简介:Graphitehasbeencurrentlyconsideredasapromisingcathodematerialindualionbatteries(DIBs)duetoitsuniquefeaturesofsp2hybridizedcarbonandstackedtwo-dimensionallayeredstructures.However,unexpectedvolume/thicknesschangesinthegraphitecathodes,inducedbytheintercalation/deintercalationofanionswithlargemolecularsizehavebeenknowntobeacriticalproblemindesigningDIBcells.Tounderstandthevolume/thicknesschangesintheDIBelectrodes,inoperandoopticalobservingapparatushasbeenemployedtoobservethecross-sectionviewofagraphite-basedcathodeuponcyclesinthepresentwork.Theobservationsuggeststhatthecathodeinitiallypresentedahugeirreversiblethicknesschange(60%),andsuchthicknessvariationwaspronetoreduceandremain<20%inthefollowingcycles.Theresultsfrombothinoperandoobservationandelectrochemicalcharacterizationscollectivelyindicatethatthegreaterthicknessvariationatinitialcycleshouldbeattributedtobothanionintercalationintographite-basedcathodesandirreversibledecompositionofchemicalcomponentsintheDIBsystem.Themethodherehighlightsauniversalrouteforfundamentallyunderstandingtheelectrodesofhugevolumevariation.
简介:Thetargetofthelargenegativeionsourcebasedonneutralbeaminjection(N-NBI)istoproduceneutralbeamcurrentof22Aandbeampowerof10MWat500keVwithdurationtimeof10s.Sinceitwassuccessfullyoperatedin1996,the5.3MWneutralbeampowerat380keVwithdurationtimeof3shasbeenachieved.Inrecentyearsimprovingandenhancingthebeampoweraregoingon.Severalreasonssuchasplasmanon-uniformity,higherbeamdensityattheupperregioninthebeamprofile,
简介:Inthispaperweconsideranon-standardinverseheatconductionproblemfordeterminingsurfaceheatfluxfromaninteriorobservationwhichappearsinsomeappliedsubjects.Thisproblemisill-posedinthesensethatthesolution(ifitexists)doesnotdependcontinuouslyonthedata.AFouriermethodisappliedtoformulatearegularizedapproximationsolution,andsomesharperrorestimatesarealsogiven.
简介:Anewcomputationschemeproposedtotacklecommensurateproblemsisdevelopedbymodifyingthesemi-analyticapproachforminimizingcomputationalcomplexity.Usingtheproposedscheme,thelimitstateequations,usuallyreferredtoasthefailuresurface,areobtainedfromtransformationofanintervalvariabletoanormalizedone.Inordertominimizethecomputationalcost,twoalgorithmsforoptimizingthecalculationstepshavebeenproposed.Themonotonicityoftheobjectivefunctioncanbedeterminedfromnarrowingthescopeofintervalvariablesinnormalizedinfinitespacebyincorporatingthealgorithmsintothecomputationalscheme.Twoexamplesareusedtoillustratetheoperationandcomputationalefficiencyoftheapproach.Theresultsoftheseexamplesshowthattheproposedalgorithmscangreatlyreducethecomputationcomplexitywithoutsacrificingthecomputationalaccuracy.Theadvantageoftheproposedschemecanbeevenmoreefficientforanalyzingsophisticstructures.
简介:Wehavestudiedaswitchablehyperbolicmetamaterialcomposedofagraphene–dielectricperiodicstructure.Bytuningthechemicalpotentialofallgraphenesheetssimultaneously,theisofrequencycurvecanswitchbetweenanellipseandahyperbolaconveniently.Inparticular,aspecialhyperbolicisofrequencycurvewithitsasymptoteperpendiculartotheinterfaceisobtainedandusedtorealizethezeroreflectioneffect.Furthermore,azeroreflection-basedopticalswitchworkingintheterahertzspectrumisdemonstrated.Itsbandwidthcanbeefficientlyadjustedbygeometricparameterssuchaspermittivityandperiod.Suchanopticalswitchpossessesthemeritsoflowloss,hightransmittancecontrast,highresponsespeed,compactsize,hightoleranceofchemicalpotential,andhavingallincidentangles(0°–90°)simultaneously.Suchanopticalswitchholdsgreatpotentialinmanyfields,suchasdatastorage,beamsteering,andintegratedphotoniccircuits.
简介:这篇文章学习最佳的消费空闲,公事包和其偏爱被-maxmin提出的一个无穷地过的投资者的退休选择是区分歧义和歧义态度的期望的CES用途。采用递归的multiplepriors用途和向后的随机的微分方程(BSDE)的技术,我们转变-maxmin期望的CES用途进在与投资者无常的度有关的一项新概率措施下面的一个古典期望的CES实用程序。我们的模型调查最佳的consumption-leisure-work选择,最佳的公事包选择,和最佳的停止问题。在这个模型,投资者能与一种退休选择一起在某个最小的工作小时上面灵活地调整她劳动的供应。问题能是使用变化不平等解决的经分解。并且当她的财富超过某个批评水平时,最佳的退休时间作为第一次被给。在退休前后的最佳的消费空闲和公事包策略在关上的形式被提供。最后,在没有暧昧的从那些的歧义下面的最佳的消费空闲,公事包和批评财富水平的区别被讨论。
简介:Inthispaper,moreefficient,low-complexityandreliableregionofinterest(ROI)imagecodecforcompressingsmoothlowtextureremotesensingimagesisproposed.WeexploretheefficiencyofthemodifiedROIcodecwithrespecttotheselectedsetofconvenientwaveletfilters,whichisanovelmethod.SuchROIcodingexperimentanalysisrepresentinglowbitratelossytohighqualitylosslessreconstructionwithtiminganalysisisusefulforimprovingremotesensinggroundtruthsur-veillanceefficiencyintermsoftimeandquality.Thesubjective[i.e.fair,fiveobserver(HVS)evaluationsusingenhanced3DpictureviewHypermemorydisplaytechnology]andtheobjectiveresultsrevealedthatforfastergroundtruthROIcodingapplications,theSymlet-4adaptationperformsbetterthanBiorthogonal4.4andBiorthogonal6.8.However,thediscreteMeyerwaveletadaptationisthebestsolutionfordelayedROIimagereconstructions.
