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  • 1980-1984  (5)
  • 1981  (5)
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  • 1980-1984  (5)
Year
  • 1
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    Carbohydrate modifications of the high mobility group proteins. (1981)
    National Academy of Sciences
    Details
    Publication Date: 1981-11-01
    Print ISSN: 0027-8424
    Electronic ISSN: 1091-6490
    Topics: Biology , Medicine , Natural Sciences in General
    Published by National Academy of Sciences
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    PAPER CURRENT
  • 2
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    Eigenvalues of the Boltzmann collision operator for binary gases: Mass dependence (1981)
    Elsevier
    Details
    Publication Date: 1981-04-01
    Print ISSN: 0301-0104
    Electronic ISSN: 1873-4421
    Topics: Chemistry and Pharmacology , Physics
    Published by Elsevier
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    PAPER CURRENT
  • 3
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    Time-resolved spectroscopy of the Mercury 6 3P1 state (1981)
    In:  Other Sources
    Details
    Publication Date: 2011-08-18
    Description: The time-resolved fluorescence was observed from the Hg 6 3P1 state under the influence of the earth's magnetic field and with applied fields of up to 14 G. Modulation of the fluorescence decay signal was observed as a function of both time and space and can be interpreted in terms of a classical precession of the excited atom about the magnetic field or as quantum beats resulting from interference between coherently populated Zeeman sublevels. This modulation was studied for each of the five resolvable components of the hyperfine structure separately. The fluorescence from the even isotopes was determined to be almost completely modulated while the fluorescence from the odd isotopes was only partially modulated. The frequency of modulation of the fluorescence from the mercury-202 isotope was observed as a function of the applied magnetic field and a value for the Lande factor of 1.46 + or - 0.03 was obtained. This is within experimental error of the accepted value of 1.486. In addition, the frequency of modulation as a function of applied magnetic field was determined for each of the three resolvable components with more than one contributing isotopic hyperfine line. An investigation of the effect of radiation trapping on the degree modulation was also made.
    Keywords: INORGANIC AND PHYSICAL CHEMISTRY
    Type: Journal of Physical Chemistry; 85; Sept. 17
    Format: text
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    NASA TECHNICAL REPORTS
  • 4
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    Two-dimensiosnal electron beam charging model for polymer films (1981)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: A two dimensional model was developed to describe the charging of thin polymer films exposed to a uniform mon-energetic electron beam. The study was motivated by observed anomalous behavior of geosynchronous satellites which was attributed to electrical discharges associated with the differential charging of satellite surfaces of magnetospheric electrons. Electric fields both internal and external to the irradiated specimen were calculated at steady state in order to identify regions of high electrical stress. Particular emphasis was placed on evaluating the charging characteristics near the material's edge. The model was used to identify and quantify the effects of some of the experimental parameters notably: beam energy; beam angle of incidence; beam current density; material thickness; and material width. Simulations of the following situations were also conducted: positive or negative precharging over part of the surface; a central gap in the material; and a discontinuity in the material's thickness.
    Keywords: NONMETALLIC MATERIALS
    Type: NASA-CR-164758
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 5
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    Two-dimensional electron beam charging model for polymer films (1981)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: A two-dimensional model is developed to describe the charging of strips of thin polymer films above a grounded substrate exposed to a uniform mono-energetic electron beam. The study is motivated by the observed anomalous behavior of geosynchronous satellites, which has been attributed to differential charging of the satellite surfaces exposed to magnetospheric electrons. Surface and bulk electric fields are calcuated at steady state in order to identify regions of high electrical stress, with emphasis on behavior near the material's edge. The model is used to study the effects of some of the experimental parameters, notably beam energy, beam angle of incidence, beam current density, material thickness and material width. Also examined are the consequences of a central gap in the material and a discontinuity in the material thickness.
    Keywords: NONMETALLIC MATERIALS
    Format: text
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    NASA TECHNICAL REPORTS
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