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See detailEvolution de la viabilité cellulaire dans les procédés de production de ferments lactiques : effet du type de bactérie sur l'évaluation par cytométrie en flux
Delvigne, Frank ULg; Thiry, Christophe ULg; Pierart, Céline ULg et al

Conference (2011, November 29)

La cytométrie en flux est une technique permettant d'effectuer des analyses au niveau des cellules individuelles. Cette technique a été développée à l'origine pour l'analyse de cellules animales dans des ... [more ▼]

La cytométrie en flux est une technique permettant d'effectuer des analyses au niveau des cellules individuelles. Cette technique a été développée à l'origine pour l'analyse de cellules animales dans des applications à finalité médicale. Ce n'est que dans les années 90 que cette technique a été considérée dans le cadre des cellules microbiennes procaryotes et eucaryotes. Grâce à l'évolution des technologies (laser à l'état solide, progrès dans la maîtrise des micro-écoulements,…), plusieurs développeurs proposent actuellement des cytomètres en flux pour des budgets abordables (environ 30.000 euros). Cette évolution entraîne actuellement un engouement des industriels pour la mise en oeuvre de cette technique pour le suivi de l'évolution des populations microbiennes dans divers procédés : brasserie, vinaigrerie, production de starters pour la boulangerie, production de starters lactiques,… L'intérêt manifesté pour cette technique est simple à comprendre si on considère les techniques actuelles pour l'estimation de la viabilité cellulaire. En effet, celles-ci reposent souvent sur la revification des cellules sur milieu gélosé et comptage des colonies après un temps d'incubation. Le problème fondamental de cette technique repose sur l'utilisation de conditions de culture qui ne sont pas forcément identiques à celle rencontrée au niveau du processus de production. Ce phénomène entraîne une sous-estimation des cellules microbiennes actives rassemblées sous le terme de "viables mais non cultivables". A cela s'ajoutent des problèmes techniques imposés par le temps de remise en culture et l'obtention des résultats bien après que le processus de production soit terminé, ainsi que par des procédures de laboratoire coûteuses en personnel et en consommables. La cytométrie s'impose donc comme une technique de choix qui permet d'analyser les cellules microbiennes individuelles sans étape de remise en culture et avec un débit expérimental élevé. En effet, 30.000 cellules peuvent être analysées en 30 secondes immédiatement après la prise d'échantillon, ce qui permet éventuellement de corriger les conditions de procédés en fonction de l'état des micro-organismes. L'utilisation de fluorochromes spécifiques permet l'analyse de caractéristiques cellulaires. Dans le cas des bactéries lactiques, l'utilisation du couple de colorant "carboxyfluorescéine diacétate" / "iodure de propidium" (cFDA/PI) est mis en oeuvre en routine pour la détermination de la viabilité cellulaire. L'iodure de propidium pénètre dans les cellules ayant une membrane endommagée et les colore en rouge, tandis que le cFDA est un composé non fluorescent qui diffuse au travers de toutes les membranes cellulaires et est hydrolysées par les activités estérases intracellulaires pour donner un composé fluorescent vert. Ces deux composantes de fluorescence peuvent être facilement caractérisées par analyse multi paramétrique au niveau d'un cytomètre en flux. La difficulté majeure que rencontre l'application de la cytométrie en flux au niveau industriel réside dans l'interprétation des résultats. Dans ce travail, trois souches de bactéries lactiques ayant des sensibilités différentes au stress de procédé ont été mise en oeuvre dans des schémas de production industriels faisant intervenir les étapes suivantes : production en bioréacteur agité de 2m³, récolte par centrifugation continue, congélation et lyophilisation. L'analyse par cytométrie en flux montre des tendances fondamentalement différentes pour les trois types de micro-organismes. Les deux souches microbiennes plus sensibles au stress de procédé du fait de leur caractère anaérobie strict ou microaérophile montrent des sous-populations bien distinctes au niveau des cytogrammes, tandis que la souche plus résistante ne montre qu'une seule population évoluant suivant les étapes du procédé. Ces observations sont utilisées pour une meilleure interprétation des cytogrammes pour l'estimation de la viabilité cellulaire en conditions de procédé. Une meilleure interprétation peut également être obtenue en considérant la possibilité de relargage des produits de dégradation fluorescents provenant de l'hydrolyse du cFDA en fonction de l'état de la membrane cellulaire. [less ▲]

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See detailLa justice réparatrice en milieu carcéral: de l'utopie au travail sur soi
Dubois, Christophe ULg

Conference (2011, November 28)

Detailed reference viewed: 56 (12 ULg)
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See detailChildren’s rights in the Global South (introduction)
Andre, Géraldine ULg

Conference (2011, November 25)

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See detailLes relations région-ville: diversité et confusion ? Réflexions au départ du cas belge
Husson, Jean-François ULg

Conference (2011, November 25)

Cette communication présente la problématique de la structure de l'Etat en Belgique sous l'angle des finances publiques et se concentre sur les institutions infra-régionales.

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See detailTendances dans les procédures de coopération et de gestion des conflits
Bouhon, Frédéric ULg

Conference (2011, November 25)

L'objet de la communication consiste à présenter les principales évolutions en matière de coopération entre les entités fédérales et l'Autorité fédérale suite à l'accord politique sur la sixième réforme ... [more ▼]

L'objet de la communication consiste à présenter les principales évolutions en matière de coopération entre les entités fédérales et l'Autorité fédérale suite à l'accord politique sur la sixième réforme de l'État. [less ▲]

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See detailDe Genève à Ouagadougou ou comment une loi internationale protège-t-elle des enfants burkinabè : l’exemple de la convention 182 de l’OIT
Wouango, Joséphine ULg

Conference (2011, November 25)

Cette communication analyse une politique publique dans un pays qui n’a pas de moyens, qui dépend des ressources extérieures non seulement en argent mais aussi au niveau normatif pour ses politiques ... [more ▼]

Cette communication analyse une politique publique dans un pays qui n’a pas de moyens, qui dépend des ressources extérieures non seulement en argent mais aussi au niveau normatif pour ses politiques sociales. On pense alors que les problématiques des droits de l’enfant et de la protection de l’enfance sont des problématiques qui viennent un peu en surplomb et qui semblent imposées. Le sont-elles vraiment ? Quelles sont les logiques autour de la traduction nationale de ces textes internationaux de protection de l’enfance ? Les acteurs nationaux sont-ils « poussés » dans le dos pour mettre ces questions à l’agenda politique ? L’examen des péripéties de la ratification de la convention 182 de l’OIT par le Burkina Faso et de sa transcription en politique publique nationale nous permettra de questionner de l’intérieur les enjeux et les logiques en présence. [less ▲]

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See detailDesign participatif d'un système de vote électronique
Parotte, Céline ULg; Rossignol, Nicolas ULg

Conference (2011, November 25)

Cette communication présente l'évolution des registres discursifs rencontrés tout au long du processus de design participatif. Ils montrent que le caractère itératif du processus permet la résolution ... [more ▼]

Cette communication présente l'évolution des registres discursifs rencontrés tout au long du processus de design participatif. Ils montrent que le caractère itératif du processus permet la résolution progressive de problèmes identifiés par les acteurs, tout en notant la persistence de blocages concernant certaines implications de la mise en oeuvre d'un système de vote électronique, précisément sur ce que "fait faire" aux acteurs ce nouveau système. [less ▲]

