The replacement medium and concentration, critical oxygen content, critical methane content are determined by analyzing the components of inflammable gases and their explosive limits.

This paper summarizes recent research results on soil element background values and heavy metal environmental capacity in the region, and discusses the differentiation pattern of the environmental background value and critical content of the main zonal soils in Guangdong.

By pot culture experiment, the effects of lead added to latosol with different concentrations on peanut crop growth and remains were studied, and the referential critical content of lead in peanut crop was fut forward from the aspects of hygienic quality of agricultural product and effect of crop.

Numerical simulation of cooling heat transfer to supercritical methane in vertical circular tube

By the effective analysis of coal thickness,coa quality,hydrological condition,hidden depth of the coal bed surrounding rock and so on on coal bed methane content in Daxing Well Field expounds slorag of coal bed methane regular pattern and evaluales the necessity and possibity of prospecting and developing of coal bed gas in this area.

It is analysed that the utilization of Ende powdered coal gas-making technology in methanol co-production process can result in a 20% high of CO 2 and a three to five times rise of methane content in gas in view of the characteristics of Ende powdered coal gasification and operational fluidized bed gasification parameters at hand.

Firstly,this paper experimentally made a study of the explosion limit rules of flammable gas(CH4)and its change rule of critical content of oxygen after inert gas(N2)was added into it,and measured the explosion limit range of methane and its safety content of oxygen.

Dynamics of absorption and accumulation of Lentinula edodes accumulated heavy metals from culture medium and critical contents;