As the excellent property of nano molybdenum disulfide, its preparation method has attracted great attention at home and abroad. Currently the chemical synthesis methods of nano molybdenum disulfide mainly include: chemical reduction, chemical decomposition, chemical oxidation, electrochemical, surfactant assisted, hydrothermal and solvothermal synthesis method, natural mineral purification and physical method, etc.

To improve the strength of metals, dispersion strengthening has been developed as an effective method for years. After decades of development, various dispersion particles were applied, such as refractory oxides, carbides, and nitrides.

The copper content of the tungsten copper alloy produced by the pressureless sintering process has a concentration gradient change in the product, which will influence on tungsten copper density directly.

The environmental issues and health effects by nitrogen oxides (NOx) had caught more attentions in the past decade.  The main source of NOx resulting from human activities is the burning of fossil fuels (coal, gas and oil) especially gasoline used in cars. V2O5-WO3-TiO2 is the most common catalysts applied in industrial field for NOx reduction. Unfortunately, the toxicity of V2O5 limits the applications in some fields. Ce-based (Cerium) catalysts, which exhibit remarkable redox properties and high oxygen storage capacity, have attracted much attention in the NH3-SCR reaction.