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  • GROUND SUPPORT SYSTEMS AND FACILITIES (SPACE)  (4)
  • Polymer and Materials Science  (4)
  • SPACE COMMUNICATIONS, SPACECRAFT COMMUNICATIONS, COMMAND AND TRACKING  (4)
  • 1
    Electronic Resource
    Electronic Resource
    Biodegradability of photooxidized polyalkylenes (1984)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 29 (1984), S. 2581-2597 
    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: Representative polyolefin films were exposed to UV radiation from light sources having different intensities and spectral distribution including the quartz mercury arc fluorescent lamps, xenon arc, and sunlight. Films exposed were polyethylene, polypropylene, and sensitized polyethylene. The oligomer fractions supported microbial growth, but the high polymers gave minimal or no growth. It was concluded that photooxidative degradation of polyolefins does not per se induce progressive attack by microorganisms. Oligomers present originally in the polymer are augmented by those produced by photooxidation. These oligomers support growth if separated from the polymer matrix. These observations explain some of the contradictory reports in the literature concerning the microbial degradation of sensitized polyolefins.
    Additional Material: 10 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1984.070290814
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Pressure quenching and chain-extended crystallization of polyethylene (1975)
    New York : Wiley-Blackwell
    Journal of Polymer Science: Polymer Physics Edition 13 (1975), S. 1501-1509 
    Details
    ISSN: 0098-1273
    Keywords: Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Recent work has shown that so-called chain-extended crystallization of polyethylene is crystallization of the newly discovered hexagonal phase. This hypothesis is supported by experiments on the pressure quenching of molten polyethylene.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1975.180130804
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Hydrogen chain transfer in olefin polymerization with organometallic catalysts (1978)
    New York : Wiley-Blackwell
    Journal of Polymer Science: Polymer Chemistry Edition 16 (1978), S. 2337-2342 
    Details
    ISSN: 0360-6376
    Keywords: Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Hydrogen has been shown to be a true chain-transfer agent with some organometallic olefin polymerization catalysts. However, the Mayo equation for chain transfer in free-radical polymerization does not fit quantitative data from organometallic catalysts. There appear to be two reasons for the lack of fit. First, the Mayo equation considers the competition between hydrogen and olefin for the growing chain but does not account for their competitive absorption on the catalyst (coordination with vacant orbitals on the transition metal). Second, some organometallic catalysts gradually absorb hydrogen irreversibly to give a new catalyst species of altered behavior.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1978.170160920
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  • 4
    Electronic Resource
    Electronic Resource
    Molecular weight distribution in polypropylene glycol 2025 (1963)
    New York : Wiley-Blackwell
    Journal of Polymer Science Part A: General Papers 1 (1963), S. 1041-1048 
    Details
    ISSN: 0449-2951
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: The new applications of polypropylene glycols as chemical intermediates, particularly in the polyurethane field, have shifted emphasis from purely physical properties, such as density, viscosity, and volatility, to chemical properties, such as hydroxyl content, unsaturation, and molecular weight: Because much interest is also being shown in the uniformity of chain length, i.e., the “molecular purity” of the polypropylene glycol, methods were investigated for measuring this property. A liquid chromatographic procedure has been developed which will yield molecular weight distributions for polypropylene glycols in the 2025 number-average molecular weight range. The results approximate, but do not match, the values obtained by theoretical calculations. Details of the method and a typical distribution curve are presented.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1963.100010317
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  • 5
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    Helios mission support (1975)
    In:  CASI
    Details
    Publication Date: 2006-01-12
    Description: Testing activities of the Helios-B spacecraft were reported. This spacecraft has completed its dual superior conjunctions and second perihelion passage of the sun and is rapidly approaching its second aphelion, near the earth's heliocentric trajectory. Valuable scientific data was obtained during these two important events.
    Keywords: GROUND SUPPORT SYSTEMS AND FACILITIES (SPACE)
    Type: The Deep Space Network; p 65-69
    Format: text
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    NASA TECHNICAL REPORTS
  • 6
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    Helios mission support (1976)
    In:  Other Sources
    Details
    Publication Date: 2011-08-16
    Description: The successful flight of the Helios-1 spacecraft continues as it approaches its third aphelion. The Helios-2 spacecraft has entered its first superior conjunction and continues in excellent health. Much valuable scientific information about the solar corona and its effects on electromagnetic waves is expected to be learned from data gathered during this superior conjunction.
    Keywords: GROUND SUPPORT SYSTEMS AND FACILITIES (SPACE)
    Type: The Deep Space Network; p 21-32
    Format: text
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    NASA TECHNICAL REPORTS
  • 7
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    Helios mission support (1976)
    In:  Other Sources
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    Publication Date: 2011-08-16
    Description: With Helios-1 completing its third perihelion and Helios-2 passing its first perihelion, much valuable scientific data were obtained about the inter-earth-sun regions. The first solar occultation of Helios-2 is anxiously awaited as the next important mission phase. Preparations are underway for Helios-2 first entry into solar occultation in mid-May 1976. This article reports on the activities around Helios-1 and -2 perihelions.
    Keywords: GROUND SUPPORT SYSTEMS AND FACILITIES (SPACE)
    Type: The Deep Space Network; p 27-31
    Format: text
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    NASA TECHNICAL REPORTS
  • 8
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    Helios mission support (1976)
    In:  Other Sources
    Details
    Publication Date: 2011-08-17
    Description: The Helios-1 third solar occultation and fourth perihelion is covered. A Helios-2 spacecraft emergency and third solar conjunction (occultation) are also discussed. Additional topics include STDN-DSN telemetry and command cross-support, Ground Data System tests, tracking coverage, plus DSN system performance for August and September 1976.
    Keywords: GROUND SUPPORT SYSTEMS AND FACILITIES (SPACE)
    Type: The Deep Space Network; p 28-34
    Format: text
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    NASA TECHNICAL REPORTS
  • 9
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    Helios mission support (1976)
    In:  Other Sources
    Details
    Publication Date: 2011-08-17
    Description: Deep Space Network support of the Helios mission is reported. Downlink signal degradation on the Helios-1 spacecraft and occultation of Helios-2 are discussed. Capability and performance of the network are assessed.
    Keywords: SPACE COMMUNICATIONS, SPACECRAFT COMMUNICATIONS, COMMAND AND TRACKING
    Type: The Deep Space Network; p 24-27
    Format: text
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    NASA TECHNICAL REPORTS
  • 10
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    Sequencing Voyager II for the Uranus encounter (1986)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: The process of developing the programmed sequence of events necessary for the Voyager 2 spacecraft to return desired data from its Uranus encounter is discussed. The major steps in the sequence process are reviewed, and the elements of the Mission Sequence Software are described. The design phase and the implementation phase of the sequence process are discussed, and the Computer Command Subsystem architecture is examined in detail. The software's role in constructing the sequences and converting them into onboard programs is elucidated, and the problems unique to the Uranus encounter sequences are considered.
    Keywords: SPACE COMMUNICATIONS, SPACECRAFT COMMUNICATIONS, COMMAND AND TRACKING
    Type: AIAA PAPER 86-2111
    Format: text
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    NASA TECHNICAL REPORTS
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