The structure of Changdu power grid and the process of frequency oscillation accident are summed up,it is analyzed theoretically that the reason of the system oscillation is the ferromagnetic saturation of TV,low-frequency load reduction scheme for Changdu power grid is also analyzed,and the method against misoperation of low-frequency load reduction is put forward.

Relation between serum level of sexual hormone and heart rate turbulence in senile women with coronary heart disease;

Effect of percutaneous coronary intervention on late heart rate turbulence in patients with acute myocardial ischemia;

Clinical study on heart rate turbulence in patients with silent myocardial ischemia;

Turbulence onset(TO) and turbulence slope(TS) were calculated and analyzed.

Methods To test 66 of ventricular tachycardia patients and 48 normal persons with 24h dynamic cardiogram(DCG),calculate and analyze turbulence onset(TO) and turbulence slope (TS).

24h Holter data of subjects were collected and processed to obtain the values of turbulence onset(TO),turbulence slope(TS) and turbulence timing(TT).

The paper is begun with analyzing the oscillatory condition A·F·>1, and the oscillatory frequency is worked out based on the phase balance condition  A+ F=2nπ.

If we introduce the ladder-shaped circuit simple in good time,the oscillating frequency and oscillating condition of RC phase shift oscillating can be w.