The fire and explosion risk factors in the production of formaldehyde are analyzed,and risk index assessment method of Dow's Chemical Company is used to evaluate the risk of formaldehyde production equipment.

Fire explosion risk factors in the production of the Phthalic anhydride are analyzed and risk index assessment method of Dow\'s chemical company is used to conduct safety assessment on the production equipment of Phthalic anhydride.

In this paper,certainty and uncertainty factors of accident-causing of bridge crane are surveyed,a new uncertainty analysis of risk evaluation is developed,and by means of Fuzzzy set theory and nonlineaar programming algorithm,possibility value of bridge crane accident is investigated.

This review covers the structure and toxicology of cyanobacterial toxins, their health effects, and briefly introduces the environmental behaviours, the risk assessment and the monitoring of cyanobacterial toxins.

Combined with characteristics of environment information in coal mine underground,the paper introduced a risk assessment system of environment information in coal mine underground based on multi-sensor information fusion(MSF).

Application of LEC Assessment in Check and Treat of Hidden Risk;