简介：Inthispaper,anewresult,newformulasoftransferfunctionandinputimpedancefor2-Ddissipativereactancenetworkcascadesynthesisisgivenintermsofsimplifiedformulastorealizedoublyterminatedresistively1-Ddissipativereactancenetworks.Thenewresultincludesthemoregeneralcases,e.g.thebothcanbedissipativeoroneisdissipativeandtheanotherisalosslessreactancesubnetworkandsoon.Twocalculationexamplesaregiveninthepapertoillustratetheaboverealizations.Besides,consideringsomeproblemsofthedirectconnectionbetweentwosubnetworks,wealsointroduceone-waylinestodiscussthecascadesynthesisofnonreciprocal2-Ddissipativereactancenetworks.

简介：基于夫妇波浪方程和有限差别的时间域(FDTD)算法，2-Dphotonic水晶couplers的强壮的夫妇特征被计算。理论分析和数字模仿的结果显示在2-Dphotonic水晶coupler的精力不能完全在二波导之间被转移。与弱联合理论的结果相比，我们的结果是更精确的。CLC数字TN252文件代码A由福建省(2001J008)的青春科技革新条款基础支持了

简介：用photonic晶体(PC)，轻射出的二极管(LEDs)的抽取效率能被photonic乐队差距(PBG)和栅栏衍射的效果极大地提高。二个理论方法也被讨论。同时，我们证明LEDs能由作为衍射栅栏采用photonic水晶完成高抽取效率。有圆柱的单位房间的方形的格子的PC被制作在轧了带的基于陷阱的蓝色的层。我们在场PC-LED的抽取效率的理论讨论，它依靠有效中等理论和传播矩阵方法调查格子常数的效果。当格子常数是270nm时，结果证明高效LEDs的抽取效率能完成61.8%。

简介：AnewcompactopticalFanofiltersuitableforbiologicalsensingisproposed,whichpatternsphotoncrystalinsinglecrystallinesiliconnanomembranes(SiNMs)andtransferringontotransparentglasssubstrates.Theeffectsofairholesizeandsiliconthicknessonthetransmissioncharacteristicsofnewfilterarenumericallyinvestigatedbyusingthree-dimensionalfinite-differencetime-domain(FDTD)technique,thespectralresponseisalsostudiedbyback-fillingbioliquid.Theresultsshowthatthedipwavelengthwillshifttowardlongerwavelengthbyeitherreducingairholeradiusorfillingbio-liquid.Thenumberofdipswillincreasewiththeincreaseofsiliconthickness.Thesizeofproposedfiltercanbelessthan1mm2.

简介：Videoobjectextractionisakeytechnologyincontent-basedvideocoding.AnovelvideoobjectextractingalgorithmbytwoDimensional(2-D)mesh-basedmotionanalysisisproposedinthispaper.Firstly,a2-Dmeshfittingtheoriginalframeimageisobtainedviafeaturedetectionalgorithm.Then,higherorderstatisticsmotionanalysisisappliedonthe2-Dmeshrepresentationtogetaninitialmotiondetectionmask.Afterpost-processing,thefinalsegmentingmaskisquicklyobtained.Andhencethevideoobjectiseffectivelyextracted.Experimentalresultsshowthattheproposedalgorithmcombinesthemeritsofmesh-basedsegmentingalgorithmsandpixel-basedsegmentingalgorithms,andherebyachievessatisfactorysubjectiveandobjectiveperformancewhiledramaticallyincreasingthesegmentingspeed.

