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See detailRole of phenotypic plasticity and local adaptation in allowing cave exploitation: ecological and evolutionary insights from the fire salamander
Manenti, Raoul; Melotto, Andrea; Tagliaferro, L. et al

Conference (2016, August 31)

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See detailLandscape diversity, better for biodiversity? - hoverflies and butterflies in different agri-environment schemes
Pécheur, Emilie ULg; Piqueray, Julien; Dopagne, Claude ULg et al

Conference (2016, August 31)

In Europe, agri-environment schemes (AES) are designed to give credit to environmental issues in agricultural practices. Among the different Walloon AES, some are dedicated to enhance and preserve ... [more ▼]

In Europe, agri-environment schemes (AES) are designed to give credit to environmental issues in agricultural practices. Among the different Walloon AES, some are dedicated to enhance and preserve biodiversity linked to the agroecosystems. This study wishes to explore, at a landscape scale, how do different AES perform regarding butterflies and syrphidae diversity. Data collection occurred in five categories of ecological infrastructures (EI): four types of agri-environmental schemes (grassy strips, wildflower strips, bird-feeding margins, species-rich meadows) and cereal crops. Five replicates were selected for each category. Syrphidae were collected in water traps once per month, from May to July. Butterflies were monitored along transects from May to Augustus. Plant species were identified in every plot, within a 1-m radius around the traps and along a transect through every plot. Preliminary results show that abundance and species diversity of butterflies is significantly higher in parcels with floral resources. Moreover, hosts plants for larvae and foraging plants for adults are significantly more present in two types of AES: the wildflower strips and the species-rich meadows. Regarding the identified plant species, categories are divided in three groups (crops apart): bird-feeding margins; species-rich meadows and grassy strips; wildflower strips (Fig.1). Concerning hoverflies, a significantly higher abundance is observed in the wildflower strips compared to the crops in June (p= 0.008). Other abundance values in May and July show no difference. These results suggest that wildflower strips are performing infrastructures for biodiversity conservation in agroecosystems. As the presence of floral resources seem to be an important factor for the presence of foraging of adults, attention should be paid to the provisioning of food resources for the larval stages, especially butterflies, at a landscape scale in order to assure a sustainable approach in biodiversity support. [less ▲]

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See detailSuperconductors used as trapped field magnets : investigation of hybrid structures combining superconducting and ferromagnetic materials
Vanderbemden, Philippe ULg; Fagnard, Jean-François ULg; Caps, Hervé ULg et al

Conference (2016, August 30)

In addition to their unique ability to carry electric currents without loss, superconductors are able to trap significant magnetic flux densities at low temperature. In so-called type-II irreversible ... [more ▼]

In addition to their unique ability to carry electric currents without loss, superconductors are able to trap significant magnetic flux densities at low temperature. In so-called type-II irreversible superconductors, these properties are due to the pinning of individual flux lines (vortices) by defects at the nanoscale level. In this talk the influence of pinning on the magnetic properties of bulk superconductors will be explained and illustrated, with the emphasis placed on how pinning can be exploited to produce “trapped field magnets” for practical applications. We will then show how the properties of these trapped field magnets are enhanced when superconductors (SC) are combined to soft ferromagnetic (FM) alloys [1,2]. In particular we investigate the properties of macroscopic FM/SC/FM structures where the superconductor is sandwiched between two ferromagnetic sections, one of each circular face. In particular we show how the properties of the whole structure is influenced by the saturation magnetization and the geometry of the ferromagnetic material. References: 1. M P Philippe, J-F Fagnard, S Kirsch, Z Xu, A R Dennis, Y H Shi, D A Cardwell, B Vanderheyden, and P Vanderbemden, Magnetic characterisation of large grain, bulk Y–Ba–Cu–O superconductor–soft ferromagnetic alloy hybrid structures. Physica C: 502 (2014) 20-30. 2. M P Philippe, M D Ainslie, L Wera, J-F Fagnard, A R Dennis, Y H Shi, D A Cardwell, B Vanderheyden, and P Vanderbemden, Influence of soft ferromagnetic sections on the magnetic flux density profile of a large grain, bulk Y–Ba–Cu–O superconductor. Superconductor Science and Technology: 28 (2015) 095008. [less ▲]

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See detailA hidden Markov model to estimate inbreeding from whole genome sequence data
Druet, Tom ULg; Gautier, Mathieu

Conference (2016, August 29)

Inbreeding results from the mating of related individuals and has negative consequence because it brings together deleterious variants in one individual. Inbreeding is associated with recessive diseases ... [more ▼]

Inbreeding results from the mating of related individuals and has negative consequence because it brings together deleterious variants in one individual. Inbreeding is associated with recessive diseases and reduced production or fitness. Until recently inbreeding was estimated with genealogical data, which have some limitations. Genomic estimates of inbreeding can now be obtained thanks to new technologies. Methods based on genomic relationships assume either that identical-by-state markers are identical-by-descent (IBD) or correct for the allele frequencies estimated in a « founder generation ». Similarly, with runs of homozygosity (ROH), the hypothesis is that stretches of homozygous markers longer than a determined threshold (measured in number of markers or in Mb) are IBD. Although sequencing data are more informative, most of the recent studies used genotyping data. Due to high genotyping errors rates with sequencing technologies, ROH are difficult to use on such data. We herein describe an original method to model inbreeding along chromosomes. It relies on a hidden Markov model that determines locally whether a segment is inbred and gives a measure of inbreeding's age. The method uses a function modeling the probability to observe a genotype in an inbred segments. It is well suited for sequencing data because the function incorporates genotyping errors and uncertainty associated with low or moderate coverage. We first determine the properties of our new method with different simulation scenarii. Then, we use it to estimate inbreeding in the Belgian Blue Beef cattle population with either genotyping arrays (of various densities) or whole genome sequencing data. The estimates will be compared to those obtained with other methods (pedigree, ROH, genomic relationship). Latest results will be presented. [less ▲]

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See detailSeasonal variation in human brain function
Vandewalle, Gilles ULg

Conference (2016, August 25)

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See detailHow do we understand Smart City? An Evolutionary Perspective
Crutzen, Nathalie ULg; Kummitha, Rama

Conference (2016, August 25)

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See detailNormative data on teachers’ voice use in real-life situations
Schiller, Isabel ULg; Morsomme, Dominique ULg; Alcoulombre, Anaëlle et al

Conference (2016, August 25)

Background As part of their working routine, teachers use their voice for extended periods of time. To compensate for adverse acoustic conditions and background noise, they are also required to speak at ... [more ▼]

Background As part of their working routine, teachers use their voice for extended periods of time. To compensate for adverse acoustic conditions and background noise, they are also required to speak at high intensities. Since teaching is acknowledged to be vocally demanding, several studies have investigated teachers’ vocal load, that is, the stress inflicted on the larynx during vocalization, which is thought to be influenced by duration, intensity and frequency of phonation. A promising method for analyzing teachers’ phonatory behavior in real-life situations is the use of a portable voice dosimeter that objectively documents vocal parameters. Depending on several factors, those parameters may vary within the teaching profession (Masuda et al., 1993; Morrow and Connor, 2011; Remacle, Morsomme, and Finck, 2014). With the aim of quantifying their vocal parameters and identifying the most at-risk teaching conditions, we have established a large database of French-speaking teachers. Based on this database, this study analyzed vocal loading differences with regard to gender, teaching level, and environment (professional versus extra-professional). Methods Seventy-six French-speaking teachers (15 males and 61 females) were monitored during one workweek using the Ambulatory Phonation Monitor voice dosimeter (KayPENTAX). The subjects included 21 kindergarten, 20 primary and 35 secondary school teachers. All male subjects were in the latter group. The vocal parameters analyzed were phonation time, intensity and fundamental frequency (F0). Results The statistical analysis revealed that, irrespective of gender, phonation time, F0 and intensity level were significantly higher in the professional environment than the extra-professional environment (p<.01). Among female subjects, the F0 of kindergarten teachers was significantly higher than that of primary school teachers, which in turn was higher than that of secondary school teachers (p<.01). The phonation time and intensity were also higher in female kindergarten teachers than other female teachers, but this difference did not reach significance. As expected, regarding gender differences, we found that female secondary school teachers spoke with significantly higher F0 than their male colleagues (p<.001). In the extra-professional setting, they also spoke with a significantly higher intensity (p<.05), but no such effect was found in the professional environment. Conclusion Overall, our subjects showed an increase in vocal loading parameters when they were at work compared to their free time. This confirms the results of earlier studies and demonstrates that teaching is an occupation with remarkably high vocal demands. The analysis of mean frequency showed that lower school levels were associated with higher-pitched voice. It can be assumed that kindergarten teachers adapt to the higher F0 of their young pupils and that their effort to maintain the pupils’ attention results in greater frequency variations. References Masuda, T., Ikeda, Y., Manako, H., & Komiyama, S. (1993). Analysis of vocal abuse: Fluctuations in phonation time and intensity in 4 groups of speakers. Acta Oto-Laryngologica, 113(3), 547–552. Morrow, S. L., & Connor, N. P. (2011). Comparison of voice-use profiles between elementary classroom and music teachers. Journal of Voice, 25(3), 367–372. Remacle, A., Morsomme, D., & Finck, C. (2014). Comparison of vocal loading parameters in kindergarten and elementary school teachers. Journal of Speech, Language, and Hearing Research, 57(2), 406–415. [less ▲]

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See detailOccurrence rates of invasive plants in limestone quarries (Southern Belgium)
Pitz, Carline ULg; Jorion, Alexis ULg; Mahy, Grégory ULg et al

Conference (2016, August 23)

In quarries, invasive plant species can slow down the installation of high conservation value vegetation. Successful management of invasive requires, at first, a quantitative assessment of invasion levels ... [more ▼]

