF METALS BY ION BEAMS ( SMMIB-91 ) CY JUL 14-19, 1991 CL GEORGETOWN UNIV, WASHINGTON, DC SP USN, OFF NAVAL RES, USA, RES OFF, ANATECH, COMMONWEALTH SCI, IMPLANT SCI, NISSIN ELECT, PEABODY SCI, SPIRE, ULTRA HIGH VACUUM INSTRUMENTS HO GEORGETOWN UNIV ID HIGH-TEMPERATURE; IMPLANTATION AB Implantation of reactive elements (REs), such as cerium and yttrium, at doses of 0.5-5 x 10(16) ions cm-2 has been shown to reduce the NiO scale growth rate substantially during the oxidation of nickel in oxygen at 900-degrees-C, at least during 5 h exposures. Understanding the mechanism involved necessitates establishing the location and form of the RE within the scale. These questions have now been addressed, primarily by secondary ion mass spectrometry (SIMS) and by scanning transmission and transmission electron microscopy (TEM/STEM) examination, on NiO scales formed on nickel implanted with either cerium or yttrium ions to 5 x 10(16) cm-2 during oxidation in oxygen at 900-degrees-C for periods between 0.25 and 150 h. SIMS demonstrated that initially the peak RE concentration within the scale was located near the gas interface but with increasing time it became positioned at increasing depth. NiO growth on unimplanted nickel is controlled primarily by outward cation transport. Assuming the position of the RE peak concentration is indicative of the original nickel surface then, at least initially, RE ion implantation changed the scale growth such that inward oxidant movement was dominant. However, with time, growth reverted increasingly to outward cation transport control. The resurgence or cation transport occurred earlier during the oxidation of cerium than yttrium implanted nickel. TEM/STEM has established that cerium was present as small oxide particles within both the NiO grains and grain boundaries and also that cerium and yttrium segregated along the scale grain boundaries. The segregant concentrations diminished with oxidation time, indicating diffusion along the boundaries, which was consistent with the SIMS observations. There would seem, therefore, to be a plausible correlation between the disposition of the REs within the NiO scale and their effect on the oxidation behaviour of nickel. C1 ATOM ENERGY AUTHOR TECHNOL,HARWELL LAB,DEPT SURFACE SCI & TECHNOL,DIDCOT OX11 0RA,OXON,ENGLAND. USN,RES LAB,SURFACE MODIFICAT BRANCH,WASHINGTON,DC 20375. MIT,CTR MAT SCI & ENGN,CAMBRIDGE,MA 02139. RP GEORGE, PJ (reprint author), KURUKSHETRA UNIV,DEPT PHYS,KURUKSHETRA 132119,HARYANA,INDIA. NR 15 TC 8 Z9 8 U1 0 U2 2 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 APR 15 PY 1992 VL 51 IS 1-3 BP 45 EP 51 DI 10.1016/0257-8972(92)90213-T PG 7 WC Materials Science, Coatings & Films; Physics, Applied SC Materials Science; Physics GA HV289 UT WOS:A1992HV28900010 ER PT J AU SEITZMAN, LE SINGER, IL BOLSTER, RN GOSSETT, CR AF SEITZMAN, LE SINGER, IL BOLSTER, RN GOSSETT, CR TI EFFECT OF A TITANIUM NITRIDE INTERLAYER ON THE ENDURANCE AND COMPOSITION OF A MOLYBDENUM-DISULFIDE COATING PREPARED BY ION-BEAM-ASSISTED DEPOSITION SO SURFACE & COATINGS TECHNOLOGY LA English DT Article; Proceedings Paper CT 7TH INTERNATIONAL CONF ON SURFACE MODIFICATION OF METALS BY ION BEAMS ( SMMIB-91 ) CY JUL 14-19, 1991 CL GEORGETOWN UNIV, WASHINGTON, DC SP USN, OFF NAVAL RES, USA, RES OFF, ANATECH, COMMONWEALTH SCI, IMPLANT SCI, NISSIN ELECT, PEABODY SCI, SPIRE, ULTRA HIGH VACUUM INSTRUMENTS HO GEORGETOWN UNIV ID LUBRICATION; FILMS AB MoS2 coatings, produced by ion-beam-assisted deposition (IBAD), with and without a TiN interlayer, were deposited onto bearing steel substrates for endurance testing. Endurance tests were performed, before and after