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See detailA Constitutive Model for Chemically Sensitive Clays.
Boukpeti, N.; Charlier, Robert ULg; Hueckel, T. et al

in Lecture Notes in Earth Sciences n°104 (2004, May)

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See detailChatter maps for process design of powertrain components
Masset, Luc ULg; Debongnie, Jean-François ULg; Belluco, Walter

in Moisan, Alphonse; Poulachon, Gérard (Eds.) Proceedings of the 7th CIRP International Workshop on Modeling of Machining Operations (2004, May)

During rough machining operations of powertrain components, chatter vibrations may occur on the edges of flexible structures. This paper presents a numerical method, based on the finite element method and ... [more ▼]

During rough machining operations of powertrain components, chatter vibrations may occur on the edges of flexible structures. This paper presents a numerical method, based on the finite element method and Tlusty's theory, which gives a chatter map of the machined surface. Each map point represents the greatest depth of cut leading to unconditionally stable cut. Each value depends on the structural damping, the cutting stiffness and the local static stiffness, which is computed using conventional linear elastic FEA. Chatter maps offer a convenient and effective decision support system for robust process design. As a case study, the rough milling operation of a crankcase deck face with a two-stage cutter is presented. [less ▲]

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See detailEvaluation of the group B differential agar for the detection of group B streptococci from vaginal specimens
MELIN, Pierrette ULg; Rodriguez Cuns, Grisel; Lorquet, Sophie et al

in American Society of Microbiology (Ed.) Program and Abstracts of the 104th General Meeting of the American Society for Microbiology (2004, May)

Background Group B streptococci (GBS) are the leading cause of severe perinatal infections. Most current guidelines for the prevention of GBS perinatal disease are based on prenatal screening culture for ... [more ▼]

Background Group B streptococci (GBS) are the leading cause of severe perinatal infections. Most current guidelines for the prevention of GBS perinatal disease are based on prenatal screening culture for vaginal GBS colonisation. Use of selective and differential media could improve the sensitivity of these cultures. Objective To evaluate the GBS-Differential Agar (GBSDA) recently formulated by Becton Dickinson for the selective growth and production of orange colonies of b- hemolytic (b-H) GBS. Methods 283 vaginal swabs (VAG) collected from pregnant women were inoculated in selective Lim broth. After overnight incubation, Lim broth were subcultured on GBSDA, on Granada agar (Biomedics, Spain) and on Columbia blood agar (BA). To evaluate the stability, 99 isolates of GBS (REF) from adult or neonatal infections (Belgian GBS reference laboratory collection) were cultured on GBSDA and Granada at their limit of expiration, and on BA. GBSDA and Granada were incubated anaerobically and BA aerobically + 7% CO2, at 35°C, 24 to 48 h. Positive and negative control strains (GBS ; E. faecalis) were cultured with each run. Specific identification of colonies suggestive of GBS (pale to dark orange on GBSDA and Granada, b-H on BA) was performed. Results b-H GBS were recovered from 63 VAG (22.3 %): 62 were easily identified after overnight incubation on GBSDA and 63 on Granada without requiring any subculture. All GBS were also recovered from BA however it was after many subcultures. All orange colonies were confirmed as GBS. Among REF, 3 strains were non hemolytic ; they grew but were not differentiated as orange colonies on GBSDA or Granada. 96 REF were b-H, 94 (97.9%) produced orange to very dark orange colonies on GBSDA, 2 produced white colonies, and on Granada, 74 (77.1 %) produced pale to dark orange colonies and 22 white to white-orange colonies. Conclusion 1) GBSDA and Granada: a) very high sensitivity and specificity for the detection of b-H GBS, in a single step b) Results available within 48 h after inoculation in Lim broth, low workload 2) Excellent stability up to expiration date for GBSDA 3) Non hemolytic GBS: grown but not differentiated on GBSDA or Granada. [less ▲]

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See detailDoes insuline resistance in acromegaly differ from that in diabetes ?
Beckers, Albert ULg

in Growth and Beyond Workshop Summary : 16-17 May 2004 (2004, May)

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See detailL’isocinétisme, une arme de choix
Croisier, Jean-Louis ULg

in Actes du Congrès International de Médecine du Sport (2004, April 23)

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See detailRoles and competencies of the e-tutor
Denis, Brigitte ULg; Watland, Philip; Pirotte, Sébastien et al

in Banks, S.; Goodyear, P.; Hogdson, V. (Eds.) et al Networked learning 2004 : a research based conference on networked learning and lifelong learning : proceedings of the fourth international conference, Lancaster (2004, April 07)

This paper considers the roles and competencies of the e-tutor. A literature review shows that different roles are assigned to the online tutors. Definitions of these roles are presented and discussed ... [more ▼]

This paper considers the roles and competencies of the e-tutor. A literature review shows that different roles are assigned to the online tutors. Definitions of these roles are presented and discussed. Afterwards, we present eleven roles we consider important to manage the interactions between learners and tutors in an e-learning environment and the competencies needed to support these tutor’s roles. We conclude that to improve the quality of e-learning the tutor’s interventions have to be adapted to a specific context and we propose to train the e-tutors for these roles. [less ▲]

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See detailDevelopment of optical ground verification method for mu m to sub-mm reflectors
Stockman, Yvan ULg; Thizy, Cédric ULg; Lemaire, Philippe ULg et al

in Warmbein, B. (Ed.) Proceedings of the 5th International Conference on Space Optics (ICSO) (2004, April 02)

Large reflectors and antennas for the IR to mm wavelength range are being planned for many Earth observation and astronomical space missions and for commercial communication satellites as well. The ... [more ▼]