In quarries, invasive plant species can slow down the installation of high conservation value vegetation. Successful management of invasive requires, at first, a quantitative assessment of invasion levels. Although European legislation has adopted an ambitious strategy against invasive species, there is still a lack of knowledge about their occurrence in quarries. The aim of this study was to evaluate occurrence rates of invasive plant species in limestone quarries throughout Wallonia (Southern Belgium) and identify high priority and emerging invasive plants for adapted management. During 2016 vegetation period, forty quarries were selected by stratified sampling, using abandoned and active quarries as strata. Within selected quarries, two-meter wide transects were established to cross all activity sectors. Transects were divided in 10x2m plots, resulting in 2% of total surface of each quarry being surveyed. Cover and number of individuals of invasive plants species were recorded in each plot. Species considered were those of Harmonia list (67 species), the reference at the Wallonia scale. More than 30 000 plots were surveyed. Results of our recent study are presented (occurrences rates by species, mean percentage cover per site). First results indicate that dominant invasive species originate from different introduction paths: (i) planted (Robinia pseudoacacia); (ii) ornamentals (Cotoneaster horizontalis) and (iii) spontaneous colonization (Senecio inaequidens) - and follow various invasion dynamics. We propose research and management methods to be directed towards limitation of top ten frequent species (e.g. Buddleia davidii, Senecio inaequidens), and to establish a detection system for the emerging invasive plants. [less ▲]

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See detailLa santé psycho-sociale des adolescents à l’épreuve de l’immigration : le cas des jeunes d’origine marocaine et turque en Belgique.
Gavray, Claire ULg

Conference (2016, August 23)

Cette communication s’appuie sur les analyses effectuées au départ des données belges de l’enquête ‘International Study on Self-reported Delinquency’. Nous investiguons la question du mal-être ... [more ▼]

Cette communication s’appuie sur les analyses effectuées au départ des données belges de l’enquête ‘International Study on Self-reported Delinquency’. Nous investiguons la question du mal-être psychologique desadolescents autochtones et allochtones (via échelle réduite de dépression des adolescents de Moos) encomparaison et en lien avec leur contexte social, affectif et relationnel. Nous affinons l’analyse en ce qui concerne les jeunes d’origine turque et marocaine vivant en Belgique, sachant que si les deux sous-groupes nationaux partagent de nombreuses expériences dans leurs relations aux différentes sphères sociales, leur groupe d’origine se caractérise aussi par des stratégies économiques et d’insertion qui peuvent différer. Nous discutons le résultat selon lequel, malgré un contexte social et historique plus favorable, les jeunes d’origine belge manifestent une tendance dépressive plus prononcée que les autres et la conclusion selon laquelle ce n’est pas automatiquement et exactement les mêmes facteurs socio-relationnels qui expliquent le niveau de dépression dans chacun des groupes étudiés. [less ▲]

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See detailIs the observer effect significant in vegetation assessment of restored metallicolous grassland?
Boisson, Sylvain ULg; Mahy, Grégory ULg

Conference (2016, August 22)

Projects that prospects habitat restoration require protocols of vegetation assessment to monitor the evolution of the restored ecosystems over time. In most cases, multiple assessors are needed and some ... [more ▼]

Projects that prospects habitat restoration require protocols of vegetation assessment to monitor the evolution of the restored ecosystems over time. In most cases, multiple assessors are needed and some studies have shown that the variability among observer can be significant. In the context of tropical grassland, few studies quantified the impact of the observer on the results, reducing the capacity to replicate conclusions, and, therefore to plan restoration strategies at large scale. This study aims to quantify the variation among observers using two phytosociological methods on restored metallicolous grassland and to test whether variation in the assessment could involve the conclusions of the vegetation assessment. Four observers were selected to perform monitoring of quadrats in two distinct habitats identified in four restored ecosystems. All observers sampled seven metrics based on phytosociological methods and two of them also performed a complete vegetation sampling of the quadrat, including species identification and cover in quadrat. For metrics based on cover, variation of measure exists among the observers. For metrics based on counting, no variation is highlighted and the observers are able to distinguish and identify species. These results emphasize that a same method could lead to distinct results according to observer and, in restoration projects, it is crucial to ensure a correct transfer of protocols of vegetation assessment in order to reproduce equally the method. [less ▲]

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See detailPassive Linearization of Nonlinear System Resonances
Habib, Giuseppe ULg; Grappasonni, Chiara ULg; Kerschen, Gaëtan ULg

Conference (2016, August 22)

In this work we demonstrate that the addition of properly-tuned nonlinearities to a nonlinear system can increase the range over which a specific resonance responds linearly. Specifically, we seek to ... [more ▼]

In this work we demonstrate that the addition of properly-tuned nonlinearities to a nonlinear system can increase the range over which a specific resonance responds linearly. Specifically, we seek to enforce two important properties of linear systems, namely the force-displacement proportionality and the invariance of resonance frequencies. Theoretical findings are validated through numerical simulations and experiments. [less ▲]

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See detailOne pot synthesis by plasma treatment of Pt-based catalysts for PEM fuel cells
Busby, Yan; Gulas, Michal; Laurent-Brocq, Mathilde et al

Conference (2016, August 22)

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See detailDesign of microstructures using stress-based topology optimization
Collet, Maxime ULg; Bruggi, Matteo; Noël, Lise ULg et al

Conference (2016, August 22)

This paper aims at designing microstructures using stress-based topology optimization. Most of the developments so far have been made for compliance design in various field of applications as reflected in ... [more ▼]

This paper aims at designing microstructures using stress-based topology optimization. Most of the developments so far have been made for compliance design in various field of applications as reflected in the literature. The emergence of the new additive manufacturing techniques allows to consider porous material, such as lattice structures for instance, which ca be used for the design of structural components subject to various solicitations. Those components must account for the stress level to prevent failure everywhere in the microstructures and by extension the whole structure itself. This work proposes to design such microstructures using topology optimization with limitation on the stress level within the microstructures before printing the result. The homogenization technique is used to determine the equivalent material properties. The issues and perspectives are also discussed. [less ▲]

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See detailLe projet EpistolART à la lumière de certaines lettres évoquant Léonard de Vinci
Delfosse, Annick ULg; Fagnart, Laure ULg

Conference (2016, August 19)

Le projet EpistolART – dont nous sommes co-promotrices, avec Paola Moreno et Dominique Allart – explore le matériau épistolaire artistique de la première modernité. Dans ce cadre, le "Carteggio inedito ... [more ▼]

Le projet EpistolART – dont nous sommes co-promotrices, avec Paola Moreno et Dominique Allart – explore le matériau épistolaire artistique de la première modernité. Dans ce cadre, le "Carteggio inedito d’artisti dei secoli XIV, XV, XVI" que Johann Wilhelm Gaye a publié en 1839-1840 constitue l’un de nos corpus privilégiés. Méritoire, le travail de Gaye n’en demeure pas moins dépassé : aussi l’équipe EpistolART a-t-elle entrepris d'éditer à nouveaux frais ce corpus, en suivant les critères de la philologie, de la codicologie et de la paléographie moderne, et de reverser cette édition dans une base de données en ligne. Durant notre intervention, nous voudrions d’abord vous présenter la base de données EpistolART (travail éditorial, heuristique, conception de la base de données) puis nous arrêter sur quelques lettres évoquant Léonard de Vinci dont les membres du projet EpistolART proposent une nouvelle édition. Ces missives constituent des documents extrêmement précieux pour écrire l’histoire des relations entre le maître florentin et la France, spécialement avec le roi Louis XII, qui appelle l’artiste à son service en 1506. Si les historiens qui se sont penchés sur la vie et l’œuvre de Léonard de Vinci connaissent ces correspondances, rares sont ceux qui ont recouru aux documents épistolaires originaux. Or, ce n’est qu’au départ d’un texte sûr, appréhendé tant dans sa matérialité que dans ses contenus, que peuvent se déployer des analyses scientifiquement fondées. [less ▲]

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See detailAspects fonciers de l'exil des religieux français en Belgique (1901-1914)
Murez, Jean-Baptiste ULg

Conference (2016, August 19)

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See detailAggiornamento historiographique sur Godefroid Kurth (XIXème siècle-2016)
Genin, Vincent ULg

Conference (2016, August 19)

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See detailEditing Thomas More’s Utopia (Louvain, T. Martinus, 1516): an example of Erasmian networks in action
Adam, Renaud ULg

Conference (2016, August 19)

Theodoricus Martinus Alostensis published the editio princeps of Thomas More’s Utopia at the end of the year 1516 in Louvain. Why did the English humanist give his text to this printer and not to someone ... [more ▼]

Theodoricus Martinus Alostensis published the editio princeps of Thomas More’s Utopia at the end of the year 1516 in Louvain. Why did the English humanist give his text to this printer and not to someone like Johann Froben in Basel or Jodocus Badius Ascensius in Paris? In fact, Thomas More didn’t choose Theodoricus Martinus randomly, but had been guided by his friend Erasmus, who was living in Brabant at that time and was working directly with this printer. The humanist from Rotterdam then instructed his circle to monitor closely the printing of the text, to do the proofreading and to direct the publishing. He involved in this process his friend Petrus Aegidius – clerk of city of Antwerp and close friend of both More and Erasmus – and Gerardus Geldenhower. By studying the correspondence of Erasmus, we will first rebuild the process of printing the first edition of the Utopia. This will also be an opportunity to discover the role and the importance of a network of humanists within the workshop of a printer. Without this, Theodoricus Martinus would never have been able to build his identity as a “printer humanist” and to transform his workshop into one of the leading places for the diffusion of humanism in the Low Countries in the first decades of the 16th century. [less ▲]

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See detailLes enquêtes de terrain du Musée de la Vie wallonne : Un outil au service de la collecte de la mémoire, des savoirs et savoir-faire régionaux
Postula, Jean-Louis ULg

Conference (2016, August 19)

Débutées dans les années 1920, la réalisation de reportages sur le terrain puis la diffusion régulière des résultats de ces recherches ont été pendant longtemps l’un des traits distinctifs de la fonction ... [more ▼]

