学科分类
/ 25
500 个结果
  • 简介:Weinvestigatethedynamicsoftwointeractionelectronsconfinedtoone-dimensionalquantumdotarrayinanacelectricfield.Wefindthatinitiallylocalizedelectronswillremainlocalizedintheabsenceofcoulombinteractioniftheratiooftheacfieldmagnitudetothefrequencyisarootoftheordinaryzero-orderBesselfunction.IncontrasttothecasewithoutCoulombinteraction,nomatterwhatthevalueis,theelectronsaredelocalizedandthedelocalizationeffectdependsontheratioU/ωandeaE/ω,whereUisthestrengthofCoulombinteraction,aisthelatticeconstant,andEandωaretheacfieldamplitudeandfrequency,respectively.

  • 标签: 半导体 半导体微结构 一维量子斑点阵列
  • 简介:Basedonthevariationaltheory,awavelet-basednumericalmethodisdevelopedtocalculatethedefectstatesofacousticwavesintwo-dimensionalphononiccrystalswithpointandlinedefects.Thesupercelltechniqueisapplied.Byexpandingthedisplacementfieldandthematerialconstants(massdensityandelasticstiffness)inperiodicwavelets,theexplicitformula-tionsofaneigenvalueproblemfortheplaneharmonicbulkwavesinsuchaphononicstructurearederived.Thepointandlinedefectstatesinsolid-liquidandsolid-solidsystemsarecalcu-lated.Comparisonsofthepresentresultswiththosemeasuredexperimentallyorthosefromtheplanewaveexpansionmethodshowthatthepresentmethodcanyieldaccurateresultswithfasterconvergenceandlesscomputingtime.

  • 标签: 声波 声子晶体 缺陷构造 子波 波段结构
  • 简介:1.ObjectivesAsabout99%ofthenaturalgashydrate(NGH)resourcesarestoredontheseafloor,itisinevitablethatinitsprocessofexplorationandproduction,therewillbegeohazardssuchasmethaneleakage,seabedsubsidence,ecosystemdamageandevenlandslide.Therefore,asetofintegratedsystemsforenvironmentalmonitoringintheprocessofNGHproductionhasbeenproposedintheconsiderationofenvironmentaldisastersthatmayariseintheprocessofhydrateproduction.

  • 标签: THREE-DIMENSIONAL MONITORING SYSTEM HYDRATES
  • 简介:我们学习二维(2D)在吝啬地的模型的事波浪solitons在2D空间与远程的quadrupolequadrupole相互作用(QQI)由电的四极粒子形成了。在空间的2D事波浪solitons的存在用2DGrossPitaevskii方程(GPE)被预言。我们发现QQIsolitons比dipoledipole相互作用(DDI)有一个更高的团(更小的尺寸和更高的紧张)和更强壮的anisotropy在一样的环境参数下面的solitons。在在2D空间的二相同QQIsolitons之间的各向异性的solitonsoliton相互作用被学习。而且,稳定的各向异性的偶极子solitons被观察到我们的知识,第一次在在各向异性的非局部的立方的非线性下面的2D空间。

  • 标签: 二维空间 物质波 GROSS-PITAEVSKII方程 电四极 孤子 偶极相互作用
  • 简介:Thediffusionbehaviordrivenbyboundednoiseundertheinfluenceofacoupledharmonicpotentialisinvestigatedinatwo-dimensionalcoupled-dampedmodel.WiththehelpoftheLaplaceanalysisweobtainexactdescriptionsforaparticle’stwo-timedynamicswhichissubjectedtoacoupledharmonicpotentialandacoupleddamping.Thetimelagisusedtodescribethevelocityautocorrelationfunctionandmeansquaredisplacementofthediffusingparticle.Thediffusionbehaviorforthetimelagisalsodiscussedwithrespecttothecoupleditemsandtheamplitudeofboundednoise.

