This paper discusses on the present situation of and existing problems in the process of the heavy- medium system of Xiqu Coal Mine's Coal Washery, emphatically analyzes on the de- medium effectiveness, which provides reliable foundation for reducing the cost (the medium consumption of the system) and increasing the de- medium effectiveness of the sculping screen.

According to a survey carried out in Nanjing and Xuzhou colleges,the paper analyzes and evaluates the status quo of the college students media literacy and the differences in the two cities from the following aspects: common knowledge and the construction feature of mass media,objectivity of information,media genres and media language,mass communication process,mass culture,and media effects.

The dissolved oxygen distribution and nitrogen removal effect in different structures of wetlands were investigated by two groups of comparison experiments(vertical flow with horizontal flow;single-stage with three-stage horizontal flow).

This paper studies material preparation,ion exchange model,acid wash and Fe exchange quantity effect for defluoridation material saturation absorbent quantity of model 732 changed property resin defluoridation;also concomitant ion influence on defluoridation effect of Fe(Ⅲ)-R and defluoridation mechanism of defluoridation material is explored.

The paper introduces the working principle,structural and technical characteristics,dehydration effect and economic benefits of GPJ-60A pressurized disk filter.

The impacts of various technological conditions on removal effects are investigated with the optimal technological conditions obtained as follows:ratio of Ca2+ to SO42- as 1.