Débutées dans les années 1920, la réalisation de reportages sur le terrain puis la diffusion régulière des résultats de ces recherches ont été pendant longtemps l’un des traits distinctifs de la fonction scientifique mise en œuvre au Musée de la Vie wallonne. Jusqu’à la fin des années 1980 environ, les activités du Service des enquêtes ont permis au Musée de devenir le conservatoire d’une collection unique en son genre de documents d’archives multimédia – photographies, films et sons. La rénovation du Musée à partir de 2004, assortie de la réorientation de son projet muséal vers le modèle du « musée de société », a été l’occasion d’investir à nouveau du temps et des moyens dans la relance de cette riche tradition d’enquêtes ethnographiques. Grâce à de nombreux exemples, cette communication ambitionne de montrer l’évolution des terrains d’enquêtes du Musée, qui privilégie désormais l’exploration de nouvelles thématiques liées aux enjeux contemporains de nos sociétés urbaines, industrielles et post-industrielles. Oscillant entre continuité et renouvellement, les enquêtes du Musée de la Vie wallonne permettent à l’institution de se profiler comme un contributeur influent à la préservation du patrimoine culturel immatériel de notre région. [less ▲]

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See detailBackground subtraction and background generation
Van Droogenbroeck, Marc ULg

Conference (2016, August 15)

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See detailInvestigating the Effect of Plant Root Exudates and of Saponin on Polycyclic Aromatic Hydrocarbons Solubilization in Brownfield Contaminated Soils
Davin, Marie ULg; Fauconnier, Marie-Laure ULg; Colinet, Gilles ULg

Conference (2016, August 08)

In Wallonia, there are 6,000 estimated brownfields (rising to over 3.5 million in Europe) that require remediation. Polycyclic Aromatic Hydrocarbons (PAHs) are a class of recalcitrant carcinogenic ... [more ▼]

In Wallonia, there are 6,000 estimated brownfields (rising to over 3.5 million in Europe) that require remediation. Polycyclic Aromatic Hydrocarbons (PAHs) are a class of recalcitrant carcinogenic/mutagenic organic compounds of major concern as they accumulate in the environment and represent 17% of all encountered pollutants. As an alternative to environmentally aggressive, expensive and often disruptive soil remediation strategies, a lot of research has been directed to developing techniques targeting organic pollutants. The following experiment, based on the observation that PAHs soil content decreases in the presence of plants, aimed at improving our understanding of the underlying mechanisms involved in phytoremediation. It focusses on plant root exudates and whether they improve PAHs solubilization, which would make them more available for bioremediation by soil microorganisms. The effect of saponin, a natural surfactant found in some plant roots such as members of the Fabaceae family, on PAHs solubilization was also investigated as part of the implementation of the experimental protocol. The experiments were conducted on soil collected from a brownfield in Saint-Ghislain (Belgium) and presenting weathered PAHs contamination. Samples of soil were extracted with different solutions containing either plant root exudates or commercial saponin. Extracted PAHs were determined in the different aqueous solutions using High-Performance Liquid Chromatography and Fluorimetric Detection (HPLC-FLD). Both root exudates of alfalfa (Medicago sativa L.) or red clover (Trifoliumpratense L.) and commercial saponin were tested in different concentrations. Distilled water was used as a control. First of all, results show that PAHs are more extracted using saponin solutions than distilled water and that the amounts generally rise with the saponin concentration. However, the amount of each extracted compound diminishes as its molecular weight rises. Also, it appears that passed a certain surfactant concentration, PAHs are less extracted. This suggests that saponin might be investigated as a washing agent in polluted soil remediation techniques, either for ex situ or in situ treatments, as an alternative to synthetic surfactants. On the other hand, preliminary results on experiments using plant root exudates also show differences in PAHs solubilization compared to the control solution. Further results will allow discussion as to whether or not there are differences according to the exudates provenance and concentrations. [less ▲]

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See detailAlternative electron transport to oxygen in green microalgae during induction and steady-state photosynthesis
Franck, Fabrice ULg; de Marchin, Thomas; Fratamico, Anthony ULg et al

Conference (2016, August 06)

In this study, we used combined fluorescence-based electron transport and oxygen measurements during steady-state photosynthesis to evaluate the responses to low and high CO2 in Chlamydomonas reinhardtii ... [more ▼]

In this study, we used combined fluorescence-based electron transport and oxygen measurements during steady-state photosynthesis to evaluate the responses to low and high CO2 in Chlamydomonas reinhardtii grown in photobioreactors at different light intensities. We present a method to quantify alternative electron transport to O2 from the relationship between the apparent quantum yields of oxygen evolution and of electron transport at PSII while taking into account the variations in the proportion of energy absorbed by PSII. We used this approach to evidence a significant O2-dependent alternative electron transport in low CO2 cells. We showed that this alternative electron transport represented up to 60% of the total electron transport in low CO2 cells even when the CO2 limitation had been removed by bicarbonate addition. In contrast, no significant alternative electron transport was detected in high CO2 cells. We also analysed alternative electron transport to O2 and its relationship with the fluorescence induction process during photosynthetic induction after dark-adaptation in several microalgal species. We show that a distinct sub-phase of the fluorescence decline after the fast OJIP rise is caused by alternative electron transport to O2 and is dependent on the pre-acclimatation of the cells to different CO2 supply conditions. The involvement of mitorespiration, chlororespiration and FLV proteins in alternative electron transport to O2 is discussed on the basis of results obtained with mutants, inhibitors and FLV protein expression. [less ▲]

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See detailOn the effect of microstructural anisotropy on the mechanical and thermophysical properties of Ti6Al4V processed by Laser Beam Melting
Mertens, Anne ULg; Paydas, Hakan ULg; Rigo, Olivier et al

Conference (2016, August 05)

Laser beam melting (LBM) is a strongly directional process in which a metallic powder is deposited layer by layer in a powder bed and molten locally according to the desired shape. When processing Ti6Al4V ... [more ▼]

Laser beam melting (LBM) is a strongly directional process in which a metallic powder is deposited layer by layer in a powder bed and molten locally according to the desired shape. When processing Ti6Al4V, it is well known that the latest layer tends to solidify epitaxially on the previous layers, thus giving rise to elongated columnar primary β(BCC) crystals extending over several successive layers. These primary β grains then transforms into the α(HCP) structure upon cooling. The present work aimed at studying the microstructural anisotropy of LBM Ti6Al4V, as well as its consequences on the mechanical and thermophysical properties (i.e. thermal expansion and thermal conductivity). In order to gain a deeper undestanding of thermal phenomena in the LBM of Ti6Al4V, great care was also taken to characterize the thermophysical properties over a wide temperature range from room temperature. [less ▲]

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See detailLes limites de la papyrologie : papyrologie et enseignement universitaire
Marganne, Marie-Hélène ULg

Conference (2016, August 05)

Which dangers is Papyrology exposed to? How to overcome these obstacles? Assets. Disadvantages. Ideas for Solutions.

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See detailPlaying RPG Maker? Amateur Game Design and Video Gaming
Hurel, Pierre-Yves ULg

Conference (2016, August 04)

Game creation tools like Game Maker or RPG Maker democratize game making and facilitate the development of amateur game design. The best known among these programs have dynamic web-communities with active ... [more ▼]

Game creation tools like Game Maker or RPG Maker democratize game making and facilitate the development of amateur game design. The best known among these programs have dynamic web-communities with active members making thousands of games. However, as of now, there is little research on amateur game design except for modding or education fields. In this paper I argue that approaching amateur game making in these relations with video game playing allows a better understanding of game creation tools’ users. To support my argument, I will lean on the early results of the exploratory step of my ongoing research. [less ▲]

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See detailINVESTIGATION OF 238U, 235U, 137CS AND 133XE IN SOILS FROM THE UNIVERSITY OF DOUALA-CAMEROON
Ndontchueng Moyo, Maurice; Guembou Shouop, Cébastien Joel ULg; Ngelem Mekontso, Eric Jilbert et al

Conference (2016, August 04)

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See detailETUDE DE FAISABILITE DU PROJET D’ECLAIRAGE PUBLIC PAR DES LAMPADAIRES SOLAIRES DU CAMPUS 2 DE L’UNIVERSITE DE DOUALA
Koagne Nkuate, Michael; Guembou Shouop, Cébastien Joel ULg; Djaowe, Samuel

Conference (2016, August 04)

Dans le cadre de sa politique énergétique et de promotion des énergies renouvelables, le Gouvernement Camerounais, à travers le Ministère de l’Eau et de l’Energie (MINEE), a fait appel à l’expertise des ... [more ▼]

Dans le cadre de sa politique énergétique et de promotion des énergies renouvelables, le Gouvernement Camerounais, à travers le Ministère de l’Eau et de l’Energie (MINEE), a fait appel à l’expertise des sociétés « Chinoise et vietnamienne (HUAWEI), en vue de le soutenir dans le programme du développement de son potentiel énergétique. Pourtant, un certain nombre d’entreprises locales (SINTEC 3D, K&M ENGINEERING, TECHNO CAMER …) s’intéressent de plus en plus à la valorisation et à la vulgarisation des énergies renouvelables. Pour ce faire, nous avons pensé à la proposition du savoir-faire, de la disponibilité locale d’une main d’œuvre qualifiée en matière d’électrification par énergie solaire. Ceci a l’endroit des institutions, des bailleurs de fond, des ONG ainsi qu’aux autorités étatiques Camerounaises. Nous avons ainsi travaillé sur des thèmes tels que : Modèle d’électrification rurale pour localités de moins de 1000 habitants l’extrême nord Cameroun ; méthode simple de calcul et de choix des équipements solaires pour une application domestique ; ainsi que sur le thème étude de faisabilité du projet d’éclairage public par des lampadaires solaires au campus 2 de l’université de douala. C’est ainsi qu’une mission d’étude s’est rendue au sein du Campus en janvier 2016. Les détails de cette mission sont présentés dans les annexes ci-jointes. Plusieurs objectifs sont lies à cette etude: éclairer les espaces (au sein du Campus 2 de l’université de Douala) allant de l’amphi Stanislas Melonné jusqu'à la faculté des sciences passant par l’ENSET et par l’amphi George Gango par des lampadaires solaires. Le projet permettra d’accroitre la disponibilité et la sécurité de l’approvisionnement en énergie tout en valorisant et en vulgarisant les énergies renouvelables (devenu de plus en plus incontournables). Ce projet a également pour but de promouvoir les nouvelles technologies pour un développement durable du Cameroun (programme mondial des énergies propres) et de faire valoir les ressources naturelles et humaines disponibles (soleil en permanence, jeunes ingénieurs de l’ISS,…). [less ▲]

