四阶椭圆方程基态解的集中性态

该文分析了四阶椭圆方程△^２u=|x|^au^p-1,x∈Ω; u=\Delta u=0 , x ∈аΩ, (Ω表示Rⁿ中以原点为中心的球)基态解的集中性态,并证明了当p趋近于 2^*=\frac{2n}{n-4} (n>4)时基态解u_p集中在Ω的边界附近.     

非线性Schrdinger方程基态解的一致集中

本文讨论一类非线性Schrdinger方程-ε~2△v+V(z)v=K(x)v~p,x∈R~N,v∈W~(1,2)(R~N),v(x)>0,势函数V(x)有正下界和在无穷远处为零两种情形.通过强最大值原理我们证明方程的基态解关于充分小的ε>0一致集中.     

一类具有临界指数的对数Schr?dinger方程基态解的存在性和集中性

本文研究一类具有竞争位势和临界指数的对数Schr?dinger方程,它的能量泛函在其自然Sobolev空间中没有一阶连续导数.首先利用非光滑临界点理论,获得相关的自治对数Schr?dinger方程基态解的存在性;然后,通过引入一个合适的基态能量函数,利用Nehari流形方法研究位势函数与对数Schr?dinger方程基态解存在性和集中性的关系;最后,给出此类方程基态解不存在的一个充分条件.     

一类修正Gross-Pitaevskii方程基态解的存在性

该文利用伸缩变换结合重排不等式等技巧得到了修正Gross-Pitaevskii方程对应极小化问题极小元的存在性与非线性项指数p的依赖关系.当2

0,极小化问题存在极小元.若p=2+4/N且c≤‖φ‖₂或者c>(3/2)^N/4‖φ‖₂(‖φ‖₂的定义见第一节)或p> 2+4/N,问题不存在极小解.而对于p=2+4/N且‖φ‖₂ N/4‖φ‖₂,不知道是否存在极小解.     

R2中非局部椭圆型方程基态解的存在性

本文考虑了一类非局部椭圆型方程-△u+V(x)u=(1/|x|μ*Q(x)F(u)/|x|β)Q(x)f(u)|x|β,x∈R^x,其中V是正的连续位势函数,0<μ<2,0≤β<1/2,2β+μ≤2,F(s)是f(s)的原函数.假设非线性项f(s)满足Trudinger-Moser型次临界指数增长,利用变分方法证明了该方程基态解的存在性.     

具有周期外力场Dirac方程的基态解

本文研究非线性Dirac方程-i∑_k=1³α_k?_ku+aβu+M(x)u=g(x,|u|)u基态解的存在性,其中位势函数M(x)是周期的.当非线性项g在无穷远处分别满足超二次与局部超二次增长条件时,利用非Nehari流形方法,在非线性项没有严格单调条件的情形下,证明Nehari-Pankov型基态解的存在性.主要克服了两个困难:(1)相关能量泛函是强不定的,即工作空间分解成的正负子空间的维数都是无穷大,这导致经典的临界点定理不能直接应用;(2)当非线性项不是全局超二次时,验证Cerami序列的环绕结构并证明其有界性.     

一类周期非线性差分方程的基态解

本文研究了一类二阶周期非线性差分方程基态解的存在性问题.利用临界点理论结合Nehari流形方法,获得了此类方程基态解的存在性.在比经典AR条件更一般的超二次条件下,本文结论推广了已有的结果,并举例说明此类方程解的存在性.     

具外部位势分数阶Choquard方程的基态解

研究具外部位势非自治分数阶Choquard方程:{(-?)~su+mu+V(x)u=(1+a(x))(I_α*|u|p)|u|~(p-2)u,x∈R~N u(x)→0,当|x|→∞时,基态解的存在性.利用Nehari流形技巧、集中紧性原理和山路引理得到了基态解的存在性.     

非线性薛定谔-麦克斯韦方程基态解的存在性

对V,K和f作出一些假设,用山路定理得出如下的薛定谔-麦克斯韦方程基态解:{-Δu+V(x)u+K(x)φu=f(x,u), in R~3,-Δφ=K(x)u~2,in R~3.(*)     

ON GROUND STATE SOLUTIONS FOR SUPERLINEAR DIRAC EQUATION

This article is concerned with the nonlinear Dirac equations-iatψ = ich3Σk=1αkakψ- mc2βψ + Rψ(x, ψ) in R3.Under suitable assumptions on the nonlinearity, we establish the existence of ground state solutions by the generalized Nehari manifold method developed recently by Szulkin and Weth.     

