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  • ADMINISTRATION AND MANAGEMENT  (2)
  • ISM: dust  (2)
  • Astrophysics  (1)
  • 1
    Electronic Resource
    Electronic Resource
    The Distributed CO in Comet Halley (1999)
    Springer
    Space science reviews 90 (1999), S. 69-74 
    Details
    ISSN: 1572-9672
    Keywords: ISM: dust ; Comets: general ; Comets: Halley
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Examination of the spatial distribution of CO intensity of Comet Halley indicates that a large fraction of CO originates from the refractory organic component in the coma, rather than directly from the volatiles in the nucleus. Based on the fluffy aggregate interstellar dust comet model, we have estimated the upper limits of the total amount of CO provided by coma dust. The implications from the comparison of the predicted results with the observed value have been discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1005277410127
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    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    Morphological Structure and Chemical Composition of Cometary Nuclei and Dust (1999)
    Springer
    Space science reviews 90 (1999), S. 149-161 
    Details
    ISSN: 1572-9672
    Keywords: ISM: dust ; ISM: molecules ; ISM: abundances ; Comets: general ; Comets: individual: Halley, Borrelly, Hale-Bopp ; Stars: individual: β Pictoris ; Stars: circumstellar matter ; Stars: planetary systems
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The chemical composition of comet nuclei derived from current data on interstellar dust ingredients and comet dust and coma molecules are shown to be substantially consistent with each other in both refractory and volatile components. When limited by relative cosmic abundances the water in comet nuclei is constrained to be close to 30% by mass and the refractory to volatile ratio is close to 1:1. The morphological structure of comet nuclei, as deduced from comet dust infrared continuum and spectral emission properties, is described by a fluffy (porous) aggregate of tenth micron silicate core-organic refractory mantle particle on which outer mantles of predominantly H2O ices contain embedded carbonaceous and polycyclic aromatic hydrocarbon (PAH) type particles of size in the of 1 - 10nm range.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1005298014670
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    Paper (German National Licenses)
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  • 3
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    Organic Chemistry in Interstellar Ices: Connection to the Comet Halley Results (1997)
    In:  CASI
    Details
    Publication Date: 2004-12-03
    Description: Mass spectroscopic measurements on the gas and dust in the coma of Comet Halley revealed the presence of considerable amounts of organic species. Greenberg (1973) proposed that prior to the formation of the comet UV processing of the ice mantles on grains in dense clouds could lead to the formation of complex organic molecules. Theoretical predictions of the internal UV field in dense clouds as well as the discovery in interstellar ices of species like OCS and OCN- which have been formed in simulation experiments by photoprocessing of interstellar ice analogues point to the importance of such processing. We undertook a laboratory simulation study of the formation of organic molecules in interstellar ices and their possible relevance to the Comet Halley results.
    Keywords: Astrophysics
    Type: Analysis of Returned Comet Nucleus Samples; 217-224; NASA/CP-1997-10152
    Format: text
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    NASA TECHNICAL REPORTS
  • 4
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    Technology programs and related policies - Impacts on communications satellite business ventures (1985)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: The DOMSAT II stochastic communication satellite business venture financial planning simulation model is described. The specification of business scenarios and the results of several analyses are presented. In particular, the impacts of NASA on-orbit propulsion and power technology programs are described. The effects of insurance rates and self-insurance and of the use of the Space Shuttle and Ariane transportation systems on a typical fixed satellite service business venture are discussed.
    Keywords: ADMINISTRATION AND MANAGEMENT
    Type: IAF PAPER 85-433
    Format: text
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    NASA TECHNICAL REPORTS
  • 5
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    Evaluating the benefits of government funded R & D aimed at the private sector (1977)
    In:  Other Sources
    Details
    Publication Date: 2019-07-27
    Description: Federal funding of technological research and development is discussed with regard to the procedures for an economic analysis with the goals of (1) determining when the public sector should invest in a research and development program, (2) evaluating the likelihood of private sector participation in terms of public sector participation, and (3) considering the major factors in the formulation of a research and development program in terms of defining initiatives. Public sector investments are evaluated, noting procedures for determining whether benefits exceed costs. The role of the public sector research and development planning is described, considering the procedure for private sector implementation decisions and a methodology for evaluating the possibility of private sector commercialization. The economic value of the public sector research and development program is presented with attention given to a specific case of NASA-sponsored research and development aimed toward the commercialization of new public communications services.
    Keywords: ADMINISTRATION AND MANAGEMENT
    Type: IAF PAPER A-77-62
    Format: text
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    NASA TECHNICAL REPORTS
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