Large reflectors and antennas for the IR to mm wavelength range are being planned for many Earth observation and astronomical space missions and for commercial communication satellites as well. The challenging tasks of on-ground testing are to achieve the required accuracy in the measurement of the reflector shapes and antenna structures and to verify their performance under simulated space conditions (vacuum, low temperatures). A small number of infrared interferometers have been commercially developed over the last 10 years but their applications have also been limited due to poor dynamic range and the restricted spatial resolution of their detectors. It has therefore been considered essential, from the viewpoint of supporting future ESA exploration missions, to develop and realise suitable verification tools based on infrared interferometry and other optical techniques for testing large reflector structures, telescope configurations and their performances under simulated space conditions. Two methods and techniques are developed at CSL. The first one is an IR-phase shifting interferometer with high spatial resolution. This interferometer shall be used specifically for the verification of high precision IR, FIR and sub-mm reflector surfaces and telescopes under both ambient and thermal vacuum conditions. The second one presented hereafter is a holographic method for relative shape measurement. The holographic solution proposed makes use of a home built vacuum compatible holographic camera that allows displacement measurements from typically 20 nanometres to 25 microns in one shot. An iterative process allows the measurement of a total of up to several mm of deformation. Uniquely the system is designed to measure both specular and diffuse surfaces [less ▲]

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See detailPartial encryption of images for real-time applications
Van Droogenbroeck, Marc ULg

in Fourth IEEE Signal Processing Symposium (2004, April)

Multimedia systems mostly base security on a restricted access to services. In the context of real-time imaging applications, this model suffers several drawbacks. Applications become vulnerable to ... [more ▼]

Multimedia systems mostly base security on a restricted access to services. In the context of real-time imaging applications, this model suffers several drawbacks. Applications become vulnerable to password attacks and once exposed attackers have access to all the data. An alternative consists of the systematic encryption of all data. When dealing with images, this approach is inconvenient because the data needs to be processed in its entirety before users can gain any insight. As well, the decryption task requires large amounts of processing power. This presentation shows how partial encryption can match applications requirements without the overhead of full encryption. The paper rst analyzes several schemes mixing encryption and image encoding. Then we focus on a technique that implements partial encryption of images based on JPEG. The technique is built to meet two major requirements: (1) preserve the overall bitrate, and (2) remain compliant with the JPEG file format. Finally we introduce and elaborate on a new scheme that combines flexibility, multiple encryption, spatial selectivity, self sufficiency, and format compliance. We show how it could fit the needs of real-time applications. [less ▲]

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See detailEffect of various level of imbalance between energy ans nitrogen supplies on nitrogen metabolism in growing double-muscled Belgian Blue bulls.
Valkeners, Damien; Beckers, Yves ULg; Thewis, André ULg

in Proceeding of the British Society of Animal Science - Annual meeting (2004, April)

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See detailStability and Limit Cycle Oscillation Amplitude Prediction for Simple Nonlinear Aeroelastic Systems
Dimitriadis, Grigorios ULg; Vio, Gareth Arthur; Cooper, Jonathan Edward

in Proceedings of the 45th AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics, and Materials Conference (2004, April)

The prediction of the bifurcation and post-bifurcation behaviour of nonlinear aeroelastic systems is becoming a major area of research in the aeroelastic community due to the need for improved transonic ... [more ▼]

The prediction of the bifurcation and post-bifurcation behaviour of nonlinear aeroelastic systems is becoming a major area of research in the aeroelastic community due to the need for improved transonic aeroelastic prediction, the use of non-linear control systems, and new construction techniques that reduce the amount of inherent damping. In this paper, a novel application of the Centre Manifold Theorem is used to accurately predict bifurcation conditions and Limit Cycle Oscillation amplitudes for simple aeroelastic systems with various types of nonlinearity. A simple aeroelastic system with hardening cubic stiffness nonlinearity is considered and is demonstrated to display a wide variety of bifurcation phenomena. These make it dif cult for some of the standard existing methods, such as Normal Form, Cell Mapping and Tangential Linearisation, to quantify the Limit Cycle Oscillation amplitudes through the entire speed range of the system. Then, the proposed approach is introduced and applied to the same system. It is shown that it can accurately predict the limit cycle amplitudes of the system undergoing all types of bifurcation. Finally, the new technique is applied to the same system but with softening cubic stiffness nonlinearity. It is shown that the method can accurately predict both the static and dynamic divergence boundaries and that it can be used to draw a worst-case stability boundary, inside which the solution is always stable. [less ▲]

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See detailRiver contract in the Sourou valley (Burkina Faso)
Rosillon, Françis ULg

in Muuka, Gerry Nkombo (Ed.) 2004 IAABD Proceedings (2004, April)

Inspired from the experience of river contract in Wallonia (Belgium) since 1990, this paper is describing the implementation of the first river contract in a West-African country, Burkina Faso. This ... [more ▼]

Inspired from the experience of river contract in Wallonia (Belgium) since 1990, this paper is describing the implementation of the first river contract in a West-African country, Burkina Faso. This application isn't limited to a simple transposition of the Walloon model. The Burkina context calls to adaptation to the local environmental and socio-economical realities with an adequate partnership management. The importance of the mobilissation around this project of institutional partners, as well as local collectivities this new tool of water participative management. But will the latter be equal to the task ? A first assessment has been drawn up one year after the launching. [less ▲]

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See detailSurgical debulking of GH secreting pituitary adenomas improves GH control of acromegaly by somatostatin analogs
Beckers, Albert ULg; Petrossians, Patrick ULg; Borges Martins, L. et al

in ENEA congress : Napoli, April 2004 (2004, April)

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See detailHormonal and biochemical normalization and tumor shrinkage induced by anti-parathyroid hormone immunotherapy in a patient with metastatic parathyroid carcinoma
Betea, Daniela ULg; Bradwell, A. R.; Harvey, T. C. et al

in ENEA congress : Napoli, April 2004 (2004, April)

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See detailApproaching the true prevalence of pituitary tumors
Beckers, Albert ULg; Adam, C.; Ciccarelli, A. et al

in ENEA congress : Napoli, April 2004 (2004, April)

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See detailMale hypogonadism caused by isolated LH deficiency : From pathology to gene, from gene to physiology
Valdes Socin, Hernan Gonzalo ULg; Salvi, R.; Pralong, F. et al

in ENEA congress : Napoli, April 2004 (2004, April)

