Spherical Fe3O4@SiO2 nanoparticles with good dispersibility (denoted as S1) were prepared by Stöber hydrolysis⁃polycondensation method, and the particle size was 300～430 nm.In order to investigate effect of carbon number in the organosilicone on 51 hydrophobicity and demusification of magnetic nanoparticles, the methyl triethoxysilane, n⁃hexyltriethoxysilane, n⁃dodecyltrimethoxysilane and n⁃octadecyltriethoxysilane were used to modify the surface of the S1 respectively, and the products were marked for S2—S5. The magnetic samples were characterized by electron microscopy (TEM), scanning electron microscope (SEM), X⁃ray diffraction (XRD), fourier transform infrared (FTIR) spectra and thermogravimetric analyses (TGA). The static water contact angle of magnetic nanoparticles (θW) were 10.6º、42.6º、113.6º、128.0º and 148.3º for S1—S5 respectively, and the results indicated that the θW increased with carbon number in the silane coupling agent increasing. Besides, the hydrophobic coating amount on the S1 surface of S2—S5 were estimated to be 0.005, 0.087, 0.092 g/g and 0.087 g/g respectively. The samples can be applied to removal the oil from water surfaces. Four kinds of silicone⁃modified magnetic particles can remove the surface oil, the n⁃dodecyltrimethoxysilane modified magnetic particles have the best effect of removing oil.

Steam turbines are widely used in electric power, petroleum, petrochemical and aviation industries. The rotor system is a key component of the steam turbine. Because the turbine rotor structure is more complex, high working speed and complex temperature environment of the rotor system easily lead to excessive vibration, rubbing, crack, fracture, other serious accidents and even units damage, resulting in loss of personal and economic property. Through the establishment of a dynamic finite element model for the steady⁃state vibration response of the bending moment excitation of the turbine rotor⁃bearing system, calculation of steam turbine rotor bending moment for steady⁃state vibration displacement and stress response curve, analyses the size and location of bending moment on the influence of steam turbine rotor steady⁃state vibration response, providing theoretical basis for design of steam turbine rotor system dynamics.

The poly (crystal violet) modified electrode (PCV/GCE) was prepared by cyclic voltammetry polymerization under alkaline conditions and the electrode was characterized. The electrochemical behavior of quercetin (Quercetin) on the modified electrode was investigated. The results show that poly (crystal violet) modified electrode has better electrocatalytic activity for the oxidation reduction of quercetin, the redox potential difference in PCV/GCE decreases, and the peak current increases obviously. The crystal violet on the electrode surface acts as a transfer mediator to accelerate the electron transport during the electron transfer of quercetin. In the PBS buffer solution with pH=6.5 and concentration of 0.10 mol/L,the differential pulse voltammetry (DPV) response of the poly crystal violet modified electrode is linear with quercetin 0.10~60.0 μmol/L, and the detection limit was 0.05 μmol/L(S/N=3).The crystal violet modified electrode has good performance in terms of stability, selectivity and reproducibility. The electrode is used to detect the content of quercetin in the liver tablets. The recovery rate is 98.97%~102.01%.

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. 

5,11,17,23tetrasulphonated25,26,27,28tetrahydroxycalix\[4\]arene was synthesized from calix\[4\] arene and concentrated sulfuric acid as raw materials, and characterized with a UVvisible spectrophotometer, thermal gravimetric (TG) and differential thermal analysis (DTA)；finally its electrochemical behavior was studied in the potassium dihydrogen phosphatesodium hydrogen phosphate buffer solution, and the results show that there is an irreversible reduction peak at about 0.93 V in the scan potential between -1.2 ~ 0.8 V, and the reduction peak potential changed with scanning speed.

Being aimed at the problem of contaminated oil in batch transportation of the same gasoline and diesel on different density condition during product oil flowing through the downhill and uphill, with the help of VOF model, the numerical calculation of threedimensional flow model was established. The influence of contaminated oil from different sequence，density，pipe range on boundary layer region was researched on the uphill and downhill road. The results showed that for uphill pipeline the length of the mixed oil of forward diesel was longer than forward gasoline，and the mixed oil volume of forward diesel was greater than forward gasoline. For downhill pipeline the length of the mixed oil of forward gasoline was longer than forward diesel and the mixed oil volume was greater than forward diesel. During forward the same gasoline and trailing diesel for different density diesel, the smaller density could help reduce mixed oil volume.

In batch transportation of finished oil products, mixed oil would be produced by adjacent batch oil. The cases of 30°, 45°,60° or 90° for the joint line of the variable diameter part and the straight pipe of the variable diameter pipe were calculated by the CFD software. The conclusion show the relationship and the change law between the angle of the joint of the variable diameter part and the length were researched. The results show that with the angle increased, the mixed oil segment length decreased in the sudden expansion pipe and the opposite conclusion in the reducer, which was coincided with engineering basic phenomenon.

Considering the large resource of low temperature waste heat in heavy reservoir thermal recovery process, the technology of recover waste heat in oil field was used for heating pipeline in heavy oil transportation. The model of dynamic simulation system of the technology was established by MatlabSimulink, and the heating efficiency of the technology system was obtained. The results of the study show that the heating temperature of system can achieve 75 ℃, satisfied with the temperature requirements of heating water in heavy oil transportation, and the heating coefficient of system is 3.5. Based on this, through the analysis of the energy that the established system model can save standard coal 17 t/a better than boiler heating model, to reduce the discharge of pollutants in the air 0.714 t/a, the system has a large economic and environmental benefits.

In digital transmission system, roll-off filter is usually used to shape the transmission wave form that does not produce Inter Symbol Interference (ISI). The roll-off filter must satisfy the Nyquests first criterion. But in many papers and books, only graphs are used to illustrate the construction of the characters of the shaping filters which were deduced from the Nyquests first criterion. The Nyquests first criterion was deduced according to Nyquests sampling theorem and used it reversely, and then the method to construct shaping filters which satisfied Nyquest's first criterion was given. The mathematical model is clear, and the result is same as the graph method.

Cu(Ⅰ)Y zeolites was prepared with liquid phase ion exchange under the condition of N2 at high temperature．The desulfurization of different sulfur compounds was studied on the Cu(Ⅰ)Y zeolites in a fixed bed adsorber at ambient temperature and pressure and a SCD GC . The results show that the performance of the compounds decreases as follows: benzothiophene (BT) >dibenzothiophene(DBT) >4,6-dimethyldibenzothiophene (4,6-DMDBT) >thiophene (TP) . For the same purpose the adsorption was also calculated in terms of density functional theory (DFT) . The results show the adsorption energies of the thiophenic compounds as follows: benzothiophen (BT) -96.4 kJ/mol, dibenzothiophene (DBT) -88.5 kJ/mol, thiophene (TP) -111.5 kJ/mol, 4,6-dimethyldibenzothiophene (4,6-DMDBT) -83.7 kJ/mol. The results agree with the experiments.