学科分类
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258 个结果
  • 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。

  • 标签: 离散元素建模 微粒破碎 双曲弹性模型 颗粒学
  • 简介:ParticlebasedmodelsofcompositeanodesareusefultoolsforexploringthebehaviorofSOFCsystems.Aspartofoureffortstodevelopmodelsforunderstandingfuelcells,wehavebeenbuildingmodelsofNi-YSZcompositeanodesusingexperimentallymeasuredparticlesizedistributions.Theobjectivesofthisstudyweretocharacterizethepercolationthresholdandconductivityofthesemodelsincomparisontosimplermonodispersedandbiphasicparticlesizedistributionsfromtheliterature.Wefoundthattheaveragevaluesfortheonsetofpercolationandthemeasuredconductivityofthemodelswithexperimentallymeasuredparticlesizedistributionsaresimilartothoseforthesimpledistributionsandtheexperimentallymeasureddistributions.Foralloftheconfigurationsevaluated,theonsetofpercolationintheNickelphaseoccurredatasolidfractionofNickelbetween20%and25%.ThiscorrespondedalmostexactlytothepointatwhichthecoordinationnumberbetweenNickelphaseparticlesreached2.2.Thesignificantfindingwasthatthevariationinthevaluefortheconductivity,asmeasuredbythestandarddeviationoftheresults,wasseveralordersofmagnitudehigherthanforthesimplersystems.Weexploredthevalidityofourassumptions,specificallytheassumptionofrandomparticleplacement,bybuildingaparticlemodeldirectlyfromFIB-SEMdata.Inthisreconstruction,itwasclearthatthelocationofparticleswasnotrandom.Particlesofthesametypeandsizehadmuchlikelihoodofcontacthigherthanwouldindicatedbyrandomlocation.

  • 标签: 颗粒粒径分布 电池模型 复合阳极 燃料电池系统 固体氧化物 粒子模型
  • 简介:Rareearthuhrafineparticlehasbeenpaidagreatattentiontoinrecentyearsaroundtheworldbecauseofitsincreasingapplicationsinfunctionalmaterials.Preciseceramicsisatypicalexample.Thepartiealsizesfortheproductnowavailableareusuallyintherangeof100-1000(1=1010m)withlargespecificsurface,say,70—120m2/g.Ultrafinepowdersareusuallyclassifiedinto3gradesdependingontheirpar-ticlesizes,thusthefirstbeingintherangeof10—

  • 标签: POWDERS SIZES ceramics finer classified NARROW
  • 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

  • 标签: 颗粒法 复合流体 化学工艺 多尺度结构 伪颗粒逼近 分子力学
  • 简介:AnExtendedParticleSwarmOptimizer(EPSO)isproposedinthispaper.Inthisnewalgorithm,notonlythelocalbutalsotheglobalbestpositionwillimpacttheparticle'svelocityupdatingprocess.EPSOisanintegrationofLocalBestparadigm(LBEST)andGlobalBestparadigm(GBEST)anditsignificantlyenhancestheperformanceoftheconventionalparticleswarmoptimizers.TheexperimentresultshaveprovedthatEPSOdeservestobeinvestigated.

  • 标签: 集群优化 模拟生物智能算法 进化计算 EPSO
  • 简介:Twoschemesforteleportinganunknownone-particlestateareproposedwhenageneralWstateisutilizedasquantumchannel.Inthefirstscheme,afterthesender(Alice)makesaBell-statemeasurementonherparticles,therecipient(Bob)performsaVonNeumannmeasurementandintroducesanauxiliaryparticle,andcarriesoutaunitarytransformationonhisparticleandtheauxiliaryparticle,andperformsaVonNeumannmeasurementontheauxiliaryparticletoconfirmwhethertheteleportationsucceedsornot.Inthesecondscheme,therecipient(Bob)doesnotneedtoperformthefirstVonNeumannmeasurementorintroducetheauxiliaryparticle,whichisnecessaryinthefirstscheme.Itisshownthatthemaximalprobabilitiesofsuccessfulteleportationofthetwoschemesareidenticaliftherecipient(Bob)performsanappropriateunitarytransformationandadoptsaproperparticleonwhichherecoversthequantuminformationofstatetobeteleported.

  • 标签: 未知单粒子态 概率隐形传态 三粒子纠缠 一般W态
  • 简介:ThisreportgivesabriefintroductiontokeyThaiorganizations,includingresearchinstitutionsandacademicdepartments,activeinparticletechnology.ThisisfollowedbyadescriptionofthelatesttrendofpowdertechnologyandnanoparticletechnologyinThailand.

