Publications ORBi OA
Bookmark and Share    
Full Text
Peer Reviewed
See detailLa cooperación: ¿un instrumento de soft power?
Parra Santamaria, Lusmiriam Andrea ULg; Leylavergne, Jacques

in El Ágora USB (2009), 9(1), 183-209

The concept of the existence of the Soft Power, developed by Joseph Nye, and which is based upon the resources that deepen the power of a State, may be identified today with other actors of the ... [more ▼]

The concept of the existence of the Soft Power, developed by Joseph Nye, and which is based upon the resources that deepen the power of a State, may be identified today with other actors of the international scenario and the international organizations. The dynamics of the international cooperation, within these organizations, seem to accompany the existence of this type of power. And it is in this way that the phenomenon of the Francophonie has turned out to be a breeding ground for the study of a model of Soft Power which is exerted in the institutional level within organizations like the International Organization of la Francophonie – OIF – and in relation to the United Nations Organizations – UNO – and its operators like UNESCO, and in the bilateral level between States, for example, in the relationship of bilateral cooperation between France and Colombia. In order to verify such a statement, this research shows both a quantitative and qualitative reading of the actions which make evident the existence of such a type of power which turns out to be essential. [less ▲]

Detailed reference viewed: 103 (2 ULg)
Full Text
See detailLa maladie de Mortellaro: un fléau insidieux dans les élevages bovins
Guyot, Hugues ULg

Article for general public (2009)

Detailed reference viewed: 388 (37 ULg)
Full Text
Peer Reviewed
See detailPatenting activity in manufacturing organoclays for nanocomposite applications
Naveau, Elodie ULg; Detrembleur, Christophe ULg; Jérôme, Christine ULg et al

in Recent Patents on Materials Science (2009), 2(1), 43-49

For the last two decades, intensive research has been focused on developing reinforced polymers with incorporation of nanometric fillers. Amongst the different types of nanofillers, those based on layered ... [more ▼]

For the last two decades, intensive research has been focused on developing reinforced polymers with incorporation of nanometric fillers. Amongst the different types of nanofillers, those based on layered silicates (commonly known as clays), have been most widely investigated. Dispersing clay sheets on a nanoscopic scale (so-called exfoliation) indeed allows materials with enhanced thermal, mechanical, rheological, flame retardancy and barrier properties to be produced. However, the nanocomposite performances are strongly dependent upon the extent of clay exfoliation. In order to enhance the compatibility between the pristine clay, hydrophilic, and the polymer, hydrophobic, and to achieve a good delamination of the nanolayers, an organo-modification of the clay is most usually necessary. This mini-review will provide an outline of patenting activity in the field of manufacturing organoclays through ionic exchange. The variety of organic modifiers and the diverse processing techniques will be detailed, aiming to extract the most relevant organoclays for successful nanocomposite formation at industrial scale. [less ▲]

Detailed reference viewed: 90 (6 ULg)
Full Text
Peer Reviewed
See detailLa place des spasmolytiques dans la colique néphrétique
Duquenne, Sébastien ULg; Hellel, Majed; Godinas, Laurent ULg et al

in Revue Médicale de Liège (2009), 64(1), 43-46

Les différents spasmolytiques sont souvent prescrits par les médecins généralistes ou dans les services d’urgence dès que le diagnostic de colique néphrétique est posé. Une pratique cependant contestée ... [more ▼]

Les différents spasmolytiques sont souvent prescrits par les médecins généralistes ou dans les services d’urgence dès que le diagnostic de colique néphrétique est posé. Une pratique cependant contestée. Cet article a pour but de faire une revue de la littérature de l’efficacité des spasmolytiques dans la colique néphrétique, et d’opposer celle-ci à la pratique quotidienne, ainsi que de faire le point sur les effets secondaires. Conclusion : la revue de l’EBM sur le sujet ne permet pas de prouver l’efficacité des spasmolytiques, et montre qu’il est préférable d’utiliser le diclofenac en monothérapie et de traiter les patients non contrôlés par tramadol et antalgiques. Il faudra adjoindre du tamsulosine pour les calculs du bas uretère. [less ▲]

Detailed reference viewed: 73 (1 ULg)
Full Text
See detailGCxGC-TOFMS for metabolomic profiling
Focant, Jean-François ULg; De Pauw, Edwin ULg

Conference (2009, January)

Detailed reference viewed: 20 (2 ULg)
Full Text
See detailConsidération sur la désignation et le détourage en chênes et en hêtre
Perin, Jérôme ULg; Claessens, Hugues ULg

in Forêt Wallonne (2009), (98), 39-52

Nombreuses sont les questions relatives à la technique des arbres-objectif. À partir de l’analyse des dispositifs de détourage mis en place en 2002 par l’asbl Forêt Wallonne, l’UCL et la FUSAGx, l’article ... [more ▼]

