FN Thomson Reuters Web of Science™ VR 1.0 PT J AU MILLER, WA BROWN, LG HUNDLEYGOFF, EM VEAL, SL AF MILLER, WA BROWN, LG HUNDLEYGOFF, EM VEAL, SL TI STOCKHOLM SOUTHWEST FIELD SO AAPG BULLETIN-AMERICAN ASSOCIATION OF PETROLEUM GEOLOGISTS LA English DT Meeting Abstract C1 PACIFIC ENTERPRISES OIL CO,DENVER,CO. MARATHON OIL CO,HOUSTON,TX. DCX RESOURCES,DENVER,CO. USN,DENVER,CO. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER ASSN PETROL GEOLOGISTS PI TULSA PA 1444 S BOULDER AVE PO BOX 979, TULSA, OK 74101 SN 0149-1423 J9 AAPG BULL JI AAPG Bull.-Am. Assoc. Petr. Geol. PD AUG PY 1991 VL 75 IS 8 BP 1397 EP 1397 PG 1 WC Geosciences, Multidisciplinary SC Geology GA GA885 UT WOS:A1991GA88500088 ER PT J AU WOJTOWICZ, T DOBROWOLSKA, M FURDYNA, JK MEYER, JR BARTOLI, FJ HOFFMAN, CA RAMMOHAN, LR AF WOJTOWICZ, T DOBROWOLSKA, M FURDYNA, JK MEYER, JR BARTOLI, FJ HOFFMAN, CA RAMMOHAN, LR TI FAR-INFRARED MAGNETOOPTICAL STUDIES OF HGTE-CDTE SUPERLATTICES IN THE SEMIMETALLIC REGIME SO ACTA PHYSICA POLONICA A LA English DT Article; Proceedings Paper CT 20TH JUBILEE INTERNATIONAL SCHOOL ON PHYSICS OF SEMICONDUCTING COMPOUNDS ( JASZOWIEC 91 ) CY MAY 27-31, 1991 CL JASZOWIEC, POLAND SP ACAD SCI POLAND, INST PHYS, WARSAW UNIV, FAC PHYS ID ELECTRON; TRANSPORT; HOLES AB We review recent magneto-optical investigations performed on HgTe-CdTe semimetallic superlattices. Far infrared magnetotransmission data obtained as a function of temperature, photon energy, and sense of circular polarization are compared with the predictions of a comprehensive new theory which fully incorporates the complexities of type-III superlattice band structure. It is found that the theory-accounts for nearly all of the many unusual features which have been observed experimentally. These include the occurrence of two cyclotron resonances due to holes; the coexistence of electron and hole cyclotron resonances in the low temperature limit; the observation of three distinct CRA minima; a step-like change in the temperature dependence of the electron cyclotron mass; and a dramatic increase of the CRI absorption peak intensity with increasing magnetic field. C1 USN,RES LAB,WASHINGTON,DC 20375. WORCESTER POLYTECH INST,WORCESTER,MA 01609. RP WOJTOWICZ, T (reprint author), UNIV NOTRE DAME,NOTRE DAME,IN 46556, USA. RI Ram-Mohan, Ramdas/C-5167-2012; Wojtowicz, Tomasz/A-2887-2017 NR 15 TC 0 Z9 0 U1 0 U2 0 PU POLISH ACAD SCIENCES INST PHYSICS PI WARSAW PA AL LOTNIKOW 32-46, 02-668 WARSAW, POLAND SN 0587-4246 J9 ACTA PHYS POL A JI Acta Phys. Pol. A PD AUG PY 1991 VL 80 IS 2 BP 245 EP 254 PG 10 WC Physics, Multidisciplinary SC Physics GA HB175 UT WOS:A1991HB17500009 ER PT J AU SARPKAYA, T AF SARPKAYA, T TI NONIMPULSIVELY STARTED STEADY FLOW ABOUT A CIRCULAR-CYLINDER SO AIAA JOURNAL LA English DT Article ID VELOCITY-FIELDS; VISCOUS-FLOW; EARLY STAGE; VORTICES; WAKE AB The effect of constant acceleration, prior to the establishment of a steady uniform flow, on some of the characteristics of the resulting time-dependent flow about a circular cylinder is investigated experimentally. It is shown that the occurrence of a local maximum drag, the onset of wake asymmetry, and the evolution of the transverse force are dependent on the parameters characterizing the nonimpulsive nature of the ambient flow. RP SARPKAYA, T (reprint author), NAVAL USA,POSTGRAD SCH,MONTEREY,CA 93943, USA. NR 21 TC 15 Z9 15 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 AUG PY 1991 VL 29 IS 8 BP 1283 EP 1289 DI 10.2514/3.10733 PG 7 WC Engineering, Aerospace SC Engineering GA FZ251 UT WOS:A1991FZ25100011 ER PT J AU OSBORN, RE ALDER, DC MITCHELL, CS AF OSBORN, RE ALDER, DC MITCHELL, CS TI MR IMAGING OF THE BRAIN IN PATIENTS WITH MIGRAINE HEADACHES SO AMERICAN JOURNAL OF ROENTGENOLOGY LA English DT Article ID WHITE-MATTER LESIONS; ELDERLY SUBJECTS; AGING BRAIN; SCANS; FOCI AB Forty-one patients with migraine headaches were referred for MR imaging of the brain. Intermediate and T2-weighted images were obtained to determine the frequency of areas of high intensity within the white matter. The average age of these patients was 29.8 years; only five were over 40 years old. Each patient was evaluated in the axial plane with long TR/short and long TE images. Twenty-three patients also had T1-weighted short TR/short TE MR scans; enhancement with gadopentetate dimeglumine was used in three patients. Intracranial abnormalities were seen in only six patients: foci or white matter high intensity on intermediate and T2-weighted images in five and a venous angioma in one. Prior studies have indicated that parenchymal brain abnormalities may be found in up to 46% of patients with migraines. The current study demonstrated parenchymal brain lesions in only 12%. This study suggests that the frequency of foci of high intensity seen on long TR sequences in the migraine patient is much lower than previously reported, especially in patients under 40 years old (5.5% in our series). C1 USN HOSP,DEPT CLIN INVEST,SAN DIEGO,CA 92134. USN HOSP,DEPT RADIOL,SAN DIEGO,CA 92134. NR 14 TC 1 Z9 1 U1 0 U2 0 PU AMER ROENTGEN RAY SOC PI RESTON PA 1891 PRESTON WHITE DR SUBSCRIPTION FULFILLMENT, RESTON, VA 22091 SN 0361-803X J9 AM J ROENTGENOL JI Am. J. Roentgenol. PD AUG PY 1991 VL 157 IS 2 BP 385 EP 388 PG 4 WC Radiology, Nuclear Medicine & Medical Imaging SC Radiology, Nuclear Medicine & Medical Imaging GA FX466 UT WOS:A1991FX46600036 ER PT J AU GRATE, JW WENZEL, SW WHITE, RM AF GRATE, JW WENZEL, SW WHITE, RM TI FLEXURAL PLATE WAVE DEVICES FOR CHEMICAL-ANALYSIS SO ANALYTICAL CHEMISTRY LA English DT Article ID PATTERN-RECOGNITION; SENSORS; RESPONSES; OSCILLATOR; PROBE; FILMS AB The mass sensitivities, vapor sensitivities, and vapor detection limits of flexural plate wave (FPW) and surface acoustic wave (SAW) vapor sensors are compared both theoretically and experimentally. FPW devices offer high mass sensitivity at much lower operating frequency. Mass sensitivity increases as membrane thickness is decreased; frequency decreases at the same time. This scaling law is in contrast to SAW devices where mass sensitivity increases as frequency increases. FPW devices with sorbent polymer films respond to vapors in a manner similar to that of SAW devices coated with the same polymer. The FPW vapor sensor, however, offers lower absolute noise levels and hence lower vapor detection limits. It is also demonstrated experimentally that FPW devices can monitor changes in polymer films as the polymer undergoes the glass transition. Plots of frequency vs temperature show a discontinuity in slope at the static glass transition. C1 UNIV CALIF BERKELEY, DEPT ELECT ENGN & COMP SCI, BERKELEY SENSOR & ACTUATOR CTR, BERKELEY, CA 94720 USA. UNIV CALIF BERKELEY, ELECTR RES LAB, BERKELEY, CA 94720 USA. RP USN, RES LAB, DIV CHEM, WASHINGTON, DC 20375 USA. NR 42 TC 46 Z9 48 U1 0 U2 4 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0003-2700 EI 1520-6882 J9 ANAL CHEM JI Anal. Chem. PD AUG 1 PY 1991 VL 63 IS 15 BP 1552 EP 1561 DI 10.1021/ac00015a011 PG 10 WC Chemistry, Analytical SC Chemistry GA FY568 UT WOS:A1991FY56800013 ER PT J AU BLANCO, JR MCMARR, PJ AF BLANCO, JR MCMARR, PJ TI ROUGHNESS MEASUREMENTS OF SI AND AL BY VARIABLE ANGLE SPECTROSCOPIC ELLIPSOMETRY SO APPLIED OPTICS LA English DT Article ID MICROSCOPIC SURFACE-ROUGHNESS; EFFECTIVE-MEDIUM MODELS; LIGHT-SCATTERING; OPTICAL-PROPERTIES; ALUMINUM; FILMS; PARAMETERS; SYSTEM; BOUNDARIES; SUBSTRATE AB Rough surfaces of silicon and aluminum have been studied by rotating analyzer spectroscopic ellipsometry (RASE). The roughness of a silicon sample similar to that used for the RASE measurements was also studied by cross-sectional transmission electron microscopy. Total integrated scattering was measured on the aluminum specimens to obtain numerical estimates of the rms roughness. The ellipsometry measurements on these specimens were carried out at a number of angles of incidence in the 30-80-degrees range and at a number of discrete wavelengths in the 300-650-nm spectral range. The RASE results were then analyzed using the Bruggeman effective-medium theory for the Si sample and scalar diffraction theory for the Al samples. This study shows that 70-degrees is the optimum angle of incidence for characterizing the roughness of these Al surfaces using RASE. It also demonstrates the self-consistency of the Bruggeman theory with angular variation for the Si sample. The need for a vector diffraction theory for the interpretation of the rms roughness using ellipsometric angles DELTA and PSI is discussed. C1 USN,RES LAB,DIV ELECTR SCI & TECHNOL,WASHINGTON,DC 20375. RP BLANCO, JR (reprint author), CALIF STATE UNIV NORTHRIDGE,DEPT PHYS & ASTRON,NORTHRIDGE,CA 91330, USA. NR 59 TC 12 Z9 12 U1 0 U2 3 PU OPTICAL SOC AMER PI WASHINGTON PA 2010 MASSACHUSETTS AVE NW, WASHINGTON, DC 20036 SN 0003-6935 J9 APPL OPTICS JI Appl. Optics PD AUG 1 PY 1991 VL 30 IS 22 BP 3210 EP 3220 PG 11 WC Optics SC Optics GA FY055 UT WOS:A1991FY05500021 PM 20706377 ER PT J AU LEVISON, HF AF LEVISON, HF TI THE LONG-TERM DYNAMIC BEHAVIOR OF SMALL BODIES IN THE KUIPER BELT SO ASTRONOMICAL JOURNAL LA English DT Article ID SHORT-PERIOD COMETS; SOLAR-SYSTEM; ORIGINAL DISTRIBUTION; CHAOTIC MOTION; STABLE ORBITS; EVOLUTION; ASTEROIDS; JUPITER; NEPTUNE; SATURN AB The results are presented from a new numerical technique to determine the long-term dynamical behavior of objects in the Kuiper belt. According to this model, it is possible for some objects that formed in a well-defined region of the Kuiper belt to have lifetimes of approximately 5 x 10(9) yr, after which they leave the region between 30 and 100 AU. Therefore, the Kuiper belt can be the source of short-period comets. Objects tend to diffuse through a region 70 AU in extent on timescales that are on the order of the age of the solar system. Objects that form close to the orbit of Neptune have a significant chance of evolving to orbits with a > 100 AU. These objects can be effectively stored in these orbits for a very long time. C1 USRA,WASHINGTON,DC 20024. RP LEVISON, HF (reprint author), USN OBSERV,DEPT ORBITAL MECH,34TH & MASSACHUSETTS AVE NW,WASHINGTON,DC 20392, USA. RI Levison, Harold/C-6061-2013 OI Levison, Harold/0000-0001-5847-8099 NR 14 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 0004-6256 J9 ASTRON J JI Astron. J. PD AUG PY 1991 VL 102 IS 2 BP 787 EP 794 DI 10.1086/115910 PG 8 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA FY255 UT WOS:A1991FY25500027 ER PT J AU GAUME, RA JOHNSTON, KJ NGUYEN, HA WILSON, TL DICKEL, HR GOSS, WM WRIGHT, MCH AF GAUME, RA JOHNSTON, KJ NGUYEN, HA WILSON, TL DICKEL, HR GOSS, WM WRIGHT, MCH TI NGC-7538 IRS-1 - SUBARCSECOND RESOLUTION RECOMBINATION LINE AND (NH3)-N-15 MASER OBSERVATIONS SO ASTROPHYSICAL JOURNAL LA English DT Article DE INFRARED, SOURCES; INTERSTELLAR, MOLECULES; MASERS; NEBULAE, H-II REGIONS; NEBULAE, INDIVIDUAL (NGC 7538) ID H-II REGIONS; VLA OBSERVATIONS; AMMONIA; OUTFLOWS AB The (NH3)-N-15 (J, K) = maser emission associated with NGC 7538 IRS 1 has been imaged with 0".2 resolution. The masers are distributed in a 0".2 region coincident with the 1.3 cm wavelength continuum core of the NGC 7538 IRS 1 H II region. The strongest (NH3)-N-15 masers are found concentrated in two regions separated by approximately 0".2. These masers may be amplifying the strong double-lobe radio continuum core of the IRS 1 H II region. The velocities of the (NH3)-N-15 masers range from -62 to -53 km s-1 and show a systematic velocity gradient from SW (-62 km s-1) to NE (-52 to -54 km s-1). The orientation of this gradient is similar to that found by Scoville et al. (1986) for the (CO)-C-13 emission toward IRS 1. The orientation of this several hydrogen recombination line transitions are reported. These observations show that the velocity of the IRS 2 H II region is similar to that of the ambient molecular cloud, almost-equal-to -65 km s-1. However, unlike IRS 2, the IRS 1 H II region is significantly redshifted with respect to the molecular cloud. The velocity of the IRS 1 H II region, as determined from H 76-alpha data, is almost-equal-to -22 km s-1. We interpret this as implying that the ionized gas is champagne flowing off the foreground molecular cloud. C1 MAX PLANCK INST RADIOASTRON,W-5300 BONN 1,GERMANY. UNIV ILLINOIS,DEPT ASTRON,URBANA,IL 61801. NATL RADIO ASTRON OBSERV,SOCORRO,NM 87801. UNIV CALIF BERKELEY,RADIO ASTRON LAB,BERKELEY,CA 94720. RP GAUME, RA (reprint author), USN,RES LAB,CTR ADV SPACE SENSING,CODE 42136,WASHINGTON,DC 20375, USA. NR 23 TC 21 Z9 21 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 AUG 1 PY 1991 VL 376 IS 2 BP 608 EP 614 DI 10.1086/170308 PN 1 PG 7 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA FY359 UT WOS:A1991FY35900021 ER PT J AU MORRIS, A TEMME, LA HAMILTON, PV AF MORRIS, A TEMME, LA HAMILTON, PV TI VISUAL-ACUITY OF THE UNITED-STATES NAVY JET PILOT AND THE USE OF THE HELMET SUN VISOR SO AVIATION SPACE AND ENVIRONMENTAL MEDICINE LA English DT Article AB Visor wear habits, evaluative comments and vision test data were obtained from interviews of 126 Navy fighter pilots. The interviews revealed that many pilots use their helmet sun visor whenever they fly, some use it only during certain flight operations, and others never use it. Study 1 (conducted at 343 cd/m2) revealed a decrease in low contrast visual acuity attributable to helmet sun visor use in the presence of a glare source. These findings prompted a second study of the visual effects of visor transmittance. Low-contrast spot detection, acuity, and contrast sensitivity were measured at an operationally realistic daytime illumination level (6870 cd/m2) in subjects viewing through filters ranging from 6.3% to 50.1% transmission. (Standard visor transmission is 12 +/- 4%.) Results showed that filter density, and consequently the illuminance reaching the eyes, could be varied over a wide range without critically affecting these visual functions. Prevailing environmental illuminance should be considered when selecting sun visors or sunglasses. These results have implications for optimizing visual performance through visors. RP MORRIS, A (reprint author), USN,EAR NOSE & THROAT RES LAB,NAVAL AIR STN,PENSACOLA,FL 32508, USA. NR 21 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 AUG PY 1991 VL 62 IS 8 BP 715 EP 721 PG 7 WC Public, Environmental & Occupational Health; Medicine, General & Internal; Sport Sciences SC Public, Environmental & Occupational Health; General & Internal Medicine; Sport Sciences GA FZ249 UT WOS:A1991FZ24900001 PM 1930051 ER PT J AU FEDERICO, PA AF FEDERICO, PA TI MEASURING RECOGNITION PERFORMANCE USING COMPUTER-BASED AND PAPER-BASED METHODS SO BEHAVIOR RESEARCH METHODS INSTRUMENTS & COMPUTERS LA English DT Article ID ALCOHOL; TESTS RP FEDERICO, PA (reprint author), USN,CTR PERSONNEL RES & DEV,CODE 15,SAN DIEGO,CA 92152, USA. NR 45 TC 12 Z9 12 U1 0 U2 0 PU PSYCHONOMIC SOC INC PI AUSTIN PA 1710 FORTVIEW RD, AUSTIN, TX 78704 SN 0743-3808 J9 BEHAV RES METH INSTR JI Behav. Res. Methods Instr. Comput. PD AUG PY 1991 VL 23 IS 3 BP 341 EP 347 PG 7 WC Psychology, Mathematical; Psychology, Experimental SC Psychology GA GA789 UT WOS:A1991GA78900001 ER PT J AU MERLO, GR CROPP, CS CALLAHAN, R TAKAHASHI, T AF MERLO, GR CROPP, CS CALLAHAN, R TAKAHASHI, T TI DETECTION OF LOSS OF HETEROZYGOSITY IN TUMOR DNA SAMPLES BY PCR SO BIOTECHNIQUES LA English DT Note ID GENE; POLYMORPHISM; CANCER AB We demonstrate that PCR amplification of human genomic DNA can be used for the detection of loss of heterozygosity (LOH) in tumor samples. A 250-bp fragment containing codon 72 of the human p53 gene was amplified, ThaI digested and electrophoresed. Tumor LOH is detectable both by ethidium bromide staining and autoradiography, despite 25% contamination with normal DNA. This technique provides a fast and reproducible alternative to conventional Southern blotting and has minimal sample requirements. C1 NCI,TUMOR IMMUNOL & BIOL LAB,ONCOGENET SECT,BLDG 10,ROOM 5B50,BETHESDA,MD 20892. USN HOSP,NCI,MED ONCOL BRANCH,BETHESDA,MD 20892. RI Takahashi, Takashi/I-7262-2014 NR 12 TC 24 Z9 25 U1 0 U2 0 PU EATON PUBLISHING CO PI NATICK PA 154 E. CENTRAL ST, NATICK, MA 01760 SN 0736-6205 J9 BIOTECHNIQUES JI Biotechniques PD AUG PY 1991 VL 11 IS 2 BP 166 EP & PG 0 WC Biochemical Research Methods; Biochemistry & Molecular Biology SC Biochemistry & Molecular Biology GA GB875 UT WOS:A1991GB87500004 PM 1931011 ER PT J AU DEA, JY VANBISE, W RAUSCHER, EA BOERNER, WM AF DEA, JY VANBISE, W RAUSCHER, EA BOERNER, WM TI OBSERVATIONS OF ELF (EXTREMELY LOW-FREQUENCY) SIGNATURES ARISING FROM SPACE-VEHICLE DISTURBANCES OF THE IONOSPHERE SO CANADIAN JOURNAL OF PHYSICS LA English DT Article ID FIELD; MAGNETOSPHERE AB We report on observations of extremely low-frequency (ELF) signatures during exit or reentry of space vehicles through the ionosphere. The two modes regularly observed gave signals that peaked at 5.6 and 11.2 Hz. The evidence points to the lower ionosphere, i.e., the D- and E-layers, as the generator of these signals. The measurements were performed using ground-based multiturn coil sensors located in Reno and San Diego. The nature of these signals is unclear at present but it is surmised that we are detecting either the evanescent fields of hydromagnetic waves traveling in the ionosphere or the oscillating geomagnetic field associated with these hydromagnetic waves. C1 UNIV ILLINOIS,EECS,COMMUN & SENSING LAB,CHICAGO,IL 60680. USN,CTR OCEAN SYST,SAN DIEGO,CA 92152. MAGTEK LAB,RENO,NV 89506. NR 22 TC 2 Z9 2 U1 0 U2 0 PU NATL RESEARCH COUNCIL CANADA PI OTTAWA PA RESEARCH JOURNALS, MONTREAL RD, OTTAWA ON K1A 0R6, CANADA SN 0008-4204 J9 CAN J PHYS JI Can. J. Phys. PD AUG-SEP PY 1991 VL 69 IS 8-9 BP 959 EP 965 PG 7 WC Physics, Multidisciplinary SC Physics GA GR975 UT WOS:A1991GR97500008 ER PT J AU DEA, JY RICHMAN, CI BOERNER, WM AF DEA, JY RICHMAN, CI BOERNER, WM TI OBSERVATIONS OF SEISMO-ELECTROMAGNETIC EARTHQUAKE PRECURSOR RADIATION SIGNATURES ALONG SOUTHERN CALIFORNIAN FAULT ZONES - EVIDENCE OF LONG-DISTANCE PRECURSOR ULTRA-LOW FREQUENCY SIGNALS OBSERVED BEFORE A MODERATE SOUTHERN CALIFORNIA EARTHQUAKE EPISODE SO CANADIAN JOURNAL OF PHYSICS LA English DT Article ID IONOSPHERE; MAGNETOSPHERE; MECHANISM; EMISSIONS; ERUPTION; WAVES AB Although questioned for a long time, there is accumulating growing evidence for the existence of detectable seismo-electromagnetic phenomena worldwide. California is geologically as well as seismically a unique region for studying these phenomena in depth; and, in particular, the southern California geologic province with a multitude of offshore and inland fault zones with San Diego in its center. At the Naval Ocean Systems Center Low Frequency Noise Laboratory, San Diego CA., we monitor 0.1-10 Hz ultra-low frequency (ULF) and 10-40 Hz extremely low-frequency (ELF) signals using mu-metal loaded multiturn search coil sensors, as well as 10-100 kHz very low-frequency signals using large 1m diameter loop antennas. We have observed precursor seismo-electromagnetic emissions of several earthquake events. In this paper, we report on observations of broadband ULF signals before and during the Upland quake of April 17, 1990 (M(s) = 4.6), centered 200 km N of San Diego. The signals were detected with the vertically oriented search coil sensor and not with the horizontally oriented sensors, which suggests a disturbed ionosphere as the most likely source of these signals. The large prequake ULF activity, the rapid decay of ULF activity after the quake, and the absence of any geomagnetic storms indicate a good correlation of the ULF activity with the Upland quake. Although the exact mechanisms for coupling geologic activity to the ionosphere is not known, we cite a number of hypotheses concerning these mechanisms. Based on this succinct overview, an interpretation of our radio observations of seismic activity is presented and extended to earthquake precursor or predictor studies. We are in the process of expanding this research with the building of more monitoring stations and the improvement of our measurement, data collection, formatting, and data processing capabilities. C1 UNIV ILLINOIS,EECS,COMMUN & SENSING LAB,CHICAGO,IL 60680. RP DEA, JY (reprint author), USN,CTR OCEAN SYST,SAN DIEGO,CA 92152, USA. NR 36 TC 15 Z9 15 U1 4 U2 15 PU NATL RESEARCH COUNCIL CANADA PI OTTAWA PA RESEARCH JOURNALS, MONTREAL RD, OTTAWA ON K1A 0R6, CANADA SN 0008-4204 J9 CAN J PHYS JI Can. J. Phys. PD AUG-SEP PY 1991 VL 69 IS 8-9 BP 1138 EP 1145 PG 8 WC Physics, Multidisciplinary SC Physics GA GR975 UT WOS:A1991GR97500030 ER PT J AU COHEN, ME ARTHUR, JS AF COHEN, ME ARTHUR, JS TI RANDOMIZATION ANALYSIS OF DENTAL DATA CHARACTERIZED BY SKEW AND VARIANCE HETEROGENEITY SO COMMUNITY DENTISTRY AND ORAL EPIDEMIOLOGY LA English DT Article DE STATISTICS; RESEARCH; DENTISTRY ID TESTS AB Many distributions of dental variables exhibit positive skew and variance heterogeneity. Although the use of parametric tests on data with these disturbances usually does not pose a problem with respect to alpha error level, transformation of data sometimes increases power. Occasionally one or both of these expectations do not hold and it becomes problematic as to whether data should be transformed and which analyses should be considered valid. Simulated dental trials were conducted on independent samples (n = 25 per group) drawn from exponential distributions with the same or different population means. t-tests on raw, log, and square root transformed data; the Mann-Whitney-Wilcoxon ranking test; and a randomization test, all exhibited satisfactory levels of alpha error but the randomization test exhibited the greatest power followed closely by the t-test on raw scores. The present results demonstrate that the log transformation does not increase power for all forms of positively skewed data. Randomization test, not being subject to normality and variance homogeneity assumptions, may yield greater confidence in validity in these cases. Some implications for analytical strategy are discussed. RP COHEN, ME (reprint author), USN,DENT RES INST,BLDG 1-H,GREAT LAKES,IL 60088, USA. NR 16 TC 5 Z9 5 U1 0 U2 1 PU MUNKSGAARD INT PUBL LTD PI COPENHAGEN PA 35 NORRE SOGADE, PO BOX 2148, DK-1016 COPENHAGEN, DENMARK SN 0301-5661 J9 COMMUNITY DENT ORAL JI Community Dentist. Oral Epidemiol. PD AUG PY 1991 VL 19 IS 4 BP 185 EP 189 DI 10.1111/j.1600-0528.1991.tb00143.x PG 5 WC Dentistry, Oral Surgery & Medicine; Public, Environmental & Occupational Health SC Dentistry, Oral Surgery & Medicine; Public, Environmental & Occupational Health GA FX562 UT WOS:A1991FX56200001 PM 1889188 ER PT J AU MUNN, RS DEVEREUX, OF AF MUNN, RS DEVEREUX, OF TI NUMERICAL MODELING AND SOLUTION OF GALVANIC CORROSION SYSTEMS .1. GOVERNING DIFFERENTIAL-EQUATION AND ELECTRODIC BOUNDARY-CONDITIONS SO CORROSION LA English DT Article DE GALVANIC CORROSION; COMPUTER CALCULATIONS; CORROSION RATE; DIFFERENTIAL EQUATION; BOUNDARY CONDITIONS; ELECTRODE KINETICS; FINITE ELEMENT METHOD; POLARIZATION CURVE; PREDICTIVE CALCULATIONS AB This is the first in a pair of papers describing the development of the computational corrosion analysis accomplished at the Naval Underwater Systems Center and the University of Connecticut over the past decade. This paper outlines the mathematical representation of the corrosion problem to be solved in terms of the partial differential equation which describe electric fields in a conductive medium and the boundary conditions which describe the nonlinear electrode kinetics of corroding metals. A particular finite element formulation was developed to preserve charge conservation, a required condition to include mixed potential theory in electrochemical modeling. The mathematics analogy between electrical and thermal conduction was identified and a commercially available heat conduction computer program was selected and modified for electrochemical analysis by programming for the particular boundary conditions representing nonlinear electrode kinetics. C1 UNIV CONNECTICUT,DEPT MET,STORRS,CT 06268. RP MUNN, RS (reprint author), USN,CTR UNDERWATER SYST,DIV ENGN MECH,NEW LONDON,CT 06268, USA. NR 14 TC 27 Z9 30 U1 0 U2 5 PU NATL ASSN CORROSION ENG PI HOUSTON PA 1440 SOUTH CREEK DRIVE, HOUSTON, TX 77084-4906 SN 0010-9312 J9 CORROSION JI Corrosion PD AUG PY 1991 VL 47 IS 8 BP 612 EP 618 PG 7 WC Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Materials Science; Metallurgy & Metallurgical Engineering GA GT159 UT WOS:A1991GT15900006 ER PT J AU MUNN, RS DEVEREUX, OF AF MUNN, RS DEVEREUX, OF TI NUMERICAL MODELING AND SOLUTION OF GALVANIC CORROSION SYSTEMS .2. FINITE-ELEMENT FORMULATION AND DESCRIPTIVE EXAMPLES SO CORROSION LA English DT Article DE GALVANIC CORROSION; COMPUTER CALCULATIONS; FINITE ELEMENT FORMULATION; BIMETALLIC; CATHODIC PROTECTION; ELECTRODE KINETICS; POLARIZATION CURVE; PREDICTIVE CALCULATIONS ID CELLS AB This is the second of two papers describing the method and application of numerical modeling of the galvanic corrosion problem. The first paper4 derived the partial differential equation and boundary conditions governing this phenomenon. This paper describes the formulation of the finite-element method to solve that boundary-value problem within an electrolyte medium and presents several descriptive examples of the application of this method to real situations. The method of galvanic modeling and analysis was demonstrated by the several examples. One problem simulated one of simple geometry and idealized linear electrode kinetics previously solved exactly in the literature. Two problems with measured results for correlation were solved, one of a laboratory-scale experiment with two dissimilar metals submerged in the electrolyte, and a second of a macroscopic field problem of a shipboard seawater tank with the electrolyte enclosed by wetted metals. All three demonstration problems predicted electrochemical potential distributions in very good agreement with the exact solution or measured results. It was concluded that the electrochemical modeling method developed in this research embodies both mixed potential theory and full electrodic behavior of metal/electrolyte systems with demonstrated accuracy. C1 UNIV CONNECTICUT,DEPT MET,STORRS,CT 06268. RP MUNN, RS (reprint author), USN,CTR UNDERWATER SYST,DIV ENGN MECH,NEW LONDON,CT 06320, USA. NR 40 TC 23 Z9 24 U1 2 U2 5 PU NATL ASSN CORROSION ENG PI HOUSTON PA 1440 SOUTH CREEK DRIVE, HOUSTON, TX 77084-4906 SN 0010-9312 J9 CORROSION JI Corrosion PD AUG PY 1991 VL 47 IS 8 BP 618 EP 634 PG 17 WC Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Materials Science; Metallurgy & Metallurgical Engineering GA GT159 UT WOS:A1991GT15900007 ER PT J AU LEE, RN NORR, MK JACOBUS, OJ LITTLE, BJ RAY, RI WAGNER, PA AF LEE, RN NORR, MK JACOBUS, OJ LITTLE, BJ RAY, RI WAGNER, PA TI COMPOSITION VARIATIONS IN COPPER-NICKEL BUTT WELDS SO CORROSION LA English DT Article DE BUTT WELD; COPPER NICKEL; MICROSEGREGATION SURFACE ANALYSES ID CORROSION; ALLOYS AB Metallic segregation was documented in butt-welded CDA(1) 706 (UNS(2) C70600) copper-nickel piping. The weld bead, melt zone, and loosely adherent surface material were enriched in copper. Nickel-rich areas were identified under loosely adherent surface material. C1 CRADDOCK HEYER & ASSOCIATES,KINGWOOD,TX 77339. USN,OCEANOG & ATMOSPHER RES LAB,STENNIS SPACE CTR,MS 39529. COPPER DEV ASS,NEW YORK,NY. RP LEE, RN (reprint author), USN,CTR SURFACE WARFARE,SILVER SPRING,MD 20903, USA. NR 21 TC 0 Z9 0 U1 0 U2 1 PU NATL ASSN CORROSION ENG PI HOUSTON PA 1440 SOUTH CREEK DRIVE, HOUSTON, TX 77084-4906 SN 0010-9312 J9 CORROSION JI Corrosion PD AUG PY 1991 VL 47 IS 8 BP 645 EP 652 PG 8 WC Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Materials Science; Metallurgy & Metallurgical Engineering GA GT159 UT WOS:A1991GT15900009 ER PT J AU MARRONE, MJ KERSEY, AD AF MARRONE, MJ KERSEY, AD TI VISIBILITY LIMITS IN FIBEROPTIC MICHELSON INTERFEROMETER WITH BIREFRINGENCE COMPENSATION SO ELECTRONICS LETTERS LA English DT Article DE FIBER OPTICS; POLARIZATION; INTERFEROMETERS ID POLARIZATION AB The operation of a polarisation-insensitive fibre optic Michelson interferometer is further analysed. In particular, details are reported of an investigation of the limits in interference fringe visibility of the system due to offsets in the rotation angle of the Faraday elements used to effect the birefringence compensation. RP MARRONE, MJ (reprint author), USN,RES LAB,OPT TECH BRANCH,CODE 6574,WASHINGTON,DC 20375, USA. NR 6 TC 8 Z9 12 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 AUG 1 PY 1991 VL 27 IS 16 BP 1422 EP 1424 DI 10.1049/el:19910892 PG 3 WC Engineering, Electrical & Electronic SC Engineering GA GA633 UT WOS:A1991GA63300016 ER PT J AU ANDERSON, RA BRYDEN, NA POLANSKY, MM THORP, JW AF ANDERSON, RA BRYDEN, NA POLANSKY, MM THORP, JW TI EFFECTS OF CARBOHYDRATE LOADING AND UNDERWATER EXERCISE ON CIRCULATING CORTISOL, INSULIN AND URINARY LOSSES OF CHROMIUM AND ZINC SO EUROPEAN JOURNAL OF APPLIED PHYSIOLOGY AND OCCUPATIONAL PHYSIOLOGY LA English DT Article DE TRACE ELEMENTS; EXERCISE CAPACITY; TRACE METAL LOSSES; IMMERSION EXERCISE ID MUSCLE GLYCOGEN; EXCRETION; SERUM; DIET; GLUCOSE; COPPER AB The effects of carbohydrate loading on relative stress responses of eight male subjects performing intermittent leg exercise at 80% maximum oxygen consumption during headout immersion in 25-degrees-C water were tested. Carbohydrate loading increased the number of work cycles completed, with less physical stress compared with that completed following the control diet period. Pre-exercise serum cortisol values were similar on both diets prior to exercise but following exercise control values were greater (1152, 94 vs 858, 77 nmol l-1; mean, SEM). Chromium losses, which have been shown to correlate with stress, were lower during the carbohydrate loading period, 8.6, 1.3 vs 12.4, 2.0 ng h-1, and were correlated with post-exercise serum cortisol. Urinary zinc losses were also lower during carbohydrate loading, while urinary losses of potassium, magnesium and calcium remained constant. Insulin values decreased similarly following exercise in both groups and were not altered by carbohydrate loading. These data demonstrate that carbohydrate loading increases immersion exercise output with less stress as determined by serum cortisol and urinary chromium losses. C1 USN,INST MED RES,BETHESDA,MD 20889. RP ANDERSON, RA (reprint author), USDA ARS,BELTSVILLE AGR RES CTR,BELTSVILLE HUMAN NUTR RES CTR,VITAMIN & MINERAL NUTR LAB,BELTSVILLE,MD 20705, USA. NR 30 TC 43 Z9 43 U1 3 U2 4 PU SPRINGER VERLAG PI NEW YORK PA 175 FIFTH AVE, NEW YORK, NY 10010 SN 0301-5548 J9 EUR J APPL PHYSIOL O JI Eur. J. Appl. Physiol. Occup. Physiol. PD AUG PY 1991 VL 63 IS 2 BP 146 EP 150 DI 10.1007/BF00235185 PG 5 WC Physiology; Sport Sciences SC Physiology; Sport Sciences GA GD644 UT WOS:A1991GD64400013 PM 1748106 ER PT J AU MONROY, RL DAVIS, TA DONAHUE, RE MACVITTIE, TJ AF MONROY, RL DAVIS, TA DONAHUE, RE MACVITTIE, TJ TI INVIVO STIMULATION OF PLATELET PRODUCTION IN A PRIMATE MODEL USING IL-1 AND IL-3 SO EXPERIMENTAL HEMATOLOGY LA English DT Article DE PLATELETS; MEGAKARYOCYTES; PRIMATES; INTERLEUKIN-1; INTERLEUKIN-3; INVIVO ID FORMING UNIT-MEGAKARYOCYTE; COLONY FORMATION; RECOMBINANT; MICE; INTERLEUKIN-6; HEMATOPOIESIS; CELLS; PURIFICATION; PROGENITORS AB The in vivo administration of various cytokines for hematopoietic stimulation has led primarily to the enhancement of the myeloid response with an insignificant contribution toward stimulating any increase in platelet production. Current studies have suggested that interleukin 1 (IL-1) and interleukin 3 (IL-3) are two of several factors that have an effect on either megakaryocyte formation or platelet production. The objective of our research was to investigate how the in vivo administration of IL-1 or IL-3 or a combination could be used to regulate megakaryocytopoiesis and platelet production in nonhuman primates. A single dose of IL-1 was able to stimulate an increase in platelet production for 3 weeks. The response was shown to be biphasic, with increased platelet counts of 46% and 49% above baseline on days 8 and 17, respectively. In contrast, the administration of IL-3 for 6 days led to an increase of 29% above baseline on day 17. An interesting observation was that the increased platelet counts were accompanied by a transient increase in the peripheral blood of a highly proliferative megakaryocyte colony-forming cell (MK-CFC), which attained a maximum concentration on day 7. The administration of a sequential combination of IL-1, then IL-3, was further evaluated to elucidate a possible potentiation on platelet production. The result was a similar increase in platelets to that observed in IL-1-only-treated monkeys for the first 7 days. However, the most significant effect was observed on day 17, when the 85% increase in platelets was demonstrated to be additive of the single-agent effects on that day. A reversal in the order of cytokine administration did not affect platelet production in this manner. In IL-1, then IL-3-treated monkeys, the increased platelet counts were also accompanied by an increase in the concentration of the peripheral blood MK-CFC from days 7 through 14. These results demonstrate that a combination of factors may be required to enhance platelet production, stimulating not only the formation of megakaryocytes but also stimulating the production and release of platelets into the peripheral blood. C1 GENET INST,CAMBRIDGE,MA. ARMED FORCES RADIOBIOL RES INST,DEPT EXPTL HEMATOL,BETHESDA,MD 20814. RP MONROY, RL (reprint author), USN,MED RES INST,DEPT IMMUNOBIOL & TRANSPLANTAT,BETHESDA,MD 20889, USA. NR 35 TC 19 Z9 19 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 AUG PY 1991 VL 19 IS 7 BP 629 EP 635 PG 7 WC Hematology; Medicine, Research & Experimental SC Hematology; Research & Experimental Medicine GA FX639 UT WOS:A1991FX63900007 PM 1893949 ER PT J AU BERNHARDT, PA SCALES, WA GRACH, SM KEROSHTIN, AN KOTIK, DS POLYAKOV, SV AF BERNHARDT, PA SCALES, WA GRACH, SM KEROSHTIN, AN KOTIK, DS POLYAKOV, SV TI EXCITATION OF ARTIFICIAL AIRGLOW BY HIGH-POWER RADIO-WAVES FROM THE SURA IONOSPHERIC HEATING FACILITY SO GEOPHYSICAL RESEARCH LETTERS LA English DT Article ID CAVITIES AB The SURA facility for generation of high power radio waves, located near the village of Vasil'sursk USSR, operates between 4.5 and 9.0 MHz and has a maximum effective radiated power (ERP) of 300 MW. Nonlinear interactions between the HF radio waves and F-layer plasma occur near the electromagnetic wave reflection point. Energetic electrons are accelerated out of the interaction regions by the electrostatic waves. Ambient oxygen atoms collisionally excited by these suprathermal electrons yield enhanced airglow. Low-light-level, optical measurements were made at SURA during September 1990. Images of enhanced red-line (630 nm) emissions were recorded during radio wave transmissions at 4.786, 5.455, and 5.828 MHz. The antenna radiation pattern, ionospheric irregularities, and the magnetic field orientation affected the shape of the observed airglow structures. The airglow clouds drifted across the night sky, disappeared, and reformed at the zenith of the antenna array. This has been interpreted in terms of radio beam refraction in drifting plasma irregularities and bifurcation when the beam is split between two density cavities. Subject to clear skies, our experience indicates that the low-light-level-imaging technique is a reliable method to study large scale irregularities and electron acceleration with high-power HF transmitting facilities. RP BERNHARDT, PA (reprint author), USN,RES LAB,F36T,SPACE PLASMA BRANCH,CODE 4780,WASHINGTON,DC 20375, USA. NR 15 TC 39 Z9 39 U1 0 U2 5 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 AUG PY 1991 VL 18 IS 8 BP 1477 EP 1480 DI 10.1029/91GL01847 PG 4 WC Geosciences, Multidisciplinary SC Geology GA GB150 UT WOS:A1991GB15000027 ER PT J AU HOLLAND, DL CHEN, J AF HOLLAND, DL CHEN, J TI EFFECTS OF COLLISIONS ON THE NONLINEAR PARTICLE DYNAMICS IN THE MAGNETOTAIL SO GEOPHYSICAL RESEARCH LETTERS LA English DT Article ID RECONNECTION FIELD GEOMETRY; GEOMAGNETIC TAIL; CURRENT SHEET; DISTRIBUTIONS; ORBITS; MODEL AB The effects of collisional processes on the nonlinear particle dynamics in the magnetotail are considered. A simple collision operator is developed to model the effects of pitch-angle and energy scattering. It is found that the phase space partition persists for up to moderate scattering amplitudes in pitch-angle and energy, and that certain distribution function features are robust even in the presence of large amplitude collisions. It is shown that if the collisions are due to short scale length electrostatic fields, excessively large field amplitudes are required to significantly alter the phase space structures and the resulting distribution function features. RP HOLLAND, DL (reprint author), USN,RES LAB,DIV PLASMA PHYS,SPACE PLASMA BRANCH,CODE 4781,WASHINGTON,DC 20375, USA. NR 16 TC 21 Z9 21 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 AUG PY 1991 VL 18 IS 8 BP 1579 EP 1582 DI 10.1029/91GL01151 PG 4 WC Geosciences, Multidisciplinary SC Geology GA GB150 UT WOS:A1991GB15000053 ER PT J AU OCHADLICK, AR AF OCHADLICK, AR TI MAGNETIC EXPLORATION OF OCEAN CRUST FOR CRATERS OF IMPACT ORIGIN - MODEL RESULTS SO GEOPHYSICS LA English DT Article AB Magnetic data sets over deep ocean areas may contain clues to the existence of craters formed by the impact of an extraterrestrial body with the Earth's ocean crust. To aid in the magnetic exploration of the ocean crust for oceanic impact craters, basic but effective computations from an impact model are studied from an aeromagnetic point of view. The main assumption of the analysis is that a sufficiently large impact can excavate large volumes of magnetized basalt, vaporize basalt, and raise basalt to temperatures above the Curie temperature (approximately 500-degrees-C) to alter the preimpact magnetization of the ocean floor and result in a magnetic anomaly being associated with an oceanic impact crater. In the absence of an existing theory on the influence of impacts on ocean crustal magnetization, the representation of a crater on the ocean floor by a simple potential provides, apparently for the first time, quantitative estimates of the crater's magnetic anomaly along a horizontal surface. Numerical results from the model suggest that the detection of the anomaly of a Cretaceous-Tertiary (K-T) type of impact is well within the capabilities of aeromagnetic technology. RP OCHADLICK, AR (reprint author), USN,CTR AIR DEV,CODE 5024,WARMINSTER,PA 18974, USA. NR 16 TC 2 Z9 2 U1 0 U2 0 PU SOC EXPLORATION GEOPHYSICISTS PI TULSA PA 8801 S YALE ST, TULSA, OK 74137 SN 0016-8033 J9 GEOPHYSICS JI Geophysics PD AUG PY 1991 VL 56 IS 8 BP 1153 EP 1157 DI 10.1190/1.1443134 PG 5 WC Geochemistry & Geophysics SC Geochemistry & Geophysics GA FZ996 UT WOS:A1991FZ99600002 ER PT J AU IOANNOU, DE ZHONG, XD MAZHARI, B CAMPISI, GJ HUGHES, HL AF IOANNOU, DE ZHONG, XD MAZHARI, B CAMPISI, GJ HUGHES, HL TI INTERFACE CHARACTERIZATION OF FULLY DEPLETED SOI MOSFETS BY THE DYNAMIC TRANSCONDUCTANCE TECHNIQUE SO IEEE ELECTRON DEVICE LETTERS LA English DT Letter ID FILM AB The dynamic transconductance technique of MOSFET interface characterization is adapted to fully depleted SOI transistors and is used to measure the interface-state density energy profiles in several SIMOX transistors. By making measurements first with the current flowing through the channel under measurement and then through the opposite channel, much of the energy gap (from accumulation to well into weak inversion) can be probed. Remarkably high sensitivity is achieved by utilizing the imaginary part of the dynamic transconductance. Measured interface trap densities were in the region of approximately 10(10)-10(11)eV-1.cm-2. C1 UNIV ILLINOIS,COORDINATED SCI LAB,URBANA,IL 61801. USN,RES LAB,WASHINGTON,DC 20375. RP IOANNOU, DE (reprint author), GEORGE MASON UNIV,DEPT ELECT & COMP ENGN,FAIRFAX,VA 22030, USA. NR 12 TC 11 Z9 11 U1 0 U2 3 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0741-3106 J9 IEEE ELECTR DEVICE L JI IEEE Electron Device Lett. PD AUG PY 1991 VL 12 IS 8 BP 430 EP 432 DI 10.1109/55.119155 PG 3 WC Engineering, Electrical & Electronic SC Engineering GA FY529 UT WOS:A1991FY52900011 ER PT J AU GEIS, MW EFREMOW, NN WOODHOUSE, JD MCALEESE, MD MARCHYWKA, M SOCKER, DG HOCHEDEZ, JF AF GEIS, MW EFREMOW, NN WOODHOUSE, JD MCALEESE, MD MARCHYWKA, M SOCKER, DG HOCHEDEZ, JF TI DIAMOND COLD-CATHODE SO IEEE ELECTRON DEVICE LETTERS LA English DT Letter ID ELECTRON-EMISSION; SURFACES AB Diamond cold cathodes have been formed by fabricating mesa-etched diodes using carbon ion implantation into p-type diamond substrates. When these diodes are forward biased, current is emitted into vacuum. The cathode efficiency (emitted current divided by diode current) varies from 2 x 10(-4) to 1 x 10(-10) and increases with the addition of 10(-2)-torr partial pressure of O2 into the vacuum system. Current densities of 0.1 to 1 A.cm-2 are estimated for a diode current of 10 mA. This compares favorably with Si cold cathodes (not coated with Cs), which have efficiencies of approximately 2 x 10(-5) and current densities of approximately 2 x 10(-2) A.cm-2. We believe that higher current densities and efficiencies can be obtained with more efficient cathode designs and an ultrahigh-vacuum environment. C1 INTERFEROMETR INC,VIENNA,VA 22182. USN,RES LAB,WASHINGTON,DC 20375. UNIV SPACE RES ASSOC,WASHINGTON,DC 20024. RP GEIS, MW (reprint author), MIT,LINCOLN LAB,LEXINGTON,MA 02173, USA. NR 23 TC 275 Z9 278 U1 2 U2 15 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0741-3106 J9 IEEE ELECTR DEVICE L JI IEEE Electron Device Lett. PD AUG PY 1991 VL 12 IS 8 BP 456 EP 459 DI 10.1109/55.119164 PG 4 WC Engineering, Electrical & Electronic SC Engineering GA FY529 UT WOS:A1991FY52900020 ER PT J AU SCHEPS, R AF SCHEPS, R TI CR-LICAALF6 LASER PUMPED BY VISIBLE LASER-DIODES SO IEEE JOURNAL OF QUANTUM ELECTRONICS LA English DT Letter AB A Cr:LiCaAlF6 laser has been pumped for the first time using visible laser diodes. Two commercial 10 mW laser diodes were polarization combined to demonstrate lasing in a low loss resonator. In addition, a higher power 665 nm laser diode was used to pump the laser, producing 15.9 mW CW and 51.8 mW pulsed at 10 Hz. Optical characterization of the gain medium was performed using a dye laser. Gain, loss, slope efficiency, and the dependence of the threshold on pump wavelength are reported. RP SCHEPS, R (reprint author), USN,CTR OCEAN SYST,CODE 843,SAN DIEGO,CA 92152, USA. NR 7 TC 24 Z9 25 U1 0 U2 1 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0018-9197 J9 IEEE J QUANTUM ELECT JI IEEE J. Quantum Electron. PD AUG PY 1991 VL 27 IS 8 BP 1968 EP 1970 DI 10.1109/3.83405 PG 3 WC Engineering, Electrical & Electronic; Optics; Physics, Applied SC Engineering; Optics; Physics GA GC637 UT WOS:A1991GC63700003 ER PT J AU MORGAN, MA WALSH, NJ AF MORGAN, MA WALSH, NJ TI ULTRA-WIDE-BAND TRANSIENT ELECTROMAGNETIC SCATTERING LABORATORY SO IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION LA English DT Note AB A unique free-field transient scattering facility is described which employs a dual-channel ultra-wide-band impulsive source. Following a brief historical review, the theory and operational characteristics of the laboratory are discussed. New technical implementations are then described which have yielded significant improvement in effective bandwidth and signal-to-noise ratio (SNR). High quality experimental validations are shown, and consideration is given to future enhancements. RP MORGAN, MA (reprint author), NAVAL POST GRAD SCH,DEPT ELECT & COMP ENGN,MONTEREY,CA 93943, USA. NR 13 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 0018-926X J9 IEEE T ANTENN PROPAG JI IEEE Trans. Antennas Propag. PD AUG PY 1991 VL 39 IS 8 BP 1230 EP 1234 DI 10.1109/8.97361 PG 5 WC Engineering, Electrical & Electronic; Telecommunications SC Engineering; Telecommunications GA GJ761 UT WOS:A1991GJ76100024 ER PT J AU BRUNING, AM KASTURE, DG CAMPBELL, FJ TURNER, NH AF BRUNING, AM KASTURE, DG CAMPBELL, FJ TURNER, NH TI EFFECT OF CAVITY SUB-CORONA CURRENT ON POLYMER INSULATION LIFE SO IEEE TRANSACTIONS ON ELECTRICAL INSULATION LA English DT Article ID FILM AB Polymer insulation operated at voltages below critical inception voltage (CIV, corona inception voltage, partial discharge inception voltage) sometimes fail in a few months to a few years, showing the same physical appearance as partial discharge induced failures. Morphologic examination of polyethylene (PE) suggests that inhomogeneities may provide electrical conducting paths to polymer cavities. Hence, the authors performed calculations and experiments applying voltage to a test cell simulating a high-resistance conducting path in series with a cavity in PE. These experiments generated chemical changes on the surface wall of the cavities for both sub-corona currents (currents produced by voltage below CIV) and corona currents in different cavities. X-ray photoelectron spectroscopy (XPS) spectra of the cavity surface chemical species indicate similar moieties (functional groups), implying that sub-corona current or discharge is causing failures similar to corona insulation failures. The longer time for the sub-corona species to develop is consistent with field failure occurrence within a few months to a few years. Finally, the authors develop electric field conditions favorable to the existence of sub-corona currents at relatively low voltage. C1 USN,RES LAB,WASHINGTON,DC 20375. RP BRUNING, AM (reprint author), LECTROMECH DESIGN CO,HERNDON,VA, USA. NR 24 TC 22 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 0018-9367 J9 IEEE T ELECTR INSUL PD AUG PY 1991 VL 26 IS 4 BP 826 EP 836 DI 10.1109/14.83709 PG 11 WC Engineering, Electrical & Electronic SC Engineering GA GE339 UT WOS:A1991GE33900042 ER PT J AU GANGULY, AK KROWNE, CM AF GANGULY, AK KROWNE, CM TI CHARACTERISTICS OF MICROSTRIP TRANSMISSION-LINES WITH HIGH-DIELECTRIC-CONSTANT SUBSTRATES SO IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES LA English DT Article ID CHARACTERISTIC IMPEDANCE; THIN-FILMS; PROPAGATION AB An efficient numerical code is developed from a full-wave analysis in the Fourier transform domain to determine the characteristics of a single-strip or multistrip coplanar transmission line. Modes of both even and odd symmetries are included. The impedance of the transmission line is calculated using the power-current equivalent model. Coupling constants between the even and the odd modes are also calculated. Results are provided for a shielded two-strip coupled microstrip transmission line on high-dielectric-constant substrate such as lanthanum aluminate with applications to superconducting transmission lines. RP GANGULY, AK (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 15 TC 2 Z9 2 U1 0 U2 1 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0018-9480 J9 IEEE T MICROW THEORY JI IEEE Trans. Microw. Theory Tech. PD AUG PY 1991 VL 39 IS 8 BP 1329 EP 1337 DI 10.1109/22.85408 PG 9 WC Engineering, Electrical & Electronic SC Engineering GA FV890 UT WOS:A1991FV89000011 ER PT J AU BIEDENBENDER, MD KAPOOR, VJ SHALKHAUSER, KA MESSICK, LJ NGUYEN, R SCHMITZ, D JURGENSEN, H AF BIEDENBENDER, MD KAPOOR, VJ SHALKHAUSER, KA MESSICK, LJ NGUYEN, R SCHMITZ, D JURGENSEN, H TI SUBMICRON-GATE INP POWER MISFETS WITH IMPROVED OUTPUT POWER-DENSITY AT 18 AND 20 GHZ SO IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES LA English DT Article ID MICROWAVE; MESFETS; MM AB Presented here are the microwave characteristics at 18 and 20 GHz of submicron-gate indium phosphide (InP) metal-insulator-semiconductor field-effect transistors (MISFET's) for high output power density applications. InP power MISFET's were fabricated with 0.7-mu-m gate lengths, 0.2 mm gate widths, and drain-source spacings of 2, 3, and 5-mu-m. The output power density was investigated as a function of drain-source spacing. The best output power density and gain were obtained for drain-source spacings of 3-mu-m. At 18 GHz output power densities of 1.59 W/mm with a gain of 3.47 dB and a power-added efficiency of 20.0% were obtained for a drain-source spacing of 3-mu-m. At 20 GHz output power densities of 1.20 W/mm with a gain of 3.17 dB and a power-added efficiency of 13.6% were obtained for a drain-source spacing of 3-mu-m. The output power density is 2.7 times greater than has previously been measured for InP MISFET's at 18 and 20 GHz, and the power-added efficiency has also been increased. The output power density is also 50% better than recently reported for comparable gate width pseudomorphic HEMT's at 20 GHz. The power gain was stable to within 3.0% over 12 h, and the drain current variation during the same time was less than 5%. C1 AIXTRON CORP, AACHEN, GERMANY. NASA, LEWIS RES CTR, CLEVELAND, OH 44135 USA. USN, CTR OCEAN SYST, SAN DIEGO, CA 92152 USA. RP UNIV CINCINNATI, DEPT ELECT & COMP ENGN, CINCINNATI, OH 45221 USA. NR 24 TC 6 Z9 6 U1 1 U2 2 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI PISCATAWAY PA 445 HOES LANE, PISCATAWAY, NJ 08855-4141 USA SN 0018-9480 EI 1557-9670 J9 IEEE T MICROW THEORY JI IEEE Trans. Microw. Theory Tech. PD AUG PY 1991 VL 39 IS 8 BP 1368 EP 1375 DI 10.1109/22.85412 PG 8 WC Engineering, Electrical & Electronic SC Engineering GA FV890 UT WOS:A1991FV89000015 ER PT J AU PARK, GS GRANATSTEIN, VL LATHAM, PE ARMSTRONG, CM GANGULY, AK PARK, SY AF PARK, GS GRANATSTEIN, VL LATHAM, PE ARMSTRONG, CM GANGULY, AK PARK, SY TI PHASE-STABILITY OF GYROKLYSTRON AMPLIFIER SO IEEE TRANSACTIONS ON PLASMA SCIENCE LA English DT Article ID COLLIDERS; DESIGN AB Expressions are derived for RF phase stability in conventional klystrons and gyroklystrons. Phase noise is found to depend on electron energy in a completely different way for the two types of devices due to the inherent differences in gun dynamics and interaction mechanisms. In general, phase stability is better in gyroklystron operating at voltage less-than-or-equal-to 100 kV, while klystrons have somewhat better phase stability at higher operating voltage. An experimental study of phase stability in a four-cavity, 7.5-kV conventional klystron and in a three-cavity, 30-kV gyroklystron confirmed theoretical predictions. Phase sensitivity in the conventional klystron was 13-degrees per percent change in voltage, and in the gyroklystron was 4-degrees per percent change in voltage. The magnitude and frequency of the measured phase jitter was well correlated with the droop and ripple on the beam voltage. Phase sensitivity to other parameters such as input power, magnetic field strength, and input frequency were also studied experimentally. C1 UNIV MARYLAND,PLASMA RES LAB,COLLEGE PK,MD 20742. USN,RES LAB,WASHINGTON,DC 20375. POHANG INST SCI & TECHNOL,POHANG,SOUTH KOREA. RI Park, Gunsik/A-1415-2014 NR 13 TC 11 Z9 11 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 0093-3813 J9 IEEE T PLASMA SCI JI IEEE Trans. Plasma Sci. PD AUG PY 1991 VL 19 IS 4 BP 632 EP 640 DI 10.1109/27.90329 PG 9 WC Physics, Fluids & Plasmas SC Physics GA GE845 UT WOS:A1991GE84500011 ER PT J AU RYAN, JJ LEJEUNE, HB MOND, JJ FINKELMAN, FD AF RYAN, JJ LEJEUNE, HB MOND, JJ FINKELMAN, FD TI ALLOSTIMULATORY ANALYSIS OF A NEWLY-DEFINED AND WIDELY-DISTRIBUTED MLS SUPERANTIGEN SO IMMUNOGENETICS LA English DT Article ID MAJOR HISTOCOMPATIBILITY COMPLEX; LYMPHOCYTE-STIMULATING DETERMINANTS; T-CELL RECOGNITION; MHC GENE-PRODUCTS; INVITRO PRESENTATION; NEGATIVE SELECTION; CLONAL DELETION; LOCUS ANTIGENS; IMMUNE DEFECT; I-E AB We previously noted that Mls(a, c) C58/J responder cells proliferated unexpectedly to H-2k-compatible Mls(a) or Mls(c) prototypic stimulator cells in a primary mixed lymphocyte reaction. The present investigation was performed to evaluate whether the response of C58/J T cells to these H-2- and Mls-compatible stimulator cells could functionally identify a newly-defined member of the Mls superantigen family through its allostimulatory ability. We observed that C58/J responder cells also proliferated when cultured with H-2-compatible prototypic Mls(null), Mls(b) (nonstimulatory), or Mls(a, c) splenic stimulator cells. The widely distributed nature of the non-MHC ligand recognized by C58/J T cells is indicated by the finding that 11 of 12 H-2k inbred mouse strains clearly expressed this specificity. A gradient of stimulatory capacity from low to high across this newly-defined non-MHC difference was detected with splenocytes from these different inbred mouse strains. The Mls(a, c) genetic composition of C58/J was confirmed by the observation that crossing C58/J with parental B10.BR (responsive to both Mls(a) and Mls(c) determinants) generated F1 progeny that were unresponsive to H-2k-compatible Mls(a), Mls(c), or Mls(a, c) stimulator cells. Like prototypic Mls(a) and Mls(c), the non-MHC specificity recognized by C58/J responder cells, termed Mls(f), was particularly sensitive to radiation (versus mitomycin C) treatment of the stimulator cells, was greatly augmented after anti-IgD activation of splenic stimulator cells, was blocked with anti-MHC class II antibody, and was effectively presented by phenotypically normal female but not B cell-defective xid+ male CBA/N F1 stimulator cells. C1 UNIFORMED SERV UNIV HLTH SCI,DEPT MED,BETHESDA,MD 20814. RP RYAN, JJ (reprint author), USN,INST MED RES,DEPT IMMUNOBIOL & TRANSPLANTAT,MAIL STOP 6,ROCKVILLE PIKE,BETHESDA,MD 20889, USA. FU NIAID NIH HHS [R01-AI21328] NR 47 TC 8 Z9 8 U1 0 U2 0 PU SPRINGER VERLAG PI NEW YORK PA 175 FIFTH AVE, NEW YORK, NY 10010 SN 0093-7711 J9 IMMUNOGENETICS JI Immunogenetics PD AUG PY 1991 VL 34 IS 2 BP 88 EP 100 PG 13 WC Genetics & Heredity; Immunology SC Genetics & Heredity; Immunology GA GA190 UT WOS:A1991GA19000003 PM 1714422 ER PT J AU WU, SJL PACHECO, ND OPRANDY, JJ ROLLWAGEN, FM AF WU, SJL PACHECO, ND OPRANDY, JJ ROLLWAGEN, FM TI IDENTIFICATION OF CAMPYLOBACTER-JEJUNI AND CAMPYLOBACTER-COLI ANTIGENS WITH MUCOSAL AND SYSTEMIC ANTIBODIES SO INFECTION AND IMMUNITY LA English DT Article ID OUTER-MEMBRANE PROTEINS; ENTERITIS; INFECTION; COMMON; FLAGELLA AB The development of a rapid and specific diagnostic assay for Campylobacter infections is important in determining the etiology of acute diarrhea in humans. Studies have shown that sonicated whole bacteria or partially purified antigens cross-reacted with antibodies against other closely related bacteria. To solve the problems of specificity, we identified specific antigens of Campylobacter jejuni and Campylobacter coli for use in diagnostic assays. We investigated the responses of serum, urine, and intestinal lavage antibodies in infected (fed live bacteria) and parenterally immunized (intraperitoneal injection of sonicated whole bacteria with adjuvant) mice directed against C. jejuni or C. coli by Western blot (immunoblot) analysis. Antibody responses were examined weekly for up to 28 days. Fewer antigens were detected by urinary and intestinal lavage fluid immunoglobulin A (IgA) than serum IgG and IgM for both parenterally immunized and infected mice. Serum from parenterally immunized mice detected more antigens than that from infected mice. Two high-molecular-weight antigens (62,000 and 43,000) were predominantly detected by serum, urine, and intestinal lavage fluids of both parenterally immunized and infected mice. Serum antibodies from 28-day parenterally immunized mice detected one antigen specific to C. coli with a molecular weight of 38,000 and one antigen specific to C. jejuni with a molecular weight of 27,000. An immunodominant protein with a molecular weight of 31,000 common to both C. jejuni and C. coli was also recognized by serum antibodies from parenterally immunized mice. RP WU, SJL (reprint author), USN,MED RES INST,DEPT INFECT DIS,BETHESDA,MD 20889, USA. NR 24 TC 4 Z9 5 U1 0 U2 0 PU AMER SOC MICROBIOLOGY PI WASHINGTON PA 1325 MASSACHUSETTS AVENUE, NW, WASHINGTON, DC 20005-4171 SN 0019-9567 J9 INFECT IMMUN JI Infect. Immun. PD AUG PY 1991 VL 59 IS 8 BP 2555 EP 2559 PG 5 WC Immunology; Infectious Diseases SC Immunology; Infectious Diseases GA FY331 UT WOS:A1991FY33100007 PM 1855976 ER PT J AU FRANKS, AK KUJAWA, KI YAFFE, LJ AF FRANKS, AK KUJAWA, KI YAFFE, LJ TI EXPERIMENTAL ELIMINATION OF TUMOR-NECROSIS-FACTOR IN LOW-DOSE ENDOTOXIN MODELS HAS VARIABLE EFFECTS ON SURVIVAL SO INFECTION AND IMMUNITY LA English DT Article ID GALACTOSAMINE-INDUCED SENSITIZATION; HUMAN-ENDOTHELIAL CELLS; FACTOR ALPHA-CACHECTIN; BACTERIAL LIPOPOLYSACCHARIDE; LETHAL BACTEREMIA; INTERFERON-GAMMA; PROTECTS MICE; GROWTH-FACTOR; INTERLEUKIN-6; CARRAGEENAN AB Tumor necrosis factor alpha (TNF) is thought to play a major role in the pathogenesis of septic shock. Anti-TNF antibody was preadministered in low-dose endotoxin lethality models in which BALB/c mice were challenged with small amounts of lipopolysaccharide following their sensitization with either carrageenan (CAR) or D-galactosamine (D-GalN). Although the antibody virtually eliminated circulating TNF in both the CAR and the D-GalN models, only the D-GalN model mice were afforded survival, adding to a growing body of evidence that substances other than TNF play a key role in endotoxin-induced lethality. Further examination of sera from these mice showed a much greater elevation of interleukin-6 levels of the CAR-sensitized group than in the D-GalN-sensitized group. C1 UNIV TEXAS,AUSTIN,TX 78712. RP FRANKS, AK (reprint author), USN,MED RES INST,CASUALTY CARE RES DEPT,BETHESDA,MD 20889, USA. NR 46 TC 41 Z9 41 U1 0 U2 0 PU AMER SOC MICROBIOLOGY PI WASHINGTON PA 1325 MASSACHUSETTS AVENUE, NW, WASHINGTON, DC 20005-4171 SN 0019-9567 J9 INFECT IMMUN JI Infect. Immun. PD AUG PY 1991 VL 59 IS 8 BP 2609 EP 2614 PG 6 WC Immunology; Infectious Diseases SC Immunology; Infectious Diseases GA FY331 UT WOS:A1991FY33100015 PM 1855980 ER PT J AU RIVIERE, GR WEISZ, KS SIMONSON, LG LUKEHART, SA AF RIVIERE, GR WEISZ, KS SIMONSON, LG LUKEHART, SA TI PATHOGEN-RELATED SPIROCHETES IDENTIFIED WITHIN GINGIVAL TISSUE FROM PATIENTS WITH ACUTE NECROTIZING ULCERATIVE GINGIVITIS SO INFECTION AND IMMUNITY LA English DT Article ID TREPONEMA-PALLIDUM; MONOCLONAL-ANTIBODIES; DENTICOLA; IMMUNOLOGY AB The purpose of this investigation was to determine whether monoclonal antibodies against pathogen-restricted antigens of Treponema pallidum subsp. pallidum could be used as probes for spirochetes in diseased gingival tissue from subjects with acute necrotizing ulcerative gingivitis. A biotin-streptavidin system was used to identify spirochets bound by monoclonal antibodies in cryostat sections of tissue. Twelve of 16 tissue samples from diseased sites, but none of 8 tissue specimens from healthy sites, reacted with pathogen-restricted antibodies. Organisms were found in intact epithelium and connective tissues adjacent to ulcers. Staining intensity was often high in perivascular locations and around vesicular spaces. Monoclonal antibodies to Bacteroides gingivalis and Treponema denticola were each reactive with diseased gingival tissues, but staining was usually restricted to ulcerated areas. These studies extend recent observations that showed that subjects with acute necrotizing ulcerative gingivitis had both pathogen-related spirochetes in dental plaque and serum immunoglobulin G to pathogen-restricted antigens on T. pallidum subspecies, suggesting that pathogen-related spirochetes may be associated with the pathogenesis of certain periodontal diseases. C1 USN,CTR TRAINING,NAVAL DENT RES INST,GREAT LAKES,IL 60088. UNIV WASHINGTON,SCH MED,DEPT MED,SEATTLE,WA 98195. RP RIVIERE, GR (reprint author), OREGON HLTH SCI UNIV,SCH DENT,DEPT PEDIAT DENT,PORTLAND,OR 97201, USA. FU NIAID NIH HHS [AI-18988] NR 25 TC 51 Z9 51 U1 1 U2 2 PU AMER SOC MICROBIOLOGY PI WASHINGTON PA 1325 MASSACHUSETTS AVENUE, NW, WASHINGTON, DC 20005-4171 SN 0019-9567 J9 INFECT IMMUN JI Infect. Immun. PD AUG PY 1991 VL 59 IS 8 BP 2653 EP 2657 PG 5 WC Immunology; Infectious Diseases SC Immunology; Infectious Diseases GA FY331 UT WOS:A1991FY33100021 PM 1855985 ER PT J AU SATHE, SB JOHSI, Y AF SATHE, SB JOHSI, Y TI NATURAL-CONVECTION ARISING FROM A HEAT GENERATING SUBSTRATE-MOUNTED PROTRUSION IN A LIQUID-FILLED 2-DIMENSIONAL ENCLOSURE SO INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER LA English DT Article ID VERTICAL SURFACE; DEVICES AB An investigation of natural convection flow and heat transfer arising from a substrate-mounted protruding heat source immersed in a liquid-filled square enclosure is reported. The model considers heat transfer within the protrusion and substrate and the coupled natural convection in the fluid. Numerical predictions are obtained for a wide range of appropriate Rayleigh and Prandtl numbers and substrate to fluid thermal conductivity ratios that may be encountered in liquid-immersion cooling of electronic components. For many situations of interest prescribing simplistic heat transfer conditions at the solid surfaces is found inappropriate. Increasing the Rayleigh number beyond 10(6) and the substrate thermal conductivity beyond 100 times that of the liquid produces only a marginal decrease in the maximum temperatures. Computed protrusion surface temperatures compare favorably with available experimental results for a similar configuration. C1 NAVAL POST GRAD SCH, DEPT MECH ENGN, MONTEREY, CA 93943 USA. RP SATHE, SB (reprint author), IBM CORP, ENDICOTT, NY 13760 USA. NR 20 TC 31 Z9 31 U1 0 U2 2 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLAND SN 0017-9310 J9 INT J HEAT MASS TRAN JI Int. J. Heat Mass Transf. PD AUG PY 1991 VL 34 IS 8 BP 2149 EP 2163 DI 10.1016/0017-9310(91)90224-3 PG 15 WC Thermodynamics; Engineering, Mechanical; Mechanics SC Thermodynamics; Engineering; Mechanics GA GB171 UT WOS:A1991GB17100023 ER PT J AU SARPKAYA, T LINDSEY, PJ AF SARPKAYA, T LINDSEY, PJ TI UNSTEADY-FLOW ABOUT POROUS CHAMBERED SHELLS SO JOURNAL OF AIRCRAFT LA English DT Article AB A numerical simulation was carried out through the use of the vortex-element methods to investigate the characteristics of an impulsively started uniform flow, decelerating at prescribed rates about a two-dimensional cambered porous shell, with an included angle of 120 deg, for the purpose of understanding the effects of porosity on the conditions under which wake recontact occurs. RP SARPKAYA, T (reprint author), USN,POSTGRAD SCH,MONTEREY,CA 93943, USA. NR 0 TC 2 Z9 2 U1 0 U2 0 PU AMER INST AERONAUT ASTRONAUT PI RESTON PA 1801 ALEXANDER BELL DRIVE, STE 500, RESTON, VA 22091 SN 0021-8669 J9 J AIRCRAFT JI J. Aircr. PD AUG PY 1991 VL 28 IS 8 BP 502 EP 508 DI 10.2514/3.46055 PG 7 WC Engineering, Aerospace SC Engineering GA GB035 UT WOS:A1991GB03500004 ER PT J AU RODGERS, EB CHANG, SW STOUT, J STERANKA, J SHI, JJ AF RODGERS, EB CHANG, SW STOUT, J STERANKA, J SHI, JJ TI SATELLITE-OBSERVATIONS OF VARIATIONS IN TROPICAL CYCLONE CONVECTION CAUSED BY UPPER-TROPOSPHERIC TROUGHS SO JOURNAL OF APPLIED METEOROLOGY LA English DT Article ID ATLANTIC HURRICANE SEASON; ANGULAR-MOMENTUM; OUTFLOW LAYER; INTENSITY; INTENSIFICATION; ENVIRONMENT; FLUXES; MODEL AB The mutual adjustment between upper-tropospheric troughs and the structure of western Atlantic Tropical Cyclones Florence (1988) and Irene (1981) are analyzed using satellite and in situ data. Satellite-observed tracers (e.g., cirrus clouds, water vapor, and ozone) are used to monitor the circulation within the tropical cyclones' environment. The tropical cyclones' convection is inferred from satellite flown passive microwave and infrared sensors. In addition, numerical model simulations are used to analyze and interpret these satellite observations. The study suggests that the initiation and maintenance of intense convective outbreaks in these tropical cyclones during their mature stage are related to the channeling and strengthening of their outflow by upper-tropospheric troughs. The convection can be enhanced in response to the outflow jet-induced import of eddy relative angular momentum and ascending motion associated with the thermally direct circulation. The channeling and strengthening of the outflow occurs when the upper-tropospheric troughs are located in a favorable position relative to the tropical cyclones. Both Florence and Irene intensify after the onset of these intense convective episodes. Satellite observations also suggest that the cessation in the convection of the two tropical cyclones occurs when the upper-tropospheric troughs move near or over the tropical cyclones, resulting in the weakening of their outflow and the entrainment of dry upper-tropospheric air into their inner core. C1 USN,RES LAB,WASHINGTON,DC 20375. GEN SCI CORP,LAUREL,MD. N CAROLINA STATE UNIV,DEPT MARINE EARTH & ATMOSPHER SCI,RALEIGH,NC 27695. RP RODGERS, EB (reprint author), NASA,GODDARD SPACE FLIGHT CTR,ATMOSPHERES LAB,SEVERE STORMS BRANCH,CODE 912,GREENBELT,MD 20771, USA. NR 52 TC 25 Z9 26 U1 0 U2 2 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 AUG PY 1991 VL 30 IS 8 BP 1163 EP 1184 DI 10.1175/1520-0450(1991)030<1163:SOOVIT>2.0.CO;2 PG 22 WC Meteorology & Atmospheric Sciences SC Meteorology & Atmospheric Sciences GA GB987 UT WOS:A1991GB98700010 ER PT J AU NADELLA, RK RAO, MV SIMONS, DS CHI, PH FATEMI, M DIETRICH, HB AF NADELLA, RK RAO, MV SIMONS, DS CHI, PH FATEMI, M DIETRICH, HB TI HIGH-ENERGY SI IMPLANTATION INTO INP-FE SO JOURNAL OF APPLIED PHYSICS LA English DT Article ID N-TYPE; INDIUM-PHOSPHIDE; GAAS; PROFILES; DIODES AB High-energy Si implantations were performed into InP:Fe at energies ranging from 0.5 to 10 MeV for a dose of 3 x 10(14) cm-2, and at 3 MeV for the dose ranging from 1 x 10(14) to 2 x 10(15) cm-2. The first four statistical moments of the Si-depth distribution, namely range, longitudinal straggle, skewness, and kurtosis, were calculated from the secondary-ion mass spectrometry (SIMS) data of the as-implanted samples. These values were compared with the corresponding TRIM-89 calculated values. SIMS depth profiles were closely fitted by Pearson IV distributions. Multiple implantations in the energy range from 50 keV to 10 MeV were performed to obtain thick n-type layers. Variable temperature/time halogen lamp rapid thermal annealing (RTA) cycles and 735-degrees-C/10-min furnance annealing were used to activate the Si implants. No redistribution of Si was observed for the annealing cycles used in this study. Activations close to 100% were obtained for 3 x 10(14)-cm-2 Si implants in the energy range from 2 to 10 MeV for 875-degrees-C/10-s RTA. Transport equation calculations were used to interpret low activation results for high dose Si implants. Polaron electrochemical C-V profiling was used to obtain carrier concentration depth profiles. The lattice quality of the as-implanted and annealed material was evaluated by performing x-ray rocking curve measurements. C1 NATL INST STAND & TECHNOL,GAITHERSBURG,MD 20899. USN,RES LAB,WASHINGTON,DC 20375. RP NADELLA, RK (reprint author), GEORGE MASON UNIV,DEPT ELECT & COMP ENGN,FAIRFAX,VA 22030, USA. NR 25 TC 16 Z9 16 U1 0 U2 0 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0021-8979 J9 J APPL PHYS JI J. Appl. Phys. PD AUG 1 PY 1991 VL 70 IS 3 BP 1750 EP 1757 DI 10.1063/1.349515 PG 8 WC Physics, Applied SC Physics GA GA100 UT WOS:A1991GA10000095 ER PT J AU DOBISZ, EA MARRIAN, CRK COLTON, RJ AF DOBISZ, EA MARRIAN, CRK COLTON, RJ TI HIGH-RESOLUTION ELECTRON-BEAM LITHOGRAPHY WITH A POLYDIACETYLENE NEGATIVE RESIST AT 50 KV SO JOURNAL OF APPLIED PHYSICS LA English DT Article ID SCANNING TUNNELING MICROSCOPE AB A polydiacetylene with urethane substituents is shown to have high resolution, when used as a negative electron beam resist. The resist has a wide process latitude and can be developed in chloroform. The minimum feature size, distinguishable point-to-point spacing, linewidth, and line spacing are addressed through exposure test patterns of single pass line and pixel arrays. For a Gaussian probe with a 1/e radius of 8.3 nm, minimum feature sizes of 80 nm and minimum array period of 200 nm can be achieved in the resist. The resist exhibits line and isolated pixel sensitivities of almost-equal-to 4.2 nC/cm and 3.4 fC, respectively, at 50 kV, which are comparable to those of polymethylmethacrylate. The results are analyzed through electron scattering calculations and exposure chemistry. C1 USN,RES LAB,DIV CHEM,WASHINGTON,DC 20375. RP DOBISZ, EA (reprint author), USN,RES LAB,DIV ELECTR SCI & TECHNOL,CODE 6864,WASHINGTON,DC 20375, USA. NR 20 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 AUG 1 PY 1991 VL 70 IS 3 BP 1793 EP 1799 DI 10.1063/1.349494 PG 7 WC Physics, Applied SC Physics GA GA100 UT WOS:A1991GA10000100 ER PT J AU GUERRY, P ALM, RA POWER, ME LOGAN, SM TRUST, TJ AF GUERRY, P ALM, RA POWER, ME LOGAN, SM TRUST, TJ TI ROLE OF 2 FLAGELLIN GENES IN CAMPYLOBACTER MOTILITY SO JOURNAL OF BACTERIOLOGY LA English DT Article ID ESCHERICHIA-COLI; CAULOBACTER-CRESCENTUS; ANTIGENIC VARIATION; INTESTINAL COLONIZATION; SEQUENCE-ANALYSIS; CHEMOTAXIS GENES; JEJUNI INFECTION; RNA-POLYMERASE; SIGMA-FACTORS; EXPRESSION AB Campylobacter coli VC167 T2 has two flagellin genes, flaA and flaB, which share 91.9% sequence identity. The flaA gene is transcribed from a sigma-28 promoter, and the flaB gene from a sigma-54 promoter. Gene replacement mutagenesis techniques were used to generate flaA+ flaB and flaA flaB+ mutants. Both gene products are capable of assembling independently into functional filaments. A flagellar filament composed exclusively of the flaA gene product is indistinguishable in length from that of the wild type and shows a slight reduction in motility. The flagellar filament composed exclusively of the flaB gene product is severely truncated in length and greatly reduced in motility. Thus, while both flagellins are not necessary for motility, both products are required for a fully active flagellar filament. Although the wild-type flagellar filament is a heteropolymer of the flaA and flaB gene products, immunogold electron microscopy suggests that flaB epitopes are poorly surface exposed along the length of the wild-type filament. C1 UNIV VICTORIA,DEPT BIOCHEM & MICROBIOL,VICTORIA V8W 3P6,BC,CANADA. RP GUERRY, P (reprint author), USN,MED RES INST,ENTER DIS PROGRAM,12300 WASHINGTON AVE,ROCKVILLE,MD 20852, USA. NR 40 TC 141 Z9 144 U1 0 U2 6 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 AUG PY 1991 VL 173 IS 15 BP 4757 EP 4764 PG 8 WC Microbiology SC Microbiology GA FY774 UT WOS:A1991FY77400026 PM 1856171 ER PT J AU MRSTIK, BJ AF MRSTIK, BJ TI POSTIRRADIATION FORMATION OF SI-SIO2 INTERFACE STATES IN A HYDROGEN ATMOSPHERE AT ROOM-TEMPERATURE SO JOURNAL OF ELECTRONIC MATERIALS LA English DT Article DE SI-SIO2 INTERFACE STATES; SI MOSFET; IRRADIATION WITH X-RAYS ID MOS DEVICES; RADIATION; CHARGE; PASSIVATION; TRANSISTORS; GENERATION; DENSITY AB Si MOSFETs were irradiated with x-rays and then exposed to various partial pressures of H-2 at either room temperature or 125-degrees-C. The number of interface traps and the net positive oxide trapped charged were measured during the hydrogen exposure using spectroscopic charge pumping techniques. During the hydrogen exposure the gate electrode was held at a positive bias to maintain a field of 0.65 MV/cm across the gate oxide. It was found that during the room temperature hydrogen exposure the number of interface traps increased by a factor of about two. The change in the oxide trapped charge during hydrogen exposure indicated that the decrease in the number of positively charged oxide traps was approximately the same as the increase in the number of interface traps. The time evolution and bias dependence of these changes are explained by a model that we previously proposed. In this model positively charged radiation induced defects in the oxide crack the H-2 to form H+. Under positive gate bias the H+ then drifts to the Si-SiO2 interface where it forms an interface state, while at the same time removing positive charge from the oxide. RP USN, RES LAB, CODE 6816, WASHINGTON, DC 20375 USA. NR 14 TC 13 Z9 13 U1 0 U2 2 PU SPRINGER PI NEW YORK PA 233 SPRING ST, NEW YORK, NY 10013 USA SN 0361-5235 EI 1543-186X J9 J ELECTRON MATER JI J. Electron. Mater. PD AUG PY 1991 VL 20 IS 8 BP 627 EP 633 DI 10.1007/BF02669528 PG 7 WC Engineering, Electrical & Electronic; Materials Science, Multidisciplinary; Physics, Applied SC Engineering; Materials Science; Physics GA GA266 UT WOS:A1991GA26600008 ER PT J AU LUPER, WD EICHMILLER, FC DOBLECKI, W CAMPBELL, D LI, SH AF LUPER, WD EICHMILLER, FC DOBLECKI, W CAMPBELL, D LI, SH TI EFFECT OF 3 STERILIZATION TECHNIQUES ON FINGER PLUGGERS SO JOURNAL OF ENDODONTICS LA English DT Article ID ENDODONTIC INSTRUMENTS; CUTTING EFFICIENCY; FILES AB The effects of different sterilization methods on the fatigue life of finger pluggers were investigated. Ninety finger pluggers for each of four sizes (A, B, C, and D) were subdivided into subgroups of 10. Each subgroup was subjected to 1, 8, or 15 cycles of steam autoclave, dry heat, or bead sterilization. Ten control pluggers for each size were not sterilized. After sterilization, experimental and control finger pluggers were subjected to cyclic bending until fracture. Only the A finger pluggers autoclaved for eight cycles had a significantly lower number of cycles to failure compared with that of the controls. Nine subgroups had significantly greater number of cycles before failure than did the control. Because all but one sterilized group had fatigue lifetimes statistically equal to or greater than nonsterilized controls, clinicians generally can use any of the three sterilization methods without fear of plugger failure. C1 USN,DEPT ENDODONT,DENT CLIN,BREMERTON,WA. NATL INST STAND & TECHNOL,AMER DENT ASSOC HLTH FDN,GAITHERSBURG,MD. FMFPAC,1ST DENT BN,EL TORO,CA. USN,SCH DENT,DEPT ENDODONT,BETHESDA,MD 20814. NIDR,BIOMETRY SECT,BETHESDA,MD 20892. FU PHS HHS [M00095-06-3014] NR 11 TC 2 Z9 4 U1 0 U2 0 PU WILLIAMS & WILKINS PI BALTIMORE PA 351 WEST CAMDEN ST, BALTIMORE, MD 21201-2436 SN 0099-2399 J9 J ENDODONT JI J. Endod. PD AUG PY 1991 VL 17 IS 8 BP 361 EP 364 PG 4 WC Dentistry, Oral Surgery & Medicine SC Dentistry, Oral Surgery & Medicine GA FZ185 UT WOS:A1991FZ18500001 PM 1809797 ER PT J AU SCALES, WA BERNHARDT, PA AF SCALES, WA BERNHARDT, PA TI SIMULATION OF HIGH-SPEED (ORBITAL) RELEASES OF ELECTRON-ATTACHMENT MATERIALS IN THE IONOSPHERE SO JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS LA English DT Article ID PLASMA CLOUDS; ION CLOUDS; F-REGION; DEFORMATION; STRIATION; DYNAMICS; INSTABILITY; CHEMISTRY; MODEL; DRIFT AB The dynamics of ionospheric plasma irregularities produced by the release of electron attachment materials at orbital velocities across the geomagnetic field is studied. A two-dimensional electrostatic fluid model which includes electron attachment and mutual neutralization chemistry, self-consistent electric fields, and three-species transport is developed. Numerical simulations are performed to study the behavior at early and at late times after the release. At early times, of the order of or less than the attachment material neutral collision time, the negative ion cloud produced by the release may structure owing to the shear in the E x B velocity within the cloud. At high altitudes the cloud may bifurcate and form vortices on the back. At lower altitudes where ion-neutral collisional effects dominate, this structuring is suppressed. At late times, after a plasma depletion has formed due to neutralization chemistry, the cloud structures by the E x B interchange instability. Depending on the release altitude, the depletion structures by the collisional or inertial limit of this instability. RP SCALES, WA (reprint author), USN,RES LAB,DIV PLASMA PHYS,SPACE PLASMA BRANCH,WASHINGTON,DC 20375, USA. NR 23 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 JI J. Geophys. Res-Space Phys. PD AUG 1 PY 1991 VL 96 IS A8 BP 13815 EP 13828 DI 10.1029/91JA01084 PG 14 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA FZ834 UT WOS:A1991FZ83400007 ER PT J AU SHEELEY, NR SWANSON, ET WANG, YM AF SHEELEY, NR SWANSON, ET WANG, YM TI OUT-OF-ECLIPTIC TESTS OF THE INVERSE CORRELATION BETWEEN SOLAR-WIND SPEED AND CORONAL EXPANSION FACTOR SO JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS LA English DT Article ID INTERPLANETARY MAGNETIC-FIELD; HELIOSPHERIC CURRENT SHEET; CYCLE EVOLUTION; SCINTILLATION; STRENGTH; SUN AB In this paper we address the question of whether out-of-ecliptic measurements satisfy the inverse correlation between wind speed at 1 AU and flux tube divergence in the corona, already found from measurements in the ecliptic. Using the in-ecliptic calibration, we derive out-of-ecliptic speeds from coronal expansion factors determined from global observations of photospheric field and their current-free coronal extension. These derived speeds are compared with speeds inferred from interplanetary scintillation measurements during 1972-1988 and with in situ speeds measured by the Pioneer 11 spacecraft at 16-degrees-N latitude during 1984-1988. These three sets of wind speed show the same overall variation with latitude and time during the sunspot cycle, with higher latitudes having more years of fast wind than lower latitudes and all latitudes having slow wind at sunspot maximum. Although some detailed discrepancies are also present, the overall agreement is comparable to that achieved in the ecliptic plane. RP SHEELEY, NR (reprint author), USN,RES LAB,EO HULBURT CTR SPACE RES,CODE 4172,WASHINGTON,DC 20375, USA. NR 28 TC 17 Z9 17 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 AUG 1 PY 1991 VL 96 IS A8 BP 13861 EP 13868 DI 10.1029/91JA01168 PG 8 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA FZ834 UT WOS:A1991FZ83400011 ER PT J AU BERNHARDT, PA RODRIGUEZ, P SIEFRING, CL LIN, CS AF BERNHARDT, PA RODRIGUEZ, P SIEFRING, CL LIN, CS TI FIELD-ALIGNED DYNAMICS OF CHEMICALLY-INDUCED PERTURBATIONS TO THE IONOSPHERE SO JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS LA English DT Article ID F-REGION; PARTICLE-PRECIPITATION; DEPLETION EXPERIMENTS; ELECTRIC-FIELD; BARIUM CLOUDS; AURORAL ARC; PLASMA; EMISSIONS; SPACE; NONUNIFORM AB Ionospheric modification using photochemically reactive vapors is studied with a one-dimensional, multi-ion, fluid model of plasma flow along magnetic field lines. The magnitudes of ion and electron density changes are determined by considering both chemical processes (i.e., photoionization, ion-molecule reactions, dissociative recombination, electron attachment) and transport processes (i.e., multispecies diffusion, electric currents, ambipolar electric fields). The numerical treatment in the model is not specific to any type of release or any interaction chemistry. It has been used to simulate releases of Ba, CO2, and CF3Br in the ionosphere, but generalization to other species may be easily accomplished. The results of the calculations are found to be in good agreement with experimental observations. The feasibility of modifying the parallel current paths in the auroral F region is examined. C1 USN,RES LAB,CTR ADV SPACE SENSING,IMAGING SYST & RES BRANCH,WASHINGTON,DC 20375. RP BERNHARDT, PA (reprint author), USN,RES LAB,DIV PLASMA PHYS,SPACE PLASMA BRANCH,WASHINGTON,DC 20375, USA. NR 48 TC 27 Z9 27 U1 2 U2 3 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 AUG 1 PY 1991 VL 96 IS A8 BP 13887 EP 13900 DI 10.1029/91JA01424 PG 14 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA FZ834 UT WOS:A1991FZ83400014 ER PT J AU BURKHART, GR CHEN, J AF BURKHART, GR CHEN, J TI DIFFERENTIAL MEMORY IN THE EARTHS MAGNETOTAIL SO JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS LA English DT Article ID MAXWELLIAN NEUTRAL-SHEET; PARTICLE DYNAMICS; GEOMAGNETIC TAIL; TEARING INSTABILITY; PLASMA SHEET; BOUNDARY-LAYER; COLLISIONLESS; ACCELERATION; RECONNECTION; CONDUCTIVITY AB The process of differential memory is quantitatively studied in the modified Harris magnetotail geometry. This process arises as a consequence of nonlinear particle dynamics in the magnetotail which gives rise to partitioning of phase space into disjoint regions. Different regions are occupied by distinct classes of orbits and have widely separated time scales. This paper gives the first study of the time scales and potentially observable signatures in plasma distribution functions associated with the process of differential memory. It is found that the effective "trapping" time of stochastic orbits plays a critical role in differential memory and that in the magnetotail geometry, this time has resonances at certain values of the parameter H tripple-overdot. A scaling law H tripple-overdot 1/4 has been found for this previously unknown resonance effect. This scaling is directly related to the phase space structures of this stochastic system and leads to signatures in the distribution functions, and their velocity moments (density, velocity components, and kinetic temperatures) are computed following a prescribed change in the boundary conditions. The relationships between the initial changes and the time-asymptotic distribution functions are discussed. The results depend only on the large-scale phase space structures and not on individual chaotic orbits. C1 USN,RES LAB,DIV PLASMA PHYS,SPACE PLASMA BRANCH,WASHINGTON,DC 20375. NR 47 TC 91 Z9 92 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 AUG 1 PY 1991 VL 96 IS A8 BP 14033 EP 14049 DI 10.1029/91JA01137 PG 17 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA FZ834 UT WOS:A1991FZ83400027 ER PT J AU ASKINS, CG PUTNAM, MA FRIEBELE, EJ AF ASKINS, CG PUTNAM, MA FRIEBELE, EJ TI NONCONTACT MEASUREMENT OF OPTICAL FIBER DRAW TENSION SO JOURNAL OF LIGHTWAVE TECHNOLOGY LA English DT Article ID SINGLE-MODE FIBERS; CONDITION DEPENDENCE; STRESS AB A simple technique for measuring the tension on an optical fiber during the draw process without contacting the fiber surface is reported. The tension, determined from the fundamental resonant frequency of the length of fiber between the neckdown region in the furnance and the coating cup is accurate to within 1% and repeatable to < 0.0005 kg. C1 UNIV MARYLAND,RES FDN,COLLEGE PK,MD 20770. RP ASKINS, CG (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 17 TC 2 Z9 2 U1 0 U2 0 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0733-8724 J9 J LIGHTWAVE TECHNOL JI J. Lightwave Technol. PD AUG PY 1991 VL 9 IS 8 BP 945 EP 947 DI 10.1109/50.84157 PG 3 WC Engineering, Electrical & Electronic; Optics; Telecommunications SC Engineering; Optics; Telecommunications GA FY177 UT WOS:A1991FY17700001 ER PT J AU GOODMAN, IR NGUYEN, HT ROGERS, GS AF GOODMAN, IR NGUYEN, HT ROGERS, GS TI ON THE SCORING APPROACH TO ADMISSIBILITY OF UNCERTAINTY MEASURES IN EXPERT SYSTEMS SO JOURNAL OF MATHEMATICAL ANALYSIS AND APPLICATIONS LA English DT Article ID DISTRIBUTIONS; MARGINALS; COHERENCE; FAMILIES; COPULAS; LOGIC C1 NEW MEXICO STATE UNIV,DEPT MATH SCI,LAS CRUCES,NM 88003. RP GOODMAN, IR (reprint author), USN,CTR OCEAN SYST,SAN DIEGO,CA 92152, USA. NR 35 TC 9 Z9 9 U1 0 U2 1 PU ACADEMIC PRESS INC JNL-COMP SUBSCRIPTIONS PI SAN DIEGO PA 525 B ST, STE 1900, SAN DIEGO, CA 92101-4495 SN 0022-247X J9 J MATH ANAL APPL JI J. Math. Anal. Appl. PD AUG PY 1991 VL 159 IS 2 BP 550 EP 594 DI 10.1016/0022-247X(91)90214-K PG 45 WC Mathematics, Applied; Mathematics SC Mathematics GA GC660 UT WOS:A1991GC66000018 ER PT J AU IORIO, MA TOMASSINI, L MATTSON, MV GEORGE, C JACOBSON, AE AF IORIO, MA TOMASSINI, L MATTSON, MV GEORGE, C JACOBSON, AE TI SYNTHESIS, STEREOCHEMISTRY, AND BIOLOGICAL-ACTIVITY OF THE 1-(1-PHENYL-2-METHYLCYCLOHEXYL)PIPERIDINES AND THE 1-(1-PHENYL-4-METHYLCYCLOHEXYL)PIPERIDINES - ABSOLUTE-CONFIGURATION OF THE POTENT TRANS-(-)-1-(1-PHENYL-2-METHYLCYCLOHEXYL)PIPERIDINE SO JOURNAL OF MEDICINAL CHEMISTRY LA English DT Article ID D-ASPARTATE RECEPTOR; PHENCYCLIDINE DERIVATIVES; ANTICONVULSANT MK-801; RAT-BRAIN; BINDING; CHANNEL; PCP; ANALOGS; INVIVO AB The (-)- and (+)-isomers of the cis- and trans-Ph/Me 1-(1-phenyl-2-methylcyclohexyl)piperidines have been synthesized and the achiral cis- and trans-Ph/Me 1-(1-phenyl-4-methylcyclohexyl)piperidines were prepared, and their in vitro [displacement of [H-3]TCP (1-(2-thienylcyclohexyl)]piperidine) from the PCP (1-(1-phenylcyclohexyl)piperidine) binding site] and in vivo (rotarod assay) activities determined. The 1-(1-phenyl-2-methylcyclohexyl)piperidine isomers were resolved by classical crystallization procedures, through the diastereomeric salts obtained with d- and l-10-camphorsulfonic acid. The relative stereochemistry of the cis- and trans-Ph/Me 1-(1-phenyl-2-methylcyclohexyl)piperidines and the achiral cis- and trans-Ph/Me 1-(1-phenyl-4-methylcyclohexyl)piperidines was established by using C-13 and H-1 NMR. Both (-)-trans-1-(1-phenyl-2-methylcyclohexyl)piperidine ((-)-2) and (+)-trans-1-(1-phenyl-2-methylcyclohexyl)piperidine ((+)-2) were examined by single-crystal X-ray analysis, and the absolute configuration of (-)-2 was determined to be 1S,2R. The (-)-2 was found to be about five times more potent than PCP in vitro and twice as potent in vivo. It is the most potent of all of the simple methyl-substituted cyclohexyl PCP isomers and is among the most potent PCP-like compounds which have been synthesized. It was nine times more potent in vitro and four times more potent in vivo than (+)-2. The racemic cis-1-(1-phenyl-2-methylcyclohexyl)piperidine (3), and its enantiomers ((+)-3 and (-)-3), were essentially inactive in vitro and in vivo. The cis-Ph/Me 1-(1-phenyl-4-methylcyclohexyl)piperidine (18) was more potent than trans-Ph/Me 1-(1-phenyl-4-methylcyclohexyl)piperidine (17), but considerably less potent than (-)-2. The enantioselectivity observed at the PCP binding site for (-)-2 could indicate that this site can discriminate between enantiotopic edges of the achiral PCP (choosing the pro-1-S edge), as does the mu-opioid receptor in the prodine series of opioids. Benzimidoyl or benzoyl group replacement of the phenyl ring in the 1-(1-phenyl-2-methylcyclohexyl)piperidine series gave compounds which showed little in vitro and in vivo activity. C1 NIDDKD,MED CHEM LAB,BETHESDA,MD 20892. IST SUPER SANITA,PHARMACEUT CHEM LAB,I-00161 ROME,ITALY. USN,RES LAB,WASHINGTON,DC 20375. NR 33 TC 13 Z9 13 U1 0 U2 1 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0022-2623 J9 J MED CHEM JI J. Med. Chem. PD AUG PY 1991 VL 34 IS 8 BP 2615 EP 2623 DI 10.1021/jm00112a041 PG 9 WC Chemistry, Medicinal SC Pharmacology & Pharmacy GA GB158 UT WOS:A1991GB15800041 PM 1875352 ER PT J AU BARCO, CT AF BARCO, CT TI PREVENTION OF INFECTIVE ENDOCARDITIS - A REVIEW OF THE MEDICAL AND DENTAL LITERATURE SO JOURNAL OF PERIODONTOLOGY LA English DT Review DE ENDOCARDITIS, INFECTIVE ETIOLOGY; ENDOCARDITIS, INFECTIVE PREVENTION; PERIODONTAL POCKETS MICROBIOLOGY ID EXPERIMENTAL STREPTOCOCCAL ENDOCARDITIS; CARDIOBACTERIUM-HOMINIS ENDOCARDITIS; EXPERIMENTAL BACTERIAL-ENDOCARDITIS; EIKENELLA-CORRODENS ENDOCARDITIS; GRAM-NEGATIVE BACTERIA; ORAL IRRIGATION DEVICE; HEMOPHILUS APHROPHILUS ENDOCARDITIS; OCCULT POLYMICROBIAL ENDOCARDITIS; NEISSERIA-SUBFLAVA ENDOCARDITIS; PROSTHETIC VALVE ENDOCARDITIS AB THIS PAPER IS A REVIEW of what is presently known about the cause and prevention of infective endocarditis. Systemic antibiotics alone are not always enough for an effective prevention of infective endocarditis. Non-streptococcus bacteria frequently found in the periodontal pocket are now reported as causing infective endocarditis; these bacteria are not uniformly susceptible to the antibiotics recommended for prophylaxis. Animal studies indicate that periodontal disease does increase the incidence of infective endocarditis and that the number of microbes entering the blood stream may not be as important in the production of infective endocarditis as other qualities, such as the microbe's ability to adhere. Antibiotics may affect the ability of a microorganism to adhere to tissues of the heart, but this association is yet unclear and may vary with the antibiotic and species of bacteria. Reduction of inflammation of the periodontal tissues is of the utmost importance in the prevention of infective endocarditis; however, mouthrinses have a very limited effect in a periodontal pocket of more than 3 mm in depth and irrigation of a periodontal pocket may create a dangerous bacteremia. Nevertheless, in addition to systemic antibiotics, local antimicrobial agents followed by routine dental treatment and maintenance show promise as an effective means for the prevention of infective endocarditis. Future research in the prevention of infective endocarditis should include placement of antimicrobials in the periodontal pocket and systemic agents that reduce platelet adhesion. The suggestions presented in this review are only recommendations for further research and are not to be construed as a substitute for the current guidelines. C1 USN,CTR DENT,DEPT PERIODONT,HONOLULU,HI. NR 244 TC 35 Z9 36 U1 1 U2 2 PU AMER ACAD PERIODONTOLOGY PI CHICAGO PA 737 NORTH MICHIGAN AVENUE, SUITE 800, CHICAGO, IL 60611-2690 SN 0022-3492 J9 J PERIODONTOL JI J. Periodont. PD AUG PY 1991 VL 62 IS 8 BP 510 EP 523 PG 14 WC Dentistry, Oral Surgery & Medicine SC Dentistry, Oral Surgery & Medicine GA GB221 UT WOS:A1991GB22100007 PM 1920019 ER PT J AU SHIN, YS IVERSON, JC KIM, KS AF SHIN, YS IVERSON, JC KIM, KS TI EXPERIMENTAL STUDIES ON DAMPING CHARACTERISTICS OF BOLTED JOINTS FOR PLATES AND SHELLS SO JOURNAL OF PRESSURE VESSEL TECHNOLOGY-TRANSACTIONS OF THE ASME LA English DT Article ID VIBRATION AB Reducing the contact force in bolted structural connections can reduce system vibration amplitudes by enhancing joint damping capacity. A test model consisting of two concentric circular cylindrical shells and four vanes connected by groups of bolts was tested and analyzed to investigate the relationship between the bolt preload and the system damping. A viscoelastic material was then introduced between the contacting surfaces at bolted joints and its effect on system damping was again investigated. C1 USN,POSTGRAD SCH,DEPT MECH ENGN,MONTEREY,CA 93940. NR 7 TC 22 Z9 22 U1 0 U2 0 PU ASME-AMER SOC MECHANICAL ENG PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 SN 0094-9930 J9 J PRESS VESS-T ASME JI J. Press. Vessel Technol.