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See detailCyclopentenone prostaglandins at low concetrations exert pro-inflammatory effects through oxidative stress-induced ERK1/2 activation
Bureau, Fabrice ULg; Desmet, Christophe ULg; Mélotte, C. et al

in Proceedings: Spring Meeting of the Belgian Society of Physiology and Pharmacology (2002)

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See detailPhysical metallurgy of a HSS material for hot rolling mill rolls
Lecomte-Beckers, Jacqueline ULg; Tchoufang Tchuindjang, Jérôme; Pirard, Eric ULg et al

in Proceedings of the 14th Rolling Conference - 1st Conference on Uses of Steel (2002)

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

High Speed Steel (HSS) cast rolls are used in front finishing stands of hot strip mills. Good wear resistance and hardness at high temperatures, are defining features of HSS. Many types of carbides are present in these alloys, each having different effect upon their final properties. As a result, nature, morphology and amount of these carbides are factors of important concern. Identification and characterisation of carbides were realised. MC, M2C, M7C3 carbides were found. Some relationships with mechanical properties were obtained especially in the field of the solidification sequence that affects grain size and carbides dispersion. [less ▲]

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See detailAnalytic amplitudes for hadronic forward scattering: COMPETE update
Nicolescu, B.; Cudell, Jean-René ULg; Ezhela, V. V. et al

in Bentvelsen, S.; de Jong, P.; Koch, J. (Eds.) et al ICHEP 2002 (2002)

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See detailStratégies nutritionnelles en vue de promouvoir le dépôt musculaire au détriment du dépôt graisseux : paramètres d'engraissement
Cabaraux, Jean-François ULg; Hornick, Jean-Luc ULg; de Behr, Vanessa et al

in Proceedings of the 7ème Carrefour des Productions Animales (2002)

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See detailInfluence of dietary protein source on fattening parameters of Belgian Blue double muscled cows
Cabaraux, Jean-François ULg; Hornick, Jean-Luc ULg; de Behr, Vanessa et al

in Book of abstracts of the 53rd Annual Meeting of the European Association for Animal Production (2002)

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See detailFire design study case of a high-rise steel storage building
Zaharia, Raoul; Franssen, Jean-Marc ULg

in Proceedings of the International Colloquium on Stability and Ductility of Steel Structures (2002)

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See detailNumerical simulation of cavitation and grain growth during superplastic forming
Ponthot, Jean-Philippe ULg; ADAM, L.

in Proceedings of Plasticity, damage and Fracture at Macro, Micro and Nano Scales (2002)

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See detailChansons liégeoises de conscrits. La mise en page de la voix populaire
Droixhe, Daniel ULg

in Leclerc, M.-D.; Robert, A. (Eds.) Chansons de colportage (2002)

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See detailInventorying urban areas with Very High Resolution Satellite Images
Van de Voorde, Tim; Binard, Marc ULg; Op ’t Eyndt, Tom

in Ramon, J.; Ruiz, M.; Gold, M. (Eds.) Procredings of the 5th AGILE Conference on Geographical Information Science (2002)

Prior to the commercial availability of Very High Resolution (VHR) satellite imagery, the applicability of Earth Observation data in the urban planning sector was very limited. The spatial resolution of ... [more ▼]

Prior to the commercial availability of Very High Resolution (VHR) satellite imagery, the applicability of Earth Observation data in the urban planning sector was very limited. The spatial resolution of the imagery, supplied by platforms like Landsat TM and SPOT HRV, was too coarse to be of real practical use to urban planners and their applications. Satellite images of urban or sub-urban areas are characterized by large radiometric variations due to the small size and the diversity of the objects. This in turn causes a radiometric contamination between neighbouring pixels which renders object recognition nearly impossible. Satellite images with a higher resolution might alleviate this problem. The dawn of the VHR era was thus anticipated with great aspiration by urban remote sensing researchers. In the framework of a DWTC/OSTC Telsat 4 pilot project we proposed a methodology to employ IKONOS-21 imagery to develop an inventory of built-up, and un-built areas in Belgium’s Flemish region. Such an inventory can be of use to regional planning agencies that are responsible for the implementation of the government’s planning policies. In Flanders, AROHM (Administration of Spatial Planning, Housing, Monuments and landscapes) records, monitors, and evaluates the built-up areas. To do this, they need an extensive data input from the communities, which requires a lot of time and effort. A reliable and swift technique, based on earth observation data, and applicable for each residential area in Flanders, would be of great value to them. Not only would it allow them to make swift assessments more frequently, they could also double-check incoming data from the communities. The aforementioned project consisted of three parts: the visual interpretation of two study areas (Hasselt and Ghent), the automatic classification of these areas using both Maximum Likelihood and Neural Network classifiers, and the development of GIS procedures to transform the classified images into thematic maps like, for instance, a map of building densities. [less ▲]

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See detailPinéalomes familiaux : Etudes biologiques et génétiques préliminaires
Allouch, A.; Valdes Socin, Hernan Gonzalo ULg; Hendrick, J. C. et al

in XXème Congrès de la Société Française d'Endocrinologie - Abstract book (2002)

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See detailIntegrating geophysical and tracer test data for accurate solute transport modelling in heterogeneous porous media
Rentier, Céline; Brouyère, Serge ULg; Dassargues, Alain ULg

in Groundwater Quality: Natural and Enhanced Restoration of Groundwater Pollution (GQ’2001) (2002)

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See detailAnalysis of Geological Factors Involved In The Seismic Triggering of Landslides In Kyrgyzstan. Part A: Modelling Ofground Motion Dynamics
Havenith, Hans-Balder ULg; Vanini, M; Jongmans, D et al

in EGS General Assembly Conference Abstracts (2002)

Abstract: The destructive effects of amplified ground motions on hills or mountain crests came first to light by the analysis of structural damage distribution patterns related to strong earthquakes. In ... [more ▼]

Abstract: The destructive effects of amplified ground motions on hills or mountain crests came first to light by the analysis of structural damage distribution patterns related to strong earthquakes. In order to better understand the origin of these so-called topographical effects, many efforts were and are still spent on collecting experimental data and on numerical modelling. Much less attention has, however, been paid to the impact of topographical effects on ground failure, while links between the two are regularly reported. The following ... [less ▲]

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See detailOptical Spectroscopy of Colliding-Wind Systems to be Observed with XMM
Sana, H.; Rauw, Grégor ULg; Gosset, Eric ULg et al

in Interacting Winds from Massive Stars (2002)

Not Available

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See detailSearching for Colliding-Wind Signatures in a Sample of O-Star Binaries
Rauw, Grégor ULg; Sana, H.; Vreux, Jean-Marie ULg et al

in Interacting Winds from Massive Stars (2002)

Not Available

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See detailL'initiation de Télémaque dans l'Odyssée
Renaud, Jean-Michel ULg; Wathelet, Paul ULg

in Hurst, André; Létoublon, Françoise (Eds.) La Mythologie et l'Odyssée. Hommage à Gabriel Germain. Actes du Colloque international de Grenoble, 20-22 mai 1999 (2002)

