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  • 1
    Electronic Resource
    Electronic Resource
    Valence-band effective masses of GaAs (1988)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 64 (1988), S. 447-450 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The density-of-states effective masses for the heavy-hole, light-hole, and split-off valence bands of GaAs have been calculated as a function of energy for each band. The calculations are based on a full k⋅p theory with the most recent values used for the matrix elements. Provision has been made for the effect of the split-off energy on the matrix elements of the split-off band. The results show important nonparabolicities which should be taken into account in modeling the valence band, and rational polynomial fits have been made for ease of computation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.341217
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Boundary integral equation methods for two-dimensional models of crack-field interactions (1988)
    Springer
    Journal of nondestructive evaluation 7 (1988), S. 3-14 
    Details
    ISSN: 1573-4862
    Keywords: Electromagnetic nondestructive evaluation (NDE) ; crack detection ; eddy currents ; boundary integral equations ; boundary element method
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Mathematics
    Notes: Abstract An introduction to the application of surface integral equation methods to the calculation of eddy current-flaw interactions is presented. Two two-dimensional problems are presented which are solved by the boundary integral equation method. Application of collocation methods reduces the problems to systems of linear algebraic equations. The first problem is that of a closed surface crack in a flat slab with an AC magnetic field parallel to the plane of the crack. The second is that of av-groove crack in the AC field of a pair of parallel wires placed parallel to the vertex of the crack. In both cases, maps of the current densities at the surface are displayed, as well as the impedance changes due to the cracks.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00565772
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Reconstructing electrical conductivity profiles from variable-frequency eddy current measurements (1989)
    Springer
    Research in nondestructive evaluation 1 (1989), S. 167-179 
    Details
    ISSN: 1432-2110
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract A method for reconstructing radially varying conductivity profiles in cylindrical conductors is described. Solenoidal driving and sensing coils surround the cylindrical sample and an AC magnetic field applied by the driving solenoid induces axisymmetric eddy currents in the sample. It is shown how a radially varying conductivity profile can be recovered from measurements of the complex impedance recorded as a function of frequency, where impedance here is defined as the ratio of the induced electromotive force (EMF) in the sensing coil to the current in the driving coil. An iterative nonlinear least-squares algorithm is employed to reconstruct the profiles. Demonstrations of the reconstruction method are presented based on both simulated and experimentally recorded impedance data.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01606513
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    Paper (German National Licenses)
    Fulltext
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