-Trans. ASME PD AUG PY 1991 VL 113 IS 3 BP 402 EP 408 DI 10.1115/1.2928774 PG 7 WC Engineering, Mechanical SC Engineering GA HP755 UT WOS:A1991HP75500009 ER PT J AU DWYER, RF AF DWYER, RF TI 4TH-ORDER SPECTRA OF GAUSSIAN AMPLITUDE-MODULATED SINUSOIDS SO JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA LA English DT Article AB Propagating underwater signals are sometimes amplitude modulated by the medium or other physical effects. Since this is a multiplicative phenomenon, the resulting spectrum is a convolution of the spectra of the modulation and the desired signal. A new method based on the spectrum of a special case of the fourth-order cumulant is proposed to extract the desired signal. It is shown that the special case of the fourth-order cumulant is independent of the covariance of a Gaussian modulating function, and therefore it can extract the desired signal even when the modulating process is Gaussian white noise. Convergence equations are derived which show that the fourth-order cumulant and its special case will converge to their asymptotic forms as the data length increases. The spectrum of the special case of the fourth-order cumulant is also derived at the output of a low-pass filter. To demonstrate these theoretical results, an experiment was conducted. A sinusoid was modulated by white Gaussian noise and transmitted through the water and received on an omnidirectional hydrophone. The second-order spectrum, the spectrum of the special case of the fourth-order moment and the spectrum of the special case of the fourth-order cumulant were estimated from the filtered data. The experiment corroborated the theoretical results by showing that the second-order spectrum could not extract the sinusoidal frequency, but the spectrum of the special case of the fourth-order moment and the spectrum of the special case of the fourth-order cumulant could. Simulations are included which further corroborate the theoretical results. RP DWYER, RF (reprint author), USN,CTR UNDERWATER SYST,NEW LONDON,CT 06320, USA. NR 19 TC 33 Z9 36 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 AUG PY 1991 VL 90 IS 2 BP 918 EP 926 DI 10.1121/1.401958 PN 1 PG 9 WC Acoustics; Audiology & Speech-Language Pathology SC Acoustics; Audiology & Speech-Language Pathology GA FZ779 UT WOS:A1991FZ77900023 ER PT J AU MOFFETT, MB POWERS, JM CLARK, AE AF MOFFETT, MB POWERS, JM CLARK, AE TI COMPARISON OF TERFENOL-D AND PZT-4 POWER LIMITATIONS SO JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA LA English DT Letter AB A previous article [Moffett et al., J. Acoust. Soc. Am. 89, 1448-1455 (1991)], comparing the radiated-power limitations of Terfenol-D and PZT-4, is revisited. When the power at resonance is stress-limited (as is the case for high mechanical quality factor Q), the maximum allowable stress amplitude T(max) is the compressive prestress value, so that tension in the Terfenol-D is avoided. When this value is chosen for T(max), rather than the smaller T(max)'s of the previous article, Terfenol-D is shown to be superior to PZT-4 in power capability at all values of the quality factor Q. C1 USN,CTR SURFACE WARFARE,SILVER SPRING,MD 20910. RP MOFFETT, MB (reprint author), USN,CTR UNDERWATER SYST,NEW LONDON,CT 06320, USA. NR 6 TC 14 Z9 14 U1 1 U2 2 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0001-4966 J9 J ACOUST SOC AM JI J. Acoust. Soc. Am. PD AUG PY 1991 VL 90 IS 2 BP 1184 EP 1185 DI 10.1121/1.402024 PN 1 PG 2 WC Acoustics; Audiology & Speech-Language Pathology SC Acoustics; Audiology & Speech-Language Pathology GA FZ779 UT WOS:A1991FZ77900057 ER PT J AU PHOTIADIS, DM AF PHOTIADIS, DM TI THE EFFECT OF WALL ELASTICITY ON THE PROPERTIES OF A HELMHOLTZ RESONATOR SO JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA LA English DT Article AB The effect of compliant walls on the properties of a Helmholtz resonator is examined. The effective stiffness of the resonator is decreased by the wall compliance, while the effective mass is unchanged to leading order. The radiation resistance is also decreased due to a cancellation between the radiation from the cavity opening and the radiation from the cavity walls. This leads to a reduction in the cross section at resonance by the factor [Z(s)/(Z(s) + Z(f)0)]4, where Z(s) is the wall impedance and Z(f)0 is the total fluid loading on the breathing mode of the cavity. RP PHOTIADIS, DM (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 7 TC 6 Z9 7 U1 0 U2 4 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0001-4966 J9 J ACOUST SOC AM JI J. Acoust. Soc. Am. PD AUG PY 1991 VL 90 IS 2 BP 1188 EP 1190 DI 10.1121/1.402026 PN 1 PG 3 WC Acoustics; Audiology & Speech-Language Pathology SC Acoustics; Audiology & Speech-Language Pathology GA FZ779 UT WOS:A1991FZ77900059 ER PT J AU GOLDMAN, L AF GOLDMAN, L TI CONCURRENT EPIDERMAL CHANGES AFTER LASER IMPACTS SO JOURNAL OF THE AMERICAN ACADEMY OF DERMATOLOGY LA English DT Letter RP GOLDMAN, L (reprint author), USN HOSP,SAN DIEGO,CA 92134, USA. NR 5 TC 0 Z9 0 U1 0 U2 0 PU MOSBY-YEAR BOOK INC PI ST LOUIS PA 11830 WESTLINE INDUSTRIAL DR, ST LOUIS, MO 63146-3318 SN 0190-9622 J9 J AM ACAD DERMATOL JI J. Am. Acad. Dermatol. PD AUG PY 1991 VL 25 IS 2 BP 343 EP 343 DI 10.1016/S0190-9622(08)80488-4 PN 1 PG 1 WC Dermatology SC Dermatology GA FY771 UT WOS:A1991FY77100033 PM 1918484 ER PT J AU KILROY, WP AF KILROY, WP TI THE EFFECT OF HIGH-TEMPERATURE ON THE DISCHARGE CHEMISTRY OF LI/SO2 CELLS SO JOURNAL OF THE ELECTROCHEMICAL SOCIETY LA English DT Article ID THIOSULFATE; DITHIONITE; HAZARDS; SULFITE AB The composition of products obtained from discharging Li-SO2 cells at low current density (1 mA/cm2) at high temperatures (71-degrees-C) has been determined. Accelerating rate calorimetry studies on Li2S2O4 indicate the discharge products are attributed to a partial thermal decomposition of the Li2S2O4 originally produced in the cell. RP KILROY, WP (reprint author), USN,CTR SURFACE WARFARE,SILVER SPRING,MD 20903, USA. NR 16 TC 1 Z9 1 U1 0 U2 1 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 AUG PY 1991 VL 138 IS 8 BP 2220 EP 2223 DI 10.1149/1.2085953 PG 4 WC Electrochemistry; Materials Science, Coatings & Films SC Electrochemistry; Materials Science GA FZ323 UT WOS:A1991FZ32300011 ER PT J AU MERMELSTEIN, MD PRIEST, RG AF MERMELSTEIN, MD PRIEST, RG TI DYNAMIC SPECKLE SPATIAL COHERENCE MEASUREMENTS UTILIZING A SINGLE-MODE OPTICAL-FIBER PROBE SO JOURNAL OF THE OPTICAL SOCIETY OF AMERICA A-OPTICS IMAGE SCIENCE AND VISION LA English DT Article ID LIGHT-SCATTERING AB The spatial coherence functions for light scattered by a suspension of particles undergoing Brownian motion are interrogated with a single-mode optical-fiber interferometer. The exposed core of a single-mode optical fiber is utilized as a mobile pointlike probe of the scattered optical field. Two such fiber probes, together with a three-coupler heterodyne interferometer, are used to measure the spatial coherence of fluctuations in the scattered light intensity, the heterodyne carrier amplitude, the intensity-weighted phase rate (IWPR), and the phase rate. Spatial coherence measurements for coherent particle motion are also presented for the IWPR and the phase rate. A theoretical analysis of the spatial coherence functions is developed and compared with the experimental results. The coherence function for fluctuations in the intensity and the IWPR that is due to Brownian particle motion exhibits a Gaussian functional form with a coherence lengths xi-c of approximately 2 +/- 1.2-mu-m at 1.0 kHz. This result is in good agreement with the theoretical result of 1.5 +/- 0.9-mu-m based on the scattering volume dimensions and scatterings geometry. Measurements of the phase-rate spatial coherence function for Brownian motion were inaccessible because of signal-to-noise-ratio limitations associated with the signal-processing electronics. The IWPR measurements for coherent particle motion exhibit a bandwidth-dependent coherence function, having a background level of 0.74 and a coherence length xi-c of 4.5-mu-m at 1.8 kHz. The phase-rate coherence function for coherent particle motion was constant with a value of 0.5. RP MERMELSTEIN, MD (reprint author), USN,RES LAB,DIV OPT SCI,WASHINGTON,DC 20375, USA. NR 5 TC 2 Z9 2 U1 1 U2 1 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 AUG PY 1991 VL 8 IS 8 BP 1306 EP 1315 DI 10.1364/JOSAA.8.001306 PG 10 WC Optics SC Optics GA FY419 UT WOS:A1991FY41900013 ER PT J AU HANSON, F DICK, D VERDUN, HR KOKTA, M AF HANSON, F DICK, D VERDUN, HR KOKTA, M TI OPTICAL-PROPERTIES AND LASING OF ND-SRGDGA3O7 SO JOURNAL OF THE OPTICAL SOCIETY OF AMERICA B-OPTICAL PHYSICS LA English DT Article ID LASER; ABSORPTION; NEODYMIUM AB Absorption and emission cross sections for the 4I9/2 <--> 4F3/2 transition in Nd:SrGdGa3O, have been measured as a function of temperature. A fluorescence branching ratio of 0.42 for this transition was calculated from a Judd-Ofelt analysis. Diode-pumped lasing was demonstrated at 0.911-mu-m at reduced temperature and 1.06-mu-m at room temperature. An optical slope efficiency of 9% was achieved at 1.06-mu-m with diode side pumping. C1 FIBERTEK CORP,HERNDON,VA 22070. UNION CARBIDE CORP,WASHOUGAL,WA 98671. RP HANSON, F (reprint author), USN,CTR OCEAN SYST,SAN DIEGO,CA 92152, USA. NR 14 TC 41 Z9 41 U1 0 U2 7 PU OPTICAL SOC AMER PI WASHINGTON PA 2010 MASSACHUSETTS AVE NW, WASHINGTON, DC 20036 SN 0740-3224 J9 J OPT SOC AM B JI J. Opt. Soc. Am. B-Opt. Phys. PD AUG PY 1991 VL 8 IS 8 BP 1668 EP 1673 DI 10.1364/JOSAB.8.001668 PG 6 WC Optics SC Optics GA GA281 UT WOS:A1991GA28100017 ER PT J AU CRAIG, TJ AF CRAIG, TJ TI PSITTACOSIS - A CASE-REPORT AND REVIEW OF THE LITERATURE SO JOURNAL OF WILDERNESS MEDICINE LA English DT Review DE PSITTACOSIS; PNEUMONIA; AVIAN EXPOSURE AB Psittacosis should be considered in any patient with fever of undetermined origin. The only clues to diagnosis may be failure to respond to antibiotics or history of bird exposure. Birds may be asymptomatic and able to transmit disease, thus quarantine and treatment of imported birds does not guarantee freedom from disease. An ELISA test limited to avian feces may be inadequate; cultures increase sensitivity. In most cases, diagnosis is not confirmed for 4-6 weeks. In order to prevent significant complications, therapy should be started on suspicion. Rapid response to tetracycline should be expected. The case of psittacosis presented emphasizes multiple salient features of the disease. History of animal exposure, including avian, should be a part of every history and physical examination. RP CRAIG, TJ (reprint author), USN,HOSP,DEPT INTERNAL MED,SAN DIEGO,CA 92132, USA. NR 0 TC 1 Z9 1 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 AUG PY 1991 VL 2 IS 3 BP 206 EP 218 DI 10.1580/0953-9859-2.3.206 PG 13 WC Medicine, General & Internal; Physiology SC General & Internal Medicine; Physiology GA GA631 UT WOS:A1991GA63100009 ER PT J AU REYNOLDS, WT AARONSON, HI SPANOS, G AF REYNOLDS, WT AARONSON, HI SPANOS, G TI A SUMMARY OF THE PRESENT DIFFUSIONIST VIEWS ON BAINITE SO MATERIALS TRANSACTIONS JIM LA English DT Article DE BAINITE; BAINITE MORPHOLOGY; DIFFUSIONAL TRANSFORMATION; SHEAR TRANSFORMATION; AUSTENITE; FERRITE; PEARLITE; CEMENTITE; CARBON STEEL; ALLOY STEEL ID PERCENT CR ALLOY; BOUNDARY FERRITE ALLOTRIOMORPHS; AUSTENITE GROWTH INTERFACE; BETA-VANADIUM HYDRIDE; INVARIANT LINE; PRECIPITATION; KINETICS; CRYSTALLOGRAPHY; TRANSFORMATION; MORPHOLOGY AB The bainite transformation is here considered to be a nonlamellar, competitive form of eutectoid decomposition reaction, taking place by means of ledgewise diffusional growth. The differences between this diffusional, microstructurally oriented approach and a definition evolved from a shear-based transformation mechanism are summarized. The various morphologies of microstructurally defined bainite are described, and the factors affecting their growth kinetics are reviewed. Finally, explanations for the peculiarities associated with the transformation at intermediate reaction temperatures in certain alloy steels are presented. C1 USN,RES LAB,PHYS MET BRANCH,WASHINGTON,DC 20375. CARNEGIE MELLON UNIV,DEPT MET ENGN & MAT SCI,PITTSBURGH,PA 15213. RP REYNOLDS, WT (reprint author), VIRGINIA POLYTECH INST & STATE UNIV,DEPT MAT ENGN,BLACKSBURG,VA 24061, USA. NR 99 TC 26 Z9 27 U1 1 U2 5 PU JAPAN INST METALS PI SENDAI PA AOBA ARAMAKI, SENDAI 980, JAPAN SN 0916-1821 J9 MATER T JIM JI Mater. Trans. JIM PD AUG PY 1991 VL 32 IS 8 BP 737 EP 746 PG 10 WC Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Materials Science; Metallurgy & Metallurgical Engineering GA GF737 UT WOS:A1991GF73700012 ER PT J AU QUINT, T AF QUINT, T TI NECESSARY AND SUFFICIENT CONDITIONS FOR BALANCEDNESS IN PARTITIONING GAMES SO MATHEMATICAL SOCIAL SCIENCES LA English DT Article DE ASSIGNMENT GAME; PARTITIONING GAME; NONEMPTY CORE; LINEAR PROGRAMMING AB This paper considers the class of partitioning games, which includes the bridge game, the assignment game, the consecutive game, and the m-sided assignment game, which is itself a generalization of the assignment game. We provide necessary and sufficient conditions for existence of the core in these games. RP QUINT, T (reprint author), USN ACAD,DEPT MATH,ANNAPOLIS,MD 21402, USA. NR 8 TC 8 Z9 8 U1 0 U2 3 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0165-4896 J9 MATH SOC SCI JI Math. Soc. Sci. PD AUG PY 1991 VL 22 IS 1 BP 87 EP 91 DI 10.1016/0165-4896(91)90068-3 PG 5 WC Economics; Mathematics, Interdisciplinary Applications; Social Sciences, Mathematical Methods SC Business & Economics; Mathematics; Mathematical Methods In Social Sciences GA GR730 UT WOS:A1991GR73000005 ER PT J AU PAZZAGLIA, G PODGORE, J MERCADO, W MARTINEZ, A URTEAGA, A ECHEVARRY, E AF PAZZAGLIA, G PODGORE, J MERCADO, W MARTINEZ, A URTEAGA, A ECHEVARRY, E TI THE ETIOLOGY OF CHILDHOOD DIARRHEA IN NORTHERN COASTAL PERU - THE 1989 FUERZAS UNIDAS HUMANITARIAN CIVIC ACTION - A MODEL FOR INTERNATIONAL AND INTERSERVICE COOPERATION, COMMUNITY-SERVICE, AND SCIENTIFIC OPPORTUNITY SO MILITARY MEDICINE LA English DT Article AB As a humanitarian civic action project, American and Peruvian military medical personnel established a temporary clinic in Dos Palos, Peru. Fecal specimens from 20 diarrheic children and 10 non-diarrheic controls were tested for common agents of diarrhea. Enteropathogens detected in diarrheic stools were enterotoxigenic Escherichia coli (ETEC; 30%), Aeromonas (20%), enteropathogenic E. coli (15%), and Campylobacter (15%). Isolates from control specimens were Aeromonas (10%) and Campylobacter (10%). ETEC-associated diarrhea was more common in this study (30%) than in three similar populations studied in Lima (2-16%). The results suggest that the northern coastal area of Peru is a relatively high-risk area for diarrhea caused by ETEC. RP PAZZAGLIA, G (reprint author), USN,MED RES INST DETACHMENT,APO,MIAMI,FL 34031, USA. NR 0 TC 1 Z9 3 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 AUG PY 1991 VL 156 IS 8 BP 402 EP 405 PG 4 WC Medicine, General & Internal SC General & Internal Medicine GA GB576 UT WOS:A1991GB57600012 PM 1956529 ER PT J AU HOGAN, TF ROSMOND, TE AF HOGAN, TF ROSMOND, TE TI THE DESCRIPTION OF THE NAVY OPERATIONAL GLOBAL ATMOSPHERIC PREDICTION SYSTEMS SPECTRAL FORECAST MODEL SO MONTHLY WEATHER REVIEW LA English DT Article ID LARGE-SCALE ENVIRONMENT; CUMULUS CLOUD ENSEMBLE; GENERAL-CIRCULATION; RADIATION; VERIFICATION; CLIMATE; SCHEME; CYCLE AB We present a description of the development of the spectral forecast components of the Navy Operational Global Atmospheric Prediction System (NOGAPS). The original system, called 3.0, was introduced in January 1988. New versions were introduced in March 1989 (3.1) and August 1989 (3.2). A brief description of each version of the forecast model is given. Each physical parameterization is also described. We discuss the large changes in 3.1 and the motivation behind the changes. Statistical results from forecast comparison tests are discussed. Figures showing the total monthly forecast performance in the Northern Hemisphere and the Southern Hemisphere are also given. A brief discussion is presented of computational details, running times, and memory requirements of the forecast model. C1 USN, OCEANOG & ATMOSPHER RES LAB, ATMOSPHER DIRECTORATE, MONTEREY, CA 93943 USA. NR 61 TC 327 Z9 328 U1 0 U2 3 PU AMER METEOROLOGICAL SOC PI BOSTON PA 45 BEACON ST, BOSTON, MA 02108-3693 USA SN 0027-0644 J9 MON WEATHER REV JI Mon. Weather Rev. PD AUG PY 1991 VL 119 IS 8 BP 1786 EP 1815 DI 10.1175/1520-0493(1991)119<1786:TDOTNO>2.0.CO;2 PG 30 WC Meteorology & Atmospheric Sciences SC Meteorology & Atmospheric Sciences GA GB419 UT WOS:A1991GB41900002 ER PT J AU ROSENTHAL, RE AF ROSENTHAL, RE TI SPECIAL ISSUE ON SEARCH THEORY - EDITORIAL SO NAVAL RESEARCH LOGISTICS LA English DT Editorial Material RP ROSENTHAL, RE (reprint author), USN,POSTGRAD SCH,WASHINGTON,DC 20350, USA. NR 0 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 0894-069X J9 NAV RES LOG JI Nav. Res. Logist. PD AUG PY 1991 VL 38 IS 4 BP 463 EP 463 DI 10.1002/1520-6750(199108)38:4<463::AID-NAV3220380402>3.0.CO;2-Q PG 1 WC Operations Research & Management Science SC Operations Research & Management Science GA FY787 UT WOS:A1991FY78700001 ER PT J AU STONE, LD WASHBURN, AR AF STONE, LD WASHBURN, AR TI SPECIAL ISSUE ON SEARCH THEORY - INTRODUCTION SO NAVAL RESEARCH LOGISTICS LA English DT Editorial Material ID MOVING TARGET; PATH C1 USN,POSTGRAD SCH,WASHINGTON,DC 20350. NR 17 TC 3 Z9 3 U1 1 U2 1 PU JOHN WILEY & SONS INC PI NEW YORK PA 605 THIRD AVE, NEW YORK, NY 10158-0012 SN 0894-069X J9 NAV RES LOG JI Nav. Res. Logist. PD AUG PY 1991 VL 38 IS 4 BP 465 EP 468 DI 10.1002/1520-6750(199108)38:4<465::AID-NAV3220380403>3.0.CO;2-L PG 4 WC Operations Research & Management Science SC Operations Research & Management Science GA FY787 UT WOS:A1991FY78700002 ER PT J AU EAGLE, JN WASHBURN, AR AF EAGLE, JN WASHBURN, AR TI CUMULATIVE SEARCH EVASION GAMES SO NAVAL RESEARCH LOGISTICS LA English DT Article ID TARGET; PATH AB Cumulative search-evasion games (CSEGs) are two-person zero-sum search-evasion games where play proceeds throughout some specified period without interim feedback to either of the two players. Each player moves according to a preselected plan. If (X(t), Y(t)) are the positions of the two players at time t, then the game's payoff is the sum over t from 1 to T of A(X(t), Y(t), t). Additionally, all paths must be "connected." That is, the finite set of positions available for a player in any time period depends on the position selected by that player in the previous time period. One player attempts to select a mixed strategy over the feasible T-time period paths to maximize the expected payoff. The other minimizes. Two solution procedures are given. One uses the Brown-Robinson method of fictitious play and the other linear programming. An example problem is solved using both procedures. RP EAGLE, JN (reprint author), USN,POSTGRAD SCH,DEPT OPERAT RES,MONTEREY,CA 93943, USA. NR 14 TC 13 Z9 13 U1 0 U2 0 PU JOHN WILEY & SONS INC PI NEW YORK PA 605 THIRD AVE, NEW YORK, NY 10158-0012 SN 0894-069X J9 NAV RES LOG JI Nav. Res. Logist. PD AUG PY 1991 VL 38 IS 4 BP 495 EP 510 DI 10.1002/1520-6750(199108)38:4<495::AID-NAV3220380405>3.0.CO;2-6 PG 16 WC Operations Research & Management Science SC Operations Research & Management Science GA FY787 UT WOS:A1991FY78700004 ER PT J AU CHALMERS, AC GRECO, CM MILLER, RG AF CHALMERS, AC GRECO, CM MILLER, RG TI PROGNOSIS IN AZT MYOPATHY SO NEUROLOGY LA English DT Article ID IMMUNODEFICIENCY VIRUS-INFECTION; IMMUNE-DEFICIENCY SYNDROME; ZIDOVUDINE THERAPY; AIDS; COMPLEX; ARC AB The myopathy caused by zidovudine (AZT) appears to be common but is incompletely characterized, particularly regarding prognosis. Twenty patients with HIV infection developed a necrotizing myopathy while taking AZT for 9 to 30 months. Ten presented with myalgia and 17 with proximal muscle weakness. Serum CK was elevated in all (two to 11 times normal), and EMG suggested active myopathy in all but two. There were scattered granular degenerating fibers, with scant or no inflammation, in a pattern consistent with a toxic myopathy in all 18 patients biopsied. Three patients with an HIV-related inflammatory myopathy were distinguished by histologic differences. After stopping AZT (n = 15), myalgia promptly resolved (10 of 10). Strength improved more slowly with 12 to 15 regaining normal or nearly normal strength, but three have persistent weakness. CK returned to normal in 12 of 15, and follow-up EMG (n = 11) documented reduced fibrillation density in all 11 patients. These findings underscore the need for early diagnosis of this reversible myopathy. C1 CHILDRENS HOSP SAN FRANCISCO,DEPT NEUROL,3700 CALIF ST,SAN FRANCISCO,CA 94118. UNIV CALIF SAN FRANCISCO,SAN FRANCISCO,CA 94143. CHILDRENS HOSP SAN FRANCISCO,DEPT PATHOL,SAN FRANCISCO,CA. USN HOSP,SAN DIEGO,CA 92134. NR 22 TC 61 Z9 62 U1 0 U2 0 PU LITTLE BROWN CO PI BOSTON PA 34 BEACON STREET, BOSTON, MA 02108-1493 SN 0028-3878 J9 NEUROLOGY JI Neurology PD AUG PY 1991 VL 41 IS 8 BP 1181 EP 1184 PG 4 WC Clinical Neurology SC Neurosciences & Neurology GA GA850 UT WOS:A1991GA85000005 PM 1714057 ER PT J AU SHIN, YS MILSTER, PF KNOUSE, ST AF SHIN, YS MILSTER, PF KNOUSE, ST TI PARAMETRIC STUDIES ON THE MEASUREMENTS OF DAMPING QUANTITIES SO NUCLEAR ENGINEERING AND DESIGN LA English DT Article; Proceedings Paper CT 6TH INTERNATIONAL CONF ON PRESSURE VESSEL TECHNOLOGY CY SEP 11-16, 1988 CL BEIJING, PEOPLES R CHINA AB Damping is a property of a structure or specimen which describes how rapidly a mode of vibration decays once it is excited. The energy dissipation due to damping mechanism in the system or specimen is a complex phenomenon which depends on many parameters. There is usually significant variation in the measured damping quantity. The parametric studies were performed to investigate the effect of sensitive parameters on the measured damping quantities; air and water, temperature, frequency and boundary conditions. The type of excitation used was random noise. A flat plate configuration was used to minimize extraneous energy losses (i.e. joints) associated with built-up structure. The wide range of excitation frequencies is considered to understand the frequency-dependent damping characteristics in both air and water media. As a results of investigation, the sensitivities of damping quantities were tabulated and discussed. RP SHIN, YS (reprint author), USN,POSTGRAD SCH,DEPT MECH ENGN,MONTEREY,CA 93943, USA. NR 4 TC 0 Z9 0 U1 0 U2 1 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 AUG PY 1991 VL 129 IS 3 BP 357 EP 366 DI 10.1016/0029-5493(91)90144-7 PG 10 WC Nuclear Science & Technology SC Nuclear Science & Technology GA GG272 UT WOS:A1991GG27200013 ER PT J AU RABINOVICH, WS FELDMAN, BJ GILBREATH, GC AF RABINOVICH, WS FELDMAN, BJ GILBREATH, GC TI SUPPRESSION OF PHOTOREFRACTIVE BEAM FANNING USING ACHROMATIC GRATINGS SO OPTICS LETTERS LA English DT Article ID BATIO3 AB We show that achromatic grating techniques, using the 488- and 514.5-nm lines of the argon-ion laser, can suppress beam fanning while still allowing two-beam coupling to occur. The suppression is studied as a function of the ratio of the two colors used to form the achromatic grating. C1 USN,RES LAB,COMMUN SYST TECHNOL BRANCH,WASHINGTON,DC 20375. RP RABINOVICH, WS (reprint author), USN,RES LAB,LASER PHYS BRANCH,WASHINGTON,DC 20375, USA. NR 12 TC 43 Z9 46 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 AUG 1 PY 1991 VL 16 IS 15 BP 1147 EP 1149 DI 10.1364/OL.16.001147 PG 3 WC Optics SC Optics GA GA143 UT WOS:A1991GA14300007 PM 19776902 ER PT J AU KIM, J ELLIS, GL MOUNSDON, TA AF KIM, J ELLIS, GL MOUNSDON, TA TI USEFULNESS OF ANTIKERATIN IMMUNOREACTIVITY IN OSTEOSARCOMAS OF THE JAW SO ORAL SURGERY ORAL MEDICINE ORAL PATHOLOGY ORAL RADIOLOGY AND ENDODONTICS LA English DT Article ID INTERMEDIATE FILAMENT PROTEINS; PARAFFIN SECTIONS; OSTEO-SARCOMA; MONOCLONAL-ANTIBODIES; PROTEOLYTIC-ENZYMES; SIZED FILAMENTS; SALIVARY-GLANDS; PAROTID-GLAND; PAP TECHNIQUE; PLASMA-CELLS AB The immunohistochemical typing of cytoplasmic intermediate filaments has proved helpful to the pathologist in classifying poorly differentiated malignant neoplasms. In general, identification of keratin-type intermediate filaments has been associated with epithelial histodifferentiation, but several exceptions to this generalization have been reported in the literature. A recent report identified false-positive immunostaining for keratin in osteosarcomas of the jaws that was attributed to cross-reactivity induced by enzyme digestion of the tissue specimens before immunostaining. Because the jaws are unique in the skeletal system because of their relatively high incidence of intraosseous epithelial neoplasms, false-positive immunoreactions for keratin could complicate differentiating sarcomatoid epithelial neoplasms from poorly differentiated osteosarcomas. To evaluate this possible pitfall in our laboratory, eight osteosarcomas of the jaws were evaluated for keratin immunostaining with polyclonal and monoclonal antibodies on tissue sections that had been enzymatically treated with protease. No immunostaining was demonstrated in these tumors. Repudiation of the usefulness of antikeratin immunohistochemistry for intraosseous jaw tumors was not confirmed with the procedures used in our laboratory. C1 ARMED FORCES INST PATHOL,DEPT ORAL PATHOL,WASHINGTON,DC 20306. ARMED FORCES INST PATHOL,DEPT VET AFFAIRS,SPECIAL REFERENCE LAB,WASHINGTON,DC 20306. YONSEI UNIV,SCH DENT,DIV ORAL PATHOL,SEOUL,SOUTH KOREA. USN,SCH DENT,DEPT ORAL PATHOL,BETHESDA,MD 20814. NR 58 TC 3 Z9 3 U1 0 U2 0 PU MOSBY-YEAR BOOK INC PI ST LOUIS PA 11830 WESTLINE INDUSTRIAL DR, ST LOUIS, MO 63146-3318 SN 1079-2104 J9 ORAL SURG ORAL MED O JI Oral Surg. Oral Med. Oral Pathol. Oral Radiol. Endod. PD AUG PY 1991 VL 72 IS 2 BP 213 EP 217 DI 10.1016/0030-4220(91)90166-A PG 5 WC Dentistry, Oral Surgery & Medicine SC Dentistry, Oral Surgery & Medicine GA GB039 UT WOS:A1991GB03900015 PM 1717917 ER PT J AU DOYLE, RJ AF DOYLE, RJ TI THE GAS-PHASE DISSOCIATION OF A NEW POLYAZAPOLYCYCLIC NITRAMINE - HEXANITROHEXAZAISOWURTZITANE SO ORGANIC MASS SPECTROMETRY LA English DT Letter ID ELECTRON-IMPACT FRAGMENTATION; MASS-SPECTRAL FRAGMENTATION; HEXAHYDRO-1,3,5-TRINITRO-1,3,5-TRIAZINE; SPECTROMETRY; CHEMISTRY; IONS; RDX; HMX RP DOYLE, RJ (reprint author), USN,RES LAB,DIV CHEM,CODE 6113,WASHINGTON,DC 20375, USA. NR 20 TC 11 Z9 13 U1 0 U2 0 PU JOHN WILEY & SONS LTD PI W SUSSEX PA BAFFINS LANE CHICHESTER, W SUSSEX, ENGLAND PO19 1UD SN 0030-493X J9 ORG MASS SPECTROM JI Org. Mass Spectrom. PD AUG PY 1991 VL 26 IS 8 BP 723 EP 726 DI 10.1002/oms.1210260812 PG 4 WC Chemistry, Organic; Spectroscopy SC Chemistry; Spectroscopy GA FZ739 UT WOS:A1991FZ73900010 ER PT J AU BROOK, I AF BROOK, I TI ROLE OF ORAL BACTERIA SO PEDIATRIC INFECTIOUS DISEASE JOURNAL LA English DT Letter DE ORAL BACTERIA; PURULENT NASAL DISCHARGE RP BROOK, I (reprint author), USN HOSP,DEPT PEDIAT,BETHESDA,MD 20814, USA. NR 2 TC 0 Z9 0 U1 0 U2 0 PU WILLIAMS & WILKINS PI BALTIMORE PA 351 WEST CAMDEN ST, BALTIMORE, MD 21201-2436 SN 0891-3668 J9 PEDIATR INFECT DIS J JI Pediatr. Infect. Dis. J. PD AUG PY 1991 VL 10 IS 8 BP 628 EP 628 DI 10.1097/00006454-199108000-00020 PG 1 WC Immunology; Infectious Diseases; Pediatrics SC Immunology; Infectious Diseases; Pediatrics GA GA463 UT WOS:A1991GA46300020 PM 1891299 ER PT J AU TRITT, TM MARONE, M CHEN, XF SKOVE, MJ EHRLICH, AC TESSEMA, GX GILLESPIE, DJ FRANCK, JP JUNG, J AF TRITT, TM MARONE, M CHEN, XF SKOVE, MJ EHRLICH, AC TESSEMA, GX GILLESPIE, DJ FRANCK, JP JUNG, J TI MEASURE OF THE MAGNITUDE OF YOUNG MODULUS IN WHISKER-LIKE SAMPLES OF THE BI-BASED HIGH-TC MATERIALS BI2SR2CACU2OX AND BI2SR2CA2CU3OX SO PHYSICA C LA English DT Article ID O COMPOUND SYSTEM; CA-CU OXIDE; ELASTIC PROPERTIES; SINGLE-CRYSTALS; SUPERCONDUCTIVITY; PRESSURE; DEPENDENCE; INSTABILITY; TRANSITIONS; ANOMALIES AB We have measured Young's modulus in ribbon-like whisker samples of the high-T(c) materials: Bi2Sr2CaCu2Ox and Bi2Sr2Ca2Cu3Ox. This is the first direct measurement of Young's modulus for whiskers of any of the high T(c) materials. We used a stress-strain probe that applies an axial force (uniaxial stress) to the whisker-like sample and simultaneously measures the corresponding sample elongation. The slope of the resulting stress-strain curve yields the magnitude of Young's modulus (Y). We found these Bi based high-T(c) materials to be soft with Y almost-equal-to 20 GPa for Bi2Sr2CaCu2Ox and Y almost-equal-to 25 GPa for Bi2Sr2Ca2Cu3Ox. C1 CLEMSON UNIV,DEPT PHYS,CLEMSON,SC 29634. UNIV ALBERTA,DEPT PHYS,EDMONTON T6G 2J1,ALBERTA,CANADA. RP TRITT, TM (reprint author), USN,RES LAB,MAT PHYS BRANCH,WASHINGTON,DC 20375, USA. NR 42 TC 19 Z9 19 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 AUG 1 PY 1991 VL 178 IS 4-6 BP 296 EP 300 DI 10.1016/0921-4534(91)90077-C PG 5 WC Physics, Applied SC Physics GA GB506 UT WOS:A1991GB50600006 ER PT J AU MAHON, CR DEXTER, JL PILLET, P GALLAGHER, TF AF MAHON, CR DEXTER, JL PILLET, P GALLAGHER, TF TI IONIZATION OF SODIUM AND LITHIUM RYDBERG ATOMS BY 10-MHZ TO 15-GHZ ELECTRIC-FIELDS SO PHYSICAL REVIEW A LA English DT Article ID MICROWAVE IONIZATION; STATES AB We have studied the ionization of Na ns and nd Rydberg atoms by approximately 1-mu-s pulses of 10-MHz, 670-MHz, 2-GHz, and 4-GHz fields, bridging the gap between the previous measurements of ionization by approximately 1-mu-s rise-time pulses and 8- and 15-GHz microwave fields. We have also studied the ionization of Li ns and nd Rydberg atoms by 4-, 8-, and 15-GHz fields, which, due to the smaller Li quantum defects, represents the high-frequency limit of nonhydrogenic microwave ionization. The Na measurements show that ionization at 10 MHz occurs without change in n at fields of 1/16n4 and 1/9n4. At 670 MHz \m\ = 0, 1, and 2 states are all ionized at fields between 1/3n5 and 1/9n4, indicating that transitions to higher-n states are occurring. As the frequency is raised further, to 2 and 4 GHz, the \m\ = 0 and 1 states exhibit an increasingly sharp threshold for ionization at E = 1/3n5, but the \m\ = 2 states are unlikely to ionize at this field, with ionization occurring mostly at higher fields, 1/3n5 < E < 1/9n4, approaching the 15-GHz behavior of ionization at E = 1/9n4. At 4 GHz, Li n = 20 \m\ = 0 and 1 states ionize at E = 1/3n5, but at n congruent-to 45, \m\ = 1 states ionize at E = 1/9n4, and the \m\ = 0 states ionize at E > 1/3n5. The \m\ = 2 states appear to ionize at E = 1/9n4. As the frequency is raised to 8 and then to 15 GHz, the transition of \m\ = 0 and 1 states to ionization at E = 1/9n4 occurs at lower n. When a small static field is applied, the Li ionization threshold fields drop from 1/9n4 to fields somewhat above 1/3n5. Together the Na and Li measurements show that microwave ionization depends on a rate-limiting step, which is a resonant multiphoton transition. C1 UNIV VIRGINIA, DEPT PHYS, CHARLOTTESVILLE, VA 22901 USA. USN, RES LAB, LASER PHYS BRANCH, WASHINGTON, DC 20375 USA. NR 23 TC 28 Z9 28 U1 0 U2 1 PU AMER PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1050-2947 EI 1094-1622 J9 PHYS REV A JI Phys. Rev. A PD AUG 1 PY 1991 VL 44 IS 3 BP 1859 EP 1873 DI 10.1103/PhysRevA.44.1859 PG 15 WC Optics; Physics, Atomic, Molecular & Chemical SC Optics; Physics GA GA169 UT WOS:A1991GA16900060 ER PT J AU JIANG, CG FLETCHER, G FRY, JL PAPACONSTANTOPOULOS, DA AF JIANG, CG FLETCHER, G FRY, JL PAPACONSTANTOPOULOS, DA TI CALCULATION OF THE SUPERCONDUCTING PARAMETER (I2) FOR HCP TRANSITION-METALS SO PHYSICAL REVIEW B LA English DT Article ID ELECTRON-PHONON INTERACTION; TIGHT-BINDING; LINEAR-COMBINATION; ENHANCEMENT; TEMPERATURE AB The Fermi-surface-averaged electron-phonon interaction has been computed for 12 hexagonal-close-packed transition metals in the 3d, 4d, and 5d series. The calculations were first done with a quasiorthogonal tight-binding formalism based on Frohlich's modified tight-binding wave function. This method employed accurate Slater-Koster fits to scalar-relativistic augmented-plane-wave band structures, and scaling laws to determine gradients of Slater-Koster parameters. The second method employed the rigid-muffin-tin approximation and the augmented-plane-wave band structures. The two methods gave the same systematic trends across the series and good agreement between computed values for most elements. Differences in some cases are attributed to sensitivity of the calculation to band-structure parameters and different approximations employed. The two results were compared with empirically deduced values and other theoretical calculations. Single-atomic character, crystal structure, and the area and complexity of the Fermi surface have been found to be important in determining the behavior of . C1 USN,RES LAB,COMPLEX SYST THEORY GRP,WASHINGTON,DC 20375. RP JIANG, CG (reprint author), UNIV TEXAS,DEPT PHYS,BOX 19059,ARLINGTON,TX 76019, USA. NR 34 TC 2 Z9 2 U1 0 U2 2 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD AUG 1 PY 1991 VL 44 IS 5 BP 2268 EP 2275 DI 10.1103/PhysRevB.44.2268 PG 8 WC Physics, Condensed Matter SC Physics GA GA076 UT WOS:A1991GA07600032 ER PT J AU RAJAGOPAL, AK VASUDEVAN, R AF RAJAGOPAL, AK VASUDEVAN, R TI LINEARIZED GAP EQUATION FOR A SUPERCONDUCTOR IN A STRONG MAGNETIC-FIELD SO PHYSICAL REVIEW B LA English DT Note AB A linearized gap equation for a superconductor in the presence of a strong magnetic field incorporating the Landau-level spectrum, the Pauli term, as well as the dynamical interaction is given. The most commonly used model of a BCS-type pairing interaction of strength VBAR is a special case of the dynamical interaction, and in this case an exact solution to this linearized gap equation was obtained by us before. From this solution, several new results recently obtained by Tesanovic et al. are recovered. By expressing the solution in terms of the Landau states, the Cooper pairing is shown to involve many Landau levels. C1 INST MATH SCI,MADRAS 60113,INDIA. RP RAJAGOPAL, AK (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 6 TC 7 Z9 7 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 AUG 1 PY 1991 VL 44 IS 6 BP 2807 EP 2810 DI 10.1103/PhysRevB.44.2807 PG 4 WC Physics, Condensed Matter SC Physics GA GA077 UT WOS:A1991GA07700046 ER PT J AU SARPKAYA, T AF SARPKAYA, T TI ON THE ACCURATE CALCULATION OF VORTEX SHEDDING - COMMENT SO PHYSICS OF FLUIDS A-FLUID DYNAMICS LA English DT Editorial Material RP SARPKAYA, T (reprint author), USN,POSTGRAD SCH,DEPT MECH ENGN,MONTEREY,CA 93943, USA. NR 6 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 0899-8213 J9 PHYS FLUIDS A-FLUID PD AUG PY 1991 VL 3 IS 8 BP 2013 EP 2013 DI 10.1063/1.857883 PG 1 WC Mechanics; Physics, Fluids & Plasmas SC Mechanics; Physics GA FY795 UT WOS:A1991FY79500025 ER PT J AU KAPETANAKOS, CA LEN, LK SMITH, T DIALETIS, D MARSH, SJ LOSCHIALPO, P GOLDEN, J MATHEW, J CHANG, JH AF KAPETANAKOS, CA LEN, LK SMITH, T DIALETIS, D MARSH, SJ LOSCHIALPO, P GOLDEN, J MATHEW, J CHANG, JH TI COMPACT, HIGH-CURRENT ACCELERATORS AND THEIR PROSPECTIVE APPLICATIONS SO PHYSICS OF FLUIDS B-PLASMA PHYSICS LA English DT Article ID MODIFIED-BETATRON ACCELERATOR; RING AB This paper briefly surveys the three compact, high-current accelerators that are presently under development in the United States in support of a national program. In addition, it reports recent experimental results from the Naval Research Laboratory (NRL) modified betatron [Phys. Rev. Lett. 64, 2374 (1990)] with emphasis on the electron-cyclotron resonance that presently limits the energy of the beam to approximately 18 MeV. Finally, it briefly addresses selective existing and prospective applications of accelerators. C1 FM TECHNOL INC,FAIRFAX,VA 22032. SCI APPLICAT INT CORP,MCLEAN,VA 22102. SFA INC,LANDOVER,MD 20785. BERKELEY RES ASSOCIATES INC,SPRINGFIED,VA 22151. RP KAPETANAKOS, CA (reprint author), USN,RES LAB,DIV PLASMA PHYS,WASHINGTON,DC 20375, USA. NR 25 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 0899-8221 J9 PHYS FLUIDS B-PLASMA PD AUG PY 1991 VL 3 IS 8 BP 2396 EP 2402 DI 10.1063/1.859609 PN 2 PG 7 WC Physics, Fluids & Plasmas SC Physics GA FY451 UT WOS:A1991FY45100035 ER PT J AU THOMAS, JR AHLERS, ST SHURTLEFF, D AF THOMAS, JR AHLERS, ST SHURTLEFF, D TI THERMAL-STRESS MODULATES TEMPORAL PATTERNS OF RESPONDING ON A MULTIPLE DRL-FR SCHEDULE SO PHYSIOLOGY & BEHAVIOR LA English DT Article DE THERMAL STRESS; COLD STRESS; HEAT STRESS; TEMPORAL RESPONDING; DIFFERENTIAL-REINFORCEMENT-OF-LOW-RATES FIXED-RATIO; REINFORCEMENT SCHEDULE; RATS ID MODERATE COLD; TIME PERCEPTION; INTERNAL CLOCK; D-AMPHETAMINE; CHLORDIAZEPOXIDE; METHAMPHETAMINE; REINFORCEMENT; PERFORMANCE; EXPOSURE; PIGEONS AB To investigate temporal changes in behavior induced by moderate cold temperatures, rats performing on a multiple differential-reinforcement-of-low-rate (DRL) fixed-ratio (FR) schedule were exposed to ambient temperatures of 2, 8, 16, and 24-degrees-C. DRL response rates markedly increased with decreasing cold temperatures, while FR response rates remained unchanged. In addition, as ambient temperatures decreased, the interresponse time (IRT) distribution of DRL responses shifted toward shorter times and short IRT bursts increased. Compared with cold effects, exposure to 38-degrees-C heat induced decreases in both DRL and FR response rates which were associated with increases in long IRTs. Decreases in reinforcement frequency were associated only with the DRL schedule in cold, and with both DRL and FR schedules during heat exposures. The distinct effects of cold and heat on both DRL and FR responding suggest that the increases in DRL response rates and shifts in IRT distribution are unique to cold, and are not due to general effects of nonspecific thermal change in the ambient environment. RP THOMAS, JR (reprint author), USN,MED RES INST,DIV BEHAV NEUROSCI,THERMAL STRESS ADAPTAT PROGRAMMS-11,BETHESDA,MD 20889, USA. NR 36 TC 4 Z9 4 U1 1 U2 1 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0031-9384 J9 PHYSIOL BEHAV JI Physiol. Behav. PD AUG PY 1991 VL 50 IS 2 BP 437 EP 442 DI 10.1016/0031-9384(91)90091-2 PG 6 WC Psychology, Biological; Behavioral Sciences SC Psychology; Behavioral Sciences GA GG616 UT WOS:A1991GG61600027 PM 1745691 ER PT J AU MEIER, RR SAMSON, JAR CHUNG, Y LEE, EM HE, ZX AF MEIER, RR SAMSON, JAR CHUNG, Y LEE, EM HE, ZX TI PRODUCTION OF N+-STAR FROM N-2+HV - EFFECTIVE EUV EMISSION YIELDS FROM LABORATORY AND DAYGLOW DATA SO PLANETARY AND SPACE SCIENCE LA English DT Article ID PHOTOIONIZATION CROSS-SECTIONS; EXTREME ULTRAVIOLET EMISSION; ACTIVE SOLAR CONDITIONS; ELECTRON-IMPACT; MEDIUM-RESOLUTION; FAR ULTRAVIOLET; SPECTROSCOPY; NITROGEN; N2; CO AB Photodissociative ionization of N2 into the unbound N2+ H 2-SIGMA-g+ state is identified as the parentage of a number of N+ and N excited states that contribute to the u.v. dayglow. Yields have been obtained for the production of extreme ultraviolet emission lines of N+ (and N) from a laboratory experiment using a broad-band synchrotron radiation source with fluorescence spectroscopy. The yields are termed "effective", in that they are constant percentages of the H state cross section. These are compared with effective yields needed to reproduce NII 1085 and 916 angstrom lines from four dayglow observations using a model of solar energy deposition and photoelectron production and loss in the Earth's thermosphere. The 1085 angstrom effective yield measured in the laboratory (18%) agrees with that from the dayglow data (average of 17%) to well within experimental uncertainties. Thus, we conclude that photodissociative ionization of N2 is the primary source of the NII 1085 angstrom dayglow. However, there is an order of magnitude discrepancy among the various dayglow observations of the 1085/916 intensity ratio, only one of which is consistent with the laboratory observation of 4.4. Neither contamination by other dayglow features nor atmospheric extinction can account for the disparities. Laboratory measurements of N2 and O2 absorption cross sections at these wavelengths are also reported. C1 UNIV NEBRASKA,BEHLEN LAB PHYS,LINCOLN,NE 68588. RP MEIER, RR (reprint author), USN,RES LAB,EO HULBURT CTR SPACE RES,WASHINGTON,DC 20375, USA. RI Meier, Robert/G-4749-2014 OI Meier, Robert/0000-0001-8497-7115 NR 46 TC 22 Z9 22 U1 0 U2 3 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0032-0633 J9 PLANET SPACE SCI JI Planet Space Sci. PD AUG PY 1991 VL 39 IS 8 BP 1197 EP 1207 DI 10.1016/0032-0633(91)90171-6 PG 11 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA GF164 UT WOS:A1991GF16400013 ER PT J AU MARRIAN, CRK DOBISZ, EA PECKERAR, MC AF MARRIAN, CRK DOBISZ, EA PECKERAR, MC TI NANOSTRUCTURE PATTERNING SO PROCEEDINGS OF THE IEEE LA English DT Article ID SCANNING TUNNELING MICROSCOPE; BEAM RESIST; SUPERLATTICES; IMPLANTATION; LITHOGRAPHY; SILICON; GAAS; SI AB Research at the Naval Research Laboratory (NRL) in the lithography, patterning, and fabrication of structures of nanometer scale dimensions is reviewed in this paper. E-beam lithography at high (50 keV) and low (5 eV) energies on resist systems developed at NRL is described. The low energy lithography takes advantage of the spatially confined e-beam available in a scanning tunneling microscope type probe. This instrument allows an in situ exposure and characterization of an e-beam sensitive material. A novel approach for implementing dose correction for proximity effects in e-beam lithography is presented using an error measure based on the physical realities of lithography. The compositional disordering of GaAs/GaxAl1-xAs heterostructures as a technique for pattern replication is described. Introducing silicon into the heterostructure (by implantation or diffusion) enhances the aluminum and gallium interdiffusion which can be used for patterning. A complete bibliography of recently published results is included. C1 USN,RES LAB,NANOELECTR PROC FACIL,WASHINGTON,DC 20375. RP MARRIAN, CRK (reprint author), USN,RES LAB,DIV ELECTR SCI & TECHNOL,WASHINGTON,DC 20375, USA. NR 35 TC 2 Z9 2 U1 0 U2 2 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0018-9219 J9 P IEEE JI Proc. IEEE PD AUG PY 1991 VL 79 IS 8 BP 1149 EP 1158 DI 10.1109/5.92074 PG 10 WC Engineering, Electrical & Electronic SC Engineering GA GH439 UT WOS:A1991GH43900007 ER PT J AU FENG, CR MICHEL, DJ AF FENG, CR MICHEL, DJ TI MICROSTRUCTURE OF EXTRUDED XDTM NB-26TI-48AL+(NB, TI)B SO SCRIPTA METALLURGICA ET MATERIALIA LA English DT Article ID ALLOYS RP FENG, CR (reprint author), USN,RES LAB,DEPT MET SCI & TECHNOL,WASHINGTON,DC 20375, USA. NR 8 TC 1 Z9 2 U1 1 U2 2 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 AUG PY 1991 VL 25 IS 8 BP 1793 EP 1798 DI 10.1016/0956-716X(91)90306-L PG 6 WC Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Materials Science; Metallurgy & Metallurgical Engineering GA FZ561 UT WOS:A1991FZ56100007 ER PT J AU MACCLUER, CR RADCLIFFE, CJ HULL, AJ AF MACCLUER, CR RADCLIFFE, CJ HULL, AJ TI DIAGONALIZING ACOUSTIC MODELS SO SIAM JOURNAL ON APPLIED MATHEMATICS LA English DT Article DE DIFFERENTIAL OPERATOR; ORTHOGONAL EIGENFUNCTIONS; TRANSIENT ACOUSTIC RESPONSE; INNER PRODUCTS ID SOUND; DUCTS AB There exists an equivalent inner product under which one-dimensional transient acoustic problems with partially absorbent terminations decouple and thus yield to separation of variables. C1 MICHIGAN STATE UNIV,DEPT MECH ENGN,E LANSING,MI 48824. USN,CTR UNDERWATER SYST,NEW LONDON,CT 06320. RP MACCLUER, CR (reprint author), MICHIGAN STATE UNIV,DEPT MATH,E LANSING,MI 48824, USA. NR 8 TC 1 Z9 1 U1 0 U2 0 PU SIAM PUBLICATIONS PI PHILADELPHIA PA 3600 UNIV CITY SCIENCE CENTER PH#382-9800, PHILADELPHIA, PA 19104-2688 SN 0036-1399 J9 SIAM J APPL MATH JI SIAM J. Appl. Math. PD AUG PY 1991 VL 51 IS 4 BP 1006 EP 1010 DI 10.1137/0151050 PG 5 WC Mathematics, Applied SC Mathematics GA FX964 UT WOS:A1991FX96400008 ER PT J AU GAVER, DP MORRISON, JA AF GAVER, DP MORRISON, JA TI HEAVY-TRAFFIC ANALYSIS OF MULTITYPE QUEUING UNDER PROBABILISTICALLY LOAD-PREFERENTIAL SERVICE ORDER SO SIAM JOURNAL ON APPLIED MATHEMATICS LA English DT Article DE ASYMPTOTICS; DYNAMIC PRIORITY RULES; LOGISTICS; REPAIR PROBLEMS AB A model of queueing for a single server by several types of customers (messages, or jobs), with a simple dynamic priority rule, is considered. The rule is equivalent to selecting the next server occupant type with a probability proportional to the number of that type enqueued. The situation studied here occurs in fields such as computer and communication system performance analysis, in operational analysis of logistics systems, and in the repair of elements of a manufacturing system. It is assumed that the population sizes of the items of different types are large and that the mean service rates are correspondingly large in comparison with the service demand rates. Moreover, it is assumed that the system is in heavy traffic. Under these assumptions, asymptotic approximations are derived for the steady-state means and covariances of the number of items of different types either waiting or being served. Numerical comparisons with simulated results show excellent agreement. C1 AT&T BELL LABS,MURRAY HILL,NJ 07974. RP GAVER, DP (reprint author), USN,POSTGRAD SCH,MONTEREY,CA 93940, USA. NR 8 TC 1 Z9 1 U1 0 U2 0 PU SIAM PUBLICATIONS PI PHILADELPHIA PA 3600 UNIV CITY SCIENCE CENTER PH#382-9800, PHILADELPHIA, PA 19104-2688 SN 0036-1399 J9 SIAM J APPL MATH JI SIAM J. Appl. Math. PD AUG PY 1991 VL 51 IS 4 BP 1134 EP 1149 DI 10.1137/0151057 PG 16 WC Mathematics, Applied SC Mathematics GA FX964 UT WOS:A1991FX96400015 ER PT J AU WEBB, AW KIM, KH BOULDIN, C AF WEBB, AW KIM, KH BOULDIN, C TI THE VALENCE OF COPPER IN LACUO3 - AN X-RAY ABSORPTION STUDY SO SOLID STATE COMMUNICATIONS LA English DT Article ID SUPERCONDUCTIVITY; SYSTEM AB The simplest member of the family of the perovskite-structured, Cu-based high-temperature superconductors is the rhombohedrally-distorted LaCuO3. Formal valence rules would assign the trivalent state to Cu. The X-ray near-edge structure of LaCuO3 has been studied around the copper K-edge at 8979 eV to confirm this Cu valency, using standard compounds for reference. As with La2CuO4 and YBa2Cu3O(7-y), the Cu in LaCuO3 was found to be divalent in character. C1 NATL INST STAND & TECHNOL,GAITHERSBURG,MD 20899. RP WEBB, AW (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 9 TC 11 Z9 11 U1 0 U2 1 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0038-1098 J9 SOLID STATE COMMUN JI Solid State Commun. PD AUG PY 1991 VL 79 IS 6 BP 507 EP 508 DI 10.1016/0038-1098(91)90040-3 PG 2 WC Physics, Condensed Matter SC Physics GA GC772 UT WOS:A1991GC77200011 ER PT J AU ERWIN, SC PICKETT, WE AF ERWIN, SC PICKETT, WE TI DIAMOND-NICKEL INTERFACES - CALCULATION OF THE ELECTRONIC AND ATOMIC-STRUCTURE AND SCHOTTKY BARRIERS SO SURFACE & COATINGS TECHNOLOGY LA English DT Article; Proceedings Paper CT 1ST EUROPEAN CONF ON DIAMOND AND DIAMOND-LIKE CARBON COATINGS CY SEP 17-19, 1990 CL CRANS-MONTANA, SWITZERLAND SP COMMISS EUROPEAN COMMUNITIES, ATOM ENERGY AUTHORITY TECHNOL, HARWELL LAB ID BORON-NITRIDE; SUPERLATTICES; HEIGHTS AB We report the results of first-principles local-density functional calculations of abrupt diamond-nickel interfaces of four types: for both (001) and (111) interfaces we considered atomic geometries with the first nickel layer either in (i) a "tetrahedral" orientation providing a semiconductor-like coordination of the carbon atom at the interface, or (ii) an "in-hollow" orientation providing a more metallic-like coordination. The interlayer distances were optimized in each case. We find that the in-hollow geometries lead to a (hole) Schottky barrier height of 0.9 eV while the tetrahedral arrangements lead to ohmic interfaces (barrier height less than 0.1 eV). The tetrahedral arrangements are favored energetically; analysis of the electronic structure suggests that both the barrier heights and the stabilization energy are related to interface states which retain some diamond dangling-bond character. C1 USN,RES LAB,COMPLEX SYST THEORY BRANCH,WASHINGTON,DC 20375. RI Erwin, Steven/B-1850-2009 NR 15 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 AUG PY 1991 VL 47 IS 1-3 BP 487 EP 495 DI 10.1016/0257-8972(91)90315-N PG 9 WC Materials Science, Coatings & Films; Physics, Applied SC Materials Science; Physics GA GD453 UT WOS:A1991GD45300055 ER PT J AU GILFRICH, JV GILFRICH, NL SKELTON, EF KIRKLAND, JP QADRI, SB NAGEL, DJ AF GILFRICH, JV GILFRICH, NL SKELTON, EF KIRKLAND, JP QADRI, SB NAGEL, DJ TI X-RAY-FLUORESCENCE ANALYSIS OF TREE RINGS SO X-RAY SPECTROMETRY LA English DT Article AB X-ray fluorescence analysis was applied to the determination of the concentration of trace elements in the growth rings of trees. Some of these mineral elements can affect the growth and development of the plant. The results of the analytical measurements can provide information concerning the geochemical and atmospheric environment to which the tree has been exposed. It has been demonstrated that conventional x-ray fluorescence equipment is adequate to perform such measurements but, more important, the high intensity available from synchrotron radiation is an ideal source to probe the spatial variation in the low-level concentrations which can be transposed to an absolute temporal scale knowing the history of the tree. The ability to aperture or focus the synchrotron radiation to submillimeter size allows several points within individual rings to be analyzed, permitting a study of differences within a single growing season. Concentrations of mineral elements were determined in two types of tree samples, a cross-section of the trunk of a small sassafras tree and an incremental core from a red oak. Two experimental arrangements were employed, a special energy-dispersive x-ray analyzer with a primary beam size of 0.5 mm and a beam line at the National Synchrotron Light Source where the radiation was focused and apertured to 50-mu-m x 1 mm. Concentrations as low as 1 ppm were determined for nine elements. Major year-to-year variations were observed, implying that cross-ring elemental migration is slow (possibly negligible). The x-ray technique is fast and non-destructive, permitting the sample to be retained for additional studies. C1 COLORADO STATE UNIV,DEPT CHEM,FT COLLINS,CO 80523. SFA INC,1401 MCCORMACK DR,LANDOVER,MD. RP GILFRICH, JV (reprint author), USN,RES LAB,DIV CONDENSED MATTER & RADIAT SCI,WASHINGTON,DC 20375, USA. NR 11 TC 21 Z9 21 U1 1 U2 3 PU JOHN WILEY & SONS LTD PI W SUSSEX PA BAFFINS LANE CHICHESTER, W SUSSEX, ENGLAND PO19 1UD SN 0049-8246 J9 X-RAY SPECTROM JI X-Ray Spectrom. PD AUG PY 1991 VL 20 IS 4 BP 203 EP 208 DI 10.1002/xrs.1300200410 PG 6 WC Spectroscopy SC Spectroscopy GA GD290 UT WOS:A1991GD29000008 ER PT J AU ZIGLER, A BURKHALTER, PG NAGEL, DJ ROSEN, MD BOYER, K GIBSON, G LUK, TS MCPHERSON, A RHODES, CK AF ZIGLER, A BURKHALTER, PG NAGEL, DJ ROSEN, MD BOYER, K GIBSON, G LUK, TS MCPHERSON, A RHODES, CK TI MEASUREMENT OF ENERGY PENETRATION DEPTH OF SUBPICOSECOND LASER ENERGY INTO SOLID DENSITY MATTER SO APPLIED PHYSICS LETTERS LA English DT Article ID CALIBRATION; PLASMAS; CRYSTAL AB The energy penetration depth characteristic of the interaction of intense subpicosecond (approximately 600 fs) ultraviolet (248 nm) laser radiation with solid density material has been experimentally determined. This was accomplished by using a series of ultraviolet transmitting targets consisting of a fused silica (SiO2) substrate coated with an 80-600 nm layer of MgF2. The measurement of He-like and H-like Si and Mg lines, as a function of MgF2 thickness, enabled the determination of the energy penetration depth. It was found that this depth falls in the range of 250-300 nm for a laser intensity of approximately 3 X 10(16) W/cm2. Based on numerical simulations, it is estimated that solid density material to a depth of approximately 250 nm is heated to an electron temperature of approximately 500 eV. C1 UNIV CALIF LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550. UNIV ILLINOIS,CHICAGO,IL 60680. FM TECHNOL,FAIRFAX,VA 22032. RP ZIGLER, A (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 15 TC 31 Z9 31 U1 1 U2 1 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0003-6951 J9 APPL PHYS LETT JI Appl. Phys. Lett. PD JUL 29 PY 1991 VL 59 IS 5 BP 534 EP 536 DI 10.1063/1.105430 PG 3 WC Physics, Applied SC Physics GA FY713 UT WOS:A1991FY71300014 ER PT J AU LONGTIN, A BULSARA, A MOSS, F AF LONGTIN, A BULSARA, A MOSS, F TI TIME-INTERVAL SEQUENCES IN BISTABLE SYSTEMS AND THE NOISE-INDUCED TRANSMISSION OF INFORMATION BY SENSORY NEURONS SO PHYSICAL REVIEW LETTERS LA English DT Article ID AUDITORY-NERVE FIBERS; BEHAVIOR; CYCLE AB We discuss the two time-interval sequences which play a crucial role in studies of escape times in bistable systems driven by periodic functions embedded in noise. We demonstrate that the probability density of escape times for one of the sequences exhibits all the substantive features of experimental interspike interval histograms recorded from real, periodically forced sensory neurons. Our analysis relies on linking this interval sequence to the firing-reset mechanism of real neurons, and illustrates the importance of the noise, without which the substantive features cannot exist, for the transmission of sensory information. C1 UNIV CALIF LOS ALAMOS SCI LAB,CTR NONLINEAR STUDIES,DIV THEORET B213,LOS ALAMOS,NM 87545. USN,CTR OCEAN SYST,SAN DIEGO,CA 92152. UNIV MISSOURI,DEPT PHYS,ST LOUIS,MO 63121. RP LONGTIN, A (reprint author), UNIV CALIF LOS ALAMOS SCI LAB,COMPLEX SYST GRP,LOS ALAMOS,NM 87545, USA. RI Longtin, Andre/D-2443-2009 NR 28 TC 398 Z9 408 U1 2 U2 4 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0031-9007 J9 PHYS REV LETT JI Phys. Rev. Lett. PD JUL 29 PY 1991 VL 67 IS 5 BP 656 EP 659 DI 10.1103/PhysRevLett.67.656 PG 4 WC Physics, Multidisciplinary SC Physics GA FY505 UT WOS:A1991FY50500034 ER PT J AU ROSS, MM CALLAHAN, JH AF ROSS, MM CALLAHAN, JH TI FORMATION AND CHARACTERIZATION OF C60HE+ SO JOURNAL OF PHYSICAL CHEMISTRY LA English DT Letter ID SPHEROIDAL CARBON SHELLS; C-60; ION; BUCKMINSTERFULLERENE; BEAMS AB It is shown that kiloelectronvolt collisions of C60+ with helium result in not only the expected dissociation to yield smaller fragment carbon cluster ions but also the formation of fullerene-helium adduct ions corresponding to C(x)He+, where x is even and varies from 48 to 58, in agreement with Schwarz et al. This report provides the first unambiguous identification of the C60He+ product, indicating that the helium adduct formation does not require fragmentation. By use of hybrid tandem mass spectrometric techniques the mechanism of the formation of these unusual adduct species was investigated. The nature of the collisions, the energies of the process, and the products of dissociation of C60He+ provide strong evidence that the helium atom is inside of the fullerene cage structure. RP ROSS, MM (reprint author), USN,RES LAB,DIV CHEM,CODE 6113,WASHINGTON,DC 20375, USA. NR 24 TC 174 Z9 177 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 JUL 25 PY 1991 VL 95 IS 15 BP 5720 EP 5723 DI 10.1021/j100168a004 PG 4 WC Chemistry, Physical SC Chemistry GA FY388 UT WOS:A1991FY38800004 ER PT J AU DUNLAP, BI BRENNER, DW MINTMIRE, JW MOWREY, RC WHITE, CT AF DUNLAP, BI BRENNER, DW MINTMIRE, JW MOWREY, RC WHITE, CT TI GEOMETRIC AND ELECTRONIC-STRUCTURES OF C60H60, C60F60, AND C60H36 SO JOURNAL OF PHYSICAL CHEMISTRY LA English DT Article ID ICOSAHEDRAL C-60; SYMMETRICAL CLUSTERS; CARBON-ATOMS; BUCKMINSTERFULLERENE; MOLECULES; SPECTRA; STABILITY; ENERGY; FILMS; MODEL AB Local density functional methods and empirical hydrocarbon potentials are used to study the electronic and geometric structures of icosahedral C60, C60H60, and C60F60. Compared to isolated C60, the C-H and C-F bond strengths of these saturated species are reduced by over 40% and over 15% from the C-H and C-F bond strengths in methane and in tetrafluoromethane, respectively. Similar C-H bond strengths are found for C60H36 and C60H60. Other C60H(n) species are optimized by using empirical potentials. Outward bonding for all hydrogen atoms is not always energetically preferred. RP DUNLAP, BI (reprint author), USN,RES LAB,THEORET CHEM SECT,CODE 6119,WASHINGTON,DC 20375, USA. RI Brenner, Donald/D-1741-2009; OI Mintmire, John/0000-0002-6551-0349; Dunlap, Brett/0000-0003-1356-6559 NR 45 TC 133 Z9 134 U1 0 U2 1 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0022-3654 J9 J PHYS CHEM-US JI J. Phys. Chem. PD JUL 25 PY 1991 VL 95 IS 15 BP 5763 EP 5768 DI 10.1021/j100168a012 PG 6 WC Chemistry, Physical SC Chemistry GA FY388 UT WOS:A1991FY38800012 ER PT J AU PACE, MD AF PACE, MD TI EPR-SPECTRA OF PHOTOCHEMICAL NO2 FORMATION IN MONOCYCLIC NITRAMINES AND HEXANITROHEXAAZAISOWURTZITANE SO JOURNAL OF PHYSICAL CHEMISTRY LA English DT Article ID ELECTRON-SPIN-RESONANCE; RADICALS; ESR AB NO2 radicals produced by ultraviolet light are studied in three condensed-phase nitramines; cyclotrimethylenetrinitramine (RDX), cyclotetramethylenetetranitramine (HMX), and hexanitrohexaazaisowurtzitane (HNIW), a newly developed nitramine. Electron paramagnetic resonance (EPR) spectroscopy is used to measure NO2 radical concentrations in polycrystalline samples of each nitramine and to analyze NO2 conformations in single crystals of HNIW. The results show that HNIW has a quantum yield of formation of NO2 radicals that is 1 order of magnitude greater than either RDX or HMX. Trapped NO2 radical sites in an HNIW single crystal are analyzed at 77 K before (I) and after (II) annealing at 298 K. For (I) the nitrogen hyperfine couplings and g values are A(x) = 5.7 mT, A(y) = 5.8 mT, A(z) = 7.0 mT and g(x) = 2.0062, g(y) = 1.9952, g(z) = 2.0020. For (II) the values are A(x) = 4.9 mT, A(y) = 5.4 mT, A(z) = 7.0 mT and g(x) = 2.0057, g(y) = 1.9927, g(z) = 2.0017. EPR spectral line shapes indicate different motional correlation times of I and II at 77 K. At 298 K stabilization of NO2 radicals in the alpha-polymorph of HNIW is attributed to trapping of NO2 in clathrate regions of the HNIW crystallites. RP PACE, MD (reprint author), USN,RES LAB,CODE 6120,WASHINGTON,DC 20375, USA. NR 33 TC 28 Z9 29 U1 0 U2 4 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0022-3654 J9 J PHYS CHEM-US JI J. Phys. Chem. PD JUL 25 PY 1991 VL 95 IS 15 BP 5858 EP 5864 DI 10.1021/j100168a028 PG 7 WC Chemistry, Physical SC Chemistry GA FY388 UT WOS:A1991FY38800028 ER PT J AU WILKINSON, PN TZIOUMIS, AK BENSON, JM WALKER, RC SIMON, RS KAHN, FD AF WILKINSON, PN TZIOUMIS, AK BENSON, JM WALKER, RC SIMON, RS KAHN, FD TI A DISRUPTED RADIO JET INSIDE THE HOST GALAXY OF THE QUASAR 3C48 SO NATURE LA English DT Article ID SPECTROSCOPY; NEBULOSITY; SPECTRUM; 3C-48; FUZZ; QSOS; FLOW AB THE nearby quasar 3C48 was the first to be optically identified 1, and its redshift, z = 0.368 (ref. 2), was the second, after that of 3C273 3, to be determined. Despite this pedigree, its detailed radio structure has remained obscure because its angular size, approximately 1 arcsec, is so small. We present here a new radio image, with resolution < 10 mas, made by very-long-baseline interferometry using an array of 17 telescopes. We find a highly disrupted radio jet quite different from those found in standard high-luminosity radio sources. The jet lies well within the body of the gas-rich host galaxy of the quasar, and we believe that its irregular shape is due to collision with a dense clump of gas in the interstellar medium of the host galaxy, rather than to any irregularity or precession of the central engine that produces the jet. C1 NATL RADIO ASTRON OBSERV,SOCORRO,NM 87801. USN,RES LAB,EO HULBURT CTR SPACE RES,WASHINGTON,DC 20375. UNIV MANCHESTER,DEPT ASTRON,MANCHESTER M13 9PL,LANCS,ENGLAND. RP WILKINSON, PN (reprint author), UNIV MANCHESTER,NUFFIELD RADIO ASTRON LABS,JORDELL BANK,MACCLESFIELD SK11 9DL,CHESHIRE,ENGLAND. NR 29 TC 56 Z9 57 U1 0 U2 0 PU MACMILLAN MAGAZINES LTD PI LONDON PA 4 LITTLE ESSEX STREET, LONDON, ENGLAND WC2R 3LF SN 0028-0836 J9 NATURE JI Nature PD JUL 25 PY 1991 VL 352 IS 6333 BP 313 EP 315 DI 10.1038/352313a0 PG 3 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA FY289 UT WOS:A1991FY28900062 ER PT J AU PORTER, KR POLO, SL LONG, GW MERRITT, SC OPRANDY, JJ AF PORTER, KR POLO, SL LONG, GW MERRITT, SC OPRANDY, JJ TI A RAPID MEMBRANE-BASED VIRAL-RNA ISOLATION METHOD FOR THE POLYMERASE CHAIN-REACTION SO NUCLEIC ACIDS RESEARCH LA English DT Note ID DOT IMMUNOASSAY C1 WALTER REED ARMY MED CTR,WASHINGTON,DC 20307. RP PORTER, KR (reprint author), USN,INST MED RES,BLDG 17,STOP 7,BETHESDA,MD 20889, USA. NR 3 TC 1 Z9 1 U1 0 U2 0 PU OXFORD UNIV PRESS UNITED KINGDOM PI OXFORD PA WALTON ST JOURNALS DEPT, OXFORD, ENGLAND OX2 6DP SN 0305-1048 J9 NUCLEIC ACIDS RES JI Nucleic Acids Res. PD JUL 25 PY 1991 VL 19 IS 14 BP 4011 EP 4011 DI 10.1093/nar/19.14.4011 PG 1 WC Biochemistry & Molecular Biology SC Biochemistry & Molecular Biology GA FY987 UT WOS:A1991FY98700046 PM 1862001 ER PT J AU MORRISH, AA PEHRSSON, PE AF MORRISH, AA PEHRSSON, PE TI EFFECTS OF SURFACE PRETREATMENTS ON NUCLEATION AND GROWTH OF DIAMOND FILMS ON A VARIETY OF SUBSTRATES SO APPLIED PHYSICS LETTERS LA English DT Article ID LOW-PRESSURE AB The effects of surface pretreatments on nucleation and growth of chemical vapor deposited diamond films were studied. The pretreatments included scratching with diamond grit, coating with a low vapor pressure, high thermal stability hydrocarbon oil, and coating with a 100-200-angstrom-thick layer of evaporated carbon. The effects of the treatments on carbide and noncarbide forming materials are described. C1 USN,RES LAB,DIV CHEM,WASHINGTON,DC 20375. RP MORRISH, AA (reprint author), USN,RES LAB,DIV OPT SCI,CODE 6522,WASHINGTON,DC 20375, USA. NR 8 TC 72 Z9 73 U1 1 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 JUL 22 PY 1991 VL 59 IS 4 BP 417 EP 419 DI 10.1063/1.105448 PG 3 WC Physics, Applied SC Physics GA FX626 UT WOS:A1991FX62600013 ER PT J AU SCHLESINGER, TE CAMMARATA, RC PROKES, SM AF SCHLESINGER, TE CAMMARATA, RC PROKES, SM TI KINETICS OF SILICIDE FORMATION IN CHROMIUM-AMORPHOUS SILICON MULTILAYERED FILMS SO APPLIED PHYSICS LETTERS LA English DT Article ID THIN-FILMS; PHASE SELECTION; NUCLEATION AB Silicide formation in multilayered thin films of chromium and amorphous silicon was investigated by differential scanning calorimetry (DSC). The DSC traces gave a large main peak that was associated with the growth of the silicide. The growth kinetics followed a linear rate law, with an activation energy of 2.6 eV and a pre-exponential factor of 7.5 X 10(7) m/s for the rate constant. An explosive silicide reaction, observed in other metal-silicon multilayered films, could not be induced in this system. C1 USN,RES LAB,WASHINGTON,DC 20375. RP SCHLESINGER, TE (reprint author), JOHNS HOPKINS UNIV,DEPT MAT SCI & ENGN,BALTIMORE,MD 21218, USA. RI Cammarata, Robert /A-3307-2010 NR 19 TC 12 Z9 12 U1 0 U2 0 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0003-6951 J9 APPL PHYS LETT JI Appl. Phys. Lett. PD JUL 22 PY 1991 VL 59 IS 4 BP 449 EP 451 DI 10.1063/1.105459 PG 3 WC Physics, Applied SC Physics GA FX626 UT WOS:A1991FX62600024 ER PT J AU CAMPILLO, AJ EVERSOLE, JD LIN, HB AF CAMPILLO, AJ EVERSOLE, JD LIN, HB TI CAVITY QUANTUM ELECTRODYNAMIC ENHANCEMENT OF STIMULATED-EMISSION IN MICRODROPLETS SO PHYSICAL REVIEW LETTERS LA English DT Article ID INHIBITED SPONTANEOUS EMISSION; DIELECTRIC MICROSPHERES; OPTICAL CAVITIES; RAMAN-SCATTERING; RESONANCES; ATOMS; TRANSITION; RADIATION; PARTICLES; SURFACES AB Cavity-QED-enhanced stimulated visible emission was observed in 14-mu-m-diam rhodamine-6G-ethanol droplets pumped by cw 514.5-nm radiation. Use of droplets provides an excellent test of cavity QED theory for spherical geometries. The mode number and order of the spherical-cavity resonances responsible for the observed emission peaks were identified and their Q values calculated from Lorenz-Mie theory. By equating stimulated gain to calculated/measured cavity losses, it was determined that spherical-cavity Q's of only 10(3)-10(4) lead to cavity QED enhancements in excess of 120 in the emission cross section of rhodamine 6G, consistent with theory. C1 POTOMAC PHOTON INC,LANHAM,MD 20706. RP CAMPILLO, AJ (reprint author), USN,RES LAB,LASER PHYS BRANCH,CODE 6546,WASHINGTON,DC 20375, USA. NR 24 TC 219 Z9 222 U1 3 U2 18 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 JUL 22 PY 1991 VL 67 IS 4 BP 437 EP 440 DI 10.1103/PhysRevLett.67.437 PG 4 WC Physics, Multidisciplinary SC Physics GA FX425 UT WOS:A1991FX42500008 ER PT J AU RUSSELL, SD AF RUSSELL, SD TI PHOTORESPONSE OF ION-DAMAGED GERMANIUM SO APPLIED OPTICS LA English DT Note ID PICOSECOND PHOTOCONDUCTIVITY; FILMS AB Ion implantation was used to create predetermined defect densities to examine photoresponse for optoelectronic switch applications. Ion-damaged germanium shows a significant decrease in photoresponsivity with implant dose, particularly with doses exceeding the critical amorphizing dose (D(c) approximately 1 x 10(14) cm-2). RP RUSSELL, SD (reprint author), USN,CTR OCEAN SYST,DIV SOLID STATE ELECTR,CODE 553,271 CATALINA BLVD,SAN DIEGO,CA 92152, USA. NR 6 TC 0 Z9 0 U1 0 U2 1 PU OPTICAL SOC AMER PI WASHINGTON PA 2010 MASSACHUSETTS AVE NW, WASHINGTON, DC 20036 SN 0003-6935 J9 APPL OPTICS JI Appl. Optics PD JUL 20 PY 1991 VL 30 IS 21 BP 2920 EP 2921 PG 2 WC Optics SC Optics GA FX920 UT WOS:A1991FX92000001 PM 20706330 ER PT J AU VRTILEK, SD PENNINX, W RAYMOND, JC VERBUNT, F HERTZ, P WOOD, K LEWIN, WHG MITSUDA, K AF VRTILEK, SD PENNINX, W RAYMOND, JC VERBUNT, F HERTZ, P WOOD, K LEWIN, WHG MITSUDA, K TI OBSERVATIONS OF SCORPIUS-X-1 WITH IUE - ULTRAVIOLET RESULTS FROM A MULTIWAVELENGTH CAMPAIGN SO ASTROPHYSICAL JOURNAL LA English DT Article DE STARS, INDIVIDUAL (SCORPIUS-X-1); ULTRAVIOLET, SPECTRA; X-RAYS, BINARIES ID QUASI-PERIODIC OSCILLATIONS; X-RAY OBSERVATIONS; CYGNUS X-2; ACCRETION DISKS; INTERSTELLAR EXTINCTION; SPECTRAL BEHAVIOR; RADIO; BINARIES; CORONAE; WINDS AB We present ultraviolet results from a multiwavelength campaign on the low-mass X-ray binary Sco X-1. The ultraviolet observations were obtained with the International Ultraviolet Explorer (IUE) and coincided with X-ray observations taken with the Japanese satellite Ginga and other observations from numerous between the strengths of the UV continuum and line fluxes and the X-ray spectral states. Models predicting UV continuum emission from the X-ray - heated surface of the companion star and from an X-ray - illuminated accretion disk were adjusted for parameters intrinsic to Sco X-1 and fitted to the data. The data/model comparison shows the following for Sco X-1, as for Cyg X-2: (1) X-ray heating of the accretion disk is the dominant source of UV emission, (2) the mass accretion rate increases monotonically along the so-called Z-shaped curve in an X-ray color-color diagram, and (3) the disk structure does not change as a function of X-ray spectral state. The accretion disk model gives a best-fit outer disk radius of (6.3 +/- 0.3) x 10(10) cm. Mass accretion rates range from 0.6 x 10(-8) M. yr-1 in the normal branch (NB) to 1.1 x 10(-8) M. yr-1 in the flaring branch (FB). The horizontal branch (HB) was not observed simultaneously in the UV and X-ray, but if the weakest state seen from earlier UV observations corresponds to the HB state, the mass accretion rate there is found to be 0.4 x 10(-8) M. yr-1. Ultraviolet emission lines from He, C, N, O, and Si were detected; all increase in intensity from the HB to the FB state. A model in which emission lines are due to photoionization of the outer disk by the X-ray source was developed and gives good agreement with the line fluxes observed in each state. The X-ray:UV:radio flux ratios of Sco X-1 measured at the lower vertex of the Z in the X-ray color-color diagram agree with those previously observed in five other X-ray binaries. We suggest that the flux at this vertex, which several theories identify with an accretion rate at the Eddington limit, may be used as a standard candle; the distance to Sco X-1 would then be 2.0 +/- 0.5 kpc. C1 INST SPACE & ASTRONAUT STUDIES,SAGAMIHARA,KANAGAWA 229,JAPAN. UNIV AMSTERDAM,ASTRON INST ANTON PANNEKOEK,1018 WB AMSTERDAM,NETHERLANDS. STATE UNIV UTRECHT,INST ASTRON,UTRECHT,NETHERLANDS. USN,RES LAB,CODE 41215,WASHINGTON,DC 20375. MIT,CTR SPACE RES,CAMBRIDGE,MA 02139. RP VRTILEK, SD (reprint author), HARVARD SMITHSONIAN CTR ASTROPHYS,60 GARDEN ST,CAMBRIDGE,MA 02138, USA. RI Mitsuda, Kazuhisa/C-2649-2008 NR 53 TC 67 Z9 67 U1 0 U2 0 PU UNIV CHICAGO PRESS PI CHICAGO PA 5720 S WOODLAWN AVE, CHICAGO, IL 60637 SN 0004-637X J9 ASTROPHYS J JI Astrophys. J. PD JUL 20 PY 1991 VL 376 IS 1 BP 278 EP 288 DI 10.1086/170278 PN 1 PG 11 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA FX238 UT WOS:A1991FX23800030 ER PT J AU SILVERSTONE, D ZIMMERMAN, T CHOPLIN, N MUNDORF, T ROSE, A STOECKER, J KELLEY, E LUE, J AF SILVERSTONE, D ZIMMERMAN, T CHOPLIN, N MUNDORF, T ROSE, A STOECKER, J KELLEY, E LUE, J TI EVALUATION OF ONCE-DAILY LEVOBUNOLOL 0.25-PERCENT AND TIMOLOL 0.25-PERCENT THERAPY FOR INCREASED INTRAOCULAR-PRESSURE SO AMERICAN JOURNAL OF OPHTHALMOLOGY LA English DT Article ID OCULAR HYPOTENSIVE EFFICACY; GLAUCOMA TREATMENT; TWICE AB In a three-month, double-masked, randomized clinical trial, we evaluated the once-daily ocular hypotensive efficacy of 0.25% levobunolol and 0.25% timolol in 80 patients with open-angle glaucoma or ocular hypertension. Thirty-seven of the 39 patients (95%) in the 0.25% levobunolol group and 35 of the 41 patients (85%) in the 0.25% timolol group successfully completed the three-month study period. The overall mean decrease in intraocular pressure was 5.3 mm Hg (22%) in the 0.25% levobunolol group and 5.4 mm Hg (22%) in the 0.25% timolol group. This difference was not statistically significant. In both treatment groups, effects on mean heart rate and blood pressure were minimal. The data suggest that levobunolol 0.25% and timolol 0.25%, administered once daily, are equally effective in the treatment of open-angle glaucoma and ocular hypertension. C1 YALE UNIV,SCH MED,DEPT OPHTHALMOL & VISUAL SCI,NEW HAVEN,CT 06510. UNIV LOUISVILLE,KENTUCKY LIONS EYE RES,LOUISVILLE,KY 40292. USN HOSP,SAN DIEGO,CA 92134. CHARLOTTE EYE EAR NOSE & THROAT HOSP,CHARLOTTE,NC. ALLERGAN PHARMACEUT INC,DEPT OPHTHALMOL CLIN RES,IRVINE,CA. NR 11 TC 14 Z9 14 U1 0 U2 0 PU OPHTHALMIC PUBL CO PI CHICAGO PA 77 WEST WACKER DR, STE 660, CHICAGO, IL 60601 SN 0002-9394 J9 AM J OPHTHALMOL JI Am. J. Ophthalmol. PD JUL 15 PY 1991 VL 112 IS 1 BP 56 EP 60 PG 5 WC Ophthalmology SC Ophthalmology GA FV107 UT WOS:A1991FV10700010 PM 1882923 ER PT J AU CARRUTHERS, TF DULING, IN AINA, O MATTINGLY, M SERIO, M AF CARRUTHERS, TF DULING, IN AINA, O MATTINGLY, M SERIO, M TI RESPONSES OF INP/GA0.47IN0.53AS/INP HETEROJUNCTION BIPOLAR-TRANSISTORS TO 1530 AND 620 NM ULTRAFAST OPTICAL PULSES SO APPLIED PHYSICS LETTERS LA English DT Article AB An npn InP/Ga0.47In0.53As/InP heterojunction bipolar transistor with a unity-gain frequency of 15 GHz was illuminated with ultrafast optical pulses at wavelengths of 620 and 1530 nm. The device responded to the pulses with an emitter current transient having a duration of 12 ps, corresponding to a bandwidth of approximately 40 GHz. A slower photocurrent component, with a decay time of approximately 100 ps, was a sensitive function of base bias and, because of the photocarrier dynamics and the grounded-collector circuit configuration, could be nulled out. C1 ALLIED SIGNAL CORP,COLUMBIA,MD 21045. RP CARRUTHERS, TF (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 10 TC 14 Z9 14 U1 0 U2 0 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0003-6951 J9 APPL PHYS LETT JI Appl. Phys. Lett. PD JUL 15 PY 1991 VL 59 IS 3 BP 327 EP 329 DI 10.1063/1.105585 PG 3 WC Physics, Applied SC Physics GA FW744 UT WOS:A1991FW74400026 ER PT J AU MORRISON, CA GRUBER, JB HILLS, ME AF MORRISON, CA GRUBER, JB HILLS, ME TI ENERGY-LEVELS OF CR3+ IONS IN C3I SITES OF Y3AL5O12 SO CHEMICAL PHYSICS LA English DT Article ID SPECTRA; DEPENDENCE AB From an analysis of the ultraviolet absorption spectrum of Cr3+ ions in Y3Al5O12 we have obtained a sufficient number of energy levels to perform a crystal-field splitting calculation for Cr3+ ions in sites of C3i symmetry in the lattice. The Hamiltonian used included Coulombic, crystal-field (C3i symmetry), spin-orbit interaction, and effective interconfiguration interaction terms and was diagonalized within the complete basis for 3d3 atomic configuration. The calculated energy levels were compared with experimental levels up to 40000 cm-1. From the data, we have assigned 29 Stark levels to Cr3+ ions in C3i sites which agree with calculated levels to within an rms deviation of 18 cm-1. The values of the parameters that give the best agreement are F(2) = 52724, F(4) = 38380, zeta = 252, alpha = 132, gamma = -124, B20 = 1091, B40 = -21574, and B43 = 27224 cm-1 (Dq = 1605, nu = 891, and nu' = -104.8 cm-1). The crystal-field splitting of Cr3+ levels in S4 lattice sites is also predicted with the use of the free-ion parameters obtained in this paper and a point-charge lattice-sum model. C1 SAN JOSE STATE UNIV, DEPT PHYS, SAN JOSE, CA 95192 USA. USN, CTR WEAP, DEPT RES, DIV CHEM, CHINA LAKE, CA 93555 USA. RP USA, ELECTR RES & DEV COMMAND, HARRY DIAMOND LABS, ADELPHI, MD 20783 USA. NR 26 TC 13 Z9 13 U1 0 U2 3 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0301-0104 EI 1873-4421 J9 CHEM PHYS JI Chem. Phys. PD JUL 15 PY 1991 VL 154 IS 3 BP 437 EP 447 DI 10.1016/0301-0104(91)85026-D PG 11 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA FW851 UT WOS:A1991FW85100008 ER PT J AU PAPACONSTANTOPOULOS, DA AF PAPACONSTANTOPOULOS, DA TI MAGNETISM IN TRANSITION-METAL HYDRIDES SO EUROPHYSICS LETTERS LA English DT Article DE GENERAL THEORIES AND COMPUTATIONAL TECHNIQUES; BAND AND ITINERANT MODELS AB Using lattic parameters determined by total energy calculations we have performed calculations of the band structure for all the 3d, 4d and 5d monohydrides in the NaCl structure. The results of these calculations are used to evaluate the Stoner criterion for ferromagnetism. We predict one strong candidate for ferromagnetism, i.e. CoH which exceeds by far the Stoner limit and two other hydrides, i.e. FeH and RhH which come close to the limit. In agreement with our results recent Mossbauer studies have shown that an f.c.c. gamma-CoH(x) with x > 0.9 becomes ferromagnetic at hydrogen pressures near 9 GPa. Similar experiments demonstrate ferromagnetism in the h.c.p. phase of FeH. We offer these results as another example of success of the local density theory in predicting properties of materials. RP PAPACONSTANTOPOULOS, DA (reprint author), USN, RES LAB, CONDENSED MATTER PHYS BRANCH, WASHINGTON, DC 20375 USA. NR 10 TC 7 Z9 7 U1 0 U2 3 PU EDP SCIENCES S A PI LES ULIS CEDEX A PA 17, AVE DU HOGGAR, PA COURTABOEUF, BP 112, F-91944 LES ULIS CEDEX A, FRANCE SN 0295-5075 J9 EUROPHYS LETT JI Europhys. Lett. PD JUL 15 PY 1991 VL 15 IS 6 BP 621 EP 624 DI 10.1209/0295-5075/15/6/010 PG 4 WC Physics, Multidisciplinary SC Physics GA FW839 UT WOS:A1991FW83900010 ER PT J AU STEVENS, SB MORRISON, CA SELTZER, MD HILLS, ME GRUBER, JB AF STEVENS, SB MORRISON, CA SELTZER, MD HILLS, ME GRUBER, JB TI EMISSION MEASUREMENTS AND CRYSTAL-FIELD CALCULATIONS FOR 4G5/2 TO 6H7/2 TRANSITIONS IN SM3+-YAG SO JOURNAL OF APPLIED PHYSICS LA English DT Article ID RARE-EARTH IONS; LANTHANUM TRIFLUORIDE; SM-YAG; FLUORESCENCE; ABSORPTION; PRESSURE AB A previously published analysis of the energy levels of Sm3+ in Y3Al5O12 (YAG) has been extended to include the 4G5/2 multiplet. New absorption and emission data are reported, and some previously reported levels have been reassigned. A theoretical calculation of intensities of emitted radiation originating at the 4G5/2 multiplet predicts that radiation emitted in transitions to the H-6(7/2) multiplet is particularly strong. The strongest transitions originate at the lowest of the three levels in the 4G5/2 multiplet. C1 USN,CTR WEAP,DEPT RES,DIV CHEM,CHINA LAKE,CA 93555. SAN JOSE STATE UNIV,DEPT PHYS,SAN JOSE,CA 95192. RP STEVENS, SB (reprint author), USA,LAB COMMAND,HARRY DIAMOND LABS,ADELPHI,MD 20783, USA. NR 12 TC 19 Z9 19 U1 1 U2 3 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0021-8979 J9 J APPL PHYS JI J. Appl. Phys. PD JUL 15 PY 1991 VL 70 IS 2 BP 948 EP 953 DI 10.1063/1.349604 PG 6 WC Physics, Applied SC Physics GA FY341 UT WOS:A1991FY34100062 ER PT J AU HORWITZ, JS CHRISEY, DB OSOFSKY, MS GRABOWSKI, KS VANDERAH, TA AF HORWITZ, JS CHRISEY, DB OSOFSKY, MS GRABOWSKI, KS VANDERAH, TA TI INSITU PULSED LASER DEPOSITION OF ND1.85CE0.15CUO4-Y SO JOURNAL OF APPLIED PHYSICS LA English DT Note ID O THIN-FILMS; SUPERCONDUCTIVITY; GROWTH AB Thin films of the electron-charge-carrying high-temperature superconductor, Nd1.85Ce0.15CuO4-y have been deposited by pulsed laser deposition on to <100> MgO and SrTiO3 substrates. Film composition, structure, and transport properties were measured as a function of deposition conditions (substrate temperature, oxygen deposition pressure, and postdeposition annealing conditions). C-axis oriented, single-phase films were formed at high substrate temperatures (900-degrees-C) in high background pressures of oxygen (200 mTorr), but were semiconducting when quenched to room temperature in either oxygen or nitrogen. A reduced oxygen background pressure during deposition at 900-degrees-C resulted in films thate were transparent and insulating due to the loss of copper. Films which were deposited at 900-degrees-C (P(oxygen) greater-than-or-equal-to 200 mTorr) and then slowly cooled in a vacuum were superconducting with a maximum T(c) (onset) of 15 K and T(c)(R = 0) of 11 K. C1 USN,CTR WEAP,DEPT RES,DIV CHEM,CHINA LAKE,CA 93555. RP HORWITZ, JS (reprint author), USN,RES LAB,DIV CONDENSED MATTER & RADIAT SCI,WASHINGTON,DC 20375, USA. RI Osofsky, Michael/A-1050-2010; OI Grabowski, Kenneth/0000-0003-0816-001X NR 12 TC 5 Z9 5 U1 0 U2 0 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0021-8979 J9 J APPL PHYS JI J. Appl. Phys. PD JUL 15 PY 1991 VL 70 IS 2 BP 1045 EP 1047 DI 10.1063/1.349691 PG 3 WC Physics, Applied SC Physics GA FY341 UT WOS:A1991FY34100081 ER PT J AU TSANG, KY WIESENFELD, K AF TSANG, KY WIESENFELD, K TI ON THE COMPARISON BETWEEN JOSEPHSON-JUNCTION ARRAY VARIATIONS SO JOURNAL OF APPLIED PHYSICS LA English DT Note AB Recent work has shown that the expected performance of a given Josephson-junction series array depends greatly on whether the coupling load is a resistor or an inductor-capacitor combination. This raises the question of how arrays using different loads can be compared in a quantitatively meaningful way, for example, with respect to the effects of noise. We show that it is possible to choose the circuit parameters so that the in-phase output for different loads is, though not identical, nearly so. The key lies in the development of a nonlinear generalization of the load impedance. C1 USN,RES INST,SPECIAL,WASHINGTON,DC 20375. RP TSANG, KY (reprint author), GEORGIA INST TECHNOL,SCH PHYS,ATLANTA,GA 30332, USA. NR 21 TC 6 Z9 6 U1 0 U2 0 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0021-8979 J9 J APPL PHYS JI J. Appl. Phys. PD JUL 15 PY 1991 VL 70 IS 2 BP 1075 EP 1077 DI 10.1063/1.349672 PG 3 WC Physics, Applied SC Physics GA FY341 UT WOS:A1991FY34100091 ER PT J AU TRIZNA, DB HANSEN, JP HWANG, P WU, J AF TRIZNA, DB HANSEN, JP HWANG, P WU, J TI LABORATORY STUDIES OF RADAR SEA SPIKES AT LOW GRAZING ANGLES SO JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS LA English DT Article ID BACKSCATTER; SURFACE AB We report on measurements of low grazing angle radar sea spikes in a laboratory wave tank. Using an X band radar with 10-cm range resolution and multiple-range bin capability, the sea spikes were observed to have a horizontal/vertical polarization ratio much larger than unity. This is similar to observations in earlier field experiments, but is in contrast to a ratio of unity recently observed for moderate grazing angles (Jessup et al., 1990). Our experiment was designed to validate the low grazing field results and to establish design criteria for spatial-temporal measurement instrumentation; single-point measurements currently used as surface truth cannot provide water surface profiles needed for modeling of radar scatter from deterministic surface features. Surface scattering features were generated using a paddle-generated wave, combined with wind waves for a series of wind speeds. The surface feature responsible for the sea spike echo was visually identified as a short wave crest, occurring on the windward side of the paddle wave, driven to extreme steepness by the passage of the faster paddle wave crest. Long decorrelation times observed in the field are also seen in these studies, of the order of 500 ms for horizontal polarization and less than 5 ms for vertical. We suggest that rather than Bragg scatter, the occurrence of similar ubiquitous features on the ocean are responsible for horizontally polarized low grazing angle sea scatter at the X band for low to moderate winds, and perhaps at other frequencies as well. C1 SCI & TECHNOL CORP,HAMPTON,VA 23666. UNIV DELAWARE,COLL MARINE STUDIES,LEWES,DE 19958. RP TRIZNA, DB (reprint author), USN,RES LAB,DIV RADAR,MAIL CODE 5303,WASHINGTON,DC 20375, USA. NR 13 TC 49 Z9 50 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 JUL 15 PY 1991 VL 96 IS C7 BP 12529 EP 12537 DI 10.1029/91JC00705 PG 9 WC Oceanography SC Oceanography GA FX746 UT WOS:A1991FX74600004 ER PT J AU HALLOCK, ZR TEAGUE, WJ THOMPSON, JD AF HALLOCK, ZR TEAGUE, WJ THOMPSON, JD TI A COMPARISON OF OBSERVED AND MODELED SEA-SURFACE TOPOGRAPHIC TIME-SERIES NEAR THE NEW-ENGLAND SEAMOUNTS SO JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS LA English DT Article ID GULF-STREAM MEANDERS; CONTINENTAL-MARGIN; KUROSHIO EXTENSION; VERTICAL STRUCTURE; CAPE-HATTERAS; FLUCTUATIONS; PROPAGATION; VARIABILITY; ALTIMETRY; CAROLINA AB Yearlong data records from four arrays of inverted echo sounders (IES) equipped with pressure sensors from the northwest Atlantic and 2-year records from a two-layer, primitive-equation numerical model of this region (including a prescribed deep western boundary current) are compared. Standard deviations of barotropic and total sea surface topographic variability and the correlations between them are examined as a function of horizontal position. Variances contained in three spectral bands (secular, longer than 150 days; mesoscale, 20-150 days; and high frequency 2-20 days) are also examined. The eastward penetration scale of modeled Gulf Stream variability shows a significant improvement over a previous comparison (Hallock et al., 1989). Standard deviations of observed sea surface height components compare favorably with those derived from model output, with maxima of about 30 cm (10 cm for the barotropic contribution). High correlations (0.6-0.8) between surface height and the barotropic component are found for both model and observations. Spectral shape is dominated by the temporal mesoscale east of the New England Seamounts for both observed and modeled variability. West of the seamounts, the secular (low frequency) band becomes more important, particularly for the surface height variability; this result is more pronounced for model output. Gulf Stream geostrophic current direction statistics from IES dynamic heights compare favorably with those derived from model dynamic heights upstream and downstream of the seamounts. RP HALLOCK, ZR (reprint author), USN,OCEANOG & ATMOSPHER RES LAB,STENNIS SPACE CTR,MS 39529, USA. NR 34 TC 5 Z9 5 U1 1 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 JUL 15 PY 1991 VL 96 IS C7 BP 12635 EP 12644 DI 10.1029/91JC01126 PG 10 WC Oceanography SC Oceanography GA FX746 UT WOS:A1991FX74600012 ER PT J AU ZACHARCHUK, CM MERCEP, M JUNE, CH WEISSMAN, AM ASHWELL, JD AF ZACHARCHUK, CM MERCEP, M JUNE, CH WEISSMAN, AM ASHWELL, JD TI VARIATIONS IN THYMOCYTE SUSCEPTIBILITY TO CLONAL DELETION DURING ONTOGENY - IMPLICATIONS FOR NEONATAL TOLERANCE SO JOURNAL OF IMMUNOLOGY LA English DT Article ID CD3/T-CELL RECEPTOR COMPLEX; REACTIVE V-BETA-6+ CELLS; MONOCLONAL-ANTIBODY; T-CELLS; ANTIGEN PRESENTATION; CYCLOSPORINE-A; ACTIVATION; DEATH; APOPTOSIS; THYMUS AB Activation of immature thymocytes via the TCR results in programmed cell death and clonal deletion. We have examined thymocytes from mice of different ages and observed that, whereas TCR-mediated signaling caused deletion of thymocytes from newborn and 3-week-old mice, it failed to delete thymocytes from mice of 1 week of age. This could not be attributed to differences in cell surface TCR expression, TCR-mediated phosphoinositide hydrolysis or Ca2+ mobilization, or total cellular levels of TCR-zeta- and eta-chains. Moreover, thymocytes of all ages were equally susceptible to corticosteroid- and Ca2+ ionophore-induced programmed cell death. These data are consistent with the notion that fetal and neonatal thymocytes represent a relatively synchronous wave of cells passing through phases in which they are susceptible and then resistant to TCR-induced programmed cell death. They also support the notion that the classical phenomenon of neonatal tolerance is due to clonal deletion and that the inability of allogeneic cells to tolerize mice at 1 week of age is because the thymocytes are refractory to TCR-alpha-beta-mediated clonal deletion. C1 NCI,BIOL RESPONSE MODIFIERS PROGRAM,BLDG 10,ROOM 13N 268,BETHESDA,MD 20892. USN,MED RES INST,IMMUNE CELL BIOL PROGRAM,BETHESDA,MD 20889. NCI,EXPTL IMMUNOL BRANCH,BETHESDA,MD 20892. NR 36 TC 19 Z9 19 U1 0 U2 0 PU AMER ASSOC IMMUNOLOGISTS PI BETHESDA PA 9650 ROCKVILLE PIKE, BETHESDA, MD 20814 SN 0022-1767 J9 J IMMUNOL JI J. Immunol. PD JUL 15 PY 1991 VL 147 IS 2 BP 460 EP 465 PG 6 WC Immunology SC Immunology GA FX131 UT WOS:A1991FX13100013 PM 1649219 ER PT J AU WOLTZ, LA JACOBS, VL HOOPER, CF MANCINI, RC AF WOLTZ, LA JACOBS, VL HOOPER, CF MANCINI, RC TI EFFECTS OF ELECTRIC MICROFIELDS ON ARGON DIELECTRONIC SATELLITE SPECTRA IN LASER-PRODUCED PLASMAS SO PHYSICAL REVIEW A LA English DT Article ID LINE-PROFILES AB Theoretical spectral-line profiles have been obtained for dielectronic satellite transitions in heliumlike and lithiumlike argon ions. Particular emphasis has been given to the systematic and self-consistent incorporation of the non-local-thermodynamic-equilibrium autoionizing-level populations, together with the line-broadening effects, which are due to autoionization processes, radiative transitions, electron collisions, and the action of the plasma ion-produced electric microfields. An investigation has been carried out of the effects of the plasma electric microfields on predicted dielectronic satellite line-intensity ratios, and a discussion is presented on the consequences of the electric-microfield effects for the spectroscopic determination of basic physical properties in laser-produced plasmas. C1 NATL INST STAND & TECHNOL,DIV ATOM & PLASMA RADIAT,GAITHERSBURG,MD 20899. USN,RES LAB,DIV CONDENSED MATTER & RADIAT SCI,WASHINGTON,DC 20375. UNIV FLORIDA,DEPT PHYS,GAINESVILLE,FL 32611. NR 13 TC 29 Z9 29 U1 0 U2 2 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1050-2947 J9 PHYS REV A JI Phys. Rev. A PD JUL 15 PY 1991 VL 44 IS 2 BP 1281 EP 1286 DI 10.1103/PhysRevA.44.1281 PG 6 WC Optics; Physics, Atomic, Molecular & Chemical SC Optics; Physics GA FY463 UT WOS:A1991FY46300057 ER PT J AU MASSIDDA, S PICKETT, WE POSTERNAK, M AF MASSIDDA, S PICKETT, WE POSTERNAK, M TI CANIN - SUPPRESSION OF ELECTRONIC INSTABILITY BY INTERCHAIN COUPLING SO PHYSICAL REVIEW B LA English DT Article ID PLANE-WAVE METHOD; INTERLAYER STATES; TRANSPORT-PROPERTIES; SOLID-STATE; BAND-THEORY; SUPERCONDUCTORS; SR2VO4; PREDICTION; GRAPHITE AB CaNiN is a recently discovered compound that interestingly combines one-dimensional (1D) Ni-N chains in an unusual three-dimensional (3D) arrangement. Although the linear chains could be a possible candidate for Peierls instability and, despite the formal d9 configuration of Ni, this compound is found to remain metallic and paramagnetic down to very low temperatures. We present the results of electronic-structure calculations for CaNiN as obtained with the full-potential linearized-augmented-plane-wave method within the local-density approximation. Our results show that the interchain coupling strongly reduces the tendency towards electronic instabilities by introducing clear 2D and 3D features into the electronic structure of this compound. The states at the Fermi level are dominated by dp-pi antibonding states. The dp-sigma antibonding bands, expected to be the highest band of the d-p complex, are depressed in energy by the interaction with conduction states (including states with interstitial character), and cannot be clearly singled out throughout the Brillouin zone. C1 USN,RES LAB,COMPLEX SYST THEORY BRANCH,WASHINGTON,DC 20375. RP MASSIDDA, S (reprint author), PHB ECUBLENS,INST ROMAND RECH NUMER PHYS MAT,CH-1015 LAUSANNE,SWITZERLAND. NR 23 TC 19 Z9 19 U1 0 U2 2 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD JUL 15 PY 1991 VL 44 IS 3 BP 1258 EP 1265 DI 10.1103/PhysRevB.44.1258 PG 8 WC Physics, Condensed Matter SC Physics GA FW105 UT WOS:A1991FW10500041 ER PT J AU GRAY, GC ESCAMILLA, J HYAMS, KC STRUEWING, JP KAPLAN, EL TUPPONCE, AK AF GRAY, GC ESCAMILLA, J HYAMS, KC STRUEWING, JP KAPLAN, EL TUPPONCE, AK TI HYPERENDEMIC STREPTOCOCCUS-PYOGENES INFECTION DESPITE PROPHYLAXIS WITH PENICILLIN-G BENZATHINE SO NEW ENGLAND JOURNAL OF MEDICINE LA English DT Article ID ACUTE RHEUMATIC-FEVER; GROUP-A STREPTOCOCCI; SHOCK-LIKE SYNDROME; UNITED-STATES; TOXIC SHOCK; CARRIER STATE; PHARYNGITIS; RESURGENCE; YOUNG AB Background. In closely confined populations, in which epidemics of Streptococcus pyogenes infection are common, penicillin G benzathine has long been used prophylactically to reduce morbidity from this pathogen. We report on our investigations of the effectiveness of penicillin G benzathine prophylaxis at a military recruit camp. Methods. We prospectively studied the rates of pharyngeal colonization and infection by S. pyogenes among 736 male U.S. Marine Corps recruits from January through March 1989. Throat swabs for culture, clinical data, and questionnaire data were obtained during six examinations at intervals of two weeks. Serum samples obtained before training, after training, and from acutely ill recruits were analyzed with use of an antistreptolysin O microtitration technique. Results. Although 93 percent of the recruits received prophylaxis with two intramuscular injections of 1.2 million units of penicillin G benzathine each (administered 30 to 39 days apart), 33 percent of the recruits were colonized by S. pyogenes, and 42 percent had infection (as defined by a two-dilution increase in the antistreptolysin O titer). Thirty-seven percent of 265 recruits who reported a sore throat and were infected with S. pyogenes did not seek medical attention. The recruits who were allergic to penicillin (7 percent of the total), who received no prophylaxis, were more likely to be colonized; an increased risk of colonization and infection among the nonallergic recruits was associated with the presence of a higher percentage of allergic recruits in the platoon. After the study was completed, all recruits who were allergic to penicillin were prescribed 250 mg of oral erythromycin twice daily (a total daily dose of 500 mg) for 60 days. Subsequently, the average weekly rate of clinically evident S. pyogenes pharyngitis fell by more than 75 percent. Conclusions. If the prevention of S. pyogenes infection is to be effective in closely confined populations such as military recruits, prophylactic antibiotics must be administered to all members of the population. Exempting those who are allergic to penicillin may create a bacterial reservoir from which infection can be transmitted to nonallergic members of the population. C1 USN,ENVIRONM & PREVENT MED UNIT 5,DEPT EPIDEMIOL,SAN DIEGO,CA 92132. USN,ENVIRONM & PREVENT MED UNIT 5,DEPT MICROBIOL,SAN DIEGO,CA 92132. USN,MED RES UNIT,BETHESDA,MD 20814. UNIV MINNESOTA,DEPT PEDIAT,WHO,COLLABORATING CTR REFERENCE & RES STREPTOCOCCI,MINNEAPOLIS,MN 55455. RI Struewing, Jeffery/C-3221-2008; Struewing, Jeffery/I-7502-2013 OI Struewing, Jeffery/0000-0002-4848-3334 NR 46 TC 43 Z9 43 U1 0 U2 0 PU MASS MEDICAL SOC PI BOSTON PA 10 SHATTUCK, BOSTON, MA 02115 SN 0028-4793 J9 NEW ENGL J MED JI N. Engl. J. Med. PD JUL 11 PY 1991 VL 325 IS 2 BP 92 EP 97 DI 10.1056/NEJM199107113250204 PG 6 WC Medicine, General & Internal SC General & Internal Medicine GA FV522 UT WOS:A1991FV52200004 PM 2052057 ER PT J AU WANG, YM SHEELEY, NR AF WANG, YM SHEELEY, NR TI MAGNETIC-FLUX TRANSPORT AND THE SUNS DIPOLE-MOMENT - NEW TWISTS TO THE BABCOCK-LEIGHTON MODEL SO ASTROPHYSICAL JOURNAL LA English DT Article DE SUN, ACTIVITY; SUN, MAGNETIC FIELDS; SUN, ROTATION ID ACTIVE REGIONS; POLAR FIELDS; ROTATION; CYCLE AB We discuss the mechanism for the generation of the Sun's poloidal magnetic field in the general framework of the Babcock-Leighton model. There are two distinct contributions to this process, the first being associated with the axial tilts of bipolar magnetic regions (BMRs) as they erupt at the solar surface, the second arising from the subsequent transport of the erupted flux over the surface. We suggest that the action of Coriolis forces on rising, expanding flux loops can account for both the magnitude and the latitudinal variation of the average BMR tilt angles. After a BMR has erupted, supergranular diffusion and meridional flow acting in combination can cause its axial dipole moment to grow or decay, depending mainly on the BMR's latitude of eruption. For realistic rates of diffusion and flow, the net effect of flux transport over the sunspot cycle is to reduce the Sun's axial dipole below the strength that it would have attained in the absence of any transport. In this sense, the "alpha-effect" in the Babcock-Leighton dynamo is inherent in the axial tilts of the BMRs; the surface transport acts mainly to redistribute the poloidally oriented component of the BMR flux, producing highly concentrated polar fields. We find that ephemeral regions have no effect on the evolution of the Sun's axial dipole moment, nor do they give rise to an effective diffusive transport of flux. Finally, we discuss the relationship between the surface flux and the subsurface toroidal field. RP WANG, YM (reprint author), USN,RES LAB,EO HULBURT CTR SPACE RES,CODE 4172,WASHINGTON,DC 20375, USA. NR 32 TC 192 Z9 192 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 JUL 10 PY 1991 VL 375 IS 2 BP 761 EP 770 DI 10.1086/170240 PN 1 PG 10 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA FV411 UT WOS:A1991FV41100038 ER PT J AU ADAMS, JH GARCIAMUNOZ, M GRIGOROV, NL KLECKER, B KONDRATYEVA, MA MASON, GM MCGUIRE, RE MEWALDT, RA PANASYUK, MI TRETYAKOVA, CA TYLKA, AJ ZHURAVLEV, DA AF ADAMS, JH GARCIAMUNOZ, M GRIGOROV, NL KLECKER, B KONDRATYEVA, MA MASON, GM MCGUIRE, RE MEWALDT, RA PANASYUK, MI TRETYAKOVA, CA TYLKA, AJ ZHURAVLEV, DA TI THE CHARGE STATE OF THE ANOMALOUS COMPONENT OF COSMIC-RAYS SO ASTROPHYSICAL JOURNAL LA English DT Article DE COSMIC RAYS ABUNDANCES; COSMIC RAYS GENERAL ID SOLAR ENERGETIC PARTICLES; OXYGEN AB The ionic charge state of anomalous cosmic-ray oxygen has been determined by comparing measurements obtained inside the magnetosphere on a series of Cosmos satellite flights with simultaneous observations outside the magnetosphere from IMP 8 and ICE. We find a mean charge state of 0.9(-0.2)+0.3 for approximately 10 MeV nucleon-1 anomalous oxygen, consistent with the model of Fisk, Kozlovsky, & Ramaty, in which the anomalous cosmic rays originate from the neutral component of the local interstellar medium. This same approach gives results consistent with a mean charge state of +7 for solar energetic oxygen ions. C1 USN,RES LAB,UNIV SPACE RES ASSOC,WASHINGTON,DC 20375. UNIV CHICAGO,ENRICO FERMI INST,CHICAGO,IL 60637. MV LOMONOSOV STATE UNIV,NUCL PHYS RES INST,MOSCOW 119899,USSR. MAX PLANCK INST PHYS & ASTROPHYS,INST EXTRATERR PHYS,W-8046 GARCHING,GERMANY. UNIV MARYLAND,DEPT PHYS & ASTRON,COLLEGE PK,MD 20742. UNIV MARYLAND,INST PHYS SCI & TECHNOL,COLLEGE PK,MD 20742. NASA,GODDARD SPACE FLIGHT CTR,GREENBELT,MD 20771. CALTECH,DOWNS LAB 220-47,PASADENA,CA 91125. RP ADAMS, JH (reprint author), USN,RES LAB,EO HULBURT CTR SPACE RES,CODE 4154,WASHINGTON,DC 20375, USA. RI Panasyuk, Mikhail/E-2005-2012; Tylka, Allan/G-9592-2014 NR 26 TC 53 Z9 53 U1 0 U2 0 PU UNIV CHICAGO PRESS PI CHICAGO PA 5720 S WOODLAWN AVE, CHICAGO, IL 60637 SN 0004-637X J9 ASTROPHYS J JI Astrophys. J. PD JUL 10 PY 1991 VL 375 IS 2 BP L45 EP L48 DI 10.1086/186084 PN 2 PG 4 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA FV416 UT WOS:A1991FV41600002 ER PT J AU SZPAK, S GABRIEL, CJ SMITH, JJ NOWAK, RJ AF SZPAK, S GABRIEL, CJ SMITH, JJ NOWAK, RJ TI ELECTROCHEMICAL CHARGING OF PD RODS SO JOURNAL OF ELECTROANALYTICAL CHEMISTRY LA English DT Article ID HYDROGEN ABSORPTION; PALLADIUM; METALS; DIFFUSION; DEUTERIUM; KINETICS; SURFACE AB A model describing the electrochemical charging of Pd rods is presented. The essential feature of this model is the coupling of the interfacial processes with the transport of interstitials in the electrode interior. It is shown that boundary conditions arise from the solution of equations governing the elementary adsorption-desorption and adsorption-absorption steps and the symmetry of the electrode. Effects of the choice of rate constants of the elementary steps and the charging current on the surface coverage, the electrode potential and the time required to complete electrode charging are examined. C1 US DOE,WASHINGTON,DC 20545. OFF NAVAL RES,ARLINGTON,VA 22217. RP SZPAK, S (reprint author), USN,CTR OCEAN SYST,SAN DIEGO,CA 92152, USA. NR 28 TC 23 Z9 23 U1 1 U2 3 PU ELSEVIER SCIENCE SA LAUSANNE PI LAUSANNE 1 PA PO BOX 564, 1001 LAUSANNE 1, SWITZERLAND SN 0022-0728 J9 J ELECTROANAL CHEM JI J. Electroanal. Chem. PD JUL 10 PY 1991 VL 309 IS 1-2 BP 273 EP 292 DI 10.1016/0022-0728(91)87019-Z PG 20 WC Chemistry, Analytical; Electrochemistry SC Chemistry; Electrochemistry GA FX823 UT WOS:A1991FX82300019 ER PT J AU VOHRA, ST BUCHOLTZ, F AF VOHRA, ST BUCHOLTZ, F TI LOW-FREQUENCY MAGNETIC-FIELD MIXING NEAR PERIOD DOUBLING BIFURCATION OF A FIBEROPTIC MAGNETOMETER SO APPLIED PHYSICS LETTERS LA English DT Article ID SENSORS AB A magnetically driven magnetostrictive sample, which is used as the sensing element in a fiber-optic magnetometer, is known to exhibit strain bifurcations. Standard techniques for fiber-optic magnetostrictive magnetometers employ demodulation at a carrier frequency omega-c but, typically, the resolution is limited by 1/f noise around omega-c. We present a novel technique for the detection of low-frequency magnetic signals which employs the frequency associated with a period doubling bifurcation omega-c/2, and which avoids upconverted 1/f noise near omega-c. The signal-to-noise ratio of low-frequency magnetic signals near omega-c/2 remains flat in the range 0.025-10 Hz, with a resolution of 5 nT/square-root Hz for a sensor using only 5 mm of fiber, limited by the phase noise of the fiber interferometer. RP VOHRA, ST (reprint author), USN,RES LAB,CODE 6570,WASHINGTON,DC 20375, USA. NR 10 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 0003-6951 J9 APPL PHYS LETT JI Appl. Phys. Lett. PD JUL 8 PY 1991 VL 59 IS 2 BP 169 EP 171 DI 10.1063/1.106009 PG 3 WC Physics, Applied SC Physics GA FV763 UT WOS:A1991FV76300011 ER PT J AU MOGLESTUE, C BUOT, FA ANDERSON, WT AF MOGLESTUE, C BUOT, FA ANDERSON, WT TI MONTE-CARLO PARTICLE SIMULATION OF RADIATION-INDUCED HEATING IN GAAS FIELD-EFFECT TRANSISTORS SO APPLIED PHYSICS LETTERS LA English DT Article AB Exposure of GaAs field-effect transistors to alpha-particle radiation has resulted in burnout paths from under the gate to both the source and the drain. Monte Carlo calculations show that the current response from an alpha-particle penetrating the center of the gate electrode at normal incidence lasts for 60 ps, about five times longer than predicted by previous hydrodynamic modeling. The thermalization of the induced electrons causes a maximum subsurface heating of the epilayer near the source and the drain when both are held at ground with a negative bias on the gate. A possible melting of the semiconductor will take place at these locations. We present here for the first time a more accurate simulation of the actual lattice heating rates obtained from electron-phonon exchanges inside the device. Although the qualitative results support the previous hydrodynamic analysis, some important quantitative differences are noted. C1 USN,RES LAB,WASHINGTON,DC 20375. RP MOGLESTUE, C (reprint author), FRAUNHOFER INST APPL SOLID STATE PHYS,W-7800 FREIBURG,GERMANY. NR 5 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 0003-6951 J9 APPL PHYS LETT JI Appl. Phys. Lett. PD JUL 8 PY 1991 VL 59 IS 2 BP 192 EP 194 DI 10.1063/1.105963 PG 3 WC Physics, Applied SC Physics GA FV763 UT WOS:A1991FV76300019 ER PT J AU CHAIKEN, A LUBITZ, P KREBS, JJ PRINZ, GA