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500 个结果
  • 简介:Ahybridmodelisusedtosimulatethecharacteristicsofacollisionalsheathinacapacitivelycoupledplasma(CCP)drivenbyadualfrequencysourceincludingaRFandapulsedcurrentsourceappliedtothesameelectrode.Thehybridmodelincludesafluidmodelusedtosimulatethecharacteristicsofthecollisionalsheath,andaMonte-Carlo(MC)methodtoobtainbothionenergyandionangulardistributions(IEDsandIADs)impingingonthesubstrate.Theeffectsofthelowfrequencyofthepulsedsourceandthegaspressureonthecharacteristicsofthesheath,aswellastheIEDsandIADs,arestudied.Theresultsshowthattheratioofpulse/RFfrequencyandthegaspressurearecrucialforthecharacteristicsofthesheathandtheIEDs.TheIADsaresignificantlymoresensitivetothegaspressure.

  • 标签: 偏置碰撞 耦合等离子体 脉冲电流源 双频 爆炸装置 气体压力
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  • 简介:ThelowresistancePTCceramicthermistormaterialwithexcellenteleectricalpropertiesaresuccessfullyfabricatedbyrawmaterialsatindustrialrangemadeinourcountryonthestudyofitscompositionexpressionandfabricationprocessbyusingtheadditionofNb,La,Y,Ta,microstructureregulatorBNandASTLphase.Thecompositionanditsfabricationmethodarestudied.TherelationofelectricalpropertiesofthePTCceramicmaterialtoitscompositionexpressionanditsrelatedelectricalpropertiesarediscussed.

  • 标签: 半导体陶瓷 低电阻 PTC 正温度系数 热敏电阻
  • 简介:Thedeterminationofthesoundpowerofasourceissimpleinareverberationchamber,butusuallylowervalvesareobtainedatlowfrequenciesthanthefree-spacevalue.Itisshownthatthesoundpowerdeterminedinareverberationchamberdependsnotonlyonitsfree-spacepower,butalsoonthepositionsofthesourceandthereveiver,aswellasthewaythemeasurementsaremadeandaveraged.Exactandstatisticalformulasarederivedtoaccountforthesefactors.Theresultsexplainthediscrepancyandagreewellwithearlierexperiments.Basedonthetheory,parcticabletechniquesofsoundpowerdetermina-tionarepropesedandcorrectpowerformulaspresented.

  • 标签: chamber averaged EARLIER EXPLAIN corrected FORMULAS
  • 简介:Strainageinginsteelwasfirstobservedduringthe19thcenturywhenthemaximumloadcarryingcapacityofatestpiecewasincreasedafterithadbeenretestedfollowingapreviousseriesoftestinginaplasticrange.Overthelastdecades,agreatdealofresearchhasbeenperformedtogaindeeperinsightsintothephenomenonofstrainageing.Thesynergisticdevelopmentoftheoreticalhypothesisandnewexperimentalevidenceshaspromotedtheunderstandingofthemechanismsunderlyingstrainageing.Thecontentofthispaperisorganizedintofourcomponents.First,wehavecomparedthemaintheoriesdevelopedinrecentyears.Second,wehavesummarizedthemetallurgicaleffectsonthestrainageingbehaviorobservedinexperiments.Moreover,wehavemadeanattempttocorrelatetheexperimentalresultsandtheabove-mentionedtheories.Third,wehaveproposedafeasiblesolutiontocontrolstrainageinginlowcarbonsteels.Finally,wehaveelaboratedthepotentialityoftheatomprobetechniqueinfacilitatingdirectcharacterizationofthedistributionofsoluteatoms.

  • 标签: 应变时效 低碳钢 实验证据 溶质原子 承载试验 最大负荷
  • 简介:Theharmonicanalysismethodbasedonhighandlowwaterlevelsisdiscussedinthispaper.Inordertomakefulluseoftheinformationofhighandlowwaterobservations(thetimederivativeofwaterlevelattheobservationtimeiszero),theweightcoefficient,w,isintroducedtocontroltheimportanceofthepartrelatedtothisinformationintheerrorformula.Themajordiurnalconstituents,O1andK1,andsemi-diurnalconstituents,N2,M2andS2areselecteddirectlyfromthemonthlydataanalysis,andsomeotherimportantconstituents,P1,v2andK2,areincludedastheinferredconstituents.Theobtainedharmonicconstantsofthemajorconstituentsareveryclosetothoseobtainedfromtheanalysisofhourlydata,andthisshowsthathighandlowwaterdatacanbeusedtoextracttidalconstantswithhighaccuracy.Theanalysisresultalsoshowsthattheinferenceandtheweightingcoefficientareimportantinthehighandlowwaterdataanalysis,anditissuggestedthatw≥1shouldbetakeninmonthlyhighandlowwaterdataanalysis.Thisanalysismethodcanbeuseddirectlytoanalyzealtimetricdatawithw=0.

