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.

In this paper we mainly discuss the first two moments of the ruin time T 、recovery time ~ ( = 1 , 2 , ) and the sum of recovery time ~ in the compound binomial model by renewal method and martingale method when the initial surplurs is u .

The main aim of this paper is to study the first two moments of ruin and recovery times in the compound binomial model.

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