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See detailRIO en France
Pirenne, Christophe ULg

Conference (2009, February 02)

Detailed reference viewed: 9 (2 ULg)
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See detailThe Beta Cephei star HD 180642: Full integration of CoRoT and ground data for mode identification
Briquet, Maryline ULg

Conference (2009, February)

The B1.5 II-III star HD 180642 is the only known Beta Cephei star in CoRoT’s core programme. To complement the space data of this target, both ground-based photometric and spectroscopic data were ... [more ▼]

The B1.5 II-III star HD 180642 is the only known Beta Cephei star in CoRoT’s core programme. To complement the space data of this target, both ground-based photometric and spectroscopic data were collected, to which we added several archival observations. In this talk, we describe our results from a full integration of CoRoT and intensive ground-based observations. The star is a non-linear dominant radial mode pulsator for which low-amplitude modes are detected for the fi rst time. A few of the latter are observed in our ground-based datasets so that a mode identifi cation for them is possible. To this end state-of-the-art techniques are adapted to be applied to a star with a highly non-linear behaviour of the radial mode. Additionally, a careful interpretation of the CoRoT lightcurve helps to identify the wavenumbers. Besides this outcome, the Van Hoof effect for the dominant mode is investigated and the stellar parameters and chemical abundances are determined. All this information is to be used as additional constraints to the CoRoT pulsation frequencies, for asteroseismic modelling of this Beta Cephei star. Additional abstracts cover the lightcurve modelling of this pulsator (Degroote et al.) as well as seismic modelling (Thoul et al.). [less ▲]

Detailed reference viewed: 9 (2 ULg)
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See detailActualités en fiscalité européenne
Richelle, Isabelle ULg

Conference (2009, February)

Detailed reference viewed: 23 (7 ULg)
See detailAssessing the World Ocean ventilation timescales with simple analogs - the leaky funnel model
Mouchet, Anne ULg; Deleersnijder, Eric

Conference (2009, February)

Detailed reference viewed: 6 (0 ULg)
Peer Reviewed
See detailThe adaptive efficiency of planning systems: an international comparison
Halleux, Jean-Marie ULg; Marcinzak, S.; van der Krabben

Conference (2009, February)

Detailed reference viewed: 17 (1 ULg)
See detailGestion du contrôle de qualité interne
Denooz, Raphael ULg; Pirson, Laurence ULg

Conference (2009, February)

Detailed reference viewed: 24 (4 ULg)
See detailNew data on the palaeobiogeography of Toarcian (Lower Jurassic) ichthyosaurs
Fischer, Valentin ULg; Guiomar, Myette; Godefroit, Pascal

Conference (2009, February)

The Vocontian Basin of SE France was formed along the northwestern border of Tethys during Mesozoic times. Mainly known for its rich ammonite fauna, this basin has also yielded Jurassic and Cretaceous ... [more ▼]

The Vocontian Basin of SE France was formed along the northwestern border of Tethys during Mesozoic times. Mainly known for its rich ammonite fauna, this basin has also yielded Jurassic and Cretaceous ichthyosaur fossils. The specimens discussed here were discovered in lower Toarcian limestone and marl successions in the vicinity of Digne-les-Bains, High-Provence Alps. One of best-preserved specimens is identified as Suevoleviathan sp., a relatively rare genus previously reported only in the German basins. The specimen is fairly complete but crushed and embedded in limestone from the Falciferum ammonite zone. Because the skull is too damaged to see bone sutures, assignation to this genus is mostly based on fin and coracoid morphology. Along with this specimen, a premaxilla and paddle elements of Eurhinosaurus longirostris and possible Stenopterygiidae centra were found in nearby black marls of the Exaratum ammonite subzone (Falciferum zone, Lower Toarcian; see Floquet et al., 2003 for a detailed stratigraphy). These soft marls were deposited in anoxic waters and are coeval with the Posidonia shales of southwest Germany, the Jet rock formation of northeast England and Grandcourt shales of Luxembourg, which allows faunal comparisons between these basins. The localities from the Vocontian Basin are closer to the Tethys than other sites where Toarcian identifiable ichthyosaurs have been found in Europe. Nevertheless all identifiable specimens from the Vocontian Basin are also identified in other basins across Europe. It suggests that Toarcian ichthyosaurs had wide palaeogeographical distributions and were highly mobile swimmers, perfectly adapted to open marine environments. [less ▲]

Detailed reference viewed: 138 (14 ULg)
See detailIron production in the region of Liège in the Middle Age: Contribution of slag inclusions analyses
Mertens, Anne ULg; Mathis, François ULg; DILLMANN, Philiippe et al

Conference (2009, February)

Detailed reference viewed: 36 (7 ULg)
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See detailMicroarrays for allergy
Gadisseur, Romy ULg; Cavalier, Etienne ULg

Conference (2009, January 30)

Detailed reference viewed: 27 (0 ULg)
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See detailCastors, ouvriers et conscrits. Politique d'Illuminations
Saint-Amand, Denis ULg

Conference (2009, January 30)

Detailed reference viewed: 3 (1 ULg)
See detailApplication of Metabolomic Approaches to the Age-related Macular Degeneration (AMD)
De Tullio, Pascal ULg

