简介：Canearthquakesbepredicted?Howshouldpeopleovercomethedifficultiesencounteredinthestudyofearthquakeprediction?Thisissuecantakeinspirationfromtheexperiencesofweatherforecast.Althoughweatherforecastingtookaperiodofabouthalfacenturytoadvancefromempiricaltonumericalforecast,ithasachievedsignificantsuccess.AconsensushasbeenreachedamongtheChineseseismologicalcommunitythatearthquakepredictionmustalsodevelopfromempiricalforecastingtophysicalprediction.However,itisseldommentionedthatphysicalpredictionischaracterizedbyquantitativelynumericalpredictionsbasedonphysicallaws.Thisarticlediscussesfivekeycomponentsfornumericalearthquakepredictionandtheircurrentstatus.Weconcludethatnumericalearthquakepredictionshouldnowbeputontheplanningagendaanditsroadmapdesigned,seismicstationsshouldbedeployedandobservationsmadeaccordingtotheneedsofnumericalprediction,andtheoreticalresearchshouldbecarriedout.

简介：NumericaltechniquesplayanimportantroleinCFD.Someofthemarereviewedinthispaper.ThenecessityofusinghighorderdifferenceschemeisdemonstratedforthestudyofhighReynoldsnumberviscousflow.Physicalguidelinesareprovidedfortheconstructionofthesehighorderschemes.Toavoidundulyadhoctreatmentintheboundaryregiontheuseofcompactschemeisrecommendedbecauseithasasmallstencilsizecomparedwiththetraditionalfinitedifferencescheme,BesidespreliminaryFourieranalysisshowsthecompactschemecanalsoyieldbetterspaceresolutionwhichmakesitmoresuitabletostudyflowwithmultiscalese.g.turbulence.Otherapproachessuchasperturbationmethodandfinitespectralmethodarealsoemphasized.Typicalnumericalsimulationswerecarriedout.ThefirstdealswithEulerequationstoshowitscapabilitiestocaptureflowdiscontinuity.TheseconddealswithNavier-Stokesequationsstudyingtheevolutionofamixinglayer,thepertinentstructuresatdifferenttimesareshown.Asymmetricbreakdownoccursandalsotheappearanceofsmallvortices.

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简介：Inthispaper,wepresentthecurrentstatusoftheprojectfordevelopingthenumericallibrayrinJAVA.Wehavepresentedhowobject-orientedtechniquesimproveusageandalsodevelopmentofnumericallibrariescomparedwiththeconventionalwayatpreviousconference,weneedmanyfunctionsfordataanalysiswhichisnotprovidedwithinJAVAlanguage,forexample,goodrandomnumbergenerators.specialfunctionsandsoon.Ourdevelopmentstrategyisfocusedoneasinessofimplementationandaddingnewfeaturesbyusersthemselvesnotonlybydevelopers.InHPCfiled,thereareotherfocuseffortstodevelopnumericallibrariesinJAVA,However,theirfocusisontheperformanceofexecution.noteasinessofextension.Followingthestrategy,wehavedegignedandimplementedmoreclassesforrandomnumbergeneratorsandsoon.

简介：Inthispaper,atwo-dimensionalprimitiveequationmodel,couplingdynamical,radiativeandphotochemicalprocesses,isusedtosimulatethequasi-biennialoscillation(QBO)inozone.TheQBOintotalozonehasbeensuccessfullysimulatedwhentheforcingofequatorialstratosphericQBOinzonalwindisimposed.ThesimulatedcharactersofQBOinozoneareincloseagreementwiththoseobserved.WefurtheranalyzedthemechanismofformationandmaintenanceofQBOinozone.InthedifferentphasesofQBOinequatorialstratosphericwindfield,theglobalcirculationhassogreatdifferencethatitmakestheeffectsofadvectiontransferandeddytransferpresentaquasi-biennialperiodicalvariation.Chemicaleffectanddynamicaleffectarebasicallyout-of-phase.TheytogetherformandmaintaintheQBOinozone.Totalvariationrateisatinydifferenceofthetwolargeamounts.Atthelowerlevelofmiddle-highlatitudes,however,ithasaphasedifferenceofabout1-2monthsbetweendynamicalandnegativechemicaleffects,wherethedynamicaleffectiscomparativelygreater.QBOinozonehasnoclearcountereffectsonatmosphericcirculation.TheexperimentresultsshowthattheeffectsofQBOinozoneontemperaturefieldandwindfieldareverysmall.

简介：-Inthispaperasimpleandefficientimplicitfinite-differenceschemeisusedfordepth-averagedtwo-dimensionalstormsurgemodel.Thisfinite-differenceschemeissimplerandmoreefficientthanthewi-dely-usedADIscheme.Accuracyanalysisandstabilityanalysisindicatethattheschemehastwo-orderac-curacyandisunconditionallystablewhenthegridsizeisconstant.ThepresentanalysisresultsshowthattheschemeisofhighernumericalaccuracythanthatintroducedbyMaa(1990).Aftertestedbyidealmod-els,acalculationexampleofarealtyphoonsurgeiscarriedout,theresultsofthenumericalsimulationco-incidewellwiththeobserveddataandtheaccuracyissufficientforengineeringapplications.