vacuum annealing at 573 K, in dry air using a pin-on-disk tribometer. TiN made little difference to the endurance and the chemical behavior of the unannealed coatings, but prevented a drastic reduction in endurance after annealing. IBAD MoS2 coatings, with and without a TiN interlayer, were also deposited onto iron and 304 stainless steel substrates for chemical analysis using Rutherford backscattering spectrometry, Auger electron spectroscopy and X-ray diffraction. TiN prevented diffusion of substrate species into the coating during annealing at 573 K. Iron diffused into the annealed coating without a TiN interlayer, and sulfidation of the iron at the surface of the coating occurred. Iron diffusion, iron sulfidation, and the role of the TiN as a diffusion barrier are explained using a thermochemical approach. C1 SFA INC,LANDOVER,MD 20785. RP SEITZMAN, LE (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 20 TC 15 Z9 15 U1 0 U2 2 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 APR 15 PY 1992 VL 51 IS 1-3 BP 232 EP 236 DI 10.1016/0257-8972(92)90244-5 PG 5 WC Materials Science, Coatings & Films; Physics, Applied SC Materials Science; Physics GA HV289 UT WOS:A1992HV28900041 ER PT J AU KANT, RA HUBLER, GK AF KANT, RA HUBLER, GK TI KINETICS OF ION-BEAM DEPOSITION OF CARBON AT ROOM-TEMPERATURE SO SURFACE & COATINGS TECHNOLOGY LA English DT Article; Proceedings Paper CT 7TH INTERNATIONAL CONF ON SURFACE MODIFICATION OF METALS BY ION BEAMS ( SMMIB-91 ) CY JUL 14-19, 1991 CL GEORGETOWN UNIV, WASHINGTON, DC SP USN, OFF NAVAL RES, USA, RES OFF, ANATECH, COMMONWEALTH SCI, IMPLANT SCI, NISSIN ELECT, PEABODY SCI, SPIRE, ULTRA HIGH VACUUM INSTRUMENTS HO GEORGETOWN UNIV AB Growth rates of carbon films grown by ion beam deposition using methane gas were measured in situ as a function of deposition conditions. The methane pressure dependence of the growth rate was used to measure the cross-section for charge exchange. Variations in deposition rate per incident energetic particle found for each ion energy were related to ion current density. It was found that rates of growth per incident energetic specie were (i) largest for the smallest current densities, (ii) decreased monotonically with increasing current density, and (iii) were consistently larger than can be explained by deposition directly from the energetic flux alone. These observations were interpreted in terms of irradiation-induced surface interactions which promote chemisorption of methane physisorbed from the ambient atmosphere. RP KANT, RA (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 8 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 APR 15 PY 1992 VL 51 IS 1-3 BP 247 EP 251 DI 10.1016/0257-8972(92)90247-8 PG 5 WC Materials Science, Coatings & Films; Physics, Applied SC Materials Science; Physics GA HV289 UT WOS:A1992HV28900044 ER PT J AU HORWITZ, JS CHRISEY, DB GRABOWSKI, KS LEUCHTNER, RE AF HORWITZ, JS CHRISEY, DB GRABOWSKI, KS LEUCHTNER, RE TI PULSED LASER DEPOSITION OF ELECTRONIC CERAMICS SO SURFACE & COATINGS TECHNOLOGY LA English DT Article; Proceedings Paper CT 7TH INTERNATIONAL CONF ON SURFACE MODIFICATION OF METALS BY ION BEAMS ( SMMIB-91 ) CY JUL 14-19, 1991 CL GEORGETOWN UNIV, WASHINGTON, DC SP USN, OFF NAVAL RES, USA, RES OFF, ANATECH, COMMONWEALTH SCI, IMPLANT SCI, NISSIN ELECT, PEABODY SCI, SPIRE, ULTRA HIGH VACUUM INSTRUMENTS HO GEORGETOWN UNIV ID SUPERCONDUCTING THIN-FILMS; MOLECULAR-BEAM EPITAXY; PLASMA EMISSION; ABLATION; EVAPORATION; GROWTH; YBA2CU3O7 AB Pulsed laser deposition (PLD) is a unique physical vapor deposition technique which has gained considerable attention recently in the deposition of high