Straighten up professional ethos for the construction of a harmonious hospital;

Research on application of downward ventilation to coal mining face in horizontal seam with coal outburst in potential;

Field experiments using downward ventilation were studied and the gas emission and distribution laws at the goaf working face were discussed.

This paper discussed methane emission,the reasons for methane reduction in up corner,problems should be considered in the condition of change from normal ventilation into downriver ventilation.

In order to quantitatively analyze the flight risk for wing icing,the probability assessment was proposed in which the simulation data of the pilot-aircraft-environment system was utilized.