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  • 1985-1989  (3)
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  • 1
    ISSN: 1520-4995
    Source: ACS Legacy Archives
    Topics: Biology , Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Experiments in fluids 8 (1989), S. 199-208 
    ISSN: 1432-1114
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract A novel possibility to determine the temperature, density and velocity simultaneously in gas flows by measuring the average value, amplitude of modulation and phase shift of the photoluminescence excited by a temporally or spatially modulated light source is investigated. Time-dependent equations taking the flow, diffusion, excitation and decay into account are solved analytically. Different experimental arrangements are proposed. Measurements of velocity with two components, and temporal and spatial resolutions in the measurements are investigated. Numerical examples are given for N 2with biacetyl as the seed gas. Practical considerations for the measurements and the relation between this method and some existing methods of lifetime measurement are discussed.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Journal of materials science 24 (1989), S. 1827-1834 
    ISSN: 1573-4803
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract The microstructure variation ofβ-Al2O3 with different compositions during hot-pressing and its effect on ionic conductivity were studied. It is found that, besides the phase composition, the conductivity of hot-pressedβ-Al2O3 materials of the same composition is also related to the measurement direction, microstructure and density. The resistivity in the direction parallel to hot-pressing is about three times higher than that perpendicular to the hot pressing. The pores in the material are particularly detrimental to the ionic conduction. It was observed that the shape of complex impedance plane spectrum changed with measurement temperature and such change was affected by chemical composition and sample preparation condition. This phenomenon is explained successfully with the help of the ideal equivalent circuit of polycrystalline fast ionic conductor and the results of the conductivity measurement of hot-pressedβ-Al2O3.
    Type of Medium: Electronic Resource
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