New repairing technology of oil cylinder movable column;

The processing principle of processing tools on the movable column surface,ball bearing ceremony,roll columniation ceremony,taper roll son ceremony and engine idler wheel ceremony,parameter preference,account of roll power,structure designs,etc.

The paper stated the status of the hydraulic single props used in coal mining faces at home and broad The paper provided the existing problems in the technical structure and principle of the piston hydraulic single prop The paper also provided a view on a development of new and environment hydraulic single pro

Discussion on the rational form of conical structure and the rationality of designing the cone on the cylinder for ice force condition;

Heat effect on vortex shedding frequency spectrum on heated circular cylinder in liquid cross flow;

A line dipole-at-the-center model for two infinitely long dielectric cylinders in a uniform field is proposed.

At first,this paper pointed out a technique of solution about cylinder’s equation of projection on the flat surface,and also received cylindrical body to sunrrounded projective cylinder,and also pointed out a technique of solution about the projective region of space geometric form on the flat surface.