A definition on steady-state stability for PWM systems is given and it is proved that many applied proportional PWM systems in the industrial controlled process are with steady-state stability.

The steady-state stability of the system is defined and proved under the condition of variable sampling timelike interval, which is also applied to pluse-width-modulated control system of aptotic sampling period.

Study shows that the reactivity of 4,5-dihydroxyisoquinoline is similar to that of the active antioxidant 1,8-naphthalenediol(DIOL),but the former has greater gas stability than that of the latter.

Controlling pattern for dynamic stability of system “Roof-Support-Floor”;

Developments in the vibration,dynamic stability and control research of circular saw——the controlling technology of dynamic stability of circular saws;

Research on the influence of generators based on detailed excitation system models and paramenters to power grid dynamic stability;

The predominant findings are: the overstability below the minimum undercooling spacing of eutectic coupled growth,zigzag bifurcation in bulk lamellar eutectic coupled growth,influences of fluxion in melts and nonlinear dynamics upon the morphological instabilities of coupled growth,and morphological stability of isothermal and non-isothermal .

The effects of thermosolutal convection on morphological stability were studied during Al/AlLi eutectic growth subjected to vertically upward directional solidification of two hypoeutectic Al-Li alloys.

In the present work, morphological stability of globular crystal was experimentally studied using a succinonitrile-5%H_2O (molar fraction) transparent alloy under different undercoolings and stirring rates.