Ces dernières années, on a souvent décelé, dans les mythes, des traits initiatiques. Il s'agit là d'une possibilité d'explication utile, mais qui doit être maintenue dans des limites précises afin d ... [more ▼]

Ces dernières années, on a souvent décelé, dans les mythes, des traits initiatiques. Il s'agit là d'une possibilité d'explication utile, mais qui doit être maintenue dans des limites précises afin d'éviter des dérives fâcheuses. En ce qui concerne la mythologie grecque, il semble y avoir une tendance à distinguer deux niveaux d'initiation : 1) celle qui intéresse les adolescents qui doivent passer à l'âge adulte; 2) celle qui concerne un certain nombre de personnages extraordinaires. Dans le premier cas, il s'agit pour le jeune homme d'affirmer sa virilité en tuant un gibier, un ennemi ou un monstre redoutables. Il doit agir seul, mais des maîtres d'initiation peuvent lui apporter une aide secondaire et ils doivent juger de la réussite de l'épreuve. Dans le second cas, un être d'exception connaît une épreuve, souvent une mort réelle ou symbolique. S'il réussit l'épreuve, il acquiert une vertu particulière, éventuellement l'immortalité ou un succédané de celle-ci. Au cours de la seconde épreuve, le candidat peut être aidé par une divinité, dont le rôle est plus ou moins important et parfois décisif. Dans le présent article, on a rappelé qu'Ulysse avait successivement remporté le deux épreuves initiatiques, la première dans sa jeunesse en tuant un sanglier redoutable, et la seconde au cours de son périple qui le conduit dans l'autre monde. Examinant le rôle de son fils, Télémaque, particulièrement dans la Télémachie au début de l'Odysse, on est arrivé à la conclusion qu'apparemment Télémaque avait raté la première épreuve (son rôle à l'Assemblée d'Ithaque) et qu'il avait réussi la seconde (son voyage et son séjour à Pylos, puis à Sparte, est présenté comme un voyage dans l'autre monde, une sorte de réduction du périple de son père). [less ▲]

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See detailContribution à la caractérisation de la distribution spatiale des teneurs en éléments traces métalliques dans les sols en région limoneuse belge
Colinet, Gilles ULg; Lacroix, D.; Laroche, J. et al

in Actes des 7ème Journées nationales de l'étude des sols (2002)

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See detailAppetency and preference in horses offered lucerne or chalk as a source of calcium
de Behr, V.; Daron, D.; Cabaraux, Jean-François ULg et al

in Proceedings of the British Society of Animal Science (2002)

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See detailImpact of uranium mining and processing on the environment of mountainous areas of Kyrgyzstan
Torgoev, Isakbek; Aleshyn, U; Havenith, Hans-Balder ULg

in Uranium in the Aquatic Environment (2002)

Abstract: In this report the results of analysis of modern geo-ecological situation in areas of uranium mining and milling in the territory of Kyrgyzstan are presented. Major threats for the mountain ... [more ▼]

Abstract: In this report the results of analysis of modern geo-ecological situation in areas of uranium mining and milling in the territory of Kyrgyzstan are presented. Major threats for the mountain environment and citizens which are connected to mining and processing of the uranium are due to the contamination of the hydrosphere by radio nuclides, and due to the stimulation of dangerous natural and technological processes (landslides, mudflows, destruction of the tailings and dumps) with unfavorable ecological consequences. [less ▲]

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See detailConsequences of t-channel unitarity for the interaction of real and virtual photons at high energies
Martynov, E.; Cudell, Jean-René ULg; Soyez, G.

in Jenkovsky, L.; Fiore, R. (Eds.) DIFFRACTION 2002: INTERPRETATION OF THE NEW DIFFRACTIVE PHENOMENA IN QUANTUM CHROMODYNAMICS AND IN THE S - MATRIX THEORY (2002)

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See detailDe l'image de l'autre à sa représentation : médiation et médiatisation
Servais, Christine ULg

in Trajectoires interculturelles : Représentation et image de l'autre dans le domaine francophone (2002)

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See detailAspects du comique dans le Roman en prose de Guillaume d’Orange
Henrard, Nadine ULg

in Bianciotto, Daniel; Galderisi, Claudio (Eds.) L'épopée romane. Actes du XVe Congrès international Rencesvals (2 vol) (2002)

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See detailIs it safe to design a building structure with simple connections, when they are known to exhibit a semi-rigid behaviour
Braham, M.; Jaspart, Jean-Pierre ULg

in Proceedings of the Third European Conference on Steel Structures (EUROSTEEL) (2002)

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See detailA concrete beam finite element accounting for shear effects
Kaiser, F.; Degée, Hervé ULg

in Proceedings of the 3rd DIANA Conference - Finite Elements in Civil Engineering Applications (2002)

This paper aims at presenting a new beam finite element allowing to simulate the behaviour of structures made of concrete beam structural elements where shear can have a significant effect. An incre ... [more ▼]

This paper aims at presenting a new beam finite element allowing to simulate the behaviour of structures made of concrete beam structural elements where shear can have a significant effect. An incre-mental MCFT-based constitutive law (Modified Compression Field Theory) describes behaviour of concrete. Results obtained by using this element are compared with membrane models and tests results. [less ▲]

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See detailA 3-D Magnetic Vector Potential Formulation Taking Eddy Currents in Lamination Stacks Into Account
Dular, Patrick ULg; Gyselinck, J.; Geuzaine, Christophe ULg et al

in Proceedings of the 10th IEEE Conference on Electromagnetic Field Computation (CEFC'2002) (2002)

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See detailApplication of the Fast Multipole Method to Hybrid Finite Element--Boundary Element Models
V Sabariego, Ruth ULg; Gyselinck, J.; Geuzaine, Christophe ULg et al

in Proceedings of the 2nd international conference on advanced computational methods in engineering, ACOMEN 2002 (2002)

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See detailL'HACCP dans la filière lait.
Belleflamme, Christel ULg; De Schutter, Tine; Sindic, Marianne ULg

in Productions animales et santé humaine. (2002)

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See detailModeling of Thin Insulating Layers in Dual Magnetodynamic Formulations
Dular, Patrick ULg; Geuzaine, Christophe ULg

in Proceedings of the 10th IEEE Conference on Electromagnetic Field Computation (CEFC'2002) (2002)

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See detailDual finite element formulations taking eddy currents in lamination stacks into account
Dular, Patrick ULg; Gyselinck, J.; Geuzaine, Christophe ULg et al

in Proceedings of the 5th Brazilian Conference on Electromagnetics, CBMag 2002 (2002)

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See detailAnalyse de la cessation d'activité en Belgique
Dellis, Arnaud; Desmet, Raphaël; Jousten, Alain ULg et al

in Capital humain et marchés du travail : perspectives régionales et européennes (2002)

L’objectif de cette étude est de montrer l’influence du système de retraite sur la cessation d’activité. La première étape consiste à estimer les incitations financières implicites à ce système et ensuite ... [more ▼]

