Based on the investigation about the service cost and yield of the transplanter that possessed by the peasants and service organizations,applied statistical and breakeven analysis technique,the main factors and its effect of the transplanter activity cost have been found,proposed the most service model and the critical working areas each year for the transplanter.

Study on effect of membrane fiber length on critical flux in a novel membrane bioreactor;

Study of critical flux in flat-sheet membrane bioreactors;

Factors affecting critical flux in submerged flat membrane bioreactor;

Through analyzing the effect of the vertical locations of horizontal wells on the critical output and gas breakthrough time of the gas cap reservoir, the curve showing the relationship between the vertical locations of horizontal wells and the critical output as well as the gas breakthrough time is obtained in t.

The bottom water coning model used by Boyun Guo considered the influence of perforation length on critical output, so it can be used to calculate the perforation length of bottom water reservoir.

The paper has discussed the effect of vertical locations of horizontal wells on the critical output and producing pure oil time,analyzed the ratio .

Analysis of difference in threshold quantity for identification of major hazard installations between domestic and aboard;

Under our country background, the standard of Identification of major hazard installations was revised in application scope, the classification of major hazard installations, the category of dangerous substance, threshold quantity of unit, and so on.

Based on the threshold quantity of Identification of major hazard installations in "Identification of major hazard in-stallations",it makes out the hazardous chemicals catalog and their threshold quantity suitable for China, and offers some suggestion of implementing process safety management in China.