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See detailGetting the facts straight ?
Leclercq, Bruno ULg

Conference (2011, November 25)

Detailed reference viewed: 8 (1 ULg)
See detailEffectiveness of the review of individual applications before the European court of Human Rights
Behrendt, Christian ULg

Conference (2011, November 24)

Paper presented at the Round Table Meeting held at the Constitutional Court of Turkey and organized by the Council of Europe, as part of the "Joint Project of the European Union and the Council of Europe ... [more ▼]

Paper presented at the Round Table Meeting held at the Constitutional Court of Turkey and organized by the Council of Europe, as part of the "Joint Project of the European Union and the Council of Europe on Enhancing the Role of the Supreme Judicial Authorities of Turkey in respect of European standards". [less ▲]

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See detailVitamine D et maladies infectieuses
CAVALIER, Etienne ULg; MOUTSCHEN, Michel ULg; Brunel, Elodie ULg

Conference (2011, November 24)

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See detailNorovirus outbreaks in hospitals: epidemiology, diagnosis, management and control.
HUYNEN, Pascale ULg

Conference (2011, November 24)

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See detailMicrophone arrays fundamentals
Embrechts, Jean-Jacques ULg

Conference (2011, November 23)

Microphone arrays are essentially directional sensors. They are therefore mainly used for locating, identifying, isolating, measuring and recording individual sound sources. The main principles governing ... [more ▼]

Microphone arrays are essentially directional sensors. They are therefore mainly used for locating, identifying, isolating, measuring and recording individual sound sources. The main principles governing the directivity of microphone arrays are reviewed: phase differences between signals create constructive and destructive interferences, depending on the direction of the sound source. Moreover, signal processing is applied to provide “beamforming”, i.e. beam shaping and steering. Contrary to continuous antenna, discrete arrays can create aliasing, which can result in false detections of sound sources. The delay-and-sum and filter-and-sum beamformers are described. Finally, as simple beamformers are often frequency dependent, some solutions to obtain constant (broad-band) directivity are presented. [less ▲]

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See detailLa famine Ruzagayura, une des manifestations de la Deuxième Guerre mondiale au Rwanda (1943-1944)
Singiza, Dantès ULg

Conference (2011, November 23)

Dans cette communication, Dantès Singiza parle de l’un des événements qui marquent la période de la Deuxième Guerre mondiale au Rwanda, à savoir la famine Ruzagayura de 1943-1944. Il explique son ampleur ... [more ▼]

Dans cette communication, Dantès Singiza parle de l’un des événements qui marquent la période de la Deuxième Guerre mondiale au Rwanda, à savoir la famine Ruzagayura de 1943-1944. Il explique son ampleur, ses conséquences, les réactions de différents acteurs ainsi que les causes de cette catastrophe. Il établit notamment un lien entre cette famine et la Deuxième Guerre mondiale. [less ▲]

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See detailPhysics of badminton shuttlecock. Part 2 : Turn around
Darbois-Texier, Baptiste ULg; Cohen, Caroline; Quéré, David et al

Conference (2011, November 22)

We study experimentally shuttlecocks dynamics. In this part we show how the shuttlecock shape is optimized for badminton play. The shuttlecock always flies the nose forehead. After the impact it has thus ... [more ▼]

We study experimentally shuttlecocks dynamics. In this part we show how the shuttlecock shape is optimized for badminton play. The shuttlecock always flies the nose forehead. After the impact it has thus to return. Actually it returns, oscillates and then stabilizes. We try to understand these damping oscillations and draw an analogy with the dandelions achenes and parachutists. [less ▲]

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See detailLe désir d’enfant chez les couples lesbiens
Naziri, Despina ULg

Conference (2011, November 22)

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See detailPhysics of badminton shuttlecocks. Part 1 : aerodynamics
Cohen, Caroline; Darbois-Texier, Baptiste ULg; Quéré, David et al

Conference (2011, November 22)

We study experimentally shuttlecocks dynamics. In this part we show that shuttlecock trajectory is highly different from classical parabola. When one takes into account the aerodynamic drag, the flight of ... [more ▼]

We study experimentally shuttlecocks dynamics. In this part we show that shuttlecock trajectory is highly different from classical parabola. When one takes into account the aerodynamic drag, the flight of the shuttlecock quickly curves downwards and almost reaches a vertical asymptote. We solve the equation of motion with gravity and drag at high Reynolds number and find an analytical expression of the reach. At high velocity, this reach does not depend on velocity anymore. Even if you develop your muscles you will not manage to launch the shuttlecock very far because of the ``aerodynamic wall.'' As a consequence you can predict the length of the field. We then discuss the extend of the aerodynamic wall to other projectiles like sports balls and its importance. [less ▲]

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See detailEconomie et systèmes productifs : contextualisation des besoins et des enjeux
Halleux, Jean-Marie ULg

Conference (2011, November 22)

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See detailIntermédiaire du marché du travail : un métier en tensions
Orianne, Jean-François ULg

Conference (2011, November 21)

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See detailLa place de l’activité physique dans la société moderne
Cloes, Marc ULg

Conference (2011, November 21)

Les représentations de la population à l'égard de l'activité sont souvent erronées (lien exclusif au sport, temps, intensité exigée, coût, concentration le week-end). Dans la perspective d'amener les ... [more ▼]

Les représentations de la population à l'égard de l'activité sont souvent erronées (lien exclusif au sport, temps, intensité exigée, coût, concentration le week-end). Dans la perspective d'amener les citoyens à adopter un style de vie plus actif, il importe de diffuser des informations adéquates. Grâce à une série d'activités interactives, cette conférence permet aux participants de prendre conscience des recommandations actuelles proposées par les organismes de la santé en matière d'activité physique. Des pistes d'actions sont proposées afin d'impliquer le public dans un processus d'intervention personnelle et collective [less ▲]

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See detailDe klinkers in het Nederlands van Franstalige leerders
Williquet, Emilie; Hiligsmann, Philippe; Rasier, Laurent ULg

Conference (2011, November 19)

Detailed reference viewed: 46 (5 ULg)
See detailIntertekstualiteit in de gedichten van Hans Faverey
Dieu, Véronique ULg

Conference (2011, November 19)

Intertekstualiteit in de gedichten van de Nederlandse dichter Hans Faverey (1933-1990) kan niet los worden gezien van de thema’s en motieven die in zijn hele œuvre voorkomen: de spanning tussen beweging ... [more ▼]

Intertekstualiteit in de gedichten van de Nederlandse dichter Hans Faverey (1933-1990) kan niet los worden gezien van de thema’s en motieven die in zijn hele œuvre voorkomen: de spanning tussen beweging en stilstand, tussen het organische en het minerale en tussen leven en dood. Intertekstuele verwijzingen nemen in zijn gedichten diverse vormen aan (citaat, allusie, vertaling, motto, opdracht,…) en ze dragen ertoe bij de algemene thematiek van de gedichten te belichten. In de acht bundels die hij publiceerde, verwijst Faverey vaak naar figuren uit de Griekse mythologie of naar Griekse filosofen (vooral de pre-Socratici). Toch beperkte hij zich niet tot de klassieke Oudheid: hij inspireerde zich ook op moderne Nederlandse of buitenlandse auteurs. Ook durfde hij de grenzen van de literaire westerse cultuur te overschrijden door de orale traditie in het verre Suriname te vermelden. Daarnaast zijn andere (niet-literaire) kunstvormen ook een belangrijke inspiratiebron voor Faverey. Herhaaldelijk gebruikte hij het werk van schilders of componisten als uitgangspunt bij het schrijven van zijn gedichten. Aan de hand van een paar gedichten wil ik laten zien hoe vorm en inhoud in de gedichten van Hans Faverey in elkaar samenvloeien, met intertekstualiteit als één mogelijk snijpunt. [less ▲]