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See detailModelling the seasonal cycle of the biological productivity in the Ligurian Sea by means of a 1D interdisciplinary model
Raick, C.; Soetaert, K.; Grégoire, Marilaure ULg

in VLIZ Young Scientists' Day, Brugge, Belgium 5 March 2004: book of abstracts. VLIZ Special Publication, 17 (2004, March 05)

A one-dimensional coupled physical-biogeochemical model has been built to study the pelagic food web of the Ligurian Sea (NW Mediterranean Sea). The physical model is the turbulent closure model (version ... [more ▼]

A one-dimensional coupled physical-biogeochemical model has been built to study the pelagic food web of the Ligurian Sea (NW Mediterranean Sea). The physical model is the turbulent closure model (version 1D) developed at the GeoHydrodynamics and Environmental Laboratory (GHER) of the University of Liège. The ecosystem model contains nineteen state variables describing the carbon and nitrogen cycles of the pelagic food web. Phytoplankton and zooplankton are both divided in three size-based compartments and the model includes an explicit representation of the microbial loop including bacteria, dissolved organic matter, nano-, and micro- zooplankton. The internal carbon/nitrogen ratio is assumed variable for phytoplankton and detritus, and constant for zooplankton and bacteria. Silicate is considered as a potential limiting nutrient of phytoplankton growth. The aggregation model described in Kriest and Evans (2000) is used to evaluate the sinking rate of particulate detritus. The model is forced at the air-sea interface by meteorological data coming from METEO France. The DYFAMED time series data obtained during the year 2000 are used to calibrate and validate the biological model. The comparison of model results within in-situ DYFAMED data shows that although some processes are not represented by the model, such as horizontal and vertical advections, model results are in good agreement with observations and differences observed can be explained with environmental conditions. [less ▲]

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See detailCharakterisierung des bronchialen “remodellings” in einem Modell von felinem Asthma
Kirschvink, N.; Delvaux, François ULg; Vincke, G. et al

in 45. Kongress der Deutschen Gesellschaft für Pneumologie - Frankfurt - Allemangne - Mars 2004 (2004, March)

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See detailImplication of surface charge effects in color removal from effluents by chemical coagulation - the case of CI Reactive Blue 4 dye
Gaydardzhiev, Stoyan ULg; Ay, Peter

in Pratsinis, S. (Ed.) Proceeedings CD of Partec 2004 Inetrnational Congress of Particle Technology (2004, March)

Characterisation of dye flcos during colour removal from synthetic waste water is presented. Surface charge and floc size and shapes are measured and an implications towards the predominant removal ... [more ▼]

Characterisation of dye flcos during colour removal from synthetic waste water is presented. Surface charge and floc size and shapes are measured and an implications towards the predominant removal emchanisms is made. [less ▲]

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See detailEvaluation de l'expression orale et de l'expression écrite en langues étrangères : présentation et analyse de différents outils
Beckers, Jacqueline ULg; Simons, Germain ULg; Van Hoof, Florence ULg et al

in Actes du 3ème congrès des chercheurs en éducation : (re)trouver le plaisir d'enseigner et d'apprendre. Construire savoirs et compétences (2004, March)

Cette communication présente une réflexion sur le type de tâches à proposer lors de l évaluation certificative, ensuite sur les critères à prendre en compte et enfin sur les indicateurs de réussite. Cette ... [more ▼]

Cette communication présente une réflexion sur le type de tâches à proposer lors de l évaluation certificative, ensuite sur les critères à prendre en compte et enfin sur les indicateurs de réussite. Cette réflexion repose d'une part sur un programme de recherche-action portant sur l optimisation de l expression orale en anglais/langue étrangère [2000-2002], et sur un autre programme de recherche-action portant sur l identification et la déconstruction de stéréotypes liés à la langue et à la culture étrangères (néerlandais et français) [2002-2004], et d'autre part sur les travaux réalisés au sein de la Commission de Pilotage du Système éducatif. [less ▲]

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See detailPrésentation de deux grandes approches didactiques destinées à articuler compétences et savoirs dans le domaine de l'apprentissage des langues étrangères en contexte scolaire
Beckers, Jacqueline ULg; Simons, Germain ULg; Van Hoof, Florence ULg et al

in Actes du 3ème congrès des chercheurs en éducation : (re)trouver le plaisir d'enseigner et d'apprendre. Construire savoirs et compétences (2004, March)

Dans cette communication, nous présenterons deux grandes approches didactiques destinées à articuler compétences et savoirs linguistiques dans le domaine de l enseignement de l anglais et du néerlandais ... [more ▼]

Dans cette communication, nous présenterons deux grandes approches didactiques destinées à articuler compétences et savoirs linguistiques dans le domaine de l enseignement de l anglais et du néerlandais/langues étrangères. Dans les deux cas, le public-cible est constitué d élèves évoluant dans l enseignement secondaire général supérieur. [less ▲]

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See detailLa coordination horizontale, un mode de gestion des compétences stratégique pour une justice face à de nouvelles exigences ?
Schoenaers, Frédéric ULg

in Management des compétences et des connaissances : outils stratégiques en GRH (2004, March)

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See detailION BEAM FIGURING OF CVD SILICON CARBIDE MIRRORS
Gailly, Patrick ULg

in Warmbein, B (Ed.) Proceedings of the 5th International Conference on Space Optics (ICSO 2004) (2004, March)

Optical and structural elements made of silicon carbide are increasingly found in space instruments. Chemical vapor deposited silicon carbide (CVD-SiC) is used as a reflective coating on SiC optics in ... [more ▼]

Optical and structural elements made of silicon carbide are increasingly found in space instruments. Chemical vapor deposited silicon carbide (CVD-SiC) is used as a reflective coating on SiC optics in reason of its good behavior under polishing. The advantage of applying ion beam figuring (IBF) to CVD-SiC over other surface figure-improving techniques is discussed herein. The results of an IBF sequence performed at the Centre Spatial de Liège on a 100 mm CVD-SiC mirror are reported. The process allowed to reduce the mirror surface errors from 243 nm to 13 nm rms . Beside the surface figure, roughness is another critical feature to consider in order to preserve the optical quality of CVD-SiC . Thus, experiments focusing on the evolution of roughness were performed in various ion beam etching conditions. The roughness of samples etched at different depths down to 3 m was determined with an optical profilometer. These measurements emphasize the importance of selecting the right combination of gas and beam energy to keep roughness at a low level. Kaufman-type ion sources are generally used to perform IBF but the performance of an end-Hall ion source in figuring CVD-SiC mirrors was also evaluated in this study. In order to do so, ion beam etching profiles obtained with the end-Hall source on CVD-SiC were measured and used as a basis for IBF simulations. [less ▲]

