简介：Forsomelargelydamagedships,theconventionalmethodsareunadaptabletoestimatetheirdynamiccharacteristicsastoshipswithsymmetricalhullsection.Basedondryhullmodalanalysisofflexure-torsioncouplingvibrationofunsymmetricalshipstructuresaboutlongitudinalcenterline,atransfermatrixmethodtocalculatethedynamiccharacteristicsispresented.Takenbothsheareffectandwarpingdeformationsintoaccount,thepointandfieldtransfermatricesarederived,andtheinflu-

简介：BymeansofthefrozentimeapproachandtheKroneckerproduct,twocriteriaofasymptoticstabilityarederivedforthelinear,timevariantdynamicsystemswitheithershorttimedelaysorwithweakfeedbackinvolvingarbitrarytimedelays,respectively.Itisfoundthattheasymptoticstabilityoftheseretardeddy-nainicsystemsisgovernedbythemaximalandminimalsingularvaluesofthecoeffi-cientmatricesandtheirtimederivatives.

简介：如果你能够看懂时钟，你就可以知道一天的时间．但是谁也不知道，时间本身究竟是什么．时间是看不到、摸不着、听不见的，我们只能通过记录时间消逝的办法才知道时间的存在，虽然我们成功地测量了时间的分分秒秒，但时间仍然是宇宙间极其神秘的现象之一。

简介：Onceuponatime,therewasanislandwhereallthefeelingslived:Happiness,Sadness,Knowledge,andalloftheothers,includingLove.Onedayitwasannouncedtothefeelingsthattheislandwouldsink,soallconstructedboatsandleft.ExceptforLove.

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简介：Theaimofthisstudyistodesignabiologicalinformationretrievalandanalysissystem(BIRAS)basedontheInternet.Usingthespecificnetworkprotocol,BIRASsystemcouldsendandreceiveinformationfromtheEntrezsearchandretrievalsystemmaintainedbyNationalCenterforBiotechnologyInformation(NCBI)inUSA.Theliteratures,nucleotidesequence,proteinsequences,andotherresourcesaccordingtotheuser-definedtermcouldthenberetrievedandsenttotheuserbypopupmessageorbyE-mailinformingautomaticallyusingBIRASsystem.Alltheinformationretrievingandanalyzingprocessesaredoneinreal-time.Asarobustsystemforintelligentlyanddynamicallyretrievingandanalyzingontheuser-definedinformation,itisbelievedthatBIRASwouldbeextensivelyusedtoretrievespecificinformationfromlargeamountofbiologicaldatabasesinnowdays.Theprogramisavailableonrequestfromthecorrespondingauthor.

简介：把技术基于数字图象处理，一个即时系统被开发监视并且检测设计结构的动态排水量。由用一个自我规划的软件处理图画，在某个坐标系统的一个目标的即时坐标能也被获得，并且推进动态排水量数据和目标罐头的曲线被完成。数据的也就是说自动的聚会并且即时处理能被这个系统同时执行。首先，为这个系统，一种未触动过的监视技术被采用，罐头它监视或检测目标几到几百米分开；第二，它有灵活安装状况和亚毫米度的好监视精确；第三，它是合适的为动态、伪动态、静态大工程结构监视。通过大桥的几测试和应用程序，系统的好可靠性和优势被证明。

简介：Afullycoupled6-degree-of-freedomnonlineardynamicmodelispresentedtoanalyzethedynamicresponseofasemi-submersibleplatformwhichisequippedwiththedynamicpositioning(DP)system.Inthecontrolforcedesign,adynamicmodelofreferencelineardriftfrequencyinthehorizontalplaneisintroduced.Thedynamicsurfacecontrol(DSC)isusedtodesignacontrolstrategyfortheDP.Comparedwiththetraditionalback-steppingmethods,thedynamicsurfacecontrolcombinedwithradialbasisfunction(RBF)neuralnetworks(NNs)canavoiddifferentiatingintermediatevariablesrepeatedlyineverydesignstepduetotheintroductionofafirstorderfilter.LowfrequencymotionsobtainedfromtotalmotionsbyalowpassfilterarechosentobetheinputsfortheRBFNNswhichareusedtoapproximatethelowfrequencywaveforce.Consideringthepropellers’wearandtear,theeffectoffilteringfrequenciesforthecontrolforceisdiscussed.Basedonpowerconsumptionsandpositioningrequirements,theNNcentersaredetermined.Moreover,theRBFNNsusedtoapproximatethetotalwaveforcearebuilttomonitorthedisturbances.WiththeDPassistance,theresultsoffullycoupleddynamicresponsesimulationsaregiventoillustratetheeffectivenessoftheproposedcontrolstrategy.