HARFORD, MZ AF CHAIKEN, A LUBITZ, P KREBS, JJ PRINZ, GA HARFORD, MZ TI LOW-FIELD SPIN-VALVE MAGNETORESISTANCE IN FE-CU-CO SANDWICHES SO APPLIED PHYSICS LETTERS LA English DT Article ID CR AB Fe-Cu-Co sandwiches have been grown on glass and silicon substrates using electron beam evaporation. Because the typical coercive field of a thin Co film is higher than that of a typical Fe film, the magnetization curves of these sandwiches show clearly the separate, sequential reversal of the Fe and Co moments as a function of applied field. In the applied field region where the moments of the two magnetic layers are antialigned, the spin-valve magnetoresistance shows a peak of over 3% in amplitude at room temperature. RP CHAIKEN, A (reprint author), USN,RES LAB,CODE 6345,WASHINGTON,DC 20375, USA. NR 8 TC 30 Z9 30 U1 0 U2 6 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0003-6951 J9 APPL PHYS LETT JI Appl. Phys. Lett. PD JUL 8 PY 1991 VL 59 IS 2 BP 240 EP 242 DI 10.1063/1.105978 PG 3 WC Physics, Applied SC Physics GA FV763 UT WOS:A1991FV76300035 ER PT J AU GRUN, J STAMPER, J MANKA, C RESNICK, J BURRIS, R RIPIN, BH AF GRUN, J STAMPER, J MANKA, C RESNICK, J BURRIS, R RIPIN, BH TI OBSERVATION OF HIGH-PRESSURE BLAST-WAVE DECURSORS SO APPLIED PHYSICS LETTERS LA English DT Article ID LASER-PRODUCED PLASMAS; CLASSICAL-TRANSPORT REGIME; TEMPERATURE PROFILES; DENSITY; TARGETS; PLANAR AB We observe, for the first time in a laboratory, the formation of decursors at intersections of planar surfaces with powerful blast waves. The blast waves, which have hundreds-kilobar overpressures, are created by rapid ablation of material heated with an intense laser beam. RP GRUN, J (reprint author), USN,RES LAB,DIV PLASMA PHYS,SPACE PLASMA BRANCH,WASHINGTON,DC 20375, USA. NR 15 TC 13 Z9 13 U1 0 U2 0 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0003-6951 J9 APPL PHYS LETT JI Appl. Phys. Lett. PD JUL 8 PY 1991 VL 59 IS 2 BP 246 EP 248 DI 10.1063/1.105980 PG 3 WC Physics, Applied SC Physics GA FV763 UT WOS:A1991FV76300037 ER PT J AU PICKETT, WE COHEN, RE KRAKAUER, H AF PICKETT, WE COHEN, RE KRAKAUER, H TI LATTICE INSTABILITIES, ISOTOPE EFFECT, AND HIGH-TC SUPERCONDUCTIVITY IN LA2-XBAXCUO4 SO PHYSICAL REVIEW LETTERS LA English DT Article ID STRUCTURAL PHASE-TRANSITIONS; LA2CUO4; (LA1-XBAX)2CUO4-DELTA; MODEL AB Unlike La(2-x)Sr(x)CUO4, La(2-x)Ba(x)CUO4, x approximately x(cr) = 0.12, undergoes a structural change to a low-temperature tetragonal (LTT) phase below 60 K, and this transformation is known to suppress T(c) drastically. We present self-consistent local-density-functional calculations for this system that indicate the CUO6 octahedrons are unstable to an X-point tilt in any direction, thereby leading to strongly anharmonic X-point vibrations. The LTT phase is most favored energetically, consistent with experiment. The effect of the LTT distortion on the electronic structure accounts for the suppression of T(c) in the LTT phase, and for the enhanced isotope effect at x = x(cr). C1 USN,RES LAB,COMPLEX SYST THEORY BRANCH,WASHINGTON,DC 20375. CARNEGIE INST WASHINGTON,GEOPHYS LAB,WASHINGTON,DC 20015. COLL WILLIAM & MARY,DEPT PHYS,WILLIAMSBURG,VA 23185. RP PICKETT, WE (reprint author), UNIV CAMBRIDGE,CAVENDISH LAB,DEPT PHYS,CAMBRIDGE CB3 0HE,ENGLAND. RI Cohen, Ronald/B-3784-2010; OI Cohen, Ronald/0000-0001-5871-2359; Krakauer, Henry/0000-0003-2517-0957 NR 34 TC 147 Z9 147 U1 0 U2 5 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0031-9007 J9 PHYS REV LETT JI Phys. Rev. Lett. PD JUL 8 PY 1991 VL 67 IS 2 BP 228 EP 231 DI 10.1103/PhysRevLett.67.228 PG 4 WC Physics, Multidisciplinary SC Physics GA FV182 UT WOS:A1991FV18200018 ER PT J AU GOODMAN, IR NGUYEN, HT AF GOODMAN, IR NGUYEN, HT TI FOUNDATIONS FOR AN ALGEBRAIC-THEORY OF CONDITIONING SO FUZZY SETS AND SYSTEMS LA English DT Article DE BOOLEAN RINGS; CONDITIONAL OBJECTS; CONDITIONAL PROBABILITY; COSETS; LOGICAL IMPLICATION; VONNEUMANN REGULAR RINGS AB We investigate some mathematical results in ring theory in order to lay down an algebraic framework for a theory of measure-free conditional objects. C1 NEW MEXICO STATE UNIV,DEPT MATH SCI,LAS CRUCES,NM 88003. HARVARD UNIV,DEPT STAT,CAMBRIDGE,MA 02138. RP GOODMAN, IR (reprint author), USN,CTR OCEAN SYST,DEPT COMMAND & CONTROL,SAN DIEGO,CA 92152, USA. NR 15 TC 1 Z9 1 U1 0 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0165-0114 J9 FUZZY SET SYST JI Fuzzy Sets Syst. PD JUL 5 PY 1991 VL 42 IS 1 BP 103 EP 117 DI 10.1016/0165-0114(91)90092-5 PG 15 WC Computer Science, Theory & Methods; Mathematics, Applied; Statistics & Probability SC Computer Science; Mathematics GA FX322 UT WOS:A1991FX32200009 ER PT J AU RUDOLPH, AS RATNA, BR KAHN, B AF RUDOLPH, AS RATNA, BR KAHN, B TI SELF-ASSEMBLING PHOSPHOLIPID FILAMENTS SO NATURE LA English DT Article ID MEMBRANES; FLUCTUATIONS; SHAPES AB AQUEOUS dispersions of double-chain phospholipids spontaneously assemble into closed bilayers called vesicles (or liposomes). Although the vesicles are in general topologically spherical, cylindrical 1 and helical 2 liposomes have sometimes been observed. We present here video-enhanced microscopic studies of a diacetylenic phospholipid dispersed in ethanol/water, which reveal the existence of unusual bilayer morphologies. On cooling the dispersion from the isotropic phase, we have observed the formation of long (of the order of hundreds of micrometres), thin (0.2-2-mu-m) filaments, which fluctuate strongly. When the temperature is decreased further, the filaments rapidly retract into a mass of lipid. At constant temperature, on the other hand, the filaments transform into torus or ring-like vesicles. Such nonspherical structures have been predicted theoretically 3,4 but not previously observed experimentally. C1 GEORGETOWN UNIV,MED CTR,DEPT BIOCHEM,WASHINGTON,DC 20007. GEOCENTERS INC,FT WASHINGTON,MD 20744. RP RUDOLPH, AS (reprint author), USN,RES LAB,CTR BIOMOLEC SCI & ENGN,CODE 6090,WASHINGTON,DC 20375, USA. NR 16 TC 36 Z9 37 U1 0 U2 8 PU MACMILLAN MAGAZINES LTD PI LONDON PA 4 LITTLE ESSEX STREET, LONDON, ENGLAND WC2R 3LF SN 0028-0836 J9 NATURE JI Nature PD JUL 4 PY 1991 VL 352 IS 6330 BP 52 EP 55 DI 10.1038/352052a0 PG 4 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA FV178 UT WOS:A1991FV17800066 PM 2062377 ER PT J AU KIM, JH TAKAHASHI, T CHIBA, I PARK, JG BIRRER, MJ ROH, JK LEE, HD KIM, JP MINNA, JD GAZDAR, AF AF KIM, JH TAKAHASHI, T CHIBA, I PARK, JG BIRRER, MJ ROH, JK LEE, HD KIM, JP MINNA, JD GAZDAR, AF TI OCCURRENCE OF P53-GENE ABNORMALITIES IN GASTRIC-CARCINOMA TUMORS AND CELL-LINES SO JOURNAL OF THE NATIONAL CANCER INSTITUTE LA English DT Article ID HUMAN COLORECTAL-CARCINOMA; P53 GENE-MUTATIONS; WILD-TYPE P53; LUNG-CANCER; POINT MUTATIONS; BLAST CRISIS; DNA; EXPRESSION; SEQUENCE; REARRANGEMENT AB We explored the state of the p53 gene in gastric cancer. Using one or more methods, we examined 15 specimens from primary carcinomas (14 tumors, one cell line), five cell lines derived from metastases, and seven paired samples of nonmalignant gastric mucosa. Sequence analyses of complementary DNA containing the entire p53 gene open reading frame demonstrated abnormalities in one of five samples from metastases. The single cell line derived from a primary carcinoma had no abnormality of the gene. The six abnormalities included four point mutations, one base-pair deletion resulting in a frame shift, and a 24 base-pair deletion caused by an intronic point mutation (as determined by sequence analysis of genomic DNA). Four of the six mutations mapped to regions highly conserved among species or involved in simian virus 40 T-antigen binding. Restriction fragment length polymorphism studies confirmed that chromosome 17p allelic deletions occur only in a minority of primary tumors, but that they may occur more frequently in metastases. Northern blotting and ribonuclease protection assays detected only a fraction of the p53 gene abnormalities detected by sequencing. Our findings indicate that mutations of the p53 gene are relatively rare in primary gastric tumors but appear to be relatively frequent in cell lines derived from metastatic lesions. Our results may help in understanding the molecular events associated with progression and metastasis in gastric carcinoma. C1 USN HOSP,NCI,DIV CANC TREATMENT,MED ONCOL BRANCH,BLDG 8,RM 5101,BETHESDA,MD 20814. RI Park, Jae-Gahb/J-5494-2012; Takahashi, Takashi/I-7262-2014 NR 35 TC 133 Z9 133 U1 0 U2 0 PU NATL CANCER INSTITUTE PI BETHESDA PA 9030 OLD GEORGETOWN RD, BETHESDA, MD 20814 SN 0027-8874 J9 J NATL CANCER I JI J. Natl. Cancer Inst. PD JUL 3 PY 1991 VL 83 IS 13 BP 938 EP 943 DI 10.1093/jnci/83.13.938 PG 6 WC Oncology SC Oncology GA FU294 UT WOS:A1991FU29400018 PM 1676761 ER PT J AU CORWIN, AL OLSON, JG OMAR, MA RAZAKI, A WATTS, DM AF CORWIN, AL OLSON, JG OMAR, MA RAZAKI, A WATTS, DM TI HIV-1 IN SOMALIA - PREVALENCE AND KNOWLEDGE AMONG PROSTITUTES SO AIDS LA English DT Letter ID INFECTION C1 MINIST HLTH,SEXUALLY TRANSMITTED DIS PROJECT,MUQDISHO,SOMALIA. RP CORWIN, AL (reprint author), USN,MED RES UNIT 3,CAIRO,EGYPT. NR 5 TC 12 Z9 13 U1 1 U2 1 PU RAPID SCIENCE PUBLISHERS PI LONDON PA 2-6 BOUNDARY ROW, LONDON, ENGLAND SE1 8NH SN 0269-9370 J9 AIDS JI Aids PD JUL PY 1991 VL 5 IS 7 BP 902 EP 904 DI 10.1097/00002030-199107000-00023 PG 3 WC Immunology; Infectious Diseases; Virology SC Immunology; Infectious Diseases; Virology GA FX264 UT WOS:A1991FX26400023 PM 1892603 ER PT J AU GARLAND, CF GARLAND, FC GORHAM, ED AF GARLAND, CF GARLAND, FC GORHAM, ED TI CAN COLON CANCER INCIDENCE AND DEATH RATES BE REDUCED WITH CALCIUM AND VITAMIN-D SO AMERICAN JOURNAL OF CLINICAL NUTRITION LA English DT Article; Proceedings Paper CT SYMP ON AN UPDATE ON CALCIUM : APPLICATIONS FOR THE 90S CY JAN 21-23, 1990 CL CHANTILLY, VA SP SMITHKLINE BEECHAM CONSUMER BRANDS DE COLONIC NEOPLASMS; CALCIUM; VITAMIN-D; 25-HYDROXYCHOLECALCIFEROL; 1,25-DIHYDROXYCHOLECALCIFEROL; COHORT STUDIES; CASE-CONTROL STUDIES ID CAUSES 1,25-DIHYDROXYCHOLECALCIFEROL DEFICIENCY; EPITHELIAL-CELL PROLIFERATION; EMPHASIZING TRACE MINERALS; DIETARY CALCIUM; COLORECTAL-CANCER; NUTRITIONAL-STATUS; GROWTH-CHARACTERISTICS; SERUM CONCENTRATIONS; ELDERLY POPULATION; SEASONAL-VARIATION AB It was proposed in 1980 that vitamin D and calcium could reduce the risk of colon cancer. This assertion was based on the decreasing gradient of mortality rates from north to south, suggesting a mechanism related to a favorable influence of ultraviolet-induced vitamin D metabolites on metabolism of calcium. A 19-y prospective study of 1954 Chicago men found that a dietary intake of > 3.75-mu-g vitamin D/d was associated with a 50% reduction in the incidence of colorectal cancer, whereas an intake of greater-than-or-equal-to 1200 mg Ca/d was associated with a 75% reduction. Clinical and laboratory studies further support these findings. A nested case-control study based on serum drawn from a cohort of 25 620 individuals reported that moderately elevated concentrations of 25-hydroxyvitamin D, in the range 65-100 nmol/L, were associated with large reductions (P < 0.05) in the incidence of colorectal cancer. C1 USN,HLTH RES CTR,SAN DIEGO,CA 92152. RP GARLAND, CF (reprint author), UNIV CALIF SAN DIEGO,DEPT COMMUNITY & FAMILY MED,M-007,LA JOLLA,CA 92093, USA. FU NCI NIH HHS [CA 23100-10] NR 94 TC 71 Z9 71 U1 0 U2 2 PU AMER SOC CLIN NUTRITION INC PI BETHESDA PA 9650 ROCKVILLE PIKE SUBSCRIPTIONS, RM L-2310, BETHESDA, MD 20814-3998 SN 0002-9165 J9 AM J CLIN NUTR JI Am. J. Clin. Nutr. PD JUL PY 1991 VL 54 IS 1 SU S BP S193 EP S201 PG 9 WC Nutrition & Dietetics SC Nutrition & Dietetics GA FV935 UT WOS:A1991FV93500005 PM 2053561 ER PT J AU COTELINGAM, JD AF COTELINGAM, JD TI PHENOTYPE OF ATYPICAL CD30-POSITIVE CELLS IN INFECTIOUS-MONONUCLEOSIS - REPLY SO AMERICAN JOURNAL OF CLINICAL PATHOLOGY LA English DT Letter RP COTELINGAM, JD (reprint author), UNIFORMED SERV UNIV HLTH SCI,USN,MED CORPS,BETHESDA,MD 20814, USA. NR 1 TC 0 Z9 0 U1 0 U2 0 PU LIPPINCOTT-RAVEN PUBL PI PHILADELPHIA PA 227 EAST WASHINGTON SQ, PHILADELPHIA, PA 19106 SN 0002-9173 J9 AM J CLIN PATHOL JI Am. J. Clin. Pathol. PD JUL PY 1991 VL 96 IS 1 BP 146 EP 146 PG 1 WC Pathology SC Pathology GA FV539 UT WOS:A1991FV53900028 ER PT J AU SCHWARTZ, BS FORD, DP CHILDS, JE ROTHMAN, N THOMAS, RJ AF SCHWARTZ, BS FORD, DP CHILDS, JE ROTHMAN, N THOMAS, RJ TI ANTITICK SALIVA ANTIBODY - A BIOLOGIC MARKER OF TICK EXPOSURE THAT IS A RISK FACTOR FOR LIME DISEASE SEROPOSITIVITY SO AMERICAN JOURNAL OF EPIDEMIOLOGY LA English DT Article DE ANTIBODIES; BIOLOGICAL MARKERS; BORRELIA; DIAGNOSTIC TESTS, ROUTINE; LYME DISEASE; RISK FACTORS; TICKS ID IXODES-DAMMINI; LYME-DISEASE; IMMUNE-RESPONSES; COMPONENTS; GLAND AB Anti-tick saliva antibody (ATSA) has potential as a biologic marker of exposure to tick bites. In 1989, we conducted a cross-sectional study of 304 outdoor workers in Monmouth County, New Jersey, to evaluate associations between self-reported tick exposure, ATSA status, and Lyme disease antibody status. ATSA levels 1) were correlated with an index of tick exposure on the basis of three self-reported measures of tick exposure and outdoor hours worked per week (p = 0.01); 2) were consistently higher in pet owners compared with persons without pets (p = 0.03); and 3) when examined by duration since last tick bite, peaked at 3-5 weeks after tick bite and then declined (p = 0.06). ATSA levels dichotomized at the 75th percentile (approximately two standard deviations above the mean ATSA optical density of 25 subjects who denied recent tick exposure) were associated with self-reported tick exposure: adjusted odds ratios for high ATSA levels were 4.2 (95% confidence interval (CI) 0.9-18.9) for moderate (versus none) tick exposure and 5.8 (95% CI 1.2-27.2) for high (versus none) tick exposure. Finally, high ATSA levels were associated with Lyme disease seropositivity, with an adjusted odds ratio of 3.2 (95% CI 1.3-7.6). The data suggest that ATSA is a biologic marker of tick exposure that is a risk factor for Lyme disease seropositivity. C1 PHILADELPHIA NAVAL HOSP,PHILADELPHIA,PA. JOHNS HOPKINS UNIV,SCH HYG & PUBL HLTH,DEPT IMMUNOL & INFECT DIS,BALTIMORE,MD 21218. JOHNS HOPKINS UNIV,SCH HYG & PUBL HLTH,DEPT EPIDEMIOL,BALTIMORE,MD 21218. USN,CTR ENVIRONM HLTH,DEPT OCCUPAT MED,NORFOLK,VA 23511. RP SCHWARTZ, BS (reprint author), JOHNS HOPKINS UNIV,SCH HYG & PUBL HLTH,DEPT ENVIRONM HLTH SCI,DIV OCCUPAT HLTH,615 N WOLFE ST,BALTIMORE,MD 21205, USA. RI Childs, James/B-4002-2012 NR 24 TC 52 Z9 52 U1 0 U2 4 PU AMER J EPIDEMIOLOGY PI BALTIMORE PA 624 N BROADWAY RM 225, BALTIMORE, MD 21205 SN 0002-9262 J9 AM J EPIDEMIOL JI Am. J. Epidemiol. PD JUL 1 PY 1991 VL 134 IS 1 BP 86 EP 95 PG 10 WC Public, Environmental & Occupational Health SC Public, Environmental & Occupational Health GA FX669 UT WOS:A1991FX66900010 PM 1853864 ER PT J AU HAGAN, RD PARRISH, G LICCIARDONE, JC AF HAGAN, RD PARRISH, G LICCIARDONE, JC TI PHYSICAL-FITNESS IS INVERSELY RELATED TO HEART-DISEASE RISK - A FACTOR ANALYTIC STUDY SO AMERICAN JOURNAL OF PREVENTIVE MEDICINE LA English DT Article AB We measured cardiorespiratory endurance, muscular strength and endurance, anaerobic run time, coronary risk factors, and dietary habits in male fire fighters (n = 779, ages 18 to 64 years) and performed factor analysis to determine the interrelationships and underlying factor structure of the data set. Principal component analysis produced nine factors (eigenvalues > 1.0) accounting for 61% of the total variance. However, the variable loadings were inconsistent, preventing a meaningful interpretation of the factor solution. These problems were solved through the principal axis method of common factor analysis, which revealed three factors (eigenvalues > 1.0) accounting for 29% of the total variance. Orthogonal rotation (varimax method), showed Factors 1, 2, and 3 accouting for 52%, 29%, and 19%, respectively, of the common variance. Factor 1, labeled physical fitness capacity (PFC), included age, situps, treadmill performance time, pushups, maximum exercise heart rate, and anaerobic run time. Factor 2, designated coronary risk status (CRS), included body mass index, resting systolic and diastolic blood pressure, triglycerides, and the total cholesterol-high density lipoprotein cholesterol ratio. Factor 3, termed food frequency intake (FFI), included the weekly intake of fried foods, beef, pork, eggs, caffeine, and cheese. Percentage body fat loaded on both PFC and CRS. Measures such as blood pressure, grip strength, resting heart rate, maximum exercise systolic blood pressure, cigarettes smoked per day, and weekly frequency of milk, fish, fowl, and alcohol intake contributed little to the factor solution. Correlation coefficients after oblique rotation showed PFC to be inversely related to CRS (r = -0.48). However, FFI was independent of PFC (r = 0.07) and CRS (r = -0.10). Our findings reveal for the first time an inverse relationship between measures of physical fitness (aerobic and anaerobic capacity; muscular strength and endurance) and risk factors for coronary heart disease. RP HAGAN, RD (reprint author), USN,HLTH RES CTR,POB 85122 CODE 21,SAN DIEGO,CA 92186, USA. NR 0 TC 6 Z9 6 U1 1 U2 6 PU OXFORD UNIV PRESS INC PI CARY PA JOURNALS DEPT, 2001 EVANS RD, CARY, NC 27513 SN 0749-3797 J9 AM J PREV MED JI Am. J. Prev. Med. PD JUL-AUG PY 1991 VL 7 IS 4 BP 237 EP 243 PG 7 WC Public, Environmental & Occupational Health; Medicine, General & Internal SC Public, Environmental & Occupational Health; General & Internal Medicine GA HG425 UT WOS:A1991HG42500010 PM 1756061 ER PT J AU BAIRD, JK JONES, TR DANUDIRGO, EW ANNIS, BA BANGS, MJ BASRI, H MASBAR, S AF BAIRD, JK JONES, TR DANUDIRGO, EW ANNIS, BA BANGS, MJ BASRI, H MASBAR, S TI AGE-DEPENDENT ACQUIRED PROTECTION AGAINST PLASMODIUM-FALCIPARUM IN PEOPLE HAVING 2 YEARS EXPOSURE TO HYPERENDEMIC MALARIA SO AMERICAN JOURNAL OF TROPICAL MEDICINE AND HYGIENE LA English DT Article ID MOSQUITOS AB An epidemiologic study of susceptibility to frequent and high-grade parasitemia by Plasmodium falciparum revealed that age-dependent acquired protection developed within a two-year period of exposure to hyperendemic infection pressure. The study was conducted in a single village in northeastern Irian Jaya, Indonesia, where half the residents were native to the province and the other half were transmigrants from areas of Java, where there is little or no malaria transmission. Five separate measures of susceptibility to the asexual parasitemia of falciparum malaria were derived from results of four months of biweekly surveillance of 240 volunteers. Increasing protection as a function of age among the Javanese was a consistent pattern among the five estimates of susceptibility. These age-dependent functions of protection were quantitatively parallel to those among life-long residents of Irian Jaya. When humoral immune responsiveness to ring-infected erythrocyte surface antigen (RESA) was measured by ELISA, a similar pattern emerged; the relative level of antibody to RESA increased as parallel functions of age among the two subpopulations. Acquired protective immunity against P. falciparum was not the cumulative product of many years of heavy exposure to antigen. Instead, the full benefit of protection appeared to develop quickly. The degree of protection was governed by recent exposure and age, independent of history of chronic heavy exposure. C1 USN, MED RES INST, MALARIA PROGRAM, BETHESDA, MD 20814 USA. CENT HLTH CLIN, IRIAN JAYA, INDONESIA. USN, MED RES UNIT 2, JAKARTA, INDONESIA. NR 20 TC 117 Z9 121 U1 1 U2 3 PU AMER SOC TROP MED & HYGIENE PI MCLEAN PA 8000 WESTPARK DR, STE 130, MCLEAN, VA 22101 USA SN 0002-9637 J9 AM J TROP MED HYG JI Am. J. Trop. Med. Hyg. PD JUL PY 1991 VL 45 IS 1 BP 65 EP 76 PG 12 WC Public, Environmental & Occupational Health; Tropical Medicine SC Public, Environmental & Occupational Health; Tropical Medicine GA GC824 UT WOS:A1991GC82400005 PM 1867349 ER PT J AU SALES, JH KENNEDY, KS GALANTICH, PT GOMEZ, PJ AF SALES, JH KENNEDY, KS GALANTICH, PT GOMEZ, PJ TI TOXIC SHOCK SYNDROME ASSOCIATED WITH PHARYNGITIS AND SUBMANDIBULAR SPACE ABSCESS SO ANNALS OF OTOLOGY RHINOLOGY AND LARYNGOLOGY LA English DT Article DE STAPHYLOCOCCAL PHARYNGITIS; SUBMANDIBULAR SPACE ABSCESS; TOXIC SHOCK SYNDROME ID MANIFESTATIONS AB Toxic shock syndrome continues to be encountered more frequently with the head and neck areas as sources of the toxin. In head and neck surgery practice it is most commonly noted following nasal packing. An unusual case associated with staphylococcal pharyngitis and spontaneous submandibular space abscess is reported and the literature concerning the subject is reviewed. Treatment is eradication of the infective focus, aggressive support of vital functions, and parenteral antistaphylococcal antibiotics. C1 USN HOSP,DEPT OTOLARYNGOL HEAD & NECK SURG,PORTSMOUTH,VA 23708. EASTERN VIRGINIA MED SCH,DEPT OTOLARYNGOL HEAD & NECK SURG,NORFOLK,VA 23501. UNIFORMED SERV UNIV HLTH SCI,F EDWARD HEBERT SCH MED,DEPT SURG,BETHESDA,MD 20814. NR 9 TC 1 Z9 2 U1 0 U2 0 PU ANNALS PUBL CO PI ST LOUIS PA 4507 LACLEDE AVE, ST LOUIS, MO 63108 SN 0003-4894 J9 ANN OTO RHINOL LARYN JI Ann. Otol. Rhinol. Laryngol. PD JUL PY 1991 VL 100 IS 7 BP 540 EP 543 PG 4 WC Otorhinolaryngology SC Otorhinolaryngology GA FV545 UT WOS:A1991FV54500004 PM 2064264 ER PT J AU LOCKHART, R PARKER, GS TAMI, TA AF LOCKHART, R PARKER, GS TAMI, TA TI ROLE OF QUINSY TONSILLECTOMY IN THE MANAGEMENT OF PERITONSILLAR ABSCESS SO ANNALS OF OTOLOGY RHINOLOGY AND LARYNGOLOGY LA English DT Article DE PERITONSILLAR ABSCESS; TONSILLECTOMY; TONSILLITIS AB Peritonsillar abscess (PTA) is the most frequent complication of acute tonsillitis requiring surgical intervention. Debate continues concerning optimal therapy in terms of patient morbidity and cost-effectiveness. A retrospective study was performed on 45 tonsillectomies for PTA in military personnel from December 1986 through December 1988. Twenty-three quinsy (abscess) tonsillectomies and 22 interval tonsillectomies were identified. Parameters studied were age, sex, abscess location, interval prior to operation, blood loss, operative time, operative experience, and combined hospital and convalescent days for the two groups. Significant differences were noted between the quinsy and interval tonsillectomy groups concerning the average number of days hospitalized (3.0 versus 4.5) and their respective convalescent periods (10.3 versus 17.3). We conclude that quinsy tonsillectomy is the best management for PTA in a young work force when the optimal treatment choice is between interval or acute tonsillectomy. C1 USN HOSP,DEPT OTOLARYNGOL HEAD & NECK SURG,PORTSMOUTH,VA 23708. UNIV CALIF SAN FRANCISCO,DEPT OTOLARYNGOL HEAD & NECK SURG,SAN FRANCISCO,CA 94143. NR 16 TC 21 Z9 21 U1 0 U2 0 PU ANNALS PUBL CO PI ST LOUIS PA 4507 LACLEDE AVE, ST LOUIS, MO 63108 SN 0003-4894 J9 ANN OTO RHINOL LARYN JI Ann. Otol. Rhinol. Laryngol. PD JUL PY 1991 VL 100 IS 7 BP 569 EP 571 PG 3 WC Otorhinolaryngology SC Otorhinolaryngology GA FV545 UT WOS:A1991FV54500009 PM 2064269 ER PT J AU DUMAS, HS ELLISON, JA SAENZ, AW AF DUMAS, HS ELLISON, JA SAENZ, AW TI AXIAL CHANNELING IN PERFECT CRYSTALS, THE CONTINUUM MODEL, AND THE METHOD OF AVERAGING SO ANNALS OF PHYSICS LA English DT Article ID SYSTEMS C1 UNIV NEW MEXICO,DEPT MATH,ALBUQUERQUE,NM 87131. USN,RES LAB,WASHINGTON,DC 20375. CATHOLIC UNIV AMER,DEPT PHYS,WASHINGTON,DC 20064. RP DUMAS, HS (reprint author), UNIV MINNESOTA,INST MATH & APPLICAT,MINNEAPOLIS,MN 55455, USA. NR 40 TC 7 Z9 7 U1 0 U2 0 PU ACADEMIC PRESS INC JNL-COMP SUBSCRIPTIONS PI SAN DIEGO PA 525 B ST, STE 1900, SAN DIEGO, CA 92101-4495 SN 0003-4916 J9 ANN PHYS-NEW YORK JI Ann. Phys. PD JUL PY 1991 VL 209 IS 1 BP 97 EP 123 DI 10.1016/0003-4916(91)90356-D PG 27 WC Physics, Multidisciplinary SC Physics GA FT819 UT WOS:A1991FT81900004 ER PT J AU SEELY, JF HUNTER, WR AF SEELY, JF HUNTER, WR TI THIN-FILM INTERFERENCE OPTICS FOR IMAGING THE O-II-834-A AIRGLOW SO APPLIED OPTICS LA English DT Article ID EXTREME-ULTRAVIOLET; DAYGLOW; MGF2; MAGNETOSPHERE; SPECTROSCOPY; TRANSMISSION; RESOLUTION; EMISSION; SPECTRUM; ALUMINUM AB Normal incidence thin film interference mirrors and filters have been designed to image the O II 834-angstrom airglow. It is shown that MgF2 is a useful spacer material for this wavelength region. The mirrors consist of thin layers of MgF2 in combination with other materials that are chosen to reflect efficiently in a narrow band centered at 834 angstrom. Peak reflectance of 60% can be obtained with a passband 200 angstrom wide. Al/MgF2/Si and Al/MgF2/SiC interference coatings have been designed to reflect 834 angstrom and to absorbe the intense H I 1216 angstrom airglow. An In/MgF2/In interference filter is designed to transmit 834 angstrom and attenuate 1216 angstrom radiation. Interference photocathode coatings for rejecting 1216 angstrom radiation are also discussed. C1 SFA INC,LANDOVER,MD 20785. RP SEELY, JF (reprint author), USN,RES LAB,EO HULBURT CTR SPACE RES,WASHINGTON,DC 20375, USA. NR 43 TC 10 Z9 10 U1 0 U2 3 PU OPTICAL SOC AMER PI WASHINGTON PA 2010 MASSACHUSETTS AVE NW, WASHINGTON, DC 20036 SN 0003-6935 J9 APPL OPTICS JI Appl. Optics PD JUL 1 PY 1991 VL 30 IS 19 BP 2788 EP 2794 PG 7 WC Optics SC Optics GA FU391 UT WOS:A1991FU39100020 PM 20700276 ER PT J AU JEWELL, JM WILLIAMS, GM JAGANATHAN, J AGGARWAL, ID GREASON, P AF JEWELL, JM WILLIAMS, GM JAGANATHAN, J AGGARWAL, ID GREASON, P TI SEPARATION OF INTRINSIC AND EXTRINSIC OPTICAL-ABSORPTION IN A FLUORIDE GLASS SO APPLIED PHYSICS LETTERS LA English DT Article ID LASER CALORIMETRY; METAL AB The contribution of impurity ions to the total optical absorption of a heavy metal fluoride glass has been determined at 532 and 1064 nm. Four ZrF4-BaF2-LaF3-AlF3-NaF glasses were prepared from various purity raw materials. The absorption coefficients of these glasses range from 0.92 to 45.4 x 10(-4) cm-1 at 1064 nm and from 7.43 to 11.1 X 10(-4) cm-1 at 532 nm as determined by laser calorimetry. The concentrations of Fe, Ni, Cu, and Co ions in each glass were determined by graphite furnace atomic absorption spectroscopy. These two measurements enable the absorption, due to transition metal ions to be differentiated from the intrinsic absorption of the glass. At 1064 nm, the absorption coefficient of these glasses is controlled entirely by the transition metal ion content. However, at 532 nm, the absorption by the transition metal ions accounts for 4-42% of the total absorption depending on impurity concentration. The intrinsic absorption of this fluoride glass calculated from these data at 532 nm is (7.69 +/- 0.99) X 10(-4) cm-1. C1 UNIV DAYTON,UDRI,DAYTON,OH 45469. VIRGINIA POLYTECH INST & STATE UNIV,BLACKSBURG,VA 24061. GEOCENTERS INC,FT WASHINGTON,MD 20744. RP JEWELL, JM (reprint author), USN,RES LAB,DIV OPT SCI,OPT MAT RES GRP,CODE 6505,WASHINGTON,DC 20375, USA. NR 15 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 0003-6951 J9 APPL PHYS LETT JI Appl. Phys. Lett. PD JUL 1 PY 1991 VL 59 IS 1 BP 1 EP 3 DI 10.1063/1.105564 PG 3 WC Physics, Applied SC Physics GA FU344 UT WOS:A1991FU34400001 ER PT J AU ELIAS, NM STRUBLE, MF AF ELIAS, NM STRUBLE, MF TI DISCOVERY OF 2 RADIO GALAXIES IN THE ZWICKY CLUSTER 1437.3+6436 SO ASTRONOMICAL JOURNAL LA English DT Article ID ABELL CLUSTERS; INTERFEROMETER OBSERVATIONS AB Two radio galaxies were serendipitously discovered in the Zwicky Cluster 1437.3 + 6436. One radio galaxy is a resolved point source. The other radio galaxy consists of jets that extend from a resolved core and eventually reach a large region of extended emission in a direction away from the cluster center. From the Palomar Observatory Sky Survey prints, we find that the optical counterparts of these radio sources are elliptical galaxies. The radio and optical properties of these galaxies are consistent with those of galaxies in other clusters. C1 UNIV PENN,FLOWER & COOK OBSERV,PHILADELPHIA,PA 19104. USN OBSERV,DEPT ASTROMETRY,WASHINGTON,DC 20392. GE,DIV AEROSP,PHILADELPHIA,PA 19101. RP ELIAS, NM (reprint author), UNIV PENN,DEPT ASTRON & ASTROPHYS,209 S 33RD ST,PHILADELPHIA,PA 19104, USA. NR 23 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 0004-6256 J9 ASTRON J JI Astron. J. PD JUL PY 1991 VL 102 IS 1 BP 30 EP 33 DI 10.1086/115855 PG 4 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA FT833 UT WOS:A1991FT83300003 ER PT J AU STONE, RC AF STONE, RC TI THE SPACE FREQUENCY AND ORIGIN OF THE RUNAWAY O AND B STARS SO ASTRONOMICAL JOURNAL LA English DT Article ID X-RAY BINARIES; OLD NEUTRON STAR; CLOSE BINARY; ROTATIONAL PROPERTIES; POSSIBLE REACTIVATION; INITIAL BINARIES; MASSIVE STARS; CENTAURUS X-3; HIGH-VELOCITY; SEARCH AB Determinations of space frequency for runaway O and B stars are in very poor agreement, and many possible sources of systematic errors have been put forward. This paper investigates these sources, as well as others, and presents means for determining unbiased (true) space frequencies. When corrected for major sources of systematic error, space frequency determinations for the runaway O stars are in very good agreement but less so for the B-type runaways. The true space frequencies of runaway O and B stars are, respectively, 46% and 4% as discussed in this paper. The former value is very supportive, along with other arguments presented in this paper, for runaway O stars being produced from supernova explosions in massive binaries. The origin of the B-type runaways is less clear. RP STONE, RC (reprint author), USN OBSERV,FLAGSTAFF STN,POB 1149,FLAGSTAFF,AZ 86002, USA. NR 88 TC 90 Z9 90 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 JUL PY 1991 VL 102 IS 1 BP 333 EP 349 DI 10.1086/115880 PG 17 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA FT833 UT WOS:A1991FT83300028 ER PT J AU NEMIROFF, RJ AF NEMIROFF, RJ TI PROBING GALACTIC HALO DARK MATTER WITH MICROLENSING SO ASTRONOMY & ASTROPHYSICS LA English DT Article DE GALAXY (THE), HALO OF; GRAVITATION; RELATIVITY; STARS, BINARIES, GENERAL; DARK MATTER ID GRAVITATIONALLY LENSED QSO; BL-LAC OBJECT AB A revised estimate of the probability of microlensing of resolved stars by compact objects with low stellar masses in the Galactic halo is presented using the detection volume formalism (Nemiroff 1989), and computed as a function of lens mass, source amplification, Galactic rotation speed, and extent of the Galactic halo. The probability of lensing at any specific time is calculated and shown to be a weak function of both the extent of the Galactic halo and the mass of the stellar object but proportional to the amplitude of lensing at large amplitude (for A greater-than-or-equal-to 2.5). The detection volume formalism is then extended to include relative lens motion. The probable waiting time between observable events is computed and also found to be a weak function of the extent of the Galactic halo but a strong function of the lens mass and source amplification. Practically observable events of microlensing of stars in the Large Magellanic Clouds are detectable for a Milky Way halo composed of objects with mass between 10(-8) M. and 1 M.. The effects of multiple star lenses and sources are discussed. RP NEMIROFF, RJ (reprint author), USN, RES LAB, EO HULBURT CTR SPACE RES, CODE 4121, 4555 OVERLOOK AVE, WASHINGTON, DC 20375 USA. NR 19 TC 13 Z9 13 U1 0 U2 0 PU EDP SCIENCES S A PI LES ULIS CEDEX A PA 17, AVE DU HOGGAR, PA COURTABOEUF, BP 112, F-91944 LES ULIS CEDEX A, FRANCE SN 0004-6361 J9 ASTRON ASTROPHYS JI Astron. Astrophys. PD JUL PY 1991 VL 247 IS 1 BP 73 EP 76 PG 4 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA FX453 UT WOS:A1991FX45300018 ER PT J AU HARRIS, MJ LEISING, MD SHARE, GH AF HARRIS, MJ LEISING, MD SHARE, GH TI A SEARCH FOR THE 478-KEV LINE FROM THE DECAY OF NUCLEOSYNTHETIC BE-7 SO ASTROPHYSICAL JOURNAL LA English DT Article DE GAMMA-RAYS, GENERAL; NUCLEOSYNTHESIS; STARS, NOVAE ID NOVA-AQUILAE 1982; RADIATION; AL-26 AB Unstable Be-7 (half-life 53.28 days) is expected to be present in the ejecta of classical novae. If the frequency of novae in the central Galaxy is high enough, a nearly steady state abundance of Be-7 will be present there. Data accumulated during transits of the Galactic center across the aperture of the Solar Maximum Mission Gamma Ray Spectrometer have been searched for evidence of the 478 keV gamma-ray line resulting from Be-7 decay. A 3 sigma upper limit of 1.6 x 10(-4) gamma (cm2 s)-1 has been placed on the emission in this line from the central radian of the Galactic plane. Less stringent limits have been set on the production of Be-7 in Nova Aquilae 1982, Nova Vulpeculae 1984 No. 2, and Nova Centauri 1986 from observations with the same instrument. C1 USN,RES LAB,EO HULBURT CTR SPACE RES,WASHINGTON,DC 20375. RP HARRIS, MJ (reprint author), SM SYST & RES CORP,SUITE 510,8401 CORP DR,LANDOVER,MD 20785, USA. NR 22 TC 31 Z9 31 U1 0 U2 0 PU UNIV CHICAGO PRESS PI CHICAGO PA 5720 S WOODLAWN AVE, CHICAGO, IL 60637 SN 0004-637X J9 ASTROPHYS J JI Astrophys. J. PD JUL 1 PY 1991 VL 375 IS 1 BP 216 EP 220 DI 10.1086/170183 PN 1 PG 5 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA FT836 UT WOS:A1991FT83600020 ER PT J AU WOLFF, MT WOOD, KS IMAMURA, JN AF WOLFF, MT WOOD, KS IMAMURA, JN TI NOISE-DRIVEN RADIATIVE SHOCKS - A NEW MODEL FOR THE OPTICAL QUASI-PERIODIC OSCILLATIONS OF THE AM HERCULIS OBJECTS SO ASTROPHYSICAL JOURNAL LA English DT Article DE HYDRODYNAMICS; SHOCK WAVES; STARS ACCRETION; STARS BINARIES; STARS WHITE DWARFS ID X-RAY; STABILITY PROPERTIES; WHITE-DWARFS; 2A 0311-227; ACCRETION; INSTABILITY; VARIABILITY; STARS AB We have developed a model for the 0.3-1.2 Hz optical quasi-periodic oscillations (QPOs) observed in a number of AM Her-type binary systems. We suggest that the observed optical modulation is the result of shock oscillations induced by nonsteady accretion flows. We show that time-dependent models of radiative shock waves in nonsteady accretion flows onto magnetic white dwarfs with mass 0.6 M. and magnetic field strength of 30 MG can produce optical QPOs similar to those observed in the AM Her objects. Theoretical calculations have shown that shock oscillations cannot be sustained for these white dwarf parameters when the accretion rates is constant. We discuss the implications of this finding for our understanding of the temporal characteristics of the AM Her objects. C1 USN,RES LAB,CODE 4121,WASHINGTON,DC 20375. UNIV OREGON,INST THEORET SCI,EUGENE,OR 97403. UNIV OREGON,DEPT PHYS,EUGENE,OR 97403. RP WOLFF, MT (reprint author), USN,RES LAB,UNIV SPACE RES ASSOC,CODE 41219,WASHINGTON,DC 20375, USA. NR 19 TC 20 Z9 20 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 JUL 1 PY 1991 VL 375 IS 1 BP L31 EP L34 DI 10.1086/186081 PN 2 PG 4 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA FT838 UT WOS:A1991FT83800008 ER PT J AU WHINNERY, JE AF WHINNERY, JE TI MEDICAL CONSIDERATIONS FOR HUMAN EXPOSURE TO ACCELERATION-INDUCED LOSS OF CONSCIOUSNESS SO AVIATION SPACE AND ENVIRONMENTAL MEDICINE LA English DT Article; Proceedings Paper CT 1989 ANNUAL SCIENTIFIC MEETING OF THE AEROSPACE MEDICAL ASSOC CY 1989 CL WASHINGTON, DC SP AEROSP MED ASSOC AB Unconsciousness in humans has probably been occurring since before recorded history. Acceleration-induced loss of consciousness (G-LOC) in flight has been occurring since 1919. Loss of consciousness and syncope are common occurrences in clinical medicine with G-LOC, occurring in a large number of aircrew and research subjects during centrifuge exposures. Although the major risk to humans exposed t centrifuge-induced G-LOC is related directly to the central nervous, cardiac, and musculoskeletal (neck and back) systems, other risks are also present. Human exposure to G-LOC is required to help solve the G-LOC problem in aviators. To perform such human research, the benefits must clearly outweigh the risks to the human. Even if the risk-benefit ratio is considered favorably balanced, continued monitoring of individuals exposed to G-LOC is mandatory. To facilitate monitoring of humans exposed to G-LOC, a central nervous system (CNS) insult classification system would be of significant value. A suggested classification scheme which considers the type of CNS insult, the history of exposure to G-LOC, and the temporal evolution of potential CNS insult is developed. To date there is no indication that G-LOC episodes have any associated long term or persistent psychophysiological sequelae. Improved acute and long term evaluation of humans exposed to G-LOC are, however, important aspects of conducting G-LOC research with humans. Such research and careful monitoring are necessary to understand and eventually solve the G-LOC problem in aviators. RP WHINNERY, JE (reprint author), USN,CTR AIR DEV,CODE 602C,WARMINSTER,PA 18974, USA. NR 22 TC 5 Z9 5 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 JUL PY 1991 VL 62 IS 7 BP 618 EP 623 PG 6 WC Public, Environmental & Occupational Health; Medicine, General & Internal; Sport Sciences SC Public, Environmental & Occupational Health; General & Internal Medicine; Sport Sciences GA FU023 UT WOS:A1991FU02300004 PM 1898295 ER PT J AU RUDOLPH, AS GOINS, B AF RUDOLPH, AS GOINS, B TI THE EFFECT OF HYDRATION STRESS SOLUTES ON THE PHASE-BEHAVIOR OF HYDRATED DIPALMITOYLPHOSPHATIDYLCHOLINE SO BIOCHIMICA ET BIOPHYSICA ACTA LA English DT Article DE HYDRATION; PHASE BEHAVIOR; DIPALMITOYLPHOSPHATIDYLCHOLINE ID FREEZE-DRIED LIPOSOMES; PROLINE; STABILIZATION; MEMBRANES; TREHALOSE; CRYOPROTECTANTS; PHOSPHOLIPIDS; ACCUMULATION; SUCROSE; SUGARS AB We have investigated the interaction of solutes found to accumulate in biological systems during chilling, dehydration, and salt stress with fully hydrated multilamellar and unilamellar vesicles of dipalmitoylphosphatidylcholine (DPPC). We have focused on a series of mono-, di-, and tri-substituted amines (glycine, 4-hydroxyproline, proline, and betaine) and contrasted the action of these solutes to trehalose, a protective disaccharide. Differential scanning calorimetry studies show that when DPPC is scanned in the presence of increasing concentrations of these solutes (up to 3 M), there is a moderate increase in the pre-transition temperature (1-6-degrees-C) with a smaller increase (1-2-degrees-C) in the main transition temperature of hydrated multilamellar vesicles of DPPC. Other calorimetric parameters (DELTA-H, DELTA-T1/2, Cp(max) determined for the pre-transition and main transition were similar independent of the solute. In each case, the main phase transition was broadened with increasing solute while the transition enthalpy was not significantly affected. RP RUDOLPH, AS (reprint author), USN,RES LAB,BIOMOLEC ENGN BRANCH,CODE 6090,WASHINGTON,DC 20375, USA. RI Goins, Beth/F-1311-2010 NR 23 TC 16 Z9 16 U1 1 U2 3 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0006-3002 J9 BIOCHIM BIOPHYS ACTA PD JUL 1 PY 1991 VL 1066 IS 1 BP 90 EP 94 DI 10.1016/0005-2736(91)90255-7 PG 5 WC Biochemistry & Molecular Biology; Biophysics SC Biochemistry & Molecular Biology; Biophysics GA FW869 UT WOS:A1991FW86900015 PM 2065073 ER PT J AU PHEGLEY, L CROSIAR, C AF PHEGLEY, L CROSIAR, C TI THE 3RD PHASE OF TESS SO BULLETIN OF THE AMERICAN METEOROLOGICAL SOCIETY LA English DT Article AB The U.S. Navy has developed the Tactical Environmental Support System, third generation, TESS(3), a computer workstation to provide environmental information for the Navy's tactical decision makers. With interfaces to real-time satellite data, to commercial weather teletype, and to naval communication broadcasts, the TESS(3) maintains a dynamic environmental database to support meteorological and oceanographic requirements. This article describes the TESS(3) system. With delivery of TESS(3) stations to both ashore and afloat sites, the Navy oceanographer/meterologist has an updated toolbox for analysis and forecasting. The TESS(3) system allows the forecaster to acquire, assimilate, and disseminate information rapidly for quick utilization - a definite improvement for Navy operational environmental support. RP PHEGLEY, L (reprint author), USN,OCEANOG & ATMOSPHER RES LAB,MONTEREY,CA 93943, USA. NR 1 TC 6 Z9 6 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 JUL PY 1991 VL 72 IS 7 BP 954 EP 960 DI 10.1175/1520-0477(1991)072<0954:TTPOT>2.0.CO;2 PG 7 WC Meteorology & Atmospheric Sciences SC Meteorology & Atmospheric Sciences GA GL655 UT WOS:A1991GL65500001 ER PT J AU SCHULZE, KG SCHMIDTNIELSEN, A ACHILLE, LB AF SCHULZE, KG SCHMIDTNIELSEN, A ACHILLE, LB TI COMPARING 3 NUMBERS - THE EFFECT OF NUMBER OF DIGITS, RANGE, AND LEADING ZEROS SO BULLETIN OF THE PSYCHONOMIC SOCIETY LA English DT Article ID 2-DIGIT C1 USN,RES LAB,HUMAN COMP INTERACT LAB,CODE 5532,WASHINGTON,DC 20375. USN ACAD,ANNAPOLIS,MD 21402. NR 8 TC 1 Z9 1 U1 0 U2 0 PU PSYCHONOMIC SOC INC PI AUSTIN PA 1710 FORTVIEW RD, AUSTIN, TX 78704 SN 0090-5054 J9 B PSYCHONOMIC SOC PD JUL PY 1991 VL 29 IS 4 BP 361 EP 364 PG 4 WC Psychology, Mathematical SC Psychology GA FU974 UT WOS:A1991FU97400023 ER PT J AU SCHMITT, HA MUFTI, A AF SCHMITT, HA MUFTI, A TI BERRY PHASE FOR U(1/1) COHERENT STATES SO CANADIAN JOURNAL OF PHYSICS LA English DT Article ID JAYNES-CUMMINGS MODEL AB Berry's geometrical phase is calculated for the coherent states of the compact unitary supergroup U(1/1). With properly chosen parameters, these coherent states are shown to be eigenstates of the nonresonant two-level Jaynes-Cummings Hamiltonian. C1 UNIV ARIZONA,DEPT PHYS,ARIZONA MAT LAB,TUCSON,AZ 85721. RP SCHMITT, HA (reprint author), USN,CTR WARFARE ASSESSMENT,POMONA,CA 91769, USA. NR 15 TC 0 Z9 0 U1 0 U2 0 PU NATL RESEARCH COUNCIL CANADA PI OTTAWA PA RESEARCH JOURNALS, MONTREAL RD, OTTAWA ON K1A 0R6, CANADA SN 0008-4204 J9 CAN J PHYS JI Can. J. Phys. PD JUL PY 1991 VL 69 IS 7 BP 873 EP 874 PG 2 WC Physics, Multidisciplinary SC Physics GA GE323 UT WOS:A1991GE32300015 ER PT J AU CONNOLLY, JP MCGUYER, CA SAGEMAN, WS BAILEY, H AF CONNOLLY, JP MCGUYER, CA SAGEMAN, WS BAILEY, H TI INTRATHORACIC OSTEOSARCOMA DIAGNOSED BY CT SCAN AND PLEURAL BIOPSY SO CHEST LA English DT Note ID PAROSTEAL OSTEO-SARCOMA; COMPUTED-TOMOGRAPHY AB Osteosarcoma rarely presents as a primary lesion in the chest, whereas pulmonary metastases are common. The diagnosis of primary intrathoracic osteosarcoma has invariably been by thoracotomy or autopsy. We present a case of a densely calcified, primary intrathoracic osteosarcoma where diagnosis was made antemortem by pleural biopsies and computed tomography scan. C1 USN HOSP,DEPT LAB MED,SAN DIEGO,CA 92134. USN HOSP,DEPT RADIOL,SAN DIEGO,CA 92134. USN HOSP,DEPT CLIN INVEST,SAN DIEGO,CA 92134. RP CONNOLLY, JP (reprint author), USN HOSP,DEPT INTERNAL MED,DIV PULM,SAN DIEGO,CA 92134, USA. NR 10 TC 2 Z9 2 U1 0 U2 0 PU AMER COLL CHEST PHYSICIANS PI NORTHBROOK PA 3300 DUNDEE ROAD, NORTHBROOK, IL 60062-2348 SN 0012-3692 J9 CHEST JI Chest PD JUL PY 1991 VL 100 IS 1 BP 265 EP 267 DI 10.1378/chest.100.1.265 PG 3 WC Critical Care Medicine; Respiratory System SC General & Internal Medicine; Respiratory System GA FV610 UT WOS:A1991FV61000061 PM 2060361 ER PT J AU KAILASANATH, K GARDNER, JH ORAN, ES BORIS, JP AF KAILASANATH, K GARDNER, JH ORAN, ES BORIS, JP TI NUMERICAL SIMULATIONS OF UNSTEADY REACTIVE FLOWS IN A COMBUSTION-CHAMBER SO COMBUSTION AND FLAME LA English DT Article ID ACOUSTIC-VORTEX INTERACTIONS; DUMP; OSCILLATIONS AB A potentially important source of large-pressure oscillations in combustors is an instability induced by the interactions between large-scale vortex structures, acoustic waves, and chemical energy release. To study these interactions, we have performed time-dependent, compressible numerical simulations of the flow field in an idealized ramjet consisting of an axisymmetric inlet and combustor and a choked nozzle. Both reactive and nonreactive flows have been simulated. The nonreactive flow calculations show complex interactions among the natural instability frequency of the shear layer at the inlet-combustor junction and the acoustics of both the inlet and the combustor. Vortex shedding occurs at the natural instability frequency of the shear layer but vortex mergings are affected by the acoustic frequencies of the system. The entire flow oscillates at a low frequency that corresponds to that of a quarter-wave mode in the inlet. For the particular reactive flow case studied, energy release alters the flow field substantially. In the first cycle after ignition, fluid expansion due to energy release quickly destroys the pattern of vortex mergings observed in the cold flow and a new pattern emerges that is dominated by a large vortex. In subsequent cycles, most of the energy release occurs after vortex mergings have produced this large vortex. Energy release in this large vortex is in phase with the pressure oscillation over a substantial region of the combustor between the axial stations 2.5 to about 5 D (where D is the diameter of the inlet). This results in the observed amplification of the low-frequency oscillations. RP KAILASANATH, K (reprint author), USN,RES LAB,COMPUTAT PHYS & FLUID DYNAM LAB,WASHINGTON,DC 20375, USA. NR 34 TC 21 Z9 21 U1 0 U2 5 PU ELSEVIER SCIENCE INC PI NEW YORK PA 655 AVENUE OF THE AMERICAS, NEW YORK, NY 10010 SN 0010-2180 J9 COMBUST FLAME JI Combust. Flame PD JUL PY 1991 VL 86 IS 1-2 BP 115 EP 134 DI 10.1016/0010-2180(91)90060-O PG 20 WC Thermodynamics; Energy & Fuels; Engineering, Multidisciplinary; Engineering, Chemical; Engineering, Mechanical SC Thermodynamics; Energy & Fuels; Engineering GA GA828 UT WOS:A1991GA82800010 ER PT J AU GILES, HN KOENIG, JWJ NEIHOF, RA SHAY, JY WOODWARD, PW AF GILES, HN KOENIG, JWJ NEIHOF, RA SHAY, JY WOODWARD, PW TI STABILITY OF REFINED PRODUCTS AND CRUDE-OIL STORED IN LARGE CAVITIES IN SALT DEPOSITS - BIOGEOCHEMICAL ASPECTS SO ENERGY & FUELS LA English DT Article AB Large cavities in salt deposits have been used in a number of countries for stocking petroleum in strategic reserves and for operational storage. Stocks have included hydrocarbon gases, motor gasoline, home heating oil, jet fuel, and crude oil. Crude oil is not subject to deleterious changes in quality, although it does tend to deposit sludge during storage. No changes in quality of light hydrocarbons such as propane and butane have been reported. During storage in solution-mined cavities, gasoline and middle distillates can become contaminated with brine causing them to fail certain specification tests. Oxygen brought in with the water used to leach cavities can promote autoxidation resulting in formation of soluble or insoluble gum in some products. The walls of salt cavities are largely inert with respect to stored petroleum, and no reactions between them have been reported. Biodeterioration of petroleum is generally inhibited by the high salinity of the brine, but episodic bacterial activity could occur following injections of relatively fresh surface water resulting in catabolism of hydrocarbons, or production of hydrogen sulfide or methane. With careful planning and exercise of a few precautions, most quality problems encountered to date can be avoided. Petroleum stored in cavities in salt should not need to be rolled over as frequently to maintain its quality as it would if stored in aboveground tanks. C1 ERDOLBEVORRATUNGSVERBAND,W-2000 HAMBURG 36,GERMANY. USN,RES LAB,WASHINGTON,DC 20375. NATL INST PETROL & ENERGY RES,BARTLESVILLE,OK 74005. RP GILES, HN (reprint author), US DOE,OFF STRATEG PETR RESERVE,WASHINGTON,DC 20585, USA. NR 38 TC 3 Z9 4 U1 1 U2 3 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0887-0624 J9 ENERG FUEL JI Energy Fuels PD JUL-AUG PY 1991 VL 5 IS 4 BP 602 EP 608 DI 10.1021/ef00028a012 PG 7 WC Energy & Fuels; Engineering, Chemical SC Energy & Fuels; Engineering GA FY124 UT WOS:A1991FY12400012 ER PT J AU MONROY, RL DAVIS, TA NIELSEN, TB KANG, YH STATON, AJ AF MONROY, RL DAVIS, TA NIELSEN, TB KANG, YH STATON, AJ TI PERIPHERAL-BLOOD MEGAKARYOCYTE PROGENITOR CELLS FORM COLONIES INVITRO ON VASCULAR ENDOTHELIAL-CELLS WHEN STIMULATED WITH GM-CSF SO EXPERIMENTAL HEMATOLOGY LA English DT Meeting Abstract C1 USN,MED RES INST,BETHESDA,MD 20814. NR 0 TC 0 Z9 0 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 JUL PY 1991 VL 19 IS 6 BP 495 EP 495 PG 1 WC Hematology; Medicine, Research & Experimental SC Hematology; Research & Experimental Medicine GA FQ310 UT WOS:A1991FQ31000147 ER PT J AU VOGT, PR AF VOGT, PR TI ESTUARINE STREAM-PIRACY - CALVERT COUNTY, UNITED-STATES ATLANTIC COASTAL-PLAIN SO GEOLOGY LA English DT Article AB The topography of Maryland's western shore of the Chesapeake Bay shows that five streams now flowing eastward into the bay comprise the pirated (and inverted) headwaters of streams previously flowing westward from a vanished Pliocene upland now occupied by the central Chesapeake. Estuarine shoreline erosion during Pleistocene interglaciations removed the upland, exposing the upper reaches of west-flowing stream valleys. Headward (westward) erosion by east-flowing streams then occurred along existing valleys, facilitated by steep eastward gradients and easily eroded valley-floor sediments. Stream inversion may be more common than previously recognized, since any eroding shoreline causes consumption of seaward-draining watershed and steepening of gradients, thus setting the stage for eventual stream inversion. RP VOGT, PR (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 8 TC 4 Z9 4 U1 0 U2 1 PU GEOLOGICAL SOC AMERICA PI BOULDER PA PO BOX 9140 3300 PENROSE PLACE, BOULDER, CO 80301 SN 0091-7613 J9 GEOLOGY JI Geology PD JUL PY 1991 VL 19 IS 7 BP 754 EP 757 DI 10.1130/0091-7613(1991)019<0754:ESPCCU>2.3.CO;2 PG 4 WC Geology SC Geology GA FV902 UT WOS:A1991FV90200021 ER PT J AU DANDREA, JA AF DANDREA, JA TI MICROWAVE-RADIATION ABSORPTION - BEHAVIORAL-EFFECTS SO HEALTH PHYSICS LA English DT Article ID ELECTROMAGNETIC ENERGY; OPERANT-BEHAVIOR; CHRONIC EXPOSURE; MHZ MICROWAVES; ALBINO-RATS; 0.5 MW/CM2; IRRADIATION; BODY; ANIMALS; MODELS AB The literature contains much evidence that absorption of microwave energy will lead to behavioral changes in man and laboratory animals. The changes include simple perturbations or outright stoppage of ongoing behavior. On one extreme, intense microwave absorption can result in seizures followed by death. On the other extreme, man and animals can hear microwave pulses at very low rates of absorption. Under certain conditions of exposure, animals will avoid microwaves, while under other conditions, they will actively work to obtain warmth produced by microwaves. Some research has shown behavioral effects during chronic exposure to low-level microwaves. The specific absorption rates that produce behavioral effects seem to depend on microwave frequency, but controversy exists over thresholds and mechanism of action. In all cases, however, the behavioral disruptions cease when chronic microwave exposure is terminated. Thermal changes in man and animals during microwave exposure appear to account for all reported behavioral effects. RP DANDREA, JA (reprint author), USN, AEROSP MED RES LAB, NAVAL AIR STN, PENSACOLA, FL 32508 USA. NR 69 TC 14 Z9 14 U1 2 U2 5 PU LIPPINCOTT WILLIAMS & WILKINS PI PHILADELPHIA PA 530 WALNUT ST, PHILADELPHIA, PA 19106-3621 USA SN 0017-9078 EI 1538-5159 J9 HEALTH PHYS JI Health Phys. PD JUL PY 1991 VL 61 IS 1 BP 29 EP 40 DI 10.1097/00004032-199107000-00003 PG 12 WC Environmental Sciences; Public, Environmental & Occupational Health; Nuclear Science & Technology; Radiology, Nuclear Medicine & Medical Imaging SC Environmental Sciences & Ecology; Public, Environmental & Occupational Health; Nuclear Science & Technology; Radiology, Nuclear Medicine & Medical Imaging GA FW001 UT WOS:A1991FW00100004 PM 2061046 ER PT J AU SCHUETTE, LC AF SCHUETTE, LC TI ACOUSTIC HOLOGRAPHY SO IEEE COMPUTER GRAPHICS AND APPLICATIONS LA English DT Article RP SCHUETTE, LC (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 3 TC 1 Z9 1 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 0272-1716 J9 IEEE COMPUT GRAPH JI IEEE Comput. Graph. Appl. PD JUL PY 1991 VL 11 IS 4 BP 12 EP 13 DI 10.1109/38.126875 PG 2 WC Computer Science, Software Engineering SC Computer Science GA FV362 UT WOS:A1991FV36200005 ER PT J AU DWYER, RF AF DWYER, RF TI RANGE AND DOPPLER INFORMATION FROM 4TH-ORDER SPECTRA SO IEEE JOURNAL OF OCEANIC ENGINEERING LA English DT Article ID ACOUSTIC TELEMETRY; PERFORMANCE AB In an active sonar system setting, a new method is evaluated that extracts range and Doppler information from a Doppler-spread active sonar echo. The Doppler spreading is based on Van Trees' Gaussian amplitude modulating model, and the new method is based on the Fourier transform of a special case of the fourth-order cumulant. Specifically, from the envelope of the Gaussian amplitude modulated echo of a transmitted coded pulse train, the second-order spectrum and the Fourier transform of a special case of the fourth-order cumulant are derived and analyzed for their ability to extract range and Doppler information. It is shown that the new method can theoretically extract range and Doppler information without degradation. The reason for this result is that a special case of the fourth-order cumulant is independent of the covariance of the Gaussian amplitude modulating function. These methods are also simulated and compared with the simulated results of the range-Doppler ambiguity function. This shows that the ambiguity function and the second-order spectrum are degraded due to the Gaussian amplitude modulation. The results are further demonstrated by simulating the three range-Doppler extraction methods for the received echo in noise. RP DWYER, RF (reprint author), USN,CTR UNDERWATER SYST,NEW LONDON,CT 06320, USA. NR 42 TC 12 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 0364-9059 J9 IEEE J OCEANIC ENG JI IEEE J. Ocean. Eng. PD JUL PY 1991 VL 16 IS 3 BP 233 EP 243 DI 10.1109/48.90880 PG 11 WC Engineering, Civil; Engineering, Ocean; Engineering, Electrical & Electronic; Oceanography SC Engineering; Oceanography GA FT326 UT WOS:A1991FT32600001 ER PT J AU SCHULER, DL KELLER, WC PLANT, WJ AF SCHULER, DL KELLER, WC PLANT, WJ TI A 3-FREQUENCY SCATTEROMETER TECHNIQUE FOR THE MEASUREMENT OF OCEAN WAVE SPECTRA SO IEEE JOURNAL OF OCEANIC ENGINEERING LA English DT Article ID DUAL-FREQUENCY RADAR; MICROWAVE; AIRCRAFT AB A new microwave technique for the measurement of ocean wave spectra has been compared with wave gauge output during extensive field testing at the Coastal Engineering Research Center's Field Research Facility, Duck, North Carolina. The method is based on the dual-frequency, or DELTA-k, technique for detecting long ocean waves by matching the modulation of short waves with the beat wavelength between two transmitted microwave frequencies. The new method, however, ultilizes three microwave frequencies in order to reduce mean backscatter not related to short wave modulation. Prototype scatterometers have been built at L-band, and later, because of its suitability for aircraft use, at K(u)-band. Wave spectra have been measured by both radar systems which, when properly normalized, agree well with simultaneous in situ measurements taken by conventional wave gauges at the pier site. Thirteen sets of spectra have been computed, five of which correspond to a situation in which a local wind sea was generated and then decayed. Although the present experiment does not demonstrate the directionality of this new technique, its similarity to previous DELTA-k measurements, which do demonstrate directionality, leads us to conclude that this new method is a promising technique for measuring the directional ocean wave variance spectrum. C1 WOODS HOLE OCEANOG INST,WOODS HOLE,MA 02543. RP SCHULER, DL (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 16 TC 2 Z9 2 U1 0 U2 0 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0364-9059 J9 IEEE J OCEANIC ENG JI IEEE J. Ocean. Eng. PD JUL PY 1991 VL 16 IS 3 BP 244 EP 253 DI 10.1109/48.90881 PG 10 WC Engineering, Civil; Engineering, Ocean; Engineering, Electrical & Electronic; Oceanography SC Engineering; Oceanography GA FT326 UT WOS:A1991FT32600002 ER PT J AU CAREY, WM MOSELEY, WB AF CAREY, WM MOSELEY, WB TI SPACE-TIME PROCESSING, ENVIRONMENTAL ACOUSTIC EFFECTS SO IEEE JOURNAL OF OCEANIC ENGINEERING LA English DT Article DE ARRAY PROCESSING; COHERENCE; ANGLE SPREAD; MULTIPATH EFFECTS ID SYNTHETIC-APERTURE; SOUND-PROPAGATION; OCEAN; FLUCTUATIONS; WAVES AB The processing of acoustic waveforms by arrays requires an understanding of the temporal and spatial characteristics of the signal and noise fields. Temporal and spatial processing schemes are analogous transforms that can employ a variety of windows (such as Hann, Hamming, etc.). However, the ocean environment is a filter that introduces variability to a signal in both spatial and temporal domains. This randomness is superimposed on an ambient sound channel characteristic. In the case of static source and receiver combinations, the limits on horizontal broadside array resolution are due to volume scattering and surface scattering as long as the time scale is less than the signal correlation time. However, in the case of a moving source-receiver, the temporal and spatial scales are coupled through the sound channel characteristic and the fluctuation effects due to multipath or modal variations must also be considered. This paper examines the subject of space-time processing and reviews fundamental environmental effects and their influence on arrays in the deep ocean sound channel. C1 NAVAL & OCEANOG & ATMOSPHER RES LAB,STENNIS SPACE CTR,MI 49529. RP CAREY, WM (reprint author), USN,CTR UNDERWATER SYST,SURFACE SHIP ASW DIRECTORATE,NEW LONDON,CT 06320, USA. NR 67 TC 23 Z9 27 U1 1 U2 1 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0364-9059 J9 IEEE J OCEANIC ENG JI IEEE J. Ocean. Eng. PD JUL PY 1991 VL 16 IS 3 BP 285 EP 301 DI 10.1109/48.90885 PG 17 WC Engineering, Civil; Engineering, Ocean; Engineering, Electrical & Electronic; Oceanography SC Engineering; Oceanography GA FT326 UT WOS:A1991FT32600006 ER PT J AU GERLACH, K KRETSCHMER, FF AF GERLACH, K KRETSCHMER, FF TI RECIPROCAL RADAR WAVE-FORMS SO IEEE TRANSACTIONS ON AEROSPACE AND ELECTRONIC SYSTEMS LA English DT Article AB Digitally coded radar waveforms can be employed to obtain large time-bandwidth products (pulse compression ratios). A perfect periodic code is defined to be a periodic code whose autocorrelation function has zero sidelobes and whose amplitude is uniform (maximum power efficiency = 1). An asymptotically perfect periodic code has the property that as the number of elements in the code goes to infinity the autocorrelation function of the code has zero sidelobes and its power efficiency is one. We introduce a new class of radar waveforms that are either perfect or asymptotically perfect codes. We call these reciprocal codes because they can be derived through a linear transformation of the known codes. We also examine the aperiodic performance of the reciprocal code. This is motivated by the tendency of good periodic codes to yield good aperiodic codes, and hence high pulse compression ratios with low sidelobe responses are attainable. RP GERLACH, K (reprint author), USN,RES LAB,CODE 54001,WASHINGTON,DC 20375, USA. NR 7 TC 5 Z9 5 U1 0 U2 0 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0018-9251 J9 IEEE T AERO ELEC SYS JI IEEE Trans. Aerosp. Electron. Syst. PD JUL PY 1991 VL 27 IS 4 BP 646 EP 654 DI 10.1109/7.85038 PG 9 WC Engineering, Aerospace; Engineering, Electrical & Electronic; Telecommunications SC Engineering; Telecommunications GA GB874 UT WOS:A1991GB87400008 ER PT J AU GERLACH, K AF GERLACH, K TI CONVERGENCE BOUNDS OF AN SMI GRAM-SCHMIDT CANCELER IN COLORED NOISE SO IEEE TRANSACTIONS ON AEROSPACE AND ELECTRONIC SYSTEMS LA English DT Article ID LATTICE AB The performance of the Sampled Matrix Inversion (SMI) adaptive algorithm in colored noise is investigated using the Gram-Schmidt (GS) canceler as an analysis tool. Lower and upper bounds of average convergence are derived indicating as expected, that average convergence slows as the input time samples become correlated. When the input samples are uncorrelated, the fastest SMI algorithm convergence occurs. When the input samples are correlated then the convergence bounds depend on the number of channels N, the number of samples per channels K, and the eigenvalues associated with K x K correlation matrix of the samples in a given channel. This matrix is assumed identical for all channels. RP GERLACH, K (reprint author), USN,RES LAB,TARGET CHARACTERISTICS BRANCH,CODE 53401G,WASHINGTON,DC 20375, USA. NR 10 TC 2 Z9 2 U1 0 U2 0 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0018-9251 J9 IEEE T AERO ELEC SYS JI IEEE Trans. Aerosp. Electron. Syst. PD JUL PY 1991 VL 27 IS 4 BP 655 EP 666 DI 10.1109/7.85039 PG 12 WC Engineering, Aerospace; Engineering, Electrical & Electronic; Telecommunications SC Engineering; Telecommunications GA GB874 UT WOS:A1991GB87400009 ER PT J AU LEE, JS GRUNES, MR MANGO, SA AF LEE, JS GRUNES, MR MANGO, SA TI SPECKLE REDUCTION IN MULTIPOLARIZATION, MULTIFREQUENCY SAR IMAGERY SO IEEE TRANSACTIONS ON GEOSCIENCE AND REMOTE SENSING LA English DT Article DE SPECKLE REDUCTION; POLARIMETRIC SAR; SPECKLE FILTERING ID APERTURE RADAR IMAGES; NOISE AB The availability of fully polarimetric SAR data makes it possible to utilize the co-polarized and cross-polarized images for speckle reduction. In this paper an algorithm is developed to take advantage of this polarization diversity to suppress the speckle effect with much less resolution broadening than using spatial filtering. The coupling between polarization channels is minimized by using local intensity ratios. The degree of speckle reduction is similar to two-look or three-look processing. The same algorithm can also be used to process multifrequency polarimetric SAR. For the three-frequency JPL aircraft SAR data (P-, L-, and C-bands), speckle reduction equivalent to six-look processing can be achieved. Further speckle reduction is possible by applying speckle filters in the spatial domain. In addition, a vector speckle filter which operates simultaneously in the polarization and spatial domains is tested. Experimental results with simulated polarimetric SAR as well as one-look and multilook polarimetric SAR data from JPL and NASA demonstrate the effectiveness of these speckle reductions, with minimum resolution broadening and coupling between polarimetric and frequency channels. Comparisons with other algorithms are also made. C1 USN,RES LAB,DIGITAL IMAGING PROC LAB,WASHINGTON,DC 20375. RP LEE, JS (reprint author), USN,RES LAB,CTR ADV SPACE SENSING,IMAGING SYST & RES BRANCH,WASHINGTON,DC 20375, USA. NR 12 TC 87 Z9 115 U1 2 U2 4 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 JUL PY 1991 VL 29 IS 4 BP 535 EP 544 DI 10.1109/36.135815 PG 10 WC Geochemistry & Geophysics; Engineering, Electrical & Electronic; Remote Sensing; Imaging Science & Photographic Technology SC Geochemistry & Geophysics; Engineering; Remote Sensing; Imaging Science & Photographic Technology GA FX027 UT WOS:A1991FX02700007 ER PT J AU WILLIAMS, SM HOFT, RG AF WILLIAMS, SM HOFT, RG TI IMPLEMENTATION OF CURRENT SOURCE INVERTER FOR POWER-LINE CONDITIONING SO IEEE TRANSACTIONS ON INDUSTRY APPLICATIONS LA English DT Article; Proceedings Paper CT 26TH ANNUAL MEETING OF THE INDUSTRY APPLICATIONS SOC OF THE IEEE CY SEP 28-OCT 01, 1991 CL DEARBORN, MI SP IEEE, IND APPL SOC ID HARMONICS AB Increasingly popular electronic loads typically induce harmonic current in the ac line and have lagging power factor. The power line conditioner (PLC) minimizes harmonic current in the ac line and improves power factor to unity. A six-switch current source inverter (CSI) is implemented for power-line conditioning. A 5-kVA test model of the CSI has been built using insulated gate bipolar transistors (IGBT's) controlled by a digital signal processor (DSP). To determine system performance, experimental results are compared with computer simulations of an innovative adaptive frequency domain control for pulse width modulated (PWM) switching of the CSI. C1 UNIV MISSOURI,POWER ELECTR RES CTR,COLUMBIA,MO 65211. RP WILLIAMS, SM (reprint author), USN,POSTGRAD SCH,MONTEREY,CA 93943, USA. NR 7 TC 2 Z9 2 U1 0 U2 0 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0093-9994 J9 IEEE T IND APPL JI IEEE Trans. Ind. Appl. PD JUL-AUG PY 1991 VL 27 IS 4 BP 773 EP 779 DI 10.1109/28.85495 PG 7 WC Engineering, Multidisciplinary; Engineering, Electrical & Electronic SC Engineering GA FY328 UT WOS:A1991FY32800026 ER PT J AU BARNETT, JT KEDEM, B AF BARNETT, JT KEDEM, B TI ZERO-CROSSING RATES OF FUNCTIONS OF GAUSSIAN-PROCESSES SO IEEE TRANSACTIONS ON INFORMATION THEORY LA English DT Letter DE STATIONARY TIME SERIES; RICES FORMULA FOR ZERO-CROSSING RATE; COSINE FORMULA FOR THE NUMBER OF SIGN-CHANGES OF A GAUSSIAN TIME SERIES; PRICES THEOREM; UNIFORMLY DISTRIBUTED PROCESS; LOGNORMAL PROCESS AB Formulas for the expected zero-crossing rates of random processes that are monotone transformations of Gaussian processes can be obtained using two different techniques. The first technique involves the derivation of the expected zero-crossing rate for discrete-time processes and extends the result to the continuous-time case by using an appropriate limiting argument. The second is a direct method that makes use, successively, of Price's theorem, the chain rule for derivatives, and Rice's formula for the expected zero-crossing rate of a Gaussian process. A constant, which depends on the variance of the transformed process and a second-moment of its derivative, is derived. Multiplying Rice's original expression by this constant yields the zero-crossing formula for the transformed process. The two methods can be used for the general level-crossing problem of random processes that are monotone functions of a Gaussian process. C1 UNIV MARYLAND,DEPT MATH,COLLEGE PK,MD 20742. RP BARNETT, JT (reprint author), USN,CTR SURFACE WARFARE,INFORMAT & MATH SCI BRANCH,SILVER SPRING,MD 20903, USA. NR 13 TC 23 Z9 23 U1 1 U2 2 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0018-9448 J9 IEEE T INFORM THEORY JI IEEE Trans. Inf. Theory PD JUL PY 1991 VL 37 IS 4 BP 1188 EP 1194 DI 10.1109/18.86972 PG 7 WC Computer Science, Information Systems; Engineering, Electrical & Electronic SC Computer Science; Engineering GA FT065 UT WOS:A1991FT06500027 ER PT J AU HARRIS, VG ELAM, WT VITTORIA, C AF HARRIS, VG ELAM, WT VITTORIA, C TI FMR AND EXAFS MODELING OF HEAT-TREATED FE-RICH AND CO-RICH TM-M THIN-FILMS SO IEEE TRANSACTIONS ON MAGNETICS LA English DT Article ID ABSORPTION FINE-STRUCTURE; X-RAY; MAGNETIC-PROPERTIES; METALLIC GLASSES; METGLAS-2605 CO; CURVED-WAVE; SCATTERING; ALLOYS; CRYSTALLIZATION; COERCIVITY AB Ion-beam sputter-deposited alloy films of Co74Fe6B15Si5 and Fe75Ni5B15Si5 were examined for their magnetic and structural properties. Films were characterized by ferromagnetic resonance, vibrating sample magnetometry, and extended X-ray absorption fine structure (EXAFS) analysis. Using atomic parameters deduced from EXAFS modeling and fitting procedures, magnetic properties were calculated with no adjustable parameters. Correlation between perpendicular FMR measurements and EXAFS first-shell modeling suggests a low temperature formation of cobalt-borides in the Co74Fe6B15Si5 alloy. Growth of these crystallites is believed to facilitate an acceptable ratio of Co:Fe to allow for the formation of a bcc solid solution. This crystallization product is detected to form near T(ann) = 300-degrees-C. Correspondingly soft magnetic properties deteriorate. Annealed Fe75Ni5B15Si5 samples did not display evidence of structural and/or magnetic instabilities until the onset of long-range crystallization near T(ann) = 400-degrees-C. These results reveal the origins of an anomalous structural change, which occurs in Co-rich TM-M alloy films subjected to heat treatments at temperatures below crystallization. C1 NORTHEASTERN UNIV,DEPT ELECT & COMP ENGN,BOSTON,MA 02115. RP HARRIS, VG (reprint author), USN,RES LAB,DIV CONDENSED MATTER & RADIAT SCI,CODE 4683,WASHINGTON,DC 20375, USA. NR 49 TC 1 Z9 1 U1 0 U2 2 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0018-9464 J9 IEEE T MAGN JI IEEE Trans. Magn. PD JUL PY 1991 VL 27 IS 4 BP 3620 EP 3639 DI 10.1109/20.102933 PG 20 WC Engineering, Electrical & Electronic; Physics, Applied SC Engineering; Physics GA GP593 UT WOS:A1991GP59300013 ER PT J AU JOHNSON, GA KAPOOR, VJ SHOKRANI, M MESSICK, LJ NGUYEN, R STALL, RA MCKEE, MA AF JOHNSON, GA KAPOOR, VJ SHOKRANI, M MESSICK, LJ NGUYEN, R STALL, RA MCKEE, MA TI INDIUM GALLIUM-ARSENIDE MICROWAVE-POWER TRANSISTORS SO IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES LA English DT Article ID DEPLETION-MODE MISFETS; INSULATOR; INTERFACE AB Depletion-mode InGaAs microwave power MISFET's with 1-mu-m gate lengths and up to 1 mm gate widths have been fabricated using an ion-implanted process. The devices employed a plasma-deposited silicon/silicon dioxide gate insulator. The dc current-voltage (I-V) characteristics and RF power performance at 9.7 GHz are presented. The output power, power-added efficiency, and power gain as a function of input power are reported. An output power of 1.07 W at 9.7 GHz with a corresponding power gain and power-added efficiency of 4.3 dB and 38%, respectively, was obtained. The large-gate-width devices provided over twice the previously reported output power for InGaAs MISFET's at X band. In addition, the first report of RF output power stability of InGaAs MISFET's over a 24 h period is also presented. An output power stability within 1.2% over 24 h of continuous operation was achieved. In addition, a drain current drift of 4% over 10(4) s was obtained. C1 USN,CTR OCEAN SYST,SAN DIEGO,CA 92152. EMCORE CORP,SOMERSET,NJ 08873. RP JOHNSON, GA (reprint author), UNIV CINCINNATI,DEPT ELECT & COMP ENGN,CINCINNATI,OH 45221, USA. NR 18 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 0018-9480 J9 IEEE T MICROW THEORY JI IEEE Trans. Microw. Theory Tech. PD JUL PY 1991 VL 39 IS 7 BP 1069 EP 1076 DI 10.1109/22.85371 PG 8 WC Engineering, Electrical & Electronic SC Engineering GA FP950 UT WOS:A1991FP95000001 ER PT J AU RAUSCHER, C AF RAUSCHER, C TI OPTOELECTRONIC APPROACH TO ON-CHIP DEVICE AND CIRCUIT CHARACTERIZATION AT MICROWAVE AND MILLIMETER-WAVE FREQUENCIES SO IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES LA English DT Article AB Scattering parameter measurements performed on semiconductor chip devices and circuits critically depend on the predictability of high-frequency connections between chip and pertinent test equipment. This is of particular concern at high microwave frequencies, and even more so at millimeter wavelengths. The technique to be described here solves the problem through chip-level integration of measurement system front end and device or circuit under test. Arrays of high-speed photoconductive circuit elements, in conjunction with special compensation networks, are thereby utilized to implement, on chip, all signal generation and sampling functions needed to efficiently perform time-domain reflectometry. The acquired time-domain information is then converted into equivalent device-under-test scattering parameter responses. The practicability of the approach is experimentally demonstrated with the help of five individual test structures that are realized in monolithic-integrated-circuit format on a GaAs substrate and operate over a full, uninterrupted 100 GHz frequency interval. RP RAUSCHER, C (reprint author), USN,RES LAB,DIV ELECTR SCI & TECHNOL,CODE 6851,WASHINGTON,DC 20375, USA. NR 8 TC 5 Z9 5 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 JUL PY 1991 VL 39 IS 7 BP 1179 EP 1193 DI 10.1109/22.85386 PG 15 WC Engineering, Electrical & Electronic SC Engineering GA FP950 UT WOS:A1991FP95000016 ER PT J AU PAVLOVSKIS, OR ROLLINS, DM HABERBERGER, RL GREEN, AE HABASH, L STROCKO, S WALKER, RI AF PAVLOVSKIS, OR ROLLINS, DM HABERBERGER, RL GREEN, AE HABASH, L STROCKO, S WALKER, RI TI SIGNIFICANCE OF FLAGELLA IN COLONIZATION RESISTANCE OF RABBITS IMMUNIZED WITH CAMPYLOBACTER SPP SO INFECTION AND IMMUNITY LA English DT Article ID INFANT MICE; INTESTINAL COLONIZATION; JEJUNI INFECTION; ANTIGENS; ENTERITIS; MODEL; IMMUNOGLOBULIN; INOCULATION; PROTECTION; EXPRESSION AB Cross-protection among different Lior and Penner serogroups of Campylobacter spp. was studied. Rabbits were orally immunized by gastric feeding with Campylobacter spp., and 27 to 30 days later, they were challenged with matched or unmatched serogroups by the removable intestinal tie adult rabbit diarrhea (RITARD) procedure. When immunized animals were challenged with different Lior serotypes, no protection against colonization was seen; however, when challenged with homologous Lior serogroups, protection was demonstrated. Immune animals were colonized for an average of 1 day or less versus at least 6 days for nonimmune animals. Rabbits challenged with matched Penner-unmatched Lior strains showed only marginal protection. Our study also demonstrated that flagella are important in initiating colonization and elicting protective immunity. Campylobacter coli VC167B3, an isogenic, nonflagellated mutant, did not colonize rabbits regardless of the route of administration. Single feeding of the mutant strain did not protect the host, whereas three feedings, 48 h apart, resulted in complete protection against the flagellated parent strain. When mutant strain immunized rabbits were challenged with other strains of the same Lior serotype, marginal protection was obtained. Immunogold labeling indicated that there is one or more antigens on the cell surface of the nonflagellated mutant which reacts with a polyclonal antiserum from organisms of the same Lior serogroup. These data implicated the flagellum as the cross-strain protective component of the Lior antigen complex. RP PAVLOVSKIS, OR (reprint author), USN,MED RES INST,DEPT INFECT DIS,BETHESDA,MD 20889, USA. NR 35 TC 79 Z9 80 U1 0 U2 1 PU AMER SOC MICROBIOLOGY PI WASHINGTON PA 1325 MASSACHUSETTS AVENUE, NW, WASHINGTON, DC 20005-4171 SN 0019-9567 J9 INFECT IMMUN JI Infect. Immun. PD JUL PY 1991 VL 59 IS 7 BP 2259 EP 2264 PG 6 WC Immunology; Infectious Diseases SC Immunology; Infectious Diseases GA FT922 UT WOS:A1991FT92200006 PM 2050397 ER PT J AU BAUSCH, DO BROWN, GG HUNDLEY, DR RAPP, SH ROSENTHAL, RE AF BAUSCH, DO BROWN, GG HUNDLEY, DR RAPP, SH ROSENTHAL, RE TI MOBILIZING MARINE CORPS OFFICERS SO INTERFACES LA English DT Article DE MILITARY APPLICATIONS; MANPOWER OPTIMIZATION; NETWORKS ID ASSIGNMENT AB The ability to rapidly mobilize the Marine Corps in times of crisis is a cornerstone of United States defense strategy. To mobilize rapidly, the marines need an efficient system for assigning officers to mobilization billets. The system we designed and built is based on a network optimization algorithm that works in conjunction with carefully designed and scrupulously maintained Marine Corps data bases. It takes less than 10 minutes on a 386-based personal computer to complete a mobilization involving 40,000 officers and 27,000 billets and to produce output suitable for generating orders to report via MAILGRAM. Prior to our work, the Marine Corps had a mainframe-based system that took two to four days to complete a mobilization. The new system is not only much faster than the old system, but it also produces significantly better assignments with respect to all measures of effectiveness considered. C1 USN,POSTGRAD SCH,DEPT OPERAT RES,MONTEREY,CA 93943. US MARINE CORPS,WASHINGTON,DC 20380. RP BAUSCH, DO (reprint author), INSIGHTS INC,BEND,OR 97709, USA. NR 14 TC 7 Z9 7 U1 0 U2 2 PU INST OPERATIONS RESEARCH MANAGEMENT SCIENCES PI LINTHICUM HTS PA 901 ELKRIDGE LANDING RD, STE 400, LINTHICUM HTS, MD 21090-2909 SN 0092-2102 J9 INTERFACES JI Interfaces PD JUL-AUG PY 1991 VL 21 IS 4 BP 26 EP 38 DI 10.1287/inte.21.4.26 PG 13 WC Management; Operations Research & Management Science SC Business & Economics; Operations Research & Management Science GA GC627 UT WOS:A1991GC62700004 ER PT J AU BROWN, GG CLEMENCE, RD TEUFERT, WR WOOD, RK AF BROWN, GG CLEMENCE, RD TEUFERT, WR WOOD, RK TI AN OPTIMIZATION MODEL FOR MODERNIZING THE ARMY HELICOPTER FLEET SO INTERFACES LA English DT Article DE MILITARY; COST EFFECTIVENESS PROGRAMMING; INTEGER APPLICATIONS FINANCE; CAPITAL BUDGETING AB The helicopter has grown in military stature for more than 40 years: its ascendancy has reformed the US Army. Unfortunately, the current army helicopter fleet consists predominantly of Vietnam-era aircraft approaching the end of their useful lives. We have captured complex procurement and modernization tasks in an optimization-based decision support system, christened PHOENIX, which recognizes yearly operating, maintenance, retirement, service-life extension, and new procurement costs while enforcing constraints on fleet age, technology mix, composition, and budgets over a multi-year planning horizon. The army has applied PHOENIX to helicopters with such success that it has already been adapted to tactical wheeled vehicles and is under consideration for further applications. C1 USA,CONCEPTS ANAL AGCY,BETHESDA,MD 20814. RP BROWN, GG (reprint author), USN,POSTGRAD SCH,DEPT OPERAT RES,MONTEREY,CA 93943, USA. NR 10 TC 11 Z9 11 U1 0 U2 2 PU INST OPERATIONS RESEARCH MANAGEMENT SCIENCES PI LINTHICUM HTS PA 901 ELKRIDGE LANDING RD, STE 400, LINTHICUM HTS, MD 21090-2909 SN 0092-2102 J9 INTERFACES JI Interfaces PD JUL-AUG PY 1991 VL 21 IS 4 BP 39 EP 52 DI 10.1287/inte.21.4.39 PG 14 WC Management; Operations Research & Management Science SC Business & Economics; Operations Research & Management Science GA GC627 UT WOS:A1991GC62700005 ER PT J AU KNORR, JB AF KNORR, JB TI SYNTHESIS OF EQUIVALENT-CIRCUITS FOR INDUCTIVE STRIPS IN HOMOGENEOUS FINLINE - W/B = 1 SO INTERNATIONAL JOURNAL OF MICROWAVE AND MILLIMETER-WAVE COMPUTER-AIDED ENGINEERING LA English DT Article ID PLANE AB This article describes a procedure for synthesizing equivalent circuits for inductive strips in homogeneous finline with W/b = 1. Values of strip scattering coefficients predicted by the circuit model are shown to be in excellent agreement with the scattering coefficients predicted by a spectral domain electromagnetic model. RP KNORR, JB (reprint author), USN,POSTGRAD SCH,DEPT ELECT & COMP ENGN,MONTEREY,CA 93943, USA. NR 7 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 1050-1827 J9 INT J MICROWAVE MILL JI Int. J. Microw. Millimeter-Wave Comput.-Aided Eng. PD JUL PY 1991 VL 1 IS 3 BP 306 EP 325 DI 10.1002/mmce.4570010308 PG 20 WC Computer Science, Interdisciplinary Applications; Engineering, Electrical & Electronic SC Computer Science; Engineering GA FR783 UT WOS:A1991FR78300006 ER PT J AU HAHN, TA AF HAHN, TA TI THERMAL-EXPANSION OF TIAL+TIB2 ALLOYS AND MODEL-CALCULATIONS OF STRESSES AND EXPANSION OF CONTINUOUS FIBER COMPOSITES SO INTERNATIONAL JOURNAL OF THERMOPHYSICS LA English DT Article; Proceedings Paper CT 10TH INTERNATIONAL SYMP ON THERMAL EXPANSION CY JUN 06-07, 1989 CL BOULDER, CO SP NIST DE CONTINUOUS FIBER COMPOSITES; STRESS STRAIN CALCULATIONS; THERMAL EXPANSION; TIAL+TIB2 ALLOYS AB Thermal expansion values for three TiAl alloys with different additions of TiB2 can be represented using a third-order equation at temperatures between 20 and 800-degrees-C. Expansion values were obtained on both heating and cooling temperature cycles. The total expansion at 800-degrees-C is between 0.917 and 0.931% for three different samples. The expansivity increases from about 10 x 10(-6) degrees-C-1 at 80-degrees-C to 14 x 10(-6) degrees-C-1 at 750-degrees-C. A five-coaxial cylinder elastic model for multizone-coated continuous fiber composites is developed for predicting stresses and thermal expansion of composites. Either isotropic or transversely isotropic material properties can be assigned to the various cylinder zones. RP HAHN, TA (reprint author), USN,RES LAB,COMPOSITES & CERAM BRANCH,WASHINGTON,DC 20375, USA. NR 2 TC 8 Z9 8 U1 0 U2 2 PU PLENUM PUBL CORP PI NEW YORK PA 233 SPRING ST, NEW YORK, NY 10013 SN 0195-928X J9 INT J THERMOPHYS JI Int. J. Thermophys. PD JUL PY 1991 VL 12 IS 4 BP 711 EP 722 DI 10.1007/BF00534226 PG 12 WC Thermodynamics; Chemistry, Physical; Mechanics; Physics, Applied SC Thermodynamics; Chemistry; Mechanics; Physics GA FV873 UT WOS:A1991FV87300012 ER PT J AU KELSO, JM AF KELSO, JM TI DELAYED FOOD REACTIONS IN ATOPIC-DERMATITIS SO JOURNAL OF ALLERGY AND CLINICAL IMMUNOLOGY LA English DT Letter ID HYPERSENSITIVITY RP KELSO, JM (reprint author), USN HOSP,SAN DIEGO,CA 92134, USA. NR 3 TC 0 Z9 0 U1 0 U2 0 PU MOSBY-YEAR BOOK INC PI ST LOUIS PA 11830 WESTLINE INDUSTRIAL DR, ST LOUIS, MO 63146-3318 SN 0091-6749 J9 J ALLERGY CLIN IMMUN JI J. Allergy Clin. Immunol. PD JUL PY 1991 VL 88 IS 1 BP 140 EP 140 DI 10.1016/0091-6749(91)90314-E PG 1 WC Allergy; Immunology SC Allergy; Immunology GA FY204 UT WOS:A1991FY20400019 PM 2071780 ER PT J AU CONE, EJ WELCH, P PAUL, BD MITCHELL, JM AF CONE, EJ WELCH, P PAUL, BD MITCHELL, JM TI FORENSIC DRUG-TESTING FOR OPIATES .3. URINARY-EXCRETION RATES OF MORPHINE AND CODEINE FOLLOWING CODEINE ADMINISTRATION SO JOURNAL OF ANALYTICAL TOXICOLOGY LA English DT Article ID POPPY SEEDS; CONSUMPTION; DEMETHYLATION; HYDROXYLATION; INGESTION AB The urinary excretion profile of free and conjugated codeine and morphine was determined by GC/MS for four healthy male subjects after intramuscular administration of 60- and 120-mg doses of codeine. Codeine and metabolites were rapidly excreted with the majority of drug appearing in the first 24 h. No dose-related differences in metabolism were observed. The initial ratio of total codeine to total morphine was substantially greater than 1.0 but declined over time. For two of the four subjects, the codeine-morphine ratio declined below 1.0 late in the elimination phase. With a 300-ng/mL cutoff, one subject tested positive on more than one occasion for total morphine and negative for codeine during the terminal elimination phase. The data Indicate that urine codeine-morphine ratios are not reliable indices of the type of opiate exposure. C1 USN,DRUG SCREENING LAB,NORFOLK,VA 23511. RP CONE, EJ (reprint author), NIDA,ADDICT RES CTR,POB 5180,BALTIMORE,MD 21224, USA. NR 28 TC 61 Z9 62 U1 1 U2 8 PU PRESTON PUBLICATIONS INC PI NILES PA 7800 MERRIMAC AVE PO BOX 48312, NILES, IL 60648 SN 0146-4760 J9 J ANAL TOXICOL JI J. Anal. Toxicol. PD JUL-AUG PY 1991 VL 15 IS 4 BP 161 EP 166 PG 6 WC Chemistry, Analytical; Toxicology SC Chemistry; Toxicology GA FX674 UT WOS:A1991FX67400001 PM 1943064 ER PT J AU NEEDLEMAN, SB GOODIN, K SEVERINO, W AF NEEDLEMAN, SB GOODIN, K SEVERINO, W TI LIQUID-LIQUID-EXTRACTION SYSTEMS FOR THC-COOH AND BENZOYLECGONINE SO JOURNAL OF ANALYTICAL TOXICOLOGY LA English DT Article ID URINE AB Because DuPont Instruments has discontinued commercial availability of the PREP automated sample processor, an alternate method for the general extraction of THC-COOH and benzoylecgonine from a urine matrix in the military drug screening laboratories' standard procedure is needed. The liquid-liquid extraction method presented for isolation of THC-COOH uses extraction with isobutanol-hexane followed by back extraction into an aqueous alkaline medium and results in a percent recovery of 104.24 +/- 9.71%. The isolation of benzoylecgonine involves extraction into ethanol-methylene chloride followed by evaporation and derivatization with 1-iodopropane; recovery is 102.43 +/- 3.13%. C1 ST JOHNS UNIV,COLLEGEVILLE,MN 56321. RP NEEDLEMAN, SB (reprint author), USN,DRUG SCREENING LAB,GREAT LAKES,IL 60088, USA. NR 5 TC 11 Z9 12 U1 1 U2 2 PU PRESTON PUBLICATIONS INC PI NILES PA 7800 MERRIMAC AVE PO BOX 48312, NILES, IL 60648 SN 0146-4760 J9 J ANAL TOXICOL JI J. Anal. Toxicol. PD JUL-AUG PY 1991 VL 15 IS 4 BP 179 EP 181 PG 3 WC Chemistry, Analytical; Toxicology SC Chemistry; Toxicology GA FX674 UT WOS:A1991FX67400004 PM 1658491 ER PT J AU RODGERS, E STOUT, J STERANKA, J CHANG, S AF RODGERS, E STOUT, J STERANKA, J CHANG, S TI COMMENT ON TROPICAL CYCLONE-UPPER-ATMOSPHERIC INTERACTION AS INFERRED FROM SATELLITE TOTAL OZONE OBSERVATIONS - REPLY SO JOURNAL OF APPLIED METEOROLOGY LA English DT Note C1 GEN SCI CORP,LAUREL,MD. USN,RES LAB,WASHINGTON,DC 20375. RP RODGERS, E (reprint author), NASA,GODDARD SPACE FLIGHT CTR,ATMOSPHERES LAB,CODE 912,GREENBELT,MD 20771, USA. NR 2 TC 3 Z9 3 U1 0 U2 0 PU AMER METEOROLOGICAL SOC PI BOSTON PA 45 BEACON ST, BOSTON, MA 02108-3693 SN 0894-8763 J9 J APPL METEOROL JI J. Appl. Meteorol. PD JUL PY 1991 VL 30 IS 7 BP 1049 EP 1049 DI 10.1175/1520-0450-30.7.1049 PG 1 WC Meteorology & Atmospheric Sciences SC Meteorology & Atmospheric Sciences GA FX373 UT WOS:A1991FX37300014 ER PT J AU LAU, YY COLOMBANT, DG PILLOFF, MD AF LAU, YY COLOMBANT, DG PILLOFF, MD TI BEAM DIVERGENCE FROM SHARP EMITTERS IN A GENERAL LONGITUDINAL MAGNETIC-FIELD SO JOURNAL OF APPLIED PHYSICS LA English DT Article ID HIGH-CURRENT-DENSITY; ELECTRON-BEAMS; EMITTANCE AB We calculate the trajectories of electrons emitted from a sharp protrusion with corners, where the electric field is intense and the radius of curvature tends to zero. The calculations include the effects of a longitudinal magnetic field but ignore the space-charge effects. We find that the arbitrarily large electric field at a mathematically sharp corner does not necessarily impart to the electrons an excessive amount of transverse momentum, whether or not the external magnetic field is present. Scaling laws are derived for the beam's transverse displacement in terms of macroscopic quantities, such as anode-cathode voltage drop, gap separation, magnetic field, and the protrusion dimensions. The implication of these findings on the electron sources generated from microtips is addressed. C1 OXON HILL HIGH SCH,OXON HILL,MD 20745. RP LAU, YY (reprint author), USN,RES LAB,DIV PLASMA PHYS,BEAM PHYS BRANCH,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 0021-8979 J9 J APPL PHYS JI J. Appl. Phys. PD JUL 1 PY 1991 VL 70 IS 1 BP 4 EP 12 DI 10.1063/1.350259 PG 9 WC Physics, Applied SC Physics GA FV069 UT WOS:A1991FV06900002 ER PT J AU BATES, SE SHIEH, CY MICKLEY, LA DICHEK, HL GAZDAR, A LORIAUX, DL FOJO, AT AF BATES, SE SHIEH, CY MICKLEY, LA DICHEK, HL GAZDAR, A LORIAUX, DL FOJO, AT TI MITOTANE ENHANCES CYTOTOXICITY OF CHEMOTHERAPY IN CELL-LINES EXPRESSING A MULTIDRUG RESISTANCE GENE (MDR-1/P-GLYCOPROTEIN) WHICH IS ALSO EXPRESSED BY ADRENOCORTICAL CARCINOMAS SO JOURNAL OF CLINICAL ENDOCRINOLOGY & METABOLISM LA English DT Article ID ADRENAL-CORTICAL CARCINOMA; BACTERIAL TRANSPORT PROTEINS; HUMAN-LEUKEMIC LYMPHOBLASTS; CALCIUM-CHANNEL BLOCKERS; P-GLYCOPROTEIN GENE; HUMAN CANCER-CELLS; MEMBRANE-VESICLES; DRUG-RESISTANCE; ADRIAMYCIN; MECHANISM AB P-Glycoprotein (Pgp), product of the mdr-1 gene, is a 130- to 180-kDa plasma membrane phosphoglycoprotein which mediates multidrug resistance in cell culture by increasing efflux of the natural product chemotherapeutic agents. High levels of expression of mdr-1/Pgp are found in both the normal adrenal and adrenocortical cancers. By RNA in situ hybridization the expression in adrenocortical cancer is shown to be widely distributed. The present study demonstrates that decreased drug accumulation mediated by mdr-1/Pgp can be overcome by clinically achieveable concentrations of mitotane (o,p'-DDD). The increase in drug accumulation with the addition of mitotane is due at least in part to a decrease in drug efflux and results in an increase in cytotoxicity when agents of the natural product class are used. This effect is observed in cells with a broad range of mdr-1/Pgp expression, including levels comparable to those found in most adrenocortical cancers. Similar increases in drug accumulation can be demonstrated in an unselected adrenocortical cancer cell line that expresses mdr-1/Pgp. The finding that multidrug resistance mediated by mdr-1/Pgp can be reversed by mitotane provides a rational basis for exploring the use of mitotane in combination with natural product chemotherapeutic agents in adrenocortical cancer. C1 NCI, USN, MED ONCOL BRANCH, BETHESDA, MD 20892 USA. NICHHD, DEV ENDOCRINOL BRANCH, BETHESDA, MD 20892 USA. RP BATES, SE (reprint author), NCI, MED BRANCH, BLDG 10, ROOM 12N226, BETHESDA, MD 20892 USA. NR 48 TC 61 Z9 64 U1 0 U2 0 PU ENDOCRINE SOC PI CHEVY CHASE PA 8401 CONNECTICUT AVE, SUITE 900, CHEVY CHASE, MD 20815-5817 USA SN 0021-972X J9 J CLIN ENDOCR METAB JI J. Clin. Endocrinol. Metab. PD JUL PY 1991 VL 73 IS 1 BP 18 EP 29 PG 12 WC Endocrinology & Metabolism SC Endocrinology & Metabolism GA FR758 UT WOS:A1991FR75800004 PM 1675220 ER PT J AU YOTIS, WW SHARMA, VK GOPALSAMI, C CHEGINI, S MCNULTY, J HOERMAN, K KEENE, J SIMONSON, LG AF YOTIS, WW SHARMA, VK GOPALSAMI, C CHEGINI, S MCNULTY, J HOERMAN, K KEENE, J SIMONSON, LG TI BIOCHEMICAL-PROPERTIES OF THE OUTER-MEMBRANE OF TREPONEMA-DENTICOLA SO JOURNAL OF CLINICAL MICROBIOLOGY LA English DT Article ID POLYACRYLAMIDE GEL-ELECTROPHORESIS; BICINCHONINIC ACID; DETECTING PROTEINS; ORAL SPIROCHETE; SILVER STAIN; HETEROGENEITY; RESOLUTION; PALLIDUM; ENVELOPE; ANTIGEN AB The outer membranes (OMs) from serovars a, b, and c of Treponema denticola, originally isolated from periodontal patients, were prepared. Dialysis of the OMs against 20 mM MgCl2 yielded the aggregable (A) and the nonaggregable (NA) moieties of the OMs. The absence of muramic acid, adenosine triphosphatase, hexokinase, and nucleic acid as well as electron microscopy indicated that the OM preparations were homogeneous. Sodium dodecyl sulfate-polyacrylamide gel electrophoresis of the A and NA moieties of the OMs showed approximately 25 Coomassie brilliant blue R-250 stain-positive bands or 47 silver-stained polypeptides. The relative molecular masses ranged between 14 and 97 kDa. The electrophoretic polypeptide profiles of the A and NA moieties shared many similarities among serovars a, b, and c. However, they exhibited variation in the overall pattern, intensity, or location of the polypeptide stained zones. This was especially true for serovar b. Two-dimensional electrophoretic studies showed an excess of 100 silver-stained spots with isoelectric points of 4.6 to 7.0 and relative molecular masses in the 14- to 97-kDa range. The OMs contained simple proteins, glycoproteins, and lipoproteins. The NA moieties of the OMs contained 4 to 6, 10 to 12, and 4 to 6 glycopeptides as well as two, seven, and two lipoprotein bands for serovars a, b, and c, respectively. The A moieties of the OMs showed 7 to 9, 11 to 13 and 5 to 6 glycopeptides as well as four, five, and three lipoprotein bands for serovars a, b, and c, respectively. Lipopolysaccharide was detected in the OMs of the three serovars following removal of proteins with proteinase K, pronase and silver staining of sodium dodecyl sulfate-polyacrylamide gels, or removal of lipopolysaccharide from the OMs by hot phenol extraction. The 66- and 53-kDa bands were present in serovars b and c, while a band with a relative molecular mass of 45 kDa was present only in serovar c. Endotoxin-like activity was also shown in the OMs of the three serovars by the Limulus amebocyte clotting assay and the chick embryo lethality test. This is the first report on selected biochemical properties of the OM macromolecules of three known serovars of T. denticola. C1 LOYOLA UNIV,MED CTR,DEPT ANAT,MAYWOOD,IL 60153. LOYOLA UNIV,MED CTR,DEPT PERIODONT,MAYWOOD,IL 60153. USN,DENT RES INST,GREAT LAKES,IL 60088. RP YOTIS, WW (reprint author), LOYOLA UNIV,MED CTR,DEPT MICROBIOL,MAYWOOD,IL 60153, USA. NR 42 TC 26 Z9 27 U1 0 U2 0 PU AMER SOC MICROBIOLOGY PI WASHINGTON PA 1325 MASSACHUSETTS AVENUE, NW, WASHINGTON, DC 20005-4171 SN 0095-1137 J9 J CLIN MICROBIOL JI J. Clin. Microbiol. PD JUL PY 1991 VL 29 IS 7 BP 1397 EP 1406 PG 10 WC Microbiology SC Microbiology GA FT634 UT WOS:A1991FT63400026 PM 1715883 ER PT J AU OLSON, JG SCOTT, TW LORENZ, LH HUBBARD, JL AF OLSON, JG SCOTT, TW LORENZ, LH HUBBARD, JL TI ENZYME-IMMUNOASSAY FOR DETECTION OF ANTIBODIES AGAINST EASTERN EQUINE ENCEPHALOMYELITIS VIRUS IN SENTINEL CHICKENS SO JOURNAL OF CLINICAL MICROBIOLOGY LA English DT Article ID LINKED IMMUNOSORBENT-ASSAY; ENCEPHALITIS-VIRUS; MOSQUITO POOLS; ANTIGEN; BIRDS; USA; EIA AB We developed an enzyme immunoassay (EIA) for the detection of immunoglobulin M (IgM) and IgG subclass antibodies directed against eastern equine encephalomyelitis (EEE) virus in chickens. The assays were compared with the serum plaque reduction neutralization test (PRNT) and the hemaglutination inhibition (HI) test for ability to detect antibodies against EEE virus in laboratory-infected birds. No cross-reactivity was detected in serum from chickens inoculated with St. Louis encephalitis or Highlands J virus. The interval after infection when EEE virus-specific antibodies were first detected by IgM and IgG EIAs was found to be similar to that determined by the PRNT and HI tests: 2 to 4 days. The IgG EIA, PRNT, and HI test detected antibodies to EEE virus for at least 27 to 30 days after inoculation. In contrast, serum from five of seven chickens did not contain detectable IgM 30 days after infection. Similarly, in all three naturally infected sentinel chickens from Maryland, IgM class antibody was undetectable 1 to 5 weeks after IgM was intially detected. EIAs provide simple and rapid alternatives to traditional tests for monitoring EEE virus infections in sentinel chicken flocks. Moreover, the IgM EIA provides a means to separate recently infected chickens from those infected greater-than-or-equal-to 1 month earlier. C1 UNIV MARYLAND,DEPT ENTOMOL,COLLEGE PK,MD 20742. UNIV MARYLAND,CTR AGR BIOTECHNOL,COLLEGE PK,MD 20742. USN,MED COMMAND,MED RES INST,BETHESDA,MD 20814. FU PHS HHS [A126787, A122119] NR 19 TC 14 Z9 14 U1 0 U2 0 PU AMER SOC MICROBIOLOGY PI WASHINGTON PA 1325 MASSACHUSETTS AVENUE, NW, WASHINGTON, DC 20005-4171 SN 0095-1137 J9 J CLIN MICROBIOL JI J. Clin. Microbiol. PD JUL PY 1991 VL 29 IS 7 BP 1457 EP 1461 PG 5 WC Microbiology SC Microbiology GA FT634 UT WOS:A1991FT63400035 PM 1885741 ER PT J AU NOEL, KR AF NOEL, KR TI CONTROVERSY IN AUTOMATED RECORD KEEPING SO JOURNAL OF CLINICAL MONITORING LA English DT Letter RP NOEL, KR (reprint author), NAVAL HOSP,DEPT ANESTHESIOL,JACKSONVILLE,FL 32214, USA. NR 0 TC 3 Z9 3 U1 0 U2 0 PU KLUWER ACADEMIC PUBL PI DORDRECHT PA SPUIBOULEVARD 50, PO BOX 17, 3300 AA DORDRECHT, NETHERLANDS SN 0748-1977 J9 J CLIN MONITOR JI J. Clin. Monit. PD JUL PY 1991 VL 7 IS 3 BP 280 EP 280 DI 10.1007/BF01619277 PG 1 WC Anesthesiology SC Anesthesiology GA FX656 UT WOS:A1991FX65600016 PM 1760028 ER PT J AU WILLIAMS, RW LOWREY, AH AF WILLIAMS, RW LOWREY, AH TI EFFECTS OF HYDRATION ON SCALE FACTORS FOR ABINITIO FORCE-CONSTANTS SO JOURNAL OF COMPUTATIONAL CHEMISTRY LA English DT Article ID INTERMOLECULAR POTENTIAL FUNCTIONS; ALA-X PEPTIDES; COUNTERPOISE CORRECTIONS; VIBRATIONAL FREQUENCIES; RAMAN-SPECTRA; ACID MONOMERS; FIELD; MOLECULES; ENERGY; DIMERS AB Experimentally measured vibrational frequencies from the polar groups of peptides in aqueous solutions do not agree with frequencies calculated from scaled quantum mechanical force fields (SQMFF) using differential scale factors developed for molecules in the vapor phase. Measured stretching frequencies for carbonyl groups are more than 50 wavenumbers lower than the calculated values. On the other hand, frequencies for non-polar groups calculated using these scale factors are relatively accurate. Our goal is to develop a SQMFF that yields accurate calculated frequencies for peptides in aqueous solutions. To this end, we have calculated scale factors for ab initio force constants for formic acid, acetic acid, and acetone using a least squares fit of calculated and experimental frequencies. We compare these scale factors with changes observed in the ab initio force constants calculated for these molecules at various states of hydration. These force constants are calculated using fully optimized geometries for these hydrated molecules using the 4-31G basis. We present a comparison of the experimental and calculated frequencies, along with their potential energy distributions, for both vapor and aqueous phases. The results indicate that scale factors can simulate the effects of solvation on molecular force constants to yield accurate scaled ab initio force fields. C1 USN,RES LAB,STRUCT MATTER LAB,WASHINGTON,DC 20375. RP WILLIAMS, RW (reprint author), UNIFORMED SERV UNIV HLTH SCI,DEPT BIOCHEM,4301 JONES BRIDGE RD,BETHESDA,MD 20814, USA. NR 28 TC 33 Z9 33 U1 1 U2 1 PU JOHN WILEY & SONS INC PI NEW YORK PA 605 THIRD AVE, NEW YORK, NY 10158-0012 SN 0192-8651 J9 J COMPUT CHEM JI J. Comput. Chem. PD JUL-AUG PY 1991 VL 12 IS 6 BP 761 EP 777 DI 10.1002/jcc.540120614 PG 17 WC Chemistry, Multidisciplinary SC Chemistry GA FU124 UT WOS:A1991FU12400013 ER PT J AU GROSSKREUTZ, S GOFF, WB BALSARA, Z BURKHARD, TK AF GROSSKREUTZ, S GOFF, WB BALSARA, Z BURKHARD, TK TI CT OF THE NORMAL APPENDIX SO JOURNAL OF COMPUTER ASSISTED TOMOGRAPHY LA English DT Article DE APPENDIX, ANATOMY; COMPUTED TOMOGRAPHY; APPENDICITIS ID DIAGNOSIS AB We conducted a prospective evaluation of the normal vermiform appendix in 203 patients. Conventional CT techniques were utilized with an 8 mm slice thickness and 10 mm slice interval. The normal appendix was definitely identified in 51% of the patients studied. Computed tomographic appearance of the normal appendix is demonstrated, and potential pitfalls are described. C1 USN HOSP,DEPT CLIN INVEST,SAN DIEGO,CA 92134. USN HOSP,DEPT RADIOL,SAN DIEGO,CA 92134. NR 8 TC 24 Z9 25 U1 0 U2 1 PU LIPPINCOTT-RAVEN PUBL PI PHILADELPHIA PA 227 EAST WASHINGTON SQ, PHILADELPHIA, PA 19106 SN 0363-8715 J9 J COMPUT ASSIST TOMO JI J. Comput. Assist. Tomogr. PD JUL-AUG PY 1991 VL 15 IS 4 BP 575 EP 577 DI 10.1097/00004728-199107000-00009 PG 3 WC Radiology, Nuclear Medicine & Medical Imaging SC Radiology, Nuclear Medicine & Medical Imaging GA FW322 UT WOS:A1991FW32200009 PM 2061470 ER PT J AU SNAIL, KA HANSSEN, LM AF SNAIL, KA HANSSEN, LM TI HIGH-TEMPERATURE, HIGH-RATE HOMOEPITAXIAL GROWTH OF DIAMOND IN AN ATMOSPHERIC-PRESSURE FLAME SO JOURNAL OF CRYSTAL GROWTH LA English DT Article ID HYDROGEN CHEMISORPTION; DEPOSITION; POWDERS; SURFACE AB Homoepitaxial growth of diamond at temperatures in the range of 1150-1500-degrees-C has been achieved on millimeter sized {100} and {110} natural diamond seed crystals using a laminar, premixed oxygen-acetylene flame in air. Growth rates of 100-200-mu-m/h have been observed. Microscope and naked eye observations show the original cylindrical shaped seed crystals growing into polyhedral shaped crystals with identifiable {100}, {110} and {111} faces. Examination under optical and scanning electron microscopes reveals terraces on the {100} faces. The deposited diamond is clear and exhibits Raman spectra almost identical to that of natural diamond. Laue X-ray diffraction analyses have confirmed the epitaxial nature of the growth. The deposition temperatures and growth rates reported are the highest ever observed for the homoepitaxial synthesis of diamond crystals at low pressures. RP USN, RES LAB, DIV OPT SCI, WASHINGTON, DC 20375 USA. NR 36 TC 44 Z9 44 U1 0 U2 4 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0022-0248 EI 1873-5002 J9 J CRYST GROWTH JI J. Cryst. Growth PD JUL PY 1991 VL 112 IS 4 BP 651 EP 659 DI 10.1016/0022-0248(91)90121-K PG 9 WC Crystallography; Materials Science, Multidisciplinary; Physics, Applied SC Crystallography; Materials Science; Physics GA GA813 UT WOS:A1991GA81300006 ER PT J AU HALL, EH AF HALL, EH TI ZEBRA VII .2. SO JOURNAL OF ENDODONTICS LA English DT Article RP HALL, EH (reprint author), USN,SCH DENT,DEPT MED,NATL NAVAL DENT CTR,BETHESDA,MD 20814, USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU WILLIAMS & WILKINS PI BALTIMORE PA 351 WEST CAMDEN ST, BALTIMORE, MD 21201-2436 SN 0099-2399 J9 J ENDODONT JI J. Endod. PD JUL PY 1991 VL 17 IS 7 BP 350 EP 352 PG 3 WC Dentistry, Oral Surgery & Medicine SC Dentistry, Oral Surgery & Medicine GA FU298 UT WOS:A1991FU29800011 PM 1779222 ER PT J AU LEWIS, DE AF LEWIS, DE TI ELIMINATION OF THE PATIENTS RACE FROM THE CASE PRESENTATION SO JOURNAL OF GENERAL INTERNAL MEDICINE LA English DT Letter RP LEWIS, DE (reprint author), USN HOSP,DEPT INTERNAL MED,SAN DIEGO,CA 92134, USA. NR 0 TC 1 Z9 1 U1 0 U2 0 PU BLACKWELL SCIENCE INC PI CAMBRIDGE PA 238 MAIN ST, CAMBRIDGE, MA 02142 SN 0884-8734 J9 J GEN INTERN MED JI J. Gen. Intern. Med. PD JUL-AUG PY 1991 VL 6 IS 4 BP 382 EP 382 DI 10.1007/BF02597443 PG 1 WC Health Care Sciences & Services; Medicine, General & Internal SC Health Care Sciences & Services; General & Internal Medicine GA FX368 UT WOS:A1991FX36800020 PM 1890514 ER PT J AU BURKHART, GR DRAKE, JF CHEN, J AF BURKHART, GR DRAKE, JF CHEN, J TI STRUCTURE OF THE DISSIPATION REGION DURING MAGNETIC RECONNECTION IN COLLISIONLESS PLASMA SO JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS LA English DT Article ID SHEET BOUNDARY-LAYER; GEOMAGNETIC TAIL; SUBSTORM ONSET; INSTABILITY; FIELD; DYNAMICS; DISTRIBUTIONS; CONDUCTIVITY; POINTS; MODELS AB The results of an analytic and numerical investigation of the structure of the X line during steady state magnetic reconnection in collisionless plasma are presented. The structure of the X line essentially depends on a single dimensionless parameter F, which is a measure of the influx of plasma into the reconnection region. For small F the self-consistent plasma current driven at the X line is small, and the magnetic fields are nearly unchanged from the initial vacuum state. With increasing F the current driven at the X line becomes large, and the dissipation region collapses in the direction of the inflow and elongates along the outflow. For sufficiently large F the velocity of the plasma ejected from the X line exceeds the local Alfven velocity. In this regime a fast mode shock forms at the outflow end of the dissipation region which slows the high-velocity outflow plasma to the subsonic flow characteristic of the broader outflow region. Finally, at a critical plasma flux F(c) the dissipation region collapses to zero thickness; no steady solutions are found for F > F(c). By matching the energy dissipated at the neutral line with the change in global magnetic energy, a self-consistent equation for F is derived which indicates that F always adjusts so that F similar-to-or-less-than F(c). Predictions of reconnection rates and associated parameters for the geomagnetic tail are presented which are in reasonable agreement with observations. C1 USN,RES LAB,DIV PLASMA PHYS,SPACE PLASMA BRANCH,WASHINGTON,DC 20375. UNIV MARYLAND,INST PHYS SCI & TECHNOL,COLLEGE PK,MD 20742. UNIV MARYLAND,PLASMA RES LAB,COLLEGE PK,MD 20742. NR 36 TC 30 Z9 30 U1 0 U2 3 PU AMER GEOPHYSICAL UNION PI WASHINGTON PA 2000 FLORIDA AVE NW, WASHINGTON, DC 20009 SN 0148-0227 J9 J GEOPHYS RES JI J. Geophys. Res-Space Phys. PD JUL 1 PY 1991 VL 96 IS A7 BP 11539 EP 11553 DI 10.1029/91JA00893 PG 15 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA FW171 UT WOS:A1991FW17100047 ER PT J AU GERBINO, PG SALDANA, MJ WESTERBECK, P SCHACHERER, TG AF GERBINO, PG SALDANA, MJ WESTERBECK, P SCHACHERER, TG TI COMPLICATIONS EXPERIENCED IN THE REHABILITATION OF ZONE-I FLEXOR TENDON INJURIES WITH DYNAMIC TRACTION SPLINTING SO JOURNAL OF HAND SURGERY-AMERICAN VOLUME LA English DT Article AB A retrospective review of all flexor tendon repairs done between January 1985 to June 1987 determined the complication rate with our method of rehabilitation. One hundred sixty-three flexor tendon lacerations in 83 patients were reviewed. Follow-up ranged from 6 to 42 months. All patients participated in the same 12-week rehabilitation protocol. All patients had passive motion exercises of the interphalangeal joints in the first 2 weeks. We believe that passive stretching of zone I injuries during the first 2 weeks contributed to the zone I complication rate. Of the 20 patients with zone I tendon-to-tendon repairs, 7 patients had significant complications. The 35% complication rate found with zone I injuries has prompted us to modify our postoperative rehabilitation protocol in zone I injuries. C1 USN,HOSP PORTSMOUTH,DEPT ORTHOPAED,DIV HAND SURG,PORTSMOUTH,VA 23708. NR 0 TC 12 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 0363-5023 J9 J HAND SURG-AM JI J. Hand Surg.