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  • 1990-1994
  • 1985-1989  (4)
  • 1987  (4)
Material
Years
  • 1990-1994
  • 1985-1989  (4)
Year
  • 1
    Electronic Resource
    Electronic Resource
    s.l. : American Chemical Society
    Journal of the American Chemical Society 109 (1987), S. 6902-6904 
    ISSN: 1520-5126
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    The European physical journal 326 (1987), S. 313-326 
    ISSN: 1434-601X
    Keywords: 25.70.Jj
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Fission-fragment angular distributions were measured in the reaction of40Ar with208Pb near the fusion barrier. For nearly symmetric mass-/charge splits we find angular distributions symmetric around θ=90 degrees, however, with unusually large anisotropies. These develop gradually into forward-backward asymmetric distributions as one moves away from mass-/charge symmetry. This indicates that non-compound fission (‘quasi-fission’) competes with true fusion-fission. The relative contribution of quasi-fission to the total fission cross section is somewhere between 51 and 85%. In the framework of the extra-push model this is equivalent to an extra-extra push energy for compound-nucleus formation inside the true fission saddle point of 4〈E xx 〈9 MeV in agreement with a recent empirical parametrization of fusion-barrier shifts based on fusion-fission cross sections. On the basis of cross sections for fusion-evaporation residues it had previously been concluded that fusion of40Ar with Pb isotopes occurs unhindered. Possible reasons for this apparent discrepancy are discussed.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Materialwissenschaft und Werkstofftechnik 18 (1987), S. 241-250 
    ISSN: 0933-5137
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Description / Table of Contents: Aspects of the Powder Metallurgy of High-Strength Light Metal Alloys on Aluminium and Titanium BaseAdvantages expected from powder metallurgy  -  cost reduction, improvement of properties and development of new alloys not producible by conventional ingot metallurgy  -  were tried likewise to be applied to high-strength light weight alloys for more than ten years. State of the art and problems still to be solved are reviewed with respect to the particular objectives, and future trends of development are pointed out. For aluminium alloys, the main objective is the improvement of properties, e. g. higher elevated temperature strength by rapid solidification and mechanical alloying, whereas in the case of titanium alloys first of all the reduction of production costs was aspired. Meanwhile, improved properties could be achieved by rapid solidification for titanium alloys as well. But, the improvement of economy still remains an important task to be solved for both types of alloys.
    Notes: Die von der Pulvermetallurgie erwarteten Vorteile  -  Kostensenkung, Verbesserung der Eigenschaften und Entwicklung neuer Werkstoffe, die über den Schmelzweg nicht herstellbar sind  -  hat man seit über zehn Jahren auch für hochfeste Leichtmetallegierungen zu nutzen versucht. Der jetzige Stand und die noch zu lösenden Probleme werden im Licht der jeweiligen Zielsetzungen umrissen und Entwicklungstrends aufgezeigt. Während bei Aluminiumlegierungen Eigenschaftsverbesserungen wie z. B. größere Warmfestigkeit durch schnelle Erstarrung und mechanisches Legieren im Vordergrund stehen, wurde bei Titanlegierungen zunächst eine Kostensenkung angestrebt. Verbesserte Eigenschaften konnten aber z. B. durch schnelle Erstarrung auch an Titanlegierungen erzielt werden. Die Erhöhung der Wirtschaftlichkeit ist für beide Legierungsarten eine noch zu lösende, wichtige Aufgabe.
    Additional Material: 13 Ill.
    Type of Medium: Electronic Resource
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