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See detailConnectivité trophique entre deux écosystèmes: le cas des litières de laminaires et des substrats meubles côtiers
Vandenbosch, François; Dauby, Patrick ULg; Lepoint, Gilles ULg et al

Conference (2014, November 24)

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See detailInteractions between particles in a magnetocapillary self-assembly
Lagubeau, Guillaume ULg; Darras, Alexis; Grosjean, Galien ULg et al

Conference (2014, November 24)

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See detailRemote control of self-assembled microswimmers
Vandewalle, Nicolas ULg; Grosjean, Galien ULg; Darras, alexis et al

Conference (2014, November 24)

Physics governing the locomotion of microorganisms and other microsystems is dominated by viscous damping. An effective swimming strategy involves the non-reciprocal and periodic deformations of the ... [more ▼]

Physics governing the locomotion of microorganisms and other microsystems is dominated by viscous damping. An effective swimming strategy involves the non-reciprocal and periodic deformations of the considered body. Herein, we show that a magnetocapillary-driven self-assembly, composed of three soft-ferromagnetic beads, is able to swim along a liquid-air interface when driven by an external magnetic field. Moreover, the system can be fully controled, opening ways to explore low Reynolds number swimming and to create micromanipulators in various applications. [less ▲]

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See detailPrototype SOLAP appliqué sur des champs continus en mode raster. Analyse de hot spots de criminalité.
Kasprzyk, Jean-Paul ULg

Conference (2014, November 24)

SOLAP (Spatial OnLine Analytical Processing) is a server which allows decision makers to quickly analyze archived data from a spatial datawarehouse. Until now, most of SOLAP tools only manage spatial data ... [more ▼]

SOLAP (Spatial OnLine Analytical Processing) is a server which allows decision makers to quickly analyze archived data from a spatial datawarehouse. Until now, most of SOLAP tools only manage spatial data through the vector mode. However, some visualization techniques use interpolation to transform them into continuous fields in raster mode. Crime hotspot mapping is one of them: data are modeled in raster with a KDE (Kernel Density Estimation) algorithm to offer a spatially continuous visualization of crimes. This research aims at combining hotspot mapping and SOLAP. First, we adapt SOLAP to continuous fields with a raster multidimensional data model. Then the raster model is adapted to KDE. The data model is validated with a prototype including London crime data. [less ▲]

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See detailA capillary Archimedes’ screw
Darbois-Texier, Baptiste ULg; Dorbolo, Stéphane ULg

Conference (2014, November 23)

As used by Egyptians for irrigation and reported by Archimedes, a screw turning inside a hollow pipe can pull out a fluid againt gravity. At a centimetric scale, an analagous system can be found with a ... [more ▼]

As used by Egyptians for irrigation and reported by Archimedes, a screw turning inside a hollow pipe can pull out a fluid againt gravity. At a centimetric scale, an analagous system can be found with a drop pending on a rotating spiral which is tilted toward the horizontal. The ascent of the drop to the top of the spiral is considered and a theoretical model based on geometrical considerations is proposed. The climb of the drop is limited by the fluid deposition on the screw at high capillary number and by a centrifugation phenomenon. We find out the range of fluid proprities and spiral characteristics for which an ascending motion of the drop is possible. Finally we discuss the efficiency of such system to extract a fluid from a bath at a centrimetric scale. [less ▲]

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See detailFoucault et Deleuze et Sami-Ali : postmodernité et psychothérapie.
Englebert, Jérôme ULg

Conference (2014, November 22)

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See detailL'ECMO, Témoignage de deux infirmiers
KOCH, Jean-Noël ULg; BODSON, Sébastien ULg

Conference (2014, November 22)

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See detailSpécificités syntaxiques des types de discours dans les Quatre Livres des Rois (12e s.)
Mazziotta, Nicolas ULg; Glikman, Julie

Conference (2014, November 21)

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See detailOn the finiteness and uniqueness of the weighted likelihood estimator of ability in polytomous IRT models
Magis, David ULg; Verhelst, Norman

Conference (2014, November 21)

In item response theory (IRT), the weighted likelihood (WL) estimator has become a central method to estimate ability levels of respondents. Primarily introduced with dichotomous IRT models (Warm, 1989 ... [more ▼]

In item response theory (IRT), the weighted likelihood (WL) estimator has become a central method to estimate ability levels of respondents. Primarily introduced with dichotomous IRT models (Warm, 1989), it was later extended to polytomous IRT models (Samejima, 1998). However, very few information is available about the behavior of the WL estimator, and especially about the uniqueness of the ability estimates as well as their finiteness. The purpose of this talk is to establish that with polytomous item response models, the WL estimator of ability always returns finite values. This result is valid for the class of difference models and divide-by-total models, independently of the number of items and the response patterns. However, such estimates may not necessarily be unique, as the WL solving equation may provide several optimal values. Some examples are considered to illustrate both findings. [less ▲]

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See detailHow does gender socialisation influence teenagers' behaviors ? : Contribution of ISRD-2 and ISRD-3 to this question
Gavray, Claire ULg

Conference (2014, November 21)

In both gender groups, young people entering the spiral of violence negatively often react against personal insecurity, against a hostile and little promising environment. But those environments still ... [more ▼]

In both gender groups, young people entering the spiral of violence negatively often react against personal insecurity, against a hostile and little promising environment. But those environments still differ between girls and boys according to the sphere which remains the most valorized, 'suitable' for them (public and competitive sphere for the boys, family and emotional sphere for the girls). ISRD data allow to show links between, on one side, the production of not authorized and violent behaviors and, on the other side, gendered concrete life, gendered attitudes and values. The theory of the societal vulnerability (Walgrave, Vettenburg) and the theory of recognition (Honneth) are confirmed. [less ▲]

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See detailOn the Use of Principal Component Analysis for Parameter Identification and Damage Detection in Structures
Golinval, Jean-Claude ULg

Conference (2014, November 20)

Modal analysis is used extensively for understanding the dynamic behaviour of structures as well as for structural health monitoring or damage detection based on output-only measurements. In this ... [more ▼]

Modal analysis is used extensively for understanding the dynamic behaviour of structures as well as for structural health monitoring or damage detection based on output-only measurements. In this presentation, a different approach based on principal component analysis is considered. Principal component analysis (PCA), also called proper orthogonal decomposition (POD), is a multi-variate statistical method that aims at obtaining a compact representation of the data. In the present paper, PCA (POD) is used for three purposes, namely damage detection, structural health monitoring and identification of nonlinear parameters. The key idea of PCA is to reduce a large number of measured data to a much smaller number of uncorrelated variables while retaining as much as possible of the variation in the original data. To this purpose, an orthogonal transformation to the basis of the eigenvectors of the sample covariance matrix is performed, and the data are projected onto the subspace spanned by the eigenvectors corresponding to the largest eigenvalues. This transformation has the property to decorrelate the signal components and to maximize variance. The first problem to which PCA is applied here is the damage detection problem. When applied to vibration measurements, it can be shown that the basis of eigenvectors (called the proper orthogonal modes) span the same subspace as the mode-shape vectors of the monitored structure. Thus the damage detection problem may be solved using the concept of subspace angle between a reference subspace spanned by the eigenvectors of the initial (undamaged) structure and the subspace spanned by the eigenvectors of the current (possibly damaged) structure. The second problem concerns structural health monitoring of civil engineering structures when environmental effects (e.g. the influence of the variation of the ambient temperature) have to be removed from the structural changes. In this case, PCA may be applied on identified modal features (e.g. the natural frequencies) to separate the changes due to environmental variations from the changes due to damage sources. This procedure is illustrated on the example of a real bridge located in Luxembourg. The third problem is related to the estimation of nonlinear parameters using model updating techniques. In this case, the most interesting property of PCA is that it minimizes the average squared distance between the original signal and its reduced linear representation. When applied to nonlinear problems, PCA gives the optimal approximating linear manifold in the configuration space represented by the data. The linear nature of the method is appealing because the theory of linear operators is still available. However, it should be borne in mind that it also exhibits its major limitation when the data lie on a nonlinear manifold. [less ▲]

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See detailSolar Wind Interaction with the Magnetosphere of Jupiter : Impact on the Magnetopause and the Aurorae
Bonfond, Bertrand ULg; Grodent, Denis ULg; Gérard, Jean-Claude ULg et al

Conference (2014, November 20)

The outcome of the interaction between the solar wind and the Jovian magnetic field bears many differences compared to the Earth's case. At Earth, the solar wind is the major particle and energy source in ... [more ▼]

