FN Thomson Reuters Web of Science™ VR 1.0 PT J AU FRANKEL, MY WHITAKER, JF MOUROU, GA AF FRANKEL, MY WHITAKER, JF MOUROU, GA TI OPTOELECTRONIC TRANSIENT CHARACTERIZATION OF ULTRAFAST DEVICES SO IEEE JOURNAL OF QUANTUM ELECTRONICS LA English DT Article ID COPLANAR TRANSMISSION-LINES; ELECTROOPTIC SAMPLING SYSTEM; MOLECULAR-BEAM EPITAXY; MOBILITY TRANSISTOR; ELECTRICAL PULSES; PICOSECOND; DISPERSION; PROPAGATION; MODULATION; GENERATION AB This paper discusses recent advances in state-of-the-art optoelectronic techniques applied to areas pertinent to transistor small-signal and large-signal characterization. First, the aspects of optoelectronic techniques for electrical signal measurement, generation, and transmission are studied. Second, based on these results, a large-signal digital-switching transistor characterization methodology is developed. Specifically, this methodology is used to estimate the parameters of a high electron mobility transistor and to obtain the large-signal characteristics of this device on a picosecond time scale. The measurements are then compared to a SPICE-based time-domain model. Third, the time-domain measurement technique is then extended to obtain two-port frequency-domain characteristics of another, similar transistor with 100 GHz bandwidth. These results compare favorably to conventional HP8510 network analyzer measurements over a common frequency span of 40 GHz. C1 UNIV MICHIGAN,CTR ULTRAFAST OPT SCI,ANN ARBOR,MI 48109. RP FRANKEL, MY (reprint author), USN,RES LAB,DIV OPT SCI,CODE 6572,WASHINGTON,DC 20375, USA. NR 49 TC 56 Z9 56 U1 0 U2 4 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0018-9197 J9 IEEE J QUANTUM ELECT JI IEEE J. Quantum Electron. PD OCT PY 1992 VL 28 IS 10 BP 2313 EP 2324 DI 10.1109/3.159538 PG 12 WC Engineering, Electrical & Electronic; Optics; Physics, Applied SC Engineering; Optics; Physics GA JQ975 UT WOS:A1992JQ97500037 ER PT J AU HOWERTON, MM MOELLER, RP BULMER, CH BURNS, WK AF HOWERTON, MM MOELLER, RP BULMER, CH BURNS, WK TI USE OF A DOUBLY POLARIZED LASER FOR REMOTE POWERING OF AN INTEGRATED OPTICAL MODULATOR SO IEEE PHOTONICS TECHNOLOGY LETTERS LA English DT Article AB Stable operation of an integrated optic modulator is demonstrated using a 1.3 mum doubly polarized laser as a depolarized source in conjunction with a long run of ordinary fiber. The laser is found to be unusually susceptible to feedback due to gain competition between the polarization modes. The resulting low-frequency polarization noise is significantly reduced by the addition of fiber isolators to the system. C1 USN,RES LAB,WASHINGTON,DC 20375. RP HOWERTON, MM (reprint author), SFA INC,LANDOVER,MD 20785, USA. NR 6 TC 1 Z9 1 U1 0 U2 1 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 1041-1135 J9 IEEE PHOTONIC TECH L JI IEEE Photonics Technol. Lett. PD OCT PY 1992 VL 4 IS 10 BP 1127 EP 1129 DI 10.1109/68.163754 PG 3 WC Engineering, Electrical & Electronic; Optics; Physics, Applied SC Engineering; Optics; Physics GA JU730 UT WOS:A1992JU73000016 ER PT J AU KERSEY, AD BERKOFF, TA AF KERSEY, AD BERKOFF, TA TI FIBEROPTIC BRAGG-GRATING DIFFERENTIAL-TEMPERATURE SENSOR SO IEEE PHOTONICS TECHNOLOGY LETTERS LA English DT Article AB We describe a differential temperature sensor based on fiber-optic Bragg-grating elements. A high sensitivity to thermally induced Bragg wavelength shifts is obtained using an interferometric detection approach. Results presented show a temperature resolution of < 0.05-degrees-C, corresponding to a Bragg wavelength shift resolution of < 6 x 10(-4) nm. RP KERSEY, AD (reprint author), USN,RES LAB,OPT TECH BRANCH,CODE 6574,WASHINGTON,DC 20375, USA. NR 5 TC 67 Z9 71 U1 1 U2 6 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 1041-1135 J9 IEEE PHOTONIC TECH L JI IEEE Photonics Technol. Lett. PD OCT PY 1992 VL 4 IS 10 BP 1183 EP 1185 DI 10.1109/68.163773 PG 3 WC Engineering, Electrical & Electronic; Optics; Physics, Applied SC Engineering; Optics; Physics GA JU730 UT WOS:A1992JU73000035 ER PT J AU LAM, AW OZLUTURK, FM AF LAM, AW OZLUTURK, FM TI PERFORMANCE BOUNDS FOR DS SSMA COMMUNICATIONS WITH COMPLEX SIGNATURE SEQUENCES SO IEEE TRANSACTIONS ON COMMUNICATIONS LA English DT Article ID MULTIPLE-ACCESS COMMUNICATIONS; SPREAD-SPECTRUM; CROSS-CORRELATION AB This paper presents an unified performance analysis of direct-sequence spread-spectrum multiple-access (DS/SSMA) communications with deterministic complex signature sequences. The probability density function (pdf) of the multiple-user interference is determined. Using a round-down and round-up procedure on the pdf, arbitrarily tight lower and upper bounds on the probability of bit error (pbe) are obtained. Results based on the Gaussian approximation method are also presented. It is shown that complex sequences can yield better pbe performance than binary sequences. Using complex sequences, the number of signature sequences that have good auto- and crosscorrelation properties is greatly enlarged. New users that employ complex or binary signature sequences can be added into existing systems with graceful performance degradation. C1 UNIV MASSACHUSETTS,DEPT ELECT & COMP ENGN,AMHERST,MA 01003. RP LAM, AW (reprint author), USN,POSTGRAD SCH,DEPT ELECT & COMP ENGN,MONTEREY,CA 93943, USA. NR 17 TC 31 Z9 31 U1 0 U2 0 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0090-6778 J9 IEEE T COMMUN JI IEEE Trans. Commun. PD OCT PY 1992 VL 40 IS 10 BP 1607 EP 1614 DI 10.1109/26.168791 PG 8 WC Engineering, Electrical & Electronic; Telecommunications SC Engineering; Telecommunications GA JZ260 UT WOS:A1992JZ26000010 ER PT J AU KLEGKA, J DRIELS, M AF KLEGKA, J DRIELS, M TI ANALYSIS OF A CONCEPTUAL AUTOMATED REWORK FACILITY FOR PRINTED WIRING ASSEMBLY MANUFACTURING SYSTEMS SO IEEE TRANSACTIONS ON COMPONENTS HYBRIDS AND MANUFACTURING TECHNOLOGY LA English DT Article AB In this paper an analysis of a conceptual automated rework facility for use in a printed wiring assembly (PWA) manufacturing system is presented. The current manual rework system is considered as well as a conceptual automated rework facility. The total cost of rework is decomposed into a diagnostic cost and a rework cost. The reduction of this total cost is the goal of the automated facility. C1 USN,POSTGRAD SCH,DEPT MECH ENGN,MONTEREY,CA 93943. RP KLEGKA, J (reprint author), US MIL ACAD,DEPT CIVIL & MECH ENGN,W POINT,NY 10996, USA. NR 38 TC 0 Z9 0 U1 0 U2 0 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0148-6411 J9 IEEE T COMPON HYBR PD OCT PY 1992 VL 15 IS 5 BP 876 EP 883 DI 10.1109/33.180054 PG 8 WC Engineering, Manufacturing; Engineering, Electrical & Electronic; Materials Science, Multidisciplinary SC Engineering; Materials Science GA KD698 UT WOS:A1992KD69800033 ER PT J AU CHRISTOU, A TANG, PF HU, JM AF CHRISTOU, A TANG, PF HU, JM TI DUAL FUNCTIONAL DISTRIBUTION OF FAILURE IN GAAS MULTICHIP MICROWAVE MONOLITHIC INTEGRATED-CIRCUITS (MMICS) SO IEEE TRANSACTIONS ON ELECTRON DEVICES LA English DT Article AB A definitive separation of bimodal failure distribution functions for MMIC's has been obtained as a result of microwave accelerated life testing. The circuit which was a 2-8-GHz monolithic amplifier showed a very strong early failure pattern related only to passive component degradation. Using the concept of multifunctional distribution it was possible to separate the early failure pattern and to relate it to degradation of the off-chip capacitors. The main failure distribution was related to gate and ohmic contact electromigration of the MMIC active components. If the data analysis included the early failures, a mean time to failure (MTF) of less then 1 x 10(5) h has been obtained. C1 USN,RES LAB,WASHINGTON,DC 20375. RP CHRISTOU, A (reprint author), UNIV MARYLAND,CALCE ELECTR PACKAGING RES CTR,COLL PK,MD 20742, USA. NR 18 TC 1 Z9 1 U1 0 U2 0 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0018-9383 J9 IEEE T ELECTRON DEV JI IEEE Trans. Electron Devices PD OCT PY 1992 VL 39 IS 10 BP 2229 EP 2234 DI 10.1109/16.158792 PG 6 WC Engineering, Electrical & Electronic; Physics, Applied SC Engineering; Physics GA JP308 UT WOS:A1992JP30800006 ER PT J AU DUDECK, KE BUCKLEY, LJ AF DUDECK, KE BUCKLEY, LJ TI DIELECTRIC MATERIAL MEASUREMENT OF THIN SAMPLES AT MILLIMETER WAVELENGTHS SO IEEE TRANSACTIONS ON INSTRUMENTATION AND MEASUREMENT LA English DT Letter AB Complex permittivity and permeability measurements at millimeter wave frequencies of thin samples (0.12 to 1.0 mm) were obtained. The methodology and considerations for making automated waveguide material measurements of thin samples in the 26.5 to 40 GHz (R-Band) frequency range are described herein. Measurement results for various dielectric materials are included. C1 USN,CTR AIR DEV,WARMINSTER,PA 18974. RP DUDECK, KE (reprint author), PENN STATE UNIV,HAZLETON CAMPUS,HAZLETON,PA 18201, USA. NR 11 TC 12 Z9 12 U1 0 U2 0 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0018-9456 J9 IEEE T INSTRUM MEAS JI IEEE Trans. Instrum. Meas. PD OCT PY 1992 VL 41 IS 5 BP 723 EP 725 DI 10.1109/19.177352 PG 3 WC Engineering, Electrical & Electronic; Instruments & Instrumentation SC Engineering; Instruments & Instrumentation GA JZ107 UT WOS:A1992JZ10700027 ER PT J AU FREUND, HP KODIS, MA VANDERPLAATS, NR AF FREUND, HP KODIS, MA VANDERPLAATS, NR TI SELF-CONSISTENT FIELD-THEORY OF A HELIX TRAVELING-WAVE TUBE AMPLIFIER SO IEEE TRANSACTIONS ON PLASMA SCIENCE LA English DT Article ID FREE-ELECTRON LASER AB A self-consistent relativistic field theory of a helix traveling wave tube (TWT) is presented for a configuration in which a thin annular beam propagates through a sheath helix enclosed within a loss-free wall. A linear analysis of the interaction is solved subject to the boundary conditions imposed by the beam, helix, and wall. A determinantal dispersion equation is obtained which implicitly includes beam space-charge effects without recourse to a heuristic model of the space-charge field. This dispersion equation is valid for arbitrary azimuthal mode number, and is solved numerically for the azimuthally symmetric case. The coupled-wave Pierce theory is recovered in the near-resonant limit. Numerical comparisons between the complete dispersion equation and the Pierce model are described. The ballistic and space-charge dominated regimes of the Pierce analysis, in which the gain scales as the cube and fourth root of the current respectively, are addressed explicitly. A discrepancy is found between the Pierce and the field theory even for low currents in the nominally ballistic regime. This arises from the dielectric effect of the beam on the helix modes, which can result in the gain increasing faster than the cube root of the current. RP FREUND, HP (reprint author), USN,RES LAB,VACUUM ELECTR BRANCH,WASHINGTON,DC 20375, USA. NR 13 TC 56 Z9 57 U1 1 U2 4 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0093-3813 J9 IEEE T PLASMA SCI JI IEEE Trans. Plasma Sci. PD OCT PY 1992 VL 20 IS 5 BP 543 EP 553 DI 10.1109/27.163592 PG 11 WC Physics, Fluids & Plasmas SC Physics GA JU792 UT WOS:A1992JU79200009 ER PT J AU SHENSA, MJ AF SHENSA, MJ TI THE DISCRETE WAVELET TRANSFORM - WEDDING THE A TROUS AND MALLAT ALGORITHMS SO IEEE TRANSACTIONS ON SIGNAL PROCESSING LA English DT Article ID ORTHONORMAL BASES; SIGNAL AB In a general sense this paper represents an effort to clarify the relationship of discrete and continuous wavelet transforms. More narrowly, it focuses on bringing together two separately motivated implementations of the wavelet transform, the algorithme a trous and Mallat's multiresolution decomposition. It is observed that these algorithms are both special cases of a single filter bank structure, the discrete wavelet transform, the behavior of which is governed by one's choice of filters. In fact, the a trous algorithm, originally devised as a computationally efficient implementation, is more properly viewed as a nonorthonormal multiresolution algorithm for which the discrete wavelet transform is exact. Moreover, it is shown that the commonly used Lagrange a trous filters are in one-to-one correspondence with the convolutional squares of the Daubechies filters for orthonormal wavelets of compact support. A systematic framework for the discrete wavelet transform is provided, and conditions are derived under which it computes the continuous wavelet transform exactly. Suitable filter constraints for finite energy and boundedness of the discrete transform are also derived. Finally, relevant signal processing parameters are examined, and it is remarked that orthonormality is balanced by restrictions on resolution. RP SHENSA, MJ (reprint author), USN,CTR OCEAN SYST,SAN DIEGO,CA 92152, USA. NR 30 TC 734 Z9 825 U1 3 U2 39 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 1053-587X J9 IEEE T SIGNAL PROCES JI IEEE Trans. Signal Process. PD OCT PY 1992 VL 40 IS 10 BP 2464 EP 2482 DI 10.1109/78.157290 PG 19 WC Engineering, Electrical & Electronic SC Engineering GA JQ504 UT WOS:A1992JQ50400008 ER PT J AU MANHEIMER, WM AF MANHEIMER, WM TI APPLICATION OF GYROTRONS TO HIGH-POWER MILLIMETER-WAVE DOPPLER RADARS SO INTERNATIONAL JOURNAL OF INFRARED AND MILLIMETER WAVES LA English DT Article AB Gyrotrons are currently the highest power millimeter wave source. The power level currently available is more than sufficient for almost any radar application. However the fact that gyrotrons exist as free running oscillators is thought to restrict their application to Doppler radars. This paper shows that with enhanced data processing at the receiver, many Doppler radar functions become possible. RP MANHEIMER, WM (reprint author), USN,RES LAB,DIV PLASMA PHYS,CODE 4707,WASHINGTON,DC 20375, USA. NR 0 TC 1 Z9 1 U1 0 U2 0 PU PLENUM PUBL CORP PI NEW YORK PA 233 SPRING ST, NEW YORK, NY 10013 SN 0195-9271 J9 INT J INFRARED MILLI JI Int. J. Infrared Millimeter Waves PD OCT PY 1992 VL 13 IS 10 BP 1449 EP 1457 DI 10.1007/BF01009229 PG 9 WC Engineering, Electrical & Electronic; Optics; Physics, Applied SC Engineering; Optics; Physics GA JQ638 UT WOS:A1992JQ63800001 ER PT J AU NGAI, KL AF NGAI, KL TI STRUCTURAL RELAXATION AND CONDUCTIVITY RELAXATION IN GLASSY IONICS SO JOURNAL DE PHYSIQUE IV LA English DT Article; Proceedings Paper CT EUROPEAN WORKSHOP ON GLASSES AND GELS CY JAN 29-31, 1992 CL FRANCE SP CNRS, UNIV MONTPELLIER 2, SOC FRANCAISE CHIM, SOLID STATE DIV, ST GOBAIN ID NUCLEAR-SPIN RELAXATION; CORRELATED SYSTEMS; MODEL; CONDUCTORS; DIFFUSION AB The coupling model was proposed to describe relaxations in complex correlated systems of which ionic conducting glass is a special case. The model is capable of explaining both the structural and the conductivity relaxations of ionic conducting glasses. Recent results from Monte Carlo simulations of ionic motion in glasses are shown to be in total agreement with the predictions of the coupling model. Experimental data from nuclear spin relaxation in poor ionic conductors and quasielastic neutron scattering in fast ionic conductors provide also strong support for the validity of the coupling model. A correlation between the stretch exponent of conductivity relaxation with the decoupling index proposed by Angell is discussed in the light of the coupling model. RP NGAI, KL (reprint author), USN,RES LAB,DIV ELECTR SCI & TECHNOL,WASHINGTON,DC 20375, USA. NR 26 TC 41 Z9 41 U1 0 U2 4 PU EDITIONS PHYSIQUE PI LES ULIS CEDEX PA Z I DE COURTABOEUF AVE 7 AV DU HOGGAR, BP 112, 91944 LES ULIS CEDEX, FRANCE SN 1155-4339 J9 J PHYS IV JI J. Phys. IV PD OCT PY 1992 VL 2 IS C2 BP 61 EP 73 DI 10.1051/jp4:1992207 PG 13 WC Physics, Multidisciplinary SC Physics GA KN481 UT WOS:A1992KN48100008 ER PT J AU ESTALJI, S KUCHLER, R KANERT, O BOLTER, R JAIN, H NGAI, KL AF ESTALJI, S KUCHLER, R KANERT, O BOLTER, R JAIN, H NGAI, KL TI NUCLEAR-MAGNETIC-RESONANCE AND IONIC MOTION IN FLUOROZIRCONATE GLASSES SO JOURNAL DE PHYSIQUE IV LA English DT Article; Proceedings Paper CT EUROPEAN WORKSHOP ON GLASSES AND GELS CY JAN 29-31, 1992 CL FRANCE SP CNRS, UNIV MONTPELLIER 2, SOC FRANCAISE CHIM, SOLID STATE DIV, ST GOBAIN ID SPIN RELAXATION; CONDUCTIVITY AB We have determined NMR linewidths and nuclear spin relaxation rates for F-19, Li-7, and Na-23 nuclei. and electrical conductivity in ZrF4-based fluoride glasses as a function of temperature. The results indicate that both Li and F are mobile in the glass containing 20 mole% LiF, whereas only F is mobile in glasses containing NaF (up to 30 mole%) or no alkali ions. Finally we compare and discuss the activation energies for the various parameters. C1 LEHIGH UNIV,DEPT MAT SCI & ENGN,BETHLEHEM,PA 18015. USN,RES LAB,WASHINGTON,DC 20375. RP ESTALJI, S (reprint author), UNIV DORTMUND,INST PHYS,W-4600 DORTMUND 50,GERMANY. NR 10 TC 17 Z9 17 U1 1 U2 2 PU EDITIONS PHYSIQUE PI LES ULIS CEDEX PA Z I DE COURTABOEUF AVE 7 AV DU HOGGAR, BP 112, 91944 LES ULIS CEDEX, FRANCE SN 1155-4339 J9 J PHYS IV JI J. Phys. IV PD OCT PY 1992 VL 2 IS C2 BP 159 EP 163 DI 10.1051/jp4:1992221 PG 5 WC Physics, Multidisciplinary SC Physics GA KN481 UT WOS:A1992KN48100022 ER PT J AU UHM, HS AF UHM, HS TI A THEORETICAL-MODEL OF NEUTRON THERMALIZATION IN A MEDIUM SO JOURNAL OF APPLIED PHYSICS LA English DT Article AB A simple theoretical model is developed to explain neutron thermalization properties. Assuming that a fast neutron source is located at the origin, the neutron distribution is described as a function of distance from the source. Based on the continuous slowing-down model, it is shown that the thermal neutron flux is a simple function of the diffusion constant D, the reciprocal length kappa, and the Fermi age tau of a moderator material. Several points are noteworthy from calculation of the thermal neutron flux. First, theoretical results for polyethylene moderator agree remarkably well with simulation data obtained from a Monte Carlo simulation. Second, the thermal neutron flux at the origin is proportional to the square of moderator density. Third, the volume of the large thermal neutron flux increases drastically as the Fermi age increases. Finally, we also note that theoretical results agree reasonably well with experimental data for a broad range of physical parameters. A simple analytical expression of the thermalization factor of a moderator material is derived and it is found that its theoretical values agree rather closely with measured values. RP UHM, HS (reprint author), USN,CTR SURFACE WARFARE,10901 NEW HAMPSHIRE AVE,WHITE OAK,SILVER SPRING,MD 20903, USA. NR 15 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 OCT 1 PY 1992 VL 72 IS 7 BP 2549 EP 2555 DI 10.1063/1.351553 PG 7 WC Physics, Applied SC Physics GA JT007 UT WOS:A1992JT00700002 ER PT J AU MOORE, FG KLEIN, PB DIETRICH, HB AF MOORE, FG KLEIN, PB DIETRICH, HB TI SITE TRANSFER OF SI IN GAAS AFTER HEAVY-ION MEV IMPLANTATION AND ANNEALING SO JOURNAL OF APPLIED PHYSICS LA English DT Article ID DEPENDENT ELECTRICAL ACTIVATION; DOPED GAAS; VIBRATIONAL-MODE; SILICON; DAMAGE; COMPENSATION AB The electrical and optical properties of n-type and p-type epitaxial GaAs layers have been studied after MeV implantation of heavy (Xe and Er) ions. All implanted layers were highly resistive immediately after implantation. Annealing to only moderate temperature (725-degrees-C) recovered the as-grown electrical properties of beryllium-doped p-type layers. However, after annealing silicon-doped n-type layers, we observe a dramatic change from the as-grown carrier profiles. After anneal, the silicon-doped, n-type layers became conductive but the carrier profiles were markedly different from the as-grown material. A significant thickness of the implanted portion of the epitaxial layers shows distinct p-type conductivity after annealing. We have correlated this p-type activity with a transfer of silicon from the gallium sublattice (Si(Ga)) to the arsenic sublattice (Si(As)). The site transfer is viewed to result from the altered thermodynamics governing site occupancy during annealing of Si in GaAs under the unique damage conditions produced by heavy ion MeV implantation. Additionally, the observed thermal stability of the site transfer process above 875-degrees-C may have implications for implantation isolation techniques. C1 USN,RES LAB,WASHINGTON,DC 20375. RP MOORE, FG (reprint author), WHITMAN COLL,DEPT PHYS,WALLA WALLA,WA 99362, USA. NR 26 TC 3 Z9 3 U1 0 U2 1 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0021-8979 J9 J APPL PHYS JI J. Appl. Phys. PD OCT 1 PY 1992 VL 72 IS 7 BP 2692 EP 2699 DI 10.1063/1.351518 PG 8 WC Physics, Applied SC Physics GA JT007 UT WOS:A1992JT00700020 ER PT J AU LOMAX, JF AF LOMAX, JF TI CONDUCTING MIDSHIPMEN - A CLASSROOM ACTIVITY MODELING EXTENDED BONDING IN SOLIDS SO JOURNAL OF CHEMICAL EDUCATION LA English DT Editorial Material RP LOMAX, JF (reprint author), USN ACAD,ANNAPOLIS,MD 21402, USA. NR 2 TC 1 Z9 1 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0021-9584 J9 J CHEM EDUC JI J. Chem. Educ. PD OCT PY 1992 VL 69 IS 10 BP 794 EP 795 PG 2 WC Chemistry, Multidisciplinary; Education, Scientific Disciplines SC Chemistry; Education & Educational Research GA JZ474 UT WOS:A1992JZ47400011 ER PT J AU STARK, G SMITH, PL HUBER, KP YOSHINO, K STEVENS, MH ITO, K AF STARK, G SMITH, PL HUBER, KP YOSHINO, K STEVENS, MH ITO, K TI ABSORPTION-BAND OSCILLATOR-STRENGTHS OF N2 TRANSITIONS BETWEEN 95.8 AND 99.4 NM SO JOURNAL OF CHEMICAL PHYSICS LA English DT Article ID EXTREME ULTRAVIOLET EMISSION; VUV SPECTROSCOPIC FACILITY; ELECTRON-IMPACT; MOLECULAR NITROGEN; CROSS-SECTIONS; HOMOGENEOUS PERTURBATION; B'(1)1SIGMAU(+) LEVELS; MEDIUM-RESOLUTION; UPPER-ATMOSPHERE; N-2 AB Photoabsorption cross sections for seven electric dipole-allowed N2 bands, at wavelengths between 95.8 and 99.4 nm, have been measured with an instrumental resolution of 6.2 X 10(-4) nm. Integrated cross sections and band oscillator strengths are presented for the c4' 1SIGMA(u)+(v' = 0)-X 1SIGMA(g)'(v" = 0) and c3 1PI(u)(v' = 0)-X 1SIGMA(g)+(v" = 0) transitions, as well as for five bands (v'= 0,1,2,3,4) in the b 1PI(u)(v')-X 1SIGMA(g)+(0) progression. The results are compared with earlier, lower resolution absorption measurements, electron scattering measurements, and calculations based on a deperturbation analysis of the excited states. C1 HARVARD SMITHSONIAN CTR ASTROPHYS,CAMBRIDGE,MA 02138. NATL RES COUNCIL CANADA,HERZBERG INST ASTROPHYS,OTTAWA K1A 0R6,ONTARIO,CANADA. USN,RES LAB,EO HULBURT CTR SPACE RES,WASHINGTON,DC 20375. NATL LAB HIGH ENERGY PHYS,PHOTON FACTORY,OHO,IBARAKI 305,JAPAN. RP STARK, G (reprint author), WELLESLEY COLL,DEPT PHYS,WELLESLEY,MA 02181, USA. OI Stevens, Michael/0000-0003-1082-8955 NR 38 TC 35 Z9 35 U1 0 U2 5 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0021-9606 J9 J CHEM PHYS JI J. Chem. Phys. PD OCT 1 PY 1992 VL 97 IS 7 BP 4809 EP 4814 DI 10.1063/1.463835 PG 6 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA JR338 UT WOS:A1992JR33800023 ER PT J AU OYOFO, BA THORNTON, SA BURR, DH TRUST, TJ PAVLOVSKIS, OR GUERRY, P AF OYOFO, BA THORNTON, SA BURR, DH TRUST, TJ PAVLOVSKIS, OR GUERRY, P TI SPECIFIC DETECTION OF CAMPYLOBACTER-JEJUNI AND CAMPYLOBACTER-COLI BY USING POLYMERASE CHAIN-REACTION SO JOURNAL OF CLINICAL MICROBIOLOGY LA English DT Article ID FLAGELLIN GENES; DNA AMPLIFICATION; ESCHERICHIA-COLI; COLONIZATION; EXPRESSION; SAMPLES; RABBITS; DISEASE; PROBE AB Development of a routine detection assay for Campylobacter jejuni and Campylobacter coli in clinical specimens was undertaken by using the polymerase chain reaction (PCR). An oligonucleotide primer pair from a conserved 5' region of the flaA gene of C. coli VC167 was used to amplify a 450-bp region by PCR. The primer pair specifically detected 4 strains of C. coli and 47 strains of C. jejuni; but it did not detect strains of Campylobacter fetus, Campylobacter lari, Campylobacter upsaliensis, Campylobacter cryaerophila, Campylobacter ter butzleri, Campylobacter hyointestinalis, Wolinella recta, Helicobacter pylori, Escherichia coli, Shigella spp., Salmonella spp., Vibrio cholerae, Citrobacter freundii, or Aeromonas spp. By using a nonradioactively labelled probe internal to the PCR product, the assay could detect as little as 0.0062 pg of purified C. coli DNA, or the equivalent of four bacteria. In stools seeded with C. coli cells, the probe could detect between 30 and 60 bacteria per PCR assay. The assay was also successfully used to detect C. coli in rectal swab specimens from experimentally infected rabbits and C. jejuni in human stool samples. C1 USN,MED RES INST,ENTER DIS PROGRAM,BETHESDA,MD 20889. UNIV VICTORIA,DEPT BIOCHEM & MICROBIOL,VICTORIA V8W 2Y2,BC,CANADA. NR 43 TC 107 Z9 108 U1 0 U2 3 PU AMER SOC MICROBIOLOGY PI WASHINGTON PA 1325 MASSACHUSETTS AVENUE, NW, WASHINGTON, DC 20005-4171 SN 0095-1137 J9 J CLIN MICROBIOL JI J. Clin. Microbiol. PD OCT PY 1992 VL 30 IS 10 BP 2613 EP 2619 PG 7 WC Microbiology SC Microbiology GA JP653 UT WOS:A1992JP65300016 PM 1400961 ER PT J AU WEINGER, MB SCANLON, TS MILLER, L AF WEINGER, MB SCANLON, TS MILLER, L TI A WIDELY UNAPPRECIATED CAUSE OF FAILURE OF AN AUTOMATIC NONINVASIVE BLOOD-PRESSURE MONITOR SO JOURNAL OF CLINICAL MONITORING LA English DT Article DE MONITORING, BLOOD PRESSURE; HEART, DYSRHYTHMIAS; EQUIPMENT, ALARMS AB Many anesthesiologists have come to depend on automatic noninvasive blood pressure monitoring to obtain blood pressure (BP) readings. A case is presented in which, during a critical phase of the anesthetic, an automatic noninvasive blood pressure (ANIBP) device not only failed to provide meaningful clinical data but, in fact, gave an error message that was misleading. At the time of the message, the patient was noted to be in ventricular trigeminy at a rate of 92 beats/min. It appears that the repetitive beat-to-beat fall in blood pressure due to the dysrhythmia "fooled" the automatic noninvasive blood pressure device's software algorithm into believing that there was an air leak in the system. Thus, in addition to pointing out an unappreciated and potentially troubling device-related critical event, the present case demonstrates the importance of good human factors design for medical devices used in the critical care setting. In particular, the issue is raised of how medical devices should deal with uncertain or potentially misleading data. C1 UNIV CALIF SAN DIEGO,DEPT ANESTHESIOL,SAN DIEGO,CA 92103. USN HOSP,SAN DIEGO,CA 92134. RP WEINGER, MB (reprint author), VET ADM MED CTR 125,DEPT ANESTHESIOL,3350 LA JOLLA VILLAGE DR,SAN DIEGO,CA 92160, USA. NR 5 TC 1 Z9 1 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 OCT PY 1992 VL 8 IS 4 BP 291 EP 294 DI 10.1007/BF01617911 PG 4 WC Anesthesiology SC Anesthesiology GA JT806 UT WOS:A1992JT80600005 PM 1453189 ER PT J AU BRADY, B AF BRADY, B TI BRADY,ROBERT,F. TECHNICAL EDITOR OF THE JCT, RECEIVES A WARM WELCOME FROM HUMBUG HILLMAN SO JOURNAL OF COATINGS TECHNOLOGY LA English DT Letter RP BRADY, B (reprint author), USN,RES LAB,706 HOPE LANE,GAITHERSBURG,MD 20878, USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU FEDERATION SOC COATING TECH PI BLUE BELL PA 492 NORRISTOWN ROAD, BLUE BELL, PA 19422 SN 0361-8773 J9 J COATING TECHNOL JI J. Coat. Technol. PD OCT PY 1992 VL 64 IS 813 BP 112 EP 112 PG 1 WC Chemistry, Applied; Materials Science, Coatings & Films SC Chemistry; Materials Science GA JV050 UT WOS:A1992JV05000009 ER PT J AU ROAHEN, JO LENTO, CA AF ROAHEN, JO LENTO, CA TI USING CYANOACRYLATE TO FACILITATE RUBBER DAM ISOLATION OF TEETH SO JOURNAL OF ENDODONTICS LA English DT Article AB Cyanoacrylate is an extremely strong bonding agent which has many applications in medicine. It is also effective in obtaining a leakproof seal of rubber dam around a structurally compromised tooth requiring endodontic therapy. RP ROAHEN, JO (reprint author), USN,NATL DENT CTR,DEPT ENDODONT,BETHESDA,MD 20889, USA. NR 6 TC 0 Z9 0 U1 0 U2 1 PU WILLIAMS & WILKINS PI BALTIMORE PA 351 WEST CAMDEN ST, BALTIMORE, MD 21201-2436 SN 0099-2399 J9 J ENDODONT JI J. Endod. PD OCT PY 1992 VL 18 IS 10 BP 517 EP 519 DI 10.1016/S0099-2399(06)81356-7 PG 3 WC Dentistry, Oral Surgery & Medicine SC Dentistry, Oral Surgery & Medicine GA KC863 UT WOS:A1992KC86300012 PM 1289480 ER PT J AU SKIRA, CA AGNELLO, M AF SKIRA, CA AGNELLO, M TI CONTROL-SYSTEMS FOR THE NEXT CENTURY FIGHTER ENGINES SO JOURNAL OF ENGINEERING FOR GAS TURBINES AND POWER-TRANSACTIONS OF THE ASME LA English DT Article AB The paper describes a conceptual control system design based on advanced technologies currently in the exploratory development phase, and, in some cases, emerging into the advanced development phase. It explores future propulsion control systems that focus on improvements in three areas: (1) significantly reducing control system weight; (2) enhancing engine performance (thrust, sfc, etc.); and (3) improving control system reliability and tolerance to high-threat environments (temperature, vibration, EMI, EMP, etc.). The factors that will influence the design and hardware configuration of future propulsion control systems are described. Design goals for future systems, based on the DOD/NASA IHPTET Initiative, and projections of emerging technology capability (and availability) form the basis for future propulsion control system design requirements and for estimating future hardware configurations. C1 USN,NAVAL AIR PROP CTR,TRENTON,NJ 08628. RP SKIRA, CA (reprint author), USAF,AERO PROP & POWER LAB,WRIGHT PATTERSON AFB,OH 45433, USA. NR 11 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 0742-4795 J9 J ENG GAS TURB POWER JI J. Eng. Gas. Turbines Power-Trans. ASME PD OCT PY 1992 VL 114 IS 4 BP 749 EP 754 DI 10.1115/1.2906652 PG 6 WC Engineering, Mechanical SC Engineering GA JV890 UT WOS:A1992JV89000020 ER PT J AU WATTS, JW DWAN, TE BROCKUS, CG AF WATTS, JW DWAN, TE BROCKUS, CG TI OPTIMAL STATE-SPACE CONTROL OF A GAS-TURBINE ENGINE SO JOURNAL OF ENGINEERING FOR GAS TURBINES AND POWER-TRANSACTIONS OF THE ASME LA English DT Article AB An analog fuel control for a gas turbine engine was compared with several state-space derived fuel controls. A single-spool, simple cycle gas turbine engine was modeled using ACSL (high level simulation language based on FORTRAN). The model included an analog fuel control representative of existing commercial fuel controls. The ACSL model was stripped of nonessential states to produce an eight-state linear state-space model of the engine. The A, B, and C matrices, derived from rated operating conditions, were used to obtain feedback control gains by the following methods: (1) state feedback; (2) LQR theory; (3) Bellman method; and (4) polygonal search. An off-load transient followed by an on-load transient was run for each of these fuel controls. The transient curves obtained were used to compare the state-space fuel controls with the analog fuel control. The state-space fuel controls did better than the analog control. RP WATTS, JW (reprint author), USN ACAD,DEPT WEAPONS & SYST ENGN,ANNAPOLIS,MD 21402, USA. NR 8 TC 8 Z9 8 U1 0 U2 0 PU ASME-AMER SOC MECHANICAL ENG PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 SN 0742-4795 J9 J ENG GAS TURB POWER JI J. Eng. Gas. Turbines Power-Trans. ASME PD OCT PY 1992 VL 114 IS 4 BP 763 EP 767 DI 10.1115/1.2906654 PG 5 WC Engineering, Mechanical SC Engineering GA JV890 UT WOS:A1992JV89000022 ER PT J AU DONAHUE, RE KESSLER, SW BODINE, D MCDONAGH, K DUNBAR, C GOODMAN, S AGRICOLA, B BYRNE, E RAFFELD, M MOEN, R BACHER, J ZSEBO, KM NIENHUIS, AW AF DONAHUE, RE KESSLER, SW BODINE, D MCDONAGH, K DUNBAR, C GOODMAN, S AGRICOLA, B BYRNE, E RAFFELD, M MOEN, R BACHER, J ZSEBO, KM NIENHUIS, AW TI HELPER VIRUS-INDUCED T-CELL LYMPHOMA IN NONHUMAN-PRIMATES AFTER RETROVIRAL MEDIATED GENE-TRANSFER SO JOURNAL OF EXPERIMENTAL MEDICINE LA English DT Article ID COLONY-STIMULATING FACTOR; HEMATOPOIETIC STEM-CELLS; MURINE LEUKEMIA VIRUSES; EXPRESSION; LINE; SAFE; CONSTRUCTION; GENERATION; THERAPY; RAT AB Moloney Murine Leukemia Virus (MoMuLV) causes T cell neoplasms in rodents but is not known to be a pathogen in primates. The core protein and enzyme genes of the MoMuLV genome together with an amphotropic envelope gene are utilized to engineer the cell lines that generate retroviral vectors for use in current human gene therapy applications. We developed a producer clone that generates a very high concentration of retroviral vector particles to optimize conditions for gene insertion into pluripotent hematopoietic stem cells. This producer cell line also generates a much lower concentration of replication-competent virus that arose through recombination. Stem cells from rhesus monkeys were purified by immunoselection with an anti-CD34 antibody, incubated in vitro for 80-86 h in the presence of retroviral vector particles with accompanying replication-competent virus and used to reconstitute recipients whose bone marrow had been ablated by total body irradiation. The retroviral vector genome was detected in circulating cells of five of eight transplant recipients of CD34+ cells and in the circulating cells of two recipients of infected, unfractionated bone marrow mononuclear cells. Three recipients of CD34+ cells had a productive infection with replication-competent virus. Six or seven mo after transplantation, each of these animals developed a rapidly progressive T cell neoplasm involving the thymus, lymph nodes, liver, spleen, and bone marrow. Lymphoma cells contained 10-50 copies of the replication-competent virus, but lacked the retroviral vector genome. We conclude that replication-competent viruses arising from producer cells making retroviral vectors can be pathogenic in primates, which underscores the importance of carefully screening retroviral producer clones used in human trials to exclude contamination with replication-competent virus. C1 NHLBI, CLIN HEMATOL BRANCH, BLDG 10, ROOM 7C-103, BETHESDA, MD 20892 USA. GENET THERAPY INC, GAITHERSBURG, MD 20878 USA. AMGEN INC, THOUSAND OAKS, CA 91320 USA. NIH, NATL CTR RES SERV, VET RESOURCES PROGRAM, BETHESDA, MD 20892 USA. USN, MED RES INST, IMMUNE CELL BIOL PROGRAM, BETHESDA, MD 20814 USA. NCI, PATHOL LAB, BETHESDA, MD 20892 USA. NR 43 TC 443 Z9 454 U1 1 U2 7 PU ROCKEFELLER UNIV PRESS PI NEW YORK PA 950 THIRD AVE, 2ND FLR, NEW YORK, NY 10022 USA SN 0022-1007 EI 1540-9538 J9 J EXP MED JI J. Exp. Med. PD OCT 1 PY 1992 VL 176 IS 4 BP 1125 EP 1135 DI 10.1084/jem.176.4.1125 PG 11 WC Immunology; Medicine, Research & Experimental SC Immunology; Research & Experimental Medicine GA JP862 UT WOS:A1992JP86200022 PM 1383375 ER PT J AU MERA, AE GRIFFITH, JR AF MERA, AE GRIFFITH, JR TI POLYMERIZATION OF REACTIVE FLUOROALIPHATIC DIAMINES WITH SEBACOYL CHLORIDE TO GIVE FLUORINATED ALIPHATIC POLYAMIDES (NYLONS) SO JOURNAL OF FLUORINE CHEMISTRY LA English DT Article ID AROMATIC POLYAMIDES AB Both aminoacylated fluoroaliphatic diamines ('reactive' diamines) [H2N(CH2)3-C(=O)NHCH2CH2(CF2)nCH2CH2NHC(=O)(CH2)3NH2; n=4,81 and their tetrahydrobromide salts have been polymerized interfacially with sebacoyl chloride to give fluoroaliphatic polyamides. The polymers have been characterized by solution viscometry, DSC, TGA, water contact angle measurements, equilibrium water absorption and solubility, and compared to Nylon 6,10. The effects of using free diamine versus diamine salt as the monomer and of amount of fluorine in the monomer on polymer molecular weight are discussed. Also, the synthesis of the tetrahydrobromide salts is included since previous preliminary reports had identified the products as dihydrobromide salts. RP MERA, AE (reprint author), USN,RES LAB,CODE 6120,WASHINGTON,DC 20375, USA. NR 17 TC 1 Z9 1 U1 1 U2 6 PU ELSEVIER SCIENCE SA LAUSANNE PI LAUSANNE 1 PA PO BOX 564, 1001 LAUSANNE 1, SWITZERLAND SN 0022-1139 J9 J FLUORINE CHEM JI J. Fluor. Chem. PD OCT PY 1992 VL 59 IS 1 BP 81 EP 89 DI 10.1016/S0022-1139(00)80205-5 PG 9 WC Chemistry, Inorganic & Nuclear; Chemistry, Organic SC Chemistry GA JW938 UT WOS:A1992JW93800009 ER PT J AU CHEN, J AF CHEN, J TI NONLINEAR DYNAMICS OF CHARGED-PARTICLES IN THE MAGNETOTAIL SO JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS LA English DT Review ID PLASMA SHEET BOUNDARY; MAXWELLIAN NEUTRAL-SHEET; TAIL CURRENT SHEET; COLLISIONLESS TEARING INSTABILITY; IONOSPHERE CURRENT SYSTEMS; PITCH-ANGLE SCATTERING; KINETIC ALFVEN WAVES; MAGNETIC-FIELD MODEL; ION-BEAM GENERATION; GEOMAGNETIC TAIL AB An important region of the Earth's magnetosphere is the nightside magnetotail, which is believed to play a significant role in energy storage and release associated with substorms. The magnetotail contains a current sheet which separates regions of oppositely directed magnetic field. Particle motion in the collisionless magnetotail has been a long-standing problem. Recent research from the dynamical point of view has yielded considerable new insights into the fundamental properties of orbits and of particle distribution functions. A new framework of understanding magnetospheric plasma properties is emerging. Some novel predictions based directly on nonlinear dynamics have proved to be robust and in apparent good agreement with observation. The Earth's magnetotail may serve as a paradigm, one accessible by in situ observation, of a broad class of boundary regions with embedded current sheets. This article reviews the nonlinear dynamics of charged particles in the magnetotail configuration. The emphasis is on the relationships between the dynamics and physical observables. At the end of the introduction, sections containing basic material are indicated. RP USN, RES LAB, DIV PLASMA PHYS, BEAM PHYS BRANCH, WASHINGTON, DC 20375 USA. NR 168 TC 153 Z9 154 U1 0 U2 6 PU AMER GEOPHYSICAL UNION PI WASHINGTON PA 2000 FLORIDA AVE NW, WASHINGTON, DC 20009 USA SN 2169-9380 EI 2169-9402 J9 J GEOPHYS RES-SPACE JI J. Geophys. Res-Space Phys. PD OCT 1 PY 1992 VL 97 IS A10 BP 15011 EP 15050 DI 10.1029/92JA00955 PG 40 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA JR009 UT WOS:A1992JR00900021 ER PT J AU WESTERINK, JJ LUETTICH, RA BAPTISTA, AM SCHEFFNER, NW FARRAR, P AF WESTERINK, JJ LUETTICH, RA BAPTISTA, AM SCHEFFNER, NW FARRAR, P TI TIDE AND STORM-SURGE PREDICTIONS USING FINITE-ELEMENT MODEL SO JOURNAL OF HYDRAULIC ENGINEERING-ASCE LA English DT Article ID SHALLOW-WATER EQUATIONS; ENGLISH-CHANNEL; NORTH-SEA; COMPUTATIONS; BIGHT AB A finite element (FE) model is used to study tides and hurricane storm surge in the Gulf of Mexico in the region ranging from the Mississippi Sound to the northwest coast of Florida. Issues that arc emphasized include the use of large domains, the importance ot a high degree of grid resolution in coastal regions of interest, the use of meshes with highly varying nodal densities to minimize the size of the discrete problem, and the use of the generalized wave-continuity equation (GWCE) for FE-based solutions to the shallow-water equations. The computations presented are unprecedented in their scope, level of localized detail, and degree of grid-size variability. The GWCE-based FE model leads to very accurate and efficient flow solutions. C1 UNIV N CAROLINA,INST MARINE SCI,MOREHEAD CITY,NC 28557. OREGON GRAD INST,DEPT ENVIRONM SCI,BEAVERTON,OR 97006. USA,ENGRS WTRWAYS EXPTL STN,VICKSBURG,MS 39180. USN,OFF OCEANG,DEPT OCEANG,BAY ST LOUIS,MS 39522. RP WESTERINK, JJ (reprint author), UNIV NOTRE DAME,DEPT CIVIL ENGN & GEOL SCI,NOTRE DAME,IN 46556, USA. NR 29 TC 74 Z9 75 U1 3 U2 10 PU ASCE-AMER SOC CIVIL ENGINEERS PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2398 SN 0733-9429 J9 J HYDRAUL ENG-ASCE JI J. Hydraul. Eng.-ASCE PD OCT PY 1992 VL 118 IS 10 BP 1373 EP 1390 DI 10.1061/(ASCE)0733-9429(1992)118:10(1373) PG 18 WC Engineering, Civil; Engineering, Mechanical; Water Resources SC Engineering; Water Resources GA JP190 UT WOS:A1992JP19000003 ER PT J AU SAWYER, MH WU, YN CHAMBERLIN, CJ BURGOS, C BRODINE, SK BOWLER, WA LAROCCO, A OLDFIELD, EC WALLACE, MR AF SAWYER, MH WU, YN CHAMBERLIN, CJ BURGOS, C BRODINE, SK BOWLER, WA LAROCCO, A OLDFIELD, EC WALLACE, MR TI DETECTION OF VARICELLA-ZOSTER VIRUS-DNA IN THE OROPHARYNX AND BLOOD OF PATIENTS WITH VARICELLA SO JOURNAL OF INFECTIOUS DISEASES LA English DT Note ID POLYMERASE CHAIN-REACTION; NONIMMUNOCOMPROMISED CHILDREN; VIREMIA; HYBRIDIZATION; INCUBATION AB The polymerase chain reaction (PCR) was used to detect varicella-zoster virus (VZV) DNA in respiratory epithelial cells and in peripheral blood leukocytes from adults with varicella. VZV DNA was detected in oropharyngeal epithelium in 62% of patients early in the course of varicella; the amount of VZV DNA declined with time and was detectable in only 22% of patients for >6 days. VZV DNA was also detected in peripheral blood leukocytes in 74% of patients early in disease and was detected in both polymorphonuclear and mononuclear leukocytes. PCR demonstrated the presence of VZV DNA in the oropharynx and blood of most patients during varicella, in contrast to the ability to detect VZV in these tissues by viral culture. C1 USN HOSP,SAN DIEGO,CA 92134. RP SAWYER, MH (reprint author), UNIV CALIF SAN DIEGO,9500 GILMAN DR,LA JOLLA,CA 92093, USA. NR 15 TC 42 Z9 43 U1 0 U2 0 PU UNIV CHICAGO PRESS PI CHICAGO PA 5720 S WOODLAWN AVE, CHICAGO, IL 60637 SN 0022-1899 J9 J INFECT DIS JI J. Infect. Dis. PD OCT PY 1992 VL 166 IS 4 BP 885 EP 888 PG 4 WC Immunology; Infectious Diseases; Microbiology SC Immunology; Infectious Diseases; Microbiology GA JP645 UT WOS:A1992JP64500028 PM 1326584 ER PT J AU BURNS, WK HOWERTON, MM MOELLER, RP AF BURNS, WK HOWERTON, MM MOELLER, RP TI PERFORMANCE AND MODELING OF PROTON EXCHANGED LITAO3 BRANCHING MODULATORS SO JOURNAL OF LIGHTWAVE TECHNOLOGY LA English DT Article ID DIGITAL OPTICAL SWITCH; WAVE-GUIDES; DEVICES AB Proton exchanged LiTaO3 branching modulators are demonstrated experimentally and modeled using a normal mode coupled mode theory. The normal modes are approximated by ordinary coupled-mode theory parameters which are experimentally obtained. Agreement between the model and the experimental results is demonstrated. Crosstalk in these linear branch devices is found to be linearly proportional to the voltage-length product, a result which leads to an analytic expression for the output power. C1 SFA INC,LANDOVER,MD 20785. RP BURNS, WK (reprint author), USN,RES LAB,OPT WAVEGUIDE SECT,WASHINGTON,DC 20375, USA. NR 24 TC 14 Z9 14 U1 0 U2 1 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0733-8724 J9 J LIGHTWAVE TECHNOL JI J. Lightwave Technol. PD OCT PY 1992 VL 10 IS 10 BP 1403 EP 1408 DI 10.1109/50.166783 PG 6 WC Engineering, Electrical & Electronic; Optics; Telecommunications SC Engineering; Optics; Telecommunications GA JX145 UT WOS:A1992JX14500013 ER PT J AU GUTIERREZ, CJ KREBS, JJ FILIPKOWSKI, ME PRINZ, GA AF GUTIERREZ, CJ KREBS, JJ FILIPKOWSKI, ME PRINZ, GA TI STRONG TEMPERATURE-DEPENDENCE OF THE 90-DEGREES COUPLING IN FE/AL/FE(001) MAGNETIC TRILAYERS SO JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS LA English DT Letter ID MOLECULAR-BEAM EPITAXY; LAYERED STRUCTURES; EXCHANGE; FE; MAGNETORESISTANCE; SUPERLATTICES; ZNSE AB The temperature dependence of the unusual magnetic 90-degrees coupling in epitaxial Fe/Al/Fe(001) trilayers has been determined. Trilayers with Al thickness near 15 angstrom exhibit a rapid decrease of coupling strength (B-12) with increasing temperature. This temperature dependence is well described by the relations B-12 = B-12(0)(1 - T/T0)2 or B-12 = B-12(0) exp(-T/T0) which contrast with the approximately linear temperature dependence previously reported for 180-degrees coupled systems. RP GUTIERREZ, CJ (reprint author), USN,RES LAB,CODE 63401,WASHINGTON,DC 20375, USA. NR 20 TC 50 Z9 50 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0304-8853 J9 J MAGN MAGN MATER JI J. Magn. Magn. Mater. PD OCT PY 1992 VL 116 IS 3 BP L305 EP L310 DI 10.1016/0304-8853(92)90106-X PG 6 WC Materials Science, Multidisciplinary; Physics, Condensed Matter SC Materials Science; Physics GA JZ592 UT WOS:A1992JZ59200002 ER PT J AU LOCK, H MACIEL, GE JOHNSON, CE AF LOCK, H MACIEL, GE JOHNSON, CE TI NATURAL-ABUNDANCE C-13 DYNAMIC NUCLEAR-POLARIZATION EXPERIMENTS ON CHEMICAL VAPOR-DEPOSITED DIAMOND FILM SO JOURNAL OF MATERIALS RESEARCH LA English DT Article ID NMR-SPECTROSCOPY; SOLIDS; RESONANCE; GROWTH AB C-13 cross-polarization (CP) and direct-polarization (DP) spectra of an 83 mg sample of a chemical vapor deposited (CVD) diamond film (combined from 12 separate depositions) have been obtained via dynamic nuclear polarization (DNP) combined with magic-angle spinning (MAS). With DNP, the presence of unpaired electron spins in the sample, measured to be 2 X 10(18) spins/g, provides a way to enhance the C-13 or the "residual" H-1 signal by irradiating the sample with microwaves at or near the electron spin resonance (ESR) Larmor frequency; the interactions between the unpaired electrons and protons or C-13 spins lead to a transfer of polarization from the electron spin system to the H-1 and/or C-13 spin systems. No signal for sp2 hybridized carbons could be observed. The DNP-CP-MAS spectrum, obtained in an experiment in which the DNP-enhanced proton polarization is in tum transferred via CP to the C-13 spin system, differs significantly from the DNP-DP-MAS spectrum, in which the C-13 spins are directly enhanced. C1 COLORADO STATE UNIV,DEPT CHEM,FT COLLINS,CO 80523. USN,CTR WARFARE,DIV WEAP,RES DEPT,DIV CHEM,CHINA LAKE,CA 93555. NR 25 TC 13 Z9 13 U1 0 U2 4 PU MATERIALS RESEARCH SOCIETY PI PITTSBURGH PA 9800 MC KNIGHT ROAD SUITE 327, PITTSBURGH, PA 15237 SN 0884-2914 J9 J MATER RES JI J. Mater. Res. PD OCT PY 1992 VL 7 IS 10 BP 2791 EP 2797 DI 10.1557/JMR.1992.2791 PG 7 WC Materials Science, Multidisciplinary SC Materials Science GA JR170 UT WOS:A1992JR17000019 ER PT J AU GRISCOM, DL AF GRISCOM, DL TI ELECTRON-SPIN-RESONANCE CHARACTERIZATION OF SELF-TRAPPED HOLES IN AMORPHOUS-SILICON DIOXIDE SO JOURNAL OF NON-CRYSTALLINE SOLIDS LA English DT Article; Proceedings Paper CT CONF ON POINT DEFECTS IN GLASSES CY AUG 28-SEP 03, 1991 CL RIGA, LATVIA ID SI-29 HYPERFINE-STRUCTURE; POLARON OPTICAL-ABSORPTION; FUNDAMENTAL DEFECT CENTERS; PURITY FUSED SILICAS; E' CENTER; GLASS; CRYSTALLINE; GERMANIUM; SPECTRA; QUARTZ AB The electron spin resonance spectra of radiation-induced self-trapped holes (STHs) in amorphous silicon dioxide are isolated by isochronal annealing experiments and computer simulation analyses. Two distinct components, denoted STH1 and STH2 (plus a third component intermediate between the two), have been identified. The g matrices and Si-29 and O-17 hyperfine matrices of STH1 and STH2 are determined and form the bases for proposing the following models for these defects: STH1 comprises a hole trapped in the 2p orbital of a normal bridging oxygen in the glass network; it is a small polaron. STH2 probably consists of a hole rapidly tunneling between degenerate valence-band-edge states on a pair of adjacent oxygens; it is argued to be a peculiar type of Anderson localized state. Among the various radiation-induced paramagnetic centers in silica, the STHs exhibit unique isochronal anneal characteristics; these characteristics closely mimic the corresponding behavior of a component of trapped positive charge in thermally grown SiO2 films. RP GRISCOM, DL (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 49 TC 89 Z9 89 U1 0 U2 11 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 OCT PY 1992 VL 149 IS 1-2 BP 137 EP 160 DI 10.1016/0022-3093(92)90062-O PG 24 WC Materials Science, Ceramics; Materials Science, Multidisciplinary SC Materials Science GA JX213 UT WOS:A1992JX21300016 ER PT J AU BEREND, D OSGOOD, CF AF BEREND, D OSGOOD, CF TI ON THE EQUATION P(X) = N - AND A QUESTION OF ERDOS SO JOURNAL OF NUMBER THEORY LA English DT Article ID VALUES C1 BEN GURION UNIV NEGEV,DEPT MATH & COMP SCI,IL-84105 BEER SHEVA,ISRAEL. USN,RES LAB,WASHINGTON,DC 20375. NR 5 TC 7 Z9 7 U1 0 U2 0 PU ACADEMIC PRESS INC JNL-COMP SUBSCRIPTIONS PI SAN DIEGO PA 525 B ST, STE 1900, SAN DIEGO, CA 92101-4495 SN 0022-314X J9 J NUMBER THEORY JI J. Number Theory PD OCT PY 1992 VL 42 IS 2 BP 189 EP 193 DI 10.1016/0022-314X(92)90020-P PG 5 WC Mathematics SC Mathematics GA JR987 UT WOS:A1992JR98700005 ER PT J AU DRISCOLL, CF HUGHES, B OSTROWSKI, JS AF DRISCOLL, CF HUGHES, B OSTROWSKI, JS TI NATURALLY-OCCURRING UNDERCUTS IN THE RETENTION OF AN INTERIM OCULOFACIAL PROSTHESIS SO JOURNAL OF PROSTHETIC DENTISTRY LA English DT Article AB The use of adhesives in retaining maxillofacial prostheses bas been advocated and, applied for many years. Implant placement has reduced the need for adhesives in some patients but is impractical when ablative surgery is followed by radiation treatment. A technique is described that permits the rapid fabrication of an oculofacial prosthesis that uses naturally occurring orbital undercuts for retention, rather than adhesives that may further irritate radiated tissues. C1 USN,SCH DENT,BETHESDA,MD 20814. RP DRISCOLL, CF (reprint author), US DENTAC,TRIPLER ARMY MED CTR,HONOLULU,HI 96859, USA. NR 7 TC 1 Z9 1 U1 0 U2 2 PU MOSBY-YEAR BOOK INC PI ST LOUIS PA 11830 WESTLINE INDUSTRIAL DR, ST LOUIS, MO 63146-3318 SN 0022-3913 J9 J PROSTHET DENT JI J. Prosthet. Dent. PD OCT PY 1992 VL 68 IS 4 BP 652 EP 654 DI 10.1016/0022-3913(92)90382-K PG 3 WC Dentistry, Oral Surgery & Medicine SC Dentistry, Oral Surgery & Medicine GA JP877 UT WOS:A1992JP87700017 PM 1403945 ER PT J AU CHAUHAN, SP RUTHERFORD, SE SHARP, TW CARNEVALE, TA RUNZEL, AR AF CHAUHAN, SP RUTHERFORD, SE SHARP, TW CARNEVALE, TA RUNZEL, AR TI INTRAPARTUM AMNIOTIC-FLUID INDEX AND NEONATAL ACIDOSIS - A PILOT-STUDY TO DETERMINE THE CORRELATION SO JOURNAL OF REPRODUCTIVE MEDICINE LA English DT Article ID FETAL HEART-RATE; VOLUME AB The purpose of a prospective study was to determine if there was a significant association between an intrapartum amniotic fluid index (AFI) less-than-or-equal-to 5.0 cm and neonatal acidosis (umbilical arterial pH < 7.20 or metabolic acidosis [umbilical arterial pH < 7.20 and base deficit > 10 mEq/L]). In early labor 101 gravidas at greater-than-or-equal-to 37 gestational weeks underwent a four-quadrant amniotic fluid assessment; at delivery, umbilical arterial acid-base levels were determined. Among women with AFI less-than-or-equal-to 5.0 cm as compared to those with AFI > 5.0 cm, the fetuses were more likely to have neonatal acidosis (31.2% versus 17.6%, respectively) and metabolic acidosis (25.0% versus 10.5%, respectively), although the differences were not statistically significant. C1 USN HOSP,DEPT OBSTET & GYNECOL,NAPLES,ITALY. EVERGREEN HOSP,MED CTR,KIRKLAND,WA. USN,ENVIRONM PREVENT MED UNIT 7,NEW YORK,NY. NR 4 TC 10 Z9 10 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 OCT PY 1992 VL 37 IS 10 BP 868 EP 870 PG 3 WC Obstetrics & Gynecology SC Obstetrics & Gynecology GA JV458 UT WOS:A1992JV45800010 PM 1479571 ER PT J AU HABIB, MK WEGMAN, EJ DAVIS, JL AF HABIB, MK WEGMAN, EJ DAVIS, JL TI SPECIAL ISSUE ON STOCHASTIC-MODELS OF BIOLOGICAL INTELLIGENCE - PREFACE SO JOURNAL OF STATISTICAL PLANNING AND INFERENCE LA English DT Editorial Material C1 GEORGE MASON UNIV,CTR COMPUTAT STAT,FAIRFAX,VA 22030. OFF NAVAL RES,ARLINGTON,VA 22217. NR 2 TC 0 Z9 0 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0378-3758 J9 J STAT PLAN INFER JI J. Stat. Plan. Infer. PD OCT PY 1992 VL 33 IS 1 BP 3 EP 4 DI 10.1016/0378-3758(92)90091-6 PG 2 WC Statistics & Probability SC Mathematics GA JV910 UT WOS:A1992JV91000002 ER PT J AU MCKENNA, TM AF MCKENNA, TM TI PHYSIOLOGICAL CONSTRAINTS ON THE FORMAL REPRESENTATION OF NEURONS SO JOURNAL OF STATISTICAL PLANNING AND INFERENCE LA English DT Article DE NEURAL MODELS; STOCHASTIC MODELS; NEURAL COMPUTATION ID FREQUENCY RECEPTIVE-FIELDS; WHITE NOISE CURRENT; AUDITORY-CORTEX; DENDRITIC SPINES; SINGLE NEURONS; VISUAL-CORTEX; NEURAL NETWORKS; DIFFUSION-APPROXIMATION; MUSCARINIC AGONISTS; HIPPOCAMPAL-NEURONS AB In this paper we examine models of neural coding in the central nervous system at both the cellular and multi-cellular level. The proliferation of neural network models proposed for modeling cognitive and mnemonic capabilities of brains or brain regions suggests the need for neurobiologists to directly test these models. In this paper, we examine assumptions in light of physiological and anatomical constraints of real neurons. We advocate the interaction of neurobiology and modeling efforts to cause these models to evolve. C1 OFF NAVAL RES,ARLINGTON,VA 22217. NR 144 TC 0 Z9 0 U1 1 U2 3 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0378-3758 J9 J STAT PLAN INFER JI J. Stat. Plan. Infer. PD OCT PY 1992 VL 33 IS 1 BP 67 EP 98 DI 10.1016/0378-3758(92)90094-9 PG 32 WC Statistics & Probability SC Mathematics GA JV910 UT WOS:A1992JV91000005 ER PT J AU AU, WWL AF AU, WWL TI APPLICATION OF THE REVERBERATION-LIMITED FORM OF THE SONAR EQUATION TO DOLPHIN ECHOLOCATION SO JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA LA English DT Article ID ATLANTIC BOTTLENOSE DOLPHIN; TURSIOPS-TRUNCATUS; TARGET DETECTION; BEAM AB The target detection range of two echolocating Atlantic Bottlenose dolphins as a function of target depth in Kaneohe Bay, Hawaii, was determined by Murchison [A. E. Murchison, Ph.D. dissertation, Univ. of Calif., Santa Cruz (1980)]. The threshold range decreased monotonically as the depth of the 6.35-cm-diam solid-steel sphere increased and approached the bottom. For the target lying on the bottom, the 50% correct detection threshold detection range was approximately 70 m. The scattering strength of the bottom in Kaneohe Bay at approximately the same location of the Murchison's experiment was recently measured using a simulated dolphin echolocation signal and a transducer tilted at the appropriate grazing angle. The bottom scattering strength along with the target strength of the 6.35-cm sphere and the dolphin threshold range were incorporated into the generalized form of the sonar equation for a reverberation-limited situation and a detection threshold of 4.0 dB was calculated. This detection threshold compared well with the 2.3 dB obtained in an experiment in which the dolphin was required to detect a target in the presence of a clutter screen. RP AU, WWL (reprint author), USN COMMAND,CTR CONTROL & SURVEILLANCE,DIV NRAD,POB 997,KAILUA,HI 96734, USA. NR 17 TC 9 Z9 10 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 OCT PY 1992 VL 92 IS 4 BP 1822 EP 1826 DI 10.1121/1.403838 PN 1 PG 5 WC Acoustics; Audiology & Speech-Language Pathology SC Acoustics; Audiology & Speech-Language Pathology GA JT538 UT WOS:A1992JT53800002 PM 1401527 ER PT J AU GAUNAURD, GC AF GAUNAURD, GC TI HYBRID BACKGROUND COEFFICIENTS TO ISOLATE THE RESONANCE SPECTROGRAMS OF SUBMERGED SHELLS SO JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA LA English DT Article ID SCATTERING; SOUND AB The scattering of sound waves by elastic shells in fluids is considered in the mid-frequency or resonance regime. Background coefficients used in the past for the purpose of extracting resonance features in the backscattering cross sections of solid bodies are known to yield inaccurate results in the case of thin shells. These coefficients are modified here. The new hybrid-type backgrounds resemble those found by the application of an impedance type of boundary condition on the shell's outer surface. The modal surface admittances (in the coefficients) are proportional to the radiation damping factor (or loss factor) at resonance of the shell's most efficiently radiating (i.e., monopole or breathing) mode. When these (frequency-dependent) hybrid backgrounds are used in the calculations, the target resonances that are thus isolated, seem quite accurate, look less distorted, and the "spectrograms" that result are optimized. This clearly increases the sensor's target-identification capabilities. As the damping losses decrease, or as the shell thickness increases, the earlier "rigid" backgrounds are recovered. RP GAUNAURD, GC (reprint author), USN,CTR SURFACE WARFARE,DAHLGREN DIV,RES DEPT R42,WHITE OAK LAB,SILVER SPRING,MD 20903, USA. NR 18 TC 17 Z9 17 U1 0 U2 1 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0001-4966 J9 J ACOUST SOC AM JI J. Acoust. Soc. Am. PD OCT PY 1992 VL 92 IS 4 BP 1981 EP 1984 DI 10.1121/1.405247 PN 1 PG 4 WC Acoustics; Audiology & Speech-Language Pathology SC Acoustics; Audiology & Speech-Language Pathology GA JT538 UT WOS:A1992JT53800020 ER PT J AU BOGART, CW YANG, TC AF BOGART, CW YANG, TC TI COMPARATIVE PERFORMANCE OF MATCHED-MODE AND MATCHED-FIELD LOCALIZATION IN A RANGE-DEPENDENT ENVIRONMENT SO JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA LA English DT Article AB Matched-mode localization has been proposed recently as an alternative to matched-field processing for underwater source localization. It involves processing in mode space rather than phone space, and requires much less processing time compared to match-field processing. To date, studies of matched-mode processing have concentrated on single vertical arrays in range-independent environments. In this paper, matched-mode localization of a source in range, depth, and bearing using twin vertical arrays is demonstrated using simulated acoustic data. The environment considered consists of sloping bottoms with a sound speed increasing with depth. Acoustic modeling assumes adiabatic normal modes, neglecting horizontal refraction. Results of source localization are compared for both a range-independent environment and for matched-mode processing versus matched-field processing. It is found that for the cases studied the matched-mode processing is an order of magnitude faster than the matched-field processing for range-depth searches, and the time difference is greater for range-bearing searches. The matched-mode ambiguity surface shows equal or slightly improved (lower) sidelobe levels compared with that of matched-field processing. Results of source localization are compared for arrays of different number of phones, different vertical spacings, and different locations. The arrays that resolve more modes generally have better performance. RP BOGART, CW (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 12 TC 21 Z9 21 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 OCT PY 1992 VL 92 IS 4 BP 2051 EP 2068 DI 10.1121/1.405257 PN 1 PG 18 WC Acoustics; Audiology & Speech-Language Pathology SC Acoustics; Audiology & Speech-Language Pathology GA JT538 UT WOS:A1992JT53800029 ER PT J AU COLLINS, MD AF COLLINS, MD TI A SELF-STARTER FOR THE PARABOLIC EQUATION METHOD SO JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA LA English DT Article ID ABSORBING BOUNDARY-CONDITIONS; FINITE-DIFFERENCE TREATMENT; ACOUSTIC NORMAL-MODES; WAVE-EQUATION; UNDERWATER ACOUSTICS; INTERFACE CONDITIONS; IRREGULAR INTERFACE; RANGE REFRACTION; NUMERICAL-METHOD; PROPAGATION AB An efficient method is developed for generating accurate starting fields for the parabolic equation (PE) method for both fluid and solid media. The self-starter, which is constructed by solving a one-dimensional boundary-value problem (BVP) involving the PE operator, is more efficient than the normal-mode starter, which requires the solution of a large number of similar BVPs. The self-starter depends on the depth-dependent properties of the medium and satisfies all interface and boundary conditions. Since the self-starter is based on higher-order parabolic approximations, it is accurate for problems involving wide propagation angles, large depth variations in the properties of the medium, low frequencies, interface waves, and the continuous spectrum. RP COLLINS, MD (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 44 TC 47 Z9 52 U1 2 U2 7 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0001-4966 J9 J ACOUST SOC AM JI J. Acoust. Soc. Am. PD OCT PY 1992 VL 92 IS 4 BP 2069 EP 2074 DI 10.1121/1.405258 PN 1 PG 6 WC Acoustics; Audiology & Speech-Language Pathology SC Acoustics; Audiology & Speech-Language Pathology GA JT538 UT WOS:A1992JT53800030 ER PT J AU NOVARINI, JC KEIFFER, RS CARUTHERS, JW AF NOVARINI, JC KEIFFER, RS CARUTHERS, JW TI FORWARD SCATTERING FROM FETCH-LIMITED AND SWELL-CONTAMINATED SEA SURFACES SO JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA LA English DT Article ID ACOUSTIC SCATTERING; MOSKOWITZ AB By using a Helmholtz-Kirchhoff (HK) approach described in a previous paper [J. Acoust. Soc. Am. 91, 831-822 (1992)], the forward scattering from nonfully developed sea surfaces is examined and the full three-dimensional scattering problem is addressed. Two types of departures from the limiting case of the fully developed sea are considered: fetch-limited seas and the more general case of seas that are time-evolving and swell-contaminated. Estimates of several statistical parameters of the forward scattered field are calculated for these surfaces as ensemble averages and are compared to those obtained for fully developed seas due to the same wind speed. Results are obtained for frequencies from 0.2 to 2 kHz, for moderate angles of incidence and moderate wind speeds. It is found that the fetch strongly affects the coherence and strength of the forward scattered field at and near the specular direction. In this frequency range, discrepancies in excess of 11 dB with respect to the fully developed case are predicted. For swell-contaminated surfaces, the scattering coefficient and the coherence are strongly influenced by the relative contributions of sea and swell to the total roughness and directional characteristics of the surface. Swell-contaminated sea surfaces having the same total roughness but different sea-swell compositions are shown to result in significantly different scattering patterns. C1 USN,OCEAN RES & DEV ACT,BAY ST LOUIS,MS 39529. RP NOVARINI, JC (reprint author), PLANNING SYST INC,4455 AVE A,LONG BEACH,MS 39560, USA. NR 11 TC 0 Z9 0 U1 0 U2 0 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0001-4966 J9 J ACOUST SOC AM JI J. Acoust. Soc. Am. PD OCT PY 1992 VL 92 IS 4 BP 2099 EP 2108 DI 10.1121/1.405261 PN 1 PG 10 WC Acoustics; Audiology & Speech-Language Pathology SC Acoustics; Audiology & Speech-Language Pathology GA JT538 UT WOS:A1992JT53800033 ER PT J AU FEUILLADE, C CLAY, CS AF FEUILLADE, C CLAY, CS TI SOURCE IMAGING AND SIDELOBE SUPPRESSION USING TIME-DOMAIN TECHNIQUES IN A SHALLOW-WATER WAVE-GUIDE SO JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA LA English DT Article ID SIGNAL TRANSMISSION; SOURCE LOCATION; WAVE-GUIDE; OPTIMUM AB Source localization in a shallow-water waveguide, using harmonic (cw) techniques, is typically complicated by the repetitive sidelobe structure of the acoustic field. For this reason, much interest has been shown recently in the development and implementation of time-domain methods, which should achieve better performance because of their additional frequency-averaging capability. In a previous publication [C. S. Clay, J. Acoust. Soc. Am. 81, 660-664 (1987)], the basis for optimum signal transmission and source localization in a waveguide using time-domain techniques was described. In this present work a simple two-layer Pekeris model with shallow water depth (20 m) and short range (1500 m) has been used to compute image resolution and sidelobe suppression as a function of frequency bandwidth, number of modes, and the number of receivers in an array. The results indicate that source localization performance is most strongly dependent upon the bandwidth and number of modes available to carry the signal transmission. The physical mechanism for narrowing the source image and suppressing sidelobes is spatial averaging of the acoustic field due to variation of the horizontal wave numbers for the modes as a function of frequency. Improvements in mode sampling, by increasing the number of receivers, also reduced the level of sidelobes, but did not improve the resolution of the image. C1 UNIV WISCONSIN,GEOPHYS & POLAR RES CTR,MADISON,WI 53706. RP FEUILLADE, C (reprint author), USN,RES LAB,BAY ST LOUIS,MS 39529, USA. NR 12 TC 11 Z9 12 U1 0 U2 0 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0001-4966 J9 J ACOUST SOC AM JI J. Acoust. Soc. Am. PD OCT PY 1992 VL 92 IS 4 BP 2165 EP 2172 DI 10.1121/1.405228 PN 1 PG 8 WC Acoustics; Audiology & Speech-Language Pathology SC Acoustics; Audiology & Speech-Language Pathology GA JT538 UT WOS:A1992JT53800038 ER PT J AU LUCKE, RL SIRLIN, SW SANMARTIN, AM AF LUCKE, RL SIRLIN, SW SANMARTIN, AM TI NEW DEFINITIONS OF POINTING STABILITY - AC AND DC EFFECTS SO JOURNAL OF THE ASTRONAUTICAL SCIENCES LA English DT Article AB For most imaging sensors, a constant (DC) pointing error is unimportant (unless large!), but time-dependent (AC) errors degrade performance by either distorting or smearing the image. When properly quantified, the separation of the root-mean-square effects of random line-of-sight motions into DC and AC components can be used to obtain the minimum necessary line-of-sight stability specifications. The relation between stability requirements and sensor resolution is discussed, with a view to improving communication between the data analyst and the control systems engineer. C1 JET PROP LAB,PASADENA,CA 91109. RP LUCKE, RL (reprint author), USN,RES LAB,CODE 7604,WASHINGTON,DC 20375, USA. NR 18 TC 11 Z9 12 U1 2 U2 6 PU AMER ASTRONAUTICAL SOC PI SPRINGFIELD PA 6352 ROLLING MILL PLACE SUITE 102, SPRINGFIELD, VA 22152 SN 0021-9142 J9 J ASTRONAUT SCI JI J. Astronaut. Sci. PD OCT-DEC PY 1992 VL 40 IS 4 BP 557 EP 576 PG 20 WC Engineering, Aerospace SC Engineering GA KK273 UT WOS:A1992KK27300008 ER PT J AU JONES, RL AF JONES, RL TI THERMOGRAVIMETRIC STUDY OF THE 800-DEGREES-C REACTION OF ZIRCONIA STABILIZING OXIDES WITH SO3-NAVO3 SO JOURNAL OF THE ELECTROCHEMICAL SOCIETY LA English DT Article ID CORROSION; COATINGS AB A thermogravimetric study was made of the reaction of the zirconia stabilizing oxides, In2O3, Sc2O3, Y2O3, and MgO, with molten NaVO3 at 800-degrees-C under SO3 partial pressures of 10(+2) to 10(-3) Pa. The melt composition is determined by: 2NaVO3 + SO3 reversible V2O5 + Na2SO4. No reaction of In2O3 was found at SO3 partial pressures up to 5 x 10(+1) Pa where the reaction, In2O3 + V2O5 = 2InVO4, commenced. Reaction of Sc2O3 occurred at about 5 x 10(-1) Pa of SO3, with SCVO4 formed. Reaction of Y2O3 and MgO with the NaVO3 melt began, on the other hand, at SO3 partial pressures too low to be measured (<10(-3) Pa). In2O3 and SC2O3 are thus potentially superior to Y2O3 and MgO as stabilizers for hot corrosion resistant zirconia thermal barrier coatings. Certain other information concerning the thermochemistry of the SO3-NaVO3 system was also revealed. RP JONES, RL (reprint author), USN,RES LAB,DIV CHEM,WASHINGTON,DC 20375, USA. NR 14 TC 14 Z9 14 U1 1 U2 3 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 OCT PY 1992 VL 139 IS 10 BP 2794 EP 2799 DI 10.1149/1.2068981 PG 6 WC Electrochemistry; Materials Science, Coatings & Films SC Electrochemistry; Materials Science GA JR764 UT WOS:A1992JR76400019 ER PT J AU GODBEY, DJ KRIST, AH HOBART, KD TWIGG, ME AF GODBEY, DJ KRIST, AH HOBART, KD TWIGG, ME TI SELECTIVE REMOVAL OF SI1-XGEX FROM (100)-SI USING HNO3 AND HF SO JOURNAL OF THE ELECTROCHEMICAL SOCIETY LA English DT Article ID WAVELENGTH INFRARED DETECTORS; INTERSUBBAND ABSORPTION; SI0.7GE0.3 LAYER; ETCH STOP; SILICON; SUPERLATTICES; SIGE AB The selective removal of epitaxial Si1-xGex from (100) Si using an aqueous based etch consisting of nitric acid and trace hydrofluoric acid has been studied with respect to alloy composition, reaction mechanism, and surface smoothness. Selectivity, defined as the rate ratio of the Si1-xGex layer removal to the (100) Si layer removal, was better than 100 for a 30% Ge alloy layer with an etch consisting of 35:20:10, HNO3:H2O:HF (0.5%). The alloy etch rate increased with increasing Ge composition of the alloy in the germanium composition range of 10-50%. The presence of misfit dislocations was found to increase the etch rate compared to a fully strained alloy. RP GODBEY, DJ (reprint author), USN,RES LAB,DIV ELECTR SCI & TECHNOL,WASHINGTON,DC 20375, USA. NR 17 TC 25 Z9 26 U1 0 U2 4 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 OCT PY 1992 VL 139 IS 10 BP 2943 EP 2947 DI 10.1149/1.2069012 PG 5 WC Electrochemistry; Materials Science, Coatings & Films SC Electrochemistry; Materials Science GA JR764 UT WOS:A1992JR76400050 ER PT J AU HEWETT, CA DELAHOUSSAYE, PR ROSER, M ZEIDLER, JR WILSON, RG AF HEWETT, CA DELAHOUSSAYE, PR ROSER, M ZEIDLER, JR WILSON, RG TI COMPARATIVE HALL MOBILITIES OF ION-IMPLANTED BORON AND IMPLANTED CARBON PLUS BORON IN INSULATING DIAMOND SO JOURNAL OF THE ELECTROCHEMICAL SOCIETY LA English DT Article ID DOPANT ATOMS; ACTIVATION AB Natural type IIa (insulating) diamonds were implanted at liquid nitrogen temperature with either boron or carbon plus boron. Van der Pauw resistivity and Hall effect measurements as a function of temperature were used to determine the effect of the implantation, in comparison with the unimplanted side of the sample. Implantation with carbon plus boron resulted in a carrier concentration more than an order of magnitude greater than that resulting from implantation with boron alone, but with a much lower hole mobility. C1 HUGHES RES LABS,MALIBU,CA 90265. RP HEWETT, CA (reprint author), USN,CTR OCEAN SYST,SAN DIEGO,CA 92152, USA. NR 14 TC 4 Z9 4 U1 1 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 OCT PY 1992 VL 139 IS 10 BP 2977 EP 2979 DI 10.1149/1.2069019 PG 3 WC Electrochemistry; Materials Science, Coatings & Films SC Electrochemistry; Materials Science GA JR764 UT WOS:A1992JR76400057 ER PT J AU WYMAN, JF SERVE, MP HOBSON, DW LEE, LH UDDIN, DE AF WYMAN, JF SERVE, MP HOBSON, DW LEE, LH UDDIN, DE TI ACUTE TOXICITY, DISTRIBUTION, AND METABOLISM OF 2,4,6-TRINITROPHENOL (PICRIC ACID) IN FISCHER 344 RATS SO JOURNAL OF TOXICOLOGY AND ENVIRONMENTAL HEALTH LA English DT Article AB Picric acid (2,4,6-trinitrophenol) is widely used in industry, by the military, and as a research/clinical chemistry reagent. Characterization of the toxicity of this chemical has been limited. Thus the acute toxicity, distribution, and metabolism of picric acid were investigated using Fischer 344 rats. The LD50 for picric acid following oral dosing of male and female rats was established as 290 and 200 mg/kg, respectively. Blood gas analysis indicated severe acidosis during acute intoxication. Metabolism of picric acid was limited to reduction of nitro groups to amines. Metabolites isolated from urine included N-acetylisopicramic acid (14.8%), picramic acid (18.5%), N-acetylpicramic acid (4.7%), and unidentified components (2.4%). Approximately 60% of the parent picric acid was excreted unchanged. The plasma half-life for picric acid was 13.4 h with a gut absorption coefficient (k(a)) of 0.069 h-1. Twenty-four hours following oral administration of [C-14]picric acid (100 mg/kg), the primary depots of radioactivity (per gram tissue basis) were blood, spleen, kidney, liver lung, and testes. Respective tissue/blood ratios were 0.37, 0.31, 0.28, 0.26, and 0,22. All other tissue assayed had partition ratios < 0.20, with brain and adipose tissue having the least amount of radioactivity Tissue/blood ratios were essentially maintained over a 48-h postadministration period. Binding (in vitro) of [C-14]picric acid to plasma proteins (whole blood preparations) demonstrated both high- and low-affinity binding sites, with dissociation constants of 3.18 x 10(-6) and 2.85 x 10(-4) M, respectively. The findings of this investigation provide information on the acute toxicity, metabolism, and distribution of picric acid, which can be used in risk assessment analyses and in the design of subchronic and chronic toxicity tests. C1 WRIGHT STATE UNIV,DEPT CHEM,DAYTON,OH 45435. RP WYMAN, JF (reprint author), USN,MED RES INST DETACHMENT TOXICOL,WRIGHT PATTERSON AFB,OH 45433, USA. NR 22 TC 51 Z9 51 U1 0 U2 9 PU TAYLOR & FRANCIS PI BRISTOL PA 1900 FROST ROAD, SUITE 101, BRISTOL, PA 19007-1598 SN 0098-4108 J9 J TOXICOL ENV HEALTH JI J. Toxicol. Environ. Health PD OCT PY 1992 VL 37 IS 2 BP 313 EP 327 PG 15 WC Environmental Sciences; Public, Environmental & Occupational Health; Toxicology SC Environmental Sciences & Ecology; Public, Environmental & Occupational Health; Toxicology GA JU775 UT WOS:A1992JU77500007 PM 1404487 ER PT J AU LIGRANI, PM CIRIELLO, S BISHOP, DT AF LIGRANI, PM CIRIELLO, S BISHOP, DT TI HEAT-TRANSFER, ADIABATIC EFFECTIVENESS, AND INJECTANT DISTRIBUTIONS DOWNSTREAM OF A SINGLE ROW AND 2 STAGGERED ROWS OF COMPOUND ANGLE FILM-COOLING HOLES SO JOURNAL OF TURBOMACHINERY-TRANSACTIONS OF THE ASME LA English DT Article AB Experimental results are presented that describe the development and structure flow downstream of one row and downstream of two staggered rows of film-cooling holes with compound angle orientations. With the compound angle configuration, holes are inclined at 35 deg with respect to the test surface when projected into the streamwise/normal plane, and 30 deg with respect to the test surface when projected into the spanwise/normal plane. Within each row, holes are spaced 7.8 hole diameters apart, which gives 3.9d spacing between adjacent holes for the staggered row arrangement. Results presented include disributions of iso-energetic Stanton numbers, and adiabatic film cooling effectiveness deduced from Stanton numbers using superpositiion. Also presented are plots showing the streamwise development of injectant distributions and streamwise development of mean velocity distributions. Spanwise-averaged values of the adiabatic film cooling effectivenss, etaBAR, measured downstream of two staggered rows of holes are highest with a blowing ratio m of 0.5, and decrease with blowing ratio because of injection lift-off effects for x/d < 20. However, as the boundary layers convect farther downstream, etaBAR values for m =0.5 are lower than values for m = 1.0, 1.5, and 1.74 since smaller amounts of injectant are spread along the test surface. These differences also result because injectant from the upstream row of holes eventually merges and coalesces with the injectant from the downstream row of holes (of the two staggered rows) at the higher m. With one row of holes, local effectivenss variations are spanwise periodic, where higher values correspond to locations where injectant is plentiful near the test surface. Local St(f)/St(o) data also show spanwise periodicity, with local St(f)/St(o) maxima corresponding to regions of higher mixing between streamwise velocity deficits. Spanwise-averaged iso-energetic Stanton number ratios downstream of both the one-row and two-row arrangements generally range between 1.0 and 1.25, and show little variation with x/d for each value of m tested. Ho wever, for each x/d St(f)/St(o) values increase with m. Additional discussion of these results is presented along with comparisons to ones obtained downstream of film cooling holes with simple angles in which holes are inclined at 35 deg with respect to the test surface in the streamwise/normal plane. C1 USN,DEPT MECH ENGN,MONTEREY,CA 93943. RP LIGRANI, PM (reprint author), UNIV UTAH,DEPT MECH ENGN,SALT LAKE CITY,UT 84112, USA. NR 22 TC 34 Z9 34 U1 3 U2 7 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 OCT PY 1992 VL 114 IS 4 BP 687 EP 700 DI 10.1115/1.2928021 PG 14 WC Engineering, Mechanical SC Engineering GA JV656 UT WOS:A1992JV65600001 ER PT J AU SISE, MJ IVY, ME MALANCHE, R RANBARGER, KR AF SISE, MJ IVY, ME MALANCHE, R RANBARGER, KR TI POLYTETRAFLUOROETHYLENE INTERPOSITION GRAFTS FOR CAROTID RECONSTRUCTION SO JOURNAL OF VASCULAR SURGERY LA English DT Article; Proceedings Paper CT 7TH ANNUAL MEETING OF THE WESTERN VASCULAR SOC CY JAN 11-15, 1992 CL MAUI, HI SP W VASC SOC ID TERM FOLLOW-UP; TECHNICAL DEFECTS; ENDARTERECTOMY; STENOSIS; VEIN; RESTENOSIS; STROKE; ARTERY; PATCH AB Polytetrafluoroethylene interposition grafts were used for carotid reconstruction in 26 operations performed in 23 patients during a 7-year period. There were 10 men and 13 women with a mean age of 66 years. The indication for interposition graft placement was recurrent stenosis with inability to perform endarterectomy in nine operations, a severe kink or technical problem during endarterectomy in nine, aneurysmal changes of the artery in six, and thrombosis of the endarterectomy site segment with stroke in two. There were no perioperative deaths and no further perioperative neurologic complications. Follow-up with performance of yearly duplex scans was obtained in all patients, and the mean duration of follow-up was 36 months. One patient (4%) died of end-stage pulmonary disease during the study interval. Occlusion of the polytetrafluoroethylene graft occurred at 12 months in one patient (4%). Hemodynamically significant restenosis developed in two patients (8%), and two patients (8%) had mild restenosis. Evidence of a second restenosis developed in three of the nine patients who underwent polytetrafluoroethylene interposition graft placement for carotid restenosis. On the basis of our study results, we conclude that polytetrafluoroethylene can be used effectively for carotid reconstruction when an interposition graft is required. However, recurrent stenosis occurs. Patients who undergo polytetrafluoroethylene interposition graft placement for carotid restenosis appear to be at high risk for a second restenosis. C1 USN HOSP,DEPT SURG,DIV VASC SURG,SAN DIEGO,CA 92134. RP SISE, MJ (reprint author), USN HOSP,DEPT CLIN INVEST,SAN DIEGO,CA 92134, USA. NR 21 TC 16 Z9 17 U1 0 U2 0 PU MOSBY-YEAR BOOK INC PI ST LOUIS PA 11830 WESTLINE INDUSTRIAL DR, ST LOUIS, MO 63146-3318 SN 0741-5214 J9 J VASC SURG JI J. Vasc. Surg. PD OCT PY 1992 VL 16 IS 4 BP 601 EP 608 PG 8 WC Surgery; Peripheral Vascular Disease SC Surgery; Cardiovascular System & Cardiology GA JT812 UT WOS:A1992JT81200010 PM 1404680 ER PT J AU CONNER, CS DEVISSER, AM AF CONNER, CS DEVISSER, AM TI A LABORATORY INVESTIGATION OF PARTICLE-SIZE EFFECTS ON AN OPTICAL BACKSCATTERANCE SENSOR SO MARINE GEOLOGY LA English DT Article ID SUSPENDED-SOLIDS SENSORS AB The effect of particle size on an optical backscatterance sensor's (OBS) response to suspended sediment concentration was investigated in the laboratory. Sieved ground glass was used in place of natural sediments to eliminate mineralogical effects. Highly reliable linear regressions of OBS output versus suspended sediment concentration were obtained for suspensions of constant particle size. Regression analyses were conducted to determine an empirical relationship between OBS gain and particle size; an inverse power law regression best fit the data. A regression based upon Mie's theory also fit within the error bands of the data, suggesting the theory may be applicable to OBS performance. Results indicate that the OBS is most sensitive to particle size changes for particles 100 mum or less. RP CONNER, CS (reprint author), USN,CIVIL ENGN LAB,DEPT OCEAN ENGN,PORT HUENEME,CA 93043, USA. NR 13 TC 44 Z9 44 U1 1 U2 7 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0025-3227 J9 MAR GEOL JI Mar. Geol. PD OCT PY 1992 VL 108 IS 2 BP 151 EP 159 DI 10.1016/0025-3227(92)90169-I PG 9 WC Geosciences, Multidisciplinary; Oceanography SC Geology; Oceanography GA JX522 UT WOS:A1992JX52200001 ER PT J AU DAWSON, WW HOPE, GM DAWSON, JC NACHTIGALL, PE SCHROEDER, JP AF DAWSON, WW HOPE, GM DAWSON, JC NACHTIGALL, PE SCHROEDER, JP TI CETACEAN LENS ZONES OF DISCONTINUITY - INDEXES OF HEALTH AND DEVELOPMENT SO MARINE MAMMAL SCIENCE LA English DT Article DE CETACEAN; AGE; HEALTH; LENS; ZONES AB Details of the lenses of eyes in two living Tursiops truncatus and one Grampus griseus were photographed. In the laboratory the lens cortex could be retro-illuminated by a fundus camera and spatially periodic stria could be visualized, in large part because of the highly developed tapetum of the cetacean eye. Varying spaces were present between the stria. On a three-dimensional basis, the best analogy is the layering of an onion. One photograph was digitized giving good quantification of the sizes of the layers and their number. Similar, but less easily resolved, lens cortex organization has been described frequently in humans as "zones of optical discontinuity." These have been explained as a periodic temporal consequence of normal aging with layer thickness depending on general health. We found that young cetaceans have few "zones" and older cetaceans have many. Lens zones measurement may be developed to provide objective data on history of cetacean health and age. C1 UNIV FLORIDA,CTR STUDENT HLTH SERV,GAINESVILLE,FL 32611. USN,HAWAII LAB,KAILUA,HI 96734. RP DAWSON, WW (reprint author), UNIV FLORIDA,COLL MED,HLTH SCI CTR,DEPT OPHTHALMOL,BOX J284,GAINESVILLE,FL 32610, USA. NR 12 TC 2 Z9 2 U1 0 U2 1 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 OCT PY 1992 VL 8 IS 4 BP 379 EP 386 DI 10.1111/j.1748-7692.1992.tb00052.x PG 8 WC Marine & Freshwater Biology; Zoology SC Marine & Freshwater Biology; Zoology GA JV058 UT WOS:A1992JV05800004 ER PT J AU FLIPPEN, LD AF FLIPPEN, LD TI ABSTRACT ZWANZIG MODEL-REDUCTION THEORY WITH APPLICATION TO DISCRETIZED LINEAR-SYSTEMS SO MATHEMATICAL AND COMPUTER MODELLING LA English DT Article AB A formalism is given for mathematically synthesizing reduced, simpler mathematical models from more complex mathematical models which represent the behavior of a physical system. The models to be reduced usually consist of governing differential or integro-differential equations, boundary conditions and (if relevant) initial conditions. The formalism consists of an abstraction of a projection operator method pioneered by Zwanzig and others for nonequilibrium statistical mechanics. Two current model reduction methods which are based on this formalism, here called the operator-function and quantum scattering analogue methods, are also abstracted in this paper. The background and expertise required to apply model reduction methods to a given problem is often inhibiting to the more widespread use of such methods. Since most linear problems of sufficient complexity are ultimately discretized into a finite system of equations for solution on a computer, a method of model reduction applicable to arbitrary square matrices of finite dimension could be used as a "black box" algorithm generic to problems with widely differing physics. The model reduction formalism of this paper is used to derive such a model reduction method. The resulting algorithm reduces the number of degrees of freedom in the system while maintaining accuracy in the full solution, an attribute it shares with the static condensation algorithm widely used in finite element codes. RP FLIPPEN, LD (reprint author), USN, RES LAB, 4555 OVERLOOK AVE SW, WASHINGTON, DC 20375 USA. NR 20 TC 0 Z9 0 U1 1 U2 1 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLAND SN 0895-7177 J9 MATH COMPUT MODEL JI Math. Comput. Model. PD OCT PY 1992 VL 16 IS 10 BP 121 EP 134 PG 14 WC Computer Science, Interdisciplinary Applications; Computer Science, Software Engineering; Mathematics, Applied SC Computer Science; Mathematics GA JR031 UT WOS:A1992JR03100011 ER PT J AU THOMAS, CW UNGERSMA, JA AF THOMAS, CW UNGERSMA, JA TI THE VALUE OF DENTAL RADIOGRAPHIC EQUIPMENT IN A NAVY FIELD HOSPITAL SO MILITARY MEDICINE LA English DT Article AB The portable dental X-ray machine has been used to augment standard field x-ray equipment. This allows for more rapid assessment of combat casualties. The data presented describe the use of the portable dental X-ray machine during the 100-hour ground war against Iraq. RP THOMAS, CW (reprint author), USN HOSP,DEPT CLIN INVEST,SAN DIEGO,CA 92134, 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 OCT PY 1992 VL 157 IS 10 BP 539 EP 542 PG 4 WC Medicine, General & Internal SC General & Internal Medicine GA JT877 UT WOS:A1992JT87700014 PM 1454178 ER PT J AU KAXIRAS, E BOYER, LL AF KAXIRAS, E BOYER, LL TI EXPLORING THE STRUCTURE OF SOLIDS THROUGH MAGIC STRAINS - PREDICTION OF A NEW METALLIC PHASE OF SI SO MODELLING AND SIMULATION IN MATERIALS SCIENCE AND ENGINEERING LA English DT Article ID MOLECULAR-DYNAMICS; LIQUID SILICON; GE; GERMANIUM; PRESSURE AB A new approach that allows thorough exploration of low-energy structures with arbitrary symmetry for any material is presented, along with an application to silicon. This approach, coupled with first-principles total-energy calculations, has led us to discover a previously unknown metastable structure of Si. The physical properties of this structure and the insight they afford to metallic versus covalent bonding and the nature of the amorphous and liquid phases are discussed. C1 HARVARD UNIV, DIV APPL SCI, CAMBRIDGE, MA 02138 USA. USN, RES LAB, COMPLEX SYST THEORY BRANCH, WASHINGTON, DC 20375 USA. RP HARVARD UNIV, DEPT PHYS, CAMBRIDGE, MA 02138 USA. NR 20 TC 10 Z9 10 U1 1 U2 2 PU IOP PUBLISHING LTD PI BRISTOL PA TEMPLE CIRCUS, TEMPLE WAY, BRISTOL BS1 6BE, ENGLAND SN 0965-0393 EI 1361-651X J9 MODEL SIMUL MATER SC JI Model. Simul. Mater. Sci. Eng. PD OCT PY 1992 VL 1 IS 1 BP 91 EP 100 DI 10.1088/0965-0393/1/1/009 PG 10 WC Materials Science, Multidisciplinary; Physics, Applied SC Materials Science; Physics GA MP244 UT WOS:A1992MP24400010 ER PT J AU HIRSCHBERG, PA FRITSCH, JM AF HIRSCHBERG, PA FRITSCH, JM TI TROPOPAUSE UNDULATIONS AND THE DEVELOPMENT OF EXTRATROPICAL CYCLONES .2. DIAGNOSTIC-ANALYSIS AND CONCEPTUAL-MODEL - REPLY SO MONTHLY WEATHER REVIEW LA English DT Letter ID EVENT C1 PENN STATE UNIV,DEPT METEOROL,UNIV PK,PA 16802. RP HIRSCHBERG, PA (reprint author), USN,POSTGRAD SCH,DEPT METEOROL,MONTEREY,CA 93943, USA. NR 11 TC 3 Z9 3 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 OCT PY 1992 VL 120 IS 10 BP 2402 EP 2404 DI 10.1175/1520-0493(1992)120<2402:R>2.0.CO;2 PG 3 WC Meteorology & Atmospheric Sciences SC Meteorology & Atmospheric Sciences GA JR719 UT WOS:A1992JR71900020 ER PT J AU BERGSAGEL, PL TIMBLIN, CR ECKHARDT, L LASKOV, R KUEHL, WM AF BERGSAGEL, PL TIMBLIN, CR ECKHARDT, L LASKOV, R KUEHL, WM TI SEQUENCE AND EXPRESSION OF A MURINE CDNA-ENCODING PC326, A NOVEL GENE EXPRESSED IN PLASMACYTOMAS BUT NOT NORMAL PLASMA-CELLS SO ONCOGENE LA English DT Article ID TRANSLOCATED MYC GENE; C-MOS; SACCHAROMYCES-CEREVISIAE; MOUSE MYELOMA; BETA-SUBUNIT; G-PROTEIN; EXTINCTION; ONCOGENE; ENHANCER; HYBRIDS AB Using a subtractive cDNA approach we have identified a gene, PC326, expressed in 13 of 14 murine plasmacytoma cell lines, but not in any B- or pre-B-lymphoma cell lines. It expresses 4.6-kb and 5.2-kb mRNAs that encode a 747 amino acid protein containing two highly acidic domains flanking a novel, moderately acidic 20 amino acid sequence that is repeated 7.5 times. Sequence comparison identifies an additional 43 amino acid domain that is homologous to a repeated sequence found in the members of the beta-transducin gene family. The PC326 mRNA is detectable in testis but in no other murine tissues, including plasma cells induced by lipopolysaccharide stimulation of splenocytes. Somatic cell hybrids derived from plasmacytomas and fibroblast or T-cell lines have a fibroblastic or T-cell phenotype respectively. Unlike B-cell-specific genes (e.g. immunoglobulin), the expression of which is extinguished in these hybrids, PC326 mRNA appears to be irreversibly turned on in these hybrids. Since PC326 is not expressed in normal plasma cells, it appears that its expression is a cause or consequence of the tumorigenic process that generates murine plasmacytomas. C1 NCI, USN, MED ONCOL BRANCH, BLDG 8, ROOM 5101, BETHESDA, MD 20889 USA. COLUMBIA UNIV, DEPT BIOL SCI, NEW YORK, NY 10027 USA. HEBREW UNIV JERUSALEM, HADASSAH MED SCH, HUBERT H HUMPHREY CTR EXPTL MED & CANC RES, IL-91010 JERUSALEM, ISRAEL. NR 39 TC 14 Z9 14 U1 0 U2 0 PU NATURE PUBLISHING GROUP PI LONDON PA MACMILLAN BUILDING, 4 CRINAN ST, LONDON N1 9XW, ENGLAND SN 0950-9232 EI 1476-5594 J9 ONCOGENE JI Oncogene PD OCT PY 1992 VL 7 IS 10 BP 2059 EP 2064 PG 6 WC Biochemistry & Molecular Biology; Oncology; Cell Biology; Genetics & Heredity SC Biochemistry & Molecular Biology; Oncology; Cell Biology; Genetics & Heredity GA JP424 UT WOS:A1992JP42400021 PM 1408147 ER PT J AU RABINOVICH, WS GILBREATH, GC CLEMENT, AE FELDMAN, BJ AF RABINOVICH, WS GILBREATH, GC CLEMENT, AE FELDMAN, BJ TI PASSIVE STABILIZATION OF PHOTOREFRACTIVE 2-BEAM COUPLING WITH LASER-DIODES USING ACHROMATIC GRATING TECHNIQUES SO OPTICS COMMUNICATIONS LA English DT Article ID PHASE CONJUGATION; BATIO3; ARRAYS; POWER AB We show that two-beam coupling in BaTiO3, using a laser diode as the source, can be passively stabilized against mode hops and multi-longitudinal mode operation using achromatic grating techniques. RP RABINOVICH, WS (reprint author), USN,RES LAB,LASER PHYS BRANCH,WASHINGTON,DC 20375, USA. NR 21 TC 1 Z9 1 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0030-4018 J9 OPT COMMUN JI Opt. Commun. PD OCT 1 PY 1992 VL 93 IS 3-4 BP 156 EP 162 DI 10.1016/0030-4018(92)90521-R PG 7 WC Optics SC Optics GA JP319 UT WOS:A1992JP31900003 ER PT J AU CORREDOR, EL AF CORREDOR, EL TI LUKACS,GEORG - LIFE, THOUGHT, AND POLITICS - KADARKAY,A SO PHILOSOPHY AND LITERATURE LA English DT Book Review RP CORREDOR, EL (reprint author), USN,ANNAPOLIS,MD 21402, USA. NR 1 TC 0 Z9 0 U1 0 U2 0 PU JOHNS HOPKINS UNIV PRESS PI BALTIMORE PA JOURNALS PUBLISHING DIVISION, 2715 NORTH CHARLES ST, BALTIMORE, MD 21218-4319 SN 0190-0013 J9 PHILOS LITERATURE JI Philos. Lit. PD OCT PY 1992 VL 16 IS 2 BP 382 EP 383 PG 2 WC Literary Theory & Criticism; Literature SC Literature GA JT841 UT WOS:A1992JT84100015 ER PT J AU SELTZER, MD HILLS, ME GRUBER, JB AF SELTZER, MD HILLS, ME GRUBER, JB TI SITE-SELECTIVE POLARIZED SPECTROSCOPY OF TRIVALENT HOLMIUM-DOPED YTTRIUM-ALUMINUM-GARNET SO PHYSICAL REVIEW B LA English DT Article ID ENERGY-LEVELS AB Site-selective, polarized measurements of laser-induced fluorescence of Ho3+ ions in a specially oriented sample of yttrium aluminum garnet (YAG) are reported. To overcome the optical isotropy of the cubic YAG host, a sample was cut from a Ho3+:YAG boule in a manner that favored the excitation and detection of fluorescence from Ho3+ ions residing in specifically oriented sites in the YAG crystal lattice. Careful selection of crystal orientation, excitation and detection wavelengths, excitation-detection geometry, and polarization of incident and emitted radiation permitted analysis of Ho3+ ions on those sites. This approach facilitated the identification of the electric or magnetic dipole character of 25 selected excitation and emission transitions, and also provided data that support previous assignments of symmetry labels of the Stark levels involved in those transitions. C1 SAN JOSE STATE UNIV,DEPT PHYS,SAN JOSE,CA 95192. RP SELTZER, MD (reprint author), USN,CTR WARFARE,DIV WEAPONS,RES DEPT,DIV CHEM,CHINA LAKE,CA 93555, USA. NR 10 TC 6 Z9 6 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 OCT 1 PY 1992 VL 46 IS 13 BP 8007 EP 8012 DI 10.1103/PhysRevB.46.8007 PG 6 WC Physics, Condensed Matter SC Physics GA JT040 UT WOS:A1992JT04000005 ER PT J AU RIZOS, AK NGAI, KL AF RIZOS, AK NGAI, KL TI ANOMALOUS REDUCTION OF SOLVENT FRICTION IN CHLORINATED BIPHENYL SOLUTIONS OF 1,2-POLYBUTADIENE SO PHYSICAL REVIEW B LA English DT Article ID FLOW BIREFRINGENCE PROPERTIES; MARKOV-TREE MODEL; AROCLOR SOLUTIONS; CONDENSED MATTER; FREQUENCY-DEPENDENCE; SEGMENTAL RELAXATION; POLYSTYRENE AROCLOR; HAMILTONIAN-SYSTEMS; POLYMER-SOLUTIONS; PROBE DIFFUSION AB The rotational relaxation of the solvent chlorinated biphenyl, also known as Aroclor 1248, has been measured in solutions containing either 1,2-polybutadiene or other polymers by photon correlation spectroscopy. The data shows the solvent relaxation time decreases with the addition of 1,2-polybutadiene, which is unexpected from the reduction of solution-free-volume as indicated by the bulk polymer having a higher glass transition temperature than that of the neat solvent. This anomalous observed behavior, a reversal of the trend set by other polymer solutions, should have deep implications in the search for the correct method for accounting for changes in local friction in polymer solutions. We show that the coupling model provides a consistent interpretation of the data as well as related data of tracer diffusion in polymer solutions. C1 UNIV CRETE,DEPT CHEM,GR-7110 IRAKLION,GREECE. USN,RES LAB,WASHINGTON,DC 20375. RP RIZOS, AK (reprint author), RES CTR CRETE,POB 1527,GR-7110 IRAKLION,GREECE. RI Rizos, Apostolos/F-6807-2011 NR 38 TC 21 Z9 21 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD OCT 1 PY 1992 VL 46 IS 13 BP 8126 EP 8131 DI 10.1103/PhysRevB.46.8126 PG 6 WC Physics, Condensed Matter SC Physics GA JT040 UT WOS:A1992JT04000019 ER PT J AU STROM, U CULBERTSON, JC WOLF, SA GAO, F TANNER, DB CARR, GL AF STROM, U CULBERTSON, JC WOLF, SA GAO, F TANNER, DB CARR, GL TI FAR-INFRARED PHOTORESPONSE OF GRANULAR YBA2.1CU3.4O7-X SO PHYSICAL REVIEW B LA English DT Article ID SUPERCONDUCTING THIN-FILMS; JOSEPHSON-JUNCTION ARRAYS; SINGLE-DOMAIN YBA2CU3O7; CERMET FILMS; GAP; CONDUCTIVITY; TRANSITION; RADIATION; CRYSTALS; ENERGY AB The response of a granular film of YBa2.1Cu3.4O7-x to pulsed far-infrared light has been measured at temperatures which are near the resistive onset of the film. The photoresponse at 26.0 cm-1 is interpreted due to the direct modulation of intergrain Josephson currents ("current mode") by the incident far-infrared light. The observed dependence on far-infrared power (approximately P1/2) is consistent with a superconducting energy gap