共查询到20条相似文献,搜索用时 23 毫秒
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In this paper, we study the chaotic behaviors in a fractional order logistic delay system. We find that chaos exists in the fractional order logistic delay system with an order being less than 1. In addition, we numerically simulate the continuances of the chaotic behaviors in the logistic delay system with orders from 0.1 to 0.9. The lowest order we find to have chaos in this system is 0.1. Then we further investigate two methods in controlling the fractional order chaotic logistic delay system based on feedback. Finally, we investigate a lag synchronization scheme in this system. Numerical simulations show the effectiveness and feasibility of our approach. 相似文献
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Dmitry V. Averyanov Ivan S. Sokolov Igor A. Karateev Alexander N. Taldenkov Oleg A. Kondratev Oleg E. Parfenov Andrey M. Tokmachev Vyacheslav G. Storchak 《Advanced functional materials》2021,31(36):2104925
Integration of oxides with silicon fuses advanced functional properties with a mature technological platform. In particular, direct EuO/Si contact holds high promise for spintronics but requires single-crystalline epitaxial films with atomically sharp interfaces. The standard approach employing regular 2D superstructures of metal atoms on the Si surface fails to meet the challenge. Here, an alternative route is designed and shown to solve the problem. This route avoids regular templates; the chaotic 2D distribution of metal atoms on the Si surface prevents stabilization of unwanted crystal orientations. Thus, the disordered submonolayer phase at the interface promotes order in oxide/Si coupling, as witnessed by a combination of diffraction techniques and high-resolution electron microscopy. The results not only mark tangible progress in manufacturing EuO/Si contacts but also provide a general framework for monolithic integration of functional oxides with semiconductor substrates. 相似文献
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为了对分数阶超混沌系统中的未知参数进行准确估计,提出一种量子混沌粒子群优化算法(Quantum chaos particle swarm optimization,QCPSO).该算法通过对量子粒子群优化算法(Quantum behaved particle swarm optimization,QPSO)的实现机理进行分析,并结合量子纠缠与混沌系统之间的相关性而实现.首先,将量子势阱中心视为混沌吸引子围绕的不动点,处于吸引子外部的粒子会逐渐聚集于吸引子之内,而处于吸引子内部的粒子会出现快速分离扩散的现象;然后,采用基于随机映射的粒子更新机制,充分保证混沌粒子的初值多样性;最后,提出了基于不动点中心的尺度自适应策略,解决了算法后期的搜索停滞问题.运用QCPSO算法对典型分数阶超混沌系统参数进行估计,结果表明,该算法在收敛速度与精度上优于改进的差分进化算法、自适应人工蜂群算法以及改进的量子粒子群优化算法. 相似文献
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混沌理论在雷达海杂波的研究中取得了令人鼓舞的成果.基于混沌理论的海杂波模型在信号检测方面表现出较好的性能,具有很好的杂波抑制能力,对传统的雷达信号检测技术形成了一定的挑战.本文概括了海杂波混沌模型的基本概念和研究方法,分析了混沌理论在该领域的应用现状及动态,探讨了该领域研究的发展趋势. 相似文献
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Dominique Escande 《电信纪事》1987,42(5-6):210-216
Hamiltonian chaos is illustrated through the chaotic regime of a synchronous dipolar motor. This regime is explained with a quite simple Hamiltonian which describes the nonlinear pendulum in a particular limiting case. Phase space structure as revealed by a stroboscope relies upon the nesting of resonances and the tangle of stable and unstable manifolds. 相似文献
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分数阶简并光学参量振荡器系统的混沌及同步 总被引:1,自引:1,他引:0
构建了分数阶简并光学参量振荡器系统,利用分数阶系统稳定性理论,得到了分数阶简并光学参量振荡器系统存在混沌现象的必要条件,给出了系统在满足必要条件下的混沌吸引子.实现了分数阶简并光学参量振荡器混沌系统的混沌同步,在同步过程中并未删去响应系统的所有非线性信息,理论分析和数值研究结果的一致性表明了该方法的有效性. 相似文献
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《IEE Review》1993,39(5):199-203
Advances in nonlinear dynamics have brought a revolution in the view of dynamical behaviour, with major implications for anyone engaged in engineering system design. The most obvious reason for knowing about chaos is to recognise it, and avoid it. For instance, chaotic modes of vibration can cause serious, and wholly unexpected, damage, threatening the stability of mechanical structures or of subsystems within communications networks. More positively, chaos can be useful. Many applications rely on some form of pseudorandom number generator: chaos theory offers a novel means of generating such numbers using simple functions. The author briefly explains the terminology of dynamic systems and then discusses Lorenz attractors, logistic mapping and bifurcation 相似文献
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We have analyzed the behavior of a semiconductor laser subjected to increasing external injection. Numerical simulations show the well-known nonlinear modulation and locking regimes, followed by an intermediate chaotic region that precedes definitive locking to the external source at significantly higher injection levels 相似文献
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考虑到蔡氏电路受周围电路的影响,故将受周围影响的蔡氏电路做了等效处理,并将其等效为电流激励蔡氏电路。这里首次用解析的方法对三阶非线性微分方程能够产生混沌的参数范围进行预测,利用该方法得出电流激励蔡氏电路产生混沌的必要参数条件。通过数值仿真证明了该等效电路具有极其丰富的混沌动力学行为,仿真结果与解析预测结果有较好的吻合性。 相似文献
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Agent协商优化问题的快速混沌遗传算法 总被引:1,自引:0,他引:1
高坚 《微电子学与计算机》2003,20(4):1-2,49
随着Internet的日益完善和电子商务的普及,如何快速、高效地进行Agent协商是我们必须面对和解决的一个重要问题。文章在Bazaar协商模型下,给出了一种快速混沌遗传算法,该算法首先将混沌机制引入遗传算法,并在搜索中,以具有一定保证的当前最优解为中心不断压缩优化变量的搜索区间,对算法进行加速。这样即克服了遗传算法过早收敛的缺点,又解决了引入混沌后遗传算法收敛慢的问题。仿真实验表明,它是解决Agent协商优化问题的一种快速有效算法。 相似文献
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Chaos in electronic circuits 总被引:3,自引:0,他引:3
《Proceedings of the IEEE. Institute of Electrical and Electronics Engineers》1987,75(8):1033-1057
This paper describes three extremely simple electronic circuits in which chaotic phenomena have been observed. The simplicity of the circuits allows one to i) build them easily, ii) confirm the observed phenomena by digital computer simulation, and in some cases iii) rigorously prove the circuit is indeed chaotic. A consequence of i) is that the interested reader can build, and then see and even listen to chaos. It is to be emphasized that these circuits are not analog computers. They are real physical systems. 相似文献