FN Thomson Reuters Web of Science™ VR 1.0 PT J AU WATKINS, MM EANES, RJ MA, C AF WATKINS, MM EANES, RJ MA, C TI COMPARISON OF TERRESTRIAL REFERENCE FRAME VELOCITIES DETERMINED FROM SLR AND VLBI SO GEOPHYSICAL RESEARCH LETTERS LA English DT Article AB The most recent site velocity solutions from the VLBI analysis group at the Goddard Space Flight Center and the SLR analysis group at the University of Texas Center for Space Research are compared. The results indicate that the horizontal velocities agree, after removing a velocity transformation of a few millimeters per year, to the 2-3 millimeter per year level in an rms sense. The velocities of the best observed sites agree to nearly 1 mm/yr in each horizontal component. In addition, when only sites with adjusted velocities are compared, the agreement of epoch site positions is improved over previous studies to the subcentimeter level in the horizontal components. The sites in the western United States agree at the few millimeter level. C1 NASA,GODDARD SPACE FLIGHT CTR,GREENBELT,MD 20771. RP WATKINS, MM (reprint author), UNIV TEXAS,CTR SPACE RES 60605,AUSTIN,TX 78712, USA. RI Ma, Chopo/D-4751-2012 NR 10 TC 11 Z9 11 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 1 PY 1994 VL 21 IS 3 BP 169 EP 172 DI 10.1029/93GL03542 PG 4 WC Geosciences, Multidisciplinary SC Geology GA MX709 UT WOS:A1994MX70900003 ER PT J AU BILLS, BG AF BILLS, BG TI OBLIQUITY-OBLATENESS FEEDBACK - ARE CLIMATICALLY SENSITIVE VALUES OF OBLIQUITY DYNAMICALLY UNSTABLE SO GEOPHYSICAL RESEARCH LETTERS LA English DT Article ID EARTH ROTATION; LOWER MANTLE; CLIMATE; MODEL; PLEISTOCENE; TRANSITION; CYCLES; MARS; FLUCTUATIONS; PRECESSION AB A new model is presented for feedback between rotational and climatic variations, operative on time scales of 10(4)-10(7) years. Due to the combined effect of planetary perturbations to the Earth's orbit plane and lum-solar torques on the oblate figure of the Earth, the obliquity varies by approximately 1-degrees, on a 4.10(4) year time scale. Associated changes in the seasonal and latitudinal pattern of incident solar radiation cause major glaciations. Mass transport from die oceans to the polar ice sheets during these glaciations can change the gravitational oblateness of the Earth by amounts approaching 1%. As the rate of spin axis precession is directly proportional to the oblateness, the climatically forced mass transport can by dynamically significant. A simple parameterization of this coupled orbital-rotational-climatic system suggests that there is a strong tendency for die system to evolve away from climatically sensitive values of the obliquity. This may explain the mid-Pleistocene transition from an obliquity dominated regime to the present regime in which most climatic variability is concentrated at longer (10(5) year) periods. RP BILLS, BG (reprint author), NASA,GODDARD SPACE FLIGHT CTR,GEODYNAM BRANCH,GREENBELT,MD 20771, USA. RI Bills, Bruce/C-1156-2008 NR 57 TC 27 Z9 27 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 FEB 1 PY 1994 VL 21 IS 3 BP 177 EP 180 DI 10.1029/93GL02024 PG 4 WC Geosciences, Multidisciplinary SC Geology GA MX709 UT WOS:A1994MX70900005 ER PT J AU HALPERN, D WENTZ, F AF HALPERN, D WENTZ, F TI ON THE PROBLEM OF MEASURING INTERANNUAL WIND-SPEED VARIATIONS USING SSMI DATA SO GEOPHYSICAL RESEARCH LETTERS LA English DT Article AB The first Special Sensor Microwave Imager (SSMI) was launched on the Defence Meteorological Satellite Program (DMSP) F8 spacecraft in July 1987, and wind speed was no longer retrieved after December 1991. A second SSMI was launched on DMSP F10 in December 1990. Interpretation of the 1987-1993 (or longer) SSMI wind speed time series is dependent upon the space and time characteristics of the differences between F8 and F10 SSMI measurements. The 10-degrees-zonal averaged monthly mean F8-F10 wind speed difference was negative (positive) for wind speeds less (greater) than 7.9 m s-1, reaching -0.43 (0.32) m s-1 at 5 (10) m s-1. Between 60-degrees-S and 60-degrees-N the 10-degrees-zonal averaged monthly mean F8-F10 wind speed bias was greater than +/- 0.5 m s-1 on several occasions. From 60-degrees-S-60-degrees-N the 1991 average value of the monthly mean root-mean-square difference between daily F8 and F10 wind speeds in 10-degrees-longitudinal bands was 2.0 m s-1. In the 60-degrees-S-60-degrees-N region, about 50% of the daily F8 and F10 wind speed differences was caused by measurement non-simultaneity and about 50% of the difference was attributed to other factors, such as instrument noise and the different azimuthal orientations of each SSMI. Caution is advised in the interpretation of large-scale monthly mean analyses obtained from a combined F8 and F10 wind speed time series. C1 REMOTE SENSING SYST,SANTA ROSA,CA 95405. RP HALPERN, D (reprint author), JET PROP LAB,DIV EARTH & SPACE SCI,PASADENA,CA 91109, USA. NR 7 TC 8 Z9 8 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 1 PY 1994 VL 21 IS 3 BP 193 EP 196 DI 10.1029/94GL00029 PG 4 WC Geosciences, Multidisciplinary SC Geology GA MX709 UT WOS:A1994MX70900009 ER PT J AU PLANET, WG LIENESCH, JH MILLER, AJ NAGATANI, R MCPETERS, RD HILSENRATH, E CEBULA, RP DELAND, MT WELLEMEYER, CG HORVATH, K AF PLANET, WG LIENESCH, JH MILLER, AJ NAGATANI, R MCPETERS, RD HILSENRATH, E CEBULA, RP DELAND, MT WELLEMEYER, CG HORVATH, K TI NORTHERN-HEMISPHERE TOTAL OZONE VALUES FROM 1989-1993 DETERMINED WITH THE NOAA-11 SOLAR BACKSCATTER ULTRAVIOLET (SBUV/2) INSTRUMENT SO GEOPHYSICAL RESEARCH LETTERS LA English DT Article AB Determinations of global total ozone amounts have been made from recently reprocessed measurements with the SBUV/2 on the NOAA-11 environmental satellite since January 1989. This data set employs a new algorithm and an updated calibration. Comparisons with total ozone amounts derived from a significant subset of the global network of Dobson spectrophotometers shows a 0.3% bias between the satellite and ground measurements for the period January 1989-May 1993. Comparisons with the data from individual stations exhibit differing degrees of agreement which could be due to the matchup procedures and also to the uncertainties in the Dobson data. The SBUV/2 data set discussed here traces the Northern Hemisphere total ozone from 1989 to the present, showing a marked decrease from the average of those years starting in the summer of 1992 and continuing into 1993, with an apparent returning to more normal levels in late 1993. C1 HUGHES STX CORP,GREENBELT,MD 20771. SMSRC,BOWIE,MD 20715. NASA,GODDARD SPACE FLIGHT CTR,GREENBELT,MD 20771. NOAA,SATELLITE RES LAB,WASHINGTON,DC 20230. NOAA,CTR CLIMATE ANAL,WASHINGTON,DC 20230. RI McPeters, Richard/G-4955-2013 OI McPeters, Richard/0000-0002-8926-8462 NR 16 TC 36 Z9 36 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 1 PY 1994 VL 21 IS 3 BP 205 EP 208 DI 10.1029/93GL03420 PG 4 WC Geosciences, Multidisciplinary SC Geology GA MX709 UT WOS:A1994MX70900012 ER PT J AU RODRIGUEZ, JM KO, MKW SZE, ND HEISEY, CW YUE, GK MCCORMICK, MP AF RODRIGUEZ, JM KO, MKW SZE, ND HEISEY, CW YUE, GK MCCORMICK, MP TI OZONE RESPONSE TO ENHANCED HETEROGENEOUS PROCESSING AFTER THE ERUPTION OF MT-PINATUBO SO GEOPHYSICAL RESEARCH LETTERS LA English DT Article ID AEROSOLS AB Increases in aerosol loading after the Pinatubo eruption are expected to cause additional ozone depletion. Even though aerosol loadings were highest in the winter of 1991-1992, recent analyses of satellite and ground-based ozone measurements indicate that ozone levels in the winter of 1992-1993 are the lowest recorded in recent years, raising the question of the mechanisms responsible for such behavior. We have incorporated aerosol surface areas derived from the Stratospheric Aerosol and Gas Experiment II (SAGE-II) measurements into our two-dimensional model. Inclusion of heterogeneous chemistry on these enhanced aerosol surfaces yields maximum ozone reductions during the winter of 1992-1993 in the Northern Hemisphere, consistent with those derived from observations. This delayed behavior is due to the combination of the non-linear nature of the impact of heterogeneous reactions as a function of aerosol surface area, and the long time constants for ozone in the lower stratosphere. If heterogeneous mechanisms are primarily responsible for the low 1992-1993 ozone levels, we expect ozone concentrations to start recovering in 1994. C1 NASA,LANGLEY RES CTR,HAMPTON,VA 23681. RP RODRIGUEZ, JM (reprint author), ATMOSPHER ENVIRONM RES INC,840 MEM DR,CAMBRIDGE,MA 02139, USA. RI Rodriguez, Jose/G-3751-2013; Ko, Malcolm/D-5898-2015 OI Rodriguez, Jose/0000-0002-1902-4649; NR 23 TC 55 Z9 55 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 FEB 1 PY 1994 VL 21 IS 3 BP 209 EP 212 DI 10.1029/93GL03537 PG 4 WC Geosciences, Multidisciplinary SC Geology GA MX709 UT WOS:A1994MX70900013 ER PT J AU PIERCE, RB GROSE, WL RUSSELL, JM TUCK, AF AF PIERCE, RB GROSE, WL RUSSELL, JM TUCK, AF TI EVOLUTION OF SOUTHERN-HEMISPHERE SPRING AIR MASSES OBSERVED BY HALOE SO GEOPHYSICAL RESEARCH LETTERS LA English DT Article AB The evolution of Southern Hemisphere air masses observed by the Halogen Occultation Experiment (HALOE) during September 21 through October 15, 1992, is investigated using isentropic trajectories computed from United Kingdom Meteorological Office (UKMO) assimilated winds and temperatures. Maps of constituent concentrations are obtained by accumulation of air masses from previous HALOE occultations. Lagged correlations between initial and subsequent HALOE observations of the same air mass are used to validate the air mass trajectories. High correlations are found for lag times as large as 10 days. Frequency distributions of the air mass constituent concentrations are used to examine constituent distributions in and around the Southern Hemisphere polar vortex. C1 NOAA,AERON LAB,BOULDER,CO 80303. RP PIERCE, RB (reprint author), NASA,LANGLEY RES CTR,MAILSTOP 401B,HAMPTON,VA 23681, USA. RI Pierce, Robert Bradley/F-5609-2010; Tuck, Adrian/F-6024-2011 OI Pierce, Robert Bradley/0000-0002-2767-1643; Tuck, Adrian/0000-0002-2074-0538 NR 7 TC 31 Z9 31 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 1 PY 1994 VL 21 IS 3 BP 213 EP 216 DI 10.1029/93GL02997 PG 4 WC Geosciences, Multidisciplinary SC Geology GA MX709 UT WOS:A1994MX70900014 ER PT J AU LIU, C PEREZ, JD MOORE, TE CHAPPELL, CR AF LIU, C PEREZ, JD MOORE, TE CHAPPELL, CR TI LOW-ENERGY PARTICLE SIGNATURE OF SUBSTORM DIPOLARIZATION SO GEOPHYSICAL RESEARCH LETTERS LA English DT Article ID MAGNETOSPHERIC ELECTRIC-FIELDS AB The low energy particle signature of substorm dipolarization is exhibited through a case study of RIMS data on DE-1 at approximately 2100 MLT, ILAT = 59-degrees approximately 65-degrees, L = 3.8 approximately 5.4 R(E), and geocentric distances 2.6 approximately 2.9 R(E). A strong cross-field-line, poleward outflow that lasts for a few minutes with a velocity that reaches at least 50 km/s is correlated with substorm activity evidenced in the AE index and the MAG-1 data. All the major species (H+, He+, O+) are observed to have the same bulk velocity. The parallel velocities are strongly correlated with the perpendicular velocities. The parallel acceleration is shown to result from the centrifugal force of the ExB drift induced by the dipolarizing perturbation of the magnetic field.. C1 NASA,GEORGE C MARSHALL SPACE FLIGHT CTR,HUNTSVILLE,AL 35812. RP LIU, C (reprint author), AUBURN UNIV,DEPT PHYS,AUBURN,AL 36849, USA. RI Moore, Thomas/D-4675-2012 OI Moore, Thomas/0000-0002-3150-1137 NR 8 TC 12 Z9 12 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 1 PY 1994 VL 21 IS 3 BP 229 EP 232 DI 10.1029/93GL02839 PG 4 WC Geosciences, Multidisciplinary SC Geology GA MX709 UT WOS:A1994MX70900018 ER PT J AU GOSLING, JT BAME, SJ MCCOMAS, DJ PHILLIPS, JL SCIME, EE PIZZO, VJ GOLDSTEIN, BE BALOGH, A AF GOSLING, JT BAME, SJ MCCOMAS, DJ PHILLIPS, JL SCIME, EE PIZZO, VJ GOLDSTEIN, BE BALOGH, A TI A FORWARD-REVERSE SHOCK PAIR IN THE SOLAR-WIND DRIVEN BY OVER-EXPANSION OF A CORONAL MASS EJECTION - ULYSSES OBSERVATIONS SO GEOPHYSICAL RESEARCH LETTERS LA English DT Article ID PIONEER-10; LOOP; 1-AU AB A previously unidentified type of solar wind forward-reverse shock pair has been observed by Ulysses at 4.64 AU and S32.5-degrees. In contrast to most solar wind forward-reverse shock pairs, which are driven by the speed difference between fast solar wind plasma and slower plasma ahead, this particular shock pair was driven purely by the over-expansion of a coronal mass ejection, CME, in transit from the Sun. A simple numerical simulation indicates that the overexpansion was a result of a high initial internal plasma and magnetic field pressure within the CME. The CME observed at 4.64 AU had the internal field structure of a magnetic flux rope. This event was associated with a solar disturbance in which new magnetic loops formed in the corona almost directly beneath Ulysses approximately 11 days earlier. This association suggests that the flux rope was created as a result of reconnection between the ''legs'' of neighboring magnetic loops within the rising CME. C1 NOAA,SEL,BOULDER,CO 80303. SAN JUAN INST,SAN JUAN CAPISTRANO,CA. JET PROP LAB,PASADENA,CA 91109. UNIV LONDON IMPERIAL COLL SCI TECHNOL & MED,BLACKETT LAB,LONDON SW7 2BZ,ENGLAND. RP GOSLING, JT (reprint author), LOS ALAMOS NATL LAB,MS D466,LOS ALAMOS,NM 87545, USA. NR 20 TC 72 Z9 72 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 FEB 1 PY 1994 VL 21 IS 3 BP 237 EP 240 DI 10.1029/94GL00001 PG 4 WC Geosciences, Multidisciplinary SC Geology GA MX709 UT WOS:A1994MX70900020 ER PT J AU SIMONELLI, DP BOUCHER, J HELFENSTEIN, P VEVERKA, J OSHAUGHNESSY, M AF SIMONELLI, DP BOUCHER, J HELFENSTEIN, P VEVERKA, J OSHAUGHNESSY, M TI SEARCH FOR TEMPERATURE-RELATED ALBEDO CHANGES IN NIGHTSIDE AND POSTECLIPSE IMAGES OF IO SO ICARUS LA English DT Article ID JUPITERS SATELLITE IO; GALILEAN SATELLITES; REFLECTANCE SPECTRA; GLOBAL DISTRIBUTION; SURFACE COMPOSITION; SULFUR ALLOTROPES; SOLID SULFUR; LO; PHOTOMETRY; IRRADIATION AB Using an image-summing process that increases the visibility of Jupiterlit surface features in Voyager images, we have produced the best-ever violet-filter image of the nightside of Io and the best-ever nightside/dayside brightness ratio map of this jovian moon. The ratio map shows no convincing evidence, on either global or local scales, of diurnal temperature-dependent albedo variations. We have also taken an image-ratioing technique developed by O'Shaughnessy et al. (1989, Lunar Planet. Sci. 20, 812-813), which those authors applied to Voyager violet-filter observations of one Io eclipse reappearance, and extended it to two other, higher-resolution Voyager posteclipse imaging sequences. In none of the three imaging sequences do we find any isolated surface regions that convincingly exhibit posteclipse temperature-related albedo variations. These negative results suggest that on Io, pure cyclo-octasulfur (S8), and transient nighttime or in-eclipse deposits of SO2 frost, are at best limited to isolated areas smaller than the resolution of the images in use (i.e., smaller than a few tens of kilometers in size). Such limits are consistent with (1) the negative results reported by the majority of telescopic observers who have searched for posteclipse brightening of Io, (2) indications that physical processes in the ionian surface environment will change any S8 into other allotropes of sulfur, and (3) suggestions that Io's atmosphere is too thin to allow the deposition of transient, optically thick SO2 frost layers at nighttime or during eclipse. (C) 1994 Academic Press, Inc. C1 JET PROP LAB,PASADENA,CA 91109. RP SIMONELLI, DP (reprint author), CORNELL UNIV,CTR RADIOPHYS & SPACE RES,SPACE SCI BLDG,ITHACA,NY 14853, USA. NR 43 TC 8 Z9 8 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 1994 VL 107 IS 2 BP 375 EP 387 DI 10.1006/icar.1994.1030 PG 13 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA NJ192 UT WOS:A1994NJ19200011 ER PT J AU DOGGETT, LE SCHAEFFER, BE AF DOGGETT, LE SCHAEFFER, BE TI LUNAR CRESCENT VISIBILITY SO ICARUS LA English DT Article ID LENGTH AB We report the results of five Moonwatches, in which more than 2000 observers throughout North America attempted to sight the thin lunar crescent. For each Moonwatch we were able to determine the position of the Lunar Date Line (LDL), the line along which a normal observer has a 50% probability of spotting the Moon. The observational LDLs were then compared with predicted LDLs derived from crescent visibility prediction algorithms. We find that ancient and medieval rules are highly unreliable. More recent empirical criteria, based on the relative altitude and azimuth of the Moon at the time of sunset, have a reasonable accuracy, with the best specific formulation being due to Yallop. The modem theoretical model by Schaefer (based on the physiology of the human eye and the lor-al observing conditions) is found to have the least systematic error, the least average error, and the least maximum error of all models tested. Analysis of the observations also provided information about atmospheric, optical and human factors that affect the observations. We show that observational lunar calendars have a natural bias to begin early. (C) 1994 Academic Press, Inc. C1 NASA,GODDARD SPACE FLIGHT CTR,GREENBELT,MD 20771. RP DOGGETT, LE (reprint author), USN OBSERV,NAUT ALMANAC OFF,WASHINGTON,DC 20392, USA. NR 52 TC 22 Z9 22 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 1994 VL 107 IS 2 BP 388 EP 403 DI 10.1006/icar.1994.1031 PG 16 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA NJ192 UT WOS:A1994NJ19200012 ER PT J AU SALAMA, F ALLAMANDOLA, LJ SANDFORD, SA BREGMAN, JD WITTEBORN, FC CRUIKSHANK, DP AF SALAMA, F ALLAMANDOLA, LJ SANDFORD, SA BREGMAN, JD WITTEBORN, FC CRUIKSHANK, DP TI IS H2O PRESENT ON IO - THE DETECTION OF A NEW STRONG BAND NEAR 3590 CM-1 (2.79 MU-M) SO ICARUS LA English DT Note ID NEAR-INFRARED SPECTRUM; ABSORPTION FEATURE; SULFUR-DIOXIDE; SURFACE; SO2; IDENTIFICATION; DISCOVERY; FROST AB A strong absorption band at 3590 +/- 20 cm-1 (2.790 +/- 0.015 mum) has been discovered in the spectrum of Io using the Kuiper Airborne Observatory (KAO). The 2nu1 + nu3 combination mode of solid SO2 falls at this position. Since SO2 is abundant on Io it must contribute to the new band. However, a band due to H2O was predicted near this frequency in Io's spectrum based on laboratory experiments of H2O:SO2 mixed Io ice analogs which were used to assign the two weak, variable features at 3370 and 3170 cm-1 (2.97 and 3.15 mum) to trace amounts of H2O frozen in solid SO2 on Io. The new band probably originates from both SO2 and H2O. Unfortunately, the spectral resolution of the data is insufficient to settle the issue of whether there are two resolvable components. (C) 1994 Academic Press, Inc. RP SALAMA, F (reprint author), NASA,AMES RES CTR,DIV SPACE SCI,MAIL STOP 245-6,MOFFETT FIELD,CA 94035, USA. OI Salama, Farid/0000-0002-6064-4401 NR 36 TC 17 Z9 17 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 1994 VL 107 IS 2 BP 413 EP 417 DI 10.1006/icar.1994.1033 PG 5 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA NJ192 UT WOS:A1994NJ19200014 PM 11539181 ER PT J AU KRISHEN, K AF KRISHEN, K TI FUTURE-TRENDS IN ANTENNAS AND PROPAGATION FOR THE UNITED-STATES SPACE PROGRAM SO IEEE ANTENNAS AND PROPAGATION MAGAZINE LA English DT Article ID TECHNOLOGY AB A key role of NASA (the US National Aeronautics and Space Administration) is to plan and execute programs, aimed at understanding the universe and matter, and the processes that underlie the development and evolution of life and the planet Earth. The part played by electromagnetic (EM) systems in information and energy transfer, and the tracking and imaging of objects and scenes, has been crucial to the successes of the space programs of various nations, to date. Indeed, the latest theories of the universe are based on the microwave-radiometer observations of the last two decades. The communications link, with manned and unmanned satellites, provides a crucial pathway for monitoring and controlling the health of these systems, as well as for transferring knowledge that is acquired by in-situ and remote observations. Previous space programs have also served the purpose of identifying the requirements for future electromagnetic systems, and associated techniques. In addition to small size, weight, and power consumption, the crucial requirements are in the radiation and thermal environment, in which the operation of these systems and the propagation of the EM waves should be assured. The Earth-observation applications of EM sensing include climate change, environmental monitoring, agriculture, geology, hydrology, urban planning, forest surveys, and ocean monitoring. Active- and passive-microwave, infrared, visible-band, and laser sensors will be used. Many emission, scattering, and propagation areas of EM research need to be addressed for these applications. Research and technique development will also be needed, in the areas of visualization and simulation, as tools for design and education purposes. New and innovative approaches, to the testing of propagation effects and antenna performance, can be developed through these software tools, in addition to training and education in the field of antennas and propagation. RP KRISHEN, K (reprint author), NASA,LYNDON B JOHNSON SPACE CTR,HOUSTON,TX 77058, USA. NR 6 TC 1 Z9 1 U1 0 U2 2 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 1045-9243 J9 IEEE ANTENNAS PROPAG JI IEEE Antennas Propag. Mag. PD FEB PY 1994 VL 36 IS 1 BP 31 EP 35 DI 10.1109/74.262632 PG 5 WC Engineering, Electrical & Electronic; Telecommunications SC Engineering; Telecommunications GA PT609 UT WOS:A1994PT60900009 ER PT J AU NEUDECK, PG POWELL, JA AF NEUDECK, PG POWELL, JA TI PERFORMANCE LIMITING MICROPIPE DEFECTS IN SILICON-CARBIDE WAFERS SO IEEE ELECTRON DEVICE LETTERS LA English DT Article ID GROWTH; DIODES AB We report on the characteristics of a major defect in mass-produced silicon carbide wafers which severely limits the performance of silicon carbide power devices. Micropipe defects originating in 4H- and 6H-SiC substrates were found to cause prevalanche reverse-bias point failures in most epitaxially-grown pn junction devices of 1 mm2 or larger in area. Until such defects are significantly reduced from their present density (on the order of 100's of micropipes/cm2), silicon carbide power device ratings will be restricted to around several amps or less. RP NEUDECK, PG (reprint author), NASA,LEWIS RES CTR,CLEVELAND,OH 44135, USA. NR 20 TC 216 Z9 222 U1 2 U2 25 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0741-3106 J9 IEEE ELECTR DEVICE L JI IEEE Electron Device Lett. PD FEB PY 1994 VL 15 IS 2 BP 63 EP 65 DI 10.1109/55.285372 PG 3 WC Engineering, Electrical & Electronic SC Engineering GA ND686 UT WOS:A1994ND68600007 ER PT J AU LANSKY, AL PHILPOT, AG AF LANSKY, AL PHILPOT, AG TI AL-BASED PLANNING FOR DATA-ANALYSIS SO IEEE EXPERT-INTELLIGENT SYSTEMS & THEIR APPLICATIONS LA English DT Article RP LANSKY, AL (reprint author), NASA,AMES RES CTR,RECOM,ARTIFICIAL INTELLIGENCE RES BRANCH,MS 2692,MOFFETT FIELD,CA 94035, USA. NR 8 TC 1 Z9 1 U1 0 U2 0 PU IEEE COMPUTER SOC PI LOS ALAMITOS PA 10662 LOS VAQUEROS CIRCLE, PO BOX 3014, LOS ALAMITOS, CA 90720-1264 SN 0885-9000 J9 IEEE EXPERT JI IEEE Expert-Intell. Syst. Appl. PD FEB PY 1994 VL 9 IS 1 BP 21 EP 27 DI 10.1109/64.295136 PG 7 WC Computer Science, Artificial Intelligence; Engineering, Electrical & Electronic SC Computer Science; Engineering GA NJ377 UT WOS:A1994NJ37700004 ER PT J AU ALIAHMAD, WY REBEIZ, GM AF ALIAHMAD, WY REBEIZ, GM TI A 335 GHZ QUASI-OPTICAL SCHOTTKY RECEIVER SO IEEE MICROWAVE AND GUIDED WAVE LETTERS LA English DT Article AB A quasi-optical Schottky receiver based on an integrated planar antenna-mixer structure has been developed and tested at 335 GHz. The receiver antenna is based on the quasi-integrated horn antenna with 23 dB directivity. At room temperature, the measured DSB antenna-mixer conversion loss and noise temperature at 335 GHz are 8.5 dB and 1750K, respectively. This simple and tunerless design has a noise figure within 1 dB of the best tuned room temperature waveguide mixer using a similar planar GaAs Schottky diode [1]. RP ALIAHMAD, WY (reprint author), UNIV MICHIGAN,NASA,CTR SPACE TERAHERTZ TECHNOL,DEPT ELECT ENGN & COMP SCI,ANN ARBOR,MI 48109, USA. NR 0 TC 4 Z9 4 U1 0 U2 0 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 1051-8207 J9 IEEE MICROW GUIDED W JI IEEE Microw. Guided Wave Lett. PD FEB PY 1994 VL 4 IS 2 BP 37 EP 39 DI 10.1109/75.267709 PG 3 WC Engineering, Electrical & Electronic SC Engineering GA NK911 UT WOS:A1994NK91100001 ER PT J AU EGAWA, T GEORGE, T JIMBO, T UMENO, M AF EGAWA, T GEORGE, T JIMBO, T UMENO, M TI CHARACTERIZATION OF SINGLE QUANTUM-WELLS ON GAAS/SI GROWN BY METALORGANIC CHEMICAL-VAPOR-DEPOSITION SO IEEE PHOTONICS TECHNOLOGY LETTERS LA English DT Article ID SI SUBSTRATE; SILICON; LASERS; LAYERS; DIODE AB The use of Al0.5Ga0.5As/Al0.55Ga0.45P intermediate layers and in-situ thermal cycle annealing are shown to be effective in obtaining smooth and sharp heterointerfaces for Al0.3Ga0.7As/GaAs single quantum wells (SQWs) grown on Si substrates, as a result of an initial two-dimensional growth and a reduction in threading dislocation density. The best lasing characteristics are obtained in Al0.3Ga0.7As/GaAs SQW laser diodes fabricated using the above structure in comparison to those fabricated using the more conventional two-step growth technique. C1 NAGOYA INST TECHNOL,DEPT ELECT & COMP ENGN,NAGOYA,AICHI 466,JAPAN. JET PROP LAB,CTR SPACE MICROELECTR TECHNOL,PASADENA,CA 91109. RP EGAWA, T (reprint author), NAGOYA INST TECHNOL,MICROSTRUCT DEVICES RES CTR,GOKISOCHO,SHOWA KU,NAGOYA,AICHI 466,JAPAN. NR 15 TC 2 Z9 2 U1 0 U2 0 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 1041-1135 J9 IEEE PHOTONIC TECH L JI IEEE Photonics Technol. Lett. PD FEB PY 1994 VL 6 IS 2 BP 150 EP 152 DI 10.1109/68.275412 PG 3 WC Engineering, Electrical & Electronic; Optics; Physics, Applied SC Engineering; Optics; Physics GA ND865 UT WOS:A1994ND86500008 ER PT J AU HUANG, J WU, TK LEE, SW AF HUANG, J WU, TK LEE, SW TI TRI-BAND FREQUENCY-SELECTIVE SURFACE WITH CIRCULAR RING ELEMENTS SO IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION LA English DT Article ID ARRAYS; SINGLE AB Theoretical analysis, physical reasonings, and experimental verifications are presented for a frequency selective surface with circular ring elements. Both double-screen and single-screen designs are generated for a tri-band system that reflects the X-band signal while transmitting through the S- and Ku-band signals. In these designs, the dielectric loading effect is used to reduce ring size and element spacing and thus avoid the grating lobe problem. The circular ring element is very insensitive to a large variation of the RF incident angle. C1 UNIV ILLINOIS,URBANA,IL 61801. RP HUANG, J (reprint author), CALTECH,JET PROP LAB,4800 OAK GROVE DR,PASADENA,CA 91109, USA. NR 18 TC 104 Z9 108 U1 3 U2 12 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 1994 VL 42 IS 2 BP 166 EP 175 DI 10.1109/8.277210 PG 10 WC Engineering, Electrical & Electronic; Telecommunications SC Engineering; Telecommunications GA NF480 UT WOS:A1994NF48000005 ER PT J AU DEROO, RD ULABY, FT AF DEROO, RD ULABY, FT TI BISTATIC SPECULAR SCATTERING FROM ROUGH DIELECTRIC SURFACES SO IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION LA English DT Article ID WALNUT ORCHARD; MODEL; BACKSCATTER AB An experimental investigation was conducted to determine the nature of bistatic scattering from rough dielectric surfaces at 10 GHz. This paper focusses specifically on the dependence of coherent and incoherent scattered fields on surface roughness for the specular direction. The measurements, which were conducted for a smooth surface with ks < 0.2 (where k = 2 pi/lambda and s is the rms surface height) and for three rough surfaces with ks = 0.5, 1.39, and 1.94, included observations over the range of incidence angles from 20 degrees to 65 degrees for both horizontal and vertical polarizations. For the coherent component, the reflectivity was found to behave in accordance with the prediction of the Physical Optics model, although it was observed that the Brewster angle exhibited a small negative shift with increasing roughness. The first-order solution of Physical Optics also provided good agreement with observations for hh-polarized incoherent scattering coefficient, but it failed to predict the behavior of the vv-polarized scattering coefficient in the angular range around the Brewster angle. A second-order solution is proposed which appears to partially address the deficiency of the Physical Optics model. C1 UNIV MICHIGAN,NASA,CTR SPACE TERAHERTZ TECHNOL,ANN ARBOR,MI 48109. RP DEROO, RD (reprint author), UNIV MICHIGAN,DEPT ELECT & COMP ENGN,RADIAT LAB,ANN ARBOR,MI 48109, USA. RI De Roo, Roger/J-2208-2012 OI De Roo, Roger/0000-0001-8391-2950 NR 19 TC 39 Z9 39 U1 0 U2 3 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0018-926X J9 IEEE T ANTENN PROPAG JI IEEE Trans. Antennas Propag. PD FEB PY 1994 VL 42 IS 2 BP 220 EP 231 DI 10.1109/8.277216 PG 12 WC Engineering, Electrical & Electronic; Telecommunications SC Engineering; Telecommunications GA NF480 UT WOS:A1994NF48000011 ER PT J AU SIMON, MK AF SIMON, MK TI A SIMPLE EVALUATION OF DPSK ERROR-PROBABILITY PERFORMANCE IN THE PRESENCE OF BIT TIMING ERROR SO IEEE TRANSACTIONS ON COMMUNICATIONS LA English DT Article AB This paper presents a simple closed form expression for the conditional (on the timing error) bit error probability of an otherwise ideal DPSK receiver. Numerical results are given for average bit error probability obtained by averaging the conditional error probability over a Tikhonov pdf which is a typical characterization of the timing error in practical bit synchronizers. RP SIMON, MK (reprint author), JET PROP LAB,PASADENA,CA 91109, USA. NR 6 TC 10 Z9 10 U1 0 U2 0 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0090-6778 J9 IEEE T COMMUN JI IEEE Trans. Commun. PD FEB-APR PY 1994 VL 42 IS 2-4 BP 263 EP 267 DI 10.1109/TCOMM.1994.577028 PN 1 PG 5 WC Engineering, Electrical & Electronic; Telecommunications SC Engineering; Telecommunications GA NK324 UT WOS:A1994NK32400018 ER PT J AU SIMON, MK DIVSALAR, D AF SIMON, MK DIVSALAR, D TI MULTIPLE SYMBOL PARTIALLY COHERENT DETECTION OF MPSK SO IEEE TRANSACTIONS ON COMMUNICATIONS LA English DT Article AB In this paper we show that by using the known (or estimated) value of carrier tracking loop SNR in the decision metric, it is possible to improve the error probability performance of a partially coherent MPSK system relative to that corresponding to the commonly used ideal coherent decision rule. Using a maximum-likehood approach, an optimum decision metric is derived and shown to take the form of a weighted sum of the ideal coherent decision metric (i.e., correlation) and the noncoherent decision metric which is optimum for differential detection of MPSK. The performance of a receiver based on this optimum decision rule is derived and shown to provide continued improvement with increasing length of observation interval (data symbol sequence length). Unfortunately increasing the observation length does not eliminate the error floor associated with the finite loop SNR. Nevertheless, in the limit of infinite observation length, the average error probability performance approaches the algebraic sum of the error floor and the performance of ideal coherent detection, Le., at any error probability above the error floor, there is no degradation due to the partial coherence. While the above is strictly speaking only true in the limit of infinite observation length, it is shown that one can virtually achieve this limiting behavior with practical size observation lengths. Furthermore, the performance is quite insensitive to mismatch between the estimate of loop SNR (e.g., obtained from measurement) fed to the decision metric relative and its true value. RP SIMON, MK (reprint author), JET PROP LAB,PASADENA,CA 91109, USA. NR 5 TC 14 Z9 14 U1 0 U2 0 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0090-6778 J9 IEEE T COMMUN JI IEEE Trans. Commun. PD FEB-APR PY 1994 VL 42 IS 2-4 BP 430 EP 439 DI 10.1109/TCOMM.1994.577070 PN 1 PG 10 WC Engineering, Electrical & Electronic; Telecommunications SC Engineering; Telecommunications GA NK324 UT WOS:A1994NK32400037 ER PT J AU CHENG, U SIMON, MK POLYDOROS, A LEVITT, BK AF CHENG, U SIMON, MK POLYDOROS, A LEVITT, BK TI STATISTICAL-MODELS FOR EVALUATING THE PERFORMANCE OF COHERENT SLOW FREQUENCY-HOPPED M-FSK INTERCEPT RECEIVERS SO IEEE TRANSACTIONS ON COMMUNICATIONS LA English DT Article AB Exact and approximate statistical models (analytical and simulation), based on average-and maximum-lilelihood ratio tests, are studies and compared for the purpose of establishing an accurate assessment of the performance of coherent SFH M-FSK intercept receivers. C1 UNIV SO CALIF,LOS ANGELES,CA 90089. RP CHENG, U (reprint author), JET PROP LAB,PASADENA,CA 91109, USA. NR 7 TC 6 Z9 7 U1 0 U2 0 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0090-6778 J9 IEEE T COMMUN JI IEEE Trans. Commun. PD FEB-APR PY 1994 VL 42 IS 2-4 BP 689 EP 699 DI 10.1109/TCOMM.1994.577097 PN 1 PG 11 WC Engineering, Electrical & Electronic; Telecommunications SC Engineering; Telecommunications GA NK324 UT WOS:A1994NK32400063 ER PT J AU MILEANT, A HINEDI, S AF MILEANT, A HINEDI, S TI OVERVIEW OF ARRAYING TECHNIQUES FOR DEEP SPACE COMMUNICATIONS SO IEEE TRANSACTIONS ON COMMUNICATIONS LA English DT Article AB Four different arraying schemes applicable to deep space communications are discussed and analyzed. These include symbol stream combining (SSC), baseband combining (BC), carrier arraying (CA) and full spectrum combining (FSC). In addition, sideband aiding (SA) is also included and compared. Moreover, combinations of these schemes are introduced and discussed such as carrier arraying with sideband aiding and baseband combining (CA/SA/BC) or carrier arraying with symbol stream combining (CA/SSC), just to name a few. Complexity versus performance is traded off throughout the paper and benefits to the reception of existing spacecraft signals are discussed. C1 JET PROP LAB,COMMUN RES SECT,DIGITAL SIGNAL PROC RES GRP,PASADENA,CA 91109. RP MILEANT, A (reprint author), JET PROP LAB,TELECOMMUN SYST SECT,PASADENA,CA 91109, USA. NR 7 TC 5 Z9 11 U1 0 U2 0 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0090-6778 J9 IEEE T COMMUN JI IEEE Trans. Commun. PD FEB-APR PY 1994 VL 42 IS 2-4 BP 1856 EP 1865 DI 10.1109/TCOMM.1994.582895 PN 3 PG 10 WC Engineering, Electrical & Electronic; Telecommunications SC Engineering; Telecommunications GA NN186 UT WOS:A1994NN18600052 ER PT J AU LEVITT, BK CHENG, UJ POLYDOROS, A SIMON, MK AF LEVITT, BK CHENG, UJ POLYDOROS, A SIMON, MK TI OPTIMUM DETECTION OF SLOW FREQUENCY-HOPPED SIGNALS SO IEEE TRANSACTIONS ON COMMUNICATIONS LA English DT Article AB Optimum detectors have previously been derived for fast frequency-hopped (FFH) signals with M-ary frequency-shift-keyed (MFSK) data modulation received in additive white Gaussian noise (FFH here implies that a single MFSK tone is transmitted per hop). This paper extends that work to the more analytically complex category of slow frequency-hopped (SFH) signals with multiple MFSK tones per hop. A special subset of the SFH/MFSK format that receives particular attention in this paper is the case of continuous-phase modulation (CPM) for which the carrier phase is assumed to be constant over the entire hop. A fundamental conclusion is that SFH/CPM modulation is advantageous not only to the communicator but also to a sophisticated noncoherent detector. By applying techniques developed in this paper to exploit the continuous-phase characteristic, an intercept receiver of reasonable complexity will perform appreciably better than traditional channelized detectors. C1 UNIV SO CALIF, INST COMMUN SCI, LOS ANGELES, CA 90089 USA. RP LEVITT, BK (reprint author), JET PROP LAB, COMMUN RES SECT, PASADENA, CA 91109 USA. NR 13 TC 12 Z9 12 U1 0 U2 0 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI PISCATAWAY PA 445 HOES LANE, PISCATAWAY, NJ 08855-4141 USA SN 0090-6778 J9 IEEE T COMMUN JI IEEE Trans. Commun. PD FEB-APR PY 1994 VL 42 IS 2-4 BP 1990 EP 2000 DI 10.1109/TCOMM.1994.583413 PN 3 PG 11 WC Engineering, Electrical & Electronic; Telecommunications SC Engineering; Telecommunications GA NN186 UT WOS:A1994NN18600066 ER PT J AU SHIHABI, MM NGUYEN, TM HINEDI, SM AF SHIHABI, MM NGUYEN, TM HINEDI, SM TI A COMPARISON OF TELEMETRY SIGNALS IN THE PRESENCE AND ABSENCE OF A SUBCARRIER SO IEEE TRANSACTIONS ON ELECTROMAGNETIC COMPATIBILITY LA English DT Article ID SPACE AB The performance of deep-space telemetry signals that employ a residual carrier modulation technique is compared in the presence and absence of a subcarrier. When the subcarrier is present, the performance for the resulting pulse-coded modulation/phase-shift keyed/phase-modulated (PCM/PSK/PM) scheme is evaluated for both sine-wave and square-wave subcarriers and non-return-to zero (NRZ) data. When the subcarrier is absent, the performance for the resulting PCM/PM technique is evaluated for both the NRZ and the bi-phase data format. The comparison is based on telemetry performance as well as bandwidth efficiency. The first criterion is characterized in terms of the symbol error rate (SER) as a function of symbol SNR, loop bandwidth-to-data rate ratio, and modulation index. The bandwidth efficiency is characterized by the occupancy factor. The results of both the analysis and measurements show that when the interference-to-carrier ratio (ICR) is less than -20 dB, the performance degradation in the absence of a subcarrier is negligible. Various combinations of loop bandwidth-to-data rate ratios and modulation indices that achieve this performance are derived and listed. Bandwidth occupancy comparison indicates that PCM/PM/NRZ is the most efficient in this regard. Therefore, by eliminating the subcarrier and using the PCM/PM/NRZ scheme, many advantages can be realized without any sacrifice in performance. RP SHIHABI, MM (reprint author), JET PROP LAB,PASADENA,CA 91109, USA. NR 10 TC 2 Z9 2 U1 0 U2 0 PU IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2394 SN 0018-9375 J9 IEEE T ELECTROMAGN C JI IEEE Trans. Electromagn. Compat. PD FEB PY 1994 VL 36 IS 1 BP 60 EP 73 DI 10.1109/15.265481 PG 14 WC Engineering, Electrical & Electronic; Telecommunications SC Engineering; Telecommunications GA NB817 UT WOS:A1994NB81700009 ER PT J AU SALEZ, M FEBVRE, P MCGRATH, WR BUMBLE, B LEDUC, HG AF SALEZ, M FEBVRE, P MCGRATH, WR BUMBLE, B LEDUC, HG TI AN SIS WAVE-GUIDE HETERODYNE RECEIVER FOR 600 HGZ-635 GHZ SO INTERNATIONAL JOURNAL OF INFRARED AND MILLIMETER WAVES LA English DT Article DE SUPERCONDUCTORS; SIS JUNCTIONS; SIS MIXERS; SIS RECEIVERS; SUBMILLIMETER WAVES ID QUASIPARTICLE MIXERS; JUNCTION; CURRENTS AB A waveguide SIS heterodyne receiver using a Nb/AlO(x)/Nb junction has been built for astronomical observations of molecular transitions in the frequency range 600 GHz - 635 GHz, and has been successfully used at the Caltech Submillimeter Observatory (CSO). We report double sideband (DSB) receiver noise temperatures as low as 245 K at 600 GHz -610 GHz, and near 300 K over the rest of the bandwidth. These results confirm that SIS quasiparticle mixers work well at submillimeter-wave frequencies corresponding to photon energies of at least 90% of the superconductor energy gap. In addition, we have systematically investigated the effect on the receiver performance of the overlap between first-order and second-order photon steps of opposite sign at these frequencies. The receiver noise increases by as much as 40% in the region of overlap. We infer potential limitations for operating submillimeter-wave Nb/AlO(x)/Nb mixers. C1 OBSERV MEUDON,DEMIRM,F-92195 MEUDON,FRANCE. RP SALEZ, M (reprint author), JET PROP LAB,CTR SPACE MICROELECTR TECHNOL,4800 OAK GROVE DR,PASADENA,CA 91109, USA. NR 28 TC 18 Z9 18 U1 0 U2 2 PU PLENUM PUBL CORP PI NEW YORK PA 233 SPRING ST, NEW YORK, NY 10013 SN 0195-9271 J9 INT J INFRARED MILLI JI Int. J. Infrared Millimeter Waves PD FEB PY 1994 VL 15 IS 2 BP 349 EP 368 DI 10.1007/BF02096246 PG 20 WC Engineering, Electrical & Electronic; Optics; Physics, Applied SC Engineering; Optics; Physics GA MY960 UT WOS:A1994MY96000003 ER PT J AU SAND, JR FISCHER, SK JONES, JA AF SAND, JR FISCHER, SK JONES, JA TI CARNAHAN-STARLING-DESANTIS AND LEE-KESLER-PLOCKER INTERACTION COEFFICIENTS FOR SEVERAL BINARY-MIXTURES OF OZONE-SAFE REFRIGERANTS SO INTERNATIONAL JOURNAL OF REFRIGERATION-REVUE INTERNATIONALE DU FROID LA English DT Article DE CFC ALTERNATIVES; BINARY INTERACTION COEFFICIENTS; EQUATIONS OF STATE; OZONE DEPLETION AB Interaction coefficients (ICs) which characterize the non-ideal behaviour of refrigerant mixtures are an important parameters for predicting or modelling the thermodynamic performance of these mixtures in air-conditioning and refrigeration cycles. Experimental data which permit calculation of these parameters for many combinations of the newer, more environmentally acceptable refrigerants are scarce. Saturated vapour pressure data for 70 known mixtures of 8 different refrigerants in 18 binary combinations were analysed to find the interaction coefficients from the best correlation between vapour pressures calculated from the Carnahan-Starling-DeSantis (CSD) and Lee-Kesler-Plocker (LKP) refrigerant property routines and experimental data. Nine of the experimentally measured ICs were not previously given for the CSD routines in the current version of REFPROP(R) from the National Institute of Standards and Technology. Fifteen new LKP ICs are reported. Comparisons are made with both published values and those estimated using algorithms unique to each system of subroutines. Agreement between the ICs reported in this work and published or estimated values is reasonably good in most cases given the simplicity of the test apparatus and experimental procedures. Very good agreement was seen between the ICs calculated in this work and the literature values for R12/R152a, R134a/R134 and R22/F152a, but poor agreement was seen for R22/R142b. Comparisons of published to estimated ICs and reported to estimated ICs suggest that estimation techniques should be improved. C1 JET PROP LAB,PASADENA,CA 91109. RP SAND, JR (reprint author), OAK RIDGE NATL LAB,POB 2008,BLDG 3147,MAIL STOP 6070,OAK RIDGE,TN 37831, USA. NR 17 TC 8 Z9 11 U1 0 U2 1 PU BUTTERWORTH-HEINEMANN LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, OXON, ENGLAND OX5 1GB SN 0140-7007 J9 INT J REFRIG JI Int. J. Refrig.-Rev. Int. Froid PD FEB PY 1994 VL 17 IS 2 BP 123 EP 129 DI 10.1016/0140-7007(94)90053-1 PG 7 WC Thermodynamics; Engineering, Mechanical SC Thermodynamics; Engineering GA ML571 UT WOS:A1994ML57100006 ER PT J AU SHIMABUKURO, YE HOLBEN, BN TUCKER, CJ AF SHIMABUKURO, YE HOLBEN, BN TUCKER, CJ TI FRACTION IMAGES DERIVED FROM NOAA AVHRR DATA FOR STUDYING THE DEFORESTATION IN THE BRAZILIAN AMAZON SO INTERNATIONAL JOURNAL OF REMOTE SENSING LA English DT Article C1 UNIV SPACE RES ASSOC,NASA,GSFC,CODE 923,GREENBELT,MD 20771. RP SHIMABUKURO, YE (reprint author), INST NACL PESQUISAS ESPACIAIS,S JOSE CAMPOS,BRAZIL. NR 4 TC 24 Z9 26 U1 1 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 FEB PY 1994 VL 15 IS 3 BP 517 EP 520 PG 4 WC Remote Sensing; Imaging Science & Photographic Technology SC Remote Sensing; Imaging Science & Photographic Technology GA NA285 UT WOS:A1994NA28500001 ER PT J AU ECK, TF HOLBEN, BN AF ECK, TF HOLBEN, BN TI AVHRR SPLIT WINDOW TEMPERATURE DIFFERENCES AND TOTAL PRECIPITABLE WATER OVER LAND SURFACES SO INTERNATIONAL JOURNAL OF REMOTE SENSING LA English DT Article ID SAHARA DUST POWDERS; INFRARED REGION; MU-M; VAPOR; EMISSIVITIES; VARIABILITY; RETRIEVALS; QUARTZ AB Measurements from the thermal infrared split window channels of the AVHRR sensor were investigated for their relationship to the total atmospheric water vapour amount over land surfaces. The difference in brightness temperature between the AVHRR channel 4 and 5 (10-3-11.3 mum and 11.4-12.3 mum respectively) was found to be a linear function of total precipitable water, for several stations in differing climatic regimes. For each individual location the total precipitable water was estimated with a standard error ranging from 0.22 to 0-48 cm for the complete range of conditions from wet to dry season or summer to winter. For mid-latitude continental locations there is very little influence of atmospheric aerosols on the relationship while for the African Sahel region the effect of large airborne particulates with a silicate component introduces a significant effect at large values of aerosol optical depth due to absorption. The influence of spectral emissivity variation in the split window region was also observed for arid regions where there is a significant quartz component to the soil. It is concluded that for regional retrieval of precipitable water, this technique provides sufficient accuracy for application to correction of near-infrared satellite data such as AVHRR channel 2 (0.71-0.98 mum), however the site specific relation between T4-T5 and PW needs to be established with independent PW measurements. C1 NASA,GODDARD SPACE FLIGHT CTR,GSFC,BIOSPHER SCI BRANCH,GREENBELT,MD 20771. RP ECK, TF (reprint author), HUGHES STX CORP,NASA,GSFC,CODE 923,GREENBELT,MD 20771, USA. RI ECK, THOMAS/D-7407-2012 NR 29 TC 37 Z9 46 U1 1 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 FEB PY 1994 VL 15 IS 3 BP 567 EP 582 PG 16 WC Remote Sensing; Imaging Science & Photographic Technology SC Remote Sensing; Imaging Science & Photographic Technology GA NA285 UT WOS:A1994NA28500006 ER PT J AU CARTER, GA AF CARTER, GA TI RATIOS OF LEAF REFLECTANCES IN NARROW WAVEBANDS AS INDICATORS OF PLANT STRESS SO INTERNATIONAL JOURNAL OF REMOTE SENSING LA English DT Article ID SPECTRAL REFLECTANCE; SLASH PINE; BLUE-SHIFT; RED EDGE; LEAVES AB Ratios of leaf reflectances that were measured within narrow wavebands (2 nm) were evaluated as indicators of plant stress. Wavebands used in ratio computation were based on earlier studies that determined the wavelength regions in which reflectance was most affected by 8 stress agents among 6 plant species. Several ratios, such as reflectance at 695 nm divided by reflectance at 670 nm (R695/R670), were affected by some but not all stress agents. However, R695/R420, R605/R760, R695/R760 and R710/R760 were significantly greater (p less-than-or-equal-to 0.05) in stressed compared with non-stressed leaves for all stress agents. The ratios that most strongly indicated plant stress were reflectance at 695 nm divided by reflectance at 420 nm or 760 nm. RP CARTER, GA (reprint author), NASA,STENNIS SPACE CTR,NSTL STN,MS 39529, USA. NR 15 TC 339 Z9 358 U1 1 U2 31 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 1994 VL 15 IS 3 BP 697 EP 703 PG 7 WC Remote Sensing; Imaging Science & Photographic Technology SC Remote Sensing; Imaging Science & Photographic Technology GA NA285 UT WOS:A1994NA28500016 ER PT J AU RODGERS, EB CHANG, SW PIERCE, HF AF RODGERS, EB CHANG, SW PIERCE, HF TI A SATELLITE OBSERVATIONAL AND NUMERICAL STUDY OF PRECIPITATION CHARACTERISTICS IN WESTERN NORTH-ATLANTIC TROPICAL CYCLONES SO JOURNAL OF APPLIED METEOROLOGY LA English DT Article ID RAINFALL; MODEL; HURRICANES; SIMULATION; EVOLUTION; HEAT AB Special Sensor Microwave/Imager (SSM/I) observations were used to examine the spatial and temporal changes of the precipitation characteristics of tropical cyclones. SSM/I observations were also combined with the results of a tropical cyclone numerical model to examine the role of inner-core diabatic heating in subsequent intensity changes of tropical cyclones. Included in the SSM/I observations were rainfall characteristics of 18 named western North Atlantic tropical cyclones between 1987 and 1989. The SSM/I rain-rate algorithm that employed the 85-GHz channel provided an analysis of the rain-rate distribution in greater detail. However, the SSM/1 algorithm underestimated the rain rates when compared to in situ techniques but appeared to be comparable to the rain rates obtained from other satellite-borne passive microwave radiometers. The analysis of SSM/I observations found that more intense systems had higher rain rates, more latent heat release, and a greater contribution from heavier rain to the total tropical cyclone rainfall. In addition, regions with the heaviest rain rates were found near the center of the most intense tropical cyclones. Observational analysis from SSM/I also revealed that the greatest rain rates in the inner-core regions were found in the right half of fast-moving tropical cyclones, while the heaviest rain rates in slow-moving tropical cyclones were found in the forward half. The combination of SSM/I observations and an interpretation of numerical model simulations revealed that the correlation between changes in the inner core diabatic heating and the subsequent intensity became greater as the tropical cyclones became more intense. C1 USN,RES LAB,WASHINGTON,DC 20375. SCI SYST & APPLICAT INC,LANHAM,MD. RP RODGERS, EB (reprint author), NASA,GODDARD SPACE FLIGHT CTR,ATMOSPHERES LAB,MESOSCALE DYNAM & PRECIPITAT BRANCH,CODE 912,GREENBELT,MD 20771, USA. NR 48 TC 44 Z9 49 U1 1 U2 1 PU AMER METEOROLOGICAL SOC PI BOSTON PA 45 BEACON ST, BOSTON, MA 02108-3693 SN 0894-8763 J9 J APPL METEOROL JI J. Appl. Meteorol. PD FEB PY 1994 VL 33 IS 2 BP 129 EP 139 DI 10.1175/1520-0450(1994)033<0129:ASOANS>2.0.CO;2 PG 11 WC Meteorology & Atmospheric Sciences SC Meteorology & Atmospheric Sciences GA MW750 UT WOS:A1994MW75000001 ER PT J AU RYBICKI, GC WILLIAMS, WS AF RYBICKI, GC WILLIAMS, WS TI DEEP-LEVEL DEFECTS IN PROTON-IRRADIATED ZN AND CD DOPED INP SO JOURNAL OF APPLIED PHYSICS LA English DT Article ID TRANSIENT SPECTROSCOPY; SOLAR-CELLS; CENTERS; DAMAGE; TRAPS AB InP is a relatively radiation-resistant semiconductor and an attractive material for solar cells exposed to radiation in Earth orbit. To better understand this useful property of InP, proton irradiation induced defects in Zn and Cd doped InP have been studied by deep level transient spectroscopy. After 2 MeV proton irradiation the defects H3, H4, and H5 were observed in lightly Zn doped InP, while the defects H3 and H5 were observed in more heavily Zn and Cd doped InP. The concentrations of the irradiation induced defects were measured and the introduction rates were calculated and compared. The activation energies of the defects were measured and corrected for the effect of electric field on carrier emission. The capture cross sections of the defects were measured directly by the pulse width variation technique. The energy levels and capture cross sections of the defects were not affected by the substitution of Cd for Zn, but the introduction rate of the defect H5 was substantially lower in Cd doped InP, suggesting that this material would make an improved solar cell in a high radiation environment. C1 CASE WESTERN RESERVE UNIV,DEPT MAT SCI & ENGN,CLEVELAND,OH 44106. RP RYBICKI, GC (reprint author), NASA,LEWIS RES CTR,PHOTOVOLTA BRANCH,CLEVELAND,OH 44135, USA. NR 14 TC 5 Z9 5 U1 1 U2 2 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0021-8979 J9 J APPL PHYS JI J. Appl. Phys. PD FEB 1 PY 1994 VL 75 IS 3 BP 1384 EP 1389 DI 10.1063/1.356418 PG 6 WC Physics, Applied SC Physics GA MW522 UT WOS:A1994MW52200019 ER PT J AU ISMAIL, S BROWELL, EV AF ISMAIL, S BROWELL, EV TI RECENT LIDAR TECHNOLOGY DEVELOPMENTS AND THEIR INFLUENCE ON MEASUREMENTS OF TROPOSPHERIC WATER-VAPOR SO JOURNAL OF ATMOSPHERIC AND OCEANIC TECHNOLOGY LA English DT Article AB In this paper the influences of recent technology developments in the areas of lasers, detectors, and optical filters of a differential absorption lidar (DIAL) system on the measurement of tropospheric water vapor (H2O) profiles are discussed. The lidar parameters selected are based upon a diode-seeded Ti:sapphire laser that is locked to an H2O line in the 820- or 930-nm band Of H2O. To assess the influence of the mode of deployment on the measurement of tropospheric H2O, DIAL performance is evaluated for operation from a medium-altitude (12 km) aircraft, the ground, and space-based systems. It is found that incorporation of these developments could greatly enhance DIAL measurement capability. RP ISMAIL, S (reprint author), NASA,LANGLEY RES CTR,DIV ATMOSPHER SCI,CHEM & DYNAM BRANCH,MAIL STOP 401-A,HAMPTON,VA 23665, USA. NR 0 TC 8 Z9 8 U1 0 U2 0 PU AMER METEOROLOGICAL SOC PI BOSTON PA 45 BEACON ST, BOSTON, MA 02108-3693 SN 0739-0572 J9 J ATMOS OCEAN TECH JI J. Atmos. Ocean. Technol. PD FEB PY 1994 VL 11 IS 1 BP 76 EP 84 DI 10.1175/1520-0426(1994)011<0076:RLTDAT>2.0.CO;2 PN 1 PG 9 WC Engineering, Ocean; Meteorology & Atmospheric Sciences SC Engineering; Meteorology & Atmospheric Sciences GA MV460 UT WOS:A1994MV46000009 ER PT J AU BURKE, WJ BASINSKA, EM MAYNARD, NC HANSON, WB SLAVIN, JA WINNINGHAM, JD AF BURKE, WJ BASINSKA, EM MAYNARD, NC HANSON, WB SLAVIN, JA WINNINGHAM, JD TI POLAR-CAP POTENTIAL DISTRIBUTIONS DURING PERIODS OF POSITIVE IMF BY AND BZ SO JOURNAL OF ATMOSPHERIC AND TERRESTRIAL PHYSICS LA English DT Article; Proceedings Paper CT Symposium on Geophysical Phenomena in the Polar Cap during Northward Interplanetary Magnetic Field, at the XX IUGG General Assembly CY AUG 23, 1991 CL VIENNA, AUSTRIA SP INT UNION GEODESY & GEOPHYS, INT ASSOC GEOMAGNETISM & AERON ID INTERPLANETARY MAGNETIC-FIELD; BOUNDARY-LAYER; LOW-ALTITUDE; BIRKELAND CURRENTS; ELECTRON FLUXES; MAGNETOPAUSE; NORTHWARD; PLASMA; CUSP; MAGNETOSPHERE AB We compare the DE-2 electric field measurements used by HEPPNER and MAYNARD [(1987) J. geophys. Res. 92, 4467] to illustrate strongly distorted, BC convection patterns for IMF B(Z) > 0 and large \B(Y)\, with simultaneous detections of particle spectra, plasma drifts and magnetic perturbations. Measured potentials >50 keV, driven by the solar wind speeds exceeding 500 km/s, are greater than published correlation analysis predictions by up to 27%. The potential distributions show only two extrema and thus support the basic conclusion that under these conditions the solar wind/IMF drives two- rather than four-cell convection patterns. However, several aspects of the distorted two-cell convection pattern must be revised. In addition to the strong east-west convection in the vicinity of the cusp, indicated by Heppner and Maynard, we also detect comparable components of sunward (equatorward) plasma flow. Combined equipotential and particle precipitation distributions indicate the presence of a lobe cell embedded within the larger, afternoon reconnection cell. Both types rotate in the same sense, with the lobe cell carrying 20-40% of the total afternoon cell potential. We detected no lobe cell within morning convection cell. C1 UNIV TEXAS,RICHARDSON,TX 75080. NASA,GODDARD SPACE FLIGHT CTR,GREENBELT,MD 20771. SW RES INST,SAN ANTONIO,TX 78284. BOSTON UNIV,CTR SPACE PHYS,BOSTON,MA 02215. RP BURKE, WJ (reprint author), PL GPSG,GEOPHYS DIRECTORATE,BEDFORD,MA 01731, USA. RI Slavin, James/H-3170-2012 OI Slavin, James/0000-0002-9206-724X NR 39 TC 11 Z9 11 U1 0 U2 1 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0021-9169 J9 J ATMOS TERR PHYS JI J. Atmos. Terr. Phys. PD FEB PY 1994 VL 56 IS 2 BP 209 EP 221 DI 10.1016/0021-9169(94)90031-0 PG 13 WC Meteorology & Atmospheric Sciences SC Meteorology & Atmospheric Sciences GA MM182 UT WOS:A1994MM18200006 ER PT J AU ZANDER, R MAHIEU, E DEMOULIN, P RINSLAND, CP WEISENSTEIN, DK KO, MKW SZE, ND GUNSON, MR AF ZANDER, R MAHIEU, E DEMOULIN, P RINSLAND, CP WEISENSTEIN, DK KO, MKW SZE, ND GUNSON, MR TI SECULAR EVOLUTION OF THE VERTICAL COLUMN ABUNDANCES OF CHCLF2 (HCFC-22) IN THE EARTHS ATMOSPHERE INFERRED FROM GROUND-BASED IR SOLAR OBSERVATIONS AT THE JUNGFRAUJOCH AND AT KITT-PEAK, AND COMPARISON WITH MODEL-CALCULATIONS SO JOURNAL OF ATMOSPHERIC CHEMISTRY LA English DT Article DE CHCLF2; ATMOSPHERIC COMPOSITION; INFRARED SOLAR OBSERVATIONS ID INFRARED SPECTROSCOPIC MEASUREMENTS; LOWER STRATOSPHERE; CFC-22; INCREASE; SPECTRA; GASES; CFC-113; F-22 AB Series of high-resolution infrared solar spectra recorded at the International Scientific Station of the Jungfraujoch, Switzerland, between 06/1986 and 11/1992, and at Kitt Peak National Observatory, Tucson, Arizona (U.S.A.), from 12/1980 to 04/1992, have been analyzed to provide a comprehensive ensemble of vertical column abundances of CHClF2 (HCFC-22; Freon-22) above the European and the North American continents. The columns were derived from nonlinear least-squares curve fittings between synthetic spectra and the observations containing the unresolved 2nu6 Q-branch absorption of CHClF2 at 829.05 cm-1. The changes versus time observed in these columns were modeled assuming both an exponential and a linear increase with time. The exponential rates of increase at one-sigma uncertainties were found equal to (7.0 +/- 0.35)%/yr for the Junfraujoch data and (7.0 +/- 0.23)%/yr for the Kitt Peak data. The exponential trend of 7.0%/yr found at both stations widely separated in location can be considered as representative of the global increase of the CHClF2 burden in the Earth's atmosphere during the period 1980 to 1992. When assuming two realistic vertical volume mixing ratio profiles for CHClF2 in the troposphere, one quasi constant and the other decreasing by about 13% from the ground to the tropopause, the concentrations for mid-1990 were found to lie between 97 and 111 pptv (parts per trillion by volume) at the 3.58 km altitude of the Jungfraujoch and between .97 and 103 pptv at Kitt Peak, 2.09 km above sea level. Corresponding values derived from calculations using a high vertical resolution-2D model and recently compiled HCFC-22 releases to the atmosphere, were equal to 107 and 105 pptv, respectively, in excellent agreement with the measurements. The model calculated lifetime of CHClF2 was found equal to 15.6 years. The present results are compared critically with similar data found in the literature. On average, the concentrations found here are lower by 15-20% than those derived from in situ investigations; this difference cannot be explained by the absolute uncertainty of +/- 11% assigned presently to the infrared remote measurements. C1 NASA,LANGLEY RES CTR,DIV ATMOSPHER SCI,HAMPTON,VA 23681. ATMOSPHER & ENVIRONM RES INC,CAMBRIDGE,MA 02139. JET PROP LAB,PASADENA,CA 91109. RP ZANDER, R (reprint author), UNIV LIEGE,INST ASTROPHYS,B-4000 LIEGE,BELGIUM. RI Ko, Malcolm/D-5898-2015 NR 43 TC 14 Z9 14 U1 0 U2 0 PU KLUWER ACADEMIC PUBL PI DORDRECHT PA SPUIBOULEVARD 50, PO BOX 17, 3300 AA DORDRECHT, NETHERLANDS SN 0167-7764 J9 J ATMOS CHEM JI J. Atmos. Chem. PD FEB PY 1994 VL 18 IS 2 BP 129 EP 148 DI 10.1007/BF00696811 PG 20 WC Environmental Sciences; Meteorology & Atmospheric Sciences SC Environmental Sciences & Ecology; Meteorology & Atmospheric Sciences GA NN705 UT WOS:A1994NN70500002 ER PT J AU BACK, LH AF BACK, LH TI ESTIMATED MEAN FLOW RESISTANCE INCREASE DURING CORONARY-ARTERY CATHETERIZATION SO JOURNAL OF BIOMECHANICS LA English DT Article ID TRANSSTENOTIC PRESSURE-GRADIENT; ANGIOPLASTY; VALIDATION; VELOCITY; STENOSES; HUMANS AB The purpose of this investigation is to examine the influence of the presence and size of the catheter on the measurement of mean pressure drop and, thus, flow resistance in coronary vessels. Relatively large mean translesional pressure gradients have been reported, but they may be due to obstruction effects. To evaluate this hypothesis, analytical Bow modeling coupled with in vitro experimental evidence was used to estimate mean flow resistance increases due to the presence of a catheter in a proximal vessel for concentric and eccentric catheter configurations. For an angioplasty catheter, over the relative range of catheter size to coronary vessel size (d(i)/d(o),) from 0.3 to 0.7 (which is currently being used clinically), the flow resistance increased by a large factor of 3-33 for the concentric configuration. For smaller infusion catheters, the Bow resistance increase was less, although still appreciable. Very small angioplasty guidewire also leads to sizeable increases in flow resistance. Effects of catheter eccentricity also indicated substantial increases in Bow resistance, although the magnitude was less. These initial results might be used by clinicians to obtain rough estimates of actual mean pressure gradients in vivo in relatively straight proximal segments of artery from values measured with catheters. Since catheters are used so widely clinically, these initial results may be useful also for other vessels in the vascular system where the mean flow is describable by the Poiseuille relation. Whereas there is reasonable confidence in the Row modeling methodology, hemodynamic data are needed to evaluate the actual magnitude of the effects of obstruction in vivo. C1 CALTECH,JET PROP LAB,PASADENA,CA 91109. NR 20 TC 46 Z9 46 U1 0 U2 2 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0021-9290 J9 J BIOMECH JI J. Biomech. PD FEB PY 1994 VL 27 IS 2 BP 169 EP 175 DI 10.1016/0021-9290(94)90205-4 PG 7 WC Biophysics; Engineering, Biomedical SC Biophysics; Engineering GA MU059 UT WOS:A1994MU05900005 PM 8132684 ER PT J AU MONKS, PS STIEF, LJ KRAUSS, M KUO, SC KLEMM, RB AF MONKS, PS STIEF, LJ KRAUSS, M KUO, SC KLEMM, RB TI A DISCHARGE FLOW-PHOTOIONIZATION MASS-SPECTROMETRIC STUDY OF HOBR(X (1)A') - PHOTOION YIELD SPECTRUM, IONIZATION-ENERGY, AND THERMOCHEMISTRY SO JOURNAL OF CHEMICAL PHYSICS LA English DT Article ID COMPACT EFFECTIVE POTENTIALS; EXPONENT BASIS-SETS; ABSORPTION-SPECTRUM; BROMINE; EFFICIENT; RADICALS; KINETICS; ATOMS AB The photoion yield spectrum of HOBr was measured over the wavelength range lambda= 108-121 nm; by using a discharge flow-photoionization mass spectrometer apparatus coupled to a synchrotron radiation source. HOBr was generated by the reaction of OH with molecular bromine. A value of(10.62+/-0.04) eV was obtained for the adiabatic ionization energy (I.E.) of HOBr from photoion thresholds, corresponding to the HOBr+((2)A'') <--HOBr((1)A') transition. The structure observed in the spectrum is discussed in terms of the available states for HOBr+, which have been determined using multiconfiguration-self-consistent field calculations. A new value for Delta H-f(0) (298)(HOBr) of-9 kcal mel(-1) is derived from I.E.(HOBr) and estimates of Delta H-f(HOBr+). C1 NIST,CTR ADV RES BIOTECHNOL,ROCKVILLE,MD 20850. BROOKHAVEN NATL LAB,UPTON,NY 11973. RP MONKS, PS (reprint author), NASA,GODDARD SPACE FLIGHT CTR,EXTRATERR PHYS LAB,GREENBELT,MD 20771, USA. RI Monks, Paul/H-6468-2016 OI Monks, Paul/0000-0001-9984-4390 NR 30 TC 32 Z9 32 U1 0 U2 1 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0021-9606 J9 J CHEM PHYS JI J. Chem. Phys. PD FEB 1 PY 1994 VL 100 IS 3 BP 1902 EP 1907 DI 10.1063/1.466543 PG 6 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA MU316 UT WOS:A1994MU31600014 ER PT J AU DRUYAN, LM HALL, TM AF DRUYAN, LM HALL, TM TI STUDIES OF AFRICAN WAVE DISTURBANCES WITH THE GISS-GCM SO JOURNAL OF CLIMATE LA English DT Article ID SUB-SAHARAN DROUGHT; EASTERLY WAVES; TROPICAL ATLANTIC; PHASE III; RAINFALL; CLIMATE; MODEL; GATE AB Simulations made with the general circulation model of the NASA/Goddard Institute for Space Studies (GISS GCM) run at 4-degrees latitude by 5-degrees longitude horizontal resolution are analyzed to determine the model's representation of African wave disturbances. Waves detected in the model's lower troposphere over northern Africa during the summer monsoon season exhibit realistic wavelengths of about 2200 km. However, power spectra of the meridional wind show that the waves propagate westward too slowly, with periods of 5-10 days, about twice the observed values. This sluggishness is most pronounced during August, consistent with simulated 600-mb zonal winds that are only about half the observed speeds of the midtropospheric jet. The modeled wave amplitudes are strongest over West Africa during the first half of the summer but decrease dramatically by September, contrary to observational evidence. Maximum amplitudes occur at realistic latitudes, 12-degrees-20-degrees-N, but not as observed near the Atlantic coast. Spectral analyses suggest some wave modulation of precipitation in the 5-8-day band, and compositing shows that precipitation is slightly enhanced east of the wave trough, coincident with southerly winds. Extrema of low-level convergence west of the wave troughs, coinciding with northerly winds, were not preferred areas for simulated precipitation, probably because of the drying effect of this advection, as waves were generally north of the humid zone. The documentation of African wave disturbances in the GISS GCM is a first step toward considering wave influences in future GCM studies of Sahel drought. RP DRUYAN, LM (reprint author), COLUMBIA UNIV,NASA,GODDARD INST SPACE STUDIES,2880 BROADWAY,NEW YORK,NY 10025, USA. NR 36 TC 19 Z9 19 U1 1 U2 1 PU AMER METEOROLOGICAL SOC PI BOSTON PA 45 BEACON ST, BOSTON, MA 02108-3693 SN 0894-8755 J9 J CLIMATE JI J. Clim. PD FEB PY 1994 VL 7 IS 2 BP 261 EP 276 DI 10.1175/1520-0442(1994)007<0261:SOAWDW>2.0.CO;2 PG 16 WC Meteorology & Atmospheric Sciences SC Meteorology & Atmospheric Sciences GA MX213 UT WOS:A1994MX21300004 ER PT J AU SINGH, NB STEWART, AM HAMACHER, RD TALVACCHIO, J MAZELSKY, R SANTORO, GJ DUVAL, WMB DEWITT, R AF SINGH, NB STEWART, AM HAMACHER, RD TALVACCHIO, J MAZELSKY, R SANTORO, GJ DUVAL, WMB DEWITT, R TI EFFECT OF THERMAL-CONVECTION ON THE QUALITY OF LEAD BROMIDE CRYSTALS SO JOURNAL OF CRYSTAL GROWTH LA English DT Letter ID GROWTH AB Lead bromide crystals were grown from the melt by the Bridgman method. Thermal Rayleigh number was varied three orders of magnitude to study the effect of convection on the quality of crystals. Crystals were characterized by studying X-ray rocking curves, X-ray contour scans, and chemical etchpits. The crystal grown at the lowest thermal Rayleigh number showed highest quality and the crystal grown at the highest thermal Rayleigh number showed worst quality. C1 NASA,LEWIS RES CTR,CLEVELAND,OH 44135. RP SINGH, NB (reprint author), WESTINGHOUSE ELECT CORP,CTR SCI & TECHNOL,1310 BEULAH RD,PITTSBURGH,PA 15235, USA. NR 2 TC 6 Z9 6 U1 0 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0022-0248 J9 J CRYST GROWTH JI J. Cryst. Growth PD FEB PY 1994 VL 135 IS 3-4 BP 619 EP 622 DI 10.1016/0022-0248(94)90155-4 PG 4 WC Crystallography; Materials Science, Multidisciplinary; Physics, Applied SC Crystallography; Materials Science; Physics GA MZ054 UT WOS:A1994MZ05400030 ER PT J AU NOOR, AK PETERS, JM BURTON, WS AF NOOR, AK PETERS, JM BURTON, WS TI 3-DIMENSIONAL SOLUTIONS FOR INITIALLY STRESSED STRUCTURAL SANDWICHES SO JOURNAL OF ENGINEERING MECHANICS-ASCE LA English DT Article ID COMPOSITE AB Three-dimensional solutions are presented for the buckling and free vibrations of sandwich panels with composite face sheets subjected to combined temperature change and applied edge compression. Sensitivity coefficients are also evaluated and used to study the sensitivity of the buckling and free-vibration responses to variations in the different lamination and material parameters of the panel. The temperature is assumed to be uniform, and the material properties are assumed to be independent of temperature. Numerical results are presented showing the effects of variations in geometric, material, and lamination parameters on the stability boundary, vibrational response, and sensitivity coefficients of initially stressed, simply supported sandwich panels. Also, the contributions of the in-plane and transverse stresses, in the face sheets and the core, to the strain energy associated with the buckling and vibration modes are studied, thereby providing insight into the permissible approximations in modeling of structural sandwiches. RP NOOR, AK (reprint author), UNIV VIRGINIA,NASA LANGLEY RES CTR,CTR COMPUTAT STRUCT TECH,HAMPTON,VA 23681, USA. NR 25 TC 64 Z9 66 U1 0 U2 3 PU ASCE-AMER SOC CIVIL ENGINEERS PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017-2398 SN 0733-9399 J9 J ENG MECH-ASCE JI J. Eng. Mech.-ASCE PD FEB PY 1994 VL 120 IS 2 BP 284 EP 303 DI 10.1061/(ASCE)0733-9399(1994)120:2(284) PG 20 WC Engineering, Mechanical SC Engineering GA MT463 UT WOS:A1994MT46300006 ER PT J AU OLSEN, RC SCOTT, LJ BOARDSEN, SA AF OLSEN, RC SCOTT, LJ BOARDSEN, SA TI COMPARISON BETWEEN LIOUVILLES THEOREM AND OBSERVED LATITUDINAL DISTRIBUTIONS OF TRAPPED IONS IN THE PLASMAPAUSE REGION SO JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS LA English DT Article ID EARTHS MAGNETIC EQUATOR; PLASMASPHERE; POPULATIONS; PARTICLE; DAYSIDE; FIELD AB The presence of anisotropic plasma distributions, trapped at the Earth's magnetic equator, has consequences for the electric field structure which must exist in equilibrium along the magnetic field line. Data from SCATHA and Dynamics Explorer 1 indicate that the core ion distributions at the magnetic equator can be well described as bi-Maxwellian distributions, with a perpendicular temperature an order of magnitude larger than the parallel temperature. A collisionless model is developed for the variation in plasma parameters, following the forms developed by Whipple (1977). If the core electron anisotropy is low, the resulting electric field of similar to 0.1 mu V m(-1) is pointed away from the equator. Under these conditions the self-consistent electric field will not overcome the effects of magnetic trapping. The resulting potential distribution results in a local maximum in total plasma density at the equator. Only when the electron distribution is primarily field-aligned can there be a density minimum at the equator. Comparisons are made between this model and the observed variations in DE 1 plasma parameters with latitude. C1 NASA,MSFC,SPACE SCI LAB,HUNTSVILLE,AL 35812. RP OLSEN, RC (reprint author), USN,POSTGRAD SCH,DEPT PHYS,MONTEREY,CA 93943, USA. RI Olsen, Richard/O-2699-2015 OI Olsen, Richard/0000-0002-8344-9297 NR 38 TC 21 Z9 21 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 1994 VL 99 IS A2 BP 2191 EP 2203 DI 10.1029/93JA02776 PG 13 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA MV286 UT WOS:A1994MV28600010 ER PT J AU STERN, DP AF STERN, DP TI EULER POTENTIALS OF CURRENT-FREE FIELDS EXPRESSED IN SPHERICAL-HARMONICS SO JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS LA English DT Article AB Given a magnetic field B = -del gamma with gamma expanded in spherical harmonics, it is shown that analytic Euler potentials may be derived for B if gamma is asymmetrical but contains only the contribution of a single index n. This work generalizes a result for sectorial harmonics with n = m, derived by Willis and Gardiner (1988). RP STERN, DP (reprint author), NASA,GODDARD SPACE FLIGHT CTR,EXTRATERR PHYS LAB,CODE 695,GREENBELT,MD 20771, USA. NR 11 TC 7 Z9 7 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 1994 VL 99 IS A2 BP 2443 EP 2445 DI 10.1029/93JA03168 PG 3 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA MV286 UT WOS:A1994MV28600031 ER PT J AU BURKE, WJ MACHUZAK, JS MAYNARD, NC BASINSKA, EM ERICKSON, GM HOFFMAN, RA SLAVIN, JA HANSON, WB AF BURKE, WJ MACHUZAK, JS MAYNARD, NC BASINSKA, EM ERICKSON, GM HOFFMAN, RA SLAVIN, JA HANSON, WB TI AURORAL IONOSPHERIC SIGNATURES OF THE PLASMA SHEET BOUNDARY-LAYER IN THE EVENING SECTOR SO JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS LA English DT Article ID FIELD-ALIGNED CURRENTS; ELECTRON FLUXES; MAGNETIC-FIELD; POLAR-CAP; STATISTICAL-MODEL; ION DISTRIBUTIONS; GEOMAGNETIC TAIL; PRECIPITATION; ISEE-1; MAGNETOTAIL AB We report on particles and fields observed during Defense Meteorological Satellite Program (DMSP) F9 and DE 2 crossings of the polar cap/auroral oval boundary in the evening MLT sector. Season-dependent, latitudinally narrow regions of rapid, eastward plasma flows were encountered by DMSP near the poleward boundary of auroral electron precipitation. Ten DE 2 orbits exhibiting electric field spikes that drive these plasma flows were chosen for detailed analysis. The boundary region is characterized by pairs of oppositely-directed, field-aligned current sheets. The more poleward of the two current sheets is directed into the ionosphere. Within this downward current sheet, precipitating electrons either had average energies of a few hundred eV or were below polar rain flux levels. Near the transition to upward currents, DE 2 generally detected intense fluxes of accelerated electrons and weak fluxes of ions, both with average energies between 5 and 12 keV. fn two instances, precipitating ions with energies >5 keV spanned both current sheets. Comparisons with satellite measurements at higher altitudes suggest that the particles and fields originated in the magnetotail inside the distant reconnection region and propagated to Earth through the plasma sheet boundary layer. Auroral electrons are accelerated by parallel electric fields produced by the different pitch angle distributions of protons and electrons in this layer interacting with the near-Earth magnetic mirror. Electric field spikes driving rapid plasma flows along the poleward boundaries of intense, keV electron precipitation represent ionospheric responses to the field-aligned currents and conductivity gradients. The generation of field-aligned currents in the boundary layer may be understood qualitatively as resulting from the different rates of earthward drift; for electrons and protons in the magnetotail's current sheet. C1 BOSTON UNIV,CTR SPACE PHYS,BOSTON,MA 02215. GODDARD SPACE FLIGHT CTR,GREENBELT,MD 20771. UNIV TEXAS,RICHARDSON,TX 75080. RP BURKE, WJ (reprint author), PHILLIPS LAB,BEDFORD,MA 01731, USA. RI Slavin, James/H-3170-2012 OI Slavin, James/0000-0002-9206-724X NR 45 TC 26 Z9 26 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 1994 VL 99 IS A2 BP 2489 EP 2499 DI 10.1029/93JA02363 PG 11 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA MV286 UT WOS:A1994MV28600035 ER PT J AU NEUGEBAUER, M GOLDSTEIN, BE BAME, SJ FELDMAN, WC AF NEUGEBAUER, M GOLDSTEIN, BE BAME, SJ FELDMAN, WC TI ULYSSES NEAR-ECLIPTIC OBSERVATIONS OF DIFFERENTIAL FLOW BETWEEN PROTONS AND ALPHAS IN THE SOLAR-WIND SO JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS LA English DT Article ID HELIUM; HYDROGEN; 1-AU AB The evolution of differential streaming between protons and alpha particles in the solar wind was observed with the solar wind plasma experiment on the Ulysses spacecraft over the solar range of 1.15 to 5.40 AU between November 18, 1990, and May 5, 1992. The correlation of the difference in ion speeds, Delta V=\V-alpha\-\V-p\, with the proton speed V-p observed by other spacecraft at solar distances less than or equal to 1 AU disappeared at similar to 2 AU. At solar distances greater than or equal to 2.85 AU, the largest values of both V-alpha p=\V-alpha p\=\V-alpha-VP\ and \Delta V\ were found in the interaction regions on the leading edges of high-speed streams. The differential; streaming was typically enhanced just downstream of strong forward and reverse shocks, and large negative values of Delta V were frequently encountered in the interaction regions. A correlation between V-alpha p and the ratio tau(c)/tau(e) of Coulomb collision time to expansion time was observed at all distances,but it is suggested that at the larger values of tau(c)/tau(e) the observed correlation may arise from enhanced production of differential streaming by processes that also increase the entropy of the solar wind protons. C1 LOS ALAMOS NATL LAB,LOS ALAMOS,NM 87544. RP NEUGEBAUER, M (reprint author), CALTECH,JET PROP LAB,4800 OAK GROVE DR,MS 169-506,PASADENA,CA 91109, USA. NR 23 TC 33 Z9 33 U1 2 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 1994 VL 99 IS A2 BP 2505 EP 2511 DI 10.1029/93JA02615 PG 7 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA MV286 UT WOS:A1994MV28600037 ER PT J AU RICHARDSON, IG FARRUGIA, CJ WINTERHALTER, D AF RICHARDSON, IG FARRUGIA, CJ WINTERHALTER, D TI SOLAR-ACTIVITY AND CORONAL MASS EJECTIONS ON THE WESTERN-HEMISPHERE OF THE SUN IN MID-AUGUST 1989 - ASSOCIATION WITH INTERPLANETARY OBSERVATIONS AT THE ICE AND IMP-8 SPACECRAFT SO JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS LA English DT Article ID ENERGETIC PARTICLES; ISEE-C; SHOCKS; FLARES AB During the 10-day period from August 12 to 21, 1989, a sequence of coronal mass ejections (CMEs) was observed above the west limb of the Sun by the Solar Maximum Mission (SMM) coronagraph. Most of these CMEs apparently originated in the vicinity of one particularly active region during its passage from near central meridian to behind the west limb of the Sun. We present observations made at 1 AU during this period by the ICE (formerly ISEE 3) and IMP 8 spacecraft which were separated by similar to 75 degrees in heliolongitude. Following CMEs on August 12 associated with solar events at similar to W40 degrees, IMP 8 (in Earth orbit) detected a strong shock followed by signatures in magnetic field, solar wind plasma, and energetic ion data which suggest that CME-related material (''ejecta'') forming the shock driver engulfed the spacecraft. This spacecraft only observed weak shocks, and no ejecta, from later CMEs originating further west of the spacecraft. In contrast ICE, off the west limb at similar to W75 degrees, observed the shock from the W40 degrees event but failed to encounter the shock driver, whereas clear ejecta signatures were observed following events further west, closer to the spacecraft heliolongitude. The disappearance of these signatures (which include bidirectional energetic ion flows, bidirectional solar wind heat fluxes, quiet, enhanced magnetic fields and anomalously cool plasma) at IMP 8 and their emergence at ICE as the solar source region moved westward supports the association of such signatures with ejecta related to CMEs. The dual-spacecraft observations are also consistent with the conclusion of Richardson and Cane (1993) that ejecta at 1 AU typically extend similar to 50 degrees in longitude from the solar source. Some plausible associations between particular intervals of ejecta signatures at ICE and individual CMEs are made. However, these associations are complicated by the large number of CMEs present, by intermittent ICE data coverage, and by uncertainties in the ejecta propagation speeds to the spacecraft. C1 NASA,GODDARD SPACE FLIGHT CTR,EXTRATERR PHYS LAB,GREENBELT,MD 20771. CALTECH,JET PROP LAB,PASADENA,CA 91109. UNIV MARYLAND,DEPT ASTRON,COLL PK,MD 20742. RP RICHARDSON, IG (reprint author), NASA,GODDARD SPACE FLIGHT CTR,HIGH ENERGY ASTROPHYS LAB,CODE 661,GREENBELT,MD 20771, USA. OI Richardson, Ian/0000-0002-3855-3634 NR 34 TC 15 Z9 15 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 1994 VL 99 IS A2 BP 2513 EP 2529 DI 10.1029/93JA02904 PG 17 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA MV286 UT WOS:A1994MV28600038 ER PT J AU STRIBLING, T MATTHAEUS, WH GHOSH, S AF STRIBLING, T MATTHAEUS, WH GHOSH, S TI NONLINEAR DECAY OF MAGNETIC HELICITY IN MAGNETOHYDRODYNAMIC TURBULENCE WITH A MEAN MAGNETIC-FIELD SO JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS LA English DT Article ID NUMERICAL-SIMULATION; RELAXATION AB We show that the magnetic helicity associated with fluctuations in homogeneous incompressible magnetohydrodynamic (MHD) turbulence with a mean magnetic field decays in time because of nonlinear processes. Evidence is obtained numerically, by use of both dissipative and nondissipative spectral method simulations. The described effect stands in contrast to expectations based on studies of MHD turbulence without an applied mean field, in which magnetic helicity is transferred nonlinearly to long wavelengths and is preserved in time because of selective decay when dissipation is present. The process of nonlinear decay is described in terms of a generalized ideal helicity invariant and is characterized by the transient production of a mean induced electric field aligned with the applied magnetic field an effect reminiscent of the alpha effect in dynamo theory. A simple phenomenological model for the decay process is proposed. C1 UNIV DELAWARE,BARTOL RES INST,NEWARK,DE 19716. RP STRIBLING, T (reprint author), NASA,GODDARD SPACE FLIGHT CTR,EXTRATERR PHYS LAB,CODE 692,GREENBELT,MD 20771, USA. NR 27 TC 38 Z9 38 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 1994 VL 99 IS A2 BP 2567 EP 2576 DI 10.1029/93JA02962 PG 10 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA MV286 UT WOS:A1994MV28600042 ER PT J AU LEPPING, RP JONES, JA BURLAGA, LF AF LEPPING, RP JONES, JA BURLAGA, LF TI MAGNETIC-FIELD STRUCTURE OF INTERPLANETARY MAGNETIC CLOUDS AT 1 AU - REPLY SO JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS LA English DT Note C1 HUGHES ST SYST CORP,LANHAM,MD 20706. RP LEPPING, RP (reprint author), NASA,GODDARD SPACE FLIGHT CTR,EXTRATERR PHYS LAB,GREENBELT,MD 20771, USA. NR 9 TC 0 Z9 0 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 1994 VL 99 IS A2 BP 2581 EP 2583 DI 10.1029/93JA00990 PG 3 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA MV286 UT WOS:A1994MV28600044 ER PT J AU BACK, LH MASSIER, PF AF BACK, LH MASSIER, PF TI HEAT-TRANSFER FROM A VERY HIGH-TEMPERATURE LAMINAR GAS-FLOW WITH SWIRL TO A COOLED CIRCULAR TUBE AND NOZZLE SO JOURNAL OF HEAT TRANSFER-TRANSACTIONS OF THE ASME LA English DT Article DE FORCED CONVECTION; HIGH-TEMPERATURE PHENOMENA; ROTATING FLOWS AB An experimental investigation was carried out to appraise the effect of swirl on heat transfer in the laminar boundary layer development region in a highly cooled tube and nozzle. The ratio of gas-side wall-temperature-to-stagnation-temperature ranged from 0.095 to 0.135. In the swirling flow of argon with ratio of peak-tangential-velocity-to-axial velocity of 3.6 at the injection port, the level of heat transfer to the tube wall was increased from 200 to 60 percent above the level without swirl. In the swirling flows, the wall heat flux level was significantly higher in the tube than in the nozzle downstream. Because of the relatively high heat transfer to the wall, there were appreciable reductions in stagnation enthalpy in the flows that spanned a range of Reynolds numbers from about 360 to 500. RP BACK, LH (reprint author), JET PROP LAB,PASADENA,CA 91109, USA. NR 18 TC 2 Z9 2 U1 0 U2 0 PU ASME-AMER SOC MECHANICAL ENG PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 SN 0022-1481 J9 J HEAT TRANS-T ASME JI J. Heat Transf.