Methods Based on the law of conversation of energy,variational principle was used to derive the homogeneous soil′s sliding trace,sliding velocity,and sliding distance equation under the condition of having and not having pore water pressure respectively.

Through the transformation of sliding guideway,cylinder size and structure,rolling width,driveshaft structure and other parts of the equipment,it has become more rational and had a larger range of production so as to reduce the cost and error rate and extend its service life.

This paper presents a improved aspect mining approach based on event traces,which investigates for recurring method patterns in the method call traces b.