Study on the structure characteristics and movement laws of overlying strata with large mining height;

Approach on the large mining height technology at blasting face;

Approach on large mining height at middle thick coal seam;

The characteristics of fully dry bag dusting technology of large blast furnace gas were presented.

Viewing from the main patterns of coke degradation in large blast furnace,as well as the internal and external factors of the degradation,reconsidering quality index of coke for the fur-nace is discussed.

The full dry cloth bag dusting process of large blast furnace and its use effect were described,and notable problems of the process in use were pointed out.

In order to produce quality high temperature Daqu and further to improve the quality of Maotai-flavor liquor,we must pay more attention to the important procedures including "high temperature,more water,minute oxygen,and hypoxia".

On the other hand, the contents of acidity and acid protease in high temperature Daqu are increasing with the rise in product temperature but the content.

In this experiment, we studied the effects of five different extraction methods (based on different lysis principles) on total DNA extraction from high temperature Daqu.

In order to develop the high-yield and cost-effective working face and enlarge the application area of the technique of full height mining at one time,the structure height of hydraulic support keeps increasing( those supports whose height is greater than 5 m are called the super great mining height).