简介:Byasingthenonclassicalmethodofsymmetryreductions,theexactsolutionsforgeneralvariable-coefficientKdVequationwithdissipativelossandnonuniformitytermsareobtained.Whenthedissipativelossandnonuniformitytermsdon'texist,themultisolitonsolutionsarefoundandthecorrespondingPainleveIItypeequationforthevariable-coefficientKdVequationisgiven.
简介:讨论一类非线性分数阶微分方程耦合系统的Robin边值问题,应用Schauder不动点定理证明正解的存在性,然后利用Adomian分解方法求出该边值问题的近似解.另外,给出一个数值例子来说明我们主要结果的应用.
简介:TheBacklundtransformation(BT)forafifthorderKdVequationispresentedinthebilinearform.Furthermore,anonlinearsuperpositionformularelatedtotheBTobtainedaboveisprovedrigorously.Bytheway,anonlinearsuperpositionformulaofamodifiedfifthorderKdVequationisalsogiven.
简介:Inthispaper,westudytheorbitalstabilityofsolitarywavesofcompoundKdV-typeequationintheformofut+aupux+bu2pux+uxxx=0(b≥0,p>0).Ourresultsimplythatorbitalstabilityofsolitarywavesisaffectednotonlybythehighest-ordernonlineartermbu2pupx,butalsothenonlineartermauux.Forthecaseofb>0and0
0,whilethatunstablewhena<0.Thestabilityfornegativesolitarywaveu2(x-ct)isonthecontrary.Inparticular,wepointthatthenonlineartermwithcoefficientamakescontributestothestabilityofthesolitarywaveswhenp=2anda>0.
简介:Anewdiscreteisospectralproblemisintroduced,fromwhichthecoupleddiscreteKdVhierarchyisdeducedandiswritteninitsHamiltonianformbymeansofthetraceidentity.ItisshownthateachequationintheresultinghierarchyisLiouvilleintegrable.Furthermore,aninfinitenumberofconservationlawsareshownexplicitlybydirectcomputation.
简介:Weinvestigateanewclassofperiodicsolutionsto(2+1)-dimensionalKdVequations,byboththelinearsuperpositionapproachandthemappingdeformationmethod.Thesenewperiodicsolutionsaresuitablecombinationsoftheperiodicsolutionstothe(2+1)-dimensionalKdVequationsobtainedbymeansoftheJacobianellipticfunctionmethod,buttheypossessdifferentperiodsandvelocities.
简介:UsingthestandardPainlevéanalysisandtheperturbativemethod,thePainlevétestforthelogarithmicbranchisinvestigated.NinearbitraryfunctionsareobtainedandtheBacklundtransformationofthelogarithmicbranchisgiven.UsingthenewtypeBacklundtransformation,manyexactsolutionsareobtained.
简介:提高紧耦合天线的隔离度是雷达、通信和电子对抗等许多领域中提升系统性能的技术之一,目前的方法大多以牺牲天线辐射效率为代价。研究了一种基于反相耦合相消理念的去耦方法,可以在极小间距情况下实现天线单元之间的高隔离度,并且保持较高的天线增益。利用一种微带双天线结构来验证这一方法,这种结构的两个天线都工作于1.8GHz,相互间的间隔为10mm(1/16波长),仿真和实验结果说明,两个天线间的隔离可以低于-20dB。经仿真结果显示该结构中的天线增益要大于0dB,与不经隔离设计时的同结构同尺寸天线差别约1dB。初步实现了在较小地影响辐射性能的前提下实现紧耦合天线之间的高隔离目标。
简介:与联系的谎言点对称新(2+1)维的KdVequationu_t+3u_xu_y+u_(xxy)=0被调查。一些类似减小被解决相应特战程导出。为这个方程的Painleve分析也被介绍,孤立子答案从Baecklund转变直接被获得。
简介:AgroupofasymmetricdifferenceschemestoapproachtheKorteweg-deVries(KdV)equationisgivenhere.Accordingtosuchschemes,thefullexplicitdifferenceschemeandthefunimplicitone,analternatingsegmentexplicit-implicitdifferenceschemeforsolvingtheKdVequationisconstructed.Theschemeislinearunconditionallystablebytheanalysisoflinearizationprocedure,andisuseddirectlyontheparallelcomputer.Thenumericalexperimentsshowthatthemethodhashighaccuracy.