which is much larger than 26.0 cm-1. There is evidence for a current mode response at 87.7 and 152 cm-1, but with a greatly reduced photoresponse magnitude. The decrease in photoresponse measured at 87.7 and 152 cm-1 is attributed to intergrain capacitive effects. C1 UNIV FLORIDA,DEPT PHYS,GAINESVILLE,FL 32611. GRUMMAN AEROSP CORP,CORP RES CTR,BETHPAGE,NY 11714. RP STROM, U (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. RI Wolf, Stuart/A-7513-2009 NR 31 TC 12 Z9 12 U1 0 U2 1 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD OCT 1 PY 1992 VL 46 IS 13 BP 8472 EP 8479 DI 10.1103/PhysRevB.46.8472 PG 8 WC Physics, Condensed Matter SC Physics GA JT040 UT WOS:A1992JT04000061 ER PT J AU BARKYOUMB, JH MANSOUR, AN AF BARKYOUMB, JH MANSOUR, AN TI ELECTRONIC AND ATOMIC-STRUCTURE OF MN-DOPED CAF2 - AN X-RAY-ABSORPTION NEAR-EDGE STRUCTURE AND EXTENDED X-RAY-ABSORPTION FINE-STRUCTURE STUDY SO PHYSICAL REVIEW B LA English DT Article ID FLUORITE STRUCTURE; BAND-STRUCTURE; EXAFS; SPECTRA; COORDINATION; CRYSTAL; XANES; CDF2 AB X-ray-absorption near-edge structure (XANES) and extended-x-ray-absorption fine-structure (EXAFS) measurements have been performed on the calcium K edge and manganese K edge of CaF2 doped with manganese at molecular concentrations of 0.1-2.5 %. The results are compared to other measurements of the calcium K edge in CaF2 and the Mn K edge in various manganese compounds. Major features in the XANES spectra are tentatively identified with transitions to high-symmetry points of the CaF2 energy bands in a one-electron picture. Expected deviations from the structure predicted by the one-electron formalism are discussed. The EXAFS analysis shows a reduction in the manganese-fluorine distance of (3.9+/-0.4)% as compared to the calcium-fluorine separation in the doped or undoped samples. This compares well with previous results obtained by EPR. A significant increase in disorder of the first shell around the Mn dopant ion is observed as compared to the Ca ion. The significance of this shell contraction and disorder is discussed in terms of possible defect structures in the material. RP BARKYOUMB, JH (reprint author), USN,CTR WARFARE,DEPT RES & TECHNOL,SILVER SPRING,MD 20903, USA. NR 48 TC 40 Z9 40 U1 1 U2 3 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD OCT 1 PY 1992 VL 46 IS 14 BP 8768 EP 8776 DI 10.1103/PhysRevB.46.8768 PG 9 WC Physics, Condensed Matter SC Physics GA JV110 UT WOS:A1992JV11000006 ER PT J AU GRINSTEIN, FF KAILASANATH, K AF GRINSTEIN, FF KAILASANATH, K TI CHEMICAL ENERGY-RELEASE AND DYNAMICS OF TRANSITIONAL, REACTIVE SHEAR FLOWS SO PHYSICS OF FLUIDS A-FLUID DYNAMICS LA English DT Article ID TURBULENT MIXING LAYERS; DIRECT NUMERICAL SIMULATIONS; HEAT RELEASE; GLOBAL INSTABILITIES; FEEDBACK AB Results are reported from numerical studies of a compressible, subsonic reactive mixing layer, on the the effects of chemical-reaction exothermicity on the shear-layer development, and the dependence of these effects on initial conditions. The model solves the unsteady, conservation equations for mass, momentum, energy, and species concentrations. The convective transport equations are solved using the flux-corrected transport (FCT) algorithm and appropriate inflow and outflow boundary conditions. A one-step, irreversible, Arrhenius chemical reaction rate, and realistic (species- and temperature-dependent) modeling of diffusive transport are coupled with the convective transport using time-step splitting. The system studied consists of nonpremixed coflowing streams, where both the fuel (faster stream, hydrogen) and the oxidizer (slower stream, oxygen) are diluted in nitrogen. To facilitate the analysis of the results the flow is organized by low-level, single-frequency velocity perturbation at the inflow. The simulations show that energy release has the effect of reducing the shear layer growth and the amount of chemical product formed-relative to the corresponding cases for which exothermicity is not accounted for, in qualitative agreement with results from previous investigations. The relative mixing-layer growth reduction becomes more pronounced for larger energy release and lower Re, and is significant in terms of both, Reynolds stress, rhou'v'BAR, and the velocity-fluctuation correlation u'v'BAR. In spite of the relatively fast flows studied, for the regimes considered, the results on the initial mixing-layer growth are significantly sensitive to diffusive transport effects-more so in terms of Reynolds stress, than in terms of product formation. With larger energy release here associated to larger free-stream reactant molar fractions c0, the amount of chemical product in absolute terms is found to increase with energy release-but slower than c0, so that the product formation becomes effectively less efficient. The results of the present work highlight the difficulties involved in making general statements about the effects of exothermicity on the mixing-layer growth, indicating that a careful conceptualization of these properties in terms of initial conditions and other characteristic parameters of the reactive systems under study is required. RP GRINSTEIN, FF (reprint author), USN,RES LAB,COMPUTAT PHYS & FLUID DYNAM LAB,WASHINGTON,DC 20375, USA. NR 29 TC 17 Z9 18 U1 0 U2 0 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0899-8213 J9 PHYS FLUIDS A-FLUID PD OCT PY 1992 VL 4 IS 10 BP 2207 EP 2211 DI 10.1063/1.858462 PG 5 WC Mechanics; Physics, Fluids & Plasmas SC Mechanics; Physics GA JP619 UT WOS:A1992JP61900010 ER PT J AU AYRES, VM CHEN, HC STARK, RA UHM, HS BRANDT, HE AF AYRES, VM CHEN, HC STARK, RA UHM, HS BRANDT, HE TI DIOCOTRON INSTABILITY FOR RELATIVISTIC NONNEUTRAL ELECTRON FLOW IN PLANAR MAGNETRON GEOMETRY SO PHYSICS OF FLUIDS B-PLASMA PHYSICS LA English DT Article ID MODE STABILITY PROPERTIES; FIELD AB Diocotron stability properties of relativistic non-neutral electron flow in a planar magnetron are investigated within the framework of the cold-fluid-Maxwell equations. The eigenvalue equation for the extraordinary-mode waves in a relativistic velocity-sheared electron layer is obtained, and is solved in the massless, guiding-center approximation. Approximating the electromagnetic field in the anode resonator by the lowest-order mode, the dispersion relation for the diocotron instability is obtained. Although the tenuous beam approximation is assumed, the eigenvalue equation and corresponding dispersion relation are both fully electromagnetic, and valid for relativistic electron flow. The dispersion relation is numerically investigated for a broad range of system parameters. From numerical calculations of the dispersion relation, it is shown that the typical growth rate of the diocotron instability indicates a strong instability. The early evolution of the diocotron instability as an important precursor to the evolution of the full magnetron oscillation is discussed. C1 HARRY DIAMOND LABS,ADELPHI,MD 20783. RP AYRES, VM (reprint author), USN,CTR SURFACE WARFARE,WHITE OAK LAB,SILVER SPRING,MD 20903, USA. NR 28 TC 6 Z9 6 U1 0 U2 2 PU AMER INST PHYSICS PI MELVILLE PA CIRCULATION & FULFILLMENT DIV, 2 HUNTINGTON QUADRANGLE, STE 1 N O 1, MELVILLE, NY 11747-4501 USA SN 0899-8221 J9 PHYS FLUIDS B-PLASMA PD OCT PY 1992 VL 4 IS 10 BP 3396 EP 3406 DI 10.1063/1.860395 PG 11 WC Physics, Fluids & Plasmas SC Physics GA JR694 UT WOS:A1992JR69400040 ER PT J AU MURPHY, DP PECHACEK, RE TAGGART, DP FERNSLER, RF HUBBARD, RF SLINKER, SP MEGER, RA AF MURPHY, DP PECHACEK, RE TAGGART, DP FERNSLER, RF HUBBARD, RF SLINKER, SP MEGER, RA TI ELECTRON-BEAM TRACKING IN A PREFORMED DENSITY CHANNEL SO PHYSICS OF FLUIDS B-PLASMA PHYSICS LA English DT Article AB High-current charged particle beams can be guided by reduced density channels. Such guiding occurs when the distribution of plasma currents in the density channel causes a net attractive force to be exerted on the beam. In particular, a relativistic electron beam (REB) injected parallel to a spatially offset, reduced density channel is pulled toward the channel. The force exerted on the beam is predicted to increase as the beam current increases and as the offset between the beam and the channel increases out to offsets equal to the channel radius. An experiment with a 1 MV, almost-equal-to 10 kA beam was performed that demonstrates this effect. C1 LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545. RP MURPHY, DP (reprint author), USN,RES LAB,DIV PLASMA PHYS,WASHINGTON,DC 20375, USA. NR 31 TC 12 Z9 12 U1 0 U2 1 PU AMER INST PHYSICS PI MELVILLE PA CIRCULATION & FULFILLMENT DIV, 2 HUNTINGTON QUADRANGLE, STE 1 N O 1, MELVILLE, NY 11747-4501 USA SN 0899-8221 J9 PHYS FLUIDS B-PLASMA PD OCT PY 1992 VL 4 IS 10 BP 3407 EP 3417 DI 10.1063/1.860396 PG 11 WC Physics, Fluids & Plasmas SC Physics GA JR694 UT WOS:A1992JR69400041 ER PT J AU BOTTKA, N AF BOTTKA, N TI PROLOG TO THE SPECIAL SECTION ON CHEMICAL VAPOR-DEPOSITION SO PROCEEDINGS OF THE IEEE LA English DT Editorial Material C1 USN,RES LAB,WASHINGTON,DC 20375. NR 0 TC 0 Z9 0 U1 0 U2 0 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0018-9219 J9 P IEEE JI Proc. IEEE PD OCT PY 1992 VL 80 IS 10 BP 1590 EP 1591 PG 2 WC Engineering, Electrical & Electronic SC Engineering GA JY618 UT WOS:A1992JY61800005 ER PT J AU ROGERS, WO MALIK, A MELLOUK, S NAKAMURA, K ROGERS, MD SZARFMAN, A GORDON, DM NUSSLER, AK AIKAWA, M HOFFMAN, SL AF ROGERS, WO MALIK, A MELLOUK, S NAKAMURA, K ROGERS, MD SZARFMAN, A GORDON, DM NUSSLER, AK AIKAWA, M HOFFMAN, SL TI CHARACTERIZATION OF PLASMODIUM-FALCIPARUM SPOROZOITE SURFACE PROTEIN-2 SO PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA LA English DT Article DE MALARIA; VACCINE; THROMBOSPONDIN RELATED ANONYMOUS PROTEIN; T-CELL WESTERN BLOT; CIRCUMSPOROZOITE PROTEIN ID HUMAN MALARIA PARASITE; T-CELLS RECOGNIZE; CIRCUMSPOROZOITE PROTEIN; MONOCLONAL-ANTIBODIES; ANTIGEN; GENE; SEQUENCE; INVITRO; YOELII; ACID AB Immunization of mice with Plasmodium yoelii sporozoite surface protein 2 (PySSP2) and circumsporozoite protein protects completely against P. yoelii. The amino acid sequence of PySSP2 suggested that the thrombospondin-related anonymous protein (TRAP) [Robson, K. J. H., Hall, J. R. S., Jennings, M. W., Harris, T. J. R., Marsh, K., New-bold, C. I., Tate, V. E. & Weatherall, D. J. (1988) Nature (London) 335, 79-821 is the Plasmodium falciparum homolog of PySSP2. We report data confirming that TRAP is P. falciparum SSP2 (PfSSP2). Murine antibodies against recombinant PfSSP2 identify a 90-kDa protein in extracts of P. falciparum sporozoites, recognize sporozoites and infected hepatocytes by immunofluorescence, localize PfSSP2 to the sporozoite micronemes by immunoelectron microscopy and to the surface membrane by live immunofluorescence, and inhibit sporozoite invasion and development in hepatocytes in vitro. Human volunteers immunized with irradiated sporozoites and protected against malaria develop antibody and proliferative T-cell responses to PfSSP2, suggesting that, like PySSP2, PfSSP2 is a target of protective immunity, and supporting inclusion of PfSSP2 in a multicomponent malaria vaccine. C1 UNIV MARYLAND,SCH MED,CTR VACCINE DEV,BALTIMORE,MD 21201. CASE WESTERN RESERVE UNIV,INST PATHOL,CLEVELAND,OH 44106. US FDA,DIV ANTI INFECT DRUG PROD,ROCKVILLE,MD 20857. HENRY M JACKSON FDN ADV MIL MED,ROCKVILLE,MD 20852. UNIV PITTSBURGH,DEPT SURG,PITTSBURGH,PA 15261. WALTER REED ARMY MED CTR,DEPT IMMUNOL,WASHINGTON,DC 20307. RP ROGERS, WO (reprint author), USN,MED RES INST,MALARIA PROGRAM,BETHESDA,MD 20889, USA. NR 33 TC 175 Z9 177 U1 0 U2 3 PU NATL ACAD PRESS PI WASHINGTON PA 2101 CONSTITUTION AVE NW, WASHINGTON, DC 20418 SN 0027-8424 J9 P NATL ACAD SCI USA JI Proc. Natl. Acad. Sci. U. S. A. PD OCT 1 PY 1992 VL 89 IS 19 BP 9176 EP 9180 DI 10.1073/pnas.89.19.9176 PG 5 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA JQ934 UT WOS:A1992JQ93400066 PM 1409621 ER PT J AU BURKHALTER, PG MEHLMAN, G NEWMAN, DA KRISHNAN, M PRASAD, RR AF BURKHALTER, PG MEHLMAN, G NEWMAN, DA KRISHNAN, M PRASAD, RR TI QUANTITATIVE X-RAY-EMISSION FROM A DPF DEVICE SO REVIEW OF SCIENTIFIC INSTRUMENTS LA English DT Article; Proceedings Paper CT 9TH TOPICAL CONF ON HIGH TEMPERATURE PLASMA DIAGNOSTICS CY MAR 15-19, 1992 CL SANTA FE, NM SP AMER PHYS SOC, US DOE, OFF INERTIAL CONFINEMENT FUS, US DOE, OFF FUS ENERGY, DIV APPL PLASMA PHYS, SANDIA NATL LABS, INERTIAL CONFINEMENT FUS PROGRAM ID CALIBRATION; CRYSTAL; SPECTRA AB The x-ray emission was measured from a Dense Plasma Focus (DPF) device. The high density plasma is generated by an electrical discharge in rarefied-neon gas between electrodes in a Mather-type plasma focus configuration. A curved-crystal x-ray spectrograph, a pinhole camera, and an active-filtered photodiode were the diagnostics viewing the axial output of the pinched-plasma region. The x-ray pinhole images indicate a pinched volume roughly 8 mm in length with a nearly circular cross section of about 300 mum in diameter. The digitized spectral traces were computer processed to obtain absolute x-ray line intensities. The neon plasma yielded 10-15 J of K-shell radiation into 4pi with the hydrogenlike and heliumlike alpha lines totaling 55%-65% of the total spectral emission. The x-ray emission of the DPF device was studied as a function of discharge current and anode diameter. C1 SCI RES LAB INC,ALAMEDA,CA 94501. RP BURKHALTER, PG (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 14 TC 36 Z9 36 U1 1 U2 4 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 OCT PY 1992 VL 63 IS 10 BP 5052 EP 5055 DI 10.1063/1.1143489 PN 2 PG 4 WC Instruments & Instrumentation; Physics, Applied SC Instruments & Instrumentation; Physics GA JV133 UT WOS:A1992JV13300153 ER PT J AU WOOD, KS FELDMAN, U BECKER, PA NEMIROFF, RJ KANIA, DR AF WOOD, KS FELDMAN, U BECKER, PA NEMIROFF, RJ KANIA, DR TI A FOURIER-TRANSFORM MICROSCOPE FOR X-RAY-IMAGING SO REVIEW OF SCIENTIFIC INSTRUMENTS LA English DT Article; Proceedings Paper CT 9TH TOPICAL CONF ON HIGH TEMPERATURE PLASMA DIAGNOSTICS CY MAR 15-19, 1992 CL SANTA FE, NM SP AMER PHYS SOC, US DOE, OFF INERTIAL CONFINEMENT FUS, US DOE, OFF FUS ENERGY, DIV APPL PLASMA PHYS, SANDIA NATL LABS, INERTIAL CONFINEMENT FUS PROGRAM AB This is a progress report on development of a new x-ray imaging system, called a Fourier transform microscope, intended for use with x-ray emitting targets in laser fusion experiments. It is being built by Naval Research Laboratory and Lawrence Livermore National Laboratory. The system works at energies from 3 to 7 keV. We describe the development of the design, which utilizes fine etched grids to extract Fourier amplitudes for the source brightness distribution at selected spatial frequencies. The finest grids in the prototype system will have rib dimensions of 2 mum. The prototype system is expected to achieve position resolution of 4 mum in 3-7 keV. Simulations of the expected imaging performance are presented. C1 NASA,GODDARD SPACE FLIGHT CTR,GREENBELT,MD 20771. LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550. RP WOOD, KS (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 8 TC 1 Z9 1 U1 0 U2 0 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0034-6748 J9 REV SCI INSTRUM JI Rev. Sci. Instrum. PD OCT PY 1992 VL 63 IS 10 BP 5089 EP 5093 DI 10.1063/1.1143501 PN 2 PG 5 WC Instruments & Instrumentation; Physics, Applied SC Instruments & Instrumentation; Physics GA JV133 UT WOS:A1992JV13300164 ER PT J AU WEBER, BV HINSHELWOOD, DD AF WEBER, BV HINSHELWOOD, DD TI HE-NE INTERFEROMETER FOR DENSITY-MEASUREMENTS IN PLASMA OPENING SWITCH EXPERIMENTS SO REVIEW OF SCIENTIFIC INSTRUMENTS LA English DT Article; Proceedings Paper CT 9TH TOPICAL CONF ON HIGH TEMPERATURE PLASMA DIAGNOSTICS CY MAR 15-19, 1992 CL SANTA FE, NM SP AMER PHYS SOC, US DOE, OFF INERTIAL CONFINEMENT FUS, US DOE, OFF FUS ENERGY, DIV APPL PLASMA PHYS, SANDIA NATL LABS, INERTIAL CONFINEMENT FUS PROGRAM AB A He-Ne interferometer is used to measure the line-integrated electron density in the plasma of an operating plasma opening switch (POS). A heterodyne technique is used, where an acousto-optic modulator generates a 40-MHz frequency shift between the reference and scene beams. The phase shift is calculated numerically from the zero-crossing times of the beat signal. The precision of the phase measurement is +/- 0.5-degrees, however, several nonplasma sources of phase shift are present just after the current through the POS is interrupted. In particular, charged particle flow into the vacuum window results in a negative phase shift. This anomalous phase shift is effectively eliminated by using magnets to deflect the particles away from the window. Measurements during POS shots show a localized decrease in line density prior to current interruption. RP WEBER, BV (reprint author), USN,RES LAB,DIV PLASMA PHYS,WASHINGTON,DC 20375, USA. NR 9 TC 27 Z9 29 U1 0 U2 1 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0034-6748 J9 REV SCI INSTRUM JI Rev. Sci. Instrum. PD OCT PY 1992 VL 63 IS 10 BP 5199 EP 5201 DI 10.1063/1.1143428 PN 2 PG 3 WC Instruments & Instrumentation; Physics, Applied SC Instruments & Instrumentation; Physics GA JV133 UT WOS:A1992JV13300194 ER PT J AU DUTKA, AJ MINK, R MCDERMOTT, J CLARK, JB HALLENBECK, JM AF DUTKA, AJ MINK, R MCDERMOTT, J CLARK, JB HALLENBECK, JM TI EFFECT OF LIDOCAINE ON SOMATOSENSORY EVOKED-RESPONSE AND CEREBRAL BLOOD-FLOW AFTER CANINE CEREBRAL AIR-EMBOLISM SO STROKE LA English DT Article DE CEREBRAL BLOOD FLOW; EMBOLISM; EVOKED POTENTIALS, SOMATOSENSORY; LIDOCAINE; DOGS ID HYPERBARIC-OXYGEN; BRAIN ISCHEMIA; POTENTIALS; CONSUMPTION; METABOLISM; DEATH; EDEMA; DOGS; RATS AB Background and Purpose: Victims of air embolism often recover rapidly on hyperbaric treatment then deteriorate again, even if hyperbaric treatment is continued. In previous animal experiments, lidocaine has been shown to improve recovery of somatosensory evoked response amplitude after air embolism. However, animals in these experiments rarely deteriorated. We have shown that the induction of air embolism and transient hypertension in canines produces deterioration despite hyperbaric treatment, and we decided to test the effect of lidocaine on somatosensory evoked potential recovery and cerebral blood flow in this model. Methods: Dogs were treated with repeated doses of lidocaine or equivalent volumes of saline during hyperbaric therapy after internal carotid air embolism and transient hypertension. The investigators were unaware of treatment group assignment during the experiments. The amplitude of the median nerve somatosensory evoked potential and cerebral blood flow measured with carbon-14-labeled iodoantipyrine autoradiography were used to assess effect of therapy. Results: Lidocaine-treated dogs recovered 60+/-10% (mean+/-95% confidence limits) of the baseline somatosensory evoked potential amplitude 220 minutes after air embolism; saline-treated dogs recovered 32+/-10% (a significant difference at p<0.01). Lidocaine-treated dogs also had higher cerebral blood How values than saline-treated dogs 220 minutes after air embolism. Conclusions: Lidocaine ameliorated the delayed deterioration of evoked potential associated with air embolism and hypertension in this canine model. The improved cerebral blood flow may be a mechanism of action of lidocaine or an associated effect of improved neuronal survival. C1 USN, MED RES INST, BETHESDA, MD 20814 USA. CARDINAL GLENNON CHILDRENS HOSP, ST LOUIS, MO USA. USN, INST AEROSP MED, PENSACOLA, FL USA. NINCDS, STROKE BRANCH, BETHESDA, MD 20892 USA. RP USN, NATL MED CTR, DEPT NEUROL, BETHESDA, MD 20889 USA. OI Clark, Jonathan/0000-0002-1162-1238 NR 36 TC 32 Z9 33 U1 0 U2 1 PU LIPPINCOTT WILLIAMS & WILKINS PI PHILADELPHIA PA TWO COMMERCE SQ, 2001 MARKET ST, PHILADELPHIA, PA 19103 USA SN 0039-2499 EI 1524-4628 J9 STROKE JI Stroke PD OCT PY 1992 VL 23 IS 10 BP 1515 EP 1520 PG 6 WC Clinical Neurology; Peripheral Vascular Disease SC Neurosciences & Neurology; Cardiovascular System & Cardiology GA JQ018 UT WOS:A1992JQ01800029 PM 1412590 ER PT J AU BERMUDEZ, VM AF BERMUDEZ, VM TI STUDY OF THE INITIAL ADSORPTION OF NITROGEN ON SIC(100)-(2X1) SO SURFACE SCIENCE LA English DT Article ID THERMAL NITRIDATION; NITRIC-OXIDE; FILM GROWTH; SURFACE; SILICON; SI(111); NH3; SI(100); ATOMS; LEED AB The initial adsorption of nitrogen (by filament-assisted exposure to N2) on the SiC(100)-(2 x 1) surface at approximately 800-1000-degrees-C has been studied using Auger electron spectroscopy and low energy electron diffraction. N adsorbs at low coverage in either a c(2 x 6) or c(4 x 4) structure. At higher coverage, about two-thirds of a monolayer, a (1 x 3)-ordered layer forms and further adsorption is slow. A model is proposed for the (1 x 3)N structure involving rows of Si-N-Si bridges with every third row missing. RP BERMUDEZ, VM (reprint author), USN, RES LAB, WASHINGTON, DC 20375 USA. NR 35 TC 9 Z9 9 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0039-6028 EI 1879-2758 J9 SURF SCI JI Surf. Sci. PD OCT 1 PY 1992 VL 276 IS 1-3 BP 59 EP 68 DI 10.1016/0039-6028(92)90695-3 PG 10 WC Chemistry, Physical; Physics, Condensed Matter SC Chemistry; Physics GA JQ016 UT WOS:A1992JQ01600013 ER PT J AU VANKEUREN, DK AF VANKEUREN, DK TI SCIENCE, PROGRESSIVISM, AND MILITARY PREPAREDNESS - THE CASE OF THE NAVAL RESEARCH LABORATORY, 1915-1923 SO TECHNOLOGY AND CULTURE LA English DT Article RP VANKEUREN, DK (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 60 TC 3 Z9 3 U1 0 U2 0 PU UNIV CHICAGO PRESS PI CHICAGO PA 5720 S WOODLAWN AVE, CHICAGO, IL 60637 SN 0040-165X J9 TECHNOL CULT JI Technol. Cult. PD OCT PY 1992 VL 33 IS 4 BP 710 EP 736 DI 10.2307/3106587 PG 27 WC History & Philosophy Of Science SC History & Philosophy of Science GA JY490 UT WOS:A1992JY49000003 ER PT J AU VANKEUREN, DK AF VANKEUREN, DK TI THE 1ST GOLDEN-AGE OF ROCKETRY - CONGREVE AND HALE ROCKETS OF THE 19TH-CENTURY - WINTER,FH SO TECHNOLOGY AND CULTURE LA English DT Book Review RP VANKEUREN, DK (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 1 TC 0 Z9 0 U1 0 U2 0 PU UNIV CHICAGO PRESS PI CHICAGO PA 5720 S WOODLAWN AVE, CHICAGO, IL 60637 SN 0040-165X J9 TECHNOL CULT JI Technol. Cult. PD OCT PY 1992 VL 33 IS 4 BP 836 EP 838 DI 10.2307/3106617 PG 3 WC History & Philosophy Of Science SC History & Philosophy of Science GA JY490 UT WOS:A1992JY49000033 ER PT J AU POLITZER, P MURRAY, JS SEMINARIO, JM MILLER, RS AF POLITZER, P MURRAY, JS SEMINARIO, JM MILLER, RS TI COMPUTATIONAL ANALYSIS OF THE DINITRAMINE AND CHLORINE DERIVATIVES OF BENZENE AND S-TETRAZINE SO THEOCHEM-JOURNAL OF MOLECULAR STRUCTURE LA English DT Article ID N-6 ENERGY HYPERSURFACE; LOCAL IONIZATION ENERGIES; MOLECULAR-SURFACE; STABLE POINTS; TRIPLE DISSOCIATION; COMPLEXES; NITRO; PHOTOCHEMISTRY; SUBSTITUENTS; ABINITIO AB Optimized HF/3-21G* geometries were computed for s-tetrazine (1) and for the dinitramine and chlorine derivatives of I and of benzene. These structures were used to calculate the electrostatic potentials and average local ionization energies of these molecules. HF/3-21G* and MP2/6-31G* geometries were also computed for pentazine (VI), which is as yet unknown, and shown to correspond to energy minima. The electrostatic potential on the surface of I is strongly negative above the electron-attracting ring nitrogen atoms and positive above the ring and the hydrogen atoms, fully consistent with the structures of complexes that s-tetrazine is known to form with other molecules. Previously developed relationships were used to estimate the Hammett constants sigma(m) and sigma(p) of the dinitramine group, N(NO2)2, and the pK(a) values of s-tetrazine, its dinitramine and chlorine derivatives, and pentazine. N(NO2)2 is found to be strongly electron withdrawing through induction and more weakly donating through resonance. In the s-tetrazine derivatives, the electron attracting power of the ring nitrogen atoms significantly increases the extents of conjugation of the N(NO2)2 and Cl, both resonance donors. However, the dominant effect of these substituents upon the ring is inductive deactivation toward electrophiles. C1 USN,OFF RES,DIV MECH,ARLINGTON,VA 22217. RP POLITZER, P (reprint author), UNIV NEW ORLEANS,DEPT CHEM,NEW ORLEANS,LA 70148, USA. RI Seminario, Jorge/C-9646-2012 NR 63 TC 4 Z9 4 U1 0 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0166-1280 J9 THEOCHEM-J MOL STRUC JI Theochem-J. Mol. Struct. PD OCT PY 1992 VL 94 BP 155 EP 170 PG 16 WC Chemistry, Physical SC Chemistry GA JY610 UT WOS:A1992JY61000014 ER PT J AU HORSTMAN, WG SANDS, JP HOOPER, DG AF HORSTMAN, WG SANDS, JP HOOPER, DG TI ADENOMATOID TUMOR OF TESTICLE SO UROLOGY LA English DT Article AB A rare case of intratesticular adenomatoid tumor is described. Pathologically and clinically this tumor is associated with the seminiferous tubules and the rete testis. The patient underwent left inguinal exploration to confirm the testicular tumor. A radical orchiectomy was performed. We believe this is the first case of documented intratesticular adenomatoid tumor that did not arise from either tunica albuginea or epididymis. The cytologic origin of adenomatoid tumors and an unusual finding of decreased spermatogenesis with marked atrophy of the testes are also presented. C1 USN HOSP,DEPT UROL,SAN DIEGO,CA 92134. USN HOSP,DEPT LAB MED,DIV MICROBIOL,SAN DIEGO,CA 92134. RP HORSTMAN, WG (reprint author), USN HOSP,DEPT CLIN INVEST,SAN DIEGO,CA 92134, USA. NR 10 TC 15 Z9 17 U1 0 U2 1 PU CAHNERS PUBL CO PI NEW YORK PA 249 WEST 17 STREET, NEW YORK, NY 10011 SN 0090-4295 J9 UROLOGY JI UROLOGY PD OCT PY 1992 VL 40 IS 4 BP 359 EP 361 DI 10.1016/0090-4295(92)90390-I PG 3 WC Urology & Nephrology SC Urology & Nephrology GA KH662 UT WOS:A1992KH66200016 PM 1413358 ER PT J AU BAUS, TA CHEN, YM AF BAUS, TA CHEN, YM TI A NUMERICAL-METHOD FOR ELECTROMAGNETIC INVERSE SCATTERING PROBLEMS OF ANISOTROPIC CYLINDRICAL OBSTACLES SO WAVE MOTION LA English DT Article ID HARMONIC ACOUSTIC-WAVES; ALGORITHM AB The GPST, an efficient and versatile interative inversion algorithm, is used with a body-fitted irregular cylindrical grid system to solve electromagnetic inverse scattering problems of cylindrical obstacles with anisotropic permittivity. Numerical simulations of nontrivial examples are carried out to test the feasibility and to study the general characteristics of GPST inversion algorithm without the real measurement data. It is found that GPST does produce reasonably good results. C1 SUNY STONY BROOK,DEPT APPL MATH & STAT,STONY BROOK,NY 11794. RP BAUS, TA (reprint author), USN,CTR UNDERSEA WARFARE,NEW LONDON DETACHMENT,NEW LONDON,CT 06320, USA. NR 26 TC 0 Z9 0 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0165-2125 J9 WAVE MOTION JI Wave Motion PD OCT PY 1992 VL 16 IS 3 BP 193 EP 205 DI 10.1016/0165-2125(92)90028-Z PG 13 WC Acoustics; Mechanics; Physics, Multidisciplinary SC Acoustics; Mechanics; Physics GA JU216 UT WOS:A1992JU21600003 ER PT J AU RANDLES, PW AF RANDLES, PW TI SYNTHESIS OF EQUIVALENT DYNAMIC LAMINATE BEHAVIOR BY HOMOGENIZATION TECHNIQUES SO WAVE MOTION LA English DT Article AB New homogenization techniques are applied to the well-known case of a linearly elastic, periodic laminate for one-dimensional elastic wave propagation. An equivalent constitutive description is synthesized exactly for a finite bandwidth on wave-number centered at zero. The equivalent forms are convolution products in time and space of field variables with generalized modulus and density. The results are verified for spectral content and compared with experimental data and exact solutions for a two-point boundary value problem. RP RANDLES, PW (reprint author), USN,RES LAB,MECH MAT BRANCH,CODE 6380,WASHINGTON,DC 20375, USA. NR 16 TC 3 Z9 3 U1 0 U2 2 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0165-2125 J9 WAVE MOTION JI Wave Motion PD OCT PY 1992 VL 16 IS 3 BP 229 EP 247 DI 10.1016/0165-2125(92)90031-V PG 19 WC Acoustics; Mechanics; Physics, Multidisciplinary SC Acoustics; Mechanics; Physics GA JU216 UT WOS:A1992JU21600006 ER PT J AU KOLP, JG AF KOLP, JG TI THE DYNAMICS OF ELECTORAL COMPETITION IN PREREVOLUTIONARY VIRGINIA SO WILLIAM AND MARY QUARTERLY LA English DT Article RP KOLP, JG (reprint author), USN ACAD,ANNAPOLIS,MD 21402, USA. NR 41 TC 3 Z9 3 U1 0 U2 0 PU INST EARLY AMER HIST CULT PI WILLIAMSBURG PA BOX 220, WILLIAMSBURG, VA 23187 SN 0043-5597 J9 WILLIAM MARY QUART JI William Mary Q. PD OCT PY 1992 VL 49 IS 4 BP 652 EP 674 DI 10.2307/2947176 PG 23 WC History SC History GA JV178 UT WOS:A1992JV17800004 ER PT J AU APPLEBY, DF AF APPLEBY, DF TI HOLY RELIC AND HOLY IMAGE - SAINTS RELICS IN THE WESTERN CONTROVERSY OVER IMAGES IN THE 8TH-CENTURY AND 9TH-CENTURY SO WORD & IMAGE LA English DT Article RP APPLEBY, DF (reprint author), USN ACAD,ANNAPOLIS,MD 21402, USA. NR 51 TC 7 Z9 7 U1 0 U2 0 PU TAYLOR & FRANCIS LTD PI LONDON PA ONE GUNDPOWDER SQUARE, LONDON, ENGLAND EC4A 3DE SN 0266-6286 J9 WORD IMAGE JI Word Image PD OCT-DEC PY 1992 VL 8 IS 4 BP 333 EP 350 PG 18 WC Humanities, Multidisciplinary SC Arts & Humanities - Other Topics GA KG913 UT WOS:A1992KG91300003 ER PT J AU HONG, SY KERTESZ, M LEE, YS KIM, OK AF HONG, SY KERTESZ, M LEE, YS KIM, OK TI GEOMETRICAL AND ELECTRONIC-STRUCTURES OF A BENZIMIDAZOBENZOPHENANTHROLINE-TYPE LADDER POLYMER (BBL) SO MACROMOLECULES LA English DT Article ID ELECTRICAL-CONDUCTIVITY; OPTICAL-PROPERTIES; POLYACETYLENE; POLYPARAPHENYLENE; POLYTHIOPHENE; DERIVATIVES; POLYANILINE; RESONANCE; MNDO; GAP AB Variation of the geometrical and electronic structures of a benzimidazobenzophenanthroline-type ladder polymer (BBL) was theoretically investigated. The effect of charge transfer and protonation at the imine N sites revealed fundamental differences with respect to POL-type ladder polymers. Semiempirical (MNDO) solid-state theory was employed for geometry optimization, and the electronic structures were calculated from a modified extended Huckel energy band theory. Neutral BBL is predicted to have aromatic naphthalenic and benzenoid units and alternating bond lengths of imines in the ground state. This results in a band gap of 2 eV, in agreement with optical absorption experiments. The lowest empty band of the neutral form is flat. As charge transfer occurs, the naphthalenic unit becomes quinoid-like and the bond lengths around an imine N become almost equal to each other. The geometrical and electronic structures of neutral BBL are not much affected upon protonation, which induces creation of stable carbonium ions between two nitrogens along the N-imino amide units. Therefore, acid doping may increase the conductivity of BBL films not just through protonation but also through charge transfer. A symmetry of the effect of donor and acceptor doping is interpreted in terms of molecular orbital theory. The absence of a red shift in the absorption spectrum upon doping in BBL is different from most conducting polymers, and is interpreted as being a consequence of the robustness of the geometry and the flatness of the conduction band. C1 GEORGETOWN UNIV,DEPT CHEM,WASHINGTON,DC 20057. USN,RES LAB,DIV CHEM,WASHINGTON,DC 20375. RI Kertesz, Miklos/E-7122-2010 OI Kertesz, Miklos/0000-0002-7930-3260 NR 40 TC 29 Z9 29 U1 2 U2 13 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0024-9297 J9 MACROMOLECULES JI Macromolecules PD SEP 28 PY 1992 VL 25 IS 20 BP 5424 EP 5429 DI 10.1021/ma00046a046 PG 6 WC Polymer Science SC Polymer Science GA JQ519 UT WOS:A1992JQ51900046 ER PT J AU HARRIS, VG AYLESWORTH, KD DAS, BN ELAM, WT KOON, NC AF HARRIS, VG AYLESWORTH, KD DAS, BN ELAM, WT KOON, NC TI STRUCTURAL ORIGINS OF MAGNETIC-ANISOTROPY IN SPUTTERED AMORPHOUS TB-FE FILMS SO PHYSICAL REVIEW LETTERS LA English DT Article ID METALLIC FILMS; ALLOYS AB Using x-ray-absorption fine-structure measurements we have obtained clear evidence for structural anisotropy in amorphous sputter-deposited TbFe films exhibiting perpendicular magnetic anisotropy. Modeling of the data shows that perpendicular anisotropy in these films is associated with Fe-Fe and Tb-Tb pair correlations which are greater in plane and Tb-Fe correlations which are greater perpendicular to the film plane. Upon annealing at 300-degrees-C the measured structural anisotropy disappears and the magnetic anisotropy decreases to a level consistent with magnetoelastic interactions between the film and substrate. RP HARRIS, VG (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 12 TC 95 Z9 95 U1 0 U2 19 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 SEP 28 PY 1992 VL 69 IS 13 BP 1939 EP 1942 DI 10.1103/PhysRevLett.69.1939 PG 4 WC Physics, Multidisciplinary SC Physics GA JP859 UT WOS:A1992JP85900029 ER PT J AU IDZERDA, YU RAMAKER, DE AF IDZERDA, YU RAMAKER, DE TI STRUCTURAL CHARACTERIZATION BY LOW-ENERGY AUGER-ELECTRON AND PHOTOELECTRON SCATTERING SO PHYSICAL REVIEW LETTERS LA English DT Article ID SURFACE ATOMIC-STRUCTURE; X-RAY PHOTOELECTRON; ANGULAR-DISTRIBUTIONS; MULTIPLE-SCATTERING; HOLOGRAPHIC IMAGES; DIFFRACTION; SILHOUETTES; EMISSION; CRYSTALLOGRAPHY; SPECTROSCOPY AB The angle-resolved electron intensity patterns of low energy Auger electrons and photoelectrons are calculated using a quantum mechanical electron scattering formalism with the inclusion of appropriate electron angular momentum. Calculations indicate that scattering of high angular momentum and low energy electrons exhibit minima in the forward direction whereas low angular momenta or high energy electrons exhibit maxima, as is experimentally observed. Comparison of experimental and theoretical patterns allows for detailed structural characterizations. RP IDZERDA, YU (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 37 TC 40 Z9 40 U1 1 U2 4 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0031-9007 J9 PHYS REV LETT JI Phys. Rev. Lett. PD SEP 28 PY 1992 VL 69 IS 13 BP 1943 EP 1946 DI 10.1103/PhysRevLett.69.1943 PG 4 WC Physics, Multidisciplinary SC Physics GA JP859 UT WOS:A1992JP85900030 ER PT J AU DENNIS, ML DULING, IN AF DENNIS, ML DULING, IN TI HIGH REPETITION RATE FIGURE 8 LASER WITH EXTRACAVITY FEEDBACK SO ELECTRONICS LETTERS LA English DT Article DE LASERS; OPTICAL FIBERS ID DOPED FIBER LASER; SOLITON LASER; MIRROR AB The operation of an erbium figure eight all-fibre laser with a fundamental repetition rate of 28.5 MHz is reported. The feedback of light rejected by the nonlinear amplifying loop mirror back into the laser is found to stabilise mode locking, enhance startup, shorten the pulse length to 275 fs, and provide a simple means of multiplying the repetition rate. RP DENNIS, ML (reprint author), USN,RES LAB,OPT TECHNIQUES BRANCH,CODE 6572,WASHINGTON,DC 20357, USA. NR 13 TC 56 Z9 56 U1 1 U2 6 PU IEE-INST ELEC ENG PI HERTFORD PA MICHAEL FARADAY HOUSE SIX HILLS WAY STEVENAGE, HERTFORD, ENGLAND SG1 2AY SN 0013-5194 J9 ELECTRON LETT JI Electron. Lett. PD SEP 24 PY 1992 VL 28 IS 20 BP 1894 EP 1896 DI 10.1049/el:19921212 PG 3 WC Engineering, Electrical & Electronic SC Engineering GA JT461 UT WOS:A1992JT46100028 ER PT J AU ESMAN, RD MONSMA, MJ DEXTER, JL COOPER, DG AF ESMAN, RD MONSMA, MJ DEXTER, JL COOPER, DG TI MICROWAVE TRUE TIME-DELAY MODULATOR USING FIBEROPTIC DISPERSION SO ELECTRONICS LETTERS LA English DT Article DE OPTICAL DISPERSION; OPTICAL FIBERS AB A new method for providing a continuously variable, true time delay for radio frequency (RF), microwave, and millimetre wave signals using fibre optics is proposed and demonstrated. Variation in time delay up to 1.7ns and millisecond-order modulation speeds are demonstrated for signals to 20 GHz C1 JAYCOR,VIENNA,VA 22180. RP ESMAN, RD (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 4 TC 20 Z9 21 U1 1 U2 2 PU IEE-INST ELEC ENG PI HERTFORD PA MICHAEL FARADAY HOUSE SIX HILLS WAY STEVENAGE, HERTFORD, ENGLAND SG1 2AY SN 0013-5194 J9 ELECTRON LETT JI Electron. Lett. PD SEP 24 PY 1992 VL 28 IS 20 BP 1905 EP 1907 DI 10.1049/el:19921219 PG 3 WC Engineering, Electrical & Electronic SC Engineering GA JT461 UT WOS:A1992JT46100035 ER PT J AU MERMELSTEIN, MD VOHRA, ST AF MERMELSTEIN, MD VOHRA, ST TI LOW-FREQUENCY ELECTROSTRICTIVE CERAMIC PLATE VOLTAGE SENSOR SO ELECTRONICS LETTERS LA English DT Article DE PIEZOELECTRIC TRANSDUCERS; TRANSDUCERS AB A stress-driven electrostrictive ceramic is used for the first timw to demonstrate a DC and low frequency voltage sensor. The device uses a Ba:PZT ceramic plate as the sensor element and exhibits a sensitivity of 0.68 mV/V and a minimum detectable voltage of 1.4 mV/square-root (Hz) below 10 Hz. A susceptibility for the coupled polarisation and strain modes is developed and used to quantitatively characterise the sensor operation. Design parameters are suggested for improving the device performance by several orders of magnitude. RP MERMELSTEIN, MD (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 4 TC 1 Z9 1 U1 0 U2 1 PU IEE-INST ELEC ENG PI HERTFORD PA MICHAEL FARADAY HOUSE SIX HILLS WAY STEVENAGE, HERTFORD, ENGLAND SG1 2AY SN 0013-5194 J9 ELECTRON LETT JI Electron. Lett. PD SEP 24 PY 1992 VL 28 IS 20 BP 1930 EP 1932 DI 10.1049/el:19921235 PG 3 WC Engineering, Electrical & Electronic SC Engineering GA JT461 UT WOS:A1992JT46100051 ER PT J AU PROKES, SM CARLOS, WE BERMUDEZ, VM AF PROKES, SM CARLOS, WE BERMUDEZ, VM TI LUMINESCENCE CYCLING AND DEFECT DENSITY-MEASUREMENTS IN POROUS SILICON - EVIDENCE FOR HYDRIDE BASED MODEL SO APPLIED PHYSICS LETTERS LA English DT Article ID DECOMPOSITION; INTERFACE; SURFACES; FTIR AB Changes in dangling bond densities in porous silicon were measured and results indicate a relatively low dangling bond density (roughly 3 X 10(16) bonds/cm3) in as-prepared samples, which increases by a factor of 6-7 upon quenching of the photoluminescence (PL). The electron spin resonance (ESR) data suggest the presence of significant disorder in the as-prepared 1 OMEGA-cm porous silicon samples, which may correlate with an enhanced PL intensity. The results of heat cycling and HF dipping experiments suggest that a continuous decrease in particle size does not result in a continuous PL blue shift, as would be expected in the quantum confinement model. These results will be discussed in terms of a hydride/polysilane luminescence mechanism. RP PROKES, SM (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 20 TC 105 Z9 106 U1 2 U2 7 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 SEP 21 PY 1992 VL 61 IS 12 BP 1447 EP 1449 DI 10.1063/1.107565 PG 3 WC Physics, Applied SC Physics GA JN991 UT WOS:A1992JN99100027 ER PT J AU LYNCH, TC AF LYNCH, TC TI SHIP SHAPE SO NEW REPUBLIC LA English DT Letter C1 USN,ANNAPOLIS,MD 21402. NR 1 TC 0 Z9 0 U1 0 U2 0 PU NEW REPUBLIC INC PI WASHINGTON PA 1220 19TH ST NW SUITE 600, WASHINGTON, DC 20036 SN 0028-6583 J9 NEW REPUBLIC JI New Repub. PD SEP 21 PY 1992 VL 207 IS 13 BP 4 EP 5 PG 2 WC Political Science SC Government & Law GA JM886 UT WOS:A1992JM88600004 ER PT J AU BECKER, PA AF BECKER, PA TI 1ST-ORDER FERMI ACCELERATION IN SPHERICALLY SYMMETRICAL FLOWS - SOLUTIONS INCLUDING QUADRATIC LOSSES SO ASTROPHYSICAL JOURNAL LA English DT Article DE ACCELERATION OF PARTICLES, GALAXIES; COOLING FLOWS, METHODS; ANALYTICAL, PLASMAS, RADIO SOURCES; EXTENDED, RELATIVITY ID ENERGETIC PARTICLE-ACCELERATION; GALACTIC RADIO-SOURCES; CLUSTER COOLING FLOWS; COSMIC-RAY TRANSPORT; ACCRETION FLOWS; MAGNETIC-FIELDS; ABELL CLUSTERS; COMA CLUSTER; COLD MEDIA; GALAXIES AB We obtain a new, exact solution for the Green's function describing the transport of relativistic particles in steady, spherically symmetric background flows, including the effects of first-order Fermi acceleration, spatial diffusion, bulk advection, and losses proportional to the square of the particle momentum. The flow velocity of the background (scattering) plasma and the spatial diffusion coefficient are assumed to vary as upsilon(r) is-proportional-to r(-alpha) and kappa(p, r) is-proportional-to r(beta)K(p), respectively, where r is the radius and K(p) is an arbitrary function of the particle momentum p. The momentum loss rate is assumed to vary quadratically with the particle momentum as [p]loss = Ap2-upsilon/r, where A = constant. Examples of quadratic loss mechanisms include synchrotron and inverse Compton; in the synchrotron case, the implied magnetic field variation is B2 is-proportional-to upsilon/r, which may be satisfied in galaxy cluster cooling flows. Losses exactly balance first-order Fermi acceleration at the critical momentum p(c) = (2 - alpha)/(3A), which is a single constant for the entire flow if A = constant. Finite losses cause a compression of the dynamic range of the momentum variable relative to the lossless case (A = 0), since particles injected with momentum p0 are confined to the interval (p0, p(c)). The sign of upsilon is unrestricted, and therefore our model can be used to study the transport of relativistic particles in both winds and accretion flows. Previous studies of particle transport in radio sources have considered the effects of spatial diffusion and synchrotron losses on relativistic electrons propagating through static background plasmas. The inclusion of bulk motions of the plasma affects both the energization of the electrons (via Fermi acceleration) and the spatial transport (via advection). In accretion flows, advection tends to drag the electrons inward, reducing the number escaping from the flow, while Fermi acceleration tends to increase the energy of the electrons that do escape. We find that the spectrum of electrons at large radii (and hence the associated synchrotron emission) is significantly harder in the presence of bulk motions, and that extended, power-law radio spectra are a natural consequence of either monoenergetic or power-law electron injection. In particular, we conclude that Fermi acceleration may help to explain the production of core-halo radio emission in cooling flows. Therefore core halos may provide independent evidence for dynamical cooling processes in clusters of galaxies. It has been previously pointed out that the flux of relativistic particles emerging from an accretion flow vanishes for certain values of the parameters (alpha, beta, gamma) when K(p) is-proportional-to p(gamma). This region of the parameter space is consequently unobservable if the relativistic particles are photons. However, if the relativistic particles are electrons, we show that observable power-law radio emission can be produced even when the emergent flux of electrons vanishes. RP BECKER, PA (reprint author), USN,RES LAB,EO HULBURT CTR SPACE RES,CODE 412111,WASHINGTON,DC 20375, USA. NR 47 TC 16 Z9 16 U1 0 U2 0 PU UNIV CHICAGO PRESS PI CHICAGO PA 5720 S WOODLAWN AVE, CHICAGO, IL 60637 SN 0004-637X J9 ASTROPHYS J JI Astrophys. J. PD SEP 20 PY 1992 VL 397 IS 1 BP 88 EP 116 DI 10.1086/171769 PN 1 PG 29 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA JM989 UT WOS:A1992JM98900012 ER PT J AU ODENWALD, S FISCHER, J LOCKMAN, FJ STEMWEDEL, S AF ODENWALD, S FISCHER, J LOCKMAN, FJ STEMWEDEL, S TI THE UNUSUAL COMETARY STAR-FORMING REGION-G110-13 SO ASTROPHYSICAL JOURNAL LA English DT Article ID HIGH-LATITUDE CLOUDS; H-II REGIONS; MOLECULAR CLOUDS; SPECTRUM; NEBULA; DUST AB We present far-IR, radio continuum, and spectral line observations of an unusual, highly elongated, comet-shaped molecular cloud, located approximately 100 pc from the Galactic plane. The presence of three late B-type stars embedded within, or adjacent to, this low-mass (almost-equal-to 60 M.) cloud implies a star-forming efficiency that may be as high as 30%. Several mechanisms that may have been responsible for its unusual morphology and high star-forming efficiency will be described and evaluated. Although ram-pressure resulting from the rapid motion of this cloud through the interstellar medium could explain its streamlined appearance, there is evidence that G110 - 13 is the compression front formed by a recent cloud collision. C1 APPL RES CORP,LANDOVER,MD 20785. USN,RES LAB,CTR ADV SPACE SENSING,WASHINGTON,DC 20375. NATL RADIO ASTRON OBSERV,CHARLOTTESVILLE,VA 22903. RP ODENWALD, S (reprint author), BDM INT,SUITE 340,409 3RD ST SW,WASHINGTON,DC 20024, USA. NR 40 TC 18 Z9 18 U1 0 U2 0 PU UNIV CHICAGO PRESS PI CHICAGO PA 5720 S WOODLAWN AVE, CHICAGO, IL 60637 SN 0004-637X J9 ASTROPHYS J JI Astrophys. J. PD SEP 20 PY 1992 VL 397 IS 1 BP 174 EP 186 DI 10.1086/171777 PN 1 PG 13 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA JM989 UT WOS:A1992JM98900020 ER PT J AU RAMAKER, DE TURNER, NH MILLIKEN, J AF RAMAKER, DE TURNER, NH MILLIKEN, J TI THE NATURE OF CORE EXCITED-STATES IN C-60 AS EXHIBITED BY THE AUGER LINE-SHAPE SO JOURNAL OF PHYSICAL CHEMISTRY LA English DT Article ID NARROW-BAND METALS; ELECTRON-SPECTROSCOPY; RESONANT EXCITATION; SHAKE PROCESSES; SPECTRA; C60; IDENTIFICATION; CASCADES; GRAPHITE; DENSITY AB We have measured the C KVV Auger line shape for C60 and compared it with that previously obtained for graphite and benzene. A theoretical interpretation reveals the presence of two shakeup satellites. One satellite results from shakeup upon creation of the initial core hole, the second, upon filling of the core hole in the Auger final state. The relative intensity and energy shift of the first satellite indicate that the 1s-1-pi-1-pi* shakeup state is localized on the core excited atom. In contrast, for graphite, only a fraction of the 1s-1-pi-1-pi* excitations (i.e. only the low energy electron-hole pairs excited at the Fermi level) remained sufficiently localized to contribute to the fine shape. The absence of Auger satellites in both C60 and graphite from either the resonant 1s-1-pi* or the shakeup 1s-1v-1 excitation indicates that these excitations delocalize in times that are short relative to core hole decay. C1 USN,RES LAB,DIV CHEM,WASHINGTON,DC 20375. GEORGE WASHINGTON UNIV,DEPT CHEM,WASHINGTON,DC 20052. NR 41 TC 7 Z9 7 U1 1 U2 3 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0022-3654 J9 J PHYS CHEM-US JI J. Phys. Chem. PD SEP 17 PY 1992 VL 96 IS 19 BP 7627 EP 7632 DI 10.1021/j100198a026 PG 6 WC Chemistry, Physical SC Chemistry GA JN952 UT WOS:A1992JN95200026 ER PT J AU GILARDI, R GEORGE, C FLIPPENANDERSON, JL AF GILARDI, R GEORGE, C FLIPPENANDERSON, JL TI STRUCTURE OF 3-NITRATO-1-NITROAZETIDINE SO ACTA CRYSTALLOGRAPHICA SECTION C-CRYSTAL STRUCTURE COMMUNICATIONS LA English DT Note AB C3H5N3O5, M(r) = 163. 1, tetragonal, P4(1), a = 10.646 (1), c = 5.752 (2) angstrom, V = 651.9 (2) angstrom3, Z = 4, D(x) = 1.662 Mg m-3, lambda(Mo Kalpha) = 0.71073 angstrom, mu = 0.15 mm-1, F(000) = 336, T = 200 K, final R = 0.031, wR = 0.030 for 415 independent observed reflections. The four-membered ring is significantly puckered, with an angle between the C-C-C and C-N-C planes of 12.7-degrees. The amino atom N1 is pyramidal as seen by the 'out-of-plane-bend' angle between the N-N bond and the C-N-C plane, which is 39.5-degrees. The nitro group itself shows no twist relative to the azetidine ring (average value of the four torsion angles about the N1-N1a bond is 0.5-degrees). RP GILARDI, R (reprint author), USN,RES LAB,STRUCT MATTER LAB,WASHINGTON,DC 20375, USA. NR 4 TC 1 Z9 1 U1 0 U2 0 PU MUNKSGAARD INT PUBL LTD PI COPENHAGEN PA 35 NORRE SOGADE, PO BOX 2148, DK-1016 COPENHAGEN, DENMARK SN 0108-2701 J9 ACTA CRYSTALLOGR C JI Acta Crystallogr. Sect. C-Cryst. Struct. Commun. PD SEP 15 PY 1992 VL 48 BP 1679 EP 1680 DI 10.1107/S0108270192000696 PN 9 PG 2 WC Chemistry, Multidisciplinary; Crystallography SC Chemistry; Crystallography GA JQ049 UT WOS:A1992JQ04900046 ER PT J AU GILARDI, R GEORGE, C FLIPPENANDERSON, JL AF GILARDI, R GEORGE, C FLIPPENANDERSON, JL TI STRUCTURE OF 1,1,3,3-TETRANITROCYCLOBUTANE SO ACTA CRYSTALLOGRAPHICA SECTION C-CRYSTAL STRUCTURE COMMUNICATIONS LA English DT Note ID DERIVATIVES AB C4H4N4O8, M(r) = 236.1, triclinic, P1BAR, a = 6.301 (1), b = 7.858 (1), c = 8.736 (1) angstrom, alpha = 85.88 (1), beta = 84.62 (1), gamma = 85.13 (1)-degrees, V = 428.2 (1) angstrom3, Z = 2 (two half molecules per asymmetric unit), D(x) = 1.831 Mg m-3, lambda(Cu Kalpha) = 1.54184 angstrom, mu = 1.56 mm-1, F(000) = 240, T = 295 K, final R = 0.031, wR = 0.039 for 575 independent observed reflections. The cyclobutane rings are exactly planar (each one sits on a separate crystallographic inversion center) with the gem-dinitro substituents disposed symmetrically above and below the ring plane. The planes of the two nitro groups bonded to the same C atom are perpendicular to one another (dihedral angles of 89.3 and 88.4-degrees for the two independent molecules). RP GILARDI, R (reprint author), USN,RES LAB,STRUCT MATTER LAB,WASHINGTON,DC 20375, USA. NR 4 TC 8 Z9 8 U1 1 U2 1 PU MUNKSGAARD INT PUBL LTD PI COPENHAGEN PA 35 NORRE SOGADE, PO BOX 2148, DK-1016 COPENHAGEN, DENMARK SN 0108-2701 J9 ACTA CRYSTALLOGR C JI Acta Crystallogr. Sect. C-Cryst. Struct. Commun. PD SEP 15 PY 1992 VL 48 BP 1680 EP 1681 DI 10.1107/S0108270192000702 PN 9 PG 2 WC Chemistry, Multidisciplinary; Crystallography SC Chemistry; Crystallography GA JQ049 UT WOS:A1992JQ04900047 ER PT J AU GEORGE, C GILARDI, R FLIPPENANDERSON, JL AF GEORGE, C GILARDI, R FLIPPENANDERSON, JL TI STRUCTURE OF AN ACETONE SOLVATE OF 7,9-DIACETYL-2,5-DINITRO-2,5,7,9-TETRAAZABICYCLO[4.3.0]NONANE SO ACTA CRYSTALLOGRAPHICA SECTION C-CRYSTAL STRUCTURE COMMUNICATIONS LA English DT Note AB C9H14N6O6.1/2C3H6O, M(r) = 331.29, monoclinic, C2/c, a = 29.512 (5), b = 9.142 (1), e = 10.872 (2) angstrom, beta = 92.46 (1)-degrees, V = 2930.5 (8) angstrom3, Z = 8, D(x) = 1.502 Mg m-3, lambda(Cu Kalpha) = 1.54184 angstrom, mu = 1.04 mm-1, F(000) = 1392, T = 295 K, final R = 0.043, wR = 0.047 for 1708 independent observed reflections. Torsions and bends have destroyed the symmetry of this symmetrically substituted heterocycle. The torsion angles of the six-membered ring indicate a very distorted boat conformation, with the two N atoms at the bow and stern positions of the boat. The nitro-substituted N atoms are substantially pyramidalized, with bend angles between the N-N bonds and the adjacent CNC planes of 17.3 and 38.5-degrees. The atoms of the five-membered ring fit a flattened envelope conformation, with an N atom lying 0.19 angstrom from the (+/- 0.01 angstrom) plane of the other four atoms. The two acetyl-substituted N atoms are essentially flat, with out-of-plane bends < 10-degrees. RP GEORGE, C (reprint author), USN,RES LAB,STRUCT MATTER LAB,WASHINGTON,DC 20375, USA. NR 2 TC 0 Z9 0 U1 0 U2 0 PU MUNKSGAARD INT PUBL LTD PI COPENHAGEN PA 35 NORRE SOGADE, PO BOX 2148, DK-1016 COPENHAGEN, DENMARK SN 0108-2701 J9 ACTA CRYSTALLOGR C JI Acta Crystallogr. Sect. C-Cryst. Struct. Commun. PD SEP 15 PY 1992 VL 48 BP 1699 EP 1701 DI 10.1107/S0108270192000933 PN 9 PG 3 WC Chemistry, Multidisciplinary; Crystallography SC Chemistry; Crystallography GA JQ049 UT WOS:A1992JQ04900058 ER PT J AU MACINTYRE, EA SMIT, L RITZ, J KIRSCH, IR STROMINGER, JL AF MACINTYRE, EA SMIT, L RITZ, J KIRSCH, IR STROMINGER, JL TI DISRUPTION OF THE SCL LOCUS IN T-LYMPHOID MALIGNANCIES CORRELATES WITH COMMITMENT TO THE T-CELL RECEPTOR-ALPHA-BETA LINEAGE SO BLOOD LA English DT Article ID ACUTE LYMPHOBLASTIC-LEUKEMIA; SITE-SPECIFIC RECOMBINATION; LOOP-HELIX PROTEINS; TRANSCRIPTIONAL ENHANCER; GAMMA-DELTA; CHROMOSOMAL TRANSLOCATION; DNA-BINDING; TAL-1 GENE; CHAIN GENE; C-ALPHA C1 USN,MED ONCOL BRANCH,NCI,BETHESDA,MD 20814. HARVARD UNIV,DEPT BIOCHEM & MOLEC BIOL,CAMBRIDGE,MA 02138. HARVARD UNIV,SCH MED,DANA FARBER CANC INST,BOSTON,MA 02115. RI Ritz, Jerome/C-7929-2009 OI Ritz, Jerome/0000-0001-5526-4669 FU NCI NIH HHS [CA47554] NR 51 TC 58 Z9 59 U1 0 U2 2 PU W B SAUNDERS CO PI PHILADELPHIA PA INDEPENDENCE SQUARE WEST CURTIS CENTER, STE 300, PHILADELPHIA, PA 19106-3399 SN 0006-4971 J9 BLOOD JI Blood PD SEP 15 PY 1992 VL 80 IS 6 BP 1511 EP 1520 PG 10 WC Hematology SC Hematology GA JN507 UT WOS:A1992JN50700019 PM 1387813 ER PT J AU IMTHURN, GP GARCIA, GA WALKER, HW FORBES, L AF IMTHURN, GP GARCIA, GA WALKER, HW FORBES, L TI BONDED SILICON-ON-SAPPHIRE WAFERS AND DEVICES SO JOURNAL OF APPLIED PHYSICS LA English DT Note AB Silicon-on-sapphire (SOS) has been prepared by direct wafer bonding. The silicon layer was thinned to about 10-mu-m by mechanical grinding and chemical etching. P-N junction diodes were fabricated in the bonded SOS and compared with epitaxially grown SOS. The reverse bias leakage current was almost 15 X less in the bonded SOS. A generation lifetime of 10-mu-s can be estimated from the junction leakage. The effects of processing temperatures on the bonded SOS were also studied. C1 SCI & TECHNOL CORP,HAMPTON,VA 23666. OREGON STATE UNIV,CORVALLIS,OR 97331. RP IMTHURN, GP (reprint author), USN COMMAND,CTR CONTROL & OCEAN SURVEILLANCE,DIV RDT&E NRAD,SAN DIEGO,CA 92152, USA. NR 6 TC 21 Z9 21 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 SEP 15 PY 1992 VL 72 IS 6 BP 2526 EP 2527 DI 10.1063/1.352345 PG 2 WC Physics, Applied SC Physics GA JN512 UT WOS:A1992JN51200065 ER PT J AU WEISS, WR BERZOFSKY, JA HOUGHTEN, RA SEDEGAH, M HOLLINDALE, M HOFFMAN, SL AF WEISS, WR BERZOFSKY, JA HOUGHTEN, RA SEDEGAH, M HOLLINDALE, M HOFFMAN, SL TI A T-CELL CLONE DIRECTED AT THE CIRCUMSPOROZOITE PROTEIN WHICH PROTECTS MICE AGAINST BOTH PLASMODIUM-YOELII AND PLASMODIUM-BERGHEI SO JOURNAL OF IMMUNOLOGY LA English DT Article ID MALARIA SPOROZOITES; GAMMA-INTERFERON; FALCIPARUM; ANTIBODY; EPITOPES; DETERMINANT; INHIBITION; RECOGNIZE; MOLECULE; RECEPTOR AB Clone B is a cytotoxic T cell clone induced by immunization with Plasmodium yoelii sporozoites which recognizes an epitope on both the P. yoelii and Plasmodium berghei circumsporozoite proteins. It is CD8, uses the V-beta 8.1 TCR, and is K(d) restricted. When adoptively transferred, it protects mice against infection by both species of malaria sporozoites, and this protection is dependent on IFN-gamma. Clone B cells are more broadly reactive and protective than previously described murine T cell clones against malaria. Clone B may be an important model for immune protection against the spectrum of variant parasites in nature. C1 PAN AM HLTH ORG,WASHINGTON,DC 20037. BIOMED RES INST,ROCKVILLE,MD 20852. USN,MED RES INST,MALARIA PROGRAM,BETHESDA,MD 20899. NCI,METAB BRANCH,MOLEC IMMUNOGENET & VACCINE RES SECT,BETHESDA,MD 20814. TORREY PINES INST MOLEC STUDIES,SAN DIEGO,CA 92121. NR 28 TC 97 Z9 97 U1 0 U2 3 PU AMER ASSOC IMMUNOLOGISTS PI BETHESDA PA 9650 ROCKVILLE PIKE, BETHESDA, MD 20814 SN 0022-1767 J9 J IMMUNOL JI J. Immunol. PD SEP 15 PY 1992 VL 149 IS 6 BP 2103 EP 2109 PG 7 WC Immunology SC Immunology GA JN121 UT WOS:A1992JN12100038 PM 1517574 ER PT J AU YANG, XY SEIDERMAN, W ATHALE, RA ASTOR, M CAVIRIS, NP AF YANG, XY SEIDERMAN, W ATHALE, RA ASTOR, M CAVIRIS, NP TI OPTICAL IMPLEMENTATION OF WINNER-TAKE-ALL NEURAL NETWORK USING ELECTRON TRAPPING MATERIALS SO OPTICS COMMUNICATIONS LA English DT Article AB We present an optical winner-take-all (WTA) neural network based on novel electron trapping (ET) materials. The mathematical model is modified for the optical implementation. All the neuron operations required by the WTA network such as self-excitation, lateral inhibition and thresholding, are performed by a single ET device. C1 GEORGE MASON UNIV,DEPT ELECT & COMP ENGN,FAIRFAX,VA 22030. USN,CTR SURFACE WARFARE,SILVER SPRING,MD 20903. RP YANG, XY (reprint author), QUANTEX CORP,2 RES COURT,ROCKVILLE,MD 20850, USA. NR 14 TC 7 Z9 14 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0030-4018 J9 OPT COMMUN JI Opt. Commun. PD SEP 15 PY 1992 VL 93 IS 1-2 BP 33 EP 38 DI 10.1016/0030-4018(92)90124-A PG 6 WC Optics SC Optics GA JM417 UT WOS:A1992JM41700007 ER PT J AU DREWS, AR OSOFSKY, MS HOFF, HA PENG, JL LI, ZY GREENE, RL VANDERAH, TA AF DREWS, AR OSOFSKY, MS HOFF, HA PENG, JL LI, ZY GREENE, RL VANDERAH, TA TI PHASE SEGREGATION OF CERIUM IN ND2-XCEXCUO4-Y SO PHYSICA C-SUPERCONDUCTIVITY AND ITS APPLICATIONS LA English DT Article ID HIGH-TEMPERATURE SUPERCONDUCTORS; CRYSTAL-GROWTH; SINGLE-CRYSTALS; COLOR AB We report phase segregation based on cerium content in thick (> 70-mu-m) single crystals and a polycrystalline sample of Nd2-xCexCuO4-y with nominal composition x = 0.15. The crystals showed segregation into sharply defined sheets of material with different cerium concentrations. These sheets in the a-b-plane of the crystals were apparent when polished cross-sections were viewed with crossed polarizers in visible light. The different color of each layer was correlated with cerium compositions by electron microprobe analysis. AC susceptibility showed a strong, well defined transition at 24.5 K and a second, weaker transition at 20 K. The appearance of the 20 K transition was shown to be associated with a layer of material with reduced cerium content. A polycrystalline sample also displayed small intra-grain regions with reduced cerium content. C1 UNIV MARYLAND, CTR SUPERCOND RES, DEPT PHYS & ASTRON, COLL PK, MD 20742 USA. NAWCWPNS, DEPT RES, DIV CHEM, CHINA LAKE, CA 93555 USA. RP DREWS, AR (reprint author), USN, RES LAB, MAT PHYS BRACH, WASHINGTON, DC 20375 USA. RI Osofsky, Michael/A-1050-2010 NR 24 TC 21 Z9 21 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 SEP 15 PY 1992 VL 200 IS 1-2 BP 122 EP 128 DI 10.1016/0921-4534(92)90328-A PG 7 WC Physics, Applied SC Physics GA JP087 UT WOS:A1992JP08700014 ER PT J AU ALBANO, AM PASSAMANTE, A HEDIGER, T FARRELL, ME AF ALBANO, AM PASSAMANTE, A HEDIGER, T FARRELL, ME TI USING NEURAL NETS TO LOOK FOR CHAOS SO PHYSICA D LA English DT Article ID SIGNALS AB Backpropapting neural networks are used to reconstruct the attractors of two low-dimensional chaotic systems using small input sets of noise-corrupted data. The nets are able to reconstruct attractors that are visually similar to, and have the same correlation dimensions as, attractors constructed from noise-free data. C1 USN,AIR WARFARE CTR,WARMINSTER,PA 18974. RP ALBANO, AM (reprint author), BRYN MAWR COLL,DEPT PHYS,BRYN MAWR,PA 19010, USA. NR 21 TC 33 Z9 34 U1 0 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0167-2789 J9 PHYSICA D JI Physica D PD SEP 15 PY 1992 VL 58 IS 1-4 BP 1 EP 9 DI 10.1016/0167-2789(92)90098-8 PG 9 WC Mathematics, Applied; Physics, Multidisciplinary; Physics, Mathematical SC Mathematics; Physics GA JV858 UT WOS:A1992JV85800002 ER PT J AU CAWLEY, R HSU, GH AF CAWLEY, R HSU, GH TI LOCAL-GEOMETRIC-PROJECTION METHOD FOR NOISE-REDUCTION IN CHAOTIC MAPS AND FLOWS SO PHYSICAL REVIEW A LA English DT Article ID TIME-SERIES; SYSTEMS AB We describe a method for noise reduction in chaotic systems that is based on projection of the set of points comprising an embedded noisy orbit in R(d) toward a finite patchwork of best-fit local approximations to an m-dimensional surface M' subset-of R(d), m less-than-or-equal-to d. We generate the orbits by the delay coordinate construction of Ruelle and Takens [N. H. Packard et al., Phys. Rev. Lett. 45, 712 (1980); F. Takens, in Dynamical Systems and Turbulence, Warwick, 1980, edited by D. A. Rand and L.-S. Young (Springer, Berlin, 1981)] from time series upsilon (t), which in an experimental situation we would assume to have come, together with additional high-dimensional background noise, from an underlying dynamical system f(t): M --> M existing on some low m-dimensional manifold M. The surface M' in R(d) is the assumed embedded image of M. We give results of systematic studies of linear (tangent plane) projection schemes. We describe in detail the basic algorithm for implementing these schemes. We apply the algorithm iteratively to known map and flow time series to which white noise has been added. In controlled studies, we measure the signal-to-noise ratio improvements, iterating nm times until a stable maximum delta(M) is achieved. We present extensive results for delta(M) and n(M) for a wide range of values of embedding trial dimension d, projection dimension k, number of nearest-neighbor points for local approximation nu, embedding delay DELTA, sampling interval DELTAT, initial noise amplitude N, and trajectory length N. We give results for very low and very high noise amplitudes 0% less-than-or-equal-to N less-than-or-equal-to 100%. We develop an empirical method for estimating the initial noise level for a given experimental time series, and for the optimal choice of algorithm parameters to achieve peak reduction. We present interesting results of application of the noise-reduction algorithm to a chaotic time series produced from a periodically driven magnetoelastic ribbon experiment on the control of chaos. Two noteworthy elements of the noise-reduction method we describe result in certain stabilizing and efficiency features. The first is our use of a physical replacement time series, which is a unique scalar time series with the property that its corresponding delay coordinate construction data state vector time series in R(d) is optimally close to the noise-reduced replacement vector time series generated by the projection. The second is the introduction of a "measure-ordered" cover, which produces notable improvement in reliability, control, and computational efficiency of the whole algorithm. C1 UNIV MISSOURI,DEPT MATH,COLUMBIA,MO 65211. RP CAWLEY, R (reprint author), USN,CTR SURFACE WARFARE,MATH & INFORMAT SCI BRANCH,DALHGREN DIV,SILVER SPRING,MD 20903, USA. NR 25 TC 110 Z9 122 U1 0 U2 4 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 SEP 15 PY 1992 VL 46 IS 6 BP 3057 EP 3082 DI 10.1103/PhysRevA.46.3057 PG 26 WC Optics; Physics, Atomic, Molecular & Chemical SC Optics; Physics GA JQ375 UT WOS:A1992JQ37500018 ER PT J AU OVERFELT, PL AF OVERFELT, PL TI SCALAR OPTICAL BEAMS WITH HELICAL SYMMETRY SO PHYSICAL REVIEW A LA English DT Article ID DIFFRACTION-FREE BEAMS; GAUSSIAN BEAMS; BESSEL-GAUSS; APERTURE AB Using a nonorthogonal helical coordinate system, we obtain exact free-space solutions for both the Helmholtz and paraxial Helmholtz equations. At optical frequencies the helical Helmholtz solutions can be interpreted as helical beams characterized by a constant pitch angle and beam radius. These solutions are shown to be generalizations of the family of scalar nondiffracting beams known as Bessel beams. They are similar to Bessel beams in some ways, such as an invariant intensity distribution profile in any plane normal to their axis of propagation, but have a nonconstant order. The paraxial helical Helmholtz equation is cast into two different forms, one assuming propagation along the helical axis and one assuming propagation along the original cylindrical axis. The first is solved using a paraxial form of the above helical beam family while a solution of the second form is a helical Gaussian. RP OVERFELT, PL (reprint author), USN,CTR AIR WARFARE,DIV WEAP,RES DEPT,DIV PHYS,CHINA LAKE,CA 93555, USA. NR 19 TC 13 Z9 13 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 SEP 15 PY 1992 VL 46 IS 6 BP 3516 EP 3522 DI 10.1103/PhysRevA.46.3516 PG 7 WC Optics; Physics, Atomic, Molecular & Chemical SC Optics; Physics GA JQ375 UT WOS:A1992JQ37500062 ER PT J AU PERDEW, JP CHEVARY, JA VOSKO, SH JACKSON, KA PEDERSON, MR SINGH, DJ FIOLHAIS, C AF PERDEW, JP CHEVARY, JA VOSKO, SH JACKSON, KA PEDERSON, MR SINGH, DJ FIOLHAIS, C TI ATOMS, MOLECULES, SOLIDS, AND SURFACES - APPLICATIONS OF THE GENERALIZED GRADIENT APPROXIMATION FOR EXCHANGE AND CORRELATION SO PHYSICAL REVIEW B LA English DT Review ID DENSITY-FUNCTIONAL THEORY; INHOMOGENEOUS ELECTRON-GAS; BOND-ENERGY CALCULATIONS; WAVE-VECTOR ANALYSIS; HARTREE-FOCK; KINETIC-ENERGY; DERIVATIVE DISCONTINUITIES; SCREENING FUNCTION; METALLIC SURFACES; CHARGE-DENSITIES AB Generalized gradient approximations (GGA's) seek to improve upon the accuracy of the local-spin-density (LSD) approximation in electronic-structure calculations. Perdew and Wang have developed a GGA based on real-space cutoff of the spurious long-range components of the second-order gradient expansion for the exchange-correlation hole. We have found that this density functional performs well in numerical tests for a variety of systems: (1) Total energies of 30 atoms are highly accurate. (2) Ionization energies and electron affinities are improved in a statistical sense, although significant interconfigurational and interterm errors remain. (3) Accurate atomization energies are found for seven hydrocarbon molecules, with a rms error per bond of 0.1 eV, compared with 0.7 eV for the LSD approximation and 2.4 eV for the Hartree-Fock approximation. (4) For atoms and molecules, there is a cancellation of error between density functionals for exchange and correlation, which is most striking whenever the Hartree-Fock result is furthest from experiment. (5) The surprising LSD underestimation of the lattice constants of Li and Na by 3-4 % is corrected, and the magnetic ground state of solid Fe is restored. (6) The work function, surface energy (neglecting the long-range contribution), and curvature energy of a metallic surface are all slightly reduced in comparison with LSD. Taking account of the positive long-range contribution, we find surface and curvature energies in good agreement with experimental or exact values. Finally, a way is found to visualize and understand the nonlocality of exchange and correlation, its origins, and its physical effects. C1 TULANE UNIV, QUANTUM THEORY GRP, NEW ORLEANS, LA 70118 USA. UNIV TORONTO, DEPT PHYS, TORONTO M5S 1A7, ONTARIO, CANADA. USN, RES LAB, COMPLEX SYST THEORY BRANCH, WASHINGTON, DC 20375 USA. UNIV COIMBRA, DEPT PHYS, P-3000 COIMBRA, PORTUGAL. RP TULANE UNIV, DEPT PHYS, NEW ORLEANS, LA 70118 USA. RI Singh, David/I-2416-2012; OI Fiolhais, Carlos/0000-0002-1527-0738; Jackson, Koblar/0000-0002-5342-7978 NR 121 TC 13502 Z9 13709 U1 103 U2 862 PU AMER PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1098-0121 EI 1550-235X J9 PHYS REV B JI Phys. Rev. B PD SEP 15 PY 1992 VL 46 IS 11 BP 6671 EP 6687 DI 10.1103/PhysRevB.46.6671 PG 17 WC Physics, Condensed Matter SC Physics GA JN826 UT WOS:A1992JN82600002 ER PT J AU MOORE, WJ HENRY, RL SABAN, SB BLAKEMORE, JS AF MOORE, WJ HENRY, RL SABAN, SB BLAKEMORE, JS TI EL2-COPPER INTERACTION IN HEAT-TREATED GAAS SO PHYSICAL REVIEW B LA English DT Note ID SEMI-INSULATING GAAS; GALLIUM-ARSENIDE; ACCEPTORS; CRYSTALS; CENTERS; CARBON; CU AB Heating semi-insulating GaAs in the presence of copper produces conversion to p type with the low-temperature Fermi level located on carbon at 26 meV above the valence band. As the EL2 concentration is much larger than the shallow-donor concentration in these samples, this decompensation by Cu could not occur unless copper interacts with EL2 to render the EL2 electrically inactive. Copper complexing with EL2 or copper replacement of the As(Ga) component of EL2 are possible mechanisms. The data are consistent, within the expected error, with complete passivation of all the EL2. It is proposed that the most likely mechanism is Cu complexing with EL2 to form electrically inactive As(Ga)-Cu(Ga). next-nearest-neighbor double-donor-double-acceptor complexes. C1 WESTERN WASHINGTON STATE UNIV,BELLINGHAM,WA 98225. RP MOORE, WJ (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 19 TC 9 Z9 9 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD SEP 15 PY 1992 VL 46 IS 11 BP 7229 EP 7231 DI 10.1103/PhysRevB.46.7229 PG 3 WC Physics, Condensed Matter SC Physics GA JN826 UT WOS:A1992JN82600074 ER PT J AU TURKA, LA FLETCHER, MC CRAIGHEAD, N THOMPSON, CB JUNE, CH AF TURKA, LA FLETCHER, MC CRAIGHEAD, N THOMPSON, CB JUNE, CH TI DEFECTIVE SIGNAL TRANSDUCTION BY THE CD2 MOLECULE IN IMMATURE T-CELL RECEPTOR CD3- THYMOCYTES SO PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA LA English DT Article ID THYMIC EPITHELIAL-CELLS; TYROSINE PHOSPHORYLATION; INTERLEUKIN-2 RECEPTOR; MATURE THYMOCYTES; ANTIGEN RECEPTOR; EXPRESSION; ACTIVATION; BINDING; STIMULATION; SELECTION AB The CD2 accessory molecule mediates an activation pathway in mature T cells, transducing signals similar to those observed following stimulation of the T-cell receptor/CD3 (TCR/CD3) complex. CD2 is also one of the earliest cell surface markers to appear during thymic ontogeny and has been proposed to be a stimulatory pathway for immature thymocytes that have not yet expressed TCRs on their surface (TCR/CD3-). To examine this hypothesis highly purified TCR/CD3- human thymocytes were stimulated using mitogenic combinations of anti-CD2 monoclonal antibodies or individual biotinylated anti-CD2 monoclonal antibodies crosslinked with avidin. TCR/CD3+ thymocytes responded readily to either stimulus as determined by anti-phosphotyrosine immunoblotting, and the pattern of tyrosine phosphorylated substrates was similar to that of mature T cells. In contrast, TCR/CD3- thymocytes responded weakly and with a distinct substrate pattern. In addition, the altered signal transduced by CD2 in TCR/CD3- thymocytes did not lead to a rise in intracellular calcium, failed to induce interleukin 2 receptor expression, and did not serve as a comitogen with phorbol ester or interleukin 2, functions that were all intact in TCR/CD3+ thymocytes. Failure of TCR/CD3- thymocytes to respond to CD2 stimulation was not due to an intrinsic defect in these cells as they responded normally to phorbol ester plus calcium ionophore. In TCR/CD3- thymocytes, CD2 stimulation also failed to affect steady-state mRNA levels of the recombination-activating genes RAG1 and RAG2, whereas in TCR/CD3+ cells activation of the CD2 pathway terminated their expression. Together, these data support the concept that CD2 engagement does not deliver a stimulus to TCR/CD3- thymocytes and suggests that this molecule may not directly participate in the earliest stages of thymic development. C1 UNIV MICHIGAN,HOWARD HUGHES MED INST,ANN ARBOR,MI 48109. UNIV MICHIGAN,DEPT MICROBIOL IMMUNOL,ANN ARBOR,MI 48109. USN,MED RES INST,IMMUNE CELL BIOL PROGRAM,BETHESDA,MD 20889. RP TURKA, LA (reprint author), UNIV MICHIGAN,DEPT MED,ANN ARBOR,MI 48109, USA. NR 33 TC 13 Z9 14 U1 0 U2 0 PU NATL ACAD PRESS PI WASHINGTON PA 2101 CONSTITUTION AVE NW, WASHINGTON, DC 20418 SN 0027-8424 J9 P NATL ACAD SCI USA JI Proc. Natl. Acad. Sci. U. S. A. PD SEP 15 PY 1992 VL 89 IS 18 BP 8706 EP 8710 DI 10.1073/pnas.89.18.8706 PG 5 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA JN503 UT WOS:A1992JN50300061 PM 1382296 ER PT J AU JUNG, WY VOGT, PR AF JUNG, WY VOGT, PR TI PREDICTING BATHYMETRY FROM GEOSAT-ERM AND SHIP-BORNE PROFILES IN THE SOUTH-ATLANTIC OCEAN SO TECTONOPHYSICS LA English DT Article ID SEASAT ALTIMETER DATA; EMPEROR SEAMOUNT CHAIN; WORLDS OCEANS; PACIFIC-OCEAN; WALVIS RIDGE; ISOSTASY; GRAVITY; COMPENSATION; EVOLUTION; REGION AB Portions of two Geosat-ERM altimeter tracks and corresponding suborbital shipboard gravity and bathymetry profiles in the South Atlantic Ocean were analyzed: one across the Walvis Ridge (about 1100 km long) and the other in the Brazil Basin (about 2300 km long). Together, these profiles sample those types of sea-floor topography which dominate the gravity signature at wavelengths of 20 to 300 km. The Walvis Ridge is a massive aseismic ridge and the Brazil Basin profile crosses both an old seamount (emplaced at the time the crust was young) and a very young mid-plate volcano. Both profiles cross fracture zones. After the gravity and bathymetry profiles were split into subprofiles, various cross-spectral characteristics could be determined by FFT techniques. Analysis showed that observed admittance is not well constrained by either an Airy-type or flexural compensation models across the Walvis Ridge, but those over the Brazil Basin can be readily explained by an Airy-type model with a mean crustal thickness of about 20 km. A theoretical filter was then designed, based on a priori geological knowledge, and used to predict bathymetry from the high-passed gravity/geoid anomalies. Not surprisingly, the predicted bathymetry shows more detailed and correct short-wavelength (20-300 km) features than those predicted from the historical data base, as represented e.g., by the DBDB5 gridded bathymetric model. For areas where historical shipboard bathymetry measurements are widely spaced (longer than about 10 km for single-beam data) but where some regional geologic information is available (such as the relative ages of mid-plate volcanoes and crust), bathymetry predicted from altimetric data can be used to upgrade regional bathymetric data bases, on which regional geologic/geophysical understanding depends. RP JUNG, WY (reprint author), USN,RES LAB,CODE 5110,WASHINGTON,DC 20375, USA. NR 44 TC 27 Z9 27 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0040-1951 J9 TECTONOPHYSICS JI Tectonophysics PD SEP 15 PY 1992 VL 210 IS 3-4 BP 235 EP 253 DI 10.1016/0040-1951(92)90324-Y PG 19 WC Geochemistry & Geophysics SC Geochemistry & Geophysics GA JP010 UT WOS:A1992JP01000004 ER PT J AU MAKOUS, JL LAREAU, RT HUES, SM AF MAKOUS, JL LAREAU, RT HUES, SM TI OXYGEN INCORPORATION IN MO/NI MULTILAYERS SO THIN SOLID FILMS LA English DT Article ID SUPER-LATTICES; SUPERLATTICES; ANOMALIES; WAVES AB We describe the effects of oxygen incorporation on the structural and elastic properties of Mo/Ni multilayers. Auger depth profiling analyses of the multilayers show that the oxygen level in the nickel layers saturates at 7 at.% while that in the molybdenum layers steadily increases as the average oxygen incorporation in the multilayers is increased to 20 at.%. X-ray diffraction measurements indicate that a structural transition from coherent superlattices to incoherent multilayers occurs at an average bilayer oxygen concentration of about 10-12 at.%. At oxygen concentrations above this level the structural analyses of the individual molybdenum and nickel layers indicate a continuous breakdown in the ordering of the molybdenum layers concurrent with an improvement in the structural order in the nickel. Surface acoustic wave velocity measurements demonstrate an elastic hardening with increasing oxygen incorporation that is consistent with the observed relaxation in the nickel layers and with previous work on the elastic properties of Mo/Ni multilayers. C1 USA,ETDL,SLCET,EJ,FT MONMOUTH,NJ 07703. RP MAKOUS, JL (reprint author), USN,RES LAB,DIV CHEM,WASHINGTON,DC 20375, USA. NR 27 TC 1 Z9 1 U1 0 U2 0 PU ELSEVIER SCIENCE SA LAUSANNE PI LAUSANNE 1 PA PO BOX 564, 1001 LAUSANNE 1, SWITZERLAND SN 0040-6090 J9 THIN SOLID FILMS JI Thin Solid Films PD SEP 15 PY 1992 VL 216 IS 2 BP 259 EP 267 DI 10.1016/0040-6090(92)90847-5 PG 9 WC Materials Science, Multidisciplinary; Materials Science, Coatings & Films; Physics, Applied; Physics, Condensed Matter SC Materials Science; Physics GA JP379 UT WOS:A1992JP37900011 ER PT J AU HAYWARD, IP SINGER, IL SEITZMAN, LE AF HAYWARD, IP SINGER, IL SEITZMAN, LE TI EFFECT OF ROUGHNESS ON THE FRICTION OF DIAMOND ON CVD DIAMOND COATINGS SO WEAR LA English DT Article ID CHEMICAL VAPOR-DEPOSITION; TRIBOLOGICAL PROPERTIES; RAMAN-SPECTROSCOPY; FILMS; SILICON AB Reciprocating sliding tests in air have been performed on polycrystalline diamond coatings with a range of surface roughnesses. Both the coatings and the single crystal diamonds used as sliders were abrasively worn during the tests. This wear reduced the roughnesses of the coatings, and was most severe at the beginning of the tests. The friction coefficient decreased as the coating surface was smoothed. Friction coefficients depended on both the roughness of the coating and the stylus: values ranged from 0.5 for rough styluses on rough coatings (R(a) > 200 nm), to 0.03 for smooth styluses on smooth coatings (R(a) almost-equal-to 1 nm), the latter being comparable to the lowest value obtained with polished single crystal diamond. The higher initial friction coefficients could be eliminated by mechanical or chemical polishing. Roughness parameters relevant to loaded elastic solids are discussed, and related to a model for the dependence of friction on the angle of interlocking asperities. Wear behaviour and estimates of wear rates indicate that the wear resistance of the coatings is comparable to that of natural, single-crystal diamond, despite the polycrystalline nature of the coatings. C1 USN,RES LAB,WASHINGTON,DC 20375. RP HAYWARD, IP (reprint author), GEOCENTERS INC,10903 INDIAN HEAD HIGHWAY,FT WASHINGTON,MD 20744, USA. NR 25 TC 114 Z9 115 U1 1 U2 26 PU ELSEVIER SCIENCE SA LAUSANNE PI LAUSANNE 1 PA PO BOX 564, 1001 LAUSANNE 1, SWITZERLAND SN 0043-1648 J9 WEAR JI Wear PD SEP 15 PY 1992 VL 157 IS 2 BP 215 EP 227 DI 10.1016/0043-1648(92)90063-E PG 13 WC Engineering, Mechanical; Materials Science, Multidisciplinary SC Engineering; Materials Science GA JQ221 UT WOS:A1992JQ22100002 ER PT J AU XIA, W YU, LS GUAN, ZF PAPPERT, SA YU, PKL LAU, SS SCHWARZ, SA PUDENZI, MAA FLOREZ, LT HARBISON, JP AF XIA, W YU, LS GUAN, ZF PAPPERT, SA YU, PKL LAU, SS SCHWARZ, SA PUDENZI, MAA FLOREZ, LT HARBISON, JP TI PLANAR, LOW-LOSS OPTICAL WAVE-GUIDES FABRICATED BY SOLID-PHASE REGROWTH SO APPLIED PHYSICS LETTERS LA English DT Article ID GAAS AB Planar, low-loss AlGaAs/GaAs waveguides have been fabricated using the solid-phase regrowth (SPR) process. Single-mode waveguide with a propagation loss as low as 1.6 dB/cm have been obtained. This process requires only thin-film deposition and low-temperature short-duration annealing (i.e., 650-degrees-C for 30 s), thus making the SPR method a much simplified technique to induce compositional disordering. Simultaneous electrical isolation and compositional disordering are also demonstrated with the SPR process. C1 BELLCORE, RED BANK, NJ 07701 USA. USN, CTR OCEAN SYST, SAN DIEGO, CA 92132 USA. RP XIA, W (reprint author), UNIV CALIF SAN DIEGO, DEPT ELECT & COMP ENGN, LA JOLLA, CA 92093 USA. NR 4 TC 7 Z9 7 U1 0 U2 0 PU AMER INST PHYSICS PI MELVILLE PA CIRCULATION & FULFILLMENT DIV, 2 HUNTINGTON QUADRANGLE, STE 1 N O 1, MELVILLE, NY 11747-4501 USA SN 0003-6951 J9 APPL PHYS LETT JI Appl. Phys. Lett. PD SEP 14 PY 1992 VL 61 IS 11 BP 1269 EP 1271 DI 10.1063/1.107614 PG 3 WC Physics, Applied SC Physics GA JM687 UT WOS:A1992JM68700005 ER PT J AU LINDSAY, GA HENRY, RA HOOVER, JM KNOESEN, A MORTAZAVI, MA AF LINDSAY, GA HENRY, RA HOOVER, JM KNOESEN, A MORTAZAVI, MA TI SUB-T(G) RELAXATION BEHAVIOR OF CORONA-POLED NONLINEAR OPTICAL POLYMER-FILMS AND VIEWS ON PHYSICAL AGING SO MACROMOLECULES LA English DT Article ID 2ND HARMONIC-GENERATION; CHEMICAL CROSS-LINKING; POLY(METHYL METHACRYLATE); 2ND-HARMONIC GENERATION; AMORPHOUS POLYMERS; GLASS-TRANSITION; ELECTRIC-FIELD; RANGE ORDER; TEMPERATURES; ORIENTATION AB The complete synthesis and characterization of a poly(methyl methacrylate-co-coumaromethacrylate) is described. Thin films of this polymer were corona-poled and aged under various conditions. The intensity of second harmonic light, generated by passing a laser beam through the polarized films, indicated the average degree of dipole alignment in the films as a function of time and temperature. The long-term aging data were fit with biexponential and stretched exponential equations. A model based on diffusion of defects (holes) in a locally heterogeneous glassy matrix is discussed. C1 UNIV CALIF DAVIS, DEPT ELECT ENGN & COMP SCI, DAVIS, CA 95616 USA. HOECHST CELANESE CORP, ADV TECHNOL GRP, SUMMIT, NJ 07901 USA. RP LINDSAY, GA (reprint author), USN, CTR AIR WARFARE, DIV WEAP, RES DEPT, DIV CHEM, CHINA LAKE, CA 93555 USA. NR 78 TC 65 Z9 66 U1 1 U2 1 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0024-9297 J9 MACROMOLECULES JI Macromolecules PD SEP 14 PY 1992 VL 25 IS 19 BP 4888 EP 4894 DI 10.1021/ma00045a010 PG 7 WC Polymer Science SC Polymer Science GA JP275 UT WOS:A1992JP27500010 ER PT J AU MCGRATH, KJ NGAI, KL ROLAND, CM AF MCGRATH, KJ NGAI, KL ROLAND, CM TI TEMPERATURE-DEPENDENCE OF SEGMENTAL MOTION IN POLYISOBUTYLENE AND POLY(VINYLETHYLENE) SO MACROMOLECULES LA English DT Article ID NUCLEAR-MAGNETIC-RESONANCE; SOLID-STATE; CONFORMATIONAL TRANSITIONS; MOLECULAR-MOTION; ROTATING SOLIDS; CHAIN DYNAMICS; C-13 NMR; RELAXATION; POLYMERS; POLYISOPRENE AB Solid-state C-13 NMR measurements carried out on poly(vinylethylene) (PVE) and polyisobutylene (PIB) demonstrate that the molecular motions underlying their respective segmental relaxations have vastly different temperature dependencies. These differences parallel the contrasting mechanical behavior exhibited by the two polymers in the vicinity of their glass transition temperature. It is suggested that greater temperature sensitivity reflects a more intermolecularly cooperative relaxation. C1 USN,RES LAB,WASHINGTON,DC 20375. NR 29 TC 27 Z9 27 U1 1 U2 6 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0024-9297 J9 MACROMOLECULES JI Macromolecules PD SEP 14 PY 1992 VL 25 IS 19 BP 4911 EP 4914 DI 10.1021/ma00045a014 PG 4 WC Polymer Science SC Polymer Science GA JP275 UT WOS:A1992JP27500014 ER PT J AU NGAI, KL SCHONHALS, A SCHLOSSER, E AF NGAI, KL SCHONHALS, A SCHLOSSER, E TI AN EXPLANATION OF ANOMALOUS DIELECTRIC-RELAXATION PROPERTIES OF POLY(PROPYLENE GLYCOL) SO MACROMOLECULES LA English DT Article ID DYNAMIC LIGHT-SCATTERING; MOLECULAR-DYNAMICS; CIS-POLYISOPRENE; CHAIN DYNAMICS; POLYMER-CHAIN; TEMPERATURE; SPECTROSCOPY; ENTANGLEMENT; DEPENDENCES AB Dielectric measurements on low molecular weight poly(propylene glycol) over a wide frequency window of about 10 decades show that the relaxation times of the segmental relaxation and the normal modes have different temperature dependences. The segmental relaxation time, tau(s)*, has a much stronger temperature dependence than that of the normal-mode relaxation time, tau-2*. As temperature is decreased, the shorter tau(s)* increases much faster than tau-2*, with a tendency of tau(s)* to encroach tau-2* resulting in a reduction of the dielectric strength of the normal mode. These dielectric results are analogous to that shown in viscoelastic data obtained in low molecular weight polystyrene by Plazek and explained previously by the coupling model. The dielectric data are explained quantitatively here also by the coupling model. Moreover, the molecular weight dependence of the normal-mode relaxation time at constant temperature is found experimentally to be significantly stronger than that expected from Rouse dynamics. It is a consequence of couplings between chains caused by hydrogen bonding of the OH end groups in poly(propylene glycol) and is explained here in the framework of the coupling model. C1 CENTRUM MAKROMOLEK CHEM,O-1199 BERLIN,GERMANY. RP NGAI, KL (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. RI Schoenhals, Andreas/E-4194-2010 NR 33 TC 83 Z9 83 U1 1 U2 7 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0024-9297 J9 MACROMOLECULES JI Macromolecules PD SEP 14 PY 1992 VL 25 IS 19 BP 4915 EP 4919 DI 10.1021/ma00045a015 PG 5 WC Polymer Science SC Polymer Science GA JP275 UT WOS:A1992JP27500015 ER PT J AU PLAZEK, DJ ZHENG, XD NGAI, KL AF PLAZEK, DJ ZHENG, XD NGAI, KL TI VISCOELASTIC PROPERTIES OF AMORPHOUS POLYMERS .1. DIFFERENT TEMPERATURE DEPENDENCES OF SEGMENTAL RELAXATION AND TERMINAL DISPERSION SO MACROMOLECULES LA English DT Article ID DYNAMIC LIGHT-SCATTERING; CONCENTRATION FLUCTUATIONS; MOLECULAR-DYNAMICS; ALPHA-RELAXATION; BEHAVIOR; SYSTEMS; TIME; POLYPROPYLENE; POLYSTYRENE; DENSITY AB Two drastically different temperature dependences of the segmental relaxation and terminal dispersion previously observed in entangled polystyrene, poly(vinylacetate), and polypropylene were explained before in the framework of the coupling model as due to the large difference between the segmental motion coupling parameter, n(alpha), and the entanglement coupling parameter, n(eta), in these polymers, with n(alpha) being significantly larger. The n(alpha) for a polyisobutylene was found recently to be the smallest among amorphous polymers, and its value is comparable to that of n(eta). As a consequence the coupling model requires that the temperature dependences for segmental relaxation (near the glassy level) and the terminal dispersion be similar. Viscoelastic measurements were carried out in a high molecular weight (entangled) polyisobutylene sample to verify this clear prediction. The experimental results presented here have borne out the theoretical expectations. C1 USN,RES LAB,WASHINGTON,DC 20375. UNIV PITTSBURGH,DEPT MAT SCI & ENGN,PITTSBURGH,PA 15261. NR 33 TC 98 Z9 98 U1 2 U2 13 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0024-9297 J9 MACROMOLECULES JI Macromolecules PD SEP 14 PY 1992 VL 25 IS 19 BP 4920 EP 4924 DI 10.1021/ma00045a016 PG 5 WC Polymer Science SC Polymer Science GA JP275 UT WOS:A1992JP27500016 ER PT J AU MARRONE, MJ KERSEY, AD VILLARRUEL, CA KIRKENDALL, CK DANDRIDGE, A AF MARRONE, MJ KERSEY, AD VILLARRUEL, CA KIRKENDALL, CK DANDRIDGE, A TI ELIMINATION OF COHERENT RAYLEIGH BACKSCATTER INDUCED NOISE IN FIBER MICHELSON INTERFEROMETERS SO ELECTRONICS LETTERS LA English DT Article DE OPTICAL FIBERS; INTERFEROMETERS; SCATTERING AB A technique for the elimination of coherent Rayleigh backscatter effects in fibre optic Michelson interferometers is demonstrated. This technique allows interferometers to be addressed over a significant length of fibre lead, without Rayleigh backscatter induced excess noise limitations. RP MARRONE, MJ (reprint author), USN,RES LAB,DIV OPT SCI,CODE 6574,WASHINGTON,DC 20375, USA. NR 5 TC 26 Z9 29 U1 3 U2 3 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 SEP 10 PY 1992 VL 28 IS 19 BP 1803 EP 1804 DI 10.1049/el:19921149 PG 2 WC Engineering, Electrical & Electronic SC Engineering GA JN733 UT WOS:A1992JN73300019 ER PT J AU WILLIAMS, GM PUTNAM, MA ASKINS, CG GINGERICH, ME FRIEBELE, EJ AF WILLIAMS, GM PUTNAM, MA ASKINS, CG GINGERICH, ME FRIEBELE, EJ TI RADIATION EFFECTS IN ERBIUM-DOPED OPTICAL FIBERS SO ELECTRONICS LETTERS LA English DT Article DE OPTICAL FIBERS; RADIATION EFFECTS AB The radiation-induced absorption in erbium-doped optical fibres (EDFs) has been found to be strongly dependent on the fibre core composition. Implications for erbium-doped fibre amplifier (EDFA) performance have been modelled, and compositional variations which may increase their radiation hardness have been tentatively identified. C1 VIRGINIA POLYTECH INST & STATE UNIV,DEPT ELECT ENGN,BLACKSBURG,VA 24061. RP WILLIAMS, GM (reprint author), USN,RES LAB,DIV OPT SCI,CODE 6505,WASHINGTON,DC 20375, USA. RI shao, chongyun/M-6620-2013 NR 6 TC 33 Z9 33 U1 0 U2 3 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 SEP 10 PY 1992 VL 28 IS 19 BP 1816 EP 1818 DI 10.1049/el:19921158 PG 3 WC Engineering, Electrical & Electronic SC Engineering GA JN733 UT WOS:A1992JN73300028 ER PT J AU JACKSON, MK FRANKEL, MY WHITAKER, JF MOUROU, GA HULIN, D ANTONETTI, A VANHOVE, M DERAEDT, W CROZAT, P HAFDALLAH, H AF JACKSON, MK FRANKEL, MY WHITAKER, JF MOUROU, GA HULIN, D ANTONETTI, A VANHOVE, M DERAEDT, W CROZAT, P HAFDALLAH, H TI PICOSECOND LARGE-SIGNAL SWITCHING CHARACTERISTICS OF A PSEUDOMORPHIC ALGAAS/INGAAS MODULATED DOPED FIELD-EFFECT TRANSISTOR SO APPLIED PHYSICS LETTERS LA English DT Article ID ELECTROOPTIC SAMPLING SYSTEM; TRANSMISSION-LINES; PULSE GENERATION; DISPERSION AB We present the first comprehensive study of the large-signal switching characteristics of an AlGaAs/InGaAs modulation-doped field-effect transistor on a picosecond time scale. Electro-optic sampling is used to measure drain voltage response to a steplike gate input with a 2.8 ps rise time, at various dc biases. A large-signal switching time of 6.2 ps is obtained. Features deleterious to high-frequency device operation are observed, related to equivalent circuit parameters, and reduced by appropriate choice of operating point. C1 ECOLE POLYTECH,ENSTA,CTR YVETTE,OPT APPL LAB,F-91120 PALAISEAU,FRANCE. USN,RES LAB,WASHINGTON,DC 20375. UNIV MICHIGAN,CTR ULTRAFAST OPT SCI,ANN ARBOR,MI 48109. INTERUNIV MICROELECTR CTR,B-3001 LOUVAIN,BELGIUM. UNIV PARIS 11,INST ELECTR FONDAMENTALE,F-91405 ORSAY,FRANCE. RI Crozat, Paul/N-7094-2014 OI Crozat, Paul/0000-0002-4308-676X NR 20 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 SEP 7 PY 1992 VL 61 IS 10 BP 1187 EP 1189 DI 10.1063/1.107642 PG 3 WC Physics, Applied SC Physics GA JM341 UT WOS:A1992JM34100016 ER PT J AU WEAVER, BD SUMMERS, GP AF WEAVER, BD SUMMERS, GP TI ORDER-OF-MAGNITUDE METHOD FOR ESTIMATING THE FLUENCE THAT OPTIMIZES THE CRITICAL CURRENT IN PARTICLE-IRRADIATED CUPRATE SUPERCONDUCTORS SO APPLIED PHYSICS LETTERS LA English DT Article ID CRITICAL CURRENT-DENSITY; FAST-NEUTRON IRRADIATION; CRITICAL-CURRENT ENHANCEMENT; ION IRRADIATION; THIN-FILMS; YBA2CU3O7-DELTA; BA2YCU3O7-DELTA; TEMPERATURE; ELECTRON AB The particle fluence that maximizes the critical current enhancement in cuprate superconductors is shown to be closely related to the nonionizing energy loss (displacement damage) of a given particle. In many cases, only the incident particle type and energy need to be known in order to allow an order-of-magnitude prediction of the optimal fluence for enhancing the critical current. C1 UNIV MARYLAND,DEPT PHYS,CATONSVILLE,MD 21228. RP WEAVER, BD (reprint author), USN,RES LAB,CODE 4615,WASHINGTON,DC 20375, USA. NR 24 TC 6 Z9 6 U1 0 U2 0 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0003-6951 J9 APPL PHYS LETT JI Appl. Phys. Lett. PD SEP 7 PY 1992 VL 61 IS 10 BP 1237 EP 1239 DI 10.1063/1.107606 PG 3 WC Physics, Applied SC Physics GA JM341 UT WOS:A1992JM34100033 ER PT J AU DIDONATO, AR MORRIS, AH AF DIDONATO, AR MORRIS, AH TI ALGORITHM-708 - SIGNIFICANT DIGIT COMPUTATION OF THE INCOMPLETE BETA-FUNCTION RATIOS SO ACM TRANSACTIONS ON MATHEMATICAL SOFTWARE LA English DT Article DE CONTINUED FRACTIONS; F-DISTRIBUTION; MINIMAX APPROXIMATIONS AB An algorithm is given for evaluating the incomplete beta function ratio I(x)(a, b) and its complement 1 - I(x)(a, b). A new continued fraction and a new asymptotic series are used with classical results. A transportable Fortran subroutine based on this algorithm is currently in use. It is accurate to 14 significant digits when precision is not restricted by inherent error. C1 USN,CTR SURFACE WARFARE,DAHLGREN,VA 22448. NR 11 TC 11 Z9 11 U1 0 U2 1 PU ASSOC COMPUTING MACHINERY PI NEW YORK PA 1515 BROADWAY, NEW YORK, NY 10036 SN 0098-3500 J9 ACM T MATH SOFTWARE JI ACM Trans. Math. Softw. PD SEP PY 1992 VL 18 IS 3 BP 360 EP 373 DI 10.1145/131766.131776 PG 14 WC Computer Science, Software Engineering; Mathematics, Applied SC Computer Science; Mathematics GA LQ869 UT WOS:A1992LQ86900010 ER PT J AU GLAZEBROOK, KD WHITAKER, LR AF GLAZEBROOK, KD WHITAKER, LR TI SINGLE-MACHINE STOCHASTIC SCHEDULING WITH DEPENDENT PROCESSING TIMES SO ADVANCES IN APPLIED PROBABILITY LA English DT Article DE ASSOCIATED RANDOM VARIABLES; MARKOV DECISION PROCESS; OPTIMAL POLICY; STOCHASTIC SCHEDULING ID JOBS AB A single machine is available to process a collection of stochastic jobs preemptively. Rewards are received at job completions. We seek policies for machine allocation which maximize the total reward. Application areas point to the need to study such models for resource allocation when job processing requirements are dependent. To this end, models are developed in which the nature of such dependence is derived from various notions of positive and negative dependence in common usage in reliability. Optimal policies for resource allocation of simple structure are obtained for a variety of such models. C1 USN,POSTGRAD SCH,DEPT OPERAT RES,MONTEREY,CA 93943. RP GLAZEBROOK, KD (reprint author), UNIV NEWCASTLE UPON TYNE,DEPT MATH & STAT,NEWCASTLE TYNE NE1 7RU,TYNE & WEAR,ENGLAND. NR 22 TC 5 Z9 5 U1 0 U2 1 PU APPLIED PROBABILITY TRUST PI SHEFFIELD PA THE UNIVERSITY DEPT PROB AND STATISTICS, SHEFFIELD, ENGLAND S3 7RH SN 0001-8678 J9 ADV APPL PROBAB JI Adv. Appl. Probab. PD SEP PY 1992 VL 24 IS 3 BP 635 EP 652 DI 10.2307/1427483 PG 18 WC Statistics & Probability SC Mathematics GA JN711 UT WOS:A1992JN71100007 ER PT J AU RILEY, EC AMUNDSON, DE AF RILEY, EC AMUNDSON, DE TI LARYNGEAL TUBERCULOSIS REVISITED SO AMERICAN FAMILY PHYSICIAN LA English DT Article AB Although a rare entity, laryngeal tuberculosis must be a diagnostic consideration-along with laryngeal carcinoma-whenever patients present with prolonged hoarseness or painful dysphagia. This form of tuberculosis was once thought to be especially virulent and more infectious than other forms; however, severity was probably the result of the frequent association with advanced cavitary disease. Laryngeal tuberculosis usually responds well to multiple-drug antituberculous therapy. RP RILEY, EC (reprint author), USN HOSP,SAN DIEGO,CA 92134, USA. NR 0 TC 14 Z9 15 U1 0 U2 0 PU AMER ACAD FAMILY PHYSICIANS PI KANSAS CITY PA 8880 WARD PARKWAY, KANSAS CITY, MO 64114-2797 SN 0002-838X J9 AM FAM PHYSICIAN JI Am. Fam. Physician PD SEP PY 1992 VL 46 IS 3 BP 759 EP 762 PG 4 WC Primary Health Care; Medicine, General & Internal SC General & Internal Medicine GA JM856 UT WOS:A1992JM85600013 PM 1514470 ER PT J AU KOELLER, KK DILLON, WP AF KOELLER, KK DILLON, WP TI DYSEMBRYOPLASTIC NEUROEPITHELIAL TUMORS - MR APPEARANCE SO AMERICAN JOURNAL OF NEURORADIOLOGY LA English DT Article DE BRAIN NEOPLASMS, MAGNETIC RESONANCE; BRAIN NEOPLASMS, COMPUTED TOMOGRAPHY; SEIZURES ID TEMPORAL-LOBE EPILEPSY; PARTIAL SEIZURES; GANGLIOGLIOMA; LOBECTOMY; CHILDREN; CT AB PURPOSE: Dysembryoplastic neuroepithelial tumor (DNT) is a newly described, pathologically benign tumor arising within the supratentorial cortex and having a 100% association with partial complex seizures. We reviewed the MR appearance of the brains of six patients with DNT, without and with administration of gadolinium-DTPA, emphasizing the clinical and radiologic features. METHODS: The MR images in six patients (five male, one female) with pathologically proved DNT were reviewed. Five