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See detailLa lutte contre la misère et l'exclusion. Pour une méthodologie du croisement des savoirs
Havelange, Carl ULiege

Scientific conference (2003, November 27)

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See detailCWATUP : le certificat de conformité
Delnoy, Michel ULiege

in Immobilier (2003), 21

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See detailCanister free videogrammetry system for thermal vacuum and space applications
Roose, Stéphane ULiege; Stockman, Yvan ULiege; Bolsee, Jean-Christophe et al

in Decker, J.; Brown, N. (Eds.) Proceedings of the Conference on Recent Developments in Traceable Dimensional Measurements, (2003, November 20)

The development of a canister-free videogrammetry system is presented. Applications in view, are coordinate measurements during thermal vacuum test and on-baord space flight metrology of mechanical ... [more ▼]

The development of a canister-free videogrammetry system is presented. Applications in view, are coordinate measurements during thermal vacuum test and on-baord space flight metrology of mechanical structures, reflectors and antenna's. The paper presents the breadboard system architecture. Two breadboards have been developed. One is based on a space-qualified micro-imager camera. Lenses and flashers are all commercial components and have been made vacuum compatible. Results of accuracy (typically 50ppm) and resolution (typically 25 ppm) tests, in ambient and in vacuum are also presented. [less ▲]

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See detailEstimation of surface soil organic matter by means of hyperspectral data analysis.
Touré, Souleymane; Tychon, Bernard ULiege

Conference (2003, November 19)

Data acquired from field campaign and hyperspectral airborne sensors were processed to determine the surface soil organic matter of an agricultural area located in Southern Belgium. The method adopted was ... [more ▼]

Data acquired from field campaign and hyperspectral airborne sensors were processed to determine the surface soil organic matter of an agricultural area located in Southern Belgium. The method adopted was based on a forward stepwise multiple regression analysis linking soil organic matter and hyperspectral data from two airborne sensors working in the visible and infrared domain. The results were validated successfully from an independent set of sampling points. It is concluded that the hyperspectral remote sensing approach is promising for soil organic matter prediction. Furthermore, this approach could even be improved if disturbance factors are removed. [less ▲]

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See detailTraffic Effects of Driver Assistance Systems – The Approach within INVENT
Benz, T.; Christen, Fréderic ULiege; Lerner, G. et al

(2003, November 16)

Within the German Research Initiative INVENT, the partial project „Verkehrliche Wirkung, Recht und Akzeptanz (VRA)“ deals with traffic effects, legal aspects, acceptance and economics of driver assistance ... [more ▼]

Within the German Research Initiative INVENT, the partial project „Verkehrliche Wirkung, Recht und Akzeptanz (VRA)“ deals with traffic effects, legal aspects, acceptance and economics of driver assistance systems. This presentation gives examples for the consulting services of VRA as well as for the early simulations of a driver assistance system. Such simulations vary in scale from basic functions over driving situations and traffic situations to traffic scenarios. Results are presented for the basic functions and driving situations for a stop-and-go extension of adaptive cruise control. [less ▲]

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See detailInfluence de la methyl-b-cyclodextrine sur la cinetique de libération de l'inuline encapsulée dans des liposomes bioadhésifs
Piel, Géraldine ULiege; Boulmedarat, Laila; Bochot, Amélie et al

Poster (2003, November 12)

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See detailCharacterization of the primary sonic muscles in Carapus acus (Carapidae): a multidisciplinary approach
Parmentier, Eric ULiege; Gennotte, Vincent ULiege; Focant, Bruno et al

in Proceedings of the Royal Society B : Biological Sciences (2003), 270(1530), 2301-2308

Sound production in carapid fishes results from the action of extrinsic muscles that insert into the swim bladder. Biochemical, histochemical and morphological techniques were used to examine the sonic ... [more ▼]

Sound production in carapid fishes results from the action of extrinsic muscles that insert into the swim bladder. Biochemical, histochemical and morphological techniques were used to examine the sonic muscles and compare them with epaxial muscles in Carapus acus. Sonic fibres are thicker than red and thinner than white epaxial fibres, and sonic fibres and myofibrils exhibit an unusual helicoidal organization: the myofibrils of the centre are in a straight line whereas they are more and more twisted towards the periphery. Sonic muscles have both features of red (numerous mitochondria, high glycogen content) and white (alkali-stable ATPase) fibres. They differ also in the isoforms of the light chain (LC3) and heavy chain (HC), in having T tubules at both the Z-line and the A–I junction and in a unique parvalbumin isoform (PAI) that may aid relaxation. All these features lead to the expression of two assumptions about sound generation: the sonic muscle should be able to perform fast and powerful contractions that provoke the forward movement of the forepart of the swim bladder and the stretching and ‘flapping’ of the swim bladder fenestra; the helicoidal organization allows progressive drawing of the swim bladder fenestra which emits a sound when rapidly released in a spring-like manner. [less ▲]

