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  • Other Sources  (641)
  • ENERGY PRODUCTION AND CONVERSION  (351)
  • SOLAR PHYSICS  (290)
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  • 1975-1979  (641)
  • 1
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    Dual membrane hollow fiber fuel cell and method of operating same (1978)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: A gaseous fuel cell is described which includes a pair of electrodes formed by open-ended, ion-exchange hollow fibers, each having a layer of metal catalyst deposited on the inner surface and large surface area current collectors such as braided metal mesh in contact with the metal catalyst layer. A fuel cell results when the electrodes are immersed in electrolytes and electrically connected. As hydrogen and oxygen flow through the bore of the fibers, oxidation and reduction reactions develop an electrical potential. Since the hollow fiber configuration provides large electrode area per unit volume and intimate contact between fuel and oxidizer at the interface, and due to the low internal resistance of the electrolyte, high power densities can be obtained.
    Keywords: ENERGY PRODUCTION AND CONVERSION
    Format: application/pdf
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  • 2
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    Coronal changes associated with a disappearing filament (1975)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: Skylab/ATM observations of a disappearing filament near the center of the solar disk are described using XUV and H-alpha spectroheliograms, X-ray filterheliograms, and photospheric magnetograms. The temperature of the coronal plasma as the filament disappeared is estimated to have been in excess of 6 million K, and it is noted that the time history of the soft X-ray and microwave fluxes displayed the gradual-rise-and-fall (GRF) signature, suggesting that the present event may have properties that are characteristic of a wide class of long-duration X-ray and radio events. A comparison with other spatially resolved long-duration X-ray events indicates that all such long-lived bursts involve transients in the outer corona and that some two-thirds of them involve either the eruption or the major activation of a prominence. It is also found that long-lived events are characterized by the appearance of new emission loops in the lower corona during the declining phase of the X-ray emission and that these loops sometimes disappear after the X-ray events and sometimes remain indefinitely.
    Keywords: SOLAR PHYSICS
    Type: Solar Physics; 45; Dec. 197
    Format: text
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  • 3
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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
    Publication Date: 2019-07-13
    Description: 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.
    Keywords: ENERGY PRODUCTION AND CONVERSION
    Type: NASA-CR-157072 , ERDA/JPL-954356-77/4 , HONEYWELL-QR-7
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  • 4
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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
    Publication Date: 2019-07-13
    Description: 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.
    Keywords: ENERGY PRODUCTION AND CONVERSION
    Type: NASA-CR-155613 , ERDA/JPL-954356-77/3 , AR-2
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  • 5
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    Efficiency and cost advantages of an advanced-technology nuclear electrolytic hydrogen-energy production facility (1977)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: 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.
    Keywords: ENERGY PRODUCTION AND CONVERSION
    Type: Symposium on Synthetic fuels processing: Comparative economics; Apr 04, 1976 - Apr 09, 1976; New York, NY
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  • 6
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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 (1976)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: The technical and economic feasibility of producing solar cell quality sheet silicon by dip-coating one surface of carbonized ceramic substrates with a thin layer of large grain polycrystalline silicon was investigated. The dip-coating methods studied were directed toward a minimum cost process with the ultimate objective of producing solar cells with a conversion efficiency of 10% or greater. The technique shows excellent promise for low cost, labor-saving, scale-up potentialities and would provide an end product of sheet silicon with a rigid and strong supportive backing. An experimental dip-coating facility was designed and constructed, several substrates were successfully dip-coated with areas as large as 25 sq cm and thicknesses of 12 micron to 250 micron. There appears to be no serious limitation on the area of a substrate that could be coated. Of the various substrate materials dip-coated, mullite appears to best satisfy the requirement of the program. An inexpensive process was developed for producing mullite in the desired geometry.
    Keywords: ENERGY PRODUCTION AND CONVERSION
    Type: NASA-CR-149242 , ERDA/JPL-954356-76/2 , AR-1
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  • 7
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    Intelsat battery and power system design (1977)
    In:  CASI
    Details
    Publication Date: 2006-06-14
    Description: The orbit data for the Intelsat 4 spacecraft is described. The performance and characteristics of the battery used for this spacecraft are discussed. Graphs are presented which relate battery voltage to various eclipse seasons.
    Keywords: ENERGY PRODUCTION AND CONVERSION
    Type: NASA. Goddard Space Flight Center The 1977 Goddard Space Flight Center Battery Workshop; p 89-107
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  • 8
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    Nimbus and Landsat (1977)
    In:  CASI
    Details
    Publication Date: 2006-06-14
    Description: The operation and systems design of a nickel cadmium battery system used on the Nimbus and LANDSAT satellites are discussed. Emphasis is placed on the charging-discharging operation of the battery system.
    Keywords: ENERGY PRODUCTION AND CONVERSION
    Type: The 1977 Goddard Space Flight Center Battery Workshop; p 25-42
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  • 9
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    Enhancement of solar heavy nuclei at high energies in the 4 July 1974 event (1977)
    In:  Other Sources
    Details
    Publication Date: 2011-08-17
    Description: Relative abundances of energetic nuclei in the July 4, 1974, solar event are presented. The results show a marked enhancement of abundances that systematically increase with nuclear charge numbers in the range of the observation (Z between 6 and 26) for energies above 15 MeV/nucl. While such enhancements are commonly seen below 10 MeV/nucl, most observations at higher energies are found to be consistent with solar-system abundances. The energy spectrum of oxygen is observed to be significantly steeper than most other solar events studied in this energy region. It is proposed that these observations are characteristic of particle populations at energies of the order of 1 MeV/nucl and that the anomalous features observed may be the result of the high-energy extension of such a population that is commonly masked by other processes or populations that might occur in larger solar events.
    Keywords: SOLAR PHYSICS
    Type: Solar Physics; 55; Dec. 197
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  • 10
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    The reconnection of magnetic field lines in the solar corona (1975)
    In:  Other Sources
    Details
    Publication Date: 2011-08-16
    Description: Skylab XUV coronal spectroheliograms and photospheric magnetograms are compared. This comparison shows that, as new bipolar magnetic fields emerge through the solar surface into the corona, the new coronal fields interact with the old ones in a manner that suggests the reconnection of the field lines.
    Keywords: SOLAR PHYSICS
    Type: Astrophysical Journal; 196; Mar. 15
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