According to analysis of the major LPG accidents of the world accident release mode were obtained and consider production practice and storage in China, the potential accidents release mode were also obtained and then LPG release rules were found and LPG release source mode is developed.

This study examined the effect of different power source patterns on prepared calcium phosphate coatings by electrochemical deposition technique using constant current and pulse current.

To develop the volumetric heat source mode for laser+GMAW hybrid welding,four new kinds of distribution functions of volumetric heat sources are proposed after considering the geometry characteristic of laser deep-penetration welds and analyzing the action features of heat source in laser welding.

The area source model of particulates was deeply researched, and the places of the initial precipitation of the area sources of particulates were determined.

It has become a more and more urgent task to develop a better method for calculating the area source model with the increase of the atmosphere pollution as a result of human beings' activities.

The mathematical method of the area source models that were usually used for atmospheric environment simulation in China was reviewed and a new concept,reversed diffusion parameter of area sources,was developed.