简介:Anumericalsolutionoftheweightfunctionforatwo-electrodeelectromagneticflowmeterwasproposed.Thesolutionwasobtainedbyusingthefiniteelementmethodbasedonthebasicequationofatraditionaltwo-electrodeelectromagneticflowmeter.Thetwo-dimensionaldistributionoftheweightfunctionoftheelectromagneticflowmeterobtainedwasverifiedbytheanalyticalsolution.Three-dimensionaldistributionoftheweightfunctionwasalsopresentedinthepaper.Itcanbeemployedtoanalyzethesensitivityandlinearityoftheelectromagneticflowmeterwithnon-uniformmagneticfield,andeventoassistthedesignoftheexcitationcoilpair.
简介:Byusingthefundamentalequationsofaxisymmetricshallowshellsofrevolution,thenonlinearbendingofashallowcorrugatedshellwithtaperunderarbitraryloadhasbeeninvestigated.ThenonlinearboundaryvalueproblemofthecorrugatedshellwasreducedtothenonlinearintegralequationsbyusingthemethodofGreen'sfunction.Tosolvetheintegralequations,expansionmethodwasusedtoobtainGreen'sfunction.ThentheintegralequationswerereducedtotheformwithdegeneratecorebyexpandingGreen'sfunctionasseriesofcharacteristicfunction.Therefore,theintegralequationsbecomenonlinearalgebraicequations.Newton'siterativemethodwasutilizedtosolvethenonlinearalgebraicequations.Toguaranteetheconvergenceoftheiterativemethod,deflectionatcenterwastakenascontrolparameter.Correspondingloadswereobtainedbyincreasingdeflectiononebyone.Asanumericalexample,elasticcharacteristicofshallowcorrugatedshellswithsphericaltaperwasstudied.Calculationresultsshowthatcharacteristicofcorrugatedshellschangesremarkably.Thesnappinginstabilitywhichisanalogoustoshallowsphericalshellsoccurswithincreasingloadifthetaperisrelativelylarge.Thesolutionisclosetotheexperimentalresults.
简介:AradialfunctioncanbeexpressedbyitsgeneratorthroughThepositivedefiniteofthefunctionplaysanimportantroteintheradialbasisinterpolation.WecannaturallyuseBochner’sTheoremtocheckifispositivedefinite.Thisrequireshoweveran-dhnensiotialFouriertransformationanditisnotveryeasytocalculate.Furthermoreinalotofcaseswewilluseforspacesofvariousdimensionstoo,thenforeveryfixednweneeddotheFouriertransformationoncetocheckifthefunctionispositivedefiniteinthen-di-mensionalspace.Thecompletelymonotonefunction:,whichisdiscussedin[4]ispositivedefiniteforarbitraryspacedimensions.Withthistechniquetvecanveryeasilycharacterizethepositivedefinite,ofaradialfunctionthroughitsgenerator.Unfortunatelythereisonlyaverysmallsubsetofradialfunctionwhichiscompletelymonotone.Thusthiscriterionexcludedalotofinterestingfunctionssuchascompactlysupportedradialfunction,whcihareveryusefulinapplic
简介:Inordertoreducenursingintensityandimprovefreedomoftheelderlyandthedisabled,amulti-functionnursingwheelchairwhichcanswitchchairtobedandrealizemanykindsofposturetransformationisdesigned.Thispaperintroducesthemechanicalstructuredesign(positionadjustmentmechanismandvariablewheelbasemechanism)andcontroldesignofposturetransformationunitofmultifunctionalnursingwheelchair.
简介:WeproposethevariationaldescriptionofgeneratingfunctionapproachoffirstkindforHamil-tonianODEs,andextendtheapproachtothesemi-linearwaveequations.Inthisway,wecanconstructanyfiniteorderaccuracyscheme,andshowthattheresultingnumericalschemeismultisymplectic.Atlast,wepresentsomenumericalexperimentsbyusingderivednewscheme.
简介:DuringtheHercgnianmovcment,SouthChinadevelopedintothepeakperiodofPlatformstage,whichbecameapartofthcAncicntEastChinaPlatformReSion.However,thcreepisodicallyand1ocal-lyoccurredrelativclymobilcbeltsnamcdau1acogcnsduringthispcriod.Thcseaulacogens,suchasthemiddle-lowerYangtzerivcr,thePingxian-Lcping,the
简介:ApeaknormisdefinedforLpspacesofE-valuedBochnerintegrablefunctions,whereEisaBanachspace,andbestapproximationsfromasuntoelementsofthespacearecharacterized.Applicationsaregiventosomefamiliesofsimultaneousbestapproximationproblems.
简介:无
简介:Anewwaveletvarianceanalysismethodbasedonwindowfunctionisproposedtoinvestigatethedynamicalfeaturesofelectroencephalogram(EEG).TheexprienmentalresultsshowthatthewaveletenergyofepilepticEEGsaremorediscretethannormalEEGs,andthevariationofwaveletvarianceisdifferentbetweenepilepticandnormalEEGswiththeincreaseoftime-windowwidth.Furthermore,itisfoundthatthewaveletsubbandentropy(WSE)oftheepilepticEEGsarelowerthanthenormalEEGs.
简介:Intheanalysisoneconomicgrowthfactors,calculatingthecontributionrateofinfluencingfactortoeconomicgrowthusingtheCESproductionfunctionmodelisacommonandimportantresearchfield.TheCESproductionfunctionmodelhasavarietyofforms,andthesuperpositionCESproductionfunctionmodelproposedinthepaperisanewmodel.Withregardtothemodel’sparameterestimation,thepaperproposesamodifiedparticleswarmoptimizationwhichhasafastconvergencerateandahighprecision.Withregardtothecalculationoffactorcontributionrate,thepaperoffersanewscientificcalculationmethodwiththesuperpositionCESproductionfunctionmodel.Atlast,thepapermakesanempiricalanalysisonthecontributionrateofChineseeconomicgrowthfactorsandtheresultobtainedconsistswiththereality.