学科分类
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89 个结果
  • 简介:Amulti-proxyquantumgroupsignatureschemewiththresholdsharedverificationisproposed.Anoriginalsignermayauthorizeaproxygroupashisproxyagent.Thenonlythecooperationofallthesignersintheproxygroupcangeneratetheproxysignatureonbehalfoftheoriginalsigner.Inthescheme,anytormoreofnreceiverscanverifythemessageandanyt1orfewerreceiverscannotverifythevalidityoftheproxysignature.

  • 标签: 阀值共享特征 代理量子群特征 量子特征 代理签名
  • 简介:我们为非线性的Schrodinger方程调查multi-symplecticEuler盒子计划。二个新简单半明确的计划被导出。一个作文计划也基于新导出的计划被讨论。一些数字结果被报导说明新计划的效率。

  • 标签: 多项偶对列表 非线性方程 哈密顿方程 数学物理
  • 简介:为多看法录像编码的一个新奇颜色赔偿方法(MVC)被建议,它高效地与照相机的差异引起的颜色失配的存在利用在看法之间的会见相关性。一个颜色赔偿模型在红绿蓝隧道被开发然后为实际使用延长了到YCbCr隧道。一幅修改会见参考图画基于颜色赔偿模型被构造,它比原来的会见参考图画更类似于编码图画。而且,颜色赔偿因素能在编码器和解码器被导出,因此,没有另外的数据需要被传给解码器。试验性的结果证明建议方法改进MVC的编码效率并且维持好主观质量。

  • 标签: 多视频编码 色彩补偿 照相机 多样性
  • 简介:在黑色基于Blandford-Znajek和磁性的联合进程的共存洞(BH)生长圆盘,为喷气力量的一个多参数模型和活跃星群的原子核(AGN)的收音机大声被学习。结果,AGN的收音机大声能被五个参数管理:(ⅰ)BH旋转,(ⅱ)变化的一个幂定律索引磁性在圆盘上删除;(ⅲ)决定圆盘的内部边的位置的一个参数,(ⅳ)到生长流动的最深处的部分的公羊压力的领带地平线上的磁场的压力的比率,并且(ⅴ)到地平线的户外Reldlines的尖速度的比率。观察两分在之间收音机大声并且收音机安静AGN被上述参数的效果很好解释。而且,我们独立关于每个参数讨论AGN的收音机大声的衍生物。另外,AGN的收音机大声上的螺丝钉不稳定性的效果被讨论。

  • 标签: 多参数模型 星系核 黑洞物理学 射电响度 双峰分布
  • 简介:时间的不平等的一种新类型被讨论,它适用于算法的进程,包含处理联合起来的有限记忆。他们是Leggett-Grag,以及到由Brukner等的修改的一种选择。如果一个人考虑包含有限存储器的系统的量和古典进程的比较(在两个盒子中的一样的能力),不平等给我们能期望量加速的一条清楚的消息。在古典进程,一个人清楚地总是定义可能的大小的值,或以信息处理语言如果我们有一取决于到达各个的数据的某功能的顺序的计算走在一个算法上,函数总是有清楚地定义的值。在算法的结束以后,在量盒子中,仅仅最后的价值被定义。与Bohrs补充一致,所有中间的价值不能被归功于明确的价值。

  • 标签: 量子信息处理 时间 传统工艺 存储处理 定义值 算法
  • 简介:基于伴随的优化方法是在turbomachinery的一个热点。首先,这份报纸更多样地从Lagrange论述伴随方法的原则观点。第二,把一条连续线路与薄层RANS方程相结合,我们提出伴随方程和反物理的边界条件。由于在turbomachinery的多级式的环境,混合方法的伴随interrow被介绍。解决流动方程和伴随方程的数字技术是几乎一样,并且一旦他们分别地被集成,一个目的坡度工作设计变量能高效地用复杂方法被计算。第三,集成形状不安parameterization和一个简单最陡峭的降下方法,为多级式的turbomachinery的基于伴随的空气动力学的形状优化的一个框架被构造。最后,环形的串联的一个反的图案被采用验证一台Aachen1.5阶段汽轮机的上述途径,和伴随地表明伴随的保存和areflexiainterrow混合方法。然后1+1的直接重新设计相反旋转的汽轮机试图增加效率并且把限制用于集体流动率和压力比率被拿。

  • 标签: 伴随方法 叶轮机械 外形优化 多级 拉格朗日乘数 RANS方程
  • 简介:Thefocusingofaradiallypolarizedbeamwithoutannularapodizationoraphasefilterattheentrancepupiloftheobjectiveresultsinawidefocusandlowpurityofthelongitudinallypolarizedcomponent.However,thepresenceofaphysicalannularapodizationorphasefiltermakessomeapplicationsmoredifficultorevenimpossible.Weproposearadiallypolarizedandamplitude-modulatedannularmulti-Gaussianbeammode.Numericalsimulationshowsthatitcanbefocusedintoasharperfocalspotof0.125λ~2withoutadditionalapodizationsorfilters.Thebeamqualitydescribingthepurityoflongitudinallypolarizedcomponentisupto86%.

