FN Thomson Reuters Web of Science™ VR 1.0 PT J AU OWENS, A PAGE, CG SEMBAY, S SCHAEFER, BE AF OWENS, A PAGE, CG SEMBAY, S SCHAEFER, BE TI A ROSAT WIDE FIELD CAMERA SEARCH FOR XUV BURSTS SO MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY LA English DT Letter DE GAMMA-RAYS, BURSTS; X-RAYS, BURSTS ID GAMMA-RAY BURSTS; CONSTRAINTS AB We have searched the ROSAT Wide Field Camera (WFC) all-sky survey for short-time-scale (< 50 s) XUV bursts down to a limiting count of 5 X 10(-3) Count arcmin-2, corresponding to an incident flux of approximately 3 X 10(-10) erg cm - 2. In a total observation period of 171 d covering the entire sky, we found no evidence for such events. The present results are used to place limits on the log N-log S relation for gamma-ray bursts and constraints on the spectral shape of the previously reported ultrasoft X-ray transients. C1 NASA, GODDARD SPACE FLIGHT CTR, HIGH ENERGY ASTROPHYS LAB, GREENBELT, MD 20771 USA. RP OWENS, A (reprint author), UNIV LEICESTER, DEPT PHYS & ASTRON, LEICESTER LE1 7RH, ENGLAND. NR 14 TC 4 Z9 4 U1 0 U2 0 PU OXFORD UNIV PRESS PI OXFORD PA GREAT CLARENDON ST, OXFORD OX2 6DP, ENGLAND SN 0035-8711 EI 1365-2966 J9 MON NOT R ASTRON SOC JI Mon. Not. Roy. Astron. Soc. PD FEB 15 PY 1993 VL 260 IS 4 BP L25 EP L27 PG 3 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA KL794 UT WOS:A1993KL79400001 ER PT J AU KING, ME NATHANSON, GM HANNINGLEE, MA MINTON, TK AF KING, ME NATHANSON, GM HANNINGLEE, MA MINTON, TK TI PROBING THE MICROSCOPIC CORRUGATION OF LIQUID SURFACES WITH GAS-LIQUID COLLISIONS SO PHYSICAL REVIEW LETTERS LA English DT Article ID SCATTERING AB We have measured the directions and velocities of Ne, Ar, and Xe atoms scattering from perfluorinated ether and hydrocarbon liquids to probe the relationship between the microscopic roughness of liquid surfaces and gas-liquid collision dynamics. Impulsive energy transfer is governed by the angle of deflection: head-on encounters deposit more energy than grazing collisions. Many atoms scatter in the forward direction, particularly at glancing incidence. These results imply that the incoming atoms recoil locally from protruding C-H and C-F groups in hard spherelike collisions. C1 UNIV WISCONSIN,DEPT CHEM,1101 UNIV AVE,MADISON,WI 53706. JET PROP LAB,PASADENA,CA 91109. NR 12 TC 106 Z9 106 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 FEB 15 PY 1993 VL 70 IS 7 BP 1026 EP 1029 DI 10.1103/PhysRevLett.70.1026 PG 4 WC Physics, Multidisciplinary SC Physics GA KM166 UT WOS:A1993KM16600039 ER PT J AU SEMBAY, S WARWICK, RS URRY, CM SOKOLOSKI, J GEORGE, IM MAKINO, F OHASHI, T TASHIRO, M AF SEMBAY, S WARWICK, RS URRY, CM SOKOLOSKI, J GEORGE, IM MAKINO, F OHASHI, T TASHIRO, M TI THE X-RAY SPECTRAL VARIABILITY OF THE BL LACERTAE TYPE OBJECT PKS-2155-304 SO ASTROPHYSICAL JOURNAL LA English DT Article DE BL LACERTAE OBJECTS, INDIVIDUAL, (PKS-2155-304); RADIATION MECHANISMS, CYCLOTRON AND SYNCHROTRON; X-RAYS, GALAXIES ID PKS 2155-304; OPTICAL OBSERVATIONS; ABSORPTION FEATURE; ULTRAVIOLET; EMISSION; EXOSAT; MODEL; GINGA AB We present a detailed study of the hard X-ray properties of the BL Lacertae object PKS 2155-304 based on measurements made in 1988 and 1989 with the Large Area Counter (LAC) on board the Ginga satellite. The source exhibited a high degree of variability with a dynamic range of a factor 7 in the 2-6 keV band. The fastest amplitude variation was a factor 2 decline in the intensity in this band within 4 hours. The spectrum is characterized by a break which occurs at approximately 4 keV. Spectral fits to the data integrated in 6400 s time bins reveal that, in common with previous observations of BL Lacertae objects, the spectral slope is generally anticorrelated with intensity in the sense that the spectrum hardens as the intensity increases. However, the tracks of sequential points in the index-intensity plane are occasionally seen to differ during the rise and decay stages of individual flares. Furthermore, during one, or possibly two, flaring episodes the spectral index is observed to correlate with intensity variations. The X-ray properties of PKS 2155-304 are most readily interpreted in terms of direct synchrotron radiation originating within a relativistic jet, however, the X-ray emitting region is probably more complex than the geometries assumed in most standard jet models. Further development of time-dependent theoretical models will be necessary to explain some of the details of the present observations. C1 SPACE TELESCOPE SCI INST,BALTIMORE,MD 21218. NASA,GODDARD SPACE FLIGHT CTR,HEASARC,GREENBELT,MD 20771. INST SPACE & ASTRONAUT SCI,SAGAMIHARA,KANAGAWA 229,JAPAN. UNIV TOKYO,DEPT PHYS,TOKYO 113,JAPAN. RP SEMBAY, S (reprint author), UNIV LEICESTER,DEPT METAB,UNIV RD,LEICESTER LE1 7RH,ENGLAND. RI Tashiro, Makoto/J-4562-2012; Urry, Claudia/G-7381-2011 OI Urry, Claudia/0000-0002-0745-9792 NR 32 TC 84 Z9 85 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 FEB 10 PY 1993 VL 404 IS 1 BP 112 EP 123 DI 10.1086/172263 PN 1 PG 12 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA KK912 UT WOS:A1993KK91200011 ER PT J AU HUENEMOERDER, DP RAMSEY, LW BUZASI, DL NATIONS, HL AF HUENEMOERDER, DP RAMSEY, LW BUZASI, DL NATIONS, HL TI A SPECTROSCOPIC AND PHOTOMETRIC-STUDY OF FK-COMAE IN 1989 SO ASTROPHYSICAL JOURNAL LA English DT Article DE STARS, GIANT; STARS, INDIVIDUAL (FK COMAE); ULTRAVIOLET, STARS ID RAPIDLY ROTATING STARS; BINARY STARS; CORONAE AB FK Comae is probably a recently coalesced binary system, since it is a G-type giant rotating near breakup yet has no detected orbital motion. To better understand its characteristics, which include extreme atmospheric activity and rapid variability, an intensive spectroscopic campaign was undertaken. Fifty-one CCD-echelle spectra of this atmospherically active, rapidly rotating single giant were obtained over a period of eight nights in the spring of 1989. Visual photometry and seven IUE spectra were acquired contemporaneously. The photometry showed smooth quasi-sinusoidal modulation with an amplitude of about 0.1 mag. Absorption and emission lines showed complicated but systematic behavior. Photospheric absorption lines were distorted by a Doppler-shifted bump caused by dark starspots resulting in small apparent radial velocity variations. No radial velocity variations characteristic of orbital motion were seen to a level of 3 km s-1. Broad emission in Halpha was modulated at the photospheric rotational amplitude, implying an origin no farther from the rotational axis than 1 stellar radius. Strong absorption appears within the Balmer emission as the starspot crosses the disk. The strengths of Ca II lines are modulated in phase with Halpha but do not have velocity-modulated wings like Halpha. He I D3 showed very complex and interesting behavior. It had an absorption core, emission wings, and modulation with more structure than the Balmer lines. It is probably responding to the coronal X-ray flux geometric distribution. While time coverage is not as good for the UV lines, Mg II correlates well with Halpha but the higher temperature lines do not. C1 JET PROP LAB,PASADENA,CA 91109. PENN STATE UNIV,DEPT ASTRON & ASTROPHYS,DAVEY LAB 525,UNIV PK,PA 16802. JOHNS HOPKINS UNIV,BALTIMORE,MD 21218. VILLANOVA UNIV,DEPT ASTRON & ASTROPHYS,VILLANOVA,PA 19085. NR 30 TC 37 Z9 37 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 FEB 10 PY 1993 VL 404 IS 1 BP 316 EP 327 DI 10.1086/172281 PN 1 PG 12 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA KK912 UT WOS:A1993KK91200029 ER PT J AU CHERNOMORDIK, VV OZERNOY, LM AF CHERNOMORDIK, VV OZERNOY, LM TI THE QUASAR PROXIMITY EFFECT IN AN EQUIVALENT-WIDTH-LIMITED SAMPLE OF THE LYMAN-ALPHA FOREST SO ASTROPHYSICAL JOURNAL LA English DT Article DE COSMOLOGY, OBSERVATIONS; INTERGALACTIC MEDIUM; QUASARS, GENERAL; LINE, PROFILES ID HIGH-REDSHIFT; ABSORBING CLOUDS; ABSORPTION; SPECTRA; QSOS AB We have obtained a simple analytical approximation to the relationship between a rest-frame equivalent-width distribution for Lyalpha forest absorption lines, N(W), and an H I column density distribution of the observed cloud number, N(N). Assuming a simple power-law form for N(N) is-proportional-to N1-beta, it is shown that beta = 1.4 turns out to agree fairly well with the observed form of N(W) in a broad range of column densities, 10(13) cm-2 less than or similar to N less than or similar to 5 x 10(16) cm-2, which corresponds to equivalent-width range W = 0.06-0.7 angstrom. We present a theoretical analysis of how the ''proximity effect'' influences a W-limited sample of Lyalpha forest lines. It is shown that this influence is considerably smaller than has been found before for a N-limited sample, for which an approximate value of beta (almost-equal-to 1.7) was assumed rather than derived as has been done, for a W-limited sample, in the present paper. As a result, available observational data appear to be still consistent with the conjecture that the observed population of QSOs is the major source of the UV background at redshifts z almost-equal-to 2-4. C1 NASA,GODDARD SPACE FLIGHT CTR,HIGH ENERGY ASTROPHYS LAB,GREENBELT,MD 20771. NASA,GODDARD SPACE FLIGHT CTR,ASTRON & SOLAR PHYS LAB,GREENBELT,MD 20771. RP CHERNOMORDIK, VV (reprint author), RUSSIAN ACAD SCI,SCI COUNCIL CYBERNET,MOSCOW 125315,RUSSIA. NR 16 TC 8 Z9 8 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 FEB 10 PY 1993 VL 404 IS 1 BP L5 EP L8 DI 10.1086/186730 PN 2 PG 4 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA KK913 UT WOS:A1993KK91300002 ER PT J AU HUDSON, RL MOORE, MH AF HUDSON, RL MOORE, MH TI FAR-INFRARED INVESTIGATIONS OF A METHANOL CLATHRATE HYDRATE - IMPLICATIONS FOR ASTRONOMICAL OBSERVATIONS SO ASTROPHYSICAL JOURNAL LA English DT Article DE COMETS, GENERAL; COSMIC RAYS; MOLECULAR PROCESSES ID SOLID METHANOL; CARBON-DIOXIDE; AMORPHOUS ICE; SPECTRA; WATER AB Observations of nonterrestrial clathrate hydrates are still lacking despite the fact that clathrates first were suggested to exist in cometary and interstellar ices over 40 years ago. Spectroscopy, the most direct method of astronomical detection, has been hampered by the similarity of clathrate hydrate spectra to those of unenclathrated guest molecules and solid H2O. We have prepared a methanol (CH3OH) clathrate hydrate, using a recently published procedure, and have investigated its far-infrared spectrum. The spectrum is quite different from that of either unenclathrated CH3OH or solid H2O and so should be of value in astronomical searches for this clathrate. C1 NASA,GODDARD SPACE FLIGHT CTR,ASTROCHEM BRANCH,GREENBELT,MD 20771. RP HUDSON, RL (reprint author), ECKERD COLL,DEPT CHEM,ST PETERSBURG,FL 33733, USA. RI Hudson, Reggie/E-2335-2012 NR 31 TC 6 Z9 6 U1 1 U2 4 PU UNIV CHICAGO PRESS PI CHICAGO PA 5720 S WOODLAWN AVE, CHICAGO, IL 60637 SN 0004-637X J9 ASTROPHYS J JI Astrophys. J. PD FEB 10 PY 1993 VL 404 IS 1 BP L29 EP L32 DI 10.1086/186736 PN 2 PG 4 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA KK913 UT WOS:A1993KK91300008 ER PT J AU MULCHAEY, JS DAVIS, DS MUSHOTZKY, RF BURSTEIN, D AF MULCHAEY, JS DAVIS, DS MUSHOTZKY, RF BURSTEIN, D TI DIFFUSE-X-RAY EMISSION FROM THE NGC-2300 GROUP OF GALAXIES - IMPLICATIONS FOR DARK MATTER AND GALAXY EVOLUTION IN SMALL-GROUPS SO ASTROPHYSICAL JOURNAL LA English DT Article DE DARK MATTER; GALAXIES, ELLIPTIC AND LENTICULAR, CD; GALAXIES, EVOLUTION; GALAXIES, INDIVIDUAL (NGC-2276, NGC-2300); INTERGALACTIC MEDIUM; X-RAYS, GALAXIES ID SPIRAL GALAXIES; CLUSTERS; EINSTEIN; GAS AB We report the detection of a hot, diffuse intragroup medium with the ROSAT Position Sensitive Proportional Counter in the NGC 2300 group of galaxies. This is the first time such a gas component has been found in a small group. The gas distribution is roughly symmetric, centered within approximately 3' of the elliptical NGC 2300, and extends to a radius of at least 0.2 h50(-1) Mpc. A Raymond-Smith (1977) hot plasma model provides an excellent fit to the X-ray spectrum, with a best-fit value temperature of 0.9(-0.14)+0.15 keV and abundance 0.06(-0.05)+0.12 solar. This temperature, combined with the assumption of gravitational confinement, leads to a total mass of the group of 3.0(-0.5)+0.4 x 10(13) M.. A reasonable estimate of the baryonic mass in galaxies and diffuse gas indicates that baryons can account for approximately 4% of this mass. A conspiracy of errors could push this number no higher than 10%-15%. This is one of the strongest pieces of evidence that dark matter dominates small groups such as this one, and is in agreement with dynamical arguments for masses of groups of galaxies. The intragroup medium in this system has the lowest metal abundance yet found in diffuse gas in a group or cluster. While not as dense as in clusters, the intragroup medium is still capable of significantly affecting the outer parts of galaxies in this group. In particular, the spiral galaxy NGC 2276 displays asymmetries in its optical and radio morphologies suggestive of an ongoing intragroup medium-galaxy encounter. This peculiar ''bowshock-shaped'' morphology is shared by spiral galaxies in other nearby groups, suggesting that it can be used as an optical indicator of the presence of a diffuse intragroup medium. C1 NASA,GODDARD SPACE FLIGHT CTR,HIGH ENERGY ASTROPHYS LAB,GREENBELT,MD 20771. ARIZONA STATE UNIV,DEPT PHYS & ASTRON,TEMPE,AZ 85287. UNIV MARYLAND,DEPT ASTRON,COLL PK,MD 20742. RP MULCHAEY, JS (reprint author), SPACE TELESCOPE SCI INST,3700 SAN MARTIN DR,BALTIMORE,MD 21218, USA. NR 36 TC 111 Z9 113 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 FEB 10 PY 1993 VL 404 IS 1 BP L9 EP & DI 10.1086/186731 PN 2 PG 0 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA KK913 UT WOS:A1993KK91300003 ER PT J AU TAMURA, M HAYASHI, SS YAMASHITA, T DUNCAN, WD HOUGH, JH AF TAMURA, M HAYASHI, SS YAMASHITA, T DUNCAN, WD HOUGH, JH TI MAGNETIC-FIELD IN A LOW-MASS PROTOSTAR DISK - MILLIMETER POLARIMETRY OF IRAS 16293-2422 SO ASTROPHYSICAL JOURNAL LA English DT Article DE INFRARED, INTERSTELLAR, CONTINUUM; POLARIZATION; STARS, FORMATION; STARS, INDIVIDUAL (IRAS 16293-2422) ID INFRARED POLARIMETRY; MAXWELL,JAMES,CLERK TELESCOPE; MOLECULAR OUTFLOW; BIPOLAR OUTFLOW; STAR FORMATION; ORION NEBULA; DARK CLOUDS; POLARIZATION; CONTINUUM; RADIATION AB We have measured the millimeter polarization of IRAS 16293-2422, a low-mass protostar candidate embedded in the east streamer of the rho Ophiuchi dark cloud. The source has a linear polarization at 1.1 mm of (2.8 +/- 0.5)% at a position angle of 144-degrees +/- 5-degrees with a 19'' beam. If this polarization is due to thermal emission from magnetically aligned nonspherical grains in a dust disk around the central (proto)star, then the magnetic field threads across the disk at a position angle of 54-degrees +/- 5-degrees projected on the sky. This direction is the same as that of the minor axis of the elongated circumstellar gas disk (of scale 1600 AU) and of the direction of one of the quadratic outflows. The direction of the disk magnetic field is also in good agreement with that of the large-scale (1 to 10 pc) magnetic field of the molecular cloud as inferred from previous near-infrared and optical polarimetry of background field stars. There is, therefore, no positive evidence for a twisted magnetic field in the dust disk, which constrains the hydromagnetic models for molecular outflows, at least for this source. C1 JET PROP LAB,PASADENA,CA 91109. JOINT ASTRON CTR,HILO,HI 96720. UNIV HERTFORDSHIRE,DIV PHYS SCI,HATFIELD AL10 9AB,HERTS,ENGLAND. RP TAMURA, M (reprint author), NATL ASTRON OBSERV,MITAKA,TOKYO 181,JAPAN. NR 40 TC 20 Z9 20 U1 0 U2 0 PU UNIV CHICAGO PRESS PI CHICAGO PA 5720 S WOODLAWN AVE, CHICAGO, IL 60637 SN 0004-637X J9 ASTROPHYS J JI Astrophys. J. PD FEB 10 PY 1993 VL 404 IS 1 BP L21 EP L24 DI 10.1086/186734 PN 2 PG 4 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA KK913 UT WOS:A1993KK91300006 ER PT J AU JAYATIRTHA, HN HENDERSON, DO BURGER, A VOLZ, MP AF JAYATIRTHA, HN HENDERSON, DO BURGER, A VOLZ, MP TI STUDY OF TELLURIUM PRECIPITATES IN CDTE CRYSTALS SO APPLIED PHYSICS LETTERS LA English DT Article AB The effect of tellurium precipitates was studied in medium resistivity (10(3)-10(6) OMEGA CM) undoped and Cl-doped CdTe using differential scanning calorimetry (DSC) and mid-infrared spectroscopy and the results were correlated with near-infrared microscopy photographs. When present in a significant quantity (approximately 0.25 wt %), we show that Te precipitates are detectable using DSC measurements. In the mid-infrared, the contribution of the absorption by free-carriers is negligible, and therefore, the effect of the Te precipitates in these crystals can be considered uncoupled from the effects of Cd vacancies. C1 NASA,GEORGE C MARSHALL SPACE FLIGHT CTR,SPACE SCI LAB,HUNTSVILLE,AL 35812. RP JAYATIRTHA, HN (reprint author), FISK UNIV,DEPT PHYS,CTR PHOTON MAT & DEVICES,NASHVILLE,TN 37208, USA. NR 17 TC 33 Z9 35 U1 1 U2 2 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0003-6951 J9 APPL PHYS LETT JI Appl. Phys. Lett. PD FEB 8 PY 1993 VL 62 IS 6 BP 573 EP 575 DI 10.1063/1.108885 PG 3 WC Physics, Applied SC Physics GA KK924 UT WOS:A1993KK92400012 ER PT J AU SCHATZ, GC FLORANCE, S LEE, TJ BAUSCHLICHER, CW AF SCHATZ, GC FLORANCE, S LEE, TJ BAUSCHLICHER, CW TI ABINITIO POTENTIAL-ENERGY SURFACE FOR IHI- - SIMULATION OF IHI- PHOTODETACHMENT SPECTRA SO CHEMICAL PHYSICS LETTERS LA English DT Article ID I+HI; SPECTROSCOPY; FREQUENCIES; CLHCL; HEAVY AB Ab initio calculations are used to develop a potential energy surface for the IHI- molecule. Wavefunctions for some of the lowest vibrational states associated with this surface are then used to calculate transition state photodetachment spectra. The resulting spectra show small but important changes relative to those obtained previously with a harmonic force field. The spectra associated with IHI- vibrationally excited states are significantly different from the ground state, revealing more details of the IHI transition state structure. C1 NASA, AMES RES CTR, MOFFETT FIELD, CA 94035 USA. RP SCHATZ, GC (reprint author), NORTHWESTERN UNIV, DEPT CHEM, EVANSTON, IL 60208 USA. RI Lee, Timothy/K-2838-2012 NR 26 TC 10 Z9 10 U1 0 U2 3 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0009-2614 J9 CHEM PHYS LETT JI Chem. Phys. Lett. PD FEB 5 PY 1993 VL 202 IS 6 BP 495 EP 500 DI 10.1016/0009-2614(93)90037-2 PG 6 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA KK992 UT WOS:A1993KK99200008 ER PT J AU SUESS, ST MCCOMAS, DJ HOEKSEMA, JT AF SUESS, ST MCCOMAS, DJ HOEKSEMA, JT TI PREDICTION OF THE HELIOSPHERIC CURRENT SHEET TILT - 1992-1996 SO GEOPHYSICAL RESEARCH LETTERS LA English DT Article ID MAGNETIC-FIELD; SOLAR; EVOLUTION AB Heliospheric current sheet tilt evolves systematically over the solar cycle. Here we show that this evolution is different than the sunspot cycle and that tilt for the period 1992 - 1996 can be predicted using persistence. That is, the tilt over the coming cycle will be the same as for the past cycle. The Ulysses spacecraft has passed Jupiter and is moving out of the plane of the ecliptic, so we use the prediction of the changing heliospheric current sheet tilt to predict that Ulysses will pass beyond the envelope, or maximum latitude, of the heliospheric current sheet in November 1993. C1 STANFORD UNIV,CTR SPACE SCI ASTROPHYS,STANFORD,CA 94305. LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545. RP SUESS, ST (reprint author), NASA,GEORGE C MARSHALL SPACE FLIGHT CTR,ES52,HUNTSVILLE,AL 35812, USA. NR 10 TC 25 Z9 25 U1 0 U2 0 PU AMER GEOPHYSICAL UNION PI WASHINGTON PA 2000 FLORIDA AVE NW, WASHINGTON, DC 20009 SN 0094-8276 J9 GEOPHYS RES LETT JI Geophys. Res. Lett. PD FEB 5 PY 1993 VL 20 IS 3 BP 161 EP 164 DI 10.1029/93GL00078 PG 4 WC Geosciences, Multidisciplinary SC Geology GA KM058 UT WOS:A1993KM05800001 ER PT J AU TAN, LC MASON, GM TSURUTANI, BT AF TAN, LC MASON, GM TSURUTANI, BT TI EVIDENCE FOR PROTON CYCLOTRON WAVES NEAR COMET GIACOBINI-ZINNER SO GEOPHYSICAL RESEARCH LETTERS LA English DT Article ID STEEPENED MAGNETOSONIC WAVES; COMPUTER-SIMULATIONS; ION INSTABILITIES; UPSTREAM; HALLEY; ENVIRONMENT; PACKETS AB We have computed frequency spectra of power density and polarization parameters of magnetohydrodynamic waves from observations on board the ICE spacecraft as it flew past comet Giacobini-Zinner on September 11, 1985. Since the spectral parameters are frequency dependent, we find that the analysis is best carried out in a 'wave' reference frame where one of the major axes is along the wave normal direction for each frequency component. The power density along the wave normal direction shows a systematic peak structure which we identify as belonging to cyclotron wave harmonics of pick-up ions (H+, H-2+, and O+) near the comet. The fundamental harmonics of the cyclotron waves are also consistent with the gyrofrequencies calculated from the magnetic field data. C1 UNIV MARYLAND,INST PHYS SCI & TECHNOL,COLL PK,MD 20742. JET PROP LAB,PASADENA,CA 91109. RP TAN, LC (reprint author), UNIV MARYLAND,DEPT PHYS,COLL PK,MD 20742, USA. NR 19 TC 5 Z9 5 U1 0 U2 0 PU AMER GEOPHYSICAL UNION PI WASHINGTON PA 2000 FLORIDA AVE NW, WASHINGTON, DC 20009 SN 0094-8276 J9 GEOPHYS RES LETT JI Geophys. Res. Lett. PD FEB 5 PY 1993 VL 20 IS 3 BP 169 EP 172 DI 10.1029/93GL00069 PG 4 WC Geosciences, Multidisciplinary SC Geology GA KM058 UT WOS:A1993KM05800003 ER PT J AU LERCH, FJ NEREM, RS CHINN, DS CHAN, JC PATEL, GB KLOSKO, SM AF LERCH, FJ NEREM, RS CHINN, DS CHAN, JC PATEL, GB KLOSKO, SM TI NEW ERROR CALIBRATION TESTS FOR GRAVITY MODELS USING SUBSET SOLUTIONS AND INDEPENDENT DATA - APPLIED TO GEM-T3 SO GEOPHYSICAL RESEARCH LETTERS LA English DT Article ID GRAVITATIONAL MODEL AB Orbit error projections based on the error covariance estimates of Goddard Earth Model (GEM)-T3 have been shown to be reliable through their projection on observation residuals within independent data sets. Special geopotential solutions were developed based upon the same data set and weighting used in the GEM-T3 gravity model, but with a significant satellite data set eliminated from the solution. These subset gravity models are then used to compute the observation residuals within orbital solutions for the omitted satellite and the results are compared to their predicted values based on the error covariance of these models. To ensure meaningful results, the tests were designed so that the observation residuals are dominated by geopotential modeling errors. This yields a reliable test of the error estimates of the subset solutions and hence tests the data weighting used in the construction of these models (GEM-T3 and subset solutions alike). The error estimates for GEM-T3 are based upon an optimal data weighting method and have been obtained in a separate calibration process. The test results shown here indicate that the GEM-T3 error estimates for the gravity parameters are calibrated and that the predicted orbit errors correspond well with actual orbit accuracies. Test results of the complete GEM-T3 model with totally independent high precision DORIS Doppler tracking data acquired on the French SPOT-2 satellite confirms these conclusions. C1 HUGHES STX CORP,LANHAM,MD 20706. RP LERCH, FJ (reprint author), NASA,GODDARD SPACE FLIGHT CTR,SPACE GEODESY BRANCH,CODE 926,GREENBELT,MD 20771, USA. NR 10 TC 10 Z9 10 U1 0 U2 0 PU AMER GEOPHYSICAL UNION PI WASHINGTON PA 2000 FLORIDA AVE NW, WASHINGTON, DC 20009 SN 0094-8276 J9 GEOPHYS RES LETT JI Geophys. Res. Lett. PD FEB 5 PY 1993 VL 20 IS 3 BP 249 EP 252 DI 10.1029/92GL02824 PG 4 WC Geosciences, Multidisciplinary SC Geology GA KM058 UT WOS:A1993KM05800023 ER PT J AU CHAO, BF AF CHAO, BF TI EXCITATION OF EARTHS POLAR MOTION BY ATMOSPHERIC ANGULAR-MOMENTUM VARIATIONS, 1980-1990 SO GEOPHYSICAL RESEARCH LETTERS LA English DT Article ID WOBBLE AB We compute the polar-motion excitation function due to the atmospheric angular momentum (AAM) for both IB (inverted-barometer) and non-IB cases, as well as the excitation function from geodetically observed Earth orientation data for the period 1980-1990. The two are then compared in studying the AAM contribution to the polar motion excitation. The polar drifts with periods longer than approximately 2 years have similar characteristics, but the comparison is inconclusive because of data uncertainties. For the seasonal wobble excitation, the agreement is poor except for the prograde annual wobble, indicating the influence of other geophysical excitations than AAM. For the Chandler wobble excitation, a correlation coefficient of 0.53 for non-IB and 0.58 for IB are found for 1986-1990. Together with a coherence spectral analysis, they clearly demonstrate a strong contribution of AAM to the Chandler wobble excitation. RP CHAO, BF (reprint author), NASA,GODDARD SPACE FLIGHT CTR,GEODYNAM BRANCH,GREENBELT,MD 20771, USA. RI Chao, Benjamin Fong/N-6156-2013 NR 13 TC 40 Z9 43 U1 0 U2 0 PU AMER GEOPHYSICAL UNION PI WASHINGTON PA 2000 FLORIDA AVE NW, WASHINGTON, DC 20009 SN 0094-8276 J9 GEOPHYS RES LETT JI Geophys. Res. Lett. PD FEB 5 PY 1993 VL 20 IS 3 BP 253 EP 256 PG 4 WC Geosciences, Multidisciplinary SC Geology GA KM058 UT WOS:A1993KM05800024 ER PT J AU ROSENFELD, D ALTEROVITZ, SA AF ROSENFELD, D ALTEROVITZ, SA TI HIGH-FREQUENCY PERFORMANCE OF SI1-XGEX/SI1-YGEY/SI1-XGEXHBTS SO ELECTRONICS LETTERS LA English DT Article DE BIPOLAR DEVICES; TRANSISTORS; SEMICONDUCTOR DEVICES AND MATERIALS ID BIPOLAR-TRANSISTORS; HETEROJUNCTION AB The results of a theoretical study of the performance of high speed SiGe HBTs is presented. The study includes a group of SiGe HBTs in which the Ge concentration in the base is 20% higher than that in the emitter and collector (i.e. y = x + 0.2). It is shown that the composition dependences of f(T) and the f(max) are non-monotonic. As the Ge composition in the emitter and collector layers is increased, f(T) and f(max) first decrease, then remain constant and finally increase to attain their highest values. C1 TECHNION ISRAEL INST TECHNOL,FAC ELECT ENGN,HAIFA,ISRAEL. RP ROSENFELD, D (reprint author), NASA,LEWIS RES CTR,MAIL STOP 54-5,21000 BROOKPARK RD,CLEVELAND,OH 44135, USA. NR 10 TC 2 Z9 2 U1 0 U2 0 PU IEE-INST ELEC ENG PI HERTFORD PA MICHAEL FARADAY HOUSE SIX HILLS WAY STEVENAGE, HERTFORD, ENGLAND SG1 2AY SN 0013-5194 J9 ELECTRON LETT JI Electron. Lett. PD FEB 4 PY 1993 VL 29 IS 3 BP 260 EP 261 DI 10.1049/el:19930178 PG 2 WC Engineering, Electrical & Electronic SC Engineering GA LB764 UT WOS:A1993LB76400008 ER PT J AU FU, R LIU, WT DELGENIO, AD ROSSOW, WB AF FU, R LIU, WT DELGENIO, AD ROSSOW, WB TI A THERMOSTAT IN THE TROPICS - REPLY SO NATURE LA English DT Letter ID CLOUDS C1 UNIV CALIF LOS ANGELES,DEPT ATMOSPHER SCI,LOS ANGELES,CA 90024. NASA,GODDARD INST SPACE STUDIES,NEW YORK,NY 10025. RP FU, R (reprint author), NASA,JET PROPULS LAB,PASADENA,CA 91109, USA. RI Del Genio, Anthony/D-4663-2012; Fu, Rong/B-4922-2011; Rossow, William/F-3138-2015 OI Del Genio, Anthony/0000-0001-7450-1359; NR 7 TC 2 Z9 2 U1 0 U2 1 PU MACMILLAN MAGAZINES LTD PI LONDON PA PORTERS SOUTH, 4 CRINAN ST, LONDON, ENGLAND N1 9XW SN 0028-0836 J9 NATURE JI Nature PD FEB 4 PY 1993 VL 361 IS 6411 BP 412 EP 412 DI 10.1038/361412a0 PG 1 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA KK713 UT WOS:A1993KK71300038 ER PT J AU LOVE, DC RICE, SD MOLES, DA EATON, WD AF LOVE, DC RICE, SD MOLES, DA EATON, WD TI SEASONAL PREVALENCE AND INTENSITY OF BITTER CRAB DINOFLAGELLATE INFECTION AND HOST MORTALITY IN ALASKAN TANNER CRABS CHIONOECETES-BAIRDI FROM AUKE BAY, ALASKA, USA SO DISEASES OF AQUATIC ORGANISMS LA English DT Article AB Since the 1984-1985 Tanner crab Chionoecetes bairdi season in southeastern Alaska, USA, an increasing number of crabs infected with a dinoflagellate parasite similar to Hematodinium perezi have been identified in the commercial catches. This parasite causes a fatal disease known as Bitter Crab Disease (BCD) with peak mortality occurring during August and September. Average intensity and prevalence of this disease, as well as dinospore releases in Auke Bay Tanner crabs increased from May until August and September in both 1989 and 1990 falling again to zero by mid-winter. Prevalence of BCD infection and host mortality was not significantly different between years. Knowledge of the seasonal prevalence and intensity of BCD parasitism and associated host mortality would assist management in conserving local Tanner crab stocks. C1 MALASPINA COLL,DEPT BIOL,900 5TH AVE,NANAIMO V9R 5S5,BC,CANADA. UNIV ALASKA FAIRBANKS,JUNEAU CTR FISHERIES & OCEAN SCI,JUNEAU,AK 99801. NATL MARINE FISHERIES SERV,AUKE BAY LAB,JUNEAU,AK 99801. NR 12 TC 36 Z9 40 U1 2 U2 3 PU INTER-RESEARCH PI OLDENDORF LUHE PA NORDBUNTE 23, D-21385 OLDENDORF LUHE, GERMANY SN 0177-5103 J9 DIS AQUAT ORGAN JI Dis. Aquat. Org. PD FEB 2 PY 1993 VL 15 IS 1 BP 1 EP 7 DI 10.3354/dao015001 PG 7 WC Fisheries; Veterinary Sciences SC Fisheries; Veterinary Sciences GA KN790 UT WOS:A1993KN79000001 ER PT J AU SCHNEIDER, VS LEBLANC, A HUNTOON, CL AF SCHNEIDER, VS LEBLANC, A HUNTOON, CL TI PREVENTION OF SPACE-FLIGHT INDUCED SOFT-TISSUE CALCIFICATION AND DISUSE OSTEOPOROSIS SO ACTA ASTRONAUTICA LA English DT Article; Proceedings Paper CT 41ST CONGRESS OF THE INTERNATIONAL ASTRONAUTICAL FEDERATION CY OCT 08-12, 1990 CL DRESDEN, GERMANY SP INT ASTRONAUT FEDERAT AB This paper emphasizes the devastating effects of displacement of calcium during space flight, due to increased bone turnover. RP SCHNEIDER, VS (reprint author), NASA,LYNDON B JOHNSON SPACE CTR,HOUSTON,TX 77058, USA. NR 0 TC 5 Z9 5 U1 1 U2 1 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0094-5765 J9 ACTA ASTRONAUT JI Acta Astronaut. PD FEB PY 1993 VL 29 IS 2 BP 139 EP 140 DI 10.1016/0094-5765(93)90031-Q PG 2 WC Engineering, Aerospace SC Engineering GA KQ753 UT WOS:A1993KQ75300007 PM 11543594 ER PT J AU SIMPSON, JM SCHUR, WW AF SIMPSON, JM SCHUR, WW TI CREEP-BEHAVIOR OF 6 MICROMETER LINEAR LOW-DENSITY POLYETHYLENE FILM SO ADVANCES IN SPACE RESEARCH-SERIES LA English DT Article AB Creep tests were performed to provide material characteristics for a 6.4 mum polyethelene film used to construct high altitude balloons. Results suggest simple power law relationships are adequate for stresses below about 4.83 MPa. C1 NASA, GODDARD SPACE FLIGHT CTR, WALLOPS FLIGHT FACIL, WALLOPS ISL, VA 23337 USA. NEW MEXICO STATE UNIV, PHYS SCI LAB, WALLOPS FLIGHT FACIL, WALLOPS ISL, VA 23337 USA. NR 1 TC 0 Z9 0 U1 0 U2 2 PU ELSEVIER SCI LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, OXON, ENGLAND SN 0273-1177 J9 ADV SPACE RES-SERIES JI Adv. Space Res. PD FEB PY 1993 VL 13 IS 2 BP 37 EP 40 DI 10.1016/0273-1177(93)90271-C PG 4 WC Astronomy & Astrophysics; Geosciences, Multidisciplinary; Meteorology & Atmospheric Sciences SC Astronomy & Astrophysics; Geology; Meteorology & Atmospheric Sciences GA JW711 UT WOS:A1993JW71100008 ER PT J AU SCHUR, WW SIMPSON, JM AF SCHUR, WW SIMPSON, JM TI FINITE-ELEMENT SOLUTION FOR THE STRUCTURAL BEHAVIOR OF A SCIENTIFIC BALLOON SO ADVANCES IN SPACE RESEARCH-SERIES LA English DT Article AB A finite element solution for the structural behavior of a scientific balloon has been obtained using a non-linear finite element code. The pneumatic skin is modelled by shell elements that are given a small artificial bending stiffness to overcome numerical problems yet the membrane solution remains unaffected. Validation of the analysis approach is provided through strain measurements on a small scale balloon that exhibits all essential features of a full scale balloon. C1 NEW MEXICO STATE UNIV, PHYS SCI LAB, WALLOPS FLIGHT FACIL, WALLOPS ISL, VA 23337 USA. NASA, GODDARD SPACE FLIGHT CTR, WALLOPS FLIGHT FACIL, WALLOPS ISL, VA 23337 USA. NR 2 TC 2 Z9 2 U1 0 U2 1 PU ELSEVIER SCI LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, OXON, ENGLAND SN 0273-1177 J9 ADV SPACE RES-SERIES JI Adv. Space Res. PD FEB PY 1993 VL 13 IS 2 BP 45 EP 48 DI 10.1016/0273-1177(93)90273-E PG 4 WC Astronomy & Astrophysics; Geosciences, Multidisciplinary; Meteorology & Atmospheric Sciences SC Astronomy & Astrophysics; Geology; Meteorology & Atmospheric Sciences GA JW711 UT WOS:A1993JW71100010 ER PT J AU CONRAD, GR AF CONRAD, GR TI RECENT REFINEMENTS AND INCREASED CAPABILITIES IN BALLOON VERTICAL PERFORMANCE ANALYSIS SO ADVANCES IN SPACE RESEARCH-SERIES LA English DT Article AB A balloon vertical performance analysis model named THERMTRAJ (THERMal TRAJectory) was developed in the late '70's. This model combines the vertical equation of motion with heat balance equations to predict the balloon altitude, vertical rate, skin and gas temperatures versus time. THERMTRAJ provided significant improvement in performance analysis capabilities, but suffers from inadequacies, e.g., 1) assumed spherical shape, with maximum volume fixed, and; 2) crude modeling of balloon solar absorptivity. Under the auspices of the National Aeronautics And Space Administration balloon research and development program, several improvements have been incorporated, including; a) redetermination of maximum volume and computation of balloon shape, and; b) continuous computation of gas loss due to small leaks and/or programmed venting. A method of modeling the solar radiation input which accounts for the higher absorptivity of load tapes and the presence of cap layers has also been incorporated. A significant increase in capability was achieved by incorporating generalized autoballast control algorithms. Current simulation/actual performance comparisons are presented for several balloon flights, and additional refinements under investigation are identified. C1 NEW MEXICO STATE UNIV, NASA, WALLOPS FLIGHT FACIL, PHYS SCI LAB, WALLOPS ISL, VA 23337 USA. NR 6 TC 1 Z9 1 U1 0 U2 1 PU ELSEVIER SCI LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, OXON, ENGLAND SN 0273-1177 J9 ADV SPACE RES-SERIES JI Adv. Space Res. PD FEB PY 1993 VL 13 IS 2 BP 49 EP 53 DI 10.1016/0273-1177(93)90274-F PG 5 WC Astronomy & Astrophysics; Geosciences, Multidisciplinary; Meteorology & Atmospheric Sciences SC Astronomy & Astrophysics; Geology; Meteorology & Atmospheric Sciences GA JW711 UT WOS:A1993JW71100011 ER PT J AU ROBBINS, E MARTONE, M AF ROBBINS, E MARTONE, M TI DETERMINATION OF BALLOON GAS MASS AND REVISED ESTIMATES OF DRAG AND VIRTUAL MASS COEFFICIENTS SO ADVANCES IN SPACE RESEARCH-SERIES LA English DT Article AB Ascent modeling of scientific balloon missions is particularly sensitive to accurate knowledge of the balloon lifting gas mass. Transient distortions of the balloon body effectively increase drag beyond classical solid body data. Further, experimenters have reported an increase in virtual mass with developing flow relative to the accepted inviscid determination at incipient flow. In support of the National Aeronautics and Space Administration (NASA) Balloon Program, small scale balloons (175 m3) were flown with varying lifting gas and total system mass. Stow Away Special (SAS) instrument packages were developed to measure and record acceleration and temperature data during these tests. Top fitting and instrument payload accelerations were measured from launch to steady state ascent and through ballast drop transients. The development of the small (5x7.5x15 m3), light weight (.5 kg.), self-powered SAS is discussed along with mathematical models developed to determine gas mass, drag and virtual mass coefficients. C1 NEW MEXICO STATE UNIV, NASA, WALLOPS FLIGHT FACIL, PHYS SCI LAB, WALLOPS ISL, VA 23337 USA. NR 2 TC 1 Z9 1 U1 0 U2 1 PU ELSEVIER SCI LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, OXON, ENGLAND SN 0273-1177 J9 ADV SPACE RES-SERIES JI Adv. Space Res. PD FEB PY 1993 VL 13 IS 2 BP 55 EP 57 DI 10.1016/0273-1177(93)90275-G PG 3 WC Astronomy & Astrophysics; Geosciences, Multidisciplinary; Meteorology & Atmospheric Sciences SC Astronomy & Astrophysics; Geology; Meteorology & Atmospheric Sciences GA JW711 UT WOS:A1993JW71100012 ER PT J AU SMITH, IS AF SMITH, IS TI NASA BALLOON DESIGN AND FLIGHT - PHILOSOPHY AND CRITERIA SO ADVANCES IN SPACE RESEARCH-SERIES LA English DT Article AB The catastrophic balloon failures during the first half of the 1980's were devastating to the USA scientific ballooning community as well as balloon users from other countries. Confidence in the balloons reached an all time low with success rates of 50% or lower being experienced across all payload ranges. An intensive investigation by the USA National Aeronautics and Space Administration (NASA) was initiated in 1983 to identify the cause(s) of the failures. Findings from the investigation resulted with NASA implementing a new balloon design and flight philosophy for all NASA scientific balloons. The NASA Balloon Program philosophy and criteria for scientific balloon design and flight are presented. C1 NASA, GODDARD SPACE FLIGHT CTR, WALLOPS FLIGHT FACIL, WALLOPS ISL, VA 23337 USA. NR 9 TC 1 Z9 1 U1 0 U2 2 PU ELSEVIER SCI LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, OXON, ENGLAND SN 0273-1177 J9 ADV SPACE RES-SERIES JI Adv. Space Res. PD FEB PY 1993 VL 13 IS 2 BP 59 EP 62 DI 10.1016/0273-1177(93)90276-H PG 4 WC Astronomy & Astrophysics; Geosciences, Multidisciplinary; Meteorology & Atmospheric Sciences SC Astronomy & Astrophysics; Geology; Meteorology & Atmospheric Sciences GA JW711 UT WOS:A1993JW71100013 ER PT J AU NEEDLEMAN, HC NOCK, RS BAWCOM, DW AF NEEDLEMAN, HC NOCK, RS BAWCOM, DW TI STATUS OF THE NASA BALLOON PROGRAM SO ADVANCES IN SPACE RESEARCH-SERIES LA English DT Article AB In the early 1980's the U.S. National Aeronautics and Space Administration (NASA) Balloon Program was faced with a problem of catastrophic balloon failures. In 1986 a balloon recovery program was initiated. This program included qualification of new balloon films, and investigations into materials, processing, structures and performance of balloons. This recovery program has been very successful. To date, more than 100 balloons manufactured of newly developed films have been flown with unprecedented success. There has been much progress made across the spectrum of balloon related disciplines. A new design philosophy has been developed and is being used for all NASA balloons. An updated balloon reliability and quality assurance program is in effect. The long duration balloon development project has been initiated with the first flight test having been conducted in December 1989 from Antarctica. A comprehensive research and development (R&D) effort has been initiated and is progressing well. The progress, status and future plans for these and other aspects of the NASA program, along with a description of the comprehensive balloon R&D activity, will be presented. C1 NASA, GODDARD SPACE FLIGHT CTR, WALLOPS FLIGHT FACIL, WALLOPS ISL, VA 23337 USA. NEW MEXICO STATE UNIV, PHYS SCI LAB, NATL SCI BALLOON FACIL, PALESTINE, TX 75801 USA. NR 14 TC 1 Z9 1 U1 0 U2 1 PU ELSEVIER SCI LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, OXON, ENGLAND SN 0273-1177 J9 ADV SPACE RES-SERIES JI Adv. Space Res. PD FEB PY 1993 VL 13 IS 2 BP 69 EP 76 DI 10.1016/0273-1177(93)90278-J PG 8 WC Astronomy & Astrophysics; Geosciences, Multidisciplinary; Meteorology & Atmospheric Sciences SC Astronomy & Astrophysics; Geology; Meteorology & Atmospheric Sciences GA JW711 UT WOS:A1993JW71100015 ER PT J AU STUCHLIK, D CRADDOCK, W AF STUCHLIK, D CRADDOCK, W TI NASA LONG DURATION BALLOON CAPABILITY DEVELOPMENT PROJECT SO ADVANCES IN SPACE RESEARCH-SERIES LA English DT Article AB The potential benefits of a Long Duration Balloon (LDB) capability have long been recognized and some modest efforts have previously been undertaken by the National Center for Atmospheric Research (NCAR), the National Scientific Balloon Facility (NSBF), et.al., going back to the late 1960's. In 1988, the National Aeronautics and Space Administration (NASA) made a decision to dedicate significant resources toward this effort and a technical and management approach was established. The objective of the project is to develop a near global LDB capability for both Antarctic and mid-latitude applications, including the required telecommunications, navigation and positioning, power, data processing and control systems necessary to conduct flights of scientific experiments weighing 1500 pounds or more on conventional balloons for periods of up to three weeks. The first operational use of the new capability is planned in support of Solar Max experiments in Antarctica during the 1991-1992 austral summer. Development of the Antarctica support system configuration has been initiated and the first test flight was conducted from McMurdo Station in December 1989-January 1990. The progress, status and future plans for development of the new LDB capability will be discussed. C1 NASA, GODDARD SPACE FLIGHT CTR, WALLOPS FLIGHT FACIL, WALLOPS ISL, VA 23337 USA. NEW MEXICO STATE UNIV, PHYS SCI LAB, LAS CRUCES, NM 88003 USA. NR 0 TC 0 Z9 0 U1 0 U2 1 PU ELSEVIER SCI LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, OXON, ENGLAND SN 0273-1177 J9 ADV SPACE RES-SERIES JI Adv. Space Res. PD FEB PY 1993 VL 13 IS 2 BP 115 EP 118 DI 10.1016/0273-1177(93)90283-H PG 4 WC Astronomy & Astrophysics; Geosciences, Multidisciplinary; Meteorology & Atmospheric Sciences SC Astronomy & Astrophysics; Geology; Meteorology & Atmospheric Sciences GA JW711 UT WOS:A1993JW71100020 ER PT J AU BLAMONT, J BOLOH, L KERZHANOVICH, V KOGAN, L KURGANSKY, M LINKIN, V MATVEENKO, L ROY, M PATSAEV, D PICHKHADZE, K HILDEBRAND, C PRESTON, R YOUNG, T AF BLAMONT, J BOLOH, L KERZHANOVICH, V KOGAN, L KURGANSKY, M LINKIN, V MATVEENKO, L ROY, M PATSAEV, D PICHKHADZE, K HILDEBRAND, C PRESTON, R YOUNG, T TI BALLOONS ON PLANET VENUS - FINAL RESULTS SO ADVANCES IN SPACE RESEARCH-SERIES LA English DT Article AB On June 11 and 15, 1985 two packages with balloons have been inserted in the atmosphere of Venus from the Soviet VEGA landing modules. This paper summarizes the pressure, temperature, wind illumination and backscattering data from the balloons. C1 CTR NATL ETUD SPATIALES, F-75039 PARIS 01, FRANCE. ACAD SCI MOSCOW, INST SPACE RES, MOSCOW, USSR. BABAKIN TEST & RES CTR, MOSCOW, USSR. JET PROP LAB, PASADENA, CA 91109 USA. NASA, AMES RES CTR, MOFFETT FIELD, CA 94035 USA. NR 7 TC 6 Z9 6 U1 0 U2 0 PU ELSEVIER SCI LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, OXON, ENGLAND SN 0273-1177 J9 ADV SPACE RES-SERIES JI Adv. Space Res. PD FEB PY 1993 VL 13 IS 2 BP 145 EP 152 DI 10.1016/0273-1177(93)90289-N PG 8 WC Astronomy & Astrophysics; Geosciences, Multidisciplinary; Meteorology & Atmospheric Sciences SC Astronomy & Astrophysics; Geology; Meteorology & Atmospheric Sciences GA JW711 UT WOS:A1993JW71100026 ER PT J AU ROBBINS, E AF ROBBINS, E TI SCIENTIFIC BALLOONING PAYLOAD TERMINATION LOADS SO ADVANCES IN SPACE RESEARCH-SERIES LA English DT Article AB NASA's high altitude balloon borne scientific payloads are typically suspended from a deployed flat circular parachute. At flight termination, the recovery train is pyrotechnically separated at the parachute apex and balloon nadir interface. The release of elastic energy stored in the parachute at zero initial virtical velocity in the rarefied atmosphere produces high canopy opening forces that subject the gondola to potentially damaging shock loads. Data from terminations occuring at altitudes to 40 km with payloads up to 2500 kg on parachutes up to 40 m in diameter are presented. Measured loads are markedly larger than encountered via packed parachute deployment for similar canopy loadings. Canopy inflation is significantly surpressed in the early stages and then accelerated during final blossoming. Data interpretation and behavioral phenomena are discussed along with proposed shock attenuation techniques. C1 NEW MEXICO STATE UNIV, NASA, WALLOPS FLIGHT FACIL, PHYS SCI LAB, WALLOPS ISL, VA 23337 USA. NR 5 TC 1 Z9 1 U1 0 U2 1 PU ELSEVIER SCI LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, OXON, ENGLAND SN 0273-1177 J9 ADV SPACE RES-SERIES JI Adv. Space Res. PD FEB PY 1993 VL 13 IS 2 BP 181 EP 184 DI 10.1016/0273-1177(93)90296-N PG 4 WC Astronomy & Astrophysics; Geosciences, Multidisciplinary; Meteorology & Atmospheric Sciences SC Astronomy & Astrophysics; Geology; Meteorology & Atmospheric Sciences GA JW711 UT WOS:A1993JW71100033 ER PT J AU NOOR, AK VENNERI, SL AF NOOR, AK VENNERI, SL TI STRUCTURING THE FUTURE OF AEROSPACE SO AEROSPACE AMERICA LA English DT Article RP NOOR, AK (reprint author), NASA,LANGLEY RES CTR,HAMPTON,VA 23665, USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER INST AERONAUT ASTRONAUT PI RESTON PA 1801 ALEXANDER BELL DRIVE, STE 500, RESTON, VA 22091 SN 0740-722X J9 AEROSPACE AM JI Aerosp. Am. PD FEB PY 1993 VL 31 IS 2 BP 14 EP & PG 0 WC Engineering, Aerospace SC Engineering GA KK891 UT WOS:A1993KK89100006 ER PT J AU HOUSNER, JM PINSON, LD AF HOUSNER, JM PINSON, LD TI NASA CST AIDS UNITED-STATES INDUSTRY SO AEROSPACE AMERICA LA English DT Article RP HOUSNER, JM (reprint author), NASA,LANGLEY RES CTR,COMP MECH BRANCH,HAMPTON,VA 23665, USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER INST AERONAUT ASTRONAUT PI RESTON PA 1801 ALEXANDER BELL DRIVE, STE 500, RESTON, VA 22091 SN 0740-722X J9 AEROSPACE AM JI Aerosp. Am. PD FEB PY 1993 VL 31 IS 2 BP 20 EP 25 PG 6 WC Engineering, Aerospace SC Engineering GA KK891 UT WOS:A1993KK89100007 ER PT J AU GOORJIAN, PM OBAYASHI, S AF GOORJIAN, PM OBAYASHI, S TI HIGHER-ORDER ACCURACY FOR UPWIND METHODS BY USING THE COMPATIBILITY EQUATIONS SO AIAA JOURNAL LA English DT Article ID EULER EQUATIONS; SCHEMES AB A new algorithm has been developed for obtaining higher-order accuracy in upwind schemes for the Euler and Navier-Stokes equations. In this method, the compatibility relations for the Euler equations are used to construct formulas for the higher-order interpolates. By using these formulas, computed results are obtained for steady, inviscid flow through a nozzle and also steady, inviscid, and viscous flow over an airfoil. This approach provides an alternative to total-variation-diminishing and essentially nonoscillatory schemes. RP GOORJIAN, PM (reprint author), NASA,AMES RES CTR,MOFFETT FIELD,CA 94035, USA. NR 18 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 0001-1452 J9 AIAA J JI AIAA J. PD FEB PY 1993 VL 31 IS 2 BP 251 EP 256 DI 10.2514/3.11661 PG 6 WC Engineering, Aerospace SC Engineering GA KP434 UT WOS:A1993KP43400003 ER PT J AU WENDT, BJ GREBER, I HINGST, WR AF WENDT, BJ GREBER, I HINGST, WR TI STRUCTURE AND DEVELOPMENT OF STREAMWISE VORTEX ARRAYS EMBEDDED IN A TURBULENT BOUNDARY-LAYER SO AIAA JOURNAL LA English DT Article AB The results of an experimental investigation of the structure and development of streamwise vortices embedded in a turbulent boundary layer are presented. Measurements of secondary velocity in the crossplane are used to characterize the vortex array structure. Measurements in the crossplane at two streamwise locations characterize the downstream development of this structure. The initial spacing between vortices is found to strongly influence this development. Enhanced circulation decay is found to occur in arrays of closely spaced vortices. Evidence suggests this decay is due to the merging of neighboring counter-rotating vortex cores. C1 NASA,LEWIS RES CTR,CLEVELAND,OH 44135. RP WENDT, BJ (reprint author), CASE WESTERN RESERVE UNIV,DEPT MECH & AEROSP ENGN,MAIL STOP 5-11,21000 BROOKPARK RD,CLEVELAND,OH 44106, USA. NR 10 TC 18 Z9 18 U1 0 U2 1 PU AMER INST AERONAUT ASTRONAUT PI RESTON PA 1801 ALEXANDER BELL DRIVE, STE 500, RESTON, VA 22091 SN 0001-1452 J9 AIAA J JI AIAA J. PD FEB PY 1993 VL 31 IS 2 BP 319 EP 325 DI 10.2514/3.11670 PG 7 WC Engineering, Aerospace SC Engineering GA KP434 UT WOS:A1993KP43400012 ER PT J AU NOOR, AK TANNER, JA PETERS, JM AF NOOR, AK TANNER, JA PETERS, JM TI REDUCED-BASIS TECHNIQUE FOR EVALUATING THE SENSITIVITY COEFFICIENTS OF THE NONLINEAR TIRE RESPONSE SO AIAA JOURNAL LA English DT Article ID SYSTEMS AB An efficient reduced-basis technique is presented for calculating the sensitivity of nonlinear tire response to variations in the design variables. The tire is discretized by using three-field mixed finite element models. The vector of structural response and its first- and second-order sensitivity coefficients (derivatives with respect to design variables) are each expressed as linear combinations of a small number of basis (or global approximation) vectors. The Bubnov-Galerkin technique is then used to approximate each of the finite element equations governing the response and the sensitivity coefficients, by a small number of algebraic equations in the amplitudes of these vectors. Path derivatives (derivatives of the response vector with respect to path parameters, e.g., load parameters) are used as basis vectors for approximating the response. A combination of the path derivatives and their derivatives with respect to the design variables is used for approximating the sensitivity coefficients. The potential of the proposed technique is discussed and its effectiveness is demonstrated by means of a numerical example of the Space Shuttle nose-gear tire subjected to uniform inflation pressure. The design variables are selected to be the material properties of the cord and rubber, as well as the cord diameters, end counts, and angles. C1 UNIV VIRGINIA,CHARLOTTESVILLE,VA 22903. UNIV VIRGINIA,CTR COMPUT STRUCT TECHNOL,CHARLOTTESVILLE,VA 22903. RP NOOR, AK (reprint author), NASA,LANGLEY RES CTR,LANDING & IMPACT DYNAM BRANCH,HAMPTON,VA 23681, USA. NR 15 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 0001-1452 J9 AIAA J JI AIAA J. PD FEB PY 1993 VL 31 IS 2 BP 370 EP 376 DI 10.2514/3.11677 PG 7 WC Engineering, Aerospace SC Engineering GA KP434 UT WOS:A1993KP43400019 ER PT J AU NARAYAN, JR AF NARAYAN, JR TI 2-EQUATION TURBULENCE MODEL FOR COMPRESSIBLE REACTING FLOWS SO AIAA JOURNAL LA English DT Note RP NARAYAN, JR (reprint author), NASA,AMES RES CTR,MCAT INST,MOFFETT FIELD,CA 94035, USA. NR 9 TC 1 Z9 1 U1 0 U2 1 PU AMER INST AERONAUT ASTRONAUT PI RESTON PA 1801 ALEXANDER BELL DRIVE, STE 500, RESTON, VA 22091 SN 0001-1452 J9 AIAA J JI AIAA J. PD FEB PY 1993 VL 31 IS 2 BP 398 EP 401 DI 10.2514/3.11681 PG 4 WC Engineering, Aerospace SC Engineering GA KP434 UT WOS:A1993KP43400023 ER PT J AU BOLLE, HJ ANDRE, JC ARRUE, JL BARTH, HK BESSEMOULIN, P BRASA, A DEBRUIN, HAR CRUCES, J DUGDALE, G ENGMAN, ET EVANS, DL FANTECHI, R FIEDLER, F VANDEGRIEND, A IMESON, AC JOCHUM, A KABAT, P KRATZSCH, T LAGOUARDE, JP LANGER, I LLAMAS, R LOPEZBAEZA, E MIRALLES, JM MUNIOSGUREN, LS NERRY, F NOILHAN, J OLIVER, HR ROTH, R SAATCHI, SS DIAZ, JS OLALLA, MD SHUTTLEWORTH, WJ SOGAARD, H STRICKER, H THORNES, J VAUCLIN, M WICKLAND, D AF BOLLE, HJ ANDRE, JC ARRUE, JL BARTH, HK BESSEMOULIN, P BRASA, A DEBRUIN, HAR CRUCES, J DUGDALE, G ENGMAN, ET EVANS, DL FANTECHI, R FIEDLER, F VANDEGRIEND, A IMESON, AC JOCHUM, A KABAT, P KRATZSCH, T LAGOUARDE, JP LANGER, I LLAMAS, R LOPEZBAEZA, E MIRALLES, JM MUNIOSGUREN, LS NERRY, F NOILHAN, J OLIVER, HR ROTH, R SAATCHI, SS DIAZ, JS OLALLA, MD SHUTTLEWORTH, WJ SOGAARD, H STRICKER, H THORNES, J VAUCLIN, M WICKLAND, D TI EFEDA - EUROPEAN FIELD EXPERIMENT IN A DESERTIFICATION-THREATENED AREA SO ANNALES GEOPHYSICAE-ATMOSPHERES HYDROSPHERES AND SPACE SCIENCES LA English DT Article ID ADVANCED SURFACE PARAMETERIZATION; MESOBETA-SCALE MODEL; HAPEX-MOBILHY DATA; LAND-SURFACES; EVAPORATION; SENSITIVITY; SIMULATION; VEGETATION; BUDGET AB During June 1991 more than 30 scientific teams worked in Castilla-La Mancha, Spain, studying the energy and water transfer processes between soil, vegetation and the atmosphere in semi-arid conditions within the co-ordinated European research project EFEDA (European Field Experiment in Desertification-threatened Areas). Measurements were made from the microscale (e.g. measurements on single plants) up to a scale compatible with the grid size of global models. For this purpose three sites were selected 70 km apart and heavily instrumented at a scale in the order of 30 km2. Aircraft missions, satellite data and movable equipment were deployed to provide a bridge to the larger scale. This paper gives a description of the experimental design along with some of the preliminary results of this successful experiment. C1 CNRM,F-31057 TOULOUSE,FRANCE. COLAB CIENT SCIC,ESTAC EXPTL,E-50080 ZARAGOZA,SPAIN. UNIV GESAMTHSCH PADERBORN,INST GEOG,W-4790 PADERBORN,GERMANY. UNIV CASTILLA LA MANCHA,ESCUELA POLITECN,E-02006 ALBACETE,SPAIN. AGR UNIV WAGENINGEN,DEPT METEOROL,6701 AP WAGENINGEN,NETHERLANDS. UNIV READING,DEPT METEOROL,READING RG6 2AU,ENGLAND. NASA,GODDARD SPACE FLIGHT CTR,GSFC,GREENBELT,MD 20771. JET PROP LAB,PASADENA,CA 91109. CEC,DIR SCI RES & DEV,B-1049 BRUSSELS,BELGIUM. UNIV KARLSRUHE,INST METEOROL & KLIMAFORSCH,W-7500 KARLSRUHE,GERMANY. FREE UNIV AMSTERDAM,INST EARTH SCI,1081 HV AMSTERDAM,NETHERLANDS. UNIV AMSTERDAM,DEPT PHYS GEOG & SOIL SCI,1018 AMSTERDAM,NETHERLANDS. DLR,INST PHYS ATMOSPHARE,W-8031 WESSELING,GERMANY. WINAND STARING CTR,DEPT AGROHYDROL,6700 AC WAGENINGEN,NETHERLANDS. UNIV HANNOVER,INST METEOR & KLIMAT,W-3000 HANNOVER 21,GERMANY. INRA,BIOCLIMATOL STN,F-33883 VILLENAVE DORNON,FRANCE. UNIV COMPLUTENSE MADRID,DEPT GEODINAM,E-28040 MADRID,SPAIN. UNIV VALENCIA,FAC FIS,DEPT TERMOL,E-46100 BURJASSOT,SPAIN. INM,CTR METEOROL ZONAL MURCIA,E-30071 MURCIA,SPAIN. UNIV STRASBOURG 1,GROUPEMENT SCI TELEDETECT SPATIALE,F-67070 STRASBOURG,FRANCE. INST HYDROL,WALLINGFORD OX10 8BB,OXON,ENGLAND. UNIV VALENCIA,FAC FARM,E-46010 VALENCIA,SPAIN. UNIV COPENHAGEN,INST GEOG,DK-1350 COPENHAGEN,DENMARK. AGR UNIV WAGENINGEN,DEPT HYDR SOIL PHYS & HYDRAUL,6709 PA WAGENINGEN,NETHERLANDS. UNIV LONDON KINGS COLL,DEPT GEOG,LONDON WC2R 2LS,ENGLAND. NASA,HEADQUARTERS,WASHINGTON,DC 20546. INST MECAN GRENOBLE,HYDROL GRP,F-38041 GRENOBLE,FRANCE. RP BOLLE, HJ (reprint author), FREE UNIV BERLIN,INST METEOROL,CARL HEINRICH BECKER WEG 6-10,W-1000 BERLIN 41,GERMANY. RI Arrue, Jose Luis/G-4056-2011; Brasa Ramos, Antonio/F-6500-2015 OI Arrue, Jose Luis/0000-0002-5855-9240; Brasa Ramos, Antonio/0000-0001-6852-3746 NR 29 TC 157 Z9 177 U1 1 U2 14 PU SPRINGER VERLAG PI NEW YORK PA 175 FIFTH AVE, NEW YORK, NY 10010 SN 0992-7689 J9 ANN GEOPHYS JI Ann. Geophys.-Atmos. Hydrospheres Space Sci. PD FEB-MAR PY 1993 VL 11 IS 2-3 BP 173 EP 189 PG 17 WC Astronomy & Astrophysics; Geosciences, Multidisciplinary; Meteorology & Atmospheric Sciences SC Astronomy & Astrophysics; Geology; Meteorology & Atmospheric Sciences GA LC270 UT WOS:A1993LC27000011 ER PT J AU CALLIS, LB NATARAJAN, M AF CALLIS, LB NATARAJAN, M TI STRATOSPHERIC EVIDENCE OF RELATIVISTIC ELECTRON-PRECIPITATION - COMMENT SO ANNALES GEOPHYSICAE-ATMOSPHERES HYDROSPHERES AND SPACE SCIENCES LA English DT Note ID SOLAR PROTON EVENTS; MIDDLE ATMOSPHERE; OZONE DEPLETION; CYCLE-21 C1 SAIC CORP,HAMPTON,VA 23666. RP CALLIS, LB (reprint author), NASA,LANGLEY RES CTR,DIV ATMOSPHER SCI,HAMPTON,VA 23681, USA. NR 13 TC 0 Z9 0 U1 0 U2 0 PU SPRINGER VERLAG PI NEW YORK PA 175 FIFTH AVE, NEW YORK, NY 10010 SN 0992-7689 J9 ANN GEOPHYS JI Ann. Geophys.-Atmos. Hydrospheres Space Sci. PD FEB-MAR PY 1993 VL 11 IS 2-3 BP 221 EP 223 PG 3 WC Astronomy & Astrophysics; Geosciences, Multidisciplinary; Meteorology & Atmospheric Sciences SC Astronomy & Astrophysics; Geology; Meteorology & Atmospheric Sciences GA LC270 UT WOS:A1993LC27000016 ER PT J AU AIKIN, AC AF AIKIN, AC TI STRATOSPHERIC EVIDENCE OF RELATIVISTIC ELECTRON-PRECIPITATION - REPLY SO ANNALES GEOPHYSICAE-ATMOSPHERES HYDROSPHERES AND SPACE SCIENCES LA English DT Note ID SOLAR PROTON EVENTS; OZONE; MESOSPHERE RP AIKIN, AC (reprint author), NASA,GODDARD SPACE FLIGHT CTR,CODE 916,GREENBELT,MD 20771, USA. NR 10 TC 0 Z9 0 U1 0 U2 0 PU SPRINGER VERLAG PI NEW YORK PA 175 FIFTH AVE, NEW YORK, NY 10010 SN 0992-7689 J9 ANN GEOPHYS JI Ann. Geophys.-Atmos. Hydrospheres Space Sci. PD FEB-MAR PY 1993 VL 11 IS 2-3 BP 224 EP 225 PG 2 WC Astronomy & Astrophysics; Geosciences, Multidisciplinary; Meteorology & Atmospheric Sciences SC Astronomy & Astrophysics; Geology; Meteorology & Atmospheric Sciences GA LC270 UT WOS:A1993LC27000017 ER PT J AU BISWAS, R FLAHERTY, JE ARNEY, DC AF BISWAS, R FLAHERTY, JE ARNEY, DC TI AN ADAPTIVE MESH-MOVING AND REFINEMENT PROCEDURE FOR ONE-DIMENSIONAL CONSERVATION-LAWS SO APPLIED NUMERICAL MATHEMATICS LA English DT Article ID FINITE-ELEMENT METHOD; PARTIAL-DIFFERENTIAL EQUATIONS; LOCAL REFINEMENT; PARABOLIC-SYSTEMS AB We examine the performance of an adaptive mesh-moving and/or local mesh refinement procedure for the finite difference solution of one-dimensional hyperbolic systems of conservation laws. Adaptive motion of a base mesh is designed to isolate spatially distinct phenomena, and recursive local refinement of the time step and cells of the stationary or moving base mesh is performed in regions where a refinement indicator exceeds a prescribed tolerance. These adaptive procedures are incorporated into a computer code that includes a MacCormack finite difference scheme with Davis' artificial viscosity model and a discretization error estimate based on Richardson's extrapolation. Experiments are conducted on three problems in order to quantify the advantages of adaptive techniques relative to uniform mesh computations and the relative benefits of mesh moving and refinement. Key results indicate that local mesh refinement, with and without mesh moving, can provide reliable solutions at much lower computational cost than possible on uniform meshes; that mesh motion can be used to improve the results of uniform mesh solutions for a modest computational effort; that the cost of managing the tree data structure associated with refinement is small; and that a combination of mesh motion and refinement reliably produces solutions for the least cost per unit accuracy. C1 RENSSELAER POLYTECH INST,DEPT COMP SCI,TROY,NY 12180. US MIL ACAD,DEPT MATH,W POINT,NY 10996. RP BISWAS, R (reprint author), NASA,AMES RES CTR,RIACS,MAIL STOP TO45-1,MOFFETT FIELD,CA 94035, USA. NR 28 TC 8 Z9 8 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0168-9274 J9 APPL NUMER MATH JI Appl. Numer. Math. PD FEB PY 1993 VL 11 IS 4 BP 259 EP 282 DI 10.1016/0168-9274(93)90010-O PG 24 WC Mathematics, Applied SC Mathematics GA KJ231 UT WOS:A1993KJ23100001 ER PT J AU DAVIS, DS MUSHOTZKY, RF AF DAVIS, DS MUSHOTZKY, RF TI X-RAY SUBSTRUCTURE IN A1656 AND A2256 SO ASTRONOMICAL JOURNAL LA English DT Article ID COMA CLUSTER; MASS-DISTRIBUTION; GALAXIES A2256; VIRGO CLUSTER; RICH CLUSTERS; EVOLUTION; MORPHOLOGY; EINSTEIN; SPECTRA; GAS AB We report the confirmation of x-ray substructure in two rich clusters of galaxies, A1656 (Coma) and A2256. Using data from the Einstein Observatory imaging proportional counter, we present a technique of fitting the cluster profile and searching for contributions to the x-ray emission from small regions within the cluster. Using this method we find substructure in both A1656 and A2256 while simultaneously fitting the cluster profile. We obtain the ellipticity and position angle for both clusters as a function of radius and find that both have ellipticity and position angles which vary with radius. We interpret the existence of substructure along with the variable ellipticity and position angle as evidence for a recent merger in both of these clusters. C1 UNIV MARYLAND,DEPT ASTRON,COLL PK,MD 20742. RP DAVIS, DS (reprint author), NASA,GODDARD SPACE FLIGHT CTR,HIGH ENERGY ASTROPHYS LAB,GREENBELT,MD 20771, USA. NR 41 TC 44 Z9 44 U1 0 U2 0 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0004-6256 J9 ASTRON J JI Astron. J. PD FEB PY 1993 VL 105 IS 2 BP 409 EP 416 DI 10.1086/116439 PG 8 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA KK747 UT WOS:A1993KK74700002 ER PT J AU SAHAI, R BIEGING, JH AF SAHAI, R BIEGING, JH TI INTERFEROMETRIC OBSERVATIONS OF NON-MASER SIO EMISSION FROM CIRCUMSTELLAR ENVELOPES OF AGB STARS - ACCELERATION REGIONS AND SIO DEPLETION SO ASTRONOMICAL JOURNAL LA English DT Article ID EVOLVED STARS; RED GIANTS; CO AB We have obtained high (3''-4'') and medium (7''-9'') resolution images of the SiO J=2-1 (V=0) emission from the circumstellar envelopes (CSEs) of three oxygen-rich Mira variables, chi Cyg, RX Boo, and IK Tau. The SiO images are roughly circular, implying that the CSEs are largely spherically symmetric on angular-size scales of almost-equal-to 3''-9''. The emission is strongly centrally peaked, but shows a non-negligible amount of extended, low surface-brightness emission. The intrinsic SiO brightness distribution, as a function of radius, is best approximated by a power-law, rather than a Gaussian or exponential function, for our sources. The observed angular half-maximum intensity source radius is nearly independent of LSR velocity for all three CSEs. This behavior is a characteristic feature of power-law distributions, which are scale-free, rather than Gaussian or exponential ones, which have well-defined scale sizes. Detailed radiative transfer/excitation calculations, coupled with a kinematic model of gas acceleration by radiation pressure on dust grains have been used to successfully reproduce the characteristic properties of the observed SiO emission. We find that the emission can be understood using normal radial acceleration models, i.e., those in which the outflow velocity reaches half its terminal value within about 10 stellar radii. Very large-scale acceleration (up to almost-equal-to 100 stellar radii) is not required, contrary to a recent model proposed by Lucas et al. [A&A, 262, 491 (1992)]. In chi Cyg and RX Boo, the line-profiles are rounded, typical of optically-thick emission from a spherical envelope expanding with a constant velocity. The presence of an additional (kinematically) narrower central component in the line profiles observed toward IK Tau (both with high and medium resolution observations), implies the existence of an inner circumstellar shell with a significantly smaller expansion velocity than the extended envelope. The radial distribution of the SiO abundance, from small (10(15) cm) to large radii (> 10(16) cm), is constrained by the observed half-maximum intensity source sizes, and ratios of the source fluxes in small and large beams. We find that a rapid depletion of SiO from the gas phase must occur at radii larger than about (1-2) 10(15) cm, initially by the process of adhesion onto dust grains, followed by photodissociation by the interstellar UV. IK Tau has a higher average fraction (by a factor 2.7) of SiO left over in the extended envelope, as compared to chi Cyg and RX Boo, which are similar in this respect. Depending on the stellar mass-loss rates and distances, the initial SiO abundance in the circumstellar envelopes of I K Ta Li, chi Cyg, and RX Boo, is about ( 1 - few) 10(-5). C1 CHALMERS UNIV TECHNOL,INST THEORET PHYS,DEPT ASTRON & ASTROPHYS,S-41296 GOTHENBURG,SWEDEN. UNIV ARIZONA,STEWARD OBSERV,TUCSON,AZ 85721. RP SAHAI, R (reprint author), JET PROP LAB,PASADENA,CA 91109, USA. NR 21 TC 37 Z9 37 U1 0 U2 0 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0004-6256 J9 ASTRON J JI Astron. J. PD FEB PY 1993 VL 105 IS 2 BP 595 EP 607 DI 10.1086/116456 PG 13 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA KK747 UT WOS:A1993KK74700019 ER PT J AU SEKANINA, Z AF SEKANINA, Z TI EFFECTS OF DISCRETE-SOURCE OUTGASSING ON MOTIONS OF PERIODIC COMETS AND DISCONTINUOUS ORBITAL ANOMALIES SO ASTRONOMICAL JOURNAL LA English DT Article ID NONGRAVITATIONAL FORCES; PRECESSION MODEL; NUCLEUS PRECESSION; ENCKE; EVOLUTION; ASYMMETRY; HALLEY; KOPFF AB Almost 300 determinations of the Style II nongravitational parameters A1 and A2 have been collected from published orbital solutions for 43 periodic comets observed at five or more apparitions. Upon integrating the law for the nongravitational forces (assumed to be symmetrical with respect to perihelion) over the orbital period of a comet, A2 and A1 measure, respectively, the total effects of these forces on the comet's mean motion and its longitude of perihelion. Interpreting the perturbations as products of the momentum transferred to the comet's mass by sublimation of water ice from a small, localized source on the rotating nucleus, isoline maps of A2 and A1 are presented for a baseline model as functions of the parameters of the inertially fixed spin vector and the source's location-dependent thrust angle. The baseline model assumes the absence of sublimation lags, in which case the perturbations are independent of the sense of nucleus rotation and the nongravitational parameters for any given values of the comet's mass, the outgassing area, and the outflow velocity can be scaled. Both the radial and the transverse components contribute, in general, significantly to the perturbation of the mean motion. Whether the comet is accelerated or decelerated is determined by the position of its spin vector and by the source's hemispherical location. An acceleration correlates with a greater production of water before perihelion and a deceleration with a greater production after perihelion, in substantial agreement with evidence presented by Festou et al. [Nature, 345, 235 (1990)] and [Asteroids, Comets, Meteors III (Uppsala University, Uppsala, 1990), p. 313] Contrary to their conclusions, however, no universal relationship is found between the magnitudes of the dynamical effect and the production asymmetry. The parameters A1 and A2 for a collection of sources are equal to the sum of their values for the individual contributors, thus depending upon the source distribution. The model is consistent with even the most extreme among the detected perturbations, including the instances of rapid temporal changes in A2 and the discontinuous orbital anomalies, which are interpreted as products of a sudden redistribution of the transferred momentum due to episodic activation of short-lived sources. It appears that lifetimes of active regions vary considerably from case to case and that forced precession of the nucleus strongly influences the comet's activity pattern. RP SEKANINA, Z (reprint author), JET PROP LAB,PASADENA,CA 91109, USA. NR 81 TC 27 Z9 27 U1 0 U2 0 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0004-6256 J9 ASTRON J JI Astron. J. PD FEB PY 1993 VL 105 IS 2 BP 702 EP 735 DI 10.1086/116468 PG 34 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA KK747 UT WOS:A1993KK74700031 ER PT J AU HEITHAUSEN, A STACY, JG DEVRIES, HW MEBOLD, U THADDEUS, P AF HEITHAUSEN, A STACY, JG DEVRIES, HW MEBOLD, U THADDEUS, P TI A COMPOSITE LARGE-SCALE CO SURVEY AT HIGH GALACTIC LATITUDES IN THE 2ND QUADRANT SO ASTRONOMY & ASTROPHYSICS LA English DT Article DE INTERSTELLAR MEDIUM, CLOUDS; INTERSTELLAR MEDIUM, MOLECULES; INTERSTELLAR MEDIUM, REFLECTION NEBULAE; RADIO LINES, MOLECULES ID MOLECULAR CLOUDS; MILKY-WAY; INFRARED CIRRUS; ABUNDANCES AB Surveys undertaken in the 2nd quadrant of the Galaxy with the CfA 1.2 m telescope have been combined to produce a map covering about 620 deg2 in the 2.6 mm CO(J = 1 bar arrow pointing right 0) line at high galactic latitudes (16-degrees less-than-or-equal-to b less-than-or-equal-to 44-degrees, 117-degrees less-than-or-equal-to l less-than-or-equal-to 1600). There is CO emission from molecular ''cirrus'' clouds in about 13% of the region surveyed. The CO clouds are grouped together into three major cloud complexes with 29 individual members. All clouds are associated with infrared emission at 100 mum, although there is no one-to-one correlation between the corresponding intensities. CO emission is detected in all bright and dark Lynds' nebulae cataloged in that region; however not all CO clouds are visible on optical photographs as reflection or absorption features. Velocities within v(LSR) less-than-or-equal-to \10 km s-1\ indicate that the clouds are probably local. At an adopted distance of 240 pc cloud sizes range from 0.1 to 30 pc and cloud masses from 1 to 1600M.. The molecular cirrus clouds contribute between 0.4 and 0.8 M. pc-2 to the surface density of molecular gas in the galactic plane. Only 26% of the ''infrared-excess clouds'' in the area surveyed, predicted by Desert et al. to be molecular, actually show CO and about 2/3 of the clouds detected in CO do not show an infrared-excess. On the basis of this result we conclude that the catalog of Desert et al. is a relatively poor guide to most of the molecular material at high latitudes. Also, the assertion by Blitz et al. that a large fraction of these IR-excess clouds represents potential candidates for molecular clouds without detectable CO is not supported by the results of the present survey. C1 CTR ASTROPHYS, CAMBRIDGE, MA 02138 USA. UNIV NEW HAMPSHIRE, INST STUDY EARTH OCEANS & SPACE, DURHAM, NH 03824 USA. NASA, GODDARD SPACE FLIGHT CTR, COMPTON OBSERV SCI SUPPORT CTR, CSC, GREENBELT, MD 20771 USA. UNIV BONN, INST RADIOASTRON, W-5300 BONN 1, GERMANY. RP HEITHAUSEN, A (reprint author), UNIV COLOGNE, INST PHYS 1, ZULPICHER STR 77, W-5000 COLOGNE 41, GERMANY. NR 31 TC 55 Z9 55 U1 0 U2 1 PU EDP SCIENCES S A PI LES ULIS CEDEX A PA 17, AVE DU HOGGAR, PA COURTABOEUF, BP 112, F-91944 LES ULIS CEDEX A, FRANCE SN 0004-6361 J9 ASTRON ASTROPHYS JI Astron. Astrophys. PD FEB PY 1993 VL 268 IS 1 BP 265 EP 275 PG 11 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA KK033 UT WOS:A1993KK03300029 ER PT J AU NEUBAUER, FM MARSCHALL, H POHL, M GLASSMEIER, KH MUSMANN, G MARIANI, F ACUNA, MH BURLAGA, LF NESS, NF WALLIS, MK SCHMIDT, HU UNGSTRUP, E AF NEUBAUER, FM MARSCHALL, H POHL, M GLASSMEIER, KH MUSMANN, G MARIANI, F ACUNA, MH BURLAGA, LF NESS, NF WALLIS, MK SCHMIDT, HU UNGSTRUP, E TI 1ST RESULTS FROM THE GIOTTO MAGNETOMETER EXPERIMENT DURING THE P-GRIGG-SKJELLERUP ENCOUNTER SO ASTRONOMY & ASTROPHYSICS LA English DT Letter DE COMET P-GRIGG-SKJELLERUP; MAGNETIC FIELDS; SOLAR WIND INTERACTION; GIOTTO OBSERVATIONS ID COMET HALLEY; SOLAR-WIND AB The Giotto magnetic field experiment has provided the first magnetic field data on the interaction between the solar wind and a low gas production comet, P/Grigg-Skjellerup. Waves produced by ion pick-up instabilities have been observed throughout the interaction region with particularly simple waveforms at large distances and a rich phenomenology. A bow shock has been observed outbound only, whereas inbound a change in the character of the wave fields occurred without a jump in the magnetic field vector. The inbound and outbound crossings of the bow wave and shock at 19900 km and 25400 km from the nucleus, respectively, imply a neutral gas production rate of (6.7 +/- 1.6) x 10(27) s-1. A magnetic field cavity of the comet was not crossed. The pile-up region of 2500 km width along the trajectory showed a magnetic field peak of 88.7 nT. C1 CIS GMBH, VIERSEN, GERMANY. TECH UNIV BRAUNSCHWEIG, INST GEOPHYS & METEOROL, W-3300 BRAUNSCHWEIG, GERMANY. UNIV ROME, DIPARTIMENTO FIS II, I-00173 ROME, ITALY. NASA, GODDARD SPACE FLIGHT CTR, EXTRATERR PHYS LAB, GREENBELT, MD 20771 USA. BARTOL RES INST, NEWARK, DE 19716 USA. UNIV WALES COLL CARDIFF, CARDIFF CF1 1XL, S GLAM, WALES. MAX PLANCK INST ASTROPHYS, W-8046 GARCHING, GERMANY. UNIV COPENHAGEN, INST GEOPHYS, DK-1168 COPENHAGEN, DENMARK. RP NEUBAUER, FM (reprint author), UNIV COLOGNE, INST GEOPHYS & METEOROL, W-5000 COLOGNE 41, GERMANY. NR 16 TC 60 Z9 60 U1 0 U2 1 PU EDP SCIENCES S A PI LES ULIS CEDEX A PA 17, AVE DU HOGGAR, PA COURTABOEUF, BP 112, F-91944 LES ULIS CEDEX A, FRANCE SN 0004-6361 J9 ASTRON ASTROPHYS JI Astron. Astrophys. PD FEB PY 1993 VL 268 IS 2 BP L5 EP L8 PG 4 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA KM427 UT WOS:A1993KM42700002 ER PT J AU POTGIETER, MS LEROUX, JA BURLAGA, LF MCDONALD, FB AF POTGIETER, MS LEROUX, JA BURLAGA, LF MCDONALD, FB TI THE ROLE OF MERGED INTERACTION REGIONS AND DRIFTS IN THE HELIOSPHERIC MODULATION OF COSMIC-RAYS BEYOND 20-AU - A COMPUTER-SIMULATION SO ASTROPHYSICAL JOURNAL LA English DT Article DE ACCELERATION OF PARTICLES; COSMIC RAYS; INTERPLANETARY MEDIUM; SUN, ACTIVITY ID NEUTRAL SHEET DRIFT; SOLAR MODULATION; OUTER HELIOSPHERE; PARTICLE DRIFT; MAGNETIC-FIELD; DEPENDENT MODULATION; MODEL; TRANSPORT; GRADIENTS; CYCLE AB The time-dependent, axially symmetric transport equation of cosmic rays in the heliosphere was solved numerically using the Voyager 2 magnetic field measurements to simulate merged interaction regions (MIRs) and rarefaction regions (RRs) for the period 1985-1989. Concurrently, the wavy neutral sheet was used as a time-dependent, drift parameter. The two approaches were first modeled separately and then in combination in this exploratory study. The drift approach proved to be the more successful for 1985 to early 1988 because it could reproduce the intensity levels, the factor modulation, and latitudinal gradients for 1 GeV protons at 23 AU without difficulties. The MIR approach used here, on the other hand, could not reproduce, in a straightforward manner, any of these observations unless the assumed modulation boundary was taken at 150-200 AU from the Sun, or when the local interstellar spectrum was made considerably higher than what is presently considered reasonable. With this approach, it was found that the latitudinal span (or, more generally, the spatial extent) of the MIRs became an important modulating parameter in addition to those already well established. Although this very basic approach was less successful for this particular period, it did exhibit important features that the drift approach lacked. Indications were found that it would be more successful for other periods, and that a more advanced approach would do better overall. However, the combination of the two approaches shows exciting prospects in explaining the complete 11 yr and 22 yr modulation cycles. It is concluded that for the period 1985 through 1987 drifts probably were responsible for the ''baseline'' of modulation. MIRs became progressively more important after 1987.6 and may be dominant when solar activity as measured by the ''tilt angle'' of the wavy neutral sheet exceeds moderate levels (35-degrees +/- 5-degrees), as happened before 1985 and after mid-1988. C1 NASA, GODDARD SPACE FLIGHT CTR, GSFC, EXTRATERR PHYS LAB, GREENBELT, MD 20771 USA. UNIV MARYLAND, INST PHYS SCI & TECHNOL, COLL PK, MD 20742 USA. NR 74 TC 45 Z9 45 U1 0 U2 0 PU IOP PUBLISHING LTD PI BRISTOL PA TEMPLE CIRCUS, TEMPLE WAY, BRISTOL BS1 6BE, ENGLAND SN 0004-637X EI 1538-4357 J9 ASTROPHYS J JI Astrophys. J. PD FEB 1 PY 1993 VL 403 IS 2 BP 760 EP 768 DI 10.1086/172247 PN 1 PG 9 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA KJ468 UT WOS:A1993KJ46800033 ER PT J AU KARPEN, JT ANTIOCHOS, SK DAHLBURG, RB SPICER, DS AF KARPEN, JT ANTIOCHOS, SK DAHLBURG, RB SPICER, DS TI THE KELVIN-HELMHOLTZ INSTABILITY IN PHOTOSPHERIC FLOWS - EFFECTS ON CORONAL HEATING AND STRUCTURE SO ASTROPHYSICAL JOURNAL LA English DT Article DE HYDRODYNAMICS; INSTABILITIES; SUN, ATMOSPHERE; SUN, CORONA ID CURRENT-SHEET FORMATION; ELECTRIC-CURRENT SHEETS; TANG VORTEX SYSTEM; SOLAR CORONA; MAGNETIC-FIELDS; COMPRESSIBLE MEDIUM; DISSIPATION; CONVECTION; ENERGY; TURBULENCE AB The continual motion of the photosphere is essential to a wide range of solar phenomena, from the formation of fluxules and the structure of the granulation network to coronal heating. The velocity structure in and around intergranular lanes is unknown at scales below a few hundred kilometers. Both theoretical and observational arguments lead us to believe, however, that a significant sheared component exists in these locations. For example, largely random, strongly sheared flows have been observed down to the smallest resolved scales in Halpha and continuum images. Sheared flows can be susceptible to the Kelvin-Helmholtz instability, which breaks down the laminar velocity patterns into smaller scale components with significant transverse structure. Any morphological alteration in the velocity field will be reflected in the magnetic field, due to the frozen-in condition. Because the footpoints of the coronal magnetic field move with the photospheric flows, the fine structure of the entire solar atmosphere can be affected. We have performed a series of hydrodynamic numerical simulations which investigate the nonlinear evolution of driven, subsonic velocity shears under a range of typical photospheric conditions. Here the hydrodynamic assumption is justified because the magnetic field is primarily perpendicular to the surface of the high-beta photosphere, thus affecting the characteristic time scales but not the qualitative behavior of the instability. Our calculations show that typical photospheric flows are indeed susceptible to the Kelvin-Helmholtz instability, with rapid nonlinear growth times roughly half of a typical granule lifetime. Approximately half of the initial kinetic energy is transferred to smaller spatial scales, the bulk being concentrated at the scale of the persistent Kelvin-Helmholtz vortices (approximately 100 km). Hence the KHI produces vortical structures in intergranule lanes comparable to a typical fluxule radius, which is precisely the right scale for maximum power transfer to the corona. Relevant photospheric observations and implications for wave-resonance heating and coronal structure also are discussed. C1 USN, RES LAB, COMPUTAT PHYS & FLUID DYNAM LAB, WASHINGTON, DC 20375 USA. NASA, GODDARD SPACE FLIGHT CTR, CTR COMPUTAT SCI, GREENBELT, MD 20771 USA. RP USN, RES LAB, EO HULBURT CTR SPACE RES, CODE 7670, WASHINGTON, DC 20375 USA. RI Karpen, Judith/E-1484-2012; Antiochos, Spiro/D-4668-2012 OI Antiochos, Spiro/0000-0003-0176-4312 NR 51 TC 26 Z9 26 U1 0 U2 0 PU IOP PUBLISHING LTD PI BRISTOL PA TEMPLE CIRCUS, TEMPLE WAY, BRISTOL BS1 6BE, ENGLAND SN 0004-637X EI 1538-4357 J9 ASTROPHYS J JI Astrophys. J. PD FEB 1 PY 1993 VL 403 IS 2 BP 769 EP 779 DI 10.1086/172248 PN 1 PG 11 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA KJ468 UT WOS:A1993KJ46800034 ER PT J AU CHEN, W GEHRELS, N CHENG, FH AF CHEN, W GEHRELS, N CHENG, FH TI AN INTERPRETATION OF THE NARROW POSITRON-ANNIHILATION FEATURE FROM X-RAY NOVA MUSCAE-1991 SO ASTROPHYSICAL JOURNAL LA English DT Article DE ACCRETION, ACCRETION DISKS; BINARIES, CLOSE; BLACK HOLE PHYSICS; LINE, FORMATION; GAMMA-RAYS, THEORY ID LINE AB We study the physical mechanisms responsible for producing the narrow, redshifted positron annihilation gamma-ray line from X-ray Nova Muscae 1991 observed by GRANAT/SIGMA. We argue that the line centroid redshift is most probably of gravitational origin, and that the annihilation very likely takes place in the inner region of an accretion disk in the system. The narrow line width can then be naturally explained by a small inclination angle of the accretion disk to our line of sight. The recently measured photometric binary mass function of Remillard, McClintock, & Bailyn (1992) gives the black hole mass for this system as a function of orbital inclination angle which we find it to be 26-degrees +/- 25-degrees. Assuming the accretion disk lies in the orbital plane of the system, the black hole mass is found to have a lower limit of 8 M., although statistics are poor. This is supported by spectral modeling of combined optical/UV/X-ray data and by a new Nova Muscae distance limit we derive of > 3 kpc. The large mass for this black hole and the high binary mass ratio it implies (> 15) raise a serious challenge to theoretical models of the formation and evolution of massive binaries. The gamma-ray line technique introduced here can give tight constraints on orbital parameters when high-sensitivity line measurements are made by such missions as GRO. C1 SPACE TELESCOPE SCI INST,BALTIMORE,MD 21218. UNIV SCI & TECHNOL CHINA,CTR ASTROPHYS,HEFEI,PEOPLES R CHINA. RP CHEN, W (reprint author), NASA,GODDARD SPACE FLIGHT CTR,GREENBELT,MD 20771, USA. RI Gehrels, Neil/D-2971-2012 NR 32 TC 9 Z9 9 U1 0 U2 0 PU UNIV CHICAGO PRESS PI CHICAGO PA 5720 S WOODLAWN AVE, CHICAGO, IL 60637 SN 0004-637X J9 ASTROPHYS J JI Astrophys. J. PD FEB 1 PY 1993 VL 403 IS 2 BP L71 EP L74 DI 10.1086/186724 PN 2 PG 4 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA KJ470 UT WOS:A1993KJ47000006 ER PT J AU ANICICH, VG AF ANICICH, VG TI A SURVEY OF BIMOLECULAR ION-MOLECULE REACTIONS FOR USE IN MODELING THE CHEMISTRY OF PLANETARY-ATMOSPHERES, COMETARY COMAE, AND INTERSTELLAR CLOUD - 1993 SUPPLEMENT SO ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES LA English DT Review DE COMETS, GENERAL; ISM, MOLECULES; MOLECULAR PROCESSES; PLANETS AND SATELLITES, GENERAL ID TRANSLATIONAL ENERGY-DEPENDENCE; GAS-PHASE REACTIONS; STATE-TO-STATE; CHARGE-TRANSFER REACTION; SEQUENTIAL CLUSTERING REACTIONS; TOTAL CROSS-SECTIONS; 30 EV CM; RELEVANT LABORATORY MEASUREMENTS; HYDROGENATED SILICON PARTICLES; COLLISION-INDUCED DISSOCIATION AB This is a supplement to a previous paper (Anicich & Huntress 1986). It is a survey of bimolecular positive ion-molecule reactions with potential importance to the chemistry of planetary atmospheres, cometary comae, and interstellar clouds. This supplement covers the literature from 1986 through 1991, with some additional citations missed in the original survey. Over 200 new citations are included. A table of reactions is listed by reactant ion, and cross-references are provided for both ionic and neutral reactants and also for both ionic and neutral products. RP ANICICH, VG (reprint author), JET PROP LAB,PASADENA,CA 91109, USA. NR 235 TC 88 Z9 90 U1 1 U2 12 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 FEB PY 1993 VL 84 IS 2 BP 215 EP 315 DI 10.1086/191752 PG 101 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA KL381 UT WOS:A1993KL38100004 ER PT J AU SHARMA, AC SRIVASTAVA, KM AF SHARMA, AC SRIVASTAVA, KM TI NONLINEAR ELECTROSTATIC DRIFT KELVIN-HELMHOLTZ INSTABILITY SO ASTROPHYSICS AND SPACE SCIENCE LA English DT Article ID PLASMA AB Nonlinear analysis of electrostatic drift Kelvin-Helmholtz instability is performed. It is shown that the analysis leads to the propagation of the weakly nonlinear dispersive waves and the nonlinear behaviour is governed by the nonlinear Burger's equation. C1 JET PROP LAB,PASADENA,CA 91109. RP SHARMA, AC (reprint author), UNIV ROORKEE,DEPT MATH,ROORKEE 247667,UTTAR PRADESH,INDIA. NR 14 TC 3 Z9 3 U1 0 U2 0 PU KLUWER ACADEMIC PUBL PI DORDRECHT PA SPUIBOULEVARD 50, PO BOX 17, 3300 AA DORDRECHT, NETHERLANDS SN 0004-640X J9 ASTROPHYS SPACE SCI JI Astrophys. Space Sci. PD FEB PY 1993 VL 200 IS 1 BP 107 EP 116 DI 10.1007/BF00658114 PG 10 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA KN373 UT WOS:A1993KN37300010 ER PT J AU MCCORMICK, MP WINKER, DM BROWELL, EV COAKLEY, JA GARDNER, CS HOFF, RM KENT, GS MELFI, SH MENZIES, RT PLATT, CMR RANDALL, DA REAGAN, JA AF MCCORMICK, MP WINKER, DM BROWELL, EV COAKLEY, JA GARDNER, CS HOFF, RM KENT, GS MELFI, SH MENZIES, RT PLATT, CMR RANDALL, DA REAGAN, JA TI SCIENTIFIC INVESTIGATIONS PLANNED FOR THE LIDAR IN-SPACE TECHNOLOGY EXPERIMENT (LITE) SO BULLETIN OF THE AMERICAN METEOROLOGICAL SOCIETY LA English DT Article ID ATMOSPHERIC TRANSPORT; CLOUD MEASUREMENTS; SATELLITE; AEROSOL; TEMPERATURE; SIMULATIONS; CLIMATE; AMERICA; DENSITY; OCEAN AB The Lidar In-Space Technology Experiment (LITE) is being developed by NASA/Langley Research Center for a series of flights on the space shuttle beginning in 1994. Employing a three-wavelength Nd:YAG laser and a 1-m-diameter telescope, the system is a test-bed for the development of technology required for future operational spaceborne lidars. The system has been designed to observe clouds, tropospheric and stratospheric aerosols, characteristics of the planetary boundary layer, and stratospheric density and temperature perturbations with much greater resolution than is available from current orbiting sensors. In addition to providing unique datasets on these phenomena, the data obtained will be useful in improving retrieval algorithms currently in use. Observations of clouds and the planetary boundary layer will aid in the development of global climate model (GCM) parameterizations. This article briefly describes the LITE program and discusses the types of scientific investigations planned for the first flight. C1 OREGON STATE UNIV,DEPT ATMOSPHER SCI,CORVALLIS,OR 97331. CTR ATMOSPHER RES EXPERIMENTS,ATMOSPHER ENVIRONM SERV,EGBERT,ON,CANADA. CSIRO,DIV ATMOSPHER PHYS,ASPENDALE,VIC,AUSTRALIA. UNIV ILLINOIS,DEPT ELECT ENGN,URBANA,IL 61801. JET PROP LAB,PASADENA,CA 91109. SCI & TECHNOL CORP,HAMPTON,VA. NASA,GODDARD SPACE FLIGHT CTR,GREENBELT,MD 20771. COLORADO STATE UNIV,DEPT ATMOSPHER SCI,FT COLLINS,CO 80523. UNIV ARIZONA,DEPT ELECT ENGN,TUCSON,AZ 85721. RP MCCORMICK, MP (reprint author), NASA,LANGLEY RES CTR,DIV ATMOSPHER SCI,HAMPTON,VA 23665, USA. RI Hoff, Raymond/C-6747-2012; Randall, David/E-6113-2011 OI Randall, David/0000-0001-6935-4112 NR 27 TC 67 Z9 69 U1 1 U2 5 PU AMER METEOROLOGICAL SOC PI BOSTON PA 45 BEACON ST, BOSTON, MA 02108-3693 SN 0003-0007 J9 B AM METEOROL SOC JI Bull. Amer. Meteorol. Soc. PD FEB PY 1993 VL 74 IS 2 BP 205 EP 214 DI 10.1175/1520-0477(1993)074<0205:SIPFTL>2.0.CO;2 PG 10 WC Meteorology & Atmospheric Sciences SC Meteorology & Atmospheric Sciences GA KN456 UT WOS:A1993KN45600003 ER PT J AU SMITH, EA CHOUDHURY, BJ AF SMITH, EA CHOUDHURY, BJ TI THE RELATIONSHIP BETWEEN ANOMALIES OF INTERANNUAL NET-RADIATION AND 37 GHZ POLARIZATION DIFFERENCE OVER NORTH-AFRICA SO CLIMATIC CHANGE LA English DT Article ID SEMI-ARID REGIONS; SURFACE ALBEDO; SAHEL; DROUGHT AB We show evidence that interannual variations in the net radiation balance at the top-of-atmosphere over North Africa may be linked to variations at the land surface within the Sahelian zone. By utilizing concurrent monthly time series of earth radiation budget and passive microwave measurements obtained from the Nimbus 7 satellite over a five year period from 1979 to 1983, we have examined the spatial distribution of the amplitude of interannual variability of the net radiation at the top of the atmosphere. A strong association is found between the radiation budget anomalies derived from ERB-WFOV measurements and the anomalies of 37 GHz polarized brightness temperature difference derived from SMMR measurements. Previous research has shown that the interannual anomalies in the top-of-atmosphere net radiation balance in the Sahelian zone mostly arise from changes taking place at the surface, not from variations in cloudiness which brings variable rainfall throughout the African Sahel. Since microwave polarization difference is related in part to vegetation cover, we suggest that the main control of the modulation of North Africa's radiation balance may be year to year fluctuations of vegetation cover within the Sahelian zone, likely stemming from fluctuations in the rainfall. This relationship is relevant to the problem of radiation control and feedback on global climate through processes taking place within the biosphere of a semi-arid zone. C1 FLORIDA STATE UNIV,SUPERCOMP COMPUTAT RES INST,TALLAHASSEE,FL 32306. NASA,GODDARD SPACE FLIGHT CTR,HYDROL SCI BRANCH,GREENBELT,MD 20771. RP SMITH, EA (reprint author), FLORIDA STATE UNIV,DEPT METEOROL,TALLAHASSEE,FL 32306, USA. NR 20 TC 0 Z9 0 U1 0 U2 3 PU KLUWER ACADEMIC PUBL PI DORDRECHT PA SPUIBOULEVARD 50, PO BOX 17, 3300 AA DORDRECHT, NETHERLANDS SN 0165-0009 J9 CLIMATIC CHANGE JI Clim. Change PD FEB PY 1993 VL 23 IS 2 BP 141 EP 154 DI 10.1007/BF01097334 PG 14 WC Environmental Sciences; Meteorology & Atmospheric Sciences SC Environmental Sciences & Ecology; Meteorology & Atmospheric Sciences GA KM411 UT WOS:A1993KM41100004 ER PT J AU PEDOWITZ, RA GERSHUNI, DH BOTTE, MJ KUIPER, S RYDEVIK, BL HARGENS, AR AF PEDOWITZ, RA GERSHUNI, DH BOTTE, MJ KUIPER, S RYDEVIK, BL HARGENS, AR TI THE USE OF LOWER TOURNIQUET INFLATION PRESSURES IN EXTREMITY SURGERY FACILITATED BY CURVED AND WIDE TOURNIQUETS AND AN INTEGRATED CUFF INFLATION SYSTEM SO CLINICAL ORTHOPAEDICS AND RELATED RESEARCH LA English DT Article ID PNEUMATIC TOURNIQUET; LOWER-LIMB; COMPRESSION; BENEATH AB Use of the lowest possible cuff inflation pressure should minimize the pathogenic effects of compression beneath the pneumatic tourniquet. Curved tourniquets (designed to fit conically shaped limbs) and wider tourniquets were associated with significantly lower arterial occlusion pressure (AOP) than standard, straight tourniquets on the arms and legs of 26 normal volunteers. These tourniquets were used with an integrated tourniquet inflation system in 29 upper-extremity and 31 lower-extremity surgeries. Mean tourniquet inflation pressures of 183.7 mm Hg and 208 mm Hg were used during various surgical procedures of the arm and leg, respectively. Incomplete hemostasis was associated with elevated systolic blood pressure in several cases, but acceptable surgical hemostasis was achieved by incremental increase of the cuff inflation pressure. Curved cuffs, wide cuffs, and an integrated cuff inflation system should facilitate the use of lower tourniquet inflation pressures in extremity surgery. C1 VET ADM MED CTR,SAN DIEGO,CA 92161. GOTHENBURG UNIV,DEPT ORTHOPAED,S-41124 GOTHENBURG,SWEDEN. NASA,AMES RES FACIL,MOFFETT FIELD,CA 94035. RP PEDOWITZ, RA (reprint author), UNIV CALIF SAN DIEGO,MED CTR,DEPT ORTHOPAED,225 DICKINSON ST H-894,SAN DIEGO,CA 92103, USA. FU NIADDK NIH HHS [AM-25501] NR 30 TC 27 Z9 29 U1 1 U2 6 PU LIPPINCOTT-RAVEN PUBL PI PHILADELPHIA