Investigation and Evaluation Heavy Metal Pollution in the Surface Sediments in Guangzhou Section of the Pearl River;

Characteristics of Nitrogen-Transformation Bacteria and Dissolved Inorganic Nitrogen in Pearl River Sediment;

Grain size distributional characteristics of the surface sediments in the Pearl River (Guangzhou section);

Influences of saline water intrusion on environmental elements in outlet section of Zhujiang River;

Chaotic Characteristics on the Extern Pollution in Zhujiang River

Whether Guangzhou Reach of Zhujiang River Will be Taken as a Swimming Area:an Investigation of Water Quality of Urban River Surge and a Certain Section

Particle-scale distribution of polycyclic aromatic hydrocarbons in highly contaminated sediments of the Guangzhou channel of the Pearl River;

Grain-size distribution of polychlorobiphenyls in sediments of the Pearl River;

PF Unit Protozoan Community Characteristics and the Relation with the Water Quality in the Guangzhou Reach of the Pearl River;

A dynamic model of steel ball during the lapping process is presented to meet the requirement fulfill the superprecision machining of steel balls for satellite bearing.