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See detailNégociations et positions des intermédiaires sur le marché du travail non qualifié : une introduction
Orianne, Jean-François ULg

Conference (2016, June 09)

Comment le travail non qualifié fait-il l’objet d’échanges ? Comment s’effectuent les rencontres et les évaluations sur ce marché ? En s’intéressant aux intermédiaires du MT, l’objectif est de rendre ... [more ▼]

Comment le travail non qualifié fait-il l’objet d’échanges ? Comment s’effectuent les rencontres et les évaluations sur ce marché ? En s’intéressant aux intermédiaires du MT, l’objectif est de rendre compte du travail d’organisation, de médiation, de mise en valeur et d’évaluation effectué sur ce marché. [less ▲]

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See detailDescription of a laboratory's carrot
Vangeebergen, Thomas ULg

Scientific conference (2016, June 08)

Participation to a workshop on specific issues in ethnography: how to describe accurately and efficiently the objects present on the fieldwork? Each participant brings a short text with a depiction of a ... [more ▼]

Participation to a workshop on specific issues in ethnography: how to describe accurately and efficiently the objects present on the fieldwork? Each participant brings a short text with a depiction of a particular object (tool, organization, vehicle, apparatus, document, etc.), and try to show how it feeds the thin understanding of the situation, and allows a certain theoretical analysis. All participants comment the other texts and propose solutions to improve the quality of texts [less ▲]

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See detailBrexit et défense européenne. Décryptage
Dumoulin, André ULg

in e-Note (2016), 20

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See detailImpurity scattering effects on the superconducting properties and the tetragonal-to-orthorhombic phase transition in FeSe
Abdel-Hafiez, Mahmoud; Pu, Y. J.; Brisbois, Jérémy ULg et al

in Physical Review B (2016), 93

A comprehensive study of the doping dependence of the phase diagram of FeSe-based superconductors is still required due to the lack of a clean and systematic means of doping control. Here, we report on ... [more ▼]

A comprehensive study of the doping dependence of the phase diagram of FeSe-based superconductors is still required due to the lack of a clean and systematic means of doping control. Here, we report on the magneto-optical imaging, thermodynamic and transport properties, as well as in situ angle-resolved photoemission spectroscopy (ARPES) studies, on the impurity scattering in stoichiometric FeSe single crystals. Co doping at the Fe site is found to decrease the superconducting transition temperature. The upper critical field and specific heat all indicate a possible multiband superconductivity with strong coupling in the Co-doped system. A remarkable feature in FeSe is that its temperature dependent resistivity exhibits a wide hump at high temperatures, a signature of a crossover from a semiconductinglike behavior to metallic behavior. A structural tetragonal-to-orthorhombic phase transition Ts (a consequence of the electronic nematicity) is suppressed by either physical or chemical pressures. Due to the reconstruction of the Fermi surface at Ts, specific heat anomalies at Ts present ΔCp/Ts≈γn, the Sommerfield coefficient at low temperature. This reflects additional electronic instability in the FeSe(1−x)Sx system. ARPES data between 180 and 282 K indicates the existence of a chemical potential shift with increasing thermal excitations, resulting in a change of the Fermi-surface topology and exhibiting a semimetal behavior. We found that the temperature-induced Lifshitz transition is much higher than the temperature for the nematic order. [less ▲]

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See detailThe MAR model performances over Belgium
Wyard, Coraline ULg; Fettweis, Xavier ULg

Conference (2016, June 08)

This presentation deals with the set-up of the regional climate model MAR over Belgium. It also presents the performances of MAR to simulate the present-day climate following three reanalysis used as ... [more ▼]

This presentation deals with the set-up of the regional climate model MAR over Belgium. It also presents the performances of MAR to simulate the present-day climate following three reanalysis used as forcing of the model (ERA-Interim, ERA-20C and NCEP/NCAR-v1). [less ▲]

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See detailFire Resistance of Reinforced Concrete Columns Subjected to Standard Fire – Comparison of an Advanced and a Simplified Method
Achenbach, Marcus; Gernay, Thomas ULg; Morgenthal, Guido

in Garlock, Maria; Kodur, Venkatesh (Eds.) Structures in Fire (Proceedings of the Ninth International Conference) (2016, June 08)

