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See detailA test of the Job Demands-Resources model with alternative measures of strain and well-being
Barbier, Marie ULg; Hansez, Isabelle ULg

Conference (2009, May)

Since the beginning of the 21st century, the Job Demands-Resources model (Demerouti, Bakker, Nachreiner & Schaufeli, 2001) has given rise to numerous studies aimed at a better understanding of positive ... [more ▼]

Since the beginning of the 21st century, the Job Demands-Resources model (Demerouti, Bakker, Nachreiner & Schaufeli, 2001) has given rise to numerous studies aimed at a better understanding of positive and negative aspects of wellbeing at work. The existence of a motivational and an energetic process leading to, respectively, engagement and strain has been demonstrated several times, as well as cross-links between the two. However, these studies mainly rely on two measurement tools: the MBI-GS as a measure of strain and the UWES as a measure of engagement. The aim of our study is to test the model using alternative measures. Strain was measured using the NOSI subscale, and engagement using the POSI subscale of the PNOSI, a new tool measuring positive and negative wellbeing. Structural and external validity of this tool have been demonstrated previously (Barbier, Peters & Hansez, submitted). According to the JDR model, we hypothesise that high job demands would lead to strain and then to health problems. Our second hypothesis is that job resources would lead to engagement and then to low intent to leave. Structural equation modelling was performed using Lisrel 8.80 on 954 data collected in a Belgian public institution. As regards to measurement model, results show that a six-factor model (demands, resources, strain, engagement, health problems and intent to quit or IQ) shows good fit to data. We first tested the traditional JDR model, but it showed bad fit. Fit was improved when adding a path from resources to strain, from strain to IQ and from engagement to health problems. This alternative model showed better fit than the initial one. This study makes three main contributions. First, it tests the well-established JDR model using alternative measures of positive and negative sides of well-being. Second, it asks questions as to the respective outcomes of strain and engagement. More specifically, the path between engagement and IQ became not significant when a path from strain to IQ was added. That is, IQ seems to be more a product of strain than of (lack of) engagement. Finally, it emphasizes the important role of resources. It may be that the link between resources and low IQ would be mediated by low level of strain rather than by high level of engagement. Similarly, the relation between engagement and health problem is positive, which raises questions as to the pre-supposed positive effects of engagement. [less ▲]

Detailed reference viewed: 257 (8 ULg)
See detailSense, Nonsense and Context
Gauvry, Charlotte ULg

Conference (2009, May)

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See detailDynamic Hedge Fund Style Analysis with Errors-in-Variables
Bodson, Laurent ULg

Conference (2009, May)

This paper revisits the traditional return-based style analysis (RBSA) in presence of time-varying exposures and errors-in-variables (EIV). We first apply a selection algorithm using the Kalman filter to ... [more ▼]

This paper revisits the traditional return-based style analysis (RBSA) in presence of time-varying exposures and errors-in-variables (EIV). We first apply a selection algorithm using the Kalman filter to identify the more appropriate benchmarks for the analyzed fund return. Then, we compute their corresponding higher moment estimated errors-in-variables, i.e. the measurement error series introducing the (cross) moments of order three and four. We adjust the selected benchmarks by subtracting their higher moments estimated EIV from the initial return series, to obtain an estimate of the true uncontaminated benchmarks. We finally run the Kalman filter on these adjusted regressors. Analyzing EDHEC alternative indexes styles, we show that this technique improves the factor loadings and permits to identify more precisely the return sources of the considered hedge fund strategy. [less ▲]

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See detailImplementation of an active school project in a rural environment in Wallonia. A collaborative study
Cloes, Marc ULg; Dequenne, Aurélie

Conference (2009, May)

Detailed reference viewed: 43 (8 ULg)
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See detailLa compensation des pertes
Richelle, Isabelle ULg

Conference (2009, May)

Detailed reference viewed: 13 (2 ULg)
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Peer Reviewed
See detailCalculs de structures basés sur la technique des level sets et la méthode de partition de l'unité
Moumnassi, Mohammed; Béchet, Eric ULg; Belouettar, Salim et al

in Actes du 9ème Colloque National en Calcul des Structures (2009, May)

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See detailSports injuries and risk factors in youth soccer [Abstract].
Frisch, Anne ULg; Urhausen, Axel; Seil, Romain et al

in Clinical Journal of Sport Medicine (2009, May), 19(3), 247

Detailed reference viewed: 46 (1 ULg)
See detailQuel feedback constructif sur des efforts de contextualisation d’un cours commun à l’ensemble des disciplines spécifiques en formation initiale d’enseignants du secondaire supérieur ?
Delcomminette, Séverine ULg; Leclercq, Dieudonné ULg

(2009, May)

Notre cours de Psychologie Educationnelle de l’Adolescent et du Jeune Adulte s’adresse aux étudiants universitaires qui, titulaires d’un master, visent à être professeurs dans l’enseignement secondaire ... [more ▼]

Notre cours de Psychologie Educationnelle de l’Adolescent et du Jeune Adulte s’adresse aux étudiants universitaires qui, titulaires d’un master, visent à être professeurs dans l’enseignement secondaire supérieur en Communauté française de Belgique. Dans ce contexte professionnalisant, se posent les problèmes (définition, exercisation, évaluation) liés aux compétences (Beckers, 2001 ; Beckers, Leclercq & Poumay, 2007) et au transfert des apprentissages (Tardif, 1999). Dès lors, notre dispositif de formation, au départ traditionnel, a tenté de relever les défis du situated learning (Anderson & al., 1996) et de l’apprentissage contextualisé (Bédard & Frenay, 2000). Nous avons reformulé nos objectifs en compétences, développé des activités et mis en place une évaluation plus ambitieuse en regard de la taxonomie de Bloom (1956, 1965). En outre, afin de lier théorie et pratique, nous avons débuté chaque chapitre par des enjeux (advance organizer selon Ausubel, 1968), injecté des témoignages d’enseignants balayant les différentes disciplines spécifiques et proposé des pistes d’intervention en classe. Comment ces efforts de contextualisation au service d’un meilleur apprentissage et d’une plus grande motivation (Viau, 1994) pour des concepts abstraits sont-ils perçus par les futurs enseignants ? Nous avons collecté leurs avis constructifs en regard de chacun des éléments clés de cette innovation : en termes de pertinence et clarté pour les enjeux, en termes de quantité pour les témoignages et en termes de liens avec le métier pour les pistes d'intervention. C’est la synthèse quantitative éclairée d’un regard qualitatif que nous proposons. [less ▲]

