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  • 1
    Electronic Resource
    Electronic Resource
    Hoboken, NJ : Wiley-Blackwell
    AIChE Journal 38 (1992), S. 1013-1026 
    ISSN: 0001-1541
    Keywords: Chemistry ; Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Gas-phase backmixing and holdup for the air-water system were measured in 0.15- and 0.25-m-dia. bubble columns. Novel experimental and analytical techniques were used to analyze the gas-phase residence time distribution. A Levenberg-Marquardt-type optimization scheme was used to obtain the two reactor model parameters: Peclet and Stanton numbers. Operating variables included the column diameter and the superficial gas- and liquid-phase velocities.A two-bubble-class hydrodynamic model has been proposed to predict the gas-phase backmixing in bubble column reactors. The model assumes a bimodal distribution of the gas phase with large bubbles flowing in a plug-flow manner and the small bubbles partially backmixed. The model only needs easily measurable parameters and has been validated by comparing experimental as well as literature data on gas-phase backmixing with the model predictions. The model is more realistic than the conventional single-bubble-class model and provides a rational approach to predict the gas-phase backmixing in scaling-up bubble-column reactors.
    Additional Material: 16 Ill.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Angewandte Makromolekulare Chemie 7 (1969), S. 85-100 
    ISSN: 0003-3146
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: Polyester- und Polyamid-Garn wurden in Gegenwart von Chemikalien wie Ammoniak, Chlor, Methylmethacrylat, Vinylacetat und Acrylnitril mit kontrollierten Dosen von γ-Strahlen bestrahlt. Die physikochemischen sowie mechanischen Eigenschaften der bestrahlten Garne wurden untersucht. Die Ergebnisse zeigen, daß durch Bestrahlung in Gegenwart dieser Chemikalien merkliche Verbesserungen einiger wünschenswerter Fasereigenschaften möglich sind.
    Notes: Polyester and polyamide yarns have been irradiated under controlled doses of γ-rays in presence of chemicals like gaseous ammonia and chlorine as also methyl methacrylate, vinyl acetate, and acrylonitrile monomers. The irradiated monomers have been tested for some of the more important physico-chemical and mechanical properties. The results indicate that the improvements obtained in various desirable properties are of much higher order when irradiation is carried out in presence of the chemicals employed.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Angewandte Makromolekulare Chemie 6 (1969), S. 127-135 
    ISSN: 0003-3146
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: Es wurde die Einwirkung von γ-Strahlen auf Polyester- und Polyamid-Garn in verschiedenen Dosen in Gegenwart sowie unter Ausschluß von Luft untersucht. Die Veränderung in den Fasereigenschaften wie Schmelzpunkt, relative Viscosität, Festigkeit und Farbstoffaufnahme wurde ermittelt. Die in dieser Arbeit gefundenen Ergebnisse zeigen, daß - obwohl mit höheren Strahlungsdosen die Faserstoffe beschädigt wurden - es mit kontrollierter Bestrahlung jedoch möglich ist, einige Fasereigenschaften ohne wesentlichen Faserabbau zu verbessern.
    Notes: Polyester and polyamide yarns have been exposed to γ-rays with varying doses of irradiation, both in vacuum and in the presence of air. The changes in such properties of the polymers as melting point, relative viscosity, tensile strength, and dye absorption have been investigated. The results of the present study indicate that, though with higher doses there is degradation of the polymer, under controlled conditions certain desirable properties of the fibre are greatly improved without affecting the mechanical strength.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Angewandte Makromolekulare Chemie 8 (1969), S. 117-132 
    ISSN: 0003-3146
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: Es wurde die Einwirkung von γ-Strahlung auf die elektrostatischen Eigenschaften von synthetischen Fasern untersucht. Elektronenmikroskopische Aufnahmen wurden benutzt, um die Veränderungen auf der Faseroberfläche nach dem Bestrahlen zu erkennen. Die Ergebnisse zeigen, daß man unter optimalen Bestrahlungsbedingungen den synthetischen Fasern antistatische Eigenschaften ohne Veränderungen in anderen wünschenswerten Fasereigenschaften verleihen könnte.
    Notes: The effect of irradiation on the electrical properties of the synthetic fibres has been studied. The electron photomicrographs have been taken to investigate the structural changes occuring due to irradiation on the surface of the yarn. The results indicate that under optimum conditions of irradiation antistatic properties could be imparted to synthetic fibres without affecting the desirable properties.
    Additional Material: 12 Ill.
    Type of Medium: Electronic Resource
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