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See detailBilan d'une saison très tardive du point des maladies: Résultats des essais fongicides en 2003 sur le site de Lonzée
Vancutsem, Françoise ULg; Moreau, Jean-Marc; Bodson, Bernard ULg

in Fumure et protection phytosanitaire des céréales (2004, February 18)

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See detailFractionnement de la fumure azotée: deux ou trois fractions? fumure au tallage ou pas?
Bodson, Bernard ULg; Vancutsem, Françoise ULg; Destain, Jean-Pierre ULg et al

in Fumure et protection phytosanitaire des céréales (2004, February 18)

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See detailLes conseils de fumure azotée
Bodson, Bernard ULg; Destain, Jean-Pierre ULg; Vancutsem, Françoise ULg et al

in Fumure et protection phytosanitaire des céréales (2004, February 18)

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See detailFroments alternatifs et de printemps
Couvreur, Luc; Vancutsem, Françoise ULg; Bodson, Bernard ULg et al

in Fumure et protection phytosanitaire des céréales (2004, February 18)

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See detailInventory control in a multi-supplier system
Arda, Yasemin ULg; Hennet, Jean-Claude

in IGLS 04, 13th International Working Seminar on Production Economics, Igls/Innsbruck, Austria, 16-20 February 2004 (2004, February 16)

An enterprise network is analyzed from the viewpoint of an end-product manufacturer who receives customer orders and organises his production and supply policy so as to minimize the sum of his average ... [more ▼]

An enterprise network is analyzed from the viewpoint of an end-product manufacturer who receives customer orders and organises his production and supply policy so as to minimize the sum of his average holding cost and average stock-out cost. For each main component to be ordered, the producer has several possible suppliers. The arrivals of customers’ orders are random and delivery times from suppliers are also supposed random. This supply system is represented as a queuing network and the producer uses a base-stock inventory control policy that keeps constant the position inventory level (current inventory level + pending replenishment orders). The decision variables are the reference position inventory level and the percentages of orders sent to the different suppliers. In the queuing network model, the percentages of orders are implemented as Bernoulli branching parameters. A close-form expression of the expected cost criterion is obtained as a complex non-linear function of decision variables. A decomposed approach is proposed for solving the optimization problem in an approximate manner. The quality of the approximate solution is evaluated by comparison to the exact solution, which can be computed numerically in some simple cases, in particular in the two-supplier case. Numerical applications show the important economic advantage for the producer of sending orders to several suppliers rather than to a single one. [less ▲]

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See detailMAGRITTE: an instrument suite for the solar atmospheric imaging assembly (AIA) aboard the Solar Dynamics Observatory
Rochus, Pierre ULg; Defise, Jean-Marc ULg; Halain, Jean-Philippe ULg et al

in Society of Photo-Optical Instrumentation Engineers (SPIE) Conference Series (2004, February 01)

The Solar Atmospheric Imaging Assembly (AIA) aboard the Solar Dynamics Observatory will characterize the dynamical evolution of the solar plasma from the chromosphere to the corona, and will follow the ... [more ▼]

The Solar Atmospheric Imaging Assembly (AIA) aboard the Solar Dynamics Observatory will characterize the dynamical evolution of the solar plasma from the chromosphere to the corona, and will follow the connection of plasma dynamics with magnetic activity throughout the solar atmosphere. The AIA consists of 7 high-resolution imaging telescopes in the following spectral bandpasses: 1215Å. Ly-a, 304 Å He II, 629 Å OV, 465 Å Ne VII, 195 Å Fe XII (includes Fe XXIV), 284 Å Fe XV, and 335 Å Fe XVI. The telescopes are grouped by instrumental approach: the MAGRITTE Filtergraphs (R. MAGRITTE, famous 20th Century Belgian Surrealistic Artist), five multilayer EUV channels with bandpasses ranging from 195 to 1216 Å, and the SPECTRE Spectroheliograph with one soft-EUV channel at OV 629 Å. They will be simultaneously operated with a 10-second imaging cadence. These two instruments, the electronic boxes and two redundant Guide Telescopes (GT) constitute the AIA suite. They will be mounted and coaligned on a dedicated common optical bench. The GTs will provide pointing jitter information to the whole SHARPP assembly. This paper presents the selected technologies, the different challenges, the trade-offs to be made in phase A, and the model philosophy. From a scientific viewpoint, the unique combination high temporal and spatial resolutions with the simultaneous multi-channel capability will allow MAGRITTE / SPECTRE to explore new domains in the dynamics of the solar atmosphere, in particular the fast small-scale phenomena. We show how the spectral channels of the different instruments were derived to fulfill the AIA scientific objectives, and we outline how this imager array will address key science issues, like the transition region and coronal waves or flare precursors, in coordination with other SDO experiments. We finally describe the real-time solar monitoring products that will be made available for space-weather forecasting applications. [less ▲]

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See detailMAGRITTE optomechanical design and mirror manufacturing
Mazy, Emmanuel ULg; Defise, Jean-Marc ULg; Halain, Jean-Philippe ULg et al

in Society of Photo-Optical Instrumentation Engineers (SPIE) Conference Series (2004, February 01)

The MAGRITTE telescopes are part of the SHARPP instrument suite, part of the Solar Dynamics Observatory (SDO), a NASA spacecraft to be launched in a geostationnary orbit in 2007. The MAGRITTE instrument ... [more ▼]

