Advanced Materials Research Vols. 217-218

Abstract: this subject is to use recycled glass and recycled aluminum to prepare glass / aluminum matrix composites with stirring casting technique, and stirring tank is self-researched and developed. When determining stirring tank structure, it adopts Fluent to simulate the flow field for the factors (distance from upper paddles to liquid level, stirring paddle arranging angle and paddle interval) influencing internal structure, make the optimization research on the influence of these three factors to stirring effect, compare with the actual experiment results, and propose the resolutions to improve equipment structure.

Abstract: E-44 epoxy resin was used as matrix，and silicon nitride，boron nitride，alumina and silicon carbide were used as heat-conducting insulating fillers. By selecting the amounts and types of the insulting fillers, the heat conductive properties of E-44 could be adjusted. In addition, by choosing the curing agent and accelerator the viscosity of E-44 could also be readily controlled. The relation among the adhesive viscosity，heat conductive property and prescription was studied. When the amounts of silicon nitride, alumina and boron nitride were 25%, 25%, 10% (based on the mass of epoxy resin matrix), respectively, the thermal conductivity of this system was 2.66 W/mK.

Abstract: Nowadays few current studies on blast effects are executed with real bridge structures for economic and social reasons. This paper analyzes the blast loadings on concrete bridges and offers five characteristics: uncertainty, significant structural response, mechanic differences, rapid overpressure decay, and confinement effects. Then with the further study for blast loads fundamentals and real bridge inspection, the damage forms for concrete bridges under blast loadings have been obtained, i.e. localized damage are the main structural damages and fragmentation loads can be neglected when explosions detonated above deck. Furthermore, due to the collapse or fallen of the structural components or segments secondary damages, like collisions and restraining blocks destruction, must be kept an eye on.

Abstract: VANET is a special case of MANET , and will play an increasingly important role in road traffic management. VANET networks have different motion characters in different scenarios. Through the extension of the current network simulation software NS2, the different simulation scenarios were set up. Several typical Ad hoc routing protocols were simulated and analyzed in the streets and highways scenarios. Simulation results show that AODV and DSR have a relatively stable performance. The results have value in the research and application of VANET to traffic management.

Abstract: The present work has investigated the influence of calcium on the microstructure and properties of AISI M2 high speed steels. The results show that the as-cast structure consists of the iron matrix and networks of M2C eutectic carbides, which are greatly refined in the ingot modified by calcium. Meanwhile, the morphology of M2C evolves from the plate-like shape into the fibrous one. Compared with the plate-like M2C, the fibrous M2C is less stable at high temperatures, which promotes the spheroidization and refinement of carbides. Therefore, M2 steels modified by calcium obtain higher hardness and red-hardness after heat treatment than those without the addition of calcium.

Abstract: The present work has investigated the effect of aluminum on the solidification microstructure of M2 high speed steel. The results show that the as-cast structure is refined and the networks of M2C eutectic carbides are distributed more homogeneously with the addition of aluminum. Meanwhile, the morphology of M2C changes from the fibrous shape to the plate-like one. Despite of the same crystal structure, the microstructure differs greatly between the two carbides. Compared with the fibrous M2C, micro-twining is formed in the plate-like M2C, resulting in the orientation changes between different plates. It is expected that the solid/liquid interface structure of M2C may evolve from the non-faceted into the faceted due to the addition of aluminum.

Abstract: This paper began with the theory of laser-distance measurement and the composition of the flatness detection system, and mainly analyzed the error of the flatness measurement system of hot rolling strip caused by the installation and studied the maximum thickness which could be allowed to measure in order to ensure the measurement precision

Abstract: The district collaborative design is an advanced design organization mode. The problem of definition and expression of correlation in collaborative design is aimed. The organization characteristics are analyzed based on district collaborative design space. The connection relationship acyclic graph which includes connection semantics is achieved and the relationship specialty and connection mode are explained. The algorithm is proposed to solve correlation for district collaborative design by use of correlation information model, and the correlation management model based on PDM is illustrated. Finally, a case study is conducted to prove these theory and method.

Abstract: Research information is an important work in research management of college, and involves abundant information in content and range. This article describes the overall design framework, design ideas as well as function modules of a Research Management Information System. The system not only greatly reduce the workload and improve efficiency of research management, but also would provide a large number of detailed historical data in management decisions.

Abstract: In order to exist and develop in an unpredictable and rapidly changing surroundings, it is necessary for enterprise to have an agile information systems to support its success. An agile information system is the one can reconstruct itself and adapt quickly to it’s environments. The article will begin with the focus on one more properties of information system agility, explain its definition, build its evaluating indicator system, provide the hierarchical evaluation model of information system agility, and describe the evaluation process and mathematical method. Finally, by using an example, the practicability and validity of the evaluation model is proved, comprehensive and scientific evaluation of information system agility is achieved.