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  • 1995-1999  (2)
  • 1965-1969  (2)
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  • 1
    Electronic Resource
    Electronic Resource
    Complex spatiotemporal convection patterns (1996)
    Woodbury, NY : American Institute of Physics (AIP)
    Chaos 6 (1996), S. 348-357 
    Details
    ISSN: 1089-7682
    Source: AIP Digital Archive
    Topics: Physics
    Notes: This paper reviews recent efforts to describe complex patterns in isotropic fluids (Rayleigh–Bénard convection) as well as in anisotropic liquid crystals (electro-hydrodynamic convection) when driven away from equilibrium. A numerical scheme for solving the full hydrodynamic equations is presented that allows surprisingly well for a detailed comparison with experiments. The approach can also be useful for a systematic construction of models (order parameter equations). © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.166194
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Convection Instabilities in Nematic Liquid Crystals (1995)
    Palo Alto, Calif. : Annual Reviews
    Annual Review of Fluid Mechanics 27 (1995), S. 515-539 
    Details
    ISSN: 0066-4189
    Source: Annual Reviews Electronic Back Volume Collection 1932-2001ff
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1146/annurev.fl.27.010195.002503
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Temperature and purity dependence of the nuclear-spin relaxation rate in the gapless region of type-II superconductors (1966)
    Springer
    The European physical journal 197 (1966), S. 46-57 
    Details
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The volume average of the nuclear-spin relaxation rate in type-II superconductors,R s, is calculated for magnetic fields slightly below the upper critical field and all mean free paths,l, and temperatures. It is found to be expressible solely in terms of the volume average of the density of states, $$\bar N(\omega )$$ , where the latter quantity has been determined recently byNeumann for alll. The derivation is based onHelfand andWerthamer's eigen-value equation for the order parameter,Δ. The deviation of $$\bar R_s $$ from the relaxation rate in the normal state,R n, is proportional to the quantity $$[|\overline {\Delta |^2 } /\Delta _{BCS}^2 (T)]R_n $$ (the bar denotes the spatial average). The proportionality factor is found to decrease monotonously as the temperature decreases and/orl increases. This behavior is closely related to the fact that $$\bar N(\omega )$$ shows no gap for the excitation energiesω and decreases asl increases, in particular at energiesω close to zero (ω=0 corresponds to the Fermi energy).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01333085
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Theory of the density of states of pure type-II superconductors in high magnetic fields (1967)
    Springer
    The European physical journal 201 (1967), S. 209-221 
    Details
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract This paper deals with the theory of the density of states of pure type-II superconductors in high magnetic fields. An approximate expression of theGreen's function is derived by using the fact that it has the periodicity of the lattice of flux lines in the center-of-mass coordinates. In comparison to the normal stateGreen's function a correction term proportional to the absolute square of the order parameter arises. This is seen to act as a self-energy part depending strongly on the polar angleΘ of the “quasiparticle” momentum relative to the direction of the field. The corresponding density of states, as a function of the excitation energy, is found to vary from the gapless to the BCS type as the parameterΘ changes fromπ/2 to zero (orπ). The averaged state density varies gradually from a uniform to a BCS-like state density as the external field decreases sufficiently far below the upper critical field. The results of the present theory for the averaged density of states agree fairly well with the results due to a conjecture byMaki if the field is very close to the upper critical field.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01326812
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    Paper (German National Licenses)
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