-Trans. ASME PD FEB PY 1994 VL 116 IS 1 BP 35 EP 39 DI 10.1115/1.2910880 PG 5 WC Thermodynamics; Engineering, Mechanical SC Thermodynamics; Engineering GA MY986 UT WOS:A1994MY98600005 ER PT J AU FIJANY, A SCHEID, RE AF FIJANY, A SCHEID, RE TI FAST PARALLEL PRECONDITIONED CONJUGATE-GRADIENT ALGORITHMS FOR ROBOT MANIPULATOR DYNAMICS SIMULATION SO JOURNAL OF INTELLIGENT & ROBOTIC SYSTEMS LA English DT Article DE PRECONDITIONED CONJUGATE GRADIENT ALGORITHMS; ROBOT MANIPULATOR DYNAMICS; FORWARD DYNAMICS PROBLEM ID COMPUTATION AB In this paper fast parallel Preconditioned Conjugate Gradient (PCG) algorithms for robot manipulator forward dynamics, or dynamic simulation, problem are presented. By exploiting the inherent structure of the forward dynamics problem, suitable preconditioners are devised to accelerate the iterations. Also, based on the choice of preconditioners, a modified dynamic formulation is used to speedup both serial and parallel computation of each iteration. The implementation of the parallel algorithms on two interconnected processor arrays is discussed and their computation and communication complexities are analyzed. The simulation results for a Puma Arm are presented to illustrate the effectiveness of the proposed preconditioners. With a faster convergence due to preconditioning and a faster computation of iterations due to parallelization, the developed parallel PCG algorithms represent the fastest alternative for parallel computation of the problem with O(n) processors. RP JET PROP LAB, PASADENA, CA 91109 USA. NR 27 TC 1 Z9 1 U1 0 U2 0 PU SPRINGER PI DORDRECHT PA VAN GODEWIJCKSTRAAT 30, 3311 GZ DORDRECHT, NETHERLANDS SN 0921-0296 EI 1573-0409 J9 J INTELL ROBOT SYST JI J. Intell. Robot. Syst. PD FEB PY 1994 VL 9 IS 1-2 BP 73 EP 99 DI 10.1007/BF01258314 PG 27 WC Computer Science, Artificial Intelligence; Robotics SC Computer Science; Robotics GA NP720 UT WOS:A1994NP72000005 ER PT J AU VOLPE, R KHOSLA, P AF VOLPE, R KHOSLA, P TI COMPUTATIONAL CONSIDERATIONS IN THE IMPLEMENTATION OF FORCE CONTROL STRATEGIES SO JOURNAL OF INTELLIGENT & ROBOTIC SYSTEMS LA English DT Article DE FORCE CONTROL; IMPEDANCE CONTROL; IMPACT CONTROL; REAL-TIME ROBOTIC SYSTEMS ID MANIPULATORS AB This paper discusses computational and experimental details necessary for successfully implementing and evaluating a wide variety of force control strategies. First, a review of both explicit force and impedance control strategies is provided. Second, the basic computational requirements of these schemes are discussed, and the hardware and timing information for our implementation is provided. Third, computational problems such as noise filtering and sampling rates are explained and discussed in detail. Finally, a review of the experimental results obtained is provided. These results support the previous discussions by demonstrating the importance of fully considering the implementational details required for successful force control of robotic manipulators. C1 CARNEGIE MELLON UNIV,INST ROBOT,DEPT ELECT ENGN,PITTSBURGH,PA 15213. CARNEGIE MELLON UNIV,INST ROBOT,DEPT PHYS,PITTSBURGH,PA 15213. RP VOLPE, R (reprint author), JET PROP LAB,PASADENA,CA 91109, USA. NR 43 TC 7 Z9 7 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 1994 VL 9 IS 1-2 BP 121 EP 148 DI 10.1007/BF01258316 PG 28 WC Computer Science, Artificial Intelligence; Robotics SC Computer Science; Robotics GA NP720 UT WOS:A1994NP72000007 ER PT J AU COLBAUGH, R GLASS, K SERAJI, H AF COLBAUGH, R GLASS, K SERAJI, H TI DIRECT ADAPTIVE-CONTROL OF ROBOTIC SYSTEMS SO JOURNAL OF INTELLIGENT & ROBOTIC SYSTEMS LA English DT Article DE ADAPTIVE CONTROL; ROBOT CONTROL; LYAPUNOV ANALYSIS ID CONFIGURATION CONTROL; REDUNDANT ROBOTS; MANIPULATORS AB This paper presents a new approach to adaptive motion control of an important class of robotic systems. The control schemes developed using this approach are very simple and computationally efficient since they do not require knowledge of either the mathematical model or the parameter values of the robotic system dynamics. It is shown that the control strategies are globally stable in the presence of bounded disturbances, and that the size of the tracking errors can be made arbitrarily small. The proposed controllers are very general and are implementable with a wide variety of robotic systems, including both open- and closed-kinematic-chain manipulators. Computer simulation results are given for a seven degree-of-freedom (DOF) Robotics Research Corporation Model K-1607 arm. These results demonstrate that accurate and robust trajectory tracking can be achieved by using the proposed schemes. C1 JET PROP LAB,PASADENA,CA 91109. RP COLBAUGH, R (reprint author), NEW MEXICO STATE UNIV,DEPT MECH ENGN,LAS CRUCES,NM 88001, USA. NR 32 TC 0 Z9 0 U1 1 U2 3 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 1994 VL 9 IS 1-2 BP 149 EP 178 DI 10.1007/BF01258317 PG 30 WC Computer Science, Artificial Intelligence; Robotics SC Computer Science; Robotics GA NP720 UT WOS:A1994NP72000008 ER PT J AU WHITTENBERGER, JD AF WHITTENBERGER, JD TI 77-K TO 1200-K TENSILE PROPERTIES OF SEVERAL WROUGHT SUPERALLOYS AFTER LONG-TERM 1093-K HEAT-TREATMENT IN AIR AND VACUUM SO JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE LA English DT Article DE COBALT BASED ALLOYS; HEAT TREATMENT; NICKEL BASED ALLOYS; TENSILE PROPERTIES; VACUUM; SUPERALLOYS ID PURE NICKEL; EXPOSURE; LIF-22CAF2; LIOH AB The 77 to 1200 K tensile properties of approximately 1.3 mm thick wrought sheet Co-base Haynes alloy 188 and Ni-base Haynes alloy 230 and Inconel 617 have been measured after heat treatment in air and vacuum for periods up to 22,500 h at 1093 K. Significant changes in structure were produced by prior exposures, including precipitation of second phases and, in the case of heat treatment in air, oxide scale and surface-connected grain boundary pits/oxides, as deep as 50 to 70 mum, in all three superalloys. Due to the geometry of the experiment, the vacuum-exposed samples were protected from loss of volatile elements by evaporation; hence, such specimens were simply given 1093 K anneals in an innocuous environment, which produced very little surface attack. Compared to the properties of as-received alloys, prior exposure tended to reduce both the yield strength and ultimate tensile strength, with the greatest reductions at 77 and 298 K. The most dramatic effect of heat treatment was found in the low-temperature residual tensile elongation, where decreases from 40 to 5 % at 77 K were found. Ductility is the only property that was found to have a consistent dependency on environment, with air exposure always yielding less tensile elongation than vacuum exposure. RP WHITTENBERGER, JD (reprint author), NASA,LEWIS RES CTR,CLEVELAND,OH 44135, USA. NR 9 TC 7 Z9 7 U1 0 U2 1 PU ASM INTERNATIONAL PI MATERIALS PARK PA SUBSCRIPTIONS SPECIALIST CUSTOMER SERVICE, MATERIALS PARK, OH 44073-0002 SN 1059-9495 J9 J MATER ENG PERFORM JI J. Mater. Eng. Perform. PD FEB PY 1994 VL 3 IS 1 BP 91 EP 103 DI 10.1007/BF02654504 PG 13 WC Materials Science, Multidisciplinary SC Materials Science GA NQ731 UT WOS:A1994NQ73100010 ER PT J AU NOEVER, DA AF NOEVER, DA TI STATISTICS OF LOW-DENSITY MICROCELLULAR MATERIALS SO JOURNAL OF MATERIALS RESEARCH LA English DT Article ID ARRANGEMENT; MONOLAYERS; DYNAMICS; FROTH; CELLS; FOAM AB The statistics of random cellular patterns are analyzed in cross sections of low-density microcellular materials. Agreement is found with a variety of topological relations previously found for other networks, namely Lewis's law and Aboav's law. To investigate three-dimensional packing effects, experiments are performed on compressed polystyrene shot material, She resulting networks of which are subsequently analyzed in cross section. Implications for material properties and stability are discussed. RP NOEVER, DA (reprint author), UNIV SPACE RES ASSOC,NASA,MARSHALL SPACE FLIGHT CTR,ES-76,HUNTSVILLE,AL 35812, USA. NR 20 TC 1 Z9 1 U1 0 U2 3 PU MATERIALS RESEARCH SOCIETY PI PITTSBURGH PA 9800 MC KNIGHT ROAD SUITE 327, PITTSBURGH, PA 15237 SN 0884-2914 J9 J MATER RES JI J. Mater. Res. PD FEB PY 1994 VL 9 IS 2 BP 515 EP 522 DI 10.1557/JMR.1994.0515 PG 8 WC Materials Science, Multidisciplinary SC Materials Science GA MW112 UT WOS:A1994MW11200038 ER PT J AU PROSSER, WH HINKLEY, JA AF PROSSER, WH HINKLEY, JA TI INTERFACES IN THERMOPLASTIC COMPOSITES PROBED BY LASER-INDUCED ACOUSTIC-EMISSION SO JOURNAL OF MATERIALS SCIENCE LETTERS LA English DT Article ID FIBER C1 NASA,LANGLEY RES CTR,POLYMER MAT BRANCH,HAMPTON,VA 23665. RP PROSSER, WH (reprint author), NASA,LANGLEY RES CTR,NONDESTRUCT EVALUAT SCI BRANCH,HAMPTON,VA 23665, USA. NR 11 TC 1 Z9 1 U1 0 U2 2 PU CHAPMAN HALL LTD PI LONDON PA 2-6 BOUNDARY ROW, LONDON, ENGLAND SE1 8HN SN 0261-8028 J9 J MATER SCI LETT JI J. Mater. Sci. Lett. PD FEB 1 PY 1994 VL 13 IS 3 BP 213 EP 214 DI 10.1007/BF00278166 PG 2 WC Materials Science, Multidisciplinary SC Materials Science GA MW334 UT WOS:A1994MW33400022 ER PT J AU FRUM, CI OH, JJ COHEN, EA PICKETT, HM AF FRUM, CI OH, JJ COHEN, EA PICKETT, HM TI FOURIER-TRANSFORM INFRARED-EMISSION AND ROTATIONAL SPECTRA OF THE CHI(2)SIGMA+ STATES OF SRH AND SRD SO JOURNAL OF MOLECULAR SPECTROSCOPY LA English DT Article ID DIODE-LASER SPECTROSCOPY; GROUND-STATE; TRANSITION; CAH; BAH RP FRUM, CI (reprint author), JET PROP LAB,PASADENA,CA 91109, USA. NR 23 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 0022-2852 J9 J MOL SPECTROSC JI J. Mol. Spectrosc. PD FEB PY 1994 VL 163 IS 2 BP 339 EP 348 DI 10.1006/jmsp.1994.1030 PG 10 WC Physics, Atomic, Molecular & Chemical; Spectroscopy SC Physics; Spectroscopy GA MW279 UT WOS:A1994MW27900003 ER PT J AU KAO, YH HU, Y ZHENG, HX MACKENZIE, JD PERRY, K BOURHILL, G PERRY, JW AF KAO, YH HU, Y ZHENG, HX MACKENZIE, JD PERRY, K BOURHILL, G PERRY, JW TI 2ND-HARMONIC GENERATION IN TRANSPARENT BARIUM BERATE GLASS-CERAMICS SO JOURNAL OF NON-CRYSTALLINE SOLIDS LA English DT Article AB beta-BaB2O4 (BBO) has been considered to be an excellent non-linear optical material in single crystal form; however, BaO.B2O3 can also form a glass. BaO.B2O3 glass has a density of about 3.9 g/cm(3), a glass transition around 525 degrees C, an onset of crystallization around 560 degrees C, a maximum crystallization at 585 degrees C and a refractive index of 1.59. Optically transparent BaO.B2O3 glass-ceramics have been successfully prepared by controlled crystallization. Formation of submicrometer, spherical crystallites of beta-BaB2O4 within the glass was verified by X-ray diffraction and scanning electron microscopy. These glass-ceramics exhibit a UV cutoff at 220 nm, a refractive index of 1.61 and second harmonic generation efficiency 0.01-0.12 times that of urea. C1 CALTECH,JET PROP LAB,PASADENA,CA 91109. RP KAO, YH (reprint author), UNIV CALIF LOS ANGELES,DEPT MAT SCI & ENGN,LOS ANGELES,CA 90024, USA. RI Perry, Joseph/B-7191-2011 OI Perry, Joseph/0000-0003-1101-7337 NR 18 TC 73 Z9 75 U1 2 U2 7 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0022-3093 J9 J NON-CRYST SOLIDS JI J. Non-Cryst. Solids PD FEB PY 1994 VL 167 IS 3 BP 247 EP 254 DI 10.1016/0022-3093(94)90247-X PG 8 WC Materials Science, Ceramics; Materials Science, Multidisciplinary SC Materials Science GA MU683 UT WOS:A1994MU68300004 ER PT J AU FREED, AD WALKER, KP VERRILLI, MJ AF FREED, AD WALKER, KP VERRILLI, MJ TI EXTENDING THE THEORY OF CREEP TO VISCOPLASTICITY SO JOURNAL OF PRESSURE VESSEL TECHNOLOGY-TRANSACTIONS OF THE ASME LA English DT Article ID POWER-LAW CREEP; INTERNAL-STRESSES; DEFORMATION; EQUATIONS; METALS; COPPER; MODEL AB A viscoplastic theory is developed that reduces to creep theory analytically under steady-state conditions. A fairly simple model is constructed from this theoretical framework by defining material functions that have close ties to the physics of inelasticity; consequently, the model is characterized easily. The computational characteristics of the model are enhanced, in general, by converting the kinetics equation from a hyperbolic relationship to a power-law relationship. The resulting model is applied to copper and to the copper alloy, NARloy Z. C1 ENGN SCI SOFTWARE INC,SMITHFIELD,RI 02917. RP FREED, AD (reprint author), NASA,LEWIS RES CTR,DIV MAT,MS 105-1,CLEVELAND,OH 44135, USA. OI Freed, Alan/0000-0002-3492-0628 NR 44 TC 6 Z9 6 U1 0 U2 1 PU ASME-AMER SOC MECHANICAL ENG PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 SN 0094-9930 J9 J PRESS VESS-T ASME JI J. Press. Vessel Technol.-Trans. ASME PD FEB PY 1994 VL 116 IS 1 BP 67 EP 75 DI 10.1115/1.2929560 PG 9 WC Engineering, Mechanical SC Engineering GA MZ521 UT WOS:A1994MZ52100009 ER PT J AU WATSON, AB ECKERT, MP AF WATSON, AB ECKERT, MP TI MOTION-CONTRAST SENSITIVITY - VISIBILITY OF MOTION GRADIENTS OF VARIOUS SPATIAL-FREQUENCIES SO JOURNAL OF THE OPTICAL SOCIETY OF AMERICA A-OPTICS IMAGE SCIENCE AND VISION LA English DT Article ID TEMPORAL VISUAL AREA; DEPTH-PERCEPTION; RECEPTIVE-FIELD; HUMAN VISION; SELECTIVITY; DIRECTION; NEURONS; MECHANISMS; SUMMATION; PATTERNS AB The purpose of our experiments was to estimate basic sensitivity to motion gradients and to evaluate the evidence for second-order integration and differentiation of motion signals. We measured sensitivity to spatially sinusoidal contrast modulation between two oppositely moving bandpass-filtered noise images. The motion-contrast sensitivity function, defined as the inverse of threshold modulation amplitude as a function of modulation spatial frequency, was bandpass in shape with declines at both highest and lowest frequencies. The functions for three noise spatial frequencies had approximately the same shape when modulation frequency was expressed as a fraction of noise frequency. We compared the data with a model iii which linear motion filters, whose outputs are squared or rectified, are followed by a second stage of excitatory or inhibitory pooling. The data are consistent with a model in which (1) all excitatory pooling occurs at the linear stage and (2) the second stage contains a large inhibitory pooling area, with a radius approximately eight times that of the linear receptive field. RP WATSON, AB (reprint author), NASA,AMES RES CTR,MOFFETT FIELD,CA 94035, USA. NR 36 TC 42 Z9 42 U1 0 U2 1 PU OPTICAL SOC AMER PI WASHINGTON PA 2010 MASSACHUSETTS AVE NW, WASHINGTON, DC 20036 SN 0740-3232 J9 J OPT SOC AM A JI J. Opt. Soc. Am. A-Opt. Image Sci. Vis. PD FEB PY 1994 VL 11 IS 2 BP 496 EP 505 DI 10.1364/JOSAA.11.000496 PG 10 WC Optics SC Optics GA MV331 UT WOS:A1994MV33100004 ER PT J AU BENEDICT, R BRECKINRIDGE, JB FRIED, DL AF BENEDICT, R BRECKINRIDGE, JB FRIED, DL TI ATMOSPHERIC-COMPENSATION TECHNOLOGY - INTRODUCTION SO JOURNAL OF THE OPTICAL SOCIETY OF AMERICA A-OPTICS IMAGE SCIENCE AND VISION LA English DT Editorial Material C1 CALTECH,JET PROP LAB,PASADENA,CA 91109. OPT SCI CO,ANAHEIM,CA 92825. RP BENEDICT, R (reprint author), WJ SCHAFER ASSOCIATES INC,ALBUQUERQUE,NM 87106, USA. NR 0 TC 0 Z9 0 U1 1 U2 1 PU OPTICAL SOC AMER PI WASHINGTON PA 2010 MASSACHUSETTS AVE NW, WASHINGTON, DC 20036 SN 0740-3232 J9 J OPT SOC AM A JI J. Opt. Soc. Am. A-Opt. Image Sci. Vis. PD FEB PY 1994 VL 11 IS 2 BP 780 EP 780 PG 1 WC Optics SC Optics GA MV331 UT WOS:A1994MV33100038 ER PT J AU HERLEY, PJ WANG, CS VARSI, G LEVY, PW AF HERLEY, PJ WANG, CS VARSI, G LEVY, PW TI THE EFFECTS OF FAST-NEUTRON, GAMMA-RAY AND COMBINED RADIATIONS ON THE THERMAL-DECOMPOSITION OF AMMONIUM-PERCHLORATE POWDER ALUMINUM PARTICLE MIXTURES SO JOURNAL OF THERMAL ANALYSIS LA English DT Article DE AMMONIUM PERCHLORATE; KINETICS; RADIATION EFFECTS AB The thermal decomposition kinetics of irradiated and unirradiated ammonium perchlorate and ammonium perchlorate powder - aluminum particle mixtures has been studied by determining decomposition gas pressure vs. heating time with samples at a controlled temperature. Qualitatively the radiation induced changes are similar to those obtained in previous studies on 'pure' ammonium perchlorate. The induction period is shortened and the acceleratory and decay period rate constants are increased. The data have been analyzed using Avrami-Erofeev kinetics. The results for pure unirradiated material are in accord with published results. The activation energies for the induction, acceleratory and decay periods for pure pellets were found to be 133.5+/-6.7, 131.8+/-6.7 and 127.2+/-6.7 kJ.mol, respectively. Samples were exposed to either a single gamma-ray irradiation, fission neutron irradiation followed by a gamma-ray irradiation, or to a proton irradiation. When compared on an equal energy deposited basis, the fast neutron induced changes are appreciably larger than the gamma-ray changes. However, the proton induced changes are comparable or slightly more than the gamma-ray effects. Some, or all, of the fast neutron effects can be attributable to the concentrated radiation damage 'spikes' along the path of lattice atom recoils. It is likely that these become thermal decomposition sites when the crystals are heated. Protons create fewer spikes than fast neutrons. Overall, the results indicate that any ammonium perchlorate - aluminum propellant mixtures that may be exposed to radiation environments, such as used in this study, should be subjected to a thorough radiation effects analysis if reliable performance is required. C1 SUNY STONY BROOK,STONY BROOK,NY 11794. JET PROPULS LAB,PASADENA,CA 91103. BROOKHAVEN NATL LAB,UPTON,NY 11973. NR 16 TC 1 Z9 1 U1 1 U2 2 PU JOHN WILEY & SONS LTD PI W SUSSEX PA BAFFINS LANE CHICHESTER, W SUSSEX, ENGLAND PO19 1UD SN 0368-4466 J9 J THERM ANAL JI J. Therm. Anal. PD FEB-MAR PY 1994 VL 41 IS 2-3 BP 435 EP 448 DI 10.1007/BF02549325 PG 14 WC Thermodynamics; Chemistry, Analytical; Chemistry, Physical SC Thermodynamics; Chemistry GA NG203 UT WOS:A1994NG20300012 ER PT J AU LANDIS, GA AF LANDIS, GA TI LASERS, SOLAR-CELLS, AND SPACE SO LASER FOCUS WORLD LA English DT Letter RP LANDIS, GA (reprint author), NASA,LEWIS RES CTR,PHOTOVOLTA BRANCH,CLEVELAND,OH 44135, USA. NR 1 TC 0 Z9 0 U1 0 U2 0 PU PENNWELL PUBL CO PI NASHUA PA 5TH FLOOR TEN TARA BOULEVARD, NASHUA, NH 03062-2801 SN 0740-2511 J9 LASER FOCUS WORLD JI Laser Focus World PD FEB PY 1994 VL 30 IS 2 BP 57 EP 57 PG 1 WC Optics SC Optics GA MX071 UT WOS:A1994MX07100020 ER PT J AU MORIK, K BERGADANO, F BUNTINE, W AF MORIK, K BERGADANO, F BUNTINE, W TI SPECIAL ISSUE ON EVALUATING AND CHANGING REPRESENTATION - GUEST EDITORIAL SO MACHINE LEARNING LA English DT Editorial Material C1 NASA,AMES RES CTR,MOFFETT FIELD,CA 94035. UNIV TURIN,I-10124 TURIN,ITALY. RP MORIK, K (reprint author), UNIV DORTMUND,W-4600 DORTMUND 50,GERMANY. NR 7 TC 0 Z9 0 U1 0 U2 0 PU KLUWER ACADEMIC PUBL PI DORDRECHT PA SPUIBOULEVARD 50, PO BOX 17, 3300 AA DORDRECHT, NETHERLANDS SN 0885-6125 J9 MACH LEARN JI Mach. Learn. PD FEB PY 1994 VL 14 IS 2 BP 137 EP 138 DI 10.1023/A:1022670015471 PG 2 WC Computer Science, Artificial Intelligence SC Computer Science GA MZ173 UT WOS:A1994MZ17300001 ER PT J AU CHATTOPADHYAY, A MCCARTHY, TR MADDEN, JF AF CHATTOPADHYAY, A MCCARTHY, TR MADDEN, JF TI AN OPTIMIZATION PROCEDURE FOR THE DESIGN OF PROP-ROTORS IN HIGH-SPEED CRUISE INCLUDING THE COUPLING OF PERFORMANCE, AEROELASTIC STABILITY, AND STRUCTURES SO MATHEMATICAL AND COMPUTER MODELLING LA English DT Article ID CONSTRAINTS AB An optimization procedure is developed to address the complex problem of designing prop-rotors in high speed cruise. The objectives are maximization of the aerodynamic efficiency in high speed cruise and minimization of the total rotor weight. Constraints are imposed on aeroelastic stability in cruise and rotor thrust. An isotropic box beam is used to model the principal load carrying member in the blade. Design variables include blade sweep and twist distributions, rotational velocity in cruise, and the box beam wall thickness. Since the optimization problem is associated with multiple design objectives, the problem is formulated using a multiobjective formulation technique known as the Kreisselmeier-Steinhauser function approach. The optimization algorithm is based on the method of feasible directions. A hybrid approximate analysis technique is used to reduce the computational expense of using exact analyses for every function evaluation within the optimizer. The results are compared to two reference rotors, unswept and swept. The optimum results shows significant improvements in the propulsive efficiency in cruise and reductions in the rotor weight without loss of aeroelastic stability or thrust, when compared to the reference unswept rotor. The swept reference rotor is initially unstable and the optimization procedure has been successful in producing a blade design which is fully stable with significant improvements in efficiency and blade weight. Off-design studies performed indicate that the optimum rotor maintains high propulsive efficiency over a wide range of operating conditions. C1 NASA,AMES RES CTR,ROTORCRAFT TECHNOL BRANCH,MOFFETT FIELD,CA 94035. RP CHATTOPADHYAY, A (reprint author), ARIZONA STATE UNIV,DEPT MECH & AEROSP ENGN,TEMPE,AZ 85287, USA. NR 24 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 0895-7177 J9 MATH COMPUT MODEL JI Math. Comput. Model. PD FEB PY 1994 VL 19 IS 3-4 BP 75 EP 88 DI 10.1016/0895-7177(94)90058-2 PG 14 WC Computer Science, Interdisciplinary Applications; Computer Science, Software Engineering; Mathematics, Applied SC Computer Science; Mathematics GA ND011 UT WOS:A1994ND01100006 ER PT J AU COYLE, DB KAY, RB DEGNAN, JJ KREBS, DJ AF COYLE, DB KAY, RB DEGNAN, JJ KREBS, DJ TI INJECTION-SEEDED DIODE-PUMPED REGENERATIVE RING ND-YAG AMPLIFIER FOR SPACEBORNE LASER RANGING SO MEASUREMENT SCIENCE AND TECHNOLOGY LA English DT Article AB We report on a small, all solid state, regenerative ring amplifier designed as a prototype for space application. Features include dual side pumping of a 2 mm x 2 mm x 10 mm Nd: YAG slab and a triangular ring cavity design, which minimizes the number of optical components. The pump head was fitted with twin single-bar diode arrays consisting of 960 individual stripes, temperature tuned to the Nd: YAG pump bands at 809 nm and capable of operation up to 100 Hz. The single-pass gain of this head was measured at 13% for a pump pulse energy of 18.4 mJ from the diode arrays and the cavity round trip transit time was 3.1 ns. The ring has amplified 170 ps pulses with 10(-13)-10(-14) j of energy by a factor of more than about 10(6) while preserving both the temporal and spatial shape of the pulses. The seeding threshold was about 10(-15) J and a maximum saturated output energy of about 40 muJ was obtained when seeded with pulses greater than 1 pJ. Comparison with modelled performance is also given. C1 NASA, GODDARD SPACE FLIGHT CTR, PHOTON BRANCH, GREENBELT, MD 20771 USA. NASA, GODDARD SPACE FLIGHT CTR, SPACE GEODESY & ALTIMETRY PROJECTS OFF, GREENBELT, MD 20771 USA. RP AMERICAN UNIV, DEPT PHYS, 4400 MASSACHUSETTS AVE NW, WASHINGTON, DC 20016 USA. NR 11 TC 4 Z9 4 U1 1 U2 2 PU IOP PUBLISHING LTD PI BRISTOL PA TEMPLE CIRCUS, TEMPLE WAY, BRISTOL BS1 6BE, ENGLAND SN 0957-0233 EI 1361-6501 J9 MEAS SCI TECHNOL JI Meas. Sci. Technol. PD FEB PY 1994 VL 5 IS 2 BP 136 EP 143 DI 10.1088/0957-0233/5/2/009 PG 8 WC Engineering, Multidisciplinary; Instruments & Instrumentation SC Engineering; Instruments & Instrumentation GA MX912 UT WOS:A1994MX91200009 ER PT J AU LERCH, BA NOEBE, RD AF LERCH, BA NOEBE, RD TI LOW-CYCLE FATIGUE BEHAVIOR OF POLYCRYSTALLINE NIAL AT 1000-K SO METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE LA English DT Article ID PLASTIC-FLOW PROPERTIES; GRAIN-SIZE; THERMOMECHANICAL FATIGUE; DEFORMATION MECHANISMS; TEMPERATURE-DEPENDENCE; TENSILE PROPERTIES; DUCTILITY; FRACTURE; BRITTLE AB The low-cycle fatigue behavior of polycrystalline NiAl wag determined at 1000 K; a temperature above the monotonic brittle-to-ductile transition temperature (BDTT). Fully reversed, plastic strain-controlled fatigue tests were conducted on B2 intermetallic samples prepared by two fabrication techniques: hot isostatic pressing (HIP) of prealloyed powders and extrusion of vacuum induction-melted [cast plus extruded (C+E)] castings. At 1000 K, in an air environment both the hot-isostatically pressed (''hipped'') and C+E samples cyclically softened throughout most of their fatigue lives, though the absolute change in stress was no greater than about 35 MPa. At this temperature, samples were insensitive to processing defects, which were a source of failure initiation in room-temperature tests. The processing method had a small effect on fatigue life; the lives of the hipped samples were about a factor of 3 shorter than the fatigue lives of the C+E NiAl. The C+E material also underwent dynamic grain growth during testing, while the hipped NiAl maintained a constant grain size. Stable fatigue-crack growth in both materials was intergranular in nature, while final fracture by tensile overload occurred by transgranular cleavage. However, at plastic strain ranges below 0.3 pct, the fatigue lives of the hipped NiAl were controlled by intergranular cavitation and creep processes such that the fatigue lives were shorter than anticipated. Finally, hipped samples tested in vacuum had a factor of 3 longer life than specimens tested in air. A comparison of NiAl to typical superalloys (which it may replace) showed that NiAl exhibited a superior fatigue life on a plastic strain basis but was inferior to most superalloys on a stress basis. RP LERCH, BA (reprint author), NASA,LEWIS RES CTR,CLEVELAND,OH 44135, USA. NR 40 TC 4 Z9 4 U1 0 U2 0 PU MINERALS METALS MATERIALS SOC PI WARRENDALE PA 420 COMMONWEALTH DR, WARRENDALE, PA 15086 SN 1073-5623 J9 METALL MATER TRANS A JI Metall. Mater. Trans. A-Phys. Metall. Mater. Sci. PD FEB PY 1994 VL 25 IS 2 BP 309 EP 319 DI 10.1007/BF02647976 PG 11 WC Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Materials Science; Metallurgy & Metallurgical Engineering GA NE734 UT WOS:A1994NE73400008 ER PT J AU MANOBIANCO, J KOCH, S KARYAMPUDI, VM NEGRI, AJ AF MANOBIANCO, J KOCH, S KARYAMPUDI, VM NEGRI, AJ TI THE IMPACT OF ASSIMILATING SATELLITE-DERIVED PRECIPITATION RATES ON NUMERICAL SIMULATIONS OF THE ERICA IOP-4 CYCLONE SO MONTHLY WEATHER REVIEW LA English DT Article ID EAST COAST CYCLOGENESIS; WEATHER PREDICTION; DIABATIC INITIALIZATION; CUMULUS CONVECTION; LATENT-HEAT; PHYSICAL INITIALIZATION; SPECTRAL MODEL; RAINFALL; SENSITIVITY; RESOLUTION AB The present study uses a regional-scale numerical model to test the impact of dynamically assimilating satellite-derived precipitation rates on the numerical simulations of one of the deepest extratropical cyclones to develop south of 40-degrees-N in this century. This cyclone event occurred during the Experiment on Rapidly Intensifying Cyclones over the Atlantic (ERICA) intensive observing period 4 and has been selected because of the strength of the cyclone and the availability of the special ERICA data in addition to the Special Sensor Microwave/Imager (SSM/I) and Geostationary Operational Environmental Satellite (GOES) infrared (IR) satellite data. The unique methodology developed herein to synthesize the SSM/1 and GOES IR satellite data produces precipitation estimates that have realistic spatial and temporal structure. The assimilation of satellite-derived precipitation is accomplished by scaling the internally generated model profiles of total latent heating. At points where the model is not producing precipitation, the vertical distribution of total latent heating given by satellite precipitation is specified from instantaneous model-based profiles at adjacent points using a search algorithm. The technique does not assume a priori that the satellite-estimated precipitation corresponds to either convective or stratiform model precipitation, and uses heating profiles that am consistent with the model's parameterization of either type of precipitation since they are not specified from externally based parabolic or other structure functions. Several simulations are performed with and without satellite data assimilation at varying horizontal and vertical model resolutions. The results from the 80-km 40-layer control and assimilation runs demonstrate that the assimilation of satellite precipitation 1) does not introduce noise into the simulations at any time during or after the data assimilation period, 2) forces the model to reproduce the magnitude and distribution of satellite precipitation, and 3) improves the simulated central mean sea level pressure (MSLP) minima slightly, frontal positions, and, to a greater extent, the low-level vertical-motion patterns when compared with subjective analyses and satellite imagery. The model retains the information introduced by the assimilation of satellite-derived precipitation 8.5 h after the end of the data assimilation period. An increase in the vertical and horizontal model resolution further reduces the errors in simulating the MSLP minima but does not consistently improve the cyclone position errors in the assimilation runs. Either the exclusion of the search algorithm, the doubling of satellite precipitation, or an eastward shift of satellite precipitation by 400 km increases the MSLP and position errors; therefore, the impact of assimilating satellite precipitation depends on model resolution, the use of the search algorithm, and the magnitude and position of satellite precipitation. The increase in horizontal resolution generates the largest reduction in MSLP errors, while the shifting of satellite precipitation generates the largest increase in MSLP errors. The results confirm the findings of earlier studies that the impact of assimilating satellite precipitation on the subsequent simulations is less sensitive to errors in magnitude rather than to the distribution of satellite-derived precipitation and depends on the relative accuracy with which the model simulates the cyclone in the control run. Despite the fact that this study focuses on a single case, it does demonstrate the promise of using combined infrared and microwave satellite precipitation estimates to produce sustained positive impacts in mesoscale model forecasts of midlatitude cyclogenesis over data-sparse oceanic regions. C1 NASA,GODDARD SPACE FLIGHT CTR,RES & DATA SYST,GREENBELT,MD 20771. NASA,GODDARD SPACE FLIGHT CTR,ATMOSPHERES LAB,GREENBELT,MD 20771. UNIV SPACE RES ASSOCIAT,COLUMBIA,MD. NR 48 TC 61 Z9 65 U1 2 U2 2 PU AMER METEOROLOGICAL SOC PI BOSTON PA 45 BEACON ST, BOSTON, MA 02108-3693 SN 0027-0644 J9 MON WEATHER REV JI Mon. Weather Rev. PD FEB PY 1994 VL 122 IS 2 BP 341 EP 365 DI 10.1175/1520-0493(1994)122<0341:TIOASD>2.0.CO;2 PG 25 WC Meteorology & Atmospheric Sciences SC Meteorology & Atmospheric Sciences GA MW544 UT WOS:A1994MW54400007 ER PT J AU FOXRABINOVITZ, MS AF FOXRABINOVITZ, MS TI COMPUTATIONAL DISPERSION PROPERTIES OF VERTICALLY STAGGERED GRIDS FOR ATMOSPHERIC MODELS SO MONTHLY WEATHER REVIEW LA English DT Article ID SHALLOW-WATER EQUATIONS; FINITE-ELEMENT; SCHEMES AB The computational dispersion properties of vertically and time-vertically staggered grids, using corresponding centered-difference schemes for approximation of a linear baroclinic primitive equation system, are analyzed in terms of frequency and group velocity characteristics. The vertical scale ranges with group velocities of the wrong sign are pointed out. It is shown that among all possible vertical grids applicable to primitive equation atmospheric models the best vertical grids have computational dispersion properties corresponding to a regular (equidistant, unstaggered) grid with twice the vertical resolution. These best vertical grids are 1) two well-known vertically staggered grids, namely, the widely used Lorenz grid and the Charney-Phillips grid; 2) two other vertically staggered grids carrying both horizontal and vertical velocity components at the same levels; and 3) the new time-staggered versions of all the aforementioned grids, and the time-staggered regular vertical grid, if used with either the appropriate version of an economical explicit scheme or a semi-implicit scheme for approximations with these time-staggered grids. All these best vertical grids are computationally efficient due to their enhanced effective vertical resolution. Moreover, the time-vertically staggered grids considered here provide twice the effective vertical resolution of comparable vertically staggered grids for finite-difference approximations of the vertical derivatives in vertical advection and vertical diffusion terms. In other words, these time-vertically staggered grids provide uniformly twice the effective vertical resolution for the whole baroclinic model system. The application of higher- (fourth) order vertical-difference approximation results in some moderate improvement of vertical grid dispersion properties, primarily for the small vertical and large horizontal scale range, but it is definitely less significant than the effect of doubling the effective vertical resolution by staggering. Computational dispersion properties of vertical grids, along with other computational characteristics and requirements, may provide guidance for an optimal choice of an appropriate vertical grid for a primitive equation atmospheric model. RP FOXRABINOVITZ, MS (reprint author), NASA,GODDARD SPACE FLIGHT CTR,ATMOSPHERES LAB,CODE 9103,GREENBELT,MD 20771, USA. NR 28 TC 6 Z9 6 U1 2 U2 2 PU AMER METEOROLOGICAL SOC PI BOSTON PA 45 BEACON ST, BOSTON, MA 02108-3693 SN 0027-0644 J9 MON WEATHER REV JI Mon. Weather Rev. PD FEB PY 1994 VL 122 IS 2 BP 377 EP 392 DI 10.1175/1520-0493(1994)122<0377:CDPOVS>2.0.CO;2 PG 16 WC Meteorology & Atmospheric Sciences SC Meteorology & Atmospheric Sciences GA MW544 UT WOS:A1994MW54400009 ER PT J AU ASAKO, Y FAGHRI, M CHARMCHI, M BAHRAMI, PA AF ASAKO, Y FAGHRI, M CHARMCHI, M BAHRAMI, PA TI NUMERICAL-SOLUTION FOR MELTING OF UNFIXED RECTANGULAR PHASE-CHANGE MATERIAL UNDER LOW-GRAVITY ENVIRONMENT SO NUMERICAL HEAT TRANSFER PART A-APPLICATIONS LA English DT Article ID HEAT-TRANSFER; ICE; CAPSULE AB An enthalpy method is employed to solve transport processes associated with melting of an unfixed rectangular phase change material (PCM) in a low-gravitational environment. This method permits the phase-change problems to be solved within fixed numerical grids, hence eliminating the need for coordinate transformation. The PCM, initially at its melting temperature, is placed inside a rectangular enclosure. The lower surface of the container is then exposed to a uniform temperature higher than the PCM melting temperature. The difference in densities of solid and liquid causes a force imbalance on the solid in the gravitational and low-gravity environments. In the case where the density of the solid phase exceeds that of the liquid, the solid continually moves downward as melting progresses and hence generates a flow field within the liquid. The problem is formulated as a one-domain problem with the possibility of melting from all the PCM surfaces, and no approximation is made about the liquid film thickness under the melt. The governing equations are discretized by using a control-volume-based finite difference scheme with a new iterative method to correct for the downward solid-phase velocity. This will also speed up the convergence of the numerical procedure. The results are presented in the form of a parametric study of the effects of Archimedes number, Stefan number, Prandtl number, and the geometric parameters on the melt thickness, the downward solid velocity, the elevation of the top surface, and the volume of the solid PCM. They show that in a low-gravitational environment, the melting rate is very slow. C1 UNIV RHODE ISL,DEPT MECH ENGN,KINGSTON,RI 02881. NASA,AMES RES CTR,MOFFETT FIELD,CA 94035. TOKYO METROPOLITAN UNIV,DEPT MECH ENGN,TOKYO 158,JAPAN. UNIV MASSACHUSETTS,DEPT MECH ENGN,LOWELL,MA. NR 14 TC 19 Z9 19 U1 0 U2 4 PU HEMISPHERE PUBL CORP PI BRISTOL PA 1900 FROST ROAD, SUITE 101, BRISTOL, PA 19007-1598 SN 1040-7782 J9 NUMER HEAT TR A-APPL JI Numer. Heat Tranf. A-Appl. PD FEB PY 1994 VL 25 IS 2 BP 191 EP 208 DI 10.1080/10407789408955944 PG 18 WC Thermodynamics; Mechanics SC Thermodynamics; Mechanics GA MY350 UT WOS:A1994MY35000005 ER PT J AU JOHNSON, CL HERRMANN, M AF JOHNSON, CL HERRMANN, M TI INNER MAGNETOSPHERE IMAGER MISSION - A NEW WINDOW ON THE PLASMA UNIVERSE SO OPTICAL ENGINEERING LA English DT Article DE MAGNETOSPHERIC IMAGERY; AURORAS; GEOCORONA; NEUTRAL ATOM IMAGING; X-RAY IMAGING AB The proposed Inner Magnetosphere Imager mission will obtain the first simultaneous images of the component regions of the inner magnetosphere and will enable scientists to relate these global images to internal and external influences, as well as local observations. We are performing at the George C. Marshall Space Flight Center a concept definition study of the proposed mission. The baseline mission calls for an instrument complement of approximately seven imagers to fly in an elliptical Earth orbit with an apogee of seven Earth radii (R(e)) and a perigee of approximately 4800 km. Several spacecraft concepts are being considered for the mission. The first concept utilizes a spinning spacecraft with a despun platform. The second concept splits the instruments onto two smaller satellites-a spinning spacecraft and a complementary three-axis stabilized spacecraft. Launch options being assessed for the spacecraft range from a Delta II, for the single- and dual-spacecraft concepts, to dual Taurus launches, for the two smaller spacecraft. An additional option, that of downsizing the mission to fit within the guidelines of the Space Physics Division's new class of solar terrestrial probes, is also being considered. RP JOHNSON, CL (reprint author), NASA,MARSHALL SPACE FLIGHT CTR,MAIL CODE PS02,HUNTSVILLE,AL 35812, USA. NR 5 TC 1 Z9 1 U1 0 U2 0 PU SOC PHOTO-OPT INSTRUM ENG PI BELLINGHAM PA PO BOX 10, BELLINGHAM, WA 98227-0010 SN 0091-3286 J9 OPT ENG JI Opt. Eng. PD FEB PY 1994 VL 33 IS 2 BP 329 EP 334 DI 10.1117/12.157722 PG 6 WC Optics SC Optics GA MW892 UT WOS:A1994MW89200002 ER PT J AU GHIELMETTI, AG SHELLEY, EG FUSELIER, SA WURZ, P BOCHSLER, P HERRERO, FA SMITH, MF STEPHEN, TS AF GHIELMETTI, AG SHELLEY, EG FUSELIER, SA WURZ, P BOCHSLER, P HERRERO, FA SMITH, MF STEPHEN, TS TI MASS SPECTROGRAPH FOR IMAGING LOW-ENERGY NEUTRAL ATOMS SO OPTICAL ENGINEERING LA English DT Article DE MAGNETOSPHERIC IMAGERY; ATMOSPHERIC REMOTE SENSING; NEUTRAL ATOM IMAGING; ION OPTICS; TIME-OF-FLIGHT SPECTROMETRY; SURFACE CONVERSION ID SURFACE COLLISIONS; CHARGE-EXCHANGE AB We describe an instrument concept for measuring low-energy neutral H and O atoms with kinetic energies ranging from about 10 eV to several hundred. The instrument makes use of a low work function surface to convert neutral atoms to negative ions. These ions are then accelerated away from the surface and brought to an intermediate focus by a large aperture lens. After deflection in a spherical electrostatic analyzer, the ions are postaccelerated to similar to 25-keV final energy into a carbon-foil time-of-flight mass analyzer. Mass resolution is adequate to resolve H, D, He, and O. Energy and azimuth angle information is obtained by means of position imaging the secondary electrons produced at the carbon foil. A large geometric factor combined with simultaneous angle-energy-mass imaging that eliminates the need for duty cycles provide the necessary high sensitivity. From a spinning spacecraft this instrument is capable of producing a 2-D map of low-energy neutral atom fluxes. C1 UNIV BERN,INST PHYS,CH-3012 BERN,SWITZERLAND. NASA,GODDARD SPACE FLIGHT CTR,EXTRATERR PHYS LAB,GREENBELT,MD 20771. UNIV DENVER,DEPT PHYS,DENVER,CO 80208. RP GHIELMETTI, AG (reprint author), LOCKHEED PALO ALTO RES LABS,3251 HANOVER ST,D-91-20,B255,PALO ALTO,CA 94304, USA. NR 28 TC 24 Z9 24 U1 0 U2 1 PU SOC PHOTO-OPT INSTRUM ENG PI BELLINGHAM PA PO BOX 10, BELLINGHAM, WA 98227-0010 SN 0091-3286 J9 OPT ENG JI Opt. Eng. PD FEB PY 1994 VL 33 IS 2 BP 362 EP 370 DI 10.1117/12.155910 PG 9 WC Optics SC Optics GA MW892 UT WOS:A1994MW89200007 ER PT J AU CHAKRABARTI, S EDELSTEIN, J KESKIKUHA, RAM THREAT, FT AF CHAKRABARTI, S EDELSTEIN, J KESKIKUHA, RAM THREAT, FT TI REFLECTIVE COATING OF 834 ANGSTROM FOR IMAGING O+ IONS SO OPTICAL ENGINEERING LA English DT Article; Proceedings Paper CT SPIE Conference on Instrumentation for Magnetospheric Imagery CY JUL 21-22, 1992 CL SAN DIEGO, CA SP SOC PHOTO OPT INSTRUMENTAT ENGINEERS DE MAGNETOSPHERIC IMAGERY; ATMOSPHERIC REMOTE SENSING; MULTILAYER COATINGS; REFLECTION FILTERS ID EXTREME ULTRAVIOLET; AIRGLOW AB Imaging upflowing O+ ions of ionospheric origin and plasmaspheric O+ can be achieved through solar resonance scattering at 834 Angstrom. Unfortunately, several strong background emissions, including the ones at 1025 and 1216 Angstrom due to geocoronal hydrogen atoms, pose serious problems. Most common optical coatings have higher reflectivity at 1025 and 1216 Angstrom than at 834 Angstrom. After examining a number of options, we have designed a multiple-layer coating that selectively reflects 834-Angstrom radiation and suppresses 1025- and 1216-Angstrom radiation The structure oi the coating material consists of a very thin (50 to 150 Angstrom) metal (nickel) layer on top of a semitransparent dielectric material (magnesium fluoride) over an aluminum substrate. Three such coatings were produced at NASA Goddard Space Flight Center using an existing coating facility that is not optimized for thin coatings. in spite of such fabrication difficulties, we have obtained encouraging results. C1 UNIV CALIF BERKELEY,SPACE SCI LAB,BERKELEY,CA 94720. NASA,GODDARD SPACE FLIGHT CTR,GREENBELT,MD 20771. RP CHAKRABARTI, S (reprint author), BOSTON UNIV,CTR SPACE PHYS,725 COMMONWEALTH AVE,BOSTON,MA 02215, USA. NR 17 TC 9 Z9 9 U1 0 U2 0 PU SOC PHOTO-OPT INSTRUM ENG PI BELLINGHAM PA PO BOX 10, BELLINGHAM, WA 98227-0010 SN 0091-3286 J9 OPT ENG JI Opt. Eng. PD FEB PY 1994 VL 33 IS 2 BP 409 EP 413 DI 10.1117/12.155927 PG 5 WC Optics SC Optics GA MW892 UT WOS:A1994MW89200011 ER PT J AU EGALON, CO ROGOWSKI, RS AF EGALON, CO ROGOWSKI, RS TI AXIAL STRAIN INSENSITIVITY OF WEAKLY GUIDING OPTICAL FIBERS SO OPTICAL ENGINEERING LA English DT Article DE CIRCULAR OPTICAL FIBERS (WEAKLY GUIDING); ELECTROMAGNETIC THEORY; OPTICAL FIBER DISTRIBUTED SENSORS; OPTICAL FIBER STRAIN SENSORS; STEP INDEX PROFILE FIBERS; MODAL PHASE SHIFT AB A numerical model was developed to calculate the modal phase shift of a circular step index profile weakly guiding optical fiber under axial strain. Whenever an optical fiber is under stress, the optical path length, the index of retraction, and the propagation constants of each mode change. In consequence, the phase of each mode is also modified. A relationship for the modal phase shift is presented. This relation is applied to both single-mode and two-mode fibers to determine the sensitivity characteristics of strained fibers. It was found that the phase shift is strongly dependent on the core refractive index n(co). It was also found that it is possible to design fibers that are insensitive to axial strain. Practical applications of strain-insensitive fibers are discussed. RP EGALON, CO (reprint author), NASA,LANGLEY RES CTR,NONDESTRUCT EVALUAT SCI BRANCH,MS 231,HAMPTON,VA 23681, USA. NR 7 TC 0 Z9 0 U1 0 U2 1 PU SOC PHOTO-OPT INSTRUM ENG PI BELLINGHAM PA PO BOX 10, BELLINGHAM, WA 98227-0010 SN 0091-3286 J9 OPT ENG JI Opt. Eng. PD FEB PY 1994 VL 33 IS 2 BP 498 EP 501 DI 10.1117/12.152201 PG 4 WC Optics SC Optics GA MW892 UT WOS:A1994MW89200024 ER PT J AU CANTRELL, JH YOST, WT AF CANTRELL, JH YOST, WT TI ACOUSTIC HARMONIC-GENERATION FROM FATIGUE-INDUCED DISLOCATION DIPOLES SO PHILOSOPHICAL MAGAZINE A-PHYSICS OF CONDENSED MATTER STRUCTURE DEFECTS AND MECHANICAL PROPERTIES LA English DT Article ID COPPER AB A model is presented of the interaction of an acoustic wave with dislocation dipoles and dipole-array approximations to veins and persistent slip bands (substructures) formed during metal fatigue. The model predicts the generation of a substantial acoustic second harmonic that depends on the distance between the glide planes of the dipole pair, on the dipole density, and on the particular arrangement and volume fraction of dipoles in a given substructure of the fatigued solid. Experimental evidence which strongly supports the essential features of the model is presented for fatigued aluminium alloy 2024-T4. C1 NASA,LANGLEY RES CTR,HAMPTON,VA 23681. RP CANTRELL, JH (reprint author), UNIV CAMBRIDGE,CAVENDISH LAB,MADINGLEY RD,CAMBRIDGE CB3 0HE,ENGLAND. NR 22 TC 106 Z9 114 U1 2 U2 16 PU TAYLOR & FRANCIS LTD PI LONDON PA ONE GUNDPOWDER SQUARE, LONDON, ENGLAND EC4A 3DE SN 0141-8610 J9 PHILOS MAG A JI Philos. Mag. A-Phys. Condens. Matter Struct. Defect Mech. Prop. PD FEB PY 1994 VL 69 IS 2 BP 315 EP 326 PG 12 WC Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering; Physics, Applied; Physics, Condensed Matter SC Materials Science; Metallurgy & Metallurgical Engineering; Physics GA MV941 UT WOS:A1994MV94100006 ER PT J AU MILLER, RL DECAMPO, J AF MILLER, RL DECAMPO, J TI C-COAST - A PC-BASED PROGRAM FOR THE ANALYSIS OF COASTAL PROCESSES USING NOAA COASTWATCH DATA SO PHOTOGRAMMETRIC ENGINEERING AND REMOTE SENSING LA English DT Article C1 NOAA,NATL MARINE FISHERIES SERV,SE FISHERIES SCI CTR,BEAUFORT LAB,BEAUFORT,NC 28516. RP MILLER, RL (reprint author), NASA,EARTH OBSERV PROJECTS OFF,JA20 BLDG 1000,STENNIS SPACE CTR,BAY ST LOUIS,MS 39519, USA. NR 2 TC 2 Z9 2 U1 0 U2 0 PU AMER SOC PHOTOGRAMMETRY PI BETHESDA PA 5410 GROSVENOR LANE SUITE 210, BETHESDA, MD 20814-2160 SN 0099-1112 J9 PHOTOGRAMM ENG REM S JI Photogramm. Eng. Remote Sens. PD FEB PY 1994 VL 60 IS 2 BP 155 EP 159 PG 5 WC Geography, Physical; Geosciences, Multidisciplinary; Remote Sensing; Imaging Science & Photographic Technology SC Physical Geography; Geology; Remote Sensing; Imaging Science & Photographic Technology GA MW653 UT WOS:A1994MW65300001 ER PT J AU STAHLE, CK KELLEY, RL MOSELEY, SH SZYMKOWIAK, AE JUDA, M MCCAMMON, D ZHANG, J AF STAHLE, CK KELLEY, RL MOSELEY, SH SZYMKOWIAK, AE JUDA, M MCCAMMON, D ZHANG, J TI DELAYED THERMALIZATION OF X-RAYS ABSORBED IN TIN FILMS FAR BELOW THE SUPERCONDUCTING TRANSITION-TEMPERATURE SO PHYSICA B LA English DT Article; Proceedings Paper CT 20th International Conference on Low Temperature Physics CY AUG 04-11, 1993 CL EUGENE, OR SP INT UNION PURE & APPL PHYS, AMER PHYS SOC, CITY EUGENE, INT INST REFRIGERAT, INT SCI FDN, JET PROPULS LABS, NATL SCI FDN, USN, OFF NAVAL RES, OXFORD INSTRUMENTS INC, TEKTRONIX INC, UNIV OREGON AB As part of a program for developing high resolution X-ray detectors, we have deposited 4 mum thick Sn films on silicon calorimeters to serve as X ray absorbers. Thermistors in the silicon measured the temperature increase resulting from the thermalization of an X-ray photon. Silver-filled epoxy was placed on the Sn to establish a complete thermalization reference. The devices were operated near 0.1 K and below. Signal pulses resulting from the absorption of 6 keV photons in the Ag epoxy rose faster, peaked higher, and decayed to baseline more quickly than those resulting from absorption in the Sn. Taking the Ag pulse shape to be the impulse response of the detector, we deconvolved it from the average Sn pulse shape to obtain the thermalization function in the Sn. The result contained a slow component with a thermalization rate on the scale of several milliseconds. We consider this an indication of the quasiparticle recombination time in the Sn during the non-equilibrium condition following X-ray absorption. We were able to manipulate the thermalization by heating the device above the Sn transition temperature and varying the amount of magnetic field present upon cooling. C1 UNIV WISCONSIN,DEPT PHYS,MADISON,WI 53706. RP STAHLE, CK (reprint author), NASA,GODDARD SPACE FLIGHT CTR,GREENBELT,MD 20771, USA. RI Kelley, Richard/K-4474-2012; OI Juda, Michael/0000-0002-4375-9688 NR 1 TC 3 Z9 3 U1 0 U2 1 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0921-4526 J9 PHYSICA B JI Physica B PD FEB PY 1994 VL 194 BP 127 EP 128 DI 10.1016/0921-4526(94)90393-X PN 1 PG 2 WC Physics, Condensed Matter SC Physics GA NB789 UT WOS:A1994NB78900067 ER PT J AU DAY, P LYSEK, M LAMADRID, M WEICHMAN, PB GOODSTEIN, D AF DAY, P LYSEK, M LAMADRID, M WEICHMAN, PB GOODSTEIN, D TI EVIDENCE FOR A PREROUGHENING TRANSITION AND A DISORDERED FLAT PHASE IN SOLID ARGON AND KRYPTON SO PHYSICA B LA English DT Article; Proceedings Paper CT 20th International Conference on Low Temperature Physics CY AUG 04-11, 1993 CL EUGENE, OR SP INT UNION PURE & APPL PHYS, AMER PHYS SOC, CITY EUGENE, INT INST REFRIGERAT, INT SCI FDN, JET PROPULS LABS, NATL SCI FDN, USN, OFF NAVAL RES, OXFORD INSTRUMENTS INC, TEKTRONIX INC, UNIV OREGON ID ADSORPTION; GRAPHITE; FILMS AB We have made high resolution heat capacity and vapor pressure measurements in argon and krypton multilayer films adsorbed on graphite that confirm the existence of new layering transitions at temperatures between the critical points of the low temperature layering transition and the bulk melting triple-point temperature. Comparison to a mass field study of a restricted solid-on-solid model shows that the observed behavior is expected when the bulk crystal has a preroughening transition leading to a disordered flat phase at its surface. C1 JET PROP LAB,PASADENA,CA 91109. RP DAY, P (reprint author), CALTECH,114-36,PASADENA,CA 91125, USA. NR 7 TC 0 Z9 0 U1 2 U2 3 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0921-4526 J9 PHYSICA B JI Physica B PD FEB PY 1994 VL 194 BP 449 EP 450 DI 10.1016/0921-4526(94)90554-1 PN 1 PG 2 WC Physics, Condensed Matter SC Physics GA NB789 UT WOS:A1994NB78900228 ER PT J AU ISRAELSSON, UE STRAYER, DM CHUI, TCP LARSON, M DUNCAN, RV AF ISRAELSSON, UE STRAYER, DM CHUI, TCP LARSON, M DUNCAN, RV TI DYNAMIC MEASUREMENTS NEAR THE LAMBDA-POINT IN A LOW-GRAVITY SIMULATOR ON THE GROUND SO PHYSICA B LA English DT Article; Proceedings Paper CT 20th International Conference on Low Temperature Physics CY AUG 04-11, 1993 CL EUGENE, OR SP INT UNION PURE & APPL PHYS, AMER PHYS SOC, CITY EUGENE, INT INST REFRIGERAT, INT SCI FDN, JET PROPULS LABS, NATL SCI FDN, USN, OFF NAVAL RES, OXFORD INSTRUMENTS INC, TEKTRONIX INC, UNIV OREGON ID SUPERFLUID TRANSITION; DEPRESSION; HELIUM; HE-4 AB The properties of liquid helium very near the lambda-transition in the presence of a heat current has received recent theoretical and experimental attention. In this regime, gravity induced pressure effects place severe constraints on the types of experiments that can be performed. A new experiment is described which largely overcomes these difficulties by magnetostrictively cancelling gravity influences in the helium sample with a suitable magnetic coil. Design limitations of the technique and a discussion of proposed experiments is presented. C1 SANDIA NATL LABS,ALBUQUERQUE,NM 87185. RP ISRAELSSON, UE (reprint author), JET PROP LAB,4800 OAK GROVE DR,PASADENA,CA 91109, USA. NR 4 TC 1 Z9 1 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0921-4526 J9 PHYSICA B JI Physica B PD FEB PY 1994 VL 194 BP 593 EP 594 DI 10.1016/0921-4526(94)90626-2 PN 1 PG 2 WC Physics, Condensed Matter SC Physics GA NB789 UT WOS:A1994NB78900300 ER PT J AU CHUI, TCP ISRAELSSON, UE LYSEK, MJ AF CHUI, TCP ISRAELSSON, UE LYSEK, MJ TI MEASUREMENT OF THE HEAT-CAPACITY OF HELIUM UNDER SUPERFLUID FLOW CONDITIONS NEAR THE LAMBDA-TRANSITION SO PHYSICA B LA English DT Article; Proceedings Paper CT 20th International Conference on Low Temperature Physics CY AUG 04-11, 1993 CL EUGENE, OR SP INT UNION PURE & APPL PHYS, AMER PHYS SOC, CITY EUGENE, INT INST REFRIGERAT, INT SCI FDN, JET PROPULS LABS, NATL SCI FDN, USN, OFF NAVAL RES, OXFORD INSTRUMENTS INC, TEKTRONIX INC, UNIV OREGON ID TEMPERATURE; DEPRESSION; HE-4 AB A proposed experiment to measure the heat capacity of helium under superfluid flow condition near the lambda transition is discussed. This experiment would clarify the role of the superfluid density depression versus the role of the intrinsic critical velocity, in the description of the property of helium. C1 JET PROP LAB,PASADENA,CA 91109. NR 11 TC 3 Z9 3 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0921-4526 J9 PHYSICA B JI Physica B PD FEB PY 1994 VL 194 BP 601 EP 602 DI 10.1016/0921-4526(94)90630-0 PN 1 PG 2 WC Physics, Condensed Matter SC Physics GA NB789 UT WOS:A1994NB78900304 ER PT J AU DUNCAN, R AKAU, R GIANOULAKIS, S ISRAELSSON, U CHUI, T AF DUNCAN, R AKAU, R GIANOULAKIS, S ISRAELSSON, U CHUI, T TI SIDEWALL THERMOMETRY PERTURBATIONS TO NONLINEAR HEAT-TRANSPORT NEAR THE LAMBDA-TRANSITION IN HE-4 SO PHYSICA B LA English DT Article; Proceedings Paper CT 20th International Conference on Low Temperature Physics CY AUG 04-11, 1993 CL EUGENE, OR SP INT UNION PURE & APPL PHYS, AMER PHYS SOC, CITY EUGENE, INT INST REFRIGERAT, INT SCI FDN, JET PROPULS LABS, NATL SCI FDN, USN, OFF NAVAL RES, OXFORD INSTRUMENTS INC, TEKTRONIX INC, UNIV OREGON ID SUPERFLUID TRANSITION AB The effect of a sidewall thermometry probe on heat transport measurements in liquid He-4 very close to the superfluid transition is simulated numerically. The effective thermal position of the probe changes with closeness of approach to the superfluid transition. The radial heat flux induced by the sidewall probe is calculated for specific probe designs. C1 JET PROP LAB,PASADENA,CA 91109. RP DUNCAN, R (reprint author), SANDIA NATL LABS,ALBUQUERQUE,NM 87185, USA. NR 4 TC 5 Z9 5 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0921-4526 J9 PHYSICA B JI Physica B PD FEB PY 1994 VL 194 BP 603 EP 604 DI 10.1016/0921-4526(94)90631-9 PN 1 PG 2 WC Physics, Condensed Matter SC Physics GA NB789 UT WOS:A1994NB78900305 ER PT J AU LIOU, WW AF LIOU, WW TI LINEAR INSTABILITY OF CURVED FREE SHEAR LAYERS SO PHYSICS OF FLUIDS LA English DT Article ID GORTLER VORTICES; MIXING LAYER; TURBULENT AB The linear inviscid hydrodynamic stability of slightly curved free mixing layers is studied in this paper. The disturbance equation is solved numerically using a shooting technique. Two mean velocity profiles that represent stably and unstably curved free mixing layers are considered. Results are shown for cases of five curvature Richardson numbers. The stability characteristics of the shear layer are found to vary significantly with the introduction of the curvature effects. The results also indicate that, in a manner similar to the Gortler vortices observed in a boundary layer along a concave wall, instability modes of spatially developing streamwise vortex pairs may appear in centrifugally unstable curved mixing layers. RP LIOU, WW (reprint author), NASA,LEWIS RES CTR,CTR MODELING TURBULENCE & TRANSIT,ICOMP,CLEVELAND,OH 44135, USA. NR 16 TC 23 Z9 23 U1 0 U2 1 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 1070-6631 J9 PHYS FLUIDS JI Phys. Fluids PD FEB PY 1994 VL 6 IS 2 BP 541 EP 549 DI 10.1063/1.868350 PN 1 PG 9 WC Mechanics; Physics, Fluids & Plasmas SC Mechanics; Physics GA NA738 UT WOS:A1994NA73800011 ER PT J AU KENNEDY, CA GATSKI, TB AF KENNEDY, CA GATSKI, TB TI SELF-SIMILAR SUPERSONIC VARIABLE-DENSITY SHEAR LAYERS IN BINARY-SYSTEMS SO PHYSICS OF FLUIDS LA English DT Article AB Some characteristic features of supersonic/supersonic, laminar, variable-density shear layers are studied by examining the self-similar behavior of five nitrogen/hydrogen streams. With the Levy-Lees transformation, the flow-field variables, which include the transverse velocity and dilatation, are obtained through the solution of the coupled set of nonlinear conservation equations. The issue of the appropriate ''third boundary condition,'' first given for the supersonic/supersonic case by Ting [J. Math. Phys. 28, 153 (1959)], is addressed and implemented in the present formulation. Expressions for the thermal conductivity, viscosity, specific heat, and binary diffusion coefficients of an arbitrary mixture are utilized so that the Prandtl and Lewis numbers and the Chapman-Rubesin parameter can vary freely across the shear layer. In the particular cases considered, these three quantities varied by factors of approximately 3, 7, and 22, respectively. The region of high vorticity moves toward the less-dense hydrogen stream for large density ratios (approximately 9:1), and becomes nearly decoupled from the density profile. Because the vorticity is responsible for the kinematic mixing of the two streams, this mixing of the two laminar streams is likely to be inhibited. Even though laminar flows are considered here, this effect is consistent with the experimental observation that as density ratios become very large, further increases in the density ratio have no effect on the turbulent shear layer growth rate. The density and hydrogen mass-fraction profiles are quite elongated in the transverse direction. An increase in the velocity ratio exaggerates both of these effects. Results obtained in this work are compatible with earlier work on incompressible, variable-density flows; more importantly, these results qualitatively resemble those from experiments of compressible and incompressible turbulent flows. C1 NASA,LANGLEY RES CTR,THEORET FLOW PHYS BRANCH,HAMPTON,VA 23665. RP KENNEDY, CA (reprint author), UNIV CALIF SAN DIEGO,DEPT APPL MECH & ENGN SCI,LA JOLLA,CA 92093, USA. NR 43 TC 7 Z9 7 U1 0 U2 8 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 1070-6631 J9 PHYS FLUIDS JI Phys. Fluids PD FEB PY 1994 VL 6 IS 2 BP 662 EP 673 DI 10.1063/1.868306 PN 1 PG 12 WC Mechanics; Physics, Fluids & Plasmas SC Mechanics; Physics GA NA738 UT WOS:A1994NA73800023 ER PT J AU EGGLETON, CD FERZIGER, JH PULLIAM, TH AF EGGLETON, CD FERZIGER, JH PULLIAM, TH TI MODERATE REYNOLDS-NUMBER ENTRY FLOW AND BOUNDARY-LAYER APPROXIMATIONS FOR A VISCOELASTIC FLUID SO PHYSICS OF FLUIDS LA English DT Article; Proceedings Paper CT Symposium on Turbulence, in honor of the 60th Birthday of William Craig Reynolds CY MAR 22-23, 1993 CL ASILOMAR CONF CTR, MONTEREY, CA HO ASILOMAR CONF CTR AB The steady-state entry flow of an Oldroyd B fluid in a plane channel is treated by perturbation analysis. The model predicts entrance lengths shorter than those of a Newtonian fluid at moderate Reynolds and small elasticity parameter. Previously proposed boundary-layer approximations produce significant errors, so new boundary-layer approximations are proposed and are shown to agree with predictions based on the full governing equations at moderate Reynolds numbers. The viscoelastic stresses grow in magnitude as the elasticity parameter increases and become singular at a finite value of the elasticity parameter, due to a breakdown of the Oldroyd B model. C1 STANFORD UNIV,DEPT MECH ENGN,STANFORD,CA 94305. NASA,AMES RES CTR,MOFFETT FIELD,CA 94035. RP EGGLETON, CD (reprint author), STANFORD UNIV,DEPT AERONAUT & ASTRONAUT,STANFORD,CA 94305, USA. NR 19 TC 4 Z9 4 U1 0 U2 1 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 1070-6631 J9 PHYS FLUIDS JI Phys. Fluids PD FEB PY 1994 VL 6 IS 2 BP 700 EP 709 DI 10.1063/1.868309 PN 2 PG 10 WC Mechanics; Physics, Fluids & Plasmas SC Mechanics; Physics GA NA739 UT WOS:A1994NA73900003 ER PT J AU GOLDSTEIN, ME AF GOLDSTEIN, ME TI NONLINEAR-INTERACTIONS BETWEEN OBLIQUE INSTABILITY WAVES ON NEARLY PARALLEL SHEAR FLOWS SO PHYSICS OF FLUIDS LA English DT Article; Proceedings Paper CT Symposium on Turbulence, in honor of the 60th Birthday of William Craig Reynolds CY MAR 22-23, 1993 CL ASILOMAR CONF CTR, MONTEREY, CA HO ASILOMAR CONF CTR ID BOUNDARY-LAYERS; ROLL-UP; EVOLUTION; TIME AB Asymptotic methods are used to describe the nonlinear self-interaction between a pair of oblique instability modes that eventually develops when initially linear, spatially growing instability waves evolve downstream in nominally two-dimensional, unbounded or semibounded, laminar shear flows. The first nonlinear reaction takes place locally within a so-called ''critical layer'' with the flow outside this layer consisting of a locally parallel mean flow plus a pair of oblique instability waves together with an associated plane wave. The instability wave amplitudes, which are completely determined by nonlinear effects within the critical layer, satisfy a pair of integral differential equations with quadratic to quartic-type nonlinearities. The most important feature of these equations is the oblique mode, self-interaction term that usually leads to a singularity at a finite downstream position. It is shown that this type of interaction is quite ubiquitous and is the dominant nonlinear interaction in many apparently unrelated shear flows-even when the oblique modes do not exhibit the most rapid growth in the initial linear stage. RP GOLDSTEIN, ME (reprint author), NASA,LEWIS RES CTR,CLEVELAND,OH 44135, USA. NR 34 TC 24 Z9 25 U1 0 U2 0 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 1070-6631 J9 PHYS FLUIDS JI Phys. Fluids PD FEB PY 1994 VL 6 IS 2 BP 724 EP 735 DI 10.1063/1.868311 PN 2 PG 12 WC Mechanics; Physics, Fluids & Plasmas SC Mechanics; Physics GA NA739 UT WOS:A1994NA73900005 ER PT J AU ZAMAN, KBMQ REEDER, MF SAMIMY, M AF ZAMAN, KBMQ REEDER, MF SAMIMY, M TI CONTROL OF AN AXISYMMETRICAL JET USING VORTEX GENERATORS SO PHYSICS OF FLUIDS LA English DT Article; Proceedings Paper CT Symposium on Turbulence, in honor of the 60th Birthday of William Craig Reynolds CY MAR 22-23, 1993 CL ASILOMAR CONF CTR, MONTEREY, CA HO ASILOMAR CONF CTR ID LAYER AB The results of an experimental investigation on the effect of vortex generators, in the form of small tabs at the nozzle exit on the evolution of a jet, are reported in this paper. Primarily tabs of triangular shape are considered, and the effect is studied up to a jet Mach number of 1.8. Each tab is found to produce a dominant pair of counter-rotating streamwise vortices having a sense of rotation opposite to that expected from the wrapping of the boundary layer. This results in an inward indentation of the mixing layer into the core of the jet. A triangular-shaped tab with its apex leaning downstream, referred to as a delta tab, is found to be the most effective in producing such vortices, with a consequential large influence on the overall jet evolution. Two delta tabs, spaced 180-degrees apart, completely bifurcate the jet. Four delta tabs stretch the mixing layer into four ''fingers,'' resulting in a significant increase in the jet mixing downstream. For six delta tabs the mixing layer distortion settles back to a three finger configuration through an interaction of the streamwise vortices. The tabs are found to be equally effective in jets with turbulent or laminar initial boundary layers. Two sources of streamwise vorticity are postulated for the flow under consideration. One is the upstream ''pressure hill '' generated by the tab, which constitutes the main contributor of vorticity to the dominant pair. Another is due to vortex filaments shed from the sides of the tab and reoriented downstream by the mean shear of the mixing layer. Depending on the orientation of the tab, the latter source can produce a vortex pair having a sense of rotation opposite to that of the dominant pair. In the case of the delta tab, vorticity from the two sources add, explaining the strong effect in that configuration. C1 OHIO STATE UNIV,DEPT MECH ENGN,COLUMBUS,OH 43210. RP ZAMAN, KBMQ (reprint author), NASA,LEWIS RES CTR,DIV INTERNAL FLUID MECH,CLEVELAND,OH 44135, USA. NR 24 TC 176 Z9 178 U1 1 U2 14 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 1070-6631 J9 PHYS FLUIDS JI Phys. Fluids PD FEB PY 1994 VL 6 IS 2 BP 778 EP 793 DI 10.1063/1.868316 PN 2 PG 16 WC Mechanics; Physics, Fluids & Plasmas SC Mechanics; Physics GA NA739 UT WOS:A1994NA73900010 ER PT J AU MOSER, RD AF MOSER, RD TI KOLMOGOROV INERTIAL RANGE SPECTRA FOR INHOMOGENEOUS TURBULENCE SO PHYSICS OF FLUIDS LA English DT Article; Proceedings Paper CT Symposium on Turbulence, in honor of the 60th Birthday of William Craig Reynolds CY MAR 22-23, 1993 CL ASILOMAR CONF CTR, MONTEREY, CA HO ASILOMAR CONF CTR ID CHANNEL; FLOWS AB It is shown that the statistical orthogonality of the Karhunen-Loeve (KL) eigenfunctions with respect to both energy and dissipation makes them a particularly good basis for the definition of an energy spectrum in inhomogeneous fluid flows. An effective wave number is defined to characterize the KL eigenfunctions. The definition preserves the relationship between the dissipation and energy spectra that holds for Fourier spectra. With the spectrum and wave number so defined, the scale-similarity arguments that lead to the existence of a spectral inertial range apply. It is also shown that the existence of a spectral inertial range in the KL eigenspectrum is consistent with Kolmogorov's scale-similarity formulation for structure functions. An example of the KL spectrum obtained from a numerically simulated plane channel flow is presented. RP MOSER, RD (reprint author), NASA,AMES RES CTR,MOFFETT FIELD,CA 94035, USA. NR 15 TC 17 Z9 18 U1 0 U2 3 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 1070-6631 J9 PHYS FLUIDS JI Phys. Fluids PD FEB PY 1994 VL 6 IS 2 BP 794 EP 801 DI 10.1063/1.868317 PN 2 PG 8 WC Mechanics; Physics, Fluids & Plasmas SC Mechanics; Physics GA NA739 UT WOS:A1994NA73900011 ER PT J AU MANSOUR, NN WRAY, AA AF MANSOUR, NN WRAY, AA TI DECAY OF ISOTROPIC TURBULENCE AT LOW-REYNOLDS-NUMBER SO PHYSICS OF FLUIDS LA English DT Article; Proceedings Paper CT Symposium on Turbulence, in honor of the 60th Birthday of William Craig Reynolds CY MAR 22-23, 1993 CL ASILOMAR CONF CTR, MONTEREY, CA HO ASILOMAR CONF CTR ID VELOCITY-DERIVATIVE SKEWNESS; FLOWS AB Decay of isotropic turbulence is computed using direct numerical simulations. Comparisons with experimental spectra at moderate and low Reynolds numbers (R(lambda) < 70) show good agreement. At moderate to high Reynolds numbers (R(lambda) > 50), the spectra are found to collapse with Kolmogorov scaling at high wave numbers. However, at low Reynolds numbers (R(lambda) < 50) the shape of the spectra at the Kolmogorov length scales is Reynolds number dependent. Direct simulation data from flowfields of decaying isotropic turbulence are used to compute the terms in the equation for the dissipation rate of the turbulent kinetic energy. The development of the skewness and the net destruction of the turbulence dissipation rate in the limit of low Reynolds numbers are presented. The nonlinear terms are found to remain active at surprisingly low Reynolds numbers. RP MANSOUR, NN (reprint author), NASA,AMES RES CTR,MOFFETT FIELD,CA 94035, USA. NR 19 TC 78 Z9 81 U1 0 U2 0 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 1070-6631 J9 PHYS FLUIDS JI Phys. Fluids PD FEB PY 1994 VL 6 IS 2 BP 808 EP 814 DI 10.1063/1.868319 PN 2 PG 7 WC Mechanics; Physics, Fluids & Plasmas SC Mechanics; Physics GA NA739 UT WOS:A1994NA73900013 ER PT J AU ANTONIA, RA KIM, J AF ANTONIA, RA KIM, J TI A NUMERICAL STUDY OF LOCAL ISOTROPY OF TURBULENCE SO PHYSICS OF FLUIDS LA English DT Article; Proceedings Paper CT Symposium on Turbulence, in honor of the 60th Birthday of William Craig Reynolds CY MAR 22-23, 1993 CL ASILOMAR CONF CTR, MONTEREY, CA HO ASILOMAR CONF CTR ID SCALE TURBULENCE; FIELDS; LAYER; FLOW AB The degree to which local isotropy applies is examined using databases obtained from numerical simulations of a variety of turbulent flows at low Reynolds numbers. Simulations of a turbulent channel flow were used to obtain most of the results but simulations of other flows, e.g. homogeneous isotropic turbulence, a homogeneous shear flow, and a turbulent mixing layer, have also been considered. Attention is mainly given to the high wave number part of the vorticity and temperature derivative spectra. The ratio of these spectra and their isotropic values depends on the particular quantity considered, the departure from isotropy being more pronounced for the temperature derivative than for the vorticity. When the Kolmogorov-normalized wave number is sufficiently large, isotropy is approximately satisfied provided the (Kolmogorov-normalized) mean strain rate is sufficiently small. This result appears to be independent of the quantity considered and of the Reynolds number. C1 NASA,AMES RES CTR,TURBULENCE & TRANSIT PHYS BRANCH,MOFFETT FIELD,CA 94035. RP ANTONIA, RA (reprint author), UNIV NEWCASTLE,DEPT MECH ENGN,NEWCASTLE,NSW 2308,AUSTRALIA. NR 30 TC 42 Z9 42 U1 0 U2 1 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 1070-6631 J9 PHYS FLUIDS JI Phys. Fluids PD FEB PY 1994 VL 6 IS 2 BP 834 EP 841 DI 10.1063/1.868321 PN 2 PG 8 WC Mechanics; Physics, Fluids & Plasmas SC Mechanics; Physics GA NA739 UT WOS:A1994NA73900015 ER PT J AU ROGERS, MM MOSER, RD AF ROGERS, MM MOSER, RD TI DIRECT SIMULATION OF A SELF-SIMILAR TURBULENT MIXING LAYER SO PHYSICS OF FLUIDS LA English DT Article; Proceedings Paper CT Symposium on Turbulence, in honor of the 60th Birthday of William Craig Reynolds CY MAR 22-23, 1993 CL ASILOMAR CONF CTR, MONTEREY, CA HO ASILOMAR CONF CTR ID SHEAR-LAYER; REYNOLDS-NUMBER; PLANE; TRANSITION; VORTICITY; DENSITY; ORIGIN; SCALES; FLOWS AB Three direct numerical simulations of incompressible turbulent plane mixing layers have been performed. All the simulations were initialized with the same two velocity fields obtained from a direct numerical simulation of a turbulent boundary layer with a momentum thickness Reynolds number of 300 computed by Spalart [J. Fluid Mech. 187, 61 (1988)]. In addition to a baseline case with no additional disturbances, two simulations were begun with two-dimensional disturbances of varying strength in addition to the boundary layer turbulence. After a development stage, the baseline case and the case with weaker additional two-dimensional disturbances evolve self-similarly, reaching visual thickness Reynolds numbers of up to 20 000. This self-similar period is characterized by a lack of large-scale organized pairings, a lack of streamwise vortices in the ''braid'' regions, and scalar mixing that is characterized by ''marching'' probability density functions (PDFs). The case begun with strong additional two-dimensional disturbances only becomes approximately self-similar, but exhibits sustained organized large-scale pairings, clearly defined braid regions with streamwise vortices that span them, and scalar PDFs that are ''nonmarching.'' It is also characterized by much more intense vertical velocity fluctuations than the other two cases. The statistics and structures in several experiments involving turbulent mixing layers are in better agreement with those of the simulations that do not exhibit organized pairings. RP ROGERS, MM (reprint author), NASA,AMES RES CTR,MOFFETT FIELD,CA 94035, USA. NR 53 TC 201 Z9 206 U1 0 U2 15 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 1070-6631 J9 PHYS FLUIDS JI Phys. Fluids PD FEB PY 1994 VL 6 IS 2 BP 903 EP 923 DI 10.1063/1.868325 PN 2 PG 21 WC Mechanics; Physics, Fluids & Plasmas SC Mechanics; Physics GA NA739 UT WOS:A1994NA73900019 ER PT J AU CHASNOV, JR AF CHASNOV, JR TI SIMILARITY STATES OF PASSIVE SCALAR TRANSPORT IN ISOTROPIC TURBULENCE SO PHYSICS OF FLUIDS LA English DT Article; Proceedings Paper CT Symposium on Turbulence, in honor of the 60th Birthday of William Craig Reynolds CY MAR 22-23, 1993 CL ASILOMAR CONF CTR, MONTEREY, CA HO ASILOMAR CONF CTR ID LARGE-EDDY SIMULATION; SPECTRAL CLOSURES; DIFFUSION; DECAY AB By simple analytical and large-eddy simulations, the time evolution of the kinetic energy and scalar variance in decaying isotropic turbulence transporting passive scalars are determined. The evolution of a passive scalar field with and without a uniform mean gradient is considered. First, similarity states of the flow during the final period of decay are discussed. Exact analytical solutions may be obtained, and these depend only on the form of the energy and scalar-variance spectra at low wave numbers, and the molecular transport coefficients. The solutions for a passive scalar field with mean-scalar gradient are of special interest, and we find that the scalar variance may grow or decay asymptotically in the final period, depending on the initial velocity distribution. Second, similarity states of the flow at high Reynolds and Peclet numbers are considered. Here it is assumed that the solutions also depend on the low-wave-number spectral coefficients, but not on the molecular transport coefficients. This results in a nonlinear dependence of the kinetic energy and scalar variance on the spectral coefficients, in contrast to the final period results. The analytical results obtained may be exact when the similarity solutions depend only on spectral coefficients that are time invariant. The present analysis also leads directly to a similarity state for a passive scalar field with uniform mean scalar gradient. Last, large-eddy simulations of the flow field are performed to test the theoretical results. Asymptotic similarity states at large times in the simulations are obtained and found to be in good agreement with predictions of the analysis. Several dimensionless quantities are also determined, which compare favorably to earlier experimental results. An argument for the inertial subrange scaling of the scalar-flux spectrum is presented, which yields a spectrum proportional to the scalar gradient and decaying as k-7/3. This result is partially supported by the small-scale statistics of the large-eddy simulations. C1 NASA,AMES RES CTR,CTR TURBULENCE RES,MOFFETT FIELD,CA 94035. NR 38 TC 45 Z9 46 U1 0 U2 1 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 1070-6631 J9 PHYS FLUIDS JI Phys. Fluids PD FEB PY 1994 VL 6 IS 2 BP 1036 EP 1051 DI 10.1063/1.868337 PN 2 PG 16 WC Mechanics; Physics, Fluids & Plasmas SC Mechanics; Physics GA NA739 UT WOS:A1994NA73900030 ER PT J AU MAHESH, K LELE, SK MOIN, P AF MAHESH, K LELE, SK MOIN, P TI THE RESPONSE OF ANISOTROPIC TURBULENCE TO RAPID HOMOGENEOUS ONE-DIMENSIONAL COMPRESSION SO PHYSICS OF FLUIDS LA English DT Article; Proceedings Paper CT Symposium on Turbulence, in honor of the 60th Birthday of William Craig Reynolds CY MAR 22-23, 1993 CL ASILOMAR CONF CTR, MONTEREY, CA HO ASILOMAR CONF CTR ID DISTORTION THEORY AB Homogeneous rapid distortion theory is used to study the response of shear flows and axisymmetric turbulence to rapid one-dimensional compression. In the shear flow problem, both normal and oblique compressions are considered. The response of these anisotropic flows to compression is found to be quite different from that of isotropic turbulence. Upon normal compression, the amplification of the streamwise component of kinetic energy and the total kinetic energy in shear flows is higher than that in isotropic turbulence. Also, normal compression decreases the magnitude of the Reynolds shear stress by amplifying the pressure-strain correlation in the shear stress equation. Obliquity of compression (defined as the angle between the directions of shear and compression) is seen to significantly affect the evolution of the Reynolds stresses. For a range of oblique angles from -60-degrees to 60-degrees, the amplification of streamwise kinetic energy and total kinetic energy decrease with increasing magnitude of the oblique angle. Also, the tendency of the shear stress to decrease in magnitude is diminished upon increasing the oblique angle; for large oblique angles the shear stress amplifies. Upon compression along the axis of axisymmetry, the amplification of the streamwise component of kinetic energy is higher for contracted turbulence than for isotropic turbulence, while the amplification of the total kinetic energy is lower. The above results are interpreted in a more general framework. It is shown that the amplification of the streamwise component of kinetic energy is determined by the initial E11(kappa1) (x1 is the direction of compression). Flows with u1 at lower kappa1 have a lower effect of pressure during compression and hence, higher amplification of u1(2)BAR. The amplification of the total kinetic energy is determined by the initial fraction of energy along the direction of compression (u1(2)BAR/q2) and the initial E11(kappa1). Flows with higher initial u1(2)BAR/q2 and with u1 at lower kappa1 have a larger amplification of q2. C1 STANFORD UNIV,DEPT AERONAUT & ASTRONAUT,STANFORD,CA 94305. NASA,AMES RES CTR,MOFFETT FIELD,CA 94035. RP MAHESH, K (reprint author), STANFORD UNIV,DEPT MECH ENGN,STANFORD,CA 94305, USA. NR 27 TC 8 Z9 8 U1 0 U2 0 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 1070-6631 J9 PHYS FLUIDS JI Phys. Fluids PD FEB PY 1994 VL 6 IS 2 BP 1052 EP 1062 DI 10.1063/1.868338 PN 2 PG 11 WC Mechanics; Physics, Fluids & Plasmas SC Mechanics; Physics GA NA739 UT WOS:A1994NA73900031 ER PT J AU HUSSAIN, F MOIN, P MANSOUR, N FERZIGER, J AF HUSSAIN, F MOIN, P MANSOUR, N FERZIGER, J TI IN HONOR OF REYNOLDS,WILLIAM,CRAIG ON THE OCCASION OF HIS 60TH BIRTHDAY SO PHYSICS OF FLUIDS LA English DT Editorial Material C1 NASA,AMES RES CTR,MOFFETT FIELD,CA 94035. STANFORD UNIV,STANFORD,CA 94305. RP HUSSAIN, F (reprint author), UNIV HOUSTON,HOUSTON,TX 77004, USA. NR 0 TC 0 Z9 0 U1 0 U2 1 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 1070-6631 J9 PHYS FLUIDS JI Phys. Fluids PD FEB PY 1994 VL 6 IS 2 BP R3 EP R3 PN 2 PG 1 WC Mechanics; Physics, Fluids & Plasmas SC Mechanics; Physics GA NA739 UT WOS:A1994NA73900001 ER PT J AU BALDI, P CHAUVIN, Y HUNKAPILLER, T MCCLURE, MA AF BALDI, P CHAUVIN, Y HUNKAPILLER, T MCCLURE, MA TI HIDDEN MARKOV-MODELS OF BIOLOGICAL PRIMARY SEQUENCE INFORMATION SO PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA LA English DT Article DE MULTIPLE SEQUENCE ALIGNMENTS; PROTEIN MODELING; ADAPTIVE ALGORITHMS; SEQUENCE CLASSIFICATION ID AMINO-ACID-SEQUENCES; MAXIMUM-LIKELIHOOD; PROTEIN-KINASES; DNA-SEQUENCES; EM ALGORITHM; ALIGNMENT; IDENTIFICATION; RECOGNITION; FEATURES AB Hidden Markov model (HMM) techniques are used to model families of biological sequences. A smooth and convergent algorithm is introduced to iteratively adapt the transition and emission parameters of the models from the examples in a given family. The HMM approach is applied to three protein families: globins, immunoglobulins, and kinases. In all cases, the models derived capture the important statistical characteristics of the family and can be used for a number of tasks, including multiple alignments, motif detection, and classification. For K sequences of average length N, this approach yields an effective multiple-alignment algorithm which requires O(KN2) operations, linear in the number of sequences. C1 NETID INC, SAN FRANCISCO, CA 94107 USA. UNIV WASHINGTON, DEPT MOLEC BIOTECHNOL, SEATTLE, WA 98195 USA. UNIV CALIF IRVINE, DEPT ECOL & EVOLUT BIOL, IRVINE, CA 92717 USA. JET PROP LAB, PASADENA, CA 91109 USA. STANFORD UNIV, DEPT PSYCHOL, STANFORD, CA 94025 USA. RP CALTECH, DIV BIOL, PASADENA, CA 91125 USA. NR 26 TC 243 Z9 251 U1 1 U2 14 PU NATL ACAD SCIENCES PI WASHINGTON PA 2101 CONSTITUTION AVE NW, WASHINGTON, DC 20418 USA SN 0027-8424 J9 P NATL ACAD SCI USA JI Proc. Natl. Acad. Sci. U. S. A. PD FEB 1 PY 1994 VL 91 IS 3 BP 1059 EP 1063 DI 10.1073/pnas.91.3.1059 PG 5 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA MV278 UT WOS:A1994MV27800049 PM 8302831 ER PT J AU GOWARD, SN WILLIAMS, DL PETERSON, DL AF GOWARD, SN WILLIAMS, DL PETERSON, DL TI NASA MULTISENSOR AIRCRAFT CAMPAIGNS FOR THE STUDY OF FOREST ECOSYSTEMS - PREFACE SO REMOTE SENSING OF ENVIRONMENT LA English DT Editorial Material C1 NASA,AMES RES CTR,ECOSYST SCI & TECHNOL BRANCH,MOFFETT FIELD,CA 94035. NASA,GODDARD SPACE FLIGHT CTR,BIOSPHER SCI BRANCH,GREENBELT,MD 20771. RP GOWARD, SN (reprint author), UNIV MARYLAND,DEPT GEOG,GLOBAL REMOTE SENSING STUDIES LAB,COLL PK,MD 20742, USA. NR 2 TC 7 Z9 7 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 1994 VL 47 IS 2 BP 107 EP 108 DI 10.1016/0034-4257(94)90147-3 PG 2 WC Environmental Sciences; Remote Sensing; Imaging Science & Photographic Technology SC Environmental Sciences & Ecology; Remote Sensing; Imaging Science & Photographic Technology GA NN406 UT WOS:A1994NN40600001 ER PT J AU SALAS, WA RANSON, JK ROCK, BN SMITH, KT AF SALAS, WA RANSON, JK ROCK, BN SMITH, KT TI TEMPORAL AND SPATIAL VARIATIONS IN DIELECTRIC-CONSTANT AND WATER STATUS OF DOMINANT FOREST SPECIES FROM NEW-ENGLAND SO REMOTE SENSING OF ENVIRONMENT LA English DT Article ID TREES; STEMS AB Temporal and spatial characteristics of microwave dielectric properties and water status of several forest species were investigated during the 1990 and 1991 growing seasons as part of the NASA FED MAC. Data presented were acquired from Durham, New Hampshire (white pine, eastern hemlock, and American beech), and Howland, Maine (eastern hemlock and red spruce). Dielectric properties of trunk wood were measured using C-band, L-band, and P-band dielectric probes. For the Durham specimens, electrical resistance was measured using a digital ohmmeter. Water status of the trees studied was determined either by use of a Scholander pressure bomb on branch samples or by fresh weight/dry weight assessment of wood core samples. Results indicate the following: 1) Radial dielectric profiles matched the regions of the functional sapwood such that the sapwood was characterized by a higher dielectric than the bark and heartwood tissues. 2) A hysteresis exists between diurnal variations in branch water potential and trunk sapwood dielectric. 3) The dielectric properties were positively correlated with wood core moisture content, while the electrical resistance was poorly correlated with moisture content. 