Author Putri, Arrival Rince| Nova, Tertia Delia| Watanabe, Masaji|
Published Date 2016
Publication Title AIP Conference Proceedings
Volume volume1707
Content Type Conference Paper
Author Wardhani, Puteri Kusuma| Watanabe, Masaji|
Published Date 2016
Publication Title AIP Conference Proceedings
Volume volume1707
Content Type Conference Paper
Author Watanabe, Masaji| Kawai, Fusako|
Published Date 2003-08
Publication Title 環境制御
Volume volume25
Content Type Departmental Bulletin Paper
Author Watanabe, Masaji| Kawai, Fusako|
Published Date 2004-11
Publication Title 環境制御
Volume volume26
Content Type Departmental Bulletin Paper
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 英語
File Version publisher
NAID 120002309099
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 英語
File Version publisher
NAID 120002304776
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 英語
File Version publisher
NAID 120002313699
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 英語
File Version publisher
NAID 120002313787
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 英語
File Version publisher
NAID 120002313835
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 英語
File Version publisher
NAID 120002313848
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 英語
File Version publisher
NAID 120002313697
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 英語
File Version publisher
NAID 120002313386
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 英語
File Version publisher
NAID 120002313583
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 英語
File Version publisher
NAID 120002313912
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 英語
File Version publisher
NAID 120002313649
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 日本語
File Version publisher
NAID 120002313754
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 英語
File Version publisher
NAID 120002313924
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 英語
File Version publisher
NAID 120002314045
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 英語
File Version publisher
NAID 120002313599