Conference (2009, January 30)

Detailed reference viewed: 18 (1 ULg)
Peer Reviewed
See detailLa commercialisation d’un ouvrage
Kohl, Benoît ULg

Conference (2009, January 29)

Detailed reference viewed: 2 (0 ULg)
See detailMétabolomique - Identification de métabolites (biomarqueurs) par RMN 2D et LC-NMR
Frederich, Michel ULg

Conference (2009, January 28)

Detailed reference viewed: 40 (8 ULg)
See detailPepLook Scale-Up: Prediction of protein structures
Crowet, Jean-Marc ULg; Brasseur, Robert ULg; Lins, Laurence ULg

Conference (2009, January 27)

Detailed reference viewed: 12 (2 ULg)
Peer Reviewed
See detailInternational Foundation for Research in Paraplegia
Martin, Didier ULg

Conference (2009, January 27)

Detailed reference viewed: 3 (0 ULg)
Peer Reviewed
See detailBeyond the doors of perception
Laroi, Frank ULg; Raballo, Andrea

Conference (2009, January 26)

Detailed reference viewed: 3 (0 ULg)
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Peer Reviewed
See detailA Distributed Lattice Boltzmann-based Flow Simulator
Dethier, Gérard ULg

Conference (2009, January 22)

The use of Lattice Boltzmann (LB) methods is interesting to describe flows through complex geometries encountered in Chemical Engineering (porous media, packed beds, multi phase flows). However, flow ... [more ▼]

The use of Lattice Boltzmann (LB) methods is interesting to describe flows through complex geometries encountered in Chemical Engineering (porous media, packed beds, multi phase flows). However, flow simulations based on LB methods can require big amounts of memory. It is not always possible to run a simulation on a single machine. Distributed computing is a solution to this problem and also accelerates the execution of the flow simulation. In the context of dynamic heterogeneous clusters, the available machines can have different computational powers. The computational power of each machine can vary during a flow simulation (because of background load). Also, the number of available machines can change. These characteristics impose the use of special technics. Dynamic Load Balancing allows the optimal use of available machines. A fault occurs when one or several machines interrupt the execution of the distributed software component they were executing. Checkpointing makes the system fault tolerant. In order to obtain a scalable software and to suppress single points of failure, a special effort is made to decentralize as much as possible the software components of the simulator. Currently, fluid flows of 400³ points (more than 9 GBytes of data) are simulated using an heterogeneous cluster of 54 machines. [less ▲]

Detailed reference viewed: 134 (28 ULg)
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See detailThe EU Dual-Use Export Control Regime: End-Use and End User Provisions
Michel, Quentin ULg

Conference (2009, January 21)

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See detailL’appropriation par des futurs formateurs d’enseignants d’une démarche d’accompagnement réflexif : Analyse critique des critères d’évaluation.
Beckers, Jacqueline ULg; Van der Linden, Sylvie ULg

Conference (2009, January 21)

Cette communication portera sur une approche évaluative du développement professionnel de futurs formateurs d’enseignants (FF). Dans le cadre d’un module de formation du master en Sciences de l’Education ... [more ▼]

Cette communication portera sur une approche évaluative du développement professionnel de futurs formateurs d’enseignants (FF). Dans le cadre d’un module de formation du master en Sciences de l’Education de l’université de Liège (ULg – Belgique), ceux-ci sont préparés à accompagner professionnellement de futurs enseignants (FE) selon une démarche de « supervision réflexive » (Beckers, 2007) inspirée des travaux de Schön (1983) et de Vermersch (1994, 2004) et complétée par l’apport de la didactique professionnelle (Pastré 2005, 2008 ). Il s’agit à la fois de maximiser les occasions pour le FE de prendre conscience de son modèle opératif en situation professionnelle et d’augmenter l’adéquation de son action par meilleure appréhension de la structure conceptuelle de ces situations en regard des buts prioritaires du métier. Cette compétence est à la fois travaillée à l’ULg (en séances collectives, individuelles et en petits groupes) et sur le terrain où les FF accompagnent les FE en stage (cette année, en classes préscolaires). Le travail théorique et pratique de la démarche de supervision réflexive avec les futurs formateurs a débouché sur la clarification de critères de qualité de l’accompagnement visé. Ceux-ci sont appliqués par les formateurs ULg aux données brutes de l’ accompagnement mené par chaque FF (traces retranscrites des entretiens de régulation et rédaction du carnet de bord). Ils sont également utilisés en auto-évaluation par les FF à propos de leur accompagnement. Cette double démarche d’évaluation (hétéro-évaluation et auto-évaluation) alimente une partie de la séance de « confrontation herméneutique » qui réunit chaque FF et les deux formateurs ULg après lecture par ceux-ci de tous les documents (données brutes et rapports). Cette partie du travail permet d’approcher le degré d’appropriation de la compétence d’accompagnement par le FF (genèse instrumentale et conceptuelle – Pastré, 2005). Chaque FF produit également un rapport qui porte sur l’analyse de l’accompagnement qu’il a mené, en interaction avec les caractéristiques contextuelles, et sur l’évolution qu’il a pu observer chez son compagnon FE du point du développement de ses compétences professionnelles et de sa construction identitaire. La discussion de ces analyses alimente la deuxième partie de la « confrontation herméneutique » ; elle permet d’approcher davantage une éventuelle genèse identitaire (Pastré, 2005). L’analyse critique de ces multiples sources d’information et la triangulation des données alimentera la réflexion sur la pertinence des outils et des démarches d’évaluation de ces processus complexes que sont le développement des compétences et de l’identité professionnelles. [less ▲]

