Finally the existence of the limit cycle is obtained by using the stability theory of the weak focus.

最后根据细焦点的稳定性判断出极限环的存在性。

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To compensate for this effect, a method is proposed in which velocity feedback signal is added to the original controller to reduce the limit cycle amplitude.

为补偿间隙的影响，本文提出了在不改变原有的控制器基础上，通过引入速度反馈而减小间隙极限环的方法。

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Both theoretical and experimental analyses are performed to investigate the limit cycle flutter bifurcation of a sweepback wing with an external store in the tip of the wing.

从理论及实验两方面，研究了带外挂后掠机翼的极限环颤振分叉现象，得到了稳定、半稳定及不稳定极限环。

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Other short term suggestions include the introduction of 20mph speed limit zones and wider cycle lanes.

BBC: Twin Sails bridge

Furthermore, any limit on deficits should take into account the economic cycle.

ECONOMIST: Britain's public finances

And according to the Planetary Boundaries concept, the nitrogen cycle is already one of the places where humanity has already broken through the "safe limit".

BBC: Food: Organic growth?