-Am. Vol. PD JUL PY 1991 VL 16A IS 4 BP 680 EP 686 DI 10.1016/0363-5023(91)90194-G PG 7 WC Orthopedics; Surgery SC Orthopedics; Surgery GA FW765 UT WOS:A1991FW76500019 PM 1880366 ER PT J AU BUSSE, LE AGGARWAL, ID AF BUSSE, LE AGGARWAL, ID TI DESIGN PARAMETERS FOR FLUORIDE MULTIMODE FIBERS SO JOURNAL OF LIGHTWAVE TECHNOLOGY LA English DT Article AB Numerical calculations of losses due to polymer coatings and macrobending have been made for step-index multimode fluoride fibers. To minimize such losses, fiber parameters must be chosen to give a large value for V, the normalized frequency. Due to the long propagation wavelength (2.5-mu-m) for fluoride fiber, the parameters needed are very different from those of silica fiber. It will be shown that in order to have reasonable cladding thicknesses and minimal bending losses, it is beneficial for a given value of V to maximize the numerical aperture and minimize the core diameter. C1 USN,RES LAB,NONOXIDE MAT SECT,WASHINGTON,DC 20375. RP BUSSE, LE (reprint author), USN,RES LAB,DIV OPT SCI,CODE 6505,WASHINGTON,DC 20375, USA. NR 6 TC 1 Z9 1 U1 1 U2 1 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0733-8724 J9 J LIGHTWAVE TECHNOL JI J. Lightwave Technol. PD JUL PY 1991 VL 9 IS 7 BP 828 EP 831 DI 10.1109/50.85781 PG 4 WC Engineering, Electrical & Electronic; Optics; Telecommunications SC Engineering; Optics; Telecommunications GA FU125 UT WOS:A1991FU12500003 ER PT J AU SHANKAR, PM BOBB, LC KRUMBOLTZ, HD AF SHANKAR, PM BOBB, LC KRUMBOLTZ, HD TI COUPLING OF MODES IN BENT BICONICALLY TAPERED SINGLE-MODE FIBERS SO JOURNAL OF LIGHTWAVE TECHNOLOGY LA English DT Article ID DIELECTRIC WAVEGUIDES; OPTICAL FIBERS; COUPLERS AB Biconically tapered single-mode fibers are fabricated by heating a single-mode fiber while applying tension. As a result of this tapering, cladding modes are excited in the tapered region of the fiber where the V parameter of the fiber goes down below 1.0. These cladding modes couple to one another leading to fluctuations of the optical throughout. Since the index difference between the cladding and the external medium is rather high (approximately 0.5), the cladding modes will be of the exact type, namely, TE, TM, HE, and EH modes. The coupling of these modes in the tapered region is analyzed using the exact mode formalism when the tapered region is bent. The theoretical results agree very well with the experimental results obtained on bent tapers which show strong fluctuations of the optical power as a function of the bending angle. Bent tapered fibers have been shown to be useful in a number of applications involving fiber-optic sensors. C1 USN,AERONAUT ELECTR & ELECT LAB,DIV RADAR,CODE 5012,WARMINSTER,PA 18974. RP SHANKAR, PM (reprint author), DREXEL UNIV,DEPT ELECT & COMP ENGN,PHILADELPHIA,PA 19104, USA. OI shankar, P/0000-0002-9719-9700 NR 21 TC 30 Z9 30 U1 0 U2 5 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0733-8724 J9 J LIGHTWAVE TECHNOL JI J. Lightwave Technol. PD JUL PY 1991 VL 9 IS 7 BP 832 EP 837 DI 10.1109/50.85782 PG 6 WC Engineering, Electrical & Electronic; Optics; Telecommunications SC Engineering; Optics; Telecommunications GA FU125 UT WOS:A1991FU12500004 ER PT J AU SHIN, HJ ARMSTRONG, RW SINGER, IL AF SHIN, HJ ARMSTRONG, RW SINGER, IL TI ROLE FOR PLASTIC-FLOW IN AMBIENT-TEMPERATURE CRACKING BEHAVIOR AT HARDNESS INDENTATIONS IN SILICON-CRYSTALS SO JOURNAL OF MATERIALS SCIENCE LA English DT Article ID FRACTURE; INITIATION; STRESSES; SOLIDS AB New identation hardness measurements on silicon crystals are correlated with previous results obtained over a wide range of load values to analyse the ambient-temperature cracking behaviour. From an elastic-plastic-cracking analysis of the total results, brittle cracking is reasoned to be promoted by any amount of plastic deformation occurring during the initial indenting process. C1 USN, RES LAB, WASHINGTON, DC 20375 USA. RP SHIN, HJ (reprint author), UNIV MARYLAND, COLLEGE PK, MD 20742 USA. NR 16 TC 5 Z9 5 U1 0 U2 0 PU SPRINGER PI NEW YORK PA 233 SPRING ST, NEW YORK, NY 10013 USA SN 0022-2461 EI 1573-4803 J9 J MATER SCI JI J. Mater. Sci. PD JUL 1 PY 1991 VL 26 IS 13 BP 3486 EP 3490 DI 10.1007/BF00557135 PG 5 WC Materials Science, Multidisciplinary SC Materials Science GA FX071 UT WOS:A1991FX07100011 ER PT J AU PRICE, R PATCHAN, M AF PRICE, R PATCHAN, M TI CONTROLLED RELEASE FROM CYLINDRICAL MICROSTRUCTURES SO JOURNAL OF MICROENCAPSULATION LA English DT Article AB Microtubules formed from diacetylenic phosphatidyl-cholines can be made rugged and solvent resistant through electroless deposition of metals (Rudolph et al. 1990). Once dried tubules can capture a range of materials by capillary action when added to a hydrating medium, thus retaining and controlling the release rates of these materials. We report the encapsulation in tubules of a mixture of tetracycline, epoxy monomers and polymers and their in vitro release kinetics in both dynamic and static environments. RP PRICE, R (reprint author), USN,RES LAB,CTR BIOMOLEC SCI & ENGN,CODE 6090,WASHINGTON,DC 20375, USA. NR 0 TC 45 Z9 47 U1 1 U2 3 PU TAYLOR & FRANCIS LTD PI LONDON PA ONE GUNDPOWDER SQUARE, LONDON, ENGLAND EC4A 3DE SN 0265-2048 J9 J MICROENCAPSUL JI J. Microencapsul. PD JUL-SEP PY 1991 VL 8 IS 3 BP 301 EP 306 DI 10.3109/02652049109069556 PG 6 WC Chemistry, Applied; Engineering, Chemical; Pharmacology & Pharmacy SC Chemistry; Engineering; Pharmacology & Pharmacy GA GC997 UT WOS:A1991GC99700003 PM 1941436 ER PT J AU ALLARD, D AF ALLARD, D TI RICKOVER AND THE NUCLEAR NAVY - THE DISCIPLINE OF TECHNOLOGY - DUNCAN,F SO JOURNAL OF MILITARY HISTORY LA English DT Book Review RP ALLARD, D (reprint author), USN,CTR HIST,WASHINGTON,DC 20350, USA. NR 1 TC 0 Z9 0 U1 0 U2 0 PU VIRGINIA MILITARY INST PI LEXINGTON PA LEXINGTON, VA 24450 SN 0899-3718 J9 J MILITARY HIST JI J. Mil. Hist. PD JUL PY 1991 VL 55 IS 3 BP 424 EP 425 DI 10.2307/1985700 PG 2 WC History SC History GA FV764 UT WOS:A1991FV76400020 ER PT J AU BUCKLEY, SL SPONSELLER, PD MAGID, D AF BUCKLEY, SL SPONSELLER, PD MAGID, D TI THE ACETABULUM IN CONGENITAL AND NEUROMUSCULAR HIP INSTABILITY SO JOURNAL OF PEDIATRIC ORTHOPAEDICS LA English DT Article DE ACETABULUM; CEREBRAL PALSY; COMPUTED TOMOGRAPHY; CONGENITAL HIP DYSPLASIA; HIP INSTABILITY; SPINA BIFIDA AB Acetabular morphology in congenital and neuromuscular hip instability was evaluated with computed tomography (CT) and plain radiography. Thirty-three unstable hips in 27 children with congenital hip dysplasia, cerebral palsy, or spina bifida were studied. Fourteen normal hips in 14 children served as controls. Unstable hips in the children with congenital hip dysplasia demonstrated anterior and superior acetabular deficiency with increased acetabular anteversion. Global deficiency was present in acetabuli of cerebral palsy and spina bifida patients with anterior, posterior, and superior deficiencies. The acetabuli in cerebral palsy patients had significant posterior deficiency and were the shallowest of the groups evaluated. RP BUCKLEY, SL (reprint author), USN HOSP,OAKLAND,CA 94627, USA. NR 0 TC 39 Z9 44 U1 0 U2 0 PU LIPPINCOTT-RAVEN PUBL PI PHILADELPHIA PA 227 EAST WASHINGTON SQ, PHILADELPHIA, PA 19106 SN 0271-6798 J9 J PEDIATR ORTHOPED JI J. Pediatr. Orthop. PD JUL-AUG PY 1991 VL 11 IS 4 BP 498 EP 501 PG 4 WC Orthopedics; Pediatrics SC Orthopedics; Pediatrics GA FT159 UT WOS:A1991FT15900015 PM 1860951 ER PT J AU NOCK, LA GOLDWASSER, JM ADOLPH, HG AF NOCK, LA GOLDWASSER, JM ADOLPH, HG TI NITROPOLYFORMALS AND FLUOROPOLYFORMALS .3. COPOLYFORMALS FROM MIXTURES OF FLUOROPOLYFORMALS AND NITRO-ALPHA,OMEGA-DIOLS SO JOURNAL OF POLYMER SCIENCE PART A-POLYMER CHEMISTRY LA English DT Article AB Polyformals of fluoro-, nitramine-, and C-nitrodiols show widely differing properties with respect to glass transition temperature, melting transition, and solubility. Polymers with desirable combinations of these properties, e.g., low T(g), high nitro content, and good solubility in polar solvents, were expected to result from acid-promoted copolycondensation of appropriate mixtures of diols with formaldehyde. A series of such condensations were carried out and the polymers obtained from binary mixtures of fluoro- and nitrodiols, different nitrodiols, and fluoro- or nitrodiols and carboranediols, were characterized by GPC, H-1-NMR, and DSC analysis. C1 USN,CTR SURFACE WARFARE,DIV ENERGET MAT,SILVER SPRING,MD 20903. NR 6 TC 1 Z9 1 U1 0 U2 0 PU JOHN WILEY & SONS INC PI NEW YORK PA 605 THIRD AVE, NEW YORK, NY 10158-0012 SN 0887-624X J9 J POLYM SCI POL CHEM JI J. Polym. Sci. Pol. Chem. PD JUL PY 1991 VL 29 IS 8 BP 1133 EP 1149 DI 10.1002/pola.1991.080290807 PG 17 WC Polymer Science SC Polymer Science GA FT429 UT WOS:A1991FT42900007 ER PT J AU SANDUSKY, HW GLANCY, BC CARLSON, DW ELBAN, WL ARMSTRONG, RW AF SANDUSKY, HW GLANCY, BC CARLSON, DW ELBAN, WL ARMSTRONG, RW TI RELATING DEFORMATION TO HOT-SPOTS IN SHOCK-LOADED CRYSTALS OF AMMONIUM-PERCHLORATE SO JOURNAL OF PROPULSION AND POWER LA English DT Article ID RDX AB The purpose of this work is to perform a microscopic-scale study of the role that crystal defects have in forming hot spots during shock loading of large, optical quality, pure single crystals of ammonium perchlorate (AP). The crystals were immersed in mineral oil at various distances from a detonator that provided the shock. The small explosive donor permitted recovery of the crystals for quantitative chemical analysis of decomposition and microindentation hardness testing. Hardness testing was also performed on an unshocked crystal to determine 1) the slip systems associated with primary and secondary deformation in accommodating the indenter and 2) the crack propagation directions at the surface as well as into the crystal. High-speed photographs of the shock-loaded crystals showed slip and cracking systems identified by hardness testing. Some of the systems were luminous. In addition, when a crystal with a large indentation was shocked near its reaction threshold, significant light appeared in the vicinity of the identation following shock passage. As such, preferred chemical reactivity in AP has been associated with its deformation systems and the presence of large strain centers. C1 UNIV MARYLAND,DEPT MECH ENGN,COLLEGE PK,MD 20742. LOYOLA COLL,DEPT ELECT ENGN & ENGN SCI,BALTIMORE,MD 21210. USN,CTR SURFACE WELFARE,SYNTH & FORMULAT BRANCH,SILVER SPRING,MD 20903. RP SANDUSKY, HW (reprint author), USN,CTR SURFACE WELFARE,DETONAT PHYS BRANCH,SILVER SPRING,MD 20903, USA. NR 20 TC 12 Z9 12 U1 0 U2 2 PU AMER INST AERONAUT ASTRONAUT PI RESTON PA 1801 ALEXANDER BELL DRIVE, STE 500, RESTON, VA 22091 SN 0748-4658 J9 J PROPUL POWER JI J. Propul. Power PD JUL-AUG PY 1991 VL 7 IS 4 BP 518 EP 525 DI 10.2514/3.23357 PG 8 WC Engineering, Aerospace SC Engineering GA FY513 UT WOS:A1991FY51300009 ER PT J AU DOSS, E ROY, G AF DOSS, E ROY, G TI FLOW CHARACTERISTICS INSIDE MHD SEAWATER THRUSTERS SO JOURNAL OF PROPULSION AND POWER LA English DT Article AB A three-dimensional MHD fluid-flow computer model has been developed and applied to study the concept of MHD seawater propulsion. The effects of strong magnetic fields on the current and electrical fields inside the MHD duct and their interaction with the flowfields, particularly those in the boundary layers, have been investigated. Results of parametric studies for variables influencing the flowfield characteristics and the overall performance of the propulsion systems are discussed. Such parameters include the magnetic field and electrical loading of the MHD thruster. The results of the calculations performed indicate the sensitivity of the thruster performance to the load factor and wall friction. The nonuniform distribution of the current density in the Hartmann layers of the insulating sidewalls causes the flattening of the velocity profiles on the sidewalls relative to the velocity profiles over the electrode walls. These nonuniformities in the flowfield give rise to nonuniform distribution of the skin friction along the walls of the thrusters, where higher values are predicted over the sidewalls relative to those over the electrode walls. Although the discrepancies of the velocity profiles between the different walls of the MHD thruster are not significant, careful considerations should be given to the calculation of the frictional losses because of their adverse effect on the electrical efficiency of the thruster. C1 OFF NAVAL RES,ARLINGTON,VA 22217. RP DOSS, E (reprint author), ARGONNE NATL LAB,DIV ENGN PHYS,ARGONNE,IL 60439, USA. NR 12 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 JUL-AUG PY 1991 VL 7 IS 4 BP 635 EP 641 DI 10.2514/3.23372 PG 7 WC Engineering, Aerospace SC Engineering GA FY513 UT WOS:A1991FY51300024 ER PT J AU DEFREITAS, EA DUDZINSKI, MR LAROCQUE, JC CODDINGTON, CC AF DEFREITAS, EA DUDZINSKI, MR LAROCQUE, JC CODDINGTON, CC TI OVARIAN VEIN SAMPLING IN RAPIDLY PROGRESSING VIRILIZATION - A CASE-REPORT SO JOURNAL OF REPRODUCTIVE MEDICINE LA English DT Article ID CELL AB A woman presented with progressive hirsutism, deepening of the voice, clitoromegaly and increased libido. The preoperative serum testosterone level was 2,042 ng/dL. The intraoperative ovarian venous blood testosterone levels were 56,327 ng/dL on the left and 1,417 on the right. After a bilateral salpingo-oophorectomy, the serum testosterone level was 20.7 ng/dL. Initial pathologic examination of the ovaries revealed no potential source of testosterone, but reexamination revealed a pure lipoid cell tumor. Intraoperative ovarian vein androgen measurements can be helpful in establishing a histopathologic diagnosis in cases of microscopic virilizing ovarian neoplasms. Ovarian vein sampling for androgen was essential in locating this patient's microscopic tumor. C1 USN HOSP,DEPT OBSTET & GYNECOL,PORTSMOUTH,VA. NR 14 TC 9 Z9 9 U1 0 U2 0 PU SCI PRINTERS & PUBL INC PI ST LOUIS PA P.O. DRAWER 12425 8342 OLIVE BLVD, ST LOUIS, MO 63132 SN 0024-7758 J9 J REPROD MED JI J. Reprod. Med. PD JUL PY 1991 VL 36 IS 7 BP 546 EP 548 PG 3 WC Obstetrics & Gynecology SC Obstetrics & Gynecology GA FX659 UT WOS:A1991FX65900022 PM 1941793 ER PT J AU ABBOTT, JR TETLOW, N GRAHAM, AL ALTOBELLI, SA FUKUSHIMA, E MONDY, LA STEPHENS, TS AF ABBOTT, JR TETLOW, N GRAHAM, AL ALTOBELLI, SA FUKUSHIMA, E MONDY, LA STEPHENS, TS TI EXPERIMENTAL-OBSERVATIONS OF PARTICLE MIGRATION IN CONCENTRATED SUSPENSIONS - COUETTE-FLOW SO JOURNAL OF RHEOLOGY LA English DT Article ID SPHERES AB Nuclear magnetic resonance (NMR) imaging was used to observe the evolution of radial concentration and velocity profiles of initially well-mixed concentrated suspensions of spheres in viscous Newtonian liquids undergoing flow between rotating concentric cylinders (wide-gap, annular Couette flow). In Couette flow, particles migrate from the high shear-rate region near the inner rotating cylinder to the low shear-rate region at the outer wall. The particle concentration near the outer wall approaches maximum packing for randomly distributed spheres at steady state, and velocity profiles reveal that the suspension is almost stagnant in these regions. For unimodal suspensions of spheres, the shear-induced migration of large particles results in concentric two-dimensional, circular sheets of particles arranged in hexgonal close-packed arrangements extending inward from the outer wall. This paper examines the functional dependence of particle migration in concentrated suspensions undergoing shear flow in a wide-gap Couette. The primary experimental parameters were strain, shear rate, viscosity of the suspending liquid, particle diameter, and degree of polydispersivity of the particle phase. The particle migration is irreversible, even under creeping flow conditions, and is a function of total strain. Particle migration rate increases with the mean particle diameter raised to 2.7 +/- 0.3 for sieved samples and 2.5 +/- 0.3 for unsieved samples. The particle migration does not depend on the strain rate nor on the suspending liquid viscosity. The migration rate was found to depend only weakly on the polydispersivity of the particulate phase. C1 LOVELACE FDN MED EDUC & RES,ALBUQUERQUE,NM 87108. SANDIA NATL LABS,ALBUQUERQUE,NM 87185. USN,CTR WEAP,CHINA LAKE,CA 93555. RP ABBOTT, JR (reprint author), UNIV CALIF LOS ALAMOS SCI LAB,LOS ALAMOS,NM 87545, USA. RI Stephens, Thomas/D-9512-2012 NR 16 TC 202 Z9 204 U1 1 U2 19 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0148-6055 J9 J RHEOL JI J. Rheol. PD JUL PY 1991 VL 35 IS 5 BP 773 EP 795 DI 10.1122/1.550157 PG 23 WC Mechanics SC Mechanics GA FU918 UT WOS:A1991FU91800003 ER PT J AU YUAN, CC HOWARD, RM AF YUAN, CC HOWARD, RM TI EFFECT OF FOREBODY STRAKES ON MISSILE ASYMMETRIC VORTICES SO JOURNAL OF SPACECRAFT AND ROCKETS LA English DT Article ID TURBULENT AB Wind-tunnel tests were conducted on a 1/7th-scale vertically launched surface-to-air missile model to investigate the effects of forebody strakes on the side forces and yawing moments induced by nose-generated asymmetric vortices at high angles of attack. Test angles of attack ranged from 0 to 90 deg at a Reynolds number of 1.15 x 10(5), based on the model diameter, and at a Mach number of 0.11. The four-strake forebody demonstrated dramatic results in the elimination of yawing moments at high angles of attack. The eight-strake forebody showed mixed results, with three different responses over the angle-of-attack range from 45 to 75 deg. This configuration first caused a reduction in induced yawing moment, then a violent switching, and then at very high angles had no effect. Observations concerning the onset angles of forebody- and afterbody-generated asymmetric vortices indicate that an analysis of side forces alone is insufficient to consider possible control problems for a realistically configured missile. RP YUAN, CC (reprint author), USN,POSTGRAD SCH,DEPT AERONAUT & ASTRONAUT,MONTEREY,CA 93943, USA. NR 15 TC 3 Z9 3 U1 0 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 1991 VL 28 IS 4 BP 411 EP 417 PG 7 WC Engineering, Aerospace SC Engineering GA GB522 UT WOS:A1991GB52200007 ER PT J AU KAMEL, MN ZVIRAN, M AF KAMEL, MN ZVIRAN, M TI A METHODOLOGY FOR INTEGRATING HETEROGENEOUS DATA-BASES IN A HOSPITAL ENVIRONMENT SO JOURNAL OF SYSTEMS AND SOFTWARE LA English DT Article ID SYSTEM; MANAGEMENT AB The proliferation of advanced information technology into hospitals has enhanced the development of a wide variety of applications in a hospital environment. One of the pitfalls of this trend is the fragmentation of a hospital's applications portfolio among separate, stand-alone systems in different computing environments. This usually results in a heterogeneous data base environment that limits the ability to share data among various users in a hospital. This paper describes the problem of heterogeneous data bases, discusses the need for an integrated hospital information system and provides a five-step methodology for integrating heterogeneous data bases in a hospital environment. Its goal is to provide data base integators with a systematic approach and an understanding of the issues involved for successful integration. The scope of this methodology facilitates bottom-up integration of medical, administrative, and fiscal information elements of a hospital into a unified environment. C1 USN,POSTGRAD SCH,DEPT ADM SCI,MONTEREY,CA 93943. NR 41 TC 1 Z9 1 U1 1 U2 1 PU ELSEVIER SCIENCE INC PI NEW YORK PA 655 AVENUE OF THE AMERICAS, NEW YORK, NY 10010 SN 0164-1212 J9 J SYST SOFTWARE JI J. Syst. Softw. PD JUL PY 1991 VL 15 IS 3 BP 251 EP 260 DI 10.1016/0164-1212(91)90041-4 PG 10 WC Computer Science, Software Engineering; Computer Science, Theory & Methods SC Computer Science GA GA078 UT WOS:A1991GA07800006 ER PT J AU VANBUREN, AL AF VANBUREN, AL TI PROCEDURE FOR THE INSITU CALIBRATION OF SONAR TRANSDUCERS SO JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA LA English DT Article AB Sonar transducers are usually calibrated prior to installation on a ship. They are not, however, recalibrated after installation even though their receiving (and transmitting) properties can change significantly. This report presents a procedure for the in situ calibration of sonar transducers at any desired time after installation when the ship is in open water. The procedure provides an up-to-date knowledge of the complex free-field sensitivity (or response) of each of the array transducers. This knowledge can be used to minimize, perhaps even eliminate, the adverse effects on array performance due to changes in the properties of one or more transducers. The in situ calibration procedure is based on a form of three-transducer reciprocity calibration that uses sound propagation factors to account for the influence of the ship's structure. The report describes how to obtain numerical values for the required sound propagation factors. It also describes how to use two-transducer comparison calibration to simplify the in situ calibration process, at least for highly reliable sonars. RP VANBUREN, AL (reprint author), NAVAL RES LAB,UNDERWATER SOUND REFERENCE DETACHMENT,POB 568337,ORLANDO,FL 32856, USA. NR 6 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 JUL PY 1991 VL 90 IS 1 BP 48 EP 52 DI 10.1121/1.401275 PG 5 WC Acoustics; Audiology & Speech-Language Pathology SC Acoustics; Audiology & Speech-Language Pathology GA FV280 UT WOS:A1991FV28000006 ER PT J AU GORMAN, MR AF GORMAN, MR TI PLATE WAVE ACOUSTIC-EMISSION SO JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA LA English DT Article AB Plate theory is more easily applied to the analysis of composite laminates than exact three-dimensional elasticity theory. Under conditions such that plate theory is applicable, it is suggested that plate waves are useful for understanding acoustic emission (AE) phenomena. To test this idea, pencil leads were broken on aluminum plates and composite plates, and the resulting waves were detected with a broadband ultrasonic transducer. Both the fundamental extensional and flexural modes were observed. Their characteristics are described and the implications for AE source location are discussed as well. Several transducers, commonly used for acoustic emission measurements, are compared with regard to their ability to reproduce the characteristic shapes of plate waves. Their different responses show why similar test specimens and test conditions can yield disparate results. RP GORMAN, MR (reprint author), USN,POSTGRAD SCH,MONTEREY,CA 93943, USA. NR 10 TC 119 Z9 126 U1 2 U2 19 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 1991 VL 90 IS 1 BP 358 EP 364 DI 10.1121/1.401258 PG 7 WC Acoustics; Audiology & Speech-Language Pathology SC Acoustics; Audiology & Speech-Language Pathology GA FV280 UT WOS:A1991FV28000040 ER PT J AU SARKISSIAN, A AF SARKISSIAN, A TI ACOUSTIC RADIATION FROM FINITE STRUCTURES SO JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA LA English DT Article ID RECONSTRUCTION AB Recently, the application of singular value decomposition has been discussed in identifying source modes of a radiating structure by providing a representation to the Neumann Green's function for the far field of the structure. The source modes, identified as such, will form eigenstates of radiated power. The determination of such states is of significant interest in acoustics, having applications in radiation filtering and beaming. A different algorithm is introduced for the computation of the modes which does not require the application of singular value decomposition. Since eigenstates of radiated power are also eigenstates of the surface acoustic resistance, these modes may be computed by simply diagonalizing this operator which is real and symmetric. The eigenvalues computed will be proportional to the radiated power from each mode. RP SARKISSIAN, A (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 7 TC 33 Z9 34 U1 1 U2 2 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0001-4966 J9 J ACOUST SOC AM JI J. Acoust. Soc. Am. PD JUL PY 1991 VL 90 IS 1 BP 574 EP 578 DI 10.1121/1.401231 PG 5 WC Acoustics; Audiology & Speech-Language Pathology SC Acoustics; Audiology & Speech-Language Pathology GA FV280 UT WOS:A1991FV28000064 ER PT J AU KO, SH NUTTALL, AH AF KO, SH NUTTALL, AH TI ANALYTICAL EVALUATION OF FLUSH-MOUNTED HYDROPHONE ARRAY RESPONSE TO THE CORCOS TURBULENT WALL PRESSURE SPECTRUM SO JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA LA English DT Article ID LAYER AB An analytical development for determination of the frequency spectral density that gives the response of a hydrophone array mounted on a rigid surface to turbulent boundary layer pressure fluctuations is presented. Two approaches are given for the evaluation of the integral that represents the frequency spectral density. The first approach is the contour integral (residue method), and the second is the employment of Parseval's theorem. Numerically integrated results compare favorably with the results calculated using the exact expressions presented here. RP KO, SH (reprint author), USN,UNDERWATER SYST CTR,NEW LONDON,CT 06320, USA. NR 9 TC 9 Z9 13 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 1991 VL 90 IS 1 BP 579 EP 588 DI 10.1121/1.401232 PG 10 WC Acoustics; Audiology & Speech-Language Pathology SC Acoustics; Audiology & Speech-Language Pathology GA FV280 UT WOS:A1991FV28000065 ER PT J AU SCANDRETT, CL CANRIGHT, DR AF SCANDRETT, CL CANRIGHT, DR TI ACOUSTIC INTERACTIONS IN ARRAYS OF SPHERICAL ELASTIC SHELLS SO JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA LA English DT Article ID SCATTERING; WAVES AB The acoustical performance of a submerged linear array of spherical transducers is examined by combining the T-matrix method of solving for multiple acoustic interactions among separate bodies with a model for transducers as thin spherical elastic shells. This approach solves the fully coupled problem of the response of the array to internal forcing. The results show that the assumptions giving rise to the Chebyshev criteria for optimal arrays of point sources appear to apply well even for large spheres at low frequencies. However, at frequencies near or above the lowest resonant frequency, the directional pattern may be degraded, depending on the material of the shells. RP SCANDRETT, CL (reprint author), USN,POSTGRAD SCH,DEPT MATH,CODE 53,MONTEREY,CA 93943, USA. NR 19 TC 6 Z9 6 U1 1 U2 1 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0001-4966 J9 J ACOUST SOC AM JI J. Acoust. Soc. Am. PD JUL PY 1991 VL 90 IS 1 BP 589 EP 595 DI 10.1121/1.401233 PG 7 WC Acoustics; Audiology & Speech-Language Pathology SC Acoustics; Audiology & Speech-Language Pathology GA FV280 UT WOS:A1991FV28000066 ER PT J AU JEWELL, JM AF JEWELL, JM TI THERMOOPTIC COEFFICIENTS OF SOME STANDARD REFERENCE MATERIAL GLASSES SO JOURNAL OF THE AMERICAN CERAMIC SOCIETY LA English DT Note DE GLASS; THERMOOPTICS; POLARIZATION; THERMAL EXPANSION; REFRACTIVE INDEX AB The thermooptic coefficients, i.e., the change in refractive index with temperature (dn/dT), of four National Institute of Standards and Technology standard reference material (SRM) glasses have been measured over the range of 25-degrees to 125-degrees-C. The thermooptic coefficients of all four glasses, NBS-710 (a soda-lime silicate), SRM-711 (a lead silicate), SRM-717 (a borosilicate), and SRM-739 (silica) are positive and range in value from 2 x 10(-6)/K to 9.8 x 10(-6)/K. The differences in the dn/dT of these glasses arise from differences in the coefficient of thermal expansion and the temperature coefficient of the electronic polarizability. RP JEWELL, JM (reprint author), USN,RES LAB,OPT MAT RES GRP,WASHINGTON,DC 20375, USA. NR 15 TC 30 Z9 31 U1 0 U2 12 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 1991 VL 74 IS 7 BP 1689 EP 1691 DI 10.1111/j.1151-2916.1991.tb07162.x PG 3 WC Materials Science, Ceramics SC Materials Science GA FX399 UT WOS:A1991FX39900031 ER PT J AU VANKEUREN, DK AF VANKEUREN, DK TI THE INVENTION OF PROGRESS - THE VICTORIANS AND THE PAST - BOWLER,PJ SO JOURNAL OF THE HISTORY OF THE BEHAVIORAL SCIENCES LA English DT Book Review RP VANKEUREN, DK (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 1 TC 0 Z9 0 U1 0 U2 0 PU CLINICAL PSYCHOLOGY PUBL CO PI BRANDON PA 4 CONANT SQUARE, BRANDON, VT 05733 SN 0022-5061 J9 J HIST BEHAV SCI JI J. Hist. Behav. Sci. PD JUL PY 1991 VL 27 IS 3 BP 234 EP 235 PG 2 WC History Of Social Sciences SC Social Sciences - Other Topics GA FY761 UT WOS:A1991FY76100017 ER PT J AU SELLERS, RL AF SELLERS, RL TI THE EVALUATION OF ALTERNATIVES TO OZONE-DEPLETING CHLOROFLUOROCARBONS SO JOURNAL OF THE IES LA English DT Article DE CHLOROFLUOROCARBONS; ALTERNATIVES; ELECTRONICS; AD HOC SOLVENT WORKING GROUP; SOLDERING; CLEANING AB As part of an international effort to reduce the depletion of stratospheric ozone, a test program has been developed and implemented to evaluate materials or processes as alternatives to chlorofluorocarbons (CFCs). This article discusses this development and the results of these industry-government efforts, which have expedited the transition to acceptable cleaning alternatives. RP SELLERS, RL (reprint author), USN,CTR AVION,INDIANAPOLIS,IN, 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 1991 VL 34 IS 4 BP 33 EP 38 PG 6 WC Engineering, Environmental; Environmental Sciences; Instruments & Instrumentation SC Engineering; Environmental Sciences & Ecology; Instruments & Instrumentation GA GB224 UT WOS:A1991GB22400005 ER PT J AU ISENBERG, MT AF ISENBERG, MT TI THE ZANUCKS OF HOLLYWOOD - HARRIS,MJ SO JOURNAL OF THE WEST LA English DT Book Review RP ISENBERG, MT (reprint author), USN ACAD,DEPT HIST,ANNAPOLIS,MD 21402, USA. NR 1 TC 0 Z9 0 U1 0 U2 0 PU J WEST INC PI MANHATTAN PA P O BOX 1009 1531 YUMA, MANHATTAN, KS 66502 SN 0022-5169 J9 J WEST JI J. West PD JUL PY 1991 VL 30 IS 3 BP 102 EP 102 PG 1 WC History SC History GA GA279 UT WOS:A1991GA27900024 ER PT J AU LIGRANI, PM SUBRAMANIAN, CS CRAIG, DW KAISUWAN, P AF LIGRANI, PM SUBRAMANIAN, CS CRAIG, DW KAISUWAN, P TI EFFECTS OF VORTICES WITH DIFFERENT CIRCULATIONS ON HEAT-TRANSFER AND INJECTANT DOWNSTREAM OF A SINGLE FILM-COOLING HOLE IN A TURBULENT BOUNDARY-LAYER SO JOURNAL OF TURBOMACHINERY-TRANSACTIONS OF THE ASME LA English DT Article; Proceedings Paper CT 35TH INTERNATIONAL GAS TURBINE AND AEROENGINE CONGRESS AND EXPOSITION CY JUN 11-14, 1990 CL BRUSSELS, BELGIUM ID TURBINE BLADE; FLOWS AB Results are presented that illustrate the effects of single embedded longitudinal vortices on heat transfer and injectant downstream of a single film-cooling hole in a turbulent boundary layer. Attention is focused on the changes resulting as circulation magnitudes of the vortices are varied from 0.0 to 0.15 m2/s. Mean temperature results are presented that show how injectant is distorted and redistributed by vortices, along with heat transfer measurements and mean velocity surveys. Injection hole diameter is 0.952 cm to give a ratio of vortex core diameter to hole diameter of about 1.5-1.6. The free-stream velocity is maintained at 10 m/s, and the blowing ratio is approximately 0.5. The film-cooling hole is oriented 30 deg with respect to the test surface. Stanton numbers are measured on a constant heat flux surface with a nondimensional temperature parameter of about 1.5. Two different situations are studied: one where the injection hole is beneath the vortex downwash, and one where the injection hole is beneath the vortex upwash. For both cases, vortex centers pass well within 2.9 vortex core diameters of the centerline of the injection hole. To quantify the influences of the vortices on the injectant and local heat transfer, the parameter S is used, defined as the ratio of vortex circulation to injection hole diameter times mean injection velocity. When S is greater than 1.0-1.5, injectant is swept into the vortex upwash and above the vortex core by secondary flows, and Stanton number data show evidence of injectant beneath the vortex core and downwash near the wall for x/d only up to 33.6. For larger x/d, local Stanton numbers are augmented by the vortices by as much as 23 percent relative to film-cooled boundary layers with no vortices. When S is less than 1.0-1.5, some injectant remains near the wall beneath the vortex core and downwash where it continues to provide some thermal protection. In some cases, the protection provided by film cooling is augmented because of vortex secondary flows, which cause extra injectant to accumulate near vortex upwash regions. C1 USN,POSTGRAD SCH,DEPT MECH ENGN,MONTEREY,CA 93943. OI Subramanian, Chelakara S./0000-0003-4149-2972 NR 14 TC 4 Z9 4 U1 0 U2 0 PU ASME-AMER SOC MECHANICAL ENG PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 SN 0889-504X J9 J TURBOMACH JI J. Turbomach.-Trans. ASME PD JUL PY 1991 VL 113 IS 3 BP 433 EP 441 DI 10.1115/1.2927893 PG 9 WC Engineering, Mechanical SC Engineering GA HP740 UT WOS:A1991HP74000015 ER PT J AU CRANE, JM SCHERZ, HS BILLMAN, GF KAPLAN, GW AF CRANE, JM SCHERZ, HS BILLMAN, GF KAPLAN, GW TI ISCHEMIC NECROSIS - A HYPOTHESIS TO EXPLAIN THE PATHOGENESIS OF SPONTANEOUSLY RUPTURED ENTEROCYSTOPLASTY SO JOURNAL OF UROLOGY LA English DT Article DE URINARY DIVERSION; BLADDER; RUPTURE ID AUGMENTATION ENTEROCYSTOPLASTY; BLADDER RUPTURE; REPLACEMENT; SPHINCTER; CHILDREN; COLON AB Spontaneous enterocystoplasty rupture represents a devastating and potentially fatal late complication. Previously proposed mechanisms of rupture include catheter trauma, chronic infection, avulsion of adhesions between the bowel patch and peritoneum, and chronic overdistension with elevated intravesical pressures. We have witnessed this complication 4 times in 3 patients 5 weeks to 46 months postoperatively. Tissue specimens from 3 episodes in 2 patients with detubularized sigmoid enterocystoplasties were available for histological examination. All patients had a neurogenic bladder from myelomeningocele, all had an AMS800 artificial urinary sphincter and all had a documented history of chronic distension from inadequate emptying of the augmented bladder. At exploration, all of the ruptures were found within the bowel segment near the bladder apex in an area remote from the anastomotic line. In each case tissue specimens from the rupture site showed marked vascular congestion, intramural hemorrhage, abundant hemosiderin laden macrophages, myofiber atrophy and intravascular thrombi. These features are interpreted to reflect the sequelae of vascular compromise and ischemia. We propose that enterocystoplasty rupture results from ischemia, possibly due to chronic overdistension and subsequent vascular compromise. This mechanism may account for many of the previously reported cases of enterocystoplasty rupture. C1 USN HOSP,DEPT UROL,SAN DIEGO,CA 92134. UNIV CALIF SAN DIEGO,MED CTR,SAN DIEGO,CA 92103. CHILDRENS HOSP & HLTH CTR,DEPT PEDIAT UROL,SAN DIEGO,CA. CHILDRENS HOSP & HLTH CTR,DEPT PATHOL,SAN DIEGO,CA. NR 27 TC 24 Z9 24 U1 0 U2 0 PU WILLIAMS & WILKINS PI BALTIMORE PA 351 WEST CAMDEN ST, BALTIMORE, MD 21201-2436 SN 0022-5347 J9 J UROLOGY JI J. Urol. PD JUL PY 1991 VL 146 IS 1 BP 141 EP 144 PG 4 WC Urology & Nephrology SC Urology & Nephrology GA FU473 UT WOS:A1991FU47300032 PM 2056574 ER PT J AU BURNHAM, NA COLTON, RJ POLLOCK, HM AF BURNHAM, NA COLTON, RJ POLLOCK, HM TI INTERPRETATION ISSUES IN FORCE MICROSCOPY SO JOURNAL OF VACUUM SCIENCE & TECHNOLOGY A-VACUUM SURFACES AND FILMS LA English DT Article; Proceedings Paper CT TOPICAL CONF ON THE MECHANICAL BEHAVIOR OF THIN FILMS / 37TH ANNUAL SYMP OF THE AMERICAN VACUUM SOC CY OCT 08-09, 1990 CL TORONTO, CANADA SP AMER VACUUM SOC, DIV THIN FILM, EASTMAN KODAK, DIV MAT SCI & ENGN, EASTMAN KODAK, DIV COATING TECHNOL, EASTMAN KODAK, DIV FED SYST ID SCANNING-TUNNELING-MICROSCOPY; SURFACE FORCES; ATOMIC RESOLUTION; GRAPHITE SURFACE; TUNGSTEN TIP; CONTACT; FILMS; ADHESION; WATER; AIR AB In this paper, we will discuss force microscopy (FM) and its potential for determining mechanical properties of thin films. We will introduce the basic principles of FM, and demonstrate how FM can be used to determine materials properties as well as image surface topography, both with nanonewton or sub-nanonewton force resolution and sub-nanometer position resolution. As FM is still a new field, not all of the questions concerning interpretation have been fully answered. We will elucidate four current issues that must be resolved before the full potential of FM can be realized. They are: (1) the role of water vapor and adsorbed films in imaging and force curve measurements, (2) the interpretation of force curves, (3) the influence of surface forces and loads on imaging, and (4) the nature of the imaging mechanisms. C1 USN,RES LAB,SURFACE CHEM BRANCH,WASHINGTON,DC 20375. UNIV LANCASTER,DEPT PHYS,LANCASTER LA1 4YB,ENGLAND. RI Burnham, Nancy/A-5210-2013 NR 45 TC 126 Z9 126 U1 2 U2 9 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 1991 VL 9 IS 4 BP 2548 EP 2556 DI 10.1116/1.577271 PG 9 WC Materials Science, Coatings & Films; Physics, Applied SC Materials Science; Physics GA FV995 UT WOS:A1991FV99500085 ER PT J AU ALERHAND, OL WANG, J JOANNOPOULOS, JD KAXIRAS, E AF ALERHAND, OL WANG, J JOANNOPOULOS, JD KAXIRAS, E TI GROWTH OF AS OVERLAYERS ON VICINAL SI(100) SURFACES SO JOURNAL OF VACUUM SCIENCE & TECHNOLOGY B LA English DT Article ID MOLECULAR-BEAM EPITAXY; GAAS; SI(001); SI; MICROSCOPY; INTERFACE; SILICON AB First-principles total-energy calculations are used to study the structure of As overlayers deposited on a stepped Si(100) surface. It is predicted that deposition of As at low substrate temperatures allows the As to grow directly on top of the Si surface, while growth at high temperatures results in a rearrangement of the surface as if the As replaced the original top Si layer. This result explains the sublattice orientation dilemma in GaAs-on-Si epitaxy. C1 MIT,DEPT PHYS,CAMBRIDGE,MA 02139. USN,RES LAB,COMPLEX SYST THEORY BRANCH,WASHINGTON,DC 20375. RP ALERHAND, OL (reprint author), BELLCORE,RED BANK,NJ 07701, USA. RI Schaff, William/B-5839-2009 NR 25 TC 9 Z9 9 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 1991 VL 9 IS 4 BP 2423 EP 2426 DI 10.1116/1.585714 PG 4 WC Engineering, Electrical & Electronic; Nanoscience & Nanotechnology; Physics, Applied SC Engineering; Science & Technology - Other Topics; Physics GA GB897 UT WOS:A1991GB89700089 ER PT J AU JONKER, BT PRINZ, GA IDZERDA, YU AF JONKER, BT PRINZ, GA IDZERDA, YU TI INTERFACE FORMATION AND FILM MORPHOLOGY FOR GROWTH OF FE AND CO ON ZNSE(001) SO JOURNAL OF VACUUM SCIENCE & TECHNOLOGY B LA English DT Article ID EPITAXIAL-GROWTH; SCATTERING; ELECTRON; PHOTOELECTRON; PASSIVATION; DIFFRACTION; REGROWTH; AUGER; GAAS AB We have studied the growth of Fe and Co films on ZnSe(001) epilayers and GaAs(001) bulk substrates with electron forward scattering in the form of Auger electron diffraction (AED), and with x-ray photoelectron spectroscopy (XPS) and reflection high energy electron diffraction to determine the mode of film growth and the formation of the interface. The coverage dependence of the AED forward scattering peaks is modeled and compared with the experimental data obtained for these overlayer systems. We find that the growth of Fe on ZnSe(001) at 175-degrees-C proceeds in a predominantly layer-by-layer fashion, while a more three-dimensional growth mode occurs on the oxide-desorbed GaAs(001) substrate for both Fe and Co overlayers. Deposition of Co on the ZnSe(001) epilayers results in poorly ordered multicrystalline growth. The XPS data show that the metal/ZnSe interface is less reactive than the corresponding interface with the GaAs(001) substrate. RP JONKER, BT (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 25 TC 28 Z9 28 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 1991 VL 9 IS 4 BP 2437 EP 2444 DI 10.1116/1.585717 PG 8 WC Engineering, Electrical & Electronic; Nanoscience & Nanotechnology; Physics, Applied SC Engineering; Science & Technology - Other Topics; Physics GA GB897 UT WOS:A1991GB89700092 ER PT J AU HETTEMA, CD SHIN, YS KIM, KS AF HETTEMA, CD SHIN, YS KIM, KS TI VISCOELASTIC CIRCULAR PLATE WAVE GUIDE ABSORBER SO JOURNAL OF VIBRATION AND ACOUSTICS-TRANSACTIONS OF THE ASME LA English DT Article AB A waveguide absorber removes and dissipates vibrational energy from a structure by traveling waves. The peformance of a wave guide absorber is determined by the driving point impedance. In this study a viscoelastic circular plate waveguide absorber is developed and it is shown that the driving point impedance of the viscoelastic wave guide absorber can be theoretically predicted using a Mindlin type plate theory. To validate the results of this study, viscoelastic circular plates were tested to determine their driving point impedance. RP HETTEMA, CD (reprint author), USN,POSTGRAD SCH,DEPT MECH ENGN,MONTEREY,CA 93943, USA. NR 0 TC 0 Z9 0 U1 2 U2 3 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 1991 VL 113 IS 3 BP 383 EP 386 DI 10.1115/1.2930195 PG 4 WC Acoustics; Engineering, Mechanical; Mechanics SC Acoustics; Engineering; Mechanics GA HP729 UT WOS:A1991HP72900014 ER PT J AU AU, WWL JONES, L AF AU, WWL JONES, L TI ACOUSTIC REFLECTIVITY OF NETS - IMPLICATIONS CONCERNING INCIDENTAL TAKE OF DOLPHINS SO MARINE MAMMAL SCIENCE LA English DT Article DE ACOUSTIC REFLECTIVITY OF NETS; INCIDENTAL TAKE OF DOLPHINS BY GILLNETS; DOLPHIN SONAR DETECTION OF NETS ID ECHOLOCATION SIGNALS AB Sonar target strength measurements of several types of nets and associated gear were made using simulated dolphin echolocation signals. The different types of nets included (a) standard commercial monofilament gillnet used in the salmon mothership fishery, (b) prototype hollow core monofilament net, (c) Macah tribal cord setnet, and (d) multifilament nets. Target strength measurements were made at four angles of incidence, 0-degrees (normal to net), 15-degrees, 30-degrees, and 45-degrees. The standard gillnet had the smallest target strength which was relatively independent of the angle of incidence. The target strength based on the peak-to-peak values of the echoes varied from -59 to -62 dB. Using echo energy within the integration time of Tursiops truncatus, the target strength was found to be between -54 and -59 dB. Biosonar detection ranges for different sea state conditions were estimated using the noise-limited form of the sonar equation and target detection data obtained for Tursiops truncatus in Kaneohe Bay, Oahu, Hawaii. The results suggest that an echolocating dolphin should be able to detect a gillnet at ranges long enough to avoid entanglement, even in sea state 6 conditions. Several possibilities for the seeming inability of dolphins to detect gillnets are discussed. C1 NATL MARINE MAMMAL LAB,SEATTLE,WA. RP AU, WWL (reprint author), USN,CTR OCEAN SYST,KAILUA,HI 96734, USA. NR 34 TC 22 Z9 22 U1 0 U2 7 PU SOC MARINE MAMMALOGY PI LAWRENCE PA 1041 NEW HAMPSHIRE ST, LAWRENCE, KS 66044 SN 0824-0469 J9 MAR MAMMAL SCI JI Mar. Mamm. Sci. PD JUL PY 1991 VL 7 IS 3 BP 258 EP 273 DI 10.1111/j.1748-7692.1991.tb00101.x PG 16 WC Marine & Freshwater Biology; Zoology SC Marine & Freshwater Biology; Zoology GA GB740 UT WOS:A1991GB74000003 ER PT J AU HOPE, JP AF HOPE, JP TI NAVAL FORCE LEVELS - THEORY AND PRACTICE, WITH NAVAL ENGINEERING CHALLENGES FOR THE 1990S SO MARINE TECHNOLOGY AND SNAME NEWS LA English DT Article AB This paper outlines the theory and practice of how naval force levels are created and sustained. A force level equation is shown and the factors of this equation are discussed from the contrasting perspectives of vision and reality. The naval recovery program of the 1980s is discussed in the context of naval force level theory and practice. The second part of the paper discusses naval engineering challenges for the 1990s as the United States seeks to maintain strong naval forces. Several different ship types, namely, battle force combatants, aircraft carriers, amphibious ships, and underway replenishment ships are addressed along with the capability for sealift, ocean surveillance, and protection of shipping. Potential innovations, production opportunities, and trends are highlighted. Using the prospective innovations and the theories of force levels developed in the first part of the paper, alternative force structures are shown that are of interest to naval engineers and naval warriors. RP HOPE, JP (reprint author), USN,SHIPBLDG & LOGIST,WASHINGTON,DC 20350, USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU SOC NAVAL ARCH MARINE ENG PI JERSEY CITY PA 601 PAVONIA AVENUE, JERSEY CITY, NJ 07306 SN 0025-3316 J9 MAR TECHNOL SNAME N JI Mar. Technol. Sname News PD JUL PY 1991 VL 28 IS 4 BP 224 EP 235 PG 12 WC Engineering, Ocean; Oceanography SC Engineering; Oceanography GA FX212 UT WOS:A1991FX21200005 ER PT J AU REICHEL, L AMMAR, GS GRAGG, WB AF REICHEL, L AMMAR, GS GRAGG, WB TI DISCRETE LEAST-SQUARES APPROXIMATION BY TRIGONOMETRIC POLYNOMIALS SO MATHEMATICS OF COMPUTATION LA English DT Article ID BARYCENTRIC FORMULAS; INTERPOLATION; MATRICES AB We present an efficient and reliable algorithm for discrete least squares approximation of a real-valued function given at arbitrary distinct nodes in [0, 2-pi) by trigonometric polynomials. The algorithm is based on a scheme for the solution of an inverse eigenproblem for unitary Hessenberg matrices, and requires only O(mn) arithmetic operations as compared with O(mn2) operations needed for algorithms that ignore the structure of the problem. Moreover, the proposed algorithm produces consistently accurate results that are often better than those obtained by general QR decomposition methods for the least squares problem. Our algorithm can also be used for discrete least squares approximation on the unit circle by algebraic polynomials. C1 NO ILLINOIS UNIV,DEPT MATH SCI,DE KALB,IL 60115. USN,POSTGRAD SCH,DEPT MATH,MONTEREY,CA 93943. RP REICHEL, L (reprint author), UNIV KENTUCKY,DEPT MATH,LEXINGTON,KY 40506, USA. NR 16 TC 46 Z9 46 U1 0 U2 0 PU AMER MATHEMATICAL SOC PI PROVIDENCE PA 201 CHARLES ST, PROVIDENCE, RI 02940-2213 SN 0025-5718 J9 MATH COMPUT JI Math. Comput. PD JUL PY 1991 VL 57 IS 195 BP 273 EP 289 DI 10.2307/2938673 PG 17 WC Mathematics, Applied SC Mathematics GA FZ449 UT WOS:A1991FZ44900014 ER PT J AU HAYES, DP MARRESE, M AF HAYES, DP MARRESE, M TI CHEMICAL-BIOLOGICAL WARFARE - MEDICAL LOGISTICS AND DEFENSE SO MILITARY MEDICINE LA English DT Article AB In this article, the authors discuss some of the hard realities of chemical and biological warfare defense in terms of the medical and medical logistics implications. In the opinion of the authors, there are no adequate defensive measures at present which would protect troops and sailors from the effects of either chemical or biological warfare tactics. An overview of the current world situation is presented, as well as some of the clinical and logistical responses to chem-bio war. The effectiveness of vaccinations or other medical approaches to protecting service members from chem-bio attacks is questioned in light of the technology and of the unpredictability in guessing the agent's strain or nature (e.g. viral, bacterial, or chemical). An analysis of Mission Oriented Protective Posture gear, gas masks, and other potential external protection devices reveals them to be inadequate, impractical, or expensive. In short, whether facing known war arsenals or unknown terrorist possibilities, the armed forces of the United States when meeting chemical or biological agents will be hard-pressed to protect and heal themselves, much less the nation's civilian population. RP HAYES, DP (reprint author), USN RESERVE,NC,WASHINGTON,DC, USA. NR 0 TC 1 Z9 1 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 JUL PY 1991 VL 156 IS 7 BP 321 EP 327 PG 7 WC Medicine, General & Internal SC General & Internal Medicine GA FW957 UT WOS:A1991FW95700006 PM 1922840 ER PT J AU KILBOURNE, B GOODMAN, J HILTON, S AF KILBOURNE, B GOODMAN, J HILTON, S TI PREDICTING PERSONALITY-DISORDER DIAGNOSES OF HOSPITALIZED NAVY PERSONNEL SO MILITARY MEDICINE LA English DT Article AB The study examined the relationship between type of nonpsychotic diagnosis at time of hospitalization, pre-Navy nonpsychotic condition, and paygrade for active duty, enlisted Navy personnel. The sample (N = 27,210) consisted of all hospitalized cases of active duty, enlisted Navy personnel from 1981 through 1984 with a nonpsychotic mental disorder as the primary diagnosis. Results indicated that personality disorders were more likely than other nonpsychotic diagnoses to be associated with a pre-Navy nonpsychotic condition and lower paygrades. More specifically, the strong relationship between a personality disorder diagnosis and a pre-Navy nonpsychotic condition was demonstrated only for paygrades E-1 through E-4. RP KILBOURNE, B (reprint author), USN,HLTH RES CTR,POB 85122,SAN DIEGO,CA 92138, USA. NR 0 TC 2 Z9 2 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 JUL PY 1991 VL 156 IS 7 BP 354 EP 357 PG 4 WC Medicine, General & Internal SC General & Internal Medicine GA FW957 UT WOS:A1991FW95700013 PM 1922847 ER PT J AU CHANG, EG AF CHANG, EG TI WHEN TO USE MESH IN INGUINAL-HERNIA REPAIR SO MILITARY MEDICINE LA English DT Article AB With people living longer today, averaging 73 years old, the type of patients with inguinal hernias are different than in the past. At the present time, to avoid the high incidence of recurrence due to the aged and weakened tissue component of the groin area, we reinforce the posterior wall of the inguinal canal with Mersilene (dacron) mesh. Most surgeons agree to use a prosthetic mesh in recurrent inguinal hernia repairs. Moreover, sometimes it is necessary to use mesh in patients with connective tissue disorders like Ehlers syndrome, Marfan syndrome, and acquired absence of the posterior wall fascia transversalis. Currently, polypropylene and dacron mesh are the most satisfactory, since they are readily available and become well incorporated by connective tissue. RP CHANG, EG (reprint author), USN,REG MED CTR,DEPT SURG,7500 E CARSON ST,LONG BEACH,CA 90822, USA. NR 0 TC 1 Z9 1 U1 0 U2 0 PU ASSN MILITARY SURG US PI BETHESDA PA 9320 OLD GEORGETOWN RD, BETHESDA, MD 20814 SN 0026-4075 J9 MIL MED JI Milit. Med. PD JUL PY 1991 VL 156 IS 7 BP 364 EP 366 PG 3 WC Medicine, General & Internal SC General & Internal Medicine GA FW957 UT WOS:A1991FW95700016 PM 1922850 ER PT J AU CRABB, RG AF CRABB, RG TI MEDICAL UNITS - WHO SHOULD COMMAND SO MILITARY MEDICINE LA English DT Letter RP CRABB, RG (reprint author), USN RESERVE,MSC,WASHINGTON,DC, USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU ASSN MILITARY SURG US PI BETHESDA PA 9320 OLD GEORGETOWN RD, BETHESDA, MD 20814 SN 0026-4075 J9 MIL MED JI Milit. Med. PD JUL PY 1991 VL 156 IS 7 BP A5 EP A5 PG 1 WC Medicine, General & Internal SC General & Internal Medicine GA FW957 UT WOS:A1991FW95700002 ER PT J AU WEBSTER, WP SHUMAKER, RP WARE, JR AF WEBSTER, WP SHUMAKER, RP WARE, JR TI ARTIFICIAL NEURAL NETWORKS AND THEIR APPLICATION TO WEAPONS SO NAVAL ENGINEERS JOURNAL LA English DT Discussion C1 USN,RES LAB,DIV INFORMAT TECHNOL,WASHINGTON,DC 20375. 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 1991 VL 103 IS 4 BP 96 EP 98 PG 3 WC Engineering, Marine; Engineering, Civil; Oceanography SC Engineering; Oceanography GA FY243 UT WOS:A1991FY24300014 ER PT J AU PERSHING, DE JACKSON, RH BLUEM, H FREUND, HP AF PERSHING, DE JACKSON, RH BLUEM, H FREUND, HP TI IMPROVED AMPLIFIER PERFORMANCE OF THE NRL UBITRON SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article; Proceedings Paper CT 12TH INTERNATIONAL CONF ON FREE ELECTRON LASER ( FEL 90 ) CY SEP 17-21, 1990 CL PARIS, FRANCE SP CEA, CNRS, DIRECT RECH & ETUDES TECH, FREE ELECTRON LASER CONF 88, MINIST RECH & TECHNOL FRANCE, SECRETARIAT GEN DEF NATL FRANCE, USN, OFF NAVAL RES, AEROSPATIALE ID FREE-ELECTRON-LASER; NONLINEAR-ANALYSIS AB Improved amplifier performance of the NRL Ku-band ubitron is reported following several experimental modifications. The major modification is the substitution of a higher-current (100 A), higher-quality electron gun for the original modified SLAC klystron gun (250 kV, 37 A). The experimental configuration is otherwise unchanged: a solid, uniform-density electron beam propagating through a helical wiggler/axial guide field configuration, interacting with a co-propagating circularly polarized TE11 rf wave. With these changes, small-signal gains of 23 dB have been observed in the 12.6-17.5 GHz frequency range. Good agreement between measured and calculated gain in the Raman regime has been obtained using a three-wiggler model in the 3D nonlinear FEL code ARACHNE. C1 UNIV MARYLAND,PLASMA RES LAB,COLLEGE PK,MD 20742. MISSION RES CORP,NEWINGTON,VA 22122. SCI APPLICAT INT CORP,MCLEAN,VA 22102. RP PERSHING, DE (reprint author), USN,RES LAB,DIV ELECTR SCI & TECHNOL,VACUUM ELECTR BRANCH,WASHINGTON,DC 20375, USA. NR 7 TC 11 Z9 11 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 1991 VL 304 IS 1-3 BP 127 EP 132 DI 10.1016/0168-9002(91)90834-D PG 6 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA FV595 UT WOS:A1991FV59500026 ER PT J AU DEBENHAM, PH AYRES, RL CASSATT, WA JOHNSON, BC JOHNSON, RG LINDSTROM, ER LIPOSKY, PJ MARELLA, AB MOHR, DL WHITTAKER, JK WILKIN, ND WILSON, MAD TANG, CM SPRANGLE, P PENNER, S AF DEBENHAM, PH AYRES, RL CASSATT, WA JOHNSON, BC JOHNSON, RG LINDSTROM, ER LIPOSKY, PJ MARELLA, AB MOHR, DL WHITTAKER, JK WILKIN, ND WILSON, MAD TANG, CM SPRANGLE, P PENNER, S TI STATUS-REPORT ON THE NIST-NRL 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 12TH INTERNATIONAL CONF ON FREE ELECTRON LASER ( FEL 90 ) CY SEP 17-21, 1990 CL PARIS, FRANCE SP CEA, CNRS, DIRECT RECH & ETUDES TECH, FREE ELECTRON LASER CONF 88, MINIST RECH & TECHNOL FRANCE, SECRETARIAT GEN DEF NATL FRANCE, USN, OFF NAVAL RES, AEROSPATIALE AB A free electron laser (FEL) user facility is being constructed at the National Institute of Standards and Technology (NIST) in collaboration with the Naval Research Laboratory (NRL). The FEL, which will be operated as an oscillator, will be driven by the 17 to 185 MeV electron beam of the NIST continuous-wave racetrack microtron. Anticipated performance of the FEL includes: wavelength tuneable from 200 nm to 10-mu-m, a continuous train of 3 ps pulses at either 16.5 or 66.1 MHz, and average power of 10 to 200 W. Construction of the RTM will be completed in May, 1991. The 3.64 m long undulator is assembled at the factory and is scheduled to be delivered in February, 1991. The measured rms field error is 0.6%, which is sufficiently small for good gain. Due to the broad tuning range, the use of lasers to align the cavity end mirrors is impractical. With a full-scale model of the 9 m long optical cavity, we have developed a method of aligning the mirrors to the required accuracy using white light and an autocollimator/telescope. We have performed three-dimensional simulations of performance including the effects of the electron beam (emittance, pulse length and shape, and timing jitter), undulator field errors, and cavity losses. These calculations predict adequate gain for lasing across the full wavelength range. Additional calculations are underway to predict the performance at saturation. C1 USN,RES LAB,WASHINGTON,DC 20375. RP DEBENHAM, PH (reprint author), NATL INST STAND & TECHNOL,GAITHERSBURG,MD 20899, USA. NR 10 TC 2 Z9 2 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 1991 VL 304 IS 1-3 BP 208 EP 211 PG 4 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA FV595 UT WOS:A1991FV59500043 ER PT J AU BLAU, J COLSON, WB AF BLAU, J COLSON, WB TI THE EFFECTS OF ELECTRON-BEAM QUALITY ON THE FREE-ELECTRON LASER MECHANISM SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article; Proceedings Paper CT 12TH INTERNATIONAL CONF ON FREE ELECTRON LASER ( FEL 90 ) CY SEP 17-21, 1990 CL PARIS, FRANCE SP CEA, CNRS, DIRECT RECH & ETUDES TECH, FREE ELECTRON LASER CONF 88, MINIST RECH & TECHNOL FRANCE, SECRETARIAT GEN DEF NATL FRANCE, USN, OFF NAVAL RES, AEROSPATIALE AB A characteristic function, the Fourier transform of the electron phase-velocity distribution, is introduced to better understand how electron bunching decays over time due to poor beam quality. Plots of this characteristic function are presented for various types of electron distributions. The free electron laser (FEL) integral equation shows how the time dependence of the characteristic function competes with the laser field's inherent exponential growth rate. RP BLAU, J (reprint author), USN,POSTGRAD SCH,DEPT PHYS,MONTEREY,CA 93943, USA. NR 4 TC 4 Z9 4 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 1991 VL 304 IS 1-3 BP 436 EP 438 DI 10.1016/0168-9002(91)90902-3 PG 3 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA FV595 UT WOS:A1991FV59500094 ER PT J AU KIEL, DH COLSON, WB AF KIEL, DH COLSON, WB TI MACROPARTICLE MODEL OF THE HIGH-CURRENT, STRONG-FIELD 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 12TH INTERNATIONAL CONF ON FREE ELECTRON LASER ( FEL 90 ) CY SEP 17-21, 1990 CL PARIS, FRANCE SP CEA, CNRS, DIRECT RECH & ETUDES TECH, FREE ELECTRON LASER CONF 88, MINIST RECH & TECHNOL FRANCE, SECRETARIAT GEN DEF NATL FRANCE, USN, OFF NAVAL RES, AEROSPATIALE ID HIGH-GAIN; EFFICIENCY; EXTRACTION; REGIME AB In the strong-field, high-current regime, the free electron laser driving current can be modeled by a single macroparticle representing the trapped electrons. When the trapped electrons act collectively as a macroparticle, solutions which include synchrotron oscillations can be found for the self-consistent pendulum and wave equations. RP KIEL, DH (reprint author), USN,POSTGRAD SCH,DEPT PHYS,MONTEREY,CA 93943, USA. NR 7 TC 0 Z9 0 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 1991 VL 304 IS 1-3 BP 453 EP 457 DI 10.1016/0168-9002(91)90907-8 PG 5 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA FV595 UT WOS:A1991FV59500099 ER PT J AU TANG, CM HAFIZI, B AF TANG, CM HAFIZI, B TI THEORETICAL-ANALYSIS OF RADIATION PULSES IN THE NIST NRL FEL OSCILLATOR SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article; Proceedings Paper CT 12TH INTERNATIONAL CONF ON FREE ELECTRON LASER ( FEL 90 ) CY SEP 17-21, 1990 CL PARIS, FRANCE SP CEA, CNRS, DIRECT RECH & ETUDES TECH, FREE ELECTRON LASER CONF 88, MINIST RECH & TECHNOL FRANCE, SECRETARIAT GEN DEF NATL FRANCE, USN, OFF NAVAL RES, AEROSPATIALE ID FREE-ELECTRON-LASER AB The National Institute of Standards and Technology (NIST)/Naval Research Laboratory (NRL) FEL program utilizes a cw race-track microtron as a driver for an FEL oscillator. The FEL is designed to operate at an average power of 10-200 W, with a repetition rate of 66.111 MHz and a pulse width of 3 ps, the wavelength being tunable over the range of 0.2-10-mu-m. The radiation quality depends on the resonator design, mirror detuning, mirror degradation, intracavity amplitude, electron beam stability, electron beam quality and FEL gain. We have a linearized, low gain, small-signal FEL oscillator code with a finite length electron pulse to evaluate startup and a self-consistent nonlinear pulse propagation code Julie to model the FEL oscillator at saturation. The calculations determine the mirror detuning range in the linear, small-signal regime for operation at different wavelengths. The calculations show that the electron beam jitter decreases the average gain, but will not stop the FEL from reaching saturation. Preliminary simulation results at saturation are presented. RP TANG, CM (reprint author), USN,RES LAB,DIV PLASMA PHYS,BEAM PHYS BRANCH,WASHINGTON,DC 20375, USA. NR 9 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 1991 VL 304 IS 1-3 BP 497 EP 501 DI 10.1016/0168-9002(91)90916-E PG 5 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA FV595 UT WOS:A1991FV59500108 ER PT J AU TANG, CM AF TANG, CM TI RECENT ADVANCES IN FREE-ELECTRON LASER THEORY SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article; Proceedings Paper CT 12TH INTERNATIONAL CONF ON FREE ELECTRON LASER ( FEL 90 ) CY SEP 17-21, 1990 CL PARIS, FRANCE SP CEA, CNRS, DIRECT RECH & ETUDES TECH, FREE ELECTRON LASER CONF 88, MINIST RECH & TECHNOL FRANCE, SECRETARIAT GEN DEF NATL FRANCE, USN, OFF NAVAL RES, AEROSPATIALE ID SMALL-SIGNAL MODES; NON-LINEAR THEORY; GAIN; IONIZATION; REGIME AB Free electron lasers (FELs) have advanced to the stage where the experiments may be considered to have verified the essential FEL theories. The future research in FELs with be strongly tied to applications. There exist many types of lasers and optical techniques to obtain the required laser characteristics in the optical regime. FELs can make significant impact in the IR, UV and X-ray regimes, where conventional lasers are limited. Competition with other sources also requires FELs to be compact and user oriented. The theory developments addressing some of these issues will be presented in this article. RP TANG, CM (reprint author), USN,RES LAB,DIV PLASMA PHYS,BEAM PHYS BRANCH,WASHINGTON,DC 20375, USA. NR 26 TC 2 Z9 3 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-9002 J9 NUCL INSTRUM METH A JI Nucl. Instrum. Methods Phys. Res. Sect. A-Accel. Spectrom. Dect. Assoc. Equip. PD JUL 1 PY 1991 VL 304 IS 1-3 BP 526 EP 531 DI 10.1016/0168-9002(91)90923-E PG 6 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA FV595 UT WOS:A1991FV59500115 ER PT J AU FREUND, HP AF FREUND, HP TI NONLINEAR-THEORY OF SLOW-WAVE UBITRONS 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 12TH INTERNATIONAL CONF ON FREE ELECTRON LASER ( FEL 90 ) CY SEP 17-21, 1990 CL PARIS, FRANCE SP CEA, CNRS, DIRECT RECH & ETUDES TECH, FREE ELECTRON LASER CONF 88, MINIST RECH & TECHNOL FRANCE, SECRETARIAT GEN DEF NATL FRANCE, USN, OFF NAVAL RES, AEROSPATIALE ID MAGNETIC-FIELD; RADIATION; RAMAN AB A three-dimensional nonlinear formulation of a slow-wave ubitron/free electron laser is presented. The configuration is that of an electron beam propagating through a dielectric-lined rectangular waveguide in the presence of a planar wiggler field. The wiggler field model describes parabolic pole faces for enhanced beam focussing. The electromagnetic field is described in terms of a multimode ensemble of the normal modes of the vacuum waveguide. In this case, the dielectric liner is imposed along the y-axis of the guide (which is also the principal orientation of the wiggler) and there are no orthogonal TE or TM modes. Instead, we deal with modes which are transverse electric (LSE) or magnetic (LSM) to the y-axis. Equations are derived which describe the evolution of the amplitude and phase of these modes in terms of the microscopic particle currents. These equations are solved in conjunction with the complete Lorentz force equations for the electron trajectories. The essential purpose of employing a slow-wave structure is to reach shorter wavelengths at relatively low beam energies, and numerical results will be presented to demonstrate the potentialities of this concept. C1 SCI APPLICAT INT CORP,MCLEAN,VA 22102. RP FREUND, HP (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 11 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 1991 VL 304 IS 1-3 BP 555 EP 558 DI 10.1016/0168-9002(91)90929-K PG 4 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA FV595 UT WOS:A1991FV59500121 ER PT J AU CORD, GA COLSON, WB FRISCH, J AF CORD, GA COLSON, WB FRISCH, J TI COMPARING SIMULATIONS AND EXPERIMENTAL-OBSERVATIONS OF THE TRAPPED-PARTICLE INSTABILITY IN THE STANFORD FEL SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article; Proceedings Paper CT 12TH INTERNATIONAL CONF ON FREE ELECTRON LASER ( FEL 90 ) CY SEP 17-21, 1990 CL PARIS, FRANCE SP CEA, CNRS, DIRECT RECH & ETUDES TECH, FREE ELECTRON LASER CONF 88, MINIST RECH & TECHNOL FRANCE, SECRETARIAT GEN DEF NATL FRANCE, USN, OFF NAVAL RES, AEROSPATIALE ID ELECTRON AB Simulations of the Stanford free electron laser describe the trapped-particle instability leading to sidebands and limit-cycle behavior. Comparisons are made to recent experimental results. C1 STANFORD UNIV,HIGH ENERGY PHYS LAB,STANFORD,CA 94305. RP CORD, GA (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 1991 VL 304 IS 1-3 BP 601 EP 606 DI 10.1016/0168-9002(91)90936-K PG 6 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA FV595 UT WOS:A1991FV59500128 ER PT J AU FREUND, HP GANGULY, AK AF FREUND, HP GANGULY, AK TI HIGH-EFFICIENCY OPERATION OF CHERENKOV MASERS SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article; Proceedings Paper CT 12TH INTERNATIONAL CONF ON FREE ELECTRON LASER ( FEL 90 ) CY SEP 17-21, 1990 CL PARIS, FRANCE SP CEA, CNRS, DIRECT RECH & ETUDES TECH, FREE ELECTRON LASER CONF 88, MINIST RECH & TECHNOL FRANCE, SECRETARIAT GEN DEF NATL FRANCE, USN, OFF NAVAL RES, AEROSPATIALE ID CERENKOV MASER; HIGH-POWER; OSCILLATOR; AMPLIFIER AB A nonlinear simulation of the Cherenkov maser amplifier is presented for a configuration in which an electron beam propagates through a dielectric-lined cylindrical waveguide. The parameters used correspond to an experiment at General Dynamics which measured a total efficiency of 11.5% at 8.6 GHz. The simulation is in agreement with this but indicates that the system was too short to reach saturation and that an efficiency of 30% would have been possible for a longer system, and the performance is not significantly degraded by thermal spreads up to 20%. C1 SCI APPLICAT INT CORP,MCLEAN,VA 22102. RP FREUND, HP (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 14 TC 1 Z9 1 U1 1 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 1991 VL 304 IS 1-3 BP 612 EP 616 DI 10.1016/0168-9002(91)90938-M PG 5 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA FV595 UT WOS:A1991FV59500130 ER PT J AU GILLINGHAM, DR COLSON, WB AF GILLINGHAM, DR COLSON, WB TI ELECTRON PHASE-SPACE TRAJECTORIES IN A LINEARLY POLARIZED 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 12TH INTERNATIONAL CONF ON FREE ELECTRON LASER ( FEL 90 ) CY SEP 17-21, 1990 CL PARIS, FRANCE SP CEA, CNRS, DIRECT RECH & ETUDES TECH, FREE ELECTRON LASER CONF 88, MINIST RECH & TECHNOL FRANCE, SECRETARIAT GEN DEF NATL FRANCE, USN, OFF NAVAL RES, AEROSPATIALE ID WAVE-EQUATION; GAIN AB An exact solution to the phase-space trajectories of electrons in an operating free electron laser with a linearly polarized undulator has been obtained using a numerical simulation. The complicated phase-space motion caused by the transverse undulator deflections makes a rigorous derivation for trajectories difficult, if not impossible. The Bessel function coupling coefficient, J0(xi)-J1(xi), is found to be valid over a broad range of parameters. RP GILLINGHAM, DR (reprint author), USN,POSTGRAD SCH,DEPT PHYS,MONTEREY,CA 93943, USA. NR 12 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 1991 VL 304 IS 1-3 BP 617 EP 621 DI 10.1016/0168-9002(91)90939-N PG 5 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA FV595 UT WOS:A1991FV59500131 ER PT J AU PARK, JH COLSON, WB AF PARK, JH COLSON, WB TI A SIMPLE-MODEL OF THE LLNL ELF FEL AMPLIFIER SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article; Proceedings Paper CT 12TH INTERNATIONAL CONF ON FREE ELECTRON LASER ( FEL 90 ) CY SEP 17-21, 1990 CL PARIS, FRANCE SP CEA, CNRS, DIRECT RECH & ETUDES TECH, FREE ELECTRON LASER CONF 88, MINIST RECH & TECHNOL FRANCE, SECRETARIAT GEN DEF NATL FRANCE, USN, OFF NAVAL RES, AEROSPATIALE ID FREE-ELECTRON LASER; MICROWAVE-RADIATION AB The gain spectra and power evolution from simple, single-mode simulations are compared to the LLNL ELF amplifier experiment. The agreement is found to be good. RP PARK, JH (reprint author), USN,POSTGRAD SCH,DEPT PHYS,MONTEREY,CA 93943, USA. NR 6 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 1991 VL 304 IS 1-3 BP 641 EP 643 DI 10.1016/0168-9002(91)90945-M PG 3 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA FV595 UT WOS:A1991FV59500137 ER PT J AU SOUZA, R COLSON, WB WARREN, RW GOLDSTEIN, JC AF SOUZA, R COLSON, WB WARREN, RW GOLDSTEIN, JC TI EVALUATION OF COMPACT FELS OPERATING AT 0.4 MICRON WAVELENGTH SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article; Proceedings Paper CT 12TH INTERNATIONAL CONF ON FREE ELECTRON LASER ( FEL 90 ) CY SEP 17-21, 1990 CL PARIS, FRANCE SP CEA, CNRS, DIRECT RECH & ETUDES TECH, FREE ELECTRON LASER CONF 88, MINIST RECH & TECHNOL FRANCE, SECRETARIAT GEN DEF NATL FRANCE, USN, OFF NAVAL RES, AEROSPATIALE ID HIGHER HARMONICS; ELECTRON; SIMULATIONS AB Microwiggler operation for proposed compact free electron laser devices are simulated to explore the wider use of harmonics in order to reach optical wavelengths with moderate-to-low electron beam energy. We show the gain degradation due to energy spread and strong field saturation effects to demonstrate the advantages of using harmonics in order to reduce size and complexity of FEL systems. C1 UNIV CALIF LOS ALAMOS SCI LAB,LOS ALAMOS,NM 87545. RP SOUZA, R (reprint author), USN,POSTGRAD SCH,DEPT PHYS,MONTEREY,CA 93943, USA. NR 7 TC 6 Z9 6 U1 1 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 1991 VL 304 IS 1-3 BP 687 EP 690 DI 10.1016/0168-9002(91)90956-Q PG 4 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA FV595 UT WOS:A1991FV59500148 ER PT J AU CRAUN, D COLSON, WB AF CRAUN, D COLSON, WB TI UNDULATOR FIELDS AND ELECTRON TRAJECTORIES AT THE END OF A HELICAL UNDULATOR SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article; Proceedings Paper CT 12TH INTERNATIONAL CONF ON FREE ELECTRON LASER ( FEL 90 ) CY SEP 17-21, 1990 CL PARIS, FRANCE SP CEA, CNRS, DIRECT RECH & ETUDES TECH, FREE ELECTRON LASER CONF 88, MINIST RECH & TECHNOL FRANCE, SECRETARIAT GEN DEF NATL FRANCE, USN, OFF NAVAL RES, AEROSPATIALE ID WIGGLER AB The magnetic field structure outside the entrance to a bifilar helically wound free electron laser (FEL) undulator is calculated and used to determine the incoming electron beam trajectories. The beam focusing or defocusing effects due to the stray magnetic fields are calculated and compared for different winding configurations to evaluate the optimum design. RP CRAUN, D (reprint author), USN,POSTGRAD SCH,DEPT PHYS,MONTEREY,CA 93943, USA. NR 4 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 1991 VL 304 IS 1-3 BP 714 EP 718 DI 10.1016/0168-9002(91)90963-Q PG 5 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA FV595 UT WOS:A1991FV59500155 ER PT J AU COLSON, WB ELLEAUME, P LITVINENKO, VN KIM, KJ RAMIAN, G ANTONSEN, TM GOVER, A OEPTS, D LUMPKIN, AH BENSON, S AF COLSON, WB ELLEAUME, P LITVINENKO, VN KIM, KJ RAMIAN, G ANTONSEN, TM GOVER, A OEPTS, D LUMPKIN, AH BENSON, S TI PANEL SUMMARY ON THE ULTIMATE FEL BANDWIDTH SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT LA English DT Article; Proceedings Paper CT 12TH INTERNATIONAL CONF ON FREE ELECTRON LASER ( FEL 90 ) CY SEP 17-21, 1990 CL PARIS, FRANCE SP CEA, CNRS, DIRECT RECH & ETUDES TECH, FREE ELECTRON LASER CONF 88, MINIST RECH & TECHNOL FRANCE, SECRETARIAT GEN DEF NATL FRANCE, USN, OFF NAVAL RES, AEROSPATIALE ID FREE-ELECTRON-LASER; LINEWIDTH AB Ten researchers present results of recent work in the area of the ultimate linewidth in the free electron laser (FEL). Experimental observations of fractional linewidth of 2 x 10(-7) and 3 x 10(-6) are reported, and new theoretical progress is made in the understanding of the UCSB linewidth. RP COLSON, WB (reprint author), USN,POSTGRAD SCH,DEPT PHYS,MONTEREY,CA 93943, USA. RI Antonsen, Thomas/D-8791-2017 OI Antonsen, Thomas/0000-0002-2362-2430 NR 5 TC 0 Z9 0 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-9002 J9 NUCL INSTRUM METH A JI Nucl. Instrum. Methods Phys. Res. Sect. A-Accel. Spectrom. Dect. Assoc. Equip. PD JUL 1 PY 1991 VL 304 IS 1-3 BP 822 EP 824 DI 10.1016/0168-9002(91)90983-W PG 3 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Nuclear; Physics, Particles & Fields SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA FV595 UT WOS:A1991FV59500175 ER PT J AU KANT, RA SARTWELL, BD AF KANT, RA SARTWELL, BD TI THE EFFECT OF CHLORINE ON THE SPUTTER ETCH RATE OF NICKEL SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS LA English DT Article; Proceedings Paper CT 7TH INTERNATIONAL CONF ON ION BEAM MODIFICATION OF MATERIALS ( IBMM 90 ) CY SEP 09-14, 1990 CL KNOXVILLE, TN AB The influence of a reactive gas on the rate of sputter/etching of a metal was investigated as a function of ion energy and partial pressure of the gas. Using in situ weight loss measurements, it was found that the sputtering rate of Ni was a strong function of both ion energy and chlorine pressure. Chlorine had negligible effect on the etch rate during bombardment with 25 keV Ni ions; a high pressure of chlorine reduced the etch rate for low energy Ar ions (< 500 eV), and etch rates increased for low energy ions with lower Cl pressures. The transient behavior of mass loss produced by an abrupt change in chlorine pressure was successfully modeled by a set of kinetic equations which determined the thickness of a layer of physisorbed chlorine gas that accumulated on the Ni surface during ion bombardment. Results indicate that ion bombardment can be used to control the thickness of physisorbed layers of gas which can play a significant role in controlling etch rates. RP KANT, RA (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 4 TC 0 Z9 0 U1 0 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-583X J9 NUCL INSTRUM METH B JI Nucl. Instrum. Methods Phys. Res. Sect. B-Beam Interact. Mater. Atoms PD JUL PY 1991 VL 59 BP 89 EP 92 DI 10.1016/0168-583X(91)95182-D PN 1 PG 4 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Atomic, Molecular & Chemical; Physics, Nuclear SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA FZ029 UT WOS:A1991FZ02900022 ER PT J AU HUBLER, GK CAROSELLA, CA BURKHALTER, PG FEITAG, RK COTELL, CM COLEMAN, WD AF HUBLER, GK CAROSELLA, CA BURKHALTER, PG FEITAG, RK COTELL, CM COLEMAN, WD TI FABRICATION OF LOW-Z X-RAY MIRRORS BY ION-BEAM ASSISTED DEPOSITION SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS LA English DT Article; Proceedings Paper CT 7TH INTERNATIONAL CONF ON ION BEAM MODIFICATION OF MATERIALS ( IBMM 90 ) CY SEP 09-14, 1990 CL KNOXVILLE, TN ID FUNDAMENTALS AB X-ray mirrors consisting of Si/Si3N4 layer pairs were deposited using ion beam assisted deposition. The Si was deposited by e-beam evaporation, and Si or Si3N4 were produced by closing or opening, respectively, a computer-controlled shutter over a Kaufman nitrogen ion source while Si evaporation proceeded. Mirrors were produced with 2d spacings between 50 and 100 angstrom. Excellent diffraction intensities, linewidth and peak reflectivities were obtained, demonstrating that ion beam assisted deposition is a highly reliable and straightforward technique for reproducible X-ray mirror production. RP HUBLER, GK (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 9 TC 1 Z9 1 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-583X J9 NUCL INSTRUM METH B JI Nucl. Instrum. Methods Phys. Res. Sect. B-Beam Interact. Mater. Atoms PD JUL PY 1991 VL 59 BP 268 EP 271 DI 10.1016/0168-583X(91)95220-8 PN 1 PG 4 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Atomic, Molecular & Chemical; Physics, Nuclear SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA FZ029 UT WOS:A1991FZ02900060 ER PT J AU THOMPSON, PE AF THOMPSON, PE TI MEV ION-IMPLANTATION IN GAAS TECHNOLOGY SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS LA English DT Article; Proceedings Paper CT 7TH INTERNATIONAL CONF ON ION BEAM MODIFICATION OF MATERIALS ( IBMM 90 ) CY SEP 09-14, 1990 CL KNOXVILLE, TN ID GAAS/ALGAAS SUPERLATTICES; PROFILES; SI; LAYER; SILICON; INP AB The technology base of MeV ion implantation in GaAs is reviewed. n-type implantation using Si and Si and S co-implants is emphasized. Experimental range and shape parameters obtained using secondary ion mass spectroscopy (SIMS) of Si implants having energies from 1 to 20 MeV are presented. Activation studies of these implants, as well as Si and S co-implants, annealed using both furnace anneal and rapid thermal anneal have been performed with Hall and capacitance-voltage measurements. Buried n+ profiles with a peak carrier concentration of 2 x 10(18)/cm3, located as deep as 6-mu-m beneath the surface have been formed with the co-implantation of Si and S. Application of these implants to GaAs device fabrication is discussed. Several techniques for masking the high energy implants during selective implantation are presented. The performance values of two demonstration devices, a mixer diode and a varactor diode, show that state-of-the-art devices can be fabricated using MeV implantation. RP THOMPSON, PE (reprint author), USN,RES LAB,CODE 6812,4555 OVERLOOK AVE SW,WASHINGTON,DC 20375, USA. NR 26 TC 15 Z9 15 U1 0 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-583X J9 NUCL INSTRUM METH B JI Nucl. Instrum. Methods Phys. Res. Sect. B-Beam Interact. Mater. Atoms PD JUL PY 1991 VL 59 BP 592 EP 599 DI 10.1016/0168-583X(91)95284-K PN 1 PG 8 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Atomic, Molecular & Chemical; Physics, Nuclear SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA FZ029 UT WOS:A1991FZ02900124 ER PT J AU NATISHAN, PM MCCAFFERTY, E HUBLER, GK AF NATISHAN, PM MCCAFFERTY, E HUBLER, GK TI THE PITTING CORROSION BEHAVIOR OF ALUMINUM ION-IMPLANTED WITH TANTALUM SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS LA English DT Article; Proceedings Paper CT 7TH INTERNATIONAL CONF ON ION BEAM MODIFICATION OF MATERIALS ( IBMM 90 ) CY SEP 09-14, 1990 CL KNOXVILLE, TN ID CHARGE AB The corrosion behavior of Ta-Al surface alloys produced by ion implantation at room and liquid nitrogen temperatures was examined in de-aerated, 0.1M NaCl. Surface analysis using Rutherford backscattering spectroscopy and X-ray photoelectron spectroscopy showed that the surface concentration of Ta was greater in samples that were ion implanted at liquid nitrogen temperatures. Anodic polarization curves showed that Ta ion implanted into Al at room temperature and at liquid nitrogen temperature increased the pitting potential of Al by 50 mV and 175 mV, respectively. From the standpoint of the pH of zero charge model, this behavior is explained by the presence of the implanted cations in the aluminum-oxide lattice. RP NATISHAN, PM (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 7 TC 11 Z9 11 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-583X J9 NUCL INSTRUM METH B JI Nucl. Instrum. Methods Phys. Res. Sect. B-Beam Interact. Mater. Atoms PD JUL PY 1991 VL 59 BP 841 EP 844 DI 10.1016/0168-583X(91)95716-Q PN 2 PG 4 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Atomic, Molecular & Chemical; Physics, Nuclear SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA FZ030 UT WOS:A1991FZ03000029 ER PT J AU MOORE, FG DIETRICH, HB AF MOORE, FG DIETRICH, HB TI DOSE-RATE DEPENDENT ELECTRICAL ACTIVATION OF SILICON AND SULFUR IMPLANTED INTO GAAS SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS LA English DT Article; Proceedings Paper CT 7TH INTERNATIONAL CONF ON ION BEAM MODIFICATION OF MATERIALS ( IBMM 90 ) CY SEP 09-14, 1990 CL KNOXVILLE, TN ID DAMAGE; P+ AB The electrical activation and mobility of silicon, the major n-type, ion-implanted dopant for GaAs, has been studied as a function of implantation dose rate (i.e. ion current density) at 100 keV for fluences from 5 x 10(12) to 3 x 10(14) cm-2. Systematic variations in both mobility and activation are documented for all fluences. These variations increase with the fluence. For a fluence of 10(14) cm-2, the Hall sheet carrier activation can increase by more than a factor of 2 when the ion current density is decreased from 100 x 10(-9) to 50 x 10(-9) A/cm2. Similar dose rate effects are also observed for a sulphur implant at 100 keV and a fluence of 4 x 10(14) cm-2. RP MOORE, FG (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 13 TC 7 Z9 7 U1 1 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-583X J9 NUCL INSTRUM METH B JI Nucl. Instrum. Methods Phys. Res. Sect. B-Beam Interact. Mater. Atoms PD JUL PY 1991 VL 59 BP 978 EP 980 DI 10.1016/0168-583X(91)95745-Y PN 2 PG 3 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Atomic, Molecular & Chemical; Physics, Nuclear SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA FZ030 UT WOS:A1991FZ03000058 ER PT J AU MOORE, FG KLEIN, PB DIETRICH, HB AF MOORE, FG KLEIN, PB DIETRICH, HB TI TYPE CONVERSION OF EPITAXIAL GAAS-LAYERS AFTER HEAVY-ION MEV IMPLANTATION AND ANNEALING SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS LA English DT Article; Proceedings Paper CT 7TH INTERNATIONAL CONF ON ION BEAM MODIFICATION OF MATERIALS ( IBMM 90 ) CY SEP 09-14, 1990 CL KNOXVILLE, TN ID ERBIUM-DOPED GAAS; SEMICONDUCTORS; 1.54-MU-M; DOPANTS; SI AB Heavy ion (erbium, Er-167) MeV implantation and annealing of thick epitaxial layers of n-type GaAs has been found to result in the conversion of a surface layer within the erbium profile to p-type. Similar effects in originally p-type and undoped, high resistivity layers are not observed. In addition, no active role is ascribed to the erbium in providing mobile holes. The source of the type conversion is attributed to the transfer of Si(Ga) donors to Si(As) acceptor sites as the result of the implantation and annealing. RP MOORE, FG (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 16 TC 3 Z9 3 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-583X J9 NUCL INSTRUM METH B JI Nucl. Instrum. Methods Phys. Res. Sect. B-Beam Interact. Mater. Atoms PD JUL PY 1991 VL 59 BP 1103 EP 1105 DI 10.1016/0168-583X(91)95774-8 PN 2 PG 3 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Atomic, Molecular & Chemical; Physics, Nuclear SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA FZ030 UT WOS:A1991FZ03000087 ER PT J AU ROBERTSON, HB AF ROBERTSON, HB TI INTERDICTION OF IRAQI MARITIME COMMERCE IN THE 1990-1991 PERSIAN GULF CONFLICT SO OCEAN DEVELOPMENT AND INTERNATIONAL LAW LA English DT Article AB This article examines the coercive measures adopted by coalition forces in the Persian Gulf war to interdict maritime commerce to Iraq and Kuwait following Iraq's invasion of Kuwait on August 2, 1990. It examines the practices adopted initially unilaterally by the United States and subsequently ratified by the United Nations Security Council against the background of the traditional law of blockade and contraband and in the light of a number of post-World War II situations, including the Korean conflict, the Cuban missile crisis, the Vietnam War, and the Iran-Iraq war. The article concludes that the measures adopted by the coalition fit within the evolving pattern of accommodation between states using such coercive measures and those states that are affected by them, either as subjects of coercion or bystanders. C1 USN WAR COLL,INT LAW,NEWPORT,RI 02841. RP ROBERTSON, HB (reprint author), DUKE UNIV,SCH LAW,DURHAM,NC 27706, USA. NR 20 TC 1 Z9 1 U1 0 U2 0 PU TAYLOR & FRANCIS PI BRISTOL PA 1900 FROST ROAD, SUITE 101, BRISTOL, PA 19007-1598 SN 0090-8320 J9 OCEAN DEV INT LAW JI Ocean Dev. Int. Law PD JUL-SEP PY 1991 VL 22 IS 3 BP 289 EP 299 PG 11 WC International Relations; Law SC International Relations; Government & Law GA HA521 UT WOS:A1991HA52100003 ER PT J AU MORABITO, RE AF MORABITO, RE TI MARITIME INTERDICTION - EVOLUTION OF A STRATEGY SO OCEAN DEVELOPMENT AND INTERNATIONAL LAW LA English DT Article AB The principles of blockade have evolved from maritime siege by the Dutch in 1584, to an internationally sanctioned "coercive blockade " intended to compel Iraq to leave occupied Kuwait in 1990. This strategy, viable through the centuries, remains a powerful tool in the military strategist's repertoire for meeting the challenges of low level and regional conflicts. Planning a "coercive blockade" is difficult. In a combined and joint service operation, the careful development of force composition; command, control, and communication (C3) structures; and rules of engagement, becomes extremely critical. International law considerations permeate every level of planning and execution. A careful study of contemporary operations is necessary to create Standard Operating Procedures (SOPs) that address operational and legal issues for the future use of this creative method of international coercion. RP MORABITO, RE (reprint author), USN,SAN ANTONIO,TX 78213, USA. NR 18 TC 2 Z9 2 U1 0 U2 0 PU TAYLOR & FRANCIS PI BRISTOL PA 1900 FROST ROAD, SUITE 101, BRISTOL, PA 19007-1598 SN 0090-8320 J9 OCEAN DEV INT LAW JI Ocean Dev. Int. Law PD JUL-SEP PY 1991 VL 22 IS 3 BP 301 EP 311 PG 11 WC International Relations; Law SC International Relations; Government & Law GA HA521 UT WOS:A1991HA52100004 ER PT J AU LOUAT, N SADANANDA, K AF LOUAT, N SADANANDA, K TI SOME CONSEQUENCES OF THE ELASTIC INTERACTION OF PARTICLES AND FREE SURFACES SO PHILOSOPHICAL MAGAZINE A-PHYSICS OF CONDENSED MATTER STRUCTURE DEFECTS AND MECHANICAL PROPERTIES LA English DT Article AB The stresses developed by misfitting spheres close to a planar free surface have been calculated. It is found that the mean stresses in the neighbourhood of such particles can be large enough to indicate significant increases in the rate of substitutional diffusion. Also, interactions can be so large that the formation of a crater is energetically favourable. C1 USN,RES LAB,DIV MAT SCI & TECHNOL,PHYS MET BRANCH,WASHINGTON,DC 20375. NR 9 TC 6 Z9 6 U1 0 U2 1 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 JUL PY 1991 VL 64 IS 1 BP 213 EP 221 PG 9 WC Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering; Physics, Applied; Physics, Condensed Matter SC Materials Science; Metallurgy & Metallurgical Engineering; Physics GA FX367 UT WOS:A1991FX36700014 ER PT J AU LAND, DJ AF LAND, DJ TI TIME-DEPENDENT DISTORTION IN CALCULATIONS OF K-SHELL IONIZATION FOR INCIDENT PROTONS AND HELIUM AND LITHIUM IONS SO PHYSICAL REVIEW A LA English DT Article ID HEAVY CHARGED-PARTICLES; IMPACT-PARAMETER DEPENDENCE; PERTURBED STATIONARY-STATE; UNIVERSAL CROSS-SECTIONS; COULOMB IONIZATION; ATOM COLLISIONS; ELECTRON-CAPTURE; SCA-DESCRIPTION; LIGHT-IONS; HE IONS AB Time-dependent distortion of the initial electronic state in response to the motion of the projectile is employed in calculations of total and differential cross sections for the direct-Coulomb, K-shell-ionization process within the semiclassical approximation. Selected targets are chosen from Al through Ag for incident protons and helium and lithium ions in the velocity region that corresponds to energies of 0.175 through 5.0 MeV/u for a Cu target. The distortion is taken to include both energy and wave function (via polarization) of the initial-state K-shell electron. Discussion is presented with regard to the appearance of nonorthogonal basis states. The results of calculations for the total K-shell-ionization cross section in comparison with experimental data show good agreement for protons incident on targets from Ti through Cu. Some differences are noted for Al and Ag targets, and systematically larger discrepancies with projectile atomic number are obtained for He and Li projectiles. It is found that the introduction of temporally dependent distortion causes drastic changes in the behavior of the scattering amplitude at low velocities that have not been generally appreciated. Time-dependent binding gives rise to a large suppression of the cross section (over that induced by the well-known introduction of a constant increase in binding), while time-dependent polarization leads to a large enhancement. An