  • 标签: 潮汐分析 水位 海洋工程 分析方法
  • 简介:在这份报纸,我们显示出怎么为图象结束在常规或在常规附近的质地利用低等级、稀少的结构。我们的方法为随机、连续的贪污基于统一明确的表达。除了质地的低等级性质,算法也使用自然图象的稀少的假设:因为自然图象是piecewise,变光滑,它在某些转变领域是稀少的(例如Fourier或小浪变换)。我们联合低等级并且质地的稀少性质在建议算法一起想象。我们的算法能自动地并且正确地基于凸的优化修理一块贿赂质地的全球结构,甚至没有要完成的区域的精确信息。这个算法集成质地校正并且修理进一个优化问题。通过广泛的模拟,我们证明我们的方法能完成并且修理错误比存在低等级的矩阵恢复方法更好与随机、连续的支持贿赂的质地。我们的方法证明超越本地补丁的重要优点在处理大贪污,不一致的质地,和大观点变丑基于质地合成技术。

  • 标签: 纹理图像 凸优化 修复 自然图像 全局结构 稀疏性
  • 简介:·AIM:Toevaluateandcompareaspherictoricintraocularlens(IOL)implantationandasphericmonofocalIOLimplantationwithlimbalrelaxingincisions(LRI)tomanagelowcornealastigmatism(1.0-2.0D)incataractsurgery.·METHODS:Aprospectiverandomizedcomparativeclinicalstudywasperformed.Therewererandomlyrecruited102eyes(102patients)withcataractsassociatedwithcornealastigmatismanddividedintotwogroups.ThefirstgroupreceivedtoricIOLimplantationandthesecondonemonofocalIOLimplantationwithperipheralcornealrelaxingincisions.Outcomesconsideredwere:visualacuity,postoperativeresidualastigmatism,endothelialcellcount,theneedforspectacles,andpatientsatisfaction.Todeterminethepostoperativetoricaxis,allpatientswhounderwentthetoricIOLimplantationwerefurtherevaluatedusinganOPDScanIII(NidekCo,Japan).Follow-uplasted6mo.·RESULTS:Themeanuncorrecteddistancevisualacuity(UCVA)andthebestcorrectedvisualacuity(BCVA)demonstratedstatisticallysignificantimprovementaftersurgeryinbothgroups.Attheendofthefollow-uptheUCVAwasstatisticallybetterinthepatientswithtoricIOLimplantscomparedtothosepatientswhounderwentimplantationofmonofocalIOLplusLRI.Themeanresidualrefractiveastigmatismwasof0.4DforthetoricIOLgroupand1.1DfortheLRIgroup(P<0.01).Nodifferencewasobservedinthepostoperativeendothelialcellcountbetweenthetwogroups.·CONCLUSION:Thetwosurgicalproceduresdemonstratedasignificantdecreaseinrefractiveastigmatism.ToricIOLimplantationwasmoreeffectiveandpredictablecomparedtothelimbalrelaxingincision.

  • 标签: LOW corneal ASTIGMATISM TORIC intraocular lenses
  • 简介:从我国的能源消耗的比例入手,介绍了我国能源的现状,系统阐述了民用建筑节能的定义与意义,指出了能耗的浪费现象,提出了解决的方法.介绍了门窗绝热的概念与度量、门窗遮阳的概念与度量。重点分析了LOW—E玻璃的概念及生产方法,对LOW—E玻璃的种类、特点、节能特性及使用地区进行阐述,突出LOW—E玻璃的节能特性。最后提出了建筑节能的要求。

  • 标签: LOW—E玻璃 辐射 透过率 节能
  • 简介:Thereisatypeofnodalsurfaceimposedbysymmetryonwavefunctions.Thesesurfacesarecrucialtotheorderingoflow-lyingstates.Basedonananalysisofthistypeofsurfaceandbasedonexistingtheoreticalresults,thefeatureofthelow-lyingspectrumoftheHe-tetramerisstudied,andthecandidatesofboundstatesandnarrowresonancesaresuggested.