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See detailWind tunnel investigation of the stall flutter oscillations of a bridge deck
Andrianne, Thomas ULg; Dimitriadis, Grigorios ULg

in Proceedings of the 8th National Congress on Theoretical and Applied Mechanics (2009, May)

Torsional Stall Flutter (TSF) is a one degree of freedom, self-excited phenomenon induced by the periodic separation/re-attachment of the flow around a body. The present paper proposes an experimental ... [more ▼]

Torsional Stall Flutter (TSF) is a one degree of freedom, self-excited phenomenon induced by the periodic separation/re-attachment of the flow around a body. The present paper proposes an experimental investigation of TSF on a bridge deck. A section model free to oscillate in torsion is tested in a low-speed wind tunnel. Static and dynamic tests are performed to enable a complete interpretation of the phenomena involved. For low airspeeds, the Karman vortex shedding excites the structure, resulting in small oscillations at the vortex shedding frequency. For high airspeeds, the deck undergoes Limit Cycle Oscillations (LCO) due to the TSF phenomenon. Nevertheless the Karman vortex shedding excitation is still present and appears in the measured forces signals. Peaks and troughs in the lift coefficient are detected for each pitching period. They are interpreted as the separation/re-attachment of the flow around the deck. The large amplitudes motion of the deck undergoing TSF reduces the amplitude of the aerodynamic lift coefficient. [less ▲]

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See detailInfluence functions of the error rates of classification based on clustering
Ruwet, Christel ULg; Haesbroeck, Gentiane ULg

Poster (2009, May)

Cluster analysis may be performed when one wishes to group similar objects into a given number of clusters. Several algorithms are available in order to construct these clusters. In this poster, focus ... [more ▼]

Cluster analysis may be performed when one wishes to group similar objects into a given number of clusters. Several algorithms are available in order to construct these clusters. In this poster, focus will be on two particular cases of the generalized k-means algorithm : the classical k-means procedure as well as the k-medoids algorithm, while the data of interest are assumed to come from an underlying population consisting of a mixture of two groups. Among the outputs of these clustering techniques, a classification rule is provided in order to classify the objects into one of the clusters. When classification is the main objective of the statistical analysis, performance is often measured by means of an error rate. Two types of error rates can be computed : a theoretical one and a more empirical one. The first one can be written as ER(F, Fm) where F is the distribution of the training sample used to set up the classification rule and Fm (model distribution) is the distribution under which the quality of the rule is assessed (via a test sample). The empirical error rate corresponds to ER(F, F), meaning that the classification rule is tested on the same sample as the one used to set up the rule. In case there are some outliers in the data, the classification rule may be corrupted. Even if it is evaluated at the model distribution, the theoretical error rate may then be contaminated, while the effect of contamination on the empirical error rate is two-fold : the rule but also the test sample are contaminated. To measure the robustness of classification based on clustering, influence functions have been computed, both for the theoretical and the empirical error rates. When using the theoretical error rate, similar results as those derived by Croux et al (2008) and Croux et al (2008) in discriminant analysis were observed. More specifically, under optimality (which happens when the model distribution is FN = 0.5N(μ1, ) + 0.5N(μ2, ), Qiu and Tamhane 2007), the contaminated error rate can never be smaller than the optimal value, resulting in a first order influence function identically equal to 0. Second order influence functions would then need to be computed, as this will be done in future research. When the optimality does not hold, the first order influence function of the theoretical error rate does not vanish anymore and shows that contamination may improve the error rate achieved under the non-optimal model. Similar computations have been performed for the empirical error rate, as the poster will show. The first and, when required, second order influence functions of the theoretical and empirical error rates are useful in their own right to compare the robustness of the 2-means and 2-medoids classification procedures. They have also other applications. For example, they may be used to derive diagnostic tools in order to detect observations having an unduly large influence on the error rate. Also, under optimality, the second order influence function of the theoretical error rate can yield asymptotic relative classification efficiencies. [less ▲]

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See detailGénération de maillages pour la creation de modèles biomécaniques du cerveau
D'Otreppe, Vinciane ULg; Boman, Romain ULg; Ponthot, Jean-Philippe ULg

in Raous, Michel; Pasquet, Philippe; Rey, Christian (Eds.) Neuvième Colloque National en Calcul des Structures (2009, May)

Nous présentons une méthode efficace et automatique pour générer des maillages éléments finis surfaciques de haute qualité et de bonne fidélité géométrique au départ d’images médicales segmentées. Cette ... [more ▼]

Nous présentons une méthode efficace et automatique pour générer des maillages éléments finis surfaciques de haute qualité et de bonne fidélité géométrique au départ d’images médicales segmentées. Cette méthode est basée sur l’algorithme du Marching Tetrahedra auquel nous avons adjoint des techniques permettant d’ajuster la topologie et les positions nodales du maillage afin de renforcer la qualité des éléments tout en respectant la géométrie de l’objet présent dans les images. Le but ultime de l’approche est la modélisation du cerveau lors d’interventions neurochirurgicales. [less ▲]

Detailed reference viewed: 79 (28 ULg)
See detailLatitudinal and local time distribution of the O2 infrared nightglow and O density in the lower thermosphere
Soret, Lauriane ULg; Gérard, Jean-Claude ULg; Saglam, Adem et al

Poster (2009, May)

Atomic oxygen is the major component in the Earth’s upper thermosphere. The O density reaches a maximum of about 3x1010 cm-3 near 100 km. The 1.27 µm emission of the IR Atmospheric bands generated by ... [more ▼]

