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149 个结果
  • 简介:地上凿穿表面的3D倒置为复杂geo电的模型的电的数据仍然是在地球物理的探索的一个挑战性的问题。我们为3D倒置开发了一个节目到地上凿穿表面电的数据基于伪分析的近似(质量保证)并且re加权调整结合坡度方法(RRCG)用视觉Fortran6.5的算法。到向前当模特儿和Frechet衍生物计算的QA近似的申请戏剧性地加快计算。为理论模型的合成数据的试用计算证明程序快、高度精确。

  • 标签: 地上凿洞 三维反演法 地震勘探 数值模型
  • 简介:Shape-inducedphasetransitionofvortexdomainstructures(VDSs)inBaTiO_3(BT)nanodotsunderopencircuitboundaryconditionhavebeeninvestigatedusinganeffectiveHamiltonianmethod.OurcalculationindicatesthetetragonalVDSmissingincubicBTnanodotscanbeinducedbyvaryingtheshapeofananodotfromcubetoplatelet.Interestingly,anovelVDSisfoundinBTnanoplateletsinoursimulations.Furtherinvestigationshowsthatitisaresultofcompromisebetweenthegroundstateandthesymmetryoftheshapeofthenanodot.Furthermore,basedonthenovelVDS,routesofcontrollingVDSsgovernedbyhomogeneouselectricfieldanduniformstressarediscussed.Inparticular,ourresultsshowthepossibilityofdesigningmulti-statesdevicesbasedonasingleVDS.

  • 标签: 形状相变 纳米点 机械负荷 涡旋 可控性 畴结构
  • 简介:Two-dimensionalatomic-layeredmaterialisarecentresearchfocus,andsinglelayerTa2O5usedasgatedielectricinfield-effecttransistorsisobtainedviaassembliesofTa2O5nanosheets.However,theelectricalperformanceisseriouslyaffectedbyelectronicdefectsexistinginTa2O5.Therefore,spectroscopicellipsometryisusedtocalculatethetransitionenergiesandcorrespondingprobabilitiesfortwodifferentchargedoxygenvacancies,whoseexistenceisrevealedbyx-rayphotoelectronspectroscopyanalysis.SpectroscopicellipsometryfittingalsocalculatesthethicknessofsinglelayerTa2O5,exhibitinggoodagreementwithatomicforcemicroscopymeasurement.NondestructiveandnoncontactspectroscopicellipsometryisappropriatefordetectingtheelectricaldefectslevelofsinglelayerTa2O5.

  • 标签: TA2O5 电气性能 单层 缺陷 二维 电子能谱分析
  • 简介:Vagusnervestimulationexertsprotectiveeffectsagainstischemicbraininjury;however,theunderlyingmechanismsremainunclear.Inthisstudy,aratmodeloffocalcerebralischemiawasestablishedusingtheocclusionmethod,andtherightvagusnervewasgivenelectricalstimulation(constantcurrentof0.5mA;pulsewidth,0.5ms;frequency,20Hz;duration,30seconds;every5minutesforatotalof60minutes)30minutes,12hours,and1,2,3,7and14daysaftersurgery.Electricalstimulationofthevagusnervesubstantiallyreducedinfarctvolume,improvedneurologicalfunction,anddecreasedtheexpressionlevelsoftumornecrosisfactor-αandinterleukin-6inratswithfocalcerebralischemia.Theexperimentalfindingsindicatethattheneuroprotectiveeffectofvagusnervestimulationfollowingcerebralischemiamaybeassociatedwiththeinhibitionoftumornecrosisfactor-αandinterleukin-6expression.

  • 标签: 局灶性脑缺血 缺血性脑损伤 迷走神经 电刺激 机制 肿瘤坏死因子
  • 简介:摘要:绿色工业建筑设计,是指工业建筑可以通过合适的设计手段有效地节省自然资源的使用,且环保、减轻空气污染,给人类创造良好、适宜、有效的使用空间环境,并在建筑设计的安全生命周期内同自然环境和谐共存的建筑设计。《工业建筑节能设计统一标准》GB51245-2017的实施,将建筑节能设计思想由民用建筑延伸到了工业建筑,覆盖了整个建筑行业;工业建筑节能潜力巨大,设计思想及技术方法,都需要思考与转变。如何把工业建筑转变成绿色建筑,是设计师和建设者共同的考虑和努力的目标。本文主要分析绿色工业建筑的电气设计的方法与要求。

