<正> Presented a study on the design and implementation of spatial data modelingand application in the spatial data organization and management of a coalfield g
<正> The velocity of an over-burst coal seam is about 1/3 compared to a normal coalseam based on laboratory test results.This can be considered as a basis to co
<正> Introduced the coal and rock AE propagation rule,wave guide fixing technics onAE sensors,and AE forecasting coal and rock disaster on the scene and so on,T