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See detailLes rouleaux composites répertoriés dans le Catalogue des papyrus littéraires grecs et latins du CEDOPAL
Marganne, Marie-Hélène ULg

Conference (2016, August 04)

Les rouleaux littéraires composites préfigurent-ils les codices miscellanei tels que définis par Edoardo Crisci (Segno e Testo, 2, 2004, pp. 109-144) ? Après avoir examiné les quelques exemplaires ... [more ▼]

Les rouleaux littéraires composites préfigurent-ils les codices miscellanei tels que définis par Edoardo Crisci (Segno e Testo, 2, 2004, pp. 109-144) ? Après avoir examiné les quelques exemplaires répertoriés dans le Catalogue des papyrus littéraires grecs et latins du CEDOPAL (http://cipl93.philo.ulg.ac.be/Cedopal/MP3/dbsearch.aspx), leur nature, leur présentation et l'organisation de leur contenu, on s'est interrogé sur leur contexte de production et d'utilisation en vue de répondre à cette question. [less ▲]

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See detailFrom practice-based game research to game design as a cultural technique
Werning, Stefan; Kamp, Michiel; De Smale, Stephanie et al

Conference (2016, August 02)

Panel : de Smale, Stephanie: Game Essays in the Digital Humanities : The paper addresses the use of prototyping for creating game essays, the applicability of game essays within a digital humanities ... [more ▼]

Panel : de Smale, Stephanie: Game Essays in the Digital Humanities : The paper addresses the use of prototyping for creating game essays, the applicability of game essays within a digital humanities framework and the challenges and opportunities of taking a research-centric rather than a player-centric perspective on game design. Kamp, Michiel: Parameters of Musical Interaction in Games : The paper proposes exploring game music by experimenting with the ways in which the soundtrack responds to game states and player interaction beyond adapting analytical techniques borrowed from film music studies, like masking or replacing parts of the soundtrack. Hurel, Pierre-Yves: Amateur Game Design as Reflexive Practice : The paper presents an ethnographic perspective on amateur game design with a particular focus on the use of distinct tools such as RPG Maker and their affordances for reflective practice. Werning, Stefan: From Analytical Play to Analytical Game Design : The paper outlines the transition from intrinsically analytical aspects in (meta-)ludic practices (speed-running, in-game photography, cosplaying, let’s playing etc.) to game design as a cultural technique, i.e. a mode of expression and civic engagement in a gamified society. [less ▲]

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See detailDetection of nitrogen stress on winter wheat by multispectral machine vision
Marlier, Guillaume ULg; Gritten, Fanny; Leemans, Vincent ULg et al

Conference (2016, August 01)

Hand-held sensors (SPAD meter, N-Tester, …) used for detecting the leaves nitrogen concentration (Nc) present several drawbacks. The nitrogen concentration is gained by an indirect way through the ... [more ▼]

Hand-held sensors (SPAD meter, N-Tester, …) used for detecting the leaves nitrogen concentration (Nc) present several drawbacks. The nitrogen concentration is gained by an indirect way through the chlorophyll concentration and the leaves have to be fixed in a defined position for the measurements. These drawbacks could be overcome by an imaging device that measures the canopy reflectance. Hence, the objective of the paper is to analyse the potential of multispectral imaging for detecting nitrogen concentration. The tests were carried out on parcels submitted to nitrogen inputs varying from 0 to 180 kg N.ha-1. Reference Nc measurements were obtained by the Kjeldahl method and a Hydro N-Tester (Yara). The developed imaging system comprised a CMOS camera and a set of 22 interference filters ranging from 450 to 950 nm mounted on a wheel steered by a stepper motor. The image acquisition and the motor rotation were controlled by a program written in C++. The crop was imaged vertically at one meter height. The raw images presented 1280×1024 pixels covering an area of approximately 0.25 m² and were recorded with a 12-bit luminance resolution. To deal with the natural irradiance variability of the scene, a white reference was used and the integration time was automatically adjusted for each image. The image treatment included the segmentation of Photosynthetically Active Leaves (PAL) by using Bayes theorem and the computation of the mean PAL reflectance after correction of background and illumination fluctuations. Nc was estimated on the basis of the 22 filters by the Partial Least Square (PLS) method and by four filters selected by the Best Subset Selection (BSS) method. In comparison with the Kjeldahl method, the estimation of Nc by means of the Hydro N-Tester, the PLS method and the BSS method (filters 600-80, 950-100, 650-40 and 450-80 nm) gave determination coefficients equal to 0.53, 0.63, and 0.62, respectively. This indicated that the full multi-spectral approach gave significantly better Nc estimation than a portable device and suggested that a camera equipped with four filters would give similar results. [less ▲]

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See detailHabitat use of an unstudied Lepilemur in the northwest Madagascar: L. mittermeieri
Wilmet, Leslie ULg; Vermeulen, Cédric ULg; Beudels-Jamar et al

Conference (2016, August)

Biodiversity and endemism is very high in Madagascar and Genus Lepilemur is part of the endemic mammalian fauna of the island. Sportive lemurs have small distribution ranges, fairly small total ... [more ▼]

Biodiversity and endemism is very high in Madagascar and Genus Lepilemur is part of the endemic mammalian fauna of the island. Sportive lemurs have small distribution ranges, fairly small total populations and are particularly negatively affected by deforestation and habitat fragmentation, serious threats for the biological diversity of the island. Our research focus on one poorly-known taxon, Lepilemur mittermeieri. The distribution range of this endangered species is restricted to the Ampasindava peninsula in the northwest Madagascar and ecological information is essential for its preservation. The main objective of our study is to analyze habitat use and niche characteristics of the species and the impact of habitat degradation and fragmentation on these parameters in order to design robust conservation guidelines for the Ampasindava peninsula. In this talk, we will present the project as a whole and results of two 4-months field missions conducted in 2015 and in 2016. These field missions were designed to specifically 1)compare home range size between two sites 2)complete forest characterization of the home range of several radio-collared individuals. The methodology includes the monitoring of 16animals equipped with radio-collar (VHS telemetry) during 6hours per night for a number of days, GPS locations being recorded every 10 minutes. The home range is derived from the telemetry observation through MCP method. [less ▲]

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See detailThe dual action of neuroestrogens on sexual behavior
Cornil, Charlotte ULg

Conference (2016, August)

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See detailThe prosumers and the grid
Gautier, Axel ULg

Conference (2016, August)

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See detailA population approach to evaluate grassland restoration - a systematic review
Harzé, Mélanie ULg; Monty, Arnaud ULg; Boisson, Sylvain ULg et al

Conference (2016, August)

How do we know if restoration goals are achieved? In practice, the criteria used to evaluate the success of restoration actions are numerous and can be defined at different ecological scales, i.e. at the ... [more ▼]

How do we know if restoration goals are achieved? In practice, the criteria used to evaluate the success of restoration actions are numerous and can be defined at different ecological scales, i.e. at the population, community or ecosystem level. Most studies about restoration success monitoring assessed attributes corresponding to the community or ecosystem levels like species diversity, vegetation structure and ecological processes. Has the population approach been disregarded to evaluate restoration success? This systematic review of the literature aimed to identify how often plant population traits were used to monitor restoration of grasslands. Practically, 3133 papers were reviewed among which 1065 reported monitoring of plant species after a restoration action. Only 153 papers used a population approach and represent the core of this review. Detailed results and paper content will be presented with the aim to identify restoration protocols (with or without species addition), species of interest, population attributes and processes considered to evaluate restoration success. [less ▲]

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See detailEvolution of biological innovations in early complex cells
Javaux, Emmanuelle ULg

Conference (2016, August)

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See detailMicroorganisms and semiochemicals to manipulate aphidophagous predators
Verheggen, François ULg

Conference (2016, August)

Semiochemicals provide a powerful way for organisms to communicate and coordinate their behaviors. But they also represent opportunities for other organisms to intercept and exploit such signals. There ... [more ▼]

Semiochemicals provide a powerful way for organisms to communicate and coordinate their behaviors. But they also represent opportunities for other organisms to intercept and exploit such signals. There are now numerous examples of natural enemies eavesdropping the intraspecific communication of their prey to better locate them. Aphid natural enemies, including predators and parasitoids, frequently exhibit innate responses to chemical cues reliably associated with aphids, and there is also abundant evidence that learning of profitable chemical cues frequently occurs. Thenceforth, the efficiency of aphid natural enemies to locate their prey is mainly based on their ability to perceive and orientate toward aphid-associated semiochemicals. Aphid predators were shown to respond to different groups of aphid-related semiochemicals, including aphid-induced plant volatiles; aphid pheromones and the more recently identified bacteria-produced honeydew volatiles. These laboratory studies suggest potentially promising avenues for the deployment of aphid-associated semiochemicals for the management of these pest species. While laboratory experiments are invaluable tools for revealing mechanisms, additional field studies are however needed to test ecological relevance of the observed effects. Although it is now possible to attract naturally occurring aphid predators in a crop field using semiochemicals, future work should more fully explore the broader ecological context in which signaling occurs. The information gained from a deeper understanding of the chemical ecology of aphid-natural enemy interaction will enhance our understanding of the chemical biology and ecology of aphids, and may facilitate the design of novel control strategies. [less ▲]

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See detailLa parentalité dans un contexte de violence conjugale : support de résilience ?
Glowacz, Fabienne ULg

Conference (2016, August)

L’accès à la parentalité, quels que soient le contexte social ou conjugal et l’histoire de la femme, s’avère une étape-clé de transition dans la trajectoire personnelle. Le fonctionnement parental est ... [more ▼]

