The influence of the factors,including the area density,the impact velocity of the fragment and the impact model,on the ballistic performance was studied.

The relation between the mass efficiency and the impact velocity, and the relation between the thickness efficiency and the impact velocity were studied.

Study on injection rate of third level formation with polymer flooding in Daqing Oilfield.;

Selection of the rational injection rate for reservoir with polymer flooding;

This paper uses reservoir numerical simulation method to study the effect of injection rate on the displacement efficiency of polymer flooding and analyzes the reason of the effect.

Set feeding trajectory and infeeding speed as multiple target functions and take horizontal distance and vertical distance between feeding roller and fast roller, rotational speed and diameter of feeding roller and inclined angle between the fast roller and slow roller as design parameters, Particle Swarm algorithms and MATLAB were used in the optimization design of roller mill.

For an ordinary operator,it is comparatively studied that how quick inputting speed of Chinese characters may be acquired with phonetic coding,shape coding and combining coding of phonetie,and how difficult for him to learn the three kinds of coding in this experiment.