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邊界退化的半線性拋物方程解的漸近行為

2023-04-29 00:00:00郭微靳曼莉井鑫鑫
吉林大學學報(理學版) 2023年4期

摘要: 用加權能量估計和構造自相似上解的方法, 研究一類在邊界退化的半線性拋物方程初邊值問題解的漸近行為, 得到了問題解的整體存在性和爆破性, 建立了Fujita型定理, 并刻畫了臨界Fujita指標與退化擴散項和非線性源項之間的定量關系.

關鍵詞: 邊界退化; 臨界Fujita指標; 半線性拋物方程

中圖分類號: O175.23 文獻標志碼: A 文章編號: 1671-5489(2023)04-0801-07

Asymptotic Behavior of Solutions to SemilinearParabolic Equations with" Boundary" Degeneracy

GUO Wei1, JIN Manli1, JING Xinxin2

(1. School of Mathematics and Statistics, Beihua University, Jilin 132013, Jilin Province, China;2. College of Mathematics and Systems Science, Shandong University of Science and Technology,Qingdao 266590, Shandong Province, China)

Abstract: We studied the asymptotic behavior of solutions for a class of" initial-boundary value problems of a semilinear parabolic equation with boundary degeneracy by using the methods of weighted energy estimates and constructing self-similar upper solutions. We obtained the global existence and blowing-up properties of solutions to the problem," established Fujita type theorem, and characterized the quantitative relationship between the critical Fujita exponent and the degenerate diffusion term and the nonlinear source term.

Keywords:" boundary degeneracy; critical Fujita exponent; semilinear parabolic equation

參考文獻

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(GUO W, GAO Y Z. Critical Fujita Curves for a Class of Nonlinear Coupled Convection-Diffusion Systems [J]. Journal of Jilin University (Science Edition), 2020, 58(2): 271-276.)

[7]JING X X, NIE Y Y, WANG C P. Asymptotic Behavior of Solutions to Coupled Semilinear Parabolic Systems with Boundary Degeneracy [J]. Electron J Differential Equations, 2021, 2021: 67-1-67-17.

[8]JING X X, NIE Y Y, WANG C P. Asymptotic Behavior of Solutions to Coupled Semilinear Parabolic Equations with General Degenerate Diffusion Coefficients [J]. Discrete Contin Dyn Syst Ser B, 2023, 28(2): 959-983.

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[13]ZHENG S N, WANG C P. Large Time Behaviour of Solutions to a Class of Quasilinear Parabolic Equations with Convection Terms [J]. Nonlinearity, 2008, 21(9): 2179-2200.

[14]ZHOU Q, NIE Y Y, HAN X Y. Large Time Behavior of Solutions to Semilinear Parabolic Equations with Gradient [J]. J Dyn Control Syst, 2016, 22(1): 191-205.

[15]周倩, 那楊, 高冬. 一類耦合半線性擴散方程組的Fujita臨界曲線 [J]. 吉林大學學報(理學版), 2020, 58(4): 733-743. (ZHOU Q, NA Y, GAO D. Fujita Critical Curves for a Class of Coupled Semilinear Diffusion Systems [J]. Journal of Jilin University (Science Edition), 2020, 58(4): 733-743.)

[16]ZHOU M J, LENG Y. Existence and Nonexistence of the Solutions to the Cauchy Problem of Quasilinear Parabolic Equation with a Gradient Term [J]. Lith Math J, 2021, 61(1): 123-142.

[17]ZHAO X T, ZHOU M J, JING X X. Asymptotic Behavior of Solutions to Porous Medium Equations with Boundary Degeneracy [J]. Electron J Differential Equations, 2021, 2021: 96-1-96-19.

(責任編輯: 趙立芹)

收稿日期: 2022-10-24.

第一作者簡介: 郭 微(1976—), 女, 漢族, 博士, 教授, 從事非線性擴散方程理論的研究, E-mail: guoweijilin@163.com. 通信作者簡介: 靳曼莉(1980—), 女, 漢族, 博士, 副教授, 從事微分方程定性理論的研究, E-mail: 64278144@qq.com.

基金項目: 吉林省教育廳科學技術研究項目(批準號: JJKH20210031KJ; JJKH20210029KJ).

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