4) Using categories of electrical resistance measurements as a qualitative assessment of relative ion concentrations the dielectric measurements were not sensitive to the different ion concentrations within the xylem and phloem exudate. These results support the view that dielectric properties are strongly correlated with moisture status in trunk wood and that diurnal variations in dielectric are related to diurnal fluctuations in water potential. The lag between changes in branch water potential and trunk dielectric varies, depending on the structure, evaporative demand, and water storage capacity of the sapwood. C1 US FOREST SERV,NE FOREST EXPTL STN,DURHAM,NH. NASA,GODDARD SPACE FLIGHT CTR,BIOSPHER SCI BRANCH,GREENBELT,MD 20771. RP SALAS, WA (reprint author), UNIV NEW HAMPSHIRE,COMPLEX SYST RES CTR,DURHAM,NH 03824, USA. NR 29 TC 14 Z9 14 U1 3 U2 5 PU ELSEVIER SCIENCE INC PI NEW YORK PA 655 AVENUE OF THE AMERICAS, NEW YORK, NY 10010 SN 0034-4257 J9 REMOTE SENS ENVIRON JI Remote Sens. Environ. PD FEB PY 1994 VL 47 IS 2 BP 109 EP 119 DI 10.1016/0034-4257(94)90148-1 PG 11 WC Environmental Sciences; Remote Sensing; Imaging Science & Photographic Technology SC Environmental Sciences & Ecology; Remote Sensing; Imaging Science & Photographic Technology GA NN406 UT WOS:A1994NN40600002 ER PT J AU WEISHAMPEL, JF SUN, GQ RANSON, KJ LEJEUNE, KD SHUGART, HH AF WEISHAMPEL, JF SUN, GQ RANSON, KJ LEJEUNE, KD SHUGART, HH TI FOREST TEXTURAL PROPERTIES FROM SIMULATED MICROWAVE BACKSCATTER - THE INFLUENCE OF SPATIAL-RESOLUTION SO REMOTE SENSING OF ENVIRONMENT LA English DT Article ID RADAR BACKSCATTER; L-BAND; PLANT-COMMUNITIES; CANOPY STRUCTURE; BIOMASS; STANDS; PATTERN; MODEL; SCALE AB To explore the effects of radar scene degradation on the interpretation of forest pattern, we used a model to simulate L-band (23 cm) backscatter (VV, HV, and HH, polarizations) for a range of resolutions (5 m, 10 m, 12.1 m, 15 m, and 24.2 m). Simulated pixels were parameterized with tree density and height for each tree (> 3 cm dbh) covering a 200 m x 150 m area from an immature, conifer-dominated stand in the Northern Experimental Forest located near Howland, Maine. Airborne synthetic aperture radar (AIRSAR) imagery from the stand was used to evaluate the ability of the model to predict single pixel and textural patterns at 12.1 m resolution. Although the model was unable to accurately predict pixel-by-pixel responses, probably due to registration error, textural patterns from the HH polarized image were correlated to the simulated patterns. The model's assumption Of randomly distributed sterns within each pixel was another probable source of error as trees in this stand were aggregated at scales from 1 m to 50 m. Despite model inadequacies, significant pattern was found at all simulated backscatter resolutions for all polarizations for most quadrat sizes (< 10,000 m2), but only for smaller quadrat sizes (< 6,000 m2) for within-pixel structural properties (i.e., stem, branch, and leaf biomasses, stem density, and average height). This suggests that radar textural information resulting from forest heterogeneity should be available at scales coarser than 24.2 m for forests of similar structure. C1 SSAI,LANHAM,MD. NASA,GODDARD SPACE FLIGHT CTR,BIOSPHER SCI BRANCH,GREENBELT,MD 20771. RCG HAGLER BAILLEY INC,BOULDER,CO. RP WEISHAMPEL, JF (reprint author), UNIV VIRGINIA,DEPT ENVIRONM SCI,CHARLOTTESVILLE,VA 22903, USA. RI Ranson, Kenneth/G-2446-2012; Shugart, Herman/C-5156-2009 OI Ranson, Kenneth/0000-0003-3806-7270; NR 39 TC 11 Z9 11 U1 1 U2 4 PU ELSEVIER SCIENCE INC PI NEW YORK PA 655 AVENUE OF THE AMERICAS, NEW YORK, NY 10010 SN 0034-4257 J9 REMOTE SENS ENVIRON JI Remote Sens. Environ. PD FEB PY 1994 VL 47 IS 2 BP 120 EP 131 DI 10.1016/0034-4257(94)90149-X PG 12 WC Environmental Sciences; Remote Sensing; Imaging Science & Photographic Technology SC Environmental Sciences & Ecology; Remote Sensing; Imaging Science & Photographic Technology GA NN406 UT WOS:A1994NN40600003 ER PT J AU LANG, RH CHAUHAN, NS RANSON, KJ KILIC, O AF LANG, RH CHAUHAN, NS RANSON, KJ KILIC, O TI MODELING P-BAND SAR RETURNS FROM A RED PINE STAND SO REMOTE SENSING OF ENVIRONMENT LA English DT Article ID ELECTROMAGNETIC BACKSCATTERING; FINITE LENGTH; VEGETATION; SCATTERING; FOREST; LAYER AB Bright P-band synthetic aperture radar (SAR) returns from red pine forests were observed on SAR images taken in the area of Bangor, Maine. A plot of red pine trees in the University of Maine research forest was selected for the characterization and modeling. The purpose of this effort was to understand the cause of the high P-band returns. The red pine stand under study consisted of mature trees with an average height of 25 ms and diameters at breast height (DBH) of 28-38 cm. Soil moisture and soil bulk density measurements were made along with ground rough surface profiles. A tree was cut down in such a manner to keep its crown completely intact. Detailed biomass measurements of the needles, branches and trunks were also made. These site statistics have been used in a distorted Born approximation model of the forest stand. Computations indicate that the direct-reflected contributions from the ground are responsible for the high P-band HH observed returns. Tapered tree trunks have been used in the model to improve the accuracy of the direct-reflected calculation. The high P-band returns from red pine contrast with the results from previous studies of a hemlock forest in the area, which have lower P-band returns mainly due to backscattering from branches. C1 NASA,GODDARD SPACE FLIGHT CTR,TERRESTRIAL PHYS LAB,GREENBELT,MD 20771. RP LANG, RH (reprint author), GEORGE WASHINGTON UNIV,DEPT ELECT ENGN & COMP SCI,WASHINGTON,DC 20052, USA. RI Ranson, Kenneth/G-2446-2012 OI Ranson, Kenneth/0000-0003-3806-7270 NR 15 TC 14 Z9 15 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 1994 VL 47 IS 2 BP 132 EP 141 DI 10.1016/0034-4257(94)90150-3 PG 10 WC Environmental Sciences; Remote Sensing; Imaging Science & Photographic Technology SC Environmental Sciences & Ecology; Remote Sensing; Imaging Science & Photographic Technology GA NN406 UT WOS:A1994NN40600004 ER PT J AU RANSON, KJ SUN, GQ AF RANSON, KJ SUN, GQ TI NORTHERN FOREST CLASSIFICATION USING TEMPORAL MULTIFREQUENCY AND MULTIPOLARIMETRIC SAR IMAGES SO REMOTE SENSING OF ENVIRONMENT LA English DT Article ID RADAR IMAGES; CALIBRATION; ECOSYSTEM; MODELS AB Characterizing a forest ecosystem dynamics for global change studies requires updated knowledge in terms of species composition, carbon storage, and biophysical functioning. Often, significant areas of forest are obscured by clouds or are under reduced solar illumination conditions, which limit acquisition of optical satellite data. Synthetic aperture radar (SAR) images, however, can be acquired under these conditions. Several SAR image data sets were acquired over the Northern Experimental Forest near Howland, Maine as part of the Forest Ecosystem Dynamics-Multisensor Aircraft Campaign. A SAR data processing and analysis sequence, from calibration through classification, is described. The usefulness of multifrequency temporal polarimetric SAR image data for identifying ecosystem classes is discussed. Our results show that with principal component analysis of temporal data sets (winter and late summer) SAR images can be classified into general forest categories such as softwood, hardwood, regeneration, and clearing with better than 80% accuracy. Other nonforest classes such as bogs, wetlands, grass, and water were also accurately classified. Classifications from single date images suffered in accuracy. The winter image had significant confusion of softwoods and hardwoods with a strong tendency to overestimate hardwoods. Modeling results suggest that increased double-bounce scattering of the radar beam from conifer stands because of lowered dielectric constant of frozen needles and branches was the contributing factor for the misclassifications. C1 SCI SYST & APPLICAT INC,LANHAM,MD. RP RANSON, KJ (reprint author), NASA,GODDARD SPACE FLIGHT CTR,CODE 923,GREENBELT,MD 20771, USA. RI Ranson, Kenneth/G-2446-2012 OI Ranson, Kenneth/0000-0003-3806-7270 NR 36 TC 53 Z9 53 U1 0 U2 5 PU ELSEVIER SCIENCE INC PI NEW YORK PA 655 AVENUE OF THE AMERICAS, NEW YORK, NY 10010 SN 0034-4257 J9 REMOTE SENS ENVIRON JI Remote Sens. Environ. PD FEB PY 1994 VL 47 IS 2 BP 142 EP 153 DI 10.1016/0034-4257(94)90151-1 PG 12 WC Environmental Sciences; Remote Sensing; Imaging Science & Photographic Technology SC Environmental Sciences & Ecology; Remote Sensing; Imaging Science & Photographic Technology GA NN406 UT WOS:A1994NN40600005 ER PT J AU MOGHADDAM, M DURDEN, S ZEBKER, H AF MOGHADDAM, M DURDEN, S ZEBKER, H TI RADAR MEASUREMENT OF FORESTED AREAS DURING OTTER SO REMOTE SENSING OF ENVIRONMENT LA English DT Article ID REGIONAL APPLICATIONS; ECOSYSTEM PROCESSES; GENERAL-MODEL; SIGNATURES; BIOMASS; CANOPY AB To test a forest ecosystem model in the Oregon Transect Ecosystem Research (OTTER) project, it is desirable to find forest canopy parameters via radar remote sensing measurements. Conventionally,forest biomass, along with quantities such as the leaf area index, drives the model. However, it is shown from the SAR data collected over the OTTER sites that the backscatter is not uniquely related to biomass. A sensitivity study is carried out using a scattering model to determine the variation of radar cross section as a function of several forest parameters. The results verify the above observation, and lead to the selection of suitable quantities to be recovered via radar experiments. Since this forest scattering model cannot be easily used for inversion of unknown parameters, the use of simplified models in forest parameter estimation schemes is suggested. RP MOGHADDAM, M (reprint author), JET PROP LAB,4800 OAK GROVE DR,PASADENA,CA 91109, USA. NR 18 TC 27 Z9 27 U1 0 U2 3 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 1994 VL 47 IS 2 BP 154 EP 166 DI 10.1016/0034-4257(94)90152-X PG 13 WC Environmental Sciences; Remote Sensing; Imaging Science & Photographic Technology SC Environmental Sciences & Ecology; Remote Sensing; Imaging Science & Photographic Technology GA NN406 UT WOS:A1994NN40600006 ER PT J AU SMITH, JA GOLTZ, SM AF SMITH, JA GOLTZ, SM TI UPDATED THERMAL-MODEL USING SIMPLIFIED SHORT-WAVE RADIOSITY CALCULATIONS SO REMOTE SENSING OF ENVIRONMENT LA English DT Article ID SURFACE-TEMPERATURE; CANOPY; VEGETATION; FOREST; DISTRIBUTIONS; EMISSIVITY; SIMULATION; RADIATION; RADIANCE; HEMLOCK AB An extension to a forest canopy thermal radiance model is described that computes the short-wave energy flux absorbed within the canopy by solving simplified radiosity equations describing flux transfers between canopy ensemble classes partitioned by vegetation layer and leaf slope. Integrated short-wave reflectance and transmittance factors obtained from measured leaf optical properties were found to be nearly equal for the canopy studied. Short-wave view factor matrices were approximated by combining the average leaf scattering coefficient with the long-wave view factor matrices already incorporated in the model. Both the updated and original models were evaluated for a dense spruce-fir forest study site in Central Maine. Canopy short-wave absorption coefficients estimated from detailed Monte Carlo ray tracing calculations were 0.60, 0.04, and 0.03 for the top, middle, and lower canopy layers corresponding to leaf area indices of 4.0, 1.05, and 0.25. The simplified radiosity technique yielded analogous absorption values of 0.55, 0.03, and 0.01. The resulting root mean square error in modeled versus measured canopy temperatures for all layers was less than 1-degrees-C with either technique. Maximum error in predicted temperature using the simplified radiosity technique was approximately 2-degrees-C during peak solar heating. RP SMITH, JA (reprint author), NASA,GODDARD SPACE FLIGHT CTR,TERR PHYS LAB,CODE 920,GREENBELT,MD 20771, USA. NR 32 TC 7 Z9 7 U1 0 U2 3 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 1994 VL 47 IS 2 BP 167 EP 175 DI 10.1016/0034-4257(94)90153-8 PG 9 WC Environmental Sciences; Remote Sensing; Imaging Science & Photographic Technology SC Environmental Sciences & Ecology; Remote Sensing; Imaging Science & Photographic Technology GA NN406 UT WOS:A1994NN40600007 ER PT J AU ROCK, BN WILLIAMS, DL MOSS, DM LAUTEN, GN KIM, M AF ROCK, BN WILLIAMS, DL MOSS, DM LAUTEN, GN KIM, M TI HIGH-SPECTRAL-RESOLUTION FIELD AND LABORATORY OPTICAL REFLECTANCE MEASUREMENTS OF RED SPRUCE AND EASTERN HEMLOCK NEEDLES AND BRANCHES SO REMOTE SENSING OF ENVIRONMENT LA English DT Article ID CONIFER NEEDLES; CHLOROPHYLL-A; CANOPY; N,N-DIMETHYLFORMAMIDE; LEAVES AB Branch samples were collected from canopies of red spruce (Picea rubens) and eastern hemlock (Tsuga canadensis) on 11 and 12 September 1989 and 5 and 6 September 1990, and spectrally characterized by needle age class (first- and second-year). Needles from the branch samples were analyzed for complete optical properties (0.4-1.0 mum), pigment content (total chlorophylls), and anatomical (cellular) condition. Spectral differences between spruce and hemlock first- and second-year needles include differences in green peak reflectance features, red edge parameters, and amplitude features of the NIR plateau. Second-year needles of both species exhibit increased absorptance in the NIR when compared with first-year needles. Chlorophyll concentrations, as determined using both quantitative and empirical techniques [ratio analysis of reflectance spectra (RARS)] were greater in second-year needles in both species and highest overall in second-year hemlock needles. Substantial anatomical differences are seen between needles of the two species, as well as between age classes of the same species. Relative differences among total area occupied by cells, intercellular void space, and total needle volume likely contribute to the differences in the NIR response patterns observed. The reflectance spectra (0.4-2.5 mum) measured for single age-class branch segments of both species are similar in shape to reflectance spectra measured at the needle level. However, differences in the magnitude of reflectance are seen when branch and needle data are compared. C1 NASA,GODDARD SPACE FLIGHT CTR,BIOSPHER SCI BRANCH,TERR PHYS LAB,GREENBELT,MD 20771. UNIV MARYLAND,DEPT GEOG,COLL PK,MD 20742. RP ROCK, BN (reprint author), UNIV NEW HAMPSHIRE,COMPLEX SYST RES CTR,DURHAM,NH 03824, USA. NR 31 TC 38 Z9 41 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 1994 VL 47 IS 2 BP 176 EP 189 DI 10.1016/0034-4257(94)90154-6 PG 14 WC Environmental Sciences; Remote Sensing; Imaging Science & Photographic Technology SC Environmental Sciences & Ecology; Remote Sensing; Imaging Science & Photographic Technology GA NN406 UT WOS:A1994NN40600008 ER PT J AU LAWRENCE, WT WILLIAMS, DL RANSON, KJ IRONS, JR WALTHALL, CL AF LAWRENCE, WT WILLIAMS, DL RANSON, KJ IRONS, JR WALTHALL, CL TI COMPARATIVE-ANALYSIS OF DATA ACQUIRED BY 3 NARROW-BAND AIRBORNE SPECTRORADIOMETERS OVER SUBBOREAL VEGETATION SO REMOTE SENSING OF ENVIRONMENT LA English DT Article ID REFLECTANCES; ECOSYSTEM; FIFE AB Calibrated radiance data were acquired with three airborne sensor systems on 8 September 1990 over a northern forest as part of the Forest Ecosystem Dynamics Multisensor Aircraft Campaign. The spectral data were acquired nearly simultaneously under extremely clear sky conditions with NASA's AVIRIS and ASAS imaging spectroradiometers, and an SE-590 spectroradiometer mounted on a NASA UH-1B helicopter. After atmospheric corrections were applied to these data, intercomparisons Of nadir reflectance factor measurements from each of these sensors were made for four important vegetation communities including a bog and individual forest stands dominated by spruce (Picea sp.), eastern hemlock (Tsuga canadensis), and mixed northern hardwoods (dominated by Acer sp., Populus sp., and Betula sp.), respectively. The reflectance factor spectra from the different instruments were comparable for each of these cover types, suggesting the possible interchangeable use of the three datasets over comparable wavelength regions. These comparisons also serve to graphically illustrate the importance of applying atmospheric corrections to such data, even if acquired under extremely clear sky conditions. This remote sensing data set appears suitable for assessing the applicability of multistage, multisensor data in large-scale ecological research. C1 NASA,GODDARD SPACE FLIGHT CTR,BIOSPHER SCI BRANCH,GREENBELT,MD 20771. RP LAWRENCE, WT (reprint author), UNIV MARYLAND,DEPT GEOG,1113 LEFRAK HALL,COLL PK,MD 20742, USA. RI Irons, James/D-8535-2012; Ranson, Kenneth/G-2446-2012 OI Ranson, Kenneth/0000-0003-3806-7270 NR 29 TC 7 Z9 7 U1 0 U2 2 PU ELSEVIER SCIENCE INC PI NEW YORK PA 655 AVENUE OF THE AMERICAS, NEW YORK, NY 10010 SN 0034-4257 J9 REMOTE SENS ENVIRON JI Remote Sens. Environ. PD FEB PY 1994 VL 47 IS 2 BP 204 EP 215 DI 10.1016/0034-4257(94)90156-2 PG 12 WC Environmental Sciences; Remote Sensing; Imaging Science & Photographic Technology SC Environmental Sciences & Ecology; Remote Sensing; Imaging Science & Photographic Technology GA NN406 UT WOS:A1994NN40600010 ER PT J AU JOHNSON, LF HLAVKA, CA PETERSON, DL AF JOHNSON, LF HLAVKA, CA PETERSON, DL TI MULTIVARIATE-ANALYSIS OF AVIRIS DATA FOR CANOPY BIOCHEMICAL ESTIMATION ALONG THE OREGON TRANSECT SO REMOTE SENSING OF ENVIRONMENT LA English DT Article ID INFRARED REFLECTANCE SPECTROSCOPY; LEAF CHEMISTRY; FOREST CANOPY; NITROGEN; DECOMPOSITION; DYNAMICS AB High spectral resolution data from the Airborne Visible/Infrared Imaging Spectrometer (AVIRIS) acquired over several forest stands in west-central Oregon were analyzed with respect to variations in forest canopy biochemical content (kg ha-1), foliar biochemical concentration (mg cm2 leaf area), and leaf area index (LAI). The Lowtran-7 atmospheric radiative transfer code was used to convert AVIRIS at-sensor radiance into reflectance factor The correlation of reflectance factor and first-difference AVIRIS spectra with total nitrogen (TN), lignin, starch, total chlorophyll content (kg ha-1), and LAI is presented. Correlogram structure in the 1200-2400 nm region is compared with the occurrence of known absorption features associated with organic molecular bonds which comprise foliar biochemical constituents. Regression equations relating the first-difference AVIRIS data to chemical variables and LAI were developed. The chlorophyll red edge spectral region was strongly related to LAI, canopy TN content, and canopy chlorophyll content. Generally good correspondence was found between wavelength selections for TN and lignin (concentration and content) and overtones of fundamental C-H and N-H absorptance features. The AVIRIS data were not significantly correlated with either starch concentration or starch content, although wavelength selections for starch were consistent with those made in previous laboratory-based studies. RP JOHNSON, LF (reprint author), NASA,AMES RES CTR,JOHNSON CONTROLS WORLD SERV,MOFFETT FIELD,CA 94035, USA. NR 59 TC 99 Z9 115 U1 1 U2 13 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 1994 VL 47 IS 2 BP 216 EP 230 DI 10.1016/0034-4257(94)90157-0 PG 15 WC Environmental Sciences; Remote Sensing; Imaging Science & Photographic Technology SC Environmental Sciences & Ecology; Remote Sensing; Imaging Science & Photographic Technology GA NN406 UT WOS:A1994NN40600011 ER PT J AU LEVINE, ER KNOX, RG LAWRENCE, WT AF LEVINE, ER KNOX, RG LAWRENCE, WT TI RELATIONSHIPS BETWEEN SOIL PROPERTIES AND VEGETATION AT THE NORTHERN EXPERIMENTAL FOREST, HOWLAND, MAINE SO REMOTE SENSING OF ENVIRONMENT LA English DT Article ID SATELLITE DATA AB This research relates the results Of a survey and detailed analysis of soils in a northern mixed conifer forest to vegetation characteristics as represented by remotely sensed data. The work was conducted at International Paper's Northern Experimental Forest (NEF) at Howland, Maine as part of NASA's Forest Ecosystem Dynamics (FED) project. An intensive soil survey was performed and relationships between soil properties (i.e., drainage class, depth of active zone, water holding capacity, carbon/nitrogen ratio, pH, and sum of bases), species composition, and normalized difference vegetation index (NDVI) from the Advanced Visible and Infrared Imaging Spectrometer (AVIRIS) were derived. Results showed that there was great variability in soil properties across the landscape due to complex regional glacial activity and recent alluvial events. Significant statistical differences were observed in species composition and NDVI between soil mapping units and with soil drainage class. However, other specific soil properties could not be used to explain these differences given the number of soil samples characterized, or without taking disturbance and management history into account. Simulation modeling, which would include soil data and stand history information as inputs, would provide an additional means of interpreting the relationship between remotely sensed imagery, inferred ecosystem properties, and complex, landscape-level patterns of soil characteristics. C1 UNIV MARYLAND, DEPT GEOG, COLL PK, MD 20742 USA. RP NASA, GODDARD SPACE FLIGHT CTR, BIOSPHER SCI BRANCH, CODE 923, GREENBELT, MD 20771 USA. RI Knox, Robert/E-9657-2011 NR 36 TC 23 Z9 25 U1 0 U2 5 PU ELSEVIER SCIENCE INC PI NEW YORK PA 360 PARK AVE SOUTH, NEW YORK, NY 10010-1710 USA SN 0034-4257 EI 1879-0704 J9 REMOTE SENS ENVIRON JI Remote Sens. Environ. PD FEB PY 1994 VL 47 IS 2 BP 231 EP 241 DI 10.1016/0034-4257(94)90158-9 PG 11 WC Environmental Sciences; Remote Sensing; Imaging Science & Photographic Technology SC Environmental Sciences & Ecology; Remote Sensing; Imaging Science & Photographic Technology GA NN406 UT WOS:A1994NN40600012 ER PT J AU DEERING, DW MIDDLETON, EM ECK, TF AF DEERING, DW MIDDLETON, EM ECK, TF TI REFLECTANCE ANISOTROPY FOR A SPRUCE HEMLOCK FOREST CANOPY SO REMOTE SENSING OF ENVIRONMENT LA English DT Article ID PHOTOSYNTHETICALLY ACTIVE RADIATION; ATMOSPHERE-BIOSPHERE EXCHANGE; FACTOR DISTRIBUTIONS; VEGETATION INDEXES; CARBON-DIOXIDE; BOREAL FORESTS; TRANSPIRATION; ALBEDO; SURFACES; RADIOMETER AB The bidirectional reflectance distribution characteristics of a spruce-hemlock forest were studied during field campaigns conducted in August-September of two different years using the three-channel PARABOLA radiometer system and a SE590 spectrometer mounted for sampling above a forest canopy. Canopy bidirectional reflectance data were acquired under clear, cloudless sky conditions over a large range of solar zenith angles. Pyranometer measurements of the total hemispherical upwelling and downwelling solar radiation above and below the forest canopy were simultaneously acquired. In addition, the PARABOLA instrument was deployed at different heights within the canopy, under overcast sky conditions, to measure the directional downward spectral radiation transmitted. The highly absorbing forest canopy, with a total plant area index of 3.9, reflected only approximately 2.5% of the red (0.662 mum) hemispherical irradiance. Reflectances for wavebands in the photosynthetically active radiation (0.4-0.7 mum), the near-infrared (NIR, 0.826 mum), and the shortwave infrared (SWIR, 1.658 mum) were approximately 3%, 26%, and 15%, respectively. The bidirectional spectral reflectance factors in the solar principal plane were highly anisotropic, while those in the plane perpendicular to the solar principal plane were much closer to Lambertian. The forwardscatter was not much greater than the nadir reflectance, differing from the usual dense vegetative cover cases previously examined, especially for the NIR waveband. The hot spot maximum reflectance, occurring at the retrosolar view angle, was pronounced in all three wavebands. This prominent hot spot effect has not been observed for the NIR in other vegetation canopy types (e.g., grasslands, agricultural crops, and semiarid and desert scrub). View angle effects were more prominent than solar zenith angle effects, except at large solar zenith angles. Hemispherical spectral reflectance factors and albedo increased with increases in solar zenith angle. Substantial variation was observed in the normalized difference vegetation index (NDVI) for different view and solar zenith angles with a nominal value of 0.75. C1 HUGHES STX CORP,LANHAM,MD. RP DEERING, DW (reprint author), NASA,GODDARD SPACE FLIGHT CTR,CODE 923,GREENBELT,MD 20771, USA. RI ECK, THOMAS/D-7407-2012 NR 54 TC 55 Z9 59 U1 0 U2 10 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 1994 VL 47 IS 2 BP 242 EP 260 DI 10.1016/0034-4257(94)90159-7 PG 19 WC Environmental Sciences; Remote Sensing; Imaging Science & Photographic Technology SC Environmental Sciences & Ecology; Remote Sensing; Imaging Science & Photographic Technology GA NN406 UT WOS:A1994NN40600013 ER PT J AU RANSON, KJ IRONS, JR WILLIAMS, DL AF RANSON, KJ IRONS, JR WILLIAMS, DL TI MULTISPECTRAL BIDIRECTIONAL REFLECTANCE OF NORTHERN FOREST CANOPIES WITH THE ADVANCED SOLID-STATE ARRAY SPECTRORADIOMETER (ASAS) SO REMOTE SENSING OF ENVIRONMENT LA English DT Article ID IMAGING SPECTRORADIOMETER; VEGETATED SURFACES; ALBEDO; SENSOR; NADIR; DISTRIBUTIONS; SATELLITE; FIELD; VIEW AB Understanding the bidirectional reflectance characteristics of forest canopies is important for relating remote sensing observations to biomass, species, stand structure, and albedo. studies of the directional scattering of forest canopies have been limited in the past because of difficulties in suspending instruments over tall canopies or by being restricted to airborne scanning systems. In this article we discuss the use of the Advanced Solid-State Array Spectroradiometer (ASAS) to measure the bidirectional reflectance of several diverse forest canopies. ASAS data were acquired in 1989 and 1990 as part Of an extensive field measurement campaign at International Paper's Northern Experimental Forest (NEF) located near Howland, Maine. Multiangle data sets were acquired for several sites under clear sky conditions and at view azimuths parallel, oblique, and perpendicular to the principal plane of the sun. The sensor radiance data for several surface types including forest stands and openings were converted to bidirectional reflectance using an atmospheric correction algorithm and optical thickness measurements. In addition, photosynthetically active radiation (PAR) hemispherical reflectance (albedo) was calculated from the corrected ASAS data and compared to a vegetation index. Highest observed reflectance factors were recorded in or near the solar principal plane at viewing geometries approaching the antisolar direction. Minimum reflectances were also observed in the solar principal plane, but in the forward scattered direction. Bidirectional reflectance factors (BRFs) acquired in the backscatter direction at visible wavelengths showed larger percent differences between viewing angles of 45-degrees in the forward and backscattered direction (up to 95%) than near-IR data (up to 60%). The normalized vegetation index (NDVI) also varied with view angle but to a lesser degree than single-band BRFs. Also in contrast to single-band BRFs, maximum NDVI was recorded in the forward scattered direction and minimum NDVI was observed in the backscattered direction. Estimated fraction of absorbed photosynthetically active radiation F(APAR) was determined from the hemispherical PAR reflectance for several canopy types within the forest area. Examining the relationships with NDVI revealed a strong dependence of NDVI on F(APAR) for nadir and 450 forward scattered data. A poor relationship was observed for data acquired at 45-degrees in the backscattered direction and for NDVI derived from hemispherical reflectance. From these results, it is apparent that the sensor viewing geometry that minimizes the contribution of reflectance from branches and the ground will yield higher relationships between F(APAR) and NDVI. RP RANSON, KJ (reprint author), NASA,GODDARD SPACE FLIGHT CTR,TERR PHYS LAB,CODE 923,GREENBELT,MD 20771, USA. RI Irons, James/D-8535-2012; Ranson, Kenneth/G-2446-2012 OI Ranson, Kenneth/0000-0003-3806-7270 NR 36 TC 42 Z9 43 U1 0 U2 2 PU ELSEVIER SCIENCE INC PI NEW YORK PA 655 AVENUE OF THE AMERICAS, NEW YORK, NY 10010 SN 0034-4257 J9 REMOTE SENS ENVIRON JI Remote Sens. Environ. PD FEB PY 1994 VL 47 IS 2 BP 276 EP 289 DI 10.1016/0034-4257(94)90161-9 PG 14 WC Environmental Sciences; Remote Sensing; Imaging Science & Photographic Technology SC Environmental Sciences & Ecology; Remote Sensing; Imaging Science & Photographic Technology GA NN406 UT WOS:A1994NN40600015 ER PT J AU KEENAN, FP THOMAS, RJ NEUPERT, WM CONLON, ES AF KEENAN, FP THOMAS, RJ NEUPERT, WM CONLON, ES TI MG IX EMISSION-LINES IN AN ACTIVE-REGION SPECTRUM OBTAINED WITH THE SOLAR EUV ROCKET TELESCOPE AND SPECTROGRAPH (SERTS) SO SOLAR PHYSICS LA English DT Article ID SUN; RATIOS AB Theoretical electron-temperature-sensitive Mg IX emission line ratios are presented for R1 = I(443.96 angstrom)/I(368.06 angstrom), R2 = I(439.17 angstrom)/I(368.06 angstrom), R3 = I(443.37 angstrom)/I(368.06 angstrom), R4 = I(441.22 angstrom)/I(368.06 angstrom), and R5 = I(448.28 angstrom)/I(368.06 angstrom). A comparison of these with observational data for a solar active region, obtained during a rocket flight by the Solar EUV Rocket Telescope and Spectrograph (SERTS), reveals excellent agreement between theory and observation for R1 through R4, with discrepancies that average only 9%. This provides experimental support for the accuracy of the atomic data adopted in the line ratio calculations, and also resolves discrepancies found previously when the theoretical results were compared with solar data from the S082A instrument on board Skylab. However in the case of R5, the theoretical and observed ratios differ by almost a factor of 2. This may be due to the measured intensity of the 448.28 angstrom line being seriously affected by instrumental effects, as it lies very close to the long wavelength edge of the SERTS spectral coverage (235.46-448.76 angstrom). C1 NASA,GODDARD SPACE FLIGHT CTR,ASTRON & SOLAR PHYS LAB,GREENBELT,MD 20771. RP KEENAN, FP (reprint author), QUEENS UNIV BELFAST,DEPT PURE & APPL PHYS,BELFAST BT7 1NN,ANTRIM,NORTH IRELAND. NR 16 TC 7 Z9 7 U1 0 U2 0 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 1994 VL 149 IS 2 BP 301 EP 308 DI 10.1007/BF00690618 PG 8 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA MX569 UT WOS:A1994MX56900009 ER PT J AU POLYGIANNAKIS, JM MOUSSAS, X QUENBY, JJ SMITH, EJ AF POLYGIANNAKIS, JM MOUSSAS, X QUENBY, JJ SMITH, EJ TI SPECTRAL POLARIZATION ANALYSIS OF THE INTERPLANETARY MAGNETIC-FIELD FLUCTUATIONS SO SOLAR PHYSICS LA English DT Article ID WAVES AB A new computational method and algorithm, based on complex Fourier analysis, is used to derive the spectral density of plane and circularly polarized fluctuation components of the interplanetary magnetic field. Applications of the method have been made using HEOS 2 (1 AU), Pioneer 10 (5 AU), Pioneer 11 (20 AU), and ICE (Giocabini-Zinner's comet) data sets. The results show the existence of circularly polarized MHD waves in all cases. C1 UNIV LONDON IMPERIAL COLL SCI TECHNOL & MED,BLACKETT LAB,LONDON SW7 2BZ,ENGLAND. JET PROP LAB,PASADENA,CA 91109. RP POLYGIANNAKIS, JM (reprint author), NATL UNIV ATHENS,DEPT PHYS,GR-15783 ATHENS,GREECE. NR 16 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 0038-0938 J9 SOL PHYS JI Sol. Phys. PD FEB PY 1994 VL 149 IS 2 BP 381 EP 389 DI 10.1007/BF00690623 PG 9 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA MX569 UT WOS:A1994MX56900014 ER PT J AU WILSON, RM AF WILSON, RM TI A COMMENT ON THE SUSPECTED SOLAR-NEUTRINO SOLAR-ACTIVITY CONNECTION SO SOLAR PHYSICS LA English DT Article ID PARTICLES AB Recently, it has been proposed that there exists a highly statistically significant (at greater-than-or-equal-to 98% level of confidence) relationship between Ar-37 production rate (viz., solar neutrinos) and the Ap geomagnetic index (viz., solar particles), based on the chi-square goodness-of-fit test and correlation analysis, for the interval 1970-1990. While a relationship between the two parameters, indeed, seems to be discernible, the strength of the relationship has been overstated. Instead of being significant at the afore-mentioned level of confidence, the relationship is found to be significant at only greater-than-or-equal-to 95% level of confidence, based on Yates' modification to the chi-square test for 2 x 2 contingency tables. Likewise, while correlation analysis yields a value of r = 0.2691, it is important to note that such a value suggests that only about 7% of the variance can be 'explained' by the inferred correlation and that the remaining 93% of the variance must be attributed to other sources. RP WILSON, RM (reprint author), NASA,GEORGE C MARSHALL SPACE FLIGHT CTR,SPACE SCI LAB,ES52,HUNTSVILLE,AL 35812, USA. NR 7 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 0038-0938 J9 SOL PHYS JI Sol. Phys. PD FEB PY 1994 VL 149 IS 2 BP 391 EP 394 DI 10.1007/BF00690624 PG 4 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA MX569 UT WOS:A1994MX56900015 ER PT J AU RUZMAIKIN, A FEYNMAN, J ROBINSON, P AF RUZMAIKIN, A FEYNMAN, J ROBINSON, P TI LONG-TERM PERSISTENCE OF SOLAR-ACTIVITY SO SOLAR PHYSICS LA English DT Article ID MAUNDER MINIMUM AB We examine the question of whether or not the non-periodic variations in solar activity are caused by a white-noise, random process. The Hurst exponent, which characterizes the persistence of a time series, is evaluated for the series of C-14 data for the time interval from about 6000 BC to 1950 AD. We find a constant Hurst exponent, suggesting that solar activity in the frequency range from 100 to 3000 years includes an important continuum component in addition to the well-known periodic variations. The value we calculate, H almost-equal-to 0.8, is significantly larger than the value of 0.5 that would correspond to variations produced by a white-noise process. This value is in good agreement with the results for the monthly sunspot data reported elsewhere, indicating that the physics that produces the continuum is a correlated random process and that it is the same type of process over a wide range of time interval lengths. C1 JET PROP LAB,PASADENA,CA 91109. RP RUZMAIKIN, A (reprint author), CALIF STATE UNIV NORTHRIDGE,DEPT PHYS & ASTRON,NORTHRIDGE,CA 91330, USA. NR 12 TC 41 Z9 41 U1 0 U2 0 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 1994 VL 149 IS 2 BP 395 EP 403 DI 10.1007/BF00690625 PG 9 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA MX569 UT WOS:A1994MX56900016 ER PT J AU FAUR, M FAUR, M JAYNE, DT BAILEY, S GORADIA, M AF FAUR, M FAUR, M JAYNE, DT BAILEY, S GORADIA, M TI ETCHANT FOR CHEMICAL THINNING OF INP AND ITS APPLICATION IN THE FABRICATION OF INP DIFFUSED JUNCTION SOLAR-CELLS SO SURFACE AND INTERFACE ANALYSIS LA English DT Article AB A new etchant, which we have called 'PNP', with the composition (o-H3PO4)u:(HNO3)v:(H2O2)t: (H2O)100-(u+v+t) has been developed for thinning, after contacting, the n+ and p+ emitter layer of n+p and p+n InP structures made by thermal diffusion. By varying u, v and t, reproducible etch rates of 5-110 nm min-1 have been obtained. After thinning the 2.5-4.5 mum thick p+ InP layer down to 60-250 nm, specular surfaces have been obtained at up to 80 nm min-1 etch rates. Owing to its intrinsic qualities, the residual phosphorus-rich oxide after thinning the emitter layer provides surface passivation of p+ InP surfaces and can also serve as a first-layer antireflective coating. Very high quality p+n InP structures were also obtained using a thin (30-40 angstrom thick) phosphorus-rich chemical oxide, grown using this etchant as a diffusion cap layer. C1 NASA, LEWIS RES CTR, CLEVELAND, OH 44135 USA. CASE WESTERN RESERVE UNIV, CLEVELAND, OH 44106 USA. RP FAUR, M (reprint author), CLEVELAND STATE UNIV, DEPT ELECT ENGN, SPACE PHOTOVOLTA RES CTR, 1983 E 24TH ST, CLEVELAND, OH 44115 USA. NR 12 TC 0 Z9 0 U1 0 U2 1 PU WILEY-BLACKWELL PI HOBOKEN PA 111 RIVER ST, HOBOKEN 07030-5774, NJ USA SN 0142-2421 EI 1096-9918 J9 SURF INTERFACE ANAL JI Surf. Interface Anal. PD FEB PY 1994 VL 21 IS 2 BP 110 EP 116 DI 10.1002/sia.740210208 PG 7 WC Chemistry, Physical SC Chemistry GA NE527 UT WOS:A1994NE52700007 ER PT J AU MEARINI, GT KRAINSKY, IL DAYTON, JA AF MEARINI, GT KRAINSKY, IL DAYTON, JA TI INVESTIGATION OF DIAMOND FILMS FOR ELECTRONIC DEVICES SO SURFACE AND INTERFACE ANALYSIS LA English DT Article; Proceedings Paper CT 15th Symposium on Applied Surface Analysis CY JUN 09-11, 1993 CL CASE WESTERN RESERVE UNIV, CLEVELAND, OH SP AMER VACUUM SOC, APPL SURFACE SCI DIV HO CASE WESTERN RESERVE UNIV ID AFFINITY; SURFACE AB Direct dependence of secondary electron emission (SEE) from diamond films due to surface hydrogen has been observed. High secondary yields (14-27) have been achieved in polycrystalline diamond films on molybdenum substrates by varying the hydrogen content on the surface. This was accomplished by driving hydrogen from the bulk by heating the sample, or by adsorption of hydrogen onto the surface from direct hydrogen exposure. However, exposure to an electron beam depleted the surface of hydrogen as a function of current dosage in the energy range 300 eV-3 keV, thereby reducing the secondary yield to a value as low as 3. Recovery of the secondary yield in the as-deposited samples was facilitated by saturating the surface with hydrogen, as mentioned, and the recovery time has been characterized. The partial pressure of hydrogen could be adjusted so that the high secondary yield remained stable during beam exposure. The unique properties of these diamond films make them potentially useful as secondary emitters in electronic component designs. A special sample-older assembly has been constructed to test the feasibility of using these polycrystalline diamond films as dynodes in an electron amplifier. Actual gain at a hydrogen partial pressure of 1.0 x 10-T Torr was measured to be 2.4 x 10(4). The maximum gain expected was 2.4 x 10(5). C1 NASA,LEWIS RES CTR,21000 BROOKPARK RD,CLEVELAND,OH 44135. NR 7 TC 26 Z9 26 U1 0 U2 3 PU JOHN WILEY & SONS LTD PI W SUSSEX PA BAFFINS LANE CHICHESTER, W SUSSEX, ENGLAND PO19 1UD SN 0142-2421 J9 SURF INTERFACE ANAL JI Surf. Interface Anal. PD FEB PY 1994 VL 21 IS 2 BP 138 EP 143 DI 10.1002/sia.740210212 PG 6 WC Chemistry, Physical SC Chemistry GA NE527 UT WOS:A1994NE52700011 ER PT J AU LAMOURI, A KRAINSKY, IL MULLER, W AF LAMOURI, A KRAINSKY, IL MULLER, W TI ELECTRONIC-STRUCTURE AND WORK FUNCTION STUDY OF A MODEL DISPENSER CATHODE SURFACE SO SURFACE AND INTERFACE ANALYSIS LA English DT Article; Proceedings Paper CT 15th Symposium on Applied Surface Analysis CY JUN 09-11, 1993 CL CASE WESTERN RESERVE UNIV, CLEVELAND, OH SP AMER VACUUM SOC, APPL SURFACE SCI DIV HO CASE WESTERN RESERVE UNIV ID RESOLVED INVERSE PHOTOEMISSION; IMPREGNATED CATHODES; BA; W(001); W(100); ADSORPTION; OXIDATION; MONOLAYER; TUNGSTEN; OXYGEN AB We have used work function measurements (DELTAphi), Auger electron spectroscopy, low-energy electron diffraction and angle-resolved inverse photoelectron spectroscopy to study the coadsorption of barium and oxygen on tungsten. The experimental two-dimensional band structure was compared with results of embedded cluster model calculations for a c(2 x 2) BaO monolayer on W(001) with barium and oxygen placed on alternate fourfold-hollow sites. Our work function measurements revealed that adsorption of one monolayer of BaO decreased the work function of W(001) (phi = 4.63 eV) to approximately 2.3-2.4 eV regardless of the order of barium and oxygen adsorption on the surface. Inverse photoelectron spectroscopy in the isochromat mode was used to investigate the unoccupied electronic energy levels of one monolayer of BaO on W(001) along two high-symmetry directions of the W(001) surface Brillouin zone. Non-dispersing spectral features were observed at 0.6 eV and 3.4 eV above the Fermi level (E(F)) and were assigned to transitions into both barium and tungsten d states in good agreement with calculated densities of states. C1 NASA,LERC,21000 BROOKPARK RD,CLEVELAND,OH 44135. ANALATOM INC,WESTLAKE,OH 44145. NR 29 TC 3 Z9 3 U1 0 U2 2 PU JOHN WILEY & SONS LTD PI W SUSSEX PA BAFFINS LANE CHICHESTER, W SUSSEX, ENGLAND PO19 1UD SN 0142-2421 J9 SURF INTERFACE ANAL JI Surf. Interface Anal. PD FEB PY 1994 VL 21 IS 2 BP 150 EP 154 DI 10.1002/sia.740210214 PG 5 WC Chemistry, Physical SC Chemistry GA NE527 UT WOS:A1994NE52700013 ER PT J AU VANDEGRIEND, AA OWE, M AF VANDEGRIEND, AA OWE, M TI BARE SOIL SURFACE-RESISTANCE TO EVAPORATION BY VAPOR DIFFUSION UNDER SEMIARID CONDITIONS SO WATER RESOURCES RESEARCH LA English DT Article ID MESOBETA-SCALE MODEL; BOUNDARY-LAYER MODEL; PARAMETERIZATION; MOISTURE; WATER; TRANSPIRATION; SIMULATION AB Based on Kohsiek's fast air circulation chamber, a method has been developed to measure the surface resistance to vapor diffusion in a drying topsoil. This resistance is important to estimate evaporation from bare soils using an aerodynamic resistance formulation. Measurements were done for a fine sandy loam during a dry down after artificial wetting. Surface resistance started to increase at a moisture content of 15% by volume in the l-cm top layer, which is 50% of its moisture content at field capacity. Calculations of the aerodynamic resistance were corrected for stability and were used to isolate the real surface resistance from the bulk resistance. Resistances could be modeled as a function of the top 1 cm soil moisture and varied between approximately 10 s/m for a wet and several thousand seconds per meter for a dry top layer. The measurements demonstrated a very pronounced diurnal course due to drying of the very top layer during the day and recovery of the moisture profile during nighttime hours. C1 NASA,GODDARD SPACE FLIGHT CTR,HYDROL SCI BRANCH,GREENBELT,MD 20771. RP VANDEGRIEND, AA (reprint author), FREE UNIV AMSTERDAM,INST EARTH SCI,AMSTERDAM,NETHERLANDS. NR 39 TC 119 Z9 121 U1 2 U2 21 PU AMER GEOPHYSICAL UNION PI WASHINGTON PA 2000 FLORIDA AVE NW, WASHINGTON, DC 20009 SN 0043-1397 J9 WATER RESOUR RES JI Water Resour. Res. PD FEB PY 1994 VL 30 IS 2 BP 181 EP 188 DI 10.1029/93WR02747 PG 8 WC Environmental Sciences; Limnology; Water Resources SC Environmental Sciences & Ecology; Marine & Freshwater Biology; Water Resources GA MV707 UT WOS:A1994MV70700005 ER PT J AU VASQUEZ, RP AF VASQUEZ, RP TI INTRINSIC PHOTOEMISSION SIGNALS, SURFACE PREPARATION, AND SURFACE STABILITY OF HIGH-TEMPERATURE SUPERCONDUCTORS SO JOURNAL OF ELECTRON SPECTROSCOPY AND RELATED PHENOMENA LA English DT Article ID RAY PHOTOELECTRON-SPECTROSCOPY; ANGLE-RESOLVED PHOTOEMISSION; HIGH-TC SUPERCONDUCTOR; EXPERIMENTAL ELECTRONIC-STRUCTURE; CA-CU-O; CORE-LEVEL; SINGLE-CRYSTALS; VALENCE-BAND; THIN-FILMS; OXIDE SUPERCONDUCTORS AB Photoemission signals which are characteristic of high quality surfaces of high temperature superconductors are briefly reviewed. Criteria for assessing surface quality are determined, and these criteria are then used to evaluate the various surface preparation procedures reported in the literature. It will be shown that some widely used procedures effectively clean surfaces of some materials, but damage other materials. For example, surfaces of YBa2Cu3O7-delta and Nd1.85Ce0.15CuO4-delta scraped in vacuum show clear signs of damage, such as loss of intensity at the Fermi edge, and in the case of YBa2Cu3O7-delta the spectral features are consistent with loss of oxygen resulting from the ''cleaning'' procedure. Finally, the stability of clean high temperature superconductor surfaces is discussed. RP VASQUEZ, RP (reprint author), JET PROP LAB,CTR SPACE MICROELECTR TECHNOL,PASADENA,CA 91109, USA. NR 72 TC 37 Z9 37 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0368-2048 J9 J ELECTRON SPECTROSC JI J. Electron Spectrosc. Relat. Phenom. PD JAN 28 PY 1994 VL 66 IS 3-4 BP 209 EP 222 DI 10.1016/0368-2048(93)01850-E PG 14 WC Spectroscopy SC Spectroscopy GA MX843 UT WOS:A1994MX84300002 ER PT J AU VASQUEZ, RP AF VASQUEZ, RP TI ALKALINE-EARTH CORE-LEVEL PHOTOEMISSION SPECTROSCOPY OF HIGH-TEMPERATURE SUPERCONDUCTORS SO JOURNAL OF ELECTRON SPECTROSCOPY AND RELATED PHENOMENA LA English DT Article ID X-RAY PHOTOELECTRON; HIGH-TC SUPERCONDUCTOR; ANGLE-RESOLVED PHOTOEMISSION; ENERGY-BAND STRUCTURE; CA-CU-O; ELECTRONIC-STRUCTURE; INVERSE-PHOTOEMISSION; SINGLE-CRYSTALS; BINDING-ENERGIES; CUPRATE SUPERCONDUCTORS AB Photoemission measurements of the alkaline earth core levels of high temperature superconductors and related materials are reviewed. Models which seek to explain the large negative chemical shifts observed relative to the corresponding alkaline earth metals are discussed and critically examined. The effect of lattice site disorder on the core level spectra and the presence or absence of intrinsic surface peaks are also reviewed. RP VASQUEZ, RP (reprint author), JET PROP LAB,CTR SPACE MICROELECTR TECHNOL,PASADENA,CA 91109, USA. NR 95 TC 18 Z9 18 U1 0 U2 0 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0368-2048 J9 J ELECTRON SPECTROSC JI J. Electron Spectrosc. Relat. Phenom. PD JAN 28 PY 1994 VL 66 IS 3-4 BP 241 EP 255 DI 10.1016/0368-2048(93)01856-A PG 15 WC Spectroscopy SC Spectroscopy GA MX843 UT WOS:A1994MX84300004 ER PT J AU CHARLES, CD RIND, D JOUZEL, J KOSTER, RD FAIRBANKS, RG AF CHARLES, CD RIND, D JOUZEL, J KOSTER, RD FAIRBANKS, RG TI GLACIAL-INTERGLACIAL CHANGES IN MOISTURE SOURCES FOR GREENLAND - INFLUENCES ON THE ICE CORE RECORD OF CLIMATE SO SCIENCE LA English DT Article ID GENERAL-CIRCULATION MODEL; PRECIPITATION; SIMULATIONS; TIMESCALE; EVENT; HDO; GCM AB Large, abrupt shifts in the O-18/O-16 ratio found in Greenland ice must reflect real features of the climate system variability. These isotopic shifts can be viewed as a result of air temperature fluctuations, but determination of the cause of the changes-the most crucial issue for future climate concerns-requires a detailed understanding of the controls on isotopes in precipitation. Results from general circulation model experiments suggest that the sources of Greenland precipitation varied with different climate states, allowing dynamic atmospheric mechanisms for influencing the ice core isotope shifts. C1 GODDARD INST SPACE STUDIES, NEW YORK, NY 10028 USA. CEA, DSM, CE SACLAY, MODELISAT CLIMAT & ENVIRONNEMENT LAB, F-91191 GIF SUR YVETTE, FRANCE. CNRS, GLACIOL & GEOPHYS ENVIRONNEMENT LAB, F-38402 ST MARTIN DHERES, FRANCE. NASA, GODDARD SPACE FLIGHT CTR, HYDROL SCI BRANCH, GREENBELT, MD 20904 USA. COLUMBIA UNIV, LAMONT DOHERTY GEOL OBSERV, PALISADES, NY 10964 USA. COLUMBIA UNIV, DEPT GEOL SCI, NEW YORK, NY 10025 USA. RP CHARLES, CD (reprint author), UNIV CALIF SAN DIEGO, SCRIPPS INST OCEANOG, LA JOLLA, CA 92093 USA. RI Koster, Randal/F-5881-2012 OI Koster, Randal/0000-0001-6418-6383 NR 34 TC 149 Z9 150 U1 0 U2 18 PU AMER ASSOC ADVANCEMENT SCIENCE PI WASHINGTON PA 1200 NEW YORK AVE, NW, WASHINGTON, DC 20005 USA SN 0036-8075 J9 SCIENCE JI Science PD JAN 28 PY 1994 VL 263 IS 5146 BP 508 EP 511 DI 10.1126/science.263.5146.508 PG 4 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA MT966 UT WOS:A1994MT96600029 PM 17754884 ER PT J AU MARDER, SR CHENG, LT TIEMANN, BG FRIEDLI, AC BLANCHARDDESCE, M PERRY, JW SKINDHOJ, J AF MARDER, SR CHENG, LT TIEMANN, BG FRIEDLI, AC BLANCHARDDESCE, M PERRY, JW SKINDHOJ, J TI LARGE 1ST HYPERPOLARIZABILITIES IN PUSH-PULL POLYENES BY TUNING OF THE BOND-LENGTH ALTERNATION AND AROMATICITY SO SCIENCE LA English DT Article ID 2ND HARMONIC-GENERATION; OPTICAL SUSCEPTIBILITIES; CRYSTAL-STRUCTURE; POLARIZABILITIES; NONLINEARITIES; DERIVATIVES; MOLECULES; STATE AB Conjugated organic compounds with 3-phenyl-5-isoxazolone or N,N'-diethylthiobarbituric acid acceptors have large first molecular hyperpolarizabilities (beta) in comparison with compounds with 4-nitrophenyl acceptors. For example, julolidinyl-(CH=CH)3-CH=N,N'-diethylthiobarbituric acid, which has 12 atoms between the donor and acceptor, has a beta(0) of 911 X 10(-30) electrostatic units, whereas (CH3)2NC6H4-(CH=CH)4-C6H4NO2, with 16 atoms between its donor and acceptor, has a beta(0) of 133 x 10(-30) electrostatic units. The design strategies demonstrated here have resulted in chromophores that when incorporated into poled-polymer electrooptic modulators exhibited significant enhancements in electrooptic coefficients relative to polymers containing the commonly used dye Disperse Red-1. Poled polymer devices based on these or related chromophores may ultimately lead to high-speed electrooptic switching elements with low drive-power requirements, suitable for telecommunications applications. C1 CALTECH,BECKMAN INST,PASADENA,CA 91125. DUPONT CO INC,DEPT CENT RES & DEV,WILMINGTON,DE 19880. COLL FRANCE,F-75231 PARIS 05,FRANCE. RP MARDER, SR (reprint author), JET PROP LAB,PASADENA,CA 91109, USA. RI Perry, Joseph/B-7191-2011 OI Perry, Joseph/0000-0003-1101-7337 NR 24 TC 520 Z9 529 U1 13 U2 77 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 28 PY 1994 VL 263 IS 5146 BP 511 EP 514 DI 10.1126/science.263.5146.511 PG 4 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA MT966 UT WOS:A1994MT96600030 PM 17754885 ER PT J AU MIELKE, SL TRUHLAR, DG SCHWENKE, DW AF MIELKE, SL TRUHLAR, DG SCHWENKE, DW TI COMPARISON OF THEORETICAL AND EXPERIMENTAL DIFFERENTIAL CROSS-SECTIONS FOR THE H+D-2 REACTION SO JOURNAL OF PHYSICAL CHEMISTRY LA English DT Letter ID QUANTUM-STATE DISTRIBUTIONS; WAVE VARIATIONAL PRINCIPLE; POTENTIAL-ENERGY SURFACE; BASIS-SET CALCULATIONS; COLLISION ENERGY; SCATTERING CALCULATIONS; TRAJECTORY CALCULATIONS; REACTION H+D2->HD+D; FOURIER-SERIES; DYNAMICS AB We present accurate quantum mechanical differential cross sections for the H + D-2 reaction. Results are given for two potential energy surfaces and three initial states at relative translational energies of E(rel) = 0.525-0.562 eV. Comparisons are made to quasiclassical trajectory simulations and experiments. The average final rotational quantum number is 12% less than the quasiclassical one, and the quantal and classical differential cross sections have qualitatively different shapes. The theoretical differential cross sections show less forward scattering than experiment. C1 UNIV MINNESOTA,DEPT CHEM,CHEM PHYS PROGRAM,MINNEAPOLIS,MN 55455. UNIV MINNESOTA,INST SUPERCOMP,MINNEAPOLIS,MN 55455. NASA,AMES RES CTR,MOFFETT FIELD,CA 94035. RI Mielke, Steven/B-7533-2008; schwenke, david/I-3564-2013; Truhlar, Donald/G-7076-2015 OI Mielke, Steven/0000-0002-1938-7503; Truhlar, Donald/0000-0002-7742-7294 NR 69 TC 29 Z9 29 U1 0 U2 1 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0022-3654 J9 J PHYS CHEM-US JI J. Phys. Chem. PD JAN 27 PY 1994 VL 98 IS 4 BP 1053 EP 1057 DI 10.1021/j100055a002 PG 5 WC Chemistry, Physical SC Chemistry GA MU060 UT WOS:A1994MU06000002 ER PT J AU BOGAN, DJ NESBITT, FL AF BOGAN, DJ NESBITT, FL TI ETHOXY RADICAL YIELD IN THE SYSTEM C2D5OH PLUS F(P-2) PLUS F2 AT P=1 TORR AND T=223-423 K SO JOURNAL OF PHYSICAL CHEMISTRY LA English DT Article ID INFRARED CHEMI-LUMINESCENCE; FLUORINE+METHANOL REACTION; TEMPERATURE-DEPENDENCE; DEUTERATED ANALOGS; BRANCHING RATIO; FLUORINE-ATOMS; ETHANOL; CH3OH; HF AB A discharge flow reactor with mass spectrometric detection has been used to determine the fractional yield of ethoxy, Y(EtO), from the reaction of F(P-2) with C2D5OH. The chemical titration method that was used depends only upon the occurrence of the fast chain reaction, F-2 + C2D4OH --> C2D4OH + F, and the ability to measure relative concentrations of ethoxy radical. Ethoxy concentration was proportional to the detected ion count signal at m/z 50. [Ethoxy] was titrated to an asymptote with a large excess of F-2. The titration removes hydroxyethyl radicals and regenerates F so that, at the asymptote, each F initially present will have formed one ethoxy radical. The experimental value of Y(EtO) is the ratio of the m/z 50 signal in the absence of F-2 to the signal in the presence of F-2. The measured values of Y(EtO) +/- (1 sigma) are 0.62 +/- 0.08 at 223 K, 0.55 +/- 0.06 at 300 K, and 0.39 +/- 0.02 at 423 K. An Arrhenius analysis of these data implies that the average activation energy for abstraction at a C-D bond is about 1 kcal/mol larger than that for abstraction at the O-H bond. The activation energy for attack at O-H is likely to be near zero. Allowing F(P-2) to react with large excesses of ethanol and F-2 provides a good clean source of ethoxy radical. C1 CATHOLIC UNIV AMER,DEPT CHEM,WASHINGTON,DC 20064. COPPIN STATE COLL,DEPT NAT SCI,BALTIMORE,MD 21216. RP BOGAN, DJ (reprint author), NASA,GODDARD SPACE FLIGHT CTR,EXTRATERR PHYS LAB,CODE 691,GREENBELT,MD 20771, USA. NR 22 TC 5 Z9 5 U1 0 U2 1 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0022-3654 J9 J PHYS CHEM-US JI J. Phys. Chem. PD JAN 27 PY 1994 VL 98 IS 4 BP 1151 EP 1155 DI 10.1021/j100055a018 PG 5 WC Chemistry, Physical SC Chemistry GA MU060 UT WOS:A1994MU06000018 ER PT J AU BROWN, RH KIRK, RL AF BROWN, RH KIRK, RL TI COUPLING OF VOLATILE TRANSPORT AND INTERNAL HEAT-FLOW ON TRITON SO JOURNAL OF GEOPHYSICAL RESEARCH-PLANETS LA English DT Article ID GEYSER-LIKE PLUMES; ATMOSPHERE; NITROGEN; NEPTUNE; FROST; STABILITY; SURFACE; MODEL; CYCLE AB Recently Brown et al. (1991) showed that Triton's internal heat source could amount to 5-20% of the absorbed insolation on Triton, thus significantly affecting volatile transport and atmospheric pressure. Subsequently, Kirk and Brown (1991a) used simple analytical models of the effect of internal heat on the distribution of volatiles on Triton's surface, confirming the speculation of Brown et al. that Triton's internal heat flow could strongly couple to the surface volatile distribution. To further explore this idea, we present numerical models of the permanent distribution of nitrogen ice on Triton that include the effects of sunlight, the two-dimensional distribution of internal heat flow, the coupling of internal heat flow to the surface distribution of nitrogen ice, and the finite viscosity of nitrogen ice. From these models we conclude that: (1) The strong vertical thermal gradient induced in Triton's polar caps by internal heat-flow facilitates viscous spreading to lower latitudes, thus opposing the poleward transport of volatiles by sunlight, and, for plausible viscosities and nitrogen inventories, producing permanent caps of considerable latitudinal extent; (2) It is probable that there is a strong coupling between the surface distribution of nitrogen ice on Triton and internal heat flow; (3) Asymmetries in the spatial distribution of Triton's heat flow, possibly driven by large-scale, volcanic activity or convection in Triton's interior, can result in permanent polar caps of unequal latitudinal extent, including the case of only one permanent polar cap; (4) Melting at the base of a permanent polar cap on Triton caused by internal heat flow can significantly enhance viscous spreading, and, as an alternative to the solid-state greenhouse mechanism proposed by Brown et al. (1990), could provide the necessary energy, fluids, and/or gases to drive Triton's geyser-like plumes; (5) The atmospheric collapse predicted to occur on Triton in the next 20 years (Spencer, 1990) may be plausibly avoided because of the large latitudinal extent expected for permanent polar caps on Triton. C1 US GEOL SURVEY,ASTROGEOL BRANCH,FLAGSTAFF,AZ 86001. RP BROWN, RH (reprint author), CALTECH,JET PROP LAB,4800 OAK GROVE DR,PASADENA,CA 91109, USA. NR 43 TC 19 Z9 19 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-PLANET JI J. Geophys. Res.-Planets PD JAN 25 PY 1994 VL 99 IS E1 BP 1965 EP 1981 DI 10.1029/93JE02618 PG 17 WC Geochemistry & Geophysics SC Geochemistry & Geophysics GA MT783 UT WOS:A1994MT78300001 ER PT J AU DEISSLER, RJ BRAND, HR AF DEISSLER, RJ BRAND, HR TI PERIODIC, QUASI-PERIODIC, AND CHAOTIC LOCALIZED SOLUTIONS OF THE QUINTIC COMPLEX GINZBURG-LANDAU EQUATION SO PHYSICAL REVIEW LETTERS LA English DT Article ID WEAKLY INVERTED BIFURCATION; BINARY-FLUID CONVECTION; SYSTEMS; FLOW; TRANSITION; PATTERNS; STATES; FRONTS; ORIGIN; WAVES AB We discuss time-dependent spatially localized solutions of the quintic complex Ginzburg-Landau equation applicable near a weakly inverted bifurcation to traveling waves. We find that there are-in addition to the stationary pulses reported previously-stable localized solutions that are periodic, quasiperiodic, or even chaotic in time. An intuitive picture for the stability of thee time-dependent localized solutions is presented and the novelty of these phenomena in comparison to localized solutions arising for exactly integrable systems is emphasized. C1 NASA,LEWIS RES CTR,OHIO AEROSP INST,INST COMPUTAT MECH PROPULS,CLEVELAND,OH 44135. UNIV BAYREUTH,D-95440 BAYREUTH,GERMANY. RP DEISSLER, RJ (reprint author), LOS ALAMOS NATL LAB,CTR NONLINEAR STUDIES,MS-B 258,LOS ALAMOS,NM 87545, USA. NR 26 TC 122 Z9 124 U1 0 U2 4 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0031-9007 J9 PHYS REV LETT JI Phys. Rev. Lett. PD JAN 24 PY 1994 VL 72 IS 4 BP 478 EP 481 DI 10.1103/PhysRevLett.72.478 PG 4 WC Physics, Multidisciplinary SC Physics GA MR976 UT WOS:A1994MR97600011 ER PT J AU GREELEY, R SCHUBERT, G LIMONADI, D BENDER, KC NEWMAN, WI THOMAS, PE WEITZ, CM WALL, SD AF GREELEY, R SCHUBERT, G LIMONADI, D BENDER, KC NEWMAN, WI THOMAS, PE WEITZ, CM WALL, SD TI WIND STREAKS ON VENUS - CLUES TO ATMOSPHERIC CIRCULATION SO SCIENCE LA English DT Article ID CLOUD PHOTOPOLARIMETER IMAGES; MAGELLAN OBSERVATIONS; LEVEL CIRCULATION; FEATURES; GALILEO; MARS; PATTERNS; DYNAMICS; SURFACE; WAVES AB Magellan images reveal surface features on Venus attributed to wind processes. Sand dunes, wind-sculpted hills, and more than 5830 wind streaks have been identified. The streaks serve as local ''wind vanes,'' representing wind direction at the time of streak formation and allowing the first global mapping of near-surface wind patterns on Venus. Wind streaks are oriented both toward the equator and toward the west. When streaks associated with local transient events, such as impact cratering, are deleted, the westward component is mostly lost but the equatorward component remains. This pattern is consistent with a Hadley circulation of the lower atmosphere. C1 UNIV CALIF LOS ANGELES,DEPT EARTH & SPACE SCI,LOS ANGELES,CA 90024. JET PROP LAB,PASADENA,CA 91109. RP GREELEY, R (reprint author), ARIZONA STATE UNIV,DEPT GEOL,BOX 871404,TEMPE,AZ 85287, USA. RI Newman, William/E-5918-2011 OI Newman, William/0000-0002-9835-1428 NR 32 TC 8 Z9 8 U1 0 U2 3 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 21 PY 1994 VL 263 IS 5145 BP 358 EP 361 DI 10.1126/science.263.5145.358 PG 4 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA MT034 UT WOS:A1994MT03400027 PM 17769799 ER PT J AU RAMOSIZQUIERDO, L BUFTON, JL HAYES, P AF RAMOSIZQUIERDO, L BUFTON, JL HAYES, P TI OPTICAL-SYSTEM DESIGN AND INTEGRATION OF THE MARS OBSERVER LASER ALTIMETER SO APPLIED OPTICS LA English DT Article DE LASER ALTIMETER; RANGING; SPACEFLIGHT INSTRUMENT; DIODE-PUMPED ND-YAG; OPTOMECHANICAL DESIGN AB The Mars Observer Laser Altimeter, developed for flight on the Mars Observer spacecraft payload in September 1992, is designed to measure the topography of the Martian surface over a 2-year period from a 400-km mapping orbit. A 40 mJ pulse diode-pumped laser together with a 0.5-m-diameter beryllium telescope and a silicon avalanche photodiode are the principal optical subassemblies of this active remote-sensing instrument. Optical design rationale and measured optical performances during assembly and integration are presented. C1 NASA, GODDARD SPACE FLIGHT CTR, TERR PHYS LAB, GREENBELT, MD 20771 USA. NASA, GODDARD SPACE FLIGHT CTR, DIV SPACE TECHNOL, OPT TEST SECT, GREENBELT, MD 20771 USA. NR 7 TC 17 Z9 19 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 20 PY 1994 VL 33 IS 3 BP 307 EP 322 PG 16 WC Optics SC Optics GA MX856 UT WOS:A1994MX85600001 PM 20862020 ER PT J AU TRATT, DM MENZIES, RT AF TRATT, DM MENZIES, RT TI RECENT CLIMATOLOGICAL TRENDS IN ATMOSPHERIC AEROSOL BACKSCATTER DERIVED FROM THE JET-PROPULSION-LABORATORY MULTIYEAR BACKSCATTER PROFILE DATABASE SO APPLIED OPTICS LA English DT Article DE AEROSOL BACKSCATTER; CLIMATOLOGY; MT-PINATUBO ID CO2 LIDAR BACKSCATTER; WAVELENGTHS; CALIBRATION; 10.6-MU-M AB An update is provided on the Jet Propulsion Laboratory aerosol backscatter climatology database, with emphasis on the impact of the June 1991 eruption of Mt. Pinatubo. The data set is acquired at thermal infrared wavelengths with a range-gated coherent CO2 lidar system, which has been in regular operation since 1984. A number of analyses have been carried out to assess long-term trends in the tropospheric and lower stratospheric aerosol backscatter, as observed from the lidar site at Pasadena, California. RP TRATT, DM (reprint author), JET PROP LAB, 4800 OAK GROVE DR, PASADENA, CA 91109 USA. RI Tratt, David/A-7884-2009 OI Tratt, David/0000-0002-3942-6848 NR 23 TC 11 Z9 11 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 20 PY 1994 VL 33 IS 3 BP 424 EP 430 PG 7 WC Optics SC Optics GA MX856 UT WOS:A1994MX85600015 PM 20862034 ER PT J AU WEBSTER, CR MAY, RD TRIMBLE, CA CHAVE, RG KENDALL, J AF WEBSTER, CR MAY, RD TRIMBLE, CA CHAVE, RG KENDALL, J TI AIRCRAFT (ER-2) LASER INFRARED-ABSORPTION SPECTROMETER (ALIAS) FOR IN-SITU STRATOSPHERIC MEASUREMENTS OF HCL, N2O, CH4, NO2, AND HNO3 SO APPLIED OPTICS LA English DT Article ID ANTARCTIC OZONE; INTERFERENCE-FRINGES; NITROGEN AB The Aircraft Laser Infrared Absorption Spectrometer (ALIAS) instrument is a high-resolution (0.0003 cm-1) scanning tunable-diode-laser spectrometer designed, tested, and flown more than 30 times on the National Aeronautics and Space Administration's high-altitude ER-2 aircraft in the Airborne Arctic Stratospheric Expedition of 1991-1992. Using long-path infrared laser absorption spectroscopy to detect optical absorptions as small as 10(-5), ALIAS provides fast, continuous in-situ measurements of key atmospheric gases, with gas detection sensitivities oftens of parts in 10(12). With four lasers and detectors in a single liquid-nitrogen Dewar, simultaneous measurements of HCl, NO2, HNO3, CH4, and N2O are made using laser sources at 3.4-8 mum, injected into a 1-m-long, 80-pass Herriott cell. RP WEBSTER, CR (reprint author), JET PROP LAB, PASADENA, CA 91109 USA. NR 36 TC 169 Z9 169 U1 3 U2 12 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 20 PY 1994 VL 33 IS 3 BP 454 EP 472 PG 19 WC Optics SC Optics GA MX856 UT WOS:A1994MX85600019 PM 20862038 ER PT J AU FRY, JN AF FRY, JN TI THE MINIMAL POWER SPECTRUM - HIGHER-ORDER CONTRIBUTIONS SO ASTROPHYSICAL JOURNAL LA English DT Article DE METHODS, NUMERICAL ID PERTURBATIONS AB It has been an accepted belief for some time that gravity induces a minimal tail P(k) similar to k(4) in the power spectrum as k-->0 for distributions with no initial power on large scales. In a recent numerical experiment with initial power confined to a restricted range in k, Shandarin and Melott (1990) found a k-->0 tail that at early stages of evolution behaves as k(4) and grows with time as a(4)(t), where a(t) is the cosmological expansion factor, and at late times depends on scale as k(3) and grows with time as a(2)(t). I compute analytically several contributions to the power spectrum of higher order than those included in earlier work, and I apply the results to the particular case of initial power restricted to a finite range of k. As expected, in the perturbative regime P(k) similar to a(4)k(4) from the first correction to linear perturbation theory is the dominant term as k-->0. Numerical investigations show that higher order contributions go as k(4) also. However, perturbation theory alone cannot tell whether the P similar to a(2)k(3) result is ''nonperturbative'' or a numerical artifact. RP FRY, JN (reprint author), UNIV FLORIDA,NASA,FERMILAB ASTROPHYS CTR,FERMI NATL ACCELERATOR LAB,215 WILLIAMSON HALL,GAINESVILLE,FL 32611, USA. NR 12 TC 22 Z9 22 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 1994 VL 421 IS 1 BP 21 EP 26 DI 10.1086/173622 PN 1 PG 6 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA MU449 UT WOS:A1994MU44900004 ER PT J AU LEIGHLY, K KUNIEDA, H TSUSAKA, Y AWAKI, H TSURUTA, S AF LEIGHLY, K KUNIEDA, H TSUSAKA, Y AWAKI, H TSURUTA, S TI EVIDENCE FOR X-RAY FLUX AND SPECTRAL MODULATION BY ABSORPTION IN NGC-6814 .1. THE NATURE OF THE MOST RAPID VARIABILITY SO ASTROPHYSICAL JOURNAL LA English DT Article DE GALAXIES, INDIVIDUAL (NGC 6814); GALAXIES, SEYFERT; X-RAYS, GALAXIES ID ACTIVE GALACTIC NUCLEI; NON-THERMAL SOURCES; SEYFERT-1 GALAXIES; ACCRETION DISK; BLACK-HOLE; MODEL; NGC6814; LINE; MCG-6-30-15; ASTRONOMY AB The Seyfert 1 galaxy NGC 6814 was observed using the Japanese X-ray astronomy satellite Ginga in 1990 April and October. The rapid variability characteristically associated with this source was reconfirmed. Specifically, three dips were found in the April observation in which the flux dropped to nearly zero in similar to 300 s. The doubling timescale was similar to 50 s. A similar but separated drop and rise in flux was observed in the October data, different in that the flux did not decrease completely to zero. A detailed analysis of the data around the structures of most rapid variability found spectral variability and lags in flux between different energy bands. Lags were on the order of a few to tens of seconds for the April data, and on the order of tens to a couple of hundred seconds for the October data. The sense of the lags was such that during flux decreases the hard flux lagged, while during flux increases the soft flux lagged. Associated significant apparent hardening of the spectrum at low flux was observed in the April data. Apparent hardening of the spectrum also occurred in the October flux decrease, to a photon index of Gamma = 0.85; however, the spectrum softened at lowest flux to the index of the predecrease level, Gamma = 1.54. In the April dips, the line flux was found to decrease significantly. A marginal decrease in line flux was also observed in the October data. The variability of the line flux reconfirmed the result of Kunieda et al. (1990), who found that the line producton region must be within similar to 300 light-seconds from the source. To explain the observational results, a variable-absorption model was proposed, in which the column density was assumed to vary as a function of time. The time dependence of the column was determined in two ways. First, the functional dependence was assumed to be exponential, and model parameters were derived by fitting explicitly to the lag data obtained from the October observation. Second, a partial-covering spectral model was assumed, and the column density implied by the change in flux was found for both observations. The exponential folding time of the column density implied during the October flux decrease could be reliably determined to be about 100 s. The spectral variability could be qualitatively explained by the variable-absorption model, since superposition of continuously variable columns can result in an apparent hardening of the spectrum when measured by moderate-resolution instruments. The differences between the April and October observations could be explained if the two model parameters, the fraction of unabsorbed flux and the gradient with respect to time of the column density, were adjusted. Other physical processes, including intrinsic spectral changes and warm absorber models, which could account for the fastest variability, could be ruled out by the results of the data analysis. A primary constraint found for geometrical models is that the material which is doing the absorption must have relatively low ionization (xi < 100). This result leads to severe constraints on a general orbiting cloud model, requiring high densities (n similar to 10(16) cm(-3)) and sheetlike geometry. C1 NAGOYA UNIV, DEPT ASTROPHYS, CHIKUSA KU, NAGOYA 464, JAPAN. MONTANA STATE UNIV, DEPT PHYS, BOZEMAN, MT 59717 USA. RP LEIGHLY, K (reprint author), NASA, GODDARD SPACE FLIGHT CTR, HIGH ENERGY ASTROPHYS LAB, XRAY ASTROPHYS BRANCH, CODE 666, GREENBELT, MD 20771 USA. NR 45 TC 4 Z9 4 U1 0 U2 0 PU IOP PUBLISHING LTD PI BRISTOL PA TEMPLE CIRCUS, TEMPLE WAY, BRISTOL BS1 6BE, ENGLAND SN 0004-637X J9 ASTROPHYS J JI Astrophys. J. PD JAN 20 PY 1994 VL 421 IS 1 BP 69 EP 86 DI 10.1086/173626 PN 1 PG 18 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA MU449 UT WOS:A1994MU44900008 ER PT J AU LIEU, R QUENBY, JJ DROLIAS, B NAIDU, K AF LIEU, R QUENBY, JJ DROLIAS, B NAIDU, K TI ENHANCED COSMIC-RAY ACCELERATION RATES IN HIGHLY INCLINED ASTROPHYSICAL SHOCKS SO ASTROPHYSICAL JOURNAL LA English DT Article DE ACCELERATION OF PARTICLES; COSMIC RAYS; MHD; SHOCK WAVES ID PARTICLE-ACCELERATION; ENERGETIC PARTICLES; CHARGED-PARTICLES; FRONTS; PLASMA AB The theory of cosmic-ray acceleration by subluminal MHD astrophysical shocks according to the test particle approximation is extended to highly oblique shocks where flow speeds which appear nonrelativistic in the shock rest frame appear on transformation to the de Hoffmann-Teller or E=0 frame to have upstream flow speeds approaching c. Monte Carlo simulation shows that relative to the predictions of diffusion theory, as the upstream E=0 frame velocity approaches c, flatter spectra and faster acceleration rates occur. These spectral and acceleration time changes are similar to those found for relativistic, parallel MHD shocks and may affect all nonthermal active galactic nuclei emission from relativistic electrons. Also there is an additional means of increasing the upper limit of the cosmic-ray spectrum expected from active galactic nuclei, although the approximation used may not accurately reproduce the spectral shape. C1 UNIV LONDON IMPERIAL COLL SCI & TECHNOL,BLACKETT LAB,ASTROPHYS GRP,LONDON SW7 2BZ,ENGLAND. NASA,AMES RES CTR,MOFFETT FIELD,CA 94035. RP LIEU, R (reprint author), UNIV CALIF BERKELEY,CTR EXTREME ULTRAVIOLET ASTROPHYS,2150 KITTREDGE ST,BERKELEY,CA 94720, USA. NR 30 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 20 PY 1994 VL 421 IS 1 BP 211 EP 218 DI 10.1086/173638 PN 1 PG 8 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA MU449 UT WOS:A1994MU44900020 ER PT J AU MAYERHASSELWANDER, HA BERTSCH, DL BRAZIER, KTS CHIANG, J FICHTEL, CE FIERRO, JM HARTMAN, RC HUNTER, SD KANBACH, G KWOK, PW KNIFFEN, DA LIN, YC MATTOX, JR MICHELSON, PF NOLAN, PL PINKAU, K ROTHERMEL, H SCHNEID, EJ SOMMER, M SREEKUMAR, P THOMPSON, DJ VONMONTIGNY, C AF MAYERHASSELWANDER, HA BERTSCH, DL BRAZIER, KTS CHIANG, J FICHTEL, CE FIERRO, JM HARTMAN, RC HUNTER, SD KANBACH, G KWOK, PW KNIFFEN, DA LIN, YC MATTOX, JR MICHELSON, PF NOLAN, PL PINKAU, K ROTHERMEL, H SCHNEID, EJ SOMMER, M SREEKUMAR, P THOMPSON, DJ VONMONTIGNY, C TI HIGH-ENERGY GAMMA-RADIATION FROM GEMINGA OBSERVED BY EGRET SO ASTROPHYSICAL JOURNAL LA English DT Article DE GAMMA RAYS, OBSERVATIONS; PULSARS, INDIVIDUAL (GEMINGA) ID 1E 0630+178; RAY SOURCE; PULSAR; TELESCOPE; PERIOD; GAPS; VELA AB The Energetic Gamma Ray Experiment Telescope (EGRET) on the Compton Gamma Ray Observatory (CGRO) has carried out extensive studies of the gamma-ray source Geminga. Following the detection of pulsed X-rays (Halpern and Holt 1992) from Geminga, Bertsch et al. (1992) reported the same 237 ms periodicity to be visible in the EGRET data. A full analysis of the Geminga source shows that the energy spectrum is compatible with a power law with a spectral index of - 1.50 +/- 0.08 between 30 MeV and 2 GeV. A falloff relative to the power law is observed for energies above 2 GeV. Phase-resolved spectra also show power laws with high-energy cutoffs, but with significant variation of the spectral index with phase. No unpulsed emission is observed. No evidence for time variation was found within the EGRET observations. C1 NASA,GODDARD SPACE FLIGHT CTR,GREENBELT,MD 20771. STANFORD UNIV,WW HANSEN EXPTL PHYS LAB,STANFORD,CA 94305. STANFORD UNIV,DEPT PHYS,STANFORD,CA 94305. NASA,GSFC,POSTDOCTORAL RES ASSOCIATE,NRC,NAS,GREENBELT,MD 20771. HAMPDEN SYDNEY COLL,DEPT PHYS & ASTRON,HAMPDEN SYDNEY,VA 23943. GRUMMAN AEROSP CORP,BETHPAGE,NY 11714. USRA,WASHINGTON,DC. RP MAYERHASSELWANDER, HA (reprint author), MAX PLANCK INST EXTRATERR PHYS,D-85748 GARCHING,GERMANY. RI Nolan, Patrick/A-5582-2009; Hunter, Stanley/D-2942-2012; Thompson, David/D-2939-2012 OI Thompson, David/0000-0001-5217-9135 NR 47 TC 64 Z9 64 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 1994 VL 421 IS 1 BP 276 EP 283 DI 10.1086/173645 PN 1 PG 8 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA MU449 UT WOS:A1994MU44900027 ER PT J AU SHORE, SN SONNEBORN, G STARRFIELD, S GONZALEZRIESTRA, R POLIDAN, RS AF SHORE, SN SONNEBORN, G STARRFIELD, S GONZALEZRIESTRA, R POLIDAN, RS TI THE EARLY BOLOMETRIC EVOLUTION OF NOVA-CYGNI 1992 SO ASTROPHYSICAL JOURNAL LA English DT Article DE NOVAE, CATACLYSMIC VARIABLES; STARS, INDIVIDUAL (NOVA CYGNI 1992); ULTRAVIOLET, STARS ID HYDRODYNAMIC MODELS; OXYGEN; NEON AB We report on combined ultraviolet and optical observations of early stages of the outburst of Nova Cygni 1992. We show that the initial optical rise and decline and produced by the dramatic increase in UV line opacity and its gradual subsequent lifting as the ejecta expand. The source of the M(V) - t(3) relation is easily understood in light of these low-resolution UV spectra. The multiwavelength data confirm the theoretical prediction that a nova evolves at a constant bolometric luminosity in the early stages of outburst. We verify the prediction for this nova for at least the first month of the outburst. The detection of far-UV radiation with the Voyager Ultraviolet Spectrometer and the detection of an increasing X-ray flux with ROSAT imply that this phase lasted for more than 6 months. C1 COMP SCI CORP, GODDARD SPACE FLIGHT CTR, GHRS SCI TEAM, GREENBELT, MD 20771 USA. OBSERV MEUDON, DEMIRM, F-92090 MEUDON, FRANCE. GODDARD SPACE FLIGHT CTR, ASTRON & SOLAR PHYS LAB, GREENBELT, MD 20771 USA. ARIZONA STATE UNIV, DEPT PHYS & ASTRON, TEMPE, AZ 85287 USA. EUROPEAN SPACE AGCY, IUE OBSERV, VILLAFRANCA, SPAIN. NR 24 TC 52 Z9 52 U1 0 U2 0 PU IOP PUBLISHING LTD PI BRISTOL PA DIRAC HOUSE, TEMPLE BACK, BRISTOL BS1 6BE, ENGLAND SN 0004-637X J9 ASTROPHYS J JI Astrophys. J. PD JAN 20 PY 1994 VL 421 IS 1 BP 344 EP 349 DI 10.1086/173651 PN 1 PG 6 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA MU449 UT WOS:A1994MU44900033 ER PT J AU OFMAN, L DAVILA, JM STEINOLFSON, RS AF OFMAN, L DAVILA, JM STEINOLFSON, RS TI CORONAL HEATING BY THE RESONANT ABSORPTION OF ALFVEN WAVES - THE EFFECT OF VISCOUS STRESS TENSOR SO ASTROPHYSICAL JOURNAL LA English DT Article DE MHD; SUN, CORONA ID NON-UNIFORM PLASMA; SURFACE-WAVES; SOLAR CORONA; NORMAL-MODES; RESISTIVE MAGNETOHYDRODYNAMICS; ACTIVE REGION; INSTABILITY; DYNAMICS; LOOPS; IDEAL AB The time-dependent linearized MHD equations for a fully compressible, low-beta, viscoresistive plasma are solved numerically using an implicit integration scheme. The full viscosity stress tenser (Braginskii 1965) is included with the five parameters eta(i), i = 0-4. In agreement with previous studies, the numerical simulations demonstrate that the dissipation on inhomogeneities in the background Alfven speed occurs in a narrow resonant layer. For an active region in the solar corona the values of eta(i) are eta(0) = 0.65 g cm(-1) s(-1), eta(1) = 3.7 x 10(-12) g cm(-1) s(-1), eta(2) = 4 eta(1), eta(3) = 1.4 x 10(-6) g cm(-1) s(-1), eta(4) = 2 eta(3), with n = 10(10) cm(-3), T = 2 x 10(6) K, and B = 100 G. When the Lundquist number S = 10(4) and R(1) much greater than S(where R(1) is the dimensionless shear viscous number) the width of the resistive dissipation layer d(r) is 0.22a (where a is the density gradient length scale) and d(r) similar to S--1/3. When S much greater than R(1) the shear viscous dissipation layer width d(v) scales as R(1)(-1/3) The shear viscous and the resistive dissipation occurs in an overlapping narrow region, and the total heating rate is independent of the value of the dissipation parameters in agreement with previous studies. Consequently, the maximum values of the perpendicular velocity and perpendicular magnetic field scale as R(1)(1/3) It is evident from the simulations that for solar parameters the heating due to the compressive viscosity (R(0) = 560) is negligible compared to the resistive and the shear viscous (R(1)) dissipation and it occurs in a broad layer of order a in width. In the solar corona with S approximate to 10(14) and R(1) x 10(14) (as calculated from the Braginskii expressions), the shear viscous resonant heating is of comparable magnitude to the resistive resonant heating. C1 SW RES INST, DEPT SPACE SCI, SAN ANTONIO, TX 78228 USA. RP NASA, GODDARD SPACE FLIGHT CTR, ASTRON & SOLAR PHYS LAB, GREENBELT, MD 20771 USA. NR 29 TC 86 Z9 88 U1 1 U2 3 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 JAN 20 PY 1994 VL 421 IS 1 BP 360 EP 371 DI 10.1086/173654 PN 1 PG 12 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA MU449 UT WOS:A1994MU44900036 ER PT J AU KARPEN, JT DAHLBURG, RB DAVILA, JM AF KARPEN, JT DAHLBURG, RB DAVILA, JM TI THE EFFECTS OF KELVIN-HELMHOLTZ INSTABILITY ON RESONANCE-ABSORPTION LAYERS IN CORONAL LOOPS SO ASTROPHYSICAL JOURNAL LA English DT Article DE INSTABILITIES; MHD; SUN, CORONA ID SOLAR CORONA; ALFVEN WAVES; NUMERICAL-SIMULATION; CURRENT SHEETS; SURFACE-WAVES; TURBULENCE; PLASMAS AB One of the long-standing uncertainties in the wave-resonance theory of coronal heating is the stability of the resonance layer. The wave motions in the resonance layer produce highly localized shear flows which vary sinusoidally in time with the resonance period. This configuration is potentially susceptible to the Kelvin-Helmholtz instability (KHI), which can enhance small-scale structure and turbulent broadening of shear layers on relatively rapid ideal timescales. We have investigated numerically the response of a characteristic velocity profile, derived from resonance absorption models, to finite fluid perturbations comparable to photospheric fluctuations. We find that the KHI primarily should affect long (greater than or similar to 6 x 10(4) km) loops where higher velocity flows (M greater than or similar to 0.2) exist in resonance layers of order 100 km wide. There, the Kelvin-Helmholtz growth time is comparable to or less than the resonance quarter-period, and the potentially stabilizing magnetic effects are not felt until the instability is well past the linear growth stage. Not only is the resonance layer broadened by the KHI, but also the convective energy transport out of the resonance layer is increased, thus adding to the efficiency of the wave-resonance heating process. In shorter loops, e.g., those in bright points and compact flares, the stabilization due to the magnetic field and the high resonance frequency inhibit the growth of the Kelvin-Helmholtz instability beyond a minimal level. C1 USN,RES LAB,COMPUTAT PHYS & FLUID DYNAM LAB,WASHINGTON,DC 20375. NASA,GODDARD SPACE FLIGHT CTR,GREENBELT,MD 20771. RP KARPEN, JT (reprint author), USN,RES LAB,EO HULBURT CTR SPACE RES,CODE 7675K,WASHINGTON,DC 20375, USA. RI Karpen, Judith/E-1484-2012 NR 35 TC 21 Z9 21 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 20 PY 1994 VL 421 IS 1 BP 372 EP 380 DI 10.1086/173655 PN 1 PG 9 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA MU449 UT WOS:A1994MU44900037 ER PT J AU HALL, TM PLUMB, RA AF HALL, TM PLUMB, RA TI AGE AS A DIAGNOSTIC OF STRATOSPHERIC TRANSPORT SO JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES LA English DT Article ID OZONE DEPLETION; CARBON-DIOXIDE; AIR; CONSTITUENTS; TROPOSPHERE; MODEL; CLIMATE; IMPACT AB Estimates of stratospheric age from observations of long-lived trace gases with increasing tropospheric concentrations invoke the implicit assumption that an air parcel has been transported intact from the tropopical tropopause. However, because of rapid and irreversible mixing in the stratosphere, a particular air parcel cannot be identified with one that left the troposphere at some prior time. The parcel contains a mix of air with a range of transit times, and the mean value over this range is the most appropriate definition of age. The measured tracer concentration is also a mean over the parcel, but its value depends both on the transit time distribution and the past history of the tracer in the troposphere. In principle, only if the tropospheric concentration is increasing linearly can the age be directly inferred. We illustrate these points by employing both a one-dimensional diffusive analog of stratospheric transport, and the general circulation model (GCM) of the Goddard Institute for Space Studies (GISS). Within the limits of the GCM, we estimate the time over which tropospheric tracer concentrations must be approximately linear in order to determine stratospheric age unambiguously; the concentration of an exponentially increasing tracer is a function only of age if the growth time constant is greater than about 7 years, which is true for all the chlorofluorocarbons. More rapid source variations (for example, the annual cycle in CO2) have no such direct relationship with age. C1 MIT, CTR METEOROL & PHYS OCEANOG, DEPT EARTH ATMOSPHER & PLANETARY SCI, CAMBRIDGE, MA 02139 USA. NASA, GODDARD INST SPACE STUDIES, NEW YORK, NY 10025 USA. COLUMBIA UNIV, NEW YORK, NY USA. NR 20 TC 233 Z9 234 U1 3 U2 15 PU AMER GEOPHYSICAL UNION PI WASHINGTON PA 2000 FLORIDA AVE NW, WASHINGTON, DC 20009 USA SN 2169-897X J9 J GEOPHYS RES-ATMOS JI J. Geophys. Res.-Atmos. PD JAN 20 PY 1994 VL 99 IS D1 BP 1059 EP 1070 DI 10.1029/93JD03192 PG 12 WC Meteorology & Atmospheric Sciences SC Meteorology & Atmospheric Sciences GA MT032 UT WOS:A1994MT03200005 ER PT J AU WAUGH, DW PLUMB, RA ATKINSON, RJ SCHOEBERL, MR LAIT, LR NEWMAN, PA LOEWENSTEIN, M TOOHEY, DW AVALLONE, LM WEBSTER, CR MAY, RD AF WAUGH, DW PLUMB, RA ATKINSON, RJ SCHOEBERL, MR LAIT, LR NEWMAN, PA LOEWENSTEIN, M TOOHEY, DW AVALLONE, LM WEBSTER, CR MAY, RD TI TRANSPORT OUT OF THE LOWER STRATOSPHERIC ARCTIC VORTEX BY ROSSBY-WAVE BREAKING SO JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES LA English DT Article ID POTENTIAL VORTICITY; PLANETARY-WAVES; OZONE; DYNAMICS; STABILITY; TRACER; TRENDS; WINTER AB The fine-scale structure in lower stratospheric tracer transport during the period of the two Arctic Airborne Stratospheric Expeditions (January and February 1989; December 1991 to March 1992) is investigated using contour advection with surgery calculations. These calculations show that Rossby wave breaking is an ongoing occurrence during these periods and that air is ejected from the polar vortex in the form of long filamentary structures. There is good qualitative agreement between these filaments and measurements of chemical tracers taken aboard the NASA ER-2 aircraft. The ejected air generally remains filamentary and is stretched and mixed with midlatitude air as it is wrapped around the vortex. This process transfers vortex air into midlatitudes and also produces a narrow region of fine-scale filaments surrounding the polar vortex. Among other things, this makes it difficult to define a vortex edge. The calculations also show that strong stirring can occur inside as well as outside the vortex. C1 HARVARD UNIV, DEPT CHEM, CAMBRIDGE, MA 02138 USA. NASA, GODDARD SPACE FLIGHT CTR, GREENBELT, MD 20771 USA. NASA, AMES RES CTR, MOFFETT FIELD, CA 94035 USA. JET PROPULS LAB, PASADENA, CA USA. UNIV CALIF IRVINE, DEPT GEOSCI, IRVINE, CA USA. RP WAUGH, DW (reprint author), MIT, CTR METEOROL & PHYS OCEANOG, 54-1726, CAMBRIDGE, MA 02139 USA. RI Toohey, Darin/A-4267-2008; Newman, Paul/D-6208-2012; Waugh, Darryn/K-3688-2016 OI Toohey, Darin/0000-0003-2853-1068; Newman, Paul/0000-0003-1139-2508; Waugh, Darryn/0000-0001-7692-2798 NR 44 TC 202 Z9 202 U1 1 U2 9 PU AMER GEOPHYSICAL UNION PI WASHINGTON PA 2000 FLORIDA AVE NW, WASHINGTON, DC 20009 USA SN 2169-897X J9 J GEOPHYS RES-ATMOS JI J. Geophys. Res.-Atmos. PD JAN 20 PY 1994 VL 99 IS D1 BP 1071 EP 1088 DI 10.1029/93JD02556 PG 18 WC Meteorology & Atmospheric Sciences SC Meteorology & Atmospheric Sciences GA MT032 UT WOS:A1994MT03200006 ER PT J AU PLUMB, RA WAUGH, DW ATKINSON, RJ NEWMAN, PA LAIT, LR SCHOEBERL, MR BROWELL, EV SIMMONS, AJ LOEWENSTEIN, M AF PLUMB, RA WAUGH, DW ATKINSON, RJ NEWMAN, PA LAIT, LR SCHOEBERL, MR BROWELL, EV SIMMONS, AJ LOEWENSTEIN, M TI INTRUSIONS INTO THE LOWER STRATOSPHERIC ARCTIC VORTEX DURING THE WINTER OF 1991-1992 SO JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES LA English DT Article ID BREAKING PLANETARY-WAVES; ANTARCTIC OZONE HOLE; SOUTH POLAR VORTEX; POTENTIAL VORTICITY; CONTOUR DYNAMICS; TRANSPORT; SURGERY; MODEL AB Investigations of the kinematics of the lower stratospheric Arctic vortex during the winter of 1991-1992 using the contour advection with surgery technique reveal three distinct events in which there was substantial intrusion of midlatitude air into the vortex, in apparent contradiction of the view that the polar vortex constitutes an isolated air mass. Two of these events, in late January and mid-February, were well documented. They were predicted in high-resolution forecasts by the European Centre for Medium-Range Weather Forecasts, most clearly in experimental forecasts with reduced diffusion. Direct confirmation of the presence of the intrusions and of their calculated locations was provided by aerosol observations from the airborne differential absorption laser lidar aboard the NASA DC-8, taken as part of the second Airborne Arctic Statospheric Expedition campaign; aerosol-rich air of midlatitude origin was seen in the expected position of the intrusions. The reality of the February event was also confirmed by in situ measurements from the NASA ER-2. Such events may be significant for the chemical processes taking place within the winter vortex. The intrusions were evidently related to the meteorology of the northern stratosphere during this winter and in particular to persistent tropospheric blocking over the northeastern Atlantic Ocean and western Europe and concomitant ridging into the lower stratospheric vortex in this region. Nevertheless, preliminary investigations have indicated that such events are not uncommon in other northern hemisphere winters, although no such events were found in the southern hemisphere during the Antarctic winter of 1987. C1 NASA, LANGLEY RES CTR, HAMPTON, VA 23665 USA. NASA, GODDARD SPACE FLIGHT CTR, GREENBELT, MD 20771 USA. NASA, AMES RES CTR, MOFFETT FIELD, CA 94035 USA. EUROPEAN CTR MEDIUM RANGE WEATHER FORECASTS, READING RG2 9AX, BERKS, ENGLAND. RP PLUMB, RA (reprint author), MIT, CTR METEOROL & PHYS OCEANOG, 54-1726, CAMBRIDGE, MA 02139 USA. RI Newman, Paul/D-6208-2012; Waugh, Darryn/K-3688-2016 OI Newman, Paul/0000-0003-1139-2508; Waugh, Darryn/0000-0001-7692-2798 NR 28 TC 148 Z9 148 U1 0 U2 8 PU AMER GEOPHYSICAL UNION PI WASHINGTON PA 2000 FLORIDA AVE NW, WASHINGTON, DC 20009 USA SN 2169-897X J9 J GEOPHYS RES-ATMOS JI J. Geophys. Res.