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See detailEQUINE SEMEN FREEZING: STATE OF THE ART AND PERSPECTIVES.
Ponthier, Jérôme ULg

Conference (2011, November 19)

Depuis vingt ans, la congélation du sperme a permis de diffuser la génétique des étalons. Les congélations effectuées en dehors des saisons sportives permettent d’inséminer de nombreuses juments pendant ... [more ▼]

Depuis vingt ans, la congélation du sperme a permis de diffuser la génétique des étalons. Les congélations effectuées en dehors des saisons sportives permettent d’inséminer de nombreuses juments pendant que les étalons concourent dans des lieux éloignés. Les éleveurs ont en permanence accès à des doses d’insémination sans risques sanitaires. Cependant, malgré une bonne qualité de sperme frais, 20% des éjaculats équins ne supportent pas la congélation (Vidament, 2005). Le but de cette présentation est de revoir la physiologie du spermatozoïde et d’en discuter les implications dans le contexte de la congélation. Les améliorations des techniques de congélation présentes ou à venir seront aussi évoquées. [less ▲]

Detailed reference viewed: 60 (10 ULg)
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See detailSocial, Ethnic and Gender Dimensions and Stakes in Civic and Politic Participation
Gavray, Claire ULg; Born, Michel ULg; Fournier, Bernard

Conference (2011, November 18)

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See detailWhat's In a Name? Language Labeling and Categorization in Acadie
Urbain, Emilie ULg; Boudreau, Annette

Conference (2011, November 18)

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See detailLa mémoire à court terme : un défi à long terme.
Majerus, Steve ULg

Conference (2011, November 18)

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See detailLes municipalités dans les banlieues de Beyrouth : un acteur clé dans la fabrique urbaine d’une ville fragmentée
Farah, Jihad ULg

Conference (2011, November 17)

La fin de la guerre civile (1975-1990) au Liban ramène à Beyrouth un grand projet de reconstruction et de métropolisation piloté par l’Etat central. Ce projet, fait d’infrastructures routières, de projets ... [more ▼]

La fin de la guerre civile (1975-1990) au Liban ramène à Beyrouth un grand projet de reconstruction et de métropolisation piloté par l’Etat central. Ce projet, fait d’infrastructures routières, de projets urbains et centré sur le projet de reconstruction du centre-ville, vise à désenclaver les territoires en guerre et mettre la ville sur la carte de la globalisation. Il doit toutefois faire face à des constructions territoriales communautaires menées par des grands acteurs politiques dans de larges secteurs de la ville. Ceci mène à de nombreux blocages politiques. Ainsi, le retour des municipalités en 1998, après 35 ans depuis les dernières élections, est perçu comme une façon d’aller au delà des blocages en ouvrant un espace d’action aux acteurs locaux et en transférant certains enjeux secondaires au local. La (re)construction des territoires municipaux – une échelle qui perd sa pertinence pendant la guerre – doit se faire en s’articulant au projet de métropolisation de l’Etat et aux territorialisations communautaires des grands acteurs politiques. En même temps, elle doit articuler, en les intéressant et les « enrôlant », les projets des acteurs associatifs, économiques et religieux ancrés dans les quartiers des communes. De 1998 à 2010, les municipalités, notamment dans les banlieues de Beyrouth, sont parmi les acteurs qui contribuent le plus à la « fabrique urbaine » de cette ville, en engageant de grands projets d’équipements, d’infrastructures, d’espaces publics, des services… En fait, les acteurs municipaux réussissent à mettre en places des réseaux d’acteurs qui leur permettent de rassembler les ressources nécessaires pour aller au-delà de leurs faibles moyens et mince marge politique. Dans cette communication nous discutons les potentialités, originalités et limitations de ces constructions territoriales municipales à travers l’exemple de trois municipalités dans les banlieues de Beyrouth qui représentent trois situations types. L’hypothèse est que les spécificités de ces réseaux d’acteurs ont des conséquences importantes sur la construction des territoires municipaux en termes d’outils d’actions ainsi que d’impact sur les interdépendances entre les entités sociospatiales dans chaque commune et entre les communes au niveau de la ville. [less ▲]

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See detailEnergy efficiency of sludge drying processes
Léonard, Angélique ULg; Crine, Michel ULg; Arlabosse, Patricia

Conference (2011, November 17)

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See detailLa métagénomique au service de la microbiologie alimentaire : étude de l’évolution des populations microbiennes lors du vieillissement de deux matrices alimentaires
Taminiau, Bernard ULg; Nezer, Carine; Poullet, Jean-Baptiste et al

Conference (2011, November 17)

La viande et les préparations à base de viande représentent des biotopes de choix pour les bactéries. L’optimisation de la conservation de ces denrées, importante tant du point de vue économique que de ... [more ▼]

La viande et les préparations à base de viande représentent des biotopes de choix pour les bactéries. L’optimisation de la conservation de ces denrées, importante tant du point de vue économique que de santé publique passe par une meilleure connaissance de ces biotopes et des processus de détérioration de leurs qualités. Les microbiologistes ont depuis longtemps abordé ce problème en utilisant différentes approches. Ainsi, les études basées sur les méthodes de culture ont été complétées par des stratégies axées sur des approches indépendantes de la culture microbiologique. Les techniques actuelles de séquençage de nouvelle génération ont permis de donner une nouvelle dimension à l’écologie microbienne à travers l’analyse métagénomique d’un grand nombre d’individus au sein d’une population microbienne mixte. Notre propos est de démontrer que cette méthodologie peut être appliquée avec succès à l’étude des flores microbiennes des denrées alimentaires et pourra être adaptée, à court terme, aux exigences spécifiques de la microbiologie alimentaire. Dans cette étude, un produit de viande crue et une préparation de viande cuite, la viande hachée de porc et le boudin blanc, ont subi un test de vieillissement dans différentes conditions de conservation (Température et packaging). L’ADN ribosomal 16S a été extrait des produits originaux et des échantillons à la date limite de consommation et, après normalisation, les régions hypervariables V5 et V6 de l’ADN 16S ont été séquencées. Un total d’environ 130.000 séquences ont été obtenues et une analyse métagénomique a abouti à la classification taxonomique au genre pour 80% de cette population. L’analyse subséquente des populations microbiennes montre que les populations microbiennes majoritaires à la date limite de conservation sont bien celles qui sont généralement observées lors d’analyse microbiologiques de ces produits de viande. Toutefois, les populations sous-dominantes et surtout plusieurs populations de germes non cultivables ont pu être identifiée. Ces groupes de bactéries, plus difficile à obtenir par d’autres méthodes (culture-dépendante et indépendante confondues), doivent être étudiées car elles participent aux processus de détériorations de ces matrices alimentaires. Enfin, la sensibilité de cette technologie rend possible l’analyse des denrées alimentaires présentant un taux microbien très faible et permet donc l’identification des contaminants microbiens avant leur développement. [less ▲]

