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  • Other Sources  (948)
  • LUNAR AND PLANETARY EXPLORATION  (601)
  • METEOROLOGY AND CLIMATOLOGY  (347)
  • Humans
  • Organic Chemistry
  • Polymer and Materials Science
  • 1980-1984  (948)
  • 1981  (948)
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  • 1980-1984  (948)
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  • 1
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    Calculation of the attenuation and phase displacement per unit of length due to rain composed of ellipsoidal drops (1981)
    In:  CASI
    Details
    Publication Date: 2019-08-28
    Description: All of the phenomena which influence the propagation of radiowaves at frequencies above 10 GHz (attenuation, depolarization, scintillation) can by intensified by parameters directly derived from a solution of individual scatter, naturally in addition to be meteorological elements which characterize the physical medium. The diffusion caused by rainy precipitation was studied using Mie's algorithm for rain composed of spherical drops, and Oguchi's algorithm for rain composed of drops in an ellipsoidal form with axes of rotational symmetry arrange along the vertical line of a generic reference point. Specific phase displacement and attenuation along the principal planes, propagation of radiowaves in generic polarization, and propagation with inclined axes are also considered.
    Keywords: METEOROLOGY AND CLIMATOLOGY
    Type: NASA-TM-76592 , RIF-1B1778
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 2
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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
  • 3
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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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    NASA TECHNICAL REPORTS
  • 4
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    Press conference on Voyager 2 Saturn encounter (1981)
    In:  CASI
    Details
    Publication Date: 2019-08-28
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: P81-10211
    Format: text
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    NASA TECHNICAL REPORTS
  • 5
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    Advances in planetary geology (1981)
    In:  CASI
    Details
    Publication Date: 2019-08-28
    Description: This second issue in a new series intended to serve the planetary geology community with a form for quick and thorough communications includes (1) a catalog of terrestrial craterform structures for northern Europe; (2) abstracts of results of the Planetary Geology Program, and (3) a list of the photographic holdings of regional planetary image facilities.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: NASA-TM-83089
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 6
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    Voyager backgrounder (1981)
    In:  CASI
    Details
    Publication Date: 2019-08-27
    Description: The Voyager spacecraft and experiments are described. The spacecraft description includes the structure and configuration, communications systems, power supplies, computer command subsystems, and the science platform. The experiments discussed are investigations of cosmic rays, low-energy charged particles, magnetic fields, and plasma waves, along with studies in radio astronomy photopolarimetry. The tracking and data acquisition procedures for the missions are presented.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: NASA-NEWS-RELEASE-81-116 , P81-10118
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 7
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    Encounter with Saturn - Voyager 1 imaging science results (1981)
    In:  Other Sources
    Details
    Publication Date: 2019-08-27
    Description: As Voyager 1 flew through the Saturn system it returned photographs revealing many new and surprising characteristics of this complicated community of bodies. Saturn's atmosphere has numerous, low-contrast, discrete cloud features and a pattern of circulation significantly different from that of Jupiter. Titan is shrouded in a haze layer that varies in thickness and appearance. Among the icy satellites there is considerable variety in density, albedo, and surface morphology and substantial evidence for endogenic surface modification. Trends in density and crater characteristics are quite unlike those of the Galilean satellites. Small inner satellites, three of which were discovered in Voyager images, interact gravitationally with one another and with the ring particles in ways not observed elsewhere in the solar system. Saturn's broad A, B, and C rings contain hundreds of 'ringlets', and in the densest portion of the B ring there are numerous nonaxisymmetric features. The narrow F ring has three components which, in at least one instance, are kinked and crisscrossed. Two rings are observed beyond the F ring, and material is seen between the C ring and the planet.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Science; 212; Apr. 10
    Format: text
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    NASA TECHNICAL REPORTS
  • 8
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    Evaluation of photogrammetric flight under icing conditions on March 23, 1978 (1981)
    In:  CASI
    Details
    Publication Date: 2019-08-27
    Description: In a double passage through a route laid out in a stagnation zone of the Bavarian forest, it was found that the stagnation and attendant elevation increases the danger of icing. Conversely, it turned out that formation of precipitation reduces the icing intensity. A comparison of both factors showed: the reduction of ice formation through precipitation equals the increase due to stagnation, or even exceeds it.
    Keywords: METEOROLOGY AND CLIMATOLOGY
    Type: NASA-TM-76617
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 9
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    Measurement of characteristics of lightning at high altitudes (1981)
    In:  CASI
    Details
    Publication Date: 2019-08-27
    Description: New development in aeronautical technology -- the use of composite materials, new electronic components, electric flight controls -- have made aircraft potentially more and more vulnerable to the effects of lightning. In-flight tests were conducted to evaluate the current in a bolt of lightning, to measure voltage surge in the onboard circuitry and in certain pieces of equipment, and to document the relationship lightning bolt current and the voltage surge so as to develop a theoretical model and thuds to become acquainted with the significant
    Keywords: METEOROLOGY AND CLIMATOLOGY
    Type: NASA-TM-76669
    Format: application/pdf
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  • 10
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    NASA Facts: Images of Saturn from Voyager 2 (1981)
    In:  CASI
    Details
    Publication Date: 2019-08-27
    Description: Six color images of Saturn and four of her moons, acquired by Voyager 2, are presented. A brief narrative and explanatory captions, including explanations of the planet's atmosphere and rings, are presented.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: NASA-NF-132/10-81
    Format: application/pdf
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    NASA TECHNICAL REPORTS
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