The principles implied in the process of EFP(explosively formed projectile) impacting the plate covered explosive and the ceramic composite armor have provided the evidence for calculating the residual velocity of EFP(explosive formed projectile) impacting a new integrated armor,and a calculation model has been induced.

Study on the determination of residual strength for expansive soil;

The result shows that the installation of bolts can effectively enhance the peak and residual strength of the bolted rock body and that bolts strengthen the strength of residual of the rock body more than they do the strength of its peak Moreover,with the increase of t.

By the simulation test, it is proved that the function of rock bolt is to raise the residual strength of broken surrounding rock around roadway, and the broken surrounding rock is made into a reinforced arch.

The Research on the Best Coagulative GT Value of High Turbidity Water(Part Ⅱ )- Taking the residual turbidity of clarified water as a standard;

By means of the method of stalic tests of settling this paper takes the residual turbidity of clarified water as an index to study the best coagula-tive GT value of common mine water, Which' s turbidity is equal to or less than 400 degrees.

By means of the method of static tests of precipitation this paper takes the residual turbidity of clarified water as a standard to study experimentally and theoretically the best coagulative GT value of low turbid water, which s concentration is equal to or more than 1kg/m3.

Based on this, we developed stick corrosion inhbitor CT2 - 14, gas - liquid phase corrision inhibitor CT2 -15, and the analysis technology of corrosion inhibitors residual concentration.

The article introduces a kind of quantitative analysis method, which is used in monitoring the residual concentration of corrosion inhibitor in gasfield brines.