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See detailEffects of High Solidification Rates on Segregations and Solid Phase Transformations in High Speed Steels
Tchuindjang, Jérôme Tchoufack ULiege; Sinnaeve, Mario; Lecomte-Beckers, Jacqueline ULiege

in MATSUBARA, Yasuhiro; SASAGURI, Nobuya; YAMAMOTO, Kaoru (Eds.) ABRASION 2017 - The 6th International COnference on Abrasion Wear Resistant Alloyed White Cast Iron for Rolling and Pulverizing Mills (2017, August)

High Speed Steels (HSS) represent high alloyed steels that belong to the complex Fe-Cr-C-X system whit X being a strong carbide forming element such as V, Nb, Mo or W. During the solidification of HSS ... [more ▼]

High Speed Steels (HSS) represent high alloyed steels that belong to the complex Fe-Cr-C-X system whit X being a strong carbide forming element such as V, Nb, Mo or W. During the solidification of HSS, segregations corresponding to preferential distribution of elements can occur. Segregations are influenced both by the initial chemical composition and by the casting route, which is the case with conventional spin casting process. But the same phenomenon should also exist with the expanding additive manufacturing techniques that involved higher thermal gradients and higher cooling rates compared to classical processes. The solid phase transformations are controlled by the local concentrations of elements, especially the supersaturation which may exist in certain regions. That is the reason why the segregations inherited from the solidification of the HSS alloys lead to unexpected solid state phase transformations during the ongoing cooling stage. These phase transformations may occur either in the moderate temperature range or subsequently in the lower temperature range which is close to the ambient temperature, as for the martensitic transformation. In the present work a general review of the literature dealing with the fundamentals of solidification is reviewed aiming at justifying the need to search for tools that will be more adapted to simulate or study the microstructures obtained by manufacturing processes such as laser cladding, which refer to conditions far away from equilibrium. The new approach to understanding non-equilibrium structures also requires consideration of related studies with materials that are different from the HSS alloys, such as stainless steels, in order to take advantage of relevant analyzes that have already been achieved in other areas. The study is open, because the scope of the analyses is large and it can be extend to the phase transformations and also to the properties. Some relevant results obtained on two HSS processed by laser cladding are discussed related to the solidification mode and the solidification sequence. [less ▲]

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See detailLe vocabulaire des archives des cités grecques : l’apport de l’épigraphie. Le cas des termes ἀποδέκτης et ἀποδοχεύς
Dolne, Laëtitia ULiege

Poster (2017, August)

Ce poster est issu d’un projet de thèse récemment débuté à l’Université de Liège et consacré à l’étude du vocabulaire technique des différents aspects de l’archivage dans les cités grecques antiques. Un ... [more ▼]

Ce poster est issu d’un projet de thèse récemment débuté à l’Université de Liège et consacré à l’étude du vocabulaire technique des différents aspects de l’archivage dans les cités grecques antiques. Un des objectifs du projet est de réaliser un lexique systématique, exhaustif et raisonné, fondé sur une analyse approfondie et contextualisée des sources littéraires, épigraphiques et papyrologiques grecques et latines de c. IIIe s. av. J.-C. à c. IIIe s. apr. J.-C. Une fois achevé, le lexique facilitera pour tous l’accès aux sources de l’activité archivistique ancienne et, de ce fait, sa compréhension et son étude dans un cadre plus global. En effet, la lecture de ces sources est entravée par la diversité et la technicité des termes qui y abondent et peuvent avoir, selon le contexte, mais aussi le lieu et l’époque, des acceptions différentes, et donc désigner des réalités distinctes. Le poster illustre cette problématique, ainsi que la méthodologie employée dans le projet, par l’exemple des termes ἀποδέκτης et ἀποδοχεύς. Alimenté principalement par la documentation épigraphique, le cas de figure choisi montre également l’important apport de cette discipline pour la réalisation d’un tel lexique. [less ▲]

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See detailVoice use among music theory teachers
Schiller, Isabel ULiege; Morsomme, Dominique ULiege; Sfez, Lou et al

Conference (2017, August)

In Belgium, there is a particular group of music teachers referred to as music theory teachers. Working at music schools, they convey theoretical knowledge and practical musical skills to groups of ... [more ▼]

In Belgium, there is a particular group of music teachers referred to as music theory teachers. Working at music schools, they convey theoretical knowledge and practical musical skills to groups of individuals who learn music during their free-time. Even though music theory teachers use both speaking and singing voice intensively at work, little is known about their voice use profiles. This study investigated the vocal loading among French-speaking music theory teachers. Objectives were (1) to describe their professional and extra-professional vocal loading, (2) to determine the relationship between vocal loading and background noise level and (3) to investigate whether objectively measured vocal loading is reflected in music theory teachers’ auto-evaluation of their voice. Using voice dosimetry, 13 music theory teachers were monitored for one workweek. Parameters analysed were F0, voice sound pressure level (SPL), phonation time, vocal loading index (VLI) and background noise SPL. At the end of each monitoring day, subjects self-assessed their voice use by means of visual analogue scales. Results revealed (1) significantly higher vocal loading in the professional context than in the extra-professional context, (2) significant positive correlations between background noise level and the parameters F0, voice SPL and phonation time and (3) significant correlations between the VLI and auto-evaluation data (e.g. voice quality and vocal fatigue). These results highlight that teaching music theory is a profession with high vocal demands. At work, music theory teachers are exposed to high background noise, which seems to influence their voice use and may potentially contribute to the development of voice problems among this population. Visual analogue scales provide a promising tool to subjectively investigate vocal loading among music theory teachers. [less ▲]

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See detailLEARNING CHEMICAL KINETICS AT SECONDARY SCHOOL LEVEL: MISCONCEPTIONS AND ALTERNATIVE APPROACH
Karous, Hamad ULiege; Nihant, Brigitte ULiege; Leyh, Bernard ULiege

Conference (2017, August)

Chemical kinetics occupies a central position in describing and understanding the dynamic behaviour of matter. It is then expected that this topic shares a significant part in the teaching curricula ... [more ▼]

Chemical kinetics occupies a central position in describing and understanding the dynamic behaviour of matter. It is then expected that this topic shares a significant part in the teaching curricula. Nevertheless, the review of the scarce literature on the topic reveals that little is usually invested to adequately include this field in the major programs. Most studies demonstrate that the teaching approaches in chemical kinetics often remain limited to the qualitative macroscopic description and do not identify the necessary relevant links between the macroscopic and the submicroscopic scales. Consequently, low levels of conceptual understanding and many misconceptions can be identified at the students’ level. Based on the constructivist approach in which the learners build their own cognitive structure, a new teaching sequence including qualitative and quantitative aspects of chemical kinetics for secondary school students (15-17 years old) is proposed. This teaching sequence allows the students to develop an ability to use corpuscular models as explanatory tools as well as an adequate conceptual understanding of chemical kinetics. This approach integrates visualization tools along with active learning strategies using, e.g., interactive websites. [less ▲]

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See detailAs teorias semióticas face à fotografia
Dondero, Maria Giulia ULiege

in Calavari, Suzi; Rodrigues, Angelica; Rocha, Nildicéia (Eds.) Proceedings VI SELIN – NOVAS PRÁTICAS EM PESQUISA SOBRE A LINGUAGEM: ROMPENDO FRONTEIRAS (2017, August)

Dans ce texte, je me propose de revenir sur les travaux en sémiotique qui ont marqué les études du champ interdisciplinaire de la photographie et de les poursuivre; l’objectif principal est de fournir ... [more ▼]

Dans ce texte, je me propose de revenir sur les travaux en sémiotique qui ont marqué les études du champ interdisciplinaire de la photographie et de les poursuivre; l’objectif principal est de fournir quelques pistes pour étudier, d’un point de vue sémiotique, l’image photographique en tant qu’objet pris dans des pratiques d’usage et d’interprétation diversifiées au sein des statuts sociaux de l’art, de la science, de la religion. [less ▲]

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See detailLegal, official, academic and "trading" norms in higher DRC's education
Poncelet, Marc ULiege

Conference (2017, July 31)

Rule of legal, official, practical norms in DRC university

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See detailHigh School Sport in Belgium (Wallonia)
Cloes, Marc ULiege

Conference (2017, July 31)

In Belgium, since 1969, sport is a competence under the control of public authorities defined according to the linguistic regime. As in most Western European countries, sport has been compartmentalised by ... [more ▼]

In Belgium, since 1969, sport is a competence under the control of public authorities defined according to the linguistic regime. As in most Western European countries, sport has been compartmentalised by giving rise to three main types of practice: "professional", "traditional" and "alternative" sports (Diegel, 1995). Clubs linked to sports federations constitute the local setting up of the sports organization, which is largely a majority (Zintz, 2014). Other operators from the public domain and the private sphere coexist (Cloes, 2012). In the school environment, sport can be found in three contexts: within the compulsory curriculum (physical education), integrated to extracurricular activities (activities organized during recess or free periods), and peripheral activities (use of school sports facilities by organizers who are not belonging to the school actors). If inter-school competitions are organized by several school sports federations (depending to the educational network), they are far from reaching the interest and involvement reached by the competitions managed by the traditional sports federations. So there is hardly any systematic sports training in French-speaking Belgian schools. Some PE teachers propose voluntary training sessions but there are less and less connections between their actions and sport clubs. On the other hand, young sportsmen appointed by the Minister of Sports have a special status enabling them to benefit facilities to pursue their double career. They are sometimes gathered in special organizations - sport-studies or development centers - which have been the subject of several studies (Cloes et al., 2002, Lacrosse et al., 2014, Theunissen et al., 2016) but PE teachers are very few involved in these development opportunities. In many situations of partnership between the school and sports structures, their role is often limited to a simple accompanying action (sports days, projects "My club-My school." Cloes (2017) insisted however on the need to make them a priority in the coordination of the preparation of physically educated citizens. References Cloes, M. (2012). La Wallonie en mouvement : vers une culture sportive et de l’activité physique ? In, M. Germain et R. Robaye (Eds.), L'état de la Wallonie. Portrait d'un pays et de ses habitants – 2011. (pp. 70-80). Namur : Les éditions namuroises. Available on Internet : http://hdl.handle.net/2268/117294 Cloes, M. (2017). Preparing physically educated citizens in physical education. Expectations and practices. Retos, 31, 245-251. Available on Internet : http://recyt.fecyt.es/index.php/retos/article/view/53497/32304 Cloes, M., Schelings, V., Ledent, M, & Piéron, M. (2002). Sport-études : comparaison des caractéristiques motivationnelles et des relations sociales des élèves sportifs et de leurs condisciples. eJRIEPS (e Journal de la Recherche sur l'Intervention en Éducation Physique et Sport), 1, 57-72. Available on Internet: http://hdl.handle.net/2268/10187 Diegel, H. (1995). Sport in changing society – Sociological essays. Schorndorf: Verlag Karl Haufmann. Lacrosse, Z., Martin, V., & Cloes, M. (2014, July). Analyse qualitative du fonctionnement du centre de formation d’une fédération sportive. Paper presented at the 8ème biennale de l’ARIS ‘Temps, temporalités et intervention en EPS et en sport’, Genève, Suisse. Available on Internet: http://hdl.handle.net/2268/170020 Theunissen, C., Meys, G., & Cloes, M. (2016). Encadrement du staff autour du double projet des sportifs dans un centre de formation en handball. Revue de l’Éducation physique, 56, 1/2, 20. Disponible sur Internet: http://yessport.be/educationphysique/file/REVUE_1_ET_2_2016_-2eme_COLLOQUE_GUY_NAMUROIS.pdf ou http://orbi.ulg.ac.be/handle/2268/199016 Zintz, T. (2014). Module 3 - Le paysage sportif : du pratiquant aux fédérations. Thématique 1 - Cadre institutionnel et législatif. Cours généraux de la formation ‘Moniteur Sportif Initiateur’. Brussels, Belgium : Administration des sports, Fédération Wallonie-Bruxelles. Internet : http://www.sport.cfwb.be/index.php?id=7370 [less ▲]

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See detailThermoelectric properties of heavily-doped Fe2YZ full-Heusler compounds
Lemal, Sébastien ULiege; Ricci, Fabio ULiege; Verstraete, Matthieu ULiege et al

Poster (2017, July 31)

Fe2YZ full-Heusler compounds were recently predicted to exhibit very large thermoelectric power factors [Phys. Rev. Lett. 114, 136601 (2015)]. Combining first-principles density functional theory ... [more ▼]

Fe2YZ full-Heusler compounds were recently predicted to exhibit very large thermoelectric power factors [Phys. Rev. Lett. 114, 136601 (2015)]. Combining first-principles density functional theory calculations within a hybrid functional approach and Boltzmann semi-classical transport theory, we investigate the limits of the rigid band doping approximation, and the properties of heavily n-type doped full-Heusler Fe2YZ1-xAx compounds. Using a supercell approach and including explicit dopant impurities, we recover in some cases giant thermoelectric power factors, as previously predicted within the rigid band approximation. In others the effect on the electronic structure is very different from rigid shifts. Interestingly, we find that some systems present a magnetic instability consistent with the Stoner model, and evolve towards a ferromagnetic half-metallic ground state, with a strongly modified power factor. Our results show the promise of the heavily-doped phases of the studied Fe2YZ1-xAx compounds for Seebeck and spin-dependent Seebeck applications. [less ▲]

