Publications ORBi OA
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See detailThe clinical and economic burden of nonadherence with oral bisphosphonates in osteoporotic patients
Hiligsmann, Mickaël ULg; Rabenda, Véronique ULg; Reginster, Jean-Yves ULg

in Annals of the Rheumatic Diseases (2009, June), 68(S3), 667

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See detail2 2009 Expérience pilote PIT : mise en œuvre d’équipes infirmières dans 10 ambulances participant à l’aide médicale urgente en Belgique. Bilan au terme de la 2e année d’activité
STAMATAKIS, Lambert; TODOROV, Pierre; BRONSELAER, Koen et al

in Journal Européen des Urgences = European Journal of Emergencies (2009), 22(S2),

L'article fait le bilan de l'expérience de moyens de secours à accompagnement infirmier sur base de deux ans de données d'intervention. Il conclut de l'analyse statistique que le temps d'intervention est ... [more ▼]

L'article fait le bilan de l'expérience de moyens de secours à accompagnement infirmier sur base de deux ans de données d'intervention. Il conclut de l'analyse statistique que le temps d'intervention est réduit, que les actes posés sont comparables, et que la gestion de la douleur est améliorée. [less ▲]

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See detailAnnotation of Lokangaka Losambe's "Death, Power and Cultural Translation in Wole Soyinka's Death and the King's Horseman"
Tunca, Daria ULg

in Routledge Annotated Bibliography of English Studies (2009)

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See detailBanc polarimétrique de mesure de masques de phase pour la coronographie
Piron, Pierre ULg

Master's dissertation (2009)

Ce travail comprend deux parties. La première partie replace la coronographie dans son contexte historique (détection des exoplanètes) et scientifique (différentes théories physiques et leur développement ... [more ▼]

Ce travail comprend deux parties. La première partie replace la coronographie dans son contexte historique (détection des exoplanètes) et scientifique (différentes théories physiques et leur développement mathématique). Elle présente les qualités et les défauts des différents masques utilisés dans les coronographes. A l’origine, la coronographie est une technique utilisée en astronomie pour reproduire une éclipse totale de soleil. Depuis la découverte de la première exoplanète en 1995, la coronographie est en pleine (r)évolution : elle s’efforce de donner une image d’un compagnon faible qui orbite autour d’une étoile brillante. Grâce à la spectroscopie, une image peut fournir des informations inaccessibles aux autres méthodes de détection (présence d’eau, de vie, ...). La chromaticité (dépendance à la longueur d’onde de travail) est le défaut le plus gênant pour un masque coronographique ; les chercheurs rivalisent donc d’ingéniosité pour améliorer sans cesse les performances et repousser toujours plus loin les limites instrumentales. Dans les années 2000, les masque de phase apparaissent : ils produisent un déphasage soit par différence de chemin optique (masques chromatiques : DPM, 4QPM) soit par opposition de phase entre les composantes électrique et magnétique de la lumière (masques achromatiques : 4QAPS, 4ZOG, AGPM). L’interférence destructive due au déphasage provoque l’atténuation totale ou partielle d’une source lumineuse centrée (une étoile). Par contre, la lumière d’une source décentrée (une étoile faible voisine, une planète qui orbite autour de l’étoile) n’est pas ou peu atténuée. Ce principe explique le rôle joué par la coronographie dans la détection des exoplanètes. Grâce à leur biréfringence de forme, les réseaux sublambda de type ZOG créent une différence de phase entre les composantes électrique et magnétique de la lumière. Le masque de phase à quatre quadrants 4ZOG est formé de quatre ZOGs orientés pour créer une opposition de phase entre deux quadrants adjacents. L’Annular Groove Phase Mask (AGPM) est un réseau ZOG "space-variant" qui génère un vortex optique avec une interférence destructive au centre. L’optimisation de la configuration spatiale d’un ZOG (pas du réseau, profondeur de gravure, facteur de remplissage, ...) améliore ses performances optiques mais une erreur sur le déphasage est toujours possible. Elle est due au manque de précision lors de la fabrication par lithographie. Le défi actuel à relever est de trouver une technologie de fabrication plus fiable : les Liquid Crystal Polymers semblent prometteurs. La deuxième partie est plus pratique : elle présente le banc de mesure mis au point à l’Hololab de la Faculté des Sciences de l’Université de Liège. Il est prévu pour travailler dans les bandes infrarouges H et K qui sont couramment utilisées en astronomie, notamment pour la détection des exoplanètes. Il est destiné à mesurer le déphasage produit par les retardateurs de phase (phase shifters), entre autres, les masques de phase utilisés en coronographie : des plus simples (lames quart d’onde, lames demi-ondes) aux plus sophistiqués (masques de phase de type ZOG) en passant par les rhomboèdres de Fresnel (réflection totale interne). Cette partie décrit les différents composants et leur mise au point initiale, le principe polarimétrique de son fonctionnement, le programme LabVIEW qui commande les polariseurs mobiles et la prise de mesure par le détecteur, les modules MATLAB qui traitent les données, les limites actuelles à son fonctionnement (vitesse de fonctonnement, précision des mesures, stabilité des mesures, ...) Un chapitre présente les résultats expérimentaux obtenus pour quelques échantillons testés : une lame quart d’onde avec le laser à 1.55 m, la même lame avec le laser à 2.3 m, un rhomboèdre de Fresnel avec le laser à 1.55 m. [less ▲]