  • 标签: 绿色 工业建筑 电气设计
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  • 简介:Ademultiplexingschemebasedonsemiconductoropticalamplifier(SOA)andopticalfilterforopticaltimedivisionmultiplexingdifferentialquadraturephaseshiftkeying(OTDM-DQPSK)systemisproposedandinvestigatedexperimentally.Withonlyacommonhalfbaudrateelectricalclockmodulated33%dutycyclereturn-to-zero(RZ-33)opticalclocksignalaspump,thisschemeiscost-effective,energy-efficient,andintegration-potential.Aproof-of-conceptexperimentiscarriedoutforthedemultiplexingofa2×40-GBdOTDM-DQPSKsignal.Error-freeperformanceisdemonstrated,andtheaveragepowerpenaltyforbothchannelsisabout3dB.

  • 标签: 光时分复用 QPSK信号 光学滤波器 时钟信号 解复用 SOA
  • 简介:Dielectric-barrierdischarges(DBDs)inatmosphericpressureairhavebeenstudiedbyusingapower-frequencyvoltagesource.InthispapertheelectricalcharacteristicsofDBDsus-ingglassandaluminadielectricshavebeeninvestigatedexperimentally.AccordingtotheLissajousfiguresofvoltage-charges,itisdiscoveredthatthedischargepowerforanaluminadielectricismuchhigherthanthatforaglassdielectricatthesameappliedvoltage.Also,thevoltage-currentcurvesoftheglassandaluminadielectricsconfirmthefactthatthedielectricbarriersbehavelikesemiconductingmaterialsatcertainappliedvoltages.

  • 标签: 介质阻挡放电 电压源 电气特性 空气 工频 常压
  • 简介:Brief-pulsestimulationat50Hzhasbeenshowntoterminateafterdischargesobservedinepilepsypatients.However,theoptimalpulsestimulationparametersforterminatingcorticalelectricalstimulation-inducedafterdischargesremainunclear.Inthepresentstudy,weexaminedtheeffectsofdifferentbrief-pulsestimulationfrequencies(5,50and100Hz)oncorticalelectricalstimulation-inducedafterdischargesin10patientswithrefractoryepilepsy.Resultsdemonstratedthatbrief-pulsestimulationcouldterminatecorticalelectricalstimulation-inducedafterdischargesinrefractoryepilepsypatients.Inconclusion,(1)abrief-pulsestimulationwasmoreeffectivewhentheafterdischargedidnotextendtothesurroundingbrainarea.(2)Ahigherbrief-pulsestimulationfrequency(especially100Hz)wasmorelikelytoterminateanafterdischarge.(3)Alowcurrentintensityofbrief-pulsestimulationwasmorelikelytoterminateanafterdischarge.

  • 标签: 短脉冲 电刺激 高频率 诱导 皮质 电流强度
  • 简介:Strontium-zinc-oxide(SrZnO)filmsformingthesemiconductorlayersofthin-filmtransistors(TFTs)aredepositedbyusingion-assistedelectronbeamevaporation.Usingstrontium-oxide-dopedsemiconductors,theoff-statecurrentcanbedramaticallyreducedbythreeordersofmagnitude.Thisdramaticimprovementisattributedtotheincorporationofstrontium,whichsuppressescarriergeneration,therebyimprovingtheTFT.Additionally,thepresenceofstrontiuminhibitstheformationofzincoxide(ZnO)withthehexagonalwurtzitephaseandpermitstheformationofanunusualphaseofZnO,thussignificantlychangingthesurfacemorphologyofZnOandeffectivelyreducingthetrapdensityofthechannel.

  • 标签: 氧化物半导体 薄膜晶体管 掺锶 电学特性 六方纤锌矿结构 电子束蒸发沉积
  • 简介:粉状的LiCr0.35Mn0.65O2的电的传导性在温度范围在高压力下面被测量直到26.22GPa由使用一个钻石铁砧房间的300413K。电导率和激活热含量在5.36GPa和21.66GPa不连续地变化,这被发现。在压力范围1.105.36GPa,压力增加激活热含量并且减少散布的搬运人,它最后导致传导性增加。在压力范围6.3221.66GPa和22.6026.22GPa,有压力增加的激活热含量减少,它有积极贡献到电的电导率增加。二导致压力的结构的阶段转变被发现由在原处在高压力下面X光检查衍射,它导致电导率和激活热含量的不连续的变化。