PA 227 EAST WASHINGTON SQ, PHILADELPHIA, PA 19106 SN 0009-921X J9 CLIN ORTHOP RELAT R JI Clin. Orthop. Rel. Res. PD FEB PY 1993 IS 287 BP 237 EP 244 PG 8 WC Orthopedics; Surgery SC Orthopedics; Surgery GA KR844 UT WOS:A1993KR84400038 PM 8448950 ER PT J AU YODER, JA VERITY, PG BISHOP, SS HOGE, FE AF YODER, JA VERITY, PG BISHOP, SS HOGE, FE TI PHYTOPLANKTON CHL-A, PRIMARY PRODUCTION AND NUTRIENT DISTRIBUTIONS ACROSS A COASTAL FRONTAL ZONE OFF GEORGIA, USA SO CONTINENTAL SHELF RESEARCH LA English DT Article ID SOUTHEASTERN UNITED-STATES; CONTINENTAL-SHELF; WATERS AB Using results obtained by ship and aircraft surveys of near-shore waters off Georgia, U.S.A. we describe the gradients in major plant nutrients, near-surface cholorphyll (Chl a) and near-surface primary production in relation to near-surface density gradients of a coastal frontal zone. The results show that a relatively narrow band (approximately 10 km wide) of high phytoplankton biomass (Chl a) is a ubiquitous feature of the shoreward side of the coastal frontal zone. Chl a decreases across the frontal zone as salinity increases and near surface Chl a concentrations are approximately 10-fold greater in the high Chl a band than on the seaward side of the frontal zone. Near-surface phosphate and silicate concentrations are distributed similarly to Chl a. In contrast to silicate and phosphate, we did not detect significant cross-shelf gradients of inorganic nitrogen (N) concentrations. The distributions imply high rates of primary production in the coastal band throughout the year, total consumption of available inorganic N brought in by rivers or other sources and high rates of N recycling. C1 SKIDAWAY INST OCEANOG,SAVANNAH,GA 31416. NASA,GODDARD SPACE FLIGHT CTR,WALLOPS FLIGHT FACIL,WALLOPS ISL,VA 23337. RP YODER, JA (reprint author), UNIV RHODE ISL,GRAD SCH OCEANOG,NARRAGANSETT,RI 02882, USA. OI yoder, james/0000-0002-2700-8681 NR 29 TC 15 Z9 15 U1 1 U2 5 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0278-4343 J9 CONT SHELF RES JI Cont. Shelf Res. PD FEB-MAR PY 1993 VL 13 IS 2-3 BP 131 EP 141 DI 10.1016/0278-4343(93)90102-4 PG 11 WC Oceanography SC Oceanography GA KH766 UT WOS:A1993KH76600001 ER PT J AU LEVINE, ER RANSON, KJ SMITH, JA WILLIAMS, DL KNOX, RG SHUGART, HH URBAN, DL LAWRENCE, WT AF LEVINE, ER RANSON, KJ SMITH, JA WILLIAMS, DL KNOX, RG SHUGART, HH URBAN, DL LAWRENCE, WT TI FOREST ECOSYSTEM DYNAMICS - LINKING FOREST SUCCESSION, SOIL PROCESS AND RADIATION MODELS SO ECOLOGICAL MODELLING LA English DT Article ID COMPUTER-SIMULATION; REFLECTANCE; CANOPY; DECLINE; GROWTH AB The Forest Ecosystem Dynamics (FED) project involves the development of an integrated mathematical model which links individual submodels of soil processes, forest growth and succession, and radiative transfer. The model will accommodate spatial scales from local to regional, and temporal scales from physiological to long term ecological processes. In its integrated form, the model is designed to simulate a forest ecosystem operating in a ''process-response'' manner whereby natural or anthropogenically induced changes in the environment will elicit responses within the soil, vegetation, and radiation regime of a forest that will impact and modify each other. In order to insure maximum flexibility for both the modeler and the user, an ''object-oriented'' structure will be implemented. In this way, the model will provide a tool with which patterns and processes within northern forests resulting from global change can be predicted. C1 NASA,GODDARD SPACE FLIGHT CTR,UNIV SPACE RES ASSOC,BIOSPHER SCI BRANCH,GREENBELT,MD 20771. UNIV VIRGINIA,DEPT ENVIRONM SCI,CHARLOTTESVILLE,VA 22903. NASA,GODDARD SPACE FLIGHT CTR,NATL RES COUNCIL,BIOSPHER SCI BRANCH,GREENBELT,MD 20771. RP LEVINE, ER (reprint author), NASA,GODDARD SPACE FLIGHT CTR,TERR PHYS LAB,GREENBELT,MD 20771, USA. RI Knox, Robert/E-9657-2011; Ranson, Kenneth/G-2446-2012; Shugart, Herman/C-5156-2009 OI Ranson, Kenneth/0000-0003-3806-7270; NR 39 TC 42 Z9 44 U1 0 U2 3 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0304-3800 J9 ECOL MODEL JI Ecol. Model. PD FEB PY 1993 VL 65 IS 3-4 BP 199 EP 219 DI 10.1016/0304-3800(93)90080-C PG 21 WC Ecology SC Environmental Sciences & Ecology GA KM792 UT WOS:A1993KM79200003 ER PT J AU PLESNIAK, MW BELL, JH MEHTA, RD AF PLESNIAK, MW BELL, JH MEHTA, RD TI EFFECTS OF SMALL CHANGES IN INITIAL CONDITIONS ON MIXING LAYER 3-DIMENSIONALITY SO EXPERIMENTS IN FLUIDS LA English DT Note C1 NASA,AMES RES CTR,FLUID MECH LAB,MOFFETT FIELD,CA 94035. STANFORD UNIV,JIAA,DEPT AERONAUT & ASTRONAUT,STANFORD,CA 94305. RP PLESNIAK, MW (reprint author), STANFORD UNIV,DEPT MECH ENGN,DIV THERMOSCI,STANFORD,CA 94305, USA. OI Plesniak, Michael/0000-0001-6575-5074 NR 5 TC 6 Z9 6 U1 0 U2 2 PU SPRINGER VERLAG PI NEW YORK PA 175 FIFTH AVE, NEW YORK, NY 10010 SN 0723-4864 J9 EXP FLUIDS JI Exp. Fluids PD FEB PY 1993 VL 14 IS 4 BP 286 EP 288 PG 3 WC Engineering, Mechanical; Mechanics SC Engineering; Mechanics GA KP774 UT WOS:A1993KP77400012 ER PT J AU LAM, CW WEIR, FW WILLIAMSCAVENDER, K TAN, MN GALEN, TJ PIERSON, DL AF LAM, CW WEIR, FW WILLIAMSCAVENDER, K TAN, MN GALEN, TJ PIERSON, DL TI TOXICOKINETICS OF INHALED BROMOTRIFLUOROMETHANE (HALON-1301) IN HUMAN-SUBJECTS SO FUNDAMENTAL AND APPLIED TOXICOLOGY LA English DT Article C1 UNIV TEXAS,HLTH SCI CTR,HOUSTON,TX 77225. NASA,LYNDON B JOHNSON SPACE CTR,KRUG LIFE SCI,HOUSTON,TX 77058. UNIV TEXAS,SCH PUBL HLTH,HOUSTON,TX 77225. RP LAM, CW (reprint author), NASA,LYNDON B JOHNSON SPACE CTR,BIOMED OPERAT & RES BRANCH,SD4,HOUSTON,TX 77058, USA. NR 22 TC 5 Z9 5 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 0272-0590 J9 FUND APPL TOXICOL JI Fundam. Appl. Toxicol. PD FEB PY 1993 VL 20 IS 2 BP 231 EP 239 DI 10.1006/faat.1993.1031 PG 9 WC Toxicology SC Toxicology GA KM857 UT WOS:A1993KM85700014 PM 8449395 ER PT J AU CALKINS, DS DEGIOANNI, JJ TAN, MN DAVIS, JR PIERSON, DL AF CALKINS, DS DEGIOANNI, JJ TAN, MN DAVIS, JR PIERSON, DL TI HUMAN-PERFORMANCE AND PHYSIOLOGICAL-FUNCTION DURING A 24-HR EXPOSURE TO 1-PERCENT BROMOTRIFLUOROMETHANE (HALON-1301) SO FUNDAMENTAL AND APPLIED TOXICOLOGY LA English DT Article C1 NASA,LYNDON B JOHNSON SPACE CTR,SPACE BIOMED RES INST,HOUSTON,TX 77058. NASA,LYNDON B JOHNSON SPACE CTR,MED OPERAT BRANCH,HOUSTON,TX 77058. NASA,LYNDON B JOHNSON SPACE CTR,BIOMED OPERAT & RES BRANCH,HOUSTON,TX 77058. UNIV TEXAS,SCH PUBL HLTH,HOUSTON,TX 77030. RP CALKINS, DS (reprint author), NASA,LYNDON B JOHNSON SPACE CTR,KRUG LIFE SCI,HOUSTON,TX 77058, USA. NR 17 TC 5 Z9 5 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 0272-0590 J9 FUND APPL TOXICOL JI Fundam. Appl. Toxicol. PD FEB PY 1993 VL 20 IS 2 BP 240 EP 247 DI 10.1006/faat.1993.1032 PG 8 WC Toxicology SC Toxicology GA KM857 UT WOS:A1993KM85700015 PM 8449396 ER PT J AU CASANOVA, I KEIL, K NEWSOM, HE AF CASANOVA, I KEIL, K NEWSOM, HE TI COMPOSITION OF METAL IN AUBRITES - CONSTRAINTS ON CORE FORMATION SO GEOCHIMICA ET COSMOCHIMICA ACTA LA English DT Article ID IRON-METEORITES; ORIGIN; HISTORY AB Aubrites are differentiated stone meteorites with small amounts of metal. Study of eight aubrites reveals that Fe,Ni grains occur in a variety of textures, from irregular mum-sized particles to rounded nodules of up to 1.5 cm in diameter. The pattern of siderophile element abundances in the silicates is characteristic of igneous metal segregation (the more siderophilic elements are more depleted). Despite large uncertainties in metal/silicate distribution coefficients, the calculated minimum metal content of the aubrite precursor is not unlike that of enstatite chondrites and suggests that metal segregation was an extensive process in the early magmatic evolution of the aubrite parent body. However, the lack of appreciable fractionation in the trace element signature of the metal suggests that the metal now observed in aubrites did not undergo fractional crystallization in a core. We argue instead that the analyzed metal nodules represent a fraction of the iron-nickel that, during partial melting, was not completely segregated from the silicates. C1 UNIV CHICAGO,DEPT GEOPHYS SCI,CHICAGO,IL 60637. NASA,LYNDON B JOHNSON SPACE CTR,HOUSTON,TX 77058. UNIV HAWAII,SCH OCEAN & EARTH SCI & TECHNOL,DEPT GEOL & GEOPHYS,HONOLULU,HI 96822. UNIV NEW MEXICO,INST METEORIT,DEPT GEOL,ALBUQUERQUE,NM 87131. NR 33 TC 29 Z9 29 U1 0 U2 0 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0016-7037 J9 GEOCHIM COSMOCHIM AC JI Geochim. Cosmochim. Acta PD FEB PY 1993 VL 57 IS 3 BP 675 EP 682 DI 10.1016/0016-7037(93)90377-9 PG 8 WC Geochemistry & Geophysics SC Geochemistry & Geophysics GA KM508 UT WOS:A1993KM50800015 ER PT J AU BLANK, JG DELANEY, JR DESMARAIS, DJ AF BLANK, JG DELANEY, JR DESMARAIS, DJ TI THE CONCENTRATION AND ISOTOPIC COMPOSITION OF CARBON IN BASALTIC GLASSES FROM THE JUAN-DE-FUCA RIDGE, PACIFIC-OCEAN SO GEOCHIMICA ET COSMOCHIMICA ACTA LA English DT Article ID SUBMARINE BASALTS; POPPING ROCKS; CO2; DIOXIDE; MORB; FRACTIONATION; EVOLUTION; VOLATILES; SULFUR; CRESTS AB The abundance and C-13/C-12 ratios of carbon were analyzed in basaltic glass from twenty locations along the Juan de Fuca Ridge using a 3-step combustion /extraction technique. Carbon released during the first two combustion steps at 400-500-degrees-C and 600-650-degrees-C is interpreted to be secondary, and only the carbon recovered during a final combustion step at almost-equal-to 1200-degrees-C is thought to be indigenous to the samples. For carbon released at almost-equal-to 1200-degrees-C, glasses analyzed as 1-2 mm chips contained 23-146 ppm C with deltaC-13 values of -4.8 to -9.3 parts per thousand, whereas samples crushed to 38-63 mum or 63-90 mum yielded 56-103 ppm C with deltaC-13 values of -6.1 to -9.2 parts per thousand. The concentrations and isotopic compositions of the primary carbon dissolved in the glasses and present in the vesicles are similar to those previously reported for other ocean-ridge basalts. The Juan de Fuca basaltic magmas were not in equilibrium with respect to carbon when they erupted and quenched on the sea floor. Evidence of disequilibrium includes (1) a large range of carbon contents among glasses collected at similar depths, (2) a highly variable calculated carbon isotopic fractionation between melt and vapor determined by comparing crushed and uncrushed splits of the same sample, and (3) a lack of correlation between vesicle abundance, carbon concentration, and depth of eruption. Variations in carbon concentration and deltaC-13 ratios along the ridge do not correlate with major element chemistry. The observed relationship between carbon concentrations and deltaC-13 values may be explained by late-stage, variable degrees of open-system (Rayleigh-like) degassing. C1 UNIV WASHINGTON, SCH OCEANOG, SEATTLE, WA 98195 USA. NASA, AMES RES CTR, MOFFETT FIELD, CA 94035 USA. RP BLANK, JG (reprint author), CALTECH, DIV GEOL & PLANETARY SCI, 170-25, PASADENA, CA 91125 USA. FU NCIPC CDC HHS [OCE83-09812, OCE79-25041, OCE81-11413] NR 76 TC 29 Z9 30 U1 0 U2 3 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLAND SN 0016-7037 EI 1872-9533 J9 GEOCHIM COSMOCHIM AC JI Geochim. Cosmochim. Acta PD FEB PY 1993 VL 57 IS 4 BP 875 EP 887 DI 10.1016/0016-7037(93)90175-V PG 13 WC Geochemistry & Geophysics SC Geochemistry & Geophysics GA KN412 UT WOS:A1993KN41200012 PM 11537736 ER PT J AU SHIH, CY NYQUIST, LE DASCH, EJ BOGARD, DD BANSAL, BM WIESMANN, H AF SHIH, CY NYQUIST, LE DASCH, EJ BOGARD, DD BANSAL, BM WIESMANN, H TI AGES OF PRISTINE NORITIC CLASTS FROM LUNAR BRECCIA-15445 AND BRECCIA-15455 SO GEOCHIMICA ET COSMOCHIMICA ACTA LA English DT Article ID ND ISOTOPIC EVOLUTION; PRECISE DETERMINATION; SM; CHONDRITES; CRUST; MOON; GEOCHRONOLOGY; PETROGENESIS; CHRONOLOGY; EUCRITE AB Rb-Sr and Sm-Nd isotopic studies were undertaken of two Apollo 15 breccias, 15445 and 15455, collected near Spur Crater on the Apennine Front. Seven pristine lithic clasts including four norites, one anorthositic norite, one troctolitic anorthosite and one spinel troctolite, as well as a matrix sample of 15445, were analysed. In addition, a K-Ar age determination was also made for a plagioclase separate from a different anorthositic norite clast. Sm-Nd isotopic data of a pristine Mg-norite sample, 15445,17, from the large white Clast B of breccia 15445 yielded a precise internal isochron age of 4.46 +/- 0.07 Ga for lambda(Sm-147) = 0.00654 Ga-1 and an initial Nd-143/Nd-144 of 0.506058 -/+ 0.000078 (normalized to Nd-148/Nd-144 = 0.24308) corresponding to an initial epsilon(Nd) of +0.71. However, Sm-Nd isotopic results of another Mg-norite sample, 15445,247, chipped from the same Clast B, about 1 cm away from 15445,17, yielded a significantly younger isochron age of 4.28 +/- 0.03 Ga and a higher initial Nd-143/Nd-144 of 0.506246 -/+ 0.000037 corresponding to an initial epsilon(Nd) of -0.35. The Sm-Nd data indicate that Clast B is heterogeneous and contains at least two similar lithologies. The Rb-Sr isotopic systems were severely disturbed for both norites. No useful isochron ages were observed. The Sm-Nd age and epsilon(Nd) data for A-15 Mg-norites 15445,17 and 15445,247, A-17 Mg-norite 78236, and two Mg-gabbronorites 73255,27,45 and 67667 are clearly resolved from each other. Four distinct parental magmas are required for derivation of these two major groups of Mg-suite noritic rocks. The Rb-Sr isotopic system of an anorthositic norite clast, 15455,228, was slightly disturbed; and isotopic data defined an isochron age of 4.59 +/- 0.13 Ga for lambda(Rb-87) = 0.01 39 Ga-1 or 4.55 +/- 0.13 Ga for lambda (Rb-87) = 0.01402 Ga-1. The corresponding initial Sr-87/Sr-86 for the rock is 0.69899 -/+ 0.00006 and is in satisfactory agreement with the LUNI value of NYQUIST et al. ( 1974). The Sm-Nd system is more disturbed than the Rb-Sr system for this rock. A tie-line between whole-rock samples and a pyroxene separate gives a Sm-Nd age of 4.53 +/- 0.29 Ga, which is in nominal agreement with the Rb-Sr isochron age. The Ar-39-Ar-40 age of a plagioclase separate of the rock has a weighted average value of approximately 3.83 Ga, suggesting that the age was reset by the Imbrium impact event. Probably, the Sm-Nd and Rb-Sr systems of the clast were also partly reset by this event. Our age results indicate that some Mg-suite rocks are as old as ferroan-anorthosite-suite rocks. Furthermore, age data of three major crustal rocks (a Mg suite, a ferroan-anorthosite suite, and an evolved suite) show that they all have variable ages. These observations are difficult to explain by the ''magma ocean'' hypothesis alone. Petrogenetic processes such as production of Mg-suite rocks by ''serial magmatism'' (WALKER, 1983), of ferroan-anorthosite-suite rocks by ''multiple diapiric intrusions'' (LONGHI and ASHWAL, 1985), and evolved-suite rocks by ''continuous magmatism'' (MEYER et al., 1988, 1989) probably all played a role. These processes seem to be able to accommodate the wide ranges of ages and different origins observed for lunar crustal rocks. C1 NASA HEADQUARTERS, WASHINGTON, DC 20546 USA. NASA, LYNDON B JOHNSON SPACE CTR, SN2 PLANETARY SCI BRANCH, HOUSTON, TX 77058 USA. RP LOCKHEED ENGN & SCI CO, 2400 NASA RD 1, HOUSTON, TX 77258 USA. NR 83 TC 45 Z9 46 U1 0 U2 7 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLAND SN 0016-7037 EI 1872-9533 J9 GEOCHIM COSMOCHIM AC JI Geochim. Cosmochim. Acta PD FEB PY 1993 VL 57 IS 4 BP 915 EP 931 DI 10.1016/0016-7037(93)90178-Y PG 17 WC Geochemistry & Geophysics SC Geochemistry & Geophysics GA KN412 UT WOS:A1993KN41200015 ER PT J AU DEVRIES, MS REIHS, K WENDT, HR GOLDEN, WG HUNZIKER, HE FLEMING, R PETERSON, E CHANG, S AF DEVRIES, MS REIHS, K WENDT, HR GOLDEN, WG HUNZIKER, HE FLEMING, R PETERSON, E CHANG, S TI A SEARCH FOR C60 IN CARBONACEOUS CHONDRITES SO GEOCHIMICA ET COSMOCHIMICA ACTA LA English DT Letter ID POLYCYCLIC AROMATIC-HYDROCARBONS; MURCHISON METEORITE; MASS-SPECTROMETRY; ORGANIC-MATTER; ISOTOPIC COMPOSITION; C-60; MOLECULES; DUST; ION; BUCKMINSTERFULLERENE AB Analysis of interior samples of the Murchison meteorite by two routes yielded an upper limit of 2 ppb for its C60 content, as compared to parts per million levels for individual polycyclic aromatic hydrocarbons (PAHs). Provided the samples contain an interstellar component, which is probable since Murchison hydrocarbons contain excess deuterium, this result argues against the ubiquitous presence of C60 in the interstellar medium. A possible explanation for the absence of C60 was found in experiments showing how PAHs replace fullerenes as stable end products when hydrogen is present during carbon condensation. As a secondary result we found high molecular weight PAHs in the Murchison and Allende meteorites. Coronene and its methyl derivatives are especially interesting since features in the coronene spectrum have been shown to match some of the unidentified interstellar infrared emission bands. C1 CHARLES EVANS & ASSOCIATES,REDWOOD CITY,CA 94063. NASA,AMES RES CTR,PLANETARY BIOL BRANCH,MOFFETT FIELD,CA 94035. RP DEVRIES, MS (reprint author), IBM CORP,DIV RES,ALMADEN RES CTR,650 HARRY RD,SAN JOSE,CA 95120, USA. NR 36 TC 74 Z9 74 U1 0 U2 2 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0016-7037 J9 GEOCHIM COSMOCHIM AC JI Geochim. Cosmochim. Acta PD FEB PY 1993 VL 57 IS 4 BP 933 EP 938 DI 10.1016/0016-7037(93)90179-Z PG 6 WC Geochemistry & Geophysics SC Geochemistry & Geophysics GA KN412 UT WOS:A1993KN41200016 PM 11539455 ER PT J AU ARVIDSON, RE SHEPARD, MK GUINNESS, EA PETROY, SB PLAUT, JJ EVANS, DL FARR, TG GREELEY, R LANCASTER, N GADDIS, LR AF ARVIDSON, RE SHEPARD, MK GUINNESS, EA PETROY, SB PLAUT, JJ EVANS, DL FARR, TG GREELEY, R LANCASTER, N GADDIS, LR TI CHARACTERIZATION OF LAVA-FLOW DEGRADATION IN THE PISGAH AND CIMA VOLCANIC FIELDS, CALIFORNIA, USING LANDSAT THEMATIC MAPPER AND AIRSAR DATA SO GEOLOGICAL SOCIETY OF AMERICA BULLETIN LA English DT Article ID BIDIRECTIONAL REFLECTANCE SPECTROSCOPY; LANDSCAPE EVOLUTION; INITIAL ANALYSIS; MOJAVE-DESERT; RADAR; CALIBRATION; SIGNATURES; MAGELLAN; MINERALS; NEVADA AB Digital Landsat Thematic Mapper (TM) observations, multi-frequency polarimetric AIRSAR radar data, microtopographic profiles derived from helicopter-borne photography, and field measurements were analyzed over the Pisgah and Cima volcanic fields, and Lavic Lake playa, Mojave Desert, California. Surface radiance factors were extracted from TM data using radiative transfer procedures to model the atmosphere and surface simultaneously. AIRSAR data were calibrated to backscatter specific cross sections using corner reflectors deployed at a number of locations. Analyses focused on the use of key field sites to understand compositional and textural controls on TM band-5 (1.55 to 1.75 mum) radiance factors and C- (5.6 cm), L- (24 cm), and P- (68 cm) band specific cross sections. For the Pisgah and Lavic Lake sites, the TM data are explained using a linear mixing model of basalt and fine-grained sediment (clay to sand-sized grains of clay minerals, quartz, feldspar, carbonate, and lithic fragments) radiance factors, with the addition of shadows for the rough a'a flow. On the other hand, AIRSAR data are shown to be primarily controlled by surface roughness, as there is a strong correlation between specific cross section and surface height standard deviation. For the elongate flows at the Cima volcanic field, which exhibit a mix of pahoehoe and a'a properties, we find a positive linear relationship between TM band-5 radiance factors and flow ages for the 3 m.y. age range represented. Specific cross sections remain constant until about 0.14 Ma and then decrease with age up to about 0.56 Ma. On the other hand, data for the two older flows (0.70 and 0.85 Ma) show increasing specific cross sections with increasing age. We interpret the increase in TM band-5 radiance factors (from 0.05 to 0.25) with increasing flow age and the decrease in specific cross sections (8 dB change at 35-degrees incidence angle for L band) for flows up to 0.56 Ma in age as due to smoothing by mass wasting and infill by fine-grained aeolian deposits. The increased specific cross sections for older flows are interpreted to be a consequence of surface roughness generated by fluvial dissection. C1 JET PROP LAB,PASADENA,CA 91109. ARIZONA STATE UNIV,DEPT GEOL,TEMPE,AZ 85287. RP ARVIDSON, RE (reprint author), WASHINGTON UNIV,MCDONNELL CTR SPACE SCI,DEPT EARTH & PLANETARY SCI,ST LOUIS,MO 63130, USA. NR 54 TC 19 Z9 19 U1 0 U2 5 PU GEOLOGICAL SOC AMERICA PI BOULDER PA PO BOX 9140 3300 PENROSE PLACE, BOULDER, CO 80301 SN 0016-7606 J9 GEOL SOC AM BULL JI Geol. Soc. Am. Bull. PD FEB PY 1993 VL 105 IS 2 BP 175 EP 188 DI 10.1130/0016-7606(1993)105<0175:COLFDI>2.3.CO;2 PG 14 WC Geosciences, Multidisciplinary SC Geology GA KL334 UT WOS:A1993KL33400004 ER PT J AU GOODING, JL AF GOODING, JL TI METEORITICS SO GEOTIMES LA English DT Article RP GOODING, JL (reprint author), NASA,LYNDON B JOHNSON SPACE CTR,OFF CURATOR,SN2,HOUSTON,TX 77058, USA. NR 0 TC 0 Z9 0 U1 0 U2 1 PU AMER GEOLOGICAL INST PI ALEXANDRIA PA 4220 KING ST, ALEXANDRIA, VA 22302-1507 SN 0016-8556 J9 GEOTIMES JI Geotimes PD FEB PY 1993 VL 38 IS 2 BP 23 EP 24 PG 2 WC Geosciences, Multidisciplinary SC Geology GA KL388 UT WOS:A1993KL38800023 ER PT J AU WISNIEWSKI, WZ BARUCCI, MA FULCHIGNONI, M DESANCTIS, C DOTTO, E ROTUNDI, A BINZEL, RP MADRAS, CD GREEN, SF KELLY, ML NEWMAN, PJ HARRIS, AW YOUNG, JW BLANCO, C DIMARTINO, M FERRERI, W GONANOBEURER, M MOTTOLA, S THOLEN, DJ GOLDADER, JD CORADINI, M MAGNUSSON, P AF WISNIEWSKI, WZ BARUCCI, MA FULCHIGNONI, M DESANCTIS, C DOTTO, E ROTUNDI, A BINZEL, RP MADRAS, CD GREEN, SF KELLY, ML NEWMAN, PJ HARRIS, AW YOUNG, JW BLANCO, C DIMARTINO, M FERRERI, W GONANOBEURER, M MOTTOLA, S THOLEN, DJ GOLDADER, JD CORADINI, M MAGNUSSON, P TI GROUND-BASED PHOTOMETRY OF ASTEROID-951 GASPRA SO ICARUS LA English DT Article C1 OBSERV PARIS,DAEC,F-92195 MEUDON,FRANCE. UNIV ROMA LA SAPIENZA,IST ASTRON,I-00161 ROME,ITALY. MIT,CAMBRIDGE,MA 02139. UNIV KENT,PHYS LAB,CANTERBURY CT2 7NR,KENT,ENGLAND. JET PROP LAB,PASADENA,CA 91109. UNIV CATANIA,IST ASTRON,I-95125 CATANIA,ITALY. OSSERV ASTRON TORINO,I-10025 PINO TORINESE,ITALY. DLR,GERMAN AEROSP RES ESTAB,W-8031 OBERPFAFFENHOFEN,GERMANY. INST ASTRON,HONOLULU,HI 96822. EUROPEAN SPACE AGCY,F-75738 PARIS 15,FRANCE. QUEEN MARY & WESTFIELD COLL,SCH MATH SCI,LONDON E1 4NS,ENGLAND. RP WISNIEWSKI, WZ (reprint author), UNIV ARIZONA,LUNAR & PLANETARY LAB,SPACE SCI BLDG,TUCSON,AZ 85721, USA. RI Green, Simon/C-7408-2009; OI De Sanctis, Maria Cristina/0000-0002-3463-4437; Dotto, Elisabetta/0000-0002-9335-1656; Rotundi, Alessandra/0000-0001-5467-157X NR 13 TC 13 Z9 13 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 0019-1035 J9 ICARUS JI Icarus PD FEB PY 1993 VL 101 IS 2 BP 213 EP 222 DI 10.1006/icar.1993.1019 PG 10 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA KR334 UT WOS:A1993KR33400004 ER PT J AU NELSON, RM LANE, AL MORRILL, ME WALLIS, BD GIBSON, J SMYTHE, WD HORN, LJ BURATTI, BJ AF NELSON, RM LANE, AL MORRILL, ME WALLIS, BD GIBSON, J SMYTHE, WD HORN, LJ BURATTI, BJ TI THE BRIGHTNESS OF JUPITER SATELLITE IO FOLLOWING EMERGENCE FROM ECLIPSE - SELECTED OBSERVATIONS, 1981-1989 SO ICARUS LA English DT Article ID 0.65-2.5 MU-M; GALILEAN SATELLITES; WATER FROST; SURFACE; ICE; SO2 RP NELSON, RM (reprint author), JET PROP LAB,4800 OAK GROVE DR,PASADENA,CA 91109, USA. NR 31 TC 12 Z9 12 U1 0 U2 0 PU ACADEMIC PRESS INC JNL-COMP SUBSCRIPTIONS PI SAN DIEGO PA 525 B ST, STE 1900, SAN DIEGO, CA 92101-4495 SN 0019-1035 J9 ICARUS JI Icarus PD FEB PY 1993 VL 101 IS 2 BP 223 EP 233 DI 10.1006/icar.1993.1020 PG 11 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA KR334 UT WOS:A1993KR33400005 ER PT J AU KILLEN, RM MORGAN, TH AF KILLEN, RM MORGAN, TH TI MAINTAINING THE NA ATMOSPHERE OF MERCURY SO ICARUS LA English DT Article ID GRAIN-BOUNDARY DIFFUSION; SINGLE-IMPACT HYPOTHESIS; DETECTING POTASSIUM; MASS-SPECTROMETRY; SODIUM; MOON; MAGNETOSPHERE; SURFACE; SYSTEMS; ORIGIN C1 NASA HEADQUARTERS,WASHINGTON,DC 20546. RP KILLEN, RM (reprint author), UNIV MARYLAND,DEPT METEOROL,2213 COMP & SPACE SCI BLDG,COLL PK,MD 20742, USA. RI Morgan, Thomas/I-5943-2013 NR 90 TC 23 Z9 23 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 FEB PY 1993 VL 101 IS 2 BP 293 EP 312 DI 10.1006/icar.1993.1026 PG 20 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA KR334 UT WOS:A1993KR33400011 ER PT J AU Miller, RE Paul, S AF Miller, Raymond E. Paul, Sanjoy TI On the Generation of Minimal-Length Conformance Tests for Communication Protocols SO IEEE-ACM TRANSACTIONS ON NETWORKING LA English DT Article AB A new technique of generating a test sequence for conformance testing of communication protocols is presented. This approach shows that it is possible to generate optimal-length test sequences which include multiple unique input/output (UIO) sequences and overlapping under certain conditions. In the absence of the above-mentioned conditions, a heuristic technique is used to obtain suboptimal solutions which show significant improvement over optimal solutions without overlapping. We illustrate our technique on a practical example: the NBS Class 4 Transport Protocol (TP4). We also compare the computational complexity of our algorithm with that of existing techniques. Finally, a brief discussion of bounds on test sequence length is presented, and our results are compared against these bounds. C1 [Miller, Raymond E.] Univ Maryland, Dept Comp Sci, College Pk, MD 20742 USA. [Miller, Raymond E.] NASA, Ctr Excellence Space Data & Informat Sci, Goddard Space Flight Ctr, Greenbelt, MD 20771 USA. [Paul, Sanjoy] Univ Maryland, Dept Elect Engn, College Pk, MD 20742 USA. RP Miller, RE (reprint author), Univ Maryland, Dept Comp Sci, College Pk, MD 20742 USA. NR 19 TC 26 Z9 26 U1 0 U2 0 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI PISCATAWAY PA 445 HOES LANE, PISCATAWAY, NJ 08855-4141 USA SN 1063-6692 J9 IEEE ACM T NETWORK JI IEEE-ACM Trans. Netw. PD FEB PY 1993 VL 1 IS 1 BP 116 EP 129 DI 10.1109/90.222912 PG 14 WC Computer Science, Hardware & Architecture; Computer Science, Theory & Methods; Engineering, Electrical & Electronic; Telecommunications SC Computer Science; Engineering; Telecommunications GA V20QQ UT WOS:000208154900010 ER PT J AU IRANI, KB CHENG, J FAYYAD, UM QIAN, ZG AF IRANI, KB CHENG, J FAYYAD, UM QIAN, ZG TI APPLYING MACHINE LEARNING TO SEMICONDUCTOR MANUFACTURING SO IEEE EXPERT-INTELLIGENT SYSTEMS & THEIR APPLICATIONS LA English DT Article C1 JET PROP LAB,AI GRP,M-S 525-3660,PASADENA,CA 91109. UNIV MICHIGAN,ANN ARBOR,MI 48109. FORD MOTOR CO,ENGINE RES DEPT,RES LAB,DEARBORN,MI 48121. GM CORP,RES LABS,ARTIFICIAL INTELLIGENCE SERV,ELECTR DATA SERV,DETROIT,MI 48202. NR 12 TC 29 Z9 29 U1 2 U2 4 PU IEEE COMPUTER SOC PI LOS ALAMITOS PA 10662 LOS VAQUEROS CIRCLE, PO BOX 3014, LOS ALAMITOS, CA 90720-1264 SN 0885-9000 J9 IEEE EXPERT JI IEEE Expert-Intell. Syst. Appl. PD FEB PY 1993 VL 8 IS 1 BP 41 EP 47 DI 10.1109/64.193054 PG 7 WC Computer Science, Artificial Intelligence; Engineering, Electrical & Electronic SC Computer Science; Engineering GA KK868 UT WOS:A1993KK86800008 ER PT J AU BAKER, KR YU, AW KRAINAK, MA AF BAKER, KR YU, AW KRAINAK, MA TI DIRECT-DETECTION FREE-SPACE OPTICAL COMMUNICATIONS LINK USING A 1 MU-M WAVELENGTH LASER DIODE TRANSMITTER SO IEEE PHOTONICS TECHNOLOGY LETTERS LA English DT Article AB We report on the performance of a 1.047 mum wavelength semiconductor laser diode in a 50 Mbps free-space communications experiment. This laser diode at 1.047 mum makes it possible to construct high-power master oscillator power amplifier (MOPA) transmitters for space communications. The MOPA system would consist of the diode and a Nd-doped crystal amplifier. We have demonstrated a 200 photons/bit sensitivity at a bit error rate of 10(-6) and have characterized the performance parameters pertinent to the construction of a MOPA laser. To our knowledge, this is the highest direct detection sensitivity at this wavelength reported to date. C1 HUGHES STX CORP,LANHAM,MD 20706. NASA,GODDARD SPACE FLIGHT CTR,PHOTON BRANCH,GREENBELT,MD 20771. RP BAKER, KR (reprint author), VIRGINIA POLYTECHN INST & STATE UNIV,BRADLEY DEPT ELECT ENGN,BLACKSBURG,VA 24061, USA. NR 8 TC 4 Z9 4 U1 0 U2 2 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 1041-1135 J9 IEEE PHOTONIC TECH L JI IEEE Photonics Technol. Lett. PD FEB PY 1993 VL 5 IS 2 BP 260 EP 262 DI 10.1109/68.196024 PG 3 WC Engineering, Electrical & Electronic; Optics; Physics, Applied SC Engineering; Optics; Physics GA KN746 UT WOS:A1993KN74600049 ER PT J AU MOGHADDAM, M CHEW, WC AF MOGHADDAM, M CHEW, WC TI STUDY OF SOME PRACTICAL ISSUES IN INVERSION WITH THE BORN ITERATIVE METHOD USING TIME-DOMAIN DATA SO IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION LA English DT Article ID DIFFRACTION TOMOGRAPHY; DIELECTRIC SLAB; 3 DIMENSIONS; SCATTERING; RECONSTRUCTION; PERMITTIVITY; ALGORITHM AB The performance of the Born iterative method of nonlinear two-dimensional profile inversion is examined for the reconstruction of large objects and in the presence of measurement noise. Time-domain data are used. It is shown that objects at least as large as about nine wavelengths can be inverted without any convergence problems. The algorithm is also shown to perform well in the presence of 10% noise, or 20 dB signal-to-noise ratio. The simultaneous inversion of permittivity and conductivity profiles is also formulated and solved using the Born iterative method. Objects with various loss tangents are reconstructed, and the limits of applicability of the algorithm are investigated. C1 UNIV ILLINOIS,DEPT ELECT & COMP ENGN,URBANA,IL 61801. RP MOGHADDAM, M (reprint author), JET PROP LAB,PASADENA,CA 91109, USA. RI Chew, Weng Cho/C-1792-2009 NR 28 TC 58 Z9 59 U1 1 U2 3 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0018-926X J9 IEEE T ANTENN PROPAG JI IEEE Trans. Antennas Propag. PD FEB PY 1993 VL 41 IS 2 BP 177 EP 184 DI 10.1109/8.214608 PG 8 WC Engineering, Electrical & Electronic; Telecommunications SC Engineering; Telecommunications GA LE052 UT WOS:A1993LE05200007 ER PT J AU ONYSZCHUK, IM CHEUNG, KM COLLINS, O AF ONYSZCHUK, IM CHEUNG, KM COLLINS, O TI QUANTIZATION LOSS IN CONVOLUTIONAL DECODING SO IEEE TRANSACTIONS ON COMMUNICATIONS LA English DT Letter AB We study the loss in quantizing coded symbols from the AWGN channel with BPSK or QPSK modulation. A new quantization scheme and branch metric calculation method are presented. For the uniformly quantized AWGN channel, cutoff rate is used to determine the stepsize and the smallest number of quantization bits needed for a given bit signal-to-noise ratio (E(b)/N0) loss. A 9-level quantizer is presented, along with 3-bit branch metrics for a rate 1/2 code, which causes an E(b)/N0 loss of only 0.14 dB. These results also apply to soft-decision decoding of block codes. A tight upper bound is derived for the range of path metrics in a Viterbi decoder. The calculations are verified by simulations of several convolutional codes, including the new memory 14, rate 1/4 or 1/6 codes used by the big Viterbi decoders at JPL. C1 JOHNS HOPKINS UNIV,DEPT ELECT ENGN,BALTIMORE,MD 21218. JET PROP LAB,PASADENA,CA 91109. NR 10 TC 16 Z9 16 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 0090-6778 J9 IEEE T COMMUN JI IEEE Trans. Commun. PD FEB PY 1993 VL 41 IS 2 BP 261 EP 265 DI 10.1109/26.216495 PG 5 WC Engineering, Electrical & Electronic; Telecommunications SC Engineering; Telecommunications GA LH401 UT WOS:A1993LH40100001 ER PT J AU LIENEWEG, U TOLMUNEN, T FRERKING, MA MASERJIAN, J AF LIENEWEG, U TOLMUNEN, T FRERKING, MA MASERJIAN, J TI MODELING OF PLANAR VARACTOR FREQUENCY-MULTIPLIER DEVICES WITH BLOCKING BARRIERS - REPLY SO IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES LA English DT Letter RP LIENEWEG, U (reprint author), JET PROP LAB,4800 OAK DR,PASADENA,CA 91109, USA. NR 1 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 FEB PY 1993 VL 41 IS 2 BP 362 EP 363 PG 2 WC Engineering, Electrical & Electronic SC Engineering GA LH109 UT WOS:A1993LH10900031 ER PT J AU DEKORVIN, A KLEYLE, R LEA, R AF DEKORVIN, A KLEYLE, R LEA, R TI THE OBJECT RECOGNITION PROBLEM WHEN FEATURES FAIL TO BE HOMOGENEOUS SO INTERNATIONAL JOURNAL OF APPROXIMATE REASONING LA English DT Article DE FEATURE VALUES; SENSORS; OBJECT IDENTIFICATION; PAY-OFFS ID DECISION-MAKING AB The goal of the present work is to obtain a reasonable solution to the problem of object identification. Sensors report on certain independent feature values of an object. The Dempster-Shafer theory is used to integrate the information coming from these independent sources. Moreover, the sensors do not report the feature values in a crisp manner. These values are only stochastically determined. Also, in the data base itself, objects only partially belong to classes determined by feature views. This might be due to the inability of the expert or expert system to pinpoint exactly the feature value of a given object. This setting naturally leads to applying the Dempster-Shafer theory to masses whose focal elements are fuzzy sets. A similar approach is taken to produce an economical solution to the problem of object identification. A set of sensors is picked based on performance evaluation. C1 UNIV HOUSTON,HOUSTON,TX 77004. INDIANA UNIV PURDUE UNIV,INDIANAPOLIS,IN. NASA,LYNDON B JOHNSON SPACE CTR,HOUSTON,TX 77058. NR 21 TC 4 Z9 4 U1 0 U2 0 PU ELSEVIER SCIENCE INC PI NEW YORK PA 655 AVENUE OF THE AMERICAS, NEW YORK, NY 10010 SN 0888-613X J9 INT J APPROX REASON JI Int. J. Approx. Reasoning PD FEB PY 1993 VL 8 IS 2 BP 141 EP 162 DI 10.1016/0888-613X(93)90025-9 PG 22 WC Computer Science, Artificial Intelligence SC Computer Science GA LM447 UT WOS:A1993LM44700004 ER PT J AU NWOKAH, ODI FRAZHO, AE LE, DK AF NWOKAH, ODI FRAZHO, AE LE, DK TI A NOTE ON DECENTRALIZED INTEGRAL CONTROLLABILITY SO INTERNATIONAL JOURNAL OF CONTROL LA English DT Article ID STABILITY; SYSTEMS AB A concept of decentralized integral controllability (DIC) defined on a given gain space PHI is clarified and related to the original definition given by Morari and Zafirou (1989). This leads to a simple proof of the existence of DIC on PHI from which can be routinely deduced existence conditions for DIC in the sense of Morari and Zafirou. C1 PURDUE UNIV,SCH PHARMACEUT SCI,W LAFAYETTE,IN 47907. NASA,LERC,CLEVELAND,OH 44135. RP NWOKAH, ODI (reprint author), PURDUE UNIV,SCH MECH ENGN,W LAFAYETTE,IN 47907, USA. NR 8 TC 3 Z9 3 U1 0 U2 0 PU TAYLOR & FRANCIS LTD PI LONDON PA ONE GUNDPOWDER SQUARE, LONDON, ENGLAND EC4A 3DE SN 0020-7179 J9 INT J CONTROL JI Int. J. Control PD FEB PY 1993 VL 57 IS 2 BP 485 EP 494 DI 10.1080/00207179308934401 PG 10 WC Automation & Control Systems SC Automation & Control Systems GA KL950 UT WOS:A1993KL95000016 ER PT J AU BOY, GA MATHE, N AF BOY, GA MATHE, N TI OPERATOR ASSISTANT SYSTEMS - AN EXPERIMENTAL APPROACH USING A TELEROBOTICS APPLICATION SO INTERNATIONAL JOURNAL OF INTELLIGENT SYSTEMS LA English DT Article AB This article presents a knowledge-based system methodology for developing Operator Assistant (OA) systems in dynamic and interactive environments. Recent results in human error studies show that automation appears to be the most critical factor in human-machine interaction problems. This is a problem both of training and design, which is the subject of this article. Design includes both design of the system to be controlled and design of procedures for operating this system. A specific knowledge representation is proposed for representing the corresponding system and operational knowledge. This representation is based on the situation recognition and analytical reasoning paradigm (SRAR). It tries to make explicit common factors involved in both human and machine intelligence, including perception and reasoning. An OA system based on this representation has been developed for space telerobotics. Simulations have been carried out with astronauts and the resulting protocols have been analyzed. Results show the relevance of the approach and have been used for improving the knowledge representation and the OA architecture. C1 NASA,AMES RES CTR,ARTIFICIAL INTELLIGENCE RES BRANCH,MOFFETT FIELD,CA 94035. RP BOY, GA (reprint author), EUROPEAN INST COGNIT SCI & ENGN,PROLOGUE 1,BP 27-25,F-31312 LABAGE,FRANCE. NR 36 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 0884-8173 J9 INT J INTELL SYST JI Int. J. Intell. Syst. PD FEB PY 1993 VL 8 IS 2 BP 271 EP 286 PG 16 WC Computer Science, Artificial Intelligence SC Computer Science GA KK855 UT WOS:A1993KK85500006 ER PT J AU Yao, MW Chait, A AF Yao, Minwu Chait, Arnon TI APPLICATION OF THE HOMOGRAPHIC APPROXIMATION IN THE ENTHALPY METHOD FOR PHASE CHANGE PROBLEMS SO INTERNATIONAL JOURNAL OF NUMERICAL METHODS FOR HEAT & FLUID FLOW LA English DT Article DE Homographic approximation; Enthalpy method; Stefan problem; Phase change; Finite difference method; Finite element method AB The homographic approximation, in which the Heaviside step function is replaced by a continuous smooth curve, is applied to the enthalpy method for heat transfer problems with isothermal phase change. Both the finite difference and finite element implementations, based on the basic enthalpy, the apparent heat capacity and the source term formulations, are considered. A 1-D Stefan problem of melting a solid is used as a test problem. The accuracy of the numerical solutions is measured globally using L-2 error norms and comparison is made between the solutions using homographic approximation and those using linear approximation. The advantages of using homographic approximation are examined. C1 [Yao, Minwu] Ohio Aerosp Inst, Book Pk, OH 44142 USA. [Chait, Arnon] NASA, Lewis Res Ctr, Cleveland, OH 44135 USA. RP Yao, MW (reprint author), Ohio Aerosp Inst, 22800 Cedar Point Rd, Book Pk, OH 44142 USA. FU NASA FX The authors would like to thank T. K. Glasgow of NASA Lewis Research Center and the other two anonymous referees for their valuable comments and useful input to this paper. This work is sponsored by the NASA's Microgravity Science and Application Program. NR 35 TC 3 Z9 3 U1 1 U2 2 PU EMERALD GROUP PUBLISHING LIMITED PI BINGLEY PA HOWARD HOUSE, WAGON LANE, BINGLEY BD16 1WA, W YORKSHIRE, ENGLAND SN 0961-5539 J9 INT J NUMER METHOD H JI Int. J. Numer. Methods Heat Fluid Flow PD FEB PY 1993 VL 3 IS 1 BP 157 EP 172 DI 10.1108/eb017523 PG 16 WC Thermodynamics; Mathematics, Interdisciplinary Applications; Mechanics SC Thermodynamics; Mathematics; Mechanics GA V29HL UT WOS:000208739400012 ER PT J AU ARMSTRONG, RA AF ARMSTRONG, RA TI REMOTE-SENSING OF SUBMERGED VEGETATION CANOPIES FOR BIOMASS ESTIMATION SO INTERNATIONAL JOURNAL OF REMOTE SENSING LA English DT Letter ID BAY AB The visible bands of the Landsat Thematic Mapper (TM) sensor were used in an empirical assessment of seagrass biomass on shallow banks near Lee Stocking Island in the Bahamas. The TM bands were transformed to minimize the depth-dependent variance in the bottom reflectance signal. Regression analyses were performed between the transformed bands and field measurements of seagrass standing crop (above-ground biomass). Regression equations using spectral data accounted for up to 80 per cent of the variability in seagrass biomass. The unexplained variance was ascribed to variations in bottom sediment colour. RP ARMSTRONG, RA (reprint author), NASA,AMES RES CTR,TGS TECHNOL INC,MAIL STOP 242-4,MOFFETT FIELD,CA 94035, USA. NR 12 TC 55 Z9 58 U1 2 U2 17 PU TAYLOR & FRANCIS LTD PI LONDON PA ONE GUNDPOWDER SQUARE, LONDON, ENGLAND EC4A 3DE SN 0143-1161 J9 INT J REMOTE SENS JI Int. J. Remote Sens. PD FEB PY 1993 VL 14 IS 3 BP 621 EP 627 PG 7 WC Remote Sensing; Imaging Science & Photographic Technology SC Remote Sensing; Imaging Science & Photographic Technology GA KN985 UT WOS:A1993KN98500016 ER PT J AU SMITH, RC BOWERS, KL AF SMITH, RC BOWERS, KL TI SINC-GALERKIN ESTIMATION OF DIFFUSIVITY IN PARABOLIC PROBLEMS SO INVERSE PROBLEMS LA English DT Article ID BOUNDARY-VALUE PROBLEMS AB A fully Sinc-Galerkin method for the numerical recovery of spatially varying diffusion coefficients in linear parabolic partial differential equations is presented. Because the parameter recovery problems are inherently ill-posed, an output error criterion in' conjunction with Tikhonov regularization is used to formulate them as infinite-dimensional minimization problems. The forward problems are discretized with a sinc basis in both the spatial 'and temporal domains thus yielding an approximate solution which displays an exponential convergence rate and is valid on the infinite time interval. The minimization problems are then solved via a quasi-Newton/trust region algorithm. The L-curve technique for determining an appropriate value of the regularization parameter is briefly discussed, and numerical examples are given which demonstrate the applicability of the method both for problems with noise-free data as well as for those whose data contain white noise. C1 MONTANA STATE UNIV,DEPT MATH SCI,BOZEMAN,MT 59717. RP SMITH, RC (reprint author), NASA,LANGLEY RES CTR,INST COMP APPLICAT SCI & ENGN,HAMPTON,VA 23681, USA. NR 22 TC 21 Z9 21 U1 0 U2 0 PU IOP PUBLISHING LTD PI BRISTOL PA TECHNO HOUSE, REDCLIFFE WAY, BRISTOL, ENGLAND BS1 6NX SN 0266-5611 J9 INVERSE PROBL JI Inverse Probl. PD FEB PY 1993 VL 9 IS 1 BP 113 EP 135 DI 10.1088/0266-5611/9/1/007 PG 23 WC Mathematics, Applied; Physics, Mathematical SC Mathematics; Physics GA KN740 UT WOS:A1993KN74000007 ER PT J AU SHORT, DA SHIMIZU, K KEDEM, B AF SHORT, DA SHIMIZU, K KEDEM, B TI OPTIMAL THRESHOLDS FOR THE ESTIMATION OF AREA RAIN-RATE MOMENTS BY THE THRESHOLD METHOD SO JOURNAL OF APPLIED METEOROLOGY LA English DT Article; Proceedings Paper CT 3RD INTERNATIONAL CONF ON MESOSCALE PRECIPITATION : HYDROLOGIC AND METEOROLOGICAL ASPECTS CY FEB 27-MAR 01, 1991 CL COLLEGE STN, TX SP AMER METEOL SOC, AMER GEOPHYS UNION, NASA, NATL SCI FDN, TEXAS INST OCEANOG ID MICROWAVE RADIOMETER; CONVECTIVE RAINFALL; INTEGRALS AB Optimization of the threshold method, achieved by determination of the threshold that maximizes the correlation between an area-average rain-rate moment and the area coverage of rain rates exceeding the threshold, is demonstrated empirically and theoretically. Empirical results for a sequence of GATE radar snapshots show optimal thresholds of 5 and 27 mm h-1 for the first and second moments, respectively. Theoretical optimization of the threshold method by the maximum-likelihood approach of Kedem and Pavlopoulos predicts optimal thresholds near 5 and 26 mm h-1 for lognormally distributed rain rates with GATE-like parameters. The agreement between theory and observations suggests that the optimal threshold can be understood as arising due to sampling variations, from snapshot to snapshot, of a parent rain-rate distribution. Optimal thresholds for gamma and inverse Gaussian distributions are also derived and compared. C1 SCI UNIV TOKYO,DEPT APPL MATH,TOKYO 162,JAPAN. UNIV MARYLAND,DEPT MATH,COLL PK,MD 20742. RP SHORT, DA (reprint author), NASA,GODDARD SPACE FLIGHT CTR,ATMOSPHERES LAB,CODE 913,GREENBELT,MD 20771, USA. NR 31 TC 21 Z9 21 U1 0 U2 0 PU AMER METEOROLOGICAL SOC PI BOSTON PA 45 BEACON ST, BOSTON, MA 02108-3693 SN 0894-8763 J9 J APPL METEOROL JI J. Appl. Meteorol. PD FEB PY 1993 VL 32 IS 2 BP 182 EP 192 DI 10.1175/1520-0450(1993)032<0182:OTFTEO>2.0.CO;2 PG 11 WC Meteorology & Atmospheric Sciences SC Meteorology & Atmospheric Sciences GA KL909 UT WOS:A1993KL90900005 ER PT J AU BELL, TL REID, N AF BELL, TL REID, N TI DETECTING THE DIURNAL CYCLE OF RAINFALL USING SATELLITE-OBSERVATIONS SO JOURNAL OF APPLIED METEOROLOGY LA English DT Article; Proceedings Paper CT 3RD INTERNATIONAL CONF ON MESOSCALE PRECIPITATION : HYDROLOGIC AND METEOROLOGICAL ASPECTS CY FEB 27-MAR 01, 1991 CL COLLEGE STN, TX SP AMER METEOL SOC, AMER GEOPHYS UNION, NASA, NATL SCI FDN, TEXAS INST OCEANOG ID TIME STOCHASTIC-MODEL; TROPICAL PACIFIC; GATE; CONVECTION; CLOUD; VARIABILITY; STATISTICS; AREA AB The diurnal cycle in rainfall varies considerably from region to region in the tropics. Determining this variability is important both for comparing predictions of atmospheric models to real atmospheric behavior and for making sure that estimates of total rainfall from low-altitude satellites am not biased because of their infrequent observations of a given region of the earth. Although there are no data from the proposed Tropical Rainfall Measuring Mission (TRMM) satellite to work with yet, we can ask how well the diurnal cycle in rainfall will be detected when the satellite is eventually collecting data, given the satellites proposed sampling characteristics. Data analyses for the diurnal cycle are discussed, taking into account the fact that the satellite visits will be irregularly spaced in time. The amplitudes of the first few harmonics will be determined by least-squares fits to the satellite observations, and the tests needed to establish the statistical significance of the fitted amplitudes are discussed. The accuracy with which the first few harmonics of the diurnal cycle can be detected is estimated from several months of satellite data using rainfall statistics observed during the GARP (Global Atmospheric Research Program) Atlantic Tropical Experiment (GATE). C1 UNIV TORONTO,DEPT STAT,TORONTO M5S 1A1,ONTARIO,CANADA. RP BELL, TL (reprint author), NASA,GODDARD SPACE FLIGHT CTR,ATMOSPHERES LAB,CODE 913,GREENBELT,MD 20771, USA. RI Bell, Thomas/G-5425-2012; Reid, Nancy/B-8234-2013 NR 33 TC 36 Z9 37 U1 0 U2 2 PU AMER METEOROLOGICAL SOC PI BOSTON PA 45 BEACON ST, BOSTON, MA 02108-3693 SN 0894-8763 J9 J APPL METEOROL JI J. Appl. Meteorol. PD FEB PY 1993 VL 32 IS 2 BP 311 EP 322 DI 10.1175/1520-0450(1993)032<0311:DTDCOR>2.0.CO;2 PG 12 WC Meteorology & Atmospheric Sciences SC Meteorology & Atmospheric Sciences GA KL909 UT WOS:A1993KL90900014 ER PT J AU CHIU, LS CHANG, ATC JANOWIAK, J AF CHIU, LS CHANG, ATC JANOWIAK, J TI COMPARISON OF MONTHLY RAIN RATES DERIVED FROM GPI AND SSM/I USING PROBABILITY-DISTRIBUTION FUNCTIONS SO JOURNAL OF APPLIED METEOROLOGY LA English DT Article; Proceedings Paper CT 3RD INTERNATIONAL CONF ON MESOSCALE PRECIPITATION : HYDROLOGIC AND METEOROLOGICAL ASPECTS CY FEB 27-MAR 01, 1991 CL COLLEGE STN, TX SP AMER METEOL SOC, AMER GEOPHYS UNION, NASA, NATL SCI FDN, TEXAS INST OCEANOG ID PRECIPITATION; OCEANS; 30-DEGREES-S AB Three years of monthly rain rates over 5-degrees x 5-degrees latitude-longitude boxes have been calculated for oceanic regions 50-degrees-N-50-degrees-S from measurements taken by the Special Sensor Microwave/Imager on board the Defense Meteorological Satellite Program satellites using the technique developed by Wilheit et al. The annual and seasonal zonal-mean rain rates are larger than Jaeger's climatological estimates but are smaller than those estimated from the GOES precipitation index (GPI) for the same period. Regional comparison with the GPI showed that these rain rates are smaller in the north Indian Ocean and in the southern extratropics where the GPI is known to overestimate. The differences are also dominated by a jump at 170-degrees-W in the GPI rain rates across the mid Pacific Ocean. This jump is attributed to the fusion of different satellite measurements in producing the GPI. C1 NASA,GODDARD SPACE FLIGHT CTR,HYDROL SCI BRANCH,GREENBELT,MD 20771. NOAA,NMC,CAC,CTR CLIMATE ANAL,WASHINGTON,DC 20230. RP CHIU, LS (reprint author), GEN SCI CORP,61 CHEVY CHASE DR,LAUREL,MD 20707, USA. NR 24 TC 33 Z9 33 U1 0 U2 1 PU AMER METEOROLOGICAL SOC PI BOSTON PA 45 BEACON ST, BOSTON, MA 02108-3693 SN 0894-8763 J9 J APPL METEOROL JI J. Appl. Meteorol. PD FEB PY 1993 VL 32 IS 2 BP 323 EP 334 DI 10.1175/1520-0450(1993)032<0323:COMRRD>2.0.CO;2 PG 12 WC Meteorology & Atmospheric Sciences SC Meteorology & Atmospheric Sciences GA KL909 UT WOS:A1993KL90900015 ER PT J AU ADLER, RF NEGRI, AJ KEEHN, PR HAKKARINEN, IM AF ADLER, RF NEGRI, AJ KEEHN, PR HAKKARINEN, IM TI ESTIMATION OF MONTHLY RAINFALL OVER JAPAN AND SURROUNDING WATERS FROM A COMBINATION OF LOW-ORBIT MICROWAVE AND GEOSYNCHRONOUS IR DATA SO JOURNAL OF APPLIED METEOROLOGY LA English DT Article; Proceedings Paper CT 3RD INTERNATIONAL CONF ON MESOSCALE PRECIPITATION : HYDROLOGIC AND METEOROLOGICAL ASPECTS CY FEB 27-MAR 01, 1991 CL COLLEGE STN, TX SP AMER METEOL SOC, AMER GEOPHYS UNION, NASA, NATL SCI FDN, TEXAS INST OCEANOG ID CLOUD AB This paper describes a method to combine geosynchronous IR and low-orbit microwave data to estimate mean monthly rainfall useful for climate studies. The IR data have the advantage of high time resolution (important for rapidly changing precipitation patterns and for the detection of diurnal signals) but lack a strong physical connection between the remotely sensed signal and the surface rainfall. The microwave data provide a stronger relation between the radiance and the rainfall but provide poor time sampling of the rainfall signal. The microwave technique uses the brightness temperature at 37 and 86 GHz from the Special Sensor Microwave/Imager instrument on board the Defense Meteorological Satellite Program (DMSP) satellite to define raining areas over water and land and uses the 86-GHz scattering signal to assign rain rate based on cloud model-microwave calculations. The microwave results are generally good for with individual swaths and monthly totals, except for a glaring underestimation of shallow, orographic rain systems over the southern coast of Japan. The IR techniques used are the GOES precipitation index of Arkin and Meisner and the convective-stratiform technique of Adler and Negri. Initially the IR estimates are computed separately using hourly data from the Japanese Geostationary Meteorological Satellite. Calibration or adjustment factors are derived by dividing the microwave monthly estimate by a second IR estimate (made with the microwave sampling thal simulates the observations from an IR radiometer on board the DMSP satellite). The spatial array of coefficients are then multiplied by the original IR monthly estimates (produced from all the hourly data) to produce the merged IR-microwave monthly estimates. The results show that in areas where the base (microwave) technique performs well, that is, has a relatively small bias, the combined microwave-IR monthly total estimates have better error statistics than either the microwave or IR techniques individually. C1 SCI SYST & APPLICAT INC,SEABROOK,MD. GEN SCI CORP,LAUREL,MD. RP ADLER, RF (reprint author), NASA,GODDARD SPACE FLIGHT CTR,CODE 912,GREENBELT,MD 20771, USA. NR 9 TC 170 Z9 174 U1 0 U2 0 PU AMER METEOROLOGICAL SOC PI BOSTON PA 45 BEACON ST, BOSTON, MA 02108-3693 SN 0894-8763 J9 J APPL METEOROL JI J. Appl. Meteorol. PD FEB PY 1993 VL 32 IS 2 BP 335 EP 356 DI 10.1175/1520-0450(1993)032<0335:EOMROJ>2.0.CO;2 PG 22 WC Meteorology & Atmospheric Sciences SC Meteorology & Atmospheric Sciences GA KL909 UT WOS:A1993KL90900016 ER PT J AU NEGRI, AJ ADLER, RF AF NEGRI, AJ ADLER, RF TI AN INTERCOMPARISON OF 3 SATELLITE INFRARED RAINFALL TECHNIQUES OVER JAPAN AND SURROUNDING WATERS SO JOURNAL OF APPLIED METEOROLOGY LA English DT Article; Proceedings Paper CT 3RD INTERNATIONAL CONF ON MESOSCALE PRECIPITATION : HYDROLOGIC AND METEOROLOGICAL ASPECTS CY FEB 27-MAR 01, 1991 CL COLLEGE STN, TX SP AMER METEOL SOC, AMER GEOPHYS UNION, NASA, NATL SCI FDN, TEXAS INST OCEANOG AB This paper compares and contrasts three satellite infrared methods of estimating rainfall. The World Climate Research Programme's Global Precipitation Climatology Project held its first algorithm intercomparison during June-August 1989 over the Japanese archipelago and surroundings. The GOES precipitation index (GPI), the Negri-Adler-Wetzel Technique, and the convective-stratiform technique (CST) were applied to hourly infrared imagery. A network of radar data calibrated by a dense raingage network was used as ground truth but withheld from the investigators until after submission of the satellite estimates. Scattering signatures in concurrent 86-GHz brightness temperatures from the Special Sensor Microwave/Imager were used to develop a method to discriminate nonraining cirrus from active convection in two of the infrared techniques. All three of the IR techniques did poorly in estimating the rain maxima over southeastern Japan associated with shallow orographic (warm) rain systems. The statistics for the combined 2-month dataset for both land and ocean (1.25-degrees grid boxes) indicated that the GPI had the lowest bias (30 mm or 25% of the radar mean) but also a low correlation (.48) and high root-mean-square error (rmse) (103 mm or 87% of the mean). This was due to the GPI's overestimate in June (bias was 92 mm) and underestimate in July-August (bias was -32 mm). Despite its increased sophistication, the CST had an rmse of 104 mm, with a large negative bias (-70 mm) but a higher correlation coefficient (0.66). When the dataset was limited to the ocean-only points (to remove the effect of the shallow orographic precipitation), new statistics emerged. Under these restrictions, and for this limited dataset, the CST performed best, with the lowest bias (-39 mm or 42% of the mean), the lowest rmse (65 mm or 71% of the mean), and the highest correlation (0.79). It is believed that the lower scatter (higher correlation) of the CST and NAWT with respect to the GPI is due to the discrimination of thin cirrus used in both the NAWT and CST. Daily rainfall estimates had rms errors of almost 200% of the mean and negative biases of about 50% of the mean. Hourly estimates 1.25-degrees grid boxes had rms errors of 200%-300% of the mean and negative biases of order 100% of the mean. Spatial averaging to 2.5-degrees showed a slight improvement in these statistics. Despite the poor performance on hourly scales, the satellite techniques were able to identify diurnal signals when averaged over 1 month. RP NEGRI, AJ (reprint author), NASA,GODDARD SPACE FLIGHT CTR,ATMOSPHERES LAB,CODE 912,GREENBELT,MD 20771, USA. NR 17 TC 55 Z9 56 U1 0 U2 1 PU AMER METEOROLOGICAL SOC PI BOSTON PA 45 BEACON ST, BOSTON, MA 02108-3693 SN 0894-8763 J9 J APPL METEOROL JI J. Appl. Meteorol. PD FEB PY 1993 VL 32 IS 2 BP 357 EP 373 DI 10.1175/1520-0450(1993)032<0357:AIOTSI>2.0.CO;2 PG 17 WC Meteorology & Atmospheric Sciences SC Meteorology & Atmospheric Sciences GA KL909 UT WOS:A1993KL90900017 ER PT J AU MENEGHINI, R JONES, JA AF MENEGHINI, R JONES, JA TI AN APPROACH TO ESTIMATE THE AREA RAIN-RATE DISTRIBUTION FROM SPACEBORNE RADAR BY THE USE OF MULTIPLE THRESHOLDS SO JOURNAL OF APPLIED METEOROLOGY LA English DT Article; Proceedings Paper CT 3RD INTERNATIONAL CONF ON MESOSCALE PRECIPITATION : HYDROLOGIC AND METEOROLOGICAL ASPECTS CY FEB 27-MAR 01, 1991 CL COLLEGE STN, TX SP AMER METEOL SOC, AMER GEOPHYS UNION, NASA, NATL SCI FDN, TEXAS INST OCEANOG ID CONVECTIVE RAINFALL; INTEGRALS AB Estimates of rain rate derived from a spaceborne weather radar will be most reliable over an intermediate range of values. At light or heavy rain rates, where the signal-to-noise ratios are degraded either by small values of the backscattered power or by large attenuation. the accuracy will be poor. In forming an area average of the rain rate, an alternative to the averaging of the high-resolution estimates, irrespective of their individual accuracies, is a multiple threshold approach. The method is based on the fact that the fractional area above a particular rain-rate threshold R(j) is related to the cumulative distribution of rain rates evaluated at R(j). Varying the threshold over the effective dynamic range of the radar yields the cumulative distribution function over this range. To obtain the distribution at all rain rates, a lognormal or gamma test function is selected such that the mean-square error between the test function and the measured values is minimized. Once the unknown parameters are determined, the first-order statistics of the areawide rain-rate distribution can be found. Tests of the method with data from the SPANDAR radar provide comparisons between it and the single threshold and the direct averaging approaches. C1 HUGHES STX CORP,LANHAM,MD. RP MENEGHINI, R (reprint author), NASA,GODDARD SPACE FLIGHT CTR,CODE 975,GREENBELT,MD 20771, USA. NR 12 TC 22 Z9 22 U1 0 U2 0 PU AMER METEOROLOGICAL SOC PI BOSTON PA 45 BEACON ST, BOSTON, MA 02108-3693 SN 0894-8763 J9 J APPL METEOROL JI J. Appl. Meteorol. PD FEB PY 1993 VL 32 IS 2 BP 386 EP 398 DI 10.1175/1520-0450(1993)032<0386:AATETA>2.0.CO;2 PG 13 WC Meteorology & Atmospheric Sciences SC Meteorology & Atmospheric Sciences GA KL909 UT WOS:A1993KL90900019 ER PT J AU ATLAS, D ROSENFELD, D WOLFF, DB AF ATLAS, D ROSENFELD, D WOLFF, DB TI C-BAND ATTENUATION BY TROPICAL RAINFALL IN DARWIN, AUSTRALIA, USING CLIMATOLOGICALLY TUNED ZE-R RELATIONS SO JOURNAL OF APPLIED METEOROLOGY LA English DT Article; Proceedings Paper CT 3RD INTERNATIONAL CONF ON MESOSCALE PRECIPITATION : HYDROLOGIC AND METEOROLOGICAL ASPECTS CY FEB 27-MAR 01, 1991 CL COLLEGE STN, TX SP AMER METEOL SOC, AMER GEOPHYS UNION, NASA, NATL SCI FDN, TEXAS INST OCEANOG ID INTEGRALS AB The probability matching method (PMM) is used as a basis for estimating attenuation in tropical rains near Darwin, Australia. PMM provides a climatological relationship between measured radar reflectivity and rain rate, which includes the effects of rain and cloud attenuation. When the radar sample is representative, PMM estimates the rainfall without bias. When the data are stratified for greater than average rates, the method no longer compensates for the higher attenuation and the radar rainfall estimates are biased low. The uncompensated attenuation is used to estimate the climatological attenuation coefficient. The method is applicable to any wavelength. The two-way attenuation coefficient was found to be 0.0085 dB km-1 (mm h-1)-1.08 for the tropical rains and associated clouds in Darwin for the first 2 months of the year for horizontally polarized radiation at 5.63 GHz. This unusually large value is discussed. The risks of making real-time corrections for attenuation are also treated. C1 NASA,GODDARD SPACE FLIGHT CTR,CODE 975,GREENBELT,MD 20771. JET PROP LAB,PASADENA,CA 91109. HEBREW UNIV JERUSALEM,JERUSALEM,ISRAEL. APPL RES CORP,LANDOVER,MD. RI Rosenfeld, Daniel/F-6077-2016 OI Rosenfeld, Daniel/0000-0002-0784-7656 NR 11 TC 6 Z9 6 U1 0 U2 0 PU AMER METEOROLOGICAL SOC PI BOSTON PA 45 BEACON ST, BOSTON, MA 02108-3693 SN 0894-8763 J9 J APPL METEOROL JI J. Appl. Meteorol. PD FEB PY 1993 VL 32 IS 2 BP 426 EP 430 DI 10.1175/1520-0450(1993)032<0426:CBABTR>2.0.CO;2 PG 5 WC Meteorology & Atmospheric Sciences SC Meteorology & Atmospheric Sciences GA KL909 UT WOS:A1993KL90900022 ER PT J AU KUMAGAI, H MENEGHINI, R KOZU, T AF KUMAGAI, H MENEGHINI, R KOZU, T TI PRELIMINARY-RESULTS FROM MULTIPARAMETER AIRBORNE RAIN RADAR MEASUREMENT IN THE WESTERN PACIFIC SO JOURNAL OF APPLIED METEOROLOGY LA English DT Article; Proceedings Paper CT 3RD INTERNATIONAL CONF ON MESOSCALE PRECIPITATION : HYDROLOGIC AND METEOROLOGICAL ASPECTS CY FEB 27-MAR 01, 1991 CL COLLEGE STN, TX SP AMER METEOL SOC, AMER GEOPHYS UNION, NASA, NATL SCI FDN, TEXAS INST OCEANOG ID COLORADO CONVECTIVE STORMS; MEASURING MISSION; POLARIZATION; SCATTERING; PRECIPITATION; HYDROMETEORS; WAVES; HAIL AB Preliminary results are presented from multiparameter airborne radar measurements of tropical storms. The experiment was conducted in the western Pacific in September 1990 with the NASA DC-8 aircraft that was equipped with a dual-wavelength radar at X and Ka bands and several microwave radiometers. The modification to dual-polarization at X-band radar enabled measurements of the linear depolarization ratio (LDR). Vertical profiles of dual-polarization and dual-frequency observables for an example of stratiform rain and three examples of convective rain cells are examined. It is shown that at nadir incidence the LDR measurement often can be used to distinguish the phase states of hydrometeors and to identify the melting layer. In addition to the information concerning particle shape and orientation from LDR, the ratio of the radar reflectivity factors in two frequency bands (X and Ka bands) provides insight into particle size. The capabilities of dual-wavelength and dual-polarization radar in the identification of particle size and phase will be important considerations in the design of future spaceborne wealth radars. C1 NASA,GEORGE C MARSHALL SPACE FLIGHT CTR,CODE 975,HUNTSVILLE,AL 35812. NATL SPACE DEV AGCY JAPAN,MINATO KU,TOKYO,JAPAN. NR 27 TC 13 Z9 13 U1 0 U2 0 PU AMER METEOROLOGICAL SOC PI BOSTON PA 45 BEACON ST, BOSTON, MA 02108-3693 SN 0894-8763 J9 J APPL METEOROL JI J. Appl. Meteorol. PD FEB PY 1993 VL 32 IS 2 BP 431 EP 440 DI 10.1175/1520-0450(1993)032<0431:PRFMAR>2.0.CO;2 PG 10 WC Meteorology & Atmospheric Sciences SC Meteorology & Atmospheric Sciences GA KL909 UT WOS:A1993KL90900023 ER PT J AU ADAMS, GR HARRIS, RT WOODARD, D DUDLEY, GA AF ADAMS, GR HARRIS, RT WOODARD, D DUDLEY, GA TI MAPPING OF ELECTRICAL MUSCLE STIMULATION USING MRI SO JOURNAL OF APPLIED PHYSIOLOGY LA English DT Article DE ELECTROMYOSTIMULATION; MAGNETIC RESONANCE IMAGING ID SKELETAL-MUSCLE; MAGNETIC-RESONANCE; QUADRICEPS FEMORIS; MOTOR UNITS; EXERCISE; SPECTROSCOPY; ACTIVATION; METABOLISM; VOLUNTARY; HINDLIMB AB The purpose of this study was to map the pattern of muscle contractile activity elicited by electromyostimulation (EMS). A secondary interest was to determine whether EMS evoked a different pattern of contractile activity than voluntary (VOL) efforts. These objectives were addressed by examining the pattern and extent of contrast shift in magnetic resonance (MR) images after isometric actions of the left m. quadriceps of seven subjects had been elicited by EMS (1-s train of 500-mus sine wave pulses at 50 Hz) or by VOL means. For both conditions, five sets of 10 muscle actions were executed at each of the three force levels equal to 25, 50, and 75% of maximal VOL isometric torque. There were 1-s, 1.5-min, and 30-min rests between muscle actions, sets, and torque levels, respectively. Transaxial proton MR images (TR/TE = 2,000/30, 60) of m. quadriceps femoris were obtained with a 1.5-T imager at rest and after completion of the five sets of isometric actions at each force level. MR image contrast shift, as indicated by T2 values > 1 SD above the mean resting muscle T2, was calculated per pixel. Torque declined approximately 18% (P < 0.05) during each EMS set independent of the preset relative force level but recovered between sets. EMS increased T2 values above rest (29 +/- 0.2 to 36 +/- 0.5, P < 0.05) in regions of muscle dispersed throughout a given cross section. The pattern of muscle stimulation, as reflected by increased T2 values, varied markedly among subjects. VOL efforts did not cause fatigue nor appreciably increase T2 [13% of m. quadriceps femoris cross-sectional area showed an elevated (P < 0.05) T2 at the highest relative force]. The results suggest that the location of muscle stimulated via EMS cannot be taken for granted across subjects. It is also suggested that EMS stimulates the same fibers repeatedly, thereby increasing metabolic demand and T2 values. VOL efforts, in contrast, appear to be performed by more diffuse asychronous activation of skeletal muscle even at forces up to 75% of maximal to maintain performance. C1 NASA,BIOMED OPERAT & RES OFF,KENNEDY SPACE CTR,FL 32899. OHIO UNIV,DEPT BIOL SCI,ATHENS,OH 45701. RP ADAMS, GR (reprint author), BIONET CORP,BIOMED & ENVIRONM LABS,KENNEDY SPACE CTR,FL 32899, USA. NR 35 TC 194 Z9 196 U1 0 U2 18 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 FEB PY 1993 VL 74 IS 2 BP 532 EP 537 PG 6 WC Physiology; Sport Sciences SC Physiology; Sport Sciences GA KN704 UT WOS:A1993KN70400005 PM 8458767 ER PT J AU ADAMS, GR HATHER, BM BALDWIN, KM DUDLEY, GA AF ADAMS, GR HATHER, BM BALDWIN, KM DUDLEY, GA TI SKELETAL-MUSCLE MYOSIN HEAVY-CHAIN COMPOSITION AND RESISTANCE TRAINING SO JOURNAL OF APPLIED PHYSIOLOGY LA English DT Article DE HUMAN SKELETAL MUSCLE; EXERCISE; MUSCLE FIBER TYPE ID MYOFIBRILLAR ATPASE ACTIVITY; SINGLE FIBERS; RABBIT MUSCLE; ADAPTATIONS; EXPRESSION; STRENGTH AB We recently reported that 19 wk of heavy resistance training caused a decrease in the percentage of type IIb and ah increase in the percentage of type IIa fibers as determined by qualitative histochemical analyses of myofibrillar adenosinetriphosphatase activity of biopsies of musculus vastus lateralis (Hather et al. Acta Physiol. Scand. 143: 177-185, 1991). These data were interpretated to suggest that resistance training had caused transformation among the fast-twitch fiber subtypes. To more clearly establish the influence of resistance training on muscle fiber composition, biopsies from the original study were analyzed biochemically for myosin heavy chain (MHC) composition by use of sodium dodecyl sulfate-polyacrylamide gel electrophoresis and histochemically for fiber types by use of myofibrillar adenosinetriphosphatase activity. The results show that after training (n = 13), IIb MHC composition decreased (P < 0.05) from 19 +/- 4 to 7 +/- 1%. IIa MHC, in contrast, increased (P < 0.05) from 48 +/- 3 to 60 +/- 2%. These responses were essentially mirrored by alterations in fiber type distribution. The percentage of type IIb fibers decreased (P < 0.05) from 18 +/- 3 to 1 +/- 1%, whereas the percentage of type IIa fibers increased from 46 +/- 4 to 60 +/- 3% (P < 0.05). Neither I MHC composition nor type I fiber percentage changed with training. The control group (n = 4) showed no changes in MHC composition or fiber type distribution. These results suggest that heavy resistance training alters MHC composition in human skeletal muscle, presumably reflecting a change in genetic expression. C1 UNIV CALIF IRVINE,DEPT PHYSIOL & BIOPHYS,IRVINE,CA 92717. NASA,BIONET CORP,BIOMED & ENVIRONM LABS,KENNEDY SPACE CTR,FL 32899. NASA,BIOMED OPERAT & RES OFF,KENNEDY SPACE CTR,FL 32899. NR 28 TC 170 Z9 171 U1 1 U2 13 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 FEB PY 1993 VL 74 IS 2 BP 911 EP 915 PG 5 WC Physiology; Sport Sciences SC Physiology; Sport Sciences GA KN704 UT WOS:A1993KN70400059 PM 8458814 ER PT J AU PARAZYNSKI, SE TUCKER, BJ ARATOW, M CRENSHAW, A HARGENS, AR AF PARAZYNSKI, SE TUCKER, BJ ARATOW, M CRENSHAW, A HARGENS, AR TI DIRECT MEASUREMENT OF CAPILLARY BLOOD-PRESSURE IN THE HUMAN LIP SO JOURNAL OF APPLIED PHYSIOLOGY LA English DT Note DE POSTCAPILLARY VENULE PRESSURE; SERVO-NULLING TECHNIQUE; MICROPRESSURES; MICROPIPETTE; MICROCIRCULATION ID VENOUS OCCLUSION METHOD; FLOW; BED AB In this study, we developed and tested a new procedure for measuring microcirculatory blood pressures above heart level in humans. Capillary and postcapillary venule blood pressures were measured directly in 13 human subjects by Use of the servo-nulling micropressure technique adapted for micropuncture of lip capillaries. Pressure waveforms were recorded in 40 separate capillary vessels and 14 separate postcapillary venules over periods ranging from 5 to 64 s. Localization and determination of capillary and postcapillary vessels were ascertained anatomically before pressure measurements. Capillary pressure was 33.2 +/- 1.5 (SE) mmHg in lips of subjects seated upright. Repeated micropunctures of the same vessel gave an average coefficient of variation of 0.072. Postcapillary venule pressure was 18.9 +/- 1.6 mmHg. This procedure produces a direct and reproducible means of measuring microvascular blood pressures in a vascular bed above heart level in humans. C1 NASA,AMES RES CTR,DIV LIFE SCI,MOFFETT FIELD,CA 94035. RP PARAZYNSKI, SE (reprint author), NASA,LYNDON B JOHNSON SPACE CTR,ASTRONAUT OFF,HOUSTON,TX 77058, USA. NR 17 TC 7 Z9 7 U1 0 U2 2 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 FEB PY 1993 VL 74 IS 2 BP 946 EP 950 PG 5 WC Physiology; Sport Sciences SC Physiology; Sport Sciences GA KN704 UT WOS:A1993KN70400064 PM 8458818 ER PT J AU SMITH, SC WILSON, PF SUDKEAW, P MACLAGAN, RGAR MCEWAN, MJ ANICICH, VG HUNTRESS, WT AF SMITH, SC WILSON, PF SUDKEAW, P MACLAGAN, RGAR MCEWAN, MJ ANICICH, VG HUNTRESS, WT TI STATISTICAL MODELING OF CAPTURE, ASSOCIATION, AND EXIT-CHANNEL DYNAMICS IN THE CH3+/CH3CN SYSTEM SO JOURNAL OF CHEMICAL PHYSICS LA English DT Article ID ANGULAR-MOMENTUM CONSERVATION; ION-MOLECULE REACTIONS; RADIATIVE ASSOCIATION; UNIMOLECULAR REACTIONS; RATE COEFFICIENTS; DIPOLE CAPTURE; RATE-CONSTANT; LOW-PRESSURE; GAS-PHASE; DEPENDENCE AB The ion-molecule reaction CH3+ + CH3CN is known to have an association channel leading to CH3CNCH3+ in competition with the exothermic binary channels H2CN+ + C2H4 and C2H5+ + HCN. This reaction has been modeled using a master equation treatment incorporating weak collisions. The parameters required for the Rice-Ramsberger-Kassel-Marcus (RRKM) treatment have been found from an ab initio investigation of the CH3+/CH3CN energy surface. A means of including capture rate coefficients in the RRKM approach is developed, in which only the hindered dipole rotation is coupled with the reaction coordinate at large separations. Existing experimental data from ion cyclotron resonance (ICR) spectroscopy and a selected ion flow tube are fitted by the model in the pressure range 10(-7)-0.3 Torr. The low pressure experimental results are accounted for by weak collisions of the complex with the bath gas (when M = He, [DELTAE(down)] and [DELTAR(down)] approximately - 100 cm-1) corresponding to a collision efficiency beta = 0.05 for M = He and 0.14 for M = CH3CN. Unimolecular rate coefficients for the (CH3CNCH3+)* complex are calculated for all product channels at a range of temperatures from 300 to 600 K. The rate coefficient for radiative stabilization was found to be 225 s-1 at the conditions of the ICR experiment. The average lifetime of the complex was calculated to vary between 29 mus at 600 K to 0.47 ms at 300 K and the termolecular association rates from 3.4 X 10(-24)-9.8 X 10(-23) cm6 s-1 (M = He) and from 6.7 X 10(-23)-2.2 X 10(-21) cm6 s-1 (M = CH3CN) over the temperature range 600-300 K. C1 UNIV CANTERBURY,DEPT CHEM,CHRISTCHURCH 1,NEW ZEALAND. JET PROP LAB,PASADENA,CA 91109. RI Smith, Sean/H-5003-2015 OI Smith, Sean/0000-0002-5679-8205 NR 52 TC 22 Z9 22 U1 0 U2 2 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0021-9606 J9 J CHEM PHYS JI J. Chem. Phys. PD FEB 1 PY 1993 VL 98 IS 3 BP 1944 EP 1956 DI 10.1063/1.464228 PG 13 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA KK858 UT WOS:A1993KK85800019 ER PT J AU RAMACHANDRAN, N DOWNEY, JP CURRERI, PA JONES, JC AF RAMACHANDRAN, N DOWNEY, JP CURRERI, PA JONES, JC TI NUMERICAL MODELING OF CRYSTAL-GROWTH ON A CENTRIFUGE FOR UNSTABLE NATURAL-CONVECTION CONFIGURATIONS SO JOURNAL OF CRYSTAL GROWTH LA English DT Article ID MELT AB The fluid mechanics associated with crystal growth processes on a centrifuge is investigated. The investigation is pursued in two distinct parts. The first part consists of a scaling analysis and a two-dimensional model of fluid flow on a centrifuge. The model is proposed and calculations are undertaken to understand the fundamental transport processes within a crystal growth cell. The second part of the investigation consists of a three-dimensional model of fluid flow on a centrifuge. Results from three-dimensional calculations of actual centrifuge based crystal growth systems are presented for two typical thermal configurations of the crystal growth cell: (1) top heated and (2) bottom heated with respect to the centrifugal acceleration, respectively. The calculations reveal the existence of flow bifurcations in certain configurations, but not in all instances. The numerical simulations also show that the centrifugal force is the dominant stabilizing force on fluid convection in the top heated Configuration 1. For this crystal growth configuration, a substantial reduction in the convection intensity within the melt can be attained by centrifuge operations and close to steady diffusion-limited thermal conditions can be achieved over a narrow range of the imposed macrogravity level. No significant impact of gravity gradients is found in the calculations. Simulations of the bottom heated Configuration 2 show that the Coriolis force has a stabilizing influence on fluid motion by delaying the onset of unsteady convection. Detailed flow and thermal field characteristics are presented for a sample of cases that are simulated. C1 NASA,GEORGE C MARSHALL SPACE FLIGHT CTR,HUNTSVILLE,AL 35812. WYLE LABS,HUNTSVILLE,AL 35807. RP RAMACHANDRAN, N (reprint author), UNIV SPACE RES ASSOC,HUNTSVILLE,AL 35806, USA. NR 15 TC 3 Z9 3 U1 0 U2 2 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 FEB PY 1993 VL 126 IS 4 BP 655 EP 674 DI 10.1016/0022-0248(93)90817-G PG 20 WC Crystallography; Materials Science, Multidisciplinary; Physics, Applied SC Crystallography; Materials Science; Physics GA KL957 UT WOS:A1993KL95700018 ER PT J AU KAISER, MK PHATAK, AV AF KAISER, MK PHATAK, AV TI THINGS THAT GO BUMP IN THE LIGHT - ON THE OPTICAL SPECIFICATION OF CONTACT SEVERITY SO JOURNAL OF EXPERIMENTAL PSYCHOLOGY-HUMAN PERCEPTION AND PERFORMANCE LA English DT Article ID TIME AB Psychologists are intrigued with the idea that optical variables can specify not only the time until an object impacts an observer but also the severity of the impact. However, the mapping between the optical variables (tau and tau) and the kinematic variables (velocity, acceleration) has been misstated, erroneously implying that there exist critical values of the optical variables used for locomotion and control. In this commentary, the mathematical relationship between the optical and kinematic variables is reexamined and the erroneous assumptions that have led to the proposal of critical values are shown. Also examined are the empirical data on deceleration to approach (particularly from active control paradigms) to assess whether the proposed optical variables are likely candidates for control strategies. Finally, problems associated with numerical approximations to dynamic systems, particularly when analytic solutions exist, are discussed. C1 ANALYT MECH ASSOCIATES,SUNNYVALE,CA. RP KAISER, MK (reprint author), NASA,AMES RES CTR,MAIL STOP 262-3,MOFFETT FIELD,CA 94035, USA. NR 6 TC 26 Z9 28 U1 0 U2 0 PU AMER PSYCHOLOGICAL ASSOC PI WASHINGTON PA 750 FIRST ST NE, WASHINGTON, DC 20002-4242 SN 0096-1523 J9 J EXP PSYCHOL HUMAN JI J. Exp. Psychol.-Hum. Percept. Perform. PD FEB PY 1993 VL 19 IS 1 BP 194 EP 202 DI 10.1037//0096-1523.19.1.194 PG 9 WC Psychology; Psychology, Experimental SC Psychology GA KJ765 UT WOS:A1993KJ76500014 PM 8440985 ER PT J AU MOSER, RD ROGERS, MM AF MOSER, RD ROGERS, MM TI THE 3-DIMENSIONAL EVOLUTION OF A PLANE MIXING LAYER - PAIRING AND TRANSITION TO TURBULENCE SO JOURNAL OF FLUID MECHANICS LA English DT Article ID FREE SHEAR-LAYER; DETERMINISTIC MODELS; STREAMWISE VORTICES; INSTABILITY; FLOW; DENSITY; ORIGIN; MOTION AB The evolution of three-dimensional temporally evolving plane mixing layers through as many as three pairings has been simulated numerically. All simulations were begun from a few low-wavenumber disturbances, usually derived from linear stability theory, in addition to the mean velocity. Three-dimensional perturbations were used with amplitudes ranging from infinitesimal to large enough to trigger a rapid transition to turbulence. Pairing is found to inhibit the growth of infinitesimal three-dimensional disturbances, and to trigger the transition to turbulence in highly three-dimensional flows. The mechanisms responsible for the growth of three-dimensionality and onset of transition to turbulence are described. The transition to turbulence is accompanied by the formation of thin sheets of spanwise vorticity, which undergo secondary rollups. The post-transitional simulated flow fields exhibit many properties characteristic of turbulent flows. RP MOSER, RD (reprint author), NASA, AMES RES CTR, MOFFETT FIELD, CA 94035 USA. NR 42 TC 186 Z9 192 U1 1 U2 12 PU CAMBRIDGE UNIV PRESS PI NEW YORK PA 32 AVENUE OF THE AMERICAS, NEW YORK, NY 10013-2473 USA SN 0022-1120 EI 1469-7645 J9 J FLUID MECH JI J. Fluid Mech. PD FEB PY 1993 VL 247 BP 275 EP 320 DI 10.1017/S0022112093000473 PG 46 WC Mechanics; Physics, Fluids & Plasmas SC Mechanics; Physics GA KR533 UT WOS:A1993KR53300013 ER PT J AU ROGERS, MM MOSER, RD AF ROGERS, MM MOSER, RD TI SPANWISE SCALE SELECTION IN PLANE MIXING LAYERS SO JOURNAL OF FLUID MECHANICS LA English DT Article ID FREE-SHEAR-LAYER; STREAMWISE VORTICES; 3-DIMENSIONAL INSTABILITY; DETERMINISTIC MODELS; TURBULENT-FLOW; EVOLUTION; TRANSITION; ORIGIN; MOTION AB Direct numerical simulations of temporally evolving plane mixing layers undergoing as many as three pairings have been examined for evidence of spanwise scale change. All simulations were begun from a few low-wavenumber disturbances. usually derived from linear stability theory, in addition to the mean velocity. The amplitude of the initial three-dimensional disturbances varied from infinitesimal to large enough to trigger a rapid transition to turbulence. The time required for a change of characteristic spanwise scale with infinitesimal three-dimensional disturbances was found to be very long, requiring three or more pairings to complete a doubling of the spanwise scale. Stronger three-dimensionality can produce more rapid scale changes, but it is also likely to trigger transition to turbulence. No evidence was found for a change from an organized array of rib vortices at one spanwise scale to a similar array at a larger spanwise scale. RP ROGERS, MM (reprint author), NASA, AMES RES CTR, MOFFETT FIELD, CA 94035 USA. NR 22 TC 33 Z9 33 U1 0 U2 2 PU CAMBRIDGE UNIV PRESS PI NEW YORK PA 32 AVENUE OF THE AMERICAS, NEW YORK, NY 10013-2473 USA SN 0022-1120 EI 1469-7645 J9 J FLUID MECH JI J. Fluid Mech. PD FEB PY 1993 VL 247 BP 321 EP 337 DI 10.1017/S0022112093000485 PG 17 WC Mechanics; Physics, Fluids & Plasmas SC Mechanics; Physics GA KR533 UT WOS:A1993KR53300014 ER PT J AU ROTTMAN, JW STANSBY, PK AF ROTTMAN, JW STANSBY, PK TI ON THE DELTA-EQUATIONS FOR VORTEX SHEET EVOLUTION SO JOURNAL OF FLUID MECHANICS LA English DT Article ID KELVIN-HELMHOLTZ INSTABILITY; ROLL-UP; SINGULARITY AB We use a set of equations, sometimes referred to as the 'delta-equations', to approximate the two-dimensional inviscid motion of an initially circular vortex sheet released from rest in a cross-flow. We present numerical solutions of these equations for the case with delta2 = 0 (for which the equations are exact) and for delta2 > 0. For small values of the smoothing parameter delta a spectral filter must be used to eliminate spurious instabilities due to round-off error. Two singularities appear simultaneously in the vortex sheet when delta2 = 0 at a critical time t(c). After t(c) the solutions do not converge as the computational mesh is refined. With delta2 > 0, converged solutions were found for all values of delta2 when t < t(c), and for all but the two smallest values of delta2 used when t > t(c). Our results show that when delta2 > 0 the vortex sheet deforms into two doubly branched spirals some time after t(c). The limiting solution as delta --> 0 clearly exists and equals the delta = 0 solution when t < t(c). For t > t(c), the limiting solution appears to exist if only the converged solutions are used, but it is unclear what relation this limiting solution has to any delta2 = 0 solution for these times. C1 UNIV MANCHESTER, DEPT ENGN, MANCHESTER M13 9PL, LANCS, ENGLAND. RP NASA, GODDARD SPACE FLIGHT CTR, UNIV SPACE RES ASSOC, GREENBELT, MD 20771 USA. NR 20 TC 10 Z9 10 U1 0 U2 0 PU CAMBRIDGE UNIV PRESS PI NEW YORK PA 32 AVENUE OF THE AMERICAS, NEW YORK, NY 10013-2473 USA SN 0022-1120 EI 1469-7645 J9 J FLUID MECH JI J. Fluid Mech. PD FEB PY 1993 VL 247 BP 527 EP 549 DI 10.1017/S0022112093000552 PG 23 WC Mechanics; Physics, Fluids & Plasmas SC Mechanics; Physics GA KR533 UT WOS:A1993KR53300021 ER PT J AU PERKO, JS BURLAGA, LF AF PERKO, JS BURLAGA, LF TI SOLAR-CYCLE MODULATION OF GALACTIC COSMIC-RAYS AT HIGH HELIOGRAPHIC LATITUDES - A ONE-DIMENSIONAL SIMULATION SO JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS LA English DT Article ID HELIOSPHERIC CURRENT SHEET; OUTER HELIOSPHERE; RADIAL GRADIENTS; WIND; DEPENDENCE; INTENSITY; AU AB Previous studies have established that large merged interaction regions (MIRs) in the outer heliosphere are the main cause of the 11-year modulation cycle of galactic cosmic rays in the ecliptic. Those simulations were successful despite their use of a constant convection speed. In this study, we show that a large rise in solar wind speed, seen at higher heliographic latitudes during 1985-1987, combined with MIRs, can generate the difference between the Voyager 1 and Voyager 2 count rates in this period. Also, the difference between the starting times of the new cycle at both spacecraft is directly attributable to the difference between the pattern of MIRs measured at the two spacecraft. In addition, the Voyager 2 simulation exhibits the correct behavior of the 11-year cycle in the cosmic ray radial gradients between points in the outer heliosphere. C1 NASA,GODDARD SPACE FLIGHT CTR,EXTRATERR PHYS LAB,CODE 692,GREENBELT,MD 20771. RP PERKO, JS (reprint author), UNIV DELAWARE,BARTOL RES INST,NEWARK,DE 19716, USA. NR 35 TC 5 Z9 5 U1 0 U2 1 PU AMER GEOPHYSICAL UNION PI WASHINGTON PA 2000 FLORIDA AVE NW, WASHINGTON, DC 20009 SN 0148-0227 J9 J GEOPHYS RES JI J. Geophys. Res-Space Phys. PD FEB 1 PY 1993 VL 98 IS A2 BP 1235 EP 1241 DI 10.1029/92JA02365 PG 7 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA KK720 UT WOS:A1993KK72000001 ER PT J AU MCDONALD, FB LAL, N MCGUIRE, RE AF MCDONALD, FB LAL, N MCGUIRE, RE TI ROLE OF DRIFTS AND GLOBAL MERGED INTERACTION REGIONS IN THE LONG-TERM MODULATION OF COSMIC-RAYS SO JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS LA English DT Article ID INFERABLE ELECTROMAGNETIC STATE; HELIOSPHERIC MAGNETIC-FIELD; SOLAR MODULATION; CURRENT SHEET; SECTOR STRUCTURE; TRANSPORT; GRADIENT; INTENSITY AB It is shown that the long-term modulation of 0.2- to 3-GV galactic and anomalous cosmic rays over the 22-year heliomagnetic cycle is principally a combination of two solar related processes, the cumulative effect of long-lived global merged interaction regions (GMIRs) and large-scale particle gradient and curvature drifts 'in the interplanetary magnetic field. This paradigm for cosmic ray modulation is based on the observed changes in cosmic ray intensity from solar minimum to solar maximum over successive solar cycles (21 and 22) using data from 1 AU and from the outer heliosphere. For cycle 21 (when positive ions flow in over the solar pole and out along the heliospheric neutral current sheet; qA > 0), the 1977-1980 modulation is dominated by GMIRs. While drifts may play a role in particle transport in the heliosphere at this time, the changing inclination of the heliospheric neutral sheet has a negligible effect on the intensity of cosmic ray nuclei. In cycle 22 when this flow pattern is reversed, it is shown that drifts are an important but not dominant factor for galactic cosmic ray modulation with the current sheet related drift effects decreasing with increasing rigidity R and heliocentric distance r. Anomalous cosmic rays are much more sensitive to changes in the current sheet inclination. The observed changes in the galactic cosmic ray intensity over the 1987-1988 period due to the increasing inclination of the current sheet, a, are a factor of 3-5 smaller than predicted by the time-dependent model of Potgieter and Le Roux (1992). The latitude variation at Voyager 1 (heliolatitude 32-degrees) of the dependence of galactic cosmic ray intensity on alpha is consistent with theoretical expectations. The strong role of GMIRs and their episodic nature requires a long lifetime (1.5-1.8 years) and a magnetic structure that effectively extends over the solar poles. Such a long GMIR lifetime implies a modulation boundary of the order of approximately 175 AU. C1 NASA,GODDARD SPACE FLIGHT CTR,HIGH ENERGY ASTROPHYS LAB,CODE 664,GREENBELT,MD 20771. NASA,GODDARD SPACE FLIGHT CTR,NATL SPACE SCI DATA CTR,CODE 933,GREENBELT,MD 20771. RP MCDONALD, FB (reprint author), UNIV MARYLAND,INST PHYS SCI & TECHNOL,COLL PK,MD 20742, USA. NR 46 TC 58 Z9 58 U1 0 U2 0 PU AMER GEOPHYSICAL UNION PI WASHINGTON PA 2000 FLORIDA AVE NW, WASHINGTON, DC 20009 SN 0148-0227 J9 J GEOPHYS RES JI J. Geophys. Res-Space Phys. PD FEB 1 PY 1993 VL 98 IS A2 BP 1243 EP 1256 DI 10.1029/92JA02205 PG 14 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA KK720 UT WOS:A1993KK72000002 ER PT J AU WILSON, RM AF WILSON, RM TI A PREDICTION FOR THE ONSET OF CYCLE-23 SO JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS LA English DT Article ID SOLAR-CYCLE; BIMODALITY; DURATION; MAXIMUM AB The present sunspot cycle (number 22) is now in decline, having had its onset in September 1986, its primary maximum in July 1989, and a secondary maximum (of lower value) in 1991. Dependent upon whether cycle 22 is a short- or long-period cycle, onset for cycle 23 will occur, respectively. either prior or subsequent to about July 1997. A relation is described, involving the slopes (i.e., the average rates of change in smoothed sunspot number values) as seen during the ascending and descending portions of the sunspot cycle, which appears to clarify, at least for cycle 22, the ambiguity of cycle length. In particular, the relation strongly suggests that cycle 22 is a short-period cycle and that onset for cycle 23 will come early rather than late, with the most probable date for cycle 23 onset being May-November 1996. RP WILSON, RM (reprint author), NASA,GEORGE C MARSHALL SPACE FLIGHT CTR,SPACE SCI LAB,E552,HUNTSVILLE,AL 35812, USA. NR 18 TC 9 Z9 9 U1 0 U2 0 PU AMER GEOPHYSICAL UNION PI WASHINGTON PA 2000 FLORIDA AVE NW, WASHINGTON, DC 20009 SN 0148-0227 J9 J GEOPHYS RES JI J. Geophys. Res-Space Phys. PD FEB 1 PY 1993 VL 98 IS A2 BP 1333 EP 1337 DI 10.1029/92JA02557 PG 5 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA KK720 UT WOS:A1993KK72000009 ER PT J AU TAGUCHI, S SUGIURA, M WINNINGHAM, JD SLAVIN, JA AF TAGUCHI, S SUGIURA, M WINNINGHAM, JD SLAVIN, JA TI CHARACTERIZATION OF THE IMF BY-DEPENDENT FIELD-ALIGNED CURRENTS IN THE CLEFT REGION BASED ON DE-2 OBSERVATIONS SO JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS LA English DT Article ID INTERPLANETARY MAGNETIC-FIELD; MAGNETOSPHERIC BOUNDARY-LAYER; DAYSIDE POLAR-REGION; BIRKELAND CURRENTS; HIGH-LATITUDE; ELECTRIC-FIELDS; CURRENT SYSTEM; NORTHWARD IMF; PLASMA-FLOW; SOLAR-WIND AB The interplanetary magnetic field (IMF) B(y)-dependent distribution of field-aligned currents in the cleft region is studied, using the magnetic field and plasma data from 47 passes of Dynamics Explorer (DE) 2. These orbits were chosen on the conditions that cusp/cleft particles are detected and that at the same time the IMF B(y) and B(z) components satisfy the criteria \B(y)\ greater-than-or-equal-to 5 nT and \B(z)\ less-than-or-equal-to 5 nT during the satellite's crossing of the relevant field-aligned current region. When B(y) is positive (negative) in addition to satisfying these conditions, there is a strong eastward (westward) magnetic perturbation caused by a pair of field-aligned current sheets, consisting of an equatorward sheet with downward (upward) current and a poleward sheet having upward (downward) current. These B(y)-dependent field-aligned currents in the equatorward and the poleward sheets are referred to as the low-latitude cleft current (LCC) and the high-latitude cleft current (HCC), respectively. The cusp/cleft electron precipitation region and the LCC region overlap with each other to a varying degree irrespective of the sign of B(y). For positive (negative) B(y), LCC has the same direction as the morning (afternoon) region 1 current or the afternoon (morning) region 2 current. Thus an interpretation has been given in the past that the LCC region is an extension of the region 1 or region 2 current system. However, in this paper we present an alternative view that the LCC region is not an extension of the region 1 or region 2 current system and that a pair of LCC and HCC constitutes the cleft field-aligned current regime. The proposed pair of cleft field-aligned currents is explained with a qualitative model in which this pair of currents is generated on the open field lines that have just been reconnected on the dayside magnetopause. The model assumes a quasi-steady reconnection operating within certain longitudinal width extending to both sides of the stagnation point on the dayside magnetopause. The reconnected flux tubes move under the influences of the field tension and the magnetosheath flow. When the magnetosheath B(y) is positive, the northern hemisphere field lines reconnected on the eastward side of the stagnation point are pulled toward higher latitudes, and the field lines reconnected on the westward side of the stagnation point are pulled along the dawnside magnetopause flank. The electric fields associated with these motions are present immediately inside the magnetopause (rotational discontinuity). This is the source region of LCC and HCC. The electric fields are transmitted along the field lines to the ionosphere, creating a poleward electric field and a pair of field-aligned currents when B(y) is positive; the pair of field-aligned currents consists of a downward current at lower latitudes (LCC) and an upward current at higher latitudes (HCC). In the B(y) negative case, the model explains the reversal of the field-aligned current direction in the LCC and HCC regions. C1 TOKAI UNIV,INST RES & DEV,TOKYO 151,JAPAN. SW RES INST,SAN ANTONIO,TX 78228. NASA,GODDARD SPACE FLIGHT CTR,CODE 696,GREENBELT,MD 20771. RP TAGUCHI, S (reprint author), KYOTO UNIV,FAC SCI,DEPT GEOPHYS,KYOTO 606,JAPAN. RI Slavin, James/H-3170-2012 OI Slavin, James/0000-0002-9206-724X NR 49 TC 86 Z9 88 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 JI J. Geophys. Res-Space Phys. PD FEB 1 PY 1993 VL 98 IS A2 BP 1393 EP 1407 DI 10.1029/92JA01014 PG 15 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA KK720 UT WOS:A1993KK72000015 ER PT J AU TSURUTANI, BT GONZALEZ, WD AF TSURUTANI, BT GONZALEZ, WD TI GEOMAGNETIC-ACTIVITY ASSOCIATED WITH EARTH PASSAGE OF INTERPLANETARY SHOCK DISTURBANCES AND CORONAL MASS EJECTIONS - COMMENT SO JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS LA English DT Note ID MAGNETOPAUSE BOUNDARY-LAYER; MAGNETIC STORMS 1978-1979; HIGH TIME RESOLUTION; DIFFUSION-PROCESSES; PARAMETERS; DST C1 INST PESQUISAS ESPACIAIS,S JOSE CAMPO,SP,BRAZIL. RP TSURUTANI, BT (reprint author), JET PROP LAB,MAIL STOP 169-506,4800 OAK GROVE DR,PASADENA,CA 91109, USA. NR 29 TC 2 Z9 2 U1 0 U2 1 PU AMER GEOPHYSICAL UNION PI WASHINGTON PA 2000 FLORIDA AVE NW, WASHINGTON, DC 20009 SN 0148-0227 J9 J GEOPHYS RES JI J. Geophys. Res-Space Phys. PD FEB 1 PY 1993 VL 98 IS A2 BP 1507 EP 1508 DI 10.1029/92JA02008 PG 2 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA KK720 UT WOS:A1993KK72000024 ER PT J AU HEPPNER, JP LIEBRECHT, MC MAYNARD, NC PFAFF, RF AF HEPPNER, JP LIEBRECHT, MC MAYNARD, NC PFAFF, RF TI HIGH-LATITUDE DISTRIBUTIONS OF PLASMA-WAVES AND SPATIAL IRREGULARITIES FROM DE-2 ALTERNATING-CURRENT ELECTRIC-FIELD OBSERVATIONS SO JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS LA English DT Article ID GRADIENT DRIFT INSTABILITY; ION-CYCLOTRON RESONANCE; F-REGION IRREGULARITIES; TOP SIDE IONOSPHERE; MAGNETIC PULSATIONS; ALFVEN WAVES; INTERCHANGE INSTABILITIES; NONLINEAR EVOLUTION; TOPSIDE IONOSPHERE; SOUNDING ROCKET AB An 18-month data base from the Dynamics Explorer 2 AC electric field spectrometers is used to obtain average high-latitude magnetic local time (MLT) versus invariant latitude (INL) distributions of signal intensities in 12 frequency bands between 4 Hz and 512 kHz. Three distinctly different distributions are obtained, corresponding to (1) Doppler-shifted signals from spatial structures in the electric field (i.e., irregularities) and Alfven waves between 4 and 512 Hz, (2) ELF waves between 256 Hz and 4.1 kHz, and (3) VLF waves between 4.1 and 64 kHz with extensions into the 128-512 kHz band. The ELF and VLF distributions closely resemble previously published results based on more limited sampling. Comparable distributions for the seven channels between 4 and 512 Hz, showing a prominent zone of maximum intensities at 72.5-degrees-80-degrees INL between 0500 and 1300 MLT, have not previously been reported. The power law frequency dependence of average power spectral densities (PSDs) between 4 and 512 Hz is also mapped in MLT-INL coordinates. At all locations, two power law indices (slopes) are required to closely fit the PSDs with an inverted knee joining the two slopes in the 32-64 Hz band. This knee band corresponds to the range of O+ cyclotron frequencies encountered, and it lends credence to Gurnett et al.'s (1984) contention that Alfven waves are an essential ingredient in explaining the low-frequency in situ satellite signals which were previously attributed to polarization fields accompanying spatial irregularities in plasma densities. However, other aspects of the 4-512 Hz observations, including seasonal variations, favor the earlier spatial irregularity interpretation. As discussed, the difficulties encountered in seeking interpretations exclusively in terms of either spatial irregularities or Alfven waves can be resolved with a synthesis approach requiring both types of signals. It is proposed that the averaged intensities and corresponding spectral characteristics in the 4-512 Hz band represent the consequence of intermittently superimposing shear Alfven waves on a spatially irregular medium. There are then three principal contributions: (1) an omnipresent 4-512 Hz signal from Doppler-shifted responses to 2000-15 m spatial irregularities having an average power law spectral index near -1.9, (2) intermittent signals from locally generated shear Alfven waves having maximum power at frequencies of <4 Hz and average power law spectral indices of less-than-or-equal-to (-2.8) extending only to f(c)(O+), and (3) spatial irregularity modulations of shear Alfven waves originating both locally and in the distant magnetosphere. C1 NASA,GODDARD SPACE FLIGHT CTR,EXTRATERR PHYS LAB,GREENBELT,MD 20771. RI Pfaff, Robert/F-5703-2012 OI Pfaff, Robert/0000-0002-4881-9715 NR 98 TC 38 Z9 38 U1 0 U2 1 PU AMER GEOPHYSICAL UNION PI WASHINGTON PA 2000 FLORIDA AVE NW, WASHINGTON, DC 20009 SN 0148-0227 J9 J GEOPHYS RES JI J. Geophys. Res-Space Phys. PD FEB 1 PY 1993 VL 98 IS A2 BP 1629 EP 1652 DI 10.1029/92JA01836 PG 24 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA KK720 UT WOS:A1993KK72000036 ER PT J AU MENART, JA LEE, HS KIM, TK AF MENART, JA LEE, HS KIM, TK TI DISCRETE ORDINATES SOLUTIONS OF NONGRAY RADIATIVE-TRANSFER WITH DIFFUSELY REFLECTING WALLS SO JOURNAL OF HEAT TRANSFER-TRANSACTIONS OF THE ASME LA English DT Article DE RADIATION ID MODEL CALCULATIONS; BAND; GASES; H2O AB Nongray gas radiation in a plane parallel slab bounded by gray, diffusely reflecting walls is studied using the discrete ordinates method. The spectral equation of transfer is averaged over a narrow wavenumber interval preserving the spectral correlation effect. The governing equations are derived by considering the history of multiple reflections between two reflecting walls. A closure approximation is applied so that only a finite number of reflections have to be explicitly included. The closure solutions express the physics of the problem to a very high degree and show relatively little error. Numerical solutions are obtained by applying a statistical narrow-band model for gas properties and a discrete ordinates code. The net radiative wall heat fluxes and the radiative source distributions are obtained for different temperature profiles. A zeroth-degree formulation, where no wall reflection is handled explicitly, is sufficient to predict the radiative transfer accurately for most cases considered, when compared with increasingly accurate solutions based on explicitly tracing a larger number of wall reflections without any closure approximation applied. C1 CHUNG ANG UNIV,DEPT MECH ENGN,SEOUL,SOUTH KOREA. NASA,LEWIS RES CTR,CLEVELAND,OH 44135. RP MENART, JA (reprint author), UNIV MINNESOTA,DEPT MECH ENGN,MINNEAPOLIS,MN 55455, USA. NR 19 TC 20 Z9 22 U1 1 U2 3 PU ASME-AMER SOC MECHANICAL ENG PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 SN 0022-1481 J9 J HEAT TRANS-T ASME JI J. Heat Transf.