References of "Paper published in a book"
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See detailMale hypogonadism caused by insolated LH deficiency : From pathology to gene, from gene to physiology
Valdes Socin, Hernan Gonzalo ULg; Salvi, R.; Pralong, F. et al

in 12th International Congress of Endocrinology - Abstract book (2004)

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See detailLes évaluations externes organisées en Communauté française de Belgique : quelques questionnements autour des notions de qualité, de pertinence sociale et d'équité
Fagnant, Annick ULg; Demonty, Isabelle ULg

in Evaluation entre équité et efficacité, Actes du XVIe colloque international de l'Admée-Europe, Liège, 4-6 septembre 2003. Les cahiers du Service de Pédagogie expérimentale, 15/16 (2004) (2004)

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See detailExtraction of land use / landcover – related information from very high resolution data in urban and suburban areas
Van de Voorde, Tim; De Genst, William; Canters, Frank et al

in Goossens, Rudi (Ed.) Remote Sensing in Transition (2004)

Very High Resolution (VHR) satellite images offer a great potential for the extraction of landuse and land-cover related information for urban areas. The available techniques are diverse and need to be ... [more ▼]

Very High Resolution (VHR) satellite images offer a great potential for the extraction of landuse and land-cover related information for urban areas. The available techniques are diverse and need to be further examined before operational use is possible. In this paper we applied two pixel-by-pixel classification techniques and the object-oriented image analysis approach (eCognition) for a land-cover classification of a Quickbird image of a study area in the northern part of the city of Ghent (Belgium). Only small differences in overall Kappa were noted between the best results of the pixel-based approach (neural network classification with Haralick texture measures) and the object-oriented classification (eCognition). A rule-based procedure using ancillary information on elevation derived from a digital surface model was applied on the pixel-based land-cover classification in order to obtain information on the spatial distribution of buildings and artificial surfaces. [less ▲]

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See detailConception et évaluation d’un cours en ligne destiné à améliorer les compétences de futurs enseignants en Education physique à l’analyse de tâche. Des savoirs techniques aux compétences pédagogiques.
Delfosse, Catherine ULg; Lenzen, Benoît; Cloes, Marc ULg

in Herphelin, M. (Ed.) Actes du 3ème Congrès des Chercheurs en Education. (Re)trouver le plaisir d'enseigner et d'apprendre. Construire savoirs et compétences (2004)

Ce cours utilise la plate-forme d’enseignement à distance WebCT et est accessible aux étudiants via Internet. Il s’adresse en priorité aux étudiants de 2ème candidature en éducation physique de ... [more ▼]

Ce cours utilise la plate-forme d’enseignement à distance WebCT et est accessible aux étudiants via Internet. Il s’adresse en priorité aux étudiants de 2ème candidature en éducation physique de l’Université de Liège mais pourrait être utilement proposé aux enseignants en formation continuée voire aux entraîneurs. Ce cours a été conçu dans le cadre du DES Formasup en Pédagogie Universitaire de l’Université de Liège, orientation EAD (enseignement à distance) par Benoît Lenzen, Assistant au Département des APS, en collaboration avec le LabSET (Laboratoire de Soutien à l’Enseignement Télématique). Ce travail constitue la première étape d’une réflexion plus large entamée sur la liaison entre apprentissage théorique et travail de terrain. [less ▲]

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See detailBias-variance tradeoff of soft decision trees
Olaru, Cristina; Wehenkel, Louis ULg

(2004)

This paper focuses on the study of the error composition of a fuzzy decision tree induction method recently proposed by the authors, called soft decision trees. This error may be expressed as a sum of ... [more ▼]

This paper focuses on the study of the error composition of a fuzzy decision tree induction method recently proposed by the authors, called soft decision trees. This error may be expressed as a sum of three types of error: residual error, bias and variance. The paper studies empirically the tradeoff between bias and variance in a soft decision tree method and compares it with the tradeoff of classical crisp regression and classification trees. The main conclusion is that the reduced prediction variance of fuzzy trees is the main reason for their improved performance with respect to crisp ones. [less ▲]

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See detailDoppler echocardiographic repercussions of a 12 week treadmill training period in Standardbreds
Amory, Hélène ULg; De Moffarts, Brieuc; Art, Tatiana ULg et al

in 43rd Congress of the British Equine Veterinary Association (2004)

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See detailOperation rules determined by risk analysis for special protection systems at Hydro-Québec
Huang, Jinan; Vanier, Guy; Valette, Alain et al

(2004)

This paper describes a new approach used by Hydro-Québec to determine the rules of automatic devices installed in its main power plants to maintain secure operation under extreme contingencies. An example ... [more ▼]

This paper describes a new approach used by Hydro-Québec to determine the rules of automatic devices installed in its main power plants to maintain secure operation under extreme contingencies. An example of application of this approach is given to illustrate how to apply data mining technique for the rules of the automatic generator rejection and remote load shedding system (RPTC: Rejet de Production et Télédélestage de Charges in French) installed at the Churchill Falls hydroelectric power plant (5500 MW) in Labrador. Real time snapshots of the Hydro-Québec power system collected over several years data have been used to generate large amounts of results (database) by transient stability simulations. The database is processed by the data mining software developed by the University of Liege to construct the decision trees. This approach gives the most relevant parameters and finds optimal settings for the RPTC system at the Churchill Falls, minimizing the number of generator rejection while maintaining the same performance in terms of security coverage. New operation rules have thus been established. [less ▲]

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See detailSevere fungal pneumonia in harbour porpoises stranded on belgian and french coastline in 2003
Jauniaux, Thierry ULg; Mignon, Bernard ULg; Coignoul, Freddy ULg

in Annual proceedings of the 18th annual conference of the European Cetacean Society (2004)

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See detailLate Frasnian Atrypida (Brachiopoda) from the Ardenne shelf (southern Belgium)
Mottequin, Bernard ULg

in Anonymous (Ed.) Abstracts with programme of the 48th Palaeontological Association Annual Meeting (2004)

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See detailEvaluation et correction du stress oxydant
de Moffarts, Brieuc; Kirschvink, Nathalie; Lekeux, Pierre ULg

in XXIème Journée d’Etude de la Belgian Equine Practitioners Society (BEPS) (2004)

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See detailNash equilibria and reinforcement learning for active decision maker modelling in power markets
Krause, Thilo; Andersson, Goran; Ernst, Damien ULg et al

in Proceedings of the 6th IAEE European Conference: Modelling in Energy Economics and Policy (2004)

In this paper, we study the behavior of power suppliers who submit their bids to the market place in order to maximize their payoffs. The market clearing mechanism is based on the locational marginal ... [more ▼]

In this paper, we study the behavior of power suppliers who submit their bids to the market place in order to maximize their payoffs. The market clearing mechanism is based on the locational marginal price. To study the interaction of the power suppliers, we rely on two different approaches and compare the results obtained. One approach consists of computing the Nash equilibria of the market, and the other models each player’s behavior by using reinforcement learning algorithms. Simulations are carried out on a five node power system. [less ▲]

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See detailA qui profite la justice ? Normes, sentiments et critères de justice des élèves et enseignants de 2e année de l'enseignement secondaire en Communauté française de Belgique
Baye, Ariane ULg

in Actes du 3e congrès des chercheurs en éducation, Université Libre de Bruxelles, 16-17 mars 2004 (2004)

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See detailUne définition opérationnelle de la Métacognition et ses mises en oeuvre
Leclercq, Dieudonné ULg; Poumay, Marianne ULg

in 21e colloque de l'Association Internationale de Pédagogie Universitaire (A.I.P.U.) Université Cadi Ayyad de Marrakech (Maroc). "L'AIPU : 20 ans de recherches et d'actions pédagogiques; bilan et perspectives." (2004)

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See detailLe sang, l’argent, l’information : allégorie des réseaux de communication dans Le Comte de Monte-Cristo
Durand, Pascal ULg

in IVe Actas do Congresso internacional da Associaçao Portuguesa de Literatura Comparada (2004)

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See detailInteractive Selection of Visual Features through Reinforcement Learning
Jodogne, Sébastien ULg; Piater, Justus ULg

in 24th SGAI International Conference on Innovative Techniques and Applications of Artificial Intelligence (2004)

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See detailIncremental Rectification of Sports Fields in Video Streams With Application to Soccer
Hayet, Jean-Bernard; Piater, Justus ULg; Verly, Jacques ULg

in Advanced Concepts for Intelligent Vision Systems (2004)