quality, high temperature superconductors. In this technique, a short pulsed laser (< 100 ns) is focused onto a target of the material to be deposited. The rapid heating, vaporization and plasma formation at the target surface result in a highly forward directed plume of atomic and gas phase species. Unique to this technique is the stoichiometric evaporation of multicomponent materials, irrespective o( the individual constituent vapor pressures. Condensation of the stoichiometric plume onto heated single-crystal substrates results in the formation of single-phase, oriented thin films. Typically, depositions are performed in high pressures of reactive gas ambients. YBa2Cu3O7-delta thin films deposited by PLD have excellent d.c. and high frequency transport properties. For YBa2Cu3O7-delta, epitaxial multilayer structures of superconductor/dielectric/superconductor are reported. Microwave devices fabricated from superconducting thin films and multilayer films have demonstrated significant performance improvements over devices fabricated from conventional materials. High quality ferroelectric thin films are also being deposited by PLD. The deposition and electrical characterization of oriented PbZrxTi1-xO3 thin films are reported. PLD is shown as a versatile physical vapor deposition technique and will soon be an important industrial coating technique. RP HORWITZ, JS (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. OI Grabowski, Kenneth/0000-0003-0816-001X NR 61 TC 21 Z9 21 U1 0 U2 6 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 APR 15 PY 1992 VL 51 IS 1-3 BP 290 EP 298 DI 10.1016/0257-8972(92)90253-7 PG 9 WC Materials Science, Coatings & Films; Physics, Applied SC Materials Science; Physics GA HV289 UT WOS:A1992HV28900050 ER PT J AU GILMORE, CM SPRAGUE, JA AF GILMORE, CM SPRAGUE, JA TI A MOLECULAR-DYNAMICS ANALYSIS OF LOW-ENERGY ATOM SURFACE INTERACTION DURING ENERGETIC DEPOSITION OF SILVER THIN-FILMS SO SURFACE & COATINGS TECHNOLOGY LA English DT Article; Proceedings Paper CT 7TH INTERNATIONAL CONF ON SURFACE MODIFICATION OF METALS BY ION BEAMS ( SMMIB-91 ) CY JUL 14-19, 1991 CL GEORGETOWN UNIV, WASHINGTON, DC SP USN, OFF NAVAL RES, USA, RES OFF, ANATECH, COMMONWEALTH SCI, IMPLANT SCI, NISSIN ELECT, PEABODY SCI, SPIRE, ULTRA HIGH VACUUM INSTRUMENTS HO GEORGETOWN UNIV ID GROWTH; METALS; AG AB A three-dimensional molecular dynamics simulation was conducted of the deposition of 500 energetic silver atoms (three monolayers) incident on a (111) oriented substrate with 1008 dynamic atoms and 1008 frozen atoms. Incident atom energies were 10, 20 and 40 eV, and initial substrate temperatures were 300 and 0 K. All of these deposition conditions resulted in layer by layer growth. During the film depositions, interface mixing between deposited atoms and substrate atoms was also observed. This mixing was found to increase with increases in either incident atom energy or substrate temperature, with energy having the largest effect. The observed interface mixing mechanism was the partial or full embedding of an incoming atom in the top substrate layer, followed by the ejection of a substrate atom from that layer and the accommodation of the deposited atom in the substrate. C1 USN,RES LAB,SURFACE MODIFICAT BRANCH,WASHINGTON,DC 20375. RP GILMORE, CM (reprint author), GEORGE WASHINGTON UNIV,SCH ENGN & APPL SCI,WASHINGTON,DC 20052, USA. NR 8 TC 11 Z9 11 U1 1 U2 4 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 APR 15 PY 1992 VL 51 IS 1-3 BP 324 EP 327 DI 10.1016/0257-8972(92)90258-C PG 4 WC Materials Science, Coatings & Films; Physics, Applied SC Materials Science; Physics GA HV289 UT