简介:Theinitialvalueproblemsandthefirstboundaryproblemsforthequasilinearwaveequationutt-[a0+na1(ux)n-1]uxx-a2uxxtt=0areconsidered,wherea0,a2>0areconstants,a1isanarbitraryrealnumber,nisanaturalnumber.Theexistenceanduniquenessoftheclassicalsolutionsfortheinitialvalueproblemsandthefirstboundaryproblemsoftheequation(1)areprovedbytheGalerkinmethod.
简介:THEPATHWISESOLUTIONFORACLASSOFQUASILINEARSTOCHASTICDIFFERENTIALEQUATIONINBANACHSPACESIHuYaozhong(胡耀忠)(WuhanInst.ofMath.Sci.,C...
简介:Thequasilinearhyperbolicequationwithnonlineardampingisconsideredinthispaper,anewasymptoticprofileforthesolutiontotheequationisobtainedbysuitablychoosingtheinitialdataofthecorrespondingparabolicequation,theconvergenceratesofthenewprofilearebetterthanthatobtainedbyNishihara(1997,J.DifferentialEquations137,384-395)andH.-J.Zhao(2000,J.DifferentialEquations167,467-494).
简介:TheexistenceandmultiplicityofpositivesolutionsarestudiedforaclassofquasilinearellipticequationsinvolvingSobolevcriticalexponentswithmixedDirichlet-Neumannboundaryconditionsbythevariationalmethodsandsomeanalyticaltechniques.
简介:Forfirst-orderquasilinearhyperbolicsystemswithzeroeigenvalues,theauthorestablishesthelocalexactcontrollabilityinashortertime-periodbymeansofinternalcontrolsactingonsuitabledomains.Inparticular,undercertainspecialbutreasonablehypotheses,thelocalexactcontrollabilitycanberealizedonlybyinternalcontrols,andthecontroltimecanbearbitrarilysmall.
简介:Theauthorconsidersthelife-spanofclassicalsolutionstoCauchyproblemforgeneralfirstorderquasilinearstrictlyhyperbolicsystemsintwoindependentvariableswith"slow"decayinitialdata.Byconstructinganexample,firstitisillustratedthattheclassicalsolutiontothiskindofCauchyproblemmayblowupinafinitetime,evenifthesystemisweaklylinearlydegenerate.Thensomelowerboundsofthelife-spanofclassicalsolutionsaregiveninthecasethatthesystemisweaklylinearlydegenerate.Theseestimatesimplythat,whenthesystemisweaklylinearlydegenerate,theclassicalsolutionexistsalmostgloballyintime.Finally,itisprovedthatTheorems1.1-1.3in[2]arestillvalidforthiskindofinitialdata.
简介:为quasilinear波浪方程的答案的计算介绍第一和第二顺序精确性的有限差别方法的一个班。一般symplectic计划的概述并且产生功能;为quasilinear的数字计划挥动方程;数字结果。
简介:在内部消散的条件下面,为不同类的quasilinear的Cauchy问题有小起始的数据的夸张系统承认唯一的全球C1个答案,指数地作为t+腐烂到零,当时如果边界条件的系数矩阵满足边界消散的状况,有为有至少秒的非线性的条款的夸张系统订的quasilinear的小起始的数据的混合的起始边界的值问题承认唯一的g在这份报纸,在更一般的条件下面,作者调查内部消散的条件和边界的联合效果消散的状况,并且证明全球存在和C的指数的腐烂为quasilinear的混合的起始边界的值问题的1个答案有小起始的数据的夸张系统。这稳定性结果被用于一种模型,并且一个例子被给看可能的指数的不稳定性相应条件是否没满足。