L’accès à la parentalité, quels que soient le contexte social ou conjugal et l’histoire de la femme, s’avère une étape-clé de transition dans la trajectoire personnelle. Le fonctionnement parental est influencé par trois types de facteurs interagissant entre eux : la personnalité du parent (elle-même influencée par son histoire développementale), les caractéristiques individuelles de l'enfant et les sources de soutien et de stress de l'environnement (Belsky,1984).Les recherches sur la parentalité et la résilience se sont principalement centrées sur la résilience des enfants ayant vécu des traumatismes tels que les abus sexuels, où la résilience est activée par la disponibilité et le soutien parental ( Glowacz et Buzitu, 2014). Nos récentes études portant sur les trajectoires de femmes ayant vécu des traumatismes majeurs (violences conjugales, violences de guerre) nous conduisent à considérer l’accès à la parentalité comme un turning point, déclencheur d’un processus de résilience de ces femmes. Des analyses cliniques seront mises en perspective avec des données de recherches ayant évalué le sentiment de compétence parentale (incluant le sentiment d’efficacité et le sentiment de satisfaction), le stress parental et le soutien social perçu de femmes ayant vécu ces traumatismes. Nos observations et résultats nous amènent à questionner la résilience de la mère et les résonances de cette résilience sur l’enfant en développement. [less ▲]

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See detailBack to the Future of Dioxin Analyses
Patterson Jr, D; Focant, Jean-François ULg

Conference (2016, August)

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See detailPhonological acquisition in CLIL- and non-CLIL education
Rasier, Laurent ULg

Conference (2016, August)

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See detailHeart Team Session
PIERARD, Luc ULg; LANCELLOTTI, Patrizio ULg; PETERMANS, Jean ULg et al

Conference (2016, August)

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See detailStructural design under damage constraints with XFEM and level sets
Noël, Lise ULg; Duysinx, Pierre ULg; Maute, Kurt

Conference (2016, August)

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See detailL'Alliance stratégique entre les acteurs étatiques et non-étatiques au Moyen-Orient : Le cas de l'Alliance entre l'Iran, la Syrie et le Hezbollah.
Bayramzadeh, Kamal ULg

Conference (2016, July 28)

L’Alliance stratégique entre les acteurs non-étatiques et étatique au Moyen-Orient : le cas du Hezbollah libanais avec l’Iran et la Syrie et son rôle dans le conflit syrien ; Depuis 1979, il y a une ... [more ▼]

L’Alliance stratégique entre les acteurs non-étatiques et étatique au Moyen-Orient : le cas du Hezbollah libanais avec l’Iran et la Syrie et son rôle dans le conflit syrien ; Depuis 1979, il y a une alliance entre le régime iranien et le régime syrien. Le moteur principal de cette alliance a été au départ l’hostilité de ces deux régimes aux Etats-Unis, au régime irakien (Saddam Hussein), et à Israël. Mais après la chute du régime irakien en 2003, il y a eu un changement dans les relations entre ces deux pays et l’Irak, mais l’hostilité à l’égard des Etats-Unis et de l’Etat hébreu a continué. Le caractère durable des relations entre l’Iran et la Syrie est lié aux facteurs stratégique et géopolitique et notamment à l’existence de l’ennemi commun et aux menaces sécuritaires. Dans le conflit syrien, les acteurs de cette alliance en particulier l’Iran a joué un rôle important. Pour comprendre la position de l’Iran au sujet du conflit syrien, il est important d’observer que depuis la Révolution de 1979, la Syrie occupe une place très importante dans la stratégie diplomatique régionale de l’Iran, car la Syrie permet au régime iranien d’accéder au monde arabe et de jouer en particulier un rôle dans la vie politique libanaise par le biais du Hezbollah : la fondation de ce parti politique est l’une des conséquences de la politique d’exportation de la révolution iranienne. Selon le régime iranien, la Syrie, le Hezbollah et l’Iran font partie de « l’axe de la résistance » à Israël. Dans ce sens la Syrie joue un rôle important dans les relations entre l’Iran et le Hezbollah qui est le bras armé du régime iranien au Liban. C’est pourquoi la Syrie est la profondeur stratégique de l’Iran dans sa rivalité avec l’Etat hébreu. De ce fait, le renversement du régime syrien contribuerait à la diminution de l’influence de l’Iran. L’Iran affiche sans tarder un appui visible (par l’envoi de matériels et de personnels) au régime de Damas car il craint les répercutions d’un effondrement de son allié principal. L’éviction du clan alaouite risquerait de mettre en place un pouvoir à majorité sunnite pas favorable au Hezbollah, ni à la République islamique. Dans cette présentation, nous allons d’abord voir le rôle du Hezbollah au Liban ainsi que ses fondements idéologiques. Ensuite nous allons analyser sa place dans la stratégie régionale de l’Iran et son rôle dans l’Alliance avec l’Iran et la Syrie notamment dans le conflit syrien. [less ▲]

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See detailGroundwater flow and transport modelling at regional scale: lessons learned from different applications in the Walloon Meuse basin
Dassargues, Alain ULg; Goderniaux, Pascal; Orban, Philippe ULg et al

Conference (2016, July 28)

An overview is proposed of the recent groundwater modelling works, at the groundwater body scale, performed by the Hydrogeology & Environmental Geology team of the University of Liège. The developed ... [more ▼]

An overview is proposed of the recent groundwater modelling works, at the groundwater body scale, performed by the Hydrogeology & Environmental Geology team of the University of Liège. The developed modelling tools are built in the general objective of improving our understanding and management, at short, middle and long terms, of the groundwater bodies. The general strategy to be followed implies that conceptualization, parameterization and calibration must be adapted to the actual objectives of each model (Wildemeersch et al., 2014). 3 specific applications are illustrated involving two main groundwater bodies: - application of the HFEMC method (Wildemeersch et al., 2010) within the SUFT3D code for groundwater flow modelling of the ‘Synclinorium of Dinant’ (Orban et al., 2010 and Brouyère et al., 2011); - application of the HFEMC method and the SUFT3D code for the nitrate trends (Batlle-Aguilar et al., 2007) simulations in the Geer basin (Orban et al., 2010) for different scenarios of nitrate inputs; - application of the HGS integrated model for assessing the impact of climate change on the groundwater reserves in the Geer basin (Brouyère et al., 2004, Goderniaux et al., 2009 and 2011) with quantification and comparison of the different uncertainty sources (Goderniaux et al., 2015) Lessons and perspectives are learned and proposed from these modelling experiences at the scale of the groundwater body. [less ▲]

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See detailEffect of Mechanical Loading on Peri-Implant Bone Remodeling Measured with Time-Lapsed Imaging and Finite Element Analysis
Li, Zihui; Betts, Duncan; Kuhn, Gisela et al

Conference (2016, July 28)

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See detailRepetition and Negation as Dialogic Devices in Caryl Phillips's "Northern Lights"
Tunca, Daria ULg

Conference (2016, July 28)

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See detailHow groundwater interactions can influence UPSH (Underground Pumping Storage Hydroelectricity) operations
Bodeux, Sarah ULg; Pujades, Estanislao ULg; Orban, Philippe ULg et al

Conference (2016, July 28)

In the current energy grid, renewable energy has an increasing role to play. However, their intermittence cannot afford to regulate the produced electricity according to the irregular demand (Evans et al ... [more ▼]

In the current energy grid, renewable energy has an increasing role to play. However, their intermittence cannot afford to regulate the produced electricity according to the irregular demand (Evans et al., 2012). Pumped Storage Hydroelectricity (PSH) is a well-known efficient technology to store and release electricity according to the demand needs but appropriate potential new sites are getting scarce (Steffen, 2012). An innovative alternative consists in using abandoned mines as lower reservoir of an Underground Pumping Storage Hydroelectricity (UPSH) plant. In such configuration, large amount of water will be pumped or injected in underground cavities, creating subsequently head oscillations in the surrounding aquifers. Consequently, this seepage occurring between the considered cavity and the varying groundwater heads in the surrounding geological medium may influence the efficiency of the UPSH plant but also the magnitude of the potential impacts on the groundwater resources. A hybrid 3D finite element mixing cell method (Brouyère et al., 2009) is used to simulate numerically the use of a representative UPSH cavity and calculate the induced changes in groundwater heads in the surrounding geological medium. Different scenarios are computed varying parameter values (hydrogeological and lower reservoir characteristics), boundary conditions, and pumping/injection time-sequences. By analyzing the computed piezometric heads at different distances from the underground reservoir, the magnitude of the aquifer response to pumping storage operations is assessed. The most expected and noticeable effect is the oscillation of groundwater levels. The existence a mean pseudo/ dynamic steady-state and the required time to reach it are also determined. The head difference and its time evolution between the cavity and the surrounding medium is triggering the leakage of groundwater into the cavity or the contrary. The resulting effects on the UPSH plant efficiency can be estimated. Combining these outcomes, some feasibility criteria of this type of projects are identified. Going into practice, further models should include more in de-tails local and specific geometrical and hydrogeolog-ical data of the considered old mine cavities used as lower reservoir. This kind of modelling approach can be used as a first approach for determining how the aquifer will response to short and long term changes in UPSH pumping/injection schemes. [less ▲]

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See detailNitrate dynamic and pathways in fractured limestone aquifers : From soil leaching to groundwater discharge in surface water
Briers, Pierre ULg; Schmit, Flore; Orban, Philippe ULg et al

Conference (2016, July 27)

Fractured – karstified limestone aquifers constitute important, but vulnerable groundwater reservoirs in many areas across the World. Such carbonate systems are highly heterogeneous leading to a high ... [more ▼]

