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  • 1975-1979  (8)
Collection
Year
  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Zeitschrift für angewandte Mathematik und Physik 28 (1977), S. 1017-1026 
    ISSN: 1420-9039
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics , Physics
    Description / Table of Contents: Zusammenfassung Es werden einige Einschränkungen für die Randbedingungen in der Kontinuumsmechanik behandelt, die von der Forderung herrühren, dass für die Materie ausserhalb der Grenzfläche die fundamentalen Bilanzgleichungen, die Invarianzbedingungen und die Entropieungleichung gelten sollen. Diese Behauptungen werden für polare Materialien erläutert, jedoch sind die hier eingeführten Begriffe auf Kontinuumstheorien aller Art anwendbar.
    Notes: Summary We discuss some restrictions on boundary conditions in continuum mechanics arising from the requirement that the basic balance laws, invariance conditions and entropy inequality must hold for the material outside of the bounding surface. We illustrate our assertions for polar materials, but the ideas we use are applicable to all continuum theories.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Rheologica acta 16 (1977), S. 213-222 
    ISSN: 1435-1528
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: Zusammenfassung Das Isotop Helium 4 unter 2,2°K, bekannt als Helium II, zeigt einige merkwürdige mechanische und thermische makroskopische Effekte. In dieser Arbeit wird eine mögliche Alternative zu der Zweiflüssigkeitentheorie für Helium II besprochen. Standardmethoden der Kontinuumsmechanik werden benutzt, um den Fluß gewisser mikroskopischer Anregungszustände zu beschreiben, die als Ursache der beobachteten Effekte angesehen werden. Passende Bilanzgleichungen werden aufgestellt und Stoffgleichungen vorgeschlagen. Einige einfache Lösungen der sich ergebenden Theorie werden diskutiert, die qualitative Übereinstimmung mit den beobachteten Effekten liefern. Diese Effekte betreffen das Experiment der hängenden Platte von Hall, den Springbrunneneffekt und Schall-Wellen zweiter Art bei kleinen Amplituden.
    Notes: Summary The isotope helium 4 below 2.2°K, known as helium II, exhibits a number of curious mechanical and thermal macroscopic effects. In this paper a possible alternative to the two-fluid theory for helium II is reviewed. Standard techniques of continuum mechanics are used to describe the flow of certain microscopic excitations which are believed to give rise to the observed effects. Appropriate balance laws are formulated and constitutive equations are proposed. Some simple solutions of the resulting theory are discussed which give qualitative agreement with observed effects. These effects include Hall's hanging plate experiment, the fountain effect and smallamplitude second-sound waves.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Journal of elasticity 5 (1975), S. 237-248 
    ISSN: 1573-2681
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract Standard techniques of continuum mechanics are used to describe the flow of certain microscopic excitations which are believed to give rise to the second-sound phenomena in some materials at low temperatures. Appropriate balance laws are formulated, and constitutive equations for an elastic solid are postulated. The propagation of small-amplitude second-sound waves is discussed and the results compared with those predicted by the theory of Lord and Shulman [1].
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Springer
    Acta mechanica 21 (1975), S. 221-239 
    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
    Description / Table of Contents: Zusammenfassung Unter Verwendung der vonGreen andRivlin [1] angegebenen allgemeinen Theorie multipolarer Werkstoffe wird eine mögliche Alternative zu den Zweiphasentheorien von flüssigem Helium II diskutiert. Im speziellen wird die Existenz von Wellen mit zweiter Schallgeschwindigkeit, die in der, in stationärer wie auch in rotierender Flüssigkeit beobachteten Art abgemindert werden. Weiters wird eine mögliche Analogie des Konzepts einer gequantelten Wirbellinie vorgeschlagen.
    Notes: Summary Using the general framework of multipolar continuum mechanics as developed byGreen andRivlin [1], we discuss a possible alternative to the two-fluid theories of liquid helium II. We show in particular that our theory predicts the existence of second-sound waves which are attenuated in the manner obseved both in the stationary fluid and also in the rotating fluid. Moreover we suggest a possible continuum analogue of the concept of quantised vortex lines.
    Type of Medium: Electronic Resource
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  • 5
    Publication Date: 1975-09-01
    Print ISSN: 0022-460X
    Electronic ISSN: 1095-8568
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Published by Elsevier
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  • 6
    Publication Date: 1975-10-01
    Print ISSN: 0001-5970
    Electronic ISSN: 1619-6937
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Published by Springer
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  • 7
    Publication Date: 1977-11-01
    Print ISSN: 0044-2275
    Electronic ISSN: 1420-9039
    Topics: Mathematics , Physics
    Published by Springer
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  • 8
    Publication Date: 1977-12-28
    Print ISSN: 0022-3719
    Topics: Physics
    Published by Institute of Physics
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