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See detailEvaluer et comparer l'équité des systèmes éducatifs grâce à un système d'indicateurs
Baye, Ariane ULg; Nicaise, Julien

in Actes du XVIe colloque international de l'Admée-Europe, Liège, 4-6 septembre 2003 (2004)

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See detailHow can intermodal transport support the logistical strategies of enterprises: a study on the opportunities and bottlenecks
Marchal, Jean ULg; Macharis, C.; Lundoluka, F. et al

in How can intermodal transport support the logistical strategies of enterprises: a study on the opportunities and bottlenecks (2004)

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See detailUse of mapped SSR markers to assist the selection of low-gossypol seeds and high-gossypol plant cultivars in upland cotton
Benbouza, H.; Lacape, M.; Jacquemin, J. M. et al

in Proceedings of the 2004 International cotton initiative workshop (2004)

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See detailMarket dynamics driven by the decision-making of both power producers and transmission owners
Minoia, Anna; Ernst, Damien ULg; Ilic, Marija

in Proceedings of the IEEE Power Engineering Society General Meeting 2004 (2004)

In this paper we consider an electricity market in which not only the power producers but also the transmission owners can submit a bid. The market is cleared at each stage by minimizing the sum of the ... [more ▼]

In this paper we consider an electricity market in which not only the power producers but also the transmission owners can submit a bid. The market is cleared at each stage by minimizing the sum of the production prices and the transmission prices. A model of the strategic behavior is formulated for the different agents of the system. This strategic behavior modelling leads to a market dynamics that can be used to determine the different payoffs of the agents over a temporal horizon. Simulations are carried out for several configurations of this two node power system. The influence of the transfer capacity and the market structure on the payoffs of the different agents is discussed. [less ▲]

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See detailPositive and negative aspects of « Sport + Studies Programmes » organized at secondary school level, perceived by athletes and their classmates
Cloes, Marc ULg; Schelings, Virginie; Ledent, Maryse et al

in Gomez, Varera; Gonzalez, Valeiro; Sanchez, Molina (Eds.) Preparacion professional y necesidades socials (Educacion fisica, deporte, ocio, tercera edad, salud...). Proceedings of the AIESEP International Congress (2004)

In many sports, top level athletes have experienced years of hard practice. Training must be intensive and abide to high quality criteria. Today, promising teenagers are enrolled in sport programmes ... [more ▼]

In many sports, top level athletes have experienced years of hard practice. Training must be intensive and abide to high quality criteria. Today, promising teenagers are enrolled in sport programmes. However, the success of sport careers is so hazardous that it is necessary to guarantee the best school preparation to youths following their way to top level sport ... [less ▲]

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See detailAnimal performance and nitrogen surplus in suckler cows pastures fertilised with mineral nitrogen fertilizer, pig slurry or cattle compost
Dufrasne, Isabelle ULg; Cabaraux, Jean-François ULg; Hornick, Jean-Luc ULg et al

in Land use systems in grassland dominated regions, Book of abstracts of 20th General Meeting of the European Grassland Federation (2004)

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See detailLes paramyxovirus des mammifères marins
Jauniaux, Thierry ULg

in proceeding of the conference (2004)

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See detailReprésentations des réseaux de mots associés
Lejeune, Christophe ULg

in Purnelle, Gérald; Fairon, Cédrick; Dister, Anne (Eds.) Le poids des mots (2004)

Networks of associated words are used in qualitative data analysis software such as Candide, Réseau-Lu T-Lab on one side and Prospéro on the other side. The precise algorithm of both Candide and Prospéro ... [more ▼]

Networks of associated words are used in qualitative data analysis software such as Candide, Réseau-Lu T-Lab on one side and Prospéro on the other side. The precise algorithm of both Candide and Prospéro is described. Strength and limits of such a feature are compared with the gain it provides to social scientists. The paper concludes on a procedure helping to judge the adequacy and accuracy of categories of analysis constructed by the researcher. [less ▲]

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See detailIntrogression in tetraploid cotton of the resistance to reniform nematode Rotylenchulus reniformis Lind. & Oliveira from the Gossypium hirsutum L. x G. longicalyx Hutch & Lee x G. thurberi Tod trispecific hybrid
Konan, N'Guessan ULg; Ruano, O.; Prud'Homme, S. et al

in World Cotton Research Conference - 3. Cotton production for the new Millenium (2004)

In order to develop upland cotton plants resistant to Rotylenchulus reniformis Lind. & Oliveira reniform nematode, a three-species hybrids including Gossypium hirsutum L. (2n = 4 x = 52, (AD)1 genome) was ... [more ▼]

In order to develop upland cotton plants resistant to Rotylenchulus reniformis Lind. & Oliveira reniform nematode, a three-species hybrids including Gossypium hirsutum L. (2n = 4 x = 52, (AD)1 genome) was created using G. longicalyx Hutch & Lee as donor parent (2n = 2x = 26, F1 genome) and G. thurberi Tod. (2n = 2x = 26, D1 genome) as bridge species. The morphology and the resistance to reniform nematode of the parents and of thirty plants belonging to the selfed progeny of G. hirsutum x G. longicalyx x G. thurberi (HLT) trispecific hybrid were assessed. G. longicalyx, G. hirsutum x G. longicalyx hexaploid and all the thirty plants issued from the selfing of HLT hybrid were very resistant to reniform nematode unlike G. hirsutum which was very sensitive to it. Cytogenetic studies showed that HLT hybrid and its direct progeny have 52 chromosomes as the main cotton cultivated species. HLT hybrid shows a good pollen fertility and a very high level of chromosome pairing at metaphase I. It is self fertile but presents important incompatibility barriers when crossed as female parent with G. hirsutum. The prospects to develop upland cotton commercial cultivars resistant to reniform nématodes from the available interspecific genetic stocks are discussed. [less ▲]

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See detailEsQUIsE-SMA : Un système multi-agents pour l'interprétation d'esquisses architecturales
Juchmes, Roland ULg; Leclercq, Pierre ULg; Azar, Sleiman

in Actes de la 16ème conférence francophone sur l’interaction homme-machine (IHM’04) (2004)

Architects use freehand sketches in the initial stages of their design work because they prove to be the best adapted media for handling and expressing their preliminary ideas. Therefore, to help ... [more ▼]

Architects use freehand sketches in the initial stages of their design work because they prove to be the best adapted media for handling and expressing their preliminary ideas. Therefore, to help designers in their inventive work, a means for inputting and interpreting their sketches was needed.We propose a multi-agent approach to attain that goal. In this paper, we describe the operations of a multi-agent system for the on-line recognition of sketches. This system is currently integrated into the EsQUIsE prototype, a demo program for inputting, analysing and interpreting architectural design sketches. [less ▲]

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See detailPregnancy-associated glycoproteins (PAG) in postpartum cows, ewes, goats and their offspring
Haugejorden, G.; Dahl, E.; Karlberg, K. et al

in Proceedings of the 15th International Congress on Animal Reproduction (2004)

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See detailEffect of fertilisation with selenium on plasma selenium in Belgian Blue suckling cows and heifers: first results
Dufrasne, Isabelle ULg; Cabaraux, Jean-François ULg; Coenen, M. et al

in Land use systems in grassland dominated regions, Book of abstracts of 20th General Meeting of the European Grassland Federation (2004)

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See detailDesign and simulation of a Mechanical Amplifier for Inertial Sensing Applications
Kham, MN; Houlihan, R; Kraft, Michael ULg

in Proc. 6th Conf. on Modeling and Simulation of Microsystems (2004)

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See detailWhither dynamic congestion management ?
Wehenkel, Louis ULg

(2004)

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See detailDerivation of the rotational frequency of massive stars from seismic studies
Aerts, C.; Scuflaire, Richard ULg; Thoul, Anne ULg

in Stellar Rotation. 215 (2004)

In this contribution we review the current status of the determination of the rotational frequency in non-radially pulsating B stars, i.e. beta Cep stars and slowly pulsating B stars. Considerable ... [more ▼]

In this contribution we review the current status of the determination of the rotational frequency in non-radially pulsating B stars, i.e. beta Cep stars and slowly pulsating B stars. Considerable progress is currently being made in the understanding of the non-radial oscillations of main-sequence B Stars by means of high-temporal, high-spatial resolution spectroscopic time series. This has led to the detection of frequency multiplets, which are interpreted as rotationally splitted non-radial modes and which allow an accurate determination of the surface rotational frequency in some stars. We outline how our future goal, i.e. the derivation of the internal rotation frequency, can be achieved. [less ▲]

