简介:Inthisreview,weintendtoclarifytheunderlyingideasandtherelationsbetweenvariousmultigridmethodsrangingfromsubsetdecomposition,toprojectedsubspacedecompositionandtruncatedmultigrid.Inaddition,wepresentanovelgloballyconvergentinexactactivesetmethodwhichiscloselyrelatedtotruncatedmultigrid.Thenumericalpropertiesofalgorithmsarecarefullyassessedbymeansofadegenerateproblemandaproblemwithacomplicatedcoincidenceset.
简介:IATEFL,theInternationalAssociationofTeachersinEnglishasaForeignLanguage,isanorgamsationforallprofessionalsinvolvedinEnglishLanguageteaching.Ithasbeeninexistencesince1968andhasgrownfromasmallorganisationbasedintheUKtothelargeoneitistodaywithover8,000membersworldwide.Whyhasitlastedandgrown?
简介:<正>Ethnomusicologyasanemergingdisciplinehasmanykindofstatement.ThroughreadingMkolinski’article《ThesubjectandmethodofEthnomusicology》andthinkofethnomusicologyresearch.TheethnomusicologyIntheprocessofdevelopmentusedtomanykindsofMethodologyandinthisarticlesothatmethodologybycomparingtheperiodscholarswecanfoundethnomusicologyinthecourseofhistory.Thisarticledescribesthemethodfromanumberofmusicologists.
简介:Number1GlobalSeaLevelChangeandThermalContributionZUOJuncheng,ZHANGJianli,DULing,LIPeiliang,andLILei
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简介:Theinitialvalueproblemsandthefirstboundaryproblemsforthequasilinearwaveequationutt-[a0+na1(ux)n-1]uxx-a2uxxtt=0areconsidered,wherea0,a2>0areconstants,a1isanarbitraryrealnumber,nisanaturalnumber.Theexistenceanduniquenessoftheclassicalsolutionsfortheinitialvalueproblemsandthefirstboundaryproblemsoftheequation(1)areprovedbytheGalerkinmethod.