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500 个结果
  • 简介:Unsaturatedradionuclidemigrationexperimentswereconductedinapitinsidethetestinghall.Severaltypesofradionuclideswereusedintheexperiments.Tritiumwasusedasatracerforwatermovementinunsaturatedloess.Otherkindsofradionuclideswerealsousedinordertoobtainfundamentalparametersforradionuclidemigrationsothatfurtherenvironmentalassessmentoflow—levelradioactivewastedisposalcanbecar-riedout.Mechanismsgoverningunsaturatedflowinloess,thatis,principlesofone—waylateralflow,arepresentedqualitativelyinthispaper.Andacontinuumone—dimensionalmodelforradionuclidemigrationtestingisdevelopedbasedontheex-perimentsconductedundertheparticularconditionsatthetestsite.Thedatameasuredfromthetestswerecomparedwithsolutionsofthisone—dimensionalmodel.Resultsshowthatthismodelisfeasibleformodelingradionuclidemigrationinunsaturatedloess.

  • 标签: RADIONUCLIDE MIGRATION the TRACER LAYER LOESS
  • 简介:AbstractPurpose:Secondary displacement represents a frequent complication of conservative treatment of fractures, particularly of the distal radius. The gap space between skin and cast may lead to a certain degree movements and this increased mobility might favor redisplacement. The aim of this study was to develop a new 3D method, to measure the gap space in all 3 geometrical planes, and to validate this new technique in a clinical setting of distal radius fractures.Methods:This study applies 3D imaging to measure the space between plaster and skin as a potential factor of secondary displacement and therefore the failure of conservative treatment. We developed and validated a new methodology to analyze and compare different forearm casts made of plaster of Paris and fiberglass. An unpaired t-test was performed to document differences between the investigated parameters between plaster of Paris and fiberglass casts. The significance level was set at p< 0.05.Results:In a series of 15 cases, we found the width of the gap space to average 4 mm, being slightly inferior on the radial side. Comparing the two different casting materials, plaster of Paris and fiberglass, we found a significantly larger variance of space under casts made of the first material (p=0.39). A roughness analysis showed also a markedly significantly higher irregularity of the undersurface of plaster of Paris as compared with fiberglass.Conclusion:This study allows for a better understanding of the nature of the "gap space" between cast and skin and will contribute to develop and improve new immobilization techniques and materials.

  • 标签: Forearm Wrist casts Radius fractures Conservative treatment Gap space
  • 简介:在这评论,我们在场拓扑的绝缘体(TI)和超导的nanowires和电影的一些最近的实验的一篇摘要。电子电子相互作用(EEI),弱反本地化(WAL)和效果由运输大小在拓扑的绝缘体电影发现了的各向异性的磁致电阻(AMR)被报导。然后,在非超导的nanowires的超导的电影,桥和nanowires和最近效果的运输性质被描述。最后,在拓扑的绝缘体和超导体(SC)之间的相互影响也被讨论。

  • 标签: 电子输运性质 超导薄膜 超导体 绝缘体 拓扑 低维
  • 简介:Thed-dimensionalclassicalHardyspacesHp(Td)areintroducedanditisshownthatthemaximaloperatoroftheRiemannsumsofadistributionisboundedfromHp(Td)toLp(T2)(d/(d+1)

  • 标签: 心气 外簇 日工 火石
  • 简介:Anewmethodformeasuring3-Drigidbodydisplacementsisproposed,inwhichtwoperpendicularbeamsareemittedontotwosensitiveplanesofPSDsleingperpendiculartoeachother.Themethodcanbeusedtomeasure1-Dor2-Ddisplacementswhenrequired.Moreover,theexperimentalresultsarepresented,whichdemonstratethatthenewmethodhashighaccuracy,fastprocessingspeed,highreliability,andeasilybeingrealized.

  • 标签: 显示测量 三维物体 光感测器
  • 简介:Avortexringimpingingonathree-dimensionalbumpisstudiedusinglargeeddysimulationforaReynoldsnumberRe=4×104basedontheinitialtranslationspeedanddiameterofthevortexring.Theeffectsofbumpheightonthevorticalflowphenomenaandtheunderlyingphysicalmechanismsareinvestigated.Basedontheanalysisoftheevolutionofvorticalstructures,twotypicalkindsofvorticalstructures,i.e.,thewrappingvorticesandthehair-pinvortices,areidentifiedandplayanimportantroleintheflowstateevolution.Thecirculationoftheprimaryvortexringreasonablyelucidatessometypicalphasesofflowevolution.Furthermore,themechanismofflowtransitionfromlaminartoturbulentstatehasbeenrevealedbasedonanalysisofturbulentkineticenergy.

