简介:IntroductionErrorsareunavoidableinlanguagelearning,however,toagreatextent,teachersinmostmiddleschoolsinChinaregarderrorsasundesirable,asignoffailureinlanguagelearning.Mostmiddleschoolsarestillusingthegrammar-translationmethodwhichaimsatencouragingstudentstoreadscientificworksandenjoyliteraryworks.Theothergoalsofthismethodaretogainagreaterunderstandingofthefirstlanguageandtoimprovethestudents’abilitytocopewithdifficultsubjectsandmaterials,i.e.todevelopthestudents’minds.Thepracticalpurposeofusingthismethodistohelplearnerspasstheannualentranceexamination."Toachievethesegoals,thestudentsmustfirstlearngrammarandvocabulary,...Grammaristaughtdeductivelybymeansoflongandelaborateexplanations...studentslearntherulesofthelanguageratherthanitsuse."(TangLixing,1983:11-12)
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简介:那结果的消除是解决multivariate多项式方程的一个有效方法,是众所周知的。在这份报纸,而不是由可变消除经由变量计算目标resultants,作者联合multivariate含蓄的方程插值和multivariate计算减少的resultants的结果的消除,在哪个multivariate的技术含蓄的方程插值被一些高概率算法在multivariate多项式插值和univariate上完成合理函数插值。作为结果的消除的应用,作者在三个著名未解决的组合几何优化问题上说明建议算法。实验证明结果的消除的建议途径比某存在更有效这些困难的问题上的结果的消除方法。
简介:COMPLETECONVERGENCEOFERRORVARIANCEESITIMATESUNDER¢-MIXINGERRORINLINEARMODELSXueLiugen(薛留根)(XuchangTeachersCollege,Henan461000...
简介:基因子集选择为microarray数据的分类和分析是必要的。然而,自从基因表示数据,基因选择被知道是一项很困难的任务不仅有高维数,而且包含冗余的信息和噪音。应付这些困难,这份报纸介绍基于的预处理途径二个主要步骤填写了的模糊逻辑。首先,我们使用模糊推理规则把给定的数据集的基因表达式层次转变成模糊的值。然后,我们把一种类似关系用于这些模糊价值定义模糊等价组,包含强烈类似的基因的每个组。尺寸减小被基于相互的信息为每组类似的基因考虑一个单个代表完成。为了估计这的实用性,来临,广泛的试验用三个统计过滤器和三个分类器与一个联合分类模型一起在三著名公共数据集上被执行。
简介:Thepurposeofthispaperistostudythedynamicalmechanismoferrorgrowthinthenumericalweatherprediction.Theerrorisdefinedinthesenseofgeneralizedenergy,simplycalledenergyerror.Fromthespectralformoftheprimi-tiveequations,wehavederivedtheevolutionequationsoferrorindetail.Theanalysesoftheseequationshaveshownthattheerrorgrowthrateisdeterminedbythetangentlinearequations.Thenonlinearadvectioncausedbytheerrorperturbationitselfcontributesnothingtotheerrorgrowthrate,andonlyredistributestheerror.Furthermore,anap-proachtocalculationoftheerrorgrowthratehasbeendeveloped,whichcanalsobeusedtostudythelocalinstabilityoftime-independentbasicstateaswellastime-dependencebasicstate.Thisapproachisappliedtowell-knownLorenz’ssystem,andtheresultsareindicativeofthecorrectnessandsignificanceofthetheoreticalanalyses.
简介:Laser-inducedbreakdownspectroscopy(LIBS)isapromisinganalyticalspectroscopytechnologybasedonspectroscopicanalysisoftheradiationemittedbylaser-producedplasma.However,forquantitativeanalysisbyLIBS,theso-calledself-absorptioneffectsonthespectrallines,whichaffectplasmacharacteristics,emissionlineshapes,calibrationcurves,etc,cannolongerbeneglected.Hence,understandinganddeterminingtheself-absorptioneffectsareofutmostimportancetoLIBSresearch.Thepurposeofthisreviewistoprovideaglobaloverviewofself-absorptioninLIBSontheissuesofexperimentalobservationsandadverseeffects,physicalmechanisms,correctionoreliminationapproaches,andutilizationsinthepastcentury.Webelievethatbetterunderstandingandeffectivesolvingtheself-absorptioneffectwillfurtherenhancethedevelopmentandmaturityofLIBS.
简介:managementsoliton(CSDDMS)被解释的集中的慢慢地减少的分散的概念,和在在散布的multi-photonnonlinear康普顿下面的全部的内部反射photonic水晶纤维(TIRPCF)的solitonpropagation的非线性的Shroedinger方程(NSE)被给。通过由步用Fourier这个方程解决,它在某些条件下面被发现那,soliton夫妇变得进thequasi-solitons,谁的振幅和宽度慢慢地并且周期性地被改变,但是有任何碰撞。在TIRPCFusing消除光soliton的裂口和变丑的一个新方法CSDDMS被建议。
简介:Thispaperdeducedamoregeneralerrordistribution,thep-thpow-ernormdistribution,basedonthefoundationalpropertiesofrandomerrors.