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Urban chaos and replacement dynamics in nature and society
bifurcation chaos fractal dimension logistical map replacement dynamics Volterra-Lotka’s model urbanization
2011/8/29
Many growing phenomena in both nature and society can be predicted with sigmoid function. The growth curve of the level of urbanization is a typical S-shaped one, and can be described by using logisti...
Cyclic Nature of the Orbital Period Variations of some Algol-type Binaries
Algol-type Binaries Cyclic Nature U Cep
2010/4/16
The long-term period variations of the classical algol-type binaries XZ And, U Cep, b Per, RT Per, ST Per and TX UMa were studied by using all available observed times of eclipse minima. The (O-C) dia...