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See detailDynamicized semantic maps of content words. Comparing long-term lexical changes in Ancient Egyptian and Greek
Georgakopoulos, Athanasios ULiege; Polis, Stéphane ULiege

Conference (2017, July 31)

This paper aims at demonstrating how information on the paths of semantic extensions undergone by content words may be incorporated into semantic maps. For this purpose, particular changes that affected ... [more ▼]

This paper aims at demonstrating how information on the paths of semantic extensions undergone by content words may be incorporated into semantic maps. For this purpose, particular changes that affected the meanings of words in the course of the Ancient Egyptian and of the Ancient Greek language history are investigated. [less ▲]

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See detailEl impacto del fin del “giro al la izquierda” sobre las relaciones entre China y América Latina
Wintgens, Sophie ULiege

Conference (2017, July 28)

La llegada de China en América Latina a finales de los años 2000 se ha presentado como una nueva opción en el contexto histórico de un “movimiento pendular” que siempre ha visto los países latino ... [more ▼]

La llegada de China en América Latina a finales de los años 2000 se ha presentado como una nueva opción en el contexto histórico de un “movimiento pendular” que siempre ha visto los países latino-americanos girar principalmente en torno a Europa y sus antiguas potencias coloniales o en torno a los Estados Unidos. En el marco de esa dinámica del “triángulo Atlántico” en la que se encuentra encerrada América Latina, China ha también beneficiado de un entorno regional propicio como consecuencia de factores tanto estructurales (las debilidades del regionalismo latinoamericano), como coyunturales (la escalada de la “nueva” izquierda sudamericana). El inicio de la década de 2010, sin embargo, parece marcar el final del “giro à la izquierda” y los límites del modelo de desarrollo extractivo adoptado por la mayoría de los gobiernos progresistas latino-americanos. Al mismo tiempo, las autoridades chinas han también iniciado un cambio de modelo de desarrollo económico con el undécimo Plan Quinquenal (2006-2010) para que sea más autocentrado y basado en la producción de productos de alta calidad. Basándose en estas observaciones, este ponencia interroga el impacto de este contexto sobre las relaciones entre China y América Latina. [less ▲]

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See detailÉcrire de “Guiron” en Flandre à la fin du Moyen Âge
Veneziale, Marco ULiege

Conference (2017, July 28)

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See detailThe Prediction-Focused Approach: An opportunity for hydrogeophysical data integration and interpretation in the critical zone
Hermans, Thomas ULiege; Nguyen, Frédéric ULiege; Klepikova, Maria et al

Poster (2017, July 27)

Two important challenges remain in hydrogeophysics: the inversion of geophysical data and their integration in quantitative subsurface models. Classical regularized inversion approaches suffer from ... [more ▼]

Two important challenges remain in hydrogeophysics: the inversion of geophysical data and their integration in quantitative subsurface models. Classical regularized inversion approaches suffer from spatially varying resolution and yield geologically unrealistic solutions, making their utilization for model calibration less consistent. Advanced techniques such as coupled inversion allow for a direct integration of geophysical data; but, they are difficult to apply in complex cases and remain computationally demanding to estimate uncertainty. We investigated a prediction-focused approach (PFA) to directly estimate subsurface physical properties relevant in the critical zone from geophysical data, circumventing the need for classic inversions. In PFA, we seek a direct relationship between the data and the subsurface variables we want to predict (the forecast). This relationship is obtained through a prior set of subsurface models for which both data and forecast are computed. A direct relationship can often be derived through dimension reduction techniques (Figure 1). For hydrogeophysical inversion, the considered forecast variable is the subsurface variable, such as the salinity or saturation for example. An ensemble of possible solutions is generated, allowing uncertainty quantification. For data integration, the forecast variable is the prediction we want to make with our subsurface models, such as the concentration of contaminant in a drinking water production well. Geophysical and hydrological data are combined to derive a direct relationship between data and forecast. We illustrate the methodology to predict the energy recovered in an ATES system considering the uncertainty related to spatial heterogeneity. With a global sensitivity analysis, we identify sensitive parameters for heat storage prediction and validate the use of a short term heat tracing experiment to generate informative data. We illustrate how PFA can be used to successfully derive the distribution of temperature in the aquifer from ERT during the heat tracing experiment. Then, we successfully integrate the geophysical data to predict heat storage in the aquifer using PFA. The result is a full quantification of the posterior distribution of the prediction conditioned to observed data in a relatively limited time budget. [less ▲]

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See detailReal Options Valuation and Stress Test Analysis
Lambert, Marie ULiege

Conference (2017, July 27)

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See detailBuilding flow and transport models with electrical resistivity tomography data
Gottschalk, Ian; Hermans, Thomas ULiege; Knight, Rosemary et al

Poster (2017, July 26)

Aquifer recharge and recovery (ARR) is the process of enhancing natural groundwater resources and recovering water for later use by constructing engineered conveyances. Insufficient understanding of ... [more ▼]

Aquifer recharge and recovery (ARR) is the process of enhancing natural groundwater resources and recovering water for later use by constructing engineered conveyances. Insufficient understanding of lithological heterogeneity at ARR sites often hinders attempts to predict where and how quickly infiltrating water will flow in the subsurface, which can adversely affect the quality and quantity of available water in the ARR site. In this study, we explored the use of electrical resistivity tomography (ERT) to assist in characterizing lithological heterogeneity at an ARR site, so as to incorporate it into a flow and contaminant transport model. In this case, we had non-collocated well core log data and ERT data from a full-scale ARR basin. We compared three independent methods for producing conditional lithology-resistivity probability distributions: 1) a search template to relate the nearest logged well lithologies with ERT resistivity panels, given search criteria; 2) a maximum likelihood estimation (MLE) to match bimodal normal distributions to the histogram of each ERT line; and 3) variogram-based lithology indicator simulations constrained to well data. Each approach leverages Bayes’ Rule to estimate lithology probability given electrical resistivity. The simplest approach (method 1) yields an erroneous conditional probability function where sand dominates the conditional probability at nearly all resistivities, due in part to the strong presence of sand in the wells nearest the ERT lines. The approaches using MLE and lithology simulations (methods 2 and 3) produce similar, more realistic lithofacies probability functions. The range of resistivities where clay and sand overlap differs between methods 2 and 3: ranging between 100 and 200 ohm-m for method 2, and between 30 and 50 ohm-m for the method 3. These differences affect the posterior lithology distributions in multiple point geostatistical (MPS) simulations, and in turn, predictions of flow from models which integrate these results. To test the models, we can compare measured breakthrough times of recharged water at the site to groundwater flow simulation results using the lithofacies models created by each method. The methods described here can inform the integration of non-collocated geophysical data into a variety of applications. [less ▲]

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See detailMarket Efficiency and Hedge Fund Trading Strategies
Lambert, Marie ULiege

Conference (2017, July 26)

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See detailA panmictic Amazonian world? : Bryophytes testify
Ledent, Alice ULiege

Poster (2017, July 25)

Understanding connectivity over different spatial and temporal scales is fundamental for biodiversity conservation and management. The Amazonian rainforest, one of the most diverse biodiversity hotspots ... [more ▼]

Understanding connectivity over different spatial and temporal scales is fundamental for biodiversity conservation and management. The Amazonian rainforest, one of the most diverse biodiversity hotspots, has experienced dramatic range contractions and expansions due to Pleistocene climate oscillations, and its human-induced fragmentation has accelerated at an unparalleled pace in the course of the Anthropocene. In this context, epiphytes, with their relatively short life-cycles, offer an ideal model to investigate the impact of past and present fragmentation on patterns of genetic structure and diversity. Due to the necessity to switch from one host tree to another, or from one leaf to another, epiphytic bryophytes typically exhibit high dispersal syndromes. In line with such high dispersal capacities, recent metacommunity analyses have arisen the intriguing question that Amazonian epiphytic bryophyte communities are homogeneous across very large spatial scales, ultimately raising the notion that they might behave as a basin-wide panmictic population. Here, we implement fine-scale population genetic analyses to address the following questions:(i) Do Amazonian epiphytes exhibit population structure at regional (< 500 km) scale; (ii) If the hypothesis of a panmictic population is rejected, (iia) at which spatial scale does genetic structuring occur, and (iib) do neutral (isolation-by-distance) or ecological (isolation-by-ecology) processes shape patterns of genetic variation? We sampled exemplars of 15 epiphytic bryophyte species from two ecologically contrasted forest types (lowland rainforest and white-sand forest) in a 50,000 km2 area in the middle Rio Negro. Genome-wide genetic data were produced using Genotyping By Sequencing. To circumvent severe taxonomic issues in challenging groups, which, like the Calymperaceae, are dominant in the epiphytic flora, we first implemented species delimitation analyses to sort-out specimens taxonomically. We then described the fine-scale genetic structure of each species and performed isolation-by-distance analyses to detect significant spatial genetic structuring. We finally determined whether isolation-by-distance or ecological filtering contribute to the observed patterns of genetic variation. The study will provide key information on the populations dynamics of highly mobile species integral to the iconic Amazonian forest, which may further be employed to refine future conservation policies in the face of accelerating climate change and anthropogenic-mediated deforestation. [less ▲]

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See detailThe effect of initial water distribution and spatial resolution on the interpretation of ERT monitoring of water infiltration
Dumont, Gaël ULiege; Pilawski, Tamara ULiege; Robert, Tanguy et al

Poster (2017, July 25)

A better understanding of the water balance of a landfill is crucial for its management, as the waste water content is the main factor influencing the biodegradation process of organic waste. In order to ... [more ▼]

A better understanding of the water balance of a landfill is crucial for its management, as the waste water content is the main factor influencing the biodegradation process of organic waste. In order to investigate the ability of long electrical resistivity tomography (ERT) profiles to detect zones of high infiltration in a landfill cover layer, low resolution time lapse data were acquired during a rainfall event. Working at low resolution allows to cover large field areas but with the drawback of limiting quantitative interpretation. In this contribution, we use synthetic modeling to quantify the effect of the following issues commonly encountered when dealing with field scale ERT data: (i) the effect of low resolution on electrical resistivity changes interpretation, (ii) the effect of the original heterogeneous resistivity distribution on the observed relative resistivity changes, (iii) the need for temperature and pore fluid conductivity data in order to compute water content and absolute changes of water content, and (iv) the interpretation error commonly made while neglecting the dilution effect during fresh water infiltration. Firstly, due to the lack of spatial resolution, the regularized inversion process yields a smoothed distribution of resistivity changes that fail to detect small infiltration zones and yields an overestimation of the infiltration depth and an underestimation of the infiltrated volume in large infiltration areas. Secondly, the analysis of relative changes, as commonly used in literature, is not adequate when the background water content is highly heterogeneous. In such a case, relative changes reflect both the initial water content distribution and the observed changes. Thirdly, the computation of absolute water content changes better reflects the infiltration pattern, but requires spatially distributed temperature and pore fluid conductivity input data. Lastly, the dilution effect, if not considered, leads to an underestimation of the infiltrated volume. Taking into account these elements, we extracted the maximum amount of information from our field data without over-interpreting the results. This allowed the detection of larger infiltration areas possibly responsible for a large part of the annual water infiltration and landfill gas loss. [less ▲]

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See detailDual-specificity-phosphatase 3 (DUSP3) deletion promotes liver inflammation and high fat diet-induced hepatocellular carcinoma
Jacques, Sophie ULiege; Arjomand, Arash ULiege; Vandereyken, Maud ULiege et al

Poster (2017, July 24)

Overweight and obesity are considered as risk factors for hepatocellular carcinoma (HCC) development. The mechanisms by which obesity promotes liver inflammation are however poorly understood. We recently ... [more ▼]

Overweight and obesity are considered as risk factors for hepatocellular carcinoma (HCC) development. The mechanisms by which obesity promotes liver inflammation are however poorly understood. We recently generated a full DUSP3 knockout (KO) mouse. The obtained mice were born normal with no spontaneous phenotype. However, while aging, DUSP3-KO mice became obese and developed hepatosteatosis. The phenotype was exacerbated under high fat diet (HFD). Furthermore, when treated with diethylnitrosamine (DEN) procarcinogen, DUSP3-KO mice developed HCC faster than WT littermates. The combination of DEN with HFD accelerated the onset of HCC development in these mice compared to WT mice. This was associated with increased systemic levels of several metabolites and with hyperphosphorylation of the insulin-like growth factor receptor I. [less ▲]

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See detailComprehensive Ion Mobility Calibration Strategies based on Synthetic Polymers
Haler, Jean ULiege; Kune, Christopher ULiege; Chirot, Fabien et al

Conference (2017, July 24)

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See detailHARMONIC BALANCE COMPUTATION OF THE NONLINEAR FREQUENCY RESPONSE OF A THIN PLATE
Lee, Jongsuh ULiege; Kerschen, Gaëtan ULiege; Detroux, Thibaut ULiege

Conference (2017, July 24)

The harmonic balance method (HBM) is used to investigate the dynamical behavior of the geometrical nonlinear plate. The middle plane displacements are included in the plate in which the equations of ... [more ▼]