-Atmos. PD JAN 20 PY 1994 VL 99 IS D1 BP 1089 EP 1105 DI 10.1029/93JD02557 PG 17 WC Meteorology & Atmospheric Sciences SC Meteorology & Atmospheric Sciences GA MT032 UT WOS:A1994MT03200007 ER PT J AU PATTEN, KO CONNELL, PS KINNISON, DE WUEBBLES, DJ SLANGER, TG FROIDEVAUX, L AF PATTEN, KO CONNELL, PS KINNISON, DE WUEBBLES, DJ SLANGER, TG FROIDEVAUX, L TI EFFECT OF VIBRATIONALLY EXCITED OXYGEN ON OZONE PRODUCTION IN THE STRATOSPHERE SO JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES LA English DT Article ID SCHUMANN-RUNGE BANDS; MIDDLE ATMOSPHERE; MOLECULAR-OXYGEN; PHOTODISSOCIATION; DISSOCIATION; SPECTROSCOPY; ABSORPTION; CONTINUUM; CONSTANTS; MODEL AB Photolysis of vibrationally excited oxygen produced by ultraviolet photolysis of ozone in the upper stratosphere is incorporated into the Lawrence Livermore National Laboratory two-dimensional zonally averaged chemical-radiative-transport model of the troposphere and stratosphere. The importance of this potential contributor of odd oxygen to the concentration of ozone is evaluated based on recent information on vibrational distributions of excited oxygen and on preliminary studies of energy transfer from the excited oxygen. When energy transfer rate constants similar to those of Toumi et al. [1991] are assumed, increases in model ozone concentrations of up to 4.0% in the upper stratosphere are found, and the model ozone concentrations are found to agree slightly better with measurements, including recent data from the Upper Atmosphere Research Satellite. However, the ozone increase is only 0.3% when the larger energy transfer rate constants indicated by recent experimental work are applied to the model. An ozone increase of 1% at 50 km requires energy transfer rate constants one-twentieth those of the preliminary observations. As a result, vibrationally excited oxygen processes probably do not contribute enough ozone to be significant in models of the upper stratosphere. C1 JET PROPULS LAB, PASADENA, CA 91109 USA. SRI INT, MENLO PK, CA 94025 USA. NR 41 TC 29 Z9 29 U1 0 U2 2 PU AMER GEOPHYSICAL UNION PI WASHINGTON PA 2000 FLORIDA AVE NW, WASHINGTON, DC 20009 USA SN 2169-897X J9 J GEOPHYS RES-ATMOS JI J. Geophys. Res.-Atmos. PD JAN 20 PY 1994 VL 99 IS D1 BP 1211 EP 1223 DI 10.1029/93JD02549 PG 13 WC Meteorology & Atmospheric Sciences SC Meteorology & Atmospheric Sciences GA MT032 UT WOS:A1994MT03200014 ER PT J AU LAU, KM MEHTA, VM SUD, YC WALKER, GK AF LAU, KM MEHTA, VM SUD, YC WALKER, GK TI CLIMATOLOGY AND NATURAL VARIABILITY OF THE GLOBAL HYDROLOGIC-CYCLE IN THE GLA ATMOSPHERIC GENERAL-CIRCULATION MODEL SO JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES LA English DT Article ID WATER-VAPOR; PARAMETERIZATION; RADIATION; BIOSPHERE; GCM AB Time average climatology and low-frequency variabilities of the global hydrologic cycle (GHC) in the Goddard Laboratory for Atmospheres (GLA) general circulation model (GCM) were investigated in the present work. A 730-day experiment was conducted with the GLA GCM forced by insolation, sea surface temperature, and ice-snow undergoing climatological annual cycles. Influences of interactive soil moisture on time average climatology and natural variability of the GHC were also investigated by conducting 365-day experiments with and without interactive soil moisture. Insolation, sea surface temperature, and ice-snow were fixed at their July levels in the latter two experiments. Results show that the model's time average hydrologic cycle variables for July in all three experiments agree reasonably well with observations. Except in the case of precipitable water, the zonal average climates of the annual cycle experiment and the two perpetual July experiments are alike, i.e., their differences are within limits of the natural variability of the model's climate. Statistics of various components of the GHC, i.e., water vapor, evaporation, and precipitation, are significantly affected by the presence of interactive soil moisture. Even with fixed external conditions, the GHC exhibits a variety of low-frequency natural variabilities. A long-term trend is found in the principal empirical modes of variability of ground wetness, evaporation, and sensible heat. Dominant modes of variability of these quantities over land are physically consistent with one another and with land surface energy balance requirements. The dominant empirical modes of ground wetness variability in the annual cycle and perpetual July experiments have similar spatial patterns. The dominant mode of precipitation variability is found to be closely related to organized convection over the tropical western Pacific Ocean. The precipitation variability has timescales in the range of 2 to 3 months and can be identified with the stationary component of the Madden-Julian Oscillation. The precipitation mode is not sensitive to the presence of interactive soil moisture but is closely linked to both the rotational and divergent components of atmospheric moisture transport. The present results indicate that globally coherent natural variability of the GHC in the GLA GCM has two basic timescales in the absence of annual cycles of external forcings: a long-term trend associated with atmosphere-soil moisture interaction which affects the model atmosphere mostly over midlatitude continental regions and a large-scale 2- to 3-month variability associated with atmospheric moist processes over the western Pacific Ocean. C1 UNIV SPACE RES ASSOC, GREENBELT, MD USA. GEN SCI CORP, GREENBELT, MD USA. RP LAU, KM (reprint author), NASA, GODDARD SPACE FLIGHT CTR, ATMOSPHERES LAB, GREENBELT, MD 20771 USA. RI Lau, William /E-1510-2012 OI Lau, William /0000-0002-3587-3691 NR 20 TC 2 Z9 3 U1 0 U2 0 PU AMER GEOPHYSICAL UNION PI WASHINGTON PA 2000 FLORIDA AVE NW, WASHINGTON, DC 20009 USA SN 2169-897X J9 J GEOPHYS RES-ATMOS JI J. Geophys. Res.-Atmos. PD JAN 20 PY 1994 VL 99 IS D1 BP 1329 EP 1345 DI 10.1029/93JD02754 PG 17 WC Meteorology & Atmospheric Sciences SC Meteorology & Atmospheric Sciences GA MT032 UT WOS:A1994MT03200023 ER PT J AU ROULET, NT JANO, A KELLY, CA KLINGER, LF MOORE, TR PROTZ, R RITTER, JA ROUSE, WR AF ROULET, NT JANO, A KELLY, CA KLINGER, LF MOORE, TR PROTZ, R RITTER, JA ROUSE, WR TI ROLE OF THE HUDSON-BAY LOWLAND AS A SOURCE OF ATMOSPHERIC METHANE SO JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES LA English DT Article AB Based on point measurements of methane flux from wetlands in the boreal and subarctic regions, northern wetlands are a major source of atmospheric methane. However, measurements have not been carried out in large continuous peatlands such as the the Hudson Bay Lowland (HBL) (320,000 km(2)) and the Western Siberian lowland (540,000 km(2)), which together account for over 30% of the wetlands north of 40 degrees N. To determine the role the Hudson Bay Lowland as a source of atmospheric methane, fluxes were measured by enclosures throughout the 1990 snow-free period in all the major wetland types and also by an aircraft in July. Two detailed survey areas were investigated: one (approximate to 900 km(2)) was in the high subarctic region of the northern lowland and the second area (approximate to 4,800 km(2)) straddled the Low Subarctic and High Boreal regions of the southern lowland. The fluxes were integrated over the study period to produce annual methane emissions for each wetland type, The fluxes were then weighted by the area of 16 different habitats for the southern area and 5 habitats for the northern area, as determined from Landsat thematic mapper to yield an annual habitat-weighted emission. On a per unit area basis, 1.31 +/- 0.11 and 2.79 +/- 0.39 g CH4 m(-2) yr(-1) were emitted from the southern and northern survey areas, respectively. The extrapolated enclosure estimates for a 3-week period in July were compared to within 10% of the flux derived by airborne eddy correlation measurements made during the same period. The aircraft mean flux of 10 +/- 9 mg CH4 m(-2) d(-1) was not statistically different from the extrapolated mean flux of 20 +/- 16 mg CH4 m(-2) d(-1) weighted emission for the entire HBL using six wetland classes is estimated as 0.538 +/- 0.187 Tg CH4 yr(-1) (range of extreme cases is 0.057 to 2.112 Tq CH4 yr(-1)). This value is much lower than expected, based on previous emission estimates from northern wetlands. C1 MINIST NAT RESOURCES, ONTARIO CTR REMOTE SENSING, N YORK M2N 3A1, ON, CANADA. UNIV MANITOBA, DEPT MICROBIOL, WINNIPEG R3J 2N2, MB, CANADA. NATL CTR ATMOSPHER RES, BOULDER, CO 80307 USA. UNIV GUELPH, GUELPH N1G 2W1, ON, CANADA. NASA, LANGLEY RES CTR, DIV ATMOSPHER SCI, HAMPTON, VA 23665 USA. MCMASTER UNIV, DEPT GEOG, HAMILTON L8S 1K4, ON, CANADA. YORK UNIV, DEPT GEOG, N YORK M3J 1P3, ON, CANADA. RP ROULET, NT (reprint author), MCGILL UNIV, DEPT GEOG, 805 SHERBROOKE ST W, MONTREAL H3A 2K6, PQ, CANADA. NR 40 TC 109 Z9 109 U1 2 U2 28 PU AMER GEOPHYSICAL UNION PI WASHINGTON PA 2000 FLORIDA AVE NW, WASHINGTON, DC 20009 USA SN 2169-897X J9 J GEOPHYS RES-ATMOS JI J. Geophys. Res.-Atmos. PD JAN 20 PY 1994 VL 99 IS D1 BP 1439 EP 1454 DI 10.1029/93JD00261 PG 16 WC Meteorology & Atmospheric Sciences SC Meteorology & Atmospheric Sciences GA MT032 UT WOS:A1994MT03200034 ER PT J AU HARRISS, RC WOFSY, SC HOELL, JM BENDURA, RJ DREWRY, JW MCNEAL, RJ PIERCE, D RABINE, V SNELL, RL AF HARRISS, RC WOFSY, SC HOELL, JM BENDURA, RJ DREWRY, JW MCNEAL, RJ PIERCE, D RABINE, V SNELL, RL TI THE ARCTIC BOUNDARY-LAYER EXPEDITION (ABLE-3B) - JULY-AUGUST 1990 SO JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES LA English DT Article ID DRY SEASON; AMAZON AB The Arctic Boundary Layer Expedition (ABLE) 3B used data from ground-based, aircraft, and satellite platforms to characterize the chemistry and dynamics of the troposphere in subarctic and Arctic regions of midcontinent and eastern Canada during July-August 1990. This paper reports the experimental design for ABLE 3B and a brief overview of results. The detailed results are presented in a series of papers in this issue. The chemical composition of the atmospheric mixed layer over remote tundra, boreal wetland, and forested environments was influenced by emissions of CH4 and nonmethane hydrocarbons from biogenic sources, emissions of gases and aerosols from local biomass burning, and transport of pollutants into the study areas from urban/industrial sources. Minimum concentrations of both trace gas and aerosol species in boundary layer air were associated with Arctic source areas. In the free troposphere the biospheric influence was undetectable, and major sources of chemical variability were related to long-range transport of pollutants into the study areas from biomass burning and industrial sources in Alaska and the Great Lakes regions, respectively. Minimum concentrations of both trace gas and aerosol species in the free troposphere were associated with a persistent, widespread air mass which both chemistry and air mass trajectory analyses suggested had originated in the tropical Pacific. Subsidence of air from the upper troposphere and lower stratosphere frequently enhanced ozone and influenced other trace gas and aerosol species at midtropospheric altitudes. The North American Arctic is a complex dynamical and chemical environment with considerable spatial and temporal variability in aerosol and trace gas concentrations. The use of atmospheric chemical indicators for climate change detection will require a much more comprehensive Arctic monitoring program than currently exists. C1 NASA, LANGLEY RES CTR, HAMPTON, VA 23665 USA. NASA HEADQUARTERS, WASHINGTON, DC 20546 USA. NASA, WALLOPS FLIGHT FACIL, WALLOPS ISL, VA 23337 USA. HARVARD UNIV, DEPT EARTH & PLANETARY SCI, CAMBRIDGE, MA 02138 USA. RP HARRISS, RC (reprint author), UNIV NEW HAMPSHIRE, INST STUDY EARTH OCEANS & SPACE, DURHAM, NH 03824 USA. NR 38 TC 50 Z9 51 U1 0 U2 6 PU AMER GEOPHYSICAL UNION PI WASHINGTON PA 2000 FLORIDA AVE NW, WASHINGTON, DC 20009 USA SN 2169-897X J9 J GEOPHYS RES-ATMOS JI J. Geophys. Res.-Atmos. PD JAN 20 PY 1994 VL 99 IS D1 BP 1635 EP 1643 DI 10.1029/93JD01788 PG 9 WC Meteorology & Atmospheric Sciences SC Meteorology & Atmospheric Sciences GA MT032 UT WOS:A1994MT03200049 ER PT J AU SHIPHAM, MC BACHMEIER, AS CAHOON, DR GREGORY, GL ANDERSON, BE BROWELL, EV AF SHIPHAM, MC BACHMEIER, AS CAHOON, DR GREGORY, GL ANDERSON, BE BROWELL, EV TI A METEOROLOGICAL INTERPRETATION OF THE ARCTIC BOUNDARY-LAYER EXPEDITION (ABLE) 3B FLIGHT SERIES SO JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES LA English DT Article ID TRANSPORT AB The Arctic Boundary Layer Expedition (ABLE) 3B was conducted to determine the summertime tropospheric distribution, sources, and sinks of important trace gas and aerosol species over the wetlands and boreal forests of central and eastern Canada. Isentropic trajectories and analyzed midtropospheric circulation patterns were used to group flights according to the transport histories of polar, midlatitude, or tropical air mas ses which were sampled. These data were then divided into bands of potential temperature levels representing the low, middle, and maximum aircraft altitudes to assess the effects of both local and long distance transport and natural and man-made pollutants to the measured chemical species. Detailed case studies are provided to depict the complex three-dimensional airflow regimes that transported air with differing chemical signatures to the study area. Mission 6 details the large-scale movement of smoke in the generally prevailing west to northwesterly airflow that was observed on the majority of flights. Mission I analyzes the horizontal and vertical motions of maritime Pacific air in the upper troposphere that was routinely mixed downward to the aircraft altitude. Finally, mission 14 tracks the far northward excursion of tropical air that had been associated with a Pacific typhoon. The following three factors all had important influences on the collected chemical data sets: (1) local and distant stratospheric in puts into the upper and middle troposphere; (2) biomass-burning plumes from active fires in Alaska and Canada; (3) a band of ''low ozone'' upper tropospheric air that was observed by airborne differential absorption lidar (DIAL) above the aircraft maximum altitude. Other modification factors observed on some flights included urban pollution from U.S. and Canadian cities, tropical air that had been associated with a Pacific typhoon, and precipitation scavenging by clouds and rain. Many flights were affected by several of the above factors which led to complex chemical signatures that will be discussed in other companion papers. C1 NASA, LANGLEY RES CTR, DIV ATMOSPHER SCI, HAMPTON, VA 23665 USA. LOCKHEED ENGN & SCI CO, HAMPTON, VA 23666 USA. NR 23 TC 29 Z9 29 U1 0 U2 4 PU AMER GEOPHYSICAL UNION PI WASHINGTON PA 2000 FLORIDA AVE NW, WASHINGTON, DC 20009 USA SN 2169-897X J9 J GEOPHYS RES-ATMOS JI J. Geophys. Res.-Atmos. PD JAN 20 PY 1994 VL 99 IS D1 BP 1645 EP 1657 DI 10.1029/93JD01082 PG 13 WC Meteorology & Atmospheric Sciences SC Meteorology & Atmospheric Sciences GA MT032 UT WOS:A1994MT03200050 ER PT J AU HARRISS, RC SACHSE, GW COLLINS, JE WADE, L BARTLETT, KB TALBOT, RW BROWELL, EV BARRIE, LA HILL, GF BURNEY, LG AF HARRISS, RC SACHSE, GW COLLINS, JE WADE, L BARTLETT, KB TALBOT, RW BROWELL, EV BARRIE, LA HILL, GF BURNEY, LG TI CARBON-MONOXIDE AND METHANE OVER CANADA - JULY-AUGUST 1990 SO JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES LA English DT Article ID UNITED-STATES AB Carbon monoxide (CO) and methane (CH4) were measured in the 0.15- to 6-km portion of the troposphere over subarctic and boreal landscapes of midcontinent and eastern Canada during July-August 1990. In the mid-continent region, Arctic air entering the region was characterized by relatively uniform CO concentrations (86-108 parts per billion by volume (ppbv)) and CH4 concentrations (1729-1764 ppbv). Local biomass burning and long-range transport of CO into the area from industrial/urban sources and distant fires did frequently produce enhanced and variable concentrations. Emissions of CH4 from the Hudson Bay lowlands was the primary source far enhanced and variable concentrations, especially at altitudes of 0.15-1 km. In eastern Canada, most of the observed variability in CO and CH4 was similar in origin to the phenomena described for the midcontinent region. However, unexpectedly low concentrations of CO (51 ppbv) and CH4 (1688 ppbv) were measured in the midtroposphere on several flights. Combined meteorological and chemical data indicated that the low CO-CH4( )events were the result of long-range transport of tropical Pacific marine air to subarctic latitudes. C1 NASA, LANGLEY RES CTR, HAMPTON, VA 23665 USA. STC CORP, HAMPTON, VA 23666 USA. LOCKHEED ENGN & SCI CO, HAMPTON, VA 23666 USA. ATMOSPHER ENVIRONM SERV, DOWNSVIEW M3H 5T4, ON, CANADA. RP HARRISS, RC (reprint author), UNIV NEW HAMPSHIRE, INST STUDY EARTH OCEANS & SPACE, DURHAM, NH 03824 USA. NR 20 TC 41 Z9 41 U1 0 U2 0 PU AMER GEOPHYSICAL UNION PI WASHINGTON PA 2000 FLORIDA AVE NW, WASHINGTON, DC 20009 USA SN 2169-897X J9 J GEOPHYS RES-ATMOS JI J. Geophys. Res.-Atmos. PD JAN 20 PY 1994 VL 99 IS D1 BP 1659 EP 1669 DI 10.1029/93JD01906 PG 11 WC Meteorology & Atmospheric Sciences SC Meteorology & Atmospheric Sciences GA MT032 UT WOS:A1994MT03200051 ER PT J AU RITTER, JA BARRICK, JDW WATSON, CE SACHSE, GW GREGORY, GL ANDERSON, BE WOERNER, MA COLLINS, JE AF RITTER, JA BARRICK, JDW WATSON, CE SACHSE, GW GREGORY, GL ANDERSON, BE WOERNER, MA COLLINS, JE TI AIRBORNE BOUNDARY-LAYER FLUX MEASUREMENTS OF TRACE SPECIES OVER CANADIAN BOREAL FOREST AND NORTHERN WETLAND REGIONS SO JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES LA English DT Article ID CARBON-MONOXIDE; CHEMISTRY; DYNAMICS; BUDGET AB Airborne heat, moisture, O-3 CO, and CH4 flux measurements were obtained over the Hudson Bay lowlands (HBL) and northern boreal forest regions of Canada during July-August 1990. The airborne flux measurements were an integral part of the NASA/Arctic Boundary Layer Expedition (ABLE) 3B field experiment executed in collaboration with the Canadian Northern Wetlands Study (NOWES). Airborne CH4 flux measurements were taken over a large portion of the HBL. The surface level flux of CH4 was obtained from downward extrapolations of multiple-level CH4 flux measurements, Methane source strengths ranged from -1 to 31 mg m(-2) d(-1), with the higher values occurring in relatively small, isolated areas. Similar measurements of the CH4 source strength in the boreal forest region of Schefferville, Quebec, ranged from 6 to 27 mg m(-2) d(-1) and exhibited a diurnal dependence. The CH4 source strengths found during the ABLE 3B expedition were much lower than the seasonally averaged source strength of 51 mg m(-2) d(-1) found for the Yukon-Kuskokwim delta region of Alaska during the previous ABLE 3A study. Large positive CO fluxes (0.31 to 0.53 parts per billion by volume (ppbv) m s(-1)) were observed over the inland, forested regions of the HBL study area, although the mechanism for the generation of these fluxes was not identified. Repetitive measurements along the same ground track at various times of day near the Schefferville site also suggested a diurnal dependence for CO emissions. Measurements of surface resistance to the uptake of O-3 (1.91 to 0.80 s cm(-1)) for the HBL areas investigated were comparable to those observed near the Schefferville site (3.40 to 1.10 s cm(-1)), Surface resistance values for the ABLE 3B study area were somewhat less than those observed over the Yukon-Kuskokwim delta during the previous ABLE 3A study. The budgets for heat, moisture O-3, CO, and CH4 were evaluated. The residuals from these budget studies indicated, for the cases selected, a moderate net photochemical production of O-3 present in the boundary layer over the HBL that coincided with an in situ destruction of CO, although the mechanism responsible for the destruction of CO was not identified. Results from the O-3, budget analysis indicate the importance of in situ photochemical production and its possible dominance over surface deposition to the local O-3 budget at the Schefferville site. Measurements of the in situ production of O-3 indicated a direct relationship between the presence of biomass burning or large scale pollution effects. Residuals from budget calculations for conserved quantities (heat, moisture, and CH4) were compared with their respective surface fluxes to provide a measure of the internal self consistency of the flux measurements. C1 SCI & TECHNOL CORP, HAMPTON, VA 23666 USA. NASA, LANGLEY RES CTR, DIV FLIGHT ELECTR, HAMPTON, VA 23665 USA. RP RITTER, JA (reprint author), NASA, LANGLEY RES CTR, DIV ATMOSPHER SCI, HAMPTON, VA 23665 USA. NR 47 TC 31 Z9 31 U1 2 U2 3 PU AMER GEOPHYSICAL UNION PI WASHINGTON PA 2000 FLORIDA AVE NW, WASHINGTON, DC 20009 USA SN 2169-897X J9 J GEOPHYS RES-ATMOS JI J. Geophys. Res.-Atmos. PD JAN 20 PY 1994 VL 99 IS D1 BP 1671 EP 1685 DI 10.1029/93JD01859 PG 15 WC Meteorology & Atmospheric Sciences SC Meteorology & Atmospheric Sciences GA MT032 UT WOS:A1994MT03200052 ER PT J AU LEFER, BL TALBOT, RW HARRISS, RC BRADSHAW, JD SANDHOLM, ST OLSON, JO SACHSE, GW COLLINS, J SHIPHAM, MA BLAKE, DR KLEMM, KI KLEMM, O GORZELSKA, K BARRICK, J AF LEFER, BL TALBOT, RW HARRISS, RC BRADSHAW, JD SANDHOLM, ST OLSON, JO SACHSE, GW COLLINS, J SHIPHAM, MA BLAKE, DR KLEMM, KI KLEMM, O GORZELSKA, K BARRICK, J TI ENHANCEMENT OF ACIDIC GASES IN BIOMASS BURNING IMPACTED AIR MASSES OVER CANADA SO JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES LA English DT Article ID ATMOSPHERIC CHEMISTRY; TROPOSPHERE; EMISSIONS; AMAZONIA; SEASON; HNO3 AB Biomass-burning impacted air masses sampled over central and eastern Canada during the summer of 1990 as part of ABLE 3B contained enhanced mixing ratios of gaseous HNO3, HCOOH, CH3COOH, and what appears to be (COOH)(2). These aircraft-based samples were collected from a variety of fresh burning plumes and more aged haze layers from different source regions. Values of the enhancement factor, Delta X/Delta CO, where X represents an acidic gas, for combustion-impacted air masses sampled both near and farther away from the fires, were relatively uniform. However, comparison of carboxylic acid emission ratios measured in laboratory fires to field plume enhancement factors indicates significant in-plume production of HCOOH. Biomass-burning appears to be an important source of HNO3, HCOOH, and CH3COOH to the troposphere over subarctic Canada. C1 NASA, LANGLEY RES CTR, HAMPTON, VA 23665 USA. UNIV CALIF IRVINE, DEPT CHEM, IRVINE, CA 92717 USA. GEORGIA INST TECHNOL, SCH EARTH & ATMOSPHER SCI, ATLANTA, GA 30332 USA. RP LEFER, BL (reprint author), UNIV NEW HAMPSHIRE, INST STUDY EARTH OCEANS & SPACE, DURHAM, NH 03824 USA. RI Lefer, Barry/B-5417-2012 OI Lefer, Barry/0000-0001-9520-5495 NR 50 TC 66 Z9 69 U1 1 U2 8 PU AMER GEOPHYSICAL UNION PI WASHINGTON PA 2000 FLORIDA AVE NW, WASHINGTON, DC 20009 USA SN 2169-897X J9 J GEOPHYS RES-ATMOS JI J. Geophys. Res.-Atmos. PD JAN 20 PY 1994 VL 99 IS D1 BP 1721 EP 1737 DI 10.1029/93JD02091 PG 17 WC Meteorology & Atmospheric Sciences SC Meteorology & Atmospheric Sciences GA MT032 UT WOS:A1994MT03200055 ER PT J AU BROWELL, EV FENN, MA BUTLER, CF GRANT, WB HARRISS, RC SHIPHAM, MC AF BROWELL, EV FENN, MA BUTLER, CF GRANT, WB HARRISS, RC SHIPHAM, MC TI OZONE AND AEROSOL DISTRIBUTIONS IN THE SUMMERTIME TROPOSPHERE OVER CANADA SO JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES LA English DT Article ID INSITU MEASUREMENTS; TRANSPORT; MECHANISM; PROFILES; LIDAR AB Measurements of ozone (O-3) and aerosol distributions were made with an airborne lidar system in the lowland and boreal forest regions of eastern Canada during July-August 1990 as part of the NASA Global Tropospheric Experiment/Arctic Boundary Layer Expedition (ABLE) 3B. Aerosol and O-3 profiles were measured simultaneously above and below the Electra aircraft from near the surface to above the tropopause on long-range flights over these important ecosystems. A broad range of atmospheric conditions were encountered during repeated flights over intensive study sites in the Hudson Bay lowlands near Moosonee, Ontario, and over the boreal forest near Schefferville, Quebec. The tropospheric composition in this high-latitude region was found to be strongly influenced by stratospheric intrusions. Regions of low aerosol scattering and enhanced O-3 mixing ratios were correlated with descending air from the lower stratosphere. Over 33% of the troposphere (0-12 km) along our flight track at latitudes from about 45 degrees to 55 degrees N had significantly enhanced O-3 due to stratospheric intrusions, and in the middle to upper troposphere the extent of the enhanced O-3 generally exceeded 40%. Ozone mixing ratios of 80 parts per billion by volume (ppbv) near 6 km were common in strong intrusions. In the boundary layer over the lowlands O-3 was in the 20-30 ppbv range with a vertical O-3 gradient of 6.7 ppbv km(-1) to about 45 ppbv at 3 km. Above 6 km the background tropospheric O-3 profile was nearly constant with an average value of 53 ppbv. Due to forest fires in Canada and Alaska, plumes from biomass-burning sources were observed on many flights. Biomass-burning plumes influenced about 25% of the free troposphere below 4 km, and in some of the plumes, O-3 was enhanced by 10-20 ppbv over ambient levels of 30-45 ppbv. Several air masses transported from the tropical Pacific were observed over Canada in the middle to upper troposphere with O-3 levels 10-20 ppbv below background values of 50-55 ppbv. C1 SCI APPLICAT INT CORP, HAMPTON, VA 23666 USA. UNIV NEW HAMPSHIRE, INST STUDY EARTH OCEANS & SPACE, DURHAM, NH 03824 USA. RP BROWELL, EV (reprint author), NASA, LANGLEY RES CTR, DIV ATMOSPHER SCI, HAMPTON, VA 23681 USA. RI Grant, William/B-8311-2009 OI Grant, William/0000-0002-1439-3285 NR 25 TC 51 Z9 51 U1 0 U2 5 PU AMER GEOPHYSICAL UNION PI WASHINGTON PA 2000 FLORIDA AVE NW, WASHINGTON, DC 20009 USA SN 2169-897X J9 J GEOPHYS RES-ATMOS JI J. Geophys. Res.-Atmos. PD JAN 20 PY 1994 VL 99 IS D1 BP 1739 EP 1755 DI 10.1029/93JD01832 PG 17 WC Meteorology & Atmospheric Sciences SC Meteorology & Atmospheric Sciences GA MT032 UT WOS:A1994MT03200056 ER PT J AU GREGORY, GL ANDERSON, BE BARRICK, JD HUDGINS, CH BAGWELL, DR BLAKE, DR AF GREGORY, GL ANDERSON, BE BARRICK, JD HUDGINS, CH BAGWELL, DR BLAKE, DR TI ANALYSIS OF TROPOSPHERIC AEROSOL NUMBER DENSITY FOR AEROSOLS OF 0.2-MU-M TO 3-MU-M DIAMETER - CENTRAL AND NORTHEASTERN CANADA SO JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES LA English DT Article ID RESPONSE CHARACTERISTICS; TRANSPORT; COUNTERS; OZONE AB NASA's Atmospheric Boundary Layer Experiment conducted during the summer of 1990 focused on the distribution of trace species in central and northeastern Canada (altitudes <6 km) and the importance of surface sources/sinks, local emissions, distant transport, tropospheric/stratospheric exchange. Aircraft flights were based from North Bay, Ontario, and Goose Bay, Labrador, Canada. As part of the aircraft measurements, aerosol number density (0.2- to 3-mu m diameter) was measured using an optical laser technique. Results show that summertime aerosol budgets of central and northeastern Canada can be significantly impacted by the transport of pollutants from distant source regions. Biomass burning in Alaska and western and central Canada exerts major influences on regional aerosol budgets. Urban emissions transported from the U.S./Canadian border regions are also important. Aerosol enhancements (mixed layer and free troposphere) were most prevalent in air with carbon monoxide mixing ratios >110 parts per billion by volume (ppbv). When data were grouped as to the source of the air (5-day back trajectories) either north or south of the polar jet, aerosol number density in the mixed layer showed a tendency to be enhanced for air south of the jet relative to north of the jet. However, this difference was not observed for measurements at the higher altitudes (4 to 6 km). For some flights, mixed layer aerosol number densities were >100 higher than free-tropospheric values (3- to 6-km altitude). The majority of the observed mixed layer enhancement was associated with transport of effluent-rich air into the Canadian regions. Aerosol emissions from natural Canadian ecosystems were relatively small when compared to transport. C1 NASA, LANGLEY RES CTR, DIV OPERAT SUPPORT, HAMPTON, VA 23681 USA. UNIV CALIF IRVINE, DEPT CHEM, IRVINE, CA 92664 USA. RP GREGORY, GL (reprint author), NASA, LANGLEY RES CTR, DIV ATMOSPHER SCI, HAMPTON, VA 23681 USA. NR 19 TC 4 Z9 4 U1 0 U2 0 PU AMER GEOPHYSICAL UNION PI WASHINGTON PA 2000 FLORIDA AVE NW, WASHINGTON, DC 20009 USA SN 2169-897X J9 J GEOPHYS RES-ATMOS JI J. Geophys. Res.-Atmos. PD JAN 20 PY 1994 VL 99 IS D1 BP 1757 EP 1762 DI 10.1029/93JD00103 PG 6 WC Meteorology & Atmospheric Sciences SC Meteorology & Atmospheric Sciences GA MT032 UT WOS:A1994MT03200057 ER PT J AU GORZELSKA, K TALBOT, RW KLEMM, K LEFER, B KLEMM, O GREGORY, GL ANDERSON, B BARRIE, LA AF GORZELSKA, K TALBOT, RW KLEMM, K LEFER, B KLEMM, O GREGORY, GL ANDERSON, B BARRIE, LA TI CHEMICAL-COMPOSITION OF THE ATMOSPHERIC AEROSOL IN THE TROPOSPHERE OVER THE HUDSON-BAY LOWLANDS AND QUEBEC-LABRADOR REGIONS OF CANADA SO JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES LA English DT Article ID FOREST-FIRE SMOKE; VERTICAL-DISTRIBUTION; ARCTIC HAZE; AIR-POLLUTION; ICE-CORE; CHEMISTRY; GASES; PRECIPITATION; COMPONENTS; EMISSIONS AB Atmospheric aerosols were collected in the boundary layer and free troposphere over continental and coastal subarctic regions of Canada during the July-August 1990 joint U.S.-Canadian Arctic Boundary Layer Expedition (ABLE) 3B/Northern Wetlands Study (NOWES). The samples were analyzed for the following water soluble species: Sulfate, nitrate, ammonium, potassium, sodium, chloride, oxalate, methylsulfonate, and total amine nitrogen. Ammonium and sulfate were the major water soluble components of these aerosols. The nearly neutral (overall) chemical composition of summertime aerosol particles contrasts their strongly acidic wintertime composition. Aerosol samples were separated into several air mass categories and characterized in terms of chemical composition, associated mixing ratios of gaseous compounds, and meteorological parameters. The fundamental category represented particles associated with ''background'' air masses. The summertime atmospheric aerosols in background air over the North American subarctic and Arctic regions were characterized by relatively small and spatially uniform mixing ratios of the measured species. These aerosol particles were aged to the extent that they had lost their primary source signature. The chemical profile of the background air aerosols was frequently modified by additions from biomass fire plumes, aged tropical marine air, and intrusions of upper tropospheric/lower stratospheric air. Aerosols in boundary layer background air over the boreal forested region of Quebec-Labrador had significantly larger mixing ratios of ammonium and sulfate relative to the Hudson Bay region. This may reflect infiltration of anthropogenic pollution or be due to natural emissions from this region. C1 NASA, LANGLEY RES CTR, HAMPTON, VA 23665 USA. ENVIRONM CANADA, ATMOSPHER ENVIRONM SERV, DOWNSVIEW M3H 5T4, ON, CANADA. RP GORZELSKA, K (reprint author), UNIV NEW HAMPSHIRE, INST STUDY EARTH OCEANS & SPACE, COMPLEX SYST RES CTR, DURHAM, NH 03824 USA. RI Lefer, Barry/B-5417-2012 OI Lefer, Barry/0000-0001-9520-5495 NR 71 TC 33 Z9 33 U1 1 U2 9 PU AMER GEOPHYSICAL UNION PI WASHINGTON PA 2000 FLORIDA AVE NW, WASHINGTON, DC 20009 USA SN 2169-897X J9 J GEOPHYS RES-ATMOS JI J. Geophys. Res.-Atmos. PD JAN 20 PY 1994 VL 99 IS D1 BP 1763 EP 1779 DI 10.1029/93JD02090 PG 17 WC Meteorology & Atmospheric Sciences SC Meteorology & Atmospheric Sciences GA MT032 UT WOS:A1994MT03200058 ER PT J AU ANDERSON, BE GREGORY, GL BARRICK, JDW COLLINS, JE SACHSE, GW SHIPHAM, MC HUDGINS, CH AF ANDERSON, BE GREGORY, GL BARRICK, JDW COLLINS, JE SACHSE, GW SHIPHAM, MC HUDGINS, CH TI SUMMERTIME TROPOSPHERIC OZONE DISTRIBUTIONS OVER CENTRAL AND EASTERN CANADA SO JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES LA English DT Article AB Ozone measurements were obtained between the surface and the 6-km altitude on aircraft flights over central and eastern Canada during the summer 1990 NASA Global Tropospheric Experiment Arctic Boundary Layer Expedition (GTE/ABLE 3B). Tropospheric O-3 budgets for these regions were observed to be highly variable and significantly impacted by long-range transport and regional scale air mass modification processes. For example, integrated O-3 abundance below 5-km altitude averaged 40% and 30% greater in air masses influenced by anthropogenic sources and biomass burning, respectively, than in background (polar) air. Conversely, aged air transported from subtropical areas of the Pacific at times reduced O, abundance in this height interval by up to 20%. Though intrusion of anthropogenic air was infrequent during the experiment period, the influence of biomass-burning emissions was particularly notable as two thirds of the flights sampled air influenced by plumes from fires burning in Alaska and western Canada. The impinging pollution, both natural and anthropogenic, not only elevated O-3 levels directly but also was a source of reactive nitrogen (and nonmethane hydrocarbons) which generally increases the tropospheric lifetime of O-3 via moderation of photochemical destruction rates. C1 STC CORP, HAMPTON, VA 23666 USA. NASA, LANGLEY RES CTR, DIV OPERAT SUPPORT, HAMPTON, VA 23681 USA. NASA, LANGLEY RES CTR, DIV FLIGHT ELECTR, HAMPTON, VA 23681 USA. RP ANDERSON, BE (reprint author), NASA, LANGLEY RES CTR, DIV ATMOSPHER SCI, HAMPTON, VA 23681 USA. NR 32 TC 25 Z9 25 U1 1 U2 2 PU AMER GEOPHYSICAL UNION PI WASHINGTON PA 2000 FLORIDA AVE NW, WASHINGTON, DC 20009 USA SN 2169-897X J9 J GEOPHYS RES-ATMOS JI J. Geophys. Res.-Atmos. PD JAN 20 PY 1994 VL 99 IS D1 BP 1781 EP 1792 DI 10.1029/93JD00719 PG 12 WC Meteorology & Atmospheric Sciences SC Meteorology & Atmospheric Sciences GA MT032 UT WOS:A1994MT03200059 ER PT J AU BACHMEIER, AS SHIPHAM, MC BROWELL, EV GRANT, WB KLASSA, JM AF BACHMEIER, AS SHIPHAM, MC BROWELL, EV GRANT, WB KLASSA, JM TI STRATOSPHERIC/TROPOSPHERIC EXCHANGE AFFECTING THE NORTHERN WETLANDS REGIONS OF CANADA DURING SUMMER 1990 SO JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES LA English DT Article ID LOWER TROPOSPHERE; TROPOPAUSE FOLD; GROUND-LEVEL; OZONE; CONSTITUENTS; STRATOSPHERE; INTRUSIONS AB The Arctic Boundary Layer Expedition (ABLE) 3B was conducted over the northern wetlands region of Canada during July and August 1990. Several stratospheric/tropospheric exchange events were noted by zenith-looking airborne lidar and in situ measurements of ozone and other trace gas species. Isentropic trajectories and potential vorticity analyses are utilized to determine the frequency of stratospheric inputs which would have affected the tropospheric column over the Moosonee and Schefferville regions and to describe the favored pathways of transport of stratospheric air arriving at these locations. At the 310 K potential temperature level (middle troposphere), trajectories having ''aged stratospheric'' values of potential vorticity at some point in their 5-day history arrived at Moosonee or Schefferville roughly 40% of the time during the ABLE 3B study period, most often via large-scale subsidence enroute from ''stratospheric input regions'' over the Arctic Ocean or northern and central Canada. At 325 K (upper troposphere), ''fresh'' stratospheric input was evident on about 80% of the trajectories, most often associated with jet streaks within the polar and Arctic jet streams. A case study is presented which illustrates both of these general stratospheric input processes. C1 NASA, LANGLEY RES CTR, DIV ATMOSPHER SCI, HAMPTON, VA 23681 USA. COLL WILLIAM & MARY, WILLIAMSBURG, VA USA. RP BACHMEIER, AS (reprint author), LOCKHEED ENGN & SCI CO, HAMPTON, VA 23666 USA. RI Grant, William/B-8311-2009 OI Grant, William/0000-0002-1439-3285 NR 32 TC 24 Z9 24 U1 0 U2 1 PU AMER GEOPHYSICAL UNION PI WASHINGTON PA 2000 FLORIDA AVE NW, WASHINGTON, DC 20009 USA SN 2169-897X J9 J GEOPHYS RES-ATMOS JI J. Geophys. Res.-Atmos. PD JAN 20 PY 1994 VL 99 IS D1 BP 1793 EP 1804 DI 10.1029/93JD02179 PG 12 WC Meteorology & Atmospheric Sciences SC Meteorology & Atmospheric Sciences GA MT032 UT WOS:A1994MT03200060 ER PT J AU SINGH, HB OHARA, D HERLTH, D SACHSE, W BLAKE, DR BRADSHAW, JD KANAKIDOU, M CRUTZEN, PJ AF SINGH, HB OHARA, D HERLTH, D SACHSE, W BLAKE, DR BRADSHAW, JD KANAKIDOU, M CRUTZEN, PJ TI ACETONE IN THE ATMOSPHERE - DISTRIBUTION, SOURCES, AND SINKS SO JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES LA English DT Article ID ORGANIC-COMPOUND EMISSIONS; LOWER STRATOSPHERE; CARBONYL-COMPOUNDS; TROPOSPHERE; GAS; HYDROCARBONS; ACETALDEHYDE; OXIDATION AB Acetone (CH3COCH3) was found to be the dominant nonmethane organic species present in the atmosphere sampled primarily over eastern Canada 0-6 km, 35 degrees-65 degrees N) during ABLE3B (July to August 1990). A concentration range of 357 to 2310 ppt (=10(-12) v/v) with a mean value of 1140 +/- 413 ppt was measured. Under extremely clean conditions, generally involving Arctic flows, lowest (background) mixing ratios of 550 +/- 100 ppt were present in much of the troposphere studied. Correlations between atmospheric mixing ratios of acetone and select species such as C2H2, CO, C3H8, C2Cl4 and isoprene provided important clues to its possible Sources and to the causes of its atmospheric variability. Biomass burning as a source of acetone has been identified for the first time. By using atmospheric data and three-dimensional photochemical models, a global acetone source of 40-60 Tg (=10(12) g)/yr is g)/yr is estimated to be present. Secondary formation from the atmospheric oxidation of precursor hydrocarbons (principally propane, isobutane, and isobutene) provides the single largest source (51%). The remainder is attributable to biomass burning (26%), direct biogenic emissions (21%), and primary anthropogenic emissions (3%). Atmospheric removal of acetone is estimated to be due to photolysis (64%), reaction with OH radicals (24%), and deposition (12%). Model calculations also suggest that acetone photolysis contributed significantly to PAN formation (100-200 ppt) in the middle and upper troposphere of the sampled region and may be important globally. While the source-sink equation appears to be roughly balanced, much more atmospheric and source data, especially from the southern hemisphere, are needed to reliably quantify the atmospheric budget of acetone. C1 UNIV CALIF IRVINE, IRVINE, CA 92717 USA. GEORGIA INST TECHNOL, ATLANTA, GA 30332 USA. MAX PLANCK INST CHEM, W-6500 MAINZ, GERMANY. CTR FAIBLES RADIOACT, LAB MIXTE CNRS CEA, F-91198 GIF SUR YVETTE, FRANCE. SAN JOSE STATE UNIV FDN, MOFFETT FIELD, CA 94035 USA. NASA, LANGLEY RES CTR, HAMPTON, VA 23665 USA. RP SINGH, HB (reprint author), NASA, AMES RES CTR, MOFFETT FIELD, CA 94035 USA. RI Kanakidou, Maria/D-7882-2012; Crutzen, Paul/F-6044-2012 OI Kanakidou, Maria/0000-0002-1724-9692; NR 41 TC 258 Z9 264 U1 2 U2 37 PU AMER GEOPHYSICAL UNION PI WASHINGTON PA 2000 FLORIDA AVE NW, WASHINGTON, DC 20009 USA SN 2169-897X J9 J GEOPHYS RES-ATMOS JI J. Geophys. Res.-Atmos. PD JAN 20 PY 1994 VL 99 IS D1 BP 1805 EP 1819 DI 10.1029/93JD00764 PG 15 WC Meteorology & Atmospheric Sciences SC Meteorology & Atmospheric Sciences GA MT032 UT WOS:A1994MT03200061 ER PT J AU SINGH, HB HERLTH, D OHARA, D ZAHNLE, K BRADSHAW, JD SANDHOLM, ST TALBOT, R GREGORY, GL SACHSE, GW BLAKE, DR WOFSY, SC AF SINGH, HB HERLTH, D OHARA, D ZAHNLE, K BRADSHAW, JD SANDHOLM, ST TALBOT, R GREGORY, GL SACHSE, GW BLAKE, DR WOFSY, SC TI SUMMERTIME DISTRIBUTION OF PAN AND OTHER REACTIVE NITROGEN SPECIES IN THE NORTHERN HIGH-LATITUDE ATMOSPHERE OF EASTERN CANADA SO JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES LA English DT Article ID PEROXYACETYL NITRATE PAN; UNPOLLUTED ATMOSPHERE; ORGANIC NITRATES; UNITED-STATES; TROPOSPHERE; CHEMISTRY; POLLUTION; OXIDATION; OXIDES; HNO3 AB Aircraft measurements of key reactive nitrogen species (NO, NO2, HNO3, PAN, PPN, NO3-, NOy), C-1 to C-6 hydrocarbons acetone, O-3, chemical tracers (C2Cl4, CO), and important meteorological parameters were performed over eastern Canada during Jury to August 1990 at altitudes between 0 and 6 km as part of an Arctic Boundary Layer Expedition (ABLE3B). In the free troposphere, PAN was found to be the single most abundant reactive nitrogen species constituting a major fraction of NOy and was significantly more abundant than NOx and HNO3 PAN and O-3 were well correlated both in their fine and gross structures. Compared to data previously collected in the Arctic/subarctic atmosphere over Alaska (ABLE3A), the lower troposphere (0-4 km) over eastern Canada was found to contain larger reactive nitrogen and anthropogenic tracer concentrations. At higher altitudes (4-6 km) the atmospheric composition was in many ways similar to what was seen over Alaska and supports the view that a large-scale reservoir of PAN (and NOy) is present in the upper troposphere over the entire Arctic/subarctic region. The reactive nitrogen budget based on missions conducted from the North Bay site (missions 2-10) showed a small shortfall, whereas the budget for data collected from the Goose Bay operation (missions 11-19) showed essential balance. It is calculated that 15-20 ppt of the observed NOx find its source from the available PAN reservoir. Meteorological considerations as well as relationships between reactive nitrogen and tracer species suggest that the atmosphere over eastern Canada during summer is greatly influenced by forest fires and transported industrial pollution. C1 UNIV CALIF IRVINE, IRVINE, CA 92717 USA. GEORGIA INST TECHNOL, ATLANTA, GA 30332 USA. NASA, LANGLEY RES CTR, HAMPTON, VA 23665 USA. SAN JOSE STATE UNIV FDN, MOFFETT FIELD, CA 94035 USA. UNIV NEW HAMPSHIRE, DURHAM, NH 03824 USA. HARVARD UNIV, CAMBRIDGE, MA 02138 USA. RP SINGH, HB (reprint author), NASA, AMES RES CTR, MOFFETT FIELD, CA 94035 USA. NR 42 TC 61 Z9 61 U1 1 U2 2 PU AMER GEOPHYSICAL UNION PI WASHINGTON PA 2000 FLORIDA AVE NW, WASHINGTON, DC 20009 USA SN 2169-897X J9 J GEOPHYS RES-ATMOS JI J. Geophys. Res.-Atmos. PD JAN 20 PY 1994 VL 99 IS D1 BP 1821 EP 1835 DI 10.1029/93JD00946 PG 15 WC Meteorology & Atmospheric Sciences SC Meteorology & Atmospheric Sciences GA MT032 UT WOS:A1994MT03200062 ER PT J AU SANDHOLM, S OLSON, J BRADSHAW, J TALBOT, R SINGH, H GREGORY, G BLAKE, D ANDERSON, B SACHSE, G BARRICK, J COLLINS, J KLEMM, K LEFER, B KLEMM, O GORZELSKA, K HERLTH, D OHARA, D AF SANDHOLM, S OLSON, J BRADSHAW, J TALBOT, R SINGH, H GREGORY, G BLAKE, D ANDERSON, B SACHSE, G BARRICK, J COLLINS, J KLEMM, K LEFER, B KLEMM, O GORZELSKA, K HERLTH, D OHARA, D TI SUMMERTIME PARTITIONING AND BUDGET OF NOY COMPOUNDS IN THE TROPOSPHERE OVER ALASKA AND CANADA - ABLE 3B SO JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES LA English DT Article ID PEROXYACETYL NITRATE PAN; ODD-NITROGEN NOY; CARBON-MONOXIDE; REACTIVE NITROGEN; UNITED-STATES; NITRIC-OXIDE; UNPOLLUTED ATMOSPHERE; OXIDIZED NITROGEN; ORGANIC NITRATES; OZONE PRODUCTION AB As part of NASA's Arctic Boundary Layer Expedition 3A and 3B field measurement programs, measurements of NOx, HNO3, PAN, PPN, and NOy were made in the middle to lower troposphere over Alaska and Canada during the summers of 1988 and 1990. These measurements are used to assess the degree of closure within the reactive odd nitrogen (N-x O-y) budget through the comparison of the values of NOy measured with a catalytic convertor to the sum of individually measured NOy(i) compounds (i.e., Sigma NOy(i) = NOx + HNO3 + PAN + PPN). Significant differences were observed between the various study regions. In the lower 6 km of the troposphere over Alaska and the Hudson Bay lowlands of Canada a significant fraction of the NOy budget (30 to 60%) could not be accounted for by the measured Sigma NOy(i). This deficit in the NOy budget is about 100 to 200 parts per trillion by volume (pptv) in the lower troposphere (0.15 to 3 km) and about 200 to 400 pptv in the middle free troposphere (3 to 6.2 km). Conversely, the NOy budget in the northern Labrador and Quebec regions of Canada is almost totally accounted for within the combined measurement uncertainties of NOy and the various NOy(i) compounds. A substantial portion of the NOy budget's ''missing compounds'' appears to be coupled to the photochemical and/or dynamical parameters Influencing the tropospheric oxidative potential over these regions. A combination of factors are suggested as the causes for the variability observed in the NO budget. In addition, the apparent stability of compounds represented by the NOy budget deficit in the lower-altitude range questions the ability of these compounds to participate as reversible reservoirs for ''active'' odd nitrogen and suggest that some portion of the NOy budget may consist of relatively unreactive nitrogen-containing compounds. C1 NASA, LANGLEY RES CTR, HAMPTON, VA 23665 USA. UNIV CALIF IRVINE, DEPT CHEM, IRVINE, CA 92717 USA. UNIV NEW HAMPSHIRE, INST STUDY EARTH OCEANS & SPACE, DURHAM, NH 03824 USA. NASA, AMES RES CTR, MOFFETT FIELD, CA 94035 USA. RP SANDHOLM, S (reprint author), GEORGIA INST TECHNOL, SCH EARTH & ATMOSPHER SCI, ATLANTA, GA 30332 USA. RI Lefer, Barry/B-5417-2012 OI Lefer, Barry/0000-0001-9520-5495 NR 56 TC 59 Z9 59 U1 0 U2 3 PU AMER GEOPHYSICAL UNION PI WASHINGTON PA 2000 FLORIDA AVE NW, WASHINGTON, DC 20009 USA SN 2169-897X J9 J GEOPHYS RES-ATMOS JI J. Geophys. Res.-Atmos. PD JAN 20 PY 1994 VL 99 IS D1 BP 1837 EP 1861 DI 10.1029/93JD02458 PG 25 WC Meteorology & Atmospheric Sciences SC Meteorology & Atmospheric Sciences GA MT032 UT WOS:A1994MT03200063 ER PT J AU TALBOT, RW BRADSHAW, JD SANDHOLM, ST SINGH, HB SACHSE, GW COLLINS, J GREGORY, GL ANDERSON, B BLAKE, D BARRICK, J BROWELL, EV KLEMM, KI LEFER, BL KLEMM, O GORZELSKA, K OLSON, J HERLTH, D OHARA, D AF TALBOT, RW BRADSHAW, JD SANDHOLM, ST SINGH, HB SACHSE, GW COLLINS, J GREGORY, GL ANDERSON, B BLAKE, D BARRICK, J BROWELL, EV KLEMM, KI LEFER, BL KLEMM, O GORZELSKA, K OLSON, J HERLTH, D OHARA, D TI SUMMERTIME DISTRIBUTION AND RELATIONS OF REACTIVE ODD NITROGEN SPECIES AND NOY IN THE TROPOSPHERE OVER CANADA SO JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES LA English DT Article ID PEROXYACETYL NITRATE PAN; NITRIC-ACID; UNITED-STATES; RURAL SITE; PHOTOCHEMISTRY; OZONE; STRATOSPHERE; CHEMISTRY; HNO3; HYDROCARBONS AB We report here large-scale features of the distribution of NOx, HNO3, PAN, particle NO3, and NOy in the troposphere from 0.15 to 6 km altitude over central Canada. These measurements were conducted in July-August 1990 from the NASA Wallops Electra aircraft as part of the joint United States-Canadian Arctic Boundary Layer Expedition (ABLE) 3B-Northern Wetlands Study. Our findings show that this region is generally NOx limited, with NOx mixing ratios typically 20-30 parts per trillion by volume (pptv). We found little direct evidence for anthropogenic enhancement of mixing ratios of reactive odd nitrogen species and NOy above those in ''background'' air. Instead, it appears that enhancements in the mixing ratios of these species were primarily due to emissions from several day old or CO-rich-NOx-poor smoldering local biomass-burning fires. NOx mixing ratios in biomass-burning impacted air masses were usually <50 pptv, but those of HNO3 and PAN were typically 100-300 pptv representing a twofold-threefold enhancement over ''background'' air. During our study period, inputs of what appeared to be aged tropical air were a major factor influencing the distribution of reactive odd nitrogen in the midtroposphere over northeastern North America. These air masses were quite depleted in NOy (generally <150 pptv), and a frequent summertime occurrence of such air masses over this region would imply a significant influence on the reactive odd nitrogen budget. Our findings show that the chemical composition of aged air masses over subarctic Canada and those documented in the Arctic during ABLE 3A have strikingly similar chemistries, suggesting large-scale connection between the air masses influencing these regions. C1 NASA, LANGLEY RES CTR, HAMPTON, VA 23665 USA. UNIV CALIF IRVINE, DEPT CHEM, IRVINE, CA 92717 USA. GEORGIA INST TECHNOL, SCH EARTH & ATMOSPHER SCI, ATLANTA, GA 30332 USA. NASA, AMES RES CTR, MOFFETT FIELD, CA 94035 USA. RP TALBOT, RW (reprint author), UNIV NEW HAMPSHIRE, INST STUDY EARTH OCEANS & SPACE, DURHAM, NH 03824 USA. RI Lefer, Barry/B-5417-2012 OI Lefer, Barry/0000-0001-9520-5495 NR 63 TC 23 Z9 23 U1 0 U2 2 PU AMER GEOPHYSICAL UNION PI WASHINGTON PA 2000 FLORIDA AVE NW, WASHINGTON, DC 20009 USA SN 2169-897X J9 J GEOPHYS RES-ATMOS JI J. Geophys. Res.-Atmos. PD JAN 20 PY 1994 VL 99 IS D1 BP 1863 EP 1885 DI 10.1029/93JD01841 PG 23 WC Meteorology & Atmospheric Sciences SC Meteorology & Atmospheric Sciences GA MT032 UT WOS:A1994MT03200064 ER PT J AU WOFSY, SC FAN, SM BLAKE, DR BRADSHAW, JD SANDHOLM, ST SINGH, HB SACHSE, GW HARRISS, RC AF WOFSY, SC FAN, SM BLAKE, DR BRADSHAW, JD SANDHOLM, ST SINGH, HB SACHSE, GW HARRISS, RC TI FACTORS INFLUENCING ATMOSPHERIC COMPOSITION OVER SUB-ARCTIC NORTH-AMERICA DURING SUMMER SO JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES LA English DT Article ID ARCTIC AIR-POLLUTION; ORGANIC-COMPOUNDS; HAZE AB Elevated concentrations of hydrocarbons, CO, and nitrogen oxides were observed in extensive haze layers over northeastern Canada in the summer of 1990, during ABLE 3B. Halocarbon concentrations remained near background in most layers, indicating a source from biomass wildfires. Elevated concentrations of C2Cl4 provided a sensitive indicator for pollution from urban/industrial sources. Detailed analysis of regional budgets for CO and hydrocarbons indicates that biomass fires accounted for approximate to 70% of the input to the subarctic for most hydrocarbons and for acetone and more than 50% for CO. Regional sources for many species (including CO) exceeded chemical sinks during summer, and the boreal region provided a net source to midlatitudes. Interannual variations and long-term trends in atmospheric composition are sensitive to climatic change; a shift to warmer, drier conditions could increase the areas burned and thus the sources of many trace gases. C1 UNIV CALIF IRVINE, DEPT CHEM, IRVINE, CA 92717 USA. GEORGIA INST TECHNOL, SCH EARTH & ATMOSPHER SCI, ATLANTA, GA 30332 USA. HARVARD UNIV, DEPT EARTH & PLANETARY SCI, CAMBRIDGE, MA 02138 USA. UNIV NEW HAMPSHIRE, COMPLEX SYST RES CTR, DURHAM, NH 03814 USA. NASA, LANGLEY RES CTR, HAMPTON, VA 22331 USA. NASA, AMES RES CTR, MOFFETT FIELD, CA 94035 USA. RP WOFSY, SC (reprint author), HARVARD UNIV, DIV APPL SCI, CAMBRIDGE, MA 02138 USA. NR 30 TC 40 Z9 41 U1 1 U2 9 PU AMER GEOPHYSICAL UNION PI WASHINGTON PA 2000 FLORIDA AVE NW, WASHINGTON, DC 20009 USA SN 2169-897X J9 J GEOPHYS RES-ATMOS JI J. Geophys. Res.-Atmos. PD JAN 20 PY 1994 VL 99 IS D1 BP 1887 EP 1897 DI 10.1029/93JD02256 PG 11 WC Meteorology & Atmospheric Sciences SC Meteorology & Atmospheric Sciences GA MT032 UT WOS:A1994MT03200065 ER PT J AU BAKWIN, PS JACOB, DJ WOFSY, SC MUNGER, JW DAUBE, BC BRADSHAW, JD SANDHOLM, ST TALBOT, RW SINGH, HB GREGORY, GL BLAKE, DR AF BAKWIN, PS JACOB, DJ WOFSY, SC MUNGER, JW DAUBE, BC BRADSHAW, JD SANDHOLM, ST TALBOT, RW SINGH, HB GREGORY, GL BLAKE, DR TI REACTIVE NITROGEN-OXIDES AND OZONE ABOVE A TAIGA WOODLAND SO JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES LA English DT Article ID OBSERVATORY PHOTOCHEMISTRY EXPERIMENT; RADIOMETER MEASUREMENTS; PHOTOSTATIONARY STATE; DISTRIBUTIONS; CHEMISTRY; BUDGET; SITE AB Measurements of reactive nitrogen oxides (NOx and NOy) and ozone (03) were made in the planetary boundary layer (PBL) above a taiga woodland in northern Quebec, Canada, during June-August, 1990, as part of NASA Artic Boundary Layer Expedition (ABLE) 3B. Levels of nitrogen oxides and 03 were strongly modulated by the synoptic scale meteorology that brought air from various source regions to the site. Industrial pollution from the Great Lakes region of the U.S. and Canada appears to be a major source for periodic elevation of NOx, NOy, and O-3. We find that NO/NO2 ratios at this site at midday were approximately 50% those expected from a simple photochemical steady state between NCx and O-3, in contrast to our earlier results from the ABLE 3A tundra site. The difference between the taiga and tundra sites is likely due to much larger emissions of biogenic hydrocarbons (particularly isoprene) from the taiga vegetation. Hydrocarbon photooxidation leads to relatively rapid production of peroxy radicals, which convert NO to NO2, at taiga site. Ratios of NOx to NOy were typically 2-3 times higher in the PBL during ABLE 3B than during ABLE 3A. This is probably the result of high PAN levels and suppressed formation of HNO3 from NO2 due to high levels of biogenic hydrocarbons at the ABLE 3B site. C1 UNIV CALIF IRVINE, DEPT CHEM, IRVINE, CA 92717 USA. GEORGIA INST TECHNOL, SCH ATMOSPHER SCI, ATLANTA, GA 30332 USA. HARVARD UNIV, DIV APPL SCI, CAMBRIDGE, MA 02138 USA. NASA, LANGLEY RES CTR, HAMPTON, VA 23665 USA. NASA, AMES RES CTR, MOFFETT FIELD, CA 94035 USA. UNIV NEW HAMPSHIRE, COMPLEX SYST RES CTR, DURHAM, NH 03824 USA. RI Munger, J/H-4502-2013 OI Munger, J/0000-0002-1042-8452 NR 35 TC 21 Z9 21 U1 0 U2 4 PU AMER GEOPHYSICAL UNION PI WASHINGTON PA 2000 FLORIDA AVE NW, WASHINGTON, DC 20009 USA SN 2169-897X J9 J GEOPHYS RES-ATMOS JI J. Geophys. Res.-Atmos. PD JAN 20 PY 1994 VL 99 IS D1 BP 1927 EP 1936 DI 10.1029/93JD02292 PG 10 WC Meteorology & Atmospheric Sciences SC Meteorology & Atmospheric Sciences GA MT032 UT WOS:A1994MT03200068 ER PT J AU SAUBER, J THATCHER, W SOLOMON, SC LISOWSKI, M AF SAUBER, J THATCHER, W SOLOMON, SC LISOWSKI, M TI GEODETIC SLIP RATE FOR THE EASTERN CALIFORNIA SHEAR ZONE AND THE RECURRENCE TIME OF MOJAVE DESERT EARTHQUAKES SO NATURE LA English DT Article ID SAN-ANDREAS FAULT; SOUTHERN-CALIFORNIA; MOTION AB WHERE the San Andreas fault passes along the southwestern margin of the Mojave desert, it exhibits a large change in trend, and the deformation associated with the Pacific/North American plate boundary is distributed broadly over a complex shear zone. The importance of understanding the partitioning of strain across this region, especially to the east of the Mojave segment of the San Andreas in a region known as the eastern California shear zone (ECSZ), was highlighted by the occurrence (on 28 June 1992) of the magnitude 7.3 Landers earthquake in this zone. Here we use geodetic observations in the central Mojave desert to obtain new estimates for the rate and distribution of strain across a segment of the ECSZ, and to determine a coseismic strain drop of approximately 770 murad for the Landers earthquake. From these results we infer a strain energy recharge time of 3,500-5,000 yr for a Landers-type earthquake and a slip rate of approximately 12 mm yr-1 across the faults of the central Mojave. The latter estimate implies that a greater fraction of plate motion than heretofore inferred from geodetic data is accommodated across the ECSZ. C1 US GEOL SURVEY,MENLO PK,CA 94025. CARNEGIE INST WASHINGTON,DEPT TERR MAGNETISM,WASHINGTON,DC 20015. RP SAUBER, J (reprint author), NASA,GODDARD SPACE FLIGHT CTR,GEODYNAM BRANCH,TERR PHYS LAB,GREENBELT,MD 20771, USA. RI Sauber, Jeanne/D-7684-2012 NR 28 TC 114 Z9 114 U1 0 U2 5 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 20 PY 1994 VL 367 IS 6460 BP 264 EP 266 DI 10.1038/367264a0 PG 3 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA MR494 UT WOS:A1994MR49400053 ER PT J AU ASKER, JR AF ASKER, JR TI SCIENTISTS ELATED BY IMAGES FROM REFURBISHED HUBBLE SO AVIATION WEEK & SPACE TECHNOLOGY LA English DT Editorial Material RP ASKER, JR (reprint author), NASA,GODDARD SPACE FLIGHT CTR,GREENBELT,MD 20771, USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU MCGRAW HILL INC PI NEW YORK PA 1221 AVENUE OF THE AMERICAS, NEW YORK, NY 10020 SN 0005-2175 J9 AVIAT WEEK SPACE TEC JI Aviat. Week Space Technol. PD JAN 17 PY 1994 VL 140 IS 3 BP 24 EP 24 PG 1 WC Engineering, Aerospace SC Engineering GA NF331 UT WOS:A1994NF33100010 ER PT J AU WOO, R GOLDSTEIN, RM AF WOO, R GOLDSTEIN, RM TI LATITUDINAL VARIATION OF SPEED AND MASS FLUX IN THE ACCELERATION REGION OF THE SOLAR-WIND INFERRED FROM SPECTRAL BROADENING MEASUREMENTS SO GEOPHYSICAL RESEARCH LETTERS LA English DT Article ID LYMAN-ALPHA OBSERVATIONS; RADIO SCATTERING OBSERVATIONS; POLAR CORONAL HOLE; PIONEER-VENUS; ULTRAVIOLET SPECTROMETER; MARINER-10; MINIMUM AB Spectral broadening measurements conducted at S-band (13-cm wavelength) during solar minimum conditions in the heliocentric distance range of 3-8 R(O) by Mariner 4, Pioneer 10, Mariner 10, Helios 1, Helios 2, and Viking have been combined to reveal a factor of 2.6 reduction in bandwidth from equator to pole. Since spectral broadening bandwidth depends on electron density fluctuation and solar wind speed, and latitudinal variation of the former is available from coherence bandwidth measurements, the remote sensing spectral broadening measurements provide the first determination of the latitudinal variation of solar wind speed in the acceleration region. When combined with electron density measurements deduced from white-light coronagraphs, this result also leads to the first determination of the latitudinal variation of mass flux in the acceleration region. From equator to pole, solar wind speed increases by a factor of 2.2, while mass flux decreases by a factor of 2.3. These results are consistent with measurements of solar wind speed by multi-station intensity scintillation measurements, as well as measurements of mass flux inferred from Lyman alpha observations, both of which pertain to the solar wind beyond 0.5 AU. The spectral broadening observations, therefore, strengthen earlier conclusions about the latitudinal variation of solar wind speed and mass flux, and reinforce current solar coronal models and their implications for solar wind acceleration and solar wind modeling. RP WOO, R (reprint author), CALTECH, JET PROP LAB, MS 238-737, 4800 OAK GROVE DR, PASADENA, CA 91109 USA. NR 31 TC 13 Z9 13 U1 0 U2 0 PU AMER GEOPHYSICAL UNION PI WASHINGTON PA 2000 FLORIDA AVE NW, WASHINGTON, DC 20009 USA SN 0094-8276 J9 GEOPHYS RES LETT JI Geophys. Res. Lett. PD JAN 15 PY 1994 VL 21 IS 2 BP 85 EP 88 DI 10.1029/93GL03389 PG 4 WC Geosciences, Multidisciplinary SC Geology GA MT499 UT WOS:A1994MT49900002 ER PT J AU HERRERO, FA MERIWETHER, JW AF HERRERO, FA MERIWETHER, JW TI THE 630 NM MIG AND THE VERTICAL NEUTRAL WIND IN THE LOW-LATITUDE NIGHTTIME THERMOSPHERE SO GEOPHYSICAL RESEARCH LETTERS LA English DT Article AB It is shown that large negative divergences (gradients) in the horizontal neutral wind in the equatorial thermosphere can support downward neutral winds in excess of 20 m/s. With attention to the meridional and vertical winds only, the pressure tendency equation is used to derive the expression U-z0 approximate to [partial derivative U-y/partial derivative y]H for the vertical wind U-z0 at the reference altitude for the pressure tendency equation; H is the atmospheric density scale height, and [partial derivative U-y/partial derivative y] is the meridional wind gradient. The velocity gradient associated with the Meridional Intensity Gradient (MIG) of the O(D-1) emission (630 nn) at low latitudes is used to estimate the vertical neutral wind in the MIG region. Velocity gradients derived from MIG data are about 0.5 (m/s)/km) or more, indicating that the MIG region may contain downward neutral winds in excess of 20 m/s. Though direct measurements of the vertical wind are scarce, Fabry-Perot interferometer data of the equatorial F-region above Natal, Brazil, showed downward winds of 30 m/s occurring during a strong meridional wind convergence in 1982. In-situ measurements with the WATS instrument on the DE-2 satellite also show large vertical neutral winds in the equatorial region. C1 CLEMSON UNIV,DEPT PHYS & ASTRON,KINARD LAB,CLEMSON,SC 29634. RP HERRERO, FA (reprint author), NASA,GODDARD SPACE FLIGHT CTR,CODE 696,GREENBELT,MD 20771, USA. NR 12 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 JAN 15 PY 1994 VL 21 IS 2 BP 97 EP 100 DI 10.1029/93GL03115 PG 4 WC Geosciences, Multidisciplinary SC Geology GA MT499 UT WOS:A1994MT49900005 ER PT J AU GREEN, S HUTSON, J AF GREEN, S HUTSON, J TI SPECTRAL-LINE SHAPE-PARAMETERS FAR HF IN A BATH OF AR ARE ACCURATELY PREDICTED BY A POTENTIAL INFERRED FROM SPECTRA OF THE VAN-DER-WAALS DIMER SO JOURNAL OF CHEMICAL PHYSICS LA English DT Article ID RAMAN Q-BRANCH; ENERGY SURFACE; INTERMOLECULAR POTENTIALS; SCATTERING CALCULATIONS; VIBRATIONAL DEPENDENCE; FUNDAMENTAL-BAND; SPECTROSCOPY; HCL; HE; MOLECULES AB An interaction potential for Ar-HF, which was recently determined from extensive spectroscopic data. for the van der Waals dimer and which includes dependence on the HF vibrational state, has been used with accurate close-coupling molecular scattering calculations to predict line shape parameters for the pure rotational and the fundamental and first overtone vibrational bands of HF in a bath of Ar. Agreement with experiment is good; in fact, considering inconsistencies among the experimental values; the theoretical values may be the more reliable. This confirms the accuracy of the Ar-HF interaction potential, including the dependence on the HF vibrational level which is sensitively probed by the line shift cross sections. C1 UNIV DURHAM,DEPT CHEM,DURHAM DH1 3LE,ENGLAND. RP GREEN, S (reprint author), NASA,GODDARD SPACE FLIGHT CTR,INST SPACE STUDIES,NEW YORK,NY 10025, USA. RI Hutson, Jeremy/F-4748-2012 OI Hutson, Jeremy/0000-0002-4344-6622 NR 43 TC 58 Z9 60 U1 1 U2 2 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0021-9606 J9 J CHEM PHYS JI J. Chem. Phys. PD JAN 15 PY 1994 VL 100 IS 2 BP 891 EP 898 DI 10.1063/1.466571 PG 8 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA MT007 UT WOS:A1994MT00700014 ER PT J AU BAUSCHLICHER, CW AF BAUSCHLICHER, CW TI AN AB-INITIO STUDY OF CUCO SO JOURNAL OF CHEMICAL PHYSICS LA English DT Article ID GAUSSIAN-BASIS SETS; MOLECULAR CALCULATIONS; COPPER CARBONYLS; MATRIX-ISOLATION; ATOMS; CU(CO)3; 1ST-ROW; CU2(CO)6; ORBITALS AB Modified coupled-pair functional (MCPF) calculations and coupled cluster singles and doubles calculations, which include a perturbational estimate of the connected triples [CCSD(T)], yield a bent structure for CuCO, thus, supporting the prediction of a nonlinear structure based on density functional (DF) calculations. Our best estimate for the:binding energy is 4.9 +/- 1.4 kcal/mol; this is in better agreement with experiment (6.0 +/- 1.2 kcal/mol) than the DF approach which yields a value (19.6 kcal/mol) significantly larger than experiment. RP BAUSCHLICHER, CW (reprint author), NASA, AMES RES CTR, MOFFETT FIELD, CA 94035 USA. NR 31 TC 52 Z9 53 U1 0 U2 3 PU AMER INST PHYSICS PI MELVILLE PA CIRCULATION & FULFILLMENT DIV, 2 HUNTINGTON QUADRANGLE, STE 1 N O 1, MELVILLE, NY 11747-4501 USA SN 0021-9606 J9 J CHEM PHYS JI J. Chem. Phys. PD JAN 15 PY 1994 VL 100 IS 2 BP 1215 EP 1218 DI 10.1063/1.466651 PG 4 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA MT007 UT WOS:A1994MT00700047 ER PT J AU BAUSCHLICHER, CW LANGHOFF, SR PARTRIDGE, H AF BAUSCHLICHER, CW LANGHOFF, SR PARTRIDGE, H TI THE LOW-LYING STATES OF ALCU AND ALAG SO JOURNAL OF CHEMICAL PHYSICS LA English DT Article ID GAUSSIAN-BASIS SETS; GTO BASIS-SETS; RELATIVISTIC CALCULATIONS; MOLECULAR CALCULATIONS; ELECTRON CORRELATION; 2ND-ROW ATOMS; ORBITALS; EXPANSIONS; 1ST-ROW AB The singlet and triplet states of AlCu and AlAg below about 32 000 cm(-1) are studied using the internally contracted multireference configuration-interaction method. A more elaborate study of the X (1) Sigma(+) ground state of AlCu is undertaken using extended Gaussian basis sets, including the effect of inner-shell correlation and including a perturbational estimate of relativistic effects. Our best estimate of the spectroscopic constants (r(0), Delta G(1/2), and D-0) for the X (1) Sigma(+) state with the experimental values in parentheses are: 4.416(4.420) a0, 295(294) cm(-1), and 2.318(2.315) eV. The calculations definitively assign the upper state in the observed transition at 14 892 cm(-1) to the lowest (1) Pi. state. The calculated spectroscopic constants and radiative lifetime for the (1) Pi state are in good agreement with experiment. The calculations support the tentative assignments of Behm et al. for three band systems observed in the visible region between 25 000 and 28 000 cm(-1). However, the computed spectroscopic constants are in very poor agreement with those deduced from an analysis of the spectra. Analogous theoretical results for AlAg suggest that the (2)(3) Pi, (3)(3) Pi, and (3)(1) Sigma(+) states account for the bands observed, but not assigned, by Duncan and co-workers. RP BAUSCHLICHER, CW (reprint author), NASA,AMES RES CTR,MOFFETT FIELD,CA 94035, USA. NR 35 TC 10 Z9 10 U1 1 U2 2 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0021-9606 J9 J CHEM PHYS JI J. Chem. Phys. PD JAN 15 PY 1994 VL 100 IS 2 BP 1219 EP 1225 DI 10.1063/1.466652 PG 7 WC Chemistry, Physical; Physics, Atomic, Molecular & Chemical SC Chemistry; Physics GA MT007 UT WOS:A1994MT00700048 ER PT J AU ZOIA, G STERN, SA STCLAIR, AK PRATT, JR AF ZOIA, G STERN, SA STCLAIR, AK PRATT, JR TI PERMEABILITY RELATIONSHIPS OF POLYIMIDE COPOLYMERS SO JOURNAL OF POLYMER SCIENCE PART B-POLYMER PHYSICS LA English DT Article DE POLYIMIDE COPOLYMERS; GAS PERMEABILITY; 2BDAF SYNTHESIS ID POLYMERS; SEPARATION AB The permeability of the homopolymers 6FDA-3BDAF and 6FDA-4BDAF and of the co-polymers 6FDA-4/2BDAF, 6FDA-4/3BDAF, and 6FDA-4/3/2BDAF to He, CO2, and CH4 WaS measured at 35.0-degrees-C and at pressures up to 10 atm. The experimental values of the permeability coefficients for the copolymers are in satisfactory agreement with the values estimated from the permeability coefficients for the constituent homopolymers and their weight fractions. The synthesis of the fluorine-containing diamine 2BDAF is reported for the first time. (C) 1994 John Wiley & Sons, Inc. C1 SYRACUSE UNIV, DEPT CHEM ENGN & MAT SCI, SYRACUSE, NY 13244 USA. NASA, LANGLEY RES CTR, DIV MAT, HAMPTON, VA 23665 USA. NR 15 TC 33 Z9 33 U1 1 U2 4 PU WILEY-BLACKWELL PI HOBOKEN PA 111 RIVER ST, HOBOKEN 07030-5774, NJ USA SN 0887-6266 EI 1099-0488 J9 J POLYM SCI POL PHYS JI J. Polym. Sci. Pt. B-Polym. Phys. PD JAN 15 PY 1994 VL 32 IS 1 BP 53 EP 58 DI 10.1002/polb.1994.090320107 PG 6 WC Polymer Science SC Polymer Science GA MN432 UT WOS:A1994MN43200007 ER PT J AU REID, MA AF REID, MA TI PROCEEDINGS OF THE 4TH SPACE-ELECTROCHEMICAL-RESEARCH-AND-TECHNOLOGY-CONFERENCE - NASA-LEWIS-RESEARCH-CENTER - CLEVELAND, OH, USA - APRIL 14-15, 1993 - FOREWORD SO JOURNAL OF POWER SOURCES LA English DT Editorial Material RP REID, MA (reprint author), NASA,LEWIS RES CTR,21000 BROOKPK RD,CLEVELAND,OH 44135, USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU ELSEVIER SCIENCE SA LAUSANNE PI LAUSANNE 1 PA PO BOX 564, 1001 LAUSANNE 1, SWITZERLAND SN 0378-7753 J9 J POWER SOURCES JI J. Power Sources PD JAN 15 PY 1994 VL 47 IS 3 BP 221 EP 221 DI 10.1016/0378-7753(94)87001-2 PG 1 WC Chemistry, Physical; Electrochemistry; Energy & Fuels; Materials Science, Multidisciplinary SC Chemistry; Electrochemistry; Energy & Fuels; Materials Science GA MV230 UT WOS:A1994MV23000001 ER PT J AU HABIB, S AF HABIB, S TI AEROSPACE APPLICATIONS OF BATTERIES SO JOURNAL OF POWER SOURCES LA English DT Article; Proceedings Paper CT 4th NASA Space Electrochemical Research and Technology (SERT) Conference CY APR 14-15, 1993 CL NASA LEWIS RES CTR, CLEVELAND, OH SP NASA HO NASA LEWIS RES CTR AB NASA has developed battery technology to meet the demanding requirements for aerospace applications; specifically, the space vacuum, launch loads, and high duty cycles. Because of unique requirements and operating environments associated with space applications, NASA has written its own standards and specifications for batteries. RP HABIB, S (reprint author), NASA HEADQUARTERS,CODE QW,300E ST,SW,WASHINGTON,DC 20546, USA. NR 5 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 0378-7753 J9 J POWER SOURCES JI J. Power Sources PD JAN 15 PY 1994 VL 47 IS 3 BP 225 EP 230 DI 10.1016/0378-7753(94)87002-0 PG 6 WC Chemistry, Physical; Electrochemistry; Energy & Fuels; Materials Science, Multidisciplinary SC Chemistry; Electrochemistry; Energy & Fuels; Materials Science GA MV230 UT WOS:A1994MV23000002 ER PT J AU SMITHRICK, JJ BRITTON, DL AF SMITHRICK, JJ BRITTON, DL TI NASA LEWIS ADVANCED INDIVIDUAL PRESSURE-VESSEL (IPV) NICKEL-HYDROGEN TECHNOLOGY SO JOURNAL OF POWER SOURCES LA English DT Article; Proceedings Paper CT 4th NASA Space Electrochemical Research and Technology (SERT) Conference CY APR 14-15, 1993 CL NASA LEWIS RES CTR, CLEVELAND, OH SP NASA HO NASA LEWIS RES CTR ID NICKEL HYDROGEN CELLS; CYCLE LIFE AB Individual pressure vessel (IPV) nickel/hydrogen technology was advanced at NASA Lewis and under Lewis contracts. Some of the advancements are as follows: (i) to use 26% KOH electrolyte to improve cycle life and performance; (ii) to modify the state-of-the-art cell design to eliminate identified failure modes and further improve cycle life, and (iii) to develop a lightweight nickel electrode to reduce battery mass, hence reduce launch and/or increase satellite payload. A breakthrough in the Low-Earth-Orbit (LEO) cycle life of individual pressure vessel nickel/hydrogen battery cells was reported. The cycle life of boiler plate cells containing 26% KOH electrolyte was about 40 000 accelerated LEO cycles at 80% depth-of-discharge (DOD) compared with 3500 cycles for cells containing 31% KGH. Results of the boiler plate cell tests have been validated at Naval Weapons Support Center, Crane, IN. Forty-eight Ah flight cells containing 26 and 31% KOH have undergone real time LEO cycle life testing at an 80% DOD, 10 degrees C. The three cells containing 26% KOH failed on the average at cycle 19 500. The three cells containing 31% KOH failed on the average at cycle 6400. Validation testing of NASA Lewis 125 Ah advanced design IPV nickel/hydrogen flight cells is also being conducted at Naval Weapons Support Center, Crane, IN under a NASA Lewis contract. This consists of characterization, storage, and cycle-life testing. There was no capacity degradation after 52 days of storage with the cells in the discharged state, on open circuit, 0 degrees C, and a hydrogen pressure of 14.5 psia (1 atm). The catalyzed wall wick cells have been cycled for over 22 694 cycles with no cell failures in the continuing test. All three of the noncatalyzed wall wick cells failed (cycles 9588, 13 900 and 20 575). Cycle-life test results of the Fibrex nickel electrode has demonstrated the feasibility of an improved nickel electrode giving a higher specific energy nickel/hydrogen cell. A nickel/hydrogen boiler plate cell using an 80 mil (2 mm) thick, 90% porous Fibrex nickel electrode has been cycled for 10 000 cycles at 40% DOD. RP SMITHRICK, JJ (reprint author), NASA,LEWIS RES CTR,CLEVELAND,OH 44135, USA. NR 18 TC 0 Z9 0 U1 0 U2 1 PU ELSEVIER SCIENCE SA LAUSANNE PI LAUSANNE 1 PA PO BOX 564, 1001 LAUSANNE 1, SWITZERLAND SN 0378-7753 J9 J POWER SOURCES JI J. Power Sources PD JAN 15 PY 1994 VL 47 IS 3 BP 233 EP 249 DI 10.1016/0378-7753(94)87003-9 PG 17 WC Chemistry, Physical; Electrochemistry; Energy & Fuels; Materials Science, Multidisciplinary SC Chemistry; Electrochemistry; Energy & Fuels; Materials Science GA MV230 UT WOS:A1994MV23000003 ER PT J AU REID, MA AF REID, MA TI IMPEDANCE MEASUREMENTS ON A SPIRAL-WOUND NICKEL METAL HYDRIDE CELL CYCLED IN A SIMULATED LOW-EARTH-ORBIT SO JOURNAL OF POWER SOURCES LA English DT Article; Proceedings Paper CT 4th NASA Space Electrochemical Research and Technology (SERT) Conference CY APR 14-15, 1993 CL NASA LEWIS RES CTR, CLEVELAND, OH SP NASA HO NASA LEWIS RES CTR AB A spiral-wound size C cell was cycled at 25 degrees C in a low earth orbit regime (LEO) at 50% depth-of-discharge (DOD) with approximately 5% overcharge. The nominal capacity was 3.5 Ah. The cell was cycled for 2000 cycles. Capacity checks and impedance measurements over the complete range of state-of-charge were made upon receipt and after 500, 1000 and 2000 cycles. The capacity of the cell was essentially unchanged until after the impedance measurements at 2000 cycles. Only small changes in the impedance parameters were observed, but there was somewhat more scatter in the data after 2000 cycles. When the cell was returned to LEO cycling after 2000 cycles, only 38% of the capacity could be obtained. It is believed that the cell failed because of an equipment failure at the end of the final impedance measurements which allowed an overdischarge. RP REID, MA (reprint author), NASA,LEWIS RES CTR,CLEVELAND,OH 44135, USA. NR 8 TC 5 Z9 5 U1 1 U2 2 PU ELSEVIER SCIENCE SA LAUSANNE PI LAUSANNE 1 PA PO BOX 564, 1001 LAUSANNE 1, SWITZERLAND SN 0378-7753 J9 J POWER SOURCES JI J. Power Sources PD JAN 15 PY 1994 VL 47 IS 3 BP 277 EP 285 DI 10.1016/0378-7753(94)87006-3 PG 9 WC Chemistry, Physical; Electrochemistry; Energy & Fuels; Materials Science, Multidisciplinary SC Chemistry; Electrochemistry; Energy & Fuels; Materials Science GA MV230 UT WOS:A1994MV23000006 ER PT J AU HALPERT, G SURAMPUDI, S SHEN, D HUANG, CK NARAYANAN, S VAMOS, E PERRONE, D AF HALPERT, G SURAMPUDI, S SHEN, D HUANG, CK NARAYANAN, S VAMOS, E PERRONE, D TI STATUS OF THE DEVELOPMENT OF RECHARGEABLE LITHIUM CELLS SO JOURNAL OF POWER SOURCES LA English DT Article; Proceedings Paper CT 4th NASA Space Electrochemical Research and Technology (SERT) Conference CY APR 14-15, 1993 CL NASA LEWIS RES CTR, CLEVELAND, OH SP NASA HO NASA LEWIS RES CTR AB The progress in the development of the ambient temperature lithium-titanium disulfide rechargeable cell under development at the Jet Propulsion Laboratory is described in this paper. Originally aimed at achieving a specific energy of 100 Wh/kg, 'AA' cells have demonstrated 125 Wh/kg at the C/3 discharge rate. The results of evaluating cell design parameters are discussed and cycling test data are also included in the paper. Safety-tests results at various overcharge and overdischarge conditions and rates proved to be uneventful. The test results of cell with built-in overcharge mechanism proved the concept was feasible. Replacing the lithium foil electrode with a LixC resulted in a capacity at 1 mA/cm(2) of 200 mAh/g and 235 mAh/g at 0.167 mA. RP HALPERT, G (reprint author), CALTECH,JET PROP LAB,PASADENA,CA 91109, USA. NR 0 TC 12 Z9 13 U1 0 U2 1 PU ELSEVIER SCIENCE SA LAUSANNE PI LAUSANNE 1 PA PO BOX 564, 1001 LAUSANNE 1, SWITZERLAND SN 0378-7753 J9 J POWER SOURCES JI J. Power Sources PD JAN 15 PY 1994 VL 47 IS 3 BP 287 EP 294 DI 10.1016/0378-7753(94)87007-1 PG 8 WC Chemistry, Physical; Electrochemistry; Energy & Fuels; Materials Science, Multidisciplinary SC Chemistry; Electrochemistry; Energy & Fuels; Materials Science GA MV230 UT WOS:A1994MV23000007 ER PT J AU SURAMPUDI, S NARAYANAN, SR VAMOS, E FRANK, H HALPERT, G LACONTI, A KOSEK, J PRAKASH, GKS OLAH, GA AF SURAMPUDI, S NARAYANAN, SR VAMOS, E FRANK, H HALPERT, G LACONTI, A KOSEK, J PRAKASH, GKS OLAH, GA TI ADVANCES IN DIRECT OXIDATION METHANOL FUEL-CELLS SO JOURNAL OF POWER SOURCES LA English DT Article; Proceedings Paper CT 4th NASA Space Electrochemical Research and Technology (SERT) Conference CY APR 14-15, 1993 CL NASA LEWIS RES CTR, CLEVELAND, OH SP NASA HO NASA LEWIS RES CTR AB Fuel cells that can operate directly on fuels such as methanol are attractive for low to medium power applications in view of their low weight and volume relative to other power sources. A liquid feed direct methanol fuel cell has been developed based on a proton-exchange membrane electrolyte and Pt/Ru and Pt-catalyzed fuel and air/O-2 electrodes, respectively. The cell has been shown to deliver significant power outputs at temperatures of 60 to 90 degrees C. The cell voltage is near 0.5 V at 300 mA/cm(2) current density and an operating temperature of 90 degrees C. A deterrent to performance appears to be methanol crossover through the membrane to the oxygen electrode. Further improvements in performance appear possible by minimizing the methanol crossover rate. C1 GINER INC,WALTHAM,MA 02154. UNIV SO CALIF,LOS ANGELES,CA 90089. RP SURAMPUDI, S (reprint author), CALTECH,JET PROP LAB,PASADENA,CA 91109, USA. NR 5 TC 268 Z9 273 U1 8 U2 37 PU ELSEVIER SCIENCE SA LAUSANNE PI LAUSANNE 1 PA PO BOX 564, 1001 LAUSANNE 1, SWITZERLAND SN 0378-7753 J9 J POWER SOURCES JI J. Power Sources PD JAN 15 PY 1994 VL 47 IS 3 BP 377 EP 385 DI 10.1016/0378-7753(94)87016-0 PG 9 WC Chemistry, Physical; Electrochemistry; Energy & Fuels; Materials Science, Multidisciplinary SC Chemistry; Electrochemistry; Energy & Fuels; Materials Science GA MV230 UT WOS:A1994MV23000016 ER PT J AU FERRIER, BS AF FERRIER, BS TI A DOUBLE-MOMENT MULTIPLE-PHASE 4-CLASS BULK ICE SCHEME .1. DESCRIPTION SO JOURNAL OF THE ATMOSPHERIC SCIENCES LA English DT Article ID MARITIME CUMULIFORM CLOUDS; OBSERVED CONVECTIVE STORMS; NUMERICAL-SIMULATION; PARTICLE CONCENTRATIONS; HAILSTONE GROWTH; MICROPHYSICAL PARAMETERIZATION; PRECIPITATION DEVELOPMENT; SIZE DISTRIBUTIONS; STRATIFORM CLOUDS; MESOSCALE SYSTEMS AB A detailed ice-phase bulk microphysical scheme has been developed for simulating the hydrometeor distributions of convective and stratiform precipitation in different large-scale environmental conditions. The proposed scheme involves 90 distinct microphysical processes, which predict the mixing ratios and the number concentrations of small ice crystals, snow, graupel, and frozen drops/hail, as well as the mixing ratios of liquid water on wet precipitation ice (snow, graupel, frozen drops). The number of adjustable caefficients has been significantly reduced in comparison with other bulk schemes. Additional improvements have been made to the parameterization in the following areas: 1) representing small ice crystals with nonzero terminal fall velocities and dispersive size distributions, 2) accurate and computationally efficient calculations of precipitation collection processes, 3) reformulating the collection equation to prevent unrealistically large accretion rates, 4) more realistic conversion by riming between different classes of precipitation ice, 5) preventing unrealistically large rates of raindrop freezing and freezing of liquid water on ice, 6) detailed treatment of various rime-splintering ice multiplication mechanisms, 7) a simple representation of the Hobbs-Rangno ice enhancement process, 8) aggregation of small ice crystals and snow, and 9) allowing explicit competition between cloud water condensation and ice deposition rates rather than using saturation adjustment techniques. For the purposes of conserving the higher moments of the particle distributions, preserving the spectral widths (or slopes) of the particle spectra is shown to be more important than strict conservation of particle number concentration when parameterizing changes in ice-particle number concentrations due to melting, vapor transfer processes (sublimation of dry ice, evaporation from wet ice), and conversion between different hydrometeor species. The microphysical scheme is incorporated into a nonhydrostatic cloud model in Part II of this study. The model performed well in simulating the radar and microphysical structures of a midlatitude-continental squall line and a tropical-maritime squall system with minimal tuning of the parameterization, even though the vertical profiles of radar reflectivity differed substantially between these storms. RP FERRIER, BS (reprint author), NASA,GODDARD SPACE FLIGHT CTR,UNIV SPACE RES ASSOC,MESOSCALE DYNAM & PRECIPITAT BRANCH,GREENBELT,MD 20771, USA. NR 100 TC 284 Z9 294 U1 4 U2 25 PU AMER METEOROLOGICAL SOC PI BOSTON PA 45 BEACON ST, BOSTON, MA 02108-3693 SN 0022-4928 J9 J ATMOS SCI JI J. Atmos. Sci. PD JAN 15 PY 1994 VL 51 IS 2 BP 249 EP 280 PG 32 WC Meteorology & Atmospheric Sciences SC Meteorology & Atmospheric Sciences GA MT385 UT WOS:A1994MT38500006 ER PT J AU YAU, K YEOMANS, D WEISSMAN, P AF YAU, K YEOMANS, D WEISSMAN, P TI THE PAST AND FUTURE MOTION OF COMET P/SWIFT-TUTTLE SO MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY LA English DT Article DE METHODS, NUMERICAL; CELESTIAL MECHANICS, STELLAR DYNAMICS; COMETS, INDIVIDUAL, P/SWIFT-TUTTLE ID HALLEYS-COMET; EPHEMERIDES AB The orbit of P/Swift-Tuttle is investigated by way of a long-term integration forward to AD 2392 and backward to 703 BC. Two of its previous returns prior to the telescopic period, in AD 188 and 69 BC, are identified in Chinese records. No other observations of P/Swift-Tuttle have been found. The non-gravitational forces that affect the motion of most active comets appear to be negligible for this comet, suggesting that either the comet outgasses radially toward the Sun and in a symmetric fashion about perihelion and/or it is far more massive than periodic comets of comparable activity (e.g. P/Halley). Our successful integration is consistent with all the observed returns of the comet. The unobserved returns between AD 188 and 1737 are easily explained, as the comet did not approach the Earth closely enough to allow naked-eye visibility. Our integration and the observing conditions at each return suggest that the comet has maintained about the same intrinsic brightness for more than two millennia. The lack of non-gravitational effects for this comet and the relative constancy of its intrinsic brightness place constraints upon the lifetime of its active area(s) and its spin state. Our prediction of the comet's return in 2126 places it well away from the Earth's position at the nodal crossing. RP YAU, K (reprint author), CALTECH,JET PROP LAB,4800 OAK GROVE DR,PASADENA,CA 91109, USA. NR 30 TC 38 Z9 40 U1 0 U2 0 PU BLACKWELL SCIENCE LTD PI OXFORD PA OSNEY MEAD, OXFORD, OXON, ENGLAND OX2 0EL SN 0035-8711 J9 MON NOT R ASTRON SOC JI Mon. Not. Roy. Astron. Soc. PD JAN 15 PY 1994 VL 266 IS 2 BP 305 EP 316 PG 12 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA MR808 UT WOS:A1994MR80800005 ER PT J AU ISHIDA, M MAKISHIMA, K MUKAI, K MASAI, K AF ISHIDA, M MAKISHIMA, K MUKAI, K MASAI, K TI DETECTION OF THE IRON K-BETA EMISSION-LINE AND 2-COMPONENT X-RAY-EMISSION FROM EX HYA SO MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY LA English DT Article DE STARS, INDIVIDUAL, EX HYA; NOVAE, CATACLYSMIC VARIABLES; X-RAYS, STARS ID TENMA OBSERVATIONS; GINGA OBSERVATION; AM HERCULIS; HYDRAE; ACCRETION; ORIGIN; POLARS AB We find that the hard X-ray spectrum from the intermediate polar EX Hya, observed with Ginga, can be interpreted by two emission components. One of these is optically thin thermal bremsstrahlung with temperature similar to 2 keV, which is separate from the well-known hard X-ray component, the spectrum of which is that of thermal bremsstrahlung with a temperature similar to 11 keV. We have also detected the iron K beta emission line from EX Hya. This is the first detection of the iron K beta emission line from a magnetized cataclysmic variable. Central energies of the K alpha and the K beta emission lines (6.8 and 8.0 keV, respectively) and their intensities indicate that they originate from optically thin thermal plasma in collisional ionization equilibrium. This is exceptional, since the central energies of the