Shenglan Zhang (The first author), a teacher from a department of the electronic information and technology, published an academic article on the international periodical" Atmospheric Environment" in November 2015. The name of the article is "Mixing state of atmospheric particles over the North China Plain". The research was done by several Institutes,which was including the Institute of Atmospheric Physics, Chinese Academy of Sciences, Peking University, CUIT and the Leibnitz search institution in Germany. The federal research successfully combined the system HTDMA and VTDMA on aerosol's character of moisture absorption and volatilization. As we were known, it's the first time in interiorly.