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R. M. C. de Almeida, G. L. Thomas
posted by editor (1 September 2000)
In this paper we consider a generalization to the asexual version of the Penna model for biological aging, where we take a continuous time limit...
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Pablo M. Gleiser, Sergio A. Cannas, Francisco A. Tamarit, B. Zheng
posted by editor (1 September 2000)
We introduce a model for granular flow in a one-dimensional rice pile that incorporates rolling effects through a long-range rolling probability for the individual rice grains proportional to $r^{-
ho}$, $r$ being the distance traveled by a grain in a single topling event...
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Renat Yulmetyev, Reter Hanggi, Fail Gafarov
posted by editor (1 September 2000)
In this paper we present the concept of description of random processes in complex systems with the discrete time...
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Dirk Helbing, Illes Farkas, Tamas Vicsek
posted by editor (1 August 2000)
...Here we show that simulations based on a model of pedestrian behaviour can provide valuable insights into the mechanisms of and preconditions for panic and jamming by incoordination...
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Tibor Antal, Michel Droz
posted by editor (1 August 2000)
A coarse grained description of a two-dimensional prey-predator system is given in terms of a 3-state lattice model containing two control parameters: the spreading rates of preys and predators...
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G. Caldarelli, M. Piccioni, E. Sciubba
posted by editor (1 August 2000)
In this paper we test computationally the performance of CAPM in an evolutionary setting...
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Victor S. L'vov, Anna Pomyalov, Itamar Procaccia
posted by editor (1 August 2000)
Extreme events have an important role which is sometime catastrophic in a variety of natural phenomena including climate, earthquakes and turbulence, as well as in man-made environments like financial markets...
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Yasuhide Sota, Osamu Iguchi, Masahiro Morikawa, Takayuki Tatekawa, Kei-ichi Maeda
posted by editor (1 August 2000)
...These results suggest that a scale free criticality in the gravitational interaction could be the main origin to cause the universal properties such as fractal structure and non-Gaussian velocity distribution in the 3-D self-gravitating system.
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vote
Martin Weigt, Alexander K. Hartmann
posted by editor (1 August 2000)
In this letter, we analytically describe the typical solution time needed by a backtracking algorithm to solve the vertex-cover problem on finite-connectivity random graphs...
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Damian H. Zanette, Susanna C. Manrubia
posted by editor (1 August 2000)
A stochastic model for the evolution of a growing population is proposed, in order to explain empirical power-law distributions in the frequency of family names as a function of the family size...
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