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51 个结果
  • 简介:Thehumancardiovascularsystemisaclosedloopandcomplexvascularnetworkwithmulti-scaledheterogeneoushemodynamicphenomena.Here,wegiveaselectivereviewofrecentprogressinmacro-hemodynamicmodeling,withafocusongeometricalmulti-scalemodelingofthevascularnetwork,micro-hemodynamicmodelingofmicrocirculation,aswellasbloodcellular,subcellular,endothelialbiomechanics,andtheirinteractionwitharterialvesselmechanics.Wedescribeindetailthemethodologyofhemodynamicmodelinganditspotentialapplicationsincardiovascularresearchandclinicalpractice.Inaddition,wepresentmajortopicsforfuturestudy:recentprogressofpatient-specifihemodynamicmodelinginclinicalapplications,micro-hemodynamicmodelingincapillariesandbloodcells,andtheimportanceandpotentialofthemulti-scalehemodynamicmodeling.

  • 标签: 血流动力学 心血管系统 多尺度建模 动力学模型 临床应用 多尺度模型
  • 简介:Thisarticlepresentsanovelimageinterpolationbasedonrationalfractalfunction.Therationalfunctionhasasimpleandexplicitexpression.Atthesametime,thefractalinterpolationsurfacecanbedefinedbyproperparameters.Inthispaper,weusedthemethodof‘coveringblanket’combinedwithmulti-scaleanalysis;thethresholdisselectedbasedonthemulti-scaleanalysis.Selectingdifferentparametersintherationalfunctionmodel,thetextureregionsandsmoothregionsareinterpolatedbyrationalfractalinterpolationandrationalinterpolationrespectively.Experimentalresultsonbenchmarktestimagesdemonstratethattheproposedmethodachievesverycompetitiveperformancecomparedwiththestate-of-the-artinterpolationalgorithms,especiallyinimagedetailsandtexturefeatures.

  • 标签: 图像插值 多尺度分形维数 有理函数模型 多尺度分析 纹理特征 分形函数
  • 简介:地震照明在表面下的成像起一个重要作用。一幅更好的图象也能通过优化获得几何学或介绍包含照明赔偿的更先进的地震移植或tomographic倒置方法被期望。垂直电报调查是为它的灵活性和数据质量的传统的海洋的地震调查的潜在的代替。处理的常规垂直电缆线数据在移植前要求primaries和multiples的分离。我们建议使用多尺度的完整的波形倒置(FWI)改进垂直电报调查的照明范围。一个深水速度模型被造在在海床下面检测低速度异例测试多尺度的FWI的能力。合成结果证明多尺度的FWI是在深海的探索的一个有效模型大楼工具。通过面向的照明分析和多尺度的FWI可以帮助减轻垂直电报调查的风险的目标的几何学优化。多尺度的FWI,低频率的数据和multi-vertical-cable获得系统的联合可以提供高分辨率和高保真度表面下的模型。

  • 标签: 垂直电缆 反演方法 波形反演 多尺度 海上地震勘探 海洋
  • 简介:这份报纸在水分泌物的时间系列和黄河的沉积负担检验变化进Bohai海。为了决定突然的变化的特征和水的多尺度的时期,分泌物和沉积装载,从Lijin的数据车站被分析,并且回声时期当时是计算的。Mann-Kendall测试,聚类的顺序,力量光谱,和小浪分析被用来在最后62年观察水分泌物和沉积负担进海。在进海的水分泌物的最重要的突然的变化在1985发生了,并且在沉积负担的一个突然的变化发生在一样的年里。分别地,64.6%和73.8%的重要减少在1985前在水分泌物和沉积负担被观察。在水分泌物和沉积负担的更重要的突然的变化在1968和1996被观察。进Bohai海表演的水分泌物和沉积负担的特征在内部年度、十的规模的周期的摆动。而沉积负担的主要经期是10.67年,4.27年,和2.78年,水分泌物的主要经期是9.14年和3.05年。在水分泌物和沉积负担之间的重要回声时期在下列时间的规模被观察:2.86年,4.44年,和13.33年。水分泌物和沉积负担开始在1970以后减少并且自从1985,为几个原因显著地减少了。第一,黄河排水区域的降水后来减少了1970。第二,大规模人的活动例如水库和制约的大楼,增加了。第三,自从1985,水和土壤保存生效了。