Detailed reference viewed: 175 (10 ULg)
See detailNanostructured carbons as supports for catalysts and electrocatalysts
Job, Nathalie ULg

Conference (2009, January 20)

Detailed reference viewed: 6 (0 ULg)
See detailOur present understanding of Lake Kivu ecology
Darchambeau, François ULg; Sarmento, Hugo; Isumbisho, Mwapu et al

Conference (2009, January 19)

Detailed reference viewed: 3 (2 ULg)
See detailCarbon cycling in the mixolimnion of Lake Kivu : results from the CAKI project
Borges, Alberto ULg; Descy, Jean-Pierre; Delille, Bruno ULg et al

Conference (2009, January 19)

Detailed reference viewed: 9 (0 ULg)
See detailEcological modeling of the upper layers of Lake Kivu: a progress report
Leblanc, Christophe; Darchambeau, François ULg; Descy, Jean-Pierre et al

Conference (2009, January 19)

Detailed reference viewed: 2 (0 ULg)
See detailUsage et contexte chez Heidegger et Wittgenstein
Gauvry, Charlotte ULg

Conference (2009, January 17)

Detailed reference viewed: 9 (0 ULg)
Peer Reviewed
See detailFunctional neuroimaging of semantic and episodic forms of self-knowledge
D'Argembeau, Arnaud ULg

Conference (2009, January 15)

Detailed reference viewed: 15 (1 ULg)
Full Text
See detailNew cycles found in air temperature data and proxy series using the Morlet wavelet method
Nicolay, Samuel ULg; Mabille, Georges ULg; Fettweis, Xavier ULg et al

Conference (2009, January 13)

We use the wavelet transform to detect cycles in air temperature data and proxy series

Detailed reference viewed: 9 (3 ULg)
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See detailGCxGC-TOFMS for metabolomic profiling
Focant, Jean-François ULg; De Pauw, Edwin ULg

Conference (2009, January)

Detailed reference viewed: 8 (1 ULg)
See detailLes Partenariats public-privé dans la jurisprudence de la Cour de Justice
Durviaux, Ann-Lawrence ULg

Conference (2009, January)

Detailed reference viewed: 31 (10 ULg)
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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: 17 (0 ULg)
See detailDeriving Risk Appetite and translating it into a meaningful set of limits
Hübner, Georges ULg; Nord, Andrew; Smith, Brian

Conference (2009, January)

Detailed reference viewed: 53 (11 ULg)
Peer Reviewed
See detailL'identité discursive du physiologiste
Stienon, Valérie ULg

Conference (2009, January)

Detailed reference viewed: 5 (0 ULg)
Peer Reviewed
See detailLa vente de gré à gré
Kohl, Benoît ULg

Conference (2009)

Detailed reference viewed: 5 (0 ULg)
See detailModeratrice
Parra Santamaria, Lusmiriam Andrea ULg

Conference (2009)

This Forum has been organised in order to discuss different approaches for the bilateral Colombia-Venezuela's conflict that had taken place during the gouvernements of Alvaro Uribe and Hugo Chavez ... [more ▼]

This Forum has been organised in order to discuss different approaches for the bilateral Colombia-Venezuela's conflict that had taken place during the gouvernements of Alvaro Uribe and Hugo Chavez. Several secteors of the society participated in it. We had academics (from different universities in the city), the local journal's president, the Chief of research of the Central Bank (local office in Cartagena). [less ▲]

Detailed reference viewed: 11 (1 ULg)
See detailApplication of a 3-D Super Ensemble to ocean forecast
Lenartz, Fabian ULg; Barth, Alexander ULg; Beckers, Jean-Marie ULg et al

Conference (2009)

Super Ensemble (SE) techniques have recently allowed improving the forecast of various important oceanographic parameters, such as the significant wave height, the speed of sound or the surface drift, by ... [more ▼]

