简介：Grounddeformationmaybecausedbycrustalmovementandnon-crustalmovement.Thenon-crustalmovementsincludethosecausedbytemperature,rainfall,groundwater,etc.Deformationcausedbycrustalmovementincludesseismogenicdeformation(thatappearingintheprocessofearthquakepreparationandthatdirectlycausedbytheearthquake)andgeneraltectonicactivities.Thekeypointinthestudyoftherelationshipbetweengrounddeformationandearthquakesishowtoeliminateinformationofdeformationcausedbynon-crustalmovementandpermanent(orslow)tectonicdeformationinobserveddata.InthispaperananalysisismadeontheshortlevelingdatarecordedatDahuichangDeformation-ObservingStation,Beijing,for22years(1970-1991)byusingtheLMSalgorithmmethodafterlateraladaptivefilteringofthemoderndigitalsignalprocessingtechnique.Eliminatingtheapproximateannualvariationindeformationcausedbynon-crustalmovementsuchastemperature,rainfall,groundwater,etc.,aunifiedstandardis

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简介：Thispaperconsiderstheone-dimensionaldissipativecubicnonlinearSchrdingerequationwithzeroDirichletboundaryconditionsonaboundeddomain.Theequationisdiscretizedintimebyalinearimplicitthree-levelcentraldifferencescheme,whichhasanalogousdiscreteconservationlawsofchargeandenergy.Theconvergencewithtwoordersandthestabilityoftheschemeareanalysedusingaprioriestimates.Numericaltestsshowthatthethree-levelschemeismoreefficient.

简介：Thepaperisconcernedwithstronglynonlinearsingularlyperturbedbound-aryvalueproblemsinonedimension.Theproblemsaresolvednumericallybyfinite-differenceschemesonspecialmesheswhicharedenseintheboundarylayers.TheBakhvalovmeshandaspecialpiecewiseequidistantmeshareanalyzed.Forthecentralscheme,errorestimatesarederivedinadiscreteL~1norm.Theyareofsecondorderanddecreasetogetherwiththeperturbationparameterε.Thefourth-orderNumerovschemeandtheShishkinmesharealsotestednumerically.Numericalresultsshowε-uniformpointwiseconvergenceontheBakhvalovandShishkinmeshes.

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简介：实验可能性的在许多不同场合被发现很有用。当时，它通常跑进严重计算困难当适用于一些复杂统计时，实验可能性的(JEL)被显示出有效的大折刀。在这份报纸，到二线性回归的系数之间的差别建模的测试，作者使用JEL构造信心区域。基于JEL比率测试，Wilks定理的一个版本被开发。而且，改进信心区域的范围精确性，巴特利特修正被使用。模拟研究被执行在范围精确性的方面显示出建议方法的有效性。一个真实数据集合作为一个例子与建议方法被分析。

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简介：这篇论文为解决大规模学习一个替换secant/finite差别(SSFD)方法稀少的非强迫的优化问题。这个方法是一个正割方法和一个有限差别方法的联合，它取决于麻袋布矩阵的更低的三角形的部分的列的一个一致分区。q-superlinear集中结果和anr集中率估计证明这个方法有好本地集中性质。这个方法可能与一些是竞争的Thenumerical结果表演当前使用了算法。

简介：在在多重线性回归(MLR)之间的季节的降水预报技巧的差别的调查整体并且简单多，模型整体平均数(他们)基于单个模型的预报质量。在以前的研究的差别的可能的原因被分析。以便做学习区域的模拟能力相对一致，有不同时间的关联系数的三个区域为这研究被选择。结果证明导致MLR途径的无能力的原因在不同区域之中变化。在Niño3.4区域，在单个模型以内的强壮的合作线性通常是主要原因。在高纬度区域，然而，没有重要合作线性能在单身的模型的单个模型，而是能力被发现是那么差的它在这个区域为超级整体预报使MLR来临不恰当。另外，当我们比较源于的结果时，注意各种各样的分数大小的使用能导致一些差异是重要的不同多为整体途径建模。

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简介：在这篇论文的摘要，有不一致的网孔的一个差别计划为非线性的抛物线的系统的起始边界的问题被建议。差别计划是在空间和时间会聚的第二份订单，这被证明。

