How to distinguish the stability of closed loop system is analyzed and expounded when pole zero cancellation takes place in the open loop transfer function,and methods of distinguishing the stability of closed loop system under various situations of open loop pole zero cancellation are provided.

The distribution of zero-pole and settling performance of the OTA are analyzed.

The other methods include: The conventional method of spectrogram parameters, the zero-pole model and the fractal method, the latter two were proposed by the present authors before.

Through reform,exploratory and practice for many years,basic viewpoint of new framework is proposed,definition of zero-pole in linear time invariant(LTI) system is standardized,and uniform framework of LTI system and organic combination of classic and modern control theories are constructed.

Method Four characteristic extraction methods, the conventional method of spectrogram parameters, the zero pole model, the fractal analysis method and the Teager energy method, were used to analyze Doppler signals from carotid blood flow.

It gives the relation between the zero pole and the main parameters of resonance circuit and develops conclusions which will be valuable for related researches.

By deriving limiting zero point of the equation,some sufficient conditions that guarantee the existence and uniqueness of traveling wave solution of this equation are obtained.