Advanced Materials Research Vols. 179-180

Abstract: Titanium substrate specimen was sputter-coated with SiC or CoCrNi-oxide thin film and the wear test was carried out by using a “ball-on-disk” testing machine. The semi-circular parallel cracks appeared on the film surface with the angles of 45 degree to the sliding direction of SiC ball and the delamination of film quickly occurred after cracking. In the same study we have discussed the reason of cracking and delamination in film by FEM [1], and made a special effort to the effect of friction coefficient on failure process of film in this paper. With the increase in friction coefficient the high-stress area of the maximum principal stress σ1 has the trend to move towards the central trail of back-contact-edge, while the positive minimum principal stress σ3 also appears at more extensive range, the higher friction coefficient causes the higher stresses and makes the cracking and delamination more easily, where the cracks can be initiated much more near the center trail.

Abstract: Boronizing of silicon steel is performed by electrodeposition in KCl-NaCl-NaF-Na2B4O710H2O molten salts with different amounts of borax. The effect of borax content on composition and microstructure of boride layer is studied. The compositional depth profile of boride layer is measured using the glow discharge spectrometry (GDS) and the depth from the surface to the substrate is taken as the layer thickness. The surface morphology is studied by atomic force microscopy (AFM). It is found that the thickness of the boride layer reached maximum values when the borax content is 0.05mol. The roughness decreases with raising borax content from 0.01 to 0.05mol while the further increase of borax content from 0.05 to 0.1mol results in increase of roughness. The boride layer formed at borax content 0.05 mol shows smallest values of surface roughness.

Abstract: Computer simulation techniques in atom scale have now become so powerful that phenomena associated with irradiation damage effects in metals can be modelled with a high degree of realism. As a powerful tool, molecular dynamics (MD) is applied to study the displacement cascades initiated by the neutrons when they interact with matter. There exist a lot of inter-atomic potentials dedicated to bcc Fe and we choose the EAM potential. At first time PKAs (Primary knock-on atoms) knocked on a atom and send a part of energy to it what result displacement cascades. After about several ps, a lot of atoms are knocked to leave the equilibrium position and became self- interstitial atoms (SIAs). A lot of equilibrium position became vacancies. Some SIAs and vacancies form dumb-bells structure. Several vacancies or SIAs assembled the clusters. In other papers we haven’t found about the SIAs and vacancies can be assembled the SFT-like clusters in bcc Fe. In our study, we occasionally find SIAs can assemble to form the cluster in bcc Fe but need a higher energy. In our study, we choose the temperature from 100K to 600K, the energy from 100eV to 20keV. The particles scale is about 300 thousands. In a series of experimentation we find that as the temperature increase as the number of the SIAs and vacancies increase too. By the same token, as the energy increase we will find the same result.

Abstract: Microporous silica material AMPS has been synthesized via TEA+ cations assisted self-assembly of silica species in acidic aqueous solution. Nitrogen adsorption analysis revealed 0.65 nm uniform micropores in AMPS, companied with a Langmuir surface area of 745 m2/g and a pore volume of 0.22 cm3/g. The microporous AMPS exhibited an excellent adsorptive performance for volatile organic compounds (VOC) such as cyclohexane and acetone, compared with conventional zeolites such as Y, ZSM-5 and A. The adsorption was rapidly saturated at lower relative pressure with higher capacities than that of conventional zeolites. These features implied promising potentials in the separation and removal of VOCs in the atmosphere by using APS-3.

Abstract: The Virtual Prototype of Engine Mounts System of a Certain Bus Was Established Based on ADAMS. and the Dynamic Characteristics of the System Was Simulated and Studied. and the Conclusion of the Damping Characteristics Was Drawn. it Is Shown that Damping Characteristics of the Engine Mounts System Can Be Improved Greatly and Resonance Should Be Avoided when the Parameters of Mounts Are Chosen. at the same Time Large Deformation Should Be Limited under Dynamic Load.

Abstract: Introduced field programmable gate array FPGA with I2C bus interface device interface design. Programming with VHDL, using general FPGA I/O port to generate I2C bus interface signal timing, achieved FPGA with I2C-bus devices data communication, went through the simulation test, given the application example of FPGA with I2C-bus EEPROOM chip AT24C02 connected hardware design.

Abstract: On the basis of AutoCAD, a visual casting process CAD system for copper alloy, using VC++.NET 2002 and re-development tool ObjectARX, is developed by key technologies including exchanging data between Access and MFC ODBC, graphics preview and real-time rendering. This system also accords with the national casting standards & requirement of a corporation, can realize real-time feedback in casting process design and improve the efficiency and accuracy availably.

Abstract: HFS+ file system is a file system of the Mac OS. In order to achieve data manipulation of the file system based on the Windows OS for further computer forensics, not only do we introduce the principle and structure of HFS+ file system, but also propose a efficient method to analyze the file system. Research contains the exploration of the file system and program implementation to analyze the file system.

Abstract: This paper constructs a common data fusion framework of fault diagnosis, by combining local neural networks with dempster-shafer (D-S) evidential theory. The RBF neural network is proposed as a local neural network of the fault pattern recognition, and its input vectors are extracted by the wavelet packet decomposition of various frequency energy. Then, the signal of each sensor separately has a feature level fusion. This method is effective, verified by experiments. The given decision level fusion is based on combining the features of the neural network and the D-S theory, and experiments show the results of the fault diagnosis are more accurate by this method.

Abstract: This paper demonstrates a method and its implementation on workers’ heart load affected by industry noise, and, to develop a related data processing system. Heart rate variability (HRV) is used as an assessment index. The affected regulation of human’s heart is obtained by large number of noise experiments. This method emphasizes the human heart load among the all factors of labor safeties, the noise influence discipline can be debated scientifically from both engineering physiology and psychology. The results show when to control the industrial noise it is much important to control the ingredient of noise main frequency not the audio-level.