简介：TheresolutionexpressionforthetemperaturedependenceofthecurrentandthresholdvoltageisdeducedaswellastheanalysisoftemperaturecharacteristicsofBJMOSFET.EquivalentcircuitofanalysisandsimulationhasbeenestablishedfortheBJMOSFETtemperaturecharacteristics.ByusingthegeneralcircuitsimulationsoftwareofPSpice9andcomputersimulation,characteristicgraphsoftheBJMOSFEToutputcharacteristic,transientcharacteristicandamplitude-frequencycharacteristicwithtemperaturevariationareobtained.TheresultsaccordedverygoodwiththeoreticalanalysisandprovedthatBJMOSFEThasbettertemperaturecharacteristicsthantraditionalMOSFET.

简介：ＰｈｏｔｏｃｏｎｄｕｃｔｉｖｉｔｙＣｈａｒａｃｔｅｒｉｓｔｉｃｓｏｆＰｏｒｏｕｓＳｉ①ＣＨＡＯＺｈａｎｙｕｎ，ＷＡＮＧＫａｉｙｕａｎ（ＤｅｐａｒｔｍｅｎｔｏｆＥｌｅｃｔｒｏｎｉｃＥｎｇｉｎｅｒｉｎｇ，ＳｏｕｔｈｅａｓｔＵｎｉｖｅｒｓｉｔｙ，Ｎａｎｊｉ...

简介：TheradiationfieldsoftheArchimedeanspiralantennaarederivedbyapproximatingthespiralwithaseriesofsemicircles.Thecomputationalformulaeforcalculatingtheradiationfieldsoftheairbornespiralantennasaredevelopedbyusinggeometricaltheoryofdiffraction(GTD).Thecalculatedresultsareingoodagreementwiththeexperimentalones.

简介：ThereolutioncharacteristicofGaAs/GaAlAstrransmissionphotocathodeisanimportantparameterinthirdgenerationintensifiers.ThemodulationtransferfunctionofGaAs/GaAlAstransmissionphotocathodeisderivedfromasimpletwo-dimensionaldiffusionequation.Thetheoreticalresolutioncharacteristicofa2μmthickGaAs/GaAlAstransmissionphotocathodeiscalculated.TherelationshipbetweenresolutionandparametersinGaAs/GaAlAstransmissionphotocathodeisdiscussed.AconclusionisshownthatonecandesigntheGaAs/GaAlAstransmissionphotocathodeformaximumquantumefficiency,sincethesacrificeintheresolutiondoesn'tlimitsystemperformances.

简介：Theinfluenceofairgapsontheresponseoftransmissionforatransverse-electricmodeparallel-platewaveguide(TE-PPWG)withasinglecavityanddoublecavitieshasbeenstudiedexperimentally.Astheairgapislargerthantheresonantwavelengthofhighordercavitymodeinthesingledeepgroovedwaveguide,onlythefundamentalcavitymodecanbeexcitedandsingleresonancecanbeobservedinthetransmissionspectrum.Basedonaboveobservations,atunablemultibandterahertz(THz)notchfilterhasbeenproposedandthevariationofairgaphasturnedouttobeaneffectivemethodtoselectthebandnumber.Experimentaldataandsimulatedresultsverifythisbandnumbertunability.Thismechanicalcontrolmechanismforelectromagneticinducedtransparency(EIT)willopenadoortodesignthetunableTHzdevices.

简介：Anewbipolarjunctionfield-effecttransistor(BJFET)wasdescribed.ThetheoreticalanalysisandcomputersimulationofBJFETobstructivecharacteristicareachieved.ThegatebiasvoltageaffectstheBJFETobstructivevoltagegreatly.TheBJFETobstructivecharacteristicisrelevanttostructureparametersofchannelwidthWandchannellengthL.Thedecrease-bias-voltageoperationcanweakenthedeviceobstructivecharacteristic.TheforwardturnindeviceforwardobstructiveregioncanalsoaffecttheBJFETobstructivecharacteristic.BJFEThasagoodhightemperatureobstructivecharacteristicandcanbeapplyingtohightemperaturestatusashighvoltageswitchdevices.

简介：DetailedanalysisontransientcharacteristicsofECLcircuitsareperformedinthispaper,thenarelativelyexactpropagationdelayexpressionappliedforalltemperaturesispresented.Thecryogeniccharacteristicsofsomedominantparameterscontributedtopropagationdelayarealsodiscussed.Themodelachievedissuitableforoptimumdesignsofhighspeeddevicesandcircuitsatalltemperatures.

简介：为了为光电子满足当前的高效光电子，有双同轴的包裹(剧降)的二种包裹类型和球格子数组(BGA)的电、热的表演要求，被建模并且热地模仿了，他们的热描述被在免费的空中使用温度轮廓和模仿的加热描述曲线比较并且讨论并且强迫了空气周围。结果证明那BGA有上级在内并且在全部的表演外面，并且在高度综合的光电子有有希望的未来。

简介：BasedontheanalysisofDCcharacteristicsofsiliconbipolartransistorsatlowtemperature,DCanalyticmodelsofECLcircuitatlowtemperaturearederived,thencomparedwiththeexperimentaldataandcomputersimulationresults.ThemodificationofSPICEBJTmodelabouttemperatureanddesignoflowtemperatureECLcircuitarediscussed.