Nombreuses sont les questions relatives à la technique des arbres-objectif. À partir de l’analyse des dispositifs de détourage mis en place en 2002 par l’asbl Forêt Wallonne, l’UCL et la FUSAGx, l’article s’attache à répondre à l’une d’entre elles : quel est l’impact de l’intensité de détourage sur la croissance et la qualité des arbres-objectif et, notamment, sur le développement des gourmands ? Quelques tendances assez nettes se dégagent déjà après 3 ans. Sur une si courte période, celles-ci doivent toutefois être interprétées avec prudence. [less ▲]

Detailed reference viewed: 114 (19 ULg)
Full Text
See detailSplit rank of triange and quadrilateral inequalities
Louveaux, Quentin ULg

Conference (2009, January)

A simple relaxation consisting of two rows of a simplex tableau is a mixed-integer set with two equations, two free integer variables, and nonnegative continuous variables. Recently, Andersen et al. and ... [more ▼]

A simple relaxation consisting of two rows of a simplex tableau is a mixed-integer set with two equations, two free integer variables, and nonnegative continuous variables. Recently, Andersen et al. and Cornuéjols and Margot showed that the facet- defining inequalities of this set are either split cuts or intersection cuts obtained from lattice-free triangles and quadrilaterals. From an example given by Cook, Kannan and Schrijver it is known that one particular class of facet-defining triangle inequality does not have finite split rank. In this talk we show that all other facet-defining triangle and quadrilateral inequalities have finite split rank. [less ▲]

Detailed reference viewed: 20 (0 ULg)
Full Text
See detailMéthodes de gestion des principales plantes invasives en zones humides - 2 ème partie
Pieret, Nora; Delbart, Emmanuel ULg; Vanderhoeven, SONIA ULg et al

in Silva Belgica (2009)

Detailed reference viewed: 45 (8 ULg)
Full Text
Peer Reviewed
See detailRecent threats on coastal ecosystems by new pollutants: a multiple trace element study
Richir, Jonathan ULg; Gobert, Sylvie ULg; Bouquegneau, Jean-Marie ULg

Poster (2009, January)

The Mediterranean Sea is an enclosed basin, highly submitted to anthropogenic pressures. Chemical pollution from coastal urban centres and industries, or carried by air and rivers, primarily affects its ... [more ▼]

The Mediterranean Sea is an enclosed basin, highly submitted to anthropogenic pressures. Chemical pollution from coastal urban centres and industries, or carried by air and rivers, primarily affects its coastal ecosystems. Pollution by trace elements is rapidly evolving further to the recent modifications of their production and industrial uses by men. As a result, certain trace elements can now be considered as new environmental pollutants. Appropriate bioindicators are useful tools for the early warning of marine pollution. We presently investigate the use of the purple sea urchin Paracentrotus lividus and the marine phanerogam Posidonia oceanica as bioindicators to monitor the Mediterranean coastal pollution by new trace pollutants (Be, V, Mo, Mn, PGEs, Ag, Al, As, Se, Sb and Bi). Classic trace metals (Cd, Cr, Cu, Zn, Ni, Sn, Pb, Co and Fe) are also studied. Organisms were seasonally collected in 2008 in a reference site and a polluted one, respectively Calvi bay (Corsica) and Marseille (France). Their tissular trace element concentrations were determined by ICP-MS. All the investigated trace elements were chosen for their potential toxic effects. [less ▲]

Detailed reference viewed: 126 (24 ULg)
Full Text
Peer Reviewed
See detailIl tempo per leggere : Una goccia di splendore di Fabio Pusterla
Curreri, Luciano ULg

in Chichibìo (2009), 51/52

Detailed reference viewed: 15 (3 ULg)
Full Text
Peer Reviewed
See detailAgreement between an isolated rater and a group of raters
Vanbelle, Sophie ULg; Albert, Adelin ULg

in Statistica Neerlandica (2009), 63(1), 82-100

The agreement between two raters judging items on a categorical scale is traditionally assessed by Cohen’s kappa coefficient. We introduce a new coefficient for quantifying the degree of agreement between ... [more ▼]

The agreement between two raters judging items on a categorical scale is traditionally assessed by Cohen’s kappa coefficient. We introduce a new coefficient for quantifying the degree of agreement between an isolated rater and a group of raters on a nominal or ordinal scale. The group of raters is regarded as a whole, a reference or gold-standard group with its own heterogeneity. The coefficient, defined on a population-based model, requires a specific definition of the concept of perfect agreement. It has the same properties as Cohen’s kappa coefficient and reduces to the latter when there is only one rater in the group. The new approach overcomes the problem of consensus within the group of raters and generalizes Schouten’s index. The method is illustrated on published syphilis data and on data collected from a study assessing the ability of medical students in diagnostic reasoning when compared with expert knowledge. [less ▲]

