简介：在量信息处理，在吵闹的环境保护qubits的连贯是重要的。动态去耦(DD)它使用一个序列在qubits上扭动并且平均联合到零的qubit环境，是有另外的需要的功能的有希望的策略兼容机，例如量门。这里，我们在动态去耦和试验性的示范的理论考察最近的进步。我们由于联合到吵闹的环境给半古典作品和对qubit的量描述decoherence。基于量图画，DD的几何解释被介绍。周期的Carr-Purcell-Meiboom-GillDD和并置的DD被考察，由最近发达的UhrigDD的详细探索列在后面，它采用脉搏的最少的数字在一不相等地压制联合到进化时间的一个给定的命令的qubit环境的spaced顺序。一些新开发和观点也被讨论。

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简介：IntroductionSomewritingisgoodinsentencestructurebuteitherpoorincoherenceorincohesion.Theproblemofcoherenceisthatthesequenceofinformationisnotalwaysclearandtheproblemofcohesionisthatthesequenceofinformationisacceptable,whiletheconnectionbetweenitisnotsogood.Thequestionishowtoanalyzeandimprovethesedifferentweaknessinwriting.Wehavetwomethods.Onetofocusoncoherence,theothertofocusoncohesion.Inthisessay,themethodusedisbasedontheprinciplethatcoherenceandcohesionshouldworktogether.Iusethisapproachasatooltoeditanddisplaytheanalysisofcoherenceandcohesioninthepassageentitled’Father&Son".ThispassageispresentedasaguidedwritingexerciseinCollegeEnglishCourse,IntensiveReading,Band3,p271.

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简介：Wemeasuretheelectromagneticdegreeoftemporalcoherenceandtheassociatedcoherencetimeforquasi-monochromaticunpolarizedlightbeamsemittedbyanLED,afilteredhalogenlamp,andamultimodeHe–Nelaser.ThemethodisbasedonobservingattheoutputofaMichelsoninterferometerthevisibilities(contrasts)oftheintensityandpolarization-statemodulationsexpressedintermsoftheStokesparameters.Theresultsareingoodagreementwiththosededuceddirectlyfromthesourcespectra.Themeasurementsarerepeatedafterpassingthebeamsthroughalinearpolarizersoastoelucidatetheroleofpolarizationinelectromagneticcoherence.Whilethepolarizervariestheequal-timedegreeofcoherenceconsistentlywiththetheoreticalpredictionsandalterstheinnerstructureofthecoherencematrix,thecoherencetimeremainsalmostunchangedwhenthelightvariesfromunpolarizedtopolarized.Theresultsareimportantintheareasofapplicationsdealingwithphysicalopticsandelectromagneticinterference.

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简介：AimingtosolvethemisclassificationproblemsofunsupervisedpolarimetricWishartclassificationalgorithmbasedonFreemandecomposition,anunsupervisedPolarimetricSyntheticApertureRadar(SAR)Interferomery(PolInSAR)classificationalgorithmbasedonoptimalcoherencesetparametersisstudiedandproposed.ThisalgorithmusestheresultofFreemandecompositiontodividetheimageintothreebasiccategoriesincludingsurfacescattering,volumescattering,anddouble-bounce.Then,thePolInSARoptimalcoherencesetparametersareusedtofinelydivideeachofthethreebasiccategoriesinto9categories,andthewholeimageisdividedinto27categories.BecauseboththeFreemandecompositionresultandoptimalcoherencesetparametersindicatespecificscatteringcharacteristics,thewholeimageismergedinto16categoriesbasedonphysicalmeaning.Atlast,theWishartclusterisemployedtoobtainthefinalclassificationresult.Topreservethepurityofscatteringcharacteristics,pixelswithsimilarscatteringcharacteristicsarerestrictedtobeclassifiedwithotherpixels.Thefinalclassificationresultseffectivelyresolvethemisclassificationproblem,notonlythebuildingscanbeeffectivelydistinguishedfromvegetationinurbanareas,butalsotheroadiswelldistinguishedfromgrass.Inthispaper,theE-SARPolInSARdataofGermanAerospaceCenter(DLR),areusedtoverifytheeffectivenessofthealgorithm.

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简介：Thechangesintheiridocornealanglestructureduringaccommodationareassessedbymeansofanteriorsegmentopticalcoherencetomography.Thirteenrighteyeswereincludedinthestudy.ThedeviceusedforthemeasurementwastheVisante?omnisystem.Thestimuliweresetupatdifferentvergences(0.0D,-1.5D,and-3.0D).Theangleopeningdistance500and750,thetrabecularirisspacearea500and750,andthescleralspurangleparameterswereassessedatthenasalandtemporalregions.Theresultsintheiridotrabecularanglecomparingthethreeaccommodativestatesoftheeyedidnotyieldanystatisticallysignificantdifferenceatnasalortemporalanglesections.Inlightofourresultsandintheconditionsofourstudy,thestructuresoftheiridocornealanglearenotsignificantlychangedwithaccommodation.

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简介：Asimplifiedwaytocomputemultiplecoherencefunction,partialcoherencefunction,partialmultiplecoherencefunction,aswellasalltypesofcoherentoutputspectraarededucedinthispaperbyapplyingmultivariatelinearregressiontheorytomultiplecoherenceanalysis.Theconceptof"residualcrossspectrum"isavoided.Theformulasaresimpleandeasytobeprogrammed.Theproblemsinnoisesourceidentificationbypartialcoher-encefunctionarediscussed.Theresultsfornoisesourceidentificationinasimulatedmodelaregiven.

