| Author | Watanabe, Masaji| Kawai, Fusako| |
|---|---|
| Published Date | 2004-11 |
| Publication Title | 環境制御 |
| Volume | volume26 |
| Content Type | Departmental Bulletin Paper |
| Author | Watanabe, Masaji| Kawai, Fusako| |
|---|---|
| Published Date | 2003-08 |
| Publication Title | 環境制御 |
| Volume | volume25 |
| Content Type | Departmental Bulletin Paper |
| JaLCDOI | 10.18926/fest/11457 |
|---|---|
| Title Alternative | Study on Effects of the Density Current Generator by Experiment and Measurement |
| FullText URL | 009_059_064.pdf |
| Author | Watanabe, Masaji| Yamatogi, Toshio| |
| Abstract | The density current generator (Manufacturer: Nakashima Propeller Co., Ltd., Patent owner: Hitachi Metals, Ltd.) is designed to generate vertical circulation over a wide water area harnessing the density current effect. We present some experimental results that we obtained using a float equipped with a GPS unit to study water flows generated by a density current generator unit set in S-Reservoir in Okayama Prefecture. We also present some measured results concerning the water temperature around the unit. We discuss its effects observing the experimental results and the measured results. |
| Keywords | density current stratification water environment |
| Publication Title | 岡山大学環境理工学部研究報告 |
| Published Date | 2004-02-27 |
| Volume | volume9 |
| Issue | issue1 |
| Start Page | 59 |
| End Page | 64 |
| ISSN | 1341-9099 |
| language | Japanese |
| File Version | publisher |
| NAID | 120002313754 |
| JaLCDOI | 10.18926/fest/11613 |
|---|---|
| FullText URL | 001_055_064.pdf |
| Author | Watanabe, Masaji| |
| Abstract | We analyze some mathematical problems that arise in studies of phenomena observed in the cardiac action. We illustrate a method to characterize the response of a nonlinear oscillator to an external forcing, and introduce some numerical results. We also introduce some results of numerical computation in an example of a coupled system of an excitable system and a nonlinear oscillator. |
| Keywords | periodic forcing nonlinear oscillators excitable systems couples systems. |
| Publication Title | 岡山大学環境理工学部研究報告 |
| Published Date | 1996-03 |
| Volume | volume1 |
| Issue | issue1 |
| Start Page | 55 |
| End Page | 64 |
| ISSN | 1341-9099 |
| language | English |
| File Version | publisher |
| NAID | 120002313699 |
| JaLCDOI | 10.18926/fest/11596 |
|---|---|
| FullText URL | 002_019_024.pdf |
| Author | Watanabe, Masaji| |
| Abstract | We study a system obtained by coupling a nonlinear oscillator and a stationary system. We analyze the dynamics in a singular limit and show that asymptotically orbitally stable periodic solutions can exist. We also show how a slow oscillation can arise in the coupled system. |
| Publication Title | 岡山大学環境理工学部研究報告 |
| Published Date | 1997-01-10 |
| Volume | volume2 |
| Issue | issue1 |
| Start Page | 19 |
| End Page | 24 |
| ISSN | 1341-9099 |
| language | English |
| File Version | publisher |
| NAID | 120002313835 |
| Author | Wardhani, Puteri Kusuma| Watanabe, Masaji| |
|---|---|
| Published Date | 2016 |
| Publication Title | AIP Conference Proceedings |
| Volume | volume1707 |
| Content Type | Conference Paper |
| JaLCDOI | 10.18926/fest/11421 |
|---|---|
| FullText URL | 012_001_006.pdf |
| Author | Watanabe, Masaji| Kawai, Fusako| |
| Abstract | A mathematical model for exogenous depolymerization with time dependent degradation rate is analyzed in order to study the biodegradation of polyethylene glycol. The weight distribution with respect to the molecular weight before and after cultivation of microorganisms were analyzed an inverse problem to determine the time dependent degradation rate. Numerical techniques to solve the inverse problem and to simulate the transition of the weight distribution are described. |
| Keywords | biodegradation polyethylene glycol mathematical model numerical simulation |
| Publication Title | 岡山大学環境理工学部研究報告 |
| Published Date | 2007-03-15 |
| Volume | volume12 |
| Issue | issue1 |
| Start Page | 1 |
| End Page | 6 |
| ISSN | 1341-9099 |
| language | English |
| File Version | publisher |
| NAID | 120002313599 |
| JaLCDOI | 10.18926/fest/11452 |
|---|---|
| FullText URL | 011_015_018.pdf |
| Author | Watanabe, Masaji| Liu Ying| Wang Ming Jun| |
| Abstract | Numerical techniques to simulate tsunamis are described. Partial differential equations are reduced to a system of ordinary differential equations to which appropriate numerical solvers can be applied. The techniques are illustrated with an example in which tsunami due to an earthquake is simulated. |
| Keywords | tsunami finite elements numerical simulation |
| Publication Title | 岡山大学環境理工学部研究報告 |