  • 标签: 水流量 输沙量 多尺度 渤海 周期性振荡 变异
  • 简介:Theaimofthisstudyistodevelopdatacollectiontoolsforevaluationofschoolpracticecoursesandforperceptionsofteachercandidatesregardingteachercompetenciesforeffectiveteaching.Threehundredandeighty-eightlastyearundergraduatestudentsfromsevenprogramsoffacultiesofeducationattwostateuniversitiesparticipatedinthestudy.Itemsofthe5-pointLikertscalewerewrittenaccordingtothedimensionsoftheconstructswithrespecttotherelatedliterature.Theitemswerereviewedbythreeexperts,oneofwhomisintheeducationalmeasurementandtwoofwhomareinthescienceandbiologyeducationdepartments.Dimensionalitiesofthetwo-dimensionalEvaluationofPracticumScale(EPS)andone-dimensionalCompetencyofInstructionQualityScale(CIQS)wereanalyzedusingfactoranalysis.UnweightedleastsquaresestimationmethodandPromaxrotationwereusedinthefactoranalysisprocedures.Cronbach'sacoefficientswere0.89and0.83forthetwodimensionsofEPSand0.82forCIQS.

  • 标签: teaching quality TEACHER education intemship classes
  • 简介:Thepseudoexcitationmethod(PEM)hasbeenimprovedintoamorepracticalform,onwhichtheanalyticformulaeofseismicresponsepowerspectraldensity(PSD)ofsimplifiedlarge-spanstructuralmodelshavebeenderived.TheanalyticformulaeandnumericalcomputingresultsofseismicresponsePSDhavebeenderivedtostudythemechanismofmulti-supportexcitationeffects,suchasthewave-passageeffectandincoherenceeffect,fortheseismicresponseofmultiandlarge-spanstructures.Byusingamulti-spantrussasanexample,theinfluenceofmulti-supportexcitationeffectsontheseismicresponseofsuchstructuresisstudied.

  • 标签: RANDOM SEISMIC RESPONSE multi-support EXCITATIONS
  • 简介:DNAcondensationisanimportantprocessinmanyfieldsincludinglifesciences,polymerphysics,andappliedtechnology.Inthenucleus,DNAiscondensedintochromosomes.Inpolymerphysics,DNAistreatedasasemi-flexiblemoleculeandapolyelectrolyte.Manyagents,includingmulti-valentcations,surfactants,andneutralpoorsolvents,cancauseDNAcondensation,alsoreferredtoascoil–globuletransition.Moreover,DNAcondensationhasbeenusedforextractionandgenedeliveryinappliedtechnology.ManyphysicaltheorieshavebeenpresentedtoelucidatethemechanismunderlyingDNAcondensation,includingthecounterioncorrelationtheory,theelectrostaticzippertheory,andthehydrationforcetheory.Recentlyseveralsingle-moleculestudieshavefocusedonDNAcondensation,sheddingnewlightonoldconcepts.Inthisdocument,themulti-fieldconceptsandtheoriesrelatedtoDNAcondensationareintroducedandclarifiedaswellastheadvancesandconsiderationsofsingle-moleculeDNAcondensationexperimentsareintroduced.

  • 标签: 脱氧核糖核酸 阳离子表面活性剂 场方法 高分子物理 缩合机理 DNA
  • 简介:Themechanicalstructureaswellastheschematicorganizationhasbeendesignedtoachievelowerlimbrehabilitationtrainingfunction;Solidworkshasbeenusedtomodeltherobot.Andtherobothasbeenoptimizedbythemeansofhuman-interferenceengineering.TheprimarycomponentsoftherobothavebeenanalyzedbyAnsysworkbench.

  • 标签: 康复机器人 数字化设计 多功能 SolidWork WORKBENCH ANSYS
  • 简介:Atheoreticalinvestigationiscarriedouttostudytheexistence,formationandbasicpropertiesofionacoustic(IA)doublelayers(DLs)inamagnetizedbi-ionplasmaconsistingofwarm/coldionsandBoltzmanndistributedelectrons.Basedonthereductiveperturbationtechnique,anextendedKortewegde-Vries(KdV)equationisderived.Thepropagationoftwopossiblemodes(fastandslow),andtheirevolutionareinvestigated.Theeffectsofobhqueness,magnitudeofthemagneticfield,ionconcentration,polarityofions,andiontemperatureontheIADLprofileareanalyzed,andthentherangesofparametersforwhichtheIADLsexistareinvestigatedindetails.

