The eolour reaction of chlorophosphonazo with barium（ Ⅱ ） was studied. And the effects of the coexistent ions on the colour reaction were also investigated. The results show that the chromogenic reagent （chlorophosphonazo） reacts with barium to form a stable green complex in NH3 · H2O-NH4Cl buffer solution of pH10.0. The complex exhibits an absorption maximum at 670 nm with an apparent molar absorptivity of 6.49 × 10^4 L/（mol · cm）. The spectrophotometric determination is of high sensitivity obeying Beer＇s law,when 25 mL sample solution contains 0450 μg barium. The disturbance of Ba determination from Al and Fe can be sheltered by adding triethanolamine and 1,10-phenanthroline monohydrate, and Ca disturbance by adding EGTA-Pb. The Ba content in Si-Ca-Ba alloy can be determined by spectrophotometry with chlorophosphonazo,where the determined result is in good agreement with the certified value and the relative standard deviation （RSD） is less than 2 %.

The working principle of electron backscattering diffraction（EBSD） is introduced,and the applica tion of EBSD in analyzing material texture was investigated taking hot-rolled brass as an example. The preferential orientation of brass texture formed during hot rolling was analyzed qualitatively and quantitatively by pole figures and inverse pole figures. And the size and misorientation of brass crystalline grain were also studied. Furthermore,EBSD can be applied to studying the formation of material texture crocosmic level,which is of great practical significance to improve material research level and obtain sary scientific data for the production and machining of plate material.

The type of liquid clarification filtration is summarized as well as the characteristics of their filtering apparatus presently used in industrial production. The main disadvantages of the filtering apparatus are also pointed out. Then subrigid macromolecular precise millipore clarification filtation technology is emphatically introduced from technological principle, technical characteristic and application example, and its excellent filtering quality was proved by the filtration test of industrial Na2CO3 aqueous solution.

The basic manufacturing techniques of tantalum and niobium carbides are introduced,and some new preparation technologies of their ultrafine products are analyzed in detail. Furthermore,their production capacity and application fields are summarized.

Based on the different compositions of Co-Mo/Ni-Mo catalyst, Mo sulfide catalyst,multiphase oxide catalyst, loaded Mo-based catalyst, Mo heteropoly compound catalyst, molybdate catalyst and new MoC/MoN catalyst, their application and mechanism in chemical reaction are reviewed, respectively. And the application prospect of Mo-containing catalysts is also analyzed.

The preparation technology of MoS2 is introduced, the natural method and synthesis method are emphatically analyzed from their technological characteristics. Furthermore,the application of MoS2 and its latest development is summarized.

The deposition mechanism, microstructure and comprehensive properties of eletroless crystal Co-P alloy are described, and its industrial application is introduced in detail. Furthermore, its existing problems and development trend are pointed out.

The welding performance of titanium-stainless steel dissimilar metal is analyzed, and many welding technologies of titanium-stainless steel are introduced. In these welding technologies, the indirect fusion welding adopting transition metals is the most beneficial.

Ag-based alloys containing 3% CeO2 or γ-Al2O3 were prepared by powder metallurgy. The microstructure of the Ag-based alloys is studied by X-ray diffraction and metallographic analysis,and the hardness,electrical conductivity, density and friction factor were also tested. The results show that both the two alloys have a relative density of more than 98%. Compared with pure silver metal, the electrical conductivity of the two alloys greatly decreases, the grains are obviously refined, the hardness is improved, but the friction factors of Ag and Cu are not obviously lowered.

The silicothermic reaction of lithia in vacuum is analyzed from thermodynamics,and its minimum temperature and the corresponding dew point temperature under different conditions are calculated. The results show that the reaction temperature and the corresponding clew-point temperature should be over 900 ℃ and 606 ℃ respectively to obtain the liquid-condensed lithium by silicothermic reduction of lithia. The verification test was carried out in a vacuum silicothermic reducing furnace to obtain the condensed lithium metal.