The trajectory optimization,permissible crooked wellhole radius,relative error analysis of the build-up rate,the true build-up rate analysis and PDM optimization are applied in Well TK818CH practice,which has ac.

The design of the Decorative Stainless-Steel Elbow, the calculation of the thinnest thickness of the elbow wall, and the calculation of the smallest relative bending radius of the elbow, the forming die for the elbow and the attention items in the design of the die were introduced.

The strained lattice parameters, misorientation, bending radius and stress of ZnO films were estimated.

Experiments of single mode fiber bend loss with the change of bend radius from 1 to 9 mm are made at 90° and 180°respectively.

Based on field data of the river bend in middle and lower Hanjiang River and in Jingjiang River,the relation between the variation of bend radius of flow dynamic axis and bend bypassing and shoal cutting is expounded.

Through analyzing and arranging the actual data measured of mountain area rivers in southwest of China,we summarize:The ideal channel flow route should have sine derivative curve flow route,harmonized flow direction,good flow route corner and bigger curve radius.