简介：Toestablishanefficientinter-satellitelink(ISL)inanLEOnetwork,theeffectofgeometriccharacteristicsofISLontheISLsandthedevicesontheLEOsatelliteshouldbeexamined.BecauseofthecontinuousmovementoftheLEOsatellite,thetime-varyingbehavioursoftheISL'sgeometriccharactersisticscontinuouslychangewiththechangesofthesatellite'spositionontheorbit.ThesedynamicgeometriccharacteristicsoftheISLsareimportantforISL'sperformanceanalyzingandthedesignofthedevicesontheLEOsatellite.ThispaperdescribesdynamicgeometriccharacteristicsofISL,analyzestheimpactoftheseregulationsonthetrackingsystemofthesatellite'santennaandthepoweradjustingsystemofthesatellite'stransmitter,withtheIridiumsystemasanexample.

简介：TheprincipleofZVS-PWMinvertingcircuitisfirstdescribedbymeansofinvertingweldersupply.ThecontrastivestudyismadeonswitchingcharacteristicsandswitchinglossesofIGBTbetweenZVS-PWMandhard-switching.

简介：剩余紧张和损坏由Si培植导致了在轧了样品被学习了，以及电子特征。这些成长得当的样品与Si的不同剂量被植入(1

简介：在微弱地指导的盒子中，在核心和左手的材料纤维的cladding的力量繁殖被解决麦克斯韦鈥檚方程获得。波导效率在截止并且远离截止被分析。远离截止，波导效率等于到1。在截止，为m=0，1，波导效率平等者到零；为m=2，波导效率来临到无限；为m>2，波导效率是不到零，但是它的绝对值比1大。那些是左手的材料纤维的新奇特征。CLC数字TN253这个工作被中国(60277025)和上海领先的学术学科工程(T0102)的国家性质科学基础支持

简介：ThecharacteristicofEDFAinWDMsystemisanalyzed.ThesimulationsystembasedonthearchitectureoftheChinaInformationNetwork(CAINONET)isintroduced,andtheinfluenceofnoisefigure,gainunflatnessandoutputpowerofEDFAontheBERperformanceandscaleofnetworkisinvestigated.Moreover,theinfluenceofnoisefigureisstudiedwithdifferentcrosstalk.Meanwhile,itisindicatedthatitisimportanttoapplythe"nodeisolationprinciple"intheopticalnetwork.Theresearchresultscanprovidethevaluablereferenceforthepracticalconstructionofallopticalnetwork.

简介：Thisresearchpresentsanalgorithmforfacedetectionbasedoncolorimagesusingthreemaincomponents:skincolorcharacteristics,haircolorcharacteristics,andadecisionstructurewhichconvertstheobtainedinformationfromskinandhairregionstolabelsforidentifyingtheobjectdependenciesandrejectingmanyoftheincorrectdecisions.Hereweusefacecolorcharacteristicsthathaveagoodresistanceagainstthefacerotationsandexpressions.Thisalgorithmisalsocapableofbeingcombinedwithothermethodsoffacerecognitionineachstagetoimprovethedetection.

简介：就共鸣器而言的戒指microresonator过滤器内部损失理论上被分析，它有一个输入端口和二个输出端口。为在microresonator和绝缘的波导之间的光力量联合的一些通用关系被介绍。在半最大值(FWHM)的过滤器带宽或完整的宽度的分析表情，免费光谱共鸣器的范围和灵巧被导出。戒指microresonator过滤器的特征数字地被讨论。戒指共鸣器的损失减少传播的山峰价值，这被表明，拓宽过滤器带宽，并且减少共鸣器过滤器的灵巧。

简介：影响在噪音特征上由拉曼效果导致了一弄空并且有损耗的双泵纤维光参量的放大器(FOPA)被调查。考虑拉曼效果，修改联合振幅方程第一被造，然后，拉曼的影响在Stokes和反上完成--司烧有不同起始的信号力量的波长进一步被分析。而且，FOPA获得上的效果也与一样的起始的信号力量和经常的噪音数字(NF)被显示出。

简介：TheshearlagtheoryisusedtoanalyzethestresstransferfromconcretematrixtoFBGsensorsbasedonthattheFBGsensorandtheconcretematrixarecomposite.Thestresstransferformulaandthecoefficientareobtained.Theexperimentsprovethatthetheoreticalresultsofthestresstransferbythestresstransferformulaareinwellagreementwiththeexperimentaldata.

简介：BasedonLucovskyequation,theresponsesolutionof1-Dpositionsensitivedetector(PSD)isgivenundertheconditionofparallellightobliqueincidenceandGaussianbeamobliqueincidence,andtheresponsecharacteristicsareanalyzedbynumericalcalculation.Therelationbetweenobliqueincidentangleandoutputcurrentisintroducedandillustrated.

简介：Asimpleandcompactmicrostrip-fedUltraWideBand(UWB)printedmonopoleantennawithband-notchedcharacteristicisproposedinthispaper.Theantennaiscomposedofasquareringwithasmallstripbar,sothattheantennaoccupiesabout7.69GHzbandwidthcovering3.11～10.8GHzwithexpectedbandrejectionfrom5.12GHzto5.87GHz.Aquasi-omnidirectionalandquasi-sym-metricalradiationpatternisalsoobtained.Thiskindofband-notchedUWBantennarequiresnoex-ternalfiltersandthusgreatlysimplifiesthesystemdesignofUWBwirelesscommunication.