WOS:A1992HV28900055 ER PT J AU LEUCHTNER, RE CHRISEY, DB HORWITZ, JS GRABOWSKI, KS AF LEUCHTNER, RE CHRISEY, DB HORWITZ, JS GRABOWSKI, KS TI THE PREPARATION OF EPITAXIAL PLATINUM FILMS BY PULSED LASER DEPOSITION SO SURFACE & COATINGS TECHNOLOGY LA English DT Article; Proceedings Paper CT 7TH INTERNATIONAL CONF ON SURFACE MODIFICATION OF METALS BY ION BEAMS ( SMMIB-91 ) CY JUL 14-19, 1991 CL GEORGETOWN UNIV, WASHINGTON, DC SP USN, OFF NAVAL RES, USA, RES OFF, ANATECH, COMMONWEALTH SCI, IMPLANT SCI, NISSIN ELECT, PEABODY SCI, SPIRE, ULTRA HIGH VACUUM INSTRUMENTS HO GEORGETOWN UNIV ID TC SUPERCONDUCTING FILMS; THIN-FILMS; EVAPORATION; ABLATION; GROWTH AB A systematic study of the effects of ambient deposition pressure P(d) and substrate temperature T(s) on the morphology and crystal structure of platinum films deposited onto [100] MgO by pulsed laser deposition (PLD) is presented. Depositions were performed over a T(s) range of 20-650-degrees-C and a P(d) range of 10(-5)-1 Torr of O2. Different crystallographic orientations and a dramatic change in morphology were observed as a function of P(d) and T(s). For depositions performed at room temperature and for pressures greater than 10(-5) Torr, the films were comprised of mostly platinum oxide. At T(s) of 350-500-degrees-C and at all pressures studied, the platinum films were very smooth and oriented. At T(s) > 500-degrees-C. deposited films were characterized by islands whose average diameter varied from several nanometers to over a micrometer depending on the average film thickness; islands were prevalent P(d) greater-than-or-equal-to 0.05 Torr. Over the broad range of conditions examined, the film crystal structure varied from (100) epitaxy with a rocking curve width of less than 0.2-degrees, to films of mixed (100) and (111) preferred orientations. At a given T(s), the deposition rate per laser shot was found to depend on P(d). In general, the deposition rate was found to increase monotonically from about 0.1 angstrom per shot at 10(-5) Torr to a maximum of about 0.16 angstrom per shot near 0.05 Torr, then decrease to a minimum of about 0.08 angstrom per shot near 0.3 Torr and then increase again at pressures greater than 0.3 Torr. These effects can be explained in terms of a combination of gas dynamic processes and gas-surface interactions which occur between the platinum atoms and the oxygen molecules during deposition. RP LEUCHTNER, RE (reprint author), USN,RES LAB,4555 OVERLOOK AVE,SW CODE 4673,WASHINGTON,DC 20375, USA. OI Grabowski, Kenneth/0000-0003-0816-001X NR 22 TC 26 Z9 26 U1 2 U2 10 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 APR 15 PY 1992 VL 51 IS 1-3 BP 476 EP 482 DI 10.1016/0257-8972(92)90285-I PG 7 WC Materials Science, Coatings & Films; Physics, Applied SC Materials Science; Physics GA HV289 UT WOS:A1992HV28900082 ER PT J AU HUBLER, GK SMIDT, FA AF HUBLER, GK SMIDT, FA TI 7TH INTERNATIONAL-CONFERENCE ON SURFACE MODIFICATION OF METALS BY ION-BEAMS, WASHINGTON, DC, JULY 14-19, 1991 - PREFACE SO SURFACE & COATINGS TECHNOLOGY LA English DT Editorial Material RP HUBLER, GK (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU ELSEVIER SCIENCE SA LAUSANNE PI LAUSANNE 1 PA PO BOX 564, 1001 LAUSANNE 1, SWITZERLAND SN 0257-8972 J9 SURF COAT TECH JI Surf. Coat. Technol. PD APR 15 PY 1992 VL 51 IS 1-3 BP R5 EP R8 PG 4 WC Materials Science, Coatings & Films; Physics, Applied SC Materials Science; Physics GA HV289 UT WOS:A1992HV28900001 ER PT J AU RETTIG, W NACIRI, J SHASHIDHAR, R DURAN, RS AF RETTIG, W NACIRI, J SHASHIDHAR, R DURAN, RS TI THE BEHAVIOR OF FERROELECTRIC LIQUID-CRYSTALLINE COMPOUNDS AT THE AIR-WATER-INTERFACE SO THIN SOLID