  • 标签: 耦合谐振 有界噪声 扩散行为 存储器系统 二维 时间滞后
  • 简介:Thebasicmathematicmodels,suchasthestatisticmodel,thetime-serialmodel,thespatialdynamicmodeletc.,andsometypicalanalysismethodsbasedon3DCMareproposedanddiscussed.Afewtypicalspatialdecisionmakingmethodsintegratingthespatialanalysisandthebasicmathematicalmodelsarealsointroduced,e.g.Visualimpactassessment,dispersionofnoiseimmissions,basestationplanforwirelesscommunication.Inaddition,anewideaofexpectationoffurtherapplicationsandadd-in-valueserviceof3DCMispromoted.Asanexample,thesunshineanalysisisstudiedandsomehelpfulconclusionsaredrawn.

  • 标签: 城市空间模型 数学模型 统计学 时间数列 GIS
  • 简介:Inthiswork,wereviewthedevelopingprogressoftwo-dimensionalterahertztime-domainspectroscopy(THz-TDS)anditsdiverseapplications,includinganalyzingthepolarizationofTHzradiationfromalaser-inducedplasmasourceandstudyingthecorrespondingphysicalmechanism,andcharacterizingtheopticalpropertiesofcrystals,etc.

  • 标签: 太赫兹时域光谱 应用 二维 光谱仪 太赫兹辐射 等离子体源
  • 简介:Multipleperformancerequirementsneedtobeguaranteedinsomereal-timeapplicationssuchasmultimediadataprocessingandreal-timesignalprocessinginadditiontotimingconstraints.Unfortunately,mostconventionalschedulingalgorithmsonlytakeoneortwodimensionsofthemintoaccount.Motivatedbythisfact,thispaperinvestigatestheproblemofprovidingmultipleperformanceguaranteesincludingtimeliness,QoS,throughput,QoSfairnessandloadbalancingforasetofindependenttasksbydynamicscheduling.Webuildaschedulermodelthatcanbeusedformulti-dimensionalscheduling.Basedontheschedulermodel,weproposeaheuristicmulti-dimensionalschedulingstrategy,MDSS,consistingofthreesteps.Thefirststepcanbeofanyexistingreal-timeschedulingalgorithmthatdeterminestoacceptorrejectatask.Instep2,weputforwardanovelalgorithmMQFQtoenhancetheQoSlevelsofacceptedtasks,andtomakethesetaskshavefairQoSlevelsatthesametime.AnothernewalgorithmITLBisproposedandusedinstep3.TheITLBalgorithmiscapableofbalancingloadandimprovingthroughputofthesystem.ToevaluatetheperformanceofMDSS,weperformextensivesimulationexperimentstocompareMDSSstrategywithMDSRstrategy,DASAPandDALAPalgorithms.ExperimentalresultsshowthatMDSSsignificantlyoutperformsMDSR,DASAPandDALAP.

  • 标签: 实时调度算法 异构集群 实时任务 多媒体数据处理 多维 实时信号处理
  • 简介:Localizedmodesinone-dimensional(1D)mediawithuniaxialscatterersthatareassumedtobeorderinspatiallocationbutdisorderinspatialorientationoftheiropticalaxisareinvestigated.Basedontheholisticeffectmodelinrandomlaser,i.e.,therandomlaserisduetotheinteractionofthecomplexlocalizedmodesinactiverandommediawithlocalaperiodicquasi-structurewithappropriatepumplight,aphysicalmodelonthistypeofrandommediaisfound.ItsdisorderdegreeisdefinedbyD=n_o/n_e.Then,thetypicaltransmissionspectrumthroughtherandommediaandthelightfieldintensitydistributioncorrespondingtothedefectmodesinphotonicband-gaparecalculatednumericallybymeansofthetransfermatrixmethod,andtheconditionthatthelocalizedmodeappearsisdiscussed.Resultsshowthatthemediumdisorderplaysanimportantroleindeterminingthelightwavestate.Thelocalizedstateappearswhenthemediumdisorderisstrongenough,andanewmechanismcreatingrandomlaserphenomenonisbroughtforward.

