The Analysis of Distribution of the Chromosome Aberration Breakpoints from Medical Diagnostic X-ray Workers;

Through the analysis of factors which will effect breaking location of tensile testing of helical welding pipe,this article indicates breakpoint of tensile test shall locate in middle of sample gauge length,and also introduce the method to avoid breakpoint deviating the middle of gauge length.

Regions consist of equal region and nub region and equal region can be divided with the methods of Taisen triangle, trend surface, clustering and so on; The track of boundary points of nub regions is a circularity and nub region can be divided with the model of breakpoints combined with exercising on map.

Approach on break crossover point diastrophism direction of break coal intersecting line drawing in complex structure area;

In this article it defines the 11 main city s attractived region respectively by the theory of space in teraction and using the method of balance point of attractive scope according to the strength of every city in Hebei province.