Atomic oxygen is the major component in the Earth’s upper thermosphere. The O density reaches a maximum of about 3x1010 cm-3 near 100 km. The 1.27 µm emission of the IR Atmospheric bands generated by recombination of O atoms has been observed in the nightglow. On the night side, the O2 airglow peaks at ~95 km with a value of ~10 MR. <br />Atomic oxygen is present in the Martian atmos-phere but that the intensities values are below the cur-rent instrument detectability threshold. The Mars at-mosphere oxygen density is highly variable, depending on the altitude, temperature, latitude and longitude. <br />On Venus, atomic oxygen has been measured in situ only above 145 km on both the day and the night sides. Limb observations obtained with the Venus In-frared Thermal Imaging Spectrometer (VIRTIS) on board Venus Express show that the O2 infrared nightglow peaks at ~97 km, with a mean intensity val-ue of about 1,3 MR [1, 2]. Yet, the distribution is largely inhomogeneous, with an enhanced region of ~3 MR statistically located near the midnight meridian at low latitude [3]. The oxygen density can be mapped using the O2 airglow and CO2 density vertical distribu-tions [4]. The O2 volume emission rates are obtained with an Abel inversion of the O2 limb profiles and CO2 vertical distributions are taken from the Venus International Reference Atmosphere (VIRA) model. The results show that the O density peak is located between 93 and 105 km (with a mean value of 104 km) and ranges from 2.8x1010 to 8.5x1011 cm-3 (with a mean value of 2.2x1011 cm-3). No correlations between the peak altitude and the latitude or the peak altitude and the local time are observed. However, the O density decreases and its variability increases while moving away from the antisolar point. [less ▲]

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See detailDTS: a Decentralized Tracing System
Masui, Kenji; Donnet, Benoît ULg

in First International Workshop on Traffic Monitoring and Analysis (2009, May)

A new generation of widely distributed systems to measure the Internet topology at the interface level is currently being deployed. Cooperation between monitors in these systems is required in order to ... [more ▼]

A new generation of widely distributed systems to measure the Internet topology at the interface level is currently being deployed. Cooperation between monitors in these systems is required in order to avoid over-consumption of network resources. This paper proposes an architecture for a distributed topology measurement (DTM) system that, for the first time, decentralizes probing information. The key idea of our proposal is that, by utilizing a shared database as a communication method among monitors and taking advantage of the characteristics of the Doubletree algorithm, we can get rid of a specific control point, and a DTM system can be constructed in a decentralized manner. In this paper, we describe our implementation of a DTM, called Decentralized Tracing System (DTS). Decentralization within DTS is achieved using various distributed hash tables (DHTs), each one being dedicated to a particular plane (i.e., control or data). We also provide preliminary evaluation results. [less ▲]

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See detailDiagnostic et traitement des troubles de la mobilité laryngée
FINCK, Camille ULg

Conference (2009, May)

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See detailGroup B streptococcal Screening, Diagnosis and Clinically Relevant Resistance
Melin, Pierrette ULg

in DEVANI Training (Ed.) European Workshop Current Insights into Group B Streptococcal Diseases (2009, May)

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See detailOutils de contrôle de gestion et performance des collectivités locales : un état de la littérature
Togodo Azon, Degodo Aimé ULg; Van Caillie, Didier ULg

in Association Francophone de Comptabilbilité (Ed.) Actes du 30ème Congrès de l'Association Francophone de Comptabilité (2009, May)

Our communication is essentially a state of the literature that aims (1) to present the different aspects of the concept of the performance of the local collectivities (2) to sketch the different tools of ... [more ▼]

Our communication is essentially a state of the literature that aims (1) to present the different aspects of the concept of the performance of the local collectivities (2) to sketch the different tools of performance used in the local collectivities and (3) to see to what finalities and missions they answer. This state of the literature allowed us to note that all indicators of performance and all tools of piloting of the performance in force in the classic organizations can also be adapted to the local collectivities. He/it is evident from the literature that at all times the budget is the tool the more used. Of other modern tools as the benchmarking, the control panel and the balanced scorecard are more and more in vogue in the local collectivities. These different tools are used in three finalities: ethical, economic and political. [less ▲]

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See detailIncentives for BGP Guided IP-Level Topology Discovery
Donnet, Benoît ULg

in First International Workshop on Traffic Monitoring and Analysis (2009, May)

Internet topology discovery has been an attractive research field during the past decade. In particular, the research community was interested in modeling the network as well as providing efficient tools ... [more ▼]

Internet topology discovery has been an attractive research field during the past decade. In particular, the research community was interested in modeling the network as well as providing efficient tools, mostly based on traceroute, for collecting data. In this paper, we follow this track of rendering traceroute-based exploration more efficient. We discuss incentives for coupling passive monitoring and active measurements. In particular, we show that high-level information, such as BGP updates, might be used to trigger targeted traceroutes. As a result, the network dynamics might be better capture. We also provide a freely available tool for listening to BGP feeds and triggering dedicated traceroutes. [less ▲]

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See detailMilitary cultures and education: harmonizing or standardizing Europe?
Paile, Sylvain ULg

Conference (2009, May)

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See detailEvaluation, correction et validation de modèles de composants d'une centrale de production d'eau glacée
Lemort, Vincent ULg; Lebrun, Jean ULg

(2009, May)

Ce papier présente des outils d’évaluation, de correction et de validation des modèles de simulation d’un groupe frigorifique et d’une batterie froide. Après avoir brièvement décrit les modèles, le papier ... [more ▼]

Ce papier présente des outils d’évaluation, de correction et de validation des modèles de simulation d’un groupe frigorifique et d’une batterie froide. Après avoir brièvement décrit les modèles, le papier montre comment leurs paramètres peuvent être identifiés sur base uniquement des performances publiées par les constructeurs. Cette information est incomplète et des hypothèses rationnelles sont proposées. Les modèles sont validés par comparaison des résultats de simulations avec à ceux obtenus au moyen d’autres modèles et/ou avec des données expérimentales. Ces comparaisons conduisent finalement à encore améliorer les modèles et à en ré-ajuster les paramètres. [less ▲]

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See detailOn the Impact of Clustering on Measurement Reduction
Saucez, Damien; Donnet, Benoît ULg; Bonaventure, Olivier

in 8th International IFIP-TC 6 Networking Conference (2009, May)

Measuring a path performance according to one or several metrics, such as delay or bandwidth, is becoming more and more pop- ular for applications. However, constantly probing the network is not suitable ... [more ▼]

