简介:摘要本文主要对建筑装饰施工技术和现场施工管理进行分析,希望对相关从业人员有所帮助。
简介:目的评估持续高频正弦波及方波频闪光对豚鼠眼球正视化及眼球发育的影响。方法30只2周龄豚鼠分为20Hz方波、20Hz正弦波频闪组及无频闪对照组共3组(n=10),光照强度统一为500lx,每2周测量豚鼠眼球屈光度、眼轴长度及曲率半径,第8周时对三组豚鼠行电生理闪光视网膜电图(F-ERG)检查,取出眼球后行病理评估组织学改变。结果3组豚鼠眼球屈光度与眼轴长度呈正相关,第8周时与对照组相比,20Hz正弦波频闪组及20Hz方波屈光度出现(-0.75±0.79)D及(-1.50±0.91)D近视性改变(P〈0.05),曲率半径3组间差异无显著性(P〉0.05),F-ERG潜伏期20Hz正弦波及20Hz方波频闪组a波延长了3.8s及7.9s,病理三组间组织学未见显著性差异。结论持续暴露于高频方波及正弦波频闪光一定程度上影响眼正视化。
简介:ADC/ACconverterforsingle-phasegrid-connectedphotovoltaicsystems-IECON'02;ANEWZVTDC-TO-DCFULLBRIDGECONVERTER;AThree-PhaseAC/ACHigh-FrequencyLinkMatrixConverterforVSCFApplications;Analysisofeffectiveresistanceandeddy-currentlossesinmultiturnwindingofhigh-frequencymagneticcomponents;Bi-polarityphase-shiftedcontrolledvoltagemodeAC/ACconverterswithhighfrequencyaelink;Contactlesspowerandinformationtransmission;
简介:摘 要:.本文结合教学实际,从高频功率放大电路的电路结构、与高频小信号放大器的区别和应用电路几个方面阐述了高频功率放大电路的教学设计。
简介:DoubletwoswitchforwardsoftswitchingPWMDC-DCconverter,Doubletwo-switchforwardtransformerlinkedsoft-switchingPWMDC-DCpowerconverterusingIGBTs,ExperimentalDeterminationofStrayCapacitancesinHighFrequencyTransformers,FullBridgeSoft-SwitchingPhase-ShiftedPWMDC-DCConverterusingTappedInductorFilter
简介:PerformanceevaluationonZCS-PFMseries-resonantDC-DCconverterwithhigh-frequencyhigh-voltagetransformerformagnetrondrive,Powersupplywithhighinsulationcapabilitytofeedelectronicsonthehighpotentialsideinpowerdistributionnetworks,Series-parallelresonantUPSwithcapacitiveoutputDCbusfilterforpoweringHFCnetworks,Soft-switchingphase-shiftedPWMfull-bridgeDC-DCconverterwithreducedconductionlossesnovelsoft-switchingDC-DCconverterusingtappedinductortypefilter,SynthesisandModulationofaSinglePhaseDC/ACConverterwithHigh-FrequencyIsolationinPhotovoltaicEnergyApplications,TransformerParasiticParametersandLosslessInductiveSnubberAssistedZeroCurrentSoftSwitchingDC-DCConverterforHighPowerMagnetronDrive。