Underground coal gasification is implemented under changefully natural environment which is difficult and complicated to execute,so scientific safety preventive measures should be adopted.
Based on polytrophic process of air compression and isothermal gas combustion inside the turbine, an improved gas turbine with generality Carnot cycle is suggested.
It's venom possess neurotoxic, cardiotoxic and hemotoxic properties.The clinical features of cobra bite are various, depend on the species and the ratio of the venous component.
Due to the complexity of occurrence condition and the polytropy of influencing factors,the excavation and supporting in soft failure roadway under high ground stress become very difficult.