Measuring a path performance according to one or several metrics, such as delay or bandwidth, is becoming more and more pop- ular for applications. However, constantly probing the network is not suitable. To make measurements more scalable, the notion of clustering has emerged. In this paper, we demonstrate that clustering can limit the measurement overhead in such a context without loosing too much accuracy. We first explain that measurement reduction can be observed when vantage points collaborate and use clustering to estimate path performance. We then show, with real traces, how effective is the overhead reduction and what is the impact in term of measurement accuracy. [less ▲]

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See detailBacterial leaching of complex sulphides from mine tailings altered by acid drainage
Kitobo, Willy; Gaydardzhiev, Stoyan ULg; Frenay, Jean ULg et al

in Dominic, Esteban (Ed.) Bacterial leaching of complex sulphides from mine tailings altered by acid drainage (2009, May)

An experimental study aimed at re-flotation of laid down tailings from Kipushi (DRC) to bring sulphide concentrate suitable for further processing by hydrometallurgical means has been realized. The ... [more ▼]

An experimental study aimed at re-flotation of laid down tailings from Kipushi (DRC) to bring sulphide concentrate suitable for further processing by hydrometallurgical means has been realized. The results from a bioleaching route chosen to accomplish the later task by use of moderate thermophilic and mesophilic microorganisms are reported. It has been found that due to the complexity of the treated material, the leaching pattern of the two principal metals of interest, copper and zinc vary. Whilst the copper bearing minerals have been leached relatively fast by direct mechanism, the leaching kinetics for the zinc minerals has been moderate involving predominantly an indirect mechanism. The effects of pH and temperature variations and ferrous ions addition upon the extent of copper and zinc dissolution have been examined. The presence of ferrous ions has been found beneficial for the leaching of sphalerite, however the concomitant formation of jarosite precipitates has led to copper leaching hindrance. Similarly, the rapid zinc solubilisation has been counterbalanced by decrease in rate of copper dissolution. [less ▲]

Detailed reference viewed: 346 (41 ULg)
See detailThe ultraviolet nitric oxide emission in the nightside atmospheres of Venus and Mars
Cox, Cédric ULg; Gérard, Jean-Claude ULg; Bertaux, J. L.

Conference (2009, May)

Detailed reference viewed: 15 (0 ULg)
See detailDecoherence-enhanced measurements
Braun, Daniel; Martin, John ULg

Conference (2009, May)

Detailed reference viewed: 15 (0 ULg)
Peer Reviewed
See detailThéorie par l'exemple, théorie de l'exemple. À propos de Palimpsestes
Stienon, Valérie ULg

Conference (2009, May)

Detailed reference viewed: 46 (1 ULg)
See detailA drop of spectroscopy
Terwagne, Denis ULg; Gilet, Tristan ULg; Vandewalle, Nicolas ULg et al

Conference (2009, May)

Detailed reference viewed: 13 (5 ULg)
See detailA role for PSA-NCAM-dependent neuron-glia interactions in the control of GnRH neuron activity
Franceschini, Isabelle; Desroziers, Elodie ULg; Lomet, Didier et al

Poster (2009, May)

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See detailHighly Transient Mixed Flows with Air/Water Interactions: Homogeneous Equilibrium Model and Friction Correlations
Kerger, François ULg; Archambeau, Pierre ULg; Erpicum, Sébastien ULg et al

in Proceedings of the 8th National Congress on Theoretical and Applied Mechanics (2009, May)

Detailed reference viewed: 69 (10 ULg)
See detailAirglow and aurora
Gérard, Jean-Claude ULg

Conference (2009, May)

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See detailValidation of a measure of leader behavioral adequacy
De Zanet, Fabrice ULg; Stinglhamber, Florence; Dujardin, Jean-Marie ULg

Poster (2009, May)

Detailed reference viewed: 40 (13 ULg)
See detailIntentionality and Meaning in Heidegger and Wittgenstein
Gauvry, Charlotte ULg

Conference (2009, May)

Detailed reference viewed: 14 (0 ULg)
See detailBiogeochemical changes in the North Pacific in response to a shut down of the Atlantic meridional overturning
Menviel, L.; Timmermann, A.; Timm, O. et al

Conference (2009, May)

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See detailAn instrument to analyse the representation of socio-constructivist approach in Wallonian physical education teachers
Cloes, Marc ULg; Berwart, Gilles; Frédéric, Olivier

Poster (2009, May)

Socio-constructivism is a learning process where people build their knowledge with help of interactions with others as well as with their milieu. The support to teaching strategies respecting the ... [more ▼]

Socio-constructivism is a learning process where people build their knowledge with help of interactions with others as well as with their milieu. The support to teaching strategies respecting the principles of socio-constructivist approaches is growing in the field of education. hysical education teacher educators propose more and more this concept as a guide to their students. Interventions are also proposed to make inservice teachers sensitive to it. ... [less ▲]

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See detailAnalysis of the representations of school and physical education roles in combating obesity
Cloes, Marc ULg; Ziant, Nicolas

Poster (2009, May)

Obesity is currently one of the priorities for interventions in health promotion. This study aimed to identify the perceptions of two groups of subjects about what school and PE could/should do in ... [more ▼]

Obesity is currently one of the priorities for interventions in health promotion. This study aimed to identify the perceptions of two groups of subjects about what school and PE could/should do in relation to the issues of obesity among young people. [less ▲]

Detailed reference viewed: 84 (9 ULg)
See detailSeasonal variability of carbon dioxide and methane in the rivers and lagoons of Ivory Coast (West Africa)
Koné, Y.J.M.; Abril, G.; Delille, Bruno ULg et al

Poster (2009, May)

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See detailContamination des sols par les activités minières à Lubumbashi (RDC). Incidences en matière de diagnostic et de choix de solutions de gestion.
Mpundu Mubemba, Michel; Ngoy Shutcha, Mylor; Faucon, Michel-Pierre et al

in Schwartz, Dominique (Ed.) Actes des 10emes JES (2009, May)

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See detailBidding and managing congestion across multiple electricity spot markets
Marinakis, Adamantios ULg; Bakirtzis, Anastasios; Van Cutsem, Thierry ULg

in Proc. 6th Intern. Conference on the European Energy Market (2009, May)

The possibility for market participants to place their bids in markets where they are not geographically located is investigated in this paper. A framework for managing the resulting congestion is ... [more ▼]

