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  • 1
    Electronic Resource
    Electronic Resource
    Computer simulations of n-alkane melts (1991)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 95 (1991), S. 4709-4714 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Stochastic dynamics simulations of n-alkane melts (C13H28 and C28H58 ) have been performed in order to calculate their static properties. The system consists of linear chains of mass points, which are connected by fixed bond lengths. Each point of a chain is subjected to valence bond and torsional forces. Additionally, nonbonded interactions are taken into account by a truncated, Lennard-Jones potential. The mean-square end-to-end distance and the radius of gyration of the chains as well as the average fraction of trans conformations were calculated and compared with the results obtained by Monte Carlo simulations and by unperturbed rotational isomeric states model calculations. The comparison exhibits very good agreement between the results of the different approaches, and demonstrates the potential advantages of stochastic dynamics simulations for polymeric systems. An investigation of different torsional potentials exhibited the subtle effect of the curvature of the torsional potential on bulk structures.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.461741
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    The plasmon density of states of a layered electron gas (1993)
    Springer
    The European physical journal 90 (1993), S. 277-281 
    Details
    ISSN: 1434-6036
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The plasmon density of states (DOS)p(ω) of a layered electron gas (LEG) is studied theoretically. It is shown thatp(ω) is a linear function of frequency ω as ω goes to 0, and then increases more rapidly as ω tends to the screened, three dimensional plasma frequency ωp. We also study the partial densities of state for constantK andq z , whereK andq z are the magnitude of the transverse and perpendicular momentum transfers. A possible experimental probe for the plasmon DOS is discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01433048
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Positron-annihilation lifetime in the high-T c Oxides (1990)
    Springer
    Journal of superconductivity 3 (1990), S. 227-231 
    Details
    ISSN: 1572-9605
    Keywords: Positron annihilation ; theory ; high-temperature superconductivity
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: Abstract The superconducting transition affects the positron-annihilation lifetime in the high-Tc oxides. This effect is due to the unusual properties of the oxides in the normal state and, in particular, to the small Fermi energy. The value of the shift also depends on the interlayer distance.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00624513
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Alternative parameterizations in business tendency surveys (1990)
    Springer
    Mathematical methods of operations research 34 (1990), S. 143-156 
    Details
    ISSN: 1432-5217
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics , Economics
    Notes: Summary In business surveys, the response categories most often are of the type “increase”, “no increase” and “decrease”. In modelling how the response variable depends on exogeneous variables one has to decide whether the response categories can be treated as ordered or unordered categories. Though the response categories are constructed as ordered categories it is not so clear that the respondent actually uses them as ordered. The middle category may be used as a “don't know” category if the respondent has insufficient information. Here categorical regression models are considered for the ordered and the unordered case. Three types of models are investigated: unordered models resulting from utility maximization, threshold models and two-step models which treat the middle category explicitely as a separate category. The relationship between models is considered. The models are applied to a sample of the IFO-Konjunkturtest and are compared to each other.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01415977
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    Paper (German National Licenses)
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