The characteristic of shaped charge with jetting projectiles formed by two types of liner structure and their penetration capability to concrete were studied by X-ray flash radiographs and penetration effect test.

According to the hydraulic transmission principle, a device for fabricating large cone angle near-field optical fiber probe by means of dynamic chemical etching is developed.

Optimum design of large cone angle thrust tapered roller bearings for rolling mills has been firstly introduced in this paper, together with systematic analysis of bearing internal force, roller contact stress,large rib taper face types and rib strength calculation of inner ring.

For processing specificity of big cone angle with exceeding5 degrees,the tests were repeatedly conducted so as to explore feasible processing technology.

And finite element analysis of the big cone angle skew bevel gears about multi-tooth meshing situation and bearing capacity was accomplished by using this software\'s related function,which paved the way for related personnel’s further study.

Microstructure of hollow microcone-shaped carbon fibers;