iron Ka emission lines from all the other intermediate polars observed with EXOSAT are similar to 6.4 keV, which indicate that the lines are of fluorescent origin. The properties of the iron K-emission lines of EX Hya also suggest that the observed continuum is composed of the two components noted above. The intensity of the soft component is modulated in phase with that of the hard component at the rotational period of the white dwarf, and its modulation amplitude is larger than that of the hard component. The fractional intensity deficit of the soft component during the well-known orbital eclipsing dip is, on the other hand, smaller than that of the hard component. The energy dependence of both the rotational intensity modulation and the intensity deficit during the orbital eclipsing dip are explained by the difference in modulation amplitudes of the soft and the hard components. The possible origin of the soft component is discussed. C1 UNIV TOKYO,DEPT PHYS,BUNKYO KU,TOKYO 113,JAPAN. NASA,GODDARD SPACE FLIGHT CTR,GREENBELT,MD 20771. NATL INST FUS SCI,CHIKUSA KU,NAGOYA 46401,JAPAN. RP ISHIDA, M (reprint author), INST SPACE & ASTRONAUT SCI,3-1-1 YOSHINODAI,SAGAMIHARA,KANAGAWA 229,JAPAN. NR 41 TC 9 Z9 9 U1 0 U2 0 PU BLACKWELL SCIENCE LTD PI OXFORD PA OSNEY MEAD, OXFORD, OXON, ENGLAND OX2 0EL SN 0035-8711 J9 MON NOT R ASTRON SOC JI Mon. Not. Roy. Astron. Soc. PD JAN 15 PY 1994 VL 266 IS 2 BP 367 EP 378 PG 12 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA MR808 UT WOS:A1994MR80800012 ER PT J AU LIDSEY, JE AF LIDSEY, JE TI TILTING OF THE PRIMORDIAL POWER SPECTRUM WITH BULK VISCOSITY SO MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY LA English DT Article DE GALAXIES, CLUSTERING; COSMOLOGY, THEORY; DARK MATTER; EARLY UNIVERSE; LARGE-SCALE STRUCTURE OF UNIVERSE ID REDSHIFT-DISTANCE SAMPLES; DIFFERENTIAL MICROWAVE RADIOMETER; COLD DARK MATTER; DENSITY FIELDS; INFLATIONARY UNIVERSE; DRIVEN INFLATIONARY; SCALAR FIELD; VELOCITY; ANISOTROPY; EVOLUTION AB Within the context of the cold dark matter model, current observations suggest that inflationary models that generate a tilted primordial power spectrum with negligible gravitational waves provide the most promising mechanism for explaining large-scale clustering. The general form of the inflationary potential which produces such a spectrum is a hyperbolic function and is interpreted physically as a bulk viscous stress contribution to the energy momentum of a perfect baryotropic fluid. This is equivalent to expanding the equation of state as a truncated Taylor series. Particle physics models that lead to such a potential are discussed. RP LIDSEY, JE (reprint author), NASA,FERMILAB ASTROPHYS CTR,FERMI NATL ACCELERATOR LAB,BATAVIA,IL 60510, USA. NR 51 TC 7 Z9 7 U1 0 U2 0 PU BLACKWELL SCIENCE LTD PI OXFORD PA OSNEY MEAD, OXFORD, OXON, ENGLAND OX2 0EL SN 0035-8711 J9 MON NOT R ASTRON SOC JI Mon. Not. Roy. Astron. Soc. PD JAN 15 PY 1994 VL 266 IS 2 BP 489 EP 496 PG 8 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA MR808 UT WOS:A1994MR80800023 ER PT J AU LIDSEY, JE AF LIDSEY, JE TI BIANCHI TYPE-IX QUANTUM COSMOLOGY OF THE HETEROTIC STRING SO PHYSICAL REVIEW D LA English DT Note ID SUPERSTRING THEORY; WORMHOLES; DIMENSIONS; INFLATION; UNIVERSE AB The dimensionally reduced effective action of the bosonic sector of the heterotic string in critical dimensions is employed to derive a Wheeler-DeWitt equation for the Bianchi type-IX cosmology. An exact solution is found that becomes strongly peaked around the isotropic limit as the volume of the three-geometry increases. In principle the global O(6,6) symmetry of the effective action can be employed to generate new solutions from the one presented here. RP LIDSEY, JE (reprint author), NASA,FERMILAB ASTROPHYS CTR,FERMI NATL ACCELERATOR LAB,BATAVIA,IL 60510, USA. NR 30 TC 11 Z9 11 U1 0 U2 0 PU AMERICAN PHYSICAL SOC PI COLLEGE PK PA ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA SN 0556-2821 J9 PHYS REV D JI Phys. Rev. D PD JAN 15 PY 1994 VL 49 IS 2 BP R599 EP R602 DI 10.1103/PhysRevD.49.R599 PG 4 WC Astronomy & Astrophysics; Physics, Particles & Fields SC Astronomy & Astrophysics; Physics GA MU300 UT WOS:A1994MU30000004 ER PT J AU MUELLER, CH HOLLOWAY, PH MIRANDA, FA BHASIN, KB AF MUELLER, CH HOLLOWAY, PH MIRANDA, FA BHASIN, KB TI EFFECT OF OXYGEN-PRESSURE ON THE ORIENTATION OF YBA2CU3O7-X/SRTIO3 FILMS DEPOSITED ON (1(1)OVER-BAR-02) AL2O3 SUBSTRATES SO THIN SOLID FILMS LA English DT Article ID THIN-FILMS; LASER DEPOSITION AB The oxygen pressure P(O2) during growth of strontium titanate (SrTiO3) films on single crystals of (1102BAR) oriented sapphire (Al2O3) substrates significantly influenced the film orientations. The films were deposited using a pulsed laser (248 nm) deposition process in which the SrTiO3 films were deposited at a P(O2) of either 40 or 200 mTorr, and the YBa2Cu3O7-x (YBCO) films were always deposited at 200 mTorr of oxygen. We found that growth at 40 mTorr induced the (110) SrTiO3 orientation to predominate, while increasing the P(O2) to 200 mTorr favored the (100) orientation. YBCO films deposited on these barrier layers were (013) and (001) oriented respectively; these were the orientations that minimized lattice mismatch at the YBCO/SrTiO3 interface. C1 UNIV FLORIDA,DEPT MAT SCI & ENGN,GAINESVILLE,FL 32611. RP MUELLER, CH (reprint author), NASA,LEWIS RES CTR,DIV SPACE ELECTR,21000 BROOKPARK RD,CLEVELAND,OH 44135, USA. NR 15 TC 0 Z9 0 U1 0 U2 0 PU ELSEVIER SCIENCE SA LAUSANNE PI LAUSANNE 1 PA PO BOX 564, 1001 LAUSANNE 1, SWITZERLAND SN 0040-6090 J9 THIN SOLID FILMS JI Thin Solid Films PD JAN 15 PY 1994 VL 238 IS 1 BP 123 EP 126 DI 10.1016/0040-6090(94)90661-0 PG 4 WC Materials Science, Multidisciplinary; Materials Science, Coatings & Films; Physics, Applied; Physics, Condensed Matter SC Materials Science; Physics GA MR732 UT WOS:A1994MR73200025 ER PT J AU SINGH, J VELLAIKAL, M DAT, R AF SINGH, J VELLAIKAL, M DAT, R TI GAS-FLOW EFFECTS IN SYNTHESIS OF DIAMOND BY HOT-FILAMENT CHEMICAL-VAPOR-DEPOSITION SO THIN SOLID FILMS LA English DT Article ID GROWTH AB Hot-filament chemical vapor deposition was employed to study the effect of gas flow dynamics on diamond growth. The density and growth rate of diamond within the patterned region of copper and silicon substrates was found to be twice as large as compared with that on a flat (unpatterned) surface. The density of diamond nucleation increased on patterned silicon and copper substrates with an increase in the methane concentration from 1.0% to 1.5% in the gas mixture of methane and hydrogen (CH4 + H-2). Selective growth of diamond was achieved without using diamond seed or paste, or scratching the patterned silicon substrate. About 90% diamond coverage and a continuous diamond film (75 mum) were achieved on the square-patterned silicon and copper substrates, respectively, at a methane concentration of 1.5%. The growth of diamond within the wells was discussed on the basis of gas flow dynamics. The present analysis is consistent with available theoretical models. C1 N CAROLINA STATE UNIV,DEPT MAT SCI & ENGN,RALEIGH,NC 27695. RP SINGH, J (reprint author), NASA,GEORGE C MARSHALL SPACE FLIGHT CTR,HUNTSVILLE,AL 35812, USA. NR 13 TC 8 Z9 8 U1 0 U2 1 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 1994 VL 238 IS 1 BP 133 EP 140 DI 10.1016/0040-6090(94)90663-7 PG 8 WC Materials Science, Multidisciplinary; Materials Science, Coatings & Films; Physics, Applied; Physics, Condensed Matter SC Materials Science; Physics GA MR732 UT WOS:A1994MR73200027 ER PT J AU ROSENZWEIG, C PARRY, ML AF ROSENZWEIG, C PARRY, ML TI POTENTIAL IMPACT OF CLIMATE-CHANGE ON WORLD FOOD-SUPPLY SO NATURE LA English DT Article ID CARBON-DIOXIDE; RESPONSES; MODEL AB A global assessment of the potential impact of climate change on world food supply suggests that doubling of the atmospheric carbon dioxide concentration will lead to only a small decrease in global crop production. But developing countries are likely to bear the brunt of the problem, and simulations of the effect of adaptive measures by farmers imply that these will do little to reduce the disparity between developed and developing countries. C1 GODDARD INST SPACE STUDIES,NEW YORK,NY 10025. UNIV OXFORD,ENVIRONM CHANGE UNIT,OXFORD OX1 3TB,ENGLAND. RP ROSENZWEIG, C (reprint author), COLUMBIA UNIV,2800 BROADWAY,NEW YORK,NY 10025, USA. RI zhong, honglin/C-2633-2012 NR 23 TC 666 Z9 726 U1 20 U2 200 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 13 PY 1994 VL 367 IS 6459 BP 133 EP 138 DI 10.1038/367133a0 PG 6 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA MQ780 UT WOS:A1994MQ78000049 ER PT J AU MATHER, JC CHENG, ES COTTINGHAM, DA EPLEE, RE FIXSEN, DJ HEWAGAMA, T ISAACMAN, RB JENSEN, KA MEYER, SS NOERDLINGER, PD READ, SM ROSEN, LP SHAFER, RA WRIGHT, EL BENNETT, CL BOGGESS, NW HAUSER, MG KELSALL, T MOSELEY, SH SILVERBERG, RF SMOOT, GF WEISS, R WILKINSON, DT AF MATHER, JC CHENG, ES COTTINGHAM, DA EPLEE, RE FIXSEN, DJ HEWAGAMA, T ISAACMAN, RB JENSEN, KA MEYER, SS NOERDLINGER, PD READ, SM ROSEN, LP SHAFER, RA WRIGHT, EL BENNETT, CL BOGGESS, NW HAUSER, MG KELSALL, T MOSELEY, SH SILVERBERG, RF SMOOT, GF WEISS, R WILKINSON, DT TI MEASUREMENT OF THE COSMIC MICROWAVE BACKGROUND SPECTRUM BY THE COBE FIRAS INSTRUMENT SO ASTROPHYSICAL JOURNAL LA English DT Article DE COSMIC MICROWAVE BACKGROUND; COSMOLOGY, OBSERVATIONS; EARLY UNIVERSE ID RADIATION TEMPERATURE; EXPLORER COBE; GHZ; CENTIMETERS; RADIOMETER; WAVELENGTH; POLE AB The cosmic microwave background radiation (CMBR) has a blackbody spectrum within 3.4x10(-8) ergs cm(-2)s(-1)sr(-1) cm over the frequency range from 2 to 20 cm(-1) (5-0.5 mm). These measurements, derived sr from the FIRAS instrument on the COBE satellite, imply stringent limits on energy release in the early universe after t similar to 1 year and redshift z similar to 3x10(6). The deviations are less than 0.03% of the peak brightness, with an rms value of 0.01%, and the dimensionless cosmological distortion parameters are limited to y <2.5x10(-5) and mu <3.3x10(-4) (95% confidence level). The temperature of the CMBR is 2.726+/-0.010 K (95% confidence level systematic). C1 NASA, GODDARD SPACE FLIGHT CTR, UNIV SPACE RES ASSOC, GREENBELT, MD 20771 USA. NASA, GODDARD SPACE FLIGHT CTR, GEN SCI CORP, GREENBELT, MD 20771 USA. NASA, GODDARD SPACE FLIGHT CTR, APPL RES CORP, GREENBELT, MD 20771 USA. NASA, GODDARD SPACE FLIGHT CTR, HUGHES STX, GREENBELT, MD 20771 USA. MIT, DEPT PHYS, CAMBRIDGE, MA 02139 USA. UNIV CALIF LOS ANGELES, DEPT ASTRON, LOS ANGELES, CA 90024 USA. UNIV CALIF BERKELEY, LBL, SSL, BERKELEY, CA 94720 USA. PRINCETON UNIV, DEPT PHYS, PRINCETON, NJ 08540 USA. RP MATHER, JC (reprint author), NASA, GODDARD SPACE FLIGHT CTR, CODE 685, GREENBELT, MD 20771 USA. RI Hewagama, T/C-8488-2012; Moseley, Harvey/D-5069-2012 NR 35 TC 481 Z9 484 U1 3 U2 16 PU IOP PUBLISHING LTD PI BRISTOL PA TEMPLE CIRCUS, TEMPLE WAY, BRISTOL BS1 6BE, ENGLAND SN 0004-637X J9 ASTROPHYS J JI Astrophys. J. PD JAN 10 PY 1994 VL 420 IS 2 BP 439 EP 444 DI 10.1086/173574 PN 1 PG 6 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA MQ448 UT WOS:A1994MQ44800001 ER PT J AU FIXSEN, DJ CHENG, ES COTTINGHAM, DA EPLEE, RE ISAACMAN, RB MATHER, JC MEYER, SS NOERDLINGER, PD SHAFER, RA WEISS, R WRIGHT, EL BENNETT, CL BOGGESS, NW KELSALL, T MOSELEY, SH SILVERBERG, RF SMOOT, GF WILKINSON, DT AF FIXSEN, DJ CHENG, ES COTTINGHAM, DA EPLEE, RE ISAACMAN, RB MATHER, JC MEYER, SS NOERDLINGER, PD SHAFER, RA WEISS, R WRIGHT, EL BENNETT, CL BOGGESS, NW KELSALL, T MOSELEY, SH SILVERBERG, RF SMOOT, GF WILKINSON, DT TI COSMIC MICROWAVE BACKGROUND DIPOLE SPECTRUM MEASURED BY THE COBE FIRAS INSTRUMENT SO ASTROPHYSICAL JOURNAL LA English DT Article DE COSMIC MICROWAVE BACKGROUND; COSMOLOGY, OBSERVATIONS; EARLY UNIVERSE ID LARGE-SCALE ANISOTROPY; EXPLORER COBE; RADIATION; RADIOMETER AB The FIRAS instrument on the COBE has determined the dipole spectrum of the cosmic microwave background radiation (CMBR) from 2 to 20 cm(-1). For each frequency the signal is decomposed by fitting to a monopole, a dipole, and a Galactic template for similar to 60% of the sky. The overall dipole spectrum fits the derivative of a Planck function with an amplitude of 3.343+/-0.016 mK (95% confidence level), a temperature of 2.714+/-0.022 K (95% confidence level), and an rms deviation of 6x10(-9) ergs cm(-2) s(-1) sr(-1) cm limited by detector and cosmic-ray noise. The monopole temperature is consistent with that determined by direct measurement in the accompanying article by Mather et al. C1 NASA, GODDARD SPACE FLIGHT CTR, GREENBELT, MD 20771 USA. NASA, GODDARD SPACE FLIGHT CTR, UNIV SPACE RES ASSOC, GREENBELT, MD 20771 USA. NASA, GODDARD SPACE FLIGHT CTR, GEN SCI CORP, GREENBELT, MD 20771 USA. MIT, DEPT PHYS, CAMBRIDGE, MA 02139 USA. UNIV CALIF LOS ANGELES, DEPT ASTRON, LOS ANGELES, CA 90024 USA. UNIV CALIF BERKELEY, LBL, SSL, BERKELEY, CA 94720 USA. PRINCETON UNIV, DEPT PHYS, PRINCETON, NJ 08540 USA. RP FIXSEN, DJ (reprint author), NASA, GODDARD SPACE FLIGHT CTR, APPL RES CORP, CODE 685 3, GREENBELT, MD 20771 USA. RI Moseley, Harvey/D-5069-2012 NR 16 TC 62 Z9 62 U1 0 U2 3 PU IOP PUBLISHING LTD PI BRISTOL PA TEMPLE CIRCUS, TEMPLE WAY, BRISTOL BS1 6BE, ENGLAND SN 0004-637X J9 ASTROPHYS J JI Astrophys. J. PD JAN 10 PY 1994 VL 420 IS 2 BP 445 EP 449 DI 10.1086/173575 PN 1 PG 5 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA MQ448 UT WOS:A1994MQ44800002 ER PT J AU WRIGHT, EL MATHER, JC FIXSEN, DJ KOGUT, A SHAFER, RA BENNETT, CL BOGGESS, NW CHENG, ES SILVERBERG, RF SMOOT, GF WEISS, R AF WRIGHT, EL MATHER, JC FIXSEN, DJ KOGUT, A SHAFER, RA BENNETT, CL BOGGESS, NW CHENG, ES SILVERBERG, RF SMOOT, GF WEISS, R TI INTERPRETATION OF THE COBE FIRAS CMBR SPECTRUM SO ASTROPHYSICAL JOURNAL LA English DT Article DE COSMIC MICROWAVE BACKGROUND; COSMOLOGY, OBSERVATIONS; EARLY UNIVERSE ID COSMIC-BACKGROUND-RADIATION; DIFFERENTIAL MICROWAVE RADIOMETER; HOT INTERGALACTIC MEDIUM; INTER-GALACTIC MEDIUM; PRECISE MEASUREMENT; 7.5 GHZ; TEMPERATURE; UNIVERSE; NUCLEOSYNTHESIS; DISTORTIONS AB The cosmic microwave background spectrum measured by the FIRAS instrument on NASA's COBE is indistinguishable from a blackbody, implying stringent limits on energy release in the early universe later than the time t=1 yr after the big bang. We compare the FIRAS data to previous precise measurements of the cosmic microwave background spectrum and find a reasonable agreement. We discuss the implications of the y<2.5x10(-5) and mu<3.3x10(-4) 95% confidence limits found by Mather et al. (1994) on many processes occurring after t=1 yr, such as explosive structure formation, reionization, and dissipation of small-scale density perturbations. We place limits on models with dust plus Population III stars, or evolving populations of IR galaxies, by directly comparing the Mather et al, spectrum to the model predictions. C1 NASA, GODDARD SPACE FLIGHT CTR, GREENBELT, MD 20771 USA. NASA, GODDARD SPACE FLIGHT CTR, APPL RES CORP, GREENBELT, MD 20771 USA. NASA, GODDARD SPACE FLIGHT CTR, UNIV SPACE RES ASSOC, GREENBELT, MD 20771 USA. UNIV CALIF BERKELEY, LBL, SSL, BERKELEY, CA 94720 USA. MIT, DEPT PHYS, CAMBRIDGE, MA 02139 USA. RP WRIGHT, EL (reprint author), UNIV CALIF LOS ANGELES, DEPT ASTRON, LOS ANGELES, CA 90024 USA. RI Kogut, Alan/D-6293-2012 NR 56 TC 100 Z9 101 U1 0 U2 2 PU IOP PUBLISHING LTD PI BRISTOL PA TEMPLE CIRCUS, TEMPLE WAY, BRISTOL BS1 6BE, ENGLAND SN 0004-637X J9 ASTROPHYS J JI Astrophys. J. PD JAN 10 PY 1994 VL 420 IS 2 BP 450 EP 456 DI 10.1086/173576 PN 1 PG 7 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA MQ448 UT WOS:A1994MQ44800003 ER PT J AU FIXSEN, DJ CHENG, ES COTTINGHAM, DA EPLEE, RE HEWAGAMA, T ISAACMAN, RB JENSEN, KA MATHER, JC MASSA, DL MEYER, SS NOERDLINGER, PD READ, SM ROSEN, LP SHAFER, RA TRENHOLME, AR WEISS, R BENNETT, CL BOGGESS, NW WILKINSON, DT WRIGHT, EL AF FIXSEN, DJ CHENG, ES COTTINGHAM, DA EPLEE, RE HEWAGAMA, T ISAACMAN, RB JENSEN, KA MATHER, JC MASSA, DL MEYER, SS NOERDLINGER, PD READ, SM ROSEN, LP SHAFER, RA TRENHOLME, AR WEISS, R BENNETT, CL BOGGESS, NW WILKINSON, DT WRIGHT, EL TI CALIBRATION OF THE COBE FIRAS INSTRUMENT SO ASTROPHYSICAL JOURNAL LA English DT Article DE COSMIC MICROWAVE BACKGROUND; INSTRUMENTATION, SPECTROGRAPHS ID BACKGROUND-EXPLORER COBE; BOLOMETERS AB The FIRAS instrument on the COBE satellite was designed to accurately measure the spectrum of the cosmic microwave background radiation (CMBR) in the frequency range 1-95 cm(-1) with an angular resolution of 7 degrees. We describe the calibration of this instrument, including the method of obtaining calibration data, reduction of data, the instrument model, fitting the model to the calibration data, and application of the resulting model solution to sky observations. The instrument model fits well for calibration data that resemble sky conditions. The method of propagating detector noise through the calibration process to yield a covariance matrix of the calibrated sky data is described. The final uncertainties are variable both in frequency and position, but for a typical calibrated sky 2 degrees 6 square pixel and 0.7 cm(-1) spectral element the random detector noise limit is of order of a few times 10(-7) ergs cm(-2) s(-1) sr(-1) cm for 2-20 cm(-1), and the difference between the sky and the best-fit cosmic blackbody can be measured with a gain uncertainty of less than 3%. C1 NASA, GODDARD SPACE FLIGHT CTR, GREENBELT, MD 20771 USA. NASA, GODDARD SPACE FLIGHT CTR, UNIV SPACE RES ASSOC, GREENBELT, MD 20771 USA. NASA, GODDARD SPACE FLIGHT CTR, GEN SCI CORP, GREENBELT, MD 20771 USA. NASA, GODDARD SPACE FLIGHT CTR, HUGHES STX, GREENBELT, MD 20771 USA. MIT, DEPT PHYS, CAMBRIDGE, MA 02139 USA. PRINCETON UNIV, JOSEPH HENRY LABS PHYS, PRINCETON, NJ 08540 USA. UNIV CALIF LOS ANGELES, DEPT ASTRON, LOS ANGELES, CA 90024 USA. RP FIXSEN, DJ (reprint author), NASA, GODDARD SPACE FLIGHT CTR, APPL RES CORP, CODE 685 3, GREENBELT, MD 20771 USA. RI Hewagama, T/C-8488-2012 NR 16 TC 53 Z9 53 U1 0 U2 1 PU IOP PUBLISHING LTD PI BRISTOL PA TEMPLE CIRCUS, TEMPLE WAY, BRISTOL BS1 6BE, ENGLAND SN 0004-637X J9 ASTROPHYS J JI Astrophys. J. PD JAN 10 PY 1994 VL 420 IS 2 BP 457 EP 473 DI 10.1086/173577 PN 1 PG 17 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA MQ448 UT WOS:A1994MQ44800004 ER PT J AU SUBBARAO, MU SZALAY, AS SCHAEFER, RK GULKIS, S VONGRONEFELD, P AF SUBBARAO, MU SZALAY, AS SCHAEFER, RK GULKIS, S VONGRONEFELD, P TI MICROWAVE BACKGROUND FLUCTUATIONS DUE TO THE SUNYAEV-ZELDOVICH EFFECT IN PANCAKES SO ASTROPHYSICAL JOURNAL LA English DT Article DE COSMIC MICROWAVE BACKGROUND; COSMOLOGY, THEORY ID VORONOI FOAMS; ANISOTROPY; UNIVERSE; STATISTICS; RADIATION; GALAXIES AB We calculate distortions in the microwave background radiation from the Sunyaev-Zel'dovich effect, produced by hot gas in large (similar to 100 Mpc) pancakes. The large-scale distribution of the pancakes is taken to be that of a Voronoi foam. Fluctuations for this scenario are estimated to be on the order of Delta T/T similar to 10(-5). Using computer simulations, we produce several 32 degrees x32 degrees images with 0 degrees 25 resolution. These images show characteristic linear features produced when a pancake is viewed nearly edge-on. By calculating the two-point and the degenerate three-point correlation functions, we are able to statistically detect such non-Gaussian features even in the presence of a relatively large amount of Gaussian noise. The degenerate three-point correlation function is found to be particularly useful since it is insensitive to correlated Gaussian noise. We also smooth our data over a 7 degrees FWHM Gaussian window to simulate the COBE observations. We find that under such low-resolution conditions, the features are highly suppressed. C1 EOTVOS LORAND UNIV, DEPT PHYS, BUDAPEST, HUNGARY. UNIV DELAWARE, BARTOL RES INST, NEWARK, DE 19716 USA. CALTECH, JET PROP LAB, PASADENA, CA 91109 USA. RP SUBBARAO, MU (reprint author), JOHNS HOPKINS UNIV, DEPT PHYS & ASTRON, BALTIMORE, MD 21218 USA. RI Schaefer, Robert/C-2119-2016 OI Schaefer, Robert/0000-0003-3692-0223 NR 29 TC 7 Z9 7 U1 0 U2 0 PU IOP PUBLISHING LTD PI BRISTOL PA DIRAC HOUSE, TEMPLE BACK, BRISTOL BS1 6BE, ENGLAND SN 0004-637X J9 ASTROPHYS J JI Astrophys. J. PD JAN 10 PY 1994 VL 420 IS 2 BP 474 EP 483 DI 10.1086/173578 PN 1 PG 10 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA MQ448 UT WOS:A1994MQ44800005 ER PT J AU BONNELL, JT VESTRAND, WT STACY, JG AF BONNELL, JT VESTRAND, WT STACY, JG TI ULTRAVIOLET OBSERVATIONS OF THE GAMMA-RAY BLAZAR 3C 279 FOLLOWING THE GAMMA-RAY FLARE OF 1991 JUNE SO ASTROPHYSICAL JOURNAL LA English DT Article DE GAMMA RAYS, OBSERVATIONS; QUASARS, INDIVIDUAL (3C 279); ULTRAVIOLET, GALAXIES ID COMPACT RADIO-SOURCES; RELATIVISTIC JETS; QUASAR 3C-279; X-RAY; IUE; TELESCOPE; RADIATION; OUTBURST; SPECTRA; CAMERA AB Ultraviolet observations of the gamma-ray blazar 3C 279 were carried out in 1991 July with the International Ultraviolet Explorer (IUE) satellite, 28 days after the outburst of intense gamma-ray emission detected from this source with the high-energy EGRET instrument aboard the Compton Gamma-Ray Observatory. IUE observations were conducted over the wavelength range 1200-3200 Angstrom (5-10 eV) and are compared with archival UV measurements spanning the period 1988-1991. This set of observations was analyzed with a uniform, standardized data-reduction procedure. No significant variability in the UV spectrum of 3C 279 is noted over timescales of hours, though variations at the 3 sigma level or higher exist on longer timescales of months to years. The UV observations which most closely bracket the gamma-ray flare detected by EGRET show similar to 3 sigma differences in flux and spectral index, consistent with (but not definitive proof of) variations in the UV flux during the period of the gamma-ray flare. Statistically marginal evidence for a monotonic correlation is found between UV spectral index and the emission observed from 3C 279, in that a harder spectrum is associated with increased UV flux. C1 UNIV NEW HAMPSHIRE,CTR SPACE SCI,DURHAM,NH 03824. UNIV NEW HAMPSHIRE,CTR SPACE SCI,COMP SCI CORP,ASTRON PROGRAMS,DURHAM,NH 03824. RP BONNELL, JT (reprint author), NASA,GSFC,COMP SCI CORP,ASTRON PROGRAMS,CODE 6681,GREENBELT,MD 20771, USA. NR 43 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 JAN 10 PY 1994 VL 420 IS 2 BP 545 EP 550 DI 10.1086/173584 PN 1 PG 6 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA MQ448 UT WOS:A1994MQ44800011 ER PT J AU RUBIN, RH SIMPSON, JP LORD, SD COLGAN, SWJ ERICKSON, EF HAAS, MR AF RUBIN, RH SIMPSON, JP LORD, SD COLGAN, SWJ ERICKSON, EF HAAS, MR TI NEBULAR PROPERTIES FROM FAR-INFRARED SPECTROSCOPY SO ASTROPHYSICAL JOURNAL LA English DT Article DE INFRARED, ISM, LINES AND BANDS; H II REGIONS; ISM, ABUNDANCES; ISM, INDIVIDUAL (G333.6-0.2) ID H-II REGIONS; LINE OBSERVATIONS; ORION NEBULA; CHEMICAL-COMPOSITION; N-III; ABUNDANCE; EMISSION; G333.6-0.2; MODELS; ULTRAVIOLET AB We describe a semiempirical methodology-based on measurements of far-infrared (FIR) lines-that yields information on electron densities in regions where various ionic species exist, effective temperatures (T-eff) for stars ionizing H II regions, and gas-phase heavy element abundances. Although this capability has long been available via optical data, the special features of FIR lines-relative insensitivity to extinction and electron temperature variations-extend the analysis ability. Several line ratios serve as diagnostics of electron density, N-e, probing different ionization conditions and different density regimes. The more N-e-diagnostic observations made, the more reliable will be the deciphering of the actual variation in density throughout a nebula. A method to estimate T-eff from the FIR [N III]/[N II] line ratio requires that the nebula be ionization bounded and that substantially all of the flux from the relevant lines be observed. However, to estimate T-eff by a second method that uses the ratio of FIR [S III]/[O III] lines, an ionization-bounded nebula is a sufficient, but not necessary, condition. These restrictions are unnecessary for estimating densities and heavy element abundances. We show that a fairly general determination of metallicity, via the S/H ratio, may be made for H II regions with observations of just two lines-[S III] 19 mu m and a hydrogen recombination line (or appropriate substitute). These techniques are applied to recent FIR data for the G333.6-0.2 H It region, including application to the recently measured [N II] 122 and 205 mu m lines. RP RUBIN, RH (reprint author), NASA,AMES RES CTR,DIV SPACE SCI,MS 245-6,MOFFETT FIELD,CA 94035, USA. RI Colgan, Sean/M-4742-2014 NR 44 TC 85 Z9 85 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 1994 VL 420 IS 2 BP 772 EP 782 DI 10.1086/173601 PN 1 PG 11 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA MQ448 UT WOS:A1994MQ44800028 ER PT J AU BOYLE, RJ KEADY, JJ JENNINGS, DE HIRSCH, KL WIEDEMANN, GR AF BOYLE, RJ KEADY, JJ JENNINGS, DE HIRSCH, KL WIEDEMANN, GR TI OBSERVATIONS OF 13.5 MICRON ROTATION-VIBRATION LINES OF SIS IN IRC PLUS 10216 SO ASTROPHYSICAL JOURNAL LA English DT Article DE CIRCUMSTELLAR MATTER; MOLECULAR PROCESSES; STARS, ABUNDANCES; STARS, CARBON; STARS, INDIVIDUAL (IRC + 10216) ID IRC+10216 MOLECULAR ENVELOPE; CIRCUMSTELLAR ENVELOPE; INFRARED-SPECTRUM; STARS; ABUNDANCES; EMISSION; SHELLS AB We report the first observations of the 13.5 mu m fundamental band of SiS in the spectrum of the heavily obscured carbon star IRC +10216. The lines are formed in the inner region of the circumstellar envelope where the gas is accelerating and where the temperature ranges from 800-500 K. We have carried out a detailed model of the observed line profiles. Our observations are best fit by a gradient in the abundance of SiS. We derive an abundance relative to molecular hydrogen of x(SiS) = 4.3 x 10(-6) ata distance of twelve stellar radii from the central star rising to x(SiS)= 4.3 x 10(-5) at a few Stellar radii from the surface of the star. C1 DICKINSON COLL,DEPT PHYS & ASTRON,CARLISLE,PA 17013. LOS ALAMOS NATL LAB,GRP T4,LOS ALAMOS,NM 87545. NASA,GODDARD SPACE FLIGHT CTR,PLANETARY SYST BRANCH,GREENBELT,MD 20771. UNIV TENNESSEE,DEPT PHYS,KNOXVILLE,TN 37996. EUROPEAN SO OBSERV,W-8046 GARCHING,GERMANY. RI Jennings, Donald/D-7978-2012 NR 43 TC 29 Z9 29 U1 0 U2 3 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 1994 VL 420 IS 2 BP 863 EP 868 DI 10.1086/173609 PN 1 PG 6 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA MQ448 UT WOS:A1994MQ44800036 ER PT J AU RICHARDSON, IG AF RICHARDSON, IG TI A SURVEY OF BIDIRECTIONAL GREATER-THAN-OR-EQUAL-TO-1 MEV ION FLOWS DURING THE HELIOS-I AND HELIOS-2 MISSIONS - OBSERVATIONS FROM THE GODDARD-SPACE-FLIGHT-CENTER INSTRUMENTS SO ASTROPHYSICAL JOURNAL LA English DT Article DE ARTIFICIAL SATELLITES, SPACE PROBES; SOLAR WIND; SUN, PARTICLE EMISSION ID SOLAR ENERGETIC PARTICLES; MAGNETIC-FIELD STRUCTURE; INTERPLANETARY SHOCKS; MASS EJECTIONS; LOOP STRUCTURE; WIND; EVENTS; CLOUDS; 1-AU; ENHANCEMENTS AB A survey is made of 1.1-2.1 MeV and 3-21 MeV bidirectional ion flows (BIFs) in the solar wind at 0.3-1.0 AU observed by the Goddard Space Flight Center instruments on the Helios 1 and Helios 2 spacecraft during the spacecraft missions in 1974-1984 and 1976-1980, respectively. Some 774 events have been identified at Helios 1, and 223 at Helios 2, with mean durations of similar to 2.5 hr at each spacecraft. BIFs were observed for similar to 1%-3% of the observation time during solar minimum conditions in 1975-1977 and for similar to 10%-14% in 1980-1981 around solar maximum. These occurrence rates are similar to those of similar to 1 MeV BIFs observed at the IMP 8 and ISEE 3 spacecraft, and of bidirectional electron heat fluxes at ISEE 3. Solar wind plasma parameters during BIFs were similar to those found generally during the Hellos missions, though BIFs have a greater tendency to be associated with cool, low-beta plasma, moderately enhanced and low-variance magnetic fields, and both less than 300 km s(-1) and greater than 750 km s(-1) solar wind. Solar wind features associated with the greater than 4 hr duration BIFs include clear plasma shock-driver signatures: similar to 36% of the events; postshock plasma, not associated with shock-driver signatures: similar to 13%; noncompressive density enhancements: similar to 22% (half associated with plasma proton temperature depressions); high-speed streams not associated with shocks: similar to 10%; corotating interaction regions: similar to 5%; immediately upstream of shocks: similar to 5%. Around 8% were associated with other solar wind structures, while similar to 4% showed no associated structure. BIFs were present in several of the shock drivers associated with coronal mass ejections (CMEs) observed by the Solwind coronagraph during intervals when Helios 1 was off the limbs of the Sun, showing directly the association of some BIFs with CMEs. C1 UNIV MARYLAND,DEPT ASTRON,COLL PK,MD 20742. RP RICHARDSON, IG (reprint author), NASA,GODDARD SPACE FLIGHT CTR,HIGH ENERGY ASTROPHYS LAB,GREENBELT,MD 20771, USA. OI Richardson, Ian/0000-0002-3855-3634 NR 48 TC 11 Z9 11 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 1994 VL 420 IS 2 BP 926 EP 942 DI 10.1086/173616 PN 1 PG 17 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA MQ448 UT WOS:A1994MQ44800043 ER PT J AU DUCK, PW ERLEBACHER, G HUSSAINI, MY AF DUCK, PW ERLEBACHER, G HUSSAINI, MY TI ON THE LINEAR-STABILITY OF COMPRESSIBLE PLANE COUETTE-FLOW SO JOURNAL OF FLUID MECHANICS LA English DT Article ID SUPERSONIC MIXING LAYERS; BOUNDARY-LAYER; MACH-NUMBER; INSTABILITY; MODES AB The linear stability of compressible plane Couette flow is investigated. The appropriate basic velocity and temperature distributions are perturbed by a small-amplitude normal-mode disturbance. The full small-amplitude disturbance equations are solved numerically at finite Reynolds numbers, and the inviscid limit of these equations is then investigated in some detail. It is found that instabilities can occur, although the corresponding growth rates are often quite small; the stability characteristics of the flow are quite different from unbounded flows. The effects of viscosity are also calculated, asymptotically, and shown to have a stabilizing role in all the cases investigated. Exceptional regimes to the problem occur when the wave speed of the disturbances approaches the velocity of either of the walls, and these regimes are also analysed in some detail. Finally, the effect of imposing radiation-type boundary conditions on the upper (moving) wall (in place of impermeability) is investigated, and shown to yield results common to both bounded and unbounded flows. C1 NASA,LANGLEY RES CTR,INST COMP APPLICAT SCI & ENGN,HAMPTON,VA 23665. RP DUCK, PW (reprint author), UNIV MANCHESTER,DEPT MATH,MANCHESTER M13 9PL,ENGLAND. NR 61 TC 17 Z9 21 U1 0 U2 2 PU CAMBRIDGE UNIV PRESS PI NEW YORK PA 40 WEST 20TH STREET, NEW YORK, NY 10011-4211 SN 0022-1120 J9 J FLUID MECH JI J. Fluid Mech. PD JAN 10 PY 1994 VL 258 BP 131 EP 165 DI 10.1017/S0022112094003277 PG 35 WC Mechanics; Physics, Fluids & Plasmas SC Mechanics; Physics GA MT806 UT WOS:A1994MT80600006 ER PT J AU REALMUTO, VJ ABRAMS, MJ BUONGIORNO, MF PIERI, DC AF REALMUTO, VJ ABRAMS, MJ BUONGIORNO, MF PIERI, DC TI THE USE OF MULTISPECTRAL THERMAL INFRARED IMAGE DATA TO ESTIMATE THE SULFUR-DIOXIDE FLUX FROM VOLCANOS - A CASE-STUDY FROM MOUNT ETNA, SICILY, JULY 29, 1986 SO JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH LA English DT Article ID AUGUSTINE VOLCANO; SO2 EMISSION; ERUPTIONS; CLOUDS; ATMOSPHERE; PLUMES AB We have found that image data acquired with NASA's airborne Thermal Infrared Multispectral Scanner (TIMS) can be used to make estimates of the SO2 content of volcanic plumes. TIMS image data are most applicable to the study of partially transparent SO2 plumes, such as those released during quiescent periods or nonexplosive eruptions. The estimation procedure is based on the LOWTRAN 7 radiative transfer code, which we use to model the radiance perceived by TIMS as it views the ground through an SO2 plume. The input to the procedure includes the altitudes of the aircraft and ground, the altitude and thickness of the SO2 plume, the emissivity of the ground, and altitude profiles of the atmospheric pressure, temperature, and relative humidity. We use the TIMS data to estimate both ground temperatures beneath a plume and SO2 concentrations within a plume. Applying our procedure to TIMS data acquired over Mount Etna, Sicily, on July 29, 1986, we estimate that the SO2 flux from the volcano was approximately 6700 t d-1. The use of TIMS to study SO2 plumes represents a bridge between highly localized methods, such as correlation spectroscopy or direct sampling, and small-scale mapping techniques involving satellite instruments such as the Total Ozone Mapping Spectrometer or Microwave Limb Sounder. We require further airborne experiments to refine our estimation procedure. This refinement is a necessary preparation for the scheduled 1998 launch of the Advanced Spaceborne Thermal Emission and Reflectance Radiometer, which will allow large-scale multispectral thermal infrared image data to be collected over virtually any volcano on Earth at least once every 16 days. RP REALMUTO, VJ (reprint author), JET PROP LAB, MS 183-501, 4800 OAK GROVE DR, PASADENA, CA 91109 USA. NR 45 TC 83 Z9 83 U1 0 U2 3 PU AMER GEOPHYSICAL UNION PI WASHINGTON PA 2000 FLORIDA AVE NW, WASHINGTON, DC 20009 USA SN 2169-9313 EI 2169-9356 J9 J GEOPHYS RES-SOL EA JI J. Geophys. Res.-Solid Earth PD JAN 10 PY 1994 VL 99 IS B1 BP 481 EP 488 DI 10.1029/93JB02062 PG 8 WC Geochemistry & Geophysics SC Geochemistry & Geophysics GA MR515 UT WOS:A1994MR51500002 ER PT J AU MACMILLAN, DS MA, C AF MACMILLAN, DS MA, C TI EVALUATION OF VERY LONG-BASE-LINE INTERFEROMETRY ATMOSPHERIC MODELING IMPROVEMENTS SO JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH LA English DT Article ID GLOBAL POSITIONING SYSTEM; LINE INTERFEROMETRY; PRECISION; GEODESY AB We determined the improvement in baseline length precision and accuracy using new atmospheric delay mapping functions (Ifadis (Ifadis, 1986) and MTT (Herring, 1992a)) by analyzing the NASA Crustal Dynamics Project research and development (R&D) experiments and the International Radio Inter-ferometric Surveying (IRIS) A experiments. These mapping functions reduce baseline length scatter by about 20 % below that using the CfA2.2 (Davis et al., 1985) dry and Chao (Chao, 1974) wet mapping functions. With the newer mapping functions, average station vertical scatter inferred from observed length precision (given by length repeatabilities) is 11.4 mm for the 1987-1990 monthly R&D series of experiments and 5.6 mm for the 3-week-long ERDE series. The inferred monthly R&D station vertical scatter is reduced by 2 mm or by 7 mm in a root-sum-square (rss) sense. Length repeatabilities are optimum when observations below a 7-8-degrees elevation cutoff are removed from the geodetic solution. Analyses of IRIS-A data from 1984 through 1991 and the monthly R&D experiments both yielded a nonatmospheric unmodeled station vertical error of about 8 mm. In addition, analysis of the IRIS-A experiments revealed systematic effects in the evolution of some baseline length measurements. The length rate of change has an apparent acceleration, and the length evolution has a quasi-annual signature. We show that the origin of these effects is unlikely to be related to atmospheric modeling errors. Rates of change of the transatlantic Westford-Wettzell and Richmond-Wettzell baseline lengths calculated from 1988 through 1991 agree with the NUVEL-1 plate motion model (Argus and Gordon, 1991) to within 1 mm/yr. Short-term (less than 90 days) variations of IRIS-A baseline length measurements contribute more than 90% of the observed scatter about a best fit line, and this short-term scatter has large variations on an annual time scale. C1 NASA, GODDARD SPACE FLIGHT CTR, GEODYNAM BRANCH, GREENBELT, MD 20771 USA. INTERFEROMET INC, GREENBELT, MD USA. RP MACMILLAN, DS (reprint author), NASA, GODDARD SPACE FLIGHT CTR, NVI INC, SPACE GEODESY BRANCH, CODE 9269, GREENBELT, MD 20771 USA. RI Ma, Chopo/D-4751-2012 NR 34 TC 34 Z9 38 U1 1 U2 2 PU AMER GEOPHYSICAL UNION PI WASHINGTON PA 2000 FLORIDA AVE NW, WASHINGTON, DC 20009 USA SN 2169-9313 EI 2169-9356 J9 J GEOPHYS RES-SOL EA JI J. Geophys. Res.-Solid Earth PD JAN 10 PY 1994 VL 99 IS B1 BP 637 EP 651 DI 10.1029/93JB02162 PG 15 WC Geochemistry & Geophysics SC Geochemistry & Geophysics GA MR515 UT WOS:A1994MR51500015 ER PT J AU LEE, TJ AF LEE, TJ TI AB-INITIO CHARACTERIZATION OF CLNO2, CIS-CLONO, AND TRANS-CLONO SO JOURNAL OF PHYSICAL CHEMISTRY LA English DT Article ID GAUSSIAN-BASIS SETS; MOLECULAR CALCULATIONS; 2ND-ROW ATOMS; ROW ATOMS; CONTRACTION; CL2O2; FONO AB The CCSD(T) method, singles and doubles coupled-cluster theory plus a perturbational estimate of the effects of connected triple excitations, has been used in conjunction with a double polarized triple-zeta (TZ2P) basis set to determine the equilibrium structures, dipole moment, vibrational frequencies, and infrared intensities of ClNO2, cis-ClONO, and trans-ClONO. The ab initio results are compared with the available experimental data, and the CCSD(T) results are found to be in excellent agreement with the experimental values, indicating that the CCSD(T) method performs well in describing the weak Cl-N and Cl-O single bonds. The equilibrium structures of cis- and trans-ClONO are shown to possess normal Cl-O, O-N, and N=O bond distances, in disagreement with a previous study in which the structures were determined based on a normal coordinate analysis using the experimental frequencies. It is shown that incorrect structures were obtained due to a mislabeling of the vibrational modes. A vibrational band previously assigned to an OClNO species is shown to be actually due to trans-ClONO. The relative energies of the various species are investigated by computing CCSD(T) energies using atomic natural orbital (ANO) basis sets of spdfg quality. ClNO2 is found to be more stable than cis-ClONO by 10.7 +/- 1.0 kcal/mol while trans-ClONO is 3.1 +/- 0.8 kcal/mol higher in energy than cis-ClONO. The heats of formation of cis-ClONO and trans-ClONO are predicted (15.4 +/- 1.5 and 18.0 +/- 1.5 kcal/mol, respectively; 0 K) using isodesmic reactions involving H2O, HOCl, and cis- and trans-HONO. RP LEE, TJ (reprint author), NASA, AMES RES CTR, MOFFETT FIELD, CA 94035 USA. RI Lee, Timothy/K-2838-2012 NR 30 TC 41 Z9 42 U1 1 U2 5 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 USA SN 0022-3654 J9 J PHYS CHEM-US JI J. Phys. Chem. PD JAN 6 PY 1994 VL 98 IS 1 BP 111 EP 115 DI 10.1021/j100052a019 PG 5 WC Chemistry, Physical SC Chemistry GA MR068 UT WOS:A1994MR06800019 ER PT J AU GLEASON, JF NESBITT, FL STIEF, LJ AF GLEASON, JF NESBITT, FL STIEF, LJ TI TEMPERATURE-DEPENDENCE OF THE REACTION BETWEEN O(P(3)) AND OCLO AT LOW-PRESSURE SO JOURNAL OF PHYSICAL CHEMISTRY LA English DT Article ID NEAR-ULTRAVIOLET SPECTROSCOPY; MCMURDO-STATION; COLUMN ABUNDANCES; CHLORINE DIOXIDE; ANTARCTICA; OCIO; PHOTOLYSIS; MECHANISM; NO2 AB The rate coefficient for the reaction O(3p) + OClO has been measured at low pressure (1-5 Torr) over the temperature range 200400 K. The experiments were performed in a discharge flow system with atomic resonance fluorescence detection of O(3P). The ratio of [OClO]/[O] was kept very high (usually 10(3)-10(4)) in order to avoid secondary reactions. At 298 K, k = (1.0 +/- 0.3) X 10(-13) molecules-1 cm3 s-1, which is consistent with recent results obtained at high pressure (8-800 Torr argon) and extrapolated to zero pressure. In the present low-pressure experiments, the rate coefficient increases with increasing temperature from 243 to 400 K while from 200 to 225 K the rate coefficient decreases with increasing temperature. The Arrhenius expression for the 243-400 K region is k = (2.4 +/- 0.8) X 10(-12) exp[(-960 +/- 120)/T] molecule-1 cm3 s-1. The trend observed here for T = 243-400 K is opposite to that inferred from the extrapolation of high-pressure results (20-600 Torr argon) at T = 248-312 K. Our high-temperature results (243-400 K) are consistent with the bimolecular abstraction channel, O(3P) + OClO --> ClO + O2. C1 NASA,GODDARD SPACE FLIGHT CTR,EXTRATERR PHYS LAB,GREENBELT,MD 20771. COPPIN STATE COLL,DEPT NAT SCI,BALTIMORE,MD 21216. RP GLEASON, JF (reprint author), NASA,GODDARD SPACE FLIGHT CTR,ATMOSPHERES LAB,MAIL CODE 916,GREENBELT,MD 20771, USA. RI Gleason, James/E-1421-2012 NR 24 TC 12 Z9 12 U1 0 U2 1 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0022-3654 J9 J PHYS CHEM-US JI J. Phys. Chem. PD JAN 6 PY 1994 VL 98 IS 1 BP 126 EP 131 DI 10.1021/j100052a022 PG 6 WC Chemistry, Physical SC Chemistry GA MR068 UT WOS:A1994MR06800022 ER PT J AU NICKOLAISEN, SL FRIEDL, RR SANDER, SP AF NICKOLAISEN, SL FRIEDL, RR SANDER, SP TI KINETICS AND MECHANISM OF THE CLO+CLO REACTION - PRESSURE AND TEMPERATURE DEPENDENCES OF THE BIMOLECULAR AND TERMOLECULAR CHANNELS AND THERMAL-DECOMPOSITION OF CHLORINE PEROXIDE SO JOURNAL OF PHYSICAL CHEMISTRY LA English DT Article ID ABSORPTION CROSS-SECTIONS; UNIMOLECULAR REACTIONS; ANTARCTIC OZONE; RATE CONSTANTS; SELF-REACTION; CLO; PHOTOLYSIS; CL2O2; NM; SPECTRA AB The kinetics and mechanism of the CIO + CIO reaction and the thermal decomposition of ClOOCl were studied using the flash photolysis/long path ultraviolet absorption technique. Pressure and temperature dependences were determined for the rate coefficients for the bimolecular and termolecular reaction channels and for the thermal decomposition of ClOOCl. In order to determine channel-specific rate coefficients and to minimize complications associated with secondary chemistry, the reaction was studied over wide ranges of initial reactant stoichiometry and temperature. The rate coefficient for the termolecular association channel in the low-pressure limit, CIO + CIO (+M) --> ClOOCl (+M) (1), with N2 as a third body was measured over the temperature range 195-390 K and resulted in k1,N2(T) = (1.22 +/- 0.15) X 10(-33) exp{(833 +/- 34)/T} cm6 molecule-2 s-1 (+/- 2sigma error bounds). The 300 K rate coefficient for reaction 1 was measured for a number of bath gases. The results are k1,M (X 10(-32) CM6 molecule-2 S-1) = 0.99 +/- 0.05, 1.24 +/- 0.09, 1.71 +/- 0.06, 2.00 +/- 0.27, 2.60 +/- 0.17, 3.15 +/- 0.14, and 6.7 +/- 3.6 for He, O2, Ar, N2, CF4, SF6, and C12, respectively. The effective collision efficiency for M = C12 is very large and is likely due to a chaperone mechanism. Below 250 K, the reaction was in the falloff regime between second- and third-order kinetics. From the falloff data, the rate constant in the high-pressure limit, k(infinity)300, was estimated to be (6 +/- 2) X 10(-12) cm3 Molecule-I s-1. The Arrhenius expressions for the three bimolecular channels, ClO + ClO --> C12 + O2 (2), ClOO + Cl (3), and OClO + Cl (4), over the temperature range 260-390 K are k2(T) = (1.01 +/- 0.12) X 10(-12) exp{-(1590 +/- 100)/T} cm3 molecule-1 s-1, k3(T) = (2.98 +/- 0.68) X 10(-11) exp{-(2450 +/- 330)/71 CM3 molecule-1 s-1, and k4(T) = (3.50 +/- 0.31) X 10(-13) exp{-(1370 +/- 150)/71 CM3 molecule-1 s-1. These expressions lead to a value of (1.64 +/- 0.35) X 10(-14) cm3 molecule-1 s-I for the overall bimolecular rate constant (k2 + k3 + k4) at 298 K. The rate coefficient expression for ClOOCl thermal decomposition was determined to be k-1(T) = (9.81 +/- 1.32) X 10(-7) exp{-(7980 +/- 320)/T} cm3 molecule-1 s-1 over the range 260-310 K. From a Third Law analysis using equilibrium constants derived from measured values of k1 and k-1, the enthalpy of formation (DELTAH-degrees(f)(298)) of ClOOCl was determined to be 30.5 +/- 0.7 kcal mol-1. The equilibrium constant expression from this analysis is K(eq)(T) = (1.24 +/- 0.18) X 10(-27) exp{(8820 +/- 440)/T} cm3 molecule-1. From the observed activation energy for reaction 4 and the literature activation energy for reaction -4, the OClO enthalpy of formation was calculated to be 22.6 +/- 0.3 kcal mol-1. C1 JET PROP LAB,PASADENA,CA 91109. NR 44 TC 94 Z9 94 U1 0 U2 7 PU AMER CHEMICAL SOC PI WASHINGTON PA 1155 16TH ST, NW, WASHINGTON, DC 20036 SN 0022-3654 J9 J PHYS CHEM-US JI J. Phys. Chem. PD JAN 6 PY 1994 VL 98 IS 1 BP 155 EP 169 DI 10.1021/j100052a027 PG 15 WC Chemistry, Physical SC Chemistry GA MR068 UT WOS:A1994MR06800027 ER PT J AU CHAPMAN, CR MORRISON, D AF CHAPMAN, CR MORRISON, D TI IMPACTS ON THE EARTH BY ASTEROIDS AND COMETS - ASSESSING THE HAZARD SO NATURE LA English DT Review ID CRETACEOUS-TERTIARY BOUNDARY; NUCLEAR WINTER; RISK; AGES AB There is a 1-in-10,000 chance that a large (approximately 2-km diameter) asteroid or comet will collide with the Earth during the next century, disrupting the ecosphere and killing a large fraction of the world's population. Although impacts of this magnitude are so infrequent as to be beyond our personal experience, the long-term statistical hazard is comparable to that of many other, more familiar natural disasters, raising the question of whether mitigation measures should be considered. C1 NASA,AMES RES CTR,DIV SPACE SCI,MOFFETT FIELD,CA 94035. RP CHAPMAN, CR (reprint author), SCI APPLICAT INT CORP,INST PLANETARY SCI,620 N 6TH AVE,TUCSON,AZ 85705, USA. NR 65 TC 192 Z9 195 U1 6 U2 19 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 6 PY 1994 VL 367 IS 6458 BP 33 EP 40 DI 10.1038/367033a0 PG 8 WC Multidisciplinary Sciences SC Science & Technology - Other Topics GA MP865 UT WOS:A1994MP86500050 ER PT J AU DODELSON, S WIDROW, LM AF DODELSON, S WIDROW, LM TI STERILE NEUTRINOS AS DARK-MATTER SO PHYSICAL REVIEW LETTERS LA English DT Article ID LARGE-SCALE STRUCTURE; EARLY UNIVERSE; NUCLEOSYNTHESIS; OSCILLATIONS; BOUNDS AB The simplest model that can accommodate a viable nonbaryonic dark matter candidate is the standard electroweak theory with the addition of right-handed (sterile) neutrinos. We consider a single generation of neutrinos with a Dirac mass mu and a Majorana mass M for the right-handed component. If M >> mu (standard hot dark matter corresponds to M = 0), then sterile neutrinos are produced via oscillations in the early Universe with energy density independent of M. However, M is crucial in determining the large scale structure of the Universe; for M approximately 100 eV, sterile neutrinos make an excellent warm dark matter candidate. C1 QUEENS UNIV,DEPT PHYS,KINGSTON K7L 3N6,ONTARIO,CANADA. UNIV TORONTO,CANADIAN INST THEORET PHYS,TORONTO M5T 1A7,ON,CANADA. RP DODELSON, S (reprint author), FERMILAB NATL ACCELERATOR LAB,NASA,FERMILAB ASTROPHYS CTR,BATAVIA,IL 60510, USA. NR 29 TC 538 Z9 541 U1 1 U2 13 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 3 PY 1994 VL 72 IS 1 BP 17 EP 20 DI 10.1103/PhysRevLett.72.17 PG 4 WC Physics, Multidisciplinary SC Physics GA MP867 UT WOS:A1994MP86700005 ER PT B AU PHAM, C HARTON, PL SIMHAL, SK AF PHAM, C HARTON, PL SIMHAL, SK GP IEEE TI RADAR CROSS SECTION MEASUREMENTS IN SPACE SO 10TH ANNIVERSARY, IMTC/94 - ADVANCED TECHNOLOGIES IN I & M, CONFERENCE PROCEEDINGS, VOLS 1-3 AND SUPPLEMENT LA English DT Proceedings Paper CT 1994 IEEE Instrumentation and Measurement Technology Conference - Advanced Technologies in I and M (IMTC/94) CY MAY 10-12, 1994 CL HAMAMATSU, JAPAN SP IEEE, INSTRUMENTAT & MEASUREMENT SOC, SOC INSTRUMENT & CONTROL ENGINEERS, JAPAN C1 NATL AERONAUT & SPACE ADM,HOUSTON,TX 77058. 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 0-7803-1880-3 PY 1994 BP 44 EP 47 DI 10.1109/IMTC.1994.352131 PG 4 WC Instruments & Instrumentation SC Instruments & Instrumentation GA BC27G UT WOS:A1994BC27G00019 ER PT B AU LIU, Y AF LIU, Y BE Terzuoli, A TI A generalized finite-volume algorithm for solving the Maxwell equations on arbitrary grids SO 10TH ANNUAL REVIEW OF PROGRESS IN APPLIED COMPUTATIONAL ELECTROMAGNETICS, CONFERENCE PROCEEDINGS, VOL 1 LA English DT Proceedings Paper CT 10th Annual Review of Progress in Applied Computational Electromagnetics Conference CY MAR 21-26, 1994 CL MONTEREY, CA SP Appl Comp Electromagnet Soc, DOD, US DOE, IEEE, URSI, ASEE, SIAM, AMTA C1 NASA,AMES RES CTR,MOFFETT FIELD,CA 94035. NR 0 TC 1 Z9 1 U1 0 U2 0 PU 1994 A C E S Conference PI DAYTON PA PO BOX 3402, DAYTON, OH 45401 PY 1994 BP 487 EP 494 PG 8 WC Engineering, Electrical & Electronic SC Engineering GA BD46Z UT WOS:A1994BD46Z00060 ER PT B AU GOORJIAN, PM JOSEPH, RM TAFLOVE, A AF GOORJIAN, PM JOSEPH, RM TAFLOVE, A BE Terzuoli, A TI FD-TD algorithm for the nonlinear Maxwell's equations with applications to femtosecond soliton propagation SO 10TH ANNUAL REVIEW OF PROGRESS IN APPLIED COMPUTATIONAL ELECTROMAGNETICS, CONFERENCE PROCEEDINGS, VOL II LA English DT Proceedings Paper CT 10th Annual Review of Progress in Applied Computational Electromagnetics Conference CY MAR 21-26, 1994 CL MONTEREY, CA SP Appl Comp Electromagnet Soc, DOD, US DOE, IEEE, URSI, ASEE, SIAM, AMTA C1 NASA,AMES RES CTR,MOFFETT FIELD,CA 94035. NR 0 TC 0 Z9 0 U1 0 U2 0 PU 1994 A C E S Conference PI DAYTON PA PO BOX 3402, DAYTON, OH 45401 PY 1994 BP 2 EP 3 PG 2 WC Engineering, Electrical & Electronic SC Engineering GA BD47A UT WOS:A1994BD47A00001 ER PT B AU IMBRIALE, WA CWIK, T AF IMBRIALE, WA CWIK, T BE Terzuoli, A TI A simple physical optics algorithm perfect for parallel computing architecture SO 10TH ANNUAL REVIEW OF PROGRESS IN APPLIED COMPUTATIONAL ELECTROMAGNETICS, CONFERENCE PROCEEDINGS, VOL II LA English DT Proceedings Paper CT 10th Annual Review of Progress in Applied Computational Electromagnetics Conference CY MAR 21-26, 1994 CL MONTEREY, CA SP Appl Comp Electromagnet Soc, DOD, US DOE, IEEE, URSI, ASEE, SIAM, AMTA C1 CALTECH,JET PROP LAB,PASADENA,CA 91109. NR 0 TC 2 Z9 2 U1 0 U2 0 PU 1994 A C E S Conference PI DAYTON PA PO BOX 3402, DAYTON, OH 45401 PY 1994 BP 434 EP 441 PG 8 WC Engineering, Electrical & Electronic SC Engineering GA BD47A UT WOS:A1994BD47A00059 ER PT B AU BROWN, L CRISP, D CRISP, J BYKOV, A NAUMENKO, O SINITSA, L AF BROWN, L CRISP, D CRISP, J BYKOV, A NAUMENKO, O SINITSA, L BE Nadezhdinskii, AI Ponomarev, YN Sinitsa, LN TI FOURIER-TRANSFORM SPECTRUM OF H2S IN 2000-9000 CM-1 SO 11TH SYMPOSIUM AND SCHOOL ON HIGH-RESOLUTION MOLECULAR SPECTROSCOPY SE PROCEEDINGS OF THE SOCIETY OF PHOTO-OPTICAL INSTRUMENTATION ENGINEERS (SPIE) LA English DT Proceedings Paper CT 11th Symposium and School on High-Resolution Molecular Spectroscopy (HighRus-93) CY JUN 28-JUL 03, 1993 CL MOSCOW, RUSSIA SP SOC PHOTO OPT INSTRUMENTAT ENGINEERS, RUSSIA CHAPTER, INST ATMOSPHER OPT, RUSSIA, GEN PHYS INST, RUSSIA, RUSSIAN ACAD SCI, SCI COUNCIL SPECT, RUSSIAN ACAD SCI, ATMOSPHER SPECT WORKING GRP RADIAT COMMISS 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 0-8194-1504-9 J9 P SOC PHOTO-OPT INS PY 1994 VL 2205 BP 238 EP 243 DI 10.1117/12.166213 PG 6 WC Spectroscopy SC Spectroscopy GA BZ74R UT WOS:A1994BZ74R00030 ER PT B AU MINER, PS PUELLELA, S JOHNSON, SD AF MINER, PS PUELLELA, S JOHNSON, SD GP IEEE TI INTERACTION OF FORMAL DESIGN SYSTEMS IN THE DEVELOPMENT OF A FAULT-TOLERANT CLOCK SYNCHRONIZATION CIRCUIT SO 13TH SYMPOSIUM ON RELIABLE DISTRIBUTED SYSTEMS, PROCEEDINGS LA English DT Proceedings Paper CT 13th Symposium on Reliable Distributed Systems CY OCT 25-27, 1994 CL DANA POINT, CA SP IEEE, COMP SOC, TECH COMM DISTRIBUTED PROC, IEEE, COMP SOC, TECH COMM FAULT TOLERANT COMP, IFIP, WG 10 4 DEPENDABLE COMP C1 NASA,LANGLEY RES CTR,HAMPTON,VA 23665. NR 0 TC 1 Z9 1 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 0-8186-6575-0 PY 1994 BP 128 EP 137 DI 10.1109/RELDIS.1994.336902 PG 10 WC Computer Science, Theory & Methods SC Computer Science GA BC12Q UT WOS:A1994BC12Q00013 ER PT B AU CHADWICK, OA OLSON, CG HENDRICKS, DM KELLY, EF GAVENDA, RT AF CHADWICK, OA OLSON, CG HENDRICKS, DM KELLY, EF GAVENDA, RT BE Etchevers, JD TI Quantifying climatic effects on mineral weathering and neoformation in Hawaii SO 15TH WORLD CONGRESS OF SOIL SCIENCE, VOL 8A, TRANSACTIONS: COMMISSION VII: SYMPOSIA LA English DT Proceedings Paper CT 15th World Congress of Soil Science CY JUL 10-16, 1994 CL ACAPULCO, MEXICO SP Int Soc Soil Sci, Mexican Soc Soil Sci C1 CALTECH,JPL,PASADENA,CA. NR 0 TC 0 Z9 0 U1 1 U2 2 PU INTERNATIONAL SOCIETY SOIL SCIENCE PI WAGENINGEN PA POSTBUS 353, 6700AJ WAGENINGEN, NETHERLANDS PY 1994 BP 94 EP 105 PG 12 WC Agronomy; Geography; Geology; Soil Science SC Agriculture; Geography; Geology GA BD60E UT WOS:A1994BD60E00009 ER PT B AU DECKER, HJ HANDSCHUH, RF ZAKRAJSEK, JJ AF DECKER, HJ HANDSCHUH, RF ZAKRAJSEK, JJ GP VIBRAT INST TI AN ENHANCEMENT TO THE NA4 GEAR VIBRATION DIAGNOSTIC PARAMETER SO 18TH ANNUAL MEETING PROCEEDINGS VIBRATION INSTITUTE LA English DT Proceedings Paper CT 18th Annual Meeting of the Vibration-Institute CY JUN 21-23, 1994 CL HERSHEY, PA SP VIBRAT INST C1 USA,RES LAB,LEWIS RES CTR,LEWIS RES CTR,PROP DIRECTORATE,CLEVELAND,OH 44035. NR 0 TC 0 Z9 0 U1 0 U2 0 PU VIBRATION INST PI CLARENDON PA 101 W 55TH ST, CLARENDON, IL 60514 PY 1994 BP 259 EP 265 PG 7 WC Engineering, Mechanical SC Engineering GA BC63G UT WOS:A1994BC63G00034 ER PT S AU PISZCZOR, MF KOHOUT, LL MANZO, M COLOZZA, AJ AF PISZCZOR, MF KOHOUT, LL MANZO, M COLOZZA, AJ GP IEEE TI Development and operation of a photovoltaic power system for use at remote Antarctic sites SO 1994 IEEE FIRST WORLD CONFERENCE ON PHOTOVOLTAIC ENERGY CONVERSION/CONFERENCE RECORD OF THE TWENTY FOURTH IEEE PHOTOVOLTAIC SPECIALISTS CONFERENCE-1994, VOLS I AND II SE IEEE PHOTOVOLTAIC SPECIALISTS CONFERENCE LA English DT Proceedings Paper CT 1994 IEEE 1st World Conference on Photovoltaic Energy Conversion/24th IEEE Photovoltaic Specialists Conference-1994 CY DEC 05-09, 1994 CL WAIKOLOA, HI SP IEEE Electron Devices Soc C1 NASA,LEWIS RES CTR,CLEVELAND,OH 44135. 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 SN 0160-8371 BN 0-7803-1460-3 J9 IEEE PHOT SPEC CONF PY 1994 BP 1145 EP 1148 PG 4 WC Engineering, Aerospace; Energy & Fuels; Engineering, Electrical & Electronic; Materials Science, Coatings & Films; Materials Science, Composites SC Engineering; Energy & Fuels; Materials Science GA BE14U UT WOS:A1994BE14U00273 ER PT S AU YATER, JA WEINBERG, I JENKINS, PP LANDIS, GA AF YATER, JA WEINBERG, I JENKINS, PP LANDIS, GA GP IEEE TI Minority-carrier lifetime in InP as a function of light bias SO 1994 IEEE FIRST WORLD CONFERENCE ON PHOTOVOLTAIC ENERGY CONVERSION/CONFERENCE RECORD OF THE TWENTY FOURTH IEEE PHOTOVOLTAIC SPECIALISTS CONFERENCE-1994, VOLS I AND II SE IEEE PHOTOVOLTAIC SPECIALISTS CONFERENCE LA English DT Proceedings Paper CT 1994 IEEE 1st World Conference on Photovoltaic Energy Conversion/24th IEEE Photovoltaic Specialists Conference-1994 CY DEC 05-09, 1994 CL WAIKOLOA, HI SP IEEE Electron Devices Soc C1 NASA,LEWIS RES CTR,CLEVELAND,OH 44135. NR 0 TC 1 Z9 1 U1 1 U2 1 PU I E E E PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 SN 0160-8371 BN 0-7803-1460-3 J9 IEEE PHOT SPEC CONF PY 1994 BP 1709 EP 1712 PG 4 WC Engineering, Aerospace; Energy & Fuels; Engineering, Electrical & Electronic; Materials Science, Coatings & Films; Materials Science, Composites SC Engineering; Energy & Fuels; Materials Science GA BE14U UT WOS:A1994BE14U00407 ER PT S AU WILT, DM BRINKER, DJ FATEMI, NS HOFFMAN, RW JENKINS, PP LOWE, R AF WILT, DM BRINKER, DJ FATEMI, NS HOFFMAN, RW JENKINS, PP LOWE, R GP IEEE TI Lattice mismatched InGaAs photovoltaic devices for thermophotovoltaic power systems SO 1994 IEEE FIRST WORLD CONFERENCE ON PHOTOVOLTAIC ENERGY CONVERSION/CONFERENCE RECORD OF THE TWENTY FOURTH IEEE PHOTOVOLTAIC SPECIALISTS CONFERENCE-1994, VOLS I AND II SE IEEE PHOTOVOLTAIC SPECIALISTS CONFERENCE LA English DT Proceedings Paper CT 1994 IEEE 1st World Conference on Photovoltaic Energy Conversion/24th IEEE Photovoltaic Specialists Conference-1994 CY DEC 05-09, 1994 CL WAIKOLOA, HI 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 0-7803-1460-3 J9 IEEE PHOT SPEC CONF PY 1994 BP 1738 EP 1741 PG 4 WC Engineering, Aerospace; Energy & Fuels; Engineering, Electrical & Electronic; Materials Science, Coatings & Films; Materials Science, Composites SC Engineering; Energy & Fuels; Materials Science GA BE14U UT WOS:A1994BE14U00414 ER PT S AU FAUR, M FAUR, M FLOOD, DJ JENKINS, PP GORADIA, M WILT, DM AF FAUR, M FAUR, M FLOOD, DJ JENKINS, PP GORADIA, M WILT, DM GP IEEE IEEE IEEE TI ELECTROCHEMICAL CHARACTERIZATION OF INP AND GAAS BASED STRUCTURES FOR SPACE SOLAR-CELL APPLICATIONS SO 1994 IEEE FIRST WORLD CONFERENCE ON PHOTOVOLTAIC ENERGY CONVERSION/CONFERENCE RECORD OF THE TWENTY FOURTH IEEE PHOTOVOLTAIC SPECIALISTS CONFERENCE-1994, VOLS I AND II SE IEEE Photovoltaic Specialists Conference LA English DT Proceedings Paper CT 1994 IEEE 1st World Conference on Photovoltaic Energy Conversion/24th IEEE Photovoltaic Specialists Conference-1994 CY DEC 05-09, 1994 CL WAIKOLOA, HI SP IEEE Electron Devices Soc C1 NASA, LEWIS RES CTR, CLEVELAND, OH 44135 USA. NR 0 TC 0 Z9 0 U1 0 U2 1 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA SN 0160-8371 BN 0-7803-1460-3 J9 IEEE PHOT SPEC CONF PY 1994 BP 1775 EP 1778 PG 4 WC Engineering, Aerospace; Energy & Fuels; Engineering, Electrical & Electronic; Materials Science, Coatings & Films; Materials Science, Composites SC Engineering; Energy & Fuels; Materials Science GA BE14U UT WOS:A1994BE14U00423 ER PT S AU BURGER, DR MUELLER, RL AF BURGER, DR MUELLER, RL GP IEEE TI Thermophotovoltaic system parametric modelling SO 1994 IEEE FIRST WORLD CONFERENCE ON PHOTOVOLTAIC ENERGY CONVERSION/CONFERENCE RECORD OF THE TWENTY FOURTH IEEE PHOTOVOLTAIC SPECIALISTS CONFERENCE-1994, VOLS I AND II SE IEEE PHOTOVOLTAIC SPECIALISTS CONFERENCE LA English DT Proceedings Paper CT 1994 IEEE 1st World Conference on Photovoltaic Energy Conversion/24th IEEE Photovoltaic Specialists Conference-1994 CY DEC 05-09, 1994 CL WAIKOLOA, HI SP IEEE Electron Devices Soc C1 CALTECH,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 0-7803-1460-3 J9 IEEE PHOT SPEC CONF PY 1994 BP 1863 EP 1866 PG 4 WC Engineering, Aerospace; Energy & Fuels; Engineering, Electrical & Electronic; Materials Science, Coatings & Films; Materials Science, Composites SC Engineering; Energy & Fuels; Materials Science GA BE14U UT WOS:A1994BE14U00445 ER PT S AU JAIN, RK LANDIS, GA AF JAIN, RK LANDIS, GA GP IEEE TI Transient response of gallium arsenide and silicon solar cells under laser pulse SO 1994 IEEE FIRST WORLD CONFERENCE ON PHOTOVOLTAIC ENERGY CONVERSION/CONFERENCE RECORD OF THE TWENTY FOURTH IEEE PHOTOVOLTAIC SPECIALISTS CONFERENCE-1994, VOLS I AND II SE IEEE PHOTOVOLTAIC SPECIALISTS CONFERENCE LA English DT Proceedings Paper CT 1994 IEEE 1st World Conference on Photovoltaic Energy Conversion/24th IEEE Photovoltaic Specialists Conference-1994 CY DEC 05-09, 1994 CL WAIKOLOA, HI SP IEEE Electron Devices Soc C1 NASA,LEWIS RES CTR,CLEVELAND,OH 44135. NR 0 TC 1 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 0-7803-1460-3 J9 IEEE PHOT SPEC CONF PY 1994 BP 1874 EP 1877 PG 4 WC Engineering, Aerospace; Energy & Fuels; Engineering, Electrical & Electronic; Materials Science, Coatings & Films; Materials Science, Composites SC Engineering; Energy & Fuels; Materials Science GA BE14U UT WOS:A1994BE14U00448 ER PT S AU KRUER, M AF KRUER, M GP IEEE TI The FAST solar array: Challenging requirements, novel design SO 1994 IEEE FIRST WORLD CONFERENCE ON PHOTOVOLTAIC ENERGY CONVERSION/CONFERENCE RECORD OF THE TWENTY FOURTH IEEE PHOTOVOLTAIC SPECIALISTS CONFERENCE-1994, VOLS I AND II SE IEEE PHOTOVOLTAIC SPECIALISTS CONFERENCE LA English DT Proceedings Paper CT 1994 IEEE 1st World Conference on Photovoltaic Energy Conversion/24th IEEE Photovoltaic Specialists Conference-1994 CY DEC 05-09, 1994 CL WAIKOLOA, HI SP IEEE Electron Devices Soc C1 GODDARD SPACE FLIGHT CTR,GREENBELT,MD. 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 0-7803-1460-3 J9 IEEE PHOT SPEC CONF PY 1994 BP 1949 EP 1956 PG 8 WC Engineering, Aerospace; Energy & Fuels; Engineering, Electrical & Electronic; Materials Science, Coatings & Films; Materials Science, Composites SC Engineering; Energy & Fuels; Materials Science GA BE14U UT WOS:A1994BE14U00467 ER PT S AU GADDY, EM AF GADDY, EM GP IEEE TI Results from the Goddard Space Flight Center's long duration exposure facility solar array component test SO 1994 IEEE FIRST WORLD CONFERENCE ON PHOTOVOLTAIC ENERGY CONVERSION/CONFERENCE RECORD OF THE TWENTY FOURTH IEEE PHOTOVOLTAIC SPECIALISTS CONFERENCE-1994, VOLS I AND II SE IEEE PHOTOVOLTAIC SPECIALISTS CONFERENCE LA English DT Proceedings Paper CT 1994 IEEE 1st World Conference on Photovoltaic Energy Conversion/24th IEEE Photovoltaic Specialists Conference-1994 CY DEC 05-09, 1994 CL WAIKOLOA, HI SP IEEE Electron Devices Soc C1 NASA,GODDARD SPACE FLIGHT CTR,GREENBELT,MD 20771. 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 0-7803-1460-3 J9 IEEE PHOT SPEC CONF PY 1994 BP 1982 EP 1985 PG 4 WC Engineering, Aerospace; Energy & Fuels; Engineering, Electrical & Electronic; Materials Science, Coatings & Films; Materials Science, Composites SC Engineering; Energy & Fuels; Materials Science GA BE14U UT WOS:A1994BE14U00472 ER PT S AU BAILEY, SG LANDIS, GA AF BAILEY, SG LANDIS, GA GP IEEE TI Use of advanced solar cells for commercial communication satellites SO 1994 IEEE FIRST WORLD CONFERENCE ON PHOTOVOLTAIC ENERGY CONVERSION/CONFERENCE RECORD OF THE TWENTY FOURTH IEEE PHOTOVOLTAIC SPECIALISTS CONFERENCE-1994, VOLS I AND II SE IEEE PHOTOVOLTAIC SPECIALISTS CONFERENCE LA English DT Proceedings Paper CT 1994 IEEE 1st World Conference on Photovoltaic Energy Conversion/24th IEEE Photovoltaic Specialists Conference-1994 CY DEC 05-09, 1994 CL WAIKOLOA, HI SP IEEE Electron Devices Soc C1 NASA,LEWIS RES CTR,CLEVELAND,OH 44135. NR 0 TC 3 Z9 3 U1 1 U2 1 PU I E E E PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 SN 0160-8371 BN 0-7803-1460-3 J9 IEEE PHOT SPEC CONF PY 1994 BP 2002 EP 2005 PG 4 WC Engineering, Aerospace; Energy & Fuels; Engineering, Electrical & Electronic; Materials Science, Coatings & Films; Materials Science, Composites SC Engineering; Energy & Fuels; Materials Science GA BE14U UT WOS:A1994BE14U00477 ER PT S AU PISZCZOR, MF ONEILL, MJ FRAAS, LM AF PISZCZOR, MF ONEILL, MJ FRAAS, LM GP IEEE TI Development of a line-focus refractive concentrator array for space applications SO 1994 IEEE FIRST WORLD CONFERENCE ON PHOTOVOLTAIC ENERGY CONVERSION/CONFERENCE RECORD OF THE TWENTY FOURTH IEEE PHOTOVOLTAIC SPECIALISTS CONFERENCE-1994, VOLS I AND II SE IEEE PHOTOVOLTAIC SPECIALISTS CONFERENCE LA English DT Proceedings Paper CT 1994 IEEE 1st World Conference on Photovoltaic Energy Conversion/24th IEEE Photovoltaic Specialists Conference-1994 CY DEC 05-09, 1994 CL WAIKOLOA, HI SP IEEE Electron Devices Soc C1 NASA,LEWIS RES CTR,CLEVELAND,OH 44135. 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 0-7803-1460-3 J9 IEEE PHOT SPEC CONF PY 1994 BP 2022 EP 2025 PG 4 WC Engineering, Aerospace; Energy & Fuels; Engineering, Electrical & Electronic; Materials Science, Coatings & Films; Materials Science, Composites SC Engineering; Energy & Fuels; Materials Science GA BE14U UT WOS:A1994BE14U00482 ER PT S AU LANDIS, GA AF LANDIS, GA GP IEEE TI Dust-induced degradation of solar arrays on Mars SO 1994 IEEE FIRST WORLD CONFERENCE ON PHOTOVOLTAIC ENERGY CONVERSION/CONFERENCE RECORD OF THE TWENTY FOURTH IEEE PHOTOVOLTAIC SPECIALISTS CONFERENCE-1994, VOLS I AND II SE IEEE PHOTOVOLTAIC SPECIALISTS CONFERENCE LA English DT Proceedings Paper CT 1994 IEEE 1st World Conference on Photovoltaic Energy Conversion/24th IEEE Photovoltaic Specialists Conference-1994 CY DEC 05-09, 1994 CL WAIKOLOA, HI SP IEEE Electron Devices Soc C1 NASA,LEWIS RES CTR,NYMA INC,CLEVELAND,OH 44135. NR 0 TC 4 Z9 4 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 0-7803-1460-3 J9 IEEE PHOT SPEC CONF PY 1994 BP 2030 EP 2033 PG 4 WC Engineering, Aerospace; Energy & Fuels; Engineering, Electrical & Electronic; Materials Science, Coatings & Films; Materials Science, Composites SC Engineering; Energy & Fuels; Materials Science GA BE14U UT WOS:A1994BE14U00484 ER PT S AU MUELLER, RL WALLACE, MT ILES, P AF MUELLER, RL WALLACE, MT ILES, P GP IEEE TI Scaling nominal solar cell impedances for array design SO 1994 IEEE FIRST WORLD CONFERENCE ON PHOTOVOLTAIC ENERGY CONVERSION/CONFERENCE RECORD OF THE TWENTY FOURTH IEEE PHOTOVOLTAIC SPECIALISTS CONFERENCE-1994, VOLS I AND II SE IEEE PHOTOVOLTAIC SPECIALISTS CONFERENCE LA English DT Proceedings Paper CT 1994 IEEE 1st World Conference on Photovoltaic Energy Conversion/24th IEEE Photovoltaic Specialists Conference-1994 CY DEC 05-09, 1994 CL WAIKOLOA, HI SP IEEE Electron Devices Soc C1 CALTECH,JET PROP LAB,PASADENA,CA 91109. NR 0 TC 6 Z9 6 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 0-7803-1460-3 J9 IEEE PHOT SPEC CONF PY 1994 BP 2034 EP 2037 PG 4 WC Engineering, Aerospace; Energy & Fuels; Engineering, Electrical & Electronic; Materials Science, Coatings & Films; Materials Science, Composites SC Engineering; Energy & Fuels; Materials Science GA BE14U UT WOS:A1994BE14U00485 ER PT S AU STELLA, PM POOL, FS NICOLET, MA ILES, PA AF STELLA, PM POOL, FS NICOLET, MA ILES, PA GP IEEE TI PV technology for low intensity, low temperature (LILT) applications SO 1994 IEEE FIRST WORLD CONFERENCE ON PHOTOVOLTAIC ENERGY CONVERSION/CONFERENCE RECORD OF THE TWENTY FOURTH IEEE PHOTOVOLTAIC SPECIALISTS CONFERENCE-1994, VOLS I AND II SE IEEE PHOTOVOLTAIC SPECIALISTS CONFERENCE LA English DT Proceedings Paper CT 1994 IEEE 1st World Conference on Photovoltaic Energy Conversion/24th IEEE Photovoltaic Specialists Conference-1994 CY DEC 05-09, 1994 CL WAIKOLOA, HI SP IEEE Electron Devices Soc C1 CALTECH,JET PROP LAB,PASADENA,CA 91109. NR 0 TC 2 Z9 2 U1 1 U2 1 PU I E E E PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 SN 0160-8371 BN 0-7803-1460-3 J9 IEEE PHOT SPEC CONF PY 1994 BP 2082 EP 2087 PG 6 WC Engineering, Aerospace; Energy & Fuels; Engineering, Electrical & Electronic; Materials Science, Coatings & Films; Materials Science, Composites SC Engineering; Energy & Fuels; Materials Science GA BE14U UT WOS:A1994BE14U00496 ER PT S AU BRINKER, DJ HICKEY, JR AF BRINKER, DJ HICKEY, JR GP IEEE TI Final results of the Advanced Photovoltaic Experiment flight test SO 1994 IEEE FIRST WORLD CONFERENCE ON PHOTOVOLTAIC ENERGY CONVERSION/CONFERENCE RECORD OF THE TWENTY FOURTH IEEE PHOTOVOLTAIC SPECIALISTS CONFERENCE-1994, VOLS I AND II SE IEEE PHOTOVOLTAIC SPECIALISTS CONFERENCE LA English DT Proceedings Paper CT 1994 IEEE 1st World Conference on Photovoltaic Energy Conversion/24th IEEE Photovoltaic Specialists Conference-1994 CY DEC 05-09, 1994 CL WAIKOLOA, HI 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 0-7803-1460-3 J9 IEEE PHOT SPEC CONF PY 1994 BP 2104 EP 2107 PG 4 WC Engineering, Aerospace; Energy & Fuels; Engineering, Electrical & Electronic; Materials Science, Coatings & Films; Materials Science, Composites SC Engineering; Energy & Fuels; Materials Science GA BE14U UT WOS:A1994BE14U00500 ER PT S AU JAIN, RK WEINBERG, I BRINKER, DJ SCHEIMAN, DA VARGASABURTO, C SWARTZ, CK AF JAIN, RK WEINBERG, I BRINKER, DJ SCHEIMAN, DA VARGASABURTO, C SWARTZ, CK GP IEEE TI Electron and proton damage coefficients for heteroepitaxial InP solar cells SO 1994 IEEE FIRST WORLD CONFERENCE ON PHOTOVOLTAIC ENERGY CONVERSION/CONFERENCE RECORD OF THE TWENTY FOURTH IEEE PHOTOVOLTAIC SPECIALISTS CONFERENCE-1994, VOLS I AND II SE IEEE PHOTOVOLTAIC SPECIALISTS CONFERENCE LA English DT Proceedings Paper CT 1994 IEEE 1st World Conference on Photovoltaic Energy Conversion/24th IEEE Photovoltaic Specialists Conference-1994 CY DEC 05-09, 1994 CL WAIKOLOA, HI 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 0-7803-1460-3 J9 IEEE PHOT SPEC CONF PY 1994 BP 2112 EP 2115 PG 4 WC Engineering, Aerospace; Energy & Fuels; Engineering, Electrical & Electronic; Materials Science, Coatings & Films; Materials Science, Composites SC Engineering; Energy & Fuels; Materials Science GA BE14U UT WOS:A1994BE14U00502 ER PT S AU CURTIS, H PISZCZOR, M SEVERANCE, P GUIDICE, D OLSON, D AF CURTIS, H PISZCZOR, M SEVERANCE, P GUIDICE, D OLSON, D GP IEEE TI Early results from the PASP Plus flight experiment SO 1994 IEEE FIRST WORLD CONFERENCE ON PHOTOVOLTAIC ENERGY CONVERSION/CONFERENCE RECORD OF THE TWENTY FOURTH IEEE PHOTOVOLTAIC SPECIALISTS CONFERENCE-1994, VOLS I AND II SE IEEE PHOTOVOLTAIC SPECIALISTS CONFERENCE LA English DT Proceedings Paper CT 1994 IEEE 1st World Conference on Photovoltaic Energy Conversion/24th IEEE Photovoltaic Specialists Conference-1994 CY DEC 05-09, 1994 CL WAIKOLOA, HI SP IEEE Electron Devices Soc C1 NASA,LEWIS RES CTR,CLEVELAND,OH 44135. 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 SN 0160-8371 BN 0-7803-1460-3 J9 IEEE PHOT SPEC CONF PY 1994 BP 2169 EP 2172 PG 4 WC Engineering, Aerospace; Energy & Fuels; Engineering, Electrical & Electronic; Materials Science, Coatings & Films; Materials Science, Composites SC Engineering; Energy & Fuels; Materials Science GA BE14U UT WOS:A1994BE14U00516 ER PT S AU WEINBERG, I JAIN, RK VARGASABURTO, C WILT, DM SCHEIMAN, DA AF WEINBERG, I JAIN, RK VARGASABURTO, C WILT, DM SCHEIMAN, DA GP IEEE TI Performance of Ga0.47In0.53As cells over a range of proton energies SO 1994 IEEE FIRST WORLD CONFERENCE ON PHOTOVOLTAIC ENERGY CONVERSION/CONFERENCE RECORD OF THE TWENTY FOURTH IEEE PHOTOVOLTAIC SPECIALISTS CONFERENCE-1994, VOLS I AND II SE IEEE PHOTOVOLTAIC SPECIALISTS CONFERENCE LA English DT Proceedings Paper CT 1994 IEEE 1st World Conference on Photovoltaic Energy Conversion/24th IEEE Photovoltaic Specialists Conference-1994 CY DEC 05-09, 1994 CL WAIKOLOA, HI 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 0-7803-1460-3 J9 IEEE PHOT SPEC CONF PY 1994 BP 2173 EP 2176 PG 4 WC Engineering, Aerospace; Energy & Fuels; Engineering, Electrical & Electronic; Materials Science, Coatings & Films; Materials Science, Composites SC Engineering; Energy & Fuels; Materials Science GA BE14U UT WOS:A1994BE14U00517 ER PT S AU YATER, JA LOWE, RA JENKINS, PP LANDIS, GA AF YATER, JA LOWE, RA JENKINS, PP LANDIS, GA GP IEEE TI Pulsed laser illumination of photovoltaic cells SO 1994 IEEE FIRST WORLD CONFERENCE ON PHOTOVOLTAIC ENERGY CONVERSION/CONFERENCE RECORD OF THE TWENTY FOURTH IEEE PHOTOVOLTAIC SPECIALISTS CONFERENCE-1994, VOLS I AND II SE IEEE PHOTOVOLTAIC SPECIALISTS CONFERENCE LA English DT Proceedings Paper CT 1994 IEEE 1st World Conference on Photovoltaic Energy Conversion/24th IEEE Photovoltaic Specialists Conference-1994 CY DEC 05-09, 1994 CL WAIKOLOA, HI SP IEEE Electron Devices Soc C1 NASA,LEWIS RES CTR,CLEVELAND,OH 44135. NR 0 TC 1 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 0-7803-1460-3 J9 IEEE PHOT SPEC CONF PY 1994 BP 2177 EP 2180 PG 4 WC Engineering, Aerospace; Energy & Fuels; Engineering, Electrical & Electronic; Materials Science, Coatings & Films; Materials Science, Composites SC Engineering; Energy & Fuels; Materials Science GA BE14U UT WOS:A1994BE14U00518 ER PT S AU JENKINS, P SCHEIMAN, D BRINKER, D AF JENKINS, P SCHEIMAN, D BRINKER, D GP IEEE TI Predicting short circuit current of single junction and multi-junction solar cells at low temperature for planetary missions. SO 1994 IEEE FIRST WORLD CONFERENCE ON PHOTOVOLTAIC ENERGY CONVERSION/CONFERENCE RECORD OF THE TWENTY FOURTH IEEE PHOTOVOLTAIC SPECIALISTS CONFERENCE-1994, VOLS I AND II SE IEEE PHOTOVOLTAIC SPECIALISTS CONFERENCE LA English DT Proceedings Paper CT 1994 IEEE 1st World Conference on Photovoltaic Energy Conversion/24th IEEE Photovoltaic Specialists Conference-1994 CY DEC 05-09, 1994 CL WAIKOLOA, HI SP IEEE Electron Devices Soc C1 NASA,LEWIS RES CTR,NYMA SETAR,CLEVELAND,OH 44135. NR 0 TC 0 Z9 0 U1 0 U2 2 PU I E E E PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 SN 0160-8371 BN 0-7803-1460-3 J9 IEEE PHOT SPEC CONF PY 1994 BP 2228 EP 2231 PG 4 WC Engineering, Aerospace; Energy & Fuels; Engineering, Electrical & Electronic; Materials Science, Coatings & Films; Materials Science, Composites SC Engineering; Energy & Fuels; Materials Science GA BE14U UT WOS:A1994BE14U00531 ER PT B AU NGUYEN, TM YEH, HG AF NGUYEN, TM YEH, HG GP IEEE TI BEHAVIOR OF PCM/PM/NRZ RECEIVERS IN NON-IDEAL CHANNELS - THE SEPARATE EFFECTS OF IMPERFECT DATA STREAMS AND BANDLIMITING CHANNELS ON PERFORMANCE SO 1994 IEEE GLOBECOM - CONFERENCE RECORD, VOLS 1-3, AND COMMUNICATIONS THEORY MINI-CONFERENCE RECORD: COMMUNICATIONS: THE GLOBAL BRIDGE LA English DT Proceedings Paper CT 1994 IEEE GLOBECOM - Communications, the Global Bridge CY NOV 28-DEC 02, 1994 CL SAN FRANCISCO, CA SP IEEE, COMMUN SOC, ALCATEL NETWORK SYST, DIGITAL SWITCH CORP, ELECTROHOME LTD, HEWLETT PACKARD LABS, PACIFIC BELL, SPRINT, SUN MICROSYST, TELLABS OPERAT INC, TEXAS INSTRUMENTS INC, NO TELECOM INC, AT&T NETWORK SYST, BECHTEL, NEC AMER INC, PIRELLI CABLE CORP 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 0-7803-1820-X PY 1994 BP 1380 EP 1384 PG 5 WC Telecommunications SC Telecommunications GA BC88U UT WOS:A1994BC88U00259 ER PT B AU NACHTSHEIM, PR AF NACHTSHEIM, PR GP IEEE TI A 1ST ORDER ADAPTIVE LEARNING RATE ALGORITHM FOR BACK PROPAGATION NETWORKS SO 1994 IEEE INTERNATIONAL CONFERENCE ON NEURAL NETWORKS, VOL 1-7 LA English DT Proceedings Paper CT 1994 IEEE International Conference on Neural Networks (ICNN 94) - 1st IEEE World Congress on Computational Intelligence CY JUN 26-29, 1994 CL ORLANDO, FL SP IEEE, NEURAL NETWORKS COUNCIL, IEEE, ORLANDO SECT C1 NASA,ARC,DIV INFORMAT SCI,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 0-7803-1901-X PY 1994 BP 257 EP 262 PG 6 WC Automation & Control Systems; Computer Science, Artificial Intelligence SC Automation & Control Systems; Computer Science GA BC54C UT WOS:A1994BC54C00045 ER PT B AU DUONG, T KEMENY, S TRAN, M DAUD, T THAKOOR, A LUDWIG, D SAUNDERS, C CARSON, J AF DUONG, T KEMENY, S TRAN, M DAUD, T THAKOOR, A LUDWIG, D SAUNDERS, C CARSON, J GP IEEE TI LOW POWER ANALOG NEUROSYNAPSE CHIPS FOR A 3-D SUGARCUBE NEUROPROCESSOR SO 1994 IEEE INTERNATIONAL CONFERENCE ON NEURAL NETWORKS, VOL 1-7 LA English DT Proceedings Paper CT 1994 IEEE International Conference on Neural Networks (ICNN 94) - 1st IEEE World Congress on Computational Intelligence CY JUN 26-29, 1994 CL ORLANDO, FL SP IEEE, NEURAL NETWORKS COUNCIL, IEEE, ORLANDO SECT C1 JET PROP LAB,CTR SPACE MICROELECTR TECHNOL,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 0-7803-1901-X PY 1994 BP 1907 EP 1911 PG 5 WC Automation & Control Systems; Computer Science, Artificial Intelligence SC Automation & Control Systems; Computer Science GA BC54C UT WOS:A1994BC54C00356 ER PT B AU LEE, S AF LEE, S GP IEEE TI SENSOR-KNOWLEDGE-COMMAND FUSION NETWORK FOR INTELLIGENT ROBOTICS SO 1994 IEEE INTERNATIONAL CONFERENCE ON NEURAL NETWORKS, VOL 1-7 LA English DT Proceedings Paper CT 1994 IEEE International Conference on Neural Networks (ICNN 94) - 1st IEEE World Congress on Computational Intelligence CY JUN 26-29, 1994 CL ORLANDO, FL SP IEEE, NEURAL NETWORKS COUNCIL, IEEE, ORLANDO SECT 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 0-7803-1901-X PY 1994 BP 2696 EP 2702 PG 7 WC Automation & Control Systems; Computer Science, Artificial Intelligence SC Automation & Control Systems; Computer Science GA BC54C UT WOS:A1994BC54C00505 ER PT B AU VENKATARAMAN, ST GULATI, S BARHEN, J AF VENKATARAMAN, ST GULATI, S BARHEN, J GP IEEE TI CONTROL OF SPACE ROBOTS IN UNCERTAIN ENVIRONMENTS USING NEURAL NETWORKS SO 1994 IEEE INTERNATIONAL CONFERENCE ON NEURAL NETWORKS, VOL 1-7 LA English DT Proceedings Paper CT 1994 IEEE International Conference on Neural Networks (ICNN 94) - 1st IEEE World Congress on Computational Intelligence CY JUN 26-29, 1994 CL ORLANDO, FL SP IEEE, NEURAL NETWORKS COUNCIL, IEEE, ORLANDO SECT C1 CALTECH,JPL,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 0-7803-1901-X PY 1994 BP 2869 EP 2874 PG 6 WC Automation & Control Systems; Computer Science, Artificial Intelligence SC Automation & Control Systems; Computer Science GA BC54C UT WOS:A1994BC54C00535 ER PT B AU LEE, S SHIMOJI, S AF LEE, S SHIMOJI, S GP IEEE TI SELF-ORGANIZATION OF PROBABILISTIC NETWORK WITH GAUSSIAN MIXTURE MODEL SO 1994 IEEE INTERNATIONAL CONFERENCE ON NEURAL NETWORKS, VOL 1-7 LA English DT Proceedings Paper CT 1994 IEEE International Conference on Neural Networks (ICNN 94) - 1st IEEE World Congress on Computational Intelligence CY JUN 26-29, 1994 CL ORLANDO, FL SP IEEE, NEURAL NETWORKS COUNCIL, IEEE, ORLANDO SECT 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 0-7803-1901-X PY 1994 BP 3088 EP 3093 PG 6 WC Automation & Control Systems; Computer Science, Artificial Intelligence SC Automation & Control Systems; Computer Science GA BC54C UT WOS:A1994BC54C00576 ER PT B AU MOTTER, MA PRINCIPE, JC AF MOTTER, MA PRINCIPE, JC GP IEEE TI A GAMMA-MEMORY NEURAL NETWORK FOR SYSTEM IDENTIFICATION SO 1994 IEEE INTERNATIONAL CONFERENCE ON NEURAL NETWORKS, VOL 1-7 LA English DT Proceedings Paper CT 1994 IEEE International Conference on Neural Networks (ICNN 94) - 1st IEEE World Congress on Computational Intelligence CY JUN 26-29, 1994 CL ORLANDO, FL SP IEEE, NEURAL NETWORKS COUNCIL, IEEE, ORLANDO SECT C1 NASA,LANGLEY RES CTR,FACIL AUTOMATED CONTROLS,HAMPTON,VA 23665. 