简介:Thecomplexbandstructuresofa1Danisotropicgraphenephotoniccrystalareinvestigated,andthedispersionrelationsareconfirmedusingthetransfermatrixmethodandsimulationofcommercialsoftware.Itisfoundthattheresultofusingeffectivemediumtheorycanfitthederiveddispersioncurvesinthelowwavevector.Transmission,absorption,andreflectionatobliqueincidentanglesarestudiedforthestructure,respectively.Omni-gapsexistforanglesashighas80°fortwopolarizations.Physicalmechanismsofthetunabledispersionandtransmissionareexplainedbythepermittivityofgrapheneandtheeffectivepermittivityofthemultilayerstructure.
简介:<正>AneffectiverelativisticcontinuummassiveProcaLagrangianactionisusedtoaccountfortheLorentzvectorcondensationeffectsontheequationofstateofthestronglyinteractingfermionssystem.TheinteriorquantumfluctuationeffectsareincorporatedasanexternalfieldapproximationindirectlythroughafictivegeneralizedThomsonProblemcountertermbackground.Thegeneralanalyticalformulasforthed-dimensionalthermodynamicsaregivenneartheunitarylimitregion,Inthenon-relativisticlimitford=3,theuniversaldimensionlesscoefficientε=4/9andenergygap△/ε_f=5/18arereasonablyconsistentwiththeexistingtheoreticalandexperimentalresults.Intheunitarylimitford=2andT=0,theuniversalcoefficientcanevenapproachtheextremeoccasionξ=0correspondingtotheinfiniteeffectivefermionmassm~*=∞,whichcanbemappedtothestronglycoupledtwo-dimensionalelectronsandisquitesimilartothethree-dimensionalBose-Einsteincondensationofidealbosongas.Instead,ford=1,theuniversalcoefficientξisnegative,implyingthenon-existenceofphasetransitionfromsuperfluiditytonormalstate.ThesolutionsmanifestthequantumIsinguniversalclasscharacteristicofthestronglycoupledunitaryfermionsgas.
简介:IGUANA(InteractiveGraphicsforUserANAlysis)isaC++toolkitfordevelopinggraphicaluserinterfacesandhighperformance2-Dand3-Dgraphicsapplications,suchasdatabrowsersanddetectorandeventvisualisationprograms.TheIGUANAstrategyistousefreelyavailablesoftware(e.g.Qt,SoQt,OpenInventor,OpenGL,HEPVis)andpackageandextendittoprovideageneral-purposeandexperiment-independenttoolkit.WedescribetheevaluationandchoicesofpubliclyavailableGUI/graphicssoftwareandtheadditionalfunctionalitycurrentlyprovidedbyIGUANA.WedemonstratetheuseofIGUANAwithseveralapplicationsbuiltforCMSandD0.
简介:Inthispaper,wepresentanovelSupportVectorMachineactivelearningalgorithmforeffective3Dmodelretrievalusingtheconceptofrelevancefeedback.Theproposedmethodlearnsfromthemostinformativeobjectswhicharemarkedbytheuser,andthencreatesaboundaryseparatingtherelevantmodelsfromirrelevantones.Whatitneedsisonlyasmallnumberof3Dmodelslabelledbytheuser.Itcangrasptheuser'ssemanticknowledgerapidlyandaccurately.Experimentalresultsshowedthattheproposedalgorithmsignificantlyimprovestheretrievaleffectiveness.Comparedwithfourstate-of-the-artqueryrefinementschemesfor3Dmodelretrieval,itprovidessuperiorretrievalperformanceafternomorethantworoundsofrelevance
简介:Atopologymethodispresentedinthispapertorevealflowtructureoccurringinsieturbomachinery,inwhichnearwallflowstructureisrevealedbyusingwalllimitingstreamilinesandspaceflowfeatureisrevealedbyusingspacestreamilinesandcross-sectionstreamlines,Asanexample,acomputationalthree-dimensionalviscousflowfieldinsideatransonicturbinecascadeisstudied.Throughtheanalysis,theformandevolutionofvortexsystemandthewholeprocessofseparationoccurringwithinthiscascadearerevealed.Theapplicationoftopologymethodforanalyzeflowstructureinsideturbomachinmeryisveryimportantforunderstandingflowfeaturesandmechanismofflowlossevenforimprovingthedesignofturbomachineryandincreasingitsefficiency.
简介:Wepropose,inthispaper,touseseveralmultivariateanalysismethodeandanewkindofvariablestoseparatebetweenfourclassesofeventsproducedatLEP2:theeventswith2jets,3jets,4jetsandthosehavingamoreabundantjettopology(njets,n>4)Neuralnetworkhaveproventhemselvestobemoreefficientclassifierthantheothertechniques.Theefficienciesandpuritiesachievedwiththeoptimizedneuralnetworkareinaverage1to7%higherthanthoseobtaindwiththeothermethods.
