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Search Results: 1 - 10 of 33110 matches for " HOU Zhong-xi "
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Speech recognition based on improved MP sparse decomposition algorithm

GAO Xian-zhong,HOU Zhong-xi,

计算机应用 , 2009,
Abstract: Based on the limit of input glossaries and the characters of atoms structure in Matching Pursuit (MP) sparse decomposition, a new speech recognition algorithm was proposed through using the best obtained atoms' time-frequency parameters as matching parameters among test signals and swatch signals. In order to enhance the computing efficiency of MP sparse decomposition, the strategy based on dictionary partitioning and Genetic Algorithm (GA) was applied. In Matlab, the LGB algorithm was used to distinguish test signals. The simulation results show that the speech signal with length 6000 can efficiently be recognized through using ten atoms' time-frequency parameters, while the running speed of improved MP sparse decomposition algorithm is enhanced.
Quaternion-based Kalman filter and its performance analysis in integrated navigation

GAO Xian-zhong,HOU Zhong-xi,WANG Bo,ZHANG Jun-tao,

控制理论与应用 , 2013,
Abstract: In order to take a systematic analysis for quaternion Kalman filter (QKF) performance in integrated navigation system for estimating attitude of aircraft, measurement equation, process equation and covariance computation model of QKF are established. A simulation sample about gyro/accelerator/magnetometer integrated navigation system and an experiment about gyro/accelerator initial alignment are developed. Performance of computation load, convergence, convergent rate and estimation precision are compared between QKF and extended Kalman filter (EKF). The results indicate that QKF is easier to be implemented and achieve convergence than EKF, QKF estimation precision is higher than that of EKF about two orders of magnitude; but there is a time interval in which QKF estimation precision is lower than that of EKF.
Improved multi-objective genetic algorithm based on NSGA-II

CHEN Xiao-qing,HOU Zhong-xi,GUO Liang-min,LUO Wen-cai,

计算机应用 , 2006,
Abstract: Based on the study and analysis of NSGA-II algorithm, a new initial screening mechanism was designed, coefficient generating of crossover arithmetic operator was improved and more reasonable crowding mechanism was proposed. In this way, convergence was speeded up and its precision was improved. The testing results by representative applied functions show that with the improvements higher computational efficiency and more reasonable distributed solution can be obtained, and diversified distribution of the solutions can be maintained.
A Comprehensive Evaluation of Geoheritages in Guide National Geopark of Qinghai Province

