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309 个结果
  • 简介:不知道从什么时候起,各位体育粉丝觉得光看这星那星一颗颗孤独地闪不够劲了,变得爱看成群结队一拥而上的,甭管当事人喜不喜欢,什么“梦幻组合”、“三剑客”、“四大天王”甚至“七匹狼”都陆陆续续闪亮登场。小编们不知什么时候也沾染上了这习气,灵光一闪推出这个“XX组合”专题,幸好和“七匹狼”什么的比起来还算收敛,还只是成双成对地上……不过也是.整天吃饭就一个菜也腻味,喜不喜欢,就当换换口味吧!下面先看我们连环致响炮的第一发:

  • 标签: 舒马赫 世界一级方程赛车 运动员 高中 英语 双语阅读
  • 简介:Becauseofitsgoodconditionwithmechanics,logarithmicspiraldoublecurvearchbamhasbeenwidelyusedinthepracticalengineering.Theintroductionofanewmethodinhowtodividetransversejointinarchdamwillbegivenandthefurtherresearchofitscalculationhasbeendone.TheC++isusedinelectronicprocedureandthe3DsimulationhasbeenfinishedwithAutoCAD,whichwillprovidetheobjectmodelforcomputersimulationofthearchdamandthedivisionoffiniteelementmesh.Meanwhile,thismethodindividingthetransversejointinarchdamalsocanbetakenasthecalculatedbasisforthedesignandcalculationofarchdam,constructionloftingandthecalculationoftheworkamount.

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  • 简介:Plasmonicgratingstructureshavebeenshowneffectiveatincreasingnear-fieldopticalenhancement.Adoublewidthplasmonicgratingdesignisintroduced,whereeachperiodhastwoalternatingmetalwidthsseparatedbyananogap.Withthisnewdesign,analysishasshownthatplasmonicresonancescouplebetweeneachmetalsection,resultinginevengreateropticalenhancementcomparedwithsingle-widthgratings.Thegeometrythatgivesthegreatestopticalenhancementhasbeendeterminedwithacomputationalmodel.Thisworkdemonstratesthattheincreasedenhancementisduetohybridizedmodesthatcouplebetweenthetwogratingsegments.

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  • 简介:多层的铱涂层在钨上被生产由双发光的碳化物底层血浆过程。作为比较,单层也被生产。微观结构和形态学用扫描电子显微镜学被观察。谷物取向和阶段用X光检查衍射被决定。涂层的剩余压力被学习旁边看一眼的发生X光检查衍射。涂层的粘合剂力量被一个擦伤测试者测量。结果显示出那单层并且多层有一个多晶的阶段与一强壮(110)思考。涂层没有分层的证据有优秀粘附。单层的粘合剂力量并且多层分别地是大约50和43N。在底层和层之间的界面的反应发生了,一个新WIr阶段由于高温度的免职过程被发现。在单层的剩余压力并且多层分别地是-1.6和-1.1GPa。

  • 标签: 形态学 剩余应力 粘合剂力量 单层 多层
  • 简介:一只新奇侧面的双门通道领域效果晶体管(DG-TFET)被学习,它的性能被二维的设备模拟与代码ISE介绍。Theresult证明这只新通道晶体管允许在60mV/dec下面的更陡峭的次于最低限度的秋千,超级低供应电压(在V-DD<合用0.3V)并且rail-to-rail逻辑(在排水管来源电压V-DS=的重要在状态上电流50mV)为好攻击的技术,high-k/metal的可获得性的假设与相等的门氧化物厚度传输结束字符=叠0.24nm和工作工作差别4.5材料的eV。

  • 标签: 侧向多门 穿隧式场效应晶体管 数值模拟 输出特性
  • 简介:TheDonnelltheoryofshellwasappliedtodescribeshellmotion.Theinnerandoutershellswerestiffenedbytransversecomponents.Usingdeformationharmoniousconditionsoftheinterface,theeffectsofstiffenersweretreatedasreverseforcesandmomentsonthedoublecylindricalshell.Intheacousticfieldproducedbyvibrationandsoundradiationofthedoubleshell,thestructuredynamicequation,Helmholtzequationinthefluidfieldandthecontinuityconditionsofthesurfaceoffluid-structurecomposethevibrationequationcoupledbythesound-fluid-structure.Theextractofacousticpressurecomesdowntotheextractofcouplingvibrationequation.Thenearfieldacousticpressurecanbesolveddirectlybycomplicatedcalculationalmethods.

