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Liu Z.-Z.,Northwestern Polytechnical University | Liu Z.-Z.,Xian Aeronautical University | Wang F.-B.,Northwestern Polytechnical University
Guangxue Jingmi Gongcheng/Optics and Precision Engineering | Year: 2014

The application of Compressed Sensing (CS) theory to multiple target localization in Wireless Sensor Networks (WSNs) was explored. A CS reconstruction method based on Discrete Glowworm Swarm Optimization (DGSO) algorithm was proposed and the algorithm processing was designed. Different from the traditional reconstruction method, the DGSO algorithm is independent on the sparse K and can accurately reconstruct the original signal. The improved CS was applied to the multiple target localization in WSNs, and the WSNs application model was established. Then, a reasonable measuring matrix and a sparse matrix were constructed, and the relationship between measuring matrix and reconstructed results was analyzed. Finally, the multiple target localization was achieved in WSNs. The simulation results show that this method has better effect in the sparse signal reconstruction and multi target locating precision, and its location precision is better than those of Greedy Matching Pursuit (GMP), Orthogonal Matching Pursuit(OMP) and mum Likelihood Estimation (MLE). Moreover, it reduces the network communication data amounts, extends the lifetime of WSNs. The number of sensor nodes for localization of WSNs is reduced by 20%, and the anti-noise can reach to 20 dB. Source

Yue T.M.,Hong Kong Polytechnic University | Xie H.,Hong Kong Polytechnic University | Xie H.,Xian Aeronautical University | Lin X.,Northwestern Polytechnical University | And 2 more authors.
Entropy | Year: 2013

An AlCoCrCuFeNi high-entropy alloy (HEA) coating was fabricated on a pure magnesium substrate using a two-step method, involving plasma spray processing and laser re-melting. After laser re-melting, the microporosity present in the as-sprayed coating was eliminated, and a dense surface layer was obtained. The microstructure of the laser-remelted layer exhibits an epitaxial growth of columnar dendrites, which originate from the crystals of the spray coating. The presence of a continuous epitaxial growth of columnar HEA dendrites in the laser re-melted layer was analyzed based on the critical stability condition of a planar interface. The solidification of a columnar dendrite structure of the HEA alloy in the laser-remelted layer was analyzed based on the Kurz-Giovanola-Trivedi model and Hunt's criterion, with modifications for a multi-component alloy. © 2013 by the authors. Source

Wei Z.,Xian Aeronautical University
International Journal of Simulation: Systems, Science and Technology | Year: 2015

This article studies on the safety assistant decision system of boiler in thermal power plant based on B/S architecture. The boiler safety is much more challenged by its super large-capacity, high-parameter and high-performance heat-resistant materials. Meantime, this paper suggested that boiler safety technical research should conducted on a comprehensive experimental platform, by an optimizing work team, along a new direction of combining technology of gas-solid two-phase flow and combustion, gas-liquid two-phase flow and heat transfer as well as metal material. Further, safety research would promote the development of scientific administration and management. So, researching on the safety assistant decision system of boiler in thermal power plant based on B/S architecture has important significance to the development of boiler industry. © 2015, UK Simulation Society. All rights reserved. Source

Wang C.,Xian Aeronautical University
Guti Dianzixue Yanjiu Yu Jinzhan/Research and Progress of Solid State Electronics | Year: 2015

The charging characteristics of the dielectric sample under electron beam irradiation were studied by applying the numerical model incorporating electron scattering, transport, trapping process and self-consistent field. The electron yield was measured with an experimental platform. Results show that, the space charge is distributed positively within the scattering region, but negatively outside the region due to electron drift and diffusion. With irradiation, the surface potential decreases to a stable value, and the electron total yield increases and approaches to unity, and therefore the transient process tends to equilibrium. The surface potential decreases with the increase of the electron beam energy, and decreases weakly with the increase of the beam current. For the sample with the irregular surface, the surface potential increases with the increase of the tilt angle. ©, 2015, NUAA Printing House. All right reserved. Source

Liu D.,Xian Aeronautical University
2012 IEEE International Conference on Mechatronics and Automation, ICMA 2012 | Year: 2012

In order to construct the members of the supply chain, make the same status in the superior position of priority degree, this paper use fuzzy syntheses to evaluate the members of Supply Chain; then, based on polychromatic sets theory, can descript the collaboration partnerships strength of supply chain network formally, and avoiding the pseudo fuzzy evaluation of optimal solutions; the supply chain by building cooperation between the members of the combination mathematical model to determine the genetic algorithm fitness function, to improve supply chain network construction global stability; Finally, using this improved genetic algorithm on whole supply chain network optimization. © 2012 IEEE. Source

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