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  • Optical activity  (2)
  • AMS(MOS) 65L05, 58F08, 58F22  (1)
  • Polymer and Materials Science  (1)
  • 1
    Digitale Medien
    Digitale Medien
    Springer
    Numerische Mathematik 51 (1987), S. 103-122 
    ISSN: 0945-3245
    Schlagwort(e): AMS(MOS) 65L05, 58F08, 58F22 ; CR: G1.7
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Mathematik
    Notizen: Summary We show that a one-step method as applied to a dynamical system with a hyperbolic periodic orbit, exhibits an invariant closed curve for sufficiently small step size. This invariant curve converges to the periodic orbit with the order of the method and it inherits the stability of the periodic orbit. The dynamics of the one-step method on the invariant curve can be described by the rotation number for which we derive an asymptotic expression. Our results complement those of [2, 3] where one-step methods were shown to create invariant curves if the dynamical system has a periodic orbit which is stable in either time direction or if the system undergoes a Hopf bifurcation.
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 2
    ISSN: 1432-2234
    Schlagwort(e): Optical activity ; Chirality functions ; Phosphanes and phos-phinoxides
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie
    Beschreibung / Inhaltsverzeichnis: Zusammenfassung Die molaren Drehungen von 7 Horner-Phosphanen und 16 Phosphinoxiden werden als experimentelle Basis für einen Test approximativer Chiralitätsfunktionen verwendet. Unter Zugrundelegung der Gerüstsymmetrie C3v für diese Verbindungsklasse stellen Zweiligandenfunktionen eine gute Näherung dar; eine Approximation unter Verwendung ligandenspezifischer Zahlen führt nur bei einigen Beispielen zum Erfolg.
    Notizen: Abstract Seven optically active phosphanes and sixteen phosphin-oxides are used to test approximative chirality functions experimentally. Based onC 3v -symmetry of the molecular skeleton two-ligand-functions yield a good approximation for the experimental data. Ligand-specific parameters can only be gained from a few compounds.
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 3
    Digitale Medien
    Digitale Medien
    Chichester [u.a.] : Wiley-Blackwell
    Surface and Interface Analysis 22 (1994), S. 346-349 
    ISSN: 0142-2421
    Schlagwort(e): Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Physik
    Notizen: The application of ellipsometry to study the SiOx/Si system subjected to hydrostatic pressures up to 1.8 GPa at temperatures up to 1280 °C is described. The theoretical model of defects as the spherical disturbances of material has been assumed. The ellipsometric parameters have been analysed as a function of defects size and density and compared with data obtained by etching and x-ray methods. The applicability of ellipsometry for near-surface defect structure analysis has been discussed.
    Zusätzliches Material: 4 Ill.
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 4
    ISSN: 0570-0833
    Schlagwort(e): Chirality functions ; Optical activity ; Methane derivatives ; Chemistry ; General Chemistry
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: The optical activity can provide detailed information about the configuration and conformation of methane derivatives if the chirality function is resolved, according to the theory of chirality functions[3] and the quantum mechanical theory of the optical activity of methane derivatives[4], into its components which are compared with experimental data. A first step in this direction is undertaken in the present article and it will be shown that the second approximation method for determining the conformationally independent contribution to the optical activity yields quantitatively good results. Description of the overall optical rotation by this component is expectedly poor where interactions between ligands, e. g. hydrogen bonding, tend to favor specific conformations. A quantitative understanding of such additional effects appears promising in conjunction with analyses of the kind described.
    Zusätzliches Material: 6 Tab.
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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