L’objectif de cette étude est de montrer l’influence du système de retraite sur la cessation d’activité. La première étape consiste à estimer les incitations financières implicites à ce système et ensuite à les introduire comme variables explicatives du départ à la retraite dans une régression de type probit. Le résultat majeur de cette contribution est d’indiquer le rôle significatif de ces incitations sur les décisions individuelles. La seconde étape consiste à utiliser les résultats de cette modélisation pour analyser l’effet de réformes sur la prolongation de l’activité. Il apparaît que l’aménagement de certaines règles d’octroi et de calcul des pensions pourrait inciter les travailleurs âgés à différer l’âge de leur retraite. [less ▲]

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See detailDéficience sévère en hormone de croissance chez les patients non diabétiques avec un microadénome corticotrope : Effets de la chirurgie hypophysaire et implications thérapeutiques
Valdes Socin, Hernan Gonzalo ULg; Laret, V.; de Fays, C. et al

in XXème Congrès de la Société Française d'Endocrinologie - Abstract book (2002)

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See detailDiscussion on “Ultimate Limit State Design of Ship Hulls"
Rigo, Philippe ULg

in SNAME Transactions vol. 110 (2002)

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See detailDevelopment of a multibody model of a sprayer
Ooms, David ULg; Lebeau, Frédéric ULg; Maton, Nicolas et al

in Proceedings of AgEng (2002)

A multibody model of a sprayer boom including the suspension was developed by using ADAMS 11.0 (Mechanical Dynamics). The model was designed with the aim to describe the dynamic behaviour of different ... [more ▼]

A multibody model of a sprayer boom including the suspension was developed by using ADAMS 11.0 (Mechanical Dynamics). The model was designed with the aim to describe the dynamic behaviour of different types of booms and suspensions (double trapezium, trapezium, pendulum, …). This was obtained by creating a general model in which geometrical (dimensions) and mechanical parameters (mass and inertia, friction coefficients, stiffness and damping coefficients of the hinges, …) of the system were easily modified. A graphical interface especially designed authorised this easy modification. The validation of the model was obtained by measuring in real conditions the frame movements as solicitations and the boom movements as responses. The method was applied on a trailed sprayer equipped with a boom of 24 m and a trapezoidal suspension. Good accordance was found between measured and simulated vertical displacements. The model may decrease the development costs of suspension and boom designs. [less ▲]

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See detailMapping within-field soil variability for precision agriculture using electromagnetic induction
Hanquet, Bernard; Frankinet, Marc; Parez, Vincent et al

in Proceedings of AgEng (2002)

Among the crops production factors, the soil is obviously one of the most important. Therefore, within the context of Precision Agriculture, the spatial variability knowledge of its physical and chemical ... [more ▼]

Among the crops production factors, the soil is obviously one of the most important. Therefore, within the context of Precision Agriculture, the spatial variability knowledge of its physical and chemical properties is essential as a decision support information for cultural operations modulation. The purpose of this study is to assess the capability of electromagnetic induction sensing of apparent electrical conductivity (ECa) for the characterisation of withinfield variability of soil physical and/or chemical properties in the particular soil conditions encountered in our experimental area, namely non-saline deep silty soils. ECa maps were produced on a 7ha field in April 2001, September 2001 and April 2002. Concurrently, an intensive soil survey (112 points) was carried out in February 2001 in order to determine a series of physical, textural and chemical soil parameters. ECa accurately described clay content, and exchangeable K and Ca cations concentrations. [less ▲]

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See detailApplication of image analysis to the identification and rating of road surface distress
Rasse, Catherine; Leemans, Vincent ULg; Destain, Marie-France ULg et al

in Correia; Branco (Eds.) Bearing Capacity of Roads, Railways and Airfields (2002)

Numerical image analysis is used to detect narrow cracks on bituminous pavement. This problem is complicated because of the variable road aspect, which depends on coarseness textures, changing ambient ... [more ▼]

Numerical image analysis is used to detect narrow cracks on bituminous pavement. This problem is complicated because of the variable road aspect, which depends on coarseness textures, changing ambient lighting, presence of humidity and because of the poor contrast of the cracks with regard to road texture. The paper presents algorithms suited to detect random cracks edges in a noisy environment in three stages. The pre-treatment consisted mainly in applying a background correction to eliminate the heterogeneity due to humidity, shade, ... In the treatment, a threshold value was applied to segment the 'object' from the rest of the image. As these objects may be cracks, part cracks, or some noise erroneously segmented as defect, a post-treatment was applied to appreciate more accurately if a pixel belonged to an object or to the background. It aimed also to assembly parts of the cracks in continuous structure. When compared to visual detection, efficient detection of cracks is obtained. Further work needs to be done to get an automatic detection of the cracks whatever the road texture. [less ▲]

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See detailTeaching operational pedology in an agricultural university.
Bock, Laurent ULg

in 17th World Congress of Soil Science, Bangkok, Thailand, 14-20 August2002 (2002)

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See detailSpray controller for horizontal boom movements compensation
El Bahir, Loussain; Lebeau, Frédéric ULg; Destain, Marie-France ULg et al

in Proceedings of AgEng2002 (2002)

Longitudinal spray distribution is mainly affected by the horizontal speed variations of the nozzles. Manufacturers classically try to reduce unwanted nozzles movements using horizontal boom suspension ... [more ▼]

Longitudinal spray distribution is mainly affected by the horizontal speed variations of the nozzles. Manufacturers classically try to reduce unwanted nozzles movements using horizontal boom suspension but these methods show performance and price limitations. The purpose of this paper is to propose a spray controller aiming to compensate the effect of the horizontal boom movements on the spray distribution besides the effect of tractor speed variations. The controller is based on three main parts: a control law describing the relationship between nozzle speed, nozzle flow and spray coverage; a real time measurement of the boom horizontal speed variations using micro-machined capacitive accelerometers and Pulse Width Modulation (PWM) no zzle flow actuators. A prototype was developed using a processor board controller (dSpace) and tested on a laboratory test bench. The nigrosine solution spray coverage was measured using image analysis for field representative multi-sine nozzle speed variations. The spray coverage uniformity using the spray controller showed about 51% compensation of the spray coverage variations observed without controller. [less ▲]

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See detailA steel beam element accounting for the cross section deformation
Degée, Hervé ULg

in Proceedings of the 3rd DIANA World Conferences - Finite Elements in Civil Engineering Applications (2002)

Classical beam elements are based on the assumption that the cross section of the element re-mains unchanged during the entire loading. However, this can be too simple for modeling the behavior of thin ... [more ▼]

Classical beam elements are based on the assumption that the cross section of the element re-mains unchanged during the entire loading. However, this can be too simple for modeling the behavior of thin-walled steel profiles, where local and distortional buckling are likely to occur. In this perspective, a spe-cial element taking into account the deformation of the cross section is presented and some examples of com-putations of critical bifurcation loads are presented. [less ▲]

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See detailBLUPF90 and related programs (BGF90)
Misztal, I.; Tsuruta, S.; Strabel, T. et al

in Proceedings from the 7th World Congress on Genetics Applied to Livestock Production (2002)

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See detailFormadis : soutien au déploiement de formations ouvertes et à distance, en Wallonie et à Bruxelles
Dupont, Chantal ULg; Poumay, Marianne ULg; Georges, François ULg et al

(2002)

This paper presents an initiative, FORMADIS, aiming at producing a critical mass of quality courses and thus, contributing to the dissemination of good practices in ODL. A competitive call has been ... [more ▼]

