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  • 1
    Electronic Resource
    Electronic Resource
    Amsterdam : Elsevier
    Biochimica et Biophysica Acta (BBA)/Bioenergetics 548 (1979), S. 139-146 
    ISSN: 0005-2728
    Keywords: (ESR) ; Antiferromagnetic exchange ; Ferredoxin ; Iron-sulfur protein ; Tetranuclear ferredoxins
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology , Chemistry and Pharmacology , Medicine , Physics
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Computing 28 (1982), S. 53-63 
    ISSN: 1436-5057
    Keywords: Polygonal domains ; singular expansion ; 65N30
    Source: Springer Online Journal Archives 1860-2000
    Topics: Computer Science
    Description / Table of Contents: Zusammenfassung Es wird eine Finite Elemente Methode zur Approximation elliptischer Differentialgleichungen auf Eckengebieten vorgeschlagen. Das Verfahren benutzt die Singulärfunktionen des Problems im Raum der Ansatzfunktionen und die Kernfunktionen des adjungierten Operators im Testraum. Dadurch erhält man gute Näherungen der Koeffizienten, der Singulärfunktionen. In einem numerischen Beispiel wird das Verfahren mit der bekannten Methode der Singulärfunktionen verglichen.
    Notes: Abstract A finite element method for approximating elliptic equations on domains with corners is proposed. The method makes use of the singular functions of the problem in the trial space and the kernel functions of the adjoint problem in the test space. This leads to good approximates of the coefficients of the singular functions. In the numerical computations, the method is compared with the well known Singular Function Method.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Numerische Mathematik 52 (1987), S. 539-564 
    ISSN: 0945-3245
    Keywords: AMS(OMS): 65N30, 65B05, 73K25 ; CR: G1.8
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Notes: Summary Standard finite element schemes applied to boundary value problems on domains with reentrant corners suffer from a global loss of accuracy caused by the influence of the corner singularities. For a model situation, it is shown that this pollution effect can be completely described in terms of an asymptotic error expansion with respect to fractional powers of the mesh size parameter. This provides the basis of an extrapolation procedure which recovers the full order of accuracy for the solution as well as for the corresponding stress intensity factors.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Springer
    Numerische Mathematik 49 (1986), S. 11-37 
    ISSN: 0945-3245
    Keywords: AMS(MOS):65N300 ; 65B05 ; CR: G1.8
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Notes: Summary The elliptic Ritz projection with linear finite elements is shown to admit asymptotic error expansions on certain uniform meshes. This justifies the application of Richardson extrapolation for increasing the accuracy.
    Type of Medium: Electronic Resource
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