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  • Springer  (12)
  • 2020-2024
  • 1965-1969  (4)
  • 1960-1964  (8)
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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Electrical engineering 45 (1960), S. 59-76 
    ISSN: 1432-0487
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology
    Notes: Übersicht Auf einer Untersuchung von Meßergebnissen (des Erwärmungsverlaufs) sowie der wichtigsten Berechnungsmethoden der Enderwärmung elektrischer Maschinen aufbauend, wird eine allgemeine angenäherte Lösung des Problems an Hand der Methode der Wärmequellennetze aufgestellt. Es wird gezeigt, wie diese, praktischen Zwecken angemessen und unter einem Mindestmaß an Rechenarbeit ausgewertet werden kann; die Ausführungen werden sowohl durch praktisch erreichte Ergebnisse, als auch durch eine vollkommen durchgeführte Vorausberechnung des Erwärmungsverlaufs einer Maschine mit Meßergebnissen verglichen und einige Anmerkungen über die Anwendung von automatischen Rechengeräten ergänzt.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Electrical engineering 48 (1963), S. 1-6 
    ISSN: 1432-0487
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology
    Notes: Übersicht Es wird der Versuch unternommen nachzuweisen, daß es ganz allgemein möglich ist, den zeitveränderlichen Temperaturverlauf der elektrischen Maschine (eines beliebigen Körpersystems) mittels äquivalenter Wärmequellennetze beliebig genau zu approximieren.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Electrical engineering 49 (1964), S. 109-123 
    ISSN: 1432-0487
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology
    Description / Table of Contents: Summary The possibilities of constructing a heat-source network to represent a given many-body (transient) heat conduction problem with given accuracy are discussed. It is shown that in networks with an equal number of sources and bodies (called by us equivalent thermal ciscuits) the inner thermal resistance of the sources is time-dependent. On the basis of a profound analysis of these circumstances it occurs to be possible to replace the actual course of values by proper constant values without exceeding resonable limits of inaccuracy, though. This way the equivalent thermal network with constant resistances is proved to be an approximation of the many-body system and a practical way to contract it and to esteem possible errors etc. is given now.
    Notes: Übersicht Es werden die Möglichkeiten zu einem gegebenenn-Körperwärmeleitungsproblem ein Wärmequellennetz, das eine beliebige Approximation des Problems liefert, zu konstruieren, untersucht. Bei den Wärmequellennetzen mit gleicher Anzahl von Wärmequellen wie Körpern, die allein wir in Hinkunft „äquivalent” nennen wollen, tritt dabei bei dem inneren Wärmewiderstand der Quellen ein Widerstandsfaktor, der von der Zeit abhängig ist, auf. An Hand einer Abschätzung des Wertes den dieser Faktor annehmen kann, wird gezeigt, daß es bei annehmbarer Annäherung möglich ist, den tatsächlichen Wert der inneren Wärmewiderstände durch geeignete konstante Werte zu ersetzen. Damit erweist sich das äquivalente Netz mit konstanten Widerständen nicht nur als Approximation desn-Körperproblems, sondern es ergibt sich ein praktischer Weg zu dessen Konstruktion, zur Fehlerabschätzung, usw.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Springer
    Czechoslovak journal of physics 14 (1964), S. 34-43 
    ISSN: 1572-9486
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Measurements of the temperature and concentration dependence of the diffusion coefficient of divalent zinc were made to explain the mechanism of the process and to check the current theoretical conception. The measurements were executed on pure NaCl crystals. A knee in the curve of the logarithm of the diffusion coefficient versus the inverse temperature shows the diffusion is connected to two processes of different activation energy in accordance with the theoretical conception. The theoretically expected concentration dependence, however, has not been found, nor does the knee correspond to the expectations.
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Springer
    Czechoslovak journal of physics 17 (1967), S. 178-185 
    ISSN: 1572-9486
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Conductivity measurements were carried out on NaCl∶ NaOH and NaCl∶ Na2CO3. In both cases a decrease in conductivity with an increasing anion content and a conductivity minimum were found. In the case of NaCl∶ NaOH the conductivity of heavy doped crystals dropped even below the intrinsic conductivity value and conductivity hysteresis occurred.
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  • 6
    Electronic Resource
    Electronic Resource
    Springer
    Czechoslovak journal of physics 17 (1967), S. 786-797 
    ISSN: 1572-9486
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Conductivity and dielectric loss measurements were carried out on NaCl:CaCl2 + NaOH crystals. An evaluation of the experimental data, based on the assumption that a reaction takes place between the admixtures in the crystal which diminishes the number of charge carriers and complexes and leads to reaction yield and mass action constant values which are in good accord with theory. The results exclude any possibility of a mobility change.
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  • 7
    Electronic Resource
    Electronic Resource
    Springer
    Czechoslovak journal of physics 19 (1969), S. 689-696 
    ISSN: 1572-9486
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The measurements confirmed the association of Ca2+ and OH− in NaCl: CaCl2 + NaOH, which causes an increase and a shift +0·031 μ of the OH− absorption at 2·8μ, the extinction of the OH− UV-absorption at 184 nm and the occurrence of new absorption bands between 160 and 210 nm.
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  • 8
    Electronic Resource
    Electronic Resource
    Springer
    Czechoslovak journal of physics 14 (1964), S. 757-764 
    ISSN: 1572-9486
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract When studying the dielectric loss dependence of undoped (“pure”) and CaCl2 doped NaCl crystals on temperature and frequency, some further maxima were observed apart from the wellknown relaxation maxima of calcium complexes. The temperature of these maxima shifts with rising calcium content to lower temperatures (from 259 to 142°C), whereas the value of the maxima does not change with concentration and remains unchanged even with the purest crystals. It seems probable that the observed maxima are due to the relaxation loss of the crystal lattice itself.
    Type of Medium: Electronic Resource
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  • 9
    Electronic Resource
    Electronic Resource
    Springer
    Czechoslovak journal of physics 15 (1965), S. 407-411 
    ISSN: 1572-9486
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Relaxation maxima occurring at a frequency of 1 kHz above 100°C in pure LiF, KCl, NaCl and CaCl2-doped NaCl were investigated and an interesting fact, the dependence of the relaxational loss angle as well as the resp. dielectric constant on the sample thickness, was found and discussed.
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  • 10
    Publication Date: 1963-01-01
    Print ISSN: 0948-7921
    Electronic ISSN: 1432-0487
    Topics: Electrical Engineering, Measurement and Control Technology
    Published by Springer
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