| Published Date | 2006-03-15 |
| Volume | volume11 |
| Issue | issue1 |
| Start Page | 15 |
| End Page | 18 |
| ISSN | 1341-9099 |
| language | English |
| File Version | publisher |
| NAID | 120002314045 |
| JaLCDOI | 10.18926/fest/12828 |
|---|---|
| FullText URL | 13_057_062.pdf |
| Author | Liu Ying| Sumida, Shinya| Ceric Majda| Yamamoto, Kazuhiro| Watanabe, Masaji| |
| Abstract | Numerical techniques to simulate tsunami waves are described, and numerical results are introduced. A finite difference method is applied to shallow water equations to analize the propagation of tsunami wave. Numerical results to simulate a tsunami wave generated on the Nankai Trough are introduced. |
| Keywords | tsunami finite difference staggered grid leapfrog |
| Publication Title | 岡山大学環境理工学部研究報告 |
| Published Date | 2008-03 |
| Volume | volume13 |
| Issue | issue1 |
| Start Page | 57 |
| End Page | 62 |
| ISSN | 1341-9099 |
| language | English |
| File Version | publisher |
| NAID | 120002304776 |
| Author | Putri, Arrival Rince| Nova, Tertia Delia| Watanabe, Masaji| |
|---|---|
| Published Date | 2016 |
| Publication Title | AIP Conference Proceedings |
| Volume | volume1707 |
| Content Type | Conference Paper |
| JaLCDOI | 10.18926/fest/11456 |
|---|---|
| FullText URL | 009_053_058.pdf |
| Author | Numaguchi Satoshi| Med Mahmoud Ould Med Lemine| Watanabe, Masaji| |
| Abstract | We study a wind-generated current in Kojima Lake. We introduce an experimantal result which was obtained using a float equipped with a GPS unit. We also present a result of numerical study in which a result from finite element analysis of flow is applied to the momentum equation of the float to simulate its motion. |
| Keywords | water environment global positioning system numerical simulation |
| Publication Title | 岡山大学環境理工学部研究報告 |
| Published Date | 2004-02-27 |
| Volume | volume9 |
| Issue | issue1 |
| Start Page | 53 |
| End Page | 58 |
| ISSN | 1341-9099 |
| language | English |
| File Version | publisher |
| NAID | 120002313924 |
| JaLCDOI | 10.18926/fest/11610 |
|---|---|
| FullText URL | 001_047_053.pdf |
| Author | Sasaki, Toru| Ishikawa, Hirofumi| Kajiwara, Tsuyoshi| Watanabe, Masaji| |
| Abstract | We treat the problem of water pollution by the method of a mathematical model. We illustrate the method of analysis with Kojima Lake. We analyze in-flow and out-flow of the lake, compute numerical solutions of the governing equations of the water flow and the pollutant. The simulation leads to the conclusion concerning the figure of Kojima Lake. |
| Keywords | Kojima lake Water analysis Finite element method |
| Publication Title | 岡山大学環境理工学部研究報告 |
| Published Date | 1996-03 |
| Volume | volume1 |
| Issue | issue1 |
| Start Page | 47 |
| End Page | 53 |
| ISSN | 1341-9099 |
| language | English |
| File Version | publisher |
| NAID | 120002313787 |
| JaLCDOI | 10.18926/fest/11484 |
|---|---|
| FullText URL | 010_023_028.pdf |
| Author | Watanabe, Masaji| Liu Ying| Wang Ming Jun| |
| Abstract | Topographical data of Kojima Lake have been updated by applying data obtained after dredging. Together with tide level of Kojima Bay and water levels of Kurashiki River and Sasagase river, the information was incorporated in computational analysis of unsteady flows generated in the lake when the water was discharged from Kojima Lake to Kojima, Bay. A finite element method was applied to equations governing unsteady flows, and the transition of discharge was obtained. |
| Keywords | water environment finite element method numerical simulation |
| Publication Title | 岡山大学環境理工学部研究報告 |
| Published Date | 2005-02-28 |
| Volume | volume10 |
| Issue | issue1 |
| Start Page | 23 |
| End Page | 28 |
| ISSN | 1341-9099 |
| language | English |
| File Version | publisher |
| NAID | 120002313649 |
| JaLCDOI | 10.18926/fest/19695 |
|---|---|
| FullText URL | 004_001_006.pdf |
| Author | Watanabe, Masaji| |
| Abstract | According ot previous studies, we may expect that slow oscillations can occur in dynamics of a parameterized family of systems in which a biochemical oscillator is coupled to a stationary systems. We introduce some numerical results that confirm our expectation. The results suggest that it is possible for slow oscillations to occur in dynamics of a system in which an active oscillatory unit is coupled to a passive medium, and that it is possible for circadian oscillations to arise from fast glycolytic oscillations in such a coupled system. |
| Keywords | circadian rhythm glycolytic oscillation nonlinear oscillator |
| Publication Title | 岡山大学環境理工学部研究報告 |
| Published Date | 1999-02-26 |
| Volume | volume4 |
| Issue | issue1 |
