The present situation of flue gas denitration technology in China is introduced, focusing on the a- nalysis of the characteristics of the SCR flue gas denitration technology. It is pointed out that the flow field optimization is a key factor of SCR flue gas denitration technology,numerical simulation is fit for the realization of low cost, fast and comprehensive prediction of the flow field data. On the basis of reviewing of application history and status of the numerical simulation method in the field, analysis is made of the problems in the uncomprehensive consideration of SCR system heterogeneous chemical reaction and the lack of enough model test results to verify the simulation results. The future development will be oriented to find out the solutions to these problems.

Tb3＋ doped YPO4 samples were successfully synthesized with a polyacrylamide gel method. The crystal structure, particle size,morphology and luminescence properties of the as-synthesized samples were investigated by XRD,TEM and PL. The effects of Tb3＋ doping concentration,the precursor solution pH and the molar ratio between RE （RE=Y and Tb） and P on the phase structure and luminescence properties of the products were investigated. The results show that the single-phase tetragonal YPO4 ： Tb3＋ crystal with particle size of about 6- 10 nm can be obtained with polyacrylamide gel method. The photoluminescence spectra of Tb3＋ doped YPO4 samples show a characteristic green luminescence of Th3＋ under 222 nm UV light excitation. Furthermore,the concentration quenching is observed when the Tb3＋ doping concentration is over 60% ,indicating that the n（Y＋Tb）/n（P） has a significant influence on the phase structure and luminescence properties of the samples, while precursor solution pH only affects their luminescence properties. Under the conditions of n（Y＋Tb）/n（P）=l ： 1 and pH=6,the products of high luminescence intensity can be obtained.

Effect of rare earth on solidification microstructure and cast thermoplasticity of Fe-36Ni invar alloy was studied through a vacuum induction furnace and a Gleeble--3800 thermal mechanical simulator. The results show that after adding 0.12% Ce＋0.06% La mixed rare earth,the alloy solidification microstructure is remarkably refined, the columnar grains become shorter and thinner, the growth pattern changes from linear growth into staggered growth,and the proportion of equiaxial grains increases up to 40 %. However,after adding 0.12% Ce＋0.12G La mixed rare earth,the cast thermoplasticity of the alloy seriously deteriorates in 850-1 200 ℃ temperature range,mainly due to a lot of Fe-Ni-Ce-La rare earth intergranular brittle phases generated at grain boundaries. These intergranular brittle phases weaken the grain boundary binding force and hinder the movement of the grain boundaries,deteriorating cast thermoplasticity of the alloy.

The corrosion resistance of sintered Nd-Fe-B alloy prepared by HD and CG processes were investigated in HCl and Na（OH） solution and saturated salt solution,and the microstructure of samples prepared by two kinds of processes were analyzed. Results show that for all the samples in HC1,Na（OH） and saturated salt solution,the corrosion rate is faster in the first 8 h,but then becomes slower. The causticity of HC1 solution for sintered Nd-Fe-B alloy is stronger than that of Na（OH） and saturated salt solution. The corrosion resistance of alloy samples by HD is superior to ones by CG,and the corrosion resistance of alloy samples with no remanence is superior to ones with remanence.

The latest development of milling technology of NdFeB permanent magnet material is reviewed, and detailed description is made of the physical method, rapid solidification method, gas atomization method and HD method. With the improvement of milling technology, powder particle size, defects and magnetic properties are improved to various degree. Milling technology will be developed with the tendency towards the combination of various techniques.

With sodium tungstate and cupric nitrate as raw materials,W-Cu composite powders were prepared by hydrothermal synthesis and coreduction process, and then W-Cu composite materials were prepared by vacuum hot-pressing sintering. The microstructure and morphology of W-Cu composite powders and the micromorphology and physical characteristics of W-Cu composite materials were investigated. The results indicate that the W-Cu nanocomposite powders prepared by hydrothermal synthesis and coreduction process are well distributed,with particle size of about 70 nm. Then W-Cu composite materials can be obtained by pressure sintering and heat treatment,in which Cu phase is well distributed around W phase and the two phases are closely bonded. Its relative density reaches the maximum of 99.2% at the heat treat- ment temperature of 950 ℃, its electrical conductivity reaches the maximum of 46.5 % IACS at the heat treatment temperature of 800 ℃ ,and its Brinell hardness reaches the maximum of HB285 at the heat treatment temperature of 900 ℃.

The W-VO2 monolayer thin film and ZnO/W-VO2 bilayer thin film were respectively prepared by magnetron sputtering on glass substrates, and then annealed in Ar atmosphere. Their crystal structures, resistance-temperature curves, surface morphologies, visible light transmittance and infrared transmittance were measured with X-ray diffractometer, LCR tester, scanning electron microscope, UV-Vis spectrophotometer and infrared spectrometer. The results show that the phase transition temperature of ZnO/W-VO2 bilayer thin film decreases to 35 ℃ ,thin film growth is more compact and uniform,its visible light transmittance increases by about 23% ,and infrared light shielding effect is better.

Mo2C powders were prepared at lower temperature using molten salt method with Mo-C mixed powders treated by mechanical activation. Meanwhile, the influences were investigated of milling （i. e. , mechanical activation） time, molten salt temperature and heat preservation time on the microstructure and morphology of the samples. The results indicate that under the optimized conditions of 10 h milling,900 ℃ molten salt temperature, 1 h heat preservation, Mo2C powders can be obtained with particle size of about 500 nm. It is found that prolonging milling time can promote the subsequent formation reaction of Mo2 C in molten salt and help to reduce molten salt temperature of the subsequent reaction to ensure energy conservation.

ZrO2 doped molybdenum powders were prepared by sol-gel process and two stage hydrogen reduction,and then ZrO2 doped molybdenum alloy was prepared by powder metallurgy process. ZrO2 doped molybdenum powders and ZrO2 doped molybdenum alloy were characterized by SEM, TEM, XRD and EDS,and the strengthening mechanism of ZrO2 doped molybdenum alloy was investigated. The results show that the prepared ZrO2 doped molybdenum powders have fine but uneven grains and show sphere-like shape, with slight agglomeration phenomenon. The doped ZrO2 of the prepared molybdenum alloy disperses into the grain boundary of molybdenum substrate in the form of the second phase,and the strength of the molybdenum alloy is enhanced by Orowan strengthening and fine grain strengthening.

ZrO2-glass or SnO2-glass oxidation resistant coating was prepared on molybdenum substrate with the slurry method. Phase composition and microstructure of the coating were characterized by X-ray diffraction （XRD） and scanning electron microscopy （SEM）,respectively. The oxidation resistance at 800 ℃ of the coating was also tested. The results show that there are BaZrSi3O9 phase and BaSnSi3O9 phase respectively in ZrO2-glass coating and SnO2-glass coating,and both the two phases have oxidation resistance to protect the coating from oxidation within a certain time. After 2 h high temperature oxidization in air, ZrO2-glass coating is only consisted of ZrSiO4, and SnO2-glass coating contains BaMo2O7 and BaMo2O7 resulting in coating weight gain. The oxidation weight gain curve of ZrO2-glass coating changes more gently and its weight gain increases at first and then gradually decreases, while the weight gain of SnO2-glass coating always increases.