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See detailPreventive vs. emergency control of power systems
Wehenkel, Louis ULg; Pavella, Mania ULg

(2004)

A general approach to real-time transient stability control is described, yielding various complementary techniques: pure preventive, open loop emergency, and closed loop emergency controls. The ... [more ▼]

A general approach to real-time transient stability control is described, yielding various complementary techniques: pure preventive, open loop emergency, and closed loop emergency controls. The organization of the resulting control schemes is then revisited in order to make it able to cover static and voltage security, in addition to transient stability. Distinct approaches for preventive and emergency operating conditions are advocated. [less ▲]

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See detailHydro-mechanical numerical modelling of geotechnical problems using local second gradient models
Chambon, René; Collin, Frédéric ULg

in Vermeer, Peter; Ehlers, W.; Herrmann, H. J. (Eds.) Modelling of cohesive-Frictional Materials (2004)

The paper presents some applications of a local second gradient theory used to describe the mechanical behavior of a continua. This theory has been developed in order to avoid some well known drawbacks of ... [more ▼]

The paper presents some applications of a local second gradient theory used to describe the mechanical behavior of a continua. This theory has been developed in order to avoid some well known drawbacks of classical theories, when softening and/or localization occur in a computation. This theory is extended and then applied in a hydromechanical coupled problem, in the case of fully saturated geomaterials. The corresponding finite element method taking into account the geometrical non linearities is detailed. Preliminary results using the finite element code developed in this context are then discussed and allow to study post localization behavior. [less ▲]

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See detailUne approche statistique de la concurrence entre démonstratifs chez les historiens latins (César, Salluste, Tacite)
Longrée, Dominique ULg

in Bodelot, Colette (Ed.) Anaphore, cataphore et corrélation en latin, Actes de la Journée d'étude de Linguistique latine, Université Blaise Pascal - Clermont-Ferrand 2, 7 janvier 2003 (2004)

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See detailMaintien et stratégies de renforcement de la motivation des étudiants dans l'enseignement à distance
Mignon, Jacques ULg; Closset, Jean-Louis ULg

in Actes du 21e congrès de l’Association internationale de pédagogie universitaire (AIPU) (2004)

L'exploitation des nouvelles technologies dans la mise sur pied d'un enseignement à distance s'accompagne nécessairement d'une réflexion pédagogique structurée. Cette réflexion fait souvent fi de la mise ... [more ▼]

L'exploitation des nouvelles technologies dans la mise sur pied d'un enseignement à distance s'accompagne nécessairement d'une réflexion pédagogique structurée. Cette réflexion fait souvent fi de la mise en oeuvre de véritables stratégies motivationnelles. Pourtant, lorsqu'on demande à un enseignant pourquoi il souhaite mettre un cours en ligne, il invoque souvent le fait de chercher à motiver ses étudiants. Nous distinguerons ici le maintien de la motivation, du renforcement de la motivation des étudiants. Les risques de démotivation et d'abandon sont très nombreux dans l'enseignement à distance, même avec le soutien des nouvelles technologies. Il est donc essentiel de veiller à maintenir constamment la motivation initiale de l'apprenant. Si le maintien de cette motivation fait appel à des moyens, des trucs, des recettes de tutorat, il n'en va pas de même du renforcement de la motivation. En effet, il s'agit ici de mettre au point, dès la phase de conception du cours, de véritables stratégies motivationnelles. Quels sont les risques de démotivation des étudiants ? Comment les éviter ? Quelles bases théoriques peuvent nous guider dans notre mise au point des stratégies motivationnelles ? Quelles pistes motivationnelles le concepteur peut-il emprunter, et dans quelles perspectives ? Sur base des théories de la motivation, notre recension des données bibliographiques vise à préciser les questions que doivent se poser les concepteurs de cours à distance. De même, elle débouche, pour chaque question, sur des pistes concrètes à explorer. [less ▲]

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See detailAn immunohistochemical study of canine nasal aspergillosis.
Peeters, Dominique ULg; day, M. J.; Moore, Peter et al

in Proceedings of The 14th Annual Congress of the ECVIM-CA (2004)

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See detailL'ouverture des écoles de musique à un nombre croissant d'élèves et les transformations de l'enseignement musical en Communauté française de Belgique
Giot, Bernadette ULg; Baye, Ariane ULg

in Evaluation entre équité et efficacité : actes du XVIe colloque international de l'Admée-Europe, Liège, 4-6 septembre 2003 (2004)

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See detailMeteor excitation and meteoroid abundances from quantitative spectroscopy
Jenniskens, P.; Laux, C. O.; Jehin, Emmanuel ULg

in 35th COSPAR Scientific Assembly (2004)

Meteor spectroscopy provides both quantitative data on the excitation conditions in the meteor plasma, the progressive ablation of mineral species in the meteoroid, and the meteoroid's elemental ... [more ▼]

Meteor spectroscopy provides both quantitative data on the excitation conditions in the meteor plasma, the progressive ablation of mineral species in the meteoroid, and the meteoroid's elemental abundances for selected elements. The recent NASA and USAF sponsored Leonid Multi-Instrument Aircraft Campaign provided high-resolution spectra of relatively faint meteors using a slit-less cooled CCD spectrograph. Additional observations from ground and space extended the wavelength range from 250 to 1050 nm. We have measured excitation conditions in the meteor plasma from studies of meteoric air plasma emissions (N_2, N, O, O_2) and ablated metal atom line emissions (Fe). Results were compared to laboratory calibrated air plasma emission models and LTE models of metal atom line emissions. Further insight was provided by a spectrum recorded serendipitously at the European Southern Observatory VLT telescope, which provides the first spectral information over a cross-section of a meteor trail. We also searched for emissions from CN, H, and OH that may be ablation products of organic matter and mineral water contained in the meteoroid. We will present an overview of the information gathered to date and discuss the meteoric metal atom abundances (Fe, Mg, Si, Na, Ca, Mn, Al, Ni, Ti, Sc, Cr, Co, and V) measured for representative meteoroids. [less ▲]

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See detailAn investigation on the use of GBT for the study of profiles with branched cross section
Degée, Hervé ULg; Boissonnade, N.

in Proceedings of the Fourth International Conferences on Coupled Instabilities in Metal Structures (2004)

This paper presents a formulation allowing the application of generalised beam theory (GBT) to the analysis of thin-walled members with branched open cross section. It is then applied to a simple example ... [more ▼]

This paper presents a formulation allowing the application of generalised beam theory (GBT) to the analysis of thin-walled members with branched open cross section. It is then applied to a simple example and compared with results obtained by the use of classical FE-models (beam elements or shell elements). [less ▲]

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See detailTemps verbaux, axe syntagmatique, topologie textuelle : analyses d'un corpus lemmatisé
Longrée, Dominique ULg; Mellet, Sylvie; Luong, Xuan

in Dister, Anne; Purnelle, Gérald; Fairon, Cédric (Eds.) Le poids de mots, Actes des 7e Journées internationales d'Analyse statistique des données textuelles, Louvain-la-Neuve, 10-12 mars 2004 (2004)

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See detailSoil variability measured by a soil strenght sensor: within-field variability and similarity between fields
Hanquet, Bernard; Ndao, Tanor; Verbrugge, Jean-Claude et al

in Book of Abstracts (2004)

Many sensing methods for soil physical properties determination are developed to replace time-consuming and expensive soil sampling and analysis. Within this scope, sensors to measure soil strength are ... [more ▼]

Many sensing methods for soil physical properties determination are developed to replace time-consuming and expensive soil sampling and analysis. Within this scope, sensors to measure soil strength are developed in several laboratories. They are generally coupled to DGPS positioning systems to produce maps, showing within-field soil variability. In this study, besides the within-field variability, the sensor was used with another objective: the aim was to appraise the similarity of soil strength between different fields located in silty areas, in Belgium. [less ▲]

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See detailComputation of the Malpasset dam break with a 2D conservative flow solver on a multiblock structured grid
Erpicum, Sébastien ULg; Archambeau, Pierre ULg; Dewals, Benjamin ULg et al

in Proceedings of the 6th International Conference of Hydroinformatics (2004)

In the global framework of safety, the study of the hydraulic consequences of a dam breaking, sudden and instantaneous for concrete structures, gradual for earth ones, is of major interest in the scope of ... [more ▼]

