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  • 1990-1994
  • 1975-1979
  • 1965-1969  (4)
  • 1940-1944
  • 1969  (2)
  • 1967  (2)
Material
Years
  • 1990-1994
  • 1975-1979
  • 1965-1969  (4)
  • 1940-1944
Year
  • 1
    Electronic Resource
    Electronic Resource
    Springer
    The European physical journal 221 (1969), S. 186-210 
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The mobility of impurities in He3 is calculated using Kubo's formula and assuming a quasi-particle-like behaviour of the impurities. This is reasonable in the low temperature limit. If one has to deal with charged particles having a large cross-section for the scattering of He3 quasi-particles on account of their large effective radii, this limit is as low as presumably 0.01 °K. For uncharged particles the validity of the theory is not confined to such a small region of the temperature. The mobility behaves as 1/T 2 and its dependence upon the frequency is almost that of a classical sphere experiencing a force of friction proportional to its velocity. The parameters occuring in the formula for the mobility (the effective mass and the scattering cross-section between He3 and the impurities) may in principle be determined by independent experiments.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Acta mechanica 4 (1967), S. 398-398 
    ISSN: 1619-6937
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 311 (1969), S. 596-603 
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Bei der Umsetzung von Isopropyl-, Neopentyl- und Cyclohexylsulfochlorid mit Natriumphenolaten in Gegenwart von D2O entstehen α-monodeuterierte Alkansulfonsäurearyl-ester. Bei der Umsetzung von 2-Deutero-2-propylsulfochlorid mit Natriumphenolat tritt ein kinetischer Isotopieeffekt kH:kD∼4,5 auf. Offenbar verlaufen die untersuchten Reaktionen nach einem Eliminierungs-Additions-Mechanismus über Sulfene als Zwischenprodukte.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 101 (1967), S. 320-336 
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: The preparation of homopolymers of butadiene in the presence of cobalt and vanadium-containing ZIEGLER-catalysts is reported and the influence of water on the reaction system is investigated. Furthermore, the preparation of copolymers of butadiene with isoprene, 1,3-pentadiene, and styrene in the presence of the catalysts is described and the technical properties of the polymers discussed.While, the homopolymers have a sterically uniform structure, butadiene is sterically less regularly introduced into the copolymers. Only in the case of containing catalysts, butadiene is homo- and co-polymerized in 1,4-trans position.Individual technical properties of the copolymers yet not the properties as a whole are superior to 1,4cis-polybutadiene.
    Notes: Es wird über die Darstellung von Homopolymeren des Butadiens mit Hilfe von kobalt und vanadinhaltigen ZIEGLER-Katalysatoren berichtet und der Einfluß des Wassers im Reaktionssystem untersucht. Ferner werden die Herstellung von Copolymeren des Butadiens mit Isopren, Pentadien- (1,3) und Styrol mit diesen Katalysatoren geschildert und die anwendungstechnischen Eigenschaften der Polymeren besprochen.Während die Homopolymeren einen sterisch weitgehend regelmäßigen Aufbau besitzen, wird das Butadien in den Copolymeren in fast allen Fällen weniger regelmäßig eingebaut. Nur mit vanadinhaltigen Katalysatoren wird Butadien auch in den Copolymeren ausschließ-lich in 1,4-trans-Stellung incorporiert.Die Copolymeren übertreffen zwar in einzelnen anwendungstechnischen Eigenschaften das 1,4-cis-Polybutadien, nicht jedoch in den Gesamteigenschaften.
    Additional Material: 9 Ill.
    Type of Medium: Electronic Resource
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