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简介：Thespacecraftwithmultistagesolarpanelshavenonlinearcouplingbetweenattitudesofcentralbodyandsolarpanels,especiallytherotationofcentralbodyisconsideredinspace.Thedynamicsmodelisbasedfordynamicsanalysisandcontrol,andthemultistagesolarpanelsmeansthedynamicsmodelingwillbeverycomplex.Inthisresearch,theLiegroupvariationalintegratormethodisintroduced,andthedynamicsmodelofspacecraftwithsolarpanelsthatconnectstogetherbyflexiblejointsisbuilt.Themostobviouscharacterofthismethodisthattheattitudesofcentralbodyandsolarpanelsarealldescribedbythree-dimensionalattitudematrix.Thedynamicsmodelsofspacecraftwithoneandthreesolarpanelsareestablishedandsimulated.ThestudyshowsLiegroupvariationalintegratormethodavoidsparameterscouplingandeffectivelyreducesdifficultyofmodeling.TheobtainedcontinuousdynamicsmodelbasedonLiegroupisasetofordinarydifferentialequationsandequivalentwithtraditionaldynamicsmodelthatoffersabasisforthegeometrycontrol.

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简介：Thispaperstudiesastochasticallyforcedchemostatmodelwithfeedbackcontrolinwhichtwoorganismscompeteforasinglegrowth-limitingsubstrate.Inthedeterministiccounterpart,previousresearchesshowthatthecoexistenceoftwocompetingorganismsmaybeachievedasastablepositiveequilibriumorastablepositiveperiodicsolutionbydierentfeedbackschedules.Inthestochasticcase,basedonthestochasticsensitivityfunctiontechnique,weconstructtheconfidencedomainsfordierentfeedbackscheduleswhichallowustofindtheconfigurationalarrangementsofthestochasticattractorsandanalyzethedispersionoftherandomstatesofthestochasticmodel.

简介：ThispapergivesatutorialonhowtoproveLyapunovtypecriteriabyoptimalcontrolmethods.Firstly,weconsiderstabilitycriteriaonHill'sequationswithnonnegativepotential.Byoptimalcontrolmethodsdevelopedin1990s,weobtainseveralstabilitycriteriaincludingLyapunov'scriterion,Ne..gauzandLidski'scriterion.Secondly,wepresentstabilitycriteriaonHill'sequationswithsign-changingpotentialinwhichBrog'scriterionandKrein'scriterionareincluded.

简介：Inthethree-phasetrafficflowstudies,thetrafficflowcharacteristicatthebottlenecksectionisahotspotintheacademicfield.Thecontroversyaboutthecharacteristicsofthesynchronizedflowatbottleneckisalsothemaincontradictionbetweenthethree-phasetrafficflowtheoryandthetraditionaltrafficflowtheory.Undertheframeworkofthree-phasetrafficflowtheory,thispapertakestheon-rampasanexampletodiscussthetrafficflowcharacteristicsatthebottlenecksection.Inparticular,thispapermainlyconductsthemicro-analysistotheeffectoflanechangeunderthetwolaneconditions,aswellastheeffectoftheon-ramponthemainlinetrafficflow.Itisfoundthatwhenthemainroadflowislow,thegreatertheon-rampinflowrate,thehighertheaveragespeedofthewholeroadsection.Astheprobabilityofvehiclesenteringfromtheon-rampincreases,theflowandtheaveragespeedofthemainroadaregraduallystabilized,andthentheon-rampinflowvehiclesnolongerhaveasignificantimpactonthetrafficflow.Inaddition,thispaperfocusesonthevelocitydisturbancegeneratedattheon-ramp,andproposesthecorrespondingon-rampcontrolstrategybasedonit,andthesimulationverifiedthatthecontrolstrategycanreasonablycontrolthetrafficflowbytheon-ramp,whichcanmeetthecontrolstrategyrequirementstosomeextent.

简介：这份报纸为nonconforming莫利证明浸透是假设biharmonic方程的有限元素discretization。这断言在一致精炼下面的莫利近似的错误被比一个小的一个收缩因素严格地减少直到明确的高顺序的数据近似条款。精炼至少不得不在任何三角上切分象红精炼或3两断那样的任何边。这为莫利认为一个层次错误评估者正当有限元素方法，它简单地比较一个网孔的分离溶液并且它的红精炼。相关适应精制网孔的策略在数字实验最佳地表现。为Crouzeix-Raviartnonconforming的一篇讲话有限元素错误控制被包括。

简介：Inthepresentpaper,theauthorsintroduceanewsubclassofp-valentanalyticfunctionswithcomplexorderdefinedontheopenunitdiskU=fz:z2Candjzj<1gandobtaincoefficientinequalitiesforthefunctionsintheseclass.Applicationoftheseresultsforthefunctionsdefinedbytheconvolutionarealsoobtained.