Fractured – karstified limestone aquifers constitute important, but vulnerable groundwater reservoirs in many areas across the World. Such carbonate systems are highly heterogeneous leading to a high spatial and temporal variability of fluxes across the soil – vadose zone – groundwater – surface water continuum. One of the main challenges worldwide is to protect such groundwater bodies from diffuse pollutions, in particular agricultural chemicals such as nitrate. To face such problems and to propose adequate pollution mitigation scenarios, the objective here was to better understand and quantify nitrate dynamics and pathways in the subsurface and at the groundwater – surface water interface. The transfer of nitrate was investigated in different ways such as monitoring of concentrations in both groundwater and surface water, tracer experiments in the unsaturated – saturated continuum and regional investigations on groundwater chemistry including stable isotopes of nitrate and other compounds. Results show that nitrate concentrations are relatively stable both in groundwater and surface water during the low flow period (i.e. from spring to autumn). A temporary but significant increase in nitrate concentration is observed in groundwater and rivers during the winter, related to release of residual nitrate from agricultural soils driven by infiltration water. In period of high precipitations and runoff, dilution is measured in the river. Monitoring and tracer test results also highlight the fact that the migration of dissolved contaminants across the unsaturated zone of limestone rocks is very fast and governed by gravitational flows. In the rivers, macroinvertebrates and benthic diatoms were sampled at several sites to assess ecological status and structural and functional response to alteration of water quality (nutrient enrichment) and quantity (current velocity and stream habitats). Diatom indices and community structure indicated good to very good status in both studied streams, indicating that elevated nitrate concentration have no detectable effect on biological quality of the surface waters. The combination of all these results allows developing a detailed conceptual model of the dynamics of nitrate (and other agricultural contaminants) in fractured / karstified limestone aquifers, with improved estimates of nitrate trends and dynamics in both groundwater and rivers. [less ▲]

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See detailL’instrumentation de la mémoire en Belgique : Comment les autorités publiques francophones et flamandes influencent-elles le jeu mémoriel ?
Nossent, Jérôme ULg

Conference (2016, July 27)

Les études mémorielles identifient généralement les mémoires collectives comme transmises au travers de groupes particuliers (familles, collectivités, nations,…et communautés). Parmi ces groupes, certains ... [more ▼]

Les études mémorielles identifient généralement les mémoires collectives comme transmises au travers de groupes particuliers (familles, collectivités, nations,…et communautés). Parmi ces groupes, certains peuvent se prévaloir de l’institutionnalisation des mémoires, faisant d’elles des mémoires collectives officielles, par le biais de politiques mémorielles. Les autorités publiques peuvent effectivement être considérées comme initiatrices de telles politiques, recourant pour ce faire à de multiples instruments mémoriels : commémorations, lois dites « mémorielles » ou autres instruments législatifs. En mars 2009, la Communauté française de Belgique s’est dotée d’un tel instrument mémoriel, le « décret mémoire ». Celui-ci vise à la transmission de la mémoire de crimes d’envergure (dont les génocides) et de la résistance à leurs instigateurs, par la promotion de certains organismes et activités. De l’autre côté de la frontière linguistique belge, la Communauté flamande s’est dotée, en 2008, d’un « Comité spécial d'éducation à la mémoire ». Ce Comité spécial organise la promotion d'activités en lien avec diverses mémoires. Les approches adoptées par les autorités publiques de part et d’autre de la frontière linguistique peuvent toutefois être étudiées en vis-à-vis, dans une perspective comparée. En interrogeant les similitudes et les divergences, les rôles des autorités publiques, les moyens et les buts poursuivis, la communication cherche à savoir si les cadres institués permettent l’égal soutien de mémoires plurielles ou, au contraire, s’ils rendent l’accès à celui-ci plus inégalitaires. [less ▲]

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See detailPolitiques mémorielles et contraintes juridiques
Grandjean, Geoffrey ULg

Conference (2016, July 27)

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See detailMonitored tracer experiment using the vadose zone experimental setup (VZES) for studying water and pollutant recharge processes in a brownfield
Fernandez de Vera, Natalia ULg; Beaujean, Jean; Jamin, Pierre ULg et al

Conference (2016, July 26)

Contaminant transport characterization in the vadose zone of industrial contaminated sites requires in situ technologies that provide information representative of complex heterogeneous systems. However ... [more ▼]

Contaminant transport characterization in the vadose zone of industrial contaminated sites requires in situ technologies that provide information representative of complex heterogeneous systems. However, finding the appropriate methodology is a challenge, as there is a risk of losing data resolution when capturing the spatial variability of the subsurface. An alternative method is provided by The Vadose Zone Experimental Setup (VZES) which combines surface and cross-borehole geophysical methods with a vadose zone monitoring system (VMS). When geophysical imaging is combined with in-situ hydraulic and chemical information at multiple depths of the vadose zone, detailed characterization of contaminant transport in heterogeneous systems is obtained. The system was installed at an industrial contaminated site in Belgium. A saline tracer infiltration test was performed over a heterogeneous vadose zone composed of backfilled materials underlined by unsaturated fractured chalk. Surface and cross-hole Electrical Resistivity Tomography (ERT) measurements were carried out over a 5 day period, following tracer injection. Results from time-lapse imaging reveal high resistivity variations at 0-0.5m depth, indicating that most of the tracer remained in the upper backfilled deposits. This is coincident with the results from sampled waters across the vadose zone, as no tracer was detected below 0.5m depth. Lower resistivity differences were observed laterally, indicating tracer migration in different directions via preferential flow paths. Lateral migration was found to be dominant over vertical transport in the absence of rain events. Three months after the injection, a geophysical survey was performed and combined with in situ continuous hydraulic and chemical information at multiple depths of the vadose zone. Results from geophysical imaging and water sample analyses indicate vertical movement of the tracer, which reached 4 m depth. Information obtained from continuous measurements of water content reveal that the tracer was transferred via preferential flow. The activation of such flow mechanism occurred as a response to rainfall episodes, resulting in water percolation and tracer transport towards higher depths. The results of the investigations demonstrate that the VZES is an effective method in identifying pathways and mechanisms of transport within a heterogeneous conductivity fields. The implementation of this methodological concept at industrial contaminated sites contributes to improve the development of site conceptual models for soil and groundwater protection and remediation. [less ▲]

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See detailFactors controlling spatial patterns and time trends of multiple pesticides in groundwater (Hesbaye chalk aquifer, Belgium)
Hakoun, Vivien ULg; Orban, Philippe ULg; Dassargues, Alain ULg et al

Conference (2016, July 25)

Groundwater contamination by pesticides compounds (parent and degradation by-products) is a well identified environmental issue, however factors influencing their spatial patterns and time trends remain ... [more ▼]

Groundwater contamination by pesticides compounds (parent and degradation by-products) is a well identified environmental issue, however factors influencing their spatial patterns and time trends remain unclear. In this context, 18 years long time series (1996-2013) of 3 banned (atrazine, diuron, simazine), 2 metabolites (deethyaltrazine –DEA, and 2,6-dichlorobenzamide –BAM) and one regulated (bentazone) pesticides compounds are explored, taking into account concentrations below detection limits. Using a bivariate and multivariate (PCA and hierarchical clustering) statistical framework, these time series are related to nitrate (NO3-) and the fraction of young water recharged since 50 years, land use, to aquifer settings (i.e. confining conditions, thickness of the unsaturated zone) and to groundwater table fluctuations. Results show that pesticides compounds are always below detection limits in the confined area where old groundwater lies. However these compounds are detected every year in the unconfined zone with maximal concentrations exceeding the current European water drinking standard of 100 ng.L-1 every year since 2007 for atrazine. We find the greatest significant (p-value < 0.05) positive correlations between the trio atrazine-DEA (tau=0.62), atrazine-NO3- (tau=0.48) and DEA-NO3- (tau=0.49). We identify positive correlations between most compounds, atrazine (tau=0.44), bentazone (tau=0.36), simazine (tau=0.71); DEA (tau=0.58) and BAM (tau=0.44), and water table fluctuations with periods spanning several years. We determine two groups (6 and 9 sites each) of site which relate to the discharge and recharge areas. Sites from the recharge area where higher diuron, simazine and BAM concentrations occurs correlate with a dense localized urban area. Atrazine and bentazone relates to sites with thin unsaturated zones and high mixing in the wells. Our analysis reveals critical factors affecting 7 pesticides compounds. It improves our understanding of the interplay between land use, aquifer settings and transient processes (water fluctuations) on controlling pesticides concentrations in groundwater. [less ▲]

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See detailHydrogeochemical mechanisms driving the occurrence of elevated fluoride contents in crystalline aquifers in Benin, Western Africa
Tossou, Yao ULg; Orban, Philippe ULg; Gesels, Julie ULg et al

Conference (2016, July 24)

Elevated concentrations of fluoride in drinking water is the source of severe healthy problems such as dental or skeletal fluorosis. High concentrations of fluoride are often observed in fractured and ... [more ▼]

Elevated concentrations of fluoride in drinking water is the source of severe healthy problems such as dental or skeletal fluorosis. High concentrations of fluoride are often observed in fractured and altered crystalline aquifers around the world. However, the hydrogeochemical mechanisms leading to such elevated fluoride concentrations are usually not fully understood. In particular, it is important to make the link between these elevated concentrations and the geological context in order to make efficient recommendations on appropriate locations of further groundwater abstraction wells. This is the case in Benin, Western Africa, where groundwater from crystalline bed-rock aquifers is the main source for drinking-water supply. In this context, this research aims to identify the hydrogeochemical processes governing groundwater mineralization and the origin of the high fluoride concentrations. The investigations are based on groundwater samples collected in the central part of the country (Department of Collines), characterized by hard Precambrian aquifers. The hydrogeological system consists of a thin altered bedrock layer (shallow aquifer) and a deeper fractured crystalline bedrock (deep aquifer). The most significant groundwater quality problems in the area relate to the high fluoride (more than 7 mg / l) and nitrate (over 400 mg / l) concentrations in groundwater. The collected hydrogeochemical dataset was explored using geochemical approaches and multivariate statistics. The results reveal that the water mineralization derives from hydrolysis of silicate minerals, but it is also influenced by anthropogenic effects, particularly in the shallow reservoir. However, fluoride has a natural origin, essentially related to weathering of silicate minerals, mainly from biotite. Ion exchanges between groundwater and the rock matrix also contributes to increase fluoride concentrations in groundwater. Earlier saturation of water with calcite and the precipitation of this mineral due to bicarbonate excess reduce calcium activity are favorable of the release of fluoride by rocks. Further investigations are going on to make the link between crystalline rock types, associated primary minerals and fluoride concentrations in order to identify the geological contexts which are more prone to such problems. [less ▲]

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See detailSelf-inhibition of synthesis reduces antigen presentation of the alcelaphine herpesvirus 1-encoded latency-associated protein, aLANA
Sorel, Océane; Myster, Françoise; Vanderplasschen, Alain et al

Conference (2016, July 23)

