简介：Photoluminescenceevaluationofpandntype6H-SiCsampleshasbeendone.Resultsshowthatatlowtemperaturethephotoluminescenceof6H-SiCisclearlydominatedbydonor-acceptorpairtransitions,insomecase,free-to-donortransitioncouldbeobservedathighertemperature.Thethermalquenchingprocessesofthephotoluminescencehavebeeninvestigatedtodeterminethepossibleionizationnenergiesoftheimpurities.

简介：Intheopennetworkenvironment,maliciousattackstothetrustmodelhavebecomeincreasinglyserious.Comparedwithsinglenodeattacks,collusionattacksdomoreharmtothetrustmodel.Tosolvethisproblem,acollusiondetectorbasedontheGNalgorithmforthetrustevaluationmodelisproposedintheopenInternetenvironment.Byanalyzingthebehavioralcharacteristicsofcollusiongroups,theconceptofflattingisdefinedandtheG-Ncommunityminingalgorithmisusedtodividesuspiciouscommunities.Onthisbasis,acollusioncommunitydetectormethodisproposedbasedonthebreakingstrengthofsuspiciouscommunities.Simulationresultsshowthatthemodelhashighrecognitionaccuracyinidentifyingcollusionnodes,soastoeffectivelydefendagainstmaliciousattacksofcollusionnodes.

简介：Animprovedgeneticalgorithmforsearchingoptimalparametersinn-dimensionalspaceispresented,whichencodesmovementdirectionanddistanceandsearchesfromcoarsetoprecise.Thealgorithmcanrealizeglobaloptimizationandimprovethesearchefficiency,andcanbeappliedeffectivelyinindustrialoptimization,dataminingandpatternrecognition.

简介：ThisletterpresentsanewchunkingmethodbasedonMaximumEntropy(ME)modelwithN-foldtemplatecorrectionmodel.Firsttwotypesofmachinelearningmodelsaredescribed.Basedontheanalysisofthetwomodels,thenthechunkingmodelwhichcombinestheprofitsofconditionalprobabilitymodelandrulebasedmodelisproposed.Theselectionoffeaturesandruletemplatesinthechunkingmodelisdiscussed.ExperimentalresultsfortheCoNLL-2000corpusshowthatthisapproachachievesimpressiveaccuracyintermsoftheF-score:92.93%.ComparedwiththeMEmodelandMEMarkovmodel,thenewchunkingmodelachievesbetterperformance.

简介：Blindrecognitionofconvolutionalcodesisnotonlyessentialforcognitiveradio,butalsofornon-cooperativecontext.Thispaperisdedicatedtotheblindidentificationofratek/nconvolutionalencodersinanoisycontextbasedonWalsh-Hadamardtransformationandblockmatrix(WHT-BM).Theproposedalgorithmconstructsasystemofnoisylinearequationsandutilizesallitscoefficientstorecoverparitycheckmatrix.Itisabletomakeuseoffault-tolerantfeatureofWHT,thusprovidingmoreaccurateresultsandachievingbettererrorperformanceinhighrawbiterrorrate(BER)regions.Moreover,itismorecomputationallyefficientwiththeuseoftheblockmatrix(BM)method.

简介：AgeneralizedspectralGreen’sfunctionformulationofN-layersubstratestructureisgivenwiththreedimensionsources,whichisasetofclosedformformulas.Afull-waveanalysismodelforrectangularmicrostripantennascoveredwithN-dielectriclayershasbeenestablishedbyusingtheabovespectralGreen’sfunction.Theunknownsurfacecurrentdensityontheniicrostrippatchforsuchstructureisfoundasasolutionofanintegralequation.TheinputVSWRandradiationpatternsoftheantennaarealsoobtained.Thenumericalresultshavebeenverifiedbytheexperimentalresults.

简介：Coexistenceandinteroperabilitybetween20MHzand40MHzdeviceandmodesofop-erationsarestressedinstandardIEEE802.11nsystem.Itismandatetoreportthebothsub-channelsstatestoMediumAccessControl(MAC)atreceiver,sincefor40MHzdevice,itshouldservenotonly20MHzbutalso40MHzsignalsreceiving.Bothenergydetectionandcarriersenseareemployedtodetectchannelstate.Inthecaseof20/40Mmode,thepowerdifferencebetweenthetwosub-channelsisalsodetectedinordertoreportthechannelstateaccurately.Thesimulationresultsdemonstratethattheperformanceoftheproposedmethodsaremuchbetterthanthemethodswhichjustemployenergydetection.Besides,thesimulationresultsshowthattheproposedmethodsensurethatthechannelsensingisnotaroadblockofIEEE802.11nsystemdesign.

简介：TheanalysisofsolarcellperformancehasbeendonebysimulatingtheexternalI-Vcharacteristicsofn^+/p/p^+singlecrystalsiliconsolarcellunderhighlightintensityand1.5airmass(AM).Thismethodallowsthemaximizationofsolarcellefficiency.Tofabricatelow-costn^+/p/p^+singlecrystalsiliconsolarcells,solidsourceofdopedphosphorousandboronwasused.