  • 标签: double CYLINDRICAL SHELL coupling VIBRATION equation
  • 简介:Activatedcarbons(ACs)withawiderangeofsurfaceareasweremadefrompetroleumcokebymeansofKOHactivation.Theelectrochemicalcharacterizationwascarriedoutforseveralactivatedcarbonsusedaspolarizableelectrodesofelectricdouble-layercapacitors(EDLCs)inanaqueouselectrolyticsolution.Theporousstructuresandelectrochemicaldouble-layercapacitanceoftheactivatedcarbonswereinvestigatedbyvirtueofnitrogengasadsorptionandconstantcurrentcycling(CCC)methods.Therelationshipamongthesurfacearea.porevolumeoftheactivatedcarbonsandspecificdouble-layercapacitancewasdiscussed.ItwasfoundthatthespecificcapacitanceofACsincreasedlinearlywiththeincreaseofsurfacearea.Thepresenceofmesoporesintheactivatedcarbonswithveryhighsurfacearea(>2000m^2/g)wasnotveryeffectiveforthemtobeusedasEDLCs.Theinfluenceofchemicalcharacteristicsoftheactivatedcarbonsonthedoublelayerformationcouldbeconsideredtobenegligible.

  • 标签: 多孔活性炭电极 电偶层电容器 比电容 电化学特征 氢氧化钾
  • 简介:AccumulatingevidencehasdemonstratedthatregulatoryT(Treg)cellsplayanimportantroleinthemaintenanceofimmunologicself-toleranceandindown-regulatingvariousimmuneresponses.Thus,therehasrecentlybeenanincreasinginterestinstudyingthebiologyofTregcellsaswellastheirpotentialapplicationintreatingimmunediseases.ManytypesofTregcellsubsetshavebeenreportedinavarietyofdiseasemodels.Amongthesesubsets,αβ-TCR+CD3+CD4-CD8-doublenegative(DN)TregcellsaredefinedbytheircapabilityofinhibitingimmuneresponsesviadirectlykillingeffectorTcellsinanantigenspecificfashion.Furthermore,DNTregcellshavebeenshowntodevelopregulatoryactivityafterencounteringspecificantigens,partiallymediatedbytheacquisitionofMHC-peptidecomplexesfromantigenpresentingcells(APCs).ThepresentationofacquiredalloantigensonDNTcellsallowsforthespecificinteractionbetweenDNTregcellsandalloantigenreactiveeffectorTcells.OncetheDNTregandtargetcellshavecomeintocontact,killingisthenmediatedbyFas/Fas-ligandinteractions,andperhapsthroughotherunidentifiedpathways.Furthercharacterizationofthefunctions,molecularexpressionandmechanismsofactivationofDNTregcellswillhelpinthedevelopmentofnoveltherapiestoinduceantigenspecifictolerancetoselfandforeignantigens.Cellular&MolecularImmunology.2004;1(5):328-335.

  • 标签: 双负性调节T细胞 抑制作用 免疫反应 细胞移植 Fas配合体 免疫学
  • 简介:AtheoreticalanalysisontheelectricdoublelayerformednearthesurfaceofaninfinitecylinderwithanellipticalcrosssectionandaprescribedelectricpotentialinanionicconductorwasperformedusingthelinearizedGouy–Chapmantheory.Asemi-analyticalsolutionintermsoftheMathieufunctionswasobtained.Thedistributionsoftheelectricpotential,cations,anions,andelectricfieldwerecalculated.Theeffectsofvariousphysicalandgeometricparameterswereexamined.Thefieldsvaryrapidlyneartheellipticalboundaryandarenearlyuniformatfarfield.Electricfieldconcentrationswerefoundattheendsofthesemi-majorandsemi-minoraxesoftheellipse.Theseconcentrationsaresensitivetothephysicalandgeometricparameters.