For designing concrete columns subjected to a standard fire exposure, the Eurocode permits the use of simplified or advanced calculation methods. For the designer, the question of the respective ... [more ▼]

For designing concrete columns subjected to a standard fire exposure, the Eurocode permits the use of simplified or advanced calculation methods. For the designer, the question of the respective advantages of these two types of methods arises. Which situations demand the use of an advanced method? When does a simple method provide sufficient accuracy? In this paper, laboratory tests are recalculated using Finite Element Modeling (FEM) as an advanced and Extended Zone Model (EZM) as a simple method in order to investigate these questions. The recalculations indicate that the simple EZM is of sufficient accuracy for symmetric heated columns without restraints. In contrast, the mechanical behavior of columns heated on three sides demands an advanced method such as FEM to be properly described. [less ▲]

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See detailApproche psychocriminologique et légale du processus de radicalisation
Garcet, Serge ULg

Conference (2016, June 08)

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See detailPrediction of intra- and inter-laminar failure of laminates using non-local damage-enhanced mean-field homogenization simulations
Wu, Ling ULg; Sket, Federico; Adam, Laurent et al

Conference (2016, June 08)

The failure of carbon fiber reinforced composites with a quasi-isotropic sequence ([90/45/-45/90/0]S) and open-hole geometry is studied using a multiscale method [1]. On the one hand, the intra-laminar ... [more ▼]

The failure of carbon fiber reinforced composites with a quasi-isotropic sequence ([90/45/-45/90/0]S) and open-hole geometry is studied using a multiscale method [1]. On the one hand, the intra-laminar failure is captured using a damage-enhanced mean-field homogenization scheme. To this end, each ply is modeled as a homogenized material whose anisotropic damage behavior is captured from the homogenization method [2]. In order to avoid the problem of loss of solution uniqueness the mean-field homogenization process is formulated in the context of the non-local continuum damage theory [3]. On the other hand, an hybrid discontinuous Galerkin/extrinsic cohesive law method is used to model the delamination process at the ply interfaces. This hybrid method avoids the need to propagate topological changes in the mesh with the propagation of the delamination while it preserves the consistency and stability in the un-cracked interfaces. As a result, the multiscale framework allows predicting damage propagation directions in each ply along the fiber directions accordingly to the experimental results as it is demonstrated by considering an openhole [90/45/-45/90/0]S-laminate studied both numerically and experimentally. [1] L. Wu, et al., Composite Struct., 126, 246–264, 2015. [2] L. Wu, L. Noels, L. Adam, I. Doghri, Int. J. of Solids and Struct., 50, 3843-3860, 2013. [3] R. Peerlings, et al., Int. J. for Numer. Meth. in Eng., 39, 3391-3403, 1996 [less ▲]

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See detailRevers lifté et coup droit "à plat" : le (néo)libéralisme en débat
Delvenne, Pierre ULg; Rossignol, Nicolas ULg

Article for general public (2016)

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See detailCatalytic reforming of biomass gasification tars with bi- or tri-doped catalysts optimized with organosilane precursors
Claude, Vincent ULg; Courson, Claire; Heinrichs, Benoît ULg et al

Conference (2016, June 08)

The thermochemical method called “biomass gasification” is generating emphatic interest for the production of bio-Syngas (CO + H2) since this process presents the advantage of being renewable without ... [more ▼]

The thermochemical method called “biomass gasification” is generating emphatic interest for the production of bio-Syngas (CO + H2) since this process presents the advantage of being renewable without emitting CO2. However, in practical applications, there are still some technical problems due to high tars concentration in the outlet gas which can condensate and clog the pipes. Many studies have highlighted the fact that the tar elimination via catalytic reforming seem to be the more practical and economical solution. The required properties of the catalysts are determined by its location: inside the reactor (primary catalyst) or outside of the reactor (secondary catalyst). Primary catalysts are generally robust, non-toxic, cheap and they are almost uniquely destined to fluidized bed reactors. Secondary catalysts can be used at the exit of both fluidized and fixed bed reactors. They are characterized by a tailored mesoporous shape, a controlled active site dispersion and an adapted elemental composition [1]. In this work , we decided to focus on designing materials for secondary catalytic applications, i.e. working at relatively low temperature (~650°C) with no mechanical stress. The supports were made of γ-Al2O3 synthesized via an easy Sol-Gel method. During their synthesis, these supports were doped with 10%wt of nickel and various combinations of metallic dopants (Co, Cu, Fe, Mn, Mo) in the aim of enhancing their catalytic activities and lifetime. [less ▲]