Detailed reference viewed: 73 (11 ULg)
Full Text
Peer Reviewed
See detailFormalisation et partage d'une praxis docimologique dans l'enseignement supérieur : l'apport de l'enquête internationale PraDES
Gilles, Jean-Luc ULg; Detroz, Pascal ULg

in Paquay, Léopold (Ed.) Evaluation et développement professionnel - Résumés (2009, January)

Detailed reference viewed: 63 (12 ULg)
Full Text
Peer Reviewed
See detailComparaison des stratégies d’enseignement du basket-ball en milieu scolaire et en milieu sportif
Frédéric, Olivier ULg; Gribomont, Jérôme; Cloes, Marc ULg

in e Journal de la Recherche sur l'Intervention en Education Physique et Sport (2009), 16

Since many years, teamsports' teaching receives a special interest from researchers involved in the Sport Pedagogy domain. In parallel to the traditional approach focusing on sport skills teaching, other ... [more ▼]

Since many years, teamsports' teaching receives a special interest from researchers involved in the Sport Pedagogy domain. In parallel to the traditional approach focusing on sport skills teaching, other pedagogical processes more focused on learner and play are recommended today. If few data are available about how these sports are taught in school and sports contexts of the French speaking part of Belgium (Wallonia), we hypothesized that teamsports' teaching remains analytical whatever the context. To verify this hypothesis, we have video recorded basketball session proposed by physical education teachers/coaches. Using stimulated recall interviews, we compared the teaching strategies of both groups of subjects. Differences were observed in organisation as well as in didactic processes. However, similarities were identified in teaching content and interventions characteristics. [less ▲]

Detailed reference viewed: 904 (29 ULg)
Full Text
Peer Reviewed
See detailLa vitamine D : effets « classiques », « non classiques » et évaluation du statut du patient
Cavalier, Etienne ULg; Souberbielle, Jean-Claude

in Médecine Nucléaire : Imagerie Fonctionnelle et Métabolique (2009), 33

Detailed reference viewed: 74 (8 ULg)
Full Text
Peer Reviewed
See detailEvidence for wastewater influence in a low impacted area throughout stable isotope analyses of the limpet Patella caerulea and epilithic biofilms
Vermeulen, Simon ULg; Lepoint, Gilles ULg; Gobert, Sylvie ULg

Poster (2009, January)

Eutrophication is considered to be one of the main threats to marine environments leading to changes in trophic status of ecosystems and alteration of biological diversity. Carbon and Nitrogen stable ... [more ▼]

Eutrophication is considered to be one of the main threats to marine environments leading to changes in trophic status of ecosystems and alteration of biological diversity. Carbon and Nitrogen stable isotopes analyses were performed on the limpet Patella caerulea and one of its food sources (epilithic biofilms) to assess their potential as early indicators of eutrophication. Samples were seasonally collected in 2005-2006 on five locations gradually exposed to urban sewage in the Calvi Bay and in the Marseilles harbour. Stable isotope signatures of Patella caerulea muscles exhibited steady site - specific values over seasons. In contrast to this time – integrated signal, wide variations in biofilm values show that either composition or isotopic ratios of food sources may vary greatly in time and space. Elevated δ15N values of limpets and biofilms, typical of wastewater influence but unrelated to nitrogen loads, indicate the biological availability of sewage-derived nitrogen in the Calvi Bay and the Marseilles harbour. A reference level of δ15N values is rapidly reached with increasing depth that indicates the limited vertical extent of pollution in the Calvi Bay. [less ▲]

Detailed reference viewed: 122 (29 ULg)
Full Text
See detailFish farm impacts on Posidonia oceanica meadows: interest of the microbenthic loop.
Pete, Dorothée ULg; Velimirov, Branko; Bouquegneau, Jean-Marie ULg et al

Poster (2009, January)

Posidonia oceanica, the seagrass endemic to the Mediterranean Sea, is a valuable tool to assess the environmental quality in coastal zones. However, only few studies have attempted to use characteristics ... [more ▼]

Posidonia oceanica, the seagrass endemic to the Mediterranean Sea, is a valuable tool to assess the environmental quality in coastal zones. However, only few studies have attempted to use characteristics of its sediment compartment as an indicator of environmental perturbations. In this study, the impact of a fish farm on the microbenthic loop (organic matter, bacteria, microphytobenthos and meiofauna) of P. oceanica meadows will be described. Samples were taken under an aquaculture situated in Calvi Bay (Corsica, France) at a depth of 22 m, in March and June 2008. The control site was the meadow situated in front of the research station STARESO (Calvi Bay, Corsica, France), sampled at the same periods and depth. Results concerning bacteria, microphytobenthos and organic matter will be presented here. For both seasons, differences between sites exist. For example, biomasses of organic matter, microphytobenthos and bacteria are higher in the fish farm than in the control site, indicating that the microbenthic loop has potential to be a good early indicator of pollution in this sea. [less ▲]

