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modelling of interactive populations of disperse systems

Modelling of interactive populations of disperse systems

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2nd International conference on Population Balance modelling

作者： Lakatos, BG Mihálykó, C Blickle, T Univ Veszprem Dept Proc Engn H-8200 Veszprem Hungary Univ Veszprem Dept Math & Comp H-8200 Veszprem Hungary Univ Veszprem Inst Chem & Proc Engn H-8200 Veszprem Hungary

The paper presents a general mathematical model for disperse systems in which direct interactions between particles are taken into consideration. The model is formulated in terms of transition measures, introduced on the basis of conditional Markov processes. The population balance equation, describing the behaviour of interactive populations, is developed in a general form of continuous and discontinuous terms. Moment equations are presented and analysed for the axial dispersion model with interparticle exchange processes of heat and mass. The applicability of the model is illustrated by applying it for describing a process of heating particles by gas with interparticle heat transfer, and a mass exchange process between fluid particles. (c) 2005 Elsevier Ltd. All rights reserved.

关键词： population balance Markov process interactive population measure interparticle heat and mass transfer moment equations

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Fuzzy rule based facial expression recognition

Fuzzy rule based facial expression recognition

引用

CIMCA 2006: International conference on Computational Intelligence for modelling, Control and Automation, Jointly with IAWTIC 2006: International conference on Intelligent Agents Web Technologies and International Commerce

作者： Mufti, Muid Khanam, Assia University of Engineering and Technology Taxila Pakistan National University of Sciences and Technology Rawalpindi Pakistan

ISBN: (纸本)0769527310

Facial expressions are a key modality in human communication. Facial expressions occur simultaneously with social interaction and help in interpretation of spoken communication. The understanding of facial expressions is a basic requirement in the development of next generation human computer interaction (HCI) systems. Facial expressions, however, are qualitative in nature and it is very difficult to explain them by a mathematical model. This paper presents a system framework that uses fuzzy logic principles to recognize facial expressions in video sequences. The system uses image processing techniques to detect MPEG4 Facial Animation Parameters (FAPs) in an input video. A fuzzy rule base has been developed to interpret the collective set of FAPs as constituting a particular facial expression. © 2006 IEEE.

关键词： Face recognition

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Investigation into modelling of a fuel cell stack system

Investigation into modelling of a fuel cell stack system

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41st International Universities Power engineering conference

作者： Ali, D. Morsi Salman, S. K. Robert Gordon Univ Aberdeen AB9 1FR Scotland

ISBN: (纸本)9781861353429

Noticing the rise in the electricity prices, worrying about the CO(2) emissions and global warming and not sure about living with nuclear Power stations, makes everyone think from where energy will come in the coming years. What is needed is a zero-emission distribution generation technology or combination of technologies that allows clean, cost effective supply of energy, on demand on a large scale and in any location. In response a momentous energy revolution is taking place, renewable energy generation or decentralized power systems like wind, photovoltaic, as well as new hydrogen and fuel cells technologies are developing nowadays to take over from fossil hydrocarbons combustion. This paper proposes a model for the simulation and performance evaluation of a Polymer Electrolyte Membrane (PEM) fuel cell generation system. Although other models [1-6] have been produced, the proposed model strength is modularizing the fundamental thermal-physical behaviour of a fuel cell stack to develop a modular block that can be used as a part of any other schematic solution required for fuel cells' study. The developed modular block (prototype) makes the model easy to modify to allow the simulation of any PEMFC with different cell parameters and allows investigation of its behaviour for any operating or design configuration. It is also useful for the study of integration of fuel cells in distribution power systems (which is promising especially to systems with variable output renewable sources as it can store their excess power thus improving the overall system stability). The proposed model exhibits most of the basic fuel cell properties and incorporates essential physical and electrochemical processes that happen along its operation, thus it can be moderated to model any other fuel cell' type. The proposed model prototype was verified and compared to another simplified model [21 by generating sample results for a Ballard V Proton Exchange Membrane Fuel Cell (PEMFC) stack. Resu

关键词： renewable energy clean environment fuel cells mathematical modelling block simulation

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Application of the camel^® process simulator to the dynamic simulation of gas turbines 19

Application of the camel<SUP>®</SUP> process simulator to t...