FILMS LA English DT Article; Proceedings Paper CT 5TH INTERNATIONAL CONF ON LANGMUIR-BLODGETT FILMS CY AUG 26-30, 1991 CL PARIS, FRANCE SP VILLE PARIS, SOC FRANCAISE CHIM, DELEGAT GEN ARMEMENT, USA ARMY, MINIST RECH TECHNOL, SECRETARIAT GEN DEF NATL, RHONE POULENC RECH, CEA, COMMISS EUROPEAN COMMUNITIES, CNRS ID MONOLAYERS; COMPRESSION AB A ferroelectric side-chain polymer with a siloxane backbone and its constituent monomer have been prepared. The film forming properties at the air-water interface are described in terms of temperature dependence, stability, and hysteresis behavior. The ability to form Langmuir-Blodgett mono- or multilayers with different substrates was also investigated. The LB layers were characterized by use of polarized UV-vis, FTIR, and SAXS. C1 USN,RES LABS,CTR BIOMOLEC SCI & ENGN,WASHINGTON,DC 20375. RP RETTIG, W (reprint author), UNIV FLORIDA,DEPT CHEM,GAINESVILLE,FL 32611, USA. NR 11 TC 27 Z9 27 U1 0 U2 0 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 APR 15 PY 1992 VL 210 IS 1-2 BP 114 EP 117 DI 10.1016/0040-6090(92)90184-D PG 4 WC Materials Science, Multidisciplinary; Materials Science, Coatings & Films; Physics, Applied; Physics, Condensed Matter SC Materials Science; Physics GA HT945 UT WOS:A1992HT94500036 ER PT J AU CALVERT, JM GEORGER, JH PECKERAR, MC PEHRSSON, PE SCHNUR, JM SCHOEN, PE AF CALVERT, JM GEORGER, JH PECKERAR, MC PEHRSSON, PE SCHNUR, JM SCHOEN, PE TI DEEP UV PHOTOCHEMISTRY AND PATTERNING OF SELF-ASSEMBLED MONOLAYER FILMS SO THIN SOLID FILMS LA English DT Article; Proceedings Paper CT 5TH INTERNATIONAL CONF ON LANGMUIR-BLODGETT FILMS CY AUG 26-30, 1991 CL PARIS, FRANCE SP VILLE PARIS, SOC FRANCAISE CHIM, DELEGAT GEN ARMEMENT, USA ARMY, MINIST RECH TECHNOL, SECRETARIAT GEN DEF NATL, RHONE POULENC RECH, CEA, COMMISS EUROPEAN COMMUNITIES, CNRS AB Patterned deep UV irradiation of organosilane self-assembled monolayer (SAM) films caused photocleavage of the organic groups in the molecule, and creates alternating regions of intact film and hydrophilic, surface silanol moieties. The exposed regions can undergo a second chemisorption reaction to produce an assembly of SAMs in the same molecular plane. The patterned SAM films can also act as a template for selective build-up of materials in the z-direction. The use of UV patterned silane SAM films as imaging layers for optical lithography has been demonstrated. The exposed films are selectively metallized using electroless deposition to produce a thin metal layer only in the unexposed areas. The film/metal assembly is a highly resistive barrier to reactive ion etching (RIE) for pattern transfer into the substrate. Features to 0.5-mu-m line width and working transistor test structures have been produced using this process. C1 USN,RES LAB,NANOELECTR PROC FACIL,WASHINGTON,DC 20375. USN,RES LAB,DIV CHEM,WASHINGTON,DC 20375. GEOCENTERS INC,FT WASHINGTON,MD 20744. RP CALVERT, JM (reprint author), USN,RES LAB,CTR BIOMOLEC SCI & ENGN,CODE 6090,WASHINGTON,DC 20375, USA. NR 21 TC 53 Z9 53 U1 2 U2 7 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 APR 15 PY 1992 VL 210 IS 1-2 BP 359 EP 363 DI 10.1016/0040-6090(92)90257-C PG 5 WC Materials Science, Multidisciplinary; Materials Science, Coatings & Films; Physics, Applied; Physics, Condensed Matter SC Materials Science; Physics GA HT945 UT WOS:A1992HT94500109 ER PT J AU DELSANTO, PP PROVENZANO, V UBERALL, H AF DELSANTO, PP PROVENZANO, V UBERALL, H TI COHERENCY STRAIN EFFECTS IN METALLIC BILAYERS SO JOURNAL OF PHYSICS-CONDENSED MATTER LA English DT Article ID COMPOSITION-MODULATED ALLOYS; ELASTIC-CONSTANTS; THIN-FILMS; MECHANICAL-PROPERTIES; FOILS; CU; SUPERLATTICES; MODULUS; NICKEL; MULTILAYERS