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System Modelling (system + modelling)

Distribution by Scientific Domains

Engineering	40%

Selected Abstracts

Urban Water Systems Modelling for Water Removal and Ecological Functions William James (Ed) Practical Modeling of Urban Water Systems: Monograph 11 Computaional Hydraulics Int., Guelph, Canada, 511 pp, 2003, ISBN 0-968-36817-4

HYDROLOGICAL PROCESSES, Issue 3 2004
Theodore A. Endreny
First page of article [source]

PEFC Stack Operating in Anodic Dead End Mode,

FUEL CELLS, Issue 4 2004
L. Dumercy
Abstract The polymer electrolyte fuel cell,(PEFC) system is considered as an alternative power source and is particularly promising for mobile applications. This paper reports some experimental results performed on a PEFC stack, operating in anodic dead end mode. The flush frequency of the anode is investigated. In order to reduce hydrogen consumption in an embedded application, the flush frequency could be calculated from system modelling, according to the operating conditions. The first step of such a model is presented. It simulates the water exchanges between the anode and cathode channels in the anode dead end case. It has been implemented in a MATLAB® environment. [source]

Adaptive moving mesh methods for simulating one-dimensional groundwater problems with sharp moving fronts

INTERNATIONAL JOURNAL FOR NUMERICAL METHODS IN ENGINEERING, Issue 11 2002
Weizhang Huang
Abstract Accurate modelling of groundwater flow and transport with sharp moving fronts often involves high computational cost, when a fixed/uniform mesh is used. In this paper, we investigate the modelling of groundwater problems using a particular adaptive mesh method called the moving mesh partial differential equation approach. With this approach, the mesh is dynamically relocated through a partial differential equation to capture the evolving sharp fronts with a relatively small number of grid points. The mesh movement and physical system modelling are realized by solving the mesh movement and physical partial differential equations alternately. The method is applied to the modelling of a range of groundwater problems, including advection dominated chemical transport and reaction, non-linear infiltration in soil, and the coupling of density dependent flow and transport. Numerical results demonstrate that sharp moving fronts can be accurately and efficiently captured by the moving mesh approach. Also addressed are important implementation strategies, e.g. the construction of the monitor function based on the interpolation error, control of mesh concentration, and two-layer mesh movement. Copyright © 2002 John Wiley & Sons, Ltd. [source]

Local solutions to a model of piezoelectric materials

MATHEMATICAL METHODS IN THE APPLIED SCIENCES, Issue 14 2004
Kamel Hamdache
Abstract A local existence theorem is proved for a non-linear coupled system modelling the electromechanical motion of a one-dimensional piezoelectric body with domain switching. The system is composed by a heat equation describing the behaviour of the number of electric dipoles and by a wave equation governing the dynamic of the electric displacement. The main coupling in the system appears in the time-dependent velocity of the waves depending on the number of electric dipoles. The proof of the result relies on a time decay estimate satisfied by the number of electric dipoles and an uniform estimate of the solution of the regularized wave equation. Copyright © 2004 John Wiley & Sons, Ltd. [source]

Enhancing systems-thinking skills with modelling

BRITISH JOURNAL OF EDUCATIONAL TECHNOLOGY, Issue 6 2008
Woei Hung
Systems thinking is an essential cognitive skill that enables individuals to develop an integrative understanding of a given subject at the conceptual and systemic level. Yet, systems thinking is not usually an innate skill. Helping students develop systems-thinking skills warrants attention from educators. This paper describes a study examining the effects of utilising systems modelling as a cognitive tool in enhancing a group of graduate students' systems-thinking skills. A significant improvement was observed in the systems-thinking practises of the students. A theoretical rationale for enhancing systems-thinking skills with modelling and the results of the study will be discussed. [source]