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19th International conference on Efficiency, Cost, Optimization, Simulation and Environmental Impact of Energy Systems (ECOS 2006)

作者： Cennerilli, S. Fiorini, P. Sciubba, E. Univ Roma 1 La Sapienza Dept Mech & Aeronaut Engn Via Eudossiana 18 I-00184 Rome Italy

ISBN: (纸本)9789608758421

This work presents the development of a modular code for simulating the dynamic behaviour of a single-shaft gas turbine and an application to a micro-gas turbine (50 kW). The simulation package, CAMEL (R), is a modular and object-oriented process simulator for energy conversion systems, conceived and developed in the last decade by the Authors' group at the Mechanical and Aeronautical engineering Department of the University of Roma 1 "La Sapienza";the advantages given by the object-oriented approach are the flexibility and the user-friendly interface. The component library of the original (steady-state) code has been augmented by implementing the dynamic models of all of the gas turbine components: the method is still based on a classical black-box modelling and each component can be assembled as in an engineering scheme process in which the connections between two elements represent either a mechanical power coupling or a working fluid stream. In order to obtain an accurate description of the gas turbine phenomenology, the components are described by a set of both linear and non-linear first-order differential- and algebraic equations. The global non-linear system is solved by means of a 4(th) order Runge-Kutta method. The paper provides a description of the mathematical model adopted for the simulation. A complete dynamic simulation of the plant is performed, starting from steady state operation. Both time variable and fixed rotational speed are considered. Three different time-profiles for the rate of variation of the fuel supply have been examined: a pulse, a heavyside-like tooth-wave and a linear slope. All computed behaviours of the main process parameters have been reported, commented on and justified. The program has been tested both in a steady-state off-design simulation and in a fully dynamic simulation. In all tests the code performed properly, reproducing with good accuracy the behaviour of the real gas turbine.

关键词： dynamic modelling dynamic simulation object-oriented simulation

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human expert modelling using semantics-oriented video retrieval for surveillance in hard industry 06

Human expert modelling using semantics-oriented video retrie...

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2nd International conference on Mobile Multimedia Communications, MobiMedia '06

作者： Praks, Pavel Cernohorský, Jindrich Svátek, Vojtech Dept. Of Information and Knowledge Engineering University of Economics Prague W. Churchill Sq. 4 130 67 Praha 3 Czech Republic Dept. of Measurement and Control VŠB - Technical University of Ostrava 17. listopadu 15 708 33 Ostrava Czech Republic Dept. of Mathematics and Descriptive Geometry Center of Quality and Reliability of Production VŠB - Technical University of Ostrava 17. listopadu 15 708 33 Ostrava Czech Republic Centre of Applied Cybernetics

ISBN: (纸本)9781595935175

The surveillance application aims at improving the quality of technology via modelling human expert behaviour in the coking plant Mittal Steel Ostrava, the Czech Republic. Video data on several industrial processes are captured by means of a CCD camera and classified by using Latent Semantic Indexing (LSI) with the respect to etalons classified by an expert. We also investigate the possibility to combine LSI with color histogram analysis, using experience from our prior research on web image classification. © 2006 ACM.

关键词： Singular value decomposition

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Intelligent virtual interface for improving performance in HPC centers by modelling users and their satisfaction

Intelligent virtual interface for improving performance in H...

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2006 IEEE International conference on Virtual Environments, human-Computer Interfaces and Measurement Systems, VECIMS 2006

作者： Monroy, J. Becerra, J.A. Bellas, F. Duro, R.J. Integrated Group for Engineering Research Universidade da Corufia Spain

ISBN: (纸本)1424402433

This paper deals with the implementation of a new approach that aims to improve the performance of High Performance Computing (HPC) centers through an agent based virtual interface that models the user behaviour and satisfaction. This interface translates user requests and satisfaction criteria into what is really necessary and, thus, permits the optimization of the HPC center's scheduler taking into account predicted user satisfaction together with the objectives of the management in terms of resource usage and cost. The system is based on an evolutionary profiling agent based architecture where the different agents are evolved in real time to adapt to the different users. These agents cooperate with the scheduling mechanism providing resource usage estimations for the different tasks, as well as predicting the effect of possible strategies on user satisfaction. Some experiments are presented where this system interacts with a real Job Management System (SGE) and we show that modelling the user and taking user satisfaction into account helps to improve system performance. © 2006 IEEE.

关键词： Interfaces (computer)

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Towards a holistic Conceptual modelling-based software development process

Towards a holistic Conceptual Modelling-based software devel...

