简介：Westudyanonlinearlosslesspolarizer(NLP),afiber-baseddeviceabletocontrolthepolarizationofanopticalsignalwhilepreservingitsenergy.TheNLPexploitsthelosslesspolarizationattraction(LPA)generatedbytheKerrinteractionsbetweenthesignalandafullypolarizedcontinuouswave(CW)pump.Byemployingacopropagatingpump,weshowthattheeffectivenessofLPAdependsonthejointactionoftheKerrnonlinearityandthemutualdelaybetweensignalandpump.WefindtheoptimalpumpwavelengthplacementanddemonstratethattrueLPAoccursonlywithinalimitedrangeofdelayvalues.Thus,weexplainwhythecopropagatingNLPismoreflexibleandpowerefficientcomparedwiththetraditionalcounterpropagatingNLP.

简介：所有液体动态方程在他们的当模特儿的规模下面是有效的，意味着免费路径例如粒子并且意味着Boltzmann方程的碰撞时间规模和NavierStokes(NS)方程的水动力学规模。当前的计算液体动力学(CFD)集中于部分微分方程(PDE)的数字答案，并且它的目的是得到这些管理方程的精确答案。在如此的一个CFD惯例下面，它是难的开发盖住流动物理从的一个统一计划对水动力学运动因为没有能用Boltzmann做光滑的转变到当模特儿的NS的如此的管理方程，连续地可伸缩。液体动力学的学习需要超出传统的数字部分微分方程。出现设计应用程序，例如为近空间的飞行和流动和热转移在的空气车辆设计微设备，确实要求煤气的动力学的概念的进一步的扩大到物理现实，而非传统的可区分的管理方程的更大的域。在当前的阶段，非平衡流动物理很好还没由于适当工具的缺乏被探索了或清楚地理解。不幸地在当前的数字PDE途径下面，它是难的由于有效PDE的缺席开发如此的一个有意义的工具。以便多尺度的构造和类似于构造管理方程的Boltzmann或NS的当模特儿的过程的multiphysics模拟方法，一个数字算法的发展应该基于物理建模的第一个原则。在这份报纸，而不是跟随传统的数字PDE路径，我们介绍为CFD算法开发的作为一个原则的直接建模。因为所有计算与有限房间分辨率在一个discretized空格被进行，要当模特儿的流动物理不得不在网孔尺寸和时间步骤规模被做。这里，CFD是差不多分离数字进化方程的直接构造，在网孔尺寸和时间步骤将玩的地方，在建模的动态角色处理。与在网孔之间的比率的变化，尺寸和本地粒子意味着免费路径，从到水动力学波浪繁殖的运动粒子运输和碰撞的计划愿望俘获流动物理。基于直接建模，流动运动的连续动力学�

简介：Cytoskeletonisanetworkoffilamentousproteins,suchasactinfilamentsandmicrotubules.Weproposeacontinuumcooperativehydrolysismodelwhichpossessesexactlyanalyticalsolutiontodescribethedynamicsoffilament.Theresultsshowthatthecooperativityleadstononnegative-exponentialdistributionofT(ATPorGTP)subunits.Asanapplication,weinvestigatethetreadmillingphenomenonusingourmodel.Itisshownthatthecooperativityremarkablyaffectsthelengthoffilament.

简介：连结积极反馈环，生物化学的系统的一块重要积木，能导致双稳态的切换，导致长持续的状态由简短刺激变化。在这个工作，在二种之间的流行相互的激活作为另一积极反馈被加到从许多现实主义的生物电路发源的一个通用连结positive-feedback-loop模型。积极反馈力量的一个随机的变化在反馈力量的双稳态的间隔被介绍，并且bistability在某个噪音水平为中等反馈力量出现。稳定性分析进一步基于势能风景被利用探索二个稳定的稳定的状态的导致噪音的切换行为。

