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Fire and blast accidents can cause serious damage to the chemical industry park. The research object of this paper was finding the method of accident escape paths in the chemical industry park. This paper analyzed existing state of the traditional emergency drills way of chemical industry park. And based on the investigation and analysis of the emergency drills, the new method of emergency drills escape paths choosing in the chemical industry park based on WebGIS is proposed. The results show that the method of drills escape paths choosing in the chemical industry park based on WebGIS platform is instructive for choosing the reasonable escape path, arousing the interests of personnel taking parting in the drills, and enhancing personnel knowledge of escape.

In this study, finite element analysis (FEA) has been used to investigate the effects of different Laval nozzle throat sizes on supersonic molecular beam. The simulations indicate the Mach numbers of the molecular stream peak at different positions along the center axis of the beam, which correspond to local minimums of the molecular densities. With the increase of the throat diameter, the first peak of the Mach number increases first and then decreases, while that of the molecular number density increases gradually. Moreover, both first peaks shift progressively away from the throat. At the last part, we discuss the possible applications of our FEA approach to solve some crucial problems met in modern transportations.