Applied Mechanics and Materials Vols. 380-384

Abstract: At first, this paper introduced some related domestic and global researches which are about lake basin transboundary water pollution, and put forward several basic assumptions combining the lake basin situation. Based on this foundation, this paper constructed the minimum cost of the whole region, and proposed the cooperation coordination model of the lake basin transboundary water pollution. Then it took advantage of Poyang lake for empirical analysis, and got the function of pollutant reduction cost and function of environmental damage cost by means of multiple regression analysis with the five main data of Poyang lake from 2001 to 2010. Next, through cooperation coordination model establishment and solution, the paper could get the conclusion that compared with the actual pollution reduction plan the model solution is better. At last, the paper talked about the deficiencies and improvement.

Abstract: A wireless and data store Holter prototype system is presented in this paper. Cardiovascular disease (CVD) clinical and home based healthcare is becoming more and more important. This Holter can acquire, preprocess, store and transmit ECG data by wireless interface. A MicroSD card is used for data store. It is easy to extend data store volume when longer record time is required. The abnormal ECG data blocks can be detected and give alarms to users based on MSP430 MCU preprocessing result. The data in MicroSD card can be transferred to other smart phone and portable computers by Bluetooth interface. This Holter system test result shows very low power consumption. It could be run under 6mA for data preprocessing and ECG data acquisition. With this low power design, the prototype system can keep working for more than 48hours.

Abstract: Due to its unique physical sound insulation performance, aluminum alloy foam has become one of the new decorative building materials. Research on its sound insulation performance has also become a hot topic of materials science and other fields. Firstly, the paper analyzes the acoustic characteristics and the analysis indicators of sound insulation materials through the analysis of aluminum alloy foam characteristics and sound insulation mechanism. It finally concludes impact factor of sound insulation based on the analysis model of physical characteristics of aluminum alloy foam and sound insulation mechanism which provides a theoretical basis for the application and development of the sound insulation materials in a certain extent.

Abstract: This paper discusses the synthesis and preparation of polyvinyl alcohol based nanocomposites through the use of miniature thermoplastics processing technology. It studies the influence of different process conditions, the amount of raw materials and water on the processing performance, tensile strength and elongation at break of polyvinyl alcohol based nanocomposites. Studies have shown that using two miniature thermoplastic processes does not have much influence on the mechanical properties of polyvinyl alcohol based nanocomposites, different amount of polyvinyl alcohol will lead to enhancement of the tensile strength of the polyvinyl alcohol based nanocomposites system by the increasing amount of glycerin, and the water content has a great influence on the performance of polyvinyl alcohol based nanocomposites. To this end, according to the analysis of experimental results, it can obtain preparation conditions and influencing factors of polyvinyl alcohol based nanocomposites with the miniature thermoplastic processing conditions, and provide a new theoretical method and means for nanocomposites.

Abstract: When seismic strengthening was analyzed, the traditional method always took a single construction member as the target, and it was hard to carry out with ineffective outcome of seismic reinforcement. A method of seismic strengthening buildings of concrete frame structure was proposed to solve the problem. The new method reinforced the buildings of concrete frame structure with CFRP (Carbon Fiber Reinforced Polymer), it took the system as the target to analyze and it was easy to carry out. With analysis and experiment, the new method showed improvement of seismic strengthening, and the Seismic average improvement of performance was about 25.85%. The simulation result shows nice performance in the engineering practice and it has effective application prospect in the future.

Abstract: In recent years, with the continuous improvement of the quality requirements of the plate heat treatment, the swing heated gradually become the focus of attention of many researchers. Based on the above considerations, in this paper, we established the furnace temperature pre-setting system, using the intelligence algorithm of improved PSO, under the premise of swing heating of roller-hearth normalizing furnace; and studied the optimal furnace temperature optimization curve, namely the optimal furnace temperature system, under the heat treatment process of the swing of the whole furnace and steel mixed. Through the Matlab simulation, we obtained the steel Temperature Prediction curve under the optimal furnace temperature system. By comparison, verifying the accuracy of the researched optimal furnace temperature optimization curve.

Abstract: The polycrystalline silicon films with same doping concentration and different thickness were prepared by low pressure chemical vapor deposition. The gauge factors of the films samples were tested, the results show that the piezoresistive properties of nanopolycrystalline silicon film (NPSF) exceed that of common polycrystalline silicon film (CPSF). To apply the NPSF to MEMS piezoresistive device effectively, the Youngs modulus of the NPSF were tested by in-situ nanomechanical test system, the results show that the Youngs modulus of the NPSF is about between 155GPa and 158GPa. It is very useful to investigate the piezoresistive and mechanics properties of NPSF, the results show that NPSF is a suitable material in MEMS piezoresistive device.

Abstract: This experiment takes the X80 pipeline steel as the research object, the thermal stability second phase particles which would not be dissolved or aggregated at high temperature will be expected by means of adding nanocalcium oxide into the steel with the method of carrier dispersion addition. The effect of nanocalcium oxide addition on the cast microstructure of X80 pipeline steel was analysed. The results show that the cast microstructure is consist of the ferrite and a small amount bainite. And the bainite is distributed at the boundary of the ferrite grains. When adding 0.02 wt% nanocalcium oxides, there is more bainite in the microstructure by contrast. The number of the acicular ferrite significantly increases in the cast microstructure, and the grains become more fine and uniform. Simultaneously, the granular bainite is uniformly distributed at the grain boundary and edge of the ferrite.

Abstract: Nanometer calcium and magnesium oxides were added into molten steel by the carrier method in the experiment. The experiment takes the X80 pipeline steel as the research object and analyses the effect of nanometer calcium and magnesium oxides addition on the cast microstructure grain size. The grain size of the cast microstructure in each sample was measured by the cutting line method. The results show that the nanometer oxides addition has a great influence on the cast microstructure grain size. When adding 0.01 wt% nanoCaO or MgO oxides, the grain size decreases from 0.664 mm to 0.632 mm and 0.457 mm, respectively. When adding 0.02 wt% nanoCaO or MgO oxides, the grain size becomes finer, and the cast microstructure is remarkably refined. In contrast with the grain size of no nanometer oxides addition, the grain size decreases from 0.644 mm to 0.438 mm and 0.389 mm and is refined by 1.47 and 1.66 times, respectively. When adding 0.05 wt% nanoMgO oxides, the grain size does not decrease, but increases to 0.778 mm. The reason is that as the amount of adding oxides increases, the dispersity of the nanometer oxides becomes worse, and the agglomeration of the grains occurs. Therefore, the nanometer oxides can not achieve the role of grain refinement.

Abstract: Preparing of cool wool from coarse wool fiber is a feasible and effective method. The preparation principle, process and properties of cool wool fiber was studied during chlorination treatment with sodium hypochlorite. The optimum chlorination treatment process was as follows: concentration of sodium hypochlorite at 4g/L, concentration of sulphuric acid at 20g/L, time 15min, temperature 20°C to 25°C, ratio of water and wool fiber was 50:1. Compared with original wool fiber,the surface of cool wool only retained scales roots and the cuticle becomes thinner. Handle, softness, whiteness, luster and the anti-shrinkage properties were improved, the breaking strength is decreased about 5% to 8%.