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  • 1
    Electronic Resource
    Electronic Resource
    A Generalization of the Stone–Von Neumann Theorem to Nonregular Representations of the CCR-Algebra (1999)
    Springer
    Letters in mathematical physics 47 (1999), S. 307-320 
    Details
    ISSN: 1573-0530
    Keywords: Stone–von Neumann theorem ; Weyl algebra ; measurable representations.
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics , Physics
    Notes: Abstract We give a classification, up to unitary equivalence, of the representations of the C*-algebra of the Canonical Commutation Relations which generalizes the classical Stone–von Neumann Theorem to the case of representations which are strongly measurable, but not necessarily strongly continuous. The classification includes all the (nonregular) representations which have been considered in physical models.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1007599222651
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Optimization of Polypyrrole Chemical Synthesis by Heat Flow Reaction Calorimetry (1999)
    Springer
    Journal of thermal analysis and calorimetry 58 (1999), S. 3-12 
    Details
    ISSN: 1572-8943
    Keywords: conducting polymers ; polypyrrole ; pyrrole ; reaction calorimetry
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Chemical polymerization of pyrrole (Py) was carried out in a reaction calorimeter by using FeCl3 or CuCl2 as an oxidant in an acetonitrile medium. The formation heat of polypyrrole (PPy), determined under a wide range of reactant concentrations and reaction temperatures, is directly related to the PPy yields and to the degree of polymerization. Due to the negative values of both the entropy and enthalpy of the reaction the gravimetric yield is inversely related to the temperature and directly to the Py concentration. The yields to the PPy and the related reaction heats, are close to zero when the ‘ceiling temperatures’ are reached (Tceil=348 K for Fe-doped and Tceil=313 K for Cu-doped PPys). It was observed that a ‘ceiling concentration’ corresponds to each ‘ceiling temperature’ and only light oligomers are formed if Py concentration is too low. The electric conductivity values of the products were also determined and a direct relationship to the yields was found as well. The highest electric conductivity value (C=0.6 S cm−1) was related to the PPy fresh synthesized from a 0.017 M Py solution.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1010107331659
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
    Fulltext
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