The outcome of the interaction between the solar wind and the Jovian magnetic field bears many differences compared to the Earth's case. At Earth, the solar wind is the major particle and energy source in the magnetosphere. At Jupiter, the tremendous volcanism on the moon Io is the main plasma source and Jupiter's rapid rotation (relative to its size) is the main energy source for the particles populating its magnetosphere. Combined with a weaker solar wind pressure and a larger Alfvén Mach number as the distance from the Sun increases, all these parameters modify the relative importance of large scale Dungey reconnection and viscous interaction at the magnetopause. In order to study these differences, here we present a statistical analysis of magnetopause waves and flux tube event on the Jovian magnetopause, based on in-situ measurement from the spacecraft that flew-by or orbited around Jupiter. Moreover, variations of the solar wind have significant impact on the Jovian magnetospheric current systems and such changes reflect on the aurora. In this presentation, we will also review the recent findings concerning the aurora at Jupiter and their relationship with the solar wind. [less ▲]

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See detailTraitements conservateurs de la gonarthrose
Kaux, Jean-François ULg

Conference (2014, November 20)

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See detailA Debate on Responsible Research and Innovation
Van Oudheusden, Michiel ULg

Conference (2014, November 20)

In the space of just a few years the concept of Responsible Research and Innovation (RRI), or in Dutch Maatschappelijk verantwoord innoveren (MVI), has gained considerable ground: NWO has an MVI-program ... [more ▼]

In the space of just a few years the concept of Responsible Research and Innovation (RRI), or in Dutch Maatschappelijk verantwoord innoveren (MVI), has gained considerable ground: NWO has an MVI-program that has so far funded three rounds of research proposals; Horizon 2020 regularly refers to RRI; and there is now a new journal devoted to RRI. In this panel we focus on the following questions: • How could the concept become so popular in such a relatively short time? • What, if anything, is new in RRI, when we compare it to e.g. CTA, participatory TA, Public Engagement, etc? • If we want to make research and innovation more responsible and responsive to society’s needs, what are the opportunities and obstacles? • What are the conditions for successful mainstreaming of RRI? Panel members Frank Kupper (Athena Institute) Hub Zwart (Centre for Society and the Life Scences), Michiel van Oudheusden (author of a dissertation on Flemish RRI initiatives), and Tsjalling Swierstra (co-founder of the Journal for RI) share their thoughts with colleagues in the audience. [less ▲]

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See detailBoolean Functions for Classification: Logical Analysis of Data
Crama, Yves ULg

Conference (2014, November 20)

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See detailThe physical education teacher as a physical activity promoter: Current developments
Cloes, Marc ULg

Conference (2014, November 19)

The physical education teacher is considered as a cornerstone of the physical activity promotion in the schools. This presentation proposes answers to three questions: (1) Why to promote physical activity ... [more ▼]

The physical education teacher is considered as a cornerstone of the physical activity promotion in the schools. This presentation proposes answers to three questions: (1) Why to promote physical activity at school? (2) Why the PE teacher should play a central role? (3) How the PE teacher could play such role? In conclusion, it is important to remember that (1) PE teachers should become the cornerstones of the PA promotion at school; (2) They have to be involved in PE as well as in the other dimension of PA at school; (3) They have to collaborate (they are not alone), and; (4) Pre service and inservice PETE has to be adapted to show the way and change the mentalities [less ▲]

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See detailSpatial Analysis of GNSS Measurements from an Equatorial Ionospheric Scintillation Monitoring Receiver (ISMR) Network
Lonchay, Matthieu ULg; Wautelet, Gilles ULg; Cornet, Yves ULg et al

Conference (2014, November 19)

The ionosphere has always been a major limitation for GNSS positioning applications. Free electrons in the ionosphere perturb the propagation of GNSS radio signals involving both refraction and ... [more ▼]

The ionosphere has always been a major limitation for GNSS positioning applications. Free electrons in the ionosphere perturb the propagation of GNSS radio signals involving both refraction and diffraction effects. In particular, small-scale ionospheric irregularities generated by different physical processes may cause scattering effects on GNSS signals, producing rapid fluctuations of the signal phase and amplitude as a result. Such scintillations of GNSS signals are responsible for critical consequences regarding applications, such as precise positioning, due to many resulting effects: cycle slips, signal power fading, receiver loss of lock and poor resulting satellite geometry. Ionospheric Scintillation Monitoring Receivers collect high-rate GNSS data. Specific scintillation parameters, such as the well-known S4 and Phi60 indices, are built on high-rate measurements performed on GNSS signals and provide additional information to characterize the intensity of such an event occurring at a specific geographic location at a given time. Spatial Statistics belong to the field of Spatial Analysis, Geography and GIS (Geographic Information System). This discipline allows to perform analyses of data which are localised in space. Ionospheric Scintillation observations achieved by ISMR stations can be characterized by a set of attributes (S4, Phi60, Rate of TEC, etc.) including also the geographic location of their respective Ionospheric Pierce Point (IPP). By combining the simultaneous Multi-GNSS ISMR measurements from a network of ISMR stations, we can obtain a spatially denser data set, able to support spatial statistics tests. The idea of our research is to provide a spatio-temporal analysis of ionospheric scintillation events over Equatorial regions by applying spatial statistics on ISMR Multi-GNSS measurements. In particular, by using spatial statistics, we aim to resolve specific issues regarding ionospheric scintillation data from an ISMR network established in Brazil. The research consists in spatially describing the data set, detecting and measuring potential spatial autocorrelation, determining the scale of the spatial dependency and finally producing an interpolated scintillation sky map at a given time. In terms of applicability of the methodology, our research project consists in exploiting the spatio-temporal analysis performed on ionospheric scintillation data in order to improve the performances and the reliability of Absolute GNSS Positioning algorithms under moderate ionospheric scintillation conditions. By assessing correlations existing between specific ISMR data and classic GNSS observations, the method could be extended to a more general usage which would be independent of ISMR measurements. [less ▲]

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See detailGravitational lensing search for dark matter halos
Biernaux, Judith ULg

Conference (2014, November 19)

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See detailDo we need dark matter in cosmology?
Magain, Pierre ULg; Hauret, Clémentine ULg

Conference (2014, November 19)

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See detailPlate-forme interactive au service des grandes populations d’étudiants suivant un cours de Physique
Marique, Pierre-Xavier ULg; Hoebeke, Maryse ULg

Conference (2014, November 18)

La réforme des études de médecine introduite en 2012 en Communauté Française (Belgique) a fortement modifié les programmes de cours, entre autres celui de physique, pour lequel certaines notions sont ... [more ▼]

La réforme des études de médecine introduite en 2012 en Communauté Française (Belgique) a fortement modifié les programmes de cours, entre autres celui de physique, pour lequel certaines notions sont désormais considérées comme prérequises. Conscientes que celles-ci ne sont pas toujours acquises par les étudiants, les équipes pédagogiques de l'ULg ont élaboré des systèmes de remédiation. Un espace en ligne a notamment été développé, parallèlement au cours présentiel, afin de permettre aux enseignants et aux étudiants d'évaluer les difficultés et lacunes de ces derniers et d’y remédier. Cet outil est conçu pour offrir une aide spécifique adaptée à chacun malgré le nombre important d’étudiants inscrits (800 en 2013). Ils peuvent y travailler, de manière progressive et autonome, les aspects théoriques (notes et tests formatifs) et pratiques (exercices, problèmes décomposés ou non). Des tests diagnostiques en début et fin de parcours permettent aux apprenants d’apprécier leur évolution. De plus, la plate-forme centralise différents outils interactifs (forums, calendrier, annonces, …) accompagnant l’étudiant dans l’organisation de son parcours. Les premières analyses de traces indiquent une corrélation entre travail en ligne et réussite. Une adaptation progressive de l’outil sera basée sur l’analyse des résultats et du ressenti de étudiants. [less ▲]

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See detailLes changements sociétaux sont-ils promoteurs de bien-être au travail ?
Mairiaux, Philippe ULg

Conference (2014, November 17)

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See detailBorréliose: mythe ou réalité ?
Amory, Hélène ULg; Houben, Rosa ULg; Pitel, Pierre Hugues et al

Conference (2014, November 15)

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See detail"Preußisch-deutsch" und "wallonisch". Zur Identitätsproblematik der Malmedyer Wallonie im Ersten Weltkrieg
Brüll, Christoph ULg

Conference (2014, November 15)

Durch die Artikel 32-34 des Versailler Vertrags wurden die beiden deutschen Grenzkreise Eupen und Malmedy nach einer umstrittenen Volksbefragung im Jahr 1920 Belgien zugeschlagen. Dabei wies der Kreis ... [more ▼]

