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  • 1990-1994  (2)
  • 1980-1984  (2)
  • 1965-1969
  • Polymer and Materials Science  (2)
  • 25.55.-e  (1)
  • Conductance  (1)
Material
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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Journal of solution chemistry 13 (1984), S. 103-119 
    ISSN: 1572-8927
    Keywords: Conductance ; Walden product ; tetraphenylarsonium and tetraphenylboride ions ; pyridine-water and acetonitrile-water mixtures ; alkali metal salts ; copper salts ; ion-solvent interactions ; structural effects
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The limiting conductance of various salts of Na+, Ag+, Cu+, Cu2+ and Ph4As+ in acetonitrile-water (AN-H2O) and pyridine-water (Py−H2O) mixtures are reported. Single ion values are calculated for AN-H2O mixtures using the TATB assumption [λo(Ph 4 As +) = λo(Ph 4 B −)]. The trends observed for the limiting Walden products (λoη) of the electrolytes and individual ions are discussed in terms of specific ion-solvent interactions and the structural effects of the solvent mixtures.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1434-601X
    Keywords: 24.60.Dr ; 25.55.-e ; 25.70.Gh
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Reaction product cross sections have been measured for reactions of4He projectile with54,56Fe,58Ni and59Co targets in the bombarding energy range 14–27 MeV. The cross-section-weighted average charge $$\overline {\Delta Z}$$ and mass $$\overline {\Delta A}$$ removed from the compound system were deduced and compared with results reported for heavy-ion induced reactions. Variation of $$\overline {\Delta A}$$ with E CN * is independent of the initial angular momentum of compound nucleus in theA=60 mass region in contrary to the rare-earth region. This would suggest a strong angular momentum removal from the compound nucleus by evaporation of particles forA≈60 nuclei. The average evaporated charge $$\overline {\Delta Z}$$ depends on both the CN excitation energy E CN * and the compound nucleusN andZ numbers. The $$\overline {\Delta A}$$ and $$\overline {\Delta Z}$$ dependence on excitation energy and the projectile-target combination can be understood in terms of the statistical model calculations.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Weinheim [u.a.] : Wiley-Blackwell
    Materials and Corrosion/Werkstoffe und Korrosion 31 (1980), S. 682-688 
    ISSN: 0947-5117
    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: Mechanismus des Transports von Schwefel durch vorher entstandene OxidzunderschichtenDie Möglichkeiten für den Transport von Schwefel durch vorher entstandene Oxidzunderschichten werden thermodynamisch untersucht, wobei die Grenzbedingungen ermittelt werden, unter denen die verschiedenen Mechanismen - Auflösung und Diffusion, Moleküldiffusion und Gasdiffusion - auftreten können. Die Ergebnisse werden für Nickel und Kobalt überprüft; daraus ergibt sich der Schluß, daß zwar grundsätzlich beide Mechanismen parallel vorliegen können, daß jedoch die Permeation von Gasmolekülen gefährlicher ist, da sie in einem breiteren Bereich von Gaszusammensetzungen wirksam werden kann. Außerdem wird deutlich gezeigt, daß durch die auf Kobalt aufwachsenden Oxidzunderschichten Schwefeldioxidmoleküle diffundieren können.
    Notes: The possibilities for transport of sulfur through preformed oxide scales by both solution-diffusion and molecular gas (24) permeation mechanisms are examined thermodynamically to establish the limiting conditions under which each is viable.The results are tested, using nickel and cobalt specimens, and it is concluded that, although both mechanisms may operate in parallel, the permeation of gas molecules is the more dangerous since it can operate over wider ranges of gas atmosphere composition. The permeation of SO2 molecules throu through oxide scales growing on cobalt is clearly demonstrated.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Acta Polymerica 41 (1990), S. 48-51 
    ISSN: 0323-7648
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: Aus dem Polymer CR-39(DOP) wurden Thermoelektrete formiert, und die thermisch stimulierten Entladungsströme wurden gemessen. Die Einflüsse unterschiedlicher Formierungstemperaturen, unterschiedlicher Feldstärken und der Lagerzeit wurden untersucht, um das Elektretverhalten dieses Materials zu beschreiben. Die Polarisation ist dipolaren Ursprungs. Die Aktivierungsenergic und die Relaxationszeit wurden berechnet.
    Notes: Thermoelectrets of CR-39(DOP) were formed and their thermally stimulated discharge current studied. In the present work, effects of different forming temperatures, polarizing fields and storage times have been studies with a view to understand the electret behaviour of this material. The polarization seems to have a dipolar origin. The activation energy and relaxation times have also been calculated.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
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