In the global framework of safety, the study of the hydraulic consequences of a dam breaking, sudden and instantaneous for concrete structures, gradual for earth ones, is of major interest in the scope of prevention policies or protection plans for populations and goods. Suitable numerical models, coupled with contemporary computational possibilities, allow engineers to forecast these complex situations with a great reliability. In this field, WOLF 2D is an efficient analysis and optimisation tool, which has been completely developed by the Applied Hydrodynamics and Hydraulic Constructions team (HACH – http://www.ulg.ac.be/hach) of the University of Liege. It is part of WOLF free surface flows computation package, which includes in the same development environment the resolutions of the 1D Saint-Venant equations, the 2D shallow-water equations as well as a physically based hydrological model and powerful optimisation capabilities based on Genetic Algorithms. The interactive and unique user-interface, with high performance pre- and post-processing, allows monitoring 3-D large-scale runs graphically while they proceed, as well as generation of 3D videos. Each code handles general multiblock meshes, dealing with natural topography and mobile bed simultaneously, for any unsteady situation with mixed regimes and moving hydraulic jumps. By this way, WOLF deals with all free surface hydraulic phenomena, from hydrological runoff and river propagation to extreme erosive flows on realistic mobile topography, such as gradual dam breaching processes. It has moreover proved its efficiency and reliability for years by numerous real applications. The first part of this paper covers a brief description of the 2D multiblock flow solver WOLF 2D and the underlying mathematical model. The second part depicts the application of WOLF computation capabilities to the well-known Malpasset dam break (France, 1959), which induced a catastrophic almost instantaneous release of 48 millions m³ of water in the Reyran river valley down to the town of Frejus and the Mediterranean sea. Data available thanks to the CADAM EU-project are used to assess the results. [less ▲]

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See detailStructural optimisation of steel frames for industrial applications
Mathonet, V.; Degée, Hervé ULg; Habraken, Anne ULg et al

in Proceedings of the Inverse Problems Design and Optimization Symposium (2004)

The paper reports the first results of a work carried out in close collaboration between Astron Buildings SA, a manufacturer of industrial steel buildings, and different groups of civil engineers and ... [more ▼]

The paper reports the first results of a work carried out in close collaboration between Astron Buildings SA, a manufacturer of industrial steel buildings, and different groups of civil engineers and mathematicians of the University of Liège to develop an automatic design method for structures with tapered members. This research aims at improving the current method of trialerror followed by experienced engineers to optimize the frames constrained by a chosen national construction code and the technological constraints of the producer. The main benefit of this collaboration arises through the application of a mathematical algorithm based on the sequential quadratic programming method (SQP) in order to reduce, in the first step, the weight of the building, under the great number of constraints. The second step, not yet started, will be devoted to the minimization of the real cost of the frame. This report introduces the first results of this industrial application. [less ▲]

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See detailMarket dynamics driven by the decision-making power producers
Ernst, Damien ULg; Minoia, Anna; Marija, Ilic

in Proceedings of 2004 IREP Symposium - Bulk Power System Dynamics and Control - VI (2004)

In this paper we consider a tool for analyzing the market outcomes when competitive agents (power producers) interact through the market place. The market clearing mechanism is based on the locational ... [more ▼]

In this paper we consider a tool for analyzing the market outcomes when competitive agents (power producers) interact through the market place. The market clearing mechanism is based on the locational marginal price scheme. A model of the strategic behavior is formulated for the agents. Each agent chooses its bid in order to maximize its profit by assuming that the other agents will post the same bid as at the previous session of the market, and by knowing the network characteristics. The income of each agent over a certain temporal horizon for different power system configurations (the addition of new transmission capabilities, new power plants) is evaluated according to this market dynamics and by integrating this dynamics over the chosen temporal horizon. The mathematical formulation, for the sake of simplicity, is related to a two node power system. In the simulations, the influence of different conditions (line transfer capacity, the number and size of generators, the presence of portfolio) on market outcomes is analyzed, and interesting and sometimes counterintuitive results are found. [less ▲]

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See detailFast 3D finite element - boundary element analysis of induction heaters with passive and active shielding
V Sabariego, Ruth ULg; Sergeant, Peter; Gyselinck, Johan et al

in Proceedings of Progress in Electromagnetics Research Symposium (PIERS2004) (2004)

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See detailBootstrap Equations for String-Like Amplitude
Semenov-Tyan-Shanskiy, Kirill ULg

in Dubinin, M.; Savrin, V. (Eds.) High energy physics and quantum field theory. Proceedings, 18th International Workshop, QFTHEP 2004, St. Petersburg, Russia, June 17-23, 2004 (2004)

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See detailLa Femme et le cloître à l’époque moderne. Bilan historiographique et perspectives de recherches
Henneau, Marie-Elisabeth ULg

in Leduc, Guyonne (Ed.) Nouvelles sources et nouvelles méthodologies de recherche dans les études sur les femmes (2004)

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See detailL'octréotide LP dans le traitement des ophtalmopathies basedowiennes incipiens : Evaluation prospective VS placebo
Wemeau, J. L.; Caron, P.; Rohmer, V. et al

in XXIème Congrès de la Société Française d'Endocrinologie - Abstract book (2004)

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See detailL’architecture comme représentation de la justice pénale
Tieleman, David ULg

in GAMBARDELLA, Carmine; MARTUSCIELLO, Sabina (Eds.) Le Vie deai Mercanti : rappresentazione come governo della modificazione (2004)

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See detailCritical state modelling of crossed field demagnetisation in HTS materials
Swartz, J. P.; Mc Culloch, M. D.; Pecher, R. et al

in Andreone, A.; Pepe, G. P.; Cristiano, R. (Eds.) et al Applied Superconductivity 2003 (Proceedings of the 6th European Conference on Applied Superconductivity) (2004)

Large magnetic fields can be trapped in high temperature superconductor material, enabling their use as permanent magnets in various applications. It has, however, been observed that these materials ... [more ▼]

Large magnetic fields can be trapped in high temperature superconductor material, enabling their use as permanent magnets in various applications. It has, however, been observed that these materials experience a decay in magnetisation when a field is applied in a direction transverse to the trapped field. This paper presents the results of critical state modelling of an infinite slab of superconductor that is first fully magnetised and then exposed to magnetic field in the transverse direction. The bean and double critical state model are implemented and the results compared to each other and to that of physical experiment. The convergence of the decay is investigated as well as the effect of the magnitude of the crossed field on the final decay value. Diamagnetic and paramagnetic initial conditions are applied to the material and the results used to compare the accuracy of the bean and double critical state model. [less ▲]

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See detailMolecular monitoring of the introgression in Gossypium hirsutum L. of G. sturtanium Willis genes controlling the "glanded-plant and glandless-seed" trait
Benbouza, H.; Lacape, M.; Jacquemin, J. M. et al

in World Cotton Research Conference - 3. Cotton production for the new Millenium (2004)

One hundred mapped micro-satellites markers located on the chromosomes of subgenome Ah were used to monitor the introgression of DNA fragments coming from the Australian species G. sturtianum Willis in ... [more ▼]

One hundred mapped micro-satellites markers located on the chromosomes of subgenome Ah were used to monitor the introgression of DNA fragments coming from the Australian species G. sturtianum Willis in BC1, BC2, BC2S1, BC2S2, BC2S3, BC3, BC3S1 and BC3S2 obtained from the G. hirsutum L. x G. raimondii Ulb. x G. sturtianum (HRS) trispecific hybrid. In these plants, the inhibition of the gossypol synthesis only in the seed seems to be linked to the substitution of fragments of linkage groups C2, C3, C4, C5, C6, C7 and C9 of G. hirsutum by homeologous segments of G. sturtianum chromosomes. The prospect to use these genetic stocks to develop commercial varieties is discussed according to the putative genetic determinism of the “low-gossypol seed and high-gossypol plant”-trait. [less ▲]

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See detailSolute contaminant transport in variably saturated dual-porosity/ dual permeability chalk: field tracer experiments and modelling
Brouyère, Serge ULg

in Aagaard, Per; Bedbur, Eckart; Bidoglio, Giovanni (Eds.) et al Saturated & unsaturated zone: integration of process knowledge into effective models - COST Action 629 Workshop (2004)

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See detailPeinture et publicité
Duchesne, Jean-Patrick ULg

in Actes de la 1ère journée interuniversitaire des didactiques d’histoire de l’art: Enseigner l’histoire de l’art. Un art et une histoire tournés vers le futur (2004)