had partial complex seizures and one had partial simple seizures. Age at onset of partial seizures ranged from 2 to 19 years. Scans were obtained with conventional T1 and T2 weighting without and with the administration of gadolinium-DTPA. All patients had craniotomies for medically refractory seizures and pathologic examination of all specimens was available for review. RESULTS: MR demonstrated a focal cortical mass in all patients. Five were located in the temporal lobe and one was located within the occipital lobe. Two showed enhancement with gadolinium-DTPA. Calcification occurred in one lesion. Common features included very low signal intensity on T1-weighted images and high signal on T2-weighted images, similar to cerebrospinal fluid. Proton density images demonstrated slightly higher signal intensity in the lesion than cerebrospinal fluid. The margin of the tumor is well-circumscribed and may remodel the adjacent calvarium. CONCLUSIONS: DNT, a newly described pathologic entity resulting in chronic, often medically, intractable seizures, has characteristic features on MR that allow it to be suggested in the differential diagnosis. These lesions may simulate benign cysts; however, increased signal intensity on proton density images should prompt further investigation in the proper clinical setting. Differentiation from low-grade astrocytomas and ganglioglioma is not possible by MR. C1 UNIV CALIF SAN FRANCISCO,DEPT RADIOL,NEURORADIOL SECT,ROOM L-371,SAN FRANCISCO,CA 94143. USN HOSP,DEPT NAVY,OAKLAND,CA. NR 17 TC 91 Z9 93 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 SEP-OCT PY 1992 VL 13 IS 5 BP 1319 EP 1325 PG 7 WC Clinical Neurology; Neuroimaging; Radiology, Nuclear Medicine & Medical Imaging SC Neurosciences & Neurology; Radiology, Nuclear Medicine & Medical Imaging GA JN798 UT WOS:A1992JN79800008 PM 1414821 ER PT J AU PARKER, GS TAMI, TA AF PARKER, GS TAMI, TA TI THE MANAGEMENT OF PERITONSILLAR ABSCESS IN THE 90S - AN UPDATE SO AMERICAN JOURNAL OF OTOLARYNGOLOGY LA English DT Article RP PARKER, GS (reprint author), USN HOSP,DEPT OTOLARYNGOL HEAD & NECK SURG,PORTSMOUTH,VA, USA. NR 0 TC 10 Z9 10 U1 0 U2 0 PU W B SAUNDERS CO PI PHILADELPHIA PA INDEPENDENCE SQUARE WEST CURTIS CENTER, STE 300, PHILADELPHIA, PA 19106-3399 SN 0196-0709 J9 AM J OTOLARYNG JI Am. J. Otolaryngol. PD SEP-OCT PY 1992 VL 13 IS 5 BP 284 EP 288 PG 5 WC Otorhinolaryngology SC Otorhinolaryngology GA JN131 UT WOS:A1992JN13100005 PM 1285560 ER PT J AU OGERT, RA BROWN, JE SINGH, BR SHRIVERLAKE, LC LIGLER, FS AF OGERT, RA BROWN, JE SINGH, BR SHRIVERLAKE, LC LIGLER, FS TI DETECTION OF CLOSTRIDIUM-BOTULINUM TOXIN-A USING A FIBER OPTIC-BASED BIOSENSOR SO ANALYTICAL BIOCHEMISTRY LA English DT Article ID ANTIBODY-BASED IMMUNOASSAY; TETANUS C1 UNIV MASSACHUSETTS,DEPT CHEM,DARTMOUTH,MA 02747. USA,MED RES INST INFECT DIS,DEPT PATHOL,FREDERICK,MD 21701. RP OGERT, RA (reprint author), USN,RES LAB,CTR BIOMOLEC SCI & ENGN,WASHINGTON,DC 20375, USA. NR 23 TC 112 Z9 116 U1 0 U2 9 PU ACADEMIC PRESS INC JNL-COMP SUBSCRIPTIONS PI SAN DIEGO PA 525 B ST, STE 1900, SAN DIEGO, CA 92101-4495 SN 0003-2697 J9 ANAL BIOCHEM JI Anal. Biochem. PD SEP PY 1992 VL 205 IS 2 BP 306 EP 312 DI 10.1016/0003-2697(92)90440-I PG 7 WC Biochemical Research Methods; Biochemistry & Molecular Biology; Chemistry, Analytical SC Biochemistry & Molecular Biology; Chemistry GA JM682 UT WOS:A1992JM68200019 PM 1443578 ER PT J AU WALLACE, MR BOWLER, WA MURRAY, NB BRODINE, SK OLDFIELD, EC AF WALLACE, MR BOWLER, WA MURRAY, NB BRODINE, SK OLDFIELD, EC TI TREATMENT OF ADULT VARICELLA WITH ORAL ACYCLOVIR - A RANDOMIZED, PLACEBO-CONTROLLED TRIAL SO ANNALS OF INTERNAL MEDICINE LA English DT Article DE CEREBROVASCULAR DISORDERS; HEPARINOID; ENOXAPARIN; HEPARIN; THROMBOEMBOLISM ID ZOSTER VIRUS-INFECTION; IMMUNOCOMPROMISED PATIENTS; HEALTHY-ADULTS; CHILDREN; COMPLICATIONS; CHICKENPOX; PNEUMONIA; RESISTANT; THERAPY; POPULATION AB Objective: To assess the efficacy of oral acyclovir in treating adults with varicella and to describe the natural history of adult varicella. Design: Double-blind, placebo-controlled randomized trial. Setting: A naval hospital. Patients: One hundred forty-eight of 206 consecutive adult active duty Navy and Marine Corps personnel who were hospitalized for isolation and inpatient therapy of varicella and who could be treated within 72 hours of rash onset completed the study. The diagnosis of varicella was confirmed by acute and convalescent serology in 143 of 144 patients with available paired sera. Intervention: Patients were randomly assigned to receive either acyclovir, 800 mg orally five times per day for 7 days, or an identical placebo. Separate randomization codes were used for patients presenting within 24 hours of rash onset and for those presenting 25 to 72 hours after rash onset. Measurements: Daily lesion counts, symptom scores, temperature measurements, and laboratory tests were used to monitor the course of the illness. Results: Early treatment (initiated within 24 hours of rash onset) reduced the total time to (100%) crusting from 7.4 to 5.6 days (P = 0.001) and reduced the maximum number of lesions by 46% (P = 0.04). Duration of fever and severity of symptoms were also reduced by early therapy. Late therapy (25 to 72 hours after rash onset) had no effect on the course of illness. Only four patients had pneumonia, and no encephalitis or mortality was noted. Conclusions: Early therapy with oral acyclovir decreases the time to cutaneous healing of adult varicella, decreases the duration of fever, and lessens symptoms. Initiation of therapy after the first day of illness is of no value in uncomplicated cases of adult varicella. The low frequency of serious complications of varicella (pneumonia, encephalitis, or death) precluded any evaluation of the possible effect of acyclovir on these outcomes. C1 USN HOSP,DEPT INTERNAL MED,DIV INFECT DIS,SAN DIEGO,CA 92134. RP WALLACE, MR (reprint author), USN HOSP,DEPT CLIN INVEST,SAN DIEGO,CA 92134, USA. NR 30 TC 119 Z9 121 U1 0 U2 0 PU AMER COLL PHYSICIANS PI PHILADELPHIA PA INDEPENDENCE MALL WEST 6TH AND RACE ST, PHILADELPHIA, PA 19106-1572 SN 0003-4819 J9 ANN INTERN MED JI Ann. Intern. Med. PD SEP 1 PY 1992 VL 117 IS 5 BP 358 EP 363 PG 6 WC Medicine, General & Internal SC General & Internal Medicine GA JK678 UT WOS:A1992JK67800002 PM 1323943 ER PT J AU GOLDMAN, G WELBOURN, R ROTHLEIN, R WILES, M KOBZIK, L VALERI, CR SHEPRO, D HECHTMAN, HB MULDER, DS PRUITT, BA HENDRON, DN HARKEN, AH NAJI, A AF GOLDMAN, G WELBOURN, R ROTHLEIN, R WILES, M KOBZIK, L VALERI, CR SHEPRO, D HECHTMAN, HB MULDER, DS PRUITT, BA HENDRON, DN HARKEN, AH NAJI, A TI ADHERENT NEUTROPHILS MEDIATE PERMEABILITY AFTER ATELECTASIS SO ANNALS OF SURGERY LA English DT Article; Proceedings Paper CT 112TH ANNUAL MEETING OF THE AMERICAN SURGICAL ASSOC CY APR 06-08, 1992 CL PALM DESERT, CA SP AMER SURG ASSOC ID INTERCELLULAR-ADHESION MOLECULE-1; RESPIRATORY-DISTRESS SYNDROME; REEXPANSION PULMONARY-EDEMA; LIMB ISCHEMIA; TRANSENDOTHELIAL MIGRATION; LEUKOCYTE ADHESION; SURFACE EXPRESSION; SKELETAL-MUSCLE; INJURY; REPERFUSION AB Re-expansion of atelectatic lung is associated with increased permeability. This study tests whether neutrophils mediate this event. Right middle lobar atelectasis was induced in anesthetized rabbits (n = 18) by intraluminal obstruction of the bronchus after a 20-minute ventilation with 100% O2. After 1 hour of bronchial obstruction and 20 minutes after lobar re-expansion, leukopenia was noted, 2870 +/- 210 white blood cells (WBC)/mm3, relative to control animals treated with a noninflated balloon catheter, 6500 +/- 410 WBC/mm3 (p < 0.05). Three hours after re-expansion, neutrophils were sequestered in the previously atelectatic region 78 +/- 7 polymorphonuclear leukocytes (PMN)/10 high-power field (HPF), as well as in nonatelectatic areas, 40 +/- 3 PMN/10 HPF, higher than control values of 26 +/- 3 PMN/10 HPF (p < 0.05). In the atelectatic region, neutrophil sequestration was associated with increased protein concentration in lobar bronchoalveolar lavage (BAL) of 1370 +/- 100 mug/mL, higher than control values of 270 +/- 20 mug/mL (p < 0.05). Re-expansion also induced increases in lung wet-to-dry weight ratio (W/d) of 6.2 +/- 0.2, higher than control values of 4.3 +/- 0.1 (p < 0.05). Rendering rabbits neutropenic (n = 18) (0 to 4 PMN/mm3) limited the atelectasis-induced protein accumulations in BAL (520 +/- 60 mug/mL) and increase in lung W/d (5.2 +/- 0.1) (both p < 0.05). Intravenous (I.V.; treatment of another group (n = 18) with an anti-CD 18 monoclonal antibody (R 15.7, 1 mg/kg) before balloon deflation prevented leukopenia (6550 +/- 560 WBC/mm3), minimized neutrophil sequestration (36 +/- 2 PMN/10 HPF), and attenuated protein leak (710 +/- 95 mug/mL) and the increased lung W/d (5.6 +/- 0.1) (all p < 0.05). A final atelectatic group (n = 9) was treated I.V. with the anti-intercellular adhesion molecule-1 monoclonal antibody (RR 1/1, 1 mg/kg), which also prevented leukopenia and showed similar protection of microvascular barrier function. These data indicate that adherent neutrophils in large part mediate lung permeability and edema after atelectasis and re-expansion. Adhesion receptors of both neutrophils and endothelial cells regulate this event. C1 BRIGHAM & WOMENS HOSP,DEPT SURG,75 FRANCIS ST,BOSTON,MA 02115. BRIGHAM & WOMENS HOSP,DEPT PATHOL,BOSTON,MA 02115. HARVARD UNIV,SCH MED,BOSTON,MA 02115. BOSTON UNIV,USN,BOSTON,MA 02215. BOSTON UNIV,CTR BIOL SCI,BOSTON,MA 02215. BOEHRINGER INGELHEIM PHARMACEUT,RIDGEFIELD,CT. FU NHLBI NIH HHS [HL16714-13]; NIGMS NIH HHS [GM24891-11, GM35141-03] NR 37 TC 16 Z9 16 U1 0 U2 1 PU LIPPINCOTT-RAVEN PUBL PI PHILADELPHIA PA 227 EAST WASHINGTON SQ, PHILADELPHIA, PA 19106 SN 0003-4932 J9 ANN SURG JI Ann. Surg. PD SEP PY 1992 VL 216 IS 3 BP 372 EP 380 DI 10.1097/00000658-199209000-00017 PG 9 WC Surgery SC Surgery GA JQ081 UT WOS:A1992JQ08100017 PM 1417186 ER PT J AU FREDLAND, JE AF FREDLAND, JE TI THE ECONOMIC CONSEQUENCES OF THE VIETNAM-WAR - CAMPAGNA,AS SO ARMED FORCES & SOCIETY LA English DT Book Review RP FREDLAND, JE (reprint author), USN ACAD,DEPT ECON,ANNAPOLIS,MD 21402, USA. NR 2 TC 0 Z9 0 U1 0 U2 0 PU TRANSACTION PERIOD CONSORTIUM PI NEW BRUNSWICK PA DEPT 3091 RUTGERS-THE STATE UNIV OF NJ, NEW BRUNSWICK, NJ 08903 SN 0095-327X J9 ARMED FORCES SOC JI Armed Forces Soc. PD FAL PY 1992 VL 19 IS 1 BP 151 EP 153 DI 10.1177/0095327X9201900113 PG 3 WC Political Science; Sociology SC Government & Law; Sociology GA JY568 UT WOS:A1992JY56800013 ER PT J AU VANDYK, SD WEILER, KW PANAGIA, N AF VANDYK, SD WEILER, KW PANAGIA, N TI THE 20-CENTIMETER AND 6-CENTIMETER RADIO LIGHT CURVES FOR SN-1981K - A TYPE-II RADIO SUPERNOVA SO ASTROPHYSICAL JOURNAL LA English DT Article DE RADIO CONTINUUM, STARS; SUPERNOVAE, INDIVIDUAL (SN-1981K) ID LARGE ARRAY; EMISSION; MODELS AB We present new observations of the radio supernova SN 1981K made with the VLA at 20 and 6 cm from 1985 March through 1990 May, augmenting previous observations which began in 1982 January and extended through 1984 November. Since the radio emission from supernovae appears to fall into distinct classes, we can establish after the fact an optical classification for SN 1981K solely from the radio data. From its 20 and 6 cm radio light curves, we conclude that SN 1981K was a Type II supernova, with radio properties similar to those of SN 1979C and SN 1980K. C1 NATL RADIO ASTRON OBSERV,INST SPACE TELESCOPE SCI,SOCORRO,NM 87801. RP VANDYK, SD (reprint author), USN,RES LAB,CTR ADV SPACE SENSING,WASHINGTON,DC 20375, USA. NR 21 TC 16 Z9 16 U1 0 U2 0 PU UNIV CHICAGO PRESS PI CHICAGO PA 5720 S WOODLAWN AVE, CHICAGO, IL 60637 SN 0004-637X J9 ASTROPHYS J JI Astrophys. J. PD SEP 1 PY 1992 VL 396 IS 1 BP 195 EP 200 DI 10.1086/171709 PN 1 PG 6 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA JJ358 UT WOS:A1992JJ35800019 ER PT J AU HERTZ, P VAUGHAN, B WOOD, KS NORRIS, JP MITSUDA, K MICHELSON, PF DOTANI, T AF HERTZ, P VAUGHAN, B WOOD, KS NORRIS, JP MITSUDA, K MICHELSON, PF DOTANI, T TI X-RAY VARIABILITY OF SCORPIUS X-1 DURING A MULTIWAVELENGTH CAMPAIGN SO ASTROPHYSICAL JOURNAL LA English DT Article DE BINARIES, CLOSE; STARS, INDIVIDUAL (SCORPIUS X-1); STARS, VARIABLES, OTHER; X-RAYS, STARS ID QUASI-PERIODIC OSCILLATIONS; CYGNUS X-2; SPECTRAL BEHAVIOR; BINARIES; RADIO; ULTRAVIOLET; SEARCHES; GINGA; IUE AB Scorpius X-1 was observed with the Japanese X-ray satellite Ginga on 1989 March 9-11 as part of a multiwavelength campaign. The source was observed to be on the flaring branch for the first 31 hr, on the lower normal branch for the next 7 hr, and on the flaring branch during a brief observation 17 hr after the final normal branch observation. We constructed a standard color-color, or Z-, diagram for Sco X-1. We then parameterized the state of Sco X-1 by determining s(Z), the distance along the Z-diagram from the flaring branch-normal branch vertex, as a function of time. Sco X-1 moved smoothly and continuously through the Z-diagram and was never observed to jump from one branch to another. All observed spectral characteristics (intensity, X-ray hardness ratios) are well correlated with s(Z), indicating that the source changes its physical state smoothly as it moves along the Z-diagram. The tight correlation of observables with s(Z) is consistent with variation of a single physical parameter being responsible for the changes in state. There is no correlation between s(Z), the rate of change of s(Z), and observed spectral characteristics indicating that there is little, if any, hysteresis or memory in the spectral state of Sco X-1 and that motion in the Z-diagram is essentially stochastic. The range of observed values of s(Z) depends on s(Z):s(Z) always changes slowly along the flaring branch when it is near the flaring branch-normal branch vertex, but can change rapidly during the excursions up and down the flaring branch which correspond to large flares. A self-similarity is observed in the temporal profile of flares which is independent of flare amplitude. The temporal characteristics observed-including quasi-periodic oscillations, high-frequency noise, and very low frequency noise-are consistent with previous observations of Sco X-1. Quasi-periodic oscillations are observed on both the normal branch (6.3 Hz mean frequency) and the lower flaring branch (14.4 Hz mean frequency), but not on the upper flaring branch. Limits are placed on the fractional rms variation of quasi-periodic oscillations on the upper flaring branch of less than or similar 2% of the total intensity. The characteristics of the observed red noise components are found to vary along the flaring branch. The fractional rms variation of very low frequency noise increases from less than or similar 2% to greater than or similar to 6% as Sco X-1 moves from the flaring branch-normal branch vertex to the upper end of the flaring branch; the power-law index for very low frequency noise, alpha, remains constant along the flaring branch (alpha = 1.72 +/- 0.01). Both the rms fractional variation and the width of the high-frequency noise component vary as Sco X-1 moves out the flaring branch, with the rms fractional variation decreasing from approximately 3% to less than or similar 1% and the Gaussian rms width decreasing from approximately 15 Hz to approximately 5 Hz. No dependence on s(Z) is observed for any of the temporal characteristics. A search for coherent pulsations was made in both high time resolution optical and X-ray data. Limits on the 95% confidence limit pulsed amplitude are set at 0.10% (optical) and 0.19% (X-ray) for nu < 50 Hz and 0.26% (X-ray) for nu < 400 Hz. A search was made for optical quasi-periodic oscillations in data obtained while normal branch oscillations were observed in the Ginga data; none were seen with an upper limit to the fractional rms variation of 0.23% of the total intensity. C1 INST SPACE & ASTRONAUT SCI,SAGAMIHARA,KANAGAWA 229,JAPAN. STANFORD UNIV,DEPT PHYS,STANFORD,CA 94305. UNIV AMSTERDAM,ASTRON INST ANTON PANNEKOEK,1018 WB AMSTERDAM,NETHERLANDS. NASA,GODDARD SPACE FLIGHT CTR,HIGH ENERGY ASTROPHYS LAB,GREENBELT,MD 20771. RP HERTZ, P (reprint author), USN,RES LAB,EO HULBURT CTR SPACE RES,EO HULBURT C SPACE RES,CODE 4121,WASHINGTON,DC 20375, USA. RI Mitsuda, Kazuhisa/C-2649-2008 NR 51 TC 39 Z9 39 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 SEP 1 PY 1992 VL 396 IS 1 BP 201 EP 218 DI 10.1086/171710 PN 1 PG 18 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA JJ358 UT WOS:A1992JJ35800020 ER PT J AU LEGGETT, SK AF LEGGETT, SK TI INFRARED COLORS OF LOW-MASS STARS SO ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES LA English DT Article DE STARS, ABUNDANCES; STARS, FUNDAMENTAL PARAMETERS; STARS, LOW-MASS, BROWN DWARFS ID PROPER-MOTION STARS; M-DWARF STARS; NAVAL OBSERVATORY PARALLAXES; VISUAL MAGNITUDE 15; H-ALPHA PHOTOMETRY; BROWN DWARFS; FLARE STARS; CHROMOSPHERIC ACTIVITY; UBVRI PHOTOMETRY; FAINT STARS AB Infrared IJHK photometry is presented for 322 red dwarf stars. The photometry has an estimated mean error of 3% and has been taken mainly from the literature. Where available, optical UBVR and infrared LL'M photometry is also given. Stars with optical spectra available are classified using the TiO and VO bands. The spectra and published measures of H-alpha widths are used to identify stars with chromospheric activity. Space motions are calculated for stars with radial velocities, proper motions, and trigonometric parallaxes, and used to estimate kinematic population. Binary systems, implied by variable radial velocity measurements or reported in infrared imaging searches, are noted. The kinematic information allows us to identify metallicity effects in the infrared color:color diagrams. Metallicity variations lead to changes in the H- continuum opacity, and in the strength of the water vapor bands, which are clearly demonstrated in the infrared photometry. Nonintuitively, the water band absorption strength increases with decreasing metallicity. These opacity effects are used to group the stars into five metal-rich to metal-poor categories, ranging from young disk to halo. The photometric errors account for an uncertainty in this metallicity scheme of one class. As has been found previously, there is not an exact correspondence between metallicity and space motion, although trends are clear. Absolute magnitudes are determined for single stars with good quality trigonometric parallaxes, and infrared photometric parallax relations are derived for each metallicity group. The position of emission-line stars in the absolute-magnitude:color diagrams, and the frequency of chromospheric activity, are consistent with current ideas associating activity with either relative "youth" or with the presence of a companion. For young disk, old disk, and halo low-mass stars, we use the relatively metal-independent I - J as the primary temperature classifier, and give intrinsic, colors, spectral types and absolute magnitudes. These results will be useful for other observational studies and should also be used to constrain new models of both the interiors and atmospheres of low-mass stars, in an effort to resolve the current disagreements between theory and observation. C1 UNIV SPACE RES ASSOC,WASHINGTON,DC. RP LEGGETT, SK (reprint author), USN OBSERV,FLAGSTAFF STN,POB 1149,FLAGSTAFF,AZ 86002, USA. OI Leggett, Sandy/0000-0002-3681-2989 NR 118 TC 585 Z9 585 U1 1 U2 4 PU UNIV CHICAGO PRESS PI CHICAGO PA 5720 S WOODLAWN AVE, CHICAGO, IL 60637 SN 0067-0049 J9 ASTROPHYS J SUPPL S JI Astrophys. J. Suppl. Ser. PD SEP PY 1992 VL 82 IS 1 BP 351 EP 394 DI 10.1086/191720 PG 44 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA JK809 UT WOS:A1992JK80900012 ER PT J AU BHATIA, AK DOSCHEK, GA AF BHATIA, AK DOSCHEK, GA TI ATOMIC DATA AND SPECTRAL-LINE INTENSITIES FOR NE-LIKE FE-XVII SO ATOMIC DATA AND NUCLEAR DATA TABLES LA English DT Article ID COLLISION CROSS-SECTIONS; IONS; EXCITATION; STRENGTHS C1 USN,RES LAB,EO HULBURT CTR SPACE RES,WASHINGTON,DC 20375. RP BHATIA, AK (reprint author), NASA,GODDARD SPACE FLIGHT CTR,ASTRON & SOLAR PHYS LAB,GREENBELT,MD 20771, USA. NR 17 TC 73 Z9 73 U1 0 U2 1 PU ACADEMIC PRESS INC JNL-COMP SUBSCRIPTIONS PI SAN DIEGO PA 525 B ST, STE 1900, SAN DIEGO, CA 92101-4495 SN 0092-640X J9 ATOM DATA NUCL DATA JI Atom. Data Nucl. Data Tables PD SEP PY 1992 VL 52 IS 1 BP 1 EP 23 DI 10.1016/0092-640X(92)90007-5 PG 23 WC Physics, Atomic, Molecular & Chemical; Physics, Nuclear SC Physics GA JP535 UT WOS:A1992JP53500001 ER PT J AU CHIPMAN, SF AF CHIPMAN, SF TI RE-MEMBERING COGNITION SO BEHAVIORAL AND BRAIN SCIENCES LA English DT Article RP CHIPMAN, SF (reprint author), OFF NAVAL RES,COGNIT SCI PROGRAM,ARLINGTON,VA 22217, USA. NR 3 TC 0 Z9 0 U1 0 U2 0 PU CAMBRIDGE UNIV PRESS PI NEW YORK PA 40 WEST 20TH STREET, NEW YORK, NY 10011-4211 SN 0140-525X J9 BEHAV BRAIN SCI JI Behav. Brain Sci. PD SEP PY 1992 VL 15 IS 3 BP 441 EP 442 PG 2 WC Psychology, Biological; Behavioral Sciences; Neurosciences SC Psychology; Behavioral Sciences; Neurosciences & Neurology GA JN070 UT WOS:A1992JN07000006 PM 24924006 ER PT J AU LALOMIA, MJ COOVERT, MD SALAS, E AF LALOMIA, MJ COOVERT, MD SALAS, E TI PROBLEM-SOLVING PERFORMANCE AS A FUNCTION OF PROBLEM TYPE, NUMBER PROGRESSION, AND MEMORY LOAD SO BEHAVIOUR & INFORMATION TECHNOLOGY LA English DT Article DE PROBLEM-SOLVING; TABULAR DISPLAYS; GRAPHICAL DISPLAYS; VISUAL DISPLAYS; ERRORS; DISPLAY PREFERENCE ID GRAPHICAL PERCEPTION; COMPUTER-GRAPHICS; DECISION-MAKING; DISPLAYS; STATISTICS; FORMAT; IMPACT AB Problem-solving performance with tabular and graphical computer displays was examined as problem type, number progression, and memory capacity were systematically manipulated. Participants used tables and line graphs that depicted linear or multilinear number progressions to solve location, interpolation, trend analysis, and forecasting problems. Experiment 1, in which the displayed information was continuously available, indicated that participants' performance for identifying specific values was better with tables than with graphs. For trend analysis and interpolation problems graphs with multilinear data facilitated performance. While the forecasting tasks did not show any systematic effect of the factors. In Experiment 2, the displayed information was not continuously available, participants performed best with the graphical displays for most conditions. These results are discussed in terms of designing computer information displays. C1 UNIV S FLORIDA,TAMPA,FL 33620. USN,CTR TRAINING SYST,ORLANDO,FL. RP LALOMIA, MJ (reprint author), IBM CORP,2212 1000 NW 51 ST,BOCA RATON,FL 33432, USA. NR 42 TC 0 Z9 0 U1 1 U2 1 PU TAYLOR & FRANCIS LTD PI LONDON PA ONE GUNDPOWDER SQUARE, LONDON, ENGLAND EC4A 3DE SN 0144-929X J9 BEHAV INFORM TECHNOL JI Behav. Inf. Technol. PD SEP-OCT PY 1992 VL 11 IS 5 BP 268 EP 280 PG 13 WC Computer Science, Cybernetics; Ergonomics SC Computer Science; Engineering GA KG866 UT WOS:A1992KG86600004 ER PT J AU WASH, CH DESOUZA, RL RAMAMURTHY, M ANDERSEN, A BYRD, G JUSTUS, J EDMON, H SAMSON, P AF WASH, CH DESOUZA, RL RAMAMURTHY, M ANDERSEN, A BYRD, G JUSTUS, J EDMON, H SAMSON, P TI TEACHING WITH INTERACTIVE COMPUTER-SYSTEMS - A REPORT ON THE UNIDATA COMET STORM WORKSHOP ON SYNOPTIC MESOSCALE INSTRUCTION SO BULLETIN OF THE AMERICAN METEOROLOGICAL SOCIETY LA English DT Editorial Material AB This paper describes a workshop on instruction in mesoscale and synoptic meteorology organized by the Unidata Users Committee and held 18-21 June 1991 at the University of Colorado, Boulder, Colorado. The primary goal of the workshop was to exchange teaching and research methods and software using Unidata, COMET, and related technologies, and to identify steps to increase the effectiveness of Unidata and COMET programs in improving instruction and research in mesoscale and synoptic meteorology. The workshop documented the significant positive impact that Unidata McIDAS, SDM, GEMPAK, and campus distribution software was making on university instruction and introduced COMET and STORM software to the community. Presentations at the workshop gave overwhelming evidence of the success of the Unidata program and value of NOAA's COMET training effort. Numerous recommendations were made to enhance the use of microcomputers and workstations for instruction, including a significant new initiative to publish weather data regularly in electronic form. C1 MILLERSVILLE UNIV,DEPT EARTH SCI,MILLERSVILLE,PA. ST CLOUD STATE UNIV,DEPT EARTH SCI,ST CLOUD,MN. GEORGIA INST TECHNOL,SCH EARTH & ATMOSPHER SCI,ATLANTA,GA 30332. UNIV MICHIGAN,DEPT ATMOSPHER SCI,ANN ARBOR,MI 48109. SUNY COLL BROCKPORT,DEPT EARTH SCI,BROCKPORT,NY 14420. UNIV ILLINOIS,DEPT ATMOSPHER SCI,URBANA,IL 61801. UNIV WASHINGTON,DEPT ATMOSPHER SCI,SEATTLE,WA 98195. RP WASH, CH (reprint author), USN,POSTGRAD SCH,DEPT METEOROL,MONTEREY,CA 93940, USA. NR 6 TC 8 Z9 8 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 SEP PY 1992 VL 73 IS 9 BP 1440 EP 1447 PG 8 WC Meteorology & Atmospheric Sciences SC Meteorology & Atmospheric Sciences GA JP537 UT WOS:A1992JP53700006 ER PT J AU MALKINSON, AM SIEGEL, D FORREST, GL GAZDAR, AF OIE, HK CHAN, DC BUNN, PA MABRY, M DYKES, DJ HARRISON, SD ROSS, D AF MALKINSON, AM SIEGEL, D FORREST, GL GAZDAR, AF OIE, HK CHAN, DC BUNN, PA MABRY, M DYKES, DJ HARRISON, SD ROSS, D TI ELEVATED DT-DIAPHORASE ACTIVITY AND MESSENGER-RNA CONTENT IN HUMAN NON-SMALL-CELL LUNG-CARCINOMA - RELATIONSHIP TO THE RESPONSE OF LUNG-TUMOR XENOGRAFTS TO MITOMYCIN-C SO CANCER RESEARCH LA English DT Article ID BIOREDUCTIVE ALKYLATING-AGENTS; INDUCED DNA DAMAGE; NAD(P)H-QUINONE OXIDOREDUCTASE; HYPOXIC CONDITIONS; MOUSE LUNG; CANCER; REDUCTASE; LINES; GENE; METABOLISM AB The enzyme DT-diaphorase (DTD; NAD(P)H:quinone oxidoreductase, EC 1.6.99.2), is an obligate two electron reductase which catalyzes reduction of a broad range of substrates, including quinones. We report here variations in DTD concentrations among different classes of lung tumors known also to vary in their responsiveness to cytotoxic agents. Small cell lung carcinomas (SCLCs) and cell lines derived from them have the low DTD activities and mRNA content characteristic of normal human lung, whereas non-small cell lung carcinomas (NSCLCs) have greatly elevated levels. DTD activity was increased up to 80-fold in NSCLC tumors relative to normal lung and 20-35-fold in NSCLC relative to SCLC cell lines. Increased DTD activity appeared to be a function of the NSCLC phenotype rather than a result of derivation from a cell type rich in DTD, since all histological classes of NSCLC showed this phenotype. In addition, where transfection of SCLC cell lines with the v-Ha-ras protooncogene caused a transition to a NSCLC phenotype, DTD activity was also elevated. Neuroendocrine-positive cells (SCLC, carcinoids, and a few NSCLC lines) typically had far lower DTD activities than did cell lines which lacked neuroendocrine markers (most NSCLC cells and mesotheliomas). High DTD activity may be exploited in the design of drugs which undergo bioreductive activation by this enzyme. Consistent with this, xenografts derived from NSCLC cell lines with high DTD that were grown in athymic nude mice were more susceptible to the antitumor quinone, mitomycin C, than were xenografts derived from SCLC cells containing low DTD. These data provide a mechanistic basis for the rational design of more effective bioreductive antitumor agents for use against NSCLC. C1 UNIV COLORADO,MOLEC TOXICOL & ENVIRONM HLTH SCI,BOULDER,CO 80309. UNIV COLORADO,SCH PHARM,BOULDER,CO 80309. CITY HOPE NATL MED CTR,BECKMAN RES INT,DUARTE,CA 91010. NCI,USN,MED ONCOL BRANCH,BETHESDA,MD 20814. UNIV COLORADO,SCH MED,DIV MED ONCOL,DENVER,CO 80262. UNIV COLORADO,SCH MED,CTR CANC,DENVER,CO 80262. JOHNS HOPKINS UNIV,SCH MED,CTR ONCOL,BALTIMORE,MD 21205. SO RES INST,BIRMINGHAM,AL 35255. FU NCI NIH HHS [N01-CM-97553, R01 CA 51210]; NIEHS NIH HHS [R01 ES 02370] NR 46 TC 155 Z9 156 U1 0 U2 2 PU AMER ASSOC CANCER RESEARCH PI PHILADELPHIA PA PUBLIC LEDGER BLDG, SUITE 816, 150 S. INDEPENDENCE MALL W., PHILADELPHIA, PA 19106 SN 0008-5472 J9 CANCER RES JI Cancer Res. PD SEP 1 PY 1992 VL 52 IS 17 BP 4752 EP 4757 PG 6 WC Oncology SC Oncology GA JK679 UT WOS:A1992JK67900029 PM 1324793 ER PT J AU SAMPSON, JP PETERSON, GW REARDON, RC LENZ, JG SHAHNASARIAN, M RYANJONES, RE AF SAMPSON, JP PETERSON, GW REARDON, RC LENZ, JG SHAHNASARIAN, M RYANJONES, RE TI THE SOCIAL-INFLUENCE OF 2 COMPUTER-ASSISTED CAREER GUIDANCE SYSTEMS - DISCOVER AND SIGI SO CAREER DEVELOPMENT QUARTERLY LA English DT Article ID COUNSELOR BEHAVIOR; PERCEPTION AB Perceptions of expertness, attractiveness, and trustworthiness of computer-assisted guidance systems, as measured by an adapted version of the Counselor Rating Form (CRF), were compared for 107 college students in two treatment conditions (DISCOVER and SIGI) and a computer imaging control condition. Findings showed that students in the DISCOVER and SIGI conditions had more positive perceptions of the attractiveness of systems than those in the computer imaging group. In a review of related studies using the CRF in actual counseling, students seemed to attribute comparable levels of expertness to the computer, but not so with attractiveness or trustworthiness. Implications of these findings for the optimal use of CACG systems and for research are C1 FLORIDA STATE UNIV,CTR CAREER,TALLAHASSEE,FL 32306. FLORIDA STATE UNIV,COLL EDUC,TALLAHASSEE,FL 32306. FLORIDA STATE UNIV,CURRICULAR CAREER INFORMAT SERV,TALLAHASSEE,FL 32306. FLORIDA STATE UNIV,CTR STUDY TECHNOL COUNSELING & CAREER DEV,TALLAHASSEE,FL 32306. USN HOSP,SAN DIEGO,CA 92134. RP SAMPSON, JP (reprint author), FLORIDA STATE UNIV,DEPT HUMAN SERV & STUDIES,TALLAHASSEE,FL 32306, USA. NR 24 TC 6 Z9 6 U1 1 U2 1 PU AMER COUNSELING ASSOC PI ALEXANDRIA PA 5999 STEVENSON AVE, ALEXANDRIA, VA 22304-3300 SN 0889-4019 J9 CAREER DEV Q JI Career Dev. Q. PD SEP PY 1992 VL 41 IS 1 BP 75 EP 83 PG 9 WC Psychology, Applied SC Psychology GA JN840 UT WOS:A1992JN84000012 ER PT J AU RIVERA, JA CUMMINGS, SC MACYS, DA AF RIVERA, JA CUMMINGS, SC MACYS, DA TI INVITRO ACTIVATION OF LIPOPHILIC TRIBUTYLTINS BY SUPEROXIDE PRODUCES TRIBUTYLSTANNYL SUPEROXO RADICALS, PROPOSED INITIATORS OF LIPID-PEROXIDATION - AN EPR MODEL STUDY SO CHEMICAL RESEARCH IN TOXICOLOGY LA English DT Article ID TRIPHENYLTIN COMPOUNDS; HYDROGEN-PEROXIDE; GENERATION; AUTOXIDATION; MITOCHONDRIA; ERYTHROCYTE; HYPEROXIA; MEMBRANES; BUTYLTIN; EXCHANGE AB Tri-n-butyltin (TBT) compounds having the chemical formula (C4H9)3SnX are broad-spectrum biocidal agents whose toxic effect is primarily at the membrane level. Red blood cells (RBC) exposed to micromolar concentrations of tributyltin compounds (TBTX) undergo morphological changes and hemolysis. Determination of the mechanism of action whereby TBT elicits membrane damage continues to be a challenging endeavor. Because xenobiotic TBT+ and endogenous O2.- have been found to penetrate and alter RBC membrane function, it is hypothesized that they may combine chemically within the RBC hydrophobic lipid bilayer during TBT insult to initiate lipid peroxidative processes. The present study has been designed (1) to determine if TBT+ and O2.- combine chemically in aprotic media and, if so, (2) to characterize any free-radical complex(es) generated. The reactions of the membrane-active TBTX compounds (X = OCH3, Cl, Br, or I) with O2'- have been investigated in the aprotic solvent system cis-dicyclohexano-18-crown-6 ether/DMSO using EPR techniques. When incremental amounts of each TBT halide were added to O2' solutions at room temperature, the EPR signal characteristic of O2'- diminished in intensity and disappeared when a 1:1 O2'-/TBT+ mole ratio was attained. Although the same phenomenon was observed for all TBT halides used, only the KO2/TBTI reaction produced detectable amounts of a new oxygen-centered free-radical complex. The EPR spectral parameters calculated from the product anisotropic frozen glass spectra were g(x) = 2.054, a(x) = 31.7 G, g(y) = 2.021, g(z) = 2.002, g(av) = 2.026. These values compare favorably with those previously reported for TBTO2. radicals (g(iso) = 2.025-2.026) produced by photolysis and Sn(IV)(O2.-)Sn(IV) (a(x) = 30 G) radicals, produced by nonphotolytic methods. Conductivity measurements of dilute TBTX solutions demonstrate that the TBT halides exhibit 1:1 electrolytic behavior in DMSO and therefore dissociate to produce TBT+ cations. The EPR and conductivity data collectively suggest that two TBT+ cations and one O2.- anion combine chemically to produce (mu-superoxo)bis [tributylstannyl(I)] radicals, [(TBT)2O2].+, at room temperature. Possible ramifications of formation of these TBT-superoxo free-radical complexes in vivo are discussed. C1 WRIGHT STATE UNIV,DEPT CHEM,DAYTON,OH 45435. RP RIVERA, JA (reprint author), USN,MED RES INST DETACHMENT TOXICOL,BLDG 433,AREA B,WRIGHT PATTERSON FFB,DAYTON,OH 45433, USA. FU NHLBI NIH HHS [HL 15640] NR 37 TC 8 Z9 8 U1 1 U2 3 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0893-228X J9 CHEM RES TOXICOL JI Chem. Res. Toxicol. PD SEP-OCT PY 1992 VL 5 IS 5 BP 698 EP 705 DI 10.1021/tx00029a017 PG 8 WC Chemistry, Medicinal; Chemistry, Multidisciplinary; Toxicology SC Pharmacology & Pharmacy; Chemistry; Toxicology GA JN551 UT WOS:A1992JN55100017 PM 1332786 ER PT J AU SCHOEN, PE BEHROOZI, F GABER, BP HYBL, A SINGH, A AF SCHOEN, PE BEHROOZI, F GABER, BP HYBL, A SINGH, A TI CRYSTALLIZED PARATOLUENE SULFONATE DIACETYLENIC LIPID - A RAMAN-SPECTROSCOPIC STUDY SO CHEMISTRY AND PHYSICS OF LIPIDS LA English DT Article DE POLYMERIZABLE LIPID; RAMAN SCATTERING; RESONANCE RAMAN; DIACETYLENE; CRYSTALLINITY; 1,2-BIS-(TRICOSA 10,12 DIYNOYL)-RAC-GLYCERO-3-(PARA-TOLUENE-SULFONATE) ID PHOSPHATIDYLCHOLINE; POLYMERIZATION; BIOMEMBRANE; TUBULES AB The diacetylenic lipid, 1,2-bis-(tricosa 10,12 diynoyl)-rac-glycero-3-(-p-toluene-sulfonate), which is related to the tubule-forming lipid, 1,2-bis-(tricosa 10, 12 diynoyl)-sn-glycero-3-phosphocholine, has been synthesized and crystallized. The monoclinic crystal structures were polymerized by UV light and displayed strong red coloration when illuminated with light polarized along the crystalline a axis. Raman and resonance Raman spectra of the crystallized lipid were obtained as a function of its degree of polymerization. Spectral features sensitive to order in the lipid hydrocarbon chains reveal that the chains are highly ordered and that this order persists as polymerization proceeds. C1 UNIV WISCONSIN,DEPT PHYS,KENOSHA,WI 53141. UNIV MARYLAND,SCH MED,DEPT BIOPHYS,BALTIMORE,MD 21201. RP SCHOEN, PE (reprint author), USN,RES LAB,CTR BIOMOLEC SCI & ENGN,CODE 6090,WASHINGTON,DC 20375, USA. NR 18 TC 2 Z9 2 U1 1 U2 6 PU ELSEVIER SCI IRELAND LTD PI CLARE PA CUSTOMER RELATIONS MANAGER, BAY 15, SHANNON INDUSTRIAL ESTATE CO, CLARE, IRELAND SN 0009-3084 J9 CHEM PHYS LIPIDS JI Chem. Phys. Lipids PD SEP PY 1992 VL 62 IS 2 BP 139 EP 144 DI 10.1016/0009-3084(92)90091-3 PG 6 WC Biochemistry & Molecular Biology; Biophysics SC Biochemistry & Molecular Biology; Biophysics GA JT931 UT WOS:A1992JT93100006 ER PT J AU MARKOWITZ, MA SCHNUR, JM SINGH, A AF MARKOWITZ, MA SCHNUR, JM SINGH, A TI THE INFLUENCE OF THE POLAR HEADGROUPS OF ACIDIC DIACETYLENIC PHOSPHOLIPIDS ON TUBULE FORMATION, MICROSTRUCTURE MORPHOLOGY AND LANGMUIR FILM BEHAVIOR SO CHEMISTRY AND PHYSICS OF LIPIDS LA English DT Article DE DIACETYLENIC PHOSPHOLIPIDS; TUBULES; COUNTERION-HEADGROUP INTERACTION; MORPHOLOGY MODULATION; SURFACE-CHARGE SCREENING; MONOLAYER FILMS ID THERMOTROPIC PHASE-BEHAVIOR; LIPID TUBULES; BILAYERS; PH; PHOSPHATIDYLSERINE; MONOLAYERS; SURFACE; PHOSPHATIDYLCHOLINES; PHOSPHATIDYLGLYCEROL; LIPOSOMES AB The effect of modification of the polar headgroup of diacetylenic phospholipids on bilayer morphology and monolayer properties has been investigated. The lipids were prepared by substituting the choline -portion of 1,2-bis(10, 12-tricosadiynoyl)-sn-glycero-3-phosphocholine with the glycols HO(CH2)nOH (n = 2, 3, 4), by means of a phospholipase D catalyzed transphosphatidylation. In the presence of CuCl2 (PH 5.6 and ionic strength 0.18), the lipid with n = 2, produced a bimodal population of small diameter (0.1 mum) and large diameter (0.9 mum) tubules, the lipid for n = 3 produced a similar bimodal distribution of tubules except that the diameter of the smaller tubules increased to 0.3 mum. No small diameter tubules were formed from the lipid where n = 4. An increase or decrease either in the pH or ionic strength decreased the yield of tubules and affected the formation of the small diameter tubules, respectively. The counteranion of the metal salt present in the aqueous medium was also found to affect tubule diameter. The molecular area of the lipids was 70 A2/molecule (n = 2), 105 A2/molecule (n = 3) and 160 A2/molecule (n = 4). Monolayer studies suggested that the packing behavior of lipids at the air-water interface in the low surface pressure region was influenced by the subphase pH, ionic strength and counteranions. C1 USN,RES LAB,CTR BIOMOLEC SCI & ENGN,CODE 6090,WASHINGTON,DC 20375. NR 48 TC 38 Z9 38 U1 0 U2 11 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 SEP PY 1992 VL 62 IS 2 BP 193 EP 204 DI 10.1016/0009-3084(92)90097-9 PG 12 WC Biochemistry & Molecular Biology; Biophysics SC Biochemistry & Molecular Biology; Biophysics GA JT931 UT WOS:A1992JT93100012 ER PT J AU LAROCCO, A AMUNDSON, DE WALLACE, MR MALONE, JL OLDFIELD, EC AF LAROCCO, A AMUNDSON, DE WALLACE, MR MALONE, JL OLDFIELD, EC TI CORTICOSTEROIDS FOR PNEUMOCYSTIS-CARINII PNEUMONIA WITH ACUTE RESPIRATORY-FAILURE - EXPERIENCE WITH RESCUE THERAPY SO CHEST LA English DT Article ID ACQUIRED-IMMUNODEFICIENCY-SYNDROME; ADJUNCTIVE THERAPY; CONTROLLED TRIAL; AIDS AB Corticosteroids have proven effective as adjunctive therapy for the treatment of PCP in patients with AIDS, when begun within 72 h of conventional anti-Pneumocystis therapy. Their efficacy as rescue (or salvage) therapy in patients who have failed conventional therapy, however, remains unproven. Ths report presents our experience with 16 patients admitted to our MICU for acute respiratory failure (PaO2/FIO2. ratio less-than-or-equal-to 150) due to PCP. Five of six patients (83 percent) who received "primary" CS rescue (initial CS use prompted by acute respiratory failure after 72 h of conventional anti-Pneumocystis therapy) survived hospitalization. Our experience suggests that CSs may be effective even when started after 72 h of conventional therapy. Additional studies are needed to clarify the role of CS rescue therapy. C1 USN HOSP,DEPT CRIT CARE,HIV EVALUAT UNIT,SAN DIEGO,CA 92134. USN HOSP,DEPT CLIN INVEST,SAN DIEGO,CA 92134. RP LAROCCO, A (reprint author), USN HOSP,DEPT INTERNAL MED,DIV INFECT DIS,SAN DIEGO,CA 92134, USA. NR 17 TC 9 Z9 9 U1 1 U2 1 PU AMER COLL CHEST PHYSICIANS PI NORTHBROOK PA 3300 DUNDEE ROAD, NORTHBROOK, IL 60062-2348 SN 0012-3692 J9 CHEST JI Chest PD SEP PY 1992 VL 102 IS 3 BP 892 EP 895 DI 10.1378/chest.102.3.892 PG 4 WC Critical Care Medicine; Respiratory System SC General & Internal Medicine; Respiratory System GA JL857 UT WOS:A1992JL85700045 PM 1516418 ER PT J AU WAX, JR BLAKEMORE, KJ AF WAX, JR BLAKEMORE, KJ TI WHAT CAN BE LEARNED FROM CORDOCENTESIS SO CLINICS IN LABORATORY MEDICINE LA English DT Article RP WAX, JR (reprint author), USN HOSP,DEPT OBSTET & GYNECOL,PORTSMOUTH,VA 23708, USA. NR 0 TC 1 Z9 1 U1 0 U2 0 PU W B SAUNDERS CO PI PHILADELPHIA PA INDEPENDENCE SQUARE WEST CURTIS CENTER, STE 300, PHILADELPHIA, PA 19106-3399 SN 0272-2712 J9 CLIN LAB MED JI Clin. Lab. Med. PD SEP PY 1992 VL 12 IS 3 BP 503 EP 522 PG 20 WC Medical Laboratory Technology SC Medical Laboratory Technology GA JK329 UT WOS:A1992JK32900009 PM 1521425 ER PT J AU PASTERNACK, L AF PASTERNACK, L TI GAS-PHASE MODELING OF HOMOGENEOUS BORON OXYGEN HYDROGEN CARBON COMBUSTION SO COMBUSTION AND FLAME LA English DT Article ID REACTION-KINETICS; HBO; SPECTROSCOPY; CHEMISTRY; BH AB Boron has practical applications as an advanced fuel in propulsion systems due to its high energy content. The combustion of boron in the presence of hydrocarbon fuels is a complex problem involving heterogeneous particle oxidation followed by gas-phase kinetics of the volatilized boron species. In this study, we have modeled the high-temperature gas-phase combustion chemistry of the B/O/H/C system. We have examined the effects of recent experimental gas-phase kinetic measurements of several of the critical reaction rates and theoretical thermodynamic and transition state calculations on the previous model of boron combustion. Additional reactions that critically affect the combustion efficiency are identified for future experimental and theoretical study. The role of boron oxyhydrides, which are metastable species, is discussed. RP PASTERNACK, L (reprint author), USN,RES LAB,DIV CHEM,CODE 6111,WASHINGTON,DC 20375, USA. NR 29 TC 23 Z9 27 U1 0 U2 3 PU ELSEVIER SCIENCE INC PI NEW YORK PA 655 AVENUE OF THE AMERICAS, NEW YORK, NY 10010 SN 0010-2180 J9 COMBUST FLAME JI Combust. Flame PD SEP PY 1992 VL 90 IS 3-4 BP 259 EP 268 DI 10.1016/0010-2180(92)90087-6 PG 10 WC Thermodynamics; Energy & Fuels; Engineering, Multidisciplinary; Engineering, Chemical; Engineering, Mechanical SC Thermodynamics; Energy & Fuels; Engineering GA JH792 UT WOS:A1992JH79200004 ER PT J AU FRANTZICH, S AF FRANTZICH, S TI CONGRESSIONAL CAREERS - CONTOURS OF LIFE IN THE UNITED-STATES HOUSE-OF-REPRESENTATIVES - HIBBING,JR SO CONGRESS & THE PRESIDENCY-A JOURNAL OF CAPITAL STUDIES LA English DT Book Review RP FRANTZICH, S (reprint author), USN ACAD,ANNAPOLIS,MD 21402, USA. NR 1 TC 0 Z9 0 U1 1 U2 1 PU AMERICAN UNIV PI WASHINGTON PA CENT FOR CONGR & PRESIDENT ST, WASHINGTON, DC 20016 SN 0734-3469 J9 CONGR PRESIDENCY PD FAL PY 1992 VL 19 IS 2 BP 201 EP 203 PG 3 WC Political Science SC Government & Law GA KF562 UT WOS:A1992KF56200012 ER PT J AU KUNDU, A CHEN, JL AF KUNDU, A CHEN, JL TI TEXTURE CLASSIFICATION USING QMF BANK-BASED SUBBAND DECOMPOSITION SO CVGIP-GRAPHICAL MODELS AND IMAGE PROCESSING LA English DT Article ID RANDOM-FIELDS; SEGMENTATION; IMAGES C1 SUNY BUFFALO,DEPT ELECT & COMP ENGN,BUFFALO,NY 14260. RP KUNDU, A (reprint author), USN,CTR COMMAND CONTROL & OCEAN SYST,CODE 732,SAN DIEGO,CA 92152, USA. NR 31 TC 26 Z9 29 U1 0 U2 0 PU ACADEMIC PRESS INC JNL-COMP SUBSCRIPTIONS PI SAN DIEGO PA 525 B ST, STE 1900, SAN DIEGO, CA 92101-4495 SN 1049-9652 J9 CVGIP-GRAPH MODEL IM PD SEP PY 1992 VL 54 IS 5 BP 369 EP 384 DI 10.1016/1049-9652(92)90022-P PG 16 WC Computer Science, Software Engineering SC Computer Science GA JN191 UT WOS:A1992JN19100001 ER PT J AU LAVOIE, DM AF LAVOIE, DM TI COMPUTERIZED OCEANIC PARTICLE CHARACTERIZATION USING HEAVY-METAL STAINING, SEM, EDXS AND IMAGE-ANALYSIS SO DEEP-SEA RESEARCH PART A-OCEANOGRAPHIC RESEARCH PAPERS LA English DT Article ID SUSPENDED PARTICLES; LAKE AB Heterogeneous particles collected from seawater were analysed for physical dimensions and elemental composition using a computer-controlled image and chemical analysis system based on a scanning electron microscope and energy dispersive X-ray spectrometer. Staining the particles with the heavy metal ruthenium largely overcame the difficulties of forming an adequate image of organic particles that usually limits such automated analyses. Ruthenium staining provides an image comparable to that achieved with metal coatings, improves the contrast of organic particles, and provides a more uniform background grey level. In addition, this treatment simplifies sample preparation and improves the X-ray count rate compared with metal-coated specimens. The major X-ray energy peak of ruthenium interferes only with that of chlorine, which is usually removed during the sample preparation procedures. In its present configuration, the system can perform analyses of particles from 0.5 to 100-mu-m in one pass for abundance, size, shape, and elemental composition at a rate of about 500 particles per hour. A generalized particle classification scheme based on elemental proportions and ratios is presented for suspended marine particles. The scheme is applied to samples from three depths in the photic zone for a station in the Sargasso Sea. As illustrative data, particle abundance, volumes, and size-volume distributions are presented vs chemical class for the major types of particles found, and a bulk refractive index is calculated. RP LAVOIE, DM (reprint author), USN,OCEANOG & ATMOSPHER RES LAB,DIV OCEANOG,BAY ST LOUIS,MS 39529, USA. NR 28 TC 10 Z9 10 U1 0 U2 1 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0198-0149 J9 DEEP-SEA RES PD SEP PY 1992 VL 39 IS 9A BP 1655 EP 1668 DI 10.1016/0198-0149(92)90054-W PG 14 WC Oceanography SC Oceanography GA JM314 UT WOS:A1992JM31400014 ER PT J AU ROBINSON, KM ROBINSON, IK OGRADY, WE AF ROBINSON, KM ROBINSON, IK OGRADY, WE TI ELECTROCHEMICALLY INDUCED SURFACE-ROUGHNESS ON AU(100) STUDIED BY SURFACE X-RAY-DIFFRACTION SO ELECTROCHIMICA ACTA LA English DT Article; Proceedings Paper CT 5TH INTERNATIONAL FISCHER SYMP ON ADSORBATES, INTERMEDIATES AND INHIBITORS CY JUN 16-20, 1991 CL UNIV KARLSRUHE, KARLSRUHE, GERMANY SP DEUT FORSCHUNGSGEMEINSCH, STATE BADEN WURTTEMBERG, BADISCHE LANDESBAUSPARKASSE KARLSRUHE, GIULINI, SCHLUMBERGER TECHNOL MUNCHEN HO UNIV KARLSRUHE DE AU(100) ELECTROCHEMISTRY; SURFACE STRUCTURE; SURFACE DIFFRACTION; SYNCHROTRON RADIATION ID ELECTRODE; REDUCTION; CELL AB The surface of an electropolished Au(100) single crystal has been investigated by synchrotron X-ray diffraction. The crystal was examined after having swept the potential into the double layer of the oxide and hydrogen regions. The results show that there is very little change in the surface atomic roughness from the double layer through the oxide region. When cycled into the hydrogen region, where minimal H-2 production is measured, the surface becomes very rough. No evidence for inducing the (5 x 20) hexagonal reconstruction was observed. C1 AT&T BELL LABS,MURRAY HILL,NJ 07974. RP ROBINSON, KM (reprint author), USN,RES LAB,DIV CHEM,CODE 6170,WASHINGTON,DC 20375, USA. NR 12 TC 11 Z9 11 U1 1 U2 4 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0013-4686 J9 ELECTROCHIM ACTA JI Electrochim. Acta PD SEP PY 1992 VL 37 IS 12 BP 2169 EP 2172 DI 10.1016/0013-4686(92)85107-V PG 4 WC Electrochemistry SC Electrochemistry GA JM293 UT WOS:A1992JM29300008 ER PT J AU LITTLE, B WAGNER, P MANSFELD, F AF LITTLE, B WAGNER, P MANSFELD, F TI AN OVERVIEW OF MICROBIOLOGICALLY INFLUENCED CORROSION SO ELECTROCHIMICA ACTA LA English DT Article; Proceedings Paper CT 5TH INTERNATIONAL FISCHER SYMP ON ADSORBATES, INTERMEDIATES AND INHIBITORS CY JUN 16-20, 1991 CL UNIV KARLSRUHE, KARLSRUHE, GERMANY SP DEUT FORSCHUNGSGEMEINSCH, STATE BADEN WURTTEMBERG, BADISCHE LANDESBAUSPARKASSE KARLSRUHE, GIULINI, SCHLUMBERGER TECHNOL MUNCHEN HO UNIV KARLSRUHE DE CORROSION; MICROORGANISMS; ELECTROCHEMISTRY; BIOFILMS; INTERFACIAL PROCESSES ID SULFATE-REDUCING BACTERIA; STAINLESS-STEEL; ELECTROCHEMICAL TECHNIQUES; COPPER; SEAWATER; EXOPOLYMERS; SURFACES; BEHAVIOR AB Biofilms on metal surfaces produce an environment at the biofilm/metal interface that is radically different from that of the bulk medium in terms of pH, dissolved oxygen, organic and inorganic species. The term microbiologically influenced corrosion (MIC) is used to designate corrosion due to the presence and activities of microorganisms within biofilms. In this review we have correlated electrochemical reactions to the activities of microorganisms to show that microorganisms can accelerate rates of partial reactions in corrosion processes or alter the corrosion mechanism. C1 UNIV SO CALIF,DEPT MAT SCI,LOS ANGELES,CA 90089. RP LITTLE, B (reprint author), USN,OCEANOG & ATMOSPHER RES LAB,BAY ST LOUIS,MS 39529, USA. NR 84 TC 65 Z9 71 U1 0 U2 16 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0013-4686 J9 ELECTROCHIM ACTA JI Electrochim. Acta PD SEP PY 1992 VL 37 IS 12 BP 2185 EP 2194 DI 10.1016/0013-4686(92)85110-7 PG 10 WC Electrochemistry SC Electrochemistry GA JM293 UT WOS:A1992JM29300011 ER PT J AU MANSFELD, F LITTLE, B AF MANSFELD, F LITTLE, B TI MICROBIOLOGICALLY INFLUENCED CORROSION OF COPPER-BASED MATERIALS EXPOSED TO NATURAL SEAWATER SO ELECTROCHIMICA ACTA LA English DT Article; Proceedings Paper CT 5TH INTERNATIONAL FISCHER SYMP ON ADSORBATES, INTERMEDIATES AND INHIBITORS CY JUN 16-20, 1991 CL UNIV KARLSRUHE, KARLSRUHE, GERMANY SP DEUT FORSCHUNGSGEMEINSCH, STATE BADEN WURTTEMBERG, BADISCHE LANDESBAUSPARKASSE KARLSRUHE, GIULINI, SCHLUMBERGER TECHNOL MUNCHEN HO UNIV KARLSRUHE DE CORROSION; MICROORGANISMS; ELECTROCHEMISTRY; BIOFILMS; INTERFACIAL PROCESSES ID STAINLESS-STEELS; ALLOYS; BEHAVIOR; BIOFILMS AB Copper surfaces exposed to natural seawater were colonized by bacteria within 3 weeks of exposure independent of alloy composition. In all cases, corrosion rates were higher for copper alloys in natural seawater compared with artificial seawater. The complexity of impedance spectra was attributed to the formation of surface layers and the contributions of charge transfer and mass transport controlled reactions mediated by surface layers. Intergranular corrosion and denickelification of 70Cu:30Ni was observed after 1 month. C1 USN,OCEANOG & ATMOSPHER RES LAB,BAY ST LOUIS,MS 39529. RP MANSFELD, F (reprint author), UNIV SO CALIF,DEPT MAT SCI,LOS ANGELES,CA 90089, USA. NR 36 TC 21 Z9 21 U1 4 U2 5 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0013-4686 J9 ELECTROCHIM ACTA JI Electrochim. Acta PD SEP PY 1992 VL 37 IS 12 BP 2291 EP 2297 DI 10.1016/0013-4686(92)85125-5 PG 7 WC Electrochemistry SC Electrochemistry GA JM293 UT WOS:A1992JM29300026 ER PT J AU KIRK, MT DODDS, RH AF KIRK, MT DODDS, RH TI APPROXIMATE TECHNIQUES OF J-ESTIMATION APPLICABLE TO PART-THROUGH SURFACE CRACKS SO ENGINEERING FRACTURE MECHANICS LA English DT Note AB This investigation concerns the accuracy with which three different J estimation schemes can predict the variation of applied J with applied strain for semi-elliptical surface cracks. The three estimation schemes considered were a weight function technique proposed by Bhandari, a modification of the EPRI estimation scheme proposed by Ainsworth, and Turner's Engineering-J design curve. Each of these techniques is simple enough to employ in design, the most arduous calculation required being that needed to determine the linear elastic stress intensity factor. Estimation scheme accuracy was assessed by comparing J predictions to finite-element results for three small semi-elliptical surface cracks in a moderately hardening steel loaded in either pure tension or pure bending. The results obtained indicate that, for applied strains up to three times the yield strain, both the weight function and the modified EPRI schemes under estimate applied J by between 23 and 83% depending on the applied strain level. Conversely, Turner's Engineering-J design curve provides accurate or conservative (i.e. over) estimates of applied J in both tension and bending provided total crack size is less than 3% of the total cross sectional area and maximum crack depth is less than 25% of the plate thickness. Application to larger and deeper cracks loaded in tension is not recommended as the design curve does not conservatively account for net section yielding in these situations. The design curve can still be applied in bending to cracks of size up to 7.4% of the total cross sectional area. However, the degree of conservatism inherent in this application may be considered excessive in certain situations. C1 UNIV ILLINOIS,DEPT CIVIL ENGN,URBANA,IL 61801. RP KIRK, MT (reprint author), USN,DAVID TAYLOR RES CTR,ANNAPOLIS,MD 21402, USA. NR 22 TC 1 Z9 1 U1 0 U2 1 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0013-7944 J9 ENG FRACT MECH JI Eng. Fract. Mech. PD SEP PY 1992 VL 43 IS 1 BP 123 EP 136 DI 10.1016/0013-7944(92)90319-A PG 14 WC Mechanics SC Mechanics GA JJ498 UT WOS:A1992JJ49800013 ER PT J AU MEYN, DA AF MEYN, DA TI TECHNIQUES OF OPTICAL CAUSTICS PHOTOGRAPHY SO ENGINEERING FRACTURE MECHANICS LA English DT Article ID CRACKING AB The method of caustics has been used for many years for studying deformations around crack tips in metals and other materials, but a systematic and easy-to-understand description of the principles and practice of photographing high quality caustics images has not been made available to potential practitioners of the method. This paper describes how sharp, high contrast caustic images can be obtained using simple equipment and procedures based on well-known principles of geometrical optics. The critical parameters are the light source diameter, which must be small, and its distance from the reflecting surface, which must be large; and high resolution, short depth of field and high initial magnification of the photographic system. Monochromatic filters or laser light sources can improve caustic images if the lens used is not highly corrected for chromatic errors. If collimated (parallel) light is desired to avoid making corrections for the divergence of the illumination, long focal length collimator lenses are necessary to minimize the light source diameter contribution to the caustic ring thickness. RP MEYN, DA (reprint author), USN,RES LAB,CODE 6327,WASHINGTON,DC 20375, USA. NR 9 TC 9 Z9 9 U1 0 U2 2 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0013-7944 J9 ENG FRACT MECH JI Eng. Fract. Mech. PD SEP PY 1992 VL 43 IS 2 BP 185 EP & DI 10.1016/0013-7944(92)90121-T PG 0 WC Mechanics SC Mechanics GA JP748 UT WOS:A1992JP74800005 ER PT J AU BOOTH, A AF BOOTH, A TI TO CAPTION ABSENT BODIES, ROBINSON,MARILYNNE 'HOUSEKEEPING' SO ESSAYS IN LITERATURE LA English DT Article RP BOOTH, A (reprint author), USN ACAD,ANNAPOLIS,MD 21402, USA. NR 3 TC 1 Z9 1 U1 1 U2 1 PU WESTERN ILLINOIS UNIV PI MACOMB PA DEPT ENGLISH 114 SIMPKINS HALL, MACOMB, IL 61455 SN 0094-5404 J9 ESSAYS LITERATURE JI Essays Lit. PD FAL PY 1992 VL 19 IS 2 BP 279 EP 290 PG 12 WC Literature SC Literature GA KQ007 UT WOS:A1992KQ00700009 ER PT J AU SHANNON, KM TURHAN, AG ROGERS, PCJ KAN, YW AF SHANNON, KM TURHAN, AG ROGERS, PCJ KAN, YW TI EVIDENCE IMPLICATING HETEROZYGOUS DELETION OF CHROMOSOME-7 IN THE PATHOGENESIS OF FAMILIAL LEUKEMIA ASSOCIATED WITH MONOSOMY-7 SO GENOMICS LA English DT Article ID NEUROFIBROMATOSIS TYPE-1 GENE; CHRONIC MYELOGENOUS LEUKEMIA; ENDOCRINE NEOPLASIA TYPE-2A; BONE-MARROW MONOSOMY-7; LONG ARM; MYELODYSPLASTIC SYNDROME; HUMAN RETINOBLASTOMA; MOLECULAR MECHANISM; ATAXIA-PANCYTOPENIA; CONSERVED STRUCTURE C1 BRITISH COLUMBIA CHILDRENS HOSP,DEPT PEDIAT,VANCOUVER V6H 344,BC,CANADA. HOWARD HUGHES MED INST,SAN FRANCISCO,CA 94143. UNIV CALIF SAN FRANCISCO,DEPT LAB MED,SAN FRANCISCO,CA 94143. USN HOSP,DEPT PEDIAT,OAKLAND,CA 94627. USN HOSP,DEPT CLIN INVEST,OAKLAND,CA 94627. BRITISH COLUMBIA CANC RES CTR,KERRY FOX LAB,VANCOUVER V5Z 1L3,BC,CANADA. USN HOSP,CTR CLIN INVEST,OAKLAND,CA 94627. NR 45 TC 44 Z9 44 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 0888-7543 J9 GENOMICS JI Genomics PD SEP PY 1992 VL 14 IS 1 BP 121 EP 125 DI 10.1016/S0888-7543(05)80293-9 PG 5 WC Biotechnology & Applied Microbiology; Genetics & Heredity SC Biotechnology & Applied Microbiology; Genetics & Heredity GA JK971 UT WOS:A1992JK97100020 PM 1358790 ER PT J AU CERBONE, MJA MAYO, JA CUTHBERTSON, BA OCONNELL, RA AF CERBONE, MJA MAYO, JA CUTHBERTSON, BA OCONNELL, RA TI GROUP-THERAPY AS AN ADJUNCT TO MEDICATION IN THE MANAGEMENT OF BIPOLAR AFFECTIVE-DISORDER SO GROUP LA English DT Article ID MANIC-DEPRESSIVE ILLNESS; LITHIUM AB This paper asserts that, contrary to the beliefs of many clinicians, patients with bipolar affective disorder often experience a deteriorating course characterized by pervasive social dysfunction. It reviews the literature, identifying a rationale for group psychotherapy as an adjunct to medication in the management of these chronic patients. It outlines a theoretical approach to bipolar group therapy, and presents a retrospective study comparing the course of 43 lithium-treated bipolar patients before and after entering bipolar groups. During the year in group therapy, bipolar patients displayed significant improvements in symptom relief as well as social functioning. It is proposed that group process enhances treatment with medication, providing benefits not evident with medication alone. C1 ST VINCENTS HOSP & MED CTR,DEPT PSYCHIAT,NEW YORK,NY 10011. RP CERBONE, MJA (reprint author), USN HOSP,DEPT PSYCHIAT,SAN DIEGO,CA 92134, USA. NR 13 TC 23 Z9 24 U1 0 U2 0 PU HUMAN SCI PRESS INC PI NEW YORK PA 233 SPRING ST, NEW YORK, NY 10013-1578 SN 0362-4021 J9 GROUP JI Group PD FAL PY 1992 VL 16 IS 3 BP 174 EP 187 DI 10.1007/BF02078885 PG 14 WC Psychology, Clinical SC Psychology GA JP287 UT WOS:A1992JP28700005 ER PT J AU NADELLA, RK VELLANKI, J RAO, MV DIETRICH, HB AF NADELLA, RK VELLANKI, J RAO, MV DIETRICH, HB TI DC CHARACTERISTICS OF HIGH-BREAKDOWN-VOLTAGE P-I-N-DIODES MADE BY 20-MEV SI IMPLANTATION IN INPFE SO IEEE ELECTRON DEVICE LETTERS LA English DT Article ID FE; LAYER AB A vertical p-i-n diode is made for the first time in InP:Fe using megaelectronvolt energy ion implantation. A 20-MeV Si implantation and kiloelectronvolt energy Be / P coimplantation are used to obtain a buried n + layer and a shallow p + layer, respectively. The junction area of the device is 2.3 X 10(-5) cm2 and the intrinsic region thickness is almost-equal-to 3-mu-m. The device has a high breakdown voltage of 110 V, reverse leakage current of 0.1 mA / cm2 at -80 V, off-state capacitance of 2.2 nF / cm2 at -20 V, and a dc incremental forward resistance of 4-OMEGA at 40 mA. C1 USN,RES LAB,WASHINGTON,DC 20375. RP NADELLA, RK (reprint author), GEORGE MASON UNIV,DEPT ELECT & COMP ENGN,FAIRFAX,VA 22030, USA. NR 11 TC 4 Z9 4 U1 0 U2 0 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0741-3106 J9 IEEE ELECTR DEVICE L JI IEEE Electron Device Lett. PD SEP PY 1992 VL 13 IS 9 BP 473 EP 475 DI 10.1109/55.192799 PG 3 WC Engineering, Electrical & Electronic SC Engineering GA JJ719 UT WOS:A1992JJ71900011 ER PT J AU MADAN, RN AF MADAN, RN TI MAXIMUM-ENTROPY METHOD AND THE DESIGN OF LINEAR-PHASE FIR FILTERS SO IEEE TRANSACTIONS ON CIRCUITS AND SYSTEMS II-ANALOG AND DIGITAL SIGNAL PROCESSING LA English DT Article AB This paper describes new procedure that makes use of the maximum entropy method (MEM) for the design of linear phase FIR digital filters. It is shown here that by applying MEM to the inverse of the desired gain function or its square root function, it is possible to generate linear phase FIR filters that match the given gain function to any desired degree of accuracy. Further, an iterative algorithm makes the design procedure very efficient, since the higher order filters can be recursively generated from the lower order ones. To minimize any residual distortion in the passband region, a final averaging scheme on the lower order filters generates a class of linear phase FIR filters that are practically distortion free in the passband as well as the stopband. Simulation results that compare the present procedure with other well known methods are also presented. RP MADAN, RN (reprint author), OFF NAVAL RES,CODE 1114,ARLINGTON,VA 22217, USA. NR 20 TC 0 Z9 0 U1 0 U2 0 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 1057-7130 J9 IEEE T CIRCUITS-II JI IEEE Trans. Circuits Syst. II-Analog Digit. Signal Process. PD SEP PY 1992 VL 39 IS 9 BP 611 EP 618 DI 10.1109/82.193315 PG 8 WC Engineering, Electrical & Electronic SC Engineering GA KN090 UT WOS:A1992KN09000003 ER PT J AU SMITH, ST CHAYT, GA AF SMITH, ST CHAYT, GA TI TRANSMISSION-LINE AMPLIFIERS SO IEEE TRANSACTIONS ON ELECTRON DEVICES LA English DT Article ID DISTRIBUTED-AMPLIFIER AB A thermionic vacuum-tube power amplifier is analyzed in which an extended and continuous grid and cathode serve,as an input transmission line that excites a corresponding traveling-wave signal on a similar transmission line between the screen grid and anode. The bandwidth is extremely wide because the usual gain-bandwidth product limitation is avoided by making the input and output capacitances part of the transmission lines. The gain mechanism is the same as that in the usual power tetrode in that bunched charges are delivered (or pumped) to the anode at the proper time and location along the anode transmission line to enhance the traveling-wave signal. If line attenuation losses are small, the power gain increases as the square of line length. Part of the backward wave can become a forward wave by tapering the impedance of the output line. A potential possibility is that this type of amplifier can employ a field-emission cathode and thus avoid the high heater power as well as the slow transit time between the cathode and grid of the thermionic emitter. Disadvantages of this type of amplifier are low gain and low input impedance. C1 USN,RES LAB,WASHINGTON,DC 20375. RP SMITH, ST (reprint author), LOCUS INC,ALEXANDRIA,VA, USA. NR 13 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 0018-9383 J9 IEEE T ELECTRON DEV JI IEEE Trans. Electron Devices PD SEP PY 1992 VL 39 IS 9 BP 2165 EP 2171 DI 10.1109/16.155888 PG 7 WC Engineering, Electrical & Electronic; Physics, Applied SC Engineering; Physics GA JJ516 UT WOS:A1992JJ51600025 ER PT J AU ABRAHAMS, J LIPMAN, MJ AF ABRAHAMS, J LIPMAN, MJ TI ZERO-REDUNDANCY CODING FOR UNEQUAL CODE SYMBOL COSTS SO IEEE TRANSACTIONS ON INFORMATION THEORY LA English DT Letter DE VARIABLE-LENGTH SOURCE CODING; ZERO REDUNDANCY; UNEQUAL COSTS AB Source distributions that can be encoded with zero redundancy for the case of unequal code symbol costs are examined. These distributions provide a natural generalization of the binary, equal costs case for which these distributions are the dyadic distributions. These zero redundancy codes have the property that the expected proportion of codeword symbols given by a particular letter is equal to an exponential function of the code letter cost. The converse is not true in general, however partial converse results hold. Maximum-entropy zero-redundancy distributions are easily identified through their connection with unequal cost coding for uniform sources. RP ABRAHAMS, J (reprint author), OFF NAVAL RES,DIV MATH SCI,CODE 1111,ARLINGTON,VA 22217, 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 0018-9448 J9 IEEE T INFORM THEORY JI IEEE Trans. Inf. Theory PD SEP PY 1992 VL 38 IS 5 BP 1583 EP 1586 DI 10.1109/18.149512 PG 4 WC Computer Science, Information Systems; Engineering, Electrical & Electronic SC Computer Science; Engineering GA JJ134 UT WOS:A1992JJ13400017 ER PT J AU SCHNEIDER, CS CANNELL, PY WATTS, KT AF SCHNEIDER, CS CANNELL, PY WATTS, KT TI MAGNETOELASTICITY FOR LARGE STRESSES SO IEEE TRANSACTIONS ON MAGNETICS LA English DT Article; Proceedings Paper CT 1992 INTERNATIONAL MAGNETICS CONF ( INTERMAG 92 ) - MAGNETIC RECORDING HEADS : INDUCTIVE THIN FILM AND LAMINATED CY APR 13-16, 1992 CL ST LOUIS, MO SP ALLEGHENY LUDLUM, ALLIED SIGNAL, APPL MAGNET, BASF MAGNET, BOHLMAN TACHNET, CRUCIBLE MAGNET, EASTMAN KODAK, F G JONES ASSOC, FUJITSU, GEC AB A model of magnetoelasticity based on the differential susceptibility, the stress effective magnetic field and stress demagnetization in conjunction with appropriate rules of hysteresis is presented and compared to experimental data for high strength steels for several magnetoelastic processes, including H-sigma-sigma-BAR, HH-sigma-sigma-BAR, sigma-H, and sigma-sigma-H-BAR, where symbols indicate the order of application and removal of stress and field. We observe a decrease in stress effectiveness and define a saturation anisotropy factor which decreases from unity in the Rayleigh region to less than one half for our values of stress and field. The model also predicts the stressed saturate hysteresis loop and equilibrium near the anhysteretic curve and enables understanding of the Villari reversal of magnetoelastic sensitivity. C1 USN,CTR SURFACE WARFARE,ANNAPOLIS,MD 21402. RP SCHNEIDER, CS (reprint author), USN ACAD,DEPT PHYS,ANNAPOLIS,MD 21402, USA. NR 20 TC 40 Z9 42 U1 0 U2 5 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0018-9464 J9 IEEE T MAGN JI IEEE Trans. Magn. PD SEP PY 1992 VL 28 IS 5 BP 2626 EP 2631 DI 10.1109/20.179578 PN 2 PG 6 WC Engineering, Electrical & Electronic; Physics, Applied SC Engineering; Physics GA JN877 UT WOS:A1992JN87700172 ER PT J AU HARRIS, VG AYLESWORTH, KD DAS, BN ELAM, WT KOON, NC AF HARRIS, VG AYLESWORTH, KD DAS, BN ELAM, WT KOON, NC TI DETERMINATION OF THE STRUCTURAL ANISOTROPY IN AMORPHOUS TB-FE FILMS SO IEEE TRANSACTIONS ON MAGNETICS LA English DT Article; Proceedings Paper CT 1992 INTERNATIONAL MAGNETICS CONF ( INTERMAG 92 ) - MAGNETIC RECORDING HEADS : INDUCTIVE THIN FILM AND LAMINATED CY APR 13-16, 1992 CL ST LOUIS, MO SP ALLEGHENY LUDLUM, ALLIED SIGNAL, APPL MAGNET, BASF MAGNET, BOHLMAN TACHNET, CRUCIBLE MAGNET, EASTMAN KODAK, F G JONES ASSOC, FUJITSU, GEC ID ABSORPTION FINE-STRUCTURE; MAGNETIC-ANISOTROPY; THIN-FILMS; FERRIMAGNETIC ALLOYS; METALLIC FILMS AB We report the measurement and description of an anisotropy between the in-plane and out-of-plane atomic structure in as-deposited amorphous Tb-Fe alloy films. This anisotropy, measured using a conversion-electron extended x-ray absorption fine structure (EXAFS) technique, correlates closely with measured values of the perpendicular magnetic anisotropy energy as a function of both film composition and annealing temperature. Modeling of the EXAFS data using theoretical codes and structural standards suggests that the Tb-Tb and Fe-Fe pair correlations are greater parallel to the film plane and the Tb-Fe pair correlations are greater perpendicular to the film plane. Upon annealing at 300-degrees-C the structural anisotropy is eliminated and the magnetic anisotropy is lowered to a level consistent with magnetoelastic interactions between the film and substrate. RP HARRIS, VG (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 31 TC 8 Z9 8 U1 0 U2 5 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0018-9464 J9 IEEE T MAGN JI IEEE Trans. Magn. PD SEP PY 1992 VL 28 IS 5 BP 2958 EP 2963 DI 10.1109/20.179685 PN 2 PG 6 WC Engineering, Electrical & Electronic; Physics, Applied SC Engineering; Physics GA JN877 UT WOS:A1992JN87700277 ER PT J AU CLARK, AE WUNFOGLE, M RESTORFF, JB LINDBERG, JF AF CLARK, AE WUNFOGLE, M RESTORFF, JB LINDBERG, JF TI MAGNETOMECHANICAL PROPERTIES OF SINGLE-CRYSTAL TBXDY1-X UNDER COMPRESSIVE STRESS SO IEEE TRANSACTIONS ON MAGNETICS LA English DT Article; Proceedings Paper CT 1992 INTERNATIONAL MAGNETICS CONF ( INTERMAG 92 ) - MAGNETIC RECORDING HEADS : INDUCTIVE THIN FILM AND LAMINATED CY APR 13-16, 1992 CL ST LOUIS, MO SP ALLEGHENY LUDLUM, ALLIED SIGNAL, APPL MAGNET, BASF MAGNET, BOHLMAN TACHNET, CRUCIBLE MAGNET, EASTMAN KODAK, F G JONES ASSOC, FUJITSU, GEC AB The magnetic and magnetostrictive properties of the TbxDy1-x highly magnetostrictive alloys were measured in the region of large magnetostriction to anisotropy (lambda(gamma,2)/K6(6) ratios (x = 0.5, 0.6 and 0.67). Magnetizations and magnetostrictions under compressive stresses up to 25 MPa and fields up to 2 kOe were compared to theoretical curves. Field dependences clearly display magnetization discontinuities and magnetic rotation regions. From these data and from corresponding elastic modulus measurements, permeabilities (mu(sigma)), piezomagnetic d-constants (d33) and elastic compliances (s(H)) were calculated. For some values of stress and magnetic field, DELTA-E effects > 10 and coupling factors (k33) approach unity. C1 USN,CTR UNDERSEA WARFARE,DIV TRANSDUCER & ARRAYS,NEW LONDON,CT 06320. RP CLARK, AE (reprint author), USN,CTR SURFACE WARFARE,DEPT RES & TECHNOL,SILVER SPRING,MD 20903, USA. NR 4 TC 14 Z9 14 U1 0 U2 1 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0018-9464 J9 IEEE T MAGN JI IEEE Trans. Magn. PD SEP PY 1992 VL 28 IS 5 BP 3156 EP 3158 DI 10.1109/20.179743 PN 2 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied SC Engineering; Physics GA JN877 UT WOS:A1992JN87700335 ER PT J AU DORSEY, P SEED, R VITTORIA, C CHRISEY, DB CAROSELLA, C LUBITZ, P HORWITZ, JS AF DORSEY, P SEED, R VITTORIA, C CHRISEY, DB CAROSELLA, C LUBITZ, P HORWITZ, JS TI ORIENTED BARIUM HEXAFERRITE THIN-FILMS PREPARED BY PULSED LASER DEPOSITION SO IEEE TRANSACTIONS ON MAGNETICS LA English DT Article; Proceedings Paper CT 1992 INTERNATIONAL MAGNETICS CONF ( INTERMAG 92 ) - MAGNETIC RECORDING HEADS : INDUCTIVE THIN FILM AND LAMINATED CY APR 13-16, 1992 CL ST LOUIS, MO SP ALLEGHENY LUDLUM, ALLIED SIGNAL, APPL MAGNET, BASF MAGNET, BOHLMAN TACHNET, CRUCIBLE MAGNET, EASTMAN KODAK, F G JONES ASSOC, FUJITSU, GEC AB Oriented thin films of barium hexaferrite, BaFe12O19, were grown in situ on (0001) sapphire substrates utilizing a pulsed laser deposition technique. X-ray diffractions (XRD), elastic backscattering spectrometry (EBS), ferrimagnetic resonance (FMR) and vibrating sample magnetometry (VSM) confirm that the structure, composition and magnetic parameters are consistent with films prepared by other techniques such as liquid phase epitaxy (LPE). C1 USN,RES LAB,WASHINGTON,DC 20375. RP DORSEY, P (reprint author), NORTHEASTERN UNIV,BOSTON,MA 02115, USA. NR 7 TC 16 Z9 17 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 0018-9464 J9 IEEE T MAGN JI IEEE Trans. Magn. PD SEP PY 1992 VL 28 IS 5 BP 3216 EP 3218 DI 10.1109/20.179763 PN 2 PG 3 WC Engineering, Electrical & Electronic; Physics, Applied SC Engineering; Physics GA JN877 UT WOS:A1992JN87700355 ER PT J AU SUBRAMANIAN, CS LIGRANI, PM TUZZOLO, MF AF SUBRAMANIAN, CS LIGRANI, PM TUZZOLO, MF TI SURFACE HEAT-TRANSFER AND FLOW PROPERTIES OF VORTEX ARRAYS INDUCED ARTIFICIALLY AND FROM CENTRIFUGAL INSTABILITIES SO INTERNATIONAL JOURNAL OF HEAT AND FLUID FLOW LA English DT Article DE EMBEDDED VORTICES; CENTRIFUGAL INSTABILITY; VORTEX ARRAY; VORTEX SPACING ID TURBULENT BOUNDARY-LAYERS; VORTICES AB Fluid-flow and heat transfer properties from artificially induced vortices in a flat-plate turbulent boundary layer and naturally occurring vortices due to centrifugal instabilities in a curved-channel laminar flow are presented and compared. Pairs and arrays of vortices are artificially induced by placing half-delta wings on the plate surface. With both arrays and pairs of vortices, streamwise velocities and total pressures are high, and surface heat transfer is locally augmented in vortex downwash regions. As the spacing between the vortices increases, downwash areas span larger regions and, correspondingly, increase areas where the heat transfer is more than that for the surrounding nominally two-dimensional turbulent boundary layer. In contrast to vortices in the arrays, vortices in the pairs tend to move in the streamwise direction with significant divergence (when the common flow between pair is towards the wall) or convergence (when the common flow between pair is away from the wall). The vortices in the arrays cause maximum peak-to-peak heat transfer variations of up to 12% of local spanwise-averaged values for initial vortex spacings (assuming vortex spacing to be proportional to the vortex-generator spacing, which is measured between the mid-chord points) between 1 to 2.5 generator heights. Vortex arrays that form on concave surfaces due to centrifugal instabilities give rise to distributions of mean velocity components and surface heat transfer that are qualitatively similar to the distributions for the boundary layer with artificially generated array of vortices. Streamwise mean velocity, total pressure, and local heat transfer values are high in the vortex downwash regions and are low in the vortex upwash regions. But because the naturally developed vortices at Dean number of 100 are considerably weaker than the artificially induced vortices, they cause maximum peak-to-peak heat transfer variations of only about 6% of the local spanwise-averaged values. C1 UNIV UTAH,DEPT MECH ENGN,MEB 3209,SALT LAKE CITY,UT 84112. FLORIDA INST TECHNOL,DEPT MECH & AEROSP ENGN,MELBOURNE,FL 32901. USN,POSTGRAD SCH,DEPT MECH ENGN,MONTEREY,CA 93940. OI Subramanian, Chelakara S./0000-0003-4149-2972 NR 29 TC 8 Z9 8 U1 0 U2 1 PU BUTTERWORTH-HEINEMANN PI WOBURN PA 225 WILDWOOD AVE #UNITB PO BOX 4500, WOBURN, MA 01801-2084 SN 0142-727X J9 INT J HEAT FLUID FL JI Int. J. Heat Fluid Flow PD SEP PY 1992 VL 13 IS 3 BP 210 EP 223 DI 10.1016/0142-727X(92)90034-7 PG 14 WC Thermodynamics; Engineering, Mechanical; Mechanics SC Thermodynamics; Engineering; Mechanics GA JN003 UT WOS:A1992JN00300001 ER PT J AU GEERNAERT, GL KELLER, WC AF GEERNAERT, GL KELLER, WC TI ON THE WIND POWER LAW AND ATMOSPHERIC STABILITY EFFECTS IN OCEAN SCATTEROMETRY SO ISPRS JOURNAL OF PHOTOGRAMMETRY AND REMOTE SENSING LA English DT Article AB In this study, C-band scatterometer measurements reported by Keller et al. (1989), are reanalyzed in order to find the exponent of the power law dependence of scattering cross-section on ocean surface wind stress for a 45-degrees incidence angle. The exponent is found by two methods: first, by observing the change in backscatter with change in wind stress over a range of windspeeds from 6 to 13 ms-1 using neutrally stratified conditions, and second, by considering nearly constant windspeed and observing the change of wind stress induced by dramatic variations in the air-sea temperature difference. We employ Monin-Obukhov theory for the second method. Our results indicate that both methods produce a power law exponent with a value near 1.2. Given that both methods produce nearly the same value for the exponent, these results suggest that variations of radar cross-section induced by atmospheric stability, when the model function is defined in terms of windspeed, can be accounted for entirely by Monin-Obukhov theory and variation of the wind stress drag coefficient with stability. It also suggests that if the model function uses friction velocity as the wind parameter, then neither the mean or variance of radar cross-section observations should exhibit a dependence on atmospheric stability, and atmospheric stability becomes an irrelevant parameter to radar scatterometer model functions when friction velocity is used. RP GEERNAERT, GL (reprint author), OFF NAVAL RES,800 N QUINCY ST,ARLINGTON,VA 22217, USA. NR 0 TC 2 Z9 2 U1 1 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0924-2716 J9 ISPRS J PHOTOGRAMM JI ISPRS-J. Photogramm. Remote Sens. PD SEP-OCT PY 1992 VL 47 IS 5-6 BP 369 EP 386 DI 10.1016/0924-2716(92)90039-C PG 18 WC Geography, Physical; Geosciences, Multidisciplinary; Remote Sensing; Imaging Science & Photographic Technology SC Physical Geography; Geology; Remote Sensing; Imaging Science & Photographic Technology GA JY087 UT WOS:A1992JY08700002 ER PT J AU PANDE, CS MARSH, SP AF PANDE, CS MARSH, SP TI THE ANALYTICAL MODELING OF NORMAL GRAIN-GROWTH SO JOM-JOURNAL OF THE MINERALS METALS & MATERIALS SOCIETY LA English DT Article ID COMPUTER-SIMULATION; GAS APPROXIMATION; SIZE DISTRIBUTION; SELF-SIMILARITY; MICROSTRUCTURE; CERAMICS; TOPOLOGY; METALS AB A fundamental understanding of grain-growth phenomena provides a means to predict and control many of the observed material properties. This article reviews the development and present state of analytical theories of grain growth. The major geometric, dynamic, and statistical factors that must be considered in a rigorous formulation of grain dynamics are outlined. RP PANDE, CS (reprint author), USN,RES LAB,DIV MAT SCI & TECHNOL,MAT CHARACTERIZAT SECT,WASHINGTON,DC 20375, USA. NR 37 TC 4 Z9 4 U1 1 U2 1 PU MINERALS METALS MATERIALS SOC PI WARRENDALE PA 420 COMMONWEALTH DR, WARRENDALE, PA 15086 SN 1047-4838 J9 JOM-J MIN MET MAT S JI JOM-J. Miner. Met. Mater. Soc. PD SEP PY 1992 VL 44 IS 9 BP 25 EP 29 PG 5 WC Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering; Mineralogy; Mining & Mineral Processing SC Materials Science; Metallurgy & Metallurgical Engineering; Mineralogy; Mining & Mineral Processing GA JM874 UT WOS:A1992JM87400006 ER PT J AU URBACH, JR KHALILY, C MITCHELL, PP AF URBACH, JR KHALILY, C MITCHELL, PP TI EROTOMANIA IN AN ADOLESCENT - CLINICAL AND THEORETICAL CONSIDERATIONS SO JOURNAL OF ADOLESCENCE LA English DT Article ID PURE C1 USN,ARLINGTON,VA 22217. RP URBACH, JR (reprint author), VIRGINIA COMMONWEALTH UNIV,MED COLL VIRGINIA,DEPT PSYCHIAT,RICHMOND,VA 23298, USA. NR 34 TC 9 Z9 9 U1 0 U2 0 PU ACADEMIC PRESS LTD PI LONDON PA 24-28 OVAL RD, LONDON, ENGLAND NW1 7DX SN 0140-1971 J9 J ADOLESCENCE JI J. Adolesc. PD SEP PY 1992 VL 15 IS 3 BP 231 EP 240 DI 10.1016/0140-1971(92)90027-3 PG 10 WC Psychology, Developmental SC Psychology GA JQ981 UT WOS:A1992JQ98100002 PM 1447410 ER PT J AU TAI, TC AF TAI, TC TI DIRECT SIMULATION OF LOW-DENSITY FLOW OVER AIRFOILS SO JOURNAL OF AIRCRAFT LA English DT Article AB The low-density aerodynamics about airfoils in the transition region is considered using a direct simulation Monte Carlo method. Numerical results are presented for two airfoils (the NACA-0009 and a 9% thick, circular-arc airfoil) traveling at Mach 4 and 5, at an angle of attack of 1.25 deg and altitudes 56 and 62 miles above sea level. The flow, having a Knudsen number range between 0.47-1.15 and a Reynolds number range between 15-114, departs considerably from the continuum theory. Results indicate that both lift and drag are very much penalized in the transition region. In contrast with previous work on slightly rarefied flow with smaller Knudsen numbers (slip flow regime), the effect of rarefaction becomes much more dominant than that due to viscosity. RP TAI, TC (reprint author), USN,CTR SURFACE WARFARE,DEPT SYST,CARDEROCK DIV,BETHESDA,MD 20084, USA. NR 0 TC 1 Z9 1 U1 0 U2 2 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 SEP-OCT PY 1992 VL 29 IS 5 BP 806 EP 810 DI 10.2514/3.46249 PG 5 WC Engineering, Aerospace SC Engineering GA JQ533 UT WOS:A1992JQ53300009 ER PT J AU FARROW, S BANTA, G SCHALLHORN, S MAY, R MERS, A CADARET, L RYDSTEDT, L LOCKETTE, W AF FARROW, S BANTA, G SCHALLHORN, S MAY, R MERS, A CADARET, L RYDSTEDT, L LOCKETTE, W TI VASOPRESSIN INHIBITS DIURESIS INDUCED BY WATER IMMERSION IN HUMANS SO JOURNAL OF APPLIED PHYSIOLOGY LA English DT Article DE 1-DESAMINO-8-D-ARGININE VASOPRESSIN; HUMAN STUDIES; PLASMA VOLUME; ATRIAL PEPTIDE; ALDOSTERONE; NATRIURESIS ID ATRIAL NATRIURETIC FACTOR; RAT; DEHYDRATION AB We tested the hypothesis that 1-desamino-8-D-arginine vasopressin (DDAVP), a V2-receptor agonist, could inhibit the diuresis induced by water immersion in humans. Water and electrolyte excretion, plasma atrial natriuretic factor concentration, and plasma aldosterone concentration were measured initially and after 3 h of water immersion in 13 healthy sodium-replete men given either placebo or 20 mug of intranasal DDAVP. Guanosine 3',5'-cyclic monophosphate and urea excretion and urine osmolality were also determined. DDAVP inhibited the diuresis induced by water immersion in men: 758 +/- 168 (SE) ml/3 h in the placebo group vs. 159 +/- 28 ml/3 h in the DDAVP group (P < 0.05). After 3 h of water immersion, plasma atrial natriuretic factor concentrations were increased from 11 +/- 2 to 20 +/- 4 pg/ml in the placebo group and from 14 +/-2 to 33 +/- 4 pg/ml in the DDAVP group (P < 0.05). Plasma aldosterone concentrations were decreased from 98 +/- 18 to 45 +/- 6 pg/ml in the placebo group (P < 0.05) and from 54 +/- 17 to 25 +/- 5 pg/ml in the DDAVP group (P < 0.05). Despite these changes in aldosterone and atrial natriuretic factor concentrations, which should increase sodium excretion, DDAVP decreased the natriuresis induced by water immersion in humans: 56 +/- 8 meq Na+/3 h in the placebo group vs. 36 +/- 6 meq Na+/3 h in the DDAVP group (P < 0.05). DDAVP may be used to prevent the diuresis associated with central redistribution of blood volumes that occur during water immersion. Furthermore, it is suggested from this study that the V2-receptor has a direct effect on the control of sodium excretion in humans. C1 WAYNE STATE UNIV,SCH MED,DIV ENDOCRINOL,4201 ST ANTOINE,DETROIT,MI 48201. UNIV MICHIGAN,SCH MED,ANN ARBOR,MI 48109. VET ADM MED CTR,ALLEN PK,MI 48101. USN,HLTH RES CTR,SAN DIEGO,CA 92186. NR 22 TC 6 Z9 6 U1 0 U2 0 PU AMER PHYSIOLOGICAL SOC PI BETHESDA PA 9650 ROCKVILLE PIKE, BETHESDA, MD 20814 SN 8750-7587 J9 J APPL PHYSIOL JI J. Appl. Physiol. PD SEP PY 1992 VL 73 IS 3 BP 932 EP 936 PG 5 WC Physiology; Sport Sciences SC Physiology; Sport Sciences GA JP517 UT WOS:A1992JP51700023 PM 1400058 ER PT J AU GLAZEBROOK, KD BAILEY, MP WHITAKER, LR AF GLAZEBROOK, KD BAILEY, MP WHITAKER, LR TI COST RATE HEURISTICS FOR SEMI-MARKOV DECISION-PROCESSES SO JOURNAL OF APPLIED PROBABILITY LA English DT Article DE DYNAMIC PROGRAMMING; REPLACEMENT POLICY ID OPTIMAL REPLACEMENT; STRATEGY AB In response to the computational complexity of the dynamic programming/backwards induction approach to the development of optimal policies for semi-Markov decision processes, we propose a class of heuristics resulting from an inductive process which proceeds forwards in time. These heuristics always choose actions in such a way as to minimize some measure of the current cost rate. We describe a procedure for calculating such cost rate heuristics. The quality of the performance of such policies is related to the speed of evolution (in a cost sense) of the process. A simple model of preventive maintenance is described in detail. Cost mte heuristics for this problem are calculated and assessed computationally. C1 USN,POSTGRAD SCH,MONTEREY,CA 93943. RP GLAZEBROOK, KD (reprint author), UNIV NEWCASTLE UPON TYNE,DEPT MATH & STAT,NEWCASTLE TYNE NE1 7RU,TYNE & WEAR,ENGLAND. NR 15 TC 3 Z9 3 U1 0 U2 0 PU APPLIED PROBABILITY TRUST PI SHEFFIELD PA THE UNIVERSITY DEPT PROB AND STATISTICS, SHEFFIELD, ENGLAND S3 7RH SN 0021-9002 J9 J APPL PROBAB JI J. Appl. Probab. PD SEP PY 1992 VL 29 IS 3 BP 633 EP 644 DI 10.2307/3214900 PG 12 WC Statistics & Probability SC Mathematics GA JN977 UT WOS:A1992JN97700013 ER PT J AU GIBSON, WK TIMPERLAKE, RW AF GIBSON, WK TIMPERLAKE, RW TI OPERATIVE TREATMENT OF A TYPE-IV MONTEGGIA FRACTURE-DISLOCATION IN A CHILD SO JOURNAL OF BONE AND JOINT SURGERY-BRITISH VOLUME LA English DT Note RP GIBSON, WK (reprint author), USN HOSP,DEPT ORTHOPAED,CODE 608,PORTSMOUTH,VA 23708, USA. NR 3 TC 4 Z9 4 U1 0 U2 0 PU BRITISH EDITORIAL SOC BONE JOINT SURGERY PI LONDON PA 22 BUCKINGHAM STREET, LONDON, ENGLAND WC2N 6ET SN 0301-620X J9 J BONE JOINT SURG BR JI J. Bone Joint Surg.