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See detailCampagne de mesure des odeurs sur le CET réhabilité de Belderbusch (Montzen) Enquête sur les nuisances olfactives
Nicolas, Jacques ULiege; Craffe, Flavien

Report (2003)

The study is made in the frame of a follow-up monitoring of all landfill sites in Wallonia, initiated by the Ministry of Environment and managed by ISSeP. The present report concerns the restored site of ... [more ▼]

The study is made in the frame of a follow-up monitoring of all landfill sites in Wallonia, initiated by the Ministry of Environment and managed by ISSeP. The present report concerns the restored site of Belderbusch. However, as first field inspections revealed no odour, the usual measurement methodology was not applied and a short survey in the neighbourhood population was conducted. [less ▲]

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See detailGeneva photometry of HD 129929 (Aerts+, 2004)
Aerts, C.; Waelkens, C.; Daszynska-Daszkiewicz, J. et al

in SIMBAD (2003), 341

We have gathered and analysed a timeseries of 1493 high-quality multicolour Geneva photometric data of the B3V {beta} Cep star Hd 129929. The dataset has a time base of 21.2 years. The occurrence of a ... [more ▼]

We have gathered and analysed a timeseries of 1493 high-quality multicolour Geneva photometric data of the B3V {beta} Cep star Hd 129929. The dataset has a time base of 21.2 years. The occurrence of a beating phenomenon is evident from the data. We find evidence for the presence of at least six frequencies, among which we see components of two frequency multiplets with an average spacing of ~0.0121c/d which points towards very slow rotation. This result is in agreement with new spectroscopic data of the star and also with previously taken UV spectra. We provide the amplitudes of the six frequencies in all seven photometric filters. The metal content of the star is Z=0.018+/-0.004. All these observational results will be used to perform detailed seismic modelling of this massive star in a subsequent paper. (1 data file). [less ▲]

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See detailOptical and mechanical design of a straylight rejection baffle for CoRoT
Plesseria, Jean-Yves ULiege; Mazy, Emmanuel ULiege; Defise, Jean-Marc ULiege et al

in Society of Photo-Optical Instrumentation Engineers (SPIE) Conference Series (2003, November 01)

The COROT mission is part of the program "Petites Missions" of CNES (French space agency). It implies international cooperation between France, Belgium, Germany, Austria, Spain and the European Space ... [more ▼]

The COROT mission is part of the program "Petites Missions" of CNES (French space agency). It implies international cooperation between France, Belgium, Germany, Austria, Spain and the European Space Agency (ESA). COROT aims to perform astroseismology measurements and to detect exoplanets. Long duration observations of stars will be used to detect periodic variations with an afocal telescope followed by a dioptric objective and 4 CCDs. Due to the orbit of the spacecraft (low altitude polar orbit) and even if the observation are performed in a direction perpendicular to orbit plane, the measurements can be disturbed by the straylight reflected on the earth (albedo) that can generate periodic perturbation. CSL is in charge of the design and procurement, with the help of Belgian industries, of a baffle and its protective cover that will be mounted on top of the afocal entrance telescope. The requirements are very stringent from the optical point of view as well as from the mechanical point of view. The rejection of the baffle must be of the order of 10[SUP]13[/SUP] for field angles above 20 degrees while the allocated mass is 19 kilograms. [less ▲]

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See detailSimulated annealing for complex portfolio selection problems
Crama, Yves ULiege; Schyns, Michael ULiege

in European Journal of Operational Research (2003), 150(3), 546-571

This paper describes the application of a simulated annealing approach to the solution of a complex portfolio selection model. The model is a mixed integer quadratic programming problem which arises when ... [more ▼]

This paper describes the application of a simulated annealing approach to the solution of a complex portfolio selection model. The model is a mixed integer quadratic programming problem which arises when Markowitz' classical mean-variance model is enriched with additional realistic constraints. Exact optimization algorithms run into difficulties in this framework and this motivates the investigation of heuristic techniques. Computational experiments indicate that the approach is promising for this class of problems. (C) 2003 Elsevier B.V. All rights reserved. [less ▲]

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See detailFEM study of metal sheets with a texture based, local description of the yield locus
Duchene, Laurent ULiege

