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See detailAdditive Manufacturing of Metallic Materials: An Introduction
Mertens, Anne ULg

Learning material (2016)

This powerpoint presentation was used as teaching material in a seminar given as part of the course “Ingénierie des matériaux métalliques”. Following on a general introduction to additive manufacturing of ... [more ▼]

This powerpoint presentation was used as teaching material in a seminar given as part of the course “Ingénierie des matériaux métalliques”. Following on a general introduction to additive manufacturing of metallic materials, it outlines some important current issues in the development of additive technologies, by reporting on two case studies into the processing (1) of a single material system (i.e. Ti alloy Ti-6Al-4V) and (2) of a multimaterial system (i.e. a metal matrix composite). The first case study on Ti-6Al-4V reviews issues related to the dimensional accuracy of the produced components, as well as the control of their microstructures and usage properties. The second case study provides an introduction to metal matrix composites with a particular attention for the process known as laser cladding, focusing on the relationships between the thermal history during the production of a composite coating, and the resulting microstructure and properties, with special attention to the dissolution of ceramic particles (e.g. carbides) and to interfacial reactions taking place between the particles and the metallic matrix. [less ▲]

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See detailMobility of 137Cs, 10Be and 210Pb in soil as a function of the soil texture, organic matter content and pH
de Tombeur, Félix ULg; Cornu, Sophie; Bourlès, Didier et al

Poster (2016, November 30)

Vertical matter transfer processes (bioturbation and <2μm translocation) in soils and their dynamics are up to now poorly constrained although they are responsible for the temporal evolution of the ... [more ▼]

Vertical matter transfer processes (bioturbation and <2μm translocation) in soils and their dynamics are up to now poorly constrained although they are responsible for the temporal evolution of the ecosystem services. In order to better constrain and quantify these processes, a kinetic quantification of the involved transfers based on vertical profiles of 210Pb (xs), 10Be and 137Cs has been developed for Luvisols in which soluble transfers could be neglected. The range of applicability of this type of approach was nevertheless not tested. In this work, we analyzed 210Pb (xs), 10Be and 137Cs in soils exhibiting gradients of organic matter, pH and < 2 μm fraction (Podzol, Andosol Ferralsol, Leptosol). Acidic soils and large organic matter contents were considered. The depth distribution of the studied isotopes was then interpreted as a function of the organic matter content, the soil pH and its < 2 μm fraction. This demonstrates that 10Be and 137Cs losses occur under soluble form in the Podzol, especially under forest, more acid, for the latter. Soluble 10Be transfers were also identified in the Andosol when they were considered as negligible in the Leptosol. For 210Pb (xs), soluble transfers are also probable for soils with pH less than 5.5 (Andosol and Ferralsol) and strong affinity for organic matter has been demonstrated. Thus, under acidic conditions and low < 2 μm fraction, soluble transfer cannot neglected anymore. [less ▲]

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See detailLaBGen: A method based on motion detection for generating the background of a scene
Laugraud, Benjamin ULg; Pierard, Sébastien ULg; Van Droogenbroeck, Marc ULg

in Pattern Recognition Letters (2016)

Given a video sequence acquired with a fixed camera, the generation of the stationary background of the scene is a challenging problem which aims at computing a reference image for a motionless background ... [more ▼]

Given a video sequence acquired with a fixed camera, the generation of the stationary background of the scene is a challenging problem which aims at computing a reference image for a motionless background. For that purpose, we developed our method named LaBGen, which emerged as the best one during the Scene Background Modeling and Initialization (SBMI) workshop organized in 2015, and the IEEE Scene Background Modeling Contest (SBMC) organized in 2016. LaBGen combines a pixel-wise temporal median filter and a patch selection mechanism based on motion detection. To detect motion, a background subtraction algorithm decides, for each frame, which pixels belong to the background. In this paper, we describe the LaBGen method extensively, evaluate it on the SBI 2016 dataset and compare its performance with other background generation methods. We also study its computational complexity, the performance sensitivity with respect to its parameters, and the stability of the predicted background image over time with respect to the chosen background subtraction algorithm. We provide an open source C++ implementation at http://www.telecom.ulg.ac.be/labgen. [less ▲]