简介：TheproblemsofcharacteristicpolynomialassignmentinFomasini-Marchesini(F-M)modelⅡof2-Dsystemsareinvestigated.Thecorrespondingclosed-loopsystemsdescribedbyF-MmodelIIareobtainedviathestatefeedback.Usingthealgebraicgeometrymethod,thecharacteristicpolynomialassignmentinthedosed-loopsystemsisdiscussed.Intermsofthetheoryofalgebraicgeometry,theproblemofcharacteristicpolynomialassignmentistransferredtotheonewhetherarationalmappingisonto.SufficientconditionsforalmostarbitraryassignmentcoefficientsofcharacteristicpolynomialinF-MmodelⅡof2-Dsystemsviastatefeedbackarederived,andtheyareavailableformulti-inputcases.Italsohasbeenshownthatthismethodcanbeappliedtoassignthecharacteristicpolynomialwithoutputfeedback.Thesufficientconditionsforalmostarbitraryassignmentcoefficientsofcharacteristicpolynomialofmulti-input2-DsystemsdescribedbyF-MmodelⅡwithoutputfeedbackareestablished.

简介：Itisrevealedthatthedynamicstabilityof2-Drecursivecontinuous-discretesystemswithintervalparametersinvolvestheproblemofrobustHurwitz-Schurstabilityofbivariatepolynomialsfamily.ItisprovedthattheHurwitz-Schurstabilityofthedenominatorpolynomialsofthesystemsisnecessaryandsufficientfortheasymptoticstabilityofthe2-Dhybridsystems.The2-Dhybridtransformation,i.e.2-DLaplace-Ztransformation,hasbeenproposedtosolvethestabilityanalysisofthe2-Dcontinuous-discretesystems,togetthe2-Dhybridtransferfunctionsofthesystems.TheedgetestfortheHurwitz-Schurstabilityofintervalbivariatepolynomialsisintroduced.TheHurwitz-Schurstabilityoftheintervalfamilyof2-Dpolynomialscanbeguaranteedbythestabilityofitsfiniteedgepolynomialsofthefamily.Analgorithmaboutthestabilitytestofedgepolynomialsisgiven.

简介：Thispaperpresentsanewarraystructureforestimatingtwo-dimensional(2-D)direction-of-arrivals(DOAs).ThestructureiscalledY-shapedarray,whichhas10%betteraccuracypotentialthanthenewly-developedL-shapedarray.Agreatmeritisitsabilitytoestimate2-DDOAswhicheverdirectionsthearrivingsignalscomefrom,comparedwithL-shapedarraywhoseperformancedependsonDOAs.Simulationresultsaregiventodemonstratetheperformanceofthenewarray.

简介：Intersil公司日前宣布它已签署了一项收购D2Audio公司的最终协议，后者是一家专门致力于为消费电子、汽车以及专业音频产品等应用领域提供数字音频功率放大器设计的创新领先厂商。至此，Intersil公司成为全球独家拥有智能数字音频功率放大器技术的厂商。

简介：有了星友提供的故障原因，笔者下手自然就不会再通电测试了，而是直接拆机检查。

简介：Thispaperproposesanewtechniquethatisusedtoembeddepthmapsintocorresponding2-dimensional(2D)images.Sincea2Dimageanditsdepthmapareintegratedintoonetypeofimageformat,theycanbetreatedasiftheywereone2Dimage.Thereby,itcanreducetheamountofdatain3Dimagesbyhalfandsimplifytheprocessesforsendingthemthroughnetworksbecausethesynchronizationbetweenimagesfortheleftandrighteyesbecomesunnecessary.Weembeddepthmapsinthequantizeddiscretecosinetransform(DCT)dataof2Dimages.Thekeytothistechniqueiswhetherthedepthmapscouldbeembeddedinto2Dimageswithoutperceivablydeterioratingtheirquality.Wetrytoreducetheirdeteriorationbycompressingthedepthmapdatabyusingthedifferencesfromthenextpixeltotheleft.Weassumethatthereisonlyonenon-zeropixelatmostononehorizontallineintheDCTblockbecausethedepthmapvalueschangeabruptly.Weconductanexperimenttoevaluatethequalityofthe2Dimagesembeddedwithdepthmapsandfindthatsatisfactoryqualitycouldbeachieved.

