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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Archiv der Mathematik 59 (1992), S. 157-164 
    ISSN: 1420-8938
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Archiv der Mathematik 70 (1998), S. 464-469 
    ISSN: 1420-8938
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Notes: Abstract. Recently B. Runge proved that the closure of the natural image of $ \Gamma _3(2,4) \backslash {\bf S}_3 $ in $ {\bf P}^7 $ by means of theta functions is a Baily-Borel embedding, i.e., that the image is normal. We show that this can be proved by using computer algebra algorithms, and this is carried out using the MACAULAY program. Also some other calculations are sketched which yield among other things the result that there are no cusp forms of weight $ \leq 6 $ for $ \Gamma _3(2,4) $ .
    Type of Medium: Electronic Resource
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  • 3
    ISSN: 1432-0584
    Keywords: Key words Autoimmune diseases ; Thrombocytopenia ; Platelet antibodies ; Autoimmune thrombocytopenic purpura ; AITP ; MAIPA assay
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract  Autoimmune thrombocytopenic purpura (AITP) is most frequently induced by platelet-specific autoantibodies against epitopes on platelet GP Ib/IX or GP IIb/IIIa. These antibodies are reliably detected on the patients' autologous platelets. So far, studies on the characterization of platelet autoantibodies have been restricted to IgG antibodies. We used the monoclonal antibody immobilization of platelet antigens assay (MAIPA) in a modified version to detect GP-specific IgG, IgM, and IgA antibodies. Platelets of 46.2% of patients carried elevated amounts of IgG antibodies. IgM and IgA antibodies were observed less frequently and showed only weak OD signals in the MAIPA assay. Circulating IgG antibodies in serum were found in 11.5% of patients. Circulating IgM autoantibodies were observed in 8.9% and IgA antibodies in no patient with AITP. Results of direct MAIPA assay were compared with the reactivity of eluates in the platelet adhesion immunofluorescence assay and were found to be highly concordant. Patients with AITP in remission carried high percentages of anti-GP IIb/IIIa. Findings made in this study suggest that autoantibodies of the IgM and IgA classes play only a minor role in the pathogenesis of AITP.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Springer
    Mathematische Annalen 258 (1982), S. 419-440 
    ISSN: 1432-1807
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Materialwissenschaft und Werkstofftechnik 28 (1997), S. 561-566 
    ISSN: 0933-5137
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Description / Table of Contents: Polymer Friction Models And Their Implementation Into Finite-Element-CodesIn order to support the development of seals and other frictioninvolved parts by numerical simulation methods an exact modeling of the frictional behavior is of essential importance. In case of polymeric materials the friction coefficient significantly depends on real contact area, contact stresses, relative sliding velocity and temperature. This cannot be described with the classical Coulomb-Friction-Model and advanced friction models are not commonly available in commercial FE-Codes. Therefore such advanced friction models have to be formulated and implemented by the users.In this article results of calculations with an implemented friction model are shown. Calculations of contact generation dependent on normal load are compared with the analytical results of the Hertzian Theory. Comparing the results of different FE-models the influence of discretisation is discussed. For verification purposes experimentally determined friction coefficients are listed.
    Notes: Bei der Entwicklung von dynamischen Dichtungen ist neben der Erfüllung der Dichtfunktion die Minimierung von Reibungsverlusten zu berücksichtigen. Moderne berechnungs- und simulationsunterstüzte Dichtungsentwicklungen müssen deshalb eine exakte Modellierung des Reibverhaltens integrieren. Im Fall der Polymerreibung zeigt der Reibkoeffizient signifikante Abhägigkeiten von Kontaktnormalspannung, relativer Gleitgeschwindigkeit und Temperatur. Diese Können mit dem klassischen Coulomb-Reibmodell nicht beschrieben werden. Weiterführende Reibmodelle sind bisher noch nicht in kommerziellen FE-Codes erhältlich, so daß deren Formulierung und Implementierung durch den Benutzer erfolgen muß.Im vorliegenden Beitrag werden Berechnungsergebnisse vorgestellt, in denen das polymere Reibverhalten mit Hilfe geeigneter Modelle abgebildet und mit experimentellen Resultaten verglichen wird. Ferner werden Berechnungen der Kontaktflächenbildung zwischen Polymerprobe und Gegenkörper mit analytisch (Hertz Theorie) und experimentell ermittelten Kontaktflächen verglichen. Hierbei wird der Einfluß verschiedener Diskretisierungen gezeigt.
    Additional Material: 10 Ill.
    Type of Medium: Electronic Resource
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