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See detailIsolation and characterisation of seven alien monosomic addition lines of Gossypium australe F. Muell. on G. hirsutum L.
Ahoton, L.; Lacape, J. M.; D'Hont, A. et al

in World Cotton Research Conference - 3. Cotton production for the new Millenium (2004)

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See detailUsing the Complete Nano Engineering Geological Spectrum to Assess the Performance of Clay Barriers
Schmitz, Robrecht; Schroeder, Christian ULg; Thorez, Jacques ULg et al

in Hack, Robert; Azzam, Rafig; Charlier, Robert (Eds.) Engineering Geology for Infrastructure Planning in Europe (2004)

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See detailMotivation in the Gym: A Qualitative Approach
Cloes, Marc ULg

in Chin, M. K.; Hensley, L. D.; Cote, P. (Eds.) et al Global Perspectives in the Integration of Physical Activity, Sports, Dance, and Exercise Science in Physical Education: From Theory to Practice (2004)

Students’ motivation is a major concern of physical education teachers as well as it interest the others educators. Understanding of that complex variable increased during the last two decades. In the ... [more ▼]

Students’ motivation is a major concern of physical education teachers as well as it interest the others educators. Understanding of that complex variable increased during the last two decades. In the physical education domain, many studies were focused on isolated variables related to motivation and on their relationship with pupils’ behaviours. More recently, qualitative researches were conducted to enter in the class specificity and to integrate the complexity and diversity of the variables that influence students’ motivations. Combining questionnaires interviews and observation, some researchers have confirmed that student’s motivation depends on a package of dispositional as well as individual and collective situational factors. They pointed out also the determining role of the teacher in the development of a motivated class climate. This paper will describe a couple of qualitative studies designed to analyse students’ motivation and will underline their contribution in the understanding of the phenomena related to the development of motivation by students. Moreover, as teachers need research directly focused to their concerns, we must now provide them more support helping them to apply research data. The action research design is proposed as an appropriate approach in that way. The description of a pilot action research focused on the improvement of the students’ motivation in a secondary school level girls class will also proposed. The main results should provide the starting point of a reflective process about the strategies that teachers could plan on the gym. As it has been underlined above, the goal of the paper was to share useful information with practitioners and researchers and to encourage them to involve themselves in personal research on students’ motivation. [less ▲]

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See detailSimplification of milk recording in dairy cattle for low input systems.
Hammami, Hedi ULg; Romdhani, Sonia Bedhiaf; Djemali, M'naouer et al

in Guellouz, Mustapha; Dimitriadou, Andie; Mosconi, Cesare (Eds.) Performance recording of animals. State of the art, 2004 (2004)

The simplification of recording procedures constitutes an economic alternative to reduce operational costs when national recording programs are concerned in low input production systems. A total of 54 940 ... [more ▼]

The simplification of recording procedures constitutes an economic alternative to reduce operational costs when national recording programs are concerned in low input production systems. A total of 54 940 daily milk yields from a herd of 63 Holstein cows recorded in 3 years were used in this study. The effect of reducing tests to measure the accuracy of 305 milk yields was investigated. Two methods of total milk yield computation (the Test Interval Method (TIM) and the Interpolation using Standard Lactation Curves (ISLC)) were compared based on 495 combinations of milk recording alternatives. These alternatives were based on 2 milkings/day, one alternated milking (AM/PM) and one non-alternated milking (AM or PM). All of them were used with 9 intervals between consecutive tests (3 to 11 weeks) and 11 intervals between calving date and the first test day. Results showed that the differences between the actual 305 d milk yield and milk estimated by TIM were the smallest on consecutive test days of maximum 6 weeks of intervals. Differences increased in both sides positively back to A3 and negatively toward A11. Standard estimation errors increased from 4 to 9 from A3 to A11. Phenotypic correlations decreased from .99 to .94 when intervals between the calving date and the first test day increased and this for all test methods (A3-A 11). The ISLC led to a better accuracy of milk yield estimation when intervals between consecutive tests got longer. [less ▲]

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See detailIntraplate deformations measured using an absolute gravimeter across the Ardenne and the Roer Graben (North-Western Europe)
Van Camp, Michel; Camelbeek, Thierry; Warnant, René ULg

in Meurers, B.; Pail, R. (Eds.) Proceedings of the 1st Workshop on International Gravity Field Research (2004)

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See detailExtended Thermodynamic Description of Thermodiffusive Mass Transport
Lebon, Georgy ULg; Desaive, Thomas ULg; Dauby, Pierre ULg et al

in Proc. 6 th Int. Meeting on Thermodiffusion (IMT6), Varenna, July 2004 (2004)

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See detailCour d'arbitrage et droit judiciaire privé
Abu Dalu, Firass ULg

in La Cour d'arbitrage: un juge comme les autres? (2004)

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See detailAn unified extended thermodynamic description of diffusion, thermodiffusion, suspensions and porous media
Lebon, Georgy ULg; Desaive, Thomas ULg; Dauby, Pierre ULg

in Proceedings International Conference on thermal engineering theory and application, Beirut (Liban), 2004 (2004)

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See detailMelting and crystallisation behaviour of multi-component Fe-C-Cr-X alloys : microstructural aspects
Tchuindjang, Jérôme Tchoufack ULg; Lecomte-Beckers, Jacqueline ULg

in Proceedings of the 13th European Microscopy Congress (2004)

Studied materials are of the Fe-C-Cr-X multi-component system where X represents a group of strong carbides formers as Mo, V, or Nb. These alloys are used for wear components. Differential Thermal ... [more ▼]

Studied materials are of the Fe-C-Cr-X multi-component system where X represents a group of strong carbides formers as Mo, V, or Nb. These alloys are used for wear components. Differential Thermal Analysis (DTA) was used to determine the melting and solidification behaviour of these materials. Raw material has a thermomecanical history that involved casting, heat treating and hot forming, which could be investigated by the melting sequence of the DTA trial. [less ▲]

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See detailL'appropriation de l'évaluation par la formalisation des critères de jugement
Vandoorne, Chantal ULg; Grignard, Sophie ULg

in Ouvrage des résumés du Congrès des 1-2 et 3 juillet 2004 à Lyon de la Société Française de Santé Publique (2004)

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See detailEffects of atmospheric turbulence on the GENIE nulling interferometer
Absil, Olivier ULg

in Aime, Claude; Soummer, Rémi (Eds.) Astronomy with High Contrast Imaging II (2004)

Two competitive design studies for the Ground-based European Nulling Interferometer Experiment (GENIE) have recently been initiated by the European Space Agency and the European Southern Observatory. A ... [more ▼]

Two competitive design studies for the Ground-based European Nulling Interferometer Experiment (GENIE) have recently been initiated by the European Space Agency and the European Southern Observatory. A major issue in these studies is the influence of atmospheric turbulence on the performance of the instrument, and how atmospheric effects can be compensated in order to reach the goal performance (detection of faint exozodiacal clouds). In this paper, we review the main atmospheric processes affecting a nulling interferometer and discuss possible ways to reduce them by means of real-time control systems. Preliminary performance estimates of GENIE are then presented. The effects of the thermal background and its fluctuations (Absil & Bakker 2004) are not considered here. [less ▲]

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See detailStructural damage detection based on PCA of vibration measurements
Golinval, Jean-Claude ULg; De Boe, Pascal; Yan, A. M. et al

in 58th Meeting of the Soc. for Mach. Failure Prevention Tech, Virginia Beach, 2004 (2004)

This paper deals with the application of statistical process control techniques based on principal component analysis to vibration-based damage diagnosis of structures. Principal component analysis of the ... [more ▼]

This paper deals with the application of statistical process control techniques based on principal component analysis to vibration-based damage diagnosis of structures. Principal component analysis of the sensor time-responses allows to extract principal directions (i.e. features) which define a subspace that is representative of the dynamics of the instrumented structure. Any change in the response of a single sensor will affect the subspace spanned by the complete sensor response set. It follows that the subspace corresponding to the current state of the structure can be compared to the subspace of the initial state of the structure, assumed to be healthy, in order to diagnose possible damage. Principal component analysis may also be performed for every potential subset of damaged sensors in order to identify the involved sensor, and, therefore, the damaged substructure. In this paper, the problem of structural damage detection is addressed in the case of environmental vibration testing. A direct application is presented for a test item submitted to random vibration testing by means of an electro-dynamic shaker. [less ▲]

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See detailExperimental characterization of hafting traces and their recognition in archaeological assemblages
Rots, Veerle ULg; Vermeersch, Pierre M.

