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See detailConsidérations finales
Wautelet, Patrick ULg

in Caestecker, Franck; Renauld, Bernadette; Perrin, Nicolas (Eds.) et al Devenir belge. Histoire de l'acquisition de la nationalité belge depuis 1830 (2016)

Ce texte constitue une postface offrant quelques commentaires sur les textes rassemblés dans l'ouvrage.

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See detailEn quoi l'ajout d'un élément de gamification (badges) impacte la réalisation des tests d'entraînement ?
Marique, Pierre-Xavier ULg; Van de Poël, Jean-François ULg; Hoebeke, Maryse ULg

Conference (2016, May)

Le département de physique de l’Université de Liège a développé un outil de soutien à l’apprentissage pour le cours de physique à destination des étudiants inscrits en première année de médecine. Le choix ... [more ▼]

Le département de physique de l’Université de Liège a développé un outil de soutien à l’apprentissage pour le cours de physique à destination des étudiants inscrits en première année de médecine. Le choix s’est porté sur une plateforme en ligne afin qu’elle soit accessible à chaque instant et de n’importe quel endroit, moyennant une connexion internet. L’étudiant, interrogé sous forme de questions à choix multiples, peut notamment utiliser un simulateur d’examens. Il peut à tout moment générer un test selon trois paramètres : la ou les matières qu’il souhaite travailler, le temps qu’il désire y consacrer et le niveau de maitrise qu’il souhaite atteindre. Dès lors, un test d’entrainement est généré automatiquement selon les critères choisis. L’étudiant peut visualiser son état d’avancement dans la matière grâce à une série de badges qu’il est invité à collecter. Une fois certains badges acquis, l’apprenant a la possibilité de télécharger un « pass » personnel lui donnant accès à une séance de simulation d’examen organisée en amphithéâtre. Cette étude présentera les premiers résultats de cette expérimentation. La corrélation avec les notes obtenues à l’examen ainsi que l’impact de la mise en place des badges dans le dispositif d’un point de vue motivationnel seront étudiés. [less ▲]

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See detailINFLUENCE OF LOCAL BUCKLING ON THE SHEAR RESISTANCE OF BOLTED CONNECTIONS FOR TUBULAR RACKING STRUCTURES
D'Antimo, Marina ULg; Demonceau, Jean-François ULg; Jaspart, Jean-Pierre ULg et al

in THE INTERNATIONAL COLLOQUIUM ON STABILITY AND DUCTILITY OF STEEL STRUCTURES, Timisoara 30 May-01 June 2016 (2016, May)

The competition in the field of storage racking structures is so that companies are always look-ing for new structural solutions aiming at containing construction time and expenses. This pa-per focuses ... [more ▼]

The competition in the field of storage racking structures is so that companies are always look-ing for new structural solutions aiming at containing construction time and expenses. This pa-per focuses the bearing failure of shear joint using long bolts through thin tubular members with the purpose to check the reliability of Eurocode 3 formulation. The used hollow sections are free to buckle inward leading to a bearing resistance lower than the one predicted using EC3. In fact EC3 does not account for the possible occurrence of out-of-plane deformations in shear connection assuming that the connected plates are restrained by the bolt head and the nut. In order to investigate this phenomenon, an experimental campaign has been developed, a FE model Abaqus/CAE has been validated and a parametric study has been performed. The present paper introduces the conducted investigations. [less ▲]

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See detailANALYTICAL PREDICTION OF THE BEARING RESISTANCE OF BOLTED CONNECTIONS FOR TUBULAR RACKING STRUCTURES
Armenante, Vittorio; D'Antimo, Marina ULg; Demonceau, Jean-François ULg et al

in THE INTERNATIONAL COLLOQUIUM ON STABILITY AND DUCTILITY OF STEEL STRUCTURES, Timisoara 30 May-01 June 2016 (2016, May)

The aim of this paper is to provide a formulation able to predict the resistance of simple shear connections realized by fastening a plate to a hollow square section by means of long bolts. The research ... [more ▼]

