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  • 1965-1969  (3)
  • 1
    Electronic Resource
    Electronic Resource
    Coupling of a quasi-particle to the pairing vibrations (1968)
    Springer
    The European physical journal 209 (1968), S. 428-439 
    Details
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The intermediate coupling model of odd nuclei, where a nucleon is coupled to the surface vibration of an even system, has been successfully used in explaining various nuclear properties. In this paper, it is pointed out that a similar picture is applicable to improve the BCS approximation for seniority-one states in the pairing force model by considering coupling of a quasi-particle to the pairing normal modes. It is shown that this model is, in part, equivalent to the variational approach which takes the blocking effect into account. Several models are compared numerically.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01380548
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Adsorption of polymers at the solution-solid interface (1969)
    Springer
    Colloid & polymer science 229 (1969), S. 17-21 
    Details
    ISSN: 1435-1536
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Description / Table of Contents: Zusammenfassung Die Adsorption von Polyvinyl-Azetat als Lösung an Glaspulver wurde untersucht. Die Adsorption ist unabhängig vom Molekulargewicht, und man kann sagen, daß das Polymere flach auf der Adsorbens-Oberfläche liegt. Andererseits hängt das Ausmaß der Adsorption stark von der Art des Lösungsmittels in einer Weise ab, welche mit Hilfe von Lösungsmittelparametern und Gestalt des Polymerknäuels in der Lösung diskutiert werden kann. Gute lineare Beziehungen wurden zwischen der maximalen Adsorption und der Differenz der Lösungsmittel-Parameter zwischen Polymeren und Lösungsmittel gefunden. Und ebenfalls eine lineare Abhängigkeit wurde erhalten, wenn das spezifische Volumen des Polymeren gegen das Maximum der Adsorption aufgetragen wurde. Die maximale Adsorption nahm ab mit steigendem spezifischen Volumen. Man kann sagen, das Polymere wird an der festen Oberfläche adsorbiert und bedeckt eine Fläche, die proportional zur Größe des Knäuels in der Lösung ist.
    Notes: Synopsis The adsorption of polyvinyl acetate from solution onto glass powders was studied. The adsorption is independent of molecular weight and it can be said that polymer lies flat on the adsorbent surface. On the other hand, the extent of adsorption depends strongly upon the sort of the solvent in a manner which can be discussed with solubility parameter and size of the polymer coil in the solution. Good linear relation was obtained between maximum adsorption and difference of the solubility parameter between polymer and solvent. And also a straight line was obtained when specific volume of the polymer was plotted against maximum adsorption. Maximum adsorption decreases with increasing specific volume. It would be said that polymer is adsorbed on the solid surface with its occupied area which is proportional to the size of coil in the solution.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01542500
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Adhesion of polyethylene (1969)
    Springer
    Colloid & polymer science 229 (1969), S. 4-7 
    Details
    ISSN: 1435-1536
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Description / Table of Contents: Zusammenfassung Die Oxydation durch gasförmigen Sauerstoff katalysiert mit Kobalt-Azetat ließ sich als wirksame Methode zur Einführung polarer Gruppen in Polyäthylen anwenden. Die meisten polaren Gruppen wurden als Carbonylgruppen in Ketonform eingeführt. Die scheinbare Aktivierungsenergie der flüssigen Phasen-Oxydation beträgt 25,6 kcal/mol und liegt etwa zwischen ozon-katalysierter Oxydation und Oxydation durch rauchende Salpetersäure. Der Abbau der Polymeren während der Oxydation wurde ebenfalls durch die Abnahme des Molekulargewichts beobachtet.
    Notes: Summary Liquid phase oxidation by oxygen gas catalysed with cobalt acetate is employed as effective method for introduction of polar groups to polyethylene. Main polar groups introduced were carbonyl groups in ketone form. Apparent activation energy of liquid phase oxidation 25.6 Kcal/mole is intermediate between these ozone catalyzed oxidation and fuming HNO3 oxidation. Degradation of polymer during oxidation was also recognized by the decrease of molecular weight.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01542497
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    Paper (German National Licenses)
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