Based on principle of protection a point and a line on the ground,this paper puts forward the principle of similar ellipse method to design coal pillar for protection of buildings,and the method and step are proposed.

Investigation on the Ellipsometry Used to Anodic Stripping Voltammetry for the Detection of Copper;

The results obtained from in situ ellipsometry experiment manifest that the type of the oscillations of the ellipsometric parameters does not change when rare earth salts are added in anodizing solution, while the period and amplitude of the oscillations are affected.

A series of solutions with copper ions are researched and analyzed by ellipsometry used to chronopotentimeytry.

Based on the Warren-Root model,the mathematical models for wells with finite conductivity vertical fractures in low-permeability reservoirs were developed using the mass conservation law and elliptical flow method,considering the influences of threshold pressure gradient.

The multiple scales method of Kuzmak-Luke was used to obtain the asymptotic solutions of pendulum with slowly varying length, and the solutions were compared with the results of KBM and elliptic KB methods.