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简介:现在的纸为与快速的3D片和格子生成器(RAPID3DGRID)相结合的turbomachinery的空气动力学的设计描述优化方法论,一个N.S解答者,一个片parameterization方法(BPM),一个基于坡度的analyseparameterization方法(GPAM),有激增的一个反应表面方法(RSM)算法和一个简单坡度方法。由片parameterization方法的使用,一个接近音速的压缩机转子能被一套多项式表示,然后它使我们能转变表示坐标的片数据到表示参数然后减少参数的数字。与改变任何一个参数,我们能获得几组样品。这里,仅仅十个参数被认为寻找一个优化压缩机转子。由于优化,断热的效率被1.73%增加。
简介:在多孔的媒介和液体之间的热和集体转移是一个复杂联合过程,它广泛地在设计应用的各种各样的地里被使用,特别为在油和煤气的抽取的自然、人工的破裂。在这研究,一个新方法被建议在破裂处理流动和稳定的流动的热转移问题。在破裂的液体流动用象Mohais的一样的方法被描述,与多孔的墙,和不安方法把破裂看作了一条隧道的人,被用来解决数学模型。不同于以前的研究,shear跳Ochoa-Tapia和Whitaker建议的边界状况在在液体和多孔的媒介之间的接口被使用。主要方法是不安分析和申请砍跳边界条件。渗透的影响,隧道宽度,砍跳在隧道的流动和热转移上的度和有效动态粘性被分析分析答案学习。在有典型参数和热转移的敏感的变化的隧道的轴的速度的分发被获得。
简介:Theshiftinthepercolationthresholdofcompressedcompositeswasstudiedbya3Dcontinuumpercolationmodel.AMonteCarlo(MC)methodwasemployedinthesimulations.Thepercolationthresholdwasfoundtorisewiththecompressionstrain,whichcapturesthebasictrendincompression-inducedconductivityvariationfromtheexperiments.Bothfiberbendingandtextureformationcontributetothepercolationthreshold.Theresultssuggestthatfillerswithahighaspectratioaremoredesirableforsensorandelectricalswitchapplications.
简介:The3-Dturbulentgas-particleflowsinaninnovativecombustorcalled“Spouting-CycloneCombustor”aresimulatedusingak-ε-Aptwo-phaseturbulencemodel.Theresultsshowthat:(1)THepredictedresultsinthespoutingzoneareingoodagreementwiththeexperimentalones;thepredictedgasflowfieldinthecyclonezoneisneartothatmeasured;(2)Inthespoutingzone,thereisalarge-sizegasparticlerecirculationzoneandasmall-sizeoneinthex-rplane,whichisfavorabletoburningcoarsecoalparticles;Inalmosteveryr-θplane,thereareseveralgas-particlevortices,whichisbeneficialtothemixing,heatandmasstransferbetweentwophases,thus,tothetwo-phasecombustion.(3)Thereisremarkablevelocityslipbetweengasandparticlephases;(4)Inthecyclonezone,predictionsshowtheoccurrenceofrecirculatingsecondaryflowsandcounterswirlingflowsinsomecrosssections,suchphenomenaaredifficulttobeobservedbyexperimentalmethods.
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简介:Thenonstaggeredgridsareadoptedinthispaperforsolvingthegoverningequationsofflowsinthecurvilinearcoordinatesystems.Thepresentpaperdemonstratesthebasicreasonandcorrespondingeliminatingmethodforthepressureoscillation,anddeducesthecorrectedexpressionsforthecurvilinearvelocitycomponentsinwhichandadditionaltermrepresentingthedifferencebetweenthe1-δand2-δdifferencevaluesforthepressuregradientappears.Thusifanoscillatorypressurefiledwerearisen,themagnitudeofthistermwouldbelargeandwouldacttoremovetheoscillation;whereasfornonoscillatoryfieldthemagnitudeofthistermremainssmall.Asexaminationforthenumericalmethod3-Dturbulentflowinasquareductwith90°bendand3-Dturbulentmixinglowinalobed-mixerwerecalculatiedrespectively.Thenumericalresultsaresatisfactory.
简介:Basedonconsolidationequationsproposedforunsaturatedsoil,ananalyticalsolutionfor1Dconsolidationofanunsaturatedsingle-layersoilwithnonhomogeneousmixedboundaryconditionisdeveloped.Themixedboundaryconditioncanbeusedforspecialapplications,suchastestsoccurinlaboratory.Theanalyticalsolutionisobtainedbyassumingallmaterialparametersremainconstantduringconsolidation.Inthederivationoftheanalyticalsolution,thenonhomogeneousboundaryconditionisfirsttransformedintoahomogeneousboundarycondition.Then,theeigenfunctionandeigenvaluearederivedaccordingtotheconsolidationequationsandthenewboundarycondition.Finally,usingthemethodofundeterminedcoefficientsandtheorthogonalrelationoftheeigenfunction,theanalyticalsolutionforthenewboundaryconditionisobtained.Thepresentmethodisapplicabletovarioustypesofboundaryconditions.Severalnumericalexamplesareprovidedtoinvestigatetheconsolidationbehaviorofanunsaturatedsingle-layersoilwithmixedboundarycondition.