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See detailÉtude de cas : allégations de santé dans le domaine de la santé osseuse
Bruyère, Olivier ULg

Conference (2011, November 16)

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See detailThe extended finite element method for three-dimensional reinforced composites.
Duboeuf, Frédéric ULg; Béchet, Eric ULg

Conference (2011, November 16)

This paper deals with the use of eXtended Finite Element Method (XFEM) to perform local effects in three-dimensional reinforced composites. This method was first introduced to model cracks. It is based on ... [more ▼]

This paper deals with the use of eXtended Finite Element Method (XFEM) to perform local effects in three-dimensional reinforced composites. This method was first introduced to model cracks. It is based on the partition of unity concept and the description of discontinuities like the location of holes and material interfaces is often realized by the level-set method. The approach considered allows (i) to easily model the real geometry of reinforcing fibers (not idealized), (ii) to impose arbitrary Dirichlet and Neumann boundary conditions on the implicit defined boundaries and (iii) to introduce models of degradation. Numerical applications are presented on some academic tests. [less ▲]

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See detailFigures et lieux de l’alternative : un état des lieux
Dejasse, Erwin ULg

Conference (2011, November 16)

When critically exploring alternative comics, the various actors participating in the processes of legitimization of the form—including print and broadcast media, festivals, scholars and the critical ... [more ▼]

When critically exploring alternative comics, the various actors participating in the processes of legitimization of the form—including print and broadcast media, festivals, scholars and the critical community—often privilege a handful of people (Sfar, Trondheim, Ware, Satrapi…), a small number of publishers (especially L’Association), a few particular formats such as the “graphic novel,” emblematic genres (the memoir and autobiography), or certain geographical areas such as France and/or the United States. In fact, the phenomenon of alternative comics may take a multitude of forms and is resolutely international in scope. Despite this diversity, alternative comics worldwide nevertheless share common objectives. They notably include a challenging of two of the most common critical stances directed against a multitude of “traditional” publishers of the form, namely: their inclination towards ethnocentricity and their cultivation of amnesia. Far from sweeping away the history of the form, alternative comics artists and publishers alike attach great value to the past of the medium and generally embrace it. [less ▲]

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See detailEffets de la variation de pression sur la qualité des jets de pulvérisation et leur contribution aux risques de pollution environnementale.
Boukhalfa, Hassina dite Hafida ULg

Conference (2011, November 16)

Un traitement phytosanitaire s’effectue en visant un triple objectif: être efficace, ne pas mettre en danger l’opérateur et protéger l’environnement. (MOREAU et al., 1997). La quantité de pesticides ... [more ▼]

Un traitement phytosanitaire s’effectue en visant un triple objectif: être efficace, ne pas mettre en danger l’opérateur et protéger l’environnement. (MOREAU et al., 1997). La quantité de pesticides appliquée chaque année est estimée à 2.5 millions de tonnes mais la part de cette quantité qui entre en contact avec les organismes indésirables est très faible. La plupart des chercheurs l’évaluent à moins de 1% (ELAISSAOUI et al., 2004), ce qui veut dire que 99% des substances chimiques entre en contact avec le milieu environnant d’une manière non ciblé et sont potentiellement dangereux pour les écosystèmes entiers. D'après FAGOT et LARRAT (2002), la pression a un effet direct sur la répartition du produit et le volume de bouillie appliqué par son action sur la taille des gouttelettes et sur l'angle du jet de pulvérisation. Dans le but d’accroître l’efficacité de pulvérisation de pesticides et de réduire les pertes diverses de bouillie qui en résultent, nous avons étudie l’influence de la variation de pression sur la forme et la composition d’un jet de pulvérisation à l’aide d’un pulvérisateur à pression de liquide à jet projeté avec une buse à turbulence. Le travail a été effectue avec 5 valeurs de pression 0.5 bar, 1 bar, 1.5 bar, 2 bar et 2.5 bar. Les résultats obtenus nous ont permit d'en déduire que la pression de 1bar donne la meilleure couverture et répartition du jet de pulvérisation. A partir de la pression de 1.5 bar commence la dérive, et des pressions plus élevées rendent le jet irrégulier et hors cible. L'augmentation de pression augmente les pertes en bouillie et la quantité de fines gouttelettes. [less ▲]

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See detailVitamin D, 1-84 PTH and KDIGO Guidelines
CAVALIER, Etienne ULg

Conference (2011, November 16)

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See detailTopology optimization of electrostatic micro-actuators including electromechanical stability constraint
Lemaire, Etienne ULg; Van Miegroet, Laurent ULg; Rochus, Véronique et al

Conference (2011, November 16)

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See detailThe ecological study of an unknown non-timber forest product (NTFP): the African walnut (Coula edulis Baill.)
Moupela, Christian ULg; Vermeulen, Cédric ULg; Lebailly, Philippe ULg et al

Conference (2011, November 15)

Le noisetier d’Afrique, Coula edulis Bail., produit des graines de grande valeur nutritive régulièrement collectées et commercialisées par les populations locales. Toutefois, certains aspects fondamentaux ... [more ▼]

Le noisetier d’Afrique, Coula edulis Bail., produit des graines de grande valeur nutritive régulièrement collectées et commercialisées par les populations locales. Toutefois, certains aspects fondamentaux de son écologie, dont le potentiel de production, la dispersion et la prédation des fruits, demeurent inconnus, ce qui pourrait constituer un frein à sa valorisation. L’étude s’est déroulée au Gabon et s’est attachée à quantifier la production fruitière de l’espèce et à identifier les prédateurs et disperseurs des fruits. Trente-neuf collecteurs circulaires ont été installés sous les houppiers, les données récoltées (nombre et masse des fruits) étant ensuite mises en relation avec le diamètre. Par ailleurs, sept semenciers ont fait l’objet d’observations indirectes grâce à un dispositif de caméras-pièges. Les premières fructifications apparaissent sur les semenciers à partir de 12,3 cm de diamètre. Elle se produit de janvier à avril. Les quantités de fruits sont corrélées positivement au diamètre (r² = 0,493 ; p = 0,001). Dix espèces animales ont été observées aux pieds des arbres en fruits, leur rôle dans la dynamique de population de l’espèce est potentiellement important. [less ▲]

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See detailTon d'instit ?
Lambeau, Céline ULg

Conference (2011, November 15)

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See detailGas Flow Simulations in a Structured Packing by Lattice Boltzmann Method
Beugre, Djomice; Calvo, Sébastien ULg; Crine, Michel ULg et al

Conference (2011, November 15)

Numerical simulations of gas flow between two sheets of plastic MellapakTM 250 Y are performed using Lattice Boltzmann methods in laminar and turbulent regimes. Results are compared with experimental ... [more ▼]

Numerical simulations of gas flow between two sheets of plastic MellapakTM 250 Y are performed using Lattice Boltzmann methods in laminar and turbulent regimes. Results are compared with experimental measurements and with known correlations. They are also compared with simulations using a classical CFD code. In all cases, the agreement is very good. [less ▲]