The aim of this paper is to provide a formulation able to predict the resistance of simple shear connections realized by fastening a plate to a hollow square section by means of long bolts. The research is motivated by the fact that the rules currently provided by EC3 for defining the bearing resistance of steel connections are limited to the case of stacks of plates, where every plate composing the connection is always restrained out of plane by the adjoining plate or by the bolt head or nut. This is a condition not verified in case of connections realized with long bolts fastening hollow sections. The work is organized in two sections. First, the results of an experimental campaign are presented and successively, the results of a parametric analysis carried out by means of a Finite Element model calibrated on the experimental data are reported. Afterwards, an analytical approach able to include the local buckling effects arising in these kinds of connections is presented, proposing a coefficient for the reduction of the resistance, to be included in the EC3 formulation. [less ▲]

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See detailSelf-Medication Practice among Amateur Runners: Prevalence and Associated Factors
Locquet, Médéa ULg; Beaudart, Charlotte ULg; LARBUISSON, Robert ULg et al

in Journal of Sports Science & Medicine (2016), 15(2), 387-8

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See detailComparison of 3 Diffractive IOLs in 3 Wavelengths Bifocal/ EDOF/Trifocal.
Gatinel, Damien; Pagnoulle, Christophe; Loicq, Jerôme ULg et al

Conference (2016, May)

Purpose To describe the optical performances of 3 types of diffractive hydrophobic intraocular lenses (IOLs): monofocal achromatic, bifocal and trifocal, using various visible wavelengths. Methods 3 IOLs ... [more ▼]

Purpose To describe the optical performances of 3 types of diffractive hydrophobic intraocular lenses (IOLs): monofocal achromatic, bifocal and trifocal, using various visible wavelengths. Methods 3 IOLs were measured with an optical bench (PMTF,LambdaX,Nivelles, Belgium) to determine modulation transfer function (MTF) and point spread function (PSF). Measurements were performed at 480 nm,546 nm,650 nm using an aberration free cornea and aspheric artificial cornea generating +0.28µm positive spherical aberration by ISO11979-2 guidelines. Through-focus MTF was recorded for various pupil apertures. Evaluation of halos was performed from PSF measurements obtained at each focal spot location. Images of USAF targets were recorded with simulated distances from 1m to 25cm. Amplitude of off-axis peaks of radial profile of PSF enabled to quantify percentage of energy within the halos. Results The monofocal and the bifocal IOLs presented 2 peaks on the through-focus MTF in green light: intermediate vision (at +1.75D) for the monofocal achromatic lens, and far and near vision (at +4D) for the bifocal IOL of the same material. Three peaks (Distance, Intermediate at +1.75D, Near at +3.5D) were recorded with the trifocal IOL at any wavelength. The achromatic monofocal IOL was monofocal for far vision with red light and monofocal for near vision with blue light. The influence of the cornea models was limited. The amount of halos were comparable between lenses (3 to 5 % of the enclosed central light energy). Conclusion The achromatic diffractive IOL behaved like a bifocal IOL with an intermediate addition foci in green light. The bifocal and trifocal IOL induced similar chromatic effects for the near (bifocal, trifocal) and intermediate (trifocal) foci. [less ▲]

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See detailNo evidence for genetic differentiation between French and Belgian populations of the exotic tree Robinia pseudoacacia
Bouteiller, Xavier; Aikio, E; Raimbault, A et al

Poster (2016, May)

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See detailStructuration of Robinia pseudoacacia L. genetic diversity in the American natural range and derived Belgian populations
Verdu, Cindy; Daïnou, Kasso; De Thier, Olivier et al

Poster (2016, May)

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See detailLe régime de la rétention des ressortissants de pays tiers en séjour irrégulier à l'aune des droits fondamentaux, Interprétation des articles 15 et 16 de la directive retour par la Cour de justice de l'Union européenne
Vandenbosch, Sofia ULg

in Vandenbosch, Sofia; Hoc, Arnaud; Wattier, Stéphanie (Eds.) et al Human Rights as a Basis for Reevaluating and Reconstructing the Law (2016)

