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  • GEOPHYSICS  (768)
  • Inorganic Chemistry  (637)
  • Cell & Developmental Biology  (625)
  • METEOROLOGY AND CLIMATOLOGY  (496)
  • ENERGY PRODUCTION AND CONVERSION  (385)
  • SPACE SCIENCES
  • 1980-1984  (2.911)
  • 1935-1939
  • 1984  (2.911)
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  • 1980-1984  (2.911)
  • 1935-1939
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  • 1
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    Classification of volcanoes of the Kane Patera Quadrangle of Io: Proportions of lava flows and pyroclastic flows (1984)
    In:  CASI
    Details
    Publikationsdatum: 2009-11-16
    Beschreibung: Voyager 1 images show 14 volcanic centers wholly or partly within the Kane Patera quadrangle of Io, which are divided into four major classes: (1) shield with parallel flows; (2) shield with early radial fan shapd flows; (3) shield with radial fan shaped flows, surfaces of flows textured with longitudinal ridges; and (4) depression surrounded by plateau-forming scarp-bounded, untextured deposits. The interpretation attempted here hinges largely on the ability to distinguish lava flows from pyroclastic flows by remote sensing.
    Schlagwort(e): GEOPHYSICS
    Materialart: NASA, Washington Rept. of Planetary Geol. Program, 1983; p 127-129
    Format: text
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  • 2
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    Interpretation of planetary stress systems: Determination of tectonic over-printing in Northwest Wyoming (1984)
    In:  CASI
    Details
    Publikationsdatum: 2006-04-06
    Beschreibung: Structural and tectonic interpretations of planetary surfaces rely strongly on visual determination of regional structural grain. This grain can be very complex and confusing, and sorting out of discrete trends in time and space is of utmost importance. This study is a test of these techniques applied to a well known area having several discrete structural grains. In the Bighorn Basin region of Wyoming, a largely overlooked N10E structural grain has been verified with detailed structural analysis and indicates a significant change in stress orientation at the end of the Laramide orogeny.
    Schlagwort(e): GEOPHYSICS
    Materialart: NASA. Washington Rept. of Planetary Geology Program, 1983; p 307-309
    Format: text
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  • 3
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    Volcanism in the Valles Marineris (1984)
    In:  CASI
    Details
    Publikationsdatum: 2006-04-06
    Beschreibung: Tectoism in the Valles Marineris appears to have been accompanied by volcanism. The proposed volcanic features, though probably contemporaneous with the gigantic ones in the Tharsis area, are composed of small, mafic and, possibly, somewhat larger felsic flows. The size of these features is similar to that of volcanic flows on the Earth.
    Schlagwort(e): GEOPHYSICS
    Materialart: NASA. Washington Rept. of Planetary Geol. Program, 1983; p 135-137
    Format: text
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  • 4
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    Experiments on water/melt explosions, nature of products, and models of dispersal (1984)
    In:  CASI
    Details
    Publikationsdatum: 2006-04-06
    Beschreibung: Experiments were carried out in a steel pressure device using controlled amounts of water and thermite melt to examine the mechanical energy released on explosive mixing following the initial contact of the two materials. An experimental design was used to allow the direct calculation of the mechanical energy by the dynamic lift of the device as recorded both optically and physically. A large number of experiments were run to accurately determine the optimum mixture of water and melt for the conversion of thermal to mechanical energy. The maximum efficiency observed was about 12% at a water/thermite mass ratio of 0.50. These experiments are the basis for the development of models of hydroexplosions and melt fragmentation. Particles collected from the experimental products are similar in size and shape to pyroclasts produced by much larger hydrovolcanic explosions. Melt rupture at optimum ratios produces very fine particles whereas rupture at high or low water/melt ratios produces large melt fragments. Grain surface textures in the experimental products are also related to the water/melt ratio and the mechanism of explosive mixing. It is thus possible to have qualitative information about the nature of the explosion from the sizes and shapes of the fragments produced.
    Schlagwort(e): GEOPHYSICS
    Materialart: NASA. Washington Rept. of Planetary Geol. Program, 1983; p 144-146
    Format: text
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  • 5
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    High speed, low cost, LEO-thermal-cycling facility (1984)
    In:  CASI
    Details
    Publikationsdatum: 2006-02-14
    Beschreibung: The design and operations of a low cost, high rate thermal cycling facility designed for LEO conditions is described. Thermal cycling facilities were constructed with various design criteria. Some were designed to duplicate as closely as possible the conditions a cell or module would encounter while in orbit about the Earth. A typical facility to perform this type of cycling was a large vacuum system with liquid nitrogen cooled walls. The cells were heated by an AMO spectrum solar simulator, then a shutter was closed allowing the cells to give up their heat to the cold walls. This system was good at duplicating the orbital conditions but was slow and very costly to operate. Other systems used a gas atmosphere and heated the cells with radiant heat and cooled the cells by moving them into close proximity to a cold plate. The systems greatly increased the cycle times. Other systems moved the heating and cooling atmosphere into and out of the test areas and achieved reasonable cycle rates. All these systems, however, are expensive to operate.