The MAGRITTE telescopes are part of the SHARPP instrument suite, part of the Solar Dynamics Observatory (SDO), a NASA spacecraft to be launched in a geostationnary orbit in 2007. The MAGRITTE instrument package will provide high resolution images of the solar corona at high temporal frequency simultaneously in 5 EUV and in Ly-alpha narrow bandpasses. The 1.4 R[SUB]0[/SUB] MAGRITTE common field of view complements the other SHARPP instruments, as well as its spectral coverage with 6 narrow bandpasses located within the 19.5 to 120 nm interval. The key challenges of the MAGRITTE instrument are a high angular resolution (0.66 arcsec/pixel) with a high responsivity (exposure times smaller than 8 sec), combined with restricted spacecraft resources. The design of MAGRITTE is based on a high performance off-axis Ritchey-Chretien optical system combined with a large detector (4 K x 4 K, 12 µm pixel). The tight pointing stability performance of 1.2 arcsec over the image exposure time requires an active image motion control, using pointing information of a Guide Telescope, to compensate low frequency boresight variations produced by spacecraft jitter. The thermomechanical design and the mirror polishing are highly critical issues in the instrument design. This paper presents the MAGRITTE design concept with the expected performances based on a realistic error budget. The mirror polishing concept and performances are discussed. [less ▲]

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See detailDesign of an implantable micropump
Smal, Olivier; Merken, Patrick; Croquet, Vincent et al

in Proceedings of the International Precision Assembly Seminar (2004, February)

The implantable programmable micropump is an interesting solution to treat chronic diseases such as diabetes with regular micro-injections of medicine. However, current applications of micropumps are ... [more ▼]

The implantable programmable micropump is an interesting solution to treat chronic diseases such as diabetes with regular micro-injections of medicine. However, current applications of micropumps are limited by their rather expensive cost. The challenge is therefore to develop a low cost alternative by reducing the number of parts and by simplifying the assembly. As the pump and its tank will be placed under the skin in order to increase comfort, such a system should be small and reliable. In this paper, we present the micropump we developed within the framework of the 4M-µ pump interuniversity project (Methods and Means for the Miniaturization of Machines). [less ▲]

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See detailDesign and test of a circular notch hinge
Merken, Patrick; Smal, Olivier; Debongnie, Jean-François ULg et al

in Proceedings of the International Precision Assembly Seminar (2004, February)

At the microscale, classical bearings such as ball bearings, sliding bearings and other pivots may be difficult to manufacture. Among all possible solutions to replace them, the notch hing seems to be ... [more ▼]

At the microscale, classical bearings such as ball bearings, sliding bearings and other pivots may be difficult to manufacture. Among all possible solutions to replace them, the notch hing seems to be very attractive through its many advantages. The major limitation is on the rotation angle. This paper presents a new simplified analytical model for the prediction of the maximum angular displacement and the angular stiffness of a notch hinge. To validate our model, an experimental set-up has been developed. [less ▲]

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See detailMise au point d'une méthode de détermination in vitro du taux de fermentation des fibres dans le gros intestin du porc
Boudry, Christelle ULg; Buldgen, André; Anciaux, Benoit et al

in 36èmes Journées de la Recherche Porcine (2004, February)

L’objectif des études synthétisées dans cette communication consiste à mettre au point une méthode in vitro, simple, fiable et respectueuse du bien-être animal, pour mesurer la fermentation des fibres ... [more ▼]

L’objectif des études synthétisées dans cette communication consiste à mettre au point une méthode in vitro, simple, fiable et respectueuse du bien-être animal, pour mesurer la fermentation des fibres dans le gros intestin du porc. Les travaux ont été réalisés en adaptant la méthode de BOISEN et FERNANDEZ à la pepsine-pancréatine pour simuler la digestion des aliments dans la première partie du tube digestif. La méthode d’incubation en seringues de MENKE et STEINGASS a ensuite été utilisée pour quantifier la production de gaz des résidus de la prédigestion. Les expériences, réalisées au moyen de porcs en croissance, ont porté sur la quantité et le mode de filtration des substrats prédigérés par la pepsine-pancréatine, l’identification d’un aliment de référence, la dilution des inoculi dans la solution tampon en seringues et la comparaison des fermentations, en utilisant comme inoculi des contenus d’intestin ou des matières fécales. Les résultats montrent que la répétabilité de la digestion in vitro par la pepsine-pancréatine est satisfaisante et que les quantités d’aliment incubées peuvent être augmentées par rapport à la méthode de référence. La filtration des résidus peut être réalisée sur creusets filtrants ou sur toile Nylon. La pulpe de betterave constitue un aliment témoin idéal. Après 24 h d’incubation, la production de gaz obtenue à partir d’inoculi fécaux dilués 20 fois dans la solution tampon est identique à celle enregistrée à partir d’inoculi intestinaux dilués 10 fois dans le même tampon. [less ▲]

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See detailLearning movement patterns in mobile networks: a generic method
François, Jean-Marc; Leduc, Guy ULg; Martin, Sylvain ULg

in European Wireless 2004 (2004, February)

Predicting terminals movements in mobile networks is useful for more than one reason, in particular for routing management. A way to do such prediction is to learn the movement patterns of mobile nodes ... [more ▼]

Predicting terminals movements in mobile networks is useful for more than one reason, in particular for routing management. A way to do such prediction is to learn the movement patterns of mobile nodes passing by an access router. In this paper, the information (e.g. layer 2 measurements) related to the different paths followed by mobiles are learned using a hidden Markov model. Simulations have been done using this method and show it can handle different layer~2 signals and collect statistical information when no such signal is available. Furthermore, the method works when no information is available and can be extended so as to guess the timing of the handoffs. [less ▲]

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See detailENEAS: the European Network of Excellence in AsteroSeismology
Aerts, C.; Baglin, A.; Christensen-Dalsgaard, J. et al

in Favata, F.; Aigrain, S.; Wilson, A. (Eds.) Second Eddington Workshop: Stellar structure and habitable planet finding, 9 - 11 April 2003, Palermo, Italy (2004, January 01)

Asteroseismology is one of the major important science topics in astrophysics in the coming decade. Several recent breakthroughs have indeed been made in Europe in this field. The observational data will ... [more ▼]

