Project/Area Number  09640276 
Research Category 
GrantinAid for Scientific Research (C)

Section  一般 
Research Field 
General mathematics (including Probability theory/Statistical mathematics)

Research Institution  The University of Tokushima 
Principal Investigator 
ITO Masayuki The Univ.of Tokushima, Dept.of Math.& Natural Sc., Associate P., 総合科学部, 助教授 (70136034)

CoInvestigator(Kenkyūbuntansha) 
KODA Atsuhito The Univ.of Tokushima, Fac.of Technology, Associate p., 工学部, 助教授 (50116810)
小野 公輔 徳島大学, 総合科学部, 講師 (00263806)
YAMADA Yoshio Waseda Univ.Dept.of Mathematics, Professor, 理工学部, 教授 (20111825)
FUKAGAI Yoshinobu The Univ.of Tokushima, Fac.of Technology, Assosiaite P., 工学部, 助教授 (90175563)
NARUKAWA Kimiaki Naruto Edu.Univ., Fac.of School Ed., Professor, 学校教育学部, 教授 (60116639)
MURAKAMI Koichi The Univ.of Tokushima, Dept.of Math.& Natural Sc., Lecturer, 総合科学部, 講師 (90219890)

Project Fiscal Year 
1997 – 1998

Project Status 
Completed(Fiscal Year 1998)

Budget Amount *help 
¥3,100,000 (Direct Cost : ¥3,100,000)
Fiscal Year 1998 : ¥1,000,000 (Direct Cost : ¥1,000,000)
Fiscal Year 1997 : ¥2,100,000 (Direct Cost : ¥2,100,000)

Keywords  pLaplacian / *Laplacian / limit eigenvalue problem / Poincare inequality / degenerate elliptic equation / reactiondiffusion equations / delay differential equation / blow up / pラプラシアン / ∞ラプラシアン / 極限固有値問題 / ポアンカレ不等式 / 退化楕円型方程式 / 反応拡散方程式 / 時間遅れ方程式 / 爆発 / 非線形偏微分方程式 / 退化楕円型作用素 / 非線形拡散 / キルヒホッフ / 非線形波動方程式 / 非線形振動 
Research Abstract 
1) The pLaplace operators is well known as the nonlinear modification of the usual Laplacian. These operators or their perturbed operators arise in the model equations for the elastic membrane, nonlinear diffusion phenomena and so on. Moreover, the limit state of solutions at p infinity is of great interest from the mathematical or technological view points. The eigenvalue problem of pLaplacian has been studied by many authors. Since this problem can be dealt with as a variational problem, many results has been known. However, its limit problem at p infinity had been known because it cannot be described in a variatinal problem. We formulate such problem using the notion of the viscosity solution and obtain some results for the limit eigenvalues and the associate eigenfunctions. 2) In the ecological model, a reactiondiffusion equation has the nonlinear diffusion with the pLaplace operator when the diffusion depends on the population pressure nonlinearly. Yamada has studied such equation and obtain the unique and global existence of a solution and sonic results on the set of stationary solutions. He also study the 3 species cooperative competitiondiffusion systems with linear diffusion, and obtain the necessary and sufficient condition to the existence of the coexistence solutions. 3) Murakami has studied the asymptotic behavior of the solution for several higher dimensional delay differential equations and obtain the existence of periodic solutions which are bifurcated from the equilibrium, in particular, the explicit expressions of the bifurcated periodic solutions. 4) Kohda has obtained some conditions on initial value for parabolic problem which guarantee the blowup of a solution. Moreover, he had shown the behavior of blowup solution near blowup time, that is blowup patterns. 4. 放物型方程式の解の爆発について初期値に対する新しい十分条件をまず考えた。そしてこの条件の下で爆発時刻付近での解の挙動に関する結果も得た(香田)。
