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  • Analytical Chemistry and Spectroscopy  (1)
  • Applied Mathematics  (1)
  • 1
    Electronic Resource
    Electronic Resource
    Layer potentials and boundary value problems for the helmholtz equation in the complement of a thin obstacle (1983)
    Chichester, West Sussex : Wiley-Blackwell
    Mathematical Methods in the Applied Sciences 5 (1983), S. 389-421 
    Details
    ISSN: 0170-4214
    Keywords: Mathematics and Statistics ; Applied Mathematics
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mathematics
    Notes: Our purpose is to show in a precise manner the mathematical approach of the problem of the acoustic diffraction by an infinitely thin screen. The classical equations of acoustics are transformed into integral equations. The sound field diffracted by the obstacle is described by a double layer potential, the density of which is equal to the step of the potential across the screen. To avoid the mathematical difficulties, the infinitely thin screen will be considered as the limit of a sequence of obstacles with finite thickness. On such obstacles, the operators can be defined, thanks to the theory of Pseudo-differential operators and Pseudo-Poisson kernels. Then a limiting process is used and gives existence and unicity of the desired solutions in Sobolev spaces.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mma.1670050126
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Sur les complexes formés par le trifluorure de bore avec les sulfoxydes, aminoxydes, phosphinoxydes et arsinoxyde: Aspects généraux des spectres de RMN (1H, 11B, 19F et 31P) (1973)
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 5 (1973), S. 357-360 
    Details
    ISSN: 0030-4921
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Various complexes (RnMO·BF3) of boron trifluoride with sulphoxides, aminoxides, phosphinoxides and arsinoxides have been prepared and investigated using proton, fluorine (at variable temperature) boron and phosphorus resonance. A comparison with similar adducts containing a co-ordinative O—B bond is presented.
    Notes: Les spectres de résonance magnétique nucléaire (1H, 11B, 19F et 31P) des complexes RnMO·BF3 formés par le trifluorure de bore et des sulfoxydes, aminoxydes, phosphinoxydes et arsinoxydes ont été obtenus. Les paramètres (déplacements et couplages) caractérisant ces spectres sont comparés à ceux de composés similaires renfermant également une liaison de coordination O·B.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mrc.1270050803
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
    Fulltext
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