简介：ThispaperpresentsthebehavioranalysisofmodularmultilevelconverterunderDCpole-to-poleshort-circuitfault,whichisanimportantissueinfaultmanagement,electricalsystemdesignandMMCbasedpowersystemprotectionandcontrol.Firstly,thetransientbehaviorisanalyzedandtheconductionoverlappingangleγisdefined.Secondly,sevenpossibleshort-circuitcurrentpathsinducedbydifferentγvaluesareidentified,andthecorrespondingengineeringshort-circuitcurrentcalculationmethodsforbothACandDCsidesareproposed.Andthen,theinfluencesofimpedancedistributionfactorkandequivalentshort-circuitresistanceRSConshort-circuitcurrentsareelaborated.Finally,casestudyisusedtoverifytheeffectivenessoftheproposedanalysismethods.

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简介：Onthebasisofapparentelasticitymethod,wederivedtheequiva-lentcircuitofcouplingvibrationofashortcolumnanddiscusseditsfrequencyequationandtheeffectsoftheloadimpedanceontheresonantfrequencyoftheshortcolumn.Bytheequivalentcircuit,wecalculatedtheinputmechanicalimpedanceofthelongitudinally-excitedshortcolumnandthecurvesoftheap-parentvibrationvelocityratioversusthegeometricaldimensionsofthecolumn.Itshowsthattheequivalentcircuitmethodisasimpleandconvenientonetoanalyzeandcalculatethecouplingvibrationoftheshortcolumn.

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简介：AnewkindofsimpleandflexibleCO_2weldingsystemwasdevelopedtocarryoutwaveformcontrol.ThesystemconsistedofIGBTinverter,PWMcircuitandmicroprocessorunit(MPU),inwhichtheoutputcurrentofconstantcurrent(CC)powersupplycouldbechangedaccordingtotransientphysicalstate,andthevariabledownsloperatecontrolcouldbeusedtoensureastableweldingprocess.Theweldingexperimentresultsprovedtheeffectivenessofthiscontrolapproach.

简介：Basedonsimpleanalyticalequations,shortcircuitcurrentdensity(JSC)oftheorganicbulkheterojunctionsolarcellshasbeencalculated.ItisfoundthattheopticalinterferenceeffectplaysaveryimportantroleinthedeterminationofJSC;andobviousoscillatorybehaviourofJSCwasobservedasafunctionofthickness.Atthesametime,theinfluenceofthecarrierlifetimeonJSCalsocannotbeneglected.Whenthecarrierlifetimeisrelativelyshort,JSConlyincreasesattheinitialstageandthendecreasesrapidlywiththeincreaseofactivelayerthickness.However,forarelativelylongcarrierlifetime,theexcitondissociationprobabilitymustbeconsidered,andJSCbehaveswave-likewiththeincreaseofactivelayerthickness.Thevalidityofthismodelisconfirmedbytheexperimentalresults.

简介：Thispaperintroducedthebasictheoryandalgorithmofthesurrogatedatamethod,whichproposedarigorouswaytodetecttherandomandseeminglystochasticcharacteristicsinasystem.TheGaussiandataandtheRosslerdatawereusedtoshowtheavailabilityandeffectivityofthismethod.Accordingtotheanalysisbythismethodbasedontheshort-circuitingcurrentsignalsundertheconditionsofthesamevoltageanddifferentwirefeedspeeds,itisdemonstratedthattheelectricalsignalstimeseriesexhibitapparentlyrandomnesswhentheweldingparametersdonotmatch.However,theelectricalsignalstimeseriesaredeterministicwhenamatchisfound.Thestabilityofshort-circuitingtransferprocesscouldbejudgedexactlybythemethodofsurrogatedata.

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简介：Inthispaper,firstlywedemonstratetheuseofnodaladmittancematrixtoconvertalow-passband-passfilterbasedonoperationalamplifier(op-amp)toacircuitbasedonasecond-generationcurrentconveyor(CCII).Thistechniqueallowsustogeteightpresumptionsoffiltercircuits.Secondly,wepresentanovelarchitecturecircuitofCCII,whichcanoperateatlowsupplyvoltageof±0.75V.AllsimulationsareperformedbyTSPICEmodels.ThesimulationresultsshowthatthiscircuithasalowimpedanceatterminalX(RX=1.01Ω),averyhighinputimpedanceatterminalY,andwidebandwidthcurrentandvoltage.Thecenterfrequencyoftheproposedfilterisvariableontheinterval[157kHz,196MHz].

简介：—Accordingtotheenergyequation,therelationbetweenreflectionandenergylossesforshortwavesfrommildbeachesisestablishedandanalysed.Areflectioncoefficientvaryingwithpositionanden-ergylossesisproposed.Differentreflectiontestsareconductedtocheckthetheoreticalanalysis.Amodi-fiedmethodtoestimatethereflectioncoefficientatvariedwaterdepthsissuggestedbasedonthelinearwavetheory.Thestudyindicatesthatthereflectioncoefficientfrommildbeacheshasachangingtrendforshortwavesapproachingshoreline.

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简介：Thispaperintroducestheconfigurationandtheoperationprinciplesofahighpowerdirectcurrentcircuitbreaker(DCCB).Thecommutatingcurrentprincipleofthebreakerisde-scribedindetailswithitstheoryandsimulationanalysis.ThetestresultspresentedshowthattheDCCBmeetstherequirementsforquenchingprotection.ItwillbeusedasthemainbreakerforquenchprotectioninEAST.

简介：在这篇文章，作者讨论二种新平面地图：平底锅扇子地图和电路边界地图，并且关于他们的枚举的功能向明确的表情提供不同参数。同时，为电路的二个明确的数公式有二个参数的立方的边界地图：尺寸和根脸的原子价，也被提取。关键词生根的地图-枚举功能-枚举-电路边界地图先生(2000)题目分类05C10-05C30

简介：这篇论文为雪崩光电二极管(APD)建议一个控制方法有温度的反向的偏爱赔偿和负担抵抗赔偿。APD察觉电路上的背景光和负载抵抗的影响详细被分析。温度赔偿和负担抵抗赔偿的一个理论模型被建立，它被用于偏导电路设计的APD。这个控制方法对激光范围查找者在车辆上使用了的LD特别合适，这被预言。试验性的结果证实设计在这建议纸能可观地改进范围查找者的表演。CLC数字TN364+.2

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简介：ＭｅｅｔｉｎｇｓａｎｄＳｈｏｒｔＴｒａｉｎｉｎｇＣｏｕｒｓｅｓＭｅｅｔｉｎｇｓａｎｄＳｈｏｒｔＴｒａｉｎｉｎｇＣｏｕｒｓｅｓＪｕｌｙ７－１０，１９９７．３ｒｄａｉｒｂｏｒｎｅｒｅｍｏｔｅｓｅｎｓｉｎｇｃｏｎｆｅｒｅｎｃｅａｎｄｅｘｈｉｂｉｔｉｏｎ...