The article introduced one kind of new project building material——biological modelling crack from cicatrization concretes, this material characteristic, function, when the concretes material presents the crack the partial fluid core textile fiber or the capsule burst, cohere the liquid flow to leave the permeating crack, coheres the fluid to be possible to cause the concretes to recover the sum.

partly over-burning;the high grade of the inclusions,the network of the primary ferrite in the quenching structure and the small transition radius of the screw thread slot are also the reasons for the rupture.

This paper analyzes and discusses the partial overheating problem affecting normal operation of Primary evaporator' s heater from the aspects of reasons and harmfulness, and proposes the corresponding control countermeasures.

In this dissertation, a research is made not only on the 3D steady and transient eddy current fields in large transformers,but also on stray losses, the local overheating as well as the mechanical strength of structures after the occurrence of sudden short circuit, using electromagnetic theory and modern numerical methods.