Analysis on design theory of deformation-control pile foundation;

Concept and design theory of groundwater reservoir;

This paper deals with the theoretic design pr ocess, methods and procedures of machine tools' step speed drive system.

This paper introduces the traction drive s principle, characteristics and theory of design, and discusses thesuitable shape of the rollers for the traction drive, thus developed a constant velocity servo -- mechanism using tractiondrive, and obtained the requiting high accuracy.

By analyzing the process of separation of seed dielectric separator, this paper presents the theory of design of the roll of seed dielectric separator for feeding seeds according to the requirements for seed dielectric separation to feeding seeds, and shows the method of the design of seriation of the rolls for feeding seeds by analyzing the size and shape of seeds.