The harmonic balance method (HBM) is used to investigate the dynamical behavior of the geometrical nonlinear plate. The middle plane displacements are included in the plate in which the equations of motion are developed by the principle virtual work. Moreover, the nonlinear frequency response curves, or NFRCs, are obtained by a continuation method. [less ▲]

Detailed reference viewed: 44 (4 ULiège)
See detailFunctional and structural characterisation of the Arabidopsis thaliana HMA4 protein
Lekeux, Gilles ULiege; Laurent, Clémentine; Xiao, Zhiguang et al

Poster (2017, July 24)

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See detailEffects of User IT Capabilities and Organized Big Data Analytics on Competitive Advantage
Kamioka, Taro; Hosoya, Ryuichi; Tapanainen, Tommi ULiege

in Proceedings of the Pacific-Asian Conference on Information Systems (PACIS) (2017, July 20)

In the age of big data, it becomes important to develop capabilities for utilizing information technology (IT) in order to take advantage of the potential of data for business objectives. While users have ... [more ▼]

In the age of big data, it becomes important to develop capabilities for utilizing information technology (IT) in order to take advantage of the potential of data for business objectives. While users have received attention in many ways, we note that the capability literature has focused more on the IT supply side. We argue that user capabilities have moved to an integral position in firm competitive advantage, and call them “User IT Capabilities” (UIC). A survey was conducted to collect data from Japanese organizations, and a total valid sample of 1,170 respondents involved in big data use was extracted. The findings show the effect of UIC on the performance of big data analytics and firm competitiveness, mediated by the variable of organized big data analytics (OBDA). The direct effects are shown to be valid irrespective of company size, although the levels of UIC and OBDA are higher in larger firms. [less ▲]

Detailed reference viewed: 53 (4 ULiège)
See detailIntraspecific variation of Zn hyperaccumulation in Arabidopsis halleri populations
Schvartzman Echenique, Maria Sol ULiege; Corso, Massimiliano; Fataftah, Nazeer ULiege et al

Conference (2017, July 19)

Detailed reference viewed: 28 (2 ULiège)
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See detailItem purification versus adjustments for multiple comparisons in DIF detection
Drabinova, Adela; Martinkova, Patricia; Magis, David ULiege

Poster (2017, July 18)

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See detailmstR: An R package to generate multistage testing designs
Magis, David ULiege; Yan, Duanli; von Davier, Alina

Conference (2017, July 18)

Multistage testing (MST; Yan, von Davier & Lewis, 2014) has become an important framework of tailored testing. Similarly to computerized adaptive testing (CAT) it proposes an optimal routing of the ... [more ▼]

Multistage testing (MST; Yan, von Davier & Lewis, 2014) has become an important framework of tailored testing. Similarly to computerized adaptive testing (CAT) it proposes an optimal routing of the administered items according to the previous test taker’s responses. However, items are not selected and administered as single units but as modules (subsets). The main goal of MST consists in selecting the optimal path of modules across the successive stages of the test. Unfortunately, if various operational testing programs are nowadays considering MST for practical administrations, there is still very limited access to accurate software that can either treat or generate MST scenarios for research purposes. In this talk we succinctly present a new package from the R software, called mstR (Magis, Yan & von Davier, 2017). Built in the same spirit of the package catR for CAT designs, it permits to generate repeated response patterns under a predefined MST scenario by providing the set of modules and related item parameters, the number of stages and the connections between modules from successive stages. Several rules for optimal module selection and ability estimation (under IRT framework or based on test scores) are also available. This talk will mostly focus on the (non-technical) description of package mstR and its main features. An example will also be described as an illustration of this framework. [less ▲]

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See detailFluencyBank: studying typical and disordered speech fluency across languages and contexts
MacWhinney, Brian; Leclercq, Anne-Lise ULiege; Zwitserlood, Rob et al

Conference (2017, July 18)

Mastering the skill to produce fluent speech is a complex task that is still poorly understood. Similarly, the threshold at which typical fluency breakdown begins to attract clinical concern is also a ... [more ▼]

Mastering the skill to produce fluent speech is a complex task that is still poorly understood. Similarly, the threshold at which typical fluency breakdown begins to attract clinical concern is also a matter of frequent disagreement. The goal of the recently funded FluencyBank project, an arm of TalkBank, is to facilitate collection and analysis of expressive speech samples across the lifespan, languages, and clinical diagnoses. Speakers will illustrate the challenges and opportunities available to the study of expressive language development skill. The first speaker (Leclercq) will examine the need for reference data across languages in order to distinguish typical developmental disfluency from stuttering, using data from French. The second speaker (Zwitserlood) will confirm and elaborate on the profile of elevated disfluency profiles in children with SLI, using Dutch data. The third speaker (Byrd) will describe the theoretical and practical challenges of discriminating typical fluency profiles from clinical stuttering in bilinguals, with emphasis on Spanish-English child speakers. The fourth speaker (Ratner) will update information linking language proficiency to stuttering onset and persistence/recovery, showing the complex interactions between speech and language formulation. Each speaker will emphasize the many intertwining skills that underlie the development of spoken language fluency and the benefits of specialized cooperative initiatives such as FluencyBank to collect data for exploration of otherwise impossible to answer hypotheses. Moderator Brian MacWhinney, Co-Investigator of FluencyBank will discuss its development, planned research projects and computational tool development, and illustrate potential applications for use by child language researchers. [less ▲]

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See detailProtein-polysaccharide complexes for improved protein delivery within CaCO3 microparticles
Ramalapa, Bathabile ULiege; Crasson, Oscar ULiege; Vandevenne, Marylène ULiege et al

Conference (2017, July 17)

Introduction: The controlled delivery of proteins within calcium carbonate (CaCO3) particles is currently widely investigated due to accessibility, low cost, safety, pH-sensitive properties, high surface ... [more ▼]

Introduction: The controlled delivery of proteins within calcium carbonate (CaCO3) particles is currently widely investigated due to accessibility, low cost, safety, pH-sensitive properties, high surface area and high porosity. The success of these carriers has been driven by the ionic interactions between proteins and particles making the encapsulation of proteins highly dependent on the pH of reaction solutions and the isoelectric point of the protein. This poses a great limitation on the successful loading of proteins into microparticles. In this study we explored the use of polysaccharide-protein complexes to enhance the encapsulation of otherwise poorly encapsulated proteins in CaCO3 microparticles. Methods: A chitin binding domain (ChBD) was inserted on the protein β-lactamase to form a chimeric protein. A protein-polysaccharide complex was formed between the protein and hyaluronic acid (HA) owing to the intrinsic affinity of the ChBD to HA. The chimeric protein was then loaded into CaCO3 microparticles using super critical CO2 technology aided by the templating effect of HA on CaCO3. The microparticles were characterised for size, surface charge, polymorphism and protein loading. Bioactivity and stability of the encapsulated β-lactamase was characterised by kinetic reaction with nitrocefin. A thrombin cleavage site was inserted onto the gene sequence of the protein to achieve release of the protein from the microparticles by proteases mediation using thrombin. Results: Vaterite CaCO3 microparticles of sizes ranging between 6 and 8 µm were produced. The presence of the ChBD on the β-lactamase increased the encapsulation of the protein by 6 fold when complexed with HA. Thrombin mediated release increased the release of the protein from the microparticles within 36 hours from <25% to 87%. The protein-polysaccharide complex demonstrated success in encapsulation of the protein while retaining up to 81% activity of the protein and allowing controlled release by proteases. Conclusion: Protein-polysaccharide complexation demonstrates an excellent approach for the delivery of sensitive biomacromolecules which can otherwise be complicated due to electrostatic hindrances. Future prospects include using the methods we have developed for encapsulation of therapeutic proteins and using calcium carbonate as a carrier and scaffold for example in bone regeneration. [less ▲]

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See detailA Novel Accelerometer-Based Method for Stride Length Estimation
Boutaayamou, Mohamed ULiege; Schwartz, Cédric ULiege; Denoël, Vincent ULiege et al

Poster (2017, July 14)

We demonstrate the feasibility of accurately and precisely estimating the left/right average stride length from measured heel/toe accelerations in the gait of healthy, old adults. Our approach relies on ... [more ▼]

We demonstrate the feasibility of accurately and precisely estimating the left/right average stride length from measured heel/toe accelerations in the gait of healthy, old adults. Our approach relies on (1) a novel method that uses only accelerometer data without the need of additional data from, e.g., gyroscopes and/or magnetometers, and on (2) the validation of the results using reference 3D optoelectronic system data. [less ▲]

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See detailRegression analysis of potato dormancy integrating genetic and environmental factors.
Visse-Mansiaux, Margot ULiege; Vanderschuren, Hervé ULiege; Soyeurt, Hélène ULiege et al

Conference (2017, July 14)

Potato dormancy is usually described as the period required by potato tubers to initiate sprouting after harvest. The dormancy parameter is key for the potato value chain because it defines the storage ... [more ▼]

Potato dormancy is usually described as the period required by potato tubers to initiate sprouting after harvest. The dormancy parameter is key for the potato value chain because it defines the storage period during which no anti-sprouting treatment is required. Dormancy is known to have a genetic component because the time from harvest to sprouting varies between potato varieties. A better characterization of dormancy helps optimizing storage by reducing the frequency of anti-sprouting applications. Reducing the anti-sprouting treatments not only helps lowering storage costs but it also provides an immediate benefit for human health and for the environment. The main objective of the present study is to develop a model predicting the dormancy length in function of the cultivar and the growing conditions of the considered year. So, 2 sources of informations were used: 1) average dormancy of cultivars provided by breeders (breeders dormancy) 2) average dormancy of cultivars obtained from field experiments (field dormancy). The field experiments were managed in Switzerland during 25 years in four different locations and for 721 varieties of potatoes. Field data were registered during the growing season such as weather data (e.g. temperature, rainfall etc.), soil data and crop management data. One month after harvest, the potatoes were stored at 8°C in wooden crates containing 7 kg of potato tubers. The dormancy was defined as the time between the harvest and the emergence of the first sprouts. The data (n=3’730) were analyzed as follow: (1) calculation of the field dormancy, which is the average dormancy length of the tested cultivars from the field data; (2) merging of field dormancy and breeders dormancy records (3) univariate regressions to study the link between the breeders and field dormancy records; (3) ANOVA to identify the parameters with the highest influence on the dormancy length; (4) creation of a model using these identified parameters in order to predict the sprouting date of potato stocks based on the field data; (5) validation of the model. Our results highlight the heterogeneity of the dormancy data provided by the potato breeders. Our results also stress the importance of climatic and field parameters to estimate the dormancy length of a given potato stock. We discuss the practical consequences for growers and potato storage companies. [less ▲]

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See detailLife cycle in practice - How to help SMEs to integrate life cycle thinking concept?
Groslambert, Sylvie ULiege

Conference (2017, July 13)

Context The application of Life Cycle Approaches – including Life Cycle Assessment, eco-design and environmental labelling – is becoming an increasing reality for business, and a growing challenge in many ... [more ▼]

Context The application of Life Cycle Approaches – including Life Cycle Assessment, eco-design and environmental labelling – is becoming an increasing reality for business, and a growing challenge in many economic sectors. Businesses are facing increasing legal and market requirements to enhance resource efficiency and reduce the environmental impact of their products & services. To significantly address this challenge, the Life Cycle in Practice project (LCiP - LIFE12 ENV/FR/001113) was conceived, aiming to promote the uptake of LC approaches particularly in SMEs. This project is co-financed by the LIFE Program + Policy and Governance on the theme of the environment of the European Un-ion, supporting technological projects with significant environmental impacts. Project The overall aim of the LCiP project is to help SMEs in France, Belgium, Portugal and Spain in reducing the environmental impacts of their products and services across the entire Life Cycle and to foster the implementation of circular economy in these regions. Three sectors are selected: Buildings & Construction, Waste Management and Energy Equipment. Thirty-two businesses are involved in the four regions, twelve being located in Wallonia. The Competition Clusters GreenWin is the Walloon partner, and it has man-dated several teams well known for their expertise in LCA to coach them Results ULg-PEPs coached three SMS's to help them to carry out the Life Cycle Assessment (LCA) of their product and accordingly to identify the strengths and weakness of the products and/or processes. Two of them are involved in building insulation (hemp con-crete blocs from IsoHemp and sound insulation panels Acoustix made by Pan-Terre), and the third one is developing an accelerated composting equipment for food waste (Eco-Cleaner). Concretely, the LCA of the three products are realised in a cradle to gate perspective. The results show possible environmental impact improvement for all the products, even if they are eco-designed. As a coach, the experience of working closely with highly motivated people in small structures is very gratifying and a smart way to help life cycle approaches to develop in our region. We are pleased to go on this initiative by hosting one of the Physical Resource Cen-tres in the University of Liège to welcome SMEs seeking to integrate LC approaches into their businesses, and give them access to selected LCA tools, reading material, expertise, training and advice. Results and Online Resource Center are centralised on the LCiP website: http://www.lifelcip.eu/ [less ▲]

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See detailHighly efficient doped nanocristalline TiO2 for water Treatment
Mahy, Julien ULiege; Léonard, Géraldine ULiege; Zubiaur, Anthony ULiege et al

Conference (2017, July 13)

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See detailUndoing Art
Delville, Michel ULiege