Asteroseismology is one of the major important science topics in astrophysics in the coming decade. Several recent breakthroughs have indeed been made in Europe in this field. The observational data will improve significantly in the near future, as upgraded ground-based instruments are being built and two European asteroseismic space missions are planned for launch between 2005 and 2008. They will provide us for the first time with ultra-high-accuracy, high-temporal resoluton data from space for stars other than the Sun. A successful asteroseismic study involves many different steps, from state-of-the-art raw data treatment to theoretical physical modelling of the oscillation frequencies. Our network is set up to meet the needs of combining and exchanging the different expertises of the participating institutes, of training PhD students and of both training and exchanging post-doctoral researchers. This will guarantee the most fruitful and efficient exploitation of the very substantial investments that are being made in Europe in future observations of stellar oscillations, strengthening Europe's leading position in this research field. Also, it will be a test-bed for the development of efficient procedures for collaboration across the internet, involving a vast range of procedures and skills, as well as extensive common use of a broad variety of data. Furthermore, procedures will be incorporated for the joint training of students, which is an essential part of our project. [less ▲]

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See detailPreliminary Results from the XMM Medium Deep Survey
Maraschi, L.; Tajer, M.; Trinchieri, G. et al

in Mújica, Raúl; Maiolino, Roberto (Eds.) Multiwavelength AGN Surveys, Proceedings of the Guillermo Haro Conference (2004, January 01)

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See detailAdditional science potential for COROT
Weiss, W. W.; Aerts, C.; Aigrain, S. et al

in Favata, F.; Aigrain, S.; Wilson, A. (Eds.) Stellar Structure and Habitable Planet Finding (2004, January 01)

Space experiments which are aiming towards asteroseismology and the detection of exoplanets, like COROT or MOST, Eddington and Kepler, are designed to deliver high precision photometric data. Obviously ... [more ▼]

Space experiments which are aiming towards asteroseismology and the detection of exoplanets, like COROT or MOST, Eddington and Kepler, are designed to deliver high precision photometric data. Obviously, they can be used also for other purposes than the primary science goals and in addition many other targets can or will be automatically observed simultaneously with the primary targets. As a consequence, fascinating possibilities for additional (parallel, secondary) science projects emerge. For COROT a dedicated working group was thus established with the goal to contribute any useful information which may optimize the scientific output of the mission. [less ▲]

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See detailThe Photospheric Abundances of Active Binaries: First Results
Morel, Thierry ULg; Micela, G.; Favata, F. et al

in Stars as Suns : Activity, Evolution and Planets (2004, January 01)

The coronal abundances of chromospherically active binaries have come under close scrutiny in recent years thanks to several X-ray satellites such as XMM or Chandra. Unfortunately a detailed analysis of ... [more ▼]

The coronal abundances of chromospherically active binaries have come under close scrutiny in recent years thanks to several X-ray satellites such as XMM or Chandra. Unfortunately a detailed analysis of the chemical fractionation processes that are possibly operating between the photosphere and the corona is plagued by the lack of reliable and accurate photospheric abundance determinations. In particular a detailed investigation of the photospheric metal content seems worthwhile in the light of several studies that have questioned the customary use of photometric indices as effective temperature indicators in active binaries. We shall present our ongoing effort to determine in a self-consistent way accurate physical parameters and photospheric abundances for a large number of systems and discuss the implications of our results on their abundance patterns and evolutionary status. Preliminary results suggest that these systems are not as iron-deficient as found in previous studies and indicate an overabundance of several key elements (e.g. Na Mg Al Ca) with respect to the solar pattern. [less ▲]

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See detailNon-adiabatic pulsations in delta Scuti stars
Moya, A.; Garrido, R.; Dupret, Marc-Antoine ULg

in Stellar Structure and Habitable Planet Finding (2004, January 01)

For delta Scuti stars, phase differences and amplitude ratios between the relative effective temperature variation and the relative radial displacement can be derived from multicolor photometric ... [more ▼]

For delta Scuti stars, phase differences and amplitude ratios between the relative effective temperature variation and the relative radial displacement can be derived from multicolor photometric observations. The same quantities can be also calculated from theoretical non-adiabatic pulsation models. We present here these theoretical results, which indicate that non-adiabatic quantities depend on the mixing length parameter alpha used to treat the convection in the standard Mixing Length Theory (MLT). This dependence can be used to test and to constrain, through multicolor observations, the way MLT describes convection in the outermost layers of the star. We will use the equilibrium models provided by the CESAM evolutionary code. The pulsational observables are calculated by using a non-adiabatic pulsation code developed by R. Garridon and A. Moya. In the evolutionary and pulsation codes, a complete reconstruction of the non-grey atmosphere (Kurucz models) is included. The interaction between pulsation and atmosphere, as described by Dupret et al. (2002), is also included in the code. [less ▲]

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See detailQTL analysis of the expression of the low-gossypol seed and high gossypol plant trait in the progeny of the Gossypium hirsutum x G. raimondii x G. sturtanium trispecific hybrid
Benbouza, H.; Lacape, M.; Courtois, B. et al

in Proceedings of the Beltwide cotton improvement conference (2004)

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See detailStudy of surface active properties and thermal behaviour of enzymatically prepared sugar esters
Blecker, Christophe ULg; Deroanne, Claude; Lognay, Georges ULg et al

in Proceedings "Cosm'ing 2004 : Cosmetic Ingredients and Biotechnology" (2004)

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See detailFabrication of micromirrors with pyramidal shape using anisotropic etching of silicon with KOH
Moktadir, Zakaria; Prakash, G. V.; Koukharenko, Elena et al

in Conference on Lasers and Electro-Optics (CLEO) (2004)

We report in this work the fabrication and optical characterization of micromirrors with inversed pyramidal shape (pits). The pyramids are etched on silicon using an anisotropic etchant and then gold ... [more ▼]

We report in this work the fabrication and optical characterization of micromirrors with inversed pyramidal shape (pits). The pyramids are etched on silicon using an anisotropic etchant and then gold coated to form a mirror. [less ▲]

