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See detailFingerprinting and validation of a LC-DAD method for the analysis of biflavanones in Garcinia kola-based antimalarial improved traditional medicines
Tshisekedi Tshibangu, Pascal ULg; Mutwale Kapepula, Paulin ULg; Kabongo Kapinga, Marie Josée et al

in Journal of Pharmaceutical and Biomedical Analysis (2016), 128(2016), 382-390

African populations use traditional medicines in their initial attempt to treat a range of diseases. Nevertheless, accurate knowledge of the composition of these drugs remains a challenge in terms of ... [more ▼]

African populations use traditional medicines in their initial attempt to treat a range of diseases. Nevertheless, accurate knowledge of the composition of these drugs remains a challenge in terms of ensuring the health of population and in order to advance towards improved traditional medicines (ITMs). In this paper chromatographic methods were developed for qualitative and quantitative analyses of a per os antimalarial ITM containing Garcinia kola. The identified analytical markers were used to establish TLC and HPLC fingerprints. G. kola seeds were analysed by HPLC to confirm the identity of the extract used by the Congolese manufacturer in the ITM. The main compounds (GB1, GB2, GB-1a and Kolaflavanone) were isolated by preparative TLC and identified by UPLC–MS and NMR. For the quantification of the major compound GB1, a simple and rapid experimental design was applied to develop an LC method, and then its validation was demonstrated using the total error strategy with the accuracy profile as a decision tool. The accurate results were observed within 0.14–0.45 mg/mL range of GB1 expressed as naringenin. The extracts used in several batches of the analysed oral solutions contained GB1 (expressed as naringenin) within 2.04–2.43%. Both the fingerprints and the validated LC-DAD were found suitable for the quality control of G. kolabased raw material and finished products, respectively. [less ▲]

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See detailStimulation économique : promenade dans le champ des possibles pour l'Etat belge
Behrendt, Christian ULg

Conference given outside the academic context (2016)

Conférence prononcée à la Chambre de commerce et d'industrie du Luxembourg belge, Libramont, 9 juin 2016

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See detailFunctional analysis of PEBP genes in root chicory (Cichorium intybus)
Saintmard, Nicolas ULg; Tocquin, Pierre ULg; Périlleux, Claire ULg

Poster (2016, June 09)

Manipulating plant architecture is key to increase crop yield. In this perspective, basic knowledge on the molecular mechanisms regulating plant growth and development will be fundamental for the future ... [more ▼]

Manipulating plant architecture is key to increase crop yield. In this perspective, basic knowledge on the molecular mechanisms regulating plant growth and development will be fundamental for the future of agriculture. Recent progress indicates that a family of plant genes, homologous to POSPHADITYLETHANOLAMINE-BINDING PROTEINS (PEBP) in other eukaryotes, plays critical roles in controlling shoot development traits such as branching, flowering, bud dormancy or tuberization. Very little is known however on the functions of these genes in root development. The current research will attempt to answer this question in the case of Cichorium intybus, a biannual plant cultivated for the extraction of inulin (a polymer of fructose) from its root. Functional analyses will include expression kinetics, complementation tests in Arabidopsis mutants and creation of PEBP- overexpressing or silencing chicory plants. The preliminary steps of the project are the identification of PEBP genes in chicory by in silico analyses, the determination of the time of the storage root initiation and the establishment of a regeneration protocol for the genetic transformation. [less ▲]

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See detailPromote physical activity and reduce ageism across generations: effects of an intergenerational program
Mouton, Alexandre ULg; Heldenbergh, Corentin ULg; Flamion, Allison ULg et al

Conference (2016, June 09)

Introduction From early to later age populations, regular physical activity (PA) could be considered as a key behaviour to struggle against the major health, mental, social and economic issues of the 21st ... [more ▼]

Introduction From early to later age populations, regular physical activity (PA) could be considered as a key behaviour to struggle against the major health, mental, social and economic issues of the 21st century (Rippe & Angelopoulos, 2010). Among PA interventions, international scientific statements recommend an emerging approach targeting specific intergenerational dyads, such as grandparent-grandchild pairs (Marcus et al., 2006). Besides, Ory and colleagues (2003) underlined that intergenerational interactions could also combat aging stereotypes across generations. Accordingly, the aim of this study was to examine the effects of an intergenerational PA program on PA behaviours and aging stereotypes of grandparent-grandchild pairs. Methods Intergenerational grandparent-grandchild pairs were recruited in two Belgian municipalities. Those two groups took part in a three-month intergenerational intervention, adapted from a previous intervention (Mouton, Renier & Cloes, 2015) and including one weekly session of PA. Assessments were performed before (T0), during (process analysis) and after the intervention (T1). Grandparents PA was assessed with the QAPPA and the SF-36 questionnaires and with a battery of physical fitness test (SFT). The UCLA loneliness scale was also administrated to seniors. Grandchildren PA was evaluated with a seven items Likert scale. Relationship quality and ageism stereotypes between generations were assessed using a combination of existing validated instruments. Results and conclusions The intergenerational groups were composed of 14 dyads of grandparent (65±3.2 years)-grandchild (8.8±2.3 years) in one municipality and 6 dyads of grandparent (64±4.5 years)-grandchild (7.7±1.3 years) in the second. By its combination of physical and psychosocial objectives, the results of this study are expected to provide a significant and original contribution to the research field. If intergenerational PA has the potential to reduce ageism, it could pave the way to interdisciplinary interventions among physical education professionals. [less ▲]