explanation of this behavior is suggested. Possible causes of the differences between theoretical and experimental values of the cross section are considered. Some observations apropos of the introduction of temporally dependent quantities in approximate calculations are made. RP LAND, DJ (reprint author), USN,CTR SURFACE WARFARE,SILVER SPRING,MD 20903, USA. NR 62 TC 2 Z9 2 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1050-2947 J9 PHYS REV A JI Phys. Rev. A PD JUL 1 PY 1991 VL 44 IS 1 BP 274 EP 290 DI 10.1103/PhysRevA.44.274 PG 17 WC Optics; Physics, Atomic, Molecular & Chemical SC Optics; Physics GA FV184 UT WOS:A1991FV18400038 ER PT J AU KISH, K TYAGI, S KRAFFT, C AF KISH, K TYAGI, S KRAFFT, C TI FLUX-QUANTIZATION IN SINGLE-CRYSTAL YBA2CU3O7-DELTA AS A FUNCTION OF DC AND MICROWAVE MAGNETIC-FIELDS SO PHYSICAL REVIEW B LA English DT Article ID ABSORPTION; SUPERCONDUCTORS AB Using the modulated-microwave-absorption technique, we have studied the flux quantization in single-crystal samples of YBa2Cu307-delta as a function of an externally applied dc magnetic field (dc scan) at constant amplitude of the microwave magnetic field, and as a function of the microwave-field amplitude (microwave scan) at nominally zero dc field. Periodic oscillations in the modulated microwave absorption due to flux quantization are observed in both scans. In the dc scan an increasing number of junctions are activated as the temperature is increased at a fixed microwave power level or as the power level is increased at a fixed temperature. Surprisingly, only a single junction is activated in the microwave scan in the temperature range 0.1 < t less-than-or-equal-to 0.92, where t = T/T(c) is the reduced temperature. It is shown that different junctions are activated in the two scans. From the temperature dependence of the microwave scan spectra, the superconducting penetration depth lambda-L is shown to obey the empirical two-fluid temperature dependence lambda-L(T)/lambda-L(0) = (1-t4)-1/2 in the temperature range 10-85 K, which is consistent with the s-wave-pairing mechanism. In the same temperature range the temperature dependence of the junction critical current can be described by J(c)(T)/J(c)(0) = (1-t)1.9 +/- 0.2. C1 USN,CTR AIR DEV,WARMINSTER,PA 18974. RP KISH, K (reprint author), DREXEL UNIV,DEPT PHYS,PHILADELPHIA,PA 19104, USA. RI Tyagi, Som/B-6412-2013 NR 12 TC 18 Z9 18 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 1991 VL 44 IS 1 BP 225 EP 232 DI 10.1103/PhysRevB.44.225 PG 8 WC Physics, Condensed Matter SC Physics GA FU902 UT WOS:A1991FU90200027 ER PT J AU LAMPE, M AF LAMPE, M TI A SOLVABLE SELF-SIMILAR MODEL OF THE SAUSAGE INSTABILITY IN A RESISTIVE Z-PINCH SO PHYSICS OF FLUIDS B-PLASMA PHYSICS LA English DT Article ID STABILITY; FIBER AB A solvable model is developed for the linearized sausage mode within the context of resistive magnetohydrodynamics. The model is based on the assumption that the fluid motion of the plasma is self-similar, as well as several assumptions pertinent to the limit of wavelength long compared to the pinch radius. The perturbations to the magnetic field are not assumed to be self-similar, but rather are calculated. Effects arising from time dependences of the z-independent perturbed state, e.g., current rising as t-alpha, Ohmic heating, and time variation of the pinch radius, are included in the analysis. The formalism appears to provide a good representation of "global" modes that involve coherent sausage distortion of the entire cross section of the pinch, but excludes modes that are localized radially, and higher radial eigenmodes. For this and other reasons, it is expected that the model underestimates the maximum instability growth rates, but is reasonable for global sausage modes. The net effect of resistivity and time variation of the unperturbed state is to decrease the growth rate if alpha less-than-or-similar-to 1, but never by more than a factor of about 2. The effect is to increase the growth rate if alpha greater-than-or-similar-to 1. RP LAMPE, M (reprint author), USN,RES LAB,DIV PHYS,BEAM PHYS BRANCH,WASHINGTON,DC 20375, USA. NR 22 TC 6 Z9 6 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 1991 VL 3 IS 7 BP 1521 EP 1531 DI 10.1063/1.859723 PG 11 WC Physics, Fluids & Plasmas SC Physics GA FU141 UT WOS:A1991FU14100001 ER PT J AU UHM, HS JOYCE, G AF UHM, HS JOYCE, G TI THEORY OF WAKE-FIELD EFFECTS OF A RELATIVISTIC ELECTRON-BEAM PROPAGATING IN A PLASMA SO PHYSICS OF FLUIDS B-PLASMA PHYSICS LA English DT Article ID ION-FOCUSED REGIME AB A theoretical description of the wake-field effects is presented for a relativistic electron beam propagating through a tenuous background plasma. When the electron beam enters the plasma chamber, it expels plasma electrons from its vicinity leaving ions behind. The plasma electrons move out to the charge neutralization radius and oscillate near the radius, producing wake-field effects. In terms of plasma density, beam current, rise time, and a geometrical factor of the system, the theory determines several critically important wake-field quantities, including the oscillation frequency, the wavelength, the radial profile of the induced axial electric field, and its strength. A particle simulation study of the wake-field effects is also carried out by two-dimensional particle-in-cell codes, and the simulation results are compared with the theoretical predictions. The simulation data agree remarkably well with the theoretical values. It is found from the theory and the simulation that the strength of the wake-field effects increases with beam current and plasma density. However, the wake-field strength decreases significantly as the beam current rise time increases. C1 USN,RES LAB,WASHINGTON,DC 20375. RP UHM, HS (reprint author), USN,CTR SURFACE WARFARE,SILVER SPRING,MD 20903, USA. NR 11 TC 19 Z9 19 U1 0 U2 0 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0899-8221 J9 PHYS FLUIDS B-PLASMA PD JUL PY 1991 VL 3 IS 7 BP 1587 EP 1598 DI 10.1063/1.859678 PG 12 WC Physics, Fluids & Plasmas SC Physics GA FU141 UT WOS:A1991FU14100010 ER PT J AU RHEE, MJ BOULAIS, KA AF RHEE, MJ BOULAIS, KA TI ROOT-MEAN-SQUARE EMITTANCE OF MULTIPLE BEAM SYSTEMS SO PHYSICS OF FLUIDS B-PLASMA PHYSICS LA English DT Article AB A general expression for the rms emittance of a multiple beam system is unambiguously derived. The emittances for rectangular and circular arrays of identical beamlets are analyzed and expressed in terms of quantities associated with the beamlet distribution and the array geometry. A few examples relevant to actual experiments are included. C1 UNIV MARYLAND,PLASMA RES LAB,COLLEGE PK,MD 20742. USN,CTR SURFACE WAREFARE,SILVER SPRING,MD 20903. RP RHEE, MJ (reprint author), UNIV MARYLAND,DEPT ELECT ENGN,COLLEGE PK,MD 20742, USA. NR 14 TC 2 Z9 2 U1 0 U2 0 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0899-8221 J9 PHYS FLUIDS B-PLASMA PD JUL PY 1991 VL 3 IS 7 BP 1781 EP 1786 DI 10.1063/1.859696 PG 6 WC Physics, Fluids & Plasmas SC Physics GA FU141 UT WOS:A1991FU14100030 ER PT J AU MCCARTHY, DD AF MCCARTHY, DD TI ASTRONOMICAL TIME SO PROCEEDINGS OF THE IEEE LA English DT Article ID ATMOSPHERIC ANGULAR-MOMENTUM; LENGTH AB Astronomical time serves as the basis for civil time and is required to describe the orientation of the Earth with respect to an inertial reference frame. The definitions of astronomical time scales are reviewed as well as observational methods. The causes of the variations in the Earth's rotation are explained and a brief overview of international efforts to maintain astronomical time scales is presented. RP MCCARTHY, DD (reprint author), USN OBSERV,DIV EARTH ORIENTAT PARAMETERS,WASHINGTON,DC 20392, USA. NR 18 TC 10 Z9 10 U1 0 U2 0 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0018-9219 J9 P IEEE JI Proc. IEEE PD JUL PY 1991 VL 79 IS 7 BP 915 EP 920 DI 10.1109/5.84967 PG 6 WC Engineering, Electrical & Electronic SC Engineering GA GF210 UT WOS:A1991GF21000004 ER PT J AU WINKLER, GMR AF WINKLER, GMR TI SYNCHRONIZATION AND RELATIVITY SO PROCEEDINGS OF THE IEEE LA English DT Article ID COORDINATE TIME AB The use of concepts and formulae of the Special and of the General Theory of Relativity has become a necessity in electronic systems that use high precision timing, especially space systems. The principles involved will be reviewed with emphasis on practical applications and operational standards used in timekeeping and remote synchronization. RP WINKLER, GMR (reprint author), USN OBSERV,DEPT TIME SERV,WASHINGTON,DC 20392, USA. NR 22 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 0018-9219 J9 P IEEE JI Proc. IEEE PD JUL PY 1991 VL 79 IS 7 BP 1029 EP 1039 DI 10.1109/5.84980 PG 11 WC Engineering, Electrical & Electronic SC Engineering GA GF210 UT WOS:A1991GF21000017 ER PT J AU OSTERGAARD, JC WEITZEN, JA KOSSEY, PA BAILEY, AD BENCH, PM LI, SW KATAN, JR CORIATY, AJ RASMUSSEN, JE AF OSTERGAARD, JC WEITZEN, JA KOSSEY, PA BAILEY, AD BENCH, PM LI, SW KATAN, JR CORIATY, AJ RASMUSSEN, JE TI EFFECTS OF ABSORPTION ON HIGH-LATITUDE METEOR SCATTER COMMUNICATION-SYSTEMS SO RADIO SCIENCE LA English DT Article AB Data acquired with the Geophysics Laboratory's high-latitude meteor scatter test-bed between Sondrestrom Air Base (AB) and Thule AB, Greenland, during the solar disturbances of March and August 1989 are presented. These disturbances provided a unique opportunity to observe a number of naturally occurring disturbance effects on meteor scatter links operated in the frequency range (35 to 147 MHz) covered by the test-bed. The disturbances range from signal absorption to system noise variations. The properties of ionospheric absorption in general are discussed and illustrated with computations using electron density profiles from the September 1978 solar proton event (SPE). It has been found that accurate measurements of high levels of ionospheric absorption with riometers pose special problems. These problems are identified and discussed. The data acquired during the March and August 1989 solar disturbances are then related to the zenith absorption measured at Thule, and the influence of absorption as well as system noise variations are discussed. The two events presented are very different. The August event was dominated by ionospheric absorption which affected meteor arrival rates and duty cycles primarily at the lower frequencies (35 and 45 MHz), although some effects could also be seen at the higher frequencies (65 to 147 MHz). The March event combined weak ionospheric absorption with large solar noise bursts. The effects of this event on the test-bed were dominated by increased solar noise at all frequencies. The relative influence of solar noise and ionospheric absorption during SPE events is discussed along with speculation as to the validity of frequency dependence conclusions based on testing of the JANET system. C1 USAF,GEOPHYS LAB,LID,BEDFORD,MA 01731. USN,CTR UNDERWATER SYST,NEW LONDON,CT 06320. RP OSTERGAARD, JC (reprint author), CATHOLIC UNIV LOUVAIN CLIN,CTR ATMOSPHER RES,450 AIKEN ST,B-1200 BRUSSELS,BELGIUM. NR 21 TC 2 Z9 2 U1 0 U2 0 PU AMER GEOPHYSICAL UNION PI WASHINGTON PA 2000 FLORIDA AVE NW, WASHINGTON, DC 20009 SN 0048-6604 J9 RADIO SCI JI Radio Sci. PD JUL-AUG PY 1991 VL 26 IS 4 BP 931 EP 942 DI 10.1029/91RS00584 PG 12 WC Astronomy & Astrophysics; Geochemistry & Geophysics; Meteorology & Atmospheric Sciences; Remote Sensing; Telecommunications SC Astronomy & Astrophysics; Geochemistry & Geophysics; Meteorology & Atmospheric Sciences; Remote Sensing; Telecommunications GA FZ016 UT WOS:A1991FZ01600013 ER PT J AU PAUL, AK AF PAUL, AK TI APPLICATIONS FOR HIGH-ACCURACY DIGITAL IONOSONDE DATA SO RADIO SCIENCE LA English DT Article AB Most of the information about the near-Earth's environment up to the height of the F region maximum is obtained by ionosondes. The height range in question is below the altitude of long-lasting satellites. In addition, satellite measurements cannot provide the temporal and spatial resolution for an unambiguous sampling of the dynamic phenomena of the ionosphere, unless a large number of satellites with identical equipment are placed in proper orbits. Similar remarks apply to balloon and rocket observations. The advance of digital ionosondes permits the measurements of new quantities (for example, echo phase) and of classical parameters (for example, delay time and signal strength of an echo) with much improved precision. The analysis of such data in turn provides more details and higher accuracy of properties of the ionosphere. This will be demonstrated here for electron density profile parameters, Doppler frequencies, angle of arrival measurements, and other quantities. C1 USN,CTR OCEAN SYST,DIV OCEAN & ATMOSPHER SCI,SAN DIEGO,CA 92152. NR 4 TC 3 Z9 3 U1 1 U2 1 PU AMER GEOPHYSICAL UNION PI WASHINGTON PA 2000 FLORIDA AVE NW, WASHINGTON, DC 20009 SN 0048-6604 J9 RADIO SCI JI Radio Sci. PD JUL-AUG PY 1991 VL 26 IS 4 BP 949 EP 958 DI 10.1029/91RS00773 PG 10 WC Astronomy & Astrophysics; Geochemistry & Geophysics; Meteorology & Atmospheric Sciences; Remote Sensing; Telecommunications SC Astronomy & Astrophysics; Geochemistry & Geophysics; Meteorology & Atmospheric Sciences; Remote Sensing; Telecommunications GA FZ016 UT WOS:A1991FZ01600015 ER PT J AU REILLY, MH AF REILLY, MH TI UPGRADES FOR EFFICIENT 3-DIMENSIONAL IONOSPHERIC RAY TRACING - INVESTIGATION OF HF NEAR VERTICAL INCIDENCE SKY WAVE EFFECTS SO RADIO SCIENCE LA English DT Article AB An earlier, three-dimensional ray-tracing program has been upgraded to include magnetic field effects, variable step sizes, improved propagation loss computation, and efficient homing and focusing computation algorithms. A combination of fourth-order Runge-Kutta and Adams methods, with error control and extension to variable step size, has been included. The program is applied to an investigation of high-frequency near vertical incidence sky wave (NVIS) effects. Model simulations of oblique ionograms are found to be consistent with experiment. Implications for NVIS geolocation are discussed. RP REILLY, MH (reprint author), USN,RES LAB,DIV SPACE SCI,IONOSPHER EFFECTS BRANCH,CODE 4180,WASHINGTON,DC 20375, USA. NR 10 TC 13 Z9 15 U1 0 U2 2 PU AMER GEOPHYSICAL UNION PI WASHINGTON PA 2000 FLORIDA AVE NW, WASHINGTON, DC 20009 SN 0048-6604 J9 RADIO SCI JI Radio Sci. PD JUL-AUG PY 1991 VL 26 IS 4 BP 971 EP 980 DI 10.1029/91RS00582 PG 10 WC Astronomy & Astrophysics; Geochemistry & Geophysics; Meteorology & Atmospheric Sciences; Remote Sensing; Telecommunications SC Astronomy & Astrophysics; Geochemistry & Geophysics; Meteorology & Atmospheric Sciences; Remote Sensing; Telecommunications GA FZ016 UT WOS:A1991FZ01600017 ER PT J AU REILLY, MH RHOADS, FJ GOODMAN, JM SINGH, M AF REILLY, MH RHOADS, FJ GOODMAN, JM SINGH, M TI UPDATED CLIMATOLOGICAL MODEL PREDICTIONS OF IONOSPHERIC AND HF PROPAGATION PARAMETERS SO RADIO SCIENCE LA English DT Article AB The prediction performance of ionospheric conductivity and electron density (ICED), RADAR C, and Ionospheric Communications Analysis and Predictions Program (IONCAP) climatological ionospheric models is evaluated for different regions and sunspot number inputs. With conventional sunspot numbers, based on the observed solar 10.7-cm flux, f(o)F2 prediction errors at Boulder for a particular month are no less than 18%. Use of the U.S. Air Force Global Weather Center (AFGWC) global sunspot number SSNE, extracted from ionosonde data for use with the ICED model, gives 15% errors. A dramatic improvement involves the use of single-station ionospheric data to update the driving parameters of an ionospheric model for near-real-time (NRT) predictions of f(o)F2 and other ionospheric and HF circuit parameters. For middle latitudes the improvement extends out thousands of kilometers from the update point to points of comparable corrected geomagnetic latitude. At very large distances an update scheme which exploits a strong global dependence on geomagnetic activity shows promise. For the purpose of NRT predictions of the entire electron density profile the use of two distinct effective sunspot numbers for the bottomside, coupled with one or more model parameters for the topside, is suggested for model updates from a single station. C1 SACHS FREEMAN ASSOCIATES INC,LANDOVER,MD 20785. RP REILLY, MH (reprint author), USN,RES LAB,EO HULBURT CTR SPACE RES,DIV SPACE SCI,DIV IONOSPHER EFFECTS,CODE 4180,WASHINGTON,DC 20375, USA. NR 10 TC 8 Z9 8 U1 0 U2 0 PU AMER GEOPHYSICAL UNION PI WASHINGTON PA 2000 FLORIDA AVE NW, WASHINGTON, DC 20009 SN 0048-6604 J9 RADIO SCI JI Radio Sci. PD JUL-AUG PY 1991 VL 26 IS 4 BP 1017 EP 1024 DI 10.1029/91RS00583 PG 8 WC Astronomy & Astrophysics; Geochemistry & Geophysics; Meteorology & Atmospheric Sciences; Remote Sensing; Telecommunications SC Astronomy & Astrophysics; Geochemistry & Geophysics; Meteorology & Atmospheric Sciences; Remote Sensing; Telecommunications GA FZ016 UT WOS:A1991FZ01600021 ER PT J AU ONEIL, KM RICKMAN, LS LAZARUS, AA AF ONEIL, KM RICKMAN, LS LAZARUS, AA TI PULMONARY MANIFESTATIONS OF LEPTOSPIROSIS SO REVIEWS OF INFECTIOUS DISEASES LA English DT Review ID RESPIRATORY-DISTRESS SYNDROME; IMMUNOHISTOCHEMICAL DETECTION; CARDIOVASCULAR INVOLVEMENT; PATHOLOGIC FINDINGS; HEMORRHAGE; LUNG; ICTEROHAEMORRHAGIAE; INFECTION; ANTIGEN AB Pulmonary involvement in leptospiral infection is common, usually mild, and often overlooked. When Pulmonary manifestations are prominent in a patient with leptospirosis, there is the potential for diagnostic confusion. We present the case of a patient with adult respiratory distress syndrome secondary to leptospirosis and review the pulmonary manifestations of leptospiral infection. C1 USN HOSP,DIV INFECT DIS,PORTSMOUTH,VA 23708. RP ONEIL, KM (reprint author), USN HOSP,PULM CLIN,DEPT INTERNAL MED,DIV PULM MED,WARD 5-A,PORTSMOUTH,VA 23708, USA. NR 50 TC 68 Z9 74 U1 0 U2 1 PU UNIV CHICAGO PRESS PI CHICAGO PA 5720 S WOODLAWN AVE, CHICAGO, IL 60637 SN 0162-0886 J9 REV INFECT DIS PD JUL-AUG PY 1991 VL 13 IS 4 BP 705 EP 705 PG 1 WC Immunology; Microbiology SC Immunology; Microbiology GA GA069 UT WOS:A1991GA06900026 PM 1925291 ER PT J AU HOFF, HA LECHTER, WL TOTH, LE AF HOFF, HA LECHTER, WL TOTH, LE TI COMPLEMENTARY OPTICAL AND ELECTRON MICROANALYSIS OF HIGH-TEMPERATURE SUPERCONDUCTORS SO SCANNING LA English DT Article ID CU-O SYSTEM; BULK SUPERCONDUCTIVITY; SINGLE-CRYSTALS; SR; OXIDES; 122-K; COLOR AB Scanning electron microscopy coupled to quantitative energy-dispersive x-ray spectroscopy provides an excellent tool for determining the compositions of various cuprate superconducting phases in the course of processing from insulator to superconductor. When coupled with a new room temperature optical microscopy technique for the identification of individual superconducting grains, it provides a complete picture of the processed state of the material. The techniques are complementary. Two different materials were examined with both optical and electron microscopy: (1) a Tl-Sr-Ca-Cu-O system superconducting material doped with Hg and (2) a metallic, but not superconducting La-Sr-Cu-O system material. The results and the complementary nature of optical and electron microscopy in assessing the stoichiometry and homogeneity of these materials are described. C1 SACHS FREEMAN ASSOCIATES INC,LANDOVER,MD. RP HOFF, HA (reprint author), USN,RES LAB,DIV MAT SCI & TECHNOL,CODE 6325,BLDG 42,WASHINGTON,DC 20375, USA. NR 33 TC 4 Z9 4 U1 0 U2 1 PU FAMS INC PI MAHWAH PA BOX 832, MAHWAH, NJ 07430 SN 0161-0457 J9 SCANNING JI Scanning PD JUL-AUG PY 1991 VL 13 IS 4 BP 265 EP 272 PG 8 WC Instruments & Instrumentation; Microscopy SC Instruments & Instrumentation; Microscopy GA GA388 UT WOS:A1991GA38800001 ER PT J AU DUTTA, I MITRA, S HANSEN, RC AF DUTTA, I MITRA, S HANSEN, RC TI FLEXURAL FATIGUE BEHAVIOR OF A CAST P100 GRAPHITE FIBER REINFORCED 6061 ALUMINUM COMPOSITE LAMINATE SO SCRIPTA METALLURGICA ET MATERIALIA LA English DT Article RP DUTTA, I (reprint author), USN,POSTGRAD SCH,DEPT MECH ENGN,MONTEREY,CA 93943, USA. NR 20 TC 0 Z9 0 U1 0 U2 2 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 JUL PY 1991 VL 25 IS 7 BP 1601 EP 1606 DI 10.1016/0956-716X(91)90460-I PG 6 WC Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Materials Science; Metallurgy & Metallurgical Engineering GA FU814 UT WOS:A1991FU81400021 ER PT J AU AMMAR, GS GRAGG, WB AF AMMAR, GS GRAGG, WB TI O(N2) REDUCTION ALGORITHMS FOR THE CONSTRUCTION OF A BAND MATRIX FROM SPECTRAL DATA SO SIAM JOURNAL ON MATRIX ANALYSIS AND APPLICATIONS LA English DT Article DE BAND MATRIX; INVERSE EIGENVALUE PROBLEM; GIVENS ROTATIONS AB Efficient rotation patterns are presented that provide stable O(n2) algorithms for the construction of a real symmetric band matrix having specified eigenvalues and first p components of its normalized eigenvectors. These methods can also be used in the second phase of the construction of a band matrix from the interlacing eigenvalues as described in [Linear Algebra Appl., 40 (1981), pp. 79-87]. Previously presented algorithms for these reductions that use elementary orthogonal similarity transformations require O(n3) arithmetic operations. C1 USN,POSTGRAD SCH,DEPT MATH,MONTEREY,CA 93943. RP AMMAR, GS (reprint author), NO ILLINOIS UNIV,DEPT MATH SCI,DE KALB,IL 60115, USA. NR 3 TC 9 Z9 9 U1 0 U2 0 PU SIAM PUBLICATIONS PI PHILADELPHIA PA 3600 UNIV CITY SCIENCE CENTER PH#382-9800, PHILADELPHIA, PA 19104-2688 SN 0895-4798 J9 SIAM J MATRIX ANAL A JI SIAM J. Matrix Anal. Appl. PD JUL PY 1991 VL 12 IS 3 BP 426 EP 431 DI 10.1137/0612030 PG 6 WC Mathematics, Applied SC Mathematics GA FT799 UT WOS:A1991FT79900002 ER PT J AU BOLSTER, RN SINGER, IL WEGAND, JC FAYEULLE, S GOSSETT, CR AF BOLSTER, RN SINGER, IL WEGAND, JC FAYEULLE, S GOSSETT, CR TI PREPARATION BY ION-BEAM-ASSISTED DEPOSITION, ANALYSIS AND TRIBOLOGICAL BEHAVIOR OF MOS2 FILMS SO SURFACE & COATINGS TECHNOLOGY LA English DT Article ID SLIDING LIFE; BOMBARDMENT; FRICTION; LUBRICATION; ENHANCEMENT AB Thin (100-600 nm) dual-layer MoS2 solid lubricating films were deposited on steel and ceramic substrates by ion beam sputtering with ion beam assistance. Stoichiometry was controlled by means of added sulfur from a separate target. Films prepared under various conditions were analyzed for composition and structure and were evaluated in dry and humid environments for sliding friction and endurance. Friction coefficients were low (less than 0.05) and endurances high in dry air, but these were degraded by moisture. The processing parameters and the ratio of sulfur to molybdenum had only small effects on endurance, and almost no effect on friction. The MoS2 layers were compact and partially amorphous, becoming crystalline after annealing, with basal planes usually parallel to the surface. These films appear promising as lubricants for steel or ceramic surfaces in dry or vacuum environments. C1 GEOCENTERS INC,FT WASHINGTON,MD 20744. SFA INC,LANDOVER,MD 20785. ECOLE CENT LYON,MET LAB,CNRS,UA 447,F-69131 ECULLY,FRANCE. RP BOLSTER, RN (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 20 TC 36 Z9 36 U1 0 U2 8 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 JUL PY 1991 VL 46 IS 2 BP 207 EP 216 DI 10.1016/0257-8972(91)90163-Q PG 10 WC Materials Science, Coatings & Films; Physics, Applied SC Materials Science; Physics GA FT915 UT WOS:A1991FT91500007 ER PT J AU MCKEE, CC RAGLAND, JJ MYERS, JO AF MCKEE, CC RAGLAND, JJ MYERS, JO TI AN EVALUATION OF MULTIPLE CLINICAL-VARIABLES FOR HYPOXIA DURING COLONOSCOPY SO SURGERY GYNECOLOGY & OBSTETRICS LA English DT Article ID UPPER GASTROINTESTINAL ENDOSCOPY; ELDERLY PATIENTS; COMPLICATIONS; PREMEDICATION; TENSION AB One hundred consecutive patients undergoing routine colonoscopy were evaluated for changes in arterial oxygen saturation levels. All of the patients were monitored with the Nellcor(R) N-200 pulse oximeter (Nellcor Incorporated) by finger probe and received supplemental oxygen when Sa02 levels decreased below 90 per cent. Forty patients demonstrated a decrease in Sa02 to less than 90 per cent after intravenous sedation but prior to colonoscopy, 14 patients demonstrated a decrease in Sa02 to less than 90 per cent during colonoscopy, and 46 patients maintained Sa02 levels greater than 90 per cent at all times. No statistical differences were found when these three groups were compared for age, body surface area, drug dosage, smoking history and a history of pre-existing hypertension, diabetes, arrhythmias, angina or myocardial infarction and pulmonary disease. These data indicate that all patients undergoing colonoscopy should be placed on supplemental oxygen. We further recommend continuous cardiac and pulse oximetry monitoring when available. C1 USN HOSP,DEPT SURG,SAN DIEGO,CA 92134. RP MCKEE, CC (reprint author), USN HOSP,DEPT CLIN INVEST,SAN DIEGO,CA 92134, USA. NR 10 TC 22 Z9 23 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 1991 VL 173 IS 1 BP 37 EP 40 PG 4 WC Obstetrics & Gynecology; Surgery SC Obstetrics & Gynecology; Surgery GA FU271 UT WOS:A1991FU27100010 PM 1866668 ER PT J AU SABRY, M AF SABRY, M TI A QUANTITATIVE APPROACH TO THE RELATIONSHIP BETWEEN WUCHERERIA-BANCROFTI MICROFILARIA COUNTS BY VENOUS-BLOOD FILTRATION AND FINGER-PRICK BLOOD FILMS SO TRANSACTIONS OF THE ROYAL SOCIETY OF TROPICAL MEDICINE AND HYGIENE LA English DT Article AB Counts of nocturnally periodic Wuchereria bancrofti microfilariae (mf) in 20 mm3 finger-prick blood films were compared with membrane counts after filtration of 1 ml of venous blood for their efficacy in determining the prevalence of Bancroftian filariasis. The technique used for spreading and staining the blood films was critically important to the sensitivity of this screening procedure. There was good agreement between the 2 methods. Four statistical approaches were used to measure the correlation between the 2 sampling methods: 2 linear regression methods using untransformed and transformed data, and 2 nonparametric rank correlation methods. Based on the statistical analyses, this study strongly supports the general observation that finger-prick blood samples tend to contain more mf than equivalent volumes of venous blood, at mf densities high enough to be detectable by the finger-prick technique. It also demonstrates that finger-prick samples provide good estimates of mf densities and prevalence of infection except in areas of very low mf densities, where the membrane filtration method would provide a more accurate estimate of prevalence. Regression analyses using untransformed and transformed data, and the rank correlation tests, demonstrated a strong statistically significant correlation (P < 0.001) between venous and finger-prick mf counts. RP SABRY, M (reprint author), USN,MED RES UNIT 3,RES PUBLICAT BRANCH,NEW YORK,NY 09527, USA. NR 18 TC 13 Z9 13 U1 0 U2 2 PU ROYAL SOC TROPICAL MEDICINE PI LONDON PA MANSON HOUSE 26 PORTLAND PLACE, LONDON, ENGLAND W1N 4EY SN 0035-9203 J9 T ROY SOC TROP MED H JI Trans. Roy. Soc. Trop. Med. Hyg. PD JUL-AUG PY 1991 VL 85 IS 4 BP 506 EP 510 DI 10.1016/0035-9203(91)90237-S PG 5 WC Public, Environmental & Occupational Health; Tropical Medicine SC Public, Environmental & Occupational Health; Tropical Medicine GA GD475 UT WOS:A1991GD47500024 PM 1755060 ER PT J AU YOUSSEF, FG MANSOUR, NS AF YOUSSEF, FG MANSOUR, NS TI A PURIFIED FASCIOLA-GIGANTIC WORM ANTIGEN FOR THE SERODIAGNOSIS OF HUMAN FASCIOLIASIS SO TRANSACTIONS OF THE ROYAL SOCIETY OF TROPICAL MEDICINE AND HYGIENE LA English DT Article ID HEPATICA AB Partially purified Fasciola gigantica worm antigens were evaluated in an enzyme-linked immunosorbent assay (ELISA) for the specific serological diagnosis of fascioliasis. The diagnostic potential of 10 antigen fractions derived from gel-filtration peaks (II & III) were evaluated individually or in combination against a panel of admission sera obtained from 50 patients subsequently diagnosed as having a variety of systemic parasitic diseases, and from 10 healthy volunteers with no recent history of parasitic infections. Fractions 2 and 10 were highly specific for Fasciola infection and failed to react with sera from any patient with other parasitic diseases or from controls. All other fractions exhibited reactivity with the majority of sera from the fascioliasis patients, but also with some sera from patients infected with other parasites. Based on these results, the ELISA, as outlined here, should be considered as a rapid and specific technique for the diagnosis of fascioliasis and also as an epidemiological surveillance technique in areas endemic for F. gigantica infection. C1 USN,DIV BASIC SCI,MED RES UNIT 3,CAIRO,EGYPT. NR 7 TC 6 Z9 6 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 JUL-AUG PY 1991 VL 85 IS 4 BP 535 EP 537 DI 10.1016/0035-9203(91)90247-V PG 3 WC Public, Environmental & Occupational Health; Tropical Medicine SC Public, Environmental & Occupational Health; Tropical Medicine GA GD475 UT WOS:A1991GD47500031 PM 1755065 ER PT J AU LILLO, RS MACCALLUM, ME AF LILLO, RS MACCALLUM, ME TI DECOMPRESSION COMPARISON OF N2 AND O2 IN RATS SO UNDERSEA BIOMEDICAL RESEARCH LA English DT Article DE DIVING; HYPERBARIC; DECOMPRESSION SICKNESS; OXYGEN ID ORGAN BLOOD-FLOW; HYPERBARIC-OXYGEN; CARDIAC-OUTPUT; SICKNESS; DEPTH; PRESSURE; BUBBLES; DIVES AB We have previously reported that O2 in the breathing gas mixture contributed significantly to the risk of decompression sickness (DCS) in rats after rapid (< 10 s) decompression to the surface from depth. The rate of O2 uptake was extremely fast (< 1 min estimated for equilibrium after a pressure change) compared to much slower rates for He and N2. To further define the role that O2 plays in diving, the present investigation examined decompression outcome in unanesthetized male albino rats after 60-min N2-O2 dives (1-3 atm abs O2, depth 6.26 or 7.26 atm abs). Slower decompression profiles were used to determine the elimination rates of N2 and O2 as pressure was reduced and included "stops" of up to 20 min. The probability of DCS was modeled using the maximum likelihood technique. O2 again contributed significantly to the risk of DCS, although O2 was eliminated very rapidly during decompression; the washout of N2 was considerably longer. These findings support the view that O2 can add significantly to decompression risk. However, this phenomenon may not normally be encountered during human diving operations where relatively slower decompression and lower P(O2)'s are used. RP LILLO, RS (reprint author), USN,MED RES INST,DEPT DIVING MED,BETHESDA,MD 20889, USA. NR 35 TC 13 Z9 13 U1 1 U2 1 PU UNDERSEA & HYPERBARIC MEDICAL SOC INC PI BETHESDA PA 9650 ROCKVILLE PIKE, BETHESDA, MD 20814 SN 0093-5387 J9 UNDERSEA BIOMED RES PD JUL PY 1991 VL 18 IS 4 BP 317 EP 331 PG 15 WC Oceanography SC Oceanography GA GB261 UT WOS:A1991GB26100004 PM 1887519 ER PT J AU LITTLE, BJ MANSFELD, FB AF LITTLE, BJ MANSFELD, FB TI THE CORROSION BEHAVIOR OF STAINLESS-STEELS AND COPPER-ALLOYS EXPOSED TO NATURAL SEAWATER SO WERKSTOFFE UND KORROSION-MATERIALS AND CORROSION LA English DT Article ID AQUEOUS NACL SOLUTION; CU-9.4NI-1.7FE ALLOY AB The corrosion behavior of stainless steels, titanium and copper alloys exposed to flowing Pacific Ocean water was characterized using surface analytical and electrochemical techniques. Biofilm formation on stainless steels and titanium resulted in thin films of bacteria and diatoms that did not cause significant changes of the corrosion potential (E(corr)) or surface properties. Rotating cylinder experiments indicated that both E(corr) and corrosion rates for stainless steels and titanium were independent of mass transport. Four surface layers were identified on copper-containing materials: substratum metal; an inorganic chloride corrosion layer that contained alloying elements; a biofilm; and crystalline, spherical phosphate-rich deposits. All copper surfaces were colonized by bacteria independent of alloy composition. The complexity of the impedance spectra for copper-containing materials was attributed to formation of surface layers and contributions of charge transfer and mass transport controlled reactions mediated by the layers. Both anodic and cathodic reactions for copper-based materials were affected by mass transport. C1 UNIV SO CALIF,DEPT MAT SCI,LOS ANGELES,CA 90089. RP LITTLE, BJ (reprint author), USN,NAVAL OCEANOG & ATMOSPHER RES LAB,STENNIS SPACE CTR,MS 39529, USA. NR 39 TC 15 Z9 16 U1 1 U2 5 PU VCH PUBLISHERS INC PI DEERFIELD BEACH PA 303 NW 12TH AVE, DEERFIELD BEACH, FL 33442-1788 SN 0947-5117 J9 WERKST KORROS JI Werkst. Korros.-Mater. Corros. PD JUL PY 1991 VL 42 IS 7 BP 331 EP 340 PG 10 WC Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Materials Science; Metallurgy & Metallurgical Engineering GA GB533 UT WOS:A1991GB53300001 ER PT J AU CONNOLLY, JP CRAIG, TJ SANCHEZ, RM SAGEMAN, WS OSBORN, RE AF CONNOLLY, JP CRAIG, TJ SANCHEZ, RM SAGEMAN, WS OSBORN, RE TI INTRACTABLE HICCUPS AS A PRESENTATION OF CENTRAL-NERVOUS-SYSTEM SARCOIDOSIS SO WESTERN JOURNAL OF MEDICINE LA English DT Note ID MANIFESTATIONS; NEUROSARCOIDOSIS C1 USN HOSP,DEPT INTERNAL MED,SAN DIEGO,CA 92134. USN HOSP,DEPT NEUROL,SAN DIEGO,CA 92134. USN HOSP,DEPT RADIOL,SAN DIEGO,CA 92134. RP CONNOLLY, JP (reprint author), USN HOSP,DEPT CLIN INVEST,SAN DIEGO,CA 92134, USA. NR 10 TC 6 Z9 6 U1 0 U2 0 PU CALIFORNIA PHYSICIAN MAGAZINE PI SAN FRANCISCO PA C/O DONNA TAYLOR, EDITOR, PO BOX 7690, SAN FRANCISCO, CA 94102-7690 SN 0093-0415 J9 WESTERN J MED JI West. J. Med. PD JUL PY 1991 VL 155 IS 1 BP 78 EP 79 PG 2 WC Medicine, General & Internal SC General & Internal Medicine GA FW776 UT WOS:A1991FW77600022 PM 1877244 ER PT J AU DOYLE, RJ ROSS, MM AF DOYLE, RJ ROSS, MM TI DISSOCIATIONS OF SINGLY AND MULTIPLY CHARGED FULLERENE IONS SO JOURNAL OF PHYSICAL CHEMISTRY LA English DT Letter ID CAPTURE-INDUCED DECOMPOSITION; CARBON CLUSTER IONS; C-60; BUCKMINSTERFULLERENE; REACTIVITY; BEAMS; C60 AB Tandem mass spectrometry was used to study the high-energy collision-induced dissociations of singly and multiply charged fullerene ions. It was found that kilovolt collisions of C60+ and C70+ with oxygen yield fullerene product ions, C(x)+, where x is even and greater than 32, as well as smaller carbon cluster ions, C(y)+, where y is less than 30. The distribution of the smaller carbon cluster fragment ions, which are thought to be chains and monocyclic rings, is nearly identical with that observed in laser vaporization cluster production experiments. The singly charged parent ions also yield doubly charged, charge-stripping product ions. In addition, this is the first report of multiply charged C60 ions yielding an electron-capture product ion and lower charge state fragment ions, which are both higher mass fullerene and smaller carbon cluster species. RP DOYLE, RJ (reprint author), USN,RES LAB,DIV CHEM,CODE 6113,WASHINGTON,DC 20375, USA. NR 26 TC 88 Z9 89 U1 0 U2 1 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0022-3654 J9 J PHYS CHEM-US JI J. Phys. Chem. PD JUN 27 PY 1991 VL 95 IS 13 BP 4954 EP 4956 DI 10.1021/j100166a012 PG 3 WC Chemistry, Physical SC Chemistry GA FU291 UT WOS:A1991FU29100012 ER PT J AU DOUGLASS, CH DRAKE, SM LADOUCEUR, HD AF DOUGLASS, CH DRAKE, SM LADOUCEUR, HD TI INFRARED STUDIES OF COMBUSTION OF METHANOL AND METHANOL TETRAMETHYLDISILOXANE SOLUTIONS SO JOURNAL OF PHYSICAL CHEMISTRY LA English DT Article ID CHEMICAL VAPOR-DEPOSITION; THIN SIOX FILMS; REFRACTORY COMPOUNDS; SILICON DIOXIDE; SILANE; DECOMPOSITION; CONDENSATION; NUCLEATION; ABSORPTION; MECHANISM AB Infrared emission and absorption spectra have been used to study the combustion plumes of sprays of both methanol and methanol/tetramethyldisiloxane solutions. The infrared emission features for the methanol flames arise from the CO, CO2, and H2O combustion products. The methanol/tetramethyldisiloxane flames exhibit the same features plus an additional feature at 1000-1100 cm-1. The absorption spectra have the same features and additional absorptions due to unburned fuel. Thermodynamic calculations of the properties of tetramethyldisiloxane indicate the solutions have a higher flame temperature than the methanol. Observations of the particulate matter produced in the solution flames coupled with emission spectra profiling and Mie scattering calculations lead to the identification of solid SiO as the carrier of the 1000-1100-cm-1 emission feature in the lower portion of the flame. The SiO mixes with or is converted to solid SiO2 in the upper portion of the flame, causing a shift of the emission feature to higher wavenumber. Chemical mechanisms for the production of the emitters are discussed. C1 USN,RES LAB,DIV CHEM,CODE 6110,WASHINGTON,DC 20375. NR 39 TC 1 Z9 1 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 JUN 27 PY 1991 VL 95 IS 13 BP 5198 EP 5203 DI 10.1021/j100166a052 PG 6 WC Chemistry, Physical SC Chemistry GA FU291 UT WOS:A1991FU29100052 ER PT J AU PURDY, AP GEORGE, CF CALLAHAN, JH AF PURDY, AP GEORGE, CF CALLAHAN, JH TI NEW ALKOXIDES OF COPPER AND THE ALKALINE AND ALKALINE-EARTH METALS - CRYSTAL-STRUCTURE OF NA2CU[OCH(CF3)2]4 SO INORGANIC CHEMISTRY LA English DT Article ID DERIVATIVES; REACTIVITY; PRECURSOR; ROUTE AB A variety of new alkoxides Ba(OR)2 [R = CEt3, CMeEtPr(i), CH(CMe3)2, 2-tetrahydrofurfuryl, and CH(CF3)2], M[OC(CF3)3]2 (M = Ca, Sr, and Ba), Cu(OCEt3)n (n = 1 and 2), Na2Cu(OR)4 [R = CHMe2, CH(CF3)2, and 2-tetrahydrofurfuryl], NaCu(OR)3 and NaCu(OR)2 (R = CMe3 and CEt3), Ba[Cu(OCMe3)n]2 (n = 2 and 3), and BaCu[OCH(CF3)2]4 were prepared. The compounds were characterized by those methods compatible with their properties including mass, NMR, ESR, and electronic spectroscopy, elemental analysis, sublimation and melting points, molecular weight determinations, and solubility. The alkoxide Na2Cu[OCH(CF3)2]4 crystallizes in the space group C2/c; a = 15.965 (6) angstrom, b = 12.652 (5) angstrom, c = 11.837 (5) angstrom, beta = 94.36 (3)-degrees, Z = 4, and R(F) = 6.07%. The Cu(OR)4(2-) ions have a 22.4-degrees dihedral angle between the two CuO2 planes and Cu-O distances of 1.917 (5) and 1.968 (5) angstrom. The Na+ ions are each coordinated to two O and five F atoms with Na-O distances of 2.281 (6) and 2.318 (6) angstrom and Na-F distances ranging from 2.481 (7) to 2.791 (7) angstrom, with the Na-Cu distances being 3.630 (4) and 3.821 (4) angstrom. C1 USN,RES LAB,STRUCT MATTER LAB,WASHINGTON,DC 20375. RP PURDY, AP (reprint author), USN,RES LAB,DIV CHEM,CODE 6120,WASHINGTON,DC 20375, USA. NR 49 TC 78 Z9 78 U1 0 U2 2 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 26 PY 1991 VL 30 IS 13 BP 2812 EP 2819 DI 10.1021/ic00013a020 PG 8 WC Chemistry, Inorganic & Nuclear SC Chemistry GA FU106 UT WOS:A1991FU10600020 ER PT J AU STARKWEATHER, HW AVAKIAN, P MATHESON, RR FONTANELLA, JJ WINTERSGILL, MC AF STARKWEATHER, HW AVAKIAN, P MATHESON, RR FONTANELLA, JJ WINTERSGILL, MC TI LOW-TEMPERATURE DIELECTRIC BEHAVIOR OF POLYMERS AND COPOLYMERS OF TETRAFLUOROETHYLENE SO MACROMOLECULES LA English DT Article ID RELAXATIONS AB Dielectric measurements were made on a series of polymers containing tetrafluoroethylene at temperatures from 10 to 300 K and frequencies from 10 to 10(5) Hz. In all cases, the local-mode gamma-relaxation was observed. In FEP and PFA, which contain CF3 and n-C3F7O branches, respectively, there is also a lower temperature relaxation for which the activation entropy is close to zero. In Teflon AF, an amorphous copolymer containing a large number of dioxole rings, four relaxations were observed including the glass transition near 200-degrees-C. C1 USN ACAD,DEPT PHYS,ANNAPOLIS,MD 21402. RP STARKWEATHER, HW (reprint author), DUPONT CO,EXPTL STN,CENT RES & DEV,WILMINGTON,DE 19880, USA. NR 13 TC 27 Z9 27 U1 1 U2 8 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0024-9297 J9 MACROMOLECULES JI Macromolecules PD JUN 24 PY 1991 VL 24 IS 13 BP 3853 EP 3856 DI 10.1021/ma00013a018 PG 4 WC Polymer Science SC Polymer Science GA FT906 UT WOS:A1991FT90600018 ER PT J AU CLEMENT, AE GILBREATH, GC AF CLEMENT, AE GILBREATH, GC TI PHOTOREFRACTIVE EFFECTS IN TANTALUM-DOPED POTASSIUM NIOBATE SO APPLIED OPTICS LA English DT Article ID HOLOGRAPHIC STORAGE; CRYSTALS AB Photorefractive gain is measured in poled 1% tantalum-doped potassium niobate (KNbO3). Two-wave mixing experiments are presented which exploit the r42 coefficient of KNbO3 by employing nonsymmetric geometries which rotate the grating vector away from the optic axis. The effect of this rotation on the exponential gain coefficient is shown. Experimental results are compared to an analytic expression derived for this parameter. The experiments were performed using an argon laser stabilized at lambda = 514.5 nm. The light was extraordinarily polarized, and the beams were incident on the b-face of the crystal. The absorption and the response time of the crystal were measured. Losses due to scattering and phase conjugation were also investigated. RP CLEMENT, AE (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 22 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 1991 VL 30 IS 18 BP 2458 EP 2464 PG 7 WC Optics SC Optics GA FR740 UT WOS:A1991FR74000011 PM 20700232 ER PT J AU PICKETT, WE AF PICKETT, WE TI SUPERCONDUCTIVITY - CAGEY CARBON CONUNDRUMS SO NATURE LA English DT Editorial Material RP PICKETT, WE (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 8 TC 14 Z9 14 U1 0 U2 3 PU MACMILLAN MAGAZINES LTD PI LONDON PA 4 LITTLE ESSEX STREET, LONDON, ENGLAND WC2R 3LF SN 0028-0836 J9 NATURE JI Nature PD JUN 20 PY 1991 VL 351 IS 6328 BP 602 EP 603 DI 10.1038/351602a0 PG 2 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA FT112 UT WOS:A1991FT11200027 ER PT J AU BERRY, AK GASKILL, DK STAUF, GT BOTTKA, N AF BERRY, AK GASKILL, DK STAUF, GT BOTTKA, N TI PHOTOREFLECTANCE OF SEMIINSULATING INP - RESISTIVITY EFFECTS ON THE EXCITON PHASE SO APPLIED PHYSICS LETTERS LA English DT Article ID FIELD AB It is shown that photoreflectance (PR), a contactless form of modulation spectroscopy, can be used to measure the resistivity of semi-insulating InP:Fe substrates. PR measurements of the substrates, obtained from various vendors and laboratories, were performed at 82 K and had line shapes dominated by excitonic transitions. The phase angle of the line shape was found to be a measure of the bulk resistivity of the substrate. The behavior of the line shape phase angle is explained by the exciton ionization model, where the electric field near the surface of the sample is sufficient to ionize excitons. The extent of this ionizing electric field corresponds to an optical path length which enters additively into the exciton line shape phase. Samples with higher resistivities have ionizing electric fields of larger extent, increasing the phase angle of the exciton line shape. C1 USN,RES LAB,WASHINGTON,DC 20375. RP BERRY, AK (reprint author), GEORGE MASON UNIV,FAIRFAX,VA 22030, USA. NR 9 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 JUN 17 PY 1991 VL 58 IS 24 BP 2824 EP 2826 DI 10.1063/1.104748 PG 3 WC Physics, Applied SC Physics GA FR444 UT WOS:A1991FR44400034 ER PT J AU KARLE, JM KARLE, IL AF KARLE, JM KARLE, IL TI STRUCTURE OF THE RADIATION PROTECTION AGENT S-2-(5-AMINOPENTYLAMINO) ETHYLPHOSPHOROTHIOIC ACID (WR 2823) DIHYDRATE SO ACTA CRYSTALLOGRAPHICA SECTION C-CRYSTAL STRUCTURE COMMUNICATIONS LA English DT Article ID WR-2721; CRYSTAL; WR-1065 AB C7H19N2O3PS.2H2O, M(r) = 278.3, triclinic, P1BAR, a = 6.314 (2), b = 9.616 (2), c = 12.277 (7) angstrom, alpha = 84.73 (4), beta = 75.69 (4), gamma = 73.73 (3)-degrees, V = 693.1 angstrom3, Z = 2, D(x) = 1.333 g cm-3, Cu K-alpha, lambda = 1.54178 angstrom, mu = 32.6 cm-1, F(000) = 300, room temperature, final R = 6.5% for 1904 reflections with \F-omicron\ > 3-sigma (F). WR 2823 crystallized as a double zwitterion with the two phosphate H atoms residing on the two N atoms. An intramolecular hydrogen bond between O(1) and N(3) causes the molecule to bend at the phosphate end. The S-P bond length is 2.126 (1) angstrom, and the three P-O bonds are of nearly equal length at 1.50 (1) angstrom. The WR 2823 molecules pack head to tail with hydrogen bonds between neighboring amine and phosphate groups and to water molecules. C1 USN,RES LAB,STRUCT MATTER LAB,WASHINGTON,DC 20375. RP KARLE, JM (reprint author), WALTER REED ARMY MED CTR,DEPT PHARMACOL,DIV EXPTL THERAPEUT,WASHINGTON,DC 20307, USA. NR 18 TC 2 Z9 2 U1 0 U2 0 PU MUNKSGAARD INT PUBL LTD PI COPENHAGEN PA 35 NORRE SOGADE, PO BOX 2148, DK-1016 COPENHAGEN, DENMARK SN 0108-2701 J9 ACTA CRYSTALLOGR C JI Acta Crystallogr. Sect. C-Cryst. Struct. Commun. PD JUN 15 PY 1991 VL 47 BP 1242 EP 1245 DI 10.1107/S0108270190010745 PN 6 PG 4 WC Chemistry, Multidisciplinary; Crystallography SC Chemistry; Crystallography GA FU704 UT WOS:A1991FU70400040 ER PT J AU IMES, RK HOYT, WF AF IMES, RK HOYT, WF TI MAGNETIC-RESONANCE-IMAGING SIGNS OF OPTIC-NERVE GLIOMAS IN NEUROFIBROMATOSIS-1 SO AMERICAN JOURNAL OF OPHTHALMOLOGY LA English DT Article AB We reviewed the magnetic resonance images of four children with neurofibromatosis 1 and orbital optic gliomas. The images showed double-intensity tubular thickening characteristic of perineural arachnoidal gliomatosis, elongation of the nerves, and downward kinking of the nerves in the midorbit. We believe these findings typify the orbital gliomas in patients with this disease. C1 DEPT NEUROL SURG,EDITORIAL OFF,1360 9TH AVE,STE 210,SAN FRANCISCO,CA 94122. USN HOSP,DEPT OPHTHALMOL,OAKLAND,CA. UNIV CALIF SAN FRANCISCO,SCH MED,DEPT OPHTHALMOL,SAN FRANCISCO,CA 94143. UNIV CALIF SAN FRANCISCO,SCH MED,DEPT NEUROL,SAN FRANCISCO,CA 94143. UNIV CALIF SAN FRANCISCO,SCH MED,DEPT NEUROL SURG,NEUROOPHTHALMOL UNIT,SAN FRANCISCO,CA 94143. NR 8 TC 50 Z9 51 U1 0 U2 0 PU OPHTHALMIC PUBL CO PI CHICAGO PA 77 WEST WACKER DR, STE 660, CHICAGO, IL 60601 SN 0002-9394 J9 AM J OPHTHALMOL JI Am. J. Ophthalmol. PD JUN 15 PY 1991 VL 111 IS 6 BP 729 EP 734 PG 6 WC Ophthalmology SC Ophthalmology GA FP356 UT WOS:A1991FP35600013 PM 1903904 ER PT J AU ROTOLO, JE LYNCH, JH AF ROTOLO, JE LYNCH, JH TI PENILE CANCER - CURABLE WITH EARLY DETECTION SO HOSPITAL PRACTICE LA English DT Article AB When this malignancy is recognized and treated early, cure rates are high. No one approach to the treatment of penile cancer is acceptable to all surgeons, however. Diagnosis and treatment guidelines are reviewed. RP ROTOLO, JE (reprint author), USN HOSP,SAN DIEGO,CA 92134, USA. NR 0 TC 1 Z9 1 U1 0 U2 0 PU MCGRAW HILL HEALTHCARE PUBLICATIONS PI MINNEAPOLIS PA 4530 WEST 77TH ST, MINNEAPOLIS, MN 55435-5000 SN 8750-2836 J9 HOSP PRACT JI Hosp. Pract. PD JUN 15 PY 1991 VL 26 IS 6 BP 131 EP 138 PG 8 WC Medicine, General & Internal SC General & Internal Medicine GA FR507 UT WOS:A1991FR50700015 PM 2040668 ER PT J AU UHM, HS LEE, WM AF UHM, HS LEE, WM TI HIGH-DOSE NEUTRON GENERATION FROM PLASMA ION-IMPLANTATION SO JOURNAL OF APPLIED PHYSICS LA English DT Article ID MIXED BEAMS DRIVEN; TARGET; FUSION AB Based on a theoretical estimation, a simple new scheme to generate high-dose, steady-state neutrons is presented. This new high-dose neutron source makes use of the plasma ion implantation, which consists of a cylindrical palladium rod saturated with deuterium atoms and immersed in a deuterium or tritium plasma. The plasma is contained by a grounded conducting chamber. The palladium rod is connected to a high-power modulator, which provides a series of negative-voltage pulses. During these negative pulses, deuterium or tritium ions fall into the palladium rod and collide with the deuterium atoms in it, initiating fusion reactions and emitting neutrons. This neutron device will be portable, reliable and almost free from radiation hazards except for the neutrons themselves. For reasonable system parameters allowed by present technology, we find from a theoretical calculation that the average neutron production rate = 2.3 X 10(12) s-1 for D-T reaction, which may be more than enough for most applications. The average neutron production rate for D-D reaction is two order of magnitude less than that for D-T reaction. RP UHM, HS (reprint author), USN,CTR SURFACE WARFARE,SILVER SPRING,MD 20903, USA. NR 24 TC 5 Z9 5 U1 0 U2 1 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0021-8979 J9 J APPL PHYS JI J. Appl. Phys. PD JUN 15 PY 1991 VL 69 IS 12 BP 8056 EP 8063 DI 10.1063/1.347453 PG 8 WC Physics, Applied SC Physics GA FU812 UT WOS:A1991FU81200013 ER PT J AU RAO, SI HOUSKA, CR GRABOWSKI, K ICE, G SPARKS, CJ AF RAO, SI HOUSKA, CR GRABOWSKI, K ICE, G SPARKS, CJ TI X-RAY DIFFUSE-SCATTERING FROM A NITROGEN-IMPLANTED NIOBIUM FILM SO JOURNAL OF APPLIED PHYSICS LA English DT Article ID SYNCHROTRON RADIATION; POWDER DIFFRACTION; DISLOCATION LOOPS; CRYSTALS AB A 2500-angstrom niobium single-crystal film was deposited onto a sapphire substrate and subsequently implanted with nitrogen to an average concentration of 0.5 at. %. Synchrotron radiation was used to measure the difference between the implanted and an unimplanted film to isolate the diffuse scattering from the implanted film near two Bragg reflections. This diffuse intensity arises mainly from elastic displacement fields about radiation-damage-related loops located on (211) planes. A small contribution of the scattering is calculated from the displacements about single interstitial nitrogen in octahedral sites. The Burgers vector of the loops is along the [111BAR] direction and makes an angle of 62-degrees with the loop plane giving a dominant shear component. Vacancy loops have a radius approximately 5 angstrom while interstitials are somewhat larger ranging from 10 to 15 angstrom. The number of vacancies and interstitials are nearly the same. C1 USN,RES LAB,WASHINGTON,DC 20375. OAK RIDGE NATL LAB,OAK RIDGE,TN 37831. RP RAO, SI (reprint author), VIRGINIA POLYTECH INST & STATE UNIV,DEPT MAT ENGN,BLACKSBURG,VA 24061, USA. OI Grabowski, Kenneth/0000-0003-0816-001X NR 17 TC 7 Z9 7 U1 3 U2 7 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0021-8979 J9 J APPL PHYS JI J. Appl. Phys. PD JUN 15 PY 1991 VL 69 IS 12 BP 8104 EP 8110 DI 10.1063/1.347460 PG 7 WC Physics, Applied SC Physics GA FU812 UT WOS:A1991FU81200021 ER PT J AU RAO, SI HE, BP HOUSKA, CR GRABOWSKI, K AF RAO, SI HE, BP HOUSKA, CR GRABOWSKI, K TI X-RAY-DIFFRACTION ANALYSIS OF CONCENTRATION AND RESIDUAL-STRESS GRADIENTS IN NITROGEN-IMPLANTED NIOBIUM AND MOLYBDENUM SO JOURNAL OF APPLIED PHYSICS LA English DT Article ID DIFFUSE-SCATTERING AB Large biaxial residual strains are developed after a 5-at.% implantation of N into Nb and Mo. The results indicate that the dominant source of internal strain arises from N located in interstitial sites. For Nb implanted at liquid-nitrogen temperature, the N atoms are located in octahedral sites. However, the data allow for some clustering as di- or tri-interstitials at the highest concentration (approximately 5 at. % N). Radiation damage is present as small vacancy and interstitial loops. Since vacancies and self-interstitials are present in nearly equal concentrations, the overall bulk dilatation cancels. However, because of their small size, a lesser core expansion has been included as a correction to the overall residual strain. Although one can obtain an estimate of the N distribution from TRIM, a more accurate description must include the distribution of knock-on energy. The latter has an important influence on the redistribution of N relative to that predicted by TRIM. Both host lattices (Nb and Mo) behave like "rigid containers" in directions parallel to the free surface and give a magnified elastic response normal to the free surface. C1 USN,RES LAB,WASHINGTON,DC 20375. RP RAO, SI (reprint author), VIRGINIA POLYTECH INST & STATE UNIV,DEPT MAT ENGN,BLACKSBURG,VA 24061, USA. OI Grabowski, Kenneth/0000-0003-0816-001X NR 20 TC 8 Z9 8 U1 0 U2 5 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0021-8979 J9 J APPL PHYS JI J. Appl. Phys. PD JUN 15 PY 1991 VL 69 IS 12 BP 8111 EP 8118 DI 10.1063/1.347461 PG 8 WC Physics, Applied SC Physics GA FU812 UT WOS:A1991FU81200022 ER PT J AU GRUBER, JB HILLS, ME SELTZER, MD STEVENS, SB MORRISON, CA TURNER, GA KOKTA, MR AF GRUBER, JB HILLS, ME SELTZER, MD STEVENS, SB MORRISON, CA TURNER, GA KOKTA, MR TI ENERGY-LEVELS AND CRYSTAL QUANTUM STATES OF TRIVALENT HOLMIUM IN YTTRIUM-ALUMINUM-GARNET SO JOURNAL OF APPLIED PHYSICS LA English DT Article ID ELECTRONIC RAMAN-SPECTRA; FIELD PARAMETERS; DIODE-LASER; LANTHANIDE IONS; SPECTROSCOPY; ABSORPTION; EMISSION; Y3AL5O12; ND-3+; HO3+ AB Absorption spectra of Ho3+ ions in yttrium aluminum garnet (Ho3+:YAG) are reported between 2.16 and 0.23-mu-m at various temperatures between 4 K and room temperature. Laser-excited excitation spectra and emission spectra from the 5F4 and 5S2 multiplet manifolds to the ground state manifold 5I8 were obtained at 4, 20, and 55 K. The majority of Ho3+ ions substitute for Y3+ ions in sites of D2 point-group symmetry in the lattice. Over 1000 temperature-dependent transitions (hot bands) establish 280 experimental Stark levels of the 4 f10(2S+1L(J)) multiplet manifolds. Symmetry labels GAMMA-1, GAMMA-2, GAMMA-3, or GAMMA-4, appropriate to D2 symmetry, have been assigned to Stark levels up to 43 000 cm-1. Experimental levels are compared with results obtained from a theoretical calculation. The model Hamiltonian includes Coulombic, spin-orbit, and interconfiguration interaction terms for the 4 f10 atomic configuration of Ho3+ and crystal-field terms in D2 symmetry. The Hamiltonian was diagonalized within the 50 lowest 2S+1L(J) manifolds in a LSJM(J) basis set that includes 486 calculated levels. Comparison between 151 experimental Stark levels and the corresponding levels of the lowest 199 calculated levels yields an rms deviation of 4.3 cm-1. C1 USN,CTR WEAP,RES DEPT,DIV CHEM,CHINA LAKE,CA 93555. USA,LAB COMMAND,HARRY DIAMOND LABS,ADELPHI,MD 20783. UNION CARBIDE CORP,DIV ELECTR,MAT GRP,WASHOUGAL,WA 98671. RP GRUBER, JB (reprint author), SAN JOSE STATE UNIV,DEPT PHYS,SAN JOSE,CA 95192, USA. NR 59 TC 44 Z9 45 U1 5 U2 13 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 1991 VL 69 IS 12 BP 8183 EP 8204 DI 10.1063/1.347422 PG 22 WC Physics, Applied SC Physics GA FU812 UT WOS:A1991FU81200035 ER PT J AU JOHANNESSEN, JA SHUCHMAN, RA JOHANNESSEN, OM DAVIDSON, KL LYZENGA, DR AF JOHANNESSEN, JA SHUCHMAN, RA JOHANNESSEN, OM DAVIDSON, KL LYZENGA, DR TI SYNTHETIC APERTURE RADAR IMAGING OF UPPER OCEAN CIRCULATION FEATURES AND WIND FRONTS SO JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS LA English DT Article ID IMAGERY; FIELD; SAR AB Airborne C band synthetic aperture radar (SAR) data were collected during the Norwegian Continental Shelf Experiment (NORCSEX) carried out in March 1988. Unique signature variations in the SAR backscatter due to upper ocean circulation features and wind fronts were found. It is documented that a current jet of 0.3 m s-1 with a shear of about 0.3 x 10(-3) s-1 is correlated with a narrow, bright curved line in the backscatter. In comparison a rapid wind shift of 9 m s-1 resulted in a sharp transition from dark to brighter backscatter regions. The corresponding profiles of backscatter modulation across these features are expressed by a peak of about 2 dB in contrast to a steplike increase of 5-8 dB. This suggests that SAR image expressions of upper ocean circulation features and wind fronts can be distinguished and classified. On the basis of this classification, we attempt to quantify the dominating marine geophysical variables. This method for systematic interpretation of SAR images should be further validated with the use of airborne or satellite data such as from the first European Space Agency remote sensing satellite, ERS 1. C1 USN,POSTGRAD SCH,DEPT OCEANOG,MONTEREY,CA 93943. ENVIRONM RES INST MICHIGAN,ANN ARBOR,MI 48107. RP JOHANNESSEN, JA (reprint author), NANSEN ENVIRONM & REMOTE SENSING CTR,EDVARD GRIEGSVEI 3A,N-5037 BERGEN,NORWAY. NR 29 TC 49 Z9 50 U1 2 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 JUN 15 PY 1991 VL 96 IS C6 BP 10411 EP 10422 DI 10.1029/91JC00301 PG 12 WC Oceanography SC Oceanography GA FT343 UT WOS:A1991FT34300002 ER PT J AU CHEN, JM AF CHEN, JM TI TURBULENCE-SCALE CONDENSATION PARAMETERIZATION SO JOURNAL OF THE ATMOSPHERIC SCIENCES LA English DT Note AB When a turbulence closure model is used for cloud simulations, the effect of turbulence-scale saturation must be taken into account in determining the turbulent buoyancy flux. Sommeria and Deardorff derived statistical relations through which the fractional saturation or cloudiness and the mean liquid water specific humidity can be calculated from the moments of conservative thermodynamic quantities, such as total water specific humidity and liquid water potential temperature. In deriving these relations, however, they had to rely on assumptions that were only empirically justified. Mellor showed, by a direct integration of the probability density function, that the assumptions which Sommeria and Deardorff used were not necessary for deriving those relations. But Mellor's direct integration method had to be carried out for each different relation, and can not be generalized to other derivations. In the present paper, the same relations are derived from theorems on Gaussian distributions by introducing a new quantity, q(x), which converts the original two-parameter turbulence-scale saturation parameterization problem to a single-parameter problem. A systematic solution method is established based on these theorems. Quantities involving liquid water specific humidity can be obtained through this parameterization from those conservative variables for which predictive equations are available and for which Gaussian distributions are presumed. RP CHEN, JM (reprint author), USN,POSTGRAD SCH,DEPT METEOROL,MONTEREY,CA 93943, USA. NR 4 TC 15 Z9 16 U1 0 U2 1 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 15 PY 1991 VL 48 IS 12 BP 1510 EP 1512 DI 10.1175/1520-0469(1991)048<1510:TSCP>2.0.CO;2 PG 3 WC Meteorology & Atmospheric Sciences SC Meteorology & Atmospheric Sciences GA FW936 UT WOS:A1991FW93600007 ER PT J AU BEECHAM, HJ OLDFIELD, EC LEWIS, DE BUKER, JL AF BEECHAM, HJ OLDFIELD, EC LEWIS, DE BUKER, JL TI MYCOBACTERIUM-MARINUM INFECTION FROM SHUCKING OYSTERS SO LANCET LA English DT Letter C1 USN HOSP,DEPT CLIN INVEST,SAN DIEGO,CA 92134. USN HOSP,DEPT DERMATOL,MILLINGTON,TN. RP BEECHAM, HJ (reprint author), USN HOSP,DEPT INTERNAL MED,DIV INFECT DIS,SAN DIEGO,CA 92134, USA. NR 1 TC 5 Z9 5 U1 0 U2 0 PU LANCET LTD PI LONDON PA 42 BEDFORD SQUARE, LONDON, ENGLAND WC1B 3SL SN 0140-6736 J9 LANCET JI Lancet PD JUN 15 PY 1991 VL 337 IS 8755 BP 1487 EP 1487 DI 10.1016/0140-6736(91)93183-A PG 1 WC Medicine, General & Internal SC General & Internal Medicine GA FR060 UT WOS:A1991FR06000060 PM 1675357 ER PT J AU APRUZESE, JP KEPPLE, PC AF APRUZESE, JP KEPPLE, PC TI OVERLAPPED STARK PROFILES OF COINCIDENT X-RAY-LINES AS POSSIBLE DIAGNOSTICS OF CORE-SHELL MIXING IN SPHERICAL PLASMA IMPLOSIONS SO PHYSICAL REVIEW A LA English DT Article ID LASER-DRIVEN IMPLOSIONS; RAYLEIGH-TAYLOR GROWTH; HIGH-DENSITY; IMPLODED TARGETS; COMPRESSION; ARGON; SPECTROSCOPY; STABILITY; FUSION AB One of the most serious obstacles to the attainment of high-gain inertial confinement fusion is the loss of implosion symmetry and mixing of core and shell material, principally as a result of Rayleigh-Taylor instabilities. As a diagnostic of such instabilities, we have investigated the consequences of such mixing on the emergent composite Stark profile of the heliumlike potassium 1s2-1s2p 1P1 and hydrogenic chlorine 1s-3p lines that are coincident at 3.53 angstrom (3.51 keV). For the case of a chlorine-filled core compressed by a potassium-bearing shell, detailed radiative transfer calculations with self-consistently calculated Stark profiles reveal changes in the overlapped emission profile of these lines when the potassium is assumed mixed into the core. When the potassium remains localized in a distinct shell, its major effect on the chlorine profile is to produce an absorption feature. When the two elements mix to various degrees, the depth of this feature is reduced. This is explained by pumping of the K XVIII 1s2p 1P1 state by the Cl L-beta-line, and obscuration of the potassium emission by the chlorine opacity. Experimental detection of this effect would require spectral resolution of about 2 eV and the ability to discriminate intensity differences of 15% in nearby spectral regions. RP APRUZESE, JP (reprint author), USN,RES LAB,DIV PLASMA PHYS,RADIAT HYDRODYNAM BRANCH,WASHINGTON,DC 20375, USA. NR 27 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 1050-2947 J9 PHYS REV A JI Phys. Rev. A PD JUN 15 PY 1991 VL 43 IS 12 BP 6964 EP 6969 DI 10.1103/PhysRevA.43.6964 PG 6 WC Optics; Physics, Atomic, Molecular & Chemical SC Optics; Physics GA FU846 UT WOS:A1991FU84600053 ER PT J AU MINTMIRE, JW DUNLAP, BI BRENNER, DW MOWREY, RC WHITE, CT AF MINTMIRE, JW DUNLAP, BI BRENNER, DW MOWREY, RC WHITE, CT TI LOCAL-DENSITY FUNCTIONAL PHOTOELECTRON-SPECTRA OF FULLERENES SO PHYSICAL REVIEW B LA English DT Note ID CARBON; C-60; BUCKMINSTERFULLERENE; MOLECULES; FORM; C60 AB We have calculated the electronic structure of several hollow-carbon-cage molecules - the "fullerenes" - via an all-electron Gaussian-orbital-based local-density-functional approach. Starting with the one-electron wave functions and eigenvalues obtained from these calculations, we have further calculated spherically averaged cross sections for photoelectron emission, using a first-order time-dependent perturbation-theory approach. We present results for C60 (the sixty-atom molecule with truncated-pentagonal-icosahedron structure), C70, and C84, and compare these theoretical predictions with recent experimental results for C60. RP MINTMIRE, JW (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. RI Brenner, Donald/D-1741-2009; OI Mintmire, John/0000-0002-6551-0349 NR 30 TC 55 Z9 55 U1 0 U2 1 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1098-0121 J9 PHYS REV B JI Phys. Rev. B PD JUN 15 PY 1991 VL 43 IS 17 BP 14281 EP 14284 DI 10.1103/PhysRevB.43.14281 PG 4 WC Physics, Condensed Matter SC Physics GA FQ974 UT WOS:A1991FQ97400062 ER PT J AU GLASER, ER KENNEDY, TA MOLNAR, B SILLMON, RS SPENCER, MG MIZUTA, M KUECH, TF AF GLASER, ER KENNEDY, TA MOLNAR, B SILLMON, RS SPENCER, MG MIZUTA, M KUECH, TF TI OPTICALLY DETECTED MAGNETIC-RESONANCE OF GROUP-IV AND GROUP-VI IMPURITIES IN ALAS AND ALXGA1-XAS WITH X-GREATER-THAN-OR-EQUAL-TO-0.35 SO PHYSICAL REVIEW B LA English DT Article ID ELECTRON-PARAMAGNETIC-RESONANCE; CONDUCTION-BAND VALLEYS; DX-CENTER; GAAS; GAP; DONORS; SILICON; STATES; HETEROSTRUCTURES; DEFECTS AB Optically detected magnetic-resonance (ODMR) experiments have been performed on n-doped epitaxial layers of AlAs and Al(x)Ga(1-x)As with x greater-than-or-equal-to 0.35 grown on (001) GaAs substrates. The Al(x)Ga(1-x)As layers were doped during growth or via implantation with Si and Sn impurities from group IV and S, Se, and Te impurities from group VI. The studies were carried out with the as- grown layers on the parent GaAs substrates, removed from the substrates, and attached to substrates with larger lattice constants at low temperatures. Symmetry information was obtained from angular-rotation studies with the magnetic field rotated in the (11BAR0) and (001) crystal planes. Also, uniaxial stress along the [11BAR0] and [100] directions has been combined with ODMR to further probe the symmetry of the donor states. The magnetic resonance was detected mainly on deep (1.0-1.8-mu-m) radiative-recombination processes. The donor state in Si-doped AlAs can be described by the usual hydrogenic effective-mass theory for substitutional donors on the group-III site associated with the X-point conduction-band minima. The g-value anisotropy and splitting observed from the rotation studies in the (11BAR0) and (001) planes, respectively, can be understood using an independent-valley model. The Si-donor g values in AlAs are the following: g perpendicular-to = 1.976 +/- 0.001 and g parallel-to = 1.917 +/- 0.001 with respect to the long axes of the X-valley ellipsoid. The results obtained for the Al(x)Ga(1-x)As layers doped with S, Se, and Te, particularly for samples with x greater-than-or-equal-to 0. 6, can be described by the hydrogenic effective-mass theory modified by a finite valley-orbit (i.e., central cell) interaction that mixes the states derived from the X(x), X(y), and X(z) valleys to form an A1 ground state, as predicted by Morgan. Analyses of these results within the virtual-crystal approximation yield valley-orbit splitting energies (i.e., chemical shifts) of approximately 16-20 meV for these group-VI donors in Al0.6Ga0.4As. The nature of the donor states in the Si-doped Al(x)Ga(1-x)As heterostructures with x < 1 is more complicated. The monotonic decrease in both the g-value anisotropy and splitting with decreasing Al mole fraction and the increase in the linewidth of the donor resonances from 7 mT for AlAs:Si to 14 mT for Al0.4Ga0.6As:Si indicate a breakdown of the independent-valley model employed to describe the symmetry of the donor ground state in Si-doped AlAs. Various mechanisms that can potentially influence the properties of the donor ground state in Si-doped Al(x)Ga(1-x)As with x < 1, such as a finite spin-valley interaction, L-X (or GAMMA-X) interband mixing, and alloy disorder, are discussed. The results for the Sn-doped AlAs and Al(x)Ga(1-x)As/GaAs heterostructures provide evidence that the optically active states revealed in these studies are much deeper compared to the Si donor states. C1 HOWARD UNIV,DEPT ELECT ENGN,WASHINGTON,DC 20059. NEC CORP LTD,FUNDAMENTAL RES LAB,TSUKUBA 305,JAPAN. IBM CORP,THOMAS J WATSON RES CTR,DIV RES,YORKTOWN HTS,NY 10598. RP GLASER, ER (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 48 TC 24 Z9 24 U1 0 U2 1 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD JUN 15 PY 1991 VL 43 IS 18 BP 14540 EP 14556 DI 10.1103/PhysRevB.43.14540 PG 17 WC Physics, Condensed Matter SC Physics GA FW755 UT WOS:A1991FW75500022 ER PT J AU MEYER, JR HOFFMAN, CA WAGNER, RJ BARTOLI, FJ AF MEYER, JR HOFFMAN, CA WAGNER, RJ BARTOLI, FJ TI TEMPERATURE-INDUCED INTRABAND TRANSITIONS IN THE N-TYPE HGTE/CDTE SUPERLATTICE - COMMENT SO PHYSICAL REVIEW B LA English DT Letter ID HGTE-CDTE SUPERLATTICES; VALENCE-BAND DISCONTINUITY; CYCLOTRON-RESONANCE; GAP; ELECTRON; TRANSPORT; HOLES AB On the basis of magneto-optical measurements on a HgTe-CdTe superlattice, Choi et al. [Phys. Rev. B 41, 10872 (1990)] have argued that the valence-band offset must be on the order of 40 meV. We show that rather than representing cyclotron resonance by electrons in the interior of the superlattice, the minima in their magnetotransmission spectra are more readily interpreted in terms of quasi-two-dimensional electrons residing near the interface of the superlattice with the substrate. When nonparabolicity is taken into account, the data are consistent with the large body of evidence favoring a large valence-band offset in this system. RP MEYER, JR (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 16 TC 5 Z9 5 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 JUN 15 PY 1991 VL 43 IS 18 BP 14715 EP 14717 DI 10.1103/PhysRevB.43.14715 PG 3 WC Physics, Condensed Matter SC Physics GA FW755 UT WOS:A1991FW75500044 ER PT J AU POLITZER, P MURRAY, JS LANE, P SJOBERG, P ADOLPH, HG AF POLITZER, P MURRAY, JS LANE, P SJOBERG, P ADOLPH, HG TI SHOCK-SENSITIVITY RELATIONSHIPS FOR NITRAMINES AND NITROALIPHATICS SO CHEMICAL PHYSICS LETTERS LA English DT Article ID THERMAL-DECOMPOSITION; ENERGETIC MATERIALS; DIMETHYLNITRAMINE AB For groups of nitramines and nitroaliphatics. taken separately, it is shown that shock sensitivity is related to the strengths of all of the N-NO2 and/or C-NO2 bonds in the molecule. taken in conjunction with its overall size. The reciprocals of the bond lengths are used as measures of bond strengths, while molecular weight is taken as the indicator of molecular size. Linear correlation coefficients of 0.94 and 0.98 are obtained, respectively, for nitramines and nitroaliphatics of a variety of structural types. These results are indicative of the importance of the N-NO2 and C-NO2 bonds in the shock-induced decomposition of nitramines and nitroaliphatics. C1 NOBEL CHEM AB,S-69185 KARLSKOGA,SWEDEN. USN,CTR SURFACE WARFARE,DIV ENERGET MAT,SILVER SPRING,MD 20903. RP POLITZER, P (reprint author), UNIV NEW ORLEANS,DEPT CHEM,NEW ORLEANS,LA 70148, USA. NR 24 TC 63 Z9 71 U1 0 U2 5 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 14 PY 1991 VL 181 IS 1 BP 78 EP 82 DI 10.1016/0009-2614(91)90225-X PG 5 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA FT272 UT WOS:A1991FT27200015 ER PT J AU TRITT, TM SKOVE, MJ EHRLICH, AC AF TRITT, TM SKOVE, MJ EHRLICH, AC TI DIRECT MEASUREMENT OF YOUNG MODULUS IN THE SLIDING AND NONSLIDING CDW STATE OF TAS3 SO SYNTHETIC METALS LA English DT Meeting Abstract RP TRITT, TM (reprint author), USN,RES LAB,MAT PHYS BRANCH,WASHINGTON,DC 20375, USA. NR 1 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 0379-6779 J9 SYNTHETIC MET JI Synth. Met. PD JUN 14 PY 1991 VL 43 IS 3 BP 3905 EP 3905 DI 10.1016/0379-6779(91)91706-G PG 1 WC Materials Science, Multidisciplinary; Physics, Condensed Matter; Polymer Science SC Materials Science; Physics; Polymer Science GA GA284 UT WOS:A1991GA28400070 ER PT J AU KASSIM, NE BAUM, SA WEILER, KW AF KASSIM, NE BAUM, SA WEILER, KW TI A NEW LOOK AT THE JET IN THE CTB-37A/B SUPERNOVA REMNANT COMPLEX SO ASTROPHYSICAL JOURNAL LA English DT Article DE NEBULAE, INDIVIDUAL (G348 + 0); NEBULAE, STRUCTURE; NEBULAE, SUPERNOVA REMNANTS ID TELESCOPE; SPECTRUM AB Very Large Array observations of the unusual southern Galactic supernova remnant (SNR) complex near l = 348-degrees, b = 0-degrees at wavelengths of 6, 20, and 90 cm are presented. Derived continuum spectra and observed morphologies indicate that G348.5 + 0.1 (CTB 37A) does not have a "jet" as reported by previous observers but is instead superposed on a second, previously unidentified SNR lying along the line of sight. This new SNR is designated G348.5 - 0.0 according to the usual convention. Other observers have also noted a faint, flat spectrum bridge of emission possibly connecting the G348.5 + 0.1/G348.5 - 0.0 superposition with a third nearby remnant G348.7 + 0.3 (CTB 37B). However, a connection appears unlikely, and we suggest that the "bridge" merely consists of faint emission which has "leaked" from the southeastern side of G348.7 + 0.3 and has no relation to the G348.5 + 0.1/G348.5 - 0.0 superposition. These new data also reveal a remarkable region of "blown-out" emission from the southwestern part of G348.5 + 0.1 which most likely reflects the presence of large-scale density inhomogeneities in the interstellar medium into which the SNR shell is expanding. C1 RADIOSTERRENWACHT DWINGELOO,7990 AA DWINGELOO,NETHERLANDS. JOHNS HOPKINS UNIV,BALTIMORE,MD 21218. RP KASSIM, NE (reprint author), USN,RES LAB,CTR ADV SPACE SENSING,NRL CODE 42153,WASHINGTON,DC 20375, USA. NR 24 TC 27 Z9 27 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 1991 VL 374 IS 1 BP 212 EP 217 DI 10.1086/170110 PN 1 PG 6 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA FP765 UT WOS:A1991FP76500020 ER PT J AU SHEELEY, NR AF SHEELEY, NR TI POLAR FACULAE - 1906-1990 SO ASTROPHYSICAL JOURNAL LA English DT Article DE SUN, ACTIVITY; SUN, FACULAE ID STRENGTH; FIELDS AB The numbers of faculae at the Sun's poles have been estimated from white-light images obtained at the Mount Wilson Observatory during 1970-1990 and have been combined with previous measurements extending back to 1906 when the observations began. The combined measurements now span four complete 22 year cycles and show the following: 1. The numbers of north and south polar faculae were approximately 50% larger around sunspot minimum in 1986 than in 1976, but were still smaller than some of the very large numbers that occurred near sunspot minima in earlier cycles. 2. In 1974, the number of south polar faculae exhibited a short-lived increase which coincided with the arrival of a surge of trailing-polarity flux at the pole. This suggests that similar poleward surges may have been responsible for previously unexplained bursts of faculae such as the one that occurred at the south pole in 1959. 3. The numbers of polar faculae have been highly correlated with the Wilcox Solar Observatory polar field strengths since these magnetic measurements began in 1976. RP SHEELEY, NR (reprint author), USN,RES LAB,EO HULBURT CTR SPACE RES,CODE 4172,WASHINGTON,DC 20375, USA. NR 10 TC 80 Z9 80 U1 1 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 1991 VL 374 IS 1 BP 386 EP 389 DI 10.1086/170129 PN 1 PG 4 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA FP765 UT WOS:A1991FP76500039 ER PT J AU MCBREEN, J OGRADY, WE TOURILLON, G DARTYGE, E FONTAINE, A AF MCBREEN, J OGRADY, WE TOURILLON, G DARTYGE, E FONTAINE, A TI XANES STUDY OF UNDERPOTENTIAL DEPOSITED COPPER ON CARBON-SUPPORTED PLATINUM SO JOURNAL OF ELECTROANALYTICAL CHEMISTRY LA English DT Article ID RAY ABSORPTION-SPECTROSCOPY; AD-ATOMS; ELECTROCHEMICAL INTERFACES; STRUCTURAL INVESTIGATIONS; ELECTROSORPTION VALENCY; SYNCHROTRON RADIATION; ELECTRONIC-STRUCTURE; QUARTZ MICROBALANCE; SURFACE EXAFS; CU AB Underpotential deposited (UPD) copper on carbon-supported platinum was investigated in-situ in 0.5 M H2SO4 at 0.05 V (SCE) by XANES (X-ray Absorption Near Edge Structure). By taking XANES spectra at the Cu K-edge and the Pt L(III)-edge it was possible to determine the valence state of the copper and observe modifications in the electronic structure of the platinum on adsorption of copper. The XANES for UPD copper shows that the adsorbed copper had an oxidation state close to Cu+. XANES features indicate strongly a tetrahedral coordination for the adsorbed Cu species. A reduction in intensity of the white line in the platinum XANES is consistent with a partial filling of empty Pt d-band vacancies on adsorption of copper. Thus, UPD species can modify the electronic structure of a platinum catalyst. The adsorbed Cu+ species are apparently associated with HSO4- ions. C1 USN,RES LAB,CODE 6170,WASHINGTON,DC 20375. CNRS,LAB UTILISAT RAYONNEMENT ELETROMAGNET,F-91405 ORSAY,FRANCE. RP MCBREEN, J (reprint author), BROOKHAVEN NATL LAB,DEPT APPL SCI,UPTON,NY 11973, USA. NR 66 TC 44 Z9 44 U1 0 U2 11 PU ELSEVIER SCIENCE SA LAUSANNE PI LAUSANNE 1 PA PO BOX 564, 1001 LAUSANNE 1, SWITZERLAND SN 0022-0728 J9 J ELECTROANAL CHEM JI J. Electroanal. Chem. PD JUN 10 PY 1991 VL 307 IS 1-2 BP 229 EP 240 DI 10.1016/0022-0728(91)85551-Y PG 12 WC Chemistry, Analytical; Electrochemistry SC Chemistry; Electrochemistry GA FU672 UT WOS:A1991FU67200018 ER PT J AU KELNER, G BINARI, S SHUR, M PALMOUR, J AF KELNER, G BINARI, S SHUR, M PALMOUR, J TI HIGH-TEMPERATURE OPERATION OF ALPHA-SILICON CARBIDE BURIED-GATE JUNCTION FIELD-EFFECT TRANSISTORS SO ELECTRONICS LETTERS LA English DT Article DE FIELD-EFFECT TRANSISTORS; SEMICONDUCTOR DEVICES AND MATERIALS; TRANSISTORS AB The high temperature operation of alpha-SiC buried-gate junction field-effect transistors is reported. Devices fabricated with a 4-mu-m gate length have a maximum transconductance of 17 mS/mm and a maximum drain saturation current of 450 mA/mm at room temperature. The devices are completely pinched off at a gate voltage of -40 V. Devices with a gate length of 39-mu-m have a transconductance of 5.4 mS/mm at room temperature which decreases to 1.7 mS/mm at 400-degrees-C. This decrease in transconductance is due to the reduction of mobility with increasing temperature. The values of transconductances at room temperature and at elevated temperatures are the highest reported for alpha-SiC JFETs. C1 UNIV VIRGINIA,DEPT ELECT ENGN,CHARLOTTESVILLE,VA 22903. CREE RES INC,DURHAM,NC 27713. RP KELNER, G (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. RI Shur, Michael/A-4374-2016 OI Shur, Michael/0000-0003-0976-6232 NR 11 TC 16 Z9 16 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 6 PY 1991 VL 27 IS 12 BP 1038 EP 1040 DI 10.1049/el:19910646 PG 3 WC Engineering, Electrical & Electronic SC Engineering GA FR440 UT WOS:A1991FR44000019 ER PT J AU LAROCCO, A OLDFIELD, EC AF LAROCCO, A OLDFIELD, EC TI CORTICOSTEROIDS AS ADJUNCTIVE THERAPY FOR PNEUMOCYSTIS PNEUMONIA IN PATIENTS WITH AIDS SO NEW ENGLAND JOURNAL OF MEDICINE LA English DT Letter RP LAROCCO, A (reprint author), USN HOSP,SAN DIEGO,CA 92134, USA. NR 1 TC 1 Z9 1 U1 0 U2 0 PU MASS MEDICAL SOC PI BOSTON PA 10 SHATTUCK, BOSTON, MA 02115 SN 0028-4793 J9 NEW ENGL J MED JI N. Engl. J. Med. PD JUN 6 PY 1991 VL 324 IS 23 BP 1668 EP 1668 PG 1 WC Medicine, General & Internal SC General & Internal Medicine GA FP307 UT WOS:A1991FP30700017 ER PT J AU GEIS, MW SMITH, HI ARGOITIA, A ANGUS, J MA, GHM GLASS, JT BUTLER, J ROBINSON, CJ PRYOR, R AF GEIS, MW SMITH, HI ARGOITIA, A ANGUS, J MA, GHM GLASS, JT BUTLER, J ROBINSON, CJ PRYOR, R TI LARGE-AREA MOSAIC DIAMOND FILMS APPROACHING SINGLE-CRYSTAL QUALITY SO APPLIED PHYSICS LETTERS LA English DT Article ID SILICON AB The seeding for large-area mosaic diamond films approaching single-crystal quality is described. The technique includes patterned etching of relief structures in Si substrates, deposition from a slurry and orientation of macroscopic diamond seed crystals in the structures, and chemical vapor deposition overgrowth of the diamond seeds to form a continuous film. The film comprises approximately 100-mu-m single crystals, which are separated by low-angle grain boundaries of a few degrees or less. We believe that these low-angle grain boundaries will not affect the electrical properties of majority-carrier devices. C1 MIT,DEPT ELECT ENGN & COMP SCI,CAMBRIDGE,MA 02139. CASE WESTERN RESERVE UNIV,DEPT CHEM ENGN,CLEVELAND,OH 44106. N CAROLINA STATE UNIV,MAT SCI & ENGN,RALEIGH,NC 27695. USN,RES LAB,WASHINGTON,DC 20375. RAYTHEON,LEXINGTON,MA 02173. WAYNE STATE UNIV,INST MFG RES,DETROIT,MI 48202. RP GEIS, MW (reprint author), MIT,LINCOLN LAB,LEXINGTON,MA 02173, USA. RI Butler, James/B-7965-2008; Glass, Jeffrey/A-2266-2010 OI Butler, James/0000-0002-4794-7176; Glass, Jeffrey/0000-0002-9554-4398 NR 17 TC 43 Z9 43 U1 1 U2 9 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 3 PY 1991 VL 58 IS 22 BP 2485 EP 2487 DI 10.1063/1.104851 PG 3 WC Physics, Applied SC Physics GA FP311 UT WOS:A1991FP31100010 ER PT J AU MEYER, JR ARNOLD, DJ HOFFMAN, CA BARTOLI, FJ AF MEYER, JR ARNOLD, DJ HOFFMAN, CA BARTOLI, FJ TI INTERFACE ROUGHNESS LIMITED ELECTRON-MOBILITY IN HGTE-CDTE SUPERLATTICES SO APPLIED PHYSICS LETTERS LA English DT Article ID QUANTUM-WELLS; LOW-TEMPERATURE; TRANSPORT; SCATTERING; HOLE AB We demonstrate that interface roughness is the dominant low-temperature scattering mechanism for electrons in HgTe-CdTe superlattices with thin wells. Not only do the experimental mobilities follow the expected d(w)6 dependence, but the observed temperature dependence is accurately reproduced by theory when the treatment of interface roughness scattering is generalized for narrow-gap superlattices. The fits to data yield roughness correlation lengths in the range 60-200 angstrom. RP MEYER, JR (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 18 TC 33 Z9 33 U1 2 U2 3 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0003-6951 J9 APPL PHYS LETT JI Appl. Phys. Lett. PD JUN 3 PY 1991 VL 58 IS 22 BP 2523 EP 2525 DI 10.1063/1.104840 PG 3 WC Physics, Applied SC Physics GA FP311 UT WOS:A1991FP31100023 ER PT J AU DOBISZ, EA MARRIAN, CRK AF DOBISZ, EA MARRIAN, CRK TI SUB-30-NM LITHOGRAPHY IN A NEGATIVE ELECTRON-BEAM RESIST WITH A VACUUM SCANNING TUNNELING MICROSCOPE SO APPLIED PHYSICS LETTERS LA English DT Article ID GAAS AB We report studies of minimum feature sizes in 50 nm films of the high-resolution negative electron beam resist, SAL-601-ER7 from the Shipley Corporation. Developed linewidths of 27 nm and line spacing of 55 nm, from center to center, were produced by lithography with a vacuum scanning tunneling microscope (STM). In contrast, a minimum linewidth of 95 nm was obtained from exposure with a 17 nm (l/e diameter) 50 kV electron beam. Patterns written in the STM at electron energies down to 15 eV were visible in the developed resist. The limit at 15 eV is related to the operation of the STM and does not represent an exposure threshold energy for the resist. RP DOBISZ, EA (reprint author), USN,RES LAB,CODE 6864,DIV ELECTR SCI & TECHNOL,4555 OVERLOOK AVE,WASHINGTON,DC 20375, USA. NR 16 TC 69 Z9 69 U1 0 U2 5 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0003-6951 J9 APPL PHYS LETT JI Appl. Phys. Lett. PD JUN 3 PY 1991 VL 58 IS 22 BP 2526 EP 2528 DI 10.1063/1.104841 PG 3 WC Physics, Applied SC Physics GA FP311 UT WOS:A1991FP31100024 ER PT J AU CHEN, CH FANG, ZM STRINGFELLOW, GB GEDRIDGE, RW AF CHEN, CH FANG, ZM STRINGFELLOW, GB GEDRIDGE, RW TI TRIISOPROPYLANTIMONY FOR ORGANOMETALLIC VAPOR-PHASE EPITAXIAL-GROWTH OF GASB AND INSB SO APPLIED PHYSICS LETTERS LA English DT Article ID PHOTOLUMINESCENCE; ALLOY; GAAS AB In the past, trimethylantimony (TMSb) has been almost exclusively used as the Sb source in organometallic vapor phase epitaxy (OMVPE). However, TMSb decomposes at relatively high temperatures (above 500-degrees-C). For growth at lower temperatures, TMSb is not an optimum choice. In addition, TMSb decomposition produces methyl radicals, a source for carbon contamination. Thus, it is important to investigate alternative Sb precursors. In this letter, we report the use of a newly developed Sb source, triisopropylantimony (TIPSb), for atmospheric pressure OMVPE. It is found that both GaSb and InSb can be grown with good surface morphologies at temperatures between 430 and 600-degrees-C. The high growth efficiencies indicate that there are few parasitic reactions between TIPSb and trimethylgallium (TMGa) or trimethylindium (TMIn). The GaSb layers grown at 500-degrees-C have background hole concentrations of 2 X 10(16) cm-3. Low-temperature photoluminescence (PL) measurements indicate that the acceptor is due to Sb vacancies rather than carbon acceptors. The InSb epilayers have electron concentrations of about 5 X 10(16) cm-3 at 77 K and low-temperature PL shows well-resolved exciton and acceptor-related peaks. These results indicate that TIPSb is a viable source for the OMVPE growth of Sb-containing III-V semiconductors. C1 USN,CTR WEAP,DEPT RES,DIV CHEM,CHINA LAKE,CA 93555. RP CHEN, CH (reprint author), UNIV UTAH,DEPT MAT SCI & ENGN,SALT LAKE CITY,UT 84112, USA. NR 20 TC 21 Z9 21 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 3 PY 1991 VL 58 IS 22 BP 2532 EP 2534 DI 10.1063/1.104817 PG 3 WC Physics, Applied SC Physics GA FP311 UT WOS:A1991FP31100026 ER PT J AU VOHRA, ST BUCHOLTZ, F KOO, KP DAGENAIS, DM AF VOHRA, ST BUCHOLTZ, F KOO, KP DAGENAIS, DM TI UNIVERSAL NOISE RISE IN A PARAMETRIC MAGNETOSTRICTIVE AMPLIFIER SO PHYSICAL REVIEW LETTERS LA English DT Article ID JOSEPHSON-JUNCTIONS; BOUNCING-BALL; SUPPRESSION; SYSTEMS; AMPLIFICATION; BIFURCATION AB Noise rise in the high-gain limit of a parametric magnetostrictive amplifier is observed to occur close to the bifurcation point of the unperturbed strain dynamics. This work presents the first quantitative agreement between experimental results and the predicted universal scaling laws which relate the signal and noise gain to the bifurcation parameter. We also observe a scaling law, not predicted by the theory, in which the point of maximum signal gain shifts away from the bifurcation point as a function of the detuning with a critical exponent equal to -0.33 +/- 0.04. RP VOHRA, ST (reprint author), USN,RES LAB,CODE 6570,WASHINGTON,DC 20375, USA. NR 13 TC 11 Z9 11 U1 1 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 JUN 3 PY 1991 VL 66 IS 22 BP 2843 EP 2846 DI 10.1103/PhysRevLett.66.2843 PG 4 WC Physics, Multidisciplinary SC Physics GA FP085 UT WOS:A1991FP08500002 ER PT J AU PANDE, CS DANTSKER, E AF PANDE, CS DANTSKER, E TI ON A STOCHASTIC-THEORY OF GRAIN-GROWTH .3. SO ACTA METALLURGICA ET MATERIALIA LA English DT Article ID COMPUTER-SIMULATION; SIZE DISTRIBUTION; 3 DIMENSIONS AB The stochastic theory of grain growth proposed previously [C. S. Pande, Acta metall. 35, 2671 (1987)] is examined and discussed in the light of a recent criticism [N. Ryum and O. Hunderi, Acta metall. 