  • 标签: ION ACOUSTIC WAVES bi-ion PLASMA DOUBLE-LAYERS
  • 简介:题目:中试台架上混煤结渣特性实验研究  目的:混煤掺烧方式广泛应用于电站的实际生产中,但实际生产中出现了比源煤更为严重的结渣情况。为了研究混煤结渣特性,本文在中试台架上进行混煤结渣实验。  创新点:在实验过程中采用CCD相机全程监控灰渣生长情况,通过对图片进行图像处理,可以获取灰渣的动态生长情况,更为详细地了解结渣特性。  方法:1.在中试台架上燃烧不同比例配制的大同煤和陕煤的混煤,插入结渣探针和CCD探针进行结渣实验;2.对煤灰进行X射线荧光(XRF)分析获取氧化物含量;3.对灰渣横截面进行扫描电子显微术-能量色散X射线分析(SEM-EDX),取不同层的粉末进行X射线衍射(XRD)分析。  结论:1.混煤结渣厚度随着陕煤比例的增加而增加;2.各工况下结渣达到稳态所需时间随着陕煤比例增加而增加;3.灰渣截面都出现了明显的分层情况,主要元素在飞灰和灰渣之间有明显的选择性沉积。

  • 标签: 混煤 灰沉积 结渣 CCD相机 矿物学
  • 简介:Simulationandrenderingoflarge-scalenaturalenvironments,especiallytheocean,hasalwaysbeenoneofthehotissuesincomputergraphics,whichcanproviderealismforvariousapplicationssuchascomputergame,movieandmilitaryusage.Simulationofoceanenvironmentisoftenlackofrealismforreal-timeapplicationduetoitscomplexityofdynamicwaves.Inthispaper,amethodbasedonFFTWavemodelisproposedtosolvethisproblem,whichcanalsosimulatetheoceanopticpropertywithatmospherescattering.Furthermore,ourmethodhasalotofadvantagesincludingglobaloceandatasetsupport,real-time,dynamicreflectionofocean,thefoamonthewave,smoothtransitionfromdeepoceantoseacoast,etc.Theexperimentalresultsdemonstratetherealismandeffectivenessofourapproach.

  • 标签: 海洋环境 实时绘制 计算机图形学 实时应用 计算机游戏 自然环境
  • 简介:Afamilyofarraycodeswithamaximumdistanceseparable(MDS)property,namedLcodes,isproposed.ThegreateststrengthofLcodesisthatthenumberofrows(columns)inadiskarraydoesnotberestrictedbytheprimenumber,andmorediskscanbedynamicallyappendedinarunningstoragesystem.Lcodescantolerateatleasttwodiskerasuresandsomesectorlosssimultaneously,andcantoleratemultiplediskerasures(greaterthanorequaltothree)underacertaincondition.BecauseonlyXORoperationsareneededintheprocessofencodinganddecoding,LcodeshaveveryhighcomputingefficiencywhichisroughlyequivalenttoXcodes.AnalysisshowsthatLcodesareparticularlysuitableforlarge-scalestoragesystems.

  • 标签: 磁盘阵列 存储系统 编码方案 最大距离可分码 计算效率 MDS
  • 简介:Smallconcentrationsofahigh-molecular-weightpolymerhavebeenusedtocreateso-called'elasticturbulence'inamicro-scaleserpentinechannelgeometry.Itisknownthattheinteractionoflargeelasticstressescreatedbytheshearingmotionwithinthefluidflowwithstreamlinecurvatureoftheserpentinegeometryleadsinitiallytoapurely-elasticinstabilityandthenthegenerationofelasticturbulence.Weshowthatthiselasticturbulenceenhancestheheattransferatthemicro-scaleinthisgeometrybyupto300%undercreepingflowconditionsincomparisontothatachievedbytheequivalentNewtonianfluidflow.

  • 标签: 弹性应力 强化传热 湍流 微尺度 微观尺度 流体流动
  • 简介:Inthispaper,wederivethebi-Hamiltonianstructureofamulti-componentCamassa–Holmsystem,whichassociateswiththemulti-componentAKNShierarchyandmulti-componentKNhierarchyviathetri-Hamiltoniandualitymethod.Furthermore,thespectralproblemsofthedualhierarchiesmaybeobtained.

