Recent Trends in Materials and Mechanical Engineering Materials, Mechatronics and Automation

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Authors: Xiu Fang Zhu, Wei Zhou, Hong Xia Zhang, Yu Jing Nie
Abstract: From the point of view of molecule design, pH/temperature responsive hydrogels were prepared based on the acrylic acid with the excellent pH sensitivity and N-isopropylacrylamide (NIPA) with the excellent temperature sensitivity by the traditional radical polymerization. Study focus on the swelling of the hydrogels, measurement of the swelling and deswelling under different ionic strength with various temperatures of the hydrogels were performed in our work. The results show that the ionic strength, the pH value and temperature are three key factors that affect the LCST of the hydrogel. In the same pH buffer solution, the swelling ratio decreases with temperature rises, and the ionic strength greatly affects the swelling of the pH temperature responsive hydrogel, the higher the ion concentration is, the lower the swelling ratio and the LCST are.
Authors: Jie Lu, Zheng Xia
Abstract: A binary Cu–Ni alloy (69.93 wt. % Ni+Co) has been investigated as a potential inert anode in a laboratory electrolysis cell. When the electrolyte temperature, electrolyzing time and polar distance were set to be 960 °C, 4 h and 3 cm respectively, the corrosion resistance of Cu-Ni alloy materials in aluminum electrolyte was studied in the electrolyte composed of synthetic cryolite, alumina, aluminum fluoride, magnesium fluoride, calcium fluoride and aluminum by changing the molecular ratio of electrolyte, the concentration of alumina and current density of electrolyte, respectively. The results shows that the Cu-Ni alloy materials could reduce material loss when the electrolyte is with the optional conditions of the content of alumina in electrolyte approaching to 6 wt. %, the molecular ratio at about 2.2 and current density near to 0.5A/cm2. Thus the corrosion ratio of Cu-Ni alloy per year was measured to be 1.27cm/a.
Authors: Juan Wang, Jie Lu
Abstract: This paper analyzed the grade of iron and sulfur of cobalt concentrate in an iron in the past decade. The utilization of the magnetic separation technology for treating cobalt concentrate was carried out the techno-economic analysis. It was indicated that the cobalt concentrate quality had been improved significantly after magnetic separation; the grade of cobalt has been increased for 0.08 percentage points higher and the sulfur 3 percentage points higher. The recovery operations of cobalt and sulfur were 83.1% and 80.6% respectively, and the product yield of the magnetic was 27.85%, the grade of iron was 42.63% and the sulfur was 17.76%. According to the actual production data in 2009 and the experimental data of magnetic treatment of cobalt concentrate, the benefits of treating cobalt concentrate were calculated. The results showed that 5.342 million was increased for the sales and more than 4.6 million was increased for net returns by the magnetic treatment of cobalt concentrate.
Authors: Ling Fei Xu, Wu Sen Li, Shi Xue Xu, Jia Li, Yong Qing Wang
Abstract: The flame of basic oxygen furnace is the most important evident in the steel making process. This studies dividing the flame’s spectrum into two parts: the background spectrum and the characteristic atomic emission spectrum. Compared the figure of the characteristic atomic emission spectrum measured by spectrometer with the Gaussian function, the conclusion shows that the background spectrum could compensate the loss of the light intensity which due to the stimulated absorption of characteristic atomic. Based on the FES ( flame emission spectrometer) and spectrum in the BOF’s flame, the studies deduce a new relationship between the intensity of characteristic atomic spectrum and the temperature of the flame. The results indicates that the temperature measured by FES is inosculated to the temperature obtained by converter sublance comparatively.
Authors: Xiao Zheng, Ya Xin Zhang, Guo Xiang Lin, Zhi Xian Sun
Abstract: The experiments for stress—strain and confined pressing of granular peanuts by uniaxial pressing were carried out. The results show that granular peanuts conform to the model of three power curve. By using of Kuhn`s yield criterion, plasticity constitutive equations of granular peanuts were developed. The model parameters were determined from experimental stress—strain curve using an inverse method. The maximum relative deviation between the measured and the simulated value of strain is 5.4%, and the average relative deviation is 3.5%. Results indicated that the plasticity constitutive equations can describe the plastic deformation for extruded peanut, and Kuhn`s yield criterion can be used as theoretical basis for plasticity model of granular peanuts.
Authors: Yong Ming Wang, Fei Han, Jin Zhong Yu
Abstract: Along with the rapid development of network information technology, e-commerce is playing an important role, and it is urgent for small and medium-sized enterprises to participate in enterprise dynamic alliance. By using ASP.NET technology, this paper developed a web-based partner alliance management platform, and introduced its architecture and main functional modules. Some key technologies of this platform were discussed, including platform role description and use case analysis, partner evaluation and selection method, network security techniques of this platform and so on. Finally, an applied case of partner alliance management platform is given, which is beneficial to attract small and medium-sized enterprises to take part in enterprise dynamic alliance, thus can realize sharing and integration of resources information among them and improve their competitiveness.
Authors: Lian Fen Huang, Xiao Nan Cui, Jian An Lin, Zhi Yuan Shi
Abstract: Because human visual perception is highly adapted for extracting structural information from a scene, but the existing SSIM index is a full reference method which needs entire information of reference images. In this paper, we develop a reduced reference SSIM method and evaluate its performance through a set of assessment criteria, as well as comparison to both EPSNR and SSIM methods on a database of images compressed with JPEG and JPEG2000.
Authors: Su Mei Zhang
Abstract: The purpose of this study was to provide a unified modelling framework of Product Lifecycle Management (PLM). Firstly, the paper presented a Total Object Unified Model(TOUM) method which was used to abstract the concepts of manufacturing domain, format the meta-model of manufacturing data, construct the data model of PLM; Secondly, this paper presented three kinds of architectures based on TOUM to unify and simplify model, which are development architecture, deployment architecture and application architecture. At last, a model instance applied in a PLM product-CAXA V5 was shown based on the method of TOUM to confirm the validity of this method. This paper has provided a reference operation model and method for Product Lifecycle Management.
Authors: Ling Cheng, Zheng Nan Chen, Jian Gao
Abstract: By the finite element analysis codes ABAQUS and the function of RESTART, a sequential coupling calculating program for creep based on welding residual stress has been developed by establishing the model of temperature field, residual field and creep analysis. The welding residual stress and creep of welded joint for Cr5Mo furnace tubes was simulated by the program. This method established the basis for calculating the effects of welding residual stress on the creep of welded joint. A creep comparison between the welded joint tubes with welding residual stress and with internal pressure was made in the paper. The results show that although the residual stress is greatly decreased due to the creep relaxation behavior at high temperature, the initial welding residual stress has a great influence on the tube creep. The research results provide a reference for strength design of high temperature components.

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