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。

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EuMore than 80 people have died across Europe as days of snow storms and sub-zero temperatures swept the continent, causing traffic chaos for millions.

席卷欧洲数日的暴风雪和零下低温造成超过80人死亡，数百万起交通混乱。

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In this paper, we study weakly chaos on sub-shift of symbol dynamical system, and give a weakly chaotic sub-shift whose topological entropy is zero.

本文讨论了符号动力系统子移位的弱混沌，并得到拓扑熵为零的弱混沌子移位。

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