This paper presents an initiative, FORMADIS, aiming at producing a critical mass of quality courses and thus, contributing to the dissemination of good practices in ODL. A competitive call has been launched in 2001 and 2002 to select 23 projects to be closely coached and turned into on-line active courses. The teachers, by working on their own course with the support of instructional, technical and graphic specialists move from a traditional way of considering their course to a more open view of what it could be. Applying the principles of isomorphism and transfer, the teacher training program in pedagogy, partly on line and partly face to face, helps in the different stages of development of the course. As anticipated, this setting appears to be an effective way to provide continuing education to teachers. The produced courses illustrate the diversity of implemented strategies and the added-value due to ODL. Over 40 activities have been described and analysed, according to the “7 teaching/learning paradigms” model. [less ▲]

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See detailModeling the Martian ionosphere using the Total Electron Content measurement by the NEIGE/NETLANDER experiment
Morel, Laurent; Witasse, Olivier; Warnant, René ULg et al

in Proceedings of the XXVII URSI General Assembly (2002)

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See detailPotential of the NDSC in support of the Kyoto Protocol: Examples from the station Jungfraujoch, Switzerland
Zander, Rodolphe ULg; Mahieu, Emmanuel ULg; Servais, Christian ULg et al

in Van Ham, J.; Baede, A. P. M.; Guicherit, R. (Eds.) et al Non-CO2 Greenhouse Gases: Scientific Understanding, Control Options and Policy Aspects (2002)

This paper gives a brief description and “raison d’être” of the Network for the Detection of Stratospheric Change (NDSC) as well as its key research tasks to address the broader goal of monitoring ... [more ▼]

This paper gives a brief description and “raison d’être” of the Network for the Detection of Stratospheric Change (NDSC) as well as its key research tasks to address the broader goal of monitoring atmospheric changes and to identify their causes and related impacts on mankind’s environment. While the Network has primarily focussed, thus far, on monitoring the ozone layer and assessing global compliance with the Montreal Protocol, ongoing implementations and new capabilities have enabled it to adapt to more recent political developments such as the Kyoto Proto-col on substances affecting the climate system. Examples of activities in support of the latter are reported, based on infrared solar observations at the Jungfraujoch station. [less ▲]

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See detailLe voyage en train et en images. Une expérience photographique de la discontinuité et de la fragmentation
Mélon, Marc-Emmanuel ULg

in Albéra, François; Braun, Marta; Gaudreault, André (Eds.) Arrêt sur image et fragmentation du temps. Cinématographie, kinétographie, chronophotographie (2002)

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See detailThe Valence Quark Distribution of the Pion
Lansberg, Jean-Philippe ULg; Bissey, F.; Cudell, Jean-René ULg et al

in Dong Su; Burchat, Patricia (Eds.) XXII Physics in Collision Conference (PIC02) (2002)

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See detailBien-être animal: les apports de l'Ethologie.
Vandenheede, Marc ULg

in Journée d'étude Bien-être des porcs et des volailles (2002)

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See detailEthanol-conditioned withdrawal syndrome
Quertemont, Etienne ULg; De Witte, Philippe

in Proceedings of the 22nd European Winterconference on Brain Research (2002)

The withdrawal syndrome is closely related to the concepts of tolerance and physical dependence. The chronic consumption of a drug is believed to induce adaptive changes that are designed to oppose the ... [more ▼]

The withdrawal syndrome is closely related to the concepts of tolerance and physical dependence. The chronic consumption of a drug is believed to induce adaptive changes that are designed to oppose the acute effects of the drug. Such adaptive changes increase the tolerance to acute drug effects but lead to physical dependence, which is revealed by withdrawal symptoms when the drug is cleared from the body. However, another form of adaptive response to repeated drug consumption has been identified. This adaptive response appears after the intermittent repeated administration of a drug in association with the same set of environmental stimuli. After several associations, these environmental stimuli become able to induce a conditioned adaptive response. Such response leads to the phenomenon of “environment-dependent tolerance” that was observed with many drugs of abuse. However, if the drug is not administered, the conditioned stimuli alone may induce a “conditioned withdrawal syndrome”. Although less studied than the classical withdrawal syndrome, this conditioned withdrawal syndrome may be of importance for the development of drug dependence. In our experiments, we have studied the development of a conditioned withdrawal syndrome after repeated associations of a specific set of environmental stimuli with ethanol injections in Wistar rats. After repeated administrations of ethanol, the rats showed a clear environmental-dependent tolerance to ethanol. Furthermore, these conditioned stimuli induced behavioral (hyperexcitation) and neurochemical (increase glutamate release) responses similar to those observed after chronic alcohol withdrawal. [less ▲]

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See detailLinear and nonlinear thermal instability of a rotating saturated porous medium heated from below
Desaive, Thomas ULg; Hennenberg, M.; Lebon, Georgy ULg

in 1st international conference on applications of porous media (2002)

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See detailRepairing Concrete with Self Compacting Concrete: Testing Methodology Assessment
Courard, Luc ULg; Darimont, Anne ULg; Degeimbre, Robert ULg et al

in Shah, S. P. (Ed.) Self-Consolidating Concrete (2002)

The repair of concrete deck slabs or balcony needs a special composition of concrete and self-compacting concrete (SCS) is advantageously used for such repair operation in comparison with patch repair or ... [more ▼]

The repair of concrete deck slabs or balcony needs a special composition of concrete and self-compacting concrete (SCS) is advantageously used for such repair operation in comparison with patch repair or gunite. Two compositions of concrete (classical and SCC concretes) and two repair mortars are tested according to a new testing procedure. The penetration of SCC beneath the concrete plate structure but also the adhesion to the old concrete substrate are analysed. The rheology of the material is measured by means of usual tests and rheometer. The different materials have been characterised through physical, chemical and mechanical test program. Two types of applications (vertical and horizontal) are presented and commented. Analysis of the interface between concrete substrate and SCC is given on the base of pull-off test and microscopical observations. [less ▲]

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See detailMicroscopic identification of complex MC, M2C, M7C3, M6C and M23C6 carbides in high-speed steels
Tchuindjang, Jérôme Tchoufack ULg; Lecomte-Beckers, Jacqueline ULg

in Proceedings of The International Conference Joint Microscopic Meeting (2002)

High-speed steels (HSS) rolls are used in front finishing stands of hot strip mills. Good wear resistance and hardness at high temperature are defining features of HSS. Many types of carbides are present ... [more ▼]

High-speed steels (HSS) rolls are used in front finishing stands of hot strip mills. Good wear resistance and hardness at high temperature are defining features of HSS. Many types of carbides are present in these alloys, each having different effect upon the final properties of HSS. As a result, nature, morphology and amount of these carbides are factors of important concern. Identification and characterisation of HSS carbides were realised with optical microscopy combined with electron microscopy. [less ▲]

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See detailAnalytical study of the interaction between bending and axial force in bolted joints
Boissonnade, N.; Jaspart, Jean-Pierre ULg; Muzeau, J. P. et al

in Proceedings of the Third European Conference on Steel Structures (EUROSTEEL) (2002)