-Trans. ASME PD FEB PY 1993 VL 115 IS 1 BP 184 EP 193 DI 10.1115/1.2910647 PG 10 WC Thermodynamics; Engineering, Mechanical SC Thermodynamics; Engineering GA KP910 UT WOS:A1993KP91000025 ER PT J AU SIEGEL, R SPUCKLER, CM AF SIEGEL, R SPUCKLER, CM TI REFRACTIVE-INDEX EFFECTS ON RADIATION IN AN ABSORBING, EMITTING, AND SCATTERING LAMINATED LAYER SO JOURNAL OF HEAT TRANSFER-TRANSACTIONS OF THE ASME LA English DT Article DE RADIATION ID FLUX AB A simple set of equations is derived for predicting temperature distributions and radiative energy flow in a two-region semitransparent laminated layer in the limit of zero heat conduction. The composite is heated on its two sides by unequal amounts of incident radiation. The two layers of the composite have different refractive indices, and each material absorbs, emits, and isotropically scatters radiation. The interfaces are diffuse, and all interface reflections are included. To illustrate the thermal behavior that is readily calculated from the equations, typical results are given for various optical thicknesses and refractive indices of the layers. Internal reflections have a substantial effect on the temperature distribution and radiative heatflow. RP SIEGEL, R (reprint author), NASA, LEWIS RES CTR, CLEVELAND, OH 44135 USA. NR 14 TC 23 Z9 24 U1 1 U2 5 PU ASME PI NEW YORK PA TWO PARK AVE, NEW YORK, NY 10016-5990 USA SN 0022-1481 EI 1528-8943 J9 J HEAT TRANS-T ASME JI J. Heat Transf.-Trans. ASME PD FEB PY 1993 VL 115 IS 1 BP 194 EP 200 DI 10.1115/1.2910648 PG 7 WC Thermodynamics; Engineering, Mechanical SC Thermodynamics; Engineering GA KP910 UT WOS:A1993KP91000026 ER PT J AU SIEGEL, R AF SIEGEL, R TI RELATIONS FOR LOCAL RADIATIVE HEAT-TRANSFER BETWEEN RECTANGULAR BOUNDARIES OF AN ABSORBING-EMITTING MEDIUM SO JOURNAL OF HEAT TRANSFER-TRANSACTIONS OF THE ASME LA English DT Note DE FURNACES AND COMBUSTORS; RADIATION RP SIEGEL, R (reprint author), NASA,LEWIS RES CTR,CLEVELAND,OH 44135, USA. NR 6 TC 3 Z9 3 U1 0 U2 0 PU ASME-AMER SOC MECHANICAL ENG PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 SN 0022-1481 J9 J HEAT TRANS-T ASME JI J. Heat Transf.-Trans. ASME PD FEB PY 1993 VL 115 IS 1 BP 272 EP 276 DI 10.1115/1.2910663 PG 5 WC Thermodynamics; Engineering, Mechanical SC Thermodynamics; Engineering GA KP910 UT WOS:A1993KP91000039 ER PT J AU VENKATARAMAN, ST GULATI, S AF VENKATARAMAN, ST GULATI, S TI TERMINAL SLIDER CONTROL OF ROBOT SYSTEMS SO JOURNAL OF INTELLIGENT & ROBOTIC SYSTEMS LA English DT Article DE ROBUST CONTROL; SLIDING MODES; ROBOTICS; TERMINAL ATTRACTORS ID MECHANICAL-PROPERTIES; AERIAL MOVEMENT; HUMAN-BODY; SIMULATION; DYNAMICS AB Many robotic systems would, in the future, be required to operate in environments that are highly unstructured (with varying dynamical properties) and active (possessing means of self-actuation). Although a significant volume of results exist in model-based, robust and adaptive control literature, many issues pertinent to the stabilization of contact interactions with unpredictable environments remain unresolved, especially in dealing with large magnitude and high frequency parametric uncertainties. The primary intent of this paper is nonlinear control synthesis for robotic operations in unstructured environments. We introduce the notion of time constrained terminal convergence for controlled systems, and propose an approach to nonlinear control synthesis based upon a new class of sliding modes, denoted terminal sliders. Terminal controllers that enforce finite convergence to equilibrium are synthesized for an example nonlinear system (with and without parametric uncertainties). Improved performance is demonstrated through the elimination of high frequency control switching, employed previously for robustness to parametric uncertainties [2]. The dependence of terminal slider stability upon the rate of change of uncertainties over the sliding surface, rather than the magnitude of the uncertainty itself, results in improved control robustness. Improved reliability is demonstrated through the elimination of interpolation regions [2]. Finally, improved (guaranteed) precision is argued for through an analysis of steady state behavior. RP VENKATARAMAN, ST (reprint author), JET PROP LAB,MS 198-219,4800 OAK GROVE DR,PASADENA,CA 91109, USA. NR 30 TC 3 Z9 3 U1 0 U2 0 PU KLUWER ACADEMIC PUBL PI DORDRECHT PA SPUIBOULEVARD 50, PO BOX 17, 3300 AA DORDRECHT, NETHERLANDS SN 0921-0296 J9 J INTELL ROBOT SYST JI J. Intell. Robot. Syst. PD FEB PY 1993 VL 7 IS 1 BP 31 EP 55 DI 10.1007/BF01258211 PG 25 WC Computer Science, Artificial Intelligence; Robotics SC Computer Science; Robotics GA KJ271 UT WOS:A1993KJ27100003 ER PT J AU HEYART, M PERRIN, A FLAUD, JM CAMYPEYRET, C RINSLAND, CP SMITH, MAH DEVI, VM AF HEYART, M PERRIN, A FLAUD, JM CAMYPEYRET, C RINSLAND, CP SMITH, MAH DEVI, VM TI THE HYBRID-TYPE BANDS NU-1 AND NU-3 OF O-16 O-16 O-17 LINE POSITIONS AND INTENSITIES SO JOURNAL OF MOLECULAR SPECTROSCOPY LA English DT Article ID O-16O-16O-18 C1 NASA,LANGLEY RES CTR,DIV ATMOSPHER SCI,HAMPTON,VA 23681. COLL WILLIAM & MARY,DEPT PHYS,WILLIAMSBURG,VA 23185. RP HEYART, M (reprint author), UNIV PARIS 06,CNRS,PHYS MOLEC & APPLICAT LAB,TOUR 13,BTE 76,4 PL JUSSIEU,F-75252 PARIS 05,FRANCE. NR 6 TC 14 Z9 15 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 0022-2852 J9 J MOL SPECTROSC JI J. Mol. Spectrosc. PD FEB PY 1993 VL 157 IS 2 BP 524 EP 531 DI 10.1006/jmsp.1993.1041 PG 8 WC Physics, Atomic, Molecular & Chemical; Spectroscopy SC Physics; Spectroscopy GA KK657 UT WOS:A1993KK65700018 ER PT J AU HAMABATA, H AF HAMABATA, H TI PARAMETRIC-INSTABILITIES OF FINITE-AMPLITUDE, CIRCULARLY-POLARIZED ALFVEN WAVES IN AN ANISOTROPIC-PLASMA SO JOURNAL OF PLASMA PHYSICS LA English DT Article ID MODULATIONAL INSTABILITY; SOLAR-WIND AB A class of parametric instabilities of finite-amplitude, circularly polarized Alfven waves in a plasma with pressure anisotropy is studied by application of the CGL equations. A linear perturbation analysis is used to find the dispersion relation governing the instabilities, which is a fifth-order polynomial and is solved numerically. A large-amplitude, circularly polarized wave is unstable with respect to decay into three waves: one sound-like wave and two side-band Alfven-like waves. It is found that, in addition to the decay instability, two new instabilities that are absent in the framework of the MHD equations can occur, depending on the plasma parameters. RP HAMABATA, H (reprint author), NASA,AMES RES CTR,DIV SPACE SCI,MOFFETT FIELD,CA 94035, USA. NR 19 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 0022-3778 J9 J PLASMA PHYS JI J. Plasma Phys. PD FEB PY 1993 VL 49 BP 29 EP 39 PN 1 PG 11 WC Physics, Fluids & Plasmas SC Physics GA LJ495 UT WOS:A1993LJ49500003 ER PT J AU GOODMAN, ML AF GOODMAN, ML TI DRIVEN, DISSIPATIVE, ENERGY-CONSERVING MAGNETOHYDRODYNAMIC EQUILIBRIA .2. THE SCREW PINCH SO JOURNAL OF PLASMA PHYSICS LA English DT Article ID TRANSPORT; TURBULENCE; PLASMAS; SYSTEMS; TOKAMAK AB A cylindrically symmetric, electrically driven, dissipative, energy-conserving magnetohydrodynamic equilibrium model is considered. The high-magnetic-field Braginskii ion thermal conductivity perpendicular to the local magnetic field and the complete electron resistivity tensor are included in an energy equation and in Ohm's law. The expressions for the resistivity tensor and thermal conductivity depend on number density, temperature, and the poloidal and axial (z-component) magnetic field, which are functions of radius that are obtained as part of the equilibrium solution. The model has plasma-confining solutions, by which is meant solutions characterized by the separation of the plasma into two concentric regions separated by a transition region that is an internal boundary layer. The inner region is the region of confined plasma, and the outer region is the region of unconfined plasma. The inner region has average values of temperature, pressure, and axial and poloidal current densities that are orders of magnitude larger than in the outer region. The temperature, axial current density and pressure gradient vary rapidly by orders of magnitude in the transition region. The number density, thermal conductivity and Dreicer electric field have a global minimum in the transition region, while the Hall resistivity, Alfven speed, normalized charge separation, Debye length, (omegatau)ion and the radial electric field have global maxima in the transition region. As a result of the Hall and electron-pressure-gradient effects, the transition region is an electric dipole layer in which the normalized charge separation is localized and in which the radial electric field can be large. The model has an intrinsic value of beta, about 13.3 %, which must be exceeded in order that a plasma-confining solution exist. The model has an intrinsic length scale that, for plasma-confining solutions, is a measure of the thickness of the boundary-layer transition region. If appropriate boundary conditions are given at R = 0 then the equilibrium is uniquely determined. If appropriate boundary conditions are given at any outer boundary R = a then the equilibrium exhibits a bifurcation into two states, one of which exhibits plasma confinement and carries a larger axial current than the other, which is almost homogeneous and cannot confine a plasma. Exact expressions for the two values of the axial current in the bifurcation are derived. If the boundary conditions are given at R = a then a solution exists if and only if the constant driving electric field exceeds a critical value. An exact expression for this critical electric field is derived. It is conjectured that the bifurcation is associated with an electric-field-driven transition in a real plasma, between states with different rotation rates. energy dissipation rates and confinement properties. Such a transition may serve as a relatively simple example of the L-H mode transition observed in tokamaks. C1 NASA, GODDARD SPACE FLIGHT CTR, PLANETARY MAGNETOSPHERES BRANCH, EXTRATERRESTRIAL PHYS LAB, GREENBELT, MD 20771 USA. RP NASA, GODDARD SPACE FLIGHT CTR, UNIV SPACE RES ASSOC, GREENBELT, MD 20771 USA. NR 17 TC 4 Z9 4 U1 0 U2 1 PU CAMBRIDGE UNIV PRESS PI NEW YORK PA 32 AVENUE OF THE AMERICAS, NEW YORK, NY 10013-2473 USA SN 0022-3778 EI 1469-7807 J9 J PLASMA PHYS JI J. Plasma Phys. PD FEB PY 1993 VL 49 BP 125 EP 159 PN 1 PG 35 WC Physics, Fluids & Plasmas SC Physics GA LJ495 UT WOS:A1993LJ49500011 ER PT J AU WANG, JT LOTTS, CG DAVIS, DD AF WANG, JT LOTTS, CG DAVIS, DD TI ANALYSIS OF BOLT-LOADED ELLIPTIC HOLES IN LAMINATED COMPOSITE JOINTS SO JOURNAL OF REINFORCED PLASTICS AND COMPOSITES LA English DT Article; Proceedings Paper CT 6TH TECHNICAL CONF OF THE AMERICAN SOC FOR COMPOSITES CY OCT 07-09, 1991 CL ALBANY, NY SP AMER SOC COMPOSITES ID STRENGTH; FAILURE AB The feasibility of changing the bolt shape from circular to elliptical in order to increase the joint strength was investigated. An analytical method using a cosine series to represent the bearing stress was derived, and a boundary collocation method was used to determine the unknown coefficients of this cosine series. Stresses at the hole edge predicted by the analytical method agreed very well with finite element solutions. Failure analyses of joints in two different laminates were performed, and each laminate exhibited a different joint failure mode. Results demonstrate that the joint strength of both laminates can be improved substantially by changing the bolt shape to elliptical. The joint that failed in a bearing mode showed a greater strength increase compared to the joint that failed in a shearing mode. RP WANG, JT (reprint author), NASA,LANGLEY RES CTR,HAMPTON,VA 23665, USA. NR 19 TC 15 Z9 15 U1 0 U2 2 PU TECHNOMIC PUBL CO INC PI LANCASTER PA 851 NEW HOLLAND AVE, BOX 3535, LANCASTER, PA 17604 SN 0731-6844 J9 J REINF PLAST COMP JI J. Reinf. Plast. Compos. PD FEB PY 1993 VL 12 IS 2 BP 128 EP 138 DI 10.1177/073168449301200201 PG 11 WC Materials Science, Composites; Polymer Science SC Materials Science; Polymer Science GA KP214 UT WOS:A1993KP21400001 ER PT J AU KERSLAKE, TW IBRAHIM, MB AF KERSLAKE, TW IBRAHIM, MB TI ANALYSIS OF THERMAL-ENERGY STORAGE MATERIAL WITH CHANGE-OF-PHASE VOLUMETRIC EFFECTS SO JOURNAL OF SOLAR ENERGY ENGINEERING-TRANSACTIONS OF THE ASME LA English DT Article ID HEAT AB NASA's Space Station Freedom proposed hybrid power system includes photovoltaic arrays with nickel hydrogen batteries for energy storage and solar dynamic collectors driving Brayton heat engines with change-of-phase thermal energy storage (TES) devices. A TES device is comprised of multiple metallic, annular canisters which contain a eutectic composition LiF-CaF2 phase change material (PCM) that melts at 1040 K. A moderately sophisticated LiF-CaF2 PCM computer model is being developed in two stages considering first one-dimensional and then two-dimensional canister geometries. One-dimensional model results indicate that the void has a marked effect on the phase change process due to PCM displacement and dynamic void heat transfer resistance. Equally influential are the effects of different boundary conditions and liquid PCM free convection. For the second stage, successful numerical techniques used in the one-dimensional phase change model are extended to a two-dimensional (r,z) PCM containment canister model. A prototypical PCM containment canister is analyzed and the results are discussed. C1 CLEVELAND STATE UNIV,DEPT MECH ENGN,CLEVELAND,OH 44115. RP KERSLAKE, TW (reprint author), NASA,LEWIS RES CTR,CLEVELAND,OH 44135, USA. NR 29 TC 25 Z9 27 U1 0 U2 4 PU ASME-AMER SOC MECHANICAL ENG PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 SN 0199-6231 J9 J SOL ENERG-T ASME JI J. Sol. Energy Eng. Trans.-ASME PD FEB PY 1993 VL 115 IS 1 BP 22 EP 31 DI 10.1115/1.2930019 PG 10 WC Energy & Fuels; Engineering, Mechanical SC Energy & Fuels; Engineering GA KP697 UT WOS:A1993KP69700004 ER PT J AU LUND, KO BAKER, KW AF LUND, KO BAKER, KW TI MINIMUM-WEIGHT ANALYSIS OF ANISOTROPIC PLANE-FIN HEAT-PIPE SPACE RADIATORS SO JOURNAL OF SOLAR ENERGY ENGINEERING-TRANSACTIONS OF THE ASME LA English DT Article ID SOLAR COLLECTOR ABSORBERS; GENERAL THERMAL-ANALYSIS AB Equations are formulated for the two-dimensional, anisotropic conduction of heat in space radiator fins. The transverse temperature field is obtained by the integral method, and the axial field by numerical integration. A shape factor, defined for the heat-pipe interface boundary condition, simplifies the analysis and renders the results applicable to general heat-pipe/conduction-fin designs. The thermal results are summarized in terms of the fin efficiency, a fin length parameter, and a radiation/axial-conductance number. These relations, together with those for mass distribution between fins, heat pipes, and headers are used in formulating a radiator mass/heat-rate criterion function. Minimization of the criterion function results in asymptotic solutions for the optimum radiator geometry and conditions. The effect of physical properties on the optimum design is determined; in particular, performance is found to vary with fin conductivity to the 113 power for large conductivity values. C1 NASA,LEWIS RES CTR,DIV POWER TECHNOL 3013,CLEVELAND,OH 44135. RP LUND, KO (reprint author), UNIV CALIF SAN DIEGO,CTR ENERGY & COMBUST RES 0310,LA JOLLA,CA 92093, USA. NR 17 TC 4 Z9 4 U1 0 U2 1 PU ASME-AMER SOC MECHANICAL ENG PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 SN 0199-6231 J9 J SOL ENERG-T ASME JI J. Sol. Energy Eng. Trans.-ASME PD FEB PY 1993 VL 115 IS 1 BP 37 EP 41 DI 10.1115/1.2930022 PG 5 WC Energy & Fuels; Engineering, Mechanical SC Energy & Fuels; Engineering GA KP697 UT WOS:A1993KP69700006 ER PT J AU SAMSON, D AF SAMSON, D TI KNOWLEDGE-BASED TEST PLANNING - FRAMEWORK FOR A KNOWLEDGE-BASED SYSTEM TO PREPARE A SYSTEM TEST PLAN FROM SYSTEM REQUIREMENTS SO JOURNAL OF SYSTEMS AND SOFTWARE LA English DT Article ID AUTOMATIC TEXT-RETRIEVAL; SOFTWARE AB Early planning for system acceptance testing will result in better prepared and executed tests of a system being delivered. Since system acceptance testing is tightly coupled to system requirements, a test plan can be derived directly from requirements statements. For complex systems with hundreds of requirements, knowledge-based support has the potential to improve the quality and timeliness of a test plan document. This article discusses a framework for such knowledge-based support. First, it describes a taxonomy for classifying requirements an two exercises given to testers to validate the taxonomy and the classification concept. Then, the test-types taxonomy, a rudimentary knowledge base, and matching algorithms are presented. The article gives a complete example of matching requirements statement to an appropriate test type for demonstrating system compliance. An overview is presented of ongoing efforts to construct a robust, knowledge-based product that will implement this framework to automatically prepare a system test plan from requirements. C1 WEBER STATE UNIV,DEPT COMP INFORMAT SYST,OGDEN,UT 84408. JET PROP LAB,PASADENA,CA 91109. NR 18 TC 0 Z9 0 U1 0 U2 1 PU ELSEVIER SCIENCE INC PI NEW YORK PA 655 AVENUE OF THE AMERICAS, NEW YORK, NY 10010 SN 0164-1212 J9 J SYST SOFTWARE JI J. Syst. Softw. PD FEB PY 1993 VL 20 IS 2 BP 115 EP 124 DI 10.1016/0164-1212(93)90003-G PG 10 WC Computer Science, Software Engineering; Computer Science, Theory & Methods SC Computer Science GA KN678 UT WOS:A1993KN67800003 ER PT J AU GINGOLD, H SHE, JM ZORUMSKI, WE AF GINGOLD, H SHE, JM ZORUMSKI, WE TI LOCAL PRINCIPLES OF WAVE-PROPAGATION IN INHOMOGENEOUS-MEDIA SO JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA LA English DT Article AB Four local principles are proven for waves propagating in a layered medium with a variable wave speed. These principles are (1) that inhomogeneities increase the amplitude of waves generated by a source of fixed strength, (2) that inhomogeneities reduce spatial oscillation, or increase the wavelength, (3) that inhomogeneities decrease transmission, or increase reflection, and (4) that transmission increases monotonically with frequency. Definitions of inhomogeneity, local wave function, and local reflection and transmission coefficients are made as a basis for stating these principles. C1 LANGLEY RES CTR,DIV ACOUST,HAMPTON,VA 23665. RP GINGOLD, H (reprint author), W VIRGINIA UNIV,DEPT MATH,MORGANTOWN,WV 26506, USA. NR 11 TC 5 Z9 5 U1 0 U2 0 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0001-4966 J9 J ACOUST SOC AM JI J. Acoust. Soc. Am. PD FEB PY 1993 VL 93 IS 2 BP 599 EP 604 DI 10.1121/1.405478 PG 6 WC Acoustics; Audiology & Speech-Language Pathology SC Acoustics; Audiology & Speech-Language Pathology GA KL820 UT WOS:A1993KL82000001 ER PT J AU ASAKI, TJ MARSTON, PL TRINH, EH AF ASAKI, TJ MARSTON, PL TRINH, EH TI SHAPE OSCILLATIONS OF BUBBLES IN WATER DRIVEN BY MODULATED ULTRASONIC RADIATION PRESSURE - OBSERVATIONS AND DETECTION WITH SCATTERED LASER-LIGHT SO JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA LA English DT Article ID CRITICAL-ANGLE; QUADRUPOLE OSCILLATIONS; INTERFACIAL-TENSION; DROPS AB Steady-state quadrupole shape oscillations of air bubbles trapped in water were excited by amplitude modulation of the acoustic radiation pressure used for levitation. This method of exciting controlled shape oscillations may make possible noncontact dynamical measurements of the rheological properties of bubbles. Bubble sizes ranged from 1.6- to 12-mm diameter corresponding to observed quadrupole mode frequencies of 190 to 17 Hz. Small-amplitude oscillations were detected by interference of scattered laser light. Some larger amplitude oscillations were detected by the unaided eye or with a television camera. The structure of the acoustic field in the levitator needed for the levitation of large bubbles is discussed. In the absence of modulation the levitated bubbles had an oblate shape. C1 JET PROP LAB,PASADENA,CA 91109. RP ASAKI, TJ (reprint author), WASHINGTON STATE UNIV,DEPT PHYS,PULLMAN,WA 99164, USA. NR 36 TC 30 Z9 30 U1 0 U2 8 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0001-4966 J9 J ACOUST SOC AM JI J. Acoust. Soc. Am. PD FEB PY 1993 VL 93 IS 2 BP 706 EP 713 DI 10.1121/1.405434 PG 8 WC Acoustics; Audiology & Speech-Language Pathology SC Acoustics; Audiology & Speech-Language Pathology GA KL820 UT WOS:A1993KL82000011 ER PT J AU KOHAMA, Y DAVIS, SS AF KOHAMA, Y DAVIS, SS TI A NEW PARAMETER FOR PREDICTING CROSS-FLOW INSTABILITY SO JSME INTERNATIONAL JOURNAL SERIES B-FLUIDS AND THERMAL ENGINEERING LA English DT Article DE TRANSITION PREDICTION; BOUNDARY LAYER; TURBULENT TRANSITION; CROSS-FLOW INSTABILITY; VISCOUS DRAG REDUCTION ID BOUNDARY-LAYER-TRANSITION; ROTATING-DISK; VORTICES AB Instability of boundary layers over a concave wall and a rotating disk which were thought to be essentially different in instability sources, are compared in order to investigate whether or not a single crossflow parameter can be defined. Using a newly defined crossflow parameter, prediction was attempted on a yawed cylinder boundary layer transition. By comparing the calculation with the experiment, it was found that this parameter can document fairly well the onset of crossflow instability. C1 NASA,AMES RES CTR,FLUID MECH LAB,MOFFETT FIELD,CA 94035. RP KOHAMA, Y (reprint author), TOHOKU UNIV,DEPT MACHINE INTELLIGENCE & SYST ENGN,ARAMAKI AOBA,AOBA KU,SENDAI,MIYAGI 980,JAPAN. NR 16 TC 4 Z9 5 U1 0 U2 0 PU JAPAN SOC MECHANICAL ENGINEERS SANSHIN HOKUSEI BLDG PI TOKYO PA 4-9 YOYOGI 2-CHOME SHIBUYA-KU, TOKYO 151, JAPAN SN 1340-8054 J9 JSME INT J B-FLUID T JI JSME Int. J. Ser. B-Fluids Therm. Eng. PD FEB PY 1993 VL 36 IS 1 BP 80 EP 85 PG 6 WC Thermodynamics; Engineering, Mechanical SC Thermodynamics; Engineering GA KY123 UT WOS:A1993KY12300009 ER PT J AU SLINEY, HE SPALVINS, T AF SLINEY, HE SPALVINS, T TI THE EFFECT OF ION-PLATED SILVER AND SLIDING FRICTION ON TENSILE STRESS-INDUCED CRACKING IN ALUMINUM-OXIDE SO LUBRICATION ENGINEERING LA English DT Article DE CERAMICS; STRESS ANALYSIS; SILVER; FRICTION ID CERAMICS; WEAR AB A Hertzian analysis of the effect of sliding friction on contact stresses in alumina is used to predict the critical load for crack generation. The results for uncoated alumina and alumina coated with ion-plated silver are compared. Friction coefficient inputs to the analysis are determined experimentally with a scratch test instrument employing a 0.2 mm radius diamond stylus. Series of scratches are made at constant load increments on coated and uncoated flat alumina surfaces. Critical loads for cracking are detected by microscopic examination of cross sections of scratches made at various loads and friction coefficients. Acoustic emission (AE) and friction trends are also evaluated as experimental techniques for determining critical loads for cracking. Analytical predictions correlate well with the micrographic evidence and with the lowest load at which AE is detected in multiple scratch tests. Friction/load trends are not good indicators of early crack formation. Lubrication with silver films reduced friction, and thereby increased the critical load for crack initiation in agreement with analytical predictions. C1 NASA,LEWIS RES CTR,SURFACE SCI BRANCH,CLEVELAND,OH 44135. RP SLINEY, HE (reprint author), NASA,LEWIS RES CTR,DIV MAT,CLEVELAND,OH 44135, USA. NR 15 TC 3 Z9 4 U1 0 U2 0 PU SOC TRIBOLOGISTS & LUBRICATION ENGINEERS PI PARK RIDGE PA 838 BUSSE HIGHWAY, PARK RIDGE, IL 60068 SN 0024-7154 J9 LUBR ENG JI Lubric. Eng. PD FEB PY 1993 VL 49 IS 2 BP 153 EP 159 PG 7 WC Engineering, Mechanical SC Engineering GA KL940 UT WOS:A1993KL94000007 ER PT J AU CHERN, EJ AF CHERN, EJ TI EDDY-CURRENT CHARACTERIZATION OF MAGNETIC TREATMENT OF NICKEL-200 SO MATERIALS EVALUATION LA English DT Article AB Eddy current methods have been applied to characterize the effect of magnetic treatments on component service-life extension. Coil impedance measurements were acquired and analyzed on nickel 200 specimens that have been subjected to many mechanical and magnetic engineering processes: annealing, applied strain, magnetic field, shot peening, and magnetic field after peening. Experimental results have demonstrated a functional relationship between coil impedance, resistance and reactance, and specimens subjected to various engineering processes. It has shown that magnetic treatment does induce changes in electromagnetic properties of nickel 200 that then exhibit evidence of stress relief. However, further fundamental studies are necessary for a thorough understanding of the exact mechanism of the magnetic field processing effect on machine-tool service life. RP CHERN, EJ (reprint author), NASA,GODDARD SPACE FLIGHT CTR,MAT BRANCH,GREENBELT,MD 20771, USA. NR 11 TC 0 Z9 0 U1 0 U2 0 PU AMER SOC NON-DESTRUCTIVE TEST PI COLUMBUS PA 1711 ARLINGATE LANE PO BOX 28518, COLUMBUS, OH 43228-0518 SN 0025-5327 J9 MATER EVAL JI Mater. Eval. PD FEB PY 1993 VL 51 IS 2 BP 282 EP 284 PG 3 WC Materials Science, Characterization & Testing SC Materials Science GA KL793 UT WOS:A1993KL79300007 ER PT J AU HOU, LJ PETERS, DA AF HOU, LJ PETERS, DA TI PERIODIC TRIM SOLUTIONS WITH HP-VERSION FINITE-ELEMENTS IN TIME SO MATHEMATICAL AND COMPUTER MODELLING LA English DT Article ID SHAPE FUNCTIONS AB We have studied finite elements in time as an alternative strategy for rotorcraft trim problems. The research treats linear flap and linearized flap-lag response both for quasi-trim and trim cases. The connection between Fourier series analysis and hp-finite elements for periodic problems is also examined. It is shown that Fourier series is a special case of space-time finite elements for which one element is used with a strong displacement formulation. Comparisons are made with respect to accuracy among Fourier analysis, displacement methods, and mixed methods over a variety of parameters. The hp trade-off is studied for the periodic trim problem to provide an optimum step size and optimum polynomial order for a given error criteria. It is found that finite elements in time can outperform Fourier analysis for certain given error criteria. The mixed method provides better results than does the displacement method. C1 WASHINGTON UNIV,DEPT MECH ENGN,ST LOUIS,MO 63130. RP HOU, LJ (reprint author), NASA,LEWIS RES CTR,INST COMPUTAT MECH PROPULS,CLEVELAND,OH 44135, USA. NR 17 TC 3 Z9 3 U1 0 U2 0 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0895-7177 J9 MATH COMPUT MODEL JI Math. Comput. Model. PD FEB PY 1993 VL 17 IS 3 BP 29 EP 46 DI 10.1016/0895-7177(93)90037-Y PG 18 WC Computer Science, Interdisciplinary Applications; Computer Science, Software Engineering; Mathematics, Applied SC Computer Science; Mathematics GA KN725 UT WOS:A1993KN72500004 ER PT J AU SEARS, B ANDERSON, TJ NARAYANAN, R FRIPP, AL AF SEARS, B ANDERSON, TJ NARAYANAN, R FRIPP, AL TI THE DETECTION OF SOLUTAL CONVECTION DURING ELECTROCHEMICAL MEASUREMENT OF THE OXYGEN DIFFUSIVITY IN LIQUID-TIN SO METALLURGICAL TRANSACTIONS B-PROCESS METALLURGY LA English DT Article ID SOLUBILITY AB Electrochemical titration was used as a means to determine the mass diffusivity of oxygen in liquid tin at various temperatures. Solutal convection was present depending on the conditions, and this was inferred from an enhancement in the effective diffusivity. The experiments were conducted in two different modes of operation, and in each case, we attempted to align the oxygen concentration gradient such that it was parallel to the gravitational field. In the first mode, the concentration gradient was such that the fluid was heavy at the bottom and lighter at the top, and in the second, the reverse was true. The second mode was potentially unstable and sometimes gave rise to substantial convection for large values of the oxygen concentration gradient. The measured effective diffusivities were then higher than the corresponding measurements in the first mode of operation. Activation energies in two different temperature ranges were obtained by using an Arrhenius relationship. C1 NASA,LANGLEY RES CTR,HAMPTON,VA 23655. UNIV FLORIDA,DEPT CHEM ENGN,GAINESVILLE,FL 32611. RP SEARS, B (reprint author), OHIO STATE UNIV,SCH MED,COLUMBUS,OH 43210, USA. NR 19 TC 6 Z9 6 U1 0 U2 1 PU MINERALS METALS MATERIALS SOC PI WARRENDALE PA 420 COMMONWEALTH DR, WARRENDALE, PA 15086 SN 0360-2141 J9 METALL TRANS B PD FEB PY 1993 VL 24 IS 1 BP 91 EP 100 DI 10.1007/BF02657875 PG 10 WC Metallurgy & Metallurgical Engineering SC Metallurgy & Metallurgical Engineering GA KJ821 UT WOS:A1993KJ82100010 ER PT J AU LENZEN, AJ JOHNSON, DR ATLAS, R AF LENZEN, AJ JOHNSON, DR ATLAS, R TI ANALYSIS OF THE IMPACT OF SEASAT SCATTEROMETER DATA AND HORIZONTAL RESOLUTION ON GLA MODEL SIMULATIONS OF THE QE-II STORM SO MONTHLY WEATHER REVIEW LA English DT Article ID NUMERICAL WEATHER PREDICTION; DATA ASSIMILATION; CYCLONE; WINDS AB Quasi-Lagrangian diagnostics of mass, angular momentum, water vapor, and kinetic energy are evaluated for four different Goddard Laboratory for Atmospheres model simulations of the Queen Elizabeth II storm of 9-11 September 1978 to study the impact of Seasat-A satellite scatterometer (SASS) winds and horizontal resolution in numerical prediction. In a four-way comparison, the diagnostics investigate the impact of including dealiased SASS winds in the initial conditions of the model and doubling the horizontal resolution on 36 h simulations of the QE II storm. The largest impact on the simulation stemmed from doubling the model's horizontal resolution from 4-degrees X 5-degrees to 2-degrees X 2.5-degrees. The increase resolution resulted in a storm track much closer to that observed, a much deeper surface development, a stronger mass circulation, stronger heating, and stronger increase of angular momentum. The inclusion of SASS data resulted in an approximately 2-3-mb-deeper surface cyclone for both the 2-degrees x 2.5-degrees and 4-degrees x 5-degrees resolution simulations. The inclusion also led to substantial increases in the horizontal mass circulation and heating for the 2-degrees x 2.5-degrees simulation. During the early explosive deepening phase of the cyclone, the inward lateral transport of water vapor in lower layers was larger in the 2-degrees x 2.5-degrees SASS than in the 2-degrees x 2.5-degrees NOSASS (exclusion of SASS surface winds) simulation. During the period of most rapid development, the results from the SASS simulation revealed a larger generation of kinetic energy throughout the troposphere and increased outward transport of kinetic energy in upper layers. C1 UNIV WISCONSIN,DEPT ATMOSPHER & OCEAN SCI,MADISON,WI 53706. NASA,GODDARD SPACE FLIGHT CTR,ATMOSPHERES LAB,GREENBELT,MD 20771. RP LENZEN, AJ (reprint author), UNIV WISCONSIN,CTR SPACE SCI & ENGN,1225 W DAYTON ST,MADISON,WI 53706, USA. RI Atlas, Robert/A-5963-2011 OI Atlas, Robert/0000-0002-0706-3560 NR 34 TC 6 Z9 6 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 FEB PY 1993 VL 121 IS 2 BP 499 EP 521 DI 10.1175/1520-0493(1993)121<0499:AOTIOS>2.0.CO;2 PG 23 WC Meteorology & Atmospheric Sciences SC Meteorology & Atmospheric Sciences GA KN838 UT WOS:A1993KN83800014 ER PT J AU FOXRABINOVITZ, MS GROSS, BD AF FOXRABINOVITZ, MS GROSS, BD TI DIABATIC DYNAMIC INITIALIZATION SO MONTHLY WEATHER REVIEW LA English DT Article ID NORMAL MODE INITIALIZATION; NUMERICAL WEATHER PREDICTION; SPECTRAL MODEL; SATELLITE DATA; SPECIFICATION; ASSIMILATION AB A generalized dynamical adjustment procedure has been applied to a diabatic model to produce balanced initial conditions. Namely, backward adiabatic model integration is followed by forward diabatic model integration, with a high-frequency (low-pass) filter in the form of the Euler backward time-differencing scheme being applied throughout the whole integration. As a result of the application of such a diabatic dynamic initialization procedure within the Goddard Laboratory for Atmospheres (GLA) 4D data-assimilation system, the following properties of forecasts from initialized fields are achieved right from the beginning of the usual forecast integration: 1 ) the forecast tendencies (and fields) are free of any noise due to imbalance in initial conditions, and 2) the shocks related to an initial imbalance between model physics and dynamics (and especially the substantial initial imbalance of precipitation and evaporation fields), or the initial spinup effect, are practically removed. Diabatic dynamic initialization has been compared with implicit nonlinear normal-mode initialization and found to be superior in removing the initial spinup effect and in improving the tropical structure. The diabatic dynamic initialization procedure has been successfully tested for the GLA system with the use of all conventional data and the GLA satellite data retrievals. It allows a smooth data insertion without any shocks or imbalances, which is highly desirable for efficient functioning of 4D data-assimilation systems. The developed initialization procedure is computationally efficient and in principle easily applicable to different large-scale and mesoscale forecast models. RP FOXRABINOVITZ, MS (reprint author), NASA,GODDARD SPACE FLIGHT CTR,ATMOSPHERES LAB,CODE 9103,GREENBELT,MD 20771, USA. NR 50 TC 10 Z9 10 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 FEB PY 1993 VL 121 IS 2 BP 549 EP 564 DI 10.1175/1520-0493(1993)121<0549:DDI>2.0.CO;2 PG 16 WC Meteorology & Atmospheric Sciences SC Meteorology & Atmospheric Sciences GA KN838 UT WOS:A1993KN83800017 ER PT J AU ECKBERG, DL FRITSCH, JM AF ECKBERG, DL FRITSCH, JM TI HOW SHOULD HUMAN BAROREFLEXES BE TESTED SO NEWS IN PHYSIOLOGICAL SCIENCES LA English DT Article ID SYMPATHETIC ACTIVITY; HEART-RATE; BARORECEPTOR; VAGAL AB A new approach to the study of arterial baroreflexes was developed for use during the National Aeronautics and Space Administration Spacelab Life Sciences-1 Space Shuttle mission. This method holds promise as a means to characterize the vagal limb of human baroreflex responses comprehensively and efficiently. C1 HUNTER HOLMES MCGUIRE DEPT VET AFFAIRS MED CTR,DEPT PHYSIOL,RICHMOND,VA 23249. VIRGINIA COMMONWEALTH UNIV,MED COLL VIRGINIA,RICHMOND,VA 23298. NASA,LYNDON B JOHNSON SPACE CTR,HOUSTON,TX 77058. RP ECKBERG, DL (reprint author), HUNTER HOLMES MCGUIRE DEPT VET AFFAIRS MED CTR,DEPT MED,1201 BROAD ROCK BLVD,RICHMOND,VA 23249, USA. NR 14 TC 28 Z9 28 U1 0 U2 2 PU NEWS IN PHYSIOLOGICAL SCIENCES PI BALTIMORE PA C/O WILLIAMS & WILKINS, PO BOX 1496, BALTIMORE, MD 21203 SN 0886-1714 J9 NEWS PHYSIOL SCI JI News Physiol. Sci. PD FEB PY 1993 VL 8 BP 7 EP 12 PG 6 WC Physiology SC Physiology GA KU951 UT WOS:A1993KU95100004 PM 11538169 ER PT J AU DHADWAL, HS ANSARI, RR DELLAVECCHIA, MA AF DHADWAL, HS ANSARI, RR DELLAVECCHIA, MA TI COHERENT FIBER OPTIC SENSOR FOR EARLY DETECTION OF CATARACTOGENESIS IN A HUMAN EYE LENS SO OPTICAL ENGINEERING LA English DT Article; Proceedings Paper CT CONF ON FIBER OPTIC MEDICAL AND FLUORESCENT SENSORS AND APPLICATIONS CY JAN, 1992 CL LOS ANGELES, CA SP SOC PHOTO OPT INSTRUMENTAT ENGINEERS DE BIOMEDICAL OPTICS; HUMAN LENS FIBERS; LIGHT SCATTERING; FIBER OPTIC SENSORS; CATARACTS; PROTEIN AGGREGATES ID PHOTON-CORRELATION SPECTROSCOPY; LASER DOPPLER VELOCIMETRY; LIGHT-SCATTERING; PROTEINS; TRANSPARENCY AB A lensless backscatter fiber optic probe is used to measure the size distribution of protein molecules inside an excised, but intact, human eye lens. The fiber optic probe, about 5 mm in diameter, can be positioned arbitrarily close to the anterior surface of the eye; it is a transreceiver, which delivers a Gaussian laser beam into a small region inside the lens and provides a coherent detection of the laser light scattered by the protein molecules in the backward direction. Protein sizes determined from the fast and slow diffusion coefficients show good correlation with the age of the lens and cataractogenesis. C1 NASA,LEWIS RES CTR,CWRU,CLEVELAND,OH 44135. WILLS EYE HOSP & RES INST,PHILADELPHIA,PA 19107. RP DHADWAL, HS (reprint author), SUNY STONY BROOK,DEPT ELECT ENGN,STONY BROOK,NY 11794, USA. NR 38 TC 18 Z9 18 U1 1 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 FEB PY 1993 VL 32 IS 2 BP 233 EP 238 DI 10.1117/12.60741 PG 6 WC Optics SC Optics GA KL365 UT WOS:A1993KL36500005 ER PT J AU WHITEMAN, DN MURPHY, WF WALSH, NW EVANS, KD AF WHITEMAN, DN MURPHY, WF WALSH, NW EVANS, KD TI TEMPERATURE SENSITIVITY OF AN ATMOSPHERIC RAMAN LIDAR SYSTEM BASED ON A XEF EXCIMER LASER SO OPTICS LETTERS LA English DT Article ID WATER-VAPOR AB The temperature sensitivity of Raman backscattering from atmospheric nitrogen, oxygen, and water vapor is considered over the range of temperatures expected in the troposphere. These results are applied to the Raman spectrum induced by a XeF excimer laser, which produces three line groups centered at approximately 349, 351, and 353 nm. Bandpass filter characteristics are determined for this case. C1 NATL RES COUNCIL CANADA,OTTAWA K1A 0R6,ONTARIO,CANADA. SCI SYST & APPLICAT INC,LANHAM,MD 20706. HUGHES STX,LANHAM,MD 20706. RP WHITEMAN, DN (reprint author), NASA,GODDARD SPACE FLIGHT CTR,GREENBELT,MD 20771, USA. NR 23 TC 17 Z9 17 U1 0 U2 0 PU OPTICAL SOC AMER PI WASHINGTON PA 2010 MASSACHUSETTS AVE NW, WASHINGTON, DC 20036 SN 0146-9592 J9 OPT LETT JI Opt. Lett. PD FEB 1 PY 1993 VL 18 IS 3 BP 247 EP 249 DI 10.1364/OL.18.000247 PG 3 WC Optics SC Optics GA KH453 UT WOS:A1993KH45300024 PM 19802099 ER PT J AU STANLOTTER, H SULZNER, M EGELSEER, E NORTON, CF HOCHSTEIN, LI AF STANLOTTER, H SULZNER, M EGELSEER, E NORTON, CF HOCHSTEIN, LI TI COMPARISON OF MEMBRANE ATPASES FROM EXTREME HALOPHILES ISOLATED FROM ANCIENT SALT DEPOSITS SO ORIGINS OF LIFE AND EVOLUTION OF THE BIOSPHERE LA English DT Article; Proceedings Paper CT 26TH GENERAL ASSEMBLY OF THE EUROPEAN GEOPHYSICAL SOC : WATER IN THE SOLAR SYSTEM AND ITS ROLE IN EXOBIOLOGY CY APR 22-26, 1991 CL WIESBADEN, GERMANY SP EUROPEAN GEOPHYS SOC ID ARCHAEBACTERIUM HALOBACTERIUM-SACCHAROVORUM; BOUND ATPASE; BACTERIA; PURIFICATION; SENSITIVITY; EVOLUTION; SYNTHASE; HALOBIUM; PROTEIN AB Halophilic microorganisms were isolated from Triassic and Permian salt deposits. Two were rods and grew as red colonies; another was a coccus and produced pink colonies. The rods lysed in solutions that lacked added sodium chloride. Growth of all isolates was inhibited by aphidicolin and their bulk proteins were acidic as judged from isoelectric focusing, Therefore, these organisms were tentatively identified as extreme halophiles. Whole cell proteins patterns of the isolates following gel electrophoresis were distinct and differed from those of representative type strains of halophilic bacteria. The membrane ATPases from the rods were similar to the enzyme from Halobacterium saccharovorum with respect to subunit composition, enzymatic properties and immunological cross-reaction, but differed slightly in amino acid composition. If the age of the microbial isolated is similar to that of the salt deposits, they can be considered repositories of molecular information of great evolutionary interest. C1 UNIV MAINE,DEPT BIOL,AUGUSTA,ME 04330. NASA,AMES RES CTR,MOFFETT FIELD,CA 94035. RP STANLOTTER, H (reprint author), UNIV VIENNA,INST MICROBIOL & GENET,DR BOHRG 9,A-1030 VIENNA,AUSTRIA. NR 37 TC 19 Z9 21 U1 0 U2 3 PU KLUWER ACADEMIC PUBL PI DORDRECHT PA SPUIBOULEVARD 50, PO BOX 17, 3300 AA DORDRECHT, NETHERLANDS SN 0169-6149 J9 ORIGINS LIFE EVOL B JI Orig. Life Evol. Biosph. PD FEB PY 1993 VL 23 IS 1 BP 53 EP 64 DI 10.1007/BF01581990 PG 12 WC Biology SC Life Sciences & Biomedicine - Other Topics GA KJ273 UT WOS:A1993KJ27300007 PM 11536526 ER PT J AU HO, YK BHATIA, AK AF HO, YK BHATIA, AK TI P-WAVE SHAPE RESONANCES IN POSITRONIUM IONS SO PHYSICAL REVIEW A LA English DT Note ID NEGATIVE-ION; STATES; PHOTODETACHMENT; ANNIHILATION; SYSTEMS AB A 1P(o) shape resonance in Ps- lying above the n = 2 Ps threshold is calculated using the method of complex-coordinate rotation with Hylleraas-type wave functions. Comparison is made with a calculation using adiabatic potential curves. We also report new results for 3P(o) shape resonances lying above the n = 3 and 7 thresholds. C1 NASA,GODDARD SPACE FLIGHT CTR,ASTRON & SOLAR PHYS LAB,GREENBELT,MD 20771. RP HO, YK (reprint author), LOUISIANA STATE UNIV,DEPT PHYS & ASTRON,BATON ROUGE,LA 70803, USA. RI Ho, Yew Kam/F-7912-2012 NR 21 TC 13 Z9 13 U1 0 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 FEB PY 1993 VL 47 IS 2 BP 1497 EP 1499 DI 10.1103/PhysRevA.47.1497 PG 3 WC Optics; Physics, Atomic, Molecular & Chemical SC Optics; Physics GA KV979 UT WOS:A1993KV97900093 ER PT J AU HAHNE, GE AF HAHNE, GE TI TRANSITION OPERATORS IN ELECTROMAGNETIC-WAVE DIFFRACTION THEORY .2. APPLICATIONS TO OPTICS SO PHYSICAL REVIEW E LA English DT Article ID ROUGH SURFACES; MATRIX METHOD; T-MATRIX; SCATTERING; EXTENSION; EQUATIONS AB This paper is the second of a series. The first [G. E. Hahne, Phys. Rev. A 45, 7526 (1992)] developed a general theory of the transition operator approach to diffraction of time-harmonic electromagnetic waves from fixed obstacles, such that the response of the obstacle, denoted by OMEGA, to an impinging electromagnetic signal with wave number k0 was simulated by nonlocal, homogeneous Leontovich (i.e., impedance) boundary conditions on the obstacle's surface, which surface is called partial derivative OMEGA. Moreover, the exterior region, called OMEGA(ex), was presumed to be unbounded empty space, and has an electromagnetic response that can be expressed in terms of the so-called radiation impedance operator, denoted Z(k)0+; Z(k)0+ is a certain invertible, linear functional operator that maps the space of complex tangent-vector fields on partial derivative OMEGA into itself The matching of the limiting tangential electric and magnetic fields on partial derivative OMEGA yielded a functional-operator expression for the transition operator and thereby a formal reduction to quadratures of the entire direct-scattering problem. This paper is intended to serve as an illustration and elaboration of the formalism presented in the first paper. After a brief recapitulation of the theory, the following topics are dealt with. First, an infinite sum in terms of vector spherical harmonics is obtained for Z(k)0+ for partial derivative OMEGA a sphere. Second, a quasiplanar approximation, based directly on the exact result for planar partial derivative OMEGA, is obtained for Z(k)0+ when \k0\ is large compared to the local surface curvatures of partial derivative OMEGA and attention can be restricted to small neighborhoods on partial derivative OMEGA; when augmented by the method of stationary phase, this approximation is shown to lead to the familiar physical optics method for smooth, convex surfaces. Third, the latter method, supported by further interventions of the method of stationary phase, is applied in a well-established manner to secure the results of geometrical optics for the complete Green's function for the time-harmonic Maxwell field in the presence of a smooth-surfaced, convex, perfectly electrically conducting obstacle. One feature of the latter computations is that the original source currents from which the free-space Maxwell Green's function is constructed are presumed to generate ordinary outgoing (''causal'') electromagnetic waves for electric current sources, and purely ingoing (''anticausal'') waves for magnetic current sources (i.e., sinks) of electromagnetic radiation. Fourth, a formal construction is derived for mapping the Leontovich boundary conditions on an inner surface into a set of Leontovich boundary conditions on an outer surface, in the circumstance that a layer comprised of a material medium, which has possibly nonuniform and nonsymmetric tensors representing its constitutive properties, fills the domain between the surfaces; the construction presumes that a Green's function is available for the corresponding Maxwell equations in the medium when the medium is extended appropriately to fill all space. The main body of the paper concludes with a brief discussion of directions of possible future work and applications. The first appendix shows how to apply the method of stationary phase in the present context, in particular for the mixed case that the original radiation source is anticausal and the response currents generated in the obstacle are causal sources of radiation. A second appendix develops an acoustic (Helmholtz equation) analog to the fourth topic mentioned above, and exhibits an interplay of the theory with symplectic transformations in the case that the principle of reciprocity holds; it is noted that a symplectic connection also exists in the electromagnetic case when the propagation medium's constitutive properties are such that reciprocity holds. RP HAHNE, GE (reprint author), NASA,AMES RES CTR,COMPUTAT CHEM BRANCH,MOFFETT FIELD,CA 94035, USA. NR 66 TC 1 Z9 1 U1 0 U2 2 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 1063-651X J9 PHYS REV E JI Phys. Rev. E PD FEB PY 1993 VL 47 IS 2 BP 1337 EP 1364 DI 10.1103/PhysRevE.47.1337 PG 28 WC Physics, Fluids & Plasmas; Physics, Mathematical SC Physics GA KY136 UT WOS:A1993KY13600071 ER PT J AU HATAY, FF BIRINGEN, S ERLEBACHER, G ZORUMSKI, WE AF HATAY, FF BIRINGEN, S ERLEBACHER, G ZORUMSKI, WE TI STABILITY OF HIGH-SPEED COMPRESSIBLE ROTATING COUETTE-FLOW SO PHYSICS OF FLUIDS A-FLUID DYNAMICS LA English DT Article ID DYNAMICAL STABILITY; CYLINDERS; DISKS AB In this study, the linear stability of high-speed, rotating Couette flow to two- and three-dimensional disturbances in finite-gap spacings, including the full effects of compressibility and viscosity, is considered. Particularly, the combined effects of Mach number, Reynolds number, radial heating, and gap spacing are investigated. For a stationary outer cylinder, the primary instability is an axisymmetric mode independent of the Mach number. Increasing Mach numbers have a destabilizing effect for wide gaps, and a stabilizing effect for narrow gaps. For a sufficiently fast, counter-rotating outer cylinder, the primary instability becomes a three-dimensional traveling wave. Compressibility has a stabilizing effect on these modes regardless of the pp width; also, heating at the outer cylinder stabilizes the flow. Bicritical points for the primary instability corresponding to the crossover of the azimuthal wave numbers are determined for cylinders counter-rotating with equal angular speed. C1 NASA,LANGLEY RES CTR,INST COMP APPLICAT SCI & ENGN,HAMPTON,VA 23665. NASA,LANGLEY RES CTR,DIV ACOUST,HAMPTON,VA 23665. RP HATAY, FF (reprint author), UNIV COLORADO,DEPT AEROSP ENGN SCI,CAMPUS BOX 429,BOULDER,CO 80309, USA. NR 24 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 0899-8213 J9 PHYS FLUIDS A-FLUID PD FEB PY 1993 VL 5 IS 2 BP 393 EP 404 DI 10.1063/1.858887 PG 12 WC Mechanics; Physics, Fluids & Plasmas SC Mechanics; Physics GA KJ516 UT WOS:A1993KJ51600011 ER PT J AU LAU, YT FINN, JM AF LAU, YT FINN, JM TI FAST DYNAMOS WITH FINITE RESISTIVITY IN STEADY FLOWS WITH STAGNATION POINTS SO PHYSICS OF FLUIDS B-PLASMA PHYSICS LA English DT Article ID LONG-TIME CORRELATIONS; UNSTEADY FLOWS; MAGNETIC-FIELD; 3 DIMENSIONS; SYSTEMS; FLUID; NULLS; MAPS AB Results of the kinematic fast dynamo problem for two classes of steady incompressible flows are presented. These flows are the ABC flow and the spatially aperiodic flow of Lau and Finn [Physica D 57, 238 (1992)]. In a range of parameters, these three-dimensional flows have stagnation points (A and B type) and there are chaotic streamlines. The chaos is associated with the intermingled stable and unstable manifolds of the stagnation points. In the aperiodic flow the chaos takes the form of chaotic scattering. The growth rate of the dynamos for the aperiodic flow is found to obey a certain scaling law with resistivity eta (as eta --> 0), from which the results are extrapolated to the limit eta --> 0 (infinite magnetic Reynolds number). Numerical results are presented indicating that fast kinematic dynamos can exist in these flows and that chaotic flow is a necessary condition. The structure of the dynamo magnetic fields is also shown, in particular, the relationship between the regions of maximal field strength and the invariant dynamical structures of the aperiodic flow. For the aperiodic flow, the unstable mode has a real frequency and these regions consist of two fingers of oppositely directed field. These regions rotate about a streamline (the one-dimensional unstable manifold) coming out of the type A stagnation point. For the ABC flow with A = B = C, it is found that there are two dynamo modes: an oscillating mode and a purely growing mode. The mode crossing occurs at magnetic Reynolds number between 300 and 350, with the purely growing mode dominating for larger magnetic Reynolds numbers. For the oscillating mode, the region of large Absolute value of B is similar to that for the aperiodic flow. For the purely growing mode, the region of large Absolute value of B is localized in single fingers about the one-dimensional unstable manifolds. The distribution function of In Absolute value of B is observed to be approximately Gaussian for both modes of the ABC flow. The distribution function for the mode found for the aperiodic flow has a much more complex structure, apparently associated with the escape of streamlines in chaotic scattering. C1 UNIV MARYLAND,PLASMA RES LAB,COLL PK,MD 20742. RP LAU, YT (reprint author), NASA,GODDARD SPACE FLIGHT CTR,NATL RES COUNCIL,MAIL CODE 9301,GREENBELT,MD 20771, USA. NR 30 TC 25 Z9 25 U1 1 U2 2 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0899-8221 J9 PHYS FLUIDS B-PLASMA PD FEB PY 1993 VL 5 IS 2 BP 365 EP 375 DI 10.1063/1.860522 PG 11 WC Physics, Fluids & Plasmas SC Physics GA KL787 UT WOS:A1993KL78700009 ER PT J AU GOODWIN, TJ SCHROEDER, WF WOLF, DA MOYER, MP AF GOODWIN, TJ SCHROEDER, WF WOLF, DA MOYER, MP TI ROTATING-WALL VESSEL COCULTURE OF SMALL-INTESTINE AS A PRELUDE TO TISSUE MODELING - ASPECTS OF SIMULATED MICROGRAVITY SO PROCEEDINGS OF THE SOCIETY FOR EXPERIMENTAL BIOLOGY AND MEDICINE LA English DT Article ID EPITHELIAL-CELLS; EXTRACELLULAR-MATRIX; GROWTH-FACTORS; DIFFERENTIATION; CULTURE; INVITRO; EXPRESSION; MORPHOGENESIS; ANTIBODIES; ORGAN AB A new low shear stress, low turbulence microcarrier culture system has been developed at NASA's Johnson Space Center that permits large-scale three-dimensional tissue culture. Tissue culture bioreactors called rotating-wall vessels were used in conjunction with multicellular cocultivation to develop a unique in vitro tissue-modeling system. Normal small intestine epithelium and mesenchymal cells were cocultivated on Cytodex-3 microcarriers and were initiated in two phases. Normal small intestine mesenchymal cells were inoculated into the rotating-wall vessel at 2 x 10(5) cells/ml and allowed to attach and proliferate for 2 to 3 days. Normal small intestine epithelium was then added at an innoculum of 2 x 10(5) cells/ml and cultivation continued for 30 to 40 days. These cocultures attained cell numbers of 4-6 x 10(6) cells/ml and differentiated to form tissue-like masses of 0.4-0.5 cm with minimal necrosis. The masses displayed apical brush borders, differentiated epithelial cells, cellular polarity, extracellular matrix, and basal lamina. Verification of mesenchymal and epithelial cell expression was determined by immunocytochemistry and scanning electron microscopy. These data suggest that the rotating-wall vessel affords a new tissue culture model for investigation of growth, regulatory, and differentiation processes within normal tissues. C1 MED OPERAT & RES BRANCH,HOUSTON,TX 77058. UNIV TEXAS,HLTH SCI CTR,SAN ANTONIO,TX 78284. NASA,LYNDON B JOHNSON SPACE CTR,HOUSTON,TX 77058. RP GOODWIN, TJ (reprint author), KRUG LIFE SCI,1290 HERCULES,SUITE 120,HOUSTON,TX 77058, USA. NR 43 TC 65 Z9 65 U1 1 U2 9 PU BLACKWELL SCIENCE INC PI CAMBRIDGE PA 238 MAIN ST, CAMBRIDGE, MA 02142 SN 0037-9727 J9 P SOC EXP BIOL MED JI Proc. Soc. Exp. Biol. Med. PD FEB PY 1993 VL 202 IS 2 BP 181 EP 192 PG 12 WC Medicine, Research & Experimental SC Research & Experimental Medicine GA KJ373 UT WOS:A1993KJ37300008 PM 8424108 ER PT J AU PETERSON, LE PEPPER, LJ HAMM, PB GILBERT, SL AF PETERSON, LE PEPPER, LJ HAMM, PB GILBERT, SL TI LONGITUDINAL-STUDY OF ASTRONAUT HEALTH - MORTALITY IN THE YEARS 1959-1991 SO RADIATION RESEARCH LA English DT Article ID OCCUPATIONAL RADIATION; CHARGED-PARTICLES; RHESUS-MONKEYS; WORKERS; EXPOSURE; NUCLEAR; CANCER; CATARACT; PILOTS; COHORT C1 UNIV TEXAS,SCH PUBL HLTH,EPIDEMIOL RES UNIT,HOUSTON,TX 77225. LONGITUDINAL STUDIES KRUG LIFE SCI,HOUSTON,TX 77058. NASA,LYNDON B JOHNSON SPACE CTR,FLIGHT MED CLIN,HOUSTON,TX 77058. RP PETERSON, LE (reprint author), KELSEY SEYBOLD CLIN,MED SUPPORT SERV,HOUSTON,TX 77058, USA. OI Peterson, Leif/0000-0002-1187-0883 NR 45 TC 18 Z9 19 U1 1 U2 1 PU RADIATION RESEARCH SOC PI OAK BROOK PA 2021 SPRING RD, STE 600, OAK BROOK, IL 60521 SN 0033-7587 J9 RADIAT RES JI Radiat. Res. PD FEB PY 1993 VL 133 IS 2 BP 257 EP 264 DI 10.2307/3578364 PG 8 WC Biology; Biophysics; Radiology, Nuclear Medicine & Medical Imaging SC Life Sciences & Biomedicine - Other Topics; Biophysics; Radiology, Nuclear Medicine & Medical Imaging GA KN250 UT WOS:A1993KN25000016 PM 8438068 ER PT J AU BRAKKE, TW WERGIN, WP ERBE, EF HARNDEN, JM AF BRAKKE, TW WERGIN, WP ERBE, EF HARNDEN, JM TI SEASONAL-VARIATION IN THE STRUCTURE AND RED REFLECTANCE OF LEAVES FROM YELLOW POPLAR, RED OAK, AND RED MAPLE SO REMOTE SENSING OF ENVIRONMENT LA English DT Article ID BIDIRECTIONAL SCATTERING; SPECULAR REFLECTANCE; EPICUTICULAR WAXES; LIGHT; LEAF; VEGETATION; PLANTS; PENETRATION; RADIATION; EPIDERMIS AB A laboratory goniometer was used to measure the light scattered from leaves as a function of view angle in the principal plane for yellow poplar (Liriodendron tulipifera L.), red oak (Quercus rubra L), and red maple (Acer rubrum L.). The source was a parallel-polarized helium-neon laser (632.8 nm). Yellow poplar leaves had the highest reflectance of the three species, which may have been due to its shorter palisade cells and more extensive spongy mesophyll. Prior to senescence, there was a significant decrease, but not total extinction, in the reflectance of the beam incident at 600 from nadir on the adaxial (upper) side of the leaves of all three species. This was interpreted as a Brewster angle effect. The reflectance increased as the leaves senesced. The abaxial (lower) side of the leaf did not exhibit the reflectance decrease at the Brewster angle, indicating that multiple reflections were obscuring the effect. The multiple reflections could have been from either the spongy mesophyll or from the abaxial surface (which was rougher than the adaxial). Low-temperature scanning electron microscope (SEM) observations showed differences in the surface wax patterns among the three species but did not indicate a cause of the reflectance changes other than possibly the accumulation and aging of the wax. SEM observations confirmed the greater roughness of the abaxial side of the leaf. This type of information on leaf bidirectional scattering should be useful for linking remote sensing observations with leaf optical properties. C1 USDA ARS,BELTSVILLE AGR RES CTR,ELECTRON MICROSCOPY LAB,BELTSVILLE,MD 20705. NASA,GODDARD SPACE FLIGHT CTR,SENSOR CONCEPT & DEV BRANCH,GREENBELT,MD 20771. RP BRAKKE, TW (reprint author), NASA,GODDARD SPACE FLIGHT CTR,BIOSPHER SCI BRANCH,CODE 923,GREENBELT,MD 20771, USA. NR 50 TC 17 Z9 17 U1 1 U2 11 PU ELSEVIER SCIENCE INC PI NEW YORK PA 655 AVENUE OF THE AMERICAS, NEW YORK, NY 10010 SN 0034-4257 J9 REMOTE SENS ENVIRON JI Remote Sens. Environ. PD FEB PY 1993 VL 43 IS 2 BP 115 EP 130 DI 10.1016/0034-4257(93)90001-E PG 16 WC Environmental Sciences; Remote Sensing; Imaging Science & Photographic Technology SC Environmental Sciences & Ecology; Remote Sensing; Imaging Science & Photographic Technology GA KK487 UT WOS:A1993KK48700001 ER PT J AU KIMES, DS IRONS, JR LEVINE, ER HORNING, NA AF KIMES, DS IRONS, JR LEVINE, ER HORNING, NA TI LEARNING CLASS DESCRIPTIONS FROM A DATA-BASE OF SPECTRAL REFLECTANCE OF SOIL SAMPLES SO REMOTE SENSING OF ENVIRONMENT LA English DT Article ID INSTRUMENT AB A program was developed to learn class descriptions from positive and negative training examples of spectral reflectance data of bare soils. The program combined a form of learning referred to as ''learning by example'' with the generate-and-test paradigm to provide a robust learning environment that could handle error prone data. The program was tested by hating it learn class descriptions of various categories of organic carbon content, iron oxide content, and particle size distribution in soils. These class descriptions were then used to classify an array of targets. The class descriptions in this program were comprised of a series of different relationships (greater-than, first-maximum, second-maximum, first-minimum, second-minimum, convex, and concave) between combinations of spectral bands. The program found the sequence of relationships between bands that contained the most important information to distinguish the classes. The concept being learned was a sequence of relationships that optimized the discrimination of a class. Training examples of spectral reflectance data of bare soils were taken from data of Stoner and Baumgardner (1981). Classes of any soil characteristic that is in the data base can be explored. The characteristics include organic carbon content, iron oxide content, particle size distribution, soil order, mineralogy, cation exchange capacity, drainage class, and Munsell color. Combinations of the first four characteristics were used to make class descriptions that were used to classify the soil samples into the five classes observed by Stoner and Baumgardner (1981). Other classes of organic carbon, iron oxide, drainage, and clay content were explored using this method. The program was tested by learning class descriptions of these classes and subsequently classifying an array of unknown soil data. The results showed a high classification accuracy of 77 % for separating classes of high and low organic carbon content. Physical explanations for the class descriptions obtained were presented. C1 STX SYST CORP,LANHAM,MD. RP KIMES, DS (reprint author), NASA,GODDARD SPACE FLIGHT CTR,BIOSPHER SCI BRANCH,CODE 923,GREENBELT,MD 20771, USA. RI Irons, James/D-8535-2012 NR 20 TC 12 Z9 12 U1 0 U2 1 PU ELSEVIER SCIENCE INC PI NEW YORK PA 655 AVENUE OF THE AMERICAS, NEW YORK, NY 10010 SN 0034-4257 J9 REMOTE SENS ENVIRON JI Remote Sens. Environ. PD FEB PY 1993 VL 43 IS 2 BP 161 EP 169 DI 10.1016/0034-4257(93)90005-I PG 9 WC Environmental Sciences; Remote Sensing; Imaging Science & Photographic Technology SC Environmental Sciences & Ecology; Remote Sensing; Imaging Science & Photographic Technology GA KK487 UT WOS:A1993KK48700005 ER PT J AU MARTUS, KE ORIENT, OJ HODGES, RR CHUTJIAN, A AF MARTUS, KE ORIENT, OJ HODGES, RR CHUTJIAN, A TI THEORY AND OPERATION OF A 3-GATE TIME-OF-FLIGHT VELOCITY ANALYZER SO REVIEW OF SCIENTIFIC INSTRUMENTS LA English DT Article ID SQUARE-WAVE GENERATOR; HIGH-VOLTAGE AB Theoretical considerations and test results are presented for a new-type velocity analyzer for incident fast neutral particles, positive ions, and negative ions. Velocity analysis is carried out by means of a pulsed, three-gate time-of-flight (TOF) technique capable of eliminating alias velocities (harmonics) to sixth order. In addition the design and operation are presented of a four-element ion lens system, with small spherical and chromatic aberrations, suitable for interfacing a large-diameter ion beam from the TOF section with a subsequent mass analyzer. C1 UNIV TEXAS,CTR SPACE SCI,RICHARDSON,TX 75083. RP MARTUS, KE (reprint author), JET PROP LAB,PASADENA,CA 91109, USA. NR 18 TC 1 Z9 1 U1 1 U2 1 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0034-6748 J9 REV SCI INSTRUM JI Rev. Sci. Instrum. PD FEB PY 1993 VL 64 IS 2 BP 470 EP 476 DI 10.1063/1.1144217 PG 7 WC Instruments & Instrumentation; Physics, Applied SC Instruments & Instrumentation; Physics GA KM799 UT WOS:A1993KM79900026 ER PT J AU PARMAR, DS HOLMES, HK AF PARMAR, DS HOLMES, HK TI SKIN FRICTION MEASUREMENT WITH PARTIALLY EXPOSED POLYMER DISPERSED LIQUID-CRYSTALS SO REVIEW OF SCIENTIFIC INSTRUMENTS LA English DT Article AB Partially exposed polymer dispersed liquid crystal thin film (10-25 mum) deposited on a flat glass substrate has been used for the first time to measure skin friction. Utilizing the shear stress induced director reorientation in the partially exposed liquid crystal droplets, optical transmission under crossed polarization has been measured as a function of the air flow differential pressure. Direct measurement of the skin friction with a skin friction drag balance, under the same aerodynamic conditions, lets us correlate the skin friction with optical transmission. This provides a unique technique for the direct measurement of skin friction from the transmitted light intensity. The results are in excellent agreement with the model suggested in this paper. C1 NASA,LANGLEY RES CTR,HAMPTON,VA 23681. NR 15 TC 4 Z9 4 U1 0 U2 3 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0034-6748 J9 REV SCI INSTRUM JI Rev. Sci. Instrum. PD FEB PY 1993 VL 64 IS 2 BP 538 EP 541 DI 10.1063/1.1144229 PG 4 WC Instruments & Instrumentation; Physics, Applied SC Instruments & Instrumentation; Physics GA KM799 UT WOS:A1993KM79900039 ER PT J AU HUYNH, HT AF HUYNH, HT TI ACCURATE MONOTONE CUBIC INTERPOLATION SO SIAM JOURNAL ON NUMERICAL ANALYSIS LA English DT Article DE MONOTONICITY-PRESERVING INTERPOLATION; CUBIC HERMITE INTERPOLATION ID HIGH-RESOLUTION SCHEMES; CONSERVATIVE DIFFERENCE SCHEME; ENO SCHEMES; ORDER; LAWS AB Monotone piecewise cubic interpolants are simple and effective. They are generally third-order accurate, except near strict local extrema where accuracy degenerates to second order due to the monotonicity constraint. Algorithms for piecewise cubic interpolants that preserve monotonicity as well as uniform third- and fourth-order accuracy are presented. The gain of accuracy is obtained by relaxing the monotonicity constraint in a geometric framework in which the median function plays a crucial role. These algorithms can also be applied to the reconstruction step in shock-capturing methods for conservation laws. RP HUYNH, HT (reprint author), NASA,LEWIS RES CTR,MS 5-11,CLEVELAND,OH 44135, USA. NR 30 TC 54 Z9 54 U1 0 U2 3 PU SIAM PUBLICATIONS PI PHILADELPHIA PA 3600 UNIV CITY SCIENCE CENTER, PHILADELPHIA, PA 19104-2688 SN 0036-1429 J9 SIAM J NUMER ANAL JI SIAM J. Numer. Anal. PD FEB PY 1993 VL 30 IS 1 BP 57 EP 100 DI 10.1137/0730004 PG 44 WC Mathematics, Applied SC Mathematics GA KM976 UT WOS:A1993KM97600004 ER PT J AU NAIK, NH VANROSENDALE, J AF NAIK, NH VANROSENDALE, J TI THE IMPROVED ROBUSTNESS OF MULTIGRID ELLIPTIC SOLVERS BASED ON MULTIPLE SEMICOARSENED GRIDS SO SIAM JOURNAL ON NUMERICAL ANALYSIS LA English DT Article; Proceedings Paper CT 5TH COPPER MOUNTAIN CONF ON MULTIGRID METHODS CY MAR 31-APR 05, 1991 CL DENVER, CO SP USAF, OFF SCI RES, NATL SCI FDN, IBM DE PARALLEL MULTIGRID; SEMICOARSENED MULTIGRID; MULTIGRID AB Multigrid convergence rates degenerate on problems with stretched grids or anisotropic operators, unless one uses line or plane relaxation. For three-dimensional problems, only plane relaxation suffices, in general. While line and plane relaxation algorithms are efficient on sequential machines, they are quite awkward and inefficient on parallel machines. This paper presents a new multigrid algorithm, based on the use of multiple coarse grids, that eliminates the need for line or plane relaxation in anisotropic problems. This algorithm is developed, and the standard multigrid theory is extended to establish rapid convergence for this class of algorithms. The new algorithm uses only point relaxation, allowing easy and efficient parallel implementation, yet achieves robustness and convergence rates comparable to line and plane relaxation multigrid algorithms. The algorithm described here is a variant of Mulder's multigrid algorithm [W. Mulder, J. Comput. Phys., 83 (1989), pp. 303-323] for hyperbolic problems. The latter uses multiple coarse grids to achieve robustness, and appears to work on elliptic as well as hyperbolic problems, though it is more complex than the algorithm proposed here, and its rapid convergence has never been proven. The new algorithm combines the contributions from the multiple coarse grids via a local ''switch,'' based on the strength of the discrete operator in each coordinate direction. This improvement allows us to show that the V-cycle convergence rate is uniformly bounded away from one, on model anisotropic problems. Moreover, the new algorithm can be combined with the idea of concurrent iteration on all multigrid levels to yield a highly parallel algorithm for strongly anisotropic problems. RP NAIK, NH (reprint author), NASA,LANGLEY RES CTR,ICASE,MAILSTOP 132C,HAMPTON,VA 23665, USA. NR 6 TC 28 Z9 28 U1 0 U2 1 PU SIAM PUBLICATIONS PI PHILADELPHIA PA 3600 UNIV CITY SCIENCE CENTER, PHILADELPHIA, PA 19104-2688 SN 0036-1429 J9 SIAM J NUMER ANAL JI SIAM J. Numer. Anal. PD FEB PY 1993 VL 30 IS 1 BP 215 EP 229 DI 10.1137/0730010 PG 15 WC Mathematics, Applied SC Mathematics GA KM976 UT WOS:A1993KM97600010 ER PT J AU CROSBY, NB ASCHWANDEN, MJ DENNIS, BR AF CROSBY, NB ASCHWANDEN, MJ DENNIS, BR TI FREQUENCY-DISTRIBUTIONS AND CORRELATIONS OF SOLAR-X-RAY FLARE PARAMETERS SO SOLAR PHYSICS LA English DT Article ID SELF-ORGANIZED CRITICALITY; ENERGY-SPECTRA; BURSTS; MICROFLARES AB We have determined frequency distributions of flare parameters from over 12000 solar flares recorded with the Hard X-Ray Burst Spectrometer (HXRBS) on the Solar Maximum Mission (SMM) satellite. These parameters include the flare duration, the peak counting rate, the peak hard X-ray flux, the total energy in electrons, and the peak energy flux in electrons (the latter two computed assuming a thick-target flare model). The energies were computed above a threshold energy between 25 and 50 keV. All of the distributions can be represented by power laws above the HXRBS sensitivity threshold. Correlations among these parameters are determined from linear regression fits as well as from the slopes of the frequency distributions. Variations of the frequency distributions were investigated with respect to the solar activity cycle. Theoretical models for the frequency distribution of flare parameters depend on the probability of flaring and the temporal evolution of the flare energy build-up. Our results are consistent with stochastic flaring and exponential energy build-up, with an average build-up time constant that is 0.5 times the mean time between flares. The measured distributions of flares are also consistent with predicted distributions of flares from computer simulations of avalanche models that are governed by the principle of self-organized criticality. C1 CATHOLIC UNIV AMER,WASHINGTON,DC 20064. UNIV MARYLAND,DEPT ASTRON,COLL PK,MD 20742. RP CROSBY, NB (reprint author), NASA,GODDARD SPACE FLIGHT CTR,ASTRON & SOLAR PHYS LAB,GREENBELT,MD 20771, USA. RI Dennis, Brian/C-9511-2012 NR 27 TC 337 Z9 341 U1 4 U2 9 PU KLUWER ACADEMIC PUBL PI DORDRECHT PA SPUIBOULEVARD 50, PO BOX 17, 3300 AA DORDRECHT, NETHERLANDS SN 0038-0938 J9 SOL PHYS JI Sol. Phys. PD FEB PY 1993 VL 143 IS 2 BP 275 EP 299 DI 10.1007/BF00646488 PG 25 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA KL436 UT WOS:A1993KL43600007 ER PT J AU BARTHELEMY, JFM HAFTKA, RT AF BARTHELEMY, JFM HAFTKA, RT TI APPROXIMATION CONCEPTS FOR OPTIMUM STRUCTURAL DESIGN - A REVIEW SO STRUCTURAL OPTIMIZATION LA English DT Review AB This paper reviews the basic approximation concepts used in structural optimization. It also discusses some of the most recent developments in that area since the introduction of approximation concepts in the mid-seventies. The paper distinguishes between local, medium-range and global approximations; it covers function approximations and problem approximations. It shows that, although the lack of comparative data established on reference test cases prevents an accurate assessment, there have been significant improvements. The largest number of developments have been in the areas of local function approximations and use of intermediate variable and response quantities. It appears also that some new methodologies emerge which could greatly benefit from the introduction of new computer architectures. RP BARTHELEMY, JFM (reprint author), NASA,LANGLEY RES CTR,MS246,HAMPTON,VA 23681, USA. RI UF, MDO/G-8720-2012 NR 0 TC 276 Z9 283 U1 0 U2 15 PU SPRINGER VERLAG PI NEW YORK PA 175 FIFTH AVE, NEW YORK, NY 10010 SN 0934-4373 J9 STRUCT OPTIMIZATION JI Struct. Optim. PD FEB PY 1993 VL 5 IS 3 BP 129 EP 144 DI 10.1007/BF01743349 PG 16 WC Computer Science, Interdisciplinary Applications; Engineering, Multidisciplinary; Mechanics SC Computer Science; Engineering; Mechanics GA KK555 UT WOS:A1993KK55500001 ER PT J AU ROSEN, R WILLIAMS, LJ AF ROSEN, R WILLIAMS, LJ TI THE REBIRTH OF SUPERSONIC TRANSPORT SO TECHNOLOGY REVIEW LA English DT Article C1 NASA,AERONAUT PROGRAM,WASHINGTON,DC 20546. NR 0 TC 1 Z9 1 U1 0 U2 0 PU MASS INST TECHNOL PI CAMBRIDGE PA CAMBRIDGE, MA 02139 SN 0040-1692 J9 TECHNOL REV JI Technol. Rev. PD FEB-MAR PY 1993 VL 96 IS 2 BP 22 EP 29 PG 8 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA KJ026 UT WOS:A1993KJ02600020 ER PT J AU BAUSCHLICHER, CW LANGHOFF, SR PARTRIDGE, H SODUPE, M AF BAUSCHLICHER, CW LANGHOFF, SR PARTRIDGE, H SODUPE, M TI DETERMINATION OF THE STRUCTURE AND BOND-ENERGIES OF NIO2 AND CUO2 SO JOURNAL OF PHYSICAL CHEMISTRY LA English DT Article ID GAUSSIAN-BASIS SETS; ELECTRON-SPIN-RESONANCE; MOLECULAR CALCULATIONS; DIOXYGEN COMPLEXES; OXYGEN MOLECULES; MATRIX REACTIONS; METAL ATOMS; ROW ATOMS; CONTRACTION; SPECTRUM AB On the basis of extensive ab initio calculations, we estimate the metal-O2 binding energies of NiO2 and CuO2 to be 48 +/- 7 and 18 +/- 4 kcal/mol, respectively. We feel that the experimental estimate of 57 +/- 10 kcal/mol for the binding energy of NiO2 is slightly too large, while we are in complete agreement with the experimental estimate of 15(-5)+10 kcal/mol for CuO2. While the 1A1 ground state of NiO2 definitely has a side-on C2v structure, matrix isolation studies suggest that CuO2 has an end-on C(s) structure. Calculations at the coupled-cluster singles plus doubles level with a perturbational estimate of triple excitations, CCSD(T), produce a 2A2 state with C2v as a global minimum. However, the entire 2A'' ground-state surface is exceedingly flat, precluding a reliable determination of the gas-phase equilibrium structure. RP BAUSCHLICHER, CW (reprint author), NASA,AMES RES CTR,MOFFETT FIELD,CA 94035, USA. RI Sodupe, Mariona/E-9352-2013 OI Sodupe, Mariona/0000-0003-0276-0524 NR 37 TC 49 Z9 49 U1 0 U2 6 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 JAN 28 PY 1993 VL 97 IS 4 BP 856 EP 859 DI 10.1021/j100106a010 PG 4 WC Chemistry, Physical SC Chemistry GA KJ719 UT WOS:A1993KJ71900010 ER PT J AU BLEWITT, G HEFLIN, MB HURST, KJ JEFFERSON, DC WEBB, FH ZUMBERGE, JF AF BLEWITT, G HEFLIN, MB HURST, KJ JEFFERSON, DC WEBB, FH ZUMBERGE, JF TI ABSOLUTE FAR-FIELD DISPLACEMENTS FROM THE 28 JUNE 1992 LANDERS EARTHQUAKE SEQUENCE SO NATURE LA English DT Article ID GLOBAL POSITIONING SYSTEM; CALIFORNIA; PRECISION; ORBIT AB ON 28 June 1992, the largest earthquake in California in 40 years (surface-wave magnitude M(s) = 7.5) occurred near the small town of Landers, in southeastern California, and was followed three hours later by the nearby M(s) 6.5 Big Bear earthquake1. Fortuitously, the Landers earthquake sequence coincided with the first week of the official three-month test period of the International Global Positioning System and Geodynamics Service2 (IGS), giving us an unprecendented opportunity to detect absolute pre-, co- and post-seismic displacements at a distance of 50-200 km from the main rupture with millimetre-level precision. Mutual and independent confirmation of some of our geodetic results are demonstrated by Bock et al. in this issue3. For the Landers earthquake, the observed displacements indicate that the depth of the bottom of the rupture is shallower towards the northern end, displacements were dominantly symmetric, and the rupture extended further south on the Johnson Valley fault than has been mapped on the basis of surface ground offsets. The combined geodetic moment for the Landers and Big Bear earthquakes (1.1 x 10(20) N m-1) agrees well with teleseismic estimates. RP BLEWITT, G (reprint author), JET PROP LAB,PASADENA,CA 91109, USA. NR 17 TC 47 Z9 49 U1 1 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 JAN 28 PY 1993 VL 361 IS 6410 BP 340 EP 342 DI 10.1038/361340a0 PG 3 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA KJ590 UT WOS:A1993KJ59000052 ER PT J AU KNOX, L TURNER, MS AF KNOX, L TURNER, MS TI INFLATION AT THE ELECTROWEAK SCALE SO PHYSICAL REVIEW LETTERS LA English DT Article ID MAGNETIC MONOPOLES; CHAOTIC INFLATION; SYMMETRY-BREAKING; UNIVERSE; BARYOGENESIS; COSMOLOGY; FLATNESS; HORIZON; ORIGIN; MODEL AB We present a model for slow-rollover inflation where the vacuum energy that drives inflation is of the order of G(F)-2; unlike most models, the conversion of vacuum energy to radiation (''reheating'') is moderately efficient. The scalar field responsible for inflation is a standard-model singlet, develops a vacuum expectation value of 4 x 10(6) GeV, has a mass of about 1 GeV, and can play a role in electroweak phenomena. We also discuss models where the energy scale of inflation is somewhat larger, but still well below the unification scale. C1 FERMILAB NATL ACCELERATOR LAB,NASA,FERMILAB ASTROPHYS CTR,FERMI NATL ACCELERATOR LAB,BATAVIA,IL 60510. UNIV CHICAGO,ENRICO FERMI INST,DEPT ASTRON & ASTROPHYS,CHICAGO,IL 60637. RP KNOX, L (reprint author), UNIV CHICAGO,DEPT PHYS,CHICAGO,IL 60637, USA. NR 38 TC 49 Z9 49 U1 0 U2 1 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0031-9007 J9 PHYS REV LETT JI Phys. Rev. Lett. PD JAN 25 PY 1993 VL 70 IS 4 BP 371 EP 374 DI 10.1103/PhysRevLett.70.371 PG 4 WC Physics, Multidisciplinary SC Physics GA KH615 UT WOS:A1993KH61500003 ER PT J AU SINGH, HB KANAKIDOU, M AF SINGH, HB KANAKIDOU, M TI AN INVESTIGATION OF THE ATMOSPHERIC SOURCES AND SINKS OF METHYL-BROMIDE SO GEOPHYSICAL RESEARCH LETTERS LA English DT Article ID AIR; HALOCARBONS; HALIDES; OZONE; SEA AB Methyl Bromide (CH3Br) is a ubiquitous component of the atmosphere and has been implicated as an important player in the depletion of stratospheric ozone. Atmospheric CH3Br abundances, interhemispheric gradients, oceanic concentrations, man-made emissions, and removal processes have been analyzed and interpreted with the help of a simple box model and a 2-D global photochemical model. Its calculated atmospheric lifetime (T) of 1.7-1.9 years, based on reaction with OH radicals, is consistent with a global source of 90-110 Gg (10(9)g)/year. Consequences of a much shorter lifetime of 1.2 years, due to possible deposition/hydrolysis losses, are also considered. Available data are used to estimate a CH3Br source that is 35% (20-50%) man-made and 65% (80-50%) natural. Oceans are substantially supersaturated and provide the most important natural source of almost-equal-to 60 (40-80) Gg/year. Within the oceans 200-300 Gg/year of CH3Br may be produced. Indirect emissions from automobile exhaust and biomass burning can not be well quantified (1-10 Gg/year). A global trend of 0.1-0.2 ppt/year is predicted. Model results show significant vertical and seasonal variations in the atmospheric abundances and interhemispheric gradients of CH3Br. Substantial uncertainties in calibrations, source estimates, and deposition processes are present. C1 CTR FAIBLES RADIOACT,CNRS,F-91198 GIF SUR YVETTE,FRANCE. RP SINGH, HB (reprint author), NASA,AMES RES CTR,MAIL STOP 245-5,MOFFETT FIELD,CA 94035, USA. RI Kanakidou, Maria/D-7882-2012 OI Kanakidou, Maria/0000-0002-1724-9692 NR 28 TC 78 Z9 78 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 JAN 22 PY 1993 VL 20 IS 2 BP 133 EP 136 DI 10.1029/92GL02634 PG 4 WC Geosciences, Multidisciplinary SC Geology GA KK361 UT WOS:A1993KK36100014 ER PT J AU KALLMAN, TR WILKES, BJ KROLIK, JH GREEN, R AF KALLMAN, TR WILKES, BJ KROLIK, JH GREEN, R TI CONSISTENCY OF SPHERICAL, GRAVITY-DOMINATED DYNAMICS WITH QUASAR HIGH-IONIZATION EMISSION-LINE PROFILES SO ASTROPHYSICAL JOURNAL LA English DT Article DE QUASARS, EMISSION LINES ID ACTIVE GALACTIC NUCLEI; HIGH-REDSHIFT QSOS; STELLAR OBJECTS; SEYFERT-GALAXIES; REGIONS; CLOUDS; SPECTRA; ACCRETION; GAS; SPECTROPHOTOMETRY AB Active galactic nucleus (AGN) emission-line profiles contain much information about the kinematics of the emission-line region. However, despite the large existing spectral data base, relatively little has been one to exploit this potential source of information fully because all existing analytic methods are strongly model-dependent and often involve large numbers of free parameters. In this paper we use line profile data to test a simple kinematic model-spherically symmetric gravitational free fall-in which we limit the number of free parameters by requiring physical self-consistency. The predictions of this model are fitted to high-resolution (1 angstrom) spectra of the stronger rest-frame ultraviolet emission lines in 12 quasars with z congruent-to 2. We find that if all the lines are radiated predominantly from the illuminated faces of the emission-line clouds, the profiles of Lyalpha, N V lambda1240, and C IV lambda1549 can be simultaneously well fitted with very similar parameters for all 12 quasars. However, three points cast doubt on whether this model actually describes the broad emission line regions of these quasars: in some cases, there are no parameter choices which lead to acceptable fits if C III] lambda1909 is added to the fist of predicted fine profiles; the best-fit parameters found for the fits to Lyalpha, N V lambda1240, and C IV lambda1549 are likely not to permit acceptable fits to other lines, once comparable profile data for them become available; finally, our results imply gravitational masses comparable to the most massive known galaxies, together with accretion rates which are likely to exceed known supply mechanisms. We therefore believe that spherically symmetric gravitational free fall does not correctly describe the dynamics of quasar broad emission line regions. Similar efforts applied to other dynamical scenario are likely to result in similarly severe constraints. C1 HARVARD SMITHSONIAN CTR ASTROPHYS,CAMBRIDGE,MA 02138. JOHNS HOPKINS UNIV,DEPT PHYS & ASTRON,BALTIMORE,MD 21218. NATL OPT ASTRON OBSERV,KITT PEAK NATL OBSERV,TUCSON,AZ 85726. RP KALLMAN, TR (reprint author), NASA,GODDARD SPACE FLIGHT CTR,HIGH ENERGY ASTROPHYS LAB,CODE 665,GREENBELT,MD 20771, USA. OI Wilkes, Belinda/0000-0003-1809-2364 NR 51 TC 18 Z9 18 U1 0 U2 0 PU UNIV CHICAGO PRESS PI CHICAGO PA 5720 S WOODLAWN AVE, CHICAGO, IL 60637 SN 0004-637X J9 ASTROPHYS J JI Astrophys. J. PD JAN 20 PY 1993 VL 403 IS 1 BP 45 EP 64 DI 10.1086/172182 PN 1 PG 20 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA KG277 UT WOS:A1993KG27700008 ER PT J AU DAY, CSR STEVENS, IR AF DAY, CSR STEVENS, IR TI AN X-RAY EXCITED WIND IN CENTAURUS X-3 SO ASTROPHYSICAL JOURNAL LA English DT Article DE BINARIES, CLOSE; PULSAR, GENERAL; STARS, INDIVIDUAL (CENTAURUS X-3); STARS, MASS LOSS; X-RAYS, STARS ID ILLUMINATED STELLAR WINDS; HIGH-STATE ECLIPSE; MILLISECOND PULSAR; BINARY-SYSTEMS; MASS-TRANSFER; ACCRETION; MODELS; EVOLUTION; STREAMS; STARS AB We propose a new interpretation of the behavior of the notable X-ray binary source Centaurus X-3. Based on both theoretical and observational arguments (using EXOSAT data), we suggest that an X-ray excited wind emanating from the O star is present in this system. Further, we suggest that this wind is responsible for the mass transfer in the system rather than Roche-lobe overflow or a normal radiatively driven stellar wind. We show that the ionization conditions in Cen X-3 are too extreme to permit a normal radiatively driven wind to emanate from portions of the stellar surface facing toward the neutron star. In addition, the flux of X-rays from the neutron star is strong enough to drive a thermal wind from the O star with sufficient mass-flux to power the X-ray source. We find that this model can reasonably account for the long duration of the eclipse transitions and other observed features of Cen X-3. If confirmed, this will be the first example of an X-ray excited wind in a massive binary. We also discuss the relationship between the excited wind in Cen X-3 to the situation in eclipsing millisecond pulsars, where an excited wind is also believed to be present. C1 UNIV CAMBRIDGE,INST ASTRON,CAMBRIDGE CB3 0HA,ENGLAND. RP DAY, CSR (reprint author), NASA,GODDARD SPACE FLIGHT CTR,HIGH ENERGY ASTROPHYS LAB,GREENBELT,MD 20771, USA. NR 48 TC 26 Z9 26 U1 0 U2 0 PU UNIV CHICAGO PRESS PI CHICAGO PA 5720 S WOODLAWN AVE, CHICAGO, IL 60637 SN 0004-637X J9 ASTROPHYS J JI Astrophys. J. PD JAN 20 PY 1993 VL 403 IS 1 BP 322 EP 331 DI 10.1086/172205 PN 1 PG 10 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA KG277 UT WOS:A1993KG27700031 ER PT J AU CHAKRABARTY, D GRUNSFELD, JM PRINCE, TA BILDSTEN, L FINGER, MH WILSON, RB FISHMAN, GJ MEEGAN, CA PACIESAS, WS AF CHAKRABARTY, D GRUNSFELD, JM PRINCE, TA BILDSTEN, L FINGER, MH WILSON, RB FISHMAN, GJ MEEGAN, CA PACIESAS, WS TI DISCOVERY OF THE ORBIT OF THE X-RAY PULSAR OAO 1657-415 SO ASTROPHYSICAL JOURNAL LA English DT Article DE BINARIES, CLOSE; BINARIES, ECLIPSING; PULSARS, INDIVIDUAL, OAO-1657; 415; STARS, NEUTRON; X-RAYS, STARS ID OAO-1657-415; ENERGY; TESTS AB Timing observations of the 38 s accreting X-ray pulsar OAO 1657-415 made with the BATSE large-area detectors on the Compton Gamma Ray Observatory have revealed a binary orbit with an X-ray eclipse by the stellar companion. Arrival time analysis of 20-60 keV data yielded the following best-fit orbital elements: P(orb) = 10.4436d +/- 0.0038d, a(x) sin i = 106.0 +/- 0.5 It-sec, e = 0.104 +/- 0.005, omega = 93-degrees + 5-degrees, T(pi/2) = JD 2,448,516.49 +/- 0.05 TDB. From the pulsar mass function f(x)(M) = 11.7 +/- 0.2 M. and the measured eclipse half-angle theta(e) = 29.7-degrees +/- 1.3-degrees, we infer that the stellar companion is a supergiant of spectral class BO-B6. If the companion can be identified and its orbital velocity measured, the neutron star mass can be constrained. Both intrinsic spin-up (P/P almost-equal-to -8 x 10(-3) yr-1) and spin-down (P/P almost-equal-to 2 x 10(-3) yr-1) of the pulsar were measured during our observation. C1 NASA,GEORGE C MARSHALL SPACE FLIGHT CTR,SPACE SCI LAB,HUNTSVILLE,AL 35812. UNIV ALABAMA,DEPT PHYS,HUNTSVILLE,AL 35809. RP CHAKRABARTY, D (reprint author), CALTECH,DIV PHYS MATH & ASTRON,PASADENA,CA 91125, USA. NR 24 TC 52 Z9 52 U1 0 U2 0 PU UNIV CHICAGO PRESS PI CHICAGO PA 5720 S WOODLAWN AVE, CHICAGO, IL 60637 SN 0004-637X J9 ASTROPHYS J JI Astrophys. J. PD JAN 20 PY 1993 VL 403 IS 1 BP L33 EP L37 DI 10.1086/186715 PN 2 PG 5 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA KG282 UT WOS:A1993KG28200009 ER PT J AU GELB, JM GRADWOHL, BA FRIEMAN, JA AF GELB, JM GRADWOHL, BA FRIEMAN, JA TI LARGE-SCALE AND SMALL-SCALE CONSTRAINTS ON POWER SPECTRA IN OMEGA=1 UNIVERSES SO ASTROPHYSICAL JOURNAL LA English DT Article DE DARK MATTER; GALAXIES, FORMATION ID COLD DARK MATTER; VELOCITY; GALAXIES; DENSITY AB The cold dark matter (CDM) model of structure formation, normalized on large scales, leads to excessive pairwise velocity dispersions on small scales. In an attempt to circumvent this problem, we study three scenarios (all with OMEGA = 1) with more large-scale and less small-scale power than the standard CDM model: (1) cold dark matter with significantly reduced small-scale power (inspired by models with an admixture of cold and hot dark matter); (2) cold dark matter with a non-scale-invariant power spectrum; and (3) cold dark matter with coupling of dark matter to a long-range vector field. Despite the reduced small-scale power, when such models are evolved to large amplitude, the velocities on small scales are actually increased over CDM with the same value of sigma8. This ''flip-over,'' in disagreement with the expectation from linear perturbation theory, arises from the nonlinear coupling of the extra power on large scales with shorter wavelengths. However, the recent COBE DMR results indicate smaller amplitudes for these models, sigma8 approximately 0.5-0.7, than for CDM (for which sigma8 approximately 1.2). Therefore, when normalized to COBE on large scales, such models do lead to reduced velocities on small scales and they produce fewer halos compared with CDM. However, models with sufficiently low small-scale velocities apparently fail to produce an adequate number of halos. RP GELB, JM (reprint author), NASA,FERMILAB ASTROPHYS CTR,FERMI NATL ACCELERATOR LAB,POB 500,BATAVIA,IL 60510, USA. NR 24 TC 25 Z9 25 U1 0 U2 0 PU UNIV CHICAGO PRESS PI CHICAGO PA 5720 S WOODLAWN AVE, CHICAGO, IL 60637 SN 0004-637X J9 ASTROPHYS J JI Astrophys. J. PD JAN 20 PY 1993 VL 403 IS 1 BP L5 EP L8 DI 10.1086/186708 PN 2 PG 4 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA KG282 UT WOS:A1993KG28200002 ER PT J AU SNYDER, LE KUAN, YJ ZIURYS, LM HOLLIS, JM AF SNYDER, LE KUAN, YJ ZIURYS, LM HOLLIS, JM TI NEW 3 MILLIMETER OBSERVATIONS OF INTERSTELLAR HNO - REINSTATING A DISCREDITED IDENTIFICATION SO ASTROPHYSICAL JOURNAL LA English DT Article DE ISM, ABUNDANCES; ISM, CLOUDS; ISM, H II REGIONS; ISM, MOLECULES; STARS, CARBON ID MOLECULAR LINE SURVEY; IRC + 10216; NITRIC-OXIDE; ORION; GHZ; SAGITTARIUS-B2; CLOUDS AB HNO has been observed in six interstellar clouds via its 1(01)-0(00) transition at 3 mm wavelength. L134N, W33A, W51M, and DR 21 are new HNO sources. The excellent agreement between laboratory and astronomical rest frequency in L134N is important for establishing the correctness of the astronomical assignment of this line. With the exception of Ori A, every known NO source contains detectable HNO. The typical column density ratio N(tot)(NO)/N(tot)(HNO) appears to be 100-200, except for L134N (approximately 800) and DR 21(OH) (approximately 20). These new HNO results correct several misconceptions in the current literature. C1 ARIZONA STATE UNIV,DEPT CHEM,TEMPE,AZ 85287. NASA,GODDARD SPACE FLIGHT CTR,DIV SPACE DATA & COMP,GREENBELT,MD 20771. RP SNYDER, LE (reprint author), UNIV ILLINOIS,DEPT ASTRON,1002 W GREEN ST,URBANA,IL 61801, USA. NR 25 TC 7 Z9 7 U1 0 U2 0 PU UNIV CHICAGO PRESS PI CHICAGO PA 5720 S WOODLAWN AVE, CHICAGO, IL 60637 SN 0004-637X J9 ASTROPHYS J JI Astrophys. J. PD JAN 20 PY 1993 VL 403 IS 1 BP L17 EP L20 DI 10.1086/186711 PN 2 PG 4 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA KG282 UT WOS:A1993KG28200005 ER PT J AU RIGNOT, E KWOK, R AF RIGNOT, E KWOK, R TI CHARACTERIZATION OF SPATIAL STATISTICS OF DISTRIBUTED TARGETS IN SAR DATA SO INTERNATIONAL JOURNAL OF REMOTE SENSING LA English DT Article ID SYNTHETIC-APERTURE-RADAR; IMAGES; SPECTRA; CLUTTER; MODEL; NOISE AB A method for the analysis of spatial statistics in multifrequency polarimetric Synthetic Aperture Radar (SAR) data is presented. The objective is to extract the intrinsic variability of the target by removing the variability from other sources. Three sources which contribute to the spatial variability in the returned power from a distributed target are modelled, they are (1) image speckle, (2) system noise, and (3) the intrinsic spatial variability of the target or texture. Speckle and system noise are modelled based on an understanding of the physics of the SAR imaging and processing systems. Texture is modelled as a random variable which modulates the mean returned power from a distributed target. An image model which accounts for all three sources of variability is presented. The presence of texture is shown to increase the image variance-to-mean square ratio and to introduce deviations of the image autocovariance function from the expected SAR system response. Two textural parameters, the standard deviation of texture and its autocovariance coefficient, are examined This statistical approach is illustrated using sea-ice SAR imagery acquired by the Jet Propulsion Laboratory three-frequency polarimetric airborne SAR. TeXtural modulation of the signal has been detected in the imagery. Results show that for different sea-ice types the spatial statistics seem to vary more across frequency than across polarization and the observed differences increase in magnitude with decreasing frequency. The results also suggest the potential of this approach for discrimination of various sea-ice types and open water in single frequency. single polarization SAR data. Correlation of the spatial statistics to field measurements will be important for the verification of these observations. RP RIGNOT, E (reprint author), JET PROP LAB,MAIL STOP 300-235,4800 OAK GROVE DR,PASADENA,CA 91109, USA. RI Kwok, Ron/A-9762-2008; Rignot, Eric/A-4560-2014 OI Kwok, Ron/0000-0003-4051-5896; Rignot, Eric/0000-0002-3366-0481 NR 24 TC 27 Z9 27 U1 1 U2 2 PU TAYLOR & FRANCIS LTD PI LONDON PA ONE GUNDPOWDER SQUARE, LONDON, ENGLAND EC4A 3DE SN 0143-1161 J9 INT J REMOTE SENS JI Int. J. Remote Sens. PD JAN 20 PY 1993 VL 14 IS 2 BP 345 EP 363 PG 19 WC Remote Sensing; Imaging Science & Photographic Technology SC Remote Sensing; Imaging Science & Photographic Technology GA KL653 UT WOS:A1993KL65300011 ER PT J AU ELUSZKIEWICZ, J ALLEN, M AF ELUSZKIEWICZ, J ALLEN, M TI A GLOBAL ANALYSIS OF THE OZONE DEFICIT IN THE UPPER-STRATOSPHERE AND LOWER MESOSPHERE SO JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES LA English DT Article ID LIMB INFRARED MONITOR; NONLOCAL THERMODYNAMIC-EQUILIBRIUM; SPECTROSCOPY ATMOS MEASUREMENTS; LOWER THERMOSPHERE; RADIATIVE-TRANSFER; NITROGEN-DIOXIDE; NIMBUS-7 DATA; ODD NITROGEN; V3 MODE; PHOTOCHEMISTRY AB The global measurements of temperature, ozone, water vapor, and nitrogen dioxide acquired by the Limb Infrared Monitor of the Stratosphere (LIMS), supplemented by a precomputed distribution of chlorine monoxide, are used to test the balance between odd oxygen production and loss in the upper stratosphere and lower mesosphere. An efficient photochemical equilibrium model, whose validity is ascertained by comparison with the results from a fully time-dependent one-dimensional model at selected latitudes, is used in the calculations. The computed ozone abundances are systematically lower than observations for May 1-7, 1979, which suggests, contrary to the conclusions of other recent studies, a real problem in model simulations of stratospheric ozone. The ''ozone deficit'' at 30-degrees-N is smaller than previous analyses of LIMS data have indicated. In the stratosphere, this reduction in the deficit is due to the fact that ClO abundances for the 1979 period utilized in this study are much lower than in earlier work, mainly as a result of lower Cl(y) concentrations. In the mesosphere, a correlation of the ozone deficit with the distribution of water vapor is indicated. The ozone deficit in the stratosphere can be eliminated by modifying only one model reaction rate: either by decreasing the rate of odd oxygen loss (e.g., by decreasing the abundances of atomic oxygen through an increase in the rate of the reaction O + O2 + M --> O3 + M within the recommended uncertainties) or by increasing the rate of odd oxygen production (by increasing the photodissociation rate of molecular oxygen primarily in the Herzberg continuum and/or invoking photolysis of vibrationally excited molecular oxygen). With the ozone abundances thus increased, a small residual deficit in the lower mesophere can be eliminated by reducing, within the recommended kinetic uncertainties, the efficiency of odd hydrogen-catalyzed odd oxygen loss. With the adjusted model, the calculated ozone abundances for the week of January 1-7, 1979, outside of winter latitudes, also agree with the LIMS observations to within 10%. C1 JET PROP LAB,DIV EARTH & SPACE SCI,PASADENA,CA 91109. RP ELUSZKIEWICZ, J (reprint author), CALTECH,DIV GEOL & PLANETARY SCI,PASADENA,CA 91125, USA. NR 50 TC 84 Z9 84 U1 0 U2 4 PU AMER GEOPHYSICAL UNION PI WASHINGTON PA 2000 FLORIDA AVE NW, WASHINGTON, DC 20009 SN 0148-0227 J9 J GEOPHYS RES-ATMOS JI J. Geophys. Res.