Super Ensemble (SE) techniques have recently allowed improving the forecast of various important oceanographic parameters, such as the significant wave height, the speed of sound or the surface drift, by correcting the prediction at a single or multiple locations, where data were available during the whole training period. However, nowadays common observation systems, such as satellite imagery or drifters, do not always provide information at the exact same locations, hence it is necessary to generalize the approach in order to take benefit of every image or track available. In this study, we try and apply a SE, fed with remote sensing and gliders data, to 3-D hydrodynamic models. The basic idea on which rely the SE methods is that a certain combination of several model runs and possibly data could yield better results than just one single model, even if it has a higher temporal or spatial resolution. As the most efficient techniques are the ones using observations, they rapidly developed and increased in complexity by copying what had been done in the data assimilation community; getting from the simple ensemble mean of the model outputs to their linear combination based on a particle filter. In our present study, we have decided to use the Kalman filter (KF) as it alleviates the need of an a priori determination of the training period length, and does not require the run of a very large ensemble of members. In addition, we apply it in a 3-D framework in order to take benefit of the spatial information contained by each source of measurements. For example, satellite images of sea surface temperature (SST) are very useful to correct the value of this parameter, but depending on the structure of the water column, it can also give a precious guess of how warm or cold is the ocean at 20 m deep. In our experiment the domain of interest is the Ligurian Sea during the last week of September, when part of the set-up for the CalVal08 campaign (SiC Charles Trees) had already taken place. The data assimilated during the training of the filter are SST images from AVHRR, as well as temperature and salinity profiles from two Rutgers University gliders. The models used for the study are three nested models of NCOM, run without data assimilation. The two considered variables are the temperature and the salinity. As our method is designed to work in a multivariate way, salinity forecast can possibly be improved by observing temperature profiles. Statistics are computed for both the training and the testing periods with an independent set of data. In four test cases, we review the impact of both the nature of the assimilated data, and the formulation of the model covariance matrix. At the end, we show that, on the basis of previous model outputs from which we’ve drawn an estimate of the model covariance, RMS error of the forecast in the whole 3-D domain can be reduced by 30%, thanks to the only assimilation of satellite SST images. [less ▲]

Detailed reference viewed: 48 (5 ULg)
Peer Reviewed
See detailDetecting preferential flow and transport in soils using electrical resistivity tomography
Vanderborght, Jan; Oberdoerster, Christoph; Garré, Sarah ULg et al

Conference (2009)

Detailed reference viewed: 47 (1 ULg)
See detailImplants dans le secteur esthétique: choix du timing et de la technique chirurgicale.
LAMBERT, France ULg

Conference (2009)

Les résultats esthétiques en implantologie sont déterminés par une harmonie tissulaire et prothétique. Plusieurs techniques chirurgicales sont décrites et le choix de celle-ci est déterminant pour obtenir ... [more ▼]

Les résultats esthétiques en implantologie sont déterminés par une harmonie tissulaire et prothétique. Plusieurs techniques chirurgicales sont décrites et le choix de celle-ci est déterminant pour obtenir un résultat esthétique optimal. Cet exposé décrit des techniques chirurgicales telles que: extraction/implantation immédiate, gestion d'alvéoles ou encore régénération osseuse. L'objectif est, à partir d'une situation clinique initiale, de déterminer le choix de la technique idéale ainsi que le timing chirurgical . [less ▲]

Detailed reference viewed: 16 (0 ULg)
Peer Reviewed
See detailExploring the L1-L2 relationship in the L2 acquisition of prosody
Rasier, Laurent ULg; Hiligsmann, Philippe

Conference (2009)

Detailed reference viewed: 68 (1 ULg)
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Peer Reviewed
See detailConstraint Based Learning of Mixtures of Trees
Schnitzler, François ULg; Wehenkel, Louis ULg

Conference (2009)

Mixtures of trees can be used to model any multivariate distributions. In this work the possibility to learn these models from data by causal learning is explored. The algorithm developed aims at ... [more ▼]

Mixtures of trees can be used to model any multivariate distributions. In this work the possibility to learn these models from data by causal learning is explored. The algorithm developed aims at approximating all first order relationships between pairs of variables by a mixture of a given size. This approach is evaluated based on synthetic data, and seems promising. [less ▲]

Detailed reference viewed: 32 (7 ULg)
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Peer Reviewed
See detailGlance on preliminary nutritional data ORISCAV-LUX Survey
Alkerwi; Guillaume, Michèle ULg

Conference (2009)

Detailed reference viewed: 7 (1 ULg)
See detailAnalyse de bijoux mérovingiens en Belgique
Mathis, François ULg; Othmane, Guillaume; Vrielynck, Olivier

Conference (2009)

Detailed reference viewed: 14 (2 ULg)
See detailDette d'extinction dans un hotspot de biodiversité: approches communauté et espèces
Piqueray, Julien ULg; Bisteau, Emmanuelle; Cristofoli, Sara et al

Conference (2009)

Detailed reference viewed: 76 (6 ULg)
Peer Reviewed
See detailDe meisje heeft de boek niet gelezen, maar wel het krant. Genus in het Nederlands van anderstaligen
Rasier, Laurent ULg; Hiligsmann, Philippe

Conference (2009)

Detailed reference viewed: 8 (0 ULg)
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Peer Reviewed
See detail200mm Si/SiGe Resonant Interband Tunneling Diodes Incorporating δ-Doping Layers Grown by CVD
Park, Si-Young; Anisha, Ramesh; Berger, Paul et al

Conference (2009)

Detailed reference viewed: 15 (1 ULg)
See detailShort Course on Methof Validation
Boulanger, Bruno ULg; Hubert, Philippe ULg

Conference (2009)

Detailed reference viewed: 24 (2 ULg)
Peer Reviewed
See detailThe CORALS project: simulated Cosmic Radiations and Alternative Splicing.
Lambert, Charles ULg; Battout, S.; Van Oostveldt, P. et al

Conference (2009)

Detailed reference viewed: 8 (0 ULg)
Peer Reviewed
See detailSiGe tunnel field effect transistors: challenges for selective epitaxial growth
Loo, Roger; Iacopi, Francesca; Vanherle, Wendy et al

