Mechanical Engineering, Materials and Energy

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Authors: Chao Feng Li, Qin Liang Li, Jie Liu, Bang Chun Wen
Abstract: Multi-DOF model of double-disc rotor-bearing system taking crack and oil film support into account is established, and the continuation shooting method combined with Newmark is also applied to stability analysis of continuous system. This paper mainly studied the variation law of five parameters domain in crack depth and location, then a number of conclusions are found: first, it’s feasible to study the stability of nonlinear rotor-bearing system with crack faults using FEM; secondly, the crack depth and location has a certain impact on instability speed, but the impact is not great and owns its certain law. As the crack depth and location is getting close to the middle position of rotor, due to its impact on the oil film support, the instability speed of system increases. This method and results in this paper provides a theoretical reference for stability analysis and vibration control in more complex relevant rotor-bearing system with crack fault.
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Authors: Wei Chang Feng, Xiao Meng Chen
Abstract: E-Yuan multimedia system is developed for the rich audio and video resource on the Internet and on its server side, it can automatically search and integration of network video and audio resources, and send to the client side for the user in real-time broadcast TV viewing, full use of remote control operation, Simply it’s a very easy to use multimedia system. This article introduces its infrastructure, main technical ideas and you can also see some details about server side and client side.
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Authors: C.N. Ashok Kumar
Abstract: Punch force is an important factor in the sheet metal forming operations. The amount of force is mainly based on the material type, shape, size etc. The analysis on theoretical Vs actual forces is playing an important role in the optimization of the sheet metal forming processes. The total press tonnage will be based on the punch forces. Also the type of the die is a key factor in the actual force. In this study, the combination die is designed and fabricated to manufacture the U clamps. The die is used to form the U clamps by using mild steel and aluminum sheets. The punch forces are analyzed in various aspects.
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Authors: Rui Jing Su, Wen Feng Zhang, Peng Hui Shi, Min Cong Zhu, Deng Xin Li
Abstract: Graphene oxide was used as substrate for immobilizing alkaline protease. The immobilizing conditions were optimized though single-factor test and orthogonal design. Then the activity recovery was raised to 92.0% and 70.1% in the optimum conditions of immobilization. The test indicated that the optimum technics were as follows: the enzyme amount to 1 mg carriers was 500µl, the concentration glutaraldehyde is 1%, pH was 8.0, temperature was 25°C, crosslinking time and absorption were 4 hours and 1 hour, respectively, the recycling rate of activity (RRA) reached 70.1%.
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Authors: Xing Zhi Wang, Yong Shuai, Fu Qiang Wang, Chun Liang Yu
Abstract: Depending on the solar radiant flux and velocity measured in Harbin, with finite element method, use a modified radiant heat flux function to calculate the temperature field of a plate on the focal region of a dish solar concentrator. Compared the result with picture taken by infrared camera, there is a good accordance between them. The temperature field is used as the loading parameters to calculate the thickness’s impact on the thermal stress field in the plate. When the value of the thickness increases, the maximum values of the stress increase, but the overall stress field tend to decrease.
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Authors: Kang Yuan, Ru Lin Peng, Xin Hai Li, Sten Johansson
Abstract: High-cycle-fatigue (HCF) fracture mechanism of nickel-based superalloy IN 792 coated with Pt-modified aluminide outward-diffusion coating is studied with focus on the influence of coating cracks. It is found that cracking of the diffusion coating prior to HCF tests has little influence on the fatigue limit of specimens with thin coating (50 μm) but lowers the fatigue limit of specimens with thick coating (70 μm). By fractographic analysis, three types of fractural modes are established according to their crack initiations: internal, external and mixed. While external fractural mode is related to the propagation of existing cracks in the coating, internal facture initiates often at Ti-Ta-W-rich carbides and/or topological-close-packed (TCP) phases and grainboundaries in the superalloy. Increasing the thickness of diffusion coating or the amplitude stress promotes the fractural mode transition from internal/mixed to external. The influence of precracking of coatings on the HCF fracture mechanism can be qualitatively explained by its influence on the stress intensity factor.
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Authors: Gai Ling Fan, Zhi Hua Huang
Abstract: EEG (electroencephalography), as a noninvasive and inexpensive method, is widely used to measure brain function and make inferences about regional brain activity. The stationarity of EEG has been investigated by many researchers, while the stationarity of EEG segment with ERPs (Event-related Potentials) has hardly been concerned about. It is necessary to analyze the stationarity of this kind of EEG. In this paper, we concentrate on the stationarity of the EEG with ERPs by testing the stationarity of 500ms EEG segments with ERPs recorded from six subjects in two types of experiments. The results suggest that selected EEG segment whose length is larger than 190ms remains to be stationarity and all epochs duration less than 40ms is considered to be stationary, whichever channel the data is from and whatever type of cognitive task is performed in the experiment. This is an obvious difference between the stationarity of EEG with ERPs and that of EEG, which is reported to be stationary as long as its length is less than 12s.
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Authors: Hua Xing Qiu, Xian Jun Hu, Shao Hui Chen, Feng Fang
Abstract: Abstract:To control the oxide scale on high carbon steel during the manufacture of high carbon steel wire, the structure and the growth process of oxide scale were investigated by using X-Ray Diffraction (XRD), Scanning Electron Microscope (SEM) , Laser Raman Spectroscopy (LRS) and TGA system. Experimental results show that oxide scale on high carbon steel has a three-layer structure. The oxide scale growth on high-carbon steel can divide into three stages. 1) The growth rate is slow below 780°C. 2) The growth rate increases obviously between 780°C and 950°C and 3) sharp increase beyond 1000°C. The oxidation of high carbon steel obeys a linear law at first and a parabolic law is followed with the increase of oxidation time. The oxide temperature has great effected on the thickness of oxide scale. The proportion of wustite in oxide scale increases with both the oxidation temperature and oxidation time.
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Authors: Bao Liu, Si Xiang Zhang, Wei Zhou
Abstract: A new effective imaging detecting system has been used to determinate of intracellular calcium. The fluorescence Image acquisition and analysis was realized with fluorescence imaging detecting system. A designed microfluidic chip has been built. Cell fostering, staining and other operations can be implemented on it. Based on it, a new detecting means was developed for fluorometric measurement. The concentration of intracellular calcium ion can been calculated by using the fluorescence ratio method. A series of experiments were performed by using the detecting system. The experimental results show the ratio of fluorescence intensity was positively correlated to the raising temperature and enhancing shear stress.
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