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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Applied physics 54 (1992), S. 6-18 
    ISSN: 1432-0630
    Keywords: 44.30 ; 81.70
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract The thermal diffusion process is examined for a porous sample with idealized arrangement and form of the pores, when its surface is illuminated by a modulated light. A formula for the frequency dependence of the average surface temperature is derived. It is shown that it depends on the porosity, the form of the pores, and the ratio between a characteristic pore size and the thermal wavelength. In the limiting cases of low frequency of modulation and low porosity the results agree well with those quoted in the literature. The frequency dependence of the surface temperature of a microporous rubber sample, glass filtering crucibles, and leather samples have been measured by a PA cell and compared with the analytical results. The influence of various processes on the heat diffusion in porous media is discussed.
    Type of Medium: Electronic Resource
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  • 2
    Publication Date: 2019-04-30
    Type: Dataset
    Format: text/tab-separated-values, 89 data points
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  • 3
    Electronic Resource
    Electronic Resource
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 75 (1999), S. 3908-3910 
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A tightly focused laser beam is shown to act as a scatterer of surface plasmons. The energy released into free space due to the scattering is collected by far-field optics. Scanning the laser beam over the plasmon field gives a map of their propagation. Evidence is given which shows that the surface-plasmon map gives much more detail of plasmon propagation and film structure than the photothermal image, which monitors the heat deposited during plasmon propagation. © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 83 (1998), S. 1878-1883 
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A new method for deriving the one-dimensional temperature distribution in a highly absorbing solid with continuously varying parameters is proposed. This method is based on a Riccati first-order ordinary differential equation and assumes sinusoidally modulated surface heating. Numerical solutions for several thermal conductivity profiles are compared with data obtained from models that approximate the original profiles with steplike variation of the thermal conductivity. A fast real-time inversion procedure is proposed to reconstruct the thermal conductivity profile from surface temperature data. It is based on the step-by-step reconstruction of this profile by sweeping the modulation frequency of the heating beam. The algorithm uses data from previous, higher frequencies to find the next optimum frequency. The measurements and the profile reconstruction are performed simultaneously. This procedure is tested for different profiles, including some with complex behavior and is found to be stable and reliable. Some limitations concerning the profile of the thermal conductivity are discussed. © 1998 American Institute of Physics.
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Amsterdam : Elsevier
    Solid State Communications 91 (1994), S. 49-53 
    ISSN: 0038-1098
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Physics
    Type of Medium: Electronic Resource
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  • 6
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A theoretical and experimental study of the influence of planar thermal barriers on photothermal reflectance microscopy signals is presented. An analytical solution is developed for the problem of vertical barriers in a semi-infinite solid and the signal contrast obtained when scanning through the barrier is discussed as a function of the thermal resistance, the thermal diffusion length, and the pump and probe beam dimensions. The shape and the width of the signal perturbation introduced by the barrier is also analyzed. For the case of slanted barriers results of finite-element calculations are presented, and the main feature of the signal when going from vertical to slanted barriers is thus shown. Finally, the theoretical predictions are compared with measurements made on Fe sintered samples. Scanning through grain interfaces revealed different signal shapes and contrast. Good agreement between theory and experiment was found when the optical contrast at the interface is negligible. Examples are shown where the thermal barrier model is no longer valid and an extended model seems to be necessary.
    Type of Medium: Electronic Resource
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