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  • ECONOMICS AND COST ANALYSIS  (4)
  • 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)
    Fulltext
  • 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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    Communications satellite business ventures - Measuring the impact of technology programmes and related policies (1986)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: An economic evaluation and planning procedure which assesses the effects of various policies on fixed satellite business ventures is described. The procedure is based on a stochastic financial simulation model, the Domsat II, which evaluates spacecraft reliability, market performance, and cost uncertainties. The application of the Domsat II model to the assessment of NASA's ion thrusters for on-orbit propulsion and GaAs solar cell technology is discussed. The effects of insurance rates and the self-insurance option on the financial performance of communication satellite business ventures are investigated. The selection of a transportation system for placing the satellites into GEO is analyzed.
    Keywords: ECONOMICS AND COST ANALYSIS
    Type: Space Policy (ISSN 0265-9646); 2; 37-51
    Format: text
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    NASA TECHNICAL REPORTS
  • 5
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    Some economic benefits of a synchronous earth observatory satellite (1974)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: An analysis was made of the economic benefits which might be derived from reduced forecasting errors made possible by data obtained from a synchronous satellite system which can collect earth observation and meteorological data continuously and on demand. User costs directly associated with achieving benefits are included. In the analysis, benefits were evaluated which might be obtained as a result of improved thunderstorm forecasting, frost warning, and grain harvest forecasting capabilities. The anticipated system capabilities were used to arrive at realistic estimates of system performance on which to base the benefit analysis. Emphasis was placed on the benefits which result from system forecasting accuracies. Benefits from improved thunderstorm forecasts are indicated for the construction, air transportation, and agricultural industries. The effects of improved frost warning capability on the citrus crop are determined. The benefits from improved grain forecasting capability are evaluated in terms of both U.S. benefits resulting from domestic grain distribution and U.S. benefits from international grain distribution.
    Keywords: ECONOMICS AND COST ANALYSIS
    Type: NASA-CR-143636 , ERIM-107400-3-F
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 6
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    Economic benefits of improved meteorological forecasts - The construction industry (1976)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: Estimates are made of the potential economic benefits accruing to particular industries from timely utilization of satellite-derived six-hour weather forecasts, and of economic penalties resulting from failure to utilize such forecasts in day-to-day planning. The cost estimate study is centered on the U.S. construction industry, with results simplified to yes/no 6-hr forecasts on thunderstorm activity and work/no work decisions. Effects of weather elements (thunderstorms, snow and sleet) on various construction operations are indicated. Potential dollar benefits for other industries, including air transportation and other forms of transportation, are diagrammed for comparison. Geosynchronous satellites such as STORMSAT, SEOS, and SMS/GOES are considered as sources of the forecast data.
    Keywords: ECONOMICS AND COST ANALYSIS
    Type: IAF PAPER 76-128 , International Astronautical Congress; Oct 10, 1976 - Oct 16, 1976; Anaheim, CA
    Format: text
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    NASA TECHNICAL REPORTS
  • 7
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    Benefit cost analysis in federal agency R and D program formulation (1976)
    In:  Other Sources
    Details
    Publication Date: 2019-07-27
    Description: Benefit-cost analysis is defined and some government investment criteria are discussed in relation to federal agency research and development program planning. The benefits of applied research and development are examined on the basis of a decision tree approach, and R and D project selection is considered, with attention paid to the multi-attribute problem.
    Keywords: ECONOMICS AND COST ANALYSIS
    Type: The future of aeronautical transportation; Nov. 10, 11, 1975; Princeton, N. J.
    Format: text
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    NASA TECHNICAL REPORTS
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