37, 1375 (1989)]. We show that the theory is able to answer all major objections raised by Ryum and Hunderi. In particular we develop further the stochastic theory utilizing an N dimensional diffusion term, (N = 1, 2, or 3) and show mathematically that for N = 3 the volume of the specimen is strictly conserved. The grain size distribution is obtained for three dimensions in closed analytical form and is found to be approximately lognormal, in good agreement with experiments. C1 GEOCENTERS INC, FT WASHINGTON, MD USA. RP PANDE, CS (reprint author), USN, RES LAB, WASHINGTON, DC 20375 USA. NR 23 TC 22 Z9 23 U1 0 U2 0 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLAND SN 0956-7151 J9 ACTA METALL MATER JI Acta Metall. Mater. PD JUN PY 1991 VL 39 IS 6 BP 1359 EP 1365 DI 10.1016/0956-7151(91)90223-N PG 7 WC Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Materials Science; Metallurgy & Metallurgical Engineering GA FT192 UT WOS:A1991FT19200035 ER PT J AU ABELS, R AF ABELS, R TI WAR AND SOCIETY IN MEDIEVAL CHESHIRE, 1277-1403 - MORGAN,P SO AMERICAN HISTORICAL REVIEW LA English DT Book Review RP ABELS, R (reprint author), USN ACAD,ANNAPOLIS,MD 21402, USA. NR 1 TC 0 Z9 0 U1 0 U2 0 PU AMER HISTORICAL REVIEW PI WASHINGTON PA 400 A ST SE, WASHINGTON, DC 20003 SN 0002-8762 J9 AM HIST REV JI Am. Hist. Rev. PD JUN PY 1991 VL 96 IS 3 BP 855 EP 856 DI 10.2307/2162478 PG 2 WC History SC History GA FU136 UT WOS:A1991FU13600057 ER PT J AU DEVANEY, K JAFFE, ES AF DEVANEY, K JAFFE, ES TI THE SURGICAL PATHOLOGY OF GASTROINTESTINAL HODGKINS-DISEASE SO AMERICAN JOURNAL OF CLINICAL PATHOLOGY LA English DT Article ID TUMOR-ASSOCIATED EOSINOPHILIA; REED-STERNBERG CELLS; MONOCLONAL-ANTIBODIES; MALIGNANT-LYMPHOMA; LEU-M1; TRACT; DIAGNOSIS; AUTOPSY; TISSUES AB The files of the National Cancer Institute were searched for all surgical specimens from the gastrointestinal (GI) tract with the diagnosis of Hodgkin's disease (HD) that were accessioned during the years 1953-1990; six patients with a histologically reconfirmed diagnosis were identified. Of these patients, four presented with GI HD and two had recurrent HD. Primary HD appeared in the stomach (three patients) and the duodenum (one patient); recurrent HD after diagnosis in a conventional nodal site appeared in the stomach (one patient) and the colon (one patient). One of the cases of primary gastric disease was a composite lymphoma consisting of HD and diffuse large cell lymphoma. In view of the rarity of GI tract involvement by HD, a diagnosis of primary GI HD should be viewed with skepticisms; support for such a diagnosis may be provided by both classic histopathologic features of HD and immunostaining, but no single feature can be regarded as pathognomonic. C1 NCI,PATHOL LAB,BLDG 10,ROOM 2N202,BETHESDA,MD 20892. USN HOSP,DEPT PATHOL,BETHESDA,MD 20814. NR 31 TC 32 Z9 34 U1 0 U2 0 PU LIPPINCOTT-RAVEN PUBL PI PHILADELPHIA PA 227 EAST WASHINGTON SQ, PHILADELPHIA, PA 19106 SN 0002-9173 J9 AM J CLIN PATHOL JI Am. J. Clin. Pathol. PD JUN PY 1991 VL 95 IS 6 BP 794 EP 801 PG 8 WC Pathology SC Pathology GA FP776 UT WOS:A1991FP77600009 PM 2042588 ER PT J AU TRAVIS, WD LINNOILA, RI TSOKOS, MG HITCHCOCK, CL CUTLER, GB NIEMAN, L CHROUSOS, G PASS, H DOPPMAN, J AF TRAVIS, WD LINNOILA, RI TSOKOS, MG HITCHCOCK, CL CUTLER, GB NIEMAN, L CHROUSOS, G PASS, H DOPPMAN, J TI NEUROENDOCRINE TUMORS OF THE LUNG WITH PROPOSED CRITERIA FOR LARGE-CELL NEUROENDOCRINE CARCINOMA - AN ULTRASTRUCTURAL, IMMUNOHISTOCHEMICAL, AND FLOW CYTOMETRIC STUDY OF 35 CASES SO AMERICAN JOURNAL OF SURGICAL PATHOLOGY LA English DT Article DE CARCINOID; ATYPICAL CARCINOID; SMALL-CELL CARCINOMA; NEUROENDOCRINE CARCINOMA; LARGE-CELL NEUROENDOCRINE CARCINOMA; KULCHITSKY CELL CARCINOMA; CUSHINGS SYNDROME; MULTIPLE ENDOCRINE NEOPLASIA ID NEURO-ENDOCRINE NEOPLASMS; HUMAN CHORIONIC-GONADOTROPIN; GASTRIN-RELEASING PEPTIDE; BRONCHIAL CARCINOIDS; CARCINOEMBRYONIC ANTIGEN; INTERMEDIATE FILAMENTS; EXPRESSION; CANCER; ACTH; DIFFERENTIATION AB Based on our review of 35 cases and the literature, we found the spectrum of pulmonary neuroendocrine (NE) tumors to be too broad to fit into the traditional three-category classification scheme of typical carcinoid (TC), atypical carcinoid (AC), and small-cell lung carcinoma (SCLC). We found that a spectrum of high- and low-grade tumors exist between TC and SCLC and that in the past many of these tumors have been called AC. We chose to adhere to Arrigoni's definition of AC, as his original criteria characterized a low-grade tumor. For the higher grade non-small-cell tumors (NSCLC), we propose a fourth category of large-cell neuroendocrine carcinoma (LCNEC), which is characterized by: (a) light microscopic NE appearance; (b) cells of large size, polygonal shape, low nuclear-cytoplasmic ratio (N:C), coarse nuclear chromatin, and frequent nucleoli; (c) high mitotic rate [> 10/10 high-power fields (HPF)] and frequent necrosis; and (d) NE features by immunohistochemistry (IHC) or electron microscopy (EM). Thus, after deciding that a pulmonary NE tumor is high grade, the major diagnostic issue is separation of LCNEC from SCLC. This distinction is based not only on cell size, but on a variety of morphologic features. We studied 20 TC, six AC, five LCNEC, and four SCLC and characterized the clinical, light microscopic, EM, IHC, and flow cytometric features of each type of tumor. We did not find any advantage to IHC, EM, or flow cytometry over light microscopy in the subclassification or prediction of prognosis; however, these methods were useful in characterizing these four types of pulmonary NE tumors and in demonstrating their NE properties. LCNEC must be distinguished from a fifth category pulmonary NE tumor: NSCLC with NE features in which NE differentiation is not evident by light microscopy and must be demonstrated by EM or IHC. Although the prognosis of LCNEC appears to be intermediate between AC and SCLC, larger numbers of patients will be needed to demonstrate significant differences in survival. C1 NICHHD, SURG BRANCH, BETHESDA, MD 20892 USA. NICHHD, DEV ENDOCRINOL BRANCH, BETHESDA, MD 20892 USA. NIH, WARREN G MAGNUSON CLIN CTR, DEPT DIAGNOST RADIOL, BETHESDA, MD 20892 USA. ARMED FORCES INST PATHOL, DEPT CELLULAR PATHOL, WASHINGTON, DC 20306 USA. USN HOSP, PATHOL LAB, BETHESDA, MD 20814 USA. USN HOSP, NCI, NAVY MED ONCOL BRANCH, BETHESDA, MD 20814 USA. NR 91 TC 501 Z9 525 U1 0 U2 6 PU LIPPINCOTT WILLIAMS & WILKINS PI PHILADELPHIA PA TWO COMMERCE SQ, 2001 MARKET ST, PHILADELPHIA, PA 19103 USA SN 0147-5185 EI 1532-0979 J9 AM J SURG PATHOL JI Am. J. Surg. Pathol. PD JUN PY 1991 VL 15 IS 6 BP 529 EP 553 DI 10.1097/00000478-199106000-00003 PG 25 WC Pathology; Surgery SC Pathology; Surgery GA FM530 UT WOS:A1991FM53000003 PM 1709558 ER PT J AU LEIVERS, D AF LEIVERS, D TI A COMPLICATION FOLLOWING PROPHYLACTIC BLOOD PATCH - SPINAL OR SUBDURAL ANESTHESIA - REPLY SO ANESTHESIOLOGY LA English DT Letter RP LEIVERS, D (reprint author), USN HOSP,SAN DIEGO,CA 92134, USA. NR 3 TC 0 Z9 0 U1 0 U2 0 PU LIPPINCOTT-RAVEN PUBL PI PHILADELPHIA PA 227 EAST WASHINGTON SQ, PHILADELPHIA, PA 19106 SN 0003-3022 J9 ANESTHESIOLOGY JI Anesthesiology PD JUN PY 1991 VL 74 IS 6 BP 1167 EP 1167 DI 10.1097/00000542-199106000-00047 PG 1 WC Anesthesiology SC Anesthesiology GA FR380 UT WOS:A1991FR38000047 ER PT J AU DAWSON, TH KRIEBEL, DL WALLENDORF, LA AF DAWSON, TH KRIEBEL, DL WALLENDORF, LA TI EXPERIMENTAL-STUDY OF WAVE GROUPS IN DEEP-WATER RANDOM WAVES SO APPLIED OCEAN RESEARCH LA English DT Article DE WAVE GROUPS; WAVE ENVELOPE; WAVE STATISTICS; RANDOM WAVES AB Results from a laboratory study of wave groups in random seas are presented for Bretschneider and JONSWAP sea states. A distinction is made between general crest-envelope crossings of a threshold level and those involving groups of two or more wave crests. Measurements show that the average duration of a run of high waves in groups and the average interval between such groups are significantly greater than the values found for general envelope crossings, since many large waves occur by themselves and not in groups. Experimental results for these average values, as well as for probability density functions of time durations and intervals, are found to be characterized broadly by linear similarity relationships, with non-linear effects of enhanced crest amplitudes altering this similarity at high threshold levels. Average envelope durations and intervals are then shown to be consistent with standard envelope theory of random waves when used with parameters derived from truncated amplitude spectra and non-linear crest statistics. Probability density distributions for envelope durations and intervals are shown to be described approximately by Gamma functions rather than the commonly assumed exponential function. Average durations and intervals for groups of two or more wave crests, as well as their associated probability density functions, are also shown to be theoretically related to the corresponding envelope statistics. RP DAWSON, TH (reprint author), USN ACAD,ANNAPOLIS,MD 21402, USA. NR 0 TC 13 Z9 14 U1 0 U2 2 PU ELSEVIER SCI LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, OXON, ENGLAND OX5 1GB SN 0141-1187 J9 APPL OCEAN RES JI Appl. Ocean Res. PD JUN PY 1991 VL 13 IS 3 BP 116 EP 131 DI 10.1016/S0141-1187(05)80059-8 PG 16 WC Engineering, Ocean; Oceanography SC Engineering; Oceanography GA GA237 UT WOS:A1991GA23700002 ER PT J AU GORMAN, L THOMAS, GW AF GORMAN, L THOMAS, GW TI ENLISTMENT MOTIVATIONS OF ARMY RESERVISTS - MONEY, SELF-IMPROVEMENT, OR PATRIOTISM SO ARMED FORCES & SOCIETY LA English DT Article AB Although a number of researchers have examined active-force enlistment at both the aggregate and individual levels, relatively little work has been done on reserve enlistment motivations at the individual level. This study uses a log-linear model to profile the self-reported motivations of male U.S. Army Reserve recruits as a function of age, educational attainment, mental category, and plans to transfer to the active Army. The empirical results suggest that there are several differently motivated subgroups of Army Reserve recruits and that the Army Reserve may play a significant role in active-Army recruiting. RP GORMAN, L (reprint author), USN,POSTGRAD SCH,DEPT ADM SCI,MONTEREY,CA 93943, USA. NR 13 TC 8 Z9 8 U1 0 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 1991 VL 17 IS 4 BP 589 EP 599 DI 10.1177/0095327X9101700405 PG 11 WC Political Science; Sociology SC Government & Law; Sociology GA HB560 UT WOS:A1991HB56000005 ER PT J AU MOZURKEWICH, D JOHNSTON, KJ SIMON, RS BOWERS, PF GAUME, R HUTTER, DJ COLAVITA, MM SHAO, M PAN, XP AF MOZURKEWICH, D JOHNSTON, KJ SIMON, RS BOWERS, PF GAUME, R HUTTER, DJ COLAVITA, MM SHAO, M PAN, XP TI ANGULAR DIAMETER MEASUREMENTS OF STARS SO ASTRONOMICAL JOURNAL LA English DT Article ID ALPHA-ORIONIS; SPECKLE INTERFEROMETRY; GIANT AB Angular diameters determined with the Mark III Optical Interferometer are presented for 12 stars at wavelengths of 450 and 800 nm. The uniform disk diameters resulting from fits to the visibility observations have rms residuals of order 1% for the 800 nm measurements and less than 3% for the 450 nm measurements. The improvement over previous observations with this instrument is due to improved data analysis and the use of a wider range of baseline lengths. An analysis of the calibration systematics for the Mark III Optical Interferometer is included. There is good agreement between these measurements and previously published data. The changes in uniform disk diameter between wavelengths of 450 and 800 nm agree with models of stellar atmospheres. C1 USN OBSERV, DEPT ASTROMETRY, WASHINGTON, DC 20392 USA. CALTECH, JET PROP LAB, PASADENA, CA 91109 USA. CALTECH, DEPT ASTRON, PASADENA, CA 91125 USA. RP USN, RES LAB, CTR ADV SPACE SENSING, CODE 4215, WASHINGTON, DC 20375 USA. NR 23 TC 155 Z9 155 U1 0 U2 2 PU IOP PUBLISHING LTD PI BRISTOL PA TEMPLE CIRCUS, TEMPLE WAY, BRISTOL BS1 6BE, ENGLAND SN 0004-6256 EI 1538-3881 J9 ASTRON J JI Astron. J. PD JUN PY 1991 VL 101 IS 6 BP 2207 EP 2219 DI 10.1086/115843 PG 13 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA FN636 UT WOS:A1991FN63600024 ER PT J AU RUSSELL, JL JOHNSTON, KJ MA, C SHAFFER, D DEVEGT, C AF RUSSELL, JL JOHNSTON, KJ MA, C SHAFFER, D DEVEGT, C TI A RADIO OPTICAL REFERENCE FRAME .2. ADDITIONAL RADIO AND OPTICAL SOURCE POSITIONS IN THE NORTHERN-HEMISPHERE SO ASTRONOMICAL JOURNAL LA English DT Article ID ASTROMETRY; VLBI; EMISSION; CATALOG; SYSTEMS; STARS AB VLBI observations from 12 sessions have been made of a total of 103 sources north of - 2-degrees declination. These data give the first extension to the radio/optical reference frame catalog already defined by the data in the NASA Crustal Dynamics Project database prior to July 1988 [Ma et al., AJ, 90, 1284 (1990)]. The new observations add 53 new sources to the radio reference frame catalog, improve the positions of 29 from the previous version, and show another seven sources to be unsuitable reference frame objects. Observations of 14 calibration sources tie the new positions to the existing catalog. The formal mean errors for the radio positions of the additional sources are about 0.8 mas in each coordinate. Optical positions for eight sources have been measured in the FK5 system, bringing the total number of sources in the catalog with accurate positions for their optical counterparts to 36. The new optical positions have an accuracy of about 50 mas. C1 APPL RES CORP,LANDOVER,MD 20785. NASA,GODDARD SPACE FLIGHT CTR,CODE 9219,GREENBELT,MD 20771. INTERFEROMET INC,VIENNA,VA 22182. UNIV HAMBURG,HAMBURGER STERNWARTE,W-2000 HAMBURG 13,GERMANY. RP RUSSELL, JL (reprint author), USN,RES LAB,CODE 4200,WASHINGTON,DC 20375, USA. RI Ma, Chopo/D-4751-2012 NR 22 TC 21 Z9 21 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 1991 VL 101 IS 6 BP 2266 EP 2273 DI 10.1086/115848 PG 8 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA FN636 UT WOS:A1991FN63600029 ER PT J AU STONE, RC MONET, DG BIRD, AR AF STONE, RC MONET, DG BIRD, AR TI A CCD SYSTEM FOR READING CIRCLES IN WIDE-ANGLE ASTROMETRY SO ASTRONOMICAL JOURNAL LA English DT Article ID CHARGE-COUPLED-DEVICES; ASTRONOMY AB This paper describes a CCD circle reading system developed for the USNO (Flagstaff) transit telescope. Circle readings are needed for the determination of declinations in wide-angle astrometry. The detectors are commercially available Philips CCD-TV imaging cameras, which can produce digital images every 1/15 of a second. The positions of division marks on the circle are determined by fitting a function to their profiles. This reading system is very accurate (+/- 0.007 arcsec), fast, and extremely reliable. Also, since the digital output is two-dimensional, the radial positions of division marks on a circle can also be determined, but with lower accuracy (+/- 1.2-mu-m). RP STONE, RC (reprint author), USN OBSERV,FLAGSTAFF STN,POB 1149,FLAGSTAFF,AZ 86002, 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 0004-6256 J9 ASTRON J JI Astron. J. PD JUN PY 1991 VL 101 IS 6 BP 2311 EP 2316 DI 10.1086/115852 PG 6 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA FN636 UT WOS:A1991FN63600033 ER PT J AU KEENAN, FP DUFTON, PL BOYLAN, MB KINGSTON, AE WIDING, KG AF KEENAN, FP DUFTON, PL BOYLAN, MB KINGSTON, AE WIDING, KG TI FE-XIV LINE RATIOS IN THE SUN SO ASTROPHYSICAL JOURNAL LA English DT Article DE ATOMIC PROCESSES; SUN; FLARES; SUN; SPECTRA; ULTRAVIOLET; SPECTRA ID ELECTRON-DENSITY DIAGNOSTICS; 7 2-RIBBON FLARE; SOLAR-FLARES; S-IV; XUV OBSERVATIONS; COMPACT FLARE; ENERGY-LEVELS; EXCITATION; TRANSITION; SKYLAB AB Recent R-matrix calculations of electron-impact excitation rates for Fe XIV are used to derive theoretical electron density-sensitive emission-line ratios involving transitions in the wavelength range 211-274 angstrom. Electron densities deduced from the observed line ratios for solar flares and active regions, obtained with the Naval Research Laboratory's SO82A slitless spectrograph on board Skylab, are in excellent internal agreement and, furthermore, compare favorably with densities determined independently from line ratios in Fe XII and Fe XIII. These results provide experimental support for the accuracy of the atomic data adopted in the analysis, as well as for the techniques used to calculate the line ratios. C1 QUEENS UNIV BELFAST,DEPT APPL MATH & THEORET PHYS,BELFAST BT7 1NN,ANTRIM,NORTH IRELAND. USN,RES LAB,EO HULBURT CTR SPACE RES,WASHINGTON,DC 20375. RP KEENAN, FP (reprint author), QUEENS UNIV BELFAST,DEPT PURE & APPL PHYS,BELFAST BT7 1NN,ANTRIM,NORTH IRELAND. NR 35 TC 21 Z9 21 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 1991 VL 373 IS 2 BP 695 EP 698 DI 10.1086/170090 PN 1 PG 4 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA FM779 UT WOS:A1991FM77900037 ER PT J AU LURIA, SM NERI, DF SHIM, MJ BIVENOUR, R AF LURIA, SM NERI, DF SHIM, MJ BIVENOUR, R TI EFFECT OF EXTRANEOUS TARGETS ON IDENTIFICATION OF COLOR-CODED TARGETS SO AVIATION SPACE AND ENVIRONMENTAL MEDICINE LA English DT Article ID DISPLAYS AB Subjects matched the color of a vertical target line, presented in 1 of 10 colors, to a set of 10 colors. The target line was presented either in isolation or together with 5 additional colored lines. Neither mean reaction time nor the number of matching errors increased when the extraneous lines were present, and the types of color confusions did not change systematically. C1 USN,AEROSP MED RES LAB,PENSACOLA,FL. UNIV HAWAII MANOA,HONOLULU,HI 96822. EASTERN CONNECTICUT STATE UNIV,WILLIMANTIC,CT 06226. RP LURIA, SM (reprint author), USN,SUBMARINE MED RES LAB,DEPT BEHAV SCI,NAVAL SUBMARINE BASE,GROTON,CT 06349, USA. NR 9 TC 0 Z9 0 U1 0 U2 2 PU AEROSPACE MEDICAL ASSOC PI ALEXANDRIA PA 320 S HENRY ST, ALEXANDRIA, VA 22314-3579 SN 0095-6562 J9 AVIAT SPACE ENVIR MD JI Aviat. Space Environ. Med. PD JUN PY 1991 VL 62 IS 6 BP 532 EP 537 PG 6 WC Public, Environmental & Occupational Health; Medicine, General & Internal; Sport Sciences SC Public, Environmental & Occupational Health; General & Internal Medicine; Sport Sciences GA FP096 UT WOS:A1991FP09600005 PM 1859340 ER PT J AU WHINNERY, JE AF WHINNERY, JE TI COMMENTS ON ASYMMETRIC VISUAL-LOSS ASSOCIATED WITH +GZ-STRESS SO AVIATION SPACE AND ENVIRONMENTAL MEDICINE LA English DT Note RP WHINNERY, JE (reprint author), USN,CTR AIR DEV,AERIAL COMBAT MANEUVERING ENHANCEMENT LAB,WARMINSTER,PA 18974, USA. NR 2 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 JUN PY 1991 VL 62 IS 6 BP 575 EP 576 PG 2 WC Public, Environmental & Occupational Health; Medicine, General & Internal; Sport Sciences SC Public, Environmental & Occupational Health; General & Internal Medicine; Sport Sciences GA FP096 UT WOS:A1991FP09600014 PM 1859347 ER PT J AU PARRY, RL CHIN, TW DONAHOE, PK AF PARRY, RL CHIN, TW DONAHOE, PK TI COMPUTER-AIDED CELL COLONY COUNTING SO BIOTECHNIQUES LA English DT Article ID NUDE-MICE; GROWTH AB Counting cell colonies is a tedious task when performed with the light microscope. Moreover, unless strict double-blind protocols are adhered to, biased counts are difficult to avoid. Presented here is a computer software application that performs accurate, reproducible cell colony counts with a minimum of user generated bias. The application is based upon the Apple(R) IICX computer system with Image software and AppleScan(R). Colonies are grown on 24-well plates and prepared in such a way as to permit good quality scanning. The scans are then transferred to Image and the individual colonies in each well are counted. Good correlation with counts done by light microscopy is achieved. C1 USN HOSP,BETHESDA,MD 20814. RP PARRY, RL (reprint author), MASSACHUSETTS GEN HOSP,PEDIAT SURG RES LAB,WARREN 11,BOSTON,MA 02114, USA. NR 4 TC 14 Z9 14 U1 0 U2 0 PU EATON PUBLISHING CO PI NATICK PA 154 E. CENTRAL ST, NATICK, MA 01760 SN 0736-6205 J9 BIOTECHNIQUES JI Biotechniques PD JUN PY 1991 VL 10 IS 6 BP 772 EP 774 PG 3 WC Biochemical Research Methods; Biochemistry & Molecular Biology SC Biochemistry & Molecular Biology GA FQ809 UT WOS:A1991FQ80900017 PM 1878212 ER PT J AU MANDERINO, GL LEICHT, JC MULSHINE, JL GOOCH, GT AF MANDERINO, GL LEICHT, JC MULSHINE, JL GOOCH, GT TI CROSS VALIDATION OF CLUSTER-ANALYSIS USING IMMUNOSTAINED MULTI-TISSUE TUMOR BLOCK SLIDES SO BRITISH JOURNAL OF CANCER LA English DT Article; Proceedings Paper CT 2ND INTERNATIONAL WORKSHOP ON SMALL CELL LUNG CANCER ANTIGENS CY APR, 1990 CL ROYAL SOC MED, LONDON, ENGLAND SP UK COORDINATING COMM CANC RES, ABBOTT LABS, CENTOCOR, DAKO LABS, BOEHRINGER MANNHEIM HO ROYAL SOC MED ID MUCIN-TYPE GLYCOPROTEIN; MAB A-80; EXPRESSION; CANCER AB We assayed the panel of SCLC MAbs using multi-tissue tumour block (MTTB) slides obtained from Dr Hector Battifora (City of Hope Hospital, Duarte CA). MTTB slides contain up to 100 different formalin-fixed tumour tissue specimens and can be immunostained with as little as 50-mu-l of antibody solution. In this study, the MAbs in the SCLC panel were used to stain slides from a MTTB comprised of eight normal, ten SCLC, ten squamous cell, ten adenocarcinoma and five undifferentiated lung cancer tissues. Many MAbs in the SCLC panel failed to immunostain the lung MTTB whereas many others showed significant immunoreactivity. Of those MAbs that stained SCLC tissue, none was found to be specific; these MAbs also stained NSCLC tissues or normal lung tissues. Some MAbs in the panel immunostained SCLC and NSCLC tissues, but were also reactive to normal lung tissue as well as other normal tissue specimens. A major advantage of immunostaining MTTBs with a panel of MAbs is that we were able to compare the immunoreactivity of the MAbs on a total of 128 different tissues requiring only 100-mu-l of antibody solution using only two MTTB slides per MAb. Although this study was preliminary and certain technical problems in assembling the MTTB as well as optimising the immunostaining procedure for handling 98 or more MAbs simultaneously remain, the MTTB technique remains promising. C1 USN,MED CTR,NCI,MED ONCOL BRANCH,BETHESDA,MD 20814. RP MANDERINO, GL (reprint author), ABBOTT LABS,DEPT CANC RES & IMMUNOL,D-90C,N CHICAGO,IL 60064, USA. NR 7 TC 0 Z9 0 U1 0 U2 0 PU STOCKTON PRESS PI BASINGSTOKE PA HOUNDMILLS, BASINGSTOKE, HAMPSHIRE, ENGLAND RG21 6XS SN 0007-0920 J9 BRIT J CANCER JI Br. J. Cancer PD JUN PY 1991 VL 63 SU 14 BP 60 EP 63 PG 4 WC Oncology SC Oncology GA FP061 UT WOS:A1991FP06100017 ER PT J AU GUHA, S PEEBLES, D WIETING, JT AF GUHA, S PEEBLES, D WIETING, JT TI RAMAN AND INFRARED STUDIES OF CUPRIC OXIDE SO BULLETIN OF MATERIALS SCIENCE LA English DT Article DE RAMAN; INFRARED; CUPRIC OXIDE AB Polarized Raman and fourier-transform infrared (FTIR) measurements have been made on a single crystal of CuO. Group theory predicts nine vibrations of which three (A(g), 2B(g)) are Raman-active and six (3A(u), 3B(u)) are infrared-active. We have observed three Raman modes at 296 (A(g)), 346 (B(g)1) and 636 (B(g)2) cm-1. We have also observed six infrared modes at 146 (B(u)3), 164 (A(u)2), 355 (A(u)3), 480 (B(u)1), 542 (?) and 603 (B(u)2) cm-1. The normal frequencies and eigenvectors have been calculated using Wilson's FG method; a good fit between theory and experiment has been obtained. RP GUHA, S (reprint author), US NAVAL RES LAB,CODE 4652,WASHINGTON,DC 20375, USA. NR 0 TC 9 Z9 9 U1 1 U2 8 PU INDIAN ACADEMY SCIENCES PI BANGALORE PA P B 8005 C V RAMAN AVENUE, BANGALORE 560 080, INDIA SN 0250-4707 J9 B MATER SCI JI Bull. Mat. Sci. PD JUN PY 1991 VL 14 IS 3 BP 539 EP 543 DI 10.1007/BF02744682 PG 5 WC Materials Science, Multidisciplinary SC Materials Science GA GB278 UT WOS:A1991GB27800003 ER PT J AU SOTO, MR PAGE, M MCKEE, ML AF SOTO, MR PAGE, M MCKEE, ML TI THEORETICAL-STUDY OF THE REACTION OF OH WITH HNO SO CHEMICAL PHYSICS LA English DT Article ID BASIS SETS; MOLECULES AB A complete-active-space (CAS) multiconfiguration self-consistent field (MCSCF) wavefunction with a polarized correlation-consistent basis set was used to determine the stationary points on the OH + HNO potential energy surface. The single-point energies were determined with a multireference configuration interaction (MRCI) wavefunction consisting of single and double excitations from selected configurations chosen from the reference wavefunction. Saddle points were confirmed at the five-electron, five-active-orbital CASSCF level by calculating analytical second derivatives. Segments of the minimum-energy paths (MEPs) for the hydrogen abstraction reaction and for the radical addition to nitrogen were calculated. It was found that the zero-point energy contribution for the abstraction pathway increases as one moves away from the MCSCF saddle point toward the reactants. An evaluation of the MRCI energy and the MCSCF zero-point energy contribution on the MEP at a few points towards the reactants suggests that the true transition state is earlier than the computed MCSCF saddle point, and that abstraction occurs with little or no activation barrier. At the MRCI level, the maximum in the vibrationally adiabatic potential along the MEP for the addition of OH to the nitrogen of HNO occurs at 5.6 kcal mol-1 above the reactants and, like the abstraction, this structure is earlier than the MCSCF saddle point. The resulting product of the OH addition, HN(O)OH, is not expected to decompose to H + HONO because the barrier to H elimination (31.4 kcal mol-1) is significantly higher than the barrier for the reaction back to OH + HNO (20.3 kcal mol-1). Statistical rate calculations have been performed for the abstraction and addition reactions, and the results are fitted to standard three-parameter temperature-dependent rate expressions. C1 AUBURN UNIV,DEPT CHEM,AUBURN,AL 36849. RP SOTO, MR (reprint author), USN,RES LAB,COMPUTAT PHYS & FLUID DYNAM LAB,CODE 4410,WASHINGTON,DC 20375, USA. NR 27 TC 18 Z9 18 U1 2 U2 3 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0301-0104 J9 CHEM PHYS JI Chem. Phys. PD JUN 1 PY 1991 VL 153 IS 3 BP 415 EP 426 DI 10.1016/0301-0104(91)80055-M PG 12 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA FR914 UT WOS:A1991FR91400009 ER PT J AU HERMILLER, JB MEHEGAN, JP NADKARNI, VM PASCHALL, JA NEVOLA, JJ FLETCHER, MA WILLIAMS, TJ AF HERMILLER, JB MEHEGAN, JP NADKARNI, VM PASCHALL, JA NEVOLA, JJ FLETCHER, MA WILLIAMS, TJ TI AMRINONE DURING PORCINE INTRAPERITONEAL SEPSIS SO CIRCULATORY SHOCK LA English DT Article DE SHOCK; CARDIOVASCULAR SHOCK; SWINE ID CONGESTIVE HEART-FAILURE; METABOLISM; SHOCK; HEMODYNAMICS; THERAPY AB Seven Yucatan minipigs with chronic, severe intraperitoneal sepsis were given amrinone i.v. (loading dose of 0.75 mg/kg, followed by continuous infusion of 10, 20, 40, and 80-mu-g/kg/min) during the hyperdynamic phase of sepsis. Hemodynamic variables and oxygen utilization, delivery, and extraction were recorded throughout the study. Pulmonary capillary wedge pressure was kept constant to ensure a fixed ventricular filling pressure. Intravenous amrinone modestly augmented cardiac index without altering heart rate. Mean systemic and pulmonary arterial pressures decreased. Systemic and pulmonary vascular resistance fell significantly (P < 0.05). Amrinone did not significantly alter oxygen utilization or oxygen extraction, although oxygen delivery increased (P < .05). During the hyperdynamic phase of sepsis in this animal model, amrinone elicits vasodilatation with a modest improvement in stroke volume index. Consequently, cardiac output and oxygen delivery increased modestly. Because of its vasodilating properties and small salutary effects, amrinone is not an optimal first-line medication for hemodynamic stabilization during hyperdynamic sepsis. C1 USN,MED RES INST,NATL CAPITAL REG,BETHESDA,MD 20814. NR 12 TC 9 Z9 9 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 1991 VL 34 IS 2 BP 247 EP 251 PG 5 WC Cardiac & Cardiovascular Systems SC Cardiovascular System & Cardiology GA FN824 UT WOS:A1991FN82400005 PM 1934325 ER PT J AU HOBAN, LD PASCHALL, JA ECKSTEIN, J REUSCH, D HERMILLER, J ROWE, B NEVOLA, JJ CARCILLO, JA AF HOBAN, LD PASCHALL, JA ECKSTEIN, J REUSCH, D HERMILLER, J ROWE, B NEVOLA, JJ CARCILLO, JA TI AWAKE PORCINE MODEL OF INTRAPERITONEAL SEPSIS AND ALTERED OXYGEN UTILIZATION SO CIRCULATORY SHOCK LA English DT Article DE PERITONITIS; HYPERDYNAMIC; HEMODYNAMICS; SHOCK; PATHOPHYSIOLOGY ID GRAM-NEGATIVE BACTEREMIA; SEQUENTIAL CARDIORESPIRATORY PATTERNS; SEPTIC SHOCK; CIRCULATORY MECHANISMS; CONSUMPTION; ENDOTOXIN; DELIVERY; HEMODYNAMICS; DYSFUNCTION; PERITONITIS AB We have characterized an awake swine model of septic shock. Hemodynamic, serum chemistry, and oxygen metabolism parameters were compared between eight septic and five sham animals. Eight male Yucatan miniature swine, weighing 20-28 kg, were anesthetized and catheters were placed in the pulmonary artery, external jugular, and the carotid artery. On day 2, 1.1-4.0 X 10(10) cfu Escherichia coli/kg were administered via an intraperitoneal catheter. Hemodynamic parameters were monitored hourly for 6 hours in awake animals. The animals were then placed back into the animal holding facility for clinical observation until the 24 hour post infusion measurements were taken. Septic animals were initially hypodynamic, with a decrease in cardiac index (CI) from a baseline value of 152.8 +/- 24.8 to 87.9 +/- 17.8 ml/kg/min (P < .05) and an increased systemic vascular resistance index (SVRI) from a control value of 48.1 +/- 9.5 to 65.0 +/- 16.7 dynes*sec*cm-5/kg. At 24 hours post infusion, the animals were hyperdynamic with the CI increased to 211.0 +/- 27.2 ml/kg/min (P < .05) and a decreased SVRI to 30.64 +/- 3.9 dynes*sec*cm-5/kg (P < .05). Oxygen utilization (VO2) increased during sepsis from 6.6 +/- 0.8 to 8.1 +/- 0.8 ml/kg/min at 6 hours (P < .05) and remained elevated at 24 hours at 7.7 +/- 0.4 (P < .05). Increased oxygen consumption was attained with an increase in oxygen extraction (O2 ext) from 0.34 +/- 0.03 to 0.56 +/- 0.07 (P < .05) during the first 6 hours of sepsis. At 24 hours, increased oxygen utilization was maintained by high oxygen delivery state. Significant alterations in serum chemistries in conjunction with post mortem evidence of multiple organ system failure were observed. Mortality on or before 4 days post infusion was 50% and positive blood cultures were obtained in 38% of the animals studied. This awake swine model serves as an excellent model to study metabolic pathophysiology and the treatment of septic shock. RP HOBAN, LD (reprint author), USN,MED RES INST,CASUALTY CARE RES DEPT,BETHESDA,MD 20814, USA. NR 37 TC 14 Z9 15 U1 0 U2 0 PU WILEY-LISS PI NEW YORK PA DIV JOHN WILEY & SONS INC 605 THIRD AVE, NEW YORK, NY 10158-0012 SN 0092-6213 J9 CIRC SHOCK JI Circ. Shock PD JUN PY 1991 VL 34 IS 2 BP 252 EP 262 PG 11 WC Cardiac & Cardiovascular Systems SC Cardiovascular System & Cardiology GA FN824 UT WOS:A1991FN82400006 PM 1934326 ER PT J AU SHARMA, J WILMOT, GB CAMPOLATTARO, AA SANTIAGO, F AF SHARMA, J WILMOT, GB CAMPOLATTARO, AA SANTIAGO, F TI XPS STUDY OF CONDENSED PHASE COMBUSTION IN DOUBLE-BASE ROCKET PROPELLANT WITH AND WITHOUT LEAD SALT BURNING RATE MODIFIER SO COMBUSTION AND FLAME LA English DT Article ID OXIDATION AB The condensed-phase combustion zones of double-base rocket propellants formulated with and without lead salt-burning modifiers have been investigated by using x-ray photoelectron spectroscopy (XPS). Combustion residues from samples extinguished at selected combustion pressures in the range of 4-12 MPa were investigated to a depth where all signs of reaction disappear. The quenched sample of the noncatalyzed propellant was altered to a depth of 10-12-mu-m only. It consisted of the original propellant and its combustion intermediates like nitrite and oxime. No soot formation was evident. In contrast to that, the samples of the catalyzed propellants quenched at different pressures were altered to the depth of 30-40-mu-m and a fluffy soot with a large concentration of lead in it was the principal constituent. The lead accumulation in the soot showed a maximum at a depth of about 10-mu-m below the surface and marked the region of highest catalytic activity. X-ray-stimulated electron spectroscopy revealed that lead was present both as metal and oxide and that more metallic lead was present in the samples from the super burning regime than those of the mesa regime. The Pb/C ratio in the soot, produced at different pressures, showed a sudden decrease coinciding with the onset of the mesa region. Thus the onset of the mesa regime can be ascribed to the loss of lead in the soot. The catalyzed propellant did not show the oxime-like reduced intermediate product, signifying that the presence of lead promotes thorough oxidation. The present work shows that modification of the combustion reaction in the catalyzed propellant begins in the condensed phase. RP SHARMA, J (reprint author), USN,CTR SURFACE WARFARE,SILVER SPRING,MD 20903, USA. NR 18 TC 6 Z9 10 U1 0 U2 4 PU ELSEVIER SCIENCE INC PI NEW YORK PA 655 AVENUE OF THE AMERICAS, NEW YORK, NY 10010 SN 0010-2180 J9 COMBUST FLAME JI Combust. Flame PD JUN PY 1991 VL 85 IS 3-4 BP 416 EP 426 DI 10.1016/0010-2180(91)90144-Z PG 11 WC Thermodynamics; Energy & Fuels; Engineering, Multidisciplinary; Engineering, Chemical; Engineering, Mechanical SC Thermodynamics; Energy & Fuels; Engineering GA FV210 UT WOS:A1991FV21000011 ER PT J AU JUNE, CH AF JUNE, CH TI SIGNAL TRANSDUCTION IN T-CELLS SO CURRENT OPINION IN IMMUNOLOGY LA English DT Article ID PHOSPHATIDYL-INOSITOL PATHWAY; ANTIGEN RECEPTOR; TYROSINE PHOSPHORYLATION; ACTIVATION; STIMULATION; CD28; KINASE; FC; HYDROLYSIS; SUBUNIT AB Rapid progress was made during the past year in the delineation of the nature of the initial biochemical events triggered by the T-cell antigen receptor. Antigen-mediated activation of phospholipase C was demonstrated to require protein tyrosine phosphorylation and, most surprising, activation of the Ras family of signal transduction molecules was shown to closely follow stimulation of the T-cell antigen receptor. Major controversy continues over which events are relevant to the various effector functions of T cells. C1 UNIFORMED SERV UNIV HLTH SCI,BETHESDA,MD 20814. RP JUNE, CH (reprint author), USN,MED RES INST,IMMUNE CELL BIOL PROGRAM,MAIL STOP 44,BETHESDA,MD 20889, USA. NR 39 TC 38 Z9 38 U1 0 U2 0 PU CURRENT BIOLOGY LTD PI LONDON PA 34-42 CLEVELAND STREET, LONDON, ENGLAND W1P 6LB SN 0952-7915 J9 CURR OPIN IMMUNOL JI Curr. Opin. Immunol. PD JUN PY 1991 VL 3 IS 3 BP 287 EP 293 DI 10.1016/0952-7915(91)90026-W PG 7 WC Immunology SC Immunology GA FV446 UT WOS:A1991FV44600002 PM 1832866 ER PT J AU JONES, TR DAVIS, MJ HOFFMAN, SL AF JONES, TR DAVIS, MJ HOFFMAN, SL TI IMMUNOLOGY, PATHOPHYSIOLOGY, AND TREATMENT OF MALARIA SO CURRENT OPINION IN INFECTIOUS DISEASES LA English DT Article AB In 1990, the World Health Organization estimated that more than 2 billion people live in areas where malaria transmission occurs, and that 270 million people develop new malaria infections each year. Malaria constitutes a threat not only to those living in endemic areas but to the millions of people who travel each year from malaria-free countries to zones of transmission. Most malaria research focuses on two of the four species of malaria, Plasmodium falciparum and Plasmodium vivax, with emphasis on the former. In this review, we examine some of the developments in malaria research during 1990, including vaccine development, the mechanisms by which the parasite causes disease, and current opinions on drug therapy, including new drugs and drug resistance. RP JONES, TR (reprint author), USN,MED RES INST,MALARIA PROGRAM,BETHESDA,MD 20889, USA. NR 0 TC 1 Z9 1 U1 0 U2 0 PU CURRENT SCIENCE PI PHILADELPHIA PA 400 MARKET STREET,SUITE 750 ATTN:SARAH WHEALEN/SUB MGR, PHILADELPHIA, PA 19106 SN 0951-7375 J9 CURR OPIN INFECT DIS JI Curr. Opin. Infect. Dis. PD JUN PY 1991 VL 4 IS 3 BP 265 EP 272 DI 10.1097/00001432-199106000-00002 PG 8 WC Infectious Diseases SC Infectious Diseases GA FT871 UT WOS:A1991FT87100002 ER PT J AU SOTTOS, NR SCOTT, WR MCCULLOUGH, RL AF SOTTOS, NR SCOTT, WR MCCULLOUGH, RL TI MICRO-INTERFEROMETRY FOR MEASUREMENT OF THERMAL DISPLACEMENTS AT FIBER MATRIX INTERFACES SO EXPERIMENTAL MECHANICS LA English DT Article AB A micro-interferometric technique for measuring out-of-plane thermal displacements on a scale commensurate with the dimensions of the fiber/matrix unit cell is described. A scanning micro-interferometer is used to image surface displacements of samples containing a single-pitch-based carbon fiber embedded in an epoxy matrix. The interferometer design gives the necessary resolution to detect small changes in thermal displacements in the fiber/matrix interface region. The samples were heated electrically through the fiber to create radially symmetric temperature and displacement fields. Repeatable displacement measurements were obtained on a radial line across the interface region with an accuracy of +/- 25 angstrom. A sharp expansion of the matrix surrounding the fiber was observed with each heating. Overall, the experiments demonstrate the utility of micro-interferometry for measuring submicron displacements. C1 USN,WARMINSTER,PA 18974. UNIV DELAWARE,DEPT CHEM ENGN,NEWARK,DE 19716. RP SOTTOS, NR (reprint author), UNIV ILLINOIS,216 TALBOT LAB,104 S WRIGHT ST,URBANA,IL 61801, USA. NR 9 TC 5 Z9 5 U1 0 U2 0 PU SOC EXPERIMENTAL MECHANICS PI BETHEL PA 7 SCHOOL STREET, BETHEL, CT 06801 SN 0014-4851 J9 EXP MECH JI Exp. Mech. PD JUN PY 1991 VL 31 IS 2 BP 98 EP 103 DI 10.1007/BF02327559 PG 6 WC Materials Science, Multidisciplinary; Mechanics; Materials Science, Characterization & Testing SC Materials Science; Mechanics GA FX638 UT WOS:A1991FX63800002 ER PT J AU CARPENTER, BW AF CARPENTER, BW TI LYMPHOMA OF THE APPENDIX SO GASTROINTESTINAL RADIOLOGY LA English DT Article DE APPENDIX, NEOPLASMS; APPENDICEAL LYMPHOMA, CT AND ULTRASOUND DIAGNOSIS ID PRIMARY MALIGNANT-LYMPHOMA; GASTROINTESTINAL-TRACT; DISEASE AB A rare case of appendiceal lymphoma in a patient who presented with lower gastrointestinal bleeding is reported. The findings on double-contrast barium enema, computed tomography (CT), and ultrasound are described and the clinical features of the few previously reported cases of appendiceal lymphoma are discussed. RP CARPENTER, BW (reprint author), USN HOSP,DEPT RADIOL,OAKLAND,CA 94627, USA. NR 10 TC 15 Z9 16 U1 1 U2 1 PU SPRINGER VERLAG PI NEW YORK PA 175 FIFTH AVE, NEW YORK, NY 10010 SN 0364-2356 J9 GASTROINTEST RADIOL PD SUM PY 1991 VL 16 IS 3 BP 256 EP 258 DI 10.1007/BF01887360 PG 3 WC Gastroenterology & Hepatology; Radiology, Nuclear Medicine & Medical Imaging SC Gastroenterology & Hepatology; Radiology, Nuclear Medicine & Medical Imaging GA FM658 UT WOS:A1991FM65800018 PM 1879646 ER PT J AU LEFORT, JP MAX, MD AF LEFORT, JP MAX, MD TI GULF-COAST EAST-COAST MAGNETIC ANOMALY .1. ROOT OF THE MAIN CRUSTAL DECOLLEMENT FOR THE APPALACHIAN-OUACHITA OROGEN - COMMENT SO GEOLOGY LA English DT Note C1 USN,RES LAB,WASHINGTON,DC 20375. RP LEFORT, JP (reprint author), UNIV RENNES 1,INST GEOL,TECTONOPHYS LAB,CAMPUS BEQULIEU,AVE GEN LECLERC,F-35042 RENNES,FRANCE. NR 13 TC 0 Z9 0 U1 0 U2 0 PU GEOLOGICAL SOC AMERICA PI BOULDER PA PO BOX 9140 3300 PENROSE PLACE, BOULDER, CO 80301 SN 0091-7613 J9 GEOLOGY JI Geology PD JUN PY 1991 VL 19 IS 6 BP 670 EP 670 DI 10.1130/0091-7613(1991)019<0670:CAROGC>2.3.CO;2 PG 1 WC Geology SC Geology GA FQ661 UT WOS:A1991FQ66100040 ER PT J AU FEDDER, JA MOBARRY, CM LYON, JG AF FEDDER, JA MOBARRY, CM LYON, JG TI RECONNECTION VOLTAGE AS A FUNCTION OF IMF CLOCK ANGLE SO GEOPHYSICAL RESEARCH LETTERS LA English DT Article ID INTERPLANETARY MAGNETIC-FIELD; SOLAR-WIND; EARTHS MAGNETOSPHERE; MAGNETOPAUSE RECONNECTION; GLOBAL SIMULATION; MHD SIMULATION; ENERGY; MODEL AB Magnetic reconnection between the interplanetary magnetic field (IMF) and the geomagnetic field is thought to play a major role in the transfer of solar wind momentum and energy to the magnetosphere. Both analytic modeling and analysis of geophysical data have shown that this coupling process should be a sensitive function of the clock angle of the IMF. In this letter we present results from a 3-dimensional, magnetohydrodynamic (MHD), global numerical simulation code for the reconnection voltage between the closed geomagnetic field and the IMF as a function of the IMF clock angle. These results are consistent with a sin(theta/2) functional behavior. C1 UNIV IOWA HOSP & CLIN,DEPT PHYS & ASTRON,IOWA CITY,IA 52242. RP FEDDER, JA (reprint author), USN,RES LAB,DIV PLASMA PHYS,SPACE PLASMA BRANCH,CODE 4782,WASHINGTON,DC 20375, USA. NR 29 TC 31 Z9 32 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 PY 1991 VL 18 IS 6 BP 1047 EP 1050 DI 10.1029/90GL02722 PG 4 WC Geosciences, Multidisciplinary SC Geology GA FR190 UT WOS:A1991FR19000016 ER PT J AU JACOBSON, RS SHAW, PR AF JACOBSON, RS SHAW, PR TI USING THE F-TEST FOR EIGENVALUE DECOMPOSITION PROBLEMS TO FIND THE STATISTICALLY OPTIMAL SOLUTION SO GEOPHYSICAL RESEARCH LETTERS LA English DT Article ID INVERSE-THEORY AB A fundamental problem using linear inverse theory to solve geophysical problems using eigenvalue decomposition algorithms is to determine how many eigenvalues to include in the solution. If very small eigenvalues are included, the solution variance increases rapidly, particularly if zero-values eigenvalues are computed as positive small numbers and are misidentified. F-tests can be applied to a succession of solutions, each containing an incremental number of eigenvalues, to determine statistical significance of the data variance reduction. This methodology is widely used for multiple variable regression analysis, but has not been applied to eigenvalue problems. The F-test is a statistical criterion for choosing an 'optimal' solution along the trade-off curve of model resolution and model variance for a particular model parameterization. C1 WOODS HOLE OCEANOG INST,DEPT GEOL & GEOPHYS,WOODS HOLE,MA 02543. RP JACOBSON, RS (reprint author), OFF NAVAL RES,ARLINGTON,VA 22217, USA. NR 11 TC 5 Z9 5 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 PY 1991 VL 18 IS 6 BP 1075 EP 1078 DI 10.1029/91GL01229 PG 4 WC Geosciences, Multidisciplinary SC Geology GA FR190 UT WOS:A1991FR19000023 ER PT J AU SALAS, E AF SALAS, E TI TRAINING THEORY, METHODS AND TECHNOLOGY - SPECIAL ISSUE PREFACE SO HUMAN FACTORS LA English DT Editorial Material RP SALAS, E (reprint author), USN,CTR TRAINING SYST,ORLANDO,FL 32826, USA. NR 3 TC 0 Z9 0 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 1991 VL 33 IS 3 BP 249 EP 250 PG 2 WC Behavioral Sciences; Engineering, Industrial; Ergonomics; Psychology, Applied; Psychology SC Behavioral Sciences; Engineering; Psychology GA GC425 UT WOS:A1991GC42500001 ER PT J AU CANNONBOWERS, JA TANNENBAUM, SI SALAS, E CONVERSE, SA AF CANNONBOWERS, JA TANNENBAUM, SI SALAS, E CONVERSE, SA TI TOWARD AN INTEGRATION OF TRAINING THEORY AND TECHNIQUE SO HUMAN FACTORS LA English DT Article ID MENTAL MODELS; CONTENT VALIDITY; KNOWLEDGE; ORGANIZATIONS; SYSTEMS; SEARCH AB Reviewers of the training literature have generally concluded that training theory and practice are not well integrated, and that research findings are not often translated into useful training methods. In an effort to bridge the gap between training theory and practice, an organizing framework for conceptualizing training research is presented. The purpose of the framework is to highlight the linkages between training-related theory and technique in the areas of training analysis, design, and evaluation. The linkages are described in detail, and illustrated via consideration of research into mental models. We hope that the framework will lead to future research programs that enhance the transition of training research from theory into practice, and integrate more fully these two perspectives. C1 N CAROLINA STATE UNIV,RALEIGH,NC 27695. SUNY ALBANY,ALBANY,NY 12222. RP CANNONBOWERS, JA (reprint author), USN,CTR TRAINING SYST,CODE 262,12350 RES PKWY,ORLANDO,FL 32826, USA. NR 101 TC 24 Z9 24 U1 1 U2 5 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 1991 VL 33 IS 3 BP 281 EP 292 PG 12 WC Behavioral Sciences; Engineering, Industrial; Ergonomics; Psychology, Applied; Psychology SC Behavioral Sciences; Engineering; Psychology GA GC425 UT WOS:A1991GC42500004 ER PT J AU MCDANIEL, WC RANKIN, WC AF MCDANIEL, WC RANKIN, WC TI DETERMINING FLIGHT TASK PROFICIENCY OF STUDENTS - A MATHEMATICAL DECISION AID SO HUMAN FACTORS LA English DT Article ID LINEAR-MODELS AB Accurate appraisal of student performance during and after training is important for the proper functioning of the training system and realization of training goals. Training systems-and particularly flight training programs-rely heavily on expert assessors' determination of student proficiency. Research is needed that will lead to improvements in the reliability and accuracy of these assessments. Recent research in decision making suggests that errors are frequently introduced because of the limited capabilities of people to integrate information and reach accurate conclusions. Mathematical decision aids appear to be helpful in reducing these errors. A decision aid using Wald's binomial probability ratio test and the sequential examination of student task performances was adapted to a training application. The decision aid required significantly less task trial information and predicted subsequent task performance more accurately than did expert assessors using the current assessment method. When students performed inconsistently and below the required flight task standards, instructors were more willing to declare proficiency than was the decision aid. This finding was especially apparent on the more difficult flight tasks. C1 USN,CTR TRAINING SYST,ORLANDO,FL. USN,CTR PERSONNEL RES & DEV,SAN DIEGO,CA 92132. NR 31 TC 1 Z9 1 U1 0 U2 0 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 1991 VL 33 IS 3 BP 293 EP 308 PG 16 WC Behavioral Sciences; Engineering, Industrial; Ergonomics; Psychology, Applied; Psychology SC Behavioral Sciences; Engineering; Psychology GA GC425 UT WOS:A1991GC42500005 ER PT J AU BULMER, CH BURNS, WK GREENBLATT, AS AF BULMER, CH BURNS, WK GREENBLATT, AS TI PHASE TUNING BY LASER ABLATION OF LINBO3 INTERFEROMETRIC MODULATORS TO OPTIMUM LINEARITY SO IEEE PHOTONICS TECHNOLOGY LETTERS LA English DT Article ID MACH-ZEHNDER INTERFEROMETER; DIRECTIONAL COUPLER; FILM AB Fast, accurate phase biase trimming of LiNbO3 interferometric modulators by excimer laser ablation is reported. Phase angle measurements and correction were performed in situ on a previously fabricated, packaged modulator. Any angle can be precisely adjusted to 90-degrees (maximum linearity). Single-laser-pulse exposures on one interferometer arm caused changes in angle of 0.8-8-degrees, depending on laser fluence and the depth of the material removed. RP BULMER, CH (reprint author), USN,RES LAB,CODE 6571,WASHINGTON,DC 20375, USA. NR 9 TC 14 Z9 14 U1 0 U2 0 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 1041-1135 J9 IEEE PHOTONIC TECH L JI IEEE Photonics Technol. Lett. PD JUN PY 1991 VL 3 IS 6 BP 510 EP 512 DI 10.1109/68.91017 PG 3 WC Engineering, Electrical & Electronic; Optics; Physics, Applied SC Engineering; Optics; Physics GA FZ281 UT WOS:A1991FZ28100007 ER PT J AU BILOW, HJ AF BILOW, HJ TI SCATTERING BY AN INFINITE WEDGE WITH TENSOR IMPEDANCE BOUNDARY-CONDITIONS - A MOMENT METHOD PHYSICAL OPTICS SOLUTION FOR THE CURRENTS SO IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION LA English DT Article ID HYBRID SOLUTIONS; REVOLUTION; BODIES AB Plane wave scattering by an infinite, two-dimensional wedge whose faces are characterized by impedance tensors is treated. A combination of the moment method (MM) and physical optics (PO) is used to obtain a solution for the equivalent electric currents; the equivalent magnetic currents are directly related to these electric currents by the impedance tensors. Sample results for wedges with isotropic and anisotropic face impedances are presented. RP BILOW, HJ (reprint author), USN,RES LAB,DIV RADAR,CODE 5316,WASHINGTON,DC 20375, USA. NR 14 TC 23 Z9 25 U1 0 U2 2 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0018-926X J9 IEEE T ANTENN PROPAG JI IEEE Trans. Antennas Propag. PD JUN PY 1991 VL 39 IS 6 BP 767 EP 773 DI 10.1109/8.86874 PG 7 WC Engineering, Electrical & Electronic; Telecommunications SC Engineering; Telecommunications GA FV222 UT WOS:A1991FV22200008 ER PT J AU JANASWAMY, R AF JANASWAMY, R TI ON THE APPLICABILITY OF OSRC METHOD TO HOMOGENEOUS SCATTERERS SO IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION LA English DT Note ID RADIATION AB The performance of the second-order radiation boundary condition of Kriegsmann and Morawetz in two-dimensional scattering by a homogeneous cylinder is investigated. The specific case of a circular cylinder of radius R(a) is considered. Approximate fields are obtained by imposing the radiation boundary condition on a conformal outer cylinder S(b) of radius R(b). Errors based on comparison of surface currents and complex scattered power are considered. Results are presented for a low frequency cylinder (R(a) = 2.5) and for a high frequency cylinder (R(a) = 10). It is shown that even for the simplest case of a circular cylinder, the on-surface radiation condition (OSRC) method does not always yield accurate results for the scattered fields for all values of material constants (epsilon-r, mu-r). Accurate results are achieved for some values of material constants, but highly erroneous results are produced for others. The accuracy of the surface radiation condition method is shown to be considerably improved by moving the outer surface S(b) sufficiently far from the object surface. Numerical results are presented for the transverse magnetic (TM) as well as the transverse electric (TE) polarizations. RP JANASWAMY, R (reprint author), USN,POSTGRAD SCH,DEPT ELECT & COMP ENGN,CODE EC JS,MONTEREY,CA 93943, USA. NR 7 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 0018-926X J9 IEEE T ANTENN PROPAG JI IEEE Trans. Antennas Propag. PD JUN PY 1991 VL 39 IS 6 BP 862 EP 867 DI 10.1109/8.86890 PG 6 WC Engineering, Electrical & Electronic; Telecommunications SC Engineering; Telecommunications GA FV222 UT WOS:A1991FV22200024 ER PT J AU CHOINSKI, TC TYLASKA, TT AF CHOINSKI, TC TYLASKA, TT TI GENERATION OF DIGIT REVERSED ADDRESS SEQUENCES FOR FAST FOURIER-TRANSFORMS SO IEEE TRANSACTIONS ON COMPUTERS LA English DT Note DE BIT REVERSAL; DIGIT REVERSAL; DIGITAL SIGNAL PROCESSOR; FAST FOURIER TRANSFORM (FFT); FFT PRESCRAMBLE; INTEGRATED CIRCUIT AB Digit reversed sequences for fast Fourier transforms (FFT) can be generated using firmware resident look-up tables, software algorithms, or application specific hardware. The integrated circuit described herein uses a digital circuit design approach to selectively generate digit reversed sequences for either radix-2, radix-4, or radix-2/4 fast Fourier transforms. RP CHOINSKI, TC (reprint author), USN,CTR UNDERWATER SYST,CODE 2151,NEW LONDON,CT 06320, USA. NR 7 TC 4 Z9 4 U1 2 U2 2 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 1991 VL 40 IS 6 BP 780 EP 784 DI 10.1109/12.90256 PG 5 WC Computer Science, Hardware & Architecture; Engineering, Electrical & Electronic SC Computer Science; Engineering GA FW969 UT WOS:A1991FW96900011 ER PT J AU TAIT, GB WESTGATE, CR AF TAIT, GB WESTGATE, CR TI ELECTRON-TRANSPORT IN RECTIFYING SEMICONDUCTOR ALLOY RAMP HETEROSTRUCTURES SO IEEE TRANSACTIONS ON ELECTRON DEVICES LA English DT Article ID SCHOTTKY-BARRIER DIODES; NUMERICAL-ANALYSIS; BOUNDARY-CONDITION; DEVICE SIMULATION; HETEROJUNCTIONS; GAAS; PERFORMANCE; INTERFACE; EQUATION AB The electron transport properties of AlGaAs ramp diodes are investigated using a physical model which combines current transport through the heterostructure bulk with current across the abrupt heterointerface in a fully self-consistent numerical approach. Transport at the abrupt material discontinuity is described by thermionic and thermionic-field emission processes, whereas transport in regions of smoothly varying alloy composition is modeled by diffusion-drift mechanisms. Several devices whose bandgaps are graded over several thousand angstroms have been fabricated by MBE and tested at room and liquid-nitrogen temperatures. The experimentally observed rectification properties are compared with the simulated results over a wide range of dc bias. Through appropriate choice of alloy composition and doping profiles, majority carrier devices based on internal (bulk) barriers may be realized. C1 USN,RES LAB,DIV ELECTR SCI & TECHNOL,WASHINGTON,DC 20375. RP TAIT, GB (reprint author), JOHNS HOPKINS UNIV,DEPT ELECT & COMP ENGN,BALTIMORE,MD 21218, USA. NR 29 TC 18 Z9 18 U1 0 U2 2 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0018-9383 J9 IEEE T ELECTRON DEV JI IEEE Trans. Electron Devices PD JUN PY 1991 VL 38 IS 6 BP 1262 EP 1270 DI 10.1109/16.81615 PG 9 WC Engineering, Electrical & Electronic; Physics, Applied SC Engineering; Physics GA FL269 UT WOS:A1991FL26900005 ER PT J AU FISCHER, RP HARGREAVES, TA FLIFLET, AW AF FISCHER, RP HARGREAVES, TA FLIFLET, AW TI COLD TESTS OF QUASI-OPTICAL GYROTRON RESONATORS SO IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES LA English DT Note AB Cold tests are performed on quasi-optical gyrotron resonators at frequencies near 94 and 120 GHz to measure cavity Q. The separation between the resonator mirrors is varied between 0.15 and 0.35 m, with measured quality factors ranging from 10 000 to 100 000. Good agreement is obtained between the measured data and values calculated from scalar diffraction theory. The effect of misaligning the mirrors is also examined experimentally. RP FISCHER, RP (reprint author), USN,RES LAB,DIV PLASMA PHYS,WASHINGTON,DC 20375, USA. NR 8 TC 1 Z9 1 U1 0 U2 4 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0018-9480 J9 IEEE T MICROW THEORY JI IEEE Trans. Microw. Theory Tech. PD JUN PY 1991 VL 39 IS 6 BP 1010 EP 1012 DI 10.1109/22.81671 PG 3 WC Engineering, Electrical & Electronic SC Engineering GA FL564 UT WOS:A1991FL56400015 ER PT J AU UHM, HS MILLER, JD SCHNEIDER, RF WEIDMAN, DJ AF UHM, HS MILLER, JD SCHNEIDER, RF WEIDMAN, DJ TI A MODEL FOR STEADY-STATE LARGE-VOLUME PLASMA GENERATION SO IEEE TRANSACTIONS ON PLASMA SCIENCE LA English DT Article ID FREQUENCY AB A simple, new scheme to generate a uniform, steady-state, large-volume plasma is presented. The weakly magnetized plasma is created by direct ionization of the background gas by low-energy electrons generated from thermionic filaments. An annular arrangement of the filaments ensures a uniform plasma density in the radial direction as predicted by theory. Experiments have been performed to characterize the plasma generated in such a configuration. In order to explain the experimental observation, we develop a bulk plasma theory based on plasma transport via cross-field diffusion. As assumed in the theoretical model, the experimental measurements indicate a uniform plasma density along the axis. Both the theory and experiment indicate that the plasma density is a function of the square of the external magnetic field. The theory also predicts the plasma density to be proportional to the neutral density to the two-thirds power in agreement with the experimental data. We also observe the experimental data to agree remarkably well with theoretical prediction for a broad range of system parameters. C1 ADV TECHNOL & RES INC,LAUREL,MD 20707. RP UHM, HS (reprint author), NAVAL SURFACE WARFARE CTR,DIRECTED ENERGY TECHNOL BRANCH,SILVER SPRING,MD 20903, USA. NR 14 TC 14 Z9 14 U1 0 U2 0 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0093-3813 J9 IEEE T PLASMA SCI JI IEEE Trans. Plasma Sci. PD JUN PY 1991 VL 19 IS 3 BP 535 EP 542 DI 10.1109/27.87235 PG 8 WC Physics, Fluids & Plasmas SC Physics GA FX319 UT WOS:A1991FX31900008 ER PT J AU DRIELS, MR PATHRE, US AF DRIELS, MR PATHRE, US TI VISION-BASED AUTOMATIC THEODOLITE FOR ROBOT CALIBRATION SO IEEE TRANSACTIONS ON ROBOTICS AND AUTOMATION LA English DT Article AB The vision-based automatic theodolite (VBAT) is an automatic partial-pose measurement system for robot calibration. It uses low-resolution rotation stages and resolution enhancement from a vision system to determine the line of sight to a spherical illuminated target. Automatic tracking, focusing, and centering provide the calibration system with speed, reliability, and repeatability. It is proposed that such a measurement prototype may be constructed without expensive precision machining, provided it is calibrated before use. Simulations are used to demonstrate that such a system may be identified using a hybrid approach: precalibration of the vision parameters, followed by calibration of the rotation stage parameters. All parameters are determined from measurements using a coordinate measuring machine. The parameter identification is formulated as a nonlinear regression problem, precluding the need for an explicit Jacobian relating the model parameters to the line-of-sight parameters. Verification of the VBAT calibration experiment showed that the identified model could predict the target position to a root mean square miss-distance of 0.2 mm. C1 DENEB ROBOT,TROY,MI 48098. RP DRIELS, MR (reprint author), USN,POSTGRAD SCH,DEPT MECH ENGN,MONTEREY,CA 93943, USA. NR 15 TC 21 Z9 22 U1 0 U2 3 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 1042-296X J9 IEEE T ROBOTIC AUTOM JI IEEE Trans. Robot. Autom. PD JUN PY 1991 VL 7 IS 3 BP 351 EP 360 DI 10.1109/70.88144 PG 10 WC Automation & Control Systems; Engineering, Electrical & Electronic; Robotics SC Automation & Control Systems; Engineering; Robotics GA FM295 UT WOS:A1991FM29500010 ER PT J AU BURKE, JM CZARNASKI, MA FISCHER, RP FLIFLET, AW MANHEIMER, WM AF BURKE, JM CZARNASKI, MA FISCHER, RP FLIFLET, AW MANHEIMER, WM TI DESIGN OF AN 85 GHZ TE1,3 PHASE-LOCKED GYROKLYSTRON OSCILLATOR EXPERIMENT SO INTERNATIONAL JOURNAL OF ELECTRONICS LA English DT Article ID GYROTRON; CAVITIES AB The design is described of an 85 GHz TE1,3 phase-locked gyrokylstron oscillator experiment. The purpose of the experiment is to study the physics issues associated with ultra-high power highly overmoded phase-locked gyroklystron oscillators. The problems of mode conversion losses at cavity boundaries and self-oscillation of the input cavity presented the most challenging aspect of the design. A WKB type theory of mode conversion losses in highly overmoded waveguide cavities had to be developed to quantify design trade-offs. Three input cavity designs with varying degrees of design risk with respect to mode conversion losses were fabricated and cold tested. Two cavities with conservative designs were found to perform very close to expectations. C1 JAYCOR INC,VIENNA,VA. USN,RES LAB,WASHINGTON,DC 20375. RP BURKE, JM (reprint author), BURKE TECHNOL INC,POB 1271,LA JOLLA,CA 92038, USA. NR 10 TC 0 Z9 0 U1 0 U2 0 PU TAYLOR & FRANCIS LTD PI LONDON PA ONE GUNDPOWDER SQUARE, LONDON, ENGLAND EC4A 3DE SN 0020-7217 J9 INT J ELECTRON JI Int. J. Electron. PD JUN PY 1991 VL 70 IS 6 BP 1109 EP 1130 DI 10.1080/00207219108921352 PG 22 WC Engineering, Electrical & Electronic SC Engineering GA FV551 UT WOS:A1991FV55100008 ER PT J AU LUQI AF LUQI TI THE ROLE OF PROTOTYPING LANGUAGES IN CASE SO INTERNATIONAL JOURNAL OF SOFTWARE ENGINEERING AND KNOWLEDGE ENGINEERING LA English DT Article AB Prototyping languages form a new category in the computer language family. They are different from the commonly familiar computer languages because they are used to support a higher level of automation at early phases of software development as well as throughout the entire process. They are used to create mechanically processable and executable descriptions or models of proposed software systems. Prototyping languages are also used to firm up requirements via frequent modifications and demonstrations of the models in an iterative process of prototype evolution. The benefits of a prototyping language are fully realized when it is used with its computer-aided prototyping system (CAPS). In this paper, we describe the background, requirements, characteristics, computational features, and general principles for the design of prototyping languages. An example of a prototyping language design is used to illustrate these concepts. C1 USN,POSTGRAD SCH,DEPT COMP SCI,MONTEREY,CA 93943. NR 30 TC 4 Z9 4 U1 0 U2 0 PU WORLD SCIENTIFIC PUBL CO PTE LTD PI SINGAPORE PA JOURNAL DEPT PO BOX 128 FARRER ROAD, SINGAPORE 9128, SINGAPORE SN 0218-1940 J9 INT J SOFTW ENG KNOW JI Int. J. Softw. Eng. Knowl. Eng. PD JUN PY 1991 VL 1 IS 2 BP 131 EP 149 DI 10.1142/S0218194091000135 PG 19 WC Computer Science, Artificial Intelligence; Computer Science, Software Engineering; Engineering, Electrical & Electronic SC Computer Science; Engineering GA FZ221 UT WOS:A1991FZ22100003 ER PT J AU BOGACZ, T AF BOGACZ, T TI WARTIME - UNDERSTANDING AND BEHAVIOR IN THE WORLD-WAR-2 - FUSSELL,P SO JOURNAL OF AMERICAN HISTORY LA English DT Book Review RP BOGACZ, T (reprint author), USN ACAD,ANNAPOLIS,MD 21402, USA. NR 1 TC 0 Z9 0 U1 0 U2 0 PU ORGAN AMER HISTORIANS PI BLOOMINGTON PA 112 N BRYAN ST, BLOOMINGTON, IN 47401 SN 0021-8723 J9 J AM HIST JI J. Am. Hist. PD JUN PY 1991 VL 78 IS 1 BP 378 EP 379 DI 10.2307/2078224 PG 2 WC History SC History GA FP543 UT WOS:A1991FP54300144 ER PT J AU ROSENBERG, DA AF ROSENBERG, DA TI RICKOVER AND THE NUCLEAR NAVY - THE DISCIPLINE OF TECHNOLOGY - DUNCAN,F SO JOURNAL OF AMERICAN HISTORY LA English DT Book Review RP ROSENBERG, DA (reprint author), USN,COLL WAR,NEWPORT,RI, USA. NR 1 TC 0 Z9 0 U1 0 U2 0 PU ORGAN AMER HISTORIANS PI BLOOMINGTON PA 112 N BRYAN ST, BLOOMINGTON, IN 47401 SN 0021-8723 J9 J AM HIST JI J. Am. Hist. PD JUN PY 1991 VL 78 IS 1 BP 394 EP 394 DI 10.2307/2078242 PG 1 WC History SC History GA FP543 UT WOS:A1991FP54300163 ER PT J AU RYAN, RL MALL, S AF RYAN, RL MALL, S TI RESPONSE OF SUBSURFACE RIGID STRIPS TO PLANE HARMONIC SHEAR-WAVES SO JOURNAL OF APPLIED MECHANICS-TRANSACTIONS OF THE ASME LA English DT Note C1 USN,RES LAB,DEPT NAVY,WASHINGTON,DC 20375. USAF,INST TECHNOL,WRIGHT PATTERSON AFB,OH 45433. NR 1 TC 0 Z9 2 U1 0 U2 0 PU ASME-AMER SOC MECHANICAL ENG PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 SN 0021-8936 J9 J APPL MECH-T ASME JI J. Appl. Mech.-Trans. ASME PD JUN PY 1991 VL 58 IS 2 BP 594 EP 596 DI 10.1115/1.2897232 PG 3 WC Mechanics SC Mechanics GA HP716 UT WOS:A1991HP71600047 ER PT J AU YOUNG, FC HINSHELWOOD, DD APRUZESE, JP DEENEY, C NASH, T PRASAD, RR AF YOUNG, FC HINSHELWOOD, DD APRUZESE, JP DEENEY, C NASH, T PRASAD, RR TI IMPLOSIONS OF NAF PLASMAS FOR PHOTOPUMPING A NA-NE X-RAY LASER SO JOURNAL OF APPLIED PHYSICS LA English DT Article ID Z-PINCHES; DISCHARGE; GAIN; IX AB Intense heliumlike sodium 11-angstrom line radiation is required to resonantly photopump a neon plasma in the Na-Ne soft x-ray laser scheme. The implosion of a NaF capillary-discharge plasma with a 3-MA peak current is used to produce a power exceeding 100 GW in this He-alpha line. The power is optimized by varying both the initial radius of the 3-cm-long NaF plasma column and the time delay between the capillary current and the generator current. Maximum power of 115 GW is obtained for implosions which occur just after peak current. Burn-through of the heliumlike sodium stage is evident in spectroscopic measurements where sodium Ly-alpha line emission is 2-4 times stronger than He-alpha emission. Mass loadings of 200-400-mu-g/cm are inferred from measured implosion times and initial plasma diameters. The nearly pure density dependence of the He-alpha power and the nearly pure temperature dependence of the Ly-alpha/He-alpha ratio allow the state of the plasma to be determined by measuring both quantities on a single shot. For these implosions, electron temperatures are 350-560 eV and total ion densities approach 10(20) cm-3. The mass load inferred from implosion dynamics is consistent with the ion density deduced from spectral measurements. C1 PHYS INT CO,SAN LEANDRO,CA 94577. RP YOUNG, FC (reprint author), USN,RES LAB,DIV PLASMA PHYS,WASHINGTON,DC 20375, USA. NR 28 TC 2 Z9 2 U1 0 U2 0 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0021-8979 J9 J APPL PHYS JI J. Appl. Phys. PD JUN 1 PY 1991 VL 69 IS 11 BP 7520 EP 7527 DI 10.1063/1.347569 PG 8 WC Physics, Applied SC Physics GA FP401 UT WOS:A1991FP40100019 ER PT J AU CHEN, CH FANG, ZM STRINGFELLOW, GB GEDRIDGE, RW AF CHEN, CH FANG, ZM STRINGFELLOW, GB GEDRIDGE, RW TI THE USE OF TRIISOPROPYLANTIMONY FOR THE GROWTH OF INSB AND GASB SO JOURNAL OF APPLIED PHYSICS LA English DT Article ID EPITAXIAL-GROWTH; PHASE EPITAXY; GAAS; PHOTOLUMINESCENCE; ALLOY AB A newly developed Sb source, triisopropylantimony (TIPSb), has been successfully used to grow InSb and GaSb epilayers by atmospheric pressure organometallic vapor phase epitaxy (OMVPE). Both GaSb and InSb have been grown with excellent morphologies. Growth efficiencies indicate that there are no parasitic reactions between TIPSb and trimethylgallium (TMGa) or trimethylindium. For GaSb growth, the temperatures have been varied between 500 and 600-degrees-C. V/III ratios close to unity are necessary to obtain the best morphologies at 600-degrees-C. As the growth temperature is decreased, lower V/III ratios are required. This is because TMGa decomposition is incomplete and TIPSb decomposes completely at these temperatures. The GaSb layers grown at 500-degrees-C have background hole concentrations of 2 X 10(16) cm-3. Low-temperature photoluminescence (PL) measurements indicate that the acceptor is due to Sb vacancies rather than carbon acceptors. A major advantage of TIPSb is that it decomposes at temperatures much lower than that for trimethylantimony (TMSb). InSb with good morphologies can be grown using V/III ratios close to unity at temperatures as low as 430-degrees-C. On the other hand, growth temperatures higher than 500-degrees-C are necessary for the growth of InSb using TMSb with V/ III ratios of close to 1. For temperatures lower than 430-degrees-C, InSb can be grown using TIPSb, but higher V/111 ratios are required due to incomplete TIPSb pyrolysis. The InSb epilayers have electron concentrations of about 5 X 10(16) cm-3 at 77 K and low-temperature PL shows well-resolved exciton and acceptor-related peaks. These results indicate that TIPSb is a viable source for the OMVPE growth of Sb-containing III-V semiconductors. C1 USN,CTR WEAP,RES DEPT,DIV CHEM,CHINA LAKE,CA 93555. RP CHEN, CH (reprint author), UNIV UTAH,DEPT MAT SCI & ENGN,SALT LAKE CITY,UT 84112, USA. NR 19 TC 20 Z9 20 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 JUN 1 PY 1991 VL 69 IS 11 BP 7605 EP 7611 DI 10.1063/1.348927 PG 7 WC Physics, Applied SC Physics GA FP401 UT WOS:A1991FP40100031 ER PT J AU RAO, MV HONG, WP CHANG, GK PAPANICOLAOU, N DIETRICH, HB AF RAO, MV HONG, WP CHANG, GK PAPANICOLAOU, N DIETRICH, HB TI LIGHT-ION BOMBARDED P-TYPE IN0.53GA0.47AS PHOTOCONDUCTIVE DETECTORS SO JOURNAL OF APPLIED PHYSICS LA English DT Article ID HIGH-SPEED AB The effect of H+ and B+ bombardment on the dark current and the impulse response speed of p-type InGaAs photoconductive detectors was studied. The dark current of the detectors decreased with light ion bombardment before the material turned n-type. The lowest dark current of H+ bombarded detectors was 10-mu-A at 6 V bias. The impulse response speed improved with H+ bombardment but did not change with B+ bombardment, as long as the material remained p-type. However the decay time of the detector response increased when the material turned n-type. The photoresponsivity in H+ bombarded detectors at 1.3-mu-m was 1 A/W, the bandwidth was 1.8 GHz, and the dark noise power into a 50-OMEGA-load was -110 dBm with a source-drain bias of 6 V. The test structures had 5-mu-m contact spacing. C1 BELLCORE,RED BANK,NJ 07701. USN,RES LAB,WASHINGTON,DC 20375. RP RAO, MV (reprint author), GEORGE MASON UNIV,DEPT ELECT & COMP ENGN,FAIRFAX,VA 22030, USA. NR 13 TC 0 Z9 0 U1 0 U2 0 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0021-8979 J9 J APPL PHYS JI J. Appl. Phys. PD JUN 1 PY 1991 VL 69 IS 11 BP 7881 EP 7886 DI 10.1063/1.347522 PG 6 WC Physics, Applied SC Physics GA FP401 UT WOS:A1991FP40100077 ER PT J AU SKUPNIEWICZ, CE DAVIDSON, KL AF SKUPNIEWICZ, CE DAVIDSON, KL TI HOT-FILM MEASUREMENTS FROM A SMALL BUOY - SURFACE WIND STRESS ESTIMATES USING THE INERTIAL DISSIPATION METHOD SO JOURNAL OF ATMOSPHERIC AND OCEANIC TECHNOLOGY LA English DT Article AB The design and deployment of an experimental meteorological buoy are described. A hot-film anemometer is used for in situ calculations of wind velocity variance spectra. The dissipation method is used to derive surface wind stress from the spectra. This is believed to be the first time a hot-film has been installed on a buoy and used to estimate surface wind stress. Buoy-based hot-film measurements provide distinct advantages over shipboard measurements in that they are much less subject to flow distortion by superstructure. The dissipation technique is also less subject to error due to uncertainties in stability-dependent physical mechanisms because the measurements are made very close to the water surface. Results are interpreted in terms of neutral drag coefficients, and simultaneous buoy and shipboard values show less scatter in the buoy data for a 40-h period. Given the variability in the wind speed and direction created by synoptic weather systems, both platforms compare satisfactorily with wind speed parameterizations of the neutral drag coefficient formulated by other investigators. The buoy hot-film data has an apparent wind speed limit of 11 m s-1 due to aerosol impaction. It is believed that this limit can be surpassed by using a sonic anemometer in place of the hot-film sensor. C1 USN,POSTGRAD SCH,DEPT NAVY,MONTEREY,CA 93943. NR 0 TC 10 Z9 10 U1 0 U2 0 PU AMER METEOROLOGICAL SOC PI BOSTON PA 45 BEACON ST, BOSTON, MA 02108-3693 SN 0739-0572 J9 J ATMOS OCEAN TECH JI J. Atmos. Ocean. Technol. PD JUN PY 1991 VL 8 IS 3 BP 309 EP 322 DI 10.1175/1520-0426(1991)008<0309:HFMFAS>2.0.CO;2 PG 14 WC Engineering, Ocean; Meteorology & Atmospheric Sciences SC Engineering; Meteorology & Atmospheric Sciences GA FQ925 UT WOS:A1991FQ92500001 ER PT J AU MOWREY, RC AF MOWREY, RC TI REACTIVE SCATTERING USING EFFICIENT TIME-DEPENDENT QUANTUM-MECHANICAL WAVE PACKET METHODS ON AN L-SHAPED GRID SO JOURNAL OF CHEMICAL PHYSICS LA English DT Article ID MOLECULE SURFACE SCATTERING; SCHRODINGER-EQUATION; DYNAMICS; DISSOCIATION; H-2; PROBABILITIES; CHEMISORPTION; COLLISION; NI(100); MODEL AB Most quantum mechanical time-dependent wave packet methods represent the wave packet on Cartesian grids. For reactive systems these grids can contain many points at which the wave function amplitude is negligible throughout the calculation. A significant fraction of the computational resources in a calculation may be used in calculating and storing values of the wave function at these grid points. This work describes a method which uses the Fourier transform method to calculate the kinetic energy of a wave function on a grid which covers only reactant and product regions of the potential. For a two-dimensional system this corresponds to the use of an L-shaped grid. The time propagation is performed using the Chebyshev propagation method. The method is demonstrated for a model problem treating dissociative adsorption and associative desorption of H2 from a flat surface. The amount of computational resources required for these calculations is much less than would be needed if the full rectangular grid was used. RP MOWREY, RC (reprint author), USN,RES LAB,THEORET CHEM SECT,CODE 6119,WASHINGTON,DC 20375, USA. NR 26 TC 67 Z9 67 U1 0 U2 3 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0021-9606 J9 J CHEM PHYS JI J. Chem. Phys. PD JUN 1 PY 1991 VL 94 IS 11 BP 7098 EP 7105 DI 10.1063/1.460243 PG 8 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA FL837 UT WOS:A1991FL83700016 ER PT J AU GORMAN, MR AF GORMAN, MR TI ACOUSTIC-EMISSION IN 2-D CARBON-CARBON COUPONS IN TENSION SO JOURNAL OF COMPOSITE MATERIALS LA English DT Article AB Carbon-carbon coupons were loaded and unloaded in uniaxial tension to progressively higher loads. Hysteresis in the material was noted especially after the stress-strain curves became nonlinear at about 2000-mu-epsilon. Each subsequent reloading showed an increase in the linear range similar to work hardening in metals except that the modulus was lower on each cycle. The onset of acoustic emission was monitored on each cycle and the computed felicity ratio correlated with the change in stiffness. C1 UNIV NEBRASKA,DEPT ENGN MECH,LINCOLN,NE 68588. RP GORMAN, MR (reprint author), USN,POSTGRAD SCH,DEPT AERONAUT & ASTRONAUT,MONTEREY,CA 93943, USA. NR 7 TC 9 Z9 9 U1 3 U2 4 PU TECHNOMIC PUBL CO INC PI LANCASTER PA 851 NEW HOLLAND AVE, BOX 3535, LANCASTER, PA 17604 SN 0021-9983 J9 J COMPOS MATER JI J. Compos Mater. PD JUN PY 1991 VL 25 IS 6 BP 703 EP 714 PG 12 WC Materials Science, Composites SC Materials Science GA FW743 UT WOS:A1991FW74300005 ER PT J AU PANISH, MB HAMM, RA RITTER, D LUFTMAN, HS COTELL, CM AF PANISH, MB HAMM, RA RITTER, D LUFTMAN, HS COTELL, CM TI REDISTRIBUTION OF BERYLLIUM IN INP AND GA0.47IN0.53AS GROWN BY HYDRIDE SOURCE MOLECULAR-BEAM EPITAXY AND METALORGANIC MOLECULAR-BEAM EPITAXY SO JOURNAL OF CRYSTAL GROWTH LA English DT Article ID GAS SOURCES; GAAS AB Heterostructures of Ga0.47In0.53As/InP were grown by hydride source and metalorganic molecular beam epitaxy with selected regions doped by means of an elemental beam of beryllium. Secondary ion mass spectrometry studies show that there is an upper Be flux, that increases with temperature, beyond which very rapid redistribution of the Be occurs, spreading the Be-doped region beyond that originally intended. The result is to limit the Be concentration that can be reached at a given temperature. This behavior is consistent with earlier Hall studies of very high Be doping in Ga0.47In0.53As that also show a maximum in the hole concentration that can be achieved at a given temperature. C1 USN,RES LAB,WASHINGTON,DC 20375. RP PANISH, MB (reprint author), AT&T BELL LABS,MURRAY HILL,NJ 07974, USA. NR 16 TC 25 Z9 25 U1 0 U2 3 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0022-0248 J9 J CRYST GROWTH JI J. Cryst. Growth PD JUN PY 1991 VL 112 IS 2-3 BP 343 EP 353 DI 10.1016/0022-0248(91)90309-S PG 11 WC Crystallography; Materials Science, Multidisciplinary; Physics, Applied SC Crystallography; Materials Science; Physics GA FV870 UT WOS:A1991FV87000004 ER PT J AU LI, SH LARSEN, CA STRINGFELLOW, GB GEDRIDGE, RW AF LI, SH LARSEN, CA STRINGFELLOW, GB GEDRIDGE, RW TI DECOMPOSITION STUDIES OF TRIISOPROPYLANTIMONY AND TRIALLYLANTIMONY SO JOURNAL OF ELECTRONIC MATERIALS LA English DT Article DE TRIISOPROPYLANTIMONY; TRIALLYLANTIMONY; PYROLYSIS; OMVPE ID PHASE EPITAXIAL-GROWTH; TRIMETHYLGALLIUM AB The pyrolysis of triisopropylantimony ((C3H7)3Sb) and triallylantimony ((C3H5)3Sb) has been investigated mass-spectrometrically in He and D2 using a SiO2 flow tube reactor at atmospheric pressure. Both temperature and time dependencies of percent decomposition were studied and the reaction products were analyzed. The overall decomposition processes for both compounds were found to be homogeneous and first order. (C3H7)3Sb pyrolyzes at 250-350-degrees-C with no effect of the ambient gas. However, C3H6, C3H8, and C6H14 (2,3-dimethylbutane) were produced in He whereas C3H7D appeared in D2. The pyrolysis is believed to begin via bond cleavage to generate the free C3H7 radicals that, in turn, recombine and disproportionate. Isopropyl radicals react slowly with D2, producing the C3H7D detected. For (C3H5)3Sb, the pyrolysis takes place at 100-160-degrees-C. The only major product is C6H10 (1,5-hexadiene). Both the pyrolysis rate and products were independent of the ambient. Two possible mechanisms, homolysis and reductive coupling, are discussed. Assuming that homolysis is the rate-limiting step for the pyrolysis of both (C3H7)3Sb and (C3H5)3Sb, bond strengths of 30.8 and 21.6 kcal/mole for C3H7-Sb and C3H5-Sb were determined from the experimental data. When either (C3H7)3Sb or (C3H5)3Sb was mixed with trimethylindium, a nonvolatile, liquid material, probably an adduct, was formed. C1 USN,CTR WEAP,DEPT RES,DIV CHEM,CHINA LAKE,CA 93555. RP LI, SH (reprint author), UNIV UTAH,DEPT MAT SCI & ENGN,SALT LAKE CITY,UT 84112, USA. NR 32 TC 21 Z9 21 U1 0 U2 0 PU MINERALS METALS MATERIALS SOC PI WARRENDALE PA 420 COMMONWEALTH DR, WARRENDALE, PA 15086 SN 0361-5235 J9 J ELECTRON MATER JI J. Electron. Mater. PD JUN PY 1991 VL 20 IS 6 BP 457 EP 463 DI 10.1007/BF02657826 PG 7 WC Engineering, Electrical & Electronic; Materials Science, Multidisciplinary; Physics, Applied SC Engineering; Materials Science; Physics GA FQ227 UT WOS:A1991FQ22700009 ER PT J AU MCCORMICK, ME AF MCCORMICK, ME TI A THEORETICAL-ANALYSIS OF A SELF-PROPELLED BACKWARD-BENT DUCT WAVE ENERGY-CONVERSION SYSTEM SO JOURNAL OF ENERGY RESOURCES TECHNOLOGY-TRANSACTIONS OF THE ASME LA English DT Article AB An analysis of a self-propelled Backward-Bent Duct Barge (BBDB) wave energy conversion system operating at an averaged forward speed is presented. The energy required to propel the system is a parasitic energy of the wave energy conversion subsystem. The analysis includes a feedback between the internal water motions and the floating body dynamics. The performance of the BBDB operating in a design (head) sea is shown to be far superior to both a BBDB in a following sea and a fixed BBDB in a following sea. For this comparison, a 35.6-m long system having a 9.91-m beam and displacing 500 metric tons is studied. The system is also shown to have a positive drift in head seas. RP MCCORMICK, ME (reprint author), USN ACAD,ANNAPOLIS,MD 21401, USA. NR 0 TC 2 Z9 2 U1 0 U2 0 PU ASME-AMER SOC MECHANICAL ENG PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 SN 0195-0738 J9 J ENERG RESOUR-ASME JI J. Energy Resour. Technol.-Trans. ASME PD JUN PY 1991 VL 113 IS 2 BP 94 EP 100 DI 10.1115/1.2905793 PG 7 WC Energy & Fuels SC Energy & Fuels GA HP690 UT WOS:A1991HP69000006 ER PT J AU ROOD, EP AF ROOD, EP TI MECHANISMS OF CAVITATION INCEPTION - REVIEW SO JOURNAL OF FLUIDS ENGINEERING-TRANSACTIONS OF THE ASME LA English DT Article AB A review is made of progress in research during the period 1979-1989 on the fundamental physical mechanisms of hydrodynamic cavitation inception. During that decade identification of the physical phenomena has been made, and techniques have been developed to reproduce on laboratory scale selected forms of full scale cavitation inception. Understanding of the mechanisms remains shallow, and analytical/numerical prediction methods are nonexistent except for the restricted case of travelling bubble cavitation inception in a passive pressure field. The control of inception is seen to be related in part to control of the underlying viscous flow features. A growing body of experimental evidence points to microscale vortex cavitation as a primal inception event. C1 USN,OFF NAVAL RES,FLUID DYNAM PROGRAM,ARLINGTON,VA 22217. NR 67 TC 35 Z9 42 U1 3 U2 9 PU ASME-AMER SOC MECHANICAL ENG PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 SN 0098-2202 J9 J FLUID ENG-T ASME JI J. Fluids Eng.-Trans. ASME PD JUN PY 1991 VL 113 IS 2 BP 163 EP 175 DI 10.1115/1.2909476 PG 13 WC Engineering, Mechanical SC Engineering GA HP710 UT WOS:A1991HP71000001 ER PT J AU LEFEBVRE, PJ WHITE, FM AF LEFEBVRE, PJ WHITE, FM TI FURTHER EXPERIMENTS ON TRANSITION TO TURBULENCE IN CONSTANT-ACCELERATION PIPE-FLOW SO JOURNAL OF FLUIDS ENGINEERING-TRANSACTIONS OF THE ASME LA English DT Article AB A second series of experiments was conducted to extend and validate recently reported data by the present authors on transition to turbulence in pipe flows started from rest under constant acceleration. The test section diameter was increased from the 5 cm of the previous experiment to 9 cm for the present study. The low end of the acceleration range was also extended by an order of magnitude from 1.8 m/s2 down to 0.2 m/s2. The highest acceleration was 11.2 m/s2. Pipe Reynolds number at transition was observed to be as high as 1.1 x 10(6). The present results are shown to validate the previously suggested transition correlation parameters. An analysis based on an empirical equation for transition in convectively accelerated flows is extended and applied to the current experimental data. C1 USN,CTR UNDERWATER SYST,NEWPORT,RI 02841. UNIV RHODE ISL,KINGSTON,RI 02881. NR 7 TC 5 Z9 6 U1 0 U2 2 PU ASME-AMER SOC MECHANICAL ENG PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 SN 0098-2202 J9 J FLUID ENG-T ASME JI J. Fluids Eng.-Trans. ASME PD JUN PY 1991 VL 113 IS 2 BP 223 EP 227 DI 10.1115/1.2909484 PG 5 WC Engineering, Mechanical SC Engineering GA HP710 UT WOS:A1991HP71000009 ER PT J AU DERE, KP BARTOE, JDF BRUECKNER, GE EWING, J LUND, P AF DERE, KP BARTOE, JDF BRUECKNER, GE EWING, J LUND, P TI EXPLOSIVE EVENTS AND MAGNETIC RECONNECTION IN THE SOLAR ATMOSPHERE SO JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS LA English DT Article ID CORONAL BRIGHT POINTS; TRANSITION-ZONE; ACTIVE REGION; QUIET SUN; O-IV; FLUX; OSO-8; CANCELLATION; EVOLUTION; MOTIONS AB Explosive events are highly energetic, small-scale phenomena which are frequently detected throughout the quiet and active Sun. They are seen in profiles of spectral lines formed at transition zone temperatures as exceptionally Doppler-shifted features, typically at 100 km s-1 to the red and/or blue of the rest wavelength. Sufficient observational evidence has now been developed to demonstrate that some explosive events are associated with the emergence of new magnetic flux. In these cases it is likely that the acceleration of plasma is caused by the magnetic reconnection resulting from flux emergence. We take as a working hypothesis the proposal that all explosive events are the result of magnetic reconnection. Since explosive events tend to occur on the edges of high photospheric magnetic field regions, we identify them with reconnection that occurs during the cancellation of photospheric magnetic flux (Martin, 1984; Livi et al., 1985). The combined observational characteristics of photospheric flux cancellation and transition zone explosive events provide powerful diagnostic information concerning the nature of magnetic reconnection. Reconnection in the quiet solar atmosphere apparently proceeds in bursts at sites much smaller than the boundary between opposite polarity flux elements that are observed to cancel in magnetograph sequences. Equating the velocity of the expelled transition zone plasma with the Alfven speed yields magnetic field strengths of 20 G at the site of reconnection. The speed at which the reconnection proceeds is commensurate with the rapid rates predicted by Petschek (1964). C1 APPL RES CORP,WASHINGTON,DC. INERTIA SWITCH AEROSP INC,WASHINGTON,DC. RP DERE, KP (reprint author), USN,RES LAB,EO HULBURT CTR SPACE RES,SOLAR PHYS BRANCH,CODE 4160,WASHINGTON,DC 20375, USA. NR 33 TC 134 Z9 137 U1 0 U2 1 PU AMER GEOPHYSICAL UNION PI WASHINGTON PA 2000 FLORIDA AVE NW, WASHINGTON, DC 20009 SN 0148-0227 J9 J GEOPHYS RES JI J. Geophys. Res-Space Phys. PD JUN 1 PY 1991 VL 96 IS A6 BP 9399 EP 9407 DI 10.1029/90JA02572 PG 9 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA FV651 UT WOS:A1991FV65100001 ER PT J AU KINTNER, PM SCALES, W VAGO, J YAU, A WHALEN, B ARNOLDY, R MOORE, T AF KINTNER, PM SCALES, W VAGO, J YAU, A WHALEN, B ARNOLDY, R MOORE, T TI HARMONIC H+ GYROFREQUENCY STRUCTURES IN AURORAL HISS OBSERVED BY HIGH-ALTITUDE AURORAL SOUNDING ROCKETS SO JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS LA English DT Article ID LOWER HYBRID WAVES; ELECTROSTATIC ION-CYCLOTRON; SUPRAURORAL REGION; BEAM INSTABILITIES; VIKING SATELLITE; PLASMA; ACCELERATION; ENVIRONMENT AB Two recent sounding rocket experiments have yielded VLF wave data with spectral structures ordered by the hydrogen gyrofrequency. The spectral structures occur near and above the lower hybrid frequency in association with auroral hiss. These structures are observed within and near regions of auroral electron precipitation and transverse ion acceleration. They are accompanied by auroral hiss but are anticorrelated with spectral peaks at the lower hybrid frequency. They are typically found above 500 km altitude, have no measurable magnetic component, and are at least occasionally short wavelength (k-rho-i-greater-than-or-equal-to 1). Because the spectral structures appear to be electrostatic, are ordered by the hydrogen gyrofrequency, and are short wavelength, we interpret the structures as modes which connect the lower hybrid mode with the hydrogen Bemstein modes. A study of the plasma wave mode structure in the vicinity of the lower hybrid frequency is presented to substantiate this interpretation. Our results imply that these waves are a common feature of the auroral zone ionosphere above 500 km altitude and exist any time that auroral hiss exists. The absence of previous satellite observations of this phenomenon can be explained by Doppler broadening. C1 USN,RES LAB,CODE 4780,WASHINGTON,DC 20375. UNIV NEW HAMPSHIRE,DEPT PHYS,DURHAM,NH 03824. NASA,GEORGE C MARSHALL SPACE FLIGHT CTR,SPACE SCI LAB,HUNTSVILLE,AL 35812. NATL RES COUNCIL CANADA,HERZBERG INST ASTROPHYS,OTTAWA K1A 0R6,ONTARIO,CANADA. RP KINTNER, PM (reprint author), CORNELL UNIV,SCH ELECT ENGN,ITHACA,NY 14853, USA. RI Moore, Thomas/D-4675-2012; Yau, Andrew/E-7007-2013 OI Moore, Thomas/0000-0002-3150-1137; Yau, Andrew/0000-0002-8210-0392 NR 32 TC 22 Z9 22 U1 0 U2 1 PU AMER GEOPHYSICAL UNION PI WASHINGTON PA 2000 FLORIDA AVE NW, WASHINGTON, DC 20009 SN 0148-0227 J9 J GEOPHYS RES JI J. Geophys. Res-Space Phys. PD JUN 1 PY 1991 VL 96 IS A6 BP 9627 EP 9638 DI 10.1029/91JA00563 PG 12 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA FV651 UT WOS:A1991FV65100019 ER PT J AU MELLOUK, S GREEN, SJ NACY, CA HOFFMAN, SL AF MELLOUK, S GREEN, SJ NACY, CA HOFFMAN, SL TI IFN-GAMMA INHIBITS DEVELOPMENT OF PLASMODIUM-BERGHEI EXOERYTHROCYTIC STAGES IN HEPATOCYTES BY AN L-ARGININE-DEPENDENT EFFECTOR MECHANISM SO JOURNAL OF IMMUNOLOGY LA English DT Article ID MACROPHAGE CYTO-TOXICITY; TUMOR NECROSIS FACTOR; T-CELLS RECOGNIZE; ACTIVATED MACROPHAGES; NITROGEN-OXIDES; CIRCUMSPOROZOITE PROTEIN; MALARIA SPOROZOITES; MURINE MACROPHAGES; INTERFERON-GAMMA; KUPFFER CELLS AB Primary cultures of BALB/cJ hepatocytes treated with 10(3) U/ml rIFN-gamma consistently inhibited intracellular Plasmodium berghei liver schizont development by 50 to 70%. Monomethyl-L-arginine (N(G)MMLA), the competitive inhibitor of L-arginine as substrate for production of nitric oxides by hepatocytes, reversed the activity of IFN-gamma on these malaria-infected cells. Reversal of IFN-gamma activity by N(G)MMLA was dose dependent and was maximal at 0.5 mM N(G)MMLA. Depletion of L-arginine by addition of arginase to the culture medium blocked the capacity of IFN-gamma to inhibit parasite development in hepatocytes; addition of excess L-arginine to cultures treated with IFN-gamma in the presence of N(G)MMLA competitively restored IFN-gamma capacity to activate hepatocyte anti-parasite activity. TNF-alpha was neither required for IFN-gamma activity, nor effective at any concentration tested as an inhibitor of schizont development by itself in primary hepatocytes. These data strongly suggest that the action of IFN-gamma on P. berghei-infected hepatocytes is to induce the production of L-arginine-derived nitrogen oxides that are toxic for the intracellular parasite. C1 USN,MED RES INST,MALARIA PROGRAM,BETHESDA,MD 20852. UNIV MARYLAND,SCH MED,CTR VACCINE DEV,DEPT MED,DIV GEOG MED,BALTIMORE,MD 21201. WALTER REED ARMY MED CTR,DEPT CELLULAR IMMUNOL,WASHINGTON,DC 20307. NR 39 TC 160 Z9 161 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 JUN 1 PY 1991 VL 146 IS 11 BP 3971 EP 3976 PG 6 WC Immunology SC Immunology GA FN054 UT WOS:A1991FN05400041 PM 1903415 ER PT J AU LEE, BA AF LEE, BA TI LESSONS FROM THE GREAT-DEPRESSION - TEMIN,P SO JOURNAL OF INTERDISCIPLINARY HISTORY LA English DT Book Review RP LEE, BA (reprint author), USN,COLL WAR,WASHINGTON,DC 20350, USA. NR 1 TC 0 Z9 0 U1 0 U2 0 PU MIT PRESS PI CAMBRIDGE PA 55 HAYWARD ST JOURNALS DEPT, CAMBRIDGE, MA 02142 SN 0022-1953 J9 J INTERDISCIPL HIST JI J. Interdiscip. Hist. PD SUM PY 1991 VL 22 IS 1 BP 146 EP 148 DI 10.2307/204595 PG 3 WC History SC History GA FX891 UT WOS:A1991FX89100037 ER PT J AU MARUYAMA, B OHUCHI, FS AF MARUYAMA, B OHUCHI, FS TI H2O CATALYSIS OF ALUMINUM CARBIDE FORMATION IN THE ALUMINUM-SILICON CARBIDE SYSTEM SO JOURNAL OF MATERIALS RESEARCH LA English DT Note ID INTERFACES; FILMS AB Aluminum carbide was found to form catalytically at aluminium-silicon carbide interfaces upon exposure to water vapor. Samples, composed of approximately 2 nm thick layers of Al on SiC, were fabricated and reacted in vacuo, and analyzed using XPS. Enhanced carbide formation was detected in samples exposed to 500 Langmuirs H2O and subsequently reacted for 600 s at 873 K. The cause of the catalysis phenomenon is hypothesized to be the weakening of silicon-carbon bonds caused by very strong bonding of oxygen atoms to the silicon carbide surface. Aluminum carbide formation is of interest because of its degrading effect on the mechanical properties of aluminum/silicone carbide reinforced metal matrix composites, as well as its effect on the electrical properties of aluminum metallizations on silicon carbide layers in microelectronic components. C1 DUPONT CO,CENT RES & DEV,WILMINGTON,DE 19880. RP MARUYAMA, B (reprint author), USN,RES LAB,CODE 6371,4555 OVERLOOK AVE,WASHINGTON,DC 20375, USA. NR 10 TC 11 Z9 11 U1 3 U2 8 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 1991 VL 6 IS 6 BP 1131 EP 1134 DI 10.1557/JMR.1991.1131 PG 4 WC Materials Science, Multidisciplinary SC Materials Science GA FQ052 UT WOS:A1991FQ05200002 ER PT J AU NGAI, KL AF NGAI, KL TI TEMPERATURE-DEPENDENCE OF THE STRETCHED EXPONENT IN STRUCTURAL RELAXATION OF FRAGILE GLASS-FORMING MOLECULAR LIQUIDS SO JOURNAL OF NON-CRYSTALLINE SOLIDS LA English DT Article; Proceedings Paper CT INTERNATIONAL DISCUSSION MEETING ON RELAXATION IN COMPLEX SYSTEMS CY JUN 18-29, 1990 CL CRETE, GREECE SP USN, OFF NAVAL RES, US DOE, MAX PLANCK INST POLYM RES, ELLENIC POLYM ASSOC, CHALMERS UNIV TECHNOL, EUROPEAN OFF AEROSP RES & DEV, AIR FORCE SCI RES, USA, R&D & STAND GRP, RHEOMETRICS, SUMITOMO PLAST AMER, HOECHST CELENESE RES DIV ID VOGEL-FULCHER BEHAVIOR; TRANSITION AB The Adam-Gibbs theory of structural relaxation in glass-forming liquids based on independent transitions of cooperative rearranging regions has been modified by Ngai, Rendell and Plazek to include possible interactions between them, using the coupling model. From this modified theory it has been shown that the structural relaxation function has the stretched exponential form. In this work, the possible temperature dependence of the stretch exponent, beta, is inferred and its trend deduced from the modified Adam-Gibbs theory. RP NGAI, KL (reprint author), USN,RES LAB,CODE 6807,WASHINGTON,DC 20375, USA. NR 12 TC 28 Z9 29 U1 0 U2 1 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 JUN PY 1991 VL 131 BP 80 EP 83 DI 10.1016/0022-3093(91)90277-D PN 1 PG 4 WC Materials Science, Ceramics; Materials Science, Multidisciplinary SC Materials Science GA FV574 UT WOS:A1991FV57400015 ER PT J AU NGAI, KL RENDELL, RW AF NGAI, KL RENDELL, RW TI TOWARD A THEORY OF RELAXATION IN CORRELATED SYSTEMS - DIFFUSION IN THE PHASE-SPACE OF A CHAOTIC HAMILTONIAN SO JOURNAL OF NON-CRYSTALLINE SOLIDS LA English DT Article; Proceedings Paper CT INTERNATIONAL DISCUSSION MEETING ON RELAXATION IN COMPLEX SYSTEMS CY JUN 18-29, 1990 CL CRETE, GREECE SP USN, OFF NAVAL RES, US DOE, MAX PLANCK INST POLYM RES, ELLENIC POLYM ASSOC, CHALMERS UNIV TECHNOL, EUROPEAN OFF AEROSP RES & DEV, AIR FORCE SCI RES, USA, R&D & STAND GRP, RHEOMETRICS, SUMITOMO PLAST AMER, HOECHST CELENESE RES DIV AB Relaxation in correlated system such as interacting ions, entangled polymer chains or viscous liquids requires a time-dependent relaxation rate for a full accounting of the observed phenomena. This has been demonstrated by the coupling scheme for relaxation in correlated systems. A fundamental theory of these systems necessarily involves non-integrable interactions or constraints which are known to produce chaos in Hamiltonian models. Van Kampen has shown that the transition rates in the master equation for a relaxing Hamiltonian system can be interpreted in terms of diffusion in phase space. In this paper, this approach is generalized to include chaotic Hamiltonians. It is demonstrated that general results from anomalous diffusion in fractals produce all the properties of the time-dependent relaxation rate required to explain the experiments. This leads to a conjecture on the non-Euclidean and possibly fractal phase space structure of relaxing chaotic Hamiltonians which would allow a basic understanding of the central results of the coupling scheme. RP NGAI, KL (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 15 TC 56 Z9 56 U1 0 U2 1 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 JUN PY 1991 VL 131 BP 233 EP 237 DI 10.1016/0022-3093(91)90308-S PN 1 PG 5 WC Materials Science, Ceramics; Materials Science, Multidisciplinary SC Materials Science GA FV574 UT WOS:A1991FV57400046 ER PT J AU RAJAGOPAL, AK NGAI, KL TEITLER, S AF RAJAGOPAL, AK NGAI, KL TEITLER, S TI THEORETICAL ASPECTS OF COUPLING MODEL SCHEMES OF SLOW RELAXATION IN COMPLEX CORRELATED SYSTEMS SO JOURNAL OF NON-CRYSTALLINE SOLIDS LA English DT Article; Proceedings Paper CT INTERNATIONAL DISCUSSION MEETING ON RELAXATION IN COMPLEX SYSTEMS CY JUN 18-29, 1990 CL CRETE, GREECE SP USN, OFF NAVAL RES, US DOE, MAX PLANCK INST POLYM RES, ELLENIC POLYM ASSOC, CHALMERS UNIV TECHNOL, EUROPEAN OFF AEROSP RES & DEV, AIR FORCE SCI RES, USA, R&D & STAND GRP, RHEOMETRICS, SUMITOMO PLAST AMER, HOECHST CELENESE RES DIV ID DYNAMICS; SIMULATION; DIFFUSION AB Experimental data of temporal relaxation phenomena in diverse types of complex correlated condensed matter systems seem to follow stretched exponential behavior (or its frequency space counterpart). Descriptions of such phenomena based on 'coupling model' schemes invoke three timescales: tau-0 associated with an early linear exponential; tau* associated with a late stretched exponential with a stretching index n (0 less-than-or-equal-to n < 1); and omega-c-1, the time of onset of the effect of coupling (correlation) which enters into a relation between tau-0 and tau*, namely, omega-c-tau* = [(1 - n)-omega-c-tau-0]1/1 - n. Tau-0 represents the relaxation time before correlations become operative and tau* is the relaxation time when correlations are operative. 