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See detailAg/SiO2 and Cu/SiO2 cogelled xerogel catalysts for benzene combustion and 2-butanol deshydrogenation
Mahy, Julien ULg; Claude, Vincent ULg; Tasseroul, Ludivine ULg et al

Poster (2016, June 08)

Tars are recognized as major impurities when biomass is gazified into Syngas (mixture CO + H2) or when the methane reforming was produced from sustainaible reagents [1]. Therefore, fundamental knowledge ... [more ▼]

Tars are recognized as major impurities when biomass is gazified into Syngas (mixture CO + H2) or when the methane reforming was produced from sustainaible reagents [1]. Therefore, fundamental knowledge of catalytic oxidation and deshydrogenation mechanisms can be valuable to develop effective methods to control syngas or methane pollution. A very important concern about cogelled catalysts is the accessibility of the active centers. Because the silver and copper is located inside silica particles, there is a risk that it may not be accessible. In the case of benzene oxidation, it was observed that the specific activity (mol s-1 g-1Ag) of Ag/SiO2 and Cu/SiO2 catalysts increases when the silver or copper loading decreases (Fig. 1). In fact, visual observations by TEM showed that in samples Ag0.25, Ag0.45, Ag1.05 and Cu1.00, there are not silver or copper particles located on silica particles external surface and then the metal dispersion values are greater in these samples. So, it is the proof that Ag and Cu particles located inside the silica particles are accessible for benzene in this catalytic system. In the case of 2-butanol dehydrogenation, the specific activity of Cu/SiO2 catalysts increases when the copper loading increases or when the metal dispersion values decreases (Fig. 2). However, in Cu1.00 sample, copper particles inside silica particles only are observed by TEM. It seems that these metallic particles are accessible for 2-butanol in this catalytic system. [less ▲]

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See detailMise en œuvre de l’approche par compétences en tension
Georges, François ULg; Homburg, David ULg; Poumay, Marianne ULg

Conference (2016, June 08)

De nombreux établissements d’enseignement supérieur s’engagent dans la réforme de leurs cursus selon une approche par compétences (APC). Dans le meilleur des cas, ces réformes s’ancrent dans des contextes ... [more ▼]

De nombreux établissements d’enseignement supérieur s’engagent dans la réforme de leurs cursus selon une approche par compétences (APC). Dans le meilleur des cas, ces réformes s’ancrent dans des contextes porteurs. Elles sont soutenues par la direction et le corps professoral. Le monde professionnel les encourage. Des équipes guidées par des conseillers pédagogiques sont constituées pour les mettre en œuvre. Malgré ce contexte porteur, force est de constater que la mise en œuvre de l’APC se heurte régulièrement à une série de tensions nées de l’opposition entre plusieurs valeurs. L’institution est ainsi tiraillée entre son souhait de répondre rapidement aux conditions d’accréditation et sa volonté de prendre le temps de réformer en profondeur ses cursus. Les enseignants sont quant à eux tiraillés entre la volonté de mieux préparer les étudiants au monde professionnel et leurs difficultés à penser autrement leurs cours et leurs évaluations (Scallon, 2015). Les étudiants sont eux-mêmes tiraillés entre leur intérêt pour une approche centrée sur leur progression et leur envie de réussir à moindres frais. Toutes ces tensions se nourrissent par ailleurs de représentations sur ce qu’est apprendre ou encore sur qu’est une bonne université, un bon enseignant, un bon étudiant et un bon professionnel. Les étapes clés qui président à l’édification d’un référentiel compétences (Tardif, 2006) serviront de fil rouge à notre présentation. Pour chacune de ces étapes (choix des compétences, des composantes essentielles, des situations professionnelles, des niveaux de développement, des apprentissages critiques et des ressources), nous illustrerons les tensions rencontrées par des équipes éducatives à travers l’exemple de HEC-Ecole de gestion de l’université de Liège et d’autres équipes engagées dans ce type de réforme. [less ▲]

