简介：Averticalantennaembeddedinearthwithconductivecoatinghasbeeninvesti-gatedbyemployingthemethodofintegralequation.ThistopicisavailabletoEM-MWD(Elec-tromagneticMeasurement-While-Drilling)system,whichisanewrealtimesystemfordrillingmeasurement.Undertheconditionthatthewavenumberoftheearthismuchlargerthanthatoftheair,acurrentintegralequationhasbeenderived.Afterthecurrentdistributionhavingbeendetermined,theelectricfieldstrengthontheearthsurfacehasbeenpredictedanditsdependencesontheoperatingfrequencyandthedepthofthewellhavebeendiscussedaswell.

简介：Ananalysissolutionofrateequationisderivedforverticalcavitysurface-emittinglasers.BasedontheenhancedspontaneousemissioncausedbyVCSELsandinfluenceofnonradiativerecombination,therelationbetweenoutputpropertiesandstructuralparametersofmulti-quantumwells(MQWs)isobtanined.Itwasfoundthatthecharacteristiccurveofa"thresholdless"laserisstronglynonradiativedepopulation-dependent.Whenthenonradiativedepopulationisnozero,thelight-currentcharacteristicisnotlinearlyevenforanidealclosedmicrocavity.Thelightoutputisincreasedbytheenhancedwellnumberandbythereducedwidth.Inparticular,alowerthresholdcurrentdensityforMQWsstructureintheshortcavityisrealizedbyus,meanwhilethesharpnessofthevariationdependsonspontaneousemissionfactor.

简介：Thispaperreportsawind-poweredwaterpumpingsystemimplementedinruralsideofPakistan.ThedesignmethodologypresentedinthispapershallenhancetheefficiencyoftheexistingSavoniusturbine’sperformancebymodifyingitaerodynamically.BladeswithdifferenttwistanglesaredesignedinSolidEdgeandanalyzedusingcomputationalfluiddynamics(CFD)withANSYSFLUENTsoftware.Staticandrotationalanalysesareperformedtogetoptimizedtwistangleandresultsarehighlighted.Theperformancesoftheturbineinbothstaticandrotationalanalysesarecompared.

简介：Amethodbasedonthetheoryoftransfermatrixtodesigntheintegratedmicrolensforthecollimationofvertical-cavitysurfaceemittinglaser(VCSEL)arrayispresented.Theintegratedmicrolensesfabricatedonthesubstratedirectlyandonacertainpolymermaterialwhichisonthesubstrateareconsidered.Therelationshipsbetweentheradiusofcurvature,beamwaistandthedivergenceangleaftercollimationareobtainedwiththehelpofZEMAX.Theresultsshowthatthedeviceswiththedivergenceangleof15°(1/e2)andbeamwaistof2μmcanbeimprovedtothosewiththedivergenceanglelowerthan1°,andthedeviceswithbeamwaistof10μmcanbeimprovedtothosewiththedivergenceanglelowerthan3°,whichisagoodreferenceformanufacturinghigh-powerdeviceswithsmalldivergenceangle.Theconclusionsincludingincreasingthethicknessesofboththesubstrateandpolymermaterialandreducingthediameterofoxidizedlayeraredrawn,whichwillbeanimportantguidanceforexperimentresearch.

简介：AnumericalschemesapplicabletothedirectsolutionofBoltzmanntransportequation(BTE)invertical-SOINMOSFETareinvestigatedbymeansofthefiniteelementanalysis(FEA).Thesolutiongivestheelectrondistributionfunction,electrostaticpotential,carriersconcentration,driftvelocity,averageenergyanddraincurrentbydirectlysolvingtheBTEandthePoissonequationself-consistency.TheresultshowsthatthedirectnumericalsolutionoftheBTEwiththeaidofFEAandverticalSOINMOSFETisapromisingapproachforultrashortchanneltransistorsmodeling.

简介：Theeffectofmesasizeonthethermalcharacteristicsofetchedmesavertical-cavitysurfaceemittinglasers(VCSELs)isstudied.ThenumericalresultsshowthatthemesasizeofthetopmirrorstronglyinfluencesthetemperaturedistributioninsidetheetchedmesaVCSEL.Underacertaindrivingvoltage,withdecreasingmesasize,thelocationofthemaximaltemperaturemovestowardsthep-contactmetal,thetemperatureinthecoreregionoftheactivelayerrisesgreatly,andthethermalcharacteristicsoftheetchedmesaVCSELswilldeteriorate.

简介：Monodispersed硅石有353nm的直径的微范围是在乙醇的装配intophotonic水晶在借助于可控制的垂直免职方法的不同温度和湿度的改变的硅石体积部分的胶体的暂停。表面形态学和光性质被SEM和UV-Vis-NIR学习。这被发现high-qualitysilica胶体的photonic晶体与在45℃和55℃之间的环境温度从乙醇答案被获得，在66%和76%之间的湿度，微范围的体积部分是between0.8%并且1.5%。可控制的垂直免职方法制作的订的拥挤不堪的photonic水晶在可见轻乐队和近红外线的乐队有二photonic乐队差距。