Research on organization system of promoting energy efficiency retrofit of existing residential buildings in northern heating areas;

Construction of state-owned capital operation budget organization system;

Construction and interface management based on research and development organization system of big enterprises of autonomous innovation;

On the basis of study nondestructive detecting samples of spheroidal graphite cast iron using sonic resonant method, nodularity and matrix structure of ductile iron camshafts have been further in-vestigated in this paper.

Effect of nitrogen on matrix structure of 3 different varieties of gray cast iron.

This paper analyses the distribution of matrix structure in as-cast ductile iron crankshaft;expounds the basic principle of electro-magnetic test of ductile iron matrix, and the make-up,the transducer technology and the software design of the testing system, and briefly explains the testing method.

Moreover,it provides reliable theoretical basis for detecting the structure of ductile iron by the electromagnetic method in order to realize the nondestructive detection of the matrix of as-cast ductile iron.

Influence of matrix microstructure on fatigue strength of ductile iron;

The effects of matrix microstructure on wear properties of high-speed steel(HSS) with high vanadium content were studied using pin-on-ring tester,and the failure behaviors were investigated via SEM.