学科分类
/ 1
11 个结果
  • 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。

  • 标签: 物理学 理论 现状 发展
  • 简介:Thispapercontainsadetailed,selfcontainedandmorestreamlinedproofofthel~2decouplingtheoremforhypersurfacesfromthepaperofBourgainandDemeterin2015.TheauthorshopethiswillserveasagoodwarmupforthereadersinterestedinunderstandingtheproofofVinogradov'smeanvaluetheoremfromthepaperofBourgain,DemeterandGuthin2015.

  • 标签:
  • 简介:Amajordifficultyinmultivariablecontroldesignisthecross-couplingbetweeninputsandoutputswhichobscurestheeffectsofaspecificcontrollerontheoverallbehaviorofthesystem.Thispaperconsiderstheapplicationofkernelmethodindecouplingmultivariableoutputfeedbackcontrollers.Simulationresultsarepresentedtoshowthefeasibilityftheproposedtechnique.

  • 标签: 支撑向量回归 kernel回归 去耦 多元控制系统
  • 简介:ForaclassofSISOnonlinearcontrolsystemswithparameteruncertaintyanalmostdisturbancedecouplingproblemwithstabilityisdefinedandinvestigated.Backsteppingtechniqueprovidesapractcaldesignmethodofcontroller,underwhichtheL2gainfromthedisturbancetothecontrolledoutputcanbearbitrarilysmallsubjecttononlinearuncertaintiesandtheclose-loopsystemisinternallyasymptoticallystable.

  • 标签: 非线性控制系统 不确定性 扰动解耦合
  • 简介:为有强壮的非线性,严肃的联合和不确定性的复杂工业进程的一个类,一个非线性的去耦proportional-integral-differential(PID)控制器被建议,它为unmodeled动力学由一个传统的PID控制器,一个去耦赔偿者和一个前馈控制赔偿者组成。如此的控制器的参数基于概括最小的变化控制法律被选择。unmodeled动力学被神经网络估计并且补偿,切换的机制被介绍改善追踪性能,然后,一个非线性的去耦PID控制算法被建议。在如此的切换的系统的所有信号全球性被围住,追踪的错误是会聚的。模拟显示出算法的有效性。

  • 标签: 解耦控制 PID 比例积分微分 神经网络 工业过程
  • 简介:ThepresentpaperanalyzeshistoricallytherelationshipbetweencarbonemissionandeconomicdevelopmentbydifferentstagesthroughadoptingelasticdecouplingmethodsandTapioevaluationcriteriaalongwithacomparisonwiththenationalFiveYearPlans.TheanalysisshowsthattheinfluencingfactorstotherelationshipbetweencarbonemissionandeconomyinChinaaredifferent,andeconomicdevelopmentandcarbonemissionhavelessconnectionintherecent30yearsofreformandopening-upinChina.Itisadifficulttasktorealizethepromisethatwewillreducecarbonemissionby40%-50%in2020basedonthedatafromhistoricalexperienceanddifferentexpectationsforeconomicdevelopmentfromeconomists.Throughconstructingthecalcula-tionmodelofcarbonemissionintensitygapaccordingtodifferentdevelopmentscenarios,theanalysisshowsthateconomicgrowth,infrastructureinvestmentandfurtherdevelopmentofindustrial-izationarethemaindriverstotheincreaseofcarbonemission,technologicalprogress,andparticularly,thereductionofenergyconsumptionistheprimarymeanstoreducecarbonemissioninChina.Itisimperativetotransformtheeconomicgrowthpattern,anditisagrandtasktoperformandthereisalongwaytogoforChinatomaintaineconomicgrowthandreducecarbonintensity.

  • 标签: 基础设施投资 差距分析 解耦方法 中国 弹性 经济增长方式
  • 简介:Apowerallocationschemeformulti-usermultiple-inputmultiple-outputorthogonalfrequencydivisionmultiplexing(MIMO-OFDM)systemswithchannelstateinformation(CSI)ontransmitterandreceiverispressed.Multi-userpowerallocationcanbedecoupledintosingleuserpowerallocationthroughoutnullspacemappingofmulti-userchannelandpowerallocationcanbeperformedthroughoutspatial-spectralwater-fillingforperuser.Todealwithmoreusersinsystemandfadingcorrelation,schedulingisperformedtomaintainthegainofpowerallocation.Theproposedschemecansubstantiallyimprovesystem'sspectralefficiencywithlowomplexity.Simulationresultsvalidatetheaccuracyoftheoreticanalyses.

  • 标签: 功率分配 MIMO-OFDM系统 多用户信息理论 无线资源管理
  • 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.

  • 标签: 变风量空调系统 遗传优化算法 PID控制器 解耦控制系统 浮点遗传算法 控制回路
  • 简介:多层的印刷电路董事会(聚氯联苯)的放射排放(RE)将引起电磁的相容性问题。在聚氯联苯的飞机被介绍的为在从力量地面(P/G)减少RE评估去耦电容器的有效性的一个有效数字方法。一个二维的边界元素方法(BEM)被用来建立放射模型。然后,RE被边地的相等的磁性的电流在P/G飞机附近计算。而且,P/G飞机的放射和输入阻抗装了去耦电容器为频率被计算直到5GHz。没有去耦电容器,结果与盒子的那些相比。它证明去耦电容器有效地除了反反响的频率装减少RE。在更高的频率,去耦有效性主要取决于电容器大头针而非价值的寄生电感。

  • 标签: 去耦电容 辐射发射 边界元法 面发射 地平 电源
  • 简介:TheissueofgrainsecurityinChinaisattractingglobalattention.Inthisresearch,weanalyzetherelationshipbetweengrainproductionandcroplandresources.Theresultsindicatethatdecouplingofthesetwovariablesisrealizedatthenationallevel,andfertilizerandirrigationplayincreasinglyimportantrolesingrainproduction.Ofthe18principalgrainproducingprovinces,sevenshowedabsolutedecoupling,threeshowedrelativedecoupling,fiveshowedquasi-relativedecoupling,andthreeprovincesshowedcoupling.Also,therelativeimportanceoffertilizerandirrigationingrainproductionisdifferentamongthefourdifferentmodesofcoupling/decoupling.

  • 标签: DECOUPLING GRAIN production GRAIN CROPLAND resourc
  • 简介:有为非静止的Navier-Stokes/Darcy模型的不同子域时间步的一个去耦方法被提出并且分析。方法有异步的时间步,它在多孔的区域在液体区域和大时间步采用小时间步。它相对节省大量中央处理器时间。方法的稳定性和集中被证明。数字结果被介绍说明建议方法的特征。

  • 标签: 去耦(数学) 海军司烧方程 数学公式 稳定性理论 随机的集中