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See detailLe projet d'enfant des couples lesbiens recourant à l'IAD
Naziri, Despina ULg; Dargentas, Magda

Conference (2011, November 15)

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See detailModelling of frictional unilateral contact in automotive differentials
Virlez, Geoffrey ULg; Cardona, Alberto; Bruls, Olivier ULg et al

Conference (2011, November 14)

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See detailQuelques caractérisations des espaces de Hölder généralisés
Kreit, Damien ULg

Conference (2011, November 14)

Detailed reference viewed: 26 (4 ULg)
See detailDevelopment of a thorax CT-scan based finite element model for thoracic injury assessment
Nsiampa, Nestor; D'Otreppe, Vinciane ULg; Robbe, Cyril ULg et al

Conference (2011, November 14)

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See detailEfficient evaluation of the geometrical validity of curvilinear finite elements
Johnen, Amaury ULg; Remacle, Jean-François; Geuzaine, Christophe ULg

Conference (2011, November 14)

The development of high-order numerical techniques on unstructured grids has been underway for many years. The accuracy of these methods strongly depends of the accuracy of the geometrical discretization ... [more ▼]

The development of high-order numerical techniques on unstructured grids has been underway for many years. The accuracy of these methods strongly depends of the accuracy of the geometrical discretization, and thus depends on the availability of quality curvilinear meshes. The usual way of building such curvilinear meshes is to first generate a straight sided mesh. Then, mesh entities that are classified on the curved boundaries of the domain are curved accordingly. Some internal mesh entities may be curved as well. If we assume that the straight sided mesh is composed of well shaped elements, curving elements introduces a kind of "shape distortion" that should be controlled so that the final curvilinear mesh is also composed of well shaped elements. In this work we propose a method to analyze curvilinear meshes in terms of their elementary jacobians. The method does not deal with the actual generation of the high order mesh. Instead, it provides an efficient way to guarantee that a curvilinear element is geometrically valid, i.e., that its jacobian is strictly positive in all its reference domain. It also provides a way to measure the distortion of the curvilinear element. The key feature of the method is to adaptively expand the elementary jacobians in a polynomial basis, built using Bézier functions, that has both properties of boundedness and positivity. The algorithm has been implemented in the open-source mesh generator Gmsh, and allows to control the geometrical validity of curvilinear meshes made of triangles, quadrangles, tetrahedra, hexahedra and prisms of any order. [less ▲]

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See detailImage-based Finite Element Mesh Generation for Microstructures
D'Otreppe, Vinciane ULg; Mengoni, Marlène ULg; Boman, Romain ULg et al

Conference (2011, November 14)

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See detailTopology optimization of compliant mechanisms: Application to vehicle suspensions.
Tromme, Emmanuel ULg; Lemaire, Etienne ULg; Duysinx, Pierre ULg

Conference (2011, November 14)

An efficient method to design a compliant vehicle suspension with only topology optimization.

Detailed reference viewed: 89 (16 ULg)
See detailEffect of drug candidates for the treatment of Alzheimer's disorber on hippocampus-dependent learning, glutamate receptors and mitochondria
Vignisse, Julie ULg; Steinbusch, H.W.M; Bolkunov, A. et al

Conference (2011, November 12)

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See detailRaymond Lemaire and History of Architecture Applied to Urbanism
Houbart, Claudine ULg

Conference (2011, November 10)

“I don’t have the pretention of having created a new trend in urbanism. I am simply convinced that there is more genius and intelligence in the long experience accumulated by the generations, facing the ... [more ▼]

“I don’t have the pretention of having created a new trend in urbanism. I am simply convinced that there is more genius and intelligence in the long experience accumulated by the generations, facing the problems of life, than in one single man’s head, even brilliant”. Raymond Lemaire synthesizes, in these words, in 1988, his vision of urbanism, in an interview on his project of Port-la-Rochette, a neo-traditional tourist centre on the shore of one of the Eau d’Heure Lakes . During his whole career, but more particularly in the 1970’s and 1980’s, Lemaire has skilfully used his abilities as an architectural historian to put forward an alternative vision of the city to the more and more questioned modernism. Experimented through many projects all over the country, the methodology set up following the renovation works of the Groot Begijnhof of Leuven (1964-1971) is applied to some of the fragments of ancient urban fabric that subsist in Brussels, threatened by construction projects and “progressive” urbanism. For the association Quartier des Arts or the city administration, he works not only on conservation projects of buildings within these areas, but also on the elaboration of normative plans supposed to guarantee the harmonious continuity of the new and the ancient built environment. This is a real application of history of architecture to prospective urbanism, the extreme expression of which can be seen in the design of Louvain-la-Neuve, that cannot be detached from Lemaire’s experience in urban renewal. This contribution will attempt to examine the modes according to which Lemaire uses his historical knowledge to put forward a new vision of the ancient city, through case studies in Brussels, often not realized. Theses case studies can bring some light on certain aspects of historicist urbanism, its political implications, and also its limits. [less ▲]

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See detailAnalysis of historical grating spectra: Jungfraujoch atmospheric database extended back to 1977
Demoulin, Philippe ULg; Roland, Ginette; Bader, Whitney ULg et al

Conference (2011, November 10)

Historical solar spectra recorded at the Jungfraujoch station with a high-resolution grating spectrometer have been re-analyzed to derive total columns of a series of atmospheric gases. This instrument ... [more ▼]

Historical solar spectra recorded at the Jungfraujoch station with a high-resolution grating spectrometer have been re-analyzed to derive total columns of a series of atmospheric gases. This instrument, built and operated by the University of Liège (Belgium), was used in the Sixties and Seventies to record two solar spectrum atlases extending from the near-UV to the near-IR. From 1977 to 1989, it was also regularly used to record narrow spectral intervals in the mid-infrared, encompassing absorption lines of gases of atmospheric interest, e.g. CH4, HF, HCl, H2O, N2O, NO2, C2H6, O3 and CO. More than 10 thousand spectra were recorded during this period. The total columns derived from these grating spectra have been combined with the FTIR columns derived at the Jungfraujoch since the mid-1980s, in order to derive the temporal evolution of various target gases for the period 1977-2011. [less ▲]

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See detailProspects for performing «responsible innovation» in research institutions
Thoreau, François ULg

Conference (2011, November 09)

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See detailInnovation : relations entre universités et entreprises
Artige, Lionel ULg

Conference (2011, November 09)

Detailed reference viewed: 77 (12 ULg)
See detailComparisons of long-term stratospheric nitric acid and hydrogen fluoride variations using satellite and ground-based measurements
Froidevaux, L.; Anderson, J.; Hannigan, J. et al

Conference (2011, November 09)

We investigate the long-term variations of stratospheric nitric acid (HNO3) and hydrogen fluoride (HF), based on several satellite and ground-based measurement records. We use results from the Upper ... [more ▼]

