简介:LetMbeanndimensionalcompleteRiemannianmanifoldsatisfyingthedoublingvolumepropertyandanon-diagonalheatkernelestimate.Thenecessary-sufficientconditionfortheSobolevinequality‖f‖q≤Cn,,v,p,q(‖▽f‖p+‖fp)(2≤p<q<∞)isgiven.
简介:Anewhigh-ordertime-steppingfiniteelementmethodbaseduponthehigh-ordernumericalintegrationformulaisformulatedforSobolevequations,whosecomputationsconsistofaniterationprocedurecoupledwithasystemoftwoellipticequations.Theoptimalandsuperconvergenceerrorestimatesforthisnewmethodarederivedbothinspaceandintime.Also,aclassofnewerrorestimatesofconvergenceandsuperconvergenceforthetime-continuousfiniteelementmethodisdemonstratedinwhichtherearenotimederivativesoftheexactsolutioninvolved,suchthattheseestimatescanbeboundedbythenormsoftheknowndata.Moreover,someusefula-posteriorierrorestimatorsaregivenonthebasisofthesuperconvergenceestimates.
简介:TheauthorsstudythesingularintegraloperatorTΩ,αf(x)=p.v.∫R^nb(|y|Ω(y′)|y|^-n-αf(x-y)dy,definedonalltestfunctionsf,wherebisaboundedfunction,α>0,Ω(y′)isanintegrablefunctionontheunitsphereS^n-1satisfyingcertaincancellationconditions.Itisprovedthat,forn/(n+α)<p<∞,TΩ,αisaboundedoperatorfromtheHardy-SobolevspaceH^pαtotheHardyspaceH^p.TheresultsanditsapplicationsimprovesometheoremsinapreviouspaperoftheauthorandtheyareextensionsofthemaintheoremsinWheeden'spaper(1969).TheproofisbasedonanewatomicdecompositionofthespaceH^pαbyHan,PaluszynskiandWeiss(1995).Byusingthesameproof,thesingluarintegraloperatorswithvariablekernelsarealsostudied.
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简介:Inthispaper,weconsiderthen-widthsandaveragewidthsofBesovclassesintheusualSobolevspaces.TheweakasymptoticresultsconcerningtheKolmogorovn-widths,thelinearn-widths,theGel'fandn-widths,intheSobolevspacesonT~d,andtheinfinite-dimensionalwidthsandtheaveragewidthsintheSobolevspacesonR~dareobtained,respectively.
简介:ThediscreteSobolev’sinequalitiesinL_pnormareprovedforthree-dimensionalsphericalandcylindricalcoordinates,byusingdiscreteHolderinequality.propertyofthetrianglefunctionsandcomplicateddeduction.
简介:Theinverseheatconductionproblem(IHCP)isaseverelyill-posedprobleminthesensethatthesolution(ifitexists)doesnotdependcontinuouslyonthedata.Butnowtheresultsoninverseheatconductionproblemaremainlydevotedtothestandardinverseheatconductionproblem.SomeoptimalerrorboundsinaSobolevspaceofregularizedapproximationsolutionsforasidewaysparabolicequation,i.e.,anon-standardinverseheatconductionproblemwithconvectiontermwhichappearsinsomeappliedsubjectaregiven.
简介:分算法(静止或非静止)是在小浪的最活跃、令人激动的研究话题之一分析和应用数学理论。处于多维的非静止的状况,它的限制功能简洁地两个都被支持并且无穷地可辨。另外,这些限制功能能用作可伸缩的功能产生多维非静止直角或biorthogonalsemi-multiresolution分析(Semi-MRAs)。光谱多维的nonstationarybiorthogonalSemi-MRAs的近似性质在这篇论文被考虑。基于放大函数的nonstationary分计划和它的限制,多维的nonstationarybiorthogonalSemi-MRAs有,这被显示出光谱在Sobolev空格H的近似顺序r[s](R[d]),为所有rs0。[从作者抽象]
简介:Inthispaper,westudythemixedelementmethodforSobolevequations.Atime-discretizationprocedureispresentedandanalysedandtheoptimalordererrorestimatesarederived.Forconvenienceinpracticalcomputation,analternating-directioniterativeschemeofthemixedfi-niteelementmethodisformulatedanditsstabilityandconverbenceareprovedforthelinearprob-lem.Anumericalexampleisprovidedattheendofthispaper.
简介:运用变分方法研究了下面问题-Δpu=μupx(s)s-2u+f(x,u),x∈Ω,u=0,x∈Ω,多重解的存在性,其中Ω是一个具有光滑边界的有界区域.
简介:一美国未来学家J·奈斯比特在《大趋势》一书中曾提出,三十年前(指1950年代)技术引入社会,有点强迫性,操作人员只好逆来顺受,没有拒绝接受的余地。三十年来(指1980年代)当某种技术引入社会时,人能自然地求取一种加以平衡的反应。作者把这种反应称之为高情感(hightouch),技术越高级,情感反应越强烈。他在书中提到电脑:随着学校中普遍使用电脑,许多学校恢复了宗教信仰活动,进行祈祷、静思等;随着最新的厨房技术等高技术进入家庭,软色调(即浅颜色)、舒适、饱满、未经加工似的外观、怀古、民间艺术(如手制的被单等)大受欢迎,装饰品和艺术品都强烈地表现出个性,