简介:Thestudyofcycliccodesoverringshasgeneratedalotofpublicinterest.Inthispaper,westudycycliccodesandtheirdualcodesovertheringZP2oflengthpe,andfindasetofgeneratorsforthesecodes.Theranksandminimalgeneratorsetsofthesecodesarestudiedaswell,whichplayanimportantroleindecodinganddeterminingthedistancedistributionofcodes.
简介:<正>VishayIntertechnology公司日前宣布推出采用小型PowerPAK1212—8封装的业界首款200V功率MOSFET器件。该器件封装的面积为3.3mm×3.3mm,高度仅为1.07mm,其在提供极为卓越的热性能的同时提供了比SO—8解决方案更小的尺寸。PowerPAK1212—8封装的功率消耗为3.8W,几乎是任何具有TSSOP—8封装尺寸或更小尺寸的MOSFET器件的两倍。该封装典型的热阻仅为1.9℃/W,而SO—8的为16℃/w。除空间节约及其高电压性能外,Si7820DN还具备240mΩ的导通电阻和12.1nC的栅极电荷。新型功率MOSFET的工作结温和存放温度范围规定为—55℃~+150℃。
简介:RamanscatteringspectroscopyisappliedtoinvestigatethephononmodesinGaxIn1-xP(x=0.52)and(AlxGa1-x)0.51In0.49P(x=0.29)alloys.Two-modebehaviorinGaxIn1-xPandthree-modebehaviorin(AlxGa1-x)0.51In0.49Pareobserved.InorderedGaxIn1-xP,weclearlydistinguishtheTO1(GaP-like)modeandthesplittingofLO1(GaP-like)andLO2(InP-like)modes,whichisbelievedtobetheresultofsuperlatticeeffectofordering,andtheLO1+LO2mode,whichisobservedforthefirsttime.Inadditiontotheb/aratio,it'sfoundthattherelativeintensityoftheFLAandtheLO1+LO2modesalsocorrespondstothedegreeoforder.TheTO1andthesplittingofLO1andLO2devotetogethertothereductionofthe'valleydepth'.In(AlxGa1-x)0.51In0.49P,thedoublingofFLAisobserved.DuetotheinfluenceofAlcomposition,theGaP-likeLOmodebecomesashoulderoftheInP-likeLOmode.TheunresolvedRamanspectraindicatetheexistenceoforderedstructurein(AlxGa1-x)0.51In0.49Palloys.