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  • 1980-1984  (3)
  • 1983  (3)
  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Archive of applied mechanics 53 (1983), S. 27-39 
    ISSN: 1432-0681
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Description / Table of Contents: Summary A theory of similarity is proposed which can be applied for many problems in continuum mechanics. Therefore the structure of frequently arising boundary value problems is analysed. It is outlined that solutions are similar for power-type material laws only. In this case simple design formulae can be developed. Especially the displacement of rigid foundations in sand can be described in a simple way by the theory of similarity assuming an appropriately formulated material law. The remaining unknown parameters can be determined in model tests. The constitutive relation chosen for sand is verified by special element tests. In addition the assumptions of the theory are checked in many model tests yielding good agreement.
    Notes: Übersicht Eine Ähnlichkeitstheorie wird vorgestellt, die bei vielen Fragestellungen in der Kontinuumsmechanik angewendet werden kann. Dazu wird die Bauart häufig auftretender Randwertprobleme untersucht. Es zeigt sich, daß nur bei Verwendung eines Stoffgesetzes vom Potenztyp die Lösungen für verschiedene Lastzustände ähnlich sind. In diesem Falle können einfache Entwurfsformeln entwickelt werden. Insbesondere können die Verschiebungen starrer Gründungskörper in Sand unter Verwendung eines passend formulierten Stoffgesetzes auf einfache Weise beschrieben werden. Die verbleibenden Unbekannten können aus Modellversuchen gewonnen werden. Das gewählte Stoffgesetz für Sand wird in speziellen Elementversuchen bestätigt. Darüber hinaus werden die Voraussetzungen für die Theorie in einer Vielzahl von Modellversuchen überprüft und ebenfalls bestätigt.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Archives of microbiology 136 (1983), S. 160-162 
    ISSN: 1432-072X
    Keywords: Methanobacterium thermoautotrophicum ; Aldolase ; Fructose 1,6-bisphosphatase ; Autotrophic ; Methanogen
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract In Methanobacterium thermoautotrophicum fructose 1,6-bisphosphate aldolase and fructose 1,6-bisphosphate phosphatase were studied, which could not be detected in previous investigations. Aldolase appeared to be a class I enzyme. Enzyme activity was only detectable in direction of aldol condensation in presence of Mg2+ and under anaerobic conditions. It was stimulated by dithioerythritol. The regulatory properties of the hexose bisphosphate phosphatase differed in many ways from those of the enzyme from other organisms.
    Type of Medium: Electronic Resource
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  • 3
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The analysis of charge state distributions after the interaction of fast Li- and N-ions with a surface at grazing incidence at energies between 50 and 350 keV yields for Li a strongly suppressed and for N an enhanced fraction of neutrals in comparison to the beam-foil interaction. These findings are supported by corresponding alkali-spectra which are dominated by lines from transitions in singly ionized atoms. The experiments are consistently interpreted in terms of a two step model: (1) collisional excitation in the close vicinity of the surface and (2) modification of this population by resonant electron transfer from (to) non localized states in the conduction (valence) band to (from) the ion. The model is also applied to interpret recent beam-foil experiments where preferential populations of Rydberg levels in highly ionized atoms were found.
    Type of Medium: Electronic Resource
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