-Br. Vol. PD SEP PY 1992 VL 74 IS 5 BP 780 EP 781 PG 2 WC Orthopedics; Surgery SC Orthopedics; Surgery GA JN764 UT WOS:A1992JN76400034 PM 1527134 ER PT J AU MCKAY, PJ TERICH, TA AF MCKAY, PJ TERICH, TA TI GRAVEL BARRIER MORPHOLOGY - OLYMPIC-NATIONAL-PARK, WASHINGTON-STATE, USA SO JOURNAL OF COASTAL RESEARCH LA English DT Article DE GRAVEL BARRIERS; BARRIER EVOLUTION; BARRIER MORPHOLOGY AB Three gravel barriers studied along the Olympic Coast of Washington State display morphology and textural characteristics similar to those barriers reported along the coasts of Ireland, England and Nova Scotia. Resistant headlands serve as anchor points for two of the three barriers. Headlands are not, however, a necessary prerequisite for their development. These barriers seem to follow an evolutionary model of development and destruction somewhat similar to those in the literature. RP MCKAY, PJ (reprint author), USN STN,BOX 16 CODE OCSE,SAN DIEGO,CA 92136, USA. NR 0 TC 12 Z9 12 U1 1 U2 4 PU COASTAL EDUCATION & RESEARCH FOUNDATION PI LAWRENCE PA 810 EAST 10TH STREET, LAWRENCE, KS 66044 SN 0749-0208 J9 J COASTAL RES JI J. Coast. Res. PD FAL PY 1992 VL 8 IS 4 BP 813 EP 829 PG 17 WC Environmental Sciences; Geography, Physical; Geosciences, Multidisciplinary SC Environmental Sciences & Ecology; Physical Geography; Geology GA KX288 UT WOS:A1992KX28800005 ER PT J AU HOWELL, BF AF HOWELL, BF TI EFFECT OF EXPANDING MONOMER ON CARBON FIBER-REINFORCED EPOXY COMPOSITES SO JOURNAL OF COMPOSITES TECHNOLOGY & RESEARCH LA English DT Article DE DINORBORNENE SPIROORTHOCARBONATE; EPOXY; EXPANDING MONOMER; INTERFEROMETRY; MICROINDENTATION TEST; POLYMER; RESIDUAL STRAIN ID MATRICES; STRESS; RESIN AB In this investigation, it was confirmed that copolymerization of dinorbornene spiroorthocarbonate (DNSOC) with epoxy can reduce sample shrinkage without degrading mechanical properties. To maximize control of shrinkage, it is important to bring epoxy to the gel stage before the DNSOC begins to copolymerize. DGEBA epoxy was cured with m-phenylenediamine (mPDA) and DNSOC-epoxy samples were cured with mPDA and BF3.diethylenetriamine (BF3 was used to catalyze polymerization of the DNSOC). As compared with carbon fiber-reinforced epoxy, the sample with 5% by weight DNSOC showed 33% reduction in interfacial shear stress as measured by the microindentation test and reduction in residual stress perpendicular to the plies by interferometry. However, the 9% greater fiber volume fraction in the epoxy sample can account for some of these changes. The resin itself showed an increase in tensile strength when 5% by weight DNSOC was incorporated, and the sample showed little shrinkage. RP HOWELL, BF (reprint author), USN,CTR SURFACE WARFARE,CARDEROCK DIV,ANNAPOLIS DETACHMENT,CODE 2844,ANNAPOLIS,MD 21402, USA. NR 9 TC 2 Z9 2 U1 1 U2 4 PU AMER SOC TESTING MATERIALS PI W CONSHOHOCKEN PA 100 BARR HARBOR DR, W CONSHOHOCKEN, PA 19428-2959 SN 0884-6804 J9 J COMPOS TECH RES JI J. Compos. Technol. Res. PD FAL PY 1992 VL 14 IS 3 BP 169 EP 175 PG 7 WC Materials Science, Composites; Polymer Science SC Materials Science; Polymer Science GA JY517 UT WOS:A1992JY51700004 ER PT J AU BRADY, JG GRANDE, DJ KATZ, AE AF BRADY, JG GRANDE, DJ KATZ, AE TI THE PURSE-STRING SUTURE IN FACIAL RECONSTRUCTION SO JOURNAL OF DERMATOLOGIC SURGERY AND ONCOLOGY LA English DT Article ID EXCISION AB Mohs surgical defects in 26 patients were reconstructed utilizing a purse-string suture and a full-thickness graft. The placement of the purse-string suture decreased the surface area of the wound an average of 53%. A full-thickness graft was then placed in the remaining defect. This technique enabled us to repair large wounds of the facial region with a relatively small full-thickness graft. There were no complications in our series. The resultant areas were cosmetically acceptable and resistant to trauma. C1 USN HOSP,DEPT DERMATOL,SAN DIEGO,CA 92134. TUFTS UNIV,SCH MED,DEPT DERMATOL,BOSTON,MA 02111. SUNY STONY BROOK,DIV OTOLARYNGOL,STONY BROOK,NY 11794. SUNY STONY BROOK,DIV HEAD & NECK SURG,STONY BROOK,NY 11794. NR 14 TC 45 Z9 45 U1 0 U2 0 PU ELSEVIER SCIENCE INC PI NEW YORK PA 655 AVENUE OF THE AMERICAS, NEW YORK, NY 10010 SN 0148-0812 J9 J DERMATOL SURG ONC PD SEP PY 1992 VL 18 IS 9 BP 812 EP 816 PG 5 WC Oncology; Dermatology; Surgery SC Oncology; Dermatology; Surgery GA JL730 UT WOS:A1992JL73000006 PM 1512314 ER PT J AU RAO, MV GULWADI, SM MULPURI, S SIMONS, DS CHI, PH CANEAU, C HONG, WP HOLLAND, OW DIETRICH, HB AF RAO, MV GULWADI, SM MULPURI, S SIMONS, DS CHI, PH CANEAU, C HONG, WP HOLLAND, OW DIETRICH, HB TI CO-IMPLANTS, FE-IMPLANTS, AND TI-IMPLANTS IN INGAAS AND CO-IMPLANTS IN INP AT 200-DEGREES-C SO JOURNAL OF ELECTRONIC MATERIALS LA English DT Article DE INP; INGAAS; IMPLANTATION; ANNEALING ID RUTHERFORD BACKSCATTERING; COMPOUND SEMICONDUCTORS; ANNEALING BEHAVIOR; REDISTRIBUTION; GAAS; IN0.53GA0.47AS; MANGANESE; DIFFUSION; CHROMIUM; ENERGY AB Elevated temperature (200-degrees-C) single- and multiple-energy Co implants in n-type InP, Co and Fe implants in n-type In0.53Ga0.47As, and Ti implants in p-type In0.53Ga0.47As were performed. For elevated temperature, single-energy Co and Fe implants, no satellite peaks at various locations like 0.8 R(P), R(P) + DELTA-R(P), and 2R(P) (R(P) is the projected range and DELTA-R(P) the straggle of the implant) are observed, in contrast to the case of room temperature implants. However, the outdiffusion of the implant is as severe as that in room temperature implantation for high temperature anneals. Indiffusion of the implant also occurs, but it is not as severe as the outdiffusion. High temperature annealing of Ti-implanted material results in a slight indiffusion of Ti, with minimal redistribution or outdiffusion. For all elevated temperature implants, the lattice quality of the annealed material is close to that of the virgin unimplanted material. For all ion species used in this study, resistivities close to the intrinsic limit are obtained in the implanted and annealed materials. C1 NATL INST STAND & TECHNOL,GAITHERSBURG,MD 20899. BELLCORE,RED BANK,NJ 07701. OAK RIDGE NATL LAB,OAK RIDGE,TN 37831. USN,RES LAB,WASHINGTON,DC 20375. RP RAO, MV (reprint author), GEORGE MASON UNIV,DEPT ELECT & COMP ENGN,FAIRFAX,VA 22030, USA. NR 25 TC 8 Z9 8 U1 0 U2 3 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 SEP PY 1992 VL 21 IS 9 BP 923 EP 928 DI 10.1007/BF02665550 PG 6 WC Engineering, Electrical & Electronic; Materials Science, Multidisciplinary; Physics, Applied SC Engineering; Materials Science; Physics GA JN294 UT WOS:A1992JN29400009 ER PT J AU VOLAREVIC, S NIKLINSKA, BB BURNS, CM YAMADA, H JUNE, CH DUMONT, FJ ASHWELL, JD AF VOLAREVIC, S NIKLINSKA, BB BURNS, CM YAMADA, H JUNE, CH DUMONT, FJ ASHWELL, JD TI THE CD45 TYROSINE PHOSPHATASE REGULATES PHOSPHOTYROSINE HOMEOSTASIS AND ITS LOSS REVEALS A NOVEL PATTERN OF LATE T-CELL RECEPTOR INDUCED CA2+ OSCILLATIONS SO JOURNAL OF EXPERIMENTAL MEDICINE LA English DT Article ID LEUKOCYTE-COMMON ANTIGEN; MONOCLONAL-ANTIBODY; DIFFERENTIATION ANTIGENS; INTERLEUKIN-2 PRODUCTION; PROTEIN-KINASE; FREE CALCIUM; ZETA-CHAIN; ACTIVATION; PHOSPHORYLATION; PP60C-SRC AB CD45 is a transmembrane tyrosine phosphatase implicated in T cell antigen receptor (TCR)-mediated activation. In T cell variants expressing progressively lower levels of CD45 (from normal to undetectable), CD45 expression was inversely related to spontaneous tyrosine phosphorylation of multiple proteins, including the TCR zeta-chain, and was directly correlated with TCR-driven phosphoinositide hydrolysis. The Ca2+ response in these cells was altered in an unexpected fashion. Unlike wild-type cells, stimulated CD45- cell populations did not manifest an early increase in intracellular Ca2+, but did exhibit a delayed and gradual increase in mean intracellular Ca2+. Computer-aided fluorescence imaging of individual cells revealed that CD45- cells experienced late Ca2+ oscillations that were not blocked by removal of extracellular Ca2+. CD45 revertants had the signaling properties of wild-type cells. Thus, CD45 has a profound influence on both TCR-mediated signaling and phosphotyrosine homeostasis, and its loss reveals a novel role for this tyrosine phosphatase in Ca2+ regulation. C1 NCI,BIOL RESPONSE MODIFIERS PROGRAM,IMMUNE CELL BIOL LAB,BLDG 10,BETHESDA,MD 20892. MERCK SHARP & DOHME LTD,DEPT IMMUNOL RES,RAHWAY,NJ 07065. USN,MED RES INST,IMMUNE CELL BIOL PROGRAM,BETHESDA,MD 20889. NR 44 TC 90 Z9 90 U1 0 U2 0 PU ROCKEFELLER UNIV PRESS PI NEW YORK PA 1114 FIRST AVE, 4TH FL, NEW YORK, NY 10021 SN 0022-1007 J9 J EXP MED JI J. Exp. Med. PD SEP 1 PY 1992 VL 176 IS 3 BP 835 EP 844 DI 10.1084/jem.176.3.835 PG 10 WC Immunology; Medicine, Research & Experimental SC Immunology; Research & Experimental Medicine GA JK427 UT WOS:A1992JK42700022 PM 1380977 ER PT J AU SARPKAYA, T AF SARPKAYA, T TI BRIEF REVIEWS OF SOME TIME-DEPENDENT FLOWS SO JOURNAL OF FLUIDS ENGINEERING-TRANSACTIONS OF THE ASME LA English DT Article ID BOUNDARY-LAYER SEPARATION; IMPULSIVELY STARTED CYLINDER; CIRCULAR-CYLINDER; FREE-SURFACE; TRAILING VORTICES; OSCILLATORY FLOW; INVISCID MODEL; STEADY FLOW; UNSTEADY; AIRFOILS AB Separated flows in general and time-dependent flows in particular provide fertile territory for fundamental research in fluid dynamics and account for much of the subject matter. Thus, it is thought appropriate to review some of these unsteady flows with special emphasis on hydrodynamic applications which are, admittedly, of special interest to this writer. unsteady separation, characteristics of impulsively and nonimpulsively-started flow about cylinders; excursion of separation points on circular cylinders in oscillating flow; separation and other flow phenomena governing the unsteady maneuvers of large submerged bodies, and, finally, the three-dimensional footprints of subsurface vortical structures rising toward the free surface. It is hoped that these concise reviews will enhance communication between various groups of researchers, draw attention to many exciting phenomena in naval hydrodynamics, and inspire new research topics. RP SARPKAYA, T (reprint author), USN,POSTGRAD SCH,MONTEREY,CA 93943, USA. NR 96 TC 16 Z9 16 U1 1 U2 4 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 SEP PY 1992 VL 114 IS 3 BP 283 EP 298 DI 10.1115/1.2910029 PG 16 WC Engineering, Mechanical SC Engineering GA JQ405 UT WOS:A1992JQ40500003 ER PT J AU KEITH, WL HURDIS, DA ABRAHAM, BM AF KEITH, WL HURDIS, DA ABRAHAM, BM TI A COMPARISON OF TURBULENT BOUNDARY-LAYER WALL-PRESSURE SPECTRA SO JOURNAL OF FLUIDS ENGINEERING-TRANSACTIONS OF THE ASME LA English DT Article ID FLUCTUATIONS AB Turbulent boundary layer wall-pressure spectra from various experimental investigations and a recent numerical simulation are presented. The spectra are compared in nondimensional form with three commonly used scaling laws. Attenuations resulting from inadequate sensor spatial resolution are shown to be of primary importance at the higher frequencies. The dependence of the scaling laws on momentum thickness Reynolds number is discussed. The ratio of the outer to the inner boundary layer length scale is shown to provide insight into the observed trends in the spectra. RP KEITH, WL (reprint author), USN,UNDERSEAS WARFARE CTR DETACHMENT,DEPT SUBMARINE SONAR,NEW LONDON,CT 06320, USA. NR 19 TC 66 Z9 67 U1 1 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 SEP PY 1992 VL 114 IS 3 BP 338 EP 347 DI 10.1115/1.2910035 PG 10 WC Engineering, Mechanical SC Engineering GA JQ405 UT WOS:A1992JQ40500009 ER PT J AU FUJITA, S PATEL, VL AF FUJITA, S PATEL, VL TI EIGENMODE ANALYSIS OF COUPLED MAGNETOHYDRODYNAMIC OSCILLATIONS IN THE MAGNETOSPHERE SO JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS LA English DT Article ID FIELD-LINE RESONANCES; PERIOD MAGNETIC PULSATIONS; ULF WAVES; IMPULSIVE EXCITATION; DIPOLE MAGNETOSPHERE; MAGNETOPAUSE; MODEL; CAVITY AB We have performed an eigenmode analysis of the coupled magnetohydrodynamic oscillations in the magnetosphere with a dipole magnetic field. To understand the behavior of the spatial structure of the field perturbations with a great accuracy, we use the finite element method. The azimuthal and radial electric field perturbations are assumed to vanish at the ionosphere, and the azimuthal electric field is assumed to be zero on the outer boundary. The global structures of the electromagnetic field perturbations associated with the coupled magnetohydrodynamic oscillations are presented. In addition, the three-dimensional current system associated with the coupled oscillations is numerically calculated and the following characteristics are found: (1) A strong field-aligned current flows along a resonant field line. The current is particularly strong near the ionosphere. (2) The radial current changes its direction on the opposite sides of the resonant L shell. Unlike the field-aligned current, the radial currents exist in the entire magnetosphere. (3) Although the azimuthal and radial currents are intense on the resonant field line, these currents do not form a loop in the plane perpendicular to the ambient magnetic field. Therefore the field-aligned component of the perturbed magnetic field does not have a maximum at the resonant L shell. C1 USN,RES LAB,DIV PLASMA PHYS,WASHINGTON,DC 20375. RP FUJITA, S (reprint author), METEOROL COLL,KASHIWA,CHIBA 277,JAPAN. NR 36 TC 19 Z9 19 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 SEP 1 PY 1992 VL 97 IS A9 BP 13777 EP 13788 DI 10.1029/92JA00969 PG 12 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA JM026 UT WOS:A1992JM02600009 ER PT J AU SWAMINATHAN, R WAGNER, DK AF SWAMINATHAN, R WAGNER, DK TI VERTEX 2-ISOMORPHISM SO JOURNAL OF GRAPH THEORY LA English DT Article AB Whitney's theorem on 2-isomorphism characterizes the set of graphs having the same cycles as a given graph, where a cycle is regarded as a set of edges. In this paper, vertex 2-isomorphism is defined and used to prove a vertex analogue of Whitney's theorem. The main theorem states that two connected graphs have the same set of cycles, where a cycle is now regarded as a set of vertices, if and only if one can be obtained from the other by a sequence of simple operations. C1 OFF NAVAL RES,DIV MATH SCI,ARLINGTON,VA 22217. RP SWAMINATHAN, R (reprint author), UNIV CINCINNATI,DEPT COMP SCI,CINCINNATI,OH 45221, USA. NR 4 TC 2 Z9 2 U1 0 U2 0 PU JOHN WILEY & SONS INC PI NEW YORK PA 605 THIRD AVE, NEW YORK, NY 10158-0012 SN 0364-9024 J9 J GRAPH THEOR JI J. Graph Theory PD SEP PY 1992 VL 16 IS 4 BP 335 EP 347 DI 10.1002/jgt.3190160407 PG 13 WC Mathematics SC Mathematics GA JJ218 UT WOS:A1992JJ21800006 ER PT J AU ISENBERG, MT AF ISENBERG, MT TI TO EVERY THING A SEASON - SHIBE PARK AND URBAN PHILADELPHIA, 1909-1976 - KUKLICK,B SO JOURNAL OF INTERDISCIPLINARY HISTORY LA English DT Book Review RP ISENBERG, MT (reprint author), USN ACAD,ANNAPOLIS,MD 21402, 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 FAL PY 1992 VL 23 IS 2 BP 416 EP 418 DI 10.2307/205339 PG 3 WC History SC History GA JK320 UT WOS:A1992JK32000068 ER PT J AU MOLNAR, B AF MOLNAR, B TI OBSERVATIONS ON THE ELECTRICAL CHARACTERIZATION OF THE HETEROEPITAXIALLY GROWN CUBIC SIC SO JOURNAL OF MATERIALS RESEARCH LA English DT Article ID CHEMICAL-VAPOR-DEPOSITION; TEMPERATURE-DEPENDENCE; THIN-FILMS; PHOTOLUMINESCENCE; DIODES AB This paper deals with the electrical characterization of thin layers of cubic SiC, grown on (100) Si substrates. The resistivity and Hall coefficient for undoped SiC layers were measured between 10 K and 500 K. The influence of inhomogeneities on the electrical properties of the as-grown films has been established. The Hall data show a clear sign of a transition to impurity band conduction. The donor concentrations studied are in the "intermediate" range. The donor activation energy has been shown to decrease with increasing nitrogen concentration. The nitrogen concentration was measured by SIMS. The variation in nitrogen concentration is also seen in changes in the shape of the ESR spectrum. The presence of nitrogen in the intermediate concentration range is the most likely reason for the conflicting values reported for the donor ionization energy as measured by Hall and PL measurements. RP USN, RES LAB, WASHINGTON, DC 20375 USA. NR 46 TC 5 Z9 5 U1 0 U2 2 PU CAMBRIDGE UNIV PRESS PI NEW YORK PA 32 AVENUE OF THE AMERICAS, NEW YORK, NY 10013-2473 USA SN 0884-2914 EI 2044-5326 J9 J MATER RES JI J. Mater. Res. PD SEP PY 1992 VL 7 IS 9 BP 2465 EP 2477 DI 10.1557/JMR.1992.2465 PG 13 WC Materials Science, Multidisciplinary SC Materials Science GA JM355 UT WOS:A1992JM35500024 ER PT J AU WIGNALL, FS HYAMS, KC PHILLIPS, IA ESCAMILLA, J TEJADA, A LI, O LOPEZ, F CHAUCA, G SANCHEZ, S ROBERTS, CR AF WIGNALL, FS HYAMS, KC PHILLIPS, IA ESCAMILLA, J TEJADA, A LI, O LOPEZ, F CHAUCA, G SANCHEZ, S ROBERTS, CR TI SEXUAL TRANSMISSION OF HUMAN T-LYMPHOTROPIC VIRUS TYPE-I IN PERUVIAN PROSTITUTES SO JOURNAL OF MEDICAL VIROLOGY LA English DT Article DE RETROVIRAL INFECTIONS; SEXUALLY TRANSMITTED DISEASE; PERU; HTLV-I ID CELL LEUKEMIA-VIRUS; TROPICAL SPASTIC PARAPARESIS; HUMAN IMMUNODEFICIENCY VIRUS; HTLV-I; FEMALE PROSTITUTES; ANTIBODIES; INFECTION; RISK; SEROPREVALENCE; PREVALENCE AB The epidemiology of HTLV-1 infection in female prostitutes was studied in a survey of 395 prostitutes from Callao, Peru (the port city of Lima), 72 prostitutes from Iquitos, Peru (another port city on the Amazon River), and 510 prenatal clinic patients from Lima. Prostitutes reported a mean of 8.8 years (range, 1-39 years) of active prostitution and a mean of 205 sexual contacts during the month prior to the study. The percentage of prostitutes with HTLV-I antibody (21.8%) was significantly higher than patients attending a prenatal clinic (3.1%; P < .0001). The prevalence of HTLV-I antibody increased steadily with age in prostitutes, but no age trend was noted in prenatal patients. By multiple logistic regression analysis, an independent association was found between HTLV-I seropositivity and a history of prostitution in Callao, age, and positive syphilis serology when all 977 study subjects were evaluated. When prostitutes alone were analyzed, the number of years of exposure as a practicing prostitute was associated with HTLV-I seropositivity after controlling for age. These data indicate a greatly increased risk of HTLV-I infection in prostitutes in Callao, Peru, and suggest an association between sexual activity and HTLV-I transmission. C1 USN,MED RES INST DETACHMENT,APO,MIAMI,FL. USN,MED RES INST,BETHESDA,MD 20814. WALTER REED ARMY MED CTR,SILVER SPRING,MD. SERV VENEREAS CALLAO,LIMA,PERU. UNIV NACL MAYOR SAN MARCOS,LIMA,PERU. MINIST SALUD,HOSP MATERNO INFANTIL SAN BARTOLOME,LIMA,PERU. NR 25 TC 29 Z9 31 U1 0 U2 1 PU WILEY-LISS PI NEW YORK PA DIV JOHN WILEY & SONS INC 605 THIRD AVE, NEW YORK, NY 10158-0012 SN 0146-6615 J9 J MED VIROL JI J. Med. Virol. PD SEP PY 1992 VL 38 IS 1 BP 44 EP 48 DI 10.1002/jmv.1890380110 PG 5 WC Virology SC Virology GA JK555 UT WOS:A1992JK55500009 PM 1402830 ER PT J AU KAISER, D AF KAISER, D TI WAR TO SECURE PEACE - GERMAN CAMPAIGN OF THE BRITISH GOVERNMENT DURING WORLD-WAR-II - GERMAN - KETTENACKER,L SO JOURNAL OF MODERN HISTORY LA German DT Book Review RP KAISER, D (reprint author), USN,COLL WAR,WASHINGTON,DC 20350, USA. NR 1 TC 0 Z9 0 U1 0 U2 0 PU UNIV CHICAGO PRESS PI CHICAGO PA 5720 S WOODLAWN AVE, CHICAGO, IL 60637 SN 0022-2801 J9 J MOD HIST JI J. Mod. Hist. PD SEP PY 1992 VL 64 IS 3 BP 588 EP 590 DI 10.1086/244522 PG 3 WC History SC History GA JM043 UT WOS:A1992JM04300013 ER PT J AU JEWELL, JM AF JEWELL, JM TI MODEL FOR THE THERMOOPTIC BEHAVIOR OF SODIUM-BORATE AND SODIUM ALUMINOSILICATE GLASSES SO JOURNAL OF NON-CRYSTALLINE SOLIDS LA English DT Article ID COEFFICIENTS AB The thermo-optic coefficients (dn/dT) of Na2O-B2O3 and 25Na2O-xAl2O3-(75-x)SiO2 glasses have been measured. The effect of glass composition on the dn/dT of these two sets of glasses is similar to the effects ot composition on other glass properties. Prod'homme's theory for thermal change of refractive indeX is sufficient to explain the effects of composition on the dn/dT in terms of the relative contributions of the thermal expansion coefficient and the temperature coefficient of the electronic polarizability. However, the temperature coefficient of the electronic polarizability is not proportional to the activation energy for viscous flow as suggested by Prod'homme. A model is proposed which explains the effect of composition on the temperature coefficient electronic polarizability in terms of the relative volume occupied by various types of bridging and non-bridging oxygen ions in the glass. This relationship is the result of the dependence of the electronic polarizability coefficient of various types of oxygen on the bonding associated with each oxygen ion species. RP JEWELL, JM (reprint author), USN,RES LAB,DIV OPT SCI,OPT MAT RES GRP,CODE 6505,WASHINGTON,DC 20375, USA. NR 22 TC 26 Z9 26 U1 0 U2 9 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 SEP PY 1992 VL 146 IS 2-3 BP 145 EP 153 DI 10.1016/S0022-3093(05)80486-7 PG 9 WC Materials Science, Ceramics; Materials Science, Multidisciplinary SC Materials Science GA JQ465 UT WOS:A1992JQ46500006 ER PT J AU CLINARD, FW FARNUM, EH GRISCOM, DL MATTAS, RF MEDLEY, SS WIFFEN, FW WOJTOWICZ, SS YOUNG, KM ZINKLE, SJ AF CLINARD, FW FARNUM, EH GRISCOM, DL MATTAS, RF MEDLEY, SS WIFFEN, FW WOJTOWICZ, SS YOUNG, KM ZINKLE, SJ TI MATERIALS ISSUES IN DIAGNOSTIC SYSTEMS FOR BPX AND ITER SO JOURNAL OF NUCLEAR MATERIALS LA English DT Article; Proceedings Paper CT 5TH INTERNATIONAL CONF ON FUSION REACTOR MATERIALS ( ICFRM-5 ) CY NOV 17-22, 1991 CL CLEARWATER, FL ID RADIATION; SILICA; IRRADIATION; ABSORPTION; DEFECT; DAMAGE; GLASS; SIO2 AB Diagnostic systems in advanced D-T-burning fusion devices will be subjected to intense fluxes and fluences of high-energy neutrons and gamma rays. Materials used in these systems may suffer significant degradation of structural, optical, and electrical properties, either promptly upon irradiation or after accumulation of structural damage. Of particular concern are windows, optical fibers, reflectors, and insulators. Many materials currently specified for these components are known to degrade under anticipated operating conditions. However, materials selection and modification based on results from an appropriate irradiation testing program, when combined with design optimization for location, shielding, and ease of replacement, should point the way to development of acceptable systems. C1 USN,RES LAB,WASHINGTON,DC 20375. ARGONNE NATL LAB,ARGONNE,IL 60439. PRINCETON PLASMA PHYS LAB,PRINCETON,NJ 08543. US DOE,WASHINGTON,DC 20585. GEN ATOM CO,SAN DIEGO,CA 92186. OAK RIDGE NATL LAB,OAK RIDGE,TN 37831. RP CLINARD, FW (reprint author), LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87544, USA. OI Zinkle, Steven/0000-0003-2890-6915 NR 30 TC 19 Z9 19 U1 0 U2 2 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0022-3115 J9 J NUCL MATER JI J. Nucl. Mater. PD SEP PY 1992 VL 191 BP 1399 EP 1403 DI 10.1016/0022-3115(92)90705-P PN B PG 5 WC Materials Science, Multidisciplinary; Nuclear Science & Technology SC Materials Science; Nuclear Science & Technology GA JY947 UT WOS:A1992JY94700153 ER PT J AU BRENNAN, WD HOVLAND, DL NETZER, DW AF BRENNAN, WD HOVLAND, DL NETZER, DW TI MEASURED PARTICULATE BEHAVIOR IN A SUBSCALE SOLID-PROPELLANT ROCKET MOTOR SO JOURNAL OF PROPULSION AND POWER LA English DT Article AB Particle size distributions were measured in the combustion chamber, exhaust nozzle, and exhaust plume of a small, two-dimensional rocket motor that utilized aluminized propellants. Various nozzle contours and pressures to 4.36 MPa were utilized. For pressures less than approximately 2.4 MPa, D32 of the multimodal size distributions entering the nozzle decreased with increasing pressure. Above 2.4 MPa, the higher propellant burning rates significantly reduced particle agglomeration and increased C* efficiency. At higher pressures, D32 entering the nozzle was quite small (2-6-mu) and monomodal, and did not vary appreciably with pressure. During tailoff, D32 was significantly larger than during the steady burn, indicating another possible source for plume signature variations. Exhaust particle D32 was 1.2-1.6-mu (with a <2, 8, 28-mu trimodal distribution), independent of pressure, nozzle inlet contour, exit Mach number, degree of underexpansion, or location aft of the exit plane. The existence of a small number of larger particles indicated that either particle collision and/or surface effects occurred in the nozzle convergence, or that the larger particles at the nozzle entrance were concentrated near the wall, out of the viewing volume in the center of the flow. RP BRENNAN, WD (reprint author), USN,POSTGRAD SCH,DEPT AERONAUT & ASTRONAUT,MONTEREY,CA 93943, USA. NR 20 TC 5 Z9 6 U1 0 U2 1 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 SEP-OCT PY 1992 VL 8 IS 5 BP 954 EP 960 DI 10.2514/3.23578 PG 7 WC Engineering, Aerospace SC Engineering GA JM028 UT WOS:A1992JM02800006 ER PT J AU VAUGHT, C WITT, M NETZER, D GANY, A AF VAUGHT, C WITT, M NETZER, D GANY, A TI INVESTIGATION OF SOLID-FUEL, DUAL-MODE COMBUSTION RAMJETS SO JOURNAL OF PROPULSION AND POWER LA English DT Article AB An investigation was conducted to determine the feasibility of using a solid-fuel, dual-combustion mode ramjet (DMRJ) for hypersonic vehicles (e.g., tactical missiles) operating at a design point of Mach 6 and an altitude of 24.4 km. The analysis showed that, with a supersonic combustion efficiency of 90%, the DMRJ can exceed the performance of the solid-fuel ramjet (SFRJ) by as much as 20% at near stoichiometric fuel-to-air ratios, neglecting heat and wall shear losses in the supersonic combustor. It also seems that the combustion efficiency must be greater than 70% in order for the DMRJ to outperform the conventional SFRJ at the chosen design point. Chemical kinetics considerations revealed that the dual-mode configuration enables the efficient use of solid hydrocarbon fuels due to the existence of highly reactive species in the supersonic combustor, after the completion of the initial slow reaction stages in the subsonic gas generator. Preliminary laboratory tests demonstrated the operation of such a DMRJ system, including the establishment of sustained combustion in the supersonic chamber. C1 TECHNION ISRAEL INST TECHNOL,DEPT AERONAUT & ASTRONAUT,IL-34406 HAIFA,ISRAEL. RP VAUGHT, C (reprint author), USN,POSTGRAD SCH,MONTEREY,CA 93943, USA. NR 20 TC 8 Z9 14 U1 1 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 SEP-OCT PY 1992 VL 8 IS 5 BP 1004 EP 1011 DI 10.2514/3.23585 PG 8 WC Engineering, Aerospace SC Engineering GA JM028 UT WOS:A1992JM02800013 ER PT J AU CHAUHAN, SP RUTHERFORD, SE HESS, LW MORRISON, JC AF CHAUHAN, SP RUTHERFORD, SE HESS, LW MORRISON, JC TI PROPHYLACTIC INTRAPARTUM AMNIOINFUSION FOR PATIENTS WITH OLIGOHYDRAMNIOS - A PROSPECTIVE RANDOMIZED STUDY SO JOURNAL OF REPRODUCTIVE MEDICINE LA English DT Article ID AMNIOTIC-FLUID VOLUME; FETAL HEART-RATE; DISTRESS; PREDICTORS; PREGNANCY AB This prospective study evaluated whether prophylactic saline amnioinfusion among patients with amniotic fluid index (AFI) less-than-or-equal-to 5.0 cm decreases the incidence of adverse fetal outcomes. Randomization of 53 patients with decreased AFI at term, resulted in 21 patients' receiving prophylactic saline amnioinfusion early in labor, prior to development of an abnormal fetal heart rate tracing. For the treatment group the mean AFI on admission was 3.0 cm, and the postamnioinfusion AFI was 8.9 cm. For 32 comparison (noninfusion) patients, the mean AFI was 2.9 cm; the group consisted of 17 patients randomized to receive no amnioinfusion (control group) and 15 patients who refused to participate in the study. There was no statistically significant difference between the amnioinfused and nonamnioinfused patients with regard to age, parity, gestational age, AFI at admission or duration of first or second stage of labor. Amnioinfusion resulted in no statistically significant reduction in the incidence of recurrent variable decelerations/bradycardia (26.3% vs. 46.6%), intrapartum resuscitation with terbutaline (5.2% vs. 10.0%), cesarean section for fetal distress (9.5% vs. 9.3%), fetal acidosis (10.5% vs. 12.0%) or Apgar scores <7 at five minutes (5.2% vs. 0%) in patients with oligohydramnios. C1 USN HOSP,DEPT OBSTET & GYNECOL,JACKSON,MS. RP CHAUHAN, SP (reprint author), UNIV MISSISSIPPI,MED CTR,DEPT OBSTET & GYNECOL,2500 N STATE ST,JACKSON,MS 39216, USA. NR 8 TC 22 Z9 22 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 SEP PY 1992 VL 37 IS 9 BP 817 EP 820 PG 4 WC Obstetrics & Gynecology SC Obstetrics & Gynecology GA JN990 UT WOS:A1992JN99000012 PM 1453405 ER PT J AU SAYERS, ME CHOU, SM CALABRESE, LH AF SAYERS, ME CHOU, SM CALABRESE, LH TI INCLUSION BODY MYOSITIS - ANALYSIS OF 32 CASES SO JOURNAL OF RHEUMATOLOGY LA English DT Article DE MYOSITIS; INCLUSION BODY MYOSITIS; MYOPATHY ID IDIOPATHIC INFLAMMATORY MYOPATHY; POLYMYOSITIS; NEUROPATHY AB Inclusion body myositis is characterized by an insidious onset, progressive indolent course, and is generally felt to be refractory to standard therapy for myositis. We reviewed the charts of 32 patients with muscle biopsy findings suggestive of inclusion body myositis. The average time from symptom onset to diagnosis was 37 months, but initially 40% were incorrectly diagnosed. Twenty-eight patients (88%) were classified as definite or probable inclusion body myositis and were treated with various combinations of prednisone and immuno-suppressive agents. Sixty-eight percent of those treated experienced a decrement in function and muscle strength. Three patients exhibited longterm improvement while 12 patients experienced delayed progression, defined by short term improvement in strength or a stable functional class, All of these patients received therapy, 5 in the form of methotrexate and prednisone. All untreated patients deteriorated clinically. In summary, (1) inclusion body myositis is a clinically distinct entity which is frequently misdiagnosed initially. (2) While clinical improvement with therapy is rare, our observations support recent reports that therapy may be associated with a slower rate of clinical progression. (3) Optimal therapy remains uncertain, but the use of low dose methotrexate and prednisone may warrant further study. C1 CLEVELAND CLIN FDN,DEPT RHEUMAT & IMMUNOL DIS,CLIN IMMUNOL SECT,A5O,9500 EUCLID AVE,CLEVELAND,OH 44195. CLEVELAND CLIN EDUC FDN,DEPT PATHOL,CLEVELAND,OH 44106. USN HOSP,DIV RHEUMATOL,PORTSMOUTH,VA. NR 19 TC 76 Z9 76 U1 0 U2 0 PU J RHEUMATOL PUBL CO PI TORONTO PA 920 YONGE ST, SUITE 115, TORONTO ON M4W 3C7, CANADA SN 0315-162X J9 J RHEUMATOL JI J. Rheumatol. PD SEP PY 1992 VL 19 IS 9 BP 1385 EP 1389 PG 5 WC Rheumatology SC Rheumatology GA JN269 UT WOS:A1992JN26900014 PM 1331441 ER PT J AU PAPOULIAS, FA AF PAPOULIAS, FA TI STABILITY AND BIFURCATIONS OF TOWED UNDERWATER VEHICLES IN THE DIVE PLANE SO JOURNAL OF SHIP RESEARCH LA English DT Article AB The problem of static and dynamic loss of stability in the vertical plane in steady towing of underwater vehicles is considered. Bifurcations of steady-state equilibria are studied using singularity theory techniques and all qualitatively different bifurcation diagrams that occur locally are revealed. Analytical conditions for stability of straight-line motion are derived. Bifurcations to periodic solutions are analyzed and shown to provide paths to complicated dynamics. The incorporation of the techniques used in this work, with related studies in cable dynamics, can lead to a design methodology for safer and more efficient operations. RP PAPOULIAS, FA (reprint author), USN,POSTGRAD SCH,DEPT MECH ENGN,MONTEREY,CA 93940, USA. NR 0 TC 0 Z9 2 U1 0 U2 0 PU SOC NAVAL ARCH MARINE ENG PI JERSEY CITY PA 601 PAVONIA AVENUE, JERSEY CITY, NJ 07306 SN 0022-4502 J9 J SHIP RES JI J. Ship Res. PD SEP PY 1992 VL 36 IS 3 BP 255 EP 267 PG 13 WC Engineering, Marine; Engineering, Civil SC Engineering GA JP651 UT WOS:A1992JP65100006 ER PT J AU LOONEY, RE AF LOONEY, RE TI THE GULF WAR AND THE PRICE OF OIL - PROSPECTS FOR THE MEDIUM TERM SO JOURNAL OF SOCIAL POLITICAL AND ECONOMIC STUDIES LA English DT Article RP LOONEY, RE (reprint author), USN,POSTGRAD SCH,MONTEREY,CA 93940, USA. NR 33 TC 0 Z9 0 U1 0 U2 0 PU COUNCIL SOCIAL & ECON STUDIES PI WASHINGTON PA C/O EDITOR PO BOX 34070 NW, WASHINGTON, DC 20043 SN 0278-839X J9 J SOC POLIT ECON ST JI J. Soc. Polit. Econ. Stud. PD FAL-WIN PY 1992 VL 17 IS 3-4 BP 273 EP 301 PG 29 WC Social Sciences, Interdisciplinary SC Social Sciences - Other Topics GA KG260 UT WOS:A1992KG26000002 ER PT J AU PIQUETTE, JC AF PIQUETTE, JC TI METHOD FOR TRANSDUCER TRANSIENT SUPPRESSION .1. THEORY SO JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA LA English DT Article AB The problem of driving a transducer in such a way as to produce a tone burst of steady-state sound radiation in the surrounding fluid medium is considered. The goal is to determine the driving voltage waveform to apply to a transducer to produce an acoustic pressure waveform in the fluid that is a segment of a steady-state sine wave, beginning and ending at zero crossings of the sine, i.e., the usual turnon and turnoff transients are suppressed. The theoretical driving voltage waveform for a spherical transducer is shown to consist of a sum of a pedestal voltage, a ramp voltage, and a sinusoidal voltage that is phase shifted with respect to the sinusoid appearing in the fluid. Both theoretical and numerical calculations are given here. The following paper presents results of experimental measurements. The measurements were carried out on several spherical transducers (one of which was selected for presentation) and on an array of piezoelectric tubes. These experiments confirm the validity of the theory. RP PIQUETTE, JC (reprint author), USN,RES LAB,UNDERWATER SOUND REFERENCE DETACHMENT,POB 568337,ORLANDO,FL 32856, USA. NR 10 TC 15 Z9 18 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 SEP PY 1992 VL 92 IS 3 BP 1203 EP 1213 DI 10.1121/1.403970 PG 11 WC Acoustics; Audiology & Speech-Language Pathology SC Acoustics; Audiology & Speech-Language Pathology GA JM605 UT WOS:A1992JM60500001 ER PT J AU PIQUETTE, JC AF PIQUETTE, JC TI METHOD FOR TRANSDUCER TRANSIENT SUPPRESSION .2. EXPERIMENT SO JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA LA English DT Article ID LEAST-SQUARES ALGORITHM AB Results of experiments that were conducted to investigate the validity of the theory presented in the preceding paper are given. The method was applied to a number of spherical piezoelectric sources, one of which was selected for presentation here, and to a source consisting of an array of piezoelectric tubes. A high degree of transient suppression was realized. RP PIQUETTE, JC (reprint author), USN,RES LAB,UNDERWATER SOUND REFERENCE DETACHMENT,POB 568337,ORLANDO,FL 32856, USA. NR 8 TC 13 Z9 15 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 SEP PY 1992 VL 92 IS 3 BP 1214 EP 1221 DI 10.1121/1.403971 PG 8 WC Acoustics; Audiology & Speech-Language Pathology SC Acoustics; Audiology & Speech-Language Pathology GA JM605 UT WOS:A1992JM60500002 ER PT J AU BRILL, RL PAWLOSKI, JL HELWEG, DA AU, WW MOORE, PWB AF BRILL, RL PAWLOSKI, JL HELWEG, DA AU, WW MOORE, PWB TI TARGET DETECTION, SHAPE-DISCRIMINATION, AND SIGNAL CHARACTERISTICS OF AN ECHOLOCATING FALSE KILLER WHALE (PSEUDORCA-CRASSIDENS) SO JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA LA English DT Article ID DOLPHIN TURSIOPS-TRUNCATUS AB This study demonstrated the ability of a false killer whale (Pseudorca crassidens) to discriminate between two targets and investigated the parameters of the whale's emitted signals for changes related to test conditions. Target detection performance comparable to the bottlenose dolphin's (Tursiops truncatus) has previously been reported for echolocating false killer whales. No other echolocation capabilities have been reported. A false killer whale, naive to conditioned echolocation tasks, was initially trained to detect a cylinder in a "go/no-go" procedure over ranges of 3 to 8 m. The transition from a detection task to a discrimination task was readily achieved by introducing a spherical comparison target. Finally, the cylinder was successfully compared to spheres of two different sizes and target strengths. Multivariate analyses were used to evaluate the parameters of emitted signals. Duncan's multiple range tests showed significant decreases (df = 185, p < 0.05) in both source level and bandwidth in the transition from detection to discrimination. Analysis of variance revealed a significant decrease in the number of clicks over test conditions [F(5,26) = 5.23, p < 0.0001]. These data suggest that the whale relied on cues relevant to target shape as well as target strength, that changes in source level and bandwidth were task-related, that the decrease in clicks was associated with learning experience, and that Pseudorca's ability to discriminate shapes using echolocation may be comparable to that of Tursiops truncatus. RP BRILL, RL (reprint author), USN,CTR OCEAN SYST,POB 997,KAILUA,HI 96734, USA. NR 18 TC 12 Z9 12 U1 1 U2 6 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0001-4966 J9 J ACOUST SOC AM JI J. Acoust. Soc. Am. PD SEP PY 1992 VL 92 IS 3 BP 1324 EP 1330 DI 10.1121/1.403926 PG 7 WC Acoustics; Audiology & Speech-Language Pathology SC Acoustics; Audiology & Speech-Language Pathology GA JM605 UT WOS:A1992JM60500011 PM 1401519 ER PT J AU LOURTIE, IMG CARTER, GC AF LOURTIE, IMG CARTER, GC TI SIGNAL DETECTORS FOR RANDOM OCEAN MEDIA SO JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA LA English DT Article ID MULTIPATH AB This paper reports on acoustic signal detection in a stationary random multipath environment. The multipath transmission channel is modeled considering that both multipath time delay and attenuation coefficients characterizing the emitter/receiver transfer function are random variables with an a priori given distribution. Under the above condition, and assuming the signal-to-noise ratio (SNR) is either low or high, the likelihood ratio (LR) detector structure is developed, analyzed, and interpreted. A Monte Carlo study is also carried out. For low SNR conditions, the statistical behavior of the achieved processor is evaluated and compared to that of two classical detectors: (i) the standard detector derived based on a presumed known multipath channel structure, and (ii) the ad hoc detector developed for inaccurate multipath time delay modeling assumptions. C1 USN, CTR UNDERWATER SYST, NEW LONDON DETACHMENT, NEW LONDON, CT 06320 USA. RP LOURTIE, IMG (reprint author), Univ Tecn Lisboa, CAPS COMPLEXO, INST SUPER TECN, AV ROVISCO PAIS, P-1096 LISBON, PORTUGAL. RI Lourtie, Isabel/B-5258-2016 OI Lourtie, Isabel/0000-0002-5852-2595 NR 17 TC 7 Z9 7 U1 0 U2 0 PU ACOUSTICAL SOC AMER AMER INST PHYSICS PI MELVILLE PA STE 1 NO 1, 2 HUNTINGTON QUADRANGLE, MELVILLE, NY 11747-4502 USA SN 0001-4966 J9 J ACOUST SOC AM JI J. Acoust. Soc. Am. PD SEP PY 1992 VL 92 IS 3 BP 1420 EP 1427 DI 10.1121/1.403936 PG 8 WC Acoustics; Audiology & Speech-Language Pathology SC Acoustics; Audiology & Speech-Language Pathology GA JM605 UT WOS:A1992JM60500021 ER PT J AU MEDWIN, H NYSTUEN, JA JACOBUS, PW OSTWALD, LH SNYDER, DE AF MEDWIN, H NYSTUEN, JA JACOBUS, PW OSTWALD, LH SNYDER, DE TI THE ANATOMY OF UNDERWATER RAIN NOISE SO JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA LA English DT Article ID DROP IMPACTS; SOUND; RAINDROPS; SURFACE; PRECIPITATION; OSCILLATIONS; BUBBLES; WIND AB When rain falls onto a large body of water it produces dominating underwater sound over a broad range of audio frequencies. Laboratory studies using more than 1000 single drops, covering the complete size range of actual rain drops at their terminal speeds, have now shown that the complete underwater spectrum of rainfall sound can be dissected into the impact and microbubble sounds produced by four acoustically distinctive ranges of drop diameters D. These are defined as "minuscule" drops (D less-than-or-equal-to 0.8 mm), "small" drops (0.8 mm less-than-or-equal-to D less-than-or-equal-to 1.1 mm), "mid-size" drops (1.1 less-than-or-equal-to D less-than-or-equal-to 2.2 mm), and "large" drops (D greater-than-or-equal-to 2.2 mm). A minuscule raindrop produces only a very weak, almost undetectable, short duration impact noise. A small drop at terminal speed and at local, near-normal incidence, radiates measurable broadband impact sound followed by the very much stronger sound of a "type I" damped microbubble oscillating at frequencies near 15 kHz. A mid-size raindrop radiates only impact sound. Large raindrops, which comprise the major volume of moderate to heavy rainfall, produce an impact sound and a dominating, "type II," "primary" oscillating microbubble of characteristic frequency 2 to 10 kHz depending on the drop diameter. Also, large drops often generate weaker sounds from "secondary" bubbles. The average acoustic energy spectra of large raindrops are distinctive functions of their diameters, the salinity of the surface water, and the temperature difference between the drop and the surface water. When the underwater acoustic intensity spectrum during heavy rain is calculated from the single drop acoustic energy spectra and the drop size distribution, it compares quite well with ocean measurements. The gas injection at the air-water interface is calculated from the probability of bubble formation during a heavy rainfall. C1 USN,POSTGRAD SCH,DEPT OCEANOG,MONTEREY,CA 93943. RP MEDWIN, H (reprint author), USN,POSTGRAD SCH,DEPT PHYS,MONTEREY,CA 93943, USA. NR 43 TC 59 Z9 62 U1 4 U2 14 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 SEP PY 1992 VL 92 IS 3 BP 1613 EP 1623 DI 10.1121/1.403902 PG 11 WC Acoustics; Audiology & Speech-Language Pathology SC Acoustics; Audiology & Speech-Language Pathology GA JM605 UT WOS:A1992JM60500040 ER PT J AU HIPPENSTIEL, R CHAULK, E MILLER, JH AF HIPPENSTIEL, R CHAULK, E MILLER, JH TI AN ADAPTIVE TRACKER FOR PARTIALLY RESOLVED ACOUSTIC ARRIVALS WITH APPLICATION TO OCEAN ACOUSTIC TOMOGRAPHY SO JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA LA English DT Letter AB Tracking the arrival time of identifiable, stable, and resolvable signals has been essential for ocean acoustic tomography. Resolvability is usually attained by having the separation between successive multi-path/mode arrivals be greater than the digit duration of a phase-encoded signal. An unresolved ray or mode can cause a local maxima in the correlator receiver output at a time corresponding to its arrival time. As the phase code is repeated and if these maxima occur often enough, the arrival may then be considered partially resolved and may be tracked. Here an application of the Widrow-Hoff least-mean-squares adaptive algorithm to the tracking of partially resolved mode arrivals measured in an acoustic tomography experiment carried out in Monterey Bay in 1988 is described. RP HIPPENSTIEL, R (reprint author), USN,POSTGRAD SCH,DEPT ELECT & COMP ENGN,MONTEREY,CA 93943, USA. OI Miller, James H./0000-0001-7156-3589 NR 9 TC 3 Z9 3 U1 0 U2 0 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0001-4966 J9 J ACOUST SOC AM JI J. Acoust. Soc. Am. PD SEP PY 1992 VL 92 IS 3 BP 1759 EP 1762 DI 10.1121/1.403915 PG 4 WC Acoustics; Audiology & Speech-Language Pathology SC Acoustics; Audiology & Speech-Language Pathology GA JM605 UT WOS:A1992JM60500053 ER PT J AU SPRANGLE, EA ANDREWS, JM PECKERAR, MC AF SPRANGLE, EA ANDREWS, JM PECKERAR, MC TI DIELECTRIC-BREAKDOWN STRENGTH OF SIO2 USING A STEPPED-FIELD METHOD SO JOURNAL OF THE ELECTROCHEMICAL SOCIETY LA English DT Article AB The ramped-field technique has been widely used for determining dielectric breakdown in thin insulating films. But this method does not control stress time, and it is difficult to define an irreversibly broken down capacitor based solely on observations of current during stressing. A more advanced stepped-field method is described, which provides well-defined stress times and guarantees catastrophic breakdown in all cases. MOS capacitors, formed by depositing Al dots on thermally grown SiO2, were used to determine oxide breakdown. The breakdown field was found to decrease logarithmically with the stressing time. A model is presented which relates the probability of breakdown to the stressing field strength and stressing time. Dielectric breakdown strength was also investigated as a function of annealing time and temperature. Annealing at 500-degrees-C and above for 1 h in H-2 caused the breakdown strength of the oxide to be sharply reduced due to a metallurgical reaction between Al and SiO2. C1 USN,RES LAB,NANOELECTR PROC FACIL,WASHINGTON,DC 20375. RP SPRANGLE, EA (reprint author), CORNELL UNIV,SCH ELECT ENGN,ITHACA,NY 14853, USA. NR 9 TC 1 Z9 1 U1 1 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 SEP PY 1992 VL 139 IS 9 BP 2617 EP 2620 DI 10.1149/1.2221274 PG 4 WC Electrochemistry; Materials Science, Coatings & Films SC Electrochemistry; Materials Science GA JL825 UT WOS:A1992JL82500051 ER PT J AU ZYBURA, MF JONES, SH PAPANICOLAOU, NA ANDERSON, WT AF ZYBURA, MF JONES, SH PAPANICOLAOU, NA ANDERSON, WT TI HIGH SELECTIVITY PATTERNED SUBSTRATE EPITAXY OF INXGA1-XAS/GAAS(0-LESS-THAN-OR-EQUAL-TO-X-LESS-THAN-OR-EQUAL-TO-1) BY CONVENTIONAL LPOMVPE SO JOURNAL OF THE ELECTROCHEMICAL SOCIETY LA English DT Letter ID VAPOR-PHASE EPITAXY; GAAS; GROWTH; PRESSURE; DEFECTS; AREA AB A study of InxGa1-xAs/GaAs (0 less-than-or-equal-to x less-than-or-equal-to 1) selective epitaxy by conventional low-pressure organometallic vapor phase epitaxy (LPOMVPE) was performed using a variety of masking materials. Very low or zero nucleation of polycrystalline (poly) GaAs, In0.7Ga0.3As, and InAs was observed on the 300-degrees-C chemical vapor deposition (CVD) SiO2, sputtered SiO2, and plasma enhanced CVD (PECVD) Si3Nx masking materials over a wide range of typical growth parameters. Dense polycrystalline nucleation was observed on TiW masks. The degree of selectivity achieved vs. mask material and InGaAs composition at relatively low LPOMVPE reaction temperatures was examined. It was repeatedly observed that during selective epitaxy, zero polycrystalline GaAs and InAs nucleation occurred on the dielectric masks using conventional LPOMVPE. High selectivity in mask areas as large as 500-mu-m x 500-mu-m was achieved without specifically using a chloride precurser, or extremely low pressure, or SiNx masks. C1 USN,RES LAB,DIV ELECTR SCI & TECHNOL,WASHINGTON,DC 20375. RP ZYBURA, MF (reprint author), UNIV VIRGINIA,DEPT ELECT ENGN,APPL ELECTROPHYS LAB,CHARLOTTESVILLE,VA 22903, USA. NR 11 TC 0 Z9 0 U1 0 U2 0 PU ELECTROCHEMICAL SOC INC PI PENNINGTON PA 10 SOUTH MAIN STREET, PENNINGTON, NJ 08534 SN 0013-4651 J9 J ELECTROCHEM SOC JI J. Electrochem. Soc. PD SEP PY 1992 VL 139 IS 9 BP L84 EP L86 DI 10.1149/1.2221291 PG 3 WC Electrochemistry; Materials Science, Coatings & Films SC Electrochemistry; Materials Science GA JL825 UT WOS:A1992JL82500006 ER PT J AU HSU, DSY TURNER, NH PIERSON, KW SHAMAMIAN, VA AF HSU, DSY TURNER, NH PIERSON, KW SHAMAMIAN, VA TI 20-NM LINEWIDTH PLATINUM PATTERN FABRICATION USING CONFORMAL EFFUSIVE-SOURCE MOLECULAR PRECURSOR DEPOSITION AND SIDEWALL LITHOGRAPHY SO JOURNAL OF VACUUM SCIENCE & TECHNOLOGY B LA English DT Article ID LINES AB In a manner suitable for large-scale processing, vertical platinum structures having thicknesses (linewidths) down to 20 nm, heights up to 700 nm, an aspect ratio up to 13, and different geometric shapes have been fabricated on top of a silicon dioxide substrate by Pt deposition from the thermal decomposition of a platinum precursor molecule under gas phase collisionless conditions followed by ion-assisted etching. Scanning electron microscopy analysis shows that the structures have very small grains, high uniformity, and very sharp contours, demonstrating a high degree of conformal deposition. Scanning Auger microscopy reveals platinum only on the structures. X-ray diffraction and x-ray photoelectron spectroscopy analysis of the as-deposited platinum film show that the platinum film is polycrystalline and has no detectable impurity. Scotch tape test shows good bonding of the film. Mass spectrometric measurements suggest that substantial amounts of stable precursor fragments from partial decomposition of the parent precursor desorb from the substrate. The observed desirable film morphology and purity can be attributed to the favorable choice of template material, decomposition mechanism of the precursor, and the chemical beam conditions used. RP HSU, DSY (reprint author), USN,RES LAB,DIV CHEM,WASHINGTON,DC 20375, USA. NR 19 TC 20 Z9 20 U1 0 U2 0 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 1071-1023 J9 J VAC SCI TECHNOL B JI J. Vac. Sci. Technol. B PD SEP-OCT PY 1992 VL 10 IS 5 BP 2251 EP 2258 DI 10.1116/1.586197 PG 8 WC Engineering, Electrical & Electronic; Nanoscience & Nanotechnology; Physics, Applied SC Engineering; Science & Technology - Other Topics; Physics GA JW294 UT WOS:A1992JW29400019 ER PT J AU JEWELL, JM SACHON, M AGGARWAL, ID AF JEWELL, JM SACHON, M AGGARWAL, ID TI H2O AND HF EVOLUTION FROM ZBLAN GLASSES SO MATERIALS LETTERS LA English DT Article ID METAL FLUORIDE GLASS AB Hydrogen containing gases which evolve from ZrF4-based heavy metal fluoride glasses during remelting were analyzed using a mass spectrometer. H2O and HF gases evolved in proportion to the initial hydroxyl concentration of the glass. One glass, which had been prepared using CCl4, evolved a comparatively large amount of HCl gas in preference to H2O. RP JEWELL, JM (reprint author), USN,RES LAB,OPT MAT RES GRP,WASHINGTON,DC 20375, USA. NR 10 TC 0 Z9 0 U1 0 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0167-577X J9 MATER LETT JI Mater. Lett. PD SEP PY 1992 VL 14 IS 5-6 BP 352 EP 354 DI 10.1016/0167-577X(92)90052-L PG 3 WC Materials Science, Multidisciplinary; Physics, Applied SC Materials Science; Physics GA JN037 UT WOS:A1992JN03700023 ER PT J AU LINENGER, JM WEST, LA AF LINENGER, JM WEST, LA TI EPIDEMIOLOGY OF SOFT-TISSUE MUSCULOSKELETAL INJURY AMONG UNITED-STATES MARINE RECRUITS UNDERGOING BASIC TRAINING SO MILITARY MEDICINE LA English DT Article AB We determined the incidence of soft-tissue/musculoskeletal injury occurring during 8,076 recruit-months at risk among recruits undergoing basic training at Marine Corps Recruit Depot, San Diego, California, between January and April 1990. We analyzed International Classification of Disease codes relating to initial visit for injuries, and calculated recruit-months from weekly strength figures. Training-related injuries occurred at a rate of 19.9 injuries per 100 recruit-months. Within the sports medicine clinic, iliotibial band syndrome [22.4%], patellar tendinitis [15.1%], and mechanical low back pain [11.4%] occurred most frequently, with rates per 100 recruit-months of 2.1, 1.4, and 1.1, respectively. RP LINENGER, JM (reprint author), USN,HLTH RES CTR,DEPT EPIDEMIOL,POB 85122,SAN DIEGO,CA 92186, USA. NR 0 TC 33 Z9 34 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 SEP PY 1992 VL 157 IS 9 BP 491 EP 493 PG 3 WC Medicine, General & Internal SC General & Internal Medicine GA JP041 UT WOS:A1992JP04100015 PM 1454197 ER PT J AU ZAJDOWICZ, TR AF ZAJDOWICZ, TR TI CHRONIC FATIGUE SYNDROME AND MILITARY SERVICE SO MILITARY MEDICINE LA English DT Letter RP ZAJDOWICZ, TR (reprint author), USN HOSP,DIV INFECT DIS,PORTSMOUTH,VA, USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU ASSN MILITARY SURG US PI BETHESDA PA 9320 OLD GEORGETOWN RD, BETHESDA, MD 20814 SN 0026-4075 J9 MIL MED JI Milit. Med. PD SEP PY 1992 VL 157 IS 9 BP A3 EP A4 PG 2 WC Medicine, General & Internal SC General & Internal Medicine GA JP041 UT WOS:A1992JP04100002 PM 1454187 ER PT J AU KANG, YH QUELLA, SE WILLIAMS, R LEE, CH AF KANG, YH QUELLA, SE WILLIAMS, R LEE, CH TI THROMBIN MODULATION OF EXPRESSION OF MATRIX PROTEINS AND RECEPTORS IN HUMAN PULMONARY-ARTERY ENDOTHELIAL-CELLS SO MOLECULAR BIOLOGY OF THE CELL LA English DT Meeting Abstract C1 USN,BETHESDA,MD 20889. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER SOC CELL BIOLOGY PI BETHESDA PA PUBL OFFICE, 9650 ROCKVILLE PIKE, BETHESDA, MD 20814 SN 1059-1524 J9 MOL BIOL CELL JI Mol. Biol. Cell PD SEP PY 1992 VL 3 SU S BP A131 EP A131 PG 1 WC Cell Biology SC Cell Biology GA JR255 UT WOS:A1992JR25500760 ER PT J AU SCHWARTZ, GN KESSLER, SW REID, T PERDUE, JF AF SCHWARTZ, GN KESSLER, SW REID, T PERDUE, JF TI IGF-II ENHANCED IL-3-INDUCED ERYTHROPOIESIS AND MYELOPOIESIS IN SUSPENSION-CULTURES OF HUMAN BONE-MARROW CELLS SO MOLECULAR BIOLOGY OF THE CELL LA English DT Meeting Abstract C1 WALTER REED ARMY MED CTR,WASHINGTON,DC 20307. AMER RED CROSS,BETHESDA,MD 20814. USN,MED RES INST,BETHESDA,MD 20814. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER SOC CELL BIOLOGY PI BETHESDA PA PUBL OFFICE, 9650 ROCKVILLE PIKE, BETHESDA, MD 20814 SN 1059-1524 J9 MOL BIOL CELL JI Mol. Biol. Cell PD SEP PY 1992 VL 3 SU S BP A142 EP A142 PG 1 WC Cell Biology SC Cell Biology GA JR255 UT WOS:A1992JR25500824 ER PT J AU STATON, AJ NIELSEN, TB AF STATON, AJ NIELSEN, TB TI THE EFFECT OF ADENOSINE (ADO) AND HYPOXANTHINE (HX) ON ENDOTHELIAL-CELL PROLIFERATION SO MOLECULAR BIOLOGY OF THE CELL LA English DT Meeting Abstract C1 USN,BETHESDA,MD 20889. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER SOC CELL BIOLOGY PI BETHESDA PA PUBL OFFICE, 9650 ROCKVILLE PIKE, BETHESDA, MD 20814 SN 1059-1524 J9 MOL BIOL CELL JI Mol. Biol. Cell PD SEP PY 1992 VL 3 SU S BP A180 EP A180 PG 1 WC Cell Biology SC Cell Biology GA JR255 UT WOS:A1992JR25501047 ER PT J AU LIGHT, SP AF LIGHT, SP TI WHY ENGINEERS DONT UNDERSTAND LOGISTICS SO NAVAL ENGINEERS JOURNAL LA English DT Article AB The author describes his observations during twenty-eight years of naval ship design, acquisition and logistics support experience that engineers do not understand logistics or even consider logistics as part of their engineering responsibilities. This paper will explore the reasons why. The paper will also provide reasons why the engineer should understand logistics and why it should become a part of the engineer's responsibilities and lexicon. The paper presents the position that an engineer armed with a knowledge of logistics can do the best job in producing a good supportability design. Recommendations are provided to the naval engineering and logistics communities to increase the logistics knowledge of engineers. Also, the author advocates the development of design techniques to be used by the engineer to produce good supportability designs. The increased role of the engineer in applying supportability design techniques will be required in the future if we are to do more with the planned reductions in the acquisition workforce. RP LIGHT, SP (reprint author), USN,SEA SYST COMMAND,SURFACE COMBATANTS DIRECTORATE,WASHINGTON,DC 20350, USA. NR 0 TC 0 Z9 0 U1 0 U2 1 PU AMER SOC NAVAL ENG INC PI ALEXANDRIA PA 1452 DUKE STREET, ALEXANDRIA, VA 22314-3458 SN 0028-1425 J9 NAV ENG J JI Nav. Eng. J. PD SEP PY 1992 VL 104 IS 5 BP 57 EP 63 PG 7 WC Engineering, Marine; Engineering, Civil; Oceanography SC Engineering; Oceanography GA JP978 UT WOS:A1992JP97800007 ER PT J AU FLEMING, BE AF FLEMING, BE TI MR-OVERTONS SOLUTION + BUTLER,SAMUEL THE 'WAY OF ALL FLESH' - ON SYSTEMS IN THOUGHT SO NEW ORLEANS REVIEW LA English DT Article RP FLEMING, BE (reprint author), USN ACAD,ANNAPOLIS,MD 21402, USA. NR 3 TC 0 Z9 0 U1 0 U2 0 PU LOYOLA UNIV PI NEW ORLEANS PA BOX 195, NEW ORLEANS, LA 70118 SN 0028-6400 J9 NEW ORLEANS REV JI New Orleans Rev. PD FAL-WIN PY 1992 VL 19 IS 3-4 BP 146 EP 152 PG 7 WC Literary Reviews SC Literature GA LJ228 UT WOS:A1992LJ22800038 ER PT J AU BLANK, DA AF BLANK, DA TI MODIFIED, DISCRETIZED-INTENSITY BASED, SPLIT-RADIATION CALCULATION PROCEDURE FOR USE IN FULL SIMULATION STUDIES OF COMBUSTION IN AXISYMMETRICAL PISTON ENGINES SO NUMERICAL HEAT TRANSFER PART A-APPLICATIONS LA English DT Article ID MODEL AB A control volume based procedure has been developed that makes possible the materially meaningful inclusion of radiation heat transfer in full simulation calculations for the axisymmetric version of the "modified discretized-intensity method." Included in this procedure is an innovative technique that splits the radiation problem in two. Each subproblem, in turn, can be solved more effectively than if the problem had not been split, making the overall approach just as effective in optically thin absorbing-emitting media as it is in optically thick media. The mass absorption coefficients used in the formulation are based on a molecular band analysis and are computed at a finite number of discrete locations along each intensity ray. The model has applicability to any control volume energy balance formulation. A description of the incorporation of the model into a primitive variable approach is given. Application of the model is made to the solution of a portion of the combustion stroke of a four-stroke piston engine to demonstrate the utility of the model in moving boundary problems. RP BLANK, DA (reprint author), USN ACAD,DEPT MECH ENGN,ANNAPOLIS,MD 21402, USA. NR 30 TC 5 Z9 5 U1 0 U2 0 PU HEMISPHERE PUBL CORP PI BRISTOL PA 1900 FROST ROAD, SUITE 101, BRISTOL, PA 19007-1598 SN 1040-7782 J9 NUMER HEAT TR A-APPL JI Numer. Heat Tranf. A-Appl. PD SEP PY 1992 VL 22 IS 2 BP 199 EP 222 DI 10.1080/10407789208944765 PG 24 WC Thermodynamics; Mechanics SC Thermodynamics; Mechanics GA JQ149 UT WOS:A1992JQ14900004 ER PT J AU TUTTLE, KL AF TUTTLE, KL TI REACTANTS FOR DEEP SUBMERGENCE VEHICLES SO OCEAN ENGINEERING LA English DT Note ID ATOMIC WEIGHTS AB This research compares reactants that have been identified for use in closed-loop, submerged heat engines by calculating the amount of reactant needed for a two-day voyage. The objective is to show calculated results for 13 combinations of potential reactants. Eleven different fuels and two different oxidizers were included. Using an overall thermodynamic efficiency of 26.5%, an engine on each fuel produces an average power of 20 kW for 48 hr on station plus power for 6 hr to descend 6000 m and 6 hr to ascend. The tabulated results show the mass of each reactant and product and the size of tank required. The chemical assumptions and constants used for the calculations have been provided to permit verification of the results. RP TUTTLE, KL (reprint author), USN ACAD,ANNAPOLIS,MD 21402, USA. NR 12 TC 0 Z9 0 U1 0 U2 0 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0029-8018 J9 OCEAN ENG JI Ocean Eng. PD SEP PY 1992 VL 19 IS 5 BP 479 EP 487 DI 10.1016/0029-8018(92)90006-P PG 9 WC Engineering, Marine; Engineering, Civil; Engineering, Ocean; Oceanography SC Engineering; Oceanography GA JR972 UT WOS:A1992JR97200006 ER PT J AU SARGENT, RG KANG, K GOLDSMAN, D AF SARGENT, RG KANG, K GOLDSMAN, D TI AN INVESTIGATION OF FINITE-SAMPLE BEHAVIOR OF CONFIDENCE-INTERVAL ESTIMATORS SO OPERATIONS RESEARCH LA English DT Article ID STANDARDIZED TIME-SERIES; RUN LENGTH CONTROL; SIMULATION OUTPUT AB We investigate the small-sample behavior and convergence properties of confidence interval estimators (CIEs) for the mean of a stationary discrete process. We consider CIEs arising from nonoverlapping batch means, overlapping batch means, and standardized time series, all of which are commonly used in discrete-event simulation. The performance measures of interest are the coverage probability, and the expected value and variance of the half-length. We use empirical and analytical methods to make detailed comparisons regarding the behavior of the CIEs for a variety of stochastic processes. All the CIEs under study are asymptotically valid; however, they are usually invalid for small sample sizes. We find that for small samples, the bias of the variance parameter estimator figures significantly in CIE coverage performance-the less bias the better. A secondary role is played by the marginal distribution of the stationary process. We also point out that some CIEs require fewer observations before manifesting the properties for CIE validity. C1 USN,GRAD SCH,DEPT ADM SCI,MONTEREY,CA 93940. GEORGIA INST TECHNOL,SCH IND & SYST ENGN,ATLANTA,GA 30332. RP SARGENT, RG (reprint author), SYRACUSE UNIV,SYRACUSE,NY 13244, USA. NR 32 TC 34 Z9 34 U1 0 U2 1 PU OPERATIONS RESEARCH SOC AMER PI LINTHICUM HTS PA 901 ELKRIDGE LANDING RD, STE 400, LINTHICUM HTS, MD 21090-2920 SN 0030-364X J9 OPER RES JI Oper. Res. PD SEP-OCT PY 1992 VL 40 IS 5 BP 898 EP 914 DI 10.1287/opre.40.5.898 PG 17 WC Management; Operations Research & Management Science SC Business & Economics; Operations Research & Management Science GA JU966 UT WOS:A1992JU96600007 ER PT J AU KEEFE, KS FREEMAN, WR PETERSON, TJ WILEY, CA CRAPOTTA, J QUICENO, JI LISTHAUS, AD AF KEEFE, KS FREEMAN, WR PETERSON, TJ WILEY, CA CRAPOTTA, J QUICENO, JI LISTHAUS, AD TI ATYPICAL HEALING OF CYTOMEGALOVIRUS RETINITIS - SIGNIFICANCE OF PERSISTENT BORDER OPACIFICATION SO OPHTHALMOLOGY LA English DT Article; Proceedings Paper CT 1991 ANNUAL MEETING OF THE AMERICAN ACADEMY OF OPHTHALMOLOGY CY OCT, 1991 CL ANAHEIM, CA SP AMER ACAD OPHTHALMOL ID IMMUNE-DEFICIENCY-SYNDROME; ACQUIRED IMMUNODEFICIENCY SYNDROME; VIRUS RETINITIS; OPHTHALMOLOGIC FINDINGS; IMMUNOSUPPRESSED HOSTS; OCULAR MANIFESTATIONS; PATHOGENIC MECHANISMS; SYNDROME AIDS; GANCICLOVIR; DISEASE AB Purpose: To analyze a phenomenon seen in patients with acquired immune deficiency syndrome (AIDS) with cytomegalovirus (CMV) retinitis undergoing systemic antiviral treatment: a persistent white border opacification on the edge of healed CMV retinitis. Patients and Methods: The authors prospectively evaluated a population of 137 patients with AIDS and CMV retinitis during a 44-month period. Eleven patients (12 eyes) who were undergoing maintenance antiviral treatment were identified with an atypical healing response-the persistence of a white flat border opacification that did not advance for many weeks to months. Patient records and photographs were reviewed. Results of one autopsy were analyzed with histopathology and special stains. Results: The persistent white edge maintained (without advancement or smoldering) for an average of 11.6 weeks (range, 4 to 41 weeks). This border opacification was not affected by reinduction treatment in the six patients to whom reinduction was given. Results from histopathologic examination of one patient with a persistent white border are presented: these results show that dead cytomegalic cells formed stable structures within the retina, causing white opacification that could be confused with active lesions. Immunoperoxidase stains identified CMV antigens. Conclusion: This persistent white border opacification, which does not advance or smolder, represents an important clinical entity that should be recognized during antiviral treatment for CMV retinitis. It can often be observed. If it is not recognized as a stable configuration, patients may undergo unnecessary reinductions with potentially toxic doses of antiviral medications. C1 USN HOSP,DEPT OPHTHALMOL,SAN DIEGO,CA 92134. UNIV CALIF SAN DIEGO,SCH MED,DEPT OPHTHALMOL,LA JOLLA,CA 92093. UNIV CALIF SAN DIEGO,SCH MED,DEPT PATHOL,LA JOLLA,CA 92093. UNIV CALIF SAN DIEGO,SCH MED,DEPT NEUROSCI,LA JOLLA,CA 92093. RP KEEFE, KS (reprint author), USN HOSP,DEPT CLIN INVEST,SAN DIEGO,CA 92134, USA. FU NEI NIH HHS [EY07366]; NIMH NIH HHS [MH45924]; NINDS NIH HHS [NS25178] NR 23 TC 9 Z9 9 U1 0 U2 0 PU LIPPINCOTT-RAVEN PUBL PI PHILADELPHIA PA 227 EAST WASHINGTON SQ, PHILADELPHIA, PA 19106 SN 0161-6420 J9 OPHTHALMOLOGY JI Ophthalmology PD SEP PY 1992 VL 99 IS 9 BP 1377 EP 1384 PG 8 WC Ophthalmology SC Ophthalmology GA JM227 UT WOS:A1992JM22700014 PM 1328980 ER PT J AU SZU, HH CAULFIELD, HJ AF SZU, HH CAULFIELD, HJ TI WAVELET TRANSFORMS SO OPTICAL ENGINEERING LA English DT Editorial Material C1 ALABAMA A&M UNIV,DEPT PHYS,NORMAL,AL 35762. RP SZU, HH (reprint author), USN,CTR SURFACE WARFARE,CODE R44,10901 NEW HAMPSHIRE AVE,SILVER SPRING,MD 20903, USA. NR 0 TC 17 Z9 20 U1 0 U2 0 PU SOC PHOTO-OPT INSTRUM ENG PI BELLINGHAM PA PO BOX 10, BELLINGHAM, WA 98227-0010 SN 0091-3286 J9 OPT ENG JI Opt. Eng. PD SEP PY 1992 VL 31 IS 9 BP 1823 EP 1824 DI 10.1117/12.61000 PG 2 WC Optics SC Optics GA JM047 UT WOS:A1992JM04700001 ER PT J AU SZU, HH TELFER, B LOHMANN, A AF SZU, HH TELFER, B LOHMANN, A TI CAUSAL ANALYTICAL WAVELET TRANSFORM SO OPTICAL ENGINEERING LA English DT Article DE WAVELET TRANSFORMS; ACOUSTOOPTICS; CAUSAL ANALYTICAL SIGNALS; CORRELATORS; WAVELETS ID SIGNALS AB The causal analytical wavelet transform employs exponentially decaying nonsinusoidal wideband transient bases of compact support. The basis set h(ab)(t) = h[(t - b)/a]/ square-root a is called daughter wavelets, which are constructed from a causal analytical mother wavelet h(t) by means of the dilation parameter a and the translation parameter b. We show that a causal (i.e., zero valued before signal arrives) and analytical mother wavelet still guarantees completeness. This permits the selection of mother wavelets that better match causal analytical input signals. An optical architecture is described for real-time implementation. C1 UNIV ERLANGEN NURNBERG,INST PHYS,W-8520 ERLANGEN,GERMANY. RP SZU, HH (reprint author), USN,CTR SURFACE WARFARE,CODE R44,10901 NEW HAMPSHIRE AVE,SILVER SPRING,MD 20903, USA. NR 13 TC 24 Z9 24 U1 0 U2 0 PU SOC PHOTO-OPT INSTRUM ENG PI BELLINGHAM PA PO BOX 10, BELLINGHAM, WA 98227-0010 SN 0091-3286 J9 OPT ENG JI Opt. Eng. PD SEP PY 1992 VL 31 IS 9 BP 1825 EP 1829 DI 10.1117/12.59911 PG 5 WC Optics SC Optics GA JM047 UT WOS:A1992JM04700002 ER PT J AU TELFER, B SZU, HH AF TELFER, B SZU, HH TI NEW WAVELET TRANSFORM NORMALIZATION TO REMOVE FREQUENCY BIAS SO OPTICAL ENGINEERING LA English DT Article DE WAVELET TRANSFORMS; FREQUENCY BIAS; OPTICAL CORRELATORS; WAVELET NORMALIZATION AB A new wavelet transform normalization procedure is proposed for the construction of a weighted bank of correlation filters. The standard normalization results in lower input frequencies producing larger wavelet transform magnitudes for equal-amplitude frequencies, while the new normalization produces equal responses as desired. This is illustrated with examples of Gibb's overshooting phenomenon and a cocktail party effect. A derivation is given to show that an inverse transform still exists when using the new normalization. RP TELFER, B (reprint author), USN,CTR SURFACE WARFARE,CODE R44,10901 NEW HAMPSHIRE AVE,SILVER SPRING,MD 20903, USA. NR 3 TC 32 Z9 33 U1 0 U2 0 PU SOC PHOTO-OPT INSTRUM ENG PI BELLINGHAM PA PO BOX 10, BELLINGHAM, WA 98227-0010 SN 0091-3286 J9 OPT ENG JI Opt. Eng. PD SEP PY 1992 VL 31 IS 9 BP 1830 EP 1834 DI 10.1117/12.59912 PG 5 WC Optics SC Optics GA JM047 UT WOS:A1992JM04700003 ER PT J AU CAULFIELD, HJ SZU, HH AF CAULFIELD, HJ SZU, HH TI PARALLEL DISCRETE AND CONTINUOUS WAVELET TRANSFORMS SO OPTICAL ENGINEERING LA English DT Article DE WAVELET TRANSFORMS; 4-D DISCRETE WAVELETS; 2-D CONTINUOUS WAVELETS; HOLOGRAPHIC WAVELETS; FOURIER FILTERS ID SIGNALS AB We consider theoretically the optical implementations of both discrete and continuous wavelet transforms. Discrete wavelet transforms (DWTs) require sums (or integrals) of the product of the input function with multiple stored functions (wavelets with various shifts and scales). The inverse DWT requires the same, except the given function is replaced by the wavelet coefficients determined by the DWT. We show that we can store and utilize in parallel large banks of wavelets. This should allow "instantaneous" DWT of functions of a single variable and (relatively) fast DWTs of two-dimensional functions. Of course, the same applies to the inverse DWTs. A true continuous wavelet transform (CWT) must be continuous in both shift and scale. By means of a continuous anamorphic transformation of a one-dimensional signal and a suitable choice of kernel or filter, we can allow a normal two-dimensional optical Fourier transform image processor to perform a CWT. C1 USN,CTR SURFACE WARFARE,SILVER SPRING,MD 20903. RP CAULFIELD, HJ (reprint author), ALABAMA A&M UNIV,DEPT PHYS,POB 1268,NORMAL,AL 35762, USA. NR 15 TC 29 Z9 32 U1 0 U2 0 PU SOC PHOTO-OPT INSTRUM ENG PI BELLINGHAM PA PO BOX 10, BELLINGHAM, WA 98227-0010 SN 0091-3286 J9 OPT ENG JI Opt. Eng. PD SEP PY 1992 VL 31 IS 9 BP 1835 EP 1839 DI 10.1117/12.59915 PG 5 WC Optics SC Optics GA JM047 UT WOS:A1992JM04700004 ER PT J AU SHENG, YL ROBERGE, D SZU, HH AF SHENG, YL ROBERGE, D SZU, HH TI OPTICAL WAVELET TRANSFORM SO OPTICAL ENGINEERING LA English DT Article DE WAVELET TRANSFORMS; OPTICAL MULTICHANNEL CORRELATORS; SHIFT INVARIANCE AB The wavelet transform is implemented using an optical multichannel correlator with a bank of wavelet transform filters. This approach provides a shift-invariant wavelet transform with continuous translation and discrete dilation parameters. The wavelet transform filters can be in many cases simply optical transmittance masks. Experimental results show detection of the frequency transition of the input signal by the optical wavelet transform. C1 USN,CTR SURFACE WARFARE,INFORMAT SCI GRP,SILVER SPRING,MD 20903. RP SHENG, YL (reprint author), UNIV LAVAL,CTR OPT PHOTON & LASER,DEPT PHYS,ST FOY G1K 7P4,QUEBEC,CANADA. NR 15 TC 101 Z9 114 U1 0 U2 0 PU SOC PHOTO-OPT INSTRUM ENG PI BELLINGHAM PA PO BOX 10, BELLINGHAM, WA 98227-0010 SN 0091-3286 J9 OPT ENG JI Opt. Eng. PD SEP PY 1992 VL 31 IS 9 BP 1840 EP 1845 DI 10.1117/12.59916 PG 6 WC Optics SC Optics GA JM047 UT WOS:A1992JM04700005 ER PT J AU YANG, XY SZU, HH SHENG, YL CAULFIELD, HJ AF YANG, XY SZU, HH SHENG, YL CAULFIELD, HJ TI OPTICAL HAAR WAVELET TRANSFORMS OF BINARY IMAGES SO OPTICAL ENGINEERING LA English DT Article DE WAVELET TRANSFORMS; SHADOW CASTING; POLARIZATION ENCODING; SPATIAL FILTERING; HAAR TRANSFORMS; CORNER WAVELETS; EDGE WAVELETS AB Two architectures in space and frequency domains are given to optically implement wavelet transforms (WT) in real time and in 2-D parallel, which in principle can circumvent the 4-D display requirement for 2-D WT. Specifically, we have experimentally performed the 2-D Haar WT of binary images directly in the space domain by means of a shadow-casting system using 2-D lenslet arrays and micropolarizers. Shadowing is natural for scale changes, and polarization encoding is necessary to realize the bipolar nature of Haar wavelets. Haar wavelets have two elementary types in 2-D, a corner mother wavelet and an edge mother wavelet. Both are useful for the real-time feature extraction for multiple-resolution image processing and pattern recognition. Moreover, a holographic processor that implements the 2-D Haar WT through filtering operations in the frequency domain is numerically simulated. The feasibility of both architectures is demonstrated and compared by computer simulations and experiments. C1 USN,CTR SURFACE WARFARE,INFORMAT SCI GRP,SILVER SPRING,MD 20903. UNIV LAVAL,CTR OPT PHOTON & LASER,DEPT PHYS,ST FOY G1K 7P4,QUEBEC,CANADA. ALABAMA A&M UNIV,DEPT PHYS,NORMAL,AL 35762. RP YANG, XY (reprint author), QUANTEX CORP,RES STAFF,2 RES COURT,ROCKVILLE,MD 20850, USA. NR 16 TC 35 Z9 43 U1 0 U2 1 PU SOC PHOTO-OPT INSTRUM ENG PI BELLINGHAM PA PO BOX 10, BELLINGHAM, WA 98227-0010 SN 0091-3286 J9 OPT ENG JI Opt. Eng. PD SEP PY 1992 VL 31 IS 9 BP 1846 EP 1851 DI 10.1117/12.59914 PG 6 WC Optics SC Optics GA JM047 UT WOS:A1992JM04700006 ER PT J AU ROGERS, GW SOLKA, JL PRIEBE, CE SZU, HH AF ROGERS, GW SOLKA, JL PRIEBE, CE SZU, HH TI OPTOELECTRONIC COMPUTATION OF WAVELET-LIKE BASED FEATURES SO OPTICAL ENGINEERING LA English DT Article DE WAVELET TRANSFORMS; ELECTRONICS; OPTICS; TEXTURE; DISCRIMINATION; SEGMENTATION AB We describe an optoelectronic system to extract gray-scale texture features. These systems utilize a nonlinear resistive grid to perform a 2-D pseudowavelet transform of the optical input image. Texture features are computed using first- and second-order variance estimates of the transform coefficients. Some preliminary results are presented that demonstrate the natural segmentation that the nonlinearity provides at the boundary of two dissimilar textures and the utility of the extracted features tor texture discrimination. C1 USN,CTR SURFACE WARFARE,INFORMAT SCI GRP,SILVER SPRING,MD 20903. RP ROGERS, GW (reprint author), USN,CTR SURFACE WARFARE,DAHLGREN DIV,CODE K12,DAHLGREN,VA 22448, USA. RI Priebe, Carey E./A-3305-2010 NR 12 TC 8 Z9 8 U1 0 U2 0 PU SOC PHOTO-OPT INSTRUM ENG PI BELLINGHAM PA PO BOX 10, BELLINGHAM, WA 98227-0010 SN 0091-3286 J9 OPT ENG JI Opt. Eng. PD SEP PY 1992 VL 31 IS 9 BP 1886 EP 1892 DI 10.1117/12.59981 PG 7 WC Optics SC Optics GA JM047 UT WOS:A1992JM04700010 ER PT J AU PHUVAN, S OH, TK CAVIRIS, N LI, Y SZU, HH AF PHUVAN, S OH, TK CAVIRIS, N LI, Y SZU, HH TI TEXTURE ANALYSIS BY SPACE-FILLING CURVES AND ONE-DIMENSIONAL HAAR WAVELETS SO OPTICAL ENGINEERING LA English DT Article DE WAVELET TRANSFORMS; TEXTURE ANALYSIS; HAAR WAVELETS; ONE-DIMENSIONAL SCAN AB A 1-D scan that follows the Peano curve to a desired resolution is demonstrated to preserve a 2-D proximity relationship and is shown to be efficient for wavelet transform (WT) processing and artificial neural network pattern recognition. This deterministic fractal sampling method can be implemented in real time using optoelectronic scanning. For example, 2-D texture patterns are analyzed by using 1-D wavelet transformation. Those WT coefficients can be fed into a standard back-propagation neural network for pattern recognition. C1 CUNY CITY COLL,DEPT ELECT ENGN,NEW YORK,NY 10031. USN,CTR SURFACE WARFARE,INFORMAT SCI GRP,SILVER SPRING,MD 20903. RP PHUVAN, S (reprint author), USN,CTR SURFACE WARFARE,WHITE OAK DETACHMENT,CODE G43,SILVER SPRING,MD 20903, USA. NR 19 TC 10 Z9 10 U1 0 U2 0 PU SOC PHOTO-OPT INSTRUM ENG PI BELLINGHAM PA PO BOX 10, BELLINGHAM, WA 98227-0010 SN 0091-3286 J9 OPT ENG JI Opt. Eng. PD SEP PY 1992 VL 31 IS 9 BP 1899 EP 1906 DI 10.1117/12.59957 PG 8 WC Optics SC Optics GA JM047 UT WOS:A1992JM04700012 ER PT J AU SZU, HH TELFER, B KADAMBE, S AF SZU, HH TELFER, B KADAMBE, S TI NEURAL NETWORK ADAPTIVE WAVELETS FOR SIGNAL REPRESENTATION AND CLASSIFICATION SO OPTICAL ENGINEERING LA English DT Article DE WAVELET TRANSFORMS; CLASSIFICATION; FEATURE SELECTION; NEURAL NETWORKS; PHONEME RECOGNITION; SIGNAL APPROXIMATION; SIGNAL REPRESENTATION; SPEAKER RECOGNITION ID PHONEME RECOGNITION AB Methods are presented for adaptively generating wavelet templates for signal representation and classification using neural networks. Different network structures and energy functions are necessary and are given for representation and classification. The idea is introduced of a "super-wavelet," a linear combination of wavelets that itself is treated as a wavelet. The super-wavelet allows the shape of the wavelet to adapt to a particular problem, which goes beyond adapting parameters of a fixed-shape wavelet. Simulations are given for 1-D signals, with the concepts extendable to imagery. Ideas are discussed for applying the concepts in the paper to phoneme and speaker recognition. C1 ALFRED I DUPONT INST,APPL SCI & ENGN LABS,WILMINGTON,DE 19899. RP SZU, HH (reprint author), USN,CTR SURFACE WARFARE,INFORMAT SCI GRP,CODE R44,10901 NEW HAMPSHIRE AVE,SILVER SPRING,MD 20903, USA. NR 32 TC 181 Z9 212 U1 0 U2 3 PU SOC PHOTO-OPT INSTRUM ENG PI BELLINGHAM PA PO BOX 10, BELLINGHAM, WA 98227-0010 SN 0091-3286 J9 OPT ENG JI Opt. Eng. PD SEP PY 1992 VL 31 IS 9 BP 1907 EP 1916 DI 10.1117/12.59918 PG 10 WC Optics SC Optics GA JM047 UT WOS:A1992JM04700013 ER PT J AU LU, XJ KATZ, A KANTERAKIS, EG LI, Y ZHANG, Y CAVIRIS, NP AF LU, XJ KATZ, A KANTERAKIS, EG LI, Y ZHANG, Y CAVIRIS, NP TI IMAGE-ANALYSIS VIA OPTICAL WAVELET TRANSFORM SO OPTICS COMMUNICATIONS LA English DT Article AB An optical implementation of the wavelet and inverse wavelet transforms is introduced. Appropriate wavelets and their corresponding band-pass filters are selected for optical processing. A multichannel optical processing system with two gratings is set up to obtain image representation and image reconstruction. Experimental results of optical wavelet transforms are given. The advantages and limitations of optical wavelet transforms are discussed. C1 SCS TELECOM INC,PORT WASHINGTON,NY 11050. CUNY CITY COLL,DEPT ELECT ENGN,NEW YORK,NY 10031. USN CTR,SURFACE WARFARE,SILVER SPRING,MD 20903. NR 10 TC 25 Z9 25 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0030-4018 J9 OPT COMMUN JI Opt. Commun. PD SEP 1 PY 1992 VL 92 IS 4-6 BP 337 EP 345 DI 10.1016/0030-4018(92)90644-7 PG 9 WC Optics SC Optics GA JK610 UT WOS:A1992JK61000030 ER PT J AU OLSEN, E AF OLSEN, E TI TARGET JAPAN AS AMERICA ECONOMIC FOE SO ORBIS-A JOURNAL OF WORLD AFFAIRS LA English DT Article RP OLSEN, E (reprint author), USN,POSTGRAD SCH,MONTEREY,CA 93940, USA. NR 15 TC 2 Z9 2 U1 0 U2 0 PU JAI PRESS INC PI GREENWICH PA 55 OLD POST RD-#2, PO BOX 1678, GREENWICH, CT 06836-1678 SN 0030-4387 J9 ORBIS-J WORLD AFF JI Orbis-J. World Aff. PD FAL PY 1992 VL 36 IS 4 BP 491 EP 503 PG 13 WC International Relations SC International Relations GA JL451 UT WOS:A1992JL45100001 ER PT J AU GIORDANO, J ROGERS, L AF GIORDANO, J ROGERS, L TI PUTATIVE MECHANISMS OF BUSPIRONE-INDUCED ANTINOCICEPTION IN THE RAT SO PAIN LA English DT Article DE BUSPIRONE; ANTINOCICEPTION; NOCICEPTION; 5-HT1A RECEPTORS; HYPOTHERMIA; ADRENAL; NEUROENDOCRINE; (RATS) ID ENDOGENOUS OPIATE; INDUCED ANALGESIA; FACTOR CRF; CAT; STIMULATION; ENKEPHALIN; NEURONS; SYSTEMS; STRESS AB Intraperitoneal administration of the serotonin 5-HT1A agonist, buspirone (1-5 mg/kg), produced dose- and time-related core hypothermia that was coincident with analgesia against a thermally noxious stimulus. Surface body temperature was not altered by buspirone. The 5-HT1A antagonist, NAN-190 (2 mg/kg, s.c.), blocked both hypothermic and analgesic effects, while systemic administration of the opioid antagonist, naloxone (1 mg/kg, s.c.), did not change the pattern of buspirone-induced hypothermia or analgesia. The apparent lack of opioid involvement and the documented role of the 5-HT1A receptor system in neuroendocrine substrates of thermoregulation and pain modulation prompted study of adrenal function in these buspirone-induced effects. Buspirone (5 mg/kg, i.p.) produced significant elevations in plasma epinephrine (EPI) and corticosterone (CST). Bilateral adrenalectomy reduced both control and buspirone-elevated EPI and CST levels and attenuated the antinociceptive, but not hypothermic, effects of buspirone (1-5 mg/kg, i.p.). Administration of the phenylethanolamine-N-methyltransferase (PNMT) inhibitor, dichloromethylbenzylamine (DCMB: 25 mg/kg, i.p.) reduced basal and buspirone-elevated plasma EPI, but not CST levels. This treatment did not affect buspirone-induced hypothermia, while significantly reducing buspirone antinociception. Pretreatment with the CST synthesis inhibitor, aminoglutethemide (AG: 2 x 25 mg/kg, i.p.), reduced plasma CST levels while not significantly affecting EPI. AG pretreatment did not alter the hypothermic effects of buspirone, but attenuated antinociception produced by the highest buspirone dose. The AG-induced reductions of buspirone antinociception were less than those effects produced by DCMB treatment. These data suggest that buspirone-induced antinociception may be a non-opioid, adrenally mediated co- and/or epi-phenomenon to core hypothermia evoked by 5-HTIA receptor agonism. C1 DRAKE UNIV,COLL PHAM & HLTH SCI,NEUROPHARMACOL LAB,DES MOINES,IA 50311. USN,FLEET HOSP,MED SERV CORPS,DES MOINES,IA. NR 21 TC 18 Z9 19 U1 1 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0304-3959 J9 PAIN JI Pain PD SEP PY 1992 VL 50 IS 3 BP 365 EP 372 DI 10.1016/0304-3959(92)90042-A PG 8 WC Anesthesiology; Clinical Neurology; Neurosciences SC Anesthesiology; Neurosciences & Neurology GA JQ383 UT WOS:A1992JQ38300016 PM 1454390 ER PT J AU KAMGARPARSI, B NARAYANAN, PJ DAVIS, LS AF KAMGARPARSI, B NARAYANAN, PJ DAVIS, LS TI SURFACE RECONSTRUCTION (OF ROUGH TERRAIN) IN RANGE IMAGE SHADOWS SO PATTERN RECOGNITION LETTERS LA English DT Article DE RANGE IMAGE; ROUGH SURFACE; SHADOW; SURFACE RECONSTRUCTION AB The common approach to estimating the surface elevation at a given point is based on weighted averaging of the elevations of the neighboring points. This approach often yields incorrect results for surface reconstruction in range image shadows; the elevation of the shadow region is often overestimated such that it could not have been occluded in the first place. In this letter we propose an algorithm that does not yield such incorrect results, and preserves the statistical poperties of the surface. The method is best suited for reconstruction of random stationary surfaces, such as rough terrain. It has applications in off-road autonomous land navigation. C1 UNIV MARYLAND,CTR AUTOMAT RES,COLL PK,MD 20742. RP KAMGARPARSI, B (reprint author), USN,RES LAB,CODE 5560,WASHINGTON,DC 20375, USA. NR 8 TC 0 Z9 0 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0167-8655 J9 PATTERN RECOGN LETT JI Pattern Recognit. Lett. PD SEP PY 1992 VL 13 IS 9 BP 657 EP 667 PG 11 WC Computer Science, Artificial Intelligence SC Computer Science GA JP444 UT WOS:A1992JP44400006 ER PT J AU BROOK, I FRAZIER, EH AF BROOK, I FRAZIER, EH TI MICROBIOLOGY OF SCALP ABSCESS IN NEWBORNS SO PEDIATRIC INFECTIOUS DISEASE JOURNAL LA English DT Note DE SCALP; ABSCESS; NEWBORN; BACTEROIDES SP; PEPTOSTREPTOCOCCUS SP ID NEONATAL SCALP; FETAL; OSTEOMYELITIS; INFECTION C1 USN,MED CTR,DEPT PEDIAT & PATHOL,BETHESDA,MD 20814. NR 14 TC 14 Z9 14 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 SEP PY 1992 VL 11 IS 9 BP 766 EP 768 PG 3 WC Immunology; Infectious Diseases; Pediatrics SC Immunology; Infectious Diseases; Pediatrics GA JN203 UT WOS:A1992JN20300017 PM 1448319 ER PT J AU WHITE, CT ROBERTSON, DH BRENNER, DW AF WHITE, CT ROBERTSON, DH BRENNER, DW TI DISSOCIATIVE PHASE-TRANSITIONS FROM HYPERVELOCITY IMPACTS SO PHYSICA A LA English DT Article; Proceedings Paper CT NATO ADVANCED RESEARCH WORKSHOP AND EUROPEAN PHYSICAL SOC LIQUID STATE CONF : NONEQUILIBRIUM CHEMICAL PHYSICS CY DEC 02-05, 1991 CL FREE UNIV BRUSSELS, BRUSSELS, BELGIUM SP NATO, EUROPEAN PHYS SOC HO FREE UNIV BRUSSELS ID MOLECULAR DISSOCIATION; DYNAMICS AB Molecular dynamics simulations are used to study hypervelocity impacts of an ultrathin flyer plate with a semi-infinite two-dimensional model diatomic molecular solid. These hypervelocity impacts are shown to produce a dissociative phase transition from a molecular to a close-packed solid in the target material. Although this close-packed phase persists for less than 10 picoseconds and is confined to a domain less than 10 nanometers wide it nevertheless behaves in a manner consistent with continuum theory. RP WHITE, CT (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. RI Brenner, Donald/D-1741-2009 NR 22 TC 9 Z9 9 U1 0 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0378-4371 J9 PHYSICA A JI Physica A PD SEP 1 PY 1992 VL 188 IS 1-3 BP 357 EP 366 DI 10.1016/0378-4371(92)90280-4 PG 10 WC Physics, Multidisciplinary SC Physics GA JP091 UT WOS:A1992JP09100035 ER PT J AU GILLESPIE, DT AF GILLESPIE, DT TI A RIGOROUS DERIVATION OF THE CHEMICAL MASTER EQUATION SO PHYSICA A LA English DT Article; Proceedings Paper CT NATO ADVANCED RESEARCH WORKSHOP AND EUROPEAN PHYSICAL SOC LIQUID STATE CONF : NONEQUILIBRIUM CHEMICAL PHYSICS CY DEC 02-05, 1991 CL FREE UNIV BRUSSELS, BRUSSELS, BELGIUM SP NATO, EUROPEAN PHYS SOC HO FREE UNIV BRUSSELS AB It is widely believed that the chemical master equation has no rigorous microphysical basis, and hence no a priori claim to validity. This view is challenged here through arguments purporting to show that the chemical master equation is exact for any gas-phase chemical system that is kept well stirred and thermally equilibrated. RP GILLESPIE, DT (reprint author), USN,CTR WEAP,RES DEPT,CHINA LAKE,CA 93555, USA. NR 6 TC 474 Z9 482 U1 3 U2 25 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0378-4371 J9 PHYSICA A JI Physica A PD SEP 1 PY 1992 VL 188 IS 1-3 BP 404 EP 425 DI 10.1016/0378-4371(92)90283-V PG 22 WC Physics, Multidisciplinary SC Physics GA JP091 UT WOS:A1992JP09100038 ER PT J AU FELDMAN, U AF FELDMAN, U TI ELEMENTAL ABUNDANCES IN THE UPPER SOLAR ATMOSPHERE SO PHYSICA SCRIPTA LA English DT Article ID DIELECTRONIC SATELLITE SPECTRA; HELIUM-LIKE IONS; PHOTOSPHERIC ABUNDANCES; ENERGETIC PARTICLES; CALCIUM ABUNDANCE; IRON ABUNDANCE; FLARE; CHROMOSPHERE; REGION; CARBON AB Elemental abundances in the solar wind (SW) and in solar energetic particles (SEP) are different from abundances in the photosphere. A reassessment of spectroscopic abundance measurements from high temperature solar plasmas [1] showed that, indeed, on the average, the solar upper atmosphere possesses a composition which is similar in nature to the composition of the SW and SEPs. In the last few years a detailed examination of spectra of the upper solar atmosphere has confirmed the above results and proceeded to show that elemental abundances change from region to region by as much as an order of magnitude. An account of these changes, a description of the regions in which the changes occur, and a possible elemental enrichment model is given. RP USN, RES LAB, EO HULBURT CTR SPACE RES, WASHINGTON, DC 20375 USA. NR 65 TC 436 Z9 436 U1 1 U2 2 PU IOP PUBLISHING LTD PI BRISTOL PA TEMPLE CIRCUS, TEMPLE WAY, BRISTOL BS1 6BE, ENGLAND SN 0031-8949 EI 1402-4896 J9 PHYS SCRIPTA JI Phys. Scr. PD SEP PY 1992 VL 46 IS 3 BP 202 EP 220 DI 10.1088/0031-8949/46/3/002 PG 19 WC Physics, Multidisciplinary SC Physics GA JH436 UT WOS:A1992JH43600002 ER PT J AU GREUS, C ORTH, A DAIMINGER, F BUTOV, LV REINECKE, TL FORCHEL, A AF GREUS, C ORTH, A DAIMINGER, F BUTOV, LV REINECKE, TL FORCHEL, A TI OPTICAL-PROPERTIES OF BARRIER-MODULATED INGAAS/GAAS QUANTUM WIRES SO PHYSICA STATUS SOLIDI B-BASIC RESEARCH LA English DT Article ID SEMICONDUCTOR AB The optical properties of barrier-modulated InGaAs/GaAs quantum wires with dimensions down to 25 nm arc investigated. The wires show a high quantum efficiency that is mainly due to the processing which is free of defects and also due to efficient carrier capture effects. For wire widths below about 50 nm a blue shift of the emission due to lateral quantization, is observed. In high excitation experiments a second subband is observed for narrow wire widths. The experimentally observed wire width dependence of the band edge and of the Subband splitting are in agreement with model calculations based on the geometry of our structures. C1 RUSSIAN ACAD SCI,CHERNOGOLOVKA,USSR. USN,RES LAB,WASHINGTON,DC 20375. RP GREUS, C (reprint author), UNIV WURZBURG,LEHRSTUHL TECH PHYS,HUBLAND,W-8700 WURZBURG,GERMANY. OI Forchel, Alfred/0000-0002-9377-9935 NR 8 TC 0 Z9 0 U1 0 U2 0 PU AKADEMIE VERLAG GMBH PI BERLIN PA MUHLENSTRASSE 33-34, D-13187 BERLIN, GERMANY SN 0370-1972 J9 PHYS STATUS SOLIDI B JI Phys. Status Solidi B-Basic Res. PD SEP PY 1992 VL 173 IS 1 BP 323 EP 330 DI 10.1002/pssb.2221730131 PG 8 WC Physics, Condensed Matter SC Physics GA JR284 UT WOS:A1992JR28400030 ER PT J AU SINGH, DJ SCHWARZ, K BLAHA, P AF SINGH, DJ SCHWARZ, K BLAHA, P TI ELECTRIC-FIELD GRADIENTS IN YBA2CU3O7 - DISCREPANCY BETWEEN EXPERIMENTAL AND LOCAL-DENSITY-APPROXIMATION CHARGE-DISTRIBUTIONS SO PHYSICAL REVIEW B LA English DT Note ID BRILLOUIN-ZONE; FUNCTIONAL CALCULATIONS; SPECIAL POINTS; SUPERCONDUCTORS; FORMALISM; LA2CUO4; OXIDES AB Local-density-approximation (LDA) -based calculations of electric-field gradients (EFG's) for YBa2Cu3O7 using an extended linearized-augmented-plane-wave method are reported. This extended method controls errors that might arise from extended core states on the Y ions or linearization of the narrow 3p states. The calculated EFG's agree well with experiment except for the plane Cu site. For this site a large discrepancy is found, which is attributed to an inadequate description of anisotropic effects within the LDA. C1 VIENNA TECH UNIV,INST TECHN ELEKTROCHEM,A-1060 VIENNA,AUSTRIA. RP SINGH, DJ (reprint author), USN,RES LAB,COMPLEX SYST THEORY BRANCH,WASHINGTON,DC 20375, USA. RI Blaha, Peter/F-2847-2010; Singh, David/I-2416-2012 NR 38 TC 30 Z9 31 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 SEP 1 PY 1992 VL 46 IS 9 BP 5849 EP 5852 DI 10.1103/PhysRevB.46.5849 PG 4 WC Physics, Condensed Matter SC Physics GA JM064 UT WOS:A1992JM06400121 ER PT J AU KRESIN, VZ WOLF, SA AF KRESIN, VZ WOLF, SA TI INDUCED SUPERCONDUCTING STATE AND 2-GAP STRUCTURE - APPLICATION TO CUPRATE SUPERCONDUCTORS AND CONVENTIONAL MULTILAYERS SO PHYSICAL REVIEW B LA English DT Article ID HIGH-TC SUPERCONDUCTIVITY; TRANSITION-TEMPERATURE; SINGLE-CRYSTAL; ENERGY-GAP; YBA2CU3O7; PARAMETERS; BI2SR2CA2CU3OX; CONDUCTIVITY; RESISTIVITY; OXIDES AB An induced superconducting state caused by charge transfer between intrinsically superconducting (a) and intrinsically normal (beta) subsystems is studied. A most interesting case is a layered system with some layers being normal. An analysis of the general Hamiltonian describing the phenomenon allows us to evaluate T(c) and the spectrum, which displays a two-gap structure. A superconducting state can be induced through different charge transfer channels (intrinsic proximity effect; inelastic two-band channel). A very important contribution comes from the "mixed" channel. Systems with various strengths of the coupling are described. The presence of magnetic impurities leads to an induced gapless superconductivity. This model is applied to high-T(c) cuprates (in particular, to Y-Ba-Cu-O), as well as to conventional systems. The spectroscopy of Y-Ba-Cu-O appears to be very sensitive to the oxygen content whereas T(c) changes relatively slowly. The model is directly related to such phenomena as residual microwave losses, zero-bias anomalies, the "plateau" effect, etc. C1 USN,RES LAB,WASHINGTON,DC 20375. RP KRESIN, VZ (reprint author), LAWRENCE BERKELEY LAB,BERKELEY,CA 94720, USA. RI Wolf, Stuart/A-7513-2009 NR 76 TC 161 Z9 162 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 SEP 1 PY 1992 VL 46 IS 10 BP 6458 EP 6471 DI 10.1103/PhysRevB.46.6458 PG 14 WC Physics, Condensed Matter SC Physics GA JM409 UT WOS:A1992JM40900065 ER PT J AU MCLEAN, E AF MCLEAN, E TI X-RAY LASERS ACHIEVE SATURATION SO PHYSICS WORLD LA English DT Article RP MCLEAN, E (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU IOP PUBLISHING LTD PI BRISTOL PA TECHNO HOUSE, REDCLIFFE WAY, BRISTOL, ENGLAND BS1 6NX SN 0953-8585 J9 PHYS WORLD JI Phys. World PD SEP PY 1992 VL 5 IS 9 BP 24 EP 25 PG 2 WC Physics, Multidisciplinary SC Physics GA JM540 UT WOS:A1992JM54000019 ER PT J AU FRANTZICH, SE AF FRANTZICH, SE TI KNOWLEDGE, POWER AND THE CONGRESS - ROBINSON,WH, WELLBORN,CH SO POLITICAL SCIENCE QUARTERLY LA English DT Book Review RP FRANTZICH, SE (reprint author), USN ACAD,ANNAPOLIS,MD 21402, USA. NR 1 TC 0 Z9 0 U1 0 U2 0 PU ACAD POLITICAL SCIENCE PI NEW YORK PA 475 RIVERSIDE DRIVE, SUITE 1274, NEW YORK, NY 10115-1274 SN 0032-3195 J9 POLIT SCI QUART JI Polit. Sci. Q. PD FAL PY 1992 VL 107 IS 3 BP 563 EP 564 DI 10.2307/2152464 PG 2 WC Political Science SC Government & Law GA JV844 UT WOS:A1992JV84400028 ER PT J AU CHIPMAN, SF KRANTZ, DH SILVER, R AF CHIPMAN, SF KRANTZ, DH SILVER, R TI MATHEMATICS ANXIETY AND SCIENCE CAREERS AMONG ABLE COLLEGE-WOMEN SO PSYCHOLOGICAL SCIENCE LA English DT Article ID GENDER AB Does mathematics anxiety deflect able students from pursuing scientific careers? We obtained the Scholastic Aptitude Test (SAT) scores of 1,366 students entering Barnard College and also questioned them about their career interests and their feelings about mathematics learning. At every level of mathematical skill, math anxiety correlated negatively with interest in scientific careers. Contrariwise, quantitative SAT score was unrelated to career interests, within relatively homogeneous categories of math anxiety or confidence. Students were also asked directly whether the desire to avoid math affected their career choices. The responses suggested a mediating role for math anxiety or confidence in career choice. C1 COLUMBIA UNIV,NEW YORK,NY 10027. COLUMBIA UNIV BARNARD COLL,NEW YORK,NY 10027. RP CHIPMAN, SF (reprint author), OFF NAVAL RES,1142CS,800 N QUINCY ST,ARLINGTON,VA 22217, USA. NR 11 TC 45 Z9 45 U1 2 U2 9 PU CAMBRIDGE UNIV PRESS PI NEW YORK PA 40 WEST 20TH STREET, NEW YORK, NY 10011-4211 SN 0956-7976 J9 PSYCHOL SCI JI Psychol. Sci. PD SEP PY 1992 VL 3 IS 5 BP 292 EP 295 DI 10.1111/j.1467-9280.1992.tb00675.x PG 4 WC Psychology, Multidisciplinary SC Psychology GA JM686 UT WOS:A1992JM68600008 ER PT J AU CLARK, DP KASERMAN, DL MELESE, F AF CLARK, DP KASERMAN, DL MELESE, F TI DOMESTIC MARKET-STRUCTURE AND INTERNATIONAL-TRADE IN AN OPEN-ECONOMY SO QUARTERLY REVIEW OF ECONOMICS AND FINANCE LA English DT Article ID FOREIGN-TRADE; DETERMINANTS AB This article examines the relationship between domestic concentration and net exports at the industry level. Prior theoretical models are extended to allow a positive and finite elasticity of foreign supply on world markets. This extension permits the derivation of an unambiguous relationship between domestic market structure (concentration) and net exports in the absence of any assumptions concerning trade barriers or price discrimination. Empirical results are found to support the hypothesized relationship. C1 AUBURN UNIV,AUBURN,AL 36849. USN,POSTGRAD SCH,WASHINGTON,DC 20350. RP CLARK, DP (reprint author), UNIV TENNESSEE,KNOXVILLE,TN 37996, USA. NR 13 TC 5 Z9 5 U1 0 U2 1 PU JAI PRESS INC PI GREENWICH PA 55 OLD POST RD-#2, PO BOX 1678, GREENWICH, CT 06836-1678 SN 1062-9769 J9 Q REV ECON FINANC JI Q. Rev. Econ. Financ. PD FAL PY 1992 VL 32 IS 3 BP 3 EP 15 PG 13 WC Business, Finance; Economics SC Business & Economics GA JZ953 UT WOS:A1992JZ95300001 ER PT J AU CHERMAK, JM AF CHERMAK, JM TI POLITICAL RISK ANALYSIS - PAST AND PRESENT SO RESOURCES POLICY LA English DT Article ID DIRECT FOREIGN-INVESTMENT; DEVELOPING-COUNTRIES AB Political risk should be a concern to any investor evaluating the potential of a foreign investment. This is especially true in the extractive industries where hold up problems, common to sunk cost investments, may appear in the form of Vernon's obsolescing bargain. This paper surveys the political risk literature and current evaluation methods available to natural resource investors; discusses strengths and weaknesses of the approaches; and offers possible considerations for future work. Although substantial contributions have been made, much work remains to be done, such as more quantitative assessments which can be directly incorporated into economic analysis of potential projects. RP CHERMAK, JM (reprint author), USN,POSTGRAD SCH,MONTEREY,CA 93940, USA. NR 48 TC 4 Z9 4 U1 1 U2 2 PU BUTTERWORTH-HEINEMANN LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, OXON, ENGLAND OX5 1GB SN 0301-4207 J9 RESOUR POLICY JI Resour. Policy PD SEP PY 1992 VL 18 IS 3 BP 167 EP 178 DI 10.1016/0301-4207(92)90002-Q PG 12 WC Environmental Studies SC Environmental Sciences & Ecology GA JL820 UT WOS:A1992JL82000002 ER PT J AU MITRA, S AF MITRA, S TI ELEVATED-TEMPERATURE MECHANICAL-PROPERTIES OF A RAPIDLY SOLIDIFIED AL-FE-V-SI ALLOY SO SCRIPTA METALLURGICA ET MATERIALIA LA English DT Article ID DUCTILITY RP MITRA, S (reprint author), NAVAL POST GRAD SCH,DEPT MECH ENGN,MAT SCI GRP,MONTEREY,CA 93943, USA. NR 16 TC 18 Z9 24 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 SEP 1 PY 1992 VL 27 IS 5 BP 521 EP 526 DI 10.1016/0956-716X(92)90333-A PG 6 WC Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Materials Science; Metallurgy & Metallurgical Engineering GA JH566 UT WOS:A1992JH56600002 ER PT J AU WEISS, PJ KENNEDY, CA MCCANN, DF HILL, HE OLDFIELD, EC AF WEISS, PJ KENNEDY, CA MCCANN, DF HILL, HE OLDFIELD, EC TI FULMINANT ENDOCARDITIS DUE TO INFECTION WITH PENICILLINASE-PRODUCING NEISSERIA-GONORRHOEAE SO SEXUALLY TRANSMITTED DISEASES LA English DT Article ID DISSEMINATED GONOCOCCAL-INFECTION; BLOOD CULTURE MEDIA; OLD DISEASE; MENINGITIDIS; GELATIN AB Endocarditis is a rare but potentially lethal manifestation of gonococcal infection. We report the case of a patient with fulminant endocarditis secondary to infection with penicillinase-producing Neisseria gonorrhoeae (PPNG). The patient had rapid deterioration from extensive destruction of the aortic valve with abscess and fistula formation. Lifesaving emergency surgery was performed. To our knowledge this is the first reported case of gonococcal endocarditis secondary to infection with a penicillinase-producing organism. C1 USN HOSP,DEPT INTERNAL MED,DIV INFECT DIS & CARDIOL,SAN DIEGO,CA 92134. RP WEISS, PJ (reprint author), USN HOSP,DEPT CLIN INVEST,SAN DIEGO,CA 92134, USA. NR 11 TC 11 Z9 11 U1 0 U2 0 PU LIPPINCOTT-RAVEN PUBL PI PHILADELPHIA PA 227 EAST WASHINGTON SQ, PHILADELPHIA, PA 19106 SN 0148-5717 J9 SEX TRANSM DIS JI Sex. Transm. Dis. PD SEP-OCT PY 1992 VL 19 IS 5 BP 288 EP 290 DI 10.1097/00007435-199209000-00009 PG 3 WC Infectious Diseases SC Infectious Diseases GA JQ318 UT WOS:A1992JQ31800009 PM 1411846 ER PT J AU RANDEL, JM MORRIS, BA WETZEL, CD WHITEHILL, BV AF RANDEL, JM MORRIS, BA WETZEL, CD WHITEHILL, BV TI THE EFFECTIVENESS OF GAMES FOR EDUCATIONAL PURPOSES - A REVIEW OF RECENT RESEARCH SO SIMULATION & GAMING LA English DT Article DE EDUCATIONAL; EFFECTIVENESS; EVALUATION; INSTRUCTIONAL; GAMES; REVIEW; SIMULATIONS ID SIMULATION GAMES AB This article reviews the literature that compares the instructional effectiveness of games to conventional classroom instruction. Studies dealing with empirical research rather than teachers' judgments are reviewed. Published reviews of research in English dating from 1963 to 1984 were examined and the literature was searched for studies from 1984 to 1991. Of the 67 studies considered over a period of 28 years, 38 show no difference between games and conventional instruction; 22 favor games; 5 favor games, but their controls are questionable; and 3 favor conventional instruction. Results for social sciences, math, language arts, logic, physics, biology, retention over time, and interest are examined. Math is the subject area with the greatest percentage of results favoring games, but only eight studies have adequate controls. Thirty-three out of 46 social science games/simulations show no difference between games/simulations and classroom instruction. The authors conclude that subject matter areas where very specific content can be targeted are more likely to show beneficial effects for gaming. RP RANDEL, JM (reprint author), USN,CTR PERSONNEL RES & DEV,DEPT TRAINING SYST,SAN DIEGO,CA 92152, USA. NR 40 TC 170 Z9 172 U1 3 U2 40 PU SAGE PUBLICATIONS INC PI THOUSAND OAKS PA 2455 TELLER RD, THOUSAND OAKS, CA 91320 SN 1046-8781 J9 SIMULAT GAMING JI Simul. Gaming PD SEP PY 1992 VL 23 IS 3 BP 261 EP 276 DI 10.1177/1046878192233001 PG 16 WC Social Sciences, Interdisciplinary SC Social Sciences - Other Topics GA JK644 UT WOS:A1992JK64400001 ER PT J AU GOLDMAN, G WELBOURN, R KLAUSNER, JM KOBZIK, L VALERI, CR SHEPRO, D HECHTMAN, HB AF GOLDMAN, G WELBOURN, R KLAUSNER, JM KOBZIK, L VALERI, CR SHEPRO, D HECHTMAN, HB TI MAST-CELLS AND LEUKOTRIENES MEDIATE NEUTROPHIL SEQUESTRATION AND LUNG EDEMA AFTER REMOTE ISCHEMIA IN RODENTS SO SURGERY LA English DT Article ID PULMONARY MICROVASCULAR PERMEABILITY; LOWER TORSO ISCHEMIA; LEUKOCYTE ADHESION; LIMB ISCHEMIA; REPERFUSION INJURY; ENDOTHELIAL-CELLS; ADHERENCE; ACTIVATION; DIAPEDESIS; DEPENDENCE AB Reperfusion of ischemic hindlimbs leads to leukotriene B4 (LTB4) and polymorphonuclear neutrophil (PMN) -dependent lung injury. Pulmonary mast cells are capable of synthesizing LTB4 and are potential mediators of this inflammatory response. This study tests their role in PMN sequestration and pulmonary edema after hindlimb ischemia. Anesthetized, mast cell-sufficient mice (n = 8) or their congeneic mast cell-deficient strain (n = 8) were subjected to 3 hours of hindlimb ischemia. After another 3 hours of reperfusion, plasma LTB4 levels rose to 651 pg/ml, higher than sham ischemic control (n = 8) values of 202 pg/ml (p < 0.05) - At this time there was sequestration of neutrophils in the pulmonary microcirculation (54 PMN/10 high-power fields [HPF]) and an increase in lung wet/dry weight ratio (W/D) of 4.4. Both these values were higher (p < 0.05) than those in sham ischemic animals that showed sequestration of 18 PMN/10 HPF and a lung W/D of 3. 1. In contrast, mast cell-deficient mice showed an attenuation of ischemia- and reperfusion-induced rise in plasma LTB4 (507 pg/ml), fewer sequestered neutrophils (34 PMNs/10 HPF), and a reduction in lung W/D to 3.9 (all p < 0.05). To test the role of lung LTB4 in determining PMN sequestration, rats (n = 78) were subjected to 3 hours of hindlimb ischemia. After 3 hours of reperfusion, plasma and bronchoalveolar lavage (BAL) LTB4 concentrations rose to 956 and 211 pg/ml, respectively-higher than sham values of 460 and 121 pg/ml (both p < 0.05). After 4 hours, plasma LTB4 levels had returned to baseline, whereas BAL LTB4 had increased further to 658 pg/ml, indicating lung origin. Treatment of other rats by localized lung lavage of the lipoxygenase inhibitor diethylcarbamazine (80 mg/kg in 0. 1 ml twice) prevented the ischemia- and reperfusion-induced rise in BAL LTB4 (267 pg/ml) and limited local neutrophil sequestration (from 51 PMN/10 HPF after saline aspiration to 36 PMN/10 HPF) and lung W/D (from 4.5 to 4. 