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See detailGénéalogie de la peinture de paysage au XVIe siècle
Allart, Dominique ULg

in Toussaint, Jacques (Ed.) Autour de Henri Bles (2002)

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See detailImplicit-explicit time integration algorithms for the numerical simulation of blade-casing interactions
Noels, Ludovic ULg; Stainier, Laurent ULg; Ponthot, Jean-Philippe ULg et al

in Rajendran, A. M.; Jones, B. N.; Brebbia, C. A. (Eds.) Structures under Shock and Impact VII (2002)

In order to solve fast dynamic problems, an explicit method is the most adapted. But for slower dynamics, an implicit method is more stable. Typical industrial problems are governed by high frequency, e.g ... [more ▼]

In order to solve fast dynamic problems, an explicit method is the most adapted. But for slower dynamics, an implicit method is more stable. Typical industrial problems are governed by high frequency, e.g. impact, during short time intervals and slower dynamics, e.g. spring-back, during other time intervals. The optimal solution is then to have both implicit algorithm and explicit methods readily available in the same code and to be able to switch automatically from one to the other. Criteria that decide when to shift from a method to another have been developed here. Implicit balanced restarting conditions that annihilate numerical oscillations resulting for an explicit calculation are also proposed. [less ▲]

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See detailNumerical simulation of the solidification of a beam blank in the mould
Hubsch, P.; Bourdouxhe, M.; Pascon, Frédéric ULg et al

in Proceedings of the 4th European Continuous Casting Conference (2002)

The stability of the casting process and the wear of the mould as well as the quality of the product depend strongly on the mould design. This is particularly true when considering the production of beam ... [more ▼]

The stability of the casting process and the wear of the mould as well as the quality of the product depend strongly on the mould design. This is particularly true when considering the production of beam blanks. If the mould is too tight, thermal contraction can generate considerable contact forces between the product and the mould on the inner surfaces of the flanges. If it is not tight enough, the thermal coupling between the mould and the beam blank is not sufficient to allow the solidification of a skin of the required thickness upon exit from the mould. A finite element model was developed to assist in the mould design. This model takes both the thermal and mechanical interaction between the mould and the product into account. The effect of solidification is implicitly included in the (thermal) finite element formulation while the ferro-static pressure is applied by the means of a specially developed element. The model was applied to a medium gage beam blank cast at ProfilARBED Differdange. The skin thickness as well as the localisation of the wear of the mould predicted by the model are in good agreement with observations made in industrial practice. [less ▲]

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See detailChronique de jurisprudence. Les contrats. Le contrat d'entreprise et la loi Breyne
Kohl, Benoît ULg

in Chroniques du droit à l'usage du notariat (2002)

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See detailIngestion and metabolic profile in horses offered lucerne or chalk as a source of calcium
de Behr, V.; Daron, D.; Gabriel, Annick ULg et al

in Proceedings of the British Society of Animal Science (2002)

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See detailLine-Profile Variability in the Massive Binary System HD 149404
Nazé, Yaël ULg; Carrier, Fabien; Rauw, Grégor ULg

in Interacting Winds from Massive Stars (2002)

Not Available

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See detailChronique de jurisprudence. Les contrats. Le mandat.
Kohl, Benoît ULg

in Chroniques du droit à l'usage du notariat (2002)

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See detailDaily management of the transition to the future.
Goffinet, Nathalie ULg; Delvenne, Catherine ULg; Chalon, Patrice ULg et al

in Proceedings of the 8th European Conference of medical and Health Libraries, Köln, Septembre 16-21, 2002. (2002)

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See detailOn the construction of the inclusion boundary neighbourhood for markov equivalence classes of bayesian network structures
Auvray, Vincent; Wehenkel, Louis ULg

in Proceedings of Uncertainty in Artificial Intelligence (2002)

The problem of learning Markov equivalence classes of Bayesian network structures may be solved by searching for the maximum of a scoring metric in a space of these classes. This paper deals with the ... [more ▼]

The problem of learning Markov equivalence classes of Bayesian network structures may be solved by searching for the maximum of a scoring metric in a space of these classes. This paper deals with the definition and analysis of one such search space. We use a theoretically motivated neighbourhood, the inclusion boundary, and represent equivalence classes by essential graphs. We show that this search space is connected and that the score of the neighbours can be evaluated incrementally. We devise a practical way of building this neighbourhood for an essential graph that is purely graphical and does not explicitely refer to the underlying independences. We find that its size can be intractable, depending on the complexity of the essential graph of the equivalence class. The emphasis is put on the potential use of this space with greedy hillclimbing search. [less ▲]

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See detailL’HACCP dans la filière lait.
Belleflamme, Christel ULg

in Septième Carrefour des Productions animales : Productions animales et santé humaine. (2002)

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See detailLa "question de l'orthographe" wallonne
Boutier, Marie-Guy ULg

in micRomania (Ed.) Ecrire les langues d'oïl (2002)

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See detailDesign of the Heliospheric Imager for the STEREO mission
Defise, Jean-Marc ULg; Halain, Jean-Philippe ULg; Mazy, Emmanuel ULg et al

in Society of Photo-Optical Instrumentation Engineers (SPIE) Conference Series (2001, December 01)

The Heliospheric Imager (HI) is part of the SECCHI suite of instruments on-board the two STEREO spacecrafts to be launched in 2005. The two HI instruments will provide stereographic image pairs of solar ... [more ▼]

The Heliospheric Imager (HI) is part of the SECCHI suite of instruments on-board the two STEREO spacecrafts to be launched in 2005. The two HI instruments will provide stereographic image pairs of solar coronal plasma and address the observational problem of very faint coronal mass ejections (CME) over a wide field of view (~90 degree(s)) ranging from 13 to 330 R[SUB]0[/SUB]. The key element of the instrument design is to reject the solar disk light, with straylight attenuation of the order of 10[SUP]-13[/SUP] to 10[SUP]-15[/SUP] in the camera systems. This attenuation is accomplished by a specific design of straylight baffling system, and two separate observing cameras with complimentary FOV's cover the wide FOV. A multi-vane diffractive system has been theoretically optimized to achieve the lower requirement (10[SUP]-13[/SUP] for HI-1) and is combined with a secondary baffling system to reach the 10[SUP]-15[/SUP] rejection performance in the second camera system (HI-2). This paper presents the design concept of the HI optics and baffles, and the preparation of verification tests that will demonstrate the instrument straylight performances. The baffle design has been optimized according to accommodation constrains on the spacecraft, and the optics were studied to provide adequate light gathering power and image quality. Straylight has been studied in the complete configuration, including the lens barrels and the focal plane assemblies. A specific testing facility is currently being studied to characterize the effective straylight rejection of the HI baffling. An overview of the developments for those tests is presented. [less ▲]

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See detailChandra/ACIS observation of NGC 346
Nazé, Yaël ULg; Stevens, I. R.; Hartwell, J. et al

in Bulletin of the American Astronomical Society (2001, December 01)

The cluster NGC346 is the largest star formation region in the SMC. It contains a large fraction of the early-type O stars of this galaxy. In the outskirts of this cluster lies HD 5980, a unique system of ... [more ▼]

