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  • 1965-1969  (6)
  • 1
    Electronic Resource
    Electronic Resource
    Springer
    The European physical journal 220 (1969), S. 199-204 
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract In the transition zone between phases of different conduction types, the electrical current is not only unevenly distributed, but also, in many cases, local or temporal instabilities occur. Most of these effects have already been observed, but until now, no theoretical treatment has been published. As a straightforward extension of the linear mathematical treatment of the current distribution in porous electrodes1, an explanation of two classes of purely electrical instabilities can be given. Beyond these purely electrical instabilities, a number of more complicated cases has to be considered. These are local instabilities caused by overlapping singularities, e.g. spots of minor density or conductivity, local and temporal instabilities caused by thermal breakthroughs and instabilities caused by hydrodynamical eddies. Moreover the current distribution shows local and temporal fluctuations as the result of the granular structure of the transition zone.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Electrical engineering 51 (1966), S. 123-130 
    ISSN: 1432-0487
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology
    Description / Table of Contents: Summary By means of metallic probes, the local distribution of the internal resistance in galvanic cells is measured. The theoretical base of the new method is derived from the theory of current distribution. As exemple, measurements on dry cells (IEC: R20) are reported. Between carbon rod and manganese core, between core and electrolyte and on the zinc are border-resistances located. These resistances are measured quantitatively the first time. During discharge and during drying out, the border resistances are much more influenced than the resistance e.g. of the black mix. The electronic conductivity of porous electrodes can be measured separated from the ionic parts by application of the new method.
    Notes: Übersicht Mit Hilfe einer Sondenmethode wird die örtliche Verteilung des Leitungswiderstandes in galvanischen Zellen ermittelt. Die Grundlagen für die Sondenmethode werden aus der Theorie der Stromverteilung abgeleitet. An Trockenzellen (IEC: R20) werden Messungen durchgeführt und die Ergebnisse mitgeteilt. Am Stift, am Außenrand der Puppe und am Zink treten Grenzflächenwiderstände auf, die hier zum ersten Mal quantitativ gemessen werden. Die Entladung, ebenso wie das Austrocknen der Zellen, wirken besonders stark auf die Grenzflächenwiderstände. Die neue Methode erlaubt die getrennte Messung des Elektronenanteils der Leitfähigkeit in der porösen positiven Elektrode.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für die chemische Industrie 81 (1969), S. 755-756 
    ISSN: 0044-8249
    Keywords: Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Chemie Ingenieur Technik - CIT 38 (1966), S. 154-159 
    ISSN: 0009-286X
    Keywords: Chemistry ; Industrial Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: In der optischen Pyrometrie ermittelt man im allgemeinen die schwarze Temperatur, die ziemlich weit unterhalb der wahren Temperatur liegt. Folgende Verfahren werden besprochen, mit denen man unmittelbar die wahre Temperatur messen kann: photoelektrische Messung der Farbtemperatur, Polarisations-Pyrometrie unter geneigter Beobachtungsrichtung und Emissionsausgleich durch Aufprojektion.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Chemie Ingenieur Technik - CIT 41 (1969), S. 40-50 
    ISSN: 0009-286X
    Keywords: Chemistry ; Industrial Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Viele der modernen Verfahren zur statischen Erzeugung von Elektrizität werden in ihrer technischen Entwicklung entscheidend durch Werkstoffprobleme aufgehalten, die im Bereich hoher Temperaturen auftreten. Für galvanische Brennstoffzellen untersucht man Elektrolyte aus schmelzflüssigen Alkalicarbonaten und aus festen Ionenleitern vom Typ der Nernst-Masse. In den thermionischen Konvertern werden Hochtemperatur-Metalle, meist Molybdän, Niob und Rhenium, als Elektroden verwendet. Als Isolatoren benutzt man reinen, dichten Sinterkorund. Besonders große Werkstoffschwierigkeiten ergeben sich bei den magneto-hydrodynamischen (MHD) Generatoren. Hier handelt es sich sowohl um die Elektroden und die isolierenden Wände in den eigentlichen MHD-Kanälen als auch um die Luftvorwärmer.
    Additional Material: 19 Ill.
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Angewandte Chemie International Edition in English 8 (1969), S. 779-779 
    ISSN: 0570-0833
    Keywords: Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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