  • 标签: 单轴散射物质 局部模式 一维介质 光轴
  • 简介:Aturbulentseparation-rcattachmentflowinatwo-dimensionalasymmetricalcurved-walldiffuserisstudiedbyatwo-dimensionallaserdopplervelocimeter.Theturbulentboundarylayerseparatesonthelowercurvedwallunderstrongpressuregradientandthenreattachesonaparallelchannel.Attheinletofthediffuser,Reynoldsnumberbasedonthediffuserheightis1.2×10~5andthevelocityis25.2m/s.There-sultsofexperimentsarepresentedandanalyzedinnewdefinedstreamline-alignedcoordinates.TheexperimentshowsthatafterTransitoryDetachmentReynoldsshearstressisnegativeinthenear-wallbackflowregion.TheircharacteristicsareapproximatelythesameasinsimpleturbulentshearlayersnearthemaximumReynoldsshearstress.AscaleisformedusingthemaximumReynoldsshearstresses.ItisfoundthataReynoldsshearstresssimilarityexistsfromseparationtoreattachmentandtheSchofield-Perryvelocitylawex-istsintheforwardshearflow.Bothprofilesareusedintheexperimentalworkthatleadstothedesignofaneweddy-viscositymodel.ThelengthscaleistakenfromthatdevelopedbySchofieldandPerry.ThecompositevelocityscaleisformedbythemaximumReynoldsshearstressandtheSchofieldPerryvelocityscaleaswellastheedgevelocityoftheboundarylayer.Theresultsoftheseexperimentsarepresentedinthispaper

  • 标签: SEPARATING FLOW boundary layer TURBULENT FLOW
  • 简介:ThediscreteSobolev’sinequalitiesinL_pnormareprovedforthree-dimensionalsphericalandcylindricalcoordinates,byusingdiscreteHolderinequality.propertyofthetrianglefunctionsandcomplicateddeduction.

  • 标签: COORDINATES INEQUALITY TRIANGLE SPHERICAL HOLDER milar
  • 简介:基于测量系统的3DPTV(追踪Velocimetry的粒子),有四条不同直径的粒子的3D运动特征被调查。在特定的流动条件下面,粒子的3D运动上的粒子直径的影响被学习,并且骚乱特征被不同统计方法分析。当直径增加了,结果证明粗糙的粒子的骚乱紧张减少了。在近的墙区域,纵、垂直的变化速度的概率密度分布两个都从正常分发背离了;当时在外部区域,垂直变化速度的概率密度分发近似同意了正常分发。

  • 标签: 三维运动 粒子跟踪 湍流特性 粒径 概率密度分布 试验
  • 简介:Liquidinjection,andfilmformationandtransportindense-phasegas-solidsfluidizedbedsarenumericallysimulatedinthreedimensionsusingacollisionalexchangemodelthatisbasedonthemechanismthatcollisionscausetransferofliquidmass,momentum,andenergybetweenparticles.Inthemodel,eachoftheparticlesisrepresentedbyasolidcoreandaliquidfilmsurroundingthecore.ThemodelisincorporatedintheframeworkofthecommercialcodeBarracuda?developedbyCPFDSoftware.ThecommercialsoftwareisanadvancedCFD-basedcomputationaltoolwheretheparticlesaretreatedasdiscreteentities,calculatedbytheMP-PICmethod,andtrackedusingtheLagrangianmethod.DetailsofthecollisionalliquidtransfermodelhavebeenpreviouslypresentedinO'Rourke,Zhao,andSnider(2009);thispaperpresentsnewcapabilitiesandproof-testingofthecollisionmodelandanewmethodtobetterquantifythepenetrationlength.Examplecalculationsofafluidizedbedwithoutliquidinjectionshowtheexpectedeffectofcollisionsonthereductionofgranulartemperature(fluctuationalkineticenergy)ofthebed.Whenappliedtoliquidinjectionintoadense-phasefluidizedbedunderdifferentconditions,themodelpredictsliquidpenetrationlengthscomparabletotheexperiments.Inaddition,thesimulationrevealsforthefirsttimethedynamicmixingoftheliquiddropletswiththebedparticlesandthetransientdistributionofthedropletsinsidethebed.

