An algorithm of real time load flow for three phase unbalanced system in complicated distribution system, with high R/X ratio, radial or weakly looped structure and PV nodes is presented in this paper.

Taking Songliao Plain as an example, the proposition that strong stress makes a fragile environment into catastrophe is demonstrated for the first time.

Based on lots of data, from the view of environment and hydrology, this paper analyzes the hydrologic effect of the woods system, and demonstrates the necessity, probability and availability of the green project in the plain under the condition of fragile environment, then gives a way for implementation and puts forward problems.

This paperapplied the basic theory and method of landscape ecology to analyze the landscape pattern of fragile environment in this area.

Against this background,the weak links of mining technologies used in Chinas open pit mines are analysed.

We should find out the ratios of the fault positions and the fault modes,the weak links of the reliablity.

The research focus of a given period in the new century should be directed against the weak links in the general history of Chinese journal.

Nanjing Xuanwu Tunnel,a subaqueous highway tunnel in the centre of the city is a typical geoengineering project in vulnerable environment.

Based on the theory of fuzzy overall merit, it set up the model of distinguishing woodworking machine tool's vulnerable area and gave the fuzzy operation model under different rules of discrimination.

Therefore,it is important to correctly distinguish the vulnerable area of vibration in the machine tool.

Remarks on weaknesses in psychological health education of college students from the case of Ma Jiajue;