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。
简介:Thispapercontainsadetailed,selfcontainedandmorestreamlinedproofofthel~2decouplingtheoremforhypersurfacesfromthepaperofBourgainandDemeterin2015.TheauthorshopethiswillserveasagoodwarmupforthereadersinterestedinunderstandingtheproofofVinogradov'smeanvaluetheoremfromthepaperofBourgain,DemeterandGuthin2015.
简介:Amajordifficultyinmultivariablecontroldesignisthecross-couplingbetweeninputsandoutputswhichobscurestheeffectsofaspecificcontrollerontheoverallbehaviorofthesystem.Thispaperconsiderstheapplicationofkernelmethodindecouplingmultivariableoutputfeedbackcontrollers.Simulationresultsarepresentedtoshowthefeasibilityftheproposedtechnique.
简介:ForaclassofSISOnonlinearcontrolsystemswithparameteruncertaintyanalmostdisturbancedecouplingproblemwithstabilityisdefinedandinvestigated.Backsteppingtechniqueprovidesapractcaldesignmethodofcontroller,underwhichtheL2gainfromthedisturbancetothecontrolledoutputcanbearbitrarilysmallsubjecttononlinearuncertaintiesandtheclose-loopsystemisinternallyasymptoticallystable.
简介:ThepresentpaperanalyzeshistoricallytherelationshipbetweencarbonemissionandeconomicdevelopmentbydifferentstagesthroughadoptingelasticdecouplingmethodsandTapioevaluationcriteriaalongwithacomparisonwiththenationalFiveYearPlans.TheanalysisshowsthattheinfluencingfactorstotherelationshipbetweencarbonemissionandeconomyinChinaaredifferent,andeconomicdevelopmentandcarbonemissionhavelessconnectionintherecent30yearsofreformandopening-upinChina.Itisadifficulttasktorealizethepromisethatwewillreducecarbonemissionby40%-50%in2020basedonthedatafromhistoricalexperienceanddifferentexpectationsforeconomicdevelopmentfromeconomists.Throughconstructingthecalcula-tionmodelofcarbonemissionintensitygapaccordingtodifferentdevelopmentscenarios,theanalysisshowsthateconomicgrowth,infrastructureinvestmentandfurtherdevelopmentofindustrial-izationarethemaindriverstotheincreaseofcarbonemission,technologicalprogress,andparticularly,thereductionofenergyconsumptionistheprimarymeanstoreducecarbonemissioninChina.Itisimperativetotransformtheeconomicgrowthpattern,anditisagrandtasktoperformandthereisalongwaytogoforChinatomaintaineconomicgrowthandreducecarbonintensity.
简介:Apowerallocationschemeformulti-usermultiple-inputmultiple-outputorthogonalfrequencydivisionmultiplexing(MIMO-OFDM)systemswithchannelstateinformation(CSI)ontransmitterandreceiverispressed.Multi-userpowerallocationcanbedecoupledintosingleuserpowerallocationthroughoutnullspacemappingofmulti-userchannelandpowerallocationcanbeperformedthroughoutspatial-spectralwater-fillingforperuser.Todealwithmoreusersinsystemandfadingcorrelation,schedulingisperformedtomaintainthegainofpowerallocation.Theproposedschemecansubstantiallyimprovesystem'sspectralefficiencywithlowomplexity.Simulationresultsvalidatetheaccuracyoftheoreticanalyses.
简介:Variable-air-volume(VAV)air-conditioningsystemisamulti-variablesystemandhasmulticouplingcontrolloops.Whileallofthecontrolloopsareworkingtogether,theyinterfereandinfluenceeachother.AmultivariabledecouplingPIDcontrollerisdesignedforVAVair-conditioningsystem.Diagonalmatrixdecouplingmethodisemployedtoeliminatethecouplingbetweentheloopofsupplyairtemperatureandthatofthermal-spaceairtemperature.ThePIDcontrollerparametersareoptimizedbymeansofanimprovedgeneticalgorithminfloatingpointrepresentationstoobtainbetterperformance.Thepopulationintheimprovedgeneticalgorithmmutatesbeforecrossover,whichishelpfulfortheconvergence.Additionallythemicromutationalgorithmisproposedandappliedtoimprovetheconvergenceduringthelaterevolution.Tosearchthebestparameters,theoptimizedparametersrangesshouldbeamplified10timestheinitialidealparameters.Thesimulationandexperimentresultsshowthatthedecouplingcontrolsystemiseffectiveandfeasible.Themethodcanovercomethestrongcouplingfeatureofthesystemandhasshortergoverningtimeandlessover-shootthannon-optimizationPIDcontrol.
简介:TheissueofgrainsecurityinChinaisattractingglobalattention.Inthisresearch,weanalyzetherelationshipbetweengrainproductionandcroplandresources.Theresultsindicatethatdecouplingofthesetwovariablesisrealizedatthenationallevel,andfertilizerandirrigationplayincreasinglyimportantrolesingrainproduction.Ofthe18principalgrainproducingprovinces,sevenshowedabsolutedecoupling,threeshowedrelativedecoupling,fiveshowedquasi-relativedecoupling,andthreeprovincesshowedcoupling.Also,therelativeimportanceoffertilizerandirrigationingrainproductionisdifferentamongthefourdifferentmodesofcoupling/decoupling.