By cutting experiments and analysing the results for flat picks,cutting performances of the pick are studied.

The effect of several porameters on cutting performance are analysed on the basis of experiment results.

Installations and methods measuring rock two cutting performancd indexesd under laboratory are introduced in the paper ,their distinguishing features are analyzed,which can direct us to measure properly rock cutting performances.

Research of the cutoff characteristic of the dominant mode inridge-trough waveguides;

Type design and sectional characteristic calculation of closed profiled steel sheeting;

Based on basic principles of grillage method,an improved grillage model of wide cantilevers bridge deck is brought forth and its effectiveness is verified after generalizing rules of grillage meshing and sectional characteristic.

In order to find a more effective method monitoring chemical and biochemical reaction timely for planar optical waveguides, the more intuitionistic cut-off characteristic of three-layer and four-layer planar optical waveguides is studied.

In order to use the cut-off characteristic of planar optical waveguides for monitoring chemical and biochemical reaction timely, we present an detail theoretical analysis of three-layer and four-layer waveguids.

First, in order to find a more effective method monitoring biochemical reaction timely for planar waveguides, the more intuitionistic cut-off characteristic of three-layer and four-layer planar waveguides is studied.