Alcelalphine herpesvirus 1 (AlHV-1) persistently infects its natural host, the wildebeest, without inducing any clinical signs. However, cross-transmission to other ruminant species leads to the ... [more ▼]

Alcelalphine herpesvirus 1 (AlHV-1) persistently infects its natural host, the wildebeest, without inducing any clinical signs. However, cross-transmission to other ruminant species leads to the development of a deadly lymphoproliferative disease named malignant catarrhal fever (MCF). AlHV-1 ORF73 encodes the latency-associated nuclear antigen (LANA)-homolog protein termed aLANA. Similarly to other viral genome maintenance proteins encoded by gammaherpesviruses, aLANA has recently been shown to be essential for viral persistence and induction of MCF. Here we have investigated the self-inhibition of antigen presentation by aLANA and the potential role of such mechanism during the development of MCF. We showed that the GE-rich repeat domain of aLANA was sufficient to inhibit the presentation of an epitope linked to it. Though antigen presentation in absence of GE was dependent upon proteasomal degradation of aLANA, a lack of GE did not affect protein turnover. We further found that similarly to EBNA-1 GAr, aLANA GE downregulated protein self-synthesis. Likewise, such mechanism could be associated with reduced antigen presentation in vitro. In addition, in-frame insertion of GE repeat domain in a heterologous eGFP protein significantly down-regulated protein steady-state levels and self-antigen presentation. Next, we modified the AlHV-1 ORF73 gene sequence to reduce the purine bias in GE, without affecting the peptidic sequence. Such codon-modified aLANA GEm construct displayed increased antigen presentation. Finally, we generated an AlHV-1 recombinant strain expressing a GE-deficient aLANA protein and observed that viral growth was not affected in vitro by the absence of aLANA GE domain and MCF could be induced in rabbits irrespective of the expression of full-length aLANA or GE-deficient aLANA protein. [less ▲]

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See detailLa succession du prince-évêque de Liège dans les biens des ecclésiastiques
Lagasse, Benoît ULg

Conference (2016, July 23)

Explication du régime spécifique au diocèse de Liège de la succession du prince-évêque dans les biens des ecclésiastiques (distinction meubles/immeubles versus distinction biens propres/biens de l'Eglise ... [more ▼]

Explication du régime spécifique au diocèse de Liège de la succession du prince-évêque dans les biens des ecclésiastiques (distinction meubles/immeubles versus distinction biens propres/biens de l'Eglise en droit canonique général). [less ▲]

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See detailLe surréalisme curacien : une construction néerlandaise ?
Andringa, Kim ULg

Conference (2016, July 22)

Depuis les années 1930, une riche littérature « locale » s’est développée sur l’île de Curaçao, qui fait alors partie des Antilles néerlandaises. Presque d’emblée, plusieurs de ses auteurs, poètes comme ... [more ▼]

Depuis les années 1930, une riche littérature « locale » s’est développée sur l’île de Curaçao, qui fait alors partie des Antilles néerlandaises. Presque d’emblée, plusieurs de ses auteurs, poètes comme romanciers, se voient attribuer l’étiquette « surréaliste » par la critique littéraire néerlandaise, et ce malgré l’absence de liens ou de contacts avec des groupes surréalistes d’autres pays. Encore en 2012, quatre poètes caribéens, dont trois curaciens, figurent dans la Nieuwe anthologie van de Nederlandse surrealistische poëzie. Nous tâcherons d’analyser les motifs et les critères sous-jacents à cette catégorisation, depuis quelque temps souvent récusée, afin d’établir s’il y a une réelle sensibilité surréaliste dans cette littérature antillaise néerlandophone, ou s’il s’agit d’une tentative d’apprivoisement de la métropole face à l’émergence de cette nouvelle littérature néerlandaise transatlantique, issue d’une culture différente et qui contribue à une décolonisation des esprits. [less ▲]

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See detailSoil fiction: the experience of a neglected urban thing
Meulemans, Germain ULg

Conference (2016, July 21)

This paper starts with the story of the Soil Fiction project – a residence in which artists, anthropologists and a soil-scientist worked together on developing an exhibition on urban soils – in order to ... [more ▼]

This paper starts with the story of the Soil Fiction project – a residence in which artists, anthropologists and a soil-scientist worked together on developing an exhibition on urban soils – in order to address what speculative realism might bring to anthropological modes of inquiry. For more than 150 years, urban soils were left unnoticed by modern science because of their messiness and boundedness with human activities. Yet, they are a prevalent aspect of urban conditions of life. Through six months of collective work, Soil Fiction explored some of the neglected paths that attach us to urban soils. Departing from attempts to adapt modern-day science to urban soils, it imagined the practices of a minor science developed through a journey along them. These practices were given consistence through the creation of installations and films. Drawing on Stengers’s approach to speculative thinking, I discuss the importance of inventing propositions that work as ‘lures for feelings’. In this, rather than being a figment of the imagination, the craft of speculative imagining can attract experience. Fiction and exhibition making become ways to inquire into the world, to intensify hypothesis, and to forge other relationships with the world. I conclude that imaginative experiments such as Soil Fiction are not only knowledge practices in themselves, but also add more reality to the world. Responding to Ingold’s call for an anthropology that re-unites imagination and reality together, they conjure up research modes that do not discriminate between soils and our knowledge of them. [less ▲]

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See detailThe influence of COMT on the neural substrates of short-term memory in normal aging
Collette, Fabienne ULg; Manard, Marine ULg; Salmon, Eric ULg

Conference (2016, July 21)

Working memory dopaminergic modulation is generally expressed in healthy aging by an advantage for carriers of the Met allele at behavioral and brain activity levels. However, most tasks used did not ... [more ▼]

Working memory dopaminergic modulation is generally expressed in healthy aging by an advantage for carriers of the Met allele at behavioral and brain activity levels. However, most tasks used did not allow to easily disentangle the contribution of maintenance and manipulation processes. We explored the effect of COMT genotype on the maintenance process using a Sternberg memory task varying the amount of information presented, in young and older homozygous carriers for the Val and Met alleles of the COMT gene. Although no clear behavioral difference was observed between groups, patterns of cerebral activity indicate difficulties for Met older individuals to maintain stable representations. These results will be discussed in terms of dopaminergic contribution to stability/flexibility of cognitive processes during aging. [less ▲]

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See detailIntegrating biological indicators in a monitoring network to improve soil quality diagnosis – a case study in Southern Belgium
Krüger, Inken ULg; Chartin, Caroline; van Wesemael, Bas et al

Conference (2016, July 21)

Detailed reference viewed: 28 (4 ULg)
See detailSelf-assembly of capillary multipoles
Poty, Martin ULg; Lagubeau, Guillaume; Lumay, Geoffroy ULg et al

Conference (2016, July 21)

Self-assembly of floating particles driven by capillary forces at some liquid-air interface leads to the formation of two-dimensionnal structures. Using a 3d printer, millimeter scale objets are produced ... [more ▼]

Self-assembly of floating particles driven by capillary forces at some liquid-air interface leads to the formation of two-dimensionnal structures. Using a 3d printer, millimeter scale objets are produced. Their 3d shape is chosen in order to create capillary multipoles. The capillary interactions between these components can be either attractive or repulsive depending on the interface local deformations along the liquid-air interface. In order to understand how the shape of an object deforms the interface, we developed an original profilometry method. The measurements show that specific structures can be programmed by selecting the 3d branched shapes. [less ▲]

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See detailenseigner massivement la littérature jeunesse : la Formation en Ligne Ouverte à tous de l'Université de Liège
Centi, Valérie; D'Anna, Vincianne; Delbrassine, Daniel ULg et al

Conference (2016, July 20)

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See detailAlumina and zircon refractory ceramic molds fabrication by additive methods for metal alloys casting
Bister, Geoffroy; Hautcoeur, Dominique; Deschuyteneer, Dorian et al

Conference (2016, July 19)

Traditional processes for the foundry molds fabrication need numerous and rather time consuming steps. These processes are not really adapted to small series or prototypes. The research project exposed in ... [more ▼]

Traditional processes for the foundry molds fabrication need numerous and rather time consuming steps. These processes are not really adapted to small series or prototypes. The research project exposed in this contribution proposes an alternative method combining the advantages of molding (free formulation of metal alloys, economy on material and on time of machining) with those of the additive processes (short steps between 3D-model and final product, very complex geometries available). For short series the selective laser melting process (SLM) allows the building of molds in a very short time compared to the traditional investment casting method. This technique also permits the unique advantage to control the design of the shell thickness and structure in order to have a better control of the thermal fluxes during metal cooling. This would potentially ensure a better control of the casting defaults. In this presentation, molds built with alumina and zircon as raw materials will be presented. Two metallic alloys have been tested in order to validate alumina and zircon as mold materials; the first, AlCu4MgSi chosen as low melting point alloy reference and the second, stainless steel 316L, as high melting point alloy reference [less ▲]

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See detailLa logique de l'espace dans les stemmas de Lucien Tesnière
Mazziotta, Nicolas ULg

Conference (2016, July 19)

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See detailStudy of Sn and Fe based electrode materials for Alkali-ion batteries by in situ Mössbauer spectroscopy
Mahmoud, Abdelfattah ULg; Sougrati, Moulay Tahar; Hermann, Raphaël ULg et al

Conference (2016, July 19)

Li-ion batteries are widely used for electrochemical energy storage, because of their high energy density and efficiency. The most significant challenges in the development of advanced Li-ion batteries ... [more ▼]

Li-ion batteries are widely used for electrochemical energy storage, because of their high energy density and efficiency. The most significant challenges in the development of advanced Li-ion batteries concern the electrode materials. Indeed, the electrodes properties critically determine the capacity, performance, and durability of alkali-ion batteries. In the past five decades, Mössbauer spectroscopy has been an important analytical technique for investigating the structural, magnetic and electronic properties of energy materials. Mössbauer spectroscopy allows simultaneous investigation of bulk and surface characteristics. It is a non-destructive technique that can follow the behavior of electrode materials during the reaction process in situ and operando [1]. Its high resolution enables the observation of all Mössbauer active phases and the measure of their relative quantities . Iron and tin containing materials are of considerable interest as electrode material for Li-ion batteries [2, 3]. In this presentation, we report in situ and operando measurements of new electrode materials based on Fe and Sn during electrochemical cycling by combining Mössbauer spectroscopy with complementary techniques (X-ray diffraction, magnetic measurements, impedance spectroscopy, etc.) to study and investigate the electrochemical behavior of the electrode materials. [less ▲]