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25th International conference on Conceptual Modeling - ER 2006

作者： España, Sergio Panach, José Ignacio Pederiva, Inés Pastor, Óscar Department of Information Systems and Computation Valencia University of Technology Camino de Vera s/n 46022 Valencia Spain

ISBN: (纸本)354047224X

Traditionally, the Conceptual modelling (CM) community has been interested in defining methods to model Information Systems by specifying their data and behaviour, disregarding user interaction. On the other hand, the human-Computer Interaction (HCI) community has defined techniques oriented to the modelling of the interaction between the user and the system, proposing a user-centred software construction, but leaving out details on system data and behaviour. This paper aspires to reconcile both visions by integrating task modelling techniques using a sound, conceptual model-based software development process in a HCI context. The system is considered on its three axis (data, functionality and interaction), as a whole. The use of CTT (Concurrent Task Trees) embedded in a model-based approach makes it possible to establish mapping rules between task structure patterns that describe interaction and the elements of the abstract interface model. By defining such structural patterns, the CTT notation is much more manageable and productive;therefore, this HCI technique can be easily integrated in a well-established conceptual modelling approach. This proposal is underpinned by the MDA-based technology OlivaNova Method Execution, which allows real automatic software generation, while still taking user interface into account at an early requirements elicitation stage. © Springer-Verlag Berlin Heidelberg 2006.

关键词： Software engineering

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mathematical modelling and analysis of river flows in transitional waters

引用

International conference on Fluvial Hydraulics

作者： Santos, M. Hipolito, J. Polytechn Inst Beja ESTIG Beja Portugal Univ Tecn Lisboa IST Lisbon Portugal

ISBN: (纸本)0415408156

River flows in transitional regions, between inland surface waters and coastal waters, suffer the effects of downstream boundary tides that may enhance several river events or phenomena like floods and erosions among others. The purpose of this paper is to present the study carried out to analyse the influence of tides in the river suberitical flows. So, based on the complete 1-D Saint-Venant equations and using the implicit Preissmann finite-difference method, a mathematical model was developed to simulate one-dimensional unsteady flows in rivers, with irregular and variable cross-sections. The model was applied to the Sado river, more precisely, to a reach of this Portuguese river, right upstream Alcacer do Sal city, in which the fluvial flows are influenced by the tide and during flood events has caused important damage, either human or material. Discharge rating functions on the last section of the river reach were analysed and are described. The correlations between some of the rating functions and the results of the model are quite good. The contributions to the friction slope value of each one of its dynamic components in the last downstream spatial step are also presented.

关键词： Rivers

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Static and dynamic properties of passive skeletal muscle under compressive loading

Static and dynamic properties of passive skeletal muscle und...

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2006 International IRCOBI conference on the Biomechanics of Impact

作者： Van Loocke, M. Simms, C.K. Lyons, C.G. Centre for Bioengineering Department of Mechanical and Manufacturing Engineering Trinity College Dublin Ireland

ISBN: (纸本)2951421079

A better characterisation of skeletal muscle is required to improve the accuracy of human body models used for virtual modelling. In this study, the quasi-static and dynamic properties of porcine muscle tissue have been investigated using uniaxial unconfined compression tests performed on samples oriented at various angles from the muscle fibre direction. Quasi-static tests show that the weakest direction is at 45° from the fibre direction. A model based on linear elasticity for transversely isotropic bodies extended with strain dependent Young's moduli fits the quasi-static data very well. Results from the dynamic tests show that muscle tissue presents anisotropic viscoelastic behaviour.

关键词： Elastic moduli

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mathematical models of gear rattle in roots blower vacuum pumps

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6th International conference on Modern Practice in Stress and Vibration Analysis

作者： Mason, J. F. Homer, M. E. Wilson, R. E. Univ Bristol Bristol Ctr Appl Nonlinear Math Bristol BS8 1TR Avon England

ISBN: (纸本)0878494189

This paper is concerned with the modelling of gear rattle in Roots blower vacuum pumps. Analysis of experimental data reveals that the source of the noise and vibration problem is the backlash nonlinearity due to gear teeth losing and re-establishing contact. We develop nonsmooth ordinary differential equation models for the dynamics of the pump. The models include a time-dependent forcing term which arises from the imperfect, eccentric mounting of the gears. We use a combination of explicit construction, asymptotic methods and numerical techniques to classify complicated dynamic behaviour in realistic parametric regimes. We first present a linear analysis of motions where the gears do not lose contact, and develop upper bounds on eccentricity for quiet operation. We then develop a nonlinear analysis of 'backlash oscillations', where the gears lose and re-establish contact, corresponding to noisy pump operation. It is found that noisy solutions can coexist with silent ones, explaining why geared systems can rattle intermittently. We then consider several possible design solutions, and show their implications for pump design in terms of the existence and stability of silent and noisy solutions. Finally, we present conclusions and possibilities for future work.

关键词： gears rattle nonsmooth modelling backlash

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