Precise cutting of copper and aluminum sheets is a systematic work with the cutting toolings and machines as the most important factors.

Based on form-finding of the force density method,load analysis of the nonlinear finite element method and geodesic line cutting method,this paper summarizes some outlines in the design and construction of membrane structures.

Discussion of titanium mesh cutting technique in anterior cervical corpectomy surgery;

The author analyzes the mechanical theory of guillotine level blade and oblique blade cutting and the calculating methods of the two different cutting style, moreover, calculating formulas of level blade and oblique blade cutting force are deduced at last, the author recommend a blade obliquity of guillotine.

This paper presents a type of dual CPU system of chip microcomputer based on the requirements of real-time performance and reliability for some complex-important system, introduces the design concept and the warning system of this system, expounds the unique arbitrary switch-over between the two CPUs, the self-detection for the faults, and synchronous control, etc.

Data subset is more important cycle of data producing,and is a processing that needs much time.