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Search Results: 1 - 10 of 164285 matches for " WANG Xiao-Hu "
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Bearings-only passive tracking for maneuvering target

WANG Xiao-hu,

控制理论与应用 , 2002,
Abstract: Classical bearing-only passive target tracking method usually assumes that targets move with constant velocity in straight trajectory and relative range and velocity between target and observer are adopted as state variables. Therefore, the corresponding tracking filter can not track maneuvering target.A pseudo-linear adaptive tracking algorithm for maneuvering target is developed through manipulation of measurement equation. The algorithm is used in single-sensor and multi-sensor tracking context. Simulation results show the validity of the presented algorithm. Compared with single-sensor tracking, multi-sensor tracking is of higher accuracy, stability and convergence rate.
Fast computation of observed cross section for $ψ^{\prime} \to PP$ decays
Wang Bo-Qun,Mo Xiao-Hu,Wang Ping,Ban Yong
Physics , 2010, DOI: 10.1088/1674-1137/35/5/001
Abstract: It has been conjectured that the relative phase between strong and electromagnetic amplitudes is universally $-90^{\circ}$ in charmonium decays. $\psi^{\prime}$ decaying into pseudoscalar pair provides a possibility to test this conjecture. However, the experimentally observed cross section for such a process is depicted by the two-fold integral which takes into account the initial state radiative (ISR) correction and energy spread effect. Using the generalized linear regression approach, a complex energy-dependent factor is approximated by a linear function of energy. Taking advantage of this simplification, the integration of ISR correction can be performed and an analytical expression with accuracy at the level of 1% is obtained. Then, the original two-fold integral is simplified into a one-fold integral, which reduces the total computing time by two orders of magnitude. Such a simplified expression for the observed cross section usually plays an indispensable role in the optimization of scan data taking, the determination of systematic uncertainty, and the analysis of data correlation.
A Data-Aided Symbol Synchronization Algorithm for OFDM Systems

Gao Yan,Wang Yan,You Xiao-hu,

电子与信息学报 , 2008,
Abstract: An improved symbol synchronization algorithm for OFDM systems is proposed in this paper. Based on the assemble correlation method which estimates the available sampling window for FFT, the recovered binary serial is modulated for the second time. By computing the correlation of received signal and the twice modulated signal, the correct symbol timing is obtained. This data-aided method increases the SNR during the estimation. Simulation results demonstrate that the proposed algorithm has good timing synchronization performance over multi-path fading channel.
The influence of the Dresselhaus spin--orbit coupling on the tunnelling magnetoresistance in ferromagnet/ insulator /semiconductor/ insulator /ferromagnet tunnel junctions

Wang Xiao-Hu,An Xing-Tao,Liu Jian-Jun,

中国物理 B , 2009,
Abstract: This paper investigates the effect of Dresselhaus spin--orbit coupling on the spin-transport properties of ferromagnet/insulator/semiconductor/insulator/ferromagnet double-barrier structures. The influence of the thickness of the insulator between the ferromagnet and the semiconductor on the polarization is also considered. The obtained results indicate that (i) the polarization can be enhanced by reducing the insulator layers at zero temperature, and (ii) the tunnelling magnetoresistance inversion can be illustrated by the influence of the Dresselhaus spin--orbit coupling effect in the double-barrier structure. Due to the Dresselhaus spin--orbit coupling effect, the tunnelling magnetoresistance inversion occurs when the energy of a localized state in the barrier matches the Fermi energy EF of the ferromagnetic electrodes.
Phase synchronization on small-world networkswith communitystructure

Wang Xiao-Hu,Jiao Li-Cheng,Wu Jian-She,

中国物理 B , 2010,
Designing for a new adaptive autopilot of maneuvering entry vehicles

WANG Xiao-hu,

控制理论与应用 , 2002,
Abstract: The control of attitude and acceleration for maneuvering entry vehicles is obtained in the case that the aerodynamic parameters changing in the large-range and the pneumatic coupling is very strong, in which the control of attitude and acceleration is rather difficult. In order to improve the adaptation property of the system by using the available information, a new design method for vehicle autopilot is presented on the basis of both the pole-assignment adaptive control with parameter identification of the state equation and feed-forward in the roll-channel and the changing parameter control with attack angle feedback in the lateral-channel. The simulation shows that the proposed design method provides a good flight performance for maneuvering entry vehicles.
Research of QoS-driven dynamic web services pricing model
QoS驱动的Web services动态计价机制研究

WU Jian-bin,WANG Xiao-hu,

计算机应用 , 2008,
Abstract: Considering quality of service and user experience, a QoS-driven dynamic Web Services pricing model was proposed in the paper, which made services price vary dynamicly with several factors. And then its pricing process and corresponding algorithms were given. Experiments on its simple implementation show that the Web Services pricing model is more reasonable and precise.
Data taking strategy for the phase study in $ψ^{\prime} \to K^+K^-$
Wang Bo-Qun,Mo Xiao-Hu,Yuan Chang-Zheng,Ban Yong
Physics , 2012, DOI: 10.1142/S0217751X12501503
Abstract: The study of the relative phase between strong and electromagnetic amplitudes is of great importance for understanding the dynamics of charmonium decays. The information of the phase can be obtained model-independently by fitting the scan data of some special decay channels, one of which is $\psi^{\prime} \to K^{+}K^{-}$. To find out the optimal data taking strategy for a scan experiment in the measurement of the phase in $\psi^{\prime} \to K^{+} K^{-}$, the minimization process is analyzed from a theoretical point of view. The result indicates that for one parameter fit, only one data taking point in the vicinity of a resonance peak is sufficient to acquire the optimal precision. Numerical results are obtained by fitting simulated scan data. Besides the results related to the relative phase between strong and electromagnetic amplitudes, the method is extended to analyze the fits of other resonant parameters, such as the mass and the total decay width of $\psi^{\prime}$.
Cytotoxicity Assessment of Melamine Using the Ciliated Protozoan Tetrahymena pyriformis
WANG Zheng-fang,QI Xiao-hu,ZOU Ming-qiang,ZHANG Zhuo-yong,XU Fang
生态毒理学报 , 2009,
Abstract: 三聚氰胺曾被用为牛类的非蛋白类氮源,并被非法掺入食品中从而提高其表观蛋白含量. 实验利用一种单细胞真核生物模型——纤毛类原生动物梨形四膜虫(Tetrahymena pyriformis)研究了三聚氰胺的细胞毒性. 结果显示,三聚氰胺对梨形四膜虫的生长速率具有抑制作用,并且这种抑制作用与三聚氰胺浓度成正相关性,其IC50值为0.78g·L-1. 细胞同时发生形变. 实验证明梨形四膜虫生物测定法相对于动物实验具有耗时短、成本低、操作简便的优势,在潜在毒性物质的风险性评估实验中可成为一种优良的替代模型.
The research on the mineral characteristics of sediment and the responce to the hydrodynamic conditions of the tidal flat, at the northern Yellow River Delta

WANG Xiao-hu,LIU Hong-jun,JIA Yong-gang,

海洋科学 , 2008,
Abstract: The road paved across the tidal flat is perpendicular to the propagating direction of waves in the Yellow River Delta,which makes a sharp difference on the hydrodynamic condition of both sides of the road.We selected two representative research regions on both sides and took some sediment samples respectively.The X-ray diffraction phase analysis shows the characteristics of the mineral components and their contents which respond to the hydrodynamic conditions.In general,the content of detrital minerals increases in intense hydrodynamic condition.It is manifested more prominently in the superficial layer of the sediment.
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