Doctoral thesis (2003)

Résumé de l’ouvrage La thèse déposée par L. Duchêne comporte cinq chapitres dont une introduction et des conclusions et perspectives et totalise 183 pages. La bibliographie compte 94 références. L’ouvrage ... [more ▼]

Résumé de l’ouvrage La thèse déposée par L. Duchêne comporte cinq chapitres dont une introduction et des conclusions et perspectives et totalise 183 pages. La bibliographie compte 94 références. L’ouvrage a pour objet la modélisation du comportement mécanique des tôles métalliques (principalement des tôles d’acier obtenues par laminage) lors des processus de mise à forme. L’anisotropie de la tôle découle de la mesure de la texture du matériau. Les processus de mise à forme étudiés sont principalement l’emboutissage des tôles. Le mémoire propose le développement de deux méthodes locales d’interpolation de la surface de plasticité. Ensuite, ces modèles sont implémentés dans le code éléments finis LAGAMINE, puis validés sur quelques exemples académiques et finalement des applications industrielles sont examinées. Analyse du contenu Le premier chapitre introduit le sujet, définit le cadre dans lequel l’auteur situe sa démarche et présente les originalités du travail. Le deuxième chapitre est consacré à la description du comportement microscopique des métaux et des méthodes de transition micro-macro. Le comportement d’un monocristal ou plutôt le comportement d’un cristal à l’intérieur d’un polycristal est examiné. Les modèles microscopiques de Taylor et de Bishop-Hill constituant une approche primal-dual pour ce problème sont décrits. Le comportement macroscopique du polycristal est obtenu à partir du comportement microscopique via la transition micro-macro sur base de la texture du matériau. Cette texture est généralement caractérisée par son ODF (Orientation Distribution Function). Cependant, le modèle de transition micro-macro utilisé, basé sur les hypothèses de Taylor, nécessite une description de la texture par un ensemble d’orientations cristallines représentatif de la texture du matériau. Différentes méthodes d’extraction de l’ensemble de cristaux représentatif sont décrites. Le nombre de cristaux inclus dans l’ensemble représentatif est un paramètre important et est discuté. Le comportement élastique et plastique du polycristal sont décrits. Outre le modèle de transition micro-macro basé sur les hypothèses de Taylor, d’autres modèles plus récents et plus coûteux en temps de calcul sont décrits. Le deuxième chapitre introduit également l’écrouissage du polycristal. Le troisième chapitre présente les étapes successives du développement de l’approche locale de la surface de plasticité. Etant donné que la surface de plasticité est définie dans l’espace à 5 dimensions des contraintes déviatoriques, des notions de géométrie dans un espace à n dimensions sont présentées. Différentes propriétés des domaines dans lesquels la surface de plasticité est localement définie sont décrites ; ainsi que la méthode de construction des domaines et le lien entre domaines voisins. Deux méthodes d’interpolation à partir de points calculés via le modèle de Taylor de la surface de plasticité à l’intérieur des domaines ont été développées et sont présentées. La méthode de hyperplans définit localement la surface de plasticité au moyen d’hyperplans (des plans dans l’espace à 5 dimensions des contraintes déviatoriques). La méthode d’interpolation directe contraintes-déformations permet une représentation plus précise et plus continue entre domaines voisins de la surface de plasticité. Etant donné son importance cruciale pour la convergence des simulations numériques utilisant la méthode des éléments finis, la normale à la surface de plasticité est soigneusement examinée pour les deux méthodes locales d’interpolation. Certains problèmes particuliers rencontrés lors du développement et liés à l’approche locale de la surface de plasticité sont présentés pour les deux méthodes d’interpolation. Quelques points particuliers liés à l’implémentation de ces méthodes dans le code éléments finis LAGAMINE sont décrits. Le principal intérêt de l’approche locale de la surface de plasticité est son efficacité lors du calcul de l’évolution de texture au cours des déformations plastiques. Un paragraphe est dès lors consacré aux détails de calcul des rotations des orientations cristallines et à l’implémentation de l’évolution de texture dans le code éléments finis. Le chapitre 3 se termine par un paragraphe qui analyse la précision, la robustesse et le gain en temps de calcul (par rapport à l’utilisation directe du modèle de Taylor) de l’approche locale de la surface de plasticité. Le quatrième chapitre présente les validations de l’approche locale de la surface de plasticité. Trois validations académiques sont tout d’abord effectuées : prédiction de l’évolution de texture lors du laminage ; prédiction de l’effet Swift en cours de torsion d’un tube ou d’un cylindre et comparaison du comportement en torsion et compression des métaux cubiques faces centrées et cubiques centrés isotropes. La première validation complexe est l’emboutissage de godets circulaires à fond plat. Les résultats des simulations (distribution des déformations plastiques, évolution de la force poinçon en fonction du temps, prédiction des oreilles d’emboutissage et prédiction de la texture finale) sont comparés aux valeurs expérimentales. La géométrie du processus d’emboutissage, la mesure des valeurs expérimentales et les paramètres numériques utilisés pour les simulations sont largement détaillés. L’influence de certains paramètres numériques sur les résultats des simulations est de plus analysée. Une seconde simulation d’emboutissage avec une autre géométrie et un matériau plus anisotrope est également étudiée. Les oreilles d’emboutissage sont particulièrement analysées ; le retour élastique dû à un retrait des outils est examiné. Le mémoire se termine par un cinquième chapitre qui présente des perspectives et des conclusions permettant à l’auteur de synthétiser les apports de sa thèse et d’indiquer quelles directions de recherches lui paraissent devoir être explorées dans le futur. [less ▲]