AB Since its discovery, the so-called 'supermodulus effect' has attracted considerable attention, both in view of possible applications and because of its intrinsic fundamental scientific interest. Recent experimental investigations have, however, cast doubts on the very existence of the effect, or at least on its magnitude. From a theoretical point of view, several models have been proposed to explain the effect, but none is fully convincing. In the present paper we investigate the coherency strain model, which we believe may yield the most plausible quantitative explanation of the supermodulus effect. We follow the approach first proposed by Jankowski and Tsakalakos, but, in addition to other modifications, we evaluate the biaxial modulus for a deformation in the [111] direction, as observed experimentally, rather than the [100] direction, as chosen by Jankowski and Tsakalakos (probably because it was easier to determine the biaxial modulus in this rather than in the [111] direction). C1 CATHOLIC UNIV AMER, DEPT PHYS, WASHINGTON, DC 20004 USA. USN, RES LAB, WASHINGTON, DC 20375 USA. RP DELSANTO, PP (reprint author), POLITECN TORINO, DIPARTIMENTO FIS, I-10129 TURIN, ITALY. NR 28 TC 8 Z9 8 U1 0 U2 1 PU IOP PUBLISHING LTD PI BRISTOL PA DIRAC HOUSE, TEMPLE BACK, BRISTOL BS1 6BE, ENGLAND SN 0953-8984 J9 J PHYS-CONDENS MAT JI J. Phys.-Condes. Matter PD APR 13 PY 1992 VL 4 IS 15 BP 3915 EP 3928 DI 10.1088/0953-8984/4/15/006 PG 14 WC Physics, Condensed Matter SC Physics GA HP515 UT WOS:A1992HP51500006 ER PT J AU NGAI, KL PENG, SL SKOLNICK, J AF NGAI, KL PENG, SL SKOLNICK, J TI GENERALIZED FOKKER-PLANCK APPROACH TO THE COUPLING MODEL AND COMPARISON WITH COMPUTER-SIMULATIONS SO MACROMOLECULES LA English DT Article ID CONCENTRATED POLYMER SYSTEMS; CONDENSED MACROMOLECULAR SYSTEMS; SELF-DIFFUSION; COOPERATIVE RELAXATIONS; MOLECULAR-WEIGHT; DYNAMICS; MELTS; REPTATION; LIQUIDS; CHAIN AB The coupling model is reformulated using a Fokker-Planck approach to generalize the Rouse model to include time-dependent rate slowing down by entanglement coupling. The results compare favorably with data of several computer simulations. In particular, we point out the results of the normal-mode analysis of the molecular dynamics simulations of Kremer and Grest are in good agreement with the coupling model but at variance with the reptation model. C1 GEORGIA INST TECHNOL, SCH PHYS, ATLANTA, GA 30332 USA. Scripps Res Inst, RES INST, DEPT MOLEC BIOL, LA JOLLA, CA 92037 USA. RP USN, RES LAB, WASHINGTON, DC 20375 USA. NR 41 TC 25 Z9 25 U1 0 U2 1 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0024-9297 EI 1520-5835 J9 MACROMOLECULES JI Macromolecules PD APR 13 PY 1992 VL 25 IS 8 BP 2184 EP 2191 DI 10.1021/ma00034a019 PG 8 WC Polymer Science SC Polymer Science GA HN935 UT WOS:A1992HN93500019 ER PT J AU TSANG, KY SCHWARTZ, IB AF TSANG, KY SCHWARTZ, IB TI INTERHYPERHEDRAL DIFFUSION IN JOSEPHSON-JUNCTION ARRAYS SO PHYSICAL REVIEW LETTERS LA English DT Article ID STATES AB We study the phase space for arrays of coupled Josephson-junction oscillators which have coexisting in-phase and antiphase attractors. Arrays with four or more oscillators have significantly different attracting sets from those with two or three: Continuous families of out-of-phase attractors can exist instead of isolated ones. A new mechanism in the presence of small amplitude noise is proposed to account for the observed transitions among different stable antiphase states, and the rarely observed transitions between an in-phase and an antiphase attractor. RP TSANG, KY (reprint author), USN,RES LAB,SPECIAL PROJECT NONLINEAR