Advanced Materials Research Vols. 430-432

Abstract: The oxalic acid treated HZSM-5 zeolite was used as support for TiO2 prepared by sol-gel method. Photocatalytic activity of the zeolite and the loaded TiO2 were studied. Decoloration on HZSM-5 under UV irradiation was quite small at even very high HZSM-5 concentrations. Methyl orange can be adsorbed on surface of HZSM-5, and the zeolite can subsequently have minor photocatalytic activity. TiO2 content in the supported TiO2/HZSM-5 is also a key factor influencing photocatalytic activity of the supported TiO2. The TiO2/HZSM-5 containing 60% of TiO2 showed the optimal activity for samples supported on every concentration of oxalic acid. The 0.3 mol/l oxalic acid treated HZSM-5 supported TiO2 has the maximum activity.

Abstract: Cerium and nitrogen co-doped TiO2 nanocrystals were synthesized by a simple sol-gel process, using tetrabutyl titanate as the raw materials with (NH4)2Ce(SO4)3 and urea as ion donors. The co-doped TiO2 nanoparticles were characterized by X-ray diffraction and transmission electro microscopy. The photodegradation of glyphosate has been investigated in aqueous suspensions of doped TiO2 under visible irradiation. The results exhibit a higher thermal stability of anatase than pure TiO2.The uniform test results show the optimal conditions: nCe/nTi nN/nTi and calcining temperature was 0.08,0.01 and 800°C. The highest degradation rate for co-doped TiO2 show five times photocatalytic activity of Degussa P25.

Abstract: As the intellectual economy’s growing up, knowledge management becomes the main attraction to people gradually. Knowledge management is a kind of complicated system network, as an intensive professional knowledge service tissue---it’s profound nowadays for universities carry out knowledge management. Currently the core of knowledge management in Chinese universities is intensive knowledge management. For time is still short since knowledge management started to be carried out, so there’s no organized, completed theory about universities’ intensive knowledge management. This article mainly discusses the of college intensive knowledge management essentials, analyzes the problems existing on the whole management process and provide some strategies on it.

Abstract: The dynamic explicit finite element software DYNAFORM was used to simulate the real and equivalent drawbead model. Analyzed the influence of the blank hold force (BHF) and virtual velocity on blank’s deformation behavior after passing through drawbead, compared the results of the FE simulation. The simulation results were confirmed by experiments. The study shows that the equivalent drawbead model can’t simulate the blank’s behavior precisely when it passing the real drawbeads, the effect of BHF on real drawbead model is larger than equal drawbead model; the proper range of virtual velocity was obtained at the same time.

Abstract: Tube drawing is a convenient route to manufacture near net tubular product with high accuracy. In this paper, the tube drawing process was investigated through finite element method. The metal flow rule of tube drawing and influence of mold conical angle on the drawing force and equivalent strain during tube drawing process were studied. The reasonable mold conical angle was obtained from the simulated results.

Abstract: The effect of the different addition amounts of polypropylene fibers on the basic mechanical properties of concrete were investigated in this paper. The results show that the flexural tensile strength of concrete changed slightly after adding low-dosage polypropylene fiber(0.04%～0.16%); Axial compressive strength and flexural tension modulus decreased, limiting flexural strain increased gradually with the amounts of fibers rising.

Abstract: With the popularity of various social media website, currently, lots of social images attached with different kinds of metadata have been uploaded to social media websites. Mining useful knowledge from social images has been an emerging important research topic in web search and data mining. In this paper, we propose a novel approach to find geographical difference of a given concept from social image community. We put a given concept to social image community, and then downloaded social images with metadata, particularly, the place where the photo was taken should be provided in advance. Firstly, concept is submitted to social image community, and then social images with different kinds of metadata are downloaded. Secondly, social images are clustered according to metadata of images. Finally, the information of concept’s geographical difference is found. Experiments conducted on social image community proof the effectiveness of our approach. Keywords: Social Images, Data Mining, Social Image Community, Image Clustering.

Abstract: In this paper, one kind of agriculture machines with picking and separating soil was designed to collect corn stubble. The core component of the machine is the frame of corn stubble-collector. The 3-D solid model of the frame of corn stubble-collector was designed using Pro/Engineer software. The first 10 natural frequencies and vibration modes of the frame were obtained by means of the finite element modal analysis in the ANSYS-Workbench software, and analyze the dynamic characteristics of the frame, which can be used to provide some theory basis for design and optimization of the frame.

Abstract: Starch/Styrene Butadiene Rubber (SBR) biocomposites were prepared by directly blending of starch and SBR on a two-roll miller. Two types of starch: pure starch and modified starch (M-starch) were used as rubber fillers. M-starch were synthesized by grafting of methyl methacrylate (MMA) monomer onto starch backbone using ceric ammonium nitrate-initiated radical polymerization. Coupling agent styrene-g-(maleic anhydride) (SMA) was used to further improve the interfacial interaction between the filler and rubber matrix. The morphology and mechanical properties of unmodified starch/SBR and M-starch/SBR biocomposites with SMA content of 0, 1, 3, and 5 phr were investigated. SEM observations showed the particle size of M-starch decreased and their dispersion in the SBR matrix significantly improved than unmodified starch. Mechanical properties of M-starch/SBR biocomposites were superior than those of unmodified starch/SBR biocomposites.

Abstract: Auditory model is a signal analysis system with simulating the mechanism of the human auditory system, and it is not only suitable for speech signal but also vibration signal for mechanical faults diagnosis. In this paper, the work of analysis and comparison for EA and ZCPA auditory model is done. The reason and characteristics of simulation mode of auditory nerve in two auditory model is illustrated. By analyzing vibration signals of different rotor faults, the performances of distinguishing different faults and stability for one kind fault for two models are compared. The results show that ZCPA model is more flexible and stable.