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  • 1970-1974  (7)
  • 1965-1969
  • 1974  (7)
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  • 1970-1974  (7)
  • 1965-1969
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  • 1
    facet.materialart.
    Unbekannt
    Terry Otten, The Deserted Stage (Book Review) (1974)
    Philadelphia, Pa. : Periodicals Archive Online (PAO)
    The Wordsworth circle. 5:3 (1974:Summer) 197 
    Details
    ISSN: 0043-8006
    Thema: Anglistik, Amerikanistik
    URL: http://gateway.proquest.com/openurl?url_ver=Z39.88-2004&res_dat=xri:pao:&rft_dat=xri:pao:article:h340-1974-005-03-000027
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  • 2
    Digitale Medien
    Digitale Medien
    Estimating the relative toxicologic potential of each pesticide in a mixture of residues on foliage (1974)
    Springer
    Bulletin of environmental contamination and toxicology 12 (1974), S. 682-686 
    Details
    ISSN: 1432-0800
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Energietechnik , Medizin
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01685914
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  • 3
    Digitale Medien
    Digitale Medien
    Filamentary sapphire (1974)
    Springer
    Journal of materials science 9 (1974), S. 323-328 
    Details
    ISSN: 1573-4803
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Maschinenbau
    Notizen: Abstract The “edge-defined, film-fed growth” (EFG) technique was employed to grow filamentary sapphire from the melt using tungsten orifices at speeds up to 25 cm/min. Filament growth was recorded using 16 mm motion picture photography and samples grown were examined by means of transmitted light and scanning electron microscopy. Evidence for the dendritic nature of growth at speeds in excess of 10 cm/min is presented. Details of the liquid/solid growth interface are reported, indicating the increasingly dendritic character of propagation with increasing speed, and suggesting that a minimum of two related dendrites are required for stable growth. The pulsating quality of growth at high speeds is discussed in terms of a need to dissipate heat of solidification and the effect of this dissipation on the supercooled liquid into which the dendrites extend. Other growth characteristics, including the 0.020 cm high growth film from which the 0.024 cm diameter filament is withdrawn and the defect microstructure of the solid filament are discussed.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00550958
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  • 4
    Digitale Medien
    Digitale Medien
    Fracture strength in tension of a-axis filamentary sapphire grown by EFG (1974)
    Springer
    Journal of materials science 9 (1974), S. 510-512 
    Details
    ISSN: 1573-4803
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Maschinenbau
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00737858
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  • 5
    Digitale Medien
    Digitale Medien
    Immobilized enzyme catalysis with reaction-generated pH change (1974)
    New York, NY [u.a.] : Wiley-Blackwell
    Biotechnology and Bioengineering 16 (1974), S. 1345-1357 
    Details
    ISSN: 0006-3592
    Schlagwort(e): Chemistry ; Biochemistry and Biotechnology
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Biologie , Werkstoffwissenschaften, Fertigungsverfahren, Fertigung
    Notizen: Many enzyme-catalyzed reactions involve the liberation or consumption of hydrogen ions. In this paper a mathematical model is employed to investigate how such reactions behave when the enzyme is immobilized. Shifted pH optima, disappearance of an optimum pH, insensitivity to bulk pH, and very large effectiveness factors are some of the phenomena which appear as a result of pH coupling between the reaction and the enzyme's activity. Several of the qualitative features revealed by the model are consistent with earlier experimental observations. In addition, preliminary guidelines for optimal choice of enzyme support are suggested.
    Zusätzliches Material: 5 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/bit.260161004
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  • 6
    Digitale Medien
    Digitale Medien
    Influence of mixing on the performance of periodic chemical reactors (1974)
    Hoboken, NJ : Wiley-Blackwell
    AIChE Journal 20 (1974), S. 74-81 
    Details
    ISSN: 0001-1541
    Schlagwort(e): Chemistry ; Chemical Engineering
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie , Werkstoffwissenschaften, Fertigungsverfahren, Fertigung
    Notizen: The interaction between imperfect mixing and cyclic operation is examined for several continuous polymerizations in stirred-tank reactors. The reactor is represented by a mixed model involving two interconnected ideal stirred vessels. Cyclic fluctuations in the concentration of a chain transfer agent during Ziegler-catalyzed olefin polymerization can yield molecular weight distributions significantly different from those of a conventional steady state reactor. This result is consistent with the available experimental data. It is especially interesting that the cyclic reactor effluent with a modified molecular weight distribution is of approximately time-invariant composition when the period of cycling is on the order of the reactor holding time. Imperfect mixing has a lesser effect on cycled reactors for free-radical and polycondensation polymerization than it has on cycled olefin polymerization reactors.
    Zusätzliches Material: 5 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/aic.690200109
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  • 7
    Digitale Medien
    Digitale Medien
    Regulation of lumped periodic processes (1974)
    Hoboken, NJ : Wiley-Blackwell
    AIChE Journal 20 (1974), S. 924-932 
    Details
    ISSN: 0001-1541
    Schlagwort(e): Chemistry ; Chemical Engineering
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie , Werkstoffwissenschaften, Fertigungsverfahren, Fertigung
    Notizen: When a periodic process is disturbed, control action may be necessary to maintain satisfactory performance. Regulating controls to achieve this objective can be synthesized by solving a linear-quadratic optimization problem with periodic coefficient's. Generalized proportional and proportional-integral feedback regulators developed in this manner are tested by simulating a cyclic reactor. Very satisfactory control is achieved for 10% step disturbances in reactor feed conditions although the results are sensitive to the choice of manipulated variables.
    Zusätzliches Material: 6 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/aic.690200513
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