In the process of metal milling, especially in the machining of low?stiffness workpieces, chatter is a key factor affecting many aspects such as surface quality, machining efficiency and tool life. In order to avoid the chatter, a milling chatter recognition method based on dynamic and Wavelet Packet Decomposition(WPD) is proposed from the signal processing. The modal parameters of the system are obtained by modal experiments. Based on the principle that the chatter frequency will peak near the natural frequency of the system, the original milling force signal is decomposed by WPD, and the sub?signals containing rich chatter information are selected for signal reconstruction. Finally, the time?frequency and Hilbert spectrum characteristics of the reconstructed signal are compared and analysed, and the chatter recognition is performed. At last, the proposed method is verified by the experiments. The results demonstrate the effectiveness and reliability of the proposed method.

The conditions of high temperature, high pressure and high sulfur content in deep well oil and gas exploitation put forward higher requirements for the sealing ability and service life of the downhole packer. K344 steel belt packer can improve the pressure bearing capacity of the expansion rubber cylinder and the stress condition in the process of pressure bearing and service life through the laminated steel belt between the inner and outer rubber cylinders, which is suitable for the requirements of deep well oil and gas exploitation. In this paper, the finite element software was used to simulate the setting process, the contact stress distribution law of the key components (inner rubber cylinder, outer rubber cylinder and laminated steel strip) and the mechanism of laminated steel strip to prevent the rubber cylinder from "shoulder protruding" were obtained. The optimal distance between the laminated steel strips at both ends and the optimal radius of the hoop fillet were selected through simulation analysis. It provided a reference for the optimization design of steel belt packer in practical production and application.

Polypropylene V30G and K4912 were respectively modified by melting blend method to prepare the special high rigidity PP material for the small household appliances. The effects of content of two nucleating agents G5588 and T5688 on the properties of polypropylene were studied. The prepared material showed the best property when using polypropylene PP (V30G) as matrix resin and G5588 as the nucleating agent. When the mass fraction of G5588 was 0.20%, the tensile strength of rigid polypropylene was 35.3 MPa, flexural strength was 37.87 MPa, impact strength was 3.84 kJ/m2, and the melt flow rate was 16.32 g/(10 min).

The Keggintype phosphotungstovanadic heteropolyacid catalyst was synthesis by N a 2HP O4、 N a VO3  and N a 2WO4·2H2O. Then,H4PW1 1VO4 0 heteropolyacid hybrid materials was prepared by reacting H3PMo12O40 with 1butyl3methylimidazolium bromide ionic liquid. The prepared catalyst was characterized by XRD and IR, and the results showed a characteristic Keggintype structure of 4PW1 1VO4 0/ S i O2,以 H2O2  catalyst was prepared using SiO2 as the support. The suppoted catalyst was then applied as catalyst for the degradation of Rhodamine B using the H2O2 as the oxidant. The obtained optimal reaction conditions was 3 mL of H2O2, the weight of 4PW11VO40 20% loading, 0.35 g of catalyst at 40 ℃ for 1.5 h. Under the optimal condition, the degradation rate of Rhodamine B was up to 98.4%. The catalyst shoed good reusability and can be reused for many times without the decrease of degradation activity of Rhodamine B .

The  H5PMo 1 0V2O4 0 with Keggin structure was prepared by mixing Na2HPO4, NaVO3, and Na2MoO4•2H2O in stoichiometric amount. Then the \[ Bm i m] 5PMo 1 0V2O4 0 hybrid materials was prepared by reacting H5PMo 1 0V2O4 0 with the 1butyl3methyl imidazolium bromide ionic liquid. The IR spectra and XRD data showed that the synthetic \[Bmim\]H5PMo 1 0V2O4 0 hybrid materials display Keggin structure. The SiO2supported \[Bmim\] 5PMo 1 0V2O4 0 hybrid materials were obtained, and the prepared samples were applied to the catalytic degradation of organic dyeRhodamine B. The optimal reaction condition was 30% of \[Bmim\] 5PMo 1 0V2O4 0/SiO2 loading, 1.5 mL of hydrogen peroxide, 0.2 g of the catalyst at 40 ℃. Under the optimal conditions, the highest degradation rate of organic dye Rhodamine B reached up to 97.58%. The catalyst show good regeneration performance, which can be reused at least four times and the degradation rate of Rhodamine B was no significant declined. 

The total idea for waste water controlling was described and then the emission concentration limited of the chemical oxygen demand（COD）and the ammonia nitrogen（NH3N）for the Jinsha River, the Luanhe River and Dalinghe River were calculated respectively by twodimensional water quality model. The results show that the COD emission concentration limits of the three rivers were under the current standards. However, the NH3N emission concentration limits were all closed to or above the standards; the recommended COD and NH3N emission concentration limits were no more than 60 and 15 mg/L, respectively.

By analyzing the failure of ERPN32200 pump mechanical seal, it was found that the actual sealing effect of mechanical seals is related not only to the performance itself, but also to the precision, size, and assembly quality of the relevant parts. In the meantime, it was proposed that the corresponding measures to cope with the problems, thus prolonging the service life of mechanical seals.

The oxidation desulfurization and denitrification of coker gasoline were carried out with hydrogen peroxide as the oxidant, phosphorus tungsten acid as catalyst, cetyl trimethyl ammonium chloride as phase transfer catalysts and furfural as extracting agent. The desulfurization and denitrification rate can reach to 89.93% and 95.10% under the following conditions: gasoline 50 mL, catalyst 0.32 g, phase transfer catalyst 0.09 g, hydrogen peroxide 5 mL, oxidation temperature 70 ℃, oxidation time 60 min. The Oxidant Solution can be recycled when replenishing appropriate oxidant and phase transfer catalysts, and the extractant can also be recycled after treatment. Without phase transfer catalyst, the desulphurization and denitrification rate were only 77.35% and 91.98%, respectively. Therefore, phase transfer catalyst can greatly improve the desulfurization performance.

The researches on Kazakhstan oil-wet oil sand were carried out by the solvent extraction method, from which the best solvent was found out. The influences of oil sand particle, the weight ratio of oil sand, the solvent type, and the extraction time of the oil yield were discussed in the experiment. When naphtha was chose as the solvent with the oil sand size blow 40 mesh, the ratio of solvent and oil sand fixed at about 4∶1, and the reaction time about 10 min at room temperate. The recovery yield of oil from oil sand is above 98%. The experiment is instructive to oil-wet oil sand separation.