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简介:Weanalyzedthephenomenonofferrofluidmagnetoviscosityinhigh-permeabilitywall-regionnon-magneticporousmediaoftheMullerkind.Afterupscalingthepore-levelferrohydrodynamicmodel,weobtainedasimplifiedvolume-averagezero-orderaxisymmetricmodelfornon-Darcynon-turbulentflowofsteady-stateisothermalincompressibleNewtonianferrofluidsthroughaporousmediumexperiencingexternalconstantbulk-floworientedgradientmagneticfield,ferrofluidself-consistentdemagnetizingfieldandinducedmagneticfieldinthesolid.Themodelwasexploredincontextsplaguedbywallflowmaldistributionduetolowcolumn-to-particlediameterratios.Itwasshownthatforpropermagneticfieldarrangement,wallchannelingcanbereducedbyinflatingwallflowresistancethroughmagnetovisco-thickeningandKelvinbodyforcedensitywhichrerouteafractionofwallflowtowardsbedcore.
简介:Elmannetworks'dynamicalmodelingcapabilityisdiscussedinthispaperfirstly.AccordingtoElmannetworks'uniquestructure,aweighttrainingalgorithmisdesignedandanonlinearadaptivecontrollerisconstructed.WithoutthePEpresumption,neuralnetworkscontroller'sclosed-looppropertiesarestudiedandthewholeElmannetworks'passivityisdemonstrated.
简介:ByapplyingtheHeavisidefunction,theequationsgoverninglaminatedplatespossess-ingspatiallydistributedpiezoelectricpatcheshavebeenestablished.Basedontheseequations,staticshapecontroloflaminatedplatesisdiscussed.Byusingageneticandcollocationalgorithm,theopti-mallocationsandscalesofthesepiezoelectricpatcheshavebeenselected.Numericalexamplesarepre-sentedtoillustratetheefficiencyofthealgorithmandthepiezoelectricactuators.
简介:Duetotheupcomingdemandsofnext-generationelectronic/magnetoelectronicdeviceswithlow-energyconsumption,emergingcorrelatedmaterials(suchassuperconductors,topologicalinsulatorsandmanganites)areoneofthehighlypromisingcandidatesfortheapplications.Forthepastdecades,manganiteshaveattractedgreatinterestduetothecolossalmagnetoresistanceeffect,charge-spin-orbitalordering,andelectronicphaseseparation.However,theincapableofdeterministiccontrolofthoseemerginglow-dimensionalspinstructuresatambientconditionrestricttheirpossibleapplications.Therefore,theunderstandingandcontrolofthedynamicbehaviorsofspinorderparametersatnanoscaleinmanganitesunderexternalstimuliwithlowenergyconsumption,especiallyatroomtemperatureishighlydesired.Inthisreview,wecollectedrecentmajorprogressesofnanoscalecontrolofspinstructuresinmanganitesatlowdimension,especiallyfocusingonthecontroloftheirphaseboundaries,domainwallsaswellasthetopologicalspinstructures(e.g.,skyrmions).Inaddition,capacitor-basedprototypespintronicdevicesareproposedbytakingadvantageoftheabovecontrolmethodsinmanganites.Thiscapacitor-basedstructuremayprovideanewplatformforthedesignoffuturespintronicdeviceswithlow-energyconsumption.
简介:HL-2Aisatokamakwithcloseddivertor.Ithadbeenbuiltattheendof2002andbegantodischargefromthenon.TofurtherstudyplasmadischargesinHL-2A,afeedbackcontrolsystem(FBCS)forplasmapositionbadbeendevelopedin2003.
简介:Thecombinationoflaserdiffractionwithupstreamsamplingrealizedabreak-throughforthein-andon-lineparticlessizeanalysisinindustrialapplications.Today,thecombinationofrepresentativesampling,drydispersion,particlesizeanalysisbylaserdiffractionandintegratedfeedbackofthesampleiswellacceptedinmanyindustrialapplications.Nomoreinteractionsoftheuserarerequired,andforstandardapplicationstheon-linemonitoringofparticlesizesbecamenearlyassimpleasthernonitodngofanyotherprocessparameter.Theincreaseofinspectionintervalfrom24-houroperationtomonthshasincreaseduserconfidenceinthistechnology,andindustrieswithmoredemandingmeasurementrequirementsareseekingtobenefitfromthisperformance.Thischallengecouldnotbesolvedwithsimplescale-upsorscale-do,he.Newsolutionshadtobefoundforthesamplingsystem,themeasuringsensor,theadaptationtotheenvironmentalconditionsandtheprocessingoffeslgrowingvolumeofdata.
简介:Inthispaper,weformulateasingle-speciesmodelofcontraceptioncontrolwithwhitenoiseonthedeathrate.Firstly,theuniquenessofglobalpositivesolutionofthemodelisproved.Secondly,uniformlyboundedmeanofsolutionisobtainedbyusingtheLiyapunovfunctionandChebyshevinequality.Lastly,stochasticglobalasymptoticstabilityofzeroequilibriumsisanalyzed.
简介:ThispaperdealswiththeoutputfeedbackH∞controlproblemforaclassofnonlinearstochasticsystems.Basedonthelatestdevelopedtheoryofstochasticdissipation,anotableresultaboutthenonlinearH∞outputfeedbackcontrolofdeterministicsystemisgeneralizedtothestochasticcase.Finally,inthecasesofstatefeedbackandoutputfeedback,twofamiliesofcontrollersareprovidedrespectively.
简介:Thispaperconsiderstheoptimaltrafficsignalsettingforanurbanarterialroad.Byintroducingtheconceptsofsynchronizationrateandnon-synchronizationdegree,amathematicalmodelisconstructedandanoptimizationproblemisposed.Then,anewiterativealgorithmisdevelopedtosolvethisoptimaltrafficcontrolsignalsettingproblem.Convergencepropertiesforthisiterativealgorithmareestablished.Finally,anumericalexampleissolvedtoillustratetheeffectivenessofthemethod.
简介:Recently,someresearchesindicatethatpositivefeedbackcanbenefitthecontrolifappropriatetimedelayisintentionallyintroducedintocontrolsystem.However,mostworkistheoreticalonebutfewareexperimental.Thispaperpresentstheoreticalandexperimentalstudiesofdelayedpositivefeedbackcontroltechniqueusingaflexiblebeamasresearchobject.Thepositivefeedbackweightingcoefficientisdesignedbyusingtheoptimalcontrolmethod.Theavailabletimedelayisdeterminedbyanalyzing...