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See detailUne charte en six principes pour guider la mise en œuvre des programmes visant le développement de compétences dans l’enseignement supérieur
Poumay, Marianne ULg; Scheffers, Patricia ULg; Georges, François ULg

Conference (2016, June 08)

Dans l’enseignement supérieur, les programmes se structurent de plus en plus autour de référentiels de compétences, que ces derniers constituent des prescrits légaux ou des choix institutionnels. Mais la ... [more ▼]

Dans l’enseignement supérieur, les programmes se structurent de plus en plus autour de référentiels de compétences, que ces derniers constituent des prescrits légaux ou des choix institutionnels. Mais la cohérence entre le référentiel et le programme est parfois mince. Il arrive en effet que les contraintes de terrain prennent le pas sur les intentions de changement, rendant impossible une réelle « approche visant le développement de compétences » (APC). Force est aussi de constater combien il est complexe de dériver un programme cohérent au départ d’un référentiel de compétences. Pour aider les équipes enseignantes, lors de la refonte d’un programme, à garder le cap sur la notion de compétence telle que définie par Tardif (2006), le LabSET a élaboré une charte en six principes. Cette charte a été utilisée par une dizaine d’équipes libanaises et égyptiennes dans le projet ADIP, lors de la construction de quatre Masters. Les six principes y ont été assortis de recommandations qui président à leur mise en œuvre concrète et serviront de points de repères lors de l’évaluation des programmes. Notre communication partira de ces six principes et de leurs fondements théoriques. Elle explicitera ensuite leur adaptation aux programmes de banque-finance de deux universités libanaises, à travers leur traduction en recommandations concrètes. Elle les illustrera enfin par le cas des architectes de l’ULg, soulignant notamment parmi ces principes ceux qui semblent les plus complexes à mettre en œuvre. [less ▲]

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See detailIntegrated and systemic management of storm damage by the forest-based sector and public authorities
Riguelle, Simon ULg; Hebert, Jacques ULg; Jourez, Benoît ULg

in Annals of Forest Science : a Multidisciplinary and International Journal (2016), 73

The paper’s goals are to identify key challenges in the currentwindthrow management framework and present a blueprint for howto progress in the settlement of regional strategies.SWOT analyses are used to ... [more ▼]

The paper’s goals are to identify key challenges in the currentwindthrow management framework and present a blueprint for howto progress in the settlement of regional strategies.SWOT analyses are used to highlight relevant issues and opportunities in classical approaches from both the forest-based sector and public authorities’ perspectives. Despite the large body of knowledge that allows decision-makers to react promptly after huge storms, strategic responses still suffer from too individual and fragmented decisions and a lack of holistic economic assessments. To tackle these issues, the paper suggests using systemic and integrated risk management approaches. It also presents the ways to enhance the forest-based sector’s resistance and resilience towards economic shock and supports decision-making with the help of systemic analysis. This shift of paradigm is one of the key requirements in optimizing the way of dealing with storm damage, but public authorities should concur with it more actively by improving decisional and administrative frameworks. Contribution of the co-authors Co-authors are PhD thesis’ supervisors and have thoroughly reviewed the paper. [less ▲]

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See detailAménorhée primaire : le point de vue endocrinien
VALDES SOCIN, Hernan Gonzalo ULg

Scientific conference (2016, June 07)

Aménorhhée primaire : le point de vue endocrinien Dr Hernan Valdés-Socin Chef de Clinique. Service d’Endocrinologie. CHU de Liège Résumé L’alternance de la phase folliculaire et lutéale ovarienne ... [more ▼]

