共查询到19条相似文献，搜索用时 62 毫秒
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A novel adaptive synchronization method is proposed for two identical Rossler and Chen systems with uncertain parameters. Based on Lyapunov stability theory, we derive an adaptive controller without the knowledge of the system parameters, which can make the states of two identical Rossler and Chen systems globally asymptotically synchronized. Especially, when some unknown uncertain parameters are positive, we can make the controller more simple and, besides, the controller is independent of those positive uncertain parameters. All results are proved using a well-known Lyapunov stability theorem. Numerical simulations are given to validate the proposed synchronization approach. 相似文献
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In this paper, a new method for controlling projective synchronization in coupledchaotic systems is presented. The control method is based on a partially lineardecomposition and negative feedback of state errors. Firstly, the synchronizabilityof the proposed projective synchronization control method is proved mathematically.Then, three different representative examples are discussed to verify thecorrectness and effectiveness of the proposed control method. 相似文献
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Impulsive synchronization of two chaotic maps is reformulated as impulsive control of the synchronization error system.We then present a theorem on the asymptotic synchronization of two chaotic maps by using synchronization impulses with varying impulsive intervals,As an example and application of the theroem,we derives some sufficient conditions for the synchronization of two chaotic Lozi maps via impulsive control.The effectivness of this approach has been demonstrated with chaotic Lozi map. 相似文献
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In this paper, an approach to the control of continuous-timechaotic systems is proposed using the Takagi--Sugeno (TS) fuzzy model and adaptiveadjustment. Sufficient conditions are derived to guarantee chaoscontrol from Lyapunov stability theory. The proposed approachoffers a systematic design procedure for stabilizing a large classof chaotic systems in the literature about chaos research. Thesimulation results on R\"{o}ssler's system verify theeffectiveness of the proposed methods. 相似文献
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In this paper, a simple adaptive linear feedback control method is proposed for controlling the scaling factor between two coupled unified chaotic systems to a desired value, based on the invarianee principle of differential equations. Under this control strategy, one can arbitrarily select the scaling factor. Numerical simulations are given to support the effectiveness of the proposed method and show the robustness against noise. Furthermore, a secure communication scheme based on the adaptive projective synchronization of unified chaotic systems is presented and numerical simulation shows its feasibility.[第一段] 相似文献
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This paper investigates the function cascade synchronization of chaos system. Combining cascade synchronization scheme, parametric adaptive control and projective synchronization scheme, it proposes a new function cascade synchronization scheme to address a generalized-type synchronization problem of three famous chaotic systems： the Lorenz system, Liu system and RSssler system, the states of two identical chaotic systems with unknown parameters can be asymptotically synchronized by choosing different special suitable error functions. Numerical simulations are used to verify the effectiveness of the proposed synchronization techniques. 相似文献
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In this paper we numerically investigate the chaoticbehaviours of the fractional-order Ikeda delay system. The results showthat chaosexists in the fractional-order Ikeda delay system with order less than 1.The lowest order for chaos to be able to appear in this system is foundto be 0.1. Master--slavesynchronization of chaotic fractional-order Ikeda delay systems with linearcoupling is also studied. 相似文献
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We propose an impulsive control scheme for fractional-order chaotic systems. Based on the Takagi-Sugeno （T-S） fuzzy model and linear matrix inequalities （LMfs）, some sufficient conditions are given to stabilize the fractional-order chaotic system via impulsive control. Numerical simulation shows the effectiveness of this approach. 相似文献
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Based on two modified Rosslor hyperchaotic systems, which are derived from the chaotic Rosslor system by introducing a state feedback controller, this paper proposes a new switched Rosslor hyperchaotic system. The switched system contains two different hyperchaotic systems and can change its behaviour continuously from one to another via a switching function. On the other hand, it presents a systematic method for designing the circuit of realizing the proposed hyperchaotic system. In this design, circuit state equations are written in normalized dimensionless form by rescaling the time variable. Furthermore, an analogous circuit is designed by using the proposed method and built for verifying the new hyperchaos and the design method. Experimental results show a good agreement between numerical simulations and experimental results. 相似文献