简介：Ballisticthermalresistanceofgraphenenano-junctionsisinvestigatedusingnon-equilibriummoleculardynamicssimulation.Thesimulationsystemisconsistedoftwosymmetricaltrapezoidalorrectangulargraphenenanoribbons(GNRs)andaconnectingnanoscaleconstrictioninbetween.Fromthesimulatedtemperatureprofile,abigtemperaturejumpresultedfromtheconstrictionisfound,whichisproportionaltotheheatcurrentandcorrespondstoalocalballisticthermalresistance.FixingtheconstrictionwidthandthelengthofGNRs,thisballisticthermalresistanceisindependentofthewidthoftheGNRsbottomlayer,i.e.,theconvexangle.Butinterestingly,thisthermalresistancehasobvioussizeeffect.Itisinverselyproportionaltotheconstrictionwidthandwilldisappearwiththeconstrictionbeingwider.Moreover,basedonthephonondynamicstheory,atheoreticalmodeloftheballisticthermalresistanceintwo-dimensionalnano-systemsisdeveloped,whichgivesagoodexplanationonmicrocosmiclevelandagreeswellwiththesimulationresultquantitativelyandqualitatively.

简介：一种amphiphilic功能的单体被选择修改polyacrylamide(PAM)或部分hydrolyzedpolyacrylamide(HPAM)。修改polyacrylamide(HM-PAM)的相对性质并且部分修改了象旋转的半径那样的hydrolyzedpolyacrylamide(HM-HPAM)(Rg),水动力学半径(RH),和光线的分发功能(RDF)是学习了与从1%～4%改变修改单体的数量发现在聚合物链和内在的粘性的微观结构之间的内在的关系。当修改单体的百分比是2%并且当时，有更强壮的盐忍耐时，模拟结果证明与HPAM相比，HM-HPAM在增加粘性有更好的表演修改单体是4%。而且，复杂的氢结合的网络与光线的分发函数(RDF)的分析被揭示，对关联函数被用来调查Na的扩散性在COO的+和碳原子组。

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简介：WetheoreticallyinvestigatetheenergybandstructureandJosephsondynamicsofaspin-orbitcoupledBose–Einsteincondensateinadouble-wellpotential.WestudytheenergybandstructureandthecorrespondingtunnelingdynamicsofthesystembyproperlyadjustingtheSOcoupling,Ramancoupling,Zeemanfieldandatomicinteractions.ThecoupledeffectsofSOcoupling,Ramancoupling,Zeemanfieldandatomicinteractionsleadtotheappearanceofcomplexenergybandstructureincludingtheloopstructure.Particularly,theemergenceoftheloopstructureinenergybandalsodependsonSOcoupling,Ramancoupling,Zeemanfieldandatomicinteractions.Correspondingly,theJosephsondynamicsofthesystemarestronglyrelatedtotheenergybandstructure.Especially,theemergenceoftheloopstructureresultsincomplextunnelingdynamics,includingsuppression-revivaltransitionsandself-trappingofatomstransferbetweentwospinstatesandtwowells.Thisengineeringprovidesapossiblemeansforstudyingenergylevelandcorrespondingdynamicsoftwo-speciesSOcoupledBECs.

简介：我们为Davey-Stewartson系统学习发作答案(D-S系统，为短)在L<潜水艇class=“a-plus-plus”>x<啜class=“a-plus-plus”>2(<啜class=“a-plus-plus”>2)。首先，我们给D-S系统的解决方案的非线性的侧面分解。然后，我们证明最小的集体发作答案的存在。由使用最小的集体发作答案的特征，最后，我们获得限制侧面和L的精确集体的集中<啜class=“a-plus-plus”>D-S系统的2个发作解决方案。

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简介：Thediscreteiterativemapmodelofpeakcurrent-modecontrolledbuckconverterwithconstantcurrentload(CCL),containingtheoutputvoltagefeedbackandrampcompensation,isestablishedinthispaper.BasedonthismodelthecomplexdynamicsofthisconverterisinvestigatedbyanalyzingbifurcationdiagramsandtheLyapunovexponentspectrum.Theeffectsoframpcompensationandoutputvoltagefeedbackonthestabilityoftheconverterareinvestigated.Experimentalresultsverifythesimulationandtheoreticalanalysis.Thestabilityboundaryandchaosboundaryareobtainedunderthetheoreticalconditionsofperiod-doublingbifurcationandbordercollision.Itisfoundthattherearefouroperationregionsinthepeakcurrent-modecontrolledbuckconverterwithCCLduetoperiod-doublingbifurcationandborder-collisionbifurcation.Researchresultsindicatethatrampcompensationcanextendthestableoperationrangeandtransfertheoperatingmode,andoutputvoltagefeedbackcaneventuallyeliminatethecoexistingfast-slowscaleinstability.

