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郑志刚, Zhigang Zheng, , M.C. Cross, and Gang Hu
PHYSICAL REVIEW LETTERS, 2002, 89 (15): 154102-1~154102-4,-0001,():
-1年11月30日
A mechanism responsible for the directed transport of symmetrically coupled lattices in a symmetric periodic potential is proposed. Under the action of an external wave that breaks the spatiotemporal symmetry and introduces inhomogeneities of the lattice, a net unidirectional current can be observed, originating from a collaboration of the lattice (periodic potential and mutual interactions) and the wave (amplitude, frequency, and phase shifts). Mode-locking induced resonant steps are observed and predicted. The directed transport can be optimized and furthermore controlled by suitably adjusting the parameters of the system.
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【期刊论文】Collective Directional Transport in Coupled Nonlinear Oscillators without External Bias
郑志刚, Zhigang Zheng, Gang Hu, and Bambi Hu,
PHYSICAL REVIEW LETTERS, 2001, 86 (11): 2273~2276,-0001,():
-1年11月30日
Directed collective motion in a circular array of unidirectionally coupled oscillators with symmetric potential is obtained numerically in the absence of external bias. This striking feature is interpreted as the effect of the spontaneous breaking of temporal symmetry of the coupling. It is revealed that a proper match of various control parameters is important in generating an optimal coherent global transport. Noise-sustained directed transport is also observed, and the related stochastic resonance in an autonomous system is identified..
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郑志刚, Zhigang Zheng, , * Xingang Wang, and Michael C. Cross
PHYSICAL REVIEW E, VOLUME 65, 056211,-0001,():
-1年11月30日
Generalized synchronization in an array of mutually (bidirectionally) coupled nonidentical chaotic oscillators is studied. Coupled Lorenz oscillators and coupled Lorenz-Rossler oscillators are adopted as our working models. With increasing the coupling strengths, the system experiences a cascade of transitions from the partial to the global generalized synchronizations, i.e., different oscillators are gradually entrained through a clustering process. This scenario of transitions reveals an intrinsic self-organized order in groups of interacting units, which generalizes the idea of generalized synchronizations in drive-response systems.
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【期刊论文】Thermodynamic second law in irreversible processes of chaotic few-body systems
郑志刚, Gang Hu, , Zhigang Zheng, Li Yang, and Wei Kang
PHYSICAL REVIEW E, VOLUME 64, 045102 (R),-0001,():
-1年11月30日
Irreversible processes of few hard-ball (N) mechanical systems are investigated numerically and compared with the theoretical results of quasistatic processes. The thermodynamic second law is valid for N≥2 for both equilibrium and nonequilibrium systems if the average ensemble of the large number of identical systems is taken.
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【期刊论文】Generalized synchronization versus phase synchronization
郑志刚, Zhigang Zheng and Gang Hu
PHYSICAL REVIEW E, 2000, 62 (6): 7882~7885,-0001,():
-1年11月30日
The relation between generalized synchronization and phase synchronization is investigated. It was claimed that generalized synchronization always leads to phase synchronization, and phase synchronization is a weaker form than generalized synchronization. We propose examples that generalized synchronization can be weaker than phase synchronization, depending on parameter misfits. Moreover, generalized synchronization does not always lead to phase synchronization.
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