Applied Mechanics and Materials Vols. 490-491

Abstract: On the basis of the analysis of phenomenon, taking place when polymer material are in aggressive mediums and on the basis of experiments chemical influence on polymer workplaces before by cutting was proved. The analysis of phenomena taking place when polymers interact with aggressive mediums has been made. Corresponding experimental research has been done and methods to direct changes of proceed material have been developed. The changes happen when the surface layer is processed preliminary to lower resistance to destruction of workpiece surface layer when it interacts with cutting instrument later.

Abstract: The material removal mechanisms for Cu electrochemical mechanical planarization (ECMP) including 5-Methyl-1H-Benzotriazole (TTA), hydroxyethylidenedi phosphoric acid (HEDP), and tribasic ammonium citrate (TAC) were investigated by electrochemical techniques, X-ray photoelectron spectrometer (XPS) analysis, and polishing of Cu-coated blanket wafers. The experimental results show that the main factor affecting the thickness of the oxide layer formed during ECMP process is the applied potential. This understanding is beneficial for optimization of ECMP processes.

Abstract: Three heat pipes with nanofluids of Al₂O₃-water, CuO-water and SiO₂-water were tested experimentally. The temperature distribution of their start-up process was analysed, and compared the heat pipe with water. The results showed that the start-up way of heat pipe filled with nanofluids was coincident, the heat pipe filled with nanofluids showed a lower start-up temperature and a shorter start-up time in evaporator section compared with heat pipe filled with water, the temperature drop between evaporator section and condenser section for the heat pipe filled with nanofluids were reduced by 2-5°C than that of the heat pipe filled with water. The effect of the length of the heating section of heat pipe filled with nanofluids on the start-up process was little.

Abstract: For revealing the forming mechanism in micro level and for establishing the relationship between macroscopic deformation and microscopic changes, impact experiment of material property is conducted under the high speed cold roll-beating condition based on the plastic deformation mechanism of metal material, Based on the Zener-Hollomon constitutive relation, the macro change model is established, and the parameters of the 40 Cr are obtained according to the experimental data. Based on the model of microstructure evolution of dislocation density, the relation between macroscopic change and microscopic change is established, which provides the theoretical support for the forming process in micro level and revels the relationship between macro deformation and micro changes in the forming process of high speed cold roll-beating.

Abstract: In this study, we compared two types of nanostructured electrodes with gold nanocolumns and flat gold electrodes by measurements with doxorubicin. Nanostructured electrodes were fabricated by electrochemical anodic oxidation followed by deposition of gold to the porous alumina. Flat gold electrodes were fabricated by physical evaporation of gold layer to the silicon substrate. All electrodes were characterized by electrochemical impedance spectroscopy and then the electrochemical determination of doxorubicin was studied by differential pulse voltammetry. The impedance spectroscopy measurements proved a bigger electroactive area for nanostructured electrodes. The gold nanocolumns have been found as an important factor in increasing of electrodes active area. This fact is very important for sensors sensitivity. Fabricated electrodes were successfully used for determination of doxorubicin.

Abstract: Taking aim at the actuality of machining technology in our country, this study describes a new technical equipment of abrasive suspension jet. This paper introduces the theory basis of the technical and the system work principle ， the primary cut performance and influence factors about this technology are grasped by a series of tests and analysis .

Abstract: Transparent electrodes are used widely for the many kinds of devices. The most widely used material is ITO (indium tin oxide). The attempts to improve the resistance and flexibility have been tried. The low resistance can be achieved by increasing the thickness of the ITO; however, the increase of the thickness results in the decrease of the transmittance of the incident light. Therefore,decrease of the resistance is required without increase of the thickness. We investigated the effect of the metal material on the resistance of the transparent electrode. After deposition of the metal on the ITO, we investigated the resistance of the electrode after annealing. The lowest sheet resistance was obtained for the metal Mo after 500 °C annealing. The sheet resistance 25.6 Ω/ of the ITO was decreased to 9.6 Ω/ without any significant decrease of the transmittance.

Abstract: Monitoring body fluids such as sweat composition can provide useful information about the physiological status. Physiological monitoring of body fluids such as sweat with a textile-based system has the advantage of being non-invasive and easily accessible and such monitoring is beneficial to indicate information about body's physiological status. In the present study, it is aimed to design a textile-based system with non-invasive methods which can be used to monitor a sportsman's performance. A novel, disposable and wearable biochemical analytical device was designed and fabricated by patterning micro channels and reservoirs using SU-8 photoresist through photolithography technique on an absorbant bicomponent Evolon® nonwoven substrate. It was obtained that hydrophilic reservoirs were well defined and demarcated by hydrophobic barriers. Therefore, no liquid leakage was observed around the reservoirs which was crucial for achieving a proper enzyme immobilization and the successful detection of the color change after the simulated sweat was deposited on the hydrophilic reservoir areas. Analyte optimization studies revealed that color change became more evident with the increasing analyte concentration until 20 mM and started to decrease with further increase due to analyte inhibition. Also, on textile fabrics, color densities started to decrease after 40 mM analyte concentration.

Abstract: Using screw injecting molding method to prepare the short fiber strengthening thermo plastic resin composite material, using short carbon fiber as strengthening material and polytene resin as matrix. Study different influence of carbon fiber content to the hardness of short fiber strengthening thermo plastic resin composite material. The result shows that the hardness of short carbon fiber strengthening thermo resin composite material increase as increasing the short carbon fiber content.

Abstract: Recently, as the development of thermoplastic resin with excellent property and forming process of thermoplastic resin composite material, research of thermoplastic resin becomes a hot issue in related areas. Comparing with common composite material, thermoplastic resin composite material has many advantages, such as, excellent impacting resistance and many processes. So, more and more researchers focus in thermoplastic resin composite material. In this article, applications of carbon fiber strengthen thermoplastic resin composite materials are comprehensive.