简介:许多尝试被做了为学习微粒媒介的行为为不同参数和某些组成的模型发现各种各样的关系。所有这些模型基于连续媒介的概念。用象分离元素方法那样的一个数字方法,一个人能弄明白什么正在发生通过一玷污粒子的不连续的媒介在介绍shear力量和变丑特征起主要作用。有易碎的粒子的媒介的行为与非易碎的粒子在这份报纸并且与集会的相比被学习。在这份报纸,夸张有弹性的模型被调查因为多角形的集会在二个不同测试系列塑造了粒子。另外,象卷紧张,磨擦的角度,膨胀性的角度和有弹性的模量那样的汇编的不同的宏参数的进化为非易碎、易碎的土壤粒子两个都在模拟测试期间被学习。在结束,参量的研究在集会行为上在粒子破裂的力量的效果上被执行。
简介:ParticlebasedmodelsofcompositeanodesareusefultoolsforexploringthebehaviorofSOFCsystems.Aspartofoureffortstodevelopmodelsforunderstandingfuelcells,wehavebeenbuildingmodelsofNi-YSZcompositeanodesusingexperimentallymeasuredparticlesizedistributions.Theobjectivesofthisstudyweretocharacterizethepercolationthresholdandconductivityofthesemodelsincomparisontosimplermonodispersedandbiphasicparticlesizedistributionsfromtheliterature.Wefoundthattheaveragevaluesfortheonsetofpercolationandthemeasuredconductivityofthemodelswithexperimentallymeasuredparticlesizedistributionsaresimilartothoseforthesimpledistributionsandtheexperimentallymeasureddistributions.Foralloftheconfigurationsevaluated,theonsetofpercolationintheNickelphaseoccurredatasolidfractionofNickelbetween20%and25%.ThiscorrespondedalmostexactlytothepointatwhichthecoordinationnumberbetweenNickelphaseparticlesreached2.2.Thesignificantfindingwasthatthevariationinthevaluefortheconductivity,asmeasuredbythestandarddeviationoftheresults,wasseveralordersofmagnitudehigherthanforthesimplersystems.Weexploredthevalidityofourassumptions,specificallytheassumptionofrandomparticleplacement,bybuildingaparticlemodeldirectlyfromFIB-SEMdata.Inthisreconstruction,itwasclearthatthelocationofparticleswasnotrandom.Particlesofthesametypeandsizehadmuchlikelihoodofcontacthigherthanwouldindicatedbyrandomlocation.
简介:Rareearthuhrafineparticlehasbeenpaidagreatattentiontoinrecentyearsaroundtheworldbecauseofitsincreasingapplicationsinfunctionalmaterials.Preciseceramicsisatypicalexample.Thepartiealsizesfortheproductnowavailableareusuallyintherangeof100-1000(1=1010m)withlargespecificsurface,say,70—120m2/g.Ultrafinepowdersareusuallyclassifiedinto3gradesdependingontheirpar-ticlesizes,thusthefirstbeingintherangeof10—
简介:Themulti-scalestructuresofcomplexflowsinchemicalengineeringhavebeengreatchallengestothedesignandscalingofsuchsystems,andmulti-scalemodelingisthenaturalwayinresponse.Particlemethods(PMs)areidealconstituentsandpowerfultoolsofmulti-scalemodels,owingtotheirphysicalfidelityandcomputationalsimplicity.Especially,pseudo-particlemodeling(PPM,Ge&Li,1996;Ge&Li,2003)ismostsuitableformolecularscaleflowpredictionandexplorationoftheoriginofmulti-scalestructures;macro-scalePPM(MaPPM,Ge&Li,2001)andsimilarmodelsareadvantageousformeso-scalesimulationsofflowswithcomplexanddynamicdiscontinuity,whilethelatticeBoltzmannmodelismorecompetentforhomogeneousmediaincomplexgeometries;andmeso-scalemethodssuchasdissipativeparticledynamicsareuniquetoolsforcomplexfluidsofuncertainpropertiesorflowswithstrongthermalfluctuations.Allthesemethodsarefavorableforseamlessinterconnectionofmodelsfordifferentscales.However,asPMsarenotoriginallydesignedaseithertoolsforcomplexityorconstituentsofmulti-scalemodels,furtherimprovementsareexpected.PPMisproposedformicroscopicsimulationofparticle-fluidsystemsasacombinationofmoleculardynamics(MD)anddirectsimulationMonte-Carlo(DSMC).ThecollisiondynamicsinPPMisidenticaltothatofhard-sphereMD,sothatmass,momentumandenergyareconservedtomachineaccuracy.However,thecollisiondetectionprocedure,whichismosttime-consuminganddifficulttobeparallelizedforhard-sphereMD,hasbeengreatlysimplifiedtoaprocedureidenticaltothatofsoft-sphereMD.Actually,thephysicalmodelbehindsuchatreatmentisessentiallydifferentfromMDandismoresimilartoDSMC,butanintrinsicdifferenceisthatinDSMCthecollisionsfollowdesignedstatisticalrulesthatarereflectionoftherealphysicalprocessesonlyinverylimitedcasessuchasdilutegas.PPMisidealforexploringthemechanismofcomplexflowsa
简介:AnExtendedParticleSwarmOptimizer(EPSO)isproposedinthispaper.Inthisnewalgorithm,notonlythelocalbutalsotheglobalbestpositionwillimpacttheparticle'svelocityupdatingprocess.EPSOisanintegrationofLocalBestparadigm(LBEST)andGlobalBestparadigm(GBEST)anditsignificantlyenhancestheperformanceoftheconventionalparticleswarmoptimizers.TheexperimentresultshaveprovedthatEPSOdeservestobeinvestigated.