XIAO Jing-yi,HOU Guang-liang,TANG Zhong-xi,ZHANG Yu-zhen,ZHU Jia-jia,

地球学报 , 2013,
Abstract: 地质遗迹综合评价是保护和利用地质遗迹的重要科学依据。本文在系统阐述青海省贵德国家地质公园地质遗迹类型与特征的基础上,依据国土资源部《中国国家地质公园建设技术要求和工作指南》地质遗迹(景观)评价系统和改进后的菲什拜因-罗森伯格模型,对贵德国家地质公园地质遗迹进行综合评价研究。结果表明:公园地质遗迹丰富多样、形态典型、景观奇特、保存良好;地质遗迹可分为8个大类,16个亚类;地质遗迹具有较高的科学价值、科普价值、美学价值、康体价值以及旅游开发价值,其中尤以水体景观、峰丛地貌和黄河奇石最为典型,属于国家级资源。研究结果不仅为地质遗迹的评价提供了一种新的模式,而且对于正确认识贵德国家地质公园地质遗迹状况,深入进行地质遗迹保护、开发利用和管理等工作具有一定的参考价值。
Surface stoichiometry of zinc sulfide and its effect on the adsorption behaviors of xanthate
Meng Wang, Qi Zhang, Wei Hao, Zhong-Xi Sun
Chemistry Central Journal , 2011, DOI: 10.1186/1752-153x-5-73
Abstract: Zinc sulfide is one of the most important industrial minerals of zinc metal, which is usually recovered by flotation technology, in which the mineral surfaces are treated hydrophobic. Synthetic zinc sulfide is also well known as electroluminescence material. In fact, due to its wide applications and potential use as a spintronic material in high technology field, it was one of the most studied luminescence [1-10], photo catalyst [11], special morphology [11-16] and mesoporous materials [17-21] in inorganic synthesis. It was reported that transition metal doped nanocrystals of semiconductor like zinc sulfide can yield both high luminescence efficiencies and life time shortening [1]. The doped semiconductor nanocrystals seem to represent a new class of luminescent material, with wide range application in e.g. display, lighting and lasers [2-10]. In past years the dramatic surface effect of nano sized ZnS was reported [22], which states that when the surface of a ZnS nanoparticle gets wet, its entire crystal structure rearranges to become more ordered, closer to the structure of a bulk piece of solid ZnS. It was also reported [23] that zinc sulfide nanoparticles, a mere 10 atoms across have a disordered crystal structure that puts them under constant strain, increasing the stiffness of the particles. Obviously surface chemical property of zinc sulfide plays a critical role in these phenomena. When zinc sulfide are put into aqueous solution, the surface hydration takes place at once, the adsorption of proton and hydroxide ions make the surface either positively or negatively charged in the absence of foreign ions. Due to the sensitivity of sulfide ions to oxygen, redox reactions at the surfaces may take place as well. The surface properties are influenced by overall equilibrium of surface and solution chemical reactions including solution acid base and redox reactions, surface complexations, precipitation and dissolution. All theses reactions are very fundamental to und
Heterodyne and adaptive phase measurements on states of fixed mean photon number
D. W. Berry,H. M. Wiseman,Zhong-Xi Zhang
Physics , 1998, DOI: 10.1103/PhysRevA.60.2458
Abstract: The standard technique for measuring the phase of a single mode field is heterodyne detection. Such a measurement may have an uncertainty far above the intrinsic quantum phase uncertainty of the state. Recently it has been shown [H. M. Wiseman and R. B. Killip, Phys. Rev. A 57, 2169 (1998)] that an adaptive technique introduces far less excess noise. Here we quantify this difference by an exact numerical calculation of the minimum measured phase variance for the various schemes, optimized over states with a fixed mean photon number. We also analytically derive the asymptotics for these variances. For the case of heterodyne detection our results disagree with the power law claimed by D'Ariano and Paris [Phys. Rev. A 49, 3022 (1994)].
Sorption of phosphate onto mesoporous γ-alumina studied with in-situ ATR-FTIR spectroscopy
Ting-Ting Zheng, Zhong-Xi Sun, Xiao-Fang Yang, Allan Holmgren
Chemistry Central Journal , 2012, DOI: 10.1186/1752-153x-6-26
Abstract: In situ ATR-FTIR spectroscopy was used to identify phosphate complexes adsorbed within the three-dimensional network of mesoporous γ-alumina at pH 4.1 and 9.0. The integrated intensity between 850 cm-1 and 1250 cm-1 was used as a relative measure of the amount of adsorbed phosphate. The integrated intensity proved to be about 3 times higher at pH 4.1 as compared with the corresponding intensity at pH 9.0. The adsorption of phosphate at the two pH conditions could be well described by the Langmuir adsorption isotherm at low concentrations and the empirical Freundlich adsorption isotherm for the whole concentration range, viz. 5 – 2000 μM.From the band shape of infrared spectra at pH 4.1 and pH 9.0, it was proposed that the symmetry of the inner-sphere surface complex formed between phosphate and γ-alumina was C1 at the lower pH value, whilst the higher value (9.0) implied a surface complex with C2v or C1 symmetry. The difference in adsorbed amount of phosphate at the two pH values was ascribed to the reduced fraction of?≡?AlOH2+ surface sites and the increased fraction of?≡?AlO- sites upon increasing pH from 4 to 9.The concern about phosphate distribution in fresh water and soil is motivated by its detrimental contribution to eutrophication in lakes and rivers and the extensive use of phosphates in industry, agriculture and households [1,2]. The mobility of phosphate in soil and aquatic systems is largely determined by the reaction between phosphate and mineral surfaces [3,4]. Because of the abundance of aluminum and iron oxides in soil and sediment and their sorption reactivity to phosphate, the interaction of water with alumina and iron oxide [5-10] and the uptake of phosphate on various Al- and Fe-oxides (e.g., boehmite, gibbsite, goethite, ferrihydrite, hematite) has been studied extensively in the past decades by both macroscopic and spectroscopic methods [11-28,30]. These investigations showed that phosphate inner-sphere complexes were formed at the metal oxide
Soliton dynamics of magnetization driven by a magnetic field in uniaxial anisotropic ferromagnet
Zheng, Zhong-Xi;Li, Qiu-Yan;Li, Zai-Dong;Wen, Ting-Dun;
Brazilian Journal of Physics , 2006, DOI: 10.1590/S0103-97332006000700031
Abstract: we study the nonlinear magnetic excitation in an anisotropic ferromagnet with a magnetic field. in the long wave approximation, the landau-lifschitz equation with easy axis anisotropy is transformed into the nonlinear schr?dinger type. by means of a straightforward darboux transformation we obtain the one- and two-soliton solutions of uniaxial anisotropic ferromagnet. from a careful analysis for the asymptotic behavior of two-soliton solution we find that the collision between two magnetic solitons is elastic. this will be very helpful to understand the significant nature of the interactions between solitons in the future.
Hurst's Exponent Determination for Radial Distribution Functions of In, Sn and In-40 wt%Sn Melt

ZHOU Yong-Zhi,LI Mei,GENG Hao-Ran,YANG Zhong-Xi,SUN Chun-Jing,

中国物理快报 , 2011,
Hirota method for the nonlinear Schr?dinger equation with an arbitrary linear time-dependent potential
Zai-Dong Li,Qiu-Yan Li,Xing-Hua Hu,Zhong-Xi Zheng,Yu-Bao Sun
Physics , 2010, DOI: 10.1016/j.aop.2006.11.012
Abstract: In this paper, a Hirota method is developed for applying to the nonlinear Schr\"odinger equation with arbitrary time-dependent linear potential which denotes the dynamics of soliton solutions in quasi-one-dimensional Bose-Einstein condensation. The nonlinear Schr\"odinger equation is decoupled to two equations carefully. With a reasonable assumption the one- and two-soliton solutions are constructed analytically in the presence of an arbitrary time-dependent linear potential.
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