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  • 1980-1984
  • 1975-1979  (4)
  • 1950-1954
  • 1979  (4)
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  • 1980-1984
  • 1975-1979  (4)
  • 1950-1954
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  • 1
    Electronic Resource
    Electronic Resource
    Stresses from arbitrary loads on a circular crack (1979)
    Springer
    International journal of fracture 15 (1979), S. 85-104 
    Details
    ISSN: 1573-2673
    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: Résumé On développe une théorie inclusive pour l'étude des déplacements associés à des charges distribuées de façon arbitraire normalement et tangentiellement sur une fissure circulaire dans un corps infini. La représentation choisie pour les conditions aux limites conduit à des solutions exprimées sous forme d'intégrales de fonction de Bessel d'une classe qui se prète à des analyses subséquentes et à une évaluation rapide par des calculatrices modernes. Les coefficients de charge qui apparaissent dans toutes les séries de solution permettent une interprétation compréhensible, et les facteurs d'intensité de contraintes y sont reliés par des formules simples. Les caractéristiques de ces solutions qualifient cette théorie pour un usage utile à l'analyse de fissures dans les corps finis pour lesquels les charges effectives appliquées aux fissures peuvent présenter diverses configurations.
    Notes: Abstract An inclusive theory is developed for stresses and displacements due to arbitrarily distributed normal and tangential loads acting on a circular crack in an infinite body. The representation chosen for the boundary conditions leads to solutions expressed as series of Bessel-function integrals of a class quite susceptible to further analysis and to rapid evaluation on modern computers. The load coefficients which appear in all the solution series bear intelligible interpretation, and stress intensity factors are related to them by simple formulas. The inclusiveness and tractability of the solutions qualify this theory to be a useful part of analyses for cracks in finite bodies in which the effective crack loads can assume many patterns.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00115911
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    JWKB connection for radial wave functions and bound-state/free-state duality (1979)
    Springer
    The European physical journal 2 (1979), S. 183-185 
    Details
    ISSN: 1434-6052
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The oscillatory and non-oscillatory regions of radial wave functions are connected by the use of spherical Bessel functions or Coulomb wave functions. The resulting formulae for the magnitude of the wave function at the origin in terms of the energy spectrum are used to exhibit the appropriate form of boundstate/free-state duality.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01474132
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    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    The use of EEG theata biofeedback in the treatment of a patient with sleep-onset insomnia (1979)
    Springer
    Applied psychophysiology and biofeedback 4 (1979), S. 229-236 
    Details
    ISSN: 1573-3270
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract In this report, the treatment of a 42-year-old female with a complaint of chronic sleep-onset insomnia is described. Following the unsuccessful use of relaxation training, treatment consisted of 11 sessions of EEG theta rhythm (4–7 Hz) biofeedback. Theta density and five sleep indices were monitored throughout baseline, placebo, and treatment sessions. A significant increase in theta density was accompanied by reports of a decrease in sleep latency and an increase in total sleep time. This improvement was maintained after withdrawal of medication and at 3-month follow-up.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00998824
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Aspects of the yield behavior in poly(ethylene terephthalate) fibers (1979)
    Stamford, Conn. [u.a.] : Wiley-Blackwell
    Polymer Engineering and Science 19 (1979), S. 18-23 
    Details
    ISSN: 0032-3888
    Keywords: Chemistry ; Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: The yield behavior during cold drawing of commercially spun poly(ethylene terephthalate) (PET) filament yarn was investigated. Microscopic examination revealed the presence of inherent flaws within the spun filaments; these act as points for localized stress concentration. These inhomogeneities appear to be either internal cracks or crazes developed during the fiber melt spinning process. During elongation, stress magnification at these flaws results in shear band formation, indicating the onset of inhomogeneous yielding. At the yield bend in the load-elongation curve a circumferential crack propagates within these shear band regions. This yield crack develops into the classical neck geometry which further localizes additional plastic deformation within the sample at the neck.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pen.760190104
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    Paper (German National Licenses)
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