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See detailEndométriose minime et légère: quel impact sur la fertilité?
BRICHANT, Géraldine ULg; AUDEBERT, Alain; NISOLLE, Michelle ULg

in Revue Médicale de Liège (2016), 71(5), 236-241

L’endométriose minime ou légère (stades I/II) est fréquemment identifiée chez les femmes hypofertiles, surtout en cas de stérilité inexpliquée. L’impact de ces lésions sur la fertilité est controversé ... [more ▼]

L’endométriose minime ou légère (stades I/II) est fréquemment identifiée chez les femmes hypofertiles, surtout en cas de stérilité inexpliquée. L’impact de ces lésions sur la fertilité est controversé, certains les considérant comme paraphysiologiques. Elles sont hétérogènes dans leur étendue, leur activité biologique, l’inflammation qui les caractérise ou les adhérences qu’elles peuvent induire. La diminution de la qualité ovocytaire, et de la mobilité des spermatozoïdes ainsi que les altérations endométriales apparaissent comme les mécanismes les plus pertinents pour expliquer l’hypofertilité. La fécondité spontanée des femmes présentant une endométriose minime ou légère est diminuée en comparaison avec celle des femmes pour lesquelles le diagnostic de stérilité inexpliquée a été posé. L’insémination intra-utérine avec stimulation de l’ovulation améliore la fertilité des femmes traitées. L’ablation coelioscopique des lésions endométriosiques améliore de façon modeste la fécondité, conduisant à recommander cette pratique compte tenu de ses faibles risques. La fécondation in vitro (FIV) est le moyen le plus efficace permettant d’obtenir des résultats similaires ou légèrement inférieurs à ceux observés chez les femmes témoins présentant une infertilité tubaire. L’impact des endométrioses minimes et légères sur la fertilité apparaît très probable, au moins pour certaines lésions qui demandent à être identifiées. [less ▲]

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See detailCrossoads ( mai 2016) - chaque mercredi de 18h à20h - rediffusion: samedis de 22h à minuit
Sacré, Robert ULg

Diverse speeche and writing (2016)

Programme radio hebdomadaire consacré aux musiques africaines-américaines - streaming : www.equinoxefm.be - podcasts : www.mixcloud.com/robertsacre9

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See detailDeep Background Subtraction with Scene-Specific Convolutional Neural Networks
Braham, Marc ULg; Van Droogenbroeck, Marc ULg

in International Conference on Systems, Signals and Image Processing, Bratislava 23-25 May 2016 (2016, May)

Background subtraction is usually based on low-level or hand-crafted features such as raw color components, gradients, or local binary patterns. As an improvement, we present a background subtraction ... [more ▼]

Background subtraction is usually based on low-level or hand-crafted features such as raw color components, gradients, or local binary patterns. As an improvement, we present a background subtraction algorithm based on spatial features learned with convolutional neural networks (ConvNets). Our algorithm uses a background model reduced to a single background image and a scene-specific training dataset to feed ConvNets that prove able to learn how to subtract the background from an input image patch. Experiments led on 2014 ChangeDetection.net dataset show that our ConvNet based algorithm at least reproduces the performance of state-of-the-art methods, and that it even outperforms them significantly when scene-specific knowledge is considered. [less ▲]

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See detailPhotoconductivity and photoconversion at a photorefractive thin crystal plate
Frejlich, Jaime; de Oliveira, Ivan; de Araujo, William R. et al

in Optical Materials (2016), 55

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See detailMicroparticules à base d’amidon radiomarquées au 188Re et 68Ga comme agent théranostique pour la radiothérapie interne sélective du carcinome hépatocellulaire
Verger, Elise ULg; Drion, Pierre ULg; MEFFRE, Geneviève ULg et al

in 2es Journées Francophones de Médecine Nucléaire (2016, May), 40(3), 182

Les microparticules SBMP, en étant capable d'être radiomarquées rapidement, de manière reproductible, sous forme de kits prêt-à-l‘emploi, par du 188Re et du 68Ga, se révèlent être un outil théranostique ... [more ▼]

