A series of perovskite-type oxides and supported Ag catalysts were prepared,and characterized by X-ray diffraction (CRD)and x-ray photoelectron spectroscopy(XPS
The long term trend of ozone level in Hong Kong has been investigated. One of the characteristics of ozone level in Hong Kong is the existence of autumn maxim
The sedimentation of cylindrical pollutant particles which fall through a fluid is investigated. Differing from previous research work,particle oscillation and
The paper differentiates approaches in technology (end-of-pipe, cleaner production, industrial ecology, zero emission and eco-social tech) and compares them in