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  • Other Sources  (34,989)
  • LUNAR AND PLANETARY EXPLORATION  (14,409)
  • EARTH RESOURCES AND REMOTE SENSING  (10,347)
  • STRUCTURAL MECHANICS  (10,233)
  • Inorganic Chemistry
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  • 1
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    NASA computer program aids American designers (1972)
    In:  CASI
    Details
    Publication Date: 2019-08-27
    Description: The application of the NASTRAN program to solve civilian structural engineering problems is reported. Results and predicted results of the program's use are included.
    Keywords: STRUCTURAL MECHANICS
    Type: NASA-NEWS-RELEASE-72-40
    Format: application/pdf
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  • 2
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    Snow cover in the Siberian forest-steppe (1985)
    In:  CASI
    Details
    Publication Date: 2019-08-28
    Description: A study is made of the snow cover on an experimental agricultural station in Mariinsk in the winter of 1945 to 1946. Conditions of snow cover formation, and types and indicators of snow cover are discussed. Snow cover structure and conditions and nature of thawing are described.
    Keywords: EARTH RESOURCES AND REMOTE SENSING
    Type: NASA-TM-77914 , NAS 1.15:77914
    Format: application/pdf
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  • 3
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    Direct detection of C4H2 photochemical products - Possible routes to complex hydrocarbons in planetary atmospheres (1992)
    In:  Other Sources
    Details
    Publication Date: 2019-08-28
    Description: The photochemistry of diacetylene (C4H2), the largest hydrocarbon to be unambiguously identified in planetary atmospheres, is of considerable importance to understanding the mechanisms by which complex molecules are formed in the solar system. In this work, the primary products of C4H2's ultraviolet photochemistry were determined in a two-laser pump-probe scheme in which the products of C4H2 photoexcitation are detected by vacuum ultraviolet photoionization in a time-of-flight mass spectrometer. Three larger hydrocarbon primary products were observed with good yield in the C4H2 + C4H2 reaction: C6H2, C8H2, and C8H3. Neither C6H2 or C8H3 is anticipated by current photochemical models of the atmospheres of Titan, Uranus, Neptune, Pluto, and Triton. The free hydrogen atoms that are released during the formation of the C8H3 and C8H2 products also may partially offset the role of C4H2 in catalyzing the recombination of free hydrogen atoms in the planetary atmospheres.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Science (ISSN 0036-8075); 258; 5088; p. 1630-1633.
    Format: text
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  • 4
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    Micrometeoroid/space debris effects on materials (1993)
    In:  CASI
    Details
    Publication Date: 2013-08-31
    Description: The Long Duration Exposure Facility (LDEF) micrometeoroid/space debris impact data has been reduced in terms that are convenient for evaluating the overall quantitative effect on material properties. Impact crater flux has been evaluated as a function of angle from velocity vector and as a function of crater size. This data is combined with spall data from flight and ground testing to calculate effective solar absorption and emittance values versus time. Results indicate that the surface damage from micrometeoroid/space debris does not significantly affect the overall surface optical thermal physical properties. Of course the local damage around impact craters radically alter optical properties. Damage to composites and solar cells on an overall basis was minimal.
