The effects of number and size of elements in the contact area in the steady stage of a rolling process as well as the initial velocity of the plate on the finite element analysis were analyzed and reasonable simulation parameters in a rolling process with FEM were attained, which was used to analyze the rolling force regularity of medium plat rolling in one steel work.

The program indicates that the initial velocity is a variable.

Resorting to Runge-kutta method to solve the simply supported axial pre-statically loaded bar s buckling impulse under the half-sin impact load, this paper is to probe into the relationship between buckling impulse, and pre-static load, impact load, initial deflection, initial velocity respectively.

This paper is to analyze various forms of emulsion and mixture as well as their interaction,and talks about the effect of aggregate and various additives on emulsifying speed of cation-emulsified pitch and the earlier strength of mixture in accordance with the theory of charge.

The initial velocity field is more close to the last velocit.

The effect of pressure differences on the initial acceleration of flow,the mean axial velocity component w_m,the flow rate q,the distance of reattachment point z and so on have been discussed.

Deducing from the dynamic equations of the inner detonation loaded cylindrical wall, along with Taylor s complete fracture law of the cylindrical tube, we get the mathematical expressions of the fracture strain ,the fracture radius,the mean fracture time and the initial velocity of the fragments.