Durch die Artikel 32-34 des Versailler Vertrags wurden die beiden deutschen Grenzkreise Eupen und Malmedy nach einer umstrittenen Volksbefragung im Jahr 1920 Belgien zugeschlagen. Dabei wies der Kreis Malmedy eine Besonderheit auf: er war zwei- bzw. dreisprachig Deutsch-Wallonisch-Französisch. Tatsächlich waren rund 10.000 Wallonen seit den Entscheidungen des Wiener Kongresses von 1815 Bürger Preußens und später des Kaiserreichs gewesen. Der Beitrag fragt nach ihrer Identität im Kaiserreich, wo sie zu Kollateralopfern der gegen größere Minderheiten gerichteten Germanisierungspolitik wurden, woraus ein wallonischer Kulturpartikularismus an der deutsch-belgischen Grenze resultierte. Dabei wird auch deren Offenheit während des langen 19. Jahrhunderts deutlich, die durch intensive grenzüberschreitende soziale, wirtschaftliche und auch kulturelle Kontakte gekennzeichnet ist. Der Beginn des Ersten Weltkriegs wurde deshalb als umso dramatischer empfunden. Die Haltung der Bevölkerung in der so genannten Preußischen Wallonie während des Kriegs ist jedoch bisher von der Forschung kaum in den Blick genommen worden. Deutlich lässt sich jedoch der Einfluss eines sich nunmehr erheblich beschleunigenden Nationalisierungsprozesses an der Grenze zum besetzten Belgien ausmachen. Auf der Grundlage der im Staatsarchiv Eupen erhaltenen Bestände des Kreisarchivs Malmedy im Kreis sollen die Auswirkungen des Krieges auf die kleinste Minderheit im Westen dargestellt werden. Gefragt werden soll nach Misstrauensbekundungen „von oben“, nach potentiellen Loyalitätskonflikten, z.B. in Form von Desertionen, ggf. nach Nachkriegsvorstellungen der Betroffenen und nach einem Wandel von Zugehörigkeitsgefühlen. Besonderes Augenmerk wird dabei auf jene (überaus seltenen) Akteure gelegt, die schon vor 1914 einen Anschluss des Gebietes an Belgien gefordert hatten und die sich der besonderen Aufmerksamkeit der preußischen Behörden gewiss sein konnten. Kaum zu überschätzen ist auch die Bedeutung der Pfarrer, die in einer als streng katholisch geltenden Region erheblichen Einfluss auf das politisch-gesellschaftliche Leben und – selbstverständlich – auf die Trauerarbeit für gefallene Soldaten (deren Zahl sich auf einige Hundert beläuft) nahmen. Nicht zuletzt stellt sich die Frage nach der Erfahrung des Kriegsendes und der darauf folgenden Besatzungszeit durch britische Truppen, die im August 1919 von belgischen Soldaten abgelöst wurden. Diese Fragen sind bisher, so sie denn überhaupt gestellt worden sind, zumeist aus der Perspektive des Staatenwechsels von 1920 beantwortet worden. Der Kampf einiger Akteure für die Behauptung einer wallonischen Identität innerhalb des Kaiserreichs wurde in der belgisch-nationalen Historiographie zu einem Kampf für die Eingliederung durch Belgien umgedeutet, die Zugehörigkeit zu Preußen zum dark age der lokalen Vergangenheit erklärt – wobei die Zugehörigkeit zur französisch-wallonischen Sprachgemeinschaft hier eine andere Ausgangslage schaffte als für ebenfalls an Belgien abgetretenen deutschsprachigen Gemeinden um die Städte Eupen und St. Vith. Diese Narrative entfalteten ihre durchschlagende Wirkung jedoch erst nach dem Zweiten Weltkrieg und der 1940 erfolgten Wiedereingliederung Eupen-Malmedys durch das „Großdeutsche Reich“. Der Beitrag unternimmt den Versuch, die Entwicklung der Jahre 1914-1920 nicht von ihrem Ende her zu betrachten, wobei der – bisher vernachlässigten – erfahrungsgeschichtlichen Perspektive besondere Bedeutung zukommt. Insofern zielt er ebenfalls darauf ab, die Grenzgeschichte aus der Zentrum-Peripherie-Perspektive zu lösen und – auch sehr kleine – Grenzregionen als Akteur (und nicht als bloßes Objekt) zu fassen. [less ▲]

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See detailRé-créations familiales entre ruptures, pertes et nouvelles appartenances
D'Amore, Salvatore ULg

Conference (2014, November 14)

Les familles recomposées font face à de multiples transitions.Au cœur de ces transitions, différents processus de redéfinition interactionnelle et mythique sont attendus. Parmi ceux-ci, la construction ... [more ▼]

Les familles recomposées font face à de multiples transitions.Au cœur de ces transitions, différents processus de redéfinition interactionnelle et mythique sont attendus. Parmi ceux-ci, la construction des nouvelles appartenances qui prévoit la gestion des ruptures ainsi que la construction de nouveaux repères affectifs et sociaux. Dans la pratique psychothérapeutique, nous rencontrons souvent des couples et des familles qui ont « mal » aux transitions et qui se proposent comme « suspendues » entre un passé non reproductible et un futur imperceptible. A travers des situations cliniques et de recherche avec des familles recomposées, l’intervention portera sur l’intérêt d’aborder ces transitions complexes à travers le concept de perte ambiguë. Ce travail prévoit, non pas tant une élaboration définitive des précédentes appartenances mais bien une co-création de ponts affectifs entre le passé et le présent, l’écriture de nouveaux scripts pour le futur ainsi que la gestion d’appartenances multiples et ce, également à travers la re-dynamisation de ressources et de potentialités évolutives chez les couples, familles et leurs réseaux. [less ▲]

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See detailRé-Créations Familiales: ruptures, pertes et nouvelles appartenances
D'Amore, Salvatore ULg

Conference (2014, November 14)

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See detailLe rôle de l'altérité dans la conscience malheureuse hégélienne
Petteni, Oriane ULg

Conference (2014, November 14)

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See detailElectrical modelling of interface traps in GeSn MOS structures
Baert, Bruno ULg; Cerica, Delphine; Schmeits, Marcel ULg et al

Conference (2014, November 13)

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See detailL’impact de la gestion des obstacles à la libre circulation des poissons
Ovidio, Michaël ULg

Conference (2014, November 13)

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See detailSanté mentale et travail - les enjeux sociétaux
Mairiaux, Philippe ULg

Conference (2014, November 13)

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See detailApproche électro-physiologique non invasive des malformations du développement cortical: EEG
RIKIR, Estelle ULg

Conference (2014, November 13)

L’électro-encéphalogramme (EEG) de surface, technique non invasive et peu couteuse, demeure la pierre angulaire de la mise au point des épilepsies. Le développement de dispositifs d’enregistrement au ... [more ▼]

L’électro-encéphalogramme (EEG) de surface, technique non invasive et peu couteuse, demeure la pierre angulaire de la mise au point des épilepsies. Le développement de dispositifs d’enregistrement au moyen de 64 à 256 électrodes a permis d’augmenter considérablement la résolution spatiale de l’EEG de surface (Lantz et al., Clin Neurophysiol 2003). D’autre part, le développement de l’imagerie de source électrique (ISE) a permis au moyen de modèles mathématiques de localiser le générateur cortical responsable du signal EEG enregistré en surface (Scherg et al., 1990; Pascual-Marqui, 2002). Les malformations corticales (MCs) représentent un large spectre d’anomalies structurelles congénitales (Barkovich et al., Brain 2012) et constituent une des principales causes d’épilepsie de l’adulte (Spencer & Huh, Lancet Neurol 2008). Cette épilepsie s’avère malheureusement pharmaco-résistante dans la plupart des cas (85%) (Papayannis et al., Seizure 2012). Si les MCs sont hétérogènes d’un point de vue structurel (radiologique et anatomopathologique), les études électro-physiologiques (EEG) ont démontré que cette hétérogénéité existait également au niveau fonctionnel, non seulement entre les différents types de MCs mais aussi parfois au sein d’une même malformation. Les dysplasies corticales focales (DCF), hautement épileptogènes (Chassoux et al., Brain 2000; Aubert et al., Brain 2009), restent « invisibles » à l’IRM dans 30 à 50 % des cas (Hauptman et al., Epilepsia 2012). Dans ce cas, l’EEG de surface et l’ISE aident à la localisation du foyer épileptique (Brodbeck et al., Epilepsia 2010; Rikir et al.,Epilepsia 2014). Morphologiquement, aucune anomalie en EEG de surface n’est spécifique d’une DCF (Sisodiya et al., Lancet Neurol 2009). Les MCs, notamment les schizencéphalies et polymicrogyries, sont parfois très vastes et impliquent structurellement plusieurs régions lobaires et sous-lobaires, compliquant l’approche chirurgicale. L’EEG haute résolution couplé à l’ISE peut montrer le caractère hétérogène de la malformation en terme d’épilpetogénicité et désigner ainsi la partie impliquée dans les crises d’épilepsie (Rikir et al., 2014 ; Maillard et al., 2009). En cas de malformation multifocale (sclérose tubéreuse de Bourneville, hétérotopies nodulaires), les anomalies EEG critiques et inter-critiques désignent parfois une origine unifocale des crises épileptiques rendant éventuellement possible un traitement chirurgical. Enfin, il a été montré prospectivement que l’EEG haute densité couplé à l’ISE contribuait à localiser la zone épileptogène dans les épilepsies en rapport les MCs , qu’il présentait une valeur ajoutée par rapport à une mise au point classique basée sur l’enregistrement VIDEOEEG et l’IRM cérébrale, et qu’il était particulièrement indiqué en cas d’IRM négative ainsi qu’en cas de discordance entre hypothèses électro-cliniques (VIDEOEEG) et données structurelles (IRM) (Rikir et al., Epilepisa 2014). [less ▲]

