极限环

By using the theorem of Perron and the method of Frommer, qualitative analysis of the Cohen-Grossberg neural network is carried out.

本文对Cohen—Grossberg神经网络进行了定性分析，研究了极限环问题和平衡点附近的轨线分布。

For the Phenix Reactor noise data, the third-order system is identified and by this way it is able to study its stability.

将建模方法推广到其它领域时，得出太阳黑子数据中的极限环特征，而其频谱特征与原序列的频谱特征一致。

This thesis is devoted to the problems of integral conditions, center -focus determination and bifurcation of limit cycles at degeneratesingular point and the infinity of planar polynomial differential system.

本文主要研究平面多项式微分系统退化奇点与无穷远点的可积条件以及中心焦点判定与极限环分支，全文由七章组成。

In Chapter 4, we study the center conditions and the bifurcation of limit cycles at a degenerate singular point as well as that at infinity for a quintic polynomial system and prove that the system has 5 limit cycles around the origin and 2 limit cycles around infinity.

在第三章中，我们分别研究了一类三次多项式系统、一类五次多项式系统、一类七次多项式无穷远点的中心条件与极限环分支问题。

The quantization error is corrected in PWM module so that it will not propagate to the output directly. The theoretical analysis is verified by simulation and circuit experiment.

通过对一个DSP控制的开关频率达100KHz的DC/DC变换器进行试验，证实其输出精度未因极限环的影响而降级。

Thirdly, the Hopf bifurcation of the self-excited vibration model with moving boundaries is considered.

研究了具有运动边界的自激振动模型的Hopf分叉问题，从系统自激振动的极限环生成和消亡的过程可发现：系统在边界的运动速率变化时能够发生一阶超临界Hopf分叉。

Through studying the singular points of the plane differential systems, the sufficient conditions of the nonexistence of limit cycle for the system are obtained by means of comparing theorem, analyzing divergence and change of variable.

通过对微分系统的奇点进行研究，借助比较定理，将该方程与其对称的方程进行比较，并通过分析散度和变量代换的定性分析，得到了其极限环不存在的充分条件。

In Chapter 2, by studying the computation of the quantities of singular point of the original of the following complex autonomous polynomial differential system

在第一章，我们对平面多项式微分系统的中心焦点判定与赤道极限环分支问题研究的历史背景与现状进行了全面综述。

Simulation shows that joints movement convergence to stable limit cycles,planned walking pattern is realized,and feasibility of the proposed method is verified.

实验表明规划步态收敛于稳定的极限环，实现了高速动态步行，该规划方法是可行的。

The stability of system equilibrium point and the existence condition of 3-D Hopf bifurcation as well as the stability of hence generated periodic solution were analyzed, so that the existence of limit cycles on the two-dimensional stable manifold of one microbial species and its nutrition was verified when other one had the disadvantage in the competition so as to become extinct.

研究当营养消耗率δ1＝δ1为一般的非减连续函数和δ2＝常数的三维Chemostat模型，分析系统平衡点的稳定性，三维系统经历Hopf分支的条件和由此产生的周期解的德定性，证明系统中某一微生物物种处于竞争劣势而趋于灭绝时另一微生物物种和营养的二维稳定流形上极限环的存在性。

With Death guitarist Schuldiner adopting vocal duties, the band made a major impact on the scene.

随着死亡的吉他手Schuldiner接受主唱的职务，乐队在现实中树立了重要的影响。

But he could still end up breakfasting on Swiss-government issue muesli because all six are accused of nicking around 45 million pounds they should have paid to FIFA.

不过他最后仍有可能沦为瑞士政府&议事餐桌&上的一道早餐，因为这所有六个人都被指控把本应支付给国际足联的大约4500万英镑骗了个精光。