We investigate the long-term variations of stratospheric nitric acid (HNO3) and hydrogen fluoride (HF), based on several satellite and ground-based measurement records. We use results from the Upper Atmosphere Research Satellite (launched in late 1991 and decommissioned in late 2005), the Aura satellite (launched in summer 1991, with on-going measurements), and the Atmospheric Chemistry Experiment Fourier Transform Spectrometer (ACE-FTS) (from 2004 to present), in conjunction with several long-term ground-based datasets from the Network for the Detection of Atmosphere Composition Change (NDACC). In particular, we investigate the time series of HNO3 and HF, using NDACC column data for validation. We focus here on a few NDACC sites with long-term and frequent measurements, namely the Jungfraujoch (45N, 8E), Lauder (45S, 170E), and Mauna Loa (20N, 204E) sites, where ground-based Fourier Transform Infrared (FTIR) measurements have covered both the UARS and Aura time periods (1991 to present). For HNO3, we investigate whether there are indications of a systematic offset between the measurements by the Microwave Limb Sounder (MLS) instruments aboard both UARS and Aura. For hydrogen fluoride, the HALogen Occultation Experiment's HF time series are connected to the ACE-FTS dataset, and we analyze the correlation of this time series with the ground-based datasets. In addition, model runs from the Whole Atmosphere Community Climate Model (WACCM) and the TOMCAT/SLIMCAT model are used as part of the long-term time series intercomparisons. We note that there is a significant time gap in the HNO3 time series from the satellite measurements used here. The long-term satellite datasets studied here include zonal average Earth Science Data Records (ESDRs) being produced under the Global Ozone Chemistry And Related trace gas Data records for the Stratosphere (GOZCARDS) project, part of the NASA Making Earth Science data records for Use in Research Environments (MEaSUREs) program. We also analyze coincident-type measurements, for the comparisons between satellite and ground-based observations. [less ▲]

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See detailPolitics of biotechnology in Latin America: the RR soybean Argentina case study
Delvenne, Pierre ULg

Conference (2011, November 08)

The presentation is based on Argentina and it focuses on biotechnology in agriculture. Argentina today is the second largest exportator of GM crops and it has been the first country in Latin America to ... [more ▼]

The presentation is based on Argentina and it focuses on biotechnology in agriculture. Argentina today is the second largest exportator of GM crops and it has been the first country in Latin America to establish a professional regulatory framework in the early 1990s. Round Up Ready (RR) soybean crops is specifically analysed because of its importance — more than 60% of the cultivated areas — and its controversial aspect : it is presented at the same time as an elixir for agro-industrial ills and as a techno-economic network increasing the benefits of the global North while dramatically affecting public health and the environment. We suggest to diagnose developments and perceptions of issues related to health, economy, ecological diversity, fertility of soils, regulation and intellectual property. Our methodology favours qualitative data collection and analysis, while using quantitative data when available and relevant. [less ▲]

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See detailL'insuffisance rénale : fatalité liée à l'âge?
Krzesinski, Jean-Marie ULg

Conference (2011, November 08)

Detailed reference viewed: 13 (0 ULg)
See detailMarine predators as sentinels for our oceans and human health
Das, Krishna ULg; Bouquegneau, Jean-Marie ULg

Conference (2011, November 08)

“During the course of the 20th century, the planet became and is now chemically different from any previous time”. (1) Organic and inorganic chemicals occur in greater abundance because of human activity ... [more ▼]

“During the course of the 20th century, the planet became and is now chemically different from any previous time”. (1) Organic and inorganic chemicals occur in greater abundance because of human activity and end up in the ocean. As more humans inhabit coastal regions, question arises about the health of our oceans. Marine vertebrates such as marine fish, turtles, birds and mammals are used to get early warning about negative trends and impact linked to anthropogenic activities. Such organisms are qualified as sentinel species (2). In turn, sentinels will permit us to better characterize and potentially manage negative impacts on human and animal health associated with our oceans. Marine predators including marine mammals and birds can present elevated concentrations of these organic and inorganic chemicals in their tissues, due to their high position in the trophic chain, their life span, and their fat store in which lipophilic chemicals accumulate. Humans and marine predators share common routes of exposures such as (1) the maternal transfer through placenta and milk and (2) trophic transfer through ingestion of marine fish and shellfish. Furthermore, some human population rely on marine mammal consumption for subsistence. Marine predators offer a snapshot of ocean health that could potentially impact human health. In the hope that this paper will stimulate the research much needed for assessing ocean health in the context of a rapidly changing environment, we provide here a review of (i) levels and trends of contaminants and relationships with biotic and abiotic factors, (ii) toxicological effects and (iii) spatial and geographical trends in tissues of marine predators. We conclude this communication by presenting several necessary perspectives such a more thorough follow of organic and inorganic pollutants in the marine environment including the use of isotopic tracers to assess the local versus global aspects of marine pollution. (1) Reddy, C. M., Stegeman, J. J. & Hahn, M. E. in Oceans and human Health (eds P.J. Walsh et al.) 121-144 (Academic Press, 2008). (2) Bossart G.D. (2011). Vet. Path. 48:676-690. [less ▲]

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See detailYet Another Story of Networks! Prospects for Performing "Responsible Innovation"
Thoreau, François ULg

Conference (2011, November 05)

Detailed reference viewed: 31 (3 ULg)
Peer Reviewed
See detailEtude de prévalence du burnout dans la population des travailleurs belges
Schippers, Nathalie ULg; DE CIA, Julie ULg; Barbier, Marie ULg et al

Conference (2011, November 04)

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See detailVacant properties in Liege: An introduction to the case studies
Halleux, Jean-Marie ULg

Conference (2011, November 04)

Detailed reference viewed: 16 (1 ULg)
See detailRécits de vie, récits de fondation, autour des annonciades de Saint-Mihiel
Henneau, Marie-Elisabeth ULg

Conference (2011, November 04)

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See detailAppui à la gestion et à la protection des ressources en eaux souterraines exploitées dans la région de Bobo Dioulasso (Burkina Faso) – mise en place d’une base de données spatiales
Sauret, Elie ULg; Gardin, Nicolas; Kam, Ahmed et al

Conference (2011, November 03)

Située au sud ouest du Burkina Faso, dans la région de Bobo Dioulasso, le bassin du kou couvre 1860km2 de superficie et héberge d’énormes réservoirs en eau souterraines auxquels sont associés ... [more ▼]

Située au sud ouest du Burkina Faso, dans la région de Bobo Dioulasso, le bassin du kou couvre 1860km2 de superficie et héberge d’énormes réservoirs en eau souterraines auxquels sont associés d’importantes sources diffuses. Ces réserves en eau sont sollicitées pour l’alimentation en eau de boisson, l’industrie, l’agriculture irriguée et l’élevage ; elles ont été et demeure l’objet de nombreuses études touchant l’ingénierie de l’eau et des sols, l’imagerie satellitaire et géophysique, l’hydrochimie…. Depuis 2005, le projet de coopération bilatérale entre la WBI1 et le MAHRH-BF2 dénommé : « Appui à la gestion et à la protection des ressources en eaux souterraines exploitées dans la région de Bobo – Dioulasso » a permis de collecter, compiler et archiver des données (numériques, papiers, cartes…) qui ont servi à la construction d’une base de données spatiales couplées à un SIG (ArcGis). Des post-traitements de ces données ont permis l’établissement de cartes thématiques sur les ressources en eau de la région : carte hydrogéologique, carte de la vulnérabilité intrinsèque des aquifères souterrains, carte hydrogéomorphologique…….Utilisée au sein du projet pour les travaux de thèse en cours, la GDB des ressources en eau du bassin du Kou est largement vulgarisée et diffusée à l’échelle régionale et nationale aux utilisateurs et acteurs du domaine de l’eau. [less ▲]

