简介：飞行自古以来就是人们的梦想，为了这一梦想，许多人努力付出，甚至付出了生命的代价终于，人们的努力有了回报，飞机的发明解决了人们的飞行难题。最近几年来，聪明的人们发明了一些可以让人自由飞行的新玩意，让我们在本文中了解一下其中的两件吧：纤维翅鹏：和飞行汽车、

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简介：LetRbeafinitechainringwithmaximalidealγandresiduefieldF,andletγbeofnilpotencyindext.ToeverycodeCoflengthnoverR,atowerofcodesC=(C:γ0)(C:γ)(C:γi)(C:γt-1)canbeassociatedwithC,whereforanyr∈R,(C:r)={e∈Rn|re∈C}.UsinggeneratorelementsoftheprojectionofsuchatowerofcodestotheresiduefieldF,wecharacterizecycliccodesoverR.ThischaracterizationturnstheconditionforcodesoverRtobecyclicintooneforcodesovertheresiduefieldF.Furthermore,weobtainacharacterizationofcycliccodesovertheformalpowerseriesringofafinitechainring.

简介：UsingafixedpointtheoremofKrasnosel'skiitype,thisarticleprovestheexistenceofasymptoticallystablesolutionsforaVolterra-Hammersteinintegralequationintwovariables.

简介：Inthisnote,theauthorprovethatmaximalBocher-RieszcommutatorBbδ,generatedbyoperatorBδ,andfunctionb∈BMO(ω)isaboundedoperatorfromLp(μ)intoLp(ν),whereω∈(μν-1)1p,μ,ν∈Apfor1

简介：我们调查了之间的差别同温层(S类型)并且在intraseasonal时间的tropospheric(T类型)北极摆动(AO)事件可伸缩，以他们对表面空气温度的影响(坐)在北半球和与他们的空间结构联系的动态特征上。S类型AO事件证明一个平流层对流层联合了结构，当T类型事件展出了一个平流层对流层时解开的结构。在北半球上的环形的容纳的异例被发现与S类型AO事件被联系，而如此的一个环形的特征是实质地在T类型AO事件的destructed。在二种类型的对流层的不同水平结构能主要被归因于强迫的短暂旋涡反馈。至于Ttype事件的垂直地解开的结构，把他们区分开来与S类型事件的内在的动态特征在地带地限制的Rossby波浪的垂直繁殖躺着。在T类型事件，在一垂直波导存在的地方，地带地限制的Rossby波浪包能在东北亚洲上从重要高度异例发出，然后向上宣传进平流层。相反，如此的垂直繁殖不为S类型事件是明显的。在T类型事件从对流层与地带地限制的Rossby波浪的向上的注射联系的同温层的异例能进一步通过在climatological想PW和异常PW之间的干扰导致行星的波浪(PW)的异常垂直繁殖，导致最后的平流层对流层T类型事件的解开的结构。

简介：TwofieldexperimentswereperformedinordertodissipatethefogatWuqingDistrictofTianjininNovemberandDecemberof2009.Hygroscopicparticleswereseededtodissipatefogdropletson6-7November,2009.Liquidnitrogen(LN)wasseededintothenaturalsupercooledfogintheexperimentsof30November–1December,2009.Significantresponsewasfoundafterseeding.Significantchangeswereobservedinthemicrostructureoffoginthefieldexperiments.Theoffogdropletchangeddramatically;itincreasedfirstandthendecreasedafterseeding.RemarkablevariationalsowasfoundintheLiquidWaterContent(LWC)andinthesizeoffogdroplet.TheDropletSizeDistribution(DSD)offogbroadenedduringtheseedingexperiments.TheDSDbecamenarrowaftertheseedingended.Afterseeding,thedropletswerefoundtobeatdifferentstagesofgrowth,resultinginatransformofDSDbetweenunimodaldistributionandbimodaldistribution.TheDSDwasunimodalbeforeseedingandthenbimodalduringtheseedingexperiment.Finally,theDSDbecameunimodallydistributedonceagain.