Conference (2017, July 13)

Detailed reference viewed: 27 (4 ULiège)
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See detailNon-pathological aging of the executive functions: influence of the Val108/158Met nucleotide polymorphism of the COMT gene
Gilsoul, Jessica ULiege; Manard, Marine ULiege; Collette, Fabienne ULiege

Poster (2017, July 13)

Objectives. The aim of the study is to investigate the influence of the COMT Val108/158Met nucleotide polymorphism, associated with dopaminergic regulation, on executive functions in normal aging. Indeed ... [more ▼]

Objectives. The aim of the study is to investigate the influence of the COMT Val108/158Met nucleotide polymorphism, associated with dopaminergic regulation, on executive functions in normal aging. Indeed, according to the Dual-State Theory, Val/Val polymorphism of the COMT gene would favor better flexibility abilities, whereas Met/Met carriers would favor better stability abilities. These genotypic effects should be magnified in older people, as a decrease in cognitive resources increases the influence of individual genetic differences on cognitive performance. Method. We assessed the executive processes of inhibition, shifting, and updating – thanks to many different tasks in groups of young (n = 55) and aged participants (n = 45) carrying one of the three polymorphism of the COMT gene (Val/Val, Val/Met, Met/Met). T-tests between our two groups (Young versus Aged) but also a 6 (Group: Young-Met/Met, Young-Val/Met, Young- Val/Val, Old-Met/Met, Old-Val/Met, and Old-Val/Val) X 3 (Executive functioning: Inhibition, Shifting, and Updating) repeated measure ANOVA with Executive functioning as within-subject factor (p < .05) were carried out. Results. Young and old participants significantly differed on the three executive functions. The comparison of genotypic groups showed no significant differences in young or older participants respectively. Interestingly, the Old-Val/Val group showed a lower performance than the young one on inhibition tasks. Conclusion. As expected, we found an age effect on all the executive functions. The significant difference between the Young-Val/Val and the Old-Val/Val groups on inhibition suggests an age-related decrease in abilities requiring a stability component in individuals possessing a less favoring genotype for this component. [less ▲]

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See detailDu dessin au design. Seth comme auteur-rééditeur
Crucifix, Benoît ULiege

Conference (2017, July 13)

Depuis ces dernières années, l’édition de bande dessinée connaît un véritable boom de rééditions patrimoniales. Dans le contexte nord-américain, ce sont justement les auteurs associés au « roman ... [more ▼]

Depuis ces dernières années, l’édition de bande dessinée connaît un véritable boom de rééditions patrimoniales. Dans le contexte nord-américain, ce sont justement les auteurs associés au « roman graphique » – ceux-là même qui ont exploré le livre en tant qu’objet en réalisant eux-mêmes le design de leurs œuvres – qui sont aussi invités à prendre en charge la conception graphique de ces rééditions d’œuvres du passé qu’ils aident à faire (re)découvrir. Cette communication a pour but d’étudier les designs réalisés par l’auteur canadien Seth pour plusieurs œuvres complètes : The Complete Peanuts, The John Stanley Library et The Collected Doug Wright. Les designs de Seth se caractérisent par leur mise-en-avant d’une esthétique idiosyncratique, comme il l’a lui-même exprimé : « when I design something it really is too much about me » (Spurgeon, 143). Elles se lient donc intimement à la production « propre » de l’auteur. Dans le cas de Stanley et Doug Wright, ces rééditions sont d’ailleurs liées à des essais écrits par Seth, relevant d’un travail autant esthétique qu’historiographique. Il s’agira d’abord de comprendre la spécificité culturelle de cette pratique de réédition dans l’édition « alternative » américaine, qui diffère du contexte éditorial européen ; plus en avant, le cas de Seth permettra de comprendre comment cette pratique ressort d’un mécanisme de canonisation particulier (Heer), mais aussi de montrer à quel point ce type d’objets met en avant une « fonction-auteur » (Foucault) inextricablement liée à une activité historiographique, éditoriale et patrimoniale. [less ▲]

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See detailEffect of surface modification of polylactides on fibroblasts L-929 and osteoblasts MG-63
Tilkin, Rémi ULiege; Regibeau, Nicolas ULiege; Lambert, Stéphanie ULiege et al

Conference (2017, July 12)

During the past few years, tissue engineering has become one of the most promising techniques to maintain, improve, or reconstruct human tissue, even complete human organs. This solution is frequently ... [more ▼]

During the past few years, tissue engineering has become one of the most promising techniques to maintain, improve, or reconstruct human tissue, even complete human organs. This solution is frequently based on the realization of temporary porous matrices, also called "scaffolds", design as model and structure for the development of cells. Surface properties of those biomaterials are some determinant criteria for cell adhesion and proliferation. The scope of this work is the study of adhesion and proliferation of fibroblasts L-929 and osteoblasts MG-63 on untreated, hydrolyzed or aminolyzed polylactides. First, these substrates are developed: poly-L,D-lactide (PDLLA) powder is pressed into disks. The surface of disks was chemically modified by hydrolysis and aminolysis surface treatments. Surface modifications were based on previous studies. [1,2] The hydrolysis process is carried out by immersing PDLLA disks in 2 M NaOH for 20 min at room temperature (24°C) under constant agitation. The aminolysis process is performed by placing PDLLA disks in 15 % ethylenediamine in isopropanol for 5 min at room temperature (24°C) under constant agitation. Substrates are characterized by optical microscopy, Scanning Electron Microscopy and water contact angle. Finally, cell adhesion, proliferation, and viability on these substrates are assessed by cell counting and MTT assay after 1, 4, and 8 days of cell culture. Results from surface characterization show an increase of roughness for hydrolyzed polylactide. Regarding water contact angle measurements, values are smaller on treated substrates even though the difference with untreated substrates appears smaller than expected in the literature. [1,2] Cell counting and MTT assay show an increase of cell proliferation and cell viability for treated polylactide substrates in the case of fibroblasts and a decrease of cell proliferation for aminolyzed polylactide substrates in the case of osteoblasts. In conclusions, this work highlights the different effects of surface modification on fibroblasts and osteoblasts viability. References : [1]. Wang YQ, Cai JY. Enhanced cell affinity of poly(L-lactic acid) modified by base hydrolysis: wettability and surface roughness at nanometer scale. Current Applied Physics 2007, 7(S1):e108–e111. [2]. Lin Y, Chrzanowski W, Knowles J, Bishop A, Bismarck A. Functionalized poly(D,L-lactide) for pulmonary epithelial cell culture. Advanced Engineering Materials 2010, 12(4): B101–B112. [less ▲]

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See detailMapping the diachrony of content words: Ancient Greek and Ancient Egyptian as sources for diachronic semantic maps of lexical items
Georgakopoulos, Athanasios ULiege; Polis, Stéphane ULiege

Conference (2017, July 12)

This paper aims at demonstrating how information on the paths of semantic extensions undergone by content words may be incorporated into semantic maps. For this purpose, particular changes that affected ... [more ▼]

This paper aims at demonstrating how information on the paths of semantic extensions undergone by content words may be incorporated into semantic maps. For this purpose, particular changes that affected the meanings of words in the course of the Ancient Greek and of the Ancient Egyptian language history will be investigated. The semantic map model was initially created in order to describe the polysemic patterns of grammatical morphemes (e.g. Haspelmath, 2003). However, recent studies by François (2008), Perrin (2010), Wälchli and Cysouw (2012), and Georgakopoulos et al. (2016) have drawn attention to the lexical domain, showing that the model can be extended to lexical items. It should be noted that the bulk of research has been adopting a synchronic perspective and the limited research that has added the diachronic dimension, has focused mostly on the grammatical domain (e.g. Narrog, 2010). In this paper, we analyze the diachronic evolution of the polysemy network of lexemes in order to produce ‘dynamicised semantic maps’ (Narrog & van der Auwera, 2011) of lexical items. More specifically, we study concepts from the semantic domains of TIME. The data are extracted from dictio-naries, grammars, and the Perseus digital library (http://www.perseus.tufts.edu/hopper/) for Ancient Greek, and from the Thesaurus Linguae Aegyptiae (http://aaew.bbaw.de/tla/), the Ramses corpus (http://ramses.ulg.ac.be), and etymological dictionaries for Ancient Egyptian. Information on synchronic lexical associations are extracted from CLICS (List et al., 2014), an online database containing tendencies of meaning associations. In CLICS, concepts are represented as nodes in the network and instances of polysemy are visualized as links between the nodes. The diachronic dimension of meaning extension may be added to such a network (Figure 1). On the basis of a diachronic analysis of TIME in Ancient Greek (lexical unit: hṓra), which reveals that the meaning ‘time’ is historically prior to the meaning ‘hour,’ we may add a directed arrow representing directionality of change. However, historical priority is not a sufficient criterion for an arrow to be added. Rather, one should be able to show that meaning extensions have a clear motivation.As such, we suggest identifying the cognitive (e.g. metaphor, metonymy, etc.) and the cultural factors that lie behind the observed evolutions. For example, in the case of the Greek concept TIME, one could establish a metonymic motivation between TIME and HOUR, which arises due to the correlation between the canonical time periods and the time these take to unfold. The present study will provide answers to the question of the directionality of change in two particular languages, namely Ancient Greek and Ancient Egyptian. However, our expectation is that by looking at diachrony in this fashion, significant dimensions of directionality of change with cross-linguistic extensions can be revealed. [less ▲]

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See detailAdvanced oxidative treatment for waste water contaminated by pharmaceutical products
Wolfs, Cédric ULiege; Vreuls, Christelle; Gillard, Nathalie et al

Conference (2017, July 12)

The objective of this study is to determine operational processes for advanced oxidative treatment of waste waters contaminated with pharmaceutical products. The aim is to validate a physico-chemical ... [more ▼]

The objective of this study is to determine operational processes for advanced oxidative treatment of waste waters contaminated with pharmaceutical products. The aim is to validate a physico-chemical process that has to be placed downstream a classical biological treatment in existing waste water treatment plants (domestic, industrial or hospital). [less ▲]

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See detailDistributions of urban geometric attributes: a stochastic Muth-Mills approach
Delloye, Justin; Peeters, Dominique; Tharakan, Joseph ULiege

Conference (2017, July 12)

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See detailInfluence of environmental conditions on trophic niche partitioning among sea stars assemblages
Le Bourg, Baptiste ULiege; Blanchard, Alice; Danis, Bruno et al

Conference (2017, July 10)

The Southern Ocean undergoes intense and contrasted impacts linked to climate change. The Western Antarctic Peninsula is one of the most rapidly warming regions of the world (Meredith and King, 2005 ... [more ▼]

The Southern Ocean undergoes intense and contrasted impacts linked to climate change. The Western Antarctic Peninsula is one of the most rapidly warming regions of the world (Meredith and King, 2005), resulting in sharp sea ice cover decrease (Parkinson and Cavalieri, 2012). In contrast, surface temperature and sea ice cover remain stable in other regions such as the Weddell Sea. Sea stars (Echinodermata: Asteroidea) are a key group of the Southern Ocean benthos, thought to be quite resistant to seawater temperature changes (Peck et al., 2008). Other, more indirect environmental changes, might induce important shifts in food web structure and fluxes, that may affect sea stars trophic ecology. In this context, the aim of this study was to use stable isotopes ratios of C, N and S to study sea stars trophic ecology to characterise their trophic diversity and plasticity regarding food web changes. Sea stars were sampled during the austral summer in the South Georgia (sub-Antarctic) in 2011 and in the South Shetland (2006) and South Orkney Islands (2016), as well as in the Weddell Sea (2015-2016). Trophic diversity, i.e. differences of trophic ecology between sea star species, and variability, i.e. differences of trophic ecology between individuals of the same species, were investigated in each region by investigating isotopic dispersion and isotopic niche (proxy of the trophic niche) areas and overlap. Difference in niche width and overlap between the regions may be the result of different environmental conditions, including sea ice coverage and dynamics. For example, in the South Shetland, sea stars had small and poorly differentiated isotopic niches. This result indicate that they may exploit the same benthic communities relying on few common food sources such as organic matter released during sea ice melting (Isla et al., 2006) or sinking phytoplankton (Mincks et al., 2008). Whether this situation leads to competition or not depends on the resources availability. In contrast, isotopic niches were larger and better separated for sea stars from South Georgia. South Georgia is an oligotrophic environment with no sea ice (Korb et al., 2008). As available food items are more limited but, perhaps, more diversified, a higher trophic segregation may appear between species. Ultimately, this project will help delineating processes determining trophic ecology of Southern Ocean sea stars. This research was funded by the Belgian Federal Science Policy Office (BELSPO) in the framework of the vERSO and RECTO project (rectoversoprojects.be). [less ▲]

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See detailDetermining fine population structure using iterative pruning
Chaichoompu, Kridsadakorn ULiege; Yazew, Fentaw Abegaz; Tongsima, Sissades et al

Poster (2017, July 10)

SNP-based information is used in several existing clustering methods to detect shared genetic ancestry or to identify population substructure (Price et al. 2006, Raj et al. 2016). Here, we present an ... [more ▼]