The possibility for market participants to place their bids in markets where they are not geographically located is investigated in this paper. A framework for managing the resulting congestion is proposed. The procedure is illustrated and commented on a test system. [less ▲]

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See detailComparison of O2 IR and NO UV night airglow variations on Mars and Venus
Brecht; Bougher, S. W.; Gérard, Jean-Claude ULg et al

Conference (2009, May)

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See detailAnisotropic continuum damage model coupled to viscoplasticity for a pressure dependent alveolar bone remodeling law
Mengoni, Marlène ULg; Ponthot, Jean-Philippe ULg

in National Congress on Theoretical and Applied Mechanics (2009, May)

Detailed reference viewed: 66 (21 ULg)
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See detailIs hypoxia-inducible factor 1 an actor in migraine pathogenesis?
TRUONG, Julie ULg; Mascetti, Laura; Schoenen, Jean ULg et al

Poster (2009, May)

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See detailLes sutures en dentisterie : cours théorique et travaux pratiques
LAMBERT, France ULg

Conference (2009, April 30)

Detailed reference viewed: 25 (4 ULg)
See detailSciences Institutions Responding to Reflexive Modernization
Delvenne, Pierre ULg

Conference (2009, April 30)

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See detailAnalyse des incidents médicamenteux au CHU de Liège
Bottari, Ludovic; Maesen, Didier ULg; Van Hees, Thierry ULg

Conference (2009, April 28)

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See detailImmunoCAP© ISAC: interest in allergy diagnosis
Gadisseur, Romy ULg; Chapelle, Jean-Paul ULg; Cavalier, Etienne ULg

Conference (2009, April 28)

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See detailApproche pratique face à l'hypertension non contrôlée
Krzesinski, Jean-Marie ULg

Conference (2009, April 28)

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See detailA new mechanism of upwelling generated filaments based on potential vorticity balance
Troupin, Charles ULg; Mason, Evan; Beckers, Jean-Marie ULg et al

Conference (2009, April 27)

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See detailDetection and characterization of tilted peptides in amyloid proteins
Crowet, Jean-Marc ULg; Lins, Laurence ULg; Brasseur, Robert ULg

Poster (2009, April 25)

The study of amyloidogenic proteins is of interest in biochemistry because these proteins undergo conformational changes and aggregation. Both processes are largely implicated in several diseases ... [more ▼]

The study of amyloidogenic proteins is of interest in biochemistry because these proteins undergo conformational changes and aggregation. Both processes are largely implicated in several diseases including Alzheimer’s, Parkinson’s or Creutzfeldt-Jakob’s disease. These phenomena are not completely understood, either at a structural or energetical point of view. Tilted peptides are short protein fragment (11 to 19 residues) that adopt a tilted orientation when inserted into biological membranes and destabilise them. Recently, tilted peptides have been detected in two amyloidogenic proteins involved in neurodegenerative diseases; the amyloid  peptide responsible for Alzheimer’s disease, and the PrP protein that causes Creutzfeldt-Jakob’s disease. Tilted peptides could be responsible for the neurotoxic effects of these proteins. Due to their destabilising properties, they could interact directly with the membrane leading to cell death. Tilted peptides could also be involved in the transconformational process of the proteins. The aim of this work is to detect tilted fragments in other amyloidogenic proteins by molecular modelling and to study some of these peptides experimentally to evidence their lipid destabilizing properties, their structure and their toxicity. Twenty-four tilted peptides from 18 different proteins have been detected among 53 amyloidogenic proteins and 7 peptides were tested experimentally. The results support the hypothesis that some tilted peptides could be involved in transconformational processes and/or cytotoxicity related to amyloidogenic proteins. [less ▲]

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See detailLa construction d'une identité jésuite : le corps et la mémoire
Delfosse, Annick ULg

Conference (2009, April 24)

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See detailNovel (co)polymers by cobalt-mediated radical polymerization
Debuigne, Antoine ULg; Piette, Yasmine ULg; Poli, Rinaldo et al

Poster (2009, April 24)

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See detail3D modelling of the Black Sea ecosystem
Capet, Arthur ULg; Beckers, Jean-Marie ULg; Joassin, Pascal et al

Poster (2009, April 24)

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See detailThe 1958-2008 Greenland ice sheet surface mass balance variability simulated by the regional climate model MAR
Fettweis, Xavier ULg

Poster (2009, April 24)

Results made with the regional climate model MAR over 1958-2008 show a very high interannual variability of the Greenland ice sheet (GrIS) surface mass balance (SMB) modelled in average to be 330 +/- 130 ... [more ▼]

Results made with the regional climate model MAR over 1958-2008 show a very high interannual variability of the Greenland ice sheet (GrIS) surface mass balance (SMB) modelled in average to be 330 +/- 130 km^3/yr. To a first approximation, the SMB variability is driven by the annual precipitation anomaly minus the meltwater run-off rate variability. Sensitivity experiments carried out by the MAR model evaluate the impacts on the surface melt of (i) the summer SST around the Greenland, (ii) the snow pack temperature at the beginning of the spring, (iii) the winter snow accumulation, (iv) the solid and liquid summer precipitations and (v) the summer atmospheric circulation. This last one, by forcing the summer air temperature above the ice sheet, explains mainly the surface melt anomalies. [less ▲]

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See detailTransferring a calibration model and a spectral library to a soil analysis laboratories network
Genot, Valérie ULg; Colinet, Gilles ULg; Dardenne, Pierre et al

in EGU 2009 Book of abstracts (2009, April 23)

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See detailDiscours critiques face au modèle dominant dans les sciences de la gestion
Robert, Jocelyne ULg

Conference (2009, April 23)

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See detailComparison of transport in lysimeters with undisturbed loamy sand and silty soil using non invasive imaging with electrical resistivity tomography.
Garré, Sarah ULg; Koestel, Johannes; Vanderborght, Jan et al

in Geophysical Research Abstracts (2009, April 23)

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See detailThe 1958-2008 Greenland ice sheet surface melt and the mid-tropospheric atmospheric circulation
Fettweis, Xavier ULg

Conference (2009, April 23)

With the aim to study the impact of the mid-tropospheric circulation on the Greenland ice sheet (GrIS) surface melt simulated by the regional climate model MAR, we developed an automatic Circulation Type ... [more ▼]