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简介：在这研究，一条新分析途径被开发分析保守two-degree-of-freedom(TDOF)的免费非线性的颤动系统。这些系统的数学模型被秒顺序管理非线性的部分微分方程。非线性的微分方程被使用一些中间的变量变成一个单个方程。单个非线性的微分方程被使用Hamiltonian途径的第一份订单解决(哈)。不同参数，在系统的反应上有重要影响，被考虑并且讨论。一些比较被介绍验证在Hamiltonian途径和准确答案之间的结果。最大的相对错误是为颤动的大振幅的不到2.2124%。Hamiltonian途径的第一次重复完成很精确的结果，这被建立了，不要求任何小不安，并且能被用于大量非线性的问题。

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简介：让(u?弈吗？？

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简介：WeconsideranMX/G/1queueingsystemwithtwophasesofheterogeneousserviceandBernoullivacationschedulewhichoperateunderalinearretrialpolicy.Inaddition,eachindividualcustomerissubjecttoacontroladmissionpolicyuponthearrival.ThismodelgeneralizesboththeclassicalM/G/1retrialqueuewitharrivalsinbatchesandatwophasebatcharrivalqueuewithasinglevacationunderBernoullivacationschedule.Wewillcarryoutanextensivestationaryanalysisofthesystem,includingexistenceofthestationaryregime,embeddedMarkovchain,steadystatedistributionoftheserverstateandnumberofcustomerintheretrialgroup,stochasticdecompositionandcalculationofthefirstmoment.

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简介：Inthepaper,anexperimentinvestigationwasconductedforone-andtwo-degreeoffreedomvortex-inducedvibration（VIV）ofahorizontally-orientedcylinderwithdiameterof11cmandlengthof120cm.Intheexperiment,thespringconstantsinthecross-flowandin-lineflowdirectionswereregulatedtochangethenaturalvibrationfrequencyofthemodelsystem.Itwasfoundthat,intheone-degreeoffreedomVIVexperiment,a＂doublepeak＂phenomenonwasobservedinitsamplitudewithintherangeofthereducedvelocitiestested,moreover,a＂2T＂wakeappearedinthevicinityofthesecondpeak.Inthetwo-degreeoffreedomVIVexperiment,thetrajectoryofcylinderexhibitedareverse＂C＂shape,i.e.,a＂newmoon＂shape.Throughanalysisofthesedata,itappearsthat,besidesthenon-dimensionalin-lineandcross-flownaturalvibrationfrequencyratios,theabsolutevalueofthenaturalvibrationfrequencyofcylinderisalsooneoftheimportantparametersaffectingitsVIVbehavior.

简介：Acompactammoniagassensorwithtwogaschambersisproposedinthispaper,whosecoresensingdeviceisaU-bendingmicroringresonator.Thewaveguidesofringpartandfeedbackpartinthisresonatoraremadeofsilicononinsulator(SOI)ridgewaveguidecoveredwithZnOnanocrystalswhicharesensitivetoammoniagas.Thesensorcanmeasuretwogroupsofgassamplessimultaneously.Bycomputersimulation,weobtaintheclearsensitivitycurvesoftwogaschambersinammoniasensorwhenthegasconcentrationincreasesfrom0to4‰.Thegasconcentrationsintwochamberscanbeobtainedfromoneoutputspectrum,whichsignificantlyreducesthematerialandtimeconsumption.

简介：这篇文章处理在从期末考试的反应散开系统的两次独立的系数预定空间discretized测量使用的重建的一个反的问题在光滑的插值技术的帮助下的优化方法。文章的主要目的是关于同类的Dirichlet边界条件分析线性地联合的反应散开系统的反的问题的解决方案的asymptotic行为。

简介：ThePolicyIsOnlytoAllowingCoupleswithOneSpouseBeinganOnly-childtoHaveTwoChildrenbutNottheSecondParityforOnly-childThelaunchofthenewfertilitypolicyhasreceivedwideattention.Canfamilieswithtwinshave

简介：Smoothedparticlehydrodynamics(SPH)isamesh-freeadaptiveLagrangianparticlemethodwithattractivefeaturesfordealingwiththefreesurfaceflow.ThispaperappliestheSPHmethodtosimulatethelarge-amplitudelateralsloshingbothwithandwithoutafloatingbody,andtheverticalparametrically-excitedsloshinginatwo-dimensionaltank.ThenumericalresultsshowthattheSPHapproachhasanobviousadvantageoverconventionalmesh-basedmethodsinhandlingnonlinearsloshingproblemssuchasviolentfluid-solidinteraction,andflowseparationandwave-breakingonthefreefluidsurface.TheSPHmethodprovidesanewalternativeandaneffectivewaytosolvethesespecialstrongnonlinearsloshingproblems.