Advanced Materials Research Vols. 335-336

Abstract: According to the shape character of some one steering knuckle the metal flowing and the defects of current process was analyzed and summarized. One upsetting step was arranged, then the current pre-forming process was modified to be half-closed extrusion process. As a scheme of different upsetting heights was designed, the simulations to pursue the influence of upsetting on half-closed extrusion got performed. A successful trial-production validated the process step in design and simulations performed.

Abstract: We selecte two bentonite products: activated clay and organo-bentonite, and introduce the related content of them like industrial applications, technology and raw materials of producting at the same time. After that, we choose the preparation processes of activated clay and organo-bentonite. Choose conditions of the prepared samples, arranging test methods by orthogonal test program, and preparing of the activated clay and organo-bentonite samples in accordance with the different test conditions. Finally, we draw this conclusion according to the test analysis and demonstration results. We propose the recommendations of the development of activated clay and organo-bentonite by Hongquan bentonite, pointing out that the shortcomings of this study and proposing pilot study of future.

Abstract: Magnetic pulse forming is based on the principle of generation of a repulsive force called, Lorentz force due to opposing magnetic fields of adjacent conductors. Magnetic pulse forming of light weight materials such as aluminum, magnesium has been studied by many universities, institutes due to its advantages. But magnetic pulse forming is a complicated research area involving different topics in electromagnetic mechanics, plastic working, and materials mechanics. Therefore, development of FE-model of magnetic pulse forming process is a useful approach for better insight into workpiece deformation mechanics with electromagnetic interaction and further provides design and quality control information. To successfully accomplish this objective, a 3-dimensional ax-symmetric electromagnetic numerical model has been developed. The equation was solved using a general mechanics computer program, ANSYS EMAG and LS-DYNA code.

Abstract: In this paper, ω-bromopropylporphyrin ether was firstly synthesized using 1,3-dibromopropane as bridge-linked group and 5-(4-hydroxyphenyl)-10,15,20-triphenylporphyrin (H₂MHTPP) as the matrix. The resulting compound was then reacted with 5,15-di(4- hydroxyphenyl)-10,20-diphenyl porphyrin (trans-H2DHDPP) to give a new title nanometer porphyrin oligomer. Characterization were made by the methods of elemental analysis, UV-vis, IR, ¹H NMR and XRD. Has studied the crystalline ,the fluorescence property and the heat-stable property of porphyrin monomer and porphyrin oligomer. The research discovered that the crystalline,the fluorescence property and the heat-stable property can have the very big change along with the porphyrin peripheral substitution groups as well as the oligomer formation. And the function of difference kinds of solvent and the porphyrin molecular structure symmetry also can have the very tremendous influence to the crystalline,the fluorescence property and the heat-stable property.

Abstract: This paper reports the structural behavior of precast lightweight foamed concrete sandwich panel, PLFP, subjected to eccentric loading. An experiment was conducted to investigate the structural performance of PLFP under this load. Two PLFP panels, PE-1 and PE-2 were cast with 2000 mm in heights, 750 mm in width and 100 mm in thickness. The thickness of the wall is actually a combination of three layers. Skin layers were cast from lightweight foamed concrete while the core layer is made of polystyrene. The skin layers were connected to each other by 9 mm steel shear truss connector which were embedded through the layers. Panel PE-1 was strengthened with single diagonal shear truss connectors made of 6 mm steel rebar while panel PE-2 was strengthened with symmetrical diagonal shear truss connectors of similar steel diameter. Both panels were tested under eccentric load till failure. The results showed that panel with symmetrical double truss connectors, PE-2, is able to sustain higher load compared to panel with single shear truss connector. The load-deflection profiles indicate that both panels achieved certain degree of composite action especially during the later stage of loading where the wythes tend to move in the same direction until they reached failure. The load-strain curves for both panels highlight the inconsistent distribution of surface strain along the height of panels. The overall trend of the strain curves show that they are under compression.

Abstract: Dye adsorption on Ti0₂ and electron transport in Ti0₂ film are the two critical factors in determining efficiency of the the dye sensitized solar cell (DSSC). Increasing dye adsorption which increases the light harvesting is usually achieved by using nanoporous or nanoparticle Ti0₂ films. Electron transport is determined by the inter-particle resistance of Ti0₂ film. Electrospinning is a viable method for forming porous structure materials with high surface area. In this study, it was found that electrospinning is able to achieve good solar cell performance due to the high electron transport caused by the pores in the Ti0₂ film.

Abstract: Abstract:Dealing with thallium-bearing materials by vacuum distillation under the condition of 400~700°Cand 10-60 Pa.Measured contents of Cd,Tl and Pb under these temperatures.Analzed relations between evaporation rate,residue duty of Cd with temperatures, and The relyations that between evaporation rate,evaporative duty of Tl and Pb with temperatures.Least square method is used to fit the relations and got that the most suitable temperature for evaporating Cd is 560°C;Analyzed the relations between the activity coefficients ratio of Cd-Tl system and Cd-Pb system and temperatures as well as mole fractions,also got fitted equations of them;Analyzed the relation between gas-liquid cotents of Cd-Tl,Cd-Pb systems and temperatures.It is valuable for extracting Tl,Pb with vacuum distillation.

Abstract: The quality of rural residential building products related to the construction pace of new socialist countryside in China. In order to improve the products quality, using the rough set theory, hierarchy evaluation model is established and analyzed. The step of the rural residential building products quality evaluation is given combined with an instance, and the quality evaluation value is also given quantitatively. The result shows that this method is intuitional, concise, quantitative and precise thereby it has the great merit of being applied widely.

Abstract: Pore structure is one of the main influencing factors of materials drying shrinkage. C30 natural mix proportion is used as reference, the impact of replacement rate of recycled aggregate, the mixing amount of fly ash, water reducer, expansion agent and water-cement ratio on recycled aggregate concrete’s porosity and pore characteristics was studied. Based on the pore structure theory, the influence of porosity and pore characteristics on recycled aggregate concrete’s drying shrinkage is analyzed.

Abstract: In order to analyze the characteristics of pile-soil stress ratio of the composite foundation of cement-soil mixing pile under flexible foundation, this paper points out the displacement mode of friction pile; According to the deformation characteristic of friction pile, ascertain the neutral point of composite foundation. And this paper also derives the exact formula about length-stress ratio which addresses the problem of soft soil foundation according to the deformation co-ordination conditions of the pile composite foundation. The calculation of actual example proves that the formula about pile-soil stress ratio is in accordance with actual measurement number. The pile-soil stress ratio which addresses the problem of soft soil foundation is generally between 2~4. If other conditions keep invariable, pile-soil stress ratio become big when cushion modulus become big. Cushion modulus effect the length-stress ratio greatly.