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  • Articles  (57)
  • Other Sources  (33)
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  • Books  (4)
  • Articles  (57)
  • Other Sources  (33)
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  • 1
    Electronic Resource
    Electronic Resource
    Dimension reduction projection and our perception of evolution (1985)
    Springer
    Journal of mathematical biology 21 (1985), S. 299-306 
    Details
    ISSN: 1432-1416
    Keywords: Evolution ; punctuated equilibria ; projection pursuit ; Brownian motion ; pattern recognition
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Mathematics
    Notes: Abstract The evolution of a species can be viewed as a trajectory in multidimensional space. What we perceive is only a low dimensional projection from the total dimensionality necessary to fully describe a species. Motivated by the phenomenon of punctuated equilibria, it is shown that there are projections of gradualistic evolution which will have a punctuated character. However, whether our eyes and minds would choose such a projection of the total phenotype is not resolved.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00276228
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  • 2
    Electronic Resource
    Electronic Resource
    Reactivity of Deformed Metal Surfaces (1963)
    [s.l.] : Nature Publishing Group
    Nature 197 (1963), S. 374-375 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Small tensile specimens (0-25 in. wide x 0-02 in. thick) were formed from rolled sheets of high-purity copper, iron and aluminium. These were annealed in an argon atmosphere, then etched for a standard time, copper and iron in aqueous nitric acid and aluminium in aqueous hydrofluoric acid. After ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/197374a0
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  • 3
    Electronic Resource
    Electronic Resource
    Low Temperature Reduction of Iron Oxides (1955)
    s.l. : American Chemical Society
    The @journal of physical chemistry 〈Washington, DC〉 59 (1955), S. 65-67 
    Details
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/j150523a018
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  • 4
    Electronic Resource
    Electronic Resource
    Growth of Sulphide Films on Steel (1960)
    [s.l.] : Nature Publishing Group
    Nature 187 (1960), S. 588-589 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] In order to simulate the brief temperature flashes, which occur when gear teeth mesh, rectangular pulses of electric current were passed through a metal wire, a method of heating previously used in the Thornton Research Centre. The pulses lasted for 4 m.sec. and were followed by periods of 40 ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/187588a0
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  • 5
    Electronic Resource
    Electronic Resource
    The crystal structure of hexacene, and a revision of the crystallographic data for tetracene (1962)
    Copenhagen : International Union of Crystallography (IUCr)
    Acta crystallographica 15 (1962), S. 289-290 
    Details
    ISSN: 0001-5520
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Geosciences
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0365110X62000699
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  • 6
    Electronic Resource
    Electronic Resource
    The crystal and molecular structure of pentacene (1961)
    Copenhagen : International Union of Crystallography (IUCr)
    Acta crystallographica 14 (1961), S. 705-711 
    Details
    ISSN: 0001-5520
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Geosciences
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0365110X61002163
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  • 7
    Electronic Resource
    Electronic Resource
    The effect of variable environments on polymorphism at loci with several alleles I. A symmetric model (1981)
    Springer
    Journal of mathematical biology 13 (1981), S. 199-208 
    Details
    ISSN: 1432-1416
    Keywords: Population genetics ; Polymorphism ; Multiple alleles ; Geographic variation ; Temporal variation ; Symmetric selection
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Mathematics
    Notes: Abstract Much of the extant polymorphism has been attributed to spatial and temporal variation among selection regimes. Analysis of models entailing two alleles at a single locus has demonstrated that polymorphism may result from variation among selection regimes which prescribe monomorphism if constant. This relationship is studied in the context of several alleles at a locus. One result which is not valid with only two alleles is that variation among selection regimes which specify polymorphic equilibria may lead to a stable monomorphic equilibrium. The analyses of temporal variation and total panmixia spatial variation among environments show that temporal variation allows the simultaneous stability of equilibrium configurations which cannot be simultaneously stable under total panmixia spatial variation (hard or soft selection). The principle that polymorphism is more readily maintained with spatial than temporal variation is invalidated.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00275214
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  • 8
    Electronic Resource
    Electronic Resource
    The effect of variable environments on polymorphism at loci with several alleles II. Submultiplicative viabilities (1982)
    Springer
    Journal of mathematical biology 15 (1982), S. 293-303 
    Details
    ISSN: 1432-1416
    Keywords: Temporal variation ; Geographic variation ; Multiple alleles ; Population genetics
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Mathematics
    Notes: Abstract Circumstances assuring a unique stable equilibrium are investigated for a subdivided population with several alleles segregating at a single locus. For a broad class of selection regimes entailing heterozygote viabilities greater than the geometric mean of the corresponding homozygote viabilities, a stable fixation state precludes any other stable equilibria if either total-panmixia or temporal variation is operating. This extends known results for two alleles at a single locus and partially delimits when some of the bizarre behaviour engendered by multiple alleles may occur.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00275689
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  • 9
    Electronic Resource
    Electronic Resource
    Half-sib mating structures (1993)
    Springer
    Journal of mathematical biology 31 (1993), S. 241-252 
    Details
    ISSN: 1432-1416
    Keywords: Inbreeding ; Difference equations
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Mathematics
    Notes: Abstract All ways in which all matings in a population can be between half-sibs under a generalization of regular systems of inbreeding are characterized for both finite and infinite populations. A model of random half-sib mating is developed and analyzed, and the asymptotic configuration of populations subject to it is described. The classical model of half-sib mating which ensues from the standard definition of regular systems of inbreeding is only one of many ways a population can propagate by half-sib mating, and a wide range of genetic identity is possible dependent on which half-sib mating structure governs a population.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00166144
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  • 10
    Electronic Resource
    Electronic Resource
    Fusion technology for a magnetic fusion production reactor (1987)
    Springer
    Journal of fusion energy 6 (1987), S. 5-57 
    Details
    ISSN: 1572-9591
    Keywords: magnetic fusion production reactor ; tritium production ; fusion breeder
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract The tandem mirror and tokamak are being considered as candidate fusion drivers for a materials production reactor that could be implemented in the 1990s. This report considers, in detail, the required performance characteristics of the fusion plasma and the major technological subsystems for each fusion driver. These performance characteristics are compared with the present state of the art, corresponding development needs are identified, and technology program requirements, in addition to those now being supported by the Department of Energy, are pointed out. The tandem mirror and tokamak fusion drivers are also compared with regard to their required advancements in plasma performance and technology development.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01053330
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