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See detailBehind Rossmo's assumptions: further hypotheses to make geographic profiling more operational
Trotta, Marie ULg

Conference (2011, November 03)

Funded by the Belgian National research fund (FRS-FNRS), I am currently collaborating with several services of the federal police of Belgium (strategic, operational and behavioural analysts) to develop ... [more ▼]

Funded by the Belgian National research fund (FRS-FNRS), I am currently collaborating with several services of the federal police of Belgium (strategic, operational and behavioural analysts) to develop operational techniques to implement geographic profiling – including temporal aspects of crime scene – on the Belgian territory. Belgium is characterized by a small and highly populated territory with a complex road network; which require more concerns about its geographical features than the regular grids of American cities. <br /> <br />From an operational perspective, few studies have focused on the conditions favouring the application of GP. Rossmo defined five criteria for effective likelihood surface, but these criteria are often difficult to verify with the data gathered during the investigations. This presentation proposes to study the relationships between those applicability hypotheses, crime types, and spatio-temporal aspects of the crime in order to better predict the surface effectiveness. <br /> <br />Then, we discuss the difficulty to meet those assumptions for serial rapes in Belgium. Non-uniform pattern and multiple residences for offenders are some of the factors hampering those assumptions. <br /> <br />An unsolved case of rapes submitted by the police illustrates how a GP reasoning is still possible when Rossmo’s criteria are not met. The objective was to delineate a priority area around crime locations for DNA testing as the offender was assumed to be local. The series presents a pattern focusing on two different city centers. For this reason, the likelihood surface was generated under a different assumption than the classical distance decay. Indeed, our analysis of the crimes pattern in relation to the road network points out a new hypothesis for the offender’s spatial behaviour: spatial consistency in travelled distances to commit the crimes instead of a distance decay function. <br /> <br />This hypothesis was supported by an analysis of the ‘neutrality’ of the series crime locations. Brantingham distinguished crime generators/attractors from neutral places as a function of the attractiveness of place. According to him, distance decay functions can only be applied to neutral places. In our series, it appears that only one location was located in rural area, in a very unattractive place for rapes. By contrast, the others were located in the city centers or near night clubs. We concluded that there was a high probability for the offender to come from this village. Subsequent DNA analyses of the residents of that village confirmed our hypothesis. [less ▲]

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See detailLe nozze (e l’imminente divorzio) di Filologia e Metrica
Valenti, Gianluca ULg

Conference (2011, November 03)

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See detailEnvironmental performance of waste management through years using Life Cycle Assessment
Belboom, Sandra ULg; Renzoni, Roberto ULg; Digneffe, Jean-Marc et al

Conference (2011, November 03)

Detailed reference viewed: 36 (11 ULg)
Peer Reviewed
See detailEvolving trends in Latin American politics of biotechnologies: delving into the “GM soya model” in Argentina
Delvenne, Pierre ULg; Vara, Ana Maria; Vasen, Federico

Conference (2011, November 02)

Our interest is to understand the challenges to modern science and innovation regimes under conditions of globalization and “multiple modernities” (Eisenstadt 2000). Different scholarly attention has been ... [more ▼]

Our interest is to understand the challenges to modern science and innovation regimes under conditions of globalization and “multiple modernities” (Eisenstadt 2000). Different scholarly attention has been paid to existing institutions that may no longer be adequate to address those challenges. This may be because modern institutions are pressured for a greater reflexive opening up of their structures (Beck and Lau 2005) or because the modern world-system is facing severe turbulences that would ultimately lead to a time of structural dissolution (Wallerstein 2005). This renders it interesting to trace the responses to these challenges, and we suggest doing it in the field of STS. Our ongoing multi-level comparative research takes Latin American countries as an entrance point to finding responses that are different from those occurring in European countries. Our presentation is based on Argentina and it focuses on biotechnology in agriculture. Argentina today is the second largest exporter of GM crops and it has been the first country in Latin America to establish a professional regulatory framework in the early 1990s. GM soya crop is specifically analysed because of its importance — more than 60% of the cultivated areas — and its controversial aspect : it is presented at the same time as an elixir for agro-industrial ills and as a techno-economic network increasing the benefits of the global North while dramatically affecting public health and the environment. We suggest diagnosing developments and perceptions of issues related to health, economy, ecological diversity, fertility of soils, regulation and intellectual property. [less ▲]

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See detailManage depleated lands on the outskirts of Kinshasa. A landscape approach for a simple management plan development.
Vermeulen, Cédric ULg; Dubiez, Emilien; Peltier, Régis et al

Conference (2011, November)

Detailed reference viewed: 18 (3 ULg)
Peer Reviewed
See detailAntibody evasion by a gammaherpesvirus O-glycan shield.
Machiels, Bénédicte ULg; Gillet, Laurent ULg

Conference (2011, November)

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See detailDam break flow modelling with uncertainty analysis
Dewals, Benjamin ULg; Archambeau, Pierre ULg; Erpicum, Sébastien ULg et al

Conference (2011, November)

The failure of a large dam may result in catastrophic floods in the downstream valley. However, past experience has revealed that loss of life and damage can be drastically reduced if crisis management is ... [more ▼]

The failure of a large dam may result in catastrophic floods in the downstream valley. However, past experience has revealed that loss of life and damage can be drastically reduced if crisis management is planned in advanced, including early-warning systems, organized communication and structural measures. This requires a fairly good knowledge of the inundation characteristics likely to be induced in case of a failure. Predictions of flood waves induced by dam failure are affected by a considerable level of uncertainty. Due to the extreme nature of such events, numerical models can hardly be calibrated and validated. Flow resistance parameterizations are designed for ranges of flow properties which significantly differ from those occurring during dam break flows. Large amounts of debris may also be transported by the flow and the details of the failure scenario remain usually unknown, such as sequence of dislodgement of dam wall fragments or breach formation time (e.g., Dewals et al. 2011). Nonetheless, most dam break flow studies so far have been conducted without systematic uncertainty nor sensitivity analyses. This is partly due to the high computational cost of the multidimensional flow models used to simulate dam break flows on natural topography. We present here the simulation of a real dam break flow with a systematic analysis of the uncertainty resulting from the roughness coefficient, the failure hydrograph and topographic data. The flow simulations have been conducted with the model WOLF 2D developed at the University of Liege. It solves the fully dynamic shallow-water equations based on a finite volume scheme and a self-developed flux-vector splitting (Erpicum et al. 2010a; Erpicum et al. 2010b). Monte-Carlo simulations have been used to perform the uncertainty analysis. The two-dimensional flow model is computationally too costly to perform a high number of repeated runs, as needed for Monte Carlo simulations. Therefore, a “reduced complexity model” has been set up, in the form of multidimensional Hermite polynomials. The method developed by Isukapalli et al. (Isukapalli et al. 2004) indicates the number of simulations of the complete model needed to calibrate the polynomials, as well as the parameter values to be used in these calibration runs. The methodology has been tested for a real dam break which occurred in Spain in 1982 (Alcrudo and Mulet 2007) and for which a number of observations are available (mainly maximum water depths at different locations in a town). The presentation will show the applicability and efficiency of the methodology, which is readily available for real-world analyses. Such uncertainty analysis for dam break flows disclose crucial information for practical risk management. In particular, they reveal that the uncertainty ranges on maximum water depth and time of arrival of the front are not symmetric (overestimation vs. underestimation) and very unevenly distributed in space. [less ▲]

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See detailCoupling approach in building physics.
Barbason, Mathieu ULg; Reiter, Sigrid ULg

Conference (2011, November)

CFD and Multizone Simulations can be coupled to improve their performance. This presentation tackles the possibilities of this technique and its difficulties.

