The strucutral charateristics and mechanism of percolation stability of a directional blasted dam are analayzed and investigated, the antiseep principle of directional blasted dam is put forward, the proposals on constructing a retaining dam at a suitable site according to the excellent percolation stabilidy of directional blasted dam are given.

Around the problem of the cracks shown on the outside thermal insulating layer of the outside wall,this essay is putting forward the controlling principle of the cracks control of the outside thermal insulating layer of the outside wall with "the progressive and soft release stress layer for layer "by the analysis from such aspects as the structure,materials and construction.

Function disposition and control principle of security and stability control system for Guangdong power grid;

Based on the main performance of automobile in variant driving speed rangs, puts forward the different ASR control principles and the control approaches.

This paper quested the systematic engineering characteristics and control principles in 7th Traditional Sports Game of National Minorities by the methods of literature and and experts interview, in order to provide some references for having continuously the Iraditonal sports game of minorities and some other sports events.