Applied Mechanics and Materials Vols. 727-728

Abstract: The NiO/BiVO₄ composite photocatalysts were synthesized by hydrothermal method and were characterized by powder X-ray diffraction(XRD),scanning electron microscope (SEM), UV-vis diffuse reflectance spectrum(UV-vis DRS), Energy Dispersive Spectrometer (EDS), BET techniques. The photocatalytic activities were determined by oxidative decomposition of methyl orange in aqueous solution under visible light irradiation. The results showed that the light absorption of the NiO/BiVO₄ became higher in the visible range compared to pure BiVO₄, meantime, accompanied by a bathochromic shift of the absorption edge. The photocatalytic activities were evaluated by the photodegradation of Methyl Orange under visible light irradiation. The results showed that NiO loaded evidently improved the photocatalytic activity of BiVO₄, and loaded amount had a different impact on the catalytic activity of BiVO₄, The 20%NiO/BiVO₄ which exhibited the favorable photocatalytic activity in the photodegradation of Methyl Orange.

Abstract: Ethylene propylene diene monomer (EPDM) rubber was exposed to an accelerated thermal aging environment produced by an air-circulating oven for different time periods. The changes of thermal stability and chemical structures of EPDM were monitored by thermo-gravimetric analysis (TGA), Attenuated total reflection-fourier transform infrared spectroscopy (ATR-FTIR) and X-ray Photoelectron Spectroscopy (XPS). The results showed that the accelerated thermal aging environment did not obviously affect the thermal stability of EPDM. FTIR and XPS confirmed the formation of hydroxyl, carbonyl and ester groups in the test environment.

Abstract: Electrochemical deppsition methods (electroless plating and electroplating) were used to deposit a thick nickel on surface of quartz optical fibers. A thin Ni--P film was firstly to be deposited on the fiber by electroless plating. Then a thick Ni coating with thickness of about 1.7 mm was deposited on the Ni-P film,as a substrate, by electroplating. The effects of the concentrations of NiSO₄·6H₂O, NaH₂PO₂·H₂O , C₃H₆O₂ , H₃BO₃ , pH value and temperature on the quality of Ni-P coatings were investigated and their optimal values were determined by orthogonal test method..The effects of concentrations of NiSO₄·6H₂O and C₁₂H₂₅―OSO₃Na and current density on Ni deposition were studied and the optimum technical conditions were discussed. Under the optimal conditions, the thin Ni-P film possessed good smoothness and strong adhesive force and the Ni-coating had good quality with fine Ni crystals and uniform surface.

Abstract: Collagen, as an important biomedical material, has been widely used in medical industry. Fish waste (scales, skins, bones, fins and swim bladders) is a kind of newly developed alternative collagen raw material.This paper uesd papain as enzyme and local bighead fish scales as raw material to extract collagen. More attention was paid to the study on enzymatic reaction kinetics of papain-extracted collagen. The results showed that two kinds of kinetic models(Michaelis-Menten equations and exponential type dynamic equations) at 20, 25 and 28°C were established, respectively and experimentally proved to be basically in agreement with the actual values. These models have a great significance to predict, adjust and control the reaction rate and production output under different conditions.

Abstract: A highly stable and sensitive electrochemical sensor was developed by electropolymerisation of poly (3, 4-ethylenedioxythiophene) (PEDOT) and ferrocene (Fc) on gold electrode for the determination of ascorbic acid (AA). The PEDOT/Fc composite film modified Au electrode was characterized by field emission scanning electron microscope，electrochemical impedance spectroscopy and cyclic voltammetry. Compared with bare electrode, the PEDOT/Fc modified electrode exhibited excellent electrocatalytic activity toward the oxidation of AA.

Abstract: The machinability of Titanium alloy Ti6Al4V is poor, so the new green cutting technology with water vapor and ionized air as coolants and lubricants was proposed to achieve the aim of efficient and green cutting for Ti6Al4V. In this paper, the milling formation and milling force were studied in machining Ti6Al4V with application of ionized air and water vapor for cooling lubricants. A set of milling tests using carbide tool YG6 were performed under dry cutting, oil emulsion, water vapor and ionized air, respectively. The results of tests indicated that the milling formation was decreased with increasing feed per tooth and the milling force increased with increasing feed per tooth, the milling formation and milling force were reduced during water vapor and ionized air condition.

Abstract: Considering the actual factors such as axial compression ratio, constraint conditions and so on, We design 10 beam-column joints of different parameters under the condition of the same reinforcement ratio and use the monotonic loading type to study the influences of dosage of recycled aggregates and waste fibers, waste fiber length on beam-column joints on the ultimate bearing capacity of the core area. Experimental research shows that when the dosage of recycled aggregates is 50% , waste fiber content is 0.12%, waste fiber length is 19 mm, the node ultimate bearing core area best performance.

Abstract: Waste coal fly ash was used, as a cheap and handy material, to synthesize zeolite.The synthesized zeolite was then taken, as a carrier, to load CuO by dipping method for heterogeneous catalytic wet oxidation of acid bright red GR wastewater. The optimal process parameters of CuO loading were determined by orthogonal test. The comparison of XRD patterns of zeolite and CuO/zeolite displayed that CuO was successfully loaded on the zeolite.The SEM morphology of CuO/zeolite revealed that the cotton shape structure with more loose surface of CuO/zeolite was obtained compared with the SEM morphologies of fly ash and synthesized zeolite. The experimental results of water treatment showed that high COD_Cr and chroma removal rates of 88.27% and 99.97% were achieved by the prepared CuO/zeolite sample,respectively.

Abstract: Structural, electronic and optical properties of S-doped anatase TiO₂ have been investigated using the first-principles density-functional theory. The band structure and density of states show that the band gap of anatase TiO₂ narrows due to the presence of the S-3p energy level in the top of the valence bands. Compared with the optical absorption edge of the undoped anatase TiO₂, the optical absorption edge of S-doped anatase TiO₂ shifts to a lower energy, which indicates that S-doped anatase TiO₂ can be used for visible-light absorption applications.

Abstract: Develop a new type of alloy cast iron material.Design experimental scheme and research method, choose low tin vermicular cast iron as raw materials, to determine the main alloying element and trace alloying elements, formulate the necessary particularizing alloy. On the basis of strict technology and process, to complete the cast iron smelting, produce vermicular cast iron that has a good comprehensive performance. To observe the metallographic structure of cast iron under a microscope. Finally，test the stretchability of the developed vermicular cast