Two methods are performed to manifest chaos in a kicked top model. On the one hand we can see that time evolutions and variances of the dynamical variables in regular and chaotic case are obviously different. So the uncertainty measure is convenient for a system with a time-dependent Hamilton....

The influence of fractal heterogeneity on a spiral wave in an excitable system is numerically studied based on the Barkley model. The heterogeneity is implemented by letting the diffusive coefficient in the heterogeneous area be different from the other area. The results show that fruitful...

Ranking nodes by their spreading ability in complex networks is a fundamental problem which relates to wide applications. Local metric like degree centrality is simple but less effective. Global metrics such as betweenness and closeness centrality perform well in ranking nodes, but are of high...