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  • QUALITY ASSURANCE AND RELIABILITY  (3)
  • GEOPHYSICS  (2)
  • Humans
  • 1975-1979  (5)
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Year
  • 1
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    Convection pattern and stress system under the African plate (1977)
    In:  Other Sources
    Details
    Publication Date: 2011-08-17
    Description: Studies on tectonic forces from satellite-derived gravity data have revealed a subcrustal stress system which provides a unifying mechanism for uplift, depression, rifting, plate motion and ore formation in Africa. The subcrustal stresses are due to mantle convection. Seismicity, volcanicity and kimberlite magmatism in Africa and the development of the African tectonic and magnetic features are explained in terms of this single stress system. The tensional stress fields in the crust exerted by the upwelling mantle flows are shown to be regions of structural kinship characterized by major concentration of mineral deposits. It is probable that the space techniques are capable of detecting and determining the tectonic forces in the crust of Africa.
    Keywords: GEOPHYSICS
    Type: Physics of the Earth and Planetary Interiors; 15; 1, Se; Sept
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Mantle convection pattern and subcrustal stress field under Asia (1978)
    In:  Other Sources
    Details
    Publication Date: 2011-08-17
    Description: Satellite tracking and surface gravity data are used to model the subcrustal stress fields in the terrestrial mantle beneath Asia; the results permit interpretation of the tectonic and seismic systems in China. The east and west China blocks, together with five seismic zones, are identified and related to metallogenic domains on the Chinese mainland. In addition, it is shown that the subcrustal stresses beneath China are arranged perpendicularly to the major fault systems and seismic belts. Stress calculations indicate a notable zone of compression in north China, associated with the Shansi Graben, the Linfen Basin Systems and, possibly, the high seismicity of the region.
    Keywords: GEOPHYSICS
    Type: Physics of the Earth and Planetary Interiors; 16; 3, Ap; Apr. 197
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    Evaluation of a composite mobile holographic nondestructive test system (1976)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: A simplified theoretical model for the interpretation of the double-exposure holographic interference fringe loci due to the general three-dimensional displacements was derived for the specific composite mobile holographic nondestructive test system. The model, representing a good approximation to a more tedious theoretical result, predicts that a combination of in-plane and out-of-plane displacements of the surface will produce concentric circular-shaped fringe patterns with locations of their center affected by the displacements. Appropriate experiments were designed and carried out for the test of the validity of the theory. These experiments include the taking of double-exposure holograms of in-plane translations and combined in-plane and out-of-plane translations. The simplified model agreed quite well with the experimental results. Experimentally observed effects due to the curvature of the test plate and the variations of the angles of incidence of the laser light suggest that in order for the simplified model to be able to predict the test results more accurately, incidence and reflection of the laser light should be chosen as nearly perpendicular to the surface of the tested object as possible.
    Keywords: QUALITY ASSURANCE AND RELIABILITY
    Type: NASA-CR-144349 , BER-204-74
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 4
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    Practical quantitative fringe interpretation in a composite mobile holographic nondestructive test system (1977)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: A simplified theoretical model for the interpretation of the double-exposure holographic interference fringe loci due to the general three-dimensional displacements has been derived for the specific composite mobile holographic nondestructive test system. The model, representing a good approximation to a more tedious theoretical result, predicts that a combination of in-plane and out-of-plane displacements of the surface will produce concentric circular-shaped fringe patterns.
    Keywords: QUALITY ASSURANCE AND RELIABILITY
    Type: Seminar on Practical applications of low power lasers; Aug 26, 1976 - Aug 27, 1976; San Diego, CA
    Format: text
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    NASA TECHNICAL REPORTS
  • 5
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    Electric current heating calibration of a laser holographic nondestructive test system (1975)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: Holographic NDT was used to measure small surface displacements controlled by electric heating by detecting the difference of the interference fringe patterns as viewed through the hologram on a real time basis. A perforated aluminum test plate, with the holes used to position thin metal foils, was used in the experiment. One of the foils was connected to an electric power source and small displacements of the foil were caused and controlled by Ohmic heating. An He-Ne laser was used to perform the holography.
    Keywords: QUALITY ASSURANCE AND RELIABILITY
    Type: Electricity: An expanding technology; Apr 06, 1975 - Apr 09, 1975; Charlotte, NC
    Format: text
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    NASA TECHNICAL REPORTS
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