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 0-7803-1901-X PY 1994 BP 3232 EP 3237 PG 6 WC Automation & Control Systems; Computer Science, Artificial Intelligence SC Automation & Control Systems; Computer Science GA BC54C UT WOS:A1994BC54C00603 ER PT B AU SCAGLIONE, LJ AF SCAGLIONE, LJ GP IEEE TI NEURAL NETWORK APPLICATION TO PARTICLE IMPACT NOISE DETECTION SO 1994 IEEE INTERNATIONAL CONFERENCE ON NEURAL NETWORKS, VOL 1-7 LA English DT Proceedings Paper CT 1994 IEEE International Conference on Neural Networks (ICNN 94) - 1st IEEE World Congress on Computational Intelligence CY JUN 26-29, 1994 CL ORLANDO, FL SP IEEE, NEURAL NETWORKS COUNCIL, IEEE, ORLANDO SECT C1 NASA,LEWIS RES CTR,CLEVELAND,OH 44135. NR 0 TC 1 Z9 1 U1 2 U2 2 PU I E E E PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 BN 0-7803-1901-X PY 1994 BP 3415 EP 3419 PG 5 WC Automation & Control Systems; Computer Science, Artificial Intelligence SC Automation & Control Systems; Computer Science GA BC54C UT WOS:A1994BC54C00636 ER PT B AU WANG, YF CRUZ, JB MULLIGAN, JH AF WANG, YF CRUZ, JB MULLIGAN, JH GP IEEE TI ADAPTIVE SCHEDULING UTILIZING A NEURAL NETWORK STRUCTURE SO 1994 IEEE INTERNATIONAL CONFERENCE ON NEURAL NETWORKS, VOL 1-7 LA English DT Proceedings Paper CT 1994 IEEE International Conference on Neural Networks (ICNN 94) - 1st IEEE World Congress on Computational Intelligence CY JUN 26-29, 1994 CL ORLANDO, FL SP IEEE, NEURAL NETWORKS COUNCIL, IEEE, ORLANDO SECT C1 JPL,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 0-7803-1901-X PY 1994 BP 3806 EP 3811 PG 6 WC Automation & Control Systems; Computer Science, Artificial Intelligence SC Automation & Control Systems; Computer Science GA BC54C UT WOS:A1994BC54C00706 ER PT B AU BARHEN, J TOOMARIAN, N FIJANY, A AF BARHEN, J TOOMARIAN, N FIJANY, A GP IEEE TI LEARNING WITHOUT LOCAL MINIMA SO 1994 IEEE INTERNATIONAL CONFERENCE ON NEURAL NETWORKS, VOL 1-7 LA English DT Proceedings Paper CT 1994 IEEE International Conference on Neural Networks (ICNN 94) - 1st IEEE World Congress on Computational Intelligence CY JUN 26-29, 1994 CL ORLANDO, FL SP IEEE, NEURAL NETWORKS COUNCIL, IEEE, ORLANDO SECT 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 0-7803-1901-X PY 1994 BP 4592 EP 4596 PG 5 WC Automation & Control Systems; Computer Science, Artificial Intelligence SC Automation & Control Systems; Computer Science GA BC54C UT WOS:A1994BC54C00853 ER PT S AU LEE, SH KIM, SB AF LEE, SH KIM, SB GP IEEE TI KINEMATIC FEATURE ANALYSIS OF PARALLEL MANIPULATOR SYSTEMS SO 1994 IEEE INTERNATIONAL CONFERENCE ON ROBOTICS AND AUTOMATION: PROCEEDINGS, VOLS 1-4 SE IEEE INTERNATIONAL CONFERENCE ON ROBOTICS AND AUTOMATION LA English DT Proceedings Paper CT 1994 IEEE International Conference on Robotics and Automation CY MAY 08-13, 1994 CL SAN DIEGO, CA SP IEEE, ROBOT & AUTOMAT SOC C1 JET PROP LAB,PASADENA,CA 91109. NR 0 TC 7 Z9 7 U1 0 U2 0 PU I E E E, COMPUTER SOC PRESS PI LOS ALAMITOS PA 10662 LOS VAQUEROS CIRCLE, LOS ALAMITOS, CA 90720 SN 1050-4729 BN 0-8186-5330-2 J9 IEEE INT CONF ROBOT PY 1994 BP 77 EP 82 DI 10.1109/ROBOT.1994.351007 PG 6 WC Automation & Control Systems; Engineering, Electrical & Electronic SC Automation & Control Systems; Engineering GA BA72M UT WOS:A1994BA72M00013 ER PT S AU JAIN, A RODRIGUEZ, G AF JAIN, A RODRIGUEZ, G GP IEEE TI DIAGONALIZED DYNAMICS OF ROBOT MANIPULATORS SO 1994 IEEE INTERNATIONAL CONFERENCE ON ROBOTICS AND AUTOMATION: PROCEEDINGS, VOLS 1-4 SE IEEE INTERNATIONAL CONFERENCE ON ROBOTICS AND AUTOMATION LA English DT Proceedings Paper CT 1994 IEEE International Conference on Robotics and Automation CY MAY 08-13, 1994 CL SAN DIEGO, CA SP IEEE, ROBOT & AUTOMAT SOC C1 JET PROP LAB,PASADENA,CA 91109. NR 0 TC 2 Z9 2 U1 0 U2 0 PU I E E E, COMPUTER SOC PRESS PI LOS ALAMITOS PA 10662 LOS VAQUEROS CIRCLE, LOS ALAMITOS, CA 90720 SN 1050-4729 BN 0-8186-5330-2 J9 IEEE INT CONF ROBOT PY 1994 BP 334 EP 339 DI 10.1109/ROBOT.1994.351273 PG 6 WC Automation & Control Systems; Engineering, Electrical & Electronic SC Automation & Control Systems; Engineering GA BA72M UT WOS:A1994BA72M00051 ER PT S AU WILLIAMS, RL AF WILLIAMS, RL GP IEEE TI LOCAL PERFORMANCE OPTIMIZATION FOR A CLASS OF REDUNDANT 8-DEGREE-OF-FREEDOM MANIPULATORS SO 1994 IEEE INTERNATIONAL CONFERENCE ON ROBOTICS AND AUTOMATION: PROCEEDINGS, VOLS 1-4 SE IEEE INTERNATIONAL CONFERENCE ON ROBOTICS AND AUTOMATION LA English DT Proceedings Paper CT 1994 IEEE International Conference on Robotics and Automation CY MAY 08-13, 1994 CL SAN DIEGO, CA SP IEEE, ROBOT & AUTOMAT SOC C1 NASA,LANGLEY RES CTR,HAMPTON,VA 23681. NR 0 TC 1 Z9 1 U1 0 U2 1 PU I E E E, COMPUTER SOC PRESS PI LOS ALAMITOS PA 10662 LOS VAQUEROS CIRCLE, LOS ALAMITOS, CA 90720 SN 1050-4729 BN 0-8186-5330-2 J9 IEEE INT CONF ROBOT PY 1994 BP 992 EP 997 PG 6 WC Automation & Control Systems; Engineering, Electrical & Electronic SC Automation & Control Systems; Engineering GA BA72M UT WOS:A1994BA72M00146 ER PT S AU LIM, D LEE, TS SERAJI, H AF LIM, D LEE, TS SERAJI, H GP IEEE TI A REAL-TIME CONTROL-SYSTEM FOR A MOBILE DEXTEROUS 7 DOF ARM SO 1994 IEEE INTERNATIONAL CONFERENCE ON ROBOTICS AND AUTOMATION: PROCEEDINGS, VOLS 1-4 SE IEEE INTERNATIONAL CONFERENCE ON ROBOTICS AND AUTOMATION LA English DT Proceedings Paper CT 1994 IEEE International Conference on Robotics and Automation CY MAY 08-13, 1994 CL SAN DIEGO, CA SP IEEE, ROBOT & AUTOMAT SOC C1 JET PROP LAB,PASADENA,CA 91109. NR 0 TC 4 Z9 4 U1 0 U2 0 PU I E E E, COMPUTER SOC PRESS PI LOS ALAMITOS PA 10662 LOS VAQUEROS CIRCLE, LOS ALAMITOS, CA 90720 SN 1050-4729 BN 0-8186-5330-2 J9 IEEE INT CONF ROBOT PY 1994 BP 1188 EP 1195 DI 10.1109/ROBOT.1994.351200 PG 8 WC Automation & Control Systems; Engineering, Electrical & Electronic SC Automation & Control Systems; Engineering GA BA72M UT WOS:A1994BA72M00175 ER PT S AU GAT, E DORAIS, G AF GAT, E DORAIS, G GP IEEE TI ROBOT NAVIGATION BY CONDITIONAL SEQUENCING SO 1994 IEEE INTERNATIONAL CONFERENCE ON ROBOTICS AND AUTOMATION: PROCEEDINGS, VOLS 1-4 SE IEEE INTERNATIONAL CONFERENCE ON ROBOTICS AND AUTOMATION LA English DT Proceedings Paper CT 1994 IEEE International Conference on Robotics and Automation CY MAY 08-13, 1994 CL SAN DIEGO, CA SP IEEE, ROBOT & AUTOMAT SOC C1 JET PROP LAB,DEPT MECH ENGN,PASADENA,CA 91109. NR 0 TC 17 Z9 17 U1 0 U2 0 PU I E E E, COMPUTER SOC PRESS PI LOS ALAMITOS PA 10662 LOS VAQUEROS CIRCLE, LOS ALAMITOS, CA 90720 SN 1050-4729 BN 0-8186-5330-2 J9 IEEE INT CONF ROBOT PY 1994 BP 1293 EP 1299 DI 10.1109/ROBOT.1994.351308 PG 7 WC Automation & Control Systems; Engineering, Electrical & Electronic SC Automation & Control Systems; Engineering GA BA72M UT WOS:A1994BA72M00190 ER PT S AU FIJANY, A SHARF, I DELEUTERIO, GMT AF FIJANY, A SHARF, I DELEUTERIO, GMT GP IEEE TI PARALLEL O(LOG-N) ALGORITHMS FOR THE COMPUTATION OF MANIPULATOR FORWARD DYNAMICS SO 1994 IEEE INTERNATIONAL CONFERENCE ON ROBOTICS AND AUTOMATION: PROCEEDINGS, VOLS 1-4 SE IEEE INTERNATIONAL CONFERENCE ON ROBOTICS AND AUTOMATION LA English DT Proceedings Paper CT 1994 IEEE International Conference on Robotics and Automation CY MAY 08-13, 1994 CL SAN DIEGO, CA SP IEEE, ROBOT & AUTOMAT SOC C1 JET PROP LAB,PASADENA,CA 91109. NR 0 TC 1 Z9 1 U1 0 U2 0 PU I E E E, COMPUTER SOC PRESS PI LOS ALAMITOS PA 10662 LOS VAQUEROS CIRCLE, LOS ALAMITOS, CA 90720 SN 1050-4729 BN 0-8186-5330-2 J9 IEEE INT CONF ROBOT PY 1994 BP 1547 EP 1553 DI 10.1109/ROBOT.1994.351368 PG 7 WC Automation & Control Systems; Engineering, Electrical & Electronic SC Automation & Control Systems; Engineering GA BA72M UT WOS:A1994BA72M00228 ER PT S AU FIJANY, A AF FIJANY, A GP IEEE TI SCHUR COMPLEMENT FACTORIZATIONS AND PARALLEL O(LOG-N) ALGORITHMS FOR COMPUTATION OF OPERATIONAL SPACE MASS MATRIX AND ITS INVERSE SO 1994 IEEE INTERNATIONAL CONFERENCE ON ROBOTICS AND AUTOMATION: PROCEEDINGS, VOLS 1-4 SE IEEE INTERNATIONAL CONFERENCE ON ROBOTICS AND AUTOMATION LA English DT Proceedings Paper CT 1994 IEEE International Conference on Robotics and Automation CY MAY 08-13, 1994 CL SAN DIEGO, CA SP IEEE, ROBOT & AUTOMAT SOC C1 JET PROP LAB,PASADENA,CA 91109. NR 0 TC 3 Z9 3 U1 0 U2 0 PU I E E E, COMPUTER SOC PRESS PI LOS ALAMITOS PA 10662 LOS VAQUEROS CIRCLE, LOS ALAMITOS, CA 90720 SN 1050-4729 BN 0-8186-5330-2 J9 IEEE INT CONF ROBOT PY 1994 BP 2369 EP 2376 DI 10.1109/ROBOT.1994.350932 PG 8 WC Automation & Control Systems; Engineering, Electrical & Electronic SC Automation & Control Systems; Engineering GA BA72M UT WOS:A1994BA72M00351 ER PT S AU SERAJI, H AF SERAJI, H GP IEEE TI ADAPTIVE ADMITTANCE CONTROL - AN APPROACH TO EXPLICIT FORCE CONTROL IN COMPLIANT MOTION SO 1994 IEEE INTERNATIONAL CONFERENCE ON ROBOTICS AND AUTOMATION: PROCEEDINGS, VOLS 1-4 SE IEEE INTERNATIONAL CONFERENCE ON ROBOTICS AND AUTOMATION LA English DT Proceedings Paper CT 1994 IEEE International Conference on Robotics and Automation CY MAY 08-13, 1994 CL SAN DIEGO, CA SP IEEE, ROBOT & AUTOMAT SOC C1 JET PROP LAB,PASADENA,CA 91109. NR 0 TC 54 Z9 55 U1 0 U2 0 PU I E E E, COMPUTER SOC PRESS PI LOS ALAMITOS PA 10662 LOS VAQUEROS CIRCLE, LOS ALAMITOS, CA 90720 SN 1050-4729 BN 0-8186-5330-2 J9 IEEE INT CONF ROBOT PY 1994 BP 2705 EP 2712 DI 10.1109/ROBOT.1994.350927 PG 8 WC Automation & Control Systems; Engineering, Electrical & Electronic SC Automation & Control Systems; Engineering GA BA72M UT WOS:A1994BA72M00401 ER PT S AU KIM, WS AF KIM, WS GP IEEE TI VIRTUAL-REALITY CALIBRATION FOR TELEROBOTIC SERVICING SO 1994 IEEE INTERNATIONAL CONFERENCE ON ROBOTICS AND AUTOMATION: PROCEEDINGS, VOLS 1-4 SE IEEE INTERNATIONAL CONFERENCE ON ROBOTICS AND AUTOMATION LA English DT Proceedings Paper CT 1994 IEEE International Conference on Robotics and Automation CY MAY 08-13, 1994 CL SAN DIEGO, CA SP IEEE, ROBOT & AUTOMAT SOC C1 JET PROP LAB,PASADENA,CA 91109. NR 0 TC 4 Z9 6 U1 0 U2 0 PU I E E E, COMPUTER SOC PRESS PI LOS ALAMITOS PA 10662 LOS VAQUEROS CIRCLE, LOS ALAMITOS, CA 90720 SN 1050-4729 BN 0-8186-5330-2 J9 IEEE INT CONF ROBOT PY 1994 BP 2769 EP 2775 DI 10.1109/ROBOT.1994.350918 PG 7 WC Automation & Control Systems; Engineering, Electrical & Electronic SC Automation & Control Systems; Engineering GA BA72M UT WOS:A1994BA72M00410 ER PT S AU LEE, SH LEE, HS AF LEE, SH LEE, HS GP IEEE TI DESIGN OF OPTIMAL TIME-DELAYED TELEOPERATOR CONTROL-SYSTEM SO 1994 IEEE INTERNATIONAL CONFERENCE ON ROBOTICS AND AUTOMATION: PROCEEDINGS, VOLS 1-4 SE IEEE INTERNATIONAL CONFERENCE ON ROBOTICS AND AUTOMATION LA English DT Proceedings Paper CT 1994 IEEE International Conference on Robotics and Automation CY MAY 08-13, 1994 CL SAN DIEGO, CA SP IEEE, ROBOT & AUTOMAT SOC C1 JET PROP LAB,PASADENA,CA 91109. NR 0 TC 1 Z9 1 U1 0 U2 0 PU I E E E, COMPUTER SOC PRESS PI LOS ALAMITOS PA 10662 LOS VAQUEROS CIRCLE, LOS ALAMITOS, CA 90720 SN 1050-4729 BN 0-8186-5330-2 J9 IEEE INT CONF ROBOT PY 1994 BP 3252 EP 3258 DI 10.1109/ROBOT.1994.351070 PG 7 WC Automation & Control Systems; Engineering, Electrical & Electronic SC Automation & Control Systems; Engineering GA BA72M UT WOS:A1994BA72M00483 ER PT S AU VOLPE, R IVLEV, R AF VOLPE, R IVLEV, R GP IEEE TI A SURVEY AND EXPERIMENTAL EVALUATION OF PROXIMITY SENSORS FOR SPACE ROBOTICS SO 1994 IEEE INTERNATIONAL CONFERENCE ON ROBOTICS AND AUTOMATION: PROCEEDINGS, VOLS 1-4 SE IEEE INTERNATIONAL CONFERENCE ON ROBOTICS AND AUTOMATION LA English DT Proceedings Paper CT 1994 IEEE International Conference on Robotics and Automation CY MAY 08-13, 1994 CL SAN DIEGO, CA SP IEEE, ROBOT & AUTOMAT SOC C1 JET PROP LAB,PASADENA,CA 91109. NR 0 TC 7 Z9 7 U1 0 U2 0 PU I E E E, COMPUTER SOC PRESS PI LOS ALAMITOS PA 10662 LOS VAQUEROS CIRCLE, LOS ALAMITOS, CA 90720 SN 1050-4729 BN 0-8186-5330-2 J9 IEEE INT CONF ROBOT PY 1994 BP 3466 EP 3473 DI 10.1109/ROBOT.1994.351037 PG 8 WC Automation & Control Systems; Engineering, Electrical & Electronic SC Automation & Control Systems; Engineering GA BA72M UT WOS:A1994BA72M00516 ER PT S AU VOLPE, R MCAFFEE, D AF VOLPE, R MCAFFEE, D GP IEEE TI A ROBOTIC LIGHTING SYSTEM FOR SOLAR ILLUMINATION SIMULATION SO 1994 IEEE INTERNATIONAL CONFERENCE ON ROBOTICS AND AUTOMATION: PROCEEDINGS, VOLS 1-4 SE IEEE INTERNATIONAL CONFERENCE ON ROBOTICS AND AUTOMATION LA English DT Proceedings Paper CT 1994 IEEE International Conference on Robotics and Automation CY MAY 08-13, 1994 CL SAN DIEGO, CA SP IEEE, ROBOT & AUTOMAT 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 SN 1050-4729 BN 0-8186-5330-2 J9 IEEE INT CONF ROBOT PY 1994 BP 3474 EP 3479 DI 10.1109/ROBOT.1994.351036 PG 6 WC Automation & Control Systems; Engineering, Electrical & Electronic SC Automation & Control Systems; Engineering GA BA72M UT WOS:A1994BA72M00517 ER PT B AU CHENG, LJ LI, GP ZANG, DY AF CHENG, LJ LI, GP ZANG, DY BE Maszara, W TI SOI CHARACTERIZATION USING AOTF POLARIMETRIC HYPERSPECTRAL IMAGING SO 1994 IEEE INTERNATIONAL SOI CONFERENCE, PROCEEDINGS LA English DT Proceedings Paper CT 1994 IEEE International SOI Conference CY OCT 03-06, 1994 CL NANTUCKET ISLAND, MA SP IEEE Electron Devices Soc C1 CALTECH, JET PROP LAB, PASADENA, CA 91109 USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU IEEE PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 USA BN 0-7803-2407-2 PY 1994 BP 91 EP 92 PG 2 WC Engineering, Electrical & Electronic; Physics, Condensed Matter SC Engineering; Physics GA BD41Z UT WOS:A1990BD41Z00045 ER PT B AU BISHOP, DF AF BISHOP, DF GP IEEE TI SIMULATION OF INTERFERENCE BETWEEN EARTH STATIONS AND EARTH-ORBITING SATELLITES SO 1994 IEEE INTERNATIONAL SYMPOSIUM ON ELECTROMAGNETIC COMPATIBILITY - COMPATIBILITY IN THE LOOP LA English DT Proceedings Paper CT 1994 IEEE International Symposium on Electromagnetic Compatibility CY AUG 22-26, 1994 CL CHICAGO, IL SP IEEE, EMC 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 BN 0-7803-1398-4 PY 1994 BP 360 EP 365 PG 6 WC Engineering, Electrical & Electronic SC Engineering GA BB67L UT WOS:A1994BB67L00072 ER PT B AU DIVSALAR, D SIMON, MK AF DIVSALAR, D SIMON, MK GP IEEE TI IMPROVED CDMA PERFORMANCE USING PARALLEL INTERFERENCE CANCELLATION SO 1994 IEEE MILCOM CONFERENCE RECORD, VOLS 1-3 LA English DT Proceedings Paper CT IEEE Communications-Society 13th Military Communications Conference (MILCOM 94)/19th Annual Fort Monmouth Chapter AFCEA Symposium CY OCT 02-05, 1994 CL FT MONMOUTH, NJ SP IEEE, COMMUN SOC, ARMED FORCES COMMUN & ELECTR ASSOC 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 PY 1994 BP 911 EP 917 PG 7 WC Telecommunications SC Telecommunications GA BC58K UT WOS:A1994BC58K00186 ER PT S AU DRAYTON, RF KATEHI, LPB AF DRAYTON, RF KATEHI, LPB BE Kuno, HJ Wen, CP TI DEVELOPMENT OF MINIATURE MICROWAVE CIRCUIT COMPONENTS USING MICROMACHINING TECHNIQUES SO 1994 IEEE MTT-S INTERNATIONAL MICROWAVE SYMPOSIUM DIGEST, VOLS 1-3 SE IEEE MTT-S INTERNATIONAL MICROWAVE SYMPOSIUM DIGEST LA English DT Proceedings Paper CT 1994 IEEE MTT-S International Microwave Symposium CY MAY 23-27, 1994 CL SAN DIEGO, CA SP IEEE, MTT CHAPTER C1 UNIV MICHIGAN,NASA,CTR SPACE TERAHERTZ TECHNOL,ANN ARBOR,MI 48109. RI Franklin, Rhonda/C-8037-2011 NR 0 TC 3 Z9 3 U1 0 U2 0 PU I E E E PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 SN 0149-645X BN 0-7803-1778-5 J9 IEEE MTT-S PY 1994 BP 225 EP 228 DI 10.1109/MWSYM.1994.335331 PG 4 WC Engineering, Electrical & Electronic; Optics; Telecommunications SC Engineering; Optics; Telecommunications GA BB20R UT WOS:A1994BB20R00051 ER PT S AU OSWALD, JE SIEGEL, PH AF OSWALD, JE SIEGEL, PH BE Kuno, HJ Wen, CP TI THE APPLICATION OF THE FDTD METHOD TO MILLIMETER-WAVE FILTER CIRCUITS INCLUDING THE DESIGN AND ANALYSIS OF A COMPACT COPLANAR STRIP FILTER FOR THZ FREQUENCIES SO 1994 IEEE MTT-S INTERNATIONAL MICROWAVE SYMPOSIUM DIGEST, VOLS 1-3 SE IEEE MTT-S INTERNATIONAL MICROWAVE SYMPOSIUM DIGEST LA English DT Proceedings Paper CT 1994 IEEE MTT-S International Microwave Symposium CY MAY 23-27, 1994 CL SAN DIEGO, CA SP IEEE, MTT CHAPTER 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 0149-645X BN 0-7803-1778-5 J9 IEEE MTT-S PY 1994 BP 309 EP 312 DI 10.1109/MWSYM.1994.335251 PG 4 WC Engineering, Electrical & Electronic; Optics; Telecommunications SC Engineering; Optics; Telecommunications GA BB20R UT WOS:A1994BB20R00072 ER PT S AU ROBERTSON, SV KATEHI, LPB REBEIZ, GM AF ROBERTSON, SV KATEHI, LPB REBEIZ, GM BE Kuno, HJ Wen, CP TI W-BAND MICROSHIELD LOW-PASS FILTERS SO 1994 IEEE MTT-S INTERNATIONAL MICROWAVE SYMPOSIUM DIGEST, VOLS 1-3 SE IEEE MTT-S INTERNATIONAL MICROWAVE SYMPOSIUM DIGEST LA English DT Proceedings Paper CT 1994 IEEE MTT-S International Microwave Symposium CY MAY 23-27, 1994 CL SAN DIEGO, CA SP IEEE, MTT CHAPTER C1 UNIV MICHIGAN,NASA,CTR SPACE TERAHERTZ TECHNOL,ANN ARBOR,MI 48109. NR 0 TC 4 Z9 4 U1 0 U2 0 PU I E E E PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 SN 0149-645X BN 0-7803-1778-5 J9 IEEE MTT-S PY 1994 BP 625 EP 628 DI 10.1109/MWSYM.1994.335500 PG 4 WC Engineering, Electrical & Electronic; Optics; Telecommunications SC Engineering; Optics; Telecommunications GA BB20R UT WOS:A1994BB20R00145 ER PT S AU CHI, CY REBEIZ, GM AF CHI, CY REBEIZ, GM BE Kuno, HJ Wen, CP TI PLANAR MILLIMETER-WAVE MICROSTRIP LUMPED ELEMENTS USING MICROMACHINING TECHNIQUES SO 1994 IEEE MTT-S INTERNATIONAL MICROWAVE SYMPOSIUM DIGEST, VOLS 1-3 SE IEEE MTT-S INTERNATIONAL MICROWAVE SYMPOSIUM DIGEST LA English DT Proceedings Paper CT 1994 IEEE MTT-S International Microwave Symposium CY MAY 23-27, 1994 CL SAN DIEGO, CA SP IEEE, MTT CHAPTER C1 UNIV MICHIGAN,DEPT ELECT ENGN & COMP SCI,NASA,CTR SPACE TERAHERTZ TECHNOL,ANN ARBOR,MI 48109. NR 0 TC 9 Z9 10 U1 0 U2 0 PU I E E E PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 SN 0149-645X BN 0-7803-1778-5 J9 IEEE MTT-S PY 1994 BP 657 EP 660 DI 10.1109/MWSYM.1994.335509 PG 4 WC Engineering, Electrical & Electronic; Optics; Telecommunications SC Engineering; Optics; Telecommunications GA BB20R UT WOS:A1994BB20R00152 ER PT S AU CHOUDHURY, D RAISANEN, AV SMITH, RP MARTIN, SC OSWALD, JE DENGLER, RJ FRERKING, MA SIEGEL, PH AF CHOUDHURY, D RAISANEN, AV SMITH, RP MARTIN, SC OSWALD, JE DENGLER, RJ FRERKING, MA SIEGEL, PH BE Kuno, HJ Wen, CP TI FREQUENCY TRIPLER WITH INTEGRATED BACK-TO-BACK BARRIER-N-N+ (BBBNN) VARACTOR DIODES IN A NOVEL SPLIT-WAVE-GUIDE BLOCK AT 220 GHZ SO 1994 IEEE MTT-S INTERNATIONAL MICROWAVE SYMPOSIUM DIGEST, VOLS 1-3 SE IEEE MTT-S INTERNATIONAL MICROWAVE SYMPOSIUM DIGEST LA English DT Proceedings Paper CT 1994 IEEE MTT-S International Microwave Symposium CY MAY 23-27, 1994 CL SAN DIEGO, CA SP IEEE, MTT CHAPTER C1 JET PROP LAB,PASADENA,CA 91109. RI Raisanen, Antti/G-2405-2013 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 0149-645X BN 0-7803-1778-5 J9 IEEE MTT-S PY 1994 BP 771 EP 774 DI 10.1109/MWSYM.1994.335242 PG 4 WC Engineering, Electrical & Electronic; Optics; Telecommunications SC Engineering; Optics; Telecommunications GA BB20R UT WOS:A1994BB20R00178 ER PT S AU MEHDI, I MAZED, M DENGLER, R PEASE, A NATZIC, M SIEGEL, PH AF MEHDI, I MAZED, M DENGLER, R PEASE, A NATZIC, M SIEGEL, PH BE Kuno, HJ Wen, CP TI PLANAR GAAS SCHOTTKY DIODES INTEGRATED WITH QUARTZ SUBSTRATE CIRCUITRY FOR WAVE-GUIDE SUBHARMONIC MIXERS AT 215 GHZ SO 1994 IEEE MTT-S INTERNATIONAL MICROWAVE SYMPOSIUM DIGEST, VOLS 1-3 SE IEEE MTT-S INTERNATIONAL MICROWAVE SYMPOSIUM DIGEST LA English DT Proceedings Paper CT 1994 IEEE MTT-S International Microwave Symposium CY MAY 23-27, 1994 CL SAN DIEGO, CA SP IEEE, MTT CHAPTER C1 JET PROP LAB,PASADENA,CA 91109. NR 0 TC 8 Z9 8 U1 0 U2 0 PU I E E E PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 SN 0149-645X BN 0-7803-1778-5 J9 IEEE MTT-S PY 1994 BP 779 EP 782 DI 10.1109/MWSYM.1994.335240 PG 4 WC Engineering, Electrical & Electronic; Optics; Telecommunications SC Engineering; Optics; Telecommunications GA BB20R UT WOS:A1994BB20R00180 ER PT S AU LEE, TH CHI, CY EAST, JR REBEIZ, GM HADDAD, GI AF LEE, TH CHI, CY EAST, JR REBEIZ, GM HADDAD, GI BE Kuno, HJ Wen, CP TI A QUASI-OPTICAL SUBHARMONICALLY-PUMPED RECEIVER USING SEPARATELY BIASED SCHOTTKY DIODE PAIRS SO 1994 IEEE MTT-S INTERNATIONAL MICROWAVE SYMPOSIUM DIGEST, VOLS 1-3 SE IEEE MTT-S INTERNATIONAL MICROWAVE SYMPOSIUM DIGEST LA English DT Proceedings Paper CT 1994 IEEE MTT-S International Microwave Symposium CY MAY 23-27, 1994 CL SAN DIEGO, CA SP IEEE, MTT CHAPTER C1 UNIV MICHIGAN,NASA,CTR SPACE TERAHERTZ TECHNOL,ANN ARBOR,MI 48109. 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 0149-645X BN 0-7803-1778-5 J9 IEEE MTT-S PY 1994 BP 783 EP 786 DI 10.1109/MWSYM.1994.335239 PG 4 WC Engineering, Electrical & Electronic; Optics; Telecommunications SC Engineering; Optics; Telecommunications GA BB20R UT WOS:A1994BB20R00181 ER PT S AU KORMANYOS, BK ROSENBAUM, SE KATEHI, LP REBEIZ, GM AF KORMANYOS, BK ROSENBAUM, SE KATEHI, LP REBEIZ, GM BE Kuno, HJ Wen, CP TI MONOLITHIC 155 GHZ AND 215 GHZ QUASI-OPTICAL SLOT OSCILLATORS SO 1994 IEEE MTT-S INTERNATIONAL MICROWAVE SYMPOSIUM DIGEST, VOLS 1-3 SE IEEE MTT-S INTERNATIONAL MICROWAVE SYMPOSIUM DIGEST LA English DT Proceedings Paper CT 1994 IEEE MTT-S International Microwave Symposium CY MAY 23-27, 1994 CL SAN DIEGO, CA SP IEEE, MTT CHAPTER C1 UNIV MICHIGAN,DEPT ELECT ENGN & COMP SCI,NASA,CTR SPACE TERAHERTZ TECHNOL,ANN ARBOR,MI 48109. 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 0149-645X BN 0-7803-1778-5 J9 IEEE MTT-S PY 1994 BP 835 EP 838 DI 10.1109/MWSYM.1994.335227 PG 4 WC Engineering, Electrical & Electronic; Optics; Telecommunications SC Engineering; Optics; Telecommunications GA BB20R UT WOS:A1994BB20R00193 ER PT S AU ANTSOS, D CRIST, R SUKAMTO, L AF ANTSOS, D CRIST, R SUKAMTO, L BE Kuno, HJ Wen, CP TI A NOVEL WILKINSON POWER DIVIDER WITH PREDICTABLE PERFORMANCE AT K AND KA-BAND SO 1994 IEEE MTT-S INTERNATIONAL MICROWAVE SYMPOSIUM DIGEST, VOLS 1-3 SE IEEE MTT-S INTERNATIONAL MICROWAVE SYMPOSIUM DIGEST LA English DT Proceedings Paper CT 1994 IEEE MTT-S International Microwave Symposium CY MAY 23-27, 1994 CL SAN DIEGO, CA SP IEEE, MTT CHAPTER C1 JET PROP LAB,PASADENA,CA 91109. NR 0 TC 19 Z9 20 U1 0 U2 0 PU I E E E PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 SN 0149-645X BN 0-7803-1778-5 J9 IEEE MTT-S PY 1994 BP 907 EP 910 DI 10.1109/MWSYM.1994.335210 PG 4 WC Engineering, Electrical & Electronic; Optics; Telecommunications SC Engineering; Optics; Telecommunications GA BB20R UT WOS:A1994BB20R00210 ER PT S AU WELLER, TM KATEHI, LP HERMAN, MI WAMHOF, PD AF WELLER, TM KATEHI, LP HERMAN, MI WAMHOF, PD BE Kuno, HJ Wen, CP TI MEMBRANE TECHNOLOGY (MIST-T) APPLIED TO MICROSTRIP - A 33 GHZ WILKINSON POWER DIVIDER SO 1994 IEEE MTT-S INTERNATIONAL MICROWAVE SYMPOSIUM DIGEST, VOLS 1-3 SE IEEE MTT-S INTERNATIONAL MICROWAVE SYMPOSIUM DIGEST LA English DT Proceedings Paper CT 1994 IEEE MTT-S International Microwave Symposium CY MAY 23-27, 1994 CL SAN DIEGO, CA SP IEEE, MTT CHAPTER C1 UNIV MICHIGAN,NASA,CTR SPACE TERAHERTZ TECHNOL,ANN ARBOR,MI 48109. 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 0149-645X BN 0-7803-1778-5 J9 IEEE MTT-S PY 1994 BP 911 EP 914 DI 10.1109/MWSYM.1994.335209 PG 4 WC Engineering, Electrical & Electronic; Optics; Telecommunications SC Engineering; Optics; Telecommunications GA BB20R UT WOS:A1994BB20R00211 ER PT S AU TAUB, SR YOUNG, P AF TAUB, SR YOUNG, P BE Kuno, HJ Wen, CP TI TEMPERATURE-DEPENDENT PERFORMANCE OF COPLANAR WAVE-GUIDE (CPW) ON SUBSTRATES OF VARIOUS MATERIALS SO 1994 IEEE MTT-S INTERNATIONAL MICROWAVE SYMPOSIUM DIGEST, VOLS 1-3 SE IEEE MTT-S INTERNATIONAL MICROWAVE SYMPOSIUM DIGEST LA English DT Proceedings Paper CT 1994 IEEE MTT-S International Microwave Symposium CY MAY 23-27, 1994 CL SAN DIEGO, CA SP IEEE, MTT CHAPTER C1 NASA,LEWIS RES CTR,CLEVELAND,OH 44135. NR 0 TC 3 Z9 3 U1 0 U2 0 PU I E E E PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 SN 0149-645X BN 0-7803-1778-5 J9 IEEE MTT-S PY 1994 BP 1049 EP 1051 DI 10.1109/MWSYM.1994.335175 PG 3 WC Engineering, Electrical & Electronic; Optics; Telecommunications SC Engineering; Optics; Telecommunications GA BB20R UT WOS:A1994BB20R00245 ER PT S AU GEARHART, SS REBEIZ, GM AF GEARHART, SS REBEIZ, GM BE Kuno, HJ Wen, CP TI A MONOLITHIC 250 GHZ SCHOTTKY-DIODE RECEIVER SO 1994 IEEE MTT-S INTERNATIONAL MICROWAVE SYMPOSIUM DIGEST, VOLS 1-3 SE IEEE MTT-S INTERNATIONAL MICROWAVE SYMPOSIUM DIGEST LA English DT Proceedings Paper CT 1994 IEEE MTT-S International Microwave Symposium CY MAY 23-27, 1994 CL SAN DIEGO, CA SP IEEE, MTT CHAPTER C1 UNIV MICHIGAN,DEPT ELECT ENGN & COMP SCI,NASA,CTR SPACE TERAHERTZ TECHNOL,ANN ARBOR,MI 48109. NR 0 TC 0 Z9 0 U1 0 U2 2 PU I E E E PI NEW YORK PA 345 E 47TH ST, NEW YORK, NY 10017 SN 0149-645X BN 0-7803-1778-5 J9 IEEE MTT-S PY 1994 BP 1333 EP 1336 DI 10.1109/MWSYM.1994.335130 PG 4 WC Engineering, Electrical & Electronic; Optics; Telecommunications SC Engineering; Optics; Telecommunications GA BB20R UT WOS:A1994BB20R00311 ER PT S AU STIMSON, PA DENGLER, RJ LEDUC, HG SIEGEL, PH AF STIMSON, PA DENGLER, RJ LEDUC, HG SIEGEL, PH BE Kuno, HJ Wen, CP TI A PROTOTYPE QUASI-OPTICAL SIS ARRAY RECEIVER SO 1994 IEEE MTT-S INTERNATIONAL MICROWAVE SYMPOSIUM DIGEST, VOLS 1-3 SE IEEE MTT-S INTERNATIONAL MICROWAVE SYMPOSIUM DIGEST LA English DT Proceedings Paper CT 1994 IEEE MTT-S International Microwave Symposium CY MAY 23-27, 1994 CL SAN DIEGO, CA SP IEEE, MTT CHAPTER 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 0149-645X BN 0-7803-1778-5 J9 IEEE MTT-S PY 1994 BP 1337 EP 1339 DI 10.1109/MWSYM.1994.335320 PG 3 WC Engineering, Electrical & Electronic; Optics; Telecommunications SC Engineering; Optics; Telecommunications GA BB20R UT WOS:A1994BB20R00312 ER PT S AU MOLLENKOPF, S REBEIZ, GM AF MOLLENKOPF, S REBEIZ, GM BE Kuno, HJ Wen, CP TI A 22 GHZ MIC ACTIVE RECEIVER RADIOMETER SO 1994 IEEE MTT-S INTERNATIONAL MICROWAVE SYMPOSIUM DIGEST, VOLS 1-3 SE IEEE MTT-S INTERNATIONAL MICROWAVE SYMPOSIUM DIGEST LA English DT Proceedings Paper CT 1994 IEEE MTT-S International Microwave Symposium CY MAY 23-27, 1994 CL SAN DIEGO, CA SP IEEE, MTT CHAPTER C1 UNIV MICHIGAN,DEPT ELECT ENGN & COMP SCI,NASA,CTR SPACE TERAHERTZ TECHNOL,ANN ARBOR,MI 48109. 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 SN 0149-645X BN 0-7803-1778-5 J9 IEEE MTT-S PY 1994 BP 1347 EP 1350 DI 10.1109/MWSYM.1994.335300 PG 4 WC Engineering, Electrical & Electronic; Optics; Telecommunications SC Engineering; Optics; Telecommunications GA BB20R UT WOS:A1994BB20R00315 ER PT S AU FILIPOVIC, DF BRADLEY, RF REBEIZ, GM AF FILIPOVIC, DF BRADLEY, RF REBEIZ, GM BE Kuno, HJ Wen, CP TI A PLANAR BROAD-BAND MIC BALANCED VARACTOR DOUBLER USING A NOVEL GROUNDED-CPW TO SLOTLINE TRANSITION SO 1994 IEEE MTT-S INTERNATIONAL MICROWAVE SYMPOSIUM DIGEST, VOLS 1-3 SE IEEE MTT-S INTERNATIONAL MICROWAVE SYMPOSIUM DIGEST LA English DT Proceedings Paper CT 1994 IEEE MTT-S International Microwave Symposium CY MAY 23-27, 1994 CL SAN DIEGO, CA SP IEEE, MTT CHAPTER C1 UNIV MICHIGAN,DEPT ELECT ENGN & COMP SCI,NASA,CTR SPACE TERAHERTZ TECHNOL,ANN ARBOR,MI 48109. 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 0149-645X BN 0-7803-1778-5 J9 IEEE MTT-S PY 1994 BP 1633 EP 1636 DI 10.1109/MWSYM.1994.335128 PG 4 WC Engineering, Electrical & Electronic; Optics; Telecommunications SC Engineering; Optics; Telecommunications GA BB20R UT WOS:A1994BB20R00379 ER PT B AU LICHTEN, SM HAINES, BJ YOUNG, LE SRINIVASAN, J SWEENEY, D SPITZMESSER, D STEPHENS, S DUNN, C AF LICHTEN, SM HAINES, BJ YOUNG, LE SRINIVASAN, J SWEENEY, D SPITZMESSER, D STEPHENS, S DUNN, C BE Hoffman, MI TI USING THE GLOBAL POSITIONING SYSTEM FOR EARTH ORBITER AND DEEP SPACE TRACKING SO 1994 IEEE NATIONAL TELESYSTEMS CONFERENCE - CONFERENCE PROCEEDINGS LA English DT Proceedings Paper CT 1994 IEEE National Telesystems Conference/1994 International Microwave Symposium CY MAY 26-28, 1994 CL SAN DIEGO, CA SP IEEE, AEROSP & ELECTR SYST SOC, IEEE, MICROWAVE THEORY & TECH SOC, IEEE, SAN DIEGO SECT, IEEE, NATL CAPITAL AREA COUNCIL, IEEE, ATLANTA SECT 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 0-7803-1869-2 PY 1994 BP 103 EP 106 PG 4 WC Engineering, Aerospace; Engineering, Electrical & Electronic; Telecommunications SC Engineering; Telecommunications GA BA73D UT WOS:A1994BA73D00024 ER PT B AU AGAN, M DENSMORE, A AF AGAN, M DENSMORE, A BE Hoffman, MI TI NASA K/KA-BAND BROAD-BAND AERONAUTICAL TERMINAL FOR DUPLEX SATELLITE VIDEO COMMUNICATIONS SO 1994 IEEE NATIONAL TELESYSTEMS CONFERENCE - CONFERENCE PROCEEDINGS LA English DT Proceedings Paper CT 1994 IEEE National Telesystems Conference/1994 International Microwave Symposium CY MAY 26-28, 1994 CL SAN DIEGO, CA SP IEEE, AEROSP & ELECTR SYST SOC, IEEE, MICROWAVE THEORY & TECH SOC, IEEE, SAN DIEGO SECT, IEEE, NATL CAPITAL AREA COUNCIL, IEEE, ATLANTA SECT 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 0-7803-1869-2 PY 1994 BP 165 EP 168 PG 4 WC Engineering, Aerospace; Engineering, Electrical & Electronic; Telecommunications SC Engineering; Telecommunications GA BA73D UT WOS:A1994BA73D00039 ER PT B AU OTOSHI, TY AF OTOSHI, TY BE Hoffman, MI TI A METHOD FOR MODELING DISCONTINUITIES IN A MICROWAVE COAXIAL TRANSMISSION-LINE SO 1994 IEEE NATIONAL TELESYSTEMS CONFERENCE - CONFERENCE PROCEEDINGS LA English DT Proceedings Paper CT 1994 IEEE National Telesystems Conference/1994 International Microwave Symposium CY MAY 26-28, 1994 CL SAN DIEGO, CA SP IEEE, AEROSP & ELECTR SYST SOC, IEEE, MICROWAVE THEORY & TECH SOC, IEEE, SAN DIEGO SECT, IEEE, NATL CAPITAL AREA COUNCIL, IEEE, ATLANTA SECT 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 0-7803-1869-2 PY 1994 BP 253 EP 256 PG 4 WC Engineering, Aerospace; Engineering, Electrical & Electronic; Telecommunications SC Engineering; Telecommunications GA BA73D UT WOS:A1994BA73D00056 ER PT B AU HE, QB LIU, HK YEH, P DELACRUZ, SC FEINBERG, J AF HE, QB LIU, HK YEH, P DELACRUZ, SC FEINBERG, J GP IEEE TI MUTUALLY-PUMPED PHASE CONJUGATION IN PHOTOREFRACTIVE CRYSTALS WITH PARTIALLY COHERENT BEAMS SO 1994 IEEE NONLINEAR OPTICS: MATERIALS, FUNDAMENTALS, AND APPLICATIONS LA English DT Proceedings Paper CT 1994 IEEE Conference on Nonlinear Optics - Materials, Fundamentals, and Applications CY JUL 25-29, 1994 CL WAIKOLOA, HI SP IEEE, LASERS & ELECTRO OPT SOC, OPT SOC AMER 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 0-7803-1473-5 PY 1994 BP 96 EP 98 PG 3 WC Optics SC Optics GA BC30X UT WOS:A1994BC30X00033 ER PT B AU MILLER, RA BRINDLEY, WJ GOEDJEN, JG TIWARI, R MESS, D AF MILLER, RA BRINDLEY, WJ GOEDJEN, JG TIWARI, R MESS, D BE Berndt, CC Sampath, S TI THE EFFECT OF SILICA ON THE CYCLIC LIFE OF A ZIRCONIA-YTTRIA THERMAL BARRIER COATING SO 1994 THERMAL SPRAY INDUSTRIAL APPLICATIONS LA English DT Proceedings Paper CT 7th National Thermal Spray Conference - Thermal Spray Industrial Applications CY JUN 20-24, 1994 CL BOSTON, MA SP ASM INT, THERMAL SPRAY DIV, AMER WELDING SOC, DEUT VERBAND SCHWEISSTECH E V, HIGH TEMP SOC JAPAN, INT THERMAL SPRAY ASSOC, JAPANESE THERMAL SPRAY SOC C1 NASA,LEWIS RES CTR,CLEVELAND,OH 44135. NR 0 TC 0 Z9 0 U1 0 U2 0 PU ASM INTERNATIONAL PI MATERIALS PARK PA 9503 KINSMAN RD, MATERIALS PARK, OH 44073 BN 0-87170-509-5 PY 1994 BP 49 EP 54 PG 6 WC Engineering, Mechanical; Materials Science, Ceramics; Metallurgy & Metallurgical Engineering; Materials Science, Coatings & Films; Physics, Fluids & Plasmas SC Engineering; Materials Science; Metallurgy & Metallurgical Engineering; Physics GA BC87N UT WOS:A1994BC87N00008 ER PT B AU HENRY, H AF HENRY, H BE Tew, JD Manivannan, MS Sadowski, DA Seila, AF TI THE CORPS BATTLE SIMULATION - REMODELING THE MODEL FOR NEW MISSIONS SO 1994 WINTER SIMULATION CONFERENCE PROCEEDINGS LA English DT Proceedings Paper CT 1994 Winter Simulation Conference CY DEC 11-14, 1994 CL LAKE BUENA VISTA, FL 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 PROPULS 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 0-7803-2109-X PY 1994 BP 788 EP 791 PG 4 WC Computer Science, Software Engineering SC Computer Science GA BC51T UT WOS:A1994BC51T00115 ER PT B AU DICKENS, PM HEIDELBERGER, P NICOL, DM AF DICKENS, PM HEIDELBERGER, P NICOL, DM BE Tew, JD Manivannan, MS Sadowski, DA Seila, AF TI TIMING SIMULATION OF PARAGON CODES USING WORKSTATION CLUSTERS SO 1994 WINTER SIMULATION CONFERENCE PROCEEDINGS LA English DT Proceedings Paper CT 1994 Winter Simulation Conference CY DEC 11-14, 1994 CL LAKE BUENA VISTA, FL 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,HAMPTON,VA 23665. 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 0-7803-2109-X PY 1994 BP 1347 EP 1353 PG 7 WC Computer Science, Software Engineering SC Computer Science GA BC51T UT WOS:A1994BC51T00195 ER PT B AU EVANS, J CUSHING, MJ LALL, P BAUERNSCHUB, R AF EVANS, J CUSHING, MJ LALL, P BAUERNSCHUB, R GP IEEE TI A PHYSICS-OF-FAILURE (POF) APPROACH TO ADDRESSING DEVICE RELIABILITY IN ACCELERATED TESTING OF MCMS SO 1995 IEEE MULTI-CHIP MODULE CONFERENCE, PROCEEDINGS LA English DT Proceedings Paper CT 1995 IEEE Multi-Chip Module Conference CY JAN 31-FEB 02, 1995 CL SANTA CRUZ, CA SP IEEE, CIRCUITS & SYST SOC, IEEE, COMPONENTS PACKAGING & MFG TECHNOL SOC, IEEE, ELECTRON DEVICES SOC, IEEE, COMP SOC DE PHYSICS OF FAILURE; ACCELERATED TESTING; COMPETING RISKS; ELECTRONICS RELIABILITY; RELIABILITY TESTING C1 NASA,HEADQUARTERS,WASHINGTON,DC 20546. 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 0-8186-6970-5 PY 1994 BP 14 EP 25 PG 12 WC Engineering, Electrical & Electronic SC Engineering GA BC58N UT WOS:A1994BC58N00003 ER PT B AU ALKALAJ, L JARVIS, B AF ALKALAJ, L JARVIS, B GP IEEE TI THE DESIGN AND IMPLEMENTATION OF NASAS ADVANCED FLIGHT COMPUTING MODULE SO 1995 IEEE MULTI-CHIP MODULE CONFERENCE, PROCEEDINGS LA English DT Proceedings Paper CT 1995 IEEE Multi-Chip Module Conference CY JAN 31-FEB 02, 1995 CL SANTA CRUZ, CA SP IEEE, CIRCUITS & SYST SOC, IEEE, COMPONENTS PACKAGING & MFG TECHNOL SOC, IEEE, ELECTRON DEVICES 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 0-8186-6970-5 PY 1994 BP 40 EP 44 PG 5 WC Engineering, Electrical & Electronic SC Engineering GA BC58N UT WOS:A1994BC58N00006 ER PT B AU KOLAWA, E LOWRY, L HERMAN, M LEE, K AF KOLAWA, E LOWRY, L HERMAN, M LEE, K GP INT SOC HYBRID MICROELECTR TI TRANSMISSION LINES FOR HIGH FREQUENCY AND HIGH DENSITY PACKAGING SO 27TH INTERNATIONAL SYMPOSIUM ON MICROELECTRONICS SE PROCEEDINGS OF THE SOCIETY OF PHOTO-OPTICAL INSTRUMENTATION ENGINEERS (SPIE) LA English DT Proceedings Paper CT 27th International Symposium on Microelectronics CY NOV 15-17, 1994 CL BOSTON, MA SP INT SOC HYBRID MICROELECTR 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 0-930815-41-6 J9 P SOC PHOTO-OPT INS PY 1994 VL 2369 BP 4 EP 7 PG 4 WC Engineering, Electrical & Electronic SC Engineering GA BB83X UT WOS:A1994BB83X00002 ER PT B AU BAHRAMI, KA LEI, MO MIKES, SC REIN, B AF BAHRAMI, KA LEI, MO MIKES, SC REIN, B GP AMER INST AERONAUT & ASTRONAUT TI ENGINEERING ANALYSIS SUBSYSTEM ENVIRONMENT FOR SPACECRAFT ENGINEERING SUBSYSTEM MISSION OPERATIONS SO 29TH INTERSOCIETY ENERGY CONVERSION ENGINEERING CONFERENCE, PTS 1-4: A COLLECTION OF TECHNICAL PAPERS LA English DT Proceedings Paper CT 29th Intersociety Energy Conversion Engineering Conference CY AUG 07-11, 1994 CL MONTEREY, CA SP AMER INST AERONAUT & ASTRONAUT C1 JET PROP LAB,PASADENA,CA 91109. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER INST AERONAUTICS & ASTRONAUTICS PI WASHINGTON PA 370 L'ENFANT PROMENADE SW, WASHINGTON, DC 20024-2518 BN 1-56347-091-8 PY 1994 BP 13 EP 18 PG 6 WC Engineering, Aerospace; Energy & Fuels; Engineering, Environmental; Engineering, Electrical & Electronic; Nuclear Science & Technology SC Engineering; Energy & Fuels; Nuclear Science & Technology GA BC17W UT WOS:A1994BC17W00003 ER PT B AU DUGAL, NR TRIMBLE, RE AF DUGAL, NR TRIMBLE, RE GP AMER INST AERONAUT & ASTRONAUT TI AN INTELLIGENT LOAD CONTROLLER SO 29TH INTERSOCIETY ENERGY CONVERSION ENGINEERING CONFERENCE, PTS 1-4: A COLLECTION OF TECHNICAL PAPERS LA English DT Proceedings Paper CT 29th Intersociety Energy Conversion Engineering Conference CY AUG 07-11, 1994 CL MONTEREY, CA SP AMER INST AERONAUT & ASTRONAUT C1 NASA,GEORGE C MARSHALL SPACE FLIGHT CTR,HUNTSVILLE,AL 35812. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER INST AERONAUTICS & ASTRONAUTICS PI WASHINGTON PA 370 L'ENFANT PROMENADE SW, WASHINGTON, DC 20024-2518 BN 1-56347-091-8 PY 1994 BP 25 EP 30 PG 6 WC Engineering, Aerospace; Energy & Fuels; Engineering, Environmental; Engineering, Electrical & Electronic; Nuclear Science & Technology SC Engineering; Energy & Fuels; Nuclear Science & Technology GA BC17W UT WOS:A1994BC17W00005 ER PT B AU DALTON, JF CLARK, KB KARMON, D AF DALTON, JF CLARK, KB KARMON, D GP AMER INST AERONAUT & ASTRONAUT TI DEVELOPMENT OF A SOLID STATE POWER SWITCH FOR THE CASSINI SPACECRAFT SO 29TH INTERSOCIETY ENERGY CONVERSION ENGINEERING CONFERENCE, PTS 1-4: A COLLECTION OF TECHNICAL PAPERS LA English DT Proceedings Paper CT 29th Intersociety Energy Conversion Engineering Conference CY AUG 07-11, 1994 CL MONTEREY, CA SP AMER INST AERONAUT & ASTRONAUT C1 JET PROP LAB,PASADENA,CA 91109. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER INST AERONAUTICS & ASTRONAUTICS PI WASHINGTON PA 370 L'ENFANT PROMENADE SW, WASHINGTON, DC 20024-2518 BN 1-56347-091-8 PY 1994 BP 31 EP 36 PG 6 WC Engineering, Aerospace; Energy & Fuels; Engineering, Environmental; Engineering, Electrical & Electronic; Nuclear Science & Technology SC Engineering; Energy & Fuels; Nuclear Science & Technology GA BC17W UT WOS:A1994BC17W00006 ER PT B AU DELIGIANNIS, F SHERWOOD, R PERRONE, D DISTEFANO, S AF DELIGIANNIS, F SHERWOOD, R PERRONE, D DISTEFANO, S GP AMER INST AERONAUT & ASTRONAUT TI TOPEX POSEIDON NICD BATTERY PERFORMANCE - COMPARISON OF FLIGHT AND GROUND TEST RESULTS SO 29TH INTERSOCIETY ENERGY CONVERSION ENGINEERING CONFERENCE, PTS 1-4: A COLLECTION OF TECHNICAL PAPERS LA English DT Proceedings Paper CT 29th Intersociety Energy Conversion Engineering Conference CY AUG 07-11, 1994 CL MONTEREY, CA SP AMER INST AERONAUT & ASTRONAUT C1 JET PROP LAB,PASADENA,CA 91109. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER INST AERONAUTICS & ASTRONAUTICS PI WASHINGTON PA 370 L'ENFANT PROMENADE SW, WASHINGTON, DC 20024-2518 BN 1-56347-091-8 PY 1994 BP 105 EP 111 PG 7 WC Engineering, Aerospace; Energy & Fuels; Engineering, Environmental; Engineering, Electrical & Electronic; Nuclear Science & Technology SC Engineering; Energy & Fuels; Nuclear Science & Technology GA BC17W UT WOS:A1994BC17W00018 ER PT B AU TIMMERMAN, PJ AF TIMMERMAN, PJ GP AMER INST AERONAUT & ASTRONAUT TI AN IMPROVED THEORETICAL NI-CD BATTERY PERFORMANCE MODEL SO 29TH INTERSOCIETY ENERGY CONVERSION ENGINEERING CONFERENCE, PTS 1-4: A COLLECTION OF TECHNICAL PAPERS LA English DT Proceedings Paper CT 29th Intersociety Energy Conversion Engineering Conference CY AUG 07-11, 1994 CL MONTEREY, CA SP AMER INST AERONAUT & ASTRONAUT C1 JET PROP LAB,PASADENA,CA 91109. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER INST AERONAUTICS & ASTRONAUTICS PI WASHINGTON PA 370 L'ENFANT PROMENADE SW, WASHINGTON, DC 20024-2518 BN 1-56347-091-8 PY 1994 BP 112 EP 117 PG 6 WC Engineering, Aerospace; Energy & Fuels; Engineering, Environmental; Engineering, Electrical & Electronic; Nuclear Science & Technology SC Engineering; Energy & Fuels; Nuclear Science & Technology GA BC17W UT WOS:A1994BC17W00019 ER PT B AU DAWSON, S PERRONE, D OTZINGER, B DISTEFANO, S AF DAWSON, S PERRONE, D OTZINGER, B DISTEFANO, S GP AMER INST AERONAUT & ASTRONAUT TI BATTERY DEFINITION FOR THE MARS ENVIRONMENTAL SURVEY MISSION (MESUR) PATHFINDER SO 29TH INTERSOCIETY ENERGY CONVERSION ENGINEERING CONFERENCE, PTS 1-4: A COLLECTION OF TECHNICAL PAPERS LA English DT Proceedings Paper CT 29th Intersociety Energy Conversion Engineering Conference CY AUG 07-11, 1994 CL MONTEREY, CA SP AMER INST AERONAUT & ASTRONAUT C1 JET PROP LAB,PASADENA,CA 91109. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER INST AERONAUTICS & ASTRONAUTICS PI WASHINGTON PA 370 L'ENFANT PROMENADE SW, WASHINGTON, DC 20024-2518 BN 1-56347-091-8 PY 1994 BP 146 EP 150 PG 5 WC Engineering, Aerospace; Energy & Fuels; Engineering, Environmental; Engineering, Electrical & Electronic; Nuclear Science & Technology SC Engineering; Energy & Fuels; Nuclear Science & Technology GA BC17W UT WOS:A1994BC17W00025 ER PT B AU PISZCZOR, MF ONEILL, MJ FRAAS, LM AF PISZCZOR, MF ONEILL, MJ FRAAS, LM GP AMER INST AERONAUT & ASTRONAUT TI DESIGN & DEVELOPMENT OF A LINE-FOCUS REFRACTIVE CONCENTRATOR ARRAY FOR SPACE SO 29TH INTERSOCIETY ENERGY CONVERSION ENGINEERING CONFERENCE, PTS 1-4: A COLLECTION OF TECHNICAL PAPERS LA English DT Proceedings Paper CT 29th Intersociety Energy Conversion Engineering Conference CY AUG 07-11, 1994 CL MONTEREY, CA SP AMER INST AERONAUT & ASTRONAUT C1 NASA,LEWIS RES CTR,CLEVELAND,OH 44135. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER INST AERONAUTICS & ASTRONAUTICS PI WASHINGTON PA 370 L'ENFANT PROMENADE SW, WASHINGTON, DC 20024-2518 BN 1-56347-091-8 PY 1994 BP 282 EP 287 PG 6 WC Engineering, Aerospace; Energy & Fuels; Engineering, Environmental; Engineering, Electrical & Electronic; Nuclear Science & Technology SC Engineering; Energy & Fuels; Nuclear Science & Technology GA BC17W UT WOS:A1994BC17W00050 ER PT B AU CHMIELEWSKI, AB EWELL, R AF CHMIELEWSKI, AB EWELL, R GP AMER INST AERONAUT & ASTRONAUT TI THE POWERSTICK SO 29TH INTERSOCIETY ENERGY CONVERSION ENGINEERING CONFERENCE, PTS 1-4: A COLLECTION OF TECHNICAL PAPERS LA English DT Proceedings Paper CT 29th Intersociety Energy Conversion Engineering Conference CY AUG 07-11, 1994 CL MONTEREY, CA SP AMER INST AERONAUT & ASTRONAUT C1 JET PROP LAB,PASADENA,CA 91109. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER INST AERONAUTICS & ASTRONAUTICS PI WASHINGTON PA 370 L'ENFANT PROMENADE SW, WASHINGTON, DC 20024-2518 BN 1-56347-091-8 PY 1994 BP 311 EP 315 PG 5 WC Engineering, Aerospace; Energy & Fuels; Engineering, Environmental; Engineering, Electrical & Electronic; Nuclear Science & Technology SC Engineering; Energy & Fuels; Nuclear Science & Technology GA BC17W UT WOS:A1994BC17W00055 ER PT B AU SHALTENS, RK BOYLE, RV AF SHALTENS, RK BOYLE, RV GP AMER INST AERONAUT & ASTRONAUT TI UPDATE OF THE 2 KW SOLAR DYNAMIC GROUND TEST DEMONSTRATION PROGRAM SO 29TH INTERSOCIETY ENERGY CONVERSION ENGINEERING CONFERENCE, PTS 1-4: A COLLECTION OF TECHNICAL PAPERS LA English DT Proceedings Paper CT 29th Intersociety Energy Conversion Engineering Conference CY AUG 07-11, 1994 CL MONTEREY, CA SP AMER INST AERONAUT & ASTRONAUT C1 NASA,LEWIS RES CTR,CLEVELAND,OH 44135. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER INST AERONAUTICS & ASTRONAUTICS PI WASHINGTON PA 370 L'ENFANT PROMENADE SW, WASHINGTON, DC 20024-2518 BN 1-56347-091-8 PY 1994 BP 359 EP 365 PG 7 WC Engineering, Aerospace; Energy & Fuels; Engineering, Environmental; Engineering, Electrical & Electronic; Nuclear Science & Technology SC Engineering; Energy & Fuels; Nuclear Science & Technology GA BC17W UT WOS:A1994BC17W00063 ER PT B AU TOLBERT, CM AF TOLBERT, CM GP AMER INST AERONAUT & ASTRONAUT TI SELECTION OF SOLAR SIMULATOR FOR SOLAR DYNAMIC GROUND TEST SO 29TH INTERSOCIETY ENERGY CONVERSION ENGINEERING CONFERENCE, PTS 1-4: A COLLECTION OF TECHNICAL PAPERS LA English DT Proceedings Paper CT 29th Intersociety Energy Conversion Engineering Conference CY AUG 07-11, 1994 CL MONTEREY, CA SP AMER INST AERONAUT & ASTRONAUT C1 NASA,LEWIS RES CTR,DIV POWER TECHNOL,CLEVELAND,OH 44135. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER INST AERONAUTICS & ASTRONAUTICS PI WASHINGTON PA 370 L'ENFANT PROMENADE SW, WASHINGTON, DC 20024-2518 BN 1-56347-091-8 PY 1994 BP 366 EP 371 PG 6 WC Engineering, Aerospace; Energy & Fuels; Engineering, Environmental; Engineering, Electrical & Electronic; Nuclear Science & Technology SC Engineering; Energy & Fuels; Nuclear Science & Technology GA BC17W UT WOS:A1994BC17W00064 ER PT B AU BENNETT, GL CAMPBELL, RW HEMLER, RJ PUTNAM, LR AF BENNETT, GL CAMPBELL, RW HEMLER, RJ PUTNAM, LR GP AMER INST AERONAUT & ASTRONAUT TI STATUS REPORT ON PERFORMANCE OF RADIOISOTOPE THERMOELECTRIC GENERATORS USING SILICON GERMANIUM THERMOELECTRIC ELEMENTS SO 29TH INTERSOCIETY ENERGY CONVERSION ENGINEERING CONFERENCE, PTS 1-4: A COLLECTION OF TECHNICAL PAPERS LA English DT Proceedings Paper CT 29th Intersociety Energy Conversion Engineering Conference CY AUG 07-11, 1994 CL MONTEREY, CA SP AMER INST AERONAUT & ASTRONAUT C1 NASA HEADQUARTERS,WASHINGTON,DC 20546. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER INST AERONAUTICS & ASTRONAUTICS PI WASHINGTON PA 370 L'ENFANT PROMENADE SW, WASHINGTON, DC 20024-2518 BN 1-56347-091-8 PY 1994 BP 529 EP 534 PG 6 WC Engineering, Aerospace; Energy & Fuels; Engineering, Environmental; Engineering, Electrical & Electronic; Nuclear Science & Technology SC Engineering; Energy & Fuels; Nuclear Science & Technology GA BC17W UT WOS:A1994BC17W00086 ER PT B AU CHMIELEWSKI, AB BORSHCHEVSKY, A LANGE, R AF CHMIELEWSKI, AB BORSHCHEVSKY, A LANGE, R GP AMER INST AERONAUT & ASTRONAUT TI A SURVEY OF CURRENT RUSSIAN RTG CAPABILITIES SO 29TH INTERSOCIETY ENERGY CONVERSION ENGINEERING CONFERENCE, PTS 1-4: A COLLECTION OF TECHNICAL PAPERS LA English DT Proceedings Paper CT 29th Intersociety Energy Conversion Engineering Conference CY AUG 07-11, 1994 CL MONTEREY, CA SP AMER INST AERONAUT & ASTRONAUT C1 JET PROP LAB,PASADENA,CA 91109. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER INST AERONAUTICS & ASTRONAUTICS PI WASHINGTON PA 370 L'ENFANT PROMENADE SW, WASHINGTON, DC 20024-2518 BN 1-56347-091-8 PY 1994 BP 559 EP 563 PG 5 WC Engineering, Aerospace; Energy & Fuels; Engineering, Environmental; Engineering, Electrical & Electronic; Nuclear Science & Technology SC Engineering; Energy & Fuels; Nuclear Science & Technology GA BC17W UT WOS:A1994BC17W00091 ER PT B AU EWELL, R ZOLTAN, A AF EWELL, R ZOLTAN, A GP AMER INST AERONAUT & ASTRONAUT TI SP-100 THERMOELECTRIC CELL TESTING AT JPL SO 29TH INTERSOCIETY ENERGY CONVERSION ENGINEERING CONFERENCE, PTS 1-4: A COLLECTION OF TECHNICAL PAPERS LA English DT Proceedings Paper CT 29th Intersociety Energy Conversion Engineering Conference CY AUG 07-11, 1994 CL MONTEREY, CA SP AMER INST AERONAUT & ASTRONAUT C1 JET PROP LAB,PASADENA,CA 91109. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER INST AERONAUTICS & ASTRONAUTICS PI WASHINGTON PA 370 L'ENFANT PROMENADE SW, WASHINGTON, DC 20024-2518 BN 1-56347-091-8 PY 1994 BP 564 EP 568 PG 5 WC Engineering, Aerospace; Energy & Fuels; Engineering, Environmental; Engineering, Electrical & Electronic; Nuclear Science & Technology SC Engineering; Energy & Fuels; Nuclear Science & Technology GA BC17W UT WOS:A1994BC17W00092 ER PT B AU CAILLAT, T BORSHCHEVSKY, A FLEURIAL, JP VANDERSANDE, JW AF CAILLAT, T BORSHCHEVSKY, A FLEURIAL, JP VANDERSANDE, JW GP AMER INST AERONAUT & ASTRONAUT TI PROMISING THERMOELECTRIC MATERIALS FOR TERRESTRIAL-SPACE APPLICATIONS SO 29TH INTERSOCIETY ENERGY CONVERSION ENGINEERING CONFERENCE, PTS 1-4: A COLLECTION OF TECHNICAL PAPERS LA English DT Proceedings Paper CT 29th Intersociety Energy Conversion Engineering Conference CY AUG 07-11, 1994 CL MONTEREY, CA SP AMER INST AERONAUT & ASTRONAUT C1 JET PROP LAB,PASADENA,CA 91109. NR 0 TC 0 Z9 0 U1 1 U2 3 PU AMER INST AERONAUTICS & ASTRONAUTICS PI WASHINGTON PA 370 L'ENFANT PROMENADE SW, WASHINGTON, DC 20024-2518 BN 1-56347-091-8 PY 1994 BP 575 EP 579 PG 5 WC Engineering, Aerospace; Energy & Fuels; Engineering, Environmental; Engineering, Electrical & Electronic; Nuclear Science & Technology SC Engineering; Energy & Fuels; Nuclear Science & Technology GA BC17W UT WOS:A1994BC17W00094 ER PT B AU BRANDHORST, HW AF BRANDHORST, HW GP AMER INST AERONAUT & ASTRONAUT TI SPACE POWER - WHATS OLD IS NEW AGAIN SO 29TH INTERSOCIETY ENERGY CONVERSION ENGINEERING CONFERENCE, PTS 1-4: A COLLECTION OF TECHNICAL PAPERS LA English DT Proceedings Paper CT 29th Intersociety Energy Conversion Engineering Conference CY AUG 07-11, 1994 CL MONTEREY, CA SP AMER INST AERONAUT & ASTRONAUT C1 NASA,LEWIS RES CTR,DIV POWER TECHNOL,CLEVELAND,OH 44135. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER INST AERONAUTICS & ASTRONAUTICS PI WASHINGTON PA 370 L'ENFANT PROMENADE SW, WASHINGTON, DC 20024-2518 BN 1-56347-091-8 PY 1994 BP 592 EP 597 PG 6 WC Engineering, Aerospace; Energy & Fuels; Engineering, Environmental; Engineering, Electrical & Electronic; Nuclear Science & Technology SC Engineering; Energy & Fuels; Nuclear Science & Technology GA BC17W UT WOS:A1994BC17W00097 ER PT B AU BENNETT, GL AF BENNETT, GL GP AMER INST AERONAUT & ASTRONAUT TI ENHANCING ACCESS TO SPACE - NASAS ADVANCED SPACE TRANSPORTATION PROGRAM SO 29TH INTERSOCIETY ENERGY CONVERSION ENGINEERING CONFERENCE, PTS 1-4: A COLLECTION OF TECHNICAL PAPERS LA English DT Proceedings Paper CT 29th Intersociety Energy Conversion Engineering Conference CY AUG 07-11, 1994 CL MONTEREY, CA SP AMER INST AERONAUT & ASTRONAUT C1 NASA,WASHINGTON,DC 20546. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER INST AERONAUTICS & ASTRONAUTICS PI WASHINGTON PA 370 L'ENFANT PROMENADE SW, WASHINGTON, DC 20024-2518 BN 1-56347-091-8 PY 1994 BP 598 EP 603 PG 6 WC Engineering, Aerospace; Energy & Fuels; Engineering, Environmental; Engineering, Electrical & Electronic; Nuclear Science & Technology SC Engineering; Energy & Fuels; Nuclear Science & Technology GA BC17W UT WOS:A1994BC17W00098 ER PT B AU SMITH, WL AF SMITH, WL GP AMER INST AERONAUT & ASTRONAUT TI SPACE SCIENCE MISSION POWER REQUIREMENTS AND ISSUES SO 29TH INTERSOCIETY ENERGY CONVERSION ENGINEERING CONFERENCE, PTS 1-4: A COLLECTION OF TECHNICAL PAPERS LA English DT Proceedings Paper CT 29th Intersociety Energy Conversion Engineering Conference CY AUG 07-11, 1994 CL MONTEREY, CA SP AMER INST AERONAUT & ASTRONAUT C1 NASA HEADQUARTERS,OFF SPACE SCI,WASHINGTON,DC 20546. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER INST AERONAUTICS & ASTRONAUTICS PI WASHINGTON PA 370 L'ENFANT PROMENADE SW, WASHINGTON, DC 20024-2518 BN 1-56347-091-8 PY 1994 BP 604 EP 607 PG 4 WC Engineering, Aerospace; Energy & Fuels; Engineering, Environmental; Engineering, Electrical & Electronic; Nuclear Science & Technology SC Engineering; Energy & Fuels; Nuclear Science & Technology GA BC17W UT WOS:A1994BC17W00099 ER PT B AU HUCKINS, E AHLF, P AF HUCKINS, E AHLF, P GP AMER INST AERONAUT & ASTRONAUT TI SPACE STATION POWER REQUIREMENTS AND ISSUES SO 29TH INTERSOCIETY ENERGY CONVERSION ENGINEERING CONFERENCE, PTS 1-4: A COLLECTION OF TECHNICAL PAPERS LA English DT Proceedings Paper CT 29th Intersociety Energy Conversion Engineering Conference CY AUG 07-11, 1994 CL MONTEREY, CA SP AMER INST AERONAUT & ASTRONAUT C1 NASA,WASHINGTON,DC. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER INST AERONAUTICS & ASTRONAUTICS PI WASHINGTON PA 370 L'ENFANT PROMENADE SW, WASHINGTON, DC 20024-2518 BN 1-56347-091-8 PY 1994 BP 608 EP 612 PG 5 WC Engineering, Aerospace; Energy & Fuels; Engineering, Environmental; Engineering, Electrical & Electronic; Nuclear Science & Technology SC Engineering; Energy & Fuels; Nuclear Science & Technology GA BC17W UT WOS:A1994BC17W00100 ER PT B AU BENNETT, GL CURRAN, FM HAMLEY, JA MYERS, RM BYERS, DC BROPHY, JR STOCKY, JF AF BENNETT, GL CURRAN, FM HAMLEY, JA MYERS, RM BYERS, DC BROPHY, JR STOCKY, JF GP AMER INST AERONAUT & ASTRONAUT TI THRUSTING TOWARD APPLICATION - AN OVERVIEW OF NASAS ELECTRIC PROPULSION PROGRAM SO 29TH INTERSOCIETY ENERGY CONVERSION ENGINEERING CONFERENCE, PTS 1-4: A COLLECTION OF TECHNICAL PAPERS LA English DT Proceedings Paper CT 29th Intersociety Energy Conversion Engineering Conference CY AUG 07-11, 1994 CL MONTEREY, CA SP AMER INST AERONAUT & ASTRONAUT C1 NASA HEADQUARTERS,WASHINGTON,DC 20546. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER INST AERONAUTICS & ASTRONAUTICS PI WASHINGTON PA 370 L'ENFANT PROMENADE SW, WASHINGTON, DC 20024-2518 BN 1-56347-091-8 PY 1994 BP 734 EP 743 PG 10 WC Engineering, Aerospace; Energy & Fuels; Engineering, Environmental; Engineering, Electrical & Electronic; Nuclear Science & Technology SC Engineering; Energy & Fuels; Nuclear Science & Technology GA BC17W UT WOS:A1994BC17W00123 ER PT B AU MYERS, RM OLESON, SR CURRAN, FM AF MYERS, RM OLESON, SR CURRAN, FM GP AMER INST AERONAUT & ASTRONAUT TI SMALL SATELLITE ELECTRIC PROPULSION OPTIONS SO 29TH INTERSOCIETY ENERGY CONVERSION ENGINEERING CONFERENCE, PTS 1-4: A COLLECTION OF TECHNICAL PAPERS LA English DT Proceedings Paper CT 29th Intersociety Energy Conversion Engineering Conference CY AUG 07-11, 1994 CL MONTEREY, CA SP AMER INST AERONAUT & ASTRONAUT C1 NASA,LEWIS RES CTR,NYMA INC,CLEVELAND,OH 44135. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER INST AERONAUTICS & ASTRONAUTICS PI WASHINGTON PA 370 L'ENFANT PROMENADE SW, WASHINGTON, DC 20024-2518 BN 1-56347-091-8 PY 1994 BP 744 EP 749 PG 6 WC Engineering, Aerospace; Energy & Fuels; Engineering, Environmental; Engineering, Electrical & Electronic; Nuclear Science & Technology SC Engineering; Energy & Fuels; Nuclear Science & Technology GA BC17W UT WOS:A1994BC17W00124 ER PT B AU SOVEY, JS HAAG, TW HAMLEY, JA MANTENIEKS, MA PATTERSON, MJ PINERO, LR RAWLIN, VK KUSSMAUL, MT MANZELLA, DH MYERS, RM SARVERVERHEY, TR SOULAS, GC CARTIER, KC AF SOVEY, JS HAAG, TW HAMLEY, JA MANTENIEKS, MA PATTERSON, MJ PINERO, LR RAWLIN, VK KUSSMAUL, MT MANZELLA, DH MYERS, RM SARVERVERHEY, TR SOULAS, GC CARTIER, KC GP AMER INST AERONAUT & ASTRONAUT TI DEVELOPMENT STATUS OF THE NASA 30-CM ION THRUSTER AND POWER PROCESSOR SO 29TH INTERSOCIETY ENERGY CONVERSION ENGINEERING CONFERENCE, PTS 1-4: A COLLECTION OF TECHNICAL PAPERS LA English DT Proceedings Paper CT 29th Intersociety Energy Conversion Engineering Conference CY AUG 07-11, 1994 CL MONTEREY, CA SP AMER INST AERONAUT & ASTRONAUT C1 NASA,LEWIS RES CTR,CLEVELAND,OH 44135. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER INST AERONAUTICS & ASTRONAUTICS PI WASHINGTON PA 370 L'ENFANT PROMENADE SW, WASHINGTON, DC 20024-2518 BN 1-56347-091-8 PY 1994 BP 756 EP 763 PG 8 WC Engineering, Aerospace; Energy & Fuels; Engineering, Environmental; Engineering, Electrical & Electronic; Nuclear Science & Technology SC Engineering; Energy & Fuels; Nuclear Science & Technology GA BC17W UT WOS:A1994BC17W00126 ER PT B AU CURRAN, FM PISZCZOR, MF ALLEN, DM CAVENY, LH BROPHY, JR GAMER, C AF CURRAN, FM PISZCZOR, MF ALLEN, DM CAVENY, LH BROPHY, JR GAMER, C GP AMER INST AERONAUT & ASTRONAUT TI SPACECRAFT POWER PROPULSION SYNERGIES SO 29TH INTERSOCIETY ENERGY CONVERSION ENGINEERING CONFERENCE, PTS 1-4: A COLLECTION OF TECHNICAL PAPERS LA English DT Proceedings Paper CT 29th Intersociety Energy Conversion Engineering Conference CY AUG 07-11, 1994 CL MONTEREY, CA SP AMER INST AERONAUT & ASTRONAUT C1 NASA,LEWIS RES CTR,CLEVELAND,OH 44135. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER INST AERONAUTICS & ASTRONAUTICS PI WASHINGTON PA 370 L'ENFANT PROMENADE SW, WASHINGTON, DC 20024-2518 BN 1-56347-091-8 PY 1994 BP 764 EP 769 PG 6 WC Engineering, Aerospace; Energy & Fuels; Engineering, Environmental; Engineering, Electrical & Electronic; Nuclear Science & Technology SC Engineering; Energy & Fuels; Nuclear Science & Technology GA BC17W UT WOS:A1994BC17W00127 ER PT B AU RYAN, MA KISOR, A WILLIAMS, RM JEFFRIESNAKAMURA, B OCONNOR, D AF RYAN, MA KISOR, A WILLIAMS, RM JEFFRIESNAKAMURA, B OCONNOR, D GP AMER INST AERONAUT & ASTRONAUT TI LIFETIMES OF THIN FILM AMTEC ELECTRODES SO 29TH INTERSOCIETY ENERGY CONVERSION ENGINEERING CONFERENCE, PTS 1-4: A COLLECTION OF TECHNICAL PAPERS LA English DT Proceedings Paper CT 29th Intersociety Energy Conversion Engineering Conference CY AUG 07-11, 1994 CL MONTEREY, CA SP AMER INST AERONAUT & ASTRONAUT C1 JET PROP LAB,PASADENA,CA 91109. NR 0 TC 2 Z9 2 U1 0 U2 0 PU AMER INST AERONAUTICS & ASTRONAUTICS PI WASHINGTON PA 370 L'ENFANT PROMENADE SW, WASHINGTON, DC 20024-2518 BN 1-56347-091-8 PY 1994 BP 877 EP 881 PG 5 WC Engineering, Aerospace; Energy & Fuels; Engineering, Environmental; Engineering, Electrical & Electronic; Nuclear Science & Technology SC Engineering; Energy & Fuels; Nuclear Science & Technology GA BC17W UT WOS:A1994BC17W00147 ER PT B AU WILLIAMS, RM KISOR, A RYAN, MA JEFFRIESNAKAMURA, B KIKKERT, S OCONNOR, DE AF WILLIAMS, RM KISOR, A RYAN, MA JEFFRIESNAKAMURA, B KIKKERT, S OCONNOR, DE GP AMER INST AERONAUT & ASTRONAUT TI POTASSIUM beta''-ALUMINA POTASSIUM MOLYBDENUM ELECTROCHEMICAL CELLS SO 29TH INTERSOCIETY ENERGY CONVERSION ENGINEERING CONFERENCE, PTS 1-4: A COLLECTION OF TECHNICAL PAPERS LA English DT Proceedings Paper CT 29th Intersociety Energy Conversion Engineering Conference CY AUG 07-11, 1994 CL MONTEREY, CA SP AMER INST AERONAUT & ASTRONAUT C1 JET PROP LAB,PASADENA,CA 91109. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER INST AERONAUTICS & ASTRONAUTICS PI WASHINGTON PA 370 L'ENFANT PROMENADE SW, WASHINGTON, DC 20024-2518 BN 1-56347-091-8 PY 1994 BP 888 EP 893 PG 6 WC Engineering, Aerospace; Energy & Fuels; Engineering, Environmental; Engineering, Electrical & Electronic; Nuclear Science & Technology SC Engineering; Energy & Fuels; Nuclear Science & Technology GA BC17W UT WOS:A1994BC17W00149 ER PT B AU BENNETT, GL AF BENNETT, GL GP AMER INST AERONAUT & ASTRONAUT TI HERETICAL SCIENCE - BEYOND THE BOUNDARIES OF PATHOLOGICAL SCIENCE SO 29TH INTERSOCIETY ENERGY CONVERSION ENGINEERING CONFERENCE, PTS 1-4: A COLLECTION OF TECHNICAL PAPERS LA English DT Proceedings Paper CT 29th Intersociety Energy Conversion Engineering Conference CY AUG 07-11, 1994 CL MONTEREY, CA SP AMER INST AERONAUT & ASTRONAUT C1 NASA,WASHINGTON,DC 20546. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMER INST AERONAUTICS & ASTRONAUTICS PI WASHINGTON PA 370 L'ENFANT PROMENADE SW, WASHINGTON, DC 20024-2518 BN 1-56347-091-8 PY 1994 BP 1207 EP 1212 PG 6 WC Engineering, Aerospace; Energy & Fuels; Engineering, Environmental; Engineering, Electrical & Electronic; Nuclear Science & Technology SC Engineering; Energy & Fuels; Nuclear Science & Technology GA BC17W UT WOS:A1994BC17W00205 ER PT B AU POOL, SL AF POOL, SL BE Draeger, J Schwartz, R TI THE ROLE OF HUMAN PHYSIOLOGICAL ADAPTATION IN SPACE MEDICINE IN THE UNITED-STATES SPACE PROGRAM SO 41ST INTERNATIONAL CONGRESS OF AVIATION AND SPACE MEDICINE LA English DT Proceedings Paper CT 41st International Congress of Aviation and Space Medicine CY SEP 12-16, 1993 CL HAMBURG, GERMANY SP INT ACAD AVIAT & SPACE MED RP POOL, SL (reprint author), NASA,LYNDON B JOHNSON SPACE CTR,DIV MED SCI,HOUSTON,TX 77058, USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU MONDUZZI EDITORE PI 40128 BOLOGNA PA VIA FERRARESE 119/2, 40128 BOLOGNA, ITALY BN 88-323-0912-2 PY 1994 BP 3 EP 8 PG 6 GA BB86E UT WOS:A1994BB86E00001 ER PT B AU WINGET, CM SCHAEFER, RL JARVI, J AF WINGET, CM SCHAEFER, RL JARVI, J BE Draeger, J Schwartz, R TI APPROACHES, PROBLEMS AND ANSWERS FOR THE ADAPTATION OF 5 EXPERIMENTS FLOWN ON THE 1ST INTERNATIONAL MICROGRAVITY LABORATORY (IML-1) SO 41ST INTERNATIONAL CONGRESS OF AVIATION AND SPACE MEDICINE LA English DT Proceedings Paper CT 41st International Congress of Aviation and Space Medicine CY SEP 12-16, 1993 CL HAMBURG, GERMANY SP INT ACAD AVIAT & SPACE MED RP WINGET, CM (reprint author), NASA,AMES RES CTR,SPACE LIFE SCI PAYLOADS OFF,MOFFETT FIELD,CA 94035, USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU MONDUZZI EDITORE PI 40128 BOLOGNA PA VIA FERRARESE 119/2, 40128 BOLOGNA, ITALY BN 88-323-0912-2 PY 1994 BP 9 EP 14 PG 6 GA BB86E UT WOS:A1994BB86E00002 ER PT B AU NICOGOSSIAN, AE GAISER, KK FREY, MAB DARDANO, J AF NICOGOSSIAN, AE GAISER, KK FREY, MAB DARDANO, J BE Draeger, J Schwartz, R TI BIOMEDICAL RESEARCH CONTRIBUTIONS IN AVIATION AND SPACE SO 41ST INTERNATIONAL CONGRESS OF AVIATION AND SPACE MEDICINE LA English DT Proceedings Paper CT 41st International Congress of Aviation and Space Medicine CY SEP 12-16, 1993 CL HAMBURG, GERMANY SP INT ACAD AVIAT & SPACE MED RP NICOGOSSIAN, AE (reprint author), NASA,LOCKHEED ENGN & SCI CO,OFF LIFE & MICROGRAV SCI & APPLICAT,WASHINGTON,DC 20546, USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU MONDUZZI EDITORE PI 40128 BOLOGNA PA VIA FERRARESE 119/2, 40128 BOLOGNA, ITALY BN 88-323-0912-2 PY 1994 BP 243 EP 249 PG 7 GA BB86E UT WOS:A1994BB86E00038 ER PT B AU TAUB, SR ALTEROVITZ, SA YOUNG, PG EBIHARA, BT ROMANOFSKY, RR AF TAUB, SR ALTEROVITZ, SA YOUNG, PG EBIHARA, BT ROMANOFSKY, RR BE Caldwell, M TI Cryogenic probe station for use in automated microwave and noise figure measurements SO 43RD ARFTG CONFERENCE DIGEST, SPRING 1994 LA English DT Proceedings Paper CT 43rd ARFTG Conference CY MAY 27, 1994 CL SAN DIEGO, CA SP Automat RF Tech Grp C1 NASA,LEWIS RES CTR,CLEVELAND,OH 44135. NR 0 TC 2 Z9 2 U1 0 U2 0 PU AUTOMATIC RADIO FREQUENCY TECHNIQUES GROUP PI TEMPE PA 1008 E, BASELINE ROAD, #955, TEMPE, AZ 85283-1314 PY 1994 BP 34 EP 42 DI 10.1109/ARFTG.1994.327056 PG 9 WC Computer Science, Hardware & Architecture; Engineering, Electrical & Electronic SC Computer Science; Engineering GA BD47U UT WOS:A1994BD47U00005 ER PT B AU WITHEROW, WK ROGERS, JR FACEMIRE, BR ARMSTRONG, SD TROLINGER, JD WEBER, D VIKRAM, C AF WITHEROW, WK ROGERS, JR FACEMIRE, BR ARMSTRONG, SD TROLINGER, JD WEBER, D VIKRAM, C BE Schiffman, RA Andrews, JB TI METHODS TO DETECT AND MEASURE GRADIENTS IN FLUIDS AND MATERIALS PROCESSING SO 6TH INTERNATIONAL SYMPOSIUM ON EXPERIMENTAL METHODS FOR MICROGRAVITY MATERIALS SCIENCE LA English DT Proceedings Paper CT 6th International Symposium on Experimental Methods for Microgravity Materials Science, at the 123rd Annual TMS Meeting CY FEB 28-MAR 02, 1994 CL SAN FRANCISCO, CA SP MINERALS MET & MAT SOC, NASA, MICROGRAV SCI, ASM MSD, THERMODYNAM & PHASE EQUILIBRIA COMM, TMS SOLIDIFICAT COMM C1 NASA,GEORGE C MARSHALL SPACE FLIGHT CTR,DIV MICROGRAV SCI & APPLICAT,HUNTSVILLE,AL 35812. 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 0-87339-232-9 PY 1994 BP 33 EP 37 PG 5 WC Engineering, Aerospace; Materials Science, Characterization & Testing SC Engineering; Materials Science GA BB75M UT WOS:A1994BB75M00007 ER PT B AU MAN, KF BOUMSELLEK, S CHUTJIAN, A AF MAN, KF BOUMSELLEK, S CHUTJIAN, A BE Schiffman, RA Andrews, JB TI RESONANT ATTACHMENT METHOD FOR TRACE OXYGEN DETECTION SO 6TH INTERNATIONAL SYMPOSIUM ON EXPERIMENTAL METHODS FOR MICROGRAVITY MATERIALS SCIENCE LA English DT Proceedings Paper CT 6th International Symposium on Experimental Methods for Microgravity Materials Science, at the 123rd Annual TMS Meeting CY FEB 28-MAR 02, 1994 CL SAN FRANCISCO, CA SP MINERALS MET & MAT SOC, NASA, MICROGRAV SCI, ASM MSD, THERMODYNAM & PHASE EQUILIBRIA COMM, TMS SOLIDIFICAT 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 0-87339-232-9 PY 1994 BP 39 EP 42 PG 4 WC Engineering, Aerospace; Materials Science, Characterization & Testing SC Engineering; Materials Science GA BB75M UT WOS:A1994BB75M00008 ER PT B AU MAN, KF SHARMA, PK HICKEY, GS WATKINS, JL AF MAN, KF SHARMA, PK HICKEY, GS WATKINS, JL BE Schiffman, RA Andrews, JB TI EVAPORATION STUDIES OF THE METALS AND ALLOYS USED IN THE TEMPUS FLIGHT EXPERIMENTS SO 6TH INTERNATIONAL SYMPOSIUM ON EXPERIMENTAL METHODS FOR MICROGRAVITY MATERIALS SCIENCE LA English DT Proceedings Paper CT 6th International Symposium on Experimental Methods for Microgravity Materials Science, at the 123rd Annual TMS Meeting CY FEB 28-MAR 02, 1994 CL SAN FRANCISCO, CA SP MINERALS MET & MAT SOC, NASA, MICROGRAV SCI, ASM MSD, THERMODYNAM & PHASE EQUILIBRIA COMM, TMS SOLIDIFICAT 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 0-87339-232-9 PY 1994 BP 53 EP 59 PG 7 WC Engineering, Aerospace; Materials Science, Characterization & Testing SC Engineering; Materials Science GA BB75M UT WOS:A1994BB75M00010 ER PT B AU SHARMA, PK HICKEY, GS MAN, KF AF SHARMA, PK HICKEY, GS MAN, KF BE Schiffman, RA Andrews, JB TI PRELIMINARY TEST RESULTS ON A CLOSED-LOOP CONTAMINANT REMOVAL SYSTEM FOR PROCESSING OF METALLIC MELTS SO 6TH INTERNATIONAL SYMPOSIUM ON EXPERIMENTAL METHODS FOR MICROGRAVITY MATERIALS SCIENCE LA English DT Proceedings Paper CT 6th International Symposium on Experimental Methods for Microgravity Materials Science, at the 123rd Annual TMS Meeting CY FEB 28-MAR 02, 1994 CL SAN FRANCISCO, CA SP MINERALS MET & MAT SOC, NASA, MICROGRAV SCI, ASM MSD, THERMODYNAM & PHASE EQUILIBRIA COMM, TMS SOLIDIFICAT 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 0-87339-232-9 PY 1994 BP 81 EP 84 PG 4 WC Engineering, Aerospace; Materials Science, Characterization & Testing SC Engineering; Materials Science GA BB75M UT WOS:A1994BB75M00014 ER PT B AU MORRISON, DR MOSIER, B CASSANTO, JM AF MORRISON, DR MOSIER, B CASSANTO, JM BE Schiffman, RA Andrews, JB TI IMMISCIBLE-PHASE MICROENCAPSULATION OF DRUGS IN MICROGRAVITY SO 6TH INTERNATIONAL SYMPOSIUM ON EXPERIMENTAL METHODS FOR MICROGRAVITY MATERIALS SCIENCE LA English DT Proceedings Paper CT 6th International Symposium on Experimental Methods for Microgravity Materials Science, at the 123rd Annual TMS Meeting CY FEB 28-MAR 02, 1994 CL SAN FRANCISCO, CA SP MINERALS MET & MAT SOC, NASA, MICROGRAV SCI, ASM MSD, THERMODYNAM & PHASE EQUILIBRIA COMM, TMS SOLIDIFICAT COMM C1 NASA,LYNDON B JOHNSON SPACE CTR,HOUSTON,TX 77058. 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 0-87339-232-9 PY 1994 BP 199 EP 207 PG 9 WC Engineering, Aerospace; Materials Science, Characterization & Testing SC Engineering; Materials Science GA BB75M UT WOS:A1994BB75M00032 ER PT B AU STEINMAN, JS WIELAND, F AF STEINMAN, JS WIELAND, F BE Arvind, DK Bagrodia, R Lin, JYB TI PARALLEL PROXIMITY DETECTION AND THE DISTRIBUTION LIST ALGORITHM SO 8TH WORKSHOP ON PARALLEL AND DISTRIBUTED SIMULATION (PADS '94) LA English DT Proceedings Paper CT 8th Workshop on Parallel and Distributed Simulation (PADS 94) CY JUL 06-08, 1994 CL EDINBURGH, SCOTLAND SP SIGSIM, ASSOC COMP MACHINERY, SOC COMP SIMULAT INT, IEEE, COMP SOC DE PROXIMITY DETECTION; SPEEDES; BREATHING TIME BUCKETS; TIME WARP; OBJECT-ORIENTED SIMULATION; INTERACTIVE SIMULATION; PARALLEL DISCRETE-EVENT SIMULATION 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 1-56555-027-7 PY 1994 BP 3 EP 11 PG 9 WC Computer Science, Theory & Methods SC Computer Science GA BB79B UT WOS:A1994BB79B00001 ER PT B AU DICKENS, PM HEIDELBERGER, P NICOL, DM AF DICKENS, PM HEIDELBERGER, P NICOL, DM BE Arvind, DK Bagrodia, R Lin, JYB TI A DISTRIBUTED MEMORY LAPSE - PARALLEL SIMULATION OF MESSAGE-PASSING PROGRAMS SO 8TH WORKSHOP ON PARALLEL AND DISTRIBUTED SIMULATION (PADS '94) LA English DT Proceedings Paper CT 8th Workshop on Parallel and Distributed Simulation (PADS 94) CY JUL 06-08, 1994 CL EDINBURGH, SCOTLAND SP SIGSIM, ASSOC COMP MACHINERY, SOC COMP SIMULAT INT, IEEE, COMP SOC C1 NASA,LANGLEY RES CTR,HAMPTON,VA 23681. NR 0 TC 1 Z9 1 U1 0 U2 0 PU SOC COMPUTER SIMULATION INT PI SAN DIEGO PA PO BOX 17900, SAN DIEGO, CA 92177 BN 1-56555-027-7 PY 1994 BP 32 EP 38 PG 7 WC Computer Science, Theory & Methods SC Computer Science GA BB79B UT WOS:A1994BB79B00005 ER PT B AU STEINMAN, JS AF STEINMAN, JS BE Arvind, DK Bagrodia, R Lin, JYB TI DISCRETE-EVENT SIMULATION AND THE EVENT HORIZON SO 8TH WORKSHOP ON PARALLEL AND DISTRIBUTED SIMULATION (PADS '94) LA English DT Proceedings Paper CT 8th Workshop on Parallel and Distributed Simulation (PADS 94) CY JUL 06-08, 1994 CL EDINBURGH, SCOTLAND SP SIGSIM, ASSOC COMP MACHINERY, SOC COMP SIMULAT INT, IEEE, COMP SOC DE EVENT HORIZON; SPEEDES; PARALLEL DISCRETE EVENT SIMULATION; BREATHING TIME BUCKETS; TIME WARP C1 JET PROP LAB,PASADENA,CA 91109. NR 0 TC 3 Z9 3 U1 0 U2 0 PU SOC COMPUTER SIMULATION INT PI SAN DIEGO PA PO BOX 17900, SAN DIEGO, CA 92177 BN 1-56555-027-7 PY 1994 BP 39 EP 49 PG 11 WC Computer Science, Theory & Methods SC Computer Science GA BB79B UT WOS:A1994BB79B00006 ER PT B AU THOMAS, VC ALEXANDER, JW DENNISON, EW WADDELL, P BORGHI, G PROCOPIO, D AF THOMAS, VC ALEXANDER, JW DENNISON, EW WADDELL, P BORGHI, G PROCOPIO, D BE Masten, MK Stockum, LA Birnhaum, MM Sevaston, GE TI CASSINI STAR TRACKING AND IDENTIFICATION ARCHITECTURE SO ACQUISITION, TRACKING, AND POINTING VIII SE PROCEEDINGS OF THE SOCIETY OF PHOTO-OPTICAL INSTRUMENTATION ENGINEERS (SPIE) LA English DT Proceedings Paper CT Conference on Acquisition, Tracking, and Pointing VIII CY APR 05-08, 1994 CL ORLANDO, FL SP SOC PHOTO OPT INSTRUMENTAT ENGINEERS C1 JET PROP LAB,PASADENA,CA 91109. NR 0 TC 3 Z9 3 U1 0 U2 0 PU SPIE - INT SOC OPTICAL ENGINEERING PI BELLINGHAM PA PO BOX 10, BELLINGHAM, WA 98227-0010 BN 0-8194-1525-1 J9 P SOC PHOTO-OPT INS PY 1994 VL 2221 BP 15 EP 26 DI 10.1117/12.178934 PG 12 WC Engineering, Aerospace; Optics SC Engineering; Optics GA BA83U UT WOS:A1994BA83U00002 ER PT B AU CHU, CC ZHU, DQ UDOMKESMALEE, S POMERANTZ, MI AF CHU, CC ZHU, DQ UDOMKESMALEE, S POMERANTZ, MI BE Masten, MK Stockum, LA Birnhaum, MM Sevaston, GE TI REALIZATION OF AUTONOMOUS IMAGE-BASED SPACECRAFT POINTING SYSTEMS - PLANETARY FLYBY EXAMPLE SO ACQUISITION, TRACKING, AND POINTING VIII SE PROCEEDINGS OF THE SOCIETY OF PHOTO-OPTICAL INSTRUMENTATION ENGINEERS (SPIE) LA English DT Proceedings Paper CT Conference on Acquisition, Tracking, and Pointing VIII CY APR 05-08, 1994 CL ORLANDO, FL SP SOC PHOTO OPT INSTRUMENTAT ENGINEERS C1 JET PROP LAB,PASADENA,CA 91109. NR 0 TC 2 Z9 2 U1 0 U2 0 PU SPIE - INT SOC OPTICAL ENGINEERING PI BELLINGHAM PA PO BOX 10, BELLINGHAM, WA 98227-0010 BN 0-8194-1525-1 J9 P SOC PHOTO-OPT INS PY 1994 VL 2221 BP 27 EP 40 DI 10.1117/12.178951 PG 14 WC Engineering, Aerospace; Optics SC Engineering; Optics GA BA83U UT WOS:A1994BA83U00003 ER PT B AU ANSARI, H VOISINET, L AF ANSARI, H VOISINET, L BE Masten, MK Stockum, LA Birnhaum, MM Sevaston, GE TI CCD-BASED CONTROL LOOP FOR PRECISION BEAM POINTING SO ACQUISITION, TRACKING, AND POINTING VIII SE PROCEEDINGS OF THE SOCIETY OF PHOTO-OPTICAL INSTRUMENTATION ENGINEERS (SPIE) LA English DT Proceedings Paper CT Conference on Acquisition, Tracking, and Pointing VIII CY APR 05-08, 1994 CL ORLANDO, FL SP SOC PHOTO OPT INSTRUMENTAT ENGINEERS C1 JET PROP LAB,PASADENA,CA 91109. 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 0-8194-1525-1 J9 P SOC PHOTO-OPT INS PY 1994 VL 2221 BP 148 EP 151 DI 10.1117/12.178977 PG 4 WC Engineering, Aerospace; Optics SC Engineering; Optics GA BA83U UT WOS:A1994BA83U00013 ER PT B AU RUSSELL, D ANSARI, H AF RUSSELL, D ANSARI, H BE Masten, MK Stockum, LA Birnhaum, MM Sevaston, GE TI HIGHLY ACCURATE TRACKING SYSTEM FOR A LASER COMMUNICATIONS LINK SO ACQUISITION, TRACKING, AND POINTING VIII SE PROCEEDINGS OF THE SOCIETY OF PHOTO-OPTICAL INSTRUMENTATION ENGINEERS (SPIE) LA English DT Proceedings Paper CT Conference on Acquisition, Tracking, and Pointing VIII CY APR 05-08, 1994 CL ORLANDO, FL SP SOC PHOTO OPT INSTRUMENTAT ENGINEERS C1 JET PROP LAB,PASADENA,CA 91109. NR 0 TC 2 Z9 2 U1 0 U2 0 PU SPIE - INT SOC OPTICAL ENGINEERING PI BELLINGHAM PA PO BOX 10, BELLINGHAM, WA 98227-0010 BN 0-8194-1525-1 J9 P SOC PHOTO-OPT INS PY 1994 VL 2221 BP 152 EP 155 DI 10.1117/12.178978 PG 4 WC Engineering, Aerospace; Optics SC Engineering; Optics GA BA83U UT WOS:A1994BA83U00014 ER PT B AU CHAKRAVARTHI, PR CHEN, CC AF CHAKRAVARTHI, PR CHEN, CC BE Masten, MK Stockum, LA Birnhaum, MM Sevaston, GE TI SPATIAL ACQUISITION IN THE PRESENCE OF SATELLITE VIBRATIONS FOR FREE-SPACE OPTICAL COMMUNICATION LINK SO ACQUISITION, TRACKING, AND POINTING VIII SE PROCEEDINGS OF THE SOCIETY OF PHOTO-OPTICAL INSTRUMENTATION ENGINEERS (SPIE) LA English DT Proceedings Paper CT Conference on Acquisition, Tracking, and Pointing VIII CY APR 05-08, 1994 CL ORLANDO, FL SP SOC PHOTO OPT INSTRUMENTAT ENGINEERS C1 JET PROP LAB,PASADENA,CA 91109. 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 0-8194-1525-1 J9 P SOC PHOTO-OPT INS PY 1994 VL 2221 BP 248 EP 259 DI 10.1117/12.178937 PG 12 WC Engineering, Aerospace; Optics SC Engineering; Optics GA BA83U UT WOS:A1994BA83U00023 ER PT J AU ROSS, JL AF ROSS, JL TI EVA DESIGN - LESSONS LEARNED SO ACTA ASTRONAUTICA LA English DT Article; Proceedings Paper CT 9th IAA Man-in-Space Symposium CY JUN 17-21, 1991 CL COLOGNE, GERMANY SP INT ACAD ASTRONAUT AB Extravehicular Activities (EVAs) are very demanding and specialized space flight activities. There are many aspects to consider in the design of hardware, tools, and procedures to be used on an EVA mission. To help minimize costs and optimize the EVA productivity, experience shows that astronauts should become involved early in the design process. RP ROSS, JL (reprint author), NASA,LYNDON B JOHNSON SPACE CTR,HOUSTON,TX 77058, USA. NR 0 TC 5 Z9 5 U1 0 U2 0 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 JAN PY 1994 VL 32 IS 1 BP 1 EP 4 DI 10.1016/0094-5765(94)90142-2 PG 4 WC Engineering, Aerospace SC Engineering GA MR526 UT WOS:A1994MR52600002 PM 11541014 ER PT J AU MCBARRON, JW AF MCBARRON, JW TI PAST, PRESENT, AND FUTURE - THE UNITED-STATES EVA PROGRAM SO ACTA ASTRONAUTICA LA English DT Article; Proceedings Paper CT 9th IAA Man-in-Space Symposium CY JUN 17-21, 1991 CL COLOGNE, GERMANY SP INT ACAD ASTRONAUT AB This paper provides an overview and summary of U.S. extravehicular activity accomplishments of the last 26 years, Space Shuttle missions having scheduled extravehicular activities to be performed over the next several years, extravehicular activities expected to be necessary to support Space Station Freedom assembly tasks and operations, and potential extravehicular activity roles of the NASA Space Exploration Initiative Program. RP MCBARRON, JW (reprint author), NASA,LYNDON B JOHNSON SPACE CTR,HOUSTON,TX 77058, USA. NR 0 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 0094-5765 J9 ACTA ASTRONAUT JI Acta Astronaut. PD JAN PY 1994 VL 32 IS 1 BP 5 EP 14 DI 10.1016/0094-5765(94)90143-0 PG 10 WC Engineering, Aerospace SC Engineering GA MR526 UT WOS:A1994MR52600003 ER PT J AU HUDKINS, K AF HUDKINS, K TI INTRODUCTION AND OVERVIEW OF THE PROBLEM SO ACTA ASTRONAUTICA LA English DT Article; Proceedings Paper CT 9th IAA Man-in-Space Symposium CY JUN 17-21, 1991 CL COLOGNE, GERMANY SP INT ACAD ASTRONAUT RP HUDKINS, K (reprint author), NASA,OFF SPACE FLIGHT,WASHINGTON,DC 20546, USA. 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 0094-5765 J9 ACTA ASTRONAUT JI Acta Astronaut. PD JAN PY 1994 VL 32 IS 1 BP 71 EP 71 DI 10.1016/0094-5765(94)90150-3 PG 1 WC Engineering, Aerospace SC Engineering GA MR526 UT WOS:A1994MR52600009 PM 11541022 ER PT J AU MCBARRON, JW AF MCBARRON, JW TI UNITED-STATES PREBREATHE PROTOCOL SO ACTA ASTRONAUTICA LA English DT Article; Proceedings Paper CT 9th IAA Man-in-Space Symposium CY JUN 17-21, 1991 CL COLOGNE, GERMANY SP INT ACAD ASTRONAUT AB This paper identifies and describes the prebreathe protocol currently used by the U.S. Space Shuttle Program to provide astronauts the capability to safely perform extravehicular activity. A comparison of planned vs actual prebreathe experience through the STS-37 Mission is also provided. RP MCBARRON, JW (reprint author), NASA,LYNDON B JOHNSON SPACE CTR,HOUSTON,TX 77058, USA. NR 0 TC 10 Z9 10 U1 0 U2 1 PU PERGAMON-ELSEVIER SCIENCE LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0094-5765 J9 ACTA ASTRONAUT JI Acta Astronaut. PD JAN PY 1994 VL 32 IS 1 BP 75 EP 78 DI 10.1016/0094-5765(94)90152-X PG 4 WC Engineering, Aerospace SC Engineering GA MR526 UT WOS:A1994MR52600011 ER PT J AU KICZA, M BRUEGGE, RV AF KICZA, M BRUEGGE, RV BE Marec, JP Chernyi, GG Grey, J Saito, S TI NASAS DISCOVERY PROGRAM SO ACTA ASTRONAUTICA, VOL 35, SUPPLEMENT, 1995: PROCEEDINGS OF THE IAA INTERNATIONAL CONFERENCE ON LOW-COST PLANETARY MISSIONS LA English DT Proceedings Paper CT IAA International Conference on Low-Cost Planetary Missions CY APR 12-15, 1994 CL JOHNS HOPKINS UNIV, APPL PHYS LAB, LAUREL, MD SP INT ACAD ASTRONAUT, AMER ASTRONAUT SOC, NASA, EUROPEAN SPACE ADM, CTR NATL ETUDES SPATIALES, DEUT AGENTUR RAUMFAHRTANGELEGENHEITEN, INST SPACE & ASTRONAUT SCI, SPACE RES INST, AEROSPATIALE ESPACE & DEF, ALCATEL ESPACE, MARTIN MARIETTA CORP, MCDONNELL DOUGLAS AEROSP HO JOHNS HOPKINS UNIV, APPL PHYS LAB C1 NASA,DIV SOLAR SYST EXPLORAT,WASHINGTON,DC 20546. NR 0 TC 0 Z9 0 U1 0 U2 0 PU PERGAMON PRESS LTD PI OXFORD PA THE BOULEVARD LANGFORD LANE KIDLINGTON, OXFORD, ENGLAND OX5 1GB PY 1994 BP 41 EP 50 PG 10 WC Engineering, Aerospace SC Engineering GA BD05J UT WOS:A1994BD05J00004 ER PT J AU LANE, AL AF LANE, AL BE Marec, JP Chernyi, GG Grey, J Saito, S TI THE MARS-94 OXIDANT EXPERIMENT (MOX) - CREATION OF SOMETHING FROM NOTHING IN 1 YEAR SO ACTA ASTRONAUTICA, VOL 35, SUPPLEMENT, 1995: PROCEEDINGS OF THE IAA INTERNATIONAL CONFERENCE ON LOW-COST PLANETARY MISSIONS LA English DT Proceedings Paper CT IAA International Conference on Low-Cost Planetary Missions CY APR 12-15, 1994 CL JOHNS HOPKINS UNIV, APPL PHYS LAB, LAUREL, MD SP INT ACAD ASTRONAUT, AMER ASTRONAUT SOC, NASA, EUROPEAN SPACE ADM, CTR NATL ETUDES SPATIALES, DEUT AGENTUR RAUMFAHRTANGELEGENHEITEN, INST SPACE & ASTRONAUT SCI, SPACE RES INST, AEROSPATIALE ESPACE & DEF, ALCATEL ESPACE, MARTIN MARIETTA CORP, MCDONNELL DOUGLAS AEROSP HO JOHNS HOPKINS UNIV, APPL PHYS LAB C1 JET PROP LAB,PASADENA,CA 91109. NR 0 TC 1 Z9 1 U1 0 U2 0 PU PERGAMON PRESS LTD PI OXFORD PA THE BOULEVARD LANGFORD LANE KIDLINGTON, OXFORD, ENGLAND OX5 1GB PY 1994 BP 69 EP 78 PG 10 WC Engineering, Aerospace SC Engineering GA BD05J UT WOS:A1994BD05J00007 ER PT J AU BEAUCHAMP, PM BROWN, RH BRUCE, CF CHEN, GS CHRISP, MP FRASCHETTI, GA KRABACH, TN PETRICK, SW RODGERS, DH RODRIGUEZ, J SOLL, SL VAUGHAN, AH AF BEAUCHAMP, PM BROWN, RH BRUCE, CF CHEN, GS CHRISP, MP FRASCHETTI, GA KRABACH, TN PETRICK, SW RODGERS, DH RODRIGUEZ, J SOLL, SL VAUGHAN, AH BE Marec, JP Chernyi, GG Grey, J Saito, S TI PLUTO INTEGRATED CAMERA SPECTROMETER (PICS) INSTRUMENT SO ACTA ASTRONAUTICA, VOL 35, SUPPLEMENT, 1995: PROCEEDINGS OF THE IAA INTERNATIONAL CONFERENCE ON LOW-COST PLANETARY MISSIONS LA English DT Proceedings Paper CT IAA International Conference on Low-Cost Planetary Missions CY APR 12-15, 1994 CL JOHNS HOPKINS UNIV, APPL PHYS LAB, LAUREL, MD SP INT ACAD ASTRONAUT, AMER ASTRONAUT SOC, NASA, EUROPEAN SPACE ADM, CTR NATL ETUDES SPATIALES, DEUT AGENTUR RAUMFAHRTANGELEGENHEITEN, INST SPACE & ASTRONAUT SCI, SPACE RES INST, AEROSPATIALE ESPACE & DEF, ALCATEL ESPACE, MARTIN MARIETTA CORP, MCDONNELL DOUGLAS AEROSP HO JOHNS HOPKINS UNIV, APPL PHYS LAB C1 JET PROP LAB,PASADENA,CA 91109. NR 0 TC 0 Z9 0 U1 0 U2 0 PU PERGAMON PRESS LTD PI OXFORD PA THE BOULEVARD LANGFORD LANE KIDLINGTON, OXFORD, ENGLAND OX5 1GB PY 1994 BP 99 EP 108 PG 10 WC Engineering, Aerospace SC Engineering GA BD05J UT WOS:A1994BD05J00010 ER PT B AU BRADLEY, JG SCHWEITZER, JS TRUAX, JA RICE, A TOMBRELLO, TA AF BRADLEY, JG SCHWEITZER, JS TRUAX, JA RICE, A TOMBRELLO, TA BE Marec, JP Chernyi, GG Grey, J Saito, S TI A NEUTRON ACTIVATION GAMMA RAY SPECTROMETER FOR PLANETARY SURFACE ANALYSIS SO ACTA ASTRONAUTICA, VOL 35, SUPPLEMENT, 1995: PROCEEDINGS OF THE IAA INTERNATIONAL CONFERENCE ON LOW-COST PLANETARY MISSIONS LA English DT Proceedings Paper CT IAA International Conference on Low-Cost Planetary Missions CY APR 12-15, 1994 CL JOHNS HOPKINS UNIV, APPL PHYS LAB, LAUREL, MD SP INT ACAD ASTRONAUT, AMER ASTRONAUT SOC, NASA, EUROPEAN SPACE ADM, CTR NATL ETUDES SPATIALES, DEUT AGENTUR RAUMFAHRTANGELEGENHEITEN, INST SPACE & ASTRONAUT SCI, SPACE RES INST, AEROSPATIALE ESPACE & DEF, ALCATEL ESPACE, MARTIN MARIETTA CORP, MCDONNELL DOUGLAS AEROSP HO JOHNS HOPKINS UNIV, APPL PHYS LAB C1 JET PROP LAB,PASADENA,CA 91109. NR 0 TC 0 Z9 0 U1 0 U2 3 PU PERGAMON PRESS LTD PI OXFORD PA THE BOULEVARD LANGFORD LANE KIDLINGTON, OXFORD, ENGLAND OX5 1GB PY 1994 BP 109 EP 118 PG 10 WC Engineering, Aerospace SC Engineering GA BD05J UT WOS:A1994BD05J00011 ER PT J AU SCHEERES, DJ WILLIAMS, BG BOLLMAN, WE DAVIS, RP HELFRICH, CE SYNNOTT, SP YEOMANS, DK AF SCHEERES, DJ WILLIAMS, BG BOLLMAN, WE DAVIS, RP HELFRICH, CE SYNNOTT, SP YEOMANS, DK BE Marec, JP Chernyi, GG Grey, J Saito, S TI NAVIGATION FOR LOW-COST MISSIONS TO SMALL SOLAR-SYSTEM BODIES SO ACTA ASTRONAUTICA, VOL 35, SUPPLEMENT, 1995: PROCEEDINGS OF THE IAA INTERNATIONAL CONFERENCE ON LOW-COST PLANETARY MISSIONS LA English DT Proceedings Paper CT IAA International Conference on Low-Cost Planetary Missions CY APR 12-15, 1994 CL JOHNS HOPKINS UNIV, APPL PHYS LAB, LAUREL, MD SP INT ACAD ASTRONAUT, AMER ASTRONAUT SOC, NASA, EUROPEAN SPACE ADM, CTR NATL ETUDES SPATIALES, DEUT AGENTUR RAUMFAHRTANGELEGENHEITEN, INST SPACE & ASTRONAUT SCI, SPACE RES INST, AEROSPATIALE ESPACE & DEF, ALCATEL ESPACE, MARTIN MARIETTA CORP, MCDONNELL DOUGLAS AEROSP HO JOHNS HOPKINS UNIV, APPL PHYS LAB C1 JET PROP LAB,PASADENA,CA 91109. NR 0 TC 0 Z9 0 U1 0 U2 0 PU PERGAMON PRESS LTD PI OXFORD PA THE BOULEVARD LANGFORD LANE KIDLINGTON, OXFORD, ENGLAND OX5 1GB PY 1994 BP 211 EP 220 PG 10 WC Engineering, Aerospace SC Engineering GA BD05J UT WOS:A1994BD05J00022 ER PT J AU KERRIDGE, S EVANS, M TSURUTANI, B AF KERRIDGE, S EVANS, M TSURUTANI, B BE Marec, JP Chernyi, GG Grey, J Saito, S TI COST-EFFECTIVE MISSION DESIGN FOR A SMALL SOLAR PROBE SO ACTA ASTRONAUTICA, VOL 35, SUPPLEMENT, 1995: PROCEEDINGS OF THE IAA INTERNATIONAL CONFERENCE ON LOW-COST PLANETARY MISSIONS LA English DT Proceedings Paper CT IAA International Conference on Low-Cost Planetary Missions CY APR 12-15, 1994 CL JOHNS HOPKINS UNIV, APPL PHYS LAB, LAUREL, MD SP INT ACAD ASTRONAUT, AMER ASTRONAUT SOC, NASA, EUROPEAN SPACE ADM, CTR NATL ETUDES SPATIALES, DEUT AGENTUR RAUMFAHRTANGELEGENHEITEN, INST SPACE & ASTRONAUT SCI, SPACE RES INST, AEROSPATIALE ESPACE & DEF, ALCATEL ESPACE, MARTIN MARIETTA CORP, MCDONNELL DOUGLAS AEROSP HO JOHNS HOPKINS UNIV, APPL PHYS LAB C1 JET PROP LAB,PASADENA,CA 91109. NR 0 TC 0 Z9 0 U1 0 U2 0 PU PERGAMON PRESS LTD PI OXFORD PA THE BOULEVARD LANGFORD LANE KIDLINGTON, OXFORD, ENGLAND OX5 1GB PY 1994 BP 257 EP 266 PG 10 WC Engineering, Aerospace SC Engineering GA BD05J UT WOS:A1994BD05J00027 ER PT J AU WALLACE, RA AYON, JA LANE, AL NUNEZ, CL SAUER, CG STETSON, DS WEST, RA STERN, SA AF WALLACE, RA AYON, JA LANE, AL NUNEZ, CL SAUER, CG STETSON, DS WEST, RA STERN, SA BE Marec, JP Chernyi, GG Grey, J Saito, S TI MEASURE-JUPITER - LOW-COST MISSIONS TO EXPLORE JUPITER IN THE POST-GALILEO ERA SO ACTA ASTRONAUTICA, VOL 35, SUPPLEMENT, 1995: PROCEEDINGS OF THE IAA INTERNATIONAL CONFERENCE ON LOW-COST PLANETARY MISSIONS LA English DT Proceedings Paper CT IAA International Conference on Low-Cost Planetary Missions CY APR 12-15, 1994 CL JOHNS HOPKINS UNIV, APPL PHYS LAB, LAUREL, MD SP INT ACAD ASTRONAUT, AMER ASTRONAUT SOC, NASA, EUROPEAN SPACE ADM, CTR NATL ETUDES SPATIALES, DEUT AGENTUR RAUMFAHRTANGELEGENHEITEN, INST SPACE & ASTRONAUT SCI, SPACE RES INST, AEROSPATIALE ESPACE & DEF, ALCATEL ESPACE, MARTIN MARIETTA CORP, MCDONNELL DOUGLAS AEROSP HO JOHNS HOPKINS UNIV, APPL PHYS LAB C1 JET PROP LAB,TECH STAFF,PASADENA,CA 91109. NR 0 TC 0 Z9 0 U1 0 U2 0 PU PERGAMON PRESS LTD PI OXFORD PA THE BOULEVARD LANGFORD LANE KIDLINGTON, OXFORD, ENGLAND OX5 1GB PY 1994 BP 277 EP 286 PG 10 WC Engineering, Aerospace SC Engineering GA BD05J UT WOS:A1994BD05J00029 ER PT J AU SPEAR, AJ AF SPEAR, AJ BE Marec, JP Chernyi, GG Grey, J Saito, S TI LOW COST APPROACH TO MARS PATHFINDER AND SMALL LANDERS SO ACTA ASTRONAUTICA, VOL 35, SUPPLEMENT, 1995: PROCEEDINGS OF THE IAA INTERNATIONAL CONFERENCE ON LOW-COST PLANETARY MISSIONS LA English DT Proceedings Paper CT IAA International Conference on Low-Cost Planetary Missions CY APR 12-15, 1994 CL JOHNS HOPKINS UNIV, APPL PHYS LAB, LAUREL, MD SP INT ACAD ASTRONAUT, AMER ASTRONAUT SOC, NASA, EUROPEAN SPACE ADM, CTR NATL ETUDES SPATIALES, DEUT AGENTUR RAUMFAHRTANGELEGENHEITEN, INST SPACE & ASTRONAUT SCI, SPACE RES INST, AEROSPATIALE ESPACE & DEF, ALCATEL ESPACE, MARTIN MARIETTA CORP, MCDONNELL DOUGLAS AEROSP HO JOHNS HOPKINS UNIV, APPL PHYS LAB C1 JET PROP LAB,PASADENA,CA 91109. NR 0 TC 0 Z9 0 U1 0 U2 0 PU PERGAMON PRESS LTD PI OXFORD PA THE BOULEVARD LANGFORD LANE KIDLINGTON, OXFORD, ENGLAND OX5 1GB PY 1994 BP 345 EP 354 PG 10 WC Engineering, Aerospace SC Engineering GA BD05J UT WOS:A1994BD05J00036 ER PT J AU SHIRLEY, DL AF SHIRLEY, DL BE Marec, JP Chernyi, GG Grey, J Saito, S TI MARS PATHFINDER MICROROVER FLIGHT EXPERIMENT - A PARADIGM FOR VERY LOW-COST SPACECRAFT SO ACTA ASTRONAUTICA, VOL 35, SUPPLEMENT, 1995: PROCEEDINGS OF THE IAA INTERNATIONAL CONFERENCE ON LOW-COST PLANETARY MISSIONS LA English DT Proceedings Paper CT IAA International Conference on Low-Cost Planetary Missions CY APR 12-15, 1994 CL JOHNS HOPKINS UNIV, APPL PHYS LAB, LAUREL, MD SP INT ACAD ASTRONAUT, AMER ASTRONAUT SOC, NASA, EUROPEAN SPACE ADM, CTR NATL ETUDES SPATIALES, DEUT AGENTUR RAUMFAHRTANGELEGENHEITEN, INST SPACE & ASTRONAUT SCI, SPACE RES INST, AEROSPATIALE ESPACE & DEF, ALCATEL ESPACE, MARTIN MARIETTA CORP, MCDONNELL DOUGLAS AEROSP HO JOHNS HOPKINS UNIV, APPL PHYS LAB C1 JET PROP LAB,PASADENA,CA 91109. NR 0 TC 0 Z9 0 U1 0 U2 0 PU PERGAMON PRESS LTD PI OXFORD PA THE BOULEVARD LANGFORD LANE KIDLINGTON, OXFORD, ENGLAND OX5 1GB PY 1994 BP 355 EP 365 PG 11 WC Engineering, Aerospace SC Engineering GA BD05J UT WOS:A1994BD05J00037 ER PT J AU HASTRUP, R CESARONE, R MILLER, A MCOMBER, R AF HASTRUP, R CESARONE, R MILLER, A MCOMBER, R BE Marec, JP Chernyi, GG Grey, J Saito, S TI MARS RELAY SATELLITE - KEY TO ENABLING & ENHANCING LOW COST EXPLORATION MISSIONS SO ACTA ASTRONAUTICA, VOL 35, SUPPLEMENT, 1995: PROCEEDINGS OF THE IAA INTERNATIONAL CONFERENCE ON LOW-COST PLANETARY MISSIONS LA English DT Proceedings Paper CT IAA International Conference on Low-Cost Planetary Missions CY APR 12-15, 1994 CL JOHNS HOPKINS UNIV, APPL PHYS LAB, LAUREL, MD SP INT ACAD ASTRONAUT, AMER ASTRONAUT SOC, NASA, EUROPEAN SPACE ADM, CTR NATL ETUDES SPATIALES, DEUT AGENTUR RAUMFAHRTANGELEGENHEITEN, INST SPACE & ASTRONAUT SCI, SPACE RES INST, AEROSPATIALE ESPACE & DEF, ALCATEL ESPACE, MARTIN MARIETTA CORP, MCDONNELL DOUGLAS AEROSP HO JOHNS HOPKINS UNIV, APPL PHYS LAB C1 JET PROP LAB,MISSION DESIGN SECT,PASADENA,CA 91109. NR 0 TC 0 Z9 0 U1 0 U2 0 PU PERGAMON PRESS LTD PI OXFORD PA THE BOULEVARD LANGFORD LANE KIDLINGTON, OXFORD, ENGLAND OX5 1GB PY 1994 BP 367 EP 376 PG 10 WC Engineering, Aerospace SC Engineering GA BD05J UT WOS:A1994BD05J00038 ER PT J AU NELSON, RM HORN, LJ WEISS, JR SMYTHE, WD AF NELSON, RM HORN, LJ WEISS, JR SMYTHE, WD BE Marec, JP Chernyi, GG Grey, J Saito, S TI HERMES GLOBAL ORBITER - A DISCOVERY MISSION IN GESTATION SO ACTA ASTRONAUTICA, VOL 35, SUPPLEMENT, 1995: PROCEEDINGS OF THE IAA INTERNATIONAL CONFERENCE ON LOW-COST PLANETARY MISSIONS LA English DT Proceedings Paper CT IAA International Conference on Low-Cost Planetary Missions CY APR 12-15, 1994 CL JOHNS HOPKINS UNIV, APPL PHYS LAB, LAUREL, MD SP INT ACAD ASTRONAUT, AMER ASTRONAUT SOC, NASA, EUROPEAN SPACE ADM, CTR NATL ETUDES SPATIALES, DEUT AGENTUR RAUMFAHRTANGELEGENHEITEN, INST SPACE & ASTRONAUT SCI, SPACE RES INST, AEROSPATIALE ESPACE & DEF, ALCATEL ESPACE, MARTIN MARIETTA CORP, MCDONNELL DOUGLAS AEROSP HO JOHNS HOPKINS UNIV, APPL PHYS LAB C1 JET PROP LAB,PASADENA,CA 91109. NR 0 TC 0 Z9 0 U1 0 U2 0 PU PERGAMON PRESS LTD PI OXFORD PA THE BOULEVARD LANGFORD LANE KIDLINGTON, OXFORD, ENGLAND OX5 1GB PY 1994 BP 387 EP 395 PG 9 WC Engineering, Aerospace SC Engineering GA BD05J UT WOS:A1994BD05J00040 ER PT B AU CRISP, D KAISER, WJ HOENK, ME AF CRISP, D KAISER, WJ HOENK, ME BE Marec, JP Chernyi, GG Grey, J Saito, S TI MICRO-WEATHER-STATIONS FOR MARS SO ACTA ASTRONAUTICA, VOL 35, SUPPLEMENT, 1995: PROCEEDINGS OF THE IAA INTERNATIONAL CONFERENCE ON LOW-COST PLANETARY MISSIONS LA English DT Proceedings Paper CT IAA International Conference on Low-Cost Planetary Missions CY APR 12-15, 1994 CL JOHNS HOPKINS UNIV, APPL PHYS LAB, LAUREL, MD SP INT ACAD ASTRONAUT, AMER ASTRONAUT SOC, NASA, EUROPEAN SPACE ADM, CTR NATL ETUDES SPATIALES, DEUT AGENTUR RAUMFAHRTANGELEGENHEITEN, INST SPACE & ASTRONAUT SCI, SPACE RES INST, AEROSPATIALE ESPACE & DEF, ALCATEL ESPACE, MARTIN MARIETTA CORP, MCDONNELL DOUGLAS AEROSP HO JOHNS HOPKINS UNIV, APPL PHYS LAB C1 JET PROP LAB,PASADENA,CA 91109. NR 0 TC 0 Z9 0 U1 0 U2 1 PU PERGAMON PRESS LTD PI OXFORD PA THE BOULEVARD LANGFORD LANE KIDLINGTON, OXFORD, ENGLAND OX5 1GB PY 1994 BP 407 EP 415 PG 9 WC Engineering, Aerospace SC Engineering GA BD05J UT WOS:A1994BD05J00042 ER PT J AU BAINES, KH CARLSON, RW CRISP, D SCHOFIELD, JT BEZARD, B DEBERGH, C DROSSART, P DELAMAERE, WA FEGLEY, B SMITH, WH LIMAYE, SJ RUSSELL, CT SCHUBERT, G CALCUTT, S TAYLOR, FW AF BAINES, KH CARLSON, RW CRISP, D SCHOFIELD, JT BEZARD, B DEBERGH, C DROSSART, P DELAMAERE, WA FEGLEY, B SMITH, WH LIMAYE, SJ RUSSELL, CT SCHUBERT, G CALCUTT, S TAYLOR, FW BE Marec, JP Chernyi, GG Grey, J Saito, S TI VESAT - THE VENUS ENVIRONMENTAL SATELLITE DISCOVERY MISSION SO ACTA ASTRONAUTICA, VOL 35, SUPPLEMENT, 1995: PROCEEDINGS OF THE IAA INTERNATIONAL CONFERENCE ON LOW-COST PLANETARY MISSIONS LA English DT Proceedings Paper CT IAA International Conference on Low-Cost Planetary Missions CY APR 12-15, 1994 CL JOHNS HOPKINS UNIV, APPL PHYS LAB, LAUREL, MD SP INT ACAD ASTRONAUT, AMER ASTRONAUT SOC, NASA, EUROPEAN SPACE ADM, CTR NATL ETUDES SPATIALES, DEUT AGENTUR RAUMFAHRTANGELEGENHEITEN, INST SPACE & ASTRONAUT SCI, SPACE RES INST, AEROSPATIALE ESPACE & DEF, ALCATEL ESPACE, MARTIN MARIETTA CORP, MCDONNELL DOUGLAS AEROSP HO JOHNS HOPKINS UNIV, APPL PHYS LAB C1 JET PROP LAB,PASADENA,CA 91109. NR 0 TC 0 Z9 0 U1 0 U2 0 PU PERGAMON PRESS LTD PI OXFORD PA THE BOULEVARD LANGFORD LANE KIDLINGTON, OXFORD, ENGLAND OX5 1GB PY 1994 BP 417 EP 426 PG 10 WC Engineering, Aerospace SC Engineering GA BD05J UT WOS:A1994BD05J00043 ER PT J AU GUSTAVSON, RP PAGE, DN MILLER, LJ AF GUSTAVSON, RP PAGE, DN MILLER, LJ BE Marec, JP Chernyi, GG Grey, J Saito, S TI LOW COST UPLINK CONCEPTS SO ACTA ASTRONAUTICA, VOL 35, SUPPLEMENT, 1995: PROCEEDINGS OF THE IAA INTERNATIONAL CONFERENCE ON LOW-COST PLANETARY MISSIONS LA English DT Proceedings Paper CT IAA International Conference on Low-Cost Planetary Missions CY APR 12-15, 1994 CL JOHNS HOPKINS UNIV, APPL PHYS LAB, LAUREL, MD SP INT ACAD ASTRONAUT, AMER ASTRONAUT SOC, NASA, EUROPEAN SPACE ADM, CTR NATL ETUDES SPATIALES, DEUT AGENTUR RAUMFAHRTANGELEGENHEITEN, INST SPACE & ASTRONAUT SCI, SPACE RES INST, AEROSPATIALE ESPACE & DEF, ALCATEL ESPACE, MARTIN MARIETTA CORP, MCDONNELL DOUGLAS AEROSP HO JOHNS HOPKINS UNIV, APPL PHYS LAB C1 JET PROP LAB,PASADENA,CA 91109. NR 0 TC 0 Z9 0 U1 0 U2 0 PU PERGAMON PRESS LTD PI OXFORD PA THE BOULEVARD LANGFORD LANE KIDLINGTON, OXFORD, ENGLAND OX5 1GB PY 1994 BP 455 EP 464 PG 10 WC Engineering, Aerospace SC Engineering GA BD05J UT WOS:A1994BD05J00047 ER PT J AU LEDBETTER, KW AF LEDBETTER, KW BE Marec, JP Chernyi, GG Grey, J Saito, S TI MISSION OPERATIONS COSTS FOR SCIENTIFIC SPACECRAFT - THE REVOLUTION THAT IS NEEDED SO ACTA ASTRONAUTICA, VOL 35, SUPPLEMENT, 1995: PROCEEDINGS OF THE IAA INTERNATIONAL CONFERENCE ON LOW-COST PLANETARY MISSIONS LA English DT Proceedings Paper CT IAA International Conference on Low-Cost Planetary Missions CY APR 12-15, 1994 CL JOHNS HOPKINS UNIV, APPL PHYS LAB, LAUREL, MD SP INT ACAD ASTRONAUT, AMER ASTRONAUT SOC, NASA, EUROPEAN SPACE ADM, CTR NATL ETUDES SPATIALES, DEUT AGENTUR RAUMFAHRTANGELEGENHEITEN, INST SPACE & ASTRONAUT SCI, SPACE RES INST, AEROSPATIALE ESPACE & DEF, ALCATEL ESPACE, MARTIN MARIETTA CORP, MCDONNELL DOUGLAS AEROSP HO JOHNS HOPKINS UNIV, APPL PHYS LAB C1 NASA,DIV ASTROPHYS,WASHINGTON,DC 20546. NR 0 TC 0 Z9 0 U1 0 U2 