With the aim to study the impact of the mid-tropospheric circulation on the Greenland ice sheet (GrIS) surface melt simulated by the regional climate model MAR, we developed an automatic Circulation Type Classification (CTC) based on the 500hPa geopotential height from reanalyses over the period 1958-2008. This CTC shows that the dominant mode of the regional atmospheric summer variability around the GrIS is linked to the North Atlantic Oscillation (NAO) and that the surface melt anomalies are highly correlated to the general circulation. It explains notably why a record surface melt was observed during the summers 2007 and 2008. In addition, the climate conditions occurring the 27th August of 2003, where the GrIS temperature was 10°C higher than the normal, were the consequence of an almost unique 500 hPa circulation in the 50 last years. [less ▲]

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See detailLambeau hétéroplapébral dans la reconstruction de la paupière inférieure : expérience de 21 ans
BATCHVAROVA, Z; XHAUFLAIRE, Gaël ULg; KRASTINOVA, Darina

Conference (2009, April 23)

Introduction : L’importance physiologique de la paupière inférieure est souvent sous-estimée. Si la protection du globe oculaire est assurée essentiellement par la paupière supérieure, c’est la paupière ... [more ▼]

Introduction : L’importance physiologique de la paupière inférieure est souvent sous-estimée. Si la protection du globe oculaire est assurée essentiellement par la paupière supérieure, c’est la paupière inférieure qui assure le drainage lacrymal, complète l’occlusion palpébrale et joue un rôle important dans le regard et l’expression du visage. Choisir la technique simple et fiable pour reconstruire une perte de substance de la paupière inférieure et rétablir sa fonction et son esthétique est une épreuve pour le chirurgien. Objectifs et Méthodes : Nous rapportons notre expérience de 21 ans dans la reconstruction de la paupière inférieure par un lambeau hétéro-palpébral de la paupière supérieure. Discussion : Nous décrivons notre technique chirurgicale, les différents types de lambeaux, leurs indications et les gestes associés qui nous ont permis d’obtenir de très bon résultats fonctionnels et esthétiques chez 173 patients, porteurs de pathologies palpébrales variées : malformations congénitales, paralysie faciale, anophtalmie, brûlures, tumeurs, séquelles post traumatiques, ectropion involutif et complications post blépharoplastie esthétique. Conclusion : Dans la reconstruction de la paupière inférieure le lambeau hétéro- palpébral apporte des tissus identiques, un support dynamique, il soutient le globe oculaire et permet la réalisation des gestes associés. [less ▲]

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See detailPrion: Biosafety Level 3-unconventional transmissible agent
Zorzi, Willy ULg; Elmoualij, Benaïssa ULg

Conference (2009, April 22)

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See detailThe location and topology of electron beams in Io‘s wake
Jacobsen, Sven; Saur, Joachim; Neubauer, Friz et al

Conference (2009, April 22)

The Galileo spacecraft measured hot field aligned electron beams near Io during three flybys. We apply our 3D MHD model of the Io-Jupiter interaction to constrain the location and shape of field aligned ... [more ▼]

The Galileo spacecraft measured hot field aligned electron beams near Io during three flybys. We apply our 3D MHD model of the Io-Jupiter interaction to constrain the location and shape of field aligned electron beams for the individual flyby scenarios. Io continuously generates MHD waves by disturbing the Jovian magnetoplasma. Currents carried by Alfvén waves propagate predominantly along the magnetic field lines. The waves accelerate electrons as the number of charge carriers decreases on their way to Jupiter. These energetic electrons precipitate into the Jovian ionosphere, visible as prominent Io footprint emission in the Jovian aurora. On the other hand electrons have to be accelerated upward to form the beams measured by Galileo. Unlike the beam formation, the position and spatial structure of these beams has been poorly discussed. We adopt our 3D MHD model initial conditions to the individual flyby scenario and determine the spatial morphol- ogy of beams in Io’s orbital plane. We compare our findings to Galileo observations and find very good agreement. Moreover, we use our model to further investigate in detail a recent concept which involves cross-hemisphere electron beams to explain certain auroral features of the Io footprint emission such as a leading spot and secondary spots [Bonfond et al., 2008]. Our results indicate that besides geometrical properties, such as Io’s position in the torus, the incoming plasma density controls the travel path and topology of an electron beam. [less ▲]

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See detailGround water flow simulation in mining works: Application of the Hybrid Finite Element Mixing Cell method
Wildemeersch, Samuel ULg; Orban, Philippe ULg; Brouyère, Serge ULg et al

Conference (2009, April 22)

Hydrogeological models can greatly help simulating groundwater flow in the particular context of mining works. However, classical modeling techniques are not so suited in this context because the medium ... [more ▼]

Hydrogeological models can greatly help simulating groundwater flow in the particular context of mining works. However, classical modeling techniques are not so suited in this context because the medium is strongly disturbed by shafts and networks of galleries. Consequently, specific modeling techniques have been developed. Box model techniques require only few parameters but they calculate only mean water levels in exploited zones and do not consider interactions between exploited and unexploited zones. Conversely, physically-based and spatially-distributed techniques represent explicitly both exploited and unexploited zones and take into account interactions between them but they require a lot of parameters sometimes difficult to estimate. The Hybrid Finite Element Mixing Cell (HFEMC) method is a new modeling technique constituting a compromise between simple and complex techniques used in mining context. The principle of this method is to fully couple a representation of exploited zones by a group of mixing cells possibly interconnected by pipes and a representation of unexploited zones by classical finite elements. Interactions between mixing cells and finite elements of the mesh are taken into account through 3rd type (Fourier) internal boundary conditions. With this method, exploited zones are characterized by mean water levels while spatially-distributed hydraulic heads are calculated for the entire adjacent and overlaying unexploited zones. Additionally, thanks to the coupling between mixing cells and finite elements, water exchanges between exploited and unexploited zones are explicitly taken into account. The HFEMC method allows also simulating groundwater rebound following mine closure and associated phenomena such as water inrushes. Concepts and equations of the HFEMC method are presented and illustrated using test cases. First results of an application on an abandoned coalfield in the region of Liege (Belgium) are also proposed. [less ▲]

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See detailModelling uncertainties in the climate of the last millennium : The ASTER project
Loutre, M. F.; Mouchet, Anne ULg; Fichefet, T. et al