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See detailChemical composition and antimicrobial activity of essential oils of Ocimum basilicum, Ocimum canum and Ocimum gratissimum in function of harvesting time
Mith, Hasika; Yayi-Ladékan, Eléonore; Dosso Sika Kpoviessi, Salomé et al

in Journal of Essential Oil-Bearing Plants [=JEOBP] (2016), 19(6), 1413-1425

The chemical composition of essential oils obtained by hydrodistillation from aerial parts of Ocimum basilicum, Ocimum canum and Ocimum gratissimum from Benin as affected by harvesting time, were analyzed ... [more ▼]

The chemical composition of essential oils obtained by hydrodistillation from aerial parts of Ocimum basilicum, Ocimum canum and Ocimum gratissimum from Benin as affected by harvesting time, were analyzed by GC-FID (Gas chromatography-Flame ionization detector) and GC-MS (Gas chromatography-Mass spectrometry). Based on the composition analysis, major components were as follows: estragol (43.0-44.7%) and linalool (24.6 29.8%) in O. basilicum oils; carvacrol (12.0-30.8%) and p-cymene (19.5-26.2%) in O. canum oils; thymol (28.3-37.7%) and γ-terpinene (12.5-19.3 %) in O. gratissimum oils. Disc diffusion and broth microdilution assays were used to evaluate the antibacterial activity of essential oils and their main components against two foodborne bacteria, Listeria monocytogenes and Salmonella enterica serotype Typhimurium. The tested oils and their components exhibited notable antimicrobial activities against L. monocytogenes and S. Typhimurium. The O. canum and O. gratissimum oils collected at 7h and 19h showed significant higher activities against L. monocytogenes and S. Typhimurium (MICs and MBCs 0.34 - 2.5 μL/mL) (p < 0.05), whereas O. basilicum showed lower activity (MICs and MBCs 2.0 - 8.0 μL/mL) at any daytime of harvest, the weakest being at 19h (MIC and MBC 12.0 - 32.0 μL/mL). The daytime of harvest can influence the composition of oils and their activities on bacteria. [less ▲]

See detailLe décret relatif aux implantations commerciales et le droit de l’Union européenne : une logique juridique à l’encontre de celle d’un marché intérieur supranational ?
Van Cleynenbreugel, Pieter ULg

Scientific conference (2016, November 29)

This presentation analyses the applicability and relevance of EU law in the application of the Walloon commercial implantation permit decree. It argues that the regional legal framework is overall ... [more ▼]

This presentation analyses the applicability and relevance of EU law in the application of the Walloon commercial implantation permit decree. It argues that the regional legal framework is overall compatible with the spirit of EU law, yet in practice harbours the risk of incompatibilities. [less ▲]

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See detailAspects scientifiques du changement climatique: A quoi devons-nous nous attendre?
Ozer, Pierre ULg

Conference given outside the academic context (2016)

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See detailAnalytical Challenges in the Study of South-North Intra-EU Mobility
Lafleur, Jean-Michel ULg; Stanek, Mikolaj

Conference (2016, November 29)

This presentation discusses the challenges met in measuring the flows of Southern European EU migrants who moved to North Western Europe during the financial and economic crisis that started in 2008. The ... [more ▼]

This presentation discusses the challenges met in measuring the flows of Southern European EU migrants who moved to North Western Europe during the financial and economic crisis that started in 2008. The presentation shows that EU wide and national databases have strenghts and weaknesses and that further improvement in statistical data collection process could help the understanding of complex migratory patterns. More details is available on this research by downloading the free e-bbok at the following address: http://www.springer.com/gp/book/9783319397610 [less ▲]

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See detailImportance de l’océan pour la régulation du climat de nos régions
Gobert, Sylvie ULg

