Not only for environmental protection, but also for process technology in itself, it is an urgent task to integrate environmental impact minimization into chemical process synthesis.

This method of evaluating the environmental impact of chemicals is very simple but comprehensive, and is very useful in practical applic.

In the new algorithm a rational fitness function is designed taking account simultaneously of the number of hops in a lightpath and the current network conditions and the genetic algorithm is in combination with least influence wavelength assignment algorithm,thus improving the conventional RWA algorithm.

Behavior and environmental influence of trace elements in cement production;

Connecting with the present situation of the economic evaluation of the environmental influence, this paper analyzes the current economic evaluation system of the environmental influence, and advances some suggestions on perfecting the economic evaluation of the environmental influence of construction project.

This paper analyzes on the subsidence of Nanzhuang Coalmine of Yangquan City and the environmental influence caused by the subsidence,and puts forward some rational and practicable countermeasures for preventing the subsidence.