By researching both the thickness deformation law of the ring with stepped cross sections rolled from the ring with rectangular cross sections and the shrinking-drawing between active and passive deforming parts of the ring, a new concept of compound shrinking-drawing coefficient is proposed and its calculation formula and scope of numeral value .

Based on comprehensiveness analysis and calculation on data from blasting experiments including blasting crater, incline bench, different distance of hole,initiation in multi-row and same stage, optimization of blasting parameters such as distance of hole bottom, minimum burden, explosive consumption an unit etc.

This paper is based on CAXA automatic programming software,By taking the processing of Pump lid curve step surface as the example,We analyze and study the plane outline processing method,the parametric processing method, the planar region processing method and the automatic region processing method,finally proposed the preferred plan for these step surface NC machining.

The dissociative adsorption properties for H2 on Pd(510) step surface show the role of the step is that the direct nonactivated dissociative pathes are formed under the step, the nonactiv.