Equal energy,equal deformation tamping and expansion gangue pile is a new strengthening method,which not only has the effect of tamping and expansion,but also strengthens complex earth-fill.

Flow stress characteristics of isothermal deformation at high temperature for 7075 aluminum alloy;

By isothermal deformation of as-cast Ti-6Al-4V (ZTC4) at different plastic technologic parameter,the regulations of deformation stress-strain and microstructure deformed have been obtained.

An effective method for grain refining of γ-TiAl alloy was put forward based on the study results of compression behavior and microstructure evolution during isothermal deformation.

The key problem in the numerical simulation is how to transform the given peening parameters into the equivalent nodal forces, which is solved by the equivalent deformation method proposed by the author.

The problem of isometric deformation of surface with constant principal curvatures was studied by O.

In this paper, we mainly study the isometric deformation preserving principal curvature of surfaces in Minkowski space R_(1)~3 .

Let M\ be a timelike surface in \L\+4\with the parallel mean curvature direction, which admits isometric deformation preserving mean curvature.

But I only ask the limit from the sequence limit in view of the sequence limit primary distortion,to change into the known limit,two with the primary transformation clamp the theorem,the conclusion principle,the definite integral law,the monotonous principle,series expansion,rip the sincere this formula and so on several kinds to ask the law to narrate sequence limit several kinds to ask the law.

Application of identical transformation in solving mathematical questions were introduced and briefed.

This paper studies the application of identical transformation trigonometric function in indefinite integral,and hopes that it may bring some help to students in this aspect.