计算立方体上Henon方程多个正解的分歧方法

本文首先应用分歧方法给出计算立方体上Henon方程边值问题D₄(3)对称正解的三种算法, 然后以Henon方程中的参数r为分歧参数, 在D₄(3)对称正解解枝上 用扩张系统方法求出对称破缺分歧点, 进而用解枝转接方法计算出其它具有不同对称性质的正解.     

EXISTENCE AND ASYMPTOTIC BEHAVIOR OF THE SOLUTIONS FOR A NONLINEAR ELLIPTIC EQUATION ARISING IN ASTROPHYSICS

The author first analyzes the existence of ground state solutions and cylindrically symmetric solutions and then the asymptotic behavior of the ground state solution of the equation -△u=φ(r)up-1,u>0 in RN, u ∈ D1,2(RN),where N≥ 3,x = (x',z)∈ RK×RN-K,2≤K≤N,r =|x'|.It is proved that for 2(N -s)/(N-2) < p < 2* = 2N/(N -2),0 < s < 2, the above equation has a ground state solution and a cylindrically symmetric solution. For p=2*, the above equation does not have a ground state solution but a cylindrically symmetric-solution, and when p close to 2*, the ground state solutions are not cylindrically symmetric. On the other hand, it is proved that as p close to 2*, the ground state solution up has a unique maximum point xp = (x'p,zp) and as p→2*, |x'p|→r0 which attains the maximum of φ on RN.The asymptotic behavior of ground state solution up is also given, which also deduces that the ground state solution is not cylindrically symmetric as p goes to 2*.     

EXISTENCE OF FAST-DECAY GROUND STATE OF P-LAPLACIAN EQUATION

Using the shooting argument and an approximating method, this paper is concerned with the existence of fast-decay ground state of p-Laplacian equation: Δ_pu + f(u) = 0, in Rⁿ, where f(u) behaves just like f(u) = u^q – u^s, as s > q >np/(n – p) – 1.     

ON THE RADIAL GROUND STATE OFP-LAPLACIAN EQUATION WITH GRADIENT TERM PERTURBATION

1IntroductionInthispaper,weconsidertheexistence,uniqueuessandnonexistenceoftheradialgroundstatetothefollowingp-Laplacianequation:whereApu=div(IDttl)Du),n>p22,qissubcriticalexponents,i.e.,qo.Bydefinition,afunctionu(x)issaidtobetheradialgroundstateto(1.1),ifu(x)=u(r)satisfies:1)u(r),Iu'Ip-'U'eC'([o, oo));2)u(r)isthesolutionofthefollowingCauchyproblem:3)u(r)satisfiesIn0urf0rmerpaper[1],westlldiedtheexistenceanduniqueness0fradialgroundstatetoproblem(1-1)inthecasewhereq…     

R3中一类Kirchhoff型方程变号解的存在性及集中性

本文研究了一类Kirchhoff型方程。利用极大极小原理及惩罚函数方法,证明了上述方程变号解的存在性及集中性,我们的结果推广了文献[4]的结果。     

热传导方程解在边界附近的渐近行为

考虑热传导方程的初边值问题的解。当初值与边值“不相容”时。由于热传导方程的特性这个解可以在很短时间内变得光滑。并形成一个边界层，本文将通过上、下解的控制给出解在边界附近变化的渐进行为．     

ASYMPTOTIC BEHAVIOR OF POSITIVE RADIAL SOLUTIONS FOR THE GENERALIZED EMDEN-FOWLER EQUATION WITH APPLICATION

In this paper, we consider a class of semilinear parabolic differential equation where nonlinear term has local bounded coefficients. Under some assumptions, we get the existence and uniqueness of solution. Terminate to the time variable, we obtain the so called generalized Emden-Fowler equation and the asymptotic behavior of positive radial solutions have been given in all dimensions. At the end of this paper, we give its application to critical branching Brownian motion (also called measure-valued branching processes).     

ASYMPTOTIC BEHAVIOR AND EXISTENCE OF POSITIVE SOLUTIONS FOR A NEUTRAL DIFFERENCE EQUATION

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