    Keywords: STRUCTURAL MECHANICS
    Type: LDEF Materials Results for Spacecraft Applications; p 259-279
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  • 5
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    Interaction of the plasma tail of comet Bradfield 1979L on 1980 February 6 with a possibly flare-generated solar-wind disturbance (1983)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: Solar-wind plasma data from the ISEE-3 and Helios 2 spacecraft were examined in order to explain a uniquely rapid 10 deg turning of the plasma tail of comet Bradfield 1979l on 1980 February 6. An earlier study conducted before the availability of in situ solar-wind data (Brandt et al., 1980) suggested that the tail position angle change occurred in response to a solar-wind velocity shear across the polar component changed by approximately 50 km/s. The present contribution confirms this result and further suggests that the comet-tail activity was caused by non-corotating, disturbed plasma flows probably associated with an Importance 1B solar flare.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: NASA-TM-85617 , NAS 1.15:85617 , DE83-011332 , LA-UR-83-1023 , CONF-821159-6 , Solar Wind 5 proceedings
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  • 6
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    Ions of Jovian origin observed by Voyager 1 and 2 in interplanetary space (1980)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: Burst-like and long-lived ion fluxes (E greater than 30 keV) of Jovian origin have been observed in interplanetary space by the LECP instrument on the Voyager 1 and 2 spacecraft. Burst (few minute duration) events are observed at distances greater than 0.6 AU from Jupiter. These events are highly anisotropic and possess steep energy spectra, while long-lived (greater than 8 hour duration) events have relatively steady fluxes at low energies, strong anisotropies that decay with time, and a variable high energy component. Both types of events usually display simultaneous onsets and sharp cutoffs for all energies, an excess of atomic number Z not less than 6 particles compared to solar and interplanetary events, and particle flow directions pointed away from Jupiter along the local interplanetary magnetic field. The origin for the long-lived events appears to be inside the bow shock of the planet.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Geophysical Research Letters; 7; June 198
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  • 7
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    Energetic ions upstream of Jupiter's bow shock (1985)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: In an analysis of the Jovian ion events, Baker et al. (1984) have found that there appears to be a spectral hardening as the interplanetary magnetic field (IMF) changed orientation from the postnoon to a prenoon connection point. It was also observed that ion events were accompanied by long-period (approximately 10 min) waves whose presence was weakly related to a decrease in the ion anisotropy. The present investigation examines in substantial detail the development of the ion energy spectrum over the full range (approximately 30 keV to approximately 4 MeV). The results of the investigation show that the energy spectra are dominated by heavy ions (presumed to be oxygen and sulfur) at higher (approximately equal to or greater than 300 keV) energies.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Journal of Geophysical Research (ISSN 0148-0227); 90; 3947-396
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  • 8
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    Combined hyperspatial and hyperspectral imaging spectrometer concept (1995)
    In:  CASI
    Details
    Publication Date: 2013-08-31
    Description: There is a user need for increasing spatial and spectral resolution in Earth Observation (EO) optical instrumentation. Higher spectral resolution will be achieved by the introduction of spaceborne imaging spectrometers. Higher spatial resolutions of 1 - 3m will be achieved also, but at the expense of sensor redesign, higher communications bandwidth, high data processing volumes, and therefore, at the risk of time delays due to large volume data-handling bottlenecks. This paper discusses a design concept whereby the hyperspectral properties of a spaceborne imaging spectrometer can be used to increase the image spatial resolution, without such adverse cost impact.
    Keywords: EARTH RESOURCES AND REMOTE SENSING
    Type: JPL, Summaries of the Fifth Annual JPL Airborne Earth Science Workshop. Volume 1: AVIRIS Workshop; p 27-30
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  • 9
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    Size effect in composite materials and structures: Basic concepts and design considerations (1994)
    In:  Other Sources
    Details
    Publication Date: 2013-08-29
    Description: Composite materials display strength characteristics that are similar to those of brittle ceramics, whose strengths are known to decrease with increasing volume for a uniform state of stress (size effect) and also are dependent on stress distribution. These similarities raise the question of whether there is also a size effect in composite materials and structures. There is significant, but inconclusive experimental evidence for the existence of a size effect in composites. Macroscopic and micromechanical statistical models have been developed which predict a size effect and are in general agreement with experimental data. The existence of a significant size effect in composites would be of great importance. For example, it would mean that use of standard test coupons to establish design allowables for large structures could be very nonconservative. Further, it would be necessary to analyze the strength of large composite structures using statistical methods, as is done for ceramics.
    Keywords: STRUCTURAL MECHANICS
    Type: NASA. Langley Research Center, Workshop on Scaling Effects in Composite Materials and Structures; p 197-217
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  • 10
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    Design criteria and concepts for fibrous composite structures Final report (1967)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Computerized design and structural analysis of fibrous composite structures
    Keywords: STRUCTURAL MECHANICS
    Type: NASA-CR-91728
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