1) (all p < 0.05). The data indicate that after hindlimb ischemia pulmonary mast cells and localized LTB4 synthesis mediate, in part, the lung inflammatory response. C1 HARVARD UNIV,BRIGHAM & WOMENS HOSP,SCH MED,DEPT SURG,75 FRANCIS ST,BOSTON,MA 02115. HARVARD UNIV,BRIGHAM & WOMENS HOSP,SCH MED,DEPT PATHOL,BOSTON,MA 02115. BOSTON UNIV,USN,BLOOD RES LAB,BOSTON,MA 02215. BOSTON UNIV,CTR BIOL SCI,BOSTON,MA 02215. FU NCI NIH HHS [CM24891-11]; NIGMS NIH HHS [GM24891-11, GM35141-03] NR 34 TC 45 Z9 46 U1 0 U2 0 PU MOSBY-YEAR BOOK INC PI ST LOUIS PA 11830 WESTLINE INDUSTRIAL DR, ST LOUIS, MO 63146-3318 SN 0039-6060 J9 SURGERY JI Surgery PD SEP PY 1992 VL 112 IS 3 BP 578 EP 586 PG 9 WC Surgery SC Surgery GA JL180 UT WOS:A1992JL18000015 PM 1325674 ER PT J AU HYAMS, KC CROSS, ER BIANCO, MA SOYKSARTY, DR ROPER, CM DAHUT, WL HOLMBERG, JA AF HYAMS, KC CROSS, ER BIANCO, MA SOYKSARTY, DR ROPER, CM DAHUT, WL HOLMBERG, JA TI GEOGRAPHIC RISK-FACTORS FOR VIRAL-HEPATITIS AND CYTOMEGALOVIRUS-INFECTION AMONG UNITED-STATES-ARMED-FORCES BLOOD-DONORS SO TRANSFUSION LA English DT Article ID NON-B HEPATITIS; C VIRUS; NON-A; ANTIBODIES; EXPERIENCE AB In an effort to determine whether residence in a foreign country increases the risk of hepatitis B and C and cytomegalovirus (CMV) infection in United States (US) Armed Forces blood donors, 5719 volunteer donors at four US Navy blood banks were evaluated. Most participants were repeat donors' (68%) and were young (mean age, 25 years), male (88%), and white (80%), black (10%), or Hispanic (7%). Birth outside of the United States was reported by 6 percent of subjects, and 34 percent had lived in a foreign country for more than 3 months. Twenty (0.3%) subjects had hepatitis B surface antigen (HBsAg), and 100 (1.7%) had antibody to hepatitis B core antigen (anti-HBc). Thirty-four (0.6%) were repeatably reactive in enzyme-linked immunosorbent assay for antibody to hepatitis C virus (anti-HCV); 11 (0.2%) had anti-HCV in immunoblot assay. Of the 3484 donors tested for anti-CMV, 1117 (32.1%) were positive. When demographic characteristics were controlled for, both anti-HBc and anti-CMV seropositivities were independently associated in male blood donors with residence in the Philippines. Geographic factors were not associated with HBsAg and anti-HCV positivity. These findings indicate that the prevalence of serologic markers for viral hepatitis is low in military blood donors, but that residence in the Western Pacific is a risk factor for hepatitis B and CMV infection. C1 NATL NAVAL MED CTR, DEPT INTERNAL MED, BETHESDA, MD 20814 USA. NATL NAVAL MED CTR, BLOOD BANK BRANCH, BETHESDA, MD 20814 USA. USN HOSP, DIV BLOOD BANK, SAN DIEGO, CA 92134 USA. USN HOSP, BLOOD BANK BRANCH, PORTSMOUTH, VA USA. RP HYAMS, KC (reprint author), USN, MED RES INST, DIV EPIDEMIOL, 12300 WASHINGTON AVE, ROCKVILLE, MD 20885 USA. NR 23 TC 11 Z9 11 U1 0 U2 0 PU AMER ASSOC BLOOD BANKS PI BETHESDA PA 8101 GLENBROOK RD, BETHESDA, MD 20814-2749 SN 0041-1132 J9 TRANSFUSION JI Transfusion PD SEP PY 1992 VL 32 IS 7 BP 644 EP 647 DI 10.1046/j.1537-2995.1992.32792391038.x PG 4 WC Hematology SC Hematology GA JM761 UT WOS:A1992JM76100010 PM 1325694 ER PT J AU LILLO, RS MACCALLUM, ME CALDWELL, JM AF LILLO, RS MACCALLUM, ME CALDWELL, JM TI INTRAVASCULAR BUBBLE COMPOSITION IN GUINEA-PIGS - A POSSIBLE EXPLANATION FOR DIFFERENCES IN DECOMPRESSION RISK AMONG DIFFERENT GASES SO UNDERSEA BIOMEDICAL RESEARCH LA English DT Article DE DIVING; DECOMPRESSION SICKNESS; HYPERBARIC; INERT GASES; GAS CHROMATOGRAPHY ID INERT-GASES; RATS; DIVES; DEPTH AB Differences in risk of decompression sickness (DCS) that have been observed among inert gases may reflect differences in gas solubility or diffusivity or both. A higher risk gas might generate a larger volume of evolved gas during decompression, thereby increasing the probability of DCS. If this hypothesis is correct, the composition of bubbles that develop during decompression should reflect such gas differences. Unanesthetized guinea pigs were compressed to depths ranging from 250 to 350 fsw with air, He-O2 (21% O2) or one of a number of N2-He-O2 or N2-Ar-O2 mixtures (21% O2). Animals were held at depth from 15 to 60 min, then decompressed slowly (60 fsw/min) or rapidly (< 15 s) to 5 fsw. If severe DCS developed, as judged by changes in physiologic variables, death usually occurred quickly. Gas/blood samples were then immediately withdrawn from the right atrium or the inferior vena cava, and the gas phase analyzed for He, N2, Ar, O2, and CO2 via gas chromatography. Bubbles from all dives contained 5-9% CO2, 1-4% O2, with the balance inert gas. Bubbles after N2-He-O2, dives contained substantially more N2 than He (up to 1.9 times more) compared to the dive mixture; bubbles after N2-Ar-O2 dives contained more Ar than N2 (up to 1.8 times more). For N2-He-O2, dives, the actual inert gas makeup of bubbles was dependent on the time-at-depth and the decompression profile. Results may reflect differences among He, N2, and Ar in tissue solubility/diffusivity and gas exchange rates, and support the rank order of increasing DCS risk (He < N2 < Ar) and rate of gas exchange (N2 < He) observed previously during rat dives. RP LILLO, RS (reprint author), USN,RES INST,BETHESDA,MD 20814, USA. NR 24 TC 7 Z9 7 U1 0 U2 0 PU UNDERSEA & HYPERBARIC MEDICAL SOC INC PI KENSINGTON PA 10531 METROPOLITAN AVE, KENSINGTON, MD 20895 SN 0093-5387 J9 UNDERSEA BIOMED RES PD SEP PY 1992 VL 19 IS 5 BP 375 EP 386 PG 12 WC Oceanography SC Oceanography GA JK708 UT WOS:A1992JK70800006 PM 1355314 ER PT J AU HARR, PA ELSBERRY, RL HOGAN, TF CLUNE, WM AF HARR, PA ELSBERRY, RL HOGAN, TF CLUNE, WM TI FORECASTS OF NORTH PACIFIC MARITIME CYCLONES WITH THE NAVY OPERATIONAL GLOBAL ATMOSPHERIC PREDICTION SYSTEM SO WEATHER AND FORECASTING LA English DT Article AB Seventy-two-hour forecasts of sea level cyclones from the Navy Operational Global Atmospheric Prediction System are examined. Cyclones that formed over the North Pacific region of maximum cyclogenesis frequency are included for study. The analysis is oriented to assist the forecaster in evaluating the numerical model guidance by emphasizing verification of operationally oriented factors (i.e., cyclogenesis, explosive deepening). Initially, systematic errors in forecast intensities and positions are identified. Maximum underforecasting errors (forecast central pressure higher than actual central pressure) occur over the central North Pacific region of climatological maximum cyclone deepening. Maximum overforecasting errors (forecast central pressure lower than the actual central pressure) occur over the region of climatological cyclone dissipation. Maximum position errors also occur over the central North Pacific region of climatological maximum deepening. These systematic error distributions indicate that there are diagnostic relationships between forecast performance, the cyclone track type, and whether the cyclone is deepening or filling at the forecast verification time. The forecast intensity and position errors are stratified based on the 72-h forecast intensity change, which is one possible measure of forecast accuracy that uses information known at the initial time of the forecast rather than the verifying time. Three classes of intensity change are identified as deepening, filling, and mixed deepening and filling. The systematic intensity errors mainly comprise instances when a 72-h deepening profile was not forecast and a deepening or mixed deepening-filling profile actually occurred. When the category of intensity change is correctly forecast, cyclones forecast to follow a western Pacific track tend to be overforecast, while those forecast to follow a central Pacific track tend to be underforecast. It is hypothesized that one reason for these differences may be due to the relative importance of adiabatic versus diabatic processes involved in the development of cyclones following each track type. Furthermore, central Pacific cyclones become more removed from available initializing data on the Asian continent. Position errors are more sensitive to the forecast track type rather than the forecast central-pressure profile. Model tendencies based on the forecast intensity change and track type are presented to aid the users of the numerical guidance recognize instances when the forecast performance may be exceptionally high or low. RP HARR, PA (reprint author), USN,POSTGRAD SCH,DEPT METEOROL,CODE MR-HP,MONTEREY,CA 93943, USA. NR 0 TC 5 Z9 5 U1 0 U2 1 PU AMER METEOROLOGICAL SOC PI BOSTON PA 45 BEACON ST, BOSTON, MA 02108-3693 SN 0882-8156 J9 WEATHER FORECAST JI Weather Forecast. PD SEP PY 1992 VL 7 IS 3 BP 456 EP 467 DI 10.1175/1520-0434(1992)007<0456:FONPMC>2.0.CO;2 PG 12 WC Meteorology & Atmospheric Sciences SC Meteorology & Atmospheric Sciences GA KR082 UT WOS:A1992KR08200004 ER PT J AU LOONEY, RE AF LOONEY, RE TI REAL OR ILLUSORY GROWTH IN AN OIL-BASED ECONOMY - GOVERNMENT EXPENDITURES AND PRIVATE-SECTOR INVESTMENT IN SAUDI-ARABIA SO WORLD DEVELOPMENT LA English DT Article AB The purpose of this paper is to determine whether and to what extent "Dutch Disease" effects have offset the potentially positive Hirschman-type inducements provided by massive government expenditures intended to stimulate private sector investment in Saudi Arabia. The main finding is that in Saudi Arabia at least infrastructure investment does not appear to have played a strong role in stimulating private sector investment. Instead, the private investors appear to be much more sensitive to shorter run current conditions created by government expenditures. RP LOONEY, RE (reprint author), USN,POSTGRAD SCH,MONTEREY,CA 93940, USA. NR 39 TC 4 Z9 4 U1 0 U2 2 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0305-750X J9 WORLD DEV JI World Dev. PD SEP PY 1992 VL 20 IS 9 BP 1367 EP 1375 DI 10.1016/0305-750X(92)90084-9 PG 9 WC Economics; Planning & Development SC Business & Economics; Public Administration GA JQ675 UT WOS:A1992JQ67500011 ER PT J AU PIESTRUP, MA BOYERS, DG PINCUS, CI LI, Q HO, AH MARUYAMA, XK SNYDER, DD SKOPIK, DM SILZER, RM MORAN, MJ ROTHBART, GB AF PIESTRUP, MA BOYERS, DG PINCUS, CI LI, Q HO, AH MARUYAMA, XK SNYDER, DD SKOPIK, DM SILZER, RM MORAN, MJ ROTHBART, GB TI OBSERVATION OF THE FOCUSING OF X-RAY TRANSITION RADIATION USING CYLINDRICAL OPTICS SO APPLIED PHYSICS LETTERS LA English DT Article ID MEDIUM-ENERGY ELECTRONS AB We have measured the profile of x rays generated by a transition radiator and focused by simple cylindrical optics. Soft x rays with photon energies between 1 and 4 keV were generated by a 93-MeV electron beam striking a stack of eight foils of 3.5-mu-m-thick mylar. These x rays were emitted in an annular cone and were collected by a quartz cylinder which focused the x rays to a 0.5-mm-diam spot at a distance of 1.35 m from the transition radiator. C1 USN,POSTGRAD SCH,MONTEREY,CA 93943. UNIV SASKATCHEWAN,SASKATCHEWAN ACCELERATOR LAB,SASKATOON S7N 0W0,SASKATCHEWAN,CANADA. LAWRENCE LIVERMORE NATL LAB,LIVERMORE,CA 94550. SOFTWARE SCI INC,BURLINGAME,CA 94005. RP PIESTRUP, MA (reprint author), ADELPHI TECHNOL INC,2181 PK BLVD,PALO ALTO,CA 94306, USA. NR 10 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 AUG 31 PY 1992 VL 61 IS 9 BP 1019 EP 1021 DI 10.1063/1.107702 PG 3 WC Physics, Applied SC Physics GA JK802 UT WOS:A1992JK80200003 ER PT J AU CUKAUSKAS, EJ ALLEN, LH SHERRILL, GK HOLM, RT AF CUKAUSKAS, EJ ALLEN, LH SHERRILL, GK HOLM, RT TI ROLE OF HYDROGEN IN THE GROWTH OF Y1BA2CU3O7 ON MGO SUBSTRATES BY OFF-AXIS MAGNETRON SPUTTERING SO APPLIED PHYSICS LETTERS LA English DT Article ID YBA2CU3O7 THIN-FILMS AB Y1Ba2Cu3O7 thin films have been grown on MgO by off-axis magnetron sputtering using mixtures of argon, oxygen, and hydrogen. Reduction in film transition temperature resulting from cumulative target sputtering time (target degradation) is minimized by adding hydrogen to the sputtering gas. Without hydrogen, new targets which had produced films with 87.5 K transition temperatures degraded with deposition time and produced films with transition temperatures of only 82 K. After addition of hydrogen, these targets produced films with transition temperatures of nearly 89 K. Critical-current densities for the films made at optimum hydrogen flow were greater than 3 X 10(6) A/cm2 at 4 K. With the addition of hydrogen, we observed a significant increase in the sputtergun cathode voltage and a dramatic increase in the deposition rate. The films were predominantly c-axis oriented, and we observed a minimum c-axis lattice parameter for optimum hydrogen flow. We attribute these improvements in material properties to the catalytic effect of hydrogen in maintaining atomic oxygen in the plasma, allowing more oxygen to be incorporated into the target and the film during growth. RP CUKAUSKAS, EJ (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 10 TC 11 Z9 11 U1 0 U2 0 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0003-6951 J9 APPL PHYS LETT JI Appl. Phys. Lett. PD AUG 31 PY 1992 VL 61 IS 9 BP 1125 EP 1127 DI 10.1063/1.107689 PG 3 WC Physics, Applied SC Physics GA JK802 UT WOS:A1992JK80200039 ER PT J AU GARFINKEL, A SPANO, ML DITTO, WL WEISS, JN AF GARFINKEL, A SPANO, ML DITTO, WL WEISS, JN TI CONTROLLING CARDIAC CHAOS SO SCIENCE LA English DT Article ID DYNAMICS; CELLS AB The extreme sensitivity to initial conditions that chaotic systems display makes them unstable and unpredictable. Yet that same sensitivity also makes them highly susceptible to control, provided that the developing chaos can be analyzed in real time and that analysis is then used to make small control interventions. This strategy has been used here to stabilize cardiac arrhythmias induced by the drug ouabain in rabbit ventricle. By administering electrical stimuli to the heart at irregular times determined by chaos theory, the arrhythmia was converted to periodic beating. C1 USN,CTR SURFACE WARFARE,SILVER SPRING,MD 20903. COLL WOOSTER,DEPT PHYS,WOOSTER,OH 44691. UNIV CALIF LOS ANGELES,DEPT MED CARDIOL,LOS ANGELES,CA 90024. RP GARFINKEL, A (reprint author), UNIV CALIF LOS ANGELES,DEPT PHYSIOL SCI,LOS ANGELES,CA 90024, USA. RI Spano, Mark/B-6883-2011; OI Ditto, William/0000-0002-7416-8012 FU NHLBI NIH HHS [KO4 HL01890, R01 HL36729, R01 HL44880] NR 23 TC 626 Z9 645 U1 2 U2 21 PU AMER ASSOC ADVANCEMENT SCIENCE PI WASHINGTON PA 1200 NEW YORK AVE, NW, WASHINGTON, DC 20005 SN 0036-8075 J9 SCIENCE JI Science PD AUG 28 PY 1992 VL 257 IS 5074 BP 1230 EP 1235 DI 10.1126/science.1519060 PG 6 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA JL050 UT WOS:A1992JL05000019 PM 1519060 ER PT J AU DAMODARAN, KV MERZ, KM GABER, BP AF DAMODARAN, KV MERZ, KM GABER, BP TI STRUCTURE AND DYNAMICS OF THE DILAUROYLPHOSPHATIDYLETHANOLAMINE LIPID BILAYER SO BIOCHEMISTRY LA English DT Article ID PHOSPHATIDYLCHOLINE MODEL MEMBRANES; DEUTERIUM MAGNETIC-RESONANCE; MOLECULAR-DYNAMICS; MONTE-CARLO; PROTEIN INTERACTIONS; NEUTRON-DIFFRACTION; LIQUID-CRYSTAL; CONFORMATION; SIMULATION; CHAIN AB A 200-ps molecular dynamics (MD) simulation trajectory of a model dilauroylphosphatidylethanolamine (DLPE) bilayer in water at 315 K has been generated. Segmental order parameters, electron density profiles, and water pair distribution functions have been calculated. Comparison to experiment is made where possible. The dynamics of the system has been studied by analyzing the velocity autocorrelation functions (VAF) of both water and lipid atoms. Furthermore, the diffusive properties of water have been analyzed by computing the mean square displacement (MSD) and orientational correlation function (OCF) of water in two regions around the bilayer. The calculated order parameters show a behavior similar to the liquid crystalline phase of other bilayers, but the region around C1-C3 does not show the expected behavior. The electron density profile shows features that are characteristic of the liquid crystalline phase. The radial distribution functions suggest ordering of water near the charged head groups, which results in about 15 water molecules solvating each lipid molecule. We find from the VAF, MSD, and OCF calculation that the water molecules near the head groups of the lipid bilayer move more slowly than those further away. The VAF of the hydrocarbon chains have features of low-frequency motions that are probably cooperative nature in addition to the high-frequency motions associated with bond angle and torsional motions. C1 PENN STATE UNIV,DEPT CHEM,UNIV PK,PA 16802. USN,RES LAB,CTR BIOMOLEC SCI & ENGN,WASHINGTON,DC 20375. NR 50 TC 98 Z9 99 U1 0 U2 2 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0006-2960 J9 BIOCHEMISTRY-US JI Biochemistry PD AUG 25 PY 1992 VL 31 IS 33 BP 7656 EP 7664 DI 10.1021/bi00148a029 PG 9 WC Biochemistry & Molecular Biology SC Biochemistry & Molecular Biology GA JK533 UT WOS:A1992JK53300029 PM 1510951 ER PT J AU ROSS, MM MOWREY, RC CALLAHAN, JH MCELVANY, SW AF ROSS, MM MOWREY, RC CALLAHAN, JH MCELVANY, SW TI FORMATION AND CHARACTERIZATION OF FULLERENE ENDOHEDRAL COMPLEXES SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 USN,RES LAB,DIV CHEM,WASHINGTON,DC 20375. NR 0 TC 0 Z9 0 U1 0 U2 1 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 23 PY 1992 VL 204 BP 9 EP PHYS PN 2 PG 0 WC Chemistry, Multidisciplinary SC Chemistry GA JJ313 UT WOS:A1992JJ31300678 ER PT J AU LOWREY, AH FAMINI, GR AF LOWREY, AH FAMINI, GR TI THEORETICAL DESCRIPTORS FOR THE POTENCY OF SUBSTITUTED COCAINE SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 USA,CRDEC,ABERDEEN PROVING GROUND,MD 21010. USN,RES LAB,STRUCT MATTER LAB,WASHINGTON,DC 20375. NR 6 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 23 PY 1992 VL 204 BP 18 EP COMP PN 1 PG 0 WC Chemistry, Multidisciplinary SC Chemistry GA JJ312 UT WOS:A1992JJ31201241 ER PT J AU SAAVEDRA, JE DUNAMS, TM FLIPPENANDERSON, JL KEEFER, LK AF SAAVEDRA, JE DUNAMS, TM FLIPPENANDERSON, JL KEEFER, LK TI ELECTROPHILIC ADDITION TO AMINONONOATE [R1R2NN(O)NO-] IONS SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 NCI,FREDERICK,MD 21702. USN,RES LAB,WASHINGTON,DC 20375. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 23 PY 1992 VL 204 BP 27 EP AGFD PN 1 PG 0 WC Chemistry, Multidisciplinary SC Chemistry GA JJ312 UT WOS:A1992JJ31200027 ER PT J AU JONESMEEHAN, J WALCH, M LITTLE, BJ RAY, RI MANSFELD, FB AF JONESMEEHAN, J WALCH, M LITTLE, BJ RAY, RI MANSFELD, FB TI EFFECT OF MIXED SULFATE-REDUCING BACTERIAL COMMUNITIES ON COATINGS SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 USN,CTR SURFACE WARFARE,SILVER SPRING,MD 20903. USN,OCEANOG ATMOSPHER RES LAB,BAY ST LOUIS,MS 39529. UNIV SO CALIF,DEPT MAT SCI,LOS ANGELES,CA 90089. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 23 PY 1992 VL 204 BP 32 EP IEC PN 1 PG 0 WC Chemistry, Multidisciplinary SC Chemistry GA JJ312 UT WOS:A1992JJ31201764 ER PT J AU CARHART, H AF CARHART, H TI IMPACT OF LOW OXYGEN SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 USN,RES LAB,TECH CTR SAFETY & SURVIVABIL,WASHINGTON,DC 20375. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 23 PY 1992 VL 204 BP 43 EP CHAS PN 1 PG 0 WC Chemistry, Multidisciplinary SC Chemistry GA JJ312 UT WOS:A1992JJ31200824 ER PT J AU LITTLE, BJ WAGNER, PA AF LITTLE, BJ WAGNER, PA TI INDICATORS OF MICROBIOLOGICALLY INFLUENCED CORROSION SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 USN,RES LAB,BAY ST LOUIS,MS 39529. NR 0 TC 0 Z9 0 U1 0 U2 2 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 23 PY 1992 VL 204 BP 49 EP IEC PN 1 PG 0 WC Chemistry, Multidisciplinary SC Chemistry GA JJ312 UT WOS:A1992JJ31201776 ER PT J AU HONEYCHUCK, RV CRUGER, TW AF HONEYCHUCK, RV CRUGER, TW TI BEER LAW BEHAVIOR OF BUCKMINSTERFULLERENE SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 USN,RES LAB,MAT CHEM BRANCH,WASHINGTON,DC 20375. GEORGE MASON UNIV,DEPT CHEM,FAIRFAX,VA 22030. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 23 PY 1992 VL 204 BP 59 EP ORGN PN 2 PG 0 WC Chemistry, Multidisciplinary SC Chemistry GA JJ313 UT WOS:A1992JJ31300185 ER PT J AU FLIPPENANDERSON, JL GEORGE, C WARD, KB HOUGHTEN, RA CUDNEY, B AF FLIPPENANDERSON, JL GEORGE, C WARD, KB HOUGHTEN, RA CUDNEY, B TI X-RAY-DIFFRACTION ANALYSIS OF 2 OPIOID-PEPTIDES - DTLET AND DPDPE SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 USN,RES LAB,WASHINGTON,DC 20375. MULTIPLE PEPTIDE SYST,SAN DIEGO,CA 92121. HAMPTON RES,RIVERSIDE,CA 92507. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 23 PY 1992 VL 204 BP 74 EP MEDI PN 1 PG 0 WC Chemistry, Multidisciplinary SC Chemistry GA JJ312 UT WOS:A1992JJ31202432 ER PT J AU CHRISTODOULOU, D WINK, DA GEORGE, C SAAVEDRA, JE KEEFER, LK AF CHRISTODOULOU, D WINK, DA GEORGE, C SAAVEDRA, JE KEEFER, LK TI NITRIC-OXIDE NUCLEOPHILE COMPLEXES AS LIGANDS - STRUCTURAL ASPECTS OF THE COORDINATED NONOATE FUNCTIONAL-GROUP IN NOVEL MIXED-LIGAND, NONNITROSYL METAL-COMPLEXES SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 NCI,FREDERICK,MD 21702. USN,RES LAB,WASHINGTON,DC 20375. NR 0 TC 0 Z9 0 U1 0 U2 1 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 23 PY 1992 VL 204 BP 97 EP AGFD PN 1 PG 0 WC Chemistry, Multidisciplinary SC Chemistry GA JJ312 UT WOS:A1992JJ31200097 ER PT J AU SHADE, JE PEARSON, WH HANSEN, JA BITTERWOLF, TE AF SHADE, JE PEARSON, WH HANSEN, JA BITTERWOLF, TE TI PHOTOCHEMISTRY OF [CPFE(CO)]2-U-DPPX, WHERE DPPX = DPPM, DPPE OR DPPP - AN UNEXPECTED RADICAL REACTION ROUTE SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 USN ACAD,DEPT CHEM,ANNAPOLIS,MD 21402. UNIV IDAHO,DEPT CHEM,MOSCOW,ID 83843. NR 0 TC 0 Z9 0 U1 1 U2 1 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 23 PY 1992 VL 204 BP 135 EP INOR PN 1 PG 0 WC Chemistry, Multidisciplinary SC Chemistry GA JJ312 UT WOS:A1992JJ31201986 ER PT J AU RICE, JK BARONAVSKI, AP AF RICE, JK BARONAVSKI, AP TI ULTRAFAST STUDIES OF SOLVENT EFFECTS IN THE ISOMERIZATION OF CIS-STILBENE SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 USN,RES LAB,WASHINGTON,DC 20375. NR 0 TC 0 Z9 0 U1 1 U2 2 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 23 PY 1992 VL 204 BP 141 EP PHYS PN 2 PG 0 WC Chemistry, Multidisciplinary SC Chemistry GA JJ313 UT WOS:A1992JJ31300810 ER PT J AU MCCAULEY, SW BARONAVSKI, AP RICE, JK GHIRARDI, ML MATTOO, AK AF MCCAULEY, SW BARONAVSKI, AP RICE, JK GHIRARDI, ML MATTOO, AK TI ULTRAFAST TRANSIENT ABSORPTION BY PHOTOSYSTEM-II REACTION CENTERS SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 USN,RES LAB,WASHINGTON,DC 20375. CALIF STATE POLYTECH UNIV POMONA,POMONA,CA 91768. USDA ARS,BELTSVILLE AGR RES CTR,BELTSVILLE,MD 20705. RI Mattoo, Autar/G-9863-2011 NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 23 PY 1992 VL 204 BP 142 EP PHYS PN 2 PG 0 WC Chemistry, Multidisciplinary SC Chemistry GA JJ313 UT WOS:A1992JJ31300811 ER PT J AU BRADY, RF CHARLESWORTH, JM AF BRADY, RF CHARLESWORTH, JM TI INFLUENCE OF WATER ON THE REACTION BETWEEN AMIDOAMINE AND EPOXY-RESINS SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 USN,RES LAB,WASHINGTON,DC 20375. MAT RES LAB,ASCOT,VIC 3032,AUSTRALIA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 23 PY 1992 VL 204 BP 147 EP PMSE PN 2 PG 0 WC Chemistry, Multidisciplinary SC Chemistry GA JJ313 UT WOS:A1992JJ31301100 ER PT J AU GEORGE, RD SNOW, AW MCMILLAN, PF BURROWS, VA AF GEORGE, RD SNOW, AW MCMILLAN, PF BURROWS, VA TI PREPARATION OF NOVEL SUBSTITUTED METAL PHTHALOCYANINES - SILVER AND MERCURY TETRAKIS(CUMYLPHENOXY) PHTHALOCYANINES SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 ARIZONA STATE UNIV,DEPT CHEM,TEMPE,AZ 85287. ARIZONA STATE UNIV,DEPT BIOCHEM,TEMPE,AZ 85287. ARIZONA STATE UNIV,CTR CHEM BIO & MAT ENGN,TEMPE,AZ 85287. USN,RES LAB,WASHINGTON,DC 20375. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 23 PY 1992 VL 204 BP 168 EP INOR PN 1 PG 0 WC Chemistry, Multidisciplinary SC Chemistry GA JJ312 UT WOS:A1992JJ31202019 ER PT J AU ROLAND, CM TOMLIN, DW AF ROLAND, CM TOMLIN, DW TI ENDOTHERMIC MIXING IN A VANDERWAALS POLYMER BLEND SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 USN,RES LAB,WASHINGTON,DC 20375. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 23 PY 1992 VL 204 BP 174 EP PMSE PN 2 PG 0 WC Chemistry, Multidisciplinary SC Chemistry GA JJ313 UT WOS:A1992JJ31301127 ER PT J AU MCCLEAN, RE PASTERNACK, L AF MCCLEAN, RE PASTERNACK, L TI KINETICS OF THE REACTIONS V(A4F3/2,A6D3/2)+XO(X=O,N, AND CO) SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 USN,RES LAB,NRC,DIV CHEM,WASHINGTON,DC 20375. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 23 PY 1992 VL 204 BP 176 EP PHYS PN 2 PG 0 WC Chemistry, Multidisciplinary SC Chemistry GA JJ313 UT WOS:A1992JJ31300845 ER PT J AU MEDHURST, LJ GARLAND, NL NELSON, HH AF MEDHURST, LJ GARLAND, NL NELSON, HH TI CH+ N-2 - TEMPERATURE-DEPENDENCE OF THE KINETICS SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 USN,RES LAB,DIV CHEM,WASHINGTON,DC 20375. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 23 PY 1992 VL 204 BP 177 EP PHYS PN 2 PG 0 WC Chemistry, Multidisciplinary SC Chemistry GA JJ313 UT WOS:A1992JJ31300846 ER PT J AU DULCEY, CS GEORGER, JH DRESSICK, WJ KOLOSKI, TS CALVERT, JM AF DULCEY, CS GEORGER, JH DRESSICK, WJ KOLOSKI, TS CALVERT, JM TI DEEP ULTRAVIOLET PHOTOCHEMISTRY OF CHEMISORBED MONOLAYERS SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 USN,RES LAB,CTR BIOMOLEC SCI & ENGN,WASHINGTON,DC 20375. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 23 PY 1992 VL 204 BP 194 EP PHYS PN 2 PG 0 WC Chemistry, Multidisciplinary SC Chemistry GA JJ313 UT WOS:A1992JJ31300863 ER PT J AU BUCKLEY, LJ DUDECK, KE AF BUCKLEY, LJ DUDECK, KE TI STABILITY OF R-BAND COMPLEX DIELECTRIC-PROPERTIES OF POLYANILINE SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 USN,CTR WARFARE,DIV AIRCRAFT,POLYMER PHYS GRP,WARMINSTER,PA 18974. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 23 PY 1992 VL 204 BP 226 EP POLY PN 2 PG 0 WC Chemistry, Multidisciplinary SC Chemistry GA JJ313 UT WOS:A1992JJ31301422 ER PT J AU HO, T WYNNE, KJ AF HO, T WYNNE, KJ TI POLYDIMETHYLSILOXANE UREA URETHANE COPOLYMERS WITH 1,4-BENZENEDIMETHANOL AS CHAIN EXTENDER SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 USN,RES LAB,MAT CHEM BRANCH,WASHINGTON,DC 20375. OFF NAVAL RES,DIV CHEM,ARLINGTON,VA 22217. GEORGE MASON UNIV,DEPT CHEM,FAIRFAX,VA 22030. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 23 PY 1992 VL 204 BP 233 EP PMSE PN 2 PG 0 WC Chemistry, Multidisciplinary SC Chemistry GA JJ313 UT WOS:A1992JJ31301186 ER PT J AU FLOM, SR SHIRK, JS BARTOLI, FJ LINDLE, JR PONG, RGS SNOW, AW AF FLOM, SR SHIRK, JS BARTOLI, FJ LINDLE, JR PONG, RGS SNOW, AW TI THE NONLINEAR SPECTROSCOPY OF SMALL PHTHALOCYANINE AGGREGATES IN SOLUTION SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 USN,RES LAB,DIV OPT SCI,WASHINGTON,DC 20375. RI Lindle, James/A-9426-2009 NR 0 TC 0 Z9 0 U1 0 U2 1 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 23 PY 1992 VL 204 BP 235 EP PHYS PN 2 PG 0 WC Chemistry, Multidisciplinary SC Chemistry GA JJ313 UT WOS:A1992JJ31300904 ER PT J AU CHEEK, GT AF CHEEK, GT TI ELECTROCHEMICAL REDUCTION OF AROMATIC KETONES IN A ROOM-TEMPERATURE MOLTEN-SALT SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 USN ACAD,DEPT CHEM,ANNAPOLIS,MD 21402. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 23 PY 1992 VL 204 BP 236 EP ORGN PN 2 PG 0 WC Chemistry, Multidisciplinary SC Chemistry GA JJ313 UT WOS:A1992JJ31300362 ER PT J AU HENDERSHOT, DG BERRY, AD AF HENDERSHOT, DG BERRY, AD TI SYNTHESIS AND PROPERTIES OF THE PRIMARY AND SECONDARY TRIMETHYLSILYLMETHYLSTIBINES SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 USN,RES LAB,MAT CHEM BRANCH,WASHINGTON,DC 20375. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 23 PY 1992 VL 204 BP 243 EP INOR PN 1 PG 0 WC Chemistry, Multidisciplinary SC Chemistry GA JJ312 UT WOS:A1992JJ31202094 ER PT J AU LEE, KE GEDRIDGE, RW HIGA, KT AF LEE, KE GEDRIDGE, RW HIGA, KT TI THE SYNTHESIS AND PYROLYSIS STUDIES OF (I-PR)2SBH SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 USN,CTR AIR WARFARE,DIV WEAP,RES DEPT,DIV CHEM,CHINA LAKE,CA 93555. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 23 PY 1992 VL 204 BP 249 EP INOR PN 1 PG 0 WC Chemistry, Multidisciplinary SC Chemistry GA JJ312 UT WOS:A1992JJ31202100 ER PT J AU MERA, AE AF MERA, AE TI SYNTHESIS AND CHARACTERIZATION OF ACETYLENE TERMINATED RESINS CONTAINING NAPHTHALENE AND ANTHRACENE UNITS SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 USN,RES LAB,WASHINGTON,DC 20375. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 23 PY 1992 VL 204 BP 270 EP POLY PN 2 PG 0 WC Chemistry, Multidisciplinary SC Chemistry GA JJ313 UT WOS:A1992JJ31301466 ER PT J AU COLMENERO, J ALEGRIA, A ROLAND, CM NGAI, KL AF COLMENERO, J ALEGRIA, A ROLAND, CM NGAI, KL TI DIELECTRIC-SPECTROSCOPY OF PIP PVE BLENDS SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 UNIV BASQUE COUNTRY, DEPT PHYS MAT, SAN SEBASTIAN, SPAIN. USN, RES LAB, WASHINGTON, DC 20375 USA. RI Colmenero, Juan/G-8725-2015; ALEGRIA, ANGEL/H-1035-2015 OI Colmenero, Juan/0000-0002-2440-4953; ALEGRIA, ANGEL/0000-0001-6125-8214 NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 23 PY 1992 VL 204 BP 331 EP POLY PN 2 PG 0 WC Chemistry, Multidisciplinary SC Chemistry GA JJ313 UT WOS:A1992JJ31301527 ER PT J AU LOMAX, JF PATRICK, KM PEARSON, W WINTERSGILL, MC FONTANELLA, JJ AF LOMAX, JF PATRICK, KM PEARSON, W WINTERSGILL, MC FONTANELLA, JJ TI GROUP-IV ION-EXCHANGE PRODUCTS OF BETA''-ALUMINA - SYNTHESIS AND CHARACTERIZATION SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 USN ACAD,DEPT CHEM,ANNAPOLIS,MD 21402. USN ACAD,DEPT PHYS,ANNAPOLIS,MD 21402. NR 0 TC 0 Z9 0 U1 0 U2 1 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 23 PY 1992 VL 204 BP 368 EP INOR PN 1 PG 0 WC Chemistry, Multidisciplinary SC Chemistry GA JJ312 UT WOS:A1992JJ31202219 ER PT J AU HECKENDORN, DK MOHS, JC AF HECKENDORN, DK MOHS, JC TI APPLICATIONS OF MOLECULAR MECHANICS TO TRANSITION-STATE MODELING FOR AN INTRAMOLECULAR CYCLIZATION SO ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY LA English DT Meeting Abstract C1 USN ACAD,DEPT CHEM,ENS,ANNAPOLIS,MD 21402. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0065-7727 J9 ABSTR PAP AM CHEM S JI Abstr. Pap. Am. Chem. Soc. PD AUG 23 PY 1992 VL 204 BP 389 EP ORGN PN 2 PG 0 WC Chemistry, Multidisciplinary SC Chemistry GA JJ313 UT WOS:A1992JJ31300515 ER PT J AU APRUZESE, J DAVIS, J AF APRUZESE, J DAVIS, J TI ULTRASHORT WAVELENGTH LASERS - AN INTRODUCTION SO APPLIED OPTICS LA English DT Editorial Material RP APRUZESE, J (reprint author), USN,RES LABS,RADIAT HYDRODYNAM BRANCH,4555 OVERLOOK AVE SW,WASHINGTON,DC 20375, USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU OPTICAL SOC AMER PI WASHINGTON PA 2010 MASSACHUSETTS AVE NW, WASHINGTON, DC 20036 SN 0003-6935 J9 APPL OPTICS JI Appl. Optics PD AUG 20 PY 1992 VL 31 IS 24 BP 4929 EP 4930 PG 2 WC Optics SC Optics GA JJ472 UT WOS:A1992JJ47200013 PM 20733652 ER PT J AU THORNHILL, JW DAVIS, J APRUZESE, JP CLARK, R AF THORNHILL, JW DAVIS, J APRUZESE, JP CLARK, R TI IMPROVING PLASMA UNIFORMITY IN Z-PINCH-DRIVEN NEON-LIKE KRYPTON X-RAY LASERS SO APPLIED OPTICS LA English DT Article DE X-RAY LASER; NEON-LIKE KRYPTON; PLASMA UNIFORMITY ID DIELECTRONIC RECOMBINATION; ESCAPE PROBABILITIES; LEVEL POPULATIONS; ELECTRON-IMPACT; RADIATION; IONS; IMPLOSIONS; EXCITATION; IONIZATION AB Maintaining plasma uniformity is an essential requirement for successful x-ray laser designs. In this work we focus on a Z-pinch-driven neonlike krypton x-ray laser design for which we (1) investigate the role of initial mass loading in affecting plasma uniformity and gain and (2) show that there are advantages in terms of plasma uniformity to diluting a krypton plasma with a low-Z material such as helium. These results are obtained by using a one-dimensional radiation hydrodynamic model. The results of this study show that low-mass 100% krypton plasmas are optimal for achieving significant gain while maintaining plasma integrity. Diluting a krypton plasma with helium has the advantage of improving plasma uniformity, but it has the disadvantages of enhanced collisionality and line broadening, which are associated with the additional free electrons. RP THORNHILL, JW (reprint author), USN,RES LAB,DIV PLASMA PHYS,RADIAT HYDRODYNAM BRANCH,4555 OVERLOOK AVE SW,WASHINGTON,DC 20375, USA. NR 31 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 AUG 20 PY 1992 VL 31 IS 24 BP 4940 EP 4949 PG 10 WC Optics SC Optics GA JJ472 UT WOS:A1992JJ47200015 PM 20733654 ER PT J AU ZHU, X SUMMERS, ME STROBEL, DF AF ZHU, X SUMMERS, ME STROBEL, DF TI CALCULATION OF CO2 15-MU-M BAND ATMOSPHERIC COOLING RATES BY CURTIS MATRIX INTERPOLATION OF CORRELATED-K COEFFICIENTS SO JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES LA English DT Article ID RADIATION CALCULATIONS; ABSORPTION; PARAMETERS; MESOSPHERE; ALGORITHM; MODELS AB A fast, yet accurate algorithm for calculating CO2 15-mu-m band cooling rates by Curtis matrix interpolation is presented based on a computationally efficient method to compute correlated-k coefficients in an inhomogeneous atmosphere for any spacing in pressure levels and variation Of CO2 mixing ratio. The algorithm produces an error in cooling rate of less than 4% in the region where the radiative processes play a major role. This algorithm is easy to use and can be readily adopted for use in general circulation models of the Earth's atmosphere. C1 USN,RES LAB,CTR SPACE RES,WASHINGTON,DC 20375. RP ZHU, X (reprint author), JOHNS HOPKINS UNIV,DEPT EARTH & PLANETARY SCI,BALTIMORE,MD 21218, USA. RI Zhu, Xun/C-2097-2016 OI Zhu, Xun/0000-0001-7860-6430 NR 21 TC 23 Z9 23 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-ATMOS JI J. Geophys. Res.-Atmos. PD AUG 20 PY 1992 VL 97 IS D12 BP 12787 EP 12797 PG 11 WC Meteorology & Atmospheric Sciences SC Meteorology & Atmospheric Sciences GA JL282 UT WOS:A1992JL28200002 ER PT J AU PACE, MD CHRISTIDIS, TC YIN, JJ MILLIKEN, J AF PACE, MD CHRISTIDIS, TC YIN, JJ MILLIKEN, J TI EPR OF A FREE-RADICAL IN C-60 - EFFECT OF O2 SO JOURNAL OF PHYSICAL CHEMISTRY LA English DT Letter ID ELECTRON-SPIN-RESONANCE; PARAMAGNETIC-RES; BUCKMINSTERFULLERENE; COALS AB An EPR (electron paramagnetic resonance) signal was detected in C60 powder (10(-4) radical-to-C60 ratio) and studied by multifrequency (S-, X-, and Q-band) EPR using loop-gap resonators. The signal intensity is dependent on O2 as demonstrated by spectra recorded from N2/O2 gas flow experiments, vacuum-evacuated (10(-4) Torr) C60 samples, and C60 heated in air at 250-degrees-C. C1 USN,RES LAB,DIV CHEM,WASHINGTON,DC 20375. RP PACE, MD (reprint author), MED COLL WISCONSIN,NATL BIOMED ESR CTR,MILWAUKEE,WI 53226, USA. RI Yin, Jun Jie /E-5619-2014 NR 22 TC 34 Z9 34 U1 1 U2 5 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0022-3654 J9 J PHYS CHEM-US JI J. Phys. Chem. PD AUG 20 PY 1992 VL 96 IS 17 BP 6855 EP 6858 DI 10.1021/j100196a001 PG 4 WC Chemistry, Physical SC Chemistry GA JK807 UT WOS:A1992JK80700001 ER PT J AU BRYANT, PH CARROLL, TL PECORA, LM RACHFORD, FJ AF BRYANT, PH CARROLL, TL PECORA, LM RACHFORD, FJ TI SUBSATURATION FERROMAGNETIC-RESONANCE IN YTTRIUM-IRON-GARNET SPHERES SO APPLIED PHYSICS LETTERS LA English DT Article AB Experimental data is presented for ferromagnetic resonance in an yttrium iron garnet sphere slightly below the threshold field for saturation. It is found that significantly different behavior occurs depending on whether the dc field is aligned with the [111], [100], or [110] axes of the crystal. Explanations are proposed to account for the observed behavior, which in the [100] and [110] cases involve the formation of macroscopic magnetization patterns. These two cases also exhibit frequency reversal below threshold, in which the frequency is observed to increase as the field is decreased. C1 LAWRENCE BERKELEY LAB,DIV MAT SCI,BERKELEY,CA 94720. USN,RES LAB,WASHINGTON,DC 20375. RP BRYANT, PH (reprint author), UNIV CALIF BERKELEY,DEPT PHYS,BERKELEY,CA 94720, USA. OI Carroll, Thomas/0000-0002-2371-2049 NR 7 TC 0 Z9 0 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 AUG 17 PY 1992 VL 61 IS 7 BP 864 EP 866 DI 10.1063/1.107771 PG 3 WC Physics, Applied SC Physics GA JJ366 UT WOS:A1992JJ36600044 ER PT J AU PARENT, DC AF PARENT, DC TI FORMATION OF SILICON-CARBIDE CLUSTER CATIONS AND THEIR REACTION WITH ACETYLENE - UNUSUAL BEHAVIOR OF THE DISILICON CARBIDE IONS SO INTERNATIONAL JOURNAL OF MASS SPECTROMETRY AND ION PROCESSES LA English DT Article DE SILICON CARBIDE CATION CLUSTERS; KINETICS ID CARBON-CHAIN MOLECULES; GAS-PHASE REACTIONS; LASER VAPORIZATION; VIBRATIONAL FREQUENCIES; SMALL HYDROCARBONS; MASS-SPECTROMETRY; SIC POWDERS; SPECTRUM; SPECTROSCOPY; SI2C AB Formation of silicon carbide cation clusters (SiC(y)+, y = 0-12 and Si2Cy+, y = 0-11) by direct laser vaporization is reported. The reactions with acetylene were studied in a Fourier transform ion cyclotron resonance mass spectrometer, and product branching ratios and rate constants are tabulated. Monosilicon carbide cations react similarly to pure carbon clusters to add C2H at a rate approximately half Langevin. These results are interpreted as favoring a linear Si-C(y)+ structure possessing a reactive carbene site. Disilicon carbide cations exhibit unusual non-linear kinetics: at first reacting slowly to add CH2, followed by an increase in reactivity and adduct formation. Carbon-13 labeling studies reveal that the Si2Cy+ (y > l) reactant ions undergo carbon exchange with acetylene, catalyzing cleavage of the carbon-carbon triple bond! RP PARENT, DC (reprint author), USN,RES LAB,DIV CHEM,CODE 6113,WASHINGTON,DC 20375, USA. NR 57 TC 18 Z9 18 U1 0 U2 3 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-1176 J9 INT J MASS SPECTROM JI Int. J. Mass Spectrom. Ion Process. PD AUG 17 PY 1992 VL 116 IS 3 BP 257 EP 271 DI 10.1016/0168-1176(92)80044-2 PG 15 WC Physics, Atomic, Molecular & Chemical; Spectroscopy SC Physics; Spectroscopy GA JL783 UT WOS:A1992JL78300006 ER PT J AU GEORGE, C GILARDI, R FLIPPENANDERSON, JL AF GEORGE, C GILARDI, R FLIPPENANDERSON, JL TI STRUCTURE OF 7-ACETYL-2,5.9-TRINITRO-2,5,7,9-TETRAAZABICYCLO[4.3.0]NONAN-8-ONE SO ACTA CRYSTALLOGRAPHICA SECTION C-CRYSTAL STRUCTURE COMMUNICATIONS LA English DT Note AB C7H9N7O8, M(r) = 319.2, monoclinic, P2(1)/n, a = 10.615 (1), b = 9.115 (2), c = 12.948 (2) angstrom, beta = 108.57 (1)-degrees, V = 1187.6 (3) angstrom3, Z = 4, D(x) = 1.785 Mg m-3, lambda(Cu K-alpha) = 1.54184 angstrom, mu = 1.38mm-1, F(000) = 656, T = 295 K, final R = 0.039, wR = 0.044 for 1327 independent observed reflections. The five-membered ring has a normal envelope conformation while the six-membered ring has adopted a twisted boat conformation. Of the three nitroamine groups one is planar and the other two are pyramidal with N-N to C-N-C angles of 0.5, 43.4 and 44.8-degrees respectively. RP GEORGE, C (reprint author), USN,RES LAB,STRUCT MATTER LAB,WASHINGTON,DC 20375, USA. NR 2 TC 5 Z9 5 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 AUG 15 PY 1992 VL 48 BP 1527 EP 1528 DI 10.1107/S0108270191014956 PN 8 PG 2 WC Chemistry, Multidisciplinary; Crystallography SC Chemistry; Crystallography GA JL206 UT WOS:A1992JL20600064 ER PT J AU GILARDI, R GEORGE, C FLIPPENANDERSON, JL AF GILARDI, R GEORGE, C FLIPPENANDERSON, JL TI STRUCTURES OF (I) 6-NITRO-2,4-DIPROPIONYL-8-OXA-2,4,6-TRIAZABICYCLO[3.3.0]OCTANE AND (II) 2,4-DIACETYL-6-NITRO-8-OXA-2,4,6-TRIAZABICYCLO[3.3.0]OCTANE SO ACTA CRYSTALLOGRAPHICA SECTION C-CRYSTAL STRUCTURE COMMUNICATIONS LA English DT Note AB (I) C10H16N4O5, M(r) = 272.3, monoclinic, P2(1)/n, a = 6.151 (2), b = 13.484 (7), c = 15.165 (9) angstrom, beta = 90.94 (5)-degrees, V = 1257.6 (9) angstrom3, Z = 4, D(x) = 1.438 Mg m-3, lambda(Mo K-alpha) = 0.71073 angstrom, mu = 0.11 mm-1, F(000) = 576, T = 295 K, final R = 0.046, wR = 0.038 for 1274 independent observed reflections. (II) C8H12N4O5, M(r) = 244.2, monoclinic, P2(1)/c, a = 7.801 (1), b = 19.885 (3), c = 7.077 (1) angstrom, beta = 91.35 (2)-degrees, V = 1097.5 (3) angstrom3, Z = 4, D(x) = 1.478 Mg m-3, lambda(Cu K-alpha) = 1.54178 angstrom, mu = 1.02 mm-1, F(000) = 512, T = 295 K, final R = 0.039, wR = 0.051 for 1718 independent observed reflections. In (I) both rings have an envelope conformation while in (II) the acetyl substituted ring is planar. The nitroamine group is pyramidal in both molecules with an N-N to C-N-C angle of 43.1 in (I) and 42.6-degrees in (II). In (I) the carbonyl O atoms of the propionyl groups are on opposite sides of the C-N-C-N-C chain whereas in (II) the acetyl carbonyls are on the same side of the chain. RP GILARDI, R (reprint author), USN,RES LAB,STRUCT MATTER LAB,WASHINGTON,DC 20375, USA. NR 3 TC 3 Z9 3 U1 0 U2 0 PU MUNKSGAARD INT PUBL LTD PI COPENHAGEN PA 35 NORRE SOGADE, PO BOX 2148, DK-1016 COPENHAGEN, DENMARK SN 0108-2701 J9 ACTA CRYSTALLOGR C JI Acta Crystallogr. Sect. C-Cryst. Struct. Commun. PD AUG 15 PY 1992 VL 48 BP 1528 EP 1530 DI 10.1107/S0108270191014944 PN 8 PG 3 WC Chemistry, Multidisciplinary; Crystallography SC Chemistry; Crystallography GA JL206 UT WOS:A1992JL20600065 ER PT J AU FLIPPENANDERSON, JL GEORGE, C GILARDI, R AF FLIPPENANDERSON, JL GEORGE, C GILARDI, R TI STRUCTURE OF 2,4,6-TRINITRO-8,10-DIPROPIONYL-2,4,6,8,10-PENTAAZABICYCLO[5.3.0]DECANE SO ACTA CRYSTALLOGRAPHICA SECTION C-CRYSTAL STRUCTURE COMMUNICATIONS LA English DT Note AB C11H18N8O8, M(r) = 390.3, orthorhombic, Pbca, a = 6.552 (2), b 25.794 (6), c = 19.412 (5) angstrom, V = 3281 (2) angstrom3, Z = 8, D(x) = 1.581 Mg m-3, lambda(Cu K-alpha) = 1.54184 angstrom, mu = 1.12 mm-1, F(000) = 1632, T = 295 K, final R = 0.054, wR = 0.055 for 1481 independent observed reflections. The five-membered ring is essentially planar while the seven-membered ring has adopted a chair conformation. All three nitro groups are pyramidal with N-N to C-N-C angles of 19.8, 28.6 and 29.5-degrees. RP FLIPPENANDERSON, JL (reprint author), USN,RES LAB,STRUCT MATTER LAB,WASHINGTON,DC 20375, USA. NR 2 TC 3 Z9 3 U1 0 U2 0 PU MUNKSGAARD INT PUBL LTD PI COPENHAGEN PA 35 NORRE SOGADE, PO BOX 2148, DK-1016 COPENHAGEN, DENMARK SN 0108-2701 J9 ACTA CRYSTALLOGR C JI Acta Crystallogr. Sect. C-Cryst. Struct. Commun. PD AUG 15 PY 1992 VL 48 BP 1530 EP 1531 DI 10.1107/S0108270191015123 PN 8 PG 2 WC Chemistry, Multidisciplinary; Crystallography SC Chemistry; Crystallography GA JL206 UT WOS:A1992JL20600066 ER PT J AU GILARDI, R GEORGE, C FLIPPENANDERSON, JL AF GILARDI, R GEORGE, C FLIPPENANDERSON, JL TI STRUCTURE OF 6,8-DIACETYL-2,4-DINITRO-2,4,6,8-TETRAAZABICYCLO[3.3.0]OCTANE SO ACTA CRYSTALLOGRAPHICA SECTION C-CRYSTAL STRUCTURE COMMUNICATIONS LA English DT Note AB C8H12N6O6, M(r) = 288.22, orthorhombic, P2(1)2(1)2(1), a = 8.482 (1), b = 11.844 (2), c = 11.943 (2) angstrom, V = 1199.8 (4) angstrom3, Z = 4, D(x) = 1. 596 Mg m-3, lambda(Cu Ka) = 1.54184 angstrom, mu = 1.15 mm-1, F(000) = 600, T = 295 K, final R = 0.035, wR = 0.046 for 1092 independent observed reflections. This bicyclic heterocycle has a cis ring junction, and ring torsions centered about the shared bond are nearly eclipsed (17.0 and 18.8-degrees). The acetyl groups are disposed asymmetrically across the pseudo-mirror plane of the molecule, with the carbonyl of one pointing towards, and that of the other pointing away from the ring junction. The amino N atoms vary in hybridization. The two acetylated amines are nearly trigonal planar, with the N-C(keto) bonds bent only 6.9 and 7.6-degrees from the adjacent C-N-C planes, while the two nitroamines are nearly tetrahedral, with their N-N bonds bent 31.0 and 31.9-degrees from adjacent C-N-C planes. RP GILARDI, R (reprint author), USN,RES LAB,STRUCT MATTER LAB,WASHINGTON,DC 20375, USA. NR 3 TC 4 Z9 4 U1 0 U2 1 PU MUNKSGAARD INT PUBL LTD PI COPENHAGEN PA 35 NORRE SOGADE, PO BOX 2148, DK-1016 COPENHAGEN, DENMARK SN 0108-2701 J9 ACTA CRYSTALLOGR C JI Acta Crystallogr. Sect. C-Cryst. Struct. Commun. PD AUG 15 PY 1992 VL 48 BP 1532 EP 1533 DI 10.1107/S0108270191014968 PN 8 PG 2 WC Chemistry, Multidisciplinary; Crystallography SC Chemistry; Crystallography GA JL206 UT WOS:A1992JL20600067 ER PT J AU DEENEY, C LEPELL, PD ROTH, I NASH, T WARREN, L PRASAD, RR MCDONALD, C CHILDERS, FK SINCERNY, P COULTER, MC WHITNEY, KG AF DEENEY, C LEPELL, PD ROTH, I NASH, T WARREN, L PRASAD, RR MCDONALD, C CHILDERS, FK SINCERNY, P COULTER, MC WHITNEY, KG TI NEON GAS PUFF IMPLOSIONS ON A HIGH-CURRENT MICROSECOND GENERATOR WITH AND WITHOUT A PLASMA OPENING SWITCH SO JOURNAL OF APPLIED PHYSICS LA English DT Article ID X-RAY-EMISSION; WIRE-ARRAY IMPLOSIONS; Z-PINCH PLASMA AB Implosions of 2.5-cm-diam neon gas shells on a 1.2-mu-s quarter-period, 3 MA driver, FALCON, have produced no more than 7.6 kJ of kilovolt neon K-shell radiation. The incorporation of a plasma opening switch produces faster current pulses: up to 1.8 MA in 190 ns. With the higher rate of rise of current, neon gas puffs have produced up to 13.5 kJ of kilovolt K-shell radiation. Numerical calculations indicate that this increase in radiation is due to the achievement of a higher kinetic energy per ion at higher current levels. Spectroscopic measurements confirm that a significant fraction of the plasma is heated into the K-shell ionization states and that the faster current pulses increase this fraction up to 40%. C1 BERKELEY RES ASSOCIATES INC,SPRINGFIELD,VA 22150. USN,RES LAB,WASHINGTON,DC 20375. RP DEENEY, C (reprint author), PHYS INT CO,2700 MERCED ST,SAN LEANDRO,CA 94577, USA. NR 33 TC 13 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 AUG 15 PY 1992 VL 72 IS 4 BP 1297 EP 1305 DI 10.1063/1.351736 PG 9 WC Physics, Applied SC Physics GA JJ226 UT WOS:A1992JJ22600012 ER PT J AU CLIFFORD, MA HORTON, CW AF CLIFFORD, MA HORTON, CW TI BAROCLINIC TRANSPORT OF THE KUROSHIO EXTENSION BETWEEN 141-DEGREES-E AND 165-DEGREES-E SO JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS LA English DT Article ID GEOSAT ALTIMETRY; GULF-STREAM; VARIABILITY; VELOCITY; JET AB Using a water-mass-based climatology of temperature and salinity, geostrophic transports derived from dynamic height differences across the width of the Kuroshio Extension are presented. The dynamic height differences are obtained by calculating dynamic heights in the warmer water mass south of the Kuroshio and the cooler water mass north of the Kuroshio. The mean baroclinic transport is examined between 141-degrees-E and 165-degrees-E relative to several pressure levels. The baroclinic transports are sensitive to the selection of the northern and southern boundaries. The baroclinic transports increase from 141-degrees-E to about 145-degrees-E and decline east of 145-degrees-E. The computed seasonal variation of the longitudinally averaged baroclinic transport shows a minimum during spring and a broad maximum from July to November. RP USN, OCEANOG OFF, BAY ST LOUIS, MS 39522 USA. NR 17 TC 6 Z9 6 U1 0 U2 0 PU AMER GEOPHYSICAL UNION PI WASHINGTON PA 2000 FLORIDA AVE NW, WASHINGTON, DC 20009 USA SN 2169-9275 EI 2169-9291 J9 J GEOPHYS RES-OCEANS JI J. Geophys. Res.-Oceans PD AUG 15 PY 1992 VL 97 IS C8 BP 12527 EP 12533 DI 10.1029/92JC01180 PG 7 WC Oceanography SC Oceanography GA JK503 UT WOS:A1992JK50300003 ER PT J AU TISCH, TD RAMP, SR COLLINS, CA AF TISCH, TD RAMP, SR COLLINS, CA TI OBSERVATIONS OF THE GEOSTROPHIC CURRENT AND WATER MASS CHARACTERISTICS OFF POINT SUR, CALIFORNIA, FROM MAY 1988 THROUGH NOVEMBER 1989 SO JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS LA English DT Article ID COASTAL TRANSITION ZONE; CURRENT SYSTEM; SEASONAL VARIABILITY; PACIFIC OCEAN; FLOW; DYNAMICS; WINDS; EDDY AB The Point Sur transect (POST) has been occupied 6-8 times per year since 1988 to resolve the flow in the California Current system at seasonal and interannual time scales. The POST extends offshore, normal to bottom topography, along 36-degrees-20'N, to 123-degrees-01.7'W where it doglegs southwest along the California Cooperative Fisheries Investigation (CalCOFI) line 67. Hydrographic observations from seven cruises over 2 years have been used to study variations of alongshore geostrophic velocities and water mass characteristics within these time scales. The California Undercurrent was a prominent feature in six of the seven sections analyzed and was very weak during a period of strong equatorward wind stress. The position of the undercurrent core varied from 12 to 42 km from shore while its strength varied from less than 5 cm s-1 to 35 cm s-1, with the maximum flow occurring in winter. The undercurrent (core) over the continental slope was found from 70 to 460 m depth throughout these seven cruises. The nature of the alongshore geostrophic velocities and the location and spatial extent of the California Undercurrent appear strongly related to specific wind events, both local and remote. Remote wind forcing from the south was believed to cause anomalous, strong poleward flow throughout the entire water column above 1000 dbar during a period of local equatorward wind stress. RP TISCH, TD (reprint author), USN,SCH POSTGRAD,MONTEREY,CA 93940, USA. NR 44 TC 29 Z9 29 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 AUG 15 PY 1992 VL 97 IS C8 BP 12535 EP 12555 DI 10.1029/92JC01094 PG 21 WC Oceanography SC Oceanography GA JK503 UT WOS:A1992JK50300004 ER PT J AU CHYLEK, P DAMIANO, P SHETTLE, EP AF CHYLEK, P DAMIANO, P SHETTLE, EP TI INFRARED EMITTANCE OF WATER CLOUDS SO JOURNAL OF THE ATMOSPHERIC SCIENCES LA English DT Article ID CIRRUS CLOUDS; RADIATIVE PROPERTIES; OPTICAL-PROPERTIES; SINGLE-SCATTERING; CLIMATIC FEEDBACK; CROSS-SECTIONS; EXTINCTION; EMISSIVITY; ABSORPTION; PARTICLES AB A simple approximation has been developed for the infrared emittance of clouds composed of water spheres based on the absorption approximation for the emittance and on the polynomial approximation to the Mie absorption efficiency. The expression for the IR emittance is obtained in a simple analytical form as a function of the liquid water content and two size distribution parameters, namely, the effective radius and effective variance. The approximation is suitable for numerical weather prediction, climate modeling, and radiative transfer calculations. The accuracy, when compared to the exact Mie calculation and integration over the size distribution, is within a few percent, while the required computer time is reduced by several orders of magnitude. In the limit of small droplet sizes, the derived IR emittance reduces to a term proportional to the liquid water content. C1 USN,RES LAB,DIV OPT SCI,WASHINGTON,DC 20375. SUNY ALBANY,ATMOSPHER SCI RES CTR,ALBANY,NY 12222. SUNY ALBANY,DEPT ATMOSPHER SCI,ALBANY,NY 12222. RP CHYLEK, P (reprint author), DALHOUSIE UNIV,DEPT PHYS & OCEANOG,ATMOSPHER SCI PROGRAM,HALIFAX B3H 3J5,NS,CANADA. NR 49 TC 36 Z9 38 U1 0 U2 2 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 AUG 15 PY 1992 VL 49 IS 16 BP 1459 EP 1472 DI 10.1175/1520-0469(1992)049<1459:IEOWC>2.0.CO;2 PG 14 WC Meteorology & Atmospheric Sciences SC Meteorology & Atmospheric Sciences GA JG889 UT WOS:A1992JG88900005 ER PT J AU BECKLEHIMER, J PANDEY, RB AF BECKLEHIMER, J PANDEY, RB TI A COMPUTER-SIMULATION STUDY OF STICKS PERCOLATION SO PHYSICA A LA English DT Article AB A computer-simulation model is used to study the percolation phase transition of stiff chains/sticks on a square lattice. By varying the chain length, effects of the chain length (L(c)) on the percolation transition is explored. The percolation exponents seem to remain unchanged with L(c). The percolation threshold p(c) depends strongly on the chain-length, and shows a power-law dependence p(c)(L(c)) approximately L(c)-1/2. C1 USN,RES LAB DETACHMENT,BAY ST LOUIS,MS 39529. UNIV SO MISSISSIPPI,DEPT PHYS & ASTRON,HATTIESBURG,MS 39406. RP BECKLEHIMER, J (reprint author), UNIV SO MISSISSIPPI,PROGRAM SCI COMP,HATTIESBURG,MS 39406, USA. NR 6 TC 12 Z9 12 U1 0 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0378-4371 J9 PHYSICA A JI Physica A PD AUG 15 PY 1992 VL 187 IS 1-2 BP 71 EP 76 DI 10.1016/0378-4371(92)90409-J PG 6 WC Physics, Multidisciplinary SC Physics GA JL441 UT WOS:A1992JL44100004 ER PT J AU HEAGY, JF AF HEAGY, JF TI A PHYSICAL INTERPRETATION OF THE HENON MAP SO PHYSICA D LA English DT Article ID PERIODIC-ORBITS; CHAOTIC ATTRACTORS; STRANGE ATTRACTORS; MORSE OSCILLATOR; DYNAMICS AB The orientation-preserving Henon map is shown to be equivalent to the period one return map of a periodically kicked harmonic oscillator with a suitable nonlinear coupling to the kicking term. The conservative, dissipative, and extremely dissipative (logistic limit) cases are each considered. All can be derived from a single differential equation describing the kicked oscillator system. In each case explicit coordinate and parameter transformations are given relating the return map of the kicked harmonic oscillator to a standard form of the Henon map. In the dissipative case two studies are presented with periodic kicking replaced by a smooth periodic function. Each is found to yield a "Henon-like" chaotic attractor. RP HEAGY, JF (reprint author), USN,CTR SURFACE WARFARE,10901 NEW HAMPSHIRE AVE,SILVER SPRING,MD 20903, USA. NR 29 TC 5 Z9 5 U1 0 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0167-2789 J9 PHYSICA D JI Physica D PD AUG 15 PY 1992 VL 57 IS 3-4 BP 436 EP 446 DI 10.1016/0167-2789(92)90012-C PG 11 WC Mathematics, Applied; Physics, Multidisciplinary; Physics, Mathematical SC Mathematics; Physics GA JP436 UT WOS:A1992JP43600012 ER PT J AU MEYER, JR ARNOLD, DJ HOFFMAN, CA BARTOLI, FJ RAMMOHAN, LR AF MEYER, JR ARNOLD, DJ HOFFMAN, CA BARTOLI, FJ RAMMOHAN, LR TI ELECTRON AND HOLE INPLANE MOBILITIES IN HGTE-CDTE SUPERLATTICES SO PHYSICAL REVIEW B LA English DT Article ID INTERFACE ROUGHNESS SCATTERING; IONIZED-IMPURITY SCATTERING; MOLECULAR-BEAM EPITAXY; SCREENING LIMIT; TRANSPORT; GAP; WELLS AB Using a recently developed formalism for free-carrier transport in semiconductor superlattices with interacting quantum wells, we have calculated in-plane mobilities for electrons and holes in HgTe-CdTe heterostructures. Details of the highly nonparabolic and anisotropic band structures are fully incorporated into the theory, and the previous treatment of interface roughness scattering in quasi-two-dimensional structures has been generalized to account for superlattices with significant interwell interactions. Our results accurately account for a number of distinctive features in the experimental data, and good agreement between theory and experiment is obtained. C1 WORCESTER POLYTECH INST,WORCESTER,MA 01609. RP MEYER, JR (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. RI Ram-Mohan, Ramdas/C-5167-2012 NR 24 TC 28 Z9 28 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 15 PY 1992 VL 46 IS 7 BP 4139 EP 4146 DI 10.1103/PhysRevB.46.4139 PG 8 WC Physics, Condensed Matter SC Physics GA JJ846 UT WOS:A1992JJ84600052 ER PT J AU CHOU, WC PETROU, A WARNOCK, J JONKER, BT AF CHOU, WC PETROU, A WARNOCK, J JONKER, BT TI SPIN-RELAXATION PROCESSES IN ZNSE-BASED SPIN SUPERLATTICES - A PHOTOLUMINESCENCE STUDY SO PHYSICAL REVIEW B LA English DT Note ID SEMICONDUCTOR QUANTUM-WELLS; POLARIZATION AB We have studied the spin-relaxation process in spin superlattice structures, both at zero field (no confining potential) and as a function of applied field (variable confining potential). Evidence of an unexpectedly long hole spin-relaxation time associated with the strain splitting of the valence band has been found. In addition, excitonic spin-relaxation times which are unaffected by the strength of the spin-dependent confining potential were observed. We demonstrate that for excitons, spin flip via the magnetic ion-carrier exchange interaction is not the dominant spin-relaxation mechanism, although it may play a more important role in the case of energetic hot carriers. C1 SUNY BUFFALO,CTR ELECTR & ELECTROOPT MAT,BUFFALO,NY 14260. IBM CORP,THOMAS J WATSON RES CTR,DIV RES,YORKTOWN HTS,NY 10598. USN,RES LAB,WASHINGTON,DC 20375. RP CHOU, WC (reprint author), SUNY BUFFALO,DEPT PHYS & ASTRON,BUFFALO,NY 14260, USA. NR 10 TC 28 Z9 28 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 15 PY 1992 VL 46 IS 7 BP 4316 EP 4319 DI 10.1103/PhysRevB.46.4316 PG 4 WC Physics, Condensed Matter SC Physics GA JJ846 UT WOS:A1992JJ84600084 ER PT J AU ANCONA, MG AF ANCONA, MG TI DENSITY-GRADIENT ANALYSIS OF FIELD-EMISSION FROM METALS SO PHYSICAL REVIEW B LA English DT Article ID SELF-CONSISTENT CALCULATION; JELLIUM; SURFACE; ENERGY; EQUATION; STATE AB The conventional theory of field emission from metals consists of the Fowler-Nordheim tunneling analysis with space-charge effects accounted for using the "image-force" concept. This one-electron approach is highly questionable because the potential barrier through which the tunneling occurs is located very close (< 3 angstrom) to the cathode interface, a region in which the charge density is quite high due to "spillover" effects. In this paper, we give an improved analysis of the field-emission current based on an approximate many-body quantum transport theory known as density-gradient theory. These calculations represent a much more realistic treatment of the emitting electrode in which the important interactions of the problem-the Coulomb interaction, exchange-correlation effects, and the finite screening capacity (field penetration) of the electrode-are treated in an approximate but fully coupled manner. From these calculations we find that the location, height, and bias dependence of the barrier differ sharply from those of conventional theory. Qualitatively, the calculated current remains Fowler-Nordheim-like and so remains in agreement with experiment. However, the size of the space-charge effect on the current is found to be very much smaller than predicted by image-force theory to the point that it is a much better approximation simply to ignore the space charge. This is in accord with most experimental observation and contrasts with the conventional theory whose prediction of unrealistically small effective emitting areas is well known. RP USN, RES LAB, WASHINGTON, DC 20375 USA. NR 51 TC 18 Z9 18 U1 0 U2 1 PU AMER PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1098-0121 EI 1550-235X J9 PHYS REV B JI Phys. Rev. B PD AUG 15 PY 1992 VL 46 IS 8 BP 4874 EP 4883 DI 10.1103/PhysRevB.46.4874 PG 10 WC Physics, Condensed Matter SC Physics GA JK725 UT WOS:A1992JK72500056 ER PT J AU HELLIWELL, TM KONKOWSKI, DA AF HELLIWELL, TM KONKOWSKI, DA TI STABILITY ANALYSIS OF A NONSCALAR CURVATURE SINGULARITY SO PHYSICAL REVIEW D LA English DT Article ID QUASIREGULAR SINGULARITIES; COSMOLOGIES; SPACETIME AB The behavior of test scalar waves on a dust-filled type-V locally rotationally symmetric spacetime is used to probe the nonscalar curvature singularity present and its associated Cauchy horizon. It is argued that the divergence of the stress-energy scalars for most wave modes makes the nonscalar curvature singularity unstable in general. However, a special subset of modes does not lead to divergence of the stress-energy scalars at the nonscalar singularity. These modes would leave the nonscalar curvature singularity unchanged. Furthermore, examination of the stress-energy tensor in a parallel-propagated orthonormal frame and stress-energy scalars show that the Cauchy horizon is left unchanged. C1 USN ACAD,DEPT MATH,ANNAPOLIS,MD 21402. RP HELLIWELL, TM (reprint author), HARVEY MUDD COLL,DEPT PHYS,CLAREMONT,CA 91711, USA. NR 12 TC 7 Z9 7 U1 2 U2 3 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0556-2821 J9 PHYS REV D JI Phys. Rev. D PD AUG 15 PY 1992 VL 46 IS 4 BP 1424 EP 1428 DI 10.1103/PhysRevD.46.1424 PG 5 WC Astronomy & Astrophysics; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA JH749 UT WOS:A1992JH74900019 ER PT J AU STAMLER, JS JARAKI, O OSBORNE, J SIMON, DI KEANEY, J VITA, J SINGEL, D VALERI, CR LOSCALZO, J AF STAMLER, JS JARAKI, O OSBORNE, J SIMON, DI KEANEY, J VITA, J SINGEL, D VALERI, CR LOSCALZO, J TI NITRIC-OXIDE CIRCULATES IN MAMMALIAN PLASMA PRIMARILY AS AN S-NITROSO ADDUCT OF SERUM-ALBUMIN SO PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA LA English DT Article DE S-NITROSOTHIOLS; ENDOTHELIUM-DERIVED RELAXING FACTOR ID RELAXING FACTOR; ENDOTHELIUM; RELAXATION; HEMOGLOBIN; ARTERY; TONE AB We have recently shown that nitric oxide or authentic endothelium-derived relaxing factor generated in a biologic system reacts in the presence of specific protein thiols to form S-nitrosoprotein derivatives that have endothelium-derived relaxing factor-like properties. The single free cysteine of serum albumin, Cys-34, is particularly reactive toward nitrogen oxides (most likely nitrosonium ion) under physiologic conditions, primarily because of its anomalously low pK; given its abundance in plasma, where it accounts for almost-equal-to 0.5 mM thiol, we hypothesized that this plasma protein serves as a reservoir for nitric oxide produced by the endothelial cell. To test this hypothesis, we developed a methodology, which involves UV photolytic cleavage of the S-NO bond before reaction with ozone for chemiluminescence detection, with which to measure free nitric oxide, S-nitrosothiols, and S-nitrosoproteins in biologic systems. We found that human plasma contains almost-equal-to 7-mu-M S-nitrosothiols, of which 96% are S-nitrosoproteins, 82% of which is accounted for by S-nitroso-serum albumin. By contrast, plasma levels of free nitric oxide are only in the 3-nM range. In rabbits, plasma S-nitrosothiols are present at almost-equal-to 1-mu-M; 60 min after administration of N(G)-monomethyl-L-arginine at 50 mg/ml, a selective and potent inhibitor of nitric oxide synthetases, S-nitrosothiols decreased by almost-equal-to 40% (>95% of which were accounted for by S-nitrosoproteins, and almost-equal-to 80% of which was S-nitroso-serum albumin); this decrease was accompanied by a concomitant increase in mean arterial blood pressure of 22%. These data suggest that naturally produced nitric oxide circulates in plasma primarily complexed in S-nitrosothiol species, principal among which is S-nitroso-serum albumin. This abundant, relatively long-lived adduct likely serves as a reservoir with which plasma levels of highly reactive, short-lived free nitric oxide can be regulated for the maintenance of vascular tone. C1 BOSTON UNIV,SCH MED,USN,BLOOD RES LAB,75 FRANCIS ST,BOSTON,MA 02118. HARVARD UNIV,DEPT CHEM,CAMBRIDGE,MA 02138. HARVARD UNIV,DEPT CHEM,CAMBRIDGE,MA 02138. FU NHLBI NIH HHS [HL40411, HL43344, K08HL02582] NR 20 TC 1007 Z9 1023 U1 4 U2 24 PU NATL ACAD PRESS PI WASHINGTON PA 2101 CONSTITUTION AVE NW, WASHINGTON, DC 20418 SN 0027-8424 J9 P NATL ACAD SCI USA JI Proc. Natl. Acad. Sci. U. S. A. PD AUG 15 PY 1992 VL 89 IS 16 BP 7674 EP 7677 DI 10.1073/pnas.89.16.7674 PG 4 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA JJ321 UT WOS:A1992JJ32100080 PM 1502182 ER PT J AU ERICKSON, JW THEIS, WM COLE, T GREEN, AK REHN, V AF ERICKSON, JW THEIS, WM COLE, T GREEN, AK REHN, V TI A PHOTOEMISSION-STUDY OF COHERENTLY STRAINED INXGA1-XAS/INP(100) SO SURFACE SCIENCE LA English DT Article ID ZINCBLENDE STRUCTURE; SURFACE SEGREGATION; LATTICE-DYNAMICS; ANB8-N COMPOUNDS; 100 SURFACES; MBE GROWTH; GAAS; ALLOYS; DISCONTINUITY; APPROXIMATION AB Coherently strained 8 nm thick films of InO.30Ga0.70As (tensional strain = 1.7%) and In0.75Ga0.25Aa (compressional strain = -1.5%) were grown by molecular beam epitaxy on InP(100), on which In0.53Ga0.47As is the lattice-matched composition. Samples were studied with synchrotron-radiation photoemission measurements of the d-core levels of each ion. The results show (i) shifts of the core-level energies of surface ions consistent with previous results on As-rich (100) III-V surfaces, and (ii) significant intrinsic broadening of the core levels, especially the In 4d. Comparison of the two compositions showed (i) an increase in the binding energies of the Ga 3d and In 4d peak by 0.17 eV at the higher In concentration, and (ii) a constant separation of the In 4d from the Ga 3d of (1.80 +/- 0.03) eV. A rigid-ion model of the alloy-semiconductor surface successfully predicts the observed halfwidths. The model also predicts that surface rumpling occurs in the As-terminated cation layer: The In ions are pushed out beyond the Ga ions. This rumpling has the effect of increasing the shift of the 4d-core binding energy for the "surface" In atoms. C1 USN,CTR AIR WARFARE,DIV WEAPONS,RES DEPT,DIV PHYS,CHINA LAKE,CA 93555. RP ERICKSON, JW (reprint author), CHARLES EVANS & ASSOCIATES,REDWOOD CITY,CA 94063, USA. NR 32 TC 1 Z9 1 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0039-6028 J9 SURF SCI JI Surf. Sci. PD AUG 15 PY 1992 VL 274 IS 3 BP 363 EP 377 DI 10.1016/0039-6028(92)90841-S PG 15 WC Chemistry, Physical; Physics, Condensed Matter SC Chemistry; Physics GA JH828 UT WOS:A1992JH82800015 ER PT J AU CAMPBELL, DK GAMMEL, JT LIN, HQ LOH, EY AF CAMPBELL, DK GAMMEL, JT LIN, HQ LOH, EY TI TRIPLET-STATES AND OPTICAL ABSORPTIONS IN FINITE POLYENES AND CONJUGATED POLYMERS SO SYNTHETIC METALS LA English DT Article; Proceedings Paper CT CONF ON OPTICAL PROBES OF CONJUGATED POLYMERS CY AUG 22-25, 1991 CL SNOWBIRD, UT ID TRANS-POLYACETYLENE; EXCITATIONS AB We study the nature of triplet states in correlated quasi-one-dimensional bands, with emphasis on the half-filled case relevant to conducting polymers. To incorporate both electron-phonon and electron-electron interaction effects, we use a Peierls-extended Hubbard Hamiltonian, which we solve for finite systems via (numerically) exact diagonon (Lanczos) techniques. We extend our results to polymers using both standard finite-size extrapolation techniques and a novel boundary-condition averaging scheme. First, we examine the nature of the lowest triplet state, focusing on the crossover from the free-electron picture of neutral soliton pairs to the strongly correlated limit of spin excitation. We then examine the optical absorption spectra corresponding to (allowed) triplet-triplet transitions; for this purpose it is important that our novel boundary-condition averaging method maintains sharp gap-edge features while reducing spurious rapid frequency variations produced by the finite-size approximations to the band-to-band continuum. We compare our results to data on triplet transitions in finite polyenes and discuss possible additional experimental implications, including the interpretation of recent spin-dependent photomodulation (SDPM) experiments in both trans-(CH)x and non-degenerate ground-state conjugated polymers. C1 USN,CTR OCEAN SYST,SAN DIEGO,CA 92152. THINKING MACHINES CORP,CAMBRIDGE,MA 02142. RP CAMPBELL, DK (reprint author), LOS ALAMOS NATL LAB,CTR NONLINEAR STUDIES,MS-B258,LOS ALAMOS,NM 87545, USA. NR 26 TC 5 Z9 5 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 AUG 15 PY 1992 VL 50 IS 1-3 BP 631 EP 646 DI 10.1016/0379-6779(92)90220-D PG 16 WC Materials Science, Multidisciplinary; Physics, Condensed Matter; Polymer Science SC Materials Science; Physics; Polymer Science GA JT306 UT WOS:A1992JT30600031 ER PT J AU GOLDBERG, L MEHUYS, D AF GOLDBERG, L MEHUYS, D TI 21-W BROAD AREA NEAR-DIFFRACTION-LIMITED SEMICONDUCTOR AMPLIFIER SO APPLIED PHYSICS LETTERS LA English DT Article ID LASER AB A 600-mu-m wide broad area single pass GaAlAs traveling wave amplifier emitted 21 W in pulsed operation. The far-field was dominated by a near-diffraction limited 0.08-degrees wide lobe, with 16 W measured in a 0.9-degrees angular aperture. Current dependent scattering of the output beam power to outside of the diffraction-limited lobe was observed. C1 SPECTRA DIODE LABS,SAN JOSE,CA 95134. RP GOLDBERG, L (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 7 TC 29 Z9 29 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 AUG 10 PY 1992 VL 61 IS 6 BP 633 EP 635 DI 10.1063/1.107830 PG 3 WC Physics, Applied SC Physics GA JG946 UT WOS:A1992JG94600005 ER PT J AU WARK, JS WOOLSEY, NC WHITLOCK, RR AF WARK, JS WOOLSEY, NC WHITLOCK, RR TI NOVEL MEASUREMENTS OF HIGH-DYNAMIC CRYSTAL STRENGTH BY PICOSECOND X-RAY-DIFFRACTION SO APPLIED PHYSICS LETTERS LA English DT Article ID FRACTURE; SILICON AB The fracture strength of many brittle materials is known to increase with the cubed root of the strain rate. At ultrahigh strain rates, the strengths should approach the ideal fracture strength. We have made direct measurements of the dynamic tension in laser-shocked silicon wafers at strain rates in excess of 10(8) s-1 by the use of picosecond x-ray diffraction. The elastic strains observed (3.4% +/- 0.2%) correspond to tensile stresses of the order of 70 kbar, and are comparable to the highest fracture strengths observed in static measurements. C1 USN,RES LAB,WASHINGTON,DC 20375. RP WARK, JS (reprint author), UNIV OXFORD,DEPT PHYS,CLARENDON LAB,PARKS RD,OXFORD OX1 3PU,ENGLAND. NR 10 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 0003-6951 J9 APPL PHYS LETT JI Appl. Phys. Lett. PD AUG 10 PY 1992 VL 61 IS 6 BP 651 EP 653 DI 10.1063/1.107811 PG 3 WC Physics, Applied SC Physics GA JG946 UT WOS:A1992JG94600011 ER PT J AU REISINGER, AR HARRIS, KA MYERS, TH YANKA, RW MOHNKERN, LM HOFFMAN, CA AF REISINGER, AR HARRIS, KA MYERS, TH YANKA, RW MOHNKERN, LM HOFFMAN, CA TI CARRIER LIFETIME IN HGTE/CDTE SUPERLATTICES GROWN BY PHOTOASSISTED MOLECULAR-BEAM EPITAXY SO APPLIED PHYSICS LETTERS LA English DT Article ID HGTE-CDTE SUPERLATTICES; SUPER-LATTICE; PHOTOLUMINESCENCE; HGCDTE AB We report excess carrier lifetimes of several hundred nanoseconds in HgTe/CdTe superlattices grown by photoassisted molecular beam epitaxy. The structures were doped either n-type in the low 10(15) cm-3 range or p-type in the low 10(16) cm-3 range, and were designed for peak response in the long-wave infrared regime. The measured lifetimes, recorded by the transient photoconductivity technique, approach values calculated for alloys of equivalent band-gap energy. They indicate that recombination at the superlattice interfaces has been substantially reduced and underscore the recent progress achieved in superlattice growth technology. C1 USN,RES LAB,WASHINGTON,DC 20375. RP REISINGER, AR (reprint author), GE,ELECTR LAB,SYRACUSE,NY 13221, USA. RI Myers, Thomas/C-3769-2013 NR 15 TC 12 Z9 12 U1 0 U2 1 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0003-6951 J9 APPL PHYS LETT JI Appl. Phys. Lett. PD AUG 10 PY 1992 VL 61 IS 6 BP 699 EP 701 DI 10.1063/1.107826 PG 3 WC Physics, Applied SC Physics GA JG946 UT WOS:A1992JG94600027 ER PT J AU DANIELL, FD SKELLY, RR AF DANIELL, FD SKELLY, RR TI PARTNER NOTIFICATION IN CASES OF HIV-INFECTION SO NEW ENGLAND JOURNAL OF MEDICINE LA English DT Letter RP DANIELL, FD (reprint author), USN,MED HIV PROGRAM,BETHESDA,MD 20889, USA. NR 3 TC 2 Z9 2 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 AUG 6 PY 1992 VL 327 IS 6 BP 435 EP 436 PG 2 WC Medicine, General & Internal SC General & Internal Medicine GA JG356 UT WOS:A1992JG35600029 PM 1625728 ER PT J AU YANG, MJ WAGNER, RJ SHANABROOK, BV MOORE, WJ WATERMAN, JR TWIGG, ME FATEMI, M AF YANG, MJ WAGNER, RJ SHANABROOK, BV MOORE, WJ WATERMAN, JR TWIGG, ME FATEMI, M TI ACCURATE DETERMINATION OF EFFECTIVE QUANTUM-WELL THICKNESS - INFRARED-ABSORPTION BY TRANSVERSE-OPTICAL PHONONS SO APPLIED PHYSICS LETTERS LA English DT Article ID RAMAN-SCATTERING AB We have studied far infrared transmission spectra of various AlSb/InAs/AlSb single quantum wells, where the well width ranges from 60 to 200 angstrom. Because the quantum well is thin, the far infrared absorption due to transverse-optical phonons is not saturated. We obtained excellent fitting to the transmission spectra by taking into account the complex dielectric functions with a transfer matrix formalism. The thickness of InAs quantum wells can be determined with monolayer resolution. High-resolution transmission electron microscopy shows clear lattice images in a region away from the AlSb/InAs interfaces. The thickness of the pure nonintermixed InAs region is in excellent agreement with our far infrared absorption results. Phonon absorption can therefore provide a nondestructive method to effectively determine the number of pure InAs monolayers, in spite of interdiffusion occurring at the interface. RP YANG, MJ (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 21 TC 11 Z9 11 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 AUG 3 PY 1992 VL 61 IS 5 BP 583 EP 585 DI 10.1063/1.107844 PG 3 WC Physics, Applied SC Physics GA JG157 UT WOS:A1992JG15700029 ER PT J AU LEAN, J SKUMANICH, A WHITE, O AF LEAN, J SKUMANICH, A WHITE, O TI ESTIMATING THE SUNS RADIATIVE OUTPUT DURING THE MAUNDER MINIMUM SO GEOPHYSICAL RESEARCH LETTERS LA English DT Article ID IRRADIANCE VARIATIONS; SOLAR IRRADIANCE; CLIMATIC-CHANGE; LUMINOSITY; STARS; CYCLE; LINE AB The coincidence between the Maunder Minimum of solar magnetic activity from 1645 to 1715 and the coldest temperatures of the Little Ice Age raises the question of possible solar forcing of the Earth's climate. Using a correlation which we find between measured total solar irradiance (corrected for sunspot effects) and a Ca II surrogate for bright magnetic features, we estimate the Sun's radiative output in the absence of such features to be 1365.43 W/m2, or 0.15% below its mean value of 1367.54 W/m2 measured during the period 1980 to 1986 by the ACRIM experiment. Observations of extant solar-type stars suggest that the Ca II surrogate was darker during the Maunder Minimum. Allowing for this, we estimate the total solar irradiance to be 1364.28 W/m2 or 0.24% below its mean value for the 1980 to 1986 period. The decrease in the global equilibrium temperature of the Earth due to a decrease of 0.24% in total solar irradiance lies in the range from 0.2-degrees-C to 0.6-degrees-C. which can be compared with the approximately 1-degrees-C cooling experienced during the Little Ice Age, relative to the present. C1 NATL CTR ATMOSPHER RES,HIGH ALTITUDE OBSERV,BOULDER,CO 80307. RP LEAN, J (reprint author), USN,RES LAB,EO HULBURT CTR SPACE RES,WASHINGTON,DC 20375, USA. OI Lean, Judith/0000-0002-0087-9639 NR 21 TC 99 Z9 102 U1 0 U2 4 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 3 PY 1992 VL 19 IS 15 BP 1591 EP 1594 DI 10.1029/92GL01578 PG 4 WC Geosciences, Multidisciplinary SC Geology GA JH144 UT WOS:A1992JH14400016 ER PT J AU KARLE, IL AF KARLE, IL TI FOLDING, AGGREGATION AND MOLECULAR RECOGNITION IN PEPTIDES SO ACTA CRYSTALLOGRAPHICA SECTION B-STRUCTURAL SCIENCE LA English DT Article ID ALPHA-AMINOISOBUTYRIC-ACID; SYNTHETIC PROTEIN MIMICS; LEU-AIB-OME; ION-CHANNEL PEPTIDE; X-RAY-DIFFRACTION; CRYSTAL-STRUCTURE; HELICAL PEPTIDE; MODULAR DESIGN; LEUCINE ZIPPER; PARALLEL PACKING AB In past years, most of the X-ray structure determinations of oligopeptides were for cyclic peptides or for short linear peptides. Longer peptides usually presented many difficulties in obtaining suitable crystals since the molecules are intrinsically very flexible. More recently, it has been appreciated that the aminoisobutyric acid residue (Aib), which occurs naturally in many peptides of microbial origin, initiates helix folding. Several score of 7- to 15-residue linear peptides containing Aib have been synthesized, crystallized and had their structures determined to high resolution. Many of the peptide structures have been determined in more than one crystalline form. These peptide structures have yielded a plethora of information on types of helices, modes of hydration, water penetration into helical backbones, helices bent by Pro residues. parallel and antiparallel association of helices, effects of Leu residues on association of peptides, an example of a zipper assembly by side chains, and an example of a possible ion channel with a gating mechanism. RP KARLE, IL (reprint author), USN,RES LAB,STRUCT MATTER LAB,WASHINGTON,DC 20375, USA. FU NIGMS NIH HHS [GM30902] NR 85 TC 68 Z9 68 U1 0 U2 6 PU MUNKSGAARD INT PUBL LTD PI COPENHAGEN PA 35 NORRE SOGADE, PO BOX 2148, DK-1016 COPENHAGEN, DENMARK SN 0108-7681 J9 ACTA CRYSTALLOGR B JI Acta Crystallogr. Sect. B-Struct. Commun. PD AUG 1 PY 1992 VL 48 BP 341 EP 356 DI 10.1107/S0108768192000673 PN 4 PG 16 WC Chemistry, Multidisciplinary; Crystallography SC Chemistry; Crystallography GA JH618 UT WOS:A1992JH61800001 PM 1418817 ER PT J AU ZERILLI, FJ ARMSTRONG, RW AF ZERILLI, FJ ARMSTRONG, RW TI THE EFFECT OF DISLOCATION DRAG ON THE STRESS-STRAIN BEHAVIOR OF FCC METALS SO ACTA METALLURGICA ET MATERIALIA LA English DT Article AB The introduction of viscous drag into a simple thermally activated dislocation model for the low temperature plastic deformation of fc.c. metals leads to some surprising predictions about their stress strain behavior. One effect of dislocation drag is to produce a region of tensile instability at small strains for any strain rate. At sufficiently high strain rates there is no region of tensile stability. However, computation of a decreased strain for tensile instability at strain rates greater than 10(3) s-1, in opposition to experimental measurements, provides evidence that the strong upturn reported for the flow stress of copper is not caused by dislocation drag. The likely explanation is an enhanced rate of dislocation generation. C1 UNIV MARYLAND, DEPT MECH ENGN, COLLEGE PK, MD 20742 USA. RP ZERILLI, FJ (reprint author), USN, CTR SURFACE WARFARE, DEPT RES & TECHNOL, SILVER SPRING, MD 20903 USA. NR 14 TC 120 Z9 124 U1 5 U2 20 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 AUG PY 1992 VL 40 IS 8 BP 1803 EP 1808 DI 10.1016/0956-7151(92)90166-C PG 6 WC Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Materials Science; Metallurgy & Metallurgical Engineering GA JD129 UT WOS:A1992JD12900002 ER PT J AU BALL, RE CARAVASOS, N AF BALL, RE CARAVASOS, N TI COMBAT SURVIVABILITY - A LOOK AT THE FUNDAMENTALS SO AEROSPACE AMERICA LA English DT Article RP BALL, RE (reprint author), USN,POSTGRAD SCH,WASHINGTON,DC 20350, USA. NR 0 TC 0 Z9 0 U1 0 U2 1 PU AMER INST AERONAUT ASTRONAUT PI RESTON PA 1801 ALEXANDER BELL DRIVE, STE 500, RESTON, VA 22091 SN 0740-722X J9 AEROSPACE AM JI Aerosp. Am. PD AUG PY 1992 VL 30 IS 8 BP 30 EP 33 PG 4 WC Engineering, Aerospace SC Engineering GA JG683 UT WOS:A1992JG68300004 ER PT J AU FOULKE, KW AF FOULKE, KW TI AIRCRAFT SUSCEPTIBILITY - CONTROLLING RADAR SIGNATURE SO AEROSPACE AMERICA LA English DT Article RP FOULKE, KW (reprint author), USN,CTR AIR WARFARE,WASHINGTON,DC 20350, USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER INST AERONAUT ASTRONAUT PI RESTON PA 1801 ALEXANDER BELL DRIVE, STE 500, RESTON, VA 22091 SN 0740-722X J9 AEROSPACE AM JI Aerosp. Am. PD AUG PY 1992 VL 30 IS 8 BP 44 EP 46 PG 3 WC Engineering, Aerospace SC Engineering GA JG683 UT WOS:A1992JG68300011 ER PT J AU THRONDSON, L BURGNER, G AF THRONDSON, L BURGNER, G TI SPECIAL PROPULSION CONTROLS FOR SURVIVABILITY SO AEROSPACE AMERICA LA English DT Article RP THRONDSON, L (reprint author), USN,CTR AIR WARFARE,DIV WEAPONS,WASHINGTON,DC 20350, USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER INST AERONAUT ASTRONAUT PI RESTON PA 1801 ALEXANDER BELL DRIVE, STE 500, RESTON, VA 22091 SN 0740-722X J9 AEROSPACE AM JI Aerosp. Am. PD AUG PY 1992 VL 30 IS 8 BP 60 EP 62 PG 3 WC Engineering, Aerospace SC Engineering GA JG683 UT WOS:A1992JG68300019 ER PT J AU BOTT, R OVERSTREET, D AF BOTT, R OVERSTREET, D TI COMPOSITE ACTUATORS - LIGHTWEIGHT AND JAM-RESISTANT SO AEROSPACE AMERICA LA English DT Article RP BOTT, R (reprint author), USN,CTR AIR WARFARE DIV WEAPONS,WASHINGTON,DC 20350, USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER INST AERONAUT ASTRONAUT PI RESTON PA 1801 ALEXANDER BELL DRIVE, STE 500, RESTON, VA 22091 SN 0740-722X J9 AEROSPACE AM JI Aerosp. Am. PD AUG PY 1992 VL 30 IS 8 BP 61 EP 61 PG 1 WC Engineering, Aerospace SC Engineering GA JG683 UT WOS:A1992JG68300020 ER PT J AU JEPSEN, DL AF JEPSEN, DL TI HOW TO MANAGE A PATIENT WITH LIGHTNING INJURY SO AMERICAN JOURNAL OF NURSING LA English DT Article RP JEPSEN, DL (reprint author), USN HOSP,NURSE CORPS,TWENTY NINE PALMS,CA, USA. NR 6 TC 1 Z9 1 U1 0 U2 1 PU LIPPINCOTT-RAVEN PUBL PI PHILADELPHIA PA 227 EAST WASHINGTON SQ, PHILADELPHIA, PA 19106 SN 0002-936X J9 AM J NURS JI Am. J. Nurs. PD AUG PY 1992 VL 92 IS 8 BP 38 EP 42 PG 5 WC Nursing SC Nursing GA JL293 UT WOS:A1992JL29300017 PM 1524107 ER PT J AU KASSIM, OO DEAN, DA MANGOLD, BL VONLICHTENBERG, F AF KASSIM, OO DEAN, DA MANGOLD, BL VONLICHTENBERG, F TI COMBINED MICROAUTORADIOGRAPHIC AND HISTOPATHOLOGIC ANALYSIS OF THE FATE OF CHALLENGE SCHISTOSOMA-MANSONI SCHISTOSOMULA IN MICE IMMUNIZED WITH IRRADIATED CERCARIAE SO AMERICAN JOURNAL OF TROPICAL MEDICINE AND HYGIENE LA English DT Article ID AUTORADIOGRAPHIC ANALYSIS; WORM ELIMINATION; CBA/CA MICE; SKIN PHASE; MIGRATION; ATTRITION; RESISTANCE; INFECTION; LUNGS; RATS AB Combined microautoradiographic and histopathologic methods were used to locate and examine schistosomula of Schistosoma mansoni in the lungs of irradiated cercaria-immunized mice 21 days after percutaneous challenge infection with Se-75-labeled cercariae. Of 75 schistosomula examined in serial sections, 53% were located in the pulmonary microvasculature, 23% in alveolar spaces, 3% with one end in a vessel and the other in an alveolar space, and the locations of 21% were not identified. Inflammatory reactions of variable intensity were observed around schistosomula in both vascular and alveolar sites, although the most intense category of reactions was associated almost entirely with alveolar larvae. All autoradiographic foci contained recognizable schistosomula. Although the concentration of reduced silver grains precluded cytostructural analysis, observations on schistosomular contour and shape provided no evidence of larval damage. Our findings suggest that immune elimination of schistosomula in mice immunized with irradiated cercariae is partly or largely effected by a process of alveolar extrusion of viable parasites during their lung migration. C1 USN,MED RES UNIT 3,CAIRO,EGYPT. HARVARD UNIV,SCH MED,DEPT PATHOL,BOSTON,MA 02115. BRIGHAM & WOMENS HOSP,BOSTON,MA 02115. RP KASSIM, OO (reprint author), HOWARD UNIV,DEPT MICROBIOL,WASHINGTON,DC 20059, USA. NR 30 TC 23 Z9 23 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 AUG PY 1992 VL 47 IS 2 BP 231 EP 237 PG 7 WC Public, Environmental & Occupational Health; Tropical Medicine SC Public, Environmental & Occupational Health; Tropical Medicine GA JL246 UT WOS:A1992JL24600013 PM 1503190 ER PT J AU DEAN, DA MANGOLD, BL AF DEAN, DA MANGOLD, BL TI EVIDENCE THAT BOTH NORMAL AND IMMUNE ELIMINATION OF SCHISTOSOMA-MANSONI TAKE PLACE AT THE LUNG STAGE OF MIGRATION PRIOR TO PARASITE DEATH SO AMERICAN JOURNAL OF TROPICAL MEDICINE AND HYGIENE LA English DT Article ID HIGHLY IRRADIATED CERCARIAE; AUTORADIOGRAPHIC ANALYSIS; WORM ELIMINATION; PASSIVE TRANSFER; CHALLENGE SCHISTOSOMULA; LABELED SCHISTOSOMULA; TEMPORAL DISTRIBUTION; ATTENUATED CERCARIAE; CBA/CA MICE; SKIN PHASE AB The number and distribution of autoradiographic foci observation in this and previous studies following percutaneous infection with Se-75-labeled Schistosoma mansoni cercariae indicate that the lungs are the principal site of worm elimination in both normal mice and mice immunized with irradiated cercariae. It was observed in the present study, however, that the intensities of the autoradiographic foci produced in the lungs during both the normal (early) and immune (late) phases of elimination were identical to those of foci produced in the livers of the same mice by larvae shown to be alive. In contrast, foci produced in the lungs by heat-killed, intravenously injected, lung schistosomula became smaller and fainter with time, disappearing completely between seven and 10 days after injection in normal mice and between four and six days in immunized mice. These results indicate that although the targets of both normal and immune elimination do not proceed beyond the lung stage of migration, they do not die in the lungs. A possible explanation for this paradoxical situation, for which there is some experimental evidence, is that unsuccessful migrators leave the blood stream, enter alveoli, pass up the trachea, and are eventually digested in the gastrointestinal tract or eliminated from the body intact. RP DEAN, DA (reprint author), USN,MED RES UNIT 3,CAIRO,EGYPT. NR 41 TC 46 Z9 47 U1 0 U2 2 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 AUG PY 1992 VL 47 IS 2 BP 238 EP 248 PG 11 WC Public, Environmental & Occupational Health; Tropical Medicine SC Public, Environmental & Occupational Health; Tropical Medicine GA JL246 UT WOS:A1992JL24600014 PM 1503191 ER PT J AU CLENDENNEN, TE ECHEVERRIA, P SAENGEUR, S KEES, ES BOSLEGO, JW WIGNALL, FS AF CLENDENNEN, TE ECHEVERRIA, P SAENGEUR, S KEES, ES BOSLEGO, JW WIGNALL, FS TI ANTIBIOTIC SUSCEPTIBILITY SURVEY OF NEISSERIA-GONORRHOEAE IN THAILAND SO ANTIMICROBIAL AGENTS AND CHEMOTHERAPY LA English DT Article ID QUALITY-CONTROL GUIDELINES; INTERPRETIVE CRITERIA; ANTIMICROBIAL AGENTS; RESISTANCE; STANDARDIZATION; SPECTINOMYCIN; KOREA AB The antibiotic susceptibilities of Neisseria gonorrhoeae isolates obtained from patients attending sexually transmitted disease clinics in Cholburi and Bangkok, Thailand, were determined by agar dilution. Some 28.2% of isolates produced beta-lactamase. A total of 97.9% of beta-lactamase-positive and 51% of beta-lactamase-negative isolates tested were resistant to penicillin (MICs, greater-than-or-equal-to 2-mu-g/ml), 70% of isolates tested were resistant to tetracycline (MICs, greater-than-or-equal-to 2-mu-g/ml), and 91% of isolates tested were susceptible to spectinomycin (MICs, less-than-or-equal-to 64-mu-g/ml). The MICs for 90% of isolates for the other drugs tested were 2-mu-g/ml for erythromycin, 2-mu-g/ml for cefoxitin, 1-mu-g/ml for cefuroxime, 0.125-mu-g/ml for cefpodoxime, 0.06-mu-g/ml for cefotaxime, 0.25-mu-g/ml for ceftazidime, 0.03-mu-g/ml for ceftizoxime, 0.03-mu-g/ml for ceftriaxone, 0.03-mu-g/ml for cefixime, 0.06-mu-g/ml for aztreonam, 0.008-mu-g/ml for ciprofloxacin, 0.125-mu-g/ml for norfloxacin, and 0.075-mu-g/ml for ofloxacin. Fewer than 1.5% of isolates were resistant to the extended-spectrum cephalosporins tested. Some 0.3% or fewer isolates were resistant to broad-spectrum cephalosporins, fluoroquinolones, or the monobactam aztreonam. Antibiotic resistance among N. gonorrhoeae isolates from Cholburi and Bangkok in May 1990 appeared to be primarily limited to penicillin and tetracycline, which are no longer used to control gonorrhea. Spectinomycin, which has been in general use against gonorrhea in Thailand since 1983, has dwindling utility, with resistance at a level of 8.9%. C1 SEXUALLY TRANSMITTED DIS CLIN,CHOLBURI,THAILAND. ARMED FORCES RES INST MED SCI,BANGKOK,THAILAND. RP CLENDENNEN, TE (reprint author), USN,ENVIRONM & PREVENT MED UNIT 6,HONOLULU,HI 96860, USA. NR 16 TC 50 Z9 50 U1 0 U2 0 PU AMER SOC MICROBIOLOGY PI WASHINGTON PA 1325 MASSACHUSETTS AVENUE, NW, WASHINGTON, DC 20005-4171 SN 0066-4804 J9 ANTIMICROB AGENTS CH JI Antimicrob. Agents Chemother. PD AUG PY 1992 VL 36 IS 8 BP 1682 EP 1687 PG 6 WC Microbiology; Pharmacology & Pharmacy SC Microbiology; Pharmacology & Pharmacy GA JG147 UT WOS:A1992JG14700018 PM 1416851 ER PT J AU KUHN, JJ WENIG, BM CLARK, DA AF KUHN, JJ WENIG, BM CLARK, DA TI MYCOSIS-FUNGOIDES OF THE LARYNX - REPORT OF 2 CASES AND REVIEW OF THE LITERATURE SO ARCHIVES OF OTOLARYNGOLOGY-HEAD & NECK SURGERY LA English DT Review ID T-CELL LYMPHOMA; INVOLVEMENT; THERAPY; MANAGEMENT; DIAGNOSIS; STAGE AB Involvement of the larynx by mycosis fungoides is extremely rare with only three reported clinical cases in the English-language literature. We present two patients with laryngeal mycosis fungoides, one of whom presented with vocal cord paresis (progressing to paralysis) as the initial clinical manifestation of laryngeal involvement. Our clinical findings and the observations from the three previous case reports suggest that laryngeal mycosis fungoides has a predilection for the arytenoids, aryepiglottic folds, and the laryngeal surface of the epiglottis. Laryngeal involvement, like other forms of visceral dissemination, appears to manifest clinically in the terminal stages of the disease. The natural history, clinical features, histopathology, and treatment of mycosis fungoides are reviewed and the etiopathology of the vocal cord paralysis is described. C1 ARMED FORCES INST PATHOL,DEPT OTOLARYNG PATHOL,WASHINGTON,DC 20306. RP KUHN, JJ (reprint author), USN,NATL MED CTR,DEPT OTOLARYNGOL HEAD & NECK SURG,CODE 0306,BETHESDA,MD 20889, USA. NR 33 TC 7 Z9 7 U1 1 U2 1 PU AMER MEDICAL ASSOC PI CHICAGO PA 515 N STATE ST, CHICAGO, IL 60610 SN 0886-4470 J9 ARCH OTOLARYNGOL JI Arch. Otolaryngol. Head Neck Surg. PD AUG PY 1992 VL 118 IS 8 BP 853 EP 858 PG 6 WC Otorhinolaryngology; Surgery SC Otorhinolaryngology; Surgery GA JH494 UT WOS:A1992JH49400016 PM 1642838 ER PT J AU HARRIS, GLH GEISLER, D HARRIS, HC HESSER, JE AF HARRIS, GLH GEISLER, D HARRIS, HC HESSER, JE TI METAL ABUNDANCES FROM WASHINGTON PHOTOMETRY OF GLOBULAR-CLUSTERS IN NGC-5128 SO ASTRONOMICAL JOURNAL LA English DT Article ID EARLY-TYPE GALAXIES; ELLIPTICAL GALAXIES; INFRARED PHOTOMETRY; INTEGRATED-LIGHT; SUPERNOVA 1986G; LOCAL GROUP; SYSTEM; METALLICITY; SPECTROSCOPY; CALIBRATION AB Integrated photometry on the Washington system has been obtained for 62 globular clusters in the nearby peculiar elliptical galaxy NGC 5128; from these data [Fe/H] values accurate to approximately 0.25 dex have been derived based on the C-T1 index. The mean metallicity of [[Fe/H]C-T1] = - 0.8 +/- 0.2 confirms previous indications that the NGC 5128 globular cluster system is at least 0.5 dex more metal rich than that of the Galaxy. Approximately 20% of the clusters are redder than their reddest Galactic counterparts. However, the most metal-rich clusters appear to be only slightly enhanced over solar abundance and not as extreme as suggested by Frogel's infrared observations [ApJ, 278, 119 (1984)], although the difficulties in calibrating metal abundances for such clusters are formidable. Furthermore, in both range of metallicity and mean value, the NGC 5128 cluster system shows a striking similarity to that associated with NGC 1399, the central elliptical in Fornax, suggesting that the process of metal enrichment of a globular cluster system depends more on the parent galaxy's luminosity than on its environment. C1 USN OBSERV,FLAGSTAFF,AZ 86002. NATL RES COUNCIL CANADA,HERZBERG INST ASTROPHYS,DOMINION ASTROPHYS OBSERV,VICTORIA V8X 4M6,BC,CANADA. UNIV WATERLOO,DEPT PHYS,WATERLOO N2L 3G1,ONTARIO,CANADA. RP HARRIS, GLH (reprint author), ASSOC UNIV RES ASTRON INC,NATL OPT ASTRON OBSERV,CERRO TOLOLO INTER AMER OBSERV,CASILLA 603,LA SERENA 1353,CHILE. NR 52 TC 88 Z9 89 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 1992 VL 104 IS 2 BP 613 EP & DI 10.1086/116259 PG 0 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA JF142 UT WOS:A1992JF14200010 ER PT J AU FEY, AL RUSSELL, JL MA, C JOHNSTON, KJ ARCHINAL, BA CARTER, MS HOLDENRIED, ER YAO, Z DEVEGT, C ZACHARIAS, N AF FEY, AL RUSSELL, JL MA, C JOHNSTON, KJ ARCHINAL, BA CARTER, MS HOLDENRIED, ER YAO, Z DEVEGT, C ZACHARIAS, N TI A RADIO OPTICAL REFERENCE FRAME .4. ADDITIONAL RADIO-SOURCE POSITIONS IN THE NORTHERN-HEMISPHERE SO ASTRONOMICAL JOURNAL LA English DT Article ID VLBI; INTERFEROMETRY; CATALOG AB Seventy-seven extragalactic radio sources north of -2-degrees declination have been observed using Mark III Very-Long Baseline Interferometry during 13 experiments from 1988 October to 1989 November. Radio positions derived from these observations supplement an ongoing project to define and maintain an all-sky radio/optical reference frame of 400 or more extragalactic sources with milliarcsecond (mas) accurate radio and optical positions. Positions for 11 new sources are presented along with improved positions for 54 sources already in the reference-frame catalog. An additional five sources have been determined to be unsuitable reference-frame objects. Observations of seven calibration sources tie the new positions to the existing catalog. The radio positions of the new sources have for-mal mean errors of approximately 0.7 mas in each coordinate. Sources for which we report improved positions now have formal errors less-than-or-equal-to 1 mas, an improvement in some cases by as much as 85%. The complementary optical program is addressed briefly. C1 NASA,GODDARD SPACE FLIGHT CTR,GREENBELT,MD 20771. APPL RES CORP,LANDOVER,MD 20785. NASA,GODDARD SPACE FLIGHT CTR,GREENBELT,MD 20771. USN OBSERV,WASHINGTON,DC 20390. UNIV HAMBURG,HAMBURGER STERNWARTE,W-2000 HAMBURG 13,GERMANY. RP FEY, AL (reprint author), USN,RES LAB,CODE 4210,WASHINGTON,DC 20375, USA. RI Ma, Chopo/D-4751-2012 NR 10 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 0004-6256 J9 ASTRON J JI Astron. J. PD AUG PY 1992 VL 104 IS 2 BP 891 EP 896 DI 10.1086/116283 PG 6 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA JF142 UT WOS:A1992JF14200034 ER PT J AU SEELY, JF FELDMAN, U AF SEELY, JF FELDMAN, U TI OBSERVATION OF UPFLOWS DURING SOFT-X-RAY SOLAR-FLARES SO ASTROPHYSICAL JOURNAL LA English DT Article DE SUN, FLARES; SUN, X-RAYS ID GENERAL SPECTRAL PROPERTIES; CHROMOSPHERIC EVAPORATION; IMPULSIVE PHASE; MASS UPFLOW; XIX AB Upflows of the soft X-ray emission regions of four flares located near Sun center have been determined from the blueshift of the absolute wavelength of the Ca XIX resonance lines recorded by the SOLFLEX spectrometer on the P-78 spacecraft. Peak upward velocities were 35-90 km s-1 and occurred during the time of gradual increase in the Ca xix count rate and prior to the peak H-alpha emission. Rises in altitude of 7000-80,000 km were inferred from the upward velocities. RP SEELY, JF (reprint author), USN,RES LAB,EO HULBURT CTR SPACE RES,CODE 4174,WASHINGTON,DC 20375, USA. NR 15 TC 5 Z9 5 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 1992 VL 394 IS 2 BP 697 EP 702 DI 10.1086/171623 PN 1 PG 6 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA JE712 UT WOS:A1992JE71200034 ER PT J AU ALKOV, RA BOROWSKY, MS WILLIAMSON, DW YACAVONE, DW AF ALKOV, RA BOROWSKY, MS WILLIAMSON, DW YACAVONE, DW TI THE EFFECT OF TRANS-COCKPIT AUTHORITY GRADIENT ON NAVY MARINE HELICOPTER MISHAPS SO AVIATION SPACE AND ENVIRONMENTAL MEDICINE LA English DT Article AB Navy and Marine Corps helicopter mishaps which had a pilot causal factor assigned were examined to determine if the relative military rank of the pilot and copilot was associated with the rate of occurrence per 100,000 flight hours. All class A and B helicopter flight mishaps for the 11 calendar year period 1980-1990 were examined. Although no statistically significant differences were noted, pairing pilots who were of equal rank yielded the lowest rate, seemingly refuting Elwyn Edward's notion that a flat "trans-cockpit authority gradient" may lead to greater problems in the cockpit than his hypothetical "optimum gradient." Moreover, when copilots flew with pilots who differed by two or more ranks, the largest pilot error rate was revealed. This last finding seems to support Edward's hypothesis that a steep "trans-cockpit authority gradient" may be detrimental to aviation safety. RP ALKOV, RA (reprint author), USN,CTR SAFETY,DIV AEROMED,BEHAV SCI BRANCH,CODE 143,NORFOLK,VA 23511, USA. NR 6 TC 8 Z9 8 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 1992 VL 63 IS 8 BP 659 EP 661 PG 3 WC Public, Environmental & Occupational Health; Medicine, General & Internal; Sport Sciences SC Public, Environmental & Occupational Health; General & Internal Medicine; Sport Sciences GA JH361 UT WOS:A1992JH36100001 PM 1510637 ER PT J AU MITTLEMAN, KD DOUBT, TJ GRAVITZ, MA AF MITTLEMAN, KD DOUBT, TJ GRAVITZ, MA TI INFLUENCE OF SELF-INDUCED HYPNOSIS ON THERMAL RESPONSES DURING IMMERSION IN 25-DEGREES-C WATER SO AVIATION SPACE AND ENVIRONMENTAL MEDICINE LA English DT Article ID COLD WATER; EXERCISE AB The efficacy of self-induced post-hypnotic suggestion to improve thermogenic responses to head-out immersion in 25-degrees-C wa. ter was evaluated in 12 males. An on-line computerized system permitted the change in body heat storage to be used as the independent variable and immersion time as the dependent variable. Test-retest reliability was good, exhibiting a coefficient of variation of <5% for exposure time. Immersion profiles consisted of the following: rest until 200 kJ of heat were lost, leg exercise at Vo2 approximately 1.5 L . min-1 to regain 200 kJ, rest