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  • 1980-1984  (3)
  • 1975-1979  (2)
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  • 1
    Electronic Resource
    Electronic Resource
    A Mathematical Model of Pattern Formation by Swimming Microorganisms (1975)
    Oxford, UK : Blackwell Publishing Ltd
    The @journal of eukaryotic microbiology 22 (1975), S. 0 
    Details
    ISSN: 1550-7408
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Bioconvection in suspensions of Tetrahymena pyriformis and Crypthecodinium cohnii is described and 2 new patterns, the toroid and the cat's-eye, which appear in shallow suspensions of C. cohnii, are reported. Except in very dense cultures, bioconvection does not arise unless the depth of the suspensions or the mean concentration exceed certain critical values, other things being equal. A mathematical model describing the hydrodynamics of suspension of negatively geotactic microorganisms is described which predicts the existence of critical depths and concentrations. The equations presented admit solutions describing the “polka-dot” patterns seen at low organism concentration in suspensions slightly deeper than the critical value. The discussion here is limited to the case of fairly dilute suspensions, but the basic approach can be applied also to richer cultures.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1550-7408.1975.tb05871.x
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Seiches in supergranules (1976)
    [s.l.] : Nature Publishing Group
    Nature 264 (1976), S. 424-426 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Hill et al. in Arizona detected a discrete spectrum of oscillations in an effective diameter of the Sun, with periods decreasing from 1 h. Apparent variations in this diameter can be caused by changes in the limb darkening function arising from temperature and density perturbations, but, if one ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/264424a0
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    A CLASS OF ORDINARY DIFFERENTIAL EQUATIONS WITH STRANGE ATTRACTORS (1980)
    Oxford, UK : Blackwell Publishing Ltd
    Annals of the New York Academy of Sciences 357 (1980), S. 0 
    Details
    ISSN: 1749-6632
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Natural Sciences in General
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1749-6632.1980.tb29696.x
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    The 1/ƒ distribution for tuneable oscillators (1983)
    [s.l.] : Nature Publishing Group
    Nature 306 (1983), S. 248-249 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Consider a large, fixed assembly of oscillators of unit mass, each of which can assume a different frequency. Let P1(w)) be the distribution of frequencies among the oscillators. We require that this distribution be normalized: P1(w) = 1 (1) where the integration is over a physically dictated ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/306248a0
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    Paper (German National Licenses)
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  • 5
    Electronic Resource
    Electronic Resource
    Magnetic activity and variations in solar luminosity (1980)
    [s.l.] : Nature Publishing Group
    Nature 287 (1980), S. 616-617 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] The magnetic field in the solar envelope is believed to be predominantly toroidal and generated by differential rotation11'12. Flux expulsion and magnetic buoyancy11'12 will quickly sweep toroidal fields from the convective zone. Moreover, the observed large scales of coronal holes and complexes of ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/287616a0
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    Paper (German National Licenses)
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