Conference (2009)

Detailed reference viewed: 24 (2 ULg)
Peer Reviewed
See detailContrastieve onderzoeksmodellen onder de loep
Rasier, Laurent ULg; Hiligsmann, Philippe

Conference (2009)

Detailed reference viewed: 27 (1 ULg)
Peer Reviewed
See detailSi$_1-x$Ge$_x$ growth using Si$_3$H$_8$ by low temperature chemical vapor deposition
Takeuchi, Shotaro; Nguyen, Ngoc Duy ULg; Goossens, Jozefien et al

Conference (2009)

Detailed reference viewed: 7 (2 ULg)
See detailIono slab monitoring service
Stankov, Stanimir; Warnant, René ULg; Stegen, Koen

Conference (2009)

Detailed reference viewed: 10 (0 ULg)
See detailOrigin and early evolution of life
Javaux, Emmanuelle ULg

Conference (2009)

Detailed reference viewed: 5 (0 ULg)
Peer Reviewed
See detailFonctions attentionnelles et exécutives dans la dyspraxie développementale
Lejeune, Caroline ULg; Catale, Corinne ULg; Meulemans, Thierry ULg

Conference (2009)

La dyspraxie développementale se manifeste principalement par des difficultés motrices qui interfèrent avec différentes situations de la vie quotidienne (écriture, dessin, habillage, …). Ces troubles du ... [more ▼]

La dyspraxie développementale se manifeste principalement par des difficultés motrices qui interfèrent avec différentes situations de la vie quotidienne (écriture, dessin, habillage, …). Ces troubles du geste, qui touchent environ 6 % des enfants de 5 à 11 ans, entraînent de lourdes conséquences sur les plans familial, scolaire et social. Plusieurs études ont montré qu’un déficit des capacités d’inhibition, de planification et de mémoire de travail était fréquemment observé chez les enfants souffrant de dyspraxie. Toutefois, en raison des nombreux problèmes méthodologiques rencontrés dans ces recherches (et plus particulièrement liés à l’absence de contrôle de la présence ou non du trouble de l’attention avec/sans hyperactivité – TDA/H - chez la population d’enfants dyspraxiques), les relations entre les troubles attentionnels et les troubles moteurs restent encore à l’heure actuelle mal comprises. L’objectif de cette étude vise à dégager, au travers d’une évaluation du fonctionnement attentionnel et exécutif, le profil neuropsychologique d’enfants diagnostiqués dyspraxiques, et ce en contrôlant la présence d’un TDA/H. Nous avons administré à 23 enfants dyspraxiques âgés de 6 à 12 ans et 23 enfants de contrôle (appariés sur base de l’âge, du sexe et du niveau d’études des parents) des tâches attentionnelles (alerte, attention sélective et divisée) de la batterie TEA et des épreuves exécutives (inhibition [Stroop et Go/No Go], flexibilité cognitive [TEA], mémoire de travail [BTT et mise à jour de TEA] et planification [Tour de Londres]). Les analyses de comparaison de moyennes indiquent que les enfants dyspraxiques présentent des performances inférieures à celles des enfants de contrôle pour l’essentiel des tests neuropsychologiques administrés. Toutefois, deux tiers des enfants dyspraxiques de notre échantillon présentent un trouble de l’attention (critères du DSM-IV). L’analyse des résultats au sein du groupe « dyspraxique sans TDA », permet de montrer que les difficultés de planification, d’attention sélective visuelle, d’inhibition motrice, de mémoire à court terme (BTT et mise à jour) sont spécifiques à la dyspraxie et donc indépendant de la présence d’un trouble de l’attention. En conclusion, cette étude préliminaire montre qu’une grande proportion d’enfants qui présentent une dyspraxie souffre également d’un trouble de l’attention. L’analyse du profil des enfants dyspraxiques montre des difficultés qui touchent l’ensemble des fonctions attentionnelles et exécutives. Toutefois, les difficultés d’analyse visuelle, de planification et de mémoire de travail semblent, quant à elles, spécifiques à la dyspraxie développementale. Des études futures réalisées sur un plus grand nombre de participants permettraient de confirmer cette hypothèse. [less ▲]

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See detailThe Didam framework Disaggregated demand and assignment models for combined passengers and freight transport
Barthélemy, Johan; Cornelis, Eric; Jourquin, Bart et al

Conference (2009)

The objective of this paper is to present the methodological developments in the DIDAM (Disaggregated demand and assignment models for combined passengers and freight transport) research project, which ... [more ▼]

The objective of this paper is to present the methodological developments in the DIDAM (Disaggregated demand and assignment models for combined passengers and freight transport) research project, which aims at advancing fundamental research in transportation modelling and analysis, using two complementary methodologies. The first is to develop a joint methodological approach for both freight and passenger transport, and the second is to base this common approach on the use of models that are as disaggregate and realistic as possible. Furthermore, the methods will be designed to cope with the important question of competition for infrastructure. The project is mainly organized around two themes. Each of them covers both freight and passengers aspects, in a manner which promotes collaborative work between the partners of the project. The first theme is concerned with disaggregate demand modelling issues, the second deals with innovative aspects of (joint) traffic assignment. Working at a fully disaggregate level is however not always easy. If such models are already available for passenger demand and traffic, disaggregate tools are still largely missing for freight transport. This is not only true at the operational level, but, more crucially, at the conceptual level. This is why our research program adopts, in this domain, a progressive approach that introduces disaggregation gradually into existing methods and models. This entails research in a full spectrum of issues, ranging from concepts definition (who are the actors, how can they be characterized ...) to validation exercises using available data sources [less ▲]

Detailed reference viewed: 69 (1 ULg)
See detailSurface circulation of the Caribbean Sea and Gulf of Mexico using 13 years of satellite altimetry data
Alvera Azcarate, Aïda ULg; Barth, Alexander ULg; Weisberg, R. H.