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See detailDesigning the Malqaf for summer cooling in low-rise housing an experimental study
Attia, Shady ULg; De Herde, André

in Proceedings of Passive and Low Energy Architecture (PLEA) 2009 (2009, June)

The malqaf or windcatcher is Egyptian vernacular archetypal device that traps the wind into the building. For centuries, the malqaf has been used as a viable solution to ensure natural ventilation ... [more ▼]

The malqaf or windcatcher is Egyptian vernacular archetypal device that traps the wind into the building. For centuries, the malqaf has been used as a viable solution to ensure natural ventilation. However, for the last 50 years, Egyptian practice has failed in combining traditional architectural devices into new techniques that could lead to sustainable and energy aware buildings. In Egypt, more than half of the urban peak load of energy consumption in the mean time is used to satisfy air conditioning demands alone. Therefore, the objective of the research is to develop a viable passive alternative to active cooling by exploring the potentials and design parameters of windcatchers as solution for passive cooling and natural ventilation during the summer season for low-rise housing. Experimental wind tunnel and smoke visualisation testing were conducted to compare the air flow in a scale model room with and without windcatcher on top of the roof with different orientations. The final result shows that the performance of the windcatcher depends greatly on the position, orientation and size of the inlet and outlet opening in relation to the wall ratio. The study developed a comparative matrix for examined parameters to support architects with the basic principles for windcatchers design. [less ▲]

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See detailMultigoal Output Regulation Via Supervisory Control: Application to Stabilization of a Unicycle.
Efimov, Denis ULg; Panteley, Elena; Loria, Antonio

in Proc. American Control Conference, St. Louis (2009)

We consider the problem of robust output regulation for nonlinear systems in the following sense: given a system with input disturbances, we are interested in steering one output to zero while tolerating ... [more ▼]

We consider the problem of robust output regulation for nonlinear systems in the following sense: given a system with input disturbances, we are interested in steering one output to zero while tolerating an steady-state error on the second output. In other words, we are interested in input-output (asymptotic) stability for one output and practical (asymptotic) stability for the second. Upon the assumption that we dispose of two controllers each of which achieves separately a control objective (for either output) we propose a switching rule to commute between the two controllers appropriately i.e., conserving the input-output stability, to some extent. The problem studied is reminiscent of different concrete situations such as simultaneaous synchronization and tracking control of mechanical systems; in this article we revisit the problem of stabilizing a unicycle (regulation of the first output) towards a point while ensuring obstacle-collision avoidance (practical stabilization of the second output). [less ▲]

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See detailBeside recession and regional elections: which way out for the European elections ?
Grandjean, Geoffrey ULg

Article for general public (2009)

At the end of December 2008, Yves Leterme (CD&V – Flemish Christian Democrat party) has given up his place as Prime Minister. His resignation has put an end to the political crisis in Belgium. Yves ... [more ▼]

At the end of December 2008, Yves Leterme (CD&V – Flemish Christian Democrat party) has given up his place as Prime Minister. His resignation has put an end to the political crisis in Belgium. Yves Leterme has been replaced by Herman Van Rompuy (CD&V). On the 7th of June there will be two kinds of elections in Belgium: European and regional elections. What is really at stake in this context? Can a European issue emerge among the omnipresent discussions on the future of Belgium? [less ▲]

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See detailValoriser ses acquis en pédagogie par l'élaboration d'un portfolio: Du dispositif aux compétences
Deum, Mélanie ULg

Conference given outside the academic context (2009)