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See detailCompléments de C++
Boman, Romain ULiege

Scientific conference (2003, November)

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See detailAcquired aqueductal stenosis in preterm infants: an indication for neuroendoscopic third ventriculostomy
Scavarda, D; Bednarek, N; Litré, Claude Fabien ULiege et al

in Child's Nervous System (2003), 19(10-11), 756-9

Abstract Object: The object of this study is to demonstrate the delayed occurrence of aqueductal stenosis in preterm infants who have suffered from intraventricular hemorrhage (IVH) and to try to explain ... [more ▼]

Abstract Object: The object of this study is to demonstrate the delayed occurrence of aqueductal stenosis in preterm infants who have suffered from intraventricular hemorrhage (IVH) and to try to explain the mechanisms of this stenosis. Method: From January 1996 to June 2002, 1,046 premature infants were admitted to our institution. Thirty-six neonates suffered from grade 3 or 4 intraventricular hemorrhage (Papile grading), of whom 16 died. Twenty patients survived and a ventriculoperitoneal shunt was inserted in 7 infants. Four patients underwent a neuroendoscopic third ventriculostomy. Follow-up was carried out, twice a month during the first 2 months and subsequently twice a year. Conclusion: In 2 children NTV was an effective treatment for hydrocephalus with an average follow-up of 29 months. The specific pattern concerning these patients is the long delay before obstructive hydrocephalus and the visualization of de novo obstruction with MRI. The biological explanation must be investigated. Keywords Premature newborn · Intraventricular hemorrhage · Hydrocephalus · Neuroendoscopy · Aqueductal stenosis · Acquired obstructive hydrocephalus · Transforming growth factor b1 [less ▲]

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See detailUn bilan du programme quinquennal 1998-2002
Lonfils, R.; Lebailly, D.; De Bock, C. et al

in Education Santé (2003), (184), 10-16

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See detailNotions d'acoustique
Embrechts, Jean-Jacques ULiege

Conference (2003, November)

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See detailRole of estrogens in the modulation of inflammatory pain : a study in aromatase knock-out mice using the trigeminal formalin model
Multon, Sylvie ULiege; RIKIR, Estelle ULiege; HALLEUX, Sandrine ULiege et al

in Book of Abstracts of the 33th Annual Meeting Society for Neuroscience (Nov 2003) (2003, November)

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See detailIdentification et tautologie: L'identité chez Husserl et Wittgenstein
Seron, Denis ULiege

in Revue Philosophique de Louvain (2003), 101(4), 593-609

A question common to the sixth Logical Research of Husserl and to Wittgenstein's Tractatus is the question of the status of mathematical equations, and more broadly of judgements of identity. It is that ... [more ▼]

A question common to the sixth Logical Research of Husserl and to Wittgenstein's Tractatus is the question of the status of mathematical equations, and more broadly of judgements of identity. It is that of whether the mathematician expresses propositions, which as such bear a character of possible truth, or, on the contrary, simple rules of substitution useful for calculations. As formulated by Frege, this question can be summarized as follows: does mathematical knowledge exist? In reply to this question Husserl's position may be interpreted as being midway between Kant and Wittgenstein. [less ▲]

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See detailActivation of circulating polymorphonuclear neutrophils during exercise-induced muscle damage
Camus, Gérard; Croisier, Jean-Louis ULiege; Chapelle, Jean-Paul ULiege et al

in Pflugers Arch – Eur J Physiol (2003, November), 447

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