SCI,CODE 47003,WASHINGTON,DC 20375, USA. RI Schwartz, Ira/A-8073-2009 NR 25 TC 42 Z9 42 U1 0 U2 1 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0031-9007 J9 PHYS REV LETT JI Phys. Rev. Lett. PD APR 13 PY 1992 VL 68 IS 15 BP 2265 EP 2268 DI 10.1103/PhysRevLett.68.2265 PG 4 WC Physics, Multidisciplinary SC Physics GA HP054 UT WOS:A1992HP05400003 ER PT J AU KEENAN, FP CONLON, ES HARRA, LK AGGARWAL, KM WIDING, KG AF KEENAN, FP CONLON, ES HARRA, LK AGGARWAL, KM WIDING, KG TI NE-V LINE RATIOS IN THE EUV SPECTRA OF SOLAR-FLARES SO ASTROPHYSICAL JOURNAL LA English DT Article DE ATOMIC DATA; ATOMIC PROCESSES; SUN FLARES; SUN UV RADIATION ID EXTREME-ULTRAVIOLET-SPECTRUM; XUV OBSERVATIONS; COMPACT FLARE; SKYLAB; TRANSITIONS; STRENGTHS; SUN AB Theoretical line ratios involving 2s(2)2p(2)-2s2p3 transitions in Ne v between 359 and 572 angstrom are presented. A comparison of these with solar flare observational data from the Naval Research Laboratory's S082A spectrograph on board Skylab reveals excellent agreement between theory and experiment, with discrepancies that average only 8%. This provides experimental support for the accuracy of the atomic data adopted in the line ratio calculations, and in addition resolves discrepancies between theory and observations previously found for this species. The potential usefulness of the Ne V line ratios as electron temperature diagnostics for the solar transition region is briefly discussed. C1 UNIV DELHI,DEPT PHYS & ASTROPHYS,DELHI 110007,INDIA. USN,RES LAB,EO HULBURT CTR SPACE RES,WASHINGTON,DC 20375. RP KEENAN, FP (reprint author), QUEENS UNIV BELFAST,DEPT PURE & APPL PHYS,BELFAST BT7 1NN,ANTRIM,NORTH IRELAND. OI Harra, Louise/0000-0001-9457-6200 NR 26 TC 3 Z9 3 U1 0 U2 0 PU UNIV CHICAGO PRESS PI CHICAGO PA 5720 S WOODLAWN AVE, CHICAGO, IL 60637 SN 0004-637X J9 ASTROPHYS J JI Astrophys. J. PD APR 10 PY 1992 VL 389 IS 1 BP 440 EP 442 DI 10.1086/171219 PN 1 PG 3 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA HM689 UT WOS:A1992HM68900036 ER PT J AU WILLIAMS, KJ ESMAN, RD AF WILLIAMS, KJ ESMAN, RD TI OBSERVATION OF PHOTODETECTOR NONLINEARITIES SO ELECTRONICS LETTERS LA English DT Article DE PHOTODETECTORS; OPTICAL DETECTORS; DISTORTION; OPTICAL MEASUREMENT; OPTOELECTRONICS ID DISTORTION AB A heterodyne technique is used to characterise the nonlinear response behaviour of microwave pin photodetectors in terms of 3 dB bandwidth reduction and signal distortion of the sinusoidal input/output. Bandwidth reductions from 20 to 2.5 GHz (at 1.6 mW) are observed. RP WILLIAMS, KJ (reprint author), USN,RES LAB,OPT TECHNIQUES BRANCH,CODE 6570,4555 OVERLOOK AVE SW,WASHINGTON,DC 20375, USA. NR 4 TC 38 Z9 38 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 APR 9 PY 1992 VL 28 IS 8 BP 731 EP 732 DI 10.1049/el:19920463 PG 2 WC Engineering, Electrical & Electronic SC Engineering GA HP543 UT WOS:A1992HP54300021 ER PT J AU ALEXANDER, RB BOLTON, ES KOENIG, S JONES, GM TOPALIAN, SL JUNE, CH ROSENBERG, SA AF ALEXANDER, RB BOLTON, ES KOENIG, S JONES, GM TOPALIAN, SL JUNE, CH ROSENBERG, SA TI DETECTION OF ANTIGEN SPECIFIC LYMPHOCYTES-T BY DETERMINATION OF INTRACELLULAR CALCIUM-CONCENTRATION USING FLOW-CYTOMETRY SO JOURNAL OF IMMUNOLOGICAL METHODS LA English DT Article DE CALCIUM; LYMPHOCYTE-T; ACTIVATION; FLOW CYTOMETRY; (HUMAN) ID CELLS; ACTIVATION; RECOGNITION; INCREASE; TARGETS; CYTOLYSIS; KILLER; CA2+ AB We present a method for the detection of lymphocytes with specific reactivity to antigens on stimulator cells using flow cytometry. Cultured human T lymphocytes were loaded with the intracellular fluorochrome indo-1 and were mixed with stimulator cells. Using flow cytometry