Advanced Materials Research Vol. 496

Abstract: In this study, a series of sulfonic-functionalized mesoporous silica (SMS) were synthesized and SMS-Nafion composites membranes were fabricated. The morphology of SMS was characterized by scanning electron microscopy and BET. The physical properties of SMS and composites membranes were tested in terms of ion-exchange capacity, linear expansion, and ionic conductivity. The results showed that the morphology of SMS influenced their physical properties as well as the properties of SMS-Nafion composite membranes.

Abstract: Three-layer Absorbing Structure Composite Material Was Designed According to Impedance-matching and Attenuation Principles. in this Construction the Surface Layer Contained MnO2, the Intermediate Layer Fe(CO)5 , and the Bottom Layer Graphite. the Effects on the Wave Absorbing Properties of Varying the Absorbing Agent Content in each Layer of Three-layer Plates Were Investigated by Orthogonal Experiment. the Results Showed the Optimal Composition of Absorption Peaks Occurred with a Content of MnO2 in the Surface Layer of 30Wt%, a Content of Fe(CO)5 in the Intermediate Layer of 20Wt%, and a Content of Graphite in the Bottom Layer of 40Wt%. this Combination Produced a Peak Absorption of -29.05 Db. the Optimal Composition for Wider Bandwidth Occurred with a Content of MnO5 in the Surface of 10Wt%, a Content of Fe(CO)5 in the Intermediate Layer of 20Wt%, and a Content of Graphite in the Bottom Layer of 40Wt%. Further in-depth Study Will Research Optimization of both Factors to Gain Greater Absorption Peaks and Wider Bandwidth. the Findings of this Research Will Have Value in Engineering Applications of Functional Composite Materials.

Abstract: Micro/nano machining becomes more and more important and popular. Ultra-precision machines are the fundamentals. Aiming at design and developing an ultra-precision machine tool for micro/nano machining, the slide, one of the most important part of the machine has been analyzed by FEM. The software Abaqus has been used for the analysis. Based on the full load created by the coils and permanent magnet of the linear motors, the kinetics characteristics have been analyzed. According to the analytical results, the slide structure has been optimized to fulfill the requirements of the developed micro/nano machine tool.

Abstract: The fracture growth is one of primary causes which the refractory of ladle destroys. We have carried on the computation and the analysis to the ladle temperature field and the stress field coupling by he finite-element method. Attributes the crack state-of-art stress strain field using the J-integral, has established in the ladle refractory in the thermal load and under the molten steel load function its crack secure relations, and obtained the crack security change rule. These results have provided the support rationale to the equipment safe operation.

Abstract: In order to meet the pyrolysis and gasification of municipal sewage sludge, Chongqing typical pyrolysis of sewage sludge kinetic parameters are studied with heat balance in the atmospheric pressure conditions. The pyrolysis kinetics of Chongqing typical municipal sewage sludge is determined. We measure the gasification activation energy of sample in an ordinary furnace is for the 39.82 kJ/mol and the preexponential factor is 19.07s-1. These results will be used to the actual sludge pyrolysis gasification and sludge waste mixed gasification reactor for its designing, constructing and operating.

Abstract: TiO2 and MoS2/TiO2 coatings were prepared using a Plasma Electrolytic Oxidation (PEO) process at a unipolar pulsed-DC mode. Both coatings, mainly comprised of anatase TiO2, exhibited a low coefficient of friction, C.O.F < 0.21 for the TiO2 coating and C.O.F < 0.16 for the MoS2/TiO2 coating, while the MoS2/TiO2 coating had a longer wear life than TiO2-coated and uncoated Ti alloy (Ti-6Al-4V). This result showed that the solid lubricant MoS2 may play a significant role in the tribological behavior and it can be applied to many high load-bearing systems in aerospace and automotive industries.

Abstract: Safety regulation is an important approach to secure the constructing process. A three-player regulation evolutionary game model is built, the stability analysis and simulation results show that evolutionary equilibrium (EE) does not exist, providing a convenient way for regulation policy making.

Abstract: Abstract:Aiming at the nonlinear observation problem of target motion model in Cartesian coordinates, a novel target motion model in polar coordinates is proposed based on dynamic systems with analysis of scientific data materials. This paper has done about the target motion model in polar coordinates corresponding to CV model and CA respectively and simulated with Monte Carlo. The experimental results indicate that the target motion model is all agreed with targets motion in fact and can be used to describe the targets motion. Simulations show that state estimation of the KF based on the target motion mode with analysis of dynamic systems is efficient.

Abstract: The flow characteristics of nitrogen in microtubes with diameters of 14.9, 10.1, 5.03 and 2.05μm are investigated experimentally under high pressure conditions. The results show that the high pressure flow characteristics of nitrogen in microtube with the diameter of 14.9μm are in accordance with the classical fluid mechanics theory. However, with the decrease of the inner diameter of microtube, gas flow shows an apparent microscale effect and the results depart from the theoretical predictions of the conventional theory, moreover the smaller the diameter, the stronger the microscale effect. Besides, the high pressure microscale effect can not be characterized by the Knudsen number, which is proposed for studying rarefaction effect at low-pressure. Because of the existence of high-pressure microscale effect, it is inappropriate to study the real gas seepage characteristic in reservoir through the flow experiment at low pressure.

Abstract: We propose a four-terminal nano device made of quantum wires with Rashba spin-orbit (SO) coupling. In each terminal there are several independent channels formed with quantum wires. The coherent transmission of electrons in such a nano system is a combined effect of quantum interference and spin precession. When defining two opposite terminals as source and drain leads, the charge and spin currents in channels of other two terminals exhibit spatial distributions which reflect the competition between spin precession and quantum interference during the tunneling of electrons. Since the four-terminal nano device is geometrically simple for the moving paths of charge and spin, our investigation may shed some light on the basic physical picture on this issue.