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简介：Inthispaper,weproposeaLotka-Volterraprey-predatorsystemwithdiscretedelaysandfeedbackcontrol.Firstly,weshowthatsolutionofthesystemisbounded.Secondly,weobtainsufficientconditionfortheglobalstabilityoftheuniquepositiveequilibriumtothesystem.

简介：Thispaperproposesanultra-modifiedSSA(symmetricsequencealgorithm)ofspacevectormodulationofMC(matrixconverter).Theultra-modifiedtechniqueimprovesthedrawbacksofthemodifiedonewhereitprovidesareductionofthetotalharmonicdistortionforbothoutputvoltageandcurrent.AlsothispaperproposesamodifiedfeedforwardcontrolleroftheMCwithindirectspacevectormodulation.Themodifiedfeedforwardprovidesasolutionforthechangeintheoutputvoltageduetochangeinwindspeed,whereitprovidesaconstantoutputvoltagewithconstantfrequencyevenifthewindspeedchanged.SomeoftheadvantagesofMCareintroducedinthispaper.TheseadvantagesrepresentedintheoutputfrequencyofMCwhichmaybegreaterthantheinputfrequency,controllingrmsvalueoftheoutputvoltageandtheabilitytocontroltheIDF(inputdisplacementfactor).Attheendofthispapersimulationandexperimentalresultsareintroducedwhichgiveapreciseprooftotheproposedalgorithms.

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简介：在这份报纸，完整的分离本地设计稳定了(LPS)方法被建议与相等的顺序元素解决不稳定的海军司烧方程的最佳的控制问题。对流效果和压力被使用LPS方法两个都稳定。一个priori错误关于雷纳兹一致地估计数字被获得，提供真答案是足够的光滑。数字实验被实现说明并且证实我们的理论分析。

简介：TheinverseFaradayeffectinducedinmagneticfilmsbyultrashortlaserpulsesallowsexcitationandcontrolofspinsatgigahertzandsub-terahertzfrequencies.Thefrequencyoftheopticallyexcitedmagnetizationprecessioniseasilytunablebytheexternalmagneticfield.Ontheotherhand,theinitialphaseoftheprecessionmarginallydependsonthemagneticfield.Herewedemonstrateanapproachforthecontroloftheprecessionphasebyvariationofthepumpbeamdirection.Inparticular,weconsiderthecasewhenthemagnetizationprecessionisexcitedbyobliquelyincidentpumppulsesinamagneticdielectricfilmplacedinthein-planemagneticfield.Theoreticalconsiderationpredictsthattheinitialphaseshouldappearforanon-zeroin-planecomponentofthepumpwavevectororthogonaltotheexternalmagneticfield.Experimentalstudiesconfirmthisconclusionandrevealthatthephasegrowswithincreaseofthein-planewavevectorcomponent.Variationofphaseby15degisdemonstrated.Potentially,thephasecouldbechangedevenmorepronouncedlybymorethan90deg.Thisworkprovidesasimplewayforadditionalmanipulationwithopticallyexcitedmagnetizationdynamics,whichisofimportancefordifferentspintronicapplications.

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简介：在这份报纸，我们调查异构的多尺度的方法(唔)为有分布式的控制的最佳的控制问题，限制与高度摆动的系数由椭圆形的方程管理了。州的可变、有肋骨的变量被依靠联合的宏和微有限元素的多尺度的discretization计划接近，而控制变量是由piecewise常数的discretized。由把著名狮子词根用于discretized最佳的控制问题，我们获得必要、足够的optimality条件。在L2和H1标准的Apriori错误估计为状态被导出，有肋骨并且有制服的控制变量绑了常数。最后，数字例子被举说明我们的理论结果。

简介：因为graphene和phosphorene，二维(2D)组IV和组V元素的分层的材料引起大兴趣。然而，组IVV单层没收到到期的注意。在这个工作，啜单层的三种类型计算地被设计探索他们的电子结构和光性质。计算证实这些单层的稳定性，它都是有在范围的bandgaps的indirect-bandgap半导体1.382.21eV。bandgaps在pH=跨骑水的氧化还原作用潜力0，用作watersplitting光催化剂显示单层的潜力。计算光性质证明啜2D材料的某些单层是可见的光的吸收器并且将用作optoelectronic设备的好候选人。

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