until 100 kJ were lost, and repeat the exercise to regain 100 kJ. A control immersion was done prior to two 1 -h hypnotic training sessions. A second immersion (hypnotic) occurred within 24 h after training. There were no differences in rates of heat production, heat loss, mean skin temperature, or rectal temperature between control and hypnotic immersions. Individual hypnotic susceptibility scores did not correlate with changes in thermal status. Ratings of perceived exertion during exercise were similar for both immersions, but perceived sensation of cold was lower during the second rest period of the hypnotic immersion. Three subjects used images of warm environments during their hypnotic immersion and lost heat at a faster rate than during control immersions. These results indicate that brief hypnotic training did not enhance the thermogenic response to cool water immersion. C1 USN,MED RES INST,HYPERBAR ENVIRONM ADAPTAT PROGRAM,BETHESDA,MD 20889. NR 31 TC 7 Z9 7 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 1992 VL 63 IS 8 BP 689 EP 695 PG 7 WC Public, Environmental & Occupational Health; Medicine, General & Internal; Sport Sciences SC Public, Environmental & Occupational Health; General & Internal Medicine; Sport Sciences GA JH361 UT WOS:A1992JH36100006 PM 1510642 ER PT J AU CUSHMAN, WB AF CUSHMAN, WB TI A LOW-COST SPATIAL CONTRAST SENSITIVITY DISPLAY DRIVER SO BEHAVIOR RESEARCH METHODS INSTRUMENTS & COMPUTERS LA English DT Article AB The circuit described here can provide the line and frame signals to drive an x, y display scope or oscilloscope at high resolution (1,000 lines) and repetition rate (50 Hz). Synchronizing circuitry at the input of the circuit allows the raster scan to be locked to an input signal, such as the square-wave output from a function generator, while another waveform from the same function generator, the sine output, drives the z (intensity) input of the display scope. A stable spatial contrast display results. Spatial contrast depth is a direct function of z input modulation voltage. Spatial frequency is a direct function of the function generator frequency. The circuit can be used with a programmable function generator under computer control. RP CUSHMAN, WB (reprint author), USN,AEROSP MED RES LAB,NAVAL AIR STN,PENSACOLA,FL 32508, USA. NR 0 TC 1 Z9 1 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 1992 VL 24 IS 3 BP 461 EP 463 DI 10.3758/BF03203581 PG 3 WC Psychology, Mathematical; Psychology, Experimental SC Psychology GA JG543 UT WOS:A1992JG54300014 ER PT J AU WINTER, SF MINNA, JD JOHNSON, BE TAKAHASHI, T GAZDAR, AF CARBONE, DP AF WINTER, SF MINNA, JD JOHNSON, BE TAKAHASHI, T GAZDAR, AF CARBONE, DP TI DEVELOPMENT OF ANTIBODIES AGAINST P53 IN LUNG-CANCER PATIENTS APPEARS TO BE DEPENDENT ON THE TYPE OF P53 MUTATION SO CANCER RESEARCH LA English DT Article ID CLASS-II REGION; CELLULAR PROTEIN P53; FREE DEFINED MEDIUM; ELECTROPHORETIC TRANSFER; CIRCULATING ANTIBODIES; SV40-TRANSFORMED CELLS; POLYACRYLAMIDE GELS; CLINICAL SPECIMENS; ONCOGENE PRODUCT; GENE AB Using immunoblotting techniques we studied the sera from small cell lung cancer and non-small cell lung cancer patients for antibodies directed against p53. We have also characterized the majority of these patients' tumors for p53 mutations. In the sera of 13% of the patients (4 of 40 small cell lung cancer and 2 of 6 non-small cell lung cancer) we found antibodies specific for the p53 tumor suppressor gene product. All of the antibody-positive patients tested had p53 missense mutations and expressed detectable p53 antigen in their tumor cell lines. No anti-p53 antibodies were detected in sera from patients whose tumor had p53 stop, splice/stop, splice, or frameshift mutations (n = 10). Thus, while we find that the ability of lung cancer patients to develop anti-p53 antibodies is correlated with the type of p53 mutation, many patients have tumors with missense p53 mutations and did not develop anti-p53 antibodies. The presence of p53 antibodies was not correlated to stage, prior treatment, sex, or survival. None of these lung cancer patient sera had measurable amounts of p53 antigen. By immunoblotting all six anti-p53 antisera we were able to detect a variety of mutant p53 proteins (including those from antibody-negative patients) and detected wild-type p53 protein. The development of anti-p53 antibodies represents an interesting model system for studying immune responses in cancer patients against mutant oncogene products. C1 UNIV TEXAS,SW MED CTR,SIMMONS CANC CTR,5323 HARRY HINES BLVD,DALLAS,TX 75235. NCI,USN,MED ONCOL BRANCH,BETHESDA,MD 20889. RI Takahashi, Takashi/I-7262-2014 NR 35 TC 317 Z9 323 U1 0 U2 3 PU AMER ASSOC CANCER RESEARCH PI PHILADELPHIA PA PUBLIC LEDGER BLDG, SUITE 816, 150 S. INDEPENDENCE MALL W., PHILADELPHIA, PA 19106 SN 0008-5472 J9 CANCER RES JI Cancer Res. PD AUG 1 PY 1992 VL 52 IS 15 BP 4168 EP 4174 PG 7 WC Oncology SC Oncology GA JF746 UT WOS:A1992JF74600017 PM 1322237 ER PT J AU LAW, WR NADKARNI, VM FLETCHER, MA NEVOLA, JJ ECKSTEIN, JM QUANCE, J MCKENNA, TM LEE, CH WILLIAMS, TJ AF LAW, WR NADKARNI, VM FLETCHER, MA NEVOLA, JJ ECKSTEIN, JM QUANCE, J MCKENNA, TM LEE, CH WILLIAMS, TJ TI PENTOXIFYLLINE TREATMENT OF SEPSIS IN CONSCIOUS YUCATAN MINIPIGS SO CIRCULATORY SHOCK LA English DT Article DE SWINE; LPS; TNF; SHOCK; HEMODYNAMICS ID TUMOR-NECROSIS-FACTOR; LUNG INJURY; PERITONITIS; SURVIVAL; SHOCK AB Recent evidence suggests that pentoxifylline (PTX) may be useful in the treatment of sepsis. We examined effects of PTX in a conscious swine model of sepsis. Yucatan minipigs (20-30 kg) were anesthetized and instrumented with catheters in the vena cava, aortic arch, pulmonary artery (Swan-Ganz thermodilution catheter), and peritoneum. Twenty-four hours after surgery, sepsis was induced by intraperitoneal (ip) injection of Escherichia coli bacteria (2 x 10(10) cfu/kg). Nonseptic pigs received intraperitoneal saline (5 ml/kg). PTX treatment (3 mg/kg/hr, iv; 1 mg/ml in 0.9% saline) and maintenance fluid (5 ml/kg/hr, iv) were started with bacterial infusion. An additional 60 cc/kg 0.9% saline bolus was administered iv at 1 hr. Pigs were monitored before and 1, 2, 5, and 24 hr after bacterial injection. Intraperitoneal injection of bacteria led to significant reductions in blood pressure and cardiac output and elevations in pulmonary wedge pressure and pulmonary vascular resistance. These effects were attenuated by PTX treatment. All septic animals demonstrated elevated creatinine, blood urea nitrogen, circulating endotoxin (LPS), and tumor necrosis factor concentrations, reductions in white blood cell and platelet counts, and peritonitis. None of these responses was altered by PTX treatment. We conclude that PTX may prove to be a useful therapeutic tool in the early treatment of septic shock but is limited in the scope of its effects. C1 USN,MED RES INST,SEPT SHOCK RES GRP,BETHESDA,MD 20814. GEOCENTERS INC,FT WASHINGTON,MD. NR 16 TC 20 Z9 20 U1 0 U2 0 PU WILEY-LISS PI NEW YORK PA DIV JOHN WILEY & SONS INC 605 THIRD AVE, NEW YORK, NY 10158-0012 SN 0092-6213 J9 CIRC SHOCK JI Circ. Shock PD AUG PY 1992 VL 37 IS 4 BP 291 EP 300 PG 10 WC Cardiac & Cardiovascular Systems SC Cardiovascular System & Cardiology GA JG985 UT WOS:A1992JG98500005 PM 1446387 ER PT J AU JORDAN, S AF JORDAN, S TI IS AMERICA ON THE WAY DOWN - (ROUND 3) SO COMMENTARY LA English DT Letter RP JORDAN, S (reprint author), USN,BUR MED & SURG,WASHINGTON,DC 20350, USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER JEWISH COMMITTEE PI NEW YORK PA 165 E 56TH ST, NEW YORK, NY 10022 SN 0010-2601 J9 COMMENTARY JI Commentary PD AUG PY 1992 VL 94 IS 2 BP 9 EP & PG 0 WC Political Science; Social Issues SC Government & Law; Social Issues GA JE612 UT WOS:A1992JE61200014 ER PT J AU OREBAUGH, SL AF OREBAUGH, SL TI VENOUS AIR-EMBOLISM - CLINICAL AND EXPERIMENTAL CONSIDERATIONS SO CRITICAL CARE MEDICINE LA English DT Article DE AIR EMBOLISM, VENOUS; CATHETERS, CENTRAL VENOUS; PRESSURE, INTRATHORACIC; INVASIVE PROCEDURES; DYSPNEA; COMPLICATIONS, IATROGENIC; CATHETER, PULMONARY ARTERY; AIR EMBOLUS, PARADOXICAL; AIR EMBOLISM, CEREBRAL; HYPERBARIC OXYGEN ID MICRO-VASCULAR PERMEABILITY; PULMONARY-ARTERY CATHETER; HYPERBARIC-OXYGEN; GAS EMBOLISM; LUNG; SHEEP; DOGS; COMPLICATIONS; CIRCULATION; INTRODUCER AB Objective: To examine the existing literature concerning venous air embolism. Causes, pathophysiology, and management are emphasized. Data Sources: The literature that was reviewed was retrieved from the MEDLINE System under the headings "venous air embolism," "air embolism," "therapy of air embolism,""etiology of venous air embolism," and "pathophysiology of venous air embolism" for the years 1970 to 1991. A manual search, derived from the references of these papers, was performed to obtain relevant citations for the years preceding 1970. Study Selection: Experimental (animal) data, case reports, case series, and clinical investigations are included. Conclusions: Venous air embolism is an infrequent complication of invasive diagnostic and therapeutic maneuvers. The cardiovascular, pulmonary, and central nervous systems may all be affected, with severity ranging from no symptoms to immediate cardiovascular collapse. Therapeutic interventions include mechanical measures, such as positioning, withdrawal of air from the right atrium, and measures aimed at reducing bubble size. Hyperbaric oxygen therapy holds some promise in accomplishing the latter, but randomized, controlled trials demonstrating efficacy have yet to be performed. C1 USN HOSP,DEPT EMERGENCY MED,SAN DIEGO,CA 92134. RP OREBAUGH, SL (reprint author), USN HOSP,DEPT CLIN INVEST,SAN DIEGO,CA 92134, USA. NR 94 TC 133 Z9 135 U1 1 U2 4 PU WILLIAMS & WILKINS PI BALTIMORE PA 351 WEST CAMDEN ST, BALTIMORE, MD 21201-2436 SN 0090-3493 J9 CRIT CARE MED JI Crit. Care Med. PD AUG PY 1992 VL 20 IS 8 BP 1169 EP 1177 DI 10.1097/00003246-199208000-00017 PG 9 WC Critical Care Medicine SC General & Internal Medicine GA JJ154 UT WOS:A1992JJ15400017 PM 1643897 ER PT J AU SUFLITA, JM GERBA, CP HAM, RK PALMISANO, AC RATHJE, WL ROBINSON, JA AF SUFLITA, JM GERBA, CP HAM, RK PALMISANO, AC RATHJE, WL ROBINSON, JA TI THE WORLDS LARGEST LANDFILL - A MULTIDISCIPLINARY INVESTIGATION SO ENVIRONMENTAL SCIENCE & TECHNOLOGY LA English DT Article ID SULFATE-REDUCING BACTERIA; DAY-CARE; METHANOGENIC BACTERIA; WATER; SAMPLES; CRYPTOSPORIDIOSIS; GIARDIASIS; COMMUNITY; FILTERS; REFUSE C1 UNIV ARIZONA,DEPT MICROBIOL & IMMUNOL,TUCSON,AZ 85721. UNIV WISCONSIN,MADISON,WI 53706. OFF NAVAL RES,ARLINGTON,VA 22217. UNIV ARIZONA,DEPT ANTHROPOL,TUCSON,AZ 85721. UPJOHN CO,KALAMAZOO,MI 49001. RP SUFLITA, JM (reprint author), UNIV OKLAHOMA,DEPT BOT & MICROBIOL,NORMAN,OK 73019, USA. NR 61 TC 62 Z9 65 U1 2 U2 5 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0013-936X J9 ENVIRON SCI TECHNOL JI Environ. Sci. Technol. PD AUG PY 1992 VL 26 IS 8 BP 1486 EP 1495 DI 10.1021/es00032a002 PG 10 WC Engineering, Environmental; Environmental Sciences SC Engineering; Environmental Sciences & Ecology GA JF520 UT WOS:A1992JF52000005 ER PT J AU EIL, C AF EIL, C TI KETOCONAZOLE BINDS TO THE HUMAN ANDROGEN RECEPTOR SO HORMONE AND METABOLIC RESEARCH LA English DT Article DE KETOCONAZOLE; ANDROGEN RECEPTORS; ANTIANDROGEN; SKIN FIBROBLASTS ID TESTOSTERONE BIOSYNTHESIS; CUSHINGS-SYNDROME; INHIBITION; THERAPY; STEROIDOGENESIS; SPIRONOLACTONE; SECRETION; PROTEINS; INVITRO; ENZYMES AB Ketoconazole, an imidazole anti-fungal agent, has often produced features of androgen deficiency including decreased libido, gynecomastia, impotence, oligospermia, and decreased testosterone levels, in men being treated for chronic mycotic infections. Based on these potent effects on gonadal function in vivo as well as previous work in vitro demonstrating affinity of ketoconazole for receptor proteins for glucocorticoids and 1,25(OH)2vitamin D3 and for sex steroid binding globulin (SSBG), the binding of ketoconazole to human androgen receptors (AR) in vitro was also examined. Ketoconazole competition with [H-3]methyltrienolone (R1881) for androgen binding sites in dispersed, intact cultured human skin fibroblasts was determined at 22-degrees-C. Fifty percent displacement of [H-3]R1881 binding to AR was achieved by 6.4+/-1.8 (SE) x 10(-5) M ketoconazole. Additional binding studies performed with ketoconazole in the presence of increasing amounts of [H-3]R1881 showed that the interaction of ketoconazole with AR was competitive when the data were analyzed by the Scatchard method. It should be noted, however, that the dose of ketoconazole required for 50% occupancy of the androgen receptor is not likely to be achieved in vivo, at least in plasma. Finally, androgen binding studies performed with other imidazoles, such as clotrimazole, miconazole, and fluconozole, revealed that in this class of compounds only ketoconazole appears to interact with the androgen receptor. C1 USN HOSP,DEPT INTERNAL MED,ENDOCRINOL METAB BRANCH,BETHESDA,MD 20814. UNIFORMED SERV UNIV HLTH SCI,BETHESDA,MD 20814. NR 28 TC 21 Z9 21 U1 0 U2 3 PU GEORG THIEME VERLAG PI STUTTGART PA P O BOX 30 11 20, D-70451 STUTTGART, GERMANY SN 0018-5043 J9 HORM METAB RES JI Horm. Metab. Res. PD AUG PY 1992 VL 24 IS 8 BP 367 EP 370 DI 10.1055/s-2007-1003337 PG 4 WC Endocrinology & Metabolism SC Endocrinology & Metabolism GA JK158 UT WOS:A1992JK15800004 PM 1526623 ER PT J AU MEISTER, D ENDERWICK, TP AF MEISTER, D ENDERWICK, TP TI MEASUREMENT IN HUMAN-FACTORS - SPECIAL ISSUE PREFACE SO HUMAN FACTORS LA English DT Editorial Material RP MEISTER, D (reprint author), USN,CTR COMMAND CONTROL & OCEAN SURVEILLANCE,DIV RES & DEV,SAN DIEGO,CA 92132, USA. NR 3 TC 2 Z9 2 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 AUG PY 1992 VL 34 IS 4 BP 383 EP 385 PG 3 WC Behavioral Sciences; Engineering, Industrial; Ergonomics; Psychology, Applied; Psychology SC Behavioral Sciences; Engineering; Psychology GA JK876 UT WOS:A1992JK87600001 ER PT J AU BAKER, DP SALAS, E AF BAKER, DP SALAS, E TI PRINCIPLES FOR MEASURING TEAMWORK SKILLS SO HUMAN FACTORS LA English DT Article ID PERFORMANCE AB Performance measurement research has characteristically focused on the performance of individuals and has not addressed the measurement of teamwork skills. Dyer suggested that this lack of teamwork measures presents serious problems for conducting team-oriented research because research efforts are often judged by the quality of the measurement device employed. In an effort to assess and advance the science of measuring teamwork, the current review examines the measurement of teamwork skills on theoretical, methodological, and psychometric grounds. Furthermore, we present a series of general principles to guide research in the future. Although some progress has been made, there is still much to be learned about the measurement of teamwork. RP BAKER, DP (reprint author), USN,CTR TRAINING SYST,DIV HUMAN FACTORS,CODE 262,12350 RES PKWY,ORLANDO,FL 32826, USA. NR 27 TC 43 Z9 43 U1 14 U2 22 PU HUMAN FACTORS SOC PI SANTA MONICA PA BOX 1369, SANTA MONICA, CA 90406 SN 0018-7208 J9 HUM FACTORS JI Hum. Factors PD AUG PY 1992 VL 34 IS 4 BP 469 EP 475 PG 7 WC Behavioral Sciences; Engineering, Industrial; Ergonomics; Psychology, Applied; Psychology SC Behavioral Sciences; Engineering; Psychology GA JK876 UT WOS:A1992JK87600008 ER PT J AU GOLDBERG, L ESMAN, RD WILLIAMS, KJ AF GOLDBERG, L ESMAN, RD WILLIAMS, KJ TI GENERATION AND CONTROL OF MICROWAVE SIGNALS BY OPTICAL TECHNIQUES SO IEE PROCEEDINGS-J OPTOELECTRONICS LA English DT Article DE OPTICAL CONTROL OF MICROWAVES ID INJECTION-LOCKING; GAALAS LASERS; PHASE; OSCILLATORS; FREQUENCY; GHZ AB Optical techniques for microwave signal generation and optical control of microwave devices are described. Optical generation of microwave signals to 35 GHz and above by coherent heterodyne was carried out by FM sideband injection locking of laser diodes and by offset frequency phase locking of solid state lasers. Applications of optically generated microwave signals including optical control of phased array radar and photodetector characterisation are discussed. Optical injection locking, phase control, and phase locking of microwave oscillators are also presented. RP GOLDBERG, L (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 36 TC 56 Z9 57 U1 0 U2 5 PU IEE-INST ELEC ENG PI HERTFORD PA MICHAEL FARADAY HOUSE SIX HILLS WAY STEVENAGE, HERTFORD, ENGLAND SG1 2AY SN 0267-3932 J9 IEE PROC-J PD AUG PY 1992 VL 139 IS 4 BP 288 EP 295 PG 8 WC Engineering, Electrical & Electronic; Optics; Telecommunications SC Engineering; Optics; Telecommunications GA JM498 UT WOS:A1992JM49800009 ER PT J AU BURNS, WK AF BURNS, WK TI SHAPING THE DIGITAL SWITCH SO IEEE PHOTONICS TECHNOLOGY LETTERS LA English DT Article ID OPTICAL SWITCH AB A procedure is given for shaping 1 X 2 digital switches on x- or y-cut LiNbO3 / LiTaO3 for prescribed values of crosstalk in order to reduce the voltage-length product. The method is based on a normal mode analysis using ordinary coupled mode theory parameters and a known solution for shaped branches. A factor of three improvement in voltage-length product is obtained, compared to linear branches. RP BURNS, WK (reprint author), USN,RES LAB,CODE 6570,WASHINGTON,DC 20375, USA. NR 8 TC 16 Z9 17 U1 0 U2 1 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 1041-1135 J9 IEEE PHOTONIC TECH L JI IEEE Photonics Technol. Lett. PD AUG PY 1992 VL 4 IS 8 BP 861 EP 863 DI 10.1109/68.149888 PG 3 WC Engineering, Electrical & Electronic; Optics; Physics, Applied SC Engineering; Optics; Physics GA JH068 UT WOS:A1992JH06800016 ER PT J AU SERAKOS, D AF SERAKOS, D TI STABILITY IN FEEDBACK-SYSTEMS WITH TAPERED AND OTHER SPECIAL INPUT SPACES SO IEEE TRANSACTIONS ON AUTOMATIC CONTROL LA English DT Note AB In this note the effect of weighted input and output spaces on the stability of feedback systems is examined. For a weighted space, the recent past of a signal is emphasized and the remote past is deemphasized. Tapered spaces are a subclass of weighted spaces. Results concerning weighted spaces used on linear systems are given. The circle conditions are recovered for feedback systems with exponentially tapered spaces. RP SERAKOS, D (reprint author), USN,CTR SURFACE WARFARE,SYST ENGN BRANCH,DAHLGREN,VA 22448, USA. NR 8 TC 0 Z9 0 U1 0 U2 0 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0018-9286 J9 IEEE T AUTOMAT CONTR JI IEEE Trans. Autom. Control PD AUG PY 1992 VL 37 IS 8 BP 1256 EP 1260 DI 10.1109/9.151121 PG 5 WC Automation & Control Systems; Engineering, Electrical & Electronic SC Automation & Control Systems; Engineering GA JH877 UT WOS:A1992JH87700032 ER PT J AU KENNEY, CS OVERFELT, PL AF KENNEY, CS OVERFELT, PL TI OPTIMIZING WAVE-GUIDE CROSS-SECTIONS WITH RESPECT TO POWER HANDLING CAPABILITY SO IEEE TRANSACTIONS ON ELECTROMAGNETIC COMPATIBILITY LA English DT Article ID WAVE-GUIDES AB This paper discusses the problem of optimizing power transmission through uniform perfectly conducting waveguides of doubly symmetric cross section. Using an efficiency factor specifically created (Baum (1988)) for single-mode propagagtion in uniform waveguides, we (Overfelt and Kenney (1990)) have developed a unique method of geometric parametrization that determines the waveguide cross-sectional size and shape resulting in maximum power transmission between a source and receiver. Our analysis of the power-handling capabilities of four families of waveguide cross-sectional shapes, including rectangular, elliptical, parabolic, and rhombic is given. Using an efficiency factor based on the two lowest TE modes, we can see that elliptical waveguides can be slightly better than the standard 2:1 rectangular waveguide and that for the four waveguides considered, power-handling is maximized when the second and third TE mode eigenvalues are equal. Because this efficiency factor is relatively insensitive to slight variations in cross-sectional shape, we can make good estimates of power-handling capability by comparison with rectangular shapes or other simple geometries of the same aspect ratio. C1 USN,CTR AIR WARFARE,RES DEPT,DIV PHYS,CHINA LAKE,CA 93555. UNIV CALIF SANTA BARBARA,DEPT ELECT & COMP ENGN,SANTA BARBARA,CA 93106. RP KENNEY, CS (reprint author), USN,CTR AIR WARFARE,RES DEPT,APPL MATH RES GRP,CHINA LAKE,CA 93555, USA. NR 20 TC 2 Z9 2 U1 0 U2 0 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0018-9375 J9 IEEE T ELECTROMAGN C JI IEEE Trans. Electromagn. Compat. PD AUG PY 1992 VL 34 IS 3 BP 214 EP 221 DI 10.1109/15.155832 PN 1 PG 8 WC Engineering, Electrical & Electronic; Telecommunications SC Engineering; Telecommunications GA JJ864 UT WOS:A1992JJ86400011 ER PT J AU KRALL, J FRIEDMAN, M LAU, YY SERLIN, V AF KRALL, J FRIEDMAN, M LAU, YY SERLIN, V TI SIMULATION STUDIES OF A KLYSTRON-LIKE AMPLIFIER OPERATING IN THE 10-100 GW REGIME SO IEEE TRANSACTIONS ON ELECTROMAGNETIC COMPATIBILITY LA English DT Article ID RELATIVISTIC ELECTRON-BEAMS; EXTERNAL MICROWAVE SOURCE; SPACE-CHARGE WAVES; POWER; ACCELERATION; GENERATION; MODULATION AB A coaxial drift tube allows propagation of an ultra high-power relativistic electron beam (500 keV, greater-than-or-equal-to 100 kA, 100 ns). In this paper we study the modulation of a large diameter (12.6 cm) intense relativistic electron beam (500 keV, 16 kA) by an external microwave source via particle simulation. The annular beam, enclosed within a coaxial drift tube, is found to be fully modulated by a low-power external rf source at a frequency of 1.3 GHz. We show that for such an intense beam, a highly nonlinear interaction takes place at the modulating gap, producing highly coherent bunches of electrons. This finding is similar to earlier research in which such modulation was studied for an intense beam propagating in a hollow drift tube. We further show that, unlike the hollow drift tube case, the coaxial configuration is easily scaled to high power. Here, a very large diameter (26 cm) intense beam (460 keV, 100 kA) is fully modulated at 1.3 GHz to obtain 31 GW of rf beam power. RP KRALL, J (reprint author), USN,RES LAB,DIV PLASMA PHYS,WASHINGTON,DC 20375, USA. NR 20 TC 7 Z9 7 U1 0 U2 0 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0018-9375 J9 IEEE T ELECTROMAGN C JI IEEE Trans. Electromagn. Compat. PD AUG PY 1992 VL 34 IS 3 BP 222 EP 228 DI 10.1109/15.155833 PN 1 PG 7 WC Engineering, Electrical & Electronic; Telecommunications SC Engineering; Telecommunications GA JJ864 UT WOS:A1992JJ86400012 ER PT J AU HOW, H SEED, RG VITTORIA, C CHRISEY, DB HORWITZ, JS CAROSELLA, C FOLEN, V AF HOW, H SEED, RG VITTORIA, C CHRISEY, DB HORWITZ, JS CAROSELLA, C FOLEN, V TI MICROWAVE CHARACTERISTICS OF HIGH-TC SUPERCONDUCTING COPLANAR WAVE-GUIDE RESONATOR SO IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES LA English DT Article ID THIN-FILMS; MICROSTRIP AB A theoretical formulation has been developed to calculate the coupling coefficient, London penetration depth, and surface resistance of a coplanar waveguide resonator fabricated from films of superconducting YBCO material. Experimental data of the reflection coefficient as a function of temperature and frequency agree reasonably well with calculations. The formulation is of sufficient generality to be applicable to other guided structures. C1 USN,RES LAB,WASHINGTON,DC 20375. RP HOW, H (reprint author), NORTHEASTERN UNIV,DEPT ELECT & COMP ENGN,MICROWAVE MAT GRP,409 DANA RES BLDG,BOSTON,MA 02115, USA. NR 9 TC 18 Z9 18 U1 1 U2 1 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0018-9480 J9 IEEE T MICROW THEORY JI IEEE Trans. Microw. Theory Tech. PD AUG PY 1992 VL 40 IS 8 BP 1668 EP 1673 DI 10.1109/22.149546 PG 6 WC Engineering, Electrical & Electronic SC Engineering GA JG713 UT WOS:A1992JG71300009 ER PT J AU OVERFELT, PL KENNEY, CS AF OVERFELT, PL KENNEY, CS TI POWER-HANDLING CAPABILITY OF THE RHOMBIC WAVE-GUIDE - REPLY TO COMMENTS SO IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES LA English DT Letter RP OVERFELT, PL (reprint author), USN,CTR AIR WARFARE,RES DEPT,CHINA LAKE,CA 93555, USA. NR 3 TC 0 Z9 0 U1 0 U2 0 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0018-9480 J9 IEEE T MICROW THEORY JI IEEE Trans. Microw. Theory Tech. PD AUG PY 1992 VL 40 IS 8 BP 1733 EP 1733 PG 1 WC Engineering, Electrical & Electronic SC Engineering GA JG713 UT WOS:A1992JG71300022 ER PT J AU BARNER, M MESSING, LT SEGAL, S AF BARNER, M MESSING, LT SEGAL, S TI INHIBITION OF MURINE ERYTHROLEUKEMIA CELL-DIFFERENTIATION BY NORMAL AND PARTIALLY DELETED C-MYC GENES SO IMMUNOBIOLOGY LA English DT Article; Proceedings Paper CT 7TH SYMP ON SIGNALS AND SIGNAL PROCESSING IN THE IMMUNE SYSTEM CY SEP, 1991 CL KOSZEG, HUNGARY ID DNA-BINDING; TRANSFORMING ACTIVITY; EMBRYO FIBROBLASTS; LEUCINE ZIPPER; N-MYC; PROTEIN; EXPRESSION; RAS; ONCOGENES; COTRANSFORMATION AB In our study of normal and partially deleted myc genes we found that N-myc, similarly to L-myc, can substitute for c-myc and inhibit MEL cell differentiation. All of the known putative functional domains of c-myc seem to be required for this inhibition. It is conceivable that c-myc inhibits differentiation by a mechanism that is related to its normal role in the cell, possibly by regulating transcription of genes involved in growth promotion. As was previously found for all of the other known activities of c-Mvc, the HLH and LZ dimerization motifs are absolutely necessary for inhibition of MEL cell differentiation. Heterodimerization of Myc with Max or Max-like proteins could be a prerequisite for such inhibition. It is, therefore, of interest to study the regulation of max in MEL cells expressing normal and deregulated myc genes. C1 NCI,USN,MED ONCOL BRANCH,BETHESDA,MD 20889. UNIFORMED SERV UNIV HLTH SCI,USN,NATL MED CTR,DEPT MED,BETHESDA,MD 20889. NR 34 TC 2 Z9 2 U1 0 U2 0 PU GUSTAV FISCHER VERLAG PI JENA PA VILLENGANG 2, D-07745 JENA, GERMANY SN 0171-2985 J9 IMMUNOBIOLOGY JI Immunobiology PD AUG PY 1992 VL 185 IS 2-4 BP 150 EP 158 PG 9 WC Immunology SC Immunology GA JL906 UT WOS:A1992JL90600003 PM 1452198 ER PT J AU MILLET, P CHIZZOLINI, C PIENIAZEK, NJ CHAROENVIT, Y NAKAMURA, K AIKAWA, M JONES, TR HOFFMAN, SL COLLINS, WE AF MILLET, P CHIZZOLINI, C PIENIAZEK, NJ CHAROENVIT, Y NAKAMURA, K AIKAWA, M JONES, TR HOFFMAN, SL COLLINS, WE TI A MONOCLONAL-ANTIBODY DIRECTED AGAINST THE SPOROZOITE STAGE OF PLASMODIUM-VIVAX BINDS TO LIVER PARENCHYMAL-CELLS SO IMMUNOLOGY LETTERS LA English DT Article DE PLASMODIUM-VIVAX; MAJOR HISTOCOMPATIBILITY COMPLEX CLASS-I; HEPATOCYTE; MONOCLONAL ANTIBODY ID CIRCUMSPOROZOITE PROTEIN; SEQUENCE; COMPLEX; GENE AB The circumsporozoite (CS) protein of malaria parasites is a major surface protein of the sporozoite stage. In the process of investigating the immunogenicity of this protein in the Plasmodium vivax complex, we found that a monoclonal antibody (mAb) directed against the CS protein of isolates of P. vivax recognizes New World monkey hepatocytes and human hepatoma cells HepG2A16 in Western blot and by immunoelectron microscopy. The mAb NVS3 binds to the amino acid sequence AGDR, which is also shared with the alpha3 domain of the human and primate major histocompatibility complex class I. In addition, in vitro experiments suggest that the binding of the mAb NVS3 to hepatocytes from Saimiri monkey enhances the invasion or development of malaria sporozoites. These results form the basis for investigating the relationships between parasite surface proteins and host-cell receptors. C1 USN,MED RES INST,DEPT INFECT DIS,MALARIA PROGRAM,BETHESDA,MD 20814. CASE WESTERN RESERVE UNIV,DEPT PATHOL,CLEVELAND,OH 44106. RP MILLET, P (reprint author), CTR DIS CONTROL,CTR INFECT DIS,DIV PARASIT DIS,ATLANTA,GA 30333, 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 0165-2478 J9 IMMUNOL LETT JI Immunol. Lett. PD AUG PY 1992 VL 33 IS 3 BP 289 EP 294 DI 10.1016/0165-2478(92)90075-Y PG 6 WC Immunology SC Immunology GA JP579 UT WOS:A1992JP57900012 PM 1428005 ER PT J AU MAJDE, JA AF MAJDE, JA TI ENDOTOXIN DETECTION SO IMMUNOLOGY TODAY LA English DT Letter ID TUMOR-NECROSIS-FACTOR; MOUSE SPLEEN-CELLS; INTERLEUKIN-1; MICE RP MAJDE, JA (reprint author), OFF NAVAL RES,CODE 1141SB,800 N QUINCY ST,ARLINGTON,VA 22217, USA. NR 10 TC 12 Z9 12 U1 0 U2 0 PU ELSEVIER SCI LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, OXON, ENGLAND OX5 1GB SN 0167-5699 J9 IMMUNOL TODAY JI Immunol. Today PD AUG PY 1992 VL 13 IS 8 BP 328 EP 329 DI 10.1016/0167-5699(92)90047-B PG 2 WC Immunology SC Immunology GA JG118 UT WOS:A1992JG11800011 PM 1510815 ER PT J AU MAYERS, DL MCCUTCHAN, FE SANDERSBUELL, EE MERRITT, LI DILWORTH, S FOWLER, AK MARKS, CA RUIZ, NM RICHMAN, DD ROBERTS, CR BURKE, DS AF MAYERS, DL MCCUTCHAN, FE SANDERSBUELL, EE MERRITT, LI DILWORTH, S FOWLER, AK MARKS, CA RUIZ, NM RICHMAN, DD ROBERTS, CR BURKE, DS TI CHARACTERIZATION OF HIV ISOLATES ARISING AFTER PROLONGED ZIDOVUDINE THERAPY SO JOURNAL OF ACQUIRED IMMUNE DEFICIENCY SYNDROMES AND HUMAN RETROVIROLOGY LA English DT Article DE ZIDOVUDINE RESISTANCE; REVERSE TRANSCRIPTASE; DNA SEQUENCE; SUSCEPTIBILITY ASSAY ID HUMAN-IMMUNODEFICIENCY-VIRUS; REVERSE-TRANSCRIPTASE; REDUCED SENSITIVITY; AZT THERAPY; AIDS; MUTAGENESIS; RESISTANCE; MUTATIONS; PATIENT; DOMAIN AB Human immunodeficiency virus type 1 (HIV-1) was isolated from five patients with late-stage disease treated with zidovudine (ZDV) for more than 1 year. Peripheral blood mononuclear cells (PBMCs) were used for all virus isolations and to assay for drug resistance. The isolates exhibited a 10- to 100-fold decrease in ZDV susceptibility compared to pretreatment isolates. Multiple clones of a 618 bp segment of the HIV reverse transcriptase gene encompassing codons 60-250 were sequenced for each isolate. The association of alterations at codons Asp67 --> Asn, Lys70 --> Arg, Thr215 --> Phe or Tyr, and Lys219 --> Gln with ZDV resistance has been previously noted (ref. 5). In this study, the most frequent alteration was Thr215 --> Tyr although genotypic mixtures of Thr/Tyr and Phe/Tyr were also observed. One isolate with a Tyr215 alteration and unaltered codons at 67, 70, and 219 had high-level ZDV resistance. Alterations at codons 67, 70, and 219 did not appear to increase resistance when seen in combination with Tyr215. Virus isolates obtained from each patient by cultivation with either 0 or 4-mu-M ZDV were compared and found to have similar alterations at codons 67, 70, 215, and 219, although one instance of apparent in vitro selection for Tyr215 over Phe215 was observed. Assays using PBMCs for virus propagation will permit susceptibility testing of HIV isolates from most patients on antiretroviral drugs to investigate the clinical significance of drug resistance. C1 USN,MED RES INST,BETHESDA,MD 20814. HENRY M JACKSON FDN ADVANCEMENT MIL MED,ROCKVILLE,MD. SRA TECHNOL INC,ROCKVILLE,MD. UNIV CALIF SAN DIEGO,DEPT PATHOL & MED,LA JOLLA,CA 92093. VET AFFAIRS MED CTR,DEPT PATHOL & MED,SAN DIEGO,CA. WALTER REED ARMY MED CTR,DIV RETROVIROL,WASHINGTON,DC 20307. OI /0000-0002-5704-8094 NR 30 TC 56 Z9 56 U1 0 U2 0 PU LIPPINCOTT-RAVEN PUBL PI PHILADELPHIA PA 227 EAST WASHINGTON SQ, PHILADELPHIA, PA 19106 SN 1077-9450 J9 J ACQ IMMUN DEF SYND JI J. Acquir. Immune Defic. Syndr. Hum. Retrovirol. PD AUG PY 1992 VL 5 IS 8 BP 749 EP 759 PG 11 WC Immunology; Infectious Diseases SC Immunology; Infectious Diseases GA JE582 UT WOS:A1992JE58200001 PM 1381438 ER PT J AU STERN, KH AF STERN, KH TI ELECTRODEPOSITION OF REFRACTORY CARBIDE COATINGS FROM FLUORIDE MELTS SO JOURNAL OF APPLIED ELECTROCHEMISTRY LA English DT Article ID MOLTEN FLUORIDES; TANTALUM; ION AB Experimental studies relevant to the electrodeposition of the carbides of vanadium, niobium, titanium, and zirconium are reported. These focus on choices of suitable metal precursors, their solubility and reducibility. The state of knowledge in the field is summarized. RP STERN, KH (reprint author), USN,RES LAB,DIV CHEM,WASHINGTON,DC 20375, USA. NR 29 TC 15 Z9 15 U1 1 U2 6 PU CHAPMAN HALL LTD PI LONDON PA 2-6 BOUNDARY ROW, LONDON, ENGLAND SE1 8HN SN 0021-891X J9 J APPL ELECTROCHEM JI J. Appl. Electrochem. PD AUG PY 1992 VL 22 IS 8 BP 717 EP 721 DI 10.1007/BF01027499 PG 5 WC Electrochemistry SC Electrochemistry GA JG134 UT WOS:A1992JG13400006 ER PT J AU BURK, SD THOMPSON, WT AF BURK, SD THOMPSON, WT TI AIRMASS MODIFICATION OVER THE GULF OF MEXICO - MESOSCALE MODEL AND AIRMASS TRANSFORMATION MODEL FORECASTS SO JOURNAL OF APPLIED METEOROLOGY LA English DT Article ID WEATHER PREDICTION MODEL; SEA; PARAMETERIZATION; CONDENSATION AB Several numerical models are used to examine strong air-sea fluxes and resultant airmass modification following a cold-frontal passage over the Gulf of Mexico. Data from the Gulf of Mexico Experiment (GUFMEX), which was conducted in February-March 1988, are used for model validation. To provide a benchmark by which to evaluate the role of diabatic processes in airmass modification, the mesoscale model was initially run with surface fluxes deleted. Subsequent full physics runs show profound alterations to the boundary layer due to the diabatic processes. A one-dimensional airmass transformation (AMT) boundary-layer model is also tested and compared with the mesoscale model and GUFMEX data. The Lagrangian character of the AMT model is a useful compliment to the mesoscale model output. Further, at least in one forecast, the AMT model yields a better forecast of boundary-layer depth. Strong sensible and latent heat fluxes in the vicinity of the cold front act frontolytically, while a subsidence-induced local maximum in latent heat flux appears in the return flow that is established in the western Gulf The precipitable-water field shows a tongue of moist air returning to the Louisiana coast and indicates that substantial mesoscale horizontal gradients in the moisture field are to be expected in the return flow. RP USN, OCEAN & ATMOSPHER RES LAB, ATMOSPHER DIRECTORATE, MONTEREY, CA 93943 USA. NR 16 TC 6 Z9 6 U1 0 U2 0 PU AMER METEOROLOGICAL SOC PI BOSTON PA 45 BEACON ST, BOSTON, MA 02108-3693 USA SN 0894-8763 J9 J APPL METEOROL JI J. Appl. Meteorol. PD AUG PY 1992 VL 31 IS 8 BP 925 EP 937 DI 10.1175/1520-0450(1992)031<0925:AMOTGO>2.0.CO;2 PG 13 WC Meteorology & Atmospheric Sciences SC Meteorology & Atmospheric Sciences GA JH999 UT WOS:A1992JH99900010 ER PT J AU DAVIDSON, KL BOYLE, PJ GUEST, PS AF DAVIDSON, KL BOYLE, PJ GUEST, PS TI ATMOSPHERIC BOUNDARY-LAYER PROPERTIES AFFECTING WIND FORECASTING IN COASTAL REGIONS SO JOURNAL OF APPLIED METEOROLOGY LA English DT Article; Proceedings Paper CT SYMP ON AIR-SEA INTERACTION AND AIRMASS MODIFICATION OVER THE GULF OF MEXICO CY JAN 07-09, 1991 CL GALVESTON, TX SP TEXAS INST OCEANOG, INST NAVAL OCEANOG, NATL WEATHER SERV, SO REG, COOPERAT INST APPL METEOROL STUDIES ID DRAG COEFFICIENT; SEA; STRESS; ROUGHNESS; SCALE; WAVES; FLUX; FLOW; JET; ICE AB Atmospheric boundary-layer properties and processes in gulf and coastal regions have special characteristics that are important in forecasting winds and ocean forcing. Accurate coastal-wind predictions require knowledge of local responses to a given synoptic-forcing scenario. The overwater surface roughness effect on wind stress, specified by a neutral drag coefficient, for a 15 m s-1 surface wind averages 25% higher in coastal regions than in open-ocean regions. The change in sea state associated with a sharp sea surface temperature gradient (front) caused a 10%-20% increase in neutral drag coefficient. Sea-state and wind-wave orientation changes associated with an atmospheric cold front increased the neutral drag coefficient by a factor of 2 for a 3-4-h period following the frontal passage. The effect of increased drag coefficient on surface wind speed is to slow it down by an amount that depends on the height of the inversion base and other processes within the boundary layer. An example of a coastal jet shows complications in the wind field associated with horizontal air temperature changes in the atmospheric boundary layer. RP DAVIDSON, KL (reprint author), USN,SCH POSTGRAD,DEPT METEOROL,MONTEREY,CA 93943, USA. NR 22 TC 10 Z9 10 U1 0 U2 3 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 1992 VL 31 IS 8 BP 983 EP 994 DI 10.1175/1520-0450(1992)031<0983:ABLPAW>2.0.CO;2 PG 12 WC Meteorology & Atmospheric Sciences SC Meteorology & Atmospheric Sciences GA JH999 UT WOS:A1992JH99900014 ER PT J AU PAVLOPOULOS, TG AF PAVLOPOULOS, TG TI TRIPLET EXTINCTION COEFFICIENTS OF SOME ORGANIC-COMPOUNDS SO JOURNAL OF APPLIED PHYSICS LA English DT Article ID LASER-DYES AB The triplet extinction coefficients epsilon(T) of acridine, anthracene, benzanthracene, dibenzanthracene, chrysene, pyrene, and pyrene caroxaldehyde were measured at the visible spectral region at maximum triplet-triplet absorption. We used McClure's method together with cw lasers as excitation sources to obtain the epsilon(T) values. Because these triplet extinction coefficients were measured with improved accuracy, we suggest that these compounds be used as standards. We wanted to compare the accuracy of our values with the ones suggested as tentative standards. Further, we tested the validity of McClure's method on anthracene by increasing the cw laser excitation intensities (power) I(ex) and recording triplet optical densities OD(T). Under the experimental conditions we used, about 100 mW of cw laser power appears to be the upper limit. RP PAVLOPOULOS, TG (reprint author), USN,CTR COMMAND CONTROL & OCEAN SURVEILLANCE,SAN DIEGO,CA 92152, USA. NR 7 TC 6 Z9 6 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 AUG 1 PY 1992 VL 72 IS 3 BP 845 EP 848 DI 10.1063/1.351757 PG 4 WC Physics, Applied SC Physics GA JF868 UT WOS:A1992JF86800003 ER PT J AU HALLOCK, ZR TEAGUE, WJ AF HALLOCK, ZR TEAGUE, WJ TI THE FALL RATE OF THE T-7 XBT SO JOURNAL OF ATMOSPHERIC AND OCEANIC TECHNOLOGY LA English DT Article AB A theoretical model of expendable bathythermograph (XBT) fall rate is reviewed, and a new form of fall-rate equation is proposed to include near-surface transient effects. Comparisons are made of T-7 XBT and CTD (conductivity, temperature, and depth) depths of thermohaline features off Barbados. Fall-rate equation coefficients are derived and compared with the manufacturer-supplied coefficients. As other investigators have found, the Sippican equation consistently underestimates probe depth by as much as 35 m at 760 m. Analysis yields a new equation, Z = 6.798t - 0.002383t2 - 4.01, for depths greater than about 10 m. Considerable probe-to-probe variability is noted and is found to be primarily the result of differences in the linear term or terminal velocity of the probes; variation in effective drag resulting from probe irregularities is the likely cause. Recommendations for additional work are made. RP HALLOCK, ZR (reprint author), USN,NAVAL OCEANOG & ATMOSPHER RES LAB,BAY ST LOUIS,MS 39529, USA. NR 0 TC 22 Z9 25 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 AUG PY 1992 VL 9 IS 4 BP 470 EP 483 DI 10.1175/1520-0426(1992)009<0470:TFROTT>2.0.CO;2 PG 14 WC Engineering, Ocean; Meteorology & Atmospheric Sciences SC Engineering; Meteorology & Atmospheric Sciences GA KE849 UT WOS:A1992KE84900012 ER PT J AU CHANDRASEKHAR, I GABER, BP NAGUMO, M AF CHANDRASEKHAR, I GABER, BP NAGUMO, M TI LIPID CONFORMATIONAL NOMENCLATURE - A GENERAL-METHOD SO JOURNAL OF BIOMOLECULAR STRUCTURE & DYNAMICS LA English DT Article AB We propose a conformational nomenclature for amphiphilic lipid molecules that is general and compatible with the stereospecific numbering scheme, in contrast to earlier methods in which discrepancies with the sn-scheme lead to contradictory assignments of the absolute configuration of the system. The present method can be rationally extended to different classes of lipids, both natural and synthetic. It is simple and provides a convenient framework for conformational studies on widely varying classes of lipids. C1 USN,RES LAB,CTR BIOMOLEC SCI & ENGN,CODE 6090,WASHINGTON,DC 20375. INDIAN INST SCI,MOLEC BIOPHYS UNIT,BANGALORE 560012,KARNATAKA,INDIA. NR 12 TC 0 Z9 0 U1 0 U2 0 PU ADENINE PRESS INC PI GUILDERLAND PA PO BOX 355/340, GUILDERLAND, NY 12084 SN 0739-1102 J9 J BIOMOL STRUCT DYN JI J. Biomol. Struct. Dyn. PD AUG PY 1992 VL 10 IS 1 BP 239 EP 251 PG 13 WC Biochemistry & Molecular Biology; Biophysics SC Biochemistry & Molecular Biology; Biophysics GA JL899 UT WOS:A1992JL89900016 PM 1418744 ER PT J AU STRUGNELL, S MORIARTY, RM GILARDI, R KNUTSON, JC BISHOP, CW JONES, G AF STRUGNELL, S MORIARTY, RM GILARDI, R KNUTSON, JC BISHOP, CW JONES, G TI STEREOCHEMISTRY OF HUMAN LIVER CELL-DERIVED 1-ALPHA,24(OH)2D2 SO JOURNAL OF BONE AND MINERAL RESEARCH LA English DT Meeting Abstract C1 QUEENS UNIV,DEPT BIOCHEM,KINGSTON K7L 3N6,ONTARIO,CANADA. BONE CARE INT,MADISON,WI. USN,RES LAB,WASHINGTON,DC 20375. STEROIDS LTD,CHICAGO,IL. NR 0 TC 0 Z9 0 U1 0 U2 0 PU BLACKWELL SCIENCE INC PI MALDEN PA 350 MAIN ST, MALDEN, MA 02148 SN 0884-0431 J9 J BONE MINER RES JI J. Bone Miner. Res. PD AUG PY 1992 VL 7 SU 1 BP S161 EP S161 PG 1 WC Endocrinology & Metabolism SC Endocrinology & Metabolism GA JL595 UT WOS:A1992JL59500273 ER PT J AU WARD, KB ZUK, WM PEROZZO, MA WALKER, MA BIRNBAUM, GI KUNG, W CAVALIERE, A UFFEN, DR SCHOLAERT, H AF WARD, KB ZUK, WM PEROZZO, MA WALKER, MA BIRNBAUM, GI KUNG, W CAVALIERE, A UFFEN, DR SCHOLAERT, H TI DYNAMIC TELEROBOTIC CONTROL OF CRYSTALLIZATION EXPERIMENTS SO JOURNAL OF CRYSTAL GROWTH LA English DT Article; Proceedings Paper CT 4TH INTERNATIONAL SYMP ON CRYSTAL GROWTH OF BIOLOGICAL MACROMOLECULES - A FEBS ADVANCED LECTURE COURSE 1991 CY AUG 18-24, 1991 CL FRIEBURG, GERMANY AB A dynamically controlled system has been used to prepare crystals of lysozyme. The temperature of the crystallization chamber was adjusted based upon a scintillation signal used to detect the degree of nucleation and incipient crystal growth. Experiments conducted in one country were controlled and monitored by researchers in another, providing the first demonstration of telerobotic control of a protein crystallization experiment. C1 NATL RES COUNCIL CANADA,OTTAWA K1A 0R6,ONTARIO,CANADA. AASTRA AEROSP INC,TORONTO,ONTARIO,CANADA. RP WARD, KB (reprint author), USN,RES LAB,STRUCT MATTER LAB,CODE 6030,WASHINGTON,DC 20375, USA. NR 4 TC 8 Z9 9 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0022-0248 J9 J CRYST GROWTH JI J. Cryst. Growth PD AUG PY 1992 VL 122 IS 1-4 BP 235 EP 241 DI 10.1016/0022-0248(92)90251-D PG 7 WC Crystallography; Materials Science, Multidisciplinary; Physics, Applied SC Crystallography; Materials Science; Physics GA JP481 UT WOS:A1992JP48100034 ER PT J AU HANNICK, LI PEROZZO, MA SCHULTZ, LW WARD, KB AF HANNICK, LI PEROZZO, MA SCHULTZ, LW WARD, KB TI A PC-BASED SPREADSHEET FOR TRACKING RESULTS OF CRYSTALLIZATION EXPERIMENTS SO JOURNAL OF CRYSTAL GROWTH LA English DT Article; Proceedings Paper CT 4TH INTERNATIONAL SYMP ON CRYSTAL GROWTH OF BIOLOGICAL MACROMOLECULES - A FEBS ADVANCED LECTURE COURSE 1991 CY AUG 18-24, 1991 CL FRIEBURG, GERMANY AB Crystallization of proteins often involves many individual experiments entailing a great deal of recordkeeping. A method is used in our laboratory to track crystallization experiments with a commercially available spreadsheet program and an 80286 microprocessor-based personal computer (PC). The system takes advantage of a windowing environment. Results are entered directly into the spreadsheet as experiments are examined. The data are stored and later analyzed. They are sorted by pertinent fields and analyzed for significant trends. New experiments are then designed based upon these results. We have prepared crystals of several proteins, including the photoprotein aequorin, from the jellyfish Aequorea, in part by using information obtained from this tracking system. C1 GEOCENTERS INC,FT WASHINGTON,MD 20744. RP HANNICK, LI (reprint author), USN,RES LAB,CODE 6030,WASHINGTON,DC 20375, USA. NR 1 TC 2 Z9 2 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0022-0248 J9 J CRYST GROWTH JI J. Cryst. Growth PD AUG PY 1992 VL 122 IS 1-4 BP 303 EP 305 DI 10.1016/0022-0248(92)90260-P PG 3 WC Crystallography; Materials Science, Multidisciplinary; Physics, Applied SC Crystallography; Materials Science; Physics GA JP481 UT WOS:A1992JP48100043 ER PT J AU KARLE, JM KARLE, IL LEADER, H BREUER, E NEWMAN, AH GORDON, RK CHIANG, PK AF KARLE, JM KARLE, IL LEADER, H BREUER, E NEWMAN, AH GORDON, RK CHIANG, PK TI RELATIONSHIP OF THE CRYSTAL-STRUCTURE OF GAMMA-N,N-DIMETHYLAMINOPROPYL 2,2-DIPHENYLPROPIONATE HYDROCHLORIDE TO ANTIMUSCARINIC ACTIVITY SO JOURNAL OF CRYSTALLOGRAPHIC AND SPECTROSCOPIC RESEARCH LA English DT Article ID RECEPTORS; ANALOGS; BINDING AB The title compound was synthesized, characterized by H-1 nmr, and crystallized for x-ray crystallography. The antimuscarinic potency of the title compound was about equipotent to aprophen or atropine in inhibiting acetylcholine-induced contraction of guinea pig ileum (K(B) = 4.5 nM) and in inhibiting carbachol-stimulated release of alpha-amylase from rat pancreatic acinar cells (K(i) = 1.4 nM), and in inhibiting the binding of [N-methyl-H-3]scopolamine to cerebral cortex (K(i) = 6.6 nM). In the crystal, the O-C-C-C-N+ segment adopted a gauche-gauche configuration resulting in an N+ ... O (carbonyl) distance of 5.001(9) angstrom, a distance comparable to that in aprophen. The ether oxygen atom is buried rendering it inaccessible for interaction with the muscarinic receptor. The carbonyl oxygen atom is exposed to the surface of the molecule and is readily accessible for intermolecular interactions. The similarity in biological activities of the title compound and aprophen is congruous with their similar N+ ... O (carbonyl) distances. C1 USN,RES LAB,STRUCT MATTER LAB,WASHINGTON,DC 20375. WALTER REED ARMY MED CTR,DIV BIOCHEM,APPL BIOCHEM BRANCH,WASHINGTON,DC 20307. RP KARLE, JM (reprint author), WALTER REED ARMY MED CTR,DEPT PHARMACOL,DIV EXPTL THERAPEUT,WASHINGTON,DC 20307, USA. RI Breuer, Eli/E-8382-2011 NR 15 TC 0 Z9 0 U1 0 U2 1 PU PLENUM PUBL CORP PI NEW YORK PA 233 SPRING ST, NEW YORK, NY 10013 SN 0277-8068 J9 J CRYST SPECTROSC PD AUG PY 1992 VL 22 IS 4 BP 485 EP 491 DI 10.1007/BF01195411 PG 7 WC Crystallography; Spectroscopy SC Crystallography; Spectroscopy GA JR151 UT WOS:A1992JR15100015 ER PT J AU ABE, R ISHIDA, Y YUI, K KATSUMATA, M CHUSED, TM AF ABE, R ISHIDA, Y YUI, K KATSUMATA, M CHUSED, TM TI T-CELL RECEPTOR MEDIATED RECOGNITION OF SELF-LIGAND INDUCES SIGNALING IN IMMATURE THYMOCYTES BEFORE NEGATIVE SELECTION SO JOURNAL OF EXPERIMENTAL MEDICINE LA English DT Article ID ANTIGEN RECEPTOR; MONOCLONAL-ANTIBODIES; MLS DETERMINANTS; LYMPHOCYTES-T; TOLERANCE; GENE; EXPRESSION; ACTIVATION; MOLECULES; PRODUCTS AB Shaping of the T cell repertoire by selection during intrathymic maturation involves T cell receptor (TCR) recognition of major histocompatibility complex/self-antigen complexes. In this communication, we studied the ability of minor lymphocyte stimulating (Mls) determinants to act as self-tolerogens in the selection of the T cell repertoire. We demonstrate that unprimed T cells from normal as well as TCR transgenic mice form Mls-specific conjugates with antigen-presenting cells, and that this TCR-ligand interaction leads to elevation of intercellular Ca2+ ([Ca2+]i). Peripheral T cells from TCR transgenic mice expressing receptors specific for self-Mls antigen show no reactivities to Mls(a). However, a proportion of immature thymocytes from these mice show specific binding and strong [Ca2+]i elevation in response to self-antigen-presenting cells, although these thymocytes do not proliferate. This self-reactivity of thymocytes is inhibited by antibodies specific for TCR, CD4, CD8, class II molecules, lymphocyte function-associated antigen 1, and intercellular adhesion molecule 1. These results demonstrate for the first time that before thymic negative selection, immature T cells can specifically interact with cells bearing self-antigen, and suggest that the resulting TCR-dependent signal transduction events provide a basis for negative selection of self-reactive T cells. C1 NCI,EXPTL IMMUNOL BRANCH,BETHESDA,MD 20892. NIAID,IMMUNOL LAB,ROCKVILLE,MD 20852. UNIV PENN,DEPT PATHOL,PHILADELPHIA,PA 19104. UNIV PENN,MED LAB,PHILADELPHIA,PA 19104. RP ABE, R (reprint author), USN,MED RES INST,IMMUNE CELL BIOL PROGRAM,MAIL STOP 44,BETHESDA,MD 20899, USA. NR 34 TC 16 Z9 16 U1 0 U2 0 PU ROCKEFELLER UNIV PRESS PI NEW YORK PA 1114 FIRST AVE, 4TH FL, NEW YORK, NY 10021 SN 0022-1007 J9 J EXP MED JI J. Exp. Med. PD AUG 1 PY 1992 VL 176 IS 2 BP 459 EP 468 DI 10.1084/jem.176.2.459 PG 10 WC Immunology; Medicine, Research & Experimental SC Immunology; Research & Experimental Medicine GA JF803 UT WOS:A1992JF80300015 PM 1500856 ER PT J AU ROMANO, TA RIDGWAY, SH QUARANTA, V AF ROMANO, TA RIDGWAY, SH QUARANTA, V TI MHC CLASS-II MOLECULES AND IMMUNOGLOBULINS ON PERIPHERAL-BLOOD LYMPHOCYTES OF THE BOTTLE-NOSED-DOLPHIN, TURSIOPS-TRUNCATUS SO JOURNAL OF EXPERIMENTAL ZOOLOGY LA English DT Article ID IA-LIKE ANTIGENS; MONOCLONAL-ANTIBODIES; B-CELLS; POPULATIONS; PROTEINS; BOVINE; SWINE; PBL AB The immune system of marine mammals is of comparative interest because of its adaptation to the aquatic environment. Little information, however, is available on its cellular and molecular components. Here, we used a cross-reactive antibody to MHC class II molecules and an immunoglobulin-specific antiserum for identifying these molecular species on lymphocytes of the bottlenosed dolphin, Tursiops truncatus. Limited structural analyses indicated that class II molecules and immunoglobulins of dolphin closely resemble those of other vertebrates. In the peripheral blood of most land mammals both class II and immunoglobulins are usually found on B but not T lymphocytes. Expression of immunoglobulins on dolphin peripheral blood lymphocytes suggests a ratio of B cells to T cells comparable to that of land mammals. However, unlike the majority of land mammals, virtually 100% of the peripheral T cells display pronounced expression of class II molecules, generally considered an indication of T cell activation. It is therefore possible that the physiology of T cell activation has unusual attributes in the dolphin. It is especially interesting that some land mammals, namely swine (ungulates) and dogs and cats (carnivores), also express class II molecules on peripheral blood T lymphocytes. Since ungulates and carnivores are thought to share a common distant ancestry with toothed whales, the evolutionary history may be more relevant than the environmental history in determining these unusual attributes. C1 USN, CTR OCEAN SYST, SAN DIEGO, CA 92152 USA. Scripps Res Inst, RES INST, DEPT IMMUNOL IMM8, LA JOLLA, CA 92037 USA. RP ROMANO, TA (reprint author), UNIV ROCHESTER, SCH MED & DENT, DEPT NEUROBIOL & ANAT, BOX 603, 601 ELMWOOD AVE, ROCHESTER, NY 14642 USA. RI Quaranta, Vito/G-6512-2016 OI Quaranta, Vito/0000-0001-7491-8672 NR 31 TC 34 Z9 36 U1 0 U2 3 PU WILEY-LISS PI NEW YORK PA DIV JOHN WILEY & SONS INC 605 THIRD AVE, NEW YORK, NY 10158-0012 SN 0022-104X J9 J EXP ZOOL JI J. Exp. Zool. PD AUG 1 PY 1992 VL 263 IS 1 BP 96 EP 104 DI 10.1002/jez.1402630110 PG 9 WC Zoology SC Zoology GA JF660 UT WOS:A1992JF66000009 PM 1645122 ER PT J AU MITCHELL, HG GANGULI, SB PALMADESSO, PJ AF MITCHELL, HG GANGULI, SB PALMADESSO, PJ TI DIODE-LIKE RESPONSE OF HIGH-LATITUDE PLASMA IN MAGNETOSPHERE-IONOSPHERE COUPLING IN THE PRESENCE OF FIELD-ALIGNED CURRENTS SO JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS LA English DT Article ID POLAR WIND; LINE PLASMA; PARALLEL; DISTRIBUTIONS; MODEL AB The dynamic processes in the plasma along high-latitude field lines plays an important role in ionosphere-magnetosphere coupling process. We have created a time-dependent, large-scale simulation of these dynamics parallel to the geomagnetic field lines from the ionosphere well into the magnetosphere. The plasma consists of hot e- and H+ of magnetospheric origin and low-energy e-, H+, and O+ of ionospheric origin. Including multiple electron species, a major improvement to the model, has allowed us for the first time to simulate the upward current region properly and to dynamically simulate the diodelike response of the field-line plasma to the parallel currents coupling the ionosphere and magnetosphere. It is shown that return currents flow with small resistance, while upward currents produce kilovolt-sized potential drops along the field, as concluded from satellite observations. The kilovolt potential drops are due to the effect of the converging magnetic field on the high-energy magnetospheric electrons. C1 SCI APPLICAT INT CORP,DIV PLASMA PHYS,MCLEAN,VA 22102. USN,RES LAB,DIV PLASMA PHYS,WASHINGTON,DC 20375. RP MITCHELL, HG (reprint author), NASA,GODDARD SPACE FLIGHT CTR,DIV SPACE DATA & COMP,GREENBELT,MD 20771, USA. NR 16 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 1992 VL 97 IS A8 BP 12045 EP 12056 DI 10.1029/92JA00796 PG 12 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA JH648 UT WOS:A1992JH64800003 ER PT J AU HALL, JH CHIEN, JY KAUFFMAN, JM LITAK, PT ADAMS, JK HENRY, RA HOLLINS, RA AF HALL, JH CHIEN, JY KAUFFMAN, JM LITAK, PT ADAMS, JK HENRY, RA HOLLINS, RA TI SYNTHESES AND PHOTOPHYSICAL PROPERTIES OF SOME 5(2)-ARYL-2(5)-(4-PYRIDYL)OXAZOLES AND RELATED OXADIAZOLES AND FURANS SO JOURNAL OF HETEROCYCLIC CHEMISTRY LA English DT Article ID LASER-DYES AB A number of 5-aryl-2-(4-pyridyl)oxazoles, a 2-aryl-5-(4-pyridyl)oxazole, the related oxadiazole and furan, several 2-(4-pyridyl)cycloalkano[d]oxazoles, and many of their quaternary salts were prepared. No single standard synthesis was effective for preparation of more than a few of the 25 free bases described; methods often unique to a base were employed. Minor variations in structure sometimes produced large differences in absorption and emission wavelengths, as well as in the magnitude of the extinction coefficient. The salts are of interest as laser dyes, scintillation fluors, biological stains, and shifters for luminescent solar concentrators. C1 PHILADELPHIA COLL PHARM & SCI,DEPT CHEM,600 S 43RD ST,PHILADELPHIA,PA 19104. SO ILLINOIS UNIV,GRAD SCH,DEPT CHEM & BIOCHEM,CARBONDALE,IL 62901. USN,CTR WEAP,RES DEPT,DIV CHEM,CHINA LAKE,CA 93555. NR 44 TC 32 Z9 32 U1 0 U2 3 PU HETERO CORPORATION PI TAMPA PA BOX 20285, TAMPA, FL 33622-0285 SN 0022-152X J9 J HETEROCYCLIC CHEM JI J. Heterocycl. Chem. PD AUG-SEP PY 1992 VL 29 IS 5 BP 1245 EP 1273 PG 29 WC Chemistry, Organic SC Chemistry GA JR183 UT WOS:A1992JR18300034 ER PT J AU SEDEGAH, M SIM, BKL MASON, C NUTMAN, T MALIK, A ROBERTS, C JOHNSON, A OCHOLA, J KOECH, D WERE, B HOFFMAN, SL AF SEDEGAH, M SIM, BKL MASON, C NUTMAN, T MALIK, A ROBERTS, C JOHNSON, A OCHOLA, J KOECH, D WERE, B HOFFMAN, SL TI NATURALLY ACQUIRED CD8+ CYTOTOXIC LYMPHOCYTES-T AGAINST THE PLASMODIUM-FALCIPARUM CIRCUMSPOROZOITE PROTEIN SO JOURNAL OF IMMUNOLOGY LA English DT Article ID MALARIA SPOROZOITES; CS PROTEIN; CELLS; EPITOPE; ANTIBODIES; PROTECTION; RECOGNIZE; GAMMA; CD4+ AB In rodent malaria model systems, protective immunity induced by immunization with irradiated sporozoites is eliminated by in vivo depletion of CD8+ T cells, and adoptive transfer of CTL clones against the circumsporozoite protein protects against malaria. We recently demonstrated that volunteers immunized with irradiated Plasmodium falciparum sporozoites produce CTL against peptide 368-390 of the P.falciparum circumsporozoite protein. To determine whether natural exposure to malaria induced similar CTL, we studied 11 adult, male, life-long residents of a highly malarious area of Kenya, who were selected because their lymphocytes had been shown to proliferate after stimulation with peptides 361-380, 371-390, or 368-390 and because nine had been resistant to malaria in previous studies. In four of the 11 individuals there was peptide-specific, genetically restricted, CTL activity. In all four individuals, this activity was unaffected by depletion of CD4+ T cells. In three volunteers the activity was eliminated or reduced by depletion of CD8+ T cells; in the fourth volunteer the CD8+ T cell depletion was uninterpretable. This first demonstration of CD8+ T cell, genetically restricted, Ag-specific CTL against a malaria protein among individuals exposed to endemic malaria provides a foundation for studying the relationship between circulating CTL and resistance to malaria infection. C1 USN,MED RES INST,DEPT DEF,MALARIA VACCINE PROGRAM,BETHESDA,MD 20889. WALTER REED ARMY MED CTR,WASHINGTON,DC 20307. PAN AMER HLTH ORG,WASHINGTON,DC 20037. USA,MED RES UNIT KENYA,NEW YORK,NY 09675. GEORGETOWN UNIV,DEPT PEDIAT,WASHINGTON,DC 20007. KENYA GOVT MED RES CTR,NAIROBI,KENYA. NIH,PARASIT DIS LAB,BETHESDA,MD 20892. OI MASON, CARL/0000-0002-3676-2811 NR 23 TC 61 Z9 61 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 AUG 1 PY 1992 VL 149 IS 3 BP 966 EP 971 PG 6 WC Immunology SC Immunology GA JF474 UT WOS:A1992JF47400030 PM 1634778 ER PT J AU BASSILY, S STRICKLAND, GT ABDELWAHAB, MF ESMAT, GE NAROOZ, S ELMASRY, NA CONSTANTINE, NT STRUEWING, JP AF BASSILY, S STRICKLAND, GT ABDELWAHAB, MF ESMAT, GE NAROOZ, S ELMASRY, NA CONSTANTINE, NT STRUEWING, JP TI EFFICACY OF HEPATITIS-B VACCINATION IN PRIMARY-SCHOOL CHILDREN FROM A VILLAGE ENDEMIC FOR SCHISTOSOMA-MANSONI SO JOURNAL OF INFECTIOUS DISEASES LA English DT Article ID IMMUNE-RESPONSES; IMMUNOGENICITY; INFECTION; INFANTS; SAFETY; LONG AB To determine whether chronic Schistosoma mansoni infection interferes with hepatitis B virus (HBV) immunization, 308 schoolchildren aged 6-12 years with no evidence of prior HBV infection (156 with active schistosomiasis) were vaccinated with three 5-mu-g injections of recombinant DNA-derived HBV vaccine. The vaccine was given in the deltoid muscle at time 0 and 1 and 7 months later. All vaccinees were examined 1 and 3 years after vaccination for quantitative antibody to hepatitis B surface antigen (anti-HBs). Seroconversion was detected in 284 vaccinated children (92%), of whom 271 had a good (51-300 mIU/mL) or excellent (>300 mIU/mL) anti-HBs response. Sixteen other children (5%) had evidence of natural HBV infection (antibody to hepatitis B core antigen). Of those with good or excellent response, 99% retained high antibody titers for 3 years. Response was not influenced by S. mansoni infection. Hepatomegaly and splenomegaly were associated with reduced vaccine response. C1 UNIV CAIRO,FAC MED,DEPT TROP MED,CAIRO,EGYPT. UNIV MARYLAND,SCH MED,INT ALTH PROGRAM,BALTIMORE,MD 21201. UNIV MARYLAND,SCH MED,DEPT EPIDEMIOL & PREVENT MED,BALTIMORE,MD 21201. UNIV MARYLAND,SCH MED,DEPT PATHOL,BALTIMORE,MD 21201. UNIV MARYLAND,SCH MED,DEPT IMMUNOL & MICROBIOL,BALTIMORE,MD 21201. RP BASSILY, S (reprint author), USN,MED RES UNIT 3,PSC 452,BOX 5000,FPO,NEW YORK,NY 09835, USA. RI Struewing, Jeffery/C-3221-2008; Struewing, Jeffery/I-7502-2013 OI Struewing, Jeffery/0000-0002-4848-3334 NR 17 TC 8 Z9 8 U1 0 U2 0 PU UNIV CHICAGO PRESS PI CHICAGO PA 5720 S WOODLAWN AVE, CHICAGO, IL 60637 SN 0022-1899 J9 J INFECT DIS JI J. Infect. Dis. PD AUG PY 1992 VL 166 IS 2 BP 265 EP 268 PG 4 WC Immunology; Infectious Diseases; Microbiology SC Immunology; Infectious Diseases; Microbiology GA JE578 UT WOS:A1992JE57800006 PM 1386097 ER PT J AU MOLNAR, B CHI, P SIMONS, D AF MOLNAR, B CHI, P SIMONS, D TI SILICON CROSS DOPING AND ITS EFFECT ON THE SI OR BE IMPLANTATION DOPING OF GALLIUM-ARSENIDE GROWN ON (100) SILICON BY METALORGANIC CHEMICAL VAPOR-DEPOSITION SO JOURNAL OF MATERIALS RESEARCH LA English DT Article ID GAAS-ON-SI; MOLECULAR-BEAM EPITAXY; PHASE EPITAXY; INTERFACES; DIFFUSION AB A study of the cross doping of GaAs layers grown by a two-step metalorganic chemical vapor deposition on Si substrates is reported. All as-grown, unintentionally doped layers of GaAs were n-type, and the carrier profiles tracked the Si atomic profiles. Furnace annealing at 850-degrees-C for 30 min in an arsine overpressure, which is used to improve the crystalline quality of the GaAs near the heterointerface, caused additional Si to diffuse into the GaAs layer. Comparison of the Si concentration at the interface with the carrier concentration suggested the presence of compensating acceptors. Resonance Raman scattering by the Si(As) local vibrational mode near the interface shows that a fraction of the Si atoms are localized at the As sites. The furnace annealing increased the Si concentration in the 1.7-1.8-mu-m thick initially grown GaAs layer. This, in turn, influenced the electrical profiles created with Si or Be implantation on a 2.3-mu-m thick GaAs layer. C1 NATL INST STAND & TECHNOL,GAITHERSBURG,MD 20899. RP MOLNAR, B (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 32 TC 3 Z9 3 U1 0 U2 1 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 AUG PY 1992 VL 7 IS 8 BP 2186 EP 2193 DI 10.1557/JMR.1992.2186 PG 8 WC Materials Science, Multidisciplinary SC Materials Science GA JH823 UT WOS:A1992JH82300030 ER PT J AU HYAMS, KC MCCARTHY, MC KAUR, M PURDY, MA BRADLEY, DW MANSOUR, MM GRAY, S WATTS, DM CARL, M AF HYAMS, KC MCCARTHY, MC KAUR, M PURDY, MA BRADLEY, DW MANSOUR, MM GRAY, S WATTS, DM CARL, M TI ACUTE SPORADIC HEPATITIS-E IN CHILDREN LIVING IN CAIRO, EGYPT SO JOURNAL OF MEDICAL VIROLOGY LA English DT Article DE VIRAL HEPATITIS; ACUTE HEPATITIS; NON-A, NON-B HEPATITIS; HEPATITIS-E ID NON-B-HEPATITIS; EPIDEMIC NON-A; TRANSMITTED NON-A; VIRAL-HEPATITIS; VIRUS; ETIOLOGY; TRANSMISSION; OUTBREAK; ADULTS; WATER AB Seventy-three pediatric patients with acute hepatitis and 19 control patients without liver disease living in Cairo, Egypt, were evaluated with a newly developed Western blot assay for IgM antibody to hepatitis E virus (IgM anti-HEV). The mean age of acute hepatitis patients was 6.4 years (range, 1-13 years); 56% were male. Among the 73 acute cases, hepatitis A was diagnosed in 30 (41%), possible acute hepatitis B in three (4%), hepatitis E in nine (12%), and by exclusion, non-A, non-B hepatitis in 29 (40%). Two additional acute cases were positive for both IgM anti-HAV and IgM anti-HEV. None of the 19 control subjects had IgM anti-HEV. Parenteral risk factors were associated with cases of non-A, non-B hepatitis but were not associated with acute hepatitis E. Contact with a family member with jaundice was associated with acute hepatitis A. In contrast to prior epidemics of enterically-transmitted non-A, non-B hepatitis, HEV was found to be a common cause of acute hepatitis in a pediatric population. This study provides additional evidence that HEV may be a frequent cause of acute sporadic hepatitis among children living in some developing countries. C1 NATL NAVAL MED CTR, DEPT INTERNAL MED, BETHESDA, MD 20814 USA. USN, MED RES UNIT 3, CAIRO, EGYPT. CTR DIS CONTROL, HEPATITIS BRANCH, ATLANTA, GA 30333 USA. RP HYAMS, KC (reprint author), USN, MED RES INST, DIV EPIDEMIOL, 12300 WASHINGTON AVE, ROCKVILLE, MD 20852 USA. NR 19 TC 39 Z9 40 U1 0 U2 1 PU WILEY-LISS PI NEW YORK PA DIV JOHN WILEY & SONS INC 605 THIRD AVE, NEW YORK, NY 10158-0012 SN 0146-6615 J9 J MED VIROL JI J. Med. Virol. PD AUG PY 1992 VL 37 IS 4 BP 274 EP 277 DI 10.1002/jmv.1890370407 PG 4 WC Virology SC Virology GA JG922 UT WOS:A1992JG92200006 PM 1402826 ER PT J AU KWON, YW AF KWON, YW TI ANALYSIS OF COMPOSITE PLATES CONTAINING CRACKS SO JOURNAL OF PRESSURE VESSEL TECHNOLOGY-TRANSACTIONS OF THE ASME LA English DT Article ID FRACTURE AB Effect of microcracks, such as local matrix crack and fiber breakage, on a macroscale crack in a unidirectional composite plate was studied for various fiber volume fractions, as well as different material properties of fiber and matrix materials. A finite element analysis was performed for this study. It showed that microcracks, located near a macroscale crack tip, resulted in a significant increase of stress intensity factor at the crack tip. RP KWON, YW (reprint author), USN,POSTGRAD SCH,DEPT MECH ENGN,MONTEREY,CA 93943, USA. NR 11 TC 1 Z9 1 U1 0 U2 0 PU ASME-AMER SOC MECHANICAL ENG PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 SN 0094-9930 J9 J PRESS VESS-T ASME JI J. Press. Vessel Technol.-Trans. ASME PD AUG PY 1992 VL 114 IS 3 BP 358 EP 363 DI 10.1115/1.2929052 PG 6 WC Engineering, Mechanical SC Engineering GA JK889 UT WOS:A1992JK88900014 ER PT J AU LEUPOLD, RJ FLINTON, RJ PFEIFER, DL AF LEUPOLD, RJ FLINTON, RJ PFEIFER, DL TI COMPARISON OF VERTICAL MOVEMENT OCCURRING DURING LOADING OF DISTAL-EXTENSION REMOVABLE PARTIAL DENTURE BASES MADE BY 3 IMPRESSION TECHNIQUES SO JOURNAL OF PROSTHETIC DENTISTRY LA English DT Article AB Although the altered-cast impression technique attains stability and controlled tissue support for distal-extension removable partial dentures, the procedure is time-consuming and technique-sensitive. This study clinically compared the vertical displacement of distal-extension removable partial dentures made from different impression techniques. The impressions studied were the altered-cast impression, an impression made from a border-molded custom tray, and a stock tray irreversible hydrocolloid impression that served as a control. A post hoc analysis, using a Tukey Q-test, exhibited significance (p < 0.01) between the two impression techniques after intraoral loading was performed. Although statistically significant, the 0.19 mm difference between the impression techniques may or may not be clinically relevant. Additional research is required in this area. C1 WASHINGTON NAVY YARD,DENT CLIN,PROSTHODONT BRANCH,WASHINGTON,DC. USN,SCH DENT,DEPT PROSTHODONT,WASHINGTON,DC 20350. USN,SCH DENT,DIV REMOVABLE PARTIAL DENTURE,WASHINGTON,DC 20350. NR 5 TC 12 Z9 12 U1 0 U2 6 PU MOSBY-YEAR BOOK INC PI ST LOUIS PA 11830 WESTLINE INDUSTRIAL DR, ST LOUIS, MO 63146-3318 SN 0022-3913 J9 J PROSTHET DENT JI J. Prosthet. Dent. PD AUG PY 1992 VL 68 IS 2 BP 290 EP 293 DI 10.1016/0022-3913(92)90332-5 PG 4 WC Dentistry, Oral Surgery & Medicine SC Dentistry, Oral Surgery & Medicine GA JF662 UT WOS:A1992JF66200018 PM 1501177 ER PT J AU ANDREONE, A KRESIN, VZ WOLF, SA AF ANDREONE, A KRESIN, VZ WOLF, SA TI 2-GAP SUPERCONDUCTIVITY AND MICROWAVE PROPERTIES OF YBCO SO JOURNAL OF SUPERCONDUCTIVITY LA English DT Article DE YBA2CU3O7-X; CU-O2 PLANES; CU-O CHAINS; INDUCED SUPERCONDUCTIVITY; MICROWAVE LOSSES ID HIGH-TC SUPERCONDUCTORS; PARAMETERS AB The YBaCu3O7-x compound contains two conductive subsystem and as a result displays a two-gap structure. The Cu-O2 planes are characterized by intrinsic pairing, whereas the superconducting state of the Cu-O chains is induced by two different charge-transfer channels (intrinsic proximity effect and phonon-mediated transfer). Oxygen ordering affects the value of the induced energy gap. Such spectrum along with a short coherence length lead to peculiar microwave properties of YBCO thin films. The large residual microwave losses are explained in the framework of the two-gap model. C1 USN,RES LAB,WASHINGTON,DC 20375. UNIV NAPOLI FEDERICO 2,DIPARTIMENTO SCI FIS,I-80125 NAPLES,ITALY. RP ANDREONE, A (reprint author), LAWRENCE BERKELEY LAB,BERKELEY,CA 94720, USA. RI Wolf, Stuart/A-7513-2009 NR 17 TC 4 Z9 4 U1 0 U2 3 PU PLENUM PUBL CORP PI NEW YORK PA 233 SPRING ST, NEW YORK, NY 10013 SN 0896-1107 J9 J SUPERCOND JI J. Supercond. PD AUG PY 1992 VL 5 IS 4 BP 339 EP 344 DI 10.1007/BF00618133 PG 6 WC Physics, Applied; Physics, Condensed Matter SC Physics GA JW931 UT WOS:A1992JW93100004 ER PT J AU BORGIOTTI, GV ROSEN, EM AF BORGIOTTI, GV ROSEN, EM TI THE DETERMINATION OF THE FAR FIELD OF AN ACOUSTIC RADIATOR FROM SPARSE MEASUREMENT SAMPLES IN THE NEAR-FIELD SO JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA LA English DT Article ID SUPERPOSITION; HOLOGRAPHY AB The near-field to far-field projection procedure here introduced has the following novel features. (1) The measured near-field samples do not need to belong to a separable coordinate surface. (2) The number of samples is, in principle, as small as the theoretical number of degrees of freedom of the far field, related to the dimensions of the source in wavelengths. (3) The samples do not need to belong to a regular grid. (4) If the projection is sought only within a limited angular sector, a further reduction of the number of measurement samples is possible. The technique is based on the identification from the measured data of an equivalent monopolar distribution of acoustic sources on a surface completely surrounding the radiator. The far field of these sources, straightforwardly computed, constitutes the estimate of the far field of the radiator. The identification is based on the pseudo inversion of the matrix representing the mapping of the equivalent sources into near-field samples, which is obtained by resorting to the singular value decomposition of the matrix. Representative results of the extensive numerical simulations are here included. C1 USN,RES LAB,WASHINGTON,DC 20375. SFA INC,LANDOVER,MD 20785. RP BORGIOTTI, GV (reprint author), GEORGE WASHINGTON UNIV,DEPT ELECT ENGN & COMP SCI,WASHINGTON,DC 20052, USA. NR 13 TC 14 Z9 14 U1 0 U2 1 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0001-4966 J9 J ACOUST SOC AM JI J. Acoust. Soc. Am. PD AUG PY 1992 VL 92 IS 2 BP 807 EP 818 DI 10.1121/1.403951 PN 1 PG 12 WC Acoustics; Audiology & Speech-Language Pathology SC Acoustics; Audiology & Speech-Language Pathology GA JG992 UT WOS:A1992JG99200019 ER PT J AU SARKISSIAN, A AF SARKISSIAN, A TI RECONSTRUCTION OF THE SURFACE ACOUSTIC FIELD ON RADIATING STRUCTURES SO JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA LA English DT Article ID INTEGRAL-EQUATION; HOLOGRAPHY AB An algorithm is developed for the reconstruction of the surface acoustic field from measurements of pressure made in the far field for a structure with arbitrary geometry. The boundary-element method is applied. The presence of the evanescent-like field is treated by expanding surface normal velocity in a set of functions that form the eigenstates of radiated power, computed by diagonalizing the surface resistance operator. The result of the reconstruction is the observable part of the surface normal velocity that generates the far-field radiation and does not include the evanescent-like field that decays very rapidly away from the surface. The algorithm is tested by applying it to scattering from a rigid cylinder with hemispherical endcaps. It is also applied to the radiation problem of a small piston located on the same cylinder, where the resolution attained on the surface for this ill-posed problem is shown to increase with increasing frequency. RP SARKISSIAN, A (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 8 TC 11 Z9 16 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 AUG PY 1992 VL 92 IS 2 BP 825 EP 830 DI 10.1121/1.403953 PN 1 PG 6 WC Acoustics; Audiology & Speech-Language Pathology SC Acoustics; Audiology & Speech-Language Pathology GA JG992 UT WOS:A1992JG99200021 ER PT J AU JACKSON, DR BRIGGS, KB AF JACKSON, DR BRIGGS, KB TI HIGH-FREQUENCY BOTTOM BACKSCATTERING - ROUGHNESS VERSUS SEDIMENT VOLUME SCATTERING SO JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA LA English DT Article ID SHALLOW-WATER; ACOUSTIC BACKSCATTERING; MARINE-SEDIMENTS; OCEAN BOTTOM; SEA-SURFACE; MODEL AB High-frequency bottom acoustic and geoacoustic data from three well-characterized sites of different bottom composition are compared with scattering models in order to clarify the roles played by interface roughness and sediment volume inhomogeneities. Model fits to backscattering data from two silty sites lead to the conclusion that scattering from volume inhomogeneities was primarily responsible for the observed backscattering. In contrast, measured bottom roughness was sufficient to explain the backscattering seen at a sandy site. Although the sandy site had directional ripples, the model and data agree in their lack of anisotropy. C1 NAVAL RES LAB,DIV SEAFLOOR GEOSCI,BAY ST LOUIS,MS 39529. RP JACKSON, DR (reprint author), UNIV WASHINGTON,COLL OCEAN & FISHERY SCI,APPL PHYS LAB,SEATTLE,WA 98105, USA. OI Jackson, Darrell/0000-0001-8060-2439 NR 35 TC 120 Z9 125 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 1992 VL 92 IS 2 BP 962 EP 977 DI 10.1121/1.403966 PN 1 PG 16 WC Acoustics; Audiology & Speech-Language Pathology SC Acoustics; Audiology & Speech-Language Pathology GA JG992 UT WOS:A1992JG99200035 ER PT J AU NYSTUEN, JA OSTWALD, LH MEDWIN, H AF NYSTUEN, JA OSTWALD, LH MEDWIN, H TI THE HYDROACOUSTICS OF A RAINDROP IMPACT SO JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA LA English DT Article ID SOUND; RAINFALL AB Raindrops produce sound underwater by two known mechanisms: a relatively low energy impact sound and a much stronger bubble sound when a bubble in trapped during the drop splash. Although the bubble sound dominates when it occurs, in other circumstances the impact sound is important. The impact sound has been studied in the laboratory using single drops falling at terminal velocity and with numerical simulation. In both instances, it is convenient to monitor the pressure field in the immediate vicinity of the drop impact. This "near-field" pressure contains acoustic and nonacoustic components. The acoustic components include an impulsive acoustic water hammer and internal resonances of the water drop itself. The nonacoustic component of the pressure field is part of the hydrodynamic establishment of the splash flow and should not be interpreted as acoustic energy. The two components have been separated in order to identify the far-field acoustic propagation. C1 NAVAL POST GRAD SCH,DEPT PHYS,MONTEREY,CA 93943. RP NYSTUEN, JA (reprint author), NAVAL POST GRAD SCH,DEPT OCEANOG,MONTEREY,CA 93943, USA. NR 17 TC 7 Z9 7 U1 0 U2 6 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0001-4966 J9 J ACOUST SOC AM JI J. Acoust. Soc. Am. PD AUG PY 1992 VL 92 IS 2 BP 1017 EP 1021 DI 10.1121/1.404030 PN 1 PG 5 WC Acoustics; Audiology & Speech-Language Pathology SC Acoustics; Audiology & Speech-Language Pathology GA JG992 UT WOS:A1992JG99200041 ER PT J AU NAZERI, A KAHN, M AF NAZERI, A KAHN, M TI PREPARATION OF KTAO3 AND KNBO3 SOLID-SOLUTIONS THROUGH SOL-GEL PROCESSING SO JOURNAL OF THE AMERICAN CERAMIC SOCIETY LA English DT Article ID THIN-FILMS AB Potassium tantalate-niobate solid-solution (KTN) powders and thin films were prepared from metallo-organic compounds through sol-gel processing. The KTN precursors were chemically modified and then prehydrolyzed with various concentrations of water. The stability of the modified solutions and the effects of prehydrolysis on the crystallization are discussed. Powder gels were obtained by exposing the solution to the atmospheric water, hydrolyzing the solutions. Alternatively, thin films were deposited on fused silica, silicon, sapphire, MgO, and SrTiO3, using the spinning technique. The pyrolysis and crystallization of KTN powders and films were investigated by differential thermal analysis, thermogravimetric analysis, and X-ray diffraction. The effects of substrate and other processing parameters on the crystal structure of the KTN phases were also investigated. KTN powders crystallized into a perovskite phase regardless of the processing conditions. The crystal structure of the KTN thin films had a strong dependency on the crystal structure of the substrates, while other processing parameters played smaller roles. Pyrochlore KTN was the major phase that crystallized on fused silica and silicon, whereas oriented perovskite KTN was obtained on single-crystal MgO and SrTiO3. RP NAZERI, A (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 17 TC 28 Z9 28 U1 2 U2 9 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 AUG PY 1992 VL 75 IS 8 BP 2125 EP 2133 DI 10.1111/j.1151-2916.1992.tb04474.x PG 9 WC Materials Science, Ceramics SC Materials Science GA JH474 UT WOS:A1992JH47400014 ER PT J AU JESSEN, TL LEWIS, D AF JESSEN, TL LEWIS, D TI LIMITING SUBCRITICAL CRACK-GROWTH IN GLASS-MATRIX COMPOSITES SO JOURNAL OF THE AMERICAN CERAMIC SOCIETY LA English DT Article ID STRESS-CORROSION; FRACTURE; TOUGHNESS; CERAMICS; FATIGUE AB Subcritical crack growth measurements were made in borosilicate glass/Fe-Ni-Co particulate composites, in which the metal particles were used both as-received and also with a surface oxidation treatment. No crack growth was observed in the composites containing the partially oxidized particles before catastrophic failure ensued. The composites containing nonoxidized particles did exhibit measurable growth. Fracture surface observations identify strong bonding between the particles and matrix as the main reason for significantly increasing the slow crack growth resistance. This method of "effectively" eliminating subcritical crack growth may be a means by which the design threshold of glasses is raised, thus opening new areas of applications for glass systems. RP JESSEN, TL (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 20 TC 0 Z9 0 U1 0 U2 1 PU AMER CERAMIC SOC PI WESTERVILLE PA 735 CERAMIC PLACE, PO BOX 6136, WESTERVILLE, OH 43081-6136 SN 0002-7820 J9 J AM CERAM SOC JI J. Am. Ceram. Soc. PD AUG PY 1992 VL 75 IS 8 BP 2219 EP 2224 DI 10.1111/j.1151-2916.1992.tb04487.x PG 6 WC Materials Science, Ceramics SC Materials Science GA JH474 UT WOS:A1992JH47400027 ER PT J AU SI, C LLOYD, IK KAHN, M AF SI, C LLOYD, IK KAHN, M TI MODIFICATION OF SURFACE TEXTURE BY GRINDING AND POLISHING LEAD ZIRCONATE TITANATE CERAMICS SO JOURNAL OF THE AMERICAN CERAMIC SOCIETY LA English DT Article AB Grinding and polishing affected the orientation of 90-degrees domains at the surface of lead zirconate titanate (PZT) ceramics. This was quantified by using changes in the intensity ratio of the {002} and {200} X-ray reflections. Grinding unpoled PZT with 600-grit SiC paper gave X-ray intensity ratios similar to those of poled material. This implies that 90-degrees domain realignments had occurred in the near surface region probed by the X-rays. Grinding poled samples with 600-grit SiC further increased the X-ray intensity ratio beyond that caused by poling, indicating that additional surface reorientation of 90-degrees domains had occurred. The effects of diamond polishing depended on the size of the diamond particles. The use of 6-mu-m diamond had no effect on the {002}/{200} intensity ratio of either poled or unpoled samples, while polishing with 15- or 45-mu-m diamond significantly enhanced the 90-degrees domain rotation. In unpoled samples, the increase in the X-ray intensity ratio then approached that induced by poling or grinding with 600-grit SiC paper. While the observed increase in X-ray intensity ratio upon grinding is attributed to the rotation of 90-degrees domains, the simultaneous formation of 180-degrees domains appears to minimize or reduce the increase in electrical polarization. C1 USN,RES LAB,WASHINGTON,DC 20375. RP SI, C (reprint author), UNIV MARYLAND,ENGN MAT PROGRAM,COLL PK,MD 20742, USA. RI Lloyd, Isabel/B-1513-2012 NR 16 TC 2 Z9 2 U1 0 U2 0 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 AUG PY 1992 VL 75 IS 8 BP 2293 EP 2296 PG 4 WC Materials Science, Ceramics SC Materials Science GA JH474 UT WOS:A1992JH47400039 ER PT J AU SABRY, M AF SABRY, M TI CRITICAL ANALYSIS OF AN EPIDEMETRONS MODEL FOR THE ASSESSMENT OF BANCROFTIAN FILARIASIS ENDEMICITY IN SOME AREAS IN EGYPT SO JOURNAL OF TROPICAL MEDICINE AND HYGIENE LA English DT Article AB This study attempted a trial fit of observed epidemiological data in Egypt using the Sasa-WHO-Southgate epidemetrons model to quantify the endemicity and risk of transmission of filariasis. The geometric and arithmetic means (GM, AM) were tried in addition to the recommended four epidemetrons of the model, prevalence rate (PR); median microfilaria density (MfD50); and linear regression coefficients (a and b). Data were based on microfilaria counts in 20 mm3 finger-prick night blood samples from all individuals 6 years of age and older of both sexes in a cluster of eight filaria-endemic villages. The study results showed that the model fits satisfactorily in each individual village but major discrepancies occurred when comparisons were made between the villages. PR was closely but by no means perfectly correlated with MfD50, was more closely correlated with GM but less with AM, and showed a rather weak negative correlation with each of a and b by linear regression and by rank order. A possible explanation for these discrepancies is that in areas of recent importation or increase of transmission of filariasis and in areas of great population mobility, observed microfilaria prevalences and microfilaria intensities will not conform to the PR, MfD50, a and b epidemetrons recommended by Sasa (1967), WHO (1967) and Southgate (1974) as descriptive epidemetrons of microfilaraemia. Further studies are warranted. RP SABRY, M (reprint author), USN,MED RES UNIT 3,PSC 452,BOX 5000,CAIRO,EGYPT. NR 13 TC 3 Z9 4 U1 0 U2 0 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 AUG PY 1992 VL 95 IS 4 BP 260 EP 265 PG 6 WC Public, Environmental & Occupational Health; Tropical Medicine SC Public, Environmental & Occupational Health; Tropical Medicine GA JJ069 UT WOS:A1992JJ06900005 PM 1495122 ER PT J AU NETA, B AF NETA, B TI ANALYSIS OF FINITE-ELEMENTS AND FINITE-DIFFERENCES FOR SHALLOW-WATER EQUATIONS - A REVIEW SO MATHEMATICS AND COMPUTERS IN SIMULATION LA English DT Review ID LAGRANGIAN INTEGRATION SCHEMES; GEOSTROPHIC ADJUSTMENT; PRIMITIVE EQUATIONS; MODELS AB In this review article we discuss analyses of finite-element and finite-difference approximations of the shallow water equations. An extensive bibliography is given. C1 USN,POSTGRAD SCH,DEPT MATH,MONTEREY,CA 93943. RI Neta, Beny/B-1737-2009 NR 71 TC 2 Z9 2 U1 3 U2 3 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0378-4754 J9 MATH COMPUT SIMULAT JI Math. Comput. Simul. PD AUG PY 1992 VL 34 IS 2 BP 141 EP 161 DI 10.1016/0378-4754(92)90050-Q PG 21 WC Computer Science, Interdisciplinary Applications; Computer Science, Software Engineering; Mathematics, Applied SC Computer Science; Mathematics GA JK905 UT WOS:A1992JK90500004 ER PT J AU CLARK, JB GARRETT, RK JUNGLING, TL ASFAHANI, RI AF CLARK, JB GARRETT, RK JUNGLING, TL ASFAHANI, RI TI INFLUENCE OF TRANSVERSE ROLLING ON THE MICROSTRUCTURAL AND TEXTURE DEVELOPMENT IN PURE TANTALUM SO METALLURGICAL TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE LA English DT Article ID INITIAL INGOT BREAKDOWN; HIGH-PURITY TANTALUM; DEEP DRAWING STEELS; PROCESSING VARIABLES; ODF-ANALYSIS; GRADIENTS AB The influence of transverse rolling passes on the recrystallization texture was investigated in an effort to strengthen the {111} [uvw] type components and reduce the intensity of the {100} [0vw] components, improve the uniformity of the microstructure, and refine the grain size in high-purity tantalum plate. Tantalum, from three different ingot breakdown processes, received an additional 80 pct reduction in the transverse direction (perpendicular to the ingot centerline) in the processing schedule prior to final annealing. This work investigated the influence of the additional transverse rolling passes on the development of texture in the as-rolled tantalum and also in rolled plus annealed tantalum. After annealing, the tantalum plates had significantly strengthened {111} [uvw] crystallographic orientations, not only for the side forged process, but also for the upset and side forged tantalum. For tantalum processed by extrusion, the transverse rolling did not improve the final recrystallized texture. C1 WESTINGHOUSE PLANT APPARATUS DIV,MONROEVILLE,PA 15146. US STEEL TECH CTR,MONROEVILLE,PA 15146. RP CLARK, JB (reprint author), USN,CTR SURFACE WARFARE,SILVER SPRING,MD 20903, USA. NR 12 TC 33 Z9 36 U1 0 U2 2 PU MINERALS METALS MATERIALS SOC PI WARRENDALE PA 420 COMMONWEALTH DR, WARRENDALE, PA 15086 SN 0360-2133 J9 METALL TRANS A PD AUG PY 1992 VL 23 IS 8 BP 2183 EP 2191 DI 10.1007/BF02646011 PG 9 WC Materials Science, Multidisciplinary SC Materials Science GA JG400 UT WOS:A1992JG40000011 ER PT J AU LEE, EU AF LEE, EU TI THERMAL-STRESS AND STRAIN IN A METAL MATRIX COMPOSITE WITH A SPHERICAL REINFORCEMENT PARTICLE SO METALLURGICAL TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE LA English DT Article ID PLASTIC RELAXATION; RESIDUAL-STRESSES; THERMOMECHANICAL LOADINGS; CYLINDERS; BEHAVIOR; FIELD AB The stresses and strains, induced by coefficient of thermal expansion (CTE) mismatch, are analyzed for a metal matrix composite (MMC) with a spherical reinforcement particle. The spherical reinforcement particle is found to be in a hydrostatic stress state and remains in the elastic state. The stresses and strains are largest, and plastic deformation occurs in the matrix adjacent to the reinforcement particle. Accordingly, the reinforcement particle/matrix interface becomes a potential crack initiation site under thermal cycling. The critical internal pressure for plastic deformation is less than two-thirds of the yield stress of the matrix material and decreases with increasing range of thermal cycle. RP LEE, EU (reprint author), USN,DIV AIRCRAFT,WARMINSTER,PA 18974, USA. NR 38 TC 26 Z9 29 U1 1 U2 7 PU MINERALS METALS MATERIALS SOC PI WARRENDALE PA 420 COMMONWEALTH DR, WARRENDALE, PA 15086 SN 0360-2133 J9 METALL TRANS A PD AUG PY 1992 VL 23 IS 8 BP 2205 EP 2210 DI 10.1007/BF02646013 PG 6 WC Materials Science, Multidisciplinary SC Materials Science GA JG400 UT WOS:A1992JG40000013 ER PT J AU TAIT, GB AF TAIT, GB TI ALLOY RAMP HETEROSTRUCTURE DIODES FOR MICROWAVE MIXER APPLICATIONS SO MICROWAVE AND OPTICAL TECHNOLOGY LETTERS LA English DT Article DE MIXER; HETEROSTRUCTURE; DETECTOR AB Simulated and experimental data on mixer performance of semiconductor alloy ramp heterostructure diodes are presented. The results indicate that these devices are excellent candidates for use in microwave and millimeter-wave mixer circuits. In addition, they possess several significant advantages over contending Schottky barrier diodes, the microwave industry workhorse for mixers and detectors. RP TAIT, GB (reprint author), USN,RES LAB,DIV ELECTR SCI & TECHNOL,WASHINGTON,DC 20375, 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 0895-2477 J9 MICROW OPT TECHN LET JI Microw. Opt. Technol. Lett. PD AUG PY 1992 VL 5 IS 9 BP 417 EP 420 DI 10.1002/mop.4650050906 PG 4 WC Engineering, Electrical & Electronic; Optics SC Engineering; Optics GA JA600 UT WOS:A1992JA60000005 ER PT J AU CADE, TA AF CADE, TA TI PARESTHESIA OF THE INFERIOR ALVEOLAR NERVE FOLLOWING THE EXTRACTION OF THE MANDIBULAR 3RD MOLARS - A LITERATURE-REVIEW OF ITS CAUSES, TREATMENT, AND PROGNOSIS SO MILITARY MEDICINE LA English DT Article AB Mandibular paresthesia is an unfortunate complication after the extraction of mandibular third molars. Damage to the inferior alveolar nerve may occur via direct or indirect injury. Careful evaluation of pre-operative panoramic radiographs with regard to root configuration and intimacy to the mandibular canal are most important. Various surgical techniques may be dictated by the radiographic presentation. When paresthesia does occur, a simple yet thorough mechanism for documentation is required. This article reviews paresthesia of the inferior alveolar nerve as a result of the extraction of the mandibular third molars. RP CADE, TA (reprint author), USN,CTR DENT,DEPT ORAL SURG,NEWPORT,RI, USA. NR 0 TC 12 Z9 12 U1 0 U2 0 PU ASSN MILITARY SURG US PI BETHESDA PA 9320 OLD GEORGETOWN RD, BETHESDA, MD 20814 SN 0026-4075 J9 MIL MED JI Milit. Med. PD AUG PY 1992 VL 157 IS 8 BP 389 EP 392 PG 4 WC Medicine, General & Internal SC General & Internal Medicine GA JJ502 UT WOS:A1992JJ50200009 PM 1528481 ER PT J AU MYLER, HR WEEKS, AR GILLIS, RK HALL, GW AF MYLER, HR WEEKS, AR GILLIS, RK HALL, GW TI OBJECT-ORIENTED NEURAL SIMULATION TOOLS FOR A HYPERCUBE PARALLEL MACHINE SO NEUROCOMPUTING LA English DT Article DE ARTIFICIAL NEURAL NETWORK (ANN); OBJECT-ORIENTED PROGRAMMING (OOP); PARALLEL PROCESSING; COMPUTER AIDED SOFTWARE ENGINEERING (CASE) AB A substantial amount of work has recently been completed at the University of Central Florida in the development of an Artificial Neural Network (ANN) simulation environment that overcomes traditional implementation problems normally associated with these types of programs. Researchers addressing the development and application of ANN systems seek modifiability, expansibility and platform independence. Our system allows for these elements as well as parallel execution when a parallel hardware is available. This is accomplished by use of object-oriented programming and a Computer Aided Software Engineering (CASE) approach to the development environment that allows the user to modify the software describing the ANN model without understanding of the overall implementation details. A sophisticated Graphical User Interface (GUI) is provided to allow rapid construction and evaluation of complex large-scale neural models. C1 UNIV CENT FLORIDA,DEPT COMP ENGN,ORLANDO,FL 32816. HARRIS CORP,DIV SPACE SYST,ROCKLEDGE,FL 32955. USN,CTR TRAINING SYST,ORLANDO,FL 32826. 