Advanced Materials Research Vols. 466-467

Abstract: A new polymeric membrane sensor for Al³⁺ based on bis(benzoin)-1,2-phenylenediamine as a neutral carrier was investigated. The proposed sensor exhibits a near-Nernstian response for Al³⁺ over a wide linear range of 3.0×10^-7 to 1.0×10^-1 mol/L, with a detection limit of 1.0×10^-7 mol/L and a slope of 19.7±0.3 mV/decade. The sensor displays a good selectivity toward Al³⁺over other cations in pH range of 2.5 to 4.0. It has relatively fast response time (8 s) and can be used at least for 3 months without considerable divergence in potential. The response mechanism was discussed in view of the A.C. impedance technique. It was successfully used as an indicator electrode in the determination of aluminum in real samples.

Abstract: To make Power system safe and stable, corrosion of grounding grid has become one of the most threatened phenomena and problems. With the object of reducing work force and diagnosing the corrosion situations more quickly and exactly, a new method has been proposed based on blocking way with dynamic self-adaptive PSO. First, irregular grids are supposed to be separated into several regular blocks. Then the diagnosis equations will be constructed so that the original ill conditions can be reduced and the solution accuracy will be increased as well. Accordingly, the problem of solving equations should be changed into optimizing solution of problems. In this paper, a new method called Dynamic Self-Adaptive Particle Swarm Optimization (DSAPSO) is proposed, which utilizes an average rule to estimate the whole swarm to divide it into three parts of different conditions, which are called excellent part, self-adaptive part and also worse part. Such a standard principle is based on the evaluation of fitness. Aiming at different groups, their speeds and positions will be updated with different parameters. And also a self-adaptive method has been added into regulation of parameter. Furthermore, such a dynamic method will do favor in increasing the global searching ability and avoiding from calculating complexity. Eventually, the effectiveness and accuracy of the method is verified by the application in a power station in Jilin Province.

Abstract: In this paper, the penetration effect of a rhombic fragment penetrating sandwich in an oblique incidence with 30º impact angle at the velocity of 300 m•s^-1, 350 m•s^-1, 400 m•s^-1, 450 m•s^-1, 500 m•s^-1 and 600 m•s^-1 is simulated by LS-DYNA. The dynamic response and the damage patterns of sandwich plate and the movement rules of the rhombic fragment are acquired. The ratio of energy loss and the maximum resultant acceleration of the rhombic fragment are compared with that of the spherical respectively.

Abstract: This paper use a welding simulation plate to simulate the hydrogen reactor overheat process, and measure it’s mechanics properties, CTOD, da/dN. contrasting SA387 or 15CrMo character under normal temperature , hydrogen reactor material and safety condition may be identified.

Abstract: Microstructures and properties of plasma surfaced Ni25 and Fe304 layers prepared on nodular cast iron substrate were investigated. The study showed that the interface boundary existed between the layers and substrate. Compared with typical microstructures of welded joint, the similar columnar grains in the layers perpendicular to the interface line were observed, which were hardly seen in the plasma sprayed coating. The conclusion could be drawn that the bonding between the Ni25 and Fe304 layers and nodular cast iron substrate belonged to the metallurgical cohesion. The XRD analysis showed that the metal compounds such as Ni₄B₃，Cr₇BC₄，γ-(Fe, Ni) and Cr₇C₃ were found in the layers. The study demonstrated that the layers had proper strength and hardness to repair the surface defects of the nodular cast iron.

Abstract: MgCuZn ferrite/CaTiO₃ and MgCuZn ferrite/BaTiO₃ composites which can be applied in low temperature co-fired ceramic (LTCC) technology were synthesized by conventional solid-state reaction at 950°C. The sintering behavior and microstructures of the samples have been analyzed. The complex permeability spectra of the above two composites have been investigated. The contribution of spin rotation and domain wall motion to the permeability spectra was estimated by the numerical fitting of measured data to the relevant formula. Influence of two types of magnetizing processes on the permeability of different composites has been analyzed combining with the variation of microstructures.

Abstract: Through the finite element method, the elastic modulus and Poisson ratio out of plane of the honeycomb nanoporous materials are obtained. In the end, the values are contrasted with the scale values. Results show that the values are same to the scale values.

Abstract: Traditional methods for crack distress detection cannot capture the geometric information of images and tend to amplify noise. In order to solve this problem, an improved algorithm based on contourlet transform and multi-direction morphological structuring elements is proposed. The new algorithm decomposed image into approximation coefficients and detail coefficients. Morphological erode operations is used to distinguish noise form detail information according to dependencies of contourlet coefficients, then nonlinear mapping function is used to modify the contourlet coefficients. And the enhanced image is obtained by contourlet inverse transform. Compared with other traditional methods, the experimental results indicate that our method can effectively extract the edges of cracks and evidently decrease the influence of noises. Moreover, it can provide good image processing speed.

Abstract: APMP high-consistency refining process is a complex energy-consuming process, under the unchanged condition of equipments, it’s very important to optimize the refining quality, yields and costs. Through analyzing the refining process, the mathematical model about optimizing three parameters simultaneously is proposed, and solved by the mathematical software with powerful function(LINGO), By comparing, the results show: for one thing, the different indices tendency determine the optimized degree; for another, the indices of quality and yields after optimization has been raised more than that before optimization, and the costs reduce obviously, the improvement of economic benefits is considerable for a larger enterprise.

Abstract: Conductive ink, especially the nano-silver ink is becoming more and more popular in printable electronic field. In order to synthesize high concentration, stable nano-silver colloid, liquid chemical reduction is used and different ratios of PVP to silver nitrate are studied. After precise adjustments of the parameters, colloid with silver content of wt7.8% is obtained. Particle size distribution, UV-Vis spectra, thermo gravimetric analysis and SEM images are conducted to characterize the silver particles. The results show that when molar ratio of PVP to silver nitrate is 0.6, the average particle size is 170nm and some deposit can be seen, while the ratio increases to 1.5, the size decreases to 68nm, and the residue quality of the silver colloid showed in the TG analysis is 7.88%. After aging for 1 month, the colloid is still stable and the color keeps to the original dark green. When the ratio continues increasing to 2.5, particle size becomes 112nm and some larger particles beyond 3μm can be observed.