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1.
A new Rosslor hyperchaotic system and its realization with systematic circuit parameter design 总被引:1,自引:0,他引:1
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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
2.
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
3.
In this paper, one-state on-off intermittency and two-state on-off intermittency are generated in two five- dimensional continuum systems respectively. In each system, a two-dimensional subsystem is driven by the Rossler chaotic system. The parameter conditions under which the on-off intermittency occurs are discussed in detail. The statistical property of the intermittency is investigated. It is shown that the distribution of the laminar phase duration time follows a power law with an exponent of -3/2, which is a signature of on-off intermittency. Moreover, the phenomenon of intermingled basins is observed when attractors in the two symmetric invariant subspaces are stable. We provide an effective way to generate on-off intermittency based on a chaotic system, which is important for application and theoretical study. 相似文献
4.
By using the solutions of an auxiliary Lam\'e equation, a direct algebraic method is
proposed to construct the exact solutions of $N$-coupled nonlinear Schr\"{o}dinger
equations. The abundant higher-order exact periodic solutions of a family of
$N$-coupled nonlinear Schr\"{o}dinger equations are explicitly obtained with the aid
of symbolic computation and they include corresponding envelope solitary and shock
wave solutions. 相似文献
5.
By using the theory of cavity QED, we study the system in which a two-level atom interacts with a cavity in the case of large detuning. Through the selective detecting of atomic state, Schrodinger cat states and entangled coherent states are easily generated. When the atom is driven by a weak classical field and the cavity field is in the Schrodinger cat state, we study the conditions of generating the Fock states and the maximal success probability. The maximal success probability in our scheme is larger than the previous one. 相似文献
6.
This paper presents calculating results of the two-dimensional
electron gas (2DEG) distributions in AlGaN/GaN material system by
solving the Schr\"{o}dinger and Poisson equations self-consistently.
Due to high 2DEG density in the AlGaN/GaN heterojunction interface,
the exchange correlation potential should be considered among the
potential energy item of Schr\"{o}dinger equation. Analysis of the
exchange correlation potential is given. The dependencies of the
conduction band edge, 2DEG density on the Al mole fraction are
presented. The polarization fields have strong influence on 2DEG
density in the AlGaN/GaN heterojunction, so the dependency of the
conduction band edge on the polarization is also given. 相似文献
7.
本文提出了一种新颖的有源backstepping控制设计方法用于实现两个相同R?ssler超混沌系统的同步,并进一步将该方法推广到实现Chua混沌系统和R?ssler超混沌系统的广义同步。由于该设计方法在控制器设计的每一步中都能将Lyapunov函数的选择和有源控制器的设计紧密地结合起来考虑,从而能根据工程实际灵活地构造出合适的控制器以满足系统控制要求,同时也为控制器的设计提供了一种系统的设计方法。这正是这种设计方法的最大优点。数值结果表明了本文所提出设计方法的可行性和有效性。 相似文献
8.
9.
An adaptive passive strategy for controlling uncertain
L\"{u} system is proposed. Since the uncertain L\"{u} system is minimum
phase and the uncertain parameters are from a bounded compact set, the
essential conditions are studied by which uncertain L\"{u} system could be
equivalent to a passive system, and the adaptive control law is given. Using
passive theory, the uncertain L\"{u} system could be globally asymptotically
stabilized at different equilibria by the smooth state feedback. 相似文献
10.
This paper presents calculating results of the two-dimensional electron gas (2DEG) distributions in AlGaN/GaN material system by solving the Schroedinger and Poisson equations self-consistently. Due to high 2DEG density in the AlGaN/GaN heterojunction interface, the exchange correlation potential should be considered among the potential energy item of Schroedinger equation. Analysis of the exchange correlation potential is given. The dependencies of the conduction band edge, 2DEG density on the Al mole fraction are presented. The polarization fields have strong influence on 2DEG density in the AlGaN/GaN heterojunction, so the dependency of the conduction band edge on the polarization is also given. 相似文献
11.
Ultraslow optical solitons via electromagnetically induced transparency: a density-matrix approach
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We study the ultraslow optical solitons in a resonant
three-level atomic system via electromagnetically induced
transparency under a density-matrix (DM) approach. The results of
linear and nonlinear optical properties are compared with those
obtained by using an amplitude variable (AV) approach. It is found
that the results for both approaches are the same in the linear
regime if the corresponding relations between the
population-coherence decay rates in the DM approach and the
energy-level decay rates in the AV approach are appropriately
imposed. However, in the nonlinear regime there is a small
difference for the self-phase modulation coefficient of the
nonlinear Schr\"{o}dinger equation that governs the time evolution
of probe pulse envelope. All analytical predicts are checked by
numerical simulations. 相似文献
12.