简介：Time-temperaturesuperpositionprinciple(TTSP)wasusedtoexaminedynamicviscoelasticpropertiesofChineseFir(Cunninghamialanceolata)woodatanextremelylowmoisturecontent(0.6%).Storagemodulusandlossfactordatawereobtainedatdifferentconstanttemperaturesrangingfrom25℃to150℃infrequencymultiplexingexperiments(0.1-20Hz).Allviscoelasticcurvesatothertemperatureswereshiftedalongthelog-frequencyaxistosuperimposethemonareferencetemperature(i.e.135℃inthisstudy)curve.Theextendedstoragemodulusandlossfactorisothermalmastercurveswereoverawiderangeoffrequency.TheshiftfactorsweredeterminedtobeafunctionoftemperatureandfittedintotheArrheniusequationwiththeleastsquaresmethod.TheresultsshowedthatthestoragemodulusdatawereexcellentlyfittedintotheArrheniusmodel,indicatingthevalidityofthemodeltocharacterizethedynamicstiffnessbehaviorofdrywoodintherangeof25-150℃usingtheTTSP.However,thetime-temperatureequivalencewasnotabletopredictthedampingproperties.

简介：Ｐｒｅｌｉｍｉｎａｒｙ　Ｓｔｕｄｙ　ｏｆ　Ｒｅｃｏｎｓｔｒｕｃｔｉｏｎ　ｏｆ　ａ　Ｄｙｎａｍｉｃ　Ｓｙｓｔｅｍ　Ｕｓｉｎｇ　ａｎ　Ｏｎｅ－Ｄｉｍｅｎｓｉｏｎａｌ　Ｔｉｍｅ　ＳｅｒｉｅｓＰｅｎｇＹｏｕｎｇｉｎｇ（彭永清）；ＺｈｕＹｕｆｅｎｇ（朱育峰）ａ...

简介：传统的被动吸收器在一个狭窄、肯定的频率乐队以内是充分有效的。解决这个问题，推迟时间的加速反馈被介绍把一个被动吸收器变换成活跃的。两固有并且故意的时间延期被包括。前者主要来自信号获得并且处理，计算，并且适用使活动力量，和它的值被修理。后者在控制器被介绍，并且它的价值是活跃地可调节的。第一，机械模型被建立，频率反应方程被获得。稳定性的区域在控制参数的飞机被描出。第二，控制帕拉的设计计划--米被执行帮助选择反馈获得和时间延期的值。第三，试验性的研究被进行。否定、积极的反馈控制的效果被调查。试验性的结果证明控制参数的合适的选择可以拓宽颤动吸收的有效频率乐队。而且，当被动吸收器完全失败时，推迟时间的吸收器极大地压制主要系统的反响的反应。试验性的结果在对理论预言和数字模拟的好同意。

简介：Andynamicsystemforreal-timeobstacleavoidancepathplanningofredundantrobotsisconstructedinthispaper.Firstly,theinter-framedifferencemethodisusedtoidentifythemovingtargetandtocalculatethetargetarea,thenonthebasisofcolorfeaturesandgradientfeaturesextractedfromthetargetarea,thefeaturefusionCam-Shiftmeanshiftalgorithmisusedtotracktarget,improvingtherobustnessofthetrackingalgorithm.Secondly,aparalleltwo-channeltargetidentificationandlocationmethodbasedonbinocularvisionisproposed,updatingthetarget’sthree-dimensionalinformationinrealtime.Then,adynamiccollision-freepathplanningmethodisimplemented:thesafetyrodsareremovedthroughtheintersectiontest,andtheminimumdistanceisderiveddirectlybyusingthecoordinatevaluesofthetargetinthelocalcoordinatesystemoftherod.Onthisbasis,theobstacleavoidancegainandescapevelocityrelatedtotheminimumdistanceisestablished,andobstacleavoidancepathplanningisimplementedbyusingthezerospacemappingmatrixofredundantrobot.Experimentsareperformedtostudytheefficiencyoftheproposedsystem.

