共查询到20条相似文献,搜索用时 15 毫秒
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Packingsandpackedcolumnsarewidelyusedinmanyprocessesinchemicalindustryandenvironmentaltechnology .Incontrasttoplasticandceramicmaterials ,stainlesssteelpackingsownadvantagesfortheirelasticityandfirmness.However,theirmasstransferperformancehasrecentlybee… 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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IntroductionFibrebundletensiletesterswereoriginallydevelopedandstandardisedforcottonfibres[1,2 ] .Thepurposewastogivearapidmeasurementofmeanfibrestrengthwhichavoidstheneces sityofmeasuringalargenumberofsinglefibres.Thefibrebundletesterwaslaterusedforwoolf… 相似文献
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IntroductionThemainmissionofpowerplantsimulatorsistoprovideinvaluabletrainingtoplantoperationalpersonnel.Todaythesimulatorshavebeenwidelyusedandtheirtrainingvalueshavebeenwellrecognized.Overthepastthreedecades,thesimulatorshavegonethroughseveralmajor… 相似文献
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Li Li Department of Computer Science Southwest China Normal University Chongqing 《西南师范大学学报(自然科学版)》1999,(5)
IntroductionCase Based ReasoningCase based Reasoning (CBR)isa processof“rememberand adapt”or“memberand compare”[1] .Casesare usedtohelpin understandingand assessingsituationsandtohelpinsolving problems. CBRistoretrievethe“mostsimilar”caseorsetofcases,itscyc… 相似文献
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IntroductionThephotosynthesislightreactionin plantsoccursinthethylakoidmembraneofthechloroplasts .Theproteincomplexesinthethylakoidmembranesaresupermolecularsystemsconsistingof proteins ,lipidsand pigmentswhichregulateandcontrolthelightenergyabsorption ,… 相似文献
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Transfusionbloodorbloodcomponentswithwhitecellsoftencausessideeffectsuchasfebriletransfusionreactionsandalloim munization ,evenindangeroflife[1,2 ] Inaddition ,somevirusrelatedtotransfusionresultsinitscontaminationbecauseoftrans fusingwhitecellsintobody[3~ 5… 相似文献
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IntroductionInthestudyofanelectricalnetworkorapowersystem,theconceptofenergyfunctionisveryusefulindeducingthetransientstabilityofthesystem.BasedondissipativetheoryandnonlinearH∞approach,thispaperdiscussestwospecialsupplyrates,whichcorrespondtopassivi… 相似文献
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1 IntroductionInthispaper ,weconstructanewthreefieldvariationalformulation ,whichalsoregardsstress ,velocityandpressureasvariables ,forthequasi Newtonianflowploblem ,wediscussitsnon conformingfiniteelementapprox imation ,onlybyassumingaLBBconditionbetweenthe… 相似文献
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IntroductionTherearemanyconstitutiveequationsforviscoelasticfluids,amongwhichOldroydB,GiesekusandPTT(PhanThienTanner)modelsarewidelyused.Allthesemodelsareanalogoustothespringdashpotmechanicalsystem.Themathematicalbasisofthesemechanicalmodelsisexplainedb… 相似文献
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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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Chaoticsystemindicatesthesensitivedependenceoninitialconditions.Theslightdevia tionofinitialconditionscanbeamplifiedtotheremarkablydifferentresults .Theunpredictablenoise likenatureofchaoticsignalspromisesthepotentialapplicationformaskinginformationsig… 相似文献
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IntroductionThemethodologyofmulticlassifiercombinationattractsextensiveattentionfromresearchersinthefieldofpatternrecognition.Mostresearchesfocusonhowtoselectthebestresultfromthosegivenbyseveraldifferentclassifiersforthepurposeofthebestrecognitionra… 相似文献
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Buoy Relay Method for Instantaneous Fluid Flow with Free Surface 总被引:1,自引:0,他引:1
IntroductionFreeboundariesaresurfacesonwhichdiscontinuitiesexistinoneormorevariables.Examplesarefreesurfaces(bubblesordroplets),materialinterfacesorinterfacesbetweenfluidsandflexiblestructures.Threetypesofproblemsariseinthenumericaltreatmentoffreebound… 相似文献
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Recently ,theresearchofartificialsuperlatticeshasbeenahottopicincondensedmatterphysicsandmaterialsfield .Before 1 984,researchworksonsuperlatticesweremainlyfocusedonperiodicstructures .Thediscoveryofquasicrystalhasopenedupanewfieldincondensedmatterphysicsa… 相似文献