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494 个结果
  • 简介:TheEnglishconstruction'XandY'referstothecoordinationoftwowordswithandasconjunction,XandYbeingofthesamepartofspeechandparallelmeanings.ThispaperisacognitivestudyofthelinearorderoftheEnglishconstruction'XandY'fromtheperspectivesofcognitivesalience,cognitiveiconicity,andcognitionofformalrules.Thelinearcharacteristicsof'XandY'arerevealedasfollows:1)salience-downgradingorder;2)chronologicaliconicity;3)cognitionofalphabeticorderandprosodicorder.

  • 标签: 线性特性 认知研究 结构 英语 时间顺序
  • 简介:Split-stepPadémethodandsplit-stepfouriermethodareappliedtothehigher-ordernonlinearSchrdingerequation.ItisprovedthatacombinationofPadéschemeandspectralmethodisthemosteffectivemethod,whichhasaspectral-likeresolutionandgoodstabilitynature.Inparticular,weproposeanunconditionalstableimplicitPadéschemetosolveoddordernonlinearequations.NumericalresultsdemonstratetheexcellentperformanceofPadéschemesforhighordernonlinearequations.

  • 标签: 傅立叶方法 非线性微波传播 分散转移 计算机理论
  • 简介:Throughtheanalysisoftheprinciple,errorsourcesandprecisionoftrigonometricleveling,thispaperpointsoutthekeyproblemsaboutfirstorderlevelingreplacedbytrigonometricleveling;andforthefirsttimeputsforwardthat,insomegivenconditions,itisnotonlyfeasiblebutalsovaluabletoreplacefirstorderlevelingbyprecisetrigonometricleveling,andprovesitbyexperimentationaswell.Thecontentandconclusionofthispaperhaveconsultingsignificanceandpracticablevalueforoursettingdownrelationalcriterionandproductionpractice.

  • 标签: 三角法 水准测量 变形监测 平地
  • 简介:Alargeclassoflinearstructuralfunctions(LSF)satisfyingtheconditionofcorrelationalimmunityoforderoneareconstructedbystudyingthelinearstructuralBooleanfunctions.Withthesenewfoundedfunctions,theknownenumerationboundsofcorrelation-immunefunctionsoforderonearegreatlyimproved.Infact,thebest,uptonow,lowerboundisfound.

  • 标签: BOOLEAN FUNCTION STREAM ciphers Correlation-immune FUNCTION
  • 简介:Asthetheoryofthefractionalorderdifferentialequationbecomesmaturegradually,thefractionalorderneuralnetworksbecomeanewhotspot.TherobuststabilityofaclassoffractionalorderHopfieldneuralnetworkwiththeCaputoderivativeisinvestigatedinthispaper.ThesufficientconditionstoguaranteetherobuststabilityofthefractionalorderHopfieldneuralnetworksarederivedbymakinguseofthepropertyoftheMittag-Lefflerfunction,comparisontheoremforthefractionalordersystem,andmethodoftheLaplaceintegraltransform.Furthermore,anumericalsimulationexampleisgiventoillustratethecorrectnessandeffectivenessofourresults.

  • 标签: HOPFIELD神经网络 分数阶系统 鲁棒稳定性 Mittag-Leffler函数 微分方程理论 积分变换法
  • 简介:MULTIPLICITYRESULTSFORAFOURTH-ORDERBOUNDARYVALUEPROBLEMMaRuyun(马如云)MaQinsheng(马勤生)(ReceivedOct.5.1994:CommunicatedbyLinZongch...

  • 标签: clastic beam. beam. wow-parameter EIGENVALUE problem.
  • 简介:ThispaperisconcernedwithapplicationsofintegratedsemigroupstothefollowingCauchyproblem:(ACPn)xn(t)=sumfromi=0ton-1Bixi(t),xi(0)=xi,0(?)i(?)n-1whereBi(0(?)i(?)n-1)areclosedlinearoperatorsonaBanachspaceX.Auniquenesstheorem,aconditionofthesolvability,aconditionoftheexponentialwell-posedness,andsomeresultsforthespecialcasethatBn-1isboundedandD(Bn-2)(?)D(Bi)(0(?)i(?)n-3)areobtained.

