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  • COMPOSITE MATERIALS  (3)
  • General Chemistry  (3)
  • GEOPHYSICS  (2)
  • 1980-1984  (8)
  • 1
    Electronic Resource
    Electronic Resource
    Sukzessive Cyclisierungen eines Arachidonsäurehydroperoxids (1982)
    Weinheim : Wiley-Blackwell
    Zeitschrift für die chemische Industrie 94 (1982), S. 220-221 
    Details
    ISSN: 0044-8249
    Keywords: Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: No Abstract.Das vollständige Manuskript dieser Zuschrift erscheint in: Angew. Chem. Suppl. 1982, 513-522
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/ange.19820940330
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    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    Serial Cyclizations of An Arachidonic Acid Hydroperoxide (1982)
    Weinheim : Wiley-Blackwell
    Angewandte Chemie International Edition in English 21 (1982), S. 217-218 
    Details
    ISSN: 0570-0833
    Keywords: Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: No Abstract.The complete manuscript of this communication appears in: Angew. Chem. Suppl. 1982, 513. DOI:10.1002/anie.198205130
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/anie.198202171
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Serial Cyclization of an Arachidonic Acid HydroperoxideWe gratefully acknowledge financial support from the National Science Foundation and the National Institutes of Health. Helpful discussions with Dr. E. D. Mihelich of Procter and Gamble are also acknowledged. (1982)
    Weinheim : Wiley-Blackwell
    Angewandte Chemie International Edition in English 21 (1982), S. 513-522 
    Details
    ISSN: 0570-0833
    Keywords: Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 1 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/anie.198205130
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    Paper (German National Licenses)
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  • 4
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    An analytic formulation for heating source memory in the thermospheric composition (1981)
    In:  Other Sources
    Details
    Publication Date: 2011-08-18
    Description: Numerical calculations from a spectral circulation model are utilized to construct an analytic Green's function formulation describing the meridional, time-dependent thermospheric composition and temperature response during magnetic storms. The purpose is to develop a formulation that embodies source memory while being sufficiently simple to serve as a heuristic guide for empirical modeling. By passing from the discrete Fourier series representation, utilized for the numerical circulation model, to a continuous Fourier integral representation, explicit waves are obtained for the thermospheric response times. The response times are altitude and species dependent and can exceed two days below 200 km. Thus, for certain storm scenarios, pronounced source memory signatures for the composition and temperature are predicted. Response times obtained from the formulation are shown to give a response consistent with previously published neutral composition data from AE-C for the February 1974 storm when an ap dependent heat source is employed.
    Keywords: GEOPHYSICS
    Type: Journal of Geophysical Research; 86; May 1
    Format: text
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    NASA TECHNICAL REPORTS
  • 5
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    Semiempirical modeling of thermospheric magnetic storms (1981)
    In:  Other Sources
    Details
    Publication Date: 2011-08-18
    Description: An improved formulation for empirical modeling of magnetic storm effects in neutral thermospheric composition and temperature is utilized in a study of two disturbed periods. The formulation, which incorporates the prior history of the heat input rather than a single phase delay, is based on a Fourier integral representation of an existing theoretical model. This results in an improved representation of the detailed time variations and a better carry-over of model parameters from one storm to the other and provides a basis for theoretical interpretation.
    Keywords: GEOPHYSICS
    Type: Journal of Geophysical Research; 86; May 1
    Format: text
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  • 6
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    Environmental effects on defect growth in composite materials (1981)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: Data for evaluating the effects of moisture and temperature on the integrity of fiber composite components was gathered. In particular, the static and cyclic performance of three composite laminates containing flaws was investigated at room temperature and at 422 K (300 F) in wet and dry conditions.
    Keywords: COMPOSITE MATERIALS
    Type: NASA-CR-165213 , NAS 1.26:165213
    Format: application/pdf
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  • 7
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    Environmental effects on composite fracture behavior (1981)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: An experimental program was carried out to investigate the effects of temperature and moisture on the damage development and fracture response of graphite/epoxy composites. Fracture response data were obtained for 20-ply laminates of different layup patterns for both room temperature and immediately after the application of a temperature transient causing the specimen to attain 150 C. It is found that elevated temperature degrades the notched strength of some laminates while not degrading others. The unnotched strength of all laminates tested at elevated temperatures was degraded. The effect of preloading on damage growth and moisture absorption, the effect of autoclave pressure during the laminate cure on fracture, and the variation of interlaminar shear properties with layup, moisture exposure, laminate material, and cure pressure are also discussed.
    Keywords: COMPOSITE MATERIALS
    Type: Symposium on Test methods and design allowables for fibrous composites; Oct 02, 1979 - Oct 03, 1979; Dearborn, MI
    Format: text
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  • 8
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    Compression and compression fatigue testing of composite laminates (1982)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: The effects of moisture and temperature on the fatigue and fracture response of composite laminates under compression loads were investigated. The structural laminates studied were an intermediate stiffness graphite-epoxy composite (a typical angle ply laimna liminate had a typical fan blade laminate). Full and half penetration slits and impact delaminations were the defects examined. Results are presented which show the effects of moisture on the fracture and fatigue strength at room temperature, 394 K (250 F), and 422 K (300 F). Static tests results show the effects of defect size and type on the compression-fracture strength under moisture and thermal environments. The cyclic tests results compare the fatigue lives and residual compression strength under compression only and under tension-compression fatigue loading.
    Keywords: COMPOSITE MATERIALS
    Type: NASA-CR-168023 , NAS 1.26:168023 , D180-27619-1
    Format: application/pdf
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