'Coupling model' schemes described here have been successful in bringing together a large body of experimental data for a significant class of complex correlated systems (CCS) and demonstrate certain widely shared behaviors. A review of the conceptual notions used in coupling model schemes in the past decade is outlined. The scope and underlying assumptions of these schemes are made explicit. In an appendix, a general phenomenology that brings out the dynamic structure of relaxation in CCS is also outlined. RP RAJAGOPAL, AK (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 23 TC 40 Z9 40 U1 0 U2 0 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 JUN PY 1991 VL 131 BP 282 EP 288 DI 10.1016/0022-3093(91)90317-Y PN 1 PG 7 WC Materials Science, Ceramics; Materials Science, Multidisciplinary SC Materials Science GA FV574 UT WOS:A1991FV57400055 ER PT J AU RENDELL, RW NGAI, KL PLAZEK, DJ AF RENDELL, RW NGAI, KL PLAZEK, DJ TI VOLUME-DEPENDENT RATE-PROCESSES PREDICTED BY THE COUPLING MODEL SO JOURNAL OF NON-CRYSTALLINE SOLIDS LA English DT Article; Proceedings Paper CT INTERNATIONAL DISCUSSION MEETING ON RELAXATION IN COMPLEX SYSTEMS CY JUN 18-29, 1990 CL CRETE, GREECE SP USN, OFF NAVAL RES, US DOE, MAX PLANCK INST POLYM RES, ELLENIC POLYM ASSOC, CHALMERS UNIV TECHNOL, EUROPEAN OFF AEROSP RES & DEV, AIR FORCE SCI RES, USA, R&D & STAND GRP, RHEOMETRICS, SUMITOMO PLAST AMER, HOECHST CELENESE RES DIV ID ADAM-GIBBS FORMULATION; STRUCTURAL RELAXATION; POLYVINYL ACETATE); ENTHALPY RELAXATION; GLASSY-POLYMERS; PRIOR HISTORY; DIELECTRIC-RELAXATION; NONLINEARITY; RECOVERY AB Structural relaxations such as volume changes near T(g) are complicated by the fact that the approach to volume equilibrium is non-exponential in time and the rate of change of volume depends on the volume itself. The traditional approach for kinetic models of structural relaxations has been to generalize the observed linear response behavior, such as the Kohlrausch-Williams-Watts (KWW) decay function and Vogel-Fulcher-Tammann-Hesse (VFTH) temperature dependence, using a 'reduced time'. The reduced-time models have been successful in reproducing many experimentally observed phenomena. However this is worth re-examining for two reasons: (1) some phenomena, such as Kovacs' observation of the 'expansion gap' in tau-eff, cannot be reproduced even qualitatively by the reduced time method, and (2) there are observed linear response phenomena, in addition to KWW and VFTH, which are incompatible with the reduced-time models. In this paper, the coupling model approach based on a time-dependent rate due to intermolecular coupling is discussed. The coupling model quantitatively reproduces Kovacs' expansion gap and includes the additional observed phenomena in the limit of linear response. The coupling and reduced-time approaches are compared and experiments, including recent measurements of Bero and Plazek on specific volume at constant but very slow rates of cooling which find that the glassy line is attained at the same temperature for all cooling rates, are discussed. C1 UNIV PITTSBURGH,DEPT MAT SCI & ENGN,PITTSBURGH,PA 15261. RP RENDELL, RW (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 25 TC 10 Z9 10 U1 0 U2 3 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 JUN PY 1991 VL 131 BP 442 EP 450 DI 10.1016/0022-3093(91)90337-6 PN 1 PG 9 WC Materials Science, Ceramics; Materials Science, Multidisciplinary SC Materials Science GA FV574 UT WOS:A1991FV57400075 ER PT J AU FYTAS, G NGAI, KL AF FYTAS, G NGAI, KL TI EVIDENCE OF MODIFICATION OF SOLVENT REORIENTATION DYNAMICS FROM DEPOLARIZED RAYLEIGH SPECTRA OF POLYMER IN AROCLOR SOLUTIONS SO JOURNAL OF NON-CRYSTALLINE SOLIDS LA English DT Article; Proceedings Paper CT INTERNATIONAL DISCUSSION MEETING ON RELAXATIONS IN COMPLEX SYSTEMS CY JUN 18-29, 1990 CL CRETE, GREECE ID STRETCHED-EXPONENTIAL RELAXATION; VOGEL-FULCHER BEHAVIOR; GLASS-TRANSITION; LIGHT-SCATTERING; ANISOTROPY AB Depolarized Rayleigh spectra of neat Aroclor and Aroclor solutions of polystyrene and 1,4-polybutadiene obtained experimentally provide clear evidence of modification of the dynamics of orientational motion of the solvent by the dissolved polymer. The modification of the dynamics was monitored in a time window of nine decades. The experimental data can be explained by a modified Adam-Gibbs theory in which coupling between the cooperative rearranging regions has been incorporated. C1 USN,RES LAB,WASHINGTON,DC 20375. RP FYTAS, G (reprint author), FDN RES & TECHNOL,POB 1527,GR-71110 HERAKLION,GREECE. NR 24 TC 1 Z9 1 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0022-3093 J9 J NON-CRYST SOLIDS JI J. Non-Cryst. Solids PD JUN PY 1991 VL 131 BP 544 EP 550 DI 10.1016/0022-3093(91)90646-N PN 2 PG 7 WC Materials Science, Ceramics; Materials Science, Multidisciplinary SC Materials Science GA FV576 UT WOS:A1991FV57600002 ER PT J AU RENDELL, RW NGAI, KL AF RENDELL, RW NGAI, KL TI CONVOLUTION INTEGRAL FORMULATION OF DISPERSIVE DIFFUSION TRANSPORT - NUMERICAL-SOLUTIONS FOR THE COUPLING MODEL WAITING TIME DISTRIBUTION SO JOURNAL OF NON-CRYSTALLINE SOLIDS LA English DT Article; Proceedings Paper CT INTERNATIONAL DISCUSSION MEETING ON RELAXATIONS IN COMPLEX SYSTEMS CY JUN 18-29, 1990 CL CRETE, GREECE ID SIMULATION; DYNAMICS; SYSTEMS AB Diffusive transport of a species in a correlated system such as entangled polymer chains or Coulombically interacting ions can be formulated as a continuous-time random walk. The physics of the correlations are determined by the waiting-time distribution. Many features of relaxation and transport in correlated systems have been successfully described by the coupling model. Previous work had used solutions in the short-time and asymptotically long-time regimes to show that a waiting-time distribution derived from the coupling model predicts a mean-square displacement which crosses over from a power-law in time to a long-time linear dependence. In the present work, it is demonstrated that convolution integrals can be derived directly for averaged quantities in dispersive diffusion transport which can then be solved for all times by direct numerical methods. Numerical solutions using the coupling model distribution show that the previous analytical solutions for the crossover behavior in the mean-square displacement are valid except for a narrow transition zone. The results also agree with Monte Carlo and molecular dynamics simulations from other workers on self-diffusion of entangled polymer chains and on ion diffusion with Coulomb interactions. RP RENDELL, RW (reprint author), USN,RES LAB,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 0022-3093 J9 J NON-CRYST SOLIDS JI J. Non-Cryst. Solids PD JUN PY 1991 VL 131 BP 667 EP 670 DI 10.1016/0022-3093(91)90665-S PN 2 PG 4 WC Materials Science, Ceramics; Materials Science, Multidisciplinary SC Materials Science GA FV576 UT WOS:A1991FV57600021 ER PT J AU YU, H BINDER, K SCHWEIZER, K MCKENNA, G MUTHUKUMAR, M SILLESCU, H DONTH, EJ STRUIK, L LODGE, TP PHILLIES, G OSAKI, K RICHTER, D BERRY, G ADAM, M FELCHER, G NGAI, K OKONSKI, C HILFER, R GREST, G DYMEK, C WANG, CH AF YU, H BINDER, K SCHWEIZER, K MCKENNA, G MUTHUKUMAR, M SILLESCU, H DONTH, EJ STRUIK, L LODGE, TP PHILLIES, G OSAKI, K RICHTER, D BERRY, G ADAM, M FELCHER, G NGAI, K OKONSKI, C HILFER, R GREST, G DYMEK, C WANG, CH TI POLYMER DIFFUSION, DYNAMICS AND VISCOELASTICITY - DISCUSSION SO JOURNAL OF NON-CRYSTALLINE SOLIDS LA English DT Discussion C1 UNIV MAINZ, INST PHYS, STAUDINGER WEG 7, W-6500 MAINZ, GERMANY. UNIV MINNESOTA, DEPT CHEM, MINNEAPOLIS, MN 55455 USA. USN, RES LAB, WASHINGTON, DC 20375 USA. WORCESTER POLYTECH INST, DEPT PHYS, WORCESTER, MA 01605 USA. SANDIA NATL LABS, ALBUQUERQUE, NM 87185 USA. UNIV MASSACHUSETTS, DEPT POLYMER SCI & ENGN, AMHERST, MA 01003 USA. FORSCHUNGSZENTRUM JULICH, INST FESTKORPERFORSCH, W-5170 JULICH 1, GERMANY. RI Phillies, George/E-8109-2011; Richter, Dieter/H-3701-2013 OI Richter, Dieter/0000-0003-0719-8470 NR 6 TC 2 Z9 2 U1 0 U2 2 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0022-3093 EI 1873-4812 J9 J NON-CRYST SOLIDS JI J. Non-Cryst. Solids PD JUN PY 1991 VL 131 BP 742 EP 754 PN 2 PG 13 WC Materials Science, Ceramics; Materials Science, Multidisciplinary SC Materials Science GA FV576 UT WOS:A1991FV57600033 ER PT J AU WANG, CH LI, BY RENDELL, RW NGAI, KL AF WANG, CH LI, BY RENDELL, RW NGAI, KL TI LOCALIZED SEGMENTAL MOTION AND BRILLOUIN-SCATTERING IN A POLYMER LIQUID SO JOURNAL OF NON-CRYSTALLINE SOLIDS LA English DT Article; Proceedings Paper CT INTERNATIONAL DISCUSSION MEETING ON RELAXATIONS IN COMPLEX SYSTEMS CY JUN 18-29, 1990 CL CRETE, GREECE ID DIELECTRIC-RELAXATION; FLUCTUATIONS AB Using polyethylene glycol as an example, it is shown that the relaxation of the longitudinal stress modulus manifest in Brillouin scattering is associated with localized conformational dynamics involving only transitions of few chain segments from one isomeric state to another. Both the Debye and the Hall-Helfand models are adequate to the description of the dispersion and attenuation of the hypersonic wave in PEG. The Hall-Helfand model is more theoretically satisfactory than the Debye model, since it does not involve an artificially added term for the Brillouin linewidth. C1 USN,RES LAB,WASHINGTON,DC 20375. UNIV UTAH,SALT LAKE CITY,UT 84112. ACAD SCI CHANGCHUN,CHANGCHUN APPL CHEM INST,CHANGCHUN,PEOPLES R CHINA. RP WANG, CH (reprint author), UNIV NEBRASKA,DEPT CHEM,LINCOLN,NE 68588, USA. NR 18 TC 18 Z9 18 U1 0 U2 0 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 JUN PY 1991 VL 131 BP 870 EP 876 DI 10.1016/0022-3093(91)90694-2 PN 2 PG 7 WC Materials Science, Ceramics; Materials Science, Multidisciplinary SC Materials Science GA FV576 UT WOS:A1991FV57600050 ER PT J AU CAPPS, RN BURNS, J AF CAPPS, RN BURNS, J TI COMPARISON OF VISCOELASTIC AND DIELECTRIC RELAXATIONS AS A FUNCTION OF CARBON-BLACK LOADING IN BUTYL AND CHLOROBUTYL RUBBER SO JOURNAL OF NON-CRYSTALLINE SOLIDS LA English DT Article; Proceedings Paper CT INTERNATIONAL DISCUSSION MEETING ON RELAXATIONS IN COMPLEX SYSTEMS CY JUN 18-29, 1990 CL CRETE, GREECE AB Dynamic mechanical and dielectric spectra have been measured for a number of the simpler amorphous polymers such as acrylate compounds. Many complex polymer systems such as synthetic rubbers have not been as extensively studied. A transfer function technique and time-temperature superposition were used to measure the frequency-dependent Young's modulus and loss tangent as a function of carbon black loading and type in chemically cross-linked butyl and chlorobutyl rubbers. Dielectric permittivity and loss were measured as functions of frequency and temperature. The dielectric behavior was significantly influenced by the type of cross-linking system and by filler loading. The Williams-Watts 'stretched exponential' function was found to be a reasonable fit to the dielectric spectra of the unfilled systems. The effects of molecular motions and rubber-filler interactions on the two types of relaxations are discussed. C1 FLORIDA INST TECHNOL,MELBOURNE,FL 32901. RP CAPPS, RN (reprint author), USN,RES LAB,ORLANDO,FL 32806, USA. NR 15 TC 6 Z9 6 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 JUN PY 1991 VL 131 BP 877 EP 882 DI 10.1016/0022-3093(91)90695-3 PN 2 PG 6 WC Materials Science, Ceramics; Materials Science, Multidisciplinary SC Materials Science GA FV576 UT WOS:A1991FV57600051 ER PT J AU HARTMANN, B LEE, GF AF HARTMANN, B LEE, GF TI DYNAMIC MECHANICAL RELAXATION IN SOME POLYURETHANES SO JOURNAL OF NON-CRYSTALLINE SOLIDS LA English DT Article; Proceedings Paper CT INTERNATIONAL DISCUSSION MEETING ON RELAXATIONS IN COMPLEX SYSTEMS CY JUN 18-29, 1990 CL CRETE, GREECE AB Dynamic mechanical measurements of complex shear modulus versus frequency and temperature were made on a series of polyurethanes of varying soft-segment molecular weight. The time-temperature shifted data (master curves) mapped out the soft-segment glass transition. Shift factor curves were fitted to the Williams-Landel-Ferry (WLF) equation to obtain shift constants. The fractional free volume and coefficient of thermal expansion at the glass transition, determined from the shift constants, decrease as the molecular weight increases. Master curves were fitted to the modified Havriliak-Negami equation and the fitting parameters related to molecular structure. The limiting low-frequency modulus is dependent on the soft-segment molecular weight and percent crystallinity, but the limiting high-frequency modulus is about the same for all these polymers. The average relaxation time decreases with increasing soft-segment molecular weight and is correlated with glass transition temperature. RP HARTMANN, B (reprint author), USN,CTR SURFACE WARFARE,POLYMER PHYS GRP,SILVER SPRING,MD 20903, USA. NR 7 TC 11 Z9 11 U1 0 U2 1 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 JUN PY 1991 VL 131 BP 887 EP 890 DI 10.1016/0022-3093(91)90697-5 PN 2 PG 4 WC Materials Science, Ceramics; Materials Science, Multidisciplinary SC Materials Science GA FV576 UT WOS:A1991FV57600053 ER PT J AU NGAI, KL RENDELL, RW AF NGAI, KL RENDELL, RW TI FROM CONFORMATIONAL TRANSITIONS IN A POLYMER-CHAIN TO SEGMENTAL RELAXATION IN A BULK POLYMER SO JOURNAL OF NON-CRYSTALLINE SOLIDS LA English DT Article; Proceedings Paper CT INTERNATIONAL DISCUSSION MEETING ON RELAXATIONS IN COMPLEX SYSTEMS CY JUN 18-29, 1990 CL CRETE, GREECE ID TIME-CORRELATION FUNCTIONS; LINEAR AMORPHOUS POLYMERS; DYNAMIC LIGHT-SCATTERING; DIELECTRIC-RELAXATION; POLYVINYL ACETATE); GLASS-TRANSITION; TEMPERATURE-DEPENDENCE; TERMINAL DISPERSIONS; COUPLING MODEL; POLYISOPRENE AB The local segmental dynamics of a polymer chain are governed by the one-dimensional connectivity of the chain and are known to be well described by the Hall-Helfand model. In this paper, a theoretical model is developed which relates the local Hall-Helfand processes of a chain to the segmental motions in bulk polymers as revealed by mechanical, dielectric and light-scattering techniques. With the conformational transitions of each chain described by the Hall-Helfand correlation function, interactions between chains are included by the method of the coupling model. Previous applications of the coupling model had assumed a constant local rate and had obtained a Kohlrausch-Williams-Watts (KWW) decay function in the presence of intermolecular interactions. In the present work, the time-dependent Hall-Helfand rate is used as the local rate. The resulting decay function for bulk polymers generally differs from the KWW function but approaches it for times long compared with the Hall-Helfand correlated relaxation time, tau-1. The coupling model relation between the observed relaxation time and the local relaxation time is found to hold between the KWW relaxation time, tau*, and the Hall-Helfand uncorrelated relaxation time, tau-2. The decay functions for Hall-Helfand with coupling and the corresponding frequency loss response functions are presented and discussed. RP NGAI, KL (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 35 TC 63 Z9 63 U1 1 U2 3 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 JUN PY 1991 VL 131 BP 942 EP 948 DI 10.1016/0022-3093(91)90706-C PN 2 PG 7 WC Materials Science, Ceramics; Materials Science, Multidisciplinary SC Materials Science GA FV576 UT WOS:A1991FV57600062 ER PT J AU KANERT, O STEINERT, J JAIN, H NGAI, KL AF KANERT, O STEINERT, J JAIN, H NGAI, KL TI NUCLEAR-SPIN RELAXATION AND ATOMIC MOTION IN INORGANIC GLASSES SO JOURNAL OF NON-CRYSTALLINE SOLIDS LA English DT Article; Proceedings Paper CT INTERNATIONAL DISCUSSION MEETING ON RELAXATIONS IN COMPLEX SYSTEMS CY JUN 18-29, 1990 CL CRETE, GREECE ID LATTICE-RELAXATION; IONIC CONDUCTORS; ACTIVATION ENTHALPY; KOHLRAUSCH EXPONENT; MAGNETIC-RESONANCE; DEUTERON NMR; CONDUCTIVITY; TEMPERATURE; TRANSITION; DIFFUSION AB Results of temperature and frequency dependence of nuclear spin relaxation (NSR) are presented for different inorganic glasses between 0.4 K and the glass transition temperature. Below about 200 K, the data can be interpreted consistently in the framework of thermally activated low-frequency excitations of disordered modes. The modes are described by asymmetric double well potential (ADWP) configurations with suitable densities of states. Above about 200 K, the NSR is due to diffusive jumps of ions but deduction of corresponding transport properties (i.e. diffusion coefficients) from such data by means of standard NSR theories turns out to be difficult. Models are discussed which attempt to overcome these difficulties by relating the NSR with electrical conductivity. Further, deuterium NMR is shown to elucidate the motional mechanism of D2O molecules and dynamical properties of the glass transition in electrolyte glasses. C1 LEHIGH UNIV,BETHLEHEM,PA 18015. USN,RES LAB,WASHINGTON,DC 20375. RP KANERT, O (reprint author), UNIV DORTMUND,INST PHYS,W-4600 DORTMUND 50,GERMANY. NR 42 TC 35 Z9 35 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 JUN PY 1991 VL 131 BP 1001 EP 1010 DI 10.1016/0022-3093(91)90715-I PN 2 PG 10 WC Materials Science, Ceramics; Materials Science, Multidisciplinary SC Materials Science GA FV576 UT WOS:A1991FV57600071 ER PT J AU STROM, U NGAI, KL KANERT, O AF STROM, U NGAI, KL KANERT, O TI NATURE OF THE LINEAR FREQUENCY-DEPENDENT AC-CONDUCTIVITY IN GLASSY IONIC CONDUCTORS SO JOURNAL OF NON-CRYSTALLINE SOLIDS LA English DT Article; Proceedings Paper CT INTERNATIONAL DISCUSSION MEETING ON RELAXATIONS IN COMPLEX SYSTEMS CY JUN 18-29, 1990 CL CRETE, GREECE ID NA-BETA-ALUMINA; NUCLEAR-SPIN RELAXATION; LATTICE-RELAXATION; LOW-TEMPERATURES; DIELECTRIC LOSS; MICROWAVE; LOCALIZATION; VIBRATIONS; SCATTERING AB A very common observation for glassy ionic conductors is an ac conductivity which depends linearly on frequency. Another common feature of these glasses is an NMR spin-relaxation rate 1/T1 which has an approximately linear Larmor frequency and a slightly stronger than linear temperature dependence. It is proposed that these two properties are related and stem from a common physical mechanism. Information about the nature of this mechanism and the type of excitations involved in these processes can be gained from similar observations in non-glassy, but disordered ionic conductors, such as Na-beta-Alumina. C1 UNIV DORTMUND,DEPT PHYS,W-4600 DORTMUND 50,GERMANY. RP STROM, U (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 41 TC 29 Z9 29 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 JUN PY 1991 VL 131 BP 1011 EP 1017 DI 10.1016/0022-3093(91)90716-J PN 2 PG 7 WC Materials Science, Ceramics; Materials Science, Multidisciplinary SC Materials Science GA FV576 UT WOS:A1991FV57600072 ER PT J AU BUNDE, A INGRAM, MD MAASS, P NGAI, KL AF BUNDE, A INGRAM, MD MAASS, P NGAI, KL TI MIXED ALKALI EFFECTS IN IONIC CONDUCTORS - A NEW MODEL AND COMPUTER-SIMULATIONS SO JOURNAL OF NON-CRYSTALLINE SOLIDS LA English DT Article; Proceedings Paper CT INTERNATIONAL DISCUSSION MEETING ON RELAXATIONS IN COMPLEX SYSTEMS CY JUN 18-29, 1990 CL CRETE, GREECE ID ELECTRICAL-CONDUCTIVITY; SILICATE GLASSES AB A new model theory of the mixed alkali effect that is consistent with the most recent EXAFS data of cation environments in mixed alkali silicate glass is presented. The dynamics of ion transport and the memory effects of site occupancy are brought out by computer simulations based on the model in an infinite percolation cluster. The salient features of the mixed alkali effect in the diffusion coefficients of the two cations are reproduced in the results of computer simulations. C1 UNIV ABERDEEN,DEPT CHEM,ABERDEEN AB9 1FX,SCOTLAND. USN,RES LAB,WASHINGTON,DC 20375. RP BUNDE, A (reprint author), UNIV HAMBURG,INST THEORET PHYS 1,W-2000 HAMBURG 36,GERMANY. RI Maass, Philipp/H-1477-2011 NR 38 TC 88 Z9 88 U1 1 U2 5 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 JUN PY 1991 VL 131 BP 1109 EP 1112 DI 10.1016/0022-3093(91)90735-O PN 2 PG 4 WC Materials Science, Ceramics; Materials Science, Multidisciplinary SC Materials Science GA FV576 UT WOS:A1991FV57600091 ER PT J AU RISEN, W INGRAM, MD CHRYSSIKOS, G MENDIRATTA, SK STROM, U ANGELL, CA TSAI, TE DONTH, EJ BUNDE, A NGAI, KL MARTIN, S NITZAN, A MOYNIHAN, CT POLLAK, M BATES, J KREMER, F COLE, RH BERBERIAN, J KANERT, O HEITJANS, P JAIN, H AF RISEN, W INGRAM, MD CHRYSSIKOS, G MENDIRATTA, SK STROM, U ANGELL, CA TSAI, TE DONTH, EJ BUNDE, A NGAI, KL MARTIN, S NITZAN, A MOYNIHAN, CT POLLAK, M BATES, J KREMER, F COLE, RH BERBERIAN, J KANERT, O HEITJANS, P JAIN, H TI GLASSY IONICS - DISCUSSION SO JOURNAL OF NON-CRYSTALLINE SOLIDS LA English DT Discussion C1 UNIV ABERDEEN, DEPT CHEM, ABERDEEN AB9 2UE, SCOTLAND. NATL HELLENIC RES FDN, INST THEORET & PHYS CHEM, GR-11635 ATHENS, GREECE. UNIV AVEIRO, DEPT FIS, P-3800 AVEIRO, PORTUGAL. USN, RES LAB, WASHINGTON, DC 20375 USA. UNIV HAMBURG, INST THEORET PHYS 1, W-2000 HAMBURG 36, GERMANY. USN, RES LAB, WASHINGTON, DC 20375 USA. UNIV DORTMUND, DEPT PHYS, W-4600 DORTMUND 50, GERMANY. IOWA STATE UNIV SCI & TECHNOL, DEPT MAT SCI & ENGN, AMES, IA 50011 USA. OAK RIDGE NATL LAB, DIV SOLID STATE, OAK RIDGE, TN USA. WEIZMANN INST SCI, DEPT CHEM PHYS, IL-76100 REHOVOT, ISRAEL. LEHIGH UNIV, BETHLEHEM, PA 18015 USA. BROWN UNIV, DEPT CHEM, PROVIDENCE, RI 02906 USA. RI Universidade Aveiro, Departamento Fisica/E-4128-2013; Chryssikos, Georgios/L-6488-2013; Mendiratta, Sushil Kumar/K-4429-2013 OI Mendiratta, Sushil Kumar/0000-0002-0207-4244 NR 0 TC 0 Z9 0 U1 1 U2 4 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0022-3093 EI 1873-4812 J9 J NON-CRYST SOLIDS JI J. Non-Cryst. Solids PD JUN PY 1991 VL 131 BP 1113 EP 1122 PN 2 PG 10 WC Materials Science, Ceramics; Materials Science, Multidisciplinary SC Materials Science GA FV576 UT WOS:A1991FV57600092 ER PT J AU TSAI, TE PONG, R HIGBY, PL AF TSAI, TE PONG, R HIGBY, PL TI STRUCTURAL RELAXATION FOLLOWING CRYSTALLIZATION IN HIGH-PURITY GEO2 GLASS SO JOURNAL OF NON-CRYSTALLINE SOLIDS LA English DT Article; Proceedings Paper CT INTERNATIONAL DISCUSSION MEETING ON RELAXATIONS IN COMPLEX SYSTEMS CY JUN 18-29, 1990 CL CRETE, GREECE ID DEFECT CENTERS; FIBER AB Crystallization of high purity GeO2 glass heat treated for various lengths of time at temperatures between 373 and 1273 K was monitored by X-ray diffraction. Structural relaxation at and slightly above room temperature in these partially crystalline samples was studied by electron spin resonance (ESR) spectroscopy as a function of time. Broken bonds are created during the structural relaxation of the glassy phase as evidenced by the increase in the concentration of Ge E' centers. RP TSAI, TE (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 11 TC 1 Z9 1 U1 0 U2 1 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 JUN PY 1991 VL 131 BP 1218 EP 1223 DI 10.1016/0022-3093(91)90757-W PN 2 PG 6 WC Materials Science, Ceramics; Materials Science, Multidisciplinary SC Materials Science GA FV576 UT WOS:A1991FV57600113 ER PT J AU TSAI, TE GRISCOM, DL AF TSAI, TE GRISCOM, DL TI DISPERSIVE DIFFUSIVE TRANSPORT OF FREE-EXCITONS IN HIGH-PURITY SILICA SO JOURNAL OF NON-CRYSTALLINE SOLIDS LA English DT Article; Proceedings Paper CT INTERNATIONAL DISCUSSION MEETING ON RELAXATIONS IN COMPLEX SYSTEMS CY JUN 18-29, 1990 CL CRETE, GREECE ID KINETICS; SIO2 AB Si E' centers and oxygen hole centers (OHC) induced by pulsed ArF excimer laser irradiation in high purity silica are studied as a function of pulse repetition rates. It was found that the concentration of Si E' centers induced by a fixed photon fluence increases as the repetition rate approaches the decay rate of self-trapped excitons, while the production of OHC remains approximately the same. Dispersive diffusive transport of free excitons is inferred from a reported correlation of the growth of E' centers and OHC with increasing doses of high energy particles. C1 USN,RES LAB,WASHINGTON,DC 20375. NR 12 TC 10 Z9 10 U1 1 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 JUN PY 1991 VL 131 BP 1240 EP 1244 DI 10.1016/0022-3093(91)90762-U PN 2 PG 5 WC Materials Science, Ceramics; Materials Science, Multidisciplinary SC Materials Science GA FV576 UT WOS:A1991FV57600118 ER PT J AU NAGLI, KL WRIGHT, GB AF NAGLI, KL WRIGHT, GB TI PROCEEDINGS OF THE INTERNATIONAL DISCUSSION MEETING ON RELAXATIONS IN COMPLEX-SYSTEMS .1. HERAKLION, CRETE, GREECE, JUNE 18-29, 1990 - PREFACE SO JOURNAL OF NON-CRYSTALLINE SOLIDS LA English DT Editorial Material C1 OFF NAVAL RES,ARLINGTON,VA 22217. RP NAGLI, KL (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0022-3093 J9 J NON-CRYST SOLIDS JI J. Non-Cryst. Solids PD JUN PY 1991 VL 131 BP R7 EP R8 PN 1 PG 2 WC Materials Science, Ceramics; Materials Science, Multidisciplinary SC Materials Science GA FV574 UT WOS:A1991FV57400001 ER PT J AU DUTT, DA HIGBY, PL GRISCOM, DL AF DUTT, DA HIGBY, PL GRISCOM, DL TI AN ELECTRON-SPIN-RESONANCE STUDY OF X-IRRADIATED CALCIUM ALUMINOSILICATE GLASSES SO JOURNAL OF NON-CRYSTALLINE SOLIDS LA English DT Article ID FUNDAMENTAL DEFECT CENTERS; SI-29 HYPERFINE-STRUCTURE; ALUMINATE GLASSES; PARAMAGNETIC CENTERS; DOPANT-FREE; HOLE CENTER; SILICA; MECHANISM; CERAMICS; SYSTEM AB An electron spin resonance investigation of a series of low-silica-content (less-than-or-equal-to 20 mol%) calcium aluminosilicate glasses has been performed. The compositional dependence of the X-ray-induced defects is found to be consistent with the proposed dependence of the number of non-bridging oxygens on the CaO/Al2O3 ratio and the silica content. Computer lineshape simulations of the experimental data have led to the identification of two variations of aluminum-oxygen hole centers. RP DUTT, DA (reprint author), USN,RES LAB,OPT MAT RES GRP,WASHINGTON,DC 20375, USA. NR 39 TC 29 Z9 29 U1 2 U2 13 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 JUN PY 1991 VL 130 IS 1 BP 41 EP 51 DI 10.1016/0022-3093(91)90154-X PG 11 WC Materials Science, Ceramics; Materials Science, Multidisciplinary SC Materials Science GA FV837 UT WOS:A1991FV83700005 ER PT J AU WU, CT AF WU, CT TI OOP + VISUAL DATA-FLOW DIAGRAM = PROGRAPH SO JOURNAL OF OBJECT-ORIENTED PROGRAMMING LA English DT Article C1 NAVAL POST GRAD SCH,MONTEREY,CA. NR 2 TC 0 Z9 0 U1 0 U2 0 PU SIGS PUBLICATIONS INC PI NEW YORK PA 588 BROADWAY SUITE 604, NEW YORK, NY 10012-5408 SN 0896-8438 J9 J OBJECT-ORIENT PROG JI J. Object-Oriented Program. PD JUN PY 1991 VL 4 IS 3 BP 71 EP 75 PG 5 WC Computer Science, Software Engineering; Computer Science, Theory & Methods SC Computer Science GA FQ145 UT WOS:A1991FQ14500009 ER PT J AU SHANNON, KM MENTZER, WC ABELS, RI FREEMAN, P NEWTON, N THOMPSON, D SNIDERMAN, S BALLARD, R PHIBBS, RH AF SHANNON, KM MENTZER, WC ABELS, RI FREEMAN, P NEWTON, N THOMPSON, D SNIDERMAN, S BALLARD, R PHIBBS, RH TI RECOMBINANT-HUMAN-ERYTHROPOIETIN IN THE ANEMIA OF PREMATURITY - RESULTS OF A PLACEBO-CONTROLLED PILOT-STUDY SO JOURNAL OF PEDIATRICS LA English DT Article ID ERYTHROID PROGENITORS; IMMUNOREACTIVE ERYTHROPOIETIN; POSTNATAL CHANGES; INFANTS; MARROW AB Experimental and clinical data implicate inadequate erythropoietin production as an important reason that infants acquire this anemia and suggest that recombinant human erythropoietin (r-HuEPO) might be used to treat or prevent it. We therefore randomly assigned 20 small premature infants (birth weight less-than-or-equal-to 1250 gm) who were highly likely to require erythrocyte transfusions for anemia of prematurity to receive 6 weeks of treatment with either intravenously administered r-HuEPO (at a dose of 100 units/kg twice each week) or a placebo. Hematologic measurements, transfusion requirements, and growth were followed during therapy and for 6 months thereafter. Treated (EPO) and control babies did not differ with respect to weight, hematocrit, overall mean absolute reticulocyte count, calculated erythrocyte mass, or rate of growth. However, reticulocyte counts increased earlier in patients given r-HuEPO. Six of ten babies in the EPO group, and 8 of 10 assigned to the control group, received at least one erythrocyte transfusion during treatment. For all infants the amount of blood sampled for laboratory tests was strongly predictive of the volume of packed erythrocytes transfused (r = 0.890; p = 0.0001). Of nine infants who had < 20 ml packed erythrocytes removed for laboratory tests, none of four given r-HuEPO received a transfusion, whereas three of five infants assigned to the placebo group received one. No toxic effects were attributable to r-HuEPO, and no significant changes in leukocyte or platelet counts occurred during treatment. Reticulocyte counts were correlated with simultaneous platelet counts and were inversely related to absolute neutrophil counts in both study groups. We conclude that r-HuEPO administration is safe and feasible at the dose studied. Additional controlled trials utilizing higher doses of r-HuEPO and larger numbers of patients are justified. C1 UNIV CALIF SAN FRANCISCO, CARDIOVASC RES INST, SAN FRANCISCO, CA 94143 USA. ORTHO PHARMACEUT CORP, RARITAN, NJ 08869 USA. USN HOSP, DEPT PEDIAT, OAKLAND, CA USA. RP SHANNON, KM (reprint author), UNIV CALIF SAN FRANCISCO, DEPT PEDIAT, ROOM U-432, BOX 0724, SAN FRANCISCO, CA 94143 USA. FU NCRR NIH HHS [MO1RR01271]; NIDDK NIH HHS [DK 32094] NR 19 TC 124 Z9 124 U1 0 U2 0 PU MOSBY-ELSEVIER PI NEW YORK PA 360 PARK AVENUE SOUTH, NEW YORK, NY 10010-1710 USA SN 0022-3476 EI 1097-6833 J9 J PEDIATR-US JI J. Pediatr. PD JUN PY 1991 VL 118 IS 6 BP 949 EP 955 DI 10.1016/S0022-3476(05)82217-6 PG 7 WC Pediatrics SC Pediatrics GA FQ108 UT WOS:A1991FQ10800025 PM 2040933 ER PT J AU METZLER, DG SEAMONS, BC MELLONIG, JT GHER, ME GRAY, JL AF METZLER, DG SEAMONS, BC MELLONIG, JT GHER, ME GRAY, JL TI CLINICAL-EVALUATION OF GUIDED TISSUE REGENERATION IN THE TREATMENT OF MAXILLARY CLASS-II MOLAR FURCATION INVASIONS SO JOURNAL OF PERIODONTOLOGY LA English DT Article DE SURGICAL FLAPS; FURCATION DEFECTS THERAPY; PERIODONTITIS THERAPY; CONNECTIVE TISSUE ATTACHMENT; GUIDED TISSUE REGENERATION ID HEALING FOLLOWING IMPLANTATION; PERIODONTITIS-AFFECTED ROOTS; GINGIVAL CONNECTIVE-TISSUE; ATTACHMENT FORMATION; HISTOLOGIC EVALUATION; MANDIBULAR MOLARS; CEMENTUM-LIKE; LIGAMENT; CELLS; BONE AB THIS INVESTIGATION ASSESSED AND COMPARED the clinical efficacy of combined open flap debridement/occlusive membrane therapy versus open flap debridement therapy alone, in the treatment of maxillary periodontal furcation defects. Seventeen patients presenting with advanced adult periodontitis, including at least one pair of Class II maxillary furcal defects, comprised the study group. Following completion of a hygienic phase of treatment, measurements were made with calibrated periodontal probes to determine soft tissue recession, probing pocket depths, and attachment levels. Each pair of furcation defects was surgically exposed and hard tissue measurements obtained. Defects were treated with either open flap debridement and a polytetrafluoroethylene periodontal membrane or open flap debridement alone. Membranes were removed at 4 to 6 weeks. Six months postsurgery, soft tissue measurements were repeated and all sites were surgically re-entered to obtain hard tissue measurements. No statistically significant differences were found in recession, probing depth reductions, clinical attachment gains, or resorption of alveolar crest height between test and control groups. Results for these parameters were inconsistent and unpredictable. Statistically significant improvements were found, however, in horizontal open probing attachment (HOPA) and vertical open probing attachment (VOPA) between experimental and control sites. The GTR procedure as used in this study likely has limited application as a therapeutic modality for Class II furcations of maxillary molars. Modifications or improvements in the procedure may result in more predictable healing of these lesions. C1 USN HOSP,DEPT PERIODONT,YOKOSUKA,JAPAN. USN,DENT CLIN,ROTA,SPAIN. RP METZLER, DG (reprint author), USN,CTR DENT,DEPT PERIODONT,CAMP LEJEUNE,NC 28542, USA. NR 34 TC 95 Z9 99 U1 1 U2 2 PU AMER ACAD PERIODONTOLOGY PI CHICAGO PA 737 NORTH MICHIGAN AVENUE, SUITE 800, CHICAGO, IL 60611-2690 SN 0022-3492 J9 J PERIODONTOL JI J. Periodont. PD JUN PY 1991 VL 62 IS 6 BP 353 EP 360 PG 8 WC Dentistry, Oral Surgery & Medicine SC Dentistry, Oral Surgery & Medicine GA FQ796 UT WOS:A1991FQ79600001 PM 1870064 ER PT J AU NGAI, KL AF NGAI, KL TI COUPLING SCHEME APPLIED TO SOLVENT RELAXATION MODIFIED BY DISSOLVED POLYMER-MOLECULES SO JOURNAL OF POLYMER SCIENCE PART B-POLYMER PHYSICS LA English DT Article ID OSCILLATORY FLOW BIREFRINGENCE; STRETCHED-EXPONENTIAL RELAXATION; LINEAR AMORPHOUS POLYMERS; SUPERCOOLED LIQUID-STATE; VOGEL-FULCHER BEHAVIOR; GLASS-TRANSITION; TEMPERATURE-DEPENDENCE; POLYVINYL ACETATE); DIELECTRIC-RELAXATION; TERMINAL DISPERSIONS AB A coupling scheme which has been successful in explaining relaxation properties of neat solvents can also predict their modifications by dissolved polymer molecules. RP NGAI, KL (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 71 TC 9 Z9 9 U1 0 U2 0 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 JUN PY 1991 VL 29 IS 7 BP 867 EP 876 DI 10.1002/polb.1991.090290711 PG 10 WC Polymer Science SC Polymer Science GA FP248 UT WOS:A1991FP24800011 ER PT J AU LOWEMA, CK KIPP, DO VANDERAH, TA AF LOWEMA, CK KIPP, DO VANDERAH, TA TI ON THE CRYSTAL-STRUCTURE OF KINS2-I SO JOURNAL OF SOLID STATE CHEMISTRY LA English DT Article ID TERNARY CHALCOGENIDES RP LOWEMA, CK (reprint author), USN,CTR WEAP,RES DEPT,DIV CHEM,CHINA LAKE,CA 93555, USA. NR 19 TC 14 Z9 14 U1 1 U2 3 PU ACADEMIC PRESS INC JNL-COMP SUBSCRIPTIONS PI SAN DIEGO PA 525 B ST, STE 1900, SAN DIEGO, CA 92101-4495 SN 0022-4596 J9 J SOLID STATE CHEM JI J. Solid State Chem. PD JUN PY 1991 VL 92 IS 2 BP 520 EP 530 DI 10.1016/0022-4596(91)90358-O PG 11 WC Chemistry, Inorganic & Nuclear; Chemistry, Physical SC Chemistry GA FP224 UT WOS:A1991FP22400026 ER PT J AU KARGL, SG MARSTON, PL AF KARGL, SG MARSTON, PL TI RAY SYNTHESIS OF THE FORM FUNCTION FOR BACKSCATTERING FROM AN ELASTIC SPHERICAL-SHELL - LEAKY LAMB WAVES AND LONGITUDINAL RESONANCES SO JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA LA English DT Article ID SOMMERFELD-WATSON TRANSFORMATION; 3-DIMENSIONAL GREENS-FUNCTION; CYLINDRICAL-SHELL; EXPERIMENTAL CONFIRMATION; GLORY SCATTERING; SPHERES; SOUND; ECHOES AB An acoustic ray analysis is employed in synthesizing the form function for backscattering, f(theta = pi,ka), from a fluid-loaded evacuated elastic spherical shell where k is the wave number of the incident plane wave and a is the outer radius of the shell. The synthesis contains a component associated with a specular reflection, f(sp), and contributions from leaky Lamb waves. The contribution f(l) of the l th leaky Lamb wave is expressible in a Fabry-Perot resonator form [P. L. Marston, J. Acoust. Soc. Am. 83, 25-37 (1988)]. A comparison of the ray synthesis for f(ka) with the exact partial-wave series representation for a 440c stainless-steel shell verifies the usefulness of the ray synthesis for the present case of a shell. The present synthesis is also new in that it includes the effects of longitudinal resonances on f(sp). A novel ray synthesis of f(sp) indicates a significant resonance effect near the condition k(L)h = n-pi (n = 1,2,...). The thickness of the shell is h, and k(L) = omega/c(L) is the longitudinal wave number where c(L) is the longitudinal speed of sound in the elastic material. The ray synthesis demonstrates that the curvature of the shell is essential to the modeling of longitudinal resonances. Although acoustic ray modeling is generally a high-frequency technique, the ray synthesis of f(ka) for a 440c stainless-steel shell appears to be applicable for ka as small as 7. Certain anomalies in the synthesis are investigated to better understand the limitations of the present ray model. C1 WASHINGTON STATE UNIV,DEPT PHYS,PULLMAN,WA 99164. RP KARGL, SG (reprint author), USN,CTR NAV COASTAL SYST,CODE 2120,PANAMA CITY,FL 32407, USA. RI CHEN, Jiangang/A-1549-2011 NR 40 TC 27 Z9 27 U1 0 U2 2 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0001-4966 J9 J ACOUST SOC AM JI J. Acoust. Soc. Am. PD JUN PY 1991 VL 89 IS 6 BP 2545 EP 2558 DI 10.1121/1.400694 PG 14 WC Acoustics; Audiology & Speech-Language Pathology SC Acoustics; Audiology & Speech-Language Pathology GA FP536 UT WOS:A1991FP53600005 ER PT J AU GAUNAURD, GC WERBY, MF AF GAUNAURD, GC WERBY, MF TI SIMILARITIES BETWEEN VARIOUS LAMB WAVES IN SUBMERGED SPHERICAL-SHELLS, AND RAYLEIGH-WAVES IN ELASTIC SPHERES AND FLAT HALF-SPACES SO JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA LA English DT Article ID SONAR AB A variety of resonance features are studied in the back-scattering cross sections (BSCS) of an air-filled metal spherical shell submerged in water and insonified by a plane cw sound wave. Rayleigh (R) and whispering gallery (WG) waves were originally investigated for vibrational purposes for (flat) half-spaces in contact with vacuum. Lamb waves were originally studied in flat plates also in contact with vacuum. These old findings are generalized to the cases of an elastic spherical shell (o.d./i.d. = 2a/2b) fluid-loaded on both surfaces, and excited by an incident plane wave. The various (leaky-type) Lamb waves present in the shell are shown to reduce to the earlier R/WG waves as a >> 1 >> b and rho-f --> 0. The manner in which each one of these various shell waves manifests itself in the various frequency bands of the shell's BSCS as perceived by a remote sensor is also studied. Dispersion plots for the various phase velocities of the various waves are displayed in very wide (i.e., 0 < ka < 500) bands, and a number of analogies between Lamb and R/WG waves are obtained as the submerged shell becomes a solid sphere (b << a), and vice versa (b less-than-or-similar-to a). The fluid loadings, the finite shell thickness, and the curvatures of the structure all generate novel types of waves in the shell (that manifest their effects in its BSCS) that could have never emerged from earlier models that ignored these effects, and which are analyzed here. C1 USN,OCEAN & ATMOSPHER RES LAB 221,DIV NUMER MODELLING,BAY ST LOUIS,MS 39524. RP GAUNAURD, GC (reprint author), USN,CTR SURFACE WARFARE,RES DEPT R42,WHITE OAK,SILVER SPRING,MD 20903, USA. NR 28 TC 12 Z9 12 U1 1 U2 2 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0001-4966 J9 J ACOUST SOC AM JI J. Acoust. Soc. Am. PD JUN PY 1991 VL 89 IS 6 BP 2731 EP 2739 DI 10.1121/1.400712 PG 9 WC Acoustics; Audiology & Speech-Language Pathology SC Acoustics; Audiology & Speech-Language Pathology GA FP536 UT WOS:A1991FP53600025 ER PT J AU BUTLER, JL PORTER, DT AF BUTLER, JL PORTER, DT TI A FOURIER-TRANSFORM SOLUTION FOR THE ACOUSTIC RADIATION FROM A SOURCE NEAR AN ELASTIC CYLINDER SO JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA LA English DT Article AB A Fourier transform solution for a small source on or in the vicinity of an elastic cylinder is developed. The case of acoustic radiation from the source and cylinder and, also, the direct mechanical coupling to an elastic shell are treated in a consistent manner that allows coupling through the transducer. Numerical results are given for a sample case of a thin-walled elastic tube and these results are compared with the limiting cases of a rigid and soft cylinder. C1 USN,CTR UNDERWATER SYST,NEW LONDON,CT 06320. RP BUTLER, JL (reprint author), IMAGE ACOUST INC,POB 6,N MARSHFIELD,MA 02059, USA. NR 11 TC 0 Z9 0 U1 0 U2 1 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0001-4966 J9 J ACOUST SOC AM JI J. Acoust. Soc. Am. PD JUN PY 1991 VL 89 IS 6 BP 2774 EP 2785 DI 10.1121/1.400717 PG 12 WC Acoustics; Audiology & Speech-Language Pathology SC Acoustics; Audiology & Speech-Language Pathology GA FP536 UT WOS:A1991FP53600031 ER PT J AU JOHNSON, CS AF JOHNSON, CS TI HEARING THRESHOLDS FOR PERIODIC 60-KHZ TONE PULSES IN THE BELUGA WHALE SO JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA LA English DT Article ID DOLPHIN AB Masked thresholds for periodic 60-kHz tone pulses were measured for the beluga whale (Delphinapterus leucas) for tone pulse durations of 0.025, 0.1, 0.3, 0.8, and 1.6 ms, and with repetition times ranging from 770 ms to continuous tones. In addition, masked thresholds were also measured for single pulse stimuli of 0.025, 0.1, 0.3, 0.8, 1.6, 10, 50, 200, and 1000 ms in duration. The data analysis used with human data was not adequate for the three shortest periodic tone stimuli and a rectangular filter, energy detection, model was used for these cases. The integration time estimated from the single tone pulse data (20 ms) was much longer than those obtained from the periodic tone pulse results. Whale integration times for periodic pulses were found to vary almost directly with pulse duration, unlike those reported humans, which are constant and independent of pulse duration. A system bandwith of 1000 Hz was found to fit the data, a bandwidth much smaller than the critical ratio (2400 Hz) previously reported for the beluga whale. RP JOHNSON, CS (reprint author), USN,CTR OCEAN SYST,SAN DIEGO,CA 92152, USA. NR 13 TC 11 Z9 11 U1 0 U2 3 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0001-4966 J9 J ACOUST SOC AM JI J. Acoust. Soc. Am. PD JUN PY 1991 VL 89 IS 6 BP 2996 EP 3001 DI 10.1121/1.400736 PG 6 WC Acoustics; Audiology & Speech-Language Pathology SC Acoustics; Audiology & Speech-Language Pathology GA FP536 UT WOS:A1991FP53600053 ER PT J AU SCHARNHORST, KP AF SCHARNHORST, KP TI APPROXIMATE EXPRESSIONS FOR THE LOWEST DIPOLE RESONANCE FREQUENCY OF AN ELASTIC SPHERE IN AN ELASTIC SOLID SO JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA LA English DT Letter AB The lowest dipole resonance frequency of rigid spherical inclusions in low shear media is known to be omega = 3(c(s)/a)/(1 + 2-rhoBAR)1/2. A generalization of this formula to relatively large matrix shear regidities is considered. RP SCHARNHORST, KP (reprint author), USN,CTR SURFACE WARFARE,WHITE OAK,SILVER SPRING,MD 20903, USA. NR 4 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 JUN PY 1991 VL 89 IS 6 BP 3002 EP 3003 DI 10.1121/1.400737 PG 2 WC Acoustics; Audiology & Speech-Language Pathology SC Acoustics; Audiology & Speech-Language Pathology GA FP536 UT WOS:A1991FP53600054 ER PT J AU MRSTIK, BJ MCMARR, PJ BLANCO, JR BENNETT, JM AF MRSTIK, BJ MCMARR, PJ BLANCO, JR BENNETT, JM TI MEASUREMENT OF THE THICKNESS AND OPTICAL-PROPERTIES OF THERMAL OXIDES OF SI USING SPECTROSCOPIC ELLIPSOMETRY AND STYLUS PROFILOMETRY SO JOURNAL OF THE ELECTROCHEMICAL SOCIETY LA English DT Article ID SILICON DIOXIDE FILMS; GROWN OXIDE; INTERFACE; OXYGEN; GE; CONSTANTS; LAYERS; GAAS AB Thermal oxides of Si were grown in dry oxygen at 1000-degrees-C. Spectroscopic ellipsometry measurements were performed on these samples over the photon energy range from 1.6-5.0 eV. Effective medium modeling of these measurements was used to determine the thicknesses of the oxides and their effective refractive indexes. The oxide thicknesses were also measured directly using high accuracy stylus profilometry. The thickness values obtained using the two techniques differed by an average of +/- 5 angstrom. The effective refractive indexes of the oxides were found to be significantly larger than those of fused silica. The larger values result from the larger densities of the thermal oxides as compared to fused silica. The thermal oxides were found to have an average density 1.91% greater than that of fused silica. This density increase, and consequent large effective refractive indexes for the samples, is discussed in the context of previous ellipsometry studies on thermal oxides of Si. In addition, a procedure is described in which spectroscopic ellipsometry measurements can be used, with no analysis, to determine the optical properties of the substrate. C1 CALIF STATE UNIV NORTHRIDGE,DEPT PHYS & ASTRON,NORTHRIDGE,CA 91330. USN,CTR WEAP,MICHELSON LAB,CHINA LAKE,CA 93555. RP MRSTIK, BJ (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 36 TC 12 Z9 12 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 JUN PY 1991 VL 138 IS 6 BP 1770 EP 1778 DI 10.1149/1.2085871 PG 9 WC Electrochemistry; Materials Science, Coatings & Films SC Electrochemistry; Materials Science GA FQ104 UT WOS:A1991FQ10400047 ER PT J AU MORRILL, JC JOHNSON, BK HYAMS, C OKOTH, F TUKEI, PM MUGAMBI, M WOODY, J AF MORRILL, JC JOHNSON, BK HYAMS, C OKOTH, F TUKEI, PM MUGAMBI, M WOODY, J TI SEROLOGICAL EVIDENCE OF ARBOVIRAL INFECTIONS AMONG HUMANS OF COASTAL KENYA SO JOURNAL OF TROPICAL MEDICINE AND HYGIENE LA English DT Article ID IMMUNOFLUORESCENCE; ANTIBODIES AB A serosurvey was conducted during September 1987 for evidence of human arboviral infections in the Coast Province of Kenya. Sera were collected from 1624 outpatients at three hospitals and tested for antibody to eight arboviruses by the indirect immunofluorescent antibody technique. Antibody prevalence rates were: Rift Valley fever, 2.8%; Sindbis, 2.6%; dugbe, 2.1%; dengue-2, 1.0%; West Nile, 0.9%; chikungunya, 0.7% and Nairobi sheep disease, 0.3%. Evidence of Crimean-Congo haemorrhagic fever viral antibody was not detected. The data suggested low arbovirus activity since 1982, when an epidemic of dengue occurred in this region, and revealed the first evidence of dugbe viral infection among humans in Kenya. C1 USN,MED RES UNIT 3,CAIRO,EGYPT. KENYA GOVT MED RES CTR,VIRUS RES CTR,NAIROBI,KENYA. NR 8 TC 23 Z9 23 U1 1 U2 3 PU BLACKWELL SCIENCE LTD PI OXFORD PA OSNEY MEAD, OXFORD, OXON, ENGLAND OX2 0EL SN 0022-5304 J9 J TROP MED HYG JI J. Trop. Med. Hyg. PD JUN PY 1991 VL 94 IS 3 BP 166 EP 168 PG 3 WC Public, Environmental & Occupational Health; Tropical Medicine SC Public, Environmental & Occupational Health; Tropical Medicine GA FT288 UT WOS:A1991FT28800006 PM 2051522 ER PT J AU STACKPOLE, LE AF STACKPOLE, LE TI SOFTWARE AS A LIBRARY MATERIAL IN SPECIAL-LIBRARIES - A SURVEY AND CASE-STUDY SO LIBRARY TRENDS LA English DT Article RP STACKPOLE, LE (reprint author), USN,RES LAB,RUTH H HOOKER RES LIB & TECH INFORMAT CTR,4555 OVERLOOK AVE SW,WASHINGTON,DC 20375, USA. NR 3 TC 0 Z9 0 U1 0 U2 0 PU GSLIS PUBLICATIONS PI CHAMPAIGN PA 501 E DANIEL ST, CHAMPAIGN, IL 61820-6211 SN 0024-2594 J9 LIBR TRENDS JI Libr. Trends PD SUM PY 1991 VL 40 IS 1 BP 160 EP 193 PG 34 WC Information Science & Library Science SC Information Science & Library Science GA GK830 UT WOS:A1991GK83000010 ER PT J AU SPANOS, G REYNOLDS, WT VANDERMEER, RA AF SPANOS, G REYNOLDS, WT VANDERMEER, RA TI THE ROLE OF LEDGES IN THE PROEUTECTOID FERRITE AND PROEUTECTOID CEMENTITE REACTIONS IN STEEL SO METALLURGICAL TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE LA English DT Article ID FE-C ALLOYS; FCC-BCC BOUNDARIES; GROWTH-KINETICS; INTERPHASE BOUNDARIES; TRANSFORMATION INTERFACES; SYMPATHETIC NUCLEATION; PHASE-TRANSFORMATIONS; MO ALLOYS; PLATES; AUSTENITE AB The influence of interphase boundary ledges on the growth and morphology of proeutectoid ferrite and proeutectoid cementite precipitates is steel is examined. After reviewing current theoretical treatments of growth by the ledge mechanism, investigations that clearly document the presence and motion of ledges with thermionic emmission electron microscopy (THEEM) and transmission electron microscopy (TEM) are reviewed. A fundamental distinction is made between two types of ledges: (1) mobile growth ledges whose lateral migration displaces the interphase boundary and (2) misfit-compensating structural ledges. Both types of ledges strongly affect the apparent habit plane and aspect ratio of precipitate plates. Agreement between measured growth rates of proeutectoid ferrite and cementite (plates and allotriomorphs) and predicted growth kinetics assuming volume diffusion-controlled migration of ledge-free disordered boundaries is shown to be consistently poor. Physically realistic growth models should incorporate the ledge mechanism. More accurate comparisons of the growth models with experimental data will need to account for observed ledge heights, interledge spacings, and ledge velocities. In this vein, the sluggish growth kinetics of cementite allotriomorphs observed in an Fe-C alloy are shown to be quantitatively consistent with a strong increase in interledge spacing with time. C1 VIRGINIA POLYTECH INST & STATE UNIV, DEPT MAT ENGN, BLACKSBURG, VA 24061 USA. RP SPANOS, G (reprint author), USN, RES LAB, PHYS MET BRANCH, WASHINGTON, DC 20375 USA. NR 84 TC 9 Z9 9 U1 0 U2 0 PU MINERALS METALS MATERIALS SOC PI WARRENDALE PA 184 THORN HILL RD, WARRENDALE, PA 15086 USA SN 0360-2133 J9 METALL TRANS A PD JUN PY 1991 VL 22 IS 6 BP 1367 EP 1380 DI 10.1007/BF02660669 PG 14 WC Materials Science, Multidisciplinary SC Materials Science GA FQ387 UT WOS:A1991FQ38700026 ER PT J AU LOONEY, RE AF LOONEY, RE TI REVOLUTION AND ECONOMIC TRANSITION - THE IRANIAN EXPERIENCE - AMIRAHMADI,H SO MIDDLE EAST JOURNAL LA English DT Book Review C1 NAVAL POSTGRAD SCH,NATL SECUR AFFAIRS,MONTEREY,CA. NR 1 TC 0 Z9 0 U1 0 U2 0 PU MIDDLE EAST INSTITUTE PI WASHINGTON PA 1761 N STREET NW, CIRCULATION DEPT, WASHINGTON, DC 20036-2882 SN 0026-3141 J9 MIDDLE EAST J JI Middle East J. PD SUM PY 1991 VL 45 IS 3 BP 521 EP 523 PG 3 WC Area Studies SC Area Studies GA KZ387 UT WOS:A1991KZ38700026 ER PT J AU WIRTZ, JJ AF WIRTZ, JJ TI UNGUIDED MISSILES - HOW AMERICA BUYS ITS WEAPONS - HAMPSON,F SO MILLENNIUM-JOURNAL OF INTERNATIONAL STUDIES LA English DT Book Review RP WIRTZ, JJ (reprint author), NAVAL POSTGRADUATE SCH,MONTEREY,CA, 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 1991 VL 20 IS 2 BP 317 EP 319 PG 3 WC International Relations SC International Relations GA GN828 UT WOS:A1991GN82800019 ER PT J AU CLOWES, RG LEGGETT, SK SAVAGE, A AF CLOWES, RG LEGGETT, SK SAVAGE, A TI IRAS-10479-2808 - A QUASAR SO MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY LA English DT Article ID COLOR-SELECTED QUASARS; IRAS POINT SOURCES; GALAXIES; DISCOVERY; EMISSION; RADIO AB The IRAS point source 10479-2808 is a quasar with B(J) approximately 16 and z = 0.190. It has M(B) approximately -23.5 and L(IR) approximately 10(12) L. (H0 = 75 km s-1 Mpc-1 and q0 = 0.5). It is not in the Parkes and Molonglo radio catalogues. At the resolution of the UK and ESO Schmidt telescopes it appears to be star-like, with no sign of surrounding fuzz or interactions; it is probably optically variable. IRAS 10479-2808 seems to be typical of the IRAS-selected quasars. We suggest that they are not special compared with other quasars, and are mainly indicating the incompleteness of bright-quasar surveys. C1 USN OBSERV,FLAGSTAFF,AZ 86002. UK SCHMIDT TELESCOPE UNIT,ANGLO AUSTRALIAN OBSERV,COONABARABRAN,NSW 2357,AUSTRALIA. RP CLOWES, RG (reprint author), ROYAL OBSERV,BLACKFORD HILL,EDINBURGH EH9 3HJ,MIDLOTHIAN,SCOTLAND. NR 22 TC 9 Z9 9 U1 0 U2 0 PU BLACKWELL SCIENCE LTD PI OXFORD PA OSNEY MEAD, OXFORD, OXON, ENGLAND OX2 0EL SN 0035-8711 J9 MON NOT R ASTRON SOC JI Mon. Not. Roy. Astron. Soc. PD JUN 1 PY 1991 VL 250 IS 3 BP 597 EP 601 PG 5 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA FP180 UT WOS:A1991FP18000013 ER PT J AU HARR, PA ELSBERRY, RL AF HARR, PA ELSBERRY, RL TI TROPICAL CYCLONE TRACK CHARACTERISTICS AS A FUNCTION OF LARGE-SCALE CIRCULATION ANOMALIES SO MONTHLY WEATHER REVIEW LA English DT Article ID 40-50 DAY OSCILLATION; OBSERVATIONAL ANALYSIS; EL-NINO; PACIFIC; MOTION; WIND AB Factors that contribute to intraseasonal variability in western North Pacific tropical cyclone track types are investigated. It is hypothesized that the 700-mb large-scale circulation can affect tropical cyclone track characteristics by enhancing or excluding genesis in certain regions, and concurrently prohibiting or favoring recurving versus straight tracks. A track-type climatology indicates that genesis location alone may explain some of the variability in track type. Although some genesis regions have no preference for straight-moving or recurving tracks, a formation north of 20-degrees-N or east of 150-degrees-E and north of 10-degrees-N favors a recurvature track. These recurving storms are classified as recurving-north, and recurving stroms that form in regions with nearly equal probability of straight or recurving tracks are classified as recurving-south. A compositing technique is used to define anomalous 700-mb large-scale circulations that exist during the formation of tropical cyclones that subsequently follow either a straight track or one of the two types of recurving tracks. Anomalous circulations associated with extended periods that do not contain any tropical cyclones are also identified. Physically and statistically different anomalous large-scale circulation patterns exist at the time of genesis for storms following each track type and for inactive periods. The large-scale anomalies describe variations in the positions and intensities of the monsoon trough and subtropical ridge. During genesis of straight-moving and recurving-south storms, anomalous large-scale horizontal cyclonic shear exists throughout the South China Sea and Philippine Sea. During straight-moving storms, cyclonic shear increases because of anomalous easterlies along the southern boundary of an enhanced subtropical ridge. During recurving-south storms, anomalous equatorial westerlies and cross-equatorial flow from the Southern Hemisphere act to increase the cyclonic shear. The track-type climatology is used to predict the subsequent track type based only on genesis location. In a second scheme, the distributions of anomalous 700-mb zonal wind components in 5-degrees latitude bands averaged between 100-degrees and 140-degrees-E are used to predict the most likely track type. The large-scale 700-mb anomalies at genesis time determine the subsequent track type in a majority of cases. The skill of this simple scheme exceeds that from the climatological probability of track type. RP HARR, PA (reprint author), USN,POSTGRAD SCH,DEPT METEOROL,CODE MR-HP,MONTEREY,CA 93943, USA. NR 27 TC 76 Z9 92 U1 1 U2 10 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 1991 VL 119 IS 6 BP 1448 EP 1468 DI 10.1175/1520-0493(1991)119<1448:TCTCAA>2.0.CO;2 PG 21 WC Meteorology & Atmospheric Sciences SC Meteorology & Atmospheric Sciences GA FR466 UT WOS:A1991FR46600007 ER PT J AU PAULEY, PM WU, XH AF PAULEY, PM WU, XH TI THE THEORETICAL, DISCRETE, AND ACTUAL RESPONSE OF THE BARNES OBJECTIVE ANALYSIS SCHEME FOR ONE-DIMENSIONAL AND 2-DIMENSIONAL FIELDS - REPLY SO MONTHLY WEATHER REVIEW LA English DT Note C1 UNIV WISCONSIN,CTR SPACE SCI & ENGN,MADISON,WI 53706. RP PAULEY, PM (reprint author), USN,POSTGRAD SCH,DEPT METEOROL,MONTEREY,CA 93943, USA. NR 6 TC 0 Z9 0 U1 0 U2 0 PU AMER METEOROLOGICAL SOC PI BOSTON PA 45 BEACON ST, BOSTON, MA 02108-3693 SN 0027-0644 J9 MON WEATHER REV JI Mon. Weather Rev. PD JUN PY 1991 VL 119 IS 6 BP 1493 EP 1496 DI 10.1175/1520-0493(1991)119<1493:R>2.0.CO;2 PG 4 WC Meteorology & Atmospheric Sciences SC Meteorology & Atmospheric Sciences GA FR466 UT WOS:A1991FR46600011 ER PT J AU REIMANN, CT BROWN, WL GROSJEAN, DE NOWAKOWSKI, MJ BULLER, WT CUI, ST JOHNSON, RE AF REIMANN, CT BROWN, WL GROSJEAN, DE NOWAKOWSKI, MJ BULLER, WT CUI, ST JOHNSON, RE TI KINETIC-ENERGY AND VIBRATIONAL-STATE POPULATION-DISTRIBUTION OF AR2-STAR DIMERS DESORBED FROM MEV ION-EXCITED SOLID ARGON FILMS SO NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS LA English DT Article; Proceedings Paper CT 8TH INTERNATIONAL WORKSHOP ON INELASTIC ION-SURFACE COLLISIONS CY SEP 17-21, 1990 CL WIENER NEUSTADT, AUSTRIA SP UNIV VIENNA, INST ALLEGEMEINE PHYS ID ELECTRON-STIMULATED DESORPTION; RARE-GAS SOLIDS; ULTRAVIOLET-LASER SPECTROSCOPY; VACUUM ULTRAVIOLET; POTENTIAL CURVES; EJECTION; ATOMS; SURFACE; DEPENDENCE; CASCADES AB Luminescence in the wavelength range 1000 to 1400 angstrom from electronically excited solid argon films is analyzed in detail. The component of the spectrum due to a luminescent plume of desorbed Ar2* (3-SIGMA-u+:1u, 0u-) is isolated. Under pulsed excitation of the films, a delayed onset of luminescence is observed when the portion of the plume nearest the argon film is occluded. This delayed onset is analyzed as a time-of-flight, giving the kinetic energy (KE) of desorbed Ar2*. The average KE ranges from 0.06 eV for Ar2* emitting at 1110 angstrom, to 0.094 eV for Ar2* emitting at 1210 angstrom. There is a large spread in the velocity about the average, with a maximum KE of 0.3 eV. Information is obtained on the degree of vibrational relaxation of the desorbed Ar2* by fitting the observed plume luminescence spectrum to a linear combination of quantum mechanically calculated spectra of the vibrational levels of Ar2*. The population distribution of the vibrational levels of desorbed Ar2* is broad but peaks at the three lowest states. Models for Ar2* desorption are discussed. C1 USN,RES LAB,WASHINGTON,DC 20375. AT&T BELL LABS,MURRAY HILL,NJ 07974. UNIV VIRGINIA,DEPT NUCL ENGN & ENGN PHYS,CHARLOTTESVILLE,VA 22901. OI Buller, William/0000-0003-1692-979X NR 33 TC 8 Z9 8 U1 0 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-583X J9 NUCL INSTRUM METH B JI Nucl. Instrum. Methods Phys. Res. Sect. B-Beam Interact. Mater. Atoms PD JUN PY 1991 VL 58 IS 3-4 BP 404 EP 410 DI 10.1016/0168-583X(91)95877-G PG 7 WC Instruments & Instrumentation; Nuclear Science & Technology; Physics, Atomic, Molecular & Chemical; Physics, Nuclear SC Instruments & Instrumentation; Nuclear Science & Technology; Physics GA FY478 UT WOS:A1991FY47800020 ER PT J AU SMITH, DL SKUTA, GL KINCAID, MC RABBANI, R CRUESS, DF KAO, SF AF SMITH, DL SKUTA, GL KINCAID, MC RABBANI, R CRUESS, DF KAO, SF TI THE EFFECTS OF GLAUCOMA MEDICATIONS ON TENON CAPSULE AND CONJUNCTIVA IN THE RABBIT SO OPHTHALMIC SURGERY AND LASERS LA English DT Article ID TRABECULECTOMY; DRUGS; EYES AB Glaucoma filtering surgery fails most frequently due to fibrosis at the episcleral-conjunctival/Tenon's capsule interface. Sherwood et al have suggested that chronic topical antiglaucoma medications increase conjunctival inflammatory cells, which could increase the likelihood of fibrosis and subsequent bleb failure.1 In a pilot study in a rabbit model, we placed timolol, pilocarpine, and epinephrine, or a combination of all three, in one eye of 24 animals twice daily for 7 months. The fellow eye received distilled water. Microscopic examination revealed no stastistically significant change in the number of acute or chronic inflammatory cells, fibroblasts, or goblet cells in the treated as compared with the control eyes. A longer duration of drug administration, or drug administration followed by surgical intervention, may be required to produce an effect on the conjunctiva and Tenon's capsule, if such an effect exists. C1 UNIV MICHIGAN,WK KELLOGG EYE CTR,DEPT OPHTHALMOL,1000 WALL ST,ANN ARBOR,MI 48105. USN HOSP,DEPT OPHTHALMOL,BETHESDA,MD 20814. ST LOUIS UNIV,SCH MED,BETHESDA EYE INST,DEPT OPHTHALMOL,ST LOUIS,MO 63104. ST LOUIS UNIV,SCH MED,BETHESDA EYE INST,DEPT PATHOL,ST LOUIS,MO 63104. UNIFORMED SERV UNIV HLTH SCI,BETHESDA,MD 20814. NR 17 TC 23 Z9 23 U1 0 U2 0 PU SLACK INC PI THOROFARE PA 6900 GROVE RD, THOROFARE, NJ 08086 SN 0022-023X J9 OPHTHALMIC SURG LAS JI Ophthalmic Surg. Lasers PD JUN PY 1991 VL 22 IS 6 BP 336 EP 340 PG 5 WC Ophthalmology; Surgery SC Ophthalmology; Surgery GA FW405 UT WOS:A1991FW40500006 PM 1896170 ER PT J AU SCHEPS, R MYERS, JF SERREZE, HB ROSENBERG, A MORRIS, RC LONG, M AF SCHEPS, R MYERS, JF SERREZE, HB ROSENBERG, A MORRIS, RC LONG, M TI DIODE-PUMPED CR-LISRALF6 LASER SO OPTICS LETTERS LA English DT Article AB A Cr:LiSrAlF6 laser is diode pumped with both commercial 10-mW visible laser diodes and a higher-power 100-mW cw, 265-mW pulsed diode. Polarization combination of pump diodes to reach threshold is demonstrated with two low-power lasers. Pumping with the high-power diode produced powers of 19.9 mW cw and 78 mW pulsed. Details of the Cr:LiSrAlF6 crystal growth and high-power diode architecture are presented, along with optical characterization data for the laser resonator. Passive losses in the crystal are less than 0.l% cm-1. C1 MCDONNELL DOUGLAS ELECTR SYST CO,CTR OPTOELECTR,ELMSFORD,NY 10523. ALLIED SIGNAL INC,CTR CORP RES & TECHNOL,MORRISTOWN,NJ 07962. RP SCHEPS, R (reprint author), USN,CTR OCEAN SYST,CODE 843,SAN DIEGO,CA 92152, USA. NR 9 TC 64 Z9 65 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 JUN 1 PY 1991 VL 16 IS 11 BP 820 EP 822 DI 10.1364/OL.16.000820 PG 3 WC Optics SC Optics GA FP178 UT WOS:A1991FP17800014 PM 19776796 ER PT J AU GIBSON, WK BARTOSH, R TIMPERLAKE, R AF GIBSON, WK BARTOSH, R TIMPERLAKE, R TI ACUTE HEMATOGENOUS EPIPHYSEAL OSTEOMYELITIS SO ORTHOPEDICS LA English DT Note RP GIBSON, WK (reprint author), USN,HOSP PORTSMOUTH,DEPT ORTHOPED,PORTSMOUTH,VA 23708, USA. NR 0 TC 6 Z9 6 U1 0 U2 0 PU SLACK INC PI THOROFARE PA 6900 GROVE RD, THOROFARE, NJ 08086 SN 0147-7447 J9 ORTHOPEDICS JI Orthopedics PD JUN PY 1991 VL 14 IS 6 BP 705 EP 707 PG 3 WC Orthopedics SC Orthopedics GA FR355 UT WOS:A1991FR35500009 PM 1866353 ER PT J AU OBRIEN, F AF OBRIEN, F TI GENERALIZATION OF THE POPULATION-DENSITY INDEX MODEL SO PERCEPTUAL AND MOTOR SKILLS LA English DT Article RP OBRIEN, F (reprint author), USN,CTR UNDERWATER SYST,CODE 2211,B 1171-1,NEWPORT,RI 02841, USA. NR 4 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 1991 VL 72 IS 3 BP 1381 EP 1382 DI 10.2466/PMS.72.4.1381-1382 PN 2 PG 2 WC Psychology, Experimental SC Psychology GA GA987 UT WOS:A1991GA98700062 ER PT J AU MULLEN, B SALAS, E MILLER, N AF MULLEN, B SALAS, E MILLER, N TI USING METAANALYSIS TO TEST THEORETICAL HYPOTHESES IN SOCIAL-PSYCHOLOGY SO PERSONALITY AND SOCIAL PSYCHOLOGY BULLETIN LA English DT Article ID BEHAVIOR; LEADERSHIP; MODEL C1 USN,CTR TRAINING SYST,ORLANDO,FL 32826. UNIV SO CALIF,DEPT PSYCHOL,LOS ANGELES,CA 90089. RP MULLEN, B (reprint author), SYRACUSE UNIV,DEPT PSYCHOL,SYRACUSE,NY 13210, USA. NR 44 TC 11 Z9 11 U1 1 U2 2 PU SAGE SCIENCE PRESS PI THOUSAND OAKS PA 2455 TELLER RD, THOUSAND OAKS, CA 91320 SN 0146-1672 J9 PERS SOC PSYCHOL B JI Pers. Soc. Psychol. Bull. PD JUN PY 1991 VL 17 IS 3 BP 258 EP 264 DI 10.1177/0146167291173004 PG 7 WC Psychology, Social SC Psychology GA FT364 UT WOS:A1991FT36400004 ER PT J AU MEHL, MJ KLEIN, BM AF MEHL, MJ KLEIN, BM TI ALL-ELECTRON 1ST-PRINCIPLES SUPERCELL TOTAL-ENERGY CALCULATION OF THE VACANCY FORMATION ENERGY IN ALUMINUM SO PHYSICA B-CONDENSED MATTER LA English DT Article ID PSEUDOPOTENTIALS; METALS AB We use the first-principles all-electron linearized augumented plane-wave (LAPW) method to perform self-consistent total-energy electronic structure calculations for the vacancy formation energy in aluminum in the supercell approximation. The method makes no uncontrolled approximations for the shape of the potential. Supercells with 4, 8, 16, and 27 sites are used. When no relaxation is allowed, the formation energy is 0.87, 0.88, 0.89 and 0.86 eV for the 4-, 8-, 16-, and 27-site supercells, respectively. When some of the atoms are allowed to relax about the vacancy the formation energy is lowered by 0.05 eV in the 16-site cell and 0.03 eV in the 27-site cell. These results are in semiquantitative agreement with the experimental formation energy of 0.66 eV. The dependence of the formation energy on cell size is discussed. RP USN, RES LAB, DIV CONDENSED MATTER & RADIAT SCI, COMPLEX SYST THEORY BRANCH, WASHINGTON, DC 20375 USA. RI Mehl, Michael/H-8814-2016 NR 18 TC 36 Z9 36 U1 1 U2 4 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0921-4526 EI 1873-2135 J9 PHYSICA B JI Physica B PD JUN PY 1991 VL 172 IS 1-2 BP 211 EP 215 DI 10.1016/0921-4526(91)90433-F PG 5 WC Physics, Condensed Matter SC Physics GA GA441 UT WOS:A1991GA44100027 ER PT J AU DIVAKARAN, PP RAJAGOPAL, AK AF DIVAKARAN, PP RAJAGOPAL, AK TI SUPERCONDUCTIVITY IN LAYERED MATERIALS - PAIRING THEORY FOR PROJECTIVELY TRANSLATION INVARIANT STATES SO PHYSICA C LA English DT Article ID HIGH-TC SUPERCONDUCTORS; TIME-REVERSAL SYMMETRY; FRACTIONAL-STATISTICS; QUANTUM; QUANTIZATION; VIOLATION; SEARCH; FIELD AB A mechanism for the superconducting transition in layered bulk substances, based on the existence of (non-plane wave) projective unitary representations (PURs) of their symmetry group and the generalisation of the theory of Cooper pairs to such representations, is proposed and investigated. In the continuum limit, the symmetry group appropriate to layering is a subgroup of the three-dimensional Euclidean group. It has an infinite family of PURs which can be characterised by an arbitrary real central charge in the commutators of momentum components within the layer. Quantum kinematics/dynamics in a sector with nonzero central charge (nontrivial PUR) is studied and the invariant one-particle Hamiltonian and equation of motion are shown to be formally those of a spinless charged particle in a magnetic field normal to the layers (pseudocharge in a pseudomagnetic field) irrespective of the actual charge or spin of the particle. The dielectric response of a gas of electrons in a sector with nonzero central charge is then worked out by standard Green function methods and the nature of the dynamically screened two-particle interaction determined. The influence of the pseudocyclotron frequency makes the effective potential attractive in a regime of wave number and frequency whose extent increases with increasing central charge, thus signalling instability towards the formation of (generalised) Cooper pairs. The general gap equation is then set up and, after a standard simplification, reduced to a form whose solution is known to lead to a critical temperature increasing monotonically with central charge. This model of high-temperature superconductivity is parity and time-reversal invariant and is in qualitative agreement with observations including those on the isotope effect. The fundamental differences between this model and the anion model are commented upon and speculative remarks offered on the physical origin and detection of the central charge. C1 USN,RES LAB,WASHINGTON,DC 20375. RP DIVAKARAN, PP (reprint author), TATA INST FUNDAMENTAL RES,HOMI BHABHA RD,BOMBAY 400005,INDIA. NR 38 TC 6 Z9 6 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 1991 VL 176 IS 4-6 BP 457 EP 476 DI 10.1016/0921-4534(91)90050-9 PG 20 WC Physics, Applied SC Physics GA FU216 UT WOS:A1991FU21600017 ER PT J AU FLIFLET, AW LEE, RC GOLD, SH MANHEIMER, WM OTT, E AF FLIFLET, AW LEE, RC GOLD, SH MANHEIMER, WM OTT, E TI TIME-DEPENDENT MULTIMODE SIMULATION OF GYROTRON OSCILLATORS SO PHYSICAL REVIEW A LA English DT Article ID LINEAR-THEORY; EFFICIENCY; OPERATION; DRIVEN; FIELD AB High-power gyrotrons, including both cw and high-peak-power configurations, are increasingly designed to operate in high-mode-density regimes. It has been observed that operation is often single mode even for cavities with dense mode spectra, but the mode density does affect the gyrotron efficiency and the available operating modes. Multimode effects have been studied extensively for the quasioptical gyrotron, but there has been less progress on fully nonlinear formulations for conventional waveguide cavity gyrotrons that involve different transverse modes with irregularly spaced frequencies and unequal coupling impedances. A time-dependent, nonlinear, multimode theory of gyrotrons has been recently developed along with a computer code to carry out the numerical calculations. The code has been used to simulate the operation of a cw-relevant 140-GHz gyrotron experiment carried out at the Massachusetts Institute of Technology (MIT) by K. E. Kreischer et al. [Int. J. Electron. 57, 835 (1984)] and the 750-kV, 35-GHz intense-beam gyrotron experiment at the Naval Research Laboratory (NRL) by Gold et al. [Phys. Fluids 30, 2226 (1987)]. The MIT gyrotron involves competition between two transverse modes: the TE03 and TE23 modes. The NRL gyrotron involves competition between TE(m2) modes and is an example of a three-mode interaction. C1 JAYCOR INC,VIENNA,VA 22182. UNIV MARYLAND,PLASMA RES LAB,COLLEGE PK,MD 20742. RP FLIFLET, AW (reprint author), USN,RES LAB,DIV PLASMA PHYS,BEAM PHYS BRANCH,WASHINGTON,DC 20375, USA. RI O, E/F-1630-2015 NR 19 TC 34 Z9 34 U1 1 U2 2 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1050-2947 J9 PHYS REV A JI Phys. Rev. A PD JUN 1 PY 1991 VL 43 IS 11 BP 6166 EP 6176 DI 10.1103/PhysRevA.43.6166 PG 11 WC Optics; Physics, Atomic, Molecular & Chemical SC Optics; Physics GA FQ056 UT WOS:A1991FQ05600052 ER PT J AU SANDSTROM, SE UBERALL, H AF SANDSTROM, SE UBERALL, H TI CHANNELING RADIATION AND COHERENT BREMSSTRAHLUNG FOR SIMPLE LATTICES - A 3-DIMENSIONAL APPROACH SO PHYSICAL REVIEW B LA English DT Article ID MEV ELECTRONS; SCATTERING; PARTICLES; CRYSTALS; DIAMOND AB The effect of the longitudinal variation of the lattice potential is investigated numerically for the case of electron channeling in the low-energy regime. Corrections to the energy of the emitted photons are found to be three dimensional (3D) rather than longitudinal, in character. These 3D effects are small and of about the same size as the error due to shortcomings in the description of the lattice potential. Coherent bremsstrahlung involves transitions between quantum states that emanate from the 3D nature of the potential. The corresponding photon energies and intensities are calculated and compared to available experimental results. C1 CHALMERS UNIV TECHNOL,INST THEORET PHYS,S-41296 GOTHENBURG,SWEDEN. USN,RES LAB,COMPLEX SYST THEORY BRANCH,WASHINGTON,DC 20375. RP SANDSTROM, SE (reprint author), CATHOLIC UNIV AMER,DEPT PHYS,WASHINGTON,DC 20064, USA. NR 21 TC 4 Z9 4 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD JUN 1 PY 1991 VL 43 IS 16 BP 12701 EP 12706 DI 10.1103/PhysRevB.43.12701 PN A PG 6 WC Physics, Condensed Matter SC Physics GA FP631 UT WOS:A1991FP63100001 ER PT J AU VANVECHTEN, D WOOD, KS AF VANVECHTEN, D WOOD, KS TI PROBABILITY OF QUASI-PARTICLE SELF-TRAPPING DUE TO LOCALIZED ENERGY DEPOSITION IN NONEQUILIBRIUM TUNNEL-JUNCTION DETECTORS SO PHYSICAL REVIEW B LA English DT Article ID SUPERCONDUCTING LEAD AB Voltage-biased, superconducting tunnel junctions are investigated as x-ray detectors for applications requiring both high quantum efficiency and better than 1% energy resolution. The nonequilibrium quasiparticles, produced as the energy deposited degrades to the few-meV-per-excitation level, tunnel and are detected before they are lost to recombination. Previous event modeling ignored the energy cascade under the assumption that the equilibrium of the electrodes is minimally perturbed by the deposited energy. In this paper we demonstrate that that assumption is invalid. We calculate the local energy density as the average quasiparticle energy becomes of the proper magnitude to suppress the gap. The fraction of the nonequilibrium quasiparticles that become spatially trapped (never to tunnel) in the order-parameter well that their existence creates may vary between events. If so, the source of the observed non-Poisson-limited energy resolution of this class of detectors would be identified. The input parameters used were evaluated in equilibrium. Thus our conclusions need to be confirmed via a fully nonequilibrium calculation of the cascade. RP VANVECHTEN, D (reprint author), USN,RES LAB,CODE 4120,WASHINGTON,DC 20375, USA. NR 30 TC 39 Z9 39 U1 1 U2 1 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD JUN 1 PY 1991 VL 43 IS 16 BP 12852 EP 12860 DI 10.1103/PhysRevB.43.12852 PN A PG 9 WC Physics, Condensed Matter SC Physics GA FP631 UT WOS:A1991FP63100020 ER PT J AU GUHA, S PEEBLES, D WIETING, TJ AF GUHA, S PEEBLES, D WIETING, TJ TI ZONE-CENTER (Q = 0) OPTICAL PHONONS IN CUO STUDIED BY RAMAN AND INFRARED-SPECTROSCOPY SO PHYSICAL REVIEW B LA English DT Article ID CUPRIC OXIDE; SINGLE-CRYSTALS; NORMAL-MODES; SCATTERING; SUPERCONDUCTOR; YBA2CU3O7; SPECTRA AB We have conducted polarized Raman and infrared-reflectance measurements on CuO single crystals. Group theory predicts nine optical vibrations, of which three (A(g) + 2B(g)) are Raman active and six (3A(u) + 3B(u)) are infrared active. We have observed all nine frequencies. Infrared-reflectance spectra are modeled by a modified three-parameter dielectric-function method adapted to a monoclinic crystal. The nine optical zone-center (q = 0) frequencies are fitted by a lattice-dynamical model based on Wilson's FG matrix method. C1 USN,RES LAB,WASHINGTON,DC 20375. NR 25 TC 32 Z9 33 U1 0 U2 6 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD JUN 1 PY 1991 VL 43 IS 16 BP 13092 EP 13101 DI 10.1103/PhysRevB.43.13092 PN A PG 10 WC Physics, Condensed Matter SC Physics GA FP631 UT WOS:A1991FP63100050 ER PT J AU ROBSON, AE AF ROBSON, AE TI LOWER-HYBRID-DRIFT INSTABILITY AND RADIATIVE COLLAPSE OF A DENSE Z PINCH SO PHYSICS OF FLUIDS B-PLASMA PHYSICS LA English DT Article ID PLASMA; CONTRACTION; HYDROGEN; LOSSES; FIBER AB The increased resistivity resulting from the lower-hybrid-drift (LHD) instability is shown to increase the Pease-Braginskii current I(PB) in a Z pinch and to make radiative collapse harder to achieve; I(PB) becomes a function of both the line density and the pinch radius and a minimum dI/dt is necessary to induce collapse. The effect of the LHD instability is greatest in a hydrogen pinch, and decreases with increasing atomic number. RP ROBSON, AE (reprint author), USN,RES LAB,DIV PLASMA PHYS,WASHINGTON,DC 20375, USA. NR 28 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 0899-8221 J9 PHYS FLUIDS B-PLASMA PD JUN PY 1991 VL 3 IS 6 BP 1461 EP 1466 DI 10.1063/1.859712 PG 6 WC Physics, Fluids & Plasmas SC Physics GA FN765 UT WOS:A1991FN76500018 ER PT J AU PEYSER, TA MANKA, CK OBENSCHAIN, SP KEARNEY, KJ AF PEYSER, TA MANKA, CK OBENSCHAIN, SP KEARNEY, KJ TI REDUCTION OF 3-OMEGA-0/2 EMISSION FROM LASER-PRODUCED PLASMAS WITH BROAD BANDWIDTH, INDUCED SPATIAL INCOHERENCE AT 0.53-MU-M SO PHYSICS OF FLUIDS B-PLASMA PHYSICS LA English DT Article ID 2-PLASMON DECAY INSTABILITY; HARMONIC EMISSION; PARAMETRIC-INSTABILITY; UNIFORM ILLUMINATION; SMOOTHING TECHNIQUES; RAMAN-SCATTERING; LIGHT; BEAM; SUPPRESSION; SPECTRUM AB Measurements of the 3-omega-0/2 emission from laser-irradiated targets at 0.53-mu-m were made at three angles over a wide range of laser bandwidths with and without induced spatial incoherence (ISI) echelons. The 3-omega-0/2 emission was found to be correlated with hard x rays but not Raman spectra, suggesting that the 3-omega-0/2 radiation was due to two-plasmon decay. Reduction of both 3-omega-0/2 emission and the accompanying hard x rays by ISI required five to ten times larger bandwidths than needed to suppress stimulated Raman scattering and stimulated Brillouin scattering. C1 SCI APPLICAT INT CORP,MCLEAN,VA 22102. USN,RES LAB,DIV PLASMA PHYS,LASER PLASMA BRANCH,WASHINGTON,DC 20375. NR 35 TC 23 Z9 23 U1 0 U2 2 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0899-8221 J9 PHYS FLUIDS B-PLASMA PD JUN PY 1991 VL 3 IS 6 BP 1479 EP 1484 DI 10.1063/1.859715 PG 6 WC Physics, Fluids & Plasmas SC Physics GA FN765 UT WOS:A1991FN76500021 ER PT J AU KANIA, DR KRUER, WL BELL, P OBENSCHAIN, SP KEARNEY, K MOSTOVYCH, A AF KANIA, DR KRUER, WL BELL, P OBENSCHAIN, SP KEARNEY, K MOSTOVYCH, A TI INCREASED X-RAY CONVERSION EFFICIENCY FROM GOLD PLASMAS IRRADIATED WITH SPATIALLY AND TEMPORALLY INCOHERENT-LIGHT SO PHYSICS OF FLUIDS B-PLASMA PHYSICS LA English DT Article ID RAMAN-SCATTERING; MU-M; LASER; EMISSION; ILLUMINATION; RADIATION; TARGETS AB The efficiency with which 1.05-mu-m laser light is converted into x rays with energy less than 1.5 keV in high Z materials (gold) is increased by approximately 20% with the use of spatially and temporally incoherent light when compared to a nominal, high-powered laser beam with an identical average irradiance of 10(14) W/cm2. This effect is not a result of increased laser light absorption, laser bandwidth, nor reduced hot electron generation for the incoherent light, but is probably due to the change in the short scale length (approximately 100-mu-m) laser light intensity distribution in the target plane. The absolute levels of stimulated scattering and hot electron generation were small in all cases. Incoherent illumination reduced stimulated Brillouin scattering levels from 1.1% to 0.2% and, similarly, hot electron generation was decreased from 0.1% to 0.07%. C1 USN,RES LAB,WASHINGTON,DC 20375. RP KANIA, DR (reprint author), UNIV CALIF LAWRENCE LIVERMORE NATL LAB,L473,POB 5508,LIVERMORE,CA 94550, USA. NR 19 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 0899-8221 J9 PHYS FLUIDS B-PLASMA PD JUN PY 1991 VL 3 IS 6 BP 1496 EP 1500 DI 10.1063/1.859717 PG 5 WC Physics, Fluids & Plasmas SC Physics GA FN765 UT WOS:A1991FN76500023 ER PT J AU WIRTZ, JJ AF WIRTZ, JJ TI INTELLIGENCE TO PLEASE - THE ORDER OF BATTLE CONTROVERSY DURING THE VIETNAM-WAR SO POLITICAL SCIENCE QUARTERLY LA English DT Article RP WIRTZ, JJ (reprint author), NAVAL POST GRAD SCH,DEPT NATL SECUR AFFAIRS,MONTEREY,CA, USA. NR 25 TC 6 Z9 6 U1 0 U2 0 PU ACAD POLITICAL SCIENCE PI NEW YORK PA 475 RIVERSIDE DRIVE, SUITE 1274, NEW YORK, NY 10115-1274 SN 0032-3195 J9 POLIT SCI QUART JI Polit. Sci. Q. PD SUM PY 1991 VL 106 IS 2 BP 239 EP 263 DI 10.2307/2152228 PG 25 WC Political Science SC Government & Law GA FX030 UT WOS:A1991FX03000003 ER PT J AU ROLAND, CM AF ROLAND, CM TI HIGH-TEMPERATURE CRYSTALLIZATION OF POLY(ETHYLENE-TEREPHTHALATE) SO POLYMER ENGINEERING AND SCIENCE LA English DT Article ID X-RAY-DIFFRACTION; POLYETHYLENE TEREPHTHALATE; POLY(ETHYLENE-TEREPHTHALATE); FIBERS; CRYSTALLINITY; SCATTERING; POLYMERS; PRESSURE; EXTRUSION; BEHAVIOR AB Annealing poly(ethylene terephthalate) (PET) at high temperature results in a crystalline phase stable to 10-degrees-C higher than the temperature previously regarded as the equilibrium melting point. Melting temperatures as high as 289-degrees-C can be attained, which is equivalent to the equilibrium melting point determined herein for PET. The high melting point and tendency to superheat suggest that the crystals possess a substantial extended chain structure, notwithstanding the magnitude of the infrared fold band. RP ROLAND, CM (reprint author), USN,RES LAB,DIV CHEM,CODE 6120,WASHINGTON,DC 20375, USA. NR 56 TC 15 Z9 16 U1 0 U2 6 PU SOC PLASTICS ENG INC PI BROOKFIELD CENTER PA 14 FAIRFIELD DR, BROOKFIELD CENTER, CT 06804-0403 SN 0032-3888 J9 POLYM ENG SCI JI Polym. Eng. Sci. PD JUN PY 1991 VL 31 IS 12 BP 849 EP 854 DI 10.1002/pen.760311202 PG 6 WC Engineering, Chemical; Polymer Science SC Engineering; Polymer Science GA FU259 UT WOS:A1991FU25900001 ER PT J AU KARLE, IL FLIPPENANDERSON, JL AGARWALLA, S BALARAM, P AF KARLE, IL FLIPPENANDERSON, JL AGARWALLA, S BALARAM, P TI CRYSTAL-STRUCTURE OF [LEU1]ZERVAMICIN, A MEMBRANE ION-CHANNEL PEPTIDE - IMPLICATIONS FOR GATING MECHANISMS SO PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA LA English DT Article DE X-RAY DIFFRACTION; CHANNEL MOUTH; HELIX BENDING; POLYMORPHS; ALPHA-ALKYL AMINO ACIDS ID ALPHA-HELICES; AMINO-ACIDS; ALAMETHICIN; POLYPEPTIDES; AGGREGATION; ZERVAMICIN; PARALLEL; DESIGN; MODEL; OME AB Structures in four different crystal forms of [Leu1]zervamicin (zervamicin Z-L, Ac-Leu-Ile-Gln-Iva-Ile5-Thr-Aib-Leu-Aib-Hyp10-Gln-Aib-Hyp-Aib-Pro15-Phol, where Iva is isovaline, Aib is alpha-amino isobutyric acid, Hyp is 4-hydroxyproline, and Phol is phenylalaninol), a membrane channel-forming polypeptide from Emericellopsis salmosynnemata, have been determined by x-ray diffraction. The helical structure is amphiphilic with all the polar moieties on the convex side of the bent helix. Helices are bent at Hyp10 from almost-equal-to 30-degrees to almost-equal-to 45-degrees in the different crystal forms. In all crystal forms, the peptide helices aggregate in a similar fashion to form water channels that are interrupted by hydrogen bonds between N-epsilon-H(Gln11) and O-delta(Hyp10) of adjacent helices. The Gln11 side chain is folded in an unusual fashion in order to close the channel. Space is available for an extended conformation for Gln11, in which case the channel would be open, suggesting a gating mechanism for cation transport. Structural details are presented for one crystal form derived from methanol/water solution: C85H140N18O22.10H2O, space group P2(1), a = 23.068(6) angstrom, b = 9.162(3) angstrom, c = 26.727(9) angstrom, beta = 108.69(2)degrees (standard deviation of last digit is given in parentheses); overall agreement factor R = 10.1% for 5322 observed reflections [[F(o)[ > 3-sigma(F)]; resolution, 0.93 angstrom. C1 INDIAN INST SCI,MOLEC BIOPHYS UNIT,BANGALORE 560012,KARNATAKA,INDIA. RP KARLE, IL (reprint author), USN,RES LAB,STRUCT MATTER LAB,WASHINGTON,DC 20375, USA. FU NIGMS NIH HHS [GM 30902] NR 25 TC 122 Z9 122 U1 0 U2 3 PU NATL ACAD SCIENCES PI WASHINGTON PA 2101 CONSTITUTION AVE NW, WASHINGTON, DC 20418 SN 0027-8424 J9 P NATL ACAD SCI USA JI Proc. Natl. Acad. Sci. U. S. A. PD JUN PY 1991 VL 88 IS 12 BP 5307 EP 5311 DI 10.1073/pnas.88.12.5307 PG 5 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA FR448 UT WOS:A1991FR44800050 PM 1711227 ER PT J AU HICKMAN, GD HARDING, JM CARNES, M PRESSMAN, A KATTAWAR, GW FRY, ES AF HICKMAN, GD HARDING, JM CARNES, M PRESSMAN, A KATTAWAR, GW FRY, ES TI AIRCRAFT LASER SENSING OF SOUND-VELOCITY IN WATER - BRILLOUIN-SCATTERING SO REMOTE SENSING OF ENVIRONMENT LA English DT Article ID TEMPERATURE; OCEAN; SPEED AB A new real-time data source for sound speed in the upper 100 m has recently been proposed for exploratory development at the Naval Oceanographic and Atmospheric Research Laboratory. This data source would be generated via a ship- or aircraft-mounted, optical pulsed laser using the technique of spontaneous Brillouin scattering. This system should be capable (from a single 10 ns 500 mJ pulse) of yielding range resolved (almost-equal-to 1 m resolution) sound speed profiles in water to depths of 75-100 m to an accuracy of 1 m / s. At aircraft speeds of 300 miles / h (134 m / s) and a laser pulse repetition rate of 10 pps, vertical profiles of sound speed would be obtained spatially every 13 m. These 100 m profiles would provide the capability of rapidly monitoring the upper-ocean vertical structure for much of the world's oceans and for most seasons. They would provide new perspectives on upper-ocean mixing and the oceanic internal wave field. These profiles would also provide an extensive, new, subsurface-data source to existing real-time, operational ocean nowcast / forecast systems. The present systems are dependent on sparse bathythermograph data and information inferred from sea-surface data. Extension of the 100 m profiles to depth using existing and proposed techniques would further increase the value of the laser-derived information. C1 TEXAS A&M UNIV SYST,DEPT PHYS,COLLEGE STN,TX 77843. RP HICKMAN, GD (reprint author), USN,OCEANOG & ATMOSPHER RES LAB,STENNIS SPACE CTR,MS 39529, USA. RI Fry, Edward/B-6012-2016 NR 33 TC 53 Z9 59 U1 0 U2 5 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 1991 VL 36 IS 3 BP 165 EP 178 DI 10.1016/0034-4257(91)90054-A PG 14 WC Environmental Sciences; Remote Sensing; Imaging Science & Photographic Technology SC Environmental Sciences & Ecology; Remote Sensing; Imaging Science & Photographic Technology GA GA805 UT WOS:A1991GA80500002 ER PT J AU RHEE, MJ SCHNEIDER, RF AF RHEE, MJ SCHNEIDER, RF TI PHASE-SPACE MEASUREMENT OF A BEAM WITH A MAXWELLIAN TRANSVERSE VELOCITY DISTRIBUTION BY A FINITE-WIDTH SLIT SO REVIEW OF SCIENTIFIC INSTRUMENTS LA English DT Article ID EMITTANCE AB A numerical method is presented of finding the rms width and the height of a Maxwellian transverse velocity distribution from an experimentally obtained beamlet profile formed by a finite-width slit. The results are also least-squares fit to polynomials that can be very conveniently used in actual data analyses. C1 USN,CTR SURFACE WARF,SILVER SPRING,MD 20903. RP RHEE, MJ (reprint author), UNIV MARYLAND,PLASMA RES LAB,COLLEGE PK,MD 20742, USA. NR 7 TC 0 Z9 0 U1 0 U2 0 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0034-6748 J9 REV SCI INSTRUM JI Rev. Sci. Instrum. PD JUN PY 1991 VL 62 IS 6 BP 1468 EP 1470 DI 10.1063/1.1142469 PG 3 WC Instruments & Instrumentation; Physics, Applied SC Instruments & Instrumentation; Physics GA FP312 UT WOS:A1991FP31200015 ER PT J AU MATHEW, J GOLDEN, J AF MATHEW, J GOLDEN, J TI OUTPUT SWITCH FOR A MEGAVOLT ELECTRON-BEAM GENERATOR SO REVIEW OF SCIENTIFIC INSTRUMENTS LA English DT Article AB An improved gas output switch for a 12-OMEGA, 1.2 MV electron beam generator has been developed. The previous design used a cast epoxy switch housing with an embedded field shaper electrode. The original switch design was difficult to fabricate without defects in the casting, and several replacements failed during operation. The new design employs machined acrylic pieces instead of cast epoxy, and a glycol cavity surrounds the field shaper. Electric fields around the field shaper are therefore considerably lower. The present switch has demonstrated greater reliability and superior performance. C1 BERKELEY RES ASSOCIATES INC,SPRINGFIELD,VA 22151. RP MATHEW, J (reprint author), USN,RES LAB,DIV PLASMA PHYS,WASHINGTON,DC 20375, USA. NR 10 TC 0 Z9 1 U1 0 U2 0 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0034-6748 J9 REV SCI INSTRUM JI Rev. Sci. Instrum. PD JUN PY 1991 VL 62 IS 6 BP 1514 EP 1516 DI 10.1063/1.1142478 PG 3 WC Instruments & Instrumentation; Physics, Applied SC Instruments & Instrumentation; Physics GA FP312 UT WOS:A1991FP31200024 ER PT J AU ADAIR, D MADIGOSKY, WM MEASE, NE AF ADAIR, D MADIGOSKY, WM MEASE, NE TI AN ELECTROOPTICAL SENSOR FOR SURFACE DISPLACEMENT MEASUREMENTS OF COMPLIANT COATINGS SO REVIEW OF SCIENTIFIC INSTRUMENTS LA English DT Note AB Compliant coatings are now being used in many engineering applications, chiefly in relation to sound absorption and noise shielding. Another, though still controversial, application is their use in the reduction of skin friction drag of moving vessels. The design of a compliant coating to realize the latter goal or to achieve optimum sound absorption is complex and requires the determination of the surface motion characteristics resulting from the hydrodynamic forces [D. M. Bushnell, J. N. Hefner, and R. L. Ash, Phys. Fluids 20, 531 (1977)]. C1 USN,CTR SURFACE WARFARE,SILVER SPRING,MD 20903. NATL INST STAND & TECHNOL,GAITHERSBURG,MD 20899. RP ADAIR, D (reprint author), BMT FLUID MECH LTD,TEDDINGTON TW11 8LZ,MIDDX,ENGLAND. 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 0034-6748 J9 REV SCI INSTRUM JI Rev. Sci. Instrum. PD JUN PY 1991 VL 62 IS 6 BP 1652 EP 1653 DI 10.1063/1.1142450 PG 2 WC Instruments & Instrumentation; Physics, Applied SC Instruments & Instrumentation; Physics GA FP312 UT WOS:A1991FP31200049 ER PT J AU CHAWLA, KK ESMAEILI, AH DATYE, AK VASUDEVAN, AK AF CHAWLA, KK ESMAEILI, AH DATYE, AK VASUDEVAN, AK TI EFFECT OF HOMOGENEOUS HETEROGENEOUS PRECIPITATION ON AGING BEHAVIOR OF SICP/AL 2014 COMPOSITE SO SCRIPTA METALLURGICA ET MATERIALIA LA English DT Article ID DISLOCATION GENERATION; MATRIX COMPOSITES; FIBER C1 UNIV NEW MEXICO,ALBUQUERQUE,NM 87131. OFF NAVAL RES,ARLINGTON,VA 22217. RP CHAWLA, KK (reprint author), NEW MEXICO INST MIN & TECHNOL,SOCORRO,NM 87801, USA. OI Datye, Abhaya/0000-0002-7126-8659 NR 14 TC 71 Z9 71 U1 0 U2 1 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0956-716X J9 SCRIPTA METALL MATER JI Scr. Metall. Materialia PD JUN PY 1991 VL 25 IS 6 BP 1315 EP 1319 DI 10.1016/0956-716X(91)90407-R PG 5 WC Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Materials Science; Metallurgy & Metallurgical Engineering GA FP093 UT WOS:A1991FP09300016 ER PT J AU CROOKS, R KALU, PN MCNELLEY, TR AF CROOKS, R KALU, PN MCNELLEY, TR TI USE OF BACKSCATTERED ELECTRON IMAGING TO CHARACTERIZE MICROSTRUCTURES OF A SUPERPLASTIC AL-10MG-0.1ZR ALLOY SO SCRIPTA METALLURGICA ET MATERIALIA LA English DT Article ID AL-MG ALLOY; EVOLUTION RP CROOKS, R (reprint author), USN,POSTGRAD SCH,DEPT MECH ENGN,MONTEREY,CA 93943, USA. NR 11 TC 3 Z9 3 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 JUN PY 1991 VL 25 IS 6 BP 1321 EP 1325 DI 10.1016/0956-716X(91)90408-S PG 5 WC Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Materials Science; Metallurgy & Metallurgical Engineering GA FP093 UT WOS:A1991FP09300017 ER PT J AU DODD, N AF DODD, N TI REFLECTIVE PROPERTIES OF PARABOLIC APPROXIMATIONS IN SHALLOW-WATER WAVE-PROPAGATION SO SIAM JOURNAL ON APPLIED MATHEMATICS LA English DT Article DE PARABOLIC APPROXIMATIONS; REFLECTION; SHALLOW WATER ID EQUATION METHOD AB Two parabolic models for linear water wave propagation are investigated. These are then compared with the classical shallow water equations for two cases of wave propagation over a submerged step. The problem is reduced, by an appropriate choice of coordinates, to one that allows an analytic estimate of reflection coefficients to be made for each equation in each case. In this way, an estimate of the usefulness of each approximation in wave reflection-transmission problems is made. A method that extends the range of application of parabolic approximations in such cases is described, and results from it are presented. It is found that parabolic approximations may indeed model wave reflection satisfactorily at glancing angles to the step. RP DODD, N (reprint author), USN,POSTGRAD SCH,DEPT OCEANOG,MONTEREY,CA 93943, USA. NR 9 TC 2 Z9 2 U1 0 U2 1 PU SIAM PUBLICATIONS PI PHILADELPHIA PA 3600 UNIV CITY SCIENCE CENTER PH#382-9800, PHILADELPHIA, PA 19104-2688 SN 0036-1399 J9 SIAM J APPL MATH JI SIAM J. Appl. Math. PD JUN PY 1991 VL 51 IS 3 BP 635 EP 657 DI 10.1137/0151032 PG 23 WC Mathematics, Applied SC Mathematics GA FU251 UT WOS:A1991FU25100002 ER PT J AU KAHLER, SW KREPLIN, RW AF KAHLER, SW KREPLIN, RW TI THE NRL SOLRAD X-RAY-DETECTORS - A SUMMARY OF THE OBSERVATIONS AND A COMPARISON WITH THE SMS GOES DETECTORS SO SOLAR PHYSICS LA English DT Article ID SOLAR-FLARES; EMISSION; BURSTS AB The Naval Research Laboratory flew solar X-ray ionization chamber detectors on a series of Solar Radiation (SOLRAD) satellites from 1960 through 1979. The flare responses of the SOLRAD 11 detectors are compared with those of the similar NOAA SMS/GOES detectors during two periods of common observations. The nominal GOES fluxes exceed those of SOLRAD 11 by a factor of almost-equal-to 1.5-2 in the 0.5-4 angstrom band, but fall below those of SOLRAD by a factor of almost-equal-to 2-4 in the 1-8 angstrom band. Significant passband differences account for these relationships between the detector responses. Since the X-ray detectors are standardized among the various SOLRAD satellites, and all detectors are closely matched among the various SMS/GOES satellites, these conversion factors allow the SOLRAD flare observations to serve as proxies for GOES X-ray observations prior to the GOES era. We summarize the detector characteristics and data sources of the 0.5-3 angstrom and 1-8 angstrom detectors for the SOLRAD series. C1 BOSTON COLL,NEWTON,MA 02159. USN,RES LAB,WASHINGTON,DC 20375. RP KAHLER, SW (reprint author), EMMANUEL COLL,BOSTON,MA 02115, USA. NR 41 TC 24 Z9 24 U1 1 U2 1 PU KLUWER ACADEMIC PUBL PI DORDRECHT PA SPUIBOULEVARD 50, PO BOX 17, 3300 AA DORDRECHT, NETHERLANDS SN 0038-0938 J9 SOL PHYS JI Sol. Phys. PD JUN PY 1991 VL 133 IS 2 BP 371 EP 384 DI 10.1007/BF00149895 PG 14 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA FT666 UT WOS:A1991FT66600012 ER PT J AU DOUBT, TJ AF DOUBT, TJ TI PHYSIOLOGY OF EXERCISE IN THE COLD SO SPORTS MEDICINE LA English DT Review AB Recreational and job requirements have increased the incidence in which humans exercise in cold environments. Understanding the physiological responses while exposed to cold entails knowledge of how exercise and cold interact on metabolic, cardiopulmonary, muscle and thermal aspects of human performance. Where possible, distinctions are made between responses in cold air and cold water. While there is no consensus for diets most appropriate for working cold exposures, the evidence is strong that adequate amounts of carbohydrate are necessary. Carbohydrate loading appears to be efficacious, as it is for other athletic endeavours. Contrary to conventional wisdom, the combination of exercise and cold exposure does not act synergistically to enhance metabolism of fats. Free fatty acid (FFA) levels are not higher, and may be lower, with exercise in cold air or water when compared to corresponding warmer conditions. Glycerol, a good indicator of lipid mobilisation, is likewise reduced in the cold, suggesting impaired mobilisation from adipose tissue. Catecholamines, which promote lipolysis, are higher during exercise in cold air and water, indicating that the reduced lipid metabolism is not due to a lack of adequate hormonal stimulation. It is proposed that cold-induced vasoconstriction of peripheral adipose tissue may account, in part, for the decrease in lipid mobilisation. The respiratory exchange ratio (RER) is often similar for exercise conducted in warm and cold climates, suggesting FFA utilisation is equivalent between warm and cold exposures. The fractional portion of oxygen consumption (VO2) used for FFA combustion may decrease slightly during exercise in the cold. This decrease may be related to a relative decrease in oxygen delivery (i.e. muscle blood flow) or to impaired lipid mobilisation. Venous glucose is not substantially altered during exercise in the cold, but lactate levels are generally higher than with work in milder conditions. The time lag between production of lactate within the muscle and its release into the venous circulation may be increased by cold exposure. Minute ventilation is substantially increased upon initial exposure to cold, and a relative hyperventilation may persist throughout exercise. With prolonged exercise, though, ventilation may return to values comparable to exercise in warmer conditions. Exercise VO2 is generally higher in the cold, but the difference between warm and cold environments becomes less as workload increases. Increases in oxygen uptake may be due to persistence of shivering during exercise, to an increase in muscle tonus in the absence of overshivering, or to nonshivering thermogenesis. Heart rate is often, but not always, lower during exercise in the cold. The linear relationship between heart rate and oxygen consumption is displaced such that at a given rate oxygen uptake is higher. Cardiac arrhythmias are more frequent in the cold. Stroke volume tends to be higher than under warmer control conditions, but may decline sooner or at a rate equivalent to warm controls at heavy workloads. Cardiac output is similar to the same work done in temperature environments. Cold-induced vasoconstriction occurs both in cutaneous and resting skeletal muscle beds, but inactive muscle provides most of the passive body insulation. With exercise insulation provided by muscle decreases as blood flow increases. Relative to warmer conditions, muscle blood flow at a given workload may be reduced if deep muscle temperature is below normal (i.e. 39-degrees-C optimum). Respiratory heat loss is often assumed to represent 8% of the total metabolic heat production. However, during exercise this value will increase as minute ventilation increases. Loss of significant amounts of heat from the distal extremities can limit performance, even though the area is not directly involved with exercise. Cooled muscle has a decreased capacity to generate force expressed on cross-sectional area. As a consequence, it may be necessary to recruit more fast twitch motor units. Glycolysis is higher in cooled muscle, which may account for higher lactate levels and greater rates of muscle glycogen depletion. Brief intense exercise will not raise cooled muscle temperature to normal limits, but mild exercise can maintain normal temperatures if exercise begins before the muscles become cooled. Regional heat flux increases with exercise in the cold in direct proportion to the workload. Differing rates of heat loss can occur between active and inactive limbs, and individual rates are not constant throughout steady-state exercise. Peak rates of heat flux for inactive limbs occur during exercise, but peak flux for active limbs occurs in the postexercise period. At equal metabolic rates, more heat is lost with arm than with leg exercise. Most of the heat generated by exercising muscle is transferred convectively to the core via the venous circulation. The amount of heat lost conductively to the environment through tissue depends upon factors such as subcutaneous fat. Thus, individuals with higher levels of fat (e.g. skinfold thickness) generally are better able to maintain their core temperature cold environments. Steady-state exercise VO2 values of approximately 2.0 L/min have been shown to prevent falls in core temperature in water as low as 15-degrees-C. Warmer temperatures are required in order to maintain core homeostasis during intermittent exercise. Predicting an individual's response to exercise in the cold is quite difficult because of the interplay of many factors. Using existing data, responses to some forms of exercise and environmental stress can be estimated with reasonable accuracy. However, the number of these type responses is small compared to the total number of possible permutations, showing that much is yet to be learned. RP DOUBT, TJ (reprint author), USN,MED RES INST,HYPERBAR ENVIRONM ADAPTAT PROGRAM,BETHESDA,MD 20814, USA. NR 0 TC 43 Z9 44 U1 13 U2 57 PU ADIS INTERNATIONAL LTD PI AUCKLAND PA 41 CENTORIAN DR, PRIVATE BAG 65901, MAIRANGI BAY, AUCKLAND 10, NEW ZEALAND SN 0112-1642 J9 SPORTS MED JI Sports Med. PD JUN PY 1991 VL 11 IS 6 BP 367 EP 381 PG 15 WC Sport Sciences SC Sport Sciences GA FQ973 UT WOS:A1991FQ97300003 PM 1925184 ER PT J AU MALAFSKY, GP AF MALAFSKY, GP TI SUBMONOLAYER CLUSTER FORMATION AT THE GE/AL2O3(1102) INTERFACE SO SURFACE SCIENCE LA English DT Article ID SCANNING TUNNELING MICROSCOPY; GOLD CLUSTERS; LEVEL SHIFTS; SAPPHIRE; SURFACE; GROWTH; NUCLEATION; SILICON; GERMANIUM; EPITAXY AB The nucleation of clusters at the film-substrate interface is the first step in film growth. The three principal growth modes, layer growth, Stranski-Krastanov, and Volmer-Weber, describe growth kinetics which are different regimes of the competition between the surface kinetic processes of adsorption, diffusion, adatom capture by a cluster, and desorption. This study probes the growth of interfacial clusters during molecular beam epitaxy of Ge on Al2O3(1102BAR). X-ray photoelectron spectroscopy (XPS) is used to monitor the increase in cluster size at submonolayer surface coverages of Ge for growth temperatures of 300 and 900 K. Ge has two binding states, Ge-Ge and Ge-Al2O3, at all coverages for both temperatures. The Ge-Ge peak area reflects the concentration of surface clusters while the binding energy shift is related to the average coordination of the atoms within the cluster. Clusters form from the onset of deposition at coverages of 0.01-0.20 monolayers and increase in size rapidly with coverage, even at a growth temperature of 300 K. This low-coverage cluster formation is shown to be the product of the balance between the different surface kinetic processes. C1 USN,RES LAB,DIV ELECTR SCI & TECHNOL,WASHINGTON,DC 20375. NR 44 TC 3 Z9 3 U1 3 U2 5 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0039-6028 J9 SURF SCI JI Surf. Sci. PD JUN PY 1991 VL 249 IS 1-3 BP 159 EP 170 DI 10.1016/0039-6028(91)90841-F PG 12 WC Chemistry, Physical; Physics, Condensed Matter SC Chemistry; Physics GA FV267 UT WOS:A1991FV26700027 ER PT J AU MARTIN, JM AF MARTIN, JM TI STATE-SPACE MEASURES OF ROBUSTNESS OF POLE LOCATIONS FOR STRUCTURED AND UNSTRUCTURED PERTURBATIONS SO SYSTEMS & CONTROL LETTERS LA English DT Article DE ROBUSTNESS MEASURES; EIGENVALUE LOCATION; STRUCTURED PERTURBATIONS; RANK ONE PERTURBATIONS; OPERATOR NORMS ID PERTURBED COEFFICIENTS; STABILITY ROBUSTNESS; LINEAR-SYSTEMS; POLYNOMIALS; ASSIGNMENT; THEOREM AB Measures of pole location robustness for linear feedback systems are derived from a state space model of the system. The robustness tests ensure that the eigenvalues of the perturbed system matrix A + E remain in a desired region D of the complex plane containing the eigenvalues of the nominal system matrix A. The region D may be any open set of the complex plane whatsoever. The results are expressed in terms of induced matrix norms and apply to structured perturbations of the form E = B-DELTA-C, where B and C define the structure of E, and may be nonsquare matrices. Rank one perturbations E of minimal norm and with the given structure that will cause A + E to have an eigenvalue outside of D are constructed for the cases when the matrix norm is induced by the vector 1-norm or the vector infinity-norm. The advantages of having robustness measures for several matrix norms that can be computed are illustrated with a simple example that demonstrates how the conservatism of single tests can be reduced using several tests (i.e. several matrix norms). A method for computing numerically the robustness measures for particular norms is presented. It can be used to compute, with a guaranteed degree of accuracy, the maximum of the norm of the frequency response of a system. C1 USN,CTR WEAPONS,RES DEPT,APPL MATH RES GRP,CHINA LAKE,CA 93555. NR 21 TC 7 Z9 7 U1 0 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0167-6911 J9 SYST CONTROL LETT JI Syst. Control Lett. PD JUN PY 1991 VL 16 IS 6 BP 423 EP 433 DI 10.1016/0167-6911(91)90114-T PG 11 WC Automation & Control Systems; Operations Research & Management Science SC Automation & Control Systems; Operations Research & Management Science GA FU411 UT WOS:A1991FU41100004 ER PT J AU PEACE, DL AF PEACE, DL TI MAJOR MARITIME EVENTS IN THE PERSIAN GULF BETWEEN 1984 AND 1991 - A JURIDICAL ANALYSIS SO VIRGINIA JOURNAL OF INTERNATIONAL LAW LA English DT Article C1 USN,WASHINGTON,DC 20350. NR 64 TC 2 Z9 2 U1 0 U2 0 PU UNIV VIRGINIA PI CHARLOTTESVILLE PA SCHOOL LAW, CHARLOTTESVILLE, VA 22901 SN 0042-6571 J9 VA J INT LAW PD SUM PY 1991 VL 31 IS 4 BP 545 EP 566 PG 22 WC International Relations; Law SC International Relations; Government & Law GA GX244 UT WOS:A1991GX24400003 ER PT J AU ROACH, JA AF ROACH, JA TI MISSILES ON TARGET - TARGETING AND DEFENSE ZONES IN THE TANKER WAR SO VIRGINIA JOURNAL OF INTERNATIONAL LAW LA English DT Article C1 US DEPT STATE,USN,OFF LEGAL ADVISER,WASHINGTON,DC 20520. USN,COLL WAR,DIV INT LAW,OPERAT FACIL,NEWPORT,RI 02840. NR 7 TC 2 Z9 2 U1 0 U2 0 PU UNIV VIRGINIA PI CHARLOTTESVILLE PA SCHOOL LAW, CHARLOTTESVILLE, VA 22901 SN 0042-6571 J9 VA J INT LAW PD SUM PY 1991 VL 31 IS 4 BP 593 EP 610 PG 18 WC International Relations; Law SC International Relations; Government & Law GA GX244 UT WOS:A1991GX24400005 ER PT J AU MCNEILL, JH AF MCNEILL, JH TI NEUTRAL RIGHTS AND MARITIME SANCTIONS - THE EFFECTS OF 2 GULF WARS SO VIRGINIA JOURNAL OF INTERNATIONAL LAW LA English DT Article; Proceedings Paper CT MEETING OF THE LAW OF THE SEA COMMITTEE OF THE SECTION OF INTERNATIONAL LAW AND PRACTICE OF THE AMERICAN BAR ASSOC CY APR 26, 1991 CL WASHINGTON, DC SP AMER BAR ASSOC, SECT INT LAW & PRACTICE, LAW SEA COMM C1 USN,COLL WAR,WASHINGTON,DC 20350. NR 21 TC 0 Z9 0 U1 0 U2 0 PU UNIV VIRGINIA PI CHARLOTTESVILLE PA SCHOOL LAW, CHARLOTTESVILLE, VA 22901 SN 0042-6571 J9 VA J INT LAW PD SUM PY 1991 VL 31 IS 4 BP 631 EP 643 PG 13 WC International Relations; Law SC International Relations; Government & Law GA GX244 UT WOS:A1991GX24400008 ER PT J AU BILLMERS, RI SMITH, AL AF BILLMERS, RI SMITH, AL TI ULTRAVIOLET VISIBLE ABSORPTION-SPECTRA OF EQUILIBRIUM SULFUR VAPOR - MOLAR ABSORPTIVITY SPECTRA OF S-3 AND S-4 SO JOURNAL OF PHYSICAL CHEMISTRY LA English DT Article ID LIQUID-CHROMATOGRAPHY; COMPONENTS AB Ultraviolet-visible absorption spectra of equilibrium sulfur vapor were measured at various allotropic concentrations. This was achieved by using a two-temperature cell having sulful liquid in equilibrium with sulfur vapor. Independent variation of either temperature changes the vapor composition and, therefore, the absorption spectrum. Factor analysis techniques were applied to these vapor-phase mixtures to determine the identity and spectrum of each allotropic component. Our results show S3 and S4 to be two of the components which absorb in the spectral region between 350 and 600 nm. Quantitative, pure-component spectra of S3 and S4 were determined and used to calculate the partial pressures present in each mixture. DELTA-H-degrees(rxn) and DELTA-S-degrees(rxn) for the reaction 3S4 half-arrow-pointing-left-and-right 4S3 were determined to be 77.65 kJ/mol and 28.1 J/(mol K), respectively, at 810 K. C1 DREXEL UNIV, DEPT CHEM, PHILADELPHIA, PA 19104 USA. USN, CTR AIR DEV, WARMINSTER, PA 18974 USA. NR 20 TC 33 Z9 33 U1 1 U2 8 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0022-3654 J9 J PHYS CHEM-US JI J. Phys. Chem. PD MAY 30 PY 1991 VL 95 IS 11 BP 4242 EP 4245 DI 10.1021/j100164a015 PG 4 WC Chemistry, Physical SC Chemistry GA FP241 UT WOS:A1991FP24100015 ER PT J AU GRIM, SO SANGOKOYA, SA RHEINGOLD, AL MCFARLANE, W COLQUHOUN, IJ GILARDI, RD AF GRIM, SO SANGOKOYA, SA RHEINGOLD, AL MCFARLANE, W COLQUHOUN, IJ GILARDI, RD TI POLYDENTATE LIGANDS CONTAINING PHOSPHORUS .13. SYNTHESIS AND MOLECULAR-STRUCTURE OF (TRI-N-BUTYLPHOSPHINE)[TRIS(DIPHENYLTHIOPHOSPHINOYL)METHANIDO]SILVER(I), (N-BU)3PAG([(S)PPH2]3C) SO INORGANIC CHEMISTRY LA English DT Article ID NEGATIVE TRIDENTATE LIGAND; NUCLEAR MAGNETIC-RESONANCE; ANIONIC TRIPOD LIGANDS; SILVER(I) COMPLEXES; COORDINATION; TRIS(DIPHENYLTHIOPHOSPHINOYL)METHANIDE; PHOSPHINE; CRYSTAL; NMR; LIGATION AB The synthesis, NMR spectra, and molecular structure are described for (tri-n-butylphosphine)[tris(diphenylthiophosphinoyl)-methanido]silver(I). The compound crystallizes in monoclinic space group P21/c, with a = 18.192 (3) angstrom, b = 12.986 (2) angstrom, c = 21.194 (5) angstrom, beta = 109.42 (1)-degrees, and Z = 4. The molecule possesses pseudotetrahedral geometry about silver with the anionic ligand bonded via the three sulfur atoms in a tripodal, tridentate fashion with an average Ag-S bond length of 2.63 angstrom. The Ag-P (tri-n-butylphosphine) bond length is 2.402 (3) angstrom. The P-31 NMR spectrum at ambient temperature indicates 1J(Ag-107-P-31) and 1J(Ag-109-P-31) of 488.3 and 564.0 Hz, respectively, as well as 3J(P-31-P-31) of 7.3 Hz. C1 UNIV DELAWARE, DEPT CHEM, NEWARK, DE 19716 USA. CITY LONDON POLYTECH, DEPT CHEM, LONDON EC3N 2EY, ENGLAND. USN, RES LAB, WASHINGTON, DC 20375 USA. RP GRIM, SO (reprint author), UNIV MARYLAND, DEPT CHEM & BIOCHEM, COLLEGE PK, MD 20742 USA. NR 31 TC 24 Z9 24 U1 0 U2 3 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 29 PY 1991 VL 30 IS 11 BP 2519 EP 2522 DI 10.1021/ic00011a012 PG 4 WC Chemistry, Inorganic & Nuclear SC Chemistry GA FP146 UT WOS:A1991FP14600012 ER PT J AU GRUN, J STAMPER, J MANKA, C RESNICK, J BURRIS, R CRAWFORD, J RIPIN, BH AF GRUN, J STAMPER, J MANKA, C RESNICK, J BURRIS, R CRAWFORD, J RIPIN, BH TI INSTABILITY OF TAYLOR-SEDOV BLAST WAVES PROPAGATING THROUGH A UNIFORM GAS SO PHYSICAL REVIEW LETTERS LA English DT Article ID SELF-SIMILAR FLOW; STABILITY; SUPERNOVA; TARGETS; SHOCKS; PLANAR AB We present the first measurements of an instability in Taylor-Sedov blast waves propagating through a uniform gas. The instability occurred in a gas whose adiabatic index was low. Amplitude perturbations grew as a power of time. Our observations are compared to theory. RP GRUN, J (reprint author), USN,RES LAB,DIV PLASMA PHYS,SPACE PLASMA BRANCH,WASHINGTON,DC 20375, USA. NR 23 TC 137 Z9 138 U1 1 U2 7 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0031-9007 J9 PHYS REV LETT JI Phys. Rev. Lett. PD MAY 27 PY 1991 VL 66 IS 21 BP 2738 EP 2741 DI 10.1103/PhysRevLett.66.2738 PG 4 WC Physics, Multidisciplinary SC Physics GA FN046 UT WOS:A1991FN04600014 ER PT J AU GOLDBERG, L WELLER, JF MEHUYS, D WELCH, DF SCIFRES, DR AF GOLDBERG, L WELLER, JF MEHUYS, D WELCH, DF SCIFRES, DR TI 12-W BROAD AREA SEMICONDUCTOR AMPLIFIER WITH DIFFRACTION LIMITED OPTICAL OUTPUT SO ELECTRONICS LETTERS LA English DT Article DE AMPLIFIERS; SEMICONDUCTOR DEVICES; OPTICAL COMMUNICATION ID DIODE-ARRAY; LASER AB Broad area travelling wave GaAlAs SQW optical amplifiers have been fabricated and characterised. Using a 600-mu-m wide and 1000-mu-m long double pass amplifier, 12 W of peak pulsed output power was achieved with a 0.08-degrees wide diffraction limited far-field lobe. Small signal gain of 31 dB was measured in a 