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  • GEOPHYSICS  (121)
  • AERODYNAMICS  (79)
  • ENERGY PRODUCTION AND CONVERSION  (67)
  • ASTRONOMY  (50)
  • INSTRUMENTATION AND PHOTOGRAPHY  (45)
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  • 1977  (362)
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  • 1
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    National geodetic satellite program, part 1 (1977)
    In:  CASI
    Details
    Publikationsdatum: 2006-01-16
    Beschreibung: Equipment and techniques were evaluated operationally, by the Department of Defense, during the National Geodetic Satellite Program (NGSP). The theory, instrumentation, and data reduction methods used are described. Results obtained during the NGSP are given.
    Schlagwort(e): GEOPHYSICS
    Materialart: NASA, Washington Natl. Geodetic Satellite Program, Pt. 1; p 139-245
    Format: text
    Standort Signatur Erwartet Verfügbarkeit
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    NASA TECHNICAL REPORTS
  • 2
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    Spectral observations of Eta Carinae at 4 microns (1977)
    In:  Other Sources
    Details
    Publikationsdatum: 2019-06-27
    Beschreibung: Spectral observations of the central region of the Eta Carinae nebula at 4 microns have measured the Brackett-alpha hydrogen recombination-line intensity. The bulk of the line and continuum radiation arises in a small central source which is slightly narrower in the line radiation and is barely resolved by the employed beamwidth of 3.4 arcsec. The continuum radiation is well-fitted by an exponential relation to a distance of 10 arcsec from the central source. The line intensity requires a central source which emits 10 to the 49th power ionizing photons per sec into a region of electron density greater than 1 million per cu cm.
    Schlagwort(e): ASTRONOMY
    Materialart: Astrophysical Journal; vol. 217
    Format: text
    Standort Signatur Erwartet Verfügbarkeit
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    NASA TECHNICAL REPORTS
  • 3
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    Gamma-ray astronomy in the medium energy (10-50 MeV) range (1977)
    In:  Other Sources
    Details
    Publikationsdatum: 2011-08-17
    Beschreibung: To observe the medium energy component of the intense galactic center gamma-ray emission, two balloon flights of a medium energy gamma-ray spark chamber telescope were flown in Brazil in 1975. The results indicate the emission is higher than previously thought and above the predictions of a theoretical model proposed.
    Schlagwort(e): ASTRONOMY
    Materialart: ESA Recent Advan. in Gamma-Ray Astronomy; p 117-124
    Format: text
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    NASA TECHNICAL REPORTS
  • 4
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    Description and review of global measurements of atmospheric species from GASP (1977)
    In:  Other Sources
    Details
    Publikationsdatum: 2019-07-13
    Beschreibung: A large volume of atmospheric constituent data is being collected in the global airlanes by specially equipped B-747 aircraft. This NASA program also obtains data from the similarly equipped NASA CV-990 aircraft during dedicated flights such as a recent near pole-to-pole latitude survey mission. Aerosol composition data are also collected with a NASA F-106 aircraft. Present measurements include ozone, carbon monoxide, water vapor, aerosol and condensation nuclei number densities, sulphates, nitrates, and the chlorofluoromethanes. Meteorological and flight parameters are also recorded for use in data analysis. The present aircraft operations obtain data between 6 and 13.5 km from 65 deg N between Europe and the North Pacific, and from 23 deg S over South America and 42 deg S over New Zealand. Typical constituent data from the aircraft operations during the first one and a half years are presented. Instrumentation is discussed.
    Schlagwort(e): GEOPHYSICS
    Materialart: Conference on Air Quality Meteorology and Atmospheric Ozone; Jul 31, 1977 - Aug 06, 1977; Boulder, CO; US
    Format: text
    Standort Signatur Erwartet Verfügbarkeit
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  • 5
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    Dip-coating process: Silicon sheet growth development for the large-area silicon sheet task of the low-cost silicon solar array project (1977)
    In:  CASI
    Details
    Publikationsdatum: 2019-07-13
    Beschreibung: The objective of this research program is to investigate the technical and economic feasibility of producing solar-cell-quality sheet silicon by coating one surface of carbonized ceramic substrates with a thin layer of large-grain polycrystalline silicon from the melt. The past quarter demonstrated significant progress in several areas. Seeded growth of silicon-on-ceramic (SOC) with an EFG ribbon seed was demonstrated. Different types of mullite were successfully coated with silicon. A new method of deriving minority carrier diffusion length, L sub n from spectral response measurements was evaluated. ECOMOD cost projections were found to be in good agreement with the interim SAMIS method proposed by JPL. On the less positive side, there was a decrease in cell performance which we believe to be due to an unidentified source of impurities.
