System of nonlocal nonlinear differential equations and applications
Project/Area Number 
13640174

Research Category 
GrantinAid for Scientific Research (C)

Allocation Type  Singleyear Grants 
Section  一般 
Research Field 
Basic analysis

Research Institution  Shimane University 
Principal Investigator 
KATO Nobuyuki Shimane University, Dept. Math., Associate Professor, 総合理工学部, 助教授 (40177423)

CoInvestigator(Kenkyūbuntansha) 
AIKAWA Hiroaki Shimane University, Dept. Math., Professor, 総合理工学部, 教授 (20137889)
FURUMOCHI Tetsuo Shimane University, Dept. Math., Professor, 総合理工学部, 教授 (40039128)
YAMASAKI Maretsugu Shimane University, Dept. Math., Professor, 総合理工学部, 教授 (70032935)
SUGIE Jitsuro Shimane University, Dept. Math., Professor, 総合理工学部, 教授 (40196720)

Project Period (FY) 
2001 – 2002

Project Status 
Completed (Fiscal Year 2002)

Budget Amount *help 
¥3,000,000 (Direct Cost: ¥3,000,000)
Fiscal Year 2002: ¥1,300,000 (Direct Cost: ¥1,300,000)
Fiscal Year 2001: ¥1,700,000 (Direct Cost: ¥1,700,000)

Keywords  Nonlocal nonlinear / Population models / Sizedependent / Transport equations / Muscle contraction / 非局所条件 / 発展方程式 / 個体数変動 / 筋収縮 / 固体数変動 / 漸近挙動 / 定常解 
Research Abstract 
First, we have investigated the population models with growth rate depending on size and time. Continuous dependence of solution on all given data is obtained. For the dependency on initial values, aging functions and birth functions, it is shown relatively simply, but the dependency on growth rate includes an essentially difficult problem. The way of solving equation is socalled the characteristic method and the characteristic curves are determined by the growth rate, and so when the growth rate is perturbed, the characteristic curves themselves change. The results here are important as the stability of equation, and at the same time, they can be used to investigate the models with nonlinear growth rate. Next, we have investigated the sizedependent population models with growth rate depending on size and the total population. Originally, the models come from describing the population dynamics of plants in forests or plantations. We obtained the existence and uniqueness results for more general models and we gave a presentation about this result at the international conference held at Hong Kong in 2002. Muscle contraction is a consequence of relative sliding between tha thick filament called myosin and the thin filament called actin. This sliding occurs when the socalled crossbridges attach myosin to actin and act as spring. The muscle contraction models describe the temporal variation of the density of the attached crossbridges. In this research, we have considered a system of hyperbolic transport equations. Our model contains the socalled four state models in which there are two state of attached and detached crossbridges respectively.

Report
(3 results)
Research Products
(5 results)