The cluster NGC346 is the largest star formation region in the SMC. It contains a large fraction of the early-type O stars of this galaxy. In the outskirts of this cluster lies HD 5980, a unique system of massive stars of which one component underwent a LBV-type eruption in 1993. The XMEGA consortium has obtained one deep (100 ks) Chandra exposure of NGC 346. It shows ~70 point sources, of which only half possess an optical counterpart; strong emission from HD 5980; and diffuse emission associated with the cluster and SNR 0057-7226. [less ▲]

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See detailGlobal analysis of a continuous-time flow whith computes time-optimal switchings
Grognard, F.; Sepulchre, Rodolphe ULg

in Proceedings of the 40th IEEE Conference on Decision and Control (2001, December)

The minimum-time bounded control of linear systems is generically bang-bang and the number of switchings does not exceed the dimension of the system if the eigenvalues of the system matrix are real. This ... [more ▼]

The minimum-time bounded control of linear systems is generically bang-bang and the number of switchings does not exceed the dimension of the system if the eigenvalues of the system matrix are real. This paper proposes a synthesis method for such problems based on dynamical systems that "compute" the optimal sequence of switching times. [less ▲]

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See detailMulticriteria and multiactors interactive tool aiding to sketch the building envelope during the first stages of the architectural design, with objective of cost and energy performances
Hauglustaine, Jean-Marie ULg

in Performance of Exterior Envelopes of Whole Buildings VIII: Integration of Building Envelopes (2001, December)

The present study explores a Multiple Criteria Decision Aid (MCDA) procedure, an aid to help project authors optimise the building envelope during the sketch design, where a significant number of choices ... [more ▼]

The present study explores a Multiple Criteria Decision Aid (MCDA) procedure, an aid to help project authors optimise the building envelope during the sketch design, where a significant number of choices are fixed, having a determining impact on the future building cost and use. The objective of the design method is the respect of building costs – for the building construction and use – and the energy performance improvement. An interactive tool has been developed within multicriteria and multiactors context. In order to improve the architectural response to the client’s and regulation requirements, it gives decision-making aids to: - the project authors: in making up the project architectural forces, in accordance with the actors’ objectives; - the client: in reaching his objectives of costs, building duration, comfort and functionality, while serenely assuming his responsibilities related to his building energy and environment performances. The design tool is organised in two linked modules, any actor may go in any module in any time: - the first one manages parameters describing the project requirements; - the graphic module allows to draw the sketch; it calculates geometric parameter values that it puts back in the first module. Permanently informed on cost and energy performances, the user can any time search for optimal scenario giving best satisfaction or compromise: he has at his disposal at lot of graphs illustrating the performance sensitivity to parameter variation, as well as an optimisation procedure using a genetic algorithm to find the most efficient parameter set. The software is organised to manage new building projects of housings, schools and offices (small to medium size projects). [less ▲]

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See detailDe bijdrage van de organisatiesociologie tot het begrijpen van het functioneren van justitie
Schoenaers, Frédéric ULg

in toekomst van rechtssociologie in het justitiële beleid (2001, December)

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See detailImpact studies and water management with WolfHydro : a new physically based hydrological solver
Archambeau, Pierre ULg; Mouzelard, Thibaut; Erpicum, Sébastien ULg et al

in International Symposium on Environmental Hydraulics (2001, December)

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See detailSynthesis of 2-Diethoxyphosphoryl-2-Methyl-5-Phenyl-3,4-Dihydro-2H-Pyrrole-1-Oxide (DEPMPO-Ph): a New Radical Spin-Trap
Olive, Gilles ULg; Le Moigne, François; Mercier, Anne et al

in Symposium Drug Discovery Strategies: from Leads to Drugs (2001, November 16)

The synthesis of a new radical spin trap is presented here: the 2-Diethoxyphosphoryl-2-Methyl-5-Phenyl-3,4-Dihydro-2H-Pyrrole-1-Oxide (DEPMPO-Ph)

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See detailThe influence of gas depth on interfacial convection in a liquid gas bilayer.
Narayanan, Ranga; Theisen, Eric; Johnson, Duane et al

in Bulletin of the American Physical Society, Proceedings of the 54th Annual Meeting of the APS Division of Fluid Dynamics (2001, November 01)

We present a study of the influence of air height on the pattern formation at the onset of interfacial convection in a liquid -gas bilayer. Bilayer convection results from interaction of two immiscible ... [more ▼]

We present a study of the influence of air height on the pattern formation at the onset of interfacial convection in a liquid -gas bilayer. Bilayer convection results from interaction of two immiscible, superposed fluid layers and it is a transport problem that is affected by the ratios of various thermophysical properties and geometries. By using both calculations and experiments, a new convection-coupling mechanism is revealed. When the gas depth is low the convection is dominant in the liquid. It is of the Rayleigh Marangoni type and subcritical convection may be seen for axisymmetric patterns at the onset. For large gas heights the convection in the upper fluid layer simultaneously generates transverse thermal gradients along the fluid-fluid interface immediately causing surface tension gradient and buoyancy driven-convection in the lower fluid. The convection in the gas is of the Rayleigh type and the self-adjoint nature of the mathematical problem is depicted in the experiment wherein no subcritical motion occurs. In both the calculations and the experiment, silicone oil and air were used as the two fluids. As the viscosity of air is quite low compared to the silicone oil, convection in the air has no mechanical influence on the silicone oil and it is this property that is advantageous in isolating the new convection mechanism. The correspondence between theory and experiment is excellent. [less ▲]

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See detailH[SUB]2[/SUB] temperature and self-absorption: analysis of Jovian auroral spectra obtained with the FUSE satellite
Gustin, Jacques ULg; Feldman, P. D.; Gérard, Jean-Claude ULg et al

in Bulletin of the American Astronomical Society (2001, November 01)

High-resolution spectra of the Jovian aurora have been obtained with unprecedented spectral resolution in the 900-1190 Ì· window with the the Far Ultraviolet Spectroscopic Explorer (FUSE), using the 30 ... [more ▼]

High-resolution spectra of the Jovian aurora have been obtained with unprecedented spectral resolution in the 900-1190 Ì· window with the the Far Ultraviolet Spectroscopic Explorer (FUSE), using the 30"x30" LWRS aperture. All observed features belong to the H[SUB]2[/SUB] transitions from the B, C, B', D, B" and D' electronic states to the ground-state. These emissions are excited by inelastic collisions of the primary and secondary auroral electrons with H[SUB]2[/SUB] molecules. The relative intensity distribution of the observed lines depends on the rotational temperature of the emitting layer and self-absorption. Below 1100 Ì· , the transitions leading to the v" = 0, 1 and 2 levels of ground-state are partially or totally absorbed by H[SUB]2[/SUB], giving indications about the vibrational H[SUB]2[/SUB] distribution and overlying column. After a validation with an unabsorbed and a self-absorbed laboratory spectrum obtained in controlled conditions (100K, 300 eV), this study compares the observations and synthetic spectra, generated by a code including the B, C and B', D, B" and D' Rydberg states. The rotational and vibrational H[SUB]2[/SUB] temperatures are determined as well as the overlying H[SUB]2[/SUB] column. The combination of these parameters is used to determine the depth of the auroral energy deposition. This work is based on data obtained for the Guaranteed Time Team by the NASA-CNES-CSA FUSE mission operated by the Johns Hopkins University. French participants are supported by CNES. Financial support to U.S. participants has been provided by NASA contract NAS5-32985. [less ▲]