Les microparticules SBMP, en étant capable d'être radiomarquées rapidement, de manière reproductible, sous forme de kits prêt-à-l‘emploi, par du 188Re et du 68Ga, se révèlent être un outil théranostique prometteur pour le traitement du carcinome hépatocellulaire. [less ▲]

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See detailThe Sensitivity of Children with SLI to Phonotactic Probabilities During Lexical Access
Quémart, Pauline; Maillart, Christelle ULg

in Journal of Communication Disorders (2016), 61

The procedural deficit hypothesis (Ullman & Pierpont, 2005) has been proposed to account for the combination of linguistic and nonlinguistic deficits observed in specific language impairment (SLI ... [more ▼]

The procedural deficit hypothesis (Ullman & Pierpont, 2005) has been proposed to account for the combination of linguistic and nonlinguistic deficits observed in specific language impairment (SLI). According to this proposal, SLI results from a deficit in procedural memory that prevents children from developing sensitivity to probabilistic sequences. We tested the ability of children with SLI to rely on a specific type of probabilities characterizing sequences that occur in a given language: phonotactic probabilities. Twenty French-speaking children with SLI (M = 10;1), 20 typically developing children matched for chronological age (M = 10;0) and 20 typically developing children matched for receptive vocabulary (M = 7;4) performed an auditory lexical decision task. Pseudoword stimuli were built with combinations of either frequently associated phonemes (high phonotactic probability) or infrequently associated phonemes (low phonotactic probability). Phonotactic probabilities had a significant impact on the accuracy and speed of pseudoword rejection in children with SLI, but not in the two control groups. SLI children's greater reliance on phonotactic probabilities relative to typically developing children appears to contradict the PD hypothesis. Phonotactic probabilities may help them to partially overcome their difficulties in accessing the phonological lexicon during spoken word recognition. [less ▲]

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See detailL'énonciation énoncée dans l'image
Dondero, Maria Giulia ULg

in Colas-Blaise, Marion; Tore, Gian Maria; Perrin, Laurent (Eds.) L'énonciation aujourd'hui (2016)

Le propos de cet article est de rendre compte des développements de la théorie de l’énonciation à la suite de la proposition d’Emile Benveniste d’étendre ce concept à la musique et à d’autres langages non ... [more ▼]

Le propos de cet article est de rendre compte des développements de la théorie de l’énonciation à la suite de la proposition d’Emile Benveniste d’étendre ce concept à la musique et à d’autres langages non verbaux. Un retour sur cette question se révèle aujourd’hui nécessaire pour plusieurs raisons. Certaines sont internes à la discipline et aux sciences du langage — la légitimité du visuel en tant que langage —, d’autres sont extra-disciplinaires, venant surtout des sciences de la communication et de la philosophie de l’art. Nous aborderons ici deux questions fondamentales concernant l’énonciation dans le visuel, étroitement liées entre elles. La première concerne la subjectivité inscrite dans l’image et sera approchée via la notion d’énonciation énoncée (personne/espace/temps). L’analyse énonciative de l’énoncé visuel vise en effet à décrire « d’où l’on voit », à savoir les points de vue à partir desquels l’image a été conçue et demande à être saisie par le regard de l’observateur. La deuxième question concerne la notion de métalangage. Comme l’a affirmé Jacques Fontanille, l’énonciation est « un métalangage "descriptif" car, en prédiquant l’énoncé, elle affiche sa propre activité, elle la code et en fait un événement sensible ou observable » (Sémiotique du discours, 2003, p. 283). Une première interrogation émerge alors : peut-on parler de métalangage dans le cadre du visuel, où il est d’ailleurs déjà difficile de repérer une véritable langue visuelle, dotée d’un alphabet de signes disjoints et d’une grammaire figée ? [less ▲]