we could detect a specific increase in intracellular calcium in the T lymphocytes as well as conjugation between the T cells and the stimulator cells. Examination of antigen-specific CD4+ and CD8+ T cell clones demonstrated that the vast majority of T cells which were conjugated to antigen-bearing stimulator cells manifested a rapid increase in intracellular calcium. In contrast T cells conjugated to stimulator cells which did not bear specific antigen demonstrated no such increase in calcium. A similar finding was observed when examining polyclonal tumor infiltrating lymphocytes obtained from patients with melanoma. Tumor infiltrating lymphocytes with specific antitumor reactivity demonstrated an increase in intracellular calcium when conjugated to autologous tumor but not to allogeneic melanoma. In contrast to the T cell clones, only a small subpopulation of tumor infiltrating lymphocytes manifested this specific signal upon conjugation with autologous tumor. This suggests that tumor infiltrating lymphocyte cultures contain T cells with varying reactivities to tumor or may also imply heterogeneity in the stimulating tumor cell lines. The method allows for the detection of specific T cells on an individual cell basis in real time. The procedure is not lethal to the cell and sorting and subculturing of reactive T cell populations can be readily performed. The method could also be used to sort stimulator cells based on their ability to elicit an increase in intracellular calcium in selected T cells. C1 USN,MED RES INST,BETHESDA,MD 20814. NIAID,IMMUNOREGULAT LAB,BETHESDA,MD 20892. RP ALEXANDER, RB (reprint author), NCI,SURG BRANCH,BLDG 10,ROOM 2B56,BETHESDA,MD 20892, USA. NR 28 TC 9 Z9 9 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 APR 8 PY 1992 VL 148 IS 1-2 BP 131 EP 141 DI 10.1016/0022-1759(92)90166-Q PG 11 WC Biochemical Research Methods; Immunology SC Biochemistry & Molecular Biology; Immunology GA HP092 UT WOS:A1992HP09200016 PM 1564323 ER PT J AU FODOR, GE NAEGELI, DW TURNER, LM AF FODOR, GE NAEGELI, DW TURNER, LM TI INHIBITION OF PEROXIDE FORMATION BY HINDERED PHENOLS IN JET FUELS SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 SOUTHWEST RES INST,BELVOIR FUELS & LUBRICANTS RES FACIL,SAN ANTONIO,TX 78228. USN,CTR AIR PROP,TRENTON,NJ 08628. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD APR 5 PY 1992 VL 203 BP 12 EP PETR PN 2 PG 0 WC Chemistry, Multidisciplinary SC Chemistry GA HK162 UT WOS:A1992HK16201958 ER PT J AU SITZMANN, ME AF SITZMANN, ME TI SF5-CONTAINING HIGH-ENERGY MATERIALS - SF5-OXADIAZOLES SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 USN,CTR SURFACE WARFARE,SILVER SPRING,MD 20903. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD APR 5 PY 1992 VL 203 BP 32 EP FLUO PN 1 PG 0 WC Chemistry, Multidisciplinary SC Chemistry GA HK161 UT WOS:A1992HK16102291 ER PT J AU PAGE, M AF PAGE, M TI ABINITIO CALCULATION OF THE REACTION-PATH FOR RADICAL-RADICAL REACTIONS SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 USN,RES LAB,COMPUTAT PHYS & FLUID DYNAM LAB,WASHINGTON,DC 20375. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD APR 5 PY 1992 VL 203 BP 34 EP PHYS PN 2 PG 0 WC Chemistry, Multidisciplinary SC Chemistry GA HK162 UT WOS:A1992HK16202130 ER PT J AU SOTO, MR PAGE, M AF SOTO, MR PAGE, M TI RATE-CONSTANT DETERMINATION FOR H+HNO-]H2+NO FROM ABINITIO REACTION-PATH CALCULATIONS SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 USN,RES LAB,WASHINGTON,DC 20375. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD APR 5 PY 1992 VL 203 BP 41 EP PHYS PN 2 PG 0 WC Chemistry, Multidisciplinary SC Chemistry GA HK162 UT WOS:A1992HK16202137 ER EF