  • 标签: 三维模拟 注射液 流化床 液膜 运输 碰撞转移
  • 简介:Thispaperconsidersamulti-agenttrackingproblemforahigh-dimensionalactiveleaderandvariableinterconnectiontopology.Thestateoftheleadernotonlykeepschangingbutalsomaynotbemeasured.Toestimatethestatesuchaleaderindividually,aneighbor-basedlocalcontrollertogetherwithaneighbor-basedstate-estimationruleisgivenforeachautonomousagent.Then,theauthorsprovethat,withthehelpofaconstructedcommonLyapunovfunction(CLF),eachagentcantracktheactiveleaderwithunmeasurablestates.Finally,theauthorsexplicitlyconstructaCLFforanactiveleaderwithunknownperiodicinputforillustration.

  • 标签: 跟踪问题 多Agent 共同LYAPUNOV函数 拓扑 高维 开关
  • 简介:有温度分发上的放射效果的三维的Couette流动的理论分析被分析了,当在更低的静止的板的液体的注射是一条横向的正弦曲线时一个;它由通过上面的多孔的板的经常的吸的相应移动在一致运动。由于这类注射速度,流动变得三维。Prandtl数字的效果,放射参数;热转移的率上的注射参数被图的帮助检验了。Prandtl数字比注射或放射参数在温度分发上有大得多的效果。

  • 标签: 三维库爱特流动 温度分布 不可压缩流 传热 辐射效应 注入
  • 简介:Inthispaper,aprimitiveequationlinearwavemodelisusedtoexaminetheeffectsofthree-dimen-sionalstructureofheatingfieldonthebehaviorofstationaryplanetarywavesinsummerandtocomparetherolesofdifferentheatingfunctionsfortheformationandmaintenanceofsummermonsooncirculationinAsia.Itisshownthatthealoftheatingconnectedwiththelatentheating,especiallythedeepcondensationheatingassociatedwiththecumulusconvectioninlowlatitudes,playsacrucialpartintheAsiansummermon-soonandthestructuresofplanetarywaveresponsesarequitesensitivetotheverticaldistributionofheating.

  • 标签: HEATING LATENT PLANETARY MONSOON stationary maintenance
  • 简介:瞄准:为了检验因素,用一个最近确定的在试管内模型在肠的巨噬细胞(IMAC)的区别包含了。方法:测试是否可溶或膜界限因素induceIMAC区别,刚,elutriated单核白血球(瞬间)与肠的上皮细胞(IEC)的调节媒介或细胞膜被孵化或与在transwell系统的IEC有教养。决定瞬间的活跃迁居的重要性,从瞬间和IEC的1:1混合的三维的总数被免疫组织化学和流动血细胞计数检验。Apoptosis被caspase-3检验西方的污点。在区别模型的细胞外的矩阵生产被免疫组织化学比较。结果:IMAC区别在一个复杂三维的合作文化模型被观察(多细胞的球状体,MCS)与在进球状体的瞬间的移植以后的IEC。由有调节媒介或IEC的膜准备的瞬间的合作文化,没有IMAC区别被导致。有在transwell文化的IEC的瞬间的合作文化,与二个房间,膜也分开的人口没导致瞬间的象肠一样区别。与有在IEC和瞬间的混合MCS入境瞬间的IEC球状体相对照,瞬间的一张仅仅小潜水艇人口能熬过七个天文化时期。结论:瞬间在试管内的象肠一样区别仅仅在三维的MCS在在IMAC的区别期间显示房间矩阵或房间房间相互作用的一个角色的瞬间的移民以后建模的建筑群被导致。

  • 标签: 发病因素 细胞分化 肠疾病 巨噬细胞