Conference (2009)

The surface circulation of the Caribbean Sea and Gulf of Mexico is studied using thirteen years of satellite altimetry data. In the Caribbean Sea, processes at several temporal scales are analyzed: the ... [more ▼]

The surface circulation of the Caribbean Sea and Gulf of Mexico is studied using thirteen years of satellite altimetry data. In the Caribbean Sea, processes at several temporal scales are analyzed: the Caribbean eddies and meanders characteristics, the annual cycle and its variability through time, and the interannual variability, with a cycle of about 4 years affecting the SSH slope across the current and hence the ntensity of the Caribbean Current. Our analyses suggest that this cycle is related to changes in the wind intensity, wind curl and El Niño Southern Oscillation. In the Gulf of Mexico, the variability of the Loop Current is studied. We analyze the timing of anticyclonic eddy detachment from the Loop Current, the relation between the size of these eddies and the period between detachments, and the intrusion of the Loop Current into the Gulf of Mexico. A series of extreme Loop Current intrusions into the Gulf of Mexico, when the current is observed as far as 92°W, are described. The frequency of such events appears to have increased in recent years, with only one event happening from 1992 to 2002 (in 1993) versus three from 2002 to 2006. [less ▲]

Detailed reference viewed: 47 (1 ULg)
Peer Reviewed
See detailMarket area of intermodal rail-road container terminals embedded in a hub-and-spoke network
Limbourg, Sabine ULg

Conference (2009)

This paper presents a methodology able to compare road and rail-road intermodal market areas that takes the network structures, the operation costs and the location of the rail-road terminals into account ... [more ▼]

This paper presents a methodology able to compare road and rail-road intermodal market areas that takes the network structures, the operation costs and the location of the rail-road terminals into account.Aparticular way to model rail-road transport on hub-and-spoke networks is outlined and illustrated on the trans-European networks. The market area of an optimal eight hubs network configuration is presented both for the p-hub median and the p-hub centre problem. This is followed by a discussion about the evolution of the market area according to the number and locations of the implemented hubs. [less ▲]

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See detailReconstruction of missing data in satellite data sets using DINEOF with constraints to reduce spurious high-frequency variations in the temporal EOFs
Alvera Azcarate, Aïda ULg; Barth, Alexander ULg; Sirjacobs, Damien ULg et al

Conference (2009)

DINEOF (Data Interpolating Empirical Orthogonal Functions) is a method to reconstruct missing data in geophysical data sets, such as gaps originated by the presence of clouds in infrared satellite sensors ... [more ▼]

DINEOF (Data Interpolating Empirical Orthogonal Functions) is a method to reconstruct missing data in geophysical data sets, such as gaps originated by the presence of clouds in infrared satellite sensors. Based on Empirical Orthogonal Functions (EOFs), DINEOF uses an iterative procedure to calculate the missing values. DINEOF has been compared to Optimal Interpolation, showing that more accurate results are achieved, with up to 30 times less computational time (tests made with sea surface temperature of the Adriatic Sea, and validated with in situ data). Another advantage of this technology is that there is no need for a priori knowledge of the reconstructed data set statistics (such as covariance or correlation length). The technique can be applied to a broad range of data (physical, biological, chemical), and to a variety of platforms (satellite data, in situ data...). Given the nature of the EOFs, it is not necessary that data sets are regularly distributed in time. Irregularly distributed data sets, however, may lead to discontinuities in the temporal EOFs calculated from them, and these discontinuities can affect in turn the quality of the DINEOF reconstruction. In satellite data, some images can present a large amount of cloud cover, and only a few pixels with valid data. EOF projection to such images can also lead to discontinuities in the temporal modes, as there might be an over-fitting to the scarce information present in those images. After briefly describe DINEOF and its applications, we present a study aiming to reduce these discontinuities by including a time constraint to the covariance matrix used in the EOF decomposition. The approach is tested with sea surface temperature data of the Black Sea, and the results are compared to independent data. [less ▲]

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See detailImpact of Public Market Information System (PMIS) on Farmers Food Marketing Decisions : Case of Benin
Kpènavoun Chogou, Sylvain; Lebailly, Philippe ULg; Adégbidi et al

Conference (2009)

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See detailA One-Field Discontinuous Galerkin Formulation of Non-Linear Kirchhoff-Love Shells
Noels, Ludovic ULg

Conference (2009)

Spatially-discontinuous Galerkin methods constitute a generalization of weak formulations, which allow for discontinuities of the problem unknowns in its domain interior. This is particularly appealing ... [more ▼]

