简介:Amulti-proxyquantumgroupsignatureschemewiththresholdsharedverificationisproposed.Anoriginalsignermayauthorizeaproxygroupashisproxyagent.Thenonlythecooperationofallthesignersintheproxygroupcangeneratetheproxysignatureonbehalfoftheoriginalsigner.Inthescheme,anytormoreofnreceiverscanverifythemessageandanyt1orfewerreceiverscannotverifythevalidityoftheproxysignature.
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。
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。
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。
简介:Thefocusingofaradiallypolarizedbeamwithoutannularapodizationoraphasefilterattheentrancepupiloftheobjectiveresultsinawidefocusandlowpurityofthelongitudinallypolarizedcomponent.However,thepresenceofaphysicalannularapodizationorphasefiltermakessomeapplicationsmoredifficultorevenimpossible.Weproposearadiallypolarizedandamplitude-modulatedannularmulti-Gaussianbeammode.Numericalsimulationshowsthatitcanbefocusedintoasharperfocalspotof0.125λ~2withoutadditionalapodizationsorfilters.Thebeamqualitydescribingthepurityoflongitudinallypolarizedcomponentisupto86%.
简介:Usingbi-spinorfieldswewritethepseudo-scalarandbi-spinorfieldsthatarecharacterizedbythefieldfunctionsofcoordinatesofseveralparticles,namelymulti-particlefields.Byapplyingthequantizationproceduretothesemulti-particlefields,hadroniccreationandannihilationoperatorshavebeenobtained.
简介:Basedonthediffractiontheorymodelforhot-imageformation,theevolutionofhot-imagesinducedbymulti-scattererslocatedinthesameplaneperpendiculartothepropagationaxisisnumericallysimulated.Thesimulationresultsshowthathot-imagesinducedbycoplanarmulti-scatterersarealsocoplanarnomatterwhethertheyexistsimultaneouslyorseverally.However,iftheyexistsimultaneouslythepeakintensityoftheprimaryhot-imagesisweakerthaniftheyexistseverally.Theunequalcompetitionforenergybetweenthescatteredbeamsfromthescatterersleadstothefactthatpartofthecorrespondinghot-imagesarerelativelyenhancedandtheothersarerestrained.Theresultsshowthatthehot-imagesofcertainscatterersbecomestrongerwhenanyoftheseparameters,i.e.amplitudemodulationcoefficient,phasemodulationcoefficientandsizeofthesurroundingscatterer,decrease.
简介:Adynamicexperimentalapparatustomeasuretheinstantaneousvelocityandpressureinthemultibypasspulsetuberefrigerator(MPTR)wasdesignedandconstructed.SomeimportantexperimentalresultsoftheinstantaneousmeasurementsofthevelocityandthepressureintheMPTRwithtwobypasstubesduringactualoperationareprsented.Theeffectsofthemiddle-bypassversiononthedynamicpressureandmassflowrateatthecoldendofthepulsetubeareevaluatedfromexperimentalmeasurements.DC-flowphenomenaareobservedinthisMPTR.Thereasonsofthemulti-bypassversionimprovedtheperformanceofpulsetuberefrigertoraregiven.
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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%.
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.
简介:Nonlinearconsensusprotocolsfordynamicdirectednetworksofmulti-agentsystemswithfixedandswitchingtopologiesareinvestigatedseparatelyinthispaper.Basedonthecentremanifoldreductiontechnique,nonlinearconsensusprotocolsarepresented.Weprovethatagroupofagentscanreachaβ-consensus,thevalueofwhichisthegroupdecisionvaluevaryingfromtheminimumandthemaximumvaluesoftheinitialstatesoftheagents.Moreover,wederivetheconditionstoguaranteethatalltheagentsreachaβ-consensusonadesiredgroupdecisionvalue.Finally,asimulationstudyconcerningtheverticalalignmentmanoeuvereofateamofunmannedairvehiclesisperformed.Simulationresultsshowthatthenonlinearconsensusprotocolsproposedaremoreeffectivethanthelinearprotocolsfortheformationcontroloftheagentsandtheyareanimprovementoverexistingprotocols.
简介:High-pressureratioandwideoperatingrangearehighlyrequiredforaturbochargerindieselengines.Arecirculationflowtypecasingtreatmentiseffectiveforflowrangeenhancementofcentrifugalcompressors.Tworinggroovesonasuctionpipeandashroudcasingwallareconnectedbymeansofanannularpassageandstablerecirculationflowisformedatsmallflowratesfromthedownstreamgroovetowardtheupstreamgroovethroughtheannularbypass.Theshapeofbaselinerecirculationflowtypecasingismodifiedandoptimizedbyusingamulti-pointoptimizationcodewithametamodelassistedevolutionaryalgorithmembeddingacommercialCFDcodeCFXfromANSYS.Thenumericaloptimizationresultsgivetheoptimizeddesignofcasingwithimprovingadiabaticefficiencyinwideoperatingflowraterange.Sensitivityanalysisofdesignparametersasafunctionofefficiencyhasbeenperformed.Itisfoundthattheoptimizedcasingdesignprovidesoptimizedrecirculationflowrate,inwhichanincrementofentropyriseisminimizedatgroovesandpassagesoftherotatingimpeller.