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简介：Analternativemethodisproposedinthisletterfordescribingthearbitraryshapeandsizeforgranulesin2Dimage.Afterimagebinarization,theedgepointsoncontouraredetected,bywhichthecentroidoftheshapeinquestionissoughtusingthemomentcalculation.UsingPrincipalComponentAnalysis(PCA),themajorandminordiametersarecomputed.Basedonthesignaturecurve-fitting,thefirst-orderderivativeistakensoastoseekallthecharacteristicvertices.Byconnectingtheverticesfound,thesimplifiedpolygonisformedandutilizedforshapeandsizedescriptivepurposes.Thedevelopedalgorithmisrunontwogivenrealparticleimages,andtheexecutionresultsindicatethatthecomputedparameterscantechnicallywelldescribetheshapeandsizefortheoriginalparticles,beingabletoprovideaready-to-usedatabaseformachinevisionsystemtoperformrelateddataprocessingtasks.

简介：Microchip日前宣布推出一款新型2D触摸表面软件库，设计人员能够使用该公司的8位PIC和AVR单片机（MCU）以及32位SAMMCU轻松实现触摸板。购买任何兼容的MCU均可免费获得这一软件库，它为嵌入式应用提供了简单的低成本解决方案。

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简介：AmeasurementsystemwiththeCCDmatrixandcomputersystemisdesignedtotestthe2Dsizeofanyshapeworkpiecesautomatically.Inaddition,thesystemadoptsthemethodoftherelativemeasurementwhichincreasestheprecisionandthevelocity.Moreimportantly,theprecisioncan'tbechangedwiththeconditionsofthetemperatureandairpressure.Theexperimentsshowthattherelativeprecisionof0.0029andtheabsoluteprecisionof2.97μmareobtained.Theinstrumentmaybeusedintheproductlineandmakethetestingonlinepossible.

简介：A2D-directionofarrivalestimation(DOAE)formultiinputandmulti-output(MIMO)radarusingimprovedmultipletemporal-spatialsubspacesinestimatingsignalparametersviarotationalinvariancetechniquesmethod(TS-ESPRIT)isintroduced.InordertorealizetheimprovedTS-ESPRIT,theproposedalgorithmdividestheplanararrayintomultipleuniformsub-planararrayswithcommonreferencepointtogetaunifiedphaseshiftsmeasurementpointforallsub-arrays.TheTS-ESPRITisappliedtoeachsub-arrayseparately,andinthesametimewiththeotherstorealizetheparallellytemporalandspatialprocessing,sothatitreducesthenon-linearityeffectofmodelanddecreasesthecomputationaltime.Then,thetimedifferenceofarrival(TDOA)techniqueisappliedtocombinethemultiplesub-arraysinordertoformtheimprovedTS-ESPRIT.Itisfoundthattheproposedmethodachieveshighaccuracyatalowsignaltonoiseratio(SNR)withlowcomputationalcomplexity,leadingtoenhancementoftheestimatorsperformance.

简介：据《每日科学》报道,来自肯塔基大学、德国戴姆勒公司及希腊电子结构和激光研究所（IESL）的科学家们合作发现了一种单原子厚度的新型平面材料,该材料可替代石墨烯材料,并将推动数字技术的进步。尽管现在石墨烯备受瞩目,被认为是世界上最强韧的材料,但却有一个显见的不足——它不是半导体,这对其在数字产业的应用来说无疑是个打击。新材料由硅、硼、氮元素组成,3种元素都有重量轻、价格低、储量大的优点。此外,

简介：Wetheoreticallypresenttheintrinsiclimitstoelectronmobilityinthemodulation-dopedAlGaN/GaNtwo-dimensionalelectrongas(2DEG)duetoeffectsincludingacousticdeformationpotential(DP)scattering,piezoelectricscattering(PE),andpolar-opticphononscattering(POP).WefindthatDEandPEarethemoresignificantlimitingfactorsatintermediatetemperaturesof40Kto250K,whilePOPbecomesdominantasroomtemperatureisapproached.Detailednumericalresultsarepresentedforthechangeofelectronmobilitywithrespecttotemperatureandcarrierdensity.Weconcludethatthesethreetypesofphononscattering,whicharegenerallydeterminedbythematerialpropertiesbutnotthetechnicalprocessing,arehardlimitstothe2DEGmobility.