in Walker, E. A.; Wenban-Smith, F.; Healy, F. (Eds.) Lithics in Action. Papers from the Conference Lithic Studies in the Year 2000 (2004)

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See detailSystèmes de croyance Niomankas et gestion des ressources naturelles de mangroves
Cisse, T.; Ghysels, A.; Vermeulen, Cédric ULg

in De Dapper, M. (Ed.) Tropical forests in a changing global context (2004)

Le concept de «savoirs endogènes» constitue actuellement l’un des axes majeurs de la réflexion autour de la problématique de la conservation de la biodiversité. En effet, on se rend de plus en plus compte ... [more ▼]

Le concept de «savoirs endogènes» constitue actuellement l’un des axes majeurs de la réflexion autour de la problématique de la conservation de la biodiversité. En effet, on se rend de plus en plus compte que l’activité de conservation de la diversité biologique, qui met à contribution les organisations locales, les structures étatiques et les ONG environnementales, ne peut pas seulement s’appuyer sur les connaissances scientifiques. La réflexion autour des savoirs écologiques locaux (Technical Ecological Knowledge [TEK]), et leur valorisation, apparaît comme une solution pour une gestion durable et viable des écosystèmes marins et côtiers, en particulier pour les forêts de mangrove du Siné-Saloum. Au Sénégal, l’ensemble du littoral subit depuis plusieurs décennies les effets de la désertification. Les initiatives se multiplient dans la Réserve de la Biosphère du Delta du Saloum [1]*** (RBDS) pour réhabiliter les écosystèmes côtiers. Il serait intéressant de voir quels peuvent être les apports des savoirs locaux, ceux des Niominka et Socé, dans la dynamique globale de conservation de la biodiversité écologique. Au moment où des plans de gestion de la mangrove [2] sont en train d’être conçus, il serait bon d’intégrer les savoirs écologiques endogènes dans le processus de leur conception et de mise en œuvre. En effet, dans le jeu des interactions entre communautés locales et ONG, donc intervenants extérieurs, il peut arriver que des réactions de rejet se manifestent. S’il en est ainsi, c’est parce que les ONG sont parfois porteuses d’initiatives qui ne tiennent pas compte des manières de penser, des rapports qui lient la nature aux populations autochtones, des systèmes de conception, de représentation et d’occupation de l’espace ou d’appropriation des ressources. Chez les Niominkas du Siné-Saloum, il existe des croyances et perceptions qui ont eu un impact positif sur la protection de l’environnement. Selon l’anthropologue sénégalais Massaer Diallo [3], «si ce que l’on appelle aujourd’hui “le respect de l’environnement” et la “gestion durable des ressources naturelles” a des cas équivalents dans des cultures et sociétés dites traditionnelles (régies par des logiques endogènes et anciennes), c’est parce que ces dernières étaient fondées sur une conception, des règles et valeurs qui impliquaient voire édictaient un rapport harmonieux ou équilibré avec la nature (physique, animale et végétale)». En voici quelques illustrations. La sacralisation de Jiffa, Péthiamak, chez les Sérères de Djilor, fait que ces sites — même si ce n’était pas l’objectif recherché — sont aujourd’hui les moins agressés dans la communauté rurale [4]. L’injonction du génie protecteur du Loog, Laga ndong, de ne parler que le sérère dans la zone de pêche Niamokine — dans un pays où l’écrasante majorité parle wolof — a favorisé le contrôle du bolong par les Niominkas et la limitation de l’exploitation de ses ressources aux autochtones. De plus, l’islamisation des sociétés traditionnelles sérères a introduit un rapport de type nouveau entre l’homme et la nature parce que le fait de couper un arbre ou tout simplement des feuilles d’arbres sans en avoir besoin est associé à un péché. Celui qui abuse de la ressource végétale est selon le Coran un pécheur. En planter, c’est attirer la miséricorde divine sur soi, dit-on dans le texte sacré des musulmans. Ces représentations religieuses ont donc des incidences sur l’équilibre de la nature. Les savoirs écologiques locaux présentent un intérêt bien particulier mais il faut se garder de faire de l’ethnologisme. Et puis, il y a chez les Niominka une forte croyance selon laquelle la mangrove est un don de Dieu. Par conséquent, la pérennité des ressources qu’elle génère est garantie par une divinité. Quelle est la place de ces croyances dans le processus de désintégration des forêts de mangrove dans le Siné et le Saloum? Le présent article tente de fournir des éléments d’appréciation sur la place des savoirs locaux dans la conservation de la diversité biologique chez les communautés Niominka de la RBDS. [less ▲]

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See detailRenormalization programme for effective theories
Vereshagin, Vladimir; Semenov-Tyan-Shanskiy, Kirill ULg; Vereshagin, Alexander

in Lipatov, L.; Kim, V. (Eds.) Proceedings of First International Workshop, Hadron Structure and QCD, from low to high energies, Repino, St. Petersburg, Russia, 18-22 May 2004 (2004)

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See detailValidation of a shell finite element for concrete and steel structures subjected to fire
Talamona, Didier; Lim, Linus; Franssen, Jean-Marc ULg

in Bradley, Derek; Drysdale, Dougal; Molkov, Vladimir (Eds.) Proceedings of the 4th International Seminar "Fire and Explosion Hazards" (2004)

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See detailOn the determination of local buckling modes for the design of thin walled members
Rossi, Barbara ULg; Rondal, Jacques ULg

in International Conference on Coupled instabilities in metal structures: CIMS2004, Rome 27-29 September 2004 (2004)

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See detailEffects of a micro hydroelectric power plant upon population abundance, mobility and reproduction behaviour of European grayling T. thymallus and brown trout S. trutta in a salmonid river
Ovidio, Michaël ULg; Paquer, Frédéric ULg; Capra, Hervé et al

in Garcia de Jalon, Diego; Vizcaino Martinez, Pilar (Eds.) International Symposium on Ecohydraulics. Aquatic habitat: Analysis & Restoration (2004)

This study examines the potential effects of a new micro hydroelectric power plant (MHPP) on the behaviour (habitat use, movements) and population abundance of European grayling (T. thymallus) and brown ... [more ▼]

This study examines the potential effects of a new micro hydroelectric power plant (MHPP) on the behaviour (habitat use, movements) and population abundance of European grayling (T. thymallus) and brown trout (S. trutta) in the Lhomme (Belgian Ardennes). Thirteen grayling and five brown trout were captured before their spawning period and were manually radio-tracked up to 6 times a week. Population density and biomass were estimated into two different sampling sectors with electric fishing, before and after the MHPP started up. The mobility patterns of grayling and trout in the reach of the river Lhomme influenced by the MHPP strongly contrasted with results obtained in an undisturbed river of the same type in the Belgian Ardennes. Movements were mostly restricted and rarely increased during the spawning period. Spawning took place, but was disturbed by hydropeakings. The population biomass of grayling and trout decreased by 61 % and 23 % respectively, five months after the start-up of the MHPP exploitation. [less ▲]

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See detailEtude de la consolidation du béton frais sur base de la porosité à l'état durci
Willem; Darimont, Anne ULg; Degeimbre, Robert et al

in Courard, Luc (Ed.) Compte-rendu des Journées Scinetifiques du (RF)2B (2004)

La consolidation est le terme qui désigne la sédimentation des grains dans les suspensions très denses comme le béton. Le resserrement du squelette granulaire du béton frais entraîne une exsudation d’eau ... [more ▼]

La consolidation est le terme qui désigne la sédimentation des grains dans les suspensions très denses comme le béton. Le resserrement du squelette granulaire du béton frais entraîne une exsudation d’eau qui s’accumule à la surface de l’échantillon, formant la couche d’eau de ressuage. Cette migration de l’eau est à l’origine de nombreux défauts dans le béton qui mettent en péril sa durabilité. Le but de ce travail est de mettre en évidence l’existence d’une relation entre le ressuage et la porosité à l’état durci du béton. [less ▲]

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See detailEUREF Related Activities in Belgium
Bruyninx, Carine; Carpentier, Georges; Lejeune, Sandrine et al

in Torres, J.; Hornik, H. (Eds.) EUREF Publication No. 13 (2004)

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See detailDynamic approach of structural fire calculation with FEM software
Vassart, Olivier; Cajot, Louis-Guy; Franssen, Jean-Marc ULg et al

in Proc. 5th International Conference on Performance-Based Codes and Fire Safety Design Methods (2004)

This paper explains how the dynamic approach has been implemented in the computer software SAFIR in order to cope with temporary and local failures that occured in a step be step static analysis of ... [more ▼]

