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Mao R.,Beijing Institute of Technology | Li J.,Beijing Institute of Technology | Cui H.,China Ship Research Development Academy | Chen Q.,Chengdu University of Information Technology
Journal of Microwave Power and Electromagnetic Energy | Year: 2015

The electromagnetic field propagation characteristics of a contactless setting of fuze are proposed. Its typical scheme that includes two coils, an insulated resin cylinder and a metal hemisphere shell, is set up. Firstly, the near field is non-uniform spherical waves. Secondly, the electric field intensity vector E is parallel to xOy plane, while the magnetic field intensity vector H exists in arbitrary direction; the vector E only has a transverse component, which is perpendicular to its propagation direction, while the vector H has both transverse and radial ones. Thirdly, the amplitude of vector E is inversely proportional to the square of distance, while the amplitude of vector H inversely proportional to the cube of distance; both vectors E and H are directional. Fourthly, when latitude angle θ is equal to 900, the amplitude of E is maximal, and it is zero as θ is equal to 00; when latitude angle θ is equal to 00, the amplitude of H is maximal, and it is minimal as θ is equal to 900. For E-plane, the beam width 2θ0 between zero power points is 1800, while the beam width 2θ0.5 between half power points is 900; for H-plane, the beam width 2θ0 does not exist; the beam width 2θ0.5 is 2arcsin[(2/3)0.5]. Fifthly, there are reflection waves on the surface of both the insulated resin cylinder and the metal hemisphere shell that produce a full reflection phenomenon; it is possible to produce full transmission phenomenon on the surface of the cylinder. An experimental example is presented for verifying these theoretical predictions. © 2014 Taylor and Francis Group LLC. Source


Du Y.,Beijing Institute of Technology | Cui H.,China Ship Research Development Academy | Li B.,Beijing Institute of Technology | Li J.,Beijing Institute of Technology
Journal of Information and Computational Science | Year: 2015

Regional coverage reconnaissance is a significant means of obtaining the important targets in the region and a prerequisite for the precision strike. The research status of LAVs (Loitering Air Vehicles) regional coverage is analyzed in his paper, and the detector model is built which is applicable to LAV. By analyzing the different ways how circular target region should be divided, a conclusion is obtained that the total distance is shortest and the total turning number is least in the parallel split manner; according to the indicators requirements of turning radius and reconnaissance radius, LAV turning method is appropriately given; the objective function of this problem is established and the constraints are determined correspondingly, then this problem had been optimized with MOPSOA (Multi-object Particle Swarm Optimization Algorithm); the obtained path plan after optimization is ideal. Copyright © 2015 Binary Information Press. Source


Yang X.-G.,China Ship Research Development Academy | Lin L.,China Ship Research Development Academy | Bai Z.-G.,China Ship Scientific Research Center | Li B.,China Ship Research Development Academy
Chuan Bo Li Xue/Journal of Ship Mechanics | Year: 2015

The Donnell equation of thin shell was applied to describe double cylindrical shells motion. The effect of the rings, annular pales and the fluid was treated as forces and moments on shells, which were presented in terms of the additional impedance. By using the mode expanding expression of shell's displacement, the sound and vibration transfer matrix between the inner and outer shell was constituted. The numerical analysis of mean square velocity of the outer shell was carried out. The result verified that the transfer matrix of the inner and outer shell was fixed, which was not influenced by excitation property. It offers the theoretical basis to predict the noise of double cylindrical shells. ©, 2015, China Ship Scientific Research Center. All right reserved. Source


Zhang Q.-W.,Beijing Institute of Technology | Bao H.,Beijing Institute of Technology | Zhao F.-Q.,Beijing Institute of Technology | Bao S.-M.,Beijing Institute of Technology | And 3 more authors.
Journal of Beijing Institute of Technology (English Edition) | Year: 2014

A novel surface plasmon resonance (SPR) sensor based on molecularly imprinted films (MIFs) was developed for the detection of pentaerythritol tetranitrate (PETN). In this work, the thin MIFs were formed on a gold sensor chip through thermal co-polymerization of functional monomers (methacrylic acid, MAA) and crosslinking monomers (ethylene glycol dimethacrylate, EGDMA) in the presence of template molecules PETN. The template molecules PETN were subsequently removed from the MIFs simply by rinsing the MIFs with a mixture of acetonitrile and acetic acid 9:1 (v/v), thus the recognition sites were formed for specific detection of PETN. According to the mass coverage equation, the surface coverage of removed PETN from MIFs was about 10.8 ng/mm2. The developed SPR sensor allowed for the detection of PETN at concentration down to 10-10 mol/L. A control experiment utilizing an analogue cyclotrimethylenetrinitramine (RDX) showed MIFs' good selectivity to PETN. © right. Source

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