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Nonlinear Boundary Stabilization of Nonuniform Timoshenko Beam

Acta Mathematicae Applicatae Sinica 2003年第2期19卷 239-246页

作者： qing-xuyan Hui-chaoZou De-xingFeng InformationEngineeringSchool ChinaGeoscienceUniversityBeijing100083China DepartmentofMathematicsandComputerScience YantaiTeachersCollegeYantai264025China InstituteofSystemsScience AcademyofMathematicsandSystemSciencesChineseAcademyofSciencesBeijing100080China

Abstract In this paper, the stabilization problem of nonuniform Timoshenko beam by some nonlinear boundary feedback controls is considered. By virtue of nonlinear semigroup theory, energy-perturbed approach and exponential multiplier method, it is shown that the vibration of the beam under the proposed control action decays exponentially or in negative power of time t as t M X.

关键词： Keywords Timoshenko beam boundary feedback stabilization nonlinear semigroups exponential multiplier energy perturbed method

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Development State of Graphite Electrodes for UHP EAF in China

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China's Refractories 1995年第2期4卷 24-25页

作者： BAOSiwen xuyan－qing 等 ReporterofMetallurgicalPaper China LuouangInstituteofRefractoriesResearch 43XiyanRoadLuoyangHenan47

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Effect of CeO2 on Sintering and Hydration Resistance of Natural Dolomite

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China's Refractories 1996年第1期5卷 17-20页

作者： xuyan－qing CHENZhao－you LuoyangInstituteofRefractoriesResearch LuoyangHenan471039China LuoyangInstituteofRefractoriesResear

The sinteribility and hydration resistance of high pure natural dolomite doped with CeO2 addition were *** is found that the addition of CeO2 to dolomite can significantly improve the sintering and the resistane to hydration of *** 0.25% CeO2,followed by firing at 1600℃ for 4 hours,a dense doloma clinker with bulk density>3.25 g/cm^3, apparent porosity<1.0% and excellent hydration resistance has been obtained.

关键词：耐烧结耐火材料白云石耐火化作用二氧化铈

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Development and Application of High Quality Magnesite—Chrome Bricks fro VOD Refining Furnace

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China's Refractories 1995年第1期4卷 17-20页

作者： CHENKai－xian xuyan－qing 等 FoshanZhongnanGlassFactory LuoyangInstituteofRefractoriesResearch43XiyuanRoad LuoyangHenan471039P.R

The paper describe the process of producing high quality magnesite-chrome bricks for VOD refining furnace,The Service life reaches 14 heasts,average life 12 *** studies show that the wear of the magnesite-chrome bricks is mainly due to chemical corrosion,thermal spalling induced by thermal shock and the corro-sion aroused from accumulation of molten mate-rials in transitional zone.

关键词： VOD精炼炉菱镁矿砖耐火材料铬合金 Cr

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STUDY OF IMPACT OF ESTABLISHMENT OF A DAM ON LOCAL TIDAL CURRENTS IN KENDONG OIL FIELD

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Journal of Hydrodynamics 2004年第3期16卷 356-365页

作者： LIUHao YINBao-shu YUKe-jun YANGDe-zhou xuyan-qing InstituteofOceanology ChineseAcademyofSciencesQingdao266071China InstituteofOceanology.ChineseAcademyofSciences Qingdao266071China

In this paper a three-dimensional tidal current model has been used toexamine variations of local fluid field due to establishment of a dam. By imputing ten tides-K_1,O_1, P_1 , Q_1, M_2, S_2, N_2, K_2 , S_a and S_(sa) through the open boundary of the Bohai straitand adopting 5′ x 5′ horizontal resolution the whole fluid field of the Bohai Sea was firstsimulated. The computed harmonic constants of m_1 and M_2 tides at seventeen observational stationsalong the coast of the Bohai Sea matched the observed values rather well. Taking the calculatednumerical results as open boundary conditions, the local fluid field in the Kendong Oil Field bymeans of 1′ x 1′ horizontal resolution was then investigated. In the course of calculation, finegrids were embedded in coarse grids so as to enhance the computational order. In addition, thelatest water-depth data of the Huanghe Delta coast area were adopted, thus topographic changesbecause of silt sediment in that region wouldn''t affect the computed results. In the end, byanalyzing the relative changes of the fluid field before and after the dam was established, that theeffect on the dynamic environment of the local sea area mainly concentrated on the adjacentpositions north and south of the dam was suggested.

关键词： tidal current harmonic constants open boundary frequency analysis

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