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See detailA generic approach for image classification based on decision tree ensembles and local sub-windows
Marée, Raphaël ULg; Geurts, Pierre ULg; Piater, Justus ULg et al

in Proceedings of the 6th Asian Conference on Computer Vision (2004)

A novel and generic approach for image classification is presented. The method operates directly on pixel values and does not require feature extraction. It combines a simple local sub-window extraction ... [more ▼]

A novel and generic approach for image classification is presented. The method operates directly on pixel values and does not require feature extraction. It combines a simple local sub-window extraction technique with induction of ensembles of extremely randomized decision trees. We report results on four well known and publicly available datasets corresponding to representative applications of image classification problems: handwritten digits (MNIST), faces (ORL), 3D objects (COIL-100), and textures (OUTEX). A comparison with studies from the computer vision literature shows that our method is competitive with the state of the art, an interesting result considering its generality and conceptual simplicity. Further experiments are carried out on the COIL-100 dataset to evaluate the robustness of the learned models to rotation, scaling, or occlusion of test images. These preliminary results are very encouraging [less ▲]

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See detailDeep drawing simulations with different polycrystalline models
Duchene, Laurent ULg; de Montleau, P.; Bouvier, S. et al

in Gosh, Somnath; Castro, Jose M.; Lee, June K. (Eds.) Materials Processing and Design: Modeling, Simulation and Applications (NUMIFORM 2004) (2004)

The goal of this research is to study the anisotropic material behavior during forming processes, represented by both complex yield loci and kinematic-isotropic hardening models. A first part of this ... [more ▼]

The goal of this research is to study the anisotropic material behavior during forming processes, represented by both complex yield loci and kinematic-isotropic hardening models. A first part of this paper describes the main concepts of the ‘Stress-strain interpolation’ model that has been implemented in the non-linear finite element code Lagamine. This model consists of a local description of the yield locus based on the texture of the material through the full constraints Taylor’s model. The texture evolution due to plastic deformations is computed throughout the FEM simulations. This ‘local yield locus’ approach was initially linked to the classical isotropic Swift hardening law. Recently, a more complex hardening model was implemented: the physically-based microstructural model of Teodosiu. It takes into account intergranular heterogeneity due to the evolution of dislocation structures, that affects isotropic and kinematic hardening. The influence of the hardening model is compared to the influence of the texture evolution thanks to deep drawing simulations. [less ▲]

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See detailUtilité des biotechnologies de la reproduction pour la sélection des bovins laitiers
Colleau, J. J.; Fritz, S.; Druet, Tom ULg et al

in Renc. Rech. Ruminants, 2004, 11 (2004)

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See detailLa portée du témoignage de Pausanias sur les cultes locaux
Pirenne-Delforge, Vinciane ULg

in Labarre, Guy (Ed.) Les cultes locaux dans les mondes grec et romain. Actes du colloque de Lyon, 7-8 juin 2001) (2004)

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See detailUn manuscrit inédit des Mille et une nuits: à propos de l'exemplaire de l'université de Liège (ms. 2241)
Bauden, Frédéric ULg

in Chraïbi, Aboubakr (Ed.) Les Mille et une nuits en partage (2004)

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See detailDesign and Simulation of a micromachined inertial sensors with higher-order single loop sigma-delta modulators
DONG, Y; Kraft, Michael ULg

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

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See detailSpace Geodesy at the Royal Observatory of Belgium
Beuthe, Michaël; Bruyninx, Carine; Carpentier, Georges et al

in COSPAR report Period 2002-2003 (2004)

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See detailNonlinear energy pumpin: A new paradigm for vibration isolation
Vakakis, Alexander F.; McFArland, D. Michael; Kerschen, Gaëtan ULg et al

in 3rd China-Japan US Symposium on Health Mondial and Control of Structures, Dalian, 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 detailThermo-elasto-plastic modeling of the behaviour of metals submitted to finite strains. A coupled thermo-mechanical approach
Ponthot, Jean-Philippe ULg; Adam, L.

in Proceedings of ENIEF 2004, XIV Congress on numerical methods and their applications (2004)

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See detail« Questions choisies de droit des biens : servitudes et mitoyenneté »,
Lecocq, Pascale ULg; Boufflette, Sophie ULg; Vandeweerd, Nathalie

in Chronique de droit à l'usage des juges de paix et de police 2004 (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 detailUn système d'indicateurs d'équité des systèmes éducatifs européens : un outil d'analyse des politiques d'éducation et de formation en Communauté française de Belgique
Nicaise, Julien; Straeten, Marie-Hélène; Baye, Ariane ULg et al

in Actes du troisième congrès des chercheurs en éducation (2004)

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See detailLaboratory investigation of inlays and surface treatments for the decoration of copper based alloy objects from the imperial roman period
Mathis, François ULg; Descamps, Sophie; Robcis, Dominique et al

in 34th INTERNATIONAL SYMPOSIUM ON ARCHAEOMETRY (2004)

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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 detailTeledetección Geológica de la Región de San Pablo de Lipez - Bolivia
Caceres, Fernando; Pirard, Eric ULg

in XVI Congreso Geologico Boliviano (2004)

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See detailStaff development and e-tutors training
Banks, Sheena; Denis, Brigitte ULg; Fors, Uno et al

in Banks, Sheena; Goodyear, Peter; Hodgson, Vivien (Eds.) et al Networked learning 2004 : a research based conference on networked learning in higher education and lifelong learning : proceedings of the fourth international conference, Lancaster (2004)

This paper considers the rationale for the training and staff development of e-tutors. We then examine how this is implemented in practice through the presentation of case studies from three European ... [more ▼]

This paper considers the rationale for the training and staff development of e-tutors. We then examine how this is implemented in practice through the presentation of case studies from three European universities. Finally we analyse the differences and similarities of these case studies to exemplify some principles for training models and guidelines for training of e-tutors. We conclude that although it is possible to identify these principles of good practice, there is great flexibility and diversity of methods and approaches in the training and staff development of e-tutors. [less ▲]