  • 标签: PARTICLE TECHNOLOGY NANOPARTICLES R&D Thailand
  • 简介:AsaresultofdiscussionswithintheHEPcommunity,wehavewrittenaC++packagewhichcanbeusedtomaintainatableofparticleproperties,includingdecaymodeinformation.Theclassesallowformultipletablesandacceptinpufromanumberofstandardsources,Inaddition,Theyprovideamechanismbywhichaneventgeneratorcanemploythetabulatedinformationtoactuallydirectthedecayofparticles.

  • 标签: HepPDT 粒子数据表 高能物理
  • 简介:TheD0experiment'sdataandjobmanagementsystemsoftware,SAM,isanoperationalprototypeofmanyoftheconceptsbeingdevelopedforGridcomputing.WeexplainhowthecomponentsofSAMmapintotheDataGridarchitecture,WediscussthefutureuseofGridcomponentstoeitherreplaceexistingcomponentsofSAMortoextenditsfunctionalityandutility.owrkbeingcarriedoutaspartoftheParticlePhysicsDataGrid(PPDG)project.

  • 标签: 粒子物理学 数据网格 SAM
  • 简介:在远距传物,成功的概率被艾莉斯的测量和量隧道决定,这能被看见。如果爱丽斯的测量是适当的,远距传物能成功地与最大的概率被认识到。根据转变操作员,二个计划经由一个一般W状态,成功的概率和两个计划的忠实通过到达1为一个未知一个粒子状态的远距传物被建议。而且,直角的完全的测量底的二根最佳的火柴为teleporting被给一个未知一个粒子状态。

  • 标签: 正交完全测量基础 量子信息 隐形传输 量子通道
  • 简介:RelativeEnergyCalibrationforMeasurementofParticleCorrelations¥DuanLimin;LiZuyu;JinGenming;HeZhiyong;LuoQingzheng;WuHey...

  • 标签: 瑁?
  • 简介:ThecommissioningofseverallargeinstallationsofAPEmillecomputersinEuropewillhavebeenfinishedinautumn2001,Allthesemachinestogethermakeanother2Tflopsofcomputingpoweravailablefornumericalsimulationsintheoreticalparticlephysics.

  • 标签: 粒子物理学 规范理论 并行计算
  • 简介:Thispapercontributestoextractinginformationfromsignalsofbroadbandultrasonicattenuationspectrumforeffectiveutilizationinparticlesizecharacterization.Thesingleparticlescatteringmodelandthecoupled-phasemodelareformulatedsimultaneously,therelationshipbetweenparticlesizedistributionandultrasonicspectrumisestablished,andaconvergencecriterionforcalculationisquantified.Demonstrationinversionbytheoptimumregularizationfactormethodiscarriedouttoyieldtypicalnumericalresultsfordiscussion.Withtheexperimentalset-updevelopedbytheInstituteofParticleandTwo-PhaseFlowMeasurement(IPTFM)attheUniversityofShanghaiforScienceandTechnology,sandsedimentparticlesizeismeasuredbyattenuationspectrumandanalyzedusingtheaboveinversionalgorithmandtheoreticalmodels.Tovalidatetheproposedultrasonicspectrumparticlesizingmethod,resultsarecomparedwiththoseobtainedbymicroscopy.

  • 标签: ULTRASONIC SPECTRUM PARTICLE SIZE INVERSION
  • 简介:Thisreviewcoverstheprogressoflightscatteringapplicationsinthefieldofparticlecharacterizationinthepastdecade.Thereviewaddressesstaticlightscattering(themeasurementofscatteringintensitiesduetolight-particleinteractionatvariousspatiallocations),dynamiclightscattering(themeasurementofscatteringduetolight-particleinteractionasafunctionoftime),andscatteringtrackinganalysis(thetrackingofparticlemovementthroughscatteringmeasurement).

  • 标签: 静态光散射 应用 表征 颗粒 粒子相互作用 综述
  • 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。

  • 标签: 居住环境 光线散射 动力效应模型 研究
  • 简介:Researchontheflowfieldinsideaturboclassifieriscomplicatedthoughimportant.Accordingtothestochastictrajectorymodelofparticlesingas-solidtwo-phaseflow,andadoptingthePHOENICScode,numericalsimulationiscarriedoutontheflowfield,includingparticletrajectory,intheinnercavityofaturboclassifier,usingbothstraightandbackwardcrookedelbowblades.Computationresultsshowthatwhenthebackwardcrookedelbowbladesareused,themixedstreamthatpassesthroughthetwobladesproducesavortexinthepositivedirectionwhichcounteractstheattachedvortexintheoppositedirectionduetothehigh-speedturborotation,makingtheflowsteadier,thusimprovingboththegradeefficiencyandprecisionoftheturboclassifier.Thisresearchprovidespositivetheoreticalevidencesfordesigningsub-micronparticleclassifierswithhighefficiencyandaccuracy.

  • 标签: 数字模拟 粒子运动 涡轮 粒子轨道 随机模型