Based on the phenomenon of plastic collapse,a dynamic col- lapse criterion is proposed and the relevant critical impulse is given.

An equation for the critical discharge between scour ing and filling in alluvial rivers was derived through the theory of non|equili brium sediment transport.

An equation to calculate the critical discharge for river bed variation in alluvial rivers was derived through the theory of non-equilibrium sediment transport.

An experimental investigation on perforation of three spans continuous thinwall and thickwall tubular beams filled with water and pressure under lateral impact of blunt, spherical and conical projectiles is reported in this paper, and critical impact perforation models and critical impact perforation energy of continuous tubular beams are obtained.

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.