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  • Other Sources  (4,029)
  • LUNAR AND PLANETARY EXPLORATION  (3,213)
  • SPACECRAFT PROPULSION AND POWER  (816)
  • Biochemistry and Biotechnology
  • Life and Medical Sciences
  • 1980-1984  (4,029)
  • 1905-1909
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  • 1
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    Voyages to Saturn (1982)
    In:  CASI
    Details
    Publication Date: 2019-08-28
    Description: The Voyager mission to Saturn is explained in detail. A history of Saturn observations from ancient times to the present is given. The Voyager spacecraft and their instruments are described. An overview of planetary astronomy is presented. The text is supplemented by numerous black and white and color photographs. The Saturn satellites are discussed in detail, and preliminary pictorial maps of the satellites are given.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: NASA-SP-451 , NAS 1.21:451 , LC-81-600073
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 2
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    Overview of large space systems/propulsion interactions (1982)
    In:  Other Sources
    Details
    Publication Date: 2019-08-28
    Description: Large space structure characteristics, antenna controller design, the attitude control system, mission grouping, propulsion system/large space structure interactions, structural mass impact for start transient effects, box truss multiple thrust point effects, and large space structure/propulsion issues are illustrated.
    Keywords: SPACECRAFT PROPULSION AND POWER
    Type: NASA. Lewis Research Center Large Space Systems(Propulsion Interactions; p 1-6
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    Automation technology for aerospace power management (1982)
    In:  Other Sources
    Details
    Publication Date: 2019-08-28
    Description: The growing size and complexity of spacecraft power systems coupled with limited space/ground communications necessitate increasingly automated onboard control systems. Research in computer science, particularly artificial intelligence has developed methods and techniques for constructing man-machine systems with problem-solving expertise in limited domains which may contribute to the automation of power systems. Since these systems perform tasks which are typically performed by human experts they have become known as Expert Systems. A review of the current state of the art in expert systems technology is presented, and potential applications in power systems management are considered. It is concluded that expert systems appear to have significant potential for improving the productivity of operations personnel in aerospace applications, and in automating the control of many aerospace systems.
    Keywords: SPACECRAFT PROPULSION AND POWER
    Type: IECEC ''82; Seventeenth Intersociety Energy Conversion Engineering Conference; Aug 08, 1982 - Aug 12, 1982; Los Angeles, CA
    Format: text
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    NASA TECHNICAL REPORTS
  • 4
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    The Viking seismometry (1981)
    In:  CASI
    Details
    Publication Date: 2019-08-28
    Description: Efforts were made to determine the seismicity of Mars as well as define its internal structure by detecting vibrations generated by marsquakes and meteoroid impacts. The lack of marsquakes recognized in the Viking data made it impossible to make any direct inferences about the interior of Mars and only allowed the setting of upper bounds on the seismic activity of the planet. After obtaining more than 2100 hours worth of data during the quite periods at rates of one sample per second or higher, the Viking 2 seismometer was turned off as a consequence of a landing system failure. During the periods when adequate data were obtained, one event of possible seismic or meteoroid impact origin was recognized; however, there is a significant probability that this event was generated by a wind gust.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: NASA-CR-3408
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 5
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    Meteorite analysis assists search for life (1980)
    In:  CASI
    Details
    Publication Date: 2019-08-28
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: NASA-NEWS-RELEASE-80-21 , P80-10024
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 6
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    Electric propulsion comes of age (1980)
    In:  Other Sources
    Details
    Publication Date: 2019-08-28
    Description: The article examines several aspects of electric propulsion. It is shown that because the process and rate of energy transfer in electric systems are quite different from those of chemical propulsion systems, performance and orbit mechanics are intimately related. Attention is given to the several discrete subelements of an electric primary propulsion system, showing that while they have straightforward operating principles, they present challenges in implementation as working hardware. Finally, discussion covers applications which include a range of interplanetary and near-earth missions.
    Keywords: SPACECRAFT PROPULSION AND POWER
    Type: vol. 33; May 1980
    Format: text
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  • 7
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    The International Halley Watch (1980)
    In:  CASI
    Details
    Publication Date: 2019-08-28
    Description: In preparation for the 1985 to 1986 apparition of Halley's Comet, the International Halley Watch (IHW) has initiated a comprehensive program to simulate, encourage, and coordinate scientific observation of the apparition. The observing groups with which the IHW plans to interact are discussed and the ground based observing nets are described in detail. An outline of the history of observations of Halley's Comet and a synopsis of comet properties and physics are included.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: NASA-TM-82181
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 8
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    NASA technology program overview (1980)
    In:  CASI
    Details
    Publication Date: 2019-08-28
    Description: Various aspects of space power and electric propulsion are illustrated. The following topics are outlined: Photovoltaic power conversion; power management and distribution; chemical energy conversion and storage; thermal to electric conversion; advanced energetics; and synchronous energy technology.
    Keywords: SPACECRAFT PROPULSION AND POWER
    Type: NASA. Lewis Space Flight Center Synchronous Energy Technol.; p 9-13
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 9
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    Crater numbers and geological histories of Iapetus, Enceladus, Tethys and Hyperion (1983)
    In:  Other Sources
    Details
    Publication Date: 2019-08-28
    Description: The surfaces of the Saturn satellites Tethys, Iapetus and Encedalus display surfaces which indicate active geological processes and therefore suggest a degree of internal evolution. By contrast, the Saturn satellite Hyperion and the coorbitals 1980S1 and 1980S3 show no trace of geological activity and may be fragments of once-larger bodies. Activity on Iapetus appears to have been confined to the dark terrain, and offers no clue as to its timing and extent. The widest terrain type and crater number variations are those of Encedalus, which indicate the most prolonged period of geological activity of any of the satellites studied.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Nature; 301; Feb. 24
    Format: text
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    NASA TECHNICAL REPORTS
  • 10
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    Thermal inertia mapping of Mars from 60 deg S to 60 deg N (1981)
    In:  Other Sources
    Details
    Publication Date: 2019-08-28
    Description: The considered region comprises 81% of the surface of Mars. Thermal inertia I is a composite surface property, which is equal to the square root of the product of three factors, including the thermal conductivity, the density, and the specific heat. I is the sole thermal parameter which governs the temperature variation of a periodically heated homogeneous surface, and, as such, is the prime intermediary between remote temperature observations and their geologic interpretation. The values for the thermal inertia found imply particulate surface materials. The variation in Martian surface thermal conductivity is about two orders of magnitude. Three large regions of low-inertia material are defined. Low-inertia material always possesses high albedo. There is a general tendency for higher-thermal-inertia surfaces to be darker but exceptions occur which may be related to a thin mantling of light dust or bonding of light material.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Icarus; 45; Feb. 198
    Format: text
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