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Science china(Technological Sciences) 2010年第5期53卷 1234-1239页

作者： LI ChenSha1,2.QIAO YingJie1,WU JianJun2.WANG DaZhi2.& YUAN DianBo2.1 department of Materials Science,harbin {2. University,harbin 150001,china 2.department of Mechanical {2.,Tsinghua University,Beijing 100084,china 1. department of Materials Science Harbin Engineering University Harbin 150001 China2. Department of Mechanical Engineering Tsinghua University Beijing 100084 China

Polarizable electrodes of electric double layer capacitors(EDLCs) were made from carbon nanotubes(CNTs).Effect of carbon dioxide activation together with acid oxidation for the electrodes on the characteristics and performances of electrodes and EDLCs was *** dioxide activation changed the microstructure of the electrodes,increased the effective surface area of CNTs and optimized the distribution of apertures of the *** oxidization modified the surface characteristics of *** on the polarizable electrodes treated by carbon dioxide activation and acid oxidization,the performances of EDLCs were greatly *** specific capacitance of the electrodes with organic electrolyte was increased from 2..8 F/g to 60.4 F/g.

关键词： carbon nanotube electric double layer capacitor scan electron microscopy

Robust observer-based control for uncertain discrete-time piecewise affine systems

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控制理论与应用（英文版） 2012年第2期10卷 236-243页

作者： Yahui GAO 1 , Zhiyuan LIU 2., Hong CHEN 3 1.AVIC (Aviation Industry Corporation of china) china Aviation Motor Control System Institute, Wuxi Jiangsu 2.4063, china 2.department of Control Science and engineering, harbin Institute of Technology, harbin Heilongjiang 150001, china 3.department of Control Science and engineering, Jilin University, Changchun Jilin 13002., china AVIC (Aviation Industry Corporation of china) china Aviation Motor Control System Institute Wuxi Jiangsu China department of Control Science and engineering Harbin Institute of Technology Harbin Heilongjiang China department of Control Science and engineering Jilin University Changchun Jilin China

The main contribution of this paper is to present a novel robust observer-based controller design method for discrete-time piecewise affine systems with norm-bounded uncertainties. The key ideas are to construct a piecewise quadratic Lyapunov function to guarantee the stability of the closed-loop systems, approximate polytopic operating regions by ellipsoids, and use the singular value decomposition technique to treat the constraint of matrix equality. It is shown that the suggested control method can be formulated as linear matrix inequalities that are numerically feasible with commer- cially available software. A numerical example is also given to verify the proposed approach.

关键词： Piecewise affine systems Robust control Observer Linear matrix inequality

7th CIIE likely to prove solid growth platform for many companies

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china Textile 2024年第4期 20-21页

作者： china Daily

The robust demand of the Chinese market and the improving business environment in the country make china a big growth opportunity for companies wishing to further expand their operations,said corporates that have registered to participate at this year's china International Import *** 7th edition of the annual CIIE,to be held in Shanghai from Nov 5 to 10,started its 100-day countdown on Saturday.

关键词： companies likely operations

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Corrosion behavior of Zn-Ni-Al_2._3 composite coating

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Rare Metals 2006年第z2期25卷 174-178页

作者： ZHENG Huanyu, AN Maozhong, and LU Junfeng department of Applied Chemistry, harbin Institute of Technology, {2., china [a]department of Applied Chemistry Harbin Institute of Technology Harbin 150001 China

The corrosion behavior and anti-corrosion mechanism of the Zn-Ni-Al2.3 composite coating were investigated by SEM, EDS and XPS. The results indicate that the corrosion type of the Zn-Ni-Al2.3 coatings in neutral 5 wt.% NaCl solution is uniform corrosion. The presence of compact and uniformly dispersed nano alumina particles substantially inhibits the corrosion of Zn-Ni-Al2.3 composite coatings. In the initial corrosion stage, the corrosive products of Zn-Ni matrix form a compact ZnCl2.4Zn(OH)2.layer. With the development of corrosion, some nano alumina particles are embedded and form a Ni enrichment layer. In Ni enrichment layer, Ni presents as Ni and NiO.

关键词： Zn-Ni nano alumina corrosion composite electrodeposition

Some invariant properties of ordered information systems under homomorphism

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Science china(Information Sciences) 2010年第9期53卷 1816-1825页

作者： WANG ChangZhong1*,CHEN DeGang2.& HU QingHua3 1department of Mathematics,Bohai University,Jinzhou 12.000,china 2.0} of Mathematics and Physics,North china Electric Power University,Beijing 102.06,china 3Power engineering,harbin Institute of Technology,harbin 150001,china 1. department of Mathematics Bohai University Jinzhou 121000 China2. Department of Mathematics and Physics North China Electric Power University Beijing 102206 China3. Power Engineering Harbin Institute of Technology Harbin 150001 China

In this paper,some properties of ordered information systems under homomorphism are *** concept of a consistent function with respect to dominance relations is first introduced and its properties are ***,some main invariant properties of dominance relations under relation mappings are *** is proven that attribute reductions in the original ordered information system and its image system are equivalent under the condition of *** means of the results,we can get the smaller image system that has the same reducts as a given massive ordered information system.