0 PU PERGAMON PRESS LTD PI OXFORD PA THE BOULEVARD LANGFORD LANE KIDLINGTON, OXFORD, ENGLAND OX5 1GB PY 1994 BP 465 EP 473 PG 9 WC Engineering, Aerospace SC Engineering GA BD05J UT WOS:A1994BD05J00048 ER PT J AU DOODY, DF AF DOODY, DF BE Marec, JP Chernyi, GG Grey, J Saito, S TI AEROBRAKING THE MAGELLAN SPACECRAFT IN VENUS ORBIT SO ACTA ASTRONAUTICA, VOL 35, SUPPLEMENT, 1995: PROCEEDINGS OF THE IAA INTERNATIONAL CONFERENCE ON LOW-COST PLANETARY MISSIONS LA English DT Proceedings Paper CT IAA International Conference on Low-Cost Planetary Missions CY APR 12-15, 1994 CL JOHNS HOPKINS UNIV, APPL PHYS LAB, LAUREL, MD SP INT ACAD ASTRONAUT, AMER ASTRONAUT SOC, NASA, EUROPEAN SPACE ADM, CTR NATL ETUDES SPATIALES, DEUT AGENTUR RAUMFAHRTANGELEGENHEITEN, INST SPACE & ASTRONAUT SCI, SPACE RES INST, AEROSPATIALE ESPACE & DEF, ALCATEL ESPACE, MARTIN MARIETTA CORP, MCDONNELL DOUGLAS AEROSP HO JOHNS HOPKINS UNIV, APPL PHYS LAB C1 JET PROP LAB,SPACE FLIGHT OPERAT SECT,PASADENA,CA 91109. NR 0 TC 0 Z9 0 U1 1 U2 1 PU PERGAMON PRESS LTD PI OXFORD PA THE BOULEVARD LANGFORD LANE KIDLINGTON, OXFORD, ENGLAND OX5 1GB PY 1994 BP 475 EP 480 PG 6 WC Engineering, Aerospace SC Engineering GA BD05J UT WOS:A1994BD05J00049 ER PT J AU ERICKSON, KD HAMMER, FJ KAHN, PB KAZZ, GJ AF ERICKSON, KD HAMMER, FJ KAHN, PB KAZZ, GJ BE Marec, JP Chernyi, GG Grey, J Saito, S TI MISSION OPERATIONS FOR MAS OBSERVER - A CASE STUDY SO ACTA ASTRONAUTICA, VOL 35, SUPPLEMENT, 1995: PROCEEDINGS OF THE IAA INTERNATIONAL CONFERENCE ON LOW-COST PLANETARY MISSIONS LA English DT Proceedings Paper CT IAA International Conference on Low-Cost Planetary Missions CY APR 12-15, 1994 CL JOHNS HOPKINS UNIV, APPL PHYS LAB, LAUREL, MD SP INT ACAD ASTRONAUT, AMER ASTRONAUT SOC, NASA, EUROPEAN SPACE ADM, CTR NATL ETUDES SPATIALES, DEUT AGENTUR RAUMFAHRTANGELEGENHEITEN, INST SPACE & ASTRONAUT SCI, SPACE RES INST, AEROSPATIALE ESPACE & DEF, ALCATEL ESPACE, MARTIN MARIETTA CORP, MCDONNELL DOUGLAS AEROSP HO JOHNS HOPKINS UNIV, APPL PHYS LAB C1 JET PROP LAB,PASADENA,CA 91109. NR 0 TC 0 Z9 0 U1 0 U2 0 PU PERGAMON PRESS LTD PI OXFORD PA THE BOULEVARD LANGFORD LANE KIDLINGTON, OXFORD, ENGLAND OX5 1GB PY 1994 BP 481 EP 492 PG 12 WC Engineering, Aerospace SC Engineering GA BD05J UT WOS:A1994BD05J00050 ER PT J AU COFFIN, RC AF COFFIN, RC BE Marec, JP Chernyi, GG Grey, J Saito, S TI DISCOVERY PLANETARY MISSION OPERATIONS CONCEPTS SO ACTA ASTRONAUTICA, VOL 35, SUPPLEMENT, 1995: PROCEEDINGS OF THE IAA INTERNATIONAL CONFERENCE ON LOW-COST PLANETARY MISSIONS LA English DT Proceedings Paper CT IAA International Conference on Low-Cost Planetary Missions CY APR 12-15, 1994 CL JOHNS HOPKINS UNIV, APPL PHYS LAB, LAUREL, MD SP INT ACAD ASTRONAUT, AMER ASTRONAUT SOC, NASA, EUROPEAN SPACE ADM, CTR NATL ETUDES SPATIALES, DEUT AGENTUR RAUMFAHRTANGELEGENHEITEN, INST SPACE & ASTRONAUT SCI, SPACE RES INST, AEROSPATIALE ESPACE & DEF, ALCATEL ESPACE, MARTIN MARIETTA CORP, MCDONNELL DOUGLAS AEROSP HO JOHNS HOPKINS UNIV, APPL PHYS LAB C1 JET PROP LAB,PASADENA,CA 91109. NR 0 TC 0 Z9 0 U1 0 U2 0 PU PERGAMON PRESS LTD PI OXFORD PA THE BOULEVARD LANGFORD LANE KIDLINGTON, OXFORD, ENGLAND OX5 1GB PY 1994 BP 493 EP 500 PG 8 WC Engineering, Aerospace SC Engineering GA BD05J UT WOS:A1994BD05J00051 ER PT J AU BRYANT, L AF BRYANT, L BE Marec, JP Chernyi, GG Grey, J Saito, S TI A MOS FOR ALL SEASONS SO ACTA ASTRONAUTICA, VOL 35, SUPPLEMENT, 1995: PROCEEDINGS OF THE IAA INTERNATIONAL CONFERENCE ON LOW-COST PLANETARY MISSIONS LA English DT Proceedings Paper CT IAA International Conference on Low-Cost Planetary Missions CY APR 12-15, 1994 CL JOHNS HOPKINS UNIV, APPL PHYS LAB, LAUREL, MD SP INT ACAD ASTRONAUT, AMER ASTRONAUT SOC, NASA, EUROPEAN SPACE ADM, CTR NATL ETUDES SPATIALES, DEUT AGENTUR RAUMFAHRTANGELEGENHEITEN, INST SPACE & ASTRONAUT SCI, SPACE RES INST, AEROSPATIALE ESPACE & DEF, ALCATEL ESPACE, MARTIN MARIETTA CORP, MCDONNELL DOUGLAS AEROSP HO JOHNS HOPKINS UNIV, APPL PHYS LAB DE MISSION OPERATIONS SYSTEM; OPERATIONS; CUSTOMER FOCUS; PERFORMANCE SUPPORT C1 JET PROP LAB,OPERAT SYST TRAINING GRP,PASADENA,CA 91109. NR 0 TC 0 Z9 0 U1 0 U2 0 PU PERGAMON PRESS LTD PI OXFORD PA THE BOULEVARD LANGFORD LANE KIDLINGTON, OXFORD, ENGLAND OX5 1GB PY 1994 BP 525 EP 533 PG 9 WC Engineering, Aerospace SC Engineering GA BD05J UT WOS:A1994BD05J00055 ER PT J AU HORVATH, JC ALKALAJ, LJ SCHNEIDER, KM SPITALE, JM LE, D AF HORVATH, JC ALKALAJ, LJ SCHNEIDER, KM SPITALE, JM LE, D BE Marec, JP Chernyi, GG Grey, J Saito, S TI AUTOMATED CONSTRAINT CHECKING OF SPACECRAFT COMMAND SEQUENCES SO ACTA ASTRONAUTICA, VOL 35, SUPPLEMENT, 1995: PROCEEDINGS OF THE IAA INTERNATIONAL CONFERENCE ON LOW-COST PLANETARY MISSIONS LA English DT Proceedings Paper CT IAA International Conference on Low-Cost Planetary Missions CY APR 12-15, 1994 CL JOHNS HOPKINS UNIV, APPL PHYS LAB, LAUREL, MD SP INT ACAD ASTRONAUT, AMER ASTRONAUT SOC, NASA, EUROPEAN SPACE ADM, CTR NATL ETUDES SPATIALES, DEUT AGENTUR RAUMFAHRTANGELEGENHEITEN, INST SPACE & ASTRONAUT SCI, SPACE RES INST, AEROSPATIALE ESPACE & DEF, ALCATEL ESPACE, MARTIN MARIETTA CORP, MCDONNELL DOUGLAS AEROSP HO JOHNS HOPKINS UNIV, APPL PHYS LAB C1 JET PROP LAB,PASADENA,CA 91109. NR 0 TC 0 Z9 0 U1 0 U2 0 PU PERGAMON PRESS LTD PI OXFORD PA THE BOULEVARD LANGFORD LANE KIDLINGTON, OXFORD, ENGLAND OX5 1GB PY 1994 BP 535 EP 544 PG 10 WC Engineering, Aerospace SC Engineering GA BD05J UT WOS:A1994BD05J00056 ER PT J AU THURMAN, SW POLLMEIER, VM AF THURMAN, SW POLLMEIER, VM BE Marec, JP Chernyi, GG Grey, J Saito, S TI GUIDANCE AND NAVIGATION FOR THE MARS PATHFINDER MISSION SO ACTA ASTRONAUTICA, VOL 35, SUPPLEMENT, 1995: PROCEEDINGS OF THE IAA INTERNATIONAL CONFERENCE ON LOW-COST PLANETARY MISSIONS LA English DT Proceedings Paper CT IAA International Conference on Low-Cost Planetary Missions CY APR 12-15, 1994 CL JOHNS HOPKINS UNIV, APPL PHYS LAB, LAUREL, MD SP INT ACAD ASTRONAUT, AMER ASTRONAUT SOC, NASA, EUROPEAN SPACE ADM, CTR NATL ETUDES SPATIALES, DEUT AGENTUR RAUMFAHRTANGELEGENHEITEN, INST SPACE & ASTRONAUT SCI, SPACE RES INST, AEROSPATIALE ESPACE & DEF, ALCATEL ESPACE, MARTIN MARIETTA CORP, MCDONNELL DOUGLAS AEROSP HO JOHNS HOPKINS UNIV, APPL PHYS LAB C1 JET PROP LAB,PASADENA,CA 91109. NR 0 TC 0 Z9 0 U1 0 U2 0 PU PERGAMON PRESS LTD PI OXFORD PA THE BOULEVARD LANGFORD LANE KIDLINGTON, OXFORD, ENGLAND OX5 1GB PY 1994 BP 545 EP 554 PG 10 WC Engineering, Aerospace SC Engineering GA BD05J UT WOS:A1994BD05J00057 ER PT J AU ALJABRI, AS KIA, T LAI, JY AF ALJABRI, AS KIA, T LAI, JY BE Marec, JP Chernyi, GG Grey, J Saito, S TI HIGHLY-AUTONOMOUS EVENT-DRIVEN SPACECRAFT CONTROL SO ACTA ASTRONAUTICA, VOL 35, SUPPLEMENT, 1995: PROCEEDINGS OF THE IAA INTERNATIONAL CONFERENCE ON LOW-COST PLANETARY MISSIONS LA English DT Proceedings Paper CT IAA International Conference on Low-Cost Planetary Missions CY APR 12-15, 1994 CL JOHNS HOPKINS UNIV, APPL PHYS LAB, LAUREL, MD SP INT ACAD ASTRONAUT, AMER ASTRONAUT SOC, NASA, EUROPEAN SPACE ADM, CTR NATL ETUDES SPATIALES, DEUT AGENTUR RAUMFAHRTANGELEGENHEITEN, INST SPACE & ASTRONAUT SCI, SPACE RES INST, AEROSPATIALE ESPACE & DEF, ALCATEL ESPACE, MARTIN MARIETTA CORP, MCDONNELL DOUGLAS AEROSP HO JOHNS HOPKINS UNIV, APPL PHYS LAB C1 JET PROP LAB,PASADENA,CA 91109. NR 0 TC 0 Z9 0 U1 0 U2 0 PU PERGAMON PRESS LTD PI OXFORD PA THE BOULEVARD LANGFORD LANE KIDLINGTON, OXFORD, ENGLAND OX5 1GB PY 1994 BP 555 EP 565 PG 11 WC Engineering, Aerospace SC Engineering GA BD05J UT WOS:A1994BD05J00058 ER PT J AU SPRADLIN, GL LINICK, SH RUDD, RP HORN, LJ AF SPRADLIN, GL LINICK, SH RUDD, RP HORN, LJ BE Marec, JP Chernyi, GG Grey, J Saito, S TI THE HERMES VOYAGER MISSION OPERATIONS CONCEPT SO ACTA ASTRONAUTICA, VOL 35, SUPPLEMENT, 1995: PROCEEDINGS OF THE IAA INTERNATIONAL CONFERENCE ON LOW-COST PLANETARY MISSIONS LA English DT Proceedings Paper CT IAA International Conference on Low-Cost Planetary Missions CY APR 12-15, 1994 CL JOHNS HOPKINS UNIV, APPL PHYS LAB, LAUREL, MD SP INT ACAD ASTRONAUT, AMER ASTRONAUT SOC, NASA, EUROPEAN SPACE ADM, CTR NATL ETUDES SPATIALES, DEUT AGENTUR RAUMFAHRTANGELEGENHEITEN, INST SPACE & ASTRONAUT SCI, SPACE RES INST, AEROSPATIALE ESPACE & DEF, ALCATEL ESPACE, MARTIN MARIETTA CORP, MCDONNELL DOUGLAS AEROSP HO JOHNS HOPKINS UNIV, APPL PHYS LAB C1 JET PROP LAB,PASADENA,CA 91109. NR 0 TC 0 Z9 0 U1 0 U2 0 PU PERGAMON PRESS LTD PI OXFORD PA THE BOULEVARD LANGFORD LANE KIDLINGTON, OXFORD, ENGLAND OX5 1GB PY 1994 BP 567 EP 575 PG 9 WC Engineering, Aerospace SC Engineering GA BD05J UT WOS:A1994BD05J00059 ER PT J AU GREEN, WB SHAMES, PMB AF GREEN, WB SHAMES, PMB BE Marec, JP Chernyi, GG Grey, J Saito, S TI USE OF MULTIMISSION FACILITIES TO REDUCE THE COST OF OPERATIONS ON LOW COST PLANETARY MISSIONS - A MARS PATHFINDER EXAMPLE SO ACTA ASTRONAUTICA, VOL 35, SUPPLEMENT, 1995: PROCEEDINGS OF THE IAA INTERNATIONAL CONFERENCE ON LOW-COST PLANETARY MISSIONS LA English DT Proceedings Paper CT IAA International Conference on Low-Cost Planetary Missions CY APR 12-15, 1994 CL JOHNS HOPKINS UNIV, APPL PHYS LAB, LAUREL, MD SP INT ACAD ASTRONAUT, AMER ASTRONAUT SOC, NASA, EUROPEAN SPACE ADM, CTR NATL ETUDES SPATIALES, DEUT AGENTUR RAUMFAHRTANGELEGENHEITEN, INST SPACE & ASTRONAUT SCI, SPACE RES INST, AEROSPATIALE ESPACE & DEF, ALCATEL ESPACE, MARTIN MARIETTA CORP, MCDONNELL DOUGLAS AEROSP HO JOHNS HOPKINS UNIV, APPL PHYS LAB C1 JET PROP LAB,IMAGE PROC APPLICAT & DEV SECT,PASADENA,CA 91109. NR 0 TC 0 Z9 0 U1 0 U2 0 PU PERGAMON PRESS LTD PI OXFORD PA THE BOULEVARD LANGFORD LANE KIDLINGTON, OXFORD, ENGLAND OX5 1GB PY 1994 BP 577 EP 585 PG 9 WC Engineering, Aerospace SC Engineering GA BD05J UT WOS:A1994BD05J00060 ER PT J AU PONIATOWSKI, KS OSMOLOVSKY, MG AF PONIATOWSKI, KS OSMOLOVSKY, MG BE Marec, JP Chernyi, GG Grey, J Saito, S TI CAPABILITIES, COSTS, AND CONSTRAINTS OF SPACE TRANSPORTATION FOR PLANETARY MISSIONS SO ACTA ASTRONAUTICA, VOL 35, SUPPLEMENT, 1995: PROCEEDINGS OF THE IAA INTERNATIONAL CONFERENCE ON LOW-COST PLANETARY MISSIONS LA English DT Proceedings Paper CT IAA International Conference on Low-Cost Planetary Missions CY APR 12-15, 1994 CL JOHNS HOPKINS UNIV, APPL PHYS LAB, LAUREL, MD SP INT ACAD ASTRONAUT, AMER ASTRONAUT SOC, NASA, EUROPEAN SPACE ADM, CTR NATL ETUDES SPATIALES, DEUT AGENTUR RAUMFAHRTANGELEGENHEITEN, INST SPACE & ASTRONAUT SCI, SPACE RES INST, AEROSPATIALE ESPACE & DEF, ALCATEL ESPACE, MARTIN MARIETTA CORP, MCDONNELL DOUGLAS AEROSP HO JOHNS HOPKINS UNIV, APPL PHYS LAB C1 NASA,LAUNCH VEHICLES OFF,NEW PROGRAMS & INTEGRAT,WASHINGTON,DC 20546. NR 0 TC 0 Z9 0 U1 0 U2 0 PU PERGAMON PRESS LTD PI OXFORD PA THE BOULEVARD LANGFORD LANE KIDLINGTON, OXFORD, ENGLAND OX5 1GB PY 1994 BP 587 EP 596 PG 10 WC Engineering, Aerospace SC Engineering GA BD05J UT WOS:A1994BD05J00061 ER PT J AU SAUER, CG YEN, CWL AF SAUER, CG YEN, CWL BE Marec, JP Chernyi, GG Grey, J Saito, S TI PLANETARY MISSION CAPABILITY OF SMALL LOW POWER SOLAR ELECTRIC PROPULSION SYSTEMS SO ACTA ASTRONAUTICA, VOL 35, SUPPLEMENT, 1995: PROCEEDINGS OF THE IAA INTERNATIONAL CONFERENCE ON LOW-COST PLANETARY MISSIONS LA English DT Proceedings Paper CT IAA International Conference on Low-Cost Planetary Missions CY APR 12-15, 1994 CL JOHNS HOPKINS UNIV, APPL PHYS LAB, LAUREL, MD SP INT ACAD ASTRONAUT, AMER ASTRONAUT SOC, NASA, EUROPEAN SPACE ADM, CTR NATL ETUDES SPATIALES, DEUT AGENTUR RAUMFAHRTANGELEGENHEITEN, INST SPACE & ASTRONAUT SCI, SPACE RES INST, AEROSPATIALE ESPACE & DEF, ALCATEL ESPACE, MARTIN MARIETTA CORP, MCDONNELL DOUGLAS AEROSP HO JOHNS HOPKINS UNIV, APPL PHYS LAB C1 JET PROP LAB,PASADENA,CA 91109. NR 0 TC 0 Z9 0 U1 0 U2 0 PU PERGAMON PRESS LTD PI OXFORD PA THE BOULEVARD LANGFORD LANE KIDLINGTON, OXFORD, ENGLAND OX5 1GB PY 1994 BP 625 EP 634 PG 10 WC Engineering, Aerospace SC Engineering GA BD05J UT WOS:A1994BD05J00065 ER PT J AU KAKUDA, R SERCEL, J LEE, W AF KAKUDA, R SERCEL, J LEE, W BE Marec, JP Chernyi, GG Grey, J Saito, S TI SMALL BODY RENDEZVOUS MISSION USING SOLAR ELECTRIC ION PROPULSION - LOW COST MISSION APPROACH AND TECHNOLOGY REQUIREMENTS SO ACTA ASTRONAUTICA, VOL 35, SUPPLEMENT, 1995: PROCEEDINGS OF THE IAA INTERNATIONAL CONFERENCE ON LOW-COST PLANETARY MISSIONS LA English DT Proceedings Paper CT IAA International Conference on Low-Cost Planetary Missions CY APR 12-15, 1994 CL JOHNS HOPKINS UNIV, APPL PHYS LAB, LAUREL, MD SP INT ACAD ASTRONAUT, AMER ASTRONAUT SOC, NASA, EUROPEAN SPACE ADM, CTR NATL ETUDES SPATIALES, DEUT AGENTUR RAUMFAHRTANGELEGENHEITEN, INST SPACE & ASTRONAUT SCI, SPACE RES INST, AEROSPATIALE ESPACE & DEF, ALCATEL ESPACE, MARTIN MARIETTA CORP, MCDONNELL DOUGLAS AEROSP HO JOHNS HOPKINS UNIV, APPL PHYS LAB C1 JET PROP LAB,PASADENA,CA 91109. NR 0 TC 0 Z9 0 U1 0 U2 0 PU PERGAMON PRESS LTD PI OXFORD PA THE BOULEVARD LANGFORD LANE KIDLINGTON, OXFORD, ENGLAND OX5 1GB PY 1994 BP 657 EP 666 PG 10 WC Engineering, Aerospace SC Engineering GA BD05J UT WOS:A1994BD05J00068 ER PT J AU CASANI, EK METZGER, RM AF CASANI, EK METZGER, RM BE Marec, JP Chernyi, GG Grey, J Saito, S TI REENGINEERING THE PROJECT DESIGN PROCESS SO ACTA ASTRONAUTICA, VOL 35, SUPPLEMENT, 1995: PROCEEDINGS OF THE IAA INTERNATIONAL CONFERENCE ON LOW-COST PLANETARY MISSIONS LA English DT Proceedings Paper CT IAA International Conference on Low-Cost Planetary Missions CY APR 12-15, 1994 CL JOHNS HOPKINS UNIV, APPL PHYS LAB, LAUREL, MD SP INT ACAD ASTRONAUT, AMER ASTRONAUT SOC, NASA, EUROPEAN SPACE ADM, CTR NATL ETUDES SPATIALES, DEUT AGENTUR RAUMFAHRTANGELEGENHEITEN, INST SPACE & ASTRONAUT SCI, SPACE RES INST, AEROSPATIALE ESPACE & DEF, ALCATEL ESPACE, MARTIN MARIETTA CORP, MCDONNELL DOUGLAS AEROSP HO JOHNS HOPKINS UNIV, APPL PHYS LAB C1 JET PROP LAB,FLIGHT PROJECTS IMPLEMENTAT DEV OFF,PASADENA,CA 91109. NR 0 TC 0 Z9 0 U1 0 U2 0 PU PERGAMON PRESS LTD PI OXFORD PA THE BOULEVARD LANGFORD LANE KIDLINGTON, OXFORD, ENGLAND OX5 1GB PY 1994 BP 681 EP 689 PG 9 WC Engineering, Aerospace SC Engineering GA BD05J UT WOS:A1994BD05J00071 ER PT J AU HERMAN, MI BURKHART, S CRIST, R VACCHIONE, J HIGHES, R KELLOGG, K KERMODE, A RASCOE, D HORNBUCKLE, C HOFFMANN, W SMITH, D AF HERMAN, MI BURKHART, S CRIST, R VACCHIONE, J HIGHES, R KELLOGG, K KERMODE, A RASCOE, D HORNBUCKLE, C HOFFMANN, W SMITH, D BE Marec, JP Chernyi, GG Grey, J Saito, S TI MICROTECHNOLOGY IN TELECOMMUNICATIONS FOR SPACECRAFT COST AND MASS REDUCTION SO ACTA ASTRONAUTICA, VOL 35, SUPPLEMENT, 1995: PROCEEDINGS OF THE IAA INTERNATIONAL CONFERENCE ON LOW-COST PLANETARY MISSIONS LA English DT Proceedings Paper CT IAA International Conference on Low-Cost Planetary Missions CY APR 12-15, 1994 CL JOHNS HOPKINS UNIV, APPL PHYS LAB, LAUREL, MD SP INT ACAD ASTRONAUT, AMER ASTRONAUT SOC, NASA, EUROPEAN SPACE ADM, CTR NATL ETUDES SPATIALES, DEUT AGENTUR RAUMFAHRTANGELEGENHEITEN, INST SPACE & ASTRONAUT SCI, SPACE RES INST, AEROSPATIALE ESPACE & DEF, ALCATEL ESPACE, MARTIN MARIETTA CORP, MCDONNELL DOUGLAS AEROSP HO JOHNS HOPKINS UNIV, APPL PHYS LAB C1 JET PROP LAB,PASADENA,CA 91109. NR 0 TC 0 Z9 0 U1 0 U2 0 PU PERGAMON PRESS LTD PI OXFORD PA THE BOULEVARD LANGFORD LANE KIDLINGTON, OXFORD, ENGLAND OX5 1GB PY 1994 BP 723 EP 732 PG 10 WC Engineering, Aerospace SC Engineering GA BD05J UT WOS:A1994BD05J00076 ER PT J AU STATMAN, JI AF STATMAN, JI BE Marec, JP Chernyi, GG Grey, J Saito, S TI COMMUNICATIONS FOR LOW COST PLANETARY MISSIONS SO ACTA ASTRONAUTICA, VOL 35, SUPPLEMENT, 1995: PROCEEDINGS OF THE IAA INTERNATIONAL CONFERENCE ON LOW-COST PLANETARY MISSIONS LA English DT Proceedings Paper CT IAA International Conference on Low-Cost Planetary Missions CY APR 12-15, 1994 CL JOHNS HOPKINS UNIV, APPL PHYS LAB, LAUREL, MD SP INT ACAD ASTRONAUT, AMER ASTRONAUT SOC, NASA, EUROPEAN SPACE ADM, CTR NATL ETUDES SPATIALES, DEUT AGENTUR RAUMFAHRTANGELEGENHEITEN, INST SPACE & ASTRONAUT SCI, SPACE RES INST, AEROSPATIALE ESPACE & DEF, ALCATEL ESPACE, MARTIN MARIETTA CORP, MCDONNELL DOUGLAS AEROSP HO JOHNS HOPKINS UNIV, APPL PHYS LAB C1 JET PROP LAB,PASADENA,CA 91109. NR 0 TC 0 Z9 0 U1 0 U2 0 PU PERGAMON PRESS LTD PI OXFORD PA THE BOULEVARD LANGFORD LANE KIDLINGTON, OXFORD, ENGLAND OX5 1GB PY 1994 BP 733 EP 739 PG 7 WC Engineering, Aerospace SC Engineering GA BD05J UT WOS:A1994BD05J00077 ER PT J AU LOWRY, LE PROKOP, JS SANDBORN, P EVANS, K AF LOWRY, LE PROKOP, JS SANDBORN, P EVANS, K BE Marec, JP Chernyi, GG Grey, J Saito, S TI THE APPLICATION OF HIGH DENSITY ELECTRONIC PACKAGING FOR SPACECRAFT COST AND MASS REDUCTION SO ACTA ASTRONAUTICA, VOL 35, SUPPLEMENT, 1995: PROCEEDINGS OF THE IAA INTERNATIONAL CONFERENCE ON LOW-COST PLANETARY MISSIONS LA English DT Proceedings Paper CT IAA International Conference on Low-Cost Planetary Missions CY APR 12-15, 1994 CL JOHNS HOPKINS UNIV, APPL PHYS LAB, LAUREL, MD SP INT ACAD ASTRONAUT, AMER ASTRONAUT SOC, NASA, EUROPEAN SPACE ADM, CTR NATL ETUDES SPATIALES, DEUT AGENTUR RAUMFAHRTANGELEGENHEITEN, INST SPACE & ASTRONAUT SCI, SPACE RES INST, AEROSPATIALE ESPACE & DEF, ALCATEL ESPACE, MARTIN MARIETTA CORP, MCDONNELL DOUGLAS AEROSP HO JOHNS HOPKINS UNIV, APPL PHYS LAB C1 JET PROP LAB,PASADENA,CA 91109. NR 0 TC 0 Z9 0 U1 0 U2 0 PU PERGAMON PRESS LTD PI OXFORD PA THE BOULEVARD LANGFORD LANE KIDLINGTON, OXFORD, ENGLAND OX5 1GB PY 1994 BP 763 EP 769 PG 7 WC Engineering, Aerospace SC Engineering GA BD05J UT WOS:A1994BD05J00081 ER PT J AU KHONSARI, MM BREWE, DE AF KHONSARI, MM BREWE, DE TI EFFECT OF VISCOUS DISSIPATION ON THE LUBRICATION CHARACTERISTICS OF MICROPOLAR FLUIDS SO ACTA MECHANICA LA English DT Article ID JOURNAL BEARINGS; HYDRODYNAMIC BEARINGS AB Thermohydrodynamic solutions are presented for a finite journal bearing lubricated with micropolar fluid. Comparison with isothermal results, assuming that viscosity remains at the inlet temperature, is also given. Results indicate the heat generation due to viscous dissipation plays an important role on the load-carrying of a journal bearing lubricated with micropolar fluids. C1 NASA,LEWIS RES CTR,CLEVELAND,OH 44135. RP KHONSARI, MM (reprint author), UNIV PITTSBURGH,DEPT MECH ENGN,PITTSBURGH,PA 15261, USA. NR 11 TC 9 Z9 9 U1 0 U2 2 PU SPRINGER-VERLAG WIEN PI VIENNA PA SACHSENPLATZ 4-6, PO BOX 89, A-1201 VIENNA, AUSTRIA SN 0001-5970 J9 ACTA MECH JI Acta Mech. PY 1994 VL 105 IS 1-4 BP 57 EP 68 DI 10.1007/BF01183942 PG 12 WC Mechanics SC Mechanics GA NW086 UT WOS:A1994NW08600006 ER PT J AU GARG, VK AF GARG, VK TI HEAT-TRANSFER DUE TO STAGNATION POINT FLOW OF A NON-NEWTONIAN FLUID SO ACTA MECHANICA LA English DT Article ID STABILITY; GRADE AB Heat transfer analysis for steady, laminar flow of an incompressible, homogeneous, non-Newtonian fluid of second grade at a stagnation point is presented. A pseudosimilarity solution is used that enables computation of the flow characteristics for any value of the dimensionless normal stress modulus, K, of the fluid. The energy equation is discretized using central differences, and solved using the Thomas algorithm. A powerlaw variation for the wall temperature is assumed. Results provide the effect of non-Newtonian nature of the fluid on the heat transfer characteristics for different values of Prandtl and Eckert numbers, and wall-temperature variation. Results match exactly with those from an earlier perturbation analysis for small K. For large K as well as for the effect of viscous dissipation, no results are available heretofore. Amongst other applications, the analysis is relevant to the impingement of a non-Newtonian jet on a flat surface. RP GARG, VK (reprint author), NASA,LEWIS RES CTR,DIV INTERNAL FLUID MECH,MAIL STOP 5-11,CLEVELAND,OH 44135, USA. NR 14 TC 17 Z9 17 U1 0 U2 0 PU SPRINGER-VERLAG WIEN PI VIENNA PA SACHSENPLATZ 4-6, PO BOX 89, A-1201 VIENNA, AUSTRIA SN 0001-5970 J9 ACTA MECH JI Acta Mech. PY 1994 VL 104 IS 3-4 BP 159 EP 171 DI 10.1007/BF01170062 PG 13 WC Mechanics SC Mechanics GA NG734 UT WOS:A1994NG73400003 ER PT J AU ROSS, MD AF ROSS, MD TI A SPACEFLIGHT STUDY OF SYNAPTIC PLASTICITY IN ADULT-RAT VESTIBULAR MACULAS SO ACTA OTO-LARYNGOLOGICA LA English DT Article ID LONG-TERM POTENTIATION; COMPUTER GENERATED IMAGERY; SPACE MOTION SICKNESS; VISUAL-CORTEX; RETINOTECTAL PROJECTION; INNERVATION PATTERNS; NUMERICAL DENSITY; 3-D COMPONENTS; SYNAPSES; RECEPTORS AB Behavioral signs of vestibular perturbation in altered gravity have not been well correlated with structural modifications in neurovestibular centers. This ultrastructural research investigated synaptic plasticity in hair cells of adult rat utricular maculas exposed to microgravity for nine days on a space shuttle. The hypothesis was that synaptic plasticity would be more evident in type II hair cells because they are part of a distributed modifying macular circuitry. All rats were shared with other investigators and were subjected to treatments unrelated to this experiment. Maculas were obtained from flight and control rats after shuttle return (R + 0) and nine days post-flight (R + 9). R + 9 rats had chromodacryorrhea, a sign of acute stress. Tissues were prepared for ultrastructural study by conventional methods. Ribbon synapses were counted in fifty serial sections from medial utricular macular regions of three rats of each flight and control group. Counts in fifty additional consecutive sections from one sample in each group established method reliability. Ail synapses were photographed and located to specific cells on mosaics of entire sections. Pooled data were analyzed statistically. Flown rats showed abnormal posture and movement at R + 0. They had statistically significant increases in total ribbon synapses and in sphere-like ribbons in both kinds of hair cells; in type II cells, pairs of synapses nearly doubled and clusters of 3 to 6 synapses increased twelve-fold. At R + 9, behavioral signs were normal. However, synapse counts remained high in both kinds of hair cells of flight maculas and were elevated in control type II cells. Only counts in type I cells showed statistically significant differences at R + 9. High synaptic counts at R + 9 may have resulted from stress due to experimental treatments. The results nevertheless demonstrate that adult maculas retain the potential for synaptic plasticity. Type II cells exhibited more synaptic plasticity, but space flight induced synaptic plasticity in type I cells. RP ROSS, MD (reprint author), NASA,AMES RES CTR,CTR BIOCOMPUTAT,MOFFETT FIELD,CA 94035, USA. NR 64 TC 2 Z9 2 U1 0 U2 2 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 1994 SU 516 BP 3 EP 14 PG 12 WC Otorhinolaryngology SC Otorhinolaryngology GA PB886 UT WOS:A1994PB88600001 ER PT J AU HARGENS, AR AF HARGENS, AR TI RECENT BED REST RESULTS AND COUNTERMEASURE DEVELOPMENT AT NASA SO ACTA PHYSIOLOGICA SCANDINAVICA LA English DT Article; Proceedings Paper CT 1st International Symposium on Inactivity and Health: Effects of Bed Rest on Health CY APR 17, 1993 CL UNIV TOKYO, TOKYO, JAPAN SP UNIV TOKYO, FAC MED, RES PROJECT INACT & HLTH HO UNIV TOKYO DE BED REST DECONDITIONING; BLOOD PRESSURE AND FLOW; CARDIOVASCULAR; MUSCULOSKELETAL ID BODY NEGATIVE-PRESSURE; SKELETAL-MUSCLE; FLUID SHIFTS; EXERCISE; HUMANS; HEAD; FLOW; MICROGRAVITY; RESPONSES; SPACE AB Bedrest studies of normal subjects provide opportunities to understand physiologic responses to supine posture and inactivity. Furthermore, head-down tilt has been a valuable procedure to investigate adaptation to microgravity and development of countermeasures to maintain the health and well-being of humans during spaceflight. Recent bedrest experiments at NASA have ranged in duration from a few hours to 17 weeks. Acute studies of 6-degrees head-down tilt indicate that elevation of capillary blood pressure from 28 to 34 mm Hg and increased capillary perfusion in tissues of the head cause facial and intracranial edema. Intracranial pressure increases from 2 to 17 mm Hg going from upright posture to 6-degrees head-down tilt. Microvessels of the head have a low capacity to constrict and diminish local perfusion. Elevation of blood and tissue fluid pressures/flow in the head may also explain the higher headward bone density associated with long-term head-down tilt. These mechanistic studies of head-down tilt, along with a better understanding of the relative stresses involved with upright posture and lower body negative pressure, have facilitated development of suitable physiologic countermeasures to maintain astronaut health during microgravity. Presently no exercise hardware is available to provide a blood pressure gradient from head to feet in space. However, recent studies in our laboratory suggest that treadmill exercise using a graded lower-body compression suit and 100 mmHg lower body negative pressure provides equivalent or greater physiologic stress than similar upright exercise on Earth. Therefore, exercise within a lower body negative pressure chamber may provide a cost-effective and simple countermeasure to maintain the cardiovascular and neuro-musculoskeletal systems of astronauts during long-duration flight. RP HARGENS, AR (reprint author), NASA,AMES RES CTR,DIV LIFE SCI 23911,MOFFETT FIELD,CA 94035, USA. NR 46 TC 12 Z9 14 U1 0 U2 2 PU BLACKWELL SCIENCE LTD PI OXFORD PA OSNEY MEAD, OXFORD, OXON, ENGLAND OX2 0EL SN 0001-6772 J9 ACTA PHYSIOL SCAND JI Acta Physiol. Scand. PY 1994 VL 150 SU 616 BP 103 EP 114 PG 12 WC Physiology SC Physiology GA NE265 UT WOS:A1994NE26500014 ER PT B AU LEVINE, BM JANESICK, JR SHELTON, JC AF LEVINE, BM JANESICK, JR SHELTON, JC BE Ealey, MA Merkle, F TI DEVELOPMENT OF A LOW-NOISE HIGH FRAME RATE CCD FOR ADAPTIVE OPTICS SO ADAPTIVE OPTICS IN ASTRONOMY SE PROCEEDINGS OF THE SOCIETY OF PHOTO-OPTICAL INSTRUMENTATION ENGINEERS (SPIE) LA English DT Proceedings Paper CT Conference on Adaptive Optics in Astronomy CY MAR 17-18, 1994 CL KONA, HI SP SOC PHOTO OPT INSTRUMENTAT ENGINEERS, AMER ASTRON SOC, ASTRON SOC PACIFIC, EUROPEAN ASTRON SOC, OPT SOC AMER C1 JET PROP LAB,PASADENA,CA 91109. 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 0-8194-1496-4 J9 P SOC PHOTO-OPT INS PY 1994 VL 2201 BP 596 EP 606 DI 10.1117/12.176094 PG 11 WC Astronomy & Astrophysics; Optics SC Astronomy & Astrophysics; Optics GA BA83N UT WOS:A1994BA83N00059 ER PT B AU REDDING, D MILMAN, M NEEDELS, L AF REDDING, D MILMAN, M NEEDELS, L BE Ealey, MA Merkle, F TI A LARGE-TELESCOPE NATURAL GUIDE STAR ADAPTIVE OPTICS SYSTEM SO ADAPTIVE OPTICS IN ASTRONOMY SE PROCEEDINGS OF THE SOCIETY OF PHOTO-OPTICAL INSTRUMENTATION ENGINEERS (SPIE) LA English DT Proceedings Paper CT Conference on Adaptive Optics in Astronomy CY MAR 17-18, 1994 CL KONA, HI SP SOC PHOTO OPT INSTRUMENTAT ENGINEERS, AMER ASTRON SOC, ASTRON SOC PACIFIC, EUROPEAN ASTRON SOC, OPT SOC AMER 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 0-8194-1496-4 J9 P SOC PHOTO-OPT INS PY 1994 VL 2201 BP 619 EP 628 DI 10.1117/12.176097 PG 10 WC Astronomy & Astrophysics; Optics SC Astronomy & Astrophysics; Optics GA BA83N UT WOS:A1994BA83N00062 ER PT B AU MILMAN, M NEEDELS, L REDDING, D AF MILMAN, M NEEDELS, L REDDING, D BE Ealey, MA Merkle, F TI WAVE-FRONT RECONSTRUCTION METHODS FOR A NATURAL GUIDE STAR ADAPTIVE OPTICS APPLICATION TO THE KECK TELESCOPE SO ADAPTIVE OPTICS IN ASTRONOMY SE PROCEEDINGS OF THE SOCIETY OF PHOTO-OPTICAL INSTRUMENTATION ENGINEERS (SPIE) LA English DT Proceedings Paper CT Conference on Adaptive Optics in Astronomy CY MAR 17-18, 1994 CL KONA, HI SP SOC PHOTO OPT INSTRUMENTAT ENGINEERS, AMER ASTRON SOC, ASTRON SOC PACIFIC, EUROPEAN ASTRON SOC, OPT SOC AMER 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 0-8194-1496-4 J9 P SOC PHOTO-OPT INS PY 1994 VL 2201 BP 666 EP 679 DI 10.1117/12.176037 PG 14 WC Astronomy & Astrophysics; Optics SC Astronomy & Astrophysics; Optics GA BA83N UT WOS:A1994BA83N00068 ER PT B AU MACNEAL, P JEWETT, K SEVASTON, G DORSKY, L AF MACNEAL, P JEWETT, K SEVASTON, G DORSKY, L BE Ealey, MA Merkle, F TI FABRICATION AND TESTING OF A LARGE ACTIVE PRIMARY REFLECTOR STRUCTURE SO ADAPTIVE OPTICS IN ASTRONOMY SE PROCEEDINGS OF THE SOCIETY OF PHOTO-OPTICAL INSTRUMENTATION ENGINEERS (SPIE) LA English DT Proceedings Paper CT Conference on Adaptive Optics in Astronomy CY MAR 17-18, 1994 CL KONA, HI SP SOC PHOTO OPT INSTRUMENTAT ENGINEERS, AMER ASTRON SOC, ASTRON SOC PACIFIC, EUROPEAN ASTRON SOC, OPT SOC AMER 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 0-8194-1496-4 J9 P SOC PHOTO-OPT INS PY 1994 VL 2201 BP 776 EP 787 DI 10.1117/12.176113 PG 12 WC Astronomy & Astrophysics; Optics SC Astronomy & Astrophysics; Optics GA BA83N UT WOS:A1994BA83N00078 ER PT B AU LASKIN, RA FANSON, JL AF LASKIN, RA FANSON, JL BE Ealey, MA Merkle, F TI TECHNOLOGY FOR QUIET OPTICAL-SYSTEMS IN-SPACE SO ADAPTIVE OPTICS IN ASTRONOMY SE PROCEEDINGS OF THE SOCIETY OF PHOTO-OPTICAL INSTRUMENTATION ENGINEERS (SPIE) LA English DT Proceedings Paper CT Conference on Adaptive Optics in Astronomy CY MAR 17-18, 1994 CL KONA, HI SP SOC PHOTO OPT INSTRUMENTAT ENGINEERS, AMER ASTRON SOC, ASTRON SOC PACIFIC, EUROPEAN ASTRON SOC, OPT SOC AMER 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 0-8194-1496-4 J9 P SOC PHOTO-OPT INS PY 1994 VL 2201 BP 844 EP 855 DI 10.1117/12.176118 PG 12 WC Astronomy & Astrophysics; Optics SC Astronomy & Astrophysics; Optics GA BA83N UT WOS:A1994BA83N00084 ER PT B AU MALBET, F SHAO, M YU, J AF MALBET, F SHAO, M YU, J BE Ealey, MA Merkle, F TI ACTIVE OPTICS AND CORONAGRAPHY WITH THE HUBBLE-SPACE-TELESCOPE SO ADAPTIVE OPTICS IN ASTRONOMY SE PROCEEDINGS OF THE SOCIETY OF PHOTO-OPTICAL INSTRUMENTATION ENGINEERS (SPIE) LA English DT Proceedings Paper CT Conference on Adaptive Optics in Astronomy CY MAR 17-18, 1994 CL KONA, HI SP SOC PHOTO OPT INSTRUMENTAT ENGINEERS, AMER ASTRON SOC, ASTRON SOC PACIFIC, EUROPEAN ASTRON SOC, OPT SOC AMER C1 JET PROP LAB,SPATIAL INTERFEROMETRY GRP,PASADENA,CA 91109. NR 0 TC 10 Z9 10 U1 1 U2 1 PU SPIE - INT SOC OPTICAL ENGINEERING PI BELLINGHAM PA PO BOX 10, BELLINGHAM, WA 98227-0010 BN 0-8194-1496-4 J9 P SOC PHOTO-OPT INS PY 1994 VL 2201 BP 1135 EP 1144 DI 10.1117/12.176025 PG 10 WC Astronomy & Astrophysics; Optics SC Astronomy & Astrophysics; Optics GA BA83N UT WOS:A1994BA83N00113 ER PT J AU PROGAR, DJ DEZERN, JF AF PROGAR, DJ DEZERN, JF GP ADHES SOC TI COMPARISON OF THE ADHESIVE PROPERTIES OF 2 ISOMERIC POLYETHERIMIDES SO ADHESION SOCIETY - PROCEEDINGS OF THE SEVENTEENTH ANNUAL MEETING AND THE SYMPOSIUM ON PARTICLE ADHESION LA English DT Proceedings Paper CT 17th Annual Meeting of the Adhesion-Society/Symposium on Particle Adhesion CY FEB 20-23, 1994 CL ORLANDO, FL SP ADHES SOC, LOCTITE CORP, NORTON CHEM C1 NASA,LANGLEY RES CTR,HAMPTON,VA 23681. 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 1994 BP 108 EP 111 PG 4 WC Engineering, Chemical; Engineering, Mechanical; Materials Science, Coatings & Films SC Engineering; Materials Science GA BB92Y UT WOS:A1994BB92Y00034 ER PT B AU Bierbower, W AF Bierbower, W GP AMER WELDING SOC TI ''Partnering'' for commercialization: NASA's cooperative R&D programs for technology development SO ADVANCED JOINING TECHNOLOGIES FOR NEW MATERIALS II, CONFERENCE PROCEEDINGS LA English DT Proceedings Paper CT Advanced Joining Technologies for New Materials II Conference CY MAR 02-04, 1994 CL COCOA BEACH, FL SP Amer Welding Soc C1 NASA HEADQUARTERS,WASHINGTON,DC 20546. NR 0 TC 0 Z9 0 U1 0 U2 0 PU AMERICAN WELDING SOC PI MIAMI PA 550 NW LEJEUNE RD, PO BOX 351040, MIAMI, FL 33135 BN 0-87171-441-8 PY 1994 BP 2 EP 2 PG 1 WC Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering SC Materials Science; Metallurgy & Metallurgical Engineering GA BD62H UT WOS:A1994BD62H00002 ER PT B AU SU, GH LEHOCZKY, SL SZOFRAN, FR GILLIES, DC SHA, YG COBB, SD ANDREWS, RN AF SU, GH LEHOCZKY, SL SZOFRAN, FR GILLIES, DC SHA, YG COBB, SD ANDREWS, RN BE Masumoto, T Inoue, A Makiwshima, A Arnberg, L Doyama, M Baskes, MI Nieminen, R Kuribayashie, K Hashimoto, H Saghir, MZE Sawaoka, A Sokolowski, RS Walter, HU Kishi, T TI CRYSTAL GROWTH OF SELECTED II-VI SEMICONDUCTING ALLOYS BY DIRECTIONAL SOLIDIFICATION IN MICROGRAVITY SO ADVANCED MATERIALS '93, III - A & B: A: COMPUTATIONS, GLASSY MATERIALS, MICROGRAVITY AND NON-DESTRUCTIVE TESTING; B: COMPOSITES, GRAIN BOUNDARIES AND NANOPHASE MATERIALS SE TRANSACTIONS OF THE MATERIALS RESEARCH SOCIETY OF JAPAN LA English DT Proceedings Paper CT 3rd IUMRS International Conference on Advanced Materials (ICAM) CY AUG 31-SEP 04, 1993 CL SUNSHINE CITY, JAPAN SP INT UNION MAT RES SOC, NIKKAN KOGYO SHIMBUN LTD 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 ELSEVIER SCIENCE PUBL B V PI AMSTERDAM PA SARA BURGERHARTSTRAAT 25, PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS BN 0-444-81993-2 J9 T MRS JAP PY 1994 VL 16 IS A & B BP 699 EP 706 PG 8 WC Materials Science, Multidisciplinary; Materials Science, Characterization & Testing; Materials Science, Composites SC Materials Science GA BC69G UT WOS:A1994BC69G00155 ER PT J AU ZAKRAJSEK, JJ HANDSCHUH, RR DECKER, HJ AF ZAKRAJSEK, JJ HANDSCHUH, RR DECKER, HJ BE Pusey, HC Pusey, SC TI Application of fault detection techniques to spiral bevel gear fatigue data SO ADVANCED MATERIALS AND PROCESS TECHNOLOGY FOR MECHANICAL FAILURE PREVENTION LA English DT Proceedings Paper CT 48th Meeting of the Mechanical Failures Prevention Group - Advanced Materials and Process Technology for Mechanical Failure Prevention CY APR 19-21, 1994 CL WAKEFIELD, MA SP Mech Failures Prevent Grp, USN, Off Naval Res, Naval Surf Warfare Ctr, Naval Civil Engn Lab, USA Res Lab, Vibrat Inst DE DIAGNOSTICS; FAILURE PREDICTION; FATIGUE; GEAR C1 NASA,LEWIS RES CTR,CLEVELAND,OH 44135. NR 0 TC 0 Z9 0 U1 0 U2 0 PU VIBRATION INST PI CLARENDON PA 101 W 55TH ST, CLARENDON, IL 60514 PY 1994 BP 93 EP 104 PG 4 WC Engineering, Mechanical; Materials Science, Ceramics; Metallurgy & Metallurgical Engineering; Materials Science, Characterization & Testing SC Engineering; Materials Science; Metallurgy & Metallurgical Engineering GA BD67K UT WOS:A1994BD67K00009 ER PT S AU WEIZER, VG FATEMI, NS KORENYIBOTH, AL AF WEIZER, VG FATEMI, NS KORENYIBOTH, AL BE Murarka, SP Katz, A Tu, KN Maex, K TI AU/ZN CONTACTS TO P-INP - ELECTRICAL AND METALLURGICAL CHARACTERISTICS AND THE RELATIONSHIP BETWEEN THEM SO ADVANCED METALLIZATION FOR DEVICES AND CIRCUITS - SCIENCE, TECHNOLOGY AND MANUFACTURABILITY SE MATERIALS RESEARCH SOCIETY SYMPOSIUM PROCEEDINGS LA English DT Proceedings Paper CT Symposium on Advanced Metallization for Devices and Circuits: Science, Technology and Manufacturability CY APR 04-08, 1994 CL SAN FRANCISCO, CA SP MAT RES SOC C1 NASA,LEWIS RES CTR,CLEVELAND,OH 44135. NR 0 TC 0 Z9 0 U1 0 U2 1 PU MATERIALS RESEARCH SOC PI PITTSBURGH PA 9800 MCKNIGHT RD, SUITE 327, PITTSBURGH, PA 15237 SN 0272-9172 BN 1-55899-237-5 J9 MATER RES SOC SYMP P PY 1994 VL 337 BP 369 EP 374 PG 6 WC Metallurgy & Metallurgical Engineering; Materials Science, Coatings & Films; Physics, Condensed Matter SC Metallurgy & Metallurgical Engineering; Materials Science; Physics GA BB59J UT WOS:A1994BB59J00046 ER PT B AU CARLE, GC KOJIRO, DR SAUKE, TB VALENTIN, JR SHEN, TC MARSHALL, JR AF CARLE, GC KOJIRO, DR SAUKE, TB VALENTIN, JR SHEN, TC MARSHALL, JR BE Cutts, JA TI ADVANCED INSTRUMENTATION FOR EXOBIOLOGY SO ADVANCED MICRODEVICES AND SPACE SCIENCE SENSORS SE PROCEEDINGS OF THE SOCIETY OF PHOTO-OPTICAL INSTRUMENTATION ENGINEERS (SPIE) LA English DT Proceedings Paper CT Conference on Advanced Microdevices and Space Science Sensors CY JUL 28-29, 1994 CL SAN DIEGO, CA SP SOC PHOTO OPT INSTRUMENTAT ENGINEERS DE GAS CHROMATOGRAPHY; EXOBIOLOGY; ION MOBILITY SPECTROMETRY; MICRODEVICES; ISOTOPIC ANALYSIS; X-RAY ANALYSIS; PYROSENSORS; MULTIPLEX CHROMATOGRAPHY C1 NASA,AMES RES CTR,MOFFETT FIELD,CA 94035. NR 0 TC 2 Z9 2 U1 0 U2 0 PU SPIE - INT SOC OPTICAL ENGINEERING PI BELLINGHAM PA PO BOX 10, BELLINGHAM, WA 98227-0010 BN 0-8194-1591-X J9 P SOC PHOTO-OPT INS PY 1994 VL 2267 BP 2 EP 8 DI 10.1117/12.187464 PG 7 WC Engineering, Aerospace; Remote Sensing; Optics SC Engineering; Remote Sensing; Optics GA BB65U UT WOS:A1994BB65U00001 ER PT B AU COLE, HJ CITES, JS ASHLEY, PR AF COLE, HJ CITES, JS ASHLEY, PR BE Cutts, JA TI DIFFRACTIVE OPTICAL-COMPONENTS FOR FIBER-TO-WAVE-GUIDE COUPLERS SO ADVANCED MICRODEVICES AND SPACE SCIENCE SENSORS SE PROCEEDINGS OF THE SOCIETY OF PHOTO-OPTICAL INSTRUMENTATION ENGINEERS (SPIE) LA English DT Proceedings Paper CT Conference on Advanced Microdevices and Space Science Sensors CY JUL 28-29, 1994 CL SAN DIEGO, CA SP SOC PHOTO OPT INSTRUMENTAT ENGINEERS C1 NASA,GEORGE C MARSHALL SPACE FLIGHT CTR,ASTRION LAB,HUNTSVILLE,AL 35812. NR 0 TC 3 Z9 3 U1 0 U2 0 PU SPIE - INT SOC OPTICAL ENGINEERING PI BELLINGHAM PA PO BOX 10, BELLINGHAM, WA 98227-0010 BN 0-8194-1591-X J9 P SOC PHOTO-OPT INS PY 1994 VL 2267 BP 31 EP 38 DI 10.1117/12.187476 PG 8 WC Engineering, Aerospace; Remote Sensing; Optics SC Engineering; Remote Sensing; Optics GA BB65U UT WOS:A1994BB65U00005 ER PT B AU KSENDZOV, A FATHAUER, RW MAKER, PD MULLER, R PIKE, WT GEORGE, T AF KSENDZOV, A FATHAUER, RW MAKER, PD MULLER, R PIKE, WT GEORGE, T BE Cutts, JA TI INTERFEROMETRIC OPTICAL FILTERS UTILIZING METAL PATTERNS ON FREESTANDING THIN SUBSTRATES SO ADVANCED MICRODEVICES AND SPACE SCIENCE SENSORS SE PROCEEDINGS OF THE SOCIETY OF PHOTO-OPTICAL INSTRUMENTATION ENGINEERS (SPIE) LA English DT Proceedings Paper CT Conference on Advanced Microdevices and Space Science Sensors CY JUL 28-29, 1994 CL SAN DIEGO, CA SP SOC PHOTO OPT INSTRUMENTAT ENGINEERS C1 JET PROP LAB,CTR SPACE MICROELECTR,PASADENA,CA 91109. 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 0-8194-1591-X J9 P SOC PHOTO-OPT INS PY 1994 VL 2267 BP 39 EP 49 DI 10.1117/12.187477 PG 11 WC Engineering, Aerospace; Remote Sensing; Optics SC Engineering; Remote Sensing; Optics GA BB65U UT WOS:A1994BB65U00006 ER PT B AU MAKER, PD MULLER, RE AF MAKER, PD MULLER, RE BE Cutts, JA TI ANALOG PHASE HOLOGRAMS BY ELECTRON-BEAM LITHOGRAPHY SO ADVANCED MICRODEVICES AND SPACE SCIENCE SENSORS SE PROCEEDINGS OF THE SOCIETY OF PHOTO-OPTICAL INSTRUMENTATION ENGINEERS (SPIE) LA English DT Proceedings Paper CT Conference on Advanced Microdevices and Space Science Sensors CY JUL 28-29, 1994 CL SAN DIEGO, CA SP SOC PHOTO OPT INSTRUMENTAT ENGINEERS DE PHASE-HOLOGRAMS; COMPUTER GENERATED PHASE HOLOGRAMS; DIFFRACTIVE OPTICS; BINARY OPTICS C1 JET PROP LAB,CTR SPACE MICROELECTR TECHNOL,PASADENA,CA 91109. NR 0 TC 2 Z9 2 U1 0 U2 0 PU SPIE - INT SOC OPTICAL ENGINEERING PI BELLINGHAM PA PO BOX 10, BELLINGHAM, WA 98227-0010 BN 0-8194-1591-X J9 P SOC PHOTO-OPT INS PY 1994 VL 2267 BP 50 EP 55 DI 10.1117/12.187478 PG 6 WC Engineering, Aerospace; Remote Sensing; Optics SC Engineering; Remote Sensing; Optics GA BB65U UT WOS:A1994BB65U00007 ER PT B AU SOLL, S GRAHAM, R RAMIREZ, L AF SOLL, S GRAHAM, R RAMIREZ, L BE Cutts, JA TI MINIATURIZED ELECTRONIC SYSTEM FOR THE PLANETARY INTEGRATED CAMERA SPECTROMETER SO ADVANCED MICRODEVICES AND SPACE SCIENCE SENSORS SE PROCEEDINGS OF THE SOCIETY OF PHOTO-OPTICAL INSTRUMENTATION ENGINEERS (SPIE) LA English DT Proceedings Paper CT Conference on Advanced Microdevices and Space Science Sensors CY JUL 28-29, 1994 CL SAN DIEGO, CA SP SOC PHOTO OPT INSTRUMENTAT ENGINEERS C1 JET PROP LAB,PASADENA,CA 91109. NR 0 TC 0 Z9 0 U1 1 U2 1 PU SPIE - INT SOC OPTICAL ENGINEERING PI BELLINGHAM PA PO BOX 10, BELLINGHAM, WA 98227-0010 BN 0-8194-1591-X J9 P SOC PHOTO-OPT INS PY 1994 VL 2267 BP 93 EP 97 DI 10.1117/12.187468 PG 5 WC Engineering, Aerospace; Remote Sensing; Optics SC Engineering; Remote Sensing; Optics GA BB65U UT WOS:A1994BB65U00012 ER PT B AU FOSSUM, ER AF FOSSUM, ER BE Cutts, JA TI ULTRA-LOW POWER IMAGING-SYSTEMS USING CMOS IMAGE SENSOR TECHNOLOGY SO ADVANCED MICRODEVICES AND SPACE SCIENCE SENSORS SE PROCEEDINGS OF THE SOCIETY OF PHOTO-OPTICAL INSTRUMENTATION ENGINEERS (SPIE) LA English DT Proceedings Paper CT Conference on Advanced Microdevices and Space Science Sensors CY JUL 28-29, 1994 CL SAN DIEGO, CA SP SOC PHOTO OPT INSTRUMENTAT ENGINEERS C1 JET PROP LAB,CTR SPACE MICROELECTR TECHNOL,PASADENA,CA 91109. NR 0 TC 2 Z9 2 U1 0 U2 0 PU SPIE - INT SOC OPTICAL ENGINEERING PI BELLINGHAM PA PO BOX 10, BELLINGHAM, WA 98227-0010 BN 0-8194-1591-X J9 P SOC PHOTO-OPT INS PY 1994 VL 2267 BP 107 EP 111 DI 10.1117/12.187470 PG 5 WC Engineering, Aerospace; Remote Sensing; Optics SC Engineering; Remote Sensing; Optics GA BB65U UT WOS:A1994BB65U00014 ER PT B AU PRAVDO, SH SHAKLAN, S TERRILE, RJ FTACLAS, C NONNENMACHER, A GATEWOOD, GD LEVY, EH AF PRAVDO, SH SHAKLAN, S TERRILE, RJ FTACLAS, C NONNENMACHER, A GATEWOOD, GD LEVY, EH BE Stepp, LM TI AN ASTROMETRIC IMAGING TELESCOPE OPTICAL-SYSTEM SO ADVANCED TECHNOLOGY OPTICAL TELESCOPES V SE PROCEEDINGS OF THE SOCIETY OF PHOTO-OPTICAL INSTRUMENTATION ENGINEERS (SPIE) LA English DT Proceedings Paper CT Conference on Advanced Technology Optical Telescopes V CY MAR 15-16, 1994 CL KONA, HI SP SOC PHOTO OPT INSTRUMENTAT ENGINEERS, AMER ASTRON SOC, ASTRON SOC PACIFIC, EUROPEAN ASTRON SOC, OPT SOC AMER 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 0-8194-1494-8 J9 P SOC PHOTO-OPT INS PY 1994 VL 2199 BP 334 EP 340 DI 10.1117/12.176201 PG 7 WC Instruments & Instrumentation; Optics SC Instruments & Instrumentation; Optics GA BA90B UT WOS:A1994BA90B00030 ER PT B AU MEINEL, AB MEINEL, MP BRECKINRIDGE, JB AF MEINEL, AB MEINEL, MP BRECKINRIDGE, JB BE Stepp, LM TI FAST - A FOLDED ASTRONOMICAL SPACE TELESCOPE SO ADVANCED TECHNOLOGY OPTICAL TELESCOPES V SE PROCEEDINGS OF THE SOCIETY OF PHOTO-OPTICAL INSTRUMENTATION ENGINEERS (SPIE) LA English DT Proceedings Paper CT Conference on Advanced Technology Optical Telescopes V CY MAR 15-16, 1994 CL KONA, HI SP SOC PHOTO OPT INSTRUMENTAT ENGINEERS, AMER ASTRON SOC, ASTRON SOC PACIFIC, EUROPEAN ASTRON SOC, OPT SOC AMER C1 JET PROP LAB,SECT 385,PASADENA,CA 91109. NR 0 TC 0 Z9 0 U1 1 U2 1 PU SPIE - INT SOC OPTICAL ENGINEERING PI BELLINGHAM PA PO BOX 10, BELLINGHAM, WA 98227-0010 BN 0-8194-1494-8 J9 P SOC PHOTO-OPT INS PY 1994 VL 2199 BP 603 EP 608 DI 10.1117/12.176228 PG 6 WC Instruments & Instrumentation; Optics SC Instruments & Instrumentation; Optics GA BA90B UT WOS:A1994BA90B00056 ER PT B AU KADOGAWA, H NORRIS, DD AF KADOGAWA, H NORRIS, DD BE Stepp, LM TI SIRTF TELESCOPE OPTICAL ENGINEERING SO ADVANCED TECHNOLOGY OPTICAL TELESCOPES V SE PROCEEDINGS OF THE SOCIETY OF PHOTO-OPTICAL INSTRUMENTATION ENGINEERS (SPIE) LA English DT Proceedings Paper CT Conference on Advanced Technology Optical Telescopes V CY MAR 15-16, 1994 CL KONA, HI SP SOC PHOTO OPT INSTRUMENTAT ENGINEERS, AMER ASTRON SOC, ASTRON SOC PACIFIC, EUROPEAN ASTRON SOC, OPT SOC AMER 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 0-8194-1494-8 J9 P SOC PHOTO-OPT INS PY 1994 VL 2199 BP 1099 EP 1106 DI 10.1117/12.176170 PG 8 WC Instruments & Instrumentation; Optics SC Instruments & Instrumentation; Optics GA BA90B UT WOS:A1994BA90B00110 ER PT J AU Trajmar, S McConkey, JW AF Trajmar, S. McConkey, J. W. TI BENCHMARK MEASUREMENTS OF CROSS SECTIONS FOR ELECTRON COLLISIONS: ANALYSIS OF SCATTERED ELECTRONS SO ADVANCES IN ATOMIC MOLECULAR AND OPTICAL PHYSICS LA English DT Article C1 [Trajmar, S.] CALTECH, Jet Prop Lab, Pasadena, CA 91125 USA. [McConkey, J. W.] Univ Windsor, Dept Phys, Windsor, ON N9B 3P4, Canada. RP Trajmar, S (reprint author), CALTECH, Jet Prop Lab, Pasadena, CA 91125 USA. FU N.A.S.A.; N.S.F. USA; NSERC, Canada; NATO, Division of Scientific Affairs FX The authors are grateful to their many colleagues and coworkers with whom they have discussed this topic over the years. Recent discussions with M. J. Brunger, S. J. Buckman, P. D. Burrow, M. Hayashi, J. C. Nickel, T. W. Shyn, L. Vuskovic and J. F. Williams have been particularly helpful. Financial support from N.A.S.A. and N.S.F. USA (S.T.), NSERC, Canada (J.W.M.) and NATO, Division of Scientific Affairs, is gratefully acknowledged. NR 178 TC 28 Z9 28 U1 1 U2 3 PU ACADEMIC PRESS INC ELSEVIER SCIENCE PI SAN DIEGO PA 525 B ST, STE 1900, SAN DIEGO, CA 92101-4495 USA SN 0065-2199 J9 ADV ATOM MOL OPT JI Adv. At. Mol. Opt. Phys. PY 1994 VL 33 BP 63 EP 96 PG 34 WC Optics; Physics, Atomic, Molecular & Chemical SC Optics; Physics GA V12WY UT WOS:000207630500003 ER PT S AU TUTTLE, JG DIPIRRO, MJ SHIRRON, PJ AF TUTTLE, JG DIPIRRO, MJ SHIRRON, PJ BE Kittel, P TI LIQUID-GAS PHASE SEPARATORS FOR THE SUPERFLUID-HELIUM ON-ORBIT TRANSFER (SHOOT) PROJECT SO ADVANCES IN CRYOGENIC ENGINEERING, VOL 39, PTS A AND B SE ADVANCES IN CRYOGENIC ENGINEERING LA English DT Proceedings Paper CT 1993 Cryogenic Engineering Conference/International Cryogenic Materials Conference CY JUL 12-16, 1993 CL ALBUQUERQUE, NM SP BABCOCK & WILCOX, INT INST REFRIGERAT, COMMISS A C1 NASA,GODDARD SPACE FLIGHT CTR,GREENBELT,MD 20771. NR 0 TC 5 Z9 5 U1 0 U2 0 PU PLENUM PRESS DIV PLENUM PUBLISHING CORP PI NEW YORK PA 233 SPRING ST, NEW YORK, NY 10013 SN 0065-2482 BN 0-306-44854-8 J9 ADV CRYOG ENG PY 1994 VL 39 BP 121 EP 128 PN A & B PG 8 WC Thermodynamics; Engineering, Electrical & Electronic; Physics, Condensed Matter SC Thermodynamics; Engineering; Physics GA BB12H UT WOS:A1994BB12H00014 ER PT S AU DIPIRRO, MJ SHIRRON, PJ TUTTLE, JG AF DIPIRRO, MJ SHIRRON, PJ TUTTLE, JG BE Kittel, P TI MASS GAUGING AND THERMOMETRY ON THE SUPERFLUID-HELIUM ON-ORBIT TRANSFER FLIGHT DEMONSTRATION SO ADVANCES IN CRYOGENIC ENGINEERING, VOL 39, PTS A AND B SE ADVANCES IN CRYOGENIC ENGINEERING LA English DT Proceedings Paper CT 1993 Cryogenic Engineering Conference/International Cryogenic Materials Conference CY JUL 12-16, 1993 CL ALBUQUERQUE, NM SP BABCOCK & WILCOX, INT INST REFRIGERAT, COMMISS A C1 NASA,GODDARD SPACE FLIGHT CTR,GREENBELT,MD 20771. NR 0 TC 13 Z9 13 U1 0 U2 0 PU PLENUM PRESS DIV PLENUM PUBLISHING CORP PI NEW YORK PA 233 SPRING ST, NEW YORK, NY 10013 SN 0065-2482 BN 0-306-44854-8 J9 ADV CRYOG ENG PY 1994 VL 39 BP 129 EP 136 PN A & B PG 8 WC Thermodynamics; Engineering, Electrical & Electronic; Physics, Condensed Matter SC Thermodynamics; Engineering; Physics GA BB12H UT WOS:A1994BB12H00015 ER PT S AU PETRAC, D ISRAELSSON, UE LUCHIK, TS AF PETRAC, D ISRAELSSON, UE LUCHIK, TS BE Kittel, P TI THE LAMBDA-POINT EXPERIMENT - HELIUM CRYOSTAT, CRYO-SERVICING, FUNCTIONS, AND PERFORMANCE SO ADVANCES IN CRYOGENIC ENGINEERING, VOL 39, PTS A AND B SE ADVANCES IN CRYOGENIC ENGINEERING LA English DT Proceedings Paper CT 1993 Cryogenic Engineering Conference/International Cryogenic Materials Conference CY JUL 12-16, 1993 CL ALBUQUERQUE, NM SP BABCOCK & WILCOX, INT INST REFRIGERAT, COMMISS A C1 JET PROP LAB,PASADENA,CA 91109. NR 0 TC 3 Z9 3 U1 0 U2 0 PU PLENUM PRESS DIV PLENUM PUBLISHING CORP PI NEW YORK PA 233 SPRING ST, NEW YORK, NY 10013 SN 0065-2482 BN 0-306-44854-8 J9 ADV CRYOG ENG PY 1994 VL 39 BP 137 EP 144 PN A & B PG 8 WC Thermodynamics; Engineering, Electrical & Electronic; Physics, Condensed Matter SC Thermodynamics; Engineering; Physics GA BB12H UT WOS:A1994BB12H00016 ER PT S AU BREON, SR HOPKINS, RA AF BREON, SR HOPKINS, RA BE Kittel, P TI THE NEW X-RAY SPECTROMETER (XRS) - A REVAMPED CRYOGENIC INSTRUMENT FOR THE RESTRUCTURED AXAF-S MISSION SO ADVANCES IN CRYOGENIC ENGINEERING, VOL 39, PTS A AND B SE ADVANCES IN CRYOGENIC ENGINEERING LA English DT Proceedings Paper CT 1993 Cryogenic Engineering Conference/International Cryogenic Materials Conference CY JUL 12-16, 1993 CL ALBUQUERQUE, NM SP BABCOCK & WILCOX, INT INST REFRIGERAT, COMMISS A C1 NASA,GODDARD SPACE FLIGHT CTR,CRYOGEN TECHNOL SECT,GREENBELT,MD 20771. NR 0 TC 3 Z9 3 U1 0 U2 0 PU PLENUM PRESS DIV PLENUM PUBLISHING CORP PI NEW YORK PA 233 SPRING ST, NEW YORK, NY 10013 SN 0065-2482 BN 0-306-44854-8 J9 ADV CRYOG ENG PY 1994 VL 39 BP 187 EP 192 PN A & B PG 6 WC Thermodynamics; Engineering, Electrical & Electronic; Physics, Condensed Matter SC Thermodynamics; Engineering; Physics GA BB12H UT WOS:A1994BB12H00022 ER PT S AU VOLZ, SM AF VOLZ, SM BE Kittel, P TI CRATE - A SUPERFLUID-HELIUM DEWAR FOR A SMALL EXPLORER (SMEX) SATELLITE SO ADVANCES IN CRYOGENIC ENGINEERING, VOL 39, PTS A AND B SE ADVANCES IN CRYOGENIC ENGINEERING LA English DT Proceedings Paper CT 1993 Cryogenic Engineering Conference/International Cryogenic Materials Conference CY JUL 12-16, 1993 CL ALBUQUERQUE, NM SP BABCOCK & WILCOX, INT INST REFRIGERAT, COMMISS A C1 NASA,GODDARD SPACE FLIGHT CTR,GREENBELT,MD 20771. NR 0 TC 0 Z9 0 U1 0 U2 0 PU PLENUM PRESS DIV PLENUM PUBLISHING CORP PI NEW YORK PA 233 SPRING ST, NEW YORK, NY 10013 SN 0065-2482 BN 0-306-44854-8 J9 ADV CRYOG ENG PY 1994 VL 39 BP 193 EP 200 PN A & B PG 8 WC Thermodynamics; Engineering, Electrical & Electronic; Physics, Condensed Matter SC Thermodynamics; Engineering; Physics GA BB12H UT WOS:A1994BB12H00023 ER PT S AU MASON, PV STRAYER, D PETRAC, D GUTT, G WARFIELD, K WORDEN, P TORII, R AF MASON, PV STRAYER, D PETRAC, D GUTT, G WARFIELD, K WORDEN, P TORII, R BE Kittel, P TI THE CONTROL OF LIQUID-HELIUM IN-SPACE BY ELECTROSTATICS FOR THE SATELLITE TEST OF EQUIVALENCE PRINCIPLE EXPERIMENT SO ADVANCES IN CRYOGENIC ENGINEERING, VOL 39, PTS A AND B SE ADVANCES IN CRYOGENIC ENGINEERING LA English DT Proceedings Paper CT 1993 Cryogenic Engineering Conference/International Cryogenic Materials Conference CY JUL 12-16, 1993 CL ALBUQUERQUE, NM SP BABCOCK & WILCOX, INT INST REFRIGERAT, COMMISS A C1 JET PROP LAB,PASADENA,CA 91109. NR 0 TC 1 Z9 1 U1 0 U2 0 PU PLENUM PRESS DIV PLENUM PUBLISHING CORP PI NEW YORK PA 233 SPRING ST, NEW YORK, NY 10013 SN 0065-2482 BN 0-306-44854-8 J9 ADV CRYOG ENG PY 1994 VL 39 BP 209 EP 217 PN A & B PG 9 WC Thermodynamics; Engineering, Electrical & Electronic; Physics, Condensed Matter SC Thermodynamics; Engineering; Physics GA BB12H UT WOS:A1994BB12H00025 ER PT S AU SHIRRON, PJ DIPIRRO, MJ TUTTLE, JG AF SHIRRON, PJ DIPIRRO, MJ TUTTLE, JG BE Kittel, P TI PERFORMANCE OF DISCRETE LIQUID HELIUM/VAPOR AND HE-I/HE-II DISCRIMINATORS SO ADVANCES IN CRYOGENIC ENGINEERING, VOL 39, PTS A AND B SE ADVANCES IN CRYOGENIC ENGINEERING LA English DT Proceedings Paper CT 1993 Cryogenic Engineering Conference/International Cryogenic Materials Conference CY JUL 12-16, 1993 CL ALBUQUERQUE, NM SP BABCOCK & WILCOX, INT INST REFRIGERAT, COMMISS A C1 NASA,GODDARD SPACE FLIGHT CTR,GREENBELT,MD 20771. NR 0 TC 1 Z9 1 U1 0 U2 0 PU PLENUM PRESS DIV PLENUM PUBLISHING CORP PI NEW YORK PA 233 SPRING ST, NEW YORK, NY 10013 SN 0065-2482 BN 0-306-44854-8 J9 ADV CRYOG ENG PY 1994 VL 39 BP 1105 EP 1112 PN A & B PG 8 WC Thermodynamics; Engineering, Electrical & Electronic; Physics, Condensed Matter SC Thermodynamics; Engineering; Physics GA BB12H UT WOS:A1994BB12H00135 ER PT S AU WARNER, BA BREON, SR AF WARNER, BA BREON, SR BE Kittel, P TI ELECTROMAGNETIC-INTERFERENCE (EMI) AND THERMAL STUDIES OF FLAT CONDUCTOR CABLE (FCC) SO ADVANCES IN CRYOGENIC ENGINEERING, VOL 39, PTS A AND B SE ADVANCES IN CRYOGENIC ENGINEERING LA English DT Proceedings Paper CT 1993 Cryogenic Engineering Conference/International Cryogenic Materials Conference CY JUL 12-16, 1993 CL ALBUQUERQUE, NM SP BABCOCK & WILCOX, INT INST REFRIGERAT, COMMISS A C1 NASA,GODDARD SPACE FLIGHT CTR,CRYOGEN SECT,GREENBELT,MD 20771. NR 0 TC 4 Z9 4 U1 0 U2 0 PU PLENUM PRESS DIV PLENUM PUBLISHING CORP PI NEW YORK PA 233 SPRING ST, NEW YORK, NY 10013 SN 0065-2482 BN 0-306-44854-8 J9 ADV CRYOG ENG PY 1994 VL 39 BP 1161 EP 1168 PN A & B PG 8 WC Thermodynamics; Engineering, Electrical & Electronic; Physics, Condensed Matter SC Thermodynamics; Engineering; Physics GA BB12H UT WOS:A1994BB12H00142 ER PT S AU SPARR, L BOYLE, R NGUYEN, L FRISCH, H BANKS, S JAMES, E ARILLO, V AF SPARR, L BOYLE, R NGUYEN, L FRISCH, H BANKS, S JAMES, E ARILLO, V BE Kittel, P TI DESIGN AND TEST OF POTENTIAL CRYOCOOLER COLD FINGER INTERFACES SO ADVANCES IN CRYOGENIC ENGINEERING, VOL 39, PTS A AND B SE ADVANCES IN CRYOGENIC ENGINEERING LA English DT Proceedings Paper CT 1993 Cryogenic Engineering Conference/International Cryogenic Materials Conference CY JUL 12-16, 1993 CL ALBUQUERQUE, NM SP BABCOCK & WILCOX, INT INST REFRIGERAT, COMMISS A C1 NASA,GODDARD SPACE FLIGHT CTR,CRYOGEN PROPULS & FLUID SYST BRANCH,GREENBELT,MD 20771. NR 0 TC 3 Z9 3 U1 0 U2 0 PU PLENUM PRESS DIV PLENUM PUBLISHING CORP PI NEW YORK PA 233 SPRING ST, NEW YORK, NY 10013 SN 0065-2482 BN 0-306-44854-8 J9 ADV CRYOG ENG PY 1994 VL 39 BP 1253 EP 1262 PN A & B PG 10 WC Thermodynamics; Engineering, Electrical & Electronic; Physics, Condensed Matter SC Thermodynamics; Engineering; Physics GA BB12H UT WOS:A1994BB12H00154 ER PT S AU WADE, LA WU, JJ BARD, S FLANAGAN, TB CLEWLEY, JD LOU, S AF WADE, LA WU, JJ BARD, S FLANAGAN, TB CLEWLEY, JD LOU, S BE Kittel, P TI PERFORMANCE, RELIABILITY, AND LIFE OF HYDRIDE COMPRESSOR COMPONENTS FOR 10-K TO 30-K SORPTION CRYOCOOLERS SO ADVANCES IN CRYOGENIC ENGINEERING, VOL 39, PTS A AND B SE ADVANCES IN CRYOGENIC ENGINEERING LA English DT Proceedings Paper CT 1993 Cryogenic Engineering Conference/International Cryogenic Materials Conference CY JUL 12-16, 1993 CL ALBUQUERQUE, NM SP BABCOCK & WILCOX, INT INST REFRIGERAT, COMMISS A C1 JET PROP LAB,PASADENA,CA 91109. NR 0 TC 9 Z9 9 U1 0 U2 0 PU PLENUM PRESS DIV PLENUM PUBLISHING CORP PI NEW YORK PA 233 SPRING ST, NEW YORK, NY 10013 SN 0065-2482 BN 0-306-44854-8 J9 ADV CRYOG ENG PY 1994 VL 39 BP 1483 EP 1490 PN A & B PG 8 WC Thermodynamics; Engineering, Electrical & Electronic; Physics, Condensed Matter SC Thermodynamics; Engineering; Physics GA BB12H UT WOS:A1994BB12H00182 ER PT S AU WADE, LA BOWMAN, RC GILKINSON, DR SYWULKA, PH AF WADE, LA BOWMAN, RC GILKINSON, DR SYWULKA, PH BE Kittel, P TI DEVELOPMENT OF SORBENT BED ASSEMBLY FOR A PERIODIC 10-K SOLID HYDROGEN CRYOCOOLER SO ADVANCES IN CRYOGENIC ENGINEERING, VOL 39, PTS A AND B SE ADVANCES IN CRYOGENIC ENGINEERING LA English DT Proceedings Paper CT 1993 Cryogenic Engineering Conference/International Cryogenic Materials Conference CY JUL 12-16, 1993 CL ALBUQUERQUE, NM SP BABCOCK & WILCOX, INT INST REFRIGERAT, COMMISS A C1 JET PROP LAB,PASADENA,CA 91109. NR 0 TC 8 Z9 8 U1 0 U2 0 PU PLENUM PRESS DIV PLENUM PUBLISHING CORP PI NEW YORK PA 233 SPRING ST, NEW YORK, NY 10013 SN 0065-2482 BN 0-306-44854-8 J9 ADV CRYOG ENG PY 1994 VL 39 BP 1491 EP 1498 PN A & B PG 8 WC Thermodynamics; Engineering, Electrical & Electronic; Physics, Condensed Matter SC Thermodynamics; Engineering; Physics GA BB12H UT WOS:A1994BB12H00183 ER PT S AU WU, JJ BARD, S BOULTER, W RODRIGUEZ, J LONGSWORTH, R AF WU, JJ BARD, S BOULTER, W RODRIGUEZ, J LONGSWORTH, R BE Kittel, P TI EXPERIMENTAL DEMONSTRATION OF A 10-K SORPTION CRYOCOOLER STAGE SO ADVANCES IN CRYOGENIC ENGINEERING, VOL 39, PTS A AND B SE ADVANCES IN CRYOGENIC ENGINEERING LA English DT Proceedings Paper CT 1993 Cryogenic Engineering Conference/International Cryogenic Materials Conference CY JUL 12-16, 1993 CL ALBUQUERQUE, NM SP BABCOCK & WILCOX, INT INST REFRIGERAT, COMMISS A C1 JET PROP LAB,PASADENA,CA 91109. NR 0 TC 5 Z9 5 U1 0 U2 0 PU PLENUM PRESS DIV PLENUM PUBLISHING CORP PI NEW YORK PA 233 SPRING ST, NEW YORK, NY 10013 SN 0065-2482 BN 0-306-44854-8 J9 ADV CRYOG ENG PY 1994 VL 39 BP 1507 EP 1514 PN A & B PG 8 WC Thermodynamics; Engineering, Electrical & Electronic; Physics, Condensed Matter SC Thermodynamics; Engineering; Physics GA BB12H UT WOS:A1994BB12H00185 ER PT S AU VANDRESAR, NT HABERBUSCH, MS AF VANDRESAR, NT HABERBUSCH, MS BE Kittel, P TI THERMODYNAMIC MODELS FOR BOUNDING PRESSURANT MASS REQUIREMENTS OF CRYOGENIC TANKS SO ADVANCES IN CRYOGENIC ENGINEERING, VOL 39, PTS A AND B SE ADVANCES IN CRYOGENIC ENGINEERING LA English DT Proceedings Paper CT 1993 Cryogenic Engineering Conference/International Cryogenic Materials Conference CY JUL 12-16, 1993 CL ALBUQUERQUE, NM SP BABCOCK & WILCOX, INT INST REFRIGERAT, COMMISS A C1 NASA,LEWIS RES CTR,CLEVELAND,OH 44135. NR 0 TC 0 Z9 0 U1 0 U2 0 PU PLENUM PRESS DIV PLENUM PUBLISHING CORP PI NEW YORK PA 233 SPRING ST, NEW YORK, NY 10013 SN 0065-2482 BN 0-306-44854-8 J9 ADV CRYOG ENG PY 1994 VL 39 BP 1907 EP 1914 PN A & B PG 8 WC Thermodynamics; Engineering, Electrical & Electronic; Physics, Condensed Matter SC Thermodynamics; Engineering; Physics GA BB12H UT WOS:A1994BB12H00233 ER PT S AU LYSEK, MJ STRAYER, DM AF LYSEK, MJ STRAYER, DM BE Kittel, P TI A TEST OF COMMERCIAL SQUID SYSTEMS FOR RESPONSE TO EMI AND TEMPERATURE-CHANGES SO ADVANCES IN CRYOGENIC ENGINEERING, VOL 39, PTS A AND B SE ADVANCES IN CRYOGENIC ENGINEERING LA English DT Proceedings Paper CT 1993 Cryogenic Engineering Conference/International Cryogenic Materials Conference CY JUL 12-16, 1993 CL ALBUQUERQUE, NM SP BABCOCK & WILCOX, INT INST REFRIGERAT, COMMISS A C1 JET PROP LAB,PASADENA,CA 91109. NR 0 TC 0 Z9 0 U1 0 U2 0 PU PLENUM PRESS DIV PLENUM PUBLISHING CORP PI NEW YORK PA 233 SPRING ST, NEW YORK, NY 10013 SN 0065-2482 BN 0-306-44854-8 J9 ADV CRYOG ENG PY 1994 VL 39 BP 2007 EP 2014 PN A & B PG 8 WC Thermodynamics; Engineering, Electrical & Electronic; Physics, Condensed Matter SC Thermodynamics; Engineering; Physics GA BB12H UT WOS:A1994BB12H00246 ER PT B AU WHITMORE, M MCKAY, TD MOUNT, FE AF WHITMORE, M MCKAY, TD MOUNT, FE BE Aghazadeh, F TI Evaluation of a microgravity workstation design: Spacelab glovebox SO ADVANCES IN INDUSTRIAL ERGONOMICS AND SAFETY VI SE ADVANCES IN INDUSTRIAL ERGONOMICS AND SAFETY LA English DT Proceedings Paper CT Annual International Industrial Ergonomics and Safety Conference CY JUN 07-10, 1994 CL SAN ANTONIO, TX SP Int Fdn Ind Ergon & Safety Res RP NASA,LYNDON B JOHNSON SPACE CTR,HUMAN FACTORS & ERGON LAB,HOUSTON,TX 77058, USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU TAYLOR & FRANCIS LTD PI LONDON PA 4 JOHN ST, LONDON, ENGLAND WC1N 2ET BN 0-7484-0085-0 J9 ADV IND ERG PY 1994 BP 385 EP 392 PG 8 WC Ergonomics SC Engineering GA BD37T UT WOS:A1994BD37T00057 ER PT B AU MCKAY, TD WHITMORE, M AF MCKAY, TD WHITMORE, M BE Aghazadeh, F TI An ergonomics case study: Manual material handling in microgravity SO ADVANCES IN INDUSTRIAL ERGONOMICS AND SAFETY VI SE ADVANCES IN INDUSTRIAL ERGONOMICS AND SAFETY LA English DT Proceedings Paper CT Annual International Industrial Ergonomics and Safety Conference CY JUN 07-10, 1994 CL SAN ANTONIO, TX SP Int Fdn Ind Ergon & Safety Res RP NASA,LYNDON B JOHNSON SPACE CTR,HUMAN FACTORS & ERGON LAB,HOUSTON,TX 77058, USA. NR 0 TC 0 Z9 0 U1 0 U2 1 PU TAYLOR & FRANCIS LTD PI LONDON PA 4 JOHN ST, LONDON, ENGLAND WC1N 2ET BN 0-7484-0085-0 J9 ADV IND ERG PY 1994 BP 409 EP 413 PG 5 WC Ergonomics SC Engineering GA BD37T UT WOS:A1994BD37T00060 ER PT B AU FAWCETT, SC AF FAWCETT, SC BE Hoover, RB Walker, ABC TI WOLTER-I X-RAY OPTICS PRODUCED BY DIAMOND TURNING AND REPLICATION SO ADVANCES IN MULTILAYER AND GRAZING INCIDENCE X-RAY/EUV/FUV OPTICS SE PROCEEDINGS OF THE SOCIETY OF PHOTO-OPTICAL INSTRUMENTATION ENGINEERS (SPIE) LA English DT Proceedings Paper CT Conference on Advances in Multilayer and Grazing Incidence X-Ray/EUV/FUV Optics CY JUL 24-26, 1994 CL SAN DIEGO, CA SP SOC PHOTO OPT INSTRUMENTAT ENGINEERS C1 NASA,GEORGE C MARSHALL SPACE FLIGHT CTR,OPT FABRICAT BRANCH,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 0-8194-1603-7 J9 P SOC PHOTO-OPT INS PY 1994 VL 2279 BP 27 EP 34 DI 10.1117/12.193136 PG 8 WC Astronomy & Astrophysics; Instruments & Instrumentation; Optics SC Astronomy & Astrophysics; Instruments & Instrumentation; Optics GA BC27K UT WOS:A1994BC27K00003 ER PT B AU SOUTAR, C MONROE, SE AF SOUTAR, C MONROE, SE BE Pape, DR TI SELECTION OF OPERATING CURVES OF TWISTED-NEMATIC LIQUID-CRYSTAL TELEVISIONS SO ADVANCES IN OPTICAL INFORMATION PROCESSING VI SE PROCEEDINGS OF THE SOCIETY OF PHOTO-OPTICAL INSTRUMENTATION ENGINEERS (SPIE) LA English DT Proceedings Paper CT 6th Conference on Advances in Optical Information Processing CY APR 06-07, 1994 CL ORLANDO, FL SP SOC PHOTO OPT INSTRUMENTAT ENGINEERS C1 NASA,JOHNSON SPACE CTR,DIV TRACKING & COMMUN,HOUSTON,TX 77058. NR 0 TC 8 Z9 8 U1 0 U2 0 PU SPIE - INT SOC OPTICAL ENGINEERING PI BELLINGHAM PA PO BOX 10, BELLINGHAM, WA 98227-0010 BN 0-8194-1544-X J9 P SOC PHOTO-OPT INS PY 1994 VL 2240 BP 280 EP 291 DI 10.1117/12.179133 PG 12 WC Optics SC Optics GA BA84F UT WOS:A1994BA84F00027 ER PT B AU NOOR, AK AF NOOR, AK BE Topping, BHV Papadrakakis, M TI NEW COMPUTING SYSTEMS, FUTURE HIGH PERFORMANCE COMPUTING ENVIRONMENTS AND THEIR IMPLICATIONS ON LARGE-SCALE PROBLEMS SO ADVANCES IN PARALLEL AND VECTOR PROCESSING FOR STRUCTURAL MECHANICS LA English DT Proceedings Paper CT 2nd International Conference on Computational Structures Technology CY AUG 30-SEP 01, 1994 CL ATHENS, GREECE SP Greek Assoc Comp Mech, Greek Minist Culture, Gen Secretariat Res & Technol Greece, Tourist Org Greece, Nato TU Athens, Univ Patras, Democritus Univ Thrace, Evgenidis Fdn, UNISYS Hellas C1 UNIV VIRGINIA,NASA,LANGLEY RES CTR,HAMPTON,VA. NR 0 TC 2 Z9 2 U1 0 U2 0 PU CIVIL COMP PRESS PI EDINBURGH PA 10 SAXE-COBURG PLACE, EDINBURGH, MIDLOTHIAN, SCOTLAND EH3 5BR BN 0-948749-22-9 PY 1994 BP 1 EP 22 PG 22 WC Computer Science, Theory & Methods; Engineering, Civil; Engineering, Mechanical SC Computer Science; Engineering GA BC30B UT WOS:A1994BC30B00001 ER PT J AU CARTER, DC HO, JX AF CARTER, DC HO, JX TI STRUCTURE OF SERUM-ALBUMIN SO ADVANCES IN PROTEIN CHEMISTRY, VOL 45 SE ADVANCES IN PROTEIN CHEMISTRY LA English DT Review ID AMINO-ACID SUBSTITUTIONS; GROUP-SPECIFIC COMPONENT; BOVINE PLASMA ALBUMIN; D-BINDING PROTEIN; NUCLEAR MAGNETIC-RESONANCE; COPPER(II) TRANSPORT SITE; N-F TRANSITION; ALPHA-FETOPROTEIN; GENETIC-VARIANTS; DRUG-BINDING RP CARTER, DC (reprint author), NASA,GEORGE C MARSHALL SPACE FLIGHT CTR,BIOPHYS BRANCH,SPACE SCI LAB,HUNTSVILLE,AL 35812, USA. NR 261 TC 2152 Z9 2186 U1 32 U2 233 PU ACADEMIC PRESS INC PI SAN DIEGO PA 525 B STREET, SUITE 1900, SAN DIEGO, CA 92101-4495 SN 0065-3233 J9 ADV PROTEIN CHEM JI Adv.Protein Chem. PY 1994 VL 45 BP 153 EP 203 PG 51 WC Biochemistry & Molecular Biology SC Biochemistry & Molecular Biology GA BA97M UT WOS:A1994BA97M00004 PM 8154369 ER PT S AU KISHONI, D AF KISHONI, D BE Maldague, XPV TI USE OF FINITE DIFFERENCE METHOD FOR PREDICTING PROPAGATION OF ULTRASONIC WAVES IN SOLIDS SO ADVANCES IN SIGNAL PROCESSING FOR NONDESTRUCTIVE EVALUATION OF MATERIALS SE NATO ADVANCED SCIENCE INSTITUTES SERIES, SERIES E, APPLIED SCIENCES LA English DT Proceedings Paper CT NATO Advanced Research Workshop on Advances in Signal Processing for Nondestructive Evaluation of Materials CY AUG 17-20, 1993 CL UNIV LAVAL, QUEBEC CITY, CANADA SP NATO HO UNIV LAVAL C1 NASA,LANGLEY RES CTR,COLL WILLIAM & MARY,HAMPTON,VA 23681. 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 0-7923-2765-9 J9 NATO ADV SCI INST SE PY 1994 VL 262 BP 185 EP 185 PG 1 WC Materials Science, Characterization & Testing SC Materials Science GA BC37N UT WOS:A1994BC37N00014 ER PT B AU GILES, GL AF GILES, GL BE Topping, BHV Papadrakakis, M TI DESIGN ORIENTED STRUCTURAL ANALYSIS SO ADVANCES IN STRUCTURAL ENGINEERING COMPUTING LA English DT Proceedings Paper CT 2nd International Conference on Computational Structures Technology CY AUG 30-SEP 01, 1994 CL ATHENS, GREECE SP Greek Assoc Comp Mech, Greek Minist Culture, Gen Secretariat Res & Technol Greece, Tourist Org Greece, Nato TU Athens, Univ Patras, Democritus Univ Thrace, Evgenidis Fdn, UNISYS Hellas C1 NASA,LANGLEY RES CTR,DIV STRUCT DYNAM,HAMPTON,VA 23665. NR 0 TC 0 Z9 0 U1 0 U2 0 PU CIVIL COMP PRESS PI EDINBURGH PA 10 SAXE-COBURG PLACE, EDINBURGH, MIDLOTHIAN, SCOTLAND EH3 5BR BN 0-948749-31-8 PY 1994 BP 1 EP 10 PG 10 WC Computer Science, Interdisciplinary Applications; Engineering, Civil SC Computer Science; Engineering GA BC23J UT WOS:A1994BC23J00001 ER PT J AU KOSTER, RD SUAREZ, MJ AF KOSTER, RD SUAREZ, MJ TI THE COMPONENTS OF A SVAT SCHEME AND THEIR EFFECTS ON A GCMS HYDROLOGICAL CYCLE SO ADVANCES IN WATER RESOURCES LA English DT Article; Proceedings Paper CT MIT Colloquium on Hydroclimatology and Global Hydrology CY APR 07-08, 1993 CL CAMBRIDGE, MA SP MIT AB 'Bucket'-type land surface models are being replaced in some general circulation model (GCM) climate studies by 'SVAT' (Surface Vegetation-Atmosphere Transfer) models, which feature an explicit treatment of vegetation control over the surface energy balance. The evaporation calculations of a typical SVAT model differ from those of a bucket model in at least four fundamental ways: (a) the SVAT model typically allows a greater variety of environmental stresses to limit evapotranspiration; (b) it generally includes a canopy interception reservoir; (c) the control of the land surface over evaporation in a SVAT model is influenced by the atmosphere; and (d) the land surface control in a SVAT model varies on short time scales. Global fields and grid square diurnal cycles illustrate the hydrological cycle produced in a 20-year simulation with an atmospheric GCM coupled to a SVAT model. A sensitivity analysis then examines the relative importance of the SVAT/bucket differences in terms of their effects on the simulated hydrological cycle. The interception reservoir exerts more control over global evaporation than does either the vapor pressure deficit stress or the temperature stress. The effect of the temperature stress is, in fact, insignificant. The time variability of land surface control over the surface energy balance in a SVAT model significantly increases moisture convergence over land. RP KOSTER, RD (reprint author), NASA,GODDARD SPACE FLIGHT CTR,GREENBELT,MD 20771, USA. RI Koster, Randal/F-5881-2012 OI Koster, Randal/0000-0001-6418-6383 NR 0 TC 51 Z9 52 U1 0 U2 5 PU ELSEVIER SCI LTD PI OXFORD PA THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD, OXON, ENGLAND OX5 1GB SN 0309-1708 J9 ADV WATER RESOUR JI Adv. Water Resour. PY 1994 VL 17 IS 1-2 BP 61 EP 78 DI 10.1016/0309-1708(94)90024-8 PG 18 WC Water Resources SC Water Resources GA PF515 UT WOS:A1994PF51500007 ER PT B AU NIKZAD, S HOENK, ME GRUNTHANER, PJ TERHUNE, RW GRUNTHANER, FJ WINZENREAD, R FATTAHI, M TSENG, HF AF NIKZAD, S HOENK, ME GRUNTHANER, PJ TERHUNE, RW GRUNTHANER, FJ WINZENREAD, R FATTAHI, M TSENG, HF BE Cindrich, I DelGrande, NK Gowrinathan, S Johnson, PB Shanley, JF TI DELTA-DOPED CCDS AS STABLE, HIGH-SENSITIVITY, HIGH-RESOLUTION UV IMAGING ARRAYS SO AERIAL SURVEILLANCE SENSING INCLUDING OBSCURED AND UNDERGROUND OBJECT DETECTION SE PROCEEDINGS OF THE SOCIETY OF PHOTO-OPTICAL INSTRUMENTATION ENGINEERS (SPIE) LA English DT Proceedings Paper CT Conference on Aerial Surveillance Sensing Including Obscured and Underground Object Detection CY APR 04-06, 1994 CL ORLANDO, FL SP SOC PHOTO OPT INSTRUMENTAT ENGINEERS C1 JET PROP LAB,CTR SPACE MICROELECTR TECHNOL,PASADENA,CA 91109. NR 0 TC 6 Z9 6 U1 0 U2 0 PU SPIE - INT SOC OPTICAL ENGINEERING PI BELLINGHAM PA PO BOX 10, BELLINGHAM, WA 98227-0010 BN 0-8194-1521-9 J9 P SOC PHOTO-OPT INS PY 1994 VL 2217 BP 355 EP 364 DI 10.1117/12.179949 PG 10 WC Remote Sensing; Optics SC Remote Sensing; Optics GA BB27M UT WOS:A1994BB27M00028 ER PT J AU HARRIS, WL AF HARRIS, WL TI TOWARD A NATIONAL AERONAUTICAL POLICY SO AEROSPACE AMERICA LA English DT Article RP HARRIS, WL (reprint author), NASA,OFF AERONAUT,WASHINGTON,DC 20546, 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 1994 VL 32 IS 1 BP B48 EP B48 PG 1 WC Engineering, Aerospace SC Engineering GA MQ799 UT WOS:A1994MQ79900013 ER PT B AU GEORGE, J KUNSTMANN, G SOUTHARD, S UPCHURCH, E AF GEORGE, J KUNSTMANN, G SOUTHARD, S UPCHURCH, E GP AIAA TI GALILEO SYSTEM DESIGN FOR ORBITAL OPERATIONS SO AIAA/IEEE DIGITAL AVIONICS SYSTEMS CONFERENCE - 13TH DASC LA English DT Proceedings Paper CT 13th AIAA/IEEE Digital Avionics Systems Conference (13th DASC) CY OCT 30-NOV 03, 1994 CL PHOENIX, AZ SP AIAA, IEEE 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 0-7803-2425-0 PY 1994 BP 40 EP 45 DI 10.1109/DASC.1994.369506 PG 6 WC Engineering, Aerospace SC Engineering GA BB78Z UT WOS:A1994BB78Z00008 ER PT B AU NJAKA, CE MENON, PK CHENG, VHL AF NJAKA, CE MENON, PK CHENG, VHL GP AIAA TI TOWARDS AN ADVANCED NONLINEAR ROTORCRAFT FLIGHT CONTROL SYSTEM DESIGN SO AIAA/IEEE DIGITAL AVIONICS SYSTEMS CONFERENCE - 13TH DASC LA English DT Proceedings Paper CT 13th AIAA/IEEE Digital Avionics Systems Conference (13th DASC) CY OCT 30-NOV 03, 1994 CL PHOENIX, AZ SP AIAA, 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 0-7803-2425-0 PY 1994 BP 190 EP 197 DI 10.1109/DASC.1994.369483 PG 8 WC Engineering, Aerospace SC Engineering GA BB78Z UT WOS:A1994BB78Z00031 ER PT B AU LEUNG, JGM WEI, MY AOYAGI, M AF LEUNG, JGM WEI, MY AOYAGI, M GP AIAA TI UH-60A AIRLOADS DATA ACQUISITION AND PROCESSING SYSTEM SO AIAA/IEEE DIGITAL AVIONICS SYSTEMS CONFERENCE - 13TH DASC LA English DT Proceedings Paper CT 13th AIAA/IEEE Digital Avionics Systems Conference (13th DASC) CY OCT 30-NOV 03, 1994 CL PHOENIX, AZ SP AIAA, IEEE C1 NASA,AMES RES CTR,RANGE SYST BRANCH,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 0-7803-2425-0 PY 1994 BP 206 EP 211 DI 10.1109/DASC.1994.369481 PG 6 WC Engineering, Aerospace SC Engineering GA BB78Z UT WOS:A1994BB78Z00033 ER PT B AU BROWN, TK DONALDSON, JA AF BROWN, TK DONALDSON, JA GP AIAA TI FAULT PROTECTION DESIGN FOR THE COMMAND AND DATA SUBSYSTEM ON THE CASSINI SPACECRAFT SO AIAA/IEEE DIGITAL AVIONICS SYSTEMS CONFERENCE - 13TH DASC LA English DT Proceedings Paper CT 13th AIAA/IEEE Digital Avionics Systems Conference (13th DASC) CY OCT 30-NOV 03, 1994 CL PHOENIX, AZ SP AIAA, IEEE 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 0-7803-2425-0 PY 1994 BP 408 EP 413 DI 10.1109/DASC.1994.369449 PG 6 WC Engineering, Aerospace SC Engineering GA BB78Z UT WOS:A1994BB78Z00065 ER PT B AU BATSON, VM HARRIS, RL HUNT, PJ AF BATSON, VM HARRIS, RL HUNT, PJ GP AIAA TI NAVIGATING THE AIRPORT SURFACE - ELECTRONIC VS PAPER MAPS SO AIAA/IEEE DIGITAL AVIONICS SYSTEMS CONFERENCE - 13TH DASC LA English DT Proceedings Paper CT 13th AIAA/IEEE Digital Avionics Systems Conference (13th DASC) CY OCT 30-NOV 03, 1994 CL PHOENIX, AZ SP AIAA, 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 0-7803-2425-0 PY 1994 BP 515 EP 520 DI 10.1109/DASC.1994.369431 PG 6 WC Engineering, Aerospace SC Engineering GA BB78Z UT WOS:A1994BB78Z00083 ER PT B AU JONES, DR YOUNG, SD AF JONES, DR YOUNG, SD GP AIAA TI ENHANCING PILOT SITUATIONAL AWARENESS OF THE AIRPORT SURFACE MOVEMENT AREA SO AIAA/IEEE DIGITAL AVIONICS SYSTEMS CONFERENCE - 13TH DASC LA English DT Proceedings Paper CT 13th AIAA/IEEE Digital Avionics Systems Conference (13th DASC) CY OCT 30-NOV 03, 1994 CL PHOENIX, AZ SP AIAA, IEEE C1 NASA,LANGLEY RES CTR,HAMPTON,VA 23665. 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 0-7803-2425-0 PY 1994 BP 539 EP 543 DI 10.1109/DASC.1994.369427 PG 5 WC Engineering, Aerospace SC Engineering GA BB78Z UT WOS:A1994BB78Z00087 ER PT B AU ISHMAEL, SD AF ISHMAEL, SD GP AIAA TI FLIGHT TEST OF A VISION DEVICE SO AIAA/IEEE DIGITAL AVIONICS SYSTEMS CONFERENCE - 13TH DASC LA English DT Proceedings Paper CT 13th AIAA/IEEE Digital Avionics Systems Conference (13th DASC) CY OCT 30-NOV 03, 1994 CL PHOENIX, AZ SP AIAA, IEEE C1 NASA,DRYDEN FLIGHT RES CTR,EDWARDS AFB,CA. 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 0-7803-2425-0 PY 1994 BP 590 EP 592 DI 10.1109/DASC.1994.369417 PG 3 WC Engineering, Aerospace SC Engineering GA BB78Z UT WOS:A1994BB78Z00097 ER PT B AU SHIGEMOTO, FH AF SHIGEMOTO, FH GP AIAA TI MOBILE FLIGHT TEST SUPPORT SO AIAA/IEEE DIGITAL AVIONICS SYSTEMS CONFERENCE - 13TH DASC LA English DT Proceedings Paper CT 13th AIAA/IEEE Digital Avionics Systems Conference (13th DASC) CY OCT 30-NOV 03, 1994 CL PHOENIX, AZ SP AIAA, IEEE C1 NASA,AMES RES CTR,RANGE SYST BRANCH,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 0-7803-2425-0 PY 1994 BP 593 EP 598 DI 10.1109/DASC.1994.369416 PG 6 WC Engineering, Aerospace SC Engineering GA BB78Z UT WOS:A1994BB78Z00098 ER PT J AU TURKEL, E VATSA, VN AF TURKEL, E VATSA, VN TI EFFECT OF ARTIFICIAL VISCOSITY ON 3-DIMENSIONAL FLOW SOLUTIONS SO AIAA JOURNAL LA English DT Article AB Artificial viscosity is added either implicitly or explicitly in practically every numerical scheme for suppressing spurious oscillations in the solution of fluid-dynamics equations. In the present central-difference scheme, artificial viscosity Is added explicitly for suppressing high-frequency oscillations and achieving good convergence properties. The amount of artificial viscosity added is controlled through the use of preselected coefficients. In the standard scheme, scalar coefficients based on the spectral radii of the Jacobian of the convective fluxes are used. However, this can add too much viscosity to the slower waves. Hence, the use of matrix-valued coefficients, which give appropriate viscosity for each wave component, is suggested. With the matrix-valued coefficients, the central-difference scheme produces more accurate solutions on a given grid, particularly in the vicinity of shocks and boundary layers, while still maintaining good convergence properties. C1 NASA,LANGLEY RES CTR,HAMPTON,VA 23681. RP TURKEL, E (reprint author), TEL AVIV UNIV,TEL AVIV,ISRAEL. NR 14 TC 34 Z9 36 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 1994 VL 32 IS 1 BP 39 EP 45 DI 10.2514/3.11948 PG 7 WC Engineering, Aerospace SC Engineering GA MQ447 UT WOS:A1994MQ44700006 ER PT J AU RICHASON, TF KATZ, J ASHBY, DL AF RICHASON, TF KATZ, J ASHBY, DL TI UNSTEADY PANEL METHOD FOR FLOWS WITH MULTIPLE BODIES MOVING ALONG VARIOUS PATHS SO AIAA JOURNAL LA English DT Article AB A potential flow based three-dimensional panel method was modified to treat time-dependent conditions in which several submerged bodies can move within the fluid along different trajectories. This modification was accomplished by formulating the momentary solution in an inertial frame of reference, attached to the undisturbed stationary fluid. Consequently, the numerical interpretation of the multiple body, solid-surface boundary condition and the viscous wake rollup was considerably simplified. The unsteady capability of this code was calibrated and validated by comparing computed results with closed-form analytical results available for an airfoil, which was impulsively set into a constant speed forward motion. To demonstrate the multicomponent capability, computations were made for two wings following closely intersecting paths (i.e., simulations aimed at avoiding mid-air collisions) and for a flowfield with relative rotation (i.e., the case of a helicopter rotor rotating relative to the fuselage). Computed results for the cases were compared to experimental data, when such data was available. C1 NASA,AMES RES CTR,FIXED WING AERODYNAM BRANCH,MOFFETT FIELD,CA 94035. RP RICHASON, TF (reprint author), SAN DIEGO STATE UNIV,DEPT AEROSP ENGN & ENGN MECH,SAN DIEGO,CA 92182, USA. NR 12 TC 9 Z9 11 U1 2 U2 2 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 1994 VL 32 IS 1 BP 62 EP 68 DI 10.2514/3.11951 PG 7 WC Engineering, Aerospace SC Engineering GA MQ447 UT WOS:A1994MQ44700009 ER PT J AU ADMIRE, JR TINKER, ML IVEY, EW AF ADMIRE, JR TINKER, ML IVEY, EW TI RESIDUAL FLEXIBILITY TEST METHOD FOR VERIFICATION OF CONSTRAINED STRUCTURAL MODELS SO AIAA JOURNAL LA English DT Article AB A method is described for deriving constrained modes and frequencies from a reduced model based on a subset of the free free modes plus the residual effects of neglected modes. The method involves a simple modification of the MacNeal and Rubin component mode representation to allow development of a verified constrained (filed-base) structural model. Results for two spaceflight structures having translational boundary degrees of freedom show quick convergence of constrained modes using a measurable number of free-free modes plus the boundary partition of the residual flexibility matrix. This paper presents the free-free residual flexibility approach as an alternative test/analysis method when fixed-base testing proves impractical. RP ADMIRE, JR (reprint author), NASA,MARSHALL SPACE FLIGHT CTR,HUNTSVILLE,AL 35812, USA. NR 15 TC 17 Z9 17 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 1994 VL 32 IS 1 BP 170 EP 175 DI 10.2514/3.11963 PG 6 WC Engineering, Aerospace SC Engineering GA MQ447 UT WOS:A1994MQ44700021 ER PT J AU SINGH, DJ JACHIMOWSKI, CJ AF SINGH, DJ JACHIMOWSKI, CJ TI QUASI-GLOBAL REACTION MODEL FOR ETHYLENE COMBUSTION SO AIAA JOURNAL LA English DT Note ID OXIDATION C1 NASA,LANGLEY RES CTR,DIV FLUID MECH,HYPERSON PROP BRANCH,HAMPTON,VA 23681. RP SINGH, DJ (reprint author), ANALYT SERV & MAT INC,107 RES DR,HAMPTON,VA 23666, USA. NR 4 TC 14 Z9 16 U1 1 U2 4 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 1994 VL 32 IS 1 BP 213 EP 216 DI 10.2514/3.11972 PG 4 WC Engineering, Aerospace SC Engineering GA MQ447 UT WOS:A1994MQ44700030 ER PT B AU HAMILTON, MK PILORZ, SH DAVIS, CO VANDENBOSCH, JM RHEA, WJ AF HAMILTON, MK PILORZ, SH DAVIS, CO VANDENBOSCH, JM RHEA, WJ BE Iverson, AE TI ANALYSIS OF HIGH-SPECTRAL-RESOLUTION COASTAL OCEAN IMAGERY - STATISTICAL, EMPIRICAL, AND ANALYTICAL INVESTIGATIONS SO ALGORITHMS FOR MULTISPECTRAL AND HYPERSPECTRAL IMAGERY SE PROCEEDINGS OF THE SOCIETY OF PHOTO-OPTICAL INSTRUMENTATION ENGINEERS (SPIE) LA English DT Proceedings Paper CT Conference on Algorithms for Multispectral and Hyperspectral Imagery CY APR 05, 1994 CL ORLANDO, FL SP SOC PHOTO OPT INSTRUMENTAT ENGINEERS C1 JET PROP LAB,PASADENA,CA 91109. NR 0 TC 1 Z9 1 U1 0 U2 1 PU SPIE - INT SOC OPTICAL ENGINEERING PI BELLINGHAM PA PO BOX 10, BELLINGHAM, WA 98227-0010 BN 0-8194-1535-9 J9 P SOC PHOTO-OPT INS PY 1994 VL 2231 BP 116 EP 126 DI 10.1117/12.179772 PG 11 WC Computer Science, Software Engineering; Remote Sensing; Optics SC Computer Science; Remote Sensing; Optics GA BB06Y UT WOS:A1994BB06Y00012 ER PT B AU CHENG, LJ HAMILTON, M MAHONEY, C REYES, G AF CHENG, LJ HAMILTON, M MAHONEY, C REYES, G BE Iverson, AE TI ANALYSIS OF AOTF HYPERSPECTRAL IMAGERY SO ALGORITHMS FOR MULTISPECTRAL AND HYPERSPECTRAL IMAGERY SE PROCEEDINGS OF THE SOCIETY OF PHOTO-OPTICAL INSTRUMENTATION ENGINEERS (SPIE) LA English DT Proceedings Paper CT Conference on Algorithms for Multispectral and Hyperspectral Imagery CY APR 05, 1994 CL ORLANDO, FL SP SOC PHOTO OPT INSTRUMENTAT ENGINEERS C1 JET PROP LAB,PASADENA,CA 91109. NR 0 TC 8 Z9 8 U1 0 U2 2 PU SPIE - INT SOC OPTICAL ENGINEERING PI BELLINGHAM PA PO BOX 10, BELLINGHAM, WA 98227-0010 BN 0-8194-1535-9 J9 P SOC PHOTO-OPT INS PY 1994 VL 2231 BP 158 EP 166 DI 10.1117/12.179776 PG 9 WC Computer Science, Software Engineering; Remote Sensing; Optics SC Computer Science; Remote Sensing; Optics GA BB06Y UT WOS:A1994BB06Y00016 ER PT B AU GREEN, RO HELMLINGER, MC CONEL, JE VANDENBOSCH, J AF GREEN, RO HELMLINGER, MC CONEL, JE VANDENBOSCH, J BE Iverson, AE TI INFLIGHT VALIDATION OF THE CALIBRATION OF AIRBORNE VISIBLE INFRARED IMAGING SPECTROMETER IN 1993 SO ALGORITHMS FOR MULTISPECTRAL AND HYPERSPECTRAL IMAGERY SE PROCEEDINGS OF THE SOCIETY OF PHOTO-OPTICAL INSTRUMENTATION ENGINEERS (SPIE) LA English DT Proceedings Paper CT Conference on Algorithms for Multispectral and Hyperspectral Imagery CY APR 05, 1994 CL ORLANDO, FL SP SOC PHOTO OPT INSTRUMENTAT ENGINEERS C1 JET PROP LAB,PASADENA,CA 91109. NR 0 TC 2 Z9 2 U1 0 U2 1 PU SPIE - INT SOC OPTICAL ENGINEERING PI BELLINGHAM PA PO BOX 10, BELLINGHAM, WA 98227-0010 BN 0-8194-1535-9 J9 P SOC PHOTO-OPT INS PY 1994 VL 2231 BP 177 EP 185 DI 10.1117/12.179779 PG 9 WC Computer Science, Software Engineering; Remote Sensing; Optics SC Computer Science; Remote Sensing; Optics GA BB06Y UT WOS:A1994BB06Y00018 ER PT B AU VANDENBOSCH, JM GREEN, RO CONEL, JE SHIMADA, M AF VANDENBOSCH, JM GREEN, RO CONEL, JE SHIMADA, M BE Iverson, AE TI CALIBRATION OF THE JAPANESE EARTH RESOURCES SATELLITE-1 OPTICAL SENSOR USING THE AIRBORNE VISIBLE-INFRARED IMAGING SPECTROMETER SO ALGORITHMS FOR MULTISPECTRAL AND HYPERSPECTRAL IMAGERY SE PROCEEDINGS OF THE SOCIETY OF PHOTO-OPTICAL INSTRUMENTATION ENGINEERS (SPIE) LA English DT Proceedings Paper CT Conference on Algorithms for Multispectral and Hyperspectral Imagery CY APR 05, 1994 CL ORLANDO, FL SP SOC PHOTO OPT INSTRUMENTAT ENGINEERS 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 0-8194-1535-9 J9 P SOC PHOTO-OPT INS PY 1994 VL 2231 BP 186 EP 190 DI 10.1117/12.179780 PG 5 WC Computer Science, Software Engineering; Remote Sensing; Optics SC Computer Science; Remote Sensing; Optics GA BB06Y UT WOS:A1994BB06Y00019 ER PT J AU WASHINO, RK WOOD, BL AF WASHINO, RK WOOD, BL TI APPLICATION OF REMOTE-SENSING TO ARTHROPOD VECTOR SURVEILLANCE AND CONTROL SO AMERICAN JOURNAL OF TROPICAL MEDICINE AND HYGIENE LA English DT Article; Proceedings Paper CT Symposium on Prevention of Tropical Diseases: Status of New and Emerging Vector Control Strategies, at the 40th Annual Meeting of the American-Society-of-Tropical-Medicine-and-Hygiene CY DEC 02, 1991 CL BOSTON, MA SP AMER SOC TROP MED & HYGIENE, AMER COMM MED ENTOMOL ID COLUMBIAE OVIPOSITION HABITATS; COLOR INFRARED PHOTOGRAPHY; TEXAS RICELANDS; LANDSAT-TM; IDENTIFICATION; IMAGERY AB A need exists to further develop new technologies, such as remote sensing and geographic information systems analysis, for estimating arthropod vector abundance in aquatic habitats and predicting adult vector population outbreaks. A brief overview of remote sensing technology in vector surveillance and control is presented, and suggestions are made on future research opportunities in light of current and proposed remote sensing systems. C1 NASA,AMES RES CTR,JOHNSON CONTROLS WORLD SERV INC,MOFFETT FIELD,CA 94035. RP WASHINO, RK (reprint author), UNIV CALIF DAVIS,DEPT ENTOMOL,DAVIS,CA 95616, USA. NR 32 TC 54 Z9 61 U1 1 U2 2 PU AMER SOC TROP MED & HYGIENE PI MCLEAN PA 8000 WESTPARK DRIVE SUITE 130, MCLEAN, VA 22101 SN 0002-9637 J9 AM J TROP MED HYG JI Am. J. Trop. Med. Hyg. PY 1994 VL 50 IS 6 SU S BP 134 EP 144 PG 11 WC Public, Environmental & Occupational Health; Tropical Medicine SC Public, Environmental & Occupational Health; Tropical Medicine GA NX799 UT WOS:A1994NX79900014 PM 8024079 ER PT B AU GURSEL, Y AF GURSEL, Y BE Breckinridge, JB TI METROLOGY FOR SPATIAL INTERFEROMETRY SO AMPLITUDE AND INTENSITY SPATIAL INTERFEROMETRY II SE PROCEEDINGS OF THE SOCIETY OF PHOTO-OPTICAL INSTRUMENTATION ENGINEERS (SPIE) LA English DT Proceedings Paper CT Conference on Amplitude and Intensity Spatial Interferometry II CY MAR 15-16, 1994 CL KONA, HI SP SOC PHOTO OPT INSTRUMENTAT ENGINEERS, AMER ASTRONOM SOC, ASTRON SOC PACIFIC, EUROPEAN ASTRON SOC, OPT SOC AMER C1 JET PROP LAB,PASADENA,CA 91109. NR 0 TC 12 Z9 12 U1 0 U2 0 PU SPIE - INT SOC OPTICAL ENGINEERING PI BELLINGHAM PA PO BOX 10, BELLINGHAM, WA 98227-0010 BN 0-8194-1495-6 J9 P SOC PHOTO-OPT INS PY 1994 VL 2200 BP 27 EP 34 DI 10.1117/12.177268 PG 8 WC Astronomy & Astrophysics; Instruments & Instrumentation; Optics SC Astronomy & Astrophysics; Instruments & Instrumentation; Optics GA BA83M UT WOS:A1994BA83M00003 ER PT B AU COLAVITA, MM SHAO, M HINES, BE WALLACE, JK GURSEL, Y MALBET, F YU, JW SINGH, H BEICHMAN, CA PAN, XP NAKAJIMA, T KULKARNI, SR AF COLAVITA, MM SHAO, M HINES, BE WALLACE, JK GURSEL, Y MALBET, F YU, JW SINGH, H BEICHMAN, CA PAN, XP NAKAJIMA, T KULKARNI, SR BE Breckinridge, JB TI ASEPS-0 TESTBED INTERFEROMETER SO AMPLITUDE AND INTENSITY SPATIAL INTERFEROMETRY II SE PROCEEDINGS OF THE SOCIETY OF PHOTO-OPTICAL INSTRUMENTATION ENGINEERS (SPIE) LA English DT Proceedings Paper CT Conference on Amplitude and Intensity Spatial Interferometry II CY MAR 15-16, 1994 CL KONA, HI SP SOC PHOTO OPT INSTRUMENTAT ENGINEERS, AMER ASTRONOM SOC, ASTRON SOC PACIFIC, EUROPEAN ASTRON SOC, OPT SOC AMER C1 JET PROP LAB,PASADENA,CA 91109. NR 0 TC 14 Z9 14 U1 1 U2 1 PU SPIE - INT SOC OPTICAL ENGINEERING PI BELLINGHAM PA PO BOX 10, BELLINGHAM, WA 98227-0010 BN 0-8194-1495-6 J9 P SOC PHOTO-OPT INS PY 1994 VL 2200 BP 89 EP 97 DI 10.1117/12.177230 PG 9 WC Astronomy & Astrophysics; Instruments & Instrumentation; Optics SC Astronomy & Astrophysics; Instruments & Instrumentation; Optics GA BA83M UT WOS:A1994BA83M00010 ER PT B AU HINES, B AF HINES, B BE Breckinridge, JB TI ASEPS-0 TESTBED INTERFEROMETER CONTROL-SYSTEM SO AMPLITUDE AND INTENSITY SPATIAL INTERFEROMETRY II SE PROCEEDINGS OF THE SOCIETY OF PHOTO-OPTICAL INSTRUMENTATION ENGINEERS (SPIE) LA English DT Proceedings Paper CT Conference on Amplitude and Intensity Spatial Interferometry II CY MAR 15-16, 1994 CL KONA, HI SP SOC PHOTO OPT INSTRUMENTAT ENGINEERS, AMER ASTRONOM SOC, ASTRON SOC PACIFIC, EUROPEAN ASTRON SOC, OPT SOC AMER C1 JET PROP LAB,PASADENA,CA 91109. 