This paper explains how the dynamic approach has been implemented in the computer software SAFIR in order to cope with temporary and local failures that occured in a step be step static analysis of structures subjected to fire.By means of this recently implemented dynamic algorithm, it’s now possible to simulate the complete failure mechanism, to predict the influence of a local failure on the global behaviour of the structure and to follow eventually the progressive collapse. Therefore the resistance time is now really determined whereas in the past many numerical failure corresponding to local failure were interpreted as resistance time of the whole structure. [less ▲]

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See detailL'évolution législative et jurisprudentielle du régime des prestations familiales
Kefer, Fabienne ULg; Delooz, Sarah; Dumont, Chloé et al

in Actualité de la sécurité sociale - Evolution législative et jurisprudentielle (2004)

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See detailGlobal design of hydraulic structures optimised with physically based flow solvers on multiblock structured grids
Erpicum, Sébastien ULg; Dewals, Benjamin ULg; Archambeau, Pierre ULg et al

in Proceedings of the 9th International Symposium on River Sedimentation (2004)

This paper presents the numerical studies lead by the Laboratory of Applied Hydrodynamics and Hydraulic Constructions of the University of Liège (HACH) for the rehabilitation of the 21-meter high ... [more ▼]

This paper presents the numerical studies lead by the Laboratory of Applied Hydrodynamics and Hydraulic Constructions of the University of Liège (HACH) for the rehabilitation of the 21-meter high Nisramont dam in Belgium. After determination of the up-to-date 1000-year return flood using the hydrological runoff model WOLFHYDRO on the global 74,000 ha watershed real topography coupled with statistical analyzes, and after validation on the existing situation and for extreme observed events, the 2D finite volume multiblock flow solver WOLF2D has been applied to the design of the new stilling basin and to the bottom outlet rehabilitation impact study. The multiblock solver possibilities allow mesh refinement close to interesting areas, such as dam spillway and stilling pool, without leading to prohibitive CPU times, while suitable shallow water equations formulation allows the computation of the flows on the strongly vertically curved bottom of the spillway. In the described simulation, 270,000 structured finite volumes, from .25 to 1 meters long, are used to simulate as a whole the flows in the upstream reservoir, dam, spillway, stilling basin and downstream river, this on a real topography. [less ▲]

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See detailDe zinsaccentuering in het Nederlands: een verkenning over de grenzen tussen (toegepaste) taalkunde en didactiek heen
Rasier, Laurent ULg

in Gelderblom, A. (Ed.) Neerlandistiek de grenzen voorbij. Handelingen van het Vijftiende Colloquium Neerlandicum (2004)

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See detailPrise en charge multimodale de la chirurgie abdominale majeure
Kaba, Abdourahmane ULg; Joris, Jean ULg

in La réhabilitation post-opératoire (2004)

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See detailRecombination and somatic elimination of a Gossypium australe chromosome in G. hirsutum
Sarr, D.; Baudoin, Jean-Pierre ULg; Mergeai, Guy ULg

in Proceedings of the Beltwide cotton improvement conference (2004)

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See detailLearner Support in the Formasup degree: variety as a key feature and close coaching to drive innovation
Poumay, Marianne ULg

in Supporting the Learner in Distance Education and E-Learning (2004)

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See detailMetodologia documentaria e insegnamento a distanza (traduit du français par Massimo Borghese)
Pochet, Bernard ULg

in Lombello Soffiato, Donatella; Lo Brano, Ademario (Eds.) Inciampare nel problema. Il Processo di ricerca dell'informazione nella biblioteca scolastica multimediale (2004)

During this presentation, we will mainly describe the information literacy courses at the University of Gembloux in Belgium (FUSAGx) and its gradual transformation of from presential education to distance ... [more ▼]

During this presentation, we will mainly describe the information literacy courses at the University of Gembloux in Belgium (FUSAGx) and its gradual transformation of from presential education to distance learning. The process is far from over, but some lessons can already be drawn from this 3 years experience's. [less ▲]

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See detailDetection of moulds growing on building materials by gas sensor arrays and pattern recognition
Kuske, Martyna; Padilla, M.; Romain, Anne-Claude ULg et al

in Technical digest of eurosensors : proceedings (2004)

This work explores the detection of moulds growing in different building materials by using a metal oxide sensor array Four mould species have been considered. Pattern Classification provides ... [more ▼]

This work explores the detection of moulds growing in different building materials by using a metal oxide sensor array Four mould species have been considered. Pattern Classification provides classification rates on the order of 80-90% for different species. Drift degrades slightyl these values subsequent test four months later. [less ▲]

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See detailMusiques et littérature africaines-américaines
Sacré, Robert ULg

in Demeuldre, Michel (Ed.) Sentiments Doux-amers dans les Musiques du Monde . Délectations Moroses dans les blues, fado,tango, flamenco, rebetiko, p'ansori,ghazal,... (2004)

La tradition orale, la culture populaire et les musiques vocales pratiquées dans leurs communautés sont très présentes dans l'oeuvre des écrivains africains-américains en général et par exemple, dans " A ... [more ▼]

La tradition orale, la culture populaire et les musiques vocales pratiquées dans leurs communautés sont très présentes dans l'oeuvre des écrivains africains-américains en général et par exemple, dans " A Lesson before Dying" de Ernest GAINES. [less ▲]

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See detailApproche unifiée des interactions entre l'hydrodynamique et le milieu naturel ou construit: exemples d'applications expérimentales et numériques
Pirotton, Michel ULg; Archambeau, Pierre ULg; Erpicum, Sébastien ULg et al

in Actes des 5èmes journées scientifiques et techniques du CETMEF (2004)

Même si le contexte contemporain fait évoluer les problèmes qui y sont liés, force est de constater que les défis majeurs attachés à l’eau subsistent ou se radicalisent. De l'écrêtement des crues au ... [more ▼]

Même si le contexte contemporain fait évoluer les problèmes qui y sont liés, force est de constater que les défis majeurs attachés à l’eau subsistent ou se radicalisent. De l'écrêtement des crues au soutien d'étiage, du recours toujours croissant à l'eau pour l’activité industrielle au sens large au maintien de ses propriétés écologiques pour la consommation, tout concourt à faire du problème de l’eau un défi du 21e siècle, bien rare à épargner et à gérer plus efficacement. Qu'elle s'intéresse à l’origine, à la consommation ou à l’utilisation de l’eau ou encore qu'elle se tourne vers les conséquences possibles des infléchissements que l'homme peut provoquer sur le cycle de l’eau, la gestion actuelle des ressources hydrauliques ne peut plus ignorer les nouvelles potentialités nées de l'accroissement rapide des possibilités numériques qui permettent, avec les acquis théoriques en mécanique des fluides, de développer des outils d'aide à la décision applicables à des situations grandeur nature. Parmi tous les domaines de l’hydraulique touchés par le numérique, l'intérêt du HACH à modéliser l’ensemble des écoulements à surface libre résulte simplement de leur prépondérance dans les phénomènes hydrodynamiques influents sur lesquels on s'efforce d'agir. A l'échelle du système hydrologique global, le souci de gérer, donc d’anticiper les phénomènes naturels et accidentels, conduit ainsi à couvrir avec des approches physiquement basées les différentes étapes que connaît la goutte d’eau lorsqu’elle frappe la surface terrestre, du ruissellement au gonflement des rus, rivières et zones de stockage, jusqu’aux grands fleuves et voies intérieures de navigation. Délaissant volontairement le formalisme des équations utilisées et des méthodes numériques de résolution, cet article s’attache à prouver la pertinence du recours au numérique par une illustration chronologique (au fil de l’eau) de quelques situations réelles gérées par la suite des programmes WOLF, complètement écrits au sein du HACH. [less ▲]

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See detailPotential valorization for the finest particles of Automotive Shredder Residue (ASR) as filler in bituminous concrete
Bareel, Pierre-Francois; Courard, Luc ULg; Bastin, David ULg et al

in Proceedings of REWAS'04 - Global Symposium on Recycling, Waste Treatment and Clean Technology (2004)

Car manufacturers are faced with increasingly severe European regulations concerning End of Live Vehicles (ELV) recycling. Issues for the coarse fractions of Automotive Shredder Residue (ASR) are now ... [more ▼]

