共查询到20条相似文献,搜索用时 781 毫秒
1.
本文研究了带耗散项λuxx的Camassa-Holm方程的局部适定性和爆破现象.由Kato定理得到局部适定性的结果,证明了解的爆破机制,并且证明了当初值满足一定条件时解发生爆破,最后研究了爆破解的爆破率. 相似文献
2.
《数学物理学报(A辑)》2016,(5)
该文研究具有耗散梯度项的一类p-Laplace方程的爆破现象.借助于合适定义的辅助函数和由此产生的一阶微分不等式,分别给出了方程的解爆破与不爆破的条件.另外,当方程的解发生爆破时,还给出了爆破时间的下界估计. 相似文献
3.
主要研究了一类带Robin边界条件的拟线性抛物方程解的整体存在性与爆破问题,利用微分不等式技术,获得了方程的解发生爆破时的爆破时间的下界.然后给出了方程解整体存在的充分条件,最后得到了方程的解发生爆破时发生爆破时间的上界. 相似文献
4.
研究了具有依赖于时间的系数的非线性抛物方程解的爆破现象.对已知数据项进行一定的假设并设置一些辅助函数,应用微分不等式技术,得到了方程的解发生爆破的条件.当爆破发生时,分别推导了方程在二维区域和三维区域上解的爆破时间的下界. 相似文献
5.
《数学的实践与认识》2015,(16)
研究了非线性抛物方程具有齐次Neumann边界条件问题解的爆破.在对问题中的f,ρ和g作出适当的假设的前提下,推导出了上述问题解的爆破时间的下界.同时,也得到了问题的解不发生爆破的条件. 相似文献
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7.
本文研究了具有非线性非局部边界条件的一类退化型多孔介质方程.利用比较原理和上下解的方法,获得了方程的解是否在有限时刻爆破或整体存在的准则,这些结果表明,权重函数g(x,y)及指数l的大小对于问题解的爆破与否起着关键的作用.最后研究了爆破解的爆破率. 相似文献
8.
陈玉娟 《数学物理学报(A辑)》2010,30(2):386-396
该文采用弱上下解方法和正则化技巧,研究了一类非局部退化抛物型方程组解的爆破和整体存在性,给出了爆破指标,并对非退化情形m=n=1,p_1=q_1=0,p_2q_21给出了一致爆破速率. 相似文献
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10.
刘其林 《数学物理学报(A辑)》2006,26(3):440-448
该文研究了带有非局部源的扩散方程的爆破速率.关于这类方程,作者证得该类方程的解整体爆破且其爆破速率在区域的任一紧子区域内是一致的.在各种情形下,当t趋向于爆破时刻T*时,|u(t)|∞的爆破速率可精确确定. 相似文献
11.
This paper deals with blow-up solutions in parabolic equations coupled via nonlocal nonlinearities, subject to homogeneous Dirichlet conditions. Firstly, some criteria on non-simultaneous and simultaneous blow-up are given, including four kinds of phenomena: (i) the existence of non-simultaneous blow-up; (ii) the coexistence of non-simultaneous and simultaneous blow-up; (iii) any blow-up must be simultaneous; (iv) any blow-up must be non-simultaneous. Next, total versus single point blow-up are classified completely. Moreover, blow-up rates are obtained for both non-simultaneous and simultaneous blow-up solutions. 相似文献
12.
《数学物理学报(B辑英文版)》2020,(4)
In this article, we study the blow-up solutions for a case of b-family equations.Using the qualitative theory of differential equations and the bifurcation method of dynamical systems, we obtain five types of blow-up solutions: the hyperbolic blow-up solution, the fractional blow-up solution, the trigonometric blow-up solution, the first elliptic blow-up solution, and the second elliptic blow-up solution. Not only are the expressions of these blow-up solutions given, but also their relationships are discovered. In particular, it is found that two bounded solitary solutions are bifurcated from an elliptic blow-up solution. 相似文献
13.
In this paper, we investigate the blow-up behavior of solutions of a parabolic equation with localized reactions. We completely classify blow-up solutions into the total blow-up case and the single point blow-up case, and give the blow-up rates of solutions near the blow-up time which improve or extend previous results of several authors. Our proofs rely on the maximum principle, a variant of the eigenfunction method and an initial data construction method. 相似文献
14.
《应用数学年刊》2014,(4)
This paper deals with the blow-up properties of positive solutions to a localized degenerate and singular parabolic equation with weighted nonlocal boundary conditions. Under appropriate hypotheses, the global existence and finite time blow-up of positive solutions are obtained. Furthermore, the global blow-up behavior and the uniform blow-up profile of blow-up solutions are also described. We find that the blow-up set is the whole domain [0, a], including the boundaries, and this differs from parabolic equations with local sources case or with homogeneous Dirichlet boundary conditions case. 相似文献
15.
《Applied Mathematics Letters》2006,19(9):942-948
This paper deals with a reaction-diffusion equation with inner absorption and boundary flux of exponential forms. The blow-up rate is determined with the blow-up set, and the blow-up profile near the blow-up time is obtained by the Giga–Kohn method. It is observed that the blow-up rate and profile are independent of the nonlinear absorption term. 相似文献
16.
This paper deals with the blow-up properties of the positive solutions to a degenerate parabolic system with localized sources
and nonlocal boundary conditions. We investigate the influence of the reaction terms, the weight functions, local terms and
localized source on the blow-up properties. We will show that the weight functions play the substantial roles in determining
whether the solutions will blow-up or not, and obtain the blow-up conditions and its blow-up rate estimate. 相似文献
17.
Blow-UpandMassConcentrationofSolutionsto theCauchyProblemforNonlinearSchrodingerEquations秦玉明Blow-UpandMassConcentrationofSolu... 相似文献
18.
Bingchen Liu 《Applicable analysis》2013,92(10):1615-1627
This article deals with blow-up solutions in reaction–diffusion equations coupled via localized exponential sources, subject to null Dirichlet conditions. The optimal and complete classification is obtained for simultaneous and non-simultaneous blow-up solutions. Moreover, blow-up rates and blow-up sets are also discussed. It is interesting that, in some exponent regions, blow-up phenomena depend sensitively on the choosing of initial data, and the localized nonlinearities play important roles in the blow-up properties of solutions. 相似文献
19.
《Nonlinear Analysis: Theory, Methods & Applications》2005,61(7):1209-1224
This paper considers the Neumann problem for several types of systems with nonlocal nonlinear terms. We first give the blow-up conditions. And then, for the blow-up solution, we establish the precise blow-up estimates and show the blow-up set is the whole region. 相似文献
20.
This paper studies heat equations with inner absorptions and coupled boundary fluxes of mixed-type nonlinearities. At first, the critical exponent is obtained, and simply described via a characteristic algebraic system introduced by us. Then, as the main results of the paper, three blow-up rates are established under different dominations of nonlinearities for the one-dimensional case, and represented in another characteristic algebraic system. In particular, it is observed that unlike those in previous literature on parabolic models with absorptions, two of the multiple blow-up rates obtained here do depend on the absorption exponents. In the known works, the absorptions affect the blow-up criteria, the blow-up time, as well as the initial data required for the blow-up of solutions, all without changing the blow-up rates. To our knowledge, this is the first example of absorption-dependent blow-up rates, exploiting the significant interactions among diffusions, inner absorptions and nonlinear boundary fluxes in the coupled system. It is also proved that the blow-up of solutions in the model occurs on the boundary only. 相似文献