Nanocrystals Y2O2S:Eu3+(molar ratio of Eu3+ /Y3+ was 2%) were prepared by indirect method.

The indirect method is prior to the direct method in its safety and equipment,while the direct method is prior to the indirect method in production efficiency and energy consumption.

Some dispute problems about the content of coal bed gas(methane) predicted by indirect method,including the existing status of the methane,the adsorption isotherm models for coal bed gas and their relationships,the free methane state in coal seam and the parameters for its capacity calculation,were discussed and analysed.

Synthesis of methylchlorosilane by direct process and its gas chromatographic analysis;

New technical to direct process slag with high bismuth and produce antimony white;

During the technology of Zincite produced by direct process from the Zinc Sulfide mineral concentrate in high elevation area,the characteristic of the impurities,distribution was different from that of the technology under usual condition.

Reformation of the tail gas separator of NaNO_2/NaNO_3 made by direct method;

The comparion of retention force of posts made from diffenent materials with direct method;

Bench Scale Experiment on Preparation of Low Power Consumption Soft Magnetic Ferrite by direct method;