关键词： consistent function dominance relation ordered information system homomorphism reduction

Catalysts for decomposing ozone tail gas

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Journal of Environmental Sciences 2003年第6期15卷 779-782页

作者： LIU Chang-an, SUN De-zhi, WANG Hui, LI Wei (department of Environmental Science and engineering, {2. Institute of Technology, harbin 150001,china. department of Environmental Science and engineering Harbin Institute of Technology Harbin 150001

The preparation of immobilizing-catalysts for decomposing ozone by using dipping method was studied. XRD, XPS and TEM were used to characterize the catalysts. The three kinds of catalysts were selected preferentially, and their catalytic activities were investigated. The results showed that the catalyst with activated carbon dipping acetate(active components are Mn:Cu=3:2. active component proportion in catalyst is 15%, calcination temperature is 2.0℃) has the best catalytic activity for ozone decomposing. One gram of catalyst can decompose 17.6 g ozone at initial ozone concentration of 2.5 g/m 3 and the residence time in reactor of 0.1 s. The experimental results also indicated that humidity of reaction system had negative effect on catalytic activity.

关键词： ozone tail gas catalytic decomposition immobilizing-catalyst MnO 2 CuO

The Process of TiB_2.Cu Composite Phase and Structure Formation during Combustion Synthesis

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Journal of Wuhan University of Technology(Materials Science) 2006年第4期21卷 113-116页

作者：徐强 School of Materials Science and engineering Beijing Insitute of TechnologyBeijing 100081China

The reaction process of combustion synthesis for TiB2.-Cu was investigated in detail using combustion-wave arresting experiment, X-ray diffraction （ XRD ） analysis, SEM analysis and differential thermal analysis （ DTA ）. The XRD analysis results for the different parts of the quenched specimen show that TiCux intermetallic phase firstly forms with the propagation of combustion wave, and then Ti1.87 B50 and Ti3B4 metastable phases come forth due to the diffusion of B atoms and finally the stable TiB2.phase forms because of the continuous diffusion of B atoms. The formation of TiB2.phase is uot completed by one step, but undergoes several transient processes. The process of reaction synthesis for Ti-B-Cu ternary system can be divided into three main stages： melting of Cu and Ti , and the formation of Cu- Ti melt and few TiCux , TiBx intermetallic phases ; large numbers of TiCux intermetallic phases formation and some fine TiB2.particles precipitation ; and the TiB2.particles coarsening and the stable TiB2.and Cu two phases formation in the final product.

关键词： combustion synthesis reaction process TiB2.phase combustion-wave arresting experiment

State feedback stabilization of discrete linear switching systems subject to nonsymmetrical state and control bounds

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控制理论与应用（英文版） 2012年第2期10卷 216-222页

作者： Zhiyuan LIU 1 , Guowei FAN 1 , Hong CHEN 2.1.department of Control Science and engineering, {2. Institute of Technology, {2. Heilongjiang 150001, china 2.department of Control Science and engineering, Jilin University, Changchun Jilin 13002., china department of Control Science and engineering Harbin Institute of Technology Harbin Heilongjiang China department of Control Science and engineering Jilin University Changchun Jilin China

Stabilization problem of discrete-time linear switching systems with bounds on the state and control input is solved in this paper. First, the synthesis of state feedback controllers that ensure the stability of closed-loop switching systems is studied under a sufficient condition. By using the idea of positive invariance, a stabilizing controller design methodology is proposed. Based on these results, the convergence rate problem is also discussed. A state feedback controller that guarantees the optimal convergence rate of closed-loop switching systems is obtained via optimization. Finally, an example made up of two subsystems is studied to show the application of our method.

关键词： Switching systems Constraints Stabilization problem Convergence rate problem

microRNA-181b targets MLK2.in HL-60 cells

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Science china(Life Sciences) 2010年第1期53卷 101-106页

作者： CHEN Hong1,CHEN Qun2.FANG Ming3 & MI Yan1 1 The First Affiliated Hospital of harbin Medical University,harbin 150101,{2. 2.harbin Acheng District People’s Hospital,harbin 150300,{2. 3 Graduate department of harbin Medical University,harbin 150001,{2. 1. The First Affiliated Hospital of harbin Medical University Harbin 150101 China2. Harbin Acheng District People’s Hospital Harbin 150300 China3. Graduate department of Harbin Medical University Harbin 150001 China

microRNAs(miRNAs) play critical roles in many different cellular processes,including metabolism,apoptosis,differentiation and *** showed miR-181b to be highly expressed in acute myeloid leukemia(AML).Furthermore,miR-181b contributed to proliferation of AML cells by targeting *** results demonstrated that miR-181b plays an important role in the biology of AML and may be useful in developing therapies targeting miRNAs.

关键词： microRNA-181b MLK2 AML HL-60 proliferation apoptosis

Mathematic Expression of Kinetic Compensation Effect and Relationship between the Exothermic Decomposition Temperature and Critical Temperature of Thermal Explosion of Eighty-six Energetic Materials

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含能材料 2001年第1期9卷 8-9页

作者： HU Rong zu 1, YANG De suo 2. ZHANG Jiao qiang 3 (1. department of Chemistry,Northwest University, Xi′an 710065, china 2. department of Chemistry and Chemical engineering, Baoji College of Arts and Science, Baoji 72.007, china 3. department of 西北大学陕西西安 710065 宝鸡文理学院陕西 721007 西北工业大学陕西西安 710072

Two relationships are established using the least squares method,between the kinetic parameters (the apparent activation energy and pre exponential constant),and the exothermic decomposition temperature and ther... 详细信息

关键词： critical temperature of thermal explosion decomposition temperature DSC energetic materials.