نتایج جستجو برای: evolution
تعداد نتایج: 341553 فیلتر نتایج به سال:
The evolution of the pion distribution amplitude in next-to-leading order is studied for a fixed and a running coupling constant. In both cases, the evolution provides a logarithmic modification in the endpoint region. Assuming a simple parameterization of the distribution amplitude at a scale of Q0 ∼ 0.5 GeV, it is shown numerically that these effects are large enough at Q ∼ 2 GeV that they ha...
The Second Law of Thermodynamics, Evolution, and Probability Does evolution violate the second law of thermodynamics? Creationists say yes. This article describes in detail why the creationists are wrong. Attributing False Attributes to Thermodynamics Creationists have created a 'voodoo' thermodynamics based solely on metaphors in order to convince those not familiar with real thermodynamics th...
The contribution of the theory of autopoiesis to the definition of life and biological theory affirms biological autonomy as a central notion of scientific and philosophical inquiry, and opposes other biological approaches, based on the notion of genetic information, that consider reproduction and evolution to be the central aspects of life and living phenomenology. This article reviews the aut...
We test for universal patterns in cultural evolution by Guttman scaling on two different worldwide samples of archaeological traditions and on well-known archaeological sequences. The evidence is generally consistent with universal evolutionary sequences. We also present evidence for some punctuated evolutionary events. [
5 Modelling mutational degeneration 23 5.1 Error thresholds . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24 5.1.1 The prototype model . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25 5.1.2 Methods of analysis . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26 5.1.3 Characterization of error thresholds . . . . . . . . . . . . . . . . . . . . ....
A multilinear M -dimensional generalization of Lax pairs is introduced and its explicit form is given for the recently discovered class of time-harmonic, integrable, hypersurface motions in IR.
Cultural evolution studies are characterized by the notion that culture evolves accordingly to broadly Darwinian principles. Yet how far the analogy between cultural and genetic evolution should be pushed is open to debate. Here, we examine a recent disagreement that concerns the extent to which cultural transmission should be considered a preservative mechanism allowing selection among differe...
We have studied the evolution of galaxian morphologies from ground-based, good-seeing images of 9 clusters at z=0.09-0.25. The comparison of our data with those relative to higher redshift clusters (Dressler et al. 1997, D97) allowed us to trace for the first time the evolution of the morphological mix at a look-back time of 2-4 Gyr, finding a dependence of the observed evolutionary trends on t...
We determine cosmological and evolutionary parameters from the 3CRK-band Hubble diagram and K-band number counts, assuming that the galaxies in question undergo pure luminosity evolution. Separately the two data sets are highly degenerate with respect to choice of cosmological and evolutionary parameters, but in combination the degeneracy is resolved. Of models which are either flat or have ΩΛ ...
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