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See detailEnergy Reduction in Public Building Stock: Assessing the Impact of Control Strategy over Expected Energy Savings and Indoor Comfort Level
Ruiz Flores, Roberto ULg; D’Antoni, Matteo; Lemort, Vincent ULg

in CLIMA 2016 - proceedings of the 12th REHVA World Congress: volume 1. Aalborg: Aalborg University, Department of Civil Engineering. (2016, May)

In the framework of EU FP7 BRICKER project, the renovation of public owned nonresidential buildings is addressed through the installation of innovative passive and active technologies. The expected impact ... [more ▼]

In the framework of EU FP7 BRICKER project, the renovation of public owned nonresidential buildings is addressed through the installation of innovative passive and active technologies. The expected impact is a primary energy reduction of about 50% with respect to the existing scenario with a large replication potential under different European countries. In order to achieve such ambitious goal one issue that cannot be ignored is the effect of control strategy, not only over the resulting energy performance but also over the resulting indoor comfort conditions. In this paper, the actual control strategy implemented in the Belgian demo of Bricker project is introduced, compared against an ideal approach and accordingly optimized. The resulting proposed approach is then tested by means of numerical simulations over a base case scenario before renovation. The main conclusion of this work is the demonstration that control strategy of energy generation and distribution systems has to be revised whenever deep renovation of passive or active building technologies is undertaken. Contrarily to which, project renovation goals cannot be met. [less ▲]

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See detailCoherent backscattering in the Fock space of Bose- and Fermi-Hubbard systems
Engl, Thomas; Dujardin, Julien; Tisserond, Emilie et al

Poster (2016, May)

Coherent backscattering generally refers to a significant and robust enhancement of the average backscattering probability of a wave within a disordered medium, which from a semiclassical point of view ... [more ▼]

Coherent backscattering generally refers to a significant and robust enhancement of the average backscattering probability of a wave within a disordered medium, which from a semiclassical point of view arises due to the constructive interference between backscattered trajectories and their time-reversed counterparts. We recently investigated the manifestation of this wave interference phenomenon in the Fock space of a disordered Bose-Hubbard system of finite extent [1], which can potentially be realized using ultracold bosonic atoms within optical lattices. Preparing the atoms in a well-defined Fock state of the lattice and letting the system evolve for a finite time will, for suitable parameters of the system and upon some disorder average over random on-site energies of the lattice, generally give rise to an equidistribution of the occupation probability within the energy shell of the Fock space that corresponds to the initial energy of the system, in accordance with the quantum microcanonical ensemble. We find, however, that the initial state is twice as often encountered as other Fock states with comparable total energy, which is a consequence of coherent backscattering [1]. Most recently, we showed that this phenomenon also arises in spin 1/2 Fermi-Hubbard rings that involve Rashba hopping terms (which combine inter-site hoppings with spin flips and arise from spin-orbit coupling), for which a newly developed semiclassical theory [2] correctly predicts a coherent enhancement of the occupation probabilities of the initial state and its spin-flipped counterpart. Moreover, performing a global spin flip within this Fermi-Hubbard system will give rise to significant spin echo peaks on those two Fock states, which is again a consequence of quantum many-body interference [3]. The semiclassical predictions of these enhancements and peaks are found to be in very good agreement with numerical findings obtained from the exact quantum time evolution within this Fermi-Hubbard system. References [1] T. Engl, J. Dujardin, A. Argüelles, P. Schlagheck, K. Richter, and J. D. Urbina, Phys. Rev. Lett. 112, 140403 (2014). [2] T. Engl, P. Plößl, J. D. Urbina, and K. Richter, Theoretical Chemistry Accounts 133, 1563 (2014). [3] T. Engl, J. D. Urbina, and K. Richter, arXiv:1409.5684. [less ▲]

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