  • 标签: Higher order abstract CAUCHY problem UNIQUENESS
  • 简介:Theobjectiveofthisstudyistoidentifysystemparametersfromtherecordedresponseofbaseisolatedbuildings,suchasUSChospitalbuilding,duringthe1994Northridgeearthquake.Fullstatemeasurementsarenotavailableforidentification.Additionally,theresponseisnonlinearduetotheyieldingofthelead-rubberbearings.Twonewapproachesarepresentedinthispapertosolvetheaforementionedproblems.First,areducedorderobserverisusedtoestimatetheunmeasuredstates.Second,aleastsquarestechniquewithtimesegmentsisdevelopedtoidentifythepiece-wiselinearsystemproperties.Theobserverisusedtoestimatetheinitialconditionsneededforthetimesegmentedidentification.Aseriesofequivalentlinearsystemparametersareidentifiedindifferenttimesegments.Itisshownthatthechangeinsystemparameters,suchasfrequenciesanddampingratios,duetononlinearbehaviorofthelead-rubberbearings,arereliablyestimatedusingthepresentedtechnique.Itisshownthattheresponsewasreducedduetoyieldingofthelead-rubberbearingsandperiodlengthening.

  • 标签: USC HOSPITAL building base isolation least
  • 简介:A。Kaneko和K。Ota证明了那为一最低限度地(n,λ)连接了图G,如果|G|=p≥3n-1,然后e(G)≤nλ(|G|-n);并且如果e(G)=nλ(|G|-n),当时,G对图K_同形(n,p-n)从完全的由两部组成的图K_被获得的~λ(n,p-n)由用λ代替每个边多重边;如果3n-1≥|G|≥n+1,然后e(G)≤λ(|G|+n)~2/8。在这篇论文,我们决定所有最低限度地(n,λ)与顺序p和最大的尺寸λ(p+n连接了图)为3n-1≥p≥n+的~2/81为3n-1≥p≥n+1。

  • 标签: 连通性 最小连接图 同构图 图论
  • 简介:为有抑制Δ~2x_n+p_nΔx_n+F的非线性的延期差别方程的一些新摆动标准(n,x_(n-τ),Δx_(n-σ))=0,n=0,1,2,...,(*)被给。我们的结果部分解决摆姿势在的开的问题[数学。Bohemica,125(2000),421-430]。另外,我们将为(*)的特殊情况建立一些新摆动标准,它在文学改进一些知道thewell的结果。

  • 标签: 二阶微分方程 振荡 非线性 时滞 阻尼
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  • 简介:Thispaperpresentsanewmethodbasedonasecond-orderstochasticmodelforcomputerintrusiondetection.Theresultsshowthattheperformanceofthesecond-orderstochasticmodelisbetterthanthatofafirst-orderstochasticmodel.Inthisstudy,differentwindowsizesarealsousedtotesttheperformanceofthemodel.Thedetectionresultsshowthatthesecond-orderstochasticmodelisnotsosensitivetothewindowsize,comparingwiththefirst-orderstochasticmodelandotherpreviousresearches.Thedetectionresultofwindowsizes6and10isthesame.

  • 标签: 侵入探测 随机模型 系统呼叫 通信
  • 简介:在这篇论文,我们在场一个不连续的Galerkin(DG)方法基于为解决在3-dimensional上从一个magnetohydrodynamics模型产生的一个第四顺序的卷屈方程的Nedelec有限元素空间围住Lipschitz多面体。我们证明方法为包含一个第四顺序的卷屈操作员的一个模型问题有最佳的错误估计。而且,在2种尺寸的一些数字结果被介绍验证理论结果。

  • 标签: 间断有限元 有限元方法 四阶 LIPSCHITZ 最优误差估计 有限元解
  • 简介:InthispaperweprovideaprobabilisticapproachtothefollowingDirichletProblem{(∑x4(αijxj)+∑bixi+ξ)u=0,iDu=g,onD,withoutassumingthattheeigenvaluesoftheoperator∑xi(αijxj)+∑bixi+ξwithDirichletboundaryconditionsareallstrictlynegative.TheresultsofthispapergeneralizedthoseofMa.

  • 标签: Dirichlet probabilistic BOREL opera STRICTLY VALUED