A transformation of Markov jump processes and applications in genetic study
Xian Chen Zhi-Ming Ma
In this paper we provide a verifiable necessary and sufficient condition for a regular q-process to be again a q-process under a transformation of state space. The result as well as some other results on continuous states Markov jump processes is employed to investigate jump processes arising from the study in modeling genetic coalescent with recombination.
keywords: Markov jump process $\psi$-transform q-consistency q-process coalescent with recombination.
Chaos control in a pendulum system with excitations
Xianwei Chen Zhujun Jing Xiangling Fu
This paper is devoted to investigate the problem of controlling chaos for a pendulum system with parametric and external excitations. By using Melnikov methods, the criteria of controlling chaos are obtained. Numerical simulations are given to illustrate the effect of the chaos control for this system, suppression of homoclinic chaos is more effective than suppression of heteroclinic chaos, and the chaotic motions can be suppressed to period-motions by adjusting parameters of chaos-suppressing excitation. Finally, we calculate the maximum Lyapunov exponents (LE) in parameter-plane and observe the frequency of chaos-suppressing excitation also play an important role in the process of chaos control.
keywords: bifurcation Melnikov methods. Pendulum equation chaos control
A local min-orthogonal method for multiple solutions of strongly coupled elliptic systems
Xianjin Chen Jianxin Zhou
The aim of this paper is to numerically investigate multiple solutions of semilinear elliptic systems with zero Dirichlet boundary conditions

-$\Delta u=F_u(x;u,v),$   $x\in\Omega,
-$\Delta v=F_v(x;u,v),$   $x\in\Omega,

where $\Omega \subset \mathbb{R}^{N}$ ($N\ge 1$) is a bounded domain. A strongly coupled case where the potential $F(x;u,v)$ takes the form $|u|^{\alpha_1}|v|^{\alpha_2}$ with $\alpha_1, \alpha_2>1$ is specially studied. By using a local min-orthogonal method, both positive and sign-changing solutions are found and displayed.

keywords: min-orthogonal method Cooperative systems multiple solutions

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