Spatially-discontinuous Galerkin methods constitute a generalization of weak formulations, which allow for discontinuities of the problem unknowns in its domain interior. This is particularly appealing for problems involving high-order derivatives, since discontinuous Galerkin (DG) methods can also be seen as a means of enforcing higher-order continuity requirements. Recently, DG formulations of linear and non-linear Kirchhoff-Love shell theories have been proposed. This new one-field formulations take advantage of the weak enforcement in such a way that the displacements are the only discrete unknowns, while the C1 continuity is enforced weakly. The resulting one field formulation is a simple and efficient method to model thin structures and can be applied to various computational methods. [less ▲]

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See detailDebriefing des accidents d'anesthésie
Nyssen, Anne-Sophie ULg

Conference (2009)

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See detailWerkt een muzikale opleiding de perceptie van prosodische prominentie in een vreemde taal in de hand?
Degrave, Pauline; Hiligsmann, Philippe; Rasier, Laurent ULg

Conference (2009)

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See detailSimplifier les interfaces utilisateurs
Nyssen, Anne-Sophie ULg

Conference (2009)

Detailed reference viewed: 25 (4 ULg)
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See detailEmerging Patterns of Depoliticization and Engagement to Inform the Future of Science and Technology Studies: A Case Study in Nanotechnologies
Thoreau, François ULg

Conference (2009)

In this paper, we address the issue of the future of a particular field of research in social science: Science and Technology Studies (STS). Although this is a very young research field, its history is ... [more ▼]

In this paper, we address the issue of the future of a particular field of research in social science: Science and Technology Studies (STS). Although this is a very young research field, its history is already diverse and its evolutions are fastly moving on. Its rapid expansion and its characteristic feature of crossing disciplinary boundaries are making it an interesting case to study, which takes a particular place in the overall history – and future – of social changes. As we shall indicate, STS have an increasing committment for the resolution of sociotechnical controversies. In this paper, we problematise this particular position by underlying the implicit politics of STS research and how they will shape the future of that particular field. Our approach is threefold. First, we give a brief overview of the history of the field and we point out the main evolutions since the developement of the Social Construction of Technology approach (SCOT) in the 1980s that long influenced the field. By doing so, we underline the epistemological critical tradition that gave the field some of its particularities that we address. We show how this tradition brought important insights of “political” nature within the development of the field. Second, our ambition is to highlight new patterns of evolution of the STS field, emphasizing the trends towards both a greater depoliticisation and a more engaged research. By “depoliticisation”, we intend to analyse the dynamics of institutionalisation of the field which adopts resources and tools to legitimate itself among the social scientific community. By “engaged” research, we will explore the evolutions of the STS field as inherently political. The field does have an implicit statement in favor of changing social order and an increasing willingness to actually influence that social change. In that respect, research projects in STS often have underlying politics, as we shall demonstrate. Third, we give a concrete example of these new patterns occuring, relying on the growing importance of nanotechnologies, both in the STS literature and research projects. We consider this case study to be intertwined with the development of STS as a field of research. In that sense, we stress that nanotechnologies happened to be a powerful tool for legitimation for the STS community. Therefore, we — as STS scholars — suggest instrumentalizing the interest we have in nanotechnologies in order to observe the evolutions of our field of research. Then, nanotechnologies will constitute an interesting ground to perform a test that will show depoliticisation and engagement as patterning the STS field. [less ▲]

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See detailThe beta Cephei star HD180642: Seismic modelling
Thoul, Anne ULg

Conference (2009)

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See detailModelling error of a hydrodynamic model of the Mediterranean Sea
Vandenbulcke, Luc ULg; Rixen, M.; Beckers, Jean-Marie ULg et al

Conference (2009)

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Peer Reviewed
See detailElectrical resistivyt tomography as tool to image preferential flow pathways in soils
Kasteel, Roy; Garré, Sarah ULg; Koestel, Johannes et al

Conference (2009)

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See detailQuel dispositif de formation pour un CDS ? Réflexions à partir de l’expérience de l’Académie Wallonie-Europe
Merenne-Schoumaker, Bernadette ULg; Leduc, Laurent ULg

Conference (2009)

Through analysis and an attempt to assess the system developed at the level of the Wallonia-Europe Academy in the context of Center for Higher Didactics (Centre de Didactique Supérieure : CDS), the ... [more ▼]

Through analysis and an attempt to assess the system developed at the level of the Wallonia-Europe Academy in the context of Center for Higher Didactics (Centre de Didactique Supérieure : CDS), the purpose of this article is to reflect on the specificities and constraints of a training limited to teachers in charge of First Generation students, those specificities being especially constraining since the CDS training sessions take place in a larger context : the training of all the university teachers. The Liege experience enlightens some determinant factors : sensitizing first on the interest of such a training, centring the training on close coaching of students learning with a focus on their difficulties or deficiencies and with help given to teachers in resolving them, meeting the diversity of the situations lived by those teachers (notably in terms of students number and disciplines), taking into account their expectations in accordance with their profile, cleverly combining oral speeches, testimonies and debates, suggesting a diversity of concrete intervention trails… By the way, the joined organization of introduction sessions and close coaching seminars seems to be a relevant formula in order to meet such kind of objectives. [less ▲]

