Mechanical Engineering and Materials Science

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Authors: Cui Shu Ling
Abstract: The dyeing process of Polysulfonamide (PSA)/poly-m-phenylene isophthalamide (MPIA) blended yarn is studied. By choosing suitable dyeing carrier and dyeing parameters, the optimum dyeing condition was determined as follows: cationic dye 2-3%(o.w.f.), carrier acetophenone 40g/L, sodium chloride 15g/L, pH value 4-5, dyeing at 140°C for 60 minutes and the liquor ratio 30:1.
Authors: Jian Chen
Abstract: Vinylidenefluoride (VDF) and chlorotrifluoroethylene (CTFE) copolymers were crosslinked by ultraviolet irradiation, chlorotrifluoroethylene content has a great influence on the crosslinked copolymers, high CTFE content support more joint pots, the properties of the copolymer shows higher storage modulus, the loss modulus gets smaller. The copolymer mechanical properties gets much higher.
Authors: Hui Li Qi, Ke Gai, Dong Ping Ma, Bo Zheng
Abstract: This paper presented a method of a new kind of triplex mixture system of oil-water-coal slurry preparation.Triplex synfuel containing gasoline, water and coal was prepared using nonionic surfactant. Tween 80 was used as emulsifying agent. The ratio of water, gasoline and coal was optimized. The optimum prescription of oil-water-coal slurry was obtained by means of orthogonal experiment. Results showed that stable triplex mixture systems were prepared with the ratio of the components of coal (C) to water (W) to oil (O) by weight was C:W:O=45%:30%:25% when 0.2% Tween 80 were added into the system. Rheological properties of oil-water-coal slurry were also investigated.
Authors: Ke Gai, Hui Li Qi, Dong Ping Ma, Wen Li Liang
Abstract: This paper is based on the research of the coal water slurry rheological property and stability. The influence of the concentration, additives and temperature on the rheological properties of the slurry has also been studied. The apparent viscosity increases with increasing concentration of coal water slurry, and decreases with increasing temperature. An introduction of additives can greatly improve the rheological properties of coal water slurry. The stability of coal water slurry increases with the increase of concentration, and the stability decreases with the increase of temperature. A proper amount of additives can improve its stability.
Authors: Min Xu
Abstract: based on Density Functional Theory, we investigated the optical structures and the electronic properties of Cu doped SnO2 with density of 12.5%, including band structure, the density of state (dos), Dielectric function and optical absorption spectrum. The results show that Fermi level access conduction band gradually with the doped density. It has enhanced the electrical and metal property of material. The peaks of reflectivity spectrum and absorption spectrum correspond density of state.
Authors: Chao Zhang, Xiao Fei Guo, Yue Ma, Xiao Yan Zhao
Abstract: The effect of ferulic acid (FA) and oxidized ferulic acid (OFA) on performances of the soybean protein-isolate/chitosan composite films was evaluated. The FA and OFA showed an excellent compatibility and miscibility of in the composite films, and leaded the surface more compact and smooth. The FA and OFA also enhanced the thermal stability of the composite films. The FA and OFA enhanced the performance of the composite films by raising the band energy of the crosslinked molecules.
Authors: Chao Zhang, Xiao Fei Guo, Yue Ma, Xiao Yan Zhao
Abstract: The effect of FA and OFA on performances of the soybean protein-isolate/chitosan composite films was evaluated. The FA and OFA enhanced the tensile strength and thermal stability of the composite films significantly, while they reduced the water vapor permeability to 60.3 % and 72.8 % of the control respectively. Moreover, the OFA was more effective to enhance the tensile strength of the composite films than the FA.
Authors: Wen Bin Liu, Adu, Yu Guang Lv, Li Li Yu, Yong Xiang Du, Wei E Wang, Chao Xing Wang, Ji Hui Zheng, Hong Bing Gao, Li Zhang, Di Song
Abstract: In this paper, a rare earth metal terbium ion as the central metal ion, a nanohydroxyapatite powder of the lanthanum doped terbium was synthesis by precipitation with hydroxyapatite as ligand. The sample was characterized by infrared spectrum, fluorescence spectrum and X ray diffraction instrument, and the thermal properties and fluorescence properties, structure of powderes were discussed. A nanohydroxyapatite powder of the lanthanum doped terbium achieves the maximum luminous intensity, when the La3+ doping concentration of Tb3+ was HAP 5% (La3+ and Tb3+ mole fraction ratio) devices. Rare earth powder of the lanthanum doped terbium hydroxyapatite has the stability chemical properties, the luminescence properties and good biological activity, the rare earth powder has good luminescent properties can be used in preparation of a good light emitting device. At the same time a nanohydroxyapatite powder of the lanthanum doped terbium has good antibacterial property, can be used as antibacterial materials.
Authors: Yang Shen, Yong Hong Liu, Hang Dong, Ren Jie Ji
Abstract: Experiments of high-efficiently compound machining (CM) combined by EDM and arc machining of AISI 321 stainless steel at 658mm3/min material removal rate (MRR) using solid electrodes of different materials and different diameters of less than 5mm were conducted. The CM process parameters, including electrode rotation speed, peak current, electrode materials and electrode diameter, were studied to evaluate the effect on MRR, relative electrode wear rate (REWR) and width of overcut (WOC). The re-solidified layer of 321 for CM was also investigated. Faster electrode rotation speed, higher peak current, larger electrode diameter and pure tungsten electrode material are essential to achieve lower REWR and higher MRR. The processing conditions were bad using electrode diameter of 2mm. The re-solidified materials are significantly more densely than base materials.

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