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See detailUsing the course syllabus to document the quality of teaching and identifying its most useful items according to the students
Leduc, Laurent ULg

Conference (2011, November)

Alongside its well-known functions of contract or communication tool, the course syllabus would also represent a suitable evidence of teaching quality. Indeed, for the last decade, more references to ... [more ▼]

Alongside its well-known functions of contract or communication tool, the course syllabus would also represent a suitable evidence of teaching quality. Indeed, for the last decade, more references to syllabi is being recommended in faculty evaluation and in accreditation reviews. This paper first discusses the use of syllabus items in documenting and increasing the quality of course planning according to the literature. Secondly, in order to inspire institutions in their choices of the most valuable syllabus items, this paper reports the result of a survey lead at the University of Liège in order to identify the most useful generic components to be included in course syllabi according to students’ opinion. Items like Assessment methods and criteria; Learning objectives/outcomes; Recommended or required readings and Learning advices appeared to be among the most wanted ones. [less ▲]

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See detailBoolean methods in operations research and related areas
Crama, Yves ULg

Conference (2011, November)

These are the slides of the "IFORS Distinguished Lecture" that I delivered at the INFORMS Annual meeting in November 2011. The title of the lecture is the title of a monograph co-authored by Peter L ... [more ▼]

These are the slides of the "IFORS Distinguished Lecture" that I delivered at the INFORMS Annual meeting in November 2011. The title of the lecture is the title of a monograph co-authored by Peter L. Hammer and Sergiu Rudeanu, which appeared in 1968. Their pioneering work has stimulated a large amount of research and has been very frequently cited. Over the last year, the late Peter Hammer and myself have published two distant follow-ups to this classical book: a monograph entitled Boolean Functions: Theory, Algorithms, and Applications (700 pages, Cambridge University Press, 2011), and a collection of survey papers on Boolean Models and Methods in Mathematics, Computer Science and Engineering (780 pages, Cambridge University Press, 2010). The size of these two volumes and of their bibliographic sections are witnesses of the vitality of the field and of its impressive development. Boolean functions are actually among the most fundamental objects investigated in mathematics, and provide the basic building blocks for many models arising in operations research, computer science, artificial intelligence, economics, engineering, cryptography, biology, and other fields of application. In this lecture, I propose a brief overview of some fundamental Boolean models, I discuss applications in corporate governance (modeling of shareholders’ power) and in classification (Logical Analysis of Data), and I mention a few challenging research problems. [less ▲]

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See detailAssisted Natural Regeneration (ANR): a tool for degraded tropical forests rehabilitation in Central Africa
Peltier, Régis; Proces, Pierre; Marquant, Baptiste et al

Conference (2011, November)

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See detailThe clinical and economic implications of non-adherence with osteoporosis medications in Ireland
Hiligsmann, Mickaël ULg; McGowan, Bernie; Bennett, Kathleen et al

Conference (2011, November)

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See detailComparison of Machine Learning techniques for atmospheric pollutant monitoring in a Kraft pulp mill
Sainlez, Matthieu ULg; Heyen, Georges ULg

Conference (2011, November)

In this paper, machine learning techniques are compared to predict nitrogen oxide (NOx) pollutant emission from the recovery boiler of a Kraft pulp mill. Starting from a large database of raw process data ... [more ▼]

In this paper, machine learning techniques are compared to predict nitrogen oxide (NOx) pollutant emission from the recovery boiler of a Kraft pulp mill. Starting from a large database of raw process data related to a Kraft recovery boiler, we consider a regression problem in which we are trying to predict the value of a continuous variable. Generalization is done on the worst case configuration possible to make sure the model is adequate: the training period concerns stationary operations while test periods mainly focus on NOx emissions during transient operations. This comparison involves neural network techniques (i.e., static multilayer perceptron and dynamic NARX network), tree-based methods and multiple linear regression. We illustrate the potential of a dynamic neural approach compared to the others in this prediction task. [less ▲]

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See detailLes nouveaux défis du développement territorial
Teller, Jacques ULg

Conference (2011, November)

Dans le cadre des travaux d’actualisation du SDER, le Gouvernement Wallon a retenu six défis prioritaires : la démographie, le climat, l’énergie, la compétitivité, la cohésion sociale et la mobilité. Les ... [more ▼]

Dans le cadre des travaux d’actualisation du SDER, le Gouvernement Wallon a retenu six défis prioritaires : la démographie, le climat, l’énergie, la compétitivité, la cohésion sociale et la mobilité. Les différences de nature et de statut de ces défis sont manifestes. Nous avons toutefois retenu trois grands traits communs dans le cadre de leur définition : les défis sont pour partie exogènes au territoire wallon ; ils sont de nature « politique » et ils n’étaient pas suffisamment pris en compte dans le SDER 99. La CPDT s’est dès lors attachée à clarifier les pressions que ces défis imposent sur le territoire. L’accent a été mis sur la manière dont les défis se traduisent spécifiquement sur notre territoire, en identifiant les tendances observées et les hypothèses d’évolution aux horizons 2020 et 2040 pour la Wallonie. [less ▲]

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See detailConversion of a B-Rep CAD model to an implicit representation in the context of the X-FEM
Mouton, Thibaud ULg; Béchet, Eric ULg

Conference (2011, November)

This paper deals with the alternative representation of parametric CAD models in the context of the Extended Finite Element Method (X-FEM) [1]. Partition of unity methods like the X-FEM allows to embed in ... [more ▼]

This paper deals with the alternative representation of parametric CAD models in the context of the Extended Finite Element Method (X-FEM) [1]. Partition of unity methods like the X-FEM allows to embed in finite element functional spaces any discontinuity. It is so theoretically possible to simulate a complete model without any of its geometrical features appearing in the mesh. Nevertheless, X-FEM was at first only used in geometrically simple application (e.g. cracks) due to the lack of method to make features of a complex CAD model to implicitly appear in the functional spaces. The geometry of the crack was originally modeled using Level Sets because of their ability to handle complex surfaces and naturally take into account changes in topology and geometry encountered with moving interfaces. Level Sets modelling has been recently extended in combination with a Constructive Solid Geometry (CSG) approach [2] but this method is still limited by the use of globally defined Level Sets. The proposed algorithm extends the Level Sets modelisation of the geometry using the Boundary Representation (B-Rep) of the object. In this case, Level Sets are only locally defined (Fig a). A sub- mesh is then obtained by cutting a primary fixed mesh (encompassing the CAD model) along with isozero of each Level Set (Fig b). Resulting sub-elements are then sorted to build a temporary topology. One of the difficulties involved is then to match the temporary topology with the original B-Rep topology (Fig c). The aim is to recover unmodified entities and detect deleted or new entities that could appear during the deformation of the object. Finally, examples of computations in linear elasticity will be shown. [less ▲]

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See detailLa lecture herméneutique du logos
Gauvry, Charlotte ULg

Conference (2011, November)

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