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简介：Athoroughunderstandingonthemechanicalpropertiesofcarbonnanotube(CNT)isessentialinextendingtheadvancedapplicationsofCNTbasedsystems.However,conductingexperimentstoestimatemechanicalpropertiesatthisscaleisextremelychallenging.Therefore,developmentofmechanisticmodelstoestimatethemechanicalpropertiesofCNTsalongwiththeintegrationofexistingcontinuummechanicsconceptsiscriticallyimportant.ThispaperpresentsacomprehensivemoleculardynamicssimulationstudyonthesizedependencyandpotentialfunctioninfluenceofmechanicalpropertiesofCNT.Commonlyusedreactivebondorder(REBO)andadaptiveintermolecularreactivebondorder(AIREBO)potentialfunctionswereconsideredinthisregard.Young'smodulusandshearmodulusofCNTsarederivedbyintegratingclassicalcontinuummechanicsconceptswithmoleculardynamicssimulations.TheresultsindicatethatthepotentialfunctionhasasignificantinfluenceontheestimatedmechanicalpropertiesofCNTs,andtheinfluenceofpotentialfieldismuchhigherwhenstudyingthetorsionalbehaviourofCNTsthanthetensilebehaviour.

简介：Multipleexcitongeneration(MEG)dynamicsincolloidalPbSquantumdots(QDs)characterizedwithanimprovedtransientgrating(TG)techniquewillbereported.Onlyonepeaksoonafteropticalabsorptionandafastdecaywithin1pscanbeobservedintheTGkineticswhenthephotonenergyofthepumplighthνissmallerthan2.7Eg(Eg:bandgapbetweenLUMOandHOMOintheQDs),whichcorrespondstohotcarriercooling.Whenhνisgreaterthan2.7Eg,however,aftertheinitialpeak,theTGsignaldecreasesfirstandsoonincreases,andthenanewpeakappearsatabout2to3ps.TheinitialpeakandthenewpeakcorrespondtohotcarriersatthehigherexcitedstateandMEGatthelowestexcitedstate,respectively.Byproposingatheoreticalmodel,wecancalculatethehotcarriercoolingtimeconstantandMEGoccurrencetimeconstantquantitatively.WhenMEGdoesnothappenforhνsmallerthan2.7Eg,hotcarriercoolswithatimeconstantof400fs.WhenMEGoccursforhνlargerthan2.7Eg,hotcarriercoolswithatimeconstantassmallas200fs,whileMEGoccurswithatimeconstantof600fs.ThedetailedhotcarriercoolingandMEGoccurrencedynamicscharacterizedinthisworkwouldshedlightonthefurtherunderstandingofMEGmechanismofvarioustypeofsemiconductorQDs.

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简介：Thenatureofresistivetransitionofhigh-qualitycrystallinethinfilmsofYBa2Cu3O7-δhasbeenstudiedundermagneticfields(H)appliedalongthecdirectionoverawiderangeofdopedholes,p,intheCuO2planes.Thefield-andtemperature-dependentin-planeresistivity,ρab(T,H),hasbeenanalyzedwithinthethermallyassistedflux-flow(TAFF)formalism.Thefluxactivationenergy,U(T,H),hasbeenextractedfromthisanalysis.Thelow-Tpartoftheρab(T,H)datacanbedescribedbyanactivationenergyhavingthefunctionalformofU(T,H)=(1-t)m(H-0/H)β,wheret=T/Tc(reducedtemperature),andH0isafieldscalethatprimarilydeterminesthemagnitudeofU(T,H).Thetemperatureexponent,m,showsasystematicvariationwithp,whereasthefieldexponent,β,isinsensitivetothepvaluesandisclosetounity.TheH0,ontheotherhand,changesrapidlyaspisvaried.U(T,H)islinkedtothepinningpotentialandconsequentlyonthesuperconductingcondensationenergy.Sincethenormalstatepseudogapdirectlyaffectssuperconductingcondensationenergy,aclearcorrespondencebetweenH0andthePGenergyscale,εg,isfound.Possibleimplicationsoftheseresultsarediscussed.