简介：Roadfrictioncoefficientreal-timeestimationmethodsisanimportantissueandprobleminautomotiveactivesafetycontrolsystemdevelopment.Firstafixedfeedbackgainslidingmodeobserverofroadadhesioncoefficientisdesignedthroughtheestablishmentoftire/roaddynamicfrictionmodelinthisarticle.Thesimulationresultsshowsthattheobservercanwellreal-timeidentifythecurrentroadadhesioncharacteristics.Andmoreimportantly,theobserveronlyneedwheelspeedsignalandthebrakingtorque(brakepressure)signal,sothesystemislowcost,anditsadaptabilityisgood.Thereisnodoubtthisestimationmethodhasagoodapplicationprospect.

简介：Inthispaper,theoptimalcontrolofaclassofgeneralaffinenonlineardiscrete-time(DT)systemsisundertakenbysolvingtheHamiltonJacobi-Bellman(HJB)equationonlineandforwardintime.Theproposedapproach,referrednormallyasadaptiveorapproximatedynamicprogramming(ADP),usesonlineapproximators(OLAs)tosolvetheinfinitehorizonoptimalregulationandtrackingcontrolproblemsforaffinenonlinearDTsystemsinthepresenceofunknowninternaldynamics.Boththeregulationandtrackingcontro...

简介：有不规则的潜力和动态边界条件的Cahn-Hilliard方程被考虑。全球引起注意的人的存在被证明并且也就是，稳定的集中说的轨道的长时间行为，被学习。

简介：Ahybridanalysismethodintimeandfrequencydomainsforlinearsoil-structureinteractionispresented.First,thetimedomainsolutionofthesystemwithRayleighdampingexcitedbyashorttimeimpulseisobtainedbythedecouplingnumericalsimulationtechniqueofnear-fieldwavemotion.Then,thecorrespondingfrequencydomainsolutioncanbegotbyFouriertransform.Accordingtotherelationshipbetweendampingvalueanddynamicre-sponseofasystem,thesolutionofthesystemwithcomplexdampingcanbegotbyTaylorexpansion.Thehybridmethodmakesthebestofdecouplingandexplicitalgorithmintimedomain,andincreasesthecalculationefficien-cyforlinearsoil-structureinteractionanalysis.

简介：Givenanon-equidistantsequenceoranequidistantserieswithoneormoreoutliers,agreyinterpolationapproachconsideringthetimelagsisestablishedforproducingthemissingdataorcorrectingtheabnormalvalues.Toaccomplishthis,anewgreyincidencemodel,calledthegreydynamicincidencemodelGDIM(t),isconstructedfordeterminingwhetherthefactorsareeffectivetotheknownfactorandwhatthetimelagisbetweenausefulfactorandthespecifiedsequence.BasedontheresultsoftheGDIM(t)model,twoprogrammingproblemsaredesignedtoobtaintheupperandlowerboundsoftheunknownorabnormalvalueswhichareregardedasgreynumbers.Thesolutionsbasedontheparticleswarmoptimization(PSO)forthenonlinearprogrammingproblemsaregiven.Toexplainhowitcanbeusedinpractice,thisnewgreyinterpolationapproachisappliedtocorrectanabnormalvalueinthesequenceofanagricultureenvironmentproblem.

简介：受到时间依赖者脉搏的一个把压成薄片的混合合成盘子的非线性的动态回答被调查。板的动态方程被虚拟工作原则的使用导出。几何非线性效果与vonK獲愠敲搠灥湥敤瑮漠?瑳敲獳獥愠?桷捩?桴?桳晩獴愠敲愠灰楬摥?桷汩?桴?楴敭猭牴獥?桳晩?慦瑣牯?牡?敤数摮湥?湯琠浥数慲畴敲s被考虑

简介：在这个惜时如金的时代，大家的时间否都好好利用了呢？不知道大家是不是跟笔者一样，一使用电脑就忘记了时间，现在，我请来一了位好帮手，帮大家管理时间。

简介：<正>我在《杜鹃山》中扮演郑老万一角。在原话剧本中,郑老万是一个有着悲惨遭遇,饱经风霜的贫苦农民,他心地善良、忠厚老实、沉默寡言,但在关键时刻又能临危不惧,随机应变,对阶级兄弟感情深厚,对革命坚贞不