混沌

First, the problem of stabilizing a given periodic orbit in a chaotic system is discussed. Then, a method for the stabilization of an unstable focus point is presented, which does not require the location of the focus point. At last, a method for the synchronization of chaotic systems using neural networks is proposed.

首先给出了使系统稳定在某个给定的周期轨道上的方法；接着讨论了如何使系统稳定在某个事先未知的不动点上；最后，提出了一种基于神经网络的混沌系统的同步化方法。

Sometimes it is difficult to predict and calculate the periodic orbit, so the chaotic control technology based on Washout filter is used to control chaotic phenomena of DC/DC converter.

针对上述不足，本文采用了Washout滤波器来控制DC/DC变换器中的混沌现象，仿真结果证明了该方法的有效性。

This paper investigates the orbits of sub-harmonic and chaos in power system under periodic and quasi-periodic perturbation .

研究了电力系统在周期和准周期扰动下的次谐和混沌轨道。

Furthermore, the periodicity of the phenomena and the route from bifurcation to chaos are also investigated in detail.

同时，详细研究了系统由分岔到混沌的发展过程。

The output chaotic sequence through the perturbation function distributes uniformly in the whole state space.

经过扰动函数的输出混沌序列均匀分布在整个状态空间中。

An active control method for synchronization of two uncertain chaotic systems with parameter perturbation is presented.

利用主动控制思想实现了两个具有未知参数干扰的不确定混沌系统的同步。

Simulation results show that the chaotic system can be controlled effectively in Buck power converter by this method. The method is still effective when there are parameter perturbation and noise.

数值仿真结果表明：该方法能有效地实现Buck功率变换器混沌系统的控制，系统在参数发生摄动和存在噪声的情况下，控制仍然有效。

The perturbation signals were embedded in a chaotic attractor on the inputs of parameter perturbation model.

用该扰动信号，将嵌入在混沌吸引子中不稳定周期轨道镇定到稳定的不动点处。

Fourth, we have developed a new hybrid control strategy by combining state feedback and parameter perturbation for controlling period-doubling bifurcations and chaos in discrete nonlinear dynamical systems.

4提出了参数调节和状态反馈的混合控制新方法，有效地实现了离散非线性系统的倍周期分岔控制和混沌控制。

The simulation results show that the proposed approach can effectively eliminate the disruption of perturbation.

该方法能克服不确定性对混沌系统同步的破坏，实现了良好的同步效果。

Breath, muscle contraction of the buttocks; arch body, as far as possible to hold his head, right leg straight towards the ceiling (peg-leg knee in order to avoid muscle tension).

呼气，收缩臀部肌肉；拱起身体，尽量抬起头来，右腿伸直朝向天花板（膝微屈，以避免肌肉紧张）。

The cost of moving grain food products was unchanged from May, but year over year are up 8%.

粮食产品的运输费用与5月份相比没有变化，但却比去年同期高8％。