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See detailSmart cross-linked polymer micelles for drug delivery
Riva, Raphaël ULg; Vanslambrouck, Stéphanie ULg; Ergül, Zeynep ULg et al

Conference (2014, November 11)

Nowadays, polymer crosslinking is widely used in industry to improve or to impart new properties to existing polymer material. In the pharmaceutical field, polymer crosslinking is of great interest for ... [more ▼]

Nowadays, polymer crosslinking is widely used in industry to improve or to impart new properties to existing polymer material. In the pharmaceutical field, polymer crosslinking is of great interest for the elaboration of drug delivery devices, mostly hydrogels. Nevertheless, crosslinking is also very useful in nanovectorization of active principle. Indeed, each day, new drugs are synthesized and available on the market but in too many cases, the high hydrophobicity of some drugs makes them useless because of the absence of an appropriated administration method. The encapsulation of the drug into a nanocarrier, typically in the hydrophobic core of a polymer micelle, allows a significant increase of the drugs concentration in water in addition to the protection of the active principle against degradation. However, polymer micelles suffer of the main drawback to not be stable, leading to a premature release of the drug, when the concentration falls down the critical micellar concentration (CMC), which it is rapidly observed after intravenous injection. In order to get rid of the CMC, crosslinking of the micelle core is the most proposed strategy. Nevertheless, the crosslinking of the micelle core may have a non-negligible effect on the drug loading but mainly on the drug release due to the sequestration of the drug in the network. Over the last years, our lab investigated several strategies for the crosslinking of the micelle core made of amphiphilic and biocompatible block copolymers generally by UV radiation in order to fulfill the increasingly stringent requirements of biomedical applications. These strategies are very helpful to prepare injectable nanosized cross-linked particles loaded with an active particle. For some systems, the effect of the crosslinking rate on the drug loading and the drug release was evaluated using a model drug. As the crosslinking may interfere with the drug release after internalization of the carrier into the cell, a reversible crosslinking of the micelle core was proposed. Typically, the introduction of disulfide bond as inter-chain links allowed to delay the drug release by diffusion whereas into the cell, the reduction of the disulfide bridges into corresponding thiol led to the fast disassemble of the micelle and the specific release of the drug into cytoplasm. [less ▲]

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See detailPratiques et stratégies alimentaires dans l'Antiquité tardive : l'apport de la papyrologie
Marganne, Marie-Hélène ULg

Conference (2014, November 10)

Sans équivalent dans le monde antique et tardo-antique en raison des conditions climatiques favorables de l’Égypte, les sources papyrologiques, qu'elles soient littéraires, documentaires, magiques ou ... [more ▼]

Sans équivalent dans le monde antique et tardo-antique en raison des conditions climatiques favorables de l’Égypte, les sources papyrologiques, qu'elles soient littéraires, documentaires, magiques ou chrétiennes, écrites en grec, en latin ou même en copte, fournissent de nombreuses informations sur les denrées alimentaires, non seulement produites et importées dans le Pays du Nil durant la période byzantine (à partir de l'accession au principat de Dioclétien, en 284, jusqu'à la conquête arabe, en 641), mais également exportées et consommées dans le reste de l'Empire romain et dans d’autres contrées, ainsi que sur la manière de les utiliser. Après avoir inventorié les papyrus contenant des références à des produits alimentaires, leur genre, leur provenance, leur forme, leur langue et leur écriture, à l'aide de quelques exemples, on s’interrogera sur leur contenu et sur ce qu’il révèle des pratiques et stratégies alimentaires d’une société multiculturelle (Égyptiens, Grecs, Romains, Juifs, etc.) depuis l’époque hellénistique, de l’internationalisation et de l’intensification des relations commerciales sous l’Empire romain, sans oublier l’influence des préceptes religieux. [less ▲]

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See detailThe Airline Container Loading Problem with Pickup and Delivery
Lurkin, Virginie ULg; Schyns, Michael ULg

Conference (2014, November 09)

We address the problem of allocating containers into predefined positions of a carrier, in this case aircraft, under several realistic structural and safety constraints. The originality of our approach is ... [more ▼]

We address the problem of allocating containers into predefined positions of a carrier, in this case aircraft, under several realistic structural and safety constraints. The originality of our approach is to allow multi-trips with pickup and delivery at some intermediate locations. The objective is to minimize the economic and environmental costs including the impact of the intermediate operations. We resort to an integer linear model. Numerical experiments have been performed using a standard B\&C library. Heuristics are developed to speed up the process. [less ▲]

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See detail« Roman policier métaphysique et récit de l’échec »
Dechene, Antoine ULg

Conference (2014, November 09)

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See detailRetrievals of formaldehyde from ground-based FTIR and MAX-DOAS observations at the Jungfraujoch station and comparisons with GEOS-Chem and IMAGES model simulations
Franco, Bruno ULg; Hendrick, François; Van Roozendael, Michel et al

Conference (2014, November 07)

As a ubiquitous product of the oxidation of many Volatile Organic Compounds (VOCs), formaldehyde (HCHO) plays a key role as a short-lived and reactive intermediate in the atmospheric photo-oxidation ... [more ▼]

As a ubiquitous product of the oxidation of many Volatile Organic Compounds (VOCs), formaldehyde (HCHO) plays a key role as a short-lived and reactive intermediate in the atmospheric photo-oxidation pathways leading to the formation of tropospheric ozone and secondary organic aerosols. We have successfully retrieved HCHO columns from ground-based Fourier Transform Infrared (FTIR) solar spectra and UV-Visible Multi-AXis Differential Optical Absorption Spectroscopy (MAX-DOAS) scans recorded during the July 2010 – December 2012 time period at the Jungfraujoch station (Swiss Alps, 46.5 °N, 8.0 °E, 3580 m a.s.l.). Characterization of the retrieved products has revealed different vertical sensitivity between both remote sensing techniques. Furthermore, HCHO amounts simulated by two state-of-the-art Chemical Transport Models (CTMs), GEOS-Chem and IMAGESv2, have been compared to FTIR total columns and MAX-DOAS 3.6 – 8 km partial columns, accounting for the respective vertical resolution of each ground-based instrument. Using the CTMs outputs as intermediate, FTIR and MAX-DOAS retrievals have shown consistent seasonal modulations of HCHO throughout the investigated period, characterized by summertime maximum and wintertime minimum. Such comparisons have also highlighted that FTIR and MAX-DOAS provide complementary products for HCHO above the Jungfraujoch station. [less ▲]

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See detailLes lettres des tirailleurs rwandais
Singiza, Dantès ULg

Conference (2014, November 07)

Detailed reference viewed: 16 (1 ULg)
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See detailDe la sociologie de la littérature à une sociologie par la littérature
Ledent, David ULg

Conference (2014, November 07)

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See detailForest inventory with Terrestrial LiDAR: what about Hand-Held Mobile LiDAR?
Bauwens, Sébastien ULg; Bartholomeus, Harm; Piboule, Alexandre et al

Conference (2014, November 05)

For a decade, studies of the application of static Terrestrial Laser Scanner (TLS) in plotwise forest inventories are giving more and more effective results. In spite of the improvements occurring in ... [more ▼]

