To enrich the field detecting methods which are used to detect the strength of the concrete in structures, we apply the stipulated test method (lateral split method), which was put forward by Robins in 1980 to grade rocks strength, to the field detecting on the concrete in structures.

The results show that the nominal transverse cutting strength of concrete core is gradually reduced and the nominal transverse cutting strength of new concrete sample is gradually reduced and tends to stability at last with increasing time of erosion.

Uniform expressions for the diffracted currents on the wedge surface for the MM-PO technique;

Control of chaos in a delayed feedback semiconductor laser via dual-wedges;

The improved MoM-PO technique is validated by comparison with exact solutions for a right-angled perfectly conducting wedge at normal incidence.

Based on the characteristics in the strength of coal seam under the action of the ground pressure, the impact coal cutting is achieved in the coal winning technique by using the impact cutting tool to impact, split and cut the coal on the coal wall.

To the cracks on the bottom of the slabs,the effect of water is just like the uniform forces assigned on the crack face which lead to the cracks to split.

Plain high strength concr ete and plain normal strength concrete,fiber high strength concrete and fiber no rmal strength concrete were tested respectively with split test and their capaci ty to resist propagation of.

Several suggestionsto improve the method of testing cleavage strength were presented.

Based on stress analysis of soil mass in the course of cleavage grouting,the cleavage type of different kinds of soil mass is discussed in this paper.