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简介：Thecoherenceisameasurefortheaccuracyoftheinterferometricphase,andthesyntheticapertureradar(SAR)interferometriccoherenceisaffectedbyseveralsourcesofthedecorrelationnoise.ForthecircularSAR(CSAR)imaginggeometry,thesystemresponsefunctionisintheformoftheBesselfunctionwhichbringsahighsidelobe,andthehighsidelobeofCSARwillbeanimportantfactorinfluencingtheinterferometriccoherence.Theeffectofthehighsidelobeonthecoherenceisanalyzedanddeduced.BasedontheinterferometriccharacteristicsoftheslightdifferenceintheviewinganglesandthepotentialpixeloffsetintheinterferometricSAR(InSAR)images,arelationbetweentheradarimpulseresponseandthecoherencelossfunctionisderived.Fromtherelationalmodel,thecoherencelossfunctionduetothehighsidelobeofCSARisthendeduced,andcomparedwiththatoftheconventionalSAR.ItisshownthatthehighsidelobeofCSARfocusingsignalwillseverelyaffectthebaselinedecorrelationandcoregistrationdecorrelation.SimulationresultsconfirmthetheoreticalanalysisandquantitativelyshowthebaselineandcoregistrationdecorrelationdegradationduetothehighsidelobesofCSAR.

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简介：Thispaperstudiestheentanglementpropertiesinasystemoftwodipole–dipolecoupledtwo-levelatomsresonantlyinteractingwithasingle-modethermalfield.Theresultsshowthat,whenthetemperatureofthecavityishighenough(correspondingtothelargevalueofthemeanphotonnumber),theentanglementisgreatlyenhancedduetotheinitialatomiccoherence.Theseresultsarehelpfulforcontrollingtheatomicentanglementbychangingtheinitialparametersofthesystem.

简介：Acoherence-basedcorrectionmethodwasproposedinordertoimprovethelateralresolutionandenhancethecontrastofmedicalultrasoundimaginginthepresenceofphaseaberration.Theaveragedcoherencefactorwasproposedatfirstandusedasametrictoevaluatephaseaberrationcorrection.Bymaximizingtheaveragedcoherencefactor,thetimedelayparameterofeachchannelwasadjusted.AnewsetofcoherencefactorswascalculatedandthecorrecteddatawasoptimizedtoformthefinalB-modeimage.Thesimulationsonpointtargetsandacystphantomshowedthattheproposedmethodoutperformedthenearestneighboringcrosscorrelationmethodandconventionalcoherence-weightingmethod,andthelateralresolutionandcontrastratiowasimprovedbyapproximately0.24mmand18dBrespectively.Theproposedmethodcombinedtheadvantagesofphaseerrorcorrectionandcoherence-weighting,whichcouldimproveimagingqualitieseffectivelyinmedicalultrasound.

简介：Spatialcoherenceresonanceinatwo-dimensionalneuronalnetworkinducedbyadditiveGaussiancolourednoiseandparameterdiversityisstudied.WefocusontheabilityofadditiveGaussiancolourednoiseandparameterdiversitytoextractaparticularspatialfrequency(wavenumber)ofexcitatorywavesintheexcitablemediumofthisnetwork.Weshowthatthereexistsanintermediatenoiselevelofthecolourednoiseandaparticularvalueofdiversity,whereacharacteristicspatialfrequencyofthesystemcomesforth.Hereby,itisverifiedthatspatialcoherenceresonanceoccursinthestudiedmodel.Furthermore,weshowthattheoptimalnoiseintensityforspatialcoherenceresonancedecaysexponentiallywithrespecttothenoisecorrelationtime.Someexplanationsoftheobservednonlinearphenomenaarealsopresented.

简介：Thegenerationofhigh-resolutionDEMfrominterferometricSARhasresultedintheneedforaccurateandefficientmethodsof2-dimensionalphaseunwrapping.Inthispaper,wegiveabriefdescriptionofthemathematicalbaseofphaseunwrapping,andadetaileddescriptionoftheunweightedandweightedleastsquarephaseunwrappingalgorithm.Thenouralgorithmcombiningwiththeweightedleastsquarephaseunwrappingguidedbythebranch-cutsderivedfromGoldstein’salgorithmandcoherencecoefficientmapderivedfromtheINSARdataisprovided.InourexperimentwewritesubroutinesoftheGoldstein’sbranch-cutalgorithm,unweightedandweightedleastsquarephaseunwrappingalgorithmaswellasouralgorithm,andconstructasmallexperimentsystemtoresolvethephaseunwrappingproblem.FinallywetestouralgorithmonsomeINSARdata.Theresultshowsthatourapproachcanobtainunwrappedphasecorrectlyandefficiently.

简介：Ｔｈｅｒｅｓｅａｒｃｈｏｎｔｈｅｓｐａｃｅ┐ｔｉｍｅｃｏｈｅｒｅｎｃｅｏｆＸｉａｎｓｈｕｉｈｅｆａｕｌｔｚｏｎｅｉｎｔｈｅｐｒｏｃｅｓｏｆｓｅｉｓｍｏｇｅｎｙＳＨＩ－ＢＩＡＯＷＡＮＧ（王时标）ＺＨＥＮ－ＸＩＮＧＹＡＯ（姚振兴）Ｉｎｓｔｉｔｕｔｅｏｆ...