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On the new results of global attractive set and positive invariant set of the Lorenz chaotic system and the applications to chaos control and synchronization

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science in China(series F) 2005年第3期48卷 304-321页

作者： LIAO Xiaoxin 1, 2, 3 , FU Yuli 4 & XIE shengli 4 1. Department of Control science & Control engineering, Huazhong university of science & technology, wuhan 430074, China 2. school of Automation, wuhan university of science & technology, wuhan 430070, China 3. school of Information, Central south university of Economy, Politics and Law, wuhan 430064, China 4. school of Electronics & Information engineering, south China university of technology, Guangzhou 510640, China Correspondence should be addressed to Liao Xiaoxin (email: xiaoxin_liao@***) 1. Department of Control science & Control engineering Huazhong University of Science & Technology 430074 Wuhan China 2. school of Automation Wuhan University of Science & Technology 430070 Wuhan China 3. school of Information Central South University of Economy Politics and Law 430064 Wuhan China 4. school of Electronics & Information engineering South China University of Technology 510640 Guangzhou China

Constructing a family of generalized Lyapunov functions, a new method is proposed to obtain new global attractive set and positive invariant set of the Lorenz chaotic system. The method we proposed greatly simplifies the complex proofs of the two famous estimations presented by the Russian scholar Leonov. Our uniform formula can derive a series of the new estimations. Employing the idea of intersection in set theory, we extract a new Leonov formula-like estimation from the family of the estimations. With our method and the new estimation, one can confirm that there are no equilibrium, periodic solutions, almost periodic motions, wandering motions or other chaotic attractors outside the global attractive set. The Lorenz butterfly-like singular attractors are located in the global attractive set only. This result is applied to the chaos control and chaos synchronization. some feedback control laws are obtained to guarantee that all the trajectories of the Lorenz systems track a periodic solution, or globally stabilize an unstable (or locally stable but not globally asymptotically stable) equilibrium. Further, some new global exponential chaos synchronization results are presented. Our new method and the new results are expected to be applied in real secure communication systems.

关键词： Lorenz chaotic system global attractive set positive invariant set globally exponential tracking globally exponential synchronization.

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Tele-Network Design Based on Queue Competition Algorithm

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wuhan university Journal of Natural {2.s 2003年第S1期8卷 327-330页

作者： Huang Zhang-can, Wan Li-jun, Tang Tao, Chen Zheng-xustate Key Laboratory of software engineering, wuhan university, wuhan 430072, Hubei, Chinaschool of Material science and engineering, wuhan university of technology , wuhan 430070, Hubei, Chinaschool of Automation, wuhan university of technology, wuhan 430070, Hubei, Chinaschool of science, wuhan university of technology, wuhan 430070, Hubei, China wuhan university State Key Laboratory of Software Engineering Wuhan Hubei China (GRID:grid.49470.3e) (ISNI:***) wuhan university of technology School of Material Science and Engineering Wuhan Hubei China (GRID:grid.162110.5) (ISNI:***) wuhan university of technology School of Automation Wuhan Hubei China (GRID:grid.162110.5) (ISNI:***) wuhan university of technology School of Science Wuhan Hubei China (GRID:grid.162110.5) (ISNI:***)

In this paper, we report research on how to design the tele-network. First of all, we defined the reliability of tele-network. According to the definition, we divide the whole reliability into two parts:the reliability of the mini-way and that of the whole system. Then we do algebra unintersection of the mini-way, deriving a function of reliability of tele-network. Also, we got a function of the cost of tele-network after analyzing the cost of arcs and points. Finally, we give a mathematical model to design a tele-network. For the algorithm, we define the distance of a network and adjacent area within certain boundaries . We present a new algorithm--Queue Competition Algorithm (QCA) based on the adjacent area . The QCA correlates sequence of fitnesses in their father-generations with hunting zone of mutation and the number of individuals generated by mutation, making the stronger fitness in a small zone converge at a local extreme value, but the weaker one takes the advantage of lots of individuals and a big zone to hunt a new local extreme value. In this way, we get the overall extreme value. Numerical simulation shows that we can get the efficient hunting and exact solution by using QCA. The QCA efficient hunting and exact solution.

关键词： reliability Queue Competition algorithm the distance of a network adjacent area

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Preparation and Absorption/Desorption Performance of Gypsum-based Humidity Controlling Materials

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Journal of wuhan university of technology(Materials science) 2011年第4期26卷 684-686页

作者：姜洪义 school of Materials science and engineering Wuhan University of Technology

Absorption/desorption properties of some humidity controlling materials which contain gypsum as basic cement materials and activated sepiolite powder as humidity controlling media were tested. The kinetics curve of moisture adsorption/desorption were drawn and humidity controlling performance in nature environment was verified. The experimental results show that moisture absorption/desorption rates are increased, and the speed is also accelerated. These materials, which can adjust environmental humidity effectively, are new ones with good humidity controlling performance.

