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

  • 标签: BJFET 计算机模拟 双极晶体管 阻塞特征
  • 简介:Inthispaperthepressure-magneto-electriceffectofJunctionFieldEffectTransistor(JFET)isdiscussedbyusingstandardrelaxationtechniques.AtheoreticalevaluationofthepressuresensitivityandHallsensitivityofthen-channelsiliconJFETwithvariousgeometries(W/L),gatevoltages(VFS)anddrainvoltages(VDS)ismade.TheresultsshowthatwhenP≠0,B=0,thecurrent-pressuresensitivityisabout2.5%.cm2/N,supposingW/L(?)1/2-1.Basedonthat,ajunctionfieldeffectpressuresensorwithhighstabilityandlownoiseisdesigned.

  • 标签: Tensoresistive EFFECT of JFET Pressure-magneto-electric EFFECT
  • 简介:Theoutputcharacteristicsofphase-shiftedlong-periodfibergratings(LPGs)areanalyzedusingtransfermatrixmethod.Thetransmissionsandtheirenvelopsofseveralkindsofthesegratingsaregiven.Thecharacteristicsofphase-shiftedLPGsandBragggratingsarecompared.Thepossibleapplicationsofphase-shiftedLPGsarediscussed..

  • 标签: 光栅 转移矩阵 带通滤波器 相移
  • 简介:Withthevigorousexpansionofnonlinearadaptivefilteringwithreal-valuedkernelfunctions,itscounterpartcomplexkerneladaptivefilteringalgorithmswerealsosequentiallyproposedtosolvethecomplex-valuednonlinearproblemsarisinginalmostallreal-worldapplications.ThispaperfirstlypresentstwoschemesofthecomplexGaussiankernel-basedadaptivefilteringalgorithmstoillustratetheirrespectivecharacteristics.ThenthetheoreticalconvergencebehaviorofthecomplexGaussiankernelleastmeansquare(LMS)algorithmisstudiedbyusingthefixeddictionarystrategy.ThesimulationresultsdemonstratethatthetheoreticalcurvespredictedbythederivedanalyticalmodelsconsistentlycoincidewiththeMonteCarlosimulationresultsinbothtransientandsteady-statestagesfortwointroducedcomplexGaussiankernelLMSalgonthmsusingnon-circularcomplexdata.Theanalyticalmodelsareabletoberegardasatheoreticaltoolevaluatingabilityandallowtocomparewithmeansquareerror(MSE)performanceamongofcomplexkernelLMS(KLMS)methodsaccordingtothespecifiedkernelbandwidthandthelengthofdictionary.

  • 标签: LMS算法 收敛性分析 算法理论 高斯核 内核 自适应滤波算法
  • 简介:Inthisletter,atheoreticalmodelofradiation-balanceddoublecladfiberlaserispresented.ThecharacteristicofthelaserwithYbdopeddoublecladfiberisanalyzednumerically.Itisconcludedthathighoutputlaserpowercanbeobtainedbyselectingoutputcouplingmirrorwithlowerreflectivity,improvingYbdopedconcentrationandchoosingfiberlength.Thisresultcanhelpustodesignradiationbalancedfiberlaser.

  • 标签: 光纤器件 激光技术 理论分析 能量反射 辐射平衡
  • 简介:基于飞机波浪方法,有在x-y飞机的45°的全部格子旋转的木柴堆结构photonic水晶的完全的禁止的乐队的光性质理论上以height-to-pitch比率,充满的因素,和旋转角度被学习。计算结果证明到中间差距的比率的差距随着充满的部分从0.25~0.30稍微变化。最佳height-to-pitch比率是大约1.3。当旋转角度与1.3的经常的height-to-pitch比率从42°从40°增加到50°和最大的差距到为旋转角度未改变的0.2个遗体的中间差距的比率到48°时,到中间差距的比率的差距到达超过0.18。当height-to-pitch比率是1.3时,到中间差距的比率的差距到达0.2的最大的价值。这木柴堆类型photonic晶体能在一个更宽的参数范围以内提供大乐队差距,它使在实验室生产三维的photonic晶体方便。

  • 标签: 晶体 平面波方法 禁用波段 木料堆结构
  • 简介:Thetheoreticalexpressionoftherelationshipbetweenoptimumdopingcontentandcrystalstructureispresentedaswellasthepreparationmethods.Byusingthisexpression,theoptimumdopingcontentofsilicon-dopedboroncarbidethinfilmiscalculated.Thequantitativecalculationvalueisconsistentwiththeexperimentalresults.Thistheoreticalexpressionisalsoappropriatetoresolvetheoptimumdopingcontentforotherelectricmaterials.

  • 标签: 热电材料 碳化硼薄膜 晶体结构 添加剂
  • 简介:TimedomainABCDmatrixformalismisausefulmodelforanalyzingthecharacteristicsofactivelymodelockedfiberlaser.Basedonthismodelandgivenmoreconsiderationontheinfluencesofopticalfiberdispersionandopticalfibernonlinearity,thelasercharacteristicofactivelymodelockedfiberlaserisanalyzed,andthecomparisionofthetheoreticalanalysisresultswithexperimentalonesisgiven.

  • 标签: 光纤传播 非线性 激光器 锁模光纤
  • 简介:Theadaptiveoptics(AO)technologywithoutawave-frontsensorissimpleandhasmoreapplicationfieldsthanconventionalAOtechnologies.ThetheorybasisoftheAOsystembasedonstochasticparallelgradientdescent(SPGD)fromtheconvergence,thestability,andtheaveragedconvergencerateisanalyzed,whereSPGDisusedtocontroltheAOsystem.TheresultsshowthattheAOsystembasedonSPGDcanobtaingoodconvergenceandstability,andthefastconvergencerate,whichisininverseproportionton(nisthenumberofcontrolparameters).

  • 标签: 自适应光学系统 梯度下降算法 并行 随机 收敛速度 控制参数
  • 简介:Atheoreticalmodelinthe1900nmwavebandforamplifiedspontaneousemission(ASE)ofthulium-dopedsilicafiberispresented.TheASEspectralpowerasfunctionsofthefiberlengthandthepumppowerisinvestigatedbysolvingtherateandpropagationequations.Bycalculation,whentheconcentrationofthuliuminfiberis2.25×1025m-3,thefibercorediameteris2.6μm,andthepumppoweris200mWat808nm,theoptimalfiberlengthis8.1m,andtheoutputpowerofASEcanreach60mWintherangeof1800-1950nmwiththisfiberlength.Theoptical-to-opticalconversionis30.3%.Theoptimalpumppoweralsocanbeobtainedbythismodel.

  • 标签: 石英光纤 米波段 月光 模型 稀土 放大自发辐射
  • 简介:Fiber-opticMach-Zehnderinterferometer(MZI)canbeusedaswavelength-multiplexersanddemultiplexers.The△Land△φdirectlyinfluencethepropertiesofMZI.Tolengthenthe△Lcandemultiplexmuchmorewavelengths,butwhenthe△Lislonger,thetemperaturewillinfluenceMZImoreseriously.Amethodtosolvethisproblemisproposed,whichenablesMZItoworkstably.Thewavelengthdistanceis0.8nm,andtheextinctionratioishigh.

  • 标签: MACH-ZEHNDER INTERFEROMETER COUPLER Wavelength MULTIPLEXERS and