Car manufacturers are faced with increasingly severe European regulations concerning End of Live Vehicles (ELV) recycling. Issues for the coarse fractions of Automotive Shredder Residue (ASR) are now quite largely studied. However, the European objectives could only be achieved by considering the processing and valorization of the fine ASR fraction (< 2mm) which usually represents 5 to 10 wt.% of shredded ELV. A laboratory study was carried out on the fine ASR fraction. By combining granulometric, gravimetric and magnetic separations, four valorizable fractions were identified. This paper presents the valorization of the finest fraction (< 250 μm) as filler in bituminous concrete. Physical and chemical properties were first determined. Bituminous concrete samples were then prepared with different substitution levels of calcareous filler by fine ASR. Marshall tests (mechanical properties) and leaching tests were performed without compromising results. [less ▲]

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See detailProper Orthogonal modes for the characterisation of nonlinear dynamic systems
Kerschen, Gaëtan ULg; Lenaerts, Vincent; Golinval, Jean-Claude ULg et al

in Euromech Colloquim on Nonlinear Modes of Vibrating Systems, Frejus, 2004 (2004)

Modal analysis is extensively used for the analysis and design of structures. However, a major concern for structural dynamicists is that its validity is limited to systems showing a linear behaviour. New ... [more ▼]

Modal analysis is extensively used for the analysis and design of structures. However, a major concern for structural dynamicists is that its validity is limited to systems showing a linear behaviour. New developments have thus been proposed in order to tackle nonlinear systems among which the theory based on the nonlinear normal modes is indubitably the most appealing. In this study, a different approach is adopted and the modes extracted from the proper orthogonal decomposition are considered for the characterization of nonlinear systems. [less ▲]

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See detailAnalysis of the mechanisms of action of Mycosphaerella fijiensis toxins during the development of Black Leaf Streak disease.
Busogoro, J. P.; Etame, J. J.; Lognay, Georges ULg et al

in Mohan Jain, S.; Swennen, Rony (Eds.) Banana improvement: cellular, molecular biology, and induced mutations.Proceedings of a meeting held in Leuven, Belgium, 24-28 September 2001 (2004)

The goal of our programme is to understand the role of M. fijiensis toxins in Black Leaf Streak disease to facilitate early selection of banana genotypes resistant to the disease. Toxic effects induced by ... [more ▼]

The goal of our programme is to understand the role of M. fijiensis toxins in Black Leaf Streak disease to facilitate early selection of banana genotypes resistant to the disease. Toxic effects induced by crude extracts, as well as by purified juglone released by the pathogen in culture filtrates, were analysed on two reference cultivars of banana. Injection of the pathogen metabolites into banana leaves showed a light-dependent toxicity revealed by the development of necrosis and a rapid decrease of the relative vitality index determined from chlorophyll fluorescence measurements. We demonstrated that juglone, a purified metabolite of M. fijiensis, has a direct inhibitory effect on the electron transfer properties of purified banana chloroplasts. Regardless of the bioassay performed, the susceptibility of the two reference cultivars to this metabolite was correlated with their respective sensitivity to the pathogen infection. On the other hand, some preliminary data showed that juglone initiates oxidation of ascorbic acid, the most abundant antioxidant system in plants. On this base, we hypothesized that oxidative damage could be involved in the action of M. fijiensis toxins. [less ▲]

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See detailSensor Validation for On-line Vibration Monitoring
Kerschen, Gaëtan ULg; De Boe, Pascal; Golinval, Jean-Claude ULg et al

in 2nd European Workshop on Structural Health Monitoring, Munich, 2004 (2004)

For a reliable on-line vibration monitoring of structures, it is necessary to have accurate sensor information. However, sensors may sometimes be faulty or may even become unavailable due to failure or ... [more ▼]

For a reliable on-line vibration monitoring of structures, it is necessary to have accurate sensor information. However, sensors may sometimes be faulty or may even become unavailable due to failure or maintenance activities. The problem of sensor validation is therefore a critical part or structural identification. The objective of the present study is to present a procedure based on principal component analysis, which is able to perform detection, isolation and reconstruction of a faulty sensor. Its e ciency is assessed using an experimental application. [less ▲]

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See detailLinks between producers and consumers in alternative food systems in France and Belgium : sustainable development made practical ?
Lamine, Claire; Stassart, Pierre M ULg

in Proceedings of Eursafe Congress 2004 (2004)

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See detailPassive energy transfer and dissipation for isolation from transcient broadband disturbances
Kerschen, Gaëtan ULg; McFarland, D. Michael; Kowtko, J. et al

in US-Korea Joint Seminar/Workshop on Smart Structures Technologies, Seoul, 2004 (2004)

We discuss passive nonlinear energy pumping from a linear (main) mechanical structure to a weakly coupled, local, passive nonlinear energy sink (NES). We show that the NES can be designed to effectively ... [more ▼]

We discuss passive nonlinear energy pumping from a linear (main) mechanical structure to a weakly coupled, local, passive nonlinear energy sink (NES). We show that the NES can be designed to effectively absorb vibrational energy from the main structure in a one-way, irreversible fashion. We demonstrate the occurrence of pumping cascades, where an appropriately designed NES passively extracts energy sequentially from a number of modes of the main (linear) structure, interacting individually with each mode before moving to the next. Experimental results confirm our theoretical findings. The applications of the nonlinear energy pumping phenomenon to the problem of vibration and shock isolation will be discussed [less ▲]

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See detailGlutathione system deficiency in racehorses
De Moffarts, Brieuc; Kirschvink, N.; Art, Tatiana ULg et al

in Handbook of the 43rd Congress of the British Equine Veterinary Association (2004)

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See detailEffet de la fertilisation avec des engrais contenant du sélénium sur le statut sélénique de bovins Blanc-Bleu Belge : résultats préliminaires
Dufrasne, Isabelle ULg; Cabaraux, Jean-François ULg; Coenen, M. et al

in 11èmes Rencontres autour des Recherches sur les Ruminants (2004)

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See detailNumerical simulation of tissue differentiation around loaded implants in a bone chamber
Geris, Liesbet ULg; Vander Sloten, Jos

in In Proceedings of the Mini-Symposium Biomécanique de l'appareil locomoteur (2004)

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See detailA set of efficient numerical tools for floodplain modelling
Archambeau, Pierre ULg; Dewals, Benjamin ULg; Detrembleur, Sylvain ULg et al

in Jirka, G. H.; Uijttewaal, W. S. J. (Eds.) Shallow flows (2004)

In the last years, Europe was subject to catastrophic inundations. At the same time, computer's capacity are increasing such as bidimensional simulations can be applied to real cases. Two compementary ... [more ▼]

In the last years, Europe was subject to catastrophic inundations. At the same time, computer's capacity are increasing such as bidimensional simulations can be applied to real cases. Two compementary theoretical and numerical models are presented and discussed in the present paper: the diffusive approximation and the complete shallow-water approach. An original refinement of meshes is also presented to increase the convergence speed to a steady solution. Numerous comparisons between models and methods of resolution are described. Finally, an example of determination of the flood extension on a natural river is illustrated. [less ▲]

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See detailAuscultation of cardiac murmurs in horses
Amory, Hélène ULg

in Proceedings of 12th Moscow International Veterinary Congress (2004)

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See detailLarge scale 2D numerical modelling of reservoirs sedimentation and flushing operations
Dewals, Benjamin ULg; Erpicum, Sébastien ULg; Archambeau, Pierre ULg et al

in Proceedings of the 9th International Symposium on River Sedimentation (2004)

The quasi-3D flow solver WOLF has been developed at the University of Liege for almost a decade. It has been used to carry out the simulation of silting processes in large reservoirs and to predict the ... [more ▼]

The quasi-3D flow solver WOLF has been developed at the University of Liege for almost a decade. It has been used to carry out the simulation of silting processes in large reservoirs and to predict the efficiency of flushing operations. Besides briefly depicting the mathematical and numerical model, the present paper demonstrates its applicability on the case of a large hydropower project in India. The silting process of the reservoir has been simulated by means of the quasi-3D flow model with a quasi-steady approach. For simulating flushing events, both the topography changes and their interactions with the flow have been carefully handled in a strongly coupled approach. This narrow coupling has required the development of a suitable upwind numerical scheme. Results are presented with 2D- and 3D-views, completed by cross-sections and curves of the variation of key variables. The numerous observations based on those results lead to a global assessment of the silting mechanism and of the flushing efficiency. [less ▲]

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See detailApproche clinique de l’anémie
Amory, Hélène ULg; Gabriel, B

in Proceedings of the Annual meeting of the French Equine Veterinary Association (AVEF) (2004)

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