  • 标签: bi-Hamiltonian STRUCTURE DUAL HIERARCHIES Camasssa
  • 简介:Thesingularboundarymethod(SBM)isarecentmeshlessboundarycollocationmethodthatremediestheperplexingdrawbackoffictitiousboundaryinthemethodoffundamentalsolutions(MFS).Thebasicideaistousetheoriginintensityfactortoeliminatesingularityofthefundamentalsolutionatsource.Themethodhassofarbeenappliedsuccessfullytothepotentialandelasticityproblems.However,theSBMsolutionforlarge-scaleproblemshasbeenhinderedbytheoperationcountofO(N~3)withdirectsolversorO(N~2)withiterativesolvers,aswellasthememoryrequirementofO(N~2).Inthisstudy,thefirstattemptwasmadetocombinethefastmultipolemethod(FMM)andtheSBMtosignificantlyreduceCPUtimeandmemoryrequirementbyonedegreeofmagnitude,namely,O(N).Basedonthecomplexvariablerepresentationoffundamentalsolutions,theFMM-SBMformulationsforbothdisplacementandtractionwerepresented.Numericalexampleswithuptohundredsofthousandsofunknownshavesuccessfullybeentestedonadesktopcomputer.TheseresultsclearlyillustratedthattheproposedFMM-SBMwasveryefficientandpromisinginsolvinglarge-scaleplaneelasticityproblems.

  • 标签: 下线 服务 迁移
  • 简介:Accordingtothestudyonseat-backcurvesaboutdifferentpeople,themethodthatusingtwoarc-shapedroofstogivebacksupportingforceofthehumanbodyisproposed.Throughacleverdesignapplicationofpiezoelectricsensor,microcontroller,motors,andarc-shapedroofsformaclosedloopcontrolsystem.Throughthedesignofhorizontalandverticaladjustmentmechanism,aflexibleandadaptivemulti-dimensionalbackcanreducetheharmtohumanspinewhichcausedbypoorpostureandsedentarylifestyle.ModelbuildingandstressanalysisaredonebyInventorsoftwaretoverifythemechanismofstrength.

  • 标签: 人机工程学 自适应 闭环控制系统 压电传感器 调节机制 生活方式
  • 简介:Theestablishmentofaglobalmulti-regionalcarbonmarketisconsideredtobeacosteffectiveapproachtofacilitateglobalemissionabatementandhasbeenwidelyconcerned.TheongoingplannedlinkagebetweentheEuropeanUnion’scarbonmarketandanewemissiontradingsysteminAustraliain2015wouldbeanimportantattempttothepracticeofbuildingupaninternationalcarbonmarketacrossdifferentregions.Tounderstandtheabatementeffectofsuchaglobalcarbonmarketandtostudyitsenergyandeconomicimpactondifferentmarketparticipants,thisarticleadoptsaglobaldynamiccomputablegeneralequilibriummodelwithadetailedrepresentationoftheinteractionsbetweenenergyandeconomicsystems.Ourmodelincludes20economicsectorsand19regions,anddescribesindetail17energytechnologies.Bundledwithfossilfuelconsumptions,theemissionpermitsareconsideredtobeessentialinputsineachoftheproductionandconsumptionactivitiesintheeconomicsystemtosimulateglobalcarbonmarketpolicies.Carbonemissionpermitsareendogenouslysetinthemodel,andcanbetradedbetweensectorsandregions.Consideringthecurrentdevelopmentoftheglobalcarbonmarket,thisstudytakes2020asthestudyperiod.Fourscenarios(referencescenario,independentcarbonmarketscenario,EuropeUnion(EUh-Australiascenario,andChina-EU-Australiascenario)aredesignedtoevaluatetheimpactoftheglobalcarbonmarketinvolvingChina,theEU,andAustralia.Wefindthatthecarbonpriceinthethreecountriesvariesalot,from$32/tCO2inAustralia,to$17.5/tCO2intheEU,andto$10/tCO2inChina.Thoughtherelativeemissionreduction(3%)inChinaislowerthanthatintheEU(9%)andAustralia(18%),theabsoluteemissionreductioninChinaisfargreaterthanthatintheEUandAustralia.WhenChinaisincludedinthecarbonmarket,whichalreadyincludestheEUandAustralia,theprevailingglobalcarbonpricefallsfrom$22pertoncarbondioxide(CO2

  • 标签: EMISSIONS TRADING system GLOBAL CARBON MARKET