Advanced Materials Research Vols. 430-432

Abstract: Aiming to improve the crack-resistance of the mould of ceramic mould casting, glass fibers whose average diameter was approximately 16 µm, length 1mm were dispersed, and the effect of the glass fibers on the tensile strength and shrinkage rate of the ceramic mould was investigated in this study. In the ceramic green body, quartz sand was selected as refractory, silica sol was binder. The results show that, with increasing glass fiber, the tensile strength of the ceramic mould increased linearly from 0.175 MPa to 0.221 MPa at the same sintering temperature, and the shrinkage rate fell from 1.37% to 1.33% at room temperature. With the sintering temperature rising, the tensile strength increased and the shrinkage decreased by the glass fiber dispersion, but their variation rule were not changed. The investigation proposed a new method to improve the crack-resistance of the ceramic mould, i.e., glass fiber dispersion into the ceramic mould.

Abstract: The spinning technology flow of St.Ma/polyester blended slub yarn is introduced. The spinning technique is researched according to the characteristic of the fibers. Since the less curl and instability of the St.Ma fiber, low friction coefficient between the fibers, small cohesion during spinning, especially the uneven distribution of twist from slub yarn, which more easily leads to the hairy yarn,in the spinning the technical measures are taken including, using high-qualified traveller with large channel and shorten the replacement cycle of traveller to ensure a clean cloth.

Abstract: The Al2O3-Supported Ni Catalyst was prepared by chemical reduction method, and take benzaldehyde as catalytic hydrogenation model to explore the effect in catalytic hydrogenation of benzaldehyde at different time and temperatures. The results show that the best temperature is between 60°Cand 80°C, and the catalytic time is about 1-2 h. Furthermore, the catalytic effect of Ni-Co/Al2O3 is best, it should be due to Co and Ni forming to alloys and obtain the function of the dual catalyst, which is conducive to benzaldehyde was activated and forming benzyl alcohol.

Abstract: This paper presents a general approach for automating the process of constructing 2D CAD models of human teeth. The generated CAD models are parametric models taking tooth type, cross sectional directions and measurements as parameters. The outline of the tooth models are composed of smooth cubic spline curves. Before generating 2D surfaces for tooth parts, the information of the generated spline curves is retrieved for correctness checking. The approach is implemented into C language and Pro/toolkit for automatically generating CAD tooth models.

Abstract: Ink-jet printing technology has been applied in producing PCB, but it hasn’t formed a large-scale industrialized production in general. This paper summarizes the types and problems of consumables of ink-jet printing in producing PCB.

Abstract: This paper introduces the fabrication method of a kind of gas phase phosphorus heavily-doped float zone (FZ) silicon, including thermal field design (electromagnetic copper coil with double water cooling system). This method solves the problems during the pulling process of heavily-doped FZ silicon crystal of phosphorus doped. The gas phase phosphorus heavily-doped FZ silicon crystal using this methods with low oxygen content (less than 0.2ppma),low radial resistivity variation (less than 10%), low resistivity (the minimum of 0.002 ohm.cm), and is good to meet the transient voltage suppressor (TVS) for silicon substrate material requirements.

Abstract: By analyzing the relationship between nanotechnology and medical science, especially nanotechnology and acupuncture, the application of nanomaterials for needling therapy, acupoint catgut embedding therapy, acupoint external application, acupoint injection therapy, and meridian point diagnosis were discussed. Nanomaterials will make the development of acupuncture possess an unprecedented domain. It’s pointed out that breakthrough will be achieved from the research of the application of nanomaterials on the development of nano-needles for needling therapy, nano-thread for acupoint catgut embedding therapy, nano-medicine for acupoint external application therapy, nano-drug carrier for acupoint injection therapy, nano-sensor for meridian and acupoint diagnosis.

Abstract: LiFePO4 material was synthesized at 650°C in an N2 atmosphere using a sol-gel method. This material showed a well developed XRD pattern (orthorhombic structure, Pnma) without peaks at 2θ=41°, indicating the absence of FeP or metallic Fe2P impurities. The Li/LiFePO4 cell showed a high initial discharge capacity of more than 140mAh/g and no capacity decrease until the 50th cycle (>99.0%).

Abstract: Studies have been carried out on removal of Se(Ⅵ) from raw water by ion exchange process. The experiment results indicate that employment of strong-base anion exchange resin of 201×7 can receive a desirable result for Se removal. It is particularly true that the removal rate of Se(Ⅵ) can achieve more than 96% when the Se(Ⅵ) concentration in raw water is 100μg/L. This allows selenium concentration of the supply water in full conformity to the quality standard currently available for drinking water. Ion exchange process for Se removal has been proved to be competent for its efficiency, cost effectiveness and easy operation.

Abstract: In order to disclose the mechanism of the mandrel on the thickness and profile of shear spun parts, the spinning processes with a mandrel or not were analyzed, and the distribution and variation of strain and stress were also investigated by experiment and finite element method. The results show that the thickness without mandrel is larger than that with mandrel on the whole. From bottom to top of spun part, the thickness with mandrel decreases gradually, while that without mandrel decreases at first and then increases. The linearity of part spun with mandrel is better than that without mandrel, but the tendency of the flange keeping backward and wrinkling of the former is larger than that of the latter. There is little difference in shear strain between parts with mandrel and mandrelless. In the midst and final stage, radial tensile strain and axial compression strain of part spun with mandrel increase sharply, while radial tensile strain without mandrel increases a little. So the wall of part spun with mandrel is thinner than that without mandrel. It’s feasible to spin without mandrel for the part with a thicker wall at opening end and no high demand for the linearity, or the linearity of the part can be improved by subsequent spinning.