    Schlagwort(e): ENERGY PRODUCTION AND CONVERSION
    Materialart: NASA-CR-157072 , ERDA/JPL-954356-77/4 , HONEYWELL-QR-7
    Format: application/pdf
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  • 6
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    Silicon on ceramic process. Silicon sheet growth development for the large-area silicon sheet task of the low-cost silicon solar array project (1977)
    In:  CASI
    Details
    Publikationsdatum: 2019-07-13
    Beschreibung: The technical and economic feasibility of producing solar-cell-quality sheet silicon was investigated. The sheets were made by coating one surface of carbonized ceramic substrates with a thin layer of large-grain polycrystalline silicon from the melt. Significant progress was made in all areas of the program.
    Schlagwort(e): ENERGY PRODUCTION AND CONVERSION
    Materialart: NASA-CR-155613 , ERDA/JPL-954356-77/3 , AR-2
    Format: application/pdf
    Standort Signatur Erwartet Verfügbarkeit
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  • 7
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    Description and review of global measurements of atmospheric species from GASP (1977)
    In:  CASI
    Details
    Publikationsdatum: 2019-07-13
    Beschreibung: Aerosol composition data were collected with a NASA F-106 aircraft. Present measurements include ozone, carbon monoxide, water vapor, aerosol and condensation nuclei number densities, sulphates, nitrates, and the chlorofluoromethanes. Meteorological and flight parameters are also recorded for use in data analysis. The present aircraft operations obtain data between 6 and 13.5 km from 65 degree N between Europe and the north Pacific, and from 23 degree S over South America and 42 degree S over New Zealand. Typical constituent data from the aircraft operations during the first one and a half years are presented. Instrumentation is discussed.
    Schlagwort(e): GEOPHYSICS
    Materialart: NASA-TM-73781 , E-9338 , Conf. on Air Quality Meteorology and Atmospheric Ozone; Jul 31, 1977 - Aug 06, 1977; Boulder, CO; United States
    Format: application/pdf
    Standort Signatur Erwartet Verfügbarkeit
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    NASA TECHNICAL REPORTS
  • 8
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    Efficiency and cost advantages of an advanced-technology nuclear electrolytic hydrogen-energy production facility (1977)
    In:  Other Sources
    Details
    Publikationsdatum: 2019-07-13
    Beschreibung: The concept of an advanced-technology (viz., 1985 technology) nuclear-electrolytic water electrolysis facility was assessed for hydrogen production cost and efficiency expectations. The facility integrates (1) a high-temperature gas-cooled nuclear reactor (HTGR) operating a binary work cycle, (2) direct-current (d-c) electricity generation via acyclic generators, and (3) high-current-density, high-pressure electrolyzers using a solid polymer electrolyte (SPE). All subsystems are close-coupled and optimally interfaced for hydrogen production alone (i.e., without separate production of electrical power). Pipeline-pressure hydrogen and oxygen are produced at 6900 kPa (1000 psi). We found that this advanced facility would produce hydrogen at costs that were approximately half those associated with contemporary-technology nuclear electrolysis: $5.36 versus $10.86/million Btu, respectively. The nuclear-heat-to-hydrogen-energy conversion efficiency for the advanced system was estimated as 43%, versus 25% for the contemporary system.
    Schlagwort(e): ENERGY PRODUCTION AND CONVERSION
    Materialart: Symposium on Synthetic fuels processing: Comparative economics; Apr 04, 1976 - Apr 09, 1976; New York, NY
    Format: text
    Standort Signatur Erwartet Verfügbarkeit
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    NASA TECHNICAL REPORTS
  • 9
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    Experiments on transonic and supersonic turbulent boundary-layer separation (1977)
    In:  Other Sources
    Details
    Publikationsdatum: 2019-07-13
    Beschreibung: Results of experimental investigations into turbulent boundary-layer behavior under the influence of pressure gradients and with separation are presented for transonic and supersonic flow fields. In the transonic case, an axisymmetric model was implemented consisting of an annular circular arc bump affixed to a circular cylinder aligned with the flow direction. For the supersonic separation study, an oblique shock wave impinging on the wind tunnel wall boundary layer was employed to cause separation. The mean streamwise and normal velocity components as well as the respective turbulence intensities were obtained with a two-color frequency shifted laser velocimeter.
    Schlagwort(e): AERODYNAMICS
    Materialart: AIAA PAPER 77-47 , Aerospace Sciences Meeting; Jan 24, 1977 - Jan 26, 1977; Los Angeles, CA
    Format: text
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  • 10
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    Recent developments in parallel-grid, gas-scintillation proportional counters (1977)
    In:  Other Sources
    Details
    Publikationsdatum: 2019-06-27
    Beschreibung: The problems of developing large-area, gas-scintillation proportional counters with high resolution are considered. It is found that simple large-area, parallel-grid proportional counters suffer from a variation in gain over the counter window. Some success has been achieved in overcoming this problem by focusing the charge cloud as it drifts into the multiplication region. Measurements are reported for various mixtures of argon and xenon as well as pure xenon.
    Schlagwort(e): INSTRUMENTATION AND PHOTOGRAPHY
    Format: text
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