  • 标签: 高斯光束 环形 极化 径向 组成部分 光束聚焦
  • 简介:Usingbi-spinorfieldswewritethepseudo-scalarandbi-spinorfieldsthatarecharacterizedbythefieldfunctionsofcoordinatesofseveralparticles,namelymulti-particlefields.Byapplyingthequantizationproceduretothesemulti-particlefields,hadroniccreationandannihilationoperatorshavebeenobtained.

  • 标签: MULTI-PARTICLE FIELD OPERATORS
  • 简介:Basedonthediffractiontheorymodelforhot-imageformation,theevolutionofhot-imagesinducedbymulti-scattererslocatedinthesameplaneperpendiculartothepropagationaxisisnumericallysimulated.Thesimulationresultsshowthathot-imagesinducedbycoplanarmulti-scatterersarealsocoplanarnomatterwhethertheyexistsimultaneouslyorseverally.However,iftheyexistsimultaneouslythepeakintensityoftheprimaryhot-imagesisweakerthaniftheyexistseverally.Theunequalcompetitionforenergybetweenthescatteredbeamsfromthescatterersleadstothefactthatpartofthecorrespondinghot-imagesarerelativelyenhancedandtheothersarerestrained.Theresultsshowthatthehot-imagesofcertainscatterersbecomestrongerwhenanyoftheseparameters,i.e.amplitudemodulationcoefficient,phasemodulationcoefficientandsizeofthesurroundingscatterer,decrease.

  • 标签: 热图像 热诱导 散射 仿真分析 演变 共面
  • 简介:我们在场与多重奇特测量光旋涡的拓扑的费用的一个简单方法。用一个圆柱的透镜,一根旋涡横梁能与多重分开的黑暗的洞腐烂进轻地分布,谁的数,就等于输入横梁的拓扑的费用。这个结论然后与多重奇特经由实验和旋涡横梁的繁殖的数字模拟被验证。这个方法也是可靠的与奇特的不同分布测量宽带旋涡横梁的拓扑的费用,它不诉诸多重横梁interferometric实验。

  • 标签: 柱面透镜 拓扑荷 旋涡 光学 测量 奇异
  • 简介:Adynamicexperimentalapparatustomeasuretheinstantaneousvelocityandpressureinthemultibypasspulsetuberefrigerator(MPTR)wasdesignedandconstructed.SomeimportantexperimentalresultsoftheinstantaneousmeasurementsofthevelocityandthepressureintheMPTRwithtwobypasstubesduringactualoperationareprsented.Theeffectsofthemiddle-bypassversiononthedynamicpressureandmassflowrateatthecoldendofthepulsetubeareevaluatedfromexperimentalmeasurements.DC-flowphenomenaareobservedinthisMPTR.Thereasonsofthemulti-bypassversionimprovedtheperformanceofpulsetuberefrigertoraregiven.

  • 标签: 脉冲管冰箱 双旁管 动力实验
  • 简介:Withthecontinuousimprovementofthetrainspeed,thedynamicenvironmentoftrainsturnsouttobeaerodynamicdomination.Solvingtheaerodynamicproblemshasbecomeoneofthekeyfactorsofthehigh-speedtrainheaddesign.Giventhattheaerodynamicdragisasignificantfactorthatrestrainstrainspeedandenergyconservation,reducingtheaerodynamicdragisthusanimportantconsiderationofthehigh-speedtrainheaddesign.However,thereductionoftheaerodynamicdragmayincreaseotheraerodynamicforces(moments),possiblydeterioratingtheoperationalsafetyofthetrain.Themulti-objectiveoptimizationdesignmethodofthehigh-speedtrainheadwasproposedinthispaper,andtheaerodynamicdragandloadreductionfactorweresettobeoptimizationobjectives.Theautomaticmulti-objectiveoptimizationdesignofthehigh-speedtrainheadcanbeachievedbyintegratingaseriesofproceduresintothemulti-objectiveoptimizationalgorithm,suchastheestablishmentof3Dparametricmodel,theaerodynamicmeshgeneration,thecalculationoftheflowfieldaroundthetrain,andthevehiclesystemdynamics.Thecorrelationbetweentheoptimizationobjectivesandoptimizationvariableswasanalyzedtoobtainthemostimportantoptimizationvariables,andafurtheranalysisofthenonlinearrelationshipbetweenthekeyoptimizationvariablesandtheoptimizationobjectiveswasobtained.Afteroptimization,theaerodynamicdragofoptimizedtrainwasreducedbyupto4.15%,andtheloadreductionfactorwasreducedbyupto1.72%.