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See detailPour une architecture durable en République Démocratique du Congo. Animation d'ateliers.
Frankignoulle, Pierre ULg

Scientific conference (2016, June 09)

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See detailThe Liège Game Lab: presentation of a young research center on videogames
Dozo, Björn-Olav ULg; Barnabé, Fanny ULg; Delbouille, Julie ULg et al

Conference (2016, June 09)

The main goals of the paper are, first, to present the Liège Game Lab, the different studies carried out in Liège on videogames and their specificities and, secondly, question our own position in the ... [more ▼]

The main goals of the paper are, first, to present the Liège Game Lab, the different studies carried out in Liège on videogames and their specificities and, secondly, question our own position in the research field. To do so, we will situate ourselves in relation to the main paradigms of game studies dominated in France by social sciences and in the world by English-speakers, with a particular attention to the domination’s concerns of a peripheral position. This paper will focus on presentation and discussion of the videogames’ study in a midsized French speaking University. The aim is, first and foremost, to question the domination’s issues related to a triple peripheral position: geographic, methodological and linguistic. - The University of Liège is indeed peripheral in Belgium, in comparison to the centrality, geographically speaking, of the Universities of Brussels and Leuven. - The main group working on videogames, in French speaking Belgium, is the LabJMV (the “Games and Virtual Worlds” Laboratory), where the anthropological and sociological perspectives are dominant, while in Liège we developed more a communicative and literary outlook. - The OMNSH (the main association about game studies in France), which could be our “natural” link to the field because of the sharing language, is also dominated by social sciences and separated by a political frontier which could be seen as a boundary. - The DIGRA (the Digital Games Research Association), at the opposite, is geographically close to us (given that they are present as a chapter in Flanders), but disconnected owing to the difference of language (they publish mainly in English, we publish mainly in French). Despite of this peripheral position and making of it a strategic observatory of the tendencies of game studies, an original research hub emerged in Liège for two years. We chose to work on objects and/or with methodological perspectives which diverge of mainstream game studies: amateur game making, videogame press, Belgian players’ uses and poetical perspective on gaming practices. Various contingencies brought together at the University of Liège several researchers working more or less directly on videogames: students’ demands to write master’s thesis on videogames, the rise of grants from funding agencies like FNRS to study this medium and the development of Digital Humanities in the University of Liège. It is time, now, to question ourselves about the situation of the game studies in the University of Liège, but also the place of this University in the international field of this discipline. In first approximation, we can postulate that this gathering of researchers generated a shared research process, whose specificities stem particularly from the triple peripheral position (geographic, methodological and linguistic) of the University of Liège in the game studies field – as explained earlier. However, we would like to discuss this hypothesis not only on our own,but publicly, in the context of an international conference. Consequently, with this paper, we aim to present our group questioning our shared position and, at the same time, to expose a comparison of our five perspectives on videogames in order to understand in what ways they match each other and in what ways they create fruitful opposition. Björn-Olav Dozo and Boris Krywicky are interested in French speaking videogame press with book history’s methods. Pierre-Yves Hurel examines amateur game design with sociological tools (the dominant methodology in French speaking game studies), but these are serving communication and political investigations. Fanny Barnabé studies the same kind of objects (players’ creative practices of “misappropriation”), but through a formal and poetic approach (she analyzes the works so produced and not the players’ activities). Julie Delbouille, at the opposite, adopted a sociological and quantitative methodology, but investigated a restricted category of gaming practices: the French speaking Belgian players. [less ▲]

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See detailTwo novel ways to impose free-slip boundary conditions in fluid-structure interaction problems using the Particle Finite Element Method
Cerquaglia, Marco Lucio ULg; Deliège, Geoffrey ULg; Boman, Romain ULg et al

Conference (2016, June 09)

As well known, the imposition of boundary conditions is, in many cases, the trickiest part in solving differential problems, both from a physical and numerical standpoint. This work focuses on the way ... [more ▼]

As well known, the imposition of boundary conditions is, in many cases, the trickiest part in solving differential problems, both from a physical and numerical standpoint. This work focuses on the way boundary conditions are accounted for in the solution of fluid-structure interaction problems using the Particle Finite Element Method (PFEM). In particular, the PFEM traditionally employs no-slip conditions on the fluid-solid interfaces. Our aim is twofold. On the one hand, we demonstrate that, in the framework of the PFEM, the no-slip hypothesis is too strong in some cases, leading to erroneous physical results, and that a free-slip condition is to be preferred instead; we therefore propose two novel ways to impose free-slip conditions, devoting special attention to generality, simplicity and robustness. On the other hand, we show how the use of free-slip boundary conditions can also be beneficial with regards to two major problems arising from the remeshing procedure employed by the PFEM: the violation of the mass conservation principle and the introduction of spurious pressure oscillations. [less ▲]

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See detailComplete coding sequence of one H9 and three H7 low pathogenic influenza viruses circulating in wild birds in Belgium, 2009-2012
Van Borm, Steven; Rosseel, Toon; Marché, Sylvie et al

in Genome Announcements (2016), 4(3),

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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 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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