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  • 1
    Electronic Resource
    Electronic Resource
    Correlations between microstructure and a.c. magnetic response of bulk superconducting YBa2Cu3O7−x (1995)
    Springer
    Il nuovo cimento della Società Italiana di Fisica 17 (1995), S. 381-391 
    Details
    ISSN: 0392-6737
    Keywords: Superconducting materials ; General properties ; Critical currents
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Summary The magnetic response of granular superconducting YBCO samples with different grain sizes is reported. The analysis is carried out by measuring the low-frequency a.c. magnetic susceptibility as a function of the temperature with an applied magnetic field of amplitude ranging between 0.4 and 800 A/m. The observed magnetic behaviour is interpreted in terms of grain size and weak-links properties. The experimental results evidence the influence of the sample microstructure on the magnetic susceptibility. The intergranular and intragranular onset temperatures are compared with the critical temperature of the samples obtained by means of electrical-resistivity measurements. The temperature dependence of the intergranular critical current density is derived from the susceptibility data.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02457340
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Mixed convection in a porous medium produced by a line heat source (1995)
    Springer
    Transport in porous media 18 (1995), S. 1-13 
    Details
    ISSN: 1573-1634
    Keywords: Mixed convection ; thermal plume ; line source ; porous media
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Technology
    Notes: Abstract A boundary-layer analysis is presented for the mixed convection flow which is produced when a horizontal line heat source, which is embedded in an infinite fluid-saturated porous medium, generates heat at a constant rate. It is shown that the governing equations can be non-dimensionalized so that they do not involve any parameters and thus just one solution of the transformed boundary-layer equations is required. Series solutions which are valid both near the line source and far downstream are obtained and compared with the numerical solution of the full boundary-layer equations.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00620657
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
    Fulltext
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