简介：Theresistanceseenintotheportinann-cubeformedbytwoverticesofdistancen-1isexactlyformulatedforanyposiiveintegern.Theresistancesseenintotheportinann-cubeformedbyanytwoverticesisalsofoundbyexperimentsfor1≤n≤7.

简介：ThelowresistancePTCceramicthermistormaterialwithexcellenteleectricalpropertiesaresuccessfullyfabricatedbyrawmaterialsatindustrialrangemadeinourcountryonthestudyofitscompositionexpressionandfabricationprocessbyusingtheadditionofNb,La,Y,Ta,microstructureregulatorBNandASTLphase.Thecompositionanditsfabricationmethodarestudied.TherelationofelectricalpropertiesofthePTCceramicmaterialtoitscompositionexpressionanditsrelatedelectricalpropertiesarediscussed.

简介：Inrecentyears,microstripantennashavebeenmorewidelyappliedinsatellitecommunications,mobilephones,unmannedaerialvehicle(UAV),andweapons.Amicro-electro-mechanicalsystems-based(MEMS-based)high-resistancesiliconC-bandmicrostripantennaarrayhasbeendesignedfortheintelligentammunition.Thecenterfrequencyis4.5GHz.Acavityhasbeendesignedinsubstratetoreducethedielectricconstantofsiliconandhigh-resistancesiliconhasbeenusedasthematerialofsubstratetoimprovethegainofantenna.ItisveryeasytobemanufacturedbyusingMEMStechnologybecauseoftheimprovedstructureoftheantenna.Theresultsshowthatthegainoftheantennais8dBandvoltagestandingwaveratio(VSWR)islessthan2bytheanalysisandsimulationinhighfrequencystructuresimulator(HFSS).

简介：Normally,itisdifficulttodirectlymeasurethebandgapsofperovskitebasedonmethylammonium（MA）orformamidinium（FA）athightemperaturesduetomaterialdecomposition.Wepreventthedecompositionbykeepingthesynthesizedperovskitefilms（MAPbI3andMAPbI3）inorganiciodidevapors,thenmeasurethein-situresistanceofthefilmsatvariedtemperatures,andfurtherevaluatethebandgapsofthesetwomaterials.Theevaluatedbandgapsareconsistentwiththeresultsfromultraviolet-visible（UV-vis）absorptionspectrum.ThebandgapofMAPbI3decreaseswithtemperatureabove95℃,whereasthatofFAPbI3firstincreaseswithtemperaturefrom95℃to107℃andthendecreaseswithtemperatureabove107℃.