For a decade, studies of the application of static Terrestrial Laser Scanner (TLS) in plotwise forest inventories are giving more and more effective results. In spite of the improvements occurring in processing scan data to extract forest attributes, the occlusion effect is still limiting the processing efficiency. A multi-scan approach is recommended to reduce this effect. However, such approach needs pre-scan preparations (setting up the plot, targets positioning), it requires data registration and it comes at a higher data collection cost. In this study we explore the potential of a Hand-held mobile LiDAR System (HMLS) as new LiDAR tool to scan forest plots. HMLS data are compared to static TLS data (single and multi-scan) in terms of data acquisition, registration time and quality of automatic DBH extraction. The low weight, small size of the instrument and no targets requirements reduce the time of pre-scan preparations to the time needed for single scan which is 6 times less than scanning a plot with 5 scans. The registration time depends of the time spent to scan the plot and it is of the same magnitude than single scan. The resulting point cloud of the HMLS is noisier than TLS point clouds. Nevertheless, error on DBH estimations is similar to scanning a plot with a TLS positioned at 5 locations. RMSE is higher than multi-scan and close to single scan for trees detected by the both LiDAR technologies. This first study exhibits the high potential of HMLS by its simple use, which needs only one operator while presenting similar results in automatic DBH extraction than static TLS. Technology and registering method improvements of this type of mobile LiDAR will reduce the noise of the point cloud, which might reduce the DBH RMSE. [less ▲]

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See detailPollution and Siltation of Rivers in the Western Highlands of Cameroon: a Consequence of Farmland Erosion by Runoff
Djoukeng, Henri Grisseur ULg; Tankou, Christopher Mubeteneh; Degré, Aurore ULg

Conference (2014, November 05)

In the western highlands agro-ecological zone of Cameroon, rivers are constantly silted and polluted with waste from cultivated plots. This study investigated on the characterization and quantification of ... [more ▼]

In the western highlands agro-ecological zone of Cameroon, rivers are constantly silted and polluted with waste from cultivated plots. This study investigated on the characterization and quantification of sediment from plots cultivated in the watershed Méloh; among these sediment we highlighted soil, plant residues, chemical packages and plastic casing used for irrigation. In a natural rocky bottom wells, we performed for a period of three years the collection, differentiation and measurement of trapped sediment in the cultivated part of river that runs through the watershed. The total cultivated area is about 7.5 ha; slopes are operated between 14% and 17%. During the years 2012 and 2013 where farmers practiced both flatbed and ridging along the steepest slope, two methods of land preparation that do not contribute positively to water conservation, we collected an average of 10.429 t.ha-1. During the 2013 crop year, with the participation of curious farmers we experimented tied ridging in a potato; this technique was adopted on 75% of plots in 2014 and we collected 3.586 t.ha-1, a decrease of 65.61% compared to the average of previous years. This study showed that traditional agricultural practices are a cause of siltation and pollution of the Méloh river, thus almost all rivers in the study area by what the topography is similar and agriculture the main activity. Tied ridging significantly reduced siltation of rivers; it is thus an effective technique to fight against water pollution in mountain agriculture. [less ▲]

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See detailÉmissions gazeuses en production porcine
Philippe, François-Xavier ULg

Conference (2014, November 04)

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See detailBiostratigraphic and chemostratigraphic constraints of the Mbuji-Mayi Supergroup (Meso-Neoproterozoic age), Democratic Republic of Congo.
Kabamba Baludikay, Blaise ULg; Bekker, Andrey; Baudet, Daniel et al

Conference (2014, November 03)

The Mbuji-Mayi Supergroup is a sedimentary sequence unaffected by regional metamorphism [1]. It was deposited between 1174 ± 22 Ma and ca. 800 Ma in the intracratonic failed-rift SMLL “Sankuru-Mbuji-Mayi ... [more ▼]

The Mbuji-Mayi Supergroup is a sedimentary sequence unaffected by regional metamorphism [1]. It was deposited between 1174 ± 22 Ma and ca. 800 Ma in the intracratonic failed-rift SMLL “Sankuru-Mbuji-Mayi- Lomami- Lovoy” basin [2] which extends from SE to NW between Katanga and Kasai Provinces. And overlies the Mesoproterozoic Kibaran Belt Supergroup (in the eastern part of SMLL basin) while in the Western part, where we focused our work, it rests unconformably upon Archean Dibaya Granitic Complex [3]. The amygdaloidal basaltic pillow lavas (948 ± 20 Ma) overlie the Mbuji-Mayi Supergroup, at the confluence of Mbuji-Mayi and Sankuru rivers [4]. Lithostratigraphically, this Supergroup consists in two distinct successions: a lower siliciclastic sequence (~500m) of BI Group and an upper carbonatic sequence (~1000m) with stromatolitic build-ups and black shales of BII Group [2]. Our own and previous sedimentological observations [5] indicate facies ranging from subtidal, low-energy stromatolitic environments to overlying intertidal to supratidal evaporitic settings of lagoon and sabkha. Here we present data on microfossil diversity and carbon isotope chemostratigraphy from the Kanshi, Lubi and Kafuku drillholes. The well-preserved and diverse assemblage of acritarchs and filamentous forms includes prokaryotes and eukaryotes, and is similar to other coeval assemblages described worldwide outside of Africa. The presence of the acanthomorph acritarch Trachyhystrichosphaera aimika is significant as it is indicative of the late Meso- to early Neoproterozoic age elsewhere, and is reported for the first time in Central Africa. So far, 56 species belonging to 31 genera were identified, dramatically increasing the previously reported diversity [6, 7]. Chemostratigraphy based on δ13Ccarb values for 290 samples, records, for the BI Group, predominantly negative values down to -8 to -9 ‰ VPDB with few samples having more positive, up to +3 ‰, values. Although the siliciclastics-rich sediments in the lower part of the BI Group likely record early diagenetic signal, carbonates in the upper part of the BI Group show similar patterns in both the Lubi and Kafuku drill cores with the sharp fall from +1 to +3 ‰ values to -8 to -7 ‰ and recovery back to +1 ‰ values over 40 to 70 m of section. The BII Group shows a less dramatic rise from -1 ‰ to +4 to +5 ‰ over more than 150 m of section. These large-scale variations differ from the steady-state carbon cycle of the late Mesoproterozoic [8] and are typical of the early Neoproterozoic record [9]. The project is supported by the EU FP7 ERC Stg ELITE. [less ▲]

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See detailEarly detection of university students in potential difficulty : a case study
Hoffait, Anne-Sophie ULg; Schyns, Michael ULg

Conference (2014, November)

Rate of success in the first year at University in Belgium is very low regarding other foreign universities. The University of Liege, as other Universities, has already taken different initiatives. But by ... [more ▼]

Rate of success in the first year at University in Belgium is very low regarding other foreign universities. The University of Liege, as other Universities, has already taken different initiatives. But by early identifying students who have a high probability to face difficulties if nothing is done, the Universities might develop adapted methods to attack the problem with more emphasis where it is more needed and when it is still possible. Thus we want to develop a decision tool able to identify these students to help them. For that, we consider three standard datamining methods: logistic regression, artificial neural networks and decision trees and focus on early detection, i.e. before starting at the University. Then, we suggest to adapt these three methods as well as the classification framework in order to increase the probability of correct identification of the students. In our approach, we do not restrict the classification to two extreme classes, e.g. failure or success, but we create subcategories for different levels of confidence: high risk of failure, risk of failure, expected success or high probability of success. The algorithms are modified accordingly and to give more weight to the class that really matters. Note that this approach remains valid for any other classification problems for which the focus is on some extreme classes; e.g. fraud detection, credit default... Finally, simulations are conducted to measure the performances of the three methods, with and without the suggested adaptation. We check if the factors of success/failure we can identify are similar to those reported in the literature. We also make a ``what-if sensitivity analysis''. The goal is to measure in more depth the impact of some factors and the impact of some solutions, e.g., a complementary training or a reorientation. [less ▲]

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See detailSpace Weather at Saturn - Auroral observations
Radioti, Aikaterini ULg; Grodent, Denis ULg; Gérard, Jean-Claude ULg et al

Conference (2014, November)

Unlike to Earth, Saturn is a fast rotator and its magnetosphere is dominated by fast planetary rotation and internally driven processes. However, the interaction of the solar wind with Saturn’s ... [more ▼]

Unlike to Earth, Saturn is a fast rotator and its magnetosphere is dominated by fast planetary rotation and internally driven processes. However, the interaction of the solar wind with Saturn’s magnetosphere is not negligible and it is manifested among others in the auroral region. The interplanetary magnetic field reconnects with the dayside magnetopause at Saturn and results in enhancements in the auroral emission accompanied by entry of significant amount of open flux in the magnetosphere. The solar wind affects also the nightside magnetosphere. Dramatic enhancements of the nightside-dawn auroral emissions have been attributed to solar wind-induced auroral storms. Additionally, recent auroral observations revealed the presence of a transpolar arc at Saturn, one of the most spectacular auroral features at Earth, which could be possibly related to solar wind driven tail reconnection. Finally, there is evidence of viscous interaction of the solar wind with Saturn’s magnetosphere, which involves magnetic reconnection on a small scale. [less ▲]