简介：对线线的描述拓扑的关系尽管许多努力被做了，仍然是一个未解决的问题。这个问题涉及象空间质问，空间分析和制图综合那样的许多实际应用。开发一条健全、有效的途径描述线线关系，它是第一必要排队定义一个个人的拓扑学，即，本地拓扑学。连接的度的概念在一根线的几何结构被用于拓扑的差别的鉴定。一根线的一般拓扑的定义被给，即，端点集合和内部点设定。这个定义能被用于不同尺寸的嵌入的空格，合作尺寸是否等于或比零大。在这个基础上，打电话给4intersection-and-difference的一个通用模型为对基本线线的描述被建立拓扑的关系，一张概念的邻居图与拓扑的距离的考虑在之上被造。建议模型能在/R~1和/R~2代表在线片断之间的拓扑的变化，和基本关系的性质，这被结束。

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简介：Afinitedifferencemethodispresentedtosimulatetransversevibrationsofanaxiallymovingstring.Bydiscretizingthegoverningequationandtheequationofstress-strainrelationatdifferentfrictionalknots,twolinearsparsefinitedifferenceequationsystemsareobtained.Thetwoexplicitdifferenceschemescanbecalculatedalternatively,whichmakethecomputationmuchmoreefficient.Thenumericalmethodmakesthenonlinearmodeleasiertodealwithandoftruncationerrors,O(Δt~2+Δx~2).Italsoshowsquitegoodstabilityforsmallinitialvalues.Numericalexamplesarepresentedtodemonstratetheefficiencyandthestabilityofthealgorithm,anddynamicanalysisofaviscoelasticstringisgivenbyusingthenumericalresults.

简介：Scatteringattenuationinshortwavelengthshaslongbeeninterestingtogeophysicists.Ultrasoniccodawaves,observedasthetailportionofultrasonicwavetrainsinlaboratoryultrasonicmeasurements,areimportantforsuchstudieswhereultrasonicwavesinteractwithsmallscalerandomheterogeneitiesonascaleofmicrometers,butoftenignoredasnoisesbecauseofthecontaminationofboundaryreflectionsfromthesideendsofasamplecore.Numericalsimulationswithaccurateabsorbingboundarycanprovideinsightintotheeffectofboundaryreflectionsoncodawavesinlaboratoryexperiments.Thesimulationofwavepropagationindigitalandheterogeneousporouscoresreallychallengesnumericaltechniquesbydigitalimageofporoelasticproperties,numericaldispersionathighfrequencyandstrongheterogeneity,andaccurateabsorbingboundaryschemesatgrazingincidence.Toovercomethesedifficulties,wepresentastaggered-gridhigh-orderfinite-difference(FD)methodofBiot’sporoelasticequations,withanarbitraryeven-order(2L)accuracytosimulateultrasonicwavepropagationindigitalporouscoreswithstrongheterogeneity.Anunsplitconvolutionalperfectlymatchedlayer(CPML)absorbingboundary,whichimprovesconventionalPMLmethodsatgrazingincidencewithlessmemoryandbettercomputationalefficiency,isemployedinthesimulationtoinvestigatetheinfluenceofboundaryreflectionsonultrasoniccodawaves.Numericalexperimentswithsaturatedporoelasticmediademonstratethatthe2LFDschemewiththeCPMLforultrasonicwavepropagationsignificantlyimprovesstabilityconditionsatstrongheterogeneityandabsorbingperformanceatgrazingincidence.TheboundaryreflectionsfromtheartificialboundarysurroundingthedigitalcoredecayfastwiththeincreaseofCPMLthicknesses,almostdisappearingattheCPMLthicknessof15grids.ComparisonsoftheresultingultrasoniccodaQscvaluesbetweenthenumericalandexperimentalultrasonicSwaveformsforacylindricalrocksampledemonstratethatthe

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简介：本文对依赖于过去的死亡率和出生率的年龄结构人口动力学模型建立了一个三层特征差分格式，证明了这一差分格式在离散无穷范数下是二阶收敛的

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简介：BytheaidofanideaoftheweightedENOschemes,someweight-typehigh-resolutiondifferenceschemeswithdifferentordersofaccuracyarepresentedinthispaperbyusingsuitableweightsinsteadoftheminmodfunctionsappearinginvariousTVDschemes.Numericalcomparisonsbetweentheweightedschemesandthenon-weightedschemeshavebeendoneforscalarequation,one-dimensionalEulerequations,two-dimensionalNavier-StokesequationsandparabolizedNavier-Stokesequations.

简介：Someofthemaincoolingprocessesandequipmentthatarecurrentlybeingusedinthecontinuousannealingprocessline(CAPL)atBaosteelareintroduced,aswellastheircoolingcontrolmodeltechniques,themodelingprincipiumandtheirapplicationresults.Withchartsindicatingthecontroltrendsinrealprocesses,thepowerfuladjustingabilityofthecontrolmodelswithprocessvariabledifferencesandtheirexcellentcontrolprecisionareshowninthisstudy.