unstable structure

During the period, many kinds of problems occur frequently, and the social structure is extremely unstable.

这一时期属社会问题多发期 、 社会结构最不稳定期.

This paper presents the stability limits prediction by sensitivity based BCU method using network structure preserving model. The main feature is that it does not rely on the assumption that the controlling unstable equilibrium point does not change when the operation parameter changes.

阐述了电力系统结构保持模型下基于灵敏度的BCU方法，其显著特征是当运行参量变化时不依赖于主导不稳定平衡点不变的假设。

Relying on the model, the unstable influence of the structure resonance is eliminated with an incomplete differential PID control algorithm. The control bandwidth can surpass its structure resonance frequency and wide bandwidth control can be realized through applying linear power amplifier.

依据模型，以不完全微分PID控制算法来消除结构谐振的不稳定影响，采用线性功率放大驱动方式，可使控制带宽超过其结构谐振频率，实现高带宽控制。

A two-degree-of-freedom control structure is proposed for unstable chemical and industrial processes with time delay.

针对化工不稳定时滞过程,提出一种两 自由度 控制结构.

The age structure of most dominant species community is declining, and the community species composition unstable.

样地内多数优势种群的年龄结构为衰退型, 群落的种类组成不稳定.