-Atmos. PD JAN 20 PY 1993 VL 98 IS D1 BP 1069 EP 1082 DI 10.1029/92JD01912 PG 14 WC Meteorology & Atmospheric Sciences SC Meteorology & Atmospheric Sciences GA KJ594 UT WOS:A1993KJ59400008 ER PT J AU DAVIDSON, MR HOFLUND, GB OUTLAW, RA AF DAVIDSON, MR HOFLUND, GB OUTLAW, RA TI ELECTRON-STIMULATED DESORPTION OF OXYGEN-ATOMS AND IONS FROM AN OXIDIZED AG-ZR ALLOY SURFACE SO SURFACE SCIENCE LA English DT Article ID TUNGSTEN 110 SURFACE; POLYCRYSTALLINE ZIRCONIUM; SCATTERING SPECTROSCOPY; KR AB Electron stimulated desorption (ESD) is a complex process in which the ion and neutral yields are functions of many variables. In order to examine some of these dependencies which have not been considered previously, a study of the composition and ESD behavior of a Ag/0.5wt%Zr (Ag 0.5 Zr) alloy membrane has been conducted. Zr was added to the Ag primarily to increase the O concentration at the surface and thereby enhance the ESD signal. The surface was sputter cleaned, saturated with O2, sputter cleaned again and then annealed at 250-degrees-C until no further changes occurred in the surface composition according to ion scattering spectroscopy (ISS) and Auger electron spectroscopy (AES). ISS data suggest that the resulting surface consists of islands of Zr oxide partially covering the Ag surface. Neutrals emitted in ESD are quite difficult to detect so a technique was developed to determine the 0 neutral-to-ion ratio of 1.1 X 10(7) for a primary beam energy of 1 keV. By monitoring the surface O concentration as a function of time with AES, a total ESD cross section of 3.9 x 10(-19) cm2 was determined. The ESD O+ energy distribution spectrum was obtained and compared with that obtained from O-charged Ag. Also, the effect of primary beam incidence angle on the ESD yield and ion energy distribution was examined and found to be significant. C1 NASA,LANGLEY RES CTR,HAMPTON,VA 23665. RP DAVIDSON, MR (reprint author), UNIV FLORIDA,DEPT CHEM ENGN,GAINESVILLE,FL 32611, USA. RI Davidson, Mark/C-1135-2009 NR 23 TC 13 Z9 13 U1 0 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0039-6028 J9 SURF SCI JI Surf. Sci. PD JAN 20 PY 1993 VL 281 IS 1-2 BP 111 EP 119 DI 10.1016/0039-6028(93)90860-M PG 9 WC Chemistry, Physical; Physics, Condensed Matter SC Chemistry; Physics GA KH844 UT WOS:A1993KH84400018 ER PT J AU SMITH, GD JAFFE, RL YOON, DY AF SMITH, GD JAFFE, RL YOON, DY TI CONFORMATIONS AND ORDER IN ATACTIC POLY(VINYL CHLORIDE) MELTS FROM MOLECULAR-DYNAMICS SIMULATIONS SO MACROMOLECULES LA English DT Article ID BULK AMORPHOUS POLYMERS; LOCAL CHAIN MOTION; GLASS-TRANSITION; LIQUID AB Molecular dynamics simulations of atactic poly(vinyl chloride) (PVC) melts at 450 and 600 K were performed including individual hydrogens and utilizing an ab initio quantum chemistry based force field. Electrostatic interactions were considered by employing partial atomic charges with a distance-dependent dielectric constant. The effects of polar electrostatic interactions and packing on chain conformations and intermolecular orientational correlations were examined individually by performing additional simulations of isolated chains and melts without intermolecular Coulombic interactions. Pair distribution functions show strong temperature dependence but are relatively insensitive to electrostatic interactions. Reasonably good agreement between calculated and experimental X-ray scattering profiles is found for PVC melts at 450 K. Chain conformations in PVC melts are found to be extended relative to the conformations of isolated chains. Moreover, significant temperature-dependent orientational order is seen in PVC melts, with highly parallel chain segments being distributed in small localized clusters. These deviations from the unperturbed chain model are attributable to the presence of polar intermolecular interactions in PVC melts. C1 IBM CORP,ALMADEN RES CTR,650 HARRY RD,SAN JOSE,CA 95120. ELORET INST,SUNNYVALE,CA 94087. NASA,AMES RES CTR,MOFFETT FIELD,CA 94035. NR 37 TC 69 Z9 69 U1 2 U2 9 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0024-9297 J9 MACROMOLECULES JI Macromolecules PD JAN 18 PY 1993 VL 26 IS 2 BP 298 EP 304 DI 10.1021/ma00054a008 PG 7 WC Polymer Science SC Polymer Science GA KH579 UT WOS:A1993KH57900008 ER PT J AU ABDULAZIZ, A AUGUST, R NAGPAL, V AF ABDULAZIZ, A AUGUST, R NAGPAL, V TI DESIGN CONSIDERATIONS FOR A SPACE-SHUTTLE MAIN ENGINE TURBINE BLADE MADE OF SINGLE-CRYSTAL MATERIAL SO COMPUTERS & STRUCTURES LA English DT Article AB Nonlinear finite-element structural analyses were performed on the first stage high pressure fuel turbopump blade of the space shuttle main engine (SSME). These analyses examined the structural response and the dynamic characteristics at typical operating conditions. Single crystal material PWA-1480 was considered for the analyses. Structural response and the blade natural frequencies with respect to the crystal orientation were investigated. The analyses were conducted based on typical test stand engine cycle. Influence of combined thermal, aerodynamic and centrifugal loadings was considered. Results obtained showed that the single crystal secondary orientation effects on the maximum principal stresses are not highly significant. Campbell diagrams were constructed and natural frequencies as a function of crystal orientation were plotted. RP ABDULAZIZ, A (reprint author), NASA,LEWIS RES CTR GRP,SVERDRUP TECHNOLOGY INC,CLEVELAND,OH 44135, USA. NR 9 TC 3 Z9 3 U1 0 U2 1 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0045-7949 J9 COMPUT STRUCT JI Comput. Struct. PD JAN 17 PY 1993 VL 46 IS 2 BP 249 EP 259 DI 10.1016/0045-7949(93)90190-O PG 11 WC Computer Science, Interdisciplinary Applications; Engineering, Civil SC Computer Science; Engineering GA KH791 UT WOS:A1993KH79100006 ER PT J AU BRAVE, Y HEYMANN, M AF BRAVE, Y HEYMANN, M TI ON OPTIMAL ATTRACTION IN DISCRETE-EVENT PROCESSES SO INFORMATION SCIENCES LA English DT Article ID SUPERVISORY CONTROL; SYSTEMS AB The concept of attraction has been shown to play a basic role in the synthesis of supervisors for stabilizing discrete-event processes. In this paper we define and investigate optimal attraction.in the sense that the cost (or distance) of the convergent path is minimized with respect to some distance measure. We find conditions for the existence of supervisors achieving optimal attraction and provide efficient algorithms for their synthesis. C1 NASA,AMES RES CTR,MOFFETT FIELD,CA 94035. TECHNION ISRAEL INST TECHNOL,DEPT ELECT ENGN,IL-32000 HAIFA,ISRAEL. TECHNION ISRAEL INST TECHNOL,DEPT COMP SCI,IL-32000 HAIFA,ISRAEL. NR 8 TC 35 Z9 35 U1 0 U2 0 PU ELSEVIER SCIENCE INC PI NEW YORK PA 655 AVENUE OF THE AMERICAS, NEW YORK, NY 10010 SN 0020-0255 J9 INFORM SCIENCES JI Inf. Sci. PD JAN 15 PY 1993 VL 67 IS 3 BP 245 EP 276 DI 10.1016/0020-0255(93)90075-W PG 32 WC Computer Science, Information Systems SC Computer Science GA KE122 UT WOS:A1993KE12200004 ER PT J AU DICKEY, T GRANATA, T MARRA, J LANGDON, C WIGGERT, J CHAIJOCHNER, Z HAMILTON, M VAZQUEZ, J STRAMSKA, M BIDIGARE, R SIEGEL, D AF DICKEY, T GRANATA, T MARRA, J LANGDON, C WIGGERT, J CHAIJOCHNER, Z HAMILTON, M VAZQUEZ, J STRAMSKA, M BIDIGARE, R SIEGEL, D TI SEASONAL VARIABILITY OF BIOOPTICAL AND PHYSICAL-PROPERTIES IN THE SARGASSO SEA SO JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS LA English DT Article ID GROWTH IRRADIANCE RELATIONSHIP; UPPER-OCEAN; NORTH-ATLANTIC; GULF-STREAM; INTERSPECIFIC DIFFERENCES; CHLOROPHYLL-A; SPACE SCALES; TIME-SERIES; PHYTOPLANKTON; PHOTOSYNTHESIS AB The seasonal variability of bio-optical and physical properties within the upper ocean at a site in the Sargasso Sea (34-degrees-N, 70-degrees-W) has been observed using multivariable moored systems (MVMS) during a 9-month period (March through November 1987). In addition, complementary meteorological data, sea surface height (Geosat) and sea surface temperature maps, and expendable bathythermograph (XBT) and shipboard profile data (physical and bio-optical) have been utilized for interpretation. The observations during March are characteristic of late wintertime conditions of a deep isothermal layer (approximately 18-19-degrees-C), but with intervening periods of warming due to the advection of warm outbreak waters associated with Gulf Stream meanders. The mixed layer depth shoals from greater than 160 m to about 25 m in late March (spring transition). Phytoplankton blooms follow the mixed layer shoaling. A succession of phytoplankton populations occurs during this transitional interval. Mesoscale variability associated with cold core rings and warm outbreak waters associated with the Gulf Stream are evident at various times. The mixed layer remains near 25 m for the summer and deepens in mid-September. A relatively intense subsurface maximum in chlorophyll develops at approximately 75 m following the spring transition. The maximum persists, but weakens in mid-summer. The present study clearly indicates that important processes associated with, and contributing to the seasonal cycle occur on short time and space scales and that integrated data sets obtained from moorings, ships, and satellites can be used to effectively study bio-optical and physical phenomena on tome scales from minutes to seasons. C1 COLUMBIA UNIV,LAMONT DOHERTY GEOL OBSERV,PALISADES,NY 10964. JET PROP LAB,PASADENA,CA 91109. UNIV HAWAII,DEPT OCEANOG,HONOLULU,HI 96882. UNIV CALIF SANTA BARBARA,CTR REMOTE SENSING & ENVIRONM OPT,SANTA BARBARA,CA 93106. RP DICKEY, T (reprint author), UNIV SO CALIF,DEPT GEOL SCI,OCEAN PHYS GRP,LOS ANGELES,CA 90089, USA. RI Siegel, David/C-5587-2008 NR 88 TC 50 Z9 50 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 JAN 15 PY 1993 VL 98 IS C1 BP 865 EP 898 DI 10.1029/92JC01830 PG 34 WC Oceanography SC Oceanography GA KG675 UT WOS:A1993KG67500003 ER PT J AU BRENNER, AC KOBLINSKY, CJ ZWALLY, HJ AF BRENNER, AC KOBLINSKY, CJ ZWALLY, HJ TI POSTPROCESSING OF SATELLITE ALTIMETRY RETURN SIGNALS FOR IMPROVED SEA-SURFACE TOPOGRAPHY ACCURACY SO JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS LA English DT Article ID STATE BIAS; GEOSAT ALTIMETER; WAVE HEIGHT; OCEAN TIDES AB Large off-nadir attitude deviations and high surface wave heights cause an alteration in the ocean return signal from a satellite radar altimeter. This leads to an error in the on-board calculation of the height measurement. The error can be removed by reprocessing the full radar return signal on the ground. In the ground processing, the correct tracking point in the return signal is recomputed through a procedure called retracking. There has been a controversy over whether or not all altimeter data would be retracked. This study analyzes retracked southern ocean data from the first 34 repeat cycles of the Geosat Exact Repeat Mission (ERM), covering November 1986 through April 1988. The final data set consists of over 2.5 million smoothed one-per-second measurements of the ocean surface. The significant wave height (SWH) distribution as given on the NOAA geophysical data records (GDRs) for these measurements peaks at around 2.1 m (19% of the measurements) and drops down almost linearly to 2% of the measurements at 5.8 m. There are over 1100 observations with SWH greater than 15 m. The difference between the surface heights calculated from the retracked data and the original on-board estimates is less than 10 cm for SWH less than 10 m but increases to approximately 1.0 m at a SWH of 18 m. In general, the electromagnetic (EM) bias coefficient calculated using the retracked data is slightly less than that using the unretracked data and does not decrease as much with SWH as do the EM bias coefficients calculated from the unretracked data. A map of the sea surface height variability of the southern ocean created using the retracked data shows differences from variability maps created using the unretracked data in regions of high wave heights. Retracking can be done efficiently on modern UNIX work stations at 0.064 times real-time acquisition. This study shows that retracking will improve altimeter precision. C1 NASA,GODDARD SPACE FLIGHT CTR,OCEANS & ICE BRANCH,GREENBELT,MD 20771. RP BRENNER, AC (reprint author), HUGHES STX CORP,4400 FORBES BLVD,LANHAM,MD 20706, USA. NR 19 TC 10 Z9 11 U1 0 U2 1 PU AMER GEOPHYSICAL UNION PI WASHINGTON PA 2000 FLORIDA AVE NW, WASHINGTON, DC 20009 SN 0148-0227 J9 J GEOPHYS RES-OCEANS JI J. Geophys. Res.-Oceans PD JAN 15 PY 1993 VL 98 IS C1 BP 933 EP 944 DI 10.1029/92JC02271 PG 12 WC Oceanography SC Oceanography GA KG675 UT WOS:A1993KG67500007 ER PT J AU BROCK, JC MCCLAIN, CR AF BROCK, JC MCCLAIN, CR TI A NOTE ON THE POSSIBLE CONNECTION BETWEEN THE EL-CHICHON ERUPTION AND OCEAN PRODUCTION IN THE NORTHWEST ARABIAN SEA DURING 1982 - COMMENT SO JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS LA English DT Note C1 FISHERIES & OCEANS CANADA,BEDFORD INST OCEANOG,DARTMOUTH B2Y 4A2,NS,CANADA. NASA,GODDARD SPACE FLIGHT CTR,OCEANS & ICE BRANCH,GREENBELT,MD 20771. NR 7 TC 1 Z9 1 U1 0 U2 1 PU AMER GEOPHYSICAL UNION PI WASHINGTON PA 2000 FLORIDA AVE NW, WASHINGTON, DC 20009 SN 0148-0227 J9 J GEOPHYS RES-OCEANS JI J. Geophys. Res.-Oceans PD JAN 15 PY 1993 VL 98 IS C1 BP 989 EP 989 DI 10.1029/93JC02444 PG 1 WC Oceanography SC Oceanography GA KG675 UT WOS:A1993KG67500013 ER PT J AU CHOI, SR SALEM, JA AF CHOI, SR SALEM, JA TI INTERACTION OF CRACKS BETWEEN 2 ADJACENT INDENTS IN GLASS SO JOURNAL OF MATERIALS SCIENCE LA English DT Article ID MEASURING FRACTURE-TOUGHNESS; STRENGTH; INDENTATIONS; DEFORMATION; FLAWS AB Experimental observations of the interaction behaviour of cracks between two adjacent indents were made using an indentation technique in soda-lime glass. It was specifically demonstrated how one indent crack initiates and propagates in the vicinity of another indent crack. Several types of crack interactions were examined by changing the orientation and distance of one indent relative to the other. It was found that the residual stress field produced by elastic/plastic indentation has a significant influence on controlling the mode of crack interaction. The interaction of an indent crack with a free surface was also investigated for glass and ceramic specimens. C1 NASA,LEWIS RES CTR,CLEVELAND,OH 44135. RP CHOI, SR (reprint author), CLEVELAND STATE UNIV,CLEVELAND,OH 44115, USA. NR 20 TC 7 Z9 7 U1 0 U2 0 PU CHAPMAN HALL LTD PI LONDON PA 2-6 BOUNDARY ROW, LONDON, ENGLAND SE1 8HN SN 0022-2461 J9 J MATER SCI JI J. Mater. Sci. PD JAN 15 PY 1993 VL 28 IS 2 BP 501 EP 505 DI 10.1007/BF00357830 PG 5 WC Materials Science, Multidisciplinary SC Materials Science GA KM823 UT WOS:A1993KM82300032 ER PT J AU HARSHVARDHAN KING, MD AF HARSHVARDHAN KING, MD TI COMPARATIVE ACCURACY OF DIFFUSE RADIATIVE PROPERTIES COMPUTED USING SELECTED MULTIPLE-SCATTERING APPROXIMATIONS SO JOURNAL OF THE ATMOSPHERIC SCIENCES LA English DT Article ID SOLAR-RADIATION; ATMOSPHERES; PARAMETERIZATION; ABSORPTION; CLIMATE; CLOUDS; AEROSOLS; ALBEDO; MODEL AB Computational results have been obtained for the spherical albedo, global transmission, and global absorption of plane-parallel layers composed of cloud droplets, These computations, obtained using the doubling method for the entire range of single scattering albedos (0 less-than-or-equal-to omega0 less-than-or-equal-to 1 ) and for optical depths between 0.1 and 100, are compared with corresponding results obtained using selected multiple scattering approximations. Both the relative and absolute accuracies of asymptotic theory for thick layers, three diffuse two-stream approximations, and two integrated two-stream approximations are presented as a function of optical thickness and single scattering albedo for a scattering phase function representative of cloud droplets at visible wavelengths. The spherical albedo and global absorption computed using asymptotic theory are found to be accurate to better than 5% for all values of the single scattering albedo, provided the optical thickness exceeds about 2. The diffuse two-stream approximations have relative accuracies that are much worse than 5% for the spherical albedo over most of the parameter space, yet are accurate to within 5% in the global absorption when the absorption is significant. The integrated delta-Eddington scheme appears to be the most suitable model over the entire range of variables, generally producing relative errors of less than 5% in both the spherical albedo and global absorption. C1 NASA, GODDARD SPACE FLIGHT CTR, ATMOSPHERES LAB, GREENBELT, MD 20771 USA. RP PURDUE UNIV, DEPT EARTH & ATMOSPHER SCI, 1397 CIVIL ENGN BLDG, W LAFAYETTE, IN 47907 USA. RI King, Michael/C-7153-2011 OI King, Michael/0000-0003-2645-7298 NR 32 TC 15 Z9 15 U1 1 U2 6 PU AMER METEOROLOGICAL SOC PI BOSTON PA 45 BEACON ST, BOSTON, MA 02108-3693 USA SN 0022-4928 EI 1520-0469 J9 J ATMOS SCI JI J. Atmos. Sci. PD JAN 15 PY 1993 VL 50 IS 2 BP 247 EP 259 DI 10.1175/1520-0469(1993)050<0247:CAODRP>2.0.CO;2 PG 13 WC Meteorology & Atmospheric Sciences SC Meteorology & Atmospheric Sciences GA KL111 UT WOS:A1993KL11100006 ER PT J AU DULEY, WW JONES, AP TAYLOR, SD WILLIAMS, DA AF DULEY, WW JONES, AP TAYLOR, SD WILLIAMS, DA TI INFRARED-EMISSION FROM HYDROGENATED AMORPHOUS-CARBON AND AMORPHOUS-CARBON GRAINS IN THE INTERSTELLAR-MEDIUM SO MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY LA English DT Article DE MOLECULAR PROCESSES; DUST, EXTINCTION; ISM, MOLECULES; INFRARED, INTERSTELLAR, CONTINUUM ID EXTINCTION; MOLECULES; DUST; SPECTROSCOPY; IRRADIATION; PARTICLES; SPECTRUM; MANTLES; CLOUDS AB The correlations deduced by Boulanger et al. from IRAS maps of the Chamaeleon, Taurus and Ursa Major molecular cloud complexes are interpreted in terms of the evolutionary HAC model of interstellar dust. In particular, regions of relatively strong 12-mum emission may be regions where recently accreted carbon is being converted by ambient UV to small PAHs in situ. Regions of weak 12-mum emission are probably quiescent regions where carbon has been annealed to amorphous carbon. Observational consequences of these inferences are briefly described. C1 NASA,AMES RES CTR,MOFFETT FIELD,CA 94035. UNIV MANCHESTER,INST SCI & TECHNOL,DEPT MATH,MANCHESTER M60 1QD,LANCS,ENGLAND. RP DULEY, WW (reprint author), UNIV WATERLOO,DEPT PHYS,WATERLOO N2L 3G1,ONTARIO,CANADA. NR 31 TC 6 Z9 6 U1 0 U2 4 PU BLACKWELL SCIENCE LTD PI OXFORD PA OSNEY MEAD, OXFORD, OXON, ENGLAND OX2 0EL SN 0035-8711 J9 MON NOT R ASTRON SOC JI Mon. Not. Roy. Astron. Soc. PD JAN 15 PY 1993 VL 260 IS 2 BP 415 EP 419 PG 5 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA KG945 UT WOS:A1993KG94500021 ER PT J AU KSENDZOV, A PIKE, WT LARSSON, A AF KSENDZOV, A PIKE, WT LARSSON, A TI INTERBAND OPTICAL-TRANSITIONS BETWEEN CONFINED AND UNCONFINED STATES IN QUANTUM-WELLS SO PHYSICAL REVIEW B LA English DT Article ID SUPERLATTICES; PHOTOLUMINESCENCE; GAAS-GA1-XALXAS AB We have measured and calculated the interband optical absorption in single quantum wells (SQW's) due to transitions between confined states and unconfined continuum states (C- U transitions), and compared it to absorption due to transitions involving pairs of confined states (C-C transitions). Our sample was an In0.25Ga0.75As/GaAs SQW with a 61-angstrom well width as determined by electron microscopy. The computed spectra and the results of polarization-modulated absorption measurements reveal steplike absorption features with gradual turnon due to C-U transitions, as opposed to the sharp steps corresponding to the C-C transitions. The transitions of both types have comparable strength, demonstrating the importance of the C-U transitions, which have been largely neglected in previous calculations of the optical properties of quantum wells. Unlike our SQW results, published absorption spectra of uncoupled multiple quantum wells show that C- U transitions produce steplike absorption features with sharp onset. We use a simple model to demonstrate how the slow-turnon absorption line shapes characteristic of SQW's evolve into sharp steplike features as more wells are added. RP KSENDZOV, A (reprint author), JET PROP LAB,CTR SPACE MICROELECTR,PASADENA,CA 91109, USA. RI Larsson, Anders/P-7275-2015 OI Larsson, Anders/0000-0002-0912-7695 NR 20 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 JAN 15 PY 1993 VL 47 IS 4 BP 2228 EP 2232 DI 10.1103/PhysRevB.47.2228 PG 5 WC Physics, Condensed Matter SC Physics GA KK584 UT WOS:A1993KK58400058 ER PT J AU ADAMS, FC BOND, JR FREESE, K FRIEMAN, JA OLINTO, AV AF ADAMS, FC BOND, JR FREESE, K FRIEMAN, JA OLINTO, AV TI NATURAL INFLATION - PARTICLE PHYSICS MODELS, POWER-LAW SPECTRA FOR LARGE-SCALE STRUCTURE, AND CONSTRAINTS FROM THE COSMIC BACKGROUND EXPLORER SO PHYSICAL REVIEW D LA English DT Article ID PSEUDO-GOLDSTONE BOSONS; BROKEN-SYMMETRIC THEORY; APM GALAXY SURVEY; COLD DARK MATTER; EXTENDED INFLATION; SUPERSTRING MODELS; NONRENORMALIZATION THEOREMS; PHOTOMETRIC CORRECTIONS; SUPERSYMMETRY BREAKING; DENSITY PERTURBATIONS AB We discuss the particle physics basis for models of natural inflation with pseudo Nambu-Goldstone bosons and study the consequences for large-scale structure of the nonscale-invariant density fluctuation spectra that arise in natural inflation and other models. A pseudo Nambu-Goldstone boson, with a potential of the form V(phi) = LAMBDA4[1 +/- cos(phi/f)], can naturally give rise to an epoch of inflation in the early Universe, if f approximately M(Pl) and LAMBDA approximately M(GUT). Such mass scales arise in particle physics models with a gauge group that becomes strongly interacting at the grand unified theory scale. We work out a specific particle physics example based on the multiple gaugino condensation scenario in superstring theory. We then study the cosmological evolution of and constraints upon these inflation models numerically and analytically. To obtain sufficient inflation with a probability of order 1 and a high enough post-inflation reheat temperature for baryogenesis, we require f greater than or similar to 0.3 M(P1). The primordial density fluctuation spectrum generated by quantum fluctuations in phi is a non-scale-invariant power law P(k) is-proportional-to k(ns), with n(s) congruent-to 1 - (M(P1)2/8pif2) leading to more power on large length scales than the n(s) = 1 Harrison-Zeldovich spectrum. (For the reader primarily interested in large-scale structure, the discussion of this topic is presented in Sec. IV and is intended to be nearly self-contained.) We pay special attention to the prospects of using the enhanced power to explain the otherwise puzzling large-scale clustering of galaxies and clusters and their flows. We find that the standard cold dark matter (CDM) model with 0 less than or similar to n(s) less than or similar to 0.6 could in principle explain these data. However, the microwave background anisotropies recently detected by the Cosmic Background Explorer (COBE) imply such low primordial amplitudes for these CDM models (that is, bias factors b8 greater than or similar to 2 for n(s) less than or similar to 0.6) that galaxy formation would occur too late to be viable and the large-scale galaxy velocities would be too small. In fact, combining the COBE results with the requirement of sufficiently early galaxy formation (z(GF) > 2) leads to the constraint n(s) greater than or equal to 0.63, which corresponds to f greater than or similar to 0.3 M(P1) for natural inflation (virtually the same as the sufficient reheating constraint). A comparable bound n(s) greater than or equal to 0.72 arises by combining COBE with the inferred large-scale flows. For other inflation models, such as extended inflation and inflation with exponential potentials, which give rise to initial fluctuation spectra that are power laws through the 3 decades in wavelength probed by large-scale observations, gravity waves can produce a significant fraction of the COBE signal (while they are negligible for natural inflation); for these models, our corresponding COBE constraints on n, are therefore tighter, n, > 0. 76 (from z(GF) > 2) and n(s) > 0.89 (from large-scale flows). Combined with other constraints on the Brans-Dicke parameter (which effectively imply n(s) < 0.77-0.84), this leaves little or no room for most extended inflation models. Chaotic inflation models with power-law potentials have n(s) greater than or equal to 0.95 over observable wavelengths and so are not affected. Although no single value of the spectral index n(s) in the standard cold dark matter model universally fits the data, a value n(s) less-than-or-equal-to 1 may be combined with other variations of the standard CDM framework to explain the large-scale structure. For example, if the baryon density is as high as OMEGA(B) = 0.1 or the Hubble parameter as low as H0 = 40 km/(sec/Mpc), then n(s) approximately 0.7 with CDM would be at least marginally consistent with the large-scale structure data [e.g., the automatic plate measuring (APM) survey angular correlation function], COBE, large-scale velocities, and the requirement of sufficiently early structure formation. C1 UNIV CALIF SANTA BARBARA,INST THEORET PHYS,SANTA BARBARA,CA 93106. UNIV TORONTO,CANADIAN INST THEORET ASTROPHYS,COSMOL PROGRAM,TORONTO M5S 1A1,ONTARIO,CANADA. FERMI NATL ACCELERATOR LAB,NASA,FERMILAB ASTROPHYS CTR,BATAVIA,IL 60510. UNIV CHICAGO,DEPT ASTRON & ASTROPHYS,CHICAGO,IL 60637. RP ADAMS, FC (reprint author), UNIV MICHIGAN,DEPT PHYS,ANN ARBOR,MI 48109, USA. NR 100 TC 365 Z9 365 U1 0 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 JAN 15 PY 1993 VL 47 IS 2 BP 426 EP 455 DI 10.1103/PhysRevD.47.426 PG 30 WC Astronomy & Astrophysics; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA KG727 UT WOS:A1993KG72700008 ER PT J AU RATHER, JDG AF RATHER, JDG TI NASA ASTEROID REPORT SO SCIENCE LA English DT Letter RP RATHER, JDG (reprint author), NASA,WASHINGTON,DC 20546, USA. NR 1 TC 0 Z9 0 U1 0 U2 0 PU AMER ASSOC ADVANCEMENT SCIENCE PI WASHINGTON PA 1200 NEW YORK AVE, NW, WASHINGTON, DC 20005 SN 0036-8075 J9 SCIENCE JI Science PD JAN 15 PY 1993 VL 259 IS 5093 BP 293 EP 293 PG 1 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA KG624 UT WOS:A1993KG62400002 ER PT J AU WHEELER, DR AF WHEELER, DR TI EFFECT OF OXYGEN-PRESSURE FROM 10-9 TO 10-6 TORR ON THE FRICTION OF SPUTTERED MOSX FILMS SO THIN SOLID FILMS LA English DT Article ID COATINGS AB The effect of oxygen pressure in the range 10(-9) to 10(-6) Torr on the friction of sputtered MoS(x) films was determined in a pin-on-disk tribometer at a hertzian contact pressure of 0.44 GPa. The coefficient of friction was 0.04-0.05 at oxygen pressures of 1 x 10(-8) Torr or less. When 2 x 10(-8) Torr or more of oxygen was present during sliding the coefficient of friction decreased gradually to 0.01-0.02, independent of the pressure. However, static exposure to oxygen at any pressure did not affect the subsequent friction in vacuum. The wear scars with high friction were much larger than those with low friction. Oxygen may have reduced the friction force by causing a reduction in the shear strength of the film or a reduction in the area of contact. It is argued that the results are not consistent with a reduction in film shear strength. Rather, it is proposed that oxygen reduces the friction by influencing the transfer of material to the pin in such a way as to reduce the area of contact. With this hypothesis, a shear strength of 4.8 +/- 0.6 MPa, independent of oxygen pressure, was deduced for a representative film. RP WHEELER, DR (reprint author), NASA,LEWIS RES CTR,CLEVELAND,OH 44135, USA. NR 10 TC 8 Z9 8 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 JAN 15 PY 1993 VL 223 IS 1 BP 78 EP 86 DI 10.1016/0040-6090(93)90730-D PG 9 WC Materials Science, Multidisciplinary; Materials Science, Coatings & Films; Physics, Applied; Physics, Condensed Matter SC Materials Science; Physics GA KN451 UT WOS:A1993KN45100014 ER PT J AU SREEKUMAR, P BERTSCH, DL DINGUS, BL FICHTEL, CE HARTMAN, RC HUNTER, SD KANBACH, G KNIFFEN, DA LIN, YC MATTOX, JR MAYERHASSELWANDER, HA MICHELSON, PF VONMONTIGNY, C NOLAN, PL PINKAU, K SCHNEID, EJ STONE, RG THOMPSON, DJ AF SREEKUMAR, P BERTSCH, DL DINGUS, BL FICHTEL, CE HARTMAN, RC HUNTER, SD KANBACH, G KNIFFEN, DA LIN, YC MATTOX, JR MAYERHASSELWANDER, HA MICHELSON, PF VONMONTIGNY, C NOLAN, PL PINKAU, K SCHNEID, EJ STONE, RG THOMPSON, DJ TI CONSTRAINTS ON THE COSMIC-RAYS IN THE SMALL MAGELLANIC CLOUD SO PHYSICAL REVIEW LETTERS LA English DT Article ID GALACTIC GAMMA-RADIATION; TELESCOPE; DISTANCE; GALAXY AB Observations of the Small Magellanic Cloud using the Energetic Gamma Ray Experiment Telescope on the Compton Observatory yield an upper limit (95% confidence) for gamma-ray emission > 100 MeV of 0.5x10(-7) photon/cm2s. The expected flux if the cosmic rays are universal rather than galactic in origin is (2.4+/-0.5)x10(-7) photon/cm2s, only a third of which arise from cosmic ray electron interactions. Hence, the bulk of the cosmic ray energy density is almost certainly not metagalactic, and therefore galactic in origin. C1 MAX PLANCK INST EXTRATERRESTR PHYS,W-8046 GARCHING,GERMANY. STANFORD UNIV,HANSEN EXPTL PHYS LAB,STANFORD,CA 94305. GRUMMAN AEROSP CORP,BETHPAGE,NY 11714. HAMPDEN SYDNEY COLL,HAMPDEN SYDNEY,VA 23943. COMP SCI CORP,COMPTON OBSERV SCI SUPPORT CTR,GREENBELT,MD 20771. RP SREEKUMAR, P (reprint author), NASA,GODDARD SPACE FLIGHT CTR,GREENBELT,MD 20771, USA. RI Nolan, Patrick/A-5582-2009; Hunter, Stanley/D-2942-2012; Thompson, David/D-2939-2012; OI Thompson, David/0000-0001-5217-9135; Dingus, Brenda/0000-0001-8451-7450 NR 24 TC 62 Z9 63 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0031-9007 J9 PHYS REV LETT JI Phys. Rev. Lett. PD JAN 11 PY 1993 VL 70 IS 2 BP 127 EP 129 DI 10.1103/PhysRevLett.70.127 PG 3 WC Physics, Multidisciplinary SC Physics GA KF880 UT WOS:A1993KF88000007 ER PT J AU VEGGEBERG, S GOLDIN, D AF VEGGEBERG, S GOLDIN, D TI NASA ADMINISTRATOR GOLDIN,DANIEL EXPLAINS TIMING, PURPOSE OF BIG CHANGES AT AGENCY SO SCIENTIST LA English DT Editorial Material AB In an interview with The Scientist, National Aeronautics and Space Administration administrator Daniel Goldin responds to space scientists' criticisms of his controversial changes in the agency's management structure and personnel, and ponders his own future under the new presidential administration. C1 NASA,WASHINGTON,DC 20546. RP VEGGEBERG, S (reprint author), SCIENTIST,3501 MARKET ST,PHILADELPHIA,PA 19104, USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU SCIENTIST INC PI PHILADELPHIA PA 3600 MARKET ST SUITE 450, PHILADELPHIA, PA 19104 SN 0890-3670 J9 SCIENTIST JI Scientist PD JAN 11 PY 1993 VL 7 IS 1 BP 11 EP & PG 0 WC Information Science & Library Science; Multidisciplinary Sciences SC Information Science & Library Science; Science & Technology - Other Topics GA KF599 UT WOS:A1993KF59900006 ER PT J AU OVRYN, B HAACKE, EM AF OVRYN, B HAACKE, EM TI TEMPORAL AVERAGING OF PHASE MEASUREMENTS IN THE PRESENCE OF SPURIOUS PHASE DRIFT - APPLICATION TO PHASE-STEPPED REAL-TIME HOLOGRAPHIC-INTERFEROMETRY SO APPLIED OPTICS LA English DT Article DE TEMPORAL AVERAGING; COMPENSATION; PHASE STEPPING; PHASE DRIFT; HOLOGRAPHIC INTERFEROMETRY ID SHIFTING INTERFEROMETRY; FIBER; ACCURACY; SYSTEM; AIR AB A technique that compensates for low spatial frequency spurious phase changes during an interference experiment is developed; it permits temporal averaging of multiple phase measurements, made before and after object displacement. The method is tested with phase-stepped real-time holographic interferometry applied to cantilever bending of a piezoelectric bimorph ceramic. Results indicate that temporal averaging of the corrected data significantly reduces the white noise in a phase measurement without incurring systematic errors, or sacrificing spatial resolution. White noise is reduced from 3-degrees to less than 1-degrees (lambda/360) using these methods. C1 CASE WESTERN RESERVE UNIV, DEPT BIOMED ENGN, CLEVELAND, OH 44106 USA. CASE WESTERN RESERVE UNIV, DEPT RADIOL, CLEVELAND, OH 44106 USA. CASE WESTERN RESERVE UNIV, DEPT PHYS & BIOMED ENGN, CLEVELAND, OH 44106 USA. NASA, LEWIS RES CTR, CLEVELAND, OH 44135 USA. NR 18 TC 6 Z9 6 U1 0 U2 0 PU OPTICAL SOC AMER PI WASHINGTON PA 2010 MASSACHUSETTS AVE NW, WASHINGTON, DC 20036 USA SN 0003-6935 J9 APPL OPTICS JI Appl. Optics PD JAN 10 PY 1993 VL 32 IS 2 BP 147 EP 154 PG 8 WC Optics SC Optics GA KH734 UT WOS:A1993KH73400002 PM 20802670 ER PT J AU KASHLINSKY, A AF KASHLINSKY, A TI SMALL-SCALE MICROWAVE BACKGROUND ANISOTROPIES IMPLIED BY LARGE-SCALE DATA SO ASTROPHYSICAL JOURNAL LA English DT Article DE COSMIC MICROWAVE BACKGROUND; COSMOLOGY, THEORY; GALAXIES, FORMATION; LARGE-SCALE STRUCTURE OF UNIVERSE ID COLD DARK MATTER; RADIATION; FLUCTUATIONS; UNIVERSE; RECOMBINATION AB In the absence of reheating microwave background radiation (MBR) anisotropies on arcminute scales depend uniquely on the amplitude and the coherence length of the primordial density fluctuations (PDFs). These can be determined from the recent data on galaxy correlations, xi(r), on linear scales (APM survey). We develop here expressions for the MBR angular correlation function, C(theta), on arcminute scales in terms of the power spectrum of PDFs and demonstrate their accuracy by comparing with detailed calculations of MBR anisotropies. We then show how to evaluate C(theta) directly in terms of the observed xi(r) and show that the APM data give information on the amplitude, C(0), and the coherence angle of MBR anisotropies on small scales. The resultant MBR anisotropies are computed for a variety of cosmological models, and it is shown that in the absence of reheating there should be measurable MBR anisotropies (deltaT/T approximately 2 x 10(-5)) on scales theta approximately 15'-20' independently of the type of PDF and cosmological model (OMEGA, LAMBDA). Detection of such anisotropies can, therefore, determine if the universe went through a period of reheating after recombination. Reheating is possible only in models with isothermal/isocurvature PDFs, and this could provide an indirect test for the type of PDF. RP KASHLINSKY, A (reprint author), NASA,GODDARD SPACE FLIGHT CTR,ASTRON & SOLAR PHYS LAB,CODE 685,GREENBELT,MD 20771, USA. NR 27 TC 2 Z9 2 U1 0 U2 0 PU UNIV CHICAGO PRESS PI CHICAGO PA 5720 S WOODLAWN AVE, CHICAGO, IL 60637 SN 0004-637X J9 ASTROPHYS J JI Astrophys. J. PD JAN 10 PY 1993 VL 402 IS 2 BP 369 EP 374 DI 10.1086/172140 PN 1 PG 6 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA KG271 UT WOS:A1993KG27100002 ER PT J AU KROLIK, J DONE, C MADEJSKI, G AF KROLIK, J DONE, C MADEJSKI, G TI X-RAY LIGHT CURVES OF ACTIVE GALACTIC NUCLEI ARE PHASE INCOHERENT SO ASTROPHYSICAL JOURNAL LA English DT Article DE GALAXIES, ACTIVE; X-RAYS, GALAXIES ID VARIABILITY AB We compute the Fourier phase spectra for the light curves of five low-luminosity active galactic nuclei observed by EXOSAT. There is no statistically significant phase coherence in any of them. This statement is equivalent, subject to a technical caveat, to a demonstration that their fluctuation statistics are Gaussian. Models in which the X-ray output is controlled wholly by a unitary process undergoing a nonlinear limit cycle are therefore ruled out, while models with either a large number of randomly excited independent oscillation modes or nonlinearly interacting spatially dependent oscillations are favored. We also demonstrate how the degree of phase coherence in light curve fluctuations influences the application of causality bounds on internal length scales. C1 UNIV SPACE RES ASSOC,NASA,GODDARD SPACE FLIGHT CTR,HIGH ENERGY ASTROPHYS LAB,GREENBELT,MD 20771. RP KROLIK, J (reprint author), JOHNS HOPKINS UNIV,DEPT PHYS & ASTRON,BALTIMORE,MD 21218, USA. RI done, chris/D-4605-2016 OI done, chris/0000-0002-1065-7239 NR 14 TC 13 Z9 13 U1 0 U2 0 PU UNIV CHICAGO PRESS PI CHICAGO PA 5720 S WOODLAWN AVE, CHICAGO, IL 60637 SN 0004-637X J9 ASTROPHYS J JI Astrophys. J. PD JAN 10 PY 1993 VL 402 IS 2 BP 432 EP 440 DI 10.1086/172148 PN 1 PG 9 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA KG271 UT WOS:A1993KG27100010 ER PT J AU KOLMAN, M HALPERN, JP SHRADER, CR FILIPPENKO, AV FINK, HH SCHAEIDT, SG AF KOLMAN, M HALPERN, JP SHRADER, CR FILIPPENKO, AV FINK, HH SCHAEIDT, SG TI SIMULTANEOUS ROSAT, GINGA, VLA, IUE, AND OPTICAL OBSERVATIONS OF THE BRIGHT QUASAR H1821+643 SO ASTROPHYSICAL JOURNAL LA English DT Article DE QUASARS, INDIVIDUAL (H1821+643); RADIO CONTINUUM, GALAXIES; ULTRAVIOLET, GALAXIES; X-RAYS, GALAXIES ID ACTIVE GALACTIC NUCLEI; RADIO-QUIET QUASARS; X-RAY-SPECTRUM; ACCRETION DISK; ENERGY-DISTRIBUTIONS; SEYFERT-1 GALAXIES; ULTRAVIOLET EXCESS; LOW REDSHIFT; PG 1211+143; H-I AB We report on the first simultaneous optical, UV, and X-ray spectroscopy of the low-redshift (z = 0.297), high-luminosity QSO H1821+643. This multiwavelength campaign was complemented by optical imaging and radio mapping with the VLA. Although there was no significant variability during the 40 day monitoring period in either the UV or X-ray bands, a number of new results were obtained. There is significant variability in the optical, UV, and X-ray bands on time scales of years, both in flux level and spectral shape. In the co-added ultraviolet spectrum we detected a Lyman-alpha absorption line at z = 0.225. In the radio map the QSO is extended in the north-south direction at 20 cm, and can be resolved into two separate components at 6 cm. In the ROSAT data we separated (both spatially and spectroscopically) the emission originating in H 1 821 + 643 from the nearby hot white dwarf K 1 - 16, and thus we isolated the intrinsic soft X-ray excess in the QSO. The IUE and ROSAT data were combined with new optical spectroscopy and hard X-ray data from Ginga, to reveal a strong optical/UV bump with a flat slope (alpha approximately - 0.96, f(nu) is-proportional-to nu(alpha)) in the UV, a steep soft X-ray excess (alpha approximately - 4) between approximately 0. 15 keV and approximately 0.5 keV, and a typical hard X-ray slope of alpha approximately - 0.8 extending up to 10 keV. While the optical/UV bump and the soft X-ray excess can each be fit satisfactorily with standard accretion disk models, a joint fit to the optical/UV/X-ray bump cannot be achieved. This suggests that either the optical/UV or the soft X-ray emission do not arise in an accretion disk, or that the standard bare disk model should be modified (possibly by inclusion of electron scattering) to account for both the strong, flat UV emission and the steep, soft X-ray excess. C1 COMP SCI CORP,NASA,GSFC,ASTRON PROGRAMS,GREENBELT,MD 20771. UNIV CALIF BERKELEY,DEPT ASTRON,BERKELEY,CA 94720. MAX PLANCK INST EXTRATERRESTR PHYS,W-8046 GARCHING,GERMANY. RP KOLMAN, M (reprint author), COLUMBIA UNIV,COLUMBIA ASTROPHYS LAB,538 W 120TH ST,NEW YORK,NY 10027, USA. NR 52 TC 32 Z9 32 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 JAN 10 PY 1993 VL 402 IS 2 BP 514 EP 531 DI 10.1086/172153 PN 1 PG 18 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA KG271 UT WOS:A1993KG27100015 ER PT J AU ANDERSON, BG WANNIER, PG AF ANDERSON, BG WANNIER, PG TI WARM NEUTRAL HALOS AROUND MOLECULAR CLOUDS .5. PHYSICAL AND CHEMICAL MODELING SO ASTROPHYSICAL JOURNAL LA English DT Article DE ISM, CLOUDS; ISM, MOLECULES ID DIFFUSE INTERSTELLAR CLOUDS; H-I; ATOMIC-HYDROGEN; ABUNDANCES; EMISSION; GAS AB We present a combined physical and chemical modeling of the halos around molecular clouds, with particular emphasis on the H-to-H-2 transition. Based on H I 21 cm observations, we show that the halos are extended. A physical model is used in conjunction with a chemistry code, to provide a self-consistent description of the gas. The radiative transfer code provides a check with H I, CO, and OH observations. We conclude that the warm neutral halos are not gravitationally bound to the underlying molecular clouds and are isobaric. The vertical pressure distribution of the halo gas above the Galactic plane follows the e-(z/h)2 distribution expected for a gas in hydrostatic equilibrium. The pressure is larger than that previously inferred for the diffuse atomic gas, and the scale height is that of the molecular, rather than the atomic medium. Thus, unless there is some additional pressure component in the diffuse medium, they are likely to be expanding into the diffuse gas. This conclusion is in accord with earlier observations of the B5 cloud halo which appears to be expanding. Finally, the observed extent of the H I envelopes and the large observed abundance of OH in them imply that the generally accepted rate for H-2 formation on grains is too large by a factor of several. This conclusion is supported by recent theoretical work on H-2 formation. C1 GOTHENBURG UNIV,CHALMERS TEKNISKA HOGSKOLA,INST THEORET PHYS,S-41124 GOTHENBURG,SWEDEN. RP ANDERSON, BG (reprint author), JET PROP LAB,MAIL STOP 169-506,4800 OAK GROVE DR,PASADENA,CA 91109, USA. NR 44 TC 39 Z9 39 U1 0 U2 0 PU UNIV CHICAGO PRESS PI CHICAGO PA 5720 S WOODLAWN AVE, CHICAGO, IL 60637 SN 0004-637X J9 ASTROPHYS J JI Astrophys. J. PD JAN 10 PY 1993 VL 402 IS 2 BP 585 EP 592 DI 10.1086/172161 PN 1 PG 8 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA KG271 UT WOS:A1993KG27100023 ER PT J AU JOHNSON, HR AKE, TB AMEEN, MM AF JOHNSON, HR AKE, TB AMEEN, MM TI COMPANIONS TO BRIGHT S-STAR AND MS-STAR - TECHNETIUM DEFICIENCY AND BINARITY SO ASTROPHYSICAL JOURNAL LA English DT Article DE BINARIES, CLOSE; NUCLEAR REACTIONS, NUCLEOSYNTHESIS, ABUNDANCES; STARS, ABUNDANCES; STARS, CARBON; STARS, EVOLUTION; ULTRAVIOLET, STARS ID CARBON STARS; CHEMICAL-COMPOSITION; WHITE-DWARFS; RED GIANTS; BARIUM; EVOLUTION; CLUSTERS AB To test the popular hypothesis that technetium-deficient stars of spectral types S and MS are mass-transfer binaries, we have searched for ultraviolet light from the putative hot secondaries in spectra taken with the SWP spectrograph of IUE. Although most S and MS stars are apparently thermally pulsing AGB (asymptotic giant branch) stars whose surfaces have been enriched with s-process elements and carbon dredged up from the interior, those stars whose spectra show enhanced s-process elements but no Tc are widely believed to be cooler analogs of the Ba II stars, which apparently owe their unusual abundances to prior mass transfer, the Tc from which has decayed away. We report IUE observations of 15 S and MS stars with the SWP, including the identification of six hot companions. Assembling all the IUE observations made to date, we find clear support for the mass-transfer hypothesis, confirming evidence from other lines of research. We further discuss the ages of the companions and the implications of these discoveries for stellar evolution. C1 COMP SCI CORP,GODDARD SPACE FLIGHT CTR,ASTRON PROGRAMS,GREENBELT,MD 20771. RP JOHNSON, HR (reprint author), INDIANA UNIV,DEPT ASTRON SW319,BLOOMINGTON,IN 47405, USA. NR 49 TC 19 Z9 20 U1 0 U2 0 PU UNIV CHICAGO PRESS PI CHICAGO PA 5720 S WOODLAWN AVE, CHICAGO, IL 60637 SN 0004-637X J9 ASTROPHYS J JI Astrophys. J. PD JAN 10 PY 1993 VL 402 IS 2 BP 667 EP 679 DI 10.1086/172168 PN 1 PG 13 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA KG271 UT WOS:A1993KG27100030 ER PT J AU GOEBEL, JH GOORVITCH, D LARSON, HP ALEXANDER, DR AF GOEBEL, JH GOORVITCH, D LARSON, HP ALEXANDER, DR TI A DEEP ENVELOPE COMPOSITION FOR TX PISCIUM SO ASTROPHYSICAL JOURNAL LA English DT Article DE STARS, ABUNDANCES; STARS, ATMOSPHERES; STARS, CARBON; STARS, INDIVIDUAL (TX PISCIUM) ID COOL CARBON STARS; INFRARED-SPECTRUM; ATMOSPHERES; SPECTROPHOTOMETRY; MOLECULES; AIRBORNE; EMISSION; GIANTS; BAND; C-2 AB Observations of the carbon star TX Psc (for which the angular diameter and effective temperature have been independently established) are reported at high resolution in the 4000 cm-1 spectral region and at moderate resolution from 2500 to 8000 cm-1. Model atmospheres of carbon stars with normal solar oxygen abundance and deep envelope composition are presented that include HCN and C2H2 (polyatomics) line opacity using the opacity sampling technique. The 3900-4000 cm-1 region is dominated by CO opacity. CN and C2 contribute only a minor amount of opacity in this spectral region. The CO features in this spectral range are good diagnostic probes of the stellar CO and oxygen abundances. A comparison of the models with the observations lead to the following conclusions. The oxygen abundance of TX Psc is more accurately represented by a deep envelope composition depleted in oxygen by roughly two orders of magnitude than by a solar oxygen abundance. Hence the CNO tricycle of nuclear burning reactions appears to dominate the photospheric abundances of TX Psc, as opposed to the 3alpha reaction through the mechanism of helium shell flashes. Polyatomic opacities influence the CO line depths and the derived oxygen abundance as a second-order effect. Polyatomic bands appear to be far too strong in the models, implying the need for another source of opacity to back-warm the outer atmosphere and thereby limit the polyatomic band depths. Dust, rather than polyatomic molecules, is a candidate for the backwarming opacity. The presence of HCN molecules without C2H2 molecules in the spectrum of TX Psc is also consistent with a CNO composition atmoshere. C1 UNIV ARIZONA,LUNAR & PLANETARY LAB,TUCSON,AZ 85721. WICHITA STATE UNIV,DEPT PHYS,WICHITA,KS 67208. NASA,AMES RES CTR,DIV SPACE SCI,ASTROPHYS BRANCH,MOFFETT FIELD,CA 94035. RP GOEBEL, JH (reprint author), NASA,AMES RES CTR,DIV SPACE PROJECTS,TECHNOL DEV BRANCH,MOFFETT FIELD,CA 94035, USA. NR 52 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 JAN 10 PY 1993 VL 402 IS 2 BP 680 EP 693 DI 10.1086/172169 PN 1 PG 14 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA KG271 UT WOS:A1993KG27100031 ER PT J AU LINSKY, JL BROWN, A GAYLEY, K DIPLAS, A SAVAGE, BD AYRES, TR LANDSMAN, W SHORE, SN HEAP, SR AF LINSKY, JL BROWN, A GAYLEY, K DIPLAS, A SAVAGE, BD AYRES, TR LANDSMAN, W SHORE, SN HEAP, SR TI GODDARD HIGH-RESOLUTION SPECTROGRAPH OBSERVATIONS OF THE LOCAL INTERSTELLAR-MEDIUM AND THE DEUTERIUM HYDROGEN RATIO ALONG THE LINE OF SIGHT TOWARD CAPELLA SO ASTROPHYSICAL JOURNAL LA English DT Article DE ISM, ABUNDANCES; STARS, INDIVIDUAL ALPHA-AURIGAE); ULTRAVIOLET, INTERSTELLAR ID BETA-CANIS-MAJORIS; ULTRAVIOLET OBSERVATIONS; DIFFUSE CLOUDS; LYMAN-ALPHA; ZETA-PERSEI; COOL STARS; MASS RATIO; H-I; ABUNDANCES; SPECTROGRAPH AB We analyze HST Goddard High-Resolution Spectrograph observations of the 1216, 2600, and 2800 angstrom spectral regions for the spectroscopic binary system Capella, obtained at orbital phase 0.26 with 3.27-3.57 km s-1 resolution and high signal-to-noise ratio. We infer the column densities of H I, D I, Mg II, and Fe II for the local interstellar medium along this 12.5 pc line of sight, together with estimates of the temperature and turbulent velocity. If we assume that the intrinsic Lyalpha lines of the component stars in the Capella system can be approximated as scaled solar lines (with self-reversals), which is consistent with the observed Lyalpha profile of the high radial velocity star delta Lep, then the interstellar neutral hydrogen column density toward Capella, N(HI) = 1.80(+/- 0.1) x 10(18) cm-2. This corresponds to an average hydrogen number density, n(HI) = 0.047 cm-3. To account for a wider range of intrinsic line profiles that may characterize the more active Capella stars, we increase the allowed range of N(HI) to 1.8(+ 0.3, - 0.1) x 10(18) cm-2. The deuterium column density and line width parameter are found to be N(DI) = 2.97( + 0.13, - 0.05) x 10(13) cm-2 and b(D) = 7.81(+ 0.23, - 0.03) km s-1. The widths of the interstellar D I, Mg II, and Fe II lines indicate that the broadening has both thermal and turbulent components with the temperature T = 7000 +/- 200 K, and the turbulent velocity xi = 1.66 +/- 0.03 km s-1. These parameters indicate that b(HI) = 10.9 km s-1. We infer that the atomic deuterium/hydrogen ratio by number is (D/H)LISM = 1.65(+ 0.07, - 0.18) x 10(-5) for this line of sight. Our value of the D/H ratio lies near the mean of many earlier but less certain values for the Capella line of sight and toward other stars located as far as 1 kpc from the Sun. We present evidence that a constant value for (D/H)LISM in the nearby Galactic disk should be adopted as the best available working hypothesis, but this hypothesis must be tested by future HST observations of Capella at phase 0.75 and of other stars. Galactic evolution calculations indicate that the primordial D/H ratio, (D/H)p, probably lies in the range of (1.5-3) x (D/H)LISM. Standard big bang nucleosynthesis models for (D/H)p = 2.2-2.5 x 10(-5) imply that OMEGA(B)h50(2) = 0.06-0.08, where OMEGA(B) is the baryonic density in units of the Einstein-de Sitter closure density, and h50 is the Hubble constant in units of 50 km s-1 Mpc-1. If H-0 = 80 km s-1 Mpc-1 as recent evidence suggests, then OMEGA(B) = 0.023-0.031. Thus the universe will expand forever, unless nonbaryonic matter greatly exceeds the amount of baryonic matter. C1 UNIV COLORADO,JOINT INST LAB ASTROPHYS,BOULDER,CO 80309. UNIV WISCONSIN,DEPT ASTRON,MADISON,WI 53706. UNIV COLORADO,CTR ASTROPHYS & SPACE ASTRON,BOULDER,CO 80309. NASA,GODDARD SPACE FLIGHT CTR,STX,GREENBELT,MD 20771. RP LINSKY, JL (reprint author), NATL INST STAND & TECHNOL,DIV QUANTUM PHYS,BOULDER,CO 80309, USA. NR 80 TC 250 Z9 250 U1 0 U2 0 PU UNIV CHICAGO PRESS PI CHICAGO PA 5720 S WOODLAWN AVE, CHICAGO, IL 60637 SN 0004-637X J9 ASTROPHYS J JI Astrophys. J. PD JAN 10 PY 1993 VL 402 IS 2 BP 694 EP 709 DI 10.1086/172170 PN 1 PG 16 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA KG271 UT WOS:A1993KG27100032 ER PT J AU PATERNO, L VENTURA, R CANUTO, VM MAZZITELLI, I AF PATERNO, L VENTURA, R CANUTO, VM MAZZITELLI, I TI HELIOSEISMOLOGICAL TEST OF A NEW MODEL FOR STELLAR CONVECTION SO ASTROPHYSICAL JOURNAL LA English DT Article DE CONVECTION; SUN, INTERIOR; SUN, OSCILLATIONS; TURBULENCE ID TURBULENT COMPRESSIBLE CONVECTION; SOLAR OSCILLATIONS; DEEP ATMOSPHERE; FREQUENCIES; EIGENFREQUENCIES; HELIUM; SUN AB We compare the predictions of two solar models with the observed p-mode eigenfrequencies. The two models use the same input microphysics (nuclear reaction rates, opacity, and equation of state) and the same numerical evolutionary code, but differ in the treatment of turbulent convection. The first model employs the standard mixing-length theory of convection (MLT), while the second model employs a new model of turbulent convection (CM) whose primary goal was that of accounting for the whole spectrum of turbulent eddies so as to avoid the MLT approximation that such a wide spectrum be represented by a single, large eddy. With the suggestion that the mixing length, LAMBDA, be taken to be z, the distance to the nearest convective boundary, the new CM model has no free parameters, and yet it predicts a solar T(eff) to within 0.5%. The LAMBDA = z suggestion, within the context of the MLT, would yield T(eff) of by approximately 3% that forces the introduction of LAMBDA = alphaH(p), with alpha a free, adjustable parameter. The main result of this paper is that the p-mode eigenfrequencies calculated with the CM model show an overall improvement with respect to those calculated with the standard MLT model. C1 OSSERV ASTROFIS CATANIA,I-95125 CATANIA,ITALY. NASA,GODDARD INST SPACE STUDIES,NEW YORK,NY 10025. CNR,IST ASTROFIS SPAZIALE,I-00044 FRASCATI,ITALY. RP PATERNO, L (reprint author), UNIV CATANIA,IST ASTRON,CITTA UNIV,VIALE A DORIA 6,I-95125 CATANIA,ITALY. RI Ventura, Rita/B-7524-2016 OI Ventura, Rita/0000-0002-5152-0482 NR 32 TC 34 Z9 34 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 JAN 10 PY 1993 VL 402 IS 2 BP 733 EP 740 DI 10.1086/172173 PN 1 PG 8 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA KG271 UT WOS:A1993KG27100035 ER PT J AU HILL, JK GESSNER, SE BOHLIN, RC CHENG, KP HINTZEN, PMN OCONNELL, RW ROBERTS, MS SMITH, AM SMITH, EP STECHER, TP AF HILL, JK GESSNER, SE BOHLIN, RC CHENG, KP HINTZEN, PMN OCONNELL, RW ROBERTS, MS SMITH, AM SMITH, EP STECHER, TP TI ULTRAVIOLET IMAGING TELESCOPE IMAGES - LIMITS ON RECENT STAR FORMATION IN HOLMBERG-IX SO ASTROPHYSICAL JOURNAL LA English DT Article DE GALAXIES, INDIVIDUAL (HOLMBERG-IX); ULTRAVIOLET, GALAXIES ID STELLAR CONTENT; LUMINOSITY FUNCTION; GALAXIES; PHOTOMETRY; PEGASUS; M81 AB Ultraviolet Imaging Telescope near-UV and far-UV images of Holmberg IX show no OB associations. Relative fluxes measured for the galaxy as a whole in the UV and optical B and V bands are consistent with models in which approximately 0.6-0.7 of the V flux is from an old population of age 10 Gyr, while the remainder is from stars of age 20-200 Myr, which also contribute 0.80 of the near-UV flux and 0.99 of the far-UV flux. Individual stars measured in B and V appear to be evolved stars of mass approximately 12 M. and age approximately 20 Myr belonging to the youngest population in the galaxy. C1 UNIV ALABAMA,DEPT PHYS & ASTRON,TUSCALOOSA,AL 35487. ASSOC UNIV INC,NATL RADIO ASTRON OBSERV,NATL SCI FDN,CHARLOTTESVILLE,VA 22903. UNIV VIRGINIA,CHARLOTTESVILLE,VA 22903. UNIV NEVADA,DEPT PHYS & ASTRON,LAS VEGAS,NV 89154. SPACE TELESCOPE SCI INST,BALTIMORE,MD 21218. NASA,GODDARD SPACE FLIGHT CTR,ASTRON & SOLAR PHYS LAB,GREENBELT,MD 20771. RP HILL, JK (reprint author), HUGHES STX,440 FORBES BLVD,LANHAM,MD 20706, USA. NR 19 TC 10 Z9 10 U1 0 U2 0 PU UNIV CHICAGO PRESS PI CHICAGO PA 5720 S WOODLAWN AVE, CHICAGO, IL 60637 SN 0004-637X J9 ASTROPHYS J JI Astrophys. J. PD JAN 10 PY 1993 VL 402 IS 2 BP L45 EP & DI 10.1086/186696 PN 2 PG 0 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA KG273 UT WOS:A1993KG27300005 ER PT J AU KAUFMAN, YJ HOLBEN, BN AF KAUFMAN, YJ HOLBEN, BN TI CALIBRATION OF THE AVHRR VISIBLE AND NEAR-IR BANDS BY ATMOSPHERIC SCATTERING, OCEAN GLINT AND DESERT REFLECTION SO INTERNATIONAL JOURNAL OF REMOTE SENSING LA English DT Article ID SATELLITE SENSORS; IMAGES; NOAA-7 AB An inflight calibration for AVHRR visible and near-IR bands is discussed and applied to NOAA-7, NOAA-9 and NOAA-11 from 1981 to 1990. The approach, independent of ground support, relies on three unique earth-atmosphere phenomena: molecular scattering over the ocean for absolute visible band calibration, ocean glint to transfer the calibration from the visible band to the near-IR band, and desert reflectance to monitor, independently, the stability of the visible and near-IR bands. The resulting two calibration methods differ in the brightness range and spectral response of the radiance source (molecular scattering versus desert reflectance). Both methods agreed on calibration deterioration for NOAA-9 of 10 +/- 3 per cent in the visible band and 16 +/- 2 per cent in the near-IR shortly after launch, and 22 +/- 2 per cent in both bands three years later. The ocean method showed an increase of 6 per cent and 9 per cent in the sensitivity of the visible and near-IR bands respectively over the lifetime of NOAA-7. However, the desert method showed a decrease of 10 and 12 per cent, respectively, in the two bands. Possible reasons for the differences between the resultant calibration for NOAA-7 from the two methods are discussed. NOAA-11 was calibrated using the desert radiances only. Its inflight response was lower from the preflight response by 21 per cent in channel 1 and 33 per cent in channel 2, a short time after launch. Recommendations for the absolute calibration of NOAA-7, -9 and -11 are given for channels 1 and 2 as a function of time and are compared with other published AVHRR calibrations. The calibration deterioration results in a change in the vegetation index (NDVI) between 0.0 and 0.09. A simple correction scheme is suggested for uncorrected NOAA-7, -9 and -11 NDVI and implications of the calibration ratio on AVHRR remote sensing are discussed. C1 NASA,GODDARD SPACE FLIGHT CTR,TERR PHYS LAB,GREENBELT,MD 20771. RP KAUFMAN, YJ (reprint author), NASA,GODDARD SPACE FLIGHT CTR,ATMOSPHERES LAB,CODE 913,GREENBELT,MD 20771, USA. NR 39 TC 214 Z9 218 U1 2 U2 13 PU TAYLOR & FRANCIS LTD PI LONDON PA ONE GUNDPOWDER SQUARE, LONDON, ENGLAND EC4A 3DE SN 0143-1161 J9 INT J REMOTE SENS JI Int. J. Remote Sens. PD JAN 10 PY 1993 VL 14 IS 1 BP 21 EP 52 PG 32 WC Remote Sensing; Imaging Science & Photographic Technology SC Remote Sensing; Imaging Science & Photographic Technology GA KL342 UT WOS:A1993KL34200003 ER PT J AU GUPTA, SK WILBER, AC DARNELL, WL SUTTLES, JT AF GUPTA, SK WILBER, AC DARNELL, WL SUTTLES, JT TI LONGWAVE SURFACE RADIATION OVER THE GLOBE FROM SATELLITE DATA - AN ERROR ANALYSIS SO INTERNATIONAL JOURNAL OF REMOTE SENSING LA English DT Article ID OCEAN SURFACE; CLOUD-CLIMATOLOGY; METHODOLOGY; VALIDATION; MODELS; CODES; ISCCP AB Errors have been analysed for monthly-average downward and net longwave surface fluxes derived on a 5-degrees equal-area grid over the globe using a satellite technique. The parametrized equations used for flux computation were derived from a detailed radiative transfer model. Meteorological data used in this technique are available from the TIROS Operational Vertical Sounder (TOVS) system flown aboard NOAA's operational Sun-synchronous satellites. The data used are for February 1982 from NOAA-6 and NOAA-7 satellites. The errors in the parametrized equations were estimated by comparing their results with those from a detailed radiative transfer model. The errors in the TOVS-derived surface temperature, water vapour burden and cloud cover were estimated by comparing these meteorological parameters with independent measurements obtained from other satellite sources. Analysis of the overall errors shows that the present technique could lead to underestimation of downward fluxes by 5 to 15 W m-2 and net fluxes by 4 to 12 W m-2. C1 NASA,LANGLEY RES CTR,DIV ATMOSPHER SCI,HAMPTON,VA 23665. RP GUPTA, SK (reprint author), LOCKHEED ENGN & SCI CO,HAMPTON,VA, USA. NR 25 TC 17 Z9 18 U1 2 U2 4 PU TAYLOR & FRANCIS LTD PI LONDON PA ONE GUNDPOWDER SQUARE, LONDON, ENGLAND EC4A 3DE SN 0143-1161 J9 INT J REMOTE SENS JI Int. J. Remote Sens. PD JAN 10 PY 1993 VL 14 IS 1 BP 95 EP 114 PG 20 WC Remote Sensing; Imaging Science & Photographic Technology SC Remote Sensing; Imaging Science & Photographic Technology GA KL342 UT WOS:A1993KL34200006 ER PT J AU MARROCU, M POMPEI, A DALU, G LIBERTI, GL NEGRI, A AF MARROCU, M POMPEI, A DALU, G LIBERTI, GL NEGRI, A TI PRECIPITATION ESTIMATION OVER SARDINIA FROM SATELLITE INFRARED DATA SO INTERNATIONAL JOURNAL OF REMOTE SENSING LA English DT Article ID RAIN ESTIMATION; CLOUD; MODEL AB Three techniques for the estimate of rain rate from infrared satellite images have been examined and modified to be used over the western Mediterranean Sea. An attempt to optimize these techniques has been made by comparing the remotely-sensed precipitation with in situ data, obtained from the rain gauge network over Sardinia, for three different seasons of 1988. The results obtained so far clearly reveal the limitations of infrared remote sensing techniques when applied to precipitation retrievals. However, these results give the possibility of gaining some useful insights on the general problem and show that infrared remote sensing techniques can give acceptable area-time averages of precipitation which are useful for climatological studies. C1 IST FIS ATMOSFERA,I-00144 ROME,ITALY. NASA,GODDARD SPACE FLIGHT CTR,ATMOSPHERES LAB,GREENBELT,MD 20771. RP MARROCU, M (reprint author), DIPARTIMENTO SCI FIS,VIA OSPED 72,I-09100 CAGLIARI,ITALY. RI Liberti, Gian Luigi/C-3331-2013; OI Liberti, Gian Luigi/0000-0002-1906-5248; LIBERTI, GIANLUIGI/0000-0003-0091-8607 NR 28 TC 13 Z9 13 U1 0 U2 1 PU TAYLOR & FRANCIS LTD PI LONDON PA ONE GUNDPOWDER SQUARE, LONDON, ENGLAND EC4A 3DE SN 0143-1161 J9 INT J REMOTE SENS JI Int. J. Remote Sens. PD JAN 10 PY 1993 VL 14 IS 1 BP 115 EP 134 PG 20 WC Remote Sensing; Imaging Science & Photographic Technology SC Remote Sensing; Imaging Science & Photographic Technology GA KL342 UT WOS:A1993KL34200007 ER PT J AU SCHOEBERL, MR BHARTIA, PK HILSENRATH, E TORRES, O AF SCHOEBERL, MR BHARTIA, PK HILSENRATH, E TORRES, O TI TROPICAL OZONE LOSS FOLLOWING THE ERUPTION OF MT PINATUBO SO GEOPHYSICAL RESEARCH LETTERS LA English DT Article ID EL-CHICHON; CHEMISTRY AB Total Ozone Mapping Spectrometer (TOMS) measurements of equatorial total ozone following the eruption of Mt. Pinatubo show a decrease of up to 6% over climatology. Ozone losses begin approximately a month following the eruption, consistent with the time required for the SO2 to convert to sulfuric acid aerosol. The thick aerosol layer interferes with the TOMS retrieval, but this interference is small and easily accounted for in the retrieval. Ozone values remain below climatology until December, 1991. Ozonesonde data from Natal, Brazil taken before and two months after the eruption support TOMS observations of ozone loss. These sondes show that the ozone loss region is confined to a 2-3 km thick layer between 24 and 28 km. RP SCHOEBERL, MR (reprint author), NASA,GODDARD SPACE FLIGHT CTR,CODE 916,GREENBELT,MD 20771, USA. RI Torres, Omar/G-4929-2013; Bhartia, Pawan/A-4209-2016 OI Bhartia, Pawan/0000-0001-8307-9137 NR 19 TC 77 Z9 78 U1 0 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 JAN 8 PY 1993 VL 20 IS 1 BP 29 EP 32 DI 10.1029/92GL02637 PG 4 WC Geosciences, Multidisciplinary SC Geology GA KH688 UT WOS:A1993KH68800008 ER PT J AU CHANDRA, S AF CHANDRA, S TI CHANGES IN STRATOSPHERIC OZONE AND TEMPERATURE DUE TO THE ERUPTIONS OF MT PINATUBO SO GEOPHYSICAL RESEARCH LETTERS LA English DT Article AB The impact of the Mt. Pinatubo eruptions on the total column ozone measured from the Nimbus 7 TOMS and the NOAA -11 SBUV/2 spectrometers has been studied. The ozone anomalies inferred from the two instruments agree within 1-2 % in the presence of large volcanic clouds produced by Pinatubo. The Pinatubo eruptions took place on June 15-16, 1991 during the easterly phase of the quasi biennial oscillations (QBO) and as such present a different dynamical scenario for the changes in stratospheric ozone compared to the El Chichon eruptions which took place during the westerly phase of the QBO. Within a few months after the eruptions, the total column ozone decreased by 5-6 % in the tropics, 3 to 4 % at mid-latitudes and 6-9 % at high latitudes in the northern hemisphere. However, after the effects of QBO and interannual variability are taken into account, the decrease in the column ozone attributed to volcanic eruptions at these latitudes may not be more than 2-4 % - a conclusion in general agreement with a similar study of the El Chichon effects on the stratospheric ozone. The most noticeable effect of the Pinatubo eruptions, as observed during the El Chichon period, is the breakdown of the phase relation between ozone and temperature. This is attributed to additional heating in the lower stratosphere caused by volcanic aerosols. RP CHANDRA, S (reprint author), NASA,GODDARD SPACE FLIGHT CTR,CODE 916,GREENBELT,MD 20771, USA. NR 14 TC 51 Z9 52 U1 0 U2 5 PU AMER GEOPHYSICAL UNION PI WASHINGTON PA 2000 FLORIDA AVE NW, WASHINGTON, DC 20009 SN 0094-8276 J9 GEOPHYS RES LETT JI Geophys. Res. Lett. PD JAN 8 PY 1993 VL 20 IS 1 BP 33 EP 36 DI 10.1029/92GL03013 PG 4 WC Geosciences, Multidisciplinary SC Geology GA KH688 UT WOS:A1993KH68800009 ER PT J AU CHYBA, CF THOMAS, PJ ZAHNLE, KJ AF CHYBA, CF THOMAS, PJ ZAHNLE, KJ TI THE 1908 TUNGUSKA EXPLOSION - ATMOSPHERIC DISRUPTION OF A STONY ASTEROID SO NATURE LA English DT Article ID METEOR FALL; COMET; EVENT; BREAKUP; EARTH AB The explosion over Tunguska, Central Siberia, in 1908 released 10 to 20 megatons (high explosive equivalent) of energy at an altitude of about 10 km. This event represents a typical fate for stony asteroids tens of metres in radius entering the Earth's atmosphere at common hypersonic velocities. Comets and carbonaceous asteroids of the appropriate energy disrupt too high, whereas typical iron objects reach and crater the terrestrial surface. C1 NASA,AMES RES CTR,DIV SPACE SCI,MOFFETT FIELD,CA 94035. UNIV WISCONSIN,DEPT PHYS & ASTRON,EAU CLAIRE,WI 54702. NR 45 TC 236 Z9 240 U1 1 U2 31 PU MACMILLAN MAGAZINES LTD PI LONDON PA PORTERS SOUTH, 4 CRINAN ST, LONDON, ENGLAND N1 9XW SN 0028-0836 J9 NATURE JI Nature PD JAN 7 PY 1993 VL 361 IS 6407 BP 40 EP 44 DI 10.1038/361040a0 PG 5 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA KF718 UT WOS:A1993KF71800039 ER PT B AU STEINMAN, JS AF STEINMAN, JS BE Evans, GW Mollaghasemi, M Russell, EC Biles, WE TI INCREMENTAL STATE SAVING IN SPEEDES USING C++ SO 1993 WINTER SIMULATION CONFERENCE PROCEEDINGS LA English DT Proceedings Paper CT 1993 Winter Simulation Conference CY DEC 12-15, 1993 CL LOS ANGELES, CA SP AMER STAT ASSOC, ASSOC COMP MACHINERY, SPECIAL INTEREST GRP SIMULAT, IEEE, COMP SOC, IEEE, SYST MAN & CYBERNET SOC, INST IND ENGINEERS, NIST, OPERAT RES SOC AMER, INST MANAGEMENT SCI, COLL SIMULAT, SOC COMP SIMULAT INT C1 JET PROP LAB,PASADENA,CA 91109. NR 0 TC 1 Z9 1 U1 0 U2 0 PU I E E E PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 BN 0-7803-1381-X PY 1993 BP 687 EP 696 PG 10 WC Computer Science, Interdisciplinary Applications; Engineering, Electrical & Electronic SC Computer Science; Engineering GA BA27E UT WOS:A1993BA27E00095 ER PT B AU DICKENS, PM REYNOLDS, PF NICOL, DM DUVA, JM AF DICKENS, PM REYNOLDS, PF NICOL, DM DUVA, JM BE Evans, GW Mollaghasemi, M Russell, EC Biles, WE TI THE IMPACT OF ADDING AGGRESSIVENESS TO A NONAGGRESSIVE WINDOWING PROTOCOL SO 1993 WINTER SIMULATION CONFERENCE PROCEEDINGS LA English DT Proceedings Paper CT 1993 Winter Simulation Conference CY DEC 12-15, 1993 CL LOS ANGELES, CA SP AMER STAT ASSOC, ASSOC COMP MACHINERY, SPECIAL INTEREST GRP SIMULAT, IEEE, COMP SOC, IEEE, SYST MAN & CYBERNET SOC, INST IND ENGINEERS, NIST, OPERAT RES SOC AMER, INST MANAGEMENT SCI, COLL SIMULAT, SOC COMP SIMULAT INT C1 NASA,LANGLEY RES CTR,INST COMP APPLICAT SCI & ENGN,HAMPTON,VA 23681. NR 0 TC 0 Z9 0 U1 0 U2 0 PU I E E E PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 BN 0-7803-1381-X PY 1993 BP 731 EP 739 PG 9 WC Computer Science, Interdisciplinary Applications; Engineering, Electrical & Electronic SC Computer Science; Engineering GA BA27E UT WOS:A1993BA27E00100 ER PT B AU MERTENS, S AF MERTENS, S BE Evans, GW Mollaghasemi, M Russell, EC Biles, WE TI THE CORPS BATTLE SIMULATION FOR MILITARY TRAINING SO 1993 WINTER SIMULATION CONFERENCE PROCEEDINGS LA English DT Proceedings Paper CT 1993 Winter Simulation Conference CY DEC 12-15, 1993 CL LOS ANGELES, CA SP AMER STAT ASSOC, ASSOC COMP MACHINERY, SPECIAL INTEREST GRP SIMULAT, IEEE, COMP SOC, IEEE, SYST MAN & CYBERNET SOC, INST IND ENGINEERS, NIST, OPERAT RES SOC AMER, INST MANAGEMENT SCI, COLL SIMULAT, SOC COMP SIMULAT INT C1 JET PROP LAB,PASADENA,CA 91109. NR 0 TC 1 Z9 1 U1 0 U2 0 PU I E E E PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 BN 0-7803-1381-X PY 1993 BP 1053 EP 1056 PG 4 WC Computer Science, Interdisciplinary Applications; Engineering, Electrical & Electronic SC Computer Science; Engineering GA BA27E UT WOS:A1993BA27E00144 ER PT B AU GAT, E FEAREY, J PROVENZANO, J AF GAT, E FEAREY, J PROVENZANO, J BE Evans, GW Mollaghasemi, M Russell, EC Biles, WE TI SEMIAUTOMATED FORCES FOR CORPS BATTLE SIMULATION SO 1993 WINTER SIMULATION CONFERENCE PROCEEDINGS LA English DT Proceedings Paper CT 1993 Winter Simulation Conference CY DEC 12-15, 1993 CL LOS ANGELES, CA SP AMER STAT ASSOC, ASSOC COMP MACHINERY, SPECIAL INTEREST GRP SIMULAT, IEEE, COMP SOC, IEEE, SYST MAN & CYBERNET SOC, INST IND ENGINEERS, NIST, OPERAT RES SOC AMER, INST MANAGEMENT SCI, COLL SIMULAT, SOC COMP SIMULAT INT C1 JET PROP LAB,PASADENA,CA 91109. NR 0 TC 0 Z9 0 U1 0 U2 0 PU I E E E PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 BN 0-7803-1381-X PY 1993 BP 1057 EP 1062 PG 6 WC Computer Science, Interdisciplinary Applications; Engineering, Electrical & Electronic SC Computer Science; Engineering GA BA27E UT WOS:A1993BA27E00145 ER PT B AU DUQUETTE, WH AF DUQUETTE, WH BE Evans, GW Mollaghasemi, M Russell, EC Biles, WE TI COAST - THE CONTROLLERS ASSISTANT SO 1993 WINTER SIMULATION CONFERENCE PROCEEDINGS LA English DT Proceedings Paper CT 1993 Winter Simulation Conference CY DEC 12-15, 1993 CL LOS ANGELES, CA SP AMER STAT ASSOC, ASSOC COMP MACHINERY, SPECIAL INTEREST GRP SIMULAT, IEEE, COMP SOC, IEEE, SYST MAN & CYBERNET SOC, INST IND ENGINEERS, NIST, OPERAT RES SOC AMER, INST MANAGEMENT SCI, COLL SIMULAT, SOC COMP SIMULAT INT C1 JET PROP LAB,PASADENA,CA 91109. NR 0 TC 0 Z9 0 U1 0 U2 0 PU I E E E PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 BN 0-7803-1381-X PY 1993 BP 1063 EP 1067 PG 5 WC Computer Science, Interdisciplinary Applications; Engineering, Electrical & Electronic SC Computer Science; Engineering GA BA27E UT WOS:A1993BA27E00146 ER PT B AU DUBON, LP AF DUBON, LP BE Evans, GW Mollaghasemi, M Russell, EC Biles, WE TI JOINING A DISTRIBUTED SIMULATION ENVIRONMENT VIA ALSP SO 1993 WINTER SIMULATION CONFERENCE PROCEEDINGS LA English DT Proceedings Paper CT 1993 Winter Simulation Conference CY DEC 12-15, 1993 CL LOS ANGELES, CA SP AMER STAT ASSOC, ASSOC COMP MACHINERY, SPECIAL INTEREST GRP SIMULAT, IEEE, COMP SOC, IEEE, SYST MAN & CYBERNET SOC, INST IND ENGINEERS, NIST, OPERAT RES SOC AMER, INST MANAGEMENT SCI, COLL SIMULAT, SOC COMP SIMULAT INT C1 JET PROP LAB,PASADENA,CA 91109. NR 0 TC 0 Z9 0 U1 0 U2 0 PU I E E E PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 BN 0-7803-1381-X PY 1993 BP 1073 EP 1076 PG 4 WC Computer Science, Interdisciplinary Applications; Engineering, Electrical & Electronic SC Computer Science; Engineering GA BA27E UT WOS:A1993BA27E00148 ER PT B AU BARING, MG HARDING, AK AF BARING, MG HARDING, AK GP INT UNION PURE & APPL PHYS TI RELATIVISTIC MOTION IN GAMMA-RAY BURSTS WITH HIGH ENERGY EMISSION SO 23RD INTERNATIONAL COSMIC RAY CONFERENCE, VOL 1: CONTRIBUTED PAPERS - OG SESSIONS 1-5 LA English DT Proceedings Paper CT 23rd International Cosmic Ray Conference (XXIII ICRC) CY JUL 19-30, 1993 CL CALGARY, CANADA SP INT UNION PURE & APPL PHYS C1 NASA,GODDARD SPACE FLIGHT CTR,GREENBELT,MD 20771. RI Harding, Alice/D-3160-2012 NR 0 TC 0 Z9 0 U1 0 U2 0 PU UNIV CALGARY PR PI CALGARY PA 2500 UNIVERSITY DRIVE NW, CALGARY AB T2N 1N4, CANADA PY 1993 BP 53 EP 56 PG 4 WC Astronomy & Astrophysics; Physics, Applied; Physics, Nuclear SC Astronomy & Astrophysics; Physics GA BC03S UT WOS:A1993BC03S00014 ER PT J AU PREECE, RD KOUVELIOTOU, C BROCK, MN BRIGGS, MS PENDLETON, GN AF PREECE, RD KOUVELIOTOU, C BROCK, MN BRIGGS, MS PENDLETON, GN GP INT UNION PURE & APPL PHYS TI SPECTRAL SIMILARITIES IN HIGH-ENERGY GRBS AS SEEN BY THE BATSE LARGE AREA DETECTORS SO 23RD INTERNATIONAL COSMIC RAY CONFERENCE, VOL 1: CONTRIBUTED PAPERS - OG SESSIONS 1-5 LA English DT Proceedings Paper CT 23rd International Cosmic Ray Conference (XXIII ICRC) CY JUL 19-30, 1993 CL CALGARY, CANADA SP INT UNION PURE & APPL PHYS C1 NASA,GEORGE C MARSHALL SPACE FLIGHT CTR,ES66,HUNTSVILLE,AL 35812. NR 0 TC 0 Z9 0 U1 0 U2 0 PU UNIV CALGARY PR PI CALGARY PA 2500 UNIVERSITY DRIVE NW, CALGARY AB T2N 1N4, CANADA PY 1993 BP 73 EP 76 PG 4 WC Astronomy & Astrophysics; Physics, Applied; Physics, Nuclear SC Astronomy & Astrophysics; Physics GA BC03S UT WOS:A1993BC03S00019 ER PT J AU CLINE, TL HURLEY, KC SOMMER, M BOER, M NIEL, M FISHMAN, GJ KOUVELIOTOU, C PACIESAS, WS MEEGAN, CA WILSON, RB LAROS, JG KLEBESADEL, RW AF CLINE, TL HURLEY, KC SOMMER, M BOER, M NIEL, M FISHMAN, GJ KOUVELIOTOU, C PACIESAS, WS MEEGAN, CA WILSON, RB LAROS, JG KLEBESADEL, RW GP INT UNION PURE & APPL PHYS TI PRECISE SOURCE LOCATIONS OF RECENT GAMMA RAY BURSTS SO 23RD INTERNATIONAL COSMIC RAY CONFERENCE, VOL 1: CONTRIBUTED PAPERS - OG SESSIONS 1-5 LA English DT Proceedings Paper CT 23rd International Cosmic Ray Conference (XXIII ICRC) CY JUL 19-30, 1993 CL CALGARY, CANADA SP INT UNION PURE & APPL PHYS C1 NASA,GODDARD SPACE FLIGHT CTR,GREENBELT,MD 20771. NR 0 TC 0 Z9 0 U1 0 U2 0 PU UNIV CALGARY PR PI CALGARY PA 2500 UNIVERSITY DRIVE NW, CALGARY AB T2N 1N4, CANADA PY 1993 BP 77 EP 80 PG 4 WC Astronomy & Astrophysics; Physics, Applied; Physics, Nuclear SC Astronomy & Astrophysics; Physics GA BC03S UT WOS:A1993BC03S00020 ER PT J AU NORRIS, JP DAVIS, SP NEMIROFF, RJ KOUVELIOTOU, C FISHMAN, GJ MEEGAN, CA PACIESAS, WS AF NORRIS, JP DAVIS, SP NEMIROFF, RJ KOUVELIOTOU, C FISHMAN, GJ MEEGAN, CA PACIESAS, WS GP INT UNION PURE & APPL PHYS TI MEASUREMENTS OF SIGNATURE CONSISTENT WITH COSMOLOGICAL TIME DILATION IN GAMMA-RAY BURSTS SO 23RD INTERNATIONAL COSMIC RAY CONFERENCE, VOL 1: CONTRIBUTED PAPERS - OG SESSIONS 1-5 LA English DT Proceedings Paper CT 23rd International Cosmic Ray Conference (XXIII ICRC) CY JUL 19-30, 1993 CL CALGARY, CANADA SP INT UNION PURE & APPL PHYS C1 NASA,GODDARD SPACE FLIGHT CTR,GREENBELT,MD 20771. NR 0 TC 0 Z9 0 U1 0 U2 0 PU UNIV CALGARY PR PI CALGARY PA 2500 UNIVERSITY DRIVE NW, CALGARY AB T2N 1N4, CANADA PY 1993 BP 89 EP 92 PG 4 WC Astronomy & Astrophysics; Physics, Applied; Physics, Nuclear SC Astronomy & Astrophysics; Physics GA BC03S UT WOS:A1993BC03S00023 ER PT J AU BHAT, PN FISHMAN, GJ MEEGAN, CA WILSON, RB PACIESAS, WS AF BHAT, PN FISHMAN, GJ MEEGAN, CA WILSON, RB PACIESAS, WS GP INT UNION PURE & APPL PHYS TI MORPHOLOGICAL STUDY OF SHORT GAMMA RAY BURSTS SO 23RD INTERNATIONAL COSMIC RAY CONFERENCE, VOL 1: CONTRIBUTED PAPERS - OG SESSIONS 1-5 LA English DT Proceedings Paper CT 23rd International Cosmic Ray Conference (XXIII ICRC) CY JUL 19-30, 1993 CL CALGARY, CANADA SP INT UNION PURE & APPL PHYS C1 NASA,GEORGE C MARSHALL SPACE FLIGHT CTR,SPACE SCI LAB,HUNTSVILLE,AL 35812. NR 0 TC 0 Z9 0 U1 0 U2 0 PU UNIV CALGARY PR PI CALGARY PA 2500 UNIVERSITY DRIVE NW, CALGARY AB T2N 1N4, CANADA PY 1993 BP 97 EP 100 PG 4 WC Astronomy & Astrophysics; Physics, Applied; Physics, Nuclear SC Astronomy & Astrophysics; Physics GA BC03S UT WOS:A1993BC03S00025 ER PT B AU HUNTER, SD BERTSCH, DL DIGEL, SW DINGUS, BL FICHTEL, CE DEGEUS, EJ HARTMAN, RC KANBACH, G KNIFFEN, DA LIN, YC MATTOX, JR MAYERHASSELWANDER, HA MICHELSON, PF VONMONTIGNY, C NOLAN, PL RADECKE, HD SCHNEID, E SREEKUMAR, P THOMPSON, DJ AF HUNTER, SD BERTSCH, DL DIGEL, SW DINGUS, BL FICHTEL, CE DEGEUS, EJ HARTMAN, RC KANBACH, G KNIFFEN, DA LIN, YC MATTOX, JR MAYERHASSELWANDER, HA MICHELSON, PF VONMONTIGNY, C NOLAN, PL RADECKE, HD SCHNEID, E SREEKUMAR, P THOMPSON, DJ GP INT UNION PURE & APPL PHYS TI GAMMA RAY OBSERVATIONS OF THE OPHIUCHUS CLOUD COMPLEX WITH EGRET SO 23RD INTERNATIONAL COSMIC RAY CONFERENCE, VOL 1: CONTRIBUTED PAPERS - OG SESSIONS 1-5 LA English DT Proceedings Paper CT 23rd International Cosmic Ray Conference (XXIII ICRC) CY JUL 19-30, 1993 CL CALGARY, CANADA SP INT UNION PURE & APPL PHYS C1 NASA,GODDARD SPACE FLIGHT CTR,GREENBELT,MD 20771. RI Hunter, Stanley/D-2942-2012; Thompson, David/D-2939-2012 OI Thompson, David/0000-0001-5217-9135 NR 0 TC 0 Z9 0 U1 0 U2 0 PU UNIV CALGARY PR PI CALGARY PA 2500 UNIVERSITY DRIVE NW, CALGARY AB T2N 1N4, CANADA PY 1993 BP 140 EP 143 PG 4 WC Astronomy & Astrophysics; Physics, Applied; Physics, Nuclear SC Astronomy & Astrophysics; Physics GA BC03S UT WOS:A1993BC03S00036 ER PT B AU HARTMAN, RC BERTSCH, DL DINGUS, BL FICHTEL, CE HUNTER, SD KANBACH, G KNIFFEN, DA LIN, YC MATTOX, JR MAYERHASSELWANDER, HA MICHELSON, PF VONMONTIGNY, C NOLAN, PL SCHNEID, E SREEKUMAR, P THOMPSON, DJ AF HARTMAN, RC BERTSCH, DL DINGUS, BL FICHTEL, CE HUNTER, SD KANBACH, G KNIFFEN, DA LIN, YC MATTOX, JR MAYERHASSELWANDER, HA MICHELSON, PF VONMONTIGNY, C NOLAN, PL SCHNEID, E SREEKUMAR, P THOMPSON, DJ GP INT UNION PURE & APPL PHYS TI PRELIMINARY EGRET STUDY OF THE GALACTIC SOUTH POLAR REGION SO 23RD INTERNATIONAL COSMIC RAY CONFERENCE, VOL 1: CONTRIBUTED PAPERS - OG SESSIONS 1-5 LA English DT Proceedings Paper CT 23rd International Cosmic Ray Conference (XXIII ICRC) CY JUL 19-30, 1993 CL CALGARY, CANADA SP INT UNION PURE & APPL PHYS C1 NASA,GODDARD SPACE FLIGHT CTR,GREENBELT,MD 20771. RI Hunter, Stanley/D-2942-2012; Thompson, David/D-2939-2012 OI Thompson, David/0000-0001-5217-9135 NR 0 TC 0 Z9 0 U1 0 U2 0 PU UNIV CALGARY PR PI CALGARY PA 2500 UNIVERSITY DRIVE NW, CALGARY AB T2N 1N4, CANADA PY 1993 BP 164 EP 167 PG 4 WC Astronomy & Astrophysics; Physics, Applied; Physics, Nuclear SC Astronomy & Astrophysics; Physics GA BC03S UT WOS:A1993BC03S00043 ER PT J AU MASTICHIADIS, A PROTHEROE, RJ SZABO, AP AF MASTICHIADIS, A PROTHEROE, RJ SZABO, AP GP INT UNION PURE & APPL PHYS TI THE EFFECT OF TRIPLET PRODUCTION ON SATURATED PAIR-COMPTON CASCADES IN THERMAL RADIATION SO 23RD INTERNATIONAL COSMIC RAY CONFERENCE, VOL 1: CONTRIBUTED PAPERS - OG SESSIONS 1-5 LA English DT Proceedings Paper CT 23rd International Cosmic Ray Conference (XXIII ICRC) CY JUL 19-30, 1993 CL CALGARY, CANADA SP INT UNION PURE & APPL PHYS C1 NASA,GODDARD SPACE FLIGHT CTR,GREENBELT,MD 20771. NR 0 TC 0 Z9 0 U1 0 U2 0 PU UNIV CALGARY PR PI CALGARY PA 2500 UNIVERSITY DRIVE NW, CALGARY AB T2N 1N4, CANADA PY 1993 BP 200 EP 203 PG 4 WC Astronomy & Astrophysics; Physics, Applied; Physics, Nuclear SC Astronomy & Astrophysics; Physics GA BC03S UT WOS:A1993BC03S00052 ER PT B AU MITCHELL, JW BARBIER, LM CHRISTIAN, ER GOLDEN, RL HOI, M LABRADOR, AW MENN, W MEWALDT, RA ORMES, JF RASMUSSEN, IL REIMER, O SCHINDLER, SM SIMON, M STOCHAJ, SJ STREITMATTER, RE WEBBER, WR AF MITCHELL, JW BARBIER, LM CHRISTIAN, ER GOLDEN, RL HOI, M LABRADOR, AW MENN, W MEWALDT, RA ORMES, JF RASMUSSEN, IL REIMER, O SCHINDLER, SM SIMON, M STOCHAJ, SJ STREITMATTER, RE WEBBER, WR GP INT UNION PURE & APPL PHYS TI IMAX (ISOTOPE MATTER-ANTIMATTER EXPERIMENT) SO 23RD INTERNATIONAL COSMIC RAY CONFERENCE, VOL 1: CONTRIBUTED PAPERS - OG SESSIONS 1-5 LA English DT Proceedings Paper CT 23rd International Cosmic Ray Conference (XXIII ICRC) CY JUL 19-30, 1993 CL CALGARY, CANADA SP INT UNION PURE & APPL PHYS C1 NASA,GODDARD SPACE FLIGHT CTR,GREENBELT,MD 20771. RI Christian, Eric/D-4974-2012 OI Christian, Eric/0000-0003-2134-3937 NR 0 TC 0 Z9 0 U1 0 U2 0 PU UNIV CALGARY PR PI CALGARY PA 2500 UNIVERSITY DRIVE NW, CALGARY AB T2N 1N4, CANADA PY 1993 BP 519 EP 522 PG 4 WC Astronomy & Astrophysics; Physics, Applied; Physics, Nuclear SC Astronomy & Astrophysics; Physics GA BC03S UT WOS:A1993BC03S00138 ER PT B AU GUZIK, TG ALBERGO, S CACCIA, Z CHEN, CX COSTA, S CRAWFORD, HJ CRONQVIST, M ENGELAGE, J FERRANDO, P FLORES, I GREINER, L INSOLIA, A JONES, FC KNOTT, CN KO, S KUO, C LINDSTROM, PJ MAZOTTA, J MITCHELL, JW POTENZA, R ROMANSKI, J RUSSO, GV SOUTOUL, A SYMONS, TJM TESTARD, O TULL, CE TUVE, C WADDINGTON, CJ WEBBER, WR WEFEL, JP ZHANG, X AF GUZIK, TG ALBERGO, S CACCIA, Z CHEN, CX COSTA, S CRAWFORD, HJ CRONQVIST, M ENGELAGE, J FERRANDO, P FLORES, I GREINER, L INSOLIA, A JONES, FC KNOTT, CN KO, S KUO, C LINDSTROM, PJ MAZOTTA, J MITCHELL, JW POTENZA, R ROMANSKI, J RUSSO, GV SOUTOUL, A SYMONS, TJM