The malpractice for traditional underground gasification stove is pointed out, the superiority for the long tunnel large section underground gasification furnace is explained, and the new technology craft of two stage, double fire source, inverse direction combustion gasification, multifunction holes, and pressing and pumping combination is introducted, and the test results are analysed.

On the basis of material balance, a model of two-stage underground coal gasification in counter directions is built with ideal gasification parameters.

This paper introduces the model test on two-stage underground coal gasification(TSUCG) in laboratory.

In present period,all the highway projects in our country should carry through two-stage feasibility study.

The two stage method of the damage identification of highway bridge based on improved genetic algorithms;

This paper presents a method for getting initial basic feasible solution of linear programming problem with an artificial variable,comparing with a traditional two-stage way,it has low computation amount and needs less memory cells for computing,and improve two-stage way simple method.

This paper presents a method for seeking initial basic feasible solution of linear programming problem without using artificial variable,comparing with traditional two-stage way,it has low computation amount and needs less memory cells for computing,so it is an improved two-stage way of the first period question.