  • 标签: 三维数值模拟 涡环 湍流动能 物理机制 大涡模拟 涡流现象
  • 简介:我们调查了之间的差别同温层(S类型)并且在intraseasonal时间的tropospheric(T类型)北极摆动(AO)事件可伸缩,以他们对表面空气温度的影响(坐)在北半球和与他们的空间结构联系的动态特征上。S类型AO事件证明一个平流层对流层联合了结构,当T类型事件展出了一个平流层对流层时解开的结构。在北半球上的环形的容纳的异例被发现与S类型AO事件被联系,而如此的一个环形的特征是实质地在T类型AO事件的destructed。在二种类型的对流层的不同水平结构能主要被归因于强迫的短暂旋涡反馈。至于Ttype事件的垂直地解开的结构,把他们区分开来与S类型事件的内在的动态特征在地带地限制的Rossby波浪的垂直繁殖躺着。在T类型事件,在一垂直波导存在的地方,地带地限制的Rossby波浪包能在东北亚洲上从重要高度异例发出,然后向上宣传进平流层。相反,如此的垂直繁殖不为S类型事件是明显的。在T类型事件从对流层与地带地限制的Rossby波浪的向上的注射联系的同温层的异例能进一步通过在climatological想PW和异常PW之间的干扰导致行星的波浪(PW)的异常垂直繁殖,导致最后的平流层对流层T类型事件的解开的结构。

  • 标签: 北极涛动 三维动态 ROSSBY波 垂直传播 耦合结构 类型
  • 简介:Wereviewtherecenttheoreticalstudyontheopticalpropertiesofone-dimensionalsoftphotoniccrystals(1DSPCs)withferrofluids.Theproposedstructureiscomposedofalternatingferrofluidlayersanddielectriclayers.Fortheferrofluid,singledomainferromagneticnanoparticlescanaligntoachainunderthestimuliofanexternalmagneticfield,thuschangingthemicrostructureofthesystem.Meanwhile,nonlinearopticalresponsesinferrofluidsarealsobrieflyreviewed.

  • 标签: SOFT PHOTONIC CRYSTALS ferrofiuids band gap
  • 简介:在这糊n维的流动(由连续时间的系统描述了)与静电干扰,分叉用频率领域形式主义与不同基本分叉的分类的目的被考虑。基于频率领域途径,我们为僵绳节点分叉证明一些标准,transcritical分叉;草耙分叉,;给一个例子说明获得的结果的效率。

  • 标签: 静态分歧 频域逼近 n维流程 连续时间系统
  • 简介:3-DS-waveQstructureinJiashiearthquakeregionisinvertedbasedontheattenuationofseismicwavesrecordedfromearthquakesinthisregionin1998bytheResearchCenterofExplorationGeophysics(RCEG),CSB,andaroughconfigurationofdeepcrustalfaultsintheearthquakeregionispresented.First,amplitudespectraofS-wavesareextractedfrom450carefully-chosenearthquakerecords,calledobservedamplitudespectra.Then,afterinstru-mentalandsiteeffectcorrection,theoreticalamplitudespectraaremadetofitobservedamplitudespectrawithnonlineardampedleast-squaresmethodtogettheobservedtraveltimeoverQ,providedthatearthquakesourcesconformtoBrune¢sdiskdislocationmodel.Finally,by3-Draytracingmethod,theoreticaltraveltimeoverQismadetofitobservedtraveltimeoverQwithnonlineardampedleast-squaresmethod.Inthecourseoffitting,thevelocitymodel,whichisobtainedby3-Dtraveltimetomography,remainsunchanged,whileonlyQmodelismodified.Whenfittingcametothegivenaccuracy,theultimateQmodelisobtained.TheresultshowsthatanNE-trendinglowQzoneexistsatthedepthsof10~18km,andanNW-trendinglowQzoneexistsatthedepthsof12~18km.TheseroughlycoincidewiththeNE-trendingandtheNW-trendinglowvelocityzonesrevealedbyotherscientists.ThedifferenceisthatthelowQzoneshaveawiderrangethanthelowvelocityzones.

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  • 简介:Aseriesofliquidcrystallinepolymerswithtwo-dimensionalmesogenicunitsweresynthesizedbysolutionpolycondensationatlowtemperature.Allthepolymerswereliquidcrystalline.ThemeltingtemperatureT_m(exceptthatwithsubstituentofmethoxy)andtheclearingtemperatureT_iofthepolymerschangeregularlywithvaryingofthelengthofthealkylsubstituentgroups.