简介:Twoschemesforteleportinganunknownone-particlestateareproposedwhenageneralWstateisutilizedasquantumchannel.Inthefirstscheme,afterthesender(Alice)makesaBell-statemeasurementonherparticles,therecipient(Bob)performsaVonNeumannmeasurementandintroducesanauxiliaryparticle,andcarriesoutaunitarytransformationonhisparticleandtheauxiliaryparticle,andperformsaVonNeumannmeasurementontheauxiliaryparticletoconfirmwhethertheteleportationsucceedsornot.Inthesecondscheme,therecipient(Bob)doesnotneedtoperformthefirstVonNeumannmeasurementorintroducetheauxiliaryparticle,whichisnecessaryinthefirstscheme.Itisshownthatthemaximalprobabilitiesofsuccessfulteleportationofthetwoschemesareidenticaliftherecipient(Bob)performsanappropriateunitarytransformationandadoptsaproperparticleonwhichherecoversthequantuminformationofstatetobeteleported.
简介:ThisreportgivesabriefintroductiontokeyThaiorganizations,includingresearchinstitutionsandacademicdepartments,activeinparticletechnology.ThisisfollowedbyadescriptionofthelatesttrendofpowdertechnologyandnanoparticletechnologyinThailand.
简介:AsaresultofdiscussionswithintheHEPcommunity,wehavewrittenaC++packagewhichcanbeusedtomaintainatableofparticleproperties,includingdecaymodeinformation.Theclassesallowformultipletablesandacceptinpufromanumberofstandardsources,Inaddition,Theyprovideamechanismbywhichaneventgeneratorcanemploythetabulatedinformationtoactuallydirectthedecayofparticles.
简介:TheD0experiment'sdataandjobmanagementsystemsoftware,SAM,isanoperationalprototypeofmanyoftheconceptsbeingdevelopedforGridcomputing.WeexplainhowthecomponentsofSAMmapintotheDataGridarchitecture,WediscussthefutureuseofGridcomponentstoeitherreplaceexistingcomponentsofSAMortoextenditsfunctionalityandutility.owrkbeingcarriedoutaspartoftheParticlePhysicsDataGrid(PPDG)project.
简介:RelativeEnergyCalibrationforMeasurementofParticleCorrelations¥DuanLimin;LiZuyu;JinGenming;HeZhiyong;LuoQingzheng;WuHey...
简介:Thispapercontributestoextractinginformationfromsignalsofbroadbandultrasonicattenuationspectrumforeffectiveutilizationinparticlesizecharacterization.Thesingleparticlescatteringmodelandthecoupled-phasemodelareformulatedsimultaneously,therelationshipbetweenparticlesizedistributionandultrasonicspectrumisestablished,andaconvergencecriterionforcalculationisquantified.Demonstrationinversionbytheoptimumregularizationfactormethodiscarriedouttoyieldtypicalnumericalresultsfordiscussion.Withtheexperimentalset-updevelopedbytheInstituteofParticleandTwo-PhaseFlowMeasurement(IPTFM)attheUniversityofShanghaiforScienceandTechnology,sandsedimentparticlesizeismeasuredbyattenuationspectrumandanalyzedusingtheaboveinversionalgorithmandtheoreticalmodels.Tovalidatetheproposedultrasonicspectrumparticlesizingmethod,resultsarecomparedwiththoseobtainedbymicroscopy.
简介:Thisreviewcoverstheprogressoflightscatteringapplicationsinthefieldofparticlecharacterizationinthepastdecade.Thereviewaddressesstaticlightscattering(themeasurementofscatteringintensitiesduetolight-particleinteractionatvariousspatiallocations),dynamiclightscattering(themeasurementofscatteringduetolight-particleinteractionasafunctionoftime),andscatteringtrackinganalysis(thetrackingofparticlemovementthroughscatteringmeasurement).
简介:在严肃下面的自发的粒子过滤的现象借助于分离元素方法被调查。象过滤速度,住处时间分发和光线的分散那样的过滤行为在各种各样的条件下面被检验。经过一包更大的粒子移动的一个滤粒子的垂直速度与增加在粒子和滤到包装粒子的直径比率之间的归还系数减少,这被显示出。随归还系数的增加,住处时间和滤粒子的光线的分散增加。收拾行李的高度影响住处时间和光线的分散。但是,效果能在他们分别地到平均住处时间和收拾行李的高度和收拾行李的粒子直径的产品被使正常化的住处时间和光线的分散的分析被消除。另外,当额外的经常的垂直力量被使用时,过滤速度被显示与滤粒子的垂直加速有关。增加滤的喂的率粒子减少分散系数。
简介:Researchontheflowfieldinsideaturboclassifieriscomplicatedthoughimportant.Accordingtothestochastictrajectorymodelofparticlesingas-solidtwo-phaseflow,andadoptingthePHOENICScode,numericalsimulationiscarriedoutontheflowfield,includingparticletrajectory,intheinnercavityofaturboclassifier,usingbothstraightandbackwardcrookedelbowblades.Computationresultsshowthatwhenthebackwardcrookedelbowbladesareused,themixedstreamthatpassesthroughthetwobladesproducesavortexinthepositivedirectionwhichcounteractstheattachedvortexintheoppositedirectionduetothehigh-speedturborotation,makingtheflowsteadier,thusimprovingboththegradeefficiencyandprecisionoftheturboclassifier.Thisresearchprovidespositivetheoreticalevidencesfordesigningsub-micronparticleclassifierswithhighefficiencyandaccuracy.