TESTARD, O TULL, CE TUVE, C WADDINGTON, CJ WEBBER, WR WEFEL, JP ZHANG, X GP INT UNION PURE & APPL PHYS TI THE SENSITIVITY OF C-SI COSMIC RAY SOURCE ABUNDANCES TO THE NUCLEAR INTERACTION CROSS SECTIONS SO 23RD INTERNATIONAL COSMIC RAY CONFERENCE, VOL 1: CONTRIBUTED PAPERS - OG SESSIONS 1-5 LA English DT Proceedings Paper CT 23rd International Cosmic Ray Conference (XXIII ICRC) CY JUL 19-30, 1993 CL CALGARY, CANADA SP INT UNION PURE & APPL PHYS C1 NASA,GODDARD SPACE FLIGHT CTR,GREENBELT,MD 20771. RI Insolia, Antonio/M-3447-2015 OI Insolia, Antonio/0000-0002-9040-1566 NR 0 TC 0 Z9 0 U1 0 U2 0 PU UNIV CALGARY PR PI CALGARY PA 2500 UNIVERSITY DRIVE NW, CALGARY AB T2N 1N4, CANADA PY 1993 BP 555 EP 558 PG 4 WC Astronomy & Astrophysics; Physics, Applied; Physics, Nuclear SC Astronomy & Astrophysics; Physics GA BC03S UT WOS:A1993BC03S00147 ER PT J AU SKIBO, JG RAMATY, R AF SKIBO, JG RAMATY, R GP INT UNION PURE & APPL PHYS TI PRIMARY AND SECONDARY COSMIC RAY POSITRONS AND ELECTRONS SO 23RD INTERNATIONAL COSMIC RAY CONFERENCE, VOL 2: CONTRIBUTED PAPERS - OG SESSIONS 6-10 LA English DT Proceedings Paper CT 23rd International Cosmic Ray Conference (XXIII ICRC) CY JUL 19-30, 1993 CL CALGARY, CANADA SP INT UNION PURE & APPL PHYS C1 GSFC,HIGH ENERGY ASTROPHYS LAB,GREENBELT,MD 20771. NR 0 TC 0 Z9 0 U1 0 U2 0 PU UNIV CALGARY PR PI CALGARY PA 2500 UNIVERSITY DRIVE NW, CALGARY AB T2N 1N4, CANADA PY 1993 BP 132 EP 135 PG 4 WC Astronomy & Astrophysics; Physics, Applied; Physics, Nuclear SC Astronomy & Astrophysics; Physics GA BC03T UT WOS:A1993BC03T00036 ER PT B AU TULL, CE ALBERGO, S CACCIA, Z CHEN, CX COSTA, S CRAWFORD, HJ CRONQVIST, M ENGELAGE, J FERRANDO, P FLORES, I GREINER, L GUZIK, TG INSOLIA, A JONES, FC KNOTT, CN KO, S KUO, C LINDSTROM, PJ MAZOTTA, J MITCHELL, JW POTENZA, R ROMANSKI, J RUSSO, GV SOUTOUL, A SYMONS, TJM TESTARD, O TUVE, C WADDINGTON, CJ WEBBER, WR WEFEL, JP WU, L ZHANG, X AF TULL, CE ALBERGO, S CACCIA, Z CHEN, CX COSTA, S CRAWFORD, HJ CRONQVIST, M ENGELAGE, J FERRANDO, P FLORES, I GREINER, L GUZIK, TG INSOLIA, A JONES, FC KNOTT, CN KO, S KUO, C LINDSTROM, PJ MAZOTTA, J MITCHELL, JW POTENZA, R ROMANSKI, J RUSSO, GV SOUTOUL, A SYMONS, TJM TESTARD, O TUVE, C WADDINGTON, CJ WEBBER, WR WEFEL, JP WU, L ZHANG, X GP INT UNION PURE & APPL PHYS TI ENERGY DEPENDENCE OF ISOTOPIC PRODUCTION CROSS SECTIONS FROM PROJECTILE FRAGMENTATION OF S-32 SO 23RD INTERNATIONAL COSMIC RAY CONFERENCE, VOL 2: CONTRIBUTED PAPERS - OG SESSIONS 6-10 LA English DT Proceedings Paper CT 23rd International Cosmic Ray Conference (XXIII ICRC) CY JUL 19-30, 1993 CL CALGARY, CANADA SP INT UNION PURE & APPL PHYS C1 NASA,GODDARD SPACE FLIGHT CTR,GREENBELT,MD 20771. RI Insolia, Antonio/M-3447-2015 OI Insolia, Antonio/0000-0002-9040-1566 NR 0 TC 0 Z9 0 U1 0 U2 0 PU UNIV CALGARY PR PI CALGARY PA 2500 UNIVERSITY DRIVE NW, CALGARY AB T2N 1N4, CANADA PY 1993 BP 163 EP 166 PG 4 WC Astronomy & Astrophysics; Physics, Applied; Physics, Nuclear SC Astronomy & Astrophysics; Physics GA BC03T UT WOS:A1993BC03T00044 ER PT J AU BARING, MG ELLISON, DC JONES, FC AF BARING, MG ELLISON, DC JONES, FC GP INT UNION PURE & APPL PHYS TI FEATURES FROM MONTE CARLO SIMULATIONS OF PARTICLE ACCELERATION AT OBLIQUE SHOCKS SO 23RD INTERNATIONAL COSMIC RAY CONFERENCE, VOL 2: CONTRIBUTED PAPERS - OG SESSIONS 6-10 LA English DT Proceedings Paper CT 23rd International Cosmic Ray Conference (XXIII ICRC) CY JUL 19-30, 1993 CL CALGARY, CANADA SP INT UNION PURE & APPL PHYS C1 NASA,GODDARD SPACE FLIGHT CTR,GREENBELT,MD 20771. NR 0 TC 0 Z9 0 U1 0 U2 0 PU UNIV CALGARY PR PI CALGARY PA 2500 UNIVERSITY DRIVE NW, CALGARY AB T2N 1N4, CANADA PY 1993 BP 207 EP 210 PG 4 WC Astronomy & Astrophysics; Physics, Applied; Physics, Nuclear SC Astronomy & Astrophysics; Physics GA BC03T UT WOS:A1993BC03T00055 ER PT B AU HARDING, AK JONES, FC DEJAGER, OC AF HARDING, AK JONES, FC DEJAGER, OC GP INT UNION PURE & APPL PHYS TI CROSS-FIELD DIFFUSION AND SHOCK ACCELERATION IN PULSAR WINDS SO 23RD INTERNATIONAL COSMIC RAY CONFERENCE, VOL 2: CONTRIBUTED PAPERS - OG SESSIONS 6-10 LA English DT Proceedings Paper CT 23rd International Cosmic Ray Conference (XXIII ICRC) CY JUL 19-30, 1993 CL CALGARY, CANADA SP INT UNION PURE & APPL PHYS C1 NASA,GODDARD SPACE FLIGHT CTR,GREENBELT,MD 20771. RI Harding, Alice/D-3160-2012 NR 0 TC 0 Z9 0 U1 0 U2 0 PU UNIV CALGARY PR PI CALGARY PA 2500 UNIVERSITY DRIVE NW, CALGARY AB T2N 1N4, CANADA PY 1993 BP 239 EP 242 PG 4 WC Astronomy & Astrophysics; Physics, Applied; Physics, Nuclear SC Astronomy & Astrophysics; Physics GA BC03T UT WOS:A1993BC03T00063 ER PT J AU JONES, FC BARING, MG ELLISON, DC AF JONES, FC BARING, MG ELLISON, DC GP INT UNION PURE & APPL PHYS TI MODELING CROSS FIELD DIFFUSION IN MONTE CARLO CALCULATIONS OF SHOCK ACCELERATION SO 23RD INTERNATIONAL COSMIC RAY CONFERENCE, VOL 2: CONTRIBUTED PAPERS - OG SESSIONS 6-10 LA English DT Proceedings Paper CT 23rd International Cosmic Ray Conference (XXIII ICRC) CY JUL 19-30, 1993 CL CALGARY, CANADA SP INT UNION PURE & APPL PHYS C1 NASA,GODDARD SPACE FLIGHT CTR,GREENBELT,MD 20771. NR 0 TC 0 Z9 0 U1 0 U2 0 PU UNIV CALGARY PR PI CALGARY PA 2500 UNIVERSITY DRIVE NW, CALGARY AB T2N 1N4, CANADA PY 1993 BP 243 EP 246 PG 4 WC Astronomy & Astrophysics; Physics, Applied; Physics, Nuclear SC Astronomy & Astrophysics; Physics GA BC03T UT WOS:A1993BC03T00064 ER PT J AU MACE, RL JONES, FC AF MACE, RL JONES, FC GP INT UNION PURE & APPL PHYS TI PARTICLE ACCELERATION AT SHOCKS IN PAIR PLASMAS - SOME PLASMA PHYSICAL CONSIDERATIONS SO 23RD INTERNATIONAL COSMIC RAY CONFERENCE, VOL 2: CONTRIBUTED PAPERS - OG SESSIONS 6-10 LA English DT Proceedings Paper CT 23rd International Cosmic Ray Conference (XXIII ICRC) CY JUL 19-30, 1993 CL CALGARY, CANADA SP INT UNION PURE & APPL PHYS C1 NASA,GODDARD SPACE FLIGHT CTR,HIGH ENERGY ASTROPHYS LAB,GREENBELT,MD 20771. NR 0 TC 0 Z9 0 U1 0 U2 0 PU UNIV CALGARY PR PI CALGARY PA 2500 UNIVERSITY DRIVE NW, CALGARY AB T2N 1N4, CANADA PY 1993 BP 247 EP 250 PG 4 WC Astronomy & Astrophysics; Physics, Applied; Physics, Nuclear SC Astronomy & Astrophysics; Physics GA BC03T UT WOS:A1993BC03T00065 ER PT J AU DERRICKSON, JH EBY, PB FOUNTAIN, WF PARNELL, TA WATTS, JW MOON, KH KING, DT GREGORY, JC TAKAHASHI, Y OGATA, T AF DERRICKSON, JH EBY, PB FOUNTAIN, WF PARNELL, TA WATTS, JW MOON, KH KING, DT GREGORY, JC TAKAHASHI, Y OGATA, T GP INT UNION PURE & APPL PHYS TI DIRECT ELECTRON PAIRS ALONG HEAVY ION TRACKS SO 23RD INTERNATIONAL COSMIC RAY CONFERENCE, VOL 2: CONTRIBUTED PAPERS - OG SESSIONS 6-10 LA English DT Proceedings Paper CT 23rd International Cosmic Ray Conference (XXIII ICRC) CY JUL 19-30, 1993 CL CALGARY, CANADA SP INT UNION PURE & APPL PHYS C1 NASA,GEORGE C MARSHALL SPACE FLIGHT CTR,SSL,HUNTSVILLE,AL 35812. NR 0 TC 0 Z9 0 U1 0 U2 0 PU UNIV CALGARY PR PI CALGARY PA 2500 UNIVERSITY DRIVE NW, CALGARY AB T2N 1N4, CANADA PY 1993 BP 540 EP 543 PG 4 WC Astronomy & Astrophysics; Physics, Applied; Physics, Nuclear SC Astronomy & Astrophysics; Physics GA BC03T UT WOS:A1993BC03T00141 ER PT B AU WHEATON, WA DIXON, DD TUMER, OT ZYCH, AD AF WHEATON, WA DIXON, DD TUMER, OT ZYCH, AD GP INT UNION PURE & APPL PHYS TI LEAST-SQUARES DECONVOLUTION OF COMPTON TELESCOPE DATA WITH THE POSITIVITY CONSTRAINT SO 23RD INTERNATIONAL COSMIC RAY CONFERENCE, VOL 2: CONTRIBUTED PAPERS - OG SESSIONS 6-10 LA English DT Proceedings Paper CT 23rd International Cosmic Ray Conference (XXIII ICRC) CY JUL 19-30, 1993 CL CALGARY, CANADA SP INT UNION PURE & APPL PHYS C1 JET PROP LAB,PASADENA,CA 91109. NR 0 TC 0 Z9 0 U1 0 U2 1 PU UNIV CALGARY PR PI CALGARY PA 2500 UNIVERSITY DRIVE NW, CALGARY AB T2N 1N4, CANADA PY 1993 BP 560 EP 563 PG 4 WC Astronomy & Astrophysics; Physics, Applied; Physics, Nuclear SC Astronomy & Astrophysics; Physics GA BC03T UT WOS:A1993BC03T00146 ER PT B AU STREITMATTER, RE BARBIER, LM BREMERICH, M CHRISTIAN, ER HOF, M KROMBEL, KE MENN, W MEWALDT, RA MITCHELL, JW ORMES, JF RASMUSSEN, IL SCHINDLER, SM SIMON, M AF STREITMATTER, RE BARBIER, LM BREMERICH, M CHRISTIAN, ER HOF, M KROMBEL, KE MENN, W MEWALDT, RA MITCHELL, JW ORMES, JF RASMUSSEN, IL SCHINDLER, SM SIMON, M GP INT UNION PURE & APPL PHYS TI ISOMAX - A BALLOON-BORNE INSTRUMENT TO STUDY BERYLLIUM AND OTHER LIGHT ISOTOPES IN THE COSMIC RADIATION SO 23RD INTERNATIONAL COSMIC RAY CONFERENCE, VOL 2: CONTRIBUTED PAPERS - OG SESSIONS 6-10 LA English DT Proceedings Paper CT 23rd International Cosmic Ray Conference (XXIII ICRC) CY JUL 19-30, 1993 CL CALGARY, CANADA SP INT UNION PURE & APPL PHYS C1 NASA,GODDARD SPACE FLIGHT CTR,GREENBELT,MD 20771. RI Christian, Eric/D-4974-2012 OI Christian, Eric/0000-0003-2134-3937 NR 0 TC 0 Z9 0 U1 0 U2 0 PU UNIV CALGARY PR PI CALGARY PA 2500 UNIVERSITY DRIVE NW, CALGARY AB T2N 1N4, CANADA PY 1993 BP 623 EP 626 PG 4 WC Astronomy & Astrophysics; Physics, Applied; Physics, Nuclear SC Astronomy & Astrophysics; Physics GA BC03T UT WOS:A1993BC03T00162 ER PT B AU MITCHELL, JW BARBIER, LM CHRISTIAN, ER HOF, M HOLDER, SF LABRADOR, AW MENN, W ORMES, JF REIMER, O RIGHTER, DL SIMON, M STOCHAJ, SJ STREITMATTER, RE AF MITCHELL, JW BARBIER, LM CHRISTIAN, ER HOF, M HOLDER, SF LABRADOR, AW MENN, W ORMES, JF REIMER, O RIGHTER, DL SIMON, M STOCHAJ, SJ STREITMATTER, RE GP INT UNION PURE & APPL PHYS TI THE ISOTOPE MATTER-ANTIMATTER EXPERIMENT TIME-OF-FLIGHT SYSTEM SO 23RD INTERNATIONAL COSMIC RAY CONFERENCE, VOL 2: CONTRIBUTED PAPERS - OG SESSIONS 6-10 LA English DT Proceedings Paper CT 23rd International Cosmic Ray Conference (XXIII ICRC) CY JUL 19-30, 1993 CL CALGARY, CANADA SP INT UNION PURE & APPL PHYS C1 NASA,GODDARD SPACE FLIGHT CTR,GREENBELT,MD 20771. RI Christian, Eric/D-4974-2012 OI Christian, Eric/0000-0003-2134-3937 NR 0 TC 0 Z9 0 U1 0 U2 0 PU UNIV CALGARY PR PI CALGARY PA 2500 UNIVERSITY DRIVE NW, CALGARY AB T2N 1N4, CANADA PY 1993 BP 627 EP 630 PG 4 WC Astronomy & Astrophysics; Physics, Applied; Physics, Nuclear SC Astronomy & Astrophysics; Physics GA BC03T UT WOS:A1993BC03T00163 ER PT J AU MILLER, JA VINAS, AF REAMES, DV AF MILLER, JA VINAS, AF REAMES, DV GP UNIV CALGARY TI SELECTIVE HE-3 AND FE ACCELERATION IN IMPULSIVE SOLAR FLARES SO 23RD INTERNATIONAL COSMIC RAY CONFERENCE, VOL 3: CONTRIBUTED PAPERS - SH SESSIONS LA English DT Proceedings Paper CT 23rd International Cosmic Ray Conference (XXIII ICRC) CY JUL 19-30, 1993 CL CALGARY, CANADA SP INT UNION PURE & APPL PHYS C1 NASA,GODDARD SPACE FLIGHT CTR,GREENBELT,MD 20771. NR 0 TC 0 Z9 0 U1 0 U2 0 PU UNIV CALGARY PR PI CALGARY PA 2500 UNIVERSITY DRIVE NW, CALGARY AB T2N 1N4, CANADA PY 1993 BP 13 EP 16 PG 4 WC Astronomy & Astrophysics; Geosciences, Multidisciplinary SC Astronomy & Astrophysics; Geology GA BC09G UT WOS:A1993BC09G00004 ER PT B AU MILLER, JA VINAS, AF REAMES, DV AF MILLER, JA VINAS, AF REAMES, DV GP UNIV CALGARY TI HEAVY ION ACCELERATION AND ABUNDANCE ENHANCEMENTS IN IMPULSIVE SOLAR FLARES SO 23RD INTERNATIONAL COSMIC RAY CONFERENCE, VOL 3: CONTRIBUTED PAPERS - SH SESSIONS LA English DT Proceedings Paper CT 23rd International Cosmic Ray Conference (XXIII ICRC) CY JUL 19-30, 1993 CL CALGARY, CANADA SP INT UNION PURE & APPL PHYS RP MILLER, JA (reprint author), NASA,GODDARD SPACE FLIGHT CTR,GREENBELT,MD 20771, USA. NR 0 TC 0 Z9 0 U1 0 U2 1 PU UNIV CALGARY PR PI CALGARY PA 2500 UNIVERSITY DRIVE NW, CALGARY AB T2N 1N4, CANADA PY 1993 BP 17 EP 20 PG 4 WC Astronomy & Astrophysics; Geosciences, Multidisciplinary SC Astronomy & Astrophysics; Geology GA BC09G UT WOS:A1993BC09G00005 ER PT J AU MANDZHAVIDZE, N RAMATY, R AKIMOV, VV LEIKOV, NG AF MANDZHAVIDZE, N RAMATY, R AKIMOV, VV LEIKOV, NG GP UNIV CALGARY TI PION DECAY AND NUCLEAR LINE EMISSION FROM THE 1991 JUNE 15 FLARE SO 23RD INTERNATIONAL COSMIC RAY CONFERENCE, VOL 3: CONTRIBUTED PAPERS - SH SESSIONS LA English DT Proceedings Paper CT 23rd International Cosmic Ray Conference (XXIII ICRC) CY JUL 19-30, 1993 CL CALGARY, CANADA SP INT UNION PURE & APPL PHYS C1 NASA,GODDARD SPACE FLIGHT CTR,GSFC,GREENBELT,MD 20771. NR 0 TC 0 Z9 0 U1 0 U2 0 PU UNIV CALGARY PR PI CALGARY PA 2500 UNIVERSITY DRIVE NW, CALGARY AB T2N 1N4, CANADA PY 1993 BP 119 EP 122 PG 4 WC Astronomy & Astrophysics; Geosciences, Multidisciplinary SC Astronomy & Astrophysics; Geology GA BC09G UT WOS:A1993BC09G00030 ER PT J AU BARBIER, LM REAMES, DV VONROSENVINGE, TT AF BARBIER, LM REAMES, DV VONROSENVINGE, TT GP UNIV CALGARY TI THE EPACT EXPERIMENT SO 23RD INTERNATIONAL COSMIC RAY CONFERENCE, VOL 3: CONTRIBUTED PAPERS - SH SESSIONS LA English DT Proceedings Paper CT 23rd International Cosmic Ray Conference (XXIII ICRC) CY JUL 19-30, 1993 CL CALGARY, CANADA SP INT UNION PURE & APPL PHYS C1 NASA,GODDARD SPACE FLIGHT CTR,GSFC,GREENBELT,MD 20771. NR 0 TC 0 Z9 0 U1 0 U2 0 PU UNIV CALGARY PR PI CALGARY PA 2500 UNIVERSITY DRIVE NW, CALGARY AB T2N 1N4, CANADA PY 1993 BP 222 EP 225 PG 4 WC Astronomy & Astrophysics; Geosciences, Multidisciplinary SC Astronomy & Astrophysics; Geology GA BC09G UT WOS:A1993BC09G00056 ER PT J AU RICHARDSON, IG WINTERHALTER, D AF RICHARDSON, IG WINTERHALTER, D GP UNIV CALGARY TI ENERGETIC ION AND MAGNETIC FIELD OBSERVATIONS AT THE ICE SPACECRAFT OFF THE WEST LIMB OF THE SUN IN LATE-AUGUST 1989 SO 23RD INTERNATIONAL COSMIC RAY CONFERENCE, VOL 3: CONTRIBUTED PAPERS - SH SESSIONS LA English DT Proceedings Paper CT 23rd International Cosmic Ray Conference (XXIII ICRC) CY JUL 19-30, 1993 CL CALGARY, CANADA SP INT UNION PURE & APPL PHYS C1 NASA,GODDARD SPACE FLIGHT CTR,HIGH ENERGY ASTROPHYS LAB,GREENBELT,MD 20771. NR 0 TC 0 Z9 0 U1 0 U2 0 PU UNIV CALGARY PR PI CALGARY PA 2500 UNIVERSITY DRIVE NW, CALGARY AB T2N 1N4, CANADA PY 1993 BP 226 EP 229 PG 4 WC Astronomy & Astrophysics; Geosciences, Multidisciplinary SC Astronomy & Astrophysics; Geology GA BC09G UT WOS:A1993BC09G00057 ER PT J AU RICHARDSON, IG CANE, HV AF RICHARDSON, IG CANE, HV GP UNIV CALGARY TI THE RELATIONSHIP BETWEEN ENERGETIC PARTICLE AND SOLAR WIND PLASMA SHOCK DRIVER SIGNATURES AND THE SOLAR SOURCE LONGITUDE SO 23RD INTERNATIONAL COSMIC RAY CONFERENCE, VOL 3: CONTRIBUTED PAPERS - SH SESSIONS LA English DT Proceedings Paper CT 23rd International Cosmic Ray Conference (XXIII ICRC) CY JUL 19-30, 1993 CL CALGARY, CANADA SP INT UNION PURE & APPL PHYS C1 NASA,GODDARD SPACE FLIGHT CTR,HIGH ENERGY ASTROPHYS LAB,GREENBELT,MD 20771. NR 0 TC 0 Z9 0 U1 0 U2 0 PU UNIV CALGARY PR PI CALGARY PA 2500 UNIVERSITY DRIVE NW, CALGARY AB T2N 1N4, CANADA PY 1993 BP 230 EP 233 PG 4 WC Astronomy & Astrophysics; Geosciences, Multidisciplinary SC Astronomy & Astrophysics; Geology GA BC09G UT WOS:A1993BC09G00058 ER PT J AU PAGE, DE BAME, SJ GOLDSTEIN, BG AF PAGE, DE BAME, SJ GOLDSTEIN, BG GP UNIV CALGARY TI SOLAR WIND CHANNELS FOR MEV PARTICLES SO 23RD INTERNATIONAL COSMIC RAY CONFERENCE, VOL 3: CONTRIBUTED PAPERS - SH SESSIONS LA English DT Proceedings Paper CT 23rd International Cosmic Ray Conference (XXIII ICRC) CY JUL 19-30, 1993 CL CALGARY, CANADA SP INT UNION PURE & APPL PHYS C1 JPL,ESA ULYSSES OFF,PASADENA,CA 91109. NR 0 TC 0 Z9 0 U1 0 U2 0 PU UNIV CALGARY PR PI CALGARY PA 2500 UNIVERSITY DRIVE NW, CALGARY AB T2N 1N4, CANADA PY 1993 BP 258 EP 261 PG 4 WC Astronomy & Astrophysics; Geosciences, Multidisciplinary SC Astronomy & Astrophysics; Geology GA BC09G UT WOS:A1993BC09G00065 ER PT J AU RICHARDSON, IG CANE, HV AF RICHARDSON, IG CANE, HV GP UNIV CALGARY TI ARE POST-SHOCK BIDIRECTIONAL PARTICLE FLOWS UNIQUELY ASSOCIATED WITH SHOCK DRIVERS SO 23RD INTERNATIONAL COSMIC RAY CONFERENCE, VOL 3: CONTRIBUTED PAPERS - SH SESSIONS LA English DT Proceedings Paper CT 23rd International Cosmic Ray Conference (XXIII ICRC) CY JUL 19-30, 1993 CL CALGARY, CANADA SP INT UNION PURE & APPL PHYS C1 NASA,GODDARD SPACE FLIGHT CTR,HIGH ENERGY ASTROPHYS LAB,GREENBELT,MD 20771. NR 0 TC 0 Z9 0 U1 0 U2 0 PU UNIV CALGARY PR PI CALGARY PA 2500 UNIVERSITY DRIVE NW, CALGARY AB T2N 1N4, CANADA PY 1993 BP 282 EP 285 PG 4 WC Astronomy & Astrophysics; Geosciences, Multidisciplinary SC Astronomy & Astrophysics; Geology GA BC09G UT WOS:A1993BC09G00071 ER PT J AU REAMES, DV AF REAMES, DV GP UNIV CALGARY TI MEAN ELEMENT ABUNDANCES IN ENERGETIC PARTICLES FROM IMPULSIVE SOLAR FLARES SO 23RD INTERNATIONAL COSMIC RAY CONFERENCE, VOL 3: CONTRIBUTED PAPERS - SH SESSIONS LA English DT Proceedings Paper CT 23rd International Cosmic Ray Conference (XXIII ICRC) CY JUL 19-30, 1993 CL CALGARY, CANADA SP INT UNION PURE & APPL PHYS C1 NASA,GODDARD SPACE FLIGHT CTR,GREENBELT,MD 20771. NR 0 TC 0 Z9 0 U1 0 U2 0 PU UNIV CALGARY PR PI CALGARY PA 2500 UNIVERSITY DRIVE NW, CALGARY AB T2N 1N4, CANADA PY 1993 BP 388 EP 391 PG 4 WC Astronomy & Astrophysics; Geosciences, Multidisciplinary SC Astronomy & Astrophysics; Geology GA BC09G UT WOS:A1993BC09G00099 ER PT J AU VONROSENVIGE, TT BARBIER, LM REAMES, DV AF VONROSENVIGE, TT BARBIER, LM REAMES, DV GP UNIV CALGARY TI AN ON-BOARD PARTICLE IDENTIFICATION ALGORITHM FOR THE WIND SPACECRAFT SO 23RD INTERNATIONAL COSMIC RAY CONFERENCE, VOL 3: CONTRIBUTED PAPERS - SH SESSIONS LA English DT Proceedings Paper CT 23rd International Cosmic Ray Conference (XXIII ICRC) CY JUL 19-30, 1993 CL CALGARY, CANADA SP INT UNION PURE & APPL PHYS C1 NASA,GODDARD SPACE FLIGHT CTR,GREENBELT,MD 20771. NR 0 TC 0 Z9 0 U1 0 U2 0 PU UNIV CALGARY PR PI CALGARY PA 2500 UNIVERSITY DRIVE NW, CALGARY AB T2N 1N4, CANADA PY 1993 BP 400 EP 403 PG 4 WC Astronomy & Astrophysics; Geosciences, Multidisciplinary SC Astronomy & Astrophysics; Geology GA BC09G UT WOS:A1993BC09G00102 ER PT J AU BADHWAR, GD ONEILL, PM AF BADHWAR, GD ONEILL, PM GP UNIV CALGARY TI TIME LAG OF 22 YEAR SOLAR MODULATION SO 23RD INTERNATIONAL COSMIC RAY CONFERENCE, VOL 3: CONTRIBUTED PAPERS - SH SESSIONS LA English DT Proceedings Paper CT 23rd International Cosmic Ray Conference (XXIII ICRC) CY JUL 19-30, 1993 CL CALGARY, CANADA SP INT UNION PURE & APPL PHYS C1 NASA,LYNDON B JOHNSON SPACE CTR,HOUSTON,TX 77058. NR 0 TC 1 Z9 1 U1 0 U2 0 PU UNIV CALGARY PR PI CALGARY PA 2500 UNIVERSITY DRIVE NW, CALGARY AB T2N 1N4, CANADA PY 1993 BP 535 EP 538 PG 4 WC Astronomy & Astrophysics; Geosciences, Multidisciplinary SC Astronomy & Astrophysics; Geology GA BC09G UT WOS:A1993BC09G00140 ER PT J AU RODRIGUES, DJ AF RODRIGUES, DJ GP SOC FLIGHT TEST ENGINEERS TI THE X31 TEAM - CONQUERING POST STALL SO 24TH ANNUAL SYMPOSIUM OF THE SOCIETY OF FLIGHT TEST ENGINEERS, PROCEEDINGS SE PROCEEDINGS - ANNUAL SYMPOSIUM OF THE SOCIETY OF FLIGHT TEST ENGINEERS LA English DT Proceedings Paper CT 24th Annual Symposium of the Society-of-Flight-Test-Engineers CY JUL, 1993 CL SEATTLE, WA SP SOC FLIGHT TEST ENGINEERS, SEATTLE CHAPTER C1 ROCKWELL INT CORP,NASA,DRYDEN FLIGHT RES FACIL,EDWARDS AFB,CA 93523. NR 0 TC 0 Z9 0 U1 0 U2 0 PU SOC FLIGHT TEST ENGINEERS PI LANCASTER PA P.O. BOX 4047, LANCASTER, CA 93534 SN 1050-9690 J9 PROC ANN SYMP SFTE PY 1993 BP 43 EP 52 PG 10 WC Engineering, Aerospace SC Engineering GA BC03X UT WOS:A1993BC03X00005 ER PT J AU LEWIS, MS AF LEWIS, MS GP SOC FLIGHT TEST ENGINEERS TI DESIGN AND CONDUCT OF A WIND SHEAR DETECTION FLIGHT EXPERIMENT SO 24TH ANNUAL SYMPOSIUM OF THE SOCIETY OF FLIGHT TEST ENGINEERS, PROCEEDINGS SE PROCEEDINGS - ANNUAL SYMPOSIUM OF THE SOCIETY OF FLIGHT TEST ENGINEERS LA English DT Proceedings Paper CT 24th Annual Symposium of the Society-of-Flight-Test-Engineers CY JUL, 1993 CL SEATTLE, WA SP SOC FLIGHT TEST ENGINEERS, SEATTLE CHAPTER C1 NASA,LANGLEY RES CTR,HAMPTON,VA 23681. NR 0 TC 0 Z9 0 U1 0 U2 0 PU SOC FLIGHT TEST ENGINEERS PI LANCASTER PA P.O. BOX 4047, LANCASTER, CA 93534 SN 1050-9690 J9 PROC ANN SYMP SFTE PY 1993 BP 237 EP 254 PG 18 WC Engineering, Aerospace SC Engineering GA BC03X UT WOS:A1993BC03X00022 ER PT S AU DENSMORE, A JAMNEJAD, V AF DENSMORE, A JAMNEJAD, V GP INST ELECT ENGINEERS TI K-BAND AND KA-BAND, SATELLITE-TRACKING, SMALL REFLECTOR VEHICULAR ANTENNA SYSTEM FOR MOBILE SATELLITE SERVICE SO 3RD EUROPEAN CONFERENCE ON SATELLITE COMMUNICATIONS SE IEE CONFERENCE PUBLICATIONS LA English DT Proceedings Paper CT 3rd European Conference on Satellite Communications CY NOV 02-04, 1993 CL MANCHESTER CONF CTR, MANCHESTER, ENGLAND SP INST ELECT ENGINEERS, ELECTR DIV, EUREL, ESA, SEE HO MANCHESTER CONF CTR C1 JET PROP LAB,PASADENA,CA 91109. NR 0 TC 0 Z9 0 U1 0 U2 0 PU INST ELECTRICAL ENGINEERS PI STEVENAGE HERTS PA PO BOX 8, SOUTHGATE HOUSE, STEVENAGE HERTS, ENGLAND SG1 1HQ SN 0537-9989 BN 0-85296-603-2 J9 IEE CONF PUBL PY 1993 IS 381 BP 117 EP 121 PG 5 WC Engineering, Electrical & Electronic; Telecommunications SC Engineering; Telecommunications GA BA39B UT WOS:A1993BA39B00024 ER PT J AU FLOOD, DJ AF FLOOD, DJ GP 7TH INT PVSEC ORGANIZING COMM TI ADVANCED SOLAR CELL AND ARRAY TECHNOLOGY FOR SPACE APPLICATIONS SO 7TH INTERNATIONAL PHOTOVOLTAIC SCIENCE AND ENGINEERING CONFERENCE, TECHNICAL DIGEST LA English DT Proceedings Paper CT 7th International Photovoltaic Science and Engineering Conference (PVSEC-7) CY NOV 22-26, 1993 CL NAGOYA, JAPAN SP Japan Soc Appl Phys, Inst Elect Engineers Japan, Nagoya Ind Sci Res Inst, Chem Soc Japan, Electrochem Soc Japan, Illuminating Engn Inst Japan, IEEE, Electron Devices Soc, Inst Electr Informat & Commun Engineers, Inst Televis Engineers Japan, Int Solar Energy Soc, Japanese Sect, Japan Soc Aeronaut & Space Sci, Japan Soc Direct Energy Convers, Japan Solar Energy Soc, Commiss EC, Photovoltaic Div C1 NASA,LEWIS RES CTR,CLEVELAND,OH 44135. NR 0 TC 0 Z9 0 U1 0 U2 0 PU INTERNATIONAL PVSEC-7 PI NAGOYA 466 PA C/O MASAYOSHI UMENO DEPT ELECT & COMP ENGN NAGOYA INST TECH, NAGOYA 466 JAPAN PY 1993 BP 403 EP 406 PG 4 WC Energy & Fuels; Engineering, Electrical & Electronic; Physics, Applied SC Energy & Fuels; Engineering; Physics GA BB94Z UT WOS:A1993BB94Z00134 ER PT J AU JAIN, RK FLOOD, DJ AF JAIN, RK FLOOD, DJ GP 7TH INT PVSEC ORGANIZING COMM TI EFFECTS OF SURFACE RECOMBINATION VELOCITY AND MINORITY CARRIER DIFFUSION LENGTH IN P+N INDIUM PHOSPHIDE SOLAR CELLS SO 7TH INTERNATIONAL PHOTOVOLTAIC SCIENCE AND ENGINEERING CONFERENCE, TECHNICAL DIGEST LA English DT Proceedings Paper CT 7th International Photovoltaic Science and Engineering Conference (PVSEC-7) CY NOV 22-26, 1993 CL NAGOYA, JAPAN SP Japan Soc Appl Phys, Inst Elect Engineers Japan, Nagoya Ind Sci Res Inst, Chem Soc Japan, Electrochem Soc Japan, Illuminating Engn Inst Japan, IEEE, Electron Devices Soc, Inst Electr Informat & Commun Engineers, Inst Televis Engineers Japan, Int Solar Energy Soc, Japanese Sect, Japan Soc Aeronaut & Space Sci, Japan Soc Direct Energy Convers, Japan Solar Energy Soc, Commiss EC, Photovoltaic Div C1 NASA,LEWIS RES CTR,CLEVELAND,OH 44135. NR 0 TC 0 Z9 0 U1 0 U2 0 PU INTERNATIONAL PVSEC-7 PI NAGOYA 466 PA C/O MASAYOSHI UMENO DEPT ELECT & COMP ENGN NAGOYA INST TECH, NAGOYA 466 JAPAN PY 1993 BP 473 EP 474 PG 2 WC Energy & Fuels; Engineering, Electrical & Electronic; Physics, Applied SC Energy & Fuels; Engineering; Physics GA BB94Z UT WOS:A1993BB94Z00163 ER PT J AU JAIN, RK WEINBERG, I AF JAIN, RK WEINBERG, I GP 7TH INT PVSEC ORGANIZING COMM TI PROTON DAMAGE COEFFICIENT FOR INP/GAAS SOLAR CELLS SO 7TH INTERNATIONAL PHOTOVOLTAIC SCIENCE AND ENGINEERING CONFERENCE, TECHNICAL DIGEST LA English DT Proceedings Paper CT 7th International Photovoltaic Science and Engineering Conference (PVSEC-7) CY NOV 22-26, 1993 CL NAGOYA, JAPAN SP Japan Soc Appl Phys, Inst Elect Engineers Japan, Nagoya Ind Sci Res Inst, Chem Soc Japan, Electrochem Soc Japan, Illuminating Engn Inst Japan, IEEE, Electron Devices Soc, Inst Electr Informat & Commun Engineers, Inst Televis Engineers Japan, Int Solar Energy Soc, Japanese Sect, Japan Soc Aeronaut & Space Sci, Japan Soc Direct Energy Convers, Japan Solar Energy Soc, Commiss EC, Photovoltaic Div C1 NASA,LEWIS RES CTR,CLEVELAND,OH 44135. NR 0 TC 0 Z9 0 U1 0 U2 0 PU INTERNATIONAL PVSEC-7 PI NAGOYA 466 PA C/O MASAYOSHI UMENO DEPT ELECT & COMP ENGN NAGOYA INST TECH, NAGOYA 466 JAPAN PY 1993 BP 567 EP 568 PG 2 WC Energy & Fuels; Engineering, Electrical & Electronic; Physics, Applied SC Energy & Fuels; Engineering; Physics GA BB94Z UT WOS:A1993BB94Z00200 ER PT J AU JAIN, RK FLOOD, DJ AF JAIN, RK FLOOD, DJ GP 7TH INT PVSEC ORGANIZING COMM TI SIMULATION OF HIGH EFFICIENCY N+P INDIUM PHOSPHIDE SOLAR CELL RESULTS AND FUTURE IMPROVEMENTS SO 7TH INTERNATIONAL PHOTOVOLTAIC SCIENCE AND ENGINEERING CONFERENCE, TECHNICAL DIGEST LA English DT Proceedings Paper CT 7th International Photovoltaic Science and Engineering Conference (PVSEC-7) CY NOV 22-26, 1993 CL NAGOYA, JAPAN SP Japan Soc Appl Phys, Inst Elect Engineers Japan, Nagoya Ind Sci Res Inst, Chem Soc Japan, Electrochem Soc Japan, Illuminating Engn Inst Japan, IEEE, Electron Devices Soc, Inst Electr Informat & Commun Engineers, Inst Televis Engineers Japan, Int Solar Energy Soc, Japanese Sect, Japan Soc Aeronaut & Space Sci, Japan Soc Direct Energy Convers, Japan Solar Energy Soc, Commiss EC, Photovoltaic Div C1 NASA,LEWIS RES CTR,CLEVELAND,OH 44135. NR 0 TC 0 Z9 0 U1 0 U2 0 PU INTERNATIONAL PVSEC-7 PI NAGOYA 466 PA C/O MASAYOSHI UMENO DEPT ELECT & COMP ENGN NAGOYA INST TECH, NAGOYA 466 JAPAN PY 1993 BP 577 EP 578 PG 2 WC Energy & Fuels; Engineering, Electrical & Electronic; Physics, Applied SC Energy & Fuels; Engineering; Physics GA BB94Z UT WOS:A1993BB94Z00204 ER PT J AU LANDIS, GA AF LANDIS, GA GP 7TH INT PVSEC ORGANIZING COMM TI EFFECT OF DUST DEPOSITION ON PERFORMANCE OF SOLAR ARRAYS ON MARS SO 7TH INTERNATIONAL PHOTOVOLTAIC SCIENCE AND ENGINEERING CONFERENCE, TECHNICAL DIGEST LA English DT Proceedings Paper CT 7th International Photovoltaic Science and Engineering Conference (PVSEC-7) CY NOV 22-26, 1993 CL NAGOYA, JAPAN SP Japan Soc Appl Phys, Inst Elect Engineers Japan, Nagoya Ind Sci Res Inst, Chem Soc Japan, Electrochem Soc Japan, Illuminating Engn Inst Japan, IEEE, Electron Devices Soc, Inst Electr Informat & Commun Engineers, Inst Televis Engineers Japan, Int Solar Energy Soc, Japanese Sect, Japan Soc Aeronaut & Space Sci, Japan Soc Direct Energy Convers, Japan Solar Energy Soc, Commiss EC, Photovoltaic Div C1 NASA,LEWIS RES CTR,CLEVELAND,OH 44135. NR 0 TC 0 Z9 0 U1 0 U2 0 PU INTERNATIONAL PVSEC-7 PI NAGOYA 466 PA C/O MASAYOSHI UMENO DEPT ELECT & COMP ENGN NAGOYA INST TECH, NAGOYA 466 JAPAN PY 1993 BP 615 EP 615 PG 1 WC Energy & Fuels; Engineering, Electrical & Electronic; Physics, Applied SC Energy & Fuels; Engineering; Physics GA BB94Z UT WOS:A1993BB94Z00221 ER PT B AU LANDIS, GA LOWE, R JENKINS, P JAIN, RK AF LANDIS, GA LOWE, R JENKINS, P JAIN, RK GP 7TH INT PVSEC ORGANIZING COMM TI SOLAR CELLS FOR LASER POWER RECEIVERS SO 7TH INTERNATIONAL PHOTOVOLTAIC SCIENCE AND ENGINEERING CONFERENCE, TECHNICAL DIGEST LA English DT Proceedings Paper CT 7th International Photovoltaic Science and Engineering Conference (PVSEC-7) CY NOV 22-26, 1993 CL NAGOYA, JAPAN SP Japan Soc Appl Phys, Inst Elect Engineers Japan, Nagoya Ind Sci Res Inst, Chem Soc Japan, Electrochem Soc Japan, Illuminating Engn Inst Japan, IEEE, Electron Devices Soc, Inst Electr Informat & Commun Engineers, Inst Televis Engineers Japan, Int Solar Energy Soc, Japanese Sect, Japan Soc Aeronaut & Space Sci, Japan Soc Direct Energy Convers, Japan Solar Energy Soc, Commiss EC, Photovoltaic Div C1 NASA,LEWIS RES CTR,CLEVELAND,OH 44135. NR 0 TC 1 Z9 1 U1 0 U2 0 PU INTERNATIONAL PVSEC-7 PI NAGOYA 466 PA C/O MASAYOSHI UMENO DEPT ELECT & COMP ENGN NAGOYA INST TECH, NAGOYA 466 JAPAN PY 1993 BP 616 EP 616 PG 1 WC Energy & Fuels; Engineering, Electrical & Electronic; Physics, Applied SC Energy & Fuels; Engineering; Physics GA BB94Z UT WOS:A1993BB94Z00222 ER PT B AU BAILEY, SG LANDIS, GA FATEMI, NS YOUNG, MJ AF BAILEY, SG LANDIS, GA FATEMI, NS YOUNG, MJ GP 7TH INT PVSEC ORGANIZING COMM TI MASKLESS TEXTURE ETCHING OF GAAS AND INP SO 7TH INTERNATIONAL PHOTOVOLTAIC SCIENCE AND ENGINEERING CONFERENCE, TECHNICAL DIGEST LA English DT Proceedings Paper CT 7th International Photovoltaic Science and Engineering Conference (PVSEC-7) CY NOV 22-26, 1993 CL NAGOYA, JAPAN SP Japan Soc Appl Phys, Inst Elect Engineers Japan, Nagoya Ind Sci Res Inst, Chem Soc Japan, Electrochem Soc Japan, Illuminating Engn Inst Japan, IEEE, Electron Devices Soc, Inst Electr Informat & Commun Engineers, Inst Televis Engineers Japan, Int Solar Energy Soc, Japanese Sect, Japan Soc Aeronaut & Space Sci, Japan Soc Direct Energy Convers, Japan Solar Energy Soc, Commiss EC, Photovoltaic Div C1 NASA,LEWIS RES CTR,CLEVELAND,OH 44135. NR 0 TC 0 Z9 0 U1 0 U2 0 PU INTERNATIONAL PVSEC-7 PI NAGOYA 466 PA C/O MASAYOSHI UMENO DEPT ELECT & COMP ENGN NAGOYA INST TECH, NAGOYA 466 JAPAN PY 1993 BP 617 EP 617 PG 1 WC Energy & Fuels; Engineering, Electrical & Electronic; Physics, Applied SC Energy & Fuels; Engineering; Physics GA BB94Z UT WOS:A1993BB94Z00223 ER PT B AU STEINMAN, JS AF STEINMAN, JS BE Bagrodia, R Jefferson, D TI BREATHING TIME WARP SO 7TH WORKSHOP ON PARALLEL AND DISTRIBUTED SIMULATION (PADS '93) LA English DT Proceedings Paper CT 7th Workshop on Parallel and Distributed Simulation (PADS 93) CY MAY 16-19, 1993 CL SAN DIEGO, CA SP ASSOC COMP MACHINERY, SIGSIM, SOC COMP SIMULAT INT, IEEE, COMP SOC C1 JET PROP LAB,PASADENA,CA 91109. NR 0 TC 5 Z9 5 U1 0 U2 2 PU SOC COMPUTER SIMULATION INT PI SAN DIEGO PA PO BOX 17900, SAN DIEGO, CA 92177 BN 1-56555-055-2 PY 1993 BP 109 EP 118 PG 10 WC Computer Science, Theory & Methods; Engineering, Electrical & Electronic SC Computer Science; Engineering GA BA34K UT WOS:A1993BA34K00014 ER PT B AU TROPPER, C BOUKERCHE, A AF TROPPER, C BOUKERCHE, A BE Bagrodia, R Jefferson, D TI PARALLEL SIMULATION OF COMMUNICATING FINITE-STATE MACHINES SO 7TH WORKSHOP ON PARALLEL AND DISTRIBUTED SIMULATION (PADS '93) LA English DT Proceedings Paper CT 7th Workshop on Parallel and Distributed Simulation (PADS 93) CY MAY 16-19, 1993 CL SAN DIEGO, CA SP ASSOC COMP MACHINERY, SIGSIM, SOC COMP SIMULAT INT, IEEE, COMP SOC C1 JET PROP LAB,PASADENA,CA 91109. NR 0 TC 0 Z9 0 U1 0 U2 0 PU SOC COMPUTER SIMULATION INT PI SAN DIEGO PA PO BOX 17900, SAN DIEGO, CA 92177 BN 1-56555-055-2 PY 1993 BP 143 EP 150 PG 8 WC Computer Science, Theory & Methods; Engineering, Electrical & Electronic SC Computer Science; Engineering GA BA34K UT WOS:A1993BA34K00018 ER PT J AU SZCZUR, MR SHEPPARD, SB AF SZCZUR, MR SHEPPARD, SB TI TAE PLUS - TRANSPORTABLE APPLICATIONS ENVIRONMENT PLUS - A USER INTERFACE DEVELOPMENT ENVIRONMENT SO ACM TRANSACTIONS ON INFORMATION SYSTEMS LA English DT Article DE DESIGN; GRAPHICAL USER INTERFACES; PROTOTYPING; USER INTERFACE DEVELOPMENT TOOLS AB The Transportable Applications Environment Plus (TAE Plus(TM)) is a NASA-developed user interface development environment (UIDE) for the rapid prototyping, evaluation, implementation, and management of user interfaces. TAE Plus provides an intuitive What You see Is What You Get (WYSIWYG) WorkBench for designing an application's user interface. The WorkBench supports the creation and sequencing of displays, including real-time, data-driven display objects. Users can define context-sensitive help for a target application. They can rehearse the user interface and also generate code automatically. In addition, TAE Plus contains application services for the runtime manipulation and management of the user interface. Based on Motif(TM) and the MIT X Window System(TM), TAE Plus runs. on a variety of Unix- or VMS-based workstations. TAE Plus is an evolving system. User-defined requirements and new technology guide the development of each new version. Advances in virtual operating systems, human factors, computer graphics, command language design, standardization, and software portability are monitored and incorporated as they become available. RP SZCZUR, MR (reprint author), NASA,GODDARD SPACE FLIGHT CTR,GREENBELT,MD 20771, USA. NR 27 TC 3 Z9 3 U1 0 U2 0 PU ASSOC COMPUTING MACHINERY PI NEW YORK PA 1515 BROADWAY, NEW YORK, NY 10036 SN 1046-8188 J9 ACM T INFORM SYST JI ACM Trans. Inf. Syst. PD JAN PY 1993 VL 11 IS 1 BP 76 EP 101 DI 10.1145/151480.151509 PG 26 WC Computer Science, Information Systems SC Computer Science GA KM912 UT WOS:A1993KM91200004 ER PT J AU HE, XM CRAVEN, BM AF HE, XM CRAVEN, BM TI INTERNAL VIBRATIONS OF A MOLECULE CONSISTING OF RIGID SEGMENTS .1. NONINTERACTING INTERNAL VIBRATIONS SO ACTA CRYSTALLOGRAPHICA SECTION A LA English DT Article ID NEUTRON-DIFFRACTION; CRYSTALS AB For molecular crystals, a procedure is proposed for interpreting experimentally determined atomic mean square anisotropic displacement parameters (ADPs) in terms of the overall molecular vibration together with internal vibrations with the assumption that the molecule consists of a set of linked rigid segments. The internal vibrations (molecular torsional or bending modes) are described using the variable internal coordinates of the segmented body. In paper I of this two-part report, it is assumed as a zero-order approximation that the internal vibrations about the linkage axes between pairs of segments are uncorrelated with each other and with the overall molecular rigid-body vibrations. As a first-order approximation, the possibility that each internal vibration can be correlated with the external vibrations is also considered. An important feature of this approach is that the internal librations are required to give zero contribution to the overall momentum of the molecule at all times, so the internal coordinates must be orthogonal to the external ones. Also, each of the internal librations involves the motion of all atoms in the molecule. The resulting internal vibrational parameters are invariant to the choice of reference segment. With this procedure, the experimental ADPs obtained from crystal structure determinations involving six small molecules (sym-trinitrobenzene, adenosine, tetra-cyanoquinodimethane, benzamide, alpha-cyanoacetic acid hydrazide and N-acetyl-L-tryptophan methylamide) have been analyzed. As a consequence, vibrational corrections to the bond lengths and angles of the molecule are calculated as well as the frequencies and force constants (with e.s.d.'s) for each internal torsional or bending vibration. Compared with other models used for describing internal vibrations, there are differences in how the total ADP is partitioned between the internal and overall molecular vibrations. C1 UNIV PITTSBURGH,DEPT CRYSTALLOG,PITTSBURGH,PA 15260. RP HE, XM (reprint author), NASA,GEORGE C MARSHALL SPACE FLIGHT CTR,SPACE SCI LAB,BIOPHYS BRANCH ES76,HUNTSVILLE,AL 35812, USA. FU NCI NIH HHS [CA-19616]; NHLBI NIH HHS [HL-20350]; NIGMS NIH HHS [GM-39513] NR 24 TC 30 Z9 30 U1 0 U2 4 PU MUNKSGAARD INT PUBL LTD PI COPENHAGEN PA 35 NORRE SOGADE, PO BOX 2148, DK-1016 COPENHAGEN, DENMARK SN 0108-7673 J9 ACTA CRYSTALLOGR A JI Acta Crystallogr. Sect. A PD JAN 1 PY 1993 VL 49 BP 10 EP 22 DI 10.1107/S0108767392005245 PN 1 PG 13 WC Chemistry, Multidisciplinary; Crystallography SC Chemistry; Crystallography GA KK211 UT WOS:A1993KK21100002 PM 8442928 ER PT J AU IGARASHI, M RESCHKE, MF HENLEY, C MACDONALD, S KOHL, R MIZUKOSHI, K AF IGARASHI, M RESCHKE, MF HENLEY, C MACDONALD, S KOHL, R MIZUKOSHI, K TI SALIVARY TOTAL PROTEIN AND EXPERIMENTAL CORIOLIS SICKNESS SO ACTA OTO-LARYNGOLOGICA LA English DT Article DE SALIVA; TOTAL PROTEIN; CORIOLIS SICKNESS; MOTION SICKNESS AB Symptomatic reporting has been used in quantifying the severity of motion sickness including Coriolis sickness. This study was designed to objectively examine if the dynamic changes of salivary protein concentration relate to the severity of Coriolis sickness. Healthy adults with normal vestibular function underwent a modified Coriolis Sickness Susceptibility Index (CSSI) test, utilizing a staircase profile. Salivary samples were obtained prior to stimulation, 15, 30, and 45 min following stimulus onset, and/or upon reaching ''nausea-II'' endpoint. Total protein concentration tended to rise over the initial 30 min of stimulation, and then level off or decline. A statistically significant difference was found between the pre-stimulation and 30 min samples. Although some variability existed among the subjects, the general pattern of changes along the time course was similar. An inverse correlation approaching statistical significance was found between control (non-stimulus) total protein levels, and minutes of Coriolis stimulation required to reach the ''nausea-II'' endpoint. Thus, baseline salivary total protein levels can be of use in predicting susceptibility of Coriolis sickness and other forms of motion sickness. C1 TOYAMA MED & PHARMACEUT UNIV,DEPT OTOLARYNGOL,2630 SUGITANI,TOYAMA,TOYAMA 93001,JAPAN. NIHON UNIV,UNIV RES CTR,TOKYO 102,JAPAN. NASA,LYNDON B JOHNSON SPACE CTR,SPACE BIOMED RES INST,NEUROSCI LAB,HOUSTON,TX 77058. BAYLOR COLL MED,DEPT OTORHINOLARYNGOL & COMMUNICAT SCI,HOUSTON,TX 77030. UNIV SPACE RES ASSOC,HOUSTON,TX 77058. NR 16 TC 2 Z9 2 U1 0 U2 0 PU SCANDINAVIAN UNIVERSITY PRESS PI OSLO PA PO BOX 2959 TOYEN, JOURNAL DIVISION CUSTOMER SERVICE, N-0608 OSLO, NORWAY SN 0001-6489 J9 ACTA OTO-LARYNGOL JI Acta Oto-Laryngol. PY 1993 SU 504 BP 38 EP 40 PG 3 WC Otorhinolaryngology SC Otorhinolaryngology GA KV066 UT WOS:A1993KV06600008 ER PT J AU PROGAR, DJ STCLAIR, TL AF PROGAR, DJ STCLAIR, TL BE Boerio, FJ TI ADHESIVE EVALUATION FOR NEW FORMS OF LARC(TM)-TPI SO ADHESION SOCIETY PROCEEDINGS OF THE SIXTEENTH ANNUAL MEETING AND THE INTERNATIONAL SYMPOSIUM ON THE INTERPHASE LA English DT Proceedings Paper CT 16th Annual Meeting of the Adhesion-Society/International Symposium on the Interphase CY FEB 21-26, 1993 CL WILLIAMSBURG, VA SP ADHES SOC, USN, OFF NAVAL RES, NATL SCI FDN, USA, ARMY RES OFF, GORDON & BREACH SCI PUBL INC, LOCTITE CORP, DOW CHEM CO, ESSEX SPECIALTY CHEM CO, NATL STARCH & CHEM CO, ALLIED SIGNAL, S C JOHNSON WAX, FORD MOTOR CO, AIR PROD & CHEM CO, AMER VACUUM SOC, APPL SURFACE SCI DIV C1 NASA,LANGLEY RES CTR,HAMPTON,VA 23665. NR 0 TC 0 Z9 0 U1 0 U2 0 PU ADHESION SOCIETY PI BALTIMORE PA MARTIN MARIETTA LABORATORIES 1450 S ROLLING RD, BALTIMORE, MD 21227 PY 1993 BP 404 EP 406 PG 3 WC Engineering, Mechanical; Materials Science, Characterization & Testing; Materials Science, Coatings & Films; Materials Science, Composites; Polymer Science SC Engineering; Materials Science; Polymer Science GA BC38S UT WOS:A1993BC38S00128 ER PT B AU OBRIEN, TK AF OBRIEN, TK BE Chandra, T Dhingra, AK TI STACKING-SEQUENCE EFFECT ON LOCAL DELAMINATION ONSET IN FATIGUE SO ADVANCED COMPOSITES '93: INTERNATIONAL CONFERENCE ON ADVANCED COMPOSITE MATERIALS LA English DT Proceedings Paper CT International Conference on Advanced Composite Materials (ICACM) - Advanced Composites 93 CY FEB 15-19, 1993 CL UNIV WOLLONGONG, WOLLONGONG, AUSTRALIA SP MINERALS MET & MAT SOC, PHYS MET COMM HO UNIV WOLLONGONG C1 NASA,LANGLEY RES CTR,USA,VEHICLE STRUCT DIRECTORATE,HAMPTON,VA 23681. NR 0 TC 1 Z9 1 U1 0 U2 0 PU MINERALS, METALS & MATERIALS SOC PI WARRENDALE PA 420 COMMONWEALTH DR, WARRENDALE, PA 15086 BN 0-87339-251-5 PY 1993 BP 399 EP 406 PG 8 WC Materials Science, Composites SC Materials Science GA BA47E UT WOS:A1993BA47E00056 ER PT B AU BAKER, DJ AF BAKER, DJ GP ESD, THE ENGINEERING SOC TI FLIGHT SERVICE EXPERIENCES WITH COMPOSITES SO ADVANCED COMPOSITES TECHNOLOGIES LA English DT Proceedings Paper CT 9th Annual ASM/ESD Advanced Composites Conference CY NOV 08-11, 1993 CL DEARBORN, MI SP ESD, THE ENGN SOC, ASM INT, SOC ADV MAT & PROC ENGN, AMER SOC COMPOSITES, MICHIGAN MAT & PROC INST, EDISON MAT TECHNOL CTR C1 NASA,LANGLEY RES CTR,USA,RES LAB,VEHICLE STRUCT DIRECTORATE,HAMPTON,VA 23665. NR 0 TC 0 Z9 0 U1 0 U2 0 PU ESD-THE ENGINEERING SOCIETY PI DETROIT PA 100 FARNSWORTH AVE, DETROIT, MI 48202 BN 1-56378-014-3 PY 1993 BP 481 EP 505 PG 25 WC Engineering, Manufacturing; Engineering, Mechanical; Materials Science, Composites SC Engineering; Materials Science GA BC87Q UT WOS:A1993BC87Q00035 ER PT J AU PATER, RH SOUCEK, MD JANG, BZ AF PATER, RH SOUCEK, MD JANG, BZ TI DEFORMATION AND FRACTURE-TOUGHNESS IN HIGH-PERFORMANCE POLYMERS - COMPARATIVE-STUDY OF CRYSTALLINITY AND CROSS-LINKING EFFECTS SO ADVANCES IN CHEMISTRY SERIES LA English DT Review ID RUBBER PARTICULATE COMPOSITES; MECHANISMS; TEMPERATURE; BEHAVIOR; POLYIMIDE AB A systematic study was made of 10 principal high-performance thermoplastics and two semiinterpenetrating polymer networks (semi-IPNs). The fundamental tendency to undergo localized crazing or shear banding, as opposed to a more diffuse homogeneous shear-yielding deformation, was evaluated. Amorphous thermoplastics exhibited crazing as the primary mode of deformation. In contrast, semi-crystalline materials displayed both crazing, and shear banding. Increasing the crystallinity increased diffuse shear yielding at the expense of craze growth. Another effect was an enlargement of the deformation zone. Some ordered polymers showed only diffuse shear yielding, whereas others displayed a combination Of weak crazes and diffuse shear yielding. For a semi-IPN, increasing the degree of cross-linking decreased crazing, deformation zone size, and fracture toughness of an amorphous thermoplastic. Thus, crystallinity acts like cross-linking in reducing crazing, but, exerts the opposite effect on changing the size of the deformation zone. These results suggest that the reduction in fracture toughness by crystallinity is mainly due to decreased crazing, whereas reduction by cross-linking arises from both decreased crazing and diminished deformation zone. C1 NASA,LANGLEY RES CTR,HAMPTON,VA 23665. AUBURN UNIV,AUBURN,AL 36849. NR 38 TC 0 Z9 0 U1 1 U2 5 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0065-2393 J9 ADV CHEM SER JI Adv. Chem. Ser. PY 1993 IS 233 BP 105 EP 141 PG 37 WC Chemistry, Multidisciplinary SC Chemistry GA LJ634 UT WOS:A1993LJ63400006 ER PT S AU TRALLI, DM TAJIMA, F AF TRALLI, DM TAJIMA, F BE Dmowska, R Saltzman, B TI SEISMOLOGY AND SPACE-BASED GEODESY SO ADVANCES IN GEOPHYSICS, VOL 34 SE Advances in Geophysics LA English DT Review ID GLOBAL POSITIONING SYSTEM; WESTERN UNITED-STATES; STRIKE SLIP FAULT; LONG BASELINE INTERFEROMETRY; 1987 SUPERSTITION HILLS; COMPLEX BODY WAVES; SAN-ANDREAS FAULT; PHASE AMBIGUITY RESOLUTION; CRUSTAL DEFORMATION; STRAIN ACCUMULATION C1 UNIV TEXAS, INST GEOPHYS, AUSTIN, TX 78759 USA. RP CALTECH, JET PROP LAB, DIV EARTH & SPACE SCI, PASADENA, CA 91109 USA. NR 172 TC 1 Z9 1 U1 1 U2 2 PU ELSEVIER ACADEMIC PRESS INC PI SAN DIEGO PA 525 B STREET, SUITE 1900, SAN DIEGO, CA 92101-4495 USA SN 0065-2687 BN 0-12-018834-1 J9 ADV GEOPHYS JI Adv. Geophys. PY 1993 VL 34 BP 35 EP 91 DI 10.1016/S0065-2687(08)60434-3 PG 57 WC Geosciences, Multidisciplinary SC Geology GA BA01H UT WOS:A1993BA01H00002 ER PT J AU PANDOLFO, L AF PANDOLFO, L TI OBSERVATIONAL ASPECTS OF THE LOW-FREQUENCY INTRASEASONAL VARIABILITY OF THE ATMOSPHERE IN MIDDLE LATITUDES SO ADVANCES IN GEOPHYSICS, VOL 34 SE ADVANCES IN GEOPHYSICS LA English DT Review ID GENERAL-CIRCULATION MODEL; HEMISPHERE WINTERTIME CIRCULATION; FORCED PLANETARY-WAVES; PROBABILITY DENSITY DISTRIBUTION; LOW-ORDER MODEL; EMPIRICAL ORTHOGONAL FUNCTIONS; PRINCIPAL COMPONENT ANALYSIS; BAROCLINIC 2-LAYER MODELS; HARMONIC STANDING WAVES; NON-LINEAR INTERACTIONS C1 NASA,GODDARD INST SPACE STUDIES,NEW YORK,NY 10025. RP PANDOLFO, L (reprint author), COLUMBIA UNIV,CTR STUDY GLOBAL HABITABIL,NEW YORK,NY 10025, USA. NR 181 TC 15 Z9 15 U1 1 U2 1 PU ACADEMIC PRESS INC PI SAN DIEGO PA 525 B STREET, SUITE 1900, SAN DIEGO, CA 92101-4495 SN 0065-2687 J9 ADV GEOPHYS PY 1993 VL 34 BP 93 EP 174 DI 10.1016/S0065-2687(08)60435-5 PG 82 WC Geosciences, Multidisciplinary SC Geology GA BA01H UT WOS:A1993BA01H00003 ER PT J AU KEATING, GM AF KEATING, GM TI MIDDLE AND UPPER-ATMOSPHERE RESULTS - PROCEEDINGS OF THE TOPICAL MEETING OF THE COSPAR INTERDISCIPLINARY SCIENTIFIC COMMISSION-C (MEETINGS C2 AND C3) AND A (MEETING A5) OF THE COSPAR 28TH PLENARY MEETING HELD IN THE HAGUE, THE NETHERLANDS, 25 JUNE - 6 JULY 1990 - PREFACE SO ADVANCES IN SPACE RESEARCH LA English DT Editorial Material C1 NASA,LANGLEY RES CTR,HAMPTON,VA 23665. NR 0 TC 0 Z9 0 U1 0 U2 1 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0273-1177 J9 ADV SPACE RES JI Adv. Space Res. PD JAN PY 1993 VL 13 IS 1 BP 3 EP 3 DI 10.1016/0273-1177(93)90002-S PG 1 WC Astronomy & Astrophysics; Geosciences, Multidisciplinary; Meteorology & Atmospheric Sciences SC Astronomy & Astrophysics; Geology; Meteorology & Atmospheric Sciences GA JW710 UT WOS:A1993JW71000001 ER PT J AU MCCORMICK, MP WANG, PH PITTS, MC AF MCCORMICK, MP WANG, PH PITTS, MC TI BACKGROUND STRATOSPHERIC AEROSOL AND POLAR STRATOSPHERIC CLOUD REFERENCE MODELS SO ADVANCES IN SPACE RESEARCH LA English DT Article ID SAM-II; CORRELATIVE MEASUREMENTS; ANTARCTIC OZONE; SATELLITE; LIDAR; SAGE AB A global aerosol climatology is evolving from the NASA satellite experiments SAM II, SAGE I, and SAGE II. In addition, polar stratospheric cloud (PSC) data have been obtained from these experiments over the last decade. This paper will describe an updated reference model of the optical characteristics of the background aerosol and propose a new aerosol reference model derived from the latest available data. The aerosol models are referenced to the height above the tropopause. The impact of a number of volcanic eruptions will be described. In addition, a model describing the seasonal, longitudinal, and interannual variations in PSCs will be presented. C1 NASA,LANGLEY RES CTR,DIV ATMOSPHER SCI,HAMPTON,VA 23665. SCI & TECHNOL CORP,HAMPTON,VA 23666. ST SYST CORP,HAMPTON,VA 23666. NR 19 TC 11 Z9 12 U1 0 U2 0 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0273-1177 J9 ADV SPACE RES JI Adv. Space Res. PD JAN PY 1993 VL 13 IS 1 BP 7 EP 29 DI 10.1016/0273-1177(93)90003-T PG 23 WC Astronomy & Astrophysics; Geosciences, Multidisciplinary; Meteorology & Atmospheric Sciences SC Astronomy & Astrophysics; Geology; Meteorology & Atmospheric Sciences GA JW710 UT WOS:A1993JW71000002 ER PT J AU KEATING, GM CHEN, C AF KEATING, GM CHEN, C TI EXTENSIONS TO THE CIRA REFERENCE MODELS FOR MIDDLE ATMOSPHERE OZONE SO ADVANCES IN SPACE RESEARCH LA English DT Article ID SAGE; SATELLITE AB The recent ozone reference models generated for the new COSPAR International Reference Atmosphere (CIRA) include ozone vertical structure from 25 to 90 km as a function of month and latitude based on five satellite experiments. The new model provided here extends the ozone vertical structure climatology from 20 mb (almost-equal-to 25 km) to 70mb (almost-equal-to 18 km) based on 3 years of recently reprocessed AEM-2 SAGE I(sunset) data. In addition, model refinements are made at altitudes above 25 km based on the reprocessed data. Comparisons are made between the ozone reference models and non-satellite data sets. The model extensions to lower altitudes are in excellent agreement with in situ measurements both at mid latitudes and in the tropics. Annual mean models of ozone are also provided as a function of latitude from 100mb (almost-equal-to 16 km) to 0.003 mb (almost-equal-to 90 km). C1 NASA,LANGLEY RES CTR,DIV ATMOSPHER SCI,HAMPTON,VA 23665. UNIV SPACE RES ASSOC,GREENBELT,MD 20771. NR 17 TC 6 Z9 6 U1 0 U2 0 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0273-1177 J9 ADV SPACE RES JI Adv. Space Res. PD JAN PY 1993 VL 13 IS 1 BP 45 EP 54 DI 10.1016/0273-1177(93)90005-V PG 10 WC Astronomy & Astrophysics; Geosciences, Multidisciplinary; Meteorology & Atmospheric Sciences SC Astronomy & Astrophysics; Geology; Meteorology & Atmospheric Sciences GA JW710 UT WOS:A1993JW71000004 ER PT J AU HERRERO, FA CHAKRABARTI, S AF HERRERO, FA CHAKRABARTI, S TI EQUATORIAL THERMOSPHERE AND AERONOMY - MODELS AND SAN-MARCO SATELLITE GROUND BASED OBSERVATIONS (MTG C3) - PREFACE SO ADVANCES IN SPACE RESEARCH LA English DT Editorial Material C1 NASA,GODDARD SPACE FLIGHT CTR,GREENBELT,MD 20771. UNIV CALIF BERKELEY,SPACE SCI LAB,BERKELEY,CA 94720. NR 0 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 0273-1177 J9 ADV SPACE RES JI Adv. Space Res. PD JAN PY 1993 VL 13 IS 1 BP 163 EP 163 DI 10.1016/0273-1177(93)90016-5 PG 1 WC Astronomy & Astrophysics; Geosciences, Multidisciplinary; Meteorology & Atmospheric Sciences SC Astronomy & Astrophysics; Geology; Meteorology & Atmospheric Sciences GA JW710 UT WOS:A1993JW71000015 ER PT J AU HERRERO, FA SPENCER, NW MAYR, HG AF HERRERO, FA SPENCER, NW MAYR, HG TI THERMOSPHERE AND F-REGION PLASMA DYNAMICS IN THE EQUATORIAL REGION SO ADVANCES IN SPACE RESEARCH LA English DT Article ID MIDNIGHT TEMPERATURE MAXIMUM; GENERAL-CIRCULATION MODEL; MERIDIONAL NEUTRAL WINDS; OPTICAL OBSERVATIONS; COUPLED COMPOSITION; INCOHERENT-SCATTER; AURORAL FORCINGS; ARECIBO; TIDES; EQUINOX AB The dynamics of the equatorial thermosphere and the F-region ionospheric plasma are reviewed highlighting several features observed with in-situ satellite and ground-based experiments. Attention is given to the midnight temperature maximum (MTM) and related phenomena and to recent results on zonal neutral and plasma flows at F-region heights. The midnight temperature maximum and its midnight pressure bulge above 250 km altitude lead to neutral wind variations which significantly affect the F-region equilibrium height and its airglow emissions. During magnetically active periods, enhanced meridional winds from the poles lead to strong meridional intensity gradients (MIGs) in the atomic oxygen emission at 6300angstrom; MIGs have been used to estimate the magnitude of meridional wind gradients during active periods, and these estimates are consistent with measurements using incoherent scatter radar and optical Fabry-Perot interferometry. The pressure gradients which drive the thermospheric wind have been estimated using averaged density and temperature data, and the results have been used to check the consistency of the current data base in terms of the momentum equation. New analyses of the AE-E data are presented as further evidence of the effect of the MTM on the latitude-local time distribution of the meridional wind reversal. The tidal decomposition studies of the neutral temperature and of both ion and neutral flows are reviewed. The zonal plasma flow is found to be closely coupled to the zonal neutral wind as a consequence of the F-region dynamo, and more recently, the F-region dynamo has been found to play an important role in an anomaly in the latitudinal distribution of the equatorial zonal plasma flow. C1 NASA,GODDARD SPACE FLIGHT CTR,GREENBELT,MD 20771. NR 44 TC 23 Z9 23 U1 1 U2 1 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0273-1177 J9 ADV SPACE RES JI Adv. Space Res. PD JAN PY 1993 VL 13 IS 1 BP 201 EP 220 DI 10.1016/0273-1177(93)90019-8 PG 20 WC Astronomy & Astrophysics; Geosciences, Multidisciplinary; Meteorology & Atmospheric Sciences SC Astronomy & Astrophysics; Geology; Meteorology & Atmospheric Sciences GA JW710 UT WOS:A1993JW71000018 ER PT J AU AGGSON, TL HANSON, WB HERRERO, FA MAYNARD, NC PFAFF, RF SABA, JL TSUNODA, RT AF AGGSON, TL HANSON, WB HERRERO, FA MAYNARD, NC PFAFF, RF SABA, JL TSUNODA, RT TI EQUATORIAL ELECTRIC-FIELD OBSERVATIONS SO ADVANCES IN SPACE RESEARCH LA English DT Article ID RAYLEIGH-TAYLOR INSTABILITY; SPREAD-F; PLASMA BUBBLES; LAYER; SHEAR AB Both DC and AC measurements of equatorial electric fields from the San Marco D satellite are reported. These measurements were made with double floating probe sensors and have yielded a surprising number of new phenomena and effects in regions of equatorial spread F. The electric fields observed inside equatorial bubbles at altitudes greater than 400km are characterized by large DC eastward electric fields (approximately 10 mV/m up to 50 mV/m) which can be associated with large plasma upward convection velocities (500 m/s to 2500 m/s). The vertical electric fields show bubble tilting inclinations that are often westward and more rarely eastward. All of the upward convecting bubble events examined show a striking and systematic lack of conservation of the vertical component of the electric field vector on either side of the structures. This lack of conservation corresponds to the component tangential to the bubble walls and is of the order of 1 mV/m leading to the conclusion that the bubbles are collapsing inward at the rate of some tens of meters per second. The largest updrafting events are shown to involve displacement currents implying that some bubbles evolve into Alfvenic disturbances at high altitudes. The AC measurements can be divided into wavelengths less than or greater than a gyro-radius. At the longer wavelengths the AC electric fields (RMS) are shown to often track the DC electric field variations implying that the eastward currents are continuous through the bubble irregularities. At shorter wavelengths the measured RMS electric fields are shown to be often closely correlated with plasma gradients at the walls of the bubbles. C1 NASA,GODDARD SPACE FLIGHT CTR,GREENBELT,MD 20771. UNIV TEXAS,RICHARDSON,TX 75083. PHILLIPS LAB,GEOPHYS DIRECTORATE,BEDFORD,MA 01731. ST SYST CORP,LANHAM,MD 20706. SRI INT,MENLO PK,CA 94025. RI Pfaff, Robert/F-5703-2012 OI Pfaff, Robert/0000-0002-4881-9715 NR 20 TC 11 Z9 11 U1 0 U2 0 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0273-1177 J9 ADV SPACE RES JI Adv. Space Res. PD JAN PY 1993 VL 13 IS 1 BP 271 EP 291 DI 10.1016/0273-1177(93)90024-6 PG 21 WC Astronomy & Astrophysics; Geosciences, Multidisciplinary; Meteorology & Atmospheric Sciences SC Astronomy & Astrophysics; Geology; Meteorology & Atmospheric Sciences GA JW710 UT WOS:A1993JW71000023 ER PT J AU ECKMAN, RS TURNER, RE BLACKSHEAR, WT FAIRLIE, TDA GROSE, WL AF ECKMAN, RS TURNER, RE BLACKSHEAR, WT FAIRLIE, TDA GROSE, WL TI SOME ASPECTS OF THE INTERACTION BETWEEN CHEMICAL AND DYNAMIC PROCESSES RELATING TO THE ANTARCTIC OZONE HOLE SO ADVANCES IN SPACE RESEARCH LA English DT Article ID INTERANNUAL VARIABILITY; LOWER STRATOSPHERE; CIRCULATION; NITROGEN; TOMS AB Observational and modeling studies have been conducted to examine the interaction between the chemical and dynamical processes that occur during springtime in the lower stratosphere of the Southern Hemisphere. The temporal evolution of the ozone distribution and the circulation during 1987 is contrasted with that for 1988 as an illustrative example of how dynamical processes and the resulting meteorological conditions modulate the ozone depletion. Concurrently with the observational analysis, an effort was initiated to simulate the ozone depletion during austral spring using a three-dimensional chemical/transport model. The model includes a parameterized representation of the heterogeneous processes thought to be important in this region. The simulation indicates that the inclusion of this additional chemistry, which results in the release of free chlorine and the redistribution of odd nitrogen into reservoir species, reproduces many aspects of the observations. While significant uncertainties and difficulties remain in order to include heterogeneous chemistry in stratospheric models in a self-consistent manner, the preliminary results are encouraging and provide the impetus for improving current models. C1 NASA,LANGLEY RES CTR,DIV ATMOSPHER SCI,HAMPTON,VA 23665. SCI & TECHNOL CORP,HAMPTON,VA 23666. NR 27 TC 4 Z9 4 U1 0 U2 0 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0273-1177 J9 ADV SPACE RES JI Adv. Space Res. PD JAN PY 1993 VL 13 IS 1 BP 311 EP 319 DI 10.1016/0273-1177(93)90029-B PG 9 WC Astronomy & Astrophysics; Geosciences, Multidisciplinary; Meteorology & Atmospheric Sciences SC Astronomy & Astrophysics; Geology; Meteorology & Atmospheric Sciences GA JW710 UT WOS:A1993JW71000028 ER PT J AU LEWIS, MS AF LEWIS, MS TI SENSING A CHANGE IN THE WIND SO AEROSPACE AMERICA LA English DT Article RP LEWIS, MS (reprint author), NASA,LANGLEY RES CTR,HAMPTON,VA 23665, USA. NR 0 TC 1 Z9 1 U1 0 U2 0 PU AMER INST AERONAUT ASTRONAUT PI RESTON PA 1801 ALEXANDER BELL DRIVE, STE 500, RESTON, VA 22091 SN 0740-722X J9 AEROSPACE AM JI Aerosp. Am. PD JAN PY 1993 VL 31 IS 1 BP 20 EP & PG 0 WC Engineering, Aerospace SC Engineering GA KD915 UT WOS:A1993KD91500006 ER PT J AU MATHER, JC AF MATHER, JC TI COBE LOOKS BACK TO THE BIG-BANG SO AEROSPACE AMERICA LA English DT Article RP MATHER, JC (reprint author), NASA,GODDARD SPACE FLIGHT CTR,GREENBELT,MD 20771, 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 JAN PY 1993 VL 31 IS 1 BP 27 EP 30 PG 4 WC Engineering, Aerospace SC Engineering GA KD915 UT WOS:A1993KD91500007 ER PT B AU RITTER, RD AF RITTER, RD GP IEEE TI PILOT ERROR IN AUTOMATED SYSTEMS SHOWN BY ALTITUDE DEVIATION REPORTS SO AIAA/IEEE DIGITAL AVIONICS SYSTEMS CONFERENCE, 12TH DASC LA English DT Proceedings Paper CT AIAA/IEEE Digital Avionics Systems Conference (12th DASC) CY OCT 25-28, 1993 CL FT WORTH, TX SP AMER INST AERONAUT & ASTRONAUT, IEEE C1 NASA,AMES RES CTR,FAA,TECH FIELD OFF,MOFFETT FIELD,CA 94035. NR 0 TC 0 Z9 0 U1 0 U2 0 PU I E E E PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 BN 0-7803-1343-7 PY 1993 BP 60 EP 65 PG 6 WC Engineering, Aerospace; Engineering, Electrical & Electronic SC Engineering GA BZ86U UT WOS:A1993BZ86U00012 ER PT B AU ABBOTT, TS ROGERS, WH AF ABBOTT, TS ROGERS, WH GP IEEE TI FUNCTIONAL CATEGORIES FOR HUMAN-CENTERED FLIGHT DECK DESIGN SO AIAA/IEEE DIGITAL AVIONICS SYSTEMS CONFERENCE, 12TH DASC LA English DT Proceedings Paper CT AIAA/IEEE Digital Avionics Systems Conference (12th DASC) CY OCT 25-28, 1993 CL FT WORTH, TX SP AMER INST AERONAUT & ASTRONAUT, IEEE C1 NASA,LANGLEY RES CTR,DIV FLIGHT MANAGEMENT,HAMPTON,VA 23681. NR 0 TC 0 Z9 0 U1 0 U2 1 PU I E E E PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 BN 0-7803-1343-7 PY 1993 BP 66 EP 74 PG 9 WC Engineering, Aerospace; Engineering, Electrical & Electronic SC Engineering GA BZ86U UT WOS:A1993BZ86U00013 ER PT B AU WHITE, AL AF WHITE, AL GP IEEE TI COMPUTER UPSET, MATRIX NORMS, AND ASYMPTOTIC STABILITY SO AIAA/IEEE DIGITAL AVIONICS SYSTEMS CONFERENCE, 12TH DASC LA English DT Proceedings Paper CT AIAA/IEEE Digital Avionics Systems Conference (12th DASC) CY OCT 25-28, 1993 CL FT WORTH, TX SP AMER INST AERONAUT & ASTRONAUT, IEEE C1 NASA,LANGLEY RES CTR,HAMPTON,VA 23681. NR 0 TC 0 Z9 0 U1 0 U2 0 PU I E E E PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 BN 0-7803-1343-7 PY 1993 BP 237 EP 242 PG 6 WC Engineering, Aerospace; Engineering, Electrical & Electronic SC Engineering GA BZ86U UT WOS:A1993BZ86U00040 ER PT B AU WHITE, AL AF WHITE, AL GP IEEE TI A SIMULATED-LIFE VALIDATION EXPERIMENT FOR FAULT-TOLERANT SYSTEMS SO AIAA/IEEE DIGITAL AVIONICS SYSTEMS CONFERENCE, 12TH DASC LA English DT Proceedings Paper CT AIAA/IEEE Digital Avionics Systems Conference (12th DASC) CY OCT 25-28, 1993 CL FT WORTH, TX SP AMER INST AERONAUT & ASTRONAUT, IEEE C1 NASA,LANGLEY RES CTR,HAMPTON,VA 23681. NR 0 TC 0 Z9 0 U1 0 U2 0 PU I E E E PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 BN 0-7803-1343-7 PY 1993 BP 254 EP 259 PG 6 WC Engineering, Aerospace; Engineering, Electrical & Electronic SC Engineering GA BZ86U UT WOS:A1993BZ86U00043 ER PT B AU ZELENKA, RE SWENSON, HN DEARING, MG HARDY, GH AF ZELENKA, RE SWENSON, HN DEARING, MG HARDY, GH GP IEEE TI SIMULATION DEVELOPMENT OF A FORWARD SENSOR-ENHANCED LOW-ALTITUDE GUIDANCE-SYSTEM SO AIAA/IEEE DIGITAL AVIONICS SYSTEMS CONFERENCE, 12TH DASC LA English DT Proceedings Paper CT AIAA/IEEE Digital Avionics Systems Conference (12th DASC) CY OCT 25-28, 1993 CL FT WORTH, TX SP AMER INST AERONAUT & ASTRONAUT, IEEE C1 NASA,AMES RES CTR,MOFFETT FIELD,CA 94035. NR 0 TC 0 Z9 0 U1 0 U2 0 PU I E E E PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 BN 0-7803-1343-7 PY 1993 BP 267 EP 275 PG 9 WC Engineering, Aerospace; Engineering, Electrical & Electronic SC Engineering GA BZ86U UT WOS:A1993BZ86U00045 ER PT B AU SRIDHAR, B SUORSA, RE AF SRIDHAR, B SUORSA, RE GP IEEE TI COMPUTER ARCHITECTURES FOR A REAL-TIME PASSIVE RANGING ALGORITHM SO AIAA/IEEE DIGITAL AVIONICS SYSTEMS CONFERENCE, 12TH DASC LA English DT Proceedings Paper CT AIAA/IEEE Digital Avionics Systems Conference (12th DASC) CY OCT 25-28, 1993 CL FT WORTH, TX SP AMER INST AERONAUT & ASTRONAUT, IEEE C1 NASA,AMES RES CTR,MOFFETT FIELD,CA 94035. NR 0 TC 0 Z9 0 U1 0 U2 0 PU I E E E PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 BN 0-7803-1343-7 PY 1993 BP 292 EP 297 PG 6 WC Engineering, Aerospace; Engineering, Electrical & Electronic SC Engineering GA BZ86U UT WOS:A1993BZ86U00048 ER PT J AU BARNWELL, RW AF BARNWELL, RW TI EFFECT OF SIDEWALL SUCTION ON FLOW IN 2-DIMENSIONAL WIND TUNNELS SO AIAA JOURNAL LA English DT Article AB A closed-form analysis of flow in a two-dimensional subsonic wind tunnel (hat uses sidewall suction around the model to reduce sidewall boundary-layer effects is presented. The model problem that is treated involves a flat plate airfoil in a tunnel with a suction window shaped to permit an analytic solution. This solution shows that the lift coefficient depends explicitly on the porosity parameter of the suction window and implicitly on the suction pressure differential. For.a given sidewall displacement thickness, the lift coefficient increases as the suction-window porosity decreases. RP BARNWELL, RW (reprint author), NASA,LANGLEY RES CTR,DIV SPACE SYST,HAMPTON,VA 23681, USA. NR 8 TC 1 Z9 1 U1 0 U2 0 PU AMER INST AERONAUT ASTRONAUT PI RESTON PA 1801 ALEXANDER BELL DRIVE, STE 500, RESTON, VA 22091 SN 0001-1452 J9 AIAA J JI AIAA J. PD JAN PY 1993 VL 31 IS 1 BP 36 EP 41 DI 10.2514/3.11315 PG 6 WC Engineering, Aerospace SC Engineering GA KH576 UT WOS:A1993KH57600008 ER PT J AU FELKER, FF AF FELKER, FF TI DIRECT SOLUTION OF 2-DIMENSIONAL NAVIER-STOKES EQUATIONS FOR STATIC AEROELASTICITY PROBLEMS SO AIAA JOURNAL LA English DT Article ID EULER EQUATIONS; STEADY AB A new method has been developed to calculate the steady flow and structural deformations for fluid/structure interaction problems. The discretized fluid dynamic and structural equations are regarded as a single set of coupled, nonlinear, algebraic equations. The equilibrium solution is directly obtained using Newton's method. The governing equations used for the fluid flow are the two-dimensional Navier-Stokes equations, and a finite element model is used to represent the structure. This paper describes the analytical method and presents sample calculations demonstrating the technique. The results show rapid convergence and good agreement with experimental data. RP FELKER, FF (reprint author), NASA,AMES RES CTR,ROTORCRAFT AEROMECH BRANCH,MAIL STOP T-042,MOFFETT FIELD,CA 94035, USA. NR 19 TC 11 Z9 11 U1 0 U2 1 PU AMER INST AERONAUT ASTRONAUT PI RESTON PA 1801 ALEXANDER BELL DRIVE, STE 500, RESTON, VA 22091 SN 0001-1452 J9 AIAA J JI AIAA J. PD JAN PY 1993 VL 31 IS 1 BP 148 EP 153 DI 10.2514/3.11331 PG 6 WC Engineering, Aerospace SC Engineering GA KH576 UT WOS:A1993KH57600024 ER PT J AU ZHANG, HS SO, RMC SPEZIALE, CG LAI, YG AF ZHANG, HS SO, RMC SPEZIALE, CG LAI, YG TI NEAR-WALL 2-EQUATION MODEL FOR COMPRESSIBLE TURBULENT FLOWS SO AIAA JOURNAL LA English DT Note C1 NASA,LANGLEY RES CTR,ICASE,HAMPTON,VA 23665. CFD RES CORP,HUNTSVILLE,AL 35801. RP ZHANG, HS (reprint author), ARIZONA STATE UNIV,TEMPE,AZ 85287, USA. RI So, Ronald/B-6698-2008 NR 11 TC 12 Z9 13 U1 0 U2 0 PU AMER INST AERONAUT ASTRONAUT PI RESTON PA 1801 ALEXANDER BELL DRIVE, STE 500, RESTON, VA 22091 SN 0001-1452 J9 AIAA J JI AIAA J. PD JAN PY 1993 VL 31 IS 1 BP 196 EP 199 DI 10.2514/3.11338 PG 4 WC Engineering, Aerospace SC Engineering GA KH576 UT WOS:A1993KH57600031 ER PT J AU PALOSKI, WH BLACK, FO RESCHKE, MF CALKINS, DS SHUPERT, C AF PALOSKI, WH BLACK, FO RESCHKE, MF CALKINS, DS SHUPERT, C TI VESTIBULAR ATAXIA FOLLOWING SHUTTLE FLIGHTS - EFFECTS OF MICROGRAVITY ON OTOLITH-MEDIATED SENSORIMOTOR CONTROL OF POSTURE SO AMERICAN JOURNAL OF OTOLOGY LA English DT Article; Proceedings Paper CT 125TH MEETING OF THE AMERICAN OTOLOGICAL SOC CY APR 11-12, 1992 CL DESERT SPRINGS, CA SP AMER OTOL SOC ID REFLEX; WEIGHTLESSNESS; ADAPTATION; NYSTAGMUS; SUPPORT AB Orbital spaceflight exposes astronauts to an environment in which gravity is reduced to negligible magnitudes of 10(-3) to 10(-6) G. Upon insertion into earth orbit, the abrupt loss of the constant linear acceleration provided by gravity removes the otolith stimulus for vestibular sensation of vertical orientation constantly present on Earth. Since the central nervous system (CNS) assesses spatial orientation by simultaneously interpreting sensory inputs from the vestibular, visual, and proprioceptive systems, loss of the otolith-mediated vertical reference input results in an incorrect estimation of spatial orientation, which, in turn, causes a degradation in movement control. Over time, however, the CNS adapts to the loss of gravitational signals. Upon return to Earth, the vertical reference provided by gravitational stimulation of the otolith organ reappears. As a result, a period of CNS readaptation must occur upon return to terrestrial environment. Among the physiological changes observed during the postflight CNS readaptation period is a disruption of postural equilibrium control. Using a dynamic posturography system (modified NeuroCom EquiTest), 16 astronauts were tested at 60, 30, and 10 days preflight and retested at 1 to 5 hours, and 8 days postflight. All astronauts tested demonstrated decreased postural stability immediately upon return to Earth. The most dramatic increases in postural sway occurred during those sensory conditions in which both the visual and proprioceptive feedback information used for postural control were altered by the dynamic posturography system, requiring reliance primarily upon vestibular function for control of upright stance. Less marked but statistically significant increases in sway were observed under those conditions in which visual and foot support surface inputs alone were altered. Recovery to preflight postural stability levels, which were well within normal clinical limits, occurred in all subjects by 8 days postflight. The results demonstrate that 5- to 10-day losses of gravitational inputs from the vestibular otoliths to the CNS during orbital flight severely disrupt the otolith mediated sensorimotor interactions required for normal terrestrial postural control. Readaptation to normal postural control was complete in all astronaut subjects within 8 days postflight. C1 NASA,LYNDON B JOHNSON SPACE CTR,SPACE BIOMED RES INST,SD5,HOUSTON,TX 77058. KRUG LIFE SCI,HOUSTON,TX. GOOD SAMARITAN HOSP,RS DOW NEUROL SCI INST,PORTLAND,OR. FU NIDCD NIH HHS [DC 00205, NIDCD 1104] NR 26 TC 68 Z9 69 U1 1 U2 2 PU LIPPINCOTT-RAVEN PUBL PI PHILADELPHIA PA 227 EAST WASHINGTON SQ, PHILADELPHIA, PA 19106 SN 0192-9763 J9 AM J OTOL JI Am. J. Otol. PD JAN PY 1993 VL 14 IS 1 BP 9 EP 17 PG 9 WC Otorhinolaryngology SC Otorhinolaryngology GA KG509 UT WOS:A1993KG50900005 PM 8424485 ER PT B AU HALL, DK FOSTER, JL IRONS, JR DABNEY, PW AF HALL, DK FOSTER, JL IRONS, JR DABNEY, PW BE Steffen, K TI AIRBORNE BIDIRECTIONAL RADIANCES OF SNOW-COVERED SURFACES IN MONTANA, USA SO ANNALS OF GLACIOLOGY, VOL 17 LA English DT Proceedings Paper CT 1992 International Symposium on Remote Sensing of Snow and Ice CY MAY 17-22, 1992 CL UNIV COLORADO BOULDER, BOULDER, CO SP INT GLACIOL SOC, UNIV COLORADO BOULDER, AMER SOC PHOTOGRAMMETRY & REMOTE SENSING, AMER GEOPHYS UNION, INT ASSOC PHYS SCI OCEAN, INT ASSOC HYDROL SCI, INT COMMISS SNOW & ICE, INT ASSOC HYDROL SCI, INT COMM REMOTE SENSING & DATA TRANSMISS HO UNIV COLORADO BOULDER C1 NASA,GODDARD SPACE FLIGHT CTR,HYDROL SCI BRANCH,GREENBELT,MD 20771. RI Irons, James/D-8535-2012; Dabney, Philip/C-9976-2013 NR 0 TC 0 Z9 0 U1 0 U2 2 PU INT GLACIOLOGICAL SOC PI CAMBRIDGE PA LENSFIELD RD, CAMBRIDGE, ENGLAND CB2 1ER BN 0-946417-09-1 PY 1993 BP 35 EP 40 PG 6 WC Geosciences, Multidisciplinary; Oceanography; Optics; Water Resources SC Geology; Oceanography; Optics; Water Resources GA BZ49K UT WOS:A1993BZ49K00005 ER PT B AU GLOERSEN, P CAMPBELL, WJ CAVALIERI, DJ COMISO, JC PARKINSON, CL ZWALLY, HJ AF GLOERSEN, P CAMPBELL, WJ CAVALIERI, DJ COMISO, JC PARKINSON, CL ZWALLY, HJ BE Steffen, K TI SATELLITE PASSIVE MICROWAVE OBSERVATIONS AND ANALYSIS OF ARCTIC AND ANTARCTIC SEA-ICE, 1978-1987 SO ANNALS OF GLACIOLOGY, VOL 17 LA English DT Proceedings Paper CT 1992 International Symposium on Remote Sensing of Snow and Ice CY MAY 17-22, 1992 CL UNIV COLORADO BOULDER, BOULDER, CO SP INT GLACIOL SOC, UNIV COLORADO BOULDER, AMER SOC PHOTOGRAMMETRY & REMOTE SENSING, AMER GEOPHYS UNION, INT ASSOC PHYS SCI OCEAN, INT ASSOC HYDROL SCI, INT COMMISS SNOW & ICE, INT ASSOC HYDROL SCI, INT COMM REMOTE SENSING & DATA TRANSMISS HO UNIV COLORADO BOULDER C1 NASA,GODDARD SPACE FLIGHT CTR,HYDROSPHER PROC LAB,GREENBELT,MD 20771. RI Parkinson, Claire/E-1747-2012 OI Parkinson, Claire/0000-0001-6730-4197 NR 0 TC 5 Z9 5 U1 5 U2 10 PU INT GLACIOLOGICAL SOC PI CAMBRIDGE PA LENSFIELD RD, CAMBRIDGE, ENGLAND CB2 1ER BN 0-946417-09-1 PY 1993 BP 149 EP 154 PG 6 WC Geosciences, Multidisciplinary; Oceanography; Optics; Water Resources SC Geology; Oceanography; Optics; Water Resources GA BZ49K UT WOS:A1993BZ49K00022 ER PT B AU FAHNESTOCK, MA BINDSCHADLER, RA AF FAHNESTOCK, MA BINDSCHADLER, RA BE Steffen, K TI DESCRIPTION OF A PROGRAM FOR SAR INVESTIGATION OF THE GREENLAND ICE-SHEET AND AN EXAMPLE OF MARGIN CHANGE DETECTION USING SAR SO ANNALS OF GLACIOLOGY, VOL 17 LA English DT Proceedings Paper CT 1992 International Symposium on Remote Sensing of Snow and Ice CY MAY 17-22, 1992 CL UNIV COLORADO BOULDER, BOULDER, CO SP INT GLACIOL SOC, UNIV COLORADO BOULDER, AMER SOC PHOTOGRAMMETRY & REMOTE SENSING, AMER GEOPHYS UNION, INT ASSOC PHYS SCI OCEAN, INT ASSOC HYDROL SCI, INT COMMISS SNOW & ICE, INT ASSOC HYDROL SCI, INT COMM REMOTE SENSING & DATA TRANSMISS HO UNIV COLORADO BOULDER C1 NASA,GODDARD SPACE FLIGHT CTR,GREENBELT,MD 20771. NR 0 TC 0 Z9 0 U1 0 U2 0 PU INT GLACIOLOGICAL SOC PI CAMBRIDGE PA LENSFIELD RD, CAMBRIDGE, ENGLAND CB2 1ER BN 0-946417-09-1 PY 1993 BP 332 EP 336 PG 5 WC Geosciences, Multidisciplinary; Oceanography; Optics; Water Resources SC Geology; Oceanography; Optics; Water Resources GA BZ49K UT WOS:A1993BZ49K00053 ER PT B AU GARVIN, JB WILLIAMS, RS AF GARVIN, JB WILLIAMS, RS BE Steffen, K TI GEODETIC AIRBORNE LASER ALTIMETRY OF BREIDAMERKURJOKULL AND SKEIDARARJOKULL, ICELAND, AND JAKOBSHAVNS-ISBRAE, WEST-GREENLAND SO ANNALS OF GLACIOLOGY, VOL 17 LA English DT Proceedings Paper CT 1992 International Symposium on Remote Sensing of Snow and Ice CY MAY 17-22, 1992 CL UNIV COLORADO BOULDER, BOULDER, CO SP INT GLACIOL SOC, UNIV COLORADO BOULDER, AMER SOC PHOTOGRAMMETRY & REMOTE SENSING, AMER GEOPHYS UNION, INT ASSOC PHYS SCI OCEAN, INT ASSOC HYDROL SCI, INT COMMISS SNOW & ICE, INT ASSOC HYDROL SCI, INT COMM REMOTE SENSING & DATA TRANSMISS HO UNIV COLORADO BOULDER C1 NASA,GODDARD SPACE FLIGHT CTR,GREENBELT,MD 20771. NR 0 TC 2 Z9 2 U1 0 U2 0 PU INT GLACIOLOGICAL SOC PI CAMBRIDGE PA LENSFIELD RD, CAMBRIDGE, ENGLAND CB2 1ER BN 0-946417-09-1 PY 1993 BP 379 EP 385 PG 7 WC Geosciences, Multidisciplinary; Oceanography; Optics; Water Resources SC Geology; Oceanography; Optics; Water Resources GA BZ49K UT WOS:A1993BZ49K00060 ER PT S AU LISTON, GE BROWN, RL DENT, JD AF LISTON, GE BROWN, RL DENT, JD GP INT GLACIOL SOC INT GLACIOL SOC INT GLACIOL SOC TI A 2-DIMENSIONAL COMPUTATIONAL MODEL OF TURBULENT ATMOSPHERIC SURFACE FLOWS WITH DRIFTING SNOW SO ANNALS OF GLACIOLOGY, VOL 18, 1993: PROCEEDINGS OF THE SYMPOSIUM ON SNOW AND SNOW-RELATED PROBLEMS SE Annals of Glaciology-Series LA English DT Proceedings Paper CT Symposium on Snow and Snow-Related Problems CY SEP 14-18, 1992 CL NAGAOKA, JAPAN SP INT GLACIOL SOC, JAPANESE SOC SNOW & ICE, NIIGATA PREFECTURE, NAGAOKA CITY C1 NASA, GODDARD SPACE FLIGHT CTR, CLIMATE & RADIAT BRANCH, GREENBELT, MD 20771 USA. NR 0 TC 16 Z9 20 U1 0 U2 0 PU INT GLACIOLOGICAL SOC PI CAMBRIDGE PA LENSFIELD RD, CAMBRIDGE CB2 1ER, ENGLAND SN 0260-3055 BN 0-946417-10-5 J9 ANN GLACIOL-SER PY 1993 VL 18 BP 281 EP 286 PG 6 WC Geosciences, Multidisciplinary; Meteorology & Atmospheric Sciences; Water Resources SC Geology; Meteorology & Atmospheric Sciences; Water Resources GA BB01P UT WOS:A1993BB01P00050 ER PT J AU MUSHOTZKY, RF DONE, C POUNDS, KA AF MUSHOTZKY, RF DONE, C POUNDS, KA TI X-RAY-SPECTRA AND TIME VARIABILITY OF ACTIVE GALACTIC NUCLEI SO ANNUAL REVIEW OF ASTRONOMY AND ASTROPHYSICS LA English DT Review DE QUASARS; SEYERT GALAXIES; POWER SPECTRA; RADIATION MECHANISMS ID SEYFERT-GALAXY NGC-1068; THIN ACCRETION DISKS; RADIO-QUIET QUASARS; NON-THERMAL SOURCES; EMISSION-LINE; COLD MATTER; COMPTON REFLECTION; COMPACT SOURCES; BLACK-HOLES; ENERGY-DISTRIBUTIONS C1 UNIV LEICESTER,DEPT PHYS & ASTRON,LEICESTER LE1 7RH,ENGLAND. RP MUSHOTZKY, RF (reprint author), NASA,GODDARD SPACE FLIGHT CTR,HIGH ENERGY PHYS LAB,CODE 666,GREENBELT,MD 20771, USA. RI done, chris/D-4605-2016 OI done, chris/0000-0002-1065-7239 NR 244 TC 358 Z9 359 U1 0 U2 2 PU ANNUAL REVIEWS INC PI PALO ALTO PA 4139 EL CAMINO WAY, PO BOX 10139, PALO ALTO, CA 94303-0139 SN 0066-4146 J9 ANNU REV ASTRON ASTR JI Annu. Rev. Astron. Astrophys. PY 1993 VL 31 BP 717 EP 761 PG 45 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA LX547 UT WOS:A1993LX54700018 ER PT J AU LIEBHOLD, AM ROSSI, RE KEMP, WP AF LIEBHOLD, AM ROSSI, RE KEMP, WP TI GEOSTATISTICS AND GEOGRAPHIC INFORMATION-SYSTEMS IN APPLIED INSECT ECOLOGY SO ANNUAL REVIEW OF ENTOMOLOGY LA English DT Review DE LANDSCAPE ECOLOGY; SPATIAL STATISTICS; COMPUTERS; POPULATION ECOLOGY ID SPATIAL AUTO-CORRELATION; POPULATION-GENETICS; AUTOCORRELATION; GRASSHOPPER; PATTERNS; DISTRIBUTIONS; METHODOLOGY; SIMULATION; VARIOGRAM; BIOLOGY C1 NASA,AMES RES CTR,MOFFETT FIELD,CA 94035. USDA ARS,RANGELAND INSECT LAB,BOZEMAN,MT 59717. RP LIEBHOLD, AM (reprint author), US FOREST SERV,NE FOREST EXPT STN,180 CANFIELD ST,MORGANTOWN,WV 26505, USA. RI Liebhold, Andrew/C-1423-2008 OI Liebhold, Andrew/0000-0001-7427-6534 NR 105 TC 231 Z9 304 U1 4 U2 32 PU ANNUAL REVIEWS INC PI PALO ALTO PA 4139 EL CAMINO WAY, PO BOX 10139, PALO ALTO, CA 94303-0139 SN 0066-4170 J9 ANNU REV ENTOMOL JI Annu. Rev. Entomol. PY 1993 VL 38 BP 303 EP 327 DI 10.1146/annurev.en.38.010193.001511 PG 25 WC Entomology SC Entomology GA KF697 UT WOS:A1993KF69700014 ER PT J AU MANI, M TIWARI, SN DRUMMOND, JP AF MANI, M TIWARI, SN DRUMMOND, JP TI INVESTIGATION OF CHEMICALLY REACTING AND RADIATING SUPERSONIC-FLOW IN CHANNELS SO APPLIED SCIENTIFIC RESEARCH LA English DT Article ID MODEL; CONVECTION AB The two-dimensional time dependent Navier Stokes equations are used to investigate supersonic flows undergoing finite rate chemical Teaction and radiation interaction for a hydrogen-air system. The explicit multi-stage finite volume technique of Jameson is used to advance the governing equations in time until convergence is achieved. The chemistry source term in the species equation is treated implicitly to alleviate the stiffness associated with fast reactions. The multidimensional radiative transfer equations for a nongray model are provided for general configuration, and then reduced for a planar geometry. Both pseudo-gray and nongray models are used to represent the absor-ption-emission characteristics of the participating species. The supersonic inviscid and viscous, nonreacting flows are solved by employing the finite volume technique of Jameson and the unsplit finite difference scheme of MacCormack to determine a convenient numerical procedure for the present study. The specific problem considered is of the flow in a channel with a 10' compression-expansion ramp. The calculated results are compared with the results of an upwind scheme and no significant differences are noted. The problem of chemically reacting and radiating flows are solved for the flow of premixed hydrogen-air through a channel with parallel boundaries, and a channel with a compression comer. Results obtained for specific conditions indicate that the radiative interaction can have a significant influence on the entire flowfield. C1 OLD DOMINION UNIV,DEPT MECH ENGN & MECH,NORFOLK,VA 23529. MCDONNELL AIRCRAFT CORP,DEPT PROPULS & THERMODYNAM,ST LOUIS,MO 63166. NASA,LANGLEY RES CTR,DIV HIGH SPEED AERODYNAM,COMPUTAT METHODS BRANCH,HAMPTON,VA 23665. NR 37 TC 0 Z9 0 U1 0 U2 0 PU KLUWER ACADEMIC PUBL PI DORDRECHT PA SPUIBOULEVARD 50, PO BOX 17, 3300 AA DORDRECHT, NETHERLANDS SN 0003-6994 J9 APPL SCI RES JI Appl. Sci. Res. PD JAN PY 1993 VL 50 IS 1 BP 43 EP 68 DI 10.1007/BF01086452 PG 26 WC Thermodynamics; Mechanics SC Thermodynamics; Mechanics GA KK022 UT WOS:A1993KK02200003 ER PT J AU YAO, H WOOLLAM, JA WANG, PJ TEIWANI, MJ ALTEROVITZ, SA AF YAO, H WOOLLAM, JA WANG, PJ TEIWANI, MJ ALTEROVITZ, SA TI SPECTROSCOPIC ELLIPSOMETRIC CHARACTERIZATION OF SI/SI1-XGEX STRAINED-LAYER SUPERLATTICES SO APPLIED SURFACE SCIENCE LA English DT Article; Proceedings Paper CT SYMP ON DIAGNOSTIC TECHNIQUES FOR SEMICONDUCTOR MATERIALS ANALYSIS AND FABRICATION PROCESS CONTROL, AT THE 1992 SPRING CONF OF THE EUROPEAN MATERIALS RESEARCH SOC CY JUN 02-05, 1992 CL STRASBOURG, FRANCE SP EUROPEAN MAT RES SOC ID SIXGE1-X ALLOYS; SI; GE; EPITAXY AB Spectroscopic ellipsometry (SE) was employed to characterize Si/Si1-xGex strained-layer superlattices. An algorithm was developed, using the available optical constants measured at a number of fixed x values of Ge composition, to compute the dielectric function spectrum of Si1-xGex at an arbitrary x value in the spectral range 1.7 to 5.6 eV. The ellipsometrically determined superlattice thicknesses and alloy compositional fractions were in excellent agreement with results from high-resolution X-ray diffraction studies. The silicon surfaces of the superlattices were subjected to a 9: 1 HF cleaning prior to the SE measurements. The HF solution removed silicon oxides on the semiconductor surface, and terminated the Si surface with hydrogen-silicon bonds, which were monitored over a period of several weeks, after the HF cleaning, by SE measurements. An equivalent dielectric layer model was established to describe the hydrogen-terminated Si surface layer. The passivated Si surface remained unchanged for > 2 h, and very little surface oxidation took place even over 3 to 4 days. C1 UNIV NEBRASKA,DEPT ELECT ENGN,LINCOLN,NE 68588. IBM CORP,SEMICOND R & D CTR,HOPEWELL JCT,NY 12533. NASA,LEWIS RES CTR,CLEVELAND,OH 44135. RP YAO, H (reprint author), UNIV NEBRASKA,CTR MICROELECTR & OPT MAT RES,LINCOLN,NE 68588, USA. NR 15 TC 15 Z9 15 U1 1 U2 2 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 JAN PY 1993 VL 63 IS 1-4 BP 52 EP 56 DI 10.1016/0169-4332(93)90063-H PG 5 WC Chemistry, Physical; Materials Science, Coatings & Films; Physics, Applied; Physics, Condensed Matter SC Chemistry; Materials Science; Physics GA KF034 UT WOS:A1993KF03400010 ER PT S AU STERLING, TL MACDONALD, MJ AF STERLING, TL MACDONALD, MJ BE Cosnard, M Ebcioglu, K Gaudiot, JL TI THE REALITIES OF HIGH-PERFORMANCE COMPUTING AND DATAFLOWS ROLE IN IT - LESSONS FROM THE NASA HPCC PROGRAM SO ARCHITECTURES AND COMPILATION TECHNIQUES FOR FINE AND MEDIUM GRAIN PARALLELISM SE IFIP TRANSACTIONS A-COMPUTER SCIENCE AND TECHNOLOGY LA English DT Proceedings Paper CT WORKING CONF ON ARCHITECTURES AND COMPILATION TECHNIQUES FOR FINE AND MEDIUM GRAIN PARALLELISM CY JAN 20-22, 1993 CL ORLANDO, FL SP INT FEDERAT INFORMAT PROC DE MULTIPLE DATA STREAM ARCHITECTURES (MULTIPROCESSORS); CONCURRENT PROGRAMMING; PHYSICAL SCIENCES AND ENGINEERING RP STERLING, TL (reprint author), UNIV SPACE RES ASSOC,CESDIS,NASA,HIGH PERFORMANCE COMP & COMMUN PROGRAM,WASHINGTON,DC, USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU ELSEVIER SCIENCE PUBL B V PI AMSTERDAM PA AMSTERDAM SN 0926-5473 BN 0-444-88464-5 J9 IFIP TRANS A PY 1993 VL 23 BP 165 EP 176 PG 12 GA BY48U UT WOS:A1993BY48U00015 ER PT B AU JONES, JA CHRISTOPHILOS, V AF JONES, JA CHRISTOPHILOS, V BE Geshwiler, M TI HIGH-EFFICIENCY REGENERATIVE ADSORPTION HEAT-PUMP SO ASHRAE TRANSACTIONS 1993, VOL 99, PT 1 SE ASHRAE TRANSACTIONS LA English DT Proceedings Paper CT 1993 Winter Meeting of the American-Society-of-Heating-Refrigerating-and-Air-Conditioning-Engineers -Incorporated CY JAN 23-27, 1993 CL CHICAGO, IL SP AMER SOC HEATING REFRIGERATING & AIR CONDITIONING ENGINEERS INC C1 JET PROP LAB,APPL MECH TECHNOL SECT,PASADENA,CA 91109. NR 0 TC 8 Z9 8 U1 0 U2 0 PU AMER SOC HEATING, REFRIGERATING AND AIR-CONDITIONING ENGS PI ATLANTA PA 1791 TULLIE CIRCLE NE, ATLANTA, GA 30329 J9 ASHRAE TRAN PY 1993 VL 99 BP 54 EP 60 PN 1 PG 7 WC Construction & Building Technology; Engineering, Mechanical SC Construction & Building Technology; Engineering GA BA39G UT WOS:A1993BA39G00006 ER PT J AU GENTILE, MT AF GENTILE, MT GP AMER SOC QUAL CONTROL TI USING QUALITY TOOLS IN CONSTRUCTION MANAGEMENT SO ASQC 47TH ANNUAL QUALITY CONGRESS LA English DT Proceedings Paper CT 47th Annual Quality Congress of the American-Society-for-Quality-Control - Proven Results Through Total Quality CY MAY 24-26, 1993 CL BOSTON, MA SP AMER SOC QUAL CONTROL C1 NASA,GEORGE C MARSHALL SPACE FLIGHT CTR,STONE & WEBSTER ENGN CORP,HUNTSVILLE,AL 35812. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER SOC QUALITY CONTROL PI MILWAUKEE PA 611 E WISCONSIN AVENUE, MILWAUKEE, WI 53202 PY 1993 BP 600 EP 606 PG 7 WC Engineering, Industrial; Management SC Engineering; Business & Economics GA BB77U UT WOS:A1993BB77U00083 ER PT B AU KLINGLESMITH, DA NIEDNER, MB GRAYZECK, E ARONSSON, M NEWBURN, RL WARNOCK, A AF KLINGLESMITH, DA NIEDNER, MB GRAYZECK, E ARONSSON, M NEWBURN, RL WARNOCK, A BE Hanisch, RJ Brissenden, RJV Barnes, J TI THE DIGITAL ARCHIVE OF THE INTERNATIONAL HALLEY WATCH SO ASTRONOMICAL DATA ANALYSIS SOFTWARE AND SYSTEMS II SE ASTRONOMICAL SOCIETY OF THE PACIFIC CONFERENCE SERIES LA English DT Proceedings Paper CT 2nd Conference on Astronomical Data Analysis Software and Systems - ADASS II CY NOV 02-04, 1992 CL BOSTON, MA SP NASA, NATL OPT ASTRON OBSERV, NATL SCI FDN, SMITHSONIAN ASTROPHYS OBSERV, SPACE TELESCOPE SCI INST C1 NASA,GODDARD SPACE FLIGHT CTR,GREENBELT,MD 20771. RI Niedner, Malcolm/E-2244-2012 NR 0 TC 0 Z9 0 U1 0 U2 0 PU ASTRONOMICAL SOC PACIFIC PI SAN FRANCISCO PA 390 ASHTON AVE, SAN FRANCISCO, CA 94112 BN 0-937707-71-6 J9 ASTR SOC P PY 1993 VL 52 BP 13 EP 20 PG 8 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA BZ94Z UT WOS:A1993BZ94Z00002 ER PT B AU SMITH, EP HINTZEN, P CHENG, KP ANGIONE, R TALBERT, F AF SMITH, EP HINTZEN, P CHENG, KP ANGIONE, R TALBERT, F BE Hanisch, RJ Brissenden, RJV Barnes, J TI WIDE-FIELD DIRECT CCD OBSERVATIONS SUPPORTING THE ASTRO-1 ULTRAVIOLET IMAGING TELESCOPE SO ASTRONOMICAL DATA ANALYSIS SOFTWARE AND SYSTEMS II SE ASTRONOMICAL SOCIETY OF THE PACIFIC CONFERENCE SERIES LA English DT Proceedings Paper CT 2nd Conference on Astronomical Data Analysis Software and Systems - ADASS II CY NOV 02-04, 1992 CL BOSTON, MA SP NASA, NATL OPT ASTRON OBSERV, NATL SCI FDN, SMITHSONIAN ASTROPHYS OBSERV, SPACE TELESCOPE SCI INST C1 NASA,GODDARD SPACE FLIGHT CTR,ASTRON & SOLAR PHYS LAB,GREENBELT,MD 20771. NR 0 TC 0 Z9 0 U1 0 U2 0 PU ASTRONOMICAL SOC PACIFIC PI SAN FRANCISCO PA 390 ASHTON AVE, SAN FRANCISCO, CA 94112 BN 0-937707-71-6 J9 ASTR SOC P PY 1993 VL 52 BP 31 EP 33 PG 3 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA BZ94Z UT WOS:A1993BZ94Z00005 ER PT B AU JORDAN, JM JENNINGS, DG MCGLYNN, TA RUGGIERO, NG SERLEMITSOS, TA AF JORDAN, JM JENNINGS, DG MCGLYNN, TA RUGGIERO, NG SERLEMITSOS, TA BE Hanisch, RJ Brissenden, RJV Barnes, J TI A GENERIC ARCHIVE PROTOCOL AND AN IMPLEMENTATION SO ASTRONOMICAL DATA ANALYSIS SOFTWARE AND SYSTEMS II SE ASTRONOMICAL SOCIETY OF THE PACIFIC CONFERENCE SERIES LA English DT Proceedings Paper CT 2nd Conference on Astronomical Data Analysis Software and Systems - ADASS II CY NOV 02-04, 1992 CL BOSTON, MA SP NASA, NATL OPT ASTRON OBSERV, NATL SCI FDN, SMITHSONIAN ASTROPHYS OBSERV, SPACE TELESCOPE SCI INST C1 NASA,GODDARD SPACE FLIGHT CTR,GSFC,CSC,COSSC,GREENBELT,MD 20771. NR 0 TC 0 Z9 0 U1 0 U2 0 PU ASTRONOMICAL SOC PACIFIC PI SAN FRANCISCO PA 390 ASHTON AVE, SAN FRANCISCO, CA 94112 BN 0-937707-71-6 J9 ASTR SOC P PY 1993 VL 52 BP 82 EP 86 PG 5 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA BZ94Z UT WOS:A1993BZ94Z00015 ER PT B AU WARNOCK, A VANSTEENBERG, ME BROTZMAN, LE GASS, JE KOVALSKY, D GIOVANE, F AF WARNOCK, A VANSTEENBERG, ME BROTZMAN, LE GASS, JE KOVALSKY, D GIOVANE, F BE Hanisch, RJ Brissenden, RJV Barnes, J TI STELAR - AN EXPERIMENT IN THE ELECTRONIC DISTRIBUTION OF ASTRONOMICAL LITERATURE SO ASTRONOMICAL DATA ANALYSIS SOFTWARE AND SYSTEMS II SE ASTRONOMICAL SOCIETY OF THE PACIFIC CONFERENCE SERIES LA English DT Proceedings Paper CT 2nd Conference on Astronomical Data Analysis Software and Systems - ADASS II CY NOV 02-04, 1992 CL BOSTON, MA SP NASA, NATL OPT ASTRON OBSERV, NATL SCI FDN, SMITHSONIAN ASTROPHYS OBSERV, SPACE TELESCOPE SCI INST C1 NASA,GODDARD SPACE FLIGHT CTR,HUGHES STX,GREENBELT,MD 20771. NR 0 TC 4 Z9 4 U1 0 U2 0 PU ASTRONOMICAL SOC PACIFIC PI SAN FRANCISCO PA 390 ASHTON AVE, SAN FRANCISCO, CA 94112 BN 0-937707-71-6 J9 ASTR SOC P PY 1993 VL 52 BP 137 EP 141 PG 5 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA BZ94Z UT WOS:A1993BZ94Z00025 ER PT B AU ROTS, AH AF ROTS, AH BE Hanisch, RJ Brissenden, RJV Barnes, J TI KHOROS SOFTWARE SPECIFICATION FORMAT AND INTEROPERABILITY SO ASTRONOMICAL DATA ANALYSIS SOFTWARE AND SYSTEMS II SE ASTRONOMICAL SOCIETY OF THE PACIFIC CONFERENCE SERIES LA English DT Proceedings Paper CT 2nd Conference on Astronomical Data Analysis Software and Systems - ADASS II CY NOV 02-04, 1992 CL BOSTON, MA SP NASA, NATL OPT ASTRON OBSERV, NATL SCI FDN, SMITHSONIAN ASTROPHYS OBSERV, SPACE TELESCOPE SCI INST C1 NASA,GODDARD SPACE FLIGHT CTR,HIGH ENERGY PHYS LAB,UNIV SPACE RES ASSOC,GREENBELT,MD 20771. NR 0 TC 0 Z9 0 U1 0 U2 0 PU ASTRONOMICAL SOC PACIFIC PI SAN FRANCISCO PA 390 ASHTON AVE, SAN FRANCISCO, CA 94112 BN 0-937707-71-6 J9 ASTR SOC P PY 1993 VL 52 BP 194 EP 198 PG 5 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA BZ94Z UT WOS:A1993BZ94Z00032 ER PT B AU LANDSMAN, WB AF LANDSMAN, WB BE Hanisch, RJ Brissenden, RJV Barnes, J TI THE IDL ASTRONOMY USER LIBRARY SO ASTRONOMICAL DATA ANALYSIS SOFTWARE AND SYSTEMS II SE ASTRONOMICAL SOCIETY OF THE PACIFIC CONFERENCE SERIES LA English DT Proceedings Paper CT 2nd Conference on Astronomical Data Analysis Software and Systems - ADASS II CY NOV 02-04, 1992 CL BOSTON, MA SP NASA, NATL OPT ASTRON OBSERV, NATL SCI FDN, SMITHSONIAN ASTROPHYS OBSERV, SPACE TELESCOPE SCI INST C1 HUGHES STX CO,NASA,GSFC,GREENBELT,MD 20771. NR 0 TC 102 Z9 102 U1 0 U2 0 PU ASTRONOMICAL SOC PACIFIC PI SAN FRANCISCO PA 390 ASHTON AVE, SAN FRANCISCO, CA 94112 BN 0-937707-71-6 J9 ASTR SOC P PY 1993 VL 52 BP 246 EP 248 PG 3 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA BZ94Z UT WOS:A1993BZ94Z00043 ER PT B AU LAUBENTHAL, NA MCDONALD, L SREEKUMAR, P BERTSCH, D ETIENNE, A LAL, N MATTOX, J NOLAN, P FIERRO, J AF LAUBENTHAL, NA MCDONALD, L SREEKUMAR, P BERTSCH, D ETIENNE, A LAL, N MATTOX, J NOLAN, P FIERRO, J BE Hanisch, RJ Brissenden, RJV Barnes, J TI GRO EGRET DATA-ANALYSIS SOFTWARE - AN INTEGRATED SYSTEM OF CUSTOM AND COMMERCIAL SOFTWARE USING STANDARD INTERFACES SO ASTRONOMICAL DATA ANALYSIS SOFTWARE AND SYSTEMS II SE ASTRONOMICAL SOCIETY OF THE PACIFIC CONFERENCE SERIES LA English DT Proceedings Paper CT 2nd Conference on Astronomical Data Analysis Software and Systems - ADASS II CY NOV 02-04, 1992 CL BOSTON, MA SP NASA, NATL OPT ASTRON OBSERV, NATL SCI FDN, SMITHSONIAN ASTROPHYS OBSERV, SPACE TELESCOPE SCI INST C1 NASA,GODDARD SPACE FLIGHT CTR,GREENBELT,MD 20771. NR 0 TC 1 Z9 1 U1 0 U2 0 PU ASTRONOMICAL SOC PACIFIC PI SAN FRANCISCO PA 390 ASHTON AVE, SAN FRANCISCO, CA 94112 BN 0-937707-71-6 J9 ASTR SOC P PY 1993 VL 52 BP 249 EP 253 PG 5 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA BZ94Z UT WOS:A1993BZ94Z00044 ER PT B AU EWING, JA ISAACMAN, R GALES, JM CHINTALA, S KRYSZAKSERVIN, P GALUK, KG AF EWING, JA ISAACMAN, R GALES, JM CHINTALA, S KRYSZAKSERVIN, P GALUK, KG BE Hanisch, RJ Brissenden, RJV Barnes, J TI AN IDL-BASED ANALYSIS PACKAGE FOR COBE AND OTHER SKYCUBE-FORMATTED ASTRONOMICAL DATA SO ASTRONOMICAL DATA ANALYSIS SOFTWARE AND SYSTEMS II SE ASTRONOMICAL SOCIETY OF THE PACIFIC CONFERENCE SERIES LA English DT Proceedings Paper CT 2nd Conference on Astronomical Data Analysis Software and Systems - ADASS II CY NOV 02-04, 1992 CL BOSTON, MA SP NASA, NATL OPT ASTRON OBSERV, NATL SCI FDN, SMITHSONIAN ASTROPHYS OBSERV, SPACE TELESCOPE SCI INST C1 APPL RES CORP,GODDARD SPACE FLIGHT CTR,GREENBELT,MD 20771. NR 0 TC 0 Z9 0 U1 0 U2 0 PU ASTRONOMICAL SOC PACIFIC PI SAN FRANCISCO PA 390 ASHTON AVE, SAN FRANCISCO, CA 94112 BN 0-937707-71-6 J9 ASTR SOC P PY 1993 VL 52 BP 367 EP 372 PG 6 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA BZ94Z UT WOS:A1993BZ94Z00062 ER PT B AU MCGLYNN, T JORDAN, J JENNINGS, D RUGGIERO, N SERLEMITSOS, T AF MCGLYNN, T JORDAN, J JENNINGS, D RUGGIERO, N SERLEMITSOS, T BE Hanisch, RJ Brissenden, RJV Barnes, J TI GAMMACORE - THE COMPTON OBSERVATORY RESEARCH ENVIRONMENT SO ASTRONOMICAL DATA ANALYSIS SOFTWARE AND SYSTEMS II SE ASTRONOMICAL SOCIETY OF THE PACIFIC CONFERENCE SERIES LA English DT Proceedings Paper CT 2nd Conference on Astronomical Data Analysis Software and Systems - ADASS II CY NOV 02-04, 1992 CL BOSTON, MA SP NASA, NATL OPT ASTRON OBSERV, NATL SCI FDN, SMITHSONIAN ASTROPHYS OBSERV, SPACE TELESCOPE SCI INST C1 NASA,GODDARD SPACE FLIGHT CTR,COMPTON OBSERV SCI SUPPORT CTR,GREENBELT,MD 20771. NR 0 TC 0 Z9 0 U1 0 U2 0 PU ASTRONOMICAL SOC PACIFIC PI SAN FRANCISCO PA 390 ASHTON AVE, SAN FRANCISCO, CA 94112 BN 0-937707-71-6 J9 ASTR SOC P PY 1993 VL 52 BP 373 EP 378 PG 6 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA BZ94Z UT WOS:A1993BZ94Z00063 ER PT B AU WHITE, N BARRETT, P JACOBS, P ONEEL, B AF WHITE, N BARRETT, P JACOBS, P ONEEL, B BE Hanisch, RJ Brissenden, RJV Barnes, J TI THE HEASARC GRAPHICAL USER-INTERFACE SO ASTRONOMICAL DATA ANALYSIS SOFTWARE AND SYSTEMS II SE ASTRONOMICAL SOCIETY OF THE PACIFIC CONFERENCE SERIES LA English DT Proceedings Paper CT 2nd Conference on Astronomical Data Analysis Software and Systems - ADASS II CY NOV 02-04, 1992 CL BOSTON, MA SP NASA, NATL OPT ASTRON OBSERV, NATL SCI FDN, SMITHSONIAN ASTROPHYS OBSERV, SPACE TELESCOPE SCI INST C1 NASA,GODDARD SPACE FLIGHT CTR,HEASARC,GREENBELT,MD 20771. RI White, Nicholas/B-6428-2012 OI White, Nicholas/0000-0003-3853-3462 NR 0 TC 0 Z9 0 U1 0 U2 0 PU ASTRONOMICAL SOC PACIFIC PI SAN FRANCISCO PA 390 ASHTON AVE, SAN FRANCISCO, CA 94112 BN 0-937707-71-6 J9 ASTR SOC P PY 1993 VL 52 BP 387 EP 390 PG 4 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA BZ94Z UT WOS:A1993BZ94Z00066 ER PT B AU VAROSI, F GEZARI, DY AF VAROSI, F GEZARI, DY BE Hanisch, RJ Brissenden, RJV Barnes, J TI MOSAIC - AN IDL SOFTWARE PACKAGE FOR MANIPULATING COLLECTIONS OF IMAGES SO ASTRONOMICAL DATA ANALYSIS SOFTWARE AND SYSTEMS II SE ASTRONOMICAL SOCIETY OF THE PACIFIC CONFERENCE SERIES LA English DT Proceedings Paper CT 2nd Conference on Astronomical Data Analysis Software and Systems - ADASS II CY NOV 02-04, 1992 CL BOSTON, MA SP NASA, NATL OPT ASTRON OBSERV, NATL SCI FDN, SMITHSONIAN ASTROPHYS OBSERV, SPACE TELESCOPE SCI INST C1 NASA,GODDARD SPACE FLIGHT CTR,INFRARED ASTROPHYS BRANCH,GREENBELT,MD 20771. NR 0 TC 5 Z9 5 U1 0 U2 0 PU ASTRONOMICAL SOC PACIFIC PI SAN FRANCISCO PA 390 ASHTON AVE, SAN FRANCISCO, CA 94112 BN 0-937707-71-6 J9 ASTR SOC P PY 1993 VL 52 BP 393 EP 397 PG 5 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA BZ94Z UT WOS:A1993BZ94Z00067 ER PT B AU VAROSI, F LANDSMAN, WB AF VAROSI, F LANDSMAN, WB BE Hanisch, RJ Brissenden, RJV Barnes, J TI AN IDL BASED IMAGE DECONVOLUTION SOFTWARE PACKAGE SO ASTRONOMICAL DATA ANALYSIS SOFTWARE AND SYSTEMS II SE ASTRONOMICAL SOCIETY OF THE PACIFIC CONFERENCE SERIES LA English DT Proceedings Paper CT 2nd Conference on Astronomical Data Analysis Software and Systems - ADASS II CY NOV 02-04, 1992 CL BOSTON, MA SP NASA, NATL OPT ASTRON OBSERV, NATL SCI FDN, SMITHSONIAN ASTROPHYS OBSERV, SPACE TELESCOPE SCI INST C1 HUGHES STX CO,NASA,GSFC,GREENBELT,MD 20771. NR 0 TC 6 Z9 6 U1 1 U2 1 PU ASTRONOMICAL SOC PACIFIC PI SAN FRANCISCO PA 390 ASHTON AVE, SAN FRANCISCO, CA 94112 BN 0-937707-71-6 J9 ASTR SOC P PY 1993 VL 52 BP 515 EP 519 PG 5 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA BZ94Z UT WOS:A1993BZ94Z00091 ER PT B AU PENCE, W BLACKBURN, JK GREENE, E AF PENCE, W BLACKBURN, JK GREENE, E BE Hanisch, RJ Brissenden, RJV Barnes, J TI FTOOLS - A FITS UTILITY PACKAGE FOR MULTIPLE ENVIRONMENTS SO ASTRONOMICAL DATA ANALYSIS SOFTWARE AND SYSTEMS II SE ASTRONOMICAL SOCIETY OF THE PACIFIC CONFERENCE SERIES LA English DT Proceedings Paper CT 2nd Conference on Astronomical Data Analysis Software and Systems - ADASS II CY NOV 02-04, 1992 CL BOSTON, MA SP NASA, NATL OPT ASTRON OBSERV, NATL SCI FDN, SMITHSONIAN ASTROPHYS OBSERV, SPACE TELESCOPE SCI INST C1 NASA,GODDARD SPACE FLIGHT CTR,GSFC,HEASARC,GREENBELT,MD 20771. NR 0 TC 3 Z9 3 U1 0 U2 0 PU ASTRONOMICAL SOC PACIFIC PI SAN FRANCISCO PA 390 ASHTON AVE, SAN FRANCISCO, CA 94112 BN 0-937707-71-6 J9 ASTR SOC P PY 1993 VL 52 BP 541 EP 542 PG 2 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA BZ94Z UT WOS:A1993BZ94Z00097 ER PT B AU JENNINGS, DG JORDAN, JM MCGLYNN, TA RUGGIERO, NG SERLEMITSOS, TA AF JENNINGS, DG JORDAN, JM MCGLYNN, TA RUGGIERO, NG SERLEMITSOS, TA BE Hanisch, RJ Brissenden, RJV Barnes, J TI FITS DATA CONVERSION EFFORTS AT THE COMPTON OBSERVATORY SCIENCE SUPPORT CENTER SO ASTRONOMICAL DATA ANALYSIS SOFTWARE AND SYSTEMS II SE ASTRONOMICAL SOCIETY OF THE PACIFIC CONFERENCE SERIES LA English DT Proceedings Paper CT 2nd Conference on Astronomical Data Analysis Software and Systems - ADASS II CY NOV 02-04, 1992 CL BOSTON, MA SP NASA, NATL OPT ASTRON OBSERV, NATL SCI FDN, SMITHSONIAN ASTROPHYS OBSERV, SPACE TELESCOPE SCI INST C1 NASA,GODDARD SPACE FLIGHT CTR,GSFC,CSC,COSSC,GREENBELT,MD 20771. NR 0 TC 0 Z9 0 U1 0 U2 0 PU ASTRONOMICAL SOC PACIFIC PI SAN FRANCISCO PA 390 ASHTON AVE, SAN FRANCISCO, CA 94112 BN 0-937707-71-6 J9 ASTR SOC P PY 1993 VL 52 BP 543 EP 548 PG 6 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA BZ94Z UT WOS:A1993BZ94Z00098 ER PT B AU CORCORAN, MF PENCE, W WHITE, R CONROY, M AF CORCORAN, MF PENCE, W WHITE, R CONROY, M BE Hanisch, RJ Brissenden, RJV Barnes, J TI THE ROSAT IMPLEMENTATION OF A PROPOSED MULTIMISSION X-RAY DATA FORMAT SO ASTRONOMICAL DATA ANALYSIS SOFTWARE AND SYSTEMS II SE ASTRONOMICAL SOCIETY OF THE PACIFIC CONFERENCE SERIES LA English DT Proceedings Paper CT 2nd Conference on Astronomical Data Analysis Software and Systems - ADASS II CY NOV 02-04, 1992 CL BOSTON, MA SP NASA, NATL OPT ASTRON OBSERV, NATL SCI FDN, SMITHSONIAN ASTROPHYS OBSERV, SPACE TELESCOPE SCI INST C1 GSFC,GREENBELT,MD 20771. NR 0 TC 0 Z9 0 U1 0 U2 0 PU ASTRONOMICAL SOC PACIFIC PI SAN FRANCISCO PA 390 ASHTON AVE, SAN FRANCISCO, CA 94112 BN 0-937707-71-6 J9 ASTR SOC P PY 1993 VL 52 BP 549 EP 552 PG 4 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA BZ94Z UT WOS:A1993BZ94Z00099 ER PT B AU BREGMAN, J AF BREGMAN, J BE Kwok, S TI INFRARED OBSERVATIONS OF COMETARY DUST AND ICE SO ASTRONOMICAL INFRARED SPECTROSCOPY: FUTURE OBSERVATIONAL DIRECTIONS SE ASTRONOMICAL SOCIETY OF THE PACIFIC CONFERENCE SERIES LA English DT Proceedings Paper CT Conference on Astronomical Infrared Spectroscopy: Future Observational Directions CY JUN 16-19, 1992 CL UNIV CALGARY CAMPUS, CALGARY, CANADA HO UNIV CALGARY CAMPUS C1 NASA,AMES RES CTR,DIV SPACE SCI,MOFFETT FIELD,CA 94035. NR 0 TC 0 Z9 0 U1 0 U2 0 PU ASTRONOMICAL SOC PACIFIC PI SAN FRANCISCO PA 390 ASHTON AVE, SAN FRANCISCO, CA 94112 BN 0-937707-60-0 J9 ASTR SOC P PY 1993 VL 41 BP 11 EP 19 PG 9 WC Astronomy & Astrophysics; Physics, Atomic, Molecular & Chemical; Spectroscopy SC Astronomy & Astrophysics; Physics; Spectroscopy GA BZ94R UT WOS:A1993BZ94R00002 ER PT B AU CRUIKSHANK, DP AF CRUIKSHANK, DP BE Kwok, S TI ICY BODIES IN THE SOLAR-SYSTEM - PRESENT AND FUTURE OF INFRARED STUDIES SO ASTRONOMICAL INFRARED SPECTROSCOPY: FUTURE OBSERVATIONAL DIRECTIONS SE ASTRONOMICAL SOCIETY OF THE PACIFIC CONFERENCE SERIES LA English DT Proceedings Paper CT Conference on Astronomical Infrared Spectroscopy: Future Observational Directions CY JUN 16-19, 1992 CL UNIV CALGARY CAMPUS, CALGARY, CANADA HO UNIV CALGARY CAMPUS C1 NASA,AMES RES CTR,MOFFETT FIELD,CA 94036. NR 0 TC 0 Z9 0 U1 0 U2 0 PU ASTRONOMICAL SOC PACIFIC PI SAN FRANCISCO PA 390 ASHTON AVE, SAN FRANCISCO, CA 94112 BN 0-937707-60-0 J9 ASTR SOC P PY 1993 VL 41 BP 21 EP 28 PG 8 WC Astronomy & Astrophysics; Physics, Atomic, Molecular & Chemical; Spectroscopy SC Astronomy & Astrophysics; Physics; Spectroscopy GA BZ94R UT WOS:A1993BZ94R00003 ER PT B AU HANNER, MS LYNCH, DK RUSSELL, RW HACKWELL, JA AF HANNER, MS LYNCH, DK RUSSELL, RW HACKWELL, JA BE Kwok, S TI THE 10-MICRON SILICATE EMISSION FEATURE IN COMETS SO ASTRONOMICAL INFRARED SPECTROSCOPY: FUTURE OBSERVATIONAL DIRECTIONS SE ASTRONOMICAL SOCIETY OF THE PACIFIC CONFERENCE SERIES LA English DT Proceedings Paper CT Conference on Astronomical Infrared Spectroscopy: Future Observational Directions CY JUN 16-19, 1992 CL UNIV CALGARY CAMPUS, CALGARY, CANADA HO UNIV CALGARY CAMPUS C1 JET PROP LAB,PASADENA,CA 91109. NR 0 TC 0 Z9 0 U1 0 U2 0 PU ASTRONOMICAL SOC PACIFIC PI SAN FRANCISCO PA 390 ASHTON AVE, SAN FRANCISCO, CA 94112 BN 0-937707-60-0 J9 ASTR SOC P PY 1993 VL 41 BP 49 EP 50 PG 2 WC Astronomy & Astrophysics; Physics, Atomic, Molecular & Chemical; Spectroscopy SC Astronomy & Astrophysics; Physics; Spectroscopy GA BZ94R UT WOS:A1993BZ94R00007 ER PT B AU PENDLETON, YJ AF PENDLETON, YJ BE Kwok, S TI ORGANICS IN THE DIFFUSE INTERSTELLAR-MEDIUM SO ASTRONOMICAL INFRARED SPECTROSCOPY: FUTURE OBSERVATIONAL DIRECTIONS SE ASTRONOMICAL SOCIETY OF THE PACIFIC CONFERENCE SERIES LA English DT Proceedings Paper CT Conference on Astronomical Infrared Spectroscopy: Future Observational Directions CY JUN 16-19, 1992 CL UNIV CALGARY CAMPUS, CALGARY, CANADA HO UNIV CALGARY CAMPUS C1 NASA,AMES RES CTR,MOFFETT FIELD,CA 94035. NR 0 TC 3 Z9 3 U1 0 U2 0 PU ASTRONOMICAL SOC PACIFIC PI SAN FRANCISCO PA 390 ASHTON AVE, SAN FRANCISCO, CA 94112 BN 0-937707-60-0 J9 ASTR SOC P PY 1993 VL 41 BP 171 EP 179 PG 9 WC Astronomy & Astrophysics; Physics, Atomic, Molecular & Chemical; Spectroscopy SC Astronomy & Astrophysics; Physics; Spectroscopy GA BZ94R UT WOS:A1993BZ94R00035 ER PT B AU SANDFORD, SA AF SANDFORD, SA BE Kwok, S TI INTERSTELLAR ICES, THEIR PROCESSING, AND THEIR RELATIONSHIP TO REFRACTORY DUST SO ASTRONOMICAL INFRARED SPECTROSCOPY: FUTURE OBSERVATIONAL DIRECTIONS SE ASTRONOMICAL SOCIETY OF THE PACIFIC CONFERENCE SERIES LA English DT Proceedings Paper CT Conference on Astronomical Infrared Spectroscopy: Future Observational Directions CY JUN 16-19, 1992 CL UNIV CALGARY CAMPUS, CALGARY, CANADA HO UNIV CALGARY CAMPUS C1 NASA,AMES RES CTR,MOFFETT FIELD,CA 94035. NR 0 TC 5 Z9 5 U1 0 U2 0 PU ASTRONOMICAL SOC PACIFIC PI SAN FRANCISCO PA 390 ASHTON AVE, SAN FRANCISCO, CA 94112 BN 0-937707-60-0 J9 ASTR SOC P PY 1993 VL 41 BP 181 EP 188 PG 8 WC Astronomy & Astrophysics; Physics, Atomic, Molecular & Chemical; Spectroscopy SC Astronomy & Astrophysics; Physics; Spectroscopy GA BZ94R UT WOS:A1993BZ94R00036 ER PT B AU ALLAMANDOLA, LJ AF ALLAMANDOLA, LJ BE Kwok, S TI DUST, PAHS, AND ISO SO ASTRONOMICAL INFRARED SPECTROSCOPY: FUTURE OBSERVATIONAL DIRECTIONS SE ASTRONOMICAL SOCIETY OF THE PACIFIC CONFERENCE SERIES LA English DT Proceedings Paper CT Conference on Astronomical Infrared Spectroscopy: Future Observational Directions CY JUN 16-19, 1992 CL UNIV CALGARY CAMPUS, CALGARY, CANADA HO UNIV CALGARY CAMPUS C1 NASA,AMES RES CTR,MOFFETT FIELD,CA 94035. NR 0 TC 3 Z9 3 U1 0 U2 0 PU ASTRONOMICAL SOC PACIFIC PI SAN FRANCISCO PA 390 ASHTON AVE, SAN FRANCISCO, CA 94112 BN 0-937707-60-0 J9 ASTR SOC P PY 1993 VL 41 BP 197 EP 206 PG 10 WC Astronomy & Astrophysics; Physics, Atomic, Molecular & Chemical; Spectroscopy SC Astronomy & Astrophysics; Physics; Spectroscopy GA BZ94R UT WOS:A1993BZ94R00038 ER PT B AU HANNER, MS TOKUNAGA, AT GEBALLE, TR AF HANNER, MS TOKUNAGA, AT GEBALLE, TR BE Kwok, S TI THE 8-13 MICRON SPECTRUM OF THE YOUNG STELLAR OBJECT WL-16 SO ASTRONOMICAL INFRARED SPECTROSCOPY: FUTURE OBSERVATIONAL DIRECTIONS SE ASTRONOMICAL SOCIETY OF THE PACIFIC CONFERENCE SERIES LA English DT Meeting Abstract CT Conference on Astronomical Infrared Spectroscopy: Future Observational Directions CY JUN 16-19, 1992 CL UNIV CALGARY CAMPUS, CALGARY, CANADA HO UNIV CALGARY CAMPUS C1 JET PROP LAB,PASADENA,CA 91109. NR 0 TC 0 Z9 0 U1 0 U2 0 PU ASTRONOMICAL SOC PACIFIC PI SAN FRANCISCO PA 390 ASHTON AVE, SAN FRANCISCO, CA 94112 BN 0-937707-60-0 J9 ASTR SOC P PY 1993 VL 41 BP 217 EP 217 PG 1 WC Astronomy & Astrophysics; Physics, Atomic, Molecular & Chemical; Spectroscopy SC Astronomy & Astrophysics; Physics; Spectroscopy GA BZ94R UT WOS:A1993BZ94R00043 ER PT B AU BOHN, RB ALLAMANDOLA, LJ SANDFORD, SA AF BOHN, RB ALLAMANDOLA, LJ SANDFORD, SA BE Kwok, S TI HYDROGEN-ATOM ADDITION-REACTIONS IN INTERSTELLAR AND SOLAR-SYSTEM ICES SO ASTRONOMICAL INFRARED SPECTROSCOPY: FUTURE OBSERVATIONAL DIRECTIONS SE ASTRONOMICAL SOCIETY OF THE PACIFIC CONFERENCE SERIES LA English DT Proceedings Paper CT Conference on Astronomical Infrared Spectroscopy: Future Observational Directions CY JUN 16-19, 1992 CL UNIV CALGARY CAMPUS, CALGARY, CANADA HO UNIV CALGARY CAMPUS C1 NASA,AMES RES CTR,MOFFETT FIELD,CA 94035. NR 0 TC 1 Z9 1 U1 0 U2 0 PU ASTRONOMICAL SOC PACIFIC PI SAN FRANCISCO PA 390 ASHTON AVE, SAN FRANCISCO, CA 94112 BN 0-937707-60-0 J9 ASTR SOC P PY 1993 VL 41 BP 223 EP 224 PG 2 WC Astronomy & Astrophysics; Physics, Atomic, Molecular & Chemical; Spectroscopy SC Astronomy & Astrophysics; Physics; Spectroscopy GA BZ94R UT WOS:A1993BZ94R00046 ER PT B AU HUDGINS, DM SANDFORD, SA ALLAMANDOLA, LJ TIELENS, AGGM AF HUDGINS, DM SANDFORD, SA ALLAMANDOLA, LJ TIELENS, AGGM BE Kwok, S TI MIDINFRARED AND FAR-INFRARED SPECTROSCOPY OF ICES - OPTICAL-CONSTANTS AND INTEGRATED ABSORBANCES SO ASTRONOMICAL INFRARED SPECTROSCOPY: FUTURE OBSERVATIONAL DIRECTIONS SE ASTRONOMICAL SOCIETY OF THE PACIFIC CONFERENCE SERIES LA English DT Proceedings Paper CT Conference on Astronomical Infrared Spectroscopy: Future Observational Directions CY JUN 16-19, 1992 CL UNIV CALGARY CAMPUS, CALGARY, CANADA HO UNIV CALGARY CAMPUS C1 NASA,AMES RES CTR,MOFFETT FIELD,CA 94035. NR 0 TC 1 Z9 1 U1 0 U2 0 PU ASTRONOMICAL SOC PACIFIC PI SAN FRANCISCO PA 390 ASHTON AVE, SAN FRANCISCO, CA 94112 BN 0-937707-60-0 J9 ASTR SOC P PY 1993 VL 41 BP 271 EP 272 PG 2 WC Astronomy & Astrophysics; Physics, Atomic, Molecular & Chemical; Spectroscopy SC Astronomy & Astrophysics; Physics; Spectroscopy GA BZ94R UT WOS:A1993BZ94R00054 ER PT B AU HUDGINS, DM SANDFORD, SA ALLAMANDOLA, LJ AF HUDGINS, DM SANDFORD, SA ALLAMANDOLA, LJ BE Kwok, S TI MIDINFRARED AND FAR-INFRARED SPECTROSCOPY OF NAPHTHALENE (C10H8) AND D8-NAPHTHALENE (C10D8) SO ASTRONOMICAL INFRARED SPECTROSCOPY: FUTURE OBSERVATIONAL DIRECTIONS SE ASTRONOMICAL SOCIETY OF THE PACIFIC CONFERENCE SERIES LA English DT Proceedings Paper CT Conference on Astronomical Infrared Spectroscopy: Future Observational Directions CY JUN 16-19, 1992 CL UNIV CALGARY CAMPUS, CALGARY, CANADA HO UNIV CALGARY CAMPUS C1 NASA,AMES RES CTR,MOFFETT FIELD,CA 94035. NR 0 TC 1 Z9 1 U1 0 U2 0 PU ASTRONOMICAL SOC PACIFIC PI SAN FRANCISCO PA 390 ASHTON AVE, SAN FRANCISCO, CA 94112 BN 0-937707-60-0 J9 ASTR SOC P PY 1993 VL 41 BP 275 EP 276 PG 2 WC Astronomy & Astrophysics; Physics, Atomic, Molecular & Chemical; Spectroscopy SC Astronomy & Astrophysics; Physics; Spectroscopy GA BZ94R UT WOS:A1993BZ94R00056 ER PT B AU WITTEBORN, FC GREENE, T WOODEN, DH COHEN, M AF WITTEBORN, FC GREENE, T WOODEN, DH COHEN, M BE Kwok, S TI FUTURE AIRBORNE IR SPECTROMETERS - IMPROVED EFFICIENCY AND CALIBRATION SO ASTRONOMICAL INFRARED SPECTROSCOPY: FUTURE OBSERVATIONAL DIRECTIONS SE ASTRONOMICAL SOCIETY OF THE PACIFIC CONFERENCE SERIES LA English DT Proceedings Paper CT Conference on Astronomical Infrared Spectroscopy: Future Observational Directions CY JUN 16-19, 1992 CL UNIV CALGARY CAMPUS, CALGARY, CANADA HO UNIV CALGARY CAMPUS C1 NASA,AMES RES CTR,MOFFETT FIELD,CA 94035. NR 0 TC 0 Z9 0 U1 0 U2 1 PU ASTRONOMICAL SOC PACIFIC PI SAN FRANCISCO PA 390 ASHTON AVE, SAN FRANCISCO, CA 94112 BN 0-937707-60-0 J9 ASTR SOC P PY 1993 VL 41 BP 365 EP 372 PG 8 WC Astronomy & Astrophysics; Physics, Atomic, Molecular & Chemical; Spectroscopy SC Astronomy & Astrophysics; Physics; Spectroscopy GA BZ94R UT WOS:A1993BZ94R00074 ER PT J AU SMITH, EP KASSIM, NE AF SMITH, EP KASSIM, NE TI THE GALAXY ACTIVITY-INTERACTION CONNECTION .2. RADIO OBSERVATIONS SO ASTRONOMICAL JOURNAL LA English DT Article ID STAR FORMATION; CONTINUUM EMISSION; SPIRAL GALAXIES AB As the second part of an ongoing investigation into the triggering of nuclear radio emission in interacting galaxies, we present the results of a Very Large Array snapshot survey of southern interacting galaxies at 6 and 20 cm. The purpose of the survey was to search for and classify the nature of radio emission in a set of advanced-interaction disk galaxies which we had previously imaged optically. There were 42 interacting systems in our sample as well as 10 control systems, none of which had been previously detected by the Parkes surveys. Maps of the radio emission are presented and discussed. The radio properties of the galaxies are compared with their optical and infrared properties to determine the nature of the radio emission. We find that the radio emission in all our interacting galaxies can be attributed to processes associated with a burst of star formation caused by the galaxy interaction. In a specific case (0558-33), we quantitatively confirm earlier models of a starburst, but using radio observations to estimate the number of supernova remnants rather than optical spectra and broadband observations. In no case did we find clear evidence for a buried active nucleus. Further high resolution observations are needed however to better assess the contribution from any compact, weak active nuclei. Despite the obvious interaction these galaxies have undergone, none have developed into powerful radio sources, even though many of the most powerful radio sources are themselves the likely products of galaxy-galaxy interactions. We briefly discuss the implications for the triggering of nuclear activity. C1 USN,RES LAB,CTR ADV SPACE SENSING,WASHINGTON,DC 20375. RP SMITH, EP (reprint author), NASA,GODDARD SPACE FLIGHT CTR,GSFC,ASTRON SOLAR PHYS LAB,CODE 681,GREENBELT,MD 20771, USA. NR 26 TC 15 Z9 15 U1 0 U2 0 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0004-6256 J9 ASTRON J JI Astron. J. PD JAN PY 1993 VL 105 IS 1 BP 46 EP 52 DI 10.1086/116408 PG 7 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA KF509 UT WOS:A1993KF50900007 ER PT J AU LEIBUNDGUT, B KIRSHNER, RP PHILLIPS, MM WELLS, LA SUNTZEFF, NB HAMUY, M SCHOMMER, RA WALKER, AR GONZALEZ, L UGARTE, P WILLIAMS, RE WILLIGER, G GOMEZ, M MARZKE, R SCHMIDT, BP WHITNEY, B CALDWELL, N PETERS, J CHAFFEE, FH FOLTZ, CB REHNER, D SICILIANO, L BARNES, TG CHENG, KP HINTZEN, PMN KIM, YC MAZA, J PARKER, JW PORTER, AC SCHMIDTKE, PC SONNEBORN, G AF LEIBUNDGUT, B KIRSHNER, RP PHILLIPS, MM WELLS, LA SUNTZEFF, NB HAMUY, M SCHOMMER, RA WALKER, AR GONZALEZ, L UGARTE, P WILLIAMS, RE WILLIGER, G GOMEZ, M MARZKE, R SCHMIDT, BP WHITNEY, B CALDWELL, N PETERS, J CHAFFEE, FH FOLTZ, CB REHNER, D SICILIANO, L BARNES, TG CHENG, KP HINTZEN, PMN KIM, YC MAZA, J PARKER, JW PORTER, AC SCHMIDTKE, PC SONNEBORN, G TI SN-1991BG - A TYPE-IA SUPERNOVA WITH A DIFFERENCE SO ASTRONOMICAL JOURNAL LA English DT Article ID EARLY-TYPE GALAXIES; ABSOLUTE-MAGNITUDE DISTRIBUTIONS; WHITE-DWARF MODELS; ELLIPTICAL GALAXIES; STANDARD STARS; VIRGO CLUSTER; DUST; SPECTROSCOPY; HOMOGENEITY; PHOTOMETRY AB We present 13 spectra and 31 photometric observations covering the first 150 days of SN 1991bg in NGC 4374 (M 84). Although SN 1991bg was a type Ia supernova displaying the characteristic Si II absorption at 6150 angstrom near maximum and the Fe emission lines at late phases, it varied from the well-defined norm for SNe Ia in several important respects. The peculiarities include faster declines in the B and V light curves after maximum, a distinct color evolution, a very red B-V color near maximum, relatively faint peak luminosity, a distinct spectral evolution, and a short peak phase. The narrow peak of the luminosity and the rapid declines of the light curves suggest a smaller mass in the ejecta and larger energy losses than for most SNe Ia. The unusually red color at maximum is not a result of normal extinction, since SN 1991bg was as blue as other SNe Ia at late times and no narrow interstellar lines are observed in the spectra. The faint absolute magnitude of SN 1991bg is established beyond doubt by comparison with SN 1957B, another type Ia supernova in the same galaxy, which was approximately 2.5 magnitudes brighter than SN 1991bg. The spectral evolution reveals minor differences near maximum compared to other well-observed SNe Ia, mainly in relative line strengths. At later phases several wavelength regions display discrepancies when compared to spectra of normal SNe Ia. Although other SNe Ia, such as SN 1986G and SN 1939B, have light curves with fast decline rates, SN 1991bg is unique, with deviations in both light curves and spectra. In particular SN 1991bg is the only SN Ia observed to date with a distinct spectrum at approximately 40 days past maximum. Although SN 1991bg is an extreme case, with unusual photometric and spectroscopic properties, we believe it can be understood in the context of exploding white dwarf models, and is properly grouped with type Ia. SN 1991bg demonstrates the need for detailed observations of SNe Ia as part of their use as standard candles for cosmology. While there is a well-defined prototype with homogeneous properties, unusual cases like SN 1991bg must be identified and separated to avoid misleading results. C1 HARVARD SMITHSONIAN CTR ASTROPHYS,60 GARDEN ST,CAMBRIDGE,MA 02138. CERRO TOLOLO INTERAMER OBSERV,LA SERENA,CHILE. FL WHIPPLE OBSERV,AMADO,AZ 85645. MULTIPLE MIRROR TELESCOPE OBSERV,TUCSON,AZ 85721. SPACE TELESCOPE SCI INST,BALTIMORE,MD 21218. UNIV TEXAS,MCDONALD OBSERV,AUSTIN,TX 78712. NASA,GODDARD SPACE FLIGHT CTR,ASTRON & SOLAR PHYS LAB,GREENBELT,MD 20771. UNIV NEVADA,DEPT PHYS,LAS VEGAS,NV 89154. YALE UNIV,DEPT ASTRON,NEW HAVEN,CT 06511. UNIV CHILE,OBSERV ASTRON NACL,SANTIAGO,CHILE. UNIV COLORADO,CASA,APAS,BOULDER,CO 80309. ARIZONA STATE UNIV,DEPT PHYS & ASTRON,TEMPE,AZ 85287. RP LEIBUNDGUT, B (reprint author), NATL OPT ASTRON OBSERV,KITT PEAK NATL OBSERV,POB 26732,TUCSON,AZ 85726, USA. RI Hamuy, Mario/G-7541-2016 NR 91 TC 240 Z9 241 U1 1 U2 5 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 JAN PY 1993 VL 105 IS 1 BP 301 EP & DI 10.1086/116427 PG 0 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA KF509 UT WOS:A1993KF50900026 ER PT J AU KONTIZAS, E KONTIZAS, M MICHALITSIANOS, A AF KONTIZAS, E KONTIZAS, M MICHALITSIANOS, A TI INDICATIONS FOR COMMON ORIGIN AND GRAVITATIONAL INTERACTION IN 3 BINARY LMC CLUSTERS SO ASTRONOMY & ASTROPHYSICS LA English DT Article DE GALAXIES, MAGELLANIC CLOUDS; CLUSTERS, GLOBULAR ID OBSERVED DYNAMICAL PARAMETERS; LARGE MAGELLANIC CLOUD; SPECTRAL CLASSIFICATION; STAR-CLUSTERS; BRIGHT STARS; GLOBULAR-CLUSTERS; DISK CLUSTERS; SMC AB Three close pair clusters of the LMC, NGC 2006/SL 538, NGC 2011a/b and NGC 2042a/b, have been studied in order to establish their binarity. The stellar content in the outer region of each cluster has been investigated by means of low resolution objective UK Schmidt prism spectra, the cores of the clusters have been examined using low resolution integrated IUE spectra, whereas their density profiles and their observed dynamical parameters have been derived by means of star counts. The integrated spectra of their cores and the stellar content of their outer cluster regions have shown a common origin and a very young age (< 2 10(7)yr) for each member of the pairs whereas their dynamical study has shown that they are gravitationally interacting. Comparing the age of their stellar content with their dynamical and relaxation times it has been found that these clusters are physically associated and had no time to relax by stellar encounters, no time to merge and no time to be destroyed by dynamical friction. C1 UNIV ATHENS, DEPT PHYS, ASTROPHYS ASTRON & MECH SECT, GR-15783 ATHENS, GREECE. NASA, GODDARD SPACE FLIGHT CTR, ASTRON & SOLAR PHYS LAB, GREENBELT, MD 20771 USA. RP KONTIZAS, E (reprint author), NATL OBSERV, INST ASTRON, POB 20048, GR-11810 ATHENS, GREECE. RI Kontizas, Evangelos/A-1969-2014 NR 25 TC 13 Z9 13 U1 0 U2 0 PU EDP SCIENCES S A PI LES ULIS CEDEX A PA 17, AVE DU HOGGAR, PA COURTABOEUF, BP 112, F-91944 LES ULIS CEDEX A, FRANCE SN 0004-6361 J9 ASTRON ASTROPHYS JI Astron. Astrophys. PD JAN PY 1993 VL 267 IS 1 BP 59 EP 65 PG 7 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA KD756 UT WOS:A1993KD75600018 ER PT J AU DELEUIL, M GRY, C LAGRANGEHENRI, AM VIDALMADJAR, A BEUST, H FERLET, R MOOS, HW LIVENGOOD, TA ZISKIN, D FELDMAN, PD MCGRATH, MA AF DELEUIL, M GRY, C LAGRANGEHENRI, AM VIDALMADJAR, A BEUST, H FERLET, R MOOS, HW LIVENGOOD, TA ZISKIN, D FELDMAN, PD MCGRATH, MA TI THE BETA-PICTORIS CIRCUMSTELLAR DISK .15. HIGHLY IONIZED SPECIES NEAR BETA-PICTORIS SO ASTRONOMY & ASTROPHYSICS LA English DT Article DE STARS, BETA-PIC; STARS, CIRCUMSTELLAR MATTER; COMETS ID PROTO-PLANETARY SYSTEM; CA-II; BODIES; SHELL; STAR; GAS AB Temporal variations of the Fe II, Mg II and Al III circumstellar lines towards beta Pictoris have been detected and monitored since 1985. However, the unusual presence of Al III ions is still puzzling, since the UV stellar flux from an A5V star such as beta Pic is insufficient to produce such an ion. In order to better define the origin of such a phenomenon, new observations have been carried out to detect faint signatures of other highly ionized species in the short UV wavelength range, where the stellar continuum flux is low. These observations reveal variations not only near the C IV doublet lines, but also in C I and Al II lines, two weakly ionized species, not clearly detectable until now. In the framework of an infalling body scenario, highly ionized species would be created in the tail, far from the comet head, by collisions with ambient gas surrounding the star, or a weak stellar wind. Spectral changes have also been detected near a CO molecular band location, which, if confirmed, would provide the first molecular signature around beta Pictoris. C1 CERMO, GRP ASTROPHYS GRENOBLE, F-38041 GRENOBLE, FRANCE. CEA, CTR ETUDES SACLAY, DAPNIA, SERV ASTROPHYS, F-91191 GIF SUR YVETTE, FRANCE. JOHNS HOPKINS UNIV, DEPT PHYS & ASTRON, BALTIMORE, MD 21218 USA. NASA, GODDARD SPACE FLIGHT CTR, GREENBELT, MD 20771 USA. INST ASTROPHYS, F-75014 PARIS, FRANCE. RP DELEUIL, M (reprint author), CNRS, ASTRON SPATIALE LAB, BP 8, F-13376 MARSEILLE 12, FRANCE. RI Livengood, Timothy/C-8512-2012 NR 16 TC 26 Z9 26 U1 0 U2 0 PU EDP SCIENCES S A PI LES ULIS CEDEX A PA 17, AVE DU HOGGAR, PA COURTABOEUF, BP 112, F-91944 LES ULIS CEDEX A, FRANCE SN 0004-6361 J9 ASTRON ASTROPHYS JI Astron. Astrophys. PD JAN PY 1993 VL 267 IS 1 BP 187 EP 193 PG 7 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA KD756 UT WOS:A1993KD75600035 ER PT J AU GEHRELS, N CHIPMAN, E KNIFFEN, DA AF GEHRELS, N CHIPMAN, E KNIFFEN, DA TI THE COMPTON GAMMA-RAY OBSERVATORY SO ASTRONOMY & ASTROPHYSICS SUPPLEMENT SERIES LA English DT Article; Proceedings Paper CT INTERNATIONAL SYMP ON RECENT ADVANCES IN HIGH ENERGY ASTRONOMY CY MAR 17-20, 1992 CL TOULOUSE, FRANCE SP CTR NATL ETUDES SPATIALES, CNRS, CONSEIL REG MIDI PYRENEES, CEA, UNIV PAUL SABATIER TOULOUSE, CTR ETUDE SPATIALE RAYONNEMENTS DE GAMMA-RAYS, BURSTS; GAMMA-RAYS, GENERAL; SPACE VEHICLES AB The Arthur Holly Compton Gamma Ray Observatory (Compton) was launched by the Space Shuttle Atlantis on 5 April 1991. The spacecraft and instruments are in good health and returning exciting results. The mission provides nearly six orders of magnitude in spectral coverage, from 30 keV to 30 GeV, with sensitivity over the entire range an order of magnitude better than that of previous observations. The 16,000 kilogram observatory contains four instruments on a stabilized platform. The mission began normal operations on 16 May 1991 and is now over half-way through a full-sky survey. The mission duration is expected to be from six to ten years. A Science Support Center has been established at Goddard Space Flight Center for the purpose of supporting a vigorous Guest Investigator Program. New scientific results to date include: (1) the establishment of the isotropy, combined with spatial inhomogeneity, of the distribution of gamma-ray bursts in the sky; (2) the discovery of intense high energy (100 MeV) gamma-ray emission from 3C 279 and other quasars and BL Lac objects, making these the most distant and luminous gamma-ray sources ever detected; (3) one of the first images of a gamma-ray burst; (4) the observation of intense nuclear and positron-annihilation gamma-ray lines and neutrons from several large solar flares; and (5) the detection of a third gamma-ray pulsar, plus several other transient and pulsing hard x-ray sources. C1 COMP SCI CORP,ASTRON PROGRAMS,GREENBELT,MD 20771. HAMPDEN SYDNEY COLL,HAMPDEN SYDNEY,VA 23943. RP GEHRELS, N (reprint author), NASA,GODDARD SPACE FLIGHT CTR,CODE 661,GREENBELT,MD 20771, USA. NR 17 TC 21 Z9 21 U1 0 U2 1 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 0365-0138 J9 ASTRON ASTROPHYS SUP JI Astron. Astrophys. Suppl. Ser. PD JAN PY 1993 VL 97 IS 1 BP 5 EP 12 PG 8 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA KJ736 UT WOS:A1993KJ73600003 ER PT J AU FICHTEL, CE BERTSCH, DL HARTMAN, RC HUNTER, SD KANBACH, G KNIFFEN, DA KWOK, PW LIN, YC MATTOX, JR MAYERHASSELWANDER, HA MICHELSON, PF VONMONTIGNY, C NOLAN, PL PINKAU, K ROTHERMEL, H SCHNEID, EJ SOMMER, M SREEKUMAR, P THOMPSON, DJ AF FICHTEL, CE BERTSCH, DL HARTMAN, RC HUNTER, SD KANBACH, G KNIFFEN, DA KWOK, PW LIN, YC MATTOX, JR MAYERHASSELWANDER, HA MICHELSON, PF VONMONTIGNY, C NOLAN, PL PINKAU, K ROTHERMEL, H SCHNEID, EJ SOMMER, M SREEKUMAR, P THOMPSON, DJ TI OVERVIEW OF THE 1ST RESULTS FROM EGRET SO ASTRONOMY & ASTROPHYSICS SUPPLEMENT SERIES LA English DT Article; Proceedings Paper CT INTERNATIONAL SYMP ON RECENT ADVANCES IN HIGH ENERGY ASTRONOMY CY MAR 17-20, 1992 CL TOULOUSE, FRANCE SP CTR NATL ETUDES SPATIALES, CNRS, CONSEIL REG MIDI PYRENEES, CEA, UNIV PAUL SABATIER TOULOUSE, CTR ETUDE SPATIALE RAYONNEMENTS DE GAMMA-RAYS; SUN; PULSARS; BURSTS; INTERSTELLAR MEDIUM; ACTIVE GALACTIC NUCLEI ID RAPIDLY SPINNING PULSARS; GAMMA-RAY OBSERVATIONS; ENERGETIC RADIATION; VELA PULSAR AB The Energetic Gamma Ray Experiment Telescope (EGRET), one of four instruments carried on the Compton Gamma Ray Observatory, is capable of detecting photons in the energy range from approximately 20 MeV to 30 GeV. After a period of about one month for test and calibration, a 15-month all sky survey was begun. The June 11, 1992 solar flare was observed in gamma rays with energies from the threshold of detection to energies over 1 GeV. Detailed time histories and energy spectra have been obtained for the Crab and Vela pulsars, with one of the Vela pulses being quite sharp, approximately 2% of the total period. Several gamma ray bursts have been recorded. In particular, the one on May 3, 1991 was seen in the spark chamber system of EGRET, allowing a position to be determined. The galactic plane diffuse gamma ray emission has been observed in many regions of the plane, and the galactic center region spectrum has been compared to that expected for cosmic rays interacting with matter and photons and found to agree well. The quasar 3C 279, which has a z of 0.538, was seen in high energy gamma rays in both June and October, 1992. It is time variable on times as short as 2 days, and has a hard energy spectrum. The quasars 3C 273, PKS 0208-512, 4C 38.41, PKS 0528+134, and 0836+710 also have been tentatively identified. 4C 38.41, with a z of 1.8, has a hard gamma ray energy spectrum. C1 MAX PLANCK INST EXTRATERR PHYS,W-8046 GARCHING,GERMANY. HAMPDEN SYDNEY COLL,HAMPDEN SYDNEY,VA 23943. STANFORD UNIV,HANSEN EXPTL PHYS LAB,STANFORD,CA 94305. NASA,GODDARD SPACE FLIGHT CTR,COMP SCI CORP,COMPTON OBSERV,CTR SCI SUPPORT,GREENBELT,MD 20771. MAX PLANCK INST PLASMA PHYS,W-8046 GARCHING,GERMANY. GRUMMAN AEROSP CORP,BETHPAGE,NY 11714. NASA,GODDARD SPACE FLIGHT CTR,UNIV SPACE RES ASSOCIATES,GREENBELT,MD 20771. RP FICHTEL, CE (reprint author), NASA,GODDARD SPACE FLIGHT CTR,CODE 662,GREENBELT,MD 20771, USA. RI Hunter, Stanley/D-2942-2012; Thompson, David/D-2939-2012; Nolan, Patrick/A-5582-2009 OI Thompson, David/0000-0001-5217-9135; NR 27 TC 28 Z9 28 U1 0 U2 0 PU EDITIONS PHYSIQUE PI LES ULIS CEDEX PA Z I DE COURTABOEUF AVE 7 AV DU HOGGAR, BP 112, 91944 LES ULIS CEDEX, FRANCE SN 0365-0138 J9 ASTRON ASTROPHYS SUP JI Astron. Astrophys. Suppl. Ser. PD JAN PY 1993 VL 97 IS 1 BP 13 EP 16 PG 4 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA KJ736 UT WOS:A1993KJ73600004 ER PT J AU FISHMAN, GJ MEEGAN, CA WILSON, RB PACIESAS, WS PENDLETON, GN HARMON, BA HORACK, JM BROCK, MN KOUVELIOTOU, C FINGER, M AF FISHMAN, GJ MEEGAN, CA WILSON, RB PACIESAS, WS PENDLETON, GN HARMON, BA HORACK, JM BROCK, MN KOUVELIOTOU, C FINGER, M TI OVERVIEW OF OBSERVATIONS FROM BATSE ON THE COMPTON-OBSERVATORY SO ASTRONOMY & ASTROPHYSICS SUPPLEMENT SERIES LA English DT Article; Proceedings Paper CT INTERNATIONAL SYMP ON RECENT ADVANCES IN HIGH ENERGY ASTRONOMY CY MAR 17-20, 1992 CL TOULOUSE, FRANCE SP CTR NATL ETUDES SPATIALES, CNRS, CONSEIL REG MIDI PYRENEES, CEA, UNIV PAUL SABATIER TOULOUSE, CTR ETUDE SPATIALE RAYONNEMENTS DE GAMMA-RAYS, BURSTS, OBSERVATIONS; X-RAYS, GENERAL AB The BATSE experiment on the Compton Gamma Ray Observatory is providing new data on the distribution of gamma-ray bursts. The initial set of observations of over 260 gamma-ray bursts detected in the first ten months of operation shows an isotropic distribution on the sky coupled with an intensity distribution that indicates a spatial confinement. The large area detectors also monitor a large fraction of the sky to monitor variations of known hard X-ray sources and search for transients. Pulsing sources are routinely observed both by temporal analysis on the ground and by on-board folding of data. Examples of observations from the first year of BATSE operations are shown. C1 UNIV ALABAMA,DEPT PHYS,HUNTSVILLE,AL 35899. UNIV SPACE RES ASSOC,WASHINGTON,DC. COMPTON OBSERV,CTR SCI SUPPORT,GREENBELT,MD. RP FISHMAN, GJ (reprint author), NASA,GEORGE C MARSHALL SPACE FLIGHT CTR,CODE ES62,HUNTSVILLE,AL 35812, USA. RI Horack, John/J-6670-2016 NR 19 TC 27 Z9 27 U1 0 U2 0 PU EDITIONS PHYSIQUE PI LES ULIS CEDEX PA Z I DE COURTABOEUF AVE 7 AV DU HOGGAR, BP 112, 91944 LES ULIS CEDEX, FRANCE SN 0365-0138 J9 ASTRON ASTROPHYS SUP JI Astron. Astrophys. Suppl. Ser. PD JAN PY 1993 VL 97 IS 1 BP 17 EP 20 PG 4 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA KJ736 UT WOS:A1993KJ73600005 ER PT J AU HURLEY, K SOMMER, M BOER, M NIEL, M LAROS, J FENIMORE, E KLEBESADEL, R FISHMAN, G KOUVELIOTOU, C MEEGAN, C PACIESAS, W WILSON, R CLINE, T AF HURLEY, K SOMMER, M BOER, M NIEL, M LAROS, J FENIMORE, E KLEBESADEL, R FISHMAN, G KOUVELIOTOU, C MEEGAN, C PACIESAS, W WILSON, R CLINE, T TI ULYSSES PRECISE LOCALIZATIONS OF GAMMA-RAY BURSTS SO ASTRONOMY & ASTROPHYSICS SUPPLEMENT SERIES LA English DT Article; Proceedings Paper CT INTERNATIONAL SYMP ON RECENT ADVANCES IN HIGH ENERGY ASTRONOMY CY MAR 17-20, 1992 CL TOULOUSE, FRANCE SP CTR NATL ETUDES SPATIALES, CNRS, CONSEIL REG MIDI PYRENEES, CEA, UNIV PAUL SABATIER TOULOUSE, CTR ETUDE SPATIALE RAYONNEMENTS DE WORDS, GAMMA-RAYS (BURSTS); SPACE INSTRUMENTATION AB The Ulysses mission is presently about 5 AU from Earth, in the vicinity of Jupiter. It carries a gamma-ray burst detector sensitive to almost-equal-to 15 - 150 keV X-rays, with time resolution down to 8 ms. for the purpose of high accuracy burst localization by the time-of-arrival method. This spacecraft, which is farther from Earth than any previous mission with a burst detector, operates in conjunction with other missions in the 3rd Interplanetary Network, such as Pioneer Venus Orbiter (PVO) and Compton GRO (CGRO). The Network has detected about 40 bursts since the launch of CGRO, and is localizing them with high accuracy. We present the current event list and discuss the error boxes of two recently observed weak gamma-bursts. C1 LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87545. NASA,GEORGE C MARSHALL SPACE FLIGHT CTR,HUNTSVILLE,AL 35812. NASA,GODDARD SPACE FLIGHT CTR,GREENBELT,MD 20771. MAX PLANCK INST EXTRATERR PHYS,W-8046 GARCHING,GERMANY. CTR ETUD SPATIALE RAYONNEMENTS,F-31029 TOULOUSE,FRANCE. RP HURLEY, K (reprint author), UNIV CALIF BERKELEY,SPACE SCI LAB,BERKELEY,CA 94720, USA. NR 5 TC 10 Z9 10 U1 0 U2 0 PU EDITIONS PHYSIQUE PI LES ULIS CEDEX PA Z I DE COURTABOEUF AVE 7 AV DU HOGGAR, BP 112, 91944 LES ULIS CEDEX, FRANCE SN 0365-0138 J9 ASTRON ASTROPHYS SUP JI Astron. Astrophys. Suppl. Ser. PD JAN PY 1993 VL 97 IS 1 BP 39 EP 41 PG 3 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA KJ736 UT WOS:A1993KJ73600010 ER PT J AU KOUVELIOTOU, C PACIESAS, WS FISHMAN, GJ MEEGAN, CA WILSON, RB AF KOUVELIOTOU, C PACIESAS, WS FISHMAN, GJ MEEGAN, CA WILSON, RB TI GAMMA-RAY BURST COLOR-COLOR DIAGRAMS SO ASTRONOMY & ASTROPHYSICS SUPPLEMENT SERIES LA English DT Article; Proceedings Paper CT INTERNATIONAL SYMP ON RECENT ADVANCES IN HIGH ENERGY ASTRONOMY CY MAR 17-20, 1992 CL TOULOUSE, FRANCE SP CTR NATL ETUDES SPATIALES, CNRS, CONSEIL REG MIDI PYRENEES, CEA, UNIV PAUL SABATIER TOULOUSE, CTR ETUDE SPATIALE RAYONNEMENTS DE GAMMA-RAYS, BURSTS AB We calculate the spectral hardness ratios for several intense gamma ray bursts (GRBs) which have sufficient statistics in four energy channels. We study the evolution of these hardness ratios during the events using color-color diagrams (CCDs) and we attempt a preliminary classification of GRBs based on their CCD evolution. C1 UNIV ALABAMA,DEPT PHYS,HUNTSVILLE,AL 35899. NASA,GEORGE C MARSHALL SPACE FLIGHT CTR,SPACE SCI LAB ES-62,HUNTSVILLE,AL 35812. RP KOUVELIOTOU, C (reprint author), NASA,GEORGE C MARSHALL SPACE FLIGHT CTR,UNIV SPACE RES ASSOC,HUNTSVILLE,AL 35812, USA. NR 8 TC 6 Z9 6 U1 0 U2 0 PU EDITIONS PHYSIQUE PI LES ULIS CEDEX PA Z I DE COURTABOEUF AVE 7 AV DU HOGGAR, BP 112, 91944 LES ULIS CEDEX, FRANCE SN 0365-0138 J9 ASTRON ASTROPHYS SUP JI Astron. Astrophys. Suppl. Ser. PD JAN PY 1993 VL 97 IS 1 BP 55 EP 57 PG 3 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA KJ736 UT WOS:A1993KJ73600013 ER PT J AU VONMONTIGNY, C BERTSCH, DL FICHTEL, CE HARTMAN, RC HUNTER, SD KANBACH, G KNIFFEN, DA KWOK, PW LIN, YC MATTOX, JR MAYERHASSELWANDER, HA MICHELSON, PF NOLAN, PL PINKAU, K ROTHERMEL, H SCHNEID, E SOMMER, M SREEKUMAR, P THOMPSON, DJ AF VONMONTIGNY, C BERTSCH, DL FICHTEL, CE HARTMAN, RC HUNTER, SD KANBACH, G KNIFFEN, DA KWOK, PW LIN, YC MATTOX, JR MAYERHASSELWANDER, HA MICHELSON, PF NOLAN, PL PINKAU, K ROTHERMEL, H SCHNEID, E SOMMER, M SREEKUMAR, P THOMPSON, DJ TI EGRET OBSERVATIONS OF 3C-273 SO ASTRONOMY & ASTROPHYSICS SUPPLEMENT SERIES LA English DT Article; Proceedings Paper CT INTERNATIONAL SYMP ON RECENT ADVANCES IN HIGH ENERGY ASTRONOMY CY MAR 17-20, 1992 CL TOULOUSE, FRANCE SP CTR NATL ETUDES SPATIALES, CNRS, CONSEIL REG MIDI PYRENEES, CEA, UNIV PAUL SABATIER TOULOUSE, CTR ETUDE SPATIALE RAYONNEMENTS DE GAMMA-RAYS; QUASARS, 3C 273; INSTRUMENT, EGRET ID COS-B; TELESCOPE; EMISSION; 3C273 AB The quasar 3C 273 was detected by COS-B in the 1970's. EGRET observations of this sky region in June and October 1991 revealed a flux from 3C 273 lower than that measured by COS-B. The flux observed by EGRET in the June period is approximately 3 x 10(-7) cm-2 sec-1 for energies greater than 100 MeV. During the October observation it appears to be even lower. For the first observation a preliminary spectrum has been derived which has a photon index of 2.4. C1 NASA,GODDARD SPACE FLIGHT CTR,GREENBELT,MD 20771. STANFORD UNIV,STANFORD,CA 94305. HAMPDEN SYDNEY COLL,HAMPDEN SYDNEY,VA 23943. GRUMMAN AEROSP CORP,BETHPAGE,NY 11714. NASA,GODDARD SPACE FLIGHT CTR,COMP SCI CORP,GREENBELT,MD 20771. NASA,GODDARD SPACE FLIGHT CTR,UNIV SPACE RES ASSOC,GREENBELT,MD 20771. RP VONMONTIGNY, C (reprint author), MAX PLANCK INST EXTRATERR PHYS,W-8046 GARCHING,GERMANY. RI Hunter, Stanley/D-2942-2012; Thompson, David/D-2939-2012; Nolan, Patrick/A-5582-2009 OI Thompson, David/0000-0001-5217-9135; NR 8 TC 38 Z9 38 U1 0 U2 0 PU EDITIONS PHYSIQUE PI LES ULIS CEDEX PA Z I DE COURTABOEUF AVE 7 AV DU HOGGAR, BP 112, 91944 LES ULIS CEDEX, FRANCE SN 0365-0138 J9 ASTRON ASTROPHYS SUP JI Astron. Astrophys. Suppl. Ser. PD JAN PY 1993 VL 97 IS 1 BP 101 EP 103 PG 3 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA KJ736 UT WOS:A1993KJ73600026 ER PT J AU RAMATY, R LINGENFELTER, RE AF RAMATY, R LINGENFELTER, RE TI DIFFUSE GALACTIC ANNIHILATION RADIATION SO ASTRONOMY & ASTROPHYSICS SUPPLEMENT SERIES LA English DT Article DE GAMMA-RAYS, OBSERVATIONS; GAMMA-RAY, THEORY; GALAXY, CENTER; GALAXY, STELLAR CONTENT; NOVAE ID POSITRON-ANNIHILATION; CENTER DIRECTION; CENTER REGION; MOLECULAR CLOUD; IRON LINE; 1E1740.7-2942; CONTINUUM AB Observations of positron annihilation radiation from the inner region of the Galaxy show that there are two components of the radiation: a steady, diffuse Galactic component and a variable component from discrete, presumably compact sources. The existence of the variable component is supported by the ensemble of all narrow field of view (FWHM < 20-degrees) 511 keV line observations including recent detections with OSSE. The fit of this ensemble to a time independent source distribution can be excluded at the approximately 3sigma level. The same ensemble, combined with the broad field of view SMM observations of Galactic 511 keV line emission, sets constraints on the Galactic distribution of the diffuse component. The best fit to all of the data is achieved by using the distribution of Galactic novae, which should be very similar to that of Type Ia supernovae. This nova distribution yields a central radian flux of (17 +/- 3) x 10(-4) photons cm-2 s-1 and a total Galactic positron annihilation rate of (1.6(-0.4)+0.5) x 10(43) positrons s-1. The dominant source of the positrons is beta+-decay of Co-56-->Fe-56 and Sc-44-->Ca-44 produced by thermonuclear burning in supernovae. The contribution of Al-26 decay is approximately 13% of the total. The observations and analysis imply a current Galactic rate of Fe-56 nucleosynthesis of approximately (0.8 +/- 0.5) M. per 100 years. C1 UNIV CALIF SAN DIEGO, CTR ASTROPHYS & SPACE SCI, LA JOLLA, CA 92093 USA. RP RAMATY, R (reprint author), NASA, GODDARD SPACE FLIGHT CTR, HIGH ENERGY PHYS LAB, GREENBELT, MD 20771 USA. NR 38 TC 2 Z9 2 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 0365-0138 J9 ASTRON ASTROPHYS SUP JI Astron. Astrophys. Suppl. Ser. PD JAN PY 1993 VL 97 IS 1 BP 127 EP 131 PG 5 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA KJ736 UT WOS:A1993KJ73600032 ER PT J AU SKIBO, JG RAMATY, R AF SKIBO, JG RAMATY, R TI DIFFUSE GALACTIC LOW-ENERGY GAMMA-RAY CONTINUUM EMISSION SO ASTRONOMY & ASTROPHYSICS SUPPLEMENT SERIES LA English DT Article DE COSMIC RAYS; GAMMA RAYS; INTERSTELLAR MEDIUM ID IRON LINE; RADIATION; BREMSSTRAHLUNG; ELECTRONS; SPECTRUM; REGION; GALAXY; FIELD; DISK AB We investigate the origin of diffuse low energy Galactic gamma ray continuum down to about 30 keV. We calculate gamma ray emission via bremsstrahlung and inverse Compton scattering by propagating an unbroken electron power law injection spectrum and employing a Galactic emissivity model derived from COSB observations. To maintain the low energy electron population capable of producing the observed continuum via bremsstrahlung, a total power input of 4 x 10(41) erg s-1 is required. This exceeds the total power supplied to the nuclear cosmic rays by about an order of magnitude. RP SKIBO, JG (reprint author), NASA, GODDARD SPACE FLIGHT CTR, HIGH ENERGY ASTROPHYS LAB, CODE 665, GREENBELT, MD 20771 USA. NR 33 TC 37 Z9 37 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 0365-0138 J9 ASTRON ASTROPHYS SUP JI Astron. Astrophys. Suppl. Ser. PD JAN PY 1993 VL 97 IS 1 BP 145 EP 148 PG 4 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA KJ736 UT WOS:A1993KJ73600037 ER PT J AU MAHONEY, WA LING, JC WHEATON, WA AF MAHONEY, WA LING, JC WHEATON, WA TI HIGH-RESOLUTION SPECTRUM OF THE GALACTIC-CENTER SO ASTRONOMY & ASTROPHYSICS SUPPLEMENT SERIES LA English DT Article DE GAMMA-RAYS, OBSERVATIONS; GALAXY, CENTER ID POSITRON-ANNIHILATION RADIATION; GAMMA-RAY SPECTROMETER; CENTER REGION; CENTER DIRECTION; GALAXIES; EMISSION; SEARCH AB Recent observations of the Galactic center region indicate the presence of a narrow gamma-ray line feature at 170 keV, and theoretical spectulations suggest it may result from Compton backscattering of the 511 keV annihilation radiation. The high-resolution gamma-ray spectrometer on HEAO 3 observed the Galactic center in the fall of 1979 and in the spring of 1980. In view of the recent developments, the HEAO data were re-examined to search for this new feature and to look for possible correlations with the 511 keV line emission. No evidence for such Compton backscattered radiation was found and the derived upper limits for emission in a line feature near 170 keV were well below previously reported fluxes, indicating possible time variability. RP MAHONEY, WA (reprint author), CALTECH, JET PROP LAB 169-327, 4800 OAK GROVE DR, PASADENA, CA 91109 USA. NR 24 TC 3 Z9 3 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 0365-0138 J9 ASTRON ASTROPHYS SUP JI Astron. Astrophys. Suppl. Ser. PD JAN PY 1993 VL 97 IS 1 BP 159 EP 163 PG 5 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA KJ736 UT WOS:A1993KJ73600040 ER PT J AU PACIESAS, WS HARMON, BA PENDLETON, GN FINGER, MH FISHMAN, GJ MEEGAN, CA RUBIN, BC WILSON, RB AF PACIESAS, WS HARMON, BA PENDLETON, GN FINGER, MH FISHMAN, GJ MEEGAN, CA RUBIN, BC WILSON, RB TI STUDIES OF HARD X-RAY SOURCE VARIABILITY USING BATSE SO ASTRONOMY & ASTROPHYSICS SUPPLEMENT SERIES LA English DT Article DE X-RAYS, GENERAL; GAMMA-RAYS, OBSERVATIONS; METHODS, DATA ANALYSIS AB The BATSE large-area detectors on the Compton Observatory can be used to monitor the variability of x-ray and gamma-ray sources on timescales longer than a few hours using the Earth occultation technique. Spectral information is collected in 16 channels covering the energy range from approximately 25 to 2000 keV. Approximately 20 of the strongest sources are currently being monitored on a daily basis as part of standard BATSE operations. We discuss observations of the Crab Nebula, Cen A, and the Galactic Center as examples of the current BATSE capabilities. C1 COMPTON OBSERV, CTR SCI SUPPORT, GREENBELT, MD USA. NASA, GEORGE C MARSHALL SPACE FLIGHT CTR, SPACE SCI LAB, HUNTSVILLE, AL 35812 USA. UNIV SPACE RES ASSOC, WASHINGTON, DC USA. RP PACIESAS, WS (reprint author), UNIV ALABAMA, DEPT PHYS, HUNTSVILLE, AL 35899 USA. NR 10 TC 7 Z9 7 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 0365-0138 J9 ASTRON ASTROPHYS SUP JI Astron. Astrophys. Suppl. Ser. PD JAN PY 1993 VL 97 IS 1 BP 253 EP 255 PG 3 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA KJ736 UT WOS:A1993KJ73600062 ER PT J AU SHRADER, CR GONZALEZRIESTRA, R CHENG, FH HORNE, K PANAGIA, N GILMOZZI, R LUND, N AF SHRADER, CR GONZALEZRIESTRA, R CHENG, FH HORNE, K PANAGIA, N GILMOZZI, R LUND, N TI ULTRAVIOLET SPECTROSCOPY OF NOVA-MUSCAE 1991 SO ASTRONOMY & ASTROPHYSICS SUPPLEMENT SERIES LA English DT Article; Proceedings Paper CT INTERNATIONAL SYMP ON RECENT ADVANCES IN HIGH ENERGY ASTRONOMY CY MAR 17-20, 1992 CL TOULOUSE, FRANCE SP CTR NATL ETUDES SPATIALES, CNRS, CONSEIL REG MIDI PYRENEES, CEA, UNIV PAUL SABATIER TOULOUSE, CTR ETUDE SPATIALE RAYONNEMENTS DE STARS-INDIVIDUAL, NOVA-MUSCAE 1991; ULTRAVIOLET, STARS; X-RAY, STARS AB We report on a series of ultraviolet spectroscopic observations made with the IUE satellite, which sampled critical outburst stages of the soft X-ray transient Nova Muscae 1991. Continuum light curves, and multi-epoch line analysis are presented. In addition, a single-epoch optical-UV spectra obtained with the HST/FOS is discussed. The optical-UV continuum fits approximately the ''canonical'' f(v) is-proportional-to v1/3 power law expected for thermal emission from steady state accretion disk. The emission line spectrum contains prominent high ionization lines of C IV (lambda1549) and N V (lambda1240). Weaker lines are seen at intermittent epochs, including some of lower ionization. Derivation of galactic reddening which has significant implications for distance estimates is discussed. Comparisons with previous SXT sources are considered. C1 NASA,IUE OBSERV,WASHINGTON,DC 20546. VILSPA,ESA,IUE OBSERV,E-28080 MADRID,SPAIN. SPACE TELESCOPE SCI INST,BALTIMORE,MD 21218. DANISH SPACE RES INST,DK-2800 LYNGBY,DENMARK. RP SHRADER, CR (reprint author), NASA,GODDARD SPACE FLIGHT CTR,COMP SCI CORP,ASTRON PROGRAM,CODE 6681,GREENBELT,MD 20771, USA. NR 7 TC 5 Z9 5 U1 0 U2 0 PU EDITIONS PHYSIQUE PI LES ULIS CEDEX PA Z I DE COURTABOEUF AVE 7 AV DU HOGGAR, BP 112, 91944 LES ULIS CEDEX, FRANCE SN 0365-0138 J9 ASTRON ASTROPHYS SUP JI Astron. Astrophys. Suppl. Ser. PD JAN PY 1993 VL 97 IS 1 BP 309 EP 311 PG 3 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA KJ736 UT WOS:A1993KJ73600074 ER PT J AU KANBACH, G BERTSCH, DL FICHTEL, CE HARTMAN, RC HUNTER, SD KNIFFEN, DA KWOK, PW LIN, YC MATTOX, JR MAYERHASSELWANDER, HA MICHELSON, PF VONMONTIGNY, C NOLAN, PL PINKAU, K ROTHERMEL, H SCHNEID, E SOMMER, M SREEKUMAR, P THOMPSON, DJ AF KANBACH, G BERTSCH, DL FICHTEL, CE HARTMAN, RC HUNTER, SD KNIFFEN, DA KWOK, PW LIN, YC MATTOX, JR MAYERHASSELWANDER, HA MICHELSON, PF VONMONTIGNY, C NOLAN, PL PINKAU, K ROTHERMEL, H SCHNEID, E SOMMER, M SREEKUMAR, P THOMPSON, DJ TI DETECTION OF A LONG-DURATION SOLAR GAMMA-RAY FLARE ON JUNE 11, 1991 WITH EGRET ON COMPTON - GRO SO ASTRONOMY & ASTROPHYSICS SUPPLEMENT SERIES LA English DT Article DE GAMMA RAYS; SOLAR FLARES ID TELESCOPE; ACCELERATION; TRANSPORT; PARTICLES AB On June 11, 1991, the Energetic Gamma Ray Experiment Telescope (EGRET) on the Compton Gamma Ray Observatory (COMPTON) observed high-energy gamma radiation above 30 MeV from the sun following an intense flare around 2:00 UT. After the decay of most of the X-ray flare, which caused nearly complete deadtime losses in EGRET, high-energy emission was registered during the interval from about 3:30 UT to at least 10:30 UT. Gamma rays were detected up to energies above 1 GeV. The solar origin of this emission is assured by the time profile of the gamma-ray count rate and by time resolved sky maps, which show a clear maximum at the position of the sun. The gamma-ray lightcurve of the flare can be described with two-components: a fast decaying emission with an e-folding time constant of about 25 minutes and a slow decay with about 255 minutes. There are indications for a spectral evolution with time, such that the emission below 100 MeV fades away earlier than the 100-300 MeV radiation, roughly on the time scale of the fast component. The spectrum of the flare can be well fitted with a composite of a proton generated pi0 spectrum and an electron bremsstrahlung component. The latter can be identified with the fast decaying component of the lightcurve. C1 STANFORD UNIV, HANSEN EXPTL PHYS LAB, STANFORD, CA 94305 USA. NASA, GODDARD SPACE FLIGHT CTR, COMP SCI CORP, COMPTON SCI SUPPORT CTR, GREENBELT, MD 20771 USA. GRUMMAN AEROSP CORP, BETHPAGE, NY 11714 USA. HAMPDEN SYDNEY COLL, HAMPDEN SYDNEY, VA 23943 USA. NASA, GODDARD SPACE FLIGHT CTR, UNIV SPACE RES ASSOC, GREENBELT, MD 20771 USA. RP KANBACH, G (reprint author), MAX PLANCK INST EXTRATERR PHYS, W-8046 GARCHING, GERMANY. RI Hunter, Stanley/D-2942-2012; Thompson, David/D-2939-2012; Nolan, Patrick/A-5582-2009 OI Thompson, David/0000-0001-5217-9135; NR 21 TC 120 Z9 122 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 0365-0138 J9 ASTRON ASTROPHYS SUP JI Astron. Astrophys. Suppl. Ser. PD JAN PY 1993 VL 97 IS 1 BP 349 EP 353 PG 5 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA KJ736 UT WOS:A1993KJ73600085 ER PT J AU BRADT, HV ROTHSCHILD, RE SWANK, JH AF BRADT, HV ROTHSCHILD, RE SWANK, JH TI X-RAY TIMING EXPLORER MISSION SO ASTRONOMY & ASTROPHYSICS SUPPLEMENT SERIES LA English DT Article; Proceedings Paper CT INTERNATIONAL SYMP ON RECENT ADVANCES IN HIGH ENERGY ASTRONOMY CY MAR 17-20, 1992 CL TOULOUSE, FRANCE SP CTR NATL ETUDES SPATIALES, CNRS, CONSEIL REG MIDI PYRENEES, CEA, UNIV PAUL SABATIER TOULOUSE, CTR ETUDE SPATIALE RAYONNEMENTS DE INSTRUMENTS, X-RAY; OBSERVATORY, X-RAY; X-RAY ASTRONOMY AB The XTE will address a number of fundamental questions about the nature of the cosmos. The large effective area (approximately 0.8m2 total) and broad band of sensitivity (2-200 keV) of its three instruments make it especially valuable for timing of intensity variations and for the determination of broad-band spectra from high-energy sources. For the first time, studies of variability ranging from about 1 microsecond to several years will be carried out. XTE's design and flexibility of operations will allow it to respond rapidly to changes in the X-ray sky (within hours) and will facilitate multifrequency observations. It is scheduled for launch on a Delta Il vehicle prior to April 1996. C1 NASA,GODDARD SPACE FLIGHT CTR,GREENBELT,MD 20771. UNIV CALIF SAN DIEGO,LA JOLLA,CA 92093. RP BRADT, HV (reprint author), MIT,37587,CAMBRIDGE,MA 02139, USA. RI Swank, Jean/F-2693-2012 NR 5 TC 458 Z9 461 U1 0 U2 1 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 0365-0138 J9 ASTRON ASTROPHYS SUP JI Astron. Astrophys. Suppl. Ser. PD JAN PY 1993 VL 97 IS 1 BP 355 EP 360 PG 6 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA KJ736 UT WOS:A1993KJ73600086 ER PT J AU HOLT, SS AF HOLT, SS TI HIGH-ENERGY SPECTROSCOPY WITH THE AXAF SO ASTRONOMY & ASTROPHYSICS SUPPLEMENT SERIES LA English DT Article; Proceedings Paper CT INTERNATIONAL SYMP ON RECENT ADVANCES IN HIGH ENERGY ASTRONOMY CY MAR 17-20, 1992 CL TOULOUSE, FRANCE SP CTR NATL ETUDES SPATIALES, CNRS, CONSEIL REG MIDI PYRENEES, CEA, UNIV PAUL SABATIER TOULOUSE, CTR ETUDE SPATIALE RAYONNEMENTS DE ARTIFICIAL SATELLITES; TELESCOPES; INSTRUMENTATION, DETECTORS X-RAYS, GENERAL ID RAY AB The AXAF is a meter-class X-ray telescope that is planned to be the third of NASA's Great Observatories, joining the Hubble Space Telescope and the Compton Gamma Ray Observatory in orbit before the end of this decade. The telescope will approach tenth-arc-second resolution over a dynamic range of 100 (0.1-10 keV). An assortment of gratings and focal plane detectors will be utilized to provide unprecedented imaging and spectroscopic capabilities in a long-lived facility. In particular, the AXAF is unique in its high resolution imaging, and in the hard X-ray spectroscopy that can be performed with both high resolution and high throughput. RP HOLT, SS (reprint author), NASA,GODDARD SPACE FLIGHT CTR,CODE 600,GREENBELT,MD 20771, USA. NR 9 TC 3 Z9 3 U1 0 U2 0 PU EDITIONS PHYSIQUE PI LES ULIS CEDEX PA Z I DE COURTABOEUF AVE 7 AV DU HOGGAR, BP 112, 91944 LES ULIS CEDEX, FRANCE SN 0365-0138 J9 ASTRON ASTROPHYS SUP JI Astron. Astrophys. Suppl. Ser. PD JAN PY 1993 VL 97 IS 1 BP 367 EP 369 PG 3 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA KJ736 UT WOS:A1993KJ73600088 ER PT J AU MAHONEY, WA CALLAS, JL LING, JC RADOCINSKI, RG SKELTON, RT VARNELL, LS WHEATON, WA AF MAHONEY, WA CALLAS, JL LING, JC RADOCINSKI, RG SKELTON, RT VARNELL, LS WHEATON, WA TI GAMMA-RAY IMAGING WITH GERMANIUM DETECTORS SO ASTRONOMY & ASTROPHYSICS SUPPLEMENT SERIES LA English DT Article DE INSTRUMENTATION, DETECTORS; TELESCOPES; GAMMA-RAYS, OBSERVATIONS ID POSITRON-ANNIHILATION RADIATION AB Externally segmented germanium detectors promise a breakthrough in gamma-ray imaging capabilities while retaining the superb energy resolution of germanium spectrometers. By combining existing position-sensitive detectors with an appropriate coded aperture, two-dimensional imaging with 0.2-degrees angular resolution becomes practical for a typical balloon experiment. Much finer resolutions are possible with larger separations between the detectors and the coded aperture as would be applicable for space-based or lunar-based observatories. Two coaxial germanium detectors divided into five external segments have been fabricated and have undergone extensive performance evaluation and imaging testing in our laboratory. These tests together with detailed Monte Carlo modeling calculations have demonstrated the great promise of this sensor technology for future gamma-ray missions. RP MAHONEY, WA (reprint author), CALTECH, JET PROP LAB 169-327, 4800 OAK GROVE DR, PASADENA, CA 91109 USA. NR 11 TC 1 Z9 1 U1 0 U2 1 PU EDP SCIENCES S A PI LES ULIS CEDEX A PA 17, AVE DU HOGGAR, PA COURTABOEUF, BP 112, F-91944 LES ULIS CEDEX A, FRANCE SN 0365-0138 J9 ASTRON ASTROPHYS SUP JI Astron. Astrophys. Suppl. Ser. PD JAN PY 1993 VL 97 IS 1 BP 385 EP 388 PG 4 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA KJ736 UT WOS:A1993KJ73600090 ER PT J AU VERTER, F AF VERTER, F TI EFFECT OF MALMQUIST BIAS ON CORRELATION STUDIES WITH THE IRAS DATA-BASE SO ASTROPHYSICAL JOURNAL LA English DT Article DE GALAXIES, PHOTOMETRY; INFRARED, GALAXIES ID LUMINOSITY FUNCTIONS; SYSTEMATIC PROPERTIES; SPIRAL GALAXIES; VIRGO CLUSTER; CO EMISSION; REGRESSION; VELOCITY; SAMPLE AB This paper aims to cover four points: First, we reiterate the observation that Malmquist bias is a serious effect in optical galaxy catalogs (e.g., Tammann et al. 1979) and is even more severe in the deeper IRAS survey (e.g., Strauss et al. 1992). Second, we demonstrate that the removal of Malmquist bias in correlation and regression studies of global galaxy luminosities alters their results significantly. Third, we have developed a new procedure for removing Malmquist bias in linear regression statistics that is presented in an appendix. Fourth, we argue that detailed interpretation of the results from statistical studies with the IRAS data base must await improved treatment of bias in the galaxy samples and improved models of emission regions in individual galaxies. The data presented here are log-log plots of the global galaxy luminoSities L(FIR), L(Halpha) and L(B), as well as ratios of galaxy emission at these wavelengths, for galaxies drawn from the Halpha survey of Kennicutt & Kent (1983). These same galaxy properties have been studied before, using subsets of the same survey, by both Lonsdale Persson & Helou (1987) and Trinchieri, Fabbiano, & Bandiera (1989). These previous two studies disagreed slightly in the strength of the correlation results, and disagreed drastically in their physical interpretation of the galaxy emission. The statistical tests presented here are linear regressions that have been corrected for Malmquist bias. Our treatment of the Malmquist bias in linear regressions is the first to appear in the astronomical literature. Error bars are derived for both the correlation and regression results by bootstrap resampling. We find that the removal of Malmquist bias significantly alters the results of the statistical tests, in general lowering the correlation confidence and lowering the best-fit slope. The effect of the bias differs from case to case, so that once it is removed the relative strength of the results is also reordered. All the luminosity-luminosity plots are now consistent, to within 2 sigma, with slope unity, as would be expected for a pure luminosity increase with galaxy size. RP VERTER, F (reprint author), NASA,GODDARD SPACE FLIGHT CTR,GREENBELT,MD 20771, USA. NR 40 TC 4 Z9 4 U1 0 U2 0 PU UNIV CHICAGO PRESS PI CHICAGO PA 5720 S WOODLAWN AVE, CHICAGO, IL 60637 SN 0004-637X J9 ASTROPHYS J JI Astrophys. J. PD JAN 1 PY 1993 VL 402 IS 1 BP 141 EP 159 DI 10.1086/172118 PN 1 PG 19 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA KD944 UT WOS:A1993KD94400011 ER PT J AU WOLFIRE, MG HOLLENBACH, D TIELENS, AGGM AF WOLFIRE, MG HOLLENBACH, D TIELENS, AGGM TI CO (J = 1-0) LINE EMISSION FROM GIANT MOLECULAR CLOUDS SO ASTROPHYSICAL JOURNAL LA English DT Article DE ISM, CLOUDS; ISM, MOLECULES; LINE, FORMATION; MOLECULAR PROCESSES ID INTER-STELLAR CLOUDS; STEADY-STATE MODELS; WARM NEUTRAL HALOS; CARBON-MONOXIDE; PHOTODISSOCIATION REGIONS; ULTRAVIOLET-RADIATION; HYDROSTATIC MODELS; INFRARED-EMISSION; INTERSTELLAR CO; OUTER GALAXY AB We present numerical models of the (CO)-C-12 (J = 1-0) line emission from Giant Molecular Clouds (GMCs). The models calculate simultaneously the gas chemistry, thermal balance, and line transfer in a GMC of column density congruent-to 10(22) cm-2 (A(V) congruent-to 10) which is illuminated by an ultraviolet radiation field and subject to cosmic-ray heating and ionization. Line profiles are calculated for both microturbulent and macroturbulent cloud models. In the microturbulent case the line arises from gas with a supersonic velocity distribution with dispersion velocity on the order of the observed line width. In the macroturbulent case the line arises from a distribution of moving clumps, each with intrinsic line width which is on the order of the thermal line width and much smaller than the velocity dispersion of clumps. The typical clump-clump speed is of order of the observed line width. A theoretical plot of the CO luminosity versus cloud mass is constructed, and the variation in luminosity with incident radiation field and metallicity is investigated. Our main conclusions are the following: (1) The profile of the observed CO (J = 1-0) line cannot be interpreted as arising from a microturbulent gas velocity distribution. Microturbulent models produce emission with a wide range in profile shapes (i.e., self-absorbed profiles) and peak brightness temperatures in contrast to the observations. (2) Macroturbulent models can produce centrally peaked, smooth profiles, but only when many clumps are contained within the telescope beam. (3) Photoelectric heating dominates in the region where the CO (J = 1-0) line arises. Cosmic-ray heating alone is insufficient. In the absence of photoelectric heating, a cosmic-ray ionization rate of zeta = 2.4 x 10(-16) would be required to produce the observed CO (J = 1-0) line emission. This is approximately 15 times greater than the inferred rate from astrochemistry. (4) The integrated CO (J = 1-0) fine luminosity emitted from a GMC is only weakly dependent on the incident ultraviolet radiation field for fluxes up to approximately 10(3) times greater than the local Galactic field. At higher incident fluxes, GMCs with A(V) less than or similar to 10 are appreciably photodissociated resulting in a drop in CO luminosity. The critical field for dissociation is proportional to e1.6AV, and clouds with A(V) > 10 can remain molecular while illuminated by much higher fields. (5) If the hydrogen column density through a GMC is a constant (N congruent-to 10(22) cm-2), the CO luminosity is insensitive to small variations in metallicity Z up to a reduction in Z by a factor of 5, but thereafter decreases approximately linearly with Z. Alternatively, for a constant dust extinction of A(V) almost-equal-to 10 (and constant cloud mass), we find that the CO luminosity decreases by factors of 2.3 and 3.3 for reductions in Z by factors of 5 and 10, respectively. C1 NASA,AMES RES CTR,MOFFETT FIELD,CA 94035. RP WOLFIRE, MG (reprint author), HARVARD SMITHSONIAN CTR ASTROPHYS,MS 78,60 GARDEN ST,CAMBRIDGE,MA 02138, USA. NR 75 TC 80 Z9 80 U1 0 U2 2 PU UNIV CHICAGO PRESS PI CHICAGO PA 5720 S WOODLAWN AVE, CHICAGO, IL 60637 SN 0004-637X J9 ASTROPHYS J JI Astrophys. J. PD JAN 1 PY 1993 VL 402 IS 1 BP 195 EP 215 DI 10.1086/172123 PN 1 PG 21 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA KD944 UT WOS:A1993KD94400016 ER PT J AU MAGNANI, L LAROSA, TN SHORE, SN AF MAGNANI, L LAROSA, TN SHORE, SN TI THE OBSERVATION OF CORRELATED VELOCITY STRUCTURES IN A TRANSLUCENT MOLECULAR CLOUD AND IMPLICATIONS FOR TURBULENCE SO ASTROPHYSICAL JOURNAL LA English DT Article DE ISM, CLOUDS; ISM, INDIVIDUAL (MBM 16); ISM, MOLECULES; TURBULENCE ID INFRARED CIRRUS; SCALE STRUCTURE; DARK CLOUDS; TAURUS; H2CO; CO AB We present a formaldehyde map of the translucent high-latitude molecular cloud MBM 16. The molecular gas traced by the H2CO is located in spatially distinct large structures that exhibit velocity on a scale of 0.5 pc. These structures are not pressure-confined and are probably not self-gravitating. They may be transient structures. If so, we suggest that they are produced by shear flows whose scale length is of order the size of the cloud. C1 NASA,NCR,HUNTSVILLE,AL 35812. COMP SCI CORP,GHRS SCI TEAM,GREENBELT,MD 20771. UNIV ALABAMA,DEPT PHYS,HUNTSVILLE,AL 35899. OBSERV MEUDON,DEMIRM,F-98195 MEUDON,FRANCE. RP MAGNANI, L (reprint author), UNIV GEORGIA,DEPT PHYS & ASTRON,ATHENS,GA 30602, USA. NR 28 TC 21 Z9 21 U1 0 U2 0 PU UNIV CHICAGO PRESS PI CHICAGO PA 5720 S WOODLAWN AVE, CHICAGO, IL 60637 SN 0004-637X J9 ASTROPHYS J JI Astrophys. J. PD JAN 1 PY 1993 VL 402 IS 1 BP 226 EP 229 DI 10.1086/172125 PN 1 PG 4 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA KD944 UT WOS:A1993KD94400018 ER PT J AU KUMAR, N SRIVASTAVA, KM AF KUMAR, N SRIVASTAVA, KM TI STABILITY OF AN INHOMOGENEOUS 2-COMPONENT PLASMA WITH MAGNETIC VISCOSITY SO ASTROPHYSICS AND SPACE SCIENCE LA English DT Article AB The stability of a semi-infinite quasi-neutral inhomogeneous plasma with magnetic viscosity has been discussed by using JWKB approximation in which the parameters are regarded slowing varying. Dispersion relation is obtained and discussed. It is found that the inhomogeneous system is unstable for all perturbations with k(y) = 0. A dispersion relation for homogeneous plasma is also obtained and discussed. It is shown that fast and slow-MHD waves propagate in the homogeneous plasma in the limit of almost perpendicular propagation under certain conditions. C1 JET PROP LAB,PASADENA,CA 91109. RP KUMAR, N (reprint author), UNIV ROORKEE,DEPT MATH,ROORKEE 247667,UTTAR PRADESH,INDIA. NR 11 TC 0 Z9 0 U1 0 U2 0 PU KLUWER ACADEMIC PUBL PI DORDRECHT PA SPUIBOULEVARD 50, PO BOX 17, 3300 AA DORDRECHT, NETHERLANDS SN 0004-640X J9 ASTROPHYS SPACE SCI JI Astrophys. Space Sci. PD JAN PY 1993 VL 199 IS 2 BP 225 EP 240 DI 10.1007/BF00613197 PG 16 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA KL295 UT WOS:A1993KL29500006 ER PT J AU KUMAR, V KUMAR, N SRIVASTAVA, KM MITTAL, RC AF KUMAR, V KUMAR, N SRIVASTAVA, KM MITTAL, RC TI GRAVITATIONAL-INSTABILITY OF A ROTATING PARTIALLY-IONIZED PLASMA CARRYING A UNIFORM MAGNETIC-FIELD WITH HALL-EFFECT SO ASTROPHYSICS AND SPACE SCIENCE LA English DT Article AB The problem of gravitational instability of an infinite homogeneous self-gravitating medium carrying a uniform magnetic field in the presence of Hall effect has been investigated to include the effect due to rotation. The dispersion relation has been obtained. It has been found that the Jeans's criterion for the instability remains unaffected even when the effect due to rotation is considered in the presence of Hall effect carrying a uniform magnetic. C1 JET PROP LAB,PASADENA,CA 91109. RP KUMAR, V (reprint author), UNIV ROORKEE,DEPT MATH,ROORKEE 247667,UTTAR PRADESH,INDIA. NR 11 TC 4 Z9 4 U1 0 U2 0 PU KLUWER ACADEMIC PUBL PI DORDRECHT PA SPUIBOULEVARD 50, PO BOX 17, 3300 AA DORDRECHT, NETHERLANDS SN 0004-640X J9 ASTROPHYS SPACE SCI JI Astrophys. Space Sci. PD JAN PY 1993 VL 199 IS 2 BP 323 EP 331 DI 10.1007/BF00613206 PG 9 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA KL295 UT WOS:A1993KL29500015 ER PT B AU MISHCHENKO, MI TRAVIS, LD AF MISHCHENKO, MI TRAVIS, LD BE Kohnle, A Miller, WB TI LIGHT-SCATTERING BY SIZE SHAPE DISTRIBUTIONS OF NONSPHERICAL PARTICLES OF SIZE COMPARABLE TO A WAVELENGTH SO ATMOSPHERIC PROPAGATION AND REMOTE SENSING II SE PROCEEDINGS OF THE SOCIETY OF PHOTO-OPTICAL INSTRUMENTATION ENGINEERS (SPIE) LA English DT Proceedings Paper CT Conference on Atmospheric Propagation and Remote Sensing II CY APR 14-15, 1993 CL ORLANDO, FL SP SOC PHOTO OPT INSTRUMENTAT ENGINEERS C1 NASA,GODDARD INST SPACE STUDIES,HUGHES STX CORP,NEW YORK,NY 10025. RI Mishchenko, Michael/D-4426-2012 NR 0 TC 3 Z9 3 U1 0 U2 1 PU SPIE - INT SOC OPTICAL ENGINEERING PI BELLINGHAM PA PO BOX 10, BELLINGHAM, WA 98227-0010 BN 0-8194-1204-X J9 P SOC PHOTO-OPT INS PY 1993 VL 1968 BP 118 EP 129 DI 10.1117/12.154814 PG 12 WC Meteorology & Atmospheric Sciences; Optics SC Meteorology & Atmospheric Sciences; Optics GA BZ45H UT WOS:A1993BZ45H00011 ER PT S AU BAKER, DN KLIMAS, AJ PULKKINEN, TI MCPHERRON, RL AF BAKER, DN KLIMAS, AJ PULKKINEN, TI MCPHERRON, RL BE Sandahl, I Saunders, MA TI REEXAMINATION OF DRIVEN AND UNLOADING ASPECTS OF MAGNETOSPHERIC SUBSTORMS SO AURORAL AND RELATED PHENOMENA SE ADVANCES IN SPACE RESEARCH LA English DT Proceedings Paper CT SYMP ON AURORAL AND RELATED PHENOMENA, AT THE COSPAR 29TH PLENARY MEETING CY AUG 28-SEP 05, 1992 CL WASHINGTON, DC SP COMM SPACE RES, SCI COMM SOLAR TERRESTRIAL PHYS RP BAKER, DN (reprint author), NASA,GODDARD SPACE FLIGHT CTR,GREENBELT,MD 20771, USA. RI Pulkkinen, Tuija/D-8403-2012 OI Pulkkinen, Tuija/0000-0002-6317-381X NR 0 TC 3 Z9 3 U1 0 U2 0 PU PERGAMON PRESS LTD PI OXFORD PA OXFORD SN 0273-1177 BN 0-08-042196-2 J9 ADV SPACE RES PY 1993 VL 13 BP 75 EP 83 PG 9 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA BX86T UT WOS:A1993BX86T00013 ER PT S AU NAKAMURA, R BAKER, DN FAIRFIELD, DH MITCHELL, DG MCPHERRON, RL AF NAKAMURA, R BAKER, DN FAIRFIELD, DH MITCHELL, DG MCPHERRON, RL BE Sandahl, I Saunders, MA TI PLASMA-FLOW AND MAGNETIC-FIELD CHARACTERISTICS IN THE MIDTAIL REGION SO AURORAL AND RELATED PHENOMENA SE ADVANCES IN SPACE RESEARCH LA English DT Proceedings Paper CT SYMP ON AURORAL AND RELATED PHENOMENA, AT THE COSPAR 29TH PLENARY MEETING CY AUG 28-SEP 05, 1992 CL WASHINGTON, DC SP COMM SPACE RES, SCI COMM SOLAR TERRESTRIAL PHYS RP NAKAMURA, R (reprint author), NASA,GODDARD SPACE FLIGHT CTR,GSFC,CODE 690,GREENBELT,MD 20771, USA. RI Nakamura, Rumi/I-7712-2013 OI Nakamura, Rumi/0000-0002-2620-9211 NR 0 TC 0 Z9 0 U1 0 U2 0 PU PERGAMON PRESS LTD PI OXFORD PA OXFORD SN 0273-1177 BN 0-08-042196-2 J9 ADV SPACE RES PY 1993 VL 13 BP 223 EP 228 PG 6 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA BX86T UT WOS:A1993BX86T00034 ER PT S AU HESSE, M BIRN, J AF HESSE, M BIRN, J BE Sandahl, I Saunders, MA TI PARALLEL ELECTRIC-FIELDS AS ACCELERATION MECHANISMS IN 3-DIMENSIONAL MAGNETIC RECONNECTION SO AURORAL AND RELATED PHENOMENA SE ADVANCES IN SPACE RESEARCH LA English DT Proceedings Paper CT SYMP ON AURORAL AND RELATED PHENOMENA, AT THE COSPAR 29TH PLENARY MEETING CY AUG 28-SEP 05, 1992 CL WASHINGTON, DC SP COMM SPACE RES, SCI COMM SOLAR TERRESTRIAL PHYS RP HESSE, M (reprint author), NASA,GODDARD SPACE FLIGHT CTR,CODE 696,GREENBELT,MD 20771, USA. RI Hesse, Michael/D-2031-2012 NR 0 TC 0 Z9 0 U1 0 U2 0 PU PERGAMON PRESS LTD PI OXFORD PA OXFORD SN 0273-1177 BN 0-08-042196-2 J9 ADV SPACE RES PY 1993 VL 13 BP 249 EP 252 PG 4 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA BX86T UT WOS:A1993BX86T00038 ER PT J AU CHIANG, RY SAFONOV, MG HAIGES, K MADDEN, K TEKAWY, J AF CHIANG, RY SAFONOV, MG HAIGES, K MADDEN, K TEKAWY, J TI A FIXED ETA-INFINITY CONTROLLER FOR A SUPERMANEUVERABLE FIGHTER PERFORMING THE HERBST MANEUVER SO AUTOMATICA LA English DT Article DE ROBUST CONTROL; SUPERMANEUVERABLE FIGHTER; ROBUST STABILITY; ROBUST PERFORMANCE; ETA-INFINITY CONTROL; SUPERMANEUVERABILITY; HERBST MANEUVER ID DESIGN; FEEDBACK AB This paper presents an H(infinity) flight control system design case study for a supermaneuverable fighter flying the Herbst maneuver. The Herbst maneuver presents an especially challenging flight control problem because of its large ranges of airspeed, angle of attack and angular rates. A fixed H(infinity) controller has been developed via the mixed-sensitivity problem formulation for 20 linearized models representing the maneuver. Both linear and nonlinear full model evaluations indicate that this single H(infinity) controller together with a fixed LQR inner loop feedback have achieved ''robust stability'' and ''robust performance'' for the entire maneuver without gain scheduling. C1 INTEGRATED SYST INC,SANTA CLARA,CA 95054. NORTHROP CORP,DIV AIRCRAFT,HAWTHORNE,CA 90250. UNIV SO CALIF,DEPT ELECT ENGN SYST,LOS ANGELES,CA 90089. RP CHIANG, RY (reprint author), JET PROP LAB,GUIDANCE & CONTROL SECT,4800 OAK GROVE DR,PASADENA,CA 91109, USA. NR 25 TC 18 Z9 26 U1 0 U2 1 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0005-1098 J9 AUTOMATICA JI Automatica PD JAN PY 1993 VL 29 IS 1 BP 111 EP 127 DI 10.1016/0005-1098(93)90176-T PG 17 WC Automation & Control Systems; Engineering, Electrical & Electronic SC Automation & Control Systems; Engineering GA KG851 UT WOS:A1993KG85100009 ER PT J AU GARG, S AF GARG, S TI ROBUST INTEGRATED FLIGHT PROPULSION CONTROL DESIGN FOR A STOVL AIRCRAFT USING ETA-INFINITY CONTROL DESIGN TECHNIQUES SO AUTOMATICA LA English DT Article DE ROBUST CONTROL; ROBUSTNESS ANALYSIS; CONTROL SYSTEM SYNTHESIS; CENTRALIZED CONTROL; FLIGHT CONTROL; PROPULSION CONTROL; INTEGRATED PLANT CONTROL; CONTROL APPLICATIONS AB Results are presented from an application of H(infinity) control design methodology to a centralized integrated flight/propulsion control (IFPC) system design for a supersonic Short Take-Off and Vertical Landing (STOVL) fighter aircraft in transition flight. The emphasis is on formulating the H(infinity) optimal control synthesis problem such that the critical requirements for the flight and propulsion systems are adequately reflected within the linear, centralized control problem formulation and the resulting controller provides robustness to modelling uncertainties and model parameter variations with flight condition. Experience gained from a preliminary H(infinity) based IFPC design study performed earlier is used as the basis to formulate the robust H(infinity) control design problem and improve upon the previous design. Detailed evaluation results are presented for a reduced order controller obtained from the improved H(infinity) control design showing that the control design meets the specified nominal performance objective as well as provides stability robustness for variations in plant system dynamics with changes in aircraft trim speed within the transition flight envelope. RP GARG, S (reprint author), NASA,LEWIS RES CTR,ADV CONTROL TECHNOL BRANCH,CLEVELAND,OH 44135, USA. NR 22 TC 27 Z9 29 U1 0 U2 5 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0005-1098 J9 AUTOMATICA JI Automatica PD JAN PY 1993 VL 29 IS 1 BP 129 EP 145 DI 10.1016/0005-1098(93)90177-U PG 17 WC Automation & Control Systems; Engineering, Electrical & Electronic SC Automation & Control Systems; Engineering GA KG851 UT WOS:A1993KG85100010 ER PT J AU CAMPBELL, MR BILLICA, RD JOHNSTON, SL AF CAMPBELL, MR BILLICA, RD JOHNSTON, SL TI ANIMAL SURGERY IN MICROGRAVITY SO AVIATION SPACE AND ENVIRONMENTAL MEDICINE LA English DT Article AB The first surgical procedure in microgravity using an animal model is described. The investigation resulted in a realistic evaluation of prototype hardware and procedures that could be applied to a surgical support system on Space Station Freedom. This was especially true for the issue of the management of surgical bleeding, which was observed and studied in microgravity for the first time. C1 NASA,LYNDON B JOHNSON SPACE CTR,HOUSTON,TX 77058. KRUG LIFE SCI,HOUSTON,TX. RP CAMPBELL, MR (reprint author), CLIFTON MED & SURG CLIN ASSOC,201 S AVE T,CLIFTON,TX 76634, USA. NR 8 TC 29 Z9 30 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 JAN PY 1993 VL 64 IS 1 BP 58 EP 62 PG 5 WC Public, Environmental & Occupational Health; Medicine, General & Internal; Sport Sciences SC Public, Environmental & Occupational Health; General & Internal Medicine; Sport Sciences GA KF510 UT WOS:A1993KF51000011 PM 8424742 ER PT S AU PURVIS, CK AF PURVIS, CK BE Dewitt, RN Duston, D Hyder, AK TI OVERVIEW FROM A SYSTEMS PERSPECTIVE SO BEHAVIOR OF SYSTEMS IN THE SPACE ENVIRONMENT: PROCEEDINGS, PITLOCHRY, SCOTLAND, 1991 SE NATO ADVANCED SCIENCE INSTITUTES SERIES, SERIES E, APPLIED SCIENCES LA English DT Proceedings Paper CT NATO Advanced Study Institute on The Behavior of Systems in the Space Environment CY JUL 07-19, 1991 CL PITLOCHRY, SCOTLAND SP NATO C1 NASA,LEWIS RES CTR,CLEVELAND,OH 44135. NR 0 TC 0 Z9 0 U1 0 U2 0 PU KLUWER ACADEMIC PUBL PI DORDRECHT PA PO BOX 17, 3300 AA DORDRECHT, NETHERLANDS SN 0168-132X BN 0-7923-2453-6 J9 NATO ADV SCI INST SE PY 1993 VL 245 BP 23 EP 44 PG 22 WC Engineering, Aerospace SC Engineering GA BZ91L UT WOS:A1993BZ91L00002 ER PT S AU STIEGMAN, AE LIANG, RH AF STIEGMAN, AE LIANG, RH BE Dewitt, RN Duston, D Hyder, AK TI ULTRAVIOLET AND VACUUM-ULTRAVIOLET RADIATION EFFECTS ON SPACECRAFT THERMAL CONTROL MATERIALS SO BEHAVIOR OF SYSTEMS IN THE SPACE ENVIRONMENT: PROCEEDINGS, PITLOCHRY, SCOTLAND, 1991 SE NATO ADVANCED SCIENCE INSTITUTES SERIES, SERIES E, APPLIED SCIENCES LA English DT Proceedings Paper CT NATO Advanced Study Institute on The Behavior of Systems in the Space Environment CY JUL 07-19, 1991 CL PITLOCHRY, SCOTLAND SP NATO C1 JET PROP LAB,PASADENA,CA 91109. NR 0 TC 0 Z9 0 U1 0 U2 0 PU KLUWER ACADEMIC PUBL PI DORDRECHT PA PO BOX 17, 3300 AA DORDRECHT, NETHERLANDS SN 0168-132X BN 0-7923-2453-6 J9 NATO ADV SCI INST SE PY 1993 VL 245 BP 259 EP 266 PG 8 WC Engineering, Aerospace SC Engineering GA BZ91L UT WOS:A1993BZ91L00011 ER PT S AU BRINZA, DE AF BRINZA, DE BE Dewitt, RN Duston, D Hyder, AK TI AN OVERVIEW OF THE LONG-DURATION EXPOSURE FACILITY - CASE-STUDIES FOR THE EFFECTS OF THE SPACE ENVIRONMENT ON SPACECRAFT SYSTEMS SO BEHAVIOR OF SYSTEMS IN THE SPACE ENVIRONMENT: PROCEEDINGS, PITLOCHRY, SCOTLAND, 1991 SE NATO ADVANCED SCIENCE INSTITUTES SERIES, SERIES E, APPLIED SCIENCES LA English DT Proceedings Paper CT NATO Advanced Study Institute on The Behavior of Systems in the Space Environment CY JUL 07-19, 1991 CL PITLOCHRY, SCOTLAND SP NATO C1 JET PROP LAB,PASADENA,CA 91109. NR 0 TC 0 Z9 0 U1 0 U2 0 PU KLUWER ACADEMIC PUBL PI DORDRECHT PA PO BOX 17, 3300 AA DORDRECHT, NETHERLANDS SN 0168-132X BN 0-7923-2453-6 J9 NATO ADV SCI INST SE PY 1993 VL 245 BP 655 EP 667 PG 13 WC Engineering, Aerospace SC Engineering GA BZ91L UT WOS:A1993BZ91L00026 ER PT S AU STOKLOSA, JH DICKSON, KJ AF STOKLOSA, JH DICKSON, KJ BE Dewitt, RN Duston, D Hyder, AK TI THE HUMAN SYSTEM IN-SPACE SO BEHAVIOR OF SYSTEMS IN THE SPACE ENVIRONMENT: PROCEEDINGS, PITLOCHRY, SCOTLAND, 1991 SE NATO ADVANCED SCIENCE INSTITUTES SERIES, SERIES E, APPLIED SCIENCES LA English DT Proceedings Paper CT NATO Advanced Study Institute on The Behavior of Systems in the Space Environment CY JUL 07-19, 1991 CL PITLOCHRY, SCOTLAND SP NATO C1 NASA,DIV LIFE SCI,BIOMED RES PROGRAM,WASHINGTON,DC 20546. NR 0 TC 0 Z9 0 U1 0 U2 0 PU KLUWER ACADEMIC PUBL PI DORDRECHT PA PO BOX 17, 3300 AA DORDRECHT, NETHERLANDS SN 0168-132X BN 0-7923-2453-6 J9 NATO ADV SCI INST SE PY 1993 VL 245 BP 731 EP 778 PG 48 WC Engineering, Aerospace SC Engineering GA BZ91L UT WOS:A1993BZ91L00029 ER PT S AU FLOOD, DJ AF FLOOD, DJ BE Dewitt, RN Duston, D Hyder, AK TI ADVANCED SPACE PHOTOVOLTAIC TECHNOLOGY SO BEHAVIOR OF SYSTEMS IN THE SPACE ENVIRONMENT: PROCEEDINGS, PITLOCHRY, SCOTLAND, 1991 SE NATO ADVANCED SCIENCE INSTITUTES SERIES, SERIES E, APPLIED SCIENCES LA English DT Proceedings Paper CT NATO Advanced Study Institute on The Behavior of Systems in the Space Environment CY JUL 07-19, 1991 CL PITLOCHRY, SCOTLAND SP NATO C1 NASA,LEWIS RES CTR,CLEVELAND,OH 44135. NR 0 TC 0 Z9 0 U1 0 U2 0 PU KLUWER ACADEMIC PUBL PI DORDRECHT PA PO BOX 17, 3300 AA DORDRECHT, NETHERLANDS SN 0168-132X BN 0-7923-2453-6 J9 NATO ADV SCI INST SE PY 1993 VL 245 BP 795 EP 823 PG 29 WC Engineering, Aerospace SC Engineering GA BZ91L UT WOS:A1993BZ91L00031 ER PT S AU BANKS, BA RUTLEDGE, SK DEGROH, KK AUER, BM HILL, CM AF BANKS, BA RUTLEDGE, SK DEGROH, KK AUER, BM HILL, CM BE Dewitt, RN Duston, D Hyder, AK TI ATOMIC OXYGEN PROTECTIVE COATINGS SO BEHAVIOR OF SYSTEMS IN THE SPACE ENVIRONMENT: PROCEEDINGS, PITLOCHRY, SCOTLAND, 1991 SE NATO ADVANCED SCIENCE INSTITUTES SERIES, SERIES E, APPLIED SCIENCES LA English DT Proceedings Paper CT NATO Advanced Study Institute on The Behavior of Systems in the Space Environment CY JUL 07-19, 1991 CL PITLOCHRY, SCOTLAND SP NATO C1 NASA,LEWIS RES CTR,CLEVELAND,OH 44135. NR 0 TC 0 Z9 0 U1 0 U2 0 PU KLUWER ACADEMIC PUBL PI DORDRECHT PA PO BOX 17, 3300 AA DORDRECHT, NETHERLANDS SN 0168-132X BN 0-7923-2453-6 J9 NATO ADV SCI INST SE PY 1993 VL 245 BP 913 EP 919 PG 7 WC Engineering, Aerospace SC Engineering GA BZ91L UT WOS:A1993BZ91L00042 ER PT S AU FERGUSON, DC AF FERGUSON, DC BE Dewitt, RN Duston, D Hyder, AK TI LOW-EARTH-ORBIT SPACE PLASMA HIGH-VOLTAGE SYSTEM INTERACTIONS SO BEHAVIOR OF SYSTEMS IN THE SPACE ENVIRONMENT: PROCEEDINGS, PITLOCHRY, SCOTLAND, 1991 SE NATO ADVANCED SCIENCE INSTITUTES SERIES, SERIES E, APPLIED SCIENCES LA English DT Proceedings Paper CT NATO Advanced Study Institute on The Behavior of Systems in the Space Environment CY JUL 07-19, 1991 CL PITLOCHRY, SCOTLAND SP NATO C1 NASA,LEWIS RES CTR,CLEVELAND,OH 44135. NR 0 TC 1 Z9 1 U1 0 U2 1 PU KLUWER ACADEMIC PUBL PI DORDRECHT PA PO BOX 17, 3300 AA DORDRECHT, NETHERLANDS SN 0168-132X BN 0-7923-2453-6 J9 NATO ADV SCI INST SE PY 1993 VL 245 BP 935 EP 942 PG 8 WC Engineering, Aerospace SC Engineering GA BZ91L UT WOS:A1993BZ91L00045 ER PT B AU WALLACE, TA BIRD, RK WIEDEMANN, KE AF WALLACE, TA BIRD, RK WIEDEMANN, KE TI THE EFFECT OF OXIDATION ON THE MECHANICAL-PROPERTIES OF BETA-21S SO BETA TITANIUM ALLOYS IN THE 1990S LA English DT Proceedings Paper CT Symposium on Beta Titanium Alloys, at the 1993 Annual TMS Meeting CY FEB 22-24, 1993 CL DENVER, CO SP MINERALS MET & MAT SOC C1 NASA LANGLEY RES CTR,HAMPTON,VA 23681. NR 0 TC 3 Z9 3 U1 0 U2 0 PU MINERALS, METALS & MATERIALS SOC PI WARRENDALE PA 420 COMMONWEALTH DR, WARRENDALE, PA 15086 BN 0-87339-200-0 PY 1993 BP 115 EP 126 PG 12 GA BZ43T UT WOS:A1993BZ43T00010 ER PT J AU BRYSON, S FREEDMAN, MH HE, ZX WANG, ZH AF BRYSON, S FREEDMAN, MH HE, ZX WANG, ZH TI MOBIUS INVARIANCE OF KNOT ENERGY SO BULLETIN OF THE AMERICAN MATHEMATICAL SOCIETY LA English DT Article AB A physically natural potential energy for simple closed curves in R3 is shown to be invariant under Mobius transformations. This leads to the rapid resolution of several open problems: round circles are precisely the absolute minima for energy; there is a minimum energy threshold below which knotting cannot occur; minimizers within prime knot types exist and are regular. Finally, the number of knot types with energy less than any constant M is estimated. C1 UNIV CALIF SAN DIEGO,DEPT MATH,LA JOLLA,CA 92093. PRINCETON UNIV,DEPT MATH,PRINCETON,NJ 08544. RP BRYSON, S (reprint author), NASA,AMES RES CTR,COMP SCI CORP,MOFFETT FIELD,CA 94035, USA. NR 8 TC 10 Z9 10 U1 2 U2 2 PU AMER MATHEMATICAL SOC PI PROVIDENCE PA 201 CHARLES ST, PROVIDENCE, RI 02940-2213 SN 0273-0979 J9 B AM MATH SOC JI Bull. Amer. Math. Soc. PD JAN PY 1993 VL 28 IS 1 BP 99 EP 103 DI 10.1090/S0273-0979-1993-00348-3 PG 5 WC Mathematics SC Mathematics GA KG818 UT WOS:A1993KG81800006 ER PT J AU YOSHIMOTO, SS CLARKE, RP AF YOSHIMOTO, SS CLARKE, RP TI COMPARING DYNAMIC VERSIONS OF THE SCHAEFER AND FOX PRODUCTION MODELS AND THEIR APPLICATION TO LOBSTER FISHERIES SO CANADIAN JOURNAL OF FISHERIES AND AQUATIC SCIENCES LA English DT Article ID PANULIRUS-CYGNUS; STOCK AB Dynamic approaches (integrated and finite difference) to the Schaefer and Fox production models are applied to four commercial lobster fisheries. The integrated versions provided better predictions than their finite difference counterparts. Only the integrated version of the Fox model provides realistic (positive) biological parameter estimates for all four fisheries, and bootstrapping reveals those estimates to be generally stable. Additionally, this model performs well when applied to data where certain assumptions of surplus production modeling are fulfilled. The results suggest further investigation of the integration procedure. RP YOSHIMOTO, SS (reprint author), NOAA,NATL MARINE FISHERIES SERV,SW FISHERIES SCI CTR,HONOLULU LAB,2570 DOLE ST,HONOLULU,HI 96822, USA. NR 28 TC 10 Z9 11 U1 0 U2 3 PU NATL RESEARCH COUNCIL CANADA PI OTTAWA PA RESEARCH JOURNALS, MONTREAL RD, OTTAWA ON K1A 0R6, CANADA SN 0706-652X J9 CAN J FISH AQUAT SCI JI Can. J. Fish. Aquat. Sci. PD JAN PY 1993 VL 50 IS 1 BP 181 EP 189 PG 9 WC Fisheries; Marine & Freshwater Biology SC Fisheries; Marine & Freshwater Biology GA LK295 UT WOS:A1993LK29500020 ER PT J AU FERGUSON, FT LILLELEHT, LU NUTH, JA STEPHENS, JR AF FERGUSON, FT LILLELEHT, LU NUTH, JA STEPHENS, JR TI MICROGRAVITY NUCLEATION OF REFRACTORY MATERIALS - MODELING OF TRANSPORT PROCESSES IN THE NUCLEATION CHAMBER SO CHEMICAL ENGINEERING COMMUNICATIONS LA English DT Article ID HOMOGENEOUS NUCLEATION; CONDENSATION; GRAINS; SILVER; VAPOR AB A two-part mathematical model has been developed to describe the transport processes in a nucleation chamber designed for condensation of refractory vapors in a microgravity environment. The model solves the transient diffusion equations for temperature and concentration fields in cylindrical coordinates using finite differences and the alternating direction implicit method. Vapor supersaturation ratios are then computed from the evolving concentration profiles thus permitting one to estimate the conditions at the location in the chamber where nucleation is observed in experiments. C1 UNIV VIRGINIA,DEPT CHEM ENGN,CHARLOTTESVILLE,VA 22903. NASA,GODDARD SPACE FLIGHT CTR,GREENBELT,MD 20771. MATRIX INC,SANTA FE,NM 87501. RI Ferguson, Frank/C-9493-2012; Nuth, Joseph/E-7085-2012 NR 15 TC 1 Z9 1 U1 0 U2 0 PU GORDON BREACH SCI PUBL LTD PI READING PA C/O STBS LTD PO BOX 90, READING, BERKS, ENGLAND RG1 8JL SN 0098-6445 J9 CHEM ENG COMMUN JI Chem. Eng. Commun. PY 1993 VL 125 BP 63 EP 76 DI 10.1080/00986449308936193 PG 14 WC Engineering, Chemical SC Engineering GA MW339 UT WOS:A1993MW33900005 ER PT B AU ARRHENIUS, G GEDULIN, B MOJZSIS, S AF ARRHENIUS, G GEDULIN, B MOJZSIS, S BE Ponnamperuma, C ChelaFlores, J TI PHOSPHATE IN MODELS FOR CHEMICAL EVOLUTION SO CHEMICAL EVOLUTION: ORIGIN OF LIFE SE STUDIES IN CHEMICAL EVOLUTION AND THE ORIGIN OF LIFE LA English DT Proceedings Paper CT Conference on Chemical Evolution and the Origin of Life CY OCT 26-30, 1992 CL TRIESTE, ITALY C1 UNIV CALIF SAN DIEGO,SCRIPPS INST OCEANOG,NASA,CTR EXOBIOL,LA JOLLA,CA 92093. NR 0 TC 9 Z9 9 U1 0 U2 0 PU A DEEPAK PUBLISHING PI HAMPTON PA 101 RESEARCH DRIVE, PO BOX 7390, HAMPTON, VA 23666 BN 0-937194-31-X J9 ST CHEM EVOL & ORIG PY 1993 BP 25 EP 50 PG 26 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA BA62S UT WOS:A1993BA62S00003 ER PT J AU LEE, TJ JAYATILAKA, D AF LEE, TJ JAYATILAKA, D TI AN OPEN-SHELL RESTRICTED HARTREE-FOCK PERTURBATION-THEORY BASED ON SYMMETRICAL SPIN ORBITALS SO CHEMICAL PHYSICS LETTERS LA English DT Article ID GAUSSIAN BASIS FUNCTIONS; ATOMIC BASIS SETS; FIRST-ROW ATOMS; CONFIGURATION-INTERACTION; MOLECULAR CALCULATIONS; EQUILIBRIUM GEOMETRY; COUPLED-CLUSTER; WAVE-FUNCTIONS; ENERGY; 2-CONFIGURATION AB A new open-shell perturbation theory is formulated in terms of symmetric spin orbitals. Only one set of spatial orbitals is required, thereby reducing the number of independent coefficients in the perturbed wavefunctions. For second order, the computational cost is shown to be similar to a closed-shell calculation. This formalism is therefore more efficient than the recently developed RMP, ROMP or RMP-MBPT theories. The perturbation theory described herein was designed to have a close correspondence with our recently proposed coupled-cluster theory based on symmetric spin orbitals. The first-order wavefunction contains contributions from only doubly excited determinants. Equilibrium structures and vibrational frequencies determined from second-order perturbation theory are presented for OH, NH, CH, O2, NH2 and CH2. RP LEE, TJ (reprint author), NASA,AMES RES CTR,MOFFETT FIELD,CA 94035, USA. RI Jayatilaka, Dylan/B-3498-2012; Lee, Timothy/K-2838-2012 OI Jayatilaka, Dylan/0000-0002-3349-5834; NR 29 TC 112 Z9 113 U1 0 U2 8 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0009-2614 J9 CHEM PHYS LETT JI Chem. Phys. Lett. PD JAN 1 PY 1993 VL 201 IS 1-4 BP 1 EP 10 DI 10.1016/0009-2614(93)85024-I PG 10 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA KF379 UT WOS:A1993KF37900001 ER PT J AU BAUSCHLICHER, CW AF BAUSCHLICHER, CW TI THE GROUND AND LOW-LYING EXCITED-STATES OF MGH2+ SO CHEMICAL PHYSICS LETTERS LA English DT Article ID 2ND-ROW ATOMS; BASIS-SETS; ORBITALS; SPECTRA AB The ground state and low-lying states of MgH2+ are studied at the complete-active-space self-consistent-field and multireference configuration-interaction levels of theory. The binding energies of the 2B1 and 2B2 states (relative to their asymptote) are significantly larger than that of the 2A1 ground state. The Mg+ inserts into the H-2 bond for the 2B2 state. The (2)2A1 state is very weakly bound, because the Mg-H-2 repulsion is larger than in the ground state. RP BAUSCHLICHER, CW (reprint author), NASA,AMES RES CTR,MOFFETT FIELD,CA 94035, USA. NR 18 TC 39 Z9 39 U1 1 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0009-2614 J9 CHEM PHYS LETT JI Chem. Phys. Lett. PD JAN 1 PY 1993 VL 201 IS 1-4 BP 11 EP 14 DI 10.1016/0009-2614(93)85025-J PG 4 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA KF379 UT WOS:A1993KF37900002 ER PT S AU CHANG, S AF CHANG, S BE Greenberg, JM MendozaGomez, CX Pirronello, V TI PREBIOTIC SYNTHESIS IN PLANETARY ENVIRONMENTS SO CHEMISTRY OF LIFES ORIGINS SE NATO ADVANCED SCIENCE INSTITUTES SERIES, SERIES C, MATHEMATICAL AND PHYSICAL SCIENCES LA English DT Proceedings Paper CT Nato Advanced Study Institute and 2nd International School of Space Chemistry: The Chemistry of Lifes Origins CY OCT 20-30, 1991 CL E MAJORANA CTR SCI CULTURE, ERICE, ITALY SP NATO, ETTORE MAJORANA CTR SCI CULTURE HO E MAJORANA CTR SCI CULTURE C1 NASA,AMES RES CTR,PLANETARY BIOL BRANCH,MOFFETT FIELD,CA 94035. NR 0 TC 27 Z9 28 U1 0 U2 2 PU KLUWER ACADEMIC PUBL PI DORDRECHT PA PO BOX 17, 3300 AA DORDRECHT, NETHERLANDS SN 0258-2023 BN 0-7923-2517-6 J9 NATO ADV SCI INST SE PY 1993 VL 416 BP 259 EP 299 PG 41 WC Astronomy & Astrophysics; Geosciences, Multidisciplinary SC Astronomy & Astrophysics; Geology GA BZ55D UT WOS:A1993BZ55D00010 ER PT J AU MORRISSEY, LA ZOBEL, DB LIVINGSTON, GP AF MORRISSEY, LA ZOBEL, DB LIVINGSTON, GP TI SIGNIFICANCE OF STOMATAL CONTROL ON METHANE RELEASE FROM CAREX-DOMINATED WETLANDS SO CHEMOSPHERE LA English DT Article; Proceedings Paper CT NATO ADVANCED RESEARCH WORKSHOP ON ATMOSPHERIC METHANE : SOURCES, SINKS AND ROLE IN GLOBAL CHANGE CY OCT 07-11, 1991 CL MT HOOD, OR SP NATO, NATL SCI FDN, US EPA, ANDARZ ID RICE PADDIES; WATER LILIES; EMISSIONS; PLANTS; CONDUCTANCE; ATMOSPHERE; SEDIMENTS AB Experiments were conducted in Carex-dominated communities of Arctic and subarctic Alaska to determine