简介:Anewmethodforfabricatingorderedporoussiliconisreported.Atwo-dimensionalsilicananospherearrayisusedasatemplatewithahydrofluoricacid-hydrogenperoxidesolutionforetchingthenanospheres.Theinitialdiameteranddistributionoftheholesintheresultingporoussiliconlayeraredeterminedbythesizeanddistributionofthesilicananospheres.Thecorrosiontimecanbeusedtocontrolthedepthsoftheholes.ItisfoundthatthepresenceofaSiO_2layer,formedbytheoxidationoftheroughinternalsurfaceofthehole,istheprimaryreasonallowingthecorrosiontoproceed.Ultravioletreflectionandthermalconductivitymeasurementsshowthatthediameteranddistributionoftheholeshaveagreatinfluenceonpropertiesoftheporoussilicon.
简介:Anewtypeofpalladiumchelateofβ-diketone-basedsidechainliquidcrystalpolysiloxane(Pd-DKLCP)hasbeensynthesizedbychelationreactionofpalladiumdichloridewithpolymericligand,β-diketonepolysiloxane(DKLCP),usingTHFassolventatR.T..ThePd-chelationresultsingreatlyincreasingthephasetransitiontemperatureTKandtheenthalpychange△HKfromcrystaltoliquidcrystalstateandmakingthetemperaturerangeofLCstate△T(△T=TCl-TK)widened.AllthesechelatesPd-DKLCP’sdonotshowTCluntildecompositionat205℃.ItisnoteworthythatthePd-chelationcanexertmorepositiveeffectonthemesomorphicbehaviourofthepolymerligandthanthecounterpartCu-DKLCPdoes.Itisprobableduetothebiggersizeofdisc-likemesogenformedfromβ-diketoneandPd+2ionwith4dorbital.
简介:Amulti-loopadaptiveinternalmodelcontrol(IMC)strategybasedonadynamicpartialleastsquares(PLS)frame-workisproposedtoaccountforplantmodelerrorscausedbyslowaging,driftinoperationalconditions,orenvironmentalchanges.SincePLSdecompositionstructureenablesmulti-loopcontrollerdesignwithinlatentspaces,amultivariableadaptivecontrolschemecanbeconvertedeasilyintoseveralindependentunivariablecontrolloopsinthePLSspace.Ineachlatentsubspace,oncethemodelerrorexceedsaspecificthreshold,onlineadaptationrulesareimplementedseparatelytocorrecttheplantmodelmismatchviaarecursiveleastsquares(RLS)algorithm.BecausetheIMCextractstheinverseoftheminimumpartoftheinternalmodelasitsstructure,theIMCcontrollerisself-tunedbyexplicitlyupdatingtheparameters,whicharepartsoftheinternalmodel.Bothparameterconvergenceandsystemstabilityarebrieflyanalyzed,andprovedtobeeffective.Finally,theproposedcontrolschemeistestedandevaluatedusingawidely-usedbenchmarkofamulti-inputmulti-output(MIMO)systemwithpuredelay.
简介:为氢硫化物(H2S)的控制的一个凳子规模实验排出物被使用与ZX01填满包装的流简历的过滤器连续地执行将近四个月。结果建议流简历的过滤器在实质的运作的时期上证明性能优秀。H2S的移动效率是将近百分之百当从0.64g/改变的流简历的过滤器的容量的装载时(m[3]·h)到38.20g/(m[3]·h);H2S的新陈代谢产品主要由SO4组成[2]。当H2S的入口集中是250mg/m时[3],最佳气体保留时间是30s;最佳水花水流动率是0.0059~0.012L/(厘米[2]·h)。流简历的过滤器有好能力抵抗高容量的装载的吃惊,;没在哪个电阻在相对更低的价值被维持期间在实验期间被堵住将近四个月,以便流简历的过滤器不必执行回来经常洗;能稳定地被操作为长期。
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简介:Theeffectsoftwogeometricrefinementstrategieswidespreadinnaturalstructures,chiralityandself-similarhierarchy,onthein-planeelasticresponseoftwo-dimensionalhoneycombswerestudiedsystematically.Simpleclosed-formexpressionswerederivedfortheelasticmoduliofseveralchiral,antichiral,andhierarchicalhoneycombswithhexagonandsquarebasednetworks.Finiteelementanalysiswasemployedtovalidatetheanalyticalestimatesoftheelasticmoduli.Theresultswerealsocomparedwiththenumericalandexperimentaldataavailableintheliterature.WefoundthatintroducingahierarchicalrefinementincreasestheYoung'smodulusofhexagonbasedhoneycombswhiledecreasestheirshearmodulus.Forsquarebasedhoneycombs,hierarchyincreasestheshearmoduluswhiledecreasingtheirYoung'smodulus.IntroducingchiralitywasshowntoalwaysdecreasetheYoung'smodulusandPoisson'sratioofthestructure.However,chiralityremainstheonlyroutetoauxeticity.Inparticular,wefoundthatanti-tetra-chiralstructureswerecapableofsimultaneouslyexhibitinganisotropy,auxeticity,andremarkablylowshearmodulusasthemagnitudeofthechiralityoftheunitcellincreases.