Scientific conference (2016, November 29)

Mise en évidence des rôles de l'océan dans notre climat et conséquences des changements actuels

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See detailActive Network Management for Electrical Distribution Systems
Gemine, Quentin ULg

Doctoral thesis (2016)

With the increasing share of renewable and distributed generation in electrical distribution systems, Active Network Management (ANM) has become a valuable option for a distribution system operator to ... [more ▼]

With the increasing share of renewable and distributed generation in electrical distribution systems, Active Network Management (ANM) has become a valuable option for a distribution system operator to operate his system in a secure and cost-effective way without relying solely on network reinforcement. ANM strategies are short-term policies that control the power injected by generators and/or taken off by loads in order to avoid congestion or voltage issues. While simple ANM strategies consist of curtailing temporary excess generation, more advanced strategies instead attempt to move the consumption of loads to anticipated periods of high renewable generation. Such advanced strategies mean that the system operator has to solve large-scale optimal sequential decision-making problems under uncertainty. The problems are sequential for several reasons. For example, decisions taken at a given moment constrain the future decisions that can be taken, and decisions should be communicated to the system’s actors sufficiently in advance to give them enough time for implementation. Uncertainty must be explicitly accounted for because neither demand nor generation can be accurately forecasted. This dissertation presents various research contributions about ANM for distribution systems. These contributions range from the motivation of using a framework of sequential decision-making under uncertainty to the study of computational methods that implement ANM strategies. A particular emphasis is placed on the formulation of the problem, which ultimately falls within the class of Markov decision processes. The modeling of stochasticity is explored and a novel approach that relies on a Gaussian Mixture Model is presented. Computational methods including several relaxations and approximations of multi-period and multi-scenario extensions of the optimal power flow problem with discrete decision variables were considered. [less ▲]

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See detailNeuropathies externes, canalaires et sportives
WANG, François-Charles ULg

Learning material (2016)

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See detailSommes-nous encore en démocratie?
Debras, François ULg; Verjans, Pierre ULg

Conference given outside the academic context (2016)

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See detailLes jeux vidéo : un modèle théorique pour la narration transmédia ?
Barnabé, Fanny ULg

Scientific conference (2016, November 28)

Les jeux vidéo peuvent-ils raconter des histoires ? Et, si c’est le cas, quelles sont leurs spécificités narratives ? Ces questions ont longtemps posé problème dans le champ des game studies, car les ... [more ▼]

Les jeux vidéo peuvent-ils raconter des histoires ? Et, si c’est le cas, quelles sont leurs spécificités narratives ? Ces questions ont longtemps posé problème dans le champ des game studies, car les conceptions traditionnelles du « récit » ne permettent pas de décrire de manière satisfaisante les modes de narration propres au médium vidéoludique. Or, à ce titre, le jeu vidéo n’est pas sans rappeler le transmédia : loin de ne représenter les histoires que sous la forme de suites linéaires d’événements, ces deux formats semblent plutôt organiser leur narration en architectures complexes, que nous appellerons des « univers fictionnels ». [less ▲]

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See detailThe EU’s geo-blocking Regulation proposal and its impact on the coherence of EU e-commerce regulation
Van Cleynenbreugel, Pieter ULg

Scientific conference (2016, November 26)

This presentation analyses and contextualises the EU's proposed geo-blocking regulation and its relationship to EU e-commerce legislation. It is addressed to an audience of cyberspace and e-law lawyers ... [more ▼]

This presentation analyses and contextualises the EU's proposed geo-blocking regulation and its relationship to EU e-commerce legislation. It is addressed to an audience of cyberspace and e-law lawyers and takes place in an ecommerce panel. Questions to be discussed concern the approach taken by the EU in tackling the challenges of e-commerce. [less ▲]

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See detailReturn to play after injection of PRP to treat tendinopathies
Kaux, Jean-François ULg

Conference (2016, November 26)

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See detailLa littérature (d’Armel Job) : l’histoire en suspens et l’être mis à nu
Cormann, Grégory ULg

