共查询到20条相似文献,搜索用时 560 毫秒
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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
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研究带有非线性边界条件的热方程组爆破解的爆破速率, 给出爆破速率的上、下界估计. 相似文献
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研究了具有非线性热源的半线性抛物型方程组的齐次neumann问题解的爆破性质.利用上下解方法得到了解整体存在的条件与爆破条件,并利用FriedmannMcleod方法建立了爆破速率估计. 相似文献
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该文研究一类带非局部源项的反应扩散方程组. 作者证明了初值充分大时解在有限时刻爆破, 建立了爆破解的爆破速率估计以及边界层估计. 相似文献
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考虑半空间上具耦合非线性边界条件的热方程组解的爆破估计. 给出了爆破速率的上界和下界估计, 得到了具零初值解的惟一性和非惟一性结果. 相似文献
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讨论了一类典型的半线性抛物型方程,其在物理上对应具有边界热源的热传导问题,证明了非平凡解发生爆破的充分条件,并讨论了爆破速率之上界与下界. 相似文献
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《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
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This paper studies the blow-up solution and its blow-up rate near the traveling waves of the second-order Camassa–Holm equation. The sufficient condition for the existence of blow-up solution is obtained by a rather ingenious method. Applying the extended pseudo-conformal transformation, an equivalent proposition of the solution breaking in finite time near the traveling waves is constructed. The relation is established between the blow-up time and rate of the solution and the residual’s. 相似文献
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Qilin Liu Yuxiang Li Hongjun Gao 《Journal of Mathematical Analysis and Applications》2006,320(2):771-778
In this short paper, we investigate blow-up rate of solutions of reaction–diffusion equations with localized reactions. We prove that the solutions have a global blow-up and the rate of blow-up is uniform in all compact subsets of the domain. 相似文献
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This paper deals with blow-up properties for a degenerate parabolic system with nonlinear localized sources subject to the homogeneous Dirichlet boundary conditions. The main aim of this paper is to study the blow-up rate estimate and the uniform blow-up profile of the blow-up solution. Our conclusions extend the results of [L.L. Du, Blow-up for a degenerate reaction-diffusion system with nonlinear localized sources, J. Math. Anal. Appl. 324 (2006) 304-320]. At the end, the blow-up set and blow up rate with respect to the radial variable is considered when the domain Ω is a ball. 相似文献
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Blow-up for a semilinear reaction-diffusion system coupled in both equations and boundary conditions
Sheng-Chen FuJong-Shenq Guo 《Journal of Mathematical Analysis and Applications》2002,276(1):458-475
We study the blow-up behavior for a semilinear reaction-diffusion system coupled in both equations and boundary conditions. The main purpose is to understand how the reaction terms and the absorption terms affect the blow-up properties. We obtain a necessary and sufficient condition for blow-up, derive the upper bound and lower bound for the blow-up rate, and find the blow-up set under certain assumptions. 相似文献
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This article studies the blow-up properties of solutions to a porous medium equation with nonlocal boundary condition and a general localized source. Conditions for the existence of global or blow-up solutions are obtained. Moreover, it is proved that the unique solution has global blow-up property whenever blow-up occurs. Blow-up rate estimates are also obtained for some special cases. 相似文献
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Growth estimate of positive solution for a quasilinear parabolic equation subject to Robin boundary condition is presented by the maximum principles. The growth estimate is then used to study blow-up of the solution of the problem. The bounds of ‘blow-up time’ and blow-up rate are obtained. 相似文献
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Blow-up rate for a nonlinear diffusion equation 总被引:1,自引:0,他引:1
In this work we study the blow-up rate for a nonlinear diffusion equation with an inner source and a nonlinear boundary flux, which is equivalent to a porous medium equation with convection. Depending upon the sign of a parameter included, the source can be positive or negative (absorption). By the scaling method, we obtain that the blow-up rate is independent of a negative source, while for the situation with a positive source, the blow-up rate is determined by the interaction between the inner source and the boundary flux. Comparing with the previous results for the porous medium model without convection, we observe that the gradient term included here does not affect the blow-up rates of solutions. 相似文献
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In this paper, the blow-up rate of solutions of semi-linear reaction-diffusion equations with a more complicated source term, which is a product of nonlocal (or localized) source and weight function a(x), is investigated. It is proved that the solutions have global blow-up, and that the rates of blow-up are uniform in all compact subsets of the domain. Furthermore, the blow-up rate of ∞|u(t)| is precisely determined. 相似文献