Resonance in Defect Turbulence under Periodic External Force

The periodically forced spatially extended Brusselator is investigated in the chaotic regime. We explore resonant or non-resonant patterns generated under various forcing frequencies and forcing amplitudes. Resonant spatially uniform oscillation and irregular structures are found. Furthermore two types of regular spatial patterns are generated under appropriate parameters. Our results of numerical simulations demonstrate that periodic force can give rise to resonant patterns in forced systems of spatiotemporal chaos similar to the situation of forced systems of regular oscillations.     

化学洛仑兹系统中的内部分子涨落

化学混沌作为混沌动力学研究的重要内容,无论从理论上还是在实验上都已做了大量工作．理论方面的兴趣主要集中在构造内部具有合作竞争机制的反应网络,探讨以质量作用原理为基础的宏观唯象方程中具有确定性混沌的基元反应．化学混沌动力学中的一些更为深入的问题如确定性...     

Frequency sensitivity of sub-excitable systems coupled with different topology

We have investigated numerically the behaviours of identical FitzHugh－Nagumo systems, which are coupled into topologies of regular one-dimensional lattice, small-world network and scale-free network, and driven by white noise and an external signal. We found that when a number of uniform systems are coupled into a network, the system's signal-to-noise ratio remains at a high level in a wider frequency range than in the case of a single oscillator. Different architectures manifest different impact, with the scale-free network being the most remarkable. Results presented here suggest a possible approach to improve the sensitivity of a system to external signals and are helpful for designing communication equipments.