  • 标签: 电导率测量 高压力 相变行为 压力范围 活化焓 温度范围
  • 简介:ObjectivesToinvestigatetheeffectofelectricalstimulationduringabsoluterefractoryperiodoncontractionandrelaxationofventricularmyocytesfromnormalguinea-pigs.MethodsTheguinea-pigventricularmyocyteswereobtainedbyenzymedigesting,andtheextentofitscontractionandrelaxationandCa^2+transientwererecordedthroughthemotionedgedetectionsystem.Results①Thecontractingextentofguinea-pigventrieularmyocytesincreased15.45±6.48%,andthepeakvelocityofshorting(contraction)andthepeakvelocityofrelengthening(relaxation)increased15.97±8.37%and21.63±8.06%respectively(n=10);②Theextentofventricularmyocytesfluorescenceratio(360/380)(F360/F380)increased22.55±9.08%,andthepeakvelocityofventricularmyocytesF360/F380increased36.75±9.77%and23.62±4.47%duringshortingandrelengtheningrespectively(n=6).ConclusionsAppropriateelectricalstimulationmaystrengthenthenormalguinea-pigcontractingandrelaxingfunctionofventricularmyocytes.

  • 标签: 电刺激 绝对不应期 心肌细胞 几内亚猪
  • 简介:Anewthree-dimensionaldynamicsandelectrificationcoupledmodelhasbeendevelopedforinvestigatingthecharacteristicsofmicrophysics,dynamicsandelectrificationinsidethunderstorms.Thismodelisbasicallymodifiedfromathree-dimensional,time-dependent,anddual-parametercloudmodeloriginallyestablishedinIAP(InstituteofAtmosphericPhysics)andatwo-dimensionalaxisymmetricclouddynamicsandelectrificationcoupledmodel.Primarymodificationstothemodelincludenotonlythecouplingofelectrificationwithdynamicalandmicrophysicalprocesses,butalsothelightningdischargeprocessandscreeninglayereffectatthecloudtopaswell.Apartfromincludingafulltreatmentofsmallionswithattachmenttosixclassesofhydrometeors,theinductiveandnon-inductivechargingmechanismsaremorespecificallyconsidered.AcasesimulationofJuly19.1981CCOPEisperformedaimingtovalidatethepotentialcapabilityofthemodel.Comparisonbetweenmodelresultsandobservationsrevealsthatthemodelhasthecapacitytoreproducemanyoftheobservedcharacteristicsofthunderstormsindynamical,microphysical,andelectricalaspects.

  • 标签: THUNDERSTORM ELECTRIFICATION PARAMETERIZATION COUPLING
  • 简介:Thestatusandthevariationofelectricalresistanceofimpactedcarbonfiber/epoxy-matrixcompositeswerestudiedbyultrasonicF-scanandelectricalresistancemeasurementTheexperimentalresultsshowsthatimpactdamageenergythresholdvalueofcarbonfabric/epoxy-matrixcompositescandeterminebyusingultrasonicF-scan.Whentheimpactenergyexceedsthethresholdvalue,damageisgeneratedincomposites.Electricalresistanceofimpactedcompositesischangedowingtothecontactofeachcarbonfiberunitincomposites,whichcauseachangeoftheseries-parallelinconductors.Theveracityofdetectingimpactdamageincompositescanbeimprovedinthiscase.

  • 标签: 环氧基复合材料 碳纤维织物 电阻测量 冲击损伤 损伤检测 超声波
  • 简介:Wepresentanovelcoherenttransceiverforopticaldifferentialphase-shiftkeying/differentialquadraturephase-shiftkeying(DPSK/DQPSK)signalsbasedonheterodynedetectionandelectricaldelayinterferometer.Asimulationframeworkisprovidedtopredictatheoreticalsensitivitylevelforthereportedscheme.Highsensitivityof-45.18dBmisachievedfor2.5-Gb/sreturn-to-zero(RZ)-DPSKsignal,andhighsensitivitiesof-36.83dBm(Itributary)and-35.90dBm(Qtributary)areobservedfor2.5-GBaud/sRZ-DQPSKsignalinback-to-backconfiguration.Transmissionforbothsignalsover100kmisalsoinvestigated.Experimentalresultsarediscussedandanalyzed.

  • 标签: DPSK信号 信号收发器 DQPSK 高灵敏度 外差探测 相干光