SNP-based information is used in several existing clustering methods to detect shared genetic ancestry or to identify population substructure (Price et al. 2006, Raj et al. 2016). Here, we present an unsupervised clustering algorithm called the iterative pruning method to capture population structure (IPCAPS). Our method supports ordinal data which can be applied directly to SNP data to identify fine-level population structure and it is built on the iterative pruning Principal Component Analysis (ipPCA) algorithm (Intarapanich et al. 2009). The IPCAPS involves an iterative process using multiple splits based on multivariate Gaussian mixture modeling of principal components and Clustering EM estimation as in Lebret et al. (2015). In each iteration, rough clusters and outliers are also identified using our own method called RubikClust. The fixation index (FST) is known to measure a distance between populations and FST = 0.001 may be said to be genetically distinct among the European populations (Tian et al. 2008, Huckins et al. 2014). To observe fine-level population structure using FST, we examined simulated scenarios of one population, 500-8,000 individuals, 5,000-10,000 independent SNPs in HWE (Balding and Nichols 1995), with 100 replicates for each scenario. The simulated SNPs were encoded as additive coding and there was no missing genotype generated. We introduced negative control by subjecting individuals to be separated into two groups using kmeans. We observed that FST values of divided groups were lower than 0.0008, which can be defined as the minimum FST to detect fine-level population structure. To evaluate the performance of our method, we tested different simulated data sets of 2-3 populations, 250 individuals per population, 10,000 independent SNPs in HWE, and FST=[0.0008,0.005], with 100 replicates for each data set. For real-life data sets, we applied the IPCAPS to Thai (Wangkumhang et al. 2013) and HapMap populations. Our method showed that a population classification accuracy was superior to the ipPCA in simulated scenarios of extremely subtle structure (FST=[0.0009,0.005]). In case of the Thai population, results to detect fine-level structure were obtained as well as in case of the HapMap populations. We are convinced that the IPCAPS has a potential to detect fine-level structure and it will be important in molecular reclassification studies of patients once underlying population structure has been removed. [less ▲]

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See detailDépolitisation et politisation de la formation des majorités communales en Belgique
Grandjean, Geoffrey ULiege

Conference (2017, July 10)

Since 2001, the competences for the organization and election of local authorities in Belgium have been regionalized. The Regions – federated powers – are now competent to take law on these matters. The ... [more ▼]

Since 2001, the competences for the organization and election of local authorities in Belgium have been regionalized. The Regions – federated powers – are now competent to take law on these matters. The three Belgian Regions (Brussels-Capital, Flemish and Walloon) have adopted different law which aims to partially depoliticize the naming of mayors and aldermen. The legal rules constrain the political game concerning the composition of the communal colleges and the colleges of mayors and aldermen. The representatives take into account these legal rules during political negotiations for forming a political majority. The dynamics of governance have therefore significantly changed within the municipalities since 2001 and have diverged between the three Regions. In order to illustrate the depoliticization of the naming process of the communal colleges and the colleges of mayors and aldermen and the reappropriation of legal constraints by the representatives, it is proposed to analyze the formation process of political majorities following the last communal elections in the three Regions. For each Region, two municipalities are chosen because of the specificities that arose during the negotiations, leading to the mobilization of multiple arguments (especially legal arguments) to justify the choice of certain coalition partners. This choice makes it possible to highlight the diverse processes of reappropriation of legal constraints by political actors at the local level. [less ▲]

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See detailDimensions adaptatives des fonctionnements pervers et psychopathiques : une approche étho-phénoménologique
Englebert, Jérôme ULiege

Conference (2017, July 10)

Notre objectif est de discuter des diagnostics du fonctionnement psychologique pervers et de la personnalité psychopathique. Si les versions récentes du DSM (IV et 5) ignorent ces diagnostics, la pratique ... [more ▼]

Notre objectif est de discuter des diagnostics du fonctionnement psychologique pervers et de la personnalité psychopathique. Si les versions récentes du DSM (IV et 5) ignorent ces diagnostics, la pratique clinique suggère de conserver ces deux entités présentant une finesse psychopathologique plus grande et un pouvoir discriminatif plus important que la personnalité antisociale. Nous souhaitons interroger les dimensions intrinsèquement adaptatives de ces deux entités, mais aussi relever leurs différences sur le continuum de l’adaptation. Nous chercherons, en effet, à démontrer que le principe d'adaptation est une dimension centrale et commune aux deux entités, mais qui « se joue » de façons différentes pour chacune. Le pervers est hyper-adapté à son interlocuteur tout en présentant des moments paradoxaux d'inadaptation. Le psychopathe, avec sa faculté de chosification de l'alter ego et ses compétences émotionnelles paradoxales, présente une adaptation plus solitaire. Dans une perspective inspirée des paradigmes éthologique et phénoménologique, nous tenterons de cerner les différences essentielles entre ces deux modes d’être-au-monde. [less ▲]

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See detailIncreased sea ice cover disrupts food web structure in Antarctic coastal benthic ecosystem
Michel, Loïc ULiege; Danis, Bruno; Dubois, Philippe et al

Conference (2017, July 10)

Antarctica currently undergoes strong and contrasted impacts linked to climate change. While the West Antarctic Peninsula is one of the most rapidly warming regions in the world, resulting in sea ice ... [more ▼]

Antarctica currently undergoes strong and contrasted impacts linked to climate change. While the West Antarctic Peninsula is one of the most rapidly warming regions in the world, resulting in sea ice cover decrease, the sea ice cover of East Antarctica unexpectedly tends to increase. Here, we studied shallow (0-20 m) benthic food web structure on the coasts of Petrels Island (Adélie Land, East Antarctica) during an event of unusually high spatial and temporal (two successive austral summers without seasonal break-up) sea ice cover. Using time-tested integrative trophic markers (stable isotope ratios of carbon, nitrogen and sulfur) and state-of-the-art data analysis tools (Bayesian ecological models), we studied the structure of the food web associated to benthic macroinvertebrates communities. In total, 28 taxa spanning most present animal groups (sponges, sea anemones, nemerteans, nematods, sipunculids, sessile and mobile polychaetes, gastropods, bivalves, pycnogonids, crustaceans, sea stars, sea urchins, brittle stars and sea cucumbers) and functional guilds (grazers, deposit feeders, filter feeders, predators, scavengers) were investigated. Our results indicate that the absence of seasonal sea ice breakup deeply influences coastal benthic food webs. We recorded marked differences from literature data, both in terms of horizontal (i.e. primary producers and resources supporting animal populations) and vertical (i.e. trophic level of the studied consumers) structure of the food web. Overall, sympagic algae dominated the diet of many key consumers, and the trophic levels of invertebrates were low, suggesting omnivore consumers relied less on predation and/or scavenging than in normal environmental conditions. Surprisingly, few animals seemed to feed on the extremely abundant benthic biofilm, whose exceptional development was also presumably linked with the peculiar sea ice conditions. Comparison of data obtained in the austral summers of 2013-2014 (first year without seasonal breakup) and 2014-2015 (second year without seasonal breakup) clearly showed that the observed trends were linked to actual temporal changes in invertebrate feeding habits rather than with other potential ecological drivers. Our results provide insights about how Antarctic benthic consumers, which have evolved in an extremely stable environment, might adapt their feeding habits in response to sudden changes in environmental conditions and trophic resource availability. They also show that local and/or global trends of sea ice increase in Antarctica have the potential to cause drastic changes in food web structure and therefore impact benthic communities. This research was funded by the Belgian Federal Science Policy Office (BELSPO) in the framework of the vERSO project (http://www.versoproject.be). [less ▲]

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See detailNon-destructive investigation of hybrid of ferromagnet /(RE)BCO large grain bulks by flux extraction magnetometry and levitation force
Vanderbemden, Philippe ULiege; Philippe, Matthieu; Wera, Laurent ULiege et al

Conference (2017, July 10)

This work deals with bulk, large grain superconductors used as permanent magnet for rotating machines or levitation applications. It has recently been shown that the magnetic properties of bulk large ... [more ▼]

This work deals with bulk, large grain superconductors used as permanent magnet for rotating machines or levitation applications. It has recently been shown that the magnetic properties of bulk large grain superconductors can be improved easily by attaching a short section of a soft ferromagnetic material (F) to one of the faces of the bulk superconductor (S), thereby producing a hybrid F/S structure [1]. Here we investigate the contactless determination of the magnetic behavior of such structures using a recently constructed bespoke magnetometer based on the flux extraction technique [2]. This device allows magnetic moments as large as 1 Am² to be measured at 77 K and accommodates large bulk samples up to 20 mm diameter. This extends significantly the accessible measurement range of “off-the shelf” magnetometers. Unlike techniques based on recording the distribution of flux at the surface of the sample, the measured signal is representative of the superconducting currents flowing across the entire volume of the sample. In the present work we examine the properties of permanently magnetized superconductors and hybrid structures, and measure the irreversible demagnetization of these structures when they are subjected to magnetic field cycles that are not parallel to their magnetization. We also investigate the levitation behavior of hybrid structures subjected to the non-uniform field of a permanent magnet or a combination of permanent magnets used as guideway for levitation applications, and compare the results to those obtained with a bulk superconductor alone. This abstract is for the special session on bulk superconductivity. References: [1] Egan R. et al., Rev. Sci. Instrum. 86 (2015) 025107 [2] M. P. Philippe et al., Supercond. Sci. Technol. 28 (2015) 095008 Acknowledgments: We greatly acknowledge Nippon Steel & Sumitomo Metal Corporation for providing bulk large grain GdBa2Cu3O7 (GdBCO) samples. [less ▲]

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See detailThermal treatments for tailoring the microstructure and wear behaviour of friction stir processed Aluminium-C fibres composites
Mertens, Anne ULiege; Storti, Marco; Simar, Aude et al

Conference (2017, July 10)

A new and simple method for the production of metal matrix composite by friction stir processing (FSP) sandwiches made from metal sheets (e.g. Mg- or Al-based alloy) intercalated with a reinforcing ... [more ▼]

A new and simple method for the production of metal matrix composite by friction stir processing (FSP) sandwiches made from metal sheets (e.g. Mg- or Al-based alloy) intercalated with a reinforcing material e.g. a carbon fabric has recently been devised by the present authors [A. Mertens et al., Mater. Charact. 107 (2015), 125-133]. This process allowed the production of large-size sound metal matrix composites, but the usage properties (e.g. wear resistance,...) of these composites are not yet optimised. Indeed, the matrix of the composite may be softened after processing as FSP is known to cause dissolution of the precipitates responsible for strengthening Mg- or Al-based alloys [A. Simar et al., Mater. Sci. Eng. A 486 (2008), 85-95]. This work thus aims at investigating the potential of thermal treatments for tailoring the microstructure and wear behaviour of age hardenable aluminium alloy 6005 – C fibres composites. The effect of (solution and) ageing treatments on the microstructure and hardness of FSPed Al-C composites has been investigated using optical and scanning electron microscopy, along with Vickers hardness tests. The wear behaviour of the as-FSPed and of the heat treated specimens has been characterized using a pin-on-disc tribometer. Moreover, reference AA6005 samples without C fibres have been produced and tested under similar conditions. The comparison of the reference and of the composite samples allows a better understanding of the role of the C fibres in controlling the grain size of the Al matrix by influencing recrystallisation during FSP and grain growth during thermal treatments. [less ▲]

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See detailTrematominae and Artedidraconinae: contrasted mitogenome evolution for two Antarctic radiations
Dettai, Agnes; Auvinet, Juliette; Frederich, Bruno ULiege et al

Conference (2017, July 10)

Cellular respiration has been widely studied in Antarctic teleost fishes because of their peculiar adaptations to an extreme environment. In parallel mitochondrial sequence markers have become highly ... [more ▼]

Cellular respiration has been widely studied in Antarctic teleost fishes because of their peculiar adaptations to an extreme environment. In parallel mitochondrial sequence markers have become highly popular for molecular systematics. However, there are few whole mitochondrial genome sequences published, and none available for some of the subfamilies. Here, we present two large mitogenome datasets including most species and multiple sequences for many species of two subfamilies, Trematominae and Artedidraconinae (Duhamel et al. 2014). These include two highly diverse but very different adaptative radiations, with contrasting divergence dates, morphological polymorphism, and habitat dominance. The sampling is based on a well identified, extensive collection resulting from the 2008 CEAMARC survey and the subsequent REVOLTA surveys in Terre Adélie (IPEV), already DNA barcoded and sequenced in previous studies. The mitogenome sequences for these two subfamilies differ in composition, gene order, and relative divergence of mitochondrial markers, with strong, taxon-specific biases like very high C contents in some regions. The gene order change provides a synapomorphy for the subfamily Trematominae and an interesting development in teleost mitogenomes. The complete Artedidraconinae mitogenomes provide a much higher amount of variable sites (approx*30), while previous sequence datasets were plagued by low informativeness (Lecointre et al. 2011). As already established on single mitochondrial genes, intraspecific variability is lower than interspecific variability within each subfamily, however interspecific variability in Artedidraconinae is lower or similar to intraspecific variability in Trematominae. This expanded dataset confirms the unusual evolution of the mitochondrial coded sequences involved in the cellular respiration in Antarctic Nototheniidae, as well as the usefulness of complete mitochondrial genomes for their systematics. The two level multiplexing (Timmermans et al. 2010) and next generation sequencing of long PCR amplicons (following Hinsinger et al. 2015) is efficient to obtain large mitogenomic datasets representative of both inter- and intraspecific variability, key to the understanding of mitochondrial evolution and a step closer to resolving the relationships among these taxa. [less ▲]