简介：“检测技术全球先导”MIRTEC宣布凭借配置MIRTEC专有OMNI-VISION3D检测技术的创新M、7—92D／3D1n—LineAOI系列荣膺检测-AOI类”2012年全球科技大奖”。全新MV-92D／3DIn—LineAOI系统配置MIRTEC的创新OWNI—VISION3D检测技术，该技术将MIRTEC专有1，500万像素2DISIS视觉系统和专利3D数字多频Moire系统完美结合，旨在精确检测制成PCB组件上面的SMT元件。

简介：<正>Diodes公司推出同步MOSFET控制器ZXGD3104N8,其额定电压为25V,适用于90W及以上的笔记本和便携式电脑的电源设计。这款新品能取代返驰式转换器内效率较低的肖特基二极管,并通过减少多达70%的整流器损耗,有效提升最高达3.5%的电源效率。因此,该器件有助电源供应系统更容易达到能源之星V2.0所规定的电源平均效率需达到87%的评级要求。

简介：ThispaperinvestigatesthedesignofdigitalSigma-DeltaModulator(SDM)forfractional-Nfrequencysynthesizer.CharacteristicsofSDMsarecomparedthroughtheoryanalysisandsimulation.Thecurveofmaximum-loop-bandwidthvs.maximum-phase-noiseissuggestedtobeanewcriteriontotheperformanceofSDM,whichgreatlyhelpsdesignerstoselectanappropriateSDMstructuretomeettheirrealapplicationrequirementsandtoreducethecostaslowaspossible.Alow-spur3-orderMul-tistageNoiseShaping(MASH)-1-1-1SDMusingthree2-bitfirst-ordercascadedmodulatorsisproposed,whichbalancestherequirementsoftone-freeandmaximumoperationfrequency.

简介：ThemicrostructureandopticalpropertiesofaburiedlayerformedbyO+(200keV,1.8×1018/cm2)andN+(180keV,4×1017/cm2)co-implantationandannealedat1200℃for2hhavebeeninvestigatedbyAugerelectron,IRabsorptionandreflectionspectroscopicmeasurements.TheresultsshowthattheburiedlayerconsistsofsilicondioxideandSiOx（x<2）andthenitrogensegregatestothewingsoftheburiedlayerwhereitformsanoxynitride.BydetailtheoreticalanalysisandcomputersimulationoftheIRreflectioninterferencespectrum,therefractiveindexprofilesoftheburiedlayerwereobtained.

简介：<正>日前,VishayIntertechnology,Inc.宣布,其E系列器件新增650V功率MOSFET。新的E系列器件采用VishaySiliconix超级结技术,导通电阻低至30mΩ、电流达6A～105A,在8种封装中实现低FOM和高功率密度。

简介：ByanalyzingthemainrecombinationmechanismsinGaInAsSbmaterials,thedependencesofthedarkcurrentdensityandopencircuitvoltageinn+-pGaInAsSbthermophotovoltaiccellsontherecombinationparameters,carrierconcentrationandcellthicknessarecalculated.Theresultsshowthatthedarkcurrentmainlycomesfromp-region,anditisrelatedwiththesurfaceandAugerrecombinationsinlowandhighcarrierconcentrationranges,respectively.ThesurfaceandAugerrecombinationscanbesuppressedbyreducingthesurfacerecombinationvelocityandcarrierconcentration,respectively.Thedarkcurrentdensitycanbesuppressedbyoptimizingmaterialparametersanddevicesurfacepassivationtechnique.SothehighopencircuitvoltagecanbeobtainedforGaInAsSbthermophotovoltaiccells.

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：AwedgeshapeSiLEDisdesignedandfabricatedwith0.35μmdouble-gratingstandardCMOStechnology.ThedevicestructureisbasedontheN-well-P+junction.TheP+hasawedgeshapeandissurroundedbytheN-well.ThemicrographsofSiLEDs'emittingandlayoutarecaptured.TheI-VcharacteristicandspectraoftheSiLEDaretested.Underroomtemperatureandbackwardbias,itsradiantluminosityis12nWat100mA,andthewavelengthoftheemittingpeakislocatedat764nm.

简介：<正>美国Kyma公司新推出高掺杂n+型氮化镓体单晶衬底,尺寸为10´10mm-2和18´18mm-2,同时他们也正在研发直径2英寸的氮化镓衬底,下一步是进入量产阶段。这次Kyma新研制的高掺杂n型氮化镓衬底的电阻率小

简介：Cupricoxide(CuO)isconsideredtobeapromisingmaterialforphotovoltaicapplications.Inthispaper,p-CuO/n-Sijunctionsolarcellswereobtainedbythermaloxidationofmetalliccopperfilmsdepositedonn-Sisubstratesat400℃for5h.X-raydiffractionpatternsshowthattheas-preparedfilmsareCuOwithmonocliniccrystallinestructure.HalleffectmeasurementresultsshowthatCuOfilmsarep-typeconduction.Adirectband-gapof~1.57eVfortheCuOfilmisdeducedfromUV-VisAbsorbancespectra.SolarcellsofCu/p-CuO/n-Si/AlstructureshowthatitsphotovoltaicbehaviorhasamuchwiderspectrumresponsewidthcomparedwiththatofSisolarcells.Inaddition,thephotocurrentofCuO/n-SijunctionisinvestigatedasafunctionofCuOfilmthickness,anditisfoundthatthecriticalthicknessforCuOonSiisabout250nm.

简介：Average(mean)voterisoneofthecommonestvotingmethodssuitablefordecisionmakinginhighly-availableandlong-missionsapplicationswheretheavailabilityandthespeedofthesystemarecritical.Inthispaper,anewgenerationofaveragevoterbasedonparallelalgorithmsandparallelrandomaccessmachine(PRAM)structureareproposed.Theanalysisshowsthatthisalgorithmisoptimalduetoitsimprovedtimecomplexity,speed-up,andefficiencyandisespeciallyappropriateforapplicationswherethesizeofinputspaceislarge.

简介：Y＆D7200N桌上型自动点／涂胶机，外形紧凑，坚固耐用，可与胶阀、针筒搭配使用，适用于任何点胶应用的自动化，极其适用于成本考量和紧凑空间要求时应用。采用行业领先的软件通过示教盒按步骤指导用户操作的指示，数分钟内可完成复杂的点胶操作程序编写。