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Si Y.,Liaoning Petrochemical Vocational and Technology College | Wang Z.,Liaoning University of Technology | Wu X.,Liaoning University of Technology
Tezhong Zhuzao Ji Youse Hejin/Special Casting and Nonferrous Alloys | Year: 2012

In situ Mg 2Si/Al composites were modified with pure Bi. The microstructures before and after modification were observed by OM (optical microscope), and tensile properties of the composites modified were measured, and the fracture morphologies were analyzed by SEM (scanning electron microscope) before and after modification. The results show that the addition of proper amount of Bi has significant modification effect on both primary and eutectic Mg 2Si in the composites. The morphology of primary Mg 2Si is changed from dendritic to polyhedral shape, and the grain size is refined from 70 μm to 6 μm, meanwhile, the eutectic Mg 2Si is transformed from flake-like to very short fibrous or dot-like. The tensile strength of the alloy modified by 1.0% Bi is increased from 175 MPa to 260 MPa, and its e-longation is increased from 3.5% to 7.0%. Source


Chen M.,Liaoning University of Technology | Xu J.,Liaoning Petrochemical Vocational and Technology College | Xin L.,Liaoning University of Technology | Zhao Z.,Liaoning University of Technology | Wu F.,Liaoning University of Technology
Optics and Lasers in Engineering | Year: 2016

This paper describes an investigation on differences in interactions between laser and arc plasma during laser-gas tungsten arc (LT) welding and laser-gas metal arc (LM) welding. The characteristics of LT heat source and LM heat source, such as plasma behavior, heat penetration ability and spectral information were comparably studied. Based on the plasma discharge theory, the interactions during plasma discharge were modeled and analyzed. Results show that in both LT and LM welding, coupling discharge between the laser keyhole plasma and arc happens, which strongly enhance the arc. But, the enhancing effect in LT welding is much more sensitive than that in LM welding when parameters are adjusted. © 2016 Elsevier Ltd. All rights reserved. Source


Ma W.,Liaoning University of Technology | Yuan Q.,Liaoning University of Technology | Yan Y.,Liaoning Petrochemical Vocational and Technology College
ICIC Express Letters, Part B: Applications | Year: 2012

This paper designs new algorithms optimization of fuzzy control system. On the basis of multi-phase adaptive fuzzy controller, we use ant colony algorithm and genetic algorithm to optimize the fuzzy control rules and membership functions separately, in order to reduce the number of control rules and adjust membership functions constantly to adapt the variations of traffic condition. The simulation proved that this design adapts to the complex traffic environment and reduces traffic delays effectively. © 2012 ICIC International. Source


Wang Y.,Beijing University of Chemical Technology | Zhang L.,Liaoning Petrochemical Vocational and Technology College | Zhang J.,Beijing University of Chemical Technology | Li Y.,Beijing University of Chemical Technology | Huang C.,Beijing University of Chemical Technology
Beijing Huagong Daxue Xuebao (Ziran Kexueban)/Journal of Beijing University of Chemical Technology (Natural Science Edition) | Year: 2011

Thermodynamic calculations for the alkylation of benzene with 2-butylene have been carried out and analyzed in detail. The thermodynamic data for the alkylation reaction including enthalpy, Gibbs free energy, and equilibrium constant of reaction at different temperatures have been calculated. The effects of varying the temperature, molar ratio of benzene/2-butylene and an impurity (butane) on the thermodynamic equilibrium of the alkylation reaction have been studied. The results show that the reaction producing tert-butylbenzene is the preferable one at equilibrium in the reaction system. The selectivity to sec-butylbenzene at the thermodynamic equilibrium can be improved by raising the temperature and increased molar ratios of benzene/2-butylene lead to an increase in selectivity to di-butylbenzenes. It was confirmed that butane, a likely impurity in the raw materials, had no influence on the alkylation reaction. Source


Ma W.,Liaoning University of Technology | Geng D.,Liaoning University of Technology | Yan Y.,Liaoning Petrochemical Vocational and Technology College
International Journal of Innovative Computing, Information and Control | Year: 2012

Single intersection in the traffic system is a complex system which has the nonlinear and uncertain characteristics. If the traffic states in the single intersection become more complex, the traditional timing control of the traffic lights is not suitable for the traffic control. A multi-phase fuzzy controller of the single intersection is proposed in this paper, by using the integration of the multi-phase control, and incorporating genetic algorithm into fuzzy control design to optimize fuzzy membership functions. The proposed control method is suitable for the different traffic states in the different times, and can achieve satisfactory control performance. The simulation experiment is implemented to prove the effectiveness of the proposed multi-phase fuzzy controller. ©2012 ICIC International. Source

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