讨论了雷云对地放电过程中的雷电流的特性，解释了非周期雷电流产生的电磁场的特性，并用一个雷电流实例进行了分析说明。

The feature of electromagnetic wave produced on discharge process from thundercloud to ground is discussed. A non-cycle lightning current model is built to explain it.

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提示出非稳定周期轨道在神经不规则放电节律的动力学之中起着重要作用。

These results suggest that the UPO play an important role in the dynamics of the irregular firing pattern of neuron's discharge.

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在此基础上，进一步对阵发放电的非稳定周期轨道分级进行了初步研究，检测到了显著的周期2与周期3轨道。

We also detected the orbits with higher periods, and highly significant unstable period 2 and period 3 orbits were identified.

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