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See detailBiosystems Engineering: Applying methods from systems theory to biological systems
Kremling, A.; Sauter, T.; Bullinger, Eric ULg et al

in Proc. of the 3rd International Conference on Systems Biology (2001, November)

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See detailAbdomen aigu: aspects chirurgicaux
Hamaide, Annick ULg

in Proceedings du congrès CNVSPA (2001, November)

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See detailPathologies surrénaliennes
Peeters, Dominique ULg; Remy, Isabelle ULg

in Proceedings du congrès CNVSPA-SAVAB (2001, November)

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See detailGravitational lensing studies with the 4-m International Liquid Mirror Telescope (ILMT) (poster contribution)
Jean, C.; Claeskens, Jean-François ULg; Surdej, Jean ULg

in Brainerd, T. G.; Kochanek, C. S. (Eds.) Proceedings of the Conference "Gravitational lensing: recent progress and future goals" (2001, October 01)

A 4-m International Liquid Mirror Telescope (ILMT) is being built in the north of Chile by an international consortium and will become operational in two years from now. We present here a short ... [more ▼]

A 4-m International Liquid Mirror Telescope (ILMT) is being built in the north of Chile by an international consortium and will become operational in two years from now. We present here a short description of the telescope as well as estimates of the microlensing, macrolensing and weak lensing effects expected from a deep, multicolor imaging survey made with such a telescope. [less ▲]

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See detailCrestar® and PMSG don't affect systemic insulin-like growth factor-I but induce oestrus in postpartum suckling dromedary females.
Hammadi, M.; Khorchani, T.; Moslah, M. et al

in Proceedings of the 4th International Conference on Farm Animal Endocrinology (2001, October)

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See detailL'imaginaire de l'objet
Delville, Michel ULg

in Watthee-Delmotte, Myriam (Ed.) Texte, image, Imaginaire (2001, October)

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See detailSuivi du procédé de séchage thermique de boues d'épuration par microtomographie aux rayons X
Léonard, Angélique ULg; Blacher, Silvia ULg; Marchot, Pierre ULg et al

in Latifi, A.; Boudrant, J.; Tonde, J. (Eds.) Récents progrès en génie des procédés N°82 Vol.15 2001 : information, modélisation, simulation et optimisation (2001, October)

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See detailBeta-agonist administration followed by dexamethasone treatment differently alters somatotropic and thyroid axis.
Renaville, Robert ULg; Parmentier, Isabelle; Haezebroeck, Valérie et al

in Proceedings of the 4th International Conference on Farm Animal Endocrinology (2001, October)

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See detailThe role of the somatotropic axis in the mammalian metabolism
Renaville, Robert ULg; Parmentier, Isabelle; Haezebroeck, Valérie et al

in Proceedings of the 4th International Conference on Farm Animal Endocrinology (2001, October)

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See detailQuantification of bST in milk by electrochemiluminescence: a way for detection of treated cows.
Renaville, Robert ULg; Deaver, D.; Baronheid, Christophe et al

in Proceedings of the 4th International Conference on Farm Animal Endocrinology (2001, October)

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See detailTopology optimization with self-weight loading: (un-expected) problems and solutions
Bruyneel, Michaël ULg; Duysinx, Pierre ULg

in Bendsoe, M. P.; Olhoff, Niels; Rassmussen, John (Eds.) Proceedings of the 2nd Max Planck Workshop on Engineering Design Optimization (2001, October)

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See detailRIA method for plasma insulin-like growth factor-binding protein-3 quantification in cattle at various physiological situations.
Renaville, Robert ULg; Parmentier, Isabelle; Fontaine, Sandrine et al

in Proceedings of the 4th International Conference on Farm Animal Endocrinology (2001, October)

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See detailEffects of peripartum dietary supplements on productive/reproductive parameters, and plasma concentration of Insulin-like growth factor (IGF)-I in camels.
Hammadi, M.; Khorchani, T.; Moslah, M. et al

in Proceedings of the International Twin Conference on Reproduction/Production in Camelids. (2001, October)

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See detailLe froment d'hiver
Bodson, Bernard ULg; Vancutsem, Françoise ULg; Couvreur, Luc et al

in Livre Blanc: Céréales - Gembloux - Informations avant les semis (2001, September 13)

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See detailEscourgeon et Orge d'hiver fourragers
Herman, Jean-Luc; Couvreur, Luc; Monfort, Bruno et al

in Livre Blanc: Céréales - Gembloux - Informations avant les semis (2001, September 13)

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See detailAperçu de la qualité des froments d'hiver en 2001
Sinnaeve, Geoges; Herman, Jean-Luc; Couvreur, Luc et al

in Livre Blanc: Céréales - Gembloux - Informations avant les semis (2001, September 13)

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See detailMesures agri-environnementales (MAE) en froment d'hiver
Couvreur, Luc; Bodson, Bernard ULg; Vancutsem, Françoise ULg et al

in Livre Blanc: Céréales - Gembloux - Informations avant les semis (2001, September 13)

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See detailSynthesis of Pd/SiO2, Ag/SiO2 and Cu/SiO2 catalysts by sol-gel process : study of metal dispersion and nucleation phenomenon
Lambert, Stéphanie ULg; Ferauche, Fabrice; Heinrichs, Benoît ULg et al

in CD-ROM of full abstracts of the 2nd International Conference on Silica Science and Technology, SILICA 2001 (4 p.) (2001, September 03)

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See detailA Time-Scale Decomposition-Based Simulation Tool for Voltage Stability Analysis
Loud, Lester; Rousseaux, Patricia ULg; Lefebvre, Daniel et al

in Proceedings of the IEEE Porto Power Tech Conference (2001, September)

This paper proposes a time domain simulation tool combining Full Time Scale (FTS) simulation in the short-term period following a contingency and Quasi Steady-State (QSS) approximation for the long-term ... [more ▼]

This paper proposes a time domain simulation tool combining Full Time Scale (FTS) simulation in the short-term period following a contingency and Quasi Steady-State (QSS) approximation for the long-term phase. A criterion is devised to automatically switch from FTS to QSS simulation as soon as sufficient damping of short-term dynamics is reached. Various comparisons with FTS simulations have been performed on the Hydro-Qn6bec system. The proposed method is shown to combine accuracy of FTS with computational efficiency of QSS. Sensitivity of simulations to load model and the need for updating the whole model with frequency variations are also discussed. [less ▲]

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See detailA Test Cryostat for Herschel-PACS Mechanism
Renotte, Etienne ULg; Barzin, Pascal ULg; Guiot, Marc ULg et al

in SCHÜRMANN B. (Ed.) ESA-SP-467 (2001, September)

The PACS Grating Assembly consists of a flat ruled grating of 320x80 mm²; its positioning mechanism; and launch-locking system. The Grating Assembly is part of the PACS Focal Plane Unit (FPU) and is ... [more ▼]