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See detailEcomorfologia y evolucion del sistema locomotor de la familia Pomacentridae
Aguilar-Medrano, Rosalia; Frederich, Bruno ULg; Barber, Paul

Conference (2014, November)

Due their productivity, structural diversity, and potential to promote ecological, functional and morphological evolution, coral reefs have the highest species richness of fishes. As swimming is the ... [more ▼]

Due their productivity, structural diversity, and potential to promote ecological, functional and morphological evolution, coral reefs have the highest species richness of fishes. As swimming is the primary form of locomotion and interaction their aquatic environment, small morphological variations can have profound implications on the fitness of fishes. The damselfish family, Pomacentridae, has inhabited coral reef ecosystems for more than 50 million years. As such, habitat preferences and behavior could significantly contribute to the evolution of the morphology of damselfish through the impacts of shape on locomotion. To test this hypothesis, we employed comparative morphometric analyses of fish shape and ecology. While body elongation represented the primary source of variation in locomotor system shape, results also showed a diverse suit of morphological combinations in between the morphological extremes. Results showed strong associations between behavior and habitat preferences, suggesting that behavior may constrain the shape of the locomotor system in damselfishes. Position in the water column show relation with the cephalic region and truck, behavior is related to the cephalic angle and the angle of insertion of the pectoral fin, while maximum depth is related to the caudal peduncle. Was found little relation between the caudal peduncle, the angle of pectoral fin attachment and the rest modules, therefore, this two modules may be the main responsible of swimming fitness in damselfishes. Finally, cephalic region is highly related to most modules, especially to trunk. This strong integration may be responsible of the limit morphological variation of damselfishes. [less ▲]

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See detail« La médiation, une justice de seconde zone ? Les modes alternatifs de résolution des conflits, le droit et l’héritage à Cotonou »
Andreetta, Sophie ULg

Conference (2014, November)

Dans la plupart des familles de Cotonou, l’héritage est source de conflits. Qu’il s’agisse de frères et sœurs et de la gestion du patrimoine commun, d’un administrateur qui accapare l’ensemble des ... [more ▼]

Dans la plupart des familles de Cotonou, l’héritage est source de conflits. Qu’il s’agisse de frères et sœurs et de la gestion du patrimoine commun, d’un administrateur qui accapare l’ensemble des ressources, d’une veuve chassée par les enfants de ses coépouses, chaque famille fait l’objet d’une anecdote, de tensions latentes ou de conflits ouverts. Si certains n’hésitent pas à saisir les tribunaux, la justice constitue la plupart du temps le dernier recours. En cas de désaccord, quelles sont les démarches entreprises avant le tribunal? Il existe une série d’instances de médiation en matière familiale, depuis les sages de la famille ou du village, jusqu’aux tribunaux de conciliation ou aux ONG d’assistance juridique. Comment les héritiers choisissent-ils le forum auquel s’adresser ? Je m’intéresserai également au fonctionnement de ces institutions parajudiciaires, à la manière dont le droit y est mobilisé, dont les conflits y sont résolus ou renvoyés vers les tribunaux. [less ▲]

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See detailLes stratégies industrielles de valorisation de la biomasse végétale en Région Wallonne
Richel, Aurore ULg

Conference (2014, November)

Cet exposé décrit les stratégies industrielles de valorisation des matières premières végétales en Région Wallonne et les différences par rapport aux modèles européens et internationaux existants. Les ... [more ▼]

Cet exposé décrit les stratégies industrielles de valorisation des matières premières végétales en Région Wallonne et les différences par rapport aux modèles européens et internationaux existants. Les matières premières disponibles pour le bioraffinage de 1ère et 2ème générations sont listées sur base des données accumulées par les équipes de Gembloux Agro-Bio Tech. Les avantages et limitations de ces matières premières sont décrits. Les technologies de conversion commercialisables sont proposées en fonction des contraintes socio-économiques de la Wallonie: bioraffineries autonomes, intégrées, etc. Divers exemples de réalisations commerciales ou en prototypes sont proposés, de même que certains projets de R&D dans ce domaine. [less ▲]

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See detailConnexion universelle et enveloppement du futur dans le présent
Bouquiaux, Laurence ULg

Conference (2014, November)

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See detailBacillus as a source of novel antibiotics
Fickers, Patrick ULg

Conference (2014, November)

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See detailPropuesta de estrategia para la producción de biocombustibles de biomasa lignocelulósica
Ramos-Sanchez, L.B.; Cujilema-Quitio, M.C.; Leon-Revelo, G. et al

Conference (2014, November)

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See detailBash Tapa (Iraq). The Pottery from the First Excavation Campaign
Mas, Juliette ULg

Conference (2014, November)

Bash Tapa is a circa 8 ha settlement, located 35 km South of Erbil, in Iraqi Kurdistan. Its exploration was began in September 2013 by a french archaeological mission, led by L. Marti (CNRS, Paris). When ... [more ▼]

Bash Tapa is a circa 8 ha settlement, located 35 km South of Erbil, in Iraqi Kurdistan. Its exploration was began in September 2013 by a french archaeological mission, led by L. Marti (CNRS, Paris). When the sounding carried out on the top of the site allowed us to explore middle-assyrian levels, the stratigraphical step trench excavated on the southern slope of the tell revealed six phases of occupation dating to the 3rd millennium BC, from the Ninevite 5 to the Early Dynastic III periods. A first evaluation of the pottery material recovered in this operation revealed that there are different traditions represented at the site. In fact, while the material dated from the beginning of the Early Bronze Age is clearly related to the Northern tradition, the most recent 3rd millennium levels identified so far have provided us with pottery which could be connected to Central Mesopotamia, and more specifically to the Diyala region. This paper will give a first overview of the pottery from the first campaign of excavation at Bash Tapa, mainly focusing on 3rd millennium material, its links with the other regions of Near East and its significance for chronology. [less ▲]

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See detailStress and singing accuracy: What is the relationship?
Larrouy, Pauline ULg

Conference (2014, October 31)

Singing in public can be stressful and stress affects the control of the fundamental frequency, i.e. a critical element to control in order to sing in tune. It seems thus clear that singing in public will ... [more ▼]

Singing in public can be stressful and stress affects the control of the fundamental frequency, i.e. a critical element to control in order to sing in tune. It seems thus clear that singing in public will have an influence on vocal accuracy. In addition, the quality of a musical performance can be lessened or enhanced if the performer experiences stressful conditions. In order to clarify the effects of stress on singing accuracy and to explore solutions to favor the positive consequences of stress, we ran an experiment in collaboration with the Royal Conservatory of Liège. Thirty-one music students were asked to learn a simple melody. There were then recorded in a stressful condition (i.e., a music examination) and a non-stressful condition. Two groups were defined according to the challenge level of the music examination (first and second music levels). Measurements were made by self-reported state anxiety (CSAI-2R questionnaire) and by observing heart rate activity (electrocardiogram) during each performance. In addition, the vocal accuracy of the sung performances (in terms of respect of melodic contour, precision of intervals and respect of the tonality) was objectively analyzed. As expected, state anxiety and heart rate were significantly higher on the day of the music examination than in the non-stressful condition for all the music students. However, the effect of stress was positive for the first-year students but negative for the second-year students, for whom the music examination was particularly challenging. In addition, highly significant correlations were found between the intensity of cognitive symptoms and the vocal accuracy criteria. This study highlights the contrasting effects of stress on singing voice accuracy. The results encourage searchers to take into account the stress level of the performer when evaluating singing accuracy. In addition, it seems pertinent to work on the perception of somatic and cognitive symptoms in higher music institutions and to try to diminish the stress level of students, in order to favor the positive consequences of stress on the quality of musical performances. Thanks to this method, we are actually focusing on studies designed to better understand the effects of stress on speaking voice. [less ▲]

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See detailInjections de PRP et tendinopathies
Kaux, Jean-François ULg

Conference (2014, October 30)

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See detailMigration in Extreme Climate Scenarios
Zickgraf, Caroline ULg

Conference (2014, October 29)

Detailed reference viewed: 13 (2 ULg)
Peer Reviewed
See detailBetween dialect and idiolect in Deir el-Medineh
Winand, Jean ULg

Conference (2014, October 29)

Detailed reference viewed: 12 (1 ULg)
See detailRevealed preference tests of collectively rational consumption behavior
Crama, Yves ULg