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 0925-2312 J9 NEUROCOMPUTING JI Neurocomputing PD AUG PY 1992 VL 4 IS 5 BP 235 EP 248 DI 10.1016/0925-2312(92)90029-O PG 14 WC Computer Science, Artificial Intelligence SC Computer Science GA JV689 UT WOS:A1992JV68900002 ER PT J AU ADLER, CL LAWANDY, NM AF ADLER, CL LAWANDY, NM TI OPTICAL GRADIENT FORCES ON COLLOIDAL CRYSTALS - GENERATION OF SPATIALLY COMPLEX STRUCTURES SO OPTICS COMMUNICATIONS LA English DT Article ID FRENKEL-KONTOROVA MODEL; DYNAMICS AB We show that the gradient force due to counterpropagating light beams can be used to create an experimentally realizable three-dimensional analog of the one-dimensional Frenkel-Kontorova model. C1 BROWN UNIV,DIV ENGN,PROVIDENCE,RI 02912. BROWN UNIV,DEPT PHYS,PROVIDENCE,RI 02912. RP ADLER, CL (reprint author), USN,RES LAB,LASER PHYS BRANCH,WASHINGTON,DC 20375, USA. NR 22 TC 4 Z9 4 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0030-4018 J9 OPT COMMUN JI Opt. Commun. PD AUG 1 PY 1992 VL 91 IS 5-6 BP 354 EP 359 DI 10.1016/0030-4018(92)90359-Y PG 6 WC Optics SC Optics GA JF874 UT WOS:A1992JF87400007 ER PT J AU LEE, KE HIGA, KT NISSAN, RA BUTCHER, RJ AF LEE, KE HIGA, KT NISSAN, RA BUTCHER, RJ TI SYNTHESIS, CHARACTERIZATION, AND STRUCTURE OF ACETYLENIC GALLIUM DIALKYLPHOSPHIDES HAVING THE FORMULA [(T-BU)(ME3SICC)GAPR2]2 (R=ET,I-PR,T-BU) SO ORGANOMETALLICS LA English DT Article ID GAP; SEMICONDUCTORS; SPECTROSCOPY; DERIVATIVES; PHOSPHORUS; PRECURSORS; COMPLEXES; CRYSTAL AB Reactions of the gallium acetylide [(t-BU)2GaC=CSiMe3]2 and 2 equiv of the phosphines R2PH (R = Et, i-Pr, t-Bu) in toluene at 140-degrees-C give the acetylenic gallium dialkylphosphide dimers [(t-Bu)-(Me3SiC=C)GaPR2]2 (61-81 %) as cis and trans isomers. Single-crystal X-ray analysis of colorless cubes obtained from a cold hexane solution of cis- and trans-[(t-Bu)(Me3SiC=C)GaPEt2]2 shows the crystals to be trans-[(t-Bu)(Me3SiC=C)GaPEt2]2 (monoclinic, P2(1)/n (No. 14); a = 10.023 (6) angstrom, b = 16.271 (9) angstrom, c = 12.292 (8) angstrom, beta = 113.91 (5)-degrees, V = 1833 (2) angstrom3, Z = 4). Dimer formation occurs via Ga-P bonding in a planar Ga2P2 ring. The (C{H})-C-13-H-1 and C-13 NMR spectra of these dimers also give evidence for a gallium-phosphorus bridge. C1 HOWARD UNIV,DEPT CHEM,WASHINGTON,DC 20059. RP LEE, KE (reprint author), USN,CTR AIR WARFARE,DEPT RES,DIV CHEM,CHINA LAKE,CA 93555, USA. NR 32 TC 11 Z9 11 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0276-7333 J9 ORGANOMETALLICS JI Organometallics PD AUG PY 1992 VL 11 IS 8 BP 2816 EP 2821 DI 10.1021/om00044a021 PG 6 WC Chemistry, Inorganic & Nuclear; Chemistry, Organic SC Chemistry GA JH677 UT WOS:A1992JH67700021 ER PT J AU WOODRUFF, SI CONWAY, TL AF WOODRUFF, SI CONWAY, TL TI A LONGITUDINAL ASSESSMENT OF THE IMPACT OF HEALTH FITNESS STATUS AND HEALTH BEHAVIOR ON PERCEIVED QUALITY-OF-LIFE SO PERCEPTUAL AND MOTOR SKILLS LA English DT Article ID DEPRESSION; ILLNESS AB This Study extended cross-sectional research associating quality of life with health and fitness factors. Longitudinal analyses were performed on data collected from 519 U.S. Navy personnel to assess changes in quality of life with changes in health/fitness status and health behavior dimensions at 1-yr. and 2-yr. intervals. Multiple regression results showed that such changes were positively associated with changes in health/fitness status and behaviors related to accident control and wellness maintenance, with these predictors accounting for 8% of the variance in change in quality of life at the 1-yr. interval. At the 2-yr. interval, such change was associated with health/fitness status and accident control behaviors, accounting for 11% of the variance. Health behavior change made a unique contribution to change in quality of life after controlling for changes in health/fitness status at both intervals. Findings affirm modest yet consistent associations between changes in fitness and health variables and quality of life and suggest that improvements in health behavior influence quality of life independently of one's health/fitness status. RP WOODRUFF, SI (reprint author), USN,HLTH RES CTR,DEPT HLTH SCI & EPIDEMIOL,POB 85122,SAN DIEGO,CA 92186, USA. NR 24 TC 4 Z9 4 U1 1 U2 1 PU PERCEPTUAL MOTOR SKILLS PI MISSOULA PA PO BOX 9229, MISSOULA, MT 59807 SN 0031-5125 J9 PERCEPT MOTOR SKILL JI Percept. Mot. Skills PD AUG PY 1992 VL 75 IS 1 BP 3 EP 14 PG 12 WC Psychology, Experimental SC Psychology GA JJ830 UT WOS:A1992JJ83000001 PM 1528685 ER PT J AU CARLOS, WE KAPLAN, R LOWNDES, DH NORTON, DP AF CARLOS, WE KAPLAN, R LOWNDES, DH NORTON, DP TI MICROWAVE PROPERTIES OF YBA2CU3O7-DELTA/PRBA2CU3O7-DELTA SUPERLATTICES SO PHYSICA C LA English DT Article ID HIGH-TC SUPERCONDUCTORS; SINGLE-CRYSTALS; THIN-FILMS AB We have used non-resonant microwave absorption to study c-axis YBa2Cu3O7-delta/PrBa2Cu3O7-delta superlattices and compare the response to a film of similarly grown YBa2Cu3O7-delta (YBCO). Near the respective transition temperatures, the response of the superlattice samples and the YBCO film have similar amplitudes and orientation dependences. This is consistent with the microwave loss being related to magnetic flux penetration at (110) slip planes. At lower temperatures, the response of the superlattices is much stronger than that of the YBCO film and, while both responses are hysteretic at low temperatures, the widths of the hysteresis have opposite orientation dependences, which we attribute to the role of the PrBa2Cu3O7-delta layers. C1 OAK RIDGE NATL LAB,DIV SOLID STATE,OAK RIDGE,TN 37831. RP CARLOS, WE (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 11 TC 0 Z9 0 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 1992 VL 198 IS 3-4 BP 247 EP 255 DI 10.1016/0921-4534(92)90198-L PG 9 WC Physics, Applied SC Physics GA JF994 UT WOS:A1992JF99400007 ER PT J AU KRESIN, VZ WOLF, SA AF KRESIN, VZ WOLF, SA TI INDUCED SUPERCONDUCTIVITY AND GAPLESS STATE IN YBA2CU3O7-X SO PHYSICA C LA English DT Article ID ENERGY-GAP; PARAMETERS; CRYSTAL AB The removal of oxygen from YBa2Cu3O7-x has a profound impact on various properties of this compound. The model of induced two gap superconductivity that we developed previously allows us to describe these properties. For example, for compositions between 0 l2(A) invites an extension of fractals. That is, when \A\ infinite, Baire's Space N(A) is a "generalized code space" on \A\ symbols that addresses the points of the "generalized fractal" L(A). C1 USN,CTR SURFACE WARFARE,DEPT STRATEG SYST,DAHLGREN,VA 22448. RP LIPSCOMB, SL (reprint author), MARY WASHINGTON COLL,DEPT MATH,FREDERICKSBURG,VA 22401, USA. NR 16 TC 30 Z9 30 U1 0 U2 0 PU AMER MATHEMATICAL SOC PI PROVIDENCE PA 201 CHARLES ST, PROVIDENCE, RI 02940-2213 SN 0002-9939 J9 P AM MATH SOC JI Proc. Amer. Math. Soc. PD AUG PY 1992 VL 115 IS 4 BP 1157 EP 1165 DI 10.2307/2159369 PG 9 WC Mathematics, Applied; Mathematics SC Mathematics GA JF704 UT WOS:A1992JF70400041 ER PT J AU BORM, P OWEN, G TIJS, S AF BORM, P OWEN, G TIJS, S TI ON THE POSITION VALUE FOR COMMUNICATION SITUATIONS SO SIAM JOURNAL ON DISCRETE MATHEMATICS LA English DT Article DE GAME THEORY; GRAPHS; COMMUNICATION; MYERSON VALUE; POSITION VALUE ID GRAPH-RESTRICTED GAMES AB A new solution concept for communication situations is considered: the position value. This concept is based on an evaluation of the importance of the various communication links between the players. An axiomatic characterization of the position value is provided for the class of communication situations where the communication graphs contain no cycles. Furthermore, relations with the Myerson value are discussed, and. for special classes of communication situations, elegant calculation methods for their position values are described. C1 USN,POSTGRAD SCH,DEPT MATH,MONTEREY,CA 93943. RP BORM, P (reprint author), CATHOLIC UNIV NIJMEGEN,NIJMEGEN INST COGNIT RES & INFORMAT TECHNOL,DEPT MATH,TOERNOOIVELD,6525 ED NIJMEGEN,NETHERLANDS. NR 9 TC 90 Z9 97 U1 1 U2 2 PU SIAM PUBLICATIONS PI PHILADELPHIA PA 3600 UNIV CITY SCIENCE CENTER, PHILADELPHIA, PA 19104-2688 SN 0895-4801 J9 SIAM J DISCRETE MATH JI SIAM Discret. Math. PD AUG PY 1992 VL 5 IS 3 BP 305 EP 320 DI 10.1137/0405023 PG 16 WC Mathematics, Applied SC Mathematics GA JF547 UT WOS:A1992JF54700001 ER PT J AU HILL, J LINDSAY, T RUSCHE, J VALERI, CR SHEPRO, D HECHTMAN, HB AF HILL, J LINDSAY, T RUSCHE, J VALERI, CR SHEPRO, D HECHTMAN, HB TI A MAC-1 ANTIBODY REDUCES LIVER AND LUNG INJURY BUT NOT NEUTROPHIL SEQUESTRATION AFTER INTESTINAL ISCHEMIA-REPERFUSION SO SURGERY LA English DT Article; Proceedings Paper CT 53RD ANNUAL MEETING OF THE SOC OF UNIV SURGEONS CY FEB 13-15, 1992 CL CINCINNATI, OH SP SOC UNIV SURGEONS ID TUMOR-NECROSIS-FACTOR; PLATELET-ACTIVATING FACTOR; CHEMOTACTIC FACTORS; LEUKOCYTE ADHESION; ENDOTHELIAL-CELLS; ADHERENCE; MEDIATOR; PROTEINS; MOLECULE; INVITRO AB Background. Intestinal ischemia and reperfusion (I/R) result in leukosequestration and injury to the liver and lungs. The adherence-dependent oxidative burst of neutrophils requires cell adhesion through the Mac-1 integrin. Neutrophil-mediated tissue injury may depend on this specific cell adhesion event. This study tests the effect of a Mac-1 (CD 11b) monoclonal antibody (MAb) (R17) on liver and lung injury after intestinal I/R. Methods. After collaterals were ligated in anesthetized rats, the superior mesenteric artery was clamped for 60 minutes followed by 3 hours of reperfusion. Animals were treated with saline solution, R17, or nonspecific immunoglobulin M. Another nonischemic group of rats were sham controls. Lung and intestinal polymorphonuclear leukocyte sequestration was assessed by measurement of myeloperoxidase and lung permeability by bronchoalveolar lavage blood concentration ratio of I-125-labeled bovine serum albumin. Results. At 3 hours of reperfusion lung and intestinal myeloperoxidase and lung permeability were increased. Treatment with R17 MAb did not reduce intestinal or lung myeloperoxidase but prevented increased lung permeability. Similarly, after treatment with saline solution, liver polymorphonuclear leukocyte sequestration increased after 3 hours of reperfusion and serum alanine aminotransferase level rose eightfold. R17 MAb did not significantly reduce liver neutrophil sequestration; however, it reduced alanine aminotransferase level more than 50% when compared to saline solution controls. At 3 hours of reperfusion there was a leukocytosis (white blood cell count, 14.9 +/- 1.0 X 10(3)/mm vs 6.0 +/- 0.8 in sham [p < 0.05]). The white blood cell count was unaffected by R17 MAb. Conclusions. These data indicate that a MAb to the neutrophil Mac-1 integrin reduces lung and liver injury after intestinal I/R but does not reduce lung or intestinal leukosequestration. C1 HARVARD UNIV,BRIGHAM & WOMENS HOSP,SCH MED,DEPT SURG,75 FRANCIS ST,BOSTON,MA 02115. BOSTON UNIV,USN,BLOOD RES LAB,BOSTON,MA 02215. BOSTON UNIV,CTR BIOL SCI,BOSTON,MA 02215. REPLIGEN CORP,CAMBRIDGE,MA. FU NHLBI NIH HHS [HL 16714-13]; NIGMS NIH HHS [GM 35141-03, GM 24891-11] NR 25 TC 113 Z9 113 U1 0 U2 0 PU MOSBY-YEAR BOOK INC PI ST LOUIS PA 11830 WESTLINE INDUSTRIAL DR, ST LOUIS, MO 63146-3318 SN 0039-6060 J9 SURGERY JI Surgery PD AUG PY 1992 VL 112 IS 2 BP 166 EP 172 PG 7 WC Surgery SC Surgery GA JG451 UT WOS:A1992JG45100006 PM 1353637 ER PT J AU MULL, NH AMUNDSON, DE TRIBLE, WR CALL, TB AF MULL, NH AMUNDSON, DE TRIBLE, WR CALL, TB TI MANIFESTATIONS OF ADULT VARICELLA IN THE UNITED-STATES-NAVY, 1984-1987 SO WESTERN JOURNAL OF MEDICINE LA English DT Letter RP MULL, NH (reprint author), USN HOSP,DEPT CLIN INVEST,SAN DIEGO,CA 92134, USA. NR 8 TC 10 Z9 10 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 0093-0415 J9 WESTERN J MED JI West. J. Med. PD AUG PY 1992 VL 157 IS 2 BP 197 EP 198 PG 2 WC Medicine, General & Internal SC General & Internal Medicine GA JH774 UT WOS:A1992JH77400033 PM 1441491 ER PT J AU VASUDEVAN, AK PETROVIC, JJ AF VASUDEVAN, AK PETROVIC, JJ TI A COMPARATIVE OVERVIEW OF MOLYBDENUM DISILICIDE COMPOSITES SO MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING LA English DT Article; Proceedings Paper CT 1ST WORKSHOP ON HIGH TEMPERATURE STRUCTURAL SILICIDES CY NOV 04-06, 1991 CL NIST, GAITHERSBURG, MD SP USN, OFF NAVAL RES HO NIST ID HIGH-TEMPERATURE DEFORMATION; SINGLE-CRYSTALS; MOSI2; MATRIX AB MoSi2-based composites possess significant potential to meet the demands of advanced high temperature structural applications in the range 1200-1600-degrees-C, in oxidizing and aggressive environments. These materials constitute and important new class of "high temperature structural silicides". The intermetallic compound MoSi2 possesses properties which make it a very desirable matrix for high temperature composites, and these properties are described and compared with those of other high melting point silicides. The developmental history of composites based on MoSi2 is traced from its beginnings to the present. Mechanical property improvements derived from SiC and ZrO2 reinforcements, as well as matrix alloying, are described, and properties of current MoSi2-based composites compared with those of silicon-based structural ceramics. Finally, important research and development directions for the continued improvement of MoSi2-based composites and their use as high temperature structural components are discussed. C1 LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545. RP VASUDEVAN, AK (reprint author), OFF NAVAL RES,ARLINGTON,VA 22217, USA. NR 51 TC 600 Z9 669 U1 17 U2 61 PU ELSEVIER SCIENCE SA LAUSANNE PI LAUSANNE 1 PA PO BOX 564, 1001 LAUSANNE 1, SWITZERLAND SN 0921-5093 J9 MAT SCI ENG A-STRUCT JI Mater. Sci. Eng. A-Struct. Mater. Prop. Microstruct. Process. PD JUL 30 PY 1992 VL 155 IS 1-2 BP 1 EP 17 DI 10.1016/0921-5093(92)90308-N PG 17 WC Nanoscience & Nanotechnology; Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Science & Technology - Other Topics; Materials Science; Metallurgy & Metallurgical Engineering GA JG632 UT WOS:A1992JG63200002 ER PT J AU KIRCHER, TA COURTRIGHT, EL AF KIRCHER, TA COURTRIGHT, EL TI ENGINEERING LIMITATIONS OF MOSI2 COATINGS SO MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING LA English DT Article; Proceedings Paper CT 1ST WORKSHOP ON HIGH TEMPERATURE STRUCTURAL SILICIDES CY NOV 04-06, 1991 CL NIST, GAITHERSBURG, MD SP USN, OFF NAVAL RES HO NIST ID OXIDATION AB An analysis is presented of MoSi2 for use as a protective coating against high temperature oxidation. Environmental issues such as low temperature behavior, passive-active oxidation, cyclic oxidation, and hot corrosion are reviewed. Thermal-mechanical issues such as thermal stresses, interdiffusion, and coating deformation are also presented. The ability of MoSi2 to form a protective silica film over a broad range of temperatures and the demonstrated ability to engineer coatings of MoSi2 suggest that MoSi2 may represent a significant opportunity for advancement in high temperature coating technology relative to current fused slurry silicide technology. C1 USN, CTR AIR DEV, WARMINSTER, PA 18974 USA. PACIFIC NW LAB, RICHLAND, WA 99352 USA. NR 48 TC 73 Z9 79 U1 2 U2 11 PU ELSEVIER SCIENCE SA LAUSANNE PI LAUSANNE 1 PA PO BOX 564, 1001 LAUSANNE 1, SWITZERLAND SN 0921-5093 J9 MAT SCI ENG A-STRUCT JI Mater. Sci. Eng. A-Struct. Mater. Prop. Microstruct. Process. PD JUL 30 PY 1992 VL 155 IS 1-2 BP 67 EP 74 DI 10.1016/0921-5093(92)90313-P PG 8 WC Nanoscience & Nanotechnology; Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Science & Technology - Other Topics; Materials Science; Metallurgy & Metallurgical Engineering GA JG632 UT WOS:A1992JG63200007 ER PT J AU COOK, J KHAN, A LEE, E MAHAPATRA, R AF COOK, J KHAN, A LEE, E MAHAPATRA, R TI OXIDATION OF MOSI2-BASED COMPOSITES SO MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING LA English DT Article; Proceedings Paper CT 1ST WORKSHOP ON HIGH TEMPERATURE STRUCTURAL SILICIDES CY NOV 04-06, 1991 CL NIST, GAITHERSBURG, MD SP USN, OFF NAVAL RES HO NIST ID BEHAVIOR; MATRIX AB The oxidation behavior of MoSi2-based composites reinforced with 30 vol.% TiB2, ZrB2, HfB2 or SiC were tested under isothermal and cyclic conditions at temperatures from 500 to 1500-degrees-C. The effects of thermal cycling on subsequent pesting behavior were studied. A second series of cyclic oxidation and pesting tests was then performed on MoSi2 composites containing from 15 to 45 vol.% TiB2 or SiC, in order to determine the effects of reinforcement volume fraction and porosity on oxidation behavior. Oxidation kinetics of the composites under static pesting (500-degrees-C) conditions and cyclic (1200-degrees-C peak temperature) conditions were studied. Scanning electron microscopy analyses were performed to determine the structures and compositions of the oxide layers formed under various test conditions. RP COOK, J (reprint author), USN,CTR AIR WARFARE,WARMINSTER,PA 18974, USA. NR 46 TC 81 Z9 93 U1 0 U2 8 PU ELSEVIER SCIENCE SA LAUSANNE PI LAUSANNE 1 PA PO BOX 564, 1001 LAUSANNE 1, SWITZERLAND SN 0921-5093 J9 MAT SCI ENG A-STRUCT JI Mater. Sci. Eng. A-Struct. Mater. Prop. Microstruct. Process. PD JUL 30 PY 1992 VL 155 IS 1-2 BP 183 EP 198 DI 10.1016/0921-5093(92)90325-U PG 16 WC Nanoscience & Nanotechnology; Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Science & Technology - Other Topics; Materials Science; Metallurgy & Metallurgical Engineering GA JG632 UT WOS:A1992JG63200019 ER PT J AU MUELLER, A WANG, G RAPP, RA COURTRIGHT, EL KIRCHER, TA AF MUELLER, A WANG, G RAPP, RA COURTRIGHT, EL KIRCHER, TA TI OXIDATION BEHAVIOR OF TUNGSTEN AND GERMANIUM-ALLOYED MOLYBDENUM DISILICIDE COATINGS SO MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING LA English DT Article; Proceedings Paper CT 1ST WORKSHOP ON HIGH TEMPERATURE STRUCTURAL SILICIDES CY NOV 04-06, 1991 CL NIST, GAITHERSBURG, MD SP USN, OFF NAVAL RES HO NIST AB A multicomponent diffusion coating has been developed to protect niobium-base alloys from high temperature oxidation. A solid solution disilicide of molybdenum and tungsten doped with germanium provided the best protection and supported a slow-growing protective silica (SiO2) scale when exposed to high temperature oxidation. The (Mo, W)(Si,Ge)2 coating was made by reacting to a previously sputtered 70at.%Mo-30at.%W deposit in an NaF-activated cementation pack containing silicon and germanium. The germanium addition helped to improve the cyclic oxidation resistance by increasing the thermal expansion coefficient of the silica scale. The germanium also helped to avoid "pesting" (accelerated low temperature oxidation) by providing better sealant coverage at low temperatures. The results of cyclic oxidation tests performed on coated niobium coupons at 925, 1370 and 1540-degrees-C in air are presented. The coated niobium successfully passed 200 cyclic oxidation tests of 1 h at 1370-degrees-C and 60 cycles of 1 h at 1540-degrees-C. These results represent test termination points and not application limits. Accelerated low temperature oxidation and/or "pest" oxidation did not occur when the coatings were exposed to isothermal conditions of up to 200 h in air in the temperature range 500-700-degrees-C. C1 OHIO STATE UNIV, DEPT MAT SCI & ENGN, COLUMBUS, OH 43210 USA. PACIFIC NW LAB, RICHLAND, WA 99352 USA. USN, CTR AIR DEV, DIV AEROSP MAT, WARMINSTER, PA 18974 USA. NR 21 TC 46 Z9 49 U1 4 U2 15 PU ELSEVIER SCIENCE SA LAUSANNE PI LAUSANNE 1 PA PO BOX 564, 1001 LAUSANNE 1, SWITZERLAND SN 0921-5093 J9 MAT SCI ENG A-STRUCT JI Mater. Sci. Eng. A-Struct. Mater. Prop. Microstruct. Process. PD JUL 30 PY 1992 VL 155 IS 1-2 BP 199 EP 207 DI 10.1016/0921-5093(92)90326-V PG 9 WC Nanoscience & Nanotechnology; Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Science & Technology - Other Topics; Materials Science; Metallurgy & Metallurgical Engineering GA JG632 UT WOS:A1992JG63200020 ER PT J AU SADANANDA, K FENG, CR JONES, H PETROVIC, J AF SADANANDA, K FENG, CR JONES, H PETROVIC, J TI CREEP OF MOLYBDENUM DISILICIDE COMPOSITES SO MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING LA English DT Article; Proceedings Paper CT 1ST WORKSHOP ON HIGH TEMPERATURE STRUCTURAL SILICIDES CY NOV 04-06, 1991 CL NIST, GAITHERSBURG, MD SP USN, OFF NAVAL RES HO NIST ID ALLOYS AB The creep deformation behavior of MoSi2, MoSi2 with SiC reinforcement, MoSi2 and WSi2 alloy, and the alloy with SiC reinforcement was determined under compression in the temperature range 1100-1450-degrees-C. The effects of reinforcement and alloying were evaluated. Existing theories of composite strengthening were examined in relation to the present results. Models based on a creeping matrix with elastically deforming fibers appear to predict the observed behavior better than any other models. Activation energies and volumes were evaluated to identify the creep mechanisms. Based on the stress exponents and the energies, it is concluded that creep progresses with increasing temperature and stress from newtonian viscous flow involving diffusion processes to power-law creep involving dislocation climb. C1 LOS ALAMOS NATL LAB,DIV MAT SCI & TECHNOL,LOS ALAMOS,NM 87545. RP SADANANDA, K (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 31 TC 72 Z9 74 U1 1 U2 5 PU ELSEVIER SCIENCE SA LAUSANNE PI LAUSANNE 1 PA PO BOX 564, 1001 LAUSANNE 1, SWITZERLAND SN 0921-5093 J9 MAT SCI ENG A-STRUCT JI Mater. Sci. Eng. A-Struct. Mater. Prop. Microstruct. Process. PD JUL 30 PY 1992 VL 155 IS 1-2 BP 227 EP 239 DI 10.1016/0921-5093(92)90329-Y PG 13 WC Nanoscience & Nanotechnology; Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Science & Technology - Other Topics; Materials Science; Metallurgy & Metallurgical Engineering GA JG632 UT WOS:A1992JG63200023 ER PT J AU VASUDEVAN, AK PETROVIC, JJ AF VASUDEVAN, AK PETROVIC, JJ TI A STRUCTURAL-MATERIALS - PROPERTIES, MICROSTRUCTURE AND PROCESSING - CONTAINING PAPERS PRESENTED AT THE PROCEEDINGS OF THE 1ST HIGH-TEMPERATURE STRUCTURAL SILICIDES WORKSHOP, NOVEMBER 4-6, 1991, GAITHERSBURG, MD, USA - PREFACE SO MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING LA English DT Editorial Material C1 LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545. RP VASUDEVAN, AK (reprint author), OFF NAVAL RES,ARLINGTON,VA 22217, USA. NR 0 TC 6 Z9 6 U1 0 U2 0 PU ELSEVIER SCIENCE SA LAUSANNE PI LAUSANNE 1 PA PO BOX 564, 1001 LAUSANNE 1, SWITZERLAND SN 0921-5093 J9 MAT SCI ENG A-STRUCT JI Mater. Sci. Eng. A-Struct. Mater. Prop. Microstruct. Process. PD JUL 30 PY 1992 VL 155 IS 1-2 BP R5 EP R5 PG 1 WC Nanoscience & Nanotechnology; Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Science & Technology - Other Topics; Materials Science; Metallurgy & Metallurgical Engineering GA JG632 UT WOS:A1992JG63200001 ER PT J AU RUDOLPH, AS TESTOFF, MA SHASHIDAR, R AF RUDOLPH, AS TESTOFF, MA SHASHIDAR, R TI CALORIMETRIC STUDIES OF LIPID TUBULE FORMATION FROM ETHANOL WATER SOLUTIONS SO BIOCHIMICA ET BIOPHYSICA ACTA LA English DT Article DE LIPID; DIACETYLENE; TUBULE; ETHANOL; CALORIMETRY ID PHASE-BEHAVIOR; PHOSPHATIDYLCHOLINE; MICROSTRUCTURES; 1,2-BIS(10,12-TRICOSADIYNOYL)-SN-GLYCERO-3-PHOSPHOCHOLINE; MEMBRANES AB We have used differential scanning calorimetry to systematically investigate the thermal formation of hollow cylindrical crystalline microstructures or 'tubules' upon cooling a diacetylenic phosphatidylcholine (1,2-bis(10,12-tricosadiynoyl)-sn-glycero-3-phosphocholine) dispersed in varying volume fractions of ethanol/water. Tubule formation is characterized by a large exothermic event, observed upon cooling the lipid in 60-80% ethanol. The enthalpy of the transition was observed to be highest in this window of tubule formation (128-138 J/g) which is significantly higher than previously reported values for the enthalpy of tubule formation in water (90-95 J/g). The enthalpy associated with the formation of tubules in 70% ethanol was also found to be strongly dependent on the efficiency of tubule formation and decreased as the number density of tubules decreased. A significant decrease in tubule number density could be brought about by increasing the lipid concentration of the 70% ethanol solution. Tubule number density was maximized at lipid concentrations between 0.5 and 2 mg/ml in 70% ethanol. Examination of the C-H stretch region from infrared spectra of the lipid below the phase transition, indicate that the intramolecular chain order-disorder is similar, regardless of the fraction of ethanol. The higher transition enthalpy for the melting of tubules in 60-80% ethanol.(compared to water) implies that the high-temperature phase from which the tubules form in ethanol is more disordered than the lamellar liquid crystalline phase from which tubules form in water. RP RUDOLPH, AS (reprint author), USN,CTR BIOMOLEC SCI & ENGN,CODE 6090,WASHINGTON,DC 20375, USA. NR 25 TC 8 Z9 8 U1 0 U2 5 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0006-3002 J9 BIOCHIM BIOPHYS ACTA PD JUL 29 PY 1992 VL 1127 IS 2 BP 186 EP 190 DI 10.1016/0005-2760(92)90276-2 PG 5 WC Biochemistry & Molecular Biology; Biophysics SC Biochemistry & Molecular Biology; Biophysics GA JH548 UT WOS:A1992JH54800012 PM 1643105 ER PT J AU HALL, DC GOLDBERG, L MEHUYS, D AF HALL, DC GOLDBERG, L MEHUYS, D TI TECHNIQUE FOR LATERAL TEMPERATURE PROFILING IN OPTOELECTRONIC DEVICES USING A PHOTOLUMINESCENCE MICROPROBE SO APPLIED PHYSICS LETTERS LA English DT Article ID RAMAN MICROPROBE; LASERS; AMPLIFIER AB A photoluminescence microprobe technique with less-than-or-equal-to 0.2-degrees-C and < 5-mu-m resolution is demonstrated for measuring lateral temperature profiles in GaAs-based optoelectronic devices. The technique is used to measure the junction-heating induced temperature gradient in both single-stripe and broad-area diode lasers. The effective focal length of the thermally induced refractive index gradient lens is determined from the temperature gradient in a broad-area device. C1 SPECTRA DIODE LABS,SAN JOSE,CA 95134. RP HALL, DC (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 13 TC 59 Z9 61 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 JUL 27 PY 1992 VL 61 IS 4 BP 384 EP 386 DI 10.1063/1.107890 PG 3 WC Physics, Applied SC Physics GA JE821 UT WOS:A1992JE82100005 ER PT J AU TSAI, TE ASKINS, CG FRIEBELE, EJ AF TSAI, TE ASKINS, CG FRIEBELE, EJ TI PHOTOINDUCED GRATING AND INTENSITY DEPENDENCE OF DEFECT GENERATION IN GE-DOPED SILICA OPTICAL FIBER SO APPLIED PHYSICS LETTERS LA English DT Article ID BRAGG GRATINGS; CENTERS; PHOTOSENSITIVITY AB Ge E' centers photoinduced in Ge-doped silica by 5 eV photons of various intensities and fluences were found by electron spin resonance to be induced and bleached by one- and two-photon absorption processes, respectively. The observation that Ge E'-type centers are the only paramagnetic centers induced by very low intensity 5 eV photons in Ge-doped silica supports the proposal that Ge E'-type centers are responsible for the photoinduced gratings observed in both Bragg grating and second-harmonic generation fibers. C1 GEOCENTERS INC,FT WASHINGTON,MD 20744. RP TSAI, TE (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 14 TC 37 Z9 38 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 27 PY 1992 VL 61 IS 4 BP 390 EP 392 DI 10.1063/1.107892 PG 3 WC Physics, Applied SC Physics GA JE821 UT WOS:A1992JE82100007 ER PT J AU GLESENER, JW MORRISH, AA SNAIL, KA AF GLESENER, JW MORRISH, AA SNAIL, KA TI ELECTRON-BEAM MODIFICATION OF THE SCHOTTKY DIODE CHARACTERISTICS OF DIAMOND SO APPLIED PHYSICS LETTERS LA English DT Article AB Electron beam irradiation from a scanning electron microscope has been shown to improve the rectification characteristics of a boron doped diamond sample, as evidenced by measurement of a lowered reverse current in Al Schottky diodes. The sample processing procedure consisted of cleaning in heated CrO3/H2SO4 and NH4OH/H2O2 Mixtures, exposure to an electron beam, a post-exposure cleaning in NH4OH/H2O2, and metallization. Since published information on the effect of CrO3/H2SO4 and NH4OH/H2O2 mixtures on the diamond surface is lacking, we hypothesize that the exposure of the diamond surface to an electron beam releases hydrogen from the surface, while the post-irradiation clean in boiling NH4OH/H2O2 may oxygenate the diamond surface. This result is consistent with previous work which demonstrated that annealing in hydrogen and oxygen ambients affected the surface resistance of diamond. These results indicate a high surface resistance is necessary to form good Schottky junctions in diamond. RP GLESENER, JW (reprint author), USN,RES LAB,DIV OPT SCI,CODE 6522,WASHINGTON,DC 20375, USA. NR 7 TC 7 Z9 7 U1 0 U2 1 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0003-6951 J9 APPL PHYS LETT JI Appl. Phys. Lett. PD JUL 27 PY 1992 VL 61 IS 4 BP 429 EP 431 DI 10.1063/1.107904 PG 3 WC Physics, Applied SC Physics GA JE821 UT WOS:A1992JE82100020 ER PT J AU DENARDO, B LARRAZA, A PUTTERMAN, S ROBERTS, P AF DENARDO, B LARRAZA, A PUTTERMAN, S ROBERTS, P TI NONLINEAR-THEORY OF LOCALIZED STANDING WAVES SO PHYSICAL REVIEW LETTERS LA English DT Article ID SOLITON AB An investigation of the nonlinear dispersive equations of continuum mechanics reveals localized standing-wave solutions that are domain walls between regions of different wave number. These states can appear even when the dispersion law is a single-valued function of the wave number. In addition, we calculate solutions for kinks in cutoff and noncutoff modes, as well as cutoff breather solitons. C1 UNIV CALIF LOS ANGELES,DEPT PHYS,LOS ANGELES,CA 90024. UNIV CALIF LOS ANGELES,DEPT MATH,LOS ANGELES,CA 90024. RP DENARDO, B (reprint author), USN,POSTGRAD SCH,DEPT PHYS,MONTEREY,CA 93943, USA. NR 12 TC 14 Z9 14 U1 0 U2 2 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0031-9007 J9 PHYS REV LETT JI Phys. Rev. Lett. PD JUL 27 PY 1992 VL 69 IS 4 BP 597 EP 600 DI 10.1103/PhysRevLett.69.597 PG 4 WC Physics, Multidisciplinary SC Physics GA JE754 UT WOS:A1992JE75400012 ER PT J AU DECOSTA, BR IADAROLA, MJ ROTHMAN, RB BERMAN, KF GEORGE, C NEWMAN, AH MAHBOUBI, A JACOBSON, AE RICE, KC AF DECOSTA, BR IADAROLA, MJ ROTHMAN, RB BERMAN, KF GEORGE, C NEWMAN, AH MAHBOUBI, A JACOBSON, AE RICE, KC TI PROBES FOR NARCOTIC RECEPTOR MEDIATED PHENOMENA .18. EPIMERIC 6-ALPHA-IODO-3,14-DIHYDROXY-17-(CYCLOPROPYLMETHYL)-4,5-ALPHA-EPOXYMORPHI NANS AND 6-BETA-IODO-3,14-DIHYDROXY-17-(CYCLOPROPYLMETHYL)-4,5-ALPHA-EPOXYMORPHIN ANS AS POTENTIAL LIGANDS FOR OPIOID RECEPTOR SINGLE PHOTON-EMISSION COMPUTED-TOMOGRAPHY - SYNTHESIS, EVALUATION, AND RADIOCHEMISTRY OF [I-125] 6-BETA-IODO-3,14-DIHYDROXY-17-(CYCLOPROPYLMETHYL)-4,5-ALPHA-EPOXYMORPHIN AN SO JOURNAL OF MEDICINAL CHEMISTRY LA English DT Article ID OPIATE ANTAGONIST CYCLOFOXY; C-11 CARFENTANIL BINDING; RAT-BRAIN; INACTIVE ENANTIOMERS; SUBTYPES INVITRO; SELECTIVE LIGAND; KINETIC-ANALYSIS; INVIVO; SITES; NORBINALTORPHIMINE AB The epimeric 6-beta- and 6-alpha-iodo-3,14-dihydroxy-17-(cyclopropylmethyl)-4,5-alpha-epoxymorphinans (1, ioxy) and (2, epioxy), respectively, were each synthesized in five steps starting with naltrexone. The configuration of the 6-iodo group of 1 was unequivocally determined to be beta-based on single crystal X-ray analysis of its precursor 3-acetoxy-6-beta-iodo-14-hydroxy-17-(cyclopropylmethyl)-4,5-alpha-epoxymorphinan (10). Both 1 and 2 as well as their corresponding 3-O-acetates 10 and 11 were found to readily cross the blood-brain barrier and completely reverse the analgesic effects of a 10 mg/kg intraperitoneal dose of morphine sulfate as determined by the paw withdrawal latency test. Compounds 1 and 2 were found to bind with high affinity to mu, delta, and kappa-receptors in vitro. In general, 1 and 2 exhibited higher affinity for mu and kappa-receptors than naltrexone while the 6-beta-iodo epimer 1 (ioxy) was more potent than its epimer 2. In a comparison of the 6-beta-halogen substituent on binding affinity across opioid receptor subtypes, it was generally found that I > Br > F. On the basis of the results of in vitro and in vivo testing, 1 was selected as a target for radioiodination and evaluation as a potential single photon emission computed tomography imaging agent for opioid receptors. Carrier-free [I-125]-1 was synthesized in near quantitative yield by the sequence of reaction of excess 3-acetoxy-6-alpha-[[(trifluoromethyl)sulfonyl]oxy]-14-hydroxy-17-(cyclopropylmethyl)-4,5-alpha-epoxymorphinan (8) with anhydrous (NaI)-I-125 in dry acetonitrile for 90 min at 76-degrees-C followed by deacetylation of the product with 1:1 aqueous ammonia/acetonitrile at 25-degrees-C. The potential of [I-125]-1 as an in vivo imaging agent for opioid receptors is evaluated and discussed. C1 NIDDKD,MED CHEM LAB,ROOM B1-23,BLDG 8,9000 ROCKVILLE PIKE,BETHESDA,MD 20892. NIDA,ADDICT RES CTR,PSYCHOBIOL LAB,BALTIMORE,MD 21224. NIDR,NEUROBIOL & ANESTHESIOL BRANCH,BETHESDA,MD 20892. NIMH,CLIN BRAIN DISORDERS BRANCH,WASHINGTON,DC 20032. USN,RES LAB,WASHINGTON,DC 20375. NIDA,ADDICT RES CTR,CLIN PSYCHOPHARMACOL LAB,BALTIMORE,MD 21224. NR 71 TC 30 Z9 30 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 JUL 24 PY 1992 VL 35 IS 15 BP 2826 EP 2835 DI 10.1021/jm00093a016 PG 10 WC Chemistry, Medicinal SC Pharmacology & Pharmacy GA JF496 UT WOS:A1992JF49600016 PM 1322988 ER PT J AU ROBERTSON, DH BRENNER, DW WHITE, CT AF ROBERTSON, DH BRENNER, DW WHITE, CT TI ON THE WAY TO FULLERENES - MOLECULAR-DYNAMICS STUDY OF THE CURLING AND CLOSURE OF GRAPHITIC RIBBONS SO JOURNAL OF PHYSICAL CHEMISTRY LA English DT Letter ID C-60; CARBON; HYDROCARBONS AB The short-time behavior of isolated graphitic ribbons is simulated at high temperature using a model hydrocarbon potential. These ribbons show large instantaneous deviations from planarity that often result in the formation of open-ended hollow carbon structures representing good fullerene precursors. While confirming the importance of pentagon formation in the production of these precursors, these results also point to the central role of relatively high temperatures in these processes. RP ROBERTSON, DH (reprint author), USN,RES LAB,THEORET CHEM SECT,CODE 6179,WASHINGTON,DC 20375, USA. RI Brenner, Donald/D-1741-2009 NR 20 TC 98 Z9 102 U1 0 U2 7 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0022-3654 J9 J PHYS CHEM-US JI J. Phys. Chem. PD JUL 23 PY 1992 VL 96 IS 15 BP 6133 EP 6135 DI 10.1021/j100194a011 PG 3 WC Chemistry, Physical SC Chemistry GA JF326 UT WOS:A1992JF32600011 ER PT J AU SEAVER, M PEELE, JR MANUCCIA, TJ RUBEL, GO RITCHIE, G AF SEAVER, M PEELE, JR MANUCCIA, TJ RUBEL, GO RITCHIE, G TI EVAPORATION KINETICS OF VENTILATED WATERDROPS COATED WITH OCTADECANOL MONOLAYERS SO JOURNAL OF PHYSICAL CHEMISTRY LA English DT Article ID WIND-TUNNEL AB We have used remote thermometry and video microscopy to monitor simultaneously the temperature and size of evaporating waterdrops coated with monolayers of 1-octadecanol (stearyl alcohol). The experiments are conducted by acoustically levitating individual, 1-3-mm-diameter waterdrops in a 1.5 m/s nitrogen flow conditioned at 0, 35, and 64% relative humidity. We observe a continuous increase in monolayer resistivity as evaporation compresses the monolayer. The change in monolayer resistivity is independent of relative humidity. However, the rate of the resistivity increase is inversely proportional to the relative humidity. Remote drop temperature measurements show that the drop remains in thermal steady state with its surroundings during the monolayer phase change. We show that the additive Eu(EDTA), necessary for remote thermometry, accelerates the onset of the monolayer phase transition and reduces the final resistivity of the monolayer without effecting the monolayer during the phase change. We also discuss the appropriate use of accommodation coefficients and report them when possible. C1 USA,ARMAMENT MUNIT & CHEM COMMAND,CTR CHEM RES DEV & ENGN,ABERDEEN PROVING GROUND,MD 21010. RIDER COLL,DEPT PHYS,LAWRENCEVILLE,NJ 08648. RP SEAVER, M (reprint author), USN,RES LAB,CODE 6540,WASHINGTON,DC 20375, USA. NR 23 TC 13 Z9 13 U1 1 U2 5 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0022-3654 J9 J PHYS CHEM-US JI J. Phys. Chem. PD JUL 23 PY 1992 VL 96 IS 15 BP 6389 EP 6394 DI 10.1021/j100194a053 PG 6 WC Chemistry, Physical SC Chemistry GA JF326 UT WOS:A1992JF32600053 ER PT J AU NGAI, KL ROLAND, CM OREILLY, JM SEDITA, JS AF NGAI, KL ROLAND, CM OREILLY, JM SEDITA, JS TI TRENDS IN THE TEMPERATURE DEPENDENCY OF SEGMENTAL RELAXATION IN TMPC PS BLENDS SO MACROMOLECULES LA English DT Article ID MISCIBLE POLYMER BLENDS; SUPERPOSITION; POLYISOPRENE; BREAKDOWN AB A model to account for the composition dependence and shape of the relaxation spectra of miscible blends in the glass transition zone is applied to dielectric measurements on tetramethyl-Bisphenol A polycarbonate (TMPC) mixed with polystyrene (PS). The shape of the dispersion associated with segmental relaxation is governed primarily by the fluctuations in the degree of cooperativity associated with the distribution in local composition arising from concentration fluctuations. A blend of fixed composition possesses a distribution of local environments; these effect a distribution in the degree of cooperativity of the segmental relaxation of locally rearranging chain units. Pure PS has a lower T(g) than TMPC. Hence, in the blend before cooperative dynamics is considered, PS chains will tend to have segmentally relaxed when segmental relaxation of TMPC is considered. The dynamical constraints imposed by PS segments in a local environment of TMPC are thus mitigated, allowing TMPC segmental relaxation to proceed with a lower degree of intermolecular cooperativity than is the case in less PS-rich environments. The temperature dependence of the frequency-temperature shift factors for the blend are governed by the degree of intermolecular cooperativity of the segmental relaxation. Hence, there exists a direct and verifiable relation between frequency and temperature dependencies of the mixture. The present data on TMPC/PS, though not sufficient to entirely demonstrate such a relationship, are nevertheless consistent with the predicted relation. C1 USN,RES LAB,WASHINGTON,DC 20375. EASTMAN KODAK CO,CORP RES LABS,ROCHESTER,NY 14650. NR 17 TC 42 Z9 42 U1 0 U2 1 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0024-9297 J9 MACROMOLECULES JI Macromolecules PD JUL 20 PY 1992 VL 25 IS 15 BP 3906 EP 3909 DI 10.1021/ma00041a013 PG 4 WC Polymer Science SC Polymer Science GA JE746 UT WOS:A1992JE74600013 ER PT J AU CHAYKOVSKY, M KOPPES, WM RUSSELL, TP GILARDI, R GEORGE, C FLIPPENANDERSON, JL AF CHAYKOVSKY, M KOPPES, WM RUSSELL, TP GILARDI, R GEORGE, C FLIPPENANDERSON, JL TI THE ISOLATION OF A BI(2,4,6,8-TETRAAZABICYCLO[3.3.0]OCTANE) FROM THE REACTION OF GLYOXAL WITH BENZYLAMINE SO JOURNAL OF ORGANIC CHEMISTRY LA English DT Note C1 USN,RES LAB,STRUCT MATTER LAB,WASHINGTON,DC 20375. RP CHAYKOVSKY, M (reprint author), USN,CTR SURFACE WARFARE,DIV ENERGET MAT,SILVER SPRING,MD 20903, USA. NR 10 TC 9 Z9 9 U1 0 U2 3 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 JUL 17 PY 1992 VL 57 IS 15 BP 4295 EP 4297 DI 10.1021/jo00041a044 PG 3 WC Chemistry, Organic SC Chemistry GA JE835 UT WOS:A1992JE83500044 ER PT J AU KYONO, CS BINARI, SC KRUPPA, W IKOSSIANASTASIOU, K HIER, HS AF KYONO, CS BINARI, SC KRUPPA, W IKOSSIANASTASIOU, K HIER, HS TI INALAS/INGAAS HETEROJUNCTION BIPOLAR-TRANSISTORS WITH ALAS ETCH-STOP LAYER SO ELECTRONICS LETTERS LA English DT Article DE BIPOLAR DEVICES; TRANSISTORS; SEMICONDUCTOR DEVICES AND MATERIALS AB A seven monolayer AlAs layer was used as an etch stop at the emitter-base heterojunction of an Npn In0.52Al0.48As/In0.53Ga0.47As HBT. The etch-stop HBTs displayed higher DC gain and similar microwave performance when compared to devices without the AlAs layer. C1 SFA INC,LANDOVER,MD 20785. LOUISIANA STATE UNIV,BATON ROUGE,LA 70803. ALLIED SIGNAL AEROSP CO,COLUMBIA,MD 21045. RP KYONO, CS (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 4 TC 3 Z9 3 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 JUL 16 PY 1992 VL 28 IS 15 BP 1388 EP 1390 DI 10.1049/el:19920883 PG 3 WC Engineering, Electrical & Electronic SC Engineering GA JF061 UT WOS:A1992JF06100011 ER PT J AU MCLAREN, AS WALSH, JE BOURKE, RH WEAVER, RL WITTMANN, W AF MCLAREN, AS WALSH, JE BOURKE, RH WEAVER, RL WITTMANN, W TI VARIABILITY IN SEA-ICE THICKNESS OVER THE NORTH-POLE FROM 1977 TO 1990 SO NATURE LA English DT Article ID ARCTIC BASIN AB CHANGES in the thickness of polar sea-ice have the potential to provide a signal of climate change, but attempts to identify trends must take into account the range of natural variability. Here we present an analysis of measurements of the subsurface ice thickness (draft) of sea-ice around the North Pole made from 1977 to 1990. These data were collected during six submarine cruises in late April/early May of 1977, 1979, 1986, 1987, 1988 and 1990, and represent the most extensive dataset so far for ice draft in the central Arctic at the same season and location. The results reveal considerable interannual variability both in mean ice draft (+/-1.0 m) and in open-water extent (+/-2.5%). This variability limits the confidence that can be placed in any apparent trends observed for sea-ice thickness or type since the late 1970s, and illustrates the need for a reliable baseline against which to assess future trends. C1 SCI SERV INC,WASHINGTON,DC 20036. UNIV ILLINOIS,DEPT ATMOSPHER SCI,URBANA,IL 61801. USN,POSTGRAD SCH,DEPT OCEANOG,MONTEREY,CA 93943. UNIV COLORADO,NOAA,COOPERAT INST RES ENVIRONM SCI,BOULDER,CO 80309. RP MCLAREN, AS (reprint author), COLUMBIA UNIV,LAMONT DOHERTY GEOL OBSERV,PALISADES,NY 10964, USA. NR 9 TC 22 Z9 22 U1 2 U2 4 PU MACMILLAN MAGAZINES LTD PI LONDON PA PORTERS SOUTH, 4 CRINAN ST, LONDON, ENGLAND N1 9XW SN 0028-0836 J9 NATURE JI Nature PD JUL 16 PY 1992 VL 358 IS 6383 BP 224 EP 226 DI 10.1038/358224a0 PG 3 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA JD587 UT WOS:A1992JD58700050 ER PT J AU WULFSBERG, EA CURTIS, J JAYNE, CH AF WULFSBERG, EA CURTIS, J JAYNE, CH TI CHONDRODYSPLASIA PUNCTATA - A BOY WITH X-LINKED RECESSIVE CHONDRODYSPLASIA PUNCTATA DUE TO AN INHERITED X-Y TRANSLOCATION WITH A CURRENT CLASSIFICATION OF THESE DISORDERS SO AMERICAN JOURNAL OF MEDICAL GENETICS LA English DT Article DE ICHTHYOSIS; STEROID SULFATASE DEFICIENCY; KALLMANN SYNDROME; MENTAL RETARDATION ID STEROID SULFATASE; SHORT ARM; CHROMOSOME; GENE; DELETION; ICHTHYOSIS; DEFICIENCY; DISEASE AB Chondrodysplasia punctata (CDP) is a heterogeneous group of rare bone dysplasias characterized by punctate calcification of cartilage. The punctate calcifications are non-specific and have been seen in a wide variety of disorders including the Zellweger syndrome, warfarin, dilantin, alcohol and rubella embryopathies, vitamin-K-epoxide-reductase deficiency, chromosome trisomies 18 and 21, the Smith-Lemli-Opitz syndrome, prenatal infectious chondritis, hypothyroidism, and other rare disorders. We report on a boy with short stature, developmental delay, na. sal hypoplasia, telebrachydactyly, hypoplastic genitalia, CDP, ichthyosis, hypoplastic genitalia, and a 46 - X, + der(X),t(X;Y)(p22.3 1; q11.21), Y karyotype. Genomic DNA probe analysis was interpreted as showing that the translocation breakpoint was within the X-linked Kallmann syndrome gene. We review a current classification of these disorders that includes 3 well-defined single gene disorders. These include an autosomal recessive rhizomelic type with early lethality, an X-linked dominant type with presumed male lethality, and an X-linked recessive type that has only been described as part of a contiguous gene deletion syndrome. C1 UNIFORMED SERV UNIV HLTH SCI,USN,NATL MED CTR,BETHESDA,MD 20814. NICHOLS INST,SAN JUAN CAPISTRANO,CA. NR 46 TC 38 Z9 38 U1 0 U2 0 PU WILEY-LISS PI NEW YORK PA DIV JOHN WILEY & SONS INC 605 THIRD AVE, NEW YORK, NY 10158-0012 SN 0148-7299 J9 AM J MED GENET JI Am. J. Med. Genet. PD JUL 15 PY 1992 VL 43 IS 5 BP 823 EP 828 DI 10.1002/ajmg.1320430514 PG 6 WC Genetics & Heredity SC Genetics & Heredity GA JD133 UT WOS:A1992JD13300013 PM 1642270 ER PT J AU AGARWALLA, S MELLOR, IR SANSOM, MSP KARLE, IL FLIPPENANDERSON, JL UMA, K KRISHNA, K SUKUMAR, M BALARAM, P AF AGARWALLA, S MELLOR, IR SANSOM, MSP KARLE, IL FLIPPENANDERSON, JL UMA, K KRISHNA, K SUKUMAR, M BALARAM, P TI ZERVAMICINS, A STRUCTURALLY CHARACTERIZED PEPTIDE MODEL FOR MEMBRANE ION CHANNELS SO BIOCHEMICAL AND BIOPHYSICAL RESEARCH COMMUNICATIONS LA English DT Article ID ALAMETHICIN; POLYPEPTIDES; HELIX C1 INDIAN INST SCI,MOLEC BIOPHYS UNIT,BANGALORE 560012,KARNATAKA,INDIA. UNIV NOTTINGHAM,DEPT ZOOL,NOTTINGHAM NG7 2RD,ENGLAND. USN,RES LAB,STRUCT MATTER LAB,WASHINGTON,DC 20375. FU NIGMS NIH HHS [GM30902]; Wellcome Trust NR 29 TC 15 Z9 15 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 0006-291X J9 BIOCHEM BIOPH RES CO JI Biochem. Biophys. Res. Commun. PD JUL 15 PY 1992 VL 186 IS 1 BP 8 EP 15 DI 10.1016/S0006-291X(05)80768-5 PG 8 WC Biochemistry & Molecular Biology; Biophysics SC Biochemistry & Molecular Biology; Biophysics GA JE599 UT WOS:A1992JE59900002 PM 1378732 ER PT J AU LAL, RB RUDOLPH, DL COLIGAN, JE BRODINE, SK ROBERTS, CR AF LAL, RB RUDOLPH, DL COLIGAN, JE BRODINE, SK ROBERTS, CR TI FAILURE TO DETECT EVIDENCE OF HUMAN T-LYMPHOTROPIC VIRUS (HTLV) TYPE-I AND TYPE-II IN BLOOD-DONORS WITH ISOLATED GAG ANTIBODIES TO HTLV-I/II SO BLOOD LA English DT Article ID MONOCLONAL-ANTIBODY; INFECTION; SEQUENCE; ANTIGEN; PROTEINS; HOMOLOGY; DEFINES; REGION C1 NIAID,BIOL RESOURCE BRANCH,BETHESDA,MD 20892. USN HOSP,HLTH RES CTR,SAN DIEGO,CA 92134. WALTER REED ARMY MED CTR,DEPT DIAGNOST RETROVIROL,WASHINGTON,DC 20307. RP LAL, RB (reprint author), CTR DIS CONTROL,NATL CTR INFECT DIS,DIV VIRAL & RICKETTSIAL DIS,ATLANTA,GA 30333, USA. NR 35 TC 58 Z9 59 U1 0 U2 2 PU W B SAUNDERS CO PI PHILADELPHIA PA INDEPENDENCE SQUARE WEST CURTIS CENTER, STE 300, PHILADELPHIA, PA 19106-3399 SN 0006-4971 J9 BLOOD JI Blood PD JUL 15 PY 1992 VL 80 IS 2 BP 544 EP 550 PG 7 WC Hematology SC Hematology GA JD588 UT WOS:A1992JD58800033 PM 1627806 ER PT J AU FREDRICKSEN, H AF FREDRICKSEN, H TI A NEW LOOK AT THE DEBRUIJN GRAPH SO DISCRETE APPLIED MATHEMATICS LA English DT Article AB The Good-de Bruijn graph was originally defined to settle a question of existence of a certain shift register sequence, namely a binary cycle of length 2n containing each of the different binary n-tuples. The further properties of the graph have been studied by several authors. Because the graph is non-planar planar and fairly complicated to draw for longer shift register lengths there have been several attempts to improve the description of the graph. We detail several of these attempts. Each description has its positive and negative features. Most assuredly each possible description of the graph illustrates some features and hides others. As the de Bruijn graph possesses dozens of interesting properties, each different presentation will have its own advantages. Finally, while considering an esoteric property that the graph possesses, the ultimate depiction of the graph, in the author's view, has emerged. This version of the de Bruijn graph is the primary subject of the paper. "Would you tell me, please, which way I ought to go from here?" "That depends a good deal on where you want to get to," said the cat. "I don't much care where-," said Alice. "Then it doesn't matter which way you go," said the cat. Chapter 7, Alices Adventures in Wonderland RP USN, POSTGRAD SCH, DEPT MATH, CODE MA, MONTEREY, CA 93943 USA. NR 10 TC 4 Z9 4 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0166-218X EI 1872-6771 J9 DISCRETE APPL MATH JI Discret Appl. Math. PD JUL 15 PY 1992 VL 37-8 BP 193 EP 203 DI 10.1016/0166-218X(92)90133-U PG 11 WC Mathematics, Applied SC Mathematics GA JH950 UT WOS:A1992JH95000015 ER PT J AU OTTINGER, PF ROSE, DV NERI, JM OLSON, CL AF OTTINGER, PF ROSE, DV NERI, JM OLSON, CL TI BALLISTIC TRANSPORT AND SOLENOIDAL FOCUSING OF INTENSE ION-BEAMS FOR INERTIAL CONFINEMENT FUSION SO JOURNAL OF APPLIED PHYSICS LA English DT Article ID DESIGN; DIODE AB Light-ion inertial confinement fusion requires beam transport over distances of a few meters for isolation of the diode hardware from the target explosion and for power compression by time-of-flight bunching. This paper evaluates ballistic transport of light-ion beams focused by a solenoidal lens. The ion beam is produced by an annular magnetically insulated diode and is extracted parallel to the axis by appropriate shaping of the anode surface. The beam propagates from the diode to the solenoidal lens in a field-free drift region. The lens alters the ion trajectories such that the beam ballistically focuses onto a target while propagating in a second field-free region between the lens and the target. Ion orbits are studied to determine the transport efficiency eta(t) (i.e., the fraction of the beam emitted from the diode which hits the target) under various conditions relevant to light-ion inertial confinement fusion. Analytic results are given for a sharp boundary, finite thickness solenoidal lens configuration, and numerical results are presented for a more realistic lens configuration. From the analytic results, it is found that eta(t) can be in the range of 75%-100% for parameter values that appear to be achievable. Numerical results show that using a more realistic magnetic-field profile for the lens yields similar values of eta(t) for small radius diodes but significantly reduced values of eta(t) for large radius diodes. This reduction results from the radial gradient in the focusing field at larger radius. C1 SANDIA NATL LABS,ALBUQUERQUE,NM 87185. JAYCOR,VIENNA,VA 22182. RP OTTINGER, PF (reprint author), USN,RES LAB,DIV PLASMA PHYS,WASHINGTON,DC 20375, USA. NR 22 TC 20 Z9 20 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 JUL 15 PY 1992 VL 72 IS 2 BP 395 EP 404 DI 10.1063/1.351867 PG 10 WC Physics, Applied SC Physics GA JD971 UT WOS:A1992JD97100009 ER PT J AU YANG, MJ MOORE, WJ WAGNER, RJ WATERMAN, JR YANG, CH THOMPSON, PE DAVIS, JL AF YANG, MJ MOORE, WJ WAGNER, RJ WATERMAN, JR YANG, CH THOMPSON, PE DAVIS, JL TI ELECTRONIC-PROPERTIES OF SILICON DELTA-DOPED INSB SO JOURNAL OF APPLIED PHYSICS LA English DT Article ID CYCLOTRON-RESONANCE; INVERSION-LAYERS; PHYSICS; GAS AB We have investigated magneto-transport and cyclotron resonance (CR) of two-dimensional electron gas in silicon delta-doped p-InSb under a magnetic field of up to 12 T at 4.2 K. Because there are multiple subbands occupied, Shubnikov-de Haas oscillations show a beating behavior. The CR spectra also display several peaks originating from different subbands. Effective masses of electrons associated with the lowest three subbands can therefore be directly determined, and they are in excellent agreement with a self-consistent calculation, which takes into account the electrostatic Poisson equation, the Schrodinger equation, and realistic sample parameters. Furthermore, we observed an absorption peak, whose resonance position has anomalous angle dependence. It is attributed to impurity CR where donors are in the vicinity of the delta-doped sheet. C1 UNIV MARYLAND,DEPT ELECT ENGN,JOINT PROGRAM ADV ELECTR,COLLEGE PK,MD 20742. RP YANG, MJ (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 21 TC 10 Z9 10 U1 0 U2 3 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0021-8979 J9 J APPL PHYS JI J. Appl. Phys. PD JUL 15 PY 1992 VL 72 IS 2 BP 671 EP 675 DI 10.1063/1.351850 PG 5 WC Physics, Applied SC Physics GA JD971 UT WOS:A1992JD97100049 ER PT J AU WOODY, DL AF WOODY, DL TI 2-DIMENSIONAL INFRARED RESOLUTION OF SHEAR BANDS FORMED DURING LOW VELOCITY IMPACTS OF NACL-CRYSTALS USING FAST INFRARED DETECTORS SO JOURNAL OF APPLIED PHYSICS LA English DT Article ID SHOCK AB NaCl crystals were subjected to low velocity impacts provided by a drop weight impact machine. The shear bands were imaged with the use of arrays of fast responding infrared detectors. The detectors monitored the amount of energy given off as infrared photons by the impacted crystalline solid. The main emphasis of this study was the real time observance of the shear band formation during the impact. The signal was recorded over the duration of the impact, heating of the solid during its crushing, and the relaxation of the crystal. These crushing processes occurred over a 40-100-mu-s timescale. Rapid infrared photons corresponding to shear banding were recorded on a 30-90 ns timescale. C1 AMERICAN UNIV,DEPT PHYS,WASHINGTON,DC 20016. RP WOODY, DL (reprint author), USN,CTR SURFACE WARFARE,WHITE OAK,MD 20903, USA. NR 9 TC 2 Z9 2 U1 0 U2 1 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0021-8979 J9 J APPL PHYS JI J. Appl. Phys. PD JUL 15 PY 1992 VL 72 IS 2 BP 783 EP 787 DI 10.1063/1.351811 PG 5 WC Physics, Applied SC Physics GA JD971 UT WOS:A1992JD97100066 ER PT J AU MORISON, JH MCPHEE, MG CURTIN, TB PAULSON, CA AF MORISON, JH MCPHEE, MG CURTIN, TB PAULSON, CA TI THE OCEANOGRAPHY OF WINTER LEADS SO JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS LA English DT Article ID BOUNDARY-LAYER; SEA ICE; MODEL; EXCHANGE; GROWTH; OCEAN AB Leads in pack ice have long been considered important to the thermodynamics of the polar regions. A winter lead affects the ocean around it because it is a density source. As the surface freezes, salt is rejected and forms more dense water which sinks under the lead. This sets up a circulation with freshwater flowing in from the sides near the surface and dense water flowing away from the lead at the base of the mixed layer. If the mixed layer is fully turbulent, this pattern may not occur; rather, the salt rejected at the surface may simply mix into the surface boundary layer. In either event the instability produced at the surface of leads is the primary source of unstable buoyancy flux and, as such, exerts a strong influence on the mixed layer. Here as many as possible of the disparate and almost anecdotal observations of lead oceanography are assembled and combined with theoretical arguments to predict the form and scale of oceanographic disturbances caused by winter leads. The experimental data suggest the velocity disturbances associated with lead convection are about 1-5 cm s-1. These appear as jets near the surface and the base of the mixed layer when ice velocities across the lead are less than about 5 cm s-1. The salinity disturbances are about 0.01 to 0.05 psu. Scaling arguments suggest that the geostrophic currents set up by the lead density disturbances are also of the order of 1-5 cm s-1. The disturbances are most obvious when freezing is rapid and ice velocity is low because the salinity and velocity disturbances in the upper ocean are not smeared out by turbulence. In this vein, lead convection may be characterized at one extreme as free convection in which the density disturbance forces the circulation. At the other extreme, lead convection may be characterized as forced convection in which the density disturbance is mixed rapidly by boundary layer turbulence. The lead number L(o), which is the ratio of the pressure term to the turbulence term in the momentum equation, and the turbulent lead number L(ot), which is the ratio of buoyant production to shear production in the turbulent kinetic energy equation, define the boundary between the free and forced regimes. For L(o) and L(ot) less than one, both the large-scale circulation and the turbulence are forced by surface stress. For L(o) and L(ot) greater than one, both the large-scale circulation and the turbulence are forced by the buoyancy flux. The magnitudes of velocity and salinity disturbances from a model developed elsewhere, suitable to free convection. agree with what few observations we have. The results of a forced convection model, developed here, suggest salinity disturbances of the order of 0.01-0.02 practical salinity units, with the maximum occurring at the surface of the lead and decreasing substantially below 5-10 m. This unstable gradient is a unique characteristic of lead convection. Though the salinity disturbances may be small when ice velocities are large, the buoyancy flux in leads has a major effect on the boundary layer turbulence. C1 MCPHEE RES,NACHES,WA. OREGON STATE UNIV,COLL OCEANOG,CORVALLIS,OR 97331. OFF NAVAL RES,ARLINGTON,VA 22217. RP MORISON, JH (reprint author), UNIV WASHINGTON,APPL PHYS LAB,CTR POLAR SCI,CODE HN-10,1013 NE 40TH ST,SEATTLE,WA 98195, USA. NR 31 TC 44 Z9 45 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 JUL 15 PY 1992 VL 97 IS C7 BP 11199 EP 11218 DI 10.1029/92JC00684 PG 20 WC Oceanography SC Oceanography GA JE564 UT WOS:A1992JE56400004 ER PT J AU SPIEL, DE AF SPIEL, DE TI ACOUSTICAL MEASUREMENTS OF AIR BUBBLES BURSTING AT A WATER-SURFACE - BURSTING BUBBLES AS HELMHOLTZ RESONATORS SO JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS LA English DT Article ID SIZE; SEA AB Evidence is presented that air bubbles bursting at the surface of water are Helmholtz resonators. The detection by an acoustic transducer of the aerosols generated by the collapsing bubble is also demonstrated. The use of this detector to measure such parameters as bubble collapse time, the number and spacing of the jet drops, their ejection velocities, and their size is discussed. RP SPIEL, DE (reprint author), USN,POSTGRAD SCH,DEPT PHYS,MONTEREY,CA 93943, USA. NR 33 TC 23 Z9 23 U1 0 U2 2 PU AMER GEOPHYSICAL UNION PI WASHINGTON PA 2000 FLORIDA AVE NW, WASHINGTON, DC 20009 SN 0148-0227 J9 J GEOPHYS RES-OCEANS JI J. Geophys. Res.-Oceans PD JUL 15 PY 1992 VL 97 IS C7 BP 11443 EP 11452 DI 10.1029/92JC00982 PG 10 WC Oceanography SC Oceanography GA JE564 UT WOS:A1992JE56400020 ER PT J AU STANLEY, SK KESSLER, SW JUSTEMENT, JS SCHNITTMAN, SM GREENHOUSE, JJ BROWN, CC MUSONGELA, L MUSEY, K KAPITA, B FAUCI, AS AF STANLEY, SK KESSLER, SW JUSTEMENT, JS SCHNITTMAN, SM GREENHOUSE, JJ BROWN, CC MUSONGELA, L MUSEY, K KAPITA, B FAUCI, AS TI CD34+ BONE-MARROW CELLS ARE INFECTED WITH HIV IN A SUBSET OF SEROPOSITIVE INDIVIDUALS SO JOURNAL OF IMMUNOLOGY LA English DT Article ID HUMAN-IMMUNODEFICIENCY-VIRUS; HEMATOPOIETIC PROGENITOR CELLS; AIDS-RELATED COMPLEX; T-CELL; HOMOSEXUAL MEN; HEMATOLOGIC MANIFESTATIONS; HIV-1-INFECTED SUBJECTS; PERIPHERAL-BLOOD; INVITRO; ANTIGEN AB Individuals infected with HIV frequently develop cytopenias and suppressed hematopoiesis. The role of direct HIV infection of hematopoietic progenitor cells in this process has not been defined. In this study, purified CD34+ bone marrow progenitor cells from 74 Zairian and American patients were studied by both coculture viral isolation and polymerase chain reaction for evidence of HIV infection. A total of 36.5% of Zairian and 14% of American patients had HIV infection of the CD34+ cell subset, with as many as 1 in 500 CD34+ cells infected. Most of the Zairian patients in this study had advanced HIV infection and markedly decreased CD4/CD8 T lymphocyte ratios (mean 0.160 +/- 0.08), and no laboratory value predicted the presence of infection in the CD34+ subset of a given Zairian individual. In contrast, American patients with CD34+ cell infection had total CD4 cells <20/mm3 and a greater decrease of the CD4/CD8 T lymphocyte ratio compared to seropositive Americans without CD34+ cell infection (p = 0.003). Hematopoiesis, studied by methylcellulose colony assays, was depressed in all seropositive patients studied with no significant further suppression when CD34+ cells were infected. Thus, CD34+ bone marrow progenitor cells are infected in vivo in a subset of seropositive individuals and may serve as an additional reservoir of virus in HIV-infected individuals. C1 USN,MED RES INST,IMMUNE CELL BIOL PROGRAM,BETHESDA,MD 20889. MAMA YEMO HOSP,KINSHASA,ZAIRE. PROJECT SIDA,KINSHASA,ZAIRE. RP STANLEY, SK (reprint author), NIAID,IMMUNOREGULAT LAB,BLDG 31,ROOM 7A-03,BETHESDA,MD 20892, USA. NR 41 TC 141 Z9 142 U1 0 U2 2 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 1992 VL 149 IS 2 BP 689 EP 697 PG 9 WC Immunology SC Immunology GA JD122 UT WOS:A1992JD12200046 PM 1378076 ER PT J AU AMMAR, GS GRAGG, WB REICHEL, L AF AMMAR, GS GRAGG, WB REICHEL, L TI DOWNDATING OF SZEGO POLYNOMIALS AND DATA-FITTING APPLICATIONS SO LINEAR ALGEBRA AND ITS APPLICATIONS LA English DT Article ID MATRICES AB Many algorithms for polynomial least-squares approximation of a real-valued function on a real interval determine polynomials that are orthogonal with respect to a suitable inner product defined on this interval. Analogously, it is convenient to compute Szego polynomials, i.e., polynomials that are orthogonal with respect to an inner product on the unit circle, when approximating a complex-valued function on the unit circle in the least-squares sense. It may also be appropriate to determine Szego polynomials in algorithms for least-squares approximation of real-valued periodic functions by trigonometric polynomials. This paper is concerned with Szego polynomials that are defined by a discrete inner product on the unit circle. We present a scheme for downdating the Szego polynomials and given least-squares approximant when a node is deleted from the inner product. Our scheme uses the QR algorithm for unitary upper Hessenberg matrices. We describe a data-fitting application that illustrates how our scheme can be combined with the fast-Fourier-transform algorithm when the given nodes are not equidistant. Application to sliding windows is discussed also. C1 USN,POSTGRAD SCH,DEPT MATH,MONTEREY,CA 93940. KENT STATE UNIV,DEPT MATH & COMP SCI,KENT,OH 44242. RP AMMAR, GS (reprint author), NO ILLINOIS UNIV,DEPT MATH SCI,DE KALB,IL 60115, USA. NR 11 TC 15 Z9 15 U1 0 U2 0 PU ELSEVIER SCIENCE INC PI NEW YORK PA 655 AVENUE OF THE AMERICAS, NEW YORK, NY 10010 SN 0024-3795 J9 LINEAR ALGEBRA APPL JI Linear Alg. Appl. PD JUL 15 PY 1992 VL 172 BP 315 EP 336 DI 10.1016/0024-3795(92)90032-6 PG 22 WC Mathematics, Applied; Mathematics SC Mathematics GA JB660 UT WOS:A1992JB66000018 ER PT J AU LIN, HB HUSTON, AL EVERSOLE, JD CAMPILLO, AJ CHYLEK, P AF LIN, HB HUSTON, AL EVERSOLE, JD CAMPILLO, AJ CHYLEK, P TI INTERNAL SCATTERING EFFECTS ON MICRODROPLET RESONANT EMISSION STRUCTURE SO OPTICS LETTERS LA English DT Article ID MORPHOLOGY-DEPENDENT RESONANCES; PARTIAL-WAVE RESONANCES; DIELECTRIC MICROSPHERES; OPTICAL CAVITIES AB The effect of internal scattering on resonant emission structure was studied in 20-mu-m-diameter droplets. Internal scattering was controlled by varying the concentration of 87-nm-diameter polystyrene spheres in a Rhodamine 6G/water/ethanol solution. Results are interpreted in terms of a scattering-induced output coupling enhancement and consequent cavity Q degradation. C1 DALHOUSIE UNIV,DEPT PHYS & OCEANOG,HALIFAX B3H 3J5,NS,CANADA. POTOMAC PHOTON INC,LANHAM,MD 20706. SUNY ALBANY,ATMOSPHER SCI RES CTR,ALBANY,NY 12222. RP LIN, HB (reprint author), USN,RES LAB,CODE 6546,WASHINGTON,DC 20375, USA. NR 12 TC 52 Z9 53 U1 1 U2 4 PU OPTICAL SOC AMER PI WASHINGTON PA 2010 MASSACHUSETTS AVE NW, WASHINGTON, DC 20036 SN 0146-9592 J9 OPT LETT JI Opt. Lett. PD JUL 15 PY 1992 VL 17 IS 14 BP 970 EP 972 DI 10.1364/OL.17.000970 PG 3 WC Optics SC Optics GA JD252 UT WOS:A1992JD25200002 PM 19794690 ER PT J AU WU, L GARLAND, CW PFEIFFER, S AF WU, L GARLAND, CW PFEIFFER, S TI CALORIMETRIC STUDY OF A CLOSED REENTRANT NEMATIC REGION SO PHYSICAL REVIEW A LA English DT Article ID NONASYMPTOTIC CRITICAL-BEHAVIOR; SMECTIC-A TRANSITION; SPIN-GAS MODEL; LIQUID-CRYSTALS; HEAT-CAPACITY; PHASE-TRANSITION; FIELD-THEORY; NEMATIC-SMECTIC-A1; POLYMORPHISM; MIXTURES AB Binary mixtures of 4-n-undecyloxy-(4'-isothiocyanatophenyl)-benzoate (11.O.NCS) and 4-n-decyloxyphenyl-4'-(4"-cyanobenzyloxy)-benzoate (10OPCBOB) exhibit a closed reentrant nematic (N(r)) region-a "nematic lake"-between X=51 and 79, where X is the mole percent of 10OPCBOB. A high-resolution ac calorimetric study has been carried out on six mixtures with this composition range to characterize the smectic-A(d) (Sm-A(d))-N(r) and N(r)-smectic-A1 (Sm-A1) transitions plus one mixture (X=80.7) that undergoes a direct Sm-A(d)-Sm-A1 transition. Of special interest is the N(r)-Sm-A1 transition, which exhibits three-dimensional XY critical heat-capacity behavior at X= 53.8 and 64.5, shows crossover behavior with nonuniversal effective exponents-alpha congruent-to 0.26 for X = 74.5 and alpha congruent-to 0.31 for X= 76.4, and seems to approach tricritical behavior near the entry to the lake. The presence of such a tricritical point is consistent with theoretical predictions of the multicritical topology near a Sm-A(d)-N(r)-Sm-A1 point. C1 MIT,CTR MAT SCI & ENGN,CAMBRIDGE,MA 02139. USN,RES LAB,CTR BIO MOLEC SCI & ENGN,WASHINGTON,DC 20375. RP WU, L (reprint author), MIT,DEPT CHEM,CAMBRIDGE,MA 02139, USA. NR 30 TC 8 Z9 8 U1 1 U2 1 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1050-2947 J9 PHYS REV A JI Phys. Rev. A PD JUL 15 PY 1992 VL 46 IS 2 BP 973 EP 980 DI 10.1103/PhysRevA.46.973 PG 8 WC Optics; Physics, Atomic, Molecular & Chemical SC Optics; Physics GA JF183 UT WOS:A1992JF18300037 ER PT J AU MAGAUD, L VEUILLEN, JY LOLLMAN, D TAN, TAN PAPACONSTANTOPOULOS, DA MEHL, MJ AF MAGAUD, L VEUILLEN, JY LOLLMAN, D TAN, TAN PAPACONSTANTOPOULOS, DA MEHL, MJ TI ELECTRONIC-STRUCTURE OF ERSI2 AND YSI2 SO PHYSICAL REVIEW B LA English DT Article ID SI L2,3VV; 111 SI; SILICIDES; STATES; SPECTROSCOPY; INTERFACE; SILICON; DENSITY; SI(111); GROWTH AB We present a theoretical and experimental study of erbium and yttrium disilicides. These materials are representative of the trivalent heavy-rare-earth disilicides that can be epitaxially grown on Si(111). The densities of states are obtained using the augmented-plane-wave method. They are used to calculate the Auger Si LVV spectra. For the measurements, we used x-ray photoemission and Auger electron spectroscopy on monocrystalline ErSi1.7. Theoretical and experimental results are compared and show structures due to Er-Si hybridization. Although the valence-band results are in qualitative agreement, we find significant differences that could be related to effects due to silicon vacancies. C1 USN,RES LAB,WASHINGTON,DC 20375. RP MAGAUD, L (reprint author), CNRS,ETUD PROPRIETES ELECTR SOLIDES LAB,25 AVE MARTYRS,BOITE POSTALE 166,F-38042 GRENOBLE 09,FRANCE. RI Mehl, Michael/H-8814-2016 NR 28 TC 33 Z9 33 U1 1 U2 5 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD JUL 15 PY 1992 VL 46 IS 3 BP 1299 EP 1304 DI 10.1103/PhysRevB.46.1299 PG 6 WC Physics, Condensed Matter SC Physics GA JE626 UT WOS:A1992JE62600004 ER PT J AU BLAHA, P SINGH, DJ SORANTIN, PI SCHWARZ, K AF BLAHA, P SINGH, DJ SORANTIN, PI SCHWARZ, K TI ELECTRIC-FIELD-GRADIENT CALCULATIONS FOR SYSTEMS WITH LARGE EXTENDED-CORE-STATE CONTRIBUTIONS SO PHYSICAL REVIEW B LA English DT Article ID 1ST-PRINCIPLES CALCULATION; METALS AB Electric-field-gradient (EFG) calculations for TiO2 in the rutile structure using the standard full-potential linearized-augmented-plane-wave (LAPW) method have shown that the contribution of the Ti 3p semicore states is comparable to that of the valence electrons in contrast to other systems studied so far, where the latter dominate. This makes the treatment of the 3p and 4p states of Ti an important issue. Two-energy-window calculations with different Ti p energy linearization parameters or different sphere radii yield drastically different calculated EFG's. The results of standard LAPW calculations are in poor agreement with experiment. An extension of the LAPW basis with local orbitals, however, yields EFG results close to experiment and removes the sensitivity to sphere radii and energy parameters. The large contribution from the semicore states remains and thus must be considered to be real. C1 USN,RES LAB,COMPLEX SYST THEORY BRANCH,WASHINGTON,DC 20375. RP BLAHA, P (reprint author), VIENNA TECH UNIV,INST TECH ELEKTROCHEM,GETREIDEMARKT 9-158,A-1060 VIENNA,AUSTRIA. RI Blaha, Peter/F-2847-2010; Singh, David/I-2416-2012 NR 16 TC 85 Z9 86 U1 0 U2 4 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD JUL 15 PY 1992 VL 46 IS 3 BP 1321 EP 1325 DI 10.1103/PhysRevB.46.1321 PG 5 WC Physics, Condensed Matter SC Physics GA JE626 UT WOS:A1992JE62600007 ER PT J AU CROOKHAM, HC KENNEDY, TA TREACY, DJ AF CROOKHAM, HC KENNEDY, TA TREACY, DJ TI P-31 ELECTRON-NUCLEAR DOUBLE-RESONANCE OF THE P(IN) ANTISITE IN INPZN DETECTED VIA LUMINESCENCE SO PHYSICAL REVIEW B LA English DT Article ID MAGNETIC-RESONANCE; ACCEPTOR AB Optically detected electron-nuclear double resonance (ODENDOR) has been observed via photoluminescence from the first-neighbor P-31 shell of the phosphorus antisite in zinc-doped InP. Analysis of the ENDOR data confirms a tetrahedral arrangement of P-31 nuclei. The hyperfine interaction for each of these nuclei is axial with \A parallel-to\ /h = 368.0 +/- 0.5 MHz and \ A perpendicular-to\ Ih = 247.8 +/- 0.5 MHz. These parameters are slightly different from those reported by Jeon et al. [Phys. Rev. B 36, 1324 (1987)]. A shift of the ENDOR frequencies correlated with a change in the central nuclear-spin state has also been observed. We have been able to account for this shift with a perturbation treatment in which the electronic spin and central nuclear spin are treated exactly and a neighboring nuclear spin provides the perturbation. The best ENDOR signals are obtained with low optical-excitation-power density (approximately 0.1 W/cm2) and low microwave modulation frequency (17 Hz). These conditions emphasize the contributions to the optically detected magnetic-resonance signal from distant donor-acceptor pairs. C1 USN ACAD,ANNAPOLIS,MD 21402. RP CROOKHAM, HC (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 15 TC 5 Z9 5 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD JUL 15 PY 1992 VL 46 IS 3 BP 1377 EP 1381 DI 10.1103/PhysRevB.46.1377 PG 5 WC Physics, Condensed Matter SC Physics GA JE626 UT WOS:A1992JE62600016 ER PT J AU LIMA, ICD REINECKE, TL AF LIMA, ICD REINECKE, TL TI INFRARED-ABSORPTION DUE TO ELECTRON LATTICE-VIBRATION SCATTERING IN ALAS/GAAS QUANTUM-WELLS SO PHYSICAL REVIEW B LA English DT Article ID GAAS-ALAS SUPERLATTICES; FROHLICH INTERACTION; RAMAN-SCATTERING; CONFINED LO; PHONONS; RESONANCE; HETEROSTRUCTURES; SYSTEM; MODES; MASS AB The infrared-absorption coefficient due to interaction of electron's with optical phonons is calculated as a function of frequency for an electron gas in AlAs/GaAs quantum wells. The absorption coefficient is given by the real part of the dynamical conductivity. A finite-temperature force-force correlation-function method is used to represent the Kubo expression for the conductivity. Calculations are made with use of a bulk description for the optical phonons and also by inclusion of the confinement of the phonons for several well widths and several carrier densities. It is found that the effects of the confinement on the phonon spectrum reduce the absorption. The absorption also is found to increase with increasing well width and increasing carrier concentration. C1 USN,RES LAB,WASHINGTON,DC 20375. RP LIMA, ICD (reprint author), INST NACL PESQUISAS ESPACIAIS,ASSOCIADO SENSORES & MAT LAB,BR-12225 SAO JOSE CAMPOS,SP,BRAZIL. NR 28 TC 8 Z9 8 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0163-1829 J9 PHYS REV B JI Phys. Rev. B PD JUL 15 PY 1992 VL 46 IS 3 BP 1620 EP 1627 DI 10.1103/PhysRevB.46.1620 PG 8 WC Physics, Condensed Matter SC Physics GA JE626 UT WOS:A1992JE62600045 ER PT J AU DUNLAP, BI AF DUNLAP, BI TI CONNECTING CARBON TUBULES SO PHYSICAL REVIEW B LA English DT Note AB Two possible joints between different types of carbon tubules are discussed. Both joints introduce a single pentagon-heptagon pair into the perfect hexagon bonding pattern of the two tubules. These two types of joints can be used to form composite tubules in which every carbon atom is threefold coordinated. The first type of joint removes or adds a single hexagon from the circumference of the tubule and the second joins specific "crenelated" and "sawtooth" tubules of significantly different radii at an angle of 30-degrees. RP DUNLAP, BI (reprint author), USN,RES LAB,THEORET CHEM SECT,CODE 6179,WASHINGTON,DC 20375, USA. OI Dunlap, Brett/0000-0003-1356-6559 NR 17 TC 277 Z9 282 U1 1 U2 16 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 1992 VL 46 IS 3 BP 1933 EP 1936 DI 10.1103/PhysRevB.46.1933 PG 4 WC Physics, Condensed Matter SC Physics GA JE626 UT WOS:A1992JE62600098 ER PT J AU BROUGHTON, J AF BROUGHTON, J TI SUPERHEATING OF COATED CLUSTERS SO PHYSICAL REVIEW B LA English DT Article ID SURFACE; CRYSTAL; FILMS; TRANSITION; INTERFACE; ALUMINUM; DYNAMICS; LAYER; MELT; ICE AB We show by simulation that coated clusters can be superheated above their internal pressure-corrected thermodynamic melting points. The work involves molecular-dynamics simulations of Lennard-Jones systems with coatings of differing strength of interaction. Reference is made to full thermodynamic analyses of the one- and two-component phase diagrams. Two mechanisms, depending upon coating thickness, are identified for this enhanced stability. RP BROUGHTON, J (reprint author), USN,RES LAB,COMPLEX SYST THEORY BRANCH,WASHINGTON,DC 20375, USA. NR 30 TC 17 Z9 17 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1098-0121 J9 PHYS REV B JI Phys. Rev. B PD JUL 15 PY 1992 VL 46 IS 4 BP 2523 EP 2531 DI 10.1103/PhysRevB.46.2523 PG 9 WC Physics, Condensed Matter SC Physics GA JE928 UT WOS:A1992JE92800064 ER PT J AU OMAGGIO, JP MEYER, JR WAGNER, RJ HOFFMAN, CA YANG, MJ CHOW, DH MILES, RH AF OMAGGIO, JP MEYER, JR WAGNER, RJ HOFFMAN, CA YANG, MJ CHOW, DH MILES, RH TI DETERMINATION OF BAND-GAP AND EFFECTIVE MASSES IN INAS/GA1-XINXSB SUPERLATTICES SO APPLIED PHYSICS LETTERS LA English DT Article ID INFRARED DETECTORS AB InAs/Ga1-xInxSb superlattices have been investigated by magneto-optical and magnetotransport techniques. Band gaps, determined from interband magneto-optical measurements and from the temperature dependence of the intrinsic carrier concentration, are in the long wavelength infrared region (8.3-12.4-mu-m) and are in good agreement with gaps calculated from a two-band model. Both electron and hole effective masses were measured by cyclotron resonance and the electron effective mass is found to be a factor of 4-5 larger than in HgCdTe (the industry standard IR material). This is necessary for reduced dark currents and good optical absorption coefficients in this material. C1 HUGHES RES LABS,MALIBU,CA 90265. RP OMAGGIO, JP (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 15 TC 31 Z9 32 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 13 PY 1992 VL 61 IS 2 BP 207 EP 209 DI 10.1063/1.108219 PG 3 WC Physics, Applied SC Physics GA JD352 UT WOS:A1992JD35200030 ER PT J AU MELNIK, GA GILBREATH, GC TSAKIRIS, TN JURGILEWICZ, RP OMARA, DM HORSKY, TN WARDE, C AF MELNIK, GA GILBREATH, GC TSAKIRIS, TN JURGILEWICZ, RP OMARA, DM HORSKY, TN WARDE, C TI OPERATING MODES OF A CHARGE-TRANSFER-PLATE LIQUID-CRYSTAL PHASE MODULATOR SO APPLIED OPTICS LA English DT Article; Proceedings Paper CT LAKE TAHOE TOPICAL MEETING ON SPATIAL LIGHT MODULATORS CY 1990 CL LAKE TAHOE, CA AB New results for an electron-beam-addressed liquid-crystal phase modulator are presented. Local, as well as global, control of liquid-crystal molecular reorientation is demonstrated, and the results of five different operating modes are discussed. Linear phase modulation with depths up to 30-pi are demonstrated with this device, as are two-dimensional arrays of computer-generated spherical lenses with actively variable focal lengths. The spherical lenses were written without the use of specialized transfer functions to compensate for device nonlinearities. Applications are discussed in the context of adaptive optics in spaceborne systems. C1 OPTRON SYST INC,BEDFORD,MA 01730. MIT,CAMBRIDGE,MA 02139. RP MELNIK, GA (reprint author), USN,RES LAB,OPT SYST SECT,CODE 8133,WASHINGTON,DC 20375, USA. NR 8 TC 1 Z9 1 U1 0 U2 0 PU OPTICAL SOC AMER PI WASHINGTON PA 2010 MASSACHUSETTS AVE NW, WASHINGTON, DC 20036 SN 0003-6935 J9 APPL OPTICS JI Appl. Optics PD JUL 10 PY 1992 VL 31 IS 20 BP 3892 EP 3897 PG 6 WC Optics SC Optics GA JC656 UT WOS:A1992JC65600004 PM 20725365 ER PT J AU SMITH, BJ WALLIN, JF AF SMITH, BJ WALLIN, JF TI THE EVOLUTIONARY HISTORY OF THE INTERACTING GALAXY SYSTEM NGC-7714/7715 (ARP-284) SO ASTROPHYSICAL JOURNAL LA English DT Article DE CELESTIAL MECHANICS, STELLAR DYNAMICS; GALAXIES, INDIVIDUAL (NGC-7714/7715); GALAXIES, INTERACTIONS; GALAXIES, KINEMATICS AND DYNAMICS; RADIO LINES, ATOMIC ID STAR FORMATION RATES; MERGING GALAXIES; RING GALAXIES; GAS-DYNAMICS; STARBURST GALAXIES; DISK GALAXIES; INFRARED OBSERVATIONS; PECULIAR GALAXIES; NEUTRAL HYDROGEN; SPIRAL GALAXIES AB The VLA D-Array was used to determine the distribution and kinematics of the atomic hydrogen in the interacting galaxy pair NGC 7714/7715 (Arp 284). The H I gas peaks near the center of NGC 7714 and surrounds both optical galaxies, extending to a maximum radius of 6' (approximately 71 kpc) to the southwest. There is an H I bridge between the two galaxies, coincident with the stellar bridge, and an H I tail associated with the long western optical tail of NGC 7715. The velocity field across NGC 7714 shows the classical signature of an inclined rotating disk, with deviations from circular motion near thc ends of the NGC 7714 tails. Using a restricted 3-body dynamical model, we have constructed a likely formation scenario for NGC 7714/7715. The morphology and kinematics of this system are reproduced successfully with a parabolic off-center collision (impact parameter r(min) approximately 0.85 times the radius of the disk) between two unequal-mass disk galaxies (M2/M1 approximately 0.3), where the companion passes through the main galaxy on a retrograde orbit inclined approximately 30-degrees from the perpendicular. From this model, we estimate that the inclination angle for NGC 7714 is approximately 30-degrees, and approximately 1.1 x 10(8) yr have passed since the point of closest approach. The large impact parameter may explain why no star formation is observed in the NGC 7714 ring, in contrast with most ring galaxies; the star formation morphology in NGC 7714 may be governed by bar dynamics rather than by the expanding density wave mechanism thought to occur in more central collisions. For the central starburst in NGC 7714, a comparison of the dynamical mass and the current star formation rate indicates that either the initial mass function (IMF) in NGC 7714 is skewed to high-mass stars or the age of the NGC 7714 starburst is significantly less than the dynamical age of the interaction. If the IMF is similar to that in the solar neighborhood, there has been a time delay between the point of closest approach and the initiation of central star formation, consistent with theoretical models of interaction-triggered nuclear star-bursts. C1 USN,RES LAB,EO HULBURT CTR SPACE RES,WASHINGTON,DC 20375. RP SMITH, BJ (reprint author), UNIV TEXAS,DEPT ASTRON,AUSTIN,TX 78712, USA. NR 99 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 10 PY 1992 VL 393 IS 2 BP 544 EP 558 DI 10.1086/171527 PN 1 PG 15 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA JA516 UT WOS:A1992JA51600013 ER PT J AU FINN, JM GUZDAR, PN CHEN, J AF FINN, JM GUZDAR, PN CHEN, J TI FAST PLASMOID FORMATION IN DOUBLE ARCADES SO ASTROPHYSICAL JOURNAL LA English DT Article DE MHD; SUN, CORONA ID FREE MAGNETIC-FIELDS; SOLAR ERUPTIVE PROCESSES; CORONAL MASS EJECTIONS; INSTABILITY; EQUILIBRIUM; EVOLUTION; ONSET AB The quasi-static evolution of a double arcade system is investigated. It has been proposed (Mikic, Barnes, & Schnack) that a periodic array of arcades in two dimensions can develop an ideal MHD instability when footpoint shear exceeds a critical value. Biskamp & Welter found similar results but argued that the instability is an artifact of the symmetry imposed on the system and that two nonsymmetric neighboring arcades can only develop slow plasmoid formation. We have simulated the evolution of two neighboring nonsymmetric arcades with footpoint shearing profiles which can change in time. In particular, we consider the scenario in which one arcade is sheared more strongly than the other, followed by shearing the other arcade more strongly ("asymmetry switching"). We find that rapid forced reconnection can take place repeatedly, forming a series of plasmoids. In our simulations, we have used "soft walls" by introducing unsheared magnetic field between the arcades and simulation box. This is intended to simulate possible influences of nearby fluxes surrounding magnetized structures in the corona, and we find that it reduces the effects of the simulation box. We find that a two arcade system laterally confined by surrounding fluxes can develop instability with nonsymmetric footpoint shear but that the instability is significantly slower in comparison with the case in which the system is confined by a " hard box " or periodic boundary conditions. The fast plasmoid formation process due to asymmetry switching is not due to the presence of simulation walls. The behavior of double arcades with asymmetry switching is described using equilibrium bifurcation diagrams with footpoint shear and degree of asymmetry, as two independent control parameters. C1 USN,RES LAB,DIV PLASMA PHYS,BEAM PHYS BRANCH,WASHINGTON,DC 20375. SCI APPLICAT INT CORP,MCLEAN,VA. NR 26 TC 20 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 JUL 10 PY 1992 VL 393 IS 2 BP 800 EP 814 DI 10.1086/171547 PN 1 PG 15 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA JA516 UT WOS:A1992JA51600033 ER PT J AU SHIRK, JS LINDLE, JR BARTOLI, FJ BOYLE, ME AF SHIRK, JS LINDLE, JR BARTOLI, FJ BOYLE, ME TI 3RD-ORDER OPTICAL NONLINEARITIES OF BIS(PHTHALOCYANINES) SO JOURNAL OF PHYSICAL CHEMISTRY LA English DT Article ID THIN-FILMS; MOLECULAR SEMICONDUCTORS; MAGNETIC-PROPERTIES; PHTHALOCYANINES; CRYSTALS AB The cubic hyperpolarizabilities, gamma, at 1.064-mu-m are reported for Sc, Y, and several lanthanide bis(phthalocyanines) and their anions. The hyperpolarizabilities varied with the metal ion, increasing as the intervalence transition came closer to resonance. Otherwise gamma varies little with the metal or the charge on the molecule. A two-level model for optical pumping of the intervalence transition does not account for the large observed nonlinearity, but optical pumping may contribute to an observed resonance enhancement of the hypopolarizability in ScPc2. RP SHIRK, JS (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. RI Lindle, James/A-9426-2009 NR 24 TC 123 Z9 123 U1 0 U2 9 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 9 PY 1992 VL 96 IS 14 BP 5847 EP 5852 DI 10.1021/j100193a038 PG 6 WC Chemistry, Physical SC Chemistry GA JD966 UT WOS:A1992JD96600038 ER PT J AU YU, HY SANDAY, SC AF YU, HY SANDAY, SC TI CENTER OF DILATATION AND THERMAL-STRESSES IN AN ELASTIC PLATE SO PROCEEDINGS OF THE ROYAL SOCIETY OF LONDON SERIES A-MATHEMATICAL PHYSICAL AND ENGINEERING SCIENCES LA English DT Article AB The elastic field caused by a centre of dilatation in a plate is given in terms of Galerkin vectors. The field caused by a thermal inhomogeneity is obtained by a method which is based on the integration of properly weighted centres of dilatation over the volume occupied by the plate. The potential functions for the problem solved are the harmonic potential functions of attracting matter filling the element of volume and its mirror images. One of the applications, the thermal elastic stresses due to an expanding (or contracting) inclusion of any shape embedded in the plate, is given as an example. Numerical results for a spherical inclusion with pure dilatation eigenstrain are also presented. RP YU, HY (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 16 TC 12 Z9 13 U1 0 U2 1 PU ROYAL SOC LONDON PI LONDON PA 6 CARLTON HOUSE TERRACE, LONDON, ENGLAND SW1Y 5AG SN 1364-5021 J9 P ROY SOC LOND A MAT JI Proc. R. Soc. London Ser. A-Math. Phys. Eng. Sci. PD JUL 8 PY 1992 VL 438 IS 1902 BP 103 EP 112 DI 10.1098/rspa.1992.0095 PG 10 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA JD905 UT WOS:A1992JD90500006 ER PT J AU DECOSTA, B GEORGE, C DOMINGUEZ, C AF DECOSTA, B GEORGE, C DOMINGUEZ, C TI SYNTHESIS OF ISOTHIOCYANATO-1-[1-(2-BENZO[B]THIENYL)CYCLOHEXYL]PIPERIDINES, POTENTIAL IRREVERSIBLE LIGANDS AT THE DOPAMINE REUPTAKE SITE SO JOURNAL OF THE CHEMICAL SOCIETY-PERKIN TRANSACTIONS 1 LA English DT Article ID RECEPTORS; COCAINE; COMPLEX; BINDING AB Isomeric isothiocyanate derivatives 2-7 of the potent dopamine re-uptake (DA) inhibitor 1-[1-(2-benzo-[b]thienyl)cyclohexyl]piperidine (BTCP 1) have been synthesized as potential irreversible ligands for this site. NaNO2-CF3CO2H provided a mild procedure for mononitration of the benzo[b]thienyl ring of 1 as a route to aryl isothiocyanates 5-7. Novel methodology, utilizing 3,3-ethylene-dioxypentane-1,5-diol dimethanesulfonate ester is described for the synthesis of piperidone 13, a precursor for 4-isothiocyanatopiperidine 2. NaBH4 or LiAlH4 reduction of 4-(2-benzo[b]thienyl)-4-hydroxycyclohexanone 18 and 4-(2-benzo[b]thienyl)-4-(piperidino)cyclohexanone oxime 35 gives the corresponding cis-diol 21 and cis-cyclohexane-1,4-diamine 36 as the major isomers which have been investigated as precursors to the cyclohexane ring isothiocyanates 3 and 4. Alternative routes to 3 and 4 are compared and their stereochemical outcome investigated. C1 USN,RES LAB,WASHINGTON,DC 20375. RP DECOSTA, B (reprint author), NIDDKD,MED CHEM LAB,BETHESDA,MD 20892, USA. NR 22 TC 5 Z9 5 U1 2 U2 2 PU ROYAL SOC CHEMISTRY PI CAMBRIDGE PA THOMAS GRAHAM HOUSE, SCIENCE PARK, MILTON ROAD, CAMBRIDGE, CAMBS, ENGLAND CB4 4WF SN 0300-922X J9 J CHEM SOC PERK T 1 JI J. Chem. Soc.-Perkin Trans. 