The first is the idea of the enfeoffment existing universally in the society.

This policy found its expression in offering positions nominally,changing enfeoffment consequently,limiting imperial clansmen’s having an audience with the emperor,imperial clansmen’s taking office was strictly forbidden and they must be watched closely,etc.

The differential vacuum seal for the vertical scanner is calculated and designed in this article,the result show that the vertical scanner has the feature of non-friction and very little gas leakage, hence which can satisfy the high vacuum need and metal contaminated need for the chamber in the wafer process.

Combining VB and Fortran with APDL(redevelopment tool of ANSYS),the pre- and post-processing program for the data exchange in the transient sealing analysis program for flange sealing system of nuclear pressure vessel has been developed.

Since there are problems of small solving scale and low calculating efficiency in the selfdeveloped program for 3D sealing analysis for nuclear pressure vessel, the improving method on structure and function of the program are presented.

A concurrency control mechanism of extended delamination locking based on2PL is presented,which can support the requirement of engineering cooperation design transaction and improve the concurrency degree of transaction.