Poster (2009, April 21)

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See detailMiddle Miocene climate and vegetation modelling with PLASIM and CARAIB
Henrot, Alexandra ULg; François, Louis ULg; Favre, Eric ULg et al

Conference (2009, April 21)

In a long-term climatic cooling trend, the Middle Miocene represents one of the last warm periods of the Neogene, culminating with the Miocene Climatic Optimum, MCO (17-15 My). Palynological studies ... [more ▼]

In a long-term climatic cooling trend, the Middle Miocene represents one of the last warm periods of the Neogene, culminating with the Miocene Climatic Optimum, MCO (17-15 My). Palynological studies suggest that the warmer climatic conditions prevailing during the MCO allowed warm forests to expand poleward of the subtropical zone, with evergreen forests proliferating in North America and Europe (Jimenez-Moreno and Suc, 2007, Palaeogeogr. Palaeoclimatol. Palaeoecol. 253: 208-225). In this work, we used the Planet Simulator (Fraedrich et al., 2005, Meteorol. Z. 14: 299-304 and 305-314), an Earth system model of intermediate complexity, to carry out several simulation experiments, where we have assessed the effects of the absence of ice on the continents, the opening of the Central American and Eastern Tethys seaways, the lowering of the topography on land and the effect of various atmospheric CO2 concentrations, in agreement with the values reported in the litterature. We then produced several vegetation distributions, using the dynamic vegetation model CARAIB (Galy et al., 2008, Quat. Sci. Rev. 27: 1396-1409), to analyse if the climatic forcings considered are sufficient to explain the expansion of warmer forest types to higher latitudes. Our results indicate that an increase of atmospheric CO2 concentration, higher than the present-day one, is necessary to allow subtropical forest types to expand poleward. This result agrees with recent paleo-atmospheric CO2 reconstruction from stomatal frequency analysis, which suggests 500 ppmv of CO2 during the MCO. However, the required warming may be due to processes not considered in our setup (e.g. full oceanic circulation or other greenhouse gases). [less ▲]

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See detailHigh-resolution Climatology of the North-East Atlantic using Data-Interpolating Variational Analysis
Troupin, Charles ULg; Machín, Francisco; Ouberdous, Mohamed ULg et al

Conference (2009, April 21)

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See detailInterannual variability of CO2 fluxes and yield by a winter wheat crop (Triticum aestivum L.)
Dufranne, Delphine ULg; Vancutsem, Françoise ULg; Moureaux, Christine ULg et al

Poster (2009, April 20)

In this study, two winter wheat (Triticum aestivum L.) cropping seasons were compared at the Lonzée (Belgium) experimental site. The site, crop management, sowing and harvest dates were similar on the two ... [more ▼]

In this study, two winter wheat (Triticum aestivum L.) cropping seasons were compared at the Lonzée (Belgium) experimental site. The site, crop management, sowing and harvest dates were similar on the two years. The main difference between the seasons was due to to climate conditions. Continuous eddy-covariance fluxes, leaf scale photosynthesis measurements and crop development monitoring were performed during the whole vegetation periods. Globally, the two years were characterised by a higher than normal air temperature (9.9 °C and 11.9 °C respectively against 9.4 °C for standard) and lower than normal rainfalls (595.1 mm and 675.1 mm respectively against 772 mm for standard). In addition, the second season (2006-2007) was characterised by an exceptionally mild winter, dry and hot conditions in April and by humid and cloudy conditions during the last vegetation phases. These particular conditions induced earlier growth stages and the comparison of global fluxes gives contrasting results: gross primary productivity (GPP) was larger in 2007 but, on the contrary, net primary productivity (NPP) and crop productivity were lower on this year. The bad yields could be explained, on one hand by the drought in April 2007 that induced abnormally small flag leaves, on the other hand by cloudy and humid conditions from end May to harvest, that induced an assimilation reduction due to low radiation and favoured disease development. The simultaneous higher GPP and lower NPP and productivity in 2006-2007 raise the question of carbon allocation. It suggests that the excess carbon assimilated in 2006-2007 was not stored in grain or straw and thus that it would have been stored in the roots or in vegetation parts that decompose before the harvest. Further biomass measurements (and especially root biomass) are necessary to confirm this hypothesis. [less ▲]

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See detailEvolution of Western Mediterranean Sea Surface Temperature between 1985 and 2005
Troupin, Charles ULg; Lenartz, Fabian; Sirjacobs, Damien ULg et al

Conference (2009, April 20)

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See detailBiogeochemistry and carbon budget during a coccolithophorid bloom in the northern Bay of Biscay (June 2006)
Harlay, Jérôme ULg; Borges, Alberto ULg; De Bodt, Caroline et al

Poster (2009, April 19)

Carbon cycling processes (primary production (PPp), calcification (CAL), bacterial production and pelagic community respiration (PCR)) and variables (partial pressure of CO2 (pCO2) and total alkalinity ... [more ▼]

Carbon cycling processes (primary production (PPp), calcification (CAL), bacterial production and pelagic community respiration (PCR)) and variables (partial pressure of CO2 (pCO2) and total alkalinity (TA)) were measured in early June 2006 at several stations in the northern Bay of Biscay. These measurements were characterized with respect to the coccolithophorid blooming (growth or decline) based on satellite remote sensing (high reflectance (HR)) and other biogeochemical measurements i.e. inorganic nutrients, chlorophyll-a (Chl-a), phaeopigments (Phaeo), particulate inorganic carbon (PIC), particulate organic carbon (POC) and particulate nitrogen (PN)). The major HR patch was located over the shelf, along the continental margin and corresponded to declining bloom conditions characterized by moderate Chl-a <1.0 µg L-1, dissolved phosphate (PO4) depletion, low (<2.0 µmol L-1) dissolved silicate (DSi), low potential primary production (<0.25 µmol C L-1 h-1) and calcification rates (0.02-0.10 µmol C L-1 h-1). Yet, surface waters were undersaturated in CO2 with respect to atmospheric equilibrium. We present a coherent scheme of the C dynamics of a coccolithophorid bloom along the continental margin of the Bay of Biscay, an active hydrodynamic area, based on standing stocks and processes including 14C-based particulate primary production, CAL and PCR. A carbon budget obtained by integrating PPp, CAL and PCR over the water column highlights the importance of C extracellular production to sustain the bacterial demand in the twilight zone, which has also several repercussions on the fate of organic and inorganic C production in the photic zone during the different stages of the bloom. [less ▲]