Detailed reference viewed: 104 (25 ULg)
Full Text
Peer Reviewed
See detailAnalyse des structures valorisant le rôle social du sport en Communauté Wallonie-Bruxelles
Vandermeulen, Mary ULg; Cloes, Marc ULg

in e Journal de la Recherche sur l'Intervention en Education Physique et Sport (2009), 16

En Belgique, la Fondation Roi Baudouin (FRB) est une référence en matière de développement du bien-être des citoyens. Dans la perspective de générer des informations utiles à la conception de son prochain ... [more ▼]

En Belgique, la Fondation Roi Baudouin (FRB) est une référence en matière de développement du bien-être des citoyens. Dans la perspective de générer des informations utiles à la conception de son prochain plan quinquennal, le Service Intervention et Gestion en Activités Physiques et Sportives (SIGAPS) de l’Université de Liège a été chargé de réaliser une étude prospective visant à identifier des pistes d’interventions originales susceptibles de rencontrer les besoins actuels des acteurs de terrain en « sport social ». La première étape de cette étude a porté sur l’établissement d’un état des lieux non exhaustif des initiatives utilisant le sport/l’activité physique comme outil social. Sur base des informations fournies par les acteurs de terrain, nous avons identifié les raisons justifiant le développement limité de ces dernières et les moyens qui devraient être mis en œuvre pour remédier à cette situation. Dans une deuxième étape, un groupe de praticiens s’est réuni en vue de faire émerger les pistes d’actions dans lesquelles la FRB pourrait s’investir afin de rencontrer les attentes réelles des spécialistes. Des propositions concrètes ont ainsi pu être formulées. Elles peuvent être considérées comme une source d’inspiration voire des recommandations. [less ▲]

Detailed reference viewed: 232 (35 ULg)
Full Text
See detailGeometry and Symmetries in Coordination Control
Sarlette, Alain ULg

Doctoral thesis (2009)

The present dissertation studies specific issues related to the coordination of a set of “agents” evolving on a nonlinear manifold, more particularly a homogeneous manifold or a Lie group. The viewpoint is ... [more ▼]

The present dissertation studies specific issues related to the coordination of a set of “agents” evolving on a nonlinear manifold, more particularly a homogeneous manifold or a Lie group. The viewpoint is somewhere between control algorithm design and system analysis, as algorithms are derived from simple principles — often retrieving existing models — to highlight specific behaviors. With a fair amount of approximation, the objective of the dissertation can be summarized by the following question: Given a swarm of identical agents evolving on a nonlinear, nonconvex configuration space with high symmetry, how can you define specific collective behavior, and how can you design individual agent control laws to get a collective behavior, without introducing hierarchy nor external reference points that would break the symmetry of the configuration space? Maintaining the basic symmetries of the coordination problem lies at the heart of the contributions. The main focus is on the global geometric invariance of the configuration space. This contrasts with most existing work on coordination, where either the agents evolve on vector spaces — which, to some extent, can cover local behavior on manifolds — or coordination is coupled to external reference tracking such that the reference can serve as a beacon around which the geometry is distorted towards vector space-like properties. A second, more standard symmetry is to treat all agents identically. Another basic ingredient of the coordination problem that has important implications in this dissertation is the reduced agent interconnectivity: each agent only gets information from a limited set of other agents, which can be varying. In order to focus on issues related to geometry / symmetry and reduced interconnectivity, individual agent dynamics are drastically simplified to simple integrators. This is justified at a “planning” level. Making the step towards realistic dynamics is illustrated for the specific case of rigid body attitude synchronization. The main contributions of this dissertation are I. an extensive study of synchronization on the circle, (a) highlighting difficulties encountered for coordination and (b) proposing simple strategies to overcome these difficulties; II. (a) a geometric definition and related control law for “consensus” configurations on compact homogeneous manifolds, of which synchronization — all agents at the same point — is a special case, and (b) control laws to (almost) globally reach synchronization and “balancing”, its opposite, under general interconnectivity conditions; III. several propositions for rigid body attitude synchronization under mechanical dynamics; IV. a geometric framework for “coordinated motion” on Lie groups, (a) giving a geometric definition of coordinated motion and investigating its implications, and (b) providing systematic methods to design control laws for coordinated motion. Examples treated for illustration of the theoretical concepts are the circle S^1 (sometimes the sphere S^n ), the rotation group SO(n), the rigid-body motion groups SE(2) and SE(3) and the Grassmann manifolds Grass(p,n). The developments in this dissertation remain at a rather theoretical level; potential applications are briefly discussed. [less ▲]

Detailed reference viewed: 315 (24 ULg)