著者 渡辺 雅二| 河合 富佐子|
発行日 2004-11
出版物タイトル 環境制御
26巻
資料タイプ 紀要論文
著者 渡辺 雅二| 河合 富佐子|
発行日 2003-08
出版物タイトル 環境制御
25巻
資料タイプ 紀要論文
JaLCDOI 10.18926/fest/11457
タイトル(別表記) Study on Effects of the Density Current Generator by Experiment and Measurement
フルテキストURL 009_059_064.pdf
著者 渡辺 雅二| 山磨 敏夫|
抄録 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.
キーワード density current stratification water environment
出版物タイトル 岡山大学環境理工学部研究報告
発行日 2004-02-27
9巻
1号
開始ページ 59
終了ページ 64
ISSN 1341-9099
言語 Japanese
論文のバージョン publisher
NAID 120002313754
JaLCDOI 10.18926/fest/11613
フルテキストURL 001_055_064.pdf
著者 渡辺 雅二|
抄録 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.
キーワード periodic forcing nonlinear oscillators excitable systems couples systems.
出版物タイトル 岡山大学環境理工学部研究報告
発行日 1996-03
1巻
1号
開始ページ 55
終了ページ 64
ISSN 1341-9099
言語 English
論文のバージョン publisher
NAID 120002313699
JaLCDOI 10.18926/fest/11596
フルテキストURL 002_019_024.pdf
著者 渡辺 雅二|
抄録 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.
出版物タイトル 岡山大学環境理工学部研究報告
発行日 1997-01-10
2巻
1号
開始ページ 19
終了ページ 24
ISSN 1341-9099
言語 English
論文のバージョン publisher
NAID 120002313835
著者 Wardhani, Puteri Kusuma| Watanabe, Masaji|
発行日 2016
出版物タイトル AIP Conference Proceedings
1707巻
資料タイプ 会議発表論文
JaLCDOI 10.18926/fest/11421
フルテキストURL 012_001_006.pdf
著者 渡邊 雅二| 河合 富佐子|
抄録 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.
キーワード biodegradation polyethylene glycol mathematical model numerical simulation
出版物タイトル 岡山大学環境理工学部研究報告
発行日 2007-03-15
12巻
1号
開始ページ 1
終了ページ 6
ISSN 1341-9099
言語 English
論文のバージョン publisher
NAID 120002313599
JaLCDOI 10.18926/fest/11452
フルテキストURL 011_015_018.pdf
著者 渡辺 雅二| Liu Ying| Wang Ming Jun|
抄録 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.
キーワード tsunami finite elements numerical simulation
出版物タイトル 岡山大学環境理工学部研究報告
発行日 2006-03-15
11巻
1号
開始ページ 15
終了ページ 18
ISSN 1341-9099
言語 English
論文のバージョン publisher
NAID 120002314045
JaLCDOI 10.18926/fest/12828
フルテキストURL 13_057_062.pdf
著者 Liu Ying| 角田 晋哉| Ceric Majda| 山本 和弘| 渡邊 雅二|
抄録 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.
キーワード tsunami finite difference staggered grid leapfrog
出版物タイトル 岡山大学環境理工学部研究報告
発行日 2008-03
13巻
1号
開始ページ 57
終了ページ 62
ISSN 1341-9099
言語 English
論文のバージョン publisher
NAID 120002304776
著者 Putri, Arrival Rince| Nova, Tertia Delia| Watanabe, Masaji|
発行日 2016
出版物タイトル AIP Conference Proceedings
1707巻
資料タイプ 会議発表論文
JaLCDOI 10.18926/fest/11456
フルテキストURL 009_053_058.pdf
著者 Numaguchi Satoshi| Med Mahmoud Ould Med Lemine| 渡辺 雅二|
抄録 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.
キーワード water environment global positioning system numerical simulation
出版物タイトル 岡山大学環境理工学部研究報告
発行日 2004-02-27
9巻
1号
開始ページ 53
終了ページ 58
ISSN 1341-9099
言語 English
論文のバージョン publisher
NAID 120002313924
JaLCDOI 10.18926/fest/11610
フルテキストURL 001_047_053.pdf
著者 佐々木 徹| 石川 洋文| 梶原 毅| 渡辺 雅二|
抄録 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.
キーワード Kojima lake Water analysis Finite element method
出版物タイトル 岡山大学環境理工学部研究報告
発行日 1996-03
1巻
1号
開始ページ 47
終了ページ 53
ISSN 1341-9099
言語 English
論文のバージョン publisher
NAID 120002313787
JaLCDOI 10.18926/fest/11484
フルテキストURL 010_023_028.pdf
著者 渡辺 雅二| Liu Ying| Wang Ming Jun|
抄録 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.
キーワード water environment finite element method numerical simulation
出版物タイトル 岡山大学環境理工学部研究報告
発行日 2005-02-28
10巻
1号
開始ページ 23
終了ページ 28
ISSN 1341-9099
言語 English
論文のバージョン publisher
NAID 120002313649
JaLCDOI 10.18926/fest/19695
フルテキストURL 004_001_006.pdf
著者 渡辺 雅二|
抄録 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.
キーワード circadian rhythm glycolytic oscillation nonlinear oscillator
出版物タイトル 岡山大学環境理工学部研究報告
発行日 1999-02-26
4巻
1号
開始ページ 1
終了ページ 6
ISSN 1341-9099
言語 English
論文のバージョン publisher
NAID 120002309099
JaLCDOI 10.18926/fest/11497
フルテキストURL 008_023_026.pdf
著者 渡辺 雅二| Numaguchi Satoshi|
抄録 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.
キーワード water environment global positioning system
出版物タイトル 岡山大学環境理工学部研究報告
発行日 2003-03
8巻
1号
開始ページ 23
終了ページ 26
ISSN 1341-9099
言語 English
論文のバージョン publisher
NAID 120002313912
JaLCDOI 10.18926/fest/11522
フルテキストURL 006_011_015.pdf
著者 渡辺 雅二| 國貞 茂幸|
抄録 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.
キーワード lake flow numerical simulation GPS-float finite element method
出版物タイトル 岡山大学環境理工学部研究報告
発行日 2001-02-28
6巻
1号
開始ページ 11
終了ページ 15
ISSN 1341-9099
言語 English
論文のバージョン publisher
NAID 120002313583
JaLCDOI 10.18926/fest/11556
フルテキストURL 003_011_024.pdf
著者 渡辺 雅二|
抄録 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.
キーワード coupled circuits Van der Pol's equation slow oscillations
出版物タイトル 岡山大学環境理工学部研究報告
発行日 1998-01-14
3巻
1号
開始ページ 11
終了ページ 24
ISSN 1341-9099
言語 English
論文のバージョン publisher
NAID 120002313697
JaLCDOI 10.18926/fest/11559
フルテキストURL 005_031_034.pdf
著者 渡辺 雅二|
抄録 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.
キーワード unsteady flow lake flow finite element method
出版物タイトル 岡山大学環境理工学部研究報告
発行日 2000-02-29
5巻
1号
開始ページ 31
終了ページ 34
ISSN 1341-9099
言語 English
論文のバージョン publisher
NAID 120002313848
JaLCDOI 10.18926/fest/11523
フルテキストURL 007_039_044.pdf
著者 渡辺 雅二|
抄録 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.
キーワード lake flow numerical simulation finite element method global positioning system
出版物タイトル 岡山大学環境理工学部研究報告
発行日 2002-03-22
7巻
1号
開始ページ 39
終了ページ 44
ISSN 1341-9099
言語 English
論文のバージョン publisher
NAID 120002313386