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  • 1
    Electronic Resource
    Electronic Resource
    The role of chaotic orbits in the determination of power spectra of passive scalars (1996)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Fluids 8 (1996), S. 3094-3104 
    Details
    ISSN: 1089-7666
    Source: AIP Digital Archive
    Topics: Physics
    Notes: This paper relates properties of the power spectrum of a passive scalar convected by a chaotic fluid flow to the distribution of finite time Lyapunov exponents. The properties considered include the early time evolution of the power spectrum, the late time exponential decay of the scalar variance, and the wave number dependence of the power spectrum in the presence of a source of scalar variance. Theoretical predictions are tested by comparing full numerical solutions of the relevant partial differential equation to solutions of a model system which includes diffusion and involves integrations along the fluid orbits only. The model system is shown to give results in close agreement with the numerical solutions of the full problem. This suggests the possible general utility of the model equations for a broad range of problems involving passive scalar convection. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.869083
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  • 2
    Electronic Resource
    Electronic Resource
    Preparation of Photocatalytic Nanostructured TiO〈sub〉2〈/sub〉 Thin Films (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 587-588 (June 2008), p. 795-799 
    Details
    ISSN: 1662-9752
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Photoactive films consisting of pure anatase, brookite or rutile were deposited on glassslides by a dip coating process from water dispersions or solutions obtained by using TiCl4 as theprecursor. The films were characterized by X-ray diffraction, scanning electron microscopy andatomic force microscopy. The photocatalytic activity of the various samples was evaluated by usingthe photooxidation of 2-propanol in gas solid regime as probe reaction. Brookite and anatase filmsshowed a good photoactivity degrading the substrate and the propanone produced during thereaction
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/19/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.587-588.795.pdf
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