The PACS Grating Assembly consists of a flat ruled grating of 320x80 mm²; its positioning mechanism; and launch-locking system. The Grating Assembly is part of the PACS Focal Plane Unit (FPU) and is operated at liquid helium temperature (4K). It is remote-controlled from the Detector & Mechanism Controller (DEC/MEC), which is located on the Herschel Service Module. The grating shall be capable of accurate positioning (4 arcsec) within a large angular throw (40 arcdeg) and restricted dissipation to the 4K heat sink (< 5 mW). The development of the Grating mechanism controller has urged the need for a cryogenic simulator of the Grating Assembly with regard to the large change in value of mechanical and electrical characteristics between room temperature and liquid helium temperature. The simulator consists of a functional prototype of the Grating Assembly and a dedicated helium cryostat with appropriate interfaces. The test cryostat is a homemade facility (CSL) designed to cool down the prototype (and subsequent models) to liquid helium temperature. The test set-up also provides relevant instrumentation such as cryogenic temperature read-out, electrical feedthroughs toward the payload and optical viewport. [less ▲]

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See detailExperimental identification of a non-linear beam, conditionned reverse path method
Kerschen, Gaëtan ULg; Lenaerts, Vincent; Golinval, Jean-Claude ULg

in International Conference on Structural Systems Identification, Kassel, 2001 (2001, September)

A new spectral approach for identification of multi-degree-of-freedom nonlinear systems, called the conditioned reverse path method, has recently been introduced. The key idea of this method is to ... [more ▼]

A new spectral approach for identification of multi-degree-of-freedom nonlinear systems, called the conditioned reverse path method, has recently been introduced. The key idea of this method is to eliminate the distortions caused by the presence of non-linearities in frequency response functions. Conditioned frequency responses are then computed and yield the underlying linear properties without influence of non-linearities. The non-linear coefficient is estimated in a second step. The aim of the paper is twofold. Firstly, the conditioned reverse path method is described in details together with the spectral conditioning techniques. Secondly, the ability of this technique to identify the behaviour of an experimental cantilever beam with a geometrical non-linearity is tested. [less ▲]

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See detailUse of X-ray microtomography to follow the convective heat drying of wastewater sludges
Léonard, Angélique ULg; Blacher, Silvia ULg; Marchot, Pierre ULg et al

in Proceedings of the 6th World Congress of Chemical Engineering (2001, September)

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See detailA Module-Oriented Optimization Tool
Rigo, Philippe ULg

in PRADS’2001, 8th Int. Symposium on Practical Design of Ships and other Floating Structures,vol 1 (2001, September)

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See detailSensitivity Analysis on Ultimate Hull Bending Moment
Rigo, Philippe ULg; Toderan, C.; Yao, T.

in PRADS’2001, 8th Int. Symposium on Practical Design of Ships and other Floating Structures, vol.2 (2001, September)

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See detailUltimate Strength of Longitudinally Stiffened Panels: Multi-Criteria Comparative Analysis
Rigo, Philippe ULg; Pradillon, J. Y.; Quesnel, T. et al

in PRADS’2001, 8th Int. Symposium on Practical Design of Ships and other Floating Structures, vol.2 (2001, September)

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See detailLoad Shedding Controllers against Voltage Instability: a comparison of designs
Moors, Cedric; Lefebvre, Daniel; Van Cutsem, Thierry ULg

(2001, September)

This paper discusses and compares three types of undervoltage load shedding closed-loop controllers in terms of performances and design computational effort. We first describe the various controllers and ... [more ▼]

This paper discusses and compares three types of undervoltage load shedding closed-loop controllers in terms of performances and design computational effort. We first describe the various controllers and identify the parameters to be optimized. Next, we present an optimization methodology applicable to all three types of controllers. This approach allows to find the controller parameters which optimize an overall performance objectiw. Results are presented on the Hydro-Qukbec system, in which load shedding is presently planned. [less ▲]

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See detailOnline Flight Flutter Testing
Dimitriadis, Grigorios ULg; Cooper, Jonathan E

in Link, M. (Ed.) Proceedings of the International Conference on Structural System Identification (2001, September)

A number of different identification methods are considered as candidate approaches to undertake online flight flutter testing. Rather than flying the test aircraft to a new flight condition and then ... [more ▼]

A number of different identification methods are considered as candidate approaches to undertake online flight flutter testing. Rather than flying the test aircraft to a new flight condition and then performing a data analysis at a constant flight condition, it is shown how it is feasible to track changes in frequencies and damping ratios as the flight speed is increased. It is also possible to provide an updated estimate of the predicted flutter speed, giving the flight engineers added confidence in the margin of safety. Both frequency and time domain methods are evaluated on a simulated 3 DOF aeroelastic system. These preliminary results show that such an approach is feasible although further work is required to determine the best testing and analysis approach. [less ▲]

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See detailExperimental Validation of the Constant Level method for Identification of Nonlinear Multi Degree of Freedom Systems
Dimitriadis, Grigorios ULg

in Starr, A. G.; Rao, R. B. K. N. (Eds.) Proceedings of the 14th International Congress on Condition Monitoring and Diagnostic Engineering Management (2001, September)

System identification methods for nonlinear dynamical systems could find uses in many applications such as condition monitoring, finite element model validation and stability determination. The ... [more ▼]

System identification methods for nonlinear dynamical systems could find uses in many applications such as condition monitoring, finite element model validation and stability determination. The effectiveness of existing nonlinear system identification techniques is limited by various factors such as the complexity of the system under investigation and the type of nonlinearities present. In this work, the Constant Level Identification approach, which can identify multi degree-of-freedom systems featuring any type of nonlinear function, including discontinuous functions, is validated experimentally. The method is shown to yield accurate identifications of an experimental dynamical system featuring two types of stiffness nonlinearity. The full equations of motion are accurately extracted, even in the presence of a discontinuous nonlinearity. [less ▲]

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See detailIntegration of fuzzy linear optimization and scenario analysis in network flow problems: disaster response perspective
Barbarosoglu, Gulay; Arda, Yasemin ULg

in IEPM 01, International Conference in Industrial Engineering and Production Management, Québec, Canada, 20-23 August 2001 (2001, August 20)

In this paper, we address the problem of transporting vital commodities and emergency personnel during the response stage of a disaster relief operation by integrating fuzzy linear optimization and the ... [more ▼]

In this paper, we address the problem of transporting vital commodities and emergency personnel during the response stage of a disaster relief operation by integrating fuzzy linear optimization and the principles of scenario analysis. We treat this transportation system as a probabilistic multi-commodity multi-modal network flow problem and first develop a fuzzy model that allows the satisfaction of demand requirements through different supply nodes over a fuzzy network. Since the available information in case of disasters is generally vague and imprecise about the values of model parameters, fuzzy linear optimization is employed to deal with this uncertainty and to generate different scenarios depending upon the preferences of the decision maker. Then these scenarios are handled within the framework of the scenario analysis by defining a scenario as a joint realization of the uncertain parameters. Here, scenario analysis method can be considered as a search for a robust solution that guarantees the maximum satisfaction of demands with the minimum transportation cost. [less ▲]

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