引入一种新的扩展小扰动稳定域的概念，以弥补原有小扰动稳定域无法考虑电力系统(超)低频振荡的不足。

A new type of extended small signal stability region (E-SSSR) is presented so that it can consider the low frequency oscillation phenomena captured in power system operations.

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简单介绍我国重力场测量卫星的高精度K波段星间测距系统的概念和其关键部分超稳定晶体振荡器的概念。

The concept of KBR System main structure used in the gravity field measurement in China and the key technologies of USO is introduced.

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