Conference (2014, October 28)

To verify the empirical adequacy of a particular household consumption model, it is important to develop efficient tests that can be applied to real-world data. These tests check whether the observed ... [more ▼]

To verify the empirical adequacy of a particular household consumption model, it is important to develop efficient tests that can be applied to real-world data. These tests check whether the observed household behavior is "rational", in the sense that it is consistent with the predictions of the model. In this talk, we present different approaches based on revealed preferences to test collective models of household consumption. Testing collective rationality is computationally difficult (NP-hard). In order to overcome this negative result, we introduce mixed-integer programming formulations which can be used for medium-sized data sets. Next, we propose simulated annealing heuristics, which allow for efficient testing of the collective model on large data sets. We present the results of computational experiments using our approaches. [less ▲]

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See detailUTILISATION DES RESIDUS DE LAVAGE DES GRANULATS DE CARRIERES DANS L’ELABORATION DE PIECES CERAMIQUES (REGION DE TAMAZOUZT, MAROC).
El Boudour El Idrissi, Hicham ULg; Daoudi, Lahcen; El Ouahabi, Meriam ULg et al

Conference (2014, October 27)

Le site potier de Tamazouzt est situé à 40 km au Sud-Est de la ville de Marrakech. La production est sous forme de poterie décorative d’ustensiles rustiques. La matière première utilisée dans ... [more ▼]

Le site potier de Tamazouzt est situé à 40 km au Sud-Est de la ville de Marrakech. La production est sous forme de poterie décorative d’ustensiles rustiques. La matière première utilisée dans l’élaboration de ces produits est issue de résidus de lavage des carrières de granulats exploités le long des oueds. En plus de la qualité des produits et des rendements élevés, ce site donne un bon exemple de valorisation des résidus de lavage qui causent des problèmes pour l’environnement et pour les industriels. Nous avons caractérisé cette matière première afin d’en faire la promotion et d’encourager l’exploitation de tels matériaux dans le domaine de la céramique à l’échelle globale. Les résultats des analyses montrent que la pâte est constituée de 62% d’argiles, 23% de limons et 15% de sables ; l’indice de plasticité est de l’ordre de 16. Pour 27% d’humidité, le degré de retrait au séchage ne dépasse pas 6%. La minéralogie indique la présence de quartz (32%), plagioclase (20%), feldspaths potassiques (10%), calcite (3%) et argile (31%). Les minéraux argileux sont constitués d’illite (16%), de chlorite (7%), de kaolinite (4%) et de vermiculite (4%). La teneur en matière organique est de 4%. La composition chimique est surtout silico-alumineuse (64% de SiO2, 17% d’Al2O3). Les autres éléments majeurs dont la teneur est significative (> 1%) sont : Fe2O3 (8%), MgO (4%), K2O (3%), CaO (3%), Na2O (2%). Les pièces cuites à 1050°C présentent 2% de retrait, 13% de porosité à l’eau, la résistance mécanique à la compression et à la flexion est respectivement de 63 et 20 Mpa. L’analyse DRX des pièces cuites à 1050°C a montré l’apparition de géhlénite, anorthite, diopside et d’hématite. Ces résultats indiquent qu’en plus de l’utilisation locale dans la poterie décorative ces argiles pourraient être valorisées comme matériaux de construction vue leur caractère isolant (bonne porosité), résistance (bon comportement mécanique) et leur couleur rouge (présence de l’hématite). [less ▲]

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See detailHeidegger et Wittgenstein
Gauvry, Charlotte ULg

Conference (2014, October 27)

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See detailSexually dimorphic effect of gestational exposure to BPA on DNA methylation pattern in the rat placenta
FUDVOYE, Julie ULg; Dehan, Pierre ULg; Trooskens, Gheert et al

Conference (2014, October 27)

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See detailEvolution des eucaryotes : l'éclairage de la phylogénie moléculaire
Baurain, Denis ULg

Conference (2014, October 23)

Ce cours-conférence propose d'examiner l'origine et l'évolution des eucaryotes au travers de la biologie, la géologie et la paléontologie. Les eucaryotes forment un des trois domaines de la vie, et ... [more ▼]

Ce cours-conférence propose d'examiner l'origine et l'évolution des eucaryotes au travers de la biologie, la géologie et la paléontologie. Les eucaryotes forment un des trois domaines de la vie, et comprennent les animaux (dont les êtres humains), les plantes et les champignons, mais surtout une énorme majorité de protistes (eucaryotes unicellulaires) dont la diversité reste encore en partie à explorer. De grandes questions restent à élucider quant à l'origine du domaine Eucarya, sa position au sein de l'arbre de la vie, et les modalités et conditions de diversification et d'évolution depuis au moins 1,8 milliards d'années. La première leçon abordera l'origine de la cellule eucaryote, en discutant les différentes hypothèses existantes et la nature de LECA (Last Eucaryotic Common Ancestor). Comment tester ces hypothèses avec de nouvelles approches ? Comment révéler la diversité actuelle des eucaryotes encore en partie inexplorée et quelles réponses peut-elle apporter ? La seconde leçon présentera d'abord l'éclairage de la phylogénie moléculaire : comment utiliser les informations conservées dans le matériel génétique, pour mieux comprendre l'évolution des eucaryotes ? Quelles sont les possibilités et les limitations de la phylogénomique et des horloges moléculaires ? On présentera ensuite les informations enregistrées dans le registre fossile du Précambrien. Comment reconnaitre les eucaryotes fossiles, les étudier, et reconstruire leur évolution et diversification dans les conditions paléoenvironnementales depuis au moins 1,8 milliards d'années ? Ces deux leçons donneront donc un aperçu de l'état des connaissances, des nouvelles méthodes utilisées, et des grandes énigmes à résoudre à propos de notre domaine Eucarya. [less ▲]

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See detailThe effect of Brand Anthropomorphism on Self-Disclosure
Gretry, Anaïs ULg; Horváth, Csilla; Belei, Nina et al

Conference (2014, October 23)

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See detailBiodegradable polyester-based microcarriers with modified surface tailored for tissue engineering
Grandfils, Christian ULg; Privalova, A.; Sevrin, Chantal ULg et al

Conference (2014, October 23)

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See detailUniversité : Les interactions possibles avec l’enseignement non-universitaire
Winand, Jean ULg

Conference (2014, October 23)

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See detailThe Initial Upper Paleolithic in Northeast Asia: toward the definition of a techno-complex
Zwyns, N.; Teyssandier, N.; Izuho, M. et al

Conference (2014, October 23)

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See detailL'ambivalence de la bibliothèque: l'érudition au XVIIe siècle
Decoster, Sara ULg

Conference (2014, October 22)

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See detailInfluence of Morphine on the Rabbit Gastrointestinal Tract
Deflers, Hélène ULg; Bolen, Géraldine ULg; Gandar, Frederic ULg et al

Conference (2014, October 20)

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See detailArchitectures implicites, pouvoirs invisibles : le libertinage érudit
Decoster, Sara ULg

Conference (2014, October 20)

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See detailAdvances in the synthesis of degradable polymers for biomedical applications
Lecomte, Philippe ULg

Conference (2014, October 20)

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See detailThe Airline Container Loading Problem with Pickup and Delivery
Lurkin, Virginie ULg; Schyns, Michael ULg

Conference (2014, October 19)

The present paper looks into the problem of optimizing the loading of a set of containers and pallets into cargo aircraft serving multiple airports. Due to the pickup and delivery operations occurring at ... [more ▼]

The present paper looks into the problem of optimizing the loading of a set of containers and pallets into cargo aircraft serving multiple airports. Due to the pickup and delivery operations occurring at intermediate airports, this problem is simultaneously a weight and balance problem and a sequencing problem. Our objective is to minimize fuel and handling operations costs. This problem is shown to be NP-hard. We resort to a mixed integer linear program. On the basis of a professional partner's real-world data, TNT Airways, we perform numerical experiments using a standard B&C library. This approach yields better solutions than traditional manual planning, which results in substantial cost savings. [less ▲]

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See detailExperimental in vivo infection of pigs by a wild boar hepatitis E virus strain
Thiry, Damien ULg; Rose, Nicolas; Paboeuf, Frédéric et al

Conference (2014, October 17)

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See detailL'evidence-based practice en psychologie et en logopédie
Durieux, Nancy ULg

Conference (2014, October 17)

L’evidence-based practice (EBP) est une approche qui recommande d’optimiser les soins de santé en intégrant les meilleures données actuelles issues de la recherche scientifique, l’expertise des cliniciens ... [more ▼]