Dans la lignée des formations obligatoires des nouveaux assistant(e)s et chargé(e)s de cours, l’Université de Liège, par l’intermédiaire de l’IFRES (Institut de Formation et de Recherche en Enseignement ... [more ▼]

Dans la lignée des formations obligatoires des nouveaux assistant(e)s et chargé(e)s de cours, l’Université de Liège, par l’intermédiaire de l’IFRES (Institut de Formation et de Recherche en Enseignement Supérieur) a mis en œuvre un portfolio de valorisation de la facette « pédagogique » du métier d’encadrant universitaire. Ce portfolio poursuit deux objectifs, d’une part la mise en avant des compétences professionnelles développées par l’encadrant en matière de pédagogie et de didactique et, d’autre part, au travers de démarches réflexives notamment, l’amélioration de l’enseignement. En ce qui concerne cette communication, nous nous proposons de vous faire part de la présentation de notre dispositif de formation, de la place qu’y prend le portfolio et de la structure de ce dernier. Nos premières analyses porteront sur la manière dont le portfolio est investi par les encadrants de l’ULg et sur les compétences mises en avant dans cet outil par les encadrants eux-mêmes. Nous nous intéresserons également aux finalités assignées à cet outils et sur les avantages retirés. [less ▲]

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See detailDélinquance juvénile et enjeux de genre
Gavray, Claire ULg

in Interrogations , revue pluridisciplinaire en sciences sociales - revue en ligne (2009), 8

Juvenile Delinquency and Gender Issues Based on a recent survey on self-related delinquency conducted in Belgium as part of an International research, girls’ and boys’ behaviours are questioned ... [more ▼]

Juvenile Delinquency and Gender Issues Based on a recent survey on self-related delinquency conducted in Belgium as part of an International research, girls’ and boys’ behaviours are questioned. Comparisons confirm a lower deviant implication from girls but this phenomenon is not uniform according to the type of act taken into account. Beyond that, comparisons question mechanisms that compel boys and girls to experience deviant behaviours or to take risks. The Gender perspective helps to understand results, even paradoxical ones. The usual invisibility of those mechanisms contributes to make believe, wrongly, in a linear, even successfully completed march towards sex equality or in natural gendered specificities [less ▲]

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See detailA new diagnostic tool for in vitro allergy
Gadisseur, Romy ULg; Chapelle, Jean-Paul ULg; Cavalier, Etienne ULg

in Allergy (2009, June), 64

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See detailANALYTICAL PERFORMANCE OF THE C-TERMINAL FGF-23 (IMMUTOPICS)
Cavalier, Etienne ULg; Rozet, Eric ULg; Carlisi, Ignazia ULg et al

in Clinical Chemistry & Laboratory Medicine (2009, June), 47(M-A032),

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See detailOn the use of a truly–mixed formulation in topology optimization with global stress–constraints
Bruggi, Matteo; Duysinx, Pierre ULg

in Proceeding of the 8th World Congress on Structural and Multidisciplinary Optimization (2009, June)

The work refers to the field of topology optimization for bidimensional structures and addresses the case in which global stress–constraints are considered to improve final designs. Most of the previous ... [more ▼]

The work refers to the field of topology optimization for bidimensional structures and addresses the case in which global stress–constraints are considered to improve final designs. Most of the previous research tackles this topic relying on classical displacement–based finite elements where stresses are recovered via post–processing techniques. The work conversely investigates the use of a truly–mixed formulation where stresses are independent variables of the problem while displacements play the secondary role of Lagrangian multiplier. The implemented discretization is based on a composite triangular element whose features may be advantageously exploited in stress–constrained topology optimization. The discretization is checkerboard–free and allows to tackle topology optimization with element–based constraints without introducing any additional filtering technique. The high accuracy in the evaluation of the average stresses is expected to improve the efficiency of the numerical procedure, especially in the case of a single global constraint that has to govern the whole domain. The adopted discretization also passes the robustness condition even in the case of incompressible materials and this allows to menage strength constraints also for rubber–like components. Basing on these ideas, numerical investigations are carried out to test preliminary applications of the truly–mixed technique coupled with topology optimization and global stress–constraints. To handle the well–known singularity problem, that affects the constraints imposition, an alternative scheme is herein adopted instead of a classical "–relaxation. An example where a homogenous stress distribution is expected is firstly tested, having the aim of pointing out the main features of the proposed procedure. Afterwards, numerical simulations address a classical L–shaped specimen, pointing out pros and cons of the approach. [less ▲]

