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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Journal of statistical physics 63 (1991), S. 305-313 
    ISSN: 1572-9613
    Keywords: Turbulence ; diffusion ; helicity ; convection ; incompressible fluids
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Through the use of the Novikov-Furutsu formula for Gaussian processes an equation is obtained for the diffusion of the ensemble average of a passive scalar in an incompressible turbulent velocity field in terms of the two-point, two-time correlator of this field. The equation is valid for turbulence which is not necessarily homogeneous or stationary and thus generalizes previous work.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1432-1386
    Keywords: Technometrics ; Technological excellence ; Innovation ; Schumpeter ; Evolutionary models ; O30 ; O33
    Source: Springer Online Journal Archives 1860-2000
    Topics: Economics
    Notes: Abstract What is the relation between the average level of complexity that characterizes a product's technology, and the degree of diversity of that technology across rival firms? Evolutionary theories of innovation and technical advance are consistent with either a direct or an inverse relation. The issue thus becomes an empirical one. This paper uses a unique database containing detailed quantitative data on the specifications of 12 high-tech product groups for the U.S., Japan and selected European countries, for 1982, for both products and processes. It is found that the more complex the technology, the less diverse is the technology of rival firms that produce the product. This is consistent with the following evolutionary process: Economies of scale and scope inherent in high-level technologies require firms who adopt them to dispose entirely of older technologies, in order to remain competitive; at the same time, older, simpler technologies continue to exist and permit wide diversities among firms who pursue “niche” market strategies.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Journal of statistical physics 53 (1988), S. 95-108 
    ISSN: 1572-9613
    Keywords: Turbulence ; self-organization ; helicity ; incompressible fluids
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The stability of incompressible turbulent fluids with respect to weak mean flow perturbations is discussed. It is shown that for a statistically homogeneous, isotropic, and stationary model such perturbations will decay. This is in marked contrast to the compressible case.
    Type of Medium: Electronic Resource
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