  • 标签: ELLIPTICAL CYLINDER ELECTRIC double layer SEMI-ANALYTICAL
  • 简介:Inthisstudy,tungsten(W)wascoatedonacopper(Cu)substratebyusingdouble-glowdischargetechniqueusingapureWpanelasthetargetandargon(Ar)asthedischargeandsputteringgas.ThecrystalstructureoftheWcoatingwasexaminedbyX-raydiffraction(XRD).Scanningelectronmicroscopy(SEM)wasperformedwithcross-sectionimagestoinvestigatethepenetrationdepthofWintotheCubody.Additionally,thepropertiesofwearabilityresistance,corrosionresistanceandmechanicalstrengthoftheWcoatedCumatrixwerealsomeasured.Itisconcludedthatindouble-glowplasma,WcoatedCucanbefacilelyprepared.ItisnoticedthatthetreatmenttemperatureheavilydominatesthepropertiesoftheW-Cucomposite.

  • 标签: 辉光离子 钨涂层 电铜 W-CU复合材料 扫描电子显微镜 表征
  • 简介:ItisshownthatananomalyofthespectrumtakesplaceintheinterferencefieldwhenYoung'sdouble-slitinterferenceexperimentisilluminatedbyspatiallycoherentpolychromaticlight.Specifically,drasticspectralchanges(i.e.thespectralshiftsexhibitarapidtransition)occurinthevicinityofthedarkfringes.Thepotentialapplicationsofthisspectralanomalyarealsoconsidered.

  • 标签: 反常行为 杨氏双缝干涉实验 空间连续多色光 光谱转换
  • 简介:ANASYMPTOTICPROPERTYOFTHENUMBEROFSPANNINGTREESOFDOUBLEFIXEDSTEPLOOPNETWORKSYONGXUERONGANDZHANGFUJIAbstract.LetT(C(p,1,q))bet...

  • 标签: NETWORK
  • 简介:Atheoreticalstudyofresonanttunnelingiscarriedoutforaninverseparabolicdouble-barrierstructuresubjectedtoanexternalelectricfield.Tunnelingtransmissioncoefficientanddensityofstatesareanalyzedbyusingthenon-equilibriumGreen’sfunctionapproachbasedonthefinitedifferencemethod.Itisfoundthattheresonantpeakofthetransmissioncoefficient,beingunityforasymmetricalcase,reducesundertheappliedelectricfieldanddependsstronglyonthevariationofthestructureparameters.

  • 标签: 双势垒结构 抛物型 电子输运 电场作用 透射系数 有限差分法
  • 简介:Thefreevibrationproblemofrectangularthinplatesisrewrittenasanewuppertriangularmatrixdifferentialsystem.Fortheassociatedoperatormatrix,wefindthatthetwodiagonalblockoperatorsareHamiltonian.Moreover,theexistenceandcompletenessofnormedsymplecticorthogonaleigenfunctionsystemsofthesetwoblockoperatorsaredemonstrated.Basedonthecompleteness,thegeneralsolutionofthefreevibrationofrectangularthinplatesisgivenbydoublesymplecticeigenfunctionexpansionmethod.

  • 标签: 本征函数展开法 矩形薄板 自由振动 特征函数 薄板振动 矩阵微分系统
  • 简介:Rotatingdisksubjectedtostationarysliderloadingsystemisaverycommonmechanicalstructure.Thispaperinvestigatesthemultibodydynamicsofarotatingflexibleannularthindisksubjectedtodoublesliderloadingsystems.Alongtherotatingdiskradialandcircumferentialdirections,twostationarysliderloadingsystemsaredistributed.SystemdynamicmodelissolvedbyGalerkin'smethod,andthennaturalfrequency,dynamicstabilityandmodeshapearedeterminedwithaquadraticeigenvalueproblem.Effectsofthedistributingpositionsandinteractionmechanismofthedoublesliderloadingsystemsonnaturalfrequency,dynamicstabilityandmodeshapearediscussedandinvestigated.

  • 标签: 加载系统 双滑块 二次特征值问题 转动 磁盘 装载系统
  • 简介:为在位置精确上获得高度的二种方法的效果被分析,并且错误表情被推出。当那个高度错误在东方西方位置误差上有小效果,在二个盒子中,放的精确上的一样的高度错误的效果是相同的许多模拟结果表演,和二个高度错误影响放精确的规则能被表示,但是在thesouth北方位置误差上有大效果。

  • 标签: 数字图 位置系统 位置精度 全球定位系统