  • 标签: He-四聚物 低能级能谱分析 对称效应
  • 简介:介绍是被调节到需要的一个低噪音接口电路自己组装单层生物传感器SoC。读出电路的相关双采样(CDS)单位能有效地减少1/f噪音,KTC噪音和微数组的固定噪音。电路在0.6m/level被模仿7标准互补金属氧化物半导体过程,和模仿的结果证明输出电压与微数组的transducing电流有好线性。这是包括分享减少联合起来的CDS的一个普通一半电路和噪音的四个放大器的一个新奇电路。它能广泛地为微数组生物传感器被使用。

  • 标签: SOC 生物传感器 读出回路 低噪音
  • 简介:由刺的阀值的频率依赖上的数字模拟,即为到火的一个神经原,在周期的刺激的批评振幅上,我们发现那浓密在耳蜗的原子展览频率选择行为的房间。然而,选择频率乐队一浓密房间是远的离开的比较喜欢光谱在人和哺乳动物的范围听觉的感觉。位于这项神经活动下面的机制也被讨论。离子隧道密度举办的Furtherstudies表演选择频率乐队上的很少影响浓密房间。这些调查结果建议频率选择在的neuronal行为浓密在单个房间和人口层次的房间可能不与频率辨别机能上地相关。我们的结果可以揭示一个神经提示到再考虑在上浓密房间在声音的听觉的信息处理的功能的角色频率“。

  • 标签: 听觉系统 中脑 耳蜗核 频率选择行为 数值模拟
  • 简介:Octave-spanningfrequencycombgenerationinmicroresonatorsispromising,butstrongspectrallossescausedbymaterialabsorptionandmodecouplingbetweentwopolarizationsormodefamiliescanbedetrimental.Weexaminetheimpactofthespectrallossandproposerobustcombgenerationwithalossofeven300dB/cm.CavitynonlineardynamicsshowthataphasechangeassociatedwithspectrallossescanfacilitatephasematchingandKerrcombgeneration.Giventhisuniquecapability,weproposeanovelarchitectureofon-chipspectroscopysystems.

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  • 简介:Thephaseandfrequencylockingofmicrowave,millimeterwavepowercombiningwereanalysedandsummarizedinanall-roundway.Themaster/slavephaselockingofcavityoscillators,thepeerphaselockingofmutuallycoupledoscillators,andthepeerphaselockingofring-connectedmultipleoscillatorswereinvestigated.Theresultsofnumericalcalculations,andtherelationsofphasetophaselockingmodelandoscillatorparametersweregiven.Andthecavityandspacepowercombiningaspectsformicrowaveandmillimeterwavewerepresented.

  • 标签: Power combining PHASE LOCKING Frequency LOCKING
  • 简介:Itisidentifiedthatbarelypassingelectronsarethedriveofthee-Gshbones,ratherthanthebarelytrappedelectronsatlowfrequency.Thefrequencyjumpine-Bshboneexperimentsisreproducedandanalyzed.Itisfoundthatthee-Bshbonefrequencyincreaseswiththehotelectronenergy,whichisconsistentwiththeexperiments.Thegrowthrateofthemode(m=2,n=2)isgreaterthanthatofthemode(m=1,n=1).

  • 标签: 实验 鱼刺 频率 跃变 捕获电子 电子能量
  • 简介:Themethodformeasuringthestrainofanobjectusinganopticalfiberandafrequencymodulation(FM)coupledcaritysemiconductorlaserispro-posed.ThismethodusesthecoherentFMheterodyneprincipleoftheMichelsonin-terferometerandcanavoidtheπ/2nonreciprocalphasebiasandphaseshiftingproblemexistingingeneralfiberopticinterferentialsensors,themaximumdetec-tionrangeislimitedbythecoherentlengthofthesemiconductorlaseranditsrela-tivefactor.

  • 标签: 光纤传感器 调频 半导体激光器 干涉计 应力测量