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  • Comets: general  (2)
  • ASTRONAUTICS (GENERAL)  (1)
  • 1
    Digitale Medien
    Digitale Medien
    The Distributed CO in Comet Halley (1999)
    Springer
    Space science reviews 90 (1999), S. 69-74 
    Details
    ISSN: 1572-9672
    Schlagwort(e): ISM: dust ; Comets: general ; Comets: Halley
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: 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.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1023/A:1005277410127
    Standort Signatur Erwartet Verfügbarkeit
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    Artikel (Nationallizenzen)
    Volltext
  • 2
    Digitale Medien
    Digitale Medien
    Morphological Structure and Chemical Composition of Cometary Nuclei and Dust (1999)
    Springer
    Space science reviews 90 (1999), S. 149-161 
    Details
    ISSN: 1572-9672
    Schlagwort(e): ISM: dust ; ISM: molecules ; ISM: abundances ; Comets: general ; Comets: individual: Halley, Borrelly, Hale-Bopp ; Stars: individual: β Pictoris ; Stars: circumstellar matter ; Stars: planetary systems
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: 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.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1023/A:1005298014670
    Standort Signatur Erwartet Verfügbarkeit
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    Artikel (Nationallizenzen)
    Volltext
  • 3
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    Unbekannt
    Evaluating NASA Technology Programs in Terms of Private Sector Impacts (1984)
    In:  CASI
    Details
    Publikationsdatum: 2014-09-12
    Beschreibung: NASA is currently developing spacecraft technology for application to NASA scientific missions, military missions and commercial missions which are part of or form the basis of private sector business ventures. The justification of R&D programs that lead to spacecraft technology improvements encompasses the establishment of the benefits in terms of improved scientific knowledge that may result from new and/or improved NASA science missions, improved cost effectiveness of NASA and DOD missions and new or improved services that may be offered by the private sector (for example communications satellite services). It is with the latter of these areas that attention will be focused upon. In particular, it is of interest to establish the economic value of spacecraft technology improvements to private sector communications satellite business ventures. It is proposed to assess the value of spacecraft technology improvements in terms of the changes in cash flow and present value of cash flows, that may result from the use of new and/or improved spacecraft technology for specific types of private sector communications satellite missions (for example domestic point-to-point communication or direct broadcasting). To accomplish this it is necessary to place the new and/or improved technology within typical business scenarios and estimate the impacts of technical performance upon business and financial performance.
    Schlagwort(e): ASTRONAUTICS (GENERAL)
    Materialart: NASA. Lewis Research Center Space Power; p 45-50
    Format: text
    Standort Signatur Erwartet Verfügbarkeit
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    NASA TECHNICAL REPORTS
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