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  • Artikel: DFG Deutsche Nationallizenzen  (5)
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  • Artikel: DFG Deutsche Nationallizenzen  (5)
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  • 1
    Digitale Medien
    Digitale Medien
    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
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: 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.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.341217
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  • 2
    Digitale Medien
    Digitale Medien
    Isomorphous heteropoly complexes containing various pairs of paramagnetic atoms. Exchange-coupled differing spins with absence of long-range magnetic interactions. New class of paramagnetic behavior. Theoretical treatment. Novel geometrical isomerism (1972)
    s.l. : American Chemical Society
    Journal of the American Chemical Society 94 (1972), S. 5499-5501 
    Details
    ISSN: 1520-5126
    Quelle: ACS Legacy Archives
    Thema: Chemie und Pharmazie
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1021/ja00770a057
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  • 3
    Digitale Medien
    Digitale Medien
    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
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Maschinenbau
    Notizen: 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.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01606513
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  • 4
    Digitale Medien
    Digitale Medien
    Development in the theory and analysis of eddy current sensing of velocity in liquid metals (1992)
    Springer
    Research in nondestructive evaluation 4 (1992), S. 237-248 
    Details
    ISSN: 1432-2110
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Maschinenbau
    Notizen: Abstract We have performed a theoretical study of the magnetic fields produced by a single turn ac coil encircling a moving conductive rod or tube of flowing liquid metal. A solution exact to first order in the velocity has been obtained as a closed-form integral. Radial variation of the velocity profile is included. The solution allows a calculation of the voltages induced in two secondary coils wired in opposition for application as a velocimeter. With secondary coils wired in series, the calculation provides the classical impedance vs. frequency curves which allow determination of sample conductivity and diameter. The solution has been used to optimize design for a sensor to be used for monitoring speed and tube bore diameter in a liquid metal atomizer system. An additional solution has been obtained for arbitrary magnitude of velocity, but for constant velocity profile.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01616490
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  • 5
    Digitale Medien
    Digitale Medien
    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
    Schlagwort(e): Electromagnetic nondestructive evaluation (NDE) ; crack detection ; eddy currents ; boundary integral equations ; boundary element method
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Elektrotechnik, Elektronik, Nachrichtentechnik , Mathematik
    Notizen: 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.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00565772
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