L’evidence-based practice (EBP) est une approche qui recommande d’optimiser les soins de santé en intégrant les meilleures données actuelles issues de la recherche scientifique, l’expertise des cliniciens ainsi que la situation et les préférences de chaque patient (Sackett et al., 1996). L’EBP fait couler beaucoup d’encre en médecine, où elle prend sa source, mais également dans d’autres disciplines. Certains praticiens ne jurent que par elle, d’autres la décrient… Quoiqu’il en soit, le recours à l’EBP est de plus en plus encouragé en logopédie et en psychologie. Les principaux objectifs de cette conférence seront de définir l’EBP, d’en décrire les étapes et d’exposer les bénéfices et les obstacles à son application. Des perspectives d’avenir seront également discutées afin que l’EBP puisse intégrer le quotidien des logopèdes et des psychologues en Belgique. [less ▲]

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See detailLien entre représentation du vieillissement chez le personnel de MR/MRS et la qualité de vie de résidents déments: Intérêt de l’enquête FIH
Missotten, Pierre ULg

Conference (2014, October 17)

A l’heure actuelle, la vision prégnante du vieillissement est négative, teintée des phénomènes d’âgisme et de jeunisme. Cette vision est objectivée dans diverses enquêtes récentes (ex : l’Eurobaromètre ... [more ▼]

A l’heure actuelle, la vision prégnante du vieillissement est négative, teintée des phénomènes d’âgisme et de jeunisme. Cette vision est objectivée dans diverses enquêtes récentes (ex : l’Eurobaromètre des statistiques de discrimination en Europe) qui soulignent que le motif de discrimination le plus souvent cité en Europe est l’âge (correspondant ici au fait d’avoir plus de 55 ans ; 4 % en 2012, 6 % en 2009), suivi seulement par la race (3 %). Si la personne vieillissante est déjà stigmatisée en général, il n’est pas étonnant de constater que le fait d’être atteint d’une pathologie démentielle accroît encore ce phénomène : les individus souffrant de démence sont considérés comme faisant partie du groupe le plus marginalisé et stigmatisé dans la société (Graham et al., 2003). Les personnes qui en sont atteintes sont souvent perçues comme n’ayant plus une bonne qualité de vie (Qdv) ni la capacité d’éprouver du plaisir (Garand et al., 2009). En ce sens, ces personnes font donc l’objet d’une double stigmatisation (stigmatisation liée au fait d’être âgé et d’être atteint de démence). Sur base de ce constat, cette présentation s’axera sur les liens qui peuvent exister entre nos représentations du vieillissement (et de la démence) et le concept de Qdv. Tout d’abord, nous aborderons les résultats des recherches dans le vieillissement « normal ». A côté des études de Levy (cf. Levy, 2009 pour une synthèse) ayant démontré l’impact délétère d’une vision négative du vieillissement sur la santé mentale et physique des aînés, diverses études récentes (ex : Bodner et al., 2011) ont montré qu’une vision négative du vieillissement était liée à une moindre Qdv. Plus encore, le niveau de Qdv peut en partie s’expliquer par la vision du vieillissement (ex : Top et al., 2012). Ces constations nous amènent à nous questionner sur la situation dans le cadre des pathologies démentielles. A ce niveau, il s’avère nécessaire de recourir à une hétéro-évaluation de la Qdv pour toute personne souffrant d’une démence sévère. En ce sens, ce n’est pas le patient lui-même qui fournit des réponses mais un aidant (professionnel ou familial). Sur base de cet élément, nous avons mis au point un protocole de recherche destiné à évaluer la Qdv de personnes souffrant de pathologies démentielles vivant en MR ou MRS, en y incluant des mesures d’âgisme des aidants. Ce protocole a été élaboré dans le cadre d’une collaboration avec l’ASBL Fédération des Institutions Hospitalières (FIH). Nous faisons l’hypothèse que la perception d’une même réalité (un même patient est évalué sur base d’un même outil) c.à.d. la qualité de vie, serait en partie tributaire de la vision que chaque soignant a du vieillissement et de la démence. Dans le prolongement de la présentation de cette étude, nous aborderons le fait qu’avoir une vision négative du vieillissement et de la démence nous amène à avoir des attitudes différentes (souvent bienveillantes mais pas toujours positives) à l’égard des personnes âgées. Ces attitudes ont un impact délétère sur la santé mentale et physique des personnes âgées et donc aussi sur leur qualité de vie (ex : Mandelblatt et al., 2003). Ces conséquences de l’âgisme sont donc susceptibles de confirmer la vision négative véhiculée à l’égard des personnes âgées (ex. : les personnes âgées sont vulnérables, dépendantes et ont une mauvaise qualité de vie) et ainsi d’alimenter un cercle vicieux. Biblio 1. Eurobaromètre 57.0 - mai 2012 - http://europa.eu.int/comm/public_opinion/ 2. Graham et al., 2003 Int J Geriatr Psychiatry, 18(8), 670-678. 3. Garand et al. (2009). Res Gerontol Nurs, 2(2), 112-121. 4. Levi (2009). Curr Dir Psychol Sci; 18, 332-6 5. Bodner et al. (2011). Int Psychogeriatr,23(8),1197–1204 6. Top et al. (2012). Research on Aging, 35(5), 533-562 7. Mandelblatt et al. (2003). J Clin Oncol, 21, 855-863. [less ▲]

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See detailÉpidémiologie de la lithiase urinaire en Province de Liège
Castiglione, Vincent ULg; JOURET, François ULg; Bruyère, Olivier ULg et al

Conference (2014, October 17)

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See detailLes îles (d')où fuir. Poétique croisée de la robinsonnade et de l'anticipation
Stienon, Valérie ULg

Conference (2014, October 17)

Il existe des parentés remarquables entre certaines caractéristiques du roman d’aventures et les premières fictions d’anticipation françaises. Il n'y a pas seulement que la notion d’"aventure" est floue ... [more ▼]

Il existe des parentés remarquables entre certaines caractéristiques du roman d’aventures et les premières fictions d’anticipation françaises. Il n'y a pas seulement que la notion d’"aventure" est floue, composant une catégorie infiltrante tenant de l’hypergenre ou du genre parasite, mais il existe aussi des propriétés communes formant un genre hybride de « science-fiction d’aventures» qui compose un corpus important, pourtant peu considéré par les études littéraires consacrées au récit d'anticipation. Envisagé sous cet angle, tout un pan de la production d’anticipation de la seconde moitié du XIXe siècle apparaît comme marqué par le déplacement géographique autant sinon davantage que par le voyage temporel, cultivant une plasticité qui permet dans certains cas des reprises à l’identique ou presque. Ce sont ces procédés d’hybridation qui font l'objet de cette communication, à partir d’un type de récits généralement considéré comme un sous-genre matriciel de l’aventure, la robinsonnade, considérée dans quatre romans du dernier quart du XIXe siècle: André Laurie, Les Exilés de la Terre; Georges Le Faure, Les Robinsons lunaires; Jules Verne, L'Île à hélice; Paul Adam, Lettres de Malaisie. [less ▲]

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See detailDépression, niveau d'engagement dans des activités et processus psychologiques : Nouvel axe de lecture et nouveaux outils d'évaluation
Wagener, Aurélie ULg

Conference (2014, October 17)

Cet atelier aura pour objectif de présenter un modèle théorique, testé auprès de 500 personnes, des liens entre la dépression, le niveau d’engagement dans des activités et différentes familles de ... [more ▼]

Cet atelier aura pour objectif de présenter un modèle théorique, testé auprès de 500 personnes, des liens entre la dépression, le niveau d’engagement dans des activités et différentes familles de processus psychologiques (image de soi, pensées négatives répétitives, évitement expérientiel, satisfaction environnementale, régulation émotionnelle et tendance à l’approche). Plus précisément, nous menons actuellement une étude dont les résultats nous permettront d’identifier les processus psychologiques médiateurs de la relation entre la dépression et le niveau d’engagement dans des activités. Ces processus psychologiques médiateurs pourront donc devenir des cibles précises et identifiées du traitement psychothérapeutique. Pour mener à bien cette étude, nous avons réalisé une revue de la littérature des outils évaluant spécifiquement ces processus psychologiques. Certains questionnaires ont été traduits de l’Anglais au Français et sont en cours de validation. L’ensemble des échelles utilisées, leur utilité et leur cotation, seront présentées lors de l’atelier. Elles seront également mises à disposition des cliniciens intéressés. Une discussion concernant les patients avec lesquels les utiliser sera également proposée. [less ▲]

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See detailVitamine D: métabolisme, sources, modes d'action.
CAVALIER, Etienne ULg

Conference (2014, October 16)

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