This scene construction system realized complete alignment and reliable fusion of virtual robot model and real scene of space cabin by constructing high performance architecture, using fast and precise calibration and registration method and designing multi-layer occlusion detecting algorithm.

The paper introduces how to select coal plow in accordance with measuring cutting resistance of the machine in hard coal seam and analysing the result.

Cutting resistance test of hard coal seam and the analysis of its difficulty degree of digging were introduced in this paper with an example of full-automatic slicer successfully used in the mining of hard coal seam in Jinhuagong Colliery of Datong Colliery Group.

The paper mainly applied the theory of fracture mechanics to deduce the formular of the minimum water pressure, analyzed the influcential factor which had influcence upon water infusion pressure in the steep hard coal seam, and revealed the relationship between water infusion pressure and coal seam pitch and depth.