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Elektronische Veröffentlichungen der Universitätsbibliothek Wuppertal
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  • Problemlösen, Heuristik und Geometrie: Zwei Konzepte für einen neuen Mathematikunterricht der Orientierungsstufe, A

    Krichel, Katharina (2018)
    Band B der zweibändigen Arbeit wendet sich der besonderen Beziehung zwischen Mathematik und Heuristik zu, die eine tragende Grundlage für den Mathematikunterricht von Übermorgen sein könnte: In Teil I wird die Geschichte der Didaktik, mit geschärftem Blick auf nicht-fachgebundene Unterrichtsformen einerseits und die Rolle des Problemlösens und seiner Berücksichtigung im Mathematikunterricht andererseits, in ihren wichtigsten Entwicklungsschritten nachgezeichnet. Nachdem zunächst Grundbegr...

    Deflation Based Krylov Subspace Methods for Sequences of Linear Systems

    Božović, Nemanja (2017)
    Many problems in engineering, numerical simulations in physics etc. require the solution of long sequences of slowly changing linear systems. As an alternative to GCRO-DR and Loose GCRO-DR, we propose two algorithms, LRDGMRES and Loose LRDGMRES, that use an oblique projection in the spirit of truly deflated GMRES for deflating the eigenvalues of smallest magnitude. This oblique projection requires approximations to right and left eigenvectors, and we proposed a way of getting the approximatio...

    Neue Synthesewege zur Darstellung wasserlöslicher sulfonierter Phosphane

    Kühnel, Michael (2002)
    In the first section of this work the influence of a SO3M moiety on the Pd-catalysed P-C cross coupling reaction was examined. The reaction of PhPH2, Ph2PH and BnPH2 with 1, 1a and L11 under comparable conditions is strongly influenced by the catalyst e. g. Pd(OAc)2, [Pd(PPh3)4] or Pd2(dba)3/dppp (1:1) and the solvent used. In agreement with the generally accepted catalytic cycle for the Pd(0)-assisted P-C cross coupling reaction, the reaction rate is dependent on the ...
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