| Start Page | 1 |
| End Page | 6 |
| ISSN | 1341-9099 |
| language | English |
| File Version | publisher |
| NAID | 120002309099 |
| JaLCDOI | 10.18926/fest/11497 |
|---|---|
| FullText URL | 008_023_026.pdf |
| Author | Watanabe, Masaji| Numaguchi Satoshi| |
| Abstract | The global positioning system (GPS) is utilized for analysis of flows in the water environment. A float equipped with a GPS unit is designed to drift on the surface of the water. Its driving force is the fluid resistance exerted on a pair of rectangular plates. While it travels over the surface, the GPS unit evaluates its position every second, and spatiotemporal data that specify its motion are transmitted to be recorded. Results of experiments conducted to study unsteady flows generated in Kojima Lake are introduced. |
| Keywords | water environment global positioning system |
| Publication Title | 岡山大学環境理工学部研究報告 |
| Published Date | 2003-03 |
| Volume | volume8 |
| Issue | issue1 |
| Start Page | 23 |
| End Page | 26 |
| ISSN | 1341-9099 |
| language | English |
| File Version | publisher |
| NAID | 120002313912 |
| JaLCDOI | 10.18926/fest/11522 |
|---|---|
| FullText URL | 006_011_015.pdf |
| Author | Watanabe, Masaji| Kunisada, Shigeyuki| |
| Abstract | The global positioning system is utilized in lake flow analysis to facilitate experimental evaluation for numerical results of a lake flow simulation. In our lake flow experiment a float travels on the lake surface receiving the fluid resistance due to lake flow, while a global positioning system receiver keeps track of its position. A momentum equation is derived when the product of the float mass and its acceleration is set equal to the driving force. The temporal change in the position of the float can be simulated when numerical solutions of lake flow equations are given. A comparison of numerical results and experimental data leads to an evaluation of the numerical simulation of lake flow. |
| Keywords | lake flow numerical simulation GPS-float finite element method |
| Publication Title | 岡山大学環境理工学部研究報告 |
| Published Date | 2001-02-28 |
| Volume | volume6 |
| Issue | issue1 |
| Start Page | 11 |
| End Page | 15 |
| ISSN | 1341-9099 |
| language | English |
| File Version | publisher |
| NAID | 120002313583 |
| JaLCDOI | 10.18926/fest/11556 |
|---|---|
| FullText URL | 003_011_024.pdf |
| Author | Watanabe, Masaji| |
| Abstract | We study a system that models a problem in which an oscillatory unit is coupled to a passive medium. We analyze the case in which an RCL circuit is coupled to an RC circuit. Some numerical results indicate when slow oscillations occur in coupled systems. |
| Keywords | coupled circuits Van der Pol's equation slow oscillations |
| Publication Title | 岡山大学環境理工学部研究報告 |
| Published Date | 1998-01-14 |
| Volume | volume3 |
| Issue | issue1 |
| Start Page | 11 |
| End Page | 24 |
| ISSN | 1341-9099 |
| language | English |
| File Version | publisher |
| NAID | 120002313697 |
| JaLCDOI | 10.18926/fest/11559 |
|---|---|
| FullText URL | 005_031_034.pdf |
| Author | Watanabe, Masaji| |
| Abstract | We study unsteady flow that models lake flow in Kojima Lake. We assume that a lake is connected to another area with gates, and that those gates are opened when the water level outside the gates is lower than the water level of the lake. We study unsteady flow due to the opening of the gates. We analyze the problem with the finite element method, and take detailed structures of the gates into account. |
| Keywords | unsteady flow lake flow finite element method |
| Publication Title | 岡山大学環境理工学部研究報告 |
| Published Date | 2000-02-29 |
| Volume | volume5 |
| Issue | issue1 |
| Start Page | 31 |
| End Page | 34 |
| ISSN | 1341-9099 |
| language | English |
| File Version | publisher |
| NAID | 120002313848 |
| JaLCDOI | 10.18926/fest/11523 |
|---|---|
| FullText URL | 007_039_044.pdf |
| Author | Watanabe, Masaji| |
| Abstract | We present some results of a finite element analysis for an unsteady flow in Kojima Lake. We also present an experimental result. The global positioning system was utilized in the experiment in order to record the temporal and the spatial data of a float traveling with the driving force of the fluid resistance. The spatial and temporal data were recorded to examine their correspondence with analytical results. |
| Keywords | lake flow numerical simulation finite element method global positioning system |
| Publication Title | 岡山大学環境理工学部研究報告 |
| Published Date | 2002-03-22 |
| Volume | volume7 |
| Issue | issue1 |
| Start Page | 39 |
| End Page | 44 |
| ISSN | 1341-9099 |
| language | English |
| File Version | publisher |
| NAID | 120002313386 |