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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 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 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 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 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 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 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 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 detailMesoscopic model of intergranular cracks in low carbon steel during cooling of continuous casting
Castagne, S.; Pascon, Frédéric ULg; Lecomte-Beckers, Jacqueline ULg et al

in Lamberigts, M. (Ed.) Proceedings of the 2nd international conference of thermomechanical processing of steels (TMP 2004) (2004)

This paper addresses the problem of transverse cracking during the continuous casting of low carbon steel. The damage mechanisms occurring at high temperature during this process are identified and a ... [more ▼]

This paper addresses the problem of transverse cracking during the continuous casting of low carbon steel. The damage mechanisms occurring at high temperature during this process are identified and a numerical approach for the modelling of these phenomena at the grain scale is proposed. Experiments allowing the identification of the model’s parameters are described. Finally, the first results obtained with the model are presented. [less ▲]

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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 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 detailGeneration of digital surface models and orthophotos of urban areas with IKONOS stereopairs
Devriendt, Dennis; Goossens, Rudi; Binard, Marc ULg

(2004)

The purpose of the presented research project is to investigate how present-day EO-technology can support local and regional decision-making, particularly in Belgium, and to develop prototype versions of ... [more ▼]

The purpose of the presented research project is to investigate how present-day EO-technology can support local and regional decision-making, particularly in Belgium, and to develop prototype versions of value-added products that fulfill some of the actual information needs, as expressed by Belgian authorities at the local and at the regional level. One of the technical research modules is focussing on the geometrical aspects of VHR data processing. Due to the capability of the IKONOS sensor up to an angle of 26° off-nadir, the satellite can take stereo image pairs. An IKONOS stereo pair consists of two images of the same location taken from two different perspectives on the same orbital pass. Although it is possible to obtain a stereopair from two images from different orbital passes and with a large time interval, it is proved that the stereopairs ordered from Spaceimaging or resellers gives better results (2004, Taillieu et al.). This paper describes the method applied for DSM generation from an IKONOS stereopair, over an urban area. The geometrical accuracy of the DSM is compared with the accuracy of a DSM, derived from aerial photography at scales of 1:12000 and 1:4000. The satellite-derived DSM is used for ortho-rectification of VHR imagery. The accuracy of the ortho-rectified images is compared with ortho-rectifications of the same images, based on the aerial photo DSM. [less ▲]

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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 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 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 detailApproche quantitative de la consommation alimentaire en Région wallonne
Duquesne, Brigitte ULg; Cordier, L.

in Rencontre Agriculture – Alimentation – Santé (2004)

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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 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 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 detailSelenium enriched grass silage and winter barely for growing bulls: feedstuff composition and animal performance
de Behr, V.; Cabaraux, Jean-François ULg; Delobel, A. et al

in Proceedings of the British Society of Animal Science (2004)

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See detailMinimising perceived latency in audio-conferencing systems over application-level multicast
Blundell, N.; Mathy, Laurent ULg

in Proceedings of MIPS Workshop (2004)

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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 detailStructural investigations of HSS rolls for hot strip mill
Lecomte-Beckers, Jacqueline ULg; Tchuindjang, Jérôme Tchoufack ULg; Ernst, R. et al

in Proceedings of the 41st Rolling Seminar Processes, Rolled and Coated Product (2004)

High Speed Steel (HSS) cast rolls are used in front finishing stands of hot strip mills (HSM). Good wear resistance and hardness at high temperatures, are defining features of HSS. Previous experience has ... [more ▼]

High Speed Steel (HSS) cast rolls are used in front finishing stands of hot strip mills (HSM). Good wear resistance and hardness at high temperatures, are defining features of HSS. Previous experience has shown that HSS rolls containing mainly hard MC carbides have a high friction coefficient, which is detrimental for the rolling power consumption and for the strip surface quality. On the other hand, HSS rolls containing eutectic rod shaped carbides are brittle and more susceptible to spalling. To overcome these problems, a suitable grade, called HSS7, that gives the best compromise between a low friction coefficient and a high crack propagation and wear resistance was developed. That alloy contains well-dispersed hard VC carbides improving wear, and non-interconnected eutectic carbides of the M2C and M7C3 type, hindering crack propagation. All the metallurgical factors affecting the performance and damage of under rolling condition in front finishing stands are reviewed: wear resistance, friction coefficient, resistance to rolling incident, and oxide film formation. The effect of nature, morphology and amount was for each of the carbides studied and connected to the factor affecting the behaviour of the new grade developed. Different techniques are used such as: differential thermal analysis, optical and electron scanning microscopy and image analysis. A correlation with mechanical properties was also performed. [less ▲]

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See detailAdipocyte fatty acid-binding protein expression and mitochondrial activity as indicators of intramuscular fat content in young bulls
Barnola, I.; Hocquette, J. F.; Jurie, C. et al

in Book of Abstracts of the 55th Annual Meeting of the European Association for Animal Production (2004)

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See detailTroubles nerveux accompagnant les maladies organiques ou métaboliques
Amory, Hélène ULg

in Proceedings of 2ème Journée Toulousaine de Médecine Equine (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 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 detailInfluence of selenium enriched fertilizers on the selenium content in grass and the selenium status in a suckling herd offered selenium enriched grass, silage and barley
Dufrasne, Isabelle ULg; Cabaraux, Jean-François ULg; Coenen, M. et al

in Book of Abstracts of the 55th Annual Meeting of the European Association for Animal Production (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 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 detailTroubles proprioceptifs spécialisés : Syndrome cerebelleux et vestibulaire
Amory, Hélène ULg

in Proceedings of 2ème Journée Toulousaine de Médecine Equine (2004)

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See detailRayleigh-Marangoni-Benard instability of a Ferrofluid Layer, in a Vertical Magnetic Field
Hennenberg, M.; Weyssow, B.; Slavtchev, S. et al

in 10th International Conference on Magnetic Fluids (2004)

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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 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 detailDermatophytosis: efficacy of commercial vaccines?
Mignon, Bernard ULg

in Proceedings of the 5th World Congress of Veterinary Dermatology (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, 20th General Meeting of the European Grassland Federation (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 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 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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