Conference given outside the academic context (2016)

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See detailCorrection of inertial oscillations by assimilation of HFradar data in a model of the Ligurian Sea
Vandenbulcke, Luc ULg; Barth, Alexander ULg; Beckers, Jean-Marie ULg

in Ocean Dynamics (2016)

This article aims at analyzing if high-frequency radar observations of surface currents allow to improve model forecasts in the Ligurian Sea, where inertial oscillations are a dominant feature. An ... [more ▼]

This article aims at analyzing if high-frequency radar observations of surface currents allow to improve model forecasts in the Ligurian Sea, where inertial oscillations are a dominant feature. An ensemble of ROMS models covering the Ligurian Sea, and nested in the Mediterranean Forecasting System, is coupled with two WERA high-frequency radars. A sensitivity study allows to determine optimal parameters for the ensemble filter. By assimilating observations in a single point, the obtained correction shows that the forecast error covariance matrix represents the inertial oscillations, as well as large- and meso-scale processes. Furthermore, it is shown that the velocity observations can correct the phase and amplitude of the inertial oscillations. Observations are shown to have a strong effect during approximately half a day, which confirms the importance of using a high temporal observation frequency. In general, data assimilation of HF radar observations leads to a skill score of about 30 % for the forecasts of surface velocity. [less ▲]

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See detailLa médecine générale en mutation : perspectives sociologiques
Slomian, Cynthia ULg

Conference (2016, November 26)

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See detailL'activation comportementale est-elle pertinente pour tous les adultes dépressifs ? Une analyse en clusters
Wagener, Aurélie ULg; Baeyens, Céline; Van der Linden, Martial ULg et al

Poster (2016, November 26)

INTRODUCTION : L’hétérogénéité de la dépression est de plus en plus mise en évidence en termes de profils de symptômes, de réponse au traitement, etc. Les théories comportementales de la dépression ... [more ▼]

INTRODUCTION : L’hétérogénéité de la dépression est de plus en plus mise en évidence en termes de profils de symptômes, de réponse au traitement, etc. Les théories comportementales de la dépression soulignent l’importance de l’inactivité ainsi que des faibles niveaux de plaisir et de fréquence d’activités plaisantes dans le maintien de la dépression. Cette étude poursuit deux objectifs : (1) investiguer l’hétérogénéité de la depression via une analyse en clusters, (2) investiguer les valeurs prédictives de l’inactivité ainsi que des faibles niveaux de plaisir et de fréquence d’activités plaisantes sur la dépression en fonction du cluster d’appartenance. METHODE : Des adultes tout venant et/ou consultant des centres de santé mentale ont été recrutés (âge entre 18 et 60 ans). Ils ont complété l’Inventaire de Dépression de Beck – Seconde Edition, l’Echelle d’Activation Comportementale pour la Dépression – Version courte, et l’Inventaire des événements plaisants. RESULTATS : Une solution en six clusters a été mise en évidence : “gros dormeurs/heavy sleepers”, “dépressifs cognitifs/cognitive depressives”, “dépressifs affectifs-somatiques/affective-somatic depressives”, “dépressifs légers/mild depressives”, “dépressifs dormant peu/sleepless depressives”, “dépressifs typiques/typical depressives”. Des relations significatives entre inactivité, fréquence d’activités plaisantes et dépression ont seulement été observées chez les “dépressifs cognitifs/cognitive depressives”, les “dépressifs légers/mild depressives” et les “dépressifs typiques/typical depressives”. DISCUSSION : Les résultats confirment l’hétérogénéité de la dépression puisque six clusters ont été mis en évidence. Par ailleurs, l’activation comportementale ne semble pertinente que pour trois de ces clusters dans lesquels les postulats du modèle comportemental de la dépression sont confirmés (“dépressifs cognitifs/cognitive depressives”, “dépressifs légers/mild depressives”, “dépressifs typiques/typical depressives”). [less ▲]

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