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Time-delayed feedback control of chaos in a GaAs/AlGaAs heterostructure

Journal of Semiconductors 2010年第5期31卷 12-16页

作者：杨癸赵雪婷 College of Physics & Electrical Engineering Anyang Normal University College of Science Hebei University of Engineering

A theoretical model has been developed to study nonlinear behaviors in a GaAs/AlGaAs heterostructure. We show that the system can exhibit chaotic oscillations under transverse magnetic fields and an electric *** time-delayed feedback method was applied to stabilize the unstable periodic orbits（UPOs） embedded in the chaotic attractor.A bifurcation specified by a successive decrease in the number of UPOs with delayed time and feedback strength was revealed,indicating the stabilization of UPOs under feedback ***,the introduction of a feedback perturbation will sometimes induce chaotic states that do not exist in the unperturbed system.

关键词： chaos feedback strength delayed time

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Noise-induced kinetics on bistability in multiple interlinked positive feedback loops

Noise-induced kinetics on bistability in multiple interlinke...

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第二届全国神经动力学学术会议

作者：毕远宏杨卓琴 School of Mathematics and Systems Science and LMIB Beihang University

A bistable system can alternate between two discrete steady states and convert continuous stimuli into discontinuous switchlike *** plays essential roles in important cellular processes.A single positive feedback loop with some ultrasensitivity is considered sufficient to act as a bistable ***,multiple interconnected positive feedback loops are frequently found in subnetworks of large cellular and genetic networks over a range of biological *** this work,a new interlinked positive feedback loops model is set up by adding two positive feedbacks between two species,based on the two-loop *** a certain stimulus level,the positive feedback strength is mainly applied to survey bistablility in the interlinked positive feedback loops,by means of codimension-1 and2 bifurcations ***,stochastic dynamics including noise-induced switching between two stable steady states,fractions of transition at the higher stable steady states and potential energy landscape are investigated when the fluctuation of external noise in the feedback strength is introduced into the rate equations.

关键词： positive feedback loops external noise bistability feedback strength

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