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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    The European physical journal 95 (1994), S. 101-111 
    ISSN: 1434-6036
    Keywords: 05.40.+j ; 02.50.+s
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Starting from the deformed commutation relationsa q (t) a † q (s)−q a † q (s) a q (t)=Γ(t−s)1, −1≦q≦1 with a covariance Γ(t−s) and a parameterq varying between −1 and 1, a stochastic process is constructed which continuously deforms the classical Gaussian and classical compound Poisson process. The moments of these distinguished stochastic processes are identified with the Hilbert space vacuum expectation values of products of $$\hat \omega _q (t) = \gamma (a_q (t) + a_q^\dag (t)) + \xi a_q^\dag (t)a_q (t)$$ with fixed parametersq, γ and ξ. Thereby we can interpolate between dichotomic, random matrix and classical Gaussian and compound Poisson processes. The spectra of Hamiltonians with single-site dynamical disorder are calculated for an exponential covariance (coloured noise) by means of the time convolution generalized master equation formalism (TC-GME) and the partial cumulants technique. The final result for the spectral function is given as aq-dependent infinite continued fraction. In the case of the random matrix processes the infinite continued fraction can be summed up yielding a self-consistent equation for the one-particle Green function.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    The European physical journal 92 (1993), S. 399-407 
    ISSN: 1434-6036
    Keywords: 05.40.+j ; 02.50.+s
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Generalized master equations correspond to different kinds of cumulants. Here, we discuss the recently introduced non-crossing cumulants from a physical point of view and propose the corresponding integro-differential master equation as a new type of equation for a self-consistent treatment of memory effects. We prove the cluster property of the non-crossing cumulants, and show that the Gaussian approximation of our equation is given by a random matrix process. As an instructive example for our expansion formula we treat the random frequency-modulated oscillator.
    Type of Medium: Electronic Resource
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  • 3
    ISSN: 0863-1786
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: 1. Es werden die bisherigen Untersuchungen über die absolute Wanderungsgeschwindigkeit gefärbter Ionen Kritisch erörtert. Hier bei zeigte es sich, daß ihre bisherige Deutung unzureichend gewesen ist. Sie beruhen auf den Differentialgleichungen von F. KOHLRAUSCH und H. WEBER, die aber lediglich für einen vollständig dissoziierten Elektrolyten abgeleitet sind, während in ihnen ein etwaiger Einfluß des Dissoziationsgrades nicht berücksichtigt ist. Die Annahme, daß hierbei die Wanderungsgeschwindigkeit eines solchen Ions wirklich gemessen wird, war daher bisher willkürlich gewesen. Sie setzte die weitere Annahme voraus, daß die starken Elektrolyte vollständig dissoziiert seien, was aber nicht ausdrücklich hervorgehoben wurde. Trotzdem ist diese bisherige Deutung richtig gewesen, wie aus diesen hier wiedergegebenen Untersuchungen hervorgeht.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 88 (1955), S. 1761-1765 
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Die Darstellung von Tetraphenyl-diboroxyd und von Tetra-p-tolyl-diboroxyd aus Phenyl- und p-Tolyl-magnesiumbromid und Borsäureester wird beschrieben.
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 87 (1954), S. 802-805 
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Die Umsetzung von Natriumtetraphenyloborat mit Salzsäure führt bei Zimmertemperatur zu Tetraphenyl-diboroxyd, das sich als Reagens auf Flavonole eignet.
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 90 (1957), S. 2638-2643 
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: 5-[Indolyl-(3)-methylen]-rhodanin aus Indol-aldehyd-(3) und 4-Oxo-2-thion-thiazolidin ermöglicht die Unterscheidung von Kupfer(I)-, von Kupfer(II)- bzw. von Quecksilber(I)- und von Quecksilber(II)-Verbindungen. Ferner kann mit dem Rhodanin der Mikrogramm-Nachweis von Edelmetallen geführt werden. Im Vergleich zum 5-[p-Dimethylamino-benzyliden]-rhodanin weist das Indolyl-methylen-Derivat analytisch verwertbare Unterschiede auf. - Die drei isomeren 5-[Pyridyl-(2.3 bzw. 4)-methylen]-rhodanine zeigen eine unterschiedliche Nachweisgrenze für Ag⊕, Hg2⊕ und Cu2⊕.
    Additional Material: 1 Tab.
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  • 7
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 72 (1939), S. 1505-1512 
    ISSN: 0365-9631
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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