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See detailTraducción y retraducción al francés de Conversación en La Catedral
Belleflamme, Clémence ULiege

Conference (2017, July 09)

La ponencia se inscribe en el marco más amplio de una investigación de doctorado dedicada a la retraducción al francés de obras literarias hispanoamericanas de la segunda mitad del siglo XX. Además de una ... [more ▼]

La ponencia se inscribe en el marco más amplio de una investigación de doctorado dedicada a la retraducción al francés de obras literarias hispanoamericanas de la segunda mitad del siglo XX. Además de una parte teórica, dedicada a la noción traductológica de retraducción, la tesis constará de un estudio de casos, los de Pedro Páramo, de Juan Rulfo, y de Conversación en La Catedral, de Mario Vargas Llosa. Ambas novelas se tradujeron por primera vez al francés unos años después de su publicación y por segunda vez a principios del siglo XXI. Se investigarán tanto las estrategias editoriales como las estrategias de traducción, que un análisis textual de índole descriptivo debería permitirme deducir de manera inductiva a partir de las diferencias lingüísticas y pragmáticas que existen entre las distintas versiones. En esta ponencia, presento los primeros resultados del análisis textual comparativo de las versiones en francés de Conversación en La Catedral y formulo las primeras hipótesis en cuanto a los motivos para retraducir. [less ▲]

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See detailEvaluating flexibility and adequacy in future EU power systems: model coupling and long-term forecasting
Quoilin, Sylvain ULiege; Nijs, Wouter; Zucker, Andreas

in Proceedings of the 2017 ECOS Conference (2017, July 09)

There is an increasing need for improving the representation of the power system in energy system models. Recent research has shown that the economic value of each MWh of Variable Renewable Energy (VRE ... [more ▼]

There is an increasing need for improving the representation of the power system in energy system models. Recent research has shown that the economic value of each MWh of Variable Renewable Energy (VRE) declines with growing deployment. There are two main reasons for this: (1) even with limited shares of VRE, there is a reduced utilisation of dispatchable power plants and (2) with high shares of VRE, there can be possible excess electricity that might have to be curtailed in case of insufficient storage capacity. These findings tend to be completely ignored by models with low temporal resolution and high shares of VRE. In this work, we aim at endogenizing the flexibility constraints into long-term planning models (such as the JRC-EU-TIMES model) by taking profit of Dispa-SET, a unit commitment and optimal dispatch model. The main idea is to derive generic functions from Dispa-SET that can be used by JRC-EU-TIMES and all other energy system models. In particular, we evaluate the impact of increased variable renewable power and different configurations of power systems (production, storage, EVs, demand and flexible demand) (1) on the operations of power plants and the different storage options, determining their economics such as operating hours, number of cycles and (2) on the amount of possible excess power (power that has to be curtailed, stored, or transformed. Simulations are run in Dispa-SET for a wide set of exploratory configurations of the power system in Dispa-SET. Then, a statistical analysis of the results is performed to derive generic flexibility functions. An example of the use of such flexiblity function is finally proposed for a long-term simulation in the JRC-EU-TIMES model at the European level, showing a non-negligible impact on the value of VRE, on the utilization of dispatchable generation, and on the required storage capacity. [less ▲]

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See detailMémoire et "ouverture" : une analyse de la métaphore (spatiale et chirurgicale) dans Les taupes de Félix Bruzzone
Licata, Nicolas ULiege

Conference (2017, July 08)

À l’inverse d’Aristote, qui l’envisage comme un procédé rhétorique, Nietzsche fait de la métaphore un concept opératoire : une activité instinctive permettant d’accéder à l’essence des choses. Mais ... [more ▼]

À l’inverse d’Aristote, qui l’envisage comme un procédé rhétorique, Nietzsche fait de la métaphore un concept opératoire : une activité instinctive permettant d’accéder à l’essence des choses. Mais l’essence intime des choses, bien qu’indépendante de la métaphore en tant que moyen d’expression, se trouve en elle « comme le père par rapport à son fils », formule le philosophe allemand. Autrement dit, pour autant de fils, c’est-à-dire, de métaphores, que l’on possède, on ne dispose jamais que de dérivés de la chose, pas de la chose elle-même. D’où la nécessité de diversifier les métaphores pour tendre vers une perspective plus ample, plus compréhensive sur la chose. C’est d’ailleurs ce que fait Nietzsche lui-même dans ses essais. C’est aussi, il nous semble, ce que ferait Félix Bruzzone dans le roman ici considéré. Paru en 2008, Les taupes s’inscrit dans la tendance de la literatura de los hijos, ou « littérature des enfants » (sous-entendu, enfants de la dictature). Les caractéristiques qui distinguent ce roman des récits de mémoire traditionnels sont sa discontinuité et son imprévisibilité, ainsi que son langage métaphorique. Errance, voyage, maisons vides et tempêtes, travestisme, chirurgie, le livre contient diverses métaphores, métaphores au sens nietzschéen, large. Certaines d’entre elles sont décodables — on les appelle métaphores in presentia, car on en possède à la fois le « véhicule » et la « teneur » — ; d’autres demeurent absolument indéchiffrables — on nomme celles-là in absentia, car leur « teneur » fait défaut —. Un exemple de métaphore in presentia est le périple qu’effectue le protagoniste vers le sud. Descendre à Bariloche, c’est remonter dans un passé dont on ne peut, semble-t-il, s’extirper. D’un autre côté, on trouve un exemple éclatant de métaphore in absentia dans l’implant mammaire que subit ce même protagoniste dans les dernières pages du roman. Félix Bruzzone nous livre le véhicule de la métaphore mais garde pour lui sa teneur, et entre les deux, les possibilités sont presque infinies. La multiplication des métaphores dans Les taupes et, plus précisément encore, la présence d’une métaphore in absentia, mènent à s’interroger sur le procédé lui-même. Il est surprenant qu’à partir d’un matériau autobiographique Bruzzone produise un récit inachevé et codé. De fait les récits qui prennent pour sujet la dictature adoptent majoritairement la forme réaliste du témoignage. Mais le problème de ces récits est qu’ils reproduisent l’unicité du point de vue dictatorial qu’ils dénoncent. C’est ici que la définition nietzschéenne de la métaphore peut nous illuminer. Bruzzone, en diversifiant les métaphores, propose pour sa part un récit aux multiples points de vue : un roman « ouvert », au sens de collaboration théorique qu’Umberto Eco attribue à ce terme. Et quelle meilleure façon d’éviter le piège d’opposer à la dictature un autre point de vue unique, après tout, que d’inviter le lecteur à s’impliquer mentalement dans la réflexion à son sujet ? [less ▲]

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See detailHercules in the Art of Renaissance Flemish Tapestry
Laruelle, Anne-Sophie ULiege

Conference (2017, July 08)

The exploits of Hercules, one of the most popular literary and artistic themes of the Renaissance, flourished particularly in tapestries, a major artistic genre of this period. Fine tapestries presenting ... [more ▼]

The exploits of Hercules, one of the most popular literary and artistic themes of the Renaissance, flourished particularly in tapestries, a major artistic genre of this period. Fine tapestries presenting this theme were produced by the best weaving workshops of the former Netherlands. The success of the theme in tapestry invites us to ponder on the special meaning given to it by the princes, the privileged recipients of these tapestries. There is no doubt that, more than any other hero, Hercules served as their model as he embodied the virtus heroica. We will delve deeper in the matter by focusing on the period between the middle of the fifteenth century (when the theme first appears in tapestries) and the 1560s. In addition to the exceptional quantity of preserved tapestries (over a 100!), the numerous references to the Herculean theme in ancient inventories and descriptions confirms its importance at the time and reveals the complexity of its iconography. [less ▲]

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See detailEffects of a giant exercising board game intervention on ambulatory physical activity among nursing home residents: a preliminary study
Mouton, Alexandre ULiege; Gillet, Nicolas; Mouton, Flore et al

Conference (2017, July 08)

Purpose: This study examined the effects of a giant (4 meters by 3 meters) exercising board game intervention on ambulatory physical activity (PA) and on a broader array of physical and psychological ... [more ▼]

Purpose: This study examined the effects of a giant (4 meters by 3 meters) exercising board game intervention on ambulatory physical activity (PA) and on a broader array of physical and psychological outcomes among nursing home residents. Materials and methods: A quasi-experimental longitudinal study was carried out in two comparable nursing homes. Ten participants (aged 82.5 ± 6.3 and comprising 6 women) meeting the inclusion criteria took part to the one-month intervention in one nursing home, whereas eleven participants (aged 89.9 ± 3.1 with 8 women) were assigned to the control group in the other nursing home. The giant exercising board game required participants to perform strength, flexibility, balance and endurance activities. The assistance provided by an exercising specialist decreased gradually during the intervention in an autonomy-oriented approach, based on the self-determination theory (SDT). The following were assessed at baseline, after the intervention and after a follow-up period of three months: PA (steps/day and energy expenditure/day with ActiGraph, GT3X+), cognitive status (MMSE), quality of life (EQ-5D), motivation for PA (BREQ-2), gait and balance (Tinetti and SPPB), functional mobility (Timed Up and Go) and the muscular isometric strength of the lower limb muscles. Results and conclusions: In the intervention group, PA increased from 2921 steps/day at baseline to 3358 steps/day after the intervention (+14.9%, p = 0.04) and 4083 steps/day (+39.8%, p = 0.03) after three months. Energy expenditure/day also increased after the intervention (+110 kcal/day, +6.3%, p = 0.01) and after three months (+219 kcal/day, +12.3%, p = 0.02). Quality of life (p < 0.05), balance and gait (p < 0.05), and strength of the ankle (p < 0.05) were also improved after three months. Such improvements were not observed in the control group. The preliminary results are promising but further investigation is required to confirm and evaluate the longterm effectiveness of PA interventions in nursing homes [less ▲]

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See detailThe Intertextual Poetics and Politics of the Dramatic Monologue: From Mohsin Hamid’s The Reluctant Fundamentalist and Kamel Daoud’s Meursault, contre-enquête to Albert Camus’ La Chute (and Back)
Munos, Delphine ULiege

Conference (2017, July 07)

In Mohsin Hamid’s The Reluctant Fundamentalist, Changez, a Pakistani returnee from the US in a post 9/11 context, notes that “the confession that implicates its audience is […] a devilishingly difficult ... [more ▼]

In Mohsin Hamid’s The Reluctant Fundamentalist, Changez, a Pakistani returnee from the US in a post 9/11 context, notes that “the confession that implicates its audience is […] a devilishingly difficult ball to play. Reject it and you slight the confessor; accept it and you admit your own guilt.” Although Changez’s remark foregrounds his past uneasiness at the confessional tone regularly used by his Anglo-American boss, it also extends to the reader, who now occupies the “devilishingly difficult” position of the one who is being force-fed Changez’s confession – namely his “failed love-story” (Hamid) with the US. Both a confession of growing hatred towards the US and a dramatic monologue addressed to an unnamed American ‘you’, Hamid’s novel is highly influenced by the ‘I/you’ confessional dialectics wielded by Albert Camus in La Chute – a dialectics which is also taken up by Kamel Daoud in Meursault, contre-enquête, a rewriting of Camus’ L’Etranger that grants Meursaut’s victim a name and a story in today’s Algeria. Through a discussion of the intertextual genealogies between Hamid’s text and La Chute on the one hand, and between Daoud’s text, La Chute, and L’Etranger on the other, I wish to examine how Daoud’s and Hamid’s novels leave readers no choice but to negotiate conflicted identifications with the roles of ‘the confessor’ and ‘the listener’ in a context of growing Islamophobia, thus begging the question that Camus’ ‘existentialist’ texts have eluded, that is, to what extent empathy is framed by politics. [less ▲]

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See detailHealth and physical education from a European perspective
Cloes, Marc ULiege

Conference (2017, July 07)

At the end of the 20th century, several authors pointed out that physical education (PE) was crossing a crisis. The emphasis on the fight against a growing sedentariness of the society became ... [more ▼]