简介：A2-Dslab-symmetricmodelofmixedconvective-stratiformcloudisdevelopedbysuperimposingconvectivecloud-sizefieldontheconvergencefield,inordertosimulateandstudythemixedcloudsconsistingofstratiformcloudandconvectivecloud.Adeepconvective,anelasticandconservativesystemofequationswithbasicvariables(V,θ,π’)issolvedbyanewmethodtocalculatedynamicfield.Thewatersubstanceinthecloudisdividedinto6categoriesandthemicrophysicalprocessesaredescribedinspectrumwithtwovariableparametersandmorereasonableparticlenumber/sizedistributions.Tocomparewithmeasuredradarechointensityandstructure,themodelmaycalculateechointensityofthemodelcloudobservedbyradar.

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简介：在这份报纸，我们学习联合与ILU(0)因式分解过滤分解的修改正切的频率的合成preconditioner。光谱合成preconditioner的性质被Fourier分析的途径检验。我们由合成preconditioner说明preconditioned矩阵的那个条件数字被Oasymptotically围住(...)在一个标准模型问题上。合成preconditioner的性能与与不连续的系数从PDE的discretization产生的几个问题上的另外的preconditioners相比。数字结果证明建议合成preconditioner的性能比另外的相对preconditioners优异。[从作者抽象]

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简介：AimsandScope:NumericalMathematics:Theory,MethodsandApplications(NM-TMA)publisheshigh-qualityoriginalresearchpapersontheconstruction,analysisandapplicationofnumericalmethodsforsolvingscientificproblems.Importantresearchandexpositorypapersdevotedtothenumericalsolutionofmathematicalproblemsarisinginallareasofscience

简介：Theunbondedflexiblepipeofeightlayers,inwhichallthelayersexceptthecarcasslayerareassumedtohaveisotropicproperties,hasbeenanalyzed.Specifically,thecarcasslayershowstheorthotropiccharacteristics.Theeffectiveelasticmoduliofthecarcasslayerhavebeendevelopedintermsoftheinfluenceofdeformationtostiffness.Withconsiderationoftheeffectiveelasticmoduli,thestructurecanbeproperlyanalyzed.Alsotherelativemovementsoftendonsandrelativedisplacementsofwiresinhelicalarmourlayerhavebeeninvestigated.Athree-dimensionalnonlinearfiniteelementmodelhasbeenpresentedtopredicttheresponseofflexiblepipesunderaxialforceandtorque.Further,thefrictionandcontactofinterlayerhavebeenconsidered.Comparisonbetweenthefiniteelementmodelandexperimentalresultsobtainedinliteraturehasbeengivenanddiscussed,whichmightprovidepracticalandtechnicalsupportfortheapplicationofunbondedflexiblepipes.

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简介：Themechanicsofflowinggranularmaterialssuchascoal,sand,metaloresetc.,hasreceivedconsiderableattentionintherecentyearsasithasrelevancetoseveralimportanttechnologicalproblems.Thegoverningequationsfortheflowofgranularmaterials,arederivedusingamodelbasedonthekinetictheoryapproach[cf.BoyleandMas-soudi(1990)].Forafullydevelopedflowofthesemeterialsdownaninclinedplane,theequationsreducetoasystemofcouplednon-linearordinarydifferentialequations.Theresultingboundaryvalueproblemissolvednumericallyandaparametricstudyiscarriedouttodelineatehowthevariousnon-dimensionalparametersaffectthestructureofthesolution.

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简介：exergy分析就在葡萄牙(修剪的森林残余和藤)生产的甲烷和agro工业的残余的燃烧而言被执行。关于一个热力学的过程的不能反逆的性能是路径依赖者，燃烧过程作为各源于不同假想路径正在认为一个人由四主要子进程描绘了：混合的反应物，燃料氧化，内部热精力交换(热转移)，并且产品混合。exergetic效率用使用可视化Basic家代码开发的零个维的模型被计算。exergy损失主要由于内部热精力交换子进程，这被结束。当没有以前的燃料氧化，反应物被预热直到点火温度时，从这子进程的exergy损失更高。在另一方面，全球exergy破坏能是在氧化剂溪流上增加压力，反应物温度和氧内容的minored。这方法论允许有更大的exergy损失的现象和进程的鉴定，这些损失为什么并且怎么发生的理解有联系到对关键的每个系统的参数的exergy变化作为一种竞争技术从生物资源产品实现syngas燃烧。

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简介：Inthispaper,wedevelopGaussianquadratureformulasfortheHadamardfi-nitepartintegrals.Inourformulas,theclassicalorthogonalpolynomialssuchasLegendreandChebyshevpolynomialsareusedtoapproximatethedensityfunctionf(x)sothattheGaussianquadratureformulashavedegreen-1.Theerrorestimatesoftheformulasareobtained.Itisfoundfromthenumericalexamplesthattheconvergencerateandtheaccu-racyoftheapproximationresultsaresatisfactory.Moreover,therateandtheaccuracycanbeimprovedbychoosingappropriateweightfunctions.