400-mu-m wide active area device. C1 SPECTRA DIODE LABS,SAN JOSE,CA 95134. RP GOLDBERG, L (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 5 TC 20 Z9 20 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 23 PY 1991 VL 27 IS 11 BP 927 EP 929 DI 10.1049/el:19910580 PG 3 WC Engineering, Electrical & Electronic SC Engineering GA FQ425 UT WOS:A1991FQ42500022 ER PT J AU SICA, LX AF SICA, LX TI METHOD FOR CALIBRATING HETERODYNE RECEIVER ARRAYS SO APPLIED OPTICS LA English DT Article RP SICA, LX (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 7 TC 2 Z9 2 U1 0 U2 2 PU OPTICAL SOC AMER PI WASHINGTON PA 2010 MASSACHUSETTS AVE NW, WASHINGTON, DC 20036 SN 0003-6935 J9 APPL OPTICS JI Appl. Optics PD MAY 20 PY 1991 VL 30 IS 15 BP 1886 EP 1888 PG 3 WC Optics SC Optics GA FN982 UT WOS:A1991FN98200002 PM 20700153 ER PT J AU HOWERTON, PH CORDRAY, DM AF HOWERTON, PH CORDRAY, DM TI DIODE PUMPING OF A SOLID-STATE LASER USING EVANESCENT FIELD FIBER OPTIC COUPLING - A PROPOSED TECHNIQUE SO APPLIED OPTICS LA English DT Article ID ND-YAG LASER; ARRAY; NEODYMIUM AB The use of optical fibers to evanescently couple pump energy from laser diodes to a solid state laser rod is proposed. This technique involves placing a series of optical fibers side-by-side around the barrel portion of a laser rod, parallel to the laser resonator mode. A large index difference between the core region of the optical fibers and the solid state material facilitates evanescent coupling of pump light into the laser rod. Efficient operation will be possible due to a high overlap between the laser resonating mode and the pumped volume. C1 USN,RES LAB,WASHINGTON,DC 20375. RP HOWERTON, PH (reprint author), SFA INC,LANDOVER,MD 20785, USA. NR 11 TC 2 Z9 3 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 20 PY 1991 VL 30 IS 15 BP 1911 EP 1915 PG 5 WC Optics SC Optics GA FN982 UT WOS:A1991FN98200007 PM 20700158 ER PT J AU FRIEBELE, EJ ASKINS, CG SHAW, CM GINGERICH, ME HARRINGTON, CC GRISCOM, DL TSAI, TE PAEK, UC SCHMIDT, WH AF FRIEBELE, EJ ASKINS, CG SHAW, CM GINGERICH, ME HARRINGTON, CC GRISCOM, DL TSAI, TE PAEK, UC SCHMIDT, WH TI CORRELATION OF SINGLE-MODE FIBER RADIATION RESPONSE AND FABRICATION PARAMETERS SO APPLIED OPTICS LA English DT Article DE FIBER FABRICATION; FIBER OPTICS; SINGLE-MODE FIBERS; RADIATION; ATTENUATION; STATISTICAL DESIGN OF EXPERIMENTS ID CORE OPTICAL FIBER; DEFECT CENTERS; WAVEGUIDES AB Statistically significant correlations have been established between certain fabrication parameters of matched clad, single-mode optical fiber waveguides and their response to an ionizing radiation dose of 2000 rad. The recovery data measured at -35-degrees-C following exposure have been fit to nth-order kinetic behavior where the adjustable parameters are the initial and permanent incremental losses (A(o) and A(f), respectively), the half-life of attenuation tau, and the order of kinetics n. The set of fibers chosen for analysis had Ge-doped silica cores. In fibers with Ge-F-doped silica clads, A(o) correlates with the concentration of Ge-doped into the fiber core; A(f) correlates with the ratio of oxygen to reagents used during core deposition; and tau and n correlate with a two-way interaction of core oxygen and fiber draw speed. In P-F-doped clad fibers, the P concentration has been found to correlate with the order of the kinetics of recovery. C1 AT&T BELL LABS,PRINCETON,NJ 08540. MICHIGAN STATE UNIV,E LANSING,MI 48824. GEOCENTERS INC,FT WASHINGTON,MD 20375. SFA INC,LANDOVER,MD 20785. RP FRIEBELE, EJ (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 26 TC 19 Z9 20 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 20 PY 1991 VL 30 IS 15 BP 1944 EP 1957 PG 14 WC Optics SC Optics GA FN982 UT WOS:A1991FN98200011 PM 20700162 ER PT J AU KAXIRAS, E AF KAXIRAS, E TI EFFECT OF SURFACE RECONSTRUCTION ON STABILITY AND REACTIVITY OF SI CLUSTERS - REPLY SO PHYSICAL REVIEW LETTERS LA English DT Letter C1 SACHS FREEMAN ASSOCIATES INC,LANDOVER,MD 20785. RP KAXIRAS, E (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 7 TC 3 Z9 3 U1 0 U2 1 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0031-9007 J9 PHYS REV LETT JI Phys. Rev. Lett. PD MAY 20 PY 1991 VL 66 IS 20 BP 2687 EP 2687 DI 10.1103/PhysRevLett.66.2687 PG 1 WC Physics, Multidisciplinary SC Physics GA FM036 UT WOS:A1991FM03600041 ER PT J AU STEMPLE, JZ RUSIN, KM FARE, TL AF STEMPLE, JZ RUSIN, KM FARE, TL TI ACTIVITY OF CHOLINE OXIDASE MONITORED INSITU WITH AN UNMODIFIED GLASSY-CARBON ELECTRODE SO ANALYTICAL CHEMISTRY LA English DT Letter ID IMMOBILIZED GLUCOSE-OXIDASE; ENZYME ELECTRODE C1 USN,RES LAB,CTR BIOMOLEC SCI & ENGN,WASHINGTON,DC 20375. NR 23 TC 16 Z9 16 U1 0 U2 1 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0003-2700 J9 ANAL CHEM JI Anal. Chem. PD MAY 15 PY 1991 VL 63 IS 10 BP 1050 EP 1052 DI 10.1021/ac00010a024 PG 3 WC Chemistry, Analytical SC Chemistry GA FL305 UT WOS:A1991FL30500026 ER PT J AU BRYANT, RD FREDRICKSEN, H AF BRYANT, RD FREDRICKSEN, H TI COVERING THE DEBRUIJN GRAPH SO DISCRETE MATHEMATICS LA English DT Article AB A subset S of maximally independent vertices from the de Bruijn graph B(n) is a cover of B(n) if every vertex of B(n) - S is adjacent to some vector of S. We find bounds on the size of a cover and algorithms and constructions to achieve those bounds. RP BRYANT, RD (reprint author), USN,RES CTR,MONTEREY,CA 93940, 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 0012-365X J9 DISCRETE MATH JI Discret. Math. PD MAY 15 PY 1991 VL 89 IS 2 BP 133 EP 148 DI 10.1016/0012-365X(91)90362-6 PG 16 WC Mathematics SC Mathematics GA FQ571 UT WOS:A1991FQ57100002 ER PT J AU HABERBERGER, RL YONUSHONIS, WP DAISE, RL MIKHAIL, IA ISHAK, EA AF HABERBERGER, RL YONUSHONIS, WP DAISE, RL MIKHAIL, IA ISHAK, EA TI REEXAMINATION OF RATTUS-NORVEGICUS AS AN ANIMAL-MODEL FOR AEROMONAS-ASSOCIATED ENTERITIS IN MAN SO EXPERIENTIA LA English DT Article; Proceedings Paper CT 3RD INTERNATIONAL WORKSHOP ON AEROMONAS AND PLESIOMONAS CY APR 05-06, 1990 CL HELSINGOR, DENMARK DE ANIMAL MODEL; AEROMONAS; CLINDAMYCIN; RAT ID CHILDHOOD GASTROENTERITIS; PLESIOMONAS-SHIGELLOIDES; HYDROPHILA; DIARRHEA; ENTEROPATHOGENICITY; PREVALENCE; THAILAND; STRAINS AB We have developed an oral feeding model for Aeromonas hydrophila enteritis using Rattus norvegicus with clindamycin pretreatment. All animals in the clindamycin group developed a self-limited, loose stool by day four of feeding. Intestinal examination revealed evidence of enteritis. Moreover, antibiotic usage may be a predisposing risk factor to infection. C1 UNIV CAIRO,FAC MED,CAIRO,EGYPT. RP HABERBERGER, RL (reprint author), USN,MED RES UNIT 3,DEPT RES SCI,FPO,NEW YORK,NY 09527, USA. NR 13 TC 4 Z9 4 U1 0 U2 0 PU BIRKHAUSER VERLAG AG PI BASEL PA PO BOX 133 KLOSTERBERG 23, CH-4010 BASEL, SWITZERLAND SN 0014-4754 J9 EXPERIENTIA JI Experientia PD MAY 15 PY 1991 VL 47 IS 5 BP 426 EP 429 PG 4 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA FP338 UT WOS:A1991FP33800012 PM 2044691 ER PT J AU SMITH, TJ GOLDEN, J KAPETANAKOS, CA AF SMITH, TJ GOLDEN, J KAPETANAKOS, CA TI STUDIES OF SYNCHROTRON RADIATION EMISSION FROM THE MODIFIED BETATRON ACCELERATOR SO JOURNAL OF APPLIED PHYSICS LA English DT Article ID ELECTRON RING; BEAM; CONFINEMENT; SPECTRUM; MIRROR AB Numerical calculations of synchrotron radiation emitted from the modified betatron accelerator show that, for relativistic electron energies up to approximately 2 MeV, the single-particle intensity spectrum is characterized by a peak at the Doppler-shifted cyclotron frequency associated with the applied toroidal field. As the electron energy is increased above a few MeV, the calculated spectrum becomes comparable to that of an electron in purely circular motion. Measurements of the radiation using fixed-frequency heterodyne receivers indicate that the polarization, amplitude, and the temporal evolution of radiated power during the first few hundred microseconds of acceleration are in good agreement with the predicted single-particle spectrum. These observations have been used to confirm the energy evolution and provide information about the magnitude of the transverse velocity of the beam electrons. Late-time signal decay suggests that electrons are moving off the minor axis in a manner that is consistent with the excitation of the electron-cyclotron resonance. RP SMITH, TJ (reprint author), USN,RES LAB,DIV PLASMA PHYS,WASHINGTON,DC 20375, USA. NR 28 TC 2 Z9 2 U1 0 U2 0 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0021-8979 J9 J APPL PHYS JI J. Appl. Phys. PD MAY 15 PY 1991 VL 69 IS 10 BP 6836 EP 6843 DI 10.1063/1.347673 PG 8 WC Physics, Applied SC Physics GA FM771 UT WOS:A1991FM77100009 ER PT J AU LEE, WM AF LEE, WM TI METAL WATER CHEMICAL-REACTION COUPLED TO A PULSED ELECTRICAL-DISCHARGE SO JOURNAL OF APPLIED PHYSICS LA English DT Article ID OPENING SWITCH; PRESSURE AB Capacitor-stored energy is transferred to a wire conductor surrounded by a mixture of a reactive metal powder and water. The overload current pulse quickly explodes the small wire conductor, initiating a chemical reaction in the mixture. The discharge after the explosion is made through a highly condensed state undergoing chemical reaction (producing both heat and hydrogen gas). In this type of discharge the heat and gas from the reaction help the reacting medium maintain some conductance necessary for effective dissipation of the electrical energy. The coupling of the discharge to the reaction is found to be crucial to sustain the reaction. RP LEE, WM (reprint author), USN,CTR SURFACE WARFARE,WHITE OAK LAB,SILVER SPRING,MD 20903, USA. NR 10 TC 8 Z9 13 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 15 PY 1991 VL 69 IS 10 BP 6945 EP 6951 DI 10.1063/1.348931 PG 7 WC Physics, Applied SC Physics GA FM771 UT WOS:A1991FM77100021 ER PT J AU THOMPSON, PE DAVIS, JL WATERMAN, J WAGNER, RJ GAMMON, D GASKILL, DK STAHLBUSH, R AF THOMPSON, PE DAVIS, JL WATERMAN, J WAGNER, RJ GAMMON, D GASKILL, DK STAHLBUSH, R TI USE OF ATOMIC LAYER EPITAXY BUFFER FOR THE GROWTH OF INSB ON GAAS BY MOLECULAR-BEAM EPITAXY SO JOURNAL OF APPLIED PHYSICS LA English DT Article ID MIGRATION-ENHANCED EPITAXY; SI; TEMPERATURE; INAS1-XSBX; FILMS; MBE AB A 300 angstrom buffer layer of InSb grown by atomic layer epitaxy at a substrate temperature of 300-degrees-C at the GaAs/InSb interface has been employed to grow epitaxial films of InSb having bulk-like properties. The reduction of the defects in the top InSb film has been observed with cross-sectional transmission electron microscopy and channeling Rutherford backscattering spectroscopy. The optimum substrate temperature for the primary InSb layer growth was 420-degrees-C with an atomic flux ratio of Sb to In of 1.4 and a growth rate of 1-mu-m/h. The best 5-mu-m-thick InSb layers had x-ray rocking curve widths of 100 s, 77 K n-type carrier concentrations in the low 10(15)/cm3 range, and 77 K carrier mobilities greater than 10(5) cm2/V s. Mesa isolated photodiodes had carrier lifetimes of 20 ns, in comparison to 200 ns observed in bulk InSb having a similar carrier concentration. An unexplained, weak free-electron spin resonance transition has been observed in these films. RP THOMPSON, PE (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 29 TC 50 Z9 50 U1 2 U2 9 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0021-8979 J9 J APPL PHYS JI J. Appl. Phys. PD MAY 15 PY 1991 VL 69 IS 10 BP 7166 EP 7172 DI 10.1063/1.347608 PG 7 WC Physics, Applied SC Physics GA FM771 UT WOS:A1991FM77100051 ER PT J AU DAVIDSON, KL BOYLE, PJ GAUTIER, C HANSON, HP KHALSA, SJS AF DAVIDSON, KL BOYLE, PJ GAUTIER, C HANSON, HP KHALSA, SJS TI MEDIUM-SCALE TO LARGE-SCALE ATMOSPHERIC VARIABILITY DURING THE FRONTAL AIR-SEA INTERACTION EXPERIMENT SO JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS LA English DT Article ID FLUX MEASUREMENTS; BOUNDARY-LAYER; TEMPERATURE; VICINITY AB Shipboard, aircraft, and satellite atmospheric data are examined to determine the representativeness of the Frontal Air-Sea Interaction Experiment (FASINEX) intensive measurement period, Phase II, in terms of climatology, atmospheric forcing, the general structure of the marine atmospheric boundary layer (MABL), and variability in boundary layer properties affecting air-ocean dynamics and thermodynamics. With regard to climatology, conditions observed during the intensive period were typical in terms of air-sea temperature differences, surface pressure patterns, cloud cover, and storm tracks. Storm system variabilities, such as the air temperature behind cold fronts, wind stress maxima occurring after frontal passage, the times for clockwise vector wind shifts associated with the frontal systems, and the systems' speeds, are estimated and emphasized in synoptic-scale characterization, since these can be related to observed ocean responses. The local ocean surface variability was observed to have an influence on regional boundary layer properties and on air-sea interaction parameters even in the presence of the atmospheric storms. C1 UNIV CALIF SANTA BARBARA,DEPT GEOG,SANTA BARBARA,CA 93106. COOPERAT INST RES ENVIRONM SCI,BOULDER,CO. RP DAVIDSON, KL (reprint author), USN,POSTGRAD SCH,DEPT METEOROL,MONTEREY,CA 93940, USA. RI KHalsa, Siri Jodha/A-9338-2009 OI KHalsa, Siri Jodha/0000-0001-9217-5550 NR 19 TC 11 Z9 11 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 1991 VL 96 IS C5 BP 8531 EP 8551 DI 10.1029/91JC00435 PG 21 WC Oceanography SC Oceanography GA FM099 UT WOS:A1991FM09900003 ER PT J AU HALLIWELL, GR CORNILLON, P BRINK, KH POLLARD, RT EVANS, DL REGIER, LA TOOLE, JM SCHMITT, RW AF HALLIWELL, GR CORNILLON, P BRINK, KH POLLARD, RT EVANS, DL REGIER, LA TOOLE, JM SCHMITT, RW TI DESCRIPTIVE OCEANOGRAPHY DURING THE FRONTAL AIR-SEA INTERACTION EXPERIMENT - MEDIUM-SCALE TO LARGE-SCALE VARIABILITY SO JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS LA English DT Article ID WESTERN NORTH-ATLANTIC; SUB-TROPICAL FRONT; SUBTROPICAL CONVERGENCE ZONE; DRIVEN CURRENT FLUCTUATIONS; UPPER OCEAN; SURFACE-TEMPERATURE; POTENTIAL-ENERGY; SST VARIABILITY; MIXED-LAYER; WIND STRESS AB Medium- and large-scale oceanographic variability in the Sargasso Sea is examined during the Frontal Air-Sea Interaction Experiment (FASINEX), focusing primarily on processes that influence the formation of subtropical fronts. From Fall to Spring the mean meridional gradient of meridional Ekman transport in the Subtropical Convergence Zone (STCZ) enhances the meridional sea surface temperature (T(s)) gradients between 26-degrees and 32-degrees-N. In the presence of this enhanced mean gradient, baroclinic eddies with zonal wavelengths of almost-equal-to 800 km and periods of almost-equal-to 200 days exert the dominant influence on the formation of subtropical fronts at medium and large scales. These eddies generate westward propagating T(s) anomaly features with the same dominant wavelengths and periods. They are confined between 26-degrees and 32-degrees-N and have amplitudes that occasionally exceed +/- 1-degrees-C. T(s) fronts tend to be found within bands almost-equal-to 200 km wide that roughly follow the periphery of these anomaly features. Deformation in the horizontal eddy current field is primarily responsible for the existence of these frontal bands. The migration of the strong front originally bracketed by the FASINEX moored array was related to the westward propagation of the larger-scale eddy/anomaly/frontal-band pattern. The moored array was located within a warm-anomaly feature during most of the experiment, which produced exceptionally warm conditions in the upper ocean. These anomalies are confined between 26-degrees and 32-degrees-N, not only because the relatively large seasonal mean T(sy) there allows horizontal eddy currents to force strong anomalies, but also because the baroclinic eddies with wavelengths of almost-equal-to 800 km and periods of almost-equal-to 200 days are confined to the STCZ. Large meridional variability exists in many properties of the eddy field, much of which can be traced to the influence of the Sargasso Sea mean current field on eddy variability. C1 UNIV RHODE ISL,GRAD SCH OCEANOG,NARRAGANSETT,RI 02882. WOODS HOLE OCEANOG INST,DEPT PHYS OCEANOG,WOODS HOLE,MA 02543. OFF NAVAL RES,PHYS OCEANOG PROGRAM,ARLINGTON,VA 22217. INST OCEANOG SCI,DEACON LAB,GODALMING GU8 5UB,SURREY,ENGLAND. UNIV CALIF SAN DIEGO,SCRIPPS INST OCEANOG,LA JOLLA,CA 92093. RP HALLIWELL, GR (reprint author), UNIV MIAMI,ROSENSTIEL SCH MARINE & ATMOSPHER SCI,DIV METEOROL & PHYS OCEANOG,MIAMI,FL 33149, USA. RI Schmitt, Raymond /B-7451-2011; Halliwell, George/B-3046-2011 OI Halliwell, George/0000-0003-4216-070X NR 58 TC 30 Z9 30 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 1991 VL 96 IS C5 BP 8553 EP 8567 DI 10.1029/91JC00100 PG 15 WC Oceanography SC Oceanography GA FM099 UT WOS:A1991FM09900004 ER PT J AU FRIEHE, CA SHAW, WJ ROGERS, DP DAVIDSON, KL LARGE, WG STAGE, SA CRESCENTI, GH KHALSA, SJS GREENHUT, GK LI, F AF FRIEHE, CA SHAW, WJ ROGERS, DP DAVIDSON, KL LARGE, WG STAGE, SA CRESCENTI, GH KHALSA, SJS GREENHUT, GK LI, F TI AIR-SEA FLUXES AND SURFACE-LAYER TURBULENCE AROUND A SEA-SURFACE TEMPERATURE FRONT SO JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS LA English DT Article ID CONVECTIVE BOUNDARY-LAYER; SIMULATIONS; DEPENDENCE; AIRCRAFT; FIELD AB The response of the lower marine atmospheric boundary layer to sharp changes in sea surface temperature was studied in the Frontal Air-Sea Interaction Experiment (FASINEX) with aircraft and ships measuring mean and turbulence quantities, sea surface temperature, and wave state. Changing synoptic weather on 3 successive days provided cases of wind direction both approximately parallel and perpendicular to a surface temperature front. For the wind perpendicular to the front, both wind over cold-to-warm and warm-to-cold surface temperatures occurred. For the cold-to-warm case, the unstable boundary layer was observed to thicken, with increased convective activity on the warm side. For the warm-to-cold case, the surface layer buoyant stability changed from unstable to neutral or slightly stable, and the sea state and turbulence structure in the lower 100 m were immediately altered, with a large decrease in stress and slowing of the wind. Measurements for this case with two aircraft in formation at 30 and 100 m show a slightly increased stress divergence on the cold side. The turbulent velocity variances changed anisotropically across the front: the streamwise variance was practically unchanged, whereas the vertical and cross-stream variances decreased. Model results, consistent with the observations, suggest that an internal boundary layer forms at the sea surface temperature front. The ocean wave, swell, and microwave radar backscatter fields were measured from several aircraft which flew simultaneously with the low-level turbulence aircraft. Significant reductions in backscatter and wave height were observed on the cold side of the front. C1 USN,POSTGRAD SCH,DEPT METEOROL,MONTEREY,CA 93940. UNIV CALIF SAN DIEGO,SCRIPPS INST OCEANOG,LA JOLLA,CA 92093. NATL CTR ATMOSPHER RES,BOULDER,CO 80307. FLORIDA STATE UNIV,DEPT METEOROL,TALLAHASSEE,FL 32306. WOODS HOLE OCEANOG INST,WOODS HOLE,MA 02543. UNIV COLORADO,NOAA,COOPERAT INST RES ENVIRONM SCI,BOULDER,CO 80309. NOAA,ENVIRONM RES LAB,BOULDER,CO 80303. CALTECH,JET PROP LAB,PASADENA,CA 91109. RP FRIEHE, CA (reprint author), UNIV CALIF IRVINE,DEPT MECH ENGN,IRVINE,CA 92717, USA. RI KHalsa, Siri Jodha/A-9338-2009 OI KHalsa, Siri Jodha/0000-0001-9217-5550 NR 33 TC 124 Z9 125 U1 0 U2 5 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 1991 VL 96 IS C5 BP 8593 EP 8609 DI 10.1029/90JC02062 PG 17 WC Oceanography SC Oceanography GA FM099 UT WOS:A1991FM09900006 ER PT J AU DETSCH, RM AF DETSCH, RM TI SMALL AIR BUBBLES IN REAGENT GRADE WATER AND SEAWATER .1. RISE VELOCITIES OF 20-MU-M-DIAMETER TO 1000-MU-M-DIAMETER BUBBLES SO JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS LA English DT Article AB The terminal rise velocities of 20- to 1000-mu-m-diameter air bubbles in water and seawater were measured at atmospheric pressure and room temperature. The velocities were the same in both liquids for bubbles with diameters less than 450-mu-m. Above 450-mu-m the rise velocities were higher in water than in seawater. For all diameters tested, the measured velocities fell between those expected for bubbles with "frozen" surfaces and those expected for bubbles with fluid surfaces which exhibit internal circulation. RP DETSCH, RM (reprint author), USN,CTR COASTAL SYST,PANAMA CITY,FL 32401, USA. NR 8 TC 20 Z9 21 U1 0 U2 5 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 1991 VL 96 IS C5 BP 8901 EP 8906 DI 10.1029/91JC00484 PG 6 WC Oceanography SC Oceanography GA FM099 UT WOS:A1991FM09900029 ER PT J AU HARRIS, IA DETSCH, RM AF HARRIS, IA DETSCH, RM TI SMALL AIR BUBBLES IN REAGENT GRADE WATER AND SEAWATER .2. DISSOLUTION OF 20-MU-M-DIAMETER TO 500-MU-M-DIAMETER BUBBLES AT ATMOSPHERIC-PRESSURE SO JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS LA English DT Article AB The dissolution rates for 20- to 500-mu-m-diameter air bubbles in water and seawater at 50% and 100% air saturation are presented. The data indicate a dissolution rate that is independent of diameter for bubbles larger than approximately 70-mu-m but is strongly dependent on diameter for smaller bubbles. Rise velocity data from a companion study were used in conjunction with Levich's "dirty bubble" formula to predict dissolution rates for the bubbles. There is good agreement with theory for bubbles in saturated liquids and for bubbles with diameters larger than 70-mu-m. Agreement is fair for smaller bubbles in 50% saturated water and seawater. RP HARRIS, IA (reprint author), USN,CTR COASTAL SYST,PANAMA CITY,FL 32401, USA. NR 6 TC 6 Z9 6 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 1991 VL 96 IS C5 BP 8907 EP 8910 DI 10.1029/91JC00485 PG 4 WC Oceanography SC Oceanography GA FM099 UT WOS:A1991FM09900030 ER PT J AU BASHKANSKY, M REINTJES, J AF BASHKANSKY, M REINTJES, J TI CORRELATION-EFFECTS IN PUMP-DEPLETED BROAD-BAND STIMULATED RAMAN AMPLIFICATION SO OPTICS COMMUNICATIONS LA English DT Article ID GAIN ENHANCEMENT AB We report gain depletion measurements in broadband stimulated Raman amplification of collinear and crossed beams in hydrogen as a function of correlation between pump and Stokes. Pump depletion varies from 40% for uncorrelated beams to 80% for correlated beams. The width of the correlation peak in the gain is larger in the depleted regime than in the non-depleted regime, but in both cases it is of the order of the inverse laser bandwidth. Pump depletion is lower for crossed beams due to the decrease in the interaction length, but no effect on the correlation peak shape is observed. RP BASHKANSKY, M (reprint author), USN,RES LAB,DIV OPT SCI,LASER PHYS BRANCH,CODE 6540,WASHINGTON,DC 20375, USA. NR 8 TC 9 Z9 9 U1 0 U2 2 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0030-4018 J9 OPT COMMUN JI Opt. Commun. PD MAY 15 PY 1991 VL 83 IS 1-2 BP 103 EP 107 DI 10.1016/0030-4018(91)90530-Q PG 5 WC Optics SC Optics GA FQ063 UT WOS:A1991FQ06300020 ER PT J AU RABINOVICH, WS FELDMAN, BJ AF RABINOVICH, WS FELDMAN, BJ TI PHOTOREFRACTIVE 2-BEAM COUPLING WITH WHITE-LIGHT SO OPTICS LETTERS LA English DT Article ID HOLOGRAPHY AB We demonstrate, for the first time to our knowledge, two-beam coupling in BaTiO3 using white light. An achromatic grating arrangement in conjunction with a high-pressure mercury-arc lamp is used to produce the white-light fringes. The sensitivity of the coupling to source coherence, crystal orientation, and grating spacing is determined, and a comparison with two-beam coupling with monochromatic light at the same intensity is made. RP RABINOVICH, WS (reprint author), USN,RES LAB,LASER PHYS BRANCH,WASHINGTON,DC 20375, USA. NR 11 TC 8 Z9 8 U1 0 U2 1 PU OPTICAL SOC AMER PI WASHINGTON PA 2010 MASSACHUSETTS AVE NW, WASHINGTON, DC 20036 SN 0146-9592 J9 OPT LETT JI Opt. Lett. PD MAY 15 PY 1991 VL 16 IS 10 BP 708 EP 710 DI 10.1364/OL.16.000708 PG 3 WC Optics SC Optics GA FK894 UT WOS:A1991FK89400004 PM 19774045 ER PT J AU LI, Y HA, B EICHMANN, G KANTERAKIS, EG CAVIRIS, NP AF LI, Y HA, B EICHMANN, G KANTERAKIS, EG CAVIRIS, NP TI DETECTION OF MULTIPATH EFFECT USING A SELF-PUMPED OPTICAL PHASE-CONJUGATE FILTER SO OPTICS LETTERS LA English DT Article ID INTERFEROMETER; MIRRORS AB A new optical Fourier domain filtering scheme that combines the conventional optical space-invariant linear filtering with a self-pumped nonlinear-optical phase-conjugation technique is proposed. The new method is used for a real-time detection and channel evaluation of the multipath information needed in radar, sonar, and communication signal-processing applications. Preliminary experimental demonstrations are included. C1 SCS TELECOM INC,PORT WASHINGTON,NY 11050. USN,CTR SURFACE WEAP,SILVER SPRING,MD 20910. RP LI, Y (reprint author), CUNY CITY COLL,DEPT ELECT ENGN,NEW YORK,NY 10031, USA. NR 16 TC 2 Z9 2 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 MAY 15 PY 1991 VL 16 IS 10 BP 741 EP 743 DI 10.1364/OL.16.000741 PG 3 WC Optics SC Optics GA FK894 UT WOS:A1991FK89400015 PM 19774056 ER PT J AU PASSAMANTE, A FARRELL, ME AF PASSAMANTE, A FARRELL, ME TI CHARACTERIZING ATTRACTORS USING LOCAL INTRINSIC DIMENSION VIA HIGHER-ORDER STATISTICS SO PHYSICAL REVIEW A LA English DT Article ID STRANGE ATTRACTORS; GENERALIZED DIMENSIONS; CHAOTIC ATTRACTORS; FRACTAL DIMENSION AB Often it is required to make dimension estimates on data corrupted with moderate amounts of additive noise. The dimension of interest in this paper is the local intrinsic dimension of the attractor in the phase space. In this work we present a technique to estimate the local intrinsic dimension using higher-order statistical information, in particular, using statistical information beyond what is contained in methods based on the covariance. The average higher-order local intrinsic dimension (< d(H) >) is calculated from noisy data, the additive noise of which may be correlated and nonwhite in nature. With use of noisy data samples, the higher-order local intrinsic dimension (HOLID) is calculated from analysis of a higher-order cumulant matrix formed within local attractor regions. The local rank of the HOLID matrix is computed using the method of singular-value decomposition and the singular values so formed are then separated into signal components and noise components by applying a direct threshold. The local rank is an integer that varies with position on the attractor. To obtain < d(H) > an average of the available local HOLID's is calculated. Results of the < d(H) > compare favorably with those of the covariance formulation < d(C) > for finding the local intrinsic dimension. Also presented, for comparison purposes, with these results are the correlation dimension for some known chaotic cases since they are so widely used. Tests performed with different signal and noise types and at various signal-to-noise ratios have indicated that < d(H) > can yield more accurate dimension information in the presence of correlated noise, but more data samples must be processed. RP PASSAMANTE, A (reprint author), USN,CTR AIR DEV,WARMINSTER,PA 18974, USA. NR 20 TC 4 Z9 5 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 1991 VL 43 IS 10 BP 5268 EP 5274 DI 10.1103/PhysRevA.43.5268 PG 7 WC Optics; Physics, Atomic, Molecular & Chemical SC Optics; Physics GA FN053 UT WOS:A1991FN05300009 ER PT J AU SINGH, DJ PICKETT, WE KRAKAUER, H AF SINGH, DJ PICKETT, WE KRAKAUER, H TI GRADIENT-CORRECTED DENSITY FUNCTIONALS - FULL-POTENTIAL CALCULATIONS FOR IRON SO PHYSICAL REVIEW B LA English DT Article ID GROUND-STATE PROPERTIES; INHOMOGENEOUS ELECTRON-GAS; CORRELATION-ENERGY; BRILLOUIN-ZONE; CHARGE-DENSITIES; SPECIAL POINTS; EXCHANGE; APPROXIMATION; METALS; FERROMAGNETISM AB Full-potential calculations of the electronic structure and ground-state properties of iron using the Langreth-Mehl-Hu, Perdew-Wang, and Becke gradient-corrected local-density functionals are reported. As in earlier linear-muffin-tin-orbital calculations using the atomic-spheres approximation, a ferromagnetic bcc ground state is found, although there are differences in the energetics. The effect of the gradient corrections on the electronic structure is discussed in detail. It is found that there are significant changes in the exchange splittings that result from nonspherical terms in the potential, and these differ significantly depending on the choice of the gradient correction. C1 COLL WILLIAM & MARY,DEPT PHYS,WILLIAMSBURG,VA 23185. RP SINGH, DJ (reprint author), USN,RES LAB,COMPLEX SYST THEORY BRANCH,WASHINGTON,DC 20375, USA. RI Singh, David/I-2416-2012; OI Krakauer, Henry/0000-0003-2517-0957 NR 55 TC 181 Z9 181 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 MAY 15 PY 1991 VL 43 IS 14 BP 11628 EP 11634 DI 10.1103/PhysRevB.43.11628 PG 7 WC Physics, Condensed Matter SC Physics GA FM463 UT WOS:A1991FM46300008 ER PT J AU KHAN, FS BROUGHTON, JQ AF KHAN, FS BROUGHTON, JQ TI RELAXATION OF ICOSAHEDRAL-CAGE SILICON CLUSTERS VIA TIGHT-BINDING MOLECULAR-DYNAMICS SO PHYSICAL REVIEW B LA English DT Article ID ELECTRONIC-STRUCTURE; C-60; SURFACES; STABILITY; SI AB We have used a tight-binding total-energy expression for silicon to study the stability and structure of relatively large silicon clusters. Relaxation is performed using a fictitious Lagrangian and molecular dynamics. Specifically, we have looked at the relaxation of 50-, 60-, and 70-atom spheroidal hollow (icosahedral-cage-structure) clusters. We find that these clusters are not stable and relax into structures which look like puckered balls. Our results show that the unrelaxed clusters are metallic and the relaxed clusters are insulating with the Fermi level passing between localized states. We have also examined the relaxation of large clusters (size of about 100 atoms) extracted from pure diamond, fcc, and sc bulk silicon. We find that the cohesive energies of the relaxed icosahedral-cage clusters are greater than the relaxed diamond clusters and less than the relaxed fcc clusters. We also find that a single layer of flat silicon graphite is not stable and relaxes into a nonplanar layer with properties very similar to those of the relaxed icosahedral clusters. C1 BROOKHAVEN NATL LAB,DEPT PHYS,UPTON,NY 11973. USN,RES LAB,COMPLEX SYST THEORY GRP,WASHINGTON,DC 20375. RP KHAN, FS (reprint author), OHIO STATE UNIV,DEPT ELECT ENGN,COLUMBUS,OH 43210, USA. NR 23 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 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD MAY 15 PY 1991 VL 43 IS 14 BP 11754 EP 11761 DI 10.1103/PhysRevB.43.11754 PG 8 WC Physics, Condensed Matter SC Physics GA FM463 UT WOS:A1991FM46300023 ER PT J AU TIERSTEN, SC REINECKE, TL YING, SC AF TIERSTEN, SC REINECKE, TL YING, SC TI PHONON-MEDIATED INDIRECT INTERACTIONS BETWEEN ADATOMS ON SURFACES - O ADATOMS ON SI(100) SO PHYSICAL REVIEW B LA English DT Note ID SILICON SURFACES; OXYGEN; CHEMISORPTION; MODEL AB In an earlier paper, we presented a general treatment of the phonon-mediated interactions between adatoms on surfaces, based on a lattice-dynamics approach. There the interaction was expressed in terms of the vibrational correlation functions of the surface and the interactions of the adatom with the rigid surface. In the present paper, we give the results of model calculations for the interactions between O adatoms on the dimer sites of the Si(100) surface. The approach developed earlier for the vibrational properties of the Si(100) surface is used, and a model for the interactions of the O adatoms with the surface is obtained on the basis of recent total-energy results. C1 USN,RES LAB,WASHINGTON,DC 20375. BROWN UNIV,DEPT PHYS,PROVIDENCE,RI 02912. NR 19 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 1991 VL 43 IS 14 BP 12045 EP 12048 DI 10.1103/PhysRevB.43.12045 PG 4 WC Physics, Condensed Matter SC Physics GA FM463 UT WOS:A1991FM46300062 ER PT J AU REINECKE, TL YING, SC AF REINECKE, TL YING, SC TI VIBRATIONAL PROPERTIES OF THE CLEAN RECONSTRUCTED W(100) SURFACE SO PHYSICAL REVIEW B LA English DT Article ID W(001) SURFACE; W 001; ENERGY; SPECTROSCOPY; INSTABILITY; SCATTERING; RELAXATION; TRANSITION; DISTORTION; PHONONS AB A force-constant model for the dynamical matrix of the (square-root 2 X square-root 2)R 45-degrees W(100) clean reconstructed surface has been constructed, based on all existing total-energy results for this surface. Such results are available for five distortions around the reconstructed geometry. The dynamical matrix is used to study the vibrational properties of the surface, including the surface modes and their dispersions the vibrational correlation functions, and the mean squared displacements. The surface is found to exhibit a number of characteristic modes and resonances. These include three strong surface features whose polarizations are mainly perpendicular to one another and which are folded back upon reconstruction, and also a subsurface mode above the bulk bands. The qualitative features of many of these modes and resonances can be understood on the basis of simple, qualitative properties of this surface (such as zone folding), but the values of the frequencies and the dispersions depend on details of the surface force constants. The total-energy results are found to constrain strongly the frequencies and dispersions of the surface modes. The surface mean squared displacements and correlation functions exhibit interesting anisotropies, which are related to the surface modes. The dependence of the surface mode frequencies and eigenvectors on the force constants is described, and the implications of the present results for electron-energy-loss spectroscopy and He-atom scattering are discussed. C1 BROWN UNIV,DEPT PHYS,PROVIDENCE,RI 02912. RP REINECKE, TL (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 36 TC 6 Z9 6 U1 0 U2 2 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD MAY 15 PY 1991 VL 43 IS 15 BP 12234 EP 12245 DI 10.1103/PhysRevB.43.12234 PG 12 WC Physics, Condensed Matter SC Physics GA FM823 UT WOS:A1991FM82300008 ER PT J AU RYAN, JC AF RYAN, JC TI COLLECTIVE INTERACTIONS IN A QUANTUM-WELL - THE INCLUSION OF NONLOCAL EXCHANGE SO PHYSICAL REVIEW B LA English DT Article ID ELECTRON-GAS; LIGHT-SCATTERING AB We present a variational scheme for calculating the irreducible polarizability of an electron system and apply this method to the exchange interaction in a single quantum well. The collective spin-density and intersubband plasmon energies are derived and evaluated numerically in an infinite-square-well approximation. These results are compared with experiments as well as with the previous theoretical results based upon the local-density approximation. RP RYAN, JC (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 14 TC 31 Z9 31 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 1991 VL 43 IS 15 BP 12406 EP 12412 DI 10.1103/PhysRevB.43.12406 PG 7 WC Physics, Condensed Matter SC Physics GA FM823 UT WOS:A1991FM82300026 ER PT J AU CARLOS, WE BISHOP, SG TREACY, DJ AF CARLOS, WE BISHOP, SG TREACY, DJ TI NMR-STUDIES OF STRAIN IN ISOVALENTLY DOPED GAAS SO PHYSICAL REVIEW B LA English DT Article AB The deviations from tetrahedral symmetry induced by indium substituting for gallium in GaAs are probed by using nuclear magnetic resonance (NMR) to study the first- and second-order nuclear quadrupole interactions of the arsenic and indium atoms. The indium atoms are found to be randomly distributed on the gallium sublattice. The strain field is sufficient to affect the NMR of either the In or the As nuclei at distances of about 30 angstrom from an In atom. Second-order nuclear quadrupole interactions in the As NMR are used to determine specific bond-angle distortions for the first shells of atoms around an In atom. C1 USN ACAD,ANNAPOLIS,MD 21402. RP CARLOS, WE (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 19 TC 13 Z9 13 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 MAY 15 PY 1991 VL 43 IS 15 BP 12512 EP 12521 DI 10.1103/PhysRevB.43.12512 PG 10 WC Physics, Condensed Matter SC Physics GA FM823 UT WOS:A1991FM82300040 ER PT J AU CLARK, SE JONES, LR DESANDRE, LF AF CLARK, SE JONES, LR DESANDRE, LF TI COHERENT ARRAY OPTICAL IMAGING SO APPLIED OPTICS LA English DT Article AB This paper describes a technique that allows a severely distorted coherent optical array receiver to produce images comparable to conventional monolithic imaging systems. The technique is based on using a phase synchronizing point source as a reference to eliminate phase errors in the array. Once phase corrected, the individual elements in the array can be coherently combined to yield a resolution equal to the overall size of the array, and if Doppler information is available, separation of targets within the diffraction limited spot size of the array is possible. Experimental verification of concepts developed within this paper is presented for array receivers operating at 633 and 514 nm. C1 USN,CTR WEAP,CHINA LAKE,CA 93555. RP CLARK, SE (reprint author), LOUGHBOROUGH UNIV TECHNOL,DEPT PHYS,LOUGHBOROUGH LE11 3TU,LEICS,ENGLAND. NR 6 TC 2 Z9 2 U1 1 U2 2 PU OPTICAL SOC AMER PI WASHINGTON PA 2010 MASSACHUSETTS AVE NW, WASHINGTON, DC 20036 SN 0003-6935 J9 APPL OPTICS JI Appl. Optics PD MAY 10 PY 1991 VL 30 IS 14 BP 1804 EP 1810 PG 7 WC Optics SC Optics GA FM764 UT WOS:A1991FM76400007 PM 20700362 ER PT J AU QUIRRENBACH, A WITZEL, A WAGNER, S SANCHEZPONS, F KRICHBAUM, TP WEGNER, R ANTON, K ERKENS, U HAEHNELT, M ZENSUS, JA JOHNSTON, KJ AF QUIRRENBACH, A WITZEL, A WAGNER, S SANCHEZPONS, F KRICHBAUM, TP WEGNER, R ANTON, K ERKENS, U HAEHNELT, M ZENSUS, JA JOHNSTON, KJ TI CORRELATED RADIO AND OPTICAL VARIABILITY IN THE BL LACERTAE OBJECT 0716+714 SO ASTROPHYSICAL JOURNAL LA English DT Article DE BL LACERTAE OBJECTS; GALAXIES, JETS; GALAXIES, NUCLEI; QUASARS; RADIO SOURCES, VARIABLE ID RAPID VARIABILITY AB We present results from simultaneous optical and radio observations of the BL Lacertae object 0716 + 714. During a 4 week period of continuous monitoring the source displayed in both wavelength regimes a transition between states of fast and slow variability with a change of the typical variability time scale from approximately 1 day to approximately 7 days. We interpret the simultaneous transition as evidence for intrinsic source variability, and we discuss some consequences for the optical and radio emission regions. C1 LANDESSTERNWARTE HEIDELBERG,W-6900 HEIDELBERG 1,GERMANY. USN,RES LAB,CTR ADV SPACE SENSING,WASHINGTON,DC 20375. MAX PLANCK INST RADIOASTRON,W-5300 BONN 1,GERMANY. NATL RADIO ASTRON OBSERV,SOCORRO,NM 87801. NR 19 TC 98 Z9 99 U1 2 U2 2 PU UNIV CHICAGO PRESS PI CHICAGO PA 5720 S WOODLAWN AVE, CHICAGO, IL 60637 SN 0004-637X J9 ASTROPHYS J JI Astrophys. J. PD MAY 10 PY 1991 VL 372 IS 2 BP L71 EP L74 DI 10.1086/186026 PN 2 PG 4 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA FK238 UT WOS:A1991FK23800006 ER PT J AU VEDACHALAM, M RAMAKRISHNAN, VT BOYER, JH DAGLEY, IJ NELSON, KA ADOLPH, HG GILARDI, R GEORGE, C FLIPPENANDERSON, JL AF VEDACHALAM, M RAMAKRISHNAN, VT BOYER, JH DAGLEY, IJ NELSON, KA ADOLPH, HG GILARDI, R GEORGE, C FLIPPENANDERSON, JL TI FACILE SYNTHESIS AND NITRATION OF CIS-SYN-CIS-2,6-DIOXODECAHYDRO-1H,5H-DIIMIDAZO[4,5-B-4',5'-E]PYRAZINE SO JOURNAL OF ORGANIC CHEMISTRY LA English DT Article AB The title ring system was synthesized for the first time by acid-promoted condensation of ureas with 1,4-diformyl-2,3,5,6-tetrahydroxypiperazine. Nitrosation and nitration of the polycycle occurs first at the piperazine nitrogens. Successive further nitration leads to tetra-, penta-, and hexanitro derivatives. X-ray crystallographic analysis of the tetra- and hexanitro derivatives established the cis-syn-cis configuration and an all-axial conformation for this ring system. Possible reasons for the stereoselectivity of the condensation reaction are discussed. C1 UNIV NEW ORLEANS,DEPT CHEM,NEW ORLEANS,LA 70148. DEF SCI & TECHNOL ORG,MAT RES LAB,ASCOT,VIC,AUSTRALIA. USN,CTR SURFACE WARFARE,DIV ENERGET MAT,SILVER SPRING,MD 20903. USN,RES LAB,STRUCT MATTER LAB,WASHINGTON,DC 20375. NR 18 TC 28 Z9 29 U1 0 U2 4 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 10 PY 1991 VL 56 IS 10 BP 3413 EP 3419 DI 10.1021/jo00010a043 PG 7 WC Chemistry, Organic SC Chemistry GA FL744 UT WOS:A1991FL74400043 ER PT J AU KAMAL, GD PFALLER, MA REMPE, LE JEBSON, PJR AF KAMAL, GD PFALLER, MA REMPE, LE JEBSON, PJR TI REDUCED INTRAVASCULAR CATHETER INFECTION BY ANTIBIOTIC BONDING - A PROSPECTIVE, RANDOMIZED, CONTROLLED TRIAL SO JAMA-JOURNAL OF THE AMERICAN MEDICAL ASSOCIATION LA English DT Article ID PERITONEAL-DIALYSIS CATHETERS; PREVENTION; BACTERIA; CUFF AB We report a prospective, randomized, controlled clinical trial to evaluate the efficacy of antibiotic-bonded catheters in reducing theincidence of intravascular catheter-related infections. Ninety-three central venous catheters and 85 arterial catheters were studied in the surgical intensive care unit. Study catheters were pretreated with the cationic surfactant tridodecylmethylammonium chloride. The anionic antibiotic, cefazolin, was bonded before insertion of the catheters by immersing them in a 50-mg/mL solution. Fourteen percent of the 81 catheters in the control group were infected, compared with 2% of the 97 antibiotic-bonded catheters. Staphylococcus epidermidis was the most common organism obtained. There was no significant difference in the number of colonized or clinically inflamed catheter insertion sites. None of the 100 antibiotic immersion solutions yielded anything on microbiologic culture. We conclude that antibiotic bonding is an efficient, safe, and cost-effective method of reducing intravascular catheter infection in patients who are in intensive care units. C1 UNIV IOWA,COLL MED,DEPT ANESTHESIA,DIV CRIT CARE MED,IOWA CITY,IA 52242. UNIV IOWA,COLL MED,DEPT PATHOL,IOWA CITY,IA 52242. RP KAMAL, GD (reprint author), USN HOSP,DEPT ANESTHESIA,BLDG 215,PORTSMOUTH,VA 23708, USA. NR 23 TC 207 Z9 213 U1 0 U2 6 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 MAY 8 PY 1991 VL 265 IS 18 BP 2364 EP 2368 DI 10.1001/jama.265.18.2364 PG 5 WC Medicine, General & Internal SC General & Internal Medicine GA FJ955 UT WOS:A1991FJ95500031 PM 2016833 ER PT J AU KARLE, IL FLIPPENANDERSON, JL SUKUMAR, M UMA, K BALARAM, P AF KARLE, IL FLIPPENANDERSON, JL SUKUMAR, M UMA, K BALARAM, P TI MODULAR DESIGN OF SYNTHETIC PROTEIN MIMICS - CRYSTAL-STRUCTURE OF 2 7-RESIDUE HELICAL PEPTIDE SEGMENTS LINKED BY EPSILON-AMINOCAPROIC ACID SO JOURNAL OF THE AMERICAN CHEMICAL SOCIETY LA English DT Article ID ALPHA-AMINOISOBUTYRIC-ACID; AMINO-ACIDS; APOLAR; AIB; STEREOCHEMISTRY; CONFORMATIONS; DECAPEPTIDES; AGGREGATION; PARALLEL; OME AB Two seven-residue helical segments, Val-Ala-Leu-Aib-Val-Ala-Leu, were linked synthetically with an epsilon-aminocaproic acid (Acp) linker with the intention of making a stable antiparallel helix-helix motif. The crystal structure of the linked peptide Boc-Val-Ala-Leu-Aib-Val-Ala-Leu-Acp-Val-Ala-Leu-Aib-Val-Ala-Leu-OMe (1) shows the two helices displaced laterally from each other by the linker, but the linker has not folded the molecule into a close-packed antiparallel conformation. Two strong intermolecular NH...O = C hydrogen bonds are formed between the top of the lower helix of one molecule and the bottom of the upper helix in a laterally adjacent molecule to give the appearance of an extended single helix. The composite peptide with Boc and OMe end groups, C76H137N15O18.H2O, crystallize in space group P2(1) with a = 8.802 (1) angstrom, b = 20.409 (4) angstrom, c = 26.315 (3) angstrom, and beta = 90.72 (1)degrees; overall agreement R = 7.86% for 5030 observed reflections (\F(o)\ > 3-sigma(F)); resolution = 0.93 angstrom. Limited evidence for a more compact conformation in solution consistent with an antiparallel helix arrangement is obtained by comparison of the HPLC retention times and CD spectra of peptide 1 with well-characterized continuous helices of similar length and sequence. C1 INDIAN INST SCI,MOLEC BIOPHYS UNIT,BANGALORE 560012,KARNATAKA,INDIA. RP KARLE, IL (reprint author), USN,RES LAB,STRUCT MATTER LAB,WASHINGTON,DC 20375, USA. NR 32 TC 66 Z9 66 U1 0 U2 2 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0002-7863 J9 J AM CHEM SOC JI J. Am. Chem. Soc. PD MAY 8 PY 1991 VL 113 IS 10 BP 3952 EP 3956 DI 10.1021/ja00010a042 PG 5 WC Chemistry, Multidisciplinary SC Chemistry GA FL177 UT WOS:A1991FL17700042 ER PT J AU MCINTYRE, PC CIMA, MJ LIEBENBERG, DH FRANCAVILLA, TL AF MCINTYRE, PC CIMA, MJ LIEBENBERG, DH FRANCAVILLA, TL TI MIXED-STATE BEHAVIOR IN LARGE MAGNETIC-FIELDS OF HIGH-TEMPERATURE SUPERCONDUCTING FILMS PREPARED BY METALORGANIC DEPOSITION SO APPLIED PHYSICS LETTERS LA English DT Article ID DISSIPATION; CRITERION; OXIDES AB Films of Ba2YCu3O7-x prepared by metalorganic deposition (MOD) are demonstrated to have large critical current densities in high magnetic fields. The current-voltage (I-V) characteristics are reported for an MOD film in applied fields from 0 to 6 T at 77 K. The zero field critical current density was 6000 000 A/cm2 and fell to 60 000 A/cm2 at 1 T. The critical current is approximately proportional to 1/H1/2. The variation in I-V curves above the critical current indicates the voltage has a power law behavior with values for the current exponent varying from 5.2 to 1.7 for magnetic fields from 0 to 6 T. C1 OFF NAVAL RES,ARLINGTON,VA 22217. USN,RES LAB,WASHINGTON,DC 20375. RP MCINTYRE, PC (reprint author), MIT,CERAM PROC RES LAB,CAMBRIDGE,MA 02139, USA. NR 13 TC 11 Z9 11 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 6 PY 1991 VL 58 IS 18 BP 2033 EP 2035 DI 10.1063/1.105004 PG 3 WC Physics, Applied SC Physics GA FK188 UT WOS:A1991FK18800035 ER PT J AU YU, HY SANDAY, SC AF YU, HY SANDAY, SC TI CIRCULAR DISLOCATION LOOPS IN BIMATERIALS SO JOURNAL OF PHYSICS-CONDENSED MATTER LA English DT Article AB The solution of the elastic field in bimaterials due to a circular dislocation loop of arbitrary orientation within one of the materials is presented. The bimaterial is idealized as two semi-infinite isotropic elastic solids either perfectly bonded together or in frictionless contact with each other at the planar interface. The solution is obtained simply by integrating the linear superposition of the solutions for the nuclei of strain in a bimaterial over the surface of the cut formally used to generate the dislocation. It is shown that existing solutions for the loop lying in a plane parallel to the interface either inside one of the materials or at the interface between the two semi-infinite solids are special cases of the present general solution. C1 GEOCENTERS INC,FT WASHINGTON,MD. RP YU, HY (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 23 TC 14 Z9 14 U1 0 U2 0 PU IOP PUBLISHING LTD PI BRISTOL PA TECHNO HOUSE, REDCLIFFE WAY, BRISTOL, ENGLAND BS1 6NX SN 0953-8984 J9 J PHYS-CONDENS MAT JI J. Phys.-Condes. Matter PD MAY 6 PY 1991 VL 3 IS 18 BP 3081 EP 3090 DI 10.1088/0953-8984/3/18/003 PG 10 WC Physics, Condensed Matter SC Physics GA FL454 UT WOS:A1991FL45400003 ER PT J AU WANG, YD RUBNER, MF BUCKLEY, LJ AF WANG, YD RUBNER, MF BUCKLEY, LJ TI STABILITY STUDIES OF ELECTRICALLY CONDUCTING POLYHETEROCYCLES SO SYNTHETIC METALS LA English DT Article; Proceedings Paper CT INTERNATIONAL CONF ON SCIENCE AND TECHNOLOGY OF SYNTHETIC METALS ( ICSM 90 ) CY SEP 02-07, 1990 CL TUBINGEN, FED REP GER ID ELECTROCHEMICAL SYNTHESIS; MECHANICAL-PROPERTIES; POLYPYRROLE; FILMS; POLY(3-ALKYLTHIENYLENES); POLYMERS AB The stability of the electrical conductivity of two types of polyheterocycles, the poly(3-alkylthiophenes) and polypyrrole, was examined under systematically controlled environmental and thermal conditions. The conductivity stability of the polypyrroles was found to be significantly better than that of the poly(3-alkylthiophenes). Polypyrroles doped with arylsulfonates were found to exhibit excellent stability in inert atmospheres but were slightly less stable in the presence of dry or humid air. Polypyrrole samples doped with the tosylate anion were found to be the most stable, while polypyrroles doped with longer sidechain substituted benzenesulfonates exhibited poorer stability. C1 USN,CTR AIR DEV,DIV AEROSP MAT,WARMINSTER,PA 18974. RP WANG, YD (reprint author), MIT,DEPT MAT SCI & ENGN,CAMBRIDGE,MA 02139, USA. NR 18 TC 42 Z9 42 U1 0 U2 2 PU ELSEVIER SCIENCE SA LAUSANNE PI LAUSANNE 1 PA PO BOX 564, 1001 LAUSANNE 1, SWITZERLAND SN 0379-6779 J9 SYNTHETIC MET JI Synth. Met. PD MAY 6 PY 1991 VL 41 IS 3 BP 1103 EP 1108 DI 10.1016/0379-6779(91)91562-O PG 6 WC Materials Science, Multidisciplinary; Physics, Condensed Matter; Polymer Science SC Materials Science; Physics; Polymer Science GA FV271 UT WOS:A1991FV27100067 ER PT J AU KHUSMITH, S CHAROENVIT, Y KUMAR, S SEDEGAH, M BEAUDOIN, RL HOFFMAN, SL AF KHUSMITH, S CHAROENVIT, Y KUMAR, S SEDEGAH, M BEAUDOIN, RL HOFFMAN, SL TI PROTECTION AGAINST MALARIA BY VACCINATION WITH SPOROZOITE SURFACE PROTEIN-2 PLUS CS PROTEIN SO SCIENCE LA English DT Article ID CIRCUMSPOROZOITE PROTEIN; MONOCLONAL-ANTIBODIES; PLASMODIUM-YOELII; MAMMALIAN-CELLS; MURINE MALARIA; EXPRESSION; EFFICIENT; VACCINES; ANTIGENS; SYSTEM AB The circumsporozoite (CS) protein has been the target for development of malaria sporozoite vaccines for a decade. However, immunization with subunit vaccines based on the CS protein has never given the complete protection found after immunization with irradiated sporozoites. BALB/c mice immunized with irradiated Plasmodium yoelii sporozoites produced antibodies and cytotoxic T cells against a 140-kilodalton protein, sporozoite surface protein 2 (SSP2). Mice immunized with P815 cells that had been transfected with either SSP2 or CS genes were partially protected, and those immunized with a mixture of SSP2 and CS transfectants were completely protected against malaria. These studies emphasize the importance of vaccine delivery systems in achieving protection and define a multi-antigen sporozoite vaccine. C1 USN,MED RES INST,MALARIA PROGRAM,BETHESDA,MD 20889. NIH,PARASIT DIS LAB,BETHESDA,MD 20892. NR 33 TC 167 Z9 167 U1 2 U2 5 PU AMER ASSOC ADVANCEMENT SCIENCE PI WASHINGTON PA 1200 NEW YORK AVE, NW, WASHINGTON, DC 20005 SN 0036-8075 J9 SCIENCE JI Science PD MAY 3 PY 1991 VL 252 IS 5006 BP 715 EP 718 DI 10.1126/science.1827210 PG 4 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA FK185 UT WOS:A1991FK18500052 PM 1827210 ER PT J AU KARPOUZIAN, G AF KARPOUZIAN, G TI ASYMPTOTIC THEORY OF BENDING-TORSION FLUTTER OF HIGH ASPECT RATIO WING IN THE TORSION CONTROLLED DOMAIN SO AIAA JOURNAL LA English DT Article AB AN asymptotic theory of bending-torsion flutter of a high aspect ratio wing with a unit-order bending-torsion stiffness ratio is developed. Two distinct (high and low) frequency domains are identified. For illustration, detailed analysis is carried out only in the high-frequency domain. The methodology is general and may be applicable to various wing configurations. To substantiate its adequacy, the classical case of a uniform unswept cantilever wing in an incompressible airflow is treated as a case study. The asymptotic results for flutter eigenvalues and mode shapes compare favorably with those obtained by a more exact treatment. RP KARPOUZIAN, G (reprint author), USN ACAD,DEPT AEROSP ENGN,ANNAPOLIS,MD 21402, USA. NR 3 TC 0 Z9 0 U1 0 U2 0 PU AMER INST AERONAUT ASTRONAUT PI RESTON PA 1801 ALEXANDER BELL DRIVE, STE 500, RESTON, VA 22091 SN 0001-1452 J9 AIAA J JI AIAA J. PD MAY PY 1991 VL 29 IS 5 BP 780 EP 781 DI 10.2514/3.10655 PG 2 WC Engineering, Aerospace SC Engineering GA FM533 UT WOS:A1991FM53300022 ER PT J AU OSBORN, RE ALDER, DC MITCHELL, CS AF OSBORN, RE ALDER, DC MITCHELL, CS TI MR IMAGING OF THE BRAIN IN PATIENTS WITH MIGRAINE HEADACHES SO AMERICAN JOURNAL OF NEURORADIOLOGY LA English DT Article ID WHITE-MATTER LESIONS; ELDERLY SUBJECTS; AGING BRAIN; SCANS; FOCI AB Forty-one patients with migraine headaches were referred for MR imaging of the brain. Intermediate and T2-weighted images were obtained to determine the frequency of areas of high intensity within the white matter. The average age of these patients was 29.8 years; only five were over 40 years old. Each patient was evaluated in the axial plane with long TR/short and long TE images. Twenty-three patients also had T1-weighted short TR/short TE MR scans; enhancement with gadopentetate dimeglumine was used in three patients. Intracranial abnormalities were seen in only six patients: foci or white matter high intensity on intermediate and T2-weighted images in five and a venous angioma in one. Prior studies have indicated that parenchymal brain abnormalities may be found in up to 46% of patients with migraines. The current study demonstrated parenchymal brain lesions in only 12%. This study suggests that the frequency of foci of high intensity seen on long TR sequences in the migraine patient is much lower than previously reported, especially in patients under 40 years old (5.5% in our series). C1 USN HOSP,DEPT RADIOL,SAN DIEGO,CA 92134. USN HOSP,DEPT CLIN INVEST,SAN DIEGO,CA 92134. NR 14 TC 64 Z9 65 U1 0 U2 0 PU AMER SOC NEURORADIOLOGY PI OAK BROOK PA 2210 MIDWEST RD, OAK BROOK, IL 60521 SN 0195-6108 J9 AM J NEURORADIOL JI Am. J. Neuroradiol. PD MAY-JUN PY 1991 VL 12 IS 3 BP 521 EP 524 PG 4 WC Clinical Neurology; Neuroimaging; Radiology, Nuclear Medicine & Medical Imaging SC Neurosciences & Neurology; Radiology, Nuclear Medicine & Medical Imaging GA FJ904 UT WOS:A1991FJ90400029 PM 2058506 ER PT J AU CHAUHAN, SP AF CHAUHAN, SP TI QUESTIONS ABOUT PROPHYLACTIC INTRAPARTUM AMNIOINFUSION SO AMERICAN JOURNAL OF OBSTETRICS AND GYNECOLOGY LA English DT Letter ID DECELERATIONS; RELIEF RP CHAUHAN, SP (reprint author), USN HOSP,BOX 19,FPO,NEW YORK,NY 09521, USA. NR 4 TC 0 Z9 0 U1 0 U2 0 PU MOSBY-YEAR BOOK INC PI ST LOUIS PA 11830 WESTLINE INDUSTRIAL DR, ST LOUIS, MO 63146-3318 SN 0002-9378 J9 AM J OBSTET GYNECOL JI Am. J. Obstet. Gynecol. PD MAY PY 1991 VL 164 IS 5 BP 1365 EP 1365 PN 1 PG 1 WC Obstetrics & Gynecology SC Obstetrics & Gynecology GA FM348 UT WOS:A1991FM34800052 PM 2035584 ER PT J AU ZELENY, WB AF ZELENY, WB TI SYMMETRY IN ELECTRODYNAMICS - A CLASSICAL APPROACH TO MAGNETIC MONOPOLES SO AMERICAN JOURNAL OF PHYSICS LA English DT Article AB A simple means of deriving Maxwell's equations and the Lorentz force law from their symmetries is presented. The same approach is then used to derive the classical theory of magnetic monopoles and dual-charged particles. RP ZELENY, WB (reprint author), USN,POSTGRAD SCH,DEPT PHYS,MONTEREY,CA 93943, USA. NR 4 TC 7 Z9 8 U1 0 U2 1 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0002-9505 J9 AM J PHYS JI Am. J. Phys. PD MAY PY 1991 VL 59 IS 5 BP 412 EP 415 DI 10.1119/1.16519 PG 4 WC Education, Scientific Disciplines; Physics, Multidisciplinary SC Education & Educational Research; Physics GA FH768 UT WOS:A1991FH76800009 ER PT J AU BAIRD, JK BASRI, H PURNOMO BANGS, MJ SUBIANTO, B PATCHEN, LC HOFFMAN, SL AF BAIRD, JK BASRI, H PURNOMO BANGS, MJ SUBIANTO, B PATCHEN, LC HOFFMAN, SL TI RESISTANCE TO CHLOROQUINE BY PLASMODIUM-VIVAX IN IRIAN-JAYA, INDONESIA SO AMERICAN JOURNAL OF TROPICAL MEDICINE AND HYGIENE LA English DT Article ID FALCIPARUM AB Evidence of emerging resistance to chloroquine by Plasmodium vivax is described from Irian Jaya (Indonesian New Guinea). Sixteen of 24 residents in the village of Arso PIR II taking supervised weekly chloroquine prophylaxis (5 mg base/kg) had asexual parasitemia with P. vivax at least once during eight weeks of surveillance. An American working in the same village developed symptomatic P. vivax parasitemia despite chloroquine prophylaxis. Five days after therapy with 600 mg chloroquine base, the asexual parasitemia in the American increased 40-fold, but cleared after treatment with 1, 500 mg chloroquine base. Serum samples were not available from many of the cases, but six local residents and the American had serum levels of chloroquine in excess of the ordinarily suppressive 15 ng/ml at the time of their asexual parasitemias (16-70 ng/ml). The weekly 300 mg base tablet of chloroquine, which has been the standard for prophylaxis against malaria for more than 40 years, was not effective against P. vivax in Arso PIR, Irian Jaya. C1 USN,MED RES UNIT 2,JAKARTA DETACHMENT,JAKARTA,INDONESIA. DINAS KESEHATAN DATA I PROPINSI IRIAN JAYA,IRIAN JAYA,INDONESIA. CTR DIS CONTROL,ATLANTA,GA 30333. USN,MED RES INST,BETHESDA,MD 20814. NR 15 TC 170 Z9 172 U1 0 U2 0 PU AMER SOC TROP MED & HYGIENE PI MCLEAN PA 8000 WESTPARK DRIVE SUITE 130, MCLEAN, VA 22101 SN 0002-9637 J9 AM J TROP MED HYG JI Am. J. Trop. Med. Hyg. PD MAY PY 1991 VL 44 IS 5 BP 547 EP 552 PG 6 WC Public, Environmental & Occupational Health; Tropical Medicine SC Public, Environmental & Occupational Health; Tropical Medicine GA FW270 UT WOS:A1991FW27000012 PM 1676566 ER PT J AU ZEHNA, PW AF ZEHNA, PW TI ON PROVING THAT X AND S2 ARE INDEPENDENT SO AMERICAN STATISTICIAN LA English DT Article DE FUNCTIONS OF RANDOM VARIABLES; HELMERT TRANSFORMATION; INDEPENDENCE; SAMPLE MEAN; SAMPLE VARIANCE AB The need to establish the independence of the sample mean and the sample variance in sampling from a normal population arises early in a course in statistics. For the result is an essential ingredient in the derivation of the Student-t distribution for statistical inference. Often this need arises before the tools, notably multivariate methods, for a rigorous proof are available. Occasionally one will find attempts to derive this result using only bivariate assumptions. A recent article in this journal, as well as some current textbooks, offer such a proof. In all cases there are serious questions about the validity of the proofs. RP ZEHNA, PW (reprint author), USN,NAVAL POSTGRAD SCH,DEPT OPERAT RES,MONTEREY,CA 93943, USA. NR 7 TC 2 Z9 2 U1 0 U2 0 PU AMER STATIST ASSN PI ALEXANDRIA PA 1429 DUKE ST, ALEXANDRIA, VA 22314 SN 0003-1305 J9 AM STAT JI Am. Stat. PD MAY PY 1991 VL 45 IS 2 BP 121 EP 122 DI 10.2307/2684372 PG 2 WC Statistics & Probability SC Mathematics GA FH584 UT WOS:A1991FH58400008 ER PT J AU MAXWELL, JM RAGLAND, JJ AF MAXWELL, JM RAGLAND, JJ TI APPENDICITIS - IMPROVEMENTS IN DIAGNOSIS AND TREATMENT SO AMERICAN SURGEON LA English DT Article ID POSTOPERATIVE WOUND-INFECTION; APPENDECTOMY; MORTALITY AB The results of therapy in cases of suspected acute appendicitis were reviewed in 844 consecutive cases of appendicitis occurring over a 3-year period. A diagnostic accuracy of 87.4 per cent was found as well as a perforation rate of 18.4 per cent. Complication rates varied with the clinical state of the appendix: 16 per cent in perforated, 5.6 per cent in nonperforated, and 11.3 per cent in normal appendices. Excellent results were routinely obtainable employing early operative intervention, perioperative antibiotics, and a systematic surgical approach. C1 USN HOSP,DEPT GEN SURG,SAN DIEGO,CA 92134. RP MAXWELL, JM (reprint author), USN HOSP,DEPT CLIN INVEST,SAN DIEGO,CA 92134, USA. NR 23 TC 34 Z9 35 U1 0 U2 0 PU SOUTHEASTERN SURGICAL CONGRESS PI ATLANTA PA 1776 PEACHTREE RD, NW., SUITE 410N, ATLANTA, GA 30309-2352 SN 0003-1348 J9 AM SURGEON JI Am. Surg. PD MAY PY 1991 VL 57 IS 5 BP 282 EP 285 PG 4 WC Surgery SC Surgery GA FP104 UT WOS:A1991FP10400003 PM 2039123 ER PT J AU SCARANO, G ROMEI, C SERITTI, A ZIRINO, A AF SCARANO, G ROMEI, C SERITTI, A ZIRINO, A TI ETHYLENEDIAMINE IN THE VOLTAMMETRIC DETERMINATION OF COPPER IN SEA-WATER AT A ROTATING MERCURY FILM ELECTRODE SO ANALYTICA CHIMICA ACTA LA English DT Article DE VOLTAMMETRY; COPPER; ETHYLENEDIAMINE; SEA WATER ID ANODIC-STRIPPING VOLTAMMETRY; DISK ELECTRODE; COMPLEXATION; SEAWATER; CADMIUM; SPECIATION; CONSTANTS; PACIFIC; LEAD AB The use of ethylenediamine in the voltammetric study of copper in natural sea water was evaluated for applicability with rotating thin mercury film electrodes. It was shown that this method increases the analytical sensitivity for copper at such electrodes by at least a factor of 4, and improves the detection of pH 8 labile copper. C1 USN, CTR OCEAN SYST, MARINE ENVIRONM BRANCH, SAN DIEGO, CA 92152 USA. RP SCARANO, G (reprint author), CNR, IST BIOFIS, VIA S LORENZO 26, I-56100 PISA, ITALY. NR 24 TC 8 Z9 8 U1 0 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0003-2670 EI 1873-4324 J9 ANAL CHIM ACTA JI Anal. Chim. Acta PD MAY 1 PY 1991 VL 245 IS 2 BP 177 EP 181 DI 10.1016/S0003-2670(00)80218-4 PG 5 WC Chemistry, Analytical SC Chemistry GA FL090 UT WOS:A1991FL09000007 ER PT J AU VIDMAR, DA DEVANEY, K AF VIDMAR, DA DEVANEY, K TI SLOWLY GROWING NODULE OF THE DORSUM OF THE FOOT - DIAGNOSIS - PHAEOMYCOTIC CYST SO ARCHIVES OF DERMATOLOGY LA English DT Note ID PHAEOHYPHOMYCOSIS RP VIDMAR, DA (reprint author), USN HOSP,BETHESDA,MD 20814, USA. NR 5 TC 0 Z9 0 U1 0 U2 0 PU AMER MEDICAL ASSOC PI CHICAGO PA 515 N STATE ST, CHICAGO, IL 60610 SN 0003-987X J9 ARCH DERMATOL JI Arch. Dermatol. PD MAY PY 1991 VL 127 IS 5 BP 721 EP & PG 0 WC Dermatology SC Dermatology GA FL673 UT WOS:A1991FL67300018 PM 2024993 ER PT J AU FEY, AL SPANGLER, SR CORDES, JM AF FEY, AL SPANGLER, SR CORDES, JM TI VLA AND VLBI ANGULAR BROADENING MEASUREMENTS - THE DISTRIBUTION OF INTERSTELLAR SCATTERING AT LOW GALACTIC LATITUDES SO ASTROPHYSICAL JOURNAL LA English DT Article DE INTERSTELLAR, MATTER; RADIO SOURCES, GENERAL; TURBULENCE ID ELECTRON-DENSITY TURBULENCE; DOUBLE RADIO-SOURCES; SUPER-NOVA REMNANTS; RECOMBINATION LINES; 325 MHZ; CYGNUS; ORIGIN; PLANE; SCALE AB We report dual-frequency VLA and multifrequency VLBI angular broadening measurements of a number of radio sources located along the Galactic plane in the longitude range l = 20-degrees-80-degrees and with Galactic latitude \b\ < 0.5-degrees. We use the lambda-2 dependence of scattered angular size to distinguish between intrinsic and scattered source structure. Our observations support a previous report that the structure of the extragalactic source 1849+005 is dominated by interstellar scattering. This source appears to be one of the most heavily scattered sources known. We have also observed angular broadening for the sources 1855+031 and 2008+33D. Five additional sources, 1905+079, 1922+155, 1932+204, 1954+282, and 2001+304 show indications of being affected by interstellar scattering. For the remaining sources we obtain upper limits to scattering with the value of the upper limit depending on the observed source structure. We find that the observed scattering in the Galactic plane decreases with increasing Galactic longitude, reaching a minimum at l almost-equal-to 60-degrees and then becoming prominent again in the Cygnus region. The magnitude of scattering in the interarm region between l = 50-degrees-70-degrees is comparable to that predicted by a model calculation of a "smooth" component of interstellar turbulence. The more intense "clumps" of interstellar turbulence may therefore be mainly confined to the spiral arms of the Galaxy. A computer simulation was undertaken to find clump properties consistent with our observations. This simulation indicates that a complex distribution of clumps is necessary, with a range of scattering strengths, and that the form of the clump distribution as well as the density of clumps must change with increasing galactocentric distance. The simulation constrains the z scale height in the Cygnus region to be approximately 40-70 pc. Although there is a weak correlation between scattering and H166-alpha-emission measure, interpretation of this result is unclear and leaves open the identification of the regions of enhanced turbulence. C1 USN,RES LAB,CTR ADV SPACE SENSING,WASHINGTON,DC 20375. CORNELL UNIV,DEPT ASTRON,ITHACA,NY 14853. RP FEY, AL (reprint author), UNIV IOWA,DEPT PHYS & ASTRON,VAN ALLEN HALL,IOWA CITY,IA 52242, USA. NR 39 TC 35 Z9 35 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 1991 VL 372 IS 1 BP 132 EP 160 DI 10.1086/169960 PN 1 PG 29 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA FH367 UT WOS:A1991FH36700013 ER PT J AU WANG, YM SHEELEY, NR AF WANG, YM SHEELEY, NR TI WHY FAST SOLAR-WIND ORIGINATES FROM SLOWLY EXPANDING CORONAL FLUX TUBES SO ASTROPHYSICAL JOURNAL LA English DT Article ID INTERPLANETARY MAGNETIC-FIELD AB Empirical studies indicate that the solar wind speed at Earth is inversely correlated with the divergence rate of the coronal magnetic field. We show that this result is consistent with simple wind acceleration models involving Alfven waves, provided that the wave energy flux at the coronal base is taken to be roughly constant within open field regions. RP WANG, YM (reprint author), USN,RES LAB,EO HULBURT CTR SPACE RES,CODE 4172,WASHINGTON,DC 20375, USA. NR 9 TC 82 Z9 83 U1 0 U2 2 PU UNIV CHICAGO PRESS PI CHICAGO PA 5720 S WOODLAWN AVE, CHICAGO, IL 60637 SN 0004-637X J9 ASTROPHYS J JI Astrophys. J. PD MAY 1 PY 1991 VL 372 IS 1 BP L45 EP L48 DI 10.1086/186020 PN 2 PG 4 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA FH368 UT WOS:A1991FH36800012 ER PT J AU TIKUISIS, P WEATHERSBY, PK NISHI, RY AF TIKUISIS, P WEATHERSBY, PK NISHI, RY TI MAXIMUM-LIKELIHOOD ANALYSIS OF AIR AND HEO2 DIVES SO AVIATION SPACE AND ENVIRONMENTAL MEDICINE LA English DT Note ID DECOMPRESSION-SICKNESS AB The method of maximum likelihood analysis was applied to data consisting of 1,949 man-dives, of which 1,041 were on air and 908 were on HeO2 mixtures. These dives represented a wide range of bottom time and depth combinations, and had an overall incidence of decompression sickness (DCS) of 4.64%. Several models, based on single exponential gas uptake in either one or two compartments, were tested for predicting the incidence of DCS. The criterion for defining the risk of DCS was based on the concept of potential gas volume (i.e., the volume of a bubble that could form and be in equilibrium with the remaining gas dissolved in solution). This criterion takes into account the solubilities of the gases in solution, but can be adjusted to account only for the partial pressures of the gases. The best model for the prediction of DCS was found for two compartments where the kinetics (time constants) and not the gas solubilities of nitrogen and helium were distinguished from each other. Results using the best prediction model with the present data suggests the following: 1) most of the risk of DCS occurs after surfacing; 2) most of the risk occurs in the "slow" compartment (approximately 420 min time constant); and 3) nitrogen contributes about twice as much as helium to the risk of DCS for HeO2 dives. C1 USN,SUBMARINE MED RES LAB,GROTON,CT 06340. RP TIKUISIS, P (reprint author), DEF & CIVIL INST ENVIRONM MED,1133 SHEPPARD AVE W,POB 2000,TORONTO M3M 3B9,ONTARIO,CANADA. NR 17 TC 9 Z9 9 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 1991 VL 62 IS 5 BP 425 EP 431 PG 7 WC Public, Environmental & Occupational Health; Medicine, General & Internal; Sport Sciences SC Public, Environmental & Occupational Health; General & Internal Medicine; Sport Sciences GA FJ997 UT WOS:A1991FJ99700009 PM 2053908 ER PT J AU SMITH, DR GEER, IW AF SMITH, DR GEER, IW TI ESTABLISHMENT OF THE AMERICAN-METEOROLOGICAL-SOCIETY ATMOSPHERIC EDUCATION RESOURCE AGENTS (AERA) PROGRAM SO BULLETIN OF THE AMERICAN METEOROLOGICAL SOCIETY LA English DT Article C1 SUNY COLL BROCKPORT,DEPT EARTH SCI,BROCKPORT,NY 14420. RP SMITH, DR (reprint author), USN ACAD,DEPT OCEANOG,ANNAPOLIS,MD 21402, USA. NR 2 TC 13 Z9 13 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 MAY PY 1991 VL 72 IS 5 BP 612 EP 615 PG 4 WC Meteorology & Atmospheric Sciences SC Meteorology & Atmospheric Sciences GA FM071 UT WOS:A1991FM07100003 ER PT J AU BLECHNER, SL MORRIS, W SCHOEN, PE YAGER, P SINGH, A RHODES, DG AF BLECHNER, SL MORRIS, W SCHOEN, PE YAGER, P SINGH, A RHODES, DG TI STRUCTURE OF POLYMERIZABLE LIPID BILAYERS .3. 2 HEPTACOSADIYNOYL PHOSPHATIDYLCHOLINE ISOMERS SO CHEMISTRY AND PHYSICS OF LIPIDS LA English DT Article DE POLYMERIZABLE LIPID; DIACETYLENE; X-RAY STRUCTURE; TUBULE ID X-RAY-DIFFRACTION; NEUTRON-DIFFRACTION; LECITHIN; TUBULES; MEMBRANES; PROFILE; PHASE; MODEL AB The structures of hydrated bilayers of 1,2-bis(10,12-heptacosadiynoyl)-sn-glycero-3-phosphocholine (DC8, 13PC) and 1,2-bis-(11,13-heptacosadiynoyl)-sn-glycero-3-phosphocholine (DC9, 12PC) were investigated using low-angle X-ray diffraction. Multilayer stacks of these diacetylenic phosphatidylcholine derivatives were highly ordered, typically yielding up to 16 orders of lamellar diffraction. The unit cell repeat was smaller than expected for lipids of this size. The electron density profiles of both 27 carbon lipid bilayers contained peaks at 10 angstrom and 16 angstrom from the bilayer center due to the diacetylene moieties. The electron density profile for DC8, 13PC was similar to that of the previously studied polymerizable lipid, DC8, 9PC, except that in the DC8, 13PC profile, the distance between diacetylene electron density maxima on opposing sides of the bilayer was approximately 4 angstrom further apart. The electron density profile of DC9, 12PC showed that the peaks corresponding to the diacetylenic regions were at approximately the same positions as in the DC8, 13PC bilayers, but were less well resolved. Acyl chains in model structures inferred from the electron density data are tilted relative to the bilayer normal and may not be as well ordered as previously believed. C1 UNIV CONNECTICUT,CTR HLTH,DEPT RADIOL,CTR BIOMOLEC STRUCT ANAL,FARMINGTON,CT 06032. USN,RES LAB,CTR BIOMOLEC SCI & ENGN,WASHINGTON,DC 20375. UNIV WASHINGTON,SEATTLE,WA 98195. NR 31 TC 13 Z9 13 U1 1 U2 3 PU ELSEVIER SCI IRELAND LTD PI CLARE PA CUSTOMER RELATIONS MANAGER, BAY 15, SHANNON INDUSTRIAL ESTATE CO, CLARE, IRELAND SN 0009-3084 J9 CHEM PHYS LIPIDS JI Chem. Phys. Lipids PD MAY-JUN PY 1991 VL 58 IS 1-2 BP 41 EP 54 DI 10.1016/0009-3084(91)90110-W PG 14 WC Biochemistry & Molecular Biology; Biophysics SC Biochemistry & Molecular Biology; Biophysics GA FU464 UT WOS:A1991FU46400006 ER PT J AU MILLIKEN, J KELLER, TM BARONAVSKI, AP MCELVANY, SW CALLAHAN, JH NELSON, HH AF MILLIKEN, J KELLER, TM BARONAVSKI, AP MCELVANY, SW CALLAHAN, JH NELSON, HH TI THERMAL AND OXIDATIVE ANALYSES OF BUCKMINSTERFULLERENE, C60 SO CHEMISTRY OF MATERIALS LA English DT Note ID STABILITY; CARBON; C-60 RP MILLIKEN, J (reprint author), USN,RES LAB,DIV CHEM,CODE 6100,WASHINGTON,DC 20375, USA. NR 10 TC 83 Z9 83 U1 1 U2 8 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0897-4756 J9 CHEM MATER JI Chem. Mat. PD MAY-JUN PY 1991 VL 3 IS 3 BP 386 EP 387 DI 10.1021/cm00015a005 PG 2 WC Chemistry, Physical; Materials Science, Multidisciplinary SC Chemistry; Materials Science GA FN827 UT WOS:A1991FN82700005 ER PT J AU ADAMIC, KJ GREENBAUM, SG ABRAHAM, KM ALAMGIR, M WINTERSGILL, MC FONTANELLA, JJ AF ADAMIC, KJ GREENBAUM, SG ABRAHAM, KM ALAMGIR, M WINTERSGILL, MC FONTANELLA, JJ TI LI-7 NMR-STUDY OF POLYMER ELECTROLYTES BASED ON COMPOSITES OF POLY[BIS((METHOXYETHOXY)ETHOXY)PHOSPHAZENE] AND POLY(ETHYLENE OXIDE) SO CHEMISTRY OF MATERIALS LA English DT Article ID NUCLEAR MAGNETIC-RESONANCE; CONDUCTIVITY; SALTS AB Polymer electrolytes consisting of mixtures of poly[bis((methoxyethoxy)ethoxy)phosphazene] (MEEP) and poly(ethylene oxide) (PEO) or poly(propylene oxide) (PPO) complexed with LiClO4 or LiBF4 have been studied by differential scanning calorimetry (DSC) and Li-7 nuclear magnetic resonance (NMR) spectroscopy. Both types of measurements demonstrate that the MEEP/PEO composites are multiphase in that amorphous MEEP-like and crystalline PEO-like phases are present in the samples. The NMR results show that significant Li+ ion mobility in the MEEP-like phase occurs only above the lowest temperatures glass transition as indicated by DSC measurements. Strong cation-anion association effects are suggested by dipolar broadening in BF4- containing materials and by precipitation of salt crystallites from the MEEP/PPO composite at elevated temperature. C1 CUNY HUNTER COLL,DEPT PHYS,NEW YORK,NY 10021. EIC LABS INC,NORWOOD,MA 02062. USN ACAD,DEPT PHYS,ANNAPOLIS,MD 21402. NR 17 TC 25 Z9 26 U1 1 U2 4 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0897-4756 J9 CHEM MATER JI Chem. Mat. PD MAY-JUN PY 1991 VL 3 IS 3 BP 534 EP 538 DI 10.1021/cm00015a032 PG 5 WC Chemistry, Physical; Materials Science, Multidisciplinary SC Chemistry; Materials Science GA FN827 UT WOS:A1991FN82700032 ER PT J AU CULHAM, P AF CULHAM, P TI THE INFLUENCE OF SEA POWER ON ANCIENT-HISTORY - STARR,CG SO CLASSICAL WORLD LA English DT Book Review RP CULHAM, P (reprint author), USN ACAD,ANNAPOLIS,MD 21402, USA. NR 1 TC 0 Z9 0 U1 0 U2 0 PU CLASSICAL ASSN ATLANTIC ST INC PI PITTSBURGH PA DUQUESNE UNIV DEPT CLASSICS, PITTSBURGH, PA 15282 SN 0009-8418 J9 CLASSICAL WORLD JI Class. World PD MAY-JUN PY 1991 VL 84 IS 5 BP 402 EP 402 DI 10.2307/4350872 PG 1 WC Classics SC Classics GA FR541 UT WOS:A1991FR54100020 ER PT J AU MCNEIL, MB LITTLE, BJ AF MCNEIL, MB LITTLE, BJ TI MACKINAWITE FORMATION DURING MICROBIAL CORROSION - REPLY SO CORROSION LA English DT Discussion C1 USN,STENNIS SPACE CTR,MS 39529. RP MCNEIL, MB (reprint author), NAVCOASTSYSCEN,COBE 2110,PANAMA CITY,FL 32407, USA. NR 4 TC 1 Z9 1 U1 0 U2 1 PU NATL ASSN CORROSION ENG PI HOUSTON PA 1440 SOUTH CREEK DRIVE, HOUSTON, TX 77084-4906 SN 0010-9312 J9 CORROSION JI Corrosion PD MAY PY 1991 VL 47 IS 5 BP 329 EP 329 PG 1 WC Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Materials Science; Metallurgy & Metallurgical Engineering GA FX944 UT WOS:A1991FX94400003 ER PT J AU WEISS, E AF WEISS, E TI BIOLOGY OF EHRLICHIAE SO EUROPEAN JOURNAL OF EPIDEMIOLOGY LA English DT Article; Proceedings Paper CT 4TH INTERNATIONAL SYMP ON RICKETTSIAE AND RICKETTSIAL DISEASES CY OCT 01-06, 1990 CL PIESTANY SPA, PIESTANY, CZECHOSLOVAKIA SP SLOVAK ACAD SCI, INST VIROL HO PIESTANY SPA DE EHRLICHIAE; RICKETTSIAE; CHLAMYDIAE; PHYLOGENY; PHAGOSOME; ENERGY METABOLISM AB The isolation and cultivation of the agent of Potomac horse fever, Ehrlichia risticii, by Holland, Ristic, et al., afforded Weisburg et al. an opportunity to examine its phylogeny. E. risticii is clearly related to the genus Rickettsia and not to chlamydiae. A reevaluation of the significance of phenotypic characteristics is thus required, since ehrlichiae, in some respects, resemble chlamydiae. For example, unlike rickettsiae, ehrlichiae and chlamydiae multiply in the phagosome of their host cells, but may not have the same mechanism of inhibition of phagosome-lysosome fusion. Rickettsiae, which multiply in the cytoplasm, may have a mechanism of survival in the phagosome similar to that of the ehrlichiae, but, in addition, utilize a phospholipase, which permits prompt escape from the phagosome. Rickettsiae, as most Gram negatives, multiply by binary fisson. Chlamydiae, on the other hand, undergo a cycle of development. Elementary bodies (EB) infect, but do not divide, while the reverse is true of reticulate bodies (RB). Ehrlichiae superficially resemble chlamydiae rather than rickettsiae, but ehrlichiae have not yet been submitted to the rigorous criteria of separation of EB and RB. Investigations in our laboratory of the metabolic activities of E. risticii and E. sennetsu link them to the rickettsiae and not to the chlamydiae. Ehrlichiae and rickettsiae, but not chlamydiae, derive some ATP from their catabolic activities. In conclusion, in further investigations of the monocytic ehrlichiae, it is safer to be guided by what we know of rickettsiae, than chlamydiae. RP WEISS, E (reprint author), USN,MED RES INST,BETHESDA,MD 20889, USA. NR 0 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 0393-2990 J9 EUR J EPIDEMIOL JI Eur. J. Epidemiol. PD MAY PY 1991 VL 7 IS 3 BP 253 EP 258 DI 10.1007/BF00145674 PG 6 WC Public, Environmental & Occupational Health SC Public, Environmental & Occupational Health GA FP049 UT WOS:A1991FP04900009 PM 1884777 ER PT J AU LI, J ZHU, JD APPIAH, A MCCUTCHAN, TF LONG, GW MILHOUS, WK HOLLINGDALE, MR AF LI, J ZHU, JD APPIAH, A MCCUTCHAN, TF LONG, GW MILHOUS, WK HOLLINGDALE, MR TI PLASMODIUM-BERGHEI - QUANTITATION OF INVITRO EFFECTS OF ANTIMALARIAL-DRUGS ON EXOERYTHROCYTIC DEVELOPMENT BY A RIBOSOMAL-RNA PROBE SO EXPERIMENTAL PARASITOLOGY LA English DT Article DE PLASMODIUM-BERGHEI; MALARIA; RIBOSOMAL-RNA PROBE; MALARIAL CHEMOTHERAPY; INVITRO DRUG ASSAY; RIBOSOMAL RNA (RIBOSOMAL-RNA); EXOERYTHROCYTIC (EE); 50-PERCENT INHIBITORY CONCENTRATION (IC50); PRIMAQUINE (PQ) PYRIMETHAMINE (PYR); CHLOROQUINE (CQ); STANDARD SALINE CITRATE (SSC) ID STAGE; POPULATIONS; CULTIVATION; SPOROZOITES; FALCIPARUM; DIAGNOSIS; CULTURE; MALARIA C1 BIOMED RES INST, ROCKVILLE, MD 20852 USA. NIAID, PARASIT DIS LAB, BETHESDA, MD 20892 USA. USN, DEPT INFECT DIS, DIV MALARIA, BETHESDA, MD 20814 USA. WALTER REED ARMY MED CTR, DEPT PARASITOL, DIV EXPTL THERAPEUT, WASHINGTON, DC 20307 USA. RP LI, J (reprint author), SECOND MIL MED UNIV, 594 XIANG YIN RD, SHANGHAI, PEOPLES R CHINA. NR 21 TC 13 Z9 13 U1 0 U2 1 PU ACADEMIC PRESS INC ELSEVIER SCIENCE PI SAN DIEGO PA 525 B ST, STE 1900, SAN DIEGO, CA 92101-4495 USA SN 0014-4894 EI 1090-2449 J9 EXP PARASITOL JI Exp. Parasitol. PD MAY PY 1991 VL 72 IS 4 BP 450 EP 458 DI 10.1016/0014-4894(91)90091-A PG 9 WC Parasitology SC Parasitology GA FK855 UT WOS:A1991FK85500013 PM 2026219 ER PT J AU BOSSHARD, M AF BOSSHARD, M TI L'ECLAIRCIE' - FRENCH - CHAWAF,C SO FRENCH REVIEW LA English DT Book Review RP BOSSHARD, M (reprint author), USN ACAD,ANNAPOLIS,MD 21402, USA. NR 1 TC 0 Z9 0 U1 0 U2 0 PU AMER ASSN TEACH FRENCH PI CHAMPAIGN PA 57 EAST ARMORY AVE, CHAMPAIGN, IL 61820 SN 0016-111X J9 FR REV JI Fr. Rev. PD MAY PY 1991 VL 64 IS 6 BP 1071 EP 1072 PG 2 WC Literature, Romance SC Literature GA FK160 UT WOS:A1991FK16000046 ER PT J AU SCHOENFELD, PS JONES, DM LAWSON, JM AF SCHOENFELD, PS JONES, DM LAWSON, JM TI CONDUCTED CURRENT ON GUIDEWIRES IN SINGLE LUMEN PAPILLOTOMES SO GASTROINTESTINAL ENDOSCOPY LA English DT Article ID SPHINCTEROTOMY AB An in vitro electrical circuit was designed to measure conducted current in plastic-coated guidewires and standard guidewires inserted in a single lumen papillotome. Single lumen papillotomes, which are more flexible than double lumen papillotomes, require the removal of the guidewire before electrosurgery due to concern over conducted current. In an in vitro electrical circuit, equivalent current was measured in both the papillotome wire and the standard guidewire. Plastic-coated guidewires did not allow any current flow. The advantages of flexible single lumen papillotomes and maintenance of deep biliary cannulation over a guidewire may be combined if insulated plastic-coated guidewires are used. RP SCHOENFELD, PS (reprint author), USN HOSP,DEPT INTERNAL MED,PORTSMOUTH,VA 23708, USA. NR 4 TC 6 Z9 6 U1 0 U2 0 PU MOSBY-YEAR BOOK INC PI ST LOUIS PA 11830 WESTLINE INDUSTRIAL DR, ST LOUIS, MO 63146-3318 SN 0016-5107 J9 GASTROINTEST ENDOSC JI Gastrointest. Endosc. PD MAY-JUN PY 1991 VL 37 IS 3 BP 344 EP 346 DI 10.1016/S0016-5107(91)70728-1 PG 3 WC Gastroenterology & Hepatology SC Gastroenterology & Hepatology GA FQ062 UT WOS:A1991FQ06200011 PM 2070986 ER PT J AU WHANGPENG, J KNUTSEN, T GAZDAR, A STEINBERG, SM OIE, H LINNOILA, I MULSHINE, J NAU, M MINNA, JD AF WHANGPENG, J KNUTSEN, T GAZDAR, A STEINBERG, SM OIE, H LINNOILA, I MULSHINE, J NAU, M MINNA, JD TI NONRANDOM STRUCTURAL AND NUMERICAL CHROMOSOME CHANGES IN NON-SMALL-CELL LUNG-CANCER SO GENES CHROMOSOMES & CANCER LA English DT Article ID MYC GENE FAMILY; K-RAS ONCOGENE; CYTOGENETIC ABNORMALITIES; SHORT ARM; MALIGNANT MESOTHELIOMA; BANDING-PATTERNS; DNA-SEQUENCE; WILMS-TUMOR; CARCINOMA; EXPRESSION AB Cytogenetic studies were performed on 27 tumor cell lines (most of which were derived from metastatic lesions) and four fresh malignant pleural and pericardial effusions from 30 patients with non-small-cell lung cancer (non-SCLC). Many clonal structural (deletions and nonreciprocal translocations) and numerical abnormalities were found in each specimen. Statistical analysis revealed these changes were nonrandomly distributed among the chromosomes. A statistically significant number of chromosomal breakpoints were seen in regions 1q1, 1q3, 3p1, 3p2, 3q1, 3q2, 7q1, 13p1, 14p1, 15p1, and 17q1 when the regions were compared to the total haploid complement. In addition, when a given region was compared to other regions within the same chromosome, statistically significant numbers of breakpoints were noted for regions 1q3, 5q1, 7q1, 13p1, 14p1, 15p1, 16q2, 17q1, and 21p1. Specific chromosome bands showing the most frequent involvement in structural abnormalities were (in descending order) 3p14.2, 3q21, 19q13, 11p15, 1q11, 7q11, 1q21, 3p23, and 3p21. The breakpoints indicate areas to look for new dominant oncogenes activated by translocations, while the areas of deletions and loss of material by nonreciprocal translocations highlight areas to search for recessive oncogenes. These cytogenetic studies represent strong evidence that multiple genetic lesions are associated with the development of metastatic lung cancer, and provide a roadmap to search for new genes involved in the pathogenesis of lung cancer. C1 UNIFORMED SERV UNIV HLTH SCI,BETHESDA,MD 20814. NCI,DIV CANC TREATMENT,COP,BIOSTAT & DATA MANAGEMENT SECT,BETHESDA,MD 20892. NCI,MED BRANCH,BETHESDA,MD 20892. NCI,USN,MED ONCOL BRANCH,BETHESDA,MD 20892. NR 79 TC 108 Z9 108 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 1045-2257 J9 GENE CHROMOSOME CANC JI Gene Chromosomes Cancer PD MAY PY 1991 VL 3 IS 3 BP 168 EP 188 DI 10.1002/gcc.2870030303 PG 21 WC Oncology; Genetics & Heredity SC Oncology; Genetics & Heredity GA FR181 UT WOS:A1991FR18100002 PM 1651103 ER PT J AU DIAZ, DD KENNEDY, KS PARKER, GS WHITE, VJ AF DIAZ, DD KENNEDY, KS PARKER, GS WHITE, VJ TI SCHWANNOMA OF THE SUBMANDIBULAR-GLAND SO HEAD AND NECK-JOURNAL FOR THE SCIENCES AND SPECIALTIES OF THE HEAD AND NECK LA English DT Article ID TUMORS; HEAD; NECK AB Neurilemmomas (schwannomas) are solitary neurogenic tumors that arise from cells of the neural sheath. They are slow growing and represent a proliferation of Schwann cells. Extracranial neurogenic tumors of the head and neck are uncommon, with benign tumors occurring with greater frequency than malignant tumors. These tumors often mimic primary or metastatic disease in the head and neck. Schwannoma of the salivary gland is a particularly rare form of an extracranial neurogenic tumor, with most presenting in the parotid gland originating from a peripheral branch of the facial nerve. An unusual case of neurilemmoma of the submandibular gland is presented, and the literature concerning this subject is reviewed. We believe this tumor originated in an autonomic nerve of the submandibular gland. The mass was discrete and well demonstrated on CT scan. Total excision of the gland resulted in complete resolution of symptoms with no cranial nerve deficits. C1 USN,DEPT OTOLARYNGOL HEAD & NECK SURG,PORTSMOUTH,VA 23708. EASTERN VIRGINIA MED SCH,NORFOLK,VA 23501. UNIFORMED SERV UNIV HLTH SCI,F EDWARD HEBERT SCH MED,DEPT SURG,BETHESDA,MD 20814. USN,DEPT PATHOL,PORTSMOUTH,VA 23708. NR 13 TC 11 Z9 11 U1 0 U2 1 PU JOHN WILEY & SONS INC PI NEW YORK PA 605 THIRD AVE, NEW YORK, NY 10158-0012 SN 1043-3074 J9 HEAD NECK-J SCI SPEC JI Head Neck-J. Sci. Spec. Head Neck PD MAY-JUN PY 1991 VL 13 IS 3 BP 239 EP 242 DI 10.1002/hed.2880130314 PG 4 WC Otorhinolaryngology; Surgery SC Otorhinolaryngology; Surgery GA FH328 UT WOS:A1991FH32800013 PM 2037477 ER PT J AU ROSENBLUM, LJ NIELSON, GM AF ROSENBLUM, LJ NIELSON, GM TI GUEST EDITORS INTRODUCTION - VISUALIZATION COMES OF AGE SO IEEE COMPUTER GRAPHICS AND APPLICATIONS LA English DT Article C1 ARIZONA STATE UNIV,DEPT COMP SCI,TEMPE,AZ 85287. RP ROSENBLUM, LJ (reprint author), USN,RES LAB,SIGNAL PROC BRANCH,WASHINGTON,DC 20375, USA. NR 4 TC 5 Z9 5 U1 0 U2 0 PU IEEE COMPUTER SOC PI LOS ALAMITOS PA 10662 LOS VAQUEROS CIRCLE, PO BOX 3014, LOS ALAMITOS, CA 90720-1264 SN 0272-1716 J9 IEEE COMPUT GRAPH JI IEEE Comput. Graph. Appl. PD MAY PY 1991 VL 11 IS 3 BP 15 EP 17 PG 3 WC Computer Science, Software Engineering SC Computer Science GA FL270 UT WOS:A1991FL27000007 ER PT J AU BOWMAN, SR WININGS, MJ SEARLES, S FELDMAN, BJ AF BOWMAN, SR WININGS, MJ SEARLES, S FELDMAN, BJ TI SHORT-PULSED 2.1-MU-M LASER PERFORMANCE OF CR,TM,HO-YAG SO IEEE JOURNAL OF QUANTUM ELECTRONICS LA English DT Letter ID YAG; HO AB We report the results of rapid multiple-pulsed Q-switching experiments in near room temperature flashlamp-pumped 2.1-mu-m Cr,Tm,Ho:YAG lasers. The recovery of the laser gain after the initial Q-switched pulse was determined, as well as the spectrum of the short pulses. RP BOWMAN, SR (reprint author), USN,RES LAB,LASER PHYS BRANCH,CODE 6540,WASHINGTON,DC 20375, USA. RI Winings, Michael/A-4924-2010 NR 10 TC 21 Z9 26 U1 1 U2 5 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0018-9197 J9 IEEE J QUANTUM ELECT JI IEEE J. Quantum Electron. PD MAY PY 1991 VL 27 IS 5 BP 1129 EP 1131 DI 10.1109/3.83365 PG 3 WC Engineering, Electrical & Electronic; Optics; Physics, Applied SC Engineering; Optics; Physics GA FW125 UT WOS:A1991FW12500005 ER PT J AU STEINER, M AF STEINER, M TI A MINIMAX APPROACH TO THE DESIGN OF DOPPLER FILTERS SO IEEE TRANSACTIONS ON AEROSPACE AND ELECTRONIC SYSTEMS LA English DT Article AB The detection of a target in correlated clutter, thermal noise, and extraneous interference is considered. The amplitude, phase, and Doppler frequency of the signal are not known a priori. A general criterion is presented which measures the performance of a suboptimal test relative to an optimal test. This criterion is encompassed into a design procedure used to design Doppler filters. The procedure allows many design considerations to be taken into account, and results in a design which attempts to minimize the number of filters required. For low dimensionality the procedure results in single filter designs; for higher dimensionality multiple filters are designed. The performance of these systems are compared with the results obtained by Emerson and Andrews. It is found that the procedure yields good filter designs under general conditions and furthermore may reduce the number of filters required compared with classical designs. RP STEINER, M (reprint author), USN,RES LAB,DIV RADAR,CODE 53401M,WASHINGTON,DC 20375, USA. OI Steiner, Michael/0000-0003-3199-0935 NR 15 TC 2 Z9 2 U1 0 U2 0 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0018-9251 J9 IEEE T AERO ELEC SYS JI IEEE Trans. Aerosp. Electron. Syst. PD MAY PY 1991 VL 27 IS 3 BP 481 EP 486 DI 10.1109/7.81429 PG 6 WC Engineering, Aerospace; Engineering, Electrical & Electronic; Telecommunications SC Engineering; Telecommunications GA FU364 UT WOS:A1991FU36400007 ER PT J AU MILLER, LS BROWN, GS CHOY, LW AF MILLER, LS BROWN, GS CHOY, LW TI MULTIBEAM RADAR ALTIMETRY - SPACEBORNE FEASIBILITY SO IEEE TRANSACTIONS ON GEOSCIENCE AND REMOTE SENSING LA English DT Note AB An analysis of the inherent height and spatial resolution of an off-nadir radar altimeter is presented. For the general case, mean-square height uncertainty is shown to be proportional to the cross-track beamwidth divided by the along-track beamwidth. Thus the cross-track beamwidth should be minimized, and the along-track beamwidth maximized, subject to resolution and other constraints. A pure multibeam system with a 50-km beam offset, and altitude of 800 km, a 13.5-GHZ frequency, and a 4.5-m diameter antenna is found to yield a height random error of less than 5 cm. For the same conditions, errors decrease with increasing frequency; however, rain attenuation becomes a factor. C1 VIRGINIA POLYTECH INST & STATE UNIV,DEPT ELECT ENGN,BLACKSBURG,VA 24060. USN,RES LAB,CTR ADV SPACE SENSING,WASHINGTON,DC 20375. RP MILLER, LS (reprint author), CLEMSON UNIV,DEPT PHYS & ASTRON,KINARD LAB PHYS,CLEMSON,SC 29630, USA. NR 15 TC 2 Z9 2 U1 0 U2 0 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0196-2892 J9 IEEE T GEOSCI REMOTE JI IEEE Trans. Geosci. Remote Sensing PD MAY PY 1991 VL 29 IS 3 BP 465 EP 469 DI 10.1109/36.79438 PG 5 WC Geochemistry & Geophysics; Engineering, Electrical & Electronic; Remote Sensing; Imaging Science & Photographic Technology SC Geochemistry & Geophysics; Engineering; Remote Sensing; Imaging Science & Photographic Technology GA FK385 UT WOS:A1991FK38500014 ER PT J AU PURDY, AP GEORGE, CF AF PURDY, AP GEORGE, CF TI VOLATILE COPPER AND BARIUM COPPER ALKOXIDES - CRYSTAL-STRUCTURE OF A TRICOORDINATE COPPER(II) COMPLEX, BA(CU[OCME(CF3)2]3)2 SO INORGANIC CHEMISTRY LA English DT Letter ID YBA2CU3O7-X; PRECURSOR; BA C1 USN,RES LAB,STRUCT MATTER LAB,CODE 6030,WASHINGTON,DC 20375. SFA INC,LANDOVER,MD 20785. NR 20 TC 49 Z9 49 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 MAY 1 PY 1991 VL 30 IS 9 BP 1969 EP 1970 DI 10.1021/ic00009a003 PG 2 WC Chemistry, Inorganic & Nuclear SC Chemistry GA FK180 UT WOS:A1991FK18000003 ER PT J AU WALTERS, RJ SUMMERS, GP AF WALTERS, RJ SUMMERS, GP TI DEEP LEVEL TRANSIENT SPECTROSCOPY STUDY OF PROTON IRRADIATED P-TYPE INP SO JOURNAL OF APPLIED PHYSICS LA English DT Article ID INDUCED DISPLACEMENT DAMAGE; RADIATION-DAMAGE; SOLAR-CELLS; ENERGY-DEPENDENCE; INDUCED DEFECTS; ELECTRON; SILICON; TRANSFORMATION; RECOMBINATION; RESISTANCE AB A deep level transient spectroscopy study of proton irradiation induced defects in n + p InP mesa diodes grown by metalorganic chemical vapor deposition is reported. In contrast to results reported for InP grown by other methods, 3 MeV proton irradiation produced a DLTS spectrum similar to 1 MeV electron irradiation with the addition of two new peaks. Six majority carrier peaks: HP1(E(a) = 0.15 eV), H2 (E(a) = 0.20 eV), H3(E(a) = 0.30 eV), H4(E(a) = 0.37 eV), H5(E(a) = 0.54 eV), and H7(E(a) = 0.16 eV) and three minority carrier peaks: EA(E(a) = 0.26 eV), EB(E(a) = 0.74 eV), and EC(E(a) = 0.16 eV) were detected. The H5 peak displayed a thermally activated capture cross section and a dependence of peak height on injection level. Isothermal annealing at 375 K was performed and thermal annealing rates are presented. Low temperature (200 K), minority carrier injection annealing rates are also presented. For most of the defects, a significant residual concentration remained after injection which could not be annealed further. An equation was developed for the annealing rate of the major defect, H4, as a function of injection level, carrier concentration, and temperature. C1 USN,RES LAB,WASHINGTON,DC 20375. UNIV MARYLAND,DEPT PHYS,CATONSVILLE,MD 21228. RP WALTERS, RJ (reprint author), SFA INC,LANDOVER,MD 20785, USA. NR 28 TC 24 Z9 24 U1 0 U2 4 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0021-8979 J9 J APPL PHYS JI J. Appl. Phys. PD MAY 1 PY 1991 VL 69 IS 9 BP 6488 EP 6494 DI 10.1063/1.348856 PG 7 WC Physics, Applied SC Physics GA FM171 UT WOS:A1991FM17100038 ER PT J AU GOLD, SH KIRKPATRICK, DA FLIFLET, AW MCCOWAN, RB KINKEAD, AK HARDESTY, DL SUCY, M AF GOLD, SH KIRKPATRICK, DA FLIFLET, AW MCCOWAN, RB KINKEAD, AK HARDESTY, DL SUCY, M TI HIGH-VOLTAGE MILLIMETER-WAVE GYRO-TRAVELING-WAVE AMPLIFIER SO JOURNAL OF APPLIED PHYSICS LA English DT Article ID FREE-ELECTRON LASER; CYCLOTRON-RESONANCE MASER; ABSOLUTE INSTABILITY; GAIN; BEAM AB An intense-beam gyro-traveling-wave amplifier experiment has demonstrated an apparent growth rate of 2.2 dB/cm at 35 GHz, with total gain exceeding 30 dB, and an output power of approximately 20 MW (+/- 3 dB), corresponding to an efficiency of approximately 11%. RP GOLD, SH (reprint author), USN,RES LAB,DIV PLASMA PHYS,BEAM PHYS BRANCH,WASHINGTON,DC 20375, USA. NR 15 TC 15 Z9 15 U1 0 U2 1 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0021-8979 J9 J APPL PHYS JI J. Appl. Phys. PD MAY 1 PY 1991 VL 69 IS 9 BP 6696 EP 6698 DI 10.1063/1.348888 PG 3 WC Physics, Applied SC Physics GA FM171 UT WOS:A1991FM17100070 ER PT J AU MOORE, WJ SHANABROOK, BV AF MOORE, WJ SHANABROOK, BV TI THE EFFECT OF CHARGE STATE ON THE LOCAL VIBRATIONAL-MODE ABSORPTION OF THE CARBON ACCEPTOR IN SEMI-INSULATING GAAS - COMMENT SO JOURNAL OF APPLIED PHYSICS LA English DT Letter AB A recent study of the effect of photoquenching of EL2 on the compensation of carbon acceptors in GaAs and the resulting effect on the carbon local vibrational mode, LVM, concluded that there was no broadening of the LVM associated with bound holes on neutral carbon acceptors. The failure to observe broadening of the LVM in this study was a result of the failure to neutralize a significant fraction of the carbon atoms by photoquenching EL2. We show that, in the experiment reported, at most only about 3%-4% of the carbon acceptors were neutralized. Such very small modifications of the ionized carbon concentration are unobservable in the LVM spectra unless the spectral stability and signal-to-noise ratio are exceptional. RP MOORE, WJ (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 4 TC 1 Z9 1 U1 0 U2 0 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0021-8979 J9 J APPL PHYS JI J. Appl. Phys. PD MAY 1 PY 1991 VL 69 IS 9 BP 6731 EP 6732 DI 10.1063/1.348898 PG 2 WC Physics, Applied SC Physics GA FM171 UT WOS:A1991FM17100082 ER PT J AU JONES, RL AF JONES, RL TI OXIDE ACID-BASE REACTIONS RELATING TO THE INHIBITION OF VANADIUM ATTACK ON REY ZEOLITE CATALYSTS SO JOURNAL OF CATALYSIS LA English DT Article ID FLUID CRACKING CATALYSTS; LUMINESCENCE RP USN, RES LAB, DIV CHEM, WASHINGTON, DC 20375 USA. NR 18 TC 7 Z9 7 U1 0 U2 0 PU ACADEMIC PRESS INC ELSEVIER SCIENCE PI SAN DIEGO PA 525 B ST, STE 1900, SAN DIEGO, CA 92101-4495 USA SN 0021-9517 EI 1090-2694 J9 J CATAL JI J. Catal. PD MAY PY 1991 VL 129 IS 1 BP 269 EP 274 DI 10.1016/0021-9517(91)90029-4 PG 6 WC Chemistry, Physical; Engineering, Chemical SC Chemistry; Engineering GA FG050 UT WOS:A1991FG05000028 ER PT J AU CANAVAN, L OSBORN, RE AF CANAVAN, L OSBORN, RE TI DURAL SINUS AIR WITHOUT HEAD TRAUMA OR SURGERY - CT DEMONSTRATION SO JOURNAL OF COMPUTER ASSISTED TOMOGRAPHY LA English DT Article ID COMPUTERIZED-TOMOGRAPHY; EMBOLISM C1 CHILDRENS MEM HOSP,DEPT RADIOL,2300 CHILDRENS PLAZA,CHICAGO,IL 60614. USN HOSP,DEPT RADIOL,SAN DIEGO,CA 92134. NORTHWESTERN UNIV,SCH MED,DEPT RADIOL,CHICAGO,IL 60611. NR 8 TC 24 Z9 26 U1 0 U2 0 PU LIPPINCOTT-RAVEN PUBL PI PHILADELPHIA PA 227 EAST WASHINGTON SQ, PHILADELPHIA, PA 19106 SN 0363-8715 J9 J COMPUT ASSIST TOMO JI J. Comput. Assist. Tomogr. PD MAY-JUN PY 1991 VL 15 IS 3 BP 526 EP 527 PG 2 WC Radiology, Nuclear Medicine & Medical Imaging SC Radiology, Nuclear Medicine & Medical Imaging GA FM318 UT WOS:A1991FM31800041 PM 2026828 ER PT J AU YOUNGDALE, ER MEYER, JR HOFFMAN, CA BARTOLI, FJ PARTIN, DL THRUSH, CM HEREMANS, JP AF YOUNGDALE, ER MEYER, JR HOFFMAN, CA BARTOLI, FJ PARTIN, DL THRUSH, CM HEREMANS, JP TI STRONG NONLINEAR OPTICAL ENHANCEMENT IN MBE-GROWN BI1-XSBX SO JOURNAL OF CRYSTAL GROWTH LA English DT Article; Proceedings Paper CT 6TH INTERNATIONAL CONF ON MOLECULAR BEAM EPITAXY CY AUG 27-31, 1990 CL UNIV CALIF SAN DIEGO, LA JOLLA, CA HO UNIV CALIF SAN DIEGO ID COEFFICIENTS; FILMS AB We report an experimental study of the linear and nonlinear optical properties of Bi1-xSb(x) alloy layers grown by MBE. Non-degenerate four-wave mixing experiments at CO2 laser wavelengths yield a large third-order nonlinear susceptibility (chi-(3) almost-equal-to 3.5 x 10(-4) esu). Furthermore, due to the high reflectivity of the Bi1-xSb(x) films at both the air and substrate interfaces, the etalon formed can enhance the nonlinear optical signal by over an order of magnitude. C1 GM CORP,RES LABS,DEPT PHYS,WARREN,MI 48090. RP YOUNGDALE, ER (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 11 TC 3 Z9 5 U1 1 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0022-0248 J9 J CRYST GROWTH JI J. Cryst. Growth PD MAY PY 1991 VL 111 IS 1-4 BP 693 EP 697 DI 10.1016/0022-0248(91)91065-I PG 5 WC Crystallography; Materials Science, Multidisciplinary; Physics, Applied SC Crystallography; Materials Science; Physics GA FT190 UT WOS:A1991FT19000129 ER EF