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  • 1965-1969  (2)
  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Electrical engineering 51 (1967), S. 155-175 
    ISSN: 1432-0487
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology
    Description / Table of Contents: Contents The iron core of an arrangement of windings influences often determining the magnetic field and in consequence of that the impressed forces, the eddy-current losses and so on. This effect on the iron core is dealt with in the present paper as an axially symmetrical problem. It is recognized there, that the core can be substituted by a current coverage on its surface with regard to its index of refraction. The influence of the infinite tall circular cylindrical iron core is identical with the magnetic flux of the current coverage field. For these solutions it is only necessary to know the course of the tangential field intensity of the arrangement without iron on the interface. By the stated approximation of the exact solution the expenditure of the calculation can be essentially reduced. In connection with this solution the problem of the transformer with a random number of windings is dealt with.
    Notes: Übersicht Der Eisenkern einer Wicklungsanordnung beeinflußt das magnetische Feld und als Folge davon auch die eingeprägten Kräfte, die Wirbelstromverluste usw. oft maßgebend. Dieser Eisencinfluß wird in der vorliegenden Arbeit als rotationssymmetrisches Problem behandelt. Es wird dabei erkannt, daß sich der Kern in bezug auf seine Brechungseigenschaften durch einen Strombelag auf der Oberfläche ersetzen läßt. Der Einfluß des unendlich langen, kreiszylindrischen Eisenkernes ist damit identisch mit den Induktionen des Strombelagfeldes. Für die Lösungen ist nur der Verlauf der Tangentialfeldstärke der Luftanordnung auf der Grenzschicht erforderlich. Durch die angegebene Näherung der exakten Lösung läßt sich der Rechenaufwand wesentlich vermindern. Im Zusammenhan mit dieser Lösung wird das Problem des Mehrwicklungstransformators behandelt.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 0003-276X
    Keywords: Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Medicine
    Notes: The distribution of acid hydrolytic activities in rat uterine epithelial cells during post-partum involution was examined by light and electron microscopic cytochemistry. Acid phosphatase, β-glucuronidase, N-acetyl-β-glucosaminidase and E600-resistant esterase (cathepsin) increased during the period of involution and the electron cytochemical preparations revealed the lysosomal nature of the acid hydrolytic positive particles visualized by light microscopy.The newly formed particles included primary lysosomes, in the form of Golgi vesicles, vacuoles, and secondary lysosomes such as dense bodies and autophagic vacuoles. This apparent increase in lysosomal activity during uterine involution is in agreement with similar patterns observed in the course of tissue regression in general.
    Type of Medium: Electronic Resource
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