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  • Other Sources  (4)
  • Geomagnetics  (2)
  • COMPOSITE MATERIALS  (1)
  • INSTRUMENTATION AND PHOTOGRAPHY  (1)
  • 1
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    Geomagnetism (1987)
    Academic Press
    In:  London, Academic Press, vol. 558, no. XVI:, pp. 1-14, (ISBN 3-9808493-1-7)
    Details
    Publication Date: 1987
    Keywords: Textbook of geophysics ; Geomagnetics ; Applied geophysics
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    BIBLIOGRAPHY SEISMOLOGY
  • 2
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    Geomagnetism, Vol. 4 (1991)
    Academic
    In:  San Diego, Calif., Academic, vol. 558, no. XVI:, pp. 1-14, (ISBN 3-9808493-1-7)
    Details
    Publication Date: 1991
    Keywords: Geomagnetics ; Textbook of geophysics
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    BIBLIOGRAPHY SEISMOLOGY
  • 3
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    Biocontamination and particulate detection system (1979)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: A method for determining the characteristics and amount of microscopic contaminants lodged on a photographed surface is disclosed. An image enhanced full color photographic negative and print are taken of the contaminated surface. Three black and white prints are developed subsequently from red, green and blue separation filter overlays of the color negative. Both the color and three monochromatic prints are then scanned to extract in digital form a profile of any contaminant possibly existing on the surface. The resulting profiles are electronically analyzed and compared with data already stored relating to known contaminants.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 4
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    Tensile behavior of glass/ceramic composite materials at elevated temperatures (1987)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: This paper describes the tensile behavior of high-temperature composite materials containing continuous Nicalon ceramic fiber reinforcement and glass and glass/ceramic matrices. The longitudinal properties of these materials can approach theoretical expectations for brittle matrix composites, failing at a strength and ultimate strain level consistent with those of the fibers. The brittle, high-modulus matrices result in a nonlinear stress-strain curve due to the onset of stable matrix cracking at 10 to 30 percent of the fiber strain to failure, and at strains below this range in off-axis plies. Current fibers and matrices can provide attractive properties well above 1000 C, but composites experience embrittlement in oxidizing atmospheres at 800 to 1000 C due to oxidation of a carbon interface reaction layer.The oxidation effect greatly increases the interface bond strength, causing composite embrittlement.
    Keywords: COMPOSITE MATERIALS
    Type: ASME PAPER 87-GT-75 , ASME, Transactions, Journal of Engineering for Gas Turbines and Power (ISSN 0022-0825); 109; 267-273
    Format: text
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    NASA TECHNICAL REPORTS
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