无标度区间是时间序列在统计意义上存在分形自相似性的尺度范围,是交通流多重分形特征研究中的重要组成部分.为解决交通流多重分形研究中多重分形去趋势波动分析法(multi-fractal detrended fluctuation analysis,MF-DFA)缺乏有效识别无标度区间方法的问题,本文在分析算法过程中交通流波动函数对数曲线突变点性质的基础上,结合传统无标度区间识别方法的构建思想,建立基于MF-DFA算法的无标度区间自动识别方法.以北京市二环快速路外环方向的部分道路为例开展实例研究,通过与传统无标度区间识别方法的结果对比,验证新方法的有效性.研究结果表明:本文方法能自动识别交通流多重分形无标度区间,且稳定性好;案例研究可知交通流短时间内波动较小、自相似性较强,随着研究时间段变长、交通流波动逐渐变大,自相似性逐渐消失,进一步解释了交通流无标度区间的有限性. 相似文献
13.
Hawking radiation as tunnelling from arbitrarily dimensional Reissner-Nordstrom de Sitter black hole
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This paper extends Parikh-Wilzcek's recent work, which treats the Hawking radiation as a semi-classical tunnelling process from the event horizon of four dimensional Schwarzshild and Reissner-Nordstrom black holes, to that of arbitrarily dimensional Reissner-Nordstrom de Sitter black hole. The result shows that the tunnelling rate is related to the change of Bekenstein-Hawking entropy and the factually radiant spectrum is no longer precisely thermal after taking the dynamical black hole background and energy conservation into account, but is consistent with the underlying unitary theory and then satisfies the first law of the black hole thermodynamics. Meanwhile, in Parikh-Wilzcek's framework, this paper points out that the information conservation is only suitable for the reversible process but in highly unstable evaporating black hole (irreversible process) the information loss is possible. 相似文献
14.
We investigate the one-dimensional
nonlinear Schrödinger equation with a perturbation of polynomial
type. The approximate symmetries and approximate symmetry reduction
equations are obtained with the approximate symmetry perturbation
theory. 相似文献
15.
The internal modes of incoherent vector solitons (IVSs) in
photovoltaic photorefractive materials are investigated in the
framework of coupled nonlinear Schr\"{o}dinger equations. It is found
that there is a pair of internal modes corresponding to a
bright--bright IVS. The propagation dynamics of the bright-bright IVS
perturbed by the internal modes is simulated by numerical method. 相似文献
16.
The framework of detecting the image edge based on the sub-pixel multi-fractal measure (SPMM) is presented. The measure is defined, which gives the sub-pixel local distribution of the image gradient. The more precise singularity exponent of every pixel can be obtained by performing the SPMM analysis on the image. Using the singularity exponents and the multi-fractal spectrum of the image, the image can be segmented into a series of sets with different singularity exponents, thus the image edge can be detected automatically and easily. The simulation results show that the SPMM has higher quality factor in the image edge detection. 相似文献
17.
Pseudospectral method with symplectic algorithm for the solution of time-dependent SchrSdinger equations
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A pseudospectral method with symplectic algorithm for the solution of time-dependent Schrodinger equations (TDSE) is introduced. The spatial part of the wavefunction is discretized into sparse grid by pseudospectral method and the time evolution is given in symplectic scheme. This method allows us to obtain a highly accurate and stable solution of TDSE. The effectiveness and efficiency of this method is demonstrated by the high-order harmonic spectra of one-dimensional atom in strong laser field as compared with previously published work. The influence of the additional static electric field is also investigated. 相似文献
18.
In this paper, we applied multifractal modeling techniques to analyze the traffic data collected from the Beijing Yuquanying. The results indicated that multifractal characteristics obviously exist in the traffic system; the degree of fractality of these traffic data tends to increase as the traffic system becomes congested; the Hölder exponent that measures the local rate of fractality may be used as indicators to predict the presence of the traffic congestion. 相似文献
19.
Based on the exact solution of the time-dependent Schr\"{o}dinger
equation for two-species Bose--Einstein condensates (BECs)
consisting of two hyperfine states of the atoms coupled by a tuned
adiabatic and time-varying Raman coupling, we obtain analytically
the entanglement dynamics of the system with various initial
states, particularly the SU(2) coherent state, for both of
cases with and without the nonlinear interactions. It is shown
that the effect of nonlinear interaction on the entanglement
appears only in a longer time period depending on the BEC
parameters. 相似文献
20.
The coupled nonlinear Schodinger equations (CNLSEs) of two symmetrical optical fibres are nonintegrable, however the transformed CNLSEs have integrability. Integrability of the transformed CNLSEs is proved by the Hamilton dynamics theory and Galilei transform. Making use of a transform for CNLSEs and using the ansatz with Jacobi elliptic function form, this paper obtains the exact optical pulse solutions. 相似文献