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ZHOU Donghua 《清华大学学报》1999,4(4):1597-1601
IntroductionNonlinearobserversarenecessaryfornonlinearcontrolsystemswhentherearenotenoughsensorstomeasureallthestatesoritisdifficulttomeasuresomeofthestatesbysensors.Sinceitsintroduction[1],nonlinearobservershaveattractedtheattentionofmanyresearchers… 相似文献
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Thesurvivabilityofamissilesiloagainstablastwaveconstitutesacriticalissuefornationaldefense.Atriplelayerstructureisdesignedtostrengthentheprevioussinglelayerdesign.AsshowninFig1,thebottomlayerisacircularplatemadeofreinforcedconcrete(RC).Tworingsofsimples… 相似文献
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Thedioxotetraamineligandspossessthestructuressimilartothoseoftheoligopeptides .Theyareabletoformstablecomplexeswithtransitionmetalions .Theirtwoamidemoietieslosehydrogenionsduringcoordinationwithdivalentmetalions,thereforetheyareabletosta bilizehighoxid… 相似文献
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Lou Qin |jian Sarem Mu dar Li Rui |xuan Xiao Wei |jun Lu Zheng |ding Chen Chuan |bo School of Computer Science Technology Huazhong University of Science Technology Wuhan Hubei China 《武汉大学学报:自然科学英文版》2003,8(1):21-27
0 IntroductionTheneedforintegrationofdifferentdatabasemanagementsystems (DBMSs) ,makingdifferencesbetweenthesesystemsinvisibleandprovidinguserswithauniformaccesstoallthedatabaseshasgrownrapidlyduringthelastdecade .However,databaseautonomyandheterogeneity… 相似文献
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1 IntroductionInRef.〔1〕 theasymptoticstabilityofnonlinearslowlychangingsystemhasbeendiscussed .InRef.〔2〕theinstabilityofsolutionforthethirdorderlineardif ferentialequationwithvariedcoefficienthasbeendis cussed .Inthispaper,wehavediscussedstablilityandinsta… 相似文献
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Packingsandpackedcolumnsarewidelyusedinmanyprocessesinchemicalindustryandenvironmentaltechnology .Incontrasttoplasticandceramicmaterials ,stainlesssteelpackingsownadvantagesfortheirelasticityandfirmness.However,theirmasstransferperformancehasrecentlybee… 相似文献
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显著提高大肠杆菌中外源基因表达产物可溶性的双顺反子表达载体pNJUTRX-1 总被引:1,自引:1,他引:0
TheexpressionofheterologousproteinsinEscherichiacolihasbecomeastandardtech niqueinmolecularbiology .E .coliexpressionsystemshavetheadvantagesofproductioneco nomicsandlogistics .TheseadvantageshavemadeE .coliexpressionsystemapopularchoicefortheproductionof… 相似文献
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IntroductionImmuosensorsaresomeofthemostpromisingbiosensorsbecauseoftheireffectivenessandsensitivity[1] .Immunoassaysareusedtomeasuretheinteractionofantigensandantibodiesas partofimportantresearchonthephysiologyofanorganismantiinfectivity ,informationtra… 相似文献
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IntroductionRecently,smallsatelliteshavebeenrapidlydevelopedas‘faster,cheaper,better’meansofcarryoutspacemissionsandascomplementstoconventionallargesatellitesystems.Manypredictthatsmallsatelliteswillleadtoarevolutionbothinsatelliteengineeringandinitsap… 相似文献
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IntroductionThemostcommonmethodofyarnproductionistheinsertionofcontinuous ,unidirectionaltwistintoaparallelarrayoffibersorfilaments.Thehightorsionalstressesgeneratedinsuchaprocesshaveaconsiderableeffectonthestabilityandmechanicalcharac teristicsoftheya… 相似文献
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Theabrasionresistanceofyarnsisveryimportantforthedownstreamprocessingandend use ;manyresearchworkscon cernedaboutthisaspecthavebeendone[1~ 17] .Although ,becauseofthedifferenceinstructuresandproperties ,thebehavioroftheabrasionresistanceofdifferentyarnsisdif… 相似文献
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0 IntroductionAsthethirdlargestriverintheworldandthelargestriverinChina ,theYangtzeRiverissoimportanttohumansocietyinChinathatitisamirrorofChinesehistory .Sinceancienttimes,peopleinitsbasinshavebeensufferingfromandfightingagainstflooddisastersfromgenera… 相似文献
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IntroductionNumericalsimulationofrotorstatorinteractionshasreceivedwidespreadattentioninthelastfewyearsbecauseoftheincreasinginterestinunderstandingtheunsteadynatureofflowsinturbomachinery.Therealflowsinsideaturbineoracompressorareunsteadyandarechara… 相似文献
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IntroductionThemainmissionofpowerplantsimulatorsistoprovideinvaluabletrainingtoplantoperationalpersonnel.Todaythesimulatorshavebeenwidelyusedandtheirtrainingvalueshavebeenwellrecognized.Overthepastthreedecades,thesimulatorshavegonethroughseveralmajor… 相似文献
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IntroductionFibrebundletensiletesterswereoriginallydevelopedandstandardisedforcottonfibres[1,2 ] .Thepurposewastogivearapidmeasurementofmeanfibrestrengthwhichavoidstheneces sityofmeasuringalargenumberofsinglefibres.Thefibrebundletesterwaslaterusedforwoolf… 相似文献
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Progressive Failure Simulation for Damaged Composite Laminates Using Nonlinear Finite Element Method
IntroductionThelongitudinaltensilepropertyofunidirectionalcompositeplateismainlydeterminedbythefiber.Thestressstrainrelationislinearforawidestrainrange,butthestressstrainrelationintransversedirectionandinshearisgenerallynonlinear.HahnandTsai[1]inve… 相似文献
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IntroductionElectrolessNi Pplatingalloywhichbearsexcellentqualitiesofanti causticityandanti attritionhasabroadapplicationsintheindustryproduction Butinsomecases,itcannotgetgoodresultsbyusingonlyNi Pplatingalloyassurfacedefenseorconsolidationmaterials It… 相似文献
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Therehasrecentlybeenasurgeofinterestinmarinebioresources,particularlyseaweeds,assourcesofbioactivesubstances.Amongthesestudies,ithasbeenshownthatpreparationsofseaweedsuchaspolysaccharide,peptideandphycobiliproteincanaffectthemultiplicationoftumorcells.M… 相似文献