Aménorhhée primaire : le point de vue endocrinien Dr Hernan Valdés-Socin Chef de Clinique. Service d’Endocrinologie. CHU de Liège Résumé L’alternance de la phase folliculaire et lutéale ovarienne, s’accompagne d’une variation de la sécrétion oestroprogestative déterminant le cycle menstruel de l’utérus. Les différentes perturbations pouvant toucher les circuits hypothalamiques (neurones à kisspeptines, neurones a GnRH), le fonctionnement hypophysaire et son contrôle des différentes glandes endocrines, les anomalies acquises et génétiques des ovaires (syndrome de Turner, insuffisance ovarienne primaire,etc) et de l’utérus (syndrome d’Asherman, Syndrome de Rokytanski, etc) peuvent déterminer selon les cas une aménorrhée primaire ou secondaire. L’aménorrhée primaire est définie par l’absence de ménarche chez une fille arrivée à l’âge de 16 ans alors que l’aménorrhée secondaire est l’absence de menstruation depuis plus de 3 mois, chez une patiente antérieurement bien réglée. Nous discutons et résumons ici les différentes étiologies d’aménorrhée primaire et secondaire, ainsi que leur prise en charge. La disponibilité récente au CHU de Liège d’un panel de 16 gènes responsables d’hypogonadisme hypogonadotrope nous a permis d’approfondir la recherche sur les causes du syndrome de Kallmann et de l’hypogonadisme hypogonadotrope normosmique. Références H. Valdes-Socin , F.G. Debray, A.S. Parent, M.C. Lebrethon, J.P. Bourguignon, V. Bours A. Beckers. Comment je diagnostique un hypogonadisme hypogonadotrope congénital isolé? Rev Med Liège 2010 Nov;65(11):634-41 Valdes-Socin H, Rubio Almanza M, Tomé Fernández-Ladreda M, Debray FG, Bours V, Beckers A. Reproduction, Smell and Neurodevelopmental disorders: Genetic defects in different hypogonadotropic hypogonadal syndromes. Frontiers in Endocrinology 2014 (5) 109 1-8. Valdes-Socin H, Beckers A. El síndrome de Pasqualini. Medicina (B Aires). 2015;75(1):53-8. B. González Aguilera, P. Syrios, R. Gadisseur, F. Luyckx, E. Cavalier, A. Beckers, H. Valdes-Socin. Persistent low levels of serum hCG due to heterophilic mouse antibodies: an unrecognized pitfall in the diagnosis of trophoblastic disease. Gynecology Endocrinology 2015 Jun;32(6):439-41. H. Valdes-Socin, Fg. Debray, C. Libioulle, A. Pintiaux, As. Parent, V. Corman, K. Gellner, V. Geenen, L. Vroonen, V. Dideberg, V. Bours, A. Beckers. Caractérisation clinique, neuroendocrinienne, génétique et résultats thérapeutiques dans le syndrome de Kallmann et de l’hypogonadisme normosmique idiopathique: expérience liégeoise. Annales d'Endocrinologie - 32ème congrès de la société Française d'Endocrinologie 2016. Bordeaux. France. H. Valdes-Socin (Dr), A. Verloesb , Fg. Debrayc , C. Libioullec , A. Pintiauxd , P. Maquet, A. Beckers) Le Syndrome de De Morsier : une cause congénitale méconnue d’hypopituitarisme. Annales d'Endocrinologie - 32ème congrès de la société Française d'Endocrinologie 2016. Bordeaux. France [less ▲]

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See detail50Hz EMF and public health policy: The involvement of the Belgian BioElectroMagnetics Group
Ledent, Maryse ULg; Maes, Annemarie; De Ridder, Maurits et al

Poster (2016, June 07)

The BBEMG website (www.bbemg.be) aims to present the results of the research teams of the Belgian BioElectroMagnetics Group, to inform about electric and magnetic fields and their potential health effects ... [more ▼]

The BBEMG website (www.bbemg.be) aims to present the results of the research teams of the Belgian BioElectroMagnetics Group, to inform about electric and magnetic fields and their potential health effects, and to become a centre of documentation and education able to provide understandable and correct information regarding 50 Hz electric and magnetic fields to the general public, physicians, scientists, public officials... This paper is focusing on the involvement of the BBEMG through its website in the Belgian public policy, its identified goals and how it is implemented and evaluated. Challenges will also be analysed. [less ▲]

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See detailMultifractal analysis of the divergence of wavelet series
Esser, Céline ULg

Conference (2016, June 07)

In this talk, we study pointwise divergence properties of wavelet expansions of functions in a given Besov space. We obtain deterministic upper bounds for the Hausdorff dimensions of the sets of points ... [more ▼]

In this talk, we study pointwise divergence properties of wavelet expansions of functions in a given Besov space. We obtain deterministic upper bounds for the Hausdorff dimensions of the sets of points where a given rate of divergence is observed, and we show that these bounds are generically (in the sense of Baire's categories) optimal. This gives a complement to the works done by F. Bayart and Y. Heurteaux in the case of Fourier series and by J.M. Aubry. [less ▲]

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