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  • Articles: DFG German National Licenses  (3)
  • 1975-1979  (3)
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  • Articles: DFG German National Licenses  (3)
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Years
Year
  • 1
    Electronic Resource
    Electronic Resource
    Springer
    The European physical journal 20 (1975), S. 81-87 
    ISSN: 1434-6036
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We propose a new mechanism for an anomalous thermoelectric power (ATP) in the paramagnetic state of certain rare earth metals and their compounds, in which the ions possess a nonmagnetic ground state in a given crystal field. The ATP is found to be due to higher order inelastic scattering (second Born approximation) of the conduction electrons by the crystal field split rare earth ions. It has a peak at a temperatureΔ/3 ~Δ/2, whereΔ is the splitting energy between the ground state and the first excited state. Our main result is that the appearance of an ATP requires interactions between the conduction electrons and the ions of other than the simple isotropic exchange type. This implies that the ATP may serve as a valuable tool to detect more complicated types of thek-f interaction than the isotropic exchange.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    The European physical journal 23 (1976), S. 45-48 
    ISSN: 1434-6036
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract It is shown that thed-electron surface density of states of a transition metal is strongly influenced not only by “off-diagonal” surface effects (e.g. reduction of nearest neighbors at the surface) but also by “diagonal” surface effects. Latter result from differences in the effective atomic potential for differentd-orbitals. They lead generally to large resonant contributions to the surface density of states. It is demonstrated that the “diagonal” effects must be included in any realistic calculation of the surface density of states.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Rheologica acta 15 (1976), S. 268-270 
    ISSN: 1435-1528
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: Zusammenfassung Zur Untersuchung der Mischwirkung des Maxwell-Extruders (elastic melt extruder) bei Polymeren mit Füllstoff wurde ein solches Gerät konstruiert und damit die Extrusion von Polyäthylen mit Glaskugeln bzw. Kalziumkarbonat untersucht. Zur Gewährleistung einer stabilen Arbeitsweise wurde der Hauptscherzone des Geräts eine Hilfseinrichtung nachgeschaltet. Der Füllstoffgehalt im Extrudat wurde in regelmäßigen Zeitabständen bestimmt. Die Variation des Füllstoffgehalts mit der Zeit ließ sich durch einfache Gleichungen beschreiben, die aufgrund der Annahme abgeleitet worden waren, daß das eingegebene Material mit dem Material in der Scherzone momentan zur Durchmischung kommt. Es wurde eine zufriedenstellende Gleichmäßigkeit der Füllstoffverteilung im Extrudat gefunden.
    Notes: Summary In order to examine the mixing effect of fillers and polymers by the elastic melt extruder, an apparatus was constructed and extrusions of glass beads/polyethylene and calcium carbonate/polyethylene were carried out. To ensure the stable operation a submechanism was connected in series to the main shearing zone of the apparatus. The content of filler in the extrudate was determined at stated time interval. The variation of filler content with time was represented by simple equations derived from the assumption that the material newly fed was mixed instantaneously with the material in the shearing zone. It was also found that the distribution of filler in the extrudate was satisfactory.
    Type of Medium: Electronic Resource
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