At the end of the 20th century, several authors pointed out that physical education (PE) was crossing a crisis. The emphasis on the fight against a growing sedentariness of the society became progressively one of the priorities of the national education leaders all around the world. In many countries, PE teachers had to implement new approaches in order to teach to the youth how to adopt a healthy lifestyle. Pre- and in-service PE teachers’ training started to propose programmes integrating health education in PE lessons while the reputation of the physical literacy concept spread quickly. Recently, Chin and Edginton (2014) invited scholars from 40 nationalities to describe the contemporary policies and practices of health and PE applied in their countries. Among those contributions, 23 concerned European countries. In this presentation, we will propose an overview of the trends that can be identified in this sample of European nations. Preliminary analysis underlines that combination of PE and health education is distributed along a continuum. At one extremity, PE’s input on health is not clearly expressed even if PE is expected to improve pupils and students’ health through selected activities like endurance training. At the opposite extremity, countries emphasize the role of the PE teacher as a health educator and not only through a limited focus on PA promotion and on the preparation of physically educated citizens. The second part of the paper will illustrate some actions that are undertaken in order to motivate the PE teachers to implement 'health enhanced physical activity' projects in their lessons. Such approaches respect principles associated with the concept of quality physical education (QPE). These PE classes should allow students to have positive individual and collective learning experiences where they develop knowledge, skills and dispositions that allow them to be autonomous and responsible decision makers relative to engagement in PA and sport in their lives (AIESEP, 2014). PE teachers need a new framework (Haerens et al., 2011) in order to leave their ingrained professional practices.. That starts by changing their representations on physical activity. Action-research, development of communities of practice, pedagogical cases and demonstration of the students’ interest for teaching approaches focusing on lifestyle aspects represent promising strategies to succeed in the process of changing the priorities. AIESEP (2014). 2014 AIESEP Position Statement on Physical Education Teacher Education. Available on Internet: http://aiesep.org/wp-content/uploads/2014/11/2014-AIESEP-Position-Statement-on-Physical-Education-Teacher-Education.pdf Chin, M.-K. & Edginton, C.R. (2014). Physical Education and Health Global Perspectives and Best Practice. Urbana, IL: Sagamore. Haerens, L., Kirk, D., Cardon, G., & De Bourdeaudhuij, I. (2011). Toward the Development of a Pedagogical Model for Health-Based Physical Education, Quest, 63:3, 321-338. [less ▲]

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See detailLes formes de structuration de l'espace "stade" par le croisement des discours du football et de la publicité
Bassilua Nzuzi, Anicet ULiege

Conference (2017, July 07)

Le croisement du football avec la publicité semble structurer l’espace stade en plusieurs dimensions. Deux critères sont ainsi repérés : une structuration verticale et une structuration horizontale. La ... [more ▼]

Le croisement du football avec la publicité semble structurer l’espace stade en plusieurs dimensions. Deux critères sont ainsi repérés : une structuration verticale et une structuration horizontale. La structuration verticale s’opère par exemple dans les stades construits sur plusieurs niveaux. On observe que l’installation des panneaux publicitaires y suit un ordre de grandeur croissant partant de bas vers le haut, divisant le stade en plusieurs espace-unités à valeur inégales (le rez-de-chaussée, le premier niveau, le deuxième niveau, etc.). La structuration horizontale est réalisée à partir, par exemple, des effets de distance que créent la situation du spectateur et la zone d’exposition du panneau publicitaire : le spectateur situé à un certain endroit (le rez-de-chaussée, par exemple) est parfois invité à exécuter certains mouvements (le plus souvent latéraux : regards à l’angle du profil en suivant le déplacement du ballon). Ce faisant, il découvre des panneaux publicitaires par un rythme hiérarchique et discriminatoire : certains panneaux sont bien découverts ; d’autres, il ne les découvre que très peu ; d’autres encore ils ne les découvrent pas du tout. (Un spectateur situé au rez-de-chaussée à la hauteur de la ligne médiane du terrain du côté de la tribune de presse et qui regarde le match, peut découvrir des panneaux publicitaires situés en face de lui lorsqu’il suit, par exemple, des séquences de passe qui se déroulent le long de la ligne de touche opposée: regard de face ; il découvre des panneaux placés derrières les buts lorsqu’il regarde un but qui s’exécute : regard de profil ; il ne voit pas du tout les panneaux situés en contrebas de son siège, par exemple les panneaux derrières les bancs des staffs techniques des équipes). Les espaces-unités construits par ces deux types de structuration deviennent en réalité des lieux d’attribution des compétences modales des sujets (pouvoir faire, devoir faire, vouloir faire, savoir faire), les spectateurs en l’occurrence, qui sont les cibles de la communication publicitaire. Cette attribution se réalise en fonction de quatre régimes de distribution modale des panneaux : régime d’exposition, régime d’accessibilité, régime d’inaccessibilité et régime d’obstruction. Il s’instaure ainsi tout un système de hiérarchisation du public qui vient assister à un match de football au stade, lequel se réalise notamment en fonction de leurs différents degrés d’exposition aux messages publicitaires et qui, par ailleurs, sont parfois rendus possible par la dimension narrative du jeu (l’exécution des séquences : but, passe, remise en jeu, remise de touche, etc.). Plusieurs cas de ce système de hiérarchisation adviennent au cours d’un match. Par exemple, lorsque la diffusion des messages publicitaires tient compte du type de public sollicité pour le découvrir. C’est le cas de la discrimination des messages qu’opèrent les annonceurs lorsqu’ils peuvent choisir d’orienter certains messages vers un public spécifique, celui installé dans la tribune d’honneur par exemple, à l’exclusion d’autres. Notre étude explore cette structuration de l’espace qu’opère au stade le croisement du football et la publicité, en recourant aux outils de sémiotique. Nous considérons entre autres le football et la publicité comme deux discours présentant des schémas énonciatifs et argumentatifs différents : celui fondé sur une logique de l’épreuve engagée entre deux équipes en situation ludique, pour le football, et celui basé sur une logique communicationnelle fondé sur un schéma argumentatif de type persuasif, pour la publicité. [less ▲]

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See detailAdvanced oxidative treatment for waste water contamined by pharmaceutical products
Belet, Artium ULiege; Vreul, Christelle; Gillard, Nathalie et al

Conference (2017, July 07)

The objective of this study is to determine operational processes for advanced oxidative treatment of waste waters contaminated with Pharmaceutical Products (PPs). The aim is to validate a physico ... [more ▼]

The objective of this study is to determine operational processes for advanced oxidative treatment of waste waters contaminated with Pharmaceutical Products (PPs). The aim is to validate a physico-chemical process combining ozonation and photocatalysis and that has to be placed downstream a classical biological treatment in existing waste water treatment plants (WWTP - domestic, industrial or hospital). [less ▲]

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See detailEVOLUTION OF SLUDGE INTERNAL STRUCTURE DURING DRYING: EFFECT OF THE CONDITIONING CONDITIONS
Fraikin, Laurent ULiege; Pambou, Yvon-Bert; Salmon, Thierry ULiege et al

Conference (2017, July 07)

This paper investigated the influence of dual conditioning of waste water treatment sludge on the evolution of sludge internal structure during convective drying. Results showed clearly an impact of ... [more ▼]

This paper investigated the influence of dual conditioning of waste water treatment sludge on the evolution of sludge internal structure during convective drying. Results showed clearly an impact of chemical conditioners on the evolution of the created porosity. For sludge flocculated by single conditioning, a centered porosity delimited by an external crust was shown, while for dual conditioning, a porosity structured in lamellae, was identified. [less ▲]

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See detailConstructing and performing the category of "rare disease": Multi-sited ethnography within some patients and relatives' organizations in Belgium
Duysens, Fanny ULiege

Conference (2017, July 07)

"Rare diseases" affect less than one person in 2000 in the European Union. In addition to this low prevalence rate, they are defined as being generally the object of insufficient knowledge and recognition ... [more ▼]

"Rare diseases" affect less than one person in 2000 in the European Union. In addition to this low prevalence rate, they are defined as being generally the object of insufficient knowledge and recognition, which often leads patients and their relatives to situations of diagnostic and therapeutic wandering. Then, many gather in some "rare diseases organizations" that aim at guiding concerned people in their health- and disease-related itineraries and at improving their quality of life. Drawing on a multi-sited ethnography conducted in Belgium, this communication presented some insights of the categorization work (Bowker & Star, 2000) operated by the "Rare Disease Organization" in Belgium in order to construct, consolidate, and expand a univocal category of "rare diseases". It particularly highlighted the mobilization of patients and relatives' narratives of lived experiences and common problematics as collective resources to categorize "rare diseases". Doing this, the organization tends to encompass the multiplicity and the variety of corresponding diseases, situations, experiences, and conceptions of patients and their relatives, in the aim of forming "a single front" and speaking from "a single voice" to publicized and make their claims heard. Moreover, the communication interrogated the articulation between the singularity of patients and relatives' narratives and the collective logic that they reflect (Douglas, 1986). How are rare diseases-related experiences exchanged within patients and relatives' organizations? How do they align with each other to transform them into collective resources to categorize "rare diseases"? What are the elements that make sense and what, conversely, is lost in this passage from the singularity to the collective? Moreover, what are the relationships between the narratives of patients and relatives and the wider social, political and medical contexts in which they are embedded? As a precision, this ongoing doctoral research fits into Science and Technology Studies, Anthropology of health and disease, and Sociology of knowledge. [less ▲]

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See detailSTUDY OF ACTIVATED SLUDGE DEWATERING : USING BIOBASED COAGULANTS
Fraikin, Laurent ULiege; Clermont, Quentin; Salmon, Thierry ULiege et al

Poster (2017, July 06)

This paper focuses on the dewatering efficiency of activated sludge from waste water treatment plant using biobased coagulants in addition with classical flocculant and compares the results with those ... [more ▼]

This paper focuses on the dewatering efficiency of activated sludge from waste water treatment plant using biobased coagulants in addition with classical flocculant and compares the results with those obtained with a sole classical coagulant. For this work, a standard compression-expression cell is used and an experimental design is develop to highlight the effect of the biobased coagulants. [less ▲]

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See detailIntegrated continuous flow photoreactors: Photooxidation of (L)-methionine with singlet oxygen
Emmanuel, Noémie ULiege; Monbaliu, Jean-Christophe ULiege

Conference (2017, July 06)

Development of photochemistry in macroscopic batch reaction vessels is hampered due to inherent limitations: light penetration remains superficial, resulting in inhomogeneous irradiation and hence to side ... [more ▼]

Development of photochemistry in macroscopic batch reaction vessels is hampered due to inherent limitations: light penetration remains superficial, resulting in inhomogeneous irradiation and hence to side-reactions or product degradation due to overexposure. The recent implementation of photochemical processes in microreactors under continuous-flow conditions appeared to be much more powerful than its batch analogue in terms of irradiation efficiency and light penetration. Furthermore, the fine control of residence time ensures an accurate control of the irradiation time, avoiding side-reactions and degradation. The scalable photooxidation of (L)-methionine with singlet oxygen using Rose Bengal as a sensitizer was successfully implemented in a microreactor setup and led to total and selective conversion into methionine sulfoxide, an important building block for the organic synthesis of peptides or functionalized amino acid. The reaction was performed in less than 1 min while the same reaction in batch took 2 h. Other substrates as α-terpinene or citronellol were also photooxidized into high added value compounds using the same conditions. [less ▲]

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See detailVers une politique de la ville en Wallonie (Belgique) : évolution socio-économique des villes wallonnes et recommandations
Claeys, Dorian ULiege; Descamps, Julien; Wilmotte, Pierre-François ULiege et al

Conference (2017, July 06)

The aim of the presentation is to present the recent trajectories of the urban neighbourhoods of 12 Walloon cities. The objective is to connect these evolutions with the urban development and policies of ... [more ▼]

The aim of the presentation is to present the recent trajectories of the urban neighbourhoods of 12 Walloon cities. The objective is to connect these evolutions with the urban development and policies of Walloon cities. [less ▲]

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See detailEmergence d’une Politique de la Ville en Wallonie en regard de la vision européenne
Mercenier, Chloé ULiege; Bianchet, Bruno ULiege; Ruelle, Christine ULiege et al

Conference (2017, July 06)

The aim of our presentation is to present some issues for Wallonia regarding to the urban strategy of European Union (European Council of Ministers and European Commission). We present these two ... [more ▼]

The aim of our presentation is to present some issues for Wallonia regarding to the urban strategy of European Union (European Council of Ministers and European Commission). We present these two strategies: the European (Urban Agenda/Pact of Amsterdam) and the Walloon strategies. We focus our communication on two regional specific issues: cooperation between municipalities ("supracommunalité") and the rehabilitation of residential and economic functions of urban neighbourhoods. [less ▲]

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See detailDéveloppement régional au départ des pôles extérieurs : typologie, enjeux et ressources territoriales en Wallonie
Wilmotte, Pierre-François ULiege; Bianchet, Bruno ULiege

Conference (2017, July 06)

The aim of our paper is to present how an European region can insert its region in some cross-border (potential) metropolitan and polycentric areas. Wallonia is interesting to understand a case where no ... [more ▼]

The aim of our paper is to present how an European region can insert its region in some cross-border (potential) metropolitan and polycentric areas. Wallonia is interesting to understand a case where no metropolitan centres are located in the region. The objective is to indicate how territorial resources are influenced by these foreign cities and the original combination of territorial resources in order to emerge a typology for the European regions. [less ▲]

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See detailD'un choc culturel à une conscience linguistique. Un cas d'apprentissage du japonais par le public francophone
Goto, Kanako ULiege

Conference (2017, July 06)

Comme J. Arnold et différents spécialistes l’attestent, le facteur émotionnel favorise l’environnement de l’apprentissage. L’on apprend plus vite, plus intensément et plus profondément. Alors, lorsqu’ un ... [more ▼]

