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  • 1985-1989  (3)
  • 1980-1984  (1)
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  • 1
    Monograph available for loan
    Monograph available for loan
    Dordrecht [u.a.] : Kluwer
    Call number: PIK M 370-94-0059
    Type of Medium: Monograph available for loan
    Pages: 256 p.
    ISBN: 0792301943
    Series Statement: studies in operational regional science 6
    Location: A 18 - must be ordered
    Branch Library: PIK Library
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  • 2
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Journal of regional science 27 (1987), S. 0 
    ISSN: 1467-9787
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geography , Economics
    Notes: A nonlinear model for the migration of one population between L primordially equivalent regions is introduced. The agglomeration trend k is the relevant system parameter. For low (k 〈 kc) the homogeneous population distribution and for high (k 〉 kc) states with one metropole and (L−1) depleted provinces are stable equilibria. The dynamics of phase transitions between such stable states can be described by a global nonlinear analysis. Exact analytic solutions for the population evolution along symmetry paths are found. A dynamic stability analysis shows which paths of evolution are preferred and lead to stable endconfigurations.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Theory and decision 19 (1985), S. 279-299 
    ISSN: 1573-7187
    Source: Springer Online Journal Archives 1860-2000
    Topics: Sociology , Economics
    Notes: Abstract For the purpose of describing change in an economy's structure, and addressing issues of transformation, the notion of a time-dependent macroeconomic potential function is introduced. It penalizes deviations from equilibrium (entrepreneurial error) and induces moves toward equilibrium. Thus, from the concept of a potential function is derived the concept of short-term and long-term change forces. We focus here on the long-term structural changes of an economy as distinct from short-term cyclical variations, and we represent economic transformations as phase-transitions between monostable and ambiguous bistable states of the economy. One important feature of the potential function approach is that the parameter of the potential can be determined from empirical data. In particular, the parameters can be regressed for input variables. Hence, a relationship has been established between the structural change force and a set of input variables, some of which are controlled in part by either public or private sector agents. The method has been applied to West German and United States industry data for 1950–1980.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 114 (1981), S. 67-79 
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: The Assignment of the Configuration of 7-Aminobicyclo[4.1.0]heptanes1)In bicyclo[4.1.0]heptane derivatives 1a-c with a morpholino-, a pyrrolidino-or a piperidinomoiety in 7-position the assignment to exo- endo-configuration is possible by 1H-NMR spectroscopy. The compounds 1a-c are easily obtained from enaminosulfonium salts 9. In this case endo-amino derivatives 3a-c are formed. The steric course of the substitution on bycyclo[4.1.0]heptan-7-one aminals is investigated.
    Notes: In Bicyclo[4.1.0]heptanderivaten 1a-c mit einem Morpholino-, Pyrrolidino- oder Piperidinorest in 7-Position läßt sich 1H-NMR-spektroskopisch die exo-endo-Konfiguration zuordnen. Die Verbindungen 1a-c sind auf einfache Weise aus Enaminosulfonium-Salzen 9 zugänglich. Dabei werden endo-Amino-Derivate 3a-c erhalten. Der sterische Verlauf der Substitution an Bicyclo[4.1.0]heptan-7-on-aminalen wird untersucht.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
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