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See detailDC and AC Shielding Properties of Bulk High-Tc Superconducting Tubes
Fagnard, Jean-François ULg; Denis, Samuel; Lousberg, Grégory ULg et al

in IEEE Transactions on Applied Superconductivity (2009), 19(3), 2905-2908

We have studied numerically and experimentally the magnetic flux penetration in high-Tc superconducting tube subjected to a uniform magnetic field parallel to its long axis. This study is carried in view ... [more ▼]

We have studied numerically and experimentally the magnetic flux penetration in high-Tc superconducting tube subjected to a uniform magnetic field parallel to its long axis. This study is carried in view of designing low-frequency magnetic shields by exploiting the diamagnetic properties of high-Tc superconducting ceramics. We have measured the field attenuation for applied magnetic fields in the frequency range 5 mHz-0.1 Hz by Hall probe measurements and at audio frequencies using a sensing coil. A simple 1D analysis using the Kim critical state model was found to be able to reproduce the experimental data satisfactorily. We have also determined the phase shift between the internal and the applied field both experimentally and numerically. Finally, we have studied the sweep rate dependence of the magnetic shielding properties, using data recorded either at several constant sweep rates dB/dt or at several AC fields of various amplitudes and frequencies. Both methods agree with each other and lead to a n -value of the E ~ J n law equal to ~ 40 at 77 K. [less ▲]

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See detailWho's Counting Dead Wood ?
Woodall, C. W.; Verkerk, H.; Rondeux, Jacques ULg et al

in EFI News (2009), 17(2), 12-13

Dead wood in forests is a critical component of biodiversity, carbon and nutrient cycles, stand structure, and fuel loadings. Until recently, very few countries have conducted systematic inventories of ... [more ▼]

Dead wood in forests is a critical component of biodiversity, carbon and nutrient cycles, stand structure, and fuel loadings. Until recently, very few countries have conducted systematic inventories of dead wood resources across their forest lands. This may be changing as an increasing number of countries implement dead wood inventories. A recent survey looks at the status and attributes of forest dead wood inventories in over 60 countries. About 13 percent of countries inventory dead wood globally and most of these countries have initiated large-scale inventories of forest dead wood only recently (< 10 years). Given the growing importance of forest dead wood resources to many countries, globally harmonizing dead wood inventories helps everyone reach a common language in an era of climate change. [less ▲]

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See detailAménagement de la voie navigable "Seine-Escaut Est" : Conception et calcul des portes aval des écluses de Marchienne-au-Pont, Gosselies, Viesville et Obourg
Gernay, Thomas ULg

Master's dissertation (2009)

This paper presents a research study performed lock gates. It concerns the downstream lock gates of the one of the four new locks planned within the framework of the “Seine-Escaut Est (SEE)” project in ... [more ▼]

This paper presents a research study performed lock gates. It concerns the downstream lock gates of the one of the four new locks planned within the framework of the “Seine-Escaut Est (SEE)” project in the Walloon Region of Belgium. At the stage of the basic preliminary design, it was decided to use four identical gates, all suspended and manoeuvred by lateral movement. On this basis, the present work tackles with different aspects of the lock gate study. The aim is double: on one hand, to advance in the study of the solution of the four downstream lock gates of the SEE project, and the other hand, to concentrate more particularly on the lock gate analysis, among which their design, optimization and structural behavior in the case of ship impact. We began with the design and optimization of the gate. This work was realized with the LBR5 lock gate optimization software, according to a method comparing a representative number of optimized solutions considering at the same time the cost and weight aspects of the structure. This method leaded to an optimized solution of the downstream gate on which further studies are concentrated. Indeed this optimized gate was modeled with the non linear finite elements software FINELG. This program was used to conduct a non linear numerical analysis of the effect of a boat impact on the downstream gate. Several analyses were performed that allowed us to discuss on the influence of the stiffener dimensions and the influence of the impact zone on the gate structural behavior submitted to the impact. Two different behaviors have been brought to light, a ductile one and a fragile one. The results of the numerical analysis with finite elements have underlined the importance of the development of a global plastic mechanism with the purpose of dissipating a large amount of energy. Finally, we have used an analytical model to calculate the gate theoretical strength in a case of a ship impact, and to compare this value with the FEM numerical analysis results. [less ▲]

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See detailAfterload mismatch revealed by an exercise biphasic response in aortic stenosis
Lancellotti, Patrizio ULg; Moonen, Marie ULg; Garweg, Christophe ULg et al

in Archives of Cardiovascular Diseases (2009), 102(6-7), 593-594

Detailed reference viewed: 58 (11 ULg)