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LI Yang LIAO Xiao-Feng LI Chuan-Dong CHEN Guo 《理论物理通讯》2007,47(6):1067-1072
The issue of impulsive synchronization of the coupled chaotic laser plasma system is investigated. A new framework for impulsive synchronization of such chaotic systems is presented, which makes the synchronization error system a linear impulsive control system. We derive some sufficient conditions for the synchronization of a laser plasma system via impulsive control with the varying impulsive intervals, which allows us to derive the impulsive synchronization law easily. To illustrate the effectiveness of the proposed results, two numerical examples are given. 相似文献
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We propose a scheme to implement the Deutsch-Jozsa algorithm by using Schroedinger cat states in cavity quantum electron-dynamics （QED）. The scheme is based on the Raman interaction of a degenerate three-level A-type atom with a coherent state in a cavity. By using Schroedinger cat states, the atomic spontaneous emission can be minimized and the Hadamard transformation in our scheme is not needed. 相似文献
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Entropy evolvement properties in a system of Schrodinger cat state light field interacting with two entangled atoms 
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下载免费PDF全文 The field entropy can be regarded as a measurement of the degree ofentanglement between the light field and the atoms of a system which iscomposed of two-level atoms initially in an entangled state interacting with the Schr\"{o}dinger cat state. The influences of the strength of light field and the phase angle between the two coherent states on the field entropy are discussed by using numerical calculations. The result shows that when the strength of light field is large enough the field entropy is not zero and the degrees of entanglement between the atoms and the three different states of the light fields are equal. When the strength of the light field is small, the degree of entanglement is maximum in a system of the two entangled atoms interacting with an odd coherent state; it is intermediate for a system of the two entangled atoms interacting with the Yurke--Stoler coherent state, and it is minimum in a system of the two entangled atoms interacting with an even coherent state. 相似文献
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The fundamental and second order strongly nonlocal solitons of thenonlocal nonlinear Schr\"{o}dinger equation for several types ofnonlocal responses are calculated by Ritz's variational method. Fora specific type of nonlocal response, the solutions of the stronglynonlocal solitons with the same beam width but different degrees ofnonlocality are identical except for an amplitude factor. For anonlocal case where the nonlocal response function decays in directproportion to the $m$th power of the distance near the source point,the power and the phase constant of the strongly nonlocal soliton arein inverse proportion to the $(m+2)$th power of its beam width. 相似文献
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The Eotvos experiment on the verification of equivalence between inertial mass and gravitational mass of a body is famous for its accuracy. A question is, however, can these experimental results be applied to the case of a physical space in general relativity, where the space coordinates could be arbitrary？ It is pointed out that it can be validly applied because it has been proven that Einstein＇s equivalence principle for a physical space must have a frame of reference with the Euclidean-like structure. Will claimed further that such an overall accuracy can be translated into an accuracy of the equivalence between inertial mass and each type of energy. It is shown that, according to general relativity, such a claim is incorrect. The root of this problem is due to an inadequate understanding of special relativity that produced the famous equation E=mc^2, which must be understood in terms of energy conservation. Concurrently, it is pointed out that this error is a problem in Will＇s book, ‘Theory and Experiment in Gravitational Physics＇. 相似文献
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From the study of the dynamics for the ring-like soliton clusters, we find that there exists a critical value of the ring radius, dcr, for the stationary rotation of the clusters with respect to the beam centre even in the presence of the relatively strong noise, and that the soliton clusters will not rotate but only undergo periodic collisions in the form of simple harmonic oscillator if the ring radius is large enough. We also show that the direction of the rotation can be opposite to the direction of phase gradient when the relative phase difference is within the domain 0 〈 ｜θ｜ 〈 π, while along the direction of phase gradient when the relative phase difference is within the domain π 〈｜θ｜ 〈 2π 相似文献