Based on related research literatures at home and abroad, this paper analyzes the 4 fields in power system risk, which include power system operation risk , power system device risk , electric power market risk, power system security risk, and points out that research on power system risk will provide essential technical support to power system.

Influence of natural ventilation on selection of ventilation equipment;

For purifying experiment space and reducing environment pollution,ventilation equipment of chemistry laboratory was researched,manufactured,designed and exploited over a long period of time and introduces the characteristics of several new kinds of ventilators.