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See detailMacrophyte biological index for rivers (MBIR) application for an ecological assessment of walloon rivers, prelilminary investigations.
Sossey Alaoui, Khadija ULg; Galoux, D.; Rosillon, Françis ULg

Conference (2009)

Samples were collected from 45 sites along the Walloon river network in 2007, in accordance with the Water Framework Directive (WFD, European Union, 2000), used to define the overall ecological status of ... [more ▼]

Samples were collected from 45 sites along the Walloon river network in 2007, in accordance with the Water Framework Directive (WFD, European Union, 2000), used to define the overall ecological status of rivers. Within each collected sample, macrophyte data were gathered at species level and the main water quality parameters were analyzed. This involved the use of two approaches: firstly, methods of ordination and classification (Principal Component Analysis and Multiple Factorial Analysis) and secondly, aquatic macrophyte community indexes. The Macrophyte Biological Index for Rivers (MBIR) was used to define the ecological status of the macrophyte community in response to eutrophication pressure. Four trophic qualities were detected in all the monitored stations: 56% of the sites showed a good trophic quality, with the Ardennes region in the leading position and only 2% of the sites showed a poor trophic quality. A Multiple Factorial Analysis (MFA) made it possible to regroup the species according to their ecological affinities and to specify their indicator values in relation to some abiotic parameters. As a result, a rivers typology was outlined based on this analysis. The dendrogram of the Hierarchical Cluster Analysis (HCA) gave three clusters determined by active variables of each compartment that defined functional parts of the Walloon network: Chiloscyphus polyanthos (L.) Corda, Rhynchostegium riparioides(Hedw.)C.Jens., Fontinalis squamosa(Hedw) and Ranunculus penicillatus (Dum.)Bb. showed an oligotrophic status and low mineralization in the Ardennes (GI), while P. pectinatus(Linne), Cladophora glomerata(Linnaeus)proved to be found more often in eutrophicated waters in the Region limoneuse (GIII). Pellia endvifolia (Dicks.)Dum, Fissidens crassipes(Br.Eur);Cinclidotus riparius (Web. & Mohr.) appeared in the Condroz and Famenne, rivers characterized by a high concentration of nitrogen (N-35. NO3-) (GII). [less ▲]

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See detailImpact of winter feeding strategies on the growth of young dairy heifers in Wallonia
Picron, Pascale ULg; Turlot, Amélie; Froidmont, Eric et al

Conference (2009)

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See detailGlucosinolates and their measurement
Wathelet, Jean-Paul ULg

Conference (2009)

Detailed reference viewed: 16 (4 ULg)
See detailDetection of High molecular mass for MALDI Imaging and Profiling
Franck, Julien; Longuespée, Rémi ULg; Bonnel, David et al

Conference (2009)

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See detailL'agriculture familiale africaine au coeur des Objectifs du Millénaire pour le Développement (OMD)
Berti, Fabio ULg; Lebailly, Philippe ULg

Conference (2009)

L’agriculture familiale africaine est concernée directement par l’Objectif 1 du Millénaire pour le Développement, de réduire de moitié d’ici 2015 l’extrême pauvreté et la faim. En effet, selon la plupart ... [more ▼]

L’agriculture familiale africaine est concernée directement par l’Objectif 1 du Millénaire pour le Développement, de réduire de moitié d’ici 2015 l’extrême pauvreté et la faim. En effet, selon la plupart des observateurs, 70% des pauvres sont localisés dans les zones rurales et sont agriculteurs. Dans ce contexte, il importe de s’interroger sur l’avenir des exploitations agricoles familiales en Afrique. Après avoir présenté la problématique générale de l’exploitation agricole familiale dans le développement, les auteurs présentent une analyse au départ des constats qu’ils ont pu réaliser, respectivement pour les filières de rente de la zone forestière au Cameroun et pour le coton, dans plusieurs pays d’Afrique de l’Ouest. Les analyses sont réalisées à partir des observations effectuées au départ de différentes études financées essentiellement par la Commission européenne au cours de ces dernières années. Il en résulte que le terme « agriculture familiale » recouvre des réalités très différentes avec une différenciation de plus en plus poussée des exploitations agricoles. Dans le même temps, il subsiste de nombreuses exploitations familiales plus « traditionnelles » mêlant des logiques d’autoconsommation et de marché avec des dotations en facteurs plus inégales et donc plus vulnérables. L’enjeu primordial des politiques agricoles qui seront définies sera précisément de prendre en considération la dimension spécifique de ce type d’exploitation, cible prioritaire dans la lutte contre la pauvreté. L’orientation des politiques mises en œuvre autour du seul objectif de la production de biens agricoles ne permettra pas de réduire les disparités internes et souvent croissantes observées. Il convient donc d’intégrer les dimensions sociales et environnementales dans les objectifs des politiques agricoles à mettre en œuvre. [less ▲]

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See detailEtude épidémiologique des comportements alimentaires au service de la promotion de la santé
Lair, ML; Alkerwi, A; Couffignal, S et al

Conference (2009)

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See detailA revised carbon budget for the North Sea
Paetsch, J.; Kuehn, W.; Borges, Alberto ULg et al

Conference (2009)

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