共查询到18条相似文献,搜索用时 165 毫秒
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研究了一类非线性蜕化方程。引入带权L^2空间,证明了方程初边值问题整体解的存在唯一性,并在无穷维空间证明了(E0,E)型整体吸引子的存在性。 相似文献
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该文研究具有非线性阻尼的非自治Navier-Stokes-Voigt方程的长时间动力学.首先,利用Galerkin方法证明了整体弱解的存在唯一性.然后,利用能量方法建立解过程的一致渐近紧性,从而证明了拉回吸引子的存在性.此外,还建立了固定有界集族上的吸引子与满足缓增条件的集族上的吸引子之间的关系. 相似文献
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本文讨论了一类带调和势|x|^2的非线性Schroedinger方程解的长时间行为,证明了整体吸引子的存在性. 相似文献
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本文研究具有惯性项和阻尼项的亚三次非线性Cahn-Hilliard方程的初边值问题.在非线性弱正则的条件下,我们建立弱解的适定性,而不考虑非线性项的一阶导数的下界条件.接着利用弱解的渐近紧和能量解的严格Lyapunov函数的存在性,证明在空间(H~2(?)∩H_0~1(?))×L~2(?)上存在整体吸引子. 相似文献
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该文研究了一类广义耦合的非线性波动方程组在无界区域上的 整体吸引子问题. 利用插值不等式和加权空间, 得到了一系列关于时间的一致先验估计,证 明了整体吸引子的存在性. 相似文献
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本文研究了一在应变波耦合组所生成的半群性质,通过算子解和构造进紧不变集,得到了该耦合组的紧的指数吸引子。 相似文献
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主要目的是利用Galerkin逼近法和先验估计来证明一类具有非线性阻尼和外源项的耗散型sine-Gordon-kirchhoff方程的整体吸引子的存在性,首先通过先验估计证明系统存在唯一的整体解,再证明系统存在有界吸收集和算子半群光滑性质,最后得到系统存在整体吸引子. 相似文献
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LetΩRn be a bounded domain with a smooth boundary.We consider the longtime dynamics of a class of damped wave equations with a nonlinear memory term utt+αut-△u-∫0t 0μ(t-s)|u(s)| βu(s)ds + g(u)=f.Based on a time-uniform priori estimate method,the existence of the compact global attractor is proved for this model in the phase space H10(Ω)×L2(Ω). 相似文献
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研究了一类非线性梁方程的渐近吸引子.即利用正交分解法构造一个有限维解序列.首先用数学归纳法证明了该解序列不会远离方程的整体吸引子,其次证明了它在长时间后无限趋于方程的整体吸引子,并给出了渐近吸引子的维数估计. 相似文献
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We apply the theory of multivalued semiflows to a nonlinear parabolic equation of the reaction–diffusion type in the case where it is impossible to prove the uniqueness of its solution. A multivalued semiflow is generated by solutions satisfying a certain estimate global in time. We establish the existence of a global compact attractor in the phase space for the multivalued semiflow generated by a nonlinear parabolic equation. We prove that this attractor is an upper-semicontinuous function of a parameter. 相似文献
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Global Topological Linearization with Unbounded Nonlinear Term 总被引:2,自引:0,他引:2
§ 1.Statementof Theorem Consider the systemx′=Ax + f (x) ,y′=By +φ(x) +ψ(y) ,(1 )where x∈ Rn1,y∈ Rn2 ,f,φ andψ are locally Lipschitzian.If x is in Rn we denote itsEnclidend norm by| x| and if A is an n×n matrix we denote its operator norm by| A| .Let Reλ(A) be the real partof eigenvalues of A. Suppose that Reλ(A) <0 and Reλ(B) >0 .Without loss of generality,we may assamethatd| x| 2dtx′=Ax≤ -α| x| 2 , (2 )| e- Bt|≤ k . e-βt (t≥ 0 ) , (3 )whereα,β and k are all… 相似文献
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Robert J. McCann 《偏微分方程通讯》2015,40(2):191-218
The thin film and quantum drift diffusion equations belong to a fourth-order family of evolution equations proposed in [21] to be analogous to the (second-order) porous medium family. They are 2-Wasserstein (=d 2) gradient flows of the generalized Fisher information I(v) just as the porous medium family was shown to be the d 2 gradient flow of the generalized entropy E(v) by Otto [41]. The identity aI(v) = bE(v) + |? d 2 E(v)|2/2 implies a Hess d 2 I(v *) = Hess d 2 E(v *)(b + Hess d 2 E(v *)) formally, when the equation is rescaled and linearized around the resulting self-similar critical profile v *. We couple this relation with the diagonalization of Hess d 2 E(v *) for the porous medium flow computed in [46]. This yields information about the leading- and higher-order asymptotics of the equation on R N which—outside of special cases—was inaccessible previously. 相似文献