  • 标签: 多目标优化设计 优化设计方法 车头 车辆系统动力学 空气阻力 空气动力
  • 简介:Withthedevelopmentoflasertechnologies,multi-colorlight-fieldsynthesiswithcompleteamplitudeandphasecontrolwouldmakeitpossibletogeneratearbitraryopticalwaveforms.Apracticaloptimizationalgorithmisneededtogeneratesuchawaveforminordertocontrolstrong-fieldprocesses.Wereviewsomerecenttheoreticalworksoftheoptimizationofamplitudesandphasesofmulti-colorlaserstomodifythesingle-atomhigh-orderharmonicgenerationbasedongeneticalgorithm.Bychoosingdifferentfitnesscriteria,wedemonstratethat:(i)harmonicyieldscanbeenhancedby10to100times,(ii)harmoniccutoffenergycanbesubstantiallyextended,(iii)specificharmonicorderscanbeselectivelyenhanced,and(iv)singleattosecondpulsescanbeefficientlygenerated.Thepossibilityofoptimizingmacroscopicconditionsfortheimprovedphasematchingandlowdivergenceofhighharmonicsisalsodiscussed.Thewaveformcontrolandoptimizationareexpectedtobenewdriversforthenextwaveofbreakthroughinthestrong-fieldphysicsinthecomingyears.

  • 标签: 高次谐波 波形控制 优化算法 激光技术 多色 相位控制
  • 简介:Nonlinearconsensusprotocolsfordynamicdirectednetworksofmulti-agentsystemswithfixedandswitchingtopologiesareinvestigatedseparatelyinthispaper.Basedonthecentremanifoldreductiontechnique,nonlinearconsensusprotocolsarepresented.Weprovethatagroupofagentscanreachaβ-consensus,thevalueofwhichisthegroupdecisionvaluevaryingfromtheminimumandthemaximumvaluesoftheinitialstatesoftheagents.Moreover,wederivetheconditionstoguaranteethatalltheagentsreachaβ-consensusonadesiredgroupdecisionvalue.Finally,asimulationstudyconcerningtheverticalalignmentmanoeuvereofateamofunmannedairvehiclesisperformed.Simulationresultsshowthatthenonlinearconsensusprotocolsproposedaremoreeffectivethanthelinearprotocolsfortheformationcontroloftheagentsandtheyareanimprovementoverexistingprotocols.

  • 标签: 中心流形 代理系统 非线性 协议 群体决策 仿真结果
  • 简介:High-pressureratioandwideoperatingrangearehighlyrequiredforaturbochargerindieselengines.Arecirculationflowtypecasingtreatmentiseffectiveforflowrangeenhancementofcentrifugalcompressors.Tworinggroovesonasuctionpipeandashroudcasingwallareconnectedbymeansofanannularpassageandstablerecirculationflowisformedatsmallflowratesfromthedownstreamgroovetowardtheupstreamgroovethroughtheannularbypass.Theshapeofbaselinerecirculationflowtypecasingismodifiedandoptimizedbyusingamulti-pointoptimizationcodewithametamodelassistedevolutionaryalgorithmembeddingacommercialCFDcodeCFXfromANSYS.Thenumericaloptimizationresultsgivetheoptimizeddesignofcasingwithimprovingadiabaticefficiencyinwideoperatingflowraterange.Sensitivityanalysisofdesignparametersasafunctionofefficiencyhasbeenperformed.Itisfoundthattheoptimizedcasingdesignprovidesoptimizedrecirculationflowrate,inwhichanincrementofentropyriseisminimizedatgroovesandpassagesoftherotatingimpeller.

  • 标签: 离心式压缩机 优化设计 环流式 壳体 环形通道 流量范围