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See detailFaux jumeaux et bisexualité dans les arts premiers et préhistoriques
Mélon, Jean; Jacob, Laurent; Stassart, Martine ULg

Conference (2009, April 19)

The author compares paleo- and neolithical artistic productions ( objects and pictures of the paleolithical art - 30 to 10.000 years bef. JC - and the neolithical -5 t 2.000 bef. JC) with modern or tribal ... [more ▼]

The author compares paleo- and neolithical artistic productions ( objects and pictures of the paleolithical art - 30 to 10.000 years bef. JC - and the neolithical -5 t 2.000 bef. JC) with modern or tribal sculptures. It appears that the most pregnant theme of these socalled primitive arts is symbolical bisexuality. [less ▲]

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See detailA new mechanism of upwelling generated filaments based on potential vorticity balance
Troupin, Charles ULg; Mason, Evan; Beckers, Jean-Marie ULg et al

Poster (2009, April 19)

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See detailS,T-climatologies of the North Sea using the Variational Inverse Method
Scory, Serge; Ouberdous, Mohamed ULg; Troupin, Charles ULg et al

Poster (2009, April 19)

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See detailRegulation of CXCL8/IL-8 expression by Zonula Occludens-1 in human breast cancer cells.
Mestdagt, M; Polette, M; Bindels, S et al

Poster (2009, April 18)

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See detailFhit implication in the control of tumor invasion process
Joannes, A; Bonnomet, Arnaud; Polette, Myriam et al

Poster (2009, April 18)

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See detailAdvanced Driver Assistance Systems in Commercial Vehicles and their Safety Potentials
Christen, Fréderic ULg; Zlocki, A.; Becher, T.

in 1. Automotive Colloquium Munich 2008 "Assistance Systems, Drive Units and Drive Trains" (2009, April 16)

Advanced driver assistance systems do not only promise higher driving comfort, but potential benefit for an increase of safety especially for commercial vehicles. Accidents with involve- ment of ... [more ▼]

Advanced driver assistance systems do not only promise higher driving comfort, but potential benefit for an increase of safety especially for commercial vehicles. Accidents with involve- ment of commercial vehicles normally have severe consequences. The Institut für Kraftfahr- zeuge (ika) of the RWTH Aachen University with support from the Institute of Road and Traffic Engineering (isac) of the RWTH Aachen University have investigated in cooperation with the Federal Highway Research Institute (BASt) current and future ADAS for commercial vehicle in order to determine the potential for their benefit to increase road safety. Based on the accidents of official statistics and in-depth analysis of accidents from the GIDAS data base, relevant accident reasons are assessed systematically for a possible interference with selected ADAS. The qualitatively estimated safety potential results from the superposition of the main accident characterisation, the accident type and the accident category. A detailed estimation of the safety potential is conducted by means of simulations with the traffic flow simulation tool PELOPS. A cost-benefit analysis of the investigated systems is conducted. [less ▲]

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See detailTennis et paris sportifs truqués
Fincoeur, Bertrand ULg

Conference (2009, April 16)

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Peer Reviewed
See detailImages, spectacles et médias: quelle place? quelles responsabilités?
Fincoeur, Bertrand ULg

Conference (2009, April 16)

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See detailL’aide juridique belge : entre expertise juridique et défense de causes politiques
Lejeune, Aude ULg

Conference (2009, April 14)

Dans nos sociétés où le recours au droit devient de plus en plus fréquent, de nombreuses initiatives sont mises en place tant par des professionnels du droit, des associations que par les pouvoirs publics ... [more ▼]

Dans nos sociétés où le recours au droit devient de plus en plus fréquent, de nombreuses initiatives sont mises en place tant par des professionnels du droit, des associations que par les pouvoirs publics afin de favoriser l’accès au droit et à la Justice pour l’ensemble des citoyens. Cette communication analyse l’apparition et la constitution d’un mouvement de contestation du système d’aide juridique belge et les stratégies utilisées par ce mouvement pour faire valoir son point de vue auprès des autorités publiques et des professionnels du droit concernés. Depuis les années 1960, l’aide juridique belge est marquée par deux orientations : une approche légaliste portée par les avocats dans le cadre de consultations organisées par les Ordres, permettant à tout citoyen d’avoir accès à l’expertise juridique d’un professionnel, et une approche militante dans le cadre de consultations dans des associations, des syndicats ou des "boutiques de droit", orientées vers une action de type politique. Suite au lobbying exercé par les avocats, la loi de 1998 relative à l’aide juridique soutient très majoritairement l’aide juridique qui s’inscrit dans la première conception de l’accès au droit. Face à cela, un mouvement de contestation, constitué d’avocats militants, d’associations spécialisées dans l’information juridique et d’hommes politiques, revendique un accès au droit qui ne se limite pas à une consultation « neutre » d’un expert du droit, mais à pratiquer une montée en généralités et à construire, à partir des situations singulières, des causes politiques . [less ▲]

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See detailPEGASE : UN MODÈLE INTÉGRÉ BASSIN HYDROGRAPHIQUE / RIVIÈRES POUR LA DIRECTIVE CADRE EUROPÉENNE
Deliège, Jean-François ULg; Everbecq, Etienne ULg; Grard, Aline ULg et al

Conference (2009, April 09)

Presentation of the PEGASE model (Planification Et Gestion de l’ASsainissement des Eaux), developed by the Aquapole Aquapole. New operational way to assess the evolution of the river quality in terms of ... [more ▼]

Presentation of the PEGASE model (Planification Et Gestion de l’ASsainissement des Eaux), developed by the Aquapole Aquapole. New operational way to assess the evolution of the river quality in terms of presures on them, as well as a tool to help competent authorities to optimise the cost/efficiency ratio of the measures foreseen to reduce the impact of these pressures. [less ▲]

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See detailCognitive and affective mechanisms involved in hallucination-proneness
Laroi, Frank ULg

Conference (2009, April 09)

Detailed reference viewed: 13 (1 ULg)