简介:srzn2(PO4)2:在大气中的高温固相反应合成Sm3+荧光粉。srzn2(PO4)2:Sm3+荧光粉是通过紫外光有效激发(UV)和蓝色光,和发射峰被分配到2-6h54G5//2过渡(563nm),2-6h74G5//2(597nm和605nm)和2-6h94G5//2(644nm和653nm)。对srzn2发射强度(PO4)2:Sm3+的Sm3+浓度的影响,其浓度猝灭效应srzn2(PO4)2:钐也观察到。当掺杂离子(=Li,Na和K)离子的发光强度,srzn2(PO4)2:Sm3+可以明显增强。在国际照明委员会(CIE)的srzn2色坐标(PO4)2:Sm3+定位在橙红色的区域。结果表明,该荧光粉具有潜在的应用在白光发光二极管(LED)。
简介:AnapproximationalgorithmispresentedforaugmentinganundirectedweightedgraphtoaK-edge-connectedgraph.Thealgorithmisusefulfordesigningareliablenetwork.
简介:InviewofK-faulttestability,thetopologicalconstructionofapracticalcircuitisfarfromideal.Inordertoimprovethetestabilityofacircuit,wemayincreasethenumberofaccessiblenodesorusethemulti-excitationmethod.Effectivenessofthesemethodsandthefeasibilityofchoosingaccessiblenodesarediscussedindetail.Theconditionsformulti-excitationtestabilityarepresented.
简介:Blindrecognitionofconvolutionalcodesisnotonlyessentialforcognitiveradio,butalsofornon-cooperativecontext.Thispaperisdedicatedtotheblindidentificationofratek/nconvolutionalencodersinanoisycontextbasedonWalsh-Hadamardtransformationandblockmatrix(WHT-BM).Theproposedalgorithmconstructsasystemofnoisylinearequationsandutilizesallitscoefficientstorecoverparitycheckmatrix.Itisabletomakeuseoffault-tolerantfeatureofWHT,thusprovidingmoreaccurateresultsandachievingbettererrorperformanceinhighrawbiterrorrate(BER)regions.Moreover,itismorecomputationallyefficientwiththeuseoftheblockmatrix(BM)method.
简介:Higher-orderalmostcyclostationarycomplexprocessesarecomplexrandomsignalswithalmostperiodicallytime-varyingstatistics,whichisimportanttotheresearchofnon-Gaussiansignalsininformationsystem.Intinspaper,smoothedpolyperiodogramsareproposedforrelatedtocyclicpolyspectralestimationandareshowntobeconsistentandasymptoticallycomplexnormal.Asymptoticcovarianceexpressionsarederivedalongwiththeircomputableforms.
简介:Anovelfibergratingvibrationdemodulationsystem,basedon2×2and3×3couplers,isdesigned.Basedonthephaseunwrappingalgorithm,thethree-wayasymmetricaloutputofthe3×3coupleranddemodulationstatecharacteristicsofthesystemwhenthevibrationsignalincludeshighharmonicwavesareanalyzedinsimulations.Theresultshowsthatwhenthethree-wayoutputisasymmetrical,themaximumdeviationofdemodulationsignalis1.625%,andwhenthevibrationsignalincludeshighharmonicwaves,themaximumdeviationofdemodulationsignalis0.9%.Thecorrespondingexperimentisconducted.Theexperimentalresultshowsthatthedynamicresolutionofthesystemis25.22nε/Hzwhenthevibrationpitchis5.5Hz.
简介:Forenhancingthe2.0μmbandfluorescenceofHo3+,acertainamountofWO3oxidewasintroducedintoHo3+/Tm3+/Yb3+tri-dopedtelluriteglasspreparedusingmelt-quenchingtechnique.Thepreparedtri-dopedtelluriteglasswascharacterizedbytheabsorptionspectra,fluorescenceemissionandRamanscatteringspectra,togetherwiththestimulatedabsorption,emissioncross-sectionsandgaincoefficient.TheresearchresultsshowthattheintroductionofWO3oxidecanfurtherimprovethe2.0μmbandfluorescenceemissionthroughtheenhancedphonon-assistedenergytransfersbetweenHo3+/Tm3+/Yb3+ionsundertheexcitationof980nmlaserdiode(LD).Meanwhile,themaximumgaincoefficientofHo3+at2.0μmbandreachesabout2.36cm-1.Anintense2.0μmfluorescenceemissioncanberealized.
简介:Comparedwithaccuratediagnosis,thesystem’sselfdiagnosingcapabilitycanbegreatlyincreasedthroughthet/kdiagnosisstrategyatmostkvertexestobemistakenlyidentifiedasfaultyunderthecomparisonmodel,wherekistypicallyasmallnumber.BasedonthePreparata,Metze,andChien(PMC)model,then-dimensionalhypercubenetworkisprovedtobet/kdiagnosable.Inthispaper,basedontheMaengandMalek(MM)?model,anovelt/k-faultdiagnosis(1k4)algorithmofndimensionalhypercube,calledt/k-MM?-DIAG,isproposedtoisolateallfaultyprocessorswithinthesetofnodes,amongwhichthenumberoffault-freenodesidentifiedwronglyasfaultyisatmostk.ThetimecomplexityinouralgorithmisonlyO(2nn2).
简介:Lanthanidehasattractedmuchattentioninthefieldofopticalcommunicationsinrecentyears.SomepropertyanalysesonopticalwaveguideofNd-dopedcrystalNdxY1-xAl3(BO3)4andNd:MgO:LiNbO3aremadeinthispaper,followedbyintroductionofthemethodsofexperimentationandtheoreticalcalculationfortheplanaropticalwaveguides.Therefractiveindexprofilesoftheopticalwaveguidesareanalyzed.Theaboveworkoffersusefulinformationforstudyonnewtypematerialsforopticalcommunications.