1 PD JUL 7 PY 1992 IS 13 BP 1671 EP 1680 PG 10 WC Chemistry, Organic SC Chemistry GA JD469 UT WOS:A1992JD46900024 ER PT J AU HOBART, KD GODBEY, DJ THOMPSON, PE AF HOBART, KD GODBEY, DJ THOMPSON, PE TI POSTGROWTH ANNEALING OF LOW TEMPERATURE-GROWN SB-DOPED SI MOLECULAR-BEAM EPITAXIAL-FILMS SO APPLIED PHYSICS LETTERS LA English DT Article ID ELECTRICAL-PROPERTIES; SI(100) FILMS; SILICON; LAYERS; IONS AB Sb-doped Si films have been grown on (100) Si substrates at low temperature (approximately 350-degrees-C) by molecular beam epitaxy. Through coevaporation with Sb, very high doping efficiencies were achieved over a carrier concentration range of 1x10(17) to 1x10(20) cm-3. Through calibration of the beam flux we found that the incorporation of Sb was very near unity up to a concentration of approximately 5x10(19) cm-3. As-grown films are of good quality. However, furnace annealing was shown to improve the mobility and completely activate the Sb. Temperature dependent Hall measurements were used to further characterize the films. RP HOBART, KD (reprint author), USN,RES LAB,DIV ELECTR SCI & TECHNOL,WASHINGTON,DC 20375, USA. NR 19 TC 12 Z9 12 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 6 PY 1992 VL 61 IS 1 BP 76 EP 78 DI 10.1063/1.107618 PG 3 WC Physics, Applied SC Physics GA JB747 UT WOS:A1992JB74700026 ER PT J AU PISTEK, P JOHNSON, DR AF PISTEK, P JOHNSON, DR TI TRANSPORT OF THE NORWEGIAN ATLANTIC CURRENT AS DETERMINED FROM SATELLITE ALTIMETRY SO GEOPHYSICAL RESEARCH LETTERS LA English DT Article ID SURFACE TRANSPORT; GEOSAT ALTIMETER; GULF-STREAM; PROFILES AB Relatively warm and salty North Atlantic surface waters flow through the Faeroe-Shetland Channel into the higher latitudes of the Nordic Seas, preserving an ice-free winter environment for much of the exterior coast of northern Europe. In this study, we have monitored this flow along the Norwegian coast using GEOSAT altimetry on two ascending arcs during the Exact Repeat Mission in 1987-1989. Concurrent undertrack CTD surveys were used to fix a reference surface for the altimeter-derived sea surface height (SSH) anomalies, in effect creating time series of alongtrack surface dynamic height topographics. Climatologic CTD casts were then used, with empirical orthogonal function (EOF) analysis, to derive relationships between historical surface dynamic heights and vertical temperature and salinity profiles. Applying these EOF relationships to the altimeter signals, we calculated mean transports of volume, heat and salt at approximately 2.9 Sverdrups, 8.1 x 10(11) KCal/s and 1.0 X 10(8) Kg/s, respectively. Although strong variability occurred, a clear seasonal signal could be seen with summer to winter variations of about 50% of the means. Maximum transports occurred in February/March and minimum in July/August. RP PISTEK, P (reprint author), USN,RES LAB,BAY ST LOUIS,MS 39529, USA. NR 19 TC 7 Z9 8 U1 1 U2 2 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 JUL 6 PY 1992 VL 19 IS 13 BP 1379 EP 1382 DI 10.1029/92GL01436 PG 4 WC Geosciences, Multidisciplinary SC Geology GA JC596 UT WOS:A1992JC59600015 ER PT J AU STARKWEATHER, HW AVAKIAN, P FONTANELLA, JJ WINTERSGILL, MC AF STARKWEATHER, HW AVAKIAN, P FONTANELLA, JJ WINTERSGILL, MC TI DIELECTRIC RELAXATIONS IN POLY(PERFLUOROPROPYLENE OXIDE) SO MACROMOLECULES LA English DT Note C1 USN ACAD,DEPT PHYS,ANNAPOLIS,MD 21402. RP STARKWEATHER, HW (reprint author), DUPONT CO,CENT RES & DEV EXPTL STN,WILMINGTON,DE 19880, USA. NR 8 TC 1 Z9 1 U1 1 U2 1 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0024-9297 J9 MACROMOLECULES JI Macromolecules PD JUL 6 PY 1992 VL 25 IS 14 BP 3815 EP 3816 DI 10.1021/ma00040a032 PG 2 WC Polymer Science SC Polymer Science GA JD349 UT WOS:A1992JD34900032 ER PT J AU BURNHAM, NA COLTON, RJ POLLOCK, HM AF BURNHAM, NA COLTON, RJ POLLOCK, HM TI WORK-FUNCTION ANISOTROPIES AS AN ORIGIN OF LONG-RANGE SURFACE FORCES SO PHYSICAL REVIEW LETTERS LA English DT Article ID MICROSCOPE; FILMS AB Unusual effects noticed in previous force microscopy data are explained by a model based on work-function anisotropies and their associated patch charges. Measurable forces between macroscopic bodies can be due to the interaction of patch charges, with important consequences in the fields of surface forces, contact mechanics, adhesion, Schottky barriers, and the surface properties of insulators. C1 USN, RES LAB, SURFACE CHEM BRANCH, WASHINGTON, DC 20375 USA. UNIV LANCASTER, SCH PHYS & MAT, LANCASTER LA1 4YB, ENGLAND. RP BURNHAM, NA (reprint author), FORSCHUNGSZENTRUM JULICH, FORSCHUNGSZENTRUM, INST SCHICHT & IONENTECH, W-5170 JULICH 1, GERMANY. RI Burnham, Nancy/A-5210-2013 NR 20 TC 74 Z9 75 U1 0 U2 4 PU AMER 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 6 PY 1992 VL 69 IS 1 BP 144 EP 147 DI 10.1103/PhysRevLett.69.144 PG 4 WC Physics, Multidisciplinary SC Physics GA JC221 UT WOS:A1992JC22100037 ER PT J AU CAPPS, RN STACK, GM SAMUELS, MQ BEUMEL, LL AF CAPPS, RN STACK, GM SAMUELS, MQ BEUMEL, LL TI DIELECTRIC AND VISCOELASTIC PROPERTIES OF SOME META-TETRAMETHYL XYLENE DIISOCYANATE-BASED POLYURETHANES AS A FUNCTION OF SAMPLE COMPOSITION SO JOURNAL OF APPLIED POLYMER SCIENCE LA English DT Article ID SEGMENTED POLYURETHANES; MECHANICAL-PROPERTIES; PHASE-SEPARATION; BLOCK POLYMERS; HARD SEGMENTS; MDI; BEHAVIOR; ELASTOMERS; COPOLYMERS AB A series of linear segmented polyurethanes were synthesized, based on soft segments of polycaprolactone having an average number molecular weight of 2100, or hydroxy-terminated polybutadiene having an approximate molecular weight of 2800. Hard segments were made of meta-tetramethyl xylene diisocyanate and diethyl toluene diamine. The dynamic Young's modulus and loss tangent, relative permittivity, and dielectric loss, were found to be significantly affected by soft segment polarity and hard segment content. These results are discussed in terms of polymer morphology, such as degree of phase separation and soft segment phase state. C1 TRI,TESSCO,ORLANDO,FL 32806. RP CAPPS, RN (reprint author), USN,RES LAB,UNDERWATER SOUND REFERENCE DETACHMENT,POB 568337,ORLANDO,FL 32856, USA. NR 46 TC 1 Z9 1 U1 0 U2 2 PU JOHN WILEY & SONS INC PI NEW YORK PA 605 THIRD AVE, NEW YORK, NY 10158-0012 SN 0021-8995 J9 J APPL POLYM SCI JI J. Appl. Polym. Sci. PD JUL 5 PY 1992 VL 45 IS 7 BP 1175 EP 1188 DI 10.1002/app.1992.070450706 PG 14 WC Polymer Science SC Polymer Science GA HZ097 UT WOS:A1992HZ09700006 ER PT J AU NAKAYAMA, T UEDA, Y YAMADA, H SHORES, EW SINGER, A JUNE, CH AF NAKAYAMA, T UEDA, Y YAMADA, H SHORES, EW SINGER, A JUNE, CH TI INVIVO CALCIUM ELEVATIONS IN THYMOCYTES WITH T-CELL RECEPTORS THAT ARE SPECIFIC FOR SELF LIGANDS SO SCIENCE LA English DT Article ID TRANSGENIC MICE; CD4+8+ THYMOCYTES; ANTIGEN RECEPTOR; TOLERANCE; EXPRESSION; REACTIVITY; SELECTION; PRODUCTS; DELETION; IMMATURE AB Selection of the T cell receptor (TCR) repertoire in the thymus probably involves TCR-mediated signals transduced in developing thymocytes after interaction with thymic stromal cells bearing self ligands. TCR-transduced signals should have identifiable consequences that would distinguish thymocytes whose TCRs have been engaged by self ligands from those whose TCRs have not. Among thymocytes expressing a transgenic TCR of defined specificity, a large number had elevated intracellular calcium concentrations but only when resident in a negatively selecting thymus in which their self ligand was expressed. Thus, developing thymocytes are stimulated by endogenous ligands in vivo to mobilize intracellular calcium, and increased intracellular calcium concentrations may reflect the consequences of intrathymic signaling associated with thymic negative selection. C1 NCI,EXPTL IMMUNOL BRANCH,BLDG 10 ROOM 4B-17,BETHESDA,MD 20892. USN,MED RES INST,IMMUNE CELL BIOL PROGRAM,BETHESDA,MD 20814. RI Nakayama, Toshinori/E-1067-2017 NR 20 TC 65 Z9 66 U1 1 U2 1 PU AMER ASSOC ADVANCEMENT SCIENCE PI WASHINGTON PA 1200 NEW YORK AVE, NW, WASHINGTON, DC 20005 SN 0036-8075 J9 SCIENCE JI Science PD JUL 3 PY 1992 VL 257 IS 5066 BP 96 EP 99 DI 10.1126/science.1621102 PG 4 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA JC165 UT WOS:A1992JC16500039 PM 1621102 ER PT J AU BACKER, D SALLMEN, S FOSTER, R AF BACKER, D SALLMEN, S FOSTER, R TI PULSARS DOUBLE PERIOD CONFIRMED SO NATURE LA English DT Letter C1 USN,RES LAB,WASHINGTON,DC 20375. RP BACKER, D (reprint author), UNIV CALIF BERKELEY,DEPT ASTRON,BERKELEY,CA 94720, USA. NR 8 TC 6 Z9 6 U1 0 U2 0 PU MACMILLAN MAGAZINES LTD PI LONDON PA PORTERS SOUTH, 4 CRINAN ST, LONDON, ENGLAND N1 9XW SN 0028-0836 J9 NATURE JI Nature PD JUL 2 PY 1992 VL 358 IS 6381 BP 24 EP 25 DI 10.1038/358024a0 PG 2 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA JB341 UT WOS:A1992JB34100035 ER PT J AU OREBAUGH, SL HANDY, M AF OREBAUGH, SL HANDY, M TI INTRAVENOUS ADENOSINE THERAPY ACCELERATING RATE OF PAROXYSMAL SUPRAVENTRICULAR TACHYCARDIA SO AMERICAN JOURNAL OF EMERGENCY MEDICINE LA English DT Note DE ADENOSINE; VERAPAMIL; PAROXYSMAL; SUPRAVENTRICULAR TACHYCARDIA; ATRIOVENTRICULAR; CARDIAC RHYTHM; HEMODYNAMIC RP OREBAUGH, SL (reprint author), USN HOSP,DEPT CLIN INVEST,SAN DIEGO,CA 92134, USA. NR 0 TC 5 Z9 5 U1 0 U2 0 PU W B SAUNDERS CO PI PHILADELPHIA PA INDEPENDENCE SQUARE WEST CURTIS CENTER, STE 300, PHILADELPHIA, PA 19106-3399 SN 0735-6757 J9 AM J EMERG MED JI Am. J. Emerg. Med. PD JUL PY 1992 VL 10 IS 4 BP 326 EP 330 DI 10.1016/0735-6757(92)90012-M PG 5 WC Emergency Medicine SC Emergency Medicine GA JB224 UT WOS:A1992JB22400012 PM 1616520 ER PT J AU HOLT, MR AF HOLT, MR TI DRIVE-UP PRESCRIPTION REFILL SERVICE AT A LARGE NAVY MEDICAL FACILITY SO AMERICAN JOURNAL OF HOSPITAL PHARMACY LA English DT Article DE ADMINISTRATION; MANPOWER; MILITARY; PATIENT INFORMATION; PATIENTS; PERSONNEL, PHARMACY; PHARMACEUTICAL SERVICES; PHARMACY, INSTITUTIONAL, HOSPITAL; PRESCRIPTIONS; UNITED-STATES NAVY AB A drive-up prescription refill service at a large naval medical facility is described. A pharmacy drive-up refill service was created to reduce customer congestion, to reduce demand for parking, and to improve customer service. The drive-up program is staffed by a full-time pharmacy technician, a full-time volunteer, and a part-time pharmacy technician who assists during lunches, breaks, and peak hours. Customers must request refills by telephone, and requests are recorded by a pharmacy answering machine. Recorded requests are transcribed, processed, and checked by a pharmacist in the main pharmacy. Refills ready for pickup are transported to the drive-up site twice daily. If a refill is missing, the customer is asked to park, fill out a missing refill form, and pick up the refill at the main pharmacy. Approximately 700 prescription refills are processed and filled daily at the drive-up service. The addition of a drive-up refill service reduced customer visits to the outpatient pharmacy department by about one third and reduced demand for parking by a projected 360-400 parking spaces per day. The error rate for missing refills is less than 0.5%. The only negative consequence of the drive-up service is less interaction between the customer and the pharmacy staff for counseling. A drive-up refill service at a large naval medical facility reduced customer congestion, reduced parking demand, and improved customer service at the outpatient pharmacy department. RP HOLT, MR (reprint author), USN HOSP,PHARM,PORTSMOUTH,VA 23708, USA. NR 0 TC 1 Z9 1 U1 0 U2 0 PU AMER SOC HEALTH-SYSTEM PHARMACISTS PI BETHESDA PA 7272 WISCONSIN AVE, BETHESDA, MD 20814 SN 0002-9289 J9 AM J HOSP PHARM JI Am. J. Hosp. Pharm. PD JUL PY 1992 VL 49 IS 7 BP 1688 EP 1691 PG 4 WC Pharmacology & Pharmacy SC Pharmacology & Pharmacy GA JC010 UT WOS:A1992JC01000017 PM 1621724 ER PT J AU REED, HL DALESANDRO, MM KOWALSKI, KR HOMER, LD AF REED, HL DALESANDRO, MM KOWALSKI, KR HOMER, LD TI MULTIPLE COLD AIR EXPOSURES CHANGE ORAL TRIIODOTHYRONINE KINETICS IN NORMAL MEN SO AMERICAN JOURNAL OF PHYSIOLOGY LA English DT Article DE NONCOMPARTMENTAL; THYROID HORMONES; ADAPTATION ID PROLONGED ANTARCTIC RESIDENCE; THYROID-HORMONES; SEASONAL-VARIATION; THYROXINE; METABOLISM; 3,5,3'-TRIIODOTHYRONINE; THERMOGENESIS; PROPRANOLOL; TIME; TRH AB The influence of cold exposure on triiodothyronine (T3) kinetics was studied in 16 men before, during (biweekly), and after 80 (10/wk) cold (4-degrees-C) air exposures. We used serum values before and up to 24 h after a pharmacological oral (o) dose of T3 [76.8 nmol (50-mu-g)] to calculate noncompartmental kinetic parameters. To assess the role of thyroxine (T4) and thyrotropin (TSH), we administered a replacement dose of T3 [46.0 nmol/day (30-mu-g)] to eight men (+T3 group) and placebo to eight others (-T3 group) for the 2-mo study. There was no group effect of T3 treatment (+T3) on oral total volume of distribution (TVd(o)), metabolic clearance rate (MCR(o)), or disposal rate (DR(o)). TVd(o) was not changed over the study. Cold increased MCR(o) by 5.4 +/- 2.0 l.day-1.m-2. DR(o) increased with cold by 10.2 +/- 4.4 nmol.day-1.m-2. Although serum TSH, total T4, and free T4 decreased by approximately 50% in the +T3 group, the changes in MCR(o) and DR(o) with cold were not different from those in -T3. We describe that human T3 kinetics are changed with brief repeated exposures to cold air and that these increases in MCR(o) and DR(o) do not appear to be dependent on TSH or T4. C1 USN,MED RES INST,THERMAL STRESS ADAPTAT PROGRAM,BETHESDA,MD 20889. UNIFORMED SERV UNIV HLTH SCI,BETHESDA,MD 20814. NR 38 TC 12 Z9 12 U1 0 U2 0 PU AMER PHYSIOLOGICAL SOC PI BETHESDA PA 9650 ROCKVILLE PIKE, BETHESDA, MD 20814 SN 0002-9513 J9 AM J PHYSIOL JI Am. J. Physiol. PD JUL PY 1992 VL 263 IS 1 BP E85 EP E93 PN 1 PG 9 WC Physiology SC Physiology GA JF319 UT WOS:A1992JF31900044 PM 1636702 ER PT J AU GROGL, M THOMASON, TN FRANKE, ED AF GROGL, M THOMASON, TN FRANKE, ED TI DRUG-RESISTANCE IN LEISHMANIASIS - ITS IMPLICATION IN SYSTEMIC CHEMOTHERAPY OF CUTANEOUS AND MUCOCUTANEOUS DISEASE SO AMERICAN JOURNAL OF TROPICAL MEDICINE AND HYGIENE LA English DT Article ID SODIUM STIBOGLUCONATE; MUCOSAL LEISHMANIASIS; ANTIMONIAL DRUGS; INVITRO; EFFICACY AB We report that in vitro sensitivity to pentavalent antimony (Sb5) of 35 Leishmania isolates as determined by the semiautomated microdilution technique (SAMT) showed an 89% and 86% correlation with clinical outcome after Pentostam and Glucantime treatment, respectively. These results suggest that in over 85% of the cases, the clinical outcome of treatment (cure or failure) could have been predicted by using the SAMT technique. Furthermore, the results clearly indicate that drug resistance is a problem, and that at least in some instances, failure to respond to treatment is due to the parasite as well as patient factors. Strains from Sb5-treated patients with American cutaneous and mucocutaneous disease who fail at least one complete course of Pentostam are as highly non-responsive to this drug as laboratory-proven drug-resistant Leishmania strains. It was determined that some Leishmania isolates are innately less susceptible to Sb5 than others, and that moderate resistance to Sb5 exists in nature. A 10- and 17-fold increase was detected in the 50% inhibitory concentration (IC50) of Sb5 for L. mexicana and L. braziliensis isolates after subcurative treatment of the patients, when compared with the mean IC50 of seven and six isolates from the same endemic areas in Guatemala and Peru, respectively. Thus, we have correlated subcurative treatment to a decrease in drug sensitivity in at least these two cases. Collectively, these results indicate that under Sb5 pressure from undermedication, the parasites inherently most drug resistant are favored. The degree of resistance of a strain to antimony in association with host-specific factors will determine whether the clinical response to treatment with this drug is a total cure or a partial response followed by relapse(s), and possibly secondary unresponsiveness resulting in total resistance to antimony. It is evident from our in vitro test data that the SAMT is an extremely powerful and highly accurate technique for the prediction and determination of drug sensitivity of leishmanial isolates, as well as a means to screen for anti-leishmanial agents. C1 USN,MED RES INST DETACHMENT LIMA PERU,APO,MIAMI,FL 34031. RP GROGL, M (reprint author), WALTER REED ARMY MED CTR,DIV EXPTL THERAPEUT,WASHINGTON,DC 20307, USA. RI Villasante, Eileen/G-3602-2011 NR 17 TC 185 Z9 191 U1 0 U2 2 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 JUL PY 1992 VL 47 IS 1 BP 117 EP 126 PG 10 WC Public, Environmental & Occupational Health; Tropical Medicine SC Public, Environmental & Occupational Health; Tropical Medicine GA JF669 UT WOS:A1992JF66900020 PM 1322070 ER PT J AU ZEIGER, MA SWARTZ, SE MACGILLIVRAY, DC LINNOILA, I SHAKIR, M AF ZEIGER, MA SWARTZ, SE MACGILLIVRAY, DC LINNOILA, I SHAKIR, M TI THYMIC CARCINOID IN ASSOCIATION WITH MEN SYNDROMES SO AMERICAN SURGEON LA English DT Article ID MULTIPLE ENDOCRINE ADENOMATOSIS; TUMOR; NEOPLASM AB Although carcinoid tumors in association with multiple endocrine neoplasia syndrome (MEN) has been well described, thymic carcinoid in association with MEN is extremely rare (only 23 cases in the world literature). A patient with thymic carcinoid and MEN-I was treated with surgical resection and postoperative radiation therapy, which was later followed by subtotal parathyroidectomy for hyperparathyroidism. Four years later, a symptomatic recurrence of his thymic carcinoid was resected from below his right clavicle. Six years after his original operation, the patient came to the hospital with pancreatitis, and a 5 cm, distal, pancreatic metastasis was resected. He now has symptomatic paraspinal and pleural metastases and is receiving somatostatin. Review of the world's literature shows that the majority of patients with thymic carcinoid and MEN-I are men with an average age of 37 years. Their clinical course is indolent, and surgery represents the only means of cure. Adjuvant chemotherapy and radiation therapy confer no survival advantage. The surgical decision making involved in treating a patient with thymic carcinoid and hyperparathyroidism associated with MEN is also discussed. C1 USN,NCI,DEPT PATHOL,BETHESDA,MD 20814. NATL NAVY MED CTR,DEPT SURG,BETHESDA,MD. NATL NAVY MED CTR,DEPT ENDOCRINOL,BETHESDA,MD. UNIV CONNECTICUT,CTR HLTH,DEPT SURG,FARMINGTON,CT 06032. RP ZEIGER, MA (reprint author), USN,NCI,SURG BRANCH,BLDG 10,ROOM 2B01,BETHESDA,MD 20892, USA. NR 20 TC 35 Z9 36 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 JUL PY 1992 VL 58 IS 7 BP 430 EP 434 PG 5 WC Surgery SC Surgery GA JB309 UT WOS:A1992JB30900010 PM 1352092 ER PT J AU SCARANO, G BRAMANTI, E ZIRINO, A AF SCARANO, G BRAMANTI, E ZIRINO, A TI DETERMINATION OF COPPER COMPLEXATION IN SEA-WATER BY A LIGAND COMPETITION TECHNIQUE WITH VOLTAMMETRIC MEASUREMENT OF THE LABILE METAL FRACTION SO ANALYTICA CHIMICA ACTA LA English DT Article DE STRIPPING VOLTAMMETRY; COMPLEXATION; COPPER; LIGAND COMPETITION; SEA WATER; SPECIATION; WATERS ID CONDITIONAL STABILITY-CONSTANTS; NATURAL ORGANIC-LIGANDS; ESTUARINE WATERS; STRIPPING VOLTAMMETRY; SEAWATER; SPECIATION; PACIFIC; MEDIA; MODEL; IONS AB A ligand competition-anodic stripping voltammetric (ASV) technique is proposed for investigating copper complexation in sea water. Increasing amounts of ethylenediamine were used to convert the non-reducible copper fraction into a labile copper complex and the change in the stripping peak current was followed. Ligand titration of sea water using this technique indicated that the naturally occurring non-labile copper fraction is bound to ligands having concentrations less than 5 X 10(-9) M and a conditional stability constant (log K(CuL)') of 13.1 +/- 0.3. An advantage of ligand exchange voltammetry is that when applied to raw sea water, it allows the investigation of copper "already" bound by inert ligands. On the other hand, when applied to copper-spiked sea-water samples, this method permits the investigation of the "newly formed" inert complexes. It was found that when copper was added to give [Cu] > 1 X 10(-8) M, the added copper assumed a different inert form than that of the already bound copper in the sample. The combined use of ligand competition-ASV with stripping polarography as a diagnostic method of speciation analysis is discussed. C1 USN, CTR OCEAN SYST, MARINE ENVIRONM BRANCH, SAN DIEGO, CA 92152 USA. RP SCARANO, G (reprint author), IST BIOFIS, CNR, VIA S LORENZO 26, I-56100 PISA, ITALY. RI Bramanti, Emilia/E-1114-2011 OI Bramanti, Emilia/0000-0001-8478-7370 NR 35 TC 40 Z9 40 U1 2 U2 4 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 JUL 1 PY 1992 VL 264 IS 1 BP 153 EP 162 DI 10.1016/0003-2670(92)85311-S PG 10 WC Chemistry, Analytical SC Chemistry GA JB995 UT WOS:A1992JB99500023 ER PT J AU CROWLEY, JP METZGER, JB MERRILL, EW VALERI, CR AF CROWLEY, JP METZGER, JB MERRILL, EW VALERI, CR TI WHOLE-BLOOD VISCOSITY IN BETA-THALASSEMIA MINOR SO ANNALS OF CLINICAL AND LABORATORY SCIENCE LA English DT Article ID ATHEROSCLEROSIS AB Patients with heterozygous beta-thalassemia minor have a decreased hematocrit (HCT). Since the HCT is a primary determinant of whole blood viscosity, the known reduction in HCT in beta-thalassemia minor should lead to a measurable reduction of whole blood viscosity. The influence of the relatively lower mean corpuscular volume and consequent higher red blood cell count and beta-thalassemia minor on whole blood viscosity using a microporous viscometer has not previously been the subject of investigation. Accordingly, the blood of a group of normal and beta-thalassemia minor subjects was examined with a microporous viscometer to elucidate further the relations between whole blood viscosity, HCT, and red blood cell count. The data show that for normal and beta-thalassemia minor subjects a significant positive correlation (r = 0.65, p < 0.01) exists between HCT and whole blood viscosity. However, the slope of the regression of whole blood viscosity and HCT of beta-thalassemia minor subjects was significantly higher z = 3.14, p < 0.001) than that of normals. Thus, for any given HCT their whole blood viscosity was higher than that of normals. Studies of the relation of red blood cell counts to whole blood viscosity indicate the higher whole blood viscosity at a given HCT was related to the increased red blood cell counts in beta-thalassemia minor subjects. Because of the opposing interactions of HCT and red blood cell counts, the mean whole blood viscosity of the group of beta-thalassemia minor subjects examined was not significantly lower than the normal whole blood viscosity. In fact, beta-thalassemia minor subjects with HCT > 42, had a whole blood viscosity significantly higher (p < 0.001) than normals with HCT > 42. C1 BOSTON UNIV,SCH MED,USN,BLOOD RES LAB,BOSTON,MA 02218. MIT,DEPT CHEM ENGN,CAMBRIDGE,MA 02139. RP CROWLEY, JP (reprint author), RHODE ISL HOSP,DEPT MED,593 EDDY ST,PROVIDENCE,RI 02903, USA. FU NHLBI NIH HHS [KO7 HLO1259-01A1] NR 10 TC 3 Z9 3 U1 0 U2 0 PU INST CLINICAL SCIENCE INC PI PHILADELPHIA PA 1833 DELANCEY PLACE, PHILADELPHIA, PA 19103 SN 0091-7370 J9 ANN CLIN LAB SCI JI Ann. Clin. Lab. Sci. PD JUL-AUG PY 1992 VL 22 IS 4 BP 229 EP 235 PG 7 WC Medical Laboratory Technology SC Medical Laboratory Technology GA JC358 UT WOS:A1992JC35800006 PM 1503390 ER PT J AU BABKOFF, H MIKULINCER, M CASPY, T SING, HC AF BABKOFF, H MIKULINCER, M CASPY, T SING, HC TI SELECTED PROBLEMS OF ANALYSIS AND INTERPRETATION OF THE EFFECTS OF SLEEP-DEPRIVATION ON TEMPERATURE AND PERFORMANCE RHYTHMS SO ANNALS OF THE NEW YORK ACADEMY OF SCIENCES LA English DT Article ID CIRCADIAN-RHYTHMS; COGNITIVE PERFORMANCE; WORK; TASK; ACCURACY; TENDENCY; SEARCH; CYCLES; TIME C1 USN,HLTH RES CTR,SAN DIEGO,CA 92138. WALTER REED GEN HOSP,DEPT BEHAV BIOL,WASHINGTON,DC 20307. RP BABKOFF, H (reprint author), BAR ILAN UNIV,DEPT PSYCHOL,RAMAT GAN,ISRAEL. NR 63 TC 3 Z9 6 U1 1 U2 1 PU NEW YORK ACAD SCIENCES PI NEW YORK PA 2 E 63RD ST, NEW YORK, NY 10021 SN 0077-8923 J9 ANN NY ACAD SCI JI Ann. N.Y. Acad. Sci. PD JUL 1 PY 1992 VL 658 BP 93 EP 110 DI 10.1111/j.1749-6632.1992.tb22840.x PG 18 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA JL812 UT WOS:A1992JL81200007 PM 1497265 ER PT J AU KARLE, JM KARLE, IL GERENA, L MILHOUS, WK AF KARLE, JM KARLE, IL GERENA, L MILHOUS, WK TI STEREOCHEMICAL EVALUATION OF THE RELATIVE ACTIVITIES OF THE CINCHONA ALKALOIDS AGAINST PLASMODIUM-FALCIPARUM SO ANTIMICROBIAL AGENTS AND CHEMOTHERAPY LA English DT Article ID CRYSTAL-STRUCTURE; QUINIDINE; INVITRO; QUININE; MALARIA AB Quinine and quinidine were over 100 times more active than 9-epiquinine and 9-epiquinidine against chloroquine-sensitive Plasmodium falciparum and over 10 times more active against chloroquine-resistant P. falciparum. Since the only structural difference between quinine, quinidine, 9-epiquinine, and 9-epiquinidine is their three-dimensional configuration, the three-dimensional structures of these four alkaloids were examined in order to explain the large difference in relative activities between the 9-epi alkaloids and quinine and quinidine. The crystal structure of 9-epiquinidine hydrochloride monohydrate was determined by X-ray diffraction and was compared with the crystal structures of quinine, quinidine sulfate dihydrate, and 9-epiquinine hydrochloride dihydrate. The crystallographic parameters for 9-epiquinidine hydrochloride monohydrate were as follows: chemical formula, C20H25N2O2+ . Cl- . H2O; M(r), 378.9; symmetry of unit cell, orthorhombic; space group, P2(1)2(1)2(1); parameters of unit cell, a was 7.042 +/- 0.001 angstrom (1 angstrom = 0.1 nm), b was 9.082 +/- 0.001 angstrom, c was 31.007 +/- 0.005 angstrom; the volume of unit cell was 1,983.1 +/- 0.6 angstrom3; number of molecules per unit cell was 4; the calculated density was 1.27 g cm-3; the source of radiation was Cu K-alpha (lambda = 1.54178 angstrom); mu (absorption coefficient) was 18.82 cm-1; F(000) (sum of atomic scattering factors at zero scattering angle) was 808; room temperature was used; final R (residual index) was 5.72% for 1,501 reflections with \F(o)\ > 3-sigma (F). The intramolecular distance from N-1 to 0-12 in 9-epiquinidine and 9-epiquinine, although shorter than the corresponding distance in quinine and quinidine, was similar to those of other active amino alcohol antimalarial agents. In all four alkaloids, both the hydroxyl and amine groups formed intermolecular hydrogen bonds, showing the potential for forming hydrogen bonds with cellular constituents. However, the positioning of the N+-1-H-N1 and O-12-H-O12 groups relative to each other was quite different in the 9-epi alkaloids versus quinidine. This difference in positioning may determine the relative strengths of the formation of hydrogen bonds with cellular constituents important to antimalarial activity and, therefore, may determine the relative strength of antimalarial activity. C1 WALTER REED ARMY MED CTR,DEPT PARASITOL,DIV EXPTL THERAPEUT,WASHINGTON,DC 20307. 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 27 TC 54 Z9 55 U1 0 U2 3 PU AMER SOC MICROBIOLOGY PI WASHINGTON PA 1325 MASSACHUSETTS AVENUE, NW, WASHINGTON, DC 20005-4171 SN 0066-4804 J9 ANTIMICROB AGENTS CH JI Antimicrob. Agents Chemother. PD JUL PY 1992 VL 36 IS 7 BP 1538 EP 1544 PG 7 WC Microbiology; Pharmacology & Pharmacy SC Microbiology; Pharmacology & Pharmacy GA JC894 UT WOS:A1992JC89400033 PM 1510452 ER PT J AU HAAS, GA SHIH, A MUELLER, D THOMAS, RE AF HAAS, GA SHIH, A MUELLER, D THOMAS, RE TI ANALYSIS OF OXYGEN BINDING-ENERGY VARIATIONS FOR BAO ON W SO APPLIED SURFACE SCIENCE LA English DT Article ID OVERLAYERS AB Interatomic Auger analyses have been made of different forms of BaO layers on W substrates. Variations in Auger spectroscopy energies of the Ba 4d-Ba 5p-O 2p interatomic Auger transition were found to be largely governed by the O 2p binding energy of the BaO adsorbate. This was illustrated by comparing results of the Auger data values with values derived from O 2p binding energies using ultraviolet photoelectron spectroscopy. Very good agreement was observed not only for the W[100] substrate but also for the W[110] substrate which showed two oxygen-induced electronic states. Variations in binding energy were noted for different states of BaO lattice formation and for different amounts of oxidation, ranging from the transition of Ba to BaO and continuing to the BaO2 stoichiometry and beyond. Effects were also reported for adsorbate alignment and thermal activation (i.e., reduction) of the oxidized state. An empirical relationship was found suggesting that the more tightly bound the O 2p states of the BaO adsorbate were, the lower its work function would be. This link between binding energy and work function was observed to be valid not only for cases of poisoning by oxidation, but held as well during reactivation by the subsequent reduction of the oxide. In addition, this relationship also appeared to predict the low work function obtained through the introduction of substances such as Sc to the BaO-W system. Possible qualitative reasons which might contribute to this are discussed in terms of enhanced dipole effects and shifts in band structure. RP HAAS, GA (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 10 TC 10 Z9 10 U1 0 U2 3 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0169-4332 J9 APPL SURF SCI JI Appl. Surf. Sci. PD JUL PY 1992 VL 59 IS 3-4 BP 227 EP 237 DI 10.1016/0169-4332(92)90122-E PG 11 WC Chemistry, Physical; Materials Science, Coatings & Films; Physics, Applied; Physics, Condensed Matter SC Chemistry; Materials Science; Physics GA JH146 UT WOS:A1992JH14600007 ER PT J AU HARRIS, HC GUETTER, HH PIER, JR ABLES, HD MONET, DG FOLTZ, CB CHAFFEE, FH BOYLE, BJ IRWIN, MJ AF HARRIS, HC GUETTER, HH PIER, JR ABLES, HD MONET, DG FOLTZ, CB CHAFFEE, FH BOYLE, BJ IRWIN, MJ TI A SEARCH FOR QSOS BEHIND GLOBULAR-CLUSTERS SO ASTRONOMICAL JOURNAL LA English DT Article ID RAY LUMINOSITY FUNCTION; RADIO; QUASARS; CANDIDATES; FIELD AB In order to provide a reference frame against which proper motions of stars in globular clusters might be measured, we have searched for QSOs projected behind (primarily) northern globular clusters. Optical, x-ray, and radio techniques were used to select QSO candidates in these relatively crowded fields. Optical photometry, obtained from both CCD images and UK Schmidt Telescope photographic plates, resulted in most of the QSO identifications. Follow-up spectroscopy on the Multiple Mirror Telescope has confirmed fourteen new QSOs and one H II galaxy in the fields of eight clusters. C1 USN OBSERV,FLAGSTAFF,AZ 86002. UNIV ARIZONA,MMT OBSERV,TUCSON,AZ 85721. UNIV CAMBRIDGE,INST ASTRON,CAMBRIDGE CB3 0HA,ENGLAND. ROYAL GREENWICH OBSERV,CAMBRIDGE CB3 0EZ,ENGLAND. NR 31 TC 13 Z9 13 U1 0 U2 0 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0004-6256 J9 ASTRON J JI Astron. J. PD JUL PY 1992 VL 104 IS 1 BP 53 EP 62 DI 10.1086/116220 PG 10 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA JA232 UT WOS:A1992JA23200005 ER PT J AU ARMSTRONG, JT MOZURKEWICH, D VIVEKANAND, M SIMON, RS DENISON, CS JOHNSTON, KJ PAN, XP SHAO, M COLAVITA, MM AF ARMSTRONG, JT MOZURKEWICH, D VIVEKANAND, M SIMON, RS DENISON, CS JOHNSTON, KJ PAN, XP SHAO, M COLAVITA, MM TI THE ORBIT OF ALPHA EQUULEI MEASURED WITH LONG-BASE-LINE OPTICAL INTERFEROMETRY - COMPONENT MASSES, SPECTRAL TYPES, AND EVOLUTIONARY STATE SO ASTRONOMICAL JOURNAL LA English DT Article ID UBVRI PHOTOMETRY; STARS AB We present the orbit of the double-lined spectroscopic binary alpha-Equulei, and masses and absolute magnitudes for its components, from observations with the Mark III Optical Interferometer. Our orbit with the spectroscopic results of Rosvick & Scarfe [MNRAS, 252, 68 (1991)] imply masses and 1-sigma or uncertainties of 2.13 +/- 0.29 M. for the G primary and 1.86 +/- 0.21 M. for the A secondary. The magnitude differences that we measure at the four observed wavelengths are consistent with a G5 III primary and an A5 V secondary, with an uncertainty of about 1.5 subtypes. We compare the masses, magnitude differences, and absolute magnitudes determined here with the evolutionary models of VandenBerg [ApJS, 58, 711 (1985)] and infer that the metallicity Z=Z.. The masses of the G and A components from the orbital fit agree with the evolutionary masses (2.36-2.75 M. and 2.01-2.14 M., respectively) that fit their derived colors and absolute magnitudes. The best-fit age from the evolutionary model is 0.5-0.65 Gyr. The parallax of the system obtained from combining the spectroscopic and interferometric data, for which the term "orbital parallax" has been suggested, is given by pi(orb)=0".01808+/-0".00076. C1 USN OBSERV, OPT INTERFEROMETER PROJECT, NRL, WASHINGTON, DC 20390 USA. CALTECH, DEPT ASTRON, PASADENA, CA 91125 USA. JET PROP LAB, PASADENA, CA 91109 USA. NR 33 TC 41 Z9 41 U1 0 U2 0 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 JUL PY 1992 VL 104 IS 1 BP 241 EP 252 DI 10.1086/116236 PG 12 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA JA232 UT WOS:A1992JA23200021 ER PT J AU KRICHBAUM, TP WITZEL, A GRAHAM, DA ALEF, W PAULINYTOTH, IIK HUMMEL, CA QUIRRENBACH, A INOUE, M HIRABAYASHI, H MORIMOTO, M ROGERS, AEE ZENSUS, JA LAWRENCE, CR READHEAD, ACS BOOTH, RS RONNANG, BO KUS, AJ JOHNSTON, KJ SPENCER, JH BURKE, BF DHAWAN, V BARTEL, N SHAPIRO, II ALBERDI, A MARCAIDE, JM AF KRICHBAUM, TP WITZEL, A GRAHAM, DA ALEF, W PAULINYTOTH, IIK HUMMEL, CA QUIRRENBACH, A INOUE, M HIRABAYASHI, H MORIMOTO, M ROGERS, AEE ZENSUS, JA LAWRENCE, CR READHEAD, ACS BOOTH, RS RONNANG, BO KUS, AJ JOHNSTON, KJ SPENCER, JH BURKE, BF DHAWAN, V BARTEL, N SHAPIRO, II ALBERDI, A MARCAIDE, JM TI THE EVOLUTION OF THE SUB-PARSEC STRUCTURE OF 3C 84 AT 43 GHZ SO ASTRONOMY & ASTROPHYSICS LA English DT Article DE GALAXIES, ACTIVE; GALAXIES, SEYFERT-GALAXIES, 3C 84; GALAXIES, JETS OF; IMAGE PROCESSING; INTERFEROMETRY ID COMPACT RADIO-SOURCES; LONG BASELINE INTERFEROMETRY; ACTIVE GALAXY NGC-1275; VLBI OBSERVATIONS; ANGULAR RESOLUTION; RELATIVISTIC JETS; PERSEUS-A; NUCLEUS; WAVELENGTH; ACCRETION AB We present 43 GHz VLBI observations of the peculiar Seyfert-like radiogalaxy 3C 84 (NGC 1275), with an angular resolution of approximately 0.1 mas, corresponding to an intrinsic linear scale of approximately 30 light-days (H0 = 100 km s-1 Mpc-1, q0 = 0.5). The inclusion of reanalyzed data-sets from earlier 43 GHz VLBI observations has enabled us to make new images with high spatial resolution of the core region of 3C 84 and to attribute the previously found subluminal expansion to subluminal motion (beta(app) = 0.1-0.2) of several components in a northern milliarcsecond-jet. A surrounding halo-like structure is apparently contracting with a rate of approximately 0.14 mas yr-1 (beta(app) approximately -0.12). We further find evidence for existing faint emission embedded in the extended southern lobe region, predominating at longer wavelengths. Our data suggest the occurrence of motion in this region with typical velocities of beta(app) almost-equal-to 0.5, in good agreement with earlier results obtained at 22 GHz. The combination with 22 GHz data yields evidence for motion along a curved path - inclined by 60-90-degrees against the northern mass-jet - for the southern component S2. The possible spatial curvature of the jet in 3C 84 and its implications for the jet-to-counterjet ratio are discussed. C1 NOBEYAMA RADIO OBSERV, NOBEYAMA, JAPAN. HAYSTACK OBSERV, NEROC, WESTFORD, MA USA. NATL RADIO ASTRON OBSERV, SOCORRO, NM 87801 USA. CALTECH, PASADENA, CA 91125 USA. ONSALA SPACE OBSERV, ONSALA, SWEDEN. USN, RES LAB, WASHINGTON, DC 20375 USA. MIT, CAMBRIDGE, MA 02139 USA. HARVARD SMITHSONIAN CTR ASTROPHYS, CAMBRIDGE, MA 02138 USA. INST ASTROFIS ANDALUCIA, GRANADA, SPAIN. RP KRICHBAUM, TP (reprint author), MAX PLANCK INST RADIOASTRON, HUGEL 69, W-5300 BONN 1, GERMANY. NR 66 TC 34 Z9 34 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 1992 VL 260 IS 1-2 BP 33 EP 48 PG 16 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA JE834 UT WOS:A1992JE83400007 ER PT J AU FELDMAN, U MANDELBAUM, P SEELY, JF DOSCHEK, GA GURSKY, H AF FELDMAN, U MANDELBAUM, P SEELY, JF DOSCHEK, GA GURSKY, H TI THE POTENTIAL FOR PLASMA DIAGNOSTICS FROM STELLAR EXTREME-ULTRAVIOLET OBSERVATIONS SO ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES LA English DT Article DE INSTRUMENTATION, SPECTROGRAPHS; ULTRAVIOLET, SOLAR SYSTEM ID EMISSION-LINES; SOLAR; FLARE AB Based on 20 years of solar investigations, the extreme-ultraviolet (EUV) spectrum in the range 50-500 angstrom has proved to be extraordinarily rich in providing information on the density, temperature. and element abundances of the plasma in the Sun's chromosphere and corona, especially when observed with high spectral resolution. With the advent of new instruments using multilayer optics and CCD detectors, similar measurements with a spectral resolution of about 10,000 become possible on large numbers of nearby stars, in contrast with lower resolution instruments now scheduled for space flight. In this paper we provide a description of the lines from the most abundant ions in this spectral region that have special diagnostic significance. These lines are from plasmas in the temperature range from 10(5) to 10(7) K. We demonstrate their utility for determining temperature, density, and abundances. We also describe an objective grating spectrometer, based on the Naval Research Laboratory Skylab slitless spectrograph, for making celestial observations in the EUV spectral region with high spectral resolution. C1 HEBREW UNIV JERUSALEM,RACAH INST,IL-91904 JERUSALEM,ISRAEL. RP FELDMAN, U (reprint author), USN,RES LAB,EO HULBURT CTR SPACE RES,WASHINGTON,DC 20375, USA. NR 39 TC 218 Z9 218 U1 1 U2 2 PU UNIV CHICAGO PRESS PI CHICAGO PA 5720 S WOODLAWN AVE, CHICAGO, IL 60637 SN 0067-0049 J9 ASTROPHYS J SUPPL S JI Astrophys. J. Suppl. Ser. PD JUL PY 1992 VL 81 IS 1 BP 387 EP & DI 10.1086/191698 PG 0 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA HZ731 UT WOS:A1992HZ73100016 ER PT J AU YACAVONE, DW BASON, R AF YACAVONE, DW BASON, R TI CERVICAL INJURIES DURING HIGH G-MANEUVERS - A REVIEW OF NAVAL SAFETY CENTER DATA, 1980-1990 SO AVIATION SPACE AND ENVIRONMENTAL MEDICINE LA English DT Article AB As aircraft capable of sustaining high "G" maneuvers enter the U.S. Navy Fleet, the reported incidence of cervical injury to aircrew seems to have increased. To determine the extent of the problem, personal injury reports submitted to the Naval Safety Center were reviewed for the 10-year period from 1980 to 1990. In addition, confidential questionnaires were sent to flight surgeons supporting fighter/or fighter-attack units. The data collected were statistically analyzed. The incidence of cervical injuries, defined as at least one day's absence from the flight schedule, was computed. Other subjective factors, such as the type helmet worn, the cockpit position flown and the type of mission profile completed, were examined. As might be expected, the most common offender was air combat maneuvering. The most common aircraft was the F/Al 8, but the radar intercept officer position in the F14B was also a significant contributor. The most common injury pattern reported was a simple muscle strain. Cervical pain after high "G" missions poses a potential threat to combat readiness. However, the use of the newer light-weight helmet seems to have reduced the severity. Muscle strengthening exercises appear to help in prevention. Treatment is successful in most cases with minimal or no residuals noted. As yet, there exist little official data to support the notion of a major problem. RP YACAVONE, DW (reprint author), USN,DIV AEROMED,NAVAL SAFETY CTR,NAVAL AIR STN,NORFOLK,VA 23511, USA. NR 4 TC 20 Z9 21 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 JUL PY 1992 VL 63 IS 7 BP 602 EP 605 PG 4 WC Public, Environmental & Occupational Health; Medicine, General & Internal; Sport Sciences SC Public, Environmental & Occupational Health; General & Internal Medicine; Sport Sciences GA JA489 UT WOS:A1992JA48900008 PM 1616436 ER PT J AU HACKNEY, AC HODGDON, JA AF HACKNEY, AC HODGDON, JA TI THYROID-HORMONE CHANGES DURING MILITARY FIELD OPERATIONS - EFFECTS OF COLD-EXPOSURE IN THE ARCTIC SO AVIATION SPACE AND ENVIRONMENTAL MEDICINE LA English DT Article ID PROLONGED PHYSICAL STRAIN; SLEEP-DEPRIVATION; EXERCISE; ADAPTATION; TRIIODOTHYRONINE; IODOTHYRONINES; TESTOSTERONE; METABOLISM; RESPONSES; PROLACTIN AB This study examined the effect of prolonged physical activity in a cold environment upon circulating thyroid hormone levels. A secondary focus of the study involved the role of nocturnal habitat upon the thyroidal responses to the physical activity and cold exposure. Military personnel exposed to 10 d of field-based operations in the arctic region of Norway were studied. Blood samples were collected before (day 1), and at days 5 and 10 of the operations. Levels of total T4, free T4, total T3, free T3, and thyroid binding globulin were assessed in all blood samples. The results indicated considerable, significant (p < .05) decreases in total thyroid hormone levels, while relative increases of free fractions of the hormones occur with the 10-d operations in the Arctic. However, no significant influence on thyroidal responses were observed due to the nocturnal habitat that the subjects lived in. The hormonal alterations noted are possibly brought about by the combined effects of physical activity and cold exposure acting synergistically to alter thyroid physiology (e.g., most likely the protein carrier binding affinity). C1 USN,RES CTR,DEPT WORK PHYSIOL,SAN DIEGO,CA 92132. RP HACKNEY, AC (reprint author), UNIV N CAROLINA,DEPT PHYS EDUC EXERCISE & SPORT SCI,APPL PHYSIOL LAB,CB 8700,FETZER BLDG,CHAPEL HILL,NC 27599, USA. RI HACKNEY, ANTHONY/D-9521-2013 NR 24 TC 10 Z9 10 U1 0 U2 1 PU AEROSPACE MEDICAL ASSOC PI ALEXANDRIA PA 320 S HENRY ST, ALEXANDRIA, VA 22314-3579 SN 0095-6562 J9 AVIAT SPACE ENVIR MD JI Aviat. Space Environ. Med. PD JUL PY 1992 VL 63 IS 7 BP 606 EP 611 PG 6 WC Public, Environmental & Occupational Health; Medicine, General & Internal; Sport Sciences SC Public, Environmental & Occupational Health; General & Internal Medicine; Sport Sciences GA JA489 UT WOS:A1992JA48900009 PM 1616437 ER PT J AU SHANNON, K AF SHANNON, K TI GENETIC ALTERATIONS IN LEUKEMIA - EVENTS ON A GRAND SCALE SO BLOOD LA English DT Editorial Material ID ACUTE LYMPHOBLASTIC-LEUKEMIA C1 UNIV CALIF SAN FRANCISCO,SAN FRANCISCO,CA 94143. RP SHANNON, K (reprint author), USN HOSP,DEPT PEDIATR,8750 MT BLVD,OAKLAND,CA 94627, USA. NR 9 TC 3 Z9 3 U1 0 U2 0 PU W B SAUNDERS CO PI PHILADELPHIA PA INDEPENDENCE SQUARE WEST CURTIS CENTER, STE 300, PHILADELPHIA, PA 19106-3399 SN 0006-4971 J9 BLOOD JI Blood PD JUL 1 PY 1992 VL 80 IS 1 BP 1 EP 2 PG 2 WC Hematology SC Hematology GA JB280 UT WOS:A1992JB28000001 PM 1611078 ER PT J AU SMITH, SD ANDERSON, RJ OOST, WA KRAAN, C MAAT, N DECOSMO, J KATSAROS, KB DAVIDSON, KL BUMKE, K HASSE, L CHADWICK, HM AF SMITH, SD ANDERSON, RJ OOST, WA KRAAN, C MAAT, N DECOSMO, J KATSAROS, KB DAVIDSON, KL BUMKE, K HASSE, L CHADWICK, HM TI SEA-SURFACE WIND STRESS AND DRAG COEFFICIENTS - THE HEXOS RESULTS SO BOUNDARY-LAYER METEOROLOGY LA English DT Article ID ATMOSPHERIC-TURBULENCE MEASUREMENTS; INERTIAL-DISSIPATION METHOD; INDUCED FLOW DISTORTION; HEAT-FLUX; PRESSURE ANEMOMETER; HUMIDITY EXCHANGE; AIR; WAVES; OCEAN; DEPENDENCE AB Turbulent fluxes have been measured in the atmospheric surface layer from a boom extending upwind from the Dutch offshore research platform Meetpost Noordwijk (MPN) during HEXMAX (Humidity Exchange over the Sea Main Experiment) in October-November, 1986. We started out to study eddy flux of water vapour, but discrepancies among simultaneous measurements made with three different anemometers led us to develop methods to correct eddy correlation measurements of wind stress for flow distortion by nearby objects. We then found excellent agreement among the corrected wind stress data sets from the three anemometers on the MPN boom and with eddy correlation measurements from a mast on a tripod. Inertial-dissipation techniques gave reliable estimates of wind stress from turbulence spectra, both at MPN and at a nearby ship. The data cover a range of wave ages and the results yield new insights into the variation of sea surface wind stress with sea state; two alternative formulas are given for the nondimensional surface roughness as a function of wave age. C1 ROYAL NETHERLANDS METEOROL INST,3730 AE DE BILT,NETHERLANDS. UNIV WASHINGTON,DEPT ATMOSPHER SCI,SEATTLE,WA 98195. USN,POSTGRAD SCH,DEPT METEOROL,MONTEREY,CA 93943. UNIV KIEL,INST MEERESKUNDE,W-2300 KIEL 1,GERMANY. METEOROL OFF,BRACKNELL RB12 2SZ,BERKS,ENGLAND. RP SMITH, SD (reprint author), FISHERIES & OCEANS CANADA,BEDFORD INST OCEANOG,DEPT FISHERIES & OCEANS,POB 1006,DARTMOUTH B2Y 4A2,NS,CANADA. NR 62 TC 257 Z9 275 U1 1 U2 16 PU KLUWER ACADEMIC PUBL PI DORDRECHT PA SPUIBOULEVARD 50, PO BOX 17, 3300 AA DORDRECHT, NETHERLANDS SN 0006-8314 J9 BOUND-LAY METEOROL JI Bound.-Layer Meteor. PD JUL PY 1992 VL 60 IS 1-2 BP 109 EP 142 DI 10.1007/BF00122064 PG 34 WC Meteorology & Atmospheric Sciences SC Meteorology & Atmospheric Sciences GA JF297 UT WOS:A1992JF29700006 ER PT J AU PEAK, JE TAG, PM AF PEAK, JE TAG, PM TI TOWARD AUTOMATED INTERPRETATION OF SATELLITE IMAGERY FOR NAVY SHIPBOARD APPLICATIONS SO BULLETIN OF THE AMERICAN METEOROLOGICAL SOCIETY LA English DT Article AB The U.S. Navy has plans to develop an automated system to analyze satellite imagery aboard its ships at sea. Lack of time for training, in combination with frequent personnel rotations, precludes the building of extensive imagery interpretation expertise by shipboard personnel. A preliminary design starts from pixel data from which clouds are classified. An image segmentation is performed to assemble and isolate cloud groups, which are then identified (e.g., as a cold front) using neural networks. A combination of neural networks and expert systems is subsequently used to transform key information about the identified cloud patterns as inputs to an expert system that provides sensible weather information, the ultimate objective of the imagery analysis. C1 USN,RES LAB,MONTEREY,CA 93940. RP PEAK, JE (reprint author), COMP SCI CORP,MONTEREY,CA, USA. NR 23 TC 18 Z9 19 U1 0 U2 1 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 1992 VL 73 IS 7 BP 995 EP 1008 DI 10.1175/1520-0477(1992)073<0995:TAIOSI>2.0.CO;2 PG 14 WC Meteorology & Atmospheric Sciences SC Meteorology & Atmospheric Sciences GA JE291 UT WOS:A1992JE29100005 ER PT J AU OHSAKI, Y GAZDAR, AF CHEN, HC JOHNSON, BE AF OHSAKI, Y GAZDAR, AF CHEN, HC JOHNSON, BE TI ANTITUMOR-ACTIVITY OF MAGAININ ANALOGS AGAINST HUMAN LUNG-CANCER CELL-LINES SO CANCER RESEARCH LA English DT Article ID ANTIMICROBIAL ACTIVITY; PEPTIDES; SURVIVAL; CARCINOMA; GROWTH; SKIN AB Magainin 1 and magainin 2, originally isolated from African clawed frog Xenopus laevis skin, inhibit the growth of bacteria and fungi. Synthetic magainin A (MAG A) and magainin G (MAG G) are more potent against bacteria and protozoa. In order to determine the antitumor activity of these analogues, we have tested these two analogues against six small cell lung cancer (SCLC) cell lines NCI-H82, NCI-H526, NCI-H678, NCI-H735, NCI-H841, and NCI-H889, which were known to differ by more than 10-fold in their sensitivity to different chemotherapeutic agents, and four normal human fibroblast cell lines. Semiautomated 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide assays of the six SCLC cell lines revealed average concentrations producing 50% inhibition (IC50) values of 2.6-mu-M (range, 0.49-9.30-mu-M) for cisplatin, 2.5-mu-M (range, 0.39-6.00-mu-M) for etoposide, and 138.8 nM (range, 55.0-450.0 nM) for doxorubicin. The average IC50 of MAG A was 8.64-mu-M (range, 6.23-11.7-mu-M) and that of MAG G was 8.82-mu-M (range, 4.44-12.5-mu-M) against the SCLC cell lines. Despite a 10-fold difference in sensitivity to standard chemotherapeutic agents, the IC50 of MAG A and MAG G differs by <3-fold. The average IC50 against four normal human fibroblast cell lines was 21.1-mu-M (range, 12.7-25.6-mu-M) for MAG A and 29.2-mu-M (range, 21.3-34.8-mu-M) for MAG G. Combined exposure to the IC50 concentration of MAG A or MAG G plus IC50 of etoposide or cisplatin decreased the percentage of surviving SCLC cells to 29.0% (range, 26.1-31.7%). MAG A or MAG G had an additive effect when used with standard chemotherapeutic agents. These data suggest that MAG A and MAG G have in vitro antitumor activity against SCLC cell lines. C1 NCI,NATL NAVAL MED CTR,USN,MED ONCOL BRANCH,BLDG 8,RM 5101,BETHESDA,MD 20889. NICHHD,ENDOCRINOL & REPROD RES BRANCH,BETHESDA,MD 20892. NR 22 TC 121 Z9 128 U1 0 U2 10 PU AMER ASSOC CANCER RESEARCH PI PHILADELPHIA PA PUBLIC LEDGER BLDG, SUITE 816, 150 S. INDEPENDENCE MALL W., PHILADELPHIA, PA 19106 SN 0008-5472 J9 CANCER RES JI Cancer Res. PD JUL 1 PY 1992 VL 52 IS 13 BP 3534 EP 3538 PG 5 WC Oncology SC Oncology GA JA764 UT WOS:A1992JA76400004 PM 1319823 ER PT J AU HENDERSHOT, DG PAZIK, JC BERRY, AD AF HENDERSHOT, DG PAZIK, JC BERRY, AD TI SYNTHESIS, CHARACTERIZATION, AND CHEMICAL VAPOR-DEPOSITION PROPERTIES OF PRIMARY AND SECONDARY NEOPENTYLSTIBINE - NEW ANTIMONY PRECURSORS FOR MOCVD SO CHEMISTRY OF MATERIALS LA English DT Article ID MOLECULAR-BEAM EPITAXY; PHASE EPITAXY; INSB; GROWTH; GAAS; INAS1-XSBX; TERTIARYBUTYLARSINE; BUTYLPHOSPHINE; SUPERLATTICES; INP AB The primary and secondary neopentylstibines (neopentyl = Me3CCH2-) have been synthesized by the reduction of the corresponding dihalo- and monohaloantimony compounds, respectively. Neopentylstibine was prepared by the reduction of (Me3CCH2)SbBr2 with lithium aluminum hydride (LAH). The primary stibine is highly air-sensitive and exhibits a vapor pressure of 5.5 Torr at 0-degrees-C. Dineopentylstibine was synthesized by LAH reduction of (Me3CCH2)2SbI. The secondary stibine is less sensitive to air than its primary congener but nonetheless decomposes when exposed to air. Dineopentylstibine is substantially less volatile than (Me3CCH2)SbH2, exhibiting a vapor pressure of 0.5 Torr at 24 C. The detailed synthesis, spectroscopic characterizations, physical properties, and preliminary chemical vapor deposition experiments of these hydridic antimony compounds is described. RP HENDERSHOT, DG (reprint author), USN,RES LAB,MAT CHEM BRANCH,CODE 6120,WASHINGTON,DC 20375, USA. NR 34 TC 17 Z9 17 U1 0 U2 2 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0897-4756 J9 CHEM MATER JI Chem. Mat. PD JUL-AUG PY 1992 VL 4 IS 4 BP 833 EP 837 DI 10.1021/cm00022a017 PG 5 WC Chemistry, Physical; Materials Science, Multidisciplinary SC Chemistry; Materials Science GA JG698 UT WOS:A1992JG69800017 ER PT J AU WELBOURN, R GOLDMAN, G KOBZIK, L PATERSON, IS VALERI, CR SHEPRO, D HECHTMAN, HB AF WELBOURN, R GOLDMAN, G KOBZIK, L PATERSON, IS VALERI, CR SHEPRO, D HECHTMAN, HB TI ROLE OF NEUTROPHIL ADHERENCE RECEPTORS (CD-18) IN LUNG PERMEABILITY FOLLOWING LOWER TORSO ISCHEMIA SO CIRCULATION RESEARCH LA English DT Article DE NEUTROPENIA; NEUTROPHIL SEQUESTRATION; ENDOTHELIUM ID INTERCELLULAR-ADHESION MOLECULE-1; MONOCLONAL-ANTIBODY; LIMB ISCHEMIA; CELL-SURFACE; VASCULAR-PERMEABILITY; GRANULOCYTE DEPLETION; REPERFUSION INJURY; XANTHINE-OXIDASE; SKELETAL-MUSCLE; SHEEP LUNG AB Ischemia and reperfusion of the lower torso lead to leukotriene- and neutrophil (PMN)-dependent lung injury characterized by lung PMN sequestration, increased permeability, and noncardiogenic edema. It is thought that PMNs require adhesion to endothelium to alter barrier function. This study tests the role of CD 18, the PMN adherence receptor, in mediating lung permeability after lower torso ischemia and reperfusion. Anesthetized rabbits (n=9) underwent 3 hours of bilateral hind limb ischemia. Ten minutes after the release of the tourniquets, plasma leukotriene B4 levels increased to 395+/-85 pg/ml, higher than 129+/-35 pg/ml in controls (n=9,p<0.01). At this time there was a reduction in circulating white blood cells (x 10(3)), 3.56+/-0.49/mm3 relative to 6.07+/-0.61/mm3 in controls (p<0.01). PMNs were sequestered in the hind limbs, indicated by increased myeloperoxidase activity of 1.06+/-0.19 units/g compared with 0.56+/-0.09 units/g in controls (p<0.05). Four hours after tourniquet release, PMNs were sequestered in the lungs, 52+/-4 PMNs per 10 high-power fields, a value higher than 31.5+/-3 PMNs per 10 high-power fields in controls; bronchoalveolar lavage fluid protein content increased to 554+/-90 mu-g/ml relative to 277+/-46 mu-g/ml in controls; and there was lung edema, measured by increased wet weight-to-dry weight ratios of 5.19+/-0.10, higher than 4.29+/-0.21 in controls (all p<0.01). The wet/dry ratios of the heart, liver, and kidney were unchanged. Pretreatment of other rabbits (n=8) with a purified anti-CD 18 monoclonal antibody (R 15.7, 1 mg/kg) 10 minutes before tourniquet release did not affect the rise in leukotriene B4 but was effective in preventing leukopenia (7.29+/-1.05/mm3, p<0.01) and sequestration of PMNs in the hind limbs (myeloperoxidase activity, 0.46+/-0.12 units/g, p<0.05). Further, the anti-CD 18 monoclonal antibody prevented lung sequestration of PMNs (34+/-3 PMNs per 10 high-power fields, p<0.01) and reduced permeability, shown by a fall in bronchoalveolar lavage fluid protein to 324+/-41-mu-g/ml and a fall in wet/dry weight ratio to 4.61+/-0.10 (both p<0.05). These data suggest that CD 18 is important in PMN-dependent lung injury after remote ischemia. C1 BRIGHAM & WOMENS HOSP,DEPT SURG,75 FRANCIS ST,BOSTON,MA 02115. BRIGHAM & WOMENS HOSP,DEPT PATHOL,BOSTON,MA 02115. HARVARD UNIV,SCH MED,BOSTON,MA 02115. BIOL SCI CTR,BOSTON,MA. BOSTON UNIV,USN,BLOOD RES LAB,BOSTON,MA 02215. FU NHLBI NIH HHS [HL-16714-13]; NIGMS NIH HHS [GM-35141-04, GM-24891-11] NR 41 TC 45 Z9 48 U1 0 U2 0 PU AMER HEART ASSOC PI DALLAS PA 7272 GREENVILLE AVENUE, DALLAS, TX 75231-4596 SN 0009-7330 J9 CIRC RES JI Circ.Res. PD JUL PY 1992 VL 71 IS 1 BP 82 EP 86 PG 5 WC Cardiac & Cardiovascular Systems; Hematology; Peripheral Vascular Disease SC Cardiovascular System & Cardiology; Hematology GA HZ760 UT WOS:A1992HZ76000011 PM 1351425 ER PT J AU CULHAM, P AF CULHAM, P TI STRUCTURE AND SCALE IN THE ROMAN ECONOMY - DUNCANJONES,R 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 ASSOC ATLANTIC STATE PI PITTSBURGH PA DUQUESNE UNIV DEPT CLASSICS, PITTSBURGH, PA 15282 SN 0009-8418 J9 CLASSICAL WORLD JI Class. World PD JUL-AUG PY 1992 VL 85 IS 6 BP 745 EP 746 DI 10.2307/4351181 PG 2 WC Classics SC Classics GA JQ244 UT WOS:A1992JQ24400053 ER PT J AU DAVIS, DC SYKLAWER, R COLE, RL AF DAVIS, DC SYKLAWER, R COLE, RL TI MELORHEOSTOSIS ON 3-PHASE BONE-SCINTIGRAPHY - CASE-REPORT SO CLINICAL NUCLEAR MEDICINE LA English DT Article ID SCAN AB Melorheostosis is a benign sclerosing bone dysplasia with a very unusual and characteristic roentgenographic appearance. Its scintigraphic appearance also is characteristic, with asymmetric cortical activity that may cross joints to involve contiguous bones. The authors report the appearance of melorheostosis on angiogram and blood pool phases of three-phase bone scintigraphy. C1 USN HOSP,DEPT RADIOL,DIV NUCL MED,SAN DIEGO,CA 92134. RP DAVIS, DC (reprint author), USN HOSP,DEPT CLIN INVEST,SAN DIEGO,CA 92134, USA. NR 12 TC 13 Z9 14 U1 0 U2 0 PU LIPPINCOTT-RAVEN PUBL PI PHILADELPHIA PA 227 EAST WASHINGTON SQ, PHILADELPHIA, PA 19106 SN 0363-9762 J9 CLIN NUCL MED JI Clin. Nucl. Med. PD JUL PY 1992 VL 17 IS 7 BP 561 EP 564 DI 10.1097/00003072-199207000-00006 PG 4 WC Radiology, Nuclear Medicine & Medical Imaging SC Radiology, Nuclear Medicine & Medical Imaging GA JC505 UT WOS:A1992JC50500006 PM 1638837 ER PT J AU OCONNOR, JM ELLINGWOOD, BR AF OCONNOR, JM ELLINGWOOD, BR TI SITE-DEPENDENT MODELS OF EARTHQUAKE GROUND MOTION SO EARTHQUAKE ENGINEERING & STRUCTURAL DYNAMICS LA English DT Article ID SPECTRA; CALIFORNIA; PARAMETERS AB Random vibration analyses of structural systems subjected to seismic loading are dependent upon the characterization of earthquake ground motion as a stochastic process. The response of structural systems to earthquakes is dependent strongly on the local geological conditions, which should be incorporated into seismological models of ground motion. In the study presented herein, three previously developed ground-motion models are adapted to incorporate site-dependent characteristics. Records obtained from two recording stations in California are used as a basis for the ground-motion models. Single-degree-of-freedom (SDOF) oscillators are subjected to ensembles of accelerograms generated from these models, and both elastic and inelastic response are considered. Response statistics are compared to those generated by the analysis of structural response to ensembles of recorded motion from the two sites. The important features of the ground motion for effective reproduction of response statistics are identified, and observations are made on the sensitivity of specific response parameters to site-dependent characteristics of the ground motion. C1 JOHNS HOPKINS UNIV,DEPT CIVIL ENGN,BALTIMORE,MD 21218. RP OCONNOR, JM (reprint author), USN,CTR AIR TEST,PATUXENT RIVER,MD 20670, USA. NR 25 TC 3 Z9 3 U1 0 U2 0 PU JOHN WILEY & SONS LTD PI W SUSSEX PA BAFFINS LANE CHICHESTER, W SUSSEX, ENGLAND PO19 1UD SN 0098-8847 J9 EARTHQUAKE ENG STRUC JI Earthq. Eng. Struct. Dyn. PD JUL PY 1992 VL 21 IS 7 BP 573 EP 589 DI 10.1002/eqe.4290210702 PG 17 WC Engineering, Civil; Engineering, Geological SC Engineering GA JD104 UT WOS:A1992JD10400002 ER PT J AU KWON, YW AF KWON, YW TI ANALYSIS OF CRACK CLOSURE IN UNIDIRECTIONAL COMPOSITE PLATES SUBJECT TO BENDING LOADS SO ENGINEERING FRACTURE MECHANICS LA English DT Article ID FINITE-ELEMENT ANALYSIS AB Finite element analyses were performed to investigate the effect of crack closure in unidirectional fibrous composite plates with through-wall-thickness cracks and subjected to bending loads. The analyses showed that, for a composite plate, crack closure at the compression side of a through-wall-thickness crack increased the crack opening displacement and bending stress around the crack tip at the tensile surface of the plate. This was due to the effect of transverse shear. Thus, not considering crack closure in a composite plate subject to a bending load will result in a not only inaccurate but also non-conservative solution for a through-wall-thickness crack. RP KWON, YW (reprint author), USN,POSTGRAD SCH,DEPT MECH ENGN,MONTEREY,CA 93943, USA. NR 13 TC 1 Z9 1 U1 0 U2 0 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0013-7944 J9 ENG FRACT MECH JI Eng. Fract. Mech. PD JUL PY 1992 VL 42 IS 5 BP 825 EP 831 DI 10.1016/0013-7944(92)90063-K PG 7 WC Mechanics SC Mechanics GA JF206 UT WOS:A1992JF20600010 ER PT J AU STANG, PM LEE, RF SELIGMAN, PF AF STANG, PM LEE, RF SELIGMAN, PF TI EVIDENCE FOR RAPID, NONBIOLOGICAL DEGRADATION OF TRIBUTYLTIN COMPOUNDS IN AUTOCLAVED AND HEAT-TREATED FINE-GRAINED SEDIMENTS SO ENVIRONMENTAL SCIENCE & TECHNOLOGY LA English DT Article ID GAS-CHROMATOGRAPHIC DETERMINATION; SAN-DIEGO BAY; ORGANOTIN COMPOUNDS; CHEMICAL-REACTIONS; CLAY SURFACES; DIBUTYLTIN; SAMPLES; WATERS AB Sterilized sediments, high in silt and clay content, from various sites in the United States rapidly degraded added C-14-labeled tributyltin (TBTX) or unlabeled TBTX to dibutyltin (DBTX2), monobutyltin (MBTX3), and inorganic tin. This degradation was primarily abiotic, as documented by similar degradation rates between sterilized and nonsterilized sediment. Degradation occurred in two phases, with a rapid degradation phase (23-94%) after 2 days, followed by slower degradation rates of the remaining TBTX during the next 5-7 days. DBTX2 in the primary degradation product found when TBTX is added to marine water, with very little production of MBTX3. For our sediment studies, as well as those of others, the primary degradation product when dissolved TBTX is added to fine-grained sediment was MBTX3. MBTX3 is formed in the sediment and, because of its hydrophilic nature, enters the water shortly after its formation. We suggest that production of MBTX3 by bottom sediments is why the ratios of MBTX3/TBTX were significantly higher in bottom water than surface water in a San Diego Bay marina. C1 COMP SCI CORP, DIV APPL TECHNOL, SAN DIEGO, CA 92110 USA. SKIDAWAY INST OCEANOG, SAVANNAH, GA 31416 USA. USN, CTR OCEAN SYST, DIV ENVIRONM CTR, SAN DIEGO, CA 92152 USA. NR 25 TC 37 Z9 39 U1 0 U2 4 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0013-936X EI 1520-5851 J9 ENVIRON SCI TECHNOL JI Environ. Sci. Technol. PD JUL PY 1992 VL 26 IS 7 BP 1382 EP 1387 DI 10.1021/es00031a016 PG 6 WC Engineering, Environmental; Environmental Sciences SC Engineering; Environmental Sciences & Ecology GA JA725 UT WOS:A1992JA72500021 ER PT J AU MONROY, RL GANEY, JT DAVIS, TA PERRIN, PJ ZSEBO, K STEAD, R AF MONROY, RL GANEY, JT DAVIS, TA PERRIN, PJ ZSEBO, K STEAD, R TI ENHANCEMENT OF HEMATOPOIETIC RECOVERY USING RECOMBINANT HUMAN STEM-CELL FACTOR (SCF) AFTER HIGH-DOSE CHEMOTHERAPY IN NONHUMAN-PRIMATES SO EXPERIMENTAL HEMATOLOGY LA English DT Meeting Abstract C1 USN,MED RES INST,BETHESDA,MD 20814. AMGEN INC,THOUSAND OAKS,CA. NR 0 TC 1 Z9 1 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 1992 VL 20 IS 6 BP 768 EP 768 PG 1 WC Hematology; Medicine, Research & Experimental SC Hematology; Research & Experimental Medicine GA JA734 UT WOS:A1992JA73400243 ER PT J AU SCHWARTZ, GN KESSLER, SW AF SCHWARTZ, GN KESSLER, SW TI STEM-CELL GROWTH-FACTOR (SCF) ENHANCED INTERLEUKIN-3-INDUCED MYELOPOIESIS IN SERUM-DEPRIVED LIQUID CULTURES OF CD34+ HUMAN MARROW-CELLS SO EXPERIMENTAL HEMATOLOGY LA English DT Meeting Abstract C1 WALTER REED ARMY MED CTR,WASHINGTON,DC 20307. 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 1992 VL 20 IS 6 BP 803 EP 803 PG 1 WC Hematology; Medicine, Research & Experimental SC Hematology; Research & Experimental Medicine GA JA734 UT WOS:A1992JA73400378 ER PT J AU MARTO, PJ AF MARTO, PJ TI FILM CONDENSATION HEAT-TRANSFER MEASUREMENTS ON HORIZONTAL TUBES - PROBLEMS AND PROGRESS SO EXPERIMENTAL THERMAL AND FLUID SCIENCE LA English DT Review DE FILM CONDENSATION; HORIZONTAL TUBES; FINNED TUBES; WILSON PLOT; LOCAL MEASUREMENTS ID INTEGRAL-FIN TUBES; STEAM AB This paper reviews the problems that are likely to be encountered in measuring the film condensation heat transfer coefficient on horizontal tubes and the progress that has been made in obtaining accurate experimental values. Direct methods using wall temperature measurements and indirect methods such as the Wilson plot technique are compared. The particular difficulties and uncertainties associated with measurements on integral-fin tubes are described, including recent efforts to deduce the local heat transfer coefficient distribution around the tube circumference. RP MARTO, PJ (reprint author), USN,POSTGRAD SCH,DEPT MECH ENGN,MONTEREY,CA 93943, USA. NR 37 TC 3 Z9 3 U1 1 U2 7 PU ELSEVIER SCIENCE INC PI NEW YORK PA 655 AVENUE OF THE AMERICAS, NEW YORK, NY 10010 SN 0894-1777 J9 EXP THERM FLUID SCI JI Exp. Therm. Fluid Sci. PD JUL PY 1992 VL 5 IS 4 BP 556 EP 569 DI 10.1016/0894-1777(92)90042-4 PG 14 WC Thermodynamics; Engineering, Mechanical; Physics, Fluids & Plasmas SC Thermodynamics; Engineering; Physics GA JB642 UT WOS:A1992JB64200015 ER PT J AU CUNNINGHAM, DS HANSEN, KA CODDINGTON, CC AF CUNNINGHAM, DS HANSEN, KA CODDINGTON, CC TI CHANGES IN T-CELL REGULATION OF RESPONSES TO SELF ANTIGENS IN WOMEN WITH PELVIC ENDOMETRIOSIS SO FERTILITY AND STERILITY LA English DT Article; Proceedings Paper CT 47TH ANNUAL MEETING OF THE AMERICAN FERTILITY SOC CY OCT 21-24, 1991 CL ORLANDO, FL SP AMER FERTIL SOC DE ENDOMETRIOSIS; AUTOIMMUNITY; IMMUNOLOGICAL TOLERANCE; T-CELL REGULATION ID IMMUNOLOGICAL ASPECTS; PATHOGENESIS AB Objective: To study autoimmune aspects of endometriosis.(~)Design: Lymphoblast transformation and hemolytic plaque formation were used to assess specific T- and B-cell activity against endometrial antigens. Setting: Military teaching hospital. Patients: Ninety-four healthy women of reproductive age undergoing diagnostic laparoscopy as part of an evaluation for infertility or chronic pelvalgia were accordingly grouped into those with normal pelvic peritoneum (20), mild endometriosis (50), and severe endometriosis (24). Main Outcome Measure: The study assessed the proliferative and humoral responses of lymphocytes from women with and without endometriosis to endometrial antigens and quantified the number of B-cell precursors, T-helper cells, and T-suppressor cells to these antigens. Results: Unfractionated endometrial antigens were similarly blastogenic for lymphocytes from women with and without endometriosis. Despite equivalent numbers of B-cell precursors to these antigens, antiendometrial antibody responsiveness appears to have increased in women with mild endometriosis because of a decrease in T-suppressor cell activity and declined in women with severe endometriosis because of a further drop in T-suppressor cell activity and an increase in T-helper cell activity, as compared with women without endometriosis. Conclusions: Taken together, these experiments support the possibility that pelvic endometriosis may result from a break in specific T-cell tolerance rather than nonspecific polyclonal activation of responder lymphocytes. C1 USN HOSP,DEPT OBSTET & GYNECOL,DIV REPROD ENDOCRINOL,PORTSMOUTH,VA. EASTERN VIRGINIA MED SCH,DEPT OBSTET & GYNECOL,NORFOLK,VA 23501. NR 25 TC 19 Z9 19 U1 0 U2 2 PU AMER SOC REPRODUCTIVE MEDICINE PI BIRMINGHAM PA 1209 MONTGOMERY HIGHWAY, BIRMINGHAM, AL 35216-2809 SN 0015-0282 J9 FERTIL STERIL JI Fertil. Steril. PD JUL PY 1992 VL 58 IS 1 BP 114 EP 119 PG 6 WC Obstetrics & Gynecology; Reproductive Biology SC Obstetrics & Gynecology; Reproductive Biology GA JB470 UT WOS:A1992JB47000019 PM 1385582 ER PT J AU PASCU, D PANOSSIAN, SP SCHMIDT, RE SEIDELMANN, PK HERSHEY, JL AF PASCU, D PANOSSIAN, SP SCHMIDT, RE SEIDELMANN, PK HERSHEY, JL TI B, V PHOTOMETRY OF THEBE (JXIV) SO ICARUS LA English DT Article ID GROUND-BASED OBSERVATIONS; GALILEAN SATELLITES; CCD OBSERVATIONS; RING C1 COMP SCI CORP,STSCI,BALTIMORE,MD 21218. RP PASCU, D (reprint author), USN OBSERV,WASHINGTON,DC 20392, USA. NR 25 TC 6 Z9 6 U1 0 U2 0 PU ACADEMIC PRESS INC JNL-COMP SUBSCRIPTIONS PI SAN DIEGO PA 525 B ST, STE 1900, SAN DIEGO, CA 92101-4495 SN 0019-1035 J9 ICARUS JI Icarus PD JUL PY 1992 VL 98 IS 1 BP 38 EP 42 DI 10.1016/0019-1035(92)90204-K PG 5 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA JF951 UT WOS:A1992JF95100004 ER PT J AU KAMGARPARSI, B ROSENBLUM, LJ BELCHER, EO AF KAMGARPARSI, B ROSENBLUM, LJ BELCHER, EO TI UNDERWATER ACOUSTIC IMAGING SO IEEE COMPUTER GRAPHICS AND APPLICATIONS LA English DT Article C1 UNIV WASHINGTON,APPL PHYS LAB,SEATTLE,WA 98195. RP KAMGARPARSI, B (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 4 TC 0 Z9 0 U1 0 U2 0 PU IEEE COMPUTER SOC PI LOS ALAMITOS PA 10662 LOS VAQUEROS CIRCLE, PO BOX 3014, LOS ALAMITOS, CA 90720-1264 SN 0272-1716 J9 IEEE COMPUT GRAPH JI IEEE Comput. Graph. Appl. PD JUL PY 1992 VL 12 IS 4 BP 11 EP 13 PG 3 WC Computer Science, Software Engineering SC Computer Science GA JD228 UT WOS:A1992JD22800005 ER PT J AU ROSENBLUM, LJ BROWN, BE AF ROSENBLUM, LJ BROWN, BE TI GUEST EDITORS INTRODUCTION - VISUALIZATION SO IEEE COMPUTER GRAPHICS AND APPLICATIONS LA English DT Editorial Material C1 ORACLE CORP,MULTIMEDIA STRATEG BUSINESS UNIT,REDWOOD SHORES,CA 94065. RP ROSENBLUM, LJ (reprint author), USN,RES LAB,SIGNAL PROC BRANCH,CODE 5127,WASHINGTON,DC 20375, USA. NR 2 TC 6 Z9 6 U1 0 U2 0 PU IEEE COMPUTER SOC PI LOS ALAMITOS PA 10662 LOS VAQUEROS CIRCLE, PO BOX 3014, LOS ALAMITOS, CA 90720-1264 SN 0272-1716 J9 IEEE COMPUT GRAPH JI IEEE Comput. Graph. Appl. PD JUL PY 1992 VL 12 IS 4 BP 18 EP 20 PG 3 WC Computer Science, Software Engineering SC Computer Science GA JD228 UT WOS:A1992JD22800008 ER PT J AU TATTERSALL, JM KING, PC MINGRONE, JA HERSTEIN, PD AF TATTERSALL, JM KING, PC MINGRONE, JA HERSTEIN, PD TI THE ACOUSTIC TRANSIENT RECORDING BUOY (ATRB) - SYSTEM DESCRIPTION AND INITIAL MEASUREMENT RESULTS SO IEEE JOURNAL OF OCEANIC ENGINEERING LA English DT Article DE AUTONOMOUS ACOUSTIC RECORDING BUOY; DIGITAL VCR RECORDER; BROAD-BAND ACOUSTIC MULTIPATH; EXPLOSIVE ACOUSTIC SOURCES ID SEA-SURFACE; SOUND AB Autonomous acoustic recording buoys (AARB's) are recoverable systems deployed from surface ships for remote collection of underwater acoustic data. These systems have been used for more than 25 years to obtain measurements of a wide range of acoustic phenomena such as surface scatter, multipath spreading, ambient noise, and sea floor interaction. Previous systems have been limited in dynamic range and data recording capacity. A new system, the acoustic transient recording buoy (ATRB) has been developed to provide improved dynamic range and recording capacity in a reconfigurable manner. In particular, this digital system can acquire and record up to 16 hours of broadband wide dynamic range (almost-equal-to 80 dB) acoustic data from eight hydrophones. A unique feature of the ATRB system is the use of two inexpensive video cassette recorders to obtain up to 10 Gb of data storage capacity. The system is self-contained and is capable of unattended bottom moored operation. An experiment was designed and conducted with a single ship and this system to obtain simultaneous measurements of sea surface forward scatter, propagation loss and sea floor interaction. Data obtained demonstrate the utility of this system for ocean acoustic experiments. Explosive charge source levels using direct path measurements were found to agree with previous measurements. Surface reflected data were found to exhibit a frequency dependence attributed to sea surface swell and roughness. C1 C&M TECHNOL INC,OLD SAYBROOK,CT 06547. RP TATTERSALL, JM (reprint author), USN,CTR UNDERWATER SYST,NEW LONDON,CT 06320, USA. NR 19 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 0364-9059 J9 IEEE J OCEANIC ENG JI IEEE J. Ocean. Eng. PD JUL PY 1992 VL 17 IS 3 BP 227 EP 238 DI 10.1109/48.153440 PG 12 WC Engineering, Civil; Engineering, Ocean; Engineering, Electrical & Electronic; Oceanography SC Engineering; Oceanography GA JH080 UT WOS:A1992JH08000001 ER PT J AU SCHEPS, R MYERS, JF AF SCHEPS, R MYERS, JF TI LASER DIODE-PUMPED INTERNALLY FOLDED ND-YAG LASER SO IEEE JOURNAL OF QUANTUM ELECTRONICS LA English DT Letter AB A diode-pumped Nd: YAG laser is described in which the gain element is fabricated in the shape of an isosceles right angle prism. An orthogonal face forms the highly reflective end of the resonator while the hypotenuse serves as an internal fold mirror. Scaling was demonstrated by pumping the gain element along three axes simultaneously. The maximum power obtained was 1.3 W at 1.06-mu-m and 128 mW at 532 nm. Repetitive Q-switched operation is also reported. RP SCHEPS, R (reprint author), USN,CTR OCEAN SYST,CODE 843,SAN DIEGO,CA 92152, USA. NR 13 TC 4 Z9 4 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 JUL PY 1992 VL 28 IS 7 BP 1640 EP 1642 DI 10.1109/3.142549 PG 3 WC Engineering, Electrical & Electronic; Optics; Physics, Applied SC Engineering; Optics; Physics GA HY362 UT WOS:A1992HY36200004 ER PT J AU BETHEL, RE RAHIKKA, RG AF BETHEL, RE RAHIKKA, RG TI MULTISIGNAL TIME-DELAY DETECTION AND TRACKING SO IEEE TRANSACTIONS ON AEROSPACE AND ELECTRONIC SYSTEMS LA English DT Article AB An optimum solution to the time delay detection and tracking problem has been previously achieved. The approach used is applicable to many problems. The difficulty with this solution is that it is capable of detecting and tracking only a single signal. In many problems, there is potentially more than one signal present in the observed data. The number of signals present and estimates of the associated signal parameters are required. The same approach used in the single signal case is extended to the multisignal case, with time delay as the selected problem. C1 USN,CTR SURFACE WARFARE,DEPT UNDERWATER SYST,ACOUST SIGNAL PROC BRANCH,SILVER SPRING,MD 20903. RP BETHEL, RE (reprint author), PLANNING SYST INC,7923 JONES BRANCH DR,MCLEAN,VA 22102, USA. NR 24 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 0018-9251 J9 IEEE T AERO ELEC SYS JI IEEE Trans. Aerosp. Electron. Syst. PD JUL PY 1992 VL 28 IS 3 BP 675 EP 696 DI 10.1109/7.256290 PG 22 WC Engineering, Aerospace; Engineering, Electrical & Electronic; Telecommunications SC Engineering; Telecommunications GA JM710 UT WOS:A1992JM71000007 ER PT J AU GERLACH, K AF GERLACH, K TI THE EFFECT OF I,Q MISMATCH ERRORS ON ADAPTIVE CANCELLATION SO IEEE TRANSACTIONS ON AEROSPACE AND ELECTRONIC SYSTEMS LA English DT Article AB The effects of I and Q phase, amplitude, and low pass filter (LPF) errors on adaptive cancelers are investigated. I,Q errors occur because of errors in the synthesis process of the mixers and LPFs designed to be identical for each input channel. These I,Q errors among the channels result in cancellation degradation. Tapped delay line transversal filters have been proposed as a way to compensate for these errors and thus improve cancellation performance. However, it is shown that if there is any LPF mismatch, then transversal filtering has a small effect on improving canceler performance. The method of individual I,Q adaptive transversal filter weighting is suggested as a means of completely eliminating the phase, amplitude errors, and making the canceler performance responsive to transversal filter compensation. RP GERLACH, K (reprint author), USN,RES LAB,DIV RADAR,CODE 5341,WASHINGTON,DC 20375, USA. NR 5 TC 6 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 0018-9251 J9 IEEE T AERO ELEC SYS JI IEEE Trans. Aerosp. Electron. Syst. PD JUL PY 1992 VL 28 IS 3 BP 729 EP 740 DI 10.1109/7.256294 PG 12 WC Engineering, Aerospace; Engineering, Electrical & Electronic; Telecommunications SC Engineering; Telecommunications GA JM710 UT WOS:A1992JM71000011 ER PT J AU COLLINS, JB UHLMANN, JK AF COLLINS, JB UHLMANN, JK TI EFFICIENT GATING IN DATA ASSOCIATION WITH MULTIVARIATE GAUSSIAN DISTRIBUTED STATES SO IEEE TRANSACTIONS ON AEROSPACE AND ELECTRONIC SYSTEMS LA English DT Letter AB We describe an efficient algorithm for evaluating the (weighted bipartite graph of) associations between two sets of data with Gaussian error, e.g., between a set of measured state vectors and a set of estimated state vectors. First a general method is developed for determining, from the covariance matrix, d-dimensional error ellipsoids for the state vectors which always overlap when a gating criterion is satisfied. Circumscribing boxes, or d-ranges, for the data ellipsoids are then found and whenever they overlap the association probability is computed. For efficiently determining the intersections of the d-ranges a multidimensional search tree method is used to reduce the overall scaling of the evaluation of associations. Very few associations that lie outside the predetermined error threshold or gate are evaluated. The search method developed is a fixed "Mahalanobis distance" search. Empirical testing for variously distributed data in both three and eight dimensions indicate that the scaling is significantly reduced from N2, where N is the size of the data set. Computational loads for many large scale (N > 10 - 100) data association tasks may therefore be significantly reduced by this or related methods. RP COLLINS, JB (reprint author), USN,RES LAB,CODE 5571,WASHINGTON,DC 20375, USA. NR 6 TC 36 Z9 37 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 1992 VL 28 IS 3 BP 909 EP 916 DI 10.1109/7.256316 PG 8 WC Engineering, Aerospace; Engineering, Electrical & Electronic; Telecommunications SC Engineering; Telecommunications GA JM710 UT WOS:A1992JM71000033 ER PT J AU BARRIOS, AE AF BARRIOS, AE TI PARABOLIC EQUATION MODELING IN HORIZONTALLY INHOMOGENEOUS ENVIRONMENTS SO IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION LA English DT Article ID FOURIER-TRANSFORM; PROPAGATION AB A parabolic equation (PE) model has been developed for use in tropospheric radiowave propagation. A simple technique to model range-dependent environments has been implemented. Results from the model are compared with experimental data at 170, 520, 3240, 3300, and 9875 MHz in measured range-dependent environments. The experimental data are taken from two separate experiments performed during 1947 and 1948. Measurements were made on overwater paths from Guadalupe Island to San Diego, CA, in one experiment, and the other was located in the South Island of New Zealand, also known as the Canterbury Project. The results are presented as one-way propagation factor in decibels versus height. The technique used here to model range-dependent environments is shown to give a reasonably good estimate of the environment between measurements, leading to excellent agreement between the predicted fields and observed radio data. RP BARRIOS, AE (reprint author), USN,CTR COMMAND CONTROL & OCEAN SURVEILLANCE,SAN DIEGO,CA 92152, USA. NR 26 TC 63 Z9 66 U1 1 U2 1 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0018-926X J9 IEEE T ANTENN PROPAG JI IEEE Trans. Antennas Propag. PD JUL PY 1992 VL 40 IS 7 BP 791 EP 797 DI 10.1109/8.155744 PG 7 WC Engineering, Electrical & Electronic; Telecommunications SC Engineering; Telecommunications GA JJ722 UT WOS:A1992JJ72200007 ER PT J AU BEEX, AA FARGUES, MP AF BEEX, AA FARGUES, MP TI ANALYSIS OF CLOCK JITTER IN SWITCHED-CAPACITOR SYSTEMS SO IEEE TRANSACTIONS ON CIRCUITS AND SYSTEMS I-FUNDAMENTAL THEORY AND APPLICATIONS LA English DT Article ID CIRCUITS AB The effect of periodic clock jitter in switched capacitor filters is analyzed extending a previously introduced state-space approach. This procedure facilitates the evaluation of the effects of internally generated noise sources upon the output spectral density. As such, one can then evaluate the sensitivity of a specific structure to its switched capacitor and operational amplifier noise sources. The application of our results to a switched capacitor integrator shows that the output noise level may be very sensitive to the jitter amplitude, and points out the need for high precision clock circuitry to minimize the effects of internally generated noise on the switched capacitor filter output. C1 USN,POSTGRAD SCH,DEPT ELECT & COMP ENGN,MONTEREY,CA 93943. RP BEEX, AA (reprint author), VIRGINIA POLYTECH INST & STATE UNIV,BRADLEY DEPT ELECT ENGN,BLACKSBURG,VA 24061, USA. NR 14 TC 3 Z9 3 U1 0 U2 0 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 1057-7122 J9 IEEE T CIRCUITS-I JI IEEE Trans. Circuits Syst. I-Fundam. Theor. Appl. PD JUL PY 1992 VL 39 IS 7 BP 506 EP 519 DI 10.1109/81.257284 PG 14 WC Engineering, Electrical & Electronic SC Engineering GA JQ750 UT WOS:A1992JQ75000002 ER PT J AU MCCOWAN, RB PENDLETON, RA FLIFLET, AW AF MCCOWAN, RB PENDLETON, RA FLIFLET, AW TI DESIGN OF AN ELECTRON-GUN FOR A 280-GHZ INDUCED-RESONANCE-ELECTRON-CYCLOTRON(IREC) MASER EXPERIMENT SO IEEE TRANSACTIONS ON ELECTRON DEVICES LA English DT Article ID MAGNETRON INJECTION GUN; GYROTRON AB A thermionic electron gun capable of generating a high-quality annular electron beam for quasi-optical CARM and induced-resonance-electron-cyclotron (IREC) maser applications has been designed. The 500-kV, 200-A MIG-type electron gun has a curved emitting surface designed to compensate for radial electric field gradients across the cathode, and should produce an electron beam with upsilon perpendicular-to/upsilon(z) almost-equal-to 0.5 and DELTA-upsilon(z)/upsilon(z) < 1%. The gun is also capable of producing an electron beam suitable for a multimegawatt 250-kV, 100-GHz quasi-optical gyrotron. Results are presented for electron trajectory calculations which have been performed for both the CARM/IREC maser and gyrotron operating regimes. C1 USN,RES LAB,DIV PLASMA PHYS,RADIAT & PARTICLE BEAM GENERAT SECT,WASHINGTON,DC 20375. VARIAN ASSOCIATES INC,PALO ALTO,CA 94303. NR 7 TC 4 Z9 4 U1 1 U2 4 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0018-9383 J9 IEEE T ELECTRON DEV JI IEEE Trans. Electron Devices PD JUL PY 1992 VL 39 IS 7 BP 1763 EP 1767 DI 10.1109/16.141245 PG 5 WC Engineering, Electrical & Electronic; Physics, Applied SC Engineering; Physics GA HZ823 UT WOS:A1992HZ82300029 ER PT J AU LEE, JS HOPPEL, K AF LEE, JS HOPPEL, K TI PRINCIPAL COMPONENTS TRANSFORMATION OF MULTIFREQUENCY POLARIMETRIC SAR IMAGERY SO IEEE TRANSACTIONS ON GEOSCIENCE AND REMOTE SENSING LA English DT Article ID APERTURE RADAR IMAGES AB A generalized principal components transform (PCT) is developed which maximizes the signal-to-noise ratio (SNR) and which tailors to the multiplicative speckle noise characteristics of polarimetric SAR images. An implementation procedure which accurately estimates the signal and the noise covariance matrices is established. The properties of the eigenvalues and eigenvectors are investigated, revealing that the eigenvectors are not orthogonal, but the principal component images are statistically uncorrelated. Both amplitude (or intensity) and phase difference images are included for the PCT computation. The NASA/JPL polarimetric SAR imagery of P, L, and C bands and quadpolarizations is used for illustration. The capability of this principal components transformation in information compression and speckle reduction enables automated image segmentation and better human interpretation. RP LEE, JS (reprint author), USN,RES LAB,CTR ADV SPACE SENSING,IMAGE SCI SECT,CODE 4232,WASHINGTON,DC 20375, USA. NR 14 TC 53 Z9 55 U1 1 U2 3 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0196-2892 J9 IEEE T GEOSCI REMOTE JI IEEE Trans. Geosci. Remote Sensing PD JUL PY 1992 VL 30 IS 4 BP 686 EP 696 DI 10.1109/36.158862 PG 11 WC Geochemistry & Geophysics; Engineering, Electrical & Electronic; Remote Sensing; Imaging Science & Photographic Technology SC Geochemistry & Geophysics; Engineering; Remote Sensing; Imaging Science & Photographic Technology GA KW360 UT WOS:A1992KW36000006 ER PT J AU MOSKOWITZ, IS MILLER, AR AF MOSKOWITZ, IS MILLER, AR TI THE CHANNEL CAPACITY OF A CERTAIN NOISY TIMING CHANNEL SO IEEE TRANSACTIONS ON INFORMATION THEORY LA English DT Letter DE CHANNEL CAPACITY; COVERT CHANNEL; SPECIAL FUNCTIONS AB The effect of noise upon a simple covert timing channel is investigated. Shannon's information theory is used to quantify the resulting information flow across the channel. In particular, how a probabilistic response time to a query by the receiver affects the mutual information and channel capacity is studied. The channel capacity is expressed in terms of the critical probability for the mutual information function which is given in closed form in terms of Wright's hypergeometric function. C1 GEORGE WASHINGTON UNIV,DEPT MATH,WASHINGTON,DC 20052. RP MOSKOWITZ, IS (reprint author), USN,DIV INFORMAT TECHNOL,CODE 5543,WASHINGTON,DC 20375, USA. NR 17 TC 21 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 0018-9448 J9 IEEE T INFORM THEORY JI IEEE Trans. Inf. Theory PD JUL PY 1992 VL 38 IS 4 BP 1339 EP 1344 DI 10.1109/18.144712 PG 6 WC Computer Science, Information Systems; Engineering, Electrical & Electronic SC Computer Science; Engineering GA JB896 UT WOS:A1992JB89600013 ER PT J AU RHOADES, MM HEALEY, JV AF RHOADES, MM HEALEY, JV TI FLIGHT DECK AERODYNAMICS OF A NONAVIATION SHIP SO JOURNAL OF AIRCRAFT LA English DT Article AB The lack of aerodynamic design of ship superstructures has resulted in sharp-edged box-like structures that generate extremely turbulent recirculating flows which wreak havoc with slow moving helicopter blades and place severe and unnecessary limits on naval operations. Furthermore, there is little understanding of the nature of the flows and no data of the flow statistics from locations where such blades operate, which denies the opportunity of analytically studying the problem. It is possible that the very unfavorable airflows around such ships can be controlled by deflectors, vortex generators, etc., but this first requires an understanding of the flow that is to be controlled. This study investigates in considerable detail the nature of the flow patterns over the aft flight deck of a typical nonaviation scale-model ship in a simulated atmospheric boundary layer and made three-dimensional hot-wire measurements of the now at four points around the locus of a helicopter blade tip for six ship yaw angles. The results will serve as a preliminary data base for the analysis of the blade strike problem and comparison with future computational fluid dynamic (CFD) predictions, in addition to providing a datum from which flow-tailoring can proceed. Extreme levels of velocity gradients and turbulence intensities were found to exist over the flight deck. RP RHOADES, MM (reprint author), USN,POSTGRAD SCH,DEPT AERONAUT & ASTRONAUT,MONTEREY,CA 93943, USA. NR 0 TC 8 Z9 8 U1 1 U2 2 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 JUL-AUG PY 1992 VL 29 IS 4 BP 619 EP 626 DI 10.2514/3.46210 PG 8 WC Engineering, Aerospace SC Engineering GA JG857 UT WOS:A1992JG85700015 ER PT J AU HEBBAR, SK PLATZER, MF CAVAZOS, OV AF HEBBAR, SK PLATZER, MF CAVAZOS, OV TI PITCH RATE SIDESLIP EFFECTS ON LEADING-EDGE EXTENSION VORTICES OF AN F/A-18 AIRCRAFT MODEL SO JOURNAL OF AIRCRAFT LA English DT Note RP HEBBAR, SK (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 JUL-AUG PY 1992 VL 29 IS 4 BP 720 EP 723 DI 10.2514/3.46230 PG 4 WC Engineering, Aerospace SC Engineering GA JG857 UT WOS:A1992JG85700035 ER PT J AU ALM, RA GUERRY, P POWER, ME TRUST, TJ AF ALM, RA GUERRY, P POWER, ME TRUST, TJ TI VARIATION IN ANTIGENICITY AND MOLECULAR-WEIGHT OF CAMPYLOBACTER-COLI VC167 FLAGELLIN IN DIFFERENT GENETIC BACKGROUNDS SO JOURNAL OF BACTERIOLOGY LA English DT Article ID PROTEIN-KINASE-C; ESCHERICHIA-COLI; HALOBACTERIAL FLAGELLINS; INTESTINAL COLONIZATION; NEISSERIA-GONORRHOEAE; JEJUNI INFECTION; FILAMENT PROTEIN; TRANSFORMATION; EXPRESSION; ENTERITIS AB Campylobacter coli VC167 has been shown to undergo a reversible flagellar antigenic variation between antigenic type 1 (T1) and antigenic type 2 (T2). VC167 contains two flagellin genes, and the products of both genes are incorporated into a complex flagellar filament in both antigenic types. Although there are only minor amino acid changes in the flagellins expressed by T1 and T2 cells, the two antigenic types of flagellins can be distinguished by differences in apparent M(r) on sodium dodecyl sulfate-polyacrylamide gels and by immunoreactivity with T1-specific (LA-H1) or T2-specific (LAH2) antiserum. The isolation of stable variants of T1 and T2 has allowed for the transfer via natural transformation of the flagellin structural genes from the T1 background into the T2 background and from the T2 background into the T1 background. In addition, the flagellin genes from VC167 T1 and T2 have been transferred into strains of Campylobacter jejuni. The results indicate that the observed antigenic variations of VC167 flagellins are dependent on the host genetic background and independent of the primary amino acid sequence. These data provide evidence that posttranslational modifications are responsible for the antigenic variation seen in VC167 flagellins. C1 UNIV VICTORIA,DEPT BIOCHEM & MICROBIOL,VICTORIA V8W 3P6,BC,CANADA. USN,ENTER DIS PROGRAM,BETHESDA,MD 20814. NR 62 TC 36 Z9 38 U1 0 U2 1 PU AMER SOC MICROBIOLOGY PI WASHINGTON PA 1325 MASSACHUSETTS AVENUE, NW, WASHINGTON, DC 20005-4171 SN 0021-9193 J9 J BACTERIOL JI J. Bacteriol. PD JUL PY 1992 VL 174 IS 13 BP 4230 EP 4238 PG 9 WC Microbiology SC Microbiology GA JB456 UT WOS:A1992JB45600007 PM 1624417 ER PT J AU WHITSON, SW WHITSON, MA BOWERS, DE FALK, MC AF WHITSON, SW WHITSON, MA BOWERS, DE FALK, MC TI FACTORS INFLUENCING SYNTHESIS AND MINERALIZATION OF BONE-MATRIX FROM FETAL BOVINE BONE-CELLS GROWN-INVITRO SO JOURNAL OF BONE AND MINERAL RESEARCH LA English DT Article ID NODULES FORMED INVITRO; MOUSE CALVARIA; OSTEOBLASTS; CULTURE; DIFFERENTIATION AB This study of the in vitro synthesis and mineralization of bovine bone demonstrates that sheets of mineralized matrix can be produced consistently within 18-24 days of cell isolation. Mineralization surpasses that achieved by other systems with other species: The deposition of mineral extends beyond nodules to form branching trabeculae and then solid wafers of bone. Comparison of the fetal age of the bone source, enzyme digestion methods, seeding density, culture surface, nutritive media, and concentration of fetal calf serum and other additives, including insulin and ascorbic acid, has yielded a set of optimal culture conditions. In the presence of ascorbic acid and beta-glycerol phosphate, insulin has a dose-dependent effect on the morphology of the mineralized bone matrix produced. Quantitative analysis shows that in these cultures calcium accumulates most rapidly between days 6 and 10 after the introduction of mineralization medium but that mineral accretion continues throughout 14-16 days of culture. Alkaline phosphatase levels rise up to 200-fold, concomitant with a rapid increase in the number of cells per culture during the early mineralization phases; both fall as mineralization proceeds. This system has been used to study the induction of mRNA of type I collagen, alkaline phosphatase, and several noncollagenous bone proteins during the course of mineralization. Because of the degree of mineralization achieved with this system, it has many potential applications. C1 USN,MED RES INST,CASUALTY CARE RES DEPT,DIV COMBAT TRAUMA RES,BETHESDA,MD 20814. RP WHITSON, SW (reprint author), SO ILLINOIS UNIV,SCH DENT MED,DEPT BIOMED SCI,2800 COLL AVE,ALTON,IL 62002, USA. NR 34 TC 59 Z9 59 U1 0 U2 0 PU BLACKWELL SCIENCE INC PI MALDEN PA 350 MAIN ST, MALDEN, MA 02148 SN 0884-0431 J9 J BONE MINER RES JI J. Bone Miner. Res. PD JUL PY 1992 VL 7 IS 7 BP 727 EP 741 PG 15 WC Endocrinology & Metabolism SC Endocrinology & Metabolism GA JD680 UT WOS:A1992JD68000002 PM 1642142 ER PT J AU HARRIS, DL HARRIS, DC AF HARRIS, DL HARRIS, DC TI A LOW-COST PH-METER FOR THE CLASSROOM SO JOURNAL OF CHEMICAL EDUCATION LA English DT Article RP HARRIS, DL (reprint author), USN,CTR AIR WARFARE,RES DEPT,DIV CHEM,CHINA LAKE,CA 93555, USA. NR 1 TC 1 Z9 1 U1 1 U2 3 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0021-9584 J9 J CHEM EDUC JI J. Chem. Educ. PD JUL PY 1992 VL 69 IS 7 BP 563 EP 563 PG 1 WC Chemistry, Multidisciplinary; Education, Scientific Disciplines SC Chemistry; Education & Educational Research GA JF947 UT WOS:A1992JF94700021 ER PT J AU GRINSTEIN, FF GUIRGUIS, RH AF GRINSTEIN, FF GUIRGUIS, RH TI EFFECTIVE VISCOSITY IN THE SIMULATION OF SPATIALLY EVOLVING SHEAR FLOWS WITH MONOTONIC FCT MODELS SO JOURNAL OF COMPUTATIONAL PHYSICS LA English DT Article RP GRINSTEIN, FF (reprint author), USN,RES LAB,COMPUTAT PHYS & FLUID DYNAM LAB,WASHINGTON,DC 20375, USA. NR 15 TC 24 Z9 24 U1 0 U2 1 PU ACADEMIC PRESS INC JNL-COMP SUBSCRIPTIONS PI SAN DIEGO PA 525 B ST, STE 1900, SAN DIEGO, CA 92101-4495 SN 0021-9991 J9 J COMPUT PHYS JI J. Comput. Phys. PD JUL PY 1992 VL 101 IS 1 BP 165 EP 175 DI 10.1016/0021-9991(92)90050-9 PG 11 WC Computer Science, Interdisciplinary Applications; Physics, Mathematical SC Computer Science; Physics GA JF127 UT WOS:A1992JF12700013 ER PT J AU BROWN, PC THORNTON, JR BUEDE, DM MILLER, JB AF BROWN, PC THORNTON, JR BUEDE, DM MILLER, JB TI A REVELATION SCHEME FOR ALLOCATING ORGANIZATIONAL RESOURCES SO JOURNAL OF ECONOMIC BEHAVIOR & ORGANIZATION LA English DT Article ID ASYMMETRIC INFORMATION; INCENTIVES AB Efficient resource allocation in a hierarchical organization frequently requires top management to obtain information from division managers. But division managers may place personal interests above those of the organization and communicate distorted information. Designing simple and robust optimal game-theoretic revelation schemes is difficult. Instead of making another attempt at this, we analyze a project valuation scheme actually used by several US government agencies. Under certain environments the scheme encourages managers to truthfully reveal the relative benefits of alternative projects. While some aspects of these environments do not have 'nice' mathematical properties, we argue that they may well represent better characterizations of the way managers actually view their situation. C1 UNIV DELAWARE,DEPT ECON,NEWARK,DE 19716. DECIS LOGIST,RESTON,VA. USN ACAD,NEWARK,DE. NR 14 TC 2 Z9 2 U1 0 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0167-2681 J9 J ECON BEHAV ORGAN JI J. Econ. Behav. Organ. PD JUL PY 1992 VL 18 IS 2 BP 201 EP 214 DI 10.1016/0167-2681(92)90027-9 PG 14 WC Economics SC Business & Economics GA JJ925 UT WOS:A1992JJ92500003 ER PT J AU SMITH, JH LAWRENCE, R CAMPISI, GJ AF SMITH, JH LAWRENCE, R CAMPISI, GJ TI NUMERICAL-ANALYSIS OF SILICON-ON-INSULATOR SHORT CHANNEL EFFECTS IN A RADIATION ENVIRONMENT SO JOURNAL OF ELECTRONIC MATERIALS LA English DT Article; Proceedings Paper CT 3RD WORKSHOP ON RADIATION-INDUCED AND/OR PROCESS-RELATED ELECTRICALLY ACTIVE DEFECTS IN SEMICONDUCTOR-INSULATOR SYSTEMS CY SEP 10-13, 1991 CL RESEARCH TRIANGLE PARK, NC DE SIMOX; RADIATION EFFECTS; SOI; CHARGE DEFECT MODELING AB Radiation-induced charge build-up in the buried oxide (BOX) of SOI MOSFETs affects device performance through threshold voltage shifts of the back channel. This charge build-up is related to the electric field in the BOX during irradiation. In this paper, we report on the application of a numerical model for the potential distribution in a semi-conductor device to the task of determining the electric field in the BOX. This electric field distribution is then combined with a model for charge accumulation as a function of electric field during irradiation to predict the threshold voltage shifts in the back channel of SOI MOSFET devices as a function of channel length. For the device design analyzed here, this model agrees with available experimental data and predicts an increase in back channel threshold shift as the channel length enters the sub-micron regime. C1 ARACOR,WASHINGTON,DC. USN,RES LAB,WASHINGTON,DC 20375. RP SMITH, JH (reprint author), PENN STATE UNIV,CTR ELECTR MAT & PROC,UNIV PK,PA 16802, USA. NR 3 TC 2 Z9 2 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 JUL PY 1992 VL 21 IS 7 BP 683 EP 687 DI 10.1007/BF02655596 PG 5 WC Engineering, Electrical & Electronic; Materials Science, Multidisciplinary; Physics, Applied SC Engineering; Materials Science; Physics GA JE292 UT WOS:A1992JE29200004 ER PT J AU GRISCOM, DL AF GRISCOM, DL TI HYDROGEN MODEL FOR RADIATION-INDUCED INTERFACE STATES IN SIO2-ON-SI STRUCTURES - A REVIEW OF THE EVIDENCE SO JOURNAL OF ELECTRONIC MATERIALS LA English DT Article; Proceedings Paper CT 3RD WORKSHOP ON RADIATION-INDUCED AND/OR PROCESS-RELATED ELECTRICALLY ACTIVE DEFECTS IN SEMICONDUCTOR-INSULATOR SYSTEMS CY SEP 10-13, 1991 CL RESEARCH TRIANGLE PARK, NC DE RADIATION DAMAGE IN MOS; RADIOLYTIC HYDROGEN SPECIES IN OXIDES; HYDROGEN MODEL FOR INTERFACE TRAP GENERATION ID 111 SI-SIO2 INTERFACE; LOW-TEMPERATURE IRRADIATION; ELECTRON-SPIN RESONANCE; TRAP FORMATION; SI/SIO2 INTERFACE; KINETICS; DEFECTS; SILICON; DEVICES; OXIDE AB A brief review is given of the evidence supporting the "hydrogen model" of interface trap generation in silicon-based MOS structures. Emphasis is placed on the importance of electron spin resonance (ESR) in identifying and quantifying certain crucial defect species, including atomic hydrogen, self-trapped holes, and the interface trap itself-the P(b) center. Three types of experiments are considered: (1) low-temperature irradiation and isochronal anneals, (2) pulse radiolysis at room temperature, and (3) exposure of previously-irradiated devices to hydrogen gas. These disparate types of data are all reasonably accounted for by a unified model involving the production of H+ and/or H0 species in the oxide which subsequently drift to the interface where they react with hydrogen-passivated dangling bonds to form P(b) centers. RP GRISCOM, DL (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. NR 33 TC 37 Z9 38 U1 0 U2 6 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 JUL PY 1992 VL 21 IS 7 BP 763 EP 767 DI 10.1007/BF02655608 PG 5 WC Engineering, Electrical & Electronic; Materials Science, Multidisciplinary; Physics, Applied SC Engineering; Materials Science; Physics GA JE292 UT WOS:A1992JE29200016 ER PT J AU SAKS, NS ANDREWS, JM AF SAKS, NS ANDREWS, JM TI EFFECTS OF HYDROGEN ANNEALING ON MOS OXIDES SO JOURNAL OF ELECTRONIC MATERIALS LA English DT Article; Proceedings Paper CT 3RD WORKSHOP ON RADIATION-INDUCED AND/OR PROCESS-RELATED ELECTRICALLY ACTIVE DEFECTS IN SEMICONDUCTOR-INSULATOR SYSTEMS CY SEP 10-13, 1991 CL RESEARCH TRIANGLE PARK, NC DE INSULATOR DEFECTS; ANNEALING OF DEFECTS; HYDROGEN ANNEALING ID INTERFACE TRAP FORMATION; SEMICONDUCTOR DEVICES; CHARGE; TRANSISTORS AB The effects of annealing MOS oxides at high temperatures in hydrogen or deuterium have been studied. Annealing at temperatures above almost-equal-to 800-degrees-C causes a dramatic increase in the radiation sensitivity of the oxide. High temperature annealing also appears to cause a decrease in the dielectric strength of the oxide. Secondary ion mass spectrometry (SIMS) profiles of deuterium-annealed oxides reveal a substantial uptake of deuterium during the annealing. These results suggest that exposure of gate oxides to hydrogen at high temperatures should be avoided. RP SAKS, NS (reprint author), USN,RES LAB,CODE 6813,WASHINGTON,DC 20375, USA. NR 17 TC 6 Z9 6 U1 0 U2 1 PU MINERALS METALS MATERIALS SOC PI WARRENDALE PA 420 COMMONWEALTH DR, WARRENDALE, PA 15086 SN 0361-5235 J9 J ELECTRON MATER JI J. Electron. Mater. PD JUL PY 1992 VL 21 IS 7 BP 775 EP 780 DI 10.1007/BF02655610 PG 6 WC Engineering, Electrical & Electronic; Materials Science, Multidisciplinary; Physics, Applied SC Engineering; Materials Science; Physics GA JE292 UT WOS:A1992JE29200018 ER PT J AU PATTON, JS AF PATTON, JS TI FIRE AND SMOKE CORROSIVITY OF STRUCTURAL-MATERIALS SO JOURNAL OF FIRE SCIENCES LA English DT Article AB The deleterious effects that combustion products generated during fires can have on normal construction materials have been well-documented. The combined effects of fire, corrosive smoke and particulate have been defined as fire corrosivity. While the effects of fire corrosivity are well-known, little quantitative information is available concerning the mechanisms involved and the degree to which materials, particularly metals, are susceptible. Consequently, a study which was conducted to begin examining the effects of fire and smoke corrosivity on metals is described and the results are presented. Various metal targets were exposed to corrosive smoke and fire particulate produced from polyvinylchloride (PVC) samples burned in a cone calorimeter. The target materials consisted of 304 stainless steel, 1010 carbon steel and 70-30 CuNi alloy. In addition to metal targets, electrical resistance probes were also utilized in the testing to monitor in-situ corrosion rates. The probe materials corresponded to the metal targets so that a comparison could be conducted. After testing, both the metal targets and corrosion probes were sectioned and prepared for analysis using standard metallographic techniques. The targets and probes were analyzed for corrosion products and depth of attack. Results from this testing show that all the metal targets proved highly susceptible to the effects of fire and smoke corrosivity attributed to the burning of PVC samples. These results are presented and compared by corrosion rates. In addition, the performance of the corrosion probes in terms of their ability to produce accurate corrosion measurements was evaluated by comparing their corrosion depth measurements to those of the metal targets. It can be concluded from these observations that the testing of structural metals for their resistance to fire corrosivity must be done over a wide range of combustion environments using a large number of targets in order to generate a statistical basis before any predictions can be made concerning a particular alloy's resistance. RP PATTON, JS (reprint author), USN,DAVID TAYLOR RES CTR,CODE 2813,ANNAPOLIS,MD 21402, USA. NR 4 TC 2 Z9 2 U1 0 U2 1 PU TECHNOMIC PUBL CO INC PI LANCASTER PA 851 NEW HOLLAND AVE, BOX 3535, LANCASTER, PA 17604 SN 0734-9041 J9 J FIRE SCI JI J. Fire Sci. PD JUL-AUG PY 1992 VL 10 IS 4 BP 294 EP 322 DI 10.1177/073490419201000403 PG 29 WC Engineering, Multidisciplinary; Materials Science, Multidisciplinary SC Engineering; Materials Science GA JG942 UT WOS:A1992JG94200003 ER PT J AU COYLE, HM UNGARO, R AF COYLE, HM UNGARO, R TI IMPROVED DESIGN PROCEDURES FOR VERTICALLY LOADED H-PILES IN SAND - CLOSURE SO JOURNAL OF GEOTECHNICAL ENGINEERING-ASCE LA English DT Discussion C1 USN,PORT HUENEME,CA 93043. RP COYLE, HM (reprint author), TEXAS A&M UNIV SYST,CIVIL ENGN,COLLEGE STN,TX 77843, USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU ASCE-AMER SOC CIVIL ENGINEERS PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2398 SN 0733-9410 J9 J GEOTECH ENG-ASCE JI J. Geotech. Eng.-ASCE PD JUL PY 1992 VL 118 IS 7 BP 1136 EP 1137 DI 10.1061/(ASCE)0733-9410(1992)118:7(1136.2) PG 2 WC Engineering, Civil; Geosciences, Multidisciplinary SC Engineering; Geology GA JA558 UT WOS:A1992JA55800017 ER PT J AU ROGERS, WL COLLINS, DJ AF ROGERS, WL COLLINS, DJ TI X-29 H-INFINITY CONTROLLER SYNTHESIS SO JOURNAL OF GUIDANCE CONTROL AND DYNAMICS LA English DT Article AB H-2 and H infinity controllers have been designed for the unstable longitudinal analog backup mode of the X-29 aircraft. When actuator design limitations are considered, the expected superiority of the H infinity design over the H-2 design is not obtained. The limited performance designs also do not exhibit the precision flight-path control modes that are characteristic of the H infinity designs. RP ROGERS, WL (reprint author), USN,POSTGRAD SCH,DEPT AERONAUT & ASTRONAUT,MONTEREY,CA 93943, USA. NR 4 TC 4 Z9 6 U1 0 U2 0 PU AMER INST AERONAUT ASTRONAUT PI RESTON PA 1801 ALEXANDER BELL DRIVE, STE 500, RESTON, VA 22091 SN 0731-5090 J9 J GUID CONTROL DYNAM JI J. Guid. Control Dyn. PD JUL-AUG PY 1992 VL 15 IS 4 BP 962 EP 967 DI 10.2514/3.20930 PG 6 WC Engineering, Aerospace; Instruments & Instrumentation SC Engineering; Instruments & Instrumentation GA JE878 UT WOS:A1992JE87800020 ER PT J AU FUJIKAWA, J STRUEWING, JP HYAMS, KC KAPLAN, EL TUPPONCE, AK GRAY, GC AF FUJIKAWA, J STRUEWING, JP HYAMS, KC KAPLAN, EL TUPPONCE, AK GRAY, GC TI ORAL ERYTHROMYCIN PROPHYLAXIS AGAINST STREPTOCOCCUS-PYOGENES INFECTION IN PENICILLIN-ALLERGIC MILITARY RECRUITS - A RANDOMIZED CLINICAL-TRIAL SO JOURNAL OF INFECTIOUS DISEASES LA English DT Note ID CARRIER STATE AB Historically, military recruits have required benzathine penicillin G to prevent epidemics of Streptococcus pyogenes. In this randomized clinical trial, low-dose oral erythromycin was evaluated as an alternative for prophylaxis against group A beta-hemolytic streptococci in penicillin-allergic recruits. US Marine Corps recruits (186) reporting penicillin allergy were randomly given either oral erythromycin (250 mg twice a day) or a vitamin (one tablet daily) for 60 days. Evidence of infection was defined as a two-dilution rise in anti-streptolysin O titer. The erythromycin group had a significantly lower risk of S. pyogenes infection than did the vitamin group (relative risk 0.44; 95% confidence interval, 0.22-0.89). There was no significant difference among the treatment groups in isolation of group A beta-hemolytic streptococci from throat cultures. Low-dose oral erythromycin appears as effective as benzanthine penicillin G in preventing S. pyogenes infection. C1 UNIV MARYLAND,SCH MED,DEPT EPIDEMIOL & PREVENT MED,BALTIMORE,MD 21201. USN,MED RES INST,DIV EPIDEMIOL,BETHESDA,MD 20814. USN,ENVIRONM & PREVENT MED UNIT 5,DEPT EPIDEMIOL,SAN DIEGO,CA 92132. USN,ENVIRONM & PREVENT MED UNIT 5,DEPT MICROBIOL,SAN DIEGO,CA 92132. 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 11 TC 15 Z9 15 U1 0 U2 0 PU UNIV CHICAGO PRESS PI CHICAGO PA 5720 S WOODLAWN AVE, CHICAGO, IL 60637 SN 0022-1899 J9 J INFECT DIS JI J. Infect. Dis. PD JUL PY 1992 VL 166 IS 1 BP 162 EP 165 PG 4 WC Immunology; Infectious Diseases; Microbiology SC Immunology; Infectious Diseases; Microbiology GA HZ746 UT WOS:A1992HZ74600025 PM 1607691 ER PT J AU BURNS, WK KERSEY, AD AF BURNS, WK KERSEY, AD TI FIBEROPTIC GYROSCOPES WITH DEPOLARIZED LIGHT SO JOURNAL OF LIGHTWAVE TECHNOLOGY LA English DT Article ID SINGLE-MODE FIBER; POLARIZATION AB Experimental observations of pi-bias phase shifts causing an inverted interference fringe have been made in fiber gyros using depolarized light and ordinary fiber. These observations are accounted for by a four parameter birefringence model representing the gyro coil which explicitly accounts for polarization mode mixing in the interior of the coil. The addition of a Lyot depolarizer to the coil is shown to remove all birefringence induced effects and to provide a constant scale factor. RP BURNS, WK (reprint author), USN, RES LAB, WASHINGTON, DC 20375 USA. NR 20 TC 30 Z9 33 U1 0 U2 2 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI PISCATAWAY PA 445 HOES LANE, PISCATAWAY, NJ 08855-4141 USA SN 0733-8724 EI 1558-2213 J9 J LIGHTWAVE TECHNOL JI J. Lightwave Technol. PD JUL PY 1992 VL 10 IS 7 BP 992 EP 999 DI 10.1109/50.144925 PG 8 WC Engineering, Electrical & Electronic; Optics; Telecommunications SC Engineering; Optics; Telecommunications GA JC942 UT WOS:A1992JC94200020 ER EF