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  • 1
    Electronic Resource
    Electronic Resource
    Molecular weight distribution in alkyd resins. Part I (1964)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 8 (1964), S. 659-671 
    Details
    ISSN: 0021-8995
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: The factors which could affect the molecular weight distribution of a fatty acid modified polyester (alkyd) are discussed. Specific studies on a 33% coconut oil/glycerol/phthalic anhydride polymer are described, and the effect of monoglyceride composition on alkyd distribution and film properties of an automotive baking enamel are considered.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1964.070080208
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Molecular weight distribution of liquid poly(ethylene glycols): Determination by gas chromatography (1968)
    New York : Wiley-Blackwell
    Journal of Polymer Science Part A-1: Polymer Chemistry 6 (1968), S. 1025-1032 
    Details
    ISSN: 0449-296X
    Keywords: Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The molecular weight distribution of liquid polyethylene glycols 200, 300, and 400 can be determined by gas chromatography by using trimethylsilyl ether derivatives. The relative response factors for the first five members of the homologous series were determined experimentally. Attempts are made to extrapolate the experimental data to relative response factors for higher members of the homologous series.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1968.150060431
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    Paper (German National Licenses)
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  • 3
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    Combustion Of Porous Graphite Particles In Oxygen Enriched Air (2003)
    In:  CASI
    Details
    Publication Date: 2019-07-10
    Description: Combustion of solid fuel particles has many important applications, including power generation and space propulsion systems. The current models available for describing the combustion process of these particles, especially porous solid particles, include various simplifying approximations. One of the most limiting approximations is the lumping of the physical properties of the porous fuel with the heterogeneous chemical reaction rate constants [1]. The primary objective of the present work is to develop a rigorous modeling approach that could decouple such physical and chemical effects from the global heterogeneous reaction rates. For the purpose of validating this model, experiments with porous graphite particles of varying sizes and porosity are being performed under normal and micro gravity.
    Keywords: Aircraft Propulsion and Power
    Type: Seventh International Workshop on Microgravity Combustion and Chemically Reacting Systems; 9-12; NASA/CP-2003-212376-REV1
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 4
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    Public service satellites (1977)
    In:  Other Sources
    Details
    Publication Date: 2019-08-27
    Description: The development of the communications satellite system is discussed, taking into account a suggestion by Clarke in 1945 concerning the significance of geosynchronous satellites, the establishment of Intelsat, reductions in the cost of transatlantic telephone calls as a result of satellite communications service, questions of satellite cost, and the need for larger satellites. It is pointed out that the use of the Space Shuttle will reduce the cost of placing a satellite in orbit from more than half to less than a quarter of the total cost of design, construction, and launch. Attention is given to studies of a personal communications system which involves direct broadcast from a 'wrist watch radio' to a high-capacity, multibeam satellite for retransmission to ground communications centrals.
    Keywords: ASTRONAUTICS (GENERAL)
    Type: Spaceflight; 19; Apr. 197
    Format: text
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    NASA TECHNICAL REPORTS
  • 5
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    Reusable space systems (Eugen Saenger Lecture, 1987) (1988)
    In:  Other Sources
    Details
    Publication Date: 2019-08-27
    Description: The history and current status of reusable launch vehicle (RLV) development are surveyed, with emphases on the contributions of Eugen Saenger and ongoing NASA projects. Topics addressed include the capabilities and achievements of the Space Shuttle, the need to maintain a fleet with both ELVs and RLVs to meet different mission requirements, the X-30 testbed aircraft for the National Aerospace Plane program, current design concepts for Shuttle II (a 1000-ton fully reusable two-stage rocket-powered spacecraft capable of carrying 11,000 kg to Space Station orbit), proposals for dual-fuel-propulsion SSTO RLVs, and the Space Station Orbital Maneuvering Vehicle and Orbital Transfer Vehicle. The importance of RLVs and of international cooperation in establishing the LEO infrastructure needed for planetary exploration missions is stressed.
    Keywords: ASTRONAUTICS (GENERAL)
    Type: Zeitschrift fuer Flugwissenschaften und Weltraumforschung (ISSN 0342-068X); 12; 1-5
    Format: text
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    NASA TECHNICAL REPORTS
  • 6
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    A new era of space transportation (1976)
    In:  Other Sources
    Details
    Publication Date: 2019-08-28
    Description: It is pointed out that founded on the experiences of Apollo, Skylab, and the Apollo/Soyuz mission an era is entered which will be characterized by a displacement of the interface between the experimenter and his experiment from the control center on the ground to the laboratory in orbit. A new world has been opened by going into space. Economic applications are related to the achievement of an enormous efficiency in world communications at a much lower cost. However, programs of space exploration and usage are under severe economic constraints. A primary tool to lower the cost of programs is to be the Space Transportation System using the Space Shuttle. It is emphasized that the Shuttle system is an international enterprise. Attention is also given to the results of the Viking missions, the Landsat satellites, and applications of space technology for science and commerce.
    Keywords: ASTRONAUTICS (GENERAL)
    Type: IAF PAPER V-76-1 , International Astronautical Congress; Oct 10, 1976 - Oct 16, 1976; Anaheim, CA
    Format: text
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    NASA TECHNICAL REPORTS
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