关键词： activated sepiolite gypsum-composites humidity controlling performance

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Cure Reaction Kinetics of Low Pressure sheet Molding Compound system Thickened by Crystalline Polymer

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Journal of wuhan university of technology(Materials science) 2007年第2期22卷 380-384页

作者：秦岩 school of Materials science and engineering Wuhan University of Technology

several kinetic models for unsaturated polyester cure reaction and some existing parameter estimation techniques of these models were introduced. Correlated kinetic parameters and kinetic equations of the autocatalytic empirical kinetic model of LPsMC system were determined by using isothermal DsC to scan the system which was thickened by crystalline polymer （PEG-MAH）. Through using a serial curing degree of the system to validate the model, the experimental results were basically identical with the predictions of the autocatalytic empirical kinetic model. This model could provide a theoretical reference to the determination of molding techniques of low pressure sMC.

关键词： low pressure sMC curing kinetics model crystalline polymer

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statistical assessment of H/A target decomposition theorems in radar polarimetry

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science China(Information sciences) 2010年第2期53卷 355-366页

作者： LIU Tao 1,2 , HUANG GaoMing 1 , WANG Xuesong 2 & XIAO shunPing 2 1 school of Electronic engineering, Naval university of engineering, wuhan 430033, China 2.school of Electronic science and engineering, National university of Defense technology, Changsha 410073, China 1. school of Electronic engineering Naval University of Engineering Wuhan 430033 China2. School of Electronic Science and Engineering National University of Defense Technology Changsha 410073 China

Target decomposition (TD) theorems have been widely applied in radar polarimetry, serving as the bridge between radar measurements and the physical parameters of a scatterer. The H/A target decomposition is one of the most suitable tools for performing data interpretation in the study and characterization of natural scatters. In this paper, the statistics of the parameters of eigenvalue, eigenvector and H/A have been analyzed via a novel method, and the probability density functions (PDF) have been obtained. It is pointed out that all these parameters can be seen as asymptotically nonbiased with respect to the number of looks. In order to reduce the biases for a small number of looks, a novel estimator for the parameters has been proposed. We give the basic theorems for accurate estimation of parameters.

关键词： target decomposition theorems H/A characteristic parameters statistical analysis MLE

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Research on the Group Decision in Manufacturing Chain

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武汉理工大学学报 2006年第S3期28卷 1102-1106页

作者： WEI shuangying~1 LI Biqiang~2 (1.Management school,wuhan university of technology.wuhan 430070,China, 2.Management school,wuhan university of technology.wuhan 430070,China) Management school Wuhan University of TechnologyWuhan 430070China

The competition in 2.st century will be the competition among different manufacturing *** chain makes decision not only the core enterprise of the manufacturing chain but also a group of *** significant decision in manufacturing chain will affect each enterprise in manufacturing chain,thus every significant decision should meet the desire and requests of each enterprise that be *** significant decision should concentrate in the opinion of each member in the rep- resentative assembly or committee and obtain the authorization of the *** vital question also should be discussed,made the decision and coordinated the moves by the representative assembly or the *** society’s development and the technical progress,the knowledge and the information content is growing suddenly,the questions needs making the decision are more and complex,the single enterprise only depended on its own resources and the strength is unable to grasp all essential information,and hard to face all *** representative assembly formed by representatives from each enterprise in manufacturing chain can gather together experts of different knowledge structure and different experience,which make up the deficiency of single enterprise in resources,strength and experience with the aid of many enterprises’resources and the *** is not just increase several brains,but to establish an information complex to ensure the scientific of decision,which formed by different knowledge structure, applies scientific theory method and means,can mutually enlighten and has abundant *** it comes down to the group *** decision questions have two types,one is the collectivity decision which pursue the holistic benefit of the group,the other is that the members in the group pursue its’own benefit and value against others,that means the game theory of interest con- flict existed among the ***,most scholars research the q

关键词： manufacturing chain group decision GDss

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Photocatalytic Degradation of Metronidazole in Aqueous solution by Niobate K_6Nb_(10.8)O_(30)

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wuhan university Journal of Natural {2.s 2010年第4期15卷 345-349页

