The paper introduces how to build a large MAN with linear subnets, and studies the problem of extending the linear subnet, which deals with an arithmetic, used for determine whether to extend to linear subnet or not, and a method to carry out the extending of the linear subnet.

Design of rotor profile of lobe pump and its property analysis;

Optimized design for rotor profile of screw compressor;

Four kinds of rotor profile performances of dry screw vacuum pumps are compared,which are the profile of double sides and symmetrical circle,si ngle-thread and variable pitch trapezium,constant-pitch trapezium and const ant-pitch concave tooth.

A new study on Λ splitting of electronic states of linear molecules;

Establish model of stator profile for the new type of two-acting roller rotary pump,analysis the movement characteristics on different profiles,derive the boundary condition of the transitional curve and the computational method of eighth-power curve.