the importance of plant stomatal behavior in modifying methane release from wetland plants. Daily methane flux was positively correlated (r = 0.95) with daily leaf conductance at three lake margin sites over an 8-day period. Furthermore, methane flux was reduced significantly following stomatal closure induced by application of an antitranspirant to the plant surface and by enclosure in an opaque chamber. These are the first data to show evidence of stomatal control of release of methane from plants. Significant methane flux continued, however, even with stomatal closure, suggesting that cuticular conductance remains an important mechanism of methane release. The importance of stomatal pathway, relative to the cuticular pathway, is expected to vary through the growing season. These results have significant implications both in the design of chamber-based measurement studies and in interpreting regional to global methane emissions from wetlands. C1 OREGON STATE UNIV,DEPT BOT & PLANT PATHOL,CORVALLIS,OR 97331. RP MORRISSEY, LA (reprint author), NASA,AMES RES CTR,MOFFETT FIELD,CA 94035, USA. NR 54 TC 65 Z9 70 U1 2 U2 20 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0045-6535 J9 CHEMOSPHERE JI Chemosphere PD JAN-FEB PY 1993 VL 26 IS 1-4 BP 339 EP 355 DI 10.1016/0045-6535(93)90430-D PG 17 WC Environmental Sciences SC Environmental Sciences & Ecology GA KM225 UT WOS:A1993KM22500024 ER PT J AU HOUTCHENS, BA AF HOUTCHENS, BA TI MEDICAL-CARE SYSTEMS FOR LONG-DURATION SPACE MISSIONS SO CLINICAL CHEMISTRY LA English DT Review AB As in the opening of frontiers on Earth, human physiological maladaptation, illness, and injury-rather than defective transportation systems-are likely to be the pace-limiting variables in efforts to expand the presence of humans into the solar system. Because of the inability of individuals to return to Earth rapidly and conveniently, the capability of delivering medical care on site will be key to the success of a manned space station, lunar base, and Mars mission. Spaceflight medical care equipment must meet stringent constraints of size, weight, and power requirements, and then must function accurately in remote, self-contained, microgravity settings after extended intervals of storage, with neither expert operators nor repair technicians on site. Satisfying these unusually rigorous requirements will require sustained direct involvement of clinically up-to-date health-care providers, medical scientists, and biomedical engineers, as well as astronauts and aerospace engineers and managers. Solutions will require validation in clinical settings with real patients, as well as in simulated operational settings. C1 SALT LAKE CITY VET AFFAIRS MED CTR,SURG SERV,SALT LAKE CITY,UT. NASA,LYNDON B JOHNSON SPACE CTR,DIV MED SCI,SPACE STN OFF,HOUSTON,TX 77058. RP HOUTCHENS, BA (reprint author), UNIV UTAH,DEPT SURG,50 N MED DR,SALT LAKE CITY,UT 84132, USA. NR 14 TC 13 Z9 14 U1 0 U2 1 PU AMER ASSOC CLINICAL CHEMISTRY PI WASHINGTON PA 2101 L STREET NW, SUITE 202, WASHINGTON, DC 20037-1526 SN 0009-9147 J9 CLIN CHEM JI Clin. Chem. PD JAN PY 1993 VL 39 IS 1 BP 13 EP 21 PG 9 WC Medical Laboratory Technology SC Medical Laboratory Technology GA KG571 UT WOS:A1993KG57100003 PM 8419036 ER PT J AU WU, AHB TAYLOR, GR GRAHAM, GA MCKINLEY, BA AF WU, AHB TAYLOR, GR GRAHAM, GA MCKINLEY, BA TI THE CLINICAL-CHEMISTRY AND IMMUNOLOGY OF LONG-DURATION SPACE MISSIONS SO CLINICAL CHEMISTRY LA English DT Article DE SPACE MEDICINE; EFFECTS OF MICROGRAVITY; ACUTE MYOCARDIAL INFARCTION; NEPHROLITHIASIS; ELECTROLYTES; OSMOLALITY; BONE; BACTERIA; IMMUNE STATUS ID RENAL STONE FORMATION; IMMUNE CELLS; BED REST; FLIGHT; CARE; SPACEFLIGHT; MICROGRAVITY; MELATONIN; MEDICINE; RECOVERY AB Clinical laboratory diagnostic capabilities are needed to guide health and medical care of astronauts during long-duration space missions. Clinical laboratory diagnostics, as defined for medical care on Earth, offers a model tor space capabilities. Interpretation of laboratory results for health and medical care of humans in space requires knowledge of specific physiological adaptations that occur, primarily because of the absence of gravity, and how these adaptations affect reference values. Limited data from American and Russian missions have indicated shifts of intra- and extracellular fluids and electrolytes, changes in hormone concentrations related to fluid shifts and stresses of the missions, reductions in bone and muscle mass, and a blunting of the cellular immune response. These changes could increase susceptibility to space-related illness or injury during a mission and after return to Earth. We review physiological adaptations and the fisk of medical problems that occur during space missions. We describe the need for laboratory diagnostics as a part of health and medical care in space, and how this capability might be delivered. C1 UNIV TEXAS, SCH MED, DEPT PATHOL & LAB MED, HOUSTON, TX 77030 USA. KRUG LIFE SCI INC, HOUSTON, TX 77058 USA. NASA, LYNDON B JOHNSON SPACE CTR, HOUSTON, TX 77058 USA. EASTMAN KODAK CO, ROCHESTER, NY 14650 USA. NR 95 TC 12 Z9 13 U1 0 U2 5 PU AMER ASSOC CLINICAL CHEMISTRY PI WASHINGTON PA 2101 L STREET NW, SUITE 202, WASHINGTON, DC 20037-1526 USA SN 0009-9147 EI 1530-8561 J9 CLIN CHEM JI Clin. Chem. PD JAN PY 1993 VL 39 IS 1 BP 22 EP 36 PG 15 WC Medical Laboratory Technology SC Medical Laboratory Technology GA KG571 UT WOS:A1993KG57100004 PM 8419055 ER PT J AU HEGDE, U ROSS, HD FACCA, LT AF HEGDE, U ROSS, HD FACCA, LT TI LONGITUDINAL MODE-INSTABILITIES OF PARTICLE CLOUD COMBUSTORS IN A REDUCED GRAVITY ENVIRONMENT SO COMBUSTION SCIENCE AND TECHNOLOGY LA English DT Article DE MICROGRAVITY; PARTICLE COMBUSTION; COMBUSTION INSTABILITY; CHATTERING FLAMES ID FLAMES AB This paper presents descriptions and analysis of novel acoustic phenomena that have been observed during the combustion of particle clouds in flame tubes in a reduced gravity environment. It has been found that flame propagation is steady for fuel-rich particle mixtures. However, for near-stoichiometric mixtures of fuel and air, the flame propagates in an unsteady ''chattering'' or vibratory fashion accompanied by high amplitude periodic pressure oscillations. A longitudinal mode combustion instability analysis of the system is formulated to explain this behavior. Predictions from the model are in good agreement with experimentally obtained data. In particular, the oscillation frequency is well predicted and it is shown that stoichiometrically rich particle mixtures may adversely affect the excitation of the flame-acoustic instability and contribute to the observed disappearance of chattering flames for fuel-rich mixtures. RP HEGDE, U (reprint author), SVERDRUP TECHNOL INC,NASA,LEWIS RES CTR GRP,CLEVELAND,OH 44135, USA. NR 17 TC 2 Z9 3 U1 0 U2 2 PU GORDON BREACH SCI PUBL LTD PI READING PA C/O STBS LTD PO BOX 90, READING, BERKS, ENGLAND RG1 8JL SN 0010-2202 J9 COMBUST SCI TECHNOL JI Combust. Sci. Technol. PY 1993 VL 94 IS 1-6 BP 279 EP 294 DI 10.1080/00102209308935315 PG 16 WC Thermodynamics; Energy & Fuels; Engineering, Multidisciplinary; Engineering, Chemical SC Thermodynamics; Energy & Fuels; Engineering GA MU626 UT WOS:A1993MU62600017 ER PT J AU BHATTACHARJEE, S ALTENKIRCH, RA SACKSTEDER, K AF BHATTACHARJEE, S ALTENKIRCH, RA SACKSTEDER, K TI IMPLICATIONS OF SPREAD RATE AND TEMPERATURE-MEASUREMENTS IN FLAME SPREAD OVER A THIN FUEL IN A QUIESCENT, MICROGRAVITY, SPACE-BASED ENVIRONMENT SO COMBUSTION SCIENCE AND TECHNOLOGY LA English DT Article AB Results and analysis of the data acquired in an experiment on laminar flame spreading at microgravity conducted on a recent Space Shuttle mission are presented. In the experiment, a thin fuel (ashless filter paper) was burnt in a quiescent environment in a 50% O2/50% N2 mixture at a total pressure of 152 kPa (1.5 atm). The entire experiment from ignition to extinction was recorded using two 16 mm cine-cameras, and the temperature of the fuel surface and at two locations in the gas phase were measured using Pt/Pt-Rh thermocouples. The flame spread rate was found from a frame-by-frame analysis of the film. The spread rate and temperature measurements are used to extract information on the fuel pyrolysis process and the different modes of heat transfer between the gas and the solid phase. Analysis of the experimental data and close inspection of the film reveal the following: i) Unlike normal gravity flames, the microgravity flame shows significant radiative heat transfer between the gas and the solid phase. ii) Following the flame spread process a substantial amount of potentially pyrolyzable fuel remains such that a stationary flame near the end of the fuel sample persists for some time. iii) The remaining solid fuel undergoes surface reaction as fresh oxygen diffuses back to and products diffuse away from the fuel surface. iv) Commonly used first-order Arrhenius pyrolysis kinetics that result in rapid and complete fuel vaporization near the leading edge of the flame provide for inconsistencies between observations ii) and iii) here and measured temperature and computed solid density profiles. C1 MISSISSIPPI STATE UNIV,DEPT MECH & NUCL ENGN,MISSISSIPPI STATE,MS 39762. NASA,LEWIS RES CTR,CLEVELAND,OH 44135. RP BHATTACHARJEE, S (reprint author), SAN DIEGO STATE UNIV,DEPT MECH ENGN,SAN DIEGO,CA 92182, USA. NR 11 TC 20 Z9 21 U1 0 U2 4 PU GORDON BREACH SCI PUBL LTD PI READING PA C/O STBS LTD PO BOX 90, READING, BERKS, ENGLAND RG1 8JL SN 0010-2202 J9 COMBUST SCI TECHNOL JI Combust. Sci. Technol. PY 1993 VL 91 IS 4-6 BP 225 EP 242 DI 10.1080/00102209308907646 PG 18 WC Thermodynamics; Energy & Fuels; Engineering, Multidisciplinary; Engineering, Chemical SC Thermodynamics; Energy & Fuels; Engineering GA LQ165 UT WOS:A1993LQ16500003 ER PT J AU MIKAMI, M KONO, M SATO, J DIETRICH, DL WILLIAMS, FA AF MIKAMI, M KONO, M SATO, J DIETRICH, DL WILLIAMS, FA TI COMBUSTION OF MISCIBLE BINARY-FUEL DROPLETS AT HIGH-PRESSURE UNDER MICROGRAVITY SO COMBUSTION SCIENCE AND TECHNOLOGY LA English DT Article ID MULTICOMPONENT AB The objective of this research is to study near-critical and super-critical combustion of droplets consisting of binary fuel mixtures. Experimental results are reported on the burning of fiber-supported droplets of mixtures of n-heptane and n-hexadecane, initially about 1 mm in diameter, under free-fall microgravity conditions. The ambient pressures range up to 3.0 MPa, extending above the critical pressure of both fuels, in room-temperature nitrogen-oxygen atmospheres having oxygen mole fractions of 0.12 and 0.13. Three-stage burning of the binary fuel droplets is observed, and the onset time of the second stage is compared with the predictions of an existing theory. Experimental evidence of thermo-capillary and/or diffuso-capillary convection during the droplet burning is obtained. The results contribute to improving understanding of binary-fuel droplet-combustion processes at high pressures. C1 UNIV TOKYO,DEPT AERONAUT,BUNKYO KU,TOKYO 113,JAPAN. ISHIKAWAJIMA HARIMA HEAVY IND CO LTD,RES INST,KOTO KU,TOKYO,JAPAN. SVERDRUP TECHNOL INC,NASA,LEWIS RES CTR,CLEVELAND,OH 44135. UNIV CALIF SAN DIEGO,DEPT APPL MECH & ENGN SCI,CTR ENERGY & COMBUST RES,LA JOLLA,CA 92093. NR 23 TC 24 Z9 25 U1 1 U2 5 PU GORDON BREACH SCI PUBL LTD PI READING PA C/O STBS LTD PO BOX 90, READING, BERKS, ENGLAND RG1 8JL SN 0010-2202 J9 COMBUST SCI TECHNOL JI Combust. Sci. Technol. PY 1993 VL 90 IS 1-4 BP 111 EP 123 DI 10.1080/00102209308907606 PG 13 WC Thermodynamics; Energy & Fuels; Engineering, Multidisciplinary; Engineering, Chemical SC Thermodynamics; Energy & Fuels; Engineering GA LZ041 UT WOS:A1993LZ04100006 ER PT J AU MACARAEG, MG JACKSON, TL HUSSAINI, MY AF MACARAEG, MG JACKSON, TL HUSSAINI, MY TI IGNITION AND STRUCTURE OF A LAMINAR DIFFUSION FLAME IN THE FIELD OF A VORTEX SO COMBUSTION SCIENCE AND TECHNOLOGY LA English DT Article ID ASYMPTOTIC ANALYSIS; THERMAL RUNAWAY AB The distortion of flames in flows with vortical motion is examined via asymptotic analysis and numerical simulation. The model consists of a constant-density, one-step, irreversible Arrhenius reaction between initially unmixed species occupying adjacent half-planes which are then allowed to mix and react in the presence of a vortex. The evolution in time of the temperature and mass-fraction fields is followed. Emphasis is placed on the ignition time and location as a function of vortex Reynolds number and initial temperature differences of the reacting species. The study brings out the influence of the vortex on the chemical reaction. In all phases, good agreement is observed between asymptotic analysis and the full numerical solution of the model equations. C1 NASA,LANGLEY RES CTR,INST COMP APPLICAT SCI & ENGN,HAMPTON,VA 23665. OLD DOMINION UNIV,DEPT MATH & STAT,NORFOLK,VA 23529. NR 18 TC 3 Z9 3 U1 0 U2 1 PU GORDON BREACH SCI PUBL LTD PI READING PA C/O STBS LTD PO BOX 90, READING, BERKS, ENGLAND RG1 8JL SN 0010-2202 J9 COMBUST SCI TECHNOL JI Combust. Sci. Technol. PY 1993 VL 87 IS 1-6 BP 363 EP 387 DI 10.1080/00102209208947222 PG 25 WC Thermodynamics; Energy & Fuels; Engineering, Multidisciplinary; Engineering, Chemical SC Thermodynamics; Energy & Fuels; Engineering GA LZ035 UT WOS:A1993LZ03500019 ER PT J AU TAN, KH HENNINGER, DL AF TAN, KH HENNINGER, DL TI MINERALOGY, CHEMICAL-COMPOSITION, AND INTERACTION OF LUNAR SIMULANTS WITH HUMIC ACIDS SO COMMUNICATIONS IN SOIL SCIENCE AND PLANT ANALYSIS LA English DT Article ID ALUMINUM AB An investigation was conducted on the mineralogy, chemical composition, and interaction of two NASA lunar simulants, Minnesota basalt and Coming glass, with humic acid (HA). Chemical composition was determined by a fluoro-boric acid digestion process. Mineral composition was investigated by x-ray diffraction analysis (XRD), scanning electron microscopy (SEM), and energy dispersive analysis by x-rays (EDAX). Interaction was studied by shaking samples of the lunar simulants with HA solutions at pH 2.45 and 7.0 for 1 to 40 days. Silica, Fe, and Al released were determined by atomic absorption spectroscopy. Changes in mineral structure and elemental composition of single crystals were examined by SEM and EDAX. Minnesota basalt was composed of approximately 60% plagioclase and 40% ferromagnesian minerals. The presence of ilmenite was detected by SEM and EDAX. Corning glass was amorphous to XRD. The rate and kinetics of dissolution of the two lunar simulants were similar to those reported for soil silicates and carbonate minerals. The release of Si, Al, and Fe was curvi-linear in regression, and the rate of dissolution was greater at low than at high pH. Interaction with HA resulted in crust formation covering the lunar mineral surfaces, which acted as a barrier, slowing down further dissolution with time. The concentrations of the dissolved metals were too small to create toxicity in plants, especially in the presence of HA with its high complexation capacity. If these lunar simulants are considered representative of the real lunar regolith, it is expected that the interaction between lunar minerals and soil organic matter will be similar as that between soil minerals and organic matter. C1 NASA,LYNDON B JOHNSON SPACE CTR,HOUSTON,TX 77058. RP TAN, KH (reprint author), UNIV GEORGIA,DEPT CROP & SOIL SCI,ATHENS,GA 30602, USA. NR 22 TC 2 Z9 2 U1 0 U2 1 PU MARCEL DEKKER INC PI NEW YORK PA 270 MADISON AVE, NEW YORK, NY 10016 SN 0010-3624 J9 COMMUN SOIL SCI PLAN JI Commun. Soil Sci. Plant Anal. PY 1993 VL 24 IS 17-18 BP 2479 EP 2492 DI 10.1080/00103629309368969 PG 14 WC Agronomy; Plant Sciences; Chemistry, Analytical; Soil Science SC Agriculture; Plant Sciences; Chemistry GA MC145 UT WOS:A1993MC14500028 ER PT J AU FEIVESON, AH AF FEIVESON, AH TI PROOF OF PHENOMENON-B SO COMMUNICATIONS IN STATISTICS-THEORY AND METHODS LA English DT Article DE TRIDIAGONAL MATRIX; EIGENVALUES AB In their paper ''Some applications, properties and conjectures for higher order cumulants of a Markovian stepping-stone model', Zheng and Matis make use of a conjecture known as ''Phenomenon B'' regarding the eigenvalues of a tridiagonal matrix having a certain form. While the conjecture was shown to hold for particular cases, it was not proven in general. To supplement the Zheng and Matis paper, a formal proof of Phenomenon B is given here. C1 NASA,LYNDON B JOHNSON SPACE CTR,HOUSTON,TX 77058. NR 1 TC 1 Z9 1 U1 0 U2 0 PU MARCEL DEKKER INC PI NEW YORK PA 270 MADISON AVE, NEW YORK, NY 10016 SN 0361-0926 J9 COMMUN STAT THEORY JI Commun. Stat.-Theory Methods PY 1993 VL 22 IS 12 BP 3321 EP 3326 DI 10.1080/03610929308831218 PG 6 WC Statistics & Probability SC Mathematics GA ML275 UT WOS:A1993ML27500004 ER PT B AU JEDREY, TC REILANDER, RT LEYDA, AL AF JEDREY, TC REILANDER, RT LEYDA, AL GP IEEE COMMUN SOC TI ARMY ADVANCED COMMUNICATIONS TECHNOLOGY SATELLITE (ACTS) MOBILE TERMINAL (AAMT) SO COMMUNICATIONS ON THE MOVE - MILCOM 93: 1993 IEEE MILITARY COMMUNICATIONS CONFERENCE, CONFERENCE RECORD, VOLS 1-3 LA English DT Proceedings Paper CT 1993 IEEE Military Communications Conference (MILCOM 93): Communications on the Move CY OCT 11-14, 1993 CL BOSTON, MA SP IEEE, COMMUN SOC, ARMED FORCES COMMUN & ELECTR ASSOC C1 JET PROP LAB,PASADENA,CA 91109. NR 0 TC 0 Z9 0 U1 0 U2 0 PU I E E E PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 BN 0-7803-0953-7 PY 1993 BP 814 EP 820 PG 7 WC Engineering, Electrical & Electronic; Telecommunications SC Engineering; Telecommunications GA BZ65D UT WOS:A1993BZ65D00153 ER PT B AU BERGMAN, LA MONACOS, S HALLORAN, F GALANIS, J AF BERGMAN, LA MONACOS, S HALLORAN, F GALANIS, J GP IEEE COMMUN SOC TI REAL-TIME AND COMPRESSED VIDEO TECHNIQUES FOR MULTIMEDIA TACTICAL FDDI NETWORKS SO COMMUNICATIONS ON THE MOVE - MILCOM 93: 1993 IEEE MILITARY COMMUNICATIONS CONFERENCE, CONFERENCE RECORD, VOLS 1-3 LA English DT Proceedings Paper CT 1993 IEEE Military Communications Conference (MILCOM 93): Communications on the Move CY OCT 11-14, 1993 CL BOSTON, MA SP IEEE, COMMUN SOC, ARMED FORCES COMMUN & ELECTR ASSOC C1 JET PROP LAB,PASADENA,CA 91109. NR 0 TC 0 Z9 0 U1 0 U2 0 PU I E E E PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 BN 0-7803-0953-7 PY 1993 BP 864 EP 868 PG 5 WC Engineering, Electrical & Electronic; Telecommunications SC Engineering; Telecommunications GA BZ65D UT WOS:A1993BZ65D00162 ER PT S AU OBRIEN, TK SALPEKAR, SA AF OBRIEN, TK SALPEKAR, SA BE Camponeschi, ET TI SCALE EFFECTS ON THE TRANSVERSE TENSILE-STRENGTH OF GRAPHITE-EPOXY COMPOSITES SO COMPOSITE MATERIALS: TESTING AND DESIGN - ELEVENTH VOLUME SE AMERICAN SOCIETY FOR TESTING AND MATERIALS SPECIAL TECHNICAL PUBLICATION LA English DT Proceedings Paper CT 11th Symposium on Composite Materials: Testing and Design CY MAY 04-05, 1992 CL PITTSBURGH, PA SP AMER SOC TESTING & MAT, COMM HIGH MODULUS FIBERS & THEIR COMPOSITES DE COMPOSITE MATERIAL; GRAPHITE EPOXY; TRANSVERSE TENSILE STRENGTH; DELAMINATION; MATRIX CRACK; SCALE LAWS; WEIBULL STATISTICS C1 NASA,LANGLEY RES CTR,USA,RES LAB,VEHICLE STRUCT DIRECTORATE,HAMPTON,VA 23681. NR 0 TC 17 Z9 17 U1 0 U2 2 PU AMERICAN SOCIETY TESTING AND MATERIALS PI W CONSHOHOCKEN PA 100 BARR HARBOR DRIVE, W CONSHOHOCKEN, PA 19428-2959 SN 1071-5827 BN 0-8031-1879-1 J9 AM SOC TEST MATER PY 1993 VL 1206 BP 23 EP 52 PG 30 WC Materials Science, Characterization & Testing; Materials Science, Composites SC Materials Science GA BZ95F UT WOS:A1993BZ95F00002 ER PT S AU CREWS, JH NAIK, RA AF CREWS, JH NAIK, RA BE Camponeschi, ET TI MEASUREMENT OF MULTIAXIAL PLY STRENGTH BY AN OFF-AXIS FLEXURE TEST SO COMPOSITE MATERIALS: TESTING AND DESIGN - ELEVENTH VOLUME SE AMERICAN SOCIETY FOR TESTING AND MATERIALS SPECIAL TECHNICAL PUBLICATION LA English DT Proceedings Paper CT 11th Symposium on Composite Materials: Testing and Design CY MAY 04-05, 1992 CL PITTSBURGH, PA SP AMER SOC TESTING & MAT, COMM HIGH MODULUS FIBERS & THEIR COMPOSITES DE COMPOSITE; PLY STRENGTH; TEST; MULTIAXIAL; OFF-AXIS FLEXURE (OAF) C1 NASA,LANGLEY RES CTR,HAMPTON,VA 23665. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMERICAN SOCIETY TESTING AND MATERIALS PI W CONSHOHOCKEN PA 100 BARR HARBOR DRIVE, W CONSHOHOCKEN, PA 19428-2959 SN 1071-5827 BN 0-8031-1879-1 J9 AM SOC TEST MATER PY 1993 VL 1206 BP 124 EP 135 PG 12 WC Materials Science, Characterization & Testing; Materials Science, Composites SC Materials Science GA BZ95F UT WOS:A1993BZ95F00007 ER PT S AU GATES, TS AF GATES, TS BE Camponeschi, ET TI MATRIX-DOMINATED STRESS-STRAIN BEHAVIOR IN POLYMERIC COMPOSITES - EFFECTS OF HOLD TIME, NONLINEARITY, AND RATE DEPENDENCY SO COMPOSITE MATERIALS: TESTING AND DESIGN - ELEVENTH VOLUME SE AMERICAN SOCIETY FOR TESTING AND MATERIALS SPECIAL TECHNICAL PUBLICATION LA English DT Proceedings Paper CT 11th Symposium on Composite Materials: Testing and Design CY MAY 04-05, 1992 CL PITTSBURGH, PA SP AMER SOC TESTING & MAT, COMM HIGH MODULUS FIBERS & THEIR COMPOSITES DE AGING; MATERIAL NONLINEARITY; CONSTITUTIVE MODEL; ELEVATED TEMPERATURE; STRESS RELAXATION; CREEP; VISCOPLASTICITY C1 NASA,LANGLEY RES CTR,HAMPTON,VA 23681. NR 0 TC 9 Z9 9 U1 0 U2 1 PU AMERICAN SOCIETY TESTING AND MATERIALS PI W CONSHOHOCKEN PA 100 BARR HARBOR DRIVE, W CONSHOHOCKEN, PA 19428-2959 SN 1071-5827 BN 0-8031-1879-1 J9 AM SOC TEST MATER PY 1993 VL 1206 BP 177 EP 189 PG 13 WC Materials Science, Characterization & Testing; Materials Science, Composites SC Materials Science GA BZ95F UT WOS:A1993BZ95F00011 ER PT S AU BARTOLOTTA, PA VERRILLI, MJ AF BARTOLOTTA, PA VERRILLI, MJ BE Camponeschi, ET TI THERMOMECHANICAL FATIGUE BEHAVIOR OF SIC/TI-24AL-11NB [0]8 IN AIR AND ARGON ENVIRONMENTS SO COMPOSITE MATERIALS: TESTING AND DESIGN - ELEVENTH VOLUME SE AMERICAN SOCIETY FOR TESTING AND MATERIALS SPECIAL TECHNICAL PUBLICATION LA English DT Proceedings Paper CT 11th Symposium on Composite Materials: Testing and Design CY MAY 04-05, 1992 CL PITTSBURGH, PA SP AMER SOC TESTING & MAT, COMM HIGH MODULUS FIBERS & THEIR COMPOSITES DE THERMOMECHANICAL FATIGUE (TMF); TITANIUM ALUMINIDE COMPOSITE; ARGON AND AIR ENVIRONMENTS; INTERMETALLIC MATRIX COMPOSITES C1 NASA,LEWIS RES CTR,CLEVELAND,OH 44135. NR 0 TC 2 Z9 2 U1 0 U2 0 PU AMERICAN SOCIETY TESTING AND MATERIALS PI W CONSHOHOCKEN PA 100 BARR HARBOR DRIVE, W CONSHOHOCKEN, PA 19428-2959 SN 1071-5827 BN 0-8031-1879-1 J9 AM SOC TEST MATER PY 1993 VL 1206 BP 190 EP 201 PG 12 WC Materials Science, Characterization & Testing; Materials Science, Composites SC Materials Science GA BZ95F UT WOS:A1993BZ95F00012 ER PT S AU REEDER, JR AF REEDER, JR BE Camponeschi, ET TI A BILINEAR FAILURE CRITERION FOR MIXED-MODE DELAMINATION SO COMPOSITE MATERIALS: TESTING AND DESIGN - ELEVENTH VOLUME SE AMERICAN SOCIETY FOR TESTING AND MATERIALS SPECIAL TECHNICAL PUBLICATION LA English DT Proceedings Paper CT 11th Symposium on Composite Materials: Testing and Design CY MAY 04-05, 1992 CL PITTSBURGH, PA SP AMER SOC TESTING & MAT, COMM HIGH MODULUS FIBERS & THEIR COMPOSITES DE COMPOSITE; MIXED-MODE DELAMINATION; TOUGHNESS TESTING; FAILURE CRITERIA C1 NASA,LANGLEY RES CTR,MECH MAT BRANCH,HAMPTON,VA 23665. NR 0 TC 38 Z9 38 U1 0 U2 2 PU AMERICAN SOCIETY TESTING AND MATERIALS PI W CONSHOHOCKEN PA 100 BARR HARBOR DRIVE, W CONSHOHOCKEN, PA 19428-2959 SN 1071-5827 BN 0-8031-1879-1 J9 AM SOC TEST MATER PY 1993 VL 1206 BP 303 EP 322 PG 20 WC Materials Science, Characterization & Testing; Materials Science, Composites SC Materials Science GA BZ95F UT WOS:A1993BZ95F00020 ER PT S AU JACKSON, WC MARTIN, RH AF JACKSON, WC MARTIN, RH BE Camponeschi, ET TI AN INTERLAMINAR TENSILE-STRENGTH SPECIMEN SO COMPOSITE MATERIALS: TESTING AND DESIGN - ELEVENTH VOLUME SE AMERICAN SOCIETY FOR TESTING AND MATERIALS SPECIAL TECHNICAL PUBLICATION LA English DT Proceedings Paper CT 11th Symposium on Composite Materials: Testing and Design CY MAY 04-05, 1992 CL PITTSBURGH, PA SP AMER SOC TESTING & MAT, COMM HIGH MODULUS FIBERS & THEIR COMPOSITES DE COMPOSITE MATERIAL; CARBON EPOXY; INTERLAMINAR TENSILE STRENGTH; CURVED BEAM; DELAMINATION C1 NASA,LANGLEY RES CTR,USA,AEROSTRUCT DIRECTORATE,HAMPTON,VA 23681. NR 0 TC 15 Z9 15 U1 1 U2 2 PU AMERICAN SOCIETY TESTING AND MATERIALS PI W CONSHOHOCKEN PA 100 BARR HARBOR DRIVE, W CONSHOHOCKEN, PA 19428-2959 SN 1071-5827 BN 0-8031-1879-1 J9 AM SOC TEST MATER PY 1993 VL 1206 BP 333 EP 354 PG 22 WC Materials Science, Characterization & Testing; Materials Science, Composites SC Materials Science GA BZ95F UT WOS:A1993BZ95F00022 ER PT J AU NOOR, AK SHAH, RS AF NOOR, AK SHAH, RS TI EFFECTIVE THERMOELASTIC AND THERMAL-PROPERTIES OF UNIDIRECTIONAL FIBER-REINFORCED COMPOSITES AND THEIR SENSITIVITY COEFFICIENTS SO COMPOSITE STRUCTURES LA English DT Article AB Three-dimensional finite element models are used to assess the accuracy of the thermoelastic and thermal properties of unidirectional fiber-reinforced composites predicted by six different micromechanical models. The six models are: simple mechanics of materials type equations, fiber substructuring model, vanishing fiber diameter model, self-consistent model, Mori-Tanaka model, and method of cells. In addition, the finite element models are used to assess the accuracy of derivatives of the effective properties, with respect to each of the constituent material properties and fiber-volume ratio, computed using the six micromechanical models. The predictions of the micromechanical and finite element models for four advanced composite material systems are compared with experimental data. The results obtained in the present study show that the predictions of the Mori-Tanaka model and the method of cells are closer to those of the finite element models than those of all the other micromechanical models. RP NOOR, AK (reprint author), UNIV VIRGINIA,CTR COMP STRUCT TECHNOL,NASA,LANGLEY RES CTR,HAMPTON,VA 23665, USA. NR 29 TC 37 Z9 38 U1 0 U2 0 PU ELSEVIER SCI LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, OXON, ENGLAND OX5 1GB SN 0263-8223 J9 COMPOS STRUCT JI Compos. Struct. PY 1993 VL 26 IS 1-2 BP 7 EP 23 DI 10.1016/0263-8223(93)90040-W PG 17 WC Materials Science, Composites SC Materials Science GA LQ291 UT WOS:A1993LQ29100002 ER PT J AU KO, WL JACKSON, RH AF KO, WL JACKSON, RH TI COMPRESSIVE AND SHEAR BUCKLING ANALYSIS OF METAL-MATRIX COMPOSITE SANDWICH PANELS UNDER DIFFERENT THERMAL ENVIRONMENTS SO COMPOSITE STRUCTURES LA English DT Article; Proceedings Paper CT 7TH INTERNATIONAL CONF ON COMPOSITE STRUCTURES ( ICCS/7 ) CY JUL, 1993 CL UNIV PAISLEY, PAISLEY, SCOTLAND SP UNIV PAISLEY, SCOTTISH ENTERPRISE, NATL ENGN LAB, USA, EUROPEAN OFF AEROSP RES & DEV, USA, RES DEV & STAND GRP UK, STRATHCLYDE BUSINESS DEV, RENFREW DISTRICT COUNCIL HO UNIV PAISLEY AB Combined inplane compressive and shear buckling analysis was conducted on flat rectangular sandwich panels using the Rayleigh-Ritz minimum energy method with a consideration of transverse shear effect of the sandwich core. The sandwich panels were fabricated with titanium honeycomb core and laminated metal matrix composite face sheets. The results show that slightly slender (along the unidirectional compressive loading axis) rectangular sandwich panels have the most desirable stiffness-to-weight ratios for aerospace structural applications; the degradation of buckling strength sandwich panels with rising temperature is faster in shear than in compression; and the fiber orientation of the face sheets for optimum combined-load buckling strength of sandwich panels is a strong function of both loading condition and panel aspect ratio. Under the same specific weight and panel aspect ratio, a sandwich panel with metal matrix composite face sheets has a much higher buckling strength than one having monolithic face sheets. RP KO, WL (reprint author), NASA,DRYDEN FLIGHT RES FACIL,EDWARDS AFB,CA 93523, USA. NR 8 TC 7 Z9 7 U1 2 U2 4 PU ELSEVIER SCI LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, OXON, ENGLAND OX5 1GB SN 0263-8223 J9 COMPOS STRUCT JI Compos. Struct. PY 1993 VL 25 IS 1-4 BP 227 EP 239 DI 10.1016/0263-8223(93)90169-Q PG 13 WC Materials Science, Composites SC Materials Science GA LL680 UT WOS:A1993LL68000025 ER PT J AU NOOR, AK STARNES, JH PETERS, JM AF NOOR, AK STARNES, JH PETERS, JM TI THERMOMECHANICAL BUCKLING AND POSTBUCKLING OF MULTILAYERED COMPOSITE PANELS SO COMPOSITE STRUCTURES LA English DT Article ID PLATES AB A study is made of the thermomechanical buckling and postbuckling responses of flat unstiffened composite panels. The panels are subjected to combined temperature change and applied edge displacement. The analysis is based on a first-order shear deformation, von-Karman type nonlinear plate theory. A mixed formulation is used with the fundamental unknowns consisting of the generalized displacements and the stress resultants of the plate. An efficient multiple-parameter reduction method is used in conjunction with mixed finite element models, for determining the stability boundary and postbuckling response. The reduction method is also used for evaluating the sensitivity coefficients which measure the sensitivity of the buckling and postbuckling responses to variations in the different lamination and material parameters of the panel. Numerical results are presented showing the effects of variations in the laminate stacking sequence, fiber orientation, number of layers and aspect ratio of the panels on the thermomechanical buckling and postbuckling responses and their sensitivity. C1 NASA,LANGLEY RES CTR,HAMPTON,VA 23681. RP NOOR, AK (reprint author), UNIV VIRGINIA,CTR COMPUTAT STRUCT TECHNOL,MAIL STOP 210,CHARLOTTESVILLE,VA 22903, USA. NR 19 TC 31 Z9 32 U1 0 U2 1 PU ELSEVIER SCI LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, OXON, ENGLAND OX5 1GB SN 0263-8223 J9 COMPOS STRUCT JI Compos. Struct. PY 1993 VL 23 IS 3 BP 233 EP 251 DI 10.1016/0263-8223(93)90225-F PG 19 WC Materials Science, Composites SC Materials Science GA KU453 UT WOS:A1993KU45300005 ER PT J AU BIGELOW, CA AF BIGELOW, CA TI A MICROMECHANICS-BASED STRENGTH PREDICTION METHODOLOGY FOR NOTCHED METAL-MATRIX COMPOSITES SO COMPOSITES LA English DT Article DE METAL-MATRIX COMPOSITES; NOTCHED LAMINATES; STRENGTH PREDICTION; FINITE ELEMENT ANALYSIS; DISCRETE FIBER MATRIX MODEL; MACRO-MICROMECHANICAL ANALYSIS; INTERFACIAL DEBONDING AB An analytical micromechanics-based strength prediction methodology was developed to predict failure of notched metal-matrix composites. The stress/strain behaviour and notched strength of two metal-matrix composites, boron/aluminium (B/Al) and silicon carbide/titanium (SCS-6/Ti-15-3), were predicted. The prediction methodology combines analytical techniques ranging from a three-dimensional finite element analysis of a notched specimen to a micromechanical model of a single fibre. In the B/Al laminates, a fibre failure criterion based on the axial and shear stress in the fibre accurately predicted laminate failure for a variety of lay-ups and notch-length-to-specimen-width ratios with both circular holes and sharp notches when matrix plasticity was included in the analysis. For the SCS-6/Ti-15-3 laminates, a fibre failure criterion based on the axial stress in the fibre correlated well with experimental results for static and post-fatigue residual strengths when fibre/matrix debonding and matrix cracking were included in the analysis. The micromechanics-based strength prediction methodology presented here offers a direct approach to strength prediction by modelling behaviour and damage on a constituent level, thus explicitly including matrix non-linearity, fibre/ matrix interface debonding and matrix cracking. RP BIGELOW, CA (reprint author), NASA,LANGLEY RES CTR,MAIL STOP 188E,HAMPTON,VA 23665, USA. NR 21 TC 2 Z9 2 U1 1 U2 2 PU BUTTERWORTH-HEINEMANN LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, OXON, ENGLAND OX5 1GB SN 0010-4361 J9 COMPOSITES JI Composites PY 1993 VL 24 IS 2 BP 113 EP 121 DI 10.1016/0010-4361(93)90007-U PG 9 WC Materials Science, Composites SC Materials Science GA KL402 UT WOS:A1993KL40200007 ER PT J AU JOHNSON, WS AF JOHNSON, WS TI DAMAGE DEVELOPMENT IN TITANIUM METAL-MATRIX COMPOSITES SUBJECTED TO CYCLIC LOADING SO COMPOSITES LA English DT Article DE METAL-MATRIX COMPOSITES; INTERFACES; STIFFNESS LOSS; FINITE ELEMENT ANALYSIS; RESIDUAL STRENGTH; EFFECTIVE STRAIN; CRACK PROPAGATION ID FIBER COMPOSITES; CRACKING; MECHANICS; FATIGUE AB For several lay-ups of SCS-6/Ti-15-3 composites fatigue tests were conducted and analysed for both notched and unnotched specimens at room and elevated temperatures. Thermomechanical fatigue results were also analysed. Test results indicated that the stress in the 0-degrees fibres is the controlling factor in fatigue life. The static and fatigue strengths of these materials are shown to be strongly dependent on the level of residual stresses and the fibre/matrix interfacial strength. Fatigue tests of notched specimens showed that cracks can initiate and grow many fibre spacings in the matrix material without breaking the fibres. Fibre bridging models were applied to characterize the crack growth behaviour. The matrix cracks are shown to reduce significantly the residual strength of notched composites. The notched strength of these composites was accurately predicted using a micromechanics-based methodology. RP JOHNSON, WS (reprint author), NASA,LANGLEY RES CTR,MS 188E,HAMPTON,VA 23665, USA. NR 22 TC 18 Z9 18 U1 0 U2 2 PU BUTTERWORTH-HEINEMANN LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, OXON, ENGLAND OX5 1GB SN 0010-4361 J9 COMPOSITES JI Composites PY 1993 VL 24 IS 3 BP 187 EP 196 DI 10.1016/0010-4361(93)90163-3 PG 10 WC Materials Science, Composites SC Materials Science GA KL403 UT WOS:A1993KL40300001 ER PT J AU HO, H TSAI, MY MORTON, J FARLEY, GL AF HO, H TSAI, MY MORTON, J FARLEY, GL TI A COMPARISON OF 3 POPULAR TEST METHODS FOR DETERMINING THE SHEAR MODULUS OF COMPOSITE-MATERIALS SO COMPOSITES ENGINEERING LA English DT Article ID UNIDIRECTIONAL COMPOSITES AB Three popular shear tests-the 10-degrees off-axis, the +/-45-degrees tensile and the Iosipescu specimen tested in the modified Wyoming fixture-for shear modulus measurement are evaluated for a graphite-epoxy composite material system. A comparison of the shear stress-strain response for each test method is made using conventional strain gage instrumentation and moire interferometry. The uniformity and purity of the strain fields in the test sections of the specimens are discussed, and the shear responses obtained from each test technique are presented and compared. For accurate Measurement of the shear modulus, the 90-degrees Iosipescu specimen is recommended. C1 NASA,LANGLEY RES CTR,USA,AEROSTRUCT DIRECTORATE,HAMPTON,VA 23665. RP HO, H (reprint author), VIRGINIA POLYTECH INST & STATE UNIV,DEPT ENGN SCI & MECH,BLACKSBURG,VA 24061, USA. NR 20 TC 6 Z9 6 U1 1 U2 3 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0961-9526 J9 COMPOS ENG JI Compos. Eng. PY 1993 VL 3 IS 1 BP 69 EP 81 DI 10.1016/0961-9526(93)90032-F PG 13 WC Engineering, Multidisciplinary; Materials Science, Composites SC Engineering; Materials Science GA JN560 UT WOS:A1993JN56000006 ER PT J AU HUEY, CO FARLEY, GL AF HUEY, CO FARLEY, GL TI DEVELOPMENT OF GENERALIZED 3-D BRAIDING MACHINES FOR COMPOSITE PREFORMS SO COMPOSITES ENGINEERING LA English DT Article AB The operating principles of two prototype braiding machines for the production of generalized braid patterns are described. Both processes afford previously unachievable control of the interlacing of fibers within a textile structure that make them especially amenable to the fabrication of textile preforms for composite materials. They enable independent control of the motion of the individual fibers being woven, thereby enabling the greatest possible freedom in controlling fiber orientation within a structure. This freedom enables the designer to prescribe local fiber orientation to better optimize material performance. The processes have been implemented on a very small scale but at a level that demonstrates their practicality and the soundness of the principles governing their operation. C1 NASA,LANGLEY RES CTR,USA AEROSTRUCT DIRECTORATE,HAMPTON,VA 23665. RP HUEY, CO (reprint author), CLEMSON UNIV,DEPT MECH ENGN,318 RIGGS HALL,CLEMSON,SC 29634, USA. NR 8 TC 0 Z9 0 U1 1 U2 3 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0961-9526 J9 COMPOS ENG JI Compos. Eng. PY 1993 VL 3 IS 3 BP 209 EP 218 DI 10.1016/0961-9526(93)90056-P PG 10 WC Engineering, Multidisciplinary; Materials Science, Composites SC Engineering; Materials Science GA KC927 UT WOS:A1993KC92700002 ER PT J AU NETTLES, AT LANCE, DG AF NETTLES, AT LANCE, DG TI ON THE ENHANCEMENT OF IMPACT DAMAGE TOLERANCE OF COMPOSITE LAMINATES SO COMPOSITES ENGINEERING LA English DT Article ID HYBRID COMPOSITES; POLYETHYLENE AB This paper examines the use of a thin layer of Ultra High Molecular Weight Polyethylene (UHMWPE) on the outer surface of carbon/epoxy composite materials as a method of improving impact resistance and damage tolerance through hybridization. Flat 16-ply laminates as well as honeycomb sandwich structures with eight-ply facesheets were tested in this study. Instrumented drop-weight impact testing was used to inflict damage upon the specimens. Evaluation of damage resistance included instrumented impact data, visual examination, C-scanning and compression after impact (CAI) testing. The results show that only one lamina of UHMWPE did not improve the damage tolerance (strength retention) of the 16-ply flat laminate specimens or the honeycomb sandwich beams, however, a modest gain in impact resistance (detectable damage) was found for the honeycomb sandwich specimens that contained an outer layer of UHMWPE. RP NETTLES, AT (reprint author), NASA,GEORGE C MARSHALL SPACE FLIGHT CTR,COMPOSITES BRANCH,CODE EH33,HUNTSVILLE,AL 35812, USA. NR 10 TC 9 Z9 10 U1 0 U2 4 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0961-9526 J9 COMPOS ENG JI Compos. Eng. PY 1993 VL 3 IS 5 BP 383 EP & DI 10.1016/0961-9526(93)90076-V PG 0 WC Engineering, Multidisciplinary; Materials Science, Composites SC Engineering; Materials Science GA KR488 UT WOS:A1993KR48800001 ER PT J AU FREEMAN, WT AF FREEMAN, WT TI THE USE OF COMPOSITES IN AIRCRAFT PRIMARY STRUCTURE SO COMPOSITES ENGINEERING LA English DT Article AB This paper reviews the current applications of composites to airframes on a variety of aircraft with emphasis on the structures and materials developments that have led to production hardware. Special emphasis is placed on the issues and barriers that impede much greater use of composites in wings and fuselages of large commercial transports. Acquisition and life-cycle cost issues that dominate the decision process for further commitment of composites to primary structure in large aircraft production applications are reviewed. RP FREEMAN, WT (reprint author), NASA,LANGLEY RES CTR,STRUCT TECHNOL PROGRAM OFF,HAMPTON,VA 23681, USA. NR 36 TC 4 Z9 4 U1 0 U2 1 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0961-9526 J9 COMPOS ENG JI Compos. Eng. PY 1993 VL 3 IS 7-8 BP 767 EP 775 DI 10.1016/0961-9526(93)90095-2 PG 9 WC Engineering, Multidisciplinary; Materials Science, Composites SC Engineering; Materials Science GA LM487 UT WOS:A1993LM48700013 ER PT J AU KOURTIDES, DA AF KOURTIDES, DA TI THERMAL PERFORMANCE OF COMPOSITE FLEXIBLE BLANKET INSULATIONS FOR HYPERSONIC AEROSPACE VEHICLES SO COMPOSITES ENGINEERING LA English DT Article AB This paper describes the thermal performance of a Composite Flexible Blanket Insulation (C.F.B.I.) considered for potential use as a thermal protection system or thermal insulation for future hypersonic vehicles such as the National Aerospace Plane (N.A.S.P.). Thermophysical properties for these insulations were also measured including the thermal conductivity at various temperatures and pressures and the emissivity of the fabrics used in the flexible insulations. The thermal response of these materials subjected to aeroconvective heating from a plasma arc is also described. Materials tested included two surface variations of the insulations, and similar insulations coated with a Protective Ceramic Coating (P.C.C.). Surface and backface temperatures were measured in the flexible insulations and on Fibrous Refractory Composite Insulation (F.R.C.I.) used as a calibration model. The uncoated flexible insulations exhibited good thermal performance up to 35 W cm-2. The use of a P.C.C. to protect these insulations at higher heating rates is described. The results from a computerized thermal analysis model describing thermal response of those materials subjected to the plasma arc conditions are included. Thermal and optical properties were determined including thermal conductivity for the rigid and flexible insulations and emissivity for the insulation fabrics. These properties were utilized to calculate the thermal performance of the rigid and flexible insulations at the maximum heating rate. RP KOURTIDES, DA (reprint author), NASA,MOFFETT FIELD,CA 94035, USA. NR 11 TC 2 Z9 2 U1 3 U2 17 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0961-9526 J9 COMPOS ENG JI Compos. Eng. PY 1993 VL 3 IS 7-8 BP 805 EP 813 DI 10.1016/0961-9526(93)90097-4 PG 9 WC Engineering, Multidisciplinary; Materials Science, Composites SC Engineering; Materials Science GA LM487 UT WOS:A1993LM48700015 ER PT J AU HO, H TSAI, MY MORTON, J FARLEY, GL AF HO, H TSAI, MY MORTON, J FARLEY, GL TI NUMERICAL-ANALYSIS OF THE IOSIPESCU SPECIMEN FOR COMPOSITE-MATERIALS SO COMPOSITES SCIENCE AND TECHNOLOGY LA English DT Article DE NUMERICAL ANALYSIS; COMPOSITE MATERIALS; IOSIPESCU SPECIMEN; SHEAR MODULUS; CORRECTION FACTORS ID SHEAR TEST METHOD; UNIDIRECTIONAL COMPOSITES AB A finite element analysis of the Iosipescu shear test for unidirectional and cross-ply composites is presented. It is shown that an iterative analysis procedure must be used to model the fixture-specimen kinematics. The correction factors which are needed to compensate for the non-uniformity of stress distribution in calculating shear modulus are shown to be dependent on the material orthotropy ratio and the finite element loading models. Test section strain distributions representative of typical graphite/epoxy specimen are also presented. C1 USA,AEROSTRUCT DIRECTORATE,NASA,LANGLEY RES CTR,HAMPTON,VA 23665. RP HO, H (reprint author), VIRGINIA POLYTECH INST & STATE UNIV,DEPT ENGN SCI & MECH,BLACKSBURG,VA 24061, USA. NR 20 TC 35 Z9 35 U1 0 U2 1 PU ELSEVIER SCI LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, OXON, ENGLAND OX5 1GB SN 0266-3538 J9 COMPOS SCI TECHNOL JI Compos. Sci. Technol. PY 1993 VL 46 IS 2 BP 115 EP 128 DI 10.1016/0266-3538(93)90167-F PG 14 WC Materials Science, Composites SC Materials Science GA KH947 UT WOS:A1993KH94700003 ER PT B AU BRYAN, K AF BRYAN, K BE Bowers, KL Lund, J TI AN INVERSE PROBLEM IN THERMAL IMAGING SO COMPUTATION AND CONTROL III SE PROGRESS IN SYSTEMS AND CONTROL THEORY LA English DT Proceedings Paper CT 3rd Bozeman Conference on Computation and Control CY AUG 05-11, 1992 CL MONTANA STATE UNIV, BOZEMAN, MT SP MONTANA STATE UNIV, DEPT MATH SCI HO MONTANA STATE UNIV C1 NASA,LANGLEY RES CTR,INST COMP APPLICAT SCI & ENGN,HAMPTON,VA 23681. NR 0 TC 1 Z9 1 U1 0 U2 0 PU BIRKHAUSER BOSTON PI CAMBRIDGE PA 675 MASSACHUSETTS AVE, CAMBRIDGE, MA 02139-2333 BN 0-8176-3656-0 J9 PROG SYST C PY 1993 VL 15 BP 73 EP 82 PG 10 WC Automation & Control Systems; Mathematics, Applied SC Automation & Control Systems; Mathematics GA BA62W UT WOS:A1993BA62W00005 ER PT B AU PELLIONISZ, AJ TOMKO, DL BLOEDEL, JR AF PELLIONISZ, AJ TOMKO, DL BLOEDEL, JR BE Eeckman, FH Bower, JM TI NEURAL GEOMETRY REVEALED BY NEUROCOMPUTER ANALYSIS OF MULTIUNIT RECORDINGS SO COMPUTATION AND NEURAL SYSTEMS LA English DT Proceedings Paper CT 1st Annual Computation and Neural Systems Meeting CY JUL 26-29, 1992 CL SAN FRANCISCO, CA C1 NASA,AMES RES CTR,MOFFETT FIELD,CA 94035. NR 0 TC 0 Z9 0 U1 0 U2 0 PU KLUWER ACADEMIC PUBLISHERS PI NORWELL PA 101 PHILIP DRIVE, ASSINIPPI PARK, NORWELL, MA 02061 BN 0-7923-9349-X PY 1993 BP 67 EP 71 PG 5 WC Computer Science, Artificial Intelligence; Neurosciences SC Computer Science; Neurosciences & Neurology GA BA36B UT WOS:A1993BA36B00011 ER PT J AU KARP, AH MIURA, K SIMON, H AF KARP, AH MIURA, K SIMON, H TI 1992 GORDON BELL PRIZE WINNERS SO COMPUTER LA English DT Article C1 FUJITSU AMER FACIL,COMPUTAT RES DEPT,SAN JOSE,CA. NASA,AMES RES CTR,MOFFETT FIELD,CA 94035. RP KARP, AH (reprint author), HEWLETT PACKARD CO,PALO ALTO,CA 94304, USA. NR 0 TC 4 Z9 4 U1 0 U2 0 PU IEEE COMPUTER SOC PI LOS ALAMITOS PA 10662 LOS VAQUEROS CIRCLE, PO BOX 3014, LOS ALAMITOS, CA 90720-1264 SN 0018-9162 J9 COMPUTER JI Computer PD JAN PY 1993 VL 26 IS 1 BP 77 EP 82 PG 6 WC Computer Science, Hardware & Architecture; Computer Science, Software Engineering SC Computer Science GA KG316 UT WOS:A1993KG31600014 ER PT J AU BAKER, AJ SNYDER, PK ORZECHOWSKI, JA AF BAKER, AJ SNYDER, PK ORZECHOWSKI, JA TI 3-DIMENSIONAL CHARACTERIZATION OF THE NEARFIELD OF A VSTOL JET IN TURBULENT CROSS-FLOW SO COMPUTER METHODS IN APPLIED MECHANICS AND ENGINEERING LA English DT Article AB Laser-doppler anemometry and computational fluid dynamics methods have been combined to characterize the strong interaction nearfield evolution of the steady, subsonic, turbulent three-dimensional external aerodynamic flowfield for a high speed jet issued perpendicular to an imposed crossflow. A parabolic Navier-Stokes CFD solver is employed, utilizing a k-epsilon closure system with algebraic Reynolds stress equation, in concert with porous farfield boundary conditions and a virtual source initialization procedure. The CFD results correlate well with the nearfield LDA data for three-dimensional distributions of mean velocity, and the rms fluctuation velocity components interpolated to turbulent kinetic energy. The CFD results downfield from the strong interaction region predict the vortex roll-up and jet cross-section/deflection/entrainment characterization verified by available mean velocity data. Results are presented for a circular VSTOL jet for jet/crossflow velocity ratios ranging 4 to 8. C1 NASA,AMES RES CTR,MOFFETT FIELD,CA 94035. COMPUTAT MECH CORP,KNOXVILLE,TN. RP BAKER, AJ (reprint author), UNIV TENNESSEE,310 PERKINS HALL,KNOXVILLE,TN 37996, USA. NR 8 TC 0 Z9 0 U1 0 U2 0 PU ELSEVIER SCIENCE SA LAUSANNE PI LAUSANNE 1 PA PO BOX 564, 1001 LAUSANNE 1, SWITZERLAND SN 0045-7825 J9 COMPUT METHOD APPL M JI Comput. Meth. Appl. Mech. Eng. PD JAN PY 1993 VL 102 IS 1 BP 1 EP 13 DI 10.1016/0045-7825(93)90137-M PG 13 WC Engineering, Multidisciplinary; Mathematics, Interdisciplinary Applications; Mechanics SC Engineering; Mathematics; Mechanics GA KH203 UT WOS:A1993KH20300001 ER PT J AU JIANG, BN POVINELLI, LA AF JIANG, BN POVINELLI, LA TI OPTIMAL LEAST-SQUARES FINITE-ELEMENT METHOD FOR ELLIPTIC PROBLEMS SO COMPUTER METHODS IN APPLIED MECHANICS AND ENGINEERING LA English DT Article AB In this paper, we propose an optimal least-squares finite element method for 2D and 3D elliptic problems and discuss its advantages over the mixed Galerkin method and the usual least-squares finite element method. In the usual least-squares finite element method, the second-order equation, -del . (delu) + u = f, is recast as a first-order system, -del . p + u = f, delu - p = 0. Our error analysis and numerical experiments show that, in this usual least-squares finite element method, the rate of convergence for flux p is one-order lower than optimal. In order to get an optimal least-squares method, the irrotationality del x p = 0 should be included in the first-order system. C1 NASA,LEWIS RES CTR,INT FLUID MECH DIV,CLEVELAND,OH 44135. NASA,LEWIS RES CTR,INST COMPUTAT MECH PROP,CLEVELAND,OH 44135. NR 10 TC 39 Z9 39 U1 0 U2 2 PU ELSEVIER SCIENCE SA LAUSANNE PI LAUSANNE 1 PA PO BOX 564, 1001 LAUSANNE 1, SWITZERLAND SN 0045-7825 J9 COMPUT METHOD APPL M JI Comput. Meth. Appl. Mech. Eng. PD JAN PY 1993 VL 102 IS 2 BP 199 EP 212 DI 10.1016/0045-7825(93)90108-A PG 14 WC Engineering, Multidisciplinary; Mathematics, Interdisciplinary Applications; Mechanics SC Engineering; Mathematics; Mechanics GA KJ238 UT WOS:A1993KJ23800003 ER PT J AU GHOSH, S HOSSAIN, M MATTHAEUS, WH AF GHOSH, S HOSSAIN, M MATTHAEUS, WH TI THE APPLICATION OF SPECTRAL METHODS IN SIMULATING COMPRESSIBLE FLUID AND MAGNETOFLUID TURBULENCE SO COMPUTER PHYSICS COMMUNICATIONS LA English DT Article ID SOLAR-WIND FLUCTUATIONS; NUMERICAL-SIMULATION; INCOMPRESSIBLE MAGNETOHYDRODYNAMICS; DISRUPTIONS; ALGORITHM; HELICITY; FLOWS AB We consider the requirements a computational method must meet for the simulation of compressible hydrodynamic and magnetohydrodynamic (MHD) turbulence. After reviewing the properties which make spectral (Galerkin) and pseudospectral methods particularly useful for incompressible turbulence simulations, we consider how well these methods carry over to the compressible case. Major obstacles exist in formulating algorithms using the Galerkin method. In spite of the presence of aliasing errors, the pseudospectral method can be used to write algorithms that conserve a number of important global quantities. Accordingly, we suggest pseudospectral forms for a polytropic MHD model. Finally, a pseudospectral algorithm for the ideal gas MHD model is suggested. This algorithm conserves energy in terms of the dynamical fluid variables and not, as is common practice, due to a separate energy equation written in conservative form. C1 UNIV DELAWARE, BARTOL RES INST, NEWARK, DE 19716 USA. RP NASA, GODDARD SPACE FLIGHT CTR, UNIV SPACE RES ASSOC, GREENBELT, MD 20771 USA. RI Hossain, Murshed/A-9612-2008 OI Hossain, Murshed/0000-0001-7996-9233 NR 46 TC 47 Z9 47 U1 1 U2 3 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0010-4655 EI 1879-2944 J9 COMPUT PHYS COMMUN JI Comput. Phys. Commun. PD JAN PY 1993 VL 74 IS 1 BP 18 EP 40 DI 10.1016/0010-4655(93)90103-J PG 23 WC Computer Science, Interdisciplinary Applications; Physics, Mathematical SC Computer Science; Physics GA KJ657 UT WOS:A1993KJ65700003 ER PT B AU BUSHNELL, DM AF BUSHNELL, DM BE Nakayama, W Yang, KT TI IMPACTS OF MASSIVE PARALLELISM UPON FORCED-CONVECTION HEAT-TRANSFER COMPUTATIONS SO COMPUTERS AND COMPUTING IN HEAT TRANSFER SCIENCE AND ENGINEERING LA English DT Proceedings Paper CT Japan/US Science Seminar: Computers and Computing in Heat Transfer Science and Engineering CY OCT 20-25, 1991 CL OISO, JAPAN SP JAPAN SOC PROMOT SCI, US NAT SCI FDN, KANAGAWA ACAD SCI & TECHNOL C1 NASA,LANGLEY RES CTR,HAMPTON,VA 23665. NR 0 TC 0 Z9 0 U1 0 U2 0 PU CRC PRESS INC PI BOCA RATON PA 2000 CORPORATE BLVD NW, BOCA RATON, FL 33431 BN 0-8493-9935-1 PY 1993 BP 373 EP 389 PG 17 WC Computer Science, Interdisciplinary Applications; Engineering, Mechanical SC Computer Science; Engineering GA BA83D UT WOS:A1993BA83D00024 ER PT J AU BOY, GA AF BOY, GA TI INTEGRATED HUMAN-MACHINE INTELLIGENCE SO COMPUTERS & CHEMICAL ENGINEERING LA English DT Article; Proceedings Paper CT EUROPEAN SYMP ON COMPUTER AIDED PROCESS ENGINEERING - 2 ( ESCAPE - 2 ) CY OCT 05-07, 1992 CL TOULOUSE, FRANCE SP EUROPEAN FEDERAT CHEM ENGINEERS, WORKING PARTY COMPUT AIDED PROC ENGINEERS DE ARTIFICIAL INTELLIGENCE; AEROSPACE SYSTEMS; HUMAN-MACHINE SYSTEMS AB This paper presents an artificial intelligence approach to integrated human-machine intelligence in space systems. It discusses the motivations for Intelligent Assistant Systems in both nominal and abnormal situations. The problem of constructing procedures is shown to be a very critical issue. In particular, keeping procedural experience in both design and operation is critical. We suggest what artificial intelligence can offer in this direction. Some crucial problems induced by this approach are discussed in detail.'Finally, we analyze the various roles that would be shared by both astronauts, ground operators, and the intelligent assistant system. C1 NASA,AMES RES CTR,ARTIFICIAL INTELLIGENCE RES BRANCH,MOFFETT FIELD,CA 94035. RP BOY, GA (reprint author), EURISCO,ONERA,PROLOGUE 1,BP 27-25,F-31312 LABEGE,FRANCE. NR 27 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 0098-1354 J9 COMPUT CHEM ENG JI Comput. Chem. Eng. PY 1993 VL 17 SU S BP S395 EP S404 DI 10.1016/0098-1354(93)85058-T PG 10 WC Computer Science, Interdisciplinary Applications; Engineering, Chemical SC Computer Science; Engineering GA KJ225 UT WOS:A1993KJ22500057 ER PT J AU DAVIS, GJ AF DAVIS, GJ BE Tarter, ME Lock, MD TI NASA UNIQUE CHALLENGES IN SOFTWARE ENGINEERING SO COMPUTING SCIENCE AND STATISTICS, VOL 25: STATISTICAL APPLICATIONS OF EXPANDING COMPUTER CAPABILITIES LA English DT Proceedings Paper CT 25th Symposium on the Interface of Computing Science and Statistics - Statistical Applications of Expanding Computer Capabilities CY APR 14-17, 1993 CL SAN DIEGO, CA SP INTERFACE FDN N AMER, NATL SECUR AGCY, NIH, SAS INST C1 NASA,AMES RES CTR,SPACECRAFT DATA SYST RES BRANCH,MOFFETT FIELD,CA 94035. NR 0 TC 0 Z9 0 U1 0 U2 0 PU INTERFACE FOUNDATION NORTH AMERICA PI FAIRFAX PA PO BOX 7460, FAIRFAX, VA 22039-7460 PY 1993 BP 188 EP 194 PG 7 WC Computer Science, Theory & Methods; Statistics & Probability SC Computer Science; Mathematics GA BB70B UT WOS:A1993BB70B00028 ER PT B AU SATORIUS, EH MULLIGAN, JJ LAY, NE AF SATORIUS, EH MULLIGAN, JJ LAY, NE BE Singh, A TI NEW CRITERIA FOR BLIND ADAPTIVE ARRAYS SO CONFERENCE RECORD OF THE TWENTY-SEVENTH ASILOMAR CONFERENCE ON SIGNALS, SYSTEMS & COMPUTERS, VOLS 1 AND 2 LA English DT Proceedings Paper CT 27th Asilomar Conference on Signals, Systems and Computers CY NOV 01-03, 1993 CL PACIFIC GROVE, CA SP NAVAL POSTGRAD SCH, SAN JOSE STATE UNIV, IEEE SIGNAL PROC SOC, IEEE COMP SOC C1 JET PROP LAB,PASADENA,CA 91109. NR 0 TC 0 Z9 0 U1 0 U2 0 PU I E E E, COMPUTER SOC PRESS PI LOS ALAMITOS PA 10662 LOS VAQUEROS CIRCLE, LOS ALAMITOS, CA 90720 BN 0-8186-4120-7 PY 1993 BP 633 EP 637 PG 5 WC Computer Science, Artificial Intelligence; Engineering, Electrical & Electronic SC Computer Science; Engineering GA BA17F UT WOS:A1993BA17F00125 ER PT B AU FLANAGAN, MJ ZIMMERMAN, GA AF FLANAGAN, MJ ZIMMERMAN, GA BE Singh, A TI SPUR-REDUCED DIGITAL SINUSOID GENERATION USING HIGHER-ORDER PHASE DITHERING SO CONFERENCE RECORD OF THE TWENTY-SEVENTH ASILOMAR CONFERENCE ON SIGNALS, SYSTEMS & COMPUTERS, VOLS 1 AND 2 LA English DT Proceedings Paper CT 27th Asilomar Conference on Signals, Systems and Computers CY NOV 01-03, 1993 CL PACIFIC GROVE, CA SP NAVAL POSTGRAD SCH, SAN JOSE STATE UNIV, IEEE SIGNAL PROC SOC, IEEE COMP SOC C1 JET PROP LAB,DEPT ELECT ENGN,PASADENA,CA 91109. NR 0 TC 0 Z9 0 U1 0 U2 0 PU I E E E, COMPUTER SOC PRESS PI LOS ALAMITOS PA 10662 LOS VAQUEROS CIRCLE, LOS ALAMITOS, CA 90720 BN 0-8186-4120-7 PY 1993 BP 826 EP 830 PG 5 WC Computer Science, Artificial Intelligence; Engineering, Electrical & Electronic SC Computer Science; Engineering GA BA17F UT WOS:A1993BA17F00164 ER PT B AU CHUANG, SL DOUBEK, SE HAINES, RF AF CHUANG, SL DOUBEK, SE HAINES, RF BE Singh, A TI BANDWIDTH CHARACTERISTICS OF MULTIMEDIA DATA TRAFFIC ON A LOCAL-AREA NETWORK SO CONFERENCE RECORD OF THE TWENTY-SEVENTH ASILOMAR CONFERENCE ON SIGNALS, SYSTEMS & COMPUTERS, VOLS 1 AND 2 LA English DT Proceedings Paper CT 27th Asilomar Conference on Signals, Systems and Computers CY NOV 01-03, 1993 CL PACIFIC GROVE, CA SP NAVAL POSTGRAD SCH, SAN JOSE STATE UNIV, IEEE SIGNAL PROC SOC, IEEE COMP SOC C1 NASA,AMES RES CTR,MOFFETT FIELD,CA 94035. NR 0 TC 0 Z9 0 U1 0 U2 0 PU I E E E, COMPUTER SOC PRESS PI LOS ALAMITOS PA 10662 LOS VAQUEROS CIRCLE, LOS ALAMITOS, CA 90720 BN 0-8186-4120-7 PY 1993 BP 836 EP 840 PG 5 WC Computer Science, Artificial Intelligence; Engineering, Electrical & Electronic SC Computer Science; Engineering GA BA17F UT WOS:A1993BA17F00166 ER PT B AU PETILLI, SG AF PETILLI, SG BE Singh, A TI IMAGE COMPRESSION WITH FULL WAVELET TRANSFORM (FWT) AND VECTOR QUANTIZATION SO CONFERENCE RECORD OF THE TWENTY-SEVENTH ASILOMAR CONFERENCE ON SIGNALS, SYSTEMS & COMPUTERS, VOLS 1 AND 2 LA English DT Proceedings Paper CT 27th Asilomar Conference on Signals, Systems and Computers CY NOV 01-03, 1993 CL PACIFIC GROVE, CA SP NAVAL POSTGRAD SCH, SAN JOSE STATE UNIV, IEEE SIGNAL PROC SOC, IEEE COMP SOC C1 JET PROP LAB,PASADENA,CA 91109. NR 0 TC 0 Z9 0 U1 0 U2 0 PU I E E E, COMPUTER SOC PRESS PI LOS ALAMITOS PA 10662 LOS VAQUEROS CIRCLE, LOS ALAMITOS, CA 90720 BN 0-8186-4120-7 PY 1993 BP 906 EP 910 PG 5 WC Computer Science, Artificial Intelligence; Engineering, Electrical & Electronic SC Computer Science; Engineering GA BA17F UT WOS:A1993BA17F00180 ER PT B AU MULLIGAN, JB AF MULLIGAN, JB BE Singh, A TI IMPROVING DIGITAL HALF-TONES BY EXPLOITING VISUAL-SYSTEM PROPERTIES SO CONFERENCE RECORD OF THE TWENTY-SEVENTH ASILOMAR CONFERENCE ON SIGNALS, SYSTEMS & COMPUTERS, VOLS 1 AND 2 LA English DT Proceedings Paper CT 27th Asilomar Conference on Signals, Systems and Computers CY NOV 01-03, 1993 CL PACIFIC GROVE, CA SP NAVAL POSTGRAD SCH, SAN JOSE STATE UNIV, IEEE SIGNAL PROC SOC, IEEE COMP SOC C1 NASA,AMES RES CTR,MOFFETT FIELD,CA 94035. NR 0 TC 0 Z9 0 U1 0 U2 0 PU I E E E, COMPUTER SOC PRESS PI LOS ALAMITOS PA 10662 LOS VAQUEROS CIRCLE, LOS ALAMITOS, CA 90720 BN 0-8186-4120-7 PY 1993 BP 961 EP 965 PG 5 WC Computer Science, Artificial Intelligence; Engineering, Electrical & Electronic SC Computer Science; Engineering GA BA17F UT WOS:A1993BA17F00191 ER PT S AU STELLA, PM KURLAND, RM AF STELLA, PM KURLAND, RM GP IEEE TI THIN-FILM GAAS FOR SPACE - MOVING OUT OF THE LABORATORY SO CONFERENCE RECORD OF THE TWENTY THIRD IEEE PHOTOVOLTAIC SPECIALISTS CONFERENCE - 1993 SE IEEE PHOTOVOLTAIC SPECIALISTS CONFERENCE LA English DT Proceedings Paper CT 23rd IEEE Photovoltaic Specialists Conference CY MAY 10-14, 1993 CL LOUISVILLE, KY SP IEEE, ELECTRON DEVICES SOC C1 JET PROP LAB,PASADENA,CA 91109. NR 0 TC 2 Z9 2 U1 0 U2 0 PU I E E E PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 SN 0160-8371 BN 0-7803-1221-X J9 IEEE PHOT SPEC CONF PY 1993 BP 21 EP 26 DI 10.1109/PVSC.1993.347084 PG 6 WC Engineering, Electrical & Electronic; Optics SC Engineering; Optics GA BZ85T UT WOS:A1993BZ85T00004 ER PT S AU ONG, TP BURGER, D LEWIS, CR CAMPBELL, BD BALDASARO, PF AF ONG, TP BURGER, D LEWIS, CR CAMPBELL, BD BALDASARO, PF GP IEEE TI CALCULATED PERFORMANCE OF INAS THERMOVOLTAIC CELLS SO CONFERENCE RECORD OF THE TWENTY THIRD IEEE PHOTOVOLTAIC SPECIALISTS CONFERENCE - 1993 SE IEEE PHOTOVOLTAIC SPECIALISTS CONFERENCE LA English DT Proceedings Paper CT 23rd IEEE Photovoltaic Specialists Conference CY MAY 10-14, 1993 CL LOUISVILLE, KY SP IEEE, ELECTRON DEVICES SOC C1 JET PROP LAB,PASADENA,CA 91109. NR 0 TC 0 Z9 0 U1 0 U2 0 PU I E E E PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 SN 0160-8371 BN 0-7803-1221-X J9 IEEE PHOT SPEC CONF PY 1993 BP 705 EP 707 DI 10.1109/PVSC.1993.347005 PG 3 WC Engineering, Electrical & Electronic; Optics SC Engineering; Optics GA BZ85T UT WOS:A1993BZ85T00130 ER PT S AU FAUR, M FAUR, M GHALLA, M BAILEY, S MATEESCU, G VOLJIN, V AF FAUR, M FAUR, M GHALLA, M BAILEY, S MATEESCU, G VOLJIN, V GP IEEE TI HIGH-RESOLUTION ETCHANTS AND ELECTROLYTES FOR ACCURATE REVEALING OF SURFACE AND DEEP DISLOCATIONS AND PRECIPITATES IN INP STRUCTURES SO CONFERENCE RECORD OF THE TWENTY THIRD IEEE PHOTOVOLTAIC SPECIALISTS CONFERENCE - 1993 SE IEEE PHOTOVOLTAIC SPECIALISTS CONFERENCE LA English DT Proceedings Paper CT 23rd IEEE Photovoltaic Specialists Conference CY MAY 10-14, 1993 CL LOUISVILLE, KY SP IEEE, ELECTRON DEVICES SOC C1 NASA,LEWIS RES CTR,CLEVELAND,OH 44135. NR 0 TC 0 Z9 0 U1 0 U2 0 PU I E E E PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 SN 0160-8371 BN 0-7803-1221-X J9 IEEE PHOT SPEC CONF PY 1993 BP 747 EP 751 DI 10.1109/PVSC.1993.346997 PG 5 WC Engineering, Electrical & Electronic; Optics SC Engineering; Optics GA BZ85T UT WOS:A1993BZ85T00138 ER PT S AU JAIN, RK LANDIS, GA WILT, DM FLOOD, DJ AF JAIN, RK LANDIS, GA WILT, DM FLOOD, DJ GP IEEE TI LATTICE-MISMATCHED IN0.40AL0.60AS WINDOW LAYERS FOR INDIUM-PHOSPHIDE SOLAR-CELLS SO CONFERENCE RECORD OF THE TWENTY THIRD IEEE PHOTOVOLTAIC SPECIALISTS CONFERENCE - 1993 SE IEEE PHOTOVOLTAIC SPECIALISTS CONFERENCE LA English DT Proceedings Paper CT 23rd IEEE Photovoltaic Specialists Conference CY MAY 10-14, 1993 CL LOUISVILLE, KY SP IEEE, ELECTRON DEVICES SOC C1 NASA,LEWIS RES CTR,CLEVELAND,OH 44135. NR 0 TC 0 Z9 0 U1 0 U2 0 PU I E E E PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 SN 0160-8371 BN 0-7803-1221-X J9 IEEE PHOT SPEC CONF PY 1993 BP 757 EP 762 DI 10.1109/PVSC.1993.346995 PG 6 WC Engineering, Electrical & Electronic; Optics SC Engineering; Optics GA BZ85T UT WOS:A1993BZ85T00140 ER PT S AU WEIZER, VG FATEMI, NS KORENYIBOTH, AL AF WEIZER, VG FATEMI, NS KORENYIBOTH, AL GP IEEE TI NONDESTRUCTIVE, ULTRA-LOW RESISTANCE, THERMALLY STABLE CONTACTS FOR USE ON SHALLOW JUNCTION INP SOLAR-CELLS SO CONFERENCE RECORD OF THE TWENTY THIRD IEEE PHOTOVOLTAIC SPECIALISTS CONFERENCE - 1993 SE IEEE PHOTOVOLTAIC SPECIALISTS CONFERENCE LA English DT Proceedings Paper CT 23rd IEEE Photovoltaic Specialists Conference CY MAY 10-14, 1993 CL LOUISVILLE, KY SP IEEE, ELECTRON DEVICES SOC C1 NASA,LEWIS RES CTR,CLEVELAND,OH 44135. NR 0 TC 0 Z9 0 U1 0 U2 0 PU I E E E PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 SN 0160-8371 BN 0-7803-1221-X J9 IEEE PHOT SPEC CONF PY 1993 BP 779 EP 782 DI 10.1109/PVSC.1993.347123 PG 4 WC Engineering, Electrical & Electronic; Optics SC Engineering; Optics GA BZ85T UT WOS:A1993BZ85T00144 ER PT S AU BAILEY, SG WILT, DM DEANGELO, FL CLARK, EB AF BAILEY, SG WILT, DM DEANGELO, FL CLARK, EB GP IEEE TI PREFERENTIALLY ETCHED EPITAXIAL LIFTOFF OF INDIUM-PHOSPHIDE SO CONFERENCE RECORD OF THE TWENTY THIRD IEEE PHOTOVOLTAIC SPECIALISTS CONFERENCE - 1993 SE IEEE PHOTOVOLTAIC SPECIALISTS CONFERENCE LA English DT Proceedings Paper CT 23rd IEEE Photovoltaic Specialists Conference CY MAY 10-14, 1993 CL LOUISVILLE, KY SP IEEE, ELECTRON DEVICES SOC C1 NASA,LEWIS RES CTR,CLEVELAND,OH 44135. NR 0 TC 2 Z9 2 U1 0 U2 0 PU I E E E PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 SN 0160-8371 BN 0-7803-1221-X J9 IEEE PHOT SPEC CONF PY 1993 BP 783 EP 785 DI 10.1109/PVSC.1993.347122 PG 3 WC Engineering, Electrical & Electronic; Optics SC Engineering; Optics GA BZ85T UT WOS:A1993BZ85T00145 ER PT S AU RYBICKI, GC WILLIAMS, WS AF RYBICKI, GC WILLIAMS, WS GP IEEE TI PROTON IRRADIATION-INDUCED DEFECTS IN CD AND ZN DOPED INP SO CONFERENCE RECORD OF THE TWENTY THIRD IEEE PHOTOVOLTAIC SPECIALISTS CONFERENCE - 1993 SE IEEE PHOTOVOLTAIC SPECIALISTS CONFERENCE LA English DT Proceedings Paper CT 23rd IEEE Photovoltaic Specialists Conference CY MAY 10-14, 1993 CL LOUISVILLE, KY SP IEEE, ELECTRON DEVICES SOC C1 NASA,LEWIS RES CTR,PHOTOVOLTAICS BRANCH,CLEVELAND,OH 44135. NR 0 TC 0 Z9 0 U1 0 U2 0 PU I E E E PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 SN 0160-8371 BN 0-7803-1221-X J9 IEEE PHOT SPEC CONF PY 1993 BP 786 EP 789 DI 10.1109/PVSC.1993.347121 PG 4 WC Engineering, Electrical & Electronic; Optics SC Engineering; Optics GA BZ85T UT WOS:A1993BZ85T00146 ER PT S AU PISZCZOR, MF ONEILL, MJ FRAAS, LM AF PISZCZOR, MF ONEILL, MJ FRAAS, LM GP IEEE TI A NOVEL SPACE PHOTOVOLTAIC MODULE USING A LINEAR FRESNEL LENS AND A LINE-FOCUS TANDEM CELL RECEIVER SO CONFERENCE RECORD OF THE TWENTY THIRD IEEE PHOTOVOLTAIC SPECIALISTS CONFERENCE - 1993 SE IEEE PHOTOVOLTAIC SPECIALISTS CONFERENCE LA English DT Proceedings Paper CT 23rd IEEE Photovoltaic Specialists Conference CY MAY 10-14, 1993 CL LOUISVILLE, KY SP IEEE, ELECTRON DEVICES SOC C1 NASA,LEWIS RES CTR,CLEVELAND,OH 44135. NR 0 TC 2 Z9 2 U1 0 U2 0 PU I E E E PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 SN 0160-8371 BN 0-7803-1221-X J9 IEEE PHOT SPEC CONF PY 1993 BP 1386 EP 1391 DI 10.1109/PVSC.1993.346914 PG 6 WC Engineering, Electrical & Electronic; Optics SC Engineering; Optics GA BZ85T UT WOS:A1993BZ85T00259 ER PT S AU PISZCZOR, MF GESSERT, TA PEARSALL, NM GOODBODY, C AF PISZCZOR, MF GESSERT, TA PEARSALL, NM GOODBODY, C GP IEEE TI A COMPARISON OF THE PERFORMANCE OF ITO/INP CELLS FLOWN ON THE UOSAT-5 FLIGHT EXPERIMENT SO CONFERENCE RECORD OF THE TWENTY THIRD IEEE PHOTOVOLTAIC SPECIALISTS CONFERENCE - 1993 SE IEEE PHOTOVOLTAIC SPECIALISTS CONFERENCE LA English DT Proceedings Paper CT 23rd IEEE Photovoltaic Specialists Conference CY MAY 10-14, 1993 CL LOUISVILLE, KY SP IEEE, ELECTRON DEVICES SOC C1 NASA,LEWIS RES CTR,CLEVELAND,OH 44135. NR 0 TC 0 Z9 0 U1 0 U2 0 PU I E E E PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 SN 0160-8371 BN 0-7803-1221-X J9 IEEE PHOT SPEC CONF PY 1993 BP 1479 EP 1482 DI 10.1109/PVSC.1993.346898 PG 4 WC Engineering, Electrical & Electronic; Optics SC Engineering; Optics GA BZ85T UT WOS:A1993BZ85T00276 ER PT S AU WEINBERG, I JAIN, RK SWARTZ, CK CURTIS, HB BRINKER, DJ VARGASABURTO, C DREVINSKY, PJ AF WEINBERG, I JAIN, RK SWARTZ, CK CURTIS, HB BRINKER, DJ VARGASABURTO, C DREVINSKY, PJ GP IEEE TI PROTON-IRRADIATED HETEROEPITAXIAL INP SOLAR-CELLS SO CONFERENCE RECORD OF THE TWENTY THIRD IEEE PHOTOVOLTAIC SPECIALISTS CONFERENCE - 1993 SE IEEE PHOTOVOLTAIC SPECIALISTS CONFERENCE LA English DT Proceedings Paper CT 23rd IEEE Photovoltaic Specialists Conference CY MAY 10-14, 1993 CL LOUISVILLE, KY SP IEEE, ELECTRON DEVICES SOC C1 NASA,LEWIS RES CTR,CLEVELAND,OH 44135. NR 0 TC 0 Z9 0 U1 0 U2 1 PU I E E E PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 SN 0160-8371 BN 0-7803-1221-X J9 IEEE PHOT SPEC CONF PY 1993 BP 1483 EP 1486 DI 10.1109/PVSC.1993.346897 PG 4 WC Engineering, Electrical & Electronic; Optics SC Engineering; Optics GA BZ85T UT WOS:A1993BZ85T00277 ER PT B AU LEMMERMAN, LA HARVEY, DG AF LEMMERMAN, LA HARVEY, DG BE Hofmeister, WH Schiffman, R TI CONTAINERLESS PROCESSING IN MICROGRAVITY - (THE MODULAR CONTAINERLESS PROCESSING FACILITY - MCPF) SO CONTAINERLESS PROCESSING: TECHNIQUES AND APPLICATIONS LA English DT Proceedings Paper CT 5th International Symposium on Experimental Methods for Materials Science Research, at the Annual Meeting of The Minerals-Metals-and-Materials-Society CY FEB 22-24, 1993 CL DENVER, CO SP MINERALS MET & MAT SOC, ASM MSD, THERMODYNAM & PHASE EQUILIBRIA COMM C1 JET PROP LAB,PASADENA,CA 91109. NR 0 TC 0 Z9 0 U1 0 U2 0 PU MINERALS, METALS & MATERIALS SOC PI WARRENDALE PA 420 COMMONWEALTH DR, WARRENDALE, PA 15086 BN 0-87339-202-7 PY 1993 BP 17 EP 25 PG 9 WC Materials Science, Characterization & Testing SC Materials Science GA BA39Y UT WOS:A1993BA39Y00002 ER PT B AU RHIM, WK CHUNG, SK BARBER, D MAN, KF GUTT, G RULISON, A SPJUT, RE AF RHIM, WK CHUNG, SK BARBER, D MAN, KF GUTT, G RULISON, A SPJUT, RE BE Hofmeister, WH Schiffman, R TI A HIGH-TEMPERATURE ELECTROSTATIC LEVITATOR FOR 1-G SO CONTAINERLESS PROCESSING: TECHNIQUES AND APPLICATIONS LA English DT Proceedings Paper CT 5th International Symposium on Experimental Methods for Materials Science Research, at the Annual Meeting of The Minerals-Metals-and-Materials-Society CY FEB 22-24, 1993 CL DENVER, CO SP MINERALS MET & MAT SOC, ASM MSD, THERMODYNAM & PHASE EQUILIBRIA COMM C1 JET PROP LAB,PASADENA,CA 91109. NR 0 TC 2 Z9 2 U1 0 U2 0 PU MINERALS, METALS & MATERIALS SOC PI WARRENDALE PA 420 COMMONWEALTH DR, WARRENDALE, PA 15086 BN 0-87339-202-7 PY 1993 BP 27 EP 34 PG 8 WC Materials Science, Characterization & Testing SC Materials Science GA BA39Y UT WOS:A1993BA39Y00003 ER PT B AU BISWAS, A OHSAKA, K TRINH, EH AF BISWAS, A OHSAKA, K TRINH, EH BE Hofmeister, WH Schiffman, R TI LASER SPECTROSCOPY DIAGNOSTICS FOR CONTAINERLESS PROCESSING SO CONTAINERLESS PROCESSING: TECHNIQUES AND APPLICATIONS LA English DT Proceedings Paper CT 5th International Symposium on Experimental Methods for Materials Science Research, at the Annual Meeting of The Minerals-Metals-and-Materials-Society CY FEB 22-24, 1993 CL DENVER, CO SP MINERALS MET & MAT SOC, ASM MSD, THERMODYNAM & PHASE EQUILIBRIA COMM C1 JET PROP LAB,MICROGRAV RES GRP MS 183-401,PASADENA,CA 91109. NR 0 TC 1 Z9 1 U1 0 U2 0 PU MINERALS, METALS & MATERIALS SOC PI WARRENDALE PA 420 COMMONWEALTH DR, WARRENDALE, PA 15086 BN 0-87339-202-7 PY 1993 BP 71 EP 75 PG 5 WC Materials Science, Characterization & Testing SC Materials Science GA BA39Y UT WOS:A1993BA39Y00010 ER PT B AU SHARMA, PK TRINH, EH MAN, KF AF SHARMA, PK TRINH, EH MAN, KF BE Hofmeister, WH Schiffman, R TI CONTAINERLESS PROCESSING OF MOLTEN TIN SAMPLES IN A CONTROLLED OXYGEN ENVIRONMENT SO CONTAINERLESS PROCESSING: TECHNIQUES AND APPLICATIONS LA English DT Proceedings Paper CT 5th International Symposium on Experimental Methods for Materials Science Research, at the Annual Meeting of The Minerals-Metals-and-Materials-Society CY FEB 22-24, 1993 CL DENVER, CO SP MINERALS MET & MAT SOC, ASM MSD, THERMODYNAM & PHASE EQUILIBRIA COMM C1 JET PROP LAB,PASADENA,CA 91109. NR 0 TC 0 Z9 0 U1 0 U2 0 PU MINERALS, METALS & MATERIALS SOC PI WARRENDALE PA 420 COMMONWEALTH DR, WARRENDALE, PA 15086 BN 0-87339-202-7 PY 1993 BP 101 EP 106 PG 6 WC Materials Science, Characterization & Testing SC Materials Science GA BA39Y UT WOS:A1993BA39Y00014 ER PT J AU SMIALEK, JL AF SMIALEK, JL TI OXIDATION BEHAVIOR OF TIAL3 COATINGS AND ALLOYS SO CORROSION SCIENCE LA English DT Article; Proceedings Paper CT International Conference to Mark the 20th Anniversary of the UMIST Corrosion-and-Protection-Centre: Advances in Corrosion and Protection CY JUN 28-JUL 03, 1992 CL UNIV MANCHESTER, INST SCI & TECHNOL, MANCHESTER, UNITED KINGDOM SP UNIV MANCHESTER, INST SCI & TECHNOL, CORROS & PROTECT CTR HO UNIV MANCHESTER, INST SCI & TECHNOL AB Various thicknesses of TiAl3 coatings were produced on Ti3Al by pack aluminizing at various processing conditions. Thick coatings affected oxidation by increasing the amount of cracking and oxidation within the coating. Bulk TiAl3 and Al67X8Ti25 tau-phase alloys were oxidized in cyclic and isothermal oxidation from 800 to 1200-degrees-C. Anomalously high oxidation rates for TiAl3 were related to second phase aluminum oxidation and were eliminated by alloying. Chromium had an overall beneficial effect, while manganese additions could be catastrophic. Cyclic oxidation below 1000-degrees-C proved to be excellent for all alloys, while at 1200-degrees-C, spalling to bare metal, aluminum depletion and excessive TiO2 formation were related to more excessive degradation. RP SMIALEK, JL (reprint author), NASA,LEWIS RES CTR,2100 BROOKPARK RD,CLEVELAND,OH 44135, USA. NR 4 TC 46 Z9 46 U1 0 U2 5 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0010-938X J9 CORROS SCI JI Corrosion Sci. PY 1993 VL 35 IS 5-8 BP 1199 EP 1208 DI 10.1016/0010-938X(93)90340-M PG 10 WC Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Materials Science; Metallurgy & Metallurgical Engineering GA ML280 UT WOS:A1993ML28000041 ER PT S AU LAU, YT FINN, JM AF LAU, YT FINN, JM BE Krause, F Radler, KH Rudiger, G TI THE MAGNETIC-FIELD STRUCTURES OF A CLASS OF FAST DYNAMOS SO COSMIC DYNAMO SE IAU SYMPOSIA LA English DT Article; Proceedings Paper CT 157th Symposium of the International Astronomical Union: The Cosmic Dynamo CY SEP 07-11, 1992 CL POTSDAM, GERMANY SP INT ASTRON UNION DE FAST DYNAMO; KINEMATIC DYNAMO; CHAOTIC FLOW AB We study the magnetic field structures of fast kinematic dynamos for a class of steady chaotic flows with stagnation points. We find that the dynamos are generated by a stretch-fold-shear mechanism, which is effective only when the chaotic flow region is large enough and overlaps significantly with the rotating flux tubes. C1 UNIV MARYLAND,PLANT RES LAB,COLL PK,MD 20742. RP LAU, YT (reprint author), NASA,GODDARD SPACE FLIGHT CTR,INST NAT RESOURCES,CODE 9301,GREENBELT,MD 20771, USA. NR 4 TC 0 Z9 0 U1 0 U2 0 PU KLUWER ACADEMIC PUBL PI DORDRECHT PA PO BOX 17, 3300 AA DORDRECHT, NETHERLANDS SN 0074-1809 BN 0-7923-2546-X J9 IAU SYMP PY 1993 IS 157 BP 231 EP 234 PG 4 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA BZ60V UT WOS:A1993BZ60V00040 ER PT B AU NELSON, HG AF NELSON, HG BE Stoloff, NS Duquette, DJ Giamei, AF TI HYDROGEN AND TITANIUM BASE MATERIALS SO CRITICAL ISSUES IN THE DEVELOPMENT OF HIGH TEMPERATURE STRUCTURAL MATERIALS LA English DT Proceedings Paper CT Conference on Critical Issues in the Development of High Temperature Structural Materials CY MAR 07-14, 1993 CL KONA, HI C1 NASA,AMES RES CTR,MOFFETT FIELD,CA 94035. NR 0 TC 5 Z9 5 U1 3 U2 3 PU MINERALS, METALS & MATERIALS SOC PI WARRENDALE PA 420 COMMONWEALTH DR, WARRENDALE, PA 15086 BN 0-87339-257-4 PY 1993 BP 455 EP 464 PG 10 WC Materials Science, Ceramics; Materials Science, Composites SC Materials Science GA BA28W UT WOS:A1993BA28W00031 ER PT J AU WHEELER, RM COREY, KA SAGER, JC KNOTT, WM AF WHEELER, RM COREY, KA SAGER, JC KNOTT, WM TI GAS-EXCHANGE CHARACTERISTICS OF WHEAT STANDS GROWN IN A CLOSED, CONTROLLED ENVIRONMENT SO CROP SCIENCE LA English DT Article ID CARBON-DIOXIDE EXCHANGE; LEAF-AREA INDEX; SOYBEAN CANOPIES; SHORT-TERM; PHOTOSYNTHESIS; CROP; CO2; ENRICHMENT; INHIBITION AB Information on gas exchange of crop stands grown in controlled environments is limited, but is vital for assessing the use of crops for human life-support in closed habitats envisioned for space. Two studies were conducted to measure gas exchange of wheat stands (Triticum aestivum L. cv. Yecora Rojo) grown from planting to maturity in a large (20 m2 canopy area), closed growth chamber. Daily rates of dark-period respiration and net photosynthesis of the stand were calculated from rates of CO2 build-up during dark cycles and subsequent CO2 drawdown in the light (i.e., a closed-system approach). Lighting was provided as a 20-h photoperiod by high-pressure sodium lamps, with canopy-level photosynthetic photon flux density (PPFD) ranging from 500 to 800 mumol m-2 s-1 as canopy height increased. Net photosynthesis rates peaked near 27 mumol CO2 m-2 s-1 at 25 d after planting, which corresponded closely with stand closure, and then declined slowly with age. Similarly, dark-period respiration rates peaked near 14 mumol CO2 m-2 s-1 at 25 d and then gradually declined with age. Responses to short-term changes in irradiance after canopy closure indicated the stand light compensation point for photosynthesis to be near 200 mumol m-2 s-1 PPFD. Tests in which CO2 concentration was raised to almost-equal-to 2000 mumol mol-1 and then allowed to draw down to a compensation point showed that net photosynthesis was nearly saturated at > 1000 mumol mol-1; below almost-equal-to 500 mumol mol-1, net photosynthesis rates dropped sharply with decreasing CO2. The CO2 compensation point for photosynthesis occurred near 50 mumol mol-1. Short-term (24 h) temperature tests showed net photosynthesis at 20-degrees-C greater-than-or-equal-to 16-degrees-C > 24-degrees-C, while dark-period respiration at 24-degrees-C > 20-degrees-C > 16-degrees-C. Rates of stand evapotranspiration peaked near Day 25 and remained relatively constant until about Day 75, after which rates declined slowly. Results from these tests will be used to model the use of plants for CO2 removal, O2 production, and water evaporation for controlled ecological life support systems proposed for extraterrestrial environments. C1 UNIV MASSACHUSETTS,DEPT PLANT & SOIL SCI,AMHERST,MA 01003. RP WHEELER, RM (reprint author), NASA,MAIL CODE MD-RES,KENNEDY SPACE CTR,FL 32899, USA. NR 35 TC 33 Z9 33 U1 1 U2 5 PU CROP SCIENCE SOC AMER PI MADISON PA 677 S SEGOE ROAD, MADISON, WI 53711 SN 0011-183X J9 CROP SCI JI Crop Sci. PD JAN-FEB PY 1993 VL 33 IS 1 BP 161 EP 168 PG 8 WC Agronomy SC Agriculture GA KT475 UT WOS:A1993KT47500029 PM 11538198 ER PT J AU MASON, PV ISRAELSSON, UE PETRAC, D JACKSON, HW WORDEN, P PARMLEY, R AF MASON, PV ISRAELSSON, UE PETRAC, D JACKSON, HW WORDEN, P PARMLEY, R TI TECHNICAL CHALLENGES OF SATELLITE TEST OF THE EQUIVALENCE PRINCIPLE MISSION SO CRYOGENICS LA English DT Article; Proceedings Paper CT 1992 SPACE CRYOGENICS WORKSHOP CY JUN 15-16, 1992 CL MUNICH, GERMANY DE SPACE CRYOGENICS; STEP; TECHNICAL CHALLENGES AB The Satellite Test of the Equivalence Principle (STEP) experiment is being proposed to improve our knowledge of the equivalence of inertial and gravitational mass by a factor of 10(6), yielding a crucial test of one of the fundamental postulates of Einstein's theory of general relativity. The experiment will use six differential superconducting accelerometers in a spacecraft in low Earth orbit. The accelerometers will each contain two proof masses of different densities. If the equivalence principle is violated, the masses will oscillate with respect to each other at the orbital frequency. The mission will last six months and is planned for launch in 2000. The entire experiment must be cooled to 1.8 K and must be held to this level within 1 mK per orbit. A 200 dm3 superfluid helium dewar will maintain this environment. A crucial requirement is that any disturbances in the orbital frequency must generate gravitational variation signals much less than the expected signal. One source of such disturbance is the motion of the liquid helium in the local gravity gradient field, which rotates at orbital frequency with respect to the spacecraft. An electrostatic confinement system has been proposed for this purpose. This system will be described. A back-up system using the superfluid fountain effect will also be discussed. C1 STANFORD UNIV,STANFORD,CA 94305. LOCKHEED PALO ALTO RES LABS,PALO ALTO,CA 94304. RP MASON, PV (reprint author), JET PROP LAB,PASADENA,CA 91109, USA. NR 5 TC 1 Z9 1 U1 0 U2 0 PU BUTTERWORTH-HEINEMANN LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, OXON, ENGLAND OX5 1GB SN 0011-2275 J9 CRYOGENICS JI Cryogenics PY 1993 VL 33 IS 4 BP 390 EP 394 DI 10.1016/0011-2275(93)90166-L PG 5 WC Thermodynamics; Physics, Applied SC Thermodynamics; Physics GA KW393 UT WOS:A1993KW39300002 ER PT J AU KITTEL, P AF KITTEL, P TI COMPARISON OF DEWAR SUPPORTS FOR SPACE APPLICATIONS SO CRYOGENICS LA English DT Article; Proceedings Paper CT 1992 SPACE CRYOGENICS WORKSHOP CY JUN 15-16, 1992 CL MUNICH, GERMANY DE SPACE CRYOGENICS; DEWARS; SUPPORTS AB A simple one-dimensional model is developed to illustrate the relative merits of different Dewar support systems. The model considers how different supports affect the parasitic heat load on Dewars in both strength limited and resonant frequency limited applications. The model is used to compare straps, struts and disconnect supports. The comparison shows that struts are superior in strength limited applications; that straps are superior in resonant frequency limited applications; and disconnect struts are superior when the on-orbit resonant frequency requirement is lower than during launch. RP KITTEL, P (reprint author), NASA,AMES RES CTR,MOFFETT FIELD,CA 94035, USA. NR 3 TC 5 Z9 5 U1 0 U2 2 PU BUTTERWORTH-HEINEMANN LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, OXON, ENGLAND OX5 1GB SN 0011-2275 J9 CRYOGENICS JI Cryogenics PY 1993 VL 33 IS 4 BP 429 EP 434 DI 10.1016/0011-2275(93)90172-K PG 6 WC Thermodynamics; Physics, Applied SC Thermodynamics; Physics GA KW393 UT WOS:A1993KW39300008 ER PT J AU ROBINSON, AR MCGILLICUDDY, DJ CALMAN, J DUCKLOW, HW FASHAM, MJR HOGE, FE LESLIE, WG MCCARTHY, JJ PODEWSKI, S PORTER, DL SAURE, G YODER, JA AF ROBINSON, AR MCGILLICUDDY, DJ CALMAN, J DUCKLOW, HW FASHAM, MJR HOGE, FE LESLIE, WG MCCARTHY, JJ PODEWSKI, S PORTER, DL SAURE, G YODER, JA TI MESOSCALE AND UPPER OCEAN VARIABILITIES DURING THE 1989 JGOFS BLOOM STUDY SO DEEP-SEA RESEARCH PART II-TOPICAL STUDIES IN OCEANOGRAPHY LA English DT Article ID COLD-CORE EDDY; EASTERN NORTH-ATLANTIC; SATELLITE ALTIMETRY; TOPOGRAPHY; RING AB Altimetric data from Geosat and some critical hydrographic measurements were used to estimate in real time the mesoscale physical oceanographic environment surrounding the Joint Global Ocean Flux Study (JGOFS) 1989 North Atlantic Bloom Experiment. Three cyclonic eddies, including an exceptionally large one, evolved and interacted over the 10 weeks of observations. Subsequent analysis of all available hydrographic data confirmed the real time estimates and provided further quantitative information concerning the mesoscale and submesoscale structure of the upper ocean. Remotely sensed indicators of near-surface chlorophyll content reveal significant biological variability on these wavelengths. The altimetric and hydrographic data have been assimilated into a dynamical model to produce optimal estimates of physical fields of interest as they evolve in time for use in physical and biological process studies. C1 JOHNS HOPKINS UNIV, APPL PHYS LAB, LAUREL, MD 20723 USA. UNIV MARYLAND, CEES, HORN POINT LAB, CAMBRIDGE, MD 21613 USA. CHILWORTH RES CTR, JAMES RENNELL CTR OCEAN CIRCULAT, SOUTHAMPTON SO1 7NS, ENGLAND. NASA, GODDARD SPACE FLIGHT CTR, WALLOPS ISL, VA 23337 USA. UNIV KIEL, INST MEERESKUNDE, W-2300 KIEL 1, GERMANY. UNIV RHODE ISL, GRAD SCH OCEANOG, NARRAGANSETT, RI 02882 USA. RP ROBINSON, AR (reprint author), HARVARD UNIV, DEPT EARTH & PLANETARY SCI, CAMBRIDGE, MA 02138 USA. NR 30 TC 50 Z9 50 U1 0 U2 5 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLAND SN 0967-0645 EI 1879-0100 J9 DEEP-SEA RES PT II JI Deep-Sea Res. Part II-Top. Stud. Oceanogr. PY 1993 VL 40 IS 1-2 BP 9 EP + DI 10.1016/0967-0645(93)90004-7 PG 1 WC Oceanography SC Oceanography GA KJ951 UT WOS:A1993KJ95100003 ER PT J AU YODER, JA AIKEN, J SWIFT, RN HOGE, FE STEGMANN, PM AF YODER, JA AIKEN, J SWIFT, RN HOGE, FE STEGMANN, PM TI SPATIAL VARIABILITY IN NEAR-SURFACE CHLOROPHYLL-A FLUORESCENCE MEASURED BY THE AIRBORNE OCEANOGRAPHIC LIDAR (AOL) SO DEEP-SEA RESEARCH PART II-TOPICAL STUDIES IN OCEANOGRAPHY LA English DT Article ID OCEAN COLOR MEASUREMENT; CONTINENTAL-SHELF; NORTH-ATLANTIC; SCALES; CALIBRATION; SATELLITE AB The primary purpose of the aircraft remote sensing component of the North Atlantic Bloom Experiment (NABE) was to: (1) quantify spatial patterns of surface Chl a variability and covariability with temperature (T) within the NABE study regions along the 20-degrees-W meridian near 48 and 60-degrees-N; and (2) determine if the major NABE ship and mooring locations were representative of surrounding ocean waters with respect to large-scale distributions of surface Chl a and T. The sampling platform was a NASA P-3 aircraft equipped with the Airborne Oceanographic Lidar (AOL) system, which measures laser-induced Chl a fluorescence (LICF), upwelling spectral radiance and surface temperature (T). Results collected during nine AOL missions conducted between 26 April and 3 June show considerable mesoscale variability in LICF and T. Spatial statistics (structure functions) showed that the dominant scales of LICF and T were significantly correlated in the range 10-290 km. Spectral analysis of the results of long flight lines showed spectral slopes averaging -2 for both LICF and T for spatial scales in the range 1.2-50 km. As for previous investigations of this type, we interpret the correlation between LICF and T as evidence that physical processes such as upwelling and mixing are dominant processes affecting spatial variations in Chl a distributions in the North Atlantic during the period of our sampling. The minimum dominant T and LICF spatial scales (ca 10 km) we determined from structure functions are similar to minimum scales predicted from models (WOODS, 1988, In: Toward a theory on biological-physical interactions in the world ocean, Kluwer Academic, Boston, pp. 7-30) of upwelling induced by vortex contraction on the anticyclonic side of mesoscale jets. The NABE experiment was planned with the explicit assumption that major biological and chemical gradients are in the north-south direction in the northeast Atlantic. Our results support this assumption, and we observed no large-scale (>200 km), east-to-west trends in surface Chl a in the two principal study areas. Our analyses show that satellite ocean color scanners with pixel resolution of 4 x 4 km will generally detect the major spatial patterns of Chl a distributions (at scales >0.3 km) in near surface waters during the spring bloom in the North Atlantic. C1 PLYMOUTH MARINE LAB,PLYMOUTH PL1 3DH,ENGLAND. EG & G WASHINGTON ANALYT SERV INC,POCOMOKE CITY,MD 21851. NASA,GODDARD SPACE FLIGHT CTR,WALLOPS ISL,VA 23337. RP YODER, JA (reprint author), UNIV RHODE ISL,GRAD SCH OCEANOG,S FERRY RD,NARRAGANSETT,RI 02882, USA. OI yoder, james/0000-0002-2700-8681 NR 29 TC 35 Z9 36 U1 0 U2 4 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0967-0645 J9 DEEP-SEA RES PT II JI Deep-Sea Res. Part II-Top. Stud. Oceanogr. PY 1993 VL 40 IS 1-2 BP 37 EP 53 DI 10.1016/0967-0645(93)90005-8 PG 17 WC Oceanography SC Oceanography GA KJ951 UT WOS:A1993KJ95100004 ER PT J AU HOGE, FE SWIFT, RN AF HOGE, FE SWIFT, RN TI THE INFLUENCE OF CHLOROPHYLL PIGMENT UPON UPWELLING SPECTRAL RADIANCES FROM THE NORTH-ATLANTIC OCEAN - AN ACTIVE PASSIVE CORRELATION SPECTROSCOPY STUDY SO DEEP-SEA RESEARCH PART II-TOPICAL STUDIES IN OCEANOGRAPHY LA English DT Article ID WARM CORE RING; FLUORESCENCE; SATELLITE; SHIP AB Active-passive correlation spectroscopy (APCS) methods have been applied to airborne upwelled radiances and 532 nm pulsed laser-induced phytoplankton chlorophyll pigment fluorescence obtained during the North Atlantic Spring Bloom Experiment (NABE) of the Joint Global Ocean Flux Study (JGOFS). The active-passive spectral data obtained during a transect between Ireland and Iceland over 300 km cloud-free portion of the JGOFS 20-degrees-W longitude line have been subjected to two-band radiance-ratio analyses. The chlorophyll pigment was found to significantly influence the upwelled radiances over considerable portions of the observed 380-740 nm color spectrum. Satisfactory recovery of chlorophyll pigment concentrated in North Atlantic case 1 waters was obtained over a broad region of the blue-green spectrum (approximately 430-530 nm) when ratioed with bands of the green-yellow spectrum (approximately 540-585 nm). The data confirm that the 420/550 nm band combination out-performs 443/550 nm for chlorophyll concentrations greater than or similar to 1.5 mg m-3 however, the results indicate that further improvement could be realized using the 490 nm band in combination with either the 555 or 565 nm bands. Chlorophyll pigment was found to be recoverable using the 652/685 nm chlorophyll absorption/fluorescence radiance ratio. Other findings include satisfactory chlorophyll recovery using the 415 nm band ratioed with bands in the 562-584 nm spectral region, suggesting that these waters were bloom dominated with a relatively low concentration of dissolved organic matter (DOM). This latter finding agrees with low DOM fluorescence values found using an auxiliary 355 nm laser excitation source. To illustrate these experimental findings, radiance-ratio spectral correlation matrices are presented together with corresponding along-track active/passive cross-sectional profiles. C1 EG&G WASHINGTON ANALYT SERV INC,POCOMOKE CITY,MD 21851. RP HOGE, FE (reprint author), NASA,GODDARD SPACE FLIGHT CTR,WALLOPS FLIGHT FACIL,WALLOPS ISL,VA 23337, USA. NR 18 TC 13 Z9 13 U1 0 U2 0 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0967-0645 J9 DEEP-SEA RES PT II JI Deep-Sea Res. Part II-Top. Stud. Oceanogr. PY 1993 VL 40 IS 1-2 BP 265 EP 277 DI 10.1016/0967-0645(93)90017-H PG 13 WC Oceanography SC Oceanography GA KJ951 UT WOS:A1993KJ95100016 ER PT B AU SAUERWEIN, TA MOLINO, JA AF SAUERWEIN, TA MOLINO, JA GP HUMAN FACTORS & ERGON SOC TI SIMULATING THE REPLACEMENT OF SPACECRAFT MODULES BY MEANS OF A TELEROBOT SO DESIGNING FOR DIVERSITY, VOLS 1 AND 2 LA English DT Proceedings Paper CT Human-Factors-and-Ergomonics-Society 37th Annual Meeting: Designing for Diversity CY OCT 11-15, 1993 CL SEATTLE, WA SP HUMAN FACTORS & ERGON SOC C1 NASA,GODDARD SPACE FLIGHT CTR,GREENBELT,MD 20771. NR 0 TC 0 Z9 0 U1 0 U2 0 PU HUMAN FACTORS AND ERGONOMICS SOC PI SANTA MONICA PA PO BOX 1369, SANTA MONICA, CA 90406-1369 PY 1993 BP 43 EP 46 PG 4 WC Ergonomics; Multidisciplinary Sciences SC Engineering; Science & Technology - Other Topics GA BZ48S UT WOS:A1993BZ48S00009 ER PT B AU JENSEN, DG AF JENSEN, DG GP HUMAN FACTORS & ERGON SOC TI SPACE STATION FREEDOM AURAL TOXIC ALARM DEVELOPMENT SO DESIGNING FOR DIVERSITY, VOLS 1 AND 2 LA English DT Proceedings Paper CT Human-Factors-and-Ergomonics-Society 37th Annual Meeting: Designing for Diversity CY OCT 11-15, 1993 CL SEATTLE, WA SP HUMAN FACTORS & ERGON SOC C1 NASA,LYNDON B JOHNSON SPACE CTR,HOUSTON,TX 77058. NR 0 TC 0 Z9 0 U1 0 U2 0 PU HUMAN FACTORS AND ERGONOMICS SOC PI SANTA MONICA PA PO BOX 1369, SANTA MONICA, CA 90406-1369 PY 1993 BP 52 EP 54 PG 3 WC Ergonomics; Multidisciplinary Sciences SC Engineering; Science & Technology - Other Topics GA BZ48S UT WOS:A1993BZ48S00011 ER PT B AU DORIGHI, NS ELLIS, SR GRUNWALD, AJ AF DORIGHI, NS ELLIS, SR GRUNWALD, AJ GP HUMAN FACTORS & ERGON SOC TI PERSPECTIVE FORMAT FOR A PRIMARY FLIGHT DISPLAY (ADI) AND ITS EFFECT ON PILOT SPATIAL AWARENESS SO DESIGNING FOR DIVERSITY, VOLS 1 AND 2 LA English DT Proceedings Paper CT Human-Factors-and-Ergomonics-Society 37th Annual Meeting: Designing for Diversity CY OCT 11-15, 1993 CL SEATTLE, WA SP HUMAN FACTORS & ERGON SOC C1 NASA,AMES RES CTR,DIV AEROSP HUMAN FACTORS RES,MOFFETT FIELD,CA 94035. NR 0 TC 3 Z9 3 U1 0 U2 0 PU HUMAN FACTORS AND ERGONOMICS SOC PI SANTA MONICA PA PO BOX 1369, SANTA MONICA, CA 90406-1369 PY 1993 BP 88 EP 92 PG 5 WC Ergonomics; Multidisciplinary Sciences SC Engineering; Science & Technology - Other Topics GA BZ48S UT WOS:A1993BZ48S00018 ER PT B AU ANDRE, AD HEERS, ST MCCANN, RS CASHION, PA AF ANDRE, AD HEERS, ST MCCANN, RS CASHION, PA GP HUMAN FACTORS & ERGON SOC TI PREVIEW AND PRACTICE - EFFECTS ON SCHEDULING BEHAVIOR IN A SIMULATED FLIGHT TASK SO DESIGNING FOR DIVERSITY, VOLS 1 AND 2 LA English DT Proceedings Paper CT Human-Factors-and-Ergomonics-Society 37th Annual Meeting: Designing for Diversity CY OCT 11-15, 1993 CL SEATTLE, WA SP HUMAN FACTORS & ERGON SOC C1 NASA,AMES RES CTR,WESTERN AEROSP LABS INC,MOFFETT FIELD,CA 94035. NR 0 TC 0 Z9 0 U1 0 U2 0 PU HUMAN FACTORS AND ERGONOMICS SOC PI SANTA MONICA PA PO BOX 1369, SANTA MONICA, CA 90406-1369 PY 1993 BP 132 EP 136 PG 5 WC Ergonomics; Multidisciplinary Sciences SC Engineering; Science & Technology - Other Topics GA BZ48S UT WOS:A1993BZ48S00027 ER PT B AU ORASANU, J DISMUKES, RK FISCHER, U AF ORASANU, J DISMUKES, RK FISCHER, U GP HUMAN FACTORS & ERGON SOC TI DECISION ERRORS IN THE COCKPIT SO DESIGNING FOR DIVERSITY, VOLS 1 AND 2 LA English DT Proceedings Paper CT Human-Factors-and-Ergomonics-Society 37th Annual Meeting: Designing for Diversity CY OCT 11-15, 1993 CL SEATTLE, WA SP HUMAN FACTORS & ERGON SOC C1 NASA,AMES RES CTR,MOFFETT FIELD,CA 94035. NR 0 TC 1 Z9 1 U1 0 U2 0 PU HUMAN FACTORS AND ERGONOMICS SOC PI SANTA MONICA PA PO BOX 1369, SANTA MONICA, CA 90406-1369 PY 1993 BP 363 EP 367 PG 5 WC Ergonomics; Multidisciplinary Sciences SC Engineering; Science & Technology - Other Topics GA BZ48S UT WOS:A1993BZ48S00074 ER PT B AU FOYLE, DC MCCANN, RS SANFORD, BD SCHWIRZKE, MFJ AF FOYLE, DC MCCANN, RS SANFORD, BD SCHWIRZKE, MFJ GP HUMAN FACTORS & ERGON SOC TI ATTENTIONAL EFFECTS WITH SUPERIMPOSED SYMBOLOGY - IMPLICATIONS FOR HEAD-UP DISPLAYS (HUD) SO DESIGNING FOR DIVERSITY, VOLS 1 AND 2 LA English DT Proceedings Paper CT Human-Factors-and-Ergomonics-Society 37th Annual Meeting: Designing for Diversity CY OCT 11-15, 1993 CL SEATTLE, WA SP HUMAN FACTORS & ERGON SOC C1 NASA,AMES RES CTR,MOFFETT FIELD,CA 94035. NR 0 TC 5 Z9 5 U1 1 U2 3 PU HUMAN FACTORS AND ERGONOMICS SOC PI SANTA MONICA PA PO BOX 1369, SANTA MONICA, CA 90406-1369 PY 1993 BP 1340 EP 1344 PG 5 WC Ergonomics; Multidisciplinary Sciences SC Engineering; Science & Technology - Other Topics GA BZ48S UT WOS:A1993BZ48S00258 ER PT B AU ADELSTEIN, BD ELLIS, SR AF ADELSTEIN, BD ELLIS, SR GP HUMAN FACTORS & ERGON SOC TI EFFECT OF HEAD-SLAVED VISUAL IMAGE ROLL ON SPATIAL SITUATION AWARENESS SO DESIGNING FOR DIVERSITY, VOLS 1 AND 2 LA English DT Proceedings Paper CT Human-Factors-and-Ergomonics-Society 37th Annual Meeting: Designing for Diversity CY OCT 11-15, 1993 CL SEATTLE, WA SP HUMAN FACTORS & ERGON SOC C1 NASA,AMES RES CTR,DIV AEROSP HUMAN FACTORS RES,ADV DISPLAYS & SPATIAL PERCEPT GRP,MOFFETT FIELD,CA 94035. NR 0 TC 6 Z9 6 U1 0 U2 0 PU HUMAN FACTORS AND ERGONOMICS SOC PI SANTA MONICA PA PO BOX 1369, SANTA MONICA, CA 90406-1369 PY 1993 BP 1350 EP 1354 PG 5 WC Ergonomics; Multidisciplinary Sciences SC Engineering; Science & Technology - Other Topics GA BZ48S UT WOS:A1993BZ48S00260 ER PT B AU NEWMAN, JC DAWICKE, DS SUTTON, MA BIGELOW, CA AF NEWMAN, JC DAWICKE, DS SUTTON, MA BIGELOW, CA BE Blom, AF TI A FRACTURE CRITERION FOR WIDESPREAD CRACKING IN THIN-SHEET ALUMINUM-ALLOYS SO DURABILITY AND STRUCTURAL INTEGRITY OF AIRFRAMES, VOLS 1 AND 2 LA English DT Proceedings Paper CT 17th Symposium of the International-Committee-on-Aeronautical-Fatigue: Durability and Structural Integrity of Airframes (ICAF 93) CY JUN 09-11, 1993 CL STOCKHOLM, SWEDEN SP INT COMM AERONAUT FATIGUE, AERONAUT RES INST SWEDEN, DEFENCE MAT ADM SWEDEN, SAAB MIL AIRCRAFT, SWEDISH NATL BOARD IND & TECH DEV, STOCKHOLM CITY COUNCIL, SWEDISH SOC AERONAUT & ASTRONAUT, FATIGUE TECHNOL INC, VOLVO FLYMOTOR AB, SCANDINAVIAN AIRLINES SYST, FFV AEROTECH INFO, COMP SCI APPL MECH IND, SWEDISH INST, SWEDISH CIVIL AVIAT ADM C1 NASA,LANGLEY RES CTR,HAMPTON,VA 23665. NR 0 TC 2 Z9 2 U1 0 U2 0 PU ENGINEERING MATERIALS ADVISORY SERVICES LTD PI WARLEY PA 339 HALESOWEN RD, CRADLEY HEATH, WARLEY, W MIDLANDS, ENGLAND B64 6PH BN 0-947817-66-2 PY 1993 BP 443 EP 467 PG 25 WC Engineering, Aerospace SC Engineering GA BB27T UT WOS:A1993BB27T00017 ER PT B AU KECKLER, CR AF KECKLER, CR BE Kirk, CL Hughes, PC TI AN INTEGRATED APPROACH TO SPACECRAFT CONTROL DESIGN SO DYNAMICS AND CONTROL OF STRUCTURES IN SPACE II LA English DT Proceedings Paper CT 2nd International Conference on Dynamics and Control of Structures in Space CY SEP 06-10, 1993 CL CRANFIELD INST TECHNOL, CRANFIELD, ENGLAND SP CRANFIELD INST TECHNOL, COLL AERONAUT HO CRANFIELD INST TECHNOL C1 NATL AERONAUT & SPACE ADM,LANGLEY RES CTR,HAMPTON,VA 23681. NR 0 TC 0 Z9 0 U1 0 U2 0 PU COMPUTATIONAL MECHANICS PUBLICATIONS LTD PI SOUTHAMPTON PA ASHURST LODGE, SOUTHAMPTON, HANTS, ENGLAND S04 2AA BN 1-85312-247-5 PY 1993 BP 621 EP 635 PG 15 WC Engineering, Aerospace; Mechanics SC Engineering; Mechanics GA BZ42P UT WOS:A1993BZ42P00035 ER PT S AU VOORHIES, CV AF VOORHIES, CV BE LeMouel, JL Smylie, DE Herring, T TI GEOMAGNETIC ESTIMATES OF STEADY SURFICIAL CORE FLOW AND FLUX DIFFUSION - UNEXPECTED GEODYNAMO EXPERIMENTS SO DYNAMICS OF EARTHS DEEP INTERIOR AND EARTH ROTATION SE GEOPHYSICAL MONOGRAPH SERIES LA English DT Proceedings Paper CT Inter-Association Symposia on Dynamics of Earths Deep Interior and Earth Rotation, at the IUGG General Assembly CY AUG, 1991 CL VIENNA, AUSTRIA SP AMER GEOPHYS UNION, INT UNION GEODESY & GEOPHYS C1 NASA,GODDARD SPACE FLIGHT CTR,GEODYNAM BRANCH,GREENBELT,MD 20771. RI Voorhies, Coerte/D-4672-2012 NR 0 TC 13 Z9 13 U1 0 U2 0 PU AMER GEOPHYSICAL UNION PI WASHINGTON PA 2000 FLORIDA AVE NW, WASHINGTON, DC 20009 SN 0065-8448 BN 0-87590-463-7 J9 GEOPH MONOG SERIES PY 1993 VL 72 BP 113 EP 125 PG 13 WC Geosciences, Multidisciplinary SC Geology GA BZ56E UT WOS:A1993BZ56E00013 ER PT J AU RAMPINO, MR CALDEIRA, K AF RAMPINO, MR CALDEIRA, K TI MAJOR EPISODES OF GEOLOGIC CHANGE - CORRELATIONS, TIME STRUCTURE AND POSSIBLE CAUSES SO EARTH AND PLANETARY SCIENCE LETTERS LA English DT Article ID MAGNETIC-FIELD REVERSALS; MASS EXTINCTIONS; GALACTIC PLANE; COMETARY IMPACTS; FLOOD-BASALT; PERIODICITY; RECORD; MANTLE; MOTION; SCALE AB Published data sets of major geologic events of the past approximately 250 Myr (extinction events, sea-level lows, continental flood-basalt eruptions, mountain-building events, abrupt changes in sea-floor spreading, ocean-anoxic and blackshale events and the largest evaporite deposits) have been synthesized (with estimated errors). These events show evidence for a statistically significant periodic component with an underlying periodicity, formally equal to 26.6 Myr, and a recent maximum, close to the present time. The cycle may not be strictly periodic, but a periodicity of approximately 30 Myr is robust to probable errors in dating of the geologic events. The intervals of geologic change seem to involve jumps in sea-floor spreading associated with episodic continental rifting, volcanism, enhanced orogeny, global sea-level changes and fluctuations in climate. The period may represent a purely internal earth-pulsation, but evidence of planetesimal impacts at several extinction boundaries, and a possible underlying cycle of 28-36 Myr in crater ages, suggests that highly energetic impacts may be affecting global tectonics. A cyclic increase in the flux of planetesimals might result from the passage of the Solar System through the central plane of the Milky Way Galaxy-an event with a periodicity and mean phasing similar to that detected in the geologic changes. C1 NASA,GODDARD INST SPACE STUDIES,NEW YORK,NY 10025. PENN STATE UNIV,CTR EARTH SYST SCI,UNIV PK,PA 16802. PENN STATE UNIV,DEPT GEOSCI,UNIV PK,PA 16802. RP RAMPINO, MR (reprint author), NYU,DEPT APPL SCI,EARTH SYST GRP,BARNEY BLDG,26-36 STUVEYSANT ST,NEW YORK,NY 10003, USA. RI Caldeira, Ken/E-7914-2011 NR 92 TC 60 Z9 63 U1 0 U2 3 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0012-821X J9 EARTH PLANET SC LETT JI Earth Planet. Sci. Lett. PD JAN PY 1993 VL 114 IS 2-3 BP 215 EP 227 DI 10.1016/0012-821X(93)90026-6 PG 13 WC Geochemistry & Geophysics SC Geochemistry & Geophysics GA KK958 UT WOS:A1993KK95800001 ER PT S AU ANGELICI, GL SKILES, JW POPOVICI, LZ AF ANGELICI, GL SKILES, JW POPOVICI, LZ BE Zygielbaum, A TI SUPPORT OF AN ACTIVE SCIENCE PROJECT BY A LARGE INFORMATION-SYSTEM - LESSONS FOR THE EOS ERA SO EARTH AND SPACE SCIENCE INFORMATION SYSTEMS SE AIP CONFERENCE PROCEEDINGS LA English DT Proceedings Paper CT International Space Year Conference on Earth and Space Science Information Systems CY FEB 10-13, 1992 CL PASADENA, CA C1 NASA,AMES RES CTR,MOFFETT FIELD,CA 94035. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AIP PRESS PI WOODBURY PA AMERICAN INSTITUTE OF PHYSICS 500 SUNNYSIDE BOULEVARD, WOODBURY, NY 11797-2999 SN 0094-243X BN 1-56396-094-X J9 AIP CONF PROC PY 1993 IS 283 BP 3 EP 9 PG 7 WC Computer Science, Information Systems; Remote Sensing SC Computer Science; Remote Sensing GA BA05N UT WOS:A1993BA05N00005 ER PT S AU BECK, L WOOD, B WHITNEY, S ROSSI, R SPANNER, M RODRIGUEZ, M RODRIGUEZRAMIREZ, A SALUTE, J LEGTERS, L ROBERTS, D REJMANKOVA, E WASHINO, R AF BECK, L WOOD, B WHITNEY, S ROSSI, R SPANNER, M RODRIGUEZ, M RODRIGUEZRAMIREZ, A SALUTE, J LEGTERS, L ROBERTS, D REJMANKOVA, E WASHINO, R BE Zygielbaum, A TI A REMOTE-SENSING AND GEOGRAPHIC INFORMATION-SYSTEM APPROACH TO SAMPLING MALARIA VECTOR HABITATS IN CHIAPAS, MEXICO SO EARTH AND SPACE SCIENCE INFORMATION SYSTEMS SE AIP CONFERENCE PROCEEDINGS LA English DT Proceedings Paper CT International Space Year Conference on Earth and Space Science Information Systems CY FEB 10-13, 1992 CL PASADENA, CA C1 NASA,AMES RES CTR,TGS TECHNOL INC,MOFFETT FIELD,CA 94035. NR 0 TC 0 Z9 0 U1 0 U2 2 PU AIP PRESS PI WOODBURY PA AMERICAN INSTITUTE OF PHYSICS 500 SUNNYSIDE BOULEVARD, WOODBURY, NY 11797-2999 SN 0094-243X BN 1-56396-094-X J9 AIP CONF PROC PY 1993 IS 283 BP 16 EP 21 PG 6 WC Computer Science, Information Systems; Remote Sensing SC Computer Science; Remote Sensing GA BA05N UT WOS:A1993BA05N00007 ER PT S AU HAN, D AF HAN, D BE Zygielbaum, A TI TROPICAL RAINFALL MEASURING MISSION SCIENCE DATA AND INFORMATION-SYSTEM SO EARTH AND SPACE SCIENCE INFORMATION SYSTEMS SE AIP CONFERENCE PROCEEDINGS LA English DT Proceedings Paper CT International Space Year Conference on Earth and Space Science Information Systems CY FEB 10-13, 1992 CL PASADENA, CA C1 NASA,GODDARD SPACE FLIGHT CTR,GREENBELT,MD 20771. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AIP PRESS PI WOODBURY PA AMERICAN INSTITUTE OF PHYSICS 500 SUNNYSIDE BOULEVARD, WOODBURY, NY 11797-2999 SN 0094-243X BN 1-56396-094-X J9 AIP CONF PROC PY 1993 IS 283 BP 133 EP 133 PG 1 WC Computer Science, Information Systems; Remote Sensing SC Computer Science; Remote Sensing GA BA05N UT WOS:A1993BA05N00024 ER PT S AU HARBERTS, R AF HARBERTS, R BE Zygielbaum, A TI DEVELOPING A DATA ARCHITECTURE FOR EOSDIS SO EARTH AND SPACE SCIENCE INFORMATION SYSTEMS SE AIP CONFERENCE PROCEEDINGS LA English DT Proceedings Paper CT International Space Year Conference on Earth and Space Science Information Systems CY FEB 10-13, 1992 CL PASADENA, CA C1 NASA,GODDARD SPACE FLIGHT CTR,EOSDIS PROJECT,GREENBELT,MD 20771. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AIP PRESS PI WOODBURY PA AMERICAN INSTITUTE OF PHYSICS 500 SUNNYSIDE BOULEVARD, WOODBURY, NY 11797-2999 SN 0094-243X BN 1-56396-094-X J9 AIP CONF PROC PY 1993 IS 283 BP 134 EP 134 PG 1 WC Computer Science, Information Systems; Remote Sensing SC Computer Science; Remote Sensing GA BA05N UT WOS:A1993BA05N00025 ER PT S AU MEESON, BW STREBEL, DE PAYLOR, ED AF MEESON, BW STREBEL, DE PAYLOR, ED BE Zygielbaum, A TI EARTH-SCIENCE INFORMATION-SYSTEMS - A PERSPECTIVE FROM THE PILOT LAND DATA SYSTEM SO EARTH AND SPACE SCIENCE INFORMATION SYSTEMS SE AIP CONFERENCE PROCEEDINGS LA English DT Proceedings Paper CT International Space Year Conference on Earth and Space Science Information Systems CY FEB 10-13, 1992 CL PASADENA, CA C1 NASA,GODDARD SPACE FLIGHT CTR,GREENBELT,MD 20771. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AIP PRESS PI WOODBURY PA AMERICAN INSTITUTE OF PHYSICS 500 SUNNYSIDE BOULEVARD, WOODBURY, NY 11797-2999 SN 0094-243X BN 1-56396-094-X J9 AIP CONF PROC PY 1993 IS 283 BP 216 EP 226 PG 11 WC Computer Science, Information Systems; Remote Sensing SC Computer Science; Remote Sensing GA BA05N UT WOS:A1993BA05N00035 ER PT S AU WILLIAMS, DL LAWRENCE, WT LEVINE, ER RANSON, KJ KNOX, RG SHUGART, HH AF WILLIAMS, DL LAWRENCE, WT LEVINE, ER RANSON, KJ KNOX, RG SHUGART, HH BE Zygielbaum, A TI FOREST ECOSYSTEM DYNAMICS - A PROJECT FOR UNDERSTANDING NORTHERN ECOSYSTEMS AND THEIR RESPONSE TO GLOBAL CHANGE SO EARTH AND SPACE SCIENCE INFORMATION SYSTEMS SE AIP CONFERENCE PROCEEDINGS LA English DT Proceedings Paper CT International Space Year Conference on Earth and Space Science Information Systems CY FEB 10-13, 1992 CL PASADENA, CA C1 NASA,GODDARD SPACE FLIGHT CTR,BIOSPHER SCI BRANCH,GREENBELT,MD 20771. RI Knox, Robert/E-9657-2011; Ranson, Kenneth/G-2446-2012; Shugart, Herman/C-5156-2009 OI Ranson, Kenneth/0000-0003-3806-7270; NR 0 TC 0 Z9 0 U1 0 U2 0 PU AIP PRESS PI WOODBURY PA AMERICAN INSTITUTE OF PHYSICS 500 SUNNYSIDE BOULEVARD, WOODBURY, NY 11797-2999 SN 0094-243X BN 1-56396-094-X J9 AIP CONF PROC PY 1993 IS 283 BP 315 EP 317 PG 3 WC Computer Science, Information Systems; Remote Sensing SC Computer Science; Remote Sensing GA BA05N UT WOS:A1993BA05N00046 ER PT S AU WOOD, B VESECKY, J LAWLESS, J BECK, L SALUTE, J AF WOOD, B VESECKY, J LAWLESS, J BECK, L SALUTE, J BE Zygielbaum, A TI MEDSAT - A SATELLITE SYSTEM FOR SURVEILLANCE OF TROPICAL VECTOR-BORNE DISEASES SO EARTH AND SPACE SCIENCE INFORMATION SYSTEMS SE AIP CONFERENCE PROCEEDINGS LA English DT Proceedings Paper CT International Space Year Conference on Earth and Space Science Information Systems CY FEB 10-13, 1992 CL PASADENA, CA C1 NASA,AMES RES CTR,TGS TECHNOL INC,MOFFETT FIELD,CA 94035. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AIP PRESS PI WOODBURY PA AMERICAN INSTITUTE OF PHYSICS 500 SUNNYSIDE BOULEVARD, WOODBURY, NY 11797-2999 SN 0094-243X BN 1-56396-094-X J9 AIP CONF PROC PY 1993 IS 283 BP 318 EP 319 PG 2 WC Computer Science, Information Systems; Remote Sensing SC Computer Science; Remote Sensing GA BA05N UT WOS:A1993BA05N00047 ER PT S AU THOMAS, VL WAKIM, NT AF THOMAS, VL WAKIM, NT BE Zygielbaum, A TI COMPUTER NETWORK ACCESS TO SCIENTIFIC-INFORMATION SYSTEMS FOR MINORITY UNIVERSITIES SO EARTH AND SPACE SCIENCE INFORMATION SYSTEMS SE AIP CONFERENCE PROCEEDINGS LA English DT Proceedings Paper CT International Space Year Conference on Earth and Space Science Information Systems CY FEB 10-13, 1992 CL PASADENA, CA C1 NASA,GODDARD SPACE FLIGHT CTR,GREENBELT,MD 20771. NR 0 TC 1 Z9 1 U1 0 U2 0 PU AIP PRESS PI WOODBURY PA AMERICAN INSTITUTE OF PHYSICS 500 SUNNYSIDE BOULEVARD, WOODBURY, NY 11797-2999 SN 0094-243X BN 1-56396-094-X J9 AIP CONF PROC PY 1993 IS 283 BP 375 EP 379 PG 5 WC Computer Science, Information Systems; Remote Sensing SC Computer Science; Remote Sensing GA BA05N UT WOS:A1993BA05N00057 ER PT S AU CAPUTO, R HIHN, JM DASTOOR, M AF CAPUTO, R HIHN, JM DASTOOR, M BE Zygielbaum, A TI MAKING GLOBAL CHANGE DATA FROM SATELLITES AVAILABLE FOR POLITICAL DECISION-MAKING SO EARTH AND SPACE SCIENCE INFORMATION SYSTEMS SE AIP CONFERENCE PROCEEDINGS LA English DT Proceedings Paper CT International Space Year Conference on Earth and Space Science Information Systems CY FEB 10-13, 1992 CL PASADENA, CA C1 JET PROP LAB,PASADENA,CA 91109. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AIP PRESS PI WOODBURY PA AMERICAN INSTITUTE OF PHYSICS 500 SUNNYSIDE BOULEVARD, WOODBURY, NY 11797-2999 SN 0094-243X BN 1-56396-094-X J9 AIP CONF PROC PY 1993 IS 283 BP 383 EP 393 PG 11 WC Computer Science, Information Systems; Remote Sensing SC Computer Science; Remote Sensing GA BA05N UT WOS:A1993BA05N00058 ER PT S AU CLARKE, TC FISHER, PC AF CLARKE, TC FISHER, PC BE Zygielbaum, A TI THE GALILEO SCIENCE DATA SYSTEM SO EARTH AND SPACE SCIENCE INFORMATION SYSTEMS SE AIP CONFERENCE PROCEEDINGS LA English DT Proceedings Paper CT International Space Year Conference on Earth and Space Science Information Systems CY FEB 10-13, 1992 CL PASADENA, CA C1 JET PROP LAB,PASADENA,CA 91109. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AIP PRESS PI WOODBURY PA AMERICAN INSTITUTE OF PHYSICS 500 SUNNYSIDE BOULEVARD, WOODBURY, NY 11797-2999 SN 0094-243X BN 1-56396-094-X J9 AIP CONF PROC PY 1993 IS 283 BP 394 EP 410 PG 17 WC Computer Science, Information Systems; Remote Sensing SC Computer Science; Remote Sensing GA BA05N UT WOS:A1993BA05N00059 ER PT S AU FAYYAD, UM DOYLE, RJ WEIR, WN DJORGOVSKI, S AF FAYYAD, UM DOYLE, RJ WEIR, WN DJORGOVSKI, S BE Zygielbaum, A TI APPLYING MACHINE LEARNING CLASSIFICATION TECHNIQUES TO AUTOMATE SKY OBJECT CATALOGING SO EARTH AND SPACE SCIENCE INFORMATION SYSTEMS SE AIP CONFERENCE PROCEEDINGS LA English DT Proceedings Paper CT International Space Year Conference on Earth and Space Science Information Systems CY FEB 10-13, 1992 CL PASADENA, CA C1 JET PROP LAB,PASADENA,CA 91109. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AIP PRESS PI WOODBURY PA AMERICAN INSTITUTE OF PHYSICS 500 SUNNYSIDE BOULEVARD, WOODBURY, NY 11797-2999 SN 0094-243X BN 1-56396-094-X J9 AIP CONF PROC PY 1993 IS 283 BP 405 EP 417 PG 13 WC Computer Science, Information Systems; Remote Sensing SC Computer Science; Remote Sensing GA BA05N UT WOS:A1993BA05N00061 ER PT S AU HUGHES, JS LI, YP AF HUGHES, JS LI, YP BE Zygielbaum, A TI SCIENCE METADATA MANAGEMENT FOR THE PLANETARY DATA SYSTEM - THE MDIM DATA ENGINEERING DATABASE PROTOTYPE SO EARTH AND SPACE SCIENCE INFORMATION SYSTEMS SE AIP CONFERENCE PROCEEDINGS LA English DT Proceedings Paper CT International Space Year Conference on Earth and Space Science Information Systems CY FEB 10-13, 1992 CL PASADENA, CA C1 JET PROP LAB,ARCH PROD ENGN GRP,PASADENA,CA 91109. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AIP PRESS PI WOODBURY PA AMERICAN INSTITUTE OF PHYSICS 500 SUNNYSIDE BOULEVARD, WOODBURY, NY 11797-2999 SN 0094-243X BN 1-56396-094-X J9 AIP CONF PROC PY 1993 IS 283 BP 427 EP 435 PG 9 WC Computer Science, Information Systems; Remote Sensing SC Computer Science; Remote Sensing GA BA05N UT WOS:A1993BA05N00063 ER PT S AU MILLER, J AF MILLER, J BE Zygielbaum, A TI MANAGING THE MAGELLAN DATA SET SO EARTH AND SPACE SCIENCE INFORMATION SYSTEMS SE AIP CONFERENCE PROCEEDINGS LA English DT Proceedings Paper CT International Space Year Conference on Earth and Space Science Information Systems CY FEB 10-13, 1992 CL PASADENA, CA C1 JET PROP LAB,PASADENA,CA 91109. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AIP PRESS PI WOODBURY PA AMERICAN INSTITUTE OF PHYSICS 500 SUNNYSIDE BOULEVARD, WOODBURY, NY 11797-2999 SN 0094-243X BN 1-56396-094-X J9 AIP CONF PROC PY 1993 IS 283 BP 483 EP 487 PG 5 WC Computer Science, Information Systems; Remote Sensing SC Computer Science; Remote Sensing GA BA05N UT WOS:A1993BA05N00070 ER PT S AU SCOTT, JF AF SCOTT, JF BE Zygielbaum, A TI THE DISTRIBUTION OF MAGELLAN VENUS RADAR DATA SO EARTH AND SPACE SCIENCE INFORMATION SYSTEMS SE AIP CONFERENCE PROCEEDINGS LA English DT Proceedings Paper CT International Space Year Conference on Earth and Space Science Information Systems CY FEB 10-13, 1992 CL PASADENA, CA C1 JET PROP LAB,PASADENA,CA 91109. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AIP PRESS PI WOODBURY PA AMERICAN INSTITUTE OF PHYSICS 500 SUNNYSIDE BOULEVARD, WOODBURY, NY 11797-2999 SN 0094-243X BN 1-56396-094-X J9 AIP CONF PROC PY 1993 IS 283 BP 511 EP 512 PG 2 WC Computer Science, Information Systems; Remote Sensing SC Computer Science; Remote Sensing GA BA05N UT WOS:A1993BA05N00075 ER PT S AU CHIEN, S KANDT, RK DOYLE, R RODEN, J KING, T JOY, S AF CHIEN, S KANDT, RK DOYLE, R RODEN, J KING, T JOY, S BE Zygielbaum, A TI PIPE - AN INTELLIGENT SCIENTIFIC-DATA PREPARATION ASSISTANT SO EARTH AND SPACE SCIENCE INFORMATION SYSTEMS SE AIP CONFERENCE PROCEEDINGS LA English DT Proceedings Paper CT International Space Year Conference on Earth and Space Science Information Systems CY FEB 10-13, 1992 CL PASADENA, CA C1 JET PROP LAB,PASADENA,CA 91109. NR 0 TC 0 Z9 0 U1 0 U2 1 PU AIP PRESS PI WOODBURY PA AMERICAN INSTITUTE OF PHYSICS 500 SUNNYSIDE BOULEVARD, WOODBURY, NY 11797-2999 SN 0094-243X BN 1-56396-094-X J9 AIP CONF PROC PY 1993 IS 283 BP 539 EP 549 PG 11 WC Computer Science, Information Systems; Remote Sensing SC Computer Science; Remote Sensing GA BA05N UT WOS:A1993BA05N00078 ER PT S AU CHILDS, DB AF CHILDS, DB BE Zygielbaum, A TI DATA ARCHITECTURE AND THE DATA ARCHITECT SO EARTH AND SPACE SCIENCE INFORMATION SYSTEMS SE AIP CONFERENCE PROCEEDINGS LA English DT Proceedings Paper CT International Space Year Conference on Earth and Space Science Information Systems CY FEB 10-13, 1992 CL PASADENA, CA C1 JET PROP LAB,ARCH PROD ENGN GRP,PASADENA,CA 91109. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AIP PRESS PI WOODBURY PA AMERICAN INSTITUTE OF PHYSICS 500 SUNNYSIDE BOULEVARD, WOODBURY, NY 11797-2999 SN 0094-243X BN 1-56396-094-X J9 AIP CONF PROC PY 1993 IS 283 BP 550 EP 564 PG 15 WC Computer Science, Information Systems; Remote Sensing SC Computer Science; Remote Sensing GA BA05N UT WOS:A1993BA05N00079 ER PT S AU CRIBBS, MA DOBINSON, ER AF CRIBBS, MA DOBINSON, ER BE Zygielbaum, A TI IS THE MEDIUM THE MANAGEMENT - DISTRIBUTED DATA AND ITS CHALLENGE TO CENTRALIZED CATALOGING SO EARTH AND SPACE SCIENCE INFORMATION SYSTEMS SE AIP CONFERENCE PROCEEDINGS LA English DT Proceedings Paper CT International Space Year Conference on Earth and Space Science Information Systems CY FEB 10-13, 1992 CL PASADENA, CA C1 JET PROP LAB,PASADENA,CA 91109. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AIP PRESS PI WOODBURY PA AMERICAN INSTITUTE OF PHYSICS 500 SUNNYSIDE BOULEVARD, WOODBURY, NY 11797-2999 SN 0094-243X BN 1-56396-094-X J9 AIP CONF PROC PY 1993 IS 283 BP 581 EP 585 PG 5 WC Computer Science, Information Systems; Remote Sensing SC Computer Science; Remote Sensing GA BA05N UT WOS:A1993BA05N00082 ER PT S AU CROMP, RF CAMPBELL, WJ SHORT, NM AF CROMP, RF CAMPBELL, WJ SHORT, NM BE Zygielbaum, A TI AN INTELLIGENT INFORMATION FUSION SYSTEM FOR HANDLING THE ARCHIVING AND QUERYING OF TERABYTE-SIZED SPATIAL DATABASES SO EARTH AND SPACE SCIENCE INFORMATION SYSTEMS SE AIP CONFERENCE PROCEEDINGS LA English DT Proceedings Paper CT International Space Year Conference on Earth and Space Science Information Systems CY FEB 10-13, 1992 CL PASADENA, CA C1 NASA,GODDARD SPACE FLIGHT CTR,INFORMAT SCI & TECHNOL OFF,GREENBELT,MD 20771. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AIP PRESS PI WOODBURY PA AMERICAN INSTITUTE OF PHYSICS 500 SUNNYSIDE BOULEVARD, WOODBURY, NY 11797-2999 SN 0094-243X BN 1-56396-094-X J9 AIP CONF PROC PY 1993 IS 283 BP 586 EP 597 PG 12 WC Computer Science, Information Systems; Remote Sensing SC Computer Science; Remote Sensing GA BA05N UT WOS:A1993BA05N00083 ER PT S AU HANDLEY, TH LI, YP AF HANDLEY, TH LI, YP BE Zygielbaum, A TI DATAHUB - KNOWLEDGE-BASED DATA MANAGEMENT FOR DATA DISCOVERY SO EARTH AND SPACE SCIENCE INFORMATION SYSTEMS SE AIP CONFERENCE PROCEEDINGS LA English DT Proceedings Paper CT International Space Year Conference on Earth and Space Science Information Systems CY FEB 10-13, 1992 CL PASADENA, CA C1 JET PROP LAB,PASADENA,CA 91109. NR 0 TC 0 Z9 0 U1 1 U2 1 PU AIP PRESS PI WOODBURY PA AMERICAN INSTITUTE OF PHYSICS 500 SUNNYSIDE BOULEVARD, WOODBURY, NY 11797-2999 SN 0094-243X BN 1-56396-094-X J9 AIP CONF PROC PY 1993 IS 283 BP 669 EP 682 PG 14 WC Computer Science, Information Systems; Remote Sensing SC Computer Science; Remote Sensing GA BA05N UT WOS:A1993BA05N00093 ER PT S AU HUFFMAN, DJ JEANE, SA AF HUFFMAN, DJ JEANE, SA BE Zygielbaum, A TI ATTAINING AND MAINTAINING DATA INTEGRITY WITH CONFIGURATION MANAGEMENT SO EARTH AND SPACE SCIENCE INFORMATION SYSTEMS SE AIP CONFERENCE PROCEEDINGS LA English DT Proceedings Paper CT International Space Year Conference on Earth and Space Science Information Systems CY FEB 10-13, 1992 CL PASADENA, CA C1 CALTECH,JET PROP LAB,PASADENA,CA 93021. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AIP PRESS PI WOODBURY PA AMERICAN INSTITUTE OF PHYSICS 500 SUNNYSIDE BOULEVARD, WOODBURY, NY 11797-2999 SN 0094-243X BN 1-56396-094-X J9 AIP CONF PROC PY 1993 IS 283 BP 684 EP 687 PG 4 WC Computer Science, Information Systems; Remote Sensing SC Computer Science; Remote Sensing GA BA05N UT WOS:A1993BA05N00094 ER PT S AU LI, PP CURKENDALL, DW AF LI, PP CURKENDALL, DW BE Zygielbaum, A TI PARALLEL 3-DIMENSIONAL PERSPECTIVE RENDERING SO EARTH AND SPACE SCIENCE INFORMATION SYSTEMS SE AIP CONFERENCE PROCEEDINGS LA English DT Proceedings Paper CT International Space Year Conference on Earth and Space Science Information Systems CY FEB 10-13, 1992 CL PASADENA, CA C1 JET PROP LAB,PASADENA,CA 91109. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AIP PRESS PI WOODBURY PA AMERICAN INSTITUTE OF PHYSICS 500 SUNNYSIDE BOULEVARD, WOODBURY, NY 11797-2999 SN 0094-243X BN 1-56396-094-X J9 AIP CONF PROC PY 1993 IS 283 BP 701 EP 701 PG 1 WC Computer Science, Information Systems; Remote Sensing SC Computer Science; Remote Sensing GA BA05N UT WOS:A1993BA05N00097 ER PT S AU MASLINE, R BECKMAN, B MAINLAND, N AF MASLINE, R BECKMAN, B MAINLAND, N BE Zygielbaum, A TI THE MORPHOLOGY OF SPACE SCIENCE DATA - IS THERE A MORPHOLOGY OF DATA THAT INTRINSICALLY SUPPORTS MULTIDISCIPLINARY SCIENCE SO EARTH AND SPACE SCIENCE INFORMATION SYSTEMS SE AIP CONFERENCE PROCEEDINGS LA English DT Proceedings Paper CT International Space Year Conference on Earth and Space Science Information Systems CY FEB 10-13, 1992 CL PASADENA, CA C1 JET PROP LAB,PASADENA,CA 91109. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AIP PRESS PI WOODBURY PA AMERICAN INSTITUTE OF PHYSICS 500 SUNNYSIDE BOULEVARD, WOODBURY, NY 11797-2999 SN 0094-243X BN 1-56396-094-X J9 AIP CONF PROC PY 1993 IS 283 BP 745 EP 760 PG 16 WC Computer Science, Information Systems; Remote Sensing SC Computer Science; Remote Sensing GA BA05N UT WOS:A1993BA05N00101 ER PT S AU SHACKELFORD, K MCKINNEY, K AF SHACKELFORD, K MCKINNEY, K BE Zygielbaum, A TI AN APPROACH TO DEVELOPING USER INTERFACES FOR SPACE SYSTEMS SO EARTH AND SPACE SCIENCE INFORMATION SYSTEMS SE AIP CONFERENCE PROCEEDINGS LA English DT Proceedings Paper CT International Space Year Conference on Earth and Space Science Information Systems CY FEB 10-13, 1992 CL PASADENA, CA C1 NASA,GEORGE C MARSHALL SPACE FLIGHT CTR,HUNTSVILLE,AL 35812. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AIP PRESS PI WOODBURY PA AMERICAN INSTITUTE OF PHYSICS 500 SUNNYSIDE BOULEVARD, WOODBURY, NY 11797-2999 SN 0094-243X BN 1-56396-094-X J9 AIP CONF PROC PY 1993 IS 283 BP 771 EP 778 PG 8 WC Computer Science, Information Systems; Remote Sensing SC Computer Science; Remote Sensing GA BA05N UT WOS:A1993BA05N00103 ER PT S AU PREHEIM, L AMY, L YOUNG, J AF PREHEIM, L AMY, L YOUNG, J BE Zygielbaum, A TI SYSTEM BUILDING-BLOCKS ONE APPROACH TO PRODUCING INTEROPERABLE, LONG-LIVED INFORMATION-SYSTEMS SO EARTH AND SPACE SCIENCE INFORMATION SYSTEMS SE AIP CONFERENCE PROCEEDINGS LA English DT Proceedings Paper CT International Space Year Conference on Earth and Space Science Information Systems CY FEB 10-13, 1992 CL PASADENA, CA C1 JET PROP LAB,PASADENA,CA 91109. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AIP PRESS PI WOODBURY PA AMERICAN INSTITUTE OF PHYSICS 500 SUNNYSIDE BOULEVARD, WOODBURY, NY 11797-2999 SN 0094-243X BN 1-56396-094-X J9 AIP CONF PROC PY 1993 IS 283 BP 800 EP 809 PG 10 WC Computer Science, Information Systems; Remote Sensing SC Computer Science; Remote Sensing GA BA05N UT WOS:A1993BA05N00107 ER PT S AU STEVENS, GH AF STEVENS, GH BE Zygielbaum, A TI DATA DISTRIBUTION SATELLITE SO EARTH AND SPACE SCIENCE INFORMATION SYSTEMS SE AIP CONFERENCE PROCEEDINGS LA English DT Proceedings Paper CT International Space Year Conference on Earth and Space Science Information Systems CY FEB 10-13, 1992 CL PASADENA, CA C1 NASA,LEWIS RES CTR,CLEVELAND,OH 44135. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AIP PRESS PI WOODBURY PA AMERICAN INSTITUTE OF PHYSICS 500 SUNNYSIDE BOULEVARD, WOODBURY, NY 11797-2999 SN 0094-243X BN 1-56396-094-X J9 AIP CONF PROC PY 1993 IS 283 BP 853 EP 869 PG 17 WC Computer Science, Information Systems; Remote Sensing SC Computer Science; Remote Sensing GA BA05N UT WOS:A1993BA05N00115 ER PT S AU THIEMAN, JR AF THIEMAN, JR BE Zygielbaum, A TI IDENTIFYING, ACCESSING, AND INTEROPERABLY USING EARTH AND SPACE SCIENCE INFORMATION-SYSTEMS SO EARTH AND SPACE SCIENCE INFORMATION SYSTEMS SE AIP CONFERENCE PROCEEDINGS LA English DT Proceedings Paper CT International Space Year Conference on Earth and Space Science Information Systems CY FEB 10-13, 1992 CL PASADENA, CA C1 NASA,GODDARD SPACE FLIGHT CTR,NATL SPACE SCI DATA CTR,GREENBELT,MD 20771. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AIP PRESS PI WOODBURY PA AMERICAN INSTITUTE OF PHYSICS 500 SUNNYSIDE BOULEVARD, WOODBURY, NY 11797-2999 SN 0094-243X BN 1-56396-094-X J9 AIP CONF PROC PY 1993 IS 283 BP 871 EP 883 PG 13 WC Computer Science, Information Systems; Remote Sensing SC Computer Science; Remote Sensing GA BA05N UT WOS:A1993BA05N00116 ER PT S AU TRUSZKOWSKI, W MOORE, M AF TRUSZKOWSKI, W MOORE, M BE Zygielbaum, A TI TOWARDS AN INFORMATION ECOLOGY SO EARTH AND SPACE SCIENCE INFORMATION SYSTEMS SE AIP CONFERENCE PROCEEDINGS LA English DT Proceedings Paper CT International Space Year Conference on Earth and Space Science Information Systems CY FEB 10-13, 1992 CL PASADENA, CA C1 NASA,GODDARD SPACE FLIGHT CTR,GREENBELT,MD 20771. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AIP PRESS PI WOODBURY PA AMERICAN INSTITUTE OF PHYSICS 500 SUNNYSIDE BOULEVARD, WOODBURY, NY 11797-2999 SN 0094-243X BN 1-56396-094-X J9 AIP CONF PROC PY 1993 IS 283 BP 884 EP 892 PG 9 WC Computer Science, Information Systems; Remote Sensing SC Computer Science; Remote Sensing GA BA05N UT WOS:A1993BA05N00117 ER PT S AU ZYGIELBAUM, AI AF ZYGIELBAUM, AI BE Zygielbaum, A TI AN OVERVIEW AND RESULTS FROM THE INTERNATIONAL SPACE YEAR CONFERENCE ON EARTH AND SPACE SCIENCE INFORMATION-SYSTEMS SO EARTH AND SPACE SCIENCE INFORMATION SYSTEMS SE AIP CONFERENCE PROCEEDINGS LA English DT Proceedings Paper CT International Space Year Conference on Earth and Space Science Information Systems CY FEB 10-13, 1992 CL PASADENA, CA C1 JET PROP LAB,PASADENA,CA 91109. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AIP PRESS PI WOODBURY PA AMERICAN INSTITUTE OF PHYSICS 500 SUNNYSIDE BOULEVARD, WOODBURY, NY 11797-2999 SN 0094-243X BN 1-56396-094-X J9 AIP CONF PROC PY 1993 IS 283 BP R15 EP R18 PG 4 WC Computer Science, Information Systems; Remote Sensing SC Computer Science; Remote Sensing GA BA05N UT WOS:A1993BA05N00001 ER PT J AU DAVIDSON, EA MATSON, PA VITOUSEK, PM RILEY, R DUNKIN, K GARCIAMENDEZ, G MAASS, JM AF DAVIDSON, EA MATSON, PA VITOUSEK, PM RILEY, R DUNKIN, K GARCIAMENDEZ, G MAASS, JM TI PROCESSES REGULATING SOIL EMISSIONS OF NO AND N2O IN A SEASONALLY DRY TROPICAL FOREST SO ECOLOGY LA English DT Article DE CHAMELA, MEXICO; DENITRIFICATION; DROUGHT DECIDUOUS; GREENHOUSE GAS; MINERALIZATION; N-15; NITRIC OXIDE; NITRIFICATION; NITROGEN CYCLE; NITROUS OXIDE; POOL DILUTION ID NITROUS-OXIDE; NITRIC-OXIDE; BIOGENIC EMISSIONS; FIELD-MEASUREMENTS; DENITRIFICATION; NITRIFICATION; SAVANNA; MEXICO; TRANSFORMATIONS; ACETYLENE AB While much is known about control of production of NO and N2O by nitrifying and denitrifying bacteria at the cellular level, application of this knowledge to field studies has not yielded unifying concepts that are widely applicable and that foster understanding of global sources of these atmospheric trace gases. We applied a simple conceptual model to the investigation of sources of NO and N2O and the environmental factors affecting fluxes in a drought-deciduous forest of Mexico. Fluxes of NO and N2O were higher in the wet season than the dry season, but addition of water to dry soil caused large pulses of CO2, NO, and N2O emissions. Immediate increases of extractable soil NH4+ and high rates of gross N mineralization and gross nitrification also were observed following wetting of dry soil. Soil NO2- had accumulated during the dry season, and that NO2- plus the pulse of increased soil NH4+ were mostly consumed within 24 hours of wetting. This dynamic microbial processing of soil inorganic N coincided with the pulses of NO and N2O production following wetting of dry soil. Acetylene inhibition experiments indicated that NO production was dependent on nitrification, that nitrification was the dominant source of N2O when the soil was wetted at the end of the dry season, and that denitrification might be an important source of N2O during the wet season. Post-wetting soil moisture was correlated negatively with NO fluxes and positively with N2O fluxes. These results support a conceptual model in which N trace gas production is generally constrained by the rates of N mineralization and nitrification, while the specific ratios of NO and N2O fluxes and the contributions from nitrifying and denitrifying bacteria are controlled largely by soil moisture. C1 STANFORD UNIV,DEPT BIOL,STANFORD,CA 94305. NASA,AMES RES CTR,MOFFETT FIELD,CA 94035. UNIV CALIF BERKELEY,DEPT SOIL SCI,BERKELEY,CA 94720. UNIV NACL AUTONOMA MEXICO,CTR ECOL,MEXICO CITY,DF,MEXICO. RI Davidson, Eric/K-4984-2013 OI Davidson, Eric/0000-0002-8525-8697 NR 42 TC 293 Z9 306 U1 6 U2 93 PU ECOLOGICAL SOC AMER PI WASHINGTON PA 2010 MASSACHUSETTS AVE, NW, STE 400, WASHINGTON, DC 20036 SN 0012-9658 J9 ECOLOGY JI Ecology PD JAN PY 1993 VL 74 IS 1 BP 130 EP 139 DI 10.2307/1939508 PG 10 WC Ecology SC Environmental Sciences & Ecology GA KF775 UT WOS:A1993KF77500014 ER PT B AU MOSER, RD ROGERS, MM AF MOSER, RD ROGERS, MM BE Bonnet, JP Glauser, MN TI COHERENT STRUCTURES IN A SIMULATED TURBULENT MIXING LAYER SO EDDY STRUCTURE IDENTIFICATION IN FREE TURBULENT SHEAR FLOWS SE FLUID MECHANICS AND ITS APPLICATIONS LA English DT Proceedings Paper CT IUTAM Symposium on Eddy Structure Identification in Free Turbulent Shear Flows CY OCT 12-14, 1992 CL POITIERS, FRANCE SP INT UNION THEORET & APPL MECH, AEROSPATIALE, ALLIANT COMP SYST FRANCE, BP RES, CEA, VAUJOURS, CNRS, DEPT VIENNE, EUROPEAN COMMUNITY FLOW TURBULENCE & COMBUST, MINIST DEF, MINIST RECH & ESPACE, NAT SCI FDN USA, REG POITOU CHARENTES, SILICON GRAPH FRANCE, UNIV POITIERS, UFR CTR EDUDES AERODYNAM & THERM, VILLE POITIERS C1 NASA,AMES RES CTR,MOFFETT FIELD,CA 94035. NR 0 TC 0 Z9 0 U1 0 U2 1 PU KLUWER ACADEMIC PUBL PI DORDRECHT PA PO BOX 17, 3300 AA DORDRECHT, NETHERLANDS BN 0-7923-2449-8 J9 FLUID MEC A PY 1993 VL 21 BP 415 EP 428 PG 14 WC Mechanics SC Mechanics GA BA26H UT WOS:A1993BA26H00034 ER PT B AU FEBVRE, P MCGRATH, WR BATELAAN, P LEDUC, HG BUMBLE, B FRERKING, MA HERNICHEL, J AF FEBVRE, P MCGRATH, WR BATELAAN, P LEDUC, HG BUMBLE, B FRERKING, MA HERNICHEL, J BE Birch, JR Parker, TJ TI PERFORMANCE OF AN SIS RECEIVER OVER 460 GHZ TO 640 GHZ USING SUBMICRON NB JUNCTIONS WITH INTEGRATED RF TUNING CIRCUITS SO EIGHTEENTH INTERNATIONAL CONFERENCE ON INFRARED AND MILLIMETER WAVES: CONFERENCE DIGEST SE PROCEEDINGS OF THE SOCIETY OF PHOTO-OPTICAL INSTRUMENTATION ENGINEERS (SPIE) LA English DT Proceedings Paper CT 18th International Conference on Infrared and Millimeter Waves CY SEP 06-10, 1993 CL UNIV ESSEX, COLCHESTER, ENGLAND SP SOC PHOTO OPT INSTRUMENTAT ENGINEERS HO UNIV ESSEX C1 JET PROP LAB,PASADENA,CA 91109. NR 0 TC 0 Z9 0 U1 0 U2 0 PU SPIE - INT SOC OPTICAL ENGINEERING PI BELLINGHAM PA PO BOX 10, BELLINGHAM, WA 98227-0010 BN 0-8194-1392-5 J9 P SOC PHOTO-OPT INS PY 1993 VL 2104 BP 263 EP 264 PG 2 WC Optics SC Optics GA BA03K UT WOS:A1993BA03K00122 ER PT B AU PEREZ, R AF PEREZ, R GP EOS/ESD ASSOC TI ELECTROSTATIC DISCHARGE ANALYSES FOR SPACECRAFT IN GEOSYNCHRONOUS ORBIT SO ELECTRICAL OVERSTRESS/ELECTROSTATIC DISCHARGE SYMPOSIUM 1993 LA English DT Proceedings Paper CT 1993 Electrical Overstress/Electrostatic Discharge Symposium CY SEP 28-30, 1993 CL LAKE BUENA VISTA, FL SP EOS ESD ASSOC, IEEE C1 JET PROP LAB,PASADENA,CA 91109. NR 0 TC 0 Z9 0 U1 0 U2 0 PU EOS/ESD ASSOC PI ROME PA 201 MILL STREET, ROME, NY 13440 BN 1-878303-39-2 PY 1993 BP 29 EP 34 PG 6 WC Engineering, Electrical & Electronic SC Engineering GA BA40Q UT WOS:A1993BA40Q00005 ER PT B AU HANSEN, IG KENNY, BH AF HANSEN, IG KENNY, BH GP AMER CHEM SOC TI SPECIFICATION AND TESTING FOR POWER BY WIRE AIRCRAFT SO ENERGY ENVIRONMENT ECONOMICS: 28TH INTERSOCIETY ENERGY CONVERSION ENGINEERING CONFERENCE (IECEC-93), VOL 1: AEROSPACE POWER, CONVERSION TECHNOLOGY, ELECTROCHEMICAL CONVERSION LA English DT Proceedings Paper CT 28th Intersociety Energy Conversion Engineering Conference (IECEC-93) CY AUG 08-13, 1993 CL ATLANTA, GA SP AMER CHEM SOC, AMER INST AERONAUT & ASTRONAUT, AMER SOC MECH ENGINEERS, IEEE, AMER INST CHEM ENGINEERS, AMER NUCL SOC, SOC AUTOMOT ENGINEERS C1 NASA,LEWIS RES CTR,CLEVELAND,OH 44135. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 SIXTEENTH ST NW, WASHINGTON, DC 20036 BN 0-8412-2772-5 PY 1993 BP 13 EP 18 PG 6 WC Engineering, Aerospace; Energy & Fuels; Engineering, Mechanical; Nuclear Science & Technology SC Engineering; Energy & Fuels; Nuclear Science & Technology GA BZ61S UT WOS:A1993BZ61S00003 ER PT B AU DUGALWHITEHEAD, NR AF DUGALWHITEHEAD, NR GP AMER CHEM SOC TI THE CONTINUING DEVELOPMENT OF POWER-SYSTEM AUTOMATION KNOWLEDGE SO ENERGY ENVIRONMENT ECONOMICS: 28TH INTERSOCIETY ENERGY CONVERSION ENGINEERING CONFERENCE (IECEC-93), VOL 1: AEROSPACE POWER, CONVERSION TECHNOLOGY, ELECTROCHEMICAL CONVERSION LA English DT Proceedings Paper CT 28th Intersociety Energy Conversion Engineering Conference (IECEC-93) CY AUG 08-13, 1993 CL ATLANTA, GA SP AMER CHEM SOC, AMER INST AERONAUT & ASTRONAUT, AMER SOC MECH ENGINEERS, IEEE, AMER INST CHEM ENGINEERS, AMER NUCL SOC, SOC AUTOMOT ENGINEERS C1 NASA,GEORGE C MARSHALL SPACE FLIGHT CTR,DIV ELECT POWER SYST,POWER SYST BRANCH,HUNTSVILLE,AL 35812. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 SIXTEENTH ST NW, WASHINGTON, DC 20036 BN 0-8412-2772-5 PY 1993 BP 25 EP 30 PG 6 WC Engineering, Aerospace; Energy & Fuels; Engineering, Mechanical; Nuclear Science & Technology SC Engineering; Energy & Fuels; Nuclear Science & Technology GA BZ61S UT WOS:A1993BZ61S00005 ER PT B AU RINGER, MJ AF RINGER, MJ GP AMER CHEM SOC TI INTEGRATING SCHEDULING AND BATTERY MANAGEMENT SO ENERGY ENVIRONMENT ECONOMICS: 28TH INTERSOCIETY ENERGY CONVERSION ENGINEERING CONFERENCE (IECEC-93), VOL 1: AEROSPACE POWER, CONVERSION TECHNOLOGY, ELECTROCHEMICAL CONVERSION LA English DT Proceedings Paper CT 28th Intersociety Energy Conversion Engineering Conference (IECEC-93) CY AUG 08-13, 1993 CL ATLANTA, GA SP AMER CHEM SOC, AMER INST AERONAUT & ASTRONAUT, AMER SOC MECH ENGINEERS, IEEE, AMER INST CHEM ENGINEERS, AMER NUCL SOC, SOC AUTOMOT ENGINEERS C1 NASA,LEWIS RES CTR GRP,SVERDRUP TECHNOL INC,BROOKPARK,OH 44142. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 SIXTEENTH ST NW, WASHINGTON, DC 20036 BN 0-8412-2772-5 PY 1993 BP 43 EP 48 PG 6 WC Engineering, Aerospace; Energy & Fuels; Engineering, Mechanical; Nuclear Science & Technology SC Engineering; Energy & Fuels; Nuclear Science & Technology GA BZ61S UT WOS:A1993BZ61S00008 ER PT B AU WHITT, TH BREWER, JC AF WHITT, TH BREWER, JC GP AMER CHEM SOC TI HUBBLE-SPACE-TELESCOPE NICKEL-HYDROGEN BATTERY TESTING - AN UPDATE SO ENERGY ENVIRONMENT ECONOMICS: 28TH INTERSOCIETY ENERGY CONVERSION ENGINEERING CONFERENCE (IECEC-93), VOL 1: AEROSPACE POWER, CONVERSION TECHNOLOGY, ELECTROCHEMICAL CONVERSION LA English DT Proceedings Paper CT 28th Intersociety Energy Conversion Engineering Conference (IECEC-93) CY AUG 08-13, 1993 CL ATLANTA, GA SP AMER CHEM SOC, AMER INST AERONAUT & ASTRONAUT, AMER SOC MECH ENGINEERS, IEEE, AMER INST CHEM ENGINEERS, AMER NUCL SOC, SOC AUTOMOT ENGINEERS C1 NASA,GEORGE C MARSHALL SPACE FLIGHT CTR,POWER SYST BRANCH EB72,HUNTSVILLE,AL 35812. NR 0 TC 0 Z9 0 U1 0 U2 1 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 SIXTEENTH ST NW, WASHINGTON, DC 20036 BN 0-8412-2772-5 PY 1993 BP 125 EP 130 PG 6 WC Engineering, Aerospace; Energy & Fuels; Engineering, Mechanical; Nuclear Science & Technology SC Engineering; Energy & Fuels; Nuclear Science & Technology GA BZ61S UT WOS:A1993BZ61S00021 ER PT B AU BREWER, JC WHITT, TH AF BREWER, JC WHITT, TH GP AMER CHEM SOC TI A STUDY OF THE EFFECTS OF RECONDITIONING ON NICKEL-HYDROGEN CELLS SO ENERGY ENVIRONMENT ECONOMICS: 28TH INTERSOCIETY ENERGY CONVERSION ENGINEERING CONFERENCE (IECEC-93), VOL 1: AEROSPACE POWER, CONVERSION TECHNOLOGY, ELECTROCHEMICAL CONVERSION LA English DT Proceedings Paper CT 28th Intersociety Energy Conversion Engineering Conference (IECEC-93) CY AUG 08-13, 1993 CL ATLANTA, GA SP AMER CHEM SOC, AMER INST AERONAUT & ASTRONAUT, AMER SOC MECH ENGINEERS, IEEE, AMER INST CHEM ENGINEERS, AMER NUCL SOC, SOC AUTOMOT ENGINEERS C1 NASA,GEORGE C MARSHALL SPACE FLIGHT CTR,HUNTSVILLE,AL 35812. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 SIXTEENTH ST NW, WASHINGTON, DC 20036 BN 0-8412-2772-5 PY 1993 BP 137 EP 141 PG 5 WC Engineering, Aerospace; Energy & Fuels; Engineering, Mechanical; Nuclear Science & Technology SC Engineering; Energy & Fuels; Nuclear Science & Technology GA BZ61S UT WOS:A1993BZ61S00023 ER PT B AU TIMMERMAN, PJ AF TIMMERMAN, PJ GP AMER CHEM SOC TI NI-CD BATTERY PERFORMANCE MODELING - AN UPDATE SO ENERGY ENVIRONMENT ECONOMICS: 28TH INTERSOCIETY ENERGY CONVERSION ENGINEERING CONFERENCE (IECEC-93), VOL 1: AEROSPACE POWER, CONVERSION TECHNOLOGY, ELECTROCHEMICAL CONVERSION LA English DT Proceedings Paper CT 28th Intersociety Energy Conversion Engineering Conference (IECEC-93) CY AUG 08-13, 1993 CL ATLANTA, GA SP AMER CHEM SOC, AMER INST AERONAUT & ASTRONAUT, AMER SOC MECH ENGINEERS, IEEE, AMER INST CHEM ENGINEERS, AMER NUCL SOC, SOC AUTOMOT ENGINEERS C1 JET PROP LAB,PASADENA,CA 91109. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 SIXTEENTH ST NW, WASHINGTON, DC 20036 BN 0-8412-2772-5 PY 1993 BP 165 EP 170 PG 6 WC Engineering, Aerospace; Energy & Fuels; Engineering, Mechanical; Nuclear Science & Technology SC Engineering; Energy & Fuels; Nuclear Science & Technology GA BZ61S UT WOS:A1993BZ61S00028 ER PT B AU DELIGIANNIS, F DISTEFANO, S HALPERT, G AF DELIGIANNIS, F DISTEFANO, S HALPERT, G GP AMER CHEM SOC TI TOPEX POSEIDON BATTERY PERFORMANCE AND MANAGEMENT-TECHNIQUES SO ENERGY ENVIRONMENT ECONOMICS: 28TH INTERSOCIETY ENERGY CONVERSION ENGINEERING CONFERENCE (IECEC-93), VOL 1: AEROSPACE POWER, CONVERSION TECHNOLOGY, ELECTROCHEMICAL CONVERSION LA English DT Proceedings Paper CT 28th Intersociety Energy Conversion Engineering Conference (IECEC-93) CY AUG 08-13, 1993 CL ATLANTA, GA SP AMER CHEM SOC, AMER INST AERONAUT & ASTRONAUT, AMER SOC MECH ENGINEERS, IEEE, AMER INST CHEM ENGINEERS, AMER NUCL SOC, SOC AUTOMOT ENGINEERS C1 JET PROP LAB,ENERGY STORAGE SYST GRP,PASADENA,CA 91109. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 SIXTEENTH ST NW, WASHINGTON, DC 20036 BN 0-8412-2772-5 PY 1993 BP 171 EP 177 PG 7 WC Engineering, Aerospace; Energy & Fuels; Engineering, Mechanical; Nuclear Science & Technology SC Engineering; Energy & Fuels; Nuclear Science & Technology GA BZ61S UT WOS:A1993BZ61S00029 ER PT B AU DISTEFANO, S PERRONE, D NAUMAN, R HALPERT, G ANDERMAN, M AF DISTEFANO, S PERRONE, D NAUMAN, R HALPERT, G ANDERMAN, M GP AMER CHEM SOC TI LEO CYCLING PERFORMANCE OF NICD PASTED FIBER PLATE CELLS SO ENERGY ENVIRONMENT ECONOMICS: 28TH INTERSOCIETY ENERGY CONVERSION ENGINEERING CONFERENCE (IECEC-93), VOL 1: AEROSPACE POWER, CONVERSION TECHNOLOGY, ELECTROCHEMICAL CONVERSION LA English DT Proceedings Paper CT 28th Intersociety Energy Conversion Engineering Conference (IECEC-93) CY AUG 08-13, 1993 CL ATLANTA, GA SP AMER CHEM SOC, AMER INST AERONAUT & ASTRONAUT, AMER SOC MECH ENGINEERS, IEEE, AMER INST CHEM ENGINEERS, AMER NUCL SOC, SOC AUTOMOT ENGINEERS C1 JET PROP LAB,PASADENA,CA 91109. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 SIXTEENTH ST NW, WASHINGTON, DC 20036 BN 0-8412-2772-5 PY 1993 BP 179 EP 184 PG 6 WC Engineering, Aerospace; Energy & Fuels; Engineering, Mechanical; Nuclear Science & Technology SC Engineering; Energy & Fuels; Nuclear Science & Technology GA BZ61S UT WOS:A1993BZ61S00030 ER PT B AU ALLEVATO, CE VINING, CB AF ALLEVATO, CE VINING, CB GP AMER CHEM SOC TI THERMOELECTRIC PROPERTIES OF SEMICONDUCTING IRIDIUM SILICIDES SO ENERGY ENVIRONMENT ECONOMICS: 28TH INTERSOCIETY ENERGY CONVERSION ENGINEERING CONFERENCE (IECEC-93), VOL 1: AEROSPACE POWER, CONVERSION TECHNOLOGY, ELECTROCHEMICAL CONVERSION LA English DT Proceedings Paper CT 28th Intersociety Energy Conversion Engineering Conference (IECEC-93) CY AUG 08-13, 1993 CL ATLANTA, GA SP AMER CHEM SOC, AMER INST AERONAUT & ASTRONAUT, AMER SOC MECH ENGINEERS, IEEE, AMER INST CHEM ENGINEERS, AMER NUCL SOC, SOC AUTOMOT ENGINEERS C1 JET PROP LAB,PASADENA,CA 91109. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 SIXTEENTH ST NW, WASHINGTON, DC 20036 BN 0-8412-2772-5 PY 1993 BP 239 EP 243 PG 5 WC Engineering, Aerospace; Energy & Fuels; Engineering, Mechanical; Nuclear Science & Technology SC Engineering; Energy & Fuels; Nuclear Science & Technology GA BZ61S UT WOS:A1993BZ61S00038 ER PT B AU CAILLAT, T BORSHCHEVSKY, A FLEURIAL, JP AF CAILLAT, T BORSHCHEVSKY, A FLEURIAL, JP GP AMER CHEM SOC TI INVESTIGATIONS OF SEVERAL NEW ADVANCED THERMOELECTRIC-MATERIALS AT THE JET-PROPULSION-LABORATORY SO ENERGY ENVIRONMENT ECONOMICS: 28TH INTERSOCIETY ENERGY CONVERSION ENGINEERING CONFERENCE (IECEC-93), VOL 1: AEROSPACE POWER, CONVERSION TECHNOLOGY, ELECTROCHEMICAL CONVERSION LA English DT Proceedings Paper CT 28th Intersociety Energy Conversion Engineering Conference (IECEC-93) CY AUG 08-13, 1993 CL ATLANTA, GA SP AMER CHEM SOC, AMER INST AERONAUT & ASTRONAUT, AMER SOC MECH ENGINEERS, IEEE, AMER INST CHEM ENGINEERS, AMER NUCL SOC, SOC AUTOMOT ENGINEERS C1 JET PROP LAB,PASADENA,CA 91109. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 SIXTEENTH ST NW, WASHINGTON, DC 20036 BN 0-8412-2772-5 PY 1993 BP 245 EP 248 PG 4 WC Engineering, Aerospace; Energy & Fuels; Engineering, Mechanical; Nuclear Science & Technology SC Engineering; Energy & Fuels; Nuclear Science & Technology GA BZ61S UT WOS:A1993BZ61S00039 ER PT B AU KRAUTHAMER, S DAS, R WHITE, J ROGERS, D NIERAETH, D STELL, C AF KRAUTHAMER, S DAS, R WHITE, J ROGERS, D NIERAETH, D STELL, C GP AMER CHEM SOC TI HIGH-PERFORMANCE POWER CONVERTERS FOR SATURN-BOUND CASSINI SPACECRAFT SO ENERGY ENVIRONMENT ECONOMICS: 28TH INTERSOCIETY ENERGY CONVERSION ENGINEERING CONFERENCE (IECEC-93), VOL 1: AEROSPACE POWER, CONVERSION TECHNOLOGY, ELECTROCHEMICAL CONVERSION LA English DT Proceedings Paper CT 28th Intersociety Energy Conversion Engineering Conference (IECEC-93) CY AUG 08-13, 1993 CL ATLANTA, GA SP AMER CHEM SOC, AMER INST AERONAUT & ASTRONAUT, AMER SOC MECH ENGINEERS, IEEE, AMER INST CHEM ENGINEERS, AMER NUCL SOC, SOC AUTOMOT ENGINEERS C1 JET PROP LAB,POWER ELECTR GRP,PASADENA,CA 91109. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 SIXTEENTH ST NW, WASHINGTON, DC 20036 BN 0-8412-2772-5 PY 1993 BP 260 EP 265 PG 6 WC Engineering, Aerospace; Energy & Fuels; Engineering, Mechanical; Nuclear Science & Technology SC Engineering; Energy & Fuels; Nuclear Science & Technology GA BZ61S UT WOS:A1993BZ61S00042 ER PT B AU KRAUTHAMER, S DAS, RSL FRISBEE, RH AF KRAUTHAMER, S DAS, RSL FRISBEE, RH GP AMER CHEM SOC TI POWER PROCESSING UNITS FOR HIGH-POWERED SOLAR ELECTRIC PROPULSION USING MPD THRUSTERS SO ENERGY ENVIRONMENT ECONOMICS: 28TH INTERSOCIETY ENERGY CONVERSION ENGINEERING CONFERENCE (IECEC-93), VOL 1: AEROSPACE POWER, CONVERSION TECHNOLOGY, ELECTROCHEMICAL CONVERSION LA English DT Proceedings Paper CT 28th Intersociety Energy Conversion Engineering Conference (IECEC-93) CY AUG 08-13, 1993 CL ATLANTA, GA SP AMER CHEM SOC, AMER INST AERONAUT & ASTRONAUT, AMER SOC MECH ENGINEERS, IEEE, AMER INST CHEM ENGINEERS, AMER NUCL SOC, SOC AUTOMOT ENGINEERS C1 JET PROP LAB,PASADENA,CA 91109. NR 0 TC 0 Z9 0 U1 0 U2 1 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 SIXTEENTH ST NW, WASHINGTON, DC 20036 BN 0-8412-2772-5 PY 1993 BP 285 EP 290 PG 6 WC Engineering, Aerospace; Energy & Fuels; Engineering, Mechanical; Nuclear Science & Technology SC Engineering; Energy & Fuels; Nuclear Science & Technology GA BZ61S UT WOS:A1993BZ61S00046 ER PT B AU PURVIS, CK AF PURVIS, CK GP AMER CHEM SOC TI ENVIRONMENTS WORKBENCH ANALYSIS OF ON-ORBIT FLOATING POTENTIALS OF SPACE STATION FREEDOM SO ENERGY ENVIRONMENT ECONOMICS: 28TH INTERSOCIETY ENERGY CONVERSION ENGINEERING CONFERENCE (IECEC-93), VOL 1: AEROSPACE POWER, CONVERSION TECHNOLOGY, ELECTROCHEMICAL CONVERSION LA English DT Proceedings Paper CT 28th Intersociety Energy Conversion Engineering Conference (IECEC-93) CY AUG 08-13, 1993 CL ATLANTA, GA SP AMER CHEM SOC, AMER INST AERONAUT & ASTRONAUT, AMER SOC MECH ENGINEERS, IEEE, AMER INST CHEM ENGINEERS, AMER NUCL SOC, SOC AUTOMOT ENGINEERS C1 NASA,LEWIS RES CTR,CLEVELAND,OH 44135. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 SIXTEENTH ST NW, WASHINGTON, DC 20036 BN 0-8412-2772-5 PY 1993 BP 303 EP 308 PG 6 WC Engineering, Aerospace; Energy & Fuels; Engineering, Mechanical; Nuclear Science & Technology SC Engineering; Energy & Fuels; Nuclear Science & Technology GA BZ61S UT WOS:A1993BZ61S00049 ER PT B AU CLARK, KB AF CLARK, KB GP AMER CHEM SOC TI CASSINI POWER MANAGEMENT AND DISTRIBUTION SO ENERGY ENVIRONMENT ECONOMICS: 28TH INTERSOCIETY ENERGY CONVERSION ENGINEERING CONFERENCE (IECEC-93), VOL 1: AEROSPACE POWER, CONVERSION TECHNOLOGY, ELECTROCHEMICAL CONVERSION LA English DT Proceedings Paper CT 28th Intersociety Energy Conversion Engineering Conference (IECEC-93) CY AUG 08-13, 1993 CL ATLANTA, GA SP AMER CHEM SOC, AMER INST AERONAUT & ASTRONAUT, AMER SOC MECH ENGINEERS, IEEE, AMER INST CHEM ENGINEERS, AMER NUCL SOC, SOC AUTOMOT ENGINEERS C1 JET PROP LAB,POWER SYST ENGN & CONTROL GRP,PASADENA,CA 91109. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 SIXTEENTH ST NW, WASHINGTON, DC 20036 BN 0-8412-2772-5 PY 1993 BP 397 EP 402 PG 6 WC Engineering, Aerospace; Energy & Fuels; Engineering, Mechanical; Nuclear Science & Technology SC Engineering; Energy & Fuels; Nuclear Science & Technology GA BZ61S UT WOS:A1993BZ61S00064 ER PT B AU UNDERWOOD, ML SHIRBACHEH, M AF UNDERWOOD, ML SHIRBACHEH, M GP AMER CHEM SOC TI A POWER SUBSYSTEM FOR A PLUTO FAST FLYBY MISSION SO ENERGY ENVIRONMENT ECONOMICS: 28TH INTERSOCIETY ENERGY CONVERSION ENGINEERING CONFERENCE (IECEC-93), VOL 1: AEROSPACE POWER, CONVERSION TECHNOLOGY, ELECTROCHEMICAL CONVERSION LA English DT Proceedings Paper CT 28th Intersociety Energy Conversion Engineering Conference (IECEC-93) CY AUG 08-13, 1993 CL ATLANTA, GA SP AMER CHEM SOC, AMER INST AERONAUT & ASTRONAUT, AMER SOC MECH ENGINEERS, IEEE, AMER INST CHEM ENGINEERS, AMER NUCL SOC, SOC AUTOMOT ENGINEERS C1 JET PROP LAB,PASADENA,CA 91109. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 SIXTEENTH ST NW, WASHINGTON, DC 20036 BN 0-8412-2772-5 PY 1993 BP 409 EP 413 PG 5 WC Engineering, Aerospace; Energy & Fuels; Engineering, Mechanical; Nuclear Science & Technology SC Engineering; Energy & Fuels; Nuclear Science & Technology GA BZ61S UT WOS:A1993BZ61S00066 ER PT B AU AHMAD, AJ SMITH, HL RODRIGUEZ, GE JALLICE, D GADDY, E AF AHMAD, AJ SMITH, HL RODRIGUEZ, GE JALLICE, D GADDY, E GP AMER CHEM SOC TI THE X-RAY TIMING EXPLORER (XTE) POWER-SYSTEM SO ENERGY ENVIRONMENT ECONOMICS: 28TH INTERSOCIETY ENERGY CONVERSION ENGINEERING CONFERENCE (IECEC-93), VOL 1: AEROSPACE POWER, CONVERSION TECHNOLOGY, ELECTROCHEMICAL CONVERSION LA English DT Proceedings Paper CT 28th Intersociety Energy Conversion Engineering Conference (IECEC-93) CY AUG 08-13, 1993 CL ATLANTA, GA SP AMER CHEM SOC, AMER INST AERONAUT & ASTRONAUT, AMER SOC MECH ENGINEERS, IEEE, AMER INST CHEM ENGINEERS, AMER NUCL SOC, SOC AUTOMOT ENGINEERS C1 NASA,GODDARD SPACE FLIGHT CTR,GREENBELT,MD 20771. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 SIXTEENTH ST NW, WASHINGTON, DC 20036 BN 0-8412-2772-5 PY 1993 BP 414 EP 419 PG 6 WC Engineering, Aerospace; Energy & Fuels; Engineering, Mechanical; Nuclear Science & Technology SC Engineering; Energy & Fuels; Nuclear Science & Technology GA BZ61S UT WOS:A1993BZ61S00067 ER PT B AU CATALDO, RL SEFCIK, RJ AF CATALDO, RL SEFCIK, RJ GP AMER CHEM SOC TI LIFE-CYCLE COST - A CONSIDERATION FOR SELECTION OF ADVANCED POWER-SYSTEMS SO ENERGY ENVIRONMENT ECONOMICS: 28TH INTERSOCIETY ENERGY CONVERSION ENGINEERING CONFERENCE (IECEC-93), VOL 1: AEROSPACE POWER, CONVERSION TECHNOLOGY, ELECTROCHEMICAL CONVERSION LA English DT Proceedings Paper CT 28th Intersociety Energy Conversion Engineering Conference (IECEC-93) CY AUG 08-13, 1993 CL ATLANTA, GA SP AMER CHEM SOC, AMER INST AERONAUT & ASTRONAUT, AMER SOC MECH ENGINEERS, IEEE, AMER INST CHEM ENGINEERS, AMER NUCL SOC, SOC AUTOMOT ENGINEERS C1 NASA,LEWIS RES CTR,CLEVELAND,OH 44135. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 SIXTEENTH ST NW, WASHINGTON, DC 20036 BN 0-8412-2772-5 PY 1993 BP 457 EP 462 PG 6 WC Engineering, Aerospace; Energy & Fuels; Engineering, Mechanical; Nuclear Science & Technology SC Engineering; Energy & Fuels; Nuclear Science & Technology GA BZ61S UT WOS:A1993BZ61S00072 ER PT B AU BENNETT, GL AF BENNETT, GL GP AMER CHEM SOC TI ANALYZING THE UNITED-NATIONS PRINCIPLES ON THE USE OF NUCLEAR-POWER SOURCES IN OUTER-SPACE SO ENERGY ENVIRONMENT ECONOMICS: 28TH INTERSOCIETY ENERGY CONVERSION ENGINEERING CONFERENCE (IECEC-93), VOL 1: AEROSPACE POWER, CONVERSION TECHNOLOGY, ELECTROCHEMICAL CONVERSION LA English DT Proceedings Paper CT 28th Intersociety Energy Conversion Engineering Conference (IECEC-93) CY AUG 08-13, 1993 CL ATLANTA, GA SP AMER CHEM SOC, AMER INST AERONAUT & ASTRONAUT, AMER SOC MECH ENGINEERS, IEEE, AMER INST CHEM ENGINEERS, AMER NUCL SOC, SOC AUTOMOT ENGINEERS C1 NASA,WASHINGTON,DC 20546. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 SIXTEENTH ST NW, WASHINGTON, DC 20036 BN 0-8412-2772-5 PY 1993 BP 481 EP 486 PG 6 WC Engineering, Aerospace; Energy & Fuels; Engineering, Mechanical; Nuclear Science & Technology SC Engineering; Energy & Fuels; Nuclear Science & Technology GA BZ61S UT WOS:A1993BZ61S00076 ER PT B AU BENNETT, GL DOHERTY, MP MILLER, TJ BROPHY, JR FRISBEE, RH STOCKY, JF AF BENNETT, GL DOHERTY, MP MILLER, TJ BROPHY, JR FRISBEE, RH STOCKY, JF GP AMER CHEM SOC TI THE NASA PROGRAM ON NUCLEAR ELECTRIC PROPULSION - PREPARING FOR THE FUTURE SO ENERGY ENVIRONMENT ECONOMICS: 28TH INTERSOCIETY ENERGY CONVERSION ENGINEERING CONFERENCE (IECEC-93), VOL 1: AEROSPACE POWER, CONVERSION TECHNOLOGY, ELECTROCHEMICAL CONVERSION LA English DT Proceedings Paper CT 28th Intersociety Energy Conversion Engineering Conference (IECEC-93) CY AUG 08-13, 1993 CL ATLANTA, GA SP AMER CHEM SOC, AMER INST AERONAUT & ASTRONAUT, AMER SOC MECH ENGINEERS, IEEE, AMER INST CHEM ENGINEERS, AMER NUCL SOC, SOC AUTOMOT ENGINEERS C1 NASA,WASHINGTON,DC 20546. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 SIXTEENTH ST NW, WASHINGTON, DC 20036 BN 0-8412-2772-5 PY 1993 BP 581 EP 586 PG 6 WC Engineering, Aerospace; Energy & Fuels; Engineering, Mechanical; Nuclear Science & Technology SC Engineering; Energy & Fuels; Nuclear Science & Technology GA BZ61S UT WOS:A1993BZ61S00092 ER PT B AU BENNETT, GL AF BENNETT, GL GP AMER CHEM SOC TI MANAGING FOR SUCCESS - EXAMPLES AND OBSERVATIONS FROM THE GPHS-RTG PROGRAM SO ENERGY ENVIRONMENT ECONOMICS: 28TH INTERSOCIETY ENERGY CONVERSION ENGINEERING CONFERENCE (IECEC-93), VOL 1: AEROSPACE POWER, CONVERSION TECHNOLOGY, ELECTROCHEMICAL CONVERSION LA English DT Proceedings Paper CT 28th Intersociety Energy Conversion Engineering Conference (IECEC-93) CY AUG 08-13, 1993 CL ATLANTA, GA SP AMER CHEM SOC, AMER INST AERONAUT & ASTRONAUT, AMER SOC MECH ENGINEERS, IEEE, AMER INST CHEM ENGINEERS, AMER NUCL SOC, SOC AUTOMOT ENGINEERS C1 NASA,WASHINGTON,DC 20546. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 SIXTEENTH ST NW, WASHINGTON, DC 20036 BN 0-8412-2772-5 PY 1993 BP 649 EP 654 PG 6 WC Engineering, Aerospace; Energy & Fuels; Engineering, Mechanical; Nuclear Science & Technology SC Engineering; Energy & Fuels; Nuclear Science & Technology GA BZ61S UT WOS:A1993BZ61S00103 ER PT B AU BENNETT, GL HOWARD, RJ PILCHER, CB SMITH, WL STETSON, DS AF BENNETT, GL HOWARD, RJ PILCHER, CB SMITH, WL STETSON, DS GP AMER CHEM SOC TI THE NASA SPACE POWER PROGRAM - A TIME OF TRANSITION SO ENERGY ENVIRONMENT ECONOMICS: 28TH INTERSOCIETY ENERGY CONVERSION ENGINEERING CONFERENCE (IECEC-93), VOL 1: AEROSPACE POWER, CONVERSION TECHNOLOGY, ELECTROCHEMICAL CONVERSION LA English DT Proceedings Paper CT 28th Intersociety Energy Conversion Engineering Conference (IECEC-93) CY AUG 08-13, 1993 CL ATLANTA, GA SP AMER CHEM SOC, AMER INST AERONAUT & ASTRONAUT, AMER SOC MECH ENGINEERS, IEEE, AMER INST CHEM ENGINEERS, AMER NUCL SOC, SOC AUTOMOT ENGINEERS C1 NASA,WASHINGTON,DC 20546. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 SIXTEENTH ST NW, WASHINGTON, DC 20036 BN 0-8412-2772-5 PY 1993 BP 661 EP 666 PG 6 WC Engineering, Aerospace; Energy & Fuels; Engineering, Mechanical; Nuclear Science & Technology SC Engineering; Energy & Fuels; Nuclear Science & Technology GA BZ61S UT WOS:A1993BZ61S00105 ER PT B AU SMITH, WL AF SMITH, WL GP AMER CHEM SOC TI EXPLORATION MISSION POWER REQUIREMENTS AND ISSUES SO ENERGY ENVIRONMENT ECONOMICS: 28TH INTERSOCIETY ENERGY CONVERSION ENGINEERING CONFERENCE (IECEC-93), VOL 1: AEROSPACE POWER, CONVERSION TECHNOLOGY, ELECTROCHEMICAL CONVERSION LA English DT Proceedings Paper CT 28th Intersociety Energy Conversion Engineering Conference (IECEC-93) CY AUG 08-13, 1993 CL ATLANTA, GA SP AMER CHEM SOC, AMER INST AERONAUT & ASTRONAUT, AMER SOC MECH ENGINEERS, IEEE, AMER INST CHEM ENGINEERS, AMER NUCL SOC, SOC AUTOMOT ENGINEERS C1 NASA HEADQUARTERS,OFF EXPLORAT,WASHINGTON,DC 20546. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 SIXTEENTH ST NW, WASHINGTON, DC 20036 BN 0-8412-2772-5 PY 1993 BP 671 EP 673 PG 3 WC Engineering, Aerospace; Energy & Fuels; Engineering, Mechanical; Nuclear Science & Technology SC Engineering; Energy & Fuels; Nuclear Science & Technology GA BZ61S UT WOS:A1993BZ61S00107 ER PT B AU RYAN, MA KISOR, A WILLIAMS, RM JEFFRIESNAKAMURA, B UNDERWOOD, ML OCONNOR, D AF RYAN, MA KISOR, A WILLIAMS, RM JEFFRIESNAKAMURA, B UNDERWOOD, ML OCONNOR, D GP AMER CHEM SOC TI EMISSIVITIES AND THERMAL CHARACTERIZATION OF COMPONENTS FOR AMTEC CELLS SO ENERGY ENVIRONMENT ECONOMICS: 28TH INTERSOCIETY ENERGY CONVERSION ENGINEERING CONFERENCE (IECEC-93), VOL 1: AEROSPACE POWER, CONVERSION TECHNOLOGY, ELECTROCHEMICAL CONVERSION LA English DT Proceedings Paper CT 28th Intersociety Energy Conversion Engineering Conference (IECEC-93) CY AUG 08-13, 1993 CL ATLANTA, GA SP AMER CHEM SOC, AMER INST AERONAUT & ASTRONAUT, AMER SOC MECH ENGINEERS, IEEE, AMER INST CHEM ENGINEERS, AMER NUCL SOC, SOC AUTOMOT ENGINEERS C1 JET PROP LAB,PASADENA,CA 91109. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 SIXTEENTH ST NW, WASHINGTON, DC 20036 BN 0-8412-2772-5 PY 1993 BP 815 EP 818 PG 4 WC Engineering, Aerospace; Energy & Fuels; Engineering, Mechanical; Nuclear Science & Technology SC Engineering; Energy & Fuels; Nuclear Science & Technology GA BZ61S UT WOS:A1993BZ61S00127 ER PT B AU WILLIAMS, RM JEFFRIESNAKAMURA, B RYAN, MA UNDERWOOD, ML KISOR, A OCONNOR, D KIKKERT, S AF WILLIAMS, RM JEFFRIESNAKAMURA, B RYAN, MA UNDERWOOD, ML KISOR, A OCONNOR, D KIKKERT, S GP AMER CHEM SOC TI ADVANCES IN STUDIES OF ELECTRODE-KINETICS AND MASS-TRANSPORT IN AMTEC CELLS SO ENERGY ENVIRONMENT ECONOMICS: 28TH INTERSOCIETY ENERGY CONVERSION ENGINEERING CONFERENCE (IECEC-93), VOL 1: AEROSPACE POWER, CONVERSION TECHNOLOGY, ELECTROCHEMICAL CONVERSION LA English DT Proceedings Paper CT 28th Intersociety Energy Conversion Engineering Conference (IECEC-93) CY AUG 08-13, 1993 CL ATLANTA, GA SP AMER CHEM SOC, AMER INST AERONAUT & ASTRONAUT, AMER SOC MECH ENGINEERS, IEEE, AMER INST CHEM ENGINEERS, AMER NUCL SOC, SOC AUTOMOT ENGINEERS C1 JET PROP LAB,PASADENA,CA 91109. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 SIXTEENTH ST NW, WASHINGTON, DC 20036 BN 0-8412-2772-5 PY 1993 BP 819 EP 822 PG 4 WC Engineering, Aerospace; Energy & Fuels; Engineering, Mechanical; Nuclear Science & Technology SC Engineering; Energy & Fuels; Nuclear Science & Technology GA BZ61S UT WOS:A1993BZ61S00128 ER PT B AU UNDERWOOD, ML SUITOR, JW WILLIAMS, RM RYAN, MA JEFFRIESNAKAMURA, B OCONNOR, D AF UNDERWOOD, ML SUITOR, JW WILLIAMS, RM RYAN, MA JEFFRIESNAKAMURA, B OCONNOR, D GP AMER CHEM SOC TI A 5 VOLT AMTEC MULTICELL SO ENERGY ENVIRONMENT ECONOMICS: 28TH INTERSOCIETY ENERGY CONVERSION ENGINEERING CONFERENCE (IECEC-93), VOL 1: AEROSPACE POWER, CONVERSION TECHNOLOGY, ELECTROCHEMICAL CONVERSION LA English DT Proceedings Paper CT 28th Intersociety Energy Conversion Engineering Conference (IECEC-93) CY AUG 08-13, 1993 CL ATLANTA, GA SP AMER CHEM SOC, AMER INST AERONAUT & ASTRONAUT, AMER SOC MECH ENGINEERS, IEEE, AMER INST CHEM ENGINEERS, AMER NUCL SOC, SOC AUTOMOT ENGINEERS C1 JET PROP LAB,PASADENA,CA 91109. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 SIXTEENTH ST NW, WASHINGTON, DC 20036 BN 0-8412-2772-5 PY 1993 BP 855 EP 859 PG 5 WC Engineering, Aerospace; Energy & Fuels; Engineering, Mechanical; Nuclear Science & Technology SC Engineering; Energy & Fuels; Nuclear Science & Technology GA BZ61S UT WOS:A1993BZ61S00134 ER PT B AU WILLIAMS, RM JEFFRIESNAKAMURA, B RYAN, MA UNDERWOOD, ML SUITOR, J OCONNOR, D AF WILLIAMS, RM JEFFRIESNAKAMURA, B RYAN, MA UNDERWOOD, ML SUITOR, J OCONNOR, D GP AMER CHEM SOC TI COMPONENT SELECTION, ACCELERATED TESTING, AND IMPROVED MODELING OF AMTEC SYSTEMS FOR SPACE POWER SO ENERGY ENVIRONMENT ECONOMICS: 28TH INTERSOCIETY ENERGY CONVERSION ENGINEERING CONFERENCE (IECEC-93), VOL 1: AEROSPACE POWER, CONVERSION TECHNOLOGY, ELECTROCHEMICAL CONVERSION LA English DT Proceedings Paper CT 28th Intersociety Energy Conversion Engineering Conference (IECEC-93) CY AUG 08-13, 1993 CL ATLANTA, GA SP AMER CHEM SOC, AMER INST AERONAUT & ASTRONAUT, AMER SOC MECH ENGINEERS, IEEE, AMER INST CHEM ENGINEERS, AMER NUCL SOC, SOC AUTOMOT ENGINEERS C1 JET PROP LAB,PASADENA,CA 91109. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 SIXTEENTH ST NW, WASHINGTON, DC 20036 BN 0-8412-2772-5 PY 1993 BP 867 EP 871 PG 5 WC Engineering, Aerospace; Energy & Fuels; Engineering, Mechanical; Nuclear Science & Technology SC Engineering; Energy & Fuels; Nuclear Science & Technology GA BZ61S UT WOS:A1993BZ61S00136 ER PT B AU BURGER, DR EWELL, RC AF BURGER, DR EWELL, RC GP AMER CHEM SOC TI LOW-BANDGAP THERMOPHOTOVOLTAIC SYSTEM-DESIGN SO ENERGY ENVIRONMENT ECONOMICS: 28TH INTERSOCIETY ENERGY CONVERSION ENGINEERING CONFERENCE (IECEC-93), VOL 1: AEROSPACE POWER, CONVERSION TECHNOLOGY, ELECTROCHEMICAL CONVERSION LA English DT Proceedings Paper CT 28th Intersociety Energy Conversion Engineering Conference (IECEC-93) CY AUG 08-13, 1993 CL ATLANTA, GA SP AMER CHEM SOC, AMER INST AERONAUT & ASTRONAUT, AMER SOC MECH ENGINEERS, IEEE, AMER INST CHEM ENGINEERS, AMER NUCL SOC, SOC AUTOMOT ENGINEERS C1 JET PROP LAB,PASADENA,CA 91109. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 SIXTEENTH ST NW, WASHINGTON, DC 20036 BN 0-8412-2772-5 PY 1993 BP 1045 EP 1049 PG 5 WC Engineering, Aerospace; Energy & Fuels; Engineering, Mechanical; Nuclear Science & Technology SC Engineering; Energy & Fuels; Nuclear Science & Technology GA BZ61S UT WOS:A1993BZ61S00164 ER PT B AU BENNETT, GL AF BENNETT, GL GP AMER CHEM SOC TI THE PATHOLOGICAL SCIENCE SYNDROME - A CONCERN FOR ENERGY SCIENCE SO ENERGY ENVIRONMENT ECONOMICS: 28TH INTERSOCIETY ENERGY CONVERSION ENGINEERING CONFERENCE PROCEEDINGS (IECEC-93), VOL 2: ENVIRONMENTAL IMPACT, ENERGY SYSTEMS, NEW TECHNOLOGY FOR ENERGY UTILIZATION, POLICY ISSUES, RENEWABLE ENERGY SOURCES, STIRLING CYCLES LA English DT Proceedings Paper CT 28th Intersociety Energy Conversion Engineering Conference (IECEC-93) CY AUG 08-13, 1993 CL ATLANTA, GA SP AMER CHEM SOC, AMER INST AERONAUT & ASTRONAUT, AMER SOC MECH ENGINEERS, IEEE, AMER INST CHEM ENGINEERS, AMER NUCL SOC, SOC AUTOMOT ENGINEERS C1 NASA,WASHINGTON,DC 20546. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 SIXTEENTH ST NW, WASHINGTON, DC 20036 BN 0-8412-2772-5 PY 1993 BP 335 EP 340 PG 6 WC Engineering, Aerospace; Energy & Fuels; Engineering, Mechanical; Environmental Sciences SC Engineering; Energy & Fuels; Environmental Sciences & Ecology GA BZ61T UT WOS:A1993BZ61T00053 ER PT B AU CAIRELLI, JE GENG, SM WONG, WA SWEC, DM DOEBERLING, TJ MADI, FJ VORA, DC AF CAIRELLI, JE GENG, SM WONG, WA SWEC, DM DOEBERLING, TJ MADI, FJ VORA, DC GP AMER CHEM SOC TI 1993 UPDATE ON RESULTS OF SPRE TESTING AT NASA-LEWIS SO ENERGY ENVIRONMENT ECONOMICS: 28TH INTERSOCIETY ENERGY CONVERSION ENGINEERING CONFERENCE PROCEEDINGS (IECEC-93), VOL 2: ENVIRONMENTAL IMPACT, ENERGY SYSTEMS, NEW TECHNOLOGY FOR ENERGY UTILIZATION, POLICY ISSUES, RENEWABLE ENERGY SOURCES, STIRLING CYCLES LA English DT Proceedings Paper CT 28th Intersociety Energy Conversion Engineering Conference (IECEC-93) CY AUG 08-13, 1993 CL ATLANTA, GA SP AMER CHEM SOC, AMER INST AERONAUT & ASTRONAUT, AMER SOC MECH ENGINEERS, IEEE, AMER INST CHEM ENGINEERS, AMER NUCL SOC, SOC AUTOMOT ENGINEERS C1 NASA,LEWIS RES CTR,CLEVELAND,OH 44135. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 SIXTEENTH ST NW, WASHINGTON, DC 20036 BN 0-8412-2772-5 PY 1993 BP 633 EP 638 PG 6 WC Engineering, Aerospace; Energy & Fuels; Engineering, Mechanical; Environmental Sciences SC Engineering; Energy & Fuels; Environmental Sciences & Ecology GA BZ61T UT WOS:A1993BZ61T00099 ER PT B AU WINSLOW, C AF WINSLOW, C GP AMER CHEM SOC TI HUBBLE-SPACE-TELESCOPE SOLAR ARRAY-2 FLIGHT SERVICING READINESS SO ENERGY ENVIRONMENT ECONOMICS: 28TH INTERSOCIETY ENERGY CONVERSION ENGINEERING CONFERENCE PROCEEDINGS (IECEC-93), VOL 2: ENVIRONMENTAL IMPACT, ENERGY SYSTEMS, NEW TECHNOLOGY FOR ENERGY UTILIZATION, POLICY ISSUES, RENEWABLE ENERGY SOURCES, STIRLING CYCLES LA English DT Proceedings Paper CT 28th Intersociety Energy Conversion Engineering Conference (IECEC-93) CY AUG 08-13, 1993 CL ATLANTA, GA SP AMER CHEM SOC, AMER INST AERONAUT & ASTRONAUT, AMER SOC MECH ENGINEERS, IEEE, AMER INST CHEM ENGINEERS, AMER NUCL SOC, SOC AUTOMOT ENGINEERS C1 NASA,GODDARD SPACE FLIGHT CTR,LOCKHEED TECH OPERAT CO,GREENBELT,MD 20771. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 SIXTEENTH ST NW, WASHINGTON, DC 20036 BN 0-8412-2772-5 PY 1993 BP 819 EP 824 PG 6 WC Engineering, Aerospace; Energy & Fuels; Engineering, Mechanical; Environmental Sciences SC Engineering; Energy & Fuels; Environmental Sciences & Ecology GA BZ61T UT WOS:A1993BZ61T00130 ER PT B AU SHALTENS, RK BOYLE, RV AF SHALTENS, RK BOYLE, RV GP AMER CHEM SOC TI OVERVIEW OF THE SOLAR DYNAMIC GROUND TEST DEMONSTRATION PROGRAM SO ENERGY ENVIRONMENT ECONOMICS: 28TH INTERSOCIETY ENERGY CONVERSION ENGINEERING CONFERENCE PROCEEDINGS (IECEC-93), VOL 2: ENVIRONMENTAL IMPACT, ENERGY SYSTEMS, NEW TECHNOLOGY FOR ENERGY UTILIZATION, POLICY ISSUES, RENEWABLE ENERGY SOURCES, STIRLING CYCLES LA English DT Proceedings Paper CT 28th Intersociety Energy Conversion Engineering Conference (IECEC-93) CY AUG 08-13, 1993 CL ATLANTA, GA SP AMER CHEM SOC, AMER INST AERONAUT & ASTRONAUT, AMER SOC MECH ENGINEERS, IEEE, AMER INST CHEM ENGINEERS, AMER NUCL SOC, SOC AUTOMOT ENGINEERS C1 NASA,LEWIS RES CTR,CLEVELAND,OH 44135. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 SIXTEENTH ST NW, WASHINGTON, DC 20036 BN 0-8412-2772-5 PY 1993 BP 831 EP 836 PG 6 WC Engineering, Aerospace; Energy & Fuels; Engineering, Mechanical; Environmental Sciences SC Engineering; Energy & Fuels; Environmental Sciences & Ecology GA BZ61T UT WOS:A1993BZ61T00132 ER PT B AU KERSLAKE, TW HOJNICKI, JS GREEN, RD FOLLO, JC AF KERSLAKE, TW HOJNICKI, JS GREEN, RD FOLLO, JC GP AMER CHEM SOC TI SYSTEM PERFORMANCE PREDICTIONS FOR SPACE STATION FREEDOMS ELECTRICAL-POWER SYSTEM SO ENERGY ENVIRONMENT ECONOMICS: 28TH INTERSOCIETY ENERGY CONVERSION ENGINEERING CONFERENCE PROCEEDINGS (IECEC-93), VOL 2: ENVIRONMENTAL IMPACT, ENERGY SYSTEMS, NEW TECHNOLOGY FOR ENERGY UTILIZATION, POLICY ISSUES, RENEWABLE ENERGY SOURCES, STIRLING CYCLES LA English DT Proceedings Paper CT 28th Intersociety Energy Conversion Engineering Conference (IECEC-93) CY AUG 08-13, 1993 CL ATLANTA, GA SP AMER CHEM SOC, AMER INST AERONAUT & ASTRONAUT, AMER SOC MECH ENGINEERS, IEEE, AMER INST CHEM ENGINEERS, AMER NUCL SOC, SOC AUTOMOT ENGINEERS C1 NASA,LEWIS RES CTR,CLEVELAND,OH 44135. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 SIXTEENTH ST NW, WASHINGTON, DC 20036 BN 0-8412-2772-5 PY 1993 BP 863 EP 868 PG 6 WC Engineering, Aerospace; Energy & Fuels; Engineering, Mechanical; Environmental Sciences SC Engineering; Energy & Fuels; Environmental Sciences & Ecology GA BZ61T UT WOS:A1993BZ61T00137 ER PT B AU HOJNICKI, JS GREEN, RD KERSLAKE, TW MCKISSOCK, DB TRUDELL, JJ AF HOJNICKI, JS GREEN, RD KERSLAKE, TW MCKISSOCK, DB TRUDELL, JJ GP AMER CHEM SOC TI SPACE STATION FREEDOM ELECTRICAL PERFORMANCE-MODEL SO ENERGY ENVIRONMENT ECONOMICS: 28TH INTERSOCIETY ENERGY CONVERSION ENGINEERING CONFERENCE PROCEEDINGS (IECEC-93), VOL 2: ENVIRONMENTAL IMPACT, ENERGY SYSTEMS, NEW TECHNOLOGY FOR ENERGY UTILIZATION, POLICY ISSUES, RENEWABLE ENERGY SOURCES, STIRLING CYCLES LA English DT Proceedings Paper CT 28th Intersociety Energy Conversion Engineering Conference (IECEC-93) CY AUG 08-13, 1993 CL ATLANTA, GA SP AMER CHEM SOC, AMER INST AERONAUT & ASTRONAUT, AMER SOC MECH ENGINEERS, IEEE, AMER INST CHEM ENGINEERS, AMER NUCL SOC, SOC AUTOMOT ENGINEERS C1 NASA,LEWIS RES CTR,CLEVELAND,OH 44135. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 SIXTEENTH ST NW, WASHINGTON, DC 20036 BN 0-8412-2772-5 PY 1993 BP 869 EP 874 PG 6 WC Engineering, Aerospace; Energy & Fuels; Engineering, Mechanical; Environmental Sciences SC Engineering; Energy & Fuels; Environmental Sciences & Ecology GA BZ61T UT WOS:A1993BZ61T00138 ER PT B AU KANKAM, MD RAUCH, JS AF KANKAM, MD RAUCH, JS GP AMER CHEM SOC TI CONTROLLABILITY OF FREE-PISTON STIRLING ENGINE LINEAR ALTERNATOR DRIVING A DYNAMIC LOAD SO ENERGY ENVIRONMENT ECONOMICS: 28TH INTERSOCIETY ENERGY CONVERSION ENGINEERING CONFERENCE PROCEEDINGS (IECEC-93), VOL 2: ENVIRONMENTAL IMPACT, ENERGY SYSTEMS, NEW TECHNOLOGY FOR ENERGY UTILIZATION, POLICY ISSUES, RENEWABLE ENERGY SOURCES, STIRLING CYCLES LA English DT Proceedings Paper CT 28th Intersociety Energy Conversion Engineering Conference (IECEC-93) CY AUG 08-13, 1993 CL ATLANTA, GA SP AMER CHEM SOC, AMER INST AERONAUT & ASTRONAUT, AMER SOC MECH ENGINEERS, IEEE, AMER INST CHEM ENGINEERS, AMER NUCL SOC, SOC AUTOMOT ENGINEERS C1 NASA,LEWIS RES CTR,CLEVELAND,OH 44135. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 SIXTEENTH ST NW, WASHINGTON, DC 20036 BN 0-8412-2772-5 PY 1993 BP 937 EP 943 PG 7 WC Engineering, Aerospace; Energy & Fuels; Engineering, Mechanical; Environmental Sciences SC Engineering; Energy & Fuels; Environmental Sciences & Ecology GA BZ61T UT WOS:A1993BZ61T00149 ER PT J AU YATES, EC AF YATES, EC TI INTEGRAL-EQUATION METHODS IN STEADY AND UNSTEADY SUBSONIC, TRANSONIC, AND SUPERSONIC AERODYNAMICS FOR INTERDISCIPLINARY DESIGN SO ENGINEERING ANALYSIS WITH BOUNDARY ELEMENTS LA English DT Article DE BOUNDARY ELEMENTS METHOD; AERODYNAMICS; COMPUTER-AIDED-DESIGN AB This paper reviews the NASA Langley Research Center program for development of integral-equation aerodynamic methods with emphasis on application in computer-aided multidisciplinary design processes as well as in aerodynamic design and stand-alone analysis. The accomplishments, status, and outlook of the program are discussed in order to highlight the scope, generality, versatility, and attractive features of this methodology. RP YATES, EC (reprint author), NASA,LANGLEY RES CTR,HAMPTON,VA 23665, USA. NR 38 TC 0 Z9 0 U1 0 U2 0 PU ELSEVIER SCI LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, OXON, ENGLAND OX5 1GB SN 0955-7997 J9 ENG ANAL BOUND ELEM JI Eng. Anal. Bound. Elem. PY 1993 VL 12 IS 3 BP 175 EP 184 PG 10 WC Engineering, Multidisciplinary; Mathematics, Interdisciplinary Applications SC Engineering; Mathematics GA NB343 UT WOS:A1993NB34300003 ER PT B AU BENNETT, CL BOGGESS, NW HAUSER, MG MATHER, JC SMOOT, GF WRIGHT, EL AF BENNETT, CL BOGGESS, NW HAUSER, MG MATHER, JC SMOOT, GF WRIGHT, EL BE Shull, JM Thronson, HA TI RECENT RESULTS FROM COBE SO ENVIRONMENT AND EVOLUTION OF GALAXIES SE ASTROPHYSICS AND SPACE SCIENCE LIBRARY LA English DT Proceedings Paper CT Third Tetons Summer School on the Environment and Evolution of Galaxies (Tetons III) CY JUL, 1992 CL GRAND TETON NATL PK, WY SP UNIV COLORADO, UNIV WYOMING C1 NASA,GODDARD SPACE FLIGHT CTR,ASTRON & SOLAR PHYS LAB,GREENBELT,MD 20771. NR 0 TC 2 Z9 2 U1 0 U2 0 PU KLUWER ACADEMIC PUBL PI DORDRECHT PA PO BOX 17, 3300 AA DORDRECHT, NETHERLANDS BN 0-7923-2541-9 J9 ASTROPHYS SPACE SC L PY 1993 VL 188 BP 27 EP 58 PG 32 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA BZ72F UT WOS:A1993BZ72F00002 ER PT B AU MUSHOTZKY, R AF MUSHOTZKY, R BE Shull, JM Thronson, HA TI COOLING FLOWS IN CLUSTERS OF GALAXIES SO ENVIRONMENT AND EVOLUTION OF GALAXIES SE ASTROPHYSICS AND SPACE SCIENCE LIBRARY LA English DT Proceedings Paper CT Third Tetons Summer School on the Environment and Evolution of Galaxies (Tetons III) CY JUL, 1992 CL GRAND TETON NATL PK, WY SP UNIV COLORADO, UNIV WYOMING C1 NASA,GODDARD SPACE FLIGHT CTR,HIGH ENERGY ASTROPHYS LAB,GREENBELT,MD 20771. NR 0 TC 3 Z9 3 U1 0 U2 0 PU KLUWER ACADEMIC PUBL PI DORDRECHT PA PO BOX 17, 3300 AA DORDRECHT, NETHERLANDS BN 0-7923-2541-9 J9 ASTROPHYS SPACE SC L PY 1993 VL 188 BP 383 EP 408 PG 26 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA BZ72F UT WOS:A1993BZ72F00022 ER PT S AU YUNCK, TP AF YUNCK, TP BE Jones, AV TI COPING WITH THE ATMOSPHERE AND IONOSPHERE IN PRECISE SATELLITE AND GROUND POSITIONING SO ENVIRONMENTAL EFFECTS ON SPACECRAFT POSITIONING AND TRAJECTORIES SE GEOPHYSICAL MONOGRAPH SERIES LA English DT Proceedings Paper CT 20th General Assembly of the International Union of Geodesy and Geophysics: Environmental Effects on Spacecraft Positioning and Trajectories CY AUG, 1991 CL VIENNA, AUSTRIA SP INT UNION GEODESY & GEOPHYS C1 JET PROP LAB,PASADENA,CA 91109. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER GEOPHYSICAL UNION PI WASHINGTON PA 2000 FLORIDA AVE NW, WASHINGTON, DC 20009 SN 0065-8448 BN 0-87590-464-5 J9 GEOPH MONOG SERIES PY 1993 VL 73 BP 1 EP 16 PG 16 WC Geosciences, Multidisciplinary; Meteorology & Atmospheric Sciences SC Geology; Meteorology & Atmospheric Sciences GA BA19Q UT WOS:A1993BA19Q00001 ER PT J AU DRINKWATER, MR LONG, DG EARLY, DS AF DRINKWATER, MR LONG, DG EARLY, DS TI ENHANCED-RESOLUTION ERS-1 SCATTEROMETER IMAGING OF SOUTHERN-OCEAN SEA-ICE SO ESA JOURNAL-EUROPEAN SPACE AGENCY LA English DT Article ID SAR BACKSCATTER SIGNATURES AB A new method of image reconstruction is described which allows enhanced-resolution images to be produced from gridded C-band scatterometer data from the Active Microwave Instrument (AMI) carried by ESA's ERS-1 satellite. Resulting images are weekly averages which improve the nominal resolution of 50 km to an enhanced resolution of approximately 14 km. Time-integrated images are maps of the mean radar-backscatter coefficient normalised to 40-degrees incidence. Such medium-scale images are derived for application to mapping the dynamics of the Southern-Ocean sea-ice cover. These all-weather day and night images may be derived in regions of the globe from AMI scatterometer-mode data where higher resolution (25 m) AMI SAR image data are unavailable due to the lack of a local SAR receiving station, or during periods when the receiving station is closed. Results demonstrate that this enhanced-resolution imaging technique applied to the scatterometer mode of the AMI complements and considerably enhances the lower frequency temporal and spatial coverage of high-resolution SAR images in the Antarctic. C1 BRIGHAM YOUNG UNIV,DEPT ELECT & COMP ENGN,PROVO,UT 84602. RP DRINKWATER, MR (reprint author), JET PROP LAB,PASADENA,CA 91109, USA. RI Long, David/K-4908-2015; OI Long, David/0000-0002-1852-3972; Drinkwater, Mark/0000-0002-9250-3806 NR 9 TC 19 Z9 20 U1 0 U2 1 PU EUROPEAN SPACE AGENCY PI NOORDWIJK PA ESTEC, PO BOX 299, 2200 AG NOORDWIJK, NETHERLANDS SN 0379-2285 J9 ESA J-EUR SPACE AGEN PY 1993 VL 17 IS 4 BP 307 EP 322 PG 16 WC Engineering, Aerospace SC Engineering GA NC965 UT WOS:A1993NC96500003 ER PT J AU FREED, AD WALKER, KP AF FREED, AD WALKER, KP TI RATCHETTING BEHAVIOR IN VISCOPLASTICITY - A TECHNICAL NOTE SO EUROPEAN JOURNAL OF MECHANICS A-SOLIDS LA English DT Note ID STRESS AB Viscoplastic models that use the [Armstrong & Frederick, 1966] kinematic hardening relationship are known to generally overpredict the observed accumulation of ratchet strains [Inoue et al., 1991]. The reason for this behavior is a consequence of the mathematics used to describe Hooke's law and the evolution equations for plastic strain and back stress. Conditions for ratchetting exist whenever there is a cycle-averaged mean stress present over a cyclic loading path. In a laboratory, two types of controlled loading paths are usually studied. Cyclic relaxation is the ratchet mechanism associated with displacement (strain) control, while cyclic creep is the ratchet mechanism associated with load (stress) control. Overcoming the possible adverse trends in predicted ratchetting behavior is a difficult task, and how one ought to go about doing this is not yet completely clear. We therefore choose to discuss the mathematical cause of ratchetting and how it has been dealt with to date in the literature, but we make no attempt to correct this flaw. C1 ENGN SCI SOFTWARE INC,SMITHFIELD,RI 02917. RP FREED, AD (reprint author), NASA,LEWIS RES CTR,CLEVELAND,OH 44135, USA. NR 16 TC 2 Z9 2 U1 0 U2 0 PU GAUTHIER-VILLARS PI PARIS PA S P E S-JOURNAL DEPT, 120 BD ST GERMAIN, F-75006 PARIS, FRANCE SN 0997-7538 J9 EUR J MECH A-SOLID JI Eur. J. Mech. A-Solids PY 1993 VL 12 IS 2 BP 191 EP 196 PG 6 WC Mechanics SC Mechanics GA LD601 UT WOS:A1993LD60100002 ER PT B AU RAMSEY, BD AUSTIN, RA MINAMITANI, T WEISSKOPF, MC GRINDLAY, JE LUM, KSK MANANDHAR, RP AF RAMSEY, BD AUSTIN, RA MINAMITANI, T WEISSKOPF, MC GRINDLAY, JE LUM, KSK MANANDHAR, RP BE Siegmund, OHW TI A HYBRID GAS DETECTOR PHOSWICH FOR HARD X-RAY ASTRONOMY SO EUV, X-RAY, AND GAMMA-RAY INSTRUMENTATION FOR ASTRONOMY IV SE PROCEEDINGS OF THE SOCIETY OF PHOTO-OPTICAL INSTRUMENTATION ENGINEERS (SPIE) LA English DT Proceedings Paper CT Conference on EUV, X-Ray, and Gamma-Ray Instrumentation for Astronomy IV CY JUL 11-12, 1993 CL SAN DIEGO, CA SP SOC PHOTO OPT INSTRUMENTAT ENGINEERS C1 NASA,GEORGE C MARSHALL SPACE FLIGHT CTR,SPACE SCI LAB,HUNTSVILLE,AL 35812. NR 0 TC 1 Z9 1 U1 0 U2 0 PU SPIE - INT SOC OPTICAL ENGINEERING PI BELLINGHAM PA PO BOX 10, BELLINGHAM, WA 98227-0010 BN 0-8194-1255-4 J9 P SOC PHOTO-OPT INS PY 1993 VL 2006 BP 90 EP 96 DI 10.1117/12.162821 PG 7 WC Astronomy & Astrophysics; Instruments & Instrumentation; Optics SC Astronomy & Astrophysics; Instruments & Instrumentation; Optics GA BZ57B UT WOS:A1993BZ57B00010 ER PT B AU RAMSEY, BD APPLE, JA DIETZ, K WEISSKOPF, MC AUSTIN, R KOLODZIEJCZAK, J MINAMITANI, T AF RAMSEY, BD APPLE, JA DIETZ, K WEISSKOPF, MC AUSTIN, R KOLODZIEJCZAK, J MINAMITANI, T BE Siegmund, OHW TI THE MARSHALL SPACE-FLIGHT CENTER IMAGING X-RAY EXPERIMENT (MIXE) SO EUV, X-RAY, AND GAMMA-RAY INSTRUMENTATION FOR ASTRONOMY IV SE PROCEEDINGS OF THE SOCIETY OF PHOTO-OPTICAL INSTRUMENTATION ENGINEERS (SPIE) LA English DT Proceedings Paper CT Conference on EUV, X-Ray, and Gamma-Ray Instrumentation for Astronomy IV CY JUL 11-12, 1993 CL SAN DIEGO, CA SP SOC PHOTO OPT INSTRUMENTAT ENGINEERS C1 NASA,GEORGE C MARSHALL SPACE FLIGHT CTR,SPACE SCI LAB,HUNTSVILLE,AL 35812. NR 0 TC 0 Z9 0 U1 0 U2 0 PU SPIE - INT SOC OPTICAL ENGINEERING PI BELLINGHAM PA PO BOX 10, BELLINGHAM, WA 98227-0010 BN 0-8194-1255-4 J9 P SOC PHOTO-OPT INS PY 1993 VL 2006 BP 97 EP 101 DI 10.1117/12.162822 PG 5 WC Astronomy & Astrophysics; Instruments & Instrumentation; Optics SC Astronomy & Astrophysics; Instruments & Instrumentation; Optics GA BZ57B UT WOS:A1993BZ57B00011 ER PT B AU FULTON, MA RAMSEY, BD KOLODZIEJCZAK, JJ AF FULTON, MA RAMSEY, BD KOLODZIEJCZAK, JJ BE Siegmund, OHW TI MICROSTRIP DETECTOR DEVELOPMENT FOR X-RAY ASTRONOMY SO EUV, X-RAY, AND GAMMA-RAY INSTRUMENTATION FOR ASTRONOMY IV SE PROCEEDINGS OF THE SOCIETY OF PHOTO-OPTICAL INSTRUMENTATION ENGINEERS (SPIE) LA English DT Proceedings Paper CT Conference on EUV, X-Ray, and Gamma-Ray Instrumentation for Astronomy IV CY JUL 11-12, 1993 CL SAN DIEGO, CA SP SOC PHOTO OPT INSTRUMENTAT ENGINEERS C1 NASA,GEORGE C MARSHALL SPACE FLIGHT CTR,SPACE SCI LAB,HUNTSVILLE,AL 35812. NR 0 TC 1 Z9 1 U1 0 U2 0 PU SPIE - INT SOC OPTICAL ENGINEERING PI BELLINGHAM PA PO BOX 10, BELLINGHAM, WA 98227-0010 BN 0-8194-1255-4 J9 P SOC PHOTO-OPT INS PY 1993 VL 2006 BP 102 EP 107 DI 10.1117/12.162823 PG 6 WC Astronomy & Astrophysics; Instruments & Instrumentation; Optics SC Astronomy & Astrophysics; Instruments & Instrumentation; Optics GA BZ57B UT WOS:A1993BZ57B00012 ER PT B AU CAMPBELL, JW AF CAMPBELL, JW BE Siegmund, OHW TI BASIC AND ADVANCED FOURIER TELESCOPE PERFORMANCE FOR IMAGING THE SKY IN HARD X-RAYS SO EUV, X-RAY, AND GAMMA-RAY INSTRUMENTATION FOR ASTRONOMY IV SE PROCEEDINGS OF THE SOCIETY OF PHOTO-OPTICAL INSTRUMENTATION ENGINEERS (SPIE) LA English DT Proceedings Paper CT Conference on EUV, X-Ray, and Gamma-Ray Instrumentation for Astronomy IV CY JUL 11-12, 1993 CL SAN DIEGO, CA SP SOC PHOTO OPT INSTRUMENTAT ENGINEERS C1 NASA,GEORGE C MARSHALL SPACE FLIGHT CTR,HUNTSVILLE,AL 35812. NR 0 TC 0 Z9 0 U1 0 U2 0 PU SPIE - INT SOC OPTICAL ENGINEERING PI BELLINGHAM PA PO BOX 10, BELLINGHAM, WA 98227-0010 BN 0-8194-1255-4 J9 P SOC PHOTO-OPT INS PY 1993 VL 2006 BP 233 EP 250 DI 10.1117/12.162835 PG 18 WC Astronomy & Astrophysics; Instruments & Instrumentation; Optics SC Astronomy & Astrophysics; Instruments & Instrumentation; Optics GA BZ57B UT WOS:A1993BZ57B00025 ER PT B AU ZHANG, W GILES, AB JAHODA, K SOONG, Y SWANK, JH MORGAN, EH AF ZHANG, W GILES, AB JAHODA, K SOONG, Y SWANK, JH MORGAN, EH BE Siegmund, OHW TI LABORATORY PERFORMANCE OF THE PROPORTIONAL COUNTER ARRAY EXPERIMENT FOR THE X-RAY TIMING EXPLORER SO EUV, X-RAY, AND GAMMA-RAY INSTRUMENTATION FOR ASTRONOMY IV SE PROCEEDINGS OF THE SOCIETY OF PHOTO-OPTICAL INSTRUMENTATION ENGINEERS (SPIE) LA English DT Proceedings Paper CT Conference on EUV, X-Ray, and Gamma-Ray Instrumentation for Astronomy IV CY JUL 11-12, 1993 CL SAN DIEGO, CA SP SOC PHOTO OPT INSTRUMENTAT ENGINEERS C1 NASA,GODDARD SPACE FLIGHT CTR,HIGH ENERGY ASTROPHYS LAB,GREENBELT,MD 20771. RI Jahoda, Keith/D-5616-2012 NR 0 TC 65 Z9 65 U1 0 U2 0 PU SPIE - INT SOC OPTICAL ENGINEERING PI BELLINGHAM PA PO BOX 10, BELLINGHAM, WA 98227-0010 BN 0-8194-1255-4 J9 P SOC PHOTO-OPT INS PY 1993 VL 2006 BP 324 EP 333 DI 10.1117/12.162845 PG 10 WC Astronomy & Astrophysics; Instruments & Instrumentation; Optics SC Astronomy & Astrophysics; Instruments & Instrumentation; Optics GA BZ57B UT WOS:A1993BZ57B00034 ER PT B AU MENENTI, M CHOUDHURY, BJ AF MENENTI, M CHOUDHURY, BJ BE Bolle, HJ Feddes, RA Kalma, JD TI PARAMETERIZATION OF LAND-SURFACE EVAPORATION BY MEANS OF LOCATION DEPENDENT POTENTIAL EVAPORATION AND SURFACE-TEMPERATURE RANGE SO EXCHANGE PROCESSES AT THE LAND SURFACE FOR A RANGE OF SPACE AND TIME SCALES SE IAHS PUBLICATIONS LA English DT Proceedings Paper CT International Symposium on Exchange Processes at the Land Surface for a Range of Space and Time Scales CY JUL 13-16, 1993 CL YOKOHAMA, JAPAN SP INT ASSOC HYDROL SCI, INT ASSOC METEOROL & ATMOSPHER PHYS, UNESCO C1 NASA,GODDARD SPACE FLIGHT CTR,HYDROSPHER PROC LAB,GREENBELT,MD 20771. OI Menenti, Massimo/0000-0001-9176-4556 NR 0 TC 31 Z9 43 U1 1 U2 6 PU INT ASSOC HYDROLOGICAL SCIENCES PI WALLINGFORD PA INST OF HYDROLOGY, WALLINGFORD, ENGLAND OX10 8BB BN 0-947571-53-1 J9 IAHS-AISH P PY 1993 IS 212 BP 561 EP 568 PG 8 WC Geosciences, Multidisciplinary; Meteorology & Atmospheric Sciences; Water Resources SC Geology; Meteorology & Atmospheric Sciences; Water Resources GA BB28F UT WOS:A1993BB28F00067 ER PT B AU STRAZISAR, AJ AF STRAZISAR, AJ BE Kelleher, MD Sreenivasan, KR Shah, RK Joshi, Y TI THE CHANGING ROLES OF EXPERIMENTAL AND COMPUTATIONAL FLUID MECHANICS SO EXPERIMENTAL HEAT TRANSFER, FLUID MECHANICS AND THERMODYNAMICS, 1993, VOLS 1 AND 2 SE ELSEVIER SERIES IN THERMAL AND FLUID SCIENCES LA English DT Proceedings Paper CT 3rd World Conference on Experimental Heat Transfer, Fluid Mechanics and Thermodynamics CY OCT 31-NOV 05, 1993 CL HONOLULU, HI SP AMER SOC MECH ENGINEERS, AMER INST CHEM ENGINEERS, NATL COMM HEAT & MASS TRANSFER, RUSSIA, SOC CHEM ENGINEERS, JAPAN, REG CTR ENERGY HEAT & MASS TRANSFER ASIA & PACIFIC RP STRAZISAR, AJ (reprint author), NASA,LEWIS RES CTR,CLEVELAND,OH 44135, USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU ELSEVIER SCIENCE PUBL B V PI AMSTERDAM PA SARA BURGERHARTSTRAAT 25, PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS BN 0-444-81619-4 J9 ELS SER THERM FLUID PY 1993 BP 3 EP 17 PG 15 WC Thermodynamics; Engineering, Mechanical SC Thermodynamics; Engineering GA BC12S UT WOS:A1993BC12S00001 ER PT B AU CLARK, RK CUNNINGTON, GR WIEDEMANN, KE AF CLARK, RK CUNNINGTON, GR WIEDEMANN, KE BE Kelleher, MD Sreenivasan, KR Shah, RK Joshi, Y TI EXPERIMENTAL EVALUATION OF LOW-CATALYSIS COATINGS FOR HYPERSONIC VEHICLE APPLICATIONS SO EXPERIMENTAL HEAT TRANSFER, FLUID MECHANICS AND THERMODYNAMICS, 1993, VOLS 1 AND 2 SE ELSEVIER SERIES IN THERMAL AND FLUID SCIENCES LA English DT Proceedings Paper CT 3rd World Conference on Experimental Heat Transfer, Fluid Mechanics and Thermodynamics CY OCT 31-NOV 05, 1993 CL HONOLULU, HI SP AMER SOC MECH ENGINEERS, AMER INST CHEM ENGINEERS, NATL COMM HEAT & MASS TRANSFER, RUSSIA, SOC CHEM ENGINEERS, JAPAN, REG CTR ENERGY HEAT & MASS TRANSFER ASIA & PACIFIC C1 NASA,LANGLEY RES CTR,HAMPTON,VA 23665. NR 0 TC 0 Z9 0 U1 0 U2 0 PU ELSEVIER SCIENCE PUBL B V PI AMSTERDAM PA SARA BURGERHARTSTRAAT 25, PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS BN 0-444-81619-4 J9 ELS SER THERM FLUID PY 1993 BP 1171 EP 1179 PG 9 WC Thermodynamics; Engineering, Mechanical SC Thermodynamics; Engineering GA BC12S UT WOS:A1993BC12S00139 ER PT J AU WERNET, MP PLINE, A AF WERNET, MP PLINE, A TI PARTICLE DISPLACEMENT TRACKING TECHNIQUE AND CRAMER-RAO LOWER-BOUND ERROR IN CENTROID ESTIMATES FROM CCD IMAGERY SO EXPERIMENTS IN FLUIDS LA English DT Article ID VELOCIMETRY; RESOLUTION; FLOW AB An efficient video based, multi-frame particle displacement tracking technique is presented. The technique is demonstrated on a thermocapillary flow. The Cramer-Rao lower bound centroid measurement uncertainty is derived for Gaussian particle images with Poisson noise recorded on a CCD array. The optimal particle image diameter is determined to be approximately 1 1/2 pixels. The centroid error increases for particle image diameters larger or smaller than the optimal value. The particle centroid results are carried over to the case of a cross-correlation peak centroid estimate. Particle tracking techniques are shown to have higher accuracy than auto or cross-correlation techniques when the individual velocity measurements are averaged over a comparable correlation subregion. RP WERNET, MP (reprint author), NASA,LEWIS RES CTR,CLEVELAND,OH 44135, USA. NR 27 TC 39 Z9 39 U1 0 U2 2 PU SPRINGER VERLAG PI NEW YORK PA 175 FIFTH AVE, NEW YORK, NY 10010 SN 0723-4864 J9 EXP FLUIDS JI Exp. Fluids PY 1993 VL 15 IS 4-5 BP 295 EP 307 PG 13 WC Engineering, Mechanical; Mechanics SC Engineering; Mechanics GA MB554 UT WOS:A1993MB55400008 ER PT J AU MCLACHLAN, BG KAVANDI, JL CALLIS, JB GOUTERMAN, M GREEN, E KHALIL, G BURNS, D AF MCLACHLAN, BG KAVANDI, JL CALLIS, JB GOUTERMAN, M GREEN, E KHALIL, G BURNS, D TI SURFACE PRESSURE FIELD-MAPPING USING LUMINESCENT COATINGS SO EXPERIMENTS IN FLUIDS LA English DT Article AB In recent experiments we demonstrated the feasibility of using the oxygen dependence of luminescent molecules for surface pressure measurement in aerodynamic testing. This technique is based on the observation that for many luminescent molecules the light emitted increases as the oxygen partial pressure, and thus the air pressure, the molecules see decreases. In practice the surface to be observed is coated with an oxygen permeable polymer containing a luminescent molecule and illuminated with ultraviolet radiation. The airflow induced surface pressure field is seen as a luminescence intensity distribution which can be measured using quantitative video techniques. Computer processing converts the video data into a map of the surface pressure field. The experiments consisted of evaluating a trial luminescent coating in measuring the static surface pressure field over a two-dimensional NACA-0012 section model airfoil for Mach numbers ranging from 0.3 and 0.66. Comparison of the luminescent coating derived pressures were made to those obtained from conventional pressure taps. The method along with the experiment and its results will be described. C1 UNIV WASHINGTON,DEPT CHEM,SEATTLE,WA 98195. UNIV WASHINGTON,CTR BIOENGN,SEATTLE,WA 98195. RP MCLACHLAN, BG (reprint author), NASA,AMES RES CTR,FLUID MECH LAB,MS 260-1,MOFFETT FIELD,CA 94035, USA. NR 6 TC 44 Z9 45 U1 0 U2 2 PU SPRINGER VERLAG PI NEW YORK PA 175 FIFTH AVE, NEW YORK, NY 10010 SN 0723-4864 J9 EXP FLUIDS JI Exp. Fluids PY 1993 VL 14 IS 1-2 BP 33 EP 41 PG 9 WC Engineering, Mechanical; Mechanics SC Engineering; Mechanics GA KC766 UT WOS:A1993KC76600005 ER EF