作者： WANG Huiyan1, ZHANG Gaoke2, GAO Yuanyuan2 1. Hospital, wuhan university of technology, wuhan 430070, Hubei, China 2. school of Resources and Environmental engineering, wuhan university of technology, wuhan 430070, Hubei, China Hospital Wuhan University of Technology Wuhan Hubei China school of Resources and Environmental engineering Wuhan University of Technology Wuhan Hubei China

The photocatalytic degradation of antibiotic metroni-dazole in aqueous solution by niobate K6Nb10.8O30 photocatalyst that was prepared using a soft-chemical method was studied by Fourier transform infrared spectroscopy and UV-Vis absorption spectrum. Metronidazole is very stable and is difficult to degrade under UV irradiation. K6Nb10.8O30 photocatalyst cannot degrade metronidazole without UV irradiation and shows very high photo-catalytic activity for the degradation of metronidazole under UV irradiation. The photocatalytic degradation rate of metronidazole increased with increasing the dosage of K6Nb10.8O30 photocatalyst. The photocatalytic degradation reaction of metronidazole by nio-bate K6Nb10.8O30 follows the first-order kinetic equation.

关键词： niobate potassium niobate metronidazole photo- catalytic kinetics

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Toughening Modification of Unsaturated Polyester Resin Using HDI Trimer

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Journal of wuhan university of technology(Materials science) 2009年第4期24卷 627-630页

作者：段华军 school of Materials science and engineering Wuhan University of Technology

HDI trimer was firstly used to improve the mechanical properties of hydroxyl-terminated unsaturated polyester （UP）. Mechanical properties measurements performed on the cured materials demonstrate a distinct improvement in intensity and toughness in the presence of HDI trimer and shows the change trends of increase and then decrease. The morphological analysis of the fracture surfaces shows that the micro-phase separated structures appear in modified UPR systems and changed from dendritric, dimple and to cystiform structures with the increase of HDI trimer content. The presence of the cystiform structures made the modified UPR systems present the best properties.

关键词： HDI trimer unsaturated polyester toughness mechanical properties morphology

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FLOW PATTERNs AND FORCE CHARACTERIsTICs OF LAMINAR FLOW PAsT FOUR CYLINDERs IN DIAMOND ARRANGEMENT

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Journal of Hydrodynamics 2011年第1期23卷 55-64页

作者： ZOU Lin LIN Yu-feng LU Hong school of Mechanical and Electronic engineering Wuhan University of Technology Wuhan 430070 China Department of Mechanical engineering The Hong Kong Polytechnic University Hong Kong China

A three-dimensional numerical investigation of cross-flow past four circular cylinders in a diamond arrangement at Reynolds number of 200 is carried *** the spacing ratios（L /D）ranging from 1.2 to 5.0,the flow patterns can be classified into three basic *** critical spacing ratio for the transition from narrow gap flow pattern to vortex impingement flow pattern around the cylinders is found to beL /D=3.0,while a single bluff-body flow pattern is observed atL /D=*** relationship between the three-dimensional flow patterns and force characteristics around the four cylinders shows that the variation of forces and strouhal numbers againstL /D are generally governed by these three kinds of flow *** is concluded that the spacing ratio has important effects on the development of the free shear layers about the cylinders and hence has significant effects on the force and pressure characteristics of the four cylinders with different spacing ratios.

关键词： four cylinders spacing ratio flow pattern force characteristics

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Nonstationary clutter suppression for airborne conformal array radar

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science China(Information sciences) 2011年第10期54卷 2170-2177页

作者： DUAN KeQing 1,2,XIE WenChong 2 & WANG YongLiang 2 1 school of Electronic science and engineering,National university of Defense technology,Changsha 410073,China 2 Key Research Lab,wuhan Radar Academy,wuhan 430019,China 1. school of Electronic science and engineering National University of Defense Technology Changsha 410073 China2. Key Research Lab Wuhan Radar Academy Wuhan 430019 China

The essence of nonstationary clutter for airborne radar with conformal antennas array (CAA) is analyzed,and an angle-Doppler compensation method for clutter suppression is *** with the uniform linear antennas array (LAA),the clutter angle-Doppler spectrum distribution of CAA should be described in four-dimension space,i.e.,three-dimension space and time,because the elements of CAA are distributed in three-dimension *** to this theory,the clutter nonstationarity for airborne radar with CAA is firstly analyzed and the nonstationary nature of it is *** an improved sTAP method for airborne radar with CAA is proposed,and it compensates for the mainlobe clutter in four-dimension frequency ***,the simulation results show the effect of the novel method.

关键词： conformal antennas array (CAA) space-time adaptive processing (sTAP) nonstationarity clutter suppression

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