Comme J. Arnold et différents spécialistes l’attestent, le facteur émotionnel favorise l’environnement de l’apprentissage. L’on apprend plus vite, plus intensément et plus profondément. Alors, lorsqu’ un apprenant francophone – qui vit avec une conception du monde occidentale (notamment à la française) - rencontre une langue « lointaine », celle de l’autre civilisation, à savoir une langue qui réfléchit à la verticale, qui ne précise pas le sujet, qui est à la fois laconique et équivoque…bref, celle qui se trouve à l’opposé de l’horizon cartésien, quel genre d’alchimie se produirait ? Et quel est le rôle de l’enseignant dans tout cela ? Dans cet exposé, des réflexions issues de l’expérience de l’enseignement du japonais pour le public francophone de ces 5 dernières années seront passées en revue. La rencontre entre ces deux langues, très différentes, ne pourra point se faire sans provoquer de « choc » culturel. Et ce choc même, semble-t-il, constituerait l’élément décisif qui favorise l’environnement de l’apprentissage du japonais, la langue souvent qualifiée d’être très éloignée du français par son côté ambigu, obscur et qui cherche l’harmonie plutôt que la distinction. Parmi les différents facteurs qui influenceront l’impact émotionnel dans l’apprentissage du japonais par les Francophones, le choix adéquat de matières (corpora) sera particulièrement mis en avant. Quelques corpora propres à la langue japonaise (ex : onomatopées, façons de dire « non » à la japonaise, dictons) semblent être pertinents afin d’éveiller la curiosité de l’apprenant. Et ce déclic générerait l’intérêt chez ce dernier, ce qui l’incite à travailler consciencieusement cette nouvelle langue. Notre exposé aspire également à suggérer que cette prise de conscience linguistique – acquise grâce à l’apprentissage d’une langue étrangère – amènerait l’apprenant à réfléchir sur des caractéristiques de sa langue maternelle et de son fonctionnement, ancrés dans une culture et une société définies. [less ▲]

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See detailUn dispositif de formation initiale des enseignants en didactique des mathématiques au niveau du secondaire supérieur en Belgique francophone
Balhan, Kevin ULiege; Gérard, Isaline; Nguyen, Giang et al

Conference (2017, July 05)

L'article présenté lors du symposium fédère plusieurs recherches menées dans notre laboratoire de didactique des mathématiques : le « Ladimath », autour de la formation initiale des enseignants de ... [more ▼]

L'article présenté lors du symposium fédère plusieurs recherches menées dans notre laboratoire de didactique des mathématiques : le « Ladimath », autour de la formation initiale des enseignants de mathématique au niveau du lycée et, plus particulièrement, autour d’une question de recherche qui concerne une dimension particulière de la « réflexivité » : « les mathématiques comme problème professionnel ». Nous y décrivons le dispositif mis en place dans la formation initiale des enseignants en mathématique à l’Université de Liège, celui-ci étant alimenté de différentes manières selon l’épistémologie du savoir mathématique questionné lors de la formation. Dans cet article, nous l’illustrons sur trois thèmes différents : celui de l’analyse mathématique, de la géométrie, et des probabilités/statistiques. [less ▲]

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See detailHow are youth philanthropy practices transforming the philanthropic field?
Dessy, Elodie ULiege; Xhauflair, Virginie ULiege

Conference (2017, July 05)

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See detailLes relations de pouvoir dans l’accompagnement des demandeurs d’emploi par les intermédiaires privés de l’emploi
Gérard, Julie ULiege

Conference (2017, July 04)

Cette contribution s’intéresse à la mise en oeuvre de l’accompagnement des demandeurs d’emploi, en tant que politique sociale visant la (ré)insertion socioprofessionnelle des personnes éloignées de ... [more ▼]

Cette contribution s’intéresse à la mise en oeuvre de l’accompagnement des demandeurs d’emploi, en tant que politique sociale visant la (ré)insertion socioprofessionnelle des personnes éloignées de l’emploi par une lutte contre le chômage de longue durée et l’exclusion sociale. Plus précisément, elle porte un intérêt singulier aux relations de pouvoir qui s’exercent, dans les échanges et les interactions, entre les intermédiaires privés du marché du travail et leurs usagers, dès la phase de sélection des projets d’accompagnement. Cette contribution s’attèle dès lors à rendre compte des formes de contrôle qu’exercent les intermédiaires privés dans la concrétisation de leur action d’insertion lorsqu’ils sont contraints de respecter les orientations européennes en matière de profilage. Elle repose, par conséquent, sur l’analyse des ressorts et des effets de pouvoir en considérant l’influence de pressions institutionnelles induites par le contexte de rationalisation et d’efficacité à l’intérieur duquel la prise en charge des demandeurs d’emploi est réalisée.Ce faisant, cette contribution s’attache à illustrer l’influence de l’action d’intermédiation exercée sur les transitions des demandeurs d’emploi par la présence de deux effets de trappe, étayés par l’activation de mécanismes de filtrage à différents moments de l’accompagnement. Par ce biais, elle vise à rendre compte de la logique structurelle qui oriente les transitions professionnelles des usagers vers une forme de « précariat social » sur le marché du travail. Elle s’appuie, pour ce faire, sur une recherche empirique de nature qualitative, menée entre septembre 2013 et juin 2015, en Belgique Francophone, auprès de six structures privées spécialisées dans l’accompagnement vers et dans l’emploi. [less ▲]

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See detailMaximal voluntary isometric contraction tests for normalizing surface EMG of scapular stabilizers muscles
Schwartz, Cédric ULiege; Tubez, François ULiege; Soulier, Maxime et al

Conference (2017, July 04)

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See detailConditions, apports et limites du e-tutorat dans un dispositif de formation hybride
Denis, Brigitte ULiege

in Rinaudo, Jean-Luc (Ed.) Symposium du REF - Téléprésence en éducation (2017, July 04)

Un des enjeux de la formation à distance en formation d’adultes est de mettre en place des dispositifs répondant aux besoins des apprenants, respectant des principes andragogiques et procurant un ... [more ▼]

Un des enjeux de la formation à distance en formation d’adultes est de mettre en place des dispositifs répondant aux besoins des apprenants, respectant des principes andragogiques et procurant un environnement de qualité pédagogique (activités, ressources...) et ergonomique. De plus, le tutorat est un facteur primordial dans la mise en œuvre de tels dispositifs. Procurant un sentiment de présence (Jacquinot, 2002), fournissant un soutien (socio-affectif, cognitif, organisationnel...) à l’apprenant, il influence sa persévérance et l’atteinte de ses objectifs. Cette étude traite de la médiation entre e-tuteurs et apprenants dans un dispositif de formation hybride (certificat d'université en gestion de dispositifs techno-pédagogiques innovants). La mise en place de ce dernier a impliqué d’une part un processus d’ingénierie pédagogique incluant une médiatisation des savoirs (ressources) et des activités à distance (consignes, outils de communication, de dépôt de travaux, etc.) et, d’autre part, un processus d’ingénierie tutorale (Rodet, 2010). Les e-tuteurs ont été formés (Denis, 2003) et se sont accordés sur leur profil d’interventions vis-à-vis des apprenants. En outre, des réunions de concertation ont été organisées à plusieurs reprises durant la formation afin de réguler, au besoin, les interventions tutorales. Le principe de ce dispositif est de s’ancrer dans le projet personnel du participant. Il prévoit au fil de la formation des interactions régulières entre un e-tuteur et son (ses) tutoré(s) sur base d’un carnet de route (Roadbook) hebdomadaire complété en ligne. Ces interactions ont généralement lieu par courriel ou via l’annotation de documents partagés. Par ailleurs, les tutorés reçoivent également de la part des formateurs des feedback écrits personnalisés au fur et à mesure de la rentrée de leurs travaux. Ces derniers, ainsi que leurs réflexions tout au long du processus de formation, sont compilés dans leur Roadbook. Les conditions, apports et limites du e-tutorat dans ce dispositif seront appréhendées à partir de l’analyse des Roadbooks des apprenants et d’interviews de l’un d’entre eux ainsi que des e-tuteurs. [less ▲]

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See detailLes organismes d’insertion socioprofessionnelle mis à l’épreuve des dispositifs techniques de l’action publique
Gérard, Julie ULiege

Conference (2017, July 04)

Cette contribution porte un intérêt singulier aux enjeux relatifs à l’externalisation de l’accompagnement des demandeurs d’emploi, en tant que mesure d’activation, auprès d’organismes privés d’insertion ... [more ▼]

Cette contribution porte un intérêt singulier aux enjeux relatifs à l’externalisation de l’accompagnement des demandeurs d’emploi, en tant que mesure d’activation, auprès d’organismes privés d’insertion socioprofessionnelle en Belgique francophone. Plus précisément, elle s’intéresse à l’influence de dispositifs techniques dans la concrétisation de leur mission de réinsertion. Pour ce faire, elle porte une attention particulière à l’analyse des relations de pouvoir qui s’exercent, à distance, entre les services publics de l’emploi et les prestataires privés, par le biais de technologies afin de coordonner et de contrôler l’activité déléguée. Elle s’attache, dès lors, à rendre compte des différentes formes de pression institutionnelle qui émanent de ces technologies, à différentes phases de l’accompagnement, sous-tendant un mouvement de standardisation de l’action publique. Par ce biais, cette contribution démontre à quel point la standardisation et les indicateurs chiffrés deviennent de véritables outils de pouvoir destinés à évaluer tant la performance des opérateurs privés que l’efficacité de leur action. Par ce gouvernement par les instruments, les organismes privés sont à présent confrontés à un nouveau modèle de gouvernance qu’il convient de s’approprier et/ou de contourner. Partant de ces constats, notre raisonnement sera guidé autour de deux questions : quel est l’effet de ces dispositifs techniques dans le travail quotidien d’accompagnement des opérateurs privés ? Et de quelle marge de manoeuvre disposent-ils pour se les réapproprier et contourner les contraintes qui en résultent ? De la sorte, cette contribution s’inscrit dans une approche analytique qui s’attache à rendre compte des jeux de pouvoir en présence, en appréhendant l’accompagnement au concret, saisi dans ses actions de suivi et d’opérationnalisation. [less ▲]

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See detailUnsteady pressure distributions on a 4:1 rectangular cylinder: comparison of numerical and experimental results using decomposition methods.
Guissart, Amandine ULiege; Andrianne, Thomas ULiege; Dimitriadis, Grigorios ULiege et al

Conference (2017, July 04)

Detached flows around bluff bodies are ubiquitous in civil engineering applications. In this work, the flow around a static 4:1 rectangular cylinder at moderate Reynolds number and at different angles of ... [more ▼]

Detached flows around bluff bodies are ubiquitous in civil engineering applications. In this work, the flow around a static 4:1 rectangular cylinder at moderate Reynolds number and at different angles of incidence is studied using both Experimental Fluid Dynamics (EFD) and Computational Fluid Dynamics (CFD). Typically, the integration of EFD and CFD allows a better understanding of the flow of interest by leveraging the complementary of their respective outputs. However, the comparison of computational and experimental results is an important but difficult step of this integration, particularly in the case of local quantities related to unsteady flows. In this work, decomposition methods are used to compare unsteady loads and pressure distributions coming from EFD and CFD. In particular, Proper Orthogonal Decomposition (POD) and Dynamic Mode Decomposition (DMD) are used to extract the dominant structures of the aerodynamic coefficients. The experimental data are obtained from dynamic pressure measurements in wind tunnel while numerical data come from two-dimensional unsteady Reynolds-Averaged Navier-Stokes (uRANS) simulations and tri-dimensional Delayed-Detached Eddy Simulations (DDES). This work shows that the decomposition methods represent a powerful tool enabling the analysis and the quantitative comparison of the main spatial and temporal characteristics of unsteady flows. Moreover, the accuracy of uRANS and DDES results is analyzed in light of the capacity of both CFD techniques to capture the reattachment occurring on the upper part of the rectangular cylinder. [less ▲]

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See detailUsing amino acid stable isotopes to estimate trophic position
Sturaro, Nicolas ULiege

Conference (2017, July 04)

Estimating the trophic positions of animals in food webs is useful in addressing many fundamental ecological and ecotoxicological questions. These estimates are generally based on gut content and stable ... [more ▼]

Estimating the trophic positions of animals in food webs is useful in addressing many fundamental ecological and ecotoxicological questions. These estimates are generally based on gut content and stable isotope analyses, which have become essential tools for ecotoxicologists. While these tools have proven their usefulness, they involve several pitfalls that can result in large errors in the estimation of animals’ trophic positions. Relatively recently, these tools were improved with the analysis of the compound-specific amino acid nitrogen stable isotopes. The approach is based on the fact that certain amino acids (e.g., glutamic acid) exhibit metabolic isotope fractionation and others (e.g., phenylalanine) are incorporated into the tissues of consumers in a conservative manner. Indeed, amino acids of the latter category exhibit only a small change in their nitrogen isotope composition, which is similar to that found in primary producers. Therefore, the trophic position of an animal species is estimated based on a comparison of the nitrogen isotope composition of these two groups of amino acids from a single organism. This lecture will try to show the potential of the compound-specific stable isotope analysis of amino acids to illustrate food-web structure and estimate trophic positions in wild animal populations. It will summarize recent advances from field and laboratory studies and present case studies taken from the aquatic environment. In addition, this lecture will discuss the benefits, current limitations and analytical challenges related to this approach, which continues to open new research routes in many fields of ecology, including ecotoxicology. [less ▲]

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See detailFor your ka! How to give something as a present to the tomb owner?
Motte, Aurore ULiege

Conference (2017, July 04)

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