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  • Concentration quenching  (1)
  • Industrial Chemistry  (1)
  • Wiley-Blackwell  (2)
  • Oxford University Press
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  • Wiley-Blackwell  (2)
  • Oxford University Press
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  • 1
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Chemie Ingenieur Technik - CIT 44 (1972), S. 1309-1312 
    ISSN: 0009-286X
    Keywords: Chemistry ; Industrial Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Es werden Meßergebnisse der scheinbaren radialen Wärmeleitzahlen mitgeteilt. Ausgehend von differenziellen Wärmebilanzen werden mathematische Zusammenhänge entwickelt, aus denen in Zusammenhang mit den experimentellen Ergebnissen hervorgeht, daß die scheinbare Wärmeleitzahl in radialer Richtung einer gasdurchströmten Schüttung in erster Näherung eine Funktion der Massenstromdichten sowie der spezifischen Wärme des Gases darstellt. Die Wärmeleitzahlen wurden aus an einer Versuchsanlage mit 80 mm lichter Weite und ca. 1800 mm Länge gemessenen Temperatur-Quer- und Längs-Profilen errechnet. Die Versuche wurden für Wärmestrom-richtung von innen nach außen und umgekehrt durchgeführt und die Ergebnisse an einem Rohr mit kleinem Durchmesser überprüft.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    New York, NY [u.a.] : Wiley-Blackwell
    Advanced Materials for Optics and Electronics 3 (1994), S. 131-136 
    ISSN: 1057-9257
    Keywords: II-VI compound ; SrS : Ce ; Photoluminescence ; Concentration quenching ; Phosphorescence ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: The luminescence efficiency of SrS: Ce powders in the doping range from 0.01 to 1.0 at.% was investigated by photoluminescence decay studies. The radiative decay time of Ce3+ in SrS was determined to be 27 ns. The onset of concentration quenching at concentrations higher than about 0.7 at.% has been obtained. The photoluminescence spectrum of Ce3+ exhibits two emission bands as a consequence of the ground state splitting. The Huang-Rhys factor of the 5d-4f transition was estimated to be about 6. The inhomogeneous broadening of the emission band of samples with higher doping level has been investigated by site-selective and time-resolved spectroscopy.
    Additional Material: 9 Ill.
    Type of Medium: Electronic Resource
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