    Schlagwort(e): ENERGY PRODUCTION AND CONVERSION
    Materialart: Space Photovoltaic Res. and Technol. 1983; p 223-227
    Format: text
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  • 6
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    Panel fabrication utilizing GaAs solar cells (1984)
    In:  CASI
    Details
    Publikationsdatum: 2006-02-14
    Beschreibung: The development of the GaAs solar cells for space applications is described. The activities in the fabrication of GaAs solar panels are outlined. Panels were fabricated while introducing improved quality control, soldering laydown and testing procedures. These panels include LIPS II, San Marco Satellite, and a low concentration panel for Rockwells' evaluation. The panels and their present status are discussed.
    Schlagwort(e): ENERGY PRODUCTION AND CONVERSION
    Materialart: NASA. Lewis Research Center Space Photovoltaic Res. and Technol. 1983; p 205-209
    Format: text
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  • 7
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    Preflight study of San Marco D/L GaAs solar cell panels (1984)
    In:  CASI
    Details
    Publikationsdatum: 2006-02-14
    Beschreibung: The solar array for the San Marco D/L spacecraft is described and the performance of 4 GaAs solar cell panels are examined. In comparison to the typical Si solar cell panel for San Marco D/L, it is shown that each GaAs solar cell panel provides at least 23 percent more specific power at maximum output and 28 deg C. Also described here, are several measurements that will be made to evaluate the relative performance of Si and GaAs solar cell panels during the San Marco D/L flight.
    Schlagwort(e): ENERGY PRODUCTION AND CONVERSION
    Materialart: NASA. Lewis Research Center Space Photovoltaic Res. and Technol. 1983; p 176-181
    Format: text
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  • 8
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    Development of GaAs/Si and GaAs/Si monolithic structures for future space solar cells (1984)
    In:  CASI
    Details
    Publikationsdatum: 2006-02-14
    Beschreibung: The results of heteroepitaxial growth of GaAs and GaAlAs directly on Si are presented, and applications to new cell structures are suggested. The novel feature is the elimination of a Ge lattice transition region. This feature not only reduces the cost of substrate preparation, but also makes possible the fabrication of high efficiency monolithic cascade structures. All films to be discussed were grown by organometallic chemical vapor deposition at atmospheric pressure. This process yielded reproducible, large-area films of GaAs, grown directly on Si, that are tightly adherent and smooth, and are characterized by a defect density of 5 x 10(6) power/sq cm. Preliminary studies indicate that GaAlAs can also be grown in this way. A number of promising applications are suggested. Certainly these substrates are ideal for low-weight GaAs space solar ells. For very high efficiency, the absence of Ge makes the technology attractive for GaAlAs/Si monolithic cascades, in which the Si substrates would first be provided with a suitable p/n junction. An evaluation of a three bandgap cascade consisting of appropriately designed GaAlAs/GaAs/Si layers is also presented.
    Schlagwort(e): ENERGY PRODUCTION AND CONVERSION
    Materialart: NASA. Lewis Research Center Space Photovoltaic Res. and Technol. 1983; p 128-139
    Format: text
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  • 9
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    Defect studies in one MeV electron irradiated GaAs and in Al/sub x Ga/sub l-x As P-N junction solar cells (1984)
    In:  CASI
    Details
    Publikationsdatum: 2006-02-14
    Beschreibung: Deep level transient spectroscopy reveals that the main electron traps for one-MeV electron irradiated GaAs cells are E9c)-0.31, E(c)-0.90 eV, and the main hole trap is due to the level. Electron trap density was found to vary from 3/tens-trillion ccm for 2/one quadrillion cm 3/3.7 quadrillion cm for 21 sextillion cm electron fluence for electron fluence; a similar result was also obtained for the hole trap density. As for the grown-in defects in the Al(x)Ga(1-x)As p-n junciton cells, only two electron traps with energies of E(c)-0.20 and E(c)-0.34 eV were observed in samples with x = 0.17, and none was found for x 0.05. Auger analysis on the Al(x)Ga(1-x) As window layer of the GaAs solar cell showed a large amount of oxygen and carbon contaminants near the surface of the AlGaAs epilayer. Thermal annealing experiment performed at 250 C for up to 100 min. showed a reduction in the density of both electron traps.
    Schlagwort(e): ENERGY PRODUCTION AND CONVERSION
    Materialart: NASA. Lewis Research Center Space Photovoltaic Res. and Technol. 1983; p 91-101
    Format: text
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  • 10
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    Model of solar cell proton damage (1984)
    In:  CASI
    Details
    Publikationsdatum: 2006-02-14
    Beschreibung: A short circuit current (I sub sc) degradation model for gallium arsenide (GaAs) solar cells irradiated by protons from low energy to 100 MeV was developed. This model was found to be satisfactory in predicting the I sub sc degradation of GaAs cells, but not that of silicon (Si) cells. A modification to the aforementioned model that preserves the optical wavelength dependency in the photogeneration of minority carrier pairs was described herein. Spectral Si and GaAs response and I sub sc for the Si and GaAs solar cells were discussed, and also were presented in graph form. The overall predictability of the modified model was deemed to be satisfactory.
    Schlagwort(e): ENERGY PRODUCTION AND CONVERSION
    Materialart: NASA. Lewis Research Center Space Photovoltaic Res. and Technol. 1983; p 56-62
    Format: text
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