  • 标签: Liquid CRYSTAL POLYMER TWO-DIMENSIONAL MESOGENIC unit
  • 简介:波长demultiplexer基于二维的photonic水晶波导被建议。由使用域(FDTD)方法和飞机挥动扩展(PWE)方法的有限差别时间,传播系列和模式地的分布被获得,并且波长demultiplexer被综合了。设备的特征被获得。

  • 标签: 波长 信号分离器 晶体 FDTD方法
  • 简介:Continentsubductionisoneofthehotresearchproblemsingeoscience.Newmodelspresentedherehavebeensetupandtwo-dimensionalnumericalmodelingresearchonthepossibilityofcontinentalsubductionhasbeenmadewiththefiniteelementsoftware,ANSYS,basedondocumentaryevidenceandreasonableassumptionsthatthesubductionofoceaniccrusthasoccurred,thesubductionofcontinentalcrustcantakeplaceandtheprocesscanbesimplifiedtoadiscontinuousplanestraintheorymodel.Themodelingresultsshowthatitiscompletelypossibleforcontinentalcrusttobesubductedtoadepthof120kmundercertaincircumstancesandconditions.Atthesametime,thesimulationsofcontinentalsubductionunderasingledynamicalfactorhavealsobeenmade,includingthepullforceofthesubductedoceaniclithosphere,thedragforceconnectedwithmantleconvectionandthepushforceofthemid-oceanridge.Theseexperimentsshowthatthedragforceconnectedwithmantleconvectioniscriticalforcontinentsubduction.

  • 标签: 大陆分裂 ANSYS 应用软件 动力装置模型 板块构造
  • 简介:AnewGraphicsProcessingUnit(GPU)parallelizationstrategyisproposedtoacceleratesparsefiniteelementcomputationforthreedimensionalelectromagneticanalysis.TheparallelizationstrategyisemployedbasedonanewcompressionformatcalledslicedELLFour(slicedELL-F).TheslicedELL-Fformat-basedparallelizationstrategyisdesignedforhasteningmanyaddition,dotproduct,andSparseMatrixVectorProduct(SMVP)operationsintheConjugateGradientNorm(CGN)calculationoffiniteelementequations.ThenewimplementationofSMVPonGPUsisevaluated.TheproposedstrategyexecutedonaGPUcanefficientlysolvesparsefiniteelementequations,espe-ciallywhentheequationsarehugesparse(sizeofmostrowsinacoefficientmatrixislessthan8).NumericalresultsshowtheslicedELL-Fformat-basedparallelizationstrategycanreachsigni?cantspeedupscomparedtoCompressedSparseRow(CSR)format.

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  • 简介:在这篇论文,我们为用模糊的熵识别相关潜水艇空格建议一个新奇方法并且表现聚类。这项措施由使用会员功能测量班火柴度更好区别真实分发。因此模糊的熵在潜水艇空格在模式的实际分发反映更多的信息。我们基于剪影标准使用一个启发式的过程发现簇的数字。介绍理论和算法通过许多基准数据集合的实验被评估。实验结果与几个另外的聚类的算法比较显示出它的有利表演。

  • 标签: 聚类算法 模糊熵 高维数据 分配格局 隶属函数 子空间
  • 简介:Inordertoovercomemanyproblemsandshortcomingsofourthree-dimensionaldesigneducationinmechanicaldrawing,makethestudentsmasterthemoderndesignmethodandtechnologyeasily,modernmodelingmethodandshapingmethodareintroduced,andtheshapingdesigningmethodsofassembled-bodyareanalyzedincludingbasicrequirementsforshapingdesign,commonprinciplesofshapingandshapingdesignmethod.Itwillbehelpfultoimprovethespatialimaginationandmodellingabilityofstudent.

  • 标签: 现代设计方法 建模方法 三维 空间想象能力 成形设计 设计教学
  • 简介:The(2+1)-dimensionalBKPequationintheHirotabilinearformisstudiedduringthiswork.WronskianandGrammiantechniquesareappliedtotheconstructionofWronskianandGrammiansolutionsofthisequation,respectively.ItisshownthatthesesolutionscanbeexpressedasnotonlyPfaffiansbutalsoWronskiansandGrammians.

  • 标签: Wronski行列式 KP方程 双线性形式 可表