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 0-8194-1495-6 J9 P SOC PHOTO-OPT INS PY 1994 VL 2200 BP 98 EP 109 DI 10.1117/12.177231 PG 12 WC Astronomy & Astrophysics; Instruments & Instrumentation; Optics SC Astronomy & Astrophysics; Instruments & Instrumentation; Optics GA BA83M UT WOS:A1994BA83M00011 ER PT B AU TREUHAFT, RN LOWE, ST BESTER, M DANCHI, WC TOWNES, CH AF TREUHAFT, RN LOWE, ST BESTER, M DANCHI, WC TOWNES, CH BE Breckinridge, JB TI TOWARD 10-MILLIARCSECOND INFRARED ASTROMETRY SO AMPLITUDE AND INTENSITY SPATIAL INTERFEROMETRY II SE PROCEEDINGS OF THE SOCIETY OF PHOTO-OPTICAL INSTRUMENTATION ENGINEERS (SPIE) LA English DT Proceedings Paper CT Conference on Amplitude and Intensity Spatial Interferometry II CY MAR 15-16, 1994 CL KONA, HI SP SOC PHOTO OPT INSTRUMENTAT ENGINEERS, AMER ASTRONOM SOC, ASTRON SOC PACIFIC, EUROPEAN ASTRON SOC, OPT SOC AMER 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 0-8194-1495-6 J9 P SOC PHOTO-OPT INS PY 1994 VL 2200 BP 316 EP 324 DI 10.1117/12.177249 PG 9 WC Astronomy & Astrophysics; Instruments & Instrumentation; Optics SC Astronomy & Astrophysics; Instruments & Instrumentation; Optics GA BA83M UT WOS:A1994BA83M00030 ER PT B AU YU, J SHAO, M GURSEL, Y HELLINGS, R AF YU, J SHAO, M GURSEL, Y HELLINGS, R BE Breckinridge, JB TI LATOR - LASER ASTROMETRIC TEST OF RELATIVITY SO AMPLITUDE AND INTENSITY SPATIAL INTERFEROMETRY II SE PROCEEDINGS OF THE SOCIETY OF PHOTO-OPTICAL INSTRUMENTATION ENGINEERS (SPIE) LA English DT Proceedings Paper CT Conference on Amplitude and Intensity Spatial Interferometry II CY MAR 15-16, 1994 CL KONA, HI SP SOC PHOTO OPT INSTRUMENTAT ENGINEERS, AMER ASTRONOM SOC, ASTRON SOC PACIFIC, EUROPEAN ASTRON SOC, OPT SOC AMER C1 JET PROP LAB,PASADENA,CA 91109. NR 0 TC 2 Z9 2 U1 0 U2 0 PU SPIE - INT SOC OPTICAL ENGINEERING PI BELLINGHAM PA PO BOX 10, BELLINGHAM, WA 98227-0010 BN 0-8194-1495-6 J9 P SOC PHOTO-OPT INS PY 1994 VL 2200 BP 325 EP 334 DI 10.1117/12.177250 PG 10 WC Astronomy & Astrophysics; Instruments & Instrumentation; Optics SC Astronomy & Astrophysics; Instruments & Instrumentation; Optics GA BA83M UT WOS:A1994BA83M00031 ER PT S AU HANNER, MS AF HANNER, MS BE Zolensky, ME Wilson, TL Rietmeijer, FJM Flynn, GJ TI REMOTE-SENSING OF COMETARY DUST AND COMPARISONS TO IDPS SO ANALYSIS OF INTERPLANETARY DUST SE AIP CONFERENCE PROCEEDINGS LA English DT Proceedings Paper CT NASA/LPI Workshop on the Analysis of Interplanetary Dust CY MAY 15-17, 1993 CL LUNAR & PLANETARY INST, HOUSTON, TX SP NASA, LUNAR & PLANETARY INST HO LUNAR & PLANETARY INST 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 1-56396-341-8 J9 AIP CONF PROC PY 1994 IS 310 BP 23 EP 32 PG 10 WC Astronomy & Astrophysics; Geosciences, Multidisciplinary SC Astronomy & Astrophysics; Geology GA BB16K UT WOS:A1994BB16K00003 ER PT S AU WILSON, TL AF WILSON, TL BE Zolensky, ME Wilson, TL Rietmeijer, FJM Flynn, GJ TI VOLCANISM AND LEVITATION - UNUSUAL ORIGINS OF INTERPLANETARY DUST SO ANALYSIS OF INTERPLANETARY DUST SE AIP CONFERENCE PROCEEDINGS LA English DT Proceedings Paper CT NASA/LPI Workshop on the Analysis of Interplanetary Dust CY MAY 15-17, 1993 CL LUNAR & PLANETARY INST, HOUSTON, TX SP NASA, LUNAR & PLANETARY INST HO LUNAR & PLANETARY INST C1 NASA,LYNDON B JOHNSON SPACE CTR,HOUSTON,TX 77058. 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 1-56396-341-8 J9 AIP CONF PROC PY 1994 IS 310 BP 33 EP 44 PG 12 WC Astronomy & Astrophysics; Geosciences, Multidisciplinary SC Astronomy & Astrophysics; Geology GA BB16K UT WOS:A1994BB16K00004 ER PT S AU ZOLENSKY, M BARRETT, R AF ZOLENSKY, M BARRETT, R BE Zolensky, ME Wilson, TL Rietmeijer, FJM Flynn, GJ TI OLIVINE AND PYROXENE COMPOSITIONS OF CHONDRITIC INTERPLANETARY DUST PARTICLES SO ANALYSIS OF INTERPLANETARY DUST SE AIP CONFERENCE PROCEEDINGS LA English DT Proceedings Paper CT NASA/LPI Workshop on the Analysis of Interplanetary Dust CY MAY 15-17, 1993 CL LUNAR & PLANETARY INST, HOUSTON, TX SP NASA, LUNAR & PLANETARY INST HO LUNAR & PLANETARY INST C1 NASA,LYNDON B JOHNSON SPACE CTR,HOUSTON,TX 77058. 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 1-56396-341-8 J9 AIP CONF PROC PY 1994 IS 310 BP 105 EP 114 PG 10 WC Astronomy & Astrophysics; Geosciences, Multidisciplinary SC Astronomy & Astrophysics; Geology GA BB16K UT WOS:A1994BB16K00007 ER PT S AU GIBSON, EK BUSTIN, R AF GIBSON, EK BUSTIN, R BE Zolensky, ME Wilson, TL Rietmeijer, FJM Flynn, GJ TI VOLATILES IN INTERPLANETARY DUST PARTICLES - A COMPARISON WITH VOLATILE-RICH METEORITES SO ANALYSIS OF INTERPLANETARY DUST SE AIP CONFERENCE PROCEEDINGS LA English DT Proceedings Paper CT NASA/LPI Workshop on the Analysis of Interplanetary Dust CY MAY 15-17, 1993 CL LUNAR & PLANETARY INST, HOUSTON, TX SP NASA, LUNAR & PLANETARY INST HO LUNAR & PLANETARY INST C1 NASA,LYNDON B JOHNSON SPACE CTR,PLANETARY SCI BRANCH,HOUSTON,TX 77058. 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 1-56396-341-8 J9 AIP CONF PROC PY 1994 IS 310 BP 173 EP 184 PG 12 WC Astronomy & Astrophysics; Geosciences, Multidisciplinary SC Astronomy & Astrophysics; Geology GA BB16K UT WOS:A1994BB16K00013 ER PT S AU ZOLENSKY, ME HORZ, F SEE, T BERNHARD, R DARDANO, C BARRETT, RA MACK, K WARREN, J KINARD, WH AF ZOLENSKY, ME HORZ, F SEE, T BERNHARD, R DARDANO, C BARRETT, RA MACK, K WARREN, J KINARD, WH BE Zolensky, ME Wilson, TL Rietmeijer, FJM Flynn, GJ TI METEOROID INVESTIGATION USING THE LONG-DURATION EXPOSURE FACILITY SO ANALYSIS OF INTERPLANETARY DUST SE AIP CONFERENCE PROCEEDINGS LA English DT Proceedings Paper CT NASA/LPI Workshop on the Analysis of Interplanetary Dust CY MAY 15-17, 1993 CL LUNAR & PLANETARY INST, HOUSTON, TX SP NASA, LUNAR & PLANETARY INST HO LUNAR & PLANETARY INST C1 NASA,LYNDON B JOHNSON SPACE CTR,DIV SOLAR SYST EXPLORAT,HOUSTON,TX 77058. NR 0 TC 3 Z9 3 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 1-56396-341-8 J9 AIP CONF PROC PY 1994 IS 310 BP 291 EP 304 PG 14 WC Astronomy & Astrophysics; Geosciences, Multidisciplinary SC Astronomy & Astrophysics; Geology GA BB16K UT WOS:A1994BB16K00023 ER PT S AU HORZ, F CINTALA, M BERNHARD, RP SEE, TH AF HORZ, F CINTALA, M BERNHARD, RP SEE, TH BE Zolensky, ME Wilson, TL Rietmeijer, FJM Flynn, GJ TI PENETRATION EXPERIMENTS IN ALUMINUM AND TEFLON TARGETS OF WIDELY VARIABLE THICKNESS SO ANALYSIS OF INTERPLANETARY DUST SE AIP CONFERENCE PROCEEDINGS LA English DT Proceedings Paper CT NASA/LPI Workshop on the Analysis of Interplanetary Dust CY MAY 15-17, 1993 CL LUNAR & PLANETARY INST, HOUSTON, TX SP NASA, LUNAR & PLANETARY INST HO LUNAR & PLANETARY INST C1 NASA,LYNDON B JOHNSON SPACE CTR,DIV SOLAR SYST EXPLORAT,HOUSTON,TX 77058. NR 0 TC 4 Z9 4 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 1-56396-341-8 J9 AIP CONF PROC PY 1994 IS 310 BP 329 EP 344 PG 16 WC Astronomy & Astrophysics; Geosciences, Multidisciplinary SC Astronomy & Astrophysics; Geology GA BB16K UT WOS:A1994BB16K00026 ER PT J AU HILL, CM STREET, KW PHILIPP, WH TANNER, SP AF HILL, CM STREET, KW PHILIPP, WH TANNER, SP TI DETERMINATION OF COPPER IN TAP WATER USING SOLID-PHASE SPECTROPHOTOMETRY SO ANALYTICAL LETTERS LA English DT Article DE COPPER; DRINKING WATER; SOLID-PHASE SPECTROPHOTOMETRY AB A new application of ion exchange films is presented. The films are used in a simple analytical method of directly determining low concentrations of Cu2+ in aqueous solutions, in particular, drinking water. The basis for this new test method is the color and absorption intensity of the ion when adsorbed onto the film. The film takes on the characteristic color of the adsorbed cation, which is concentrated on the film by many orders of magnitude. The linear relationship between absorbance (corrected for variations in film thickness) and solution concentration makes the determinations possible. These determinations agree well with flame atomic absorption determinations. C1 NASA,LEWIS RES CTR,CLEVELAND,OH 44135. UNIV W FLORIDA,DEPT CHEM,PENSACOLA,FL 32514. RP HILL, CM (reprint author), UNIV AKRON,AKRON,OH 44325, USA. NR 10 TC 8 Z9 8 U1 0 U2 0 PU MARCEL DEKKER INC PI NEW YORK PA 270 MADISON AVE, NEW YORK, NY 10016 SN 0003-2719 J9 ANAL LETT JI Anal. Lett. PY 1994 VL 27 IS 13 BP 2589 EP 2599 PG 11 WC Chemistry, Analytical SC Chemistry GA PG438 UT WOS:A1994PG43800013 ER PT S AU BINDSCHADLER, RA FAHNESTOCK, MA SKVARCA, P SCAMBOS, TA AF BINDSCHADLER, RA FAHNESTOCK, MA SKVARCA, P SCAMBOS, TA BE Morris, EM TI SURFACE-VELOCITY FIELD OF THE NORTHERN LARSEN ICE SHELF, ANTARCTICA SO ANNALS OF GLACIOLOGY, VOL 20, 1994: PROCEEDINGS OF THE FIFTH INTERNATIONAL SYMPOSIUM ON ANTARCTIC GLACIOLOGY (VISAG) SE ANNALS OF GLACIOLOGY LA English DT Proceedings Paper CT 5th International Symposium on Antarctic Glasiology (VISAG) CY SEP 05-11, 1993 CL CAMBRIDGE, ENGLAND SP Int Glaciol Soc C1 NASA,GODDARD SPACE FLIGHT CTR,CODE 971,GREENBELT,MD 20771. NR 0 TC 28 Z9 28 U1 1 U2 3 PU INT GLACIOLOGICAL SOC PI CAMBRIDGE PA LENSFIELD RD, CAMBRIDGE, ENGLAND CB2 1ER SN 0260-3055 BN 0-946417-14-8 J9 ANN GLACIOL PY 1994 VL 20 BP 319 EP 326 DI 10.3189/172756494794587294 PG 8 WC Geosciences, Multidisciplinary; Oceanography; Water Resources SC Geology; Oceanography; Water Resources GA BD16B UT WOS:A1994BD16B00050 ER PT S AU BINDSCHADLER, RA VORNBERGER, PL AF BINDSCHADLER, RA VORNBERGER, PL BE Morris, EM TI DETAILED ELEVATION MAP OF ICE STREAM-C, ANTARCTICA, USING SATELLITE IMAGERY AND AIRBORNE RADAR SO ANNALS OF GLACIOLOGY, VOL 20, 1994: PROCEEDINGS OF THE FIFTH INTERNATIONAL SYMPOSIUM ON ANTARCTIC GLACIOLOGY (VISAG) SE ANNALS OF GLACIOLOGY LA English DT Proceedings Paper CT 5th International Symposium on Antarctic Glasiology (VISAG) CY SEP 05-11, 1993 CL CAMBRIDGE, ENGLAND SP Int Glaciol Soc C1 NASA,GODDARD SPACE FLIGHT CTR,CODE 971,GREENBELT,MD 20771. NR 0 TC 19 Z9 19 U1 0 U2 1 PU INT GLACIOLOGICAL SOC PI CAMBRIDGE PA LENSFIELD RD, CAMBRIDGE, ENGLAND CB2 1ER SN 0260-3055 BN 0-946417-14-8 J9 ANN GLACIOL PY 1994 VL 20 BP 327 EP 335 DI 10.3189/172756494794587177 PG 9 WC Geosciences, Multidisciplinary; Oceanography; Water Resources SC Geology; Oceanography; Water Resources GA BD16B UT WOS:A1994BD16B00051 ER PT J AU KROGH, FT AF KROGH, FT BE Brezinski, C Baker, CTH Burrage, K Houwen, PJV Jackiewicz, Z Sharp, PW TI ISSUES IN THE DESIGN OF A MULTISTEP CODE SO ANNALS OF NUMERICAL MATHEMATICS, VOL I, NOS 1-4 (1994): SCIENTIFIC COMPUTATION AND DIFFERENTIAL EQUATIONS - PROCEEDINGS OF THE INTERNATIONAL CONFERENCE ON SCIENTIFIC COMPUTATION AND DIFFERENTIAL EQUATIONS LA English DT Proceedings Paper CT International Conference on Scientific Computation and Differential Equations CY JAN 04-08, 1993 CL UNIV AUCKLAND, DEPT MATH & STAT, AUCKLAND, NEW ZEALAND SP NEW ZEALAND MATH SOC, ROYAL SOC NEW ZEALAND, UNIV AUCKLAND FDN, AUSTR MATH SOC, USN, OFF NAVAL RES HO UNIV AUCKLAND, DEPT MATH & STAT DE NUMERICAL SOLUTION OF ORDINARY DIFFERENTIAL EQUATIONS C1 JET PROP LAB,PASADENA,CA 91109. NR 0 TC 0 Z9 0 U1 0 U2 0 PU J C BALTZER AG PI BASEL PA WETTSTEINPLATZ 10, CH-4058 BASEL, SWITZERLAND PY 1994 BP 423 EP 437 PG 15 WC Mathematics, Applied SC Mathematics GA BB21B UT WOS:A1994BB21B00031 ER PT J AU SPINA, EF SMITS, AJ ROBINSON, SK AF SPINA, EF SMITS, AJ ROBINSON, SK TI THE PHYSICS OF SUPERSONIC TURBULENT BOUNDARY-LAYERS SO ANNUAL REVIEW OF FLUID MECHANICS LA English DT Review DE COMPRESSIBLE FLOW; SHEAR LAYERS; DISTORTED FLOW; HYPERSONICS; FLOW STRUCTURE ID ADVERSE PRESSURE-GRADIENT; SURFACE CURVATURE; SHORT REGIONS; FLOW; DILATATION; WIRE C1 PRINCETON UNIV,DEPT MECH & AEROSP ENGN,PRINCETON,NJ 08544. NASA,LANGLEY RES CTR,EXPTL FLOW PHYS BRANCH,HAMPTON,VA 23665. RP SPINA, EF (reprint author), SYRACUSE UNIV,DEPT AEROSP & MFG ENGN,SYRACUSE,NY 13244, USA. RI Smits, Alexander/B-4083-2016 OI Smits, Alexander/0000-0002-3883-8648 NR 104 TC 97 Z9 98 U1 0 U2 8 PU ANNUAL REVIEWS INC PI PALO ALTO PA 4139 EL CAMINO WAY, PO BOX 10139, PALO ALTO, CA 94303-0139 SN 0066-4189 J9 ANNU REV FLUID MECH JI Annu. Rev. Fluid Mech. PY 1994 VL 26 BP 287 EP 319 DI 10.1146/annurev.fluid.26.1.287 PG 33 WC Mechanics; Physics, Fluids & Plasmas SC Mechanics; Physics GA MT017 UT WOS:A1994MT01700011 ER PT B AU ZWALLY, HJ AF ZWALLY, HJ BE Hempel, G TI DETECTION OF CHANGE IN ANTARCTICA SO ANTARCTIC SCIENCE: GLOBAL CONCERNS LA English DT Proceedings Paper CT Antarctic Science Conference CY SEP, 1991 CL BREMEN, GERMANY SP SCI COMM ANTARCT RES C1 NASA,GODDARD SPACE FLIGHT CTR,OCEANS & ICE BRANCH,GREENBELT,MD 20771. NR 0 TC 6 Z9 6 U1 2 U2 2 PU SPRINGER-VERLAG BERLIN PI BERLIN 33 PA HEIDELBERGER PLATZ 3, W-1000 BERLIN 33, GERMANY BN 3-540-57559-6 PY 1994 BP 126 EP 143 PG 18 WC Ecology; Environmental Sciences; Geology; Meteorology & Atmospheric Sciences; Paleontology SC Environmental Sciences & Ecology; Geology; Meteorology & Atmospheric Sciences; Paleontology GA BB13K UT WOS:A1994BB13K00010 ER PT J AU SAID, MA AF SAID, MA GP SOC PLAST ENGINEERS TI A NOVEL TECHNIQUE FOR MEASURING STRAINS IN THIN-FILMS UNDER BIAXIAL CONDITIONS SO ANTEC 94 - PLASTICS: GATE WAY TO THE FUTURE, VOLS 1-3 LA English DT Proceedings Paper CT 52nd Annual Technical Conference of the Society-of-Plastics-Engineers on Plastics: Gateway to the Future CY MAY 01-05, 1994 CL SAN FRANCISCO, CA SP SOC PLAST ENGINEERS C1 NASA,WALLOPS FLIGHT FACIL,WALLOPS ISL,VA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU SOC PLASTICS ENGINEERS PI BROOKFIELD CENTER PA 14 FAIRFIELD DR, BROOKFIELD CENTER, CT 06805 PY 1994 BP 2272 EP 2275 PG 4 WC Materials Science, Multidisciplinary; Polymer Science SC Materials Science; Polymer Science GA BA73Y UT WOS:A1994BA73Y00440 ER PT B AU HAMKPSHIRE, JB KUMAR, BVKV AF HAMKPSHIRE, JB KUMAR, BVKV BE Rogers, SK Ruck, DW TI EFFICIENT AUTONOMOUS LEARNING FOR STATISTICAL PATTERN-RECOGNITION SO APPLICATIONS OF ARTIFICIAL NEURAL NETWORKS V SE PROCEEDINGS OF THE SOCIETY OF PHOTO-OPTICAL INSTRUMENTATION ENGINEERS (SPIE) LA English DT Proceedings Paper CT 5th International Conference on Applications of Artificial Neural Networks CY APR 05-08, 1994 CL ORLANDO, FL SP SOC PHOTO OPT INSTRUMENTAT ENGINEERS 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 0-8194-1547-2 J9 P SOC PHOTO-OPT INS PY 1994 VL 2243 BP 90 EP 110 PG 21 WC Engineering, Electrical & Electronic; Optics SC Engineering; Optics GA BA44Z UT WOS:A1994BA44Z00011 ER PT B AU SOBIESZCZANSKISOBIESKI, J AF SOBIESZCZANSKISOBIESKI, J BE Miele, A Salvetti, A TI RECENT MATHEMATICAL METHODS FOR ENGINEERING SYSTEM DESIGN .1. OVERCOMING BELLMAN CURSE OF DIMENSIONALITY IN LARGE OPTIMIZATION PROBLEMS SO APPLIED MATHEMATICS IN AEROSPACE SCIENCE AND ENGINEERING SE MATHEMATICAL CONCEPTS AND METHODS IN SCIENCE AND ENGINEERING LA English DT Proceedings Paper CT Meeting on Applied Mathematics in the Aerospace Field CY SEP 03-10, 1991 CL ERICE, ITALY DE OPTIMIZATION; DECOMPOSITION; SYNTHESIS; SYSTEMS; HIERARCHICAL SYSTEMS; SENSITIVITY C1 NASA,LANGLEY RES CTR,DIV STRUCT DYNAM,HAMPTON,VA 23665. NR 0 TC 0 Z9 0 U1 0 U2 1 PU PLENUM PRESS DIV PLENUM PUBLISHING CORP PI NEW YORK PA 233 SPRING ST, NEW YORK, NY 10013 BN 0-306-44754-1 J9 MATH C SCI PY 1994 VL 44 BP 437 EP 443 PG 7 WC Engineering, Aerospace; Engineering, Mechanical; Mathematics, Applied SC Engineering; Mathematics GA BB75D UT WOS:A1994BB75D00017 ER PT B AU SOBIESZCZANSKISOBIESKI, J AF SOBIESZCZANSKISOBIESKI, J BE Miele, A Salvetti, A TI RECENT MATHEMATICAL METHODS FOR ENGINEERING SYSTEM DESIGN .2. SYSTEM APPROACH IN ENGINEERING OPTIMIZATION SO APPLIED MATHEMATICS IN AEROSPACE SCIENCE AND ENGINEERING SE MATHEMATICAL CONCEPTS AND METHODS IN SCIENCE AND ENGINEERING LA English DT Proceedings Paper CT Meeting on Applied Mathematics in the Aerospace Field CY SEP 03-10, 1991 CL ERICE, ITALY DE OPTIMIZATION; DECOMPOSITION; SYNTHESIS; SYSTEMS; HIERARCHICAL SYSTEMS; NONHIERARCHIC SYSTEMS; SENSITIVITY C1 NASA,LANGLEY RES CTR,DIV STRUCT DYNAM,HAMPTON,VA 23665. NR 0 TC 0 Z9 0 U1 0 U2 0 PU PLENUM PRESS DIV PLENUM PUBLISHING CORP PI NEW YORK PA 233 SPRING ST, NEW YORK, NY 10013 BN 0-306-44754-1 J9 MATH C SCI PY 1994 VL 44 BP 445 EP 470 PG 26 WC Engineering, Aerospace; Engineering, Mechanical; Mathematics, Applied SC Engineering; Mathematics GA BB75D UT WOS:A1994BB75D00018 ER PT J AU PAGE, LA CHENG, ES GOLUBOVIC, B GUNDERSEN, J MEYER, SS AF PAGE, LA CHENG, ES GOLUBOVIC, B GUNDERSEN, J MEYER, SS TI MILLIMETER-SUBMILLIMETER WAVELENGTH FILTER SYSTEM SO APPLIED OPTICS LA English DT Article ID MICROWAVE BACKGROUND ANISOTROPY; BANDPASS-FILTERS; RESONANT GRIDS; RADIATION AB We describe the design, fabrication, measurement, and performance of a set of cryogenic millimeter-submillimeter wavelength filters used in a balloonborne bolometric radiometer. The set contains single resonant mesh grids used as dichroic beam splitters, resonant meshes in a double quarter-wave configuration, a commercial inductive grid filter, and high-frequency blocking filters. The resultant system has passbands at lambda = 1.73, 1.05, 0.61, 0.44 mm with delta lambda/lambda = 0.23, 0.23, 0.12, 0.06. Limits on high-frequency leakage are deduced from laboratory measurements and from the analysis of flight data. The filter set response to three different sources of radiation is presented to show the method and limitations of our characterization. The key element of the filter system is a resonant periodic array of cross-shaped holes etched in thin aluminum. We give an empirical scaling law for the resonant wavelength as a function of structure parameters for aluminum on 25-mu m-thick Mylar. Plots of the transmittance for normally incident radiation and the transmittance and reflectance for a 45 degrees incident radiation are presented. C1 NASA, GODDARD SPACE FLIGHT CTR, GREENBELT, MD 20771 USA. MIT, DEPT PHYS, CAMBRIDGE, MA 02139 USA. UNIV SANTA BARBARA, DEPT PHYS, SANTA BARBARA, CA 93106 USA. RP PAGE, LA (reprint author), PRINCETON UNIV, DEPT PHYS, JADWIN HALL, POB 708, PRINCETON, NJ 08544 USA. OI Page, Lyman/0000-0002-9828-3525 NR 30 TC 10 Z9 10 U1 1 U2 1 PU OPTICAL SOC AMER PI WASHINGTON PA 2010 MASSACHUSETTS AVE NW, WASHINGTON, DC 20036 USA SN 0003-6935 J9 APPL OPTICS JI Appl. Optics PD JAN 1 PY 1994 VL 33 IS 1 BP 11 EP 23 PG 13 WC Optics SC Optics GA MT014 UT WOS:A1994MT01400001 PM 20861979 ER PT B AU OLLA, BL DAVIS, MW RYER, CH AF OLLA, BL DAVIS, MW RYER, CH BE DeGroot, SJ Roberts, RJ Danielssen, DS Howell, BR Moksness, E TI BEHAVIORAL DEFICITS IN HATCHERY-REARED FISH - POTENTIAL EFFECTS ON SURVIVAL FOLLOWING RELEASE SO AQUACULTURE AND FISHERIES MANAGEMENT, VOL 25, 1994, SUPPLEMENT 1: SEA RANCHING OF COD AND OTHER MARINE FISH SPECIES, AN INTERNATIONAL SYMPOSIUM LA English DT Proceedings Paper CT International Symposium on Sea Ranching of Cod and Other Marine Fish Species CY JUN 15-18, 1993 CL INST MARINE RES, FLODEVIGEN MARINE RES STN, ARENDAL, NORWAY SP MINIST FISHERIES NORWAY, NORWEGIAN FISHERIES RES COUNCIL, NORWEGIAN SEA RANCHING PROGRAM, AUST AGDER CTY NORWAY HO INST MARINE RES, FLODEVIGEN MARINE RES STN C1 COOPERAT INST MARINE RESOURCE STUDIES,ALASKA FISHERIES SCI CTR,NATL MARINE FISHERIES SERV,NEWPORT,OR. NR 0 TC 0 Z9 0 U1 1 U2 9 PU BLACKWELL SCIENTIFIC PUBL PI OXFORD PA OSNEY MEAD, OXFORD, ENGLAND OX2 OEL PY 1994 BP 19 EP 34 PG 16 WC Fisheries; Marine & Freshwater Biology SC Fisheries; Marine & Freshwater Biology GA BB19H UT WOS:A1994BB19H00002 ER PT J AU RUSSELL, DJ BALAZS, GH AF RUSSELL, DJ BALAZS, GH TI COLONIZATION BY THE ALIEN MARINE ALGA HYPNEA-MUSCIFORMIS (WULFEN) J AG (RHODOPHYTA, GIGARTINALES) IN THE HAWAIIAN-ISLANDS AND ITS UTILIZATION BY THE GREEN TURTLE, CHELONIA-MYDAS L SO AQUATIC BOTANY LA English DT Article ID RED SEAWEED; GROWTH; STRIATUM; FIELD AB In Hawaii, the alien red alga, Hypnea musciformis (Wulfen) J. Ag., was originally planted on reefs in Kaneohe Bay, Oahu, in January 1974, but has since spread to many other locations on Oahu and to other Hawaiian islands. This alga, along with the previously introduced alien seaweed, Acanthophora spicifera (Vahl) Boerg., is now being prominently used as a food source by the green turtle (Chelonia mydas L.) in the Hawaiian Islands. This is the first known documentation of introduced algae being incorporated into the diet of the green turtle, a species considered endangered world-wide. C1 NOAA,NATL MARINE FISHERIES SERV,SW FISHERIES SCI CTR,HONOLULU LAB,HONOLULU,HI 96822. RP RUSSELL, DJ (reprint author), EVERETT COMMUNITY COLL,DEPT BIOL,EVERETT,WA 98201, USA. NR 25 TC 27 Z9 28 U1 0 U2 13 PU ELSEVIER SCIENCE BV PI AMSTERDAM PA PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS SN 0304-3770 J9 AQUAT BOT JI Aquat. Bot. PD JAN PY 1994 VL 47 IS 1 BP 53 EP 60 DI 10.1016/0304-3770(94)90048-5 PG 8 WC Plant Sciences; Marine & Freshwater Biology SC Plant Sciences; Marine & Freshwater Biology GA MY221 UT WOS:A1994MY22100006 ER PT J AU KARR, LJ DONNELLY, DL KOZLOWSKI, A HARRIS, JM AF KARR, LJ DONNELLY, DL KOZLOWSKI, A HARRIS, JM TI USE OF POLY(ETHYLENE GLYCOL)-MODIFIED ANTIBODY IN CELL EXTRACTION SO AQUEOUS TWO-PHASE SYSTEMS SE METHODS IN ENZYMOLOGY LA English DT Review ID POLYMER 2-PHASE SYSTEMS; POLYETHYLENE-GLYCOL; SEPARATION; LIGAND C1 UNIV ALABAMA,DEPT CHEM,HUNTSVILLE,AL 35899. RP KARR, LJ (reprint author), NASA,GEORGE C MARSHALL SPACE FLIGHT CTR,SPACE SCI LAB,HUNTSVILLE,AL 35812, USA. NR 20 TC 26 Z9 26 U1 1 U2 2 PU ACADEMIC PRESS INC PI SAN DIEGO PA 525 B STREET, SUITE 1900, SAN DIEGO, CA 92101-4495 SN 0076-6879 J9 METHOD ENZYMOL JI Methods Enzymol. PY 1994 VL 228 BP 377 EP 390 PG 14 WC Biochemical Research Methods; Biochemistry & Molecular Biology SC Biochemistry & Molecular Biology GA BA88L UT WOS:A1994BA88L00035 PM 8047012 ER PT J AU MIZUGUCHI, K DAMM, GA BOZEMAN, RJ AKKERMAN, JW ABER, GS SVEJKOVSKY, PA BACAK, JW ORIME, Y TAKATANI, S NOSE, Y NOON, GP DEBAKEY, ME AF MIZUGUCHI, K DAMM, GA BOZEMAN, RJ AKKERMAN, JW ABER, GS SVEJKOVSKY, PA BACAK, JW ORIME, Y TAKATANI, S NOSE, Y NOON, GP DEBAKEY, ME TI DEVELOPMENT OF THE BAYLOR NASA AXIAL-FLOW VENTRICULAR ASSIST DEVICE - IN-VITRO PERFORMANCE AND SYSTEMATIC HEMOLYSIS TEST-RESULTS SO ARTIFICIAL ORGANS LA English DT Article; Proceedings Paper CT 9th Congress of the International-Society-for-Artificial-Organs CY JUL, 1993 CL AMSTERDAM, NETHERLANDS SP INT SOC ARTIFICIAL ORGANS DE AXIAL FLOW PUMP; VENTRICULAR ASSIST DEVICE; HEMOLYSIS TEST; INDEX OF HEMOLYSIS; TEST MATRIX; DIRECT CURRENT BRUSHLESS MOTOR ID BLOOD PUMP AB Our newly developed axial flow pump consists of a flow tube, an internal rotating impeller, and a fixed flow stator (we call the stator) behind the impeller. This pump produces a flow of 3 to 8 L/min against 50 to 150 mm Hg pressure difference, respectively, in the range of 10,000 to 16,000 rpm. An axial flow pump that will be used as a ventricular assist device (VAD) has to have low hemolytic and good antithrombogenic characteristics. This paper will show how to decrease the hemolytic properties of this axial flow pump systematically using a test matrix. The test variables evaluated were impeller blade tip geometry, impeller flow tube clearance (radial clearance), impeller stator clearance (axial clearance), impeller blade number, stator blade number, and impeller length. All in vitro hemolysis tests were performed at 5.0 L/min against 100 mm Hg pressure difference using a total of 83 bags of fresh bovine blood. The results were as follows: the impeller blade tip geometry did not significantly effect hemolysis, a 0.005-inch and a 0.009-inch radial clearance were significantly (p < 0.01 or 0.001) less hemolytic than the other clearances, a 0.075-inch axial clearance was significantly (p < 0.05) more hemolytic than the other clearances, two- and six-bladed impellers were significantly (p < 0.01 and 0.02, respectively) less hemolytic than a four-bladed impeller, a five-bladed stator was significantly (p < 0.05 or 0.01) less hemolytic than the other stators, and the impeller length did not make a significant difference. Currently, the best index of hemolysis is 0.031 +/- 0.018 g/100 L, and using parameters from these results, implantable devices are being fabricated. C1 NASA,LYNDON B JOHNSON SPACE CTR,HOUSTON,TX 77058. RP MIZUGUCHI, K (reprint author), BAYLOR COLL MED,DEPT SURG,1 BAYLOR PLAZA,HOUSTON,TX 77030, USA. NR 19 TC 19 Z9 23 U1 0 U2 1 PU BLACKWELL SCIENCE INC PI CAMBRIDGE PA 238 MAIN ST, CAMBRIDGE, MA 02142 SN 0160-564X J9 ARTIF ORGANS JI Artif. Organs PD JAN PY 1994 VL 18 IS 1 BP 32 EP 43 DI 10.1111/j.1525-1594.1994.tb03296.x PG 12 WC Engineering, Biomedical; Transplantation SC Engineering; Transplantation GA MT455 UT WOS:A1994MT45500007 PM 8141655 ER PT J AU DAMM, G MIZUGUCHI, K ABER, G BACAK, J AKKERMAN, J BOZEMAN, R SVEJKOVSKY, P TAKATANI, S NOSE, Y NOON, GP DEBAKEY, ME AF DAMM, G MIZUGUCHI, K ABER, G BACAK, J AKKERMAN, J BOZEMAN, R SVEJKOVSKY, P TAKATANI, S NOSE, Y NOON, GP DEBAKEY, ME TI AXIAL-FLOW VENTRICULAR ASSIST DEVICE - SYSTEM PERFORMANCE CONSIDERATIONS SO ARTIFICIAL ORGANS LA English DT Article; Proceedings Paper CT 9th Congress of the International-Society-for-Artificial-Organs CY JUL, 1993 CL AMSTERDAM, NETHERLANDS SP INT SOC ARTIFICIAL ORGANS DE AXIAL FLOW PUMP; LEFT VENTRICULAR ASSIST DEVICE; SYSTEM EFFICIENCY; HEMOLYSIS AB A cooperative effort between Baylor College of Medicine and NASA/Johnson Space Center is under way to develop an implantable left ventricular assist device for either pulmonary or systemic circulatory support for more than 3 months' duration. Using methodical evaluation and testing, an implantable axial pump has been systematically improved. These improvements include the addition of an inducer as a pumping element in front of the impeller and the construction of an efficient brushless direct current motor. To date, less than 10 W of power is required-to generate 5 L/min flow against 100 mm Hg. An index of hemolysis of 0.021 g/100 L has been achieved. Two-day in vivo feasibility studies in calves are under way to evaluate the antithrombogenic nature of the pump. Further improvements in system efficiency, hemolytic performance, and the antithrombogenic nature of the pump are expected with the use of empirical studies, computer flow modeling, and in vivo testing in calves. C1 NASA,LYNDON B JOHNSON SPACE CTR,HOUSTON,TX 77058. RP DAMM, G (reprint author), BAYLOR COLL MED,DEPT SURG,1 BAYLOR PLAZA,HOUSTON,TX 77030, USA. NR 5 TC 5 Z9 5 U1 0 U2 0 PU BLACKWELL SCIENCE INC PI CAMBRIDGE PA 238 MAIN ST, CAMBRIDGE, MA 02142 SN 0160-564X J9 ARTIF ORGANS JI Artif. Organs PD JAN PY 1994 VL 18 IS 1 BP 44 EP 48 DI 10.1111/j.1525-1594.1994.tb03297.x PG 5 WC Engineering, Biomedical; Transplantation SC Engineering; Transplantation GA MT455 UT WOS:A1994MT45500008 PM 8141657 ER PT S AU YEOMANS, DK AF YEOMANS, DK BE Milani, A DiMartino, M Cellino, A TI A REVIEW OF COMETS AND NONGRAVITATIONAL FORCES SO ASTEROIDS, COMETS, METEORS 1993 SE IAU SYMPOSIA LA English DT Article; Proceedings Paper CT 160th Symposium of the International-Astronomical-Union: Asteroids, Comets, Meteors 1993 CY JUN 14-18, 1993 CL BELGIRATE, ITALY SP INT ASTRON UNION ID SHORT-PERIOD COMETS; MODEL-CALCULATIONS; HALLEY; MOTION; DENSITY AB A review is given on the recent advances in understanding the nature of the nongravitational forces that affect the motions of nearly all active comets. RP YEOMANS, DK (reprint author), CALTECH,JET PROP LAB,4800 OAK GROVE DR,PASADENA,CA 91109, USA. NR 38 TC 0 Z9 0 U1 1 U2 1 PU KLUWER ACADEMIC PUBL PI DORDRECHT PA PO BOX 17, 3300 AA DORDRECHT, NETHERLANDS SN 0074-1809 BN 0-7923-2880-9 J9 IAU SYMP PY 1994 IS 160 BP 241 EP 254 PG 14 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA BB21M UT WOS:A1994BB21M00017 ER PT S AU ENRIGHT, PJ AF ENRIGHT, PJ BE Misra, AK Modi, VJ Holdaway, R Bainum, PM TI ATTITUDE-CONTROL OF THE CASSINI SPACECRAFT DURING PROPULSION SO ASTRODYNAMICS 1993, PTS 1-3 SE ADVANCES IN THE ASTRONAUTICAL SCIENCES LA English DT Meeting Abstract CT AAS/AIAA Astrodynamics Conference CY AUG 16-19, 1993 CL VICTORIA, CANADA SP AMER ASTRONAUT SOC, AMER INST AERONAUT & ASTRONAUT C1 JET PROP LAB,TECH STAFF,PASADENA,CA 91109. NR 0 TC 0 Z9 0 U1 0 U2 0 PU UNIVELT INC PI SAN DIEGO PA PO BOX 28130, SAN DIEGO, CA 92128 SN 0065-3438 BN 0-87703-380-3 J9 ADV ASTRONAUT SCI PY 1994 VL 85 BP 79 EP 79 PN 1-3 PG 1 WC Engineering, Aerospace SC Engineering GA BA73X UT WOS:A1994BA73X00005 ER PT S AU FRAUENHOLZ, RB HAMILTON, TW SHAPIRO, BE BHAT, RS AF FRAUENHOLZ, RB HAMILTON, TW SHAPIRO, BE BHAT, RS BE Misra, AK Modi, VJ Holdaway, R Bainum, PM TI THE ROLE OF ANOMALOUS SATELLITE-FIXED ACCELERATIONS IN TOPEX POSEIDON ORBIT MAINTENANCE SO ASTRODYNAMICS 1993, PTS 1-3 SE ADVANCES IN THE ASTRONAUTICAL SCIENCES LA English DT Proceedings Paper CT AAS/AIAA Astrodynamics Conference CY AUG 16-19, 1993 CL VICTORIA, CANADA SP AMER ASTRONAUT SOC, AMER INST AERONAUT & ASTRONAUT C1 JET PROP LAB,NAVIGAT SYST SECT,PASADENA,CA 91109. NR 0 TC 1 Z9 1 U1 0 U2 0 PU UNIVELT INC PI SAN DIEGO PA PO BOX 28130, SAN DIEGO, CA 92128 SN 0065-3438 BN 0-87703-380-3 J9 ADV ASTRONAUT SCI PY 1994 VL 85 BP 83 EP 102 PN 1-3 PG 20 WC Engineering, Aerospace SC Engineering GA BA73X UT WOS:A1994BA73X00006 ER PT S AU BHAT, RS SHAPIRO, BE FRAUENHOLZ, RB AF BHAT, RS SHAPIRO, BE FRAUENHOLZ, RB BE Misra, AK Modi, VJ Holdaway, R Bainum, PM TI TOPEX POSEIDON ORBIT ACQUISITION MANEUVER SEQUENCE SO ASTRODYNAMICS 1993, PTS 1-3 SE ADVANCES IN THE ASTRONAUTICAL SCIENCES LA English DT Proceedings Paper CT AAS/AIAA Astrodynamics Conference CY AUG 16-19, 1993 CL VICTORIA, CANADA SP AMER ASTRONAUT SOC, AMER INST AERONAUT & ASTRONAUT C1 JET PROP LAB,NAVIGAT SYST SECT,TECH STAFF,PASADENA,CA 91109. NR 0 TC 2 Z9 2 U1 0 U2 0 PU UNIVELT INC PI SAN DIEGO PA PO BOX 28130, SAN DIEGO, CA 92128 SN 0065-3438 BN 0-87703-380-3 J9 ADV ASTRONAUT SCI PY 1994 VL 85 BP 103 EP 121 PN 1-3 PG 19 WC Engineering, Aerospace SC Engineering GA BA73X UT WOS:A1994BA73X00007 ER PT S AU DOLL, CE MISTRETTA, GD HART, RC OZA, DH COX, CM NEMESURE, M BOLVIN, DT AF DOLL, CE MISTRETTA, GD HART, RC OZA, DH COX, CM NEMESURE, M BOLVIN, DT BE Misra, AK Modi, VJ Holdaway, R Bainum, PM TI ACCURACY ASSESSMENT OF TDRSS-BASED TOPEX POSEIDON ORBIT DETERMINATION SOLUTIONS SO ASTRODYNAMICS 1993, PTS 1-3 SE ADVANCES IN THE ASTRONAUTICAL SCIENCES LA English DT Proceedings Paper CT AAS/AIAA Astrodynamics Conference CY AUG 16-19, 1993 CL VICTORIA, CANADA SP AMER ASTRONAUT SOC, AMER INST AERONAUT & ASTRONAUT C1 NASA,GODDARD SPACE FLIGHT CTR,GREENBELT,MD 20771. NR 0 TC 1 Z9 1 U1 0 U2 0 PU UNIVELT INC PI SAN DIEGO PA PO BOX 28130, SAN DIEGO, CA 92128 SN 0065-3438 BN 0-87703-380-3 J9 ADV ASTRONAUT SCI PY 1994 VL 85 BP 123 EP 141 PN 1-3 PG 19 WC Engineering, Aerospace SC Engineering GA BA73X UT WOS:A1994BA73X00008 ER PT S AU QUINN, JR WOLFF, PJ AF QUINN, JR WOLFF, PJ BE Misra, AK Modi, VJ Holdaway, R Bainum, PM TI TOPEX POSEIDON OPERATIONAL ORBIT DETERMINATION RESULTS USING GLOBAL POSITIONING SATELLITES SO ASTRODYNAMICS 1993, PTS 1-3 SE ADVANCES IN THE ASTRONAUTICAL SCIENCES LA English DT Proceedings Paper CT AAS/AIAA Astrodynamics Conference CY AUG 16-19, 1993 CL VICTORIA, CANADA SP AMER ASTRONAUT SOC, AMER INST AERONAUT & ASTRONAUT C1 JET PROP LAB,TECH STAFF,PASADENA,CA 91109. NR 0 TC 0 Z9 0 U1 0 U2 0 PU UNIVELT INC PI SAN DIEGO PA PO BOX 28130, SAN DIEGO, CA 92128 SN 0065-3438 BN 0-87703-380-3 J9 ADV ASTRONAUT SCI PY 1994 VL 85 BP 143 EP 158 PN 1-3 PG 16 WC Engineering, Aerospace SC Engineering GA BA73X UT WOS:A1994BA73X00009 ER PT S AU WU, SC MUELLERSCHOEN, RJ BERTIGER, WI YUNCK, TP BARSEVER, YE MUNSON, TN AF WU, SC MUELLERSCHOEN, RJ BERTIGER, WI YUNCK, TP BARSEVER, YE MUNSON, TN BE Misra, AK Modi, VJ Holdaway, R Bainum, PM TI AUTOMATED PRECISION ORBIT DETERMINATION FOR TOPEX POSEIDON WITH GPS SO ASTRODYNAMICS 1993, PTS 1-3 SE ADVANCES IN THE ASTRONAUTICAL SCIENCES LA English DT Proceedings Paper CT AAS/AIAA Astrodynamics Conference CY AUG 16-19, 1993 CL VICTORIA, CANADA SP AMER ASTRONAUT SOC, AMER INST AERONAUT & ASTRONAUT C1 JET PROP LAB,TRACKING SYST & APPLICAT SECT,TECH GRP,PASADENA,CA 91109. NR 0 TC 1 Z9 1 U1 0 U2 0 PU UNIVELT INC PI SAN DIEGO PA PO BOX 28130, SAN DIEGO, CA 92128 SN 0065-3438 BN 0-87703-380-3 J9 ADV ASTRONAUT SCI PY 1994 VL 85 BP 183 EP 194 PN 1-3 PG 12 WC Engineering, Aerospace SC Engineering GA BA73X UT WOS:A1994BA73X00012 ER PT S AU PUTNEY, BH MARSHALL, JA NEREM, RS LERCH, FJ CHINN, DS JOHNSON, CC KLOSKO, SM LUTHCKE, SB RACHLIN, KE WILLIAMS, TA WILLIAMSON, RG ZELENSKY, NP AF PUTNEY, BH MARSHALL, JA NEREM, RS LERCH, FJ CHINN, DS JOHNSON, CC KLOSKO, SM LUTHCKE, SB RACHLIN, KE WILLIAMS, TA WILLIAMSON, RG ZELENSKY, NP BE Misra, AK Modi, VJ Holdaway, R Bainum, PM TI PRECISE ORBIT DETERMINATION FOR THE TOPEX POSEIDON MISSION SO ASTRODYNAMICS 1993, PTS 1-3 SE ADVANCES IN THE ASTRONAUTICAL SCIENCES LA English DT Proceedings Paper CT AAS/AIAA Astrodynamics Conference CY AUG 16-19, 1993 CL VICTORIA, CANADA SP AMER ASTRONAUT SOC, AMER INST AERONAUT & ASTRONAUT C1 NASA,GODDARD SPACE FLIGHT CTR,SPACE GEODESY BRANCH,GREENBELT,MD 20771. RI Luthcke, Scott/D-6283-2012 NR 0 TC 0 Z9 0 U1 0 U2 0 PU UNIVELT INC PI SAN DIEGO PA PO BOX 28130, SAN DIEGO, CA 92128 SN 0065-3438 BN 0-87703-380-3 J9 ADV ASTRONAUT SCI PY 1994 VL 85 BP 195 EP 212 PN 1-3 PG 18 WC Engineering, Aerospace SC Engineering GA BA73X UT WOS:A1994BA73X00013 ER PT S AU SPENCER, DA SALAMA, AH AF SPENCER, DA SALAMA, AH BE Misra, AK Modi, VJ Holdaway, R Bainum, PM TI COMPUTATION AND APPLICATION OF THE TOPEX POSEIDON ORBIT EVENT FILE SO ASTRODYNAMICS 1993, PTS 1-3 SE ADVANCES IN THE ASTRONAUTICAL SCIENCES LA English DT Proceedings Paper CT AAS/AIAA Astrodynamics Conference CY AUG 16-19, 1993 CL VICTORIA, CANADA SP AMER ASTRONAUT SOC, AMER INST AERONAUT & ASTRONAUT C1 JET PROP LAB,MISSION DESIGN SECT,TECH STAFF,PASADENA,CA 91109. NR 0 TC 0 Z9 0 U1 0 U2 0 PU UNIVELT INC PI SAN DIEGO PA PO BOX 28130, SAN DIEGO, CA 92128 SN 0065-3438 BN 0-87703-380-3 J9 ADV ASTRONAUT SCI PY 1994 VL 85 BP 213 EP 224 PN 1-3 PG 12 WC Engineering, Aerospace SC Engineering GA BA73X UT WOS:A1994BA73X00014 ER PT S AU NEREM, RS LEMOINE, FG MARSHALL, JA ROWLANDS, DD SMITH, DE PERINI, JP AF NEREM, RS LEMOINE, FG MARSHALL, JA ROWLANDS, DD SMITH, DE PERINI, JP BE Misra, AK Modi, VJ Holdaway, R Bainum, PM TI PRECISION ORBIT DETERMINATION FOR THE MARS OBSERVER MISSION SO ASTRODYNAMICS 1993, PTS 1-3 SE ADVANCES IN THE ASTRONAUTICAL SCIENCES LA English DT Proceedings Paper CT AAS/AIAA Astrodynamics Conference CY AUG 16-19, 1993 CL VICTORIA, CANADA SP AMER ASTRONAUT SOC, AMER INST AERONAUT & ASTRONAUT C1 NASA,GODDARD SPACE FLIGHT CTR,GREENBELT,MD 20771. RI Rowlands, David/D-2751-2012; Lemoine, Frank/D-1215-2013 NR 0 TC 0 Z9 0 U1 0 U2 0 PU UNIVELT INC PI SAN DIEGO PA PO BOX 28130, SAN DIEGO, CA 92128 SN 0065-3438 BN 0-87703-380-3 J9 ADV ASTRONAUT SCI PY 1994 VL 85 BP 255 EP 278 PN 1-3 PG 24 WC Engineering, Aerospace SC Engineering GA BA73X UT WOS:A1994BA73X00017 ER PT S AU CHODAS, PW LEWICKI, SA HENSLEY, S MASTERS, WC AF CHODAS, PW LEWICKI, SA HENSLEY, S MASTERS, WC BE Misra, AK Modi, VJ Holdaway, R Bainum, PM TI HIGH-PRECISION MAGELLAN ORBIT DETERMINATION FOR STEREO IMAGE-PROCESSING SO ASTRODYNAMICS 1993, PTS 1-3 SE ADVANCES IN THE ASTRONAUTICAL SCIENCES LA English DT Proceedings Paper CT AAS/AIAA Astrodynamics Conference CY AUG 16-19, 1993 CL VICTORIA, CANADA SP AMER ASTRONAUT SOC, AMER INST AERONAUT & ASTRONAUT C1 JET PROP LAB,NAVIGAT SYST SECT,TECH STAFF,PASADENA,CA 91109. NR 0 TC 1 Z9 1 U1 0 U2 0 PU UNIVELT INC PI SAN DIEGO PA PO BOX 28130, SAN DIEGO, CA 92128 SN 0065-3438 BN 0-87703-380-3 J9 ADV ASTRONAUT SCI PY 1994 VL 85 BP 279 EP 296 PN 1-3 PG 18 WC Engineering, Aerospace SC Engineering GA BA73X UT WOS:A1994BA73X00018 ER PT S AU MENON, PR EFRON, L MILLER, JK AF MENON, PR EFRON, L MILLER, JK BE Misra, AK Modi, VJ Holdaway, R Bainum, PM TI ORBIT DETERMINATION OF HITEN FOR INSERTION INTO LUNAR ORBIT SO ASTRODYNAMICS 1993, PTS 1-3 SE ADVANCES IN THE ASTRONAUTICAL SCIENCES LA English DT Proceedings Paper CT AAS/AIAA Astrodynamics Conference CY AUG 16-19, 1993 CL VICTORIA, CANADA SP AMER ASTRONAUT SOC, AMER INST AERONAUT & ASTRONAUT C1 JET PROP LAB,NAVIGAT SYST SECT,TECH STAFF,PASADENA,CA 91109. NR 0 TC 0 Z9 0 U1 0 U2 0 PU UNIVELT INC PI SAN DIEGO PA PO BOX 28130, SAN DIEGO, CA 92128 SN 0065-3438 BN 0-87703-380-3 J9 ADV ASTRONAUT SCI PY 1994 VL 85 BP 331 EP 342 PN 1-3 PG 12 WC Engineering, Aerospace SC Engineering GA BA73X UT WOS:A1994BA73X00021 ER PT S AU BHASKARAN, S NICHOLSON, FT KALLEMEYN, PH HAW, RJ ANTREASIAN, PG GARNER, GJ AF BHASKARAN, S NICHOLSON, FT KALLEMEYN, PH HAW, RJ ANTREASIAN, PG GARNER, GJ BE Misra, AK Modi, VJ Holdaway, R Bainum, PM TI GALILEO ORBIT DETERMINATION FOR THE EARTH-2 ENCOUNTER SO ASTRODYNAMICS 1993, PTS 1-3 SE ADVANCES IN THE ASTRONAUTICAL SCIENCES LA English DT Proceedings Paper CT AAS/AIAA Astrodynamics Conference CY AUG 16-19, 1993 CL VICTORIA, CANADA SP AMER ASTRONAUT SOC, AMER INST AERONAUT & ASTRONAUT C1 JET PROP LAB,TECH STAFF,PASADENA,CA 91109. NR 0 TC 1 Z9 1 U1 0 U2 0 PU UNIVELT INC PI SAN DIEGO PA PO BOX 28130, SAN DIEGO, CA 92128 SN 0065-3438 BN 0-87703-380-3 J9 ADV ASTRONAUT SCI PY 1994 VL 85 BP 343 EP 354 PN 1-3 PG 12 WC Engineering, Aerospace SC Engineering GA BA73X UT WOS:A1994BA73X00022 ER PT S AU TAYLOR, AH IONASESCU, R VAUGHAN, RM AF TAYLOR, AH IONASESCU, R VAUGHAN, RM BE Misra, AK Modi, VJ Holdaway, R Bainum, PM TI A 1ST LOOK AT ORBIT DETERMINATION FOR THE CASSINI MISSION SO ASTRODYNAMICS 1993, PTS 1-3 SE ADVANCES IN THE ASTRONAUTICAL SCIENCES LA English DT Proceedings Paper CT AAS/AIAA Astrodynamics Conference CY AUG 16-19, 1993 CL VICTORIA, CANADA SP AMER ASTRONAUT SOC, AMER INST AERONAUT & ASTRONAUT C1 JET PROP LAB,NAVIGAT SYST SECT,TECH STAFF,PASADENA,CA 91109. NR 0 TC 0 Z9 0 U1 0 U2 0 PU UNIVELT INC PI SAN DIEGO PA PO BOX 28130, SAN DIEGO, CA 92128 SN 0065-3438 BN 0-87703-380-3 J9 ADV ASTRONAUT SCI PY 1994 VL 85 BP 355 EP 374 PN 1-3 PG 20 WC Engineering, Aerospace SC Engineering GA BA73X UT WOS:A1994BA73X00023 ER PT S AU SWEETSER, TH AF SWEETSER, TH BE Misra, AK Modi, VJ Holdaway, R Bainum, PM TI JACOBIS INTEGRAL AND DELTA-V-EARTH-GRAVITY-ASSIST (DELTA-V-EGA) TRAJECTORIES SO ASTRODYNAMICS 1993, PTS 1-3 SE ADVANCES IN THE ASTRONAUTICAL SCIENCES LA English DT Proceedings Paper CT AAS/AIAA Astrodynamics Conference CY AUG 16-19, 1993 CL VICTORIA, CANADA SP AMER ASTRONAUT SOC, AMER INST AERONAUT & ASTRONAUT C1 JET PROP LAB,TECH STAFF,PASADENA,CA 91109. NR 0 TC 1 Z9 1 U1 0 U2 0 PU UNIVELT INC PI SAN DIEGO PA PO BOX 28130, SAN DIEGO, CA 92128 SN 0065-3438 BN 0-87703-380-3 J9 ADV ASTRONAUT SCI PY 1994 VL 85 BP 417 EP 429 PN 1-3 PG 13 WC Engineering, Aerospace SC Engineering GA BA73X UT WOS:A1994BA73X00026 ER PT S AU STRIEPE, SA DESAI, PN AF STRIEPE, SA DESAI, PN BE Misra, AK Modi, VJ Holdaway, R Bainum, PM TI PILOTED MARS MISSIONS USING CRYOGENIC AND STORABLE PROPELLANTS SO ASTRODYNAMICS 1993, PTS 1-3 SE ADVANCES IN THE ASTRONAUTICAL SCIENCES LA English DT Proceedings Paper CT AAS/AIAA Astrodynamics Conference CY AUG 16-19, 1993 CL VICTORIA, CANADA SP AMER ASTRONAUT SOC, AMER INST AERONAUT & ASTRONAUT C1 NASA,LANGLEY RES CTR,DIV SPACE SYST,HAMPTON,VA 23665. NR 0 TC 0 Z9 0 U1 0 U2 0 PU UNIVELT INC PI SAN DIEGO PA PO BOX 28130, SAN DIEGO, CA 92128 SN 0065-3438 BN 0-87703-380-3 J9 ADV ASTRONAUT SCI PY 1994 VL 85 BP 431 EP 450 PN 1-3 PG 20 WC Engineering, Aerospace SC Engineering GA BA73X UT WOS:A1994BA73X00027 ER PT S AU SAUER, CG AF SAUER, CG BE Misra, AK Modi, VJ Holdaway, R Bainum, PM TI PLANETARY MISSION PERFORMANCE FOR SMALL SOLAR ELECTRIC PROPULSION SPACECRAFT SO ASTRODYNAMICS 1993, PTS 1-3 SE ADVANCES IN THE ASTRONAUTICAL SCIENCES LA English DT Proceedings Paper CT AAS/AIAA Astrodynamics Conference CY AUG 16-19, 1993 CL VICTORIA, CANADA SP AMER ASTRONAUT SOC, AMER INST AERONAUT & ASTRONAUT C1 JET PROP LAB,ADV PROJECTS GRP,MISSION DESIGN SECT,TECH STAFF,PASADENA,CA 91109. NR 0 TC 0 Z9 0 U1 0 U2 0 PU UNIVELT INC PI SAN DIEGO PA PO BOX 28130, SAN DIEGO, CA 92128 SN 0065-3438 BN 0-87703-380-3 J9 ADV ASTRONAUT SCI PY 1994 VL 85 BP 935 EP 952 PN 1-3 PG 18 WC Engineering, Aerospace SC Engineering GA BA73X UT WOS:A1994BA73X00056 ER PT S AU COOK, RA MCNAMEE, JB AF COOK, RA MCNAMEE, JB BE Misra, AK Modi, VJ Holdaway, R Bainum, PM TI MISSION DESIGN FOR THE MARS ENVIRONMENTAL SURVEY SO ASTRODYNAMICS 1993, PTS 1-3 SE ADVANCES IN THE ASTRONAUTICAL SCIENCES LA English DT Proceedings Paper CT AAS/AIAA Astrodynamics Conference CY AUG 16-19, 1993 CL VICTORIA, CANADA SP AMER ASTRONAUT SOC, AMER INST AERONAUT & ASTRONAUT C1 JET PROP LAB,TERR PLANETS MISSION ANAL GRP,TECH STAFF,PASADENA,CA 91109. NR 0 TC 0 Z9 0 U1 0 U2 0 PU UNIVELT INC PI SAN DIEGO PA PO BOX 28130, SAN DIEGO, CA 92128 SN 0065-3438 BN 0-87703-380-3 J9 ADV ASTRONAUT SCI PY 1994 VL 85 BP 967 EP 981 PN 1-3 PG 15 WC Engineering, Aerospace SC Engineering GA BA73X UT WOS:A1994BA73X00058 ER PT S AU HASTRUP, R CESARONE, R COOK, R KNOCKE, P MCOMBER, R AF HASTRUP, R CESARONE, R COOK, R KNOCKE, P MCOMBER, R BE Misra, AK Modi, VJ Holdaway, R Bainum, PM TI MARS RELAY SATELLITE ORBIT DESIGN CONSIDERATIONS FOR GLOBAL SUPPORT OF ROBOTIC SURFACE MISSIONS SO ASTRODYNAMICS 1993, PTS 1-3 SE ADVANCES IN THE ASTRONAUTICAL SCIENCES LA English DT Proceedings Paper CT AAS/AIAA Astrodynamics Conference CY AUG 16-19, 1993 CL VICTORIA, CANADA SP AMER ASTRONAUT SOC, AMER INST AERONAUT & ASTRONAUT C1 JET PROP LAB,MISSION DESIGN SECT,PASADENA,CA 91109. NR 0 TC 0 Z9 0 U1 0 U2 0 PU UNIVELT INC PI SAN DIEGO PA PO BOX 28130, SAN DIEGO, CA 92128 SN 0065-3438 BN 0-87703-380-3 J9 ADV ASTRONAUT SCI PY 1994 VL 85 BP 983 EP 1001 PN 1-3 PG 19 WC Engineering, Aerospace SC Engineering GA BA73X UT WOS:A1994BA73X00059 ER PT S AU POTTS, CL WILSON, MG AF POTTS, CL WILSON, MG BE Misra, AK Modi, VJ Holdaway, R Bainum, PM TI MANEUVER DESIGN FOR THE GALILEO VEEGA TRAJECTORY SO ASTRODYNAMICS 1993, PTS 1-3 SE ADVANCES IN THE ASTRONAUTICAL SCIENCES LA English DT Proceedings Paper CT AAS/AIAA Astrodynamics Conference CY AUG 16-19, 1993 CL VICTORIA, CANADA SP AMER ASTRONAUT SOC, AMER INST AERONAUT & ASTRONAUT C1 JET PROP LAB,GALILEO NAVIGAT TEAM,NAVIGAT SYST SECT,TECH STAFF,PASADENA,CA 91109. NR 0 TC 1 Z9 1 U1 1 U2 1 PU UNIVELT INC PI SAN DIEGO PA PO BOX 28130, SAN DIEGO, CA 92128 SN 0065-3438 BN 0-87703-380-3 J9 ADV ASTRONAUT SCI PY 1994 VL 85 BP 1019 EP 1047 PN 1-3 PG 29 WC Engineering, Aerospace SC Engineering GA BA73X UT WOS:A1994BA73X00061 ER PT S AU WOLF, AA BYRNES, DV AF WOLF, AA BYRNES, DV BE Misra, AK Modi, VJ Holdaway, R Bainum, PM TI DESIGN OF THE GALILEO SATELLITE TOUR SO ASTRODYNAMICS 1993, PTS 1-3 SE ADVANCES IN THE ASTRONAUTICAL SCIENCES LA English DT Proceedings Paper CT AAS/AIAA Astrodynamics Conference CY AUG 16-19, 1993 CL VICTORIA, CANADA SP AMER ASTRONAUT SOC, AMER INST AERONAUT & ASTRONAUT C1 JET PROP LAB,TECH STAFF,PASADENA,CA 91109. NR 0 TC 0 Z9 0 U1 0 U2 0 PU UNIVELT INC PI SAN DIEGO PA PO BOX 28130, SAN DIEGO, CA 92128 SN 0065-3438 BN 0-87703-380-3 J9 ADV ASTRONAUT SCI PY 1994 VL 85 BP 1049 EP 1063 PN 1-3 PG 15 WC Engineering, Aerospace SC Engineering GA BA73X UT WOS:A1994BA73X00062 ER PT S AU PERALTA, F SMITH, JC AF PERALTA, F SMITH, JC BE Misra, AK Modi, VJ Holdaway, R Bainum, PM TI CASSINI TRAJECTORY DESIGN DESCRIPTION SO ASTRODYNAMICS 1993, PTS 1-3 SE ADVANCES IN THE ASTRONAUTICAL SCIENCES LA English DT Proceedings Paper CT AAS/AIAA Astrodynamics Conference CY AUG 16-19, 1993 CL VICTORIA, CANADA SP AMER ASTRONAUT SOC, AMER INST AERONAUT & ASTRONAUT C1 JET PROP LAB,TECH STAFF,PASADENA,CA 91109. NR 0 TC 0 Z9 0 U1 0 U2 0 PU UNIVELT INC PI SAN DIEGO PA PO BOX 28130, SAN DIEGO, CA 92128 SN 0065-3438 BN 0-87703-380-3 J9 ADV ASTRONAUT SCI PY 1994 VL 85 BP 1065 EP 1084 PN 1-3 PG 20 WC Engineering, Aerospace SC Engineering GA BA73X UT WOS:A1994BA73X00063 ER PT S AU PHILLIPS, ME SELMARTEN, JD AF PHILLIPS, ME SELMARTEN, JD BE Misra, AK Modi, VJ Holdaway, R Bainum, PM TI LAUNCH WINDOW DESIGN AND DEVELOPMENT PROCESS - AN HISTORICAL ACCOUNT FOR THE ATMOSPHERIC LABORATORY FOR APPLICATIONS AND SCIENCE-1 (ATLAS-1) MISSION SO ASTRODYNAMICS 1993, PTS 1-3 SE ADVANCES IN THE ASTRONAUTICAL SCIENCES LA English DT Proceedings Paper CT AAS/AIAA Astrodynamics Conference CY AUG 16-19, 1993 CL VICTORIA, CANADA SP AMER ASTRONAUT SOC, AMER INST AERONAUT & ASTRONAUT C1 NASA,GEORGE C MARSHALL SPACE FLIGHT CTR,HUNTSVILLE,AL 35812. NR 0 TC 0 Z9 0 U1 0 U2 0 PU UNIVELT INC PI SAN DIEGO PA PO BOX 28130, SAN DIEGO, CA 92128 SN 0065-3438 BN 0-87703-380-3 J9 ADV ASTRONAUT SCI PY 1994 VL 85 BP 1087 EP 1104 PN 1-3 PG 18 WC Engineering, Aerospace SC Engineering GA BA73X UT WOS:A1994BA73X00064 ER PT S AU STEWART, WS TYLER, CA HORVATH, TJ PHILLIPS, ME SELMARTEN, JD WEEKS, LK WRIGHT, WC ZIMMERMAN, CJ AF STEWART, WS TYLER, CA HORVATH, TJ PHILLIPS, ME SELMARTEN, JD WEEKS, LK WRIGHT, WC ZIMMERMAN, CJ BE Misra, AK Modi, VJ Holdaway, R Bainum, PM TI ATLAS-1 MISSION DESIGN CONCEPTS APPLIED TO A MULTIDISCIPLINE PAYLOAD SO ASTRODYNAMICS 1993, PTS 1-3 SE ADVANCES IN THE ASTRONAUTICAL SCIENCES LA English DT Proceedings Paper CT AAS/AIAA Astrodynamics Conference CY AUG 16-19, 1993 CL VICTORIA, CANADA SP AMER ASTRONAUT SOC, AMER INST AERONAUT & ASTRONAUT C1 NASA,GEORGE C MARSHALL SPACE FLIGHT CTR,HUNTSVILLE,AL 35812. NR 0 TC 0 Z9 0 U1 0 U2 0 PU UNIVELT INC PI SAN DIEGO PA PO BOX 28130, SAN DIEGO, CA 92128 SN 0065-3438 BN 0-87703-380-3 J9 ADV ASTRONAUT SCI PY 1994 VL 85 BP 1105 EP 1116 PN 1-3 PG 12 WC Engineering, Aerospace SC Engineering GA BA73X UT WOS:A1994BA73X00065 ER PT S AU VINCENT, MA AF VINCENT, MA BE Misra, AK Modi, VJ Holdaway, R Bainum, PM TI DESIGN OF THE TOPSAT MISSION SO ASTRODYNAMICS 1993, PTS 1-3 SE ADVANCES IN THE ASTRONAUTICAL SCIENCES LA English DT Proceedings Paper CT AAS/AIAA Astrodynamics Conference CY AUG 16-19, 1993 CL VICTORIA, CANADA SP AMER ASTRONAUT SOC, AMER INST AERONAUT & ASTRONAUT C1 JET PROP LAB,TECH STAFF,PASADENA,CA 91109. NR 0 TC 0 Z9 0 U1 0 U2 0 PU UNIVELT INC PI SAN DIEGO PA PO BOX 28130, SAN DIEGO, CA 92128 SN 0065-3438 BN 0-87703-380-3 J9 ADV ASTRONAUT SCI PY 1994 VL 85 BP 1137 EP 1146 PN 1-3 PG 10 WC Engineering, Aerospace SC Engineering GA BA73X UT WOS:A1994BA73X00067 ER PT S AU KONOPLIV, AS SJOGREN, WL WIMBERLY, RN COOK, RA VIJAYARAGHAVAN, A AF KONOPLIV, AS SJOGREN, WL WIMBERLY, RN COOK, RA VIJAYARAGHAVAN, A BE Misra, AK Modi, VJ Holdaway, R Bainum, PM TI A HIGH-RESOLUTION LUNAR GRAVITY-FIELD AND PREDICTED ORBIT BEHAVIOR SO ASTRODYNAMICS 1993, PTS 1-3 SE ADVANCES IN THE ASTRONAUTICAL SCIENCES LA English DT Proceedings Paper CT AAS/AIAA Astrodynamics Conference CY AUG 16-19, 1993 CL VICTORIA, CANADA SP AMER ASTRONAUT SOC, AMER INST AERONAUT & ASTRONAUT C1 JET PROP LAB,NAVIGAT SYST SECT,TECH STAFF,PASADENA,CA 91109. NR 0 TC 0 Z9 0 U1 0 U2 0 PU UNIVELT INC PI SAN DIEGO PA PO BOX 28130, SAN DIEGO, CA 92128 SN 0065-3438 BN 0-87703-380-3 J9 ADV ASTRONAUT SCI PY 1994 VL 85 BP 1275 EP 1294 PN 1-3 PG 20 WC Engineering, Aerospace SC Engineering GA BA73X UT WOS:A1994BA73X00075 ER PT S AU VIJAYARAGHAVAN, A KONOPLIV, AS DEMCAK, S BATCHELDER, MP SJOGREN, WL AF VIJAYARAGHAVAN, A KONOPLIV, AS DEMCAK, S BATCHELDER, MP SJOGREN, WL BE Misra, AK Modi, VJ Holdaway, R Bainum, PM TI MARS GRAVITY-FIELD FROM DUAL SATELLITE-OBSERVATIONS SO ASTRODYNAMICS 1993, PTS 1-3 SE ADVANCES IN THE ASTRONAUTICAL SCIENCES LA English DT Proceedings Paper CT AAS/AIAA Astrodynamics Conference CY AUG 16-19, 1993 CL VICTORIA, CANADA SP AMER ASTRONAUT SOC, AMER INST AERONAUT & ASTRONAUT C1 JET PROP LAB,NAVIGAT SYST SECT,TECH STAFF,PASADENA,CA 91109. NR 0 TC 0 Z9 0 U1 0 U2 0 PU UNIVELT INC PI SAN DIEGO PA PO BOX 28130, SAN DIEGO, CA 92128 SN 0065-3438 BN 0-87703-380-3 J9 ADV ASTRONAUT SCI PY 1994 VL 85 BP 1295 EP 1312 PN 1-3 PG 18 WC Engineering, Aerospace SC Engineering GA BA73X UT WOS:A1994BA73X00076 ER PT S AU DIAMOND, PS TOLSON, RH AF DIAMOND, PS TOLSON, RH BE Misra, AK Modi, VJ Holdaway, R Bainum, PM TI A FEASIBILITY STUDY OF A MICROGRAVITY ENHANCEMENT SYSTEM FOR SPACE STATION FREEDOM SO ASTRODYNAMICS 1993, PTS 1-3 SE ADVANCES IN THE ASTRONAUTICAL SCIENCES LA English DT Proceedings Paper CT AAS/AIAA Astrodynamics Conference CY AUG 16-19, 1993 CL VICTORIA, CANADA SP AMER ASTRONAUT SOC, AMER INST AERONAUT & ASTRONAUT C1 GEORGE WASHINGTON UNIV,NASA,LANGLEY RES CTR,JOINT INST ADV FLIGHT SCI,HAMPTON,VA 23681. NR 0 TC 0 Z9 0 U1 0 U2 0 PU UNIVELT INC PI SAN DIEGO PA PO BOX 28130, SAN DIEGO, CA 92128 SN 0065-3438 BN 0-87703-380-3 J9 ADV ASTRONAUT SCI PY 1994 VL 85 BP 1351 EP 1367 PN 1-3 PG 17 WC Engineering, Aerospace SC Engineering GA BA73X UT WOS:A1994BA73X00079 ER PT S AU KWOK, JH AF KWOK, JH BE Misra, AK Modi, VJ Holdaway, R Bainum, PM TI A NEW MISSION CONCEPT FOR THE SPACE INFRARED TELESCOPE FACILITY SO ASTRODYNAMICS 1993, PTS 1-3 SE ADVANCES IN THE ASTRONAUTICAL SCIENCES LA English DT Proceedings Paper CT AAS/AIAA Astrodynamics Conference CY AUG 16-19, 1993 CL VICTORIA, CANADA SP AMER ASTRONAUT SOC, AMER INST AERONAUT & ASTRONAUT C1 JET PROP LAB,MISSION DESIGN SECT,PASADENA,CA 91109. NR 0 TC 0 Z9 0 U1 0 U2 0 PU UNIVELT INC PI SAN DIEGO PA PO BOX 28130, SAN DIEGO, CA 92128 SN 0065-3438 BN 0-87703-380-3 J9 ADV ASTRONAUT SCI PY 1994 VL 85 BP 1401 EP 1417 PN 1-3 PG 17 WC Engineering, Aerospace SC Engineering GA BA73X UT WOS:A1994BA73X00082 ER PT S AU HOFFMAN, D AF HOFFMAN, D BE Misra, AK Modi, VJ Holdaway, R Bainum, PM TI ON THE COST OF STATIONING A SATELLITE IN-ORBIT AROUND THE TRANSLUNAR EQUILIBRIUM-POINT SO ASTRODYNAMICS 1993, PTS 1-3 SE ADVANCES IN THE ASTRONAUTICAL SCIENCES LA English DT Proceedings Paper CT AAS/AIAA Astrodynamics Conference CY AUG 16-19, 1993 CL VICTORIA, CANADA SP AMER ASTRONAUT SOC, AMER INST AERONAUT & ASTRONAUT C1 NASA,LYNDON B JOHNSON SPACE CTR,DIV SYST ENGN,PERFORMANCE ANAL BRANCH,HOUSTON,TX 77058. NR 0 TC 0 Z9 0 U1 0 U2 0 PU UNIVELT INC PI SAN DIEGO PA PO BOX 28130, SAN DIEGO, CA 92128 SN 0065-3438 BN 0-87703-380-3 J9 ADV ASTRONAUT SCI PY 1994 VL 85 BP 1435 EP 1454 PN 1-3 PG 20 WC Engineering, Aerospace SC Engineering GA BA73X UT WOS:A1994BA73X00084 ER PT S AU LYONS, DT SJOGREN, WL LOCK, RE AUSTIN, RS AF LYONS, DT SJOGREN, WL LOCK, RE AUSTIN, RS BE Misra, AK Modi, VJ Holdaway, R Bainum, PM TI BEYOND AEROBRAKING - DESIGNING THE MAGELLAN GLOBAL GRAVITY EXPERIMENT SO ASTRODYNAMICS 1993, PTS 1-3 SE ADVANCES IN THE ASTRONAUTICAL SCIENCES LA English DT Proceedings Paper CT AAS/AIAA Astrodynamics Conference CY AUG 16-19, 1993 CL VICTORIA, CANADA SP AMER ASTRONAUT SOC, AMER INST AERONAUT & ASTRONAUT C1 JET PROP LAB,TECH STAFF,PASADENA,CA 91109. NR 0 TC 1 Z9 1 U1 0 U2 0 PU UNIVELT INC PI SAN DIEGO PA PO BOX 28130, SAN DIEGO, CA 92128 SN 0065-3438 BN 0-87703-380-3 J9 ADV ASTRONAUT SCI PY 1994 VL 85 BP 1471 EP 1484 PN 1-3 PG 14 WC Engineering, Aerospace SC Engineering GA BA73X UT WOS:A1994BA73X00086 ER PT S AU DESAI, PN TARTABINI, PV AF DESAI, PN TARTABINI, PV BE Misra, AK Modi, VJ Holdaway, R Bainum, PM TI EFFECT OF EARTH AND MARS DEPARTURE DELAYS ON HUMAN MISSIONS TO MARS SO ASTRODYNAMICS 1993, PTS 1-3 SE ADVANCES IN THE ASTRONAUTICAL SCIENCES LA English DT Proceedings Paper CT AAS/AIAA Astrodynamics Conference CY AUG 16-19, 1993 CL VICTORIA, CANADA SP AMER ASTRONAUT SOC, AMER INST AERONAUT & ASTRONAUT C1 NASA,LANGLEY RES CTR,DIV SPACE SYST,HAMPTON,VA 23665. NR 0 TC 0 Z9 0 U1 0 U2 0 PU UNIVELT INC PI SAN DIEGO PA PO BOX 28130, SAN DIEGO, CA 92128 SN 0065-3438 BN 0-87703-380-3 J9 ADV ASTRONAUT SCI PY 1994 VL 85 BP 1485 EP 1508 PN 1-3 PG 24 WC Engineering, Aerospace SC Engineering GA BA73X UT WOS:A1994BA73X00087 ER PT S AU KROGER, PM AF KROGER, PM BE Misra, AK Modi, VJ Holdaway, R Bainum, PM TI VELOCITY ESTIMATION OF A WIND-DRIVEN MARTIN BALLOON SO ASTRODYNAMICS 1993, PTS 1-3 SE ADVANCES IN THE ASTRONAUTICAL SCIENCES LA English DT Proceedings Paper CT AAS/AIAA Astrodynamics Conference CY AUG 16-19, 1993 CL VICTORIA, CANADA SP AMER ASTRONAUT SOC, AMER INST AERONAUT & ASTRONAUT C1 JET PROP LAB,TRACKING SYST & APPLICAT SECT,TECH STAFF,PASADENA,CA 91109. NR 0 TC 0 Z9 0 U1 0 U2 0 PU UNIVELT INC PI SAN DIEGO PA PO BOX 28130, SAN DIEGO, CA 92128 SN 0065-3438 BN 0-87703-380-3 J9 ADV ASTRONAUT SCI PY 1994 VL 85 BP 1509 EP 1523 PN 1-3 PG 15 WC Engineering, Aerospace SC Engineering GA BA73X UT WOS:A1994BA73X00088 ER PT S AU FLANAGAN, S PERALTA, F AF FLANAGAN, S PERALTA, F BE Misra, AK Modi, VJ Holdaway, R Bainum, PM TI CASSINI 1997 VVEJGA TRAJECTORY LAUNCH ARRIVAL SPACE ANALYSIS SO ASTRODYNAMICS 1993, PTS 1-3 SE ADVANCES IN THE ASTRONAUTICAL SCIENCES LA English DT Proceedings Paper CT AAS/AIAA Astrodynamics Conference CY AUG 16-19, 1993 CL VICTORIA, CANADA SP AMER ASTRONAUT SOC, AMER INST AERONAUT & ASTRONAUT C1 JET PROP LAB,TECH STAFF,PASADENA,CA 91109. NR 0 TC 0 Z9 0 U1 0 U2 0 PU UNIVELT INC PI SAN DIEGO PA PO BOX 28130, SAN DIEGO, CA 92128 SN 0065-3438 BN 0-87703-380-3 J9 ADV ASTRONAUT SCI PY 1994 VL 85 BP 1587 EP 1607 PN 1-3 PG 21 WC Engineering, Aerospace SC Engineering GA BA73X UT WOS:A1994BA73X00092 ER PT S AU EDWARDS, C ANDERSON, J BEYER, P BHASKARAN, S BORDER, J DINARDO, S FOLKNER, W HAW, R NANDI, S NICHOLSON, F OTTENHOFF, C STEPHENS, S AF EDWARDS, C ANDERSON, J BEYER, P BHASKARAN, S BORDER, J DINARDO, S FOLKNER, W HAW, R NANDI, S NICHOLSON, F OTTENHOFF, C STEPHENS, S BE Misra, AK Modi, VJ Holdaway, R Bainum, PM TI TRACKING GALILEO AT EARTH-2 PERIGEE USING THE TRACKING AND DELAY RELAY SATELLITE SYSTEM SO ASTRODYNAMICS 1993, PTS 1-3 SE ADVANCES IN THE ASTRONAUTICAL SCIENCES LA English DT Proceedings Paper CT AAS/AIAA Astrodynamics Conference CY AUG 16-19, 1993 CL VICTORIA, CANADA SP AMER ASTRONAUT SOC, AMER INST AERONAUT & ASTRONAUT C1 JET PROP LAB,TDA TECHNOL DEV,PASADENA,CA 91109. NR 0 TC 5 Z9 5 U1 0 U2 0 PU UNIVELT INC PI SAN DIEGO PA PO BOX 28130, SAN DIEGO, CA 92128 SN 0065-3438 BN 0-87703-380-3 J9 ADV ASTRONAUT SCI PY 1994 VL 85 BP 1609 EP 1620 PN 1-3 PG 12 WC Engineering, Aerospace SC Engineering GA BA73X UT WOS:A1994BA73X00093 ER PT S AU HAW, RJ KALLEMEYN, PH NICHOLSON, FT DAVIS, RP RIEDEL, JE AF HAW, RJ KALLEMEYN, PH NICHOLSON, FT DAVIS, RP RIEDEL, JE BE Misra, AK Modi, VJ Holdaway, R Bainum, PM TI GALILEO SATELLITE TOUR - ORBIT DETERMINATION SO ASTRODYNAMICS 1993, PTS 1-3 SE ADVANCES IN THE ASTRONAUTICAL SCIENCES LA English DT Proceedings Paper CT AAS/AIAA Astrodynamics Conference CY AUG 16-19, 1993 CL VICTORIA, CANADA SP AMER ASTRONAUT SOC, AMER INST AERONAUT & ASTRONAUT C1 JET PROP LAB,NAVIGAT SYST,PASADENA,CA 91109. NR 0 TC 0 Z9 0 U1 0 U2 0 PU UNIVELT INC PI SAN DIEGO PA PO BOX 28130, SAN DIEGO, CA 92128 SN 0065-3438 BN 0-87703-380-3 J9 ADV ASTRONAUT SCI PY 1994 VL 85 BP 1621 EP 1634 PN 1-3 PG 14 WC Engineering, Aerospace SC Engineering GA BA73X UT WOS:A1994BA73X00094 ER PT S AU MCELRATH, TP THURMAN, SW CRIDDLE, KE AF MCELRATH, TP THURMAN, SW CRIDDLE, KE BE Misra, AK Modi, VJ Holdaway, R Bainum, PM TI NAVIGATION DEMONSTRATIONS OF PRECISION RANGING WITH THE ULYSSES SPACECRAFT SO ASTRODYNAMICS 1993, PTS 1-3 SE ADVANCES IN THE ASTRONAUTICAL SCIENCES LA English DT Proceedings Paper CT AAS/AIAA Astrodynamics Conference CY AUG 16-19, 1993 CL VICTORIA, CANADA SP AMER ASTRONAUT SOC, AMER INST AERONAUT & ASTRONAUT C1 JET PROP LAB,NAVIGAT SYST SECT,TECH STAFF,ULYSSES NAVIGAT TEAM,PASADENA,CA 91109. NR 0 TC 2 Z9 2 U1 0 U2 0 PU UNIVELT INC PI SAN DIEGO PA PO BOX 28130, SAN DIEGO, CA 92128 SN 0065-3438 BN 0-87703-380-3 J9 ADV ASTRONAUT SCI PY 1994 VL 85 BP 1635 EP 1650 PN 1-3 PG 16 WC Engineering, Aerospace SC Engineering GA BA73X UT WOS:A1994BA73X00095 ER PT S AU GRAMLING, CJ HART, RC TELES, J LONG, AC SANTORO, EJ HORSTKAMP, GM OTTENSTEIN, NA AF GRAMLING, CJ HART, RC TELES, J LONG, AC SANTORO, EJ HORSTKAMP, GM OTTENSTEIN, NA BE Misra, AK Modi, VJ Holdaway, R Bainum, PM TI FLIGHT QUALIFICATION OF THE TDRSS ONBOARD NAVIGATION SYSTEM (TONS) SO ASTRODYNAMICS 1993, PTS 1-3 SE ADVANCES IN THE ASTRONAUTICAL SCIENCES LA English DT Proceedings Paper CT AAS/AIAA Astrodynamics Conference CY AUG 16-19, 1993 CL VICTORIA, CANADA SP AMER ASTRONAUT SOC, AMER INST AERONAUT & ASTRONAUT C1 NASA,GODDARD SPACE FLIGHT CTR,FLIGHT DYNAM SUPPORT BRANCH,GREENBELT,MD 20771. NR 0 TC 0 Z9 0 U1 0 U2 0 PU UNIVELT INC PI SAN DIEGO PA PO BOX 28130, SAN DIEGO, CA 92128 SN 0065-3438 BN 0-87703-380-3 J9 ADV ASTRONAUT SCI PY 1994 VL 85 BP 1667 EP 1683 PN 1-3 PG 17 WC Engineering, Aerospace SC Engineering GA BA73X UT WOS:A1994BA73X00097 ER PT S AU RYNE, MS MOTTINGER, NA MENON, PR MILLER, JK AF RYNE, MS MOTTINGER, NA MENON, PR MILLER, JK BE Misra, AK Modi, VJ Holdaway, R Bainum, PM TI NAVIGATION OF PIONEER-12 DURING ATMOSPHERIC REENTRY AT VENUS SO ASTRODYNAMICS 1993, PTS 1-3 SE ADVANCES IN THE ASTRONAUTICAL SCIENCES LA English DT Proceedings Paper CT AAS/AIAA Astrodynamics Conference CY AUG 16-19, 1993 CL VICTORIA, CANADA SP AMER ASTRONAUT SOC, AMER INST AERONAUT & ASTRONAUT C1 JET PROP LAB,NAVIGAT SYST SECT,TECH STAFF,PASADENA,CA 91109. NR 0 TC 1 Z9 1 U1 0 U2 0 PU UNIVELT INC PI SAN DIEGO PA PO BOX 28130, SAN DIEGO, CA 92128 SN 0065-3438 BN 0-87703-380-3 J9 ADV ASTRONAUT SCI PY 1994 VL 85 BP 1699 EP 1716 PN 1-3 PG 18 WC Engineering, Aerospace SC Engineering GA BA73X UT WOS:A1994BA73X00099 ER PT S AU LEAVITT, RK SALAMA, AH AF LEAVITT, RK SALAMA, AH BE Misra, AK Modi, VJ Holdaway, R Bainum, PM TI DESIGN AND IMPLEMENTATION OF SOFTWARE ALGORITHMS FOR TOPEX POSEIDON ONBOARD EPHEMERIS REPRESENTATIONS SO ASTRODYNAMICS 1993, PTS 1-3 SE ADVANCES IN THE ASTRONAUTICAL SCIENCES LA English DT Proceedings Paper CT AAS/AIAA Astrodynamics Conference CY AUG 16-19, 1993 CL VICTORIA, CANADA SP AMER ASTRONAUT SOC, AMER INST AERONAUT & ASTRONAUT C1 JET PROP LAB,STARLING SOFTWARE,PASADENA,CA 91109. NR 0 TC 0 Z9 0 U1 0 U2 0 PU UNIVELT INC PI SAN DIEGO PA PO BOX 28130, SAN DIEGO, CA 92128 SN 0065-3438 BN 0-87703-380-3 J9 ADV ASTRONAUT SCI PY 1994 VL 85 BP 2519 EP 2533 PN 1-3 PG 15 WC Engineering, Aerospace SC Engineering GA BA73X UT WOS:A1994BA73X00150 ER PT S AU SALAMA, AH LEAVITT, RK AF SALAMA, AH LEAVITT, RK BE Misra, AK Modi, VJ Holdaway, R Bainum, PM TI TOPEX POSEIDON ON-BOARD EPHEMERIS REPRESENTATION PROCEDURE, PERFORMANCE, AND EXPERIENCE SO ASTRODYNAMICS 1993, PTS 1-3 SE ADVANCES IN THE ASTRONAUTICAL SCIENCES LA English DT Proceedings Paper CT AAS/AIAA Astrodynamics Conference CY AUG 16-19, 1993 CL VICTORIA, CANADA SP AMER ASTRONAUT SOC, AMER INST AERONAUT & ASTRONAUT C1 JET PROP LAB,TECH STAFF,PASADENA,CA 91109. NR 0 TC 0 Z9 0 U1 0 U2 0 PU UNIVELT INC PI SAN DIEGO PA PO BOX 28130, SAN DIEGO, CA 92128 SN 0065-3438 BN 0-87703-380-3 J9 ADV ASTRONAUT SCI PY 1994 VL 85 BP 2535 EP 2548 PN 1-3 PG 14 WC Engineering, Aerospace SC Engineering GA BA73X UT WOS:A1994BA73X00151 ER PT B AU MCGLYNN, TA WHITE, NE SCOLLICK, K STURCH, C AF MCGLYNN, TA WHITE, NE SCOLLICK, K STURCH, C BE Crabtree, DR Hanisch, RJ Barnes, J TI SkyView: An all-sky data service SO ASTRONOMICAL DATA ANALYSIS SOFTWARE AND SYSTEMS, III SE ASTRONOMICAL SOCIETY OF THE PACIFIC CONFERENCE SERIES LA English DT Proceedings Paper CT 3rd Annual Conference on Astronomical Data Analysis Software and Systems (ADASS III) CY OCT 13-15, 1993 CL VICTORIA, CANADA SP Natl Opt Astron Observ, Natl Res Council Canada, Smithsonian Astrophys Observ, Univ Victoria, Space Telescope Sci Inst, APUNIX, Barrodale Computing Serv Ltd., Digidyne Inc, Digital Equipment, NCD Inc, Silicon Graph Canada Inc, SYBASE Canada Inc, ZED Date C1 NASA,GODDARD SPACE FLIGHT CTR,GREENBELT,MD 20771. RI White, Nicholas/B-6428-2012 OI White, Nicholas/0000-0003-3853-3462 NR 0 TC 25 Z9 25 U1 0 U2 0 PU ASTRONOMICAL SOC PACIFIC PI SAN FRANCISCO PA 390 ASHTON AVE, SAN FRANCISCO, CA 94112 BN 0-937707-80-5 J9 ASTR SOC P PY 1994 VL 61 BP 34 EP 37 PG 4 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA BD88B UT WOS:A1994BD88B00008 ER PT B AU RICHMOND, A AF RICHMOND, A BE Crabtree, DR Hanisch, RJ Barnes, J TI Towards an astrophysical cyberspace: The evolution of user interfaces SO ASTRONOMICAL DATA ANALYSIS SOFTWARE AND SYSTEMS, III SE ASTRONOMICAL SOCIETY OF THE PACIFIC CONFERENCE SERIES LA English DT Proceedings Paper CT 3rd Annual Conference on Astronomical Data Analysis Software and Systems (ADASS III) CY OCT 13-15, 1993 CL VICTORIA, CANADA SP Natl Opt Astron Observ, Natl Res Council Canada, Smithsonian Astrophys Observ, Univ Victoria, Space Telescope Sci Inst, APUNIX, Barrodale Computing Serv Ltd., Digidyne Inc, Digital Equipment, NCD Inc, Silicon Graph Canada Inc, SYBASE Canada Inc, ZED Date C1 NASA,GODDARD SPACE FLIGHT CTR,HUGHES STX,NEASARC,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 0-937707-80-5 J9 ASTR SOC P PY 1994 VL 61 BP 55 EP 58 PG 4 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA BD88B UT WOS:A1994BD88B00013 ER PT B AU RICHMOND, A YOM, S JACOBS, P DUESTERHAUS, M BRISCO, P AF RICHMOND, A YOM, S JACOBS, P DUESTERHAUS, M BRISCO, P BE Crabtree, DR Hanisch, RJ Barnes, J TI StarTrax - The next generation browse SO ASTRONOMICAL DATA ANALYSIS SOFTWARE AND SYSTEMS, III SE ASTRONOMICAL SOCIETY OF THE PACIFIC CONFERENCE SERIES LA English DT Proceedings Paper CT 3rd Annual Conference on Astronomical Data Analysis Software and Systems (ADASS III) CY OCT 13-15, 1993 CL VICTORIA, CANADA SP Natl Opt Astron Observ, Natl Res Council Canada, Smithsonian Astrophys Observ, Univ Victoria, Space Telescope Sci Inst, APUNIX, Barrodale Computing Serv Ltd., Digidyne Inc, Digital Equipment, NCD Inc, Silicon Graph Canada Inc, SYBASE Canada Inc, ZED Date C1 NASA,GODDARD SPACE FLIGHT CTR,HUGHES STX,HEASARC,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 0-937707-80-5 J9 ASTR SOC P PY 1994 VL 61 BP 59 EP 62 PG 4 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA BD88B UT WOS:A1994BD88B00014 ER PT B AU JORDAN, JM JENNINGS, DG MCGLYNN, TA BONNELL, JT GLIBA, GW RUGGIERO, NG SERLEMITSOS, TA AF JORDAN, JM JENNINGS, DG MCGLYNN, TA BONNELL, JT GLIBA, GW RUGGIERO, NG SERLEMITSOS, TA BE Crabtree, DR Hanisch, RJ Barnes, J TI An Xwindows/Motif graphical user interface for Xspec SO ASTRONOMICAL DATA ANALYSIS SOFTWARE AND SYSTEMS, III SE ASTRONOMICAL SOCIETY OF THE PACIFIC CONFERENCE SERIES LA English DT Proceedings Paper CT 3rd Annual Conference on Astronomical Data Analysis Software and Systems (ADASS III) CY OCT 13-15, 1993 CL VICTORIA, CANADA SP Natl Opt Astron Observ, Natl Res Council Canada, Smithsonian Astrophys Observ, Univ Victoria, Space Telescope Sci Inst, APUNIX, Barrodale Computing Serv Ltd., Digidyne Inc, Digital Equipment, NCD Inc, Silicon Graph Canada Inc, SYBASE Canada Inc, ZED Date C1 NASA,GODDARD SPACE FLIGHT CTR,COSSC,CSC,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 0-937707-80-5 J9 ASTR SOC P PY 1994 VL 61 BP 71 EP 74 PG 4 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA BD88B UT WOS:A1994BD88B00017 ER PT B AU SCHMITZ, M HELOU, G MADORE, BF CORWIN, HG BENNETT, J WU, X AF SCHMITZ, M HELOU, G MADORE, BF CORWIN, HG BENNETT, J WU, X BE Crabtree, DR Hanisch, RJ Barnes, J TI Astronomy and databases: A symbiotic relationship SO ASTRONOMICAL DATA ANALYSIS SOFTWARE AND SYSTEMS, III SE ASTRONOMICAL SOCIETY OF THE PACIFIC CONFERENCE SERIES LA English DT Proceedings Paper CT 3rd Annual Conference on Astronomical Data Analysis Software and Systems (ADASS III) CY OCT 13-15, 1993 CL VICTORIA, CANADA SP Natl Opt Astron Observ, Natl Res Council Canada, Smithsonian Astrophys Observ, Univ Victoria, Space Telescope Sci Inst, APUNIX, Barrodale Computing Serv Ltd., Digidyne Inc, Digital Equipment, NCD Inc, Silicon Graph Canada Inc, SYBASE Canada Inc, ZED Date C1 CALTECH,JET PROPULS LAB,PASADENA,CA 91125. 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 0-937707-80-5 J9 ASTR SOC P PY 1994 VL 61 BP 111 EP 114 PG 4 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA BD88B UT WOS:A1994BD88B00027 ER PT B AU SMITH, EP PICA, AJ BOHLIN, RC FANELLI, MK OCONNELL, RW ROBERTS, MS SMITH, AM STECHER, TP AF SMITH, EP PICA, AJ BOHLIN, RC FANELLI, MK OCONNELL, RW ROBERTS, MS SMITH, AM STECHER, TP BE Crabtree, DR Hanisch, RJ Barnes, J TI The UIT bright objects catalog SO ASTRONOMICAL DATA ANALYSIS SOFTWARE AND SYSTEMS, III SE ASTRONOMICAL SOCIETY OF THE PACIFIC CONFERENCE SERIES LA English DT Proceedings Paper CT 3rd Annual Conference on Astronomical Data Analysis Software and Systems (ADASS III) CY OCT 13-15, 1993 CL VICTORIA, CANADA SP Natl Opt Astron Observ, Natl Res Council Canada, Smithsonian Astrophys Observ, Univ Victoria, Space Telescope Sci Inst, APUNIX, Barrodale Computing Serv Ltd., Digidyne Inc, Digital Equipment, NCD Inc, Silicon Graph Canada Inc, SYBASE Canada Inc, ZED Date 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 0-937707-80-5 J9 ASTR SOC P PY 1994 VL 61 BP 227 EP 230 PG 4 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA BD88B UT WOS:A1994BD88B00050 ER PT B AU ROTS, AH AF ROTS, AH BE Crabtree, DR Hanisch, RJ Barnes, J TI The design of an intelligent FITS file database SO ASTRONOMICAL DATA ANALYSIS SOFTWARE AND SYSTEMS, III SE ASTRONOMICAL SOCIETY OF THE PACIFIC CONFERENCE SERIES LA English DT Proceedings Paper CT 3rd Annual Conference on Astronomical Data Analysis Software and Systems (ADASS III) CY OCT 13-15, 1993 CL VICTORIA, CANADA SP Natl Opt Astron Observ, Natl Res Council Canada, Smithsonian Astrophys Observ, Univ Victoria, Space Telescope Sci Inst, APUNIX, Barrodale Computing Serv Ltd., Digidyne Inc, Digital Equipment, NCD Inc, Silicon Graph Canada Inc, SYBASE Canada Inc, ZED Date C1 NASA,GODDARD SPACE FLIGHT CTR,XTE GUEST OBSERVER FACIL,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 0-937707-80-5 J9 ASTR SOC P PY 1994 VL 61 BP 231 EP 234 PG 4 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA BD88B UT WOS:A1994BD88B00051 ER PT B AU PEDELTY, JA APPLETON, PN BASART, JP AF PEDELTY, JA APPLETON, PN BASART, JP BE Crabtree, DR Hanisch, RJ Barnes, J TI Morphological filtering of infrared cirrus emission using the MasPar SO ASTRONOMICAL DATA ANALYSIS SOFTWARE AND SYSTEMS, III SE ASTRONOMICAL SOCIETY OF THE PACIFIC CONFERENCE SERIES LA English DT Proceedings Paper CT 3rd Annual Conference on Astronomical Data Analysis Software and Systems (ADASS III) CY OCT 13-15, 1993 CL VICTORIA, CANADA SP Natl Opt Astron Observ, Natl Res Council Canada, Smithsonian Astrophys Observ, Univ Victoria, Space Telescope Sci Inst, APUNIX, Barrodale Computing Serv Ltd., Digidyne Inc, Digital Equipment, NCD Inc, Silicon Graph Canada Inc, SYBASE Canada Inc, ZED Date C1 NASA,GODDARD SPACE FLIGHT CTR,DIV SPACE DATA & COMP,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 0-937707-80-5 J9 ASTR SOC P PY 1994 VL 61 BP 308 EP 311 PG 4 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA BD88B UT WOS:A1994BD88B00070 ER PT B AU BABST, KL HOLLENHORST, RJ STEPHENS, JE AF BABST, KL HOLLENHORST, RJ STEPHENS, JE BE Crabtree, DR Hanisch, RJ Barnes, J TI Retrospective of the software metrics and staffing profile for COBE ground system software SO ASTRONOMICAL DATA ANALYSIS SOFTWARE AND SYSTEMS, III SE ASTRONOMICAL SOCIETY OF THE PACIFIC CONFERENCE SERIES LA English DT Proceedings Paper CT 3rd Annual Conference on Astronomical Data Analysis Software and Systems (ADASS III) CY OCT 13-15, 1993 CL VICTORIA, CANADA SP Natl Opt Astron Observ, Natl Res Council Canada, Smithsonian Astrophys Observ, Univ Victoria, Space Telescope Sci Inst, APUNIX, Barrodale Computing Serv Ltd., Digidyne Inc, Digital Equipment, NCD Inc, Silicon Graph Canada Inc, SYBASE Canada Inc, ZED Date C1 GODDARD SPACE FLIGHT CTR,COMP SCI CORP,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 0-937707-80-5 J9 ASTR SOC P PY 1994 VL 61 BP 515 EP 518 PG 4 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA BD88B UT WOS:A1994BD88B00115 ER PT B AU PENCE, WD AF PENCE, WD BE Crabtree, DR Hanisch, RJ Barnes, J TI FITS image compression using variable length binary tables SO ASTRONOMICAL DATA ANALYSIS SOFTWARE AND SYSTEMS, III SE ASTRONOMICAL SOCIETY OF THE PACIFIC CONFERENCE SERIES LA English DT Proceedings Paper CT 3rd Annual Conference on Astronomical Data Analysis Software and Systems (ADASS III) CY OCT 13-15, 1993 CL VICTORIA, CANADA SP Natl Opt Astron Observ, Natl Res Council Canada, Smithsonian Astrophys Observ, Univ Victoria, Space Telescope Sci Inst, APUNIX, Barrodale Computing Serv Ltd., Digidyne Inc, Digital Equipment, NCD Inc, Silicon Graph Canada Inc, SYBASE Canada Inc, ZED Date 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 0-937707-80-5 J9 ASTR SOC P PY 1994 VL 61 BP 523 EP 525 PG 3 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA BD88B UT WOS:A1994BD88B00117 ER PT B AU JENNINGS, DG MCGLYNN, TA JORDAN, JM AF JENNINGS, DG MCGLYNN, TA JORDAN, JM BE Crabtree, DR Hanisch, RJ Barnes, J TI Investigating HDF as an astronomical transport and archival format SO ASTRONOMICAL DATA ANALYSIS SOFTWARE AND SYSTEMS, III SE ASTRONOMICAL SOCIETY OF THE PACIFIC CONFERENCE SERIES LA English DT Proceedings Paper CT 3rd Annual Conference on Astronomical Data Analysis Software and Systems (ADASS III) CY OCT 13-15, 1993 CL VICTORIA, CANADA SP Natl Opt Astron Observ, Natl Res Council Canada, Smithsonian Astrophys Observ, Univ Victoria, Space Telescope Sci Inst, APUNIX, Barrodale Computing Serv Ltd., Digidyne Inc, Digital Equipment, NCD Inc, Silicon Graph Canada Inc, SYBASE Canada Inc, ZED Date C1 NASA,GODDARD SPACE FLIGHT CTR,CSC,CTR SCI SUPPORT,COMPTON OBSERV,GREENBELT,MD 20771. NR 0 TC 0 Z9 1 U1 0 U2 0 PU ASTRONOMICAL SOC PACIFIC PI SAN FRANCISCO PA 390 ASHTON AVE, SAN FRANCISCO, CA 94112 BN 0-937707-80-5 J9 ASTR SOC P PY 1994 VL 61 BP 526 EP 529 PG 4 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA BD88B UT WOS:A1994BD88B00118 ER PT J AU GOLDSTEIN, SJ GOLDSTEIN, RM AF GOLDSTEIN, SJ GOLDSTEIN, RM TI SOME PROPERTIES OF MILLIMETRIC SPACE DEBRIS SO ASTRONOMICAL JOURNAL LA English DT Article AB We describe radar observations at 8510 MHz of 39 small particles in Earth orbit. The altitudes vary between 510 and 1550 km, while the radial velocities lie between -310 and +520 m/s. Regarding all the observations as belonging to one statistical population, we calculate with the principle of least squares a best fitting semimajor axis and eccentricity. The semimajor axis is (7450+98/-92) km, while the eccentricity is (0.039+0.012/-0.016). C1 JET PROP LAB,PASADENA,CA 91109. RP GOLDSTEIN, SJ (reprint author), UNIV VIRGINIA,LEANDER MCCORMICK OBSERV,CHARLOTTESVILLE,VA 22903, USA. NR 3 TC 4 Z9 4 U1 0 U2 1 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0004-6256 J9 ASTRON J JI Astron. J. PD JAN PY 1994 VL 107 IS 1 BP 367 EP 371 DI 10.1086/116859 PG 5 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA MN952 UT WOS:A1994MN95200030 ER PT J AU RUSSELL, JL REYNOLDS, JE JAUNCEY, DL DEVEGT, C ZACHARIAS, N MA, C FEY, AL JOHNSTON, KJ HINDSLEY, R HUGHES, JA MALIN, DF WHITE, GL KAWAGUCHI, N TAKAHASHI, Y AF RUSSELL, JL REYNOLDS, JE JAUNCEY, DL DEVEGT, C ZACHARIAS, N MA, C FEY, AL JOHNSTON, KJ HINDSLEY, R HUGHES, JA MALIN, DF WHITE, GL KAWAGUCHI, N TAKAHASHI, Y TI A RADIO OPTICAL REFERENCE FRAME .5. ADDITIONAL SOURCE POSITIONS IN THE MIDLATITUDE SOUTHERN-HEMISPHERE SO ASTRONOMICAL JOURNAL LA English DT Article ID NORTHERN-HEMISPHERE; CATALOG AB We report new accurate radio position measurements for 30 sources, preliminary positions for two sources, improved radio positions for nine additional sources which had limited previous observations, and optical positions and optical-radio differences for six of the radio sources. The VLBI observations are part of the continuing effort to establish a global radio reference frame of about 400 compact, flat spectrum sources, which are evenly distributed across the sky. The observations were made using Mark III data format in four separate sessions in 1988-89 with radio telescopes at Tidbinbilla, Australia, Kauai, USA, and Kashima, Japan. We observed a total of 54 sources, including ten calibrators and three which were undetected. The 32 new source positions bring the total number in the radio reference frame catalog to 319 (172 northern and 147 southern) and fill in the zone -25-degrees > delta > -45-degrees which, prior to this list, had the lowest source density. The VLBI positions have an average formal precision of less than 1 mas, although unknown radio structure effects of approximately 1-2 mas may be present. The six new optical position measurements are part of the program to obtain positions of the optical counterparts of the radio reference frame sources and to map accurately the optical on to the radio reference frames. The optical measurements were obtained from USNO Black Birch astrograph plates and source plates from the AAT, and KPNO 4 m, and the ESO Schmidt. The optical positions have an average precision of 0.07'', mostly due to the zero point error when adjusted to the FK5 optical frame using the IRS catalog. To date we have measured optical positions for 46 sources. C1 CSIRO,AUSTRALIA TELESCOPE NATL FACIL,EPPING,NSW 2121,AUSTRALIA. UNIV HAMBURG,HAMBURGER STERNWARTE,W-2000 HAMBURG 13,GERMANY. NASA,GODDARD SPACE FLIGHT CTR,GREENBELT,MD 20771. USN,RES LAB,WASHINGTON,DC 20375. ANGLO AUSTRALIAN OBSERV,COONABARABRAN,NSW,AUSTRALIA. UNIV WESTERN SYDNEY,NEPEAN,NSW,AUSTRALIA. COMMUN RES LABS,KASHIMA,JAPAN. RP RUSSELL, JL (reprint author), APPL RES CORP,LANDOVER,MD 20785, USA. RI Ma, Chopo/D-4751-2012 NR 15 TC 14 Z9 14 U1 0 U2 0 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0004-6256 J9 ASTRON J JI Astron. J. PD JAN PY 1994 VL 107 IS 1 BP 379 EP 384 DI 10.1086/116861 PG 6 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA MN952 UT WOS:A1994MN95200032 ER PT J AU FEY, AL RUSSELL, JL DEVEGT, C ZACHARIAS, N JOHNSTON, KJ MA, C HALL, DM HOLDENRIED, ER AF FEY, AL RUSSELL, JL DEVEGT, C ZACHARIAS, N JOHNSTON, KJ MA, C HALL, DM HOLDENRIED, ER TI RADIO OPTICAL REFERENCE FRAME .6. ADDITIONAL SOURCE POSITIONS IN THE NORTHERN-HEMISPHERE SO ASTRONOMICAL JOURNAL LA English DT Article ID CATALOG; VLBI AB Radio and optical positions for northem hemisphere extragalactic sources are reported. Milliarcsecond (mas) accurate radio positions of 106 sources north of -2-degrees declination are derived from Mark III VLBI observations taken during ten experiments from 1990 January through 1990 October. The results presented supplement an ongoing project to define and maintain an all-sky radio/optical reference frame of 400 or more extragalactic sources with mas accurate radio and optical positions. Radio positions for 34 new sources are presented along with improved radio positions for 72 sources already in the reference frame catalogue. An additional nine sources have been determined to be unsuitable reference frame objects. Radio observations of nine calibration sources tie the new positions to the existing catalogue. The radio positions of the new sources have formal mean errors of approximately 0.7 mas in right ascension and approximately 1.0 mas in declination. Sources for which we report improved radio positions now have formal mean errors of approximately 0.5 mas in both coordinates, an improvement in some cases by as much as 75%. Positions in the FK5 system have also been obtained for the optical counterparts of an additional five northern hemisphere radio sources using prime focus plates from the Kitt Peak National Observatory's 4 m telescope and a Ritchey-Chretien focus plate from the Calar Alto 2.2 m telescope. The optical positions have internal accuracies of approximately 0.''03 and differ from the radio positions by approximately 0.07'' on the average. C1 APPL RES CORP,LANDOVER,MD 20785. UNIV HAMBURG,HAMBURGER STERNWARTE,W-2000 HAMBURG 13,GERMANY. NASA,GODDARD SPACE FLIGHT CTR,GREENBELT,MD 20771. RP FEY, AL (reprint author), USN,RES LAB,WASHINGTON,DC 20375, USA. RI Ma, Chopo/D-4751-2012 NR 14 TC 9 Z9 9 U1 0 U2 0 PU AMER INST PHYSICS PI WOODBURY PA CIRCULATION FULFILLMENT DIV, 500 SUNNYSIDE BLVD, WOODBURY, NY 11797-2999 SN 0004-6256 J9 ASTRON J JI Astron. J. PD JAN PY 1994 VL 107 IS 1 BP 385 EP 391 DI 10.1086/116862 PG 7 WC Astronomy & Astrophysics SC Astronomy & Astrophysics GA MN952 UT WOS:A1994MN95200033 ER PT S AU RHODES, EJ AF RHODES, EJ BE Foing, BH TI HELIOSEISMOLOGY ON THE MOON SO ASTRONOMY AND SPACE SCIENCE FROM THE MOON SE ADVANCES IN SPACE RESEARCH LA English DT Article; Proceedings Paper CT Symposium E4 of the COSPAR 29th Plenary Meeting on Astronomy and Space Science from the Moon CY AUG 28-SEP 05, 1992 CL WASHINGTON, DC SP COSPAR, INT ACAD ASTRON, INT ASTRON UNION, CTR NATL ETUDES SPATIALES, EUROPEAN SPACE AGCY, NASA AB The prospect of a future manned lunar base presents an interesting challenge for helioseismology-a field in which observations have been obtained from the Earth's surface, from near-earth satellites, and from interplanetary spacecraft. Similar observations from the Moon would possess several advantages over those from other sites. Advantages over the Earth would include the absence of the terrestrial atmosphere and the lower lunar surface gravity, both of which would allow for larger-aperture telescopes with which the highest-degree solar oscillations could be studied. Compared with the .99 AU halo orbit of the upcoming SOHO mission a lunar base would have less-restrictive weight, power, and telemetry restrictions. An instrument there could also be repaired in-place and could be operated for at least one solar cycle. Disadvantages compared to SOKO would include interruptions from the lunar night and during lunar eclipses. Temporal sidelobes of frequency spacing comparable to that due to solar surface rotation would be introduced unless a network of lunar stations were operated. Finally, solar Doppler measurements made from the Moon would have to allow for the orbital velocity of the Moon around the Earth, but this should not pose a problem for such measurements. C1 CALTECH,JET PROP LAB,SPACE PHYS & ASTROPHYS SECT,PASADENA,CA 91109. RP RHODES, EJ (reprint author), UNIV SO CALIF,DEPT PHYS & ASTRON,LOS ANGELES,CA 90089, USA. NR 6 TC 0 Z9 0 U1 0 U2 0 PU PERGAMON PRESS LTD PI OXFORD PA THE BOULEVARD LANGFORD LANE KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0273-1177 BN 0-08-042483-X J9 ADV SPACE RES PY 1994 VL 14 IS 6 BP 21 EP 31 DI 10.1016/0273-1177(94)90003-5 PG 11 WC Engineering, Aerospace; Astronomy & Astrophysics; Geosciences, Multidisciplinary; Meteorology & Atmospheric Sciences SC Engineering; Astronomy & Astrophysics; Geology; Meteorology & Atmospheric Sciences GA BA12C UT WOS:A1994BA12C00002 ER PT S AU DAVIS, JM AF DAVIS, JM BE Foing, BH TI PREDICTION OF SOLAR-FLARES FOR THE SPACE EXPLORATION INITIATIVE SO ASTRONOMY AND SPACE SCIENCE FROM THE MOON SE ADVANCES IN SPACE RESEARCH LA English DT Article; Proceedings Paper CT Symposium E4 of the COSPAR 29th Plenary Meeting on Astronomy and Space Science from the Moon CY AUG 28-SEP 05, 1992 CL WASHINGTON, DC SP COSPAR, INT ACAD ASTRON, INT ASTRON UNION, CTR NATL ETUDES SPATIALES, EUROPEAN SPACE AGCY, NASA ID MAGNETIC-FIELDS AB The 21st century is likely to see the start of the manned exploration and settlement of the inner solar system. NASA's plans for this endeavor are focused upon the Space Exploration Initiative which calls for a return to the Moon, to stay, followed by manned missions to Mars. To execute these missions safely provides solar physics with both a challenge and an opportunity. As the past solar maximum has clearly demonstrated, the Sun, through the solar flare process, is capable of generating and accelerating to high energies large fluxes of protons whose cummulative dose to unprotected astronauts can be fatal. It will be the responsibility of solar physicists to develop an accurate physical description of the mechanisms of flare energy storage and release, and of particle acceleration and propagation through interplanetary space upon which to base a sound method of flare and energetic particle prediction. RP DAVIS, JM (reprint author), NASA,GEORGE C MARSHALL SPACE FLIGHT CTR,HUNTSVILLE,AL 35812, USA. NR 13 TC 0 Z9 0 U1 0 U2 0 PU PERGAMON PRESS LTD PI OXFORD PA THE BOULEVARD LANGFORD LANE KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0273-1177 BN 0-08-042483-X J9 ADV SPACE RES PY 1994 VL 14 IS 6 BP 33 EP 42 DI 10.1016/0273-1177(94)90004-3 PG 10 WC Engineering, Aerospace; Astronomy & Astrophysics; Geosciences, Multidisciplinary; Meteorology & Atmospheric Sciences SC Engineering; Astronomy & Astrophysics; Geology; Meteorology & Atmospheric Sciences GA BA12C UT WOS:A1994BA12C00003 ER PT S AU GENET, RM HINE, B DRUMMOND, M PATTERSONHINE, A BORUCKI, W BURNS, J GENET, D AF GENET, RM HINE, B DRUMMOND, M PATTERSONHINE, A BORUCKI, W BURNS, J GENET, D BE Foing, BH TI HIGH-RESOLUTION IMAGING AND PRECISION PHOTOMETRIC MEASUREMENTS FROM A SMALL SOFT-LANDED LUNAR TELESCOPE SO ASTRONOMY AND SPACE SCIENCE FROM THE MOON SE ADVANCES IN SPACE RESEARCH LA English DT Note CT Symposium E4 of the COSPAR 29th Plenary Meeting on Astronomy and Space Science from the Moon CY AUG 28-SEP 05, 1992 CL WASHINGTON, DC SP COSPAR, INT ACAD ASTRON, INT ASTRON UNION, CTR NATL ETUDES SPATIALES, EUROPEAN SPACE AGCY, NASA C1 NASA,AMES RES CTR,MOFFETT FIELD,CA 94035. NEW MEXICO STATE UNIV,DEPT ASTRON,LAS CRUCES,NM 88003. RP GENET, RM (reprint author), AUTOSCOPE CORP,3435 E EDGEWOOD AVE,MESA,AZ 85204, USA. NR 0 TC 0 Z9 0 U1 0 U2 0 PU PERGAMON PRESS LTD PI OXFORD PA THE BOULEVARD LANGFORD LANE KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0273-1177 BN 0-08-042483-X J9 ADV SPACE RES PY 1994 VL 14 IS 6 BP 115 EP 115 DI 10.1016/0273-1177(94)90015-9 PG 1 WC Engineering, Aerospace; Astronomy & Astrophysics; Geosciences, Multidisciplinary; Meteorology & Atmospheric Sciences SC Engineering; Astronomy & Astrophysics; Geology; Meteorology & Atmospheric Sciences GA BA12C UT WOS:A1994BA12C00014 ER PT S AU SWANSON, PN CUTTS, JA AF SWANSON, PN CUTTS, JA BE Foing, BH TI ASTRONOMICAL OBSERVATORIES ON THE MOON SO ASTRONOMY AND SPACE SCIENCE FROM THE MOON SE ADVANCES IN SPACE RESEARCH LA English DT Article; Proceedings Paper CT Symposium E4 of the COSPAR 29th Plenary Meeting on Astronomy and Space Science from the Moon CY AUG 28-SEP 05, 1992 CL WASHINGTON, DC SP COSPAR, INT ACAD ASTRON, INT ASTRON UNION, CTR NATL ETUDES SPATIALES, EUROPEAN SPACE AGCY, NASA AB The Space Exploration Initiative presents an opportunity to construct astronomical telescopes on the Moon using the infrastructure provided by the lunar outpost. Small automatically deployed telescopes can be carried on the survey missions, be deployed on the lunar surface and be operated remotely from the Earth. Possibilities for early, small optical telescopes are a zenith pointed transit telescope, a student telescope, and a 0.5 to 1 meter automatic, fully steerable telescope. After the lunar outpost is established the lunar interferometers will be constructed in an evolutionary fashion. There are three lunar interferometers which have been studied. The most ambitious is the optical interferometer with a 1 to 2-km baseline and seven 1.5-m aperture elements arranged in a ''Y'' configuration with a central beam combiner. The Submillimeter interferometer would use seven, 5-m reflectors in a ''Y'' or circular configuration with a 1-km baseline. The Very Low Frequency (VLF) array would operate below 30 mHz with as many as 100 elements and a 200-km baseline. RP SWANSON, PN (reprint author), CALTECH,JET PROP LAB,PASADENA,CA 91109, USA. NR 11 TC 1 Z9 1 U1 0 U2 0 PU PERGAMON PRESS LTD PI OXFORD PA THE BOULEVARD LANGFORD LANE KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0273-1177 BN 0-08-042483-X J9 ADV SPACE RES PY 1994 VL 14 IS 6 BP 123 EP 127 DI 10.1016/0273-1177(94)90017-5 PG 5 WC Engineering, Aerospace; Astronomy & Astrophysics; Geosciences, Multidisciplinary; Meteorology & Atmospheric Sciences SC Engineering; Astronomy & Astrophysics; Geology; Meteorology & Atmospheric Sciences GA BA12C UT WOS:A1994BA12C00016 ER PT S AU CHEN, PC PITTS, R SHORE, S OLIVERSEN, R STOLARIK, J SEGAL, K HOJAJI, H AF CHEN, PC PITTS, R SHORE, S OLIVERSEN, R STOLARIK, J SEGAL, K HOJAJI, H BE Foing, BH TI SUPERCONDUCTOR LUNAR TELESCOPES SO ASTRONOMY AND SPACE SCIENCE FROM THE MOON SE ADVANCES IN SPACE RESEARCH LA English DT Note CT Symposium E4 of the COSPAR 29th Plenary Meeting on Astronomy and Space Science from the Moon CY AUG 28-SEP 05, 1992 CL WASHINGTON, DC SP COSPAR, INT ACAD ASTRON, INT ASTRON UNION, CTR NATL ETUDES SPATIALES, EUROPEAN SPACE AGCY, NASA C1 NASA,GODDARD SPACE FLIGHT CTR,GREENBELT,MD 20771. NR 0 TC 0 Z9 0 U1 0 U2 0 PU PERGAMON PRESS LTD PI OXFORD PA THE BOULEVARD LANGFORD LANE KIDLINGTON, OXFORD, ENGLAND OX5 1GB SN 0273-1177 BN 0-08-042483-X J9 ADV SPACE RES PY 1994 VL 14 IS 6 BP 137 EP 137 DI 10.1016/0273-1177(94)90019-1 PG 1 WC Engineering, Aerospace; Astronomy & Astrophysics; Geosciences, Multidisciplinary; Meteorology & Atmospheric Sciences SC Engineering; Astronomy & Astrophysics; Geology; Meteorology & Atmospheric Sciences GA BA12C UT WOS:A1994BA12C00018 ER EF