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See detailLes représentations du français dans le sous-système éducatif anglophone du Cameroun: le regard des élèves de la filière Arts
Mouto Betoko, Christiane ULg

Conference (2016, July 19)

Avec l’entrée du Cameroun au Commonwealth of Nations d’une part, et, le rayonnement de la langue anglaise d’autre part, les Francophones, majoritaires au Cameroun, se ruent à l’apprentissage de l’anglais ... [more ▼]

Avec l’entrée du Cameroun au Commonwealth of Nations d’une part, et, le rayonnement de la langue anglaise d’autre part, les Francophones, majoritaires au Cameroun, se ruent à l’apprentissage de l’anglais. Cependant, le mouvement inverse n’est pas visible dans la communauté anglophone minoritaire. Toutefois, un nombre non négligeable d’élèves anglophones s’engagent à poursuivre l’apprentissage du français jusqu’à la fin de leur cursus secondaire. Pour comprendre les raisons de cet engagement, nous allons répondre aux questions telles que : quelle est l’image que ces élèves se font de la langue française ? À quels projets l’associent-ils? Quel est impact des médias dans leur rapport avec le français ? Quelle est la perception de la plus-value de l’apprentissage de cette langue ? Quel est l’intérêt de la prise en compte des représentations de ces élèves dans l’enseignement du French au Cameroun ? [less ▲]

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See detailVariations lexicales dans la mise en prose de Barlaam et Josaphat
Lambert, Adélaïde ULg

Conference (2016, July 19)

La confrontation de la version anonyme en vers de Barlaam et Josaphat avec sa mise en prose, produite au XIIIe siècle, offre un point de vue privilégié sur la langue littéraire en prose, à l’aube de son ... [more ▼]

La confrontation de la version anonyme en vers de Barlaam et Josaphat avec sa mise en prose, produite au XIIIe siècle, offre un point de vue privilégié sur la langue littéraire en prose, à l’aube de son épanouissement. Parallèlement au retranchement d’épisodes entiers, le remanieur s’applique à conserver une étroite proximité avec la lettre de son modèle francien, et semble tendre vers un compromis entre fidélité au texte-source et intelligibilité du texte-cible. Ainsi, à côté de l’importation massive du matériau lexical et des structures syntaxiques du texte versifié, toutes ses interventions sont observables. Notre communication s’est focalisée sur un échantillon de neuf substitutions lexicales dont nous avons mesuré la fréquence et dont il s’agissait d’identifier les implications. En tant que témoins de l’actualisation linguistique du texte-source, ces variations (diachroniques et/ou diaphasiques) permettent d’améliorer la connaissance du vocabulaire de la mise en prose de Barlaam et Josaphat et de cerner avec plus de précision la sensibilité du remanieur à l’égard du lexique de sa source. [less ▲]

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See detailProbing single molecules with the AFM: Force, motion, dynamics, and function
Duwez, Anne-Sophie ULg

Conference (2016, July 18)

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See detailOn the organization of episodic future thoughts in event clusters
D'Argembeau, Arnaud ULg

Conference (2016, July 18)

Memory can be flexibly used to image events that might happen in one’s personal future, a capacity that has been referred to as episodic future thinking. In this talk, I will present data showing that ... [more ▼]

Memory can be flexibly used to image events that might happen in one’s personal future, a capacity that has been referred to as episodic future thinking. In this talk, I will present data showing that many episodic future thoughts are not represented in isolation, but instead are part of higher-order event clusters that organize imagined events in coherent themes and causal sequences. Personal goals seem to play an important role in this organization and neuroimaging evidence shows that event clusters recruit brain regions supporting conceptual and integrative processing. These findings suggest that episodic future thinking involves the integration of specific event representations with autobiographical knowledge, which contextualizes imagined events with respect to personal goals and general expectations about one’s life. [less ▲]

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See detailLe français pour l’unité et l’intégration nationales au cameroun
Mouto Betoko, Christiane ULg

Conference (2016, July 16)

La politique du bilinguisme officiel s’est imposée au Cameroun pour des raisons d’unité nationale suite à une double colonisation franco-britannique. En milieu scolaire, le bilinguisme renvoie ... [more ▼]

La politique du bilinguisme officiel s’est imposée au Cameroun pour des raisons d’unité nationale suite à une double colonisation franco-britannique. En milieu scolaire, le bilinguisme renvoie généralement à l’enseignement du français en tant que deuxième langue officielle aux Anglophones et, à l’enseignement de l’anglais en tant que deuxième langue officielle aux Francophones. Néanmoins, les élèves anglophones éprouvent d’énormes difficultés d’intégration à la fin des études secondaires. Quels sont donc les objectifs de l’enseignement du français aux élèves anglophones ? Quelle est l’approche méthodologique mise en œuvre pour atteindre ces objectifs ? Et enfin, comment allier objectifs scolaires du bilinguisme et méthodologie du FLE pour préparer les élèves anglophones à la vie après le secondaire ? [less ▲]

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See detailRoland Barthes et les écritures de la chronique
Stienon, Valérie ULg

Conference (2016, July 14)

La plupart des textes de Roland Barthes sont le produit d’une commande – qu’elle soit amicale, événementielle, éditoriale. L’inscription dans un genre ou l’investissement d’un mode d’écriture s’appuie ... [more ▼]

La plupart des textes de Roland Barthes sont le produit d’une commande – qu’elle soit amicale, événementielle, éditoriale. L’inscription dans un genre ou l’investissement d’un mode d’écriture s’appuie donc sur une situation de communication dont les paramètres sont souvent bien déterminés et qui est elle-même guidée par une demande préalable, de sorte que dispositif générique et horizon d’attente s’entre-déterminent de manière cruciale. Plus encore, les commandes passées à Barthes, avant d’être des livres, prennent généralement la forme d’articles dans des périodiques. Il y a de la sorte une dimension intrinsèquement circonstancielle à l’écriture barthésienne, dimension propice à la relation d’actualité. Dès lors, dans quelle mesure la chronique peut-elle offrir une clé de lecture du cheminement d’écriture de Barthes et du parcours de sa pensée ? [less ▲]

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See detailOn the use of ROC curves in DIF simulation studies
Magis, David ULg; Tuerlinckx, Francis

Conference (2016, July 14)

Simulation studies are often used to compare methods to detect differential item functioning (DIF). However, comparing the performance of such methods can become complicated when the identification of DIF ... [more ▼]

Simulation studies are often used to compare methods to detect differential item functioning (DIF). However, comparing the performance of such methods can become complicated when the identification of DIF items relies on statistics based on pre-defined significance level or on pre-established cutoff values. DIF methods based on conceptually different approaches may therefore become incomparable in terms of summary DIF statistics such as false alarm rate or hit rate. The purpose of this talk is to overcome this analytic issue by introducing receiver operating characteristic (ROC) curves in this context. ROC curves allow for global comparison of methods’ performances by computing pairs of (false alarm, hit) rates and representing them on a common scatter plot. Several summary ROC statistics can be considered for further analysis. The application of the ROC curve methodology, together with its limitation and possible extensions, is illustrated by a simple simulation study that compares three score-based DIF methods (Mantel-Haenszel, standardization and Delta plot). [less ▲]

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See detailCharacterization of FRD3, a zinc and iron homeostasis actor in Arabidopsis relatives
Scheepers, Maxime ULg; Charlier, Jean Benoit; Spielmann, Julien ULg et al

Conference (2016, July 14)

Zinc and iron are two essential micronutrients for plants. The homeostasis networks of the two metals are intertwined. Arabidopsis halleri is a zinc- and cadmium-tolerant and zinc-hyperaccumulating ... [more ▼]

Zinc and iron are two essential micronutrients for plants. The homeostasis networks of the two metals are intertwined. Arabidopsis halleri is a zinc- and cadmium-tolerant and zinc-hyperaccumulating species, which also present adaptation of its iron homeostasis(1,4). Transcriptomic studies identified genes which are constitu-tively over-expressed in Arabidopsis halleri compared to Arabidopsis thaliana and which may have a role in metal tolerance or accumulation(2-4). Among them, a candidate gene encodes the FRD3 (FERRIC REDUCTASE DEFECTIVE 3) protein, a member of the MATE family of membrane transporters. FRD3 is a citrate transporter involved in iron homeostasis(5-7) and plays a role in zinc tolerance in A. thaliana(8). The FRD3 gene displays a complex regulation. In A. thaliana, alternative transcript initiation for FRD3 determines two transcripts, which dif-fer in their 5'UTRs and have differential translation efficiency. The two transcripts are selectively regulated under stress conditions: iron and zinc depletion, zinc excess or cadmium presence(9). In A. halleri, a single highly ex-pressed FRD3 transcript with high translation efficiency is present(9). We are further examining the FRD3 function in zinc and iron homeostasis in A. thaliana and A. halleri. We will present data (i) on the high expression of FRD3 in A. halleri, (ii) on the functional characterization of the two alternative FRD3 transcripts and their role in metal homeostasis in A. thaliana in comparison with the A. halleri FRD3 transcript and (iii) on the zinc phenotypes of the frd3 A. thaliana mutant. [less ▲]

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See detailOpen source programming: a new hope for psychometric research
Magis, David ULg

Conference (2016, July 14)

Current psychometric research is most often supported by computer software. New research perspectives often imply intensive simulation studies to validate the tested theories or hypotheses, and therefore ... [more ▼]

Current psychometric research is most often supported by computer software. New research perspectives often imply intensive simulation studies to validate the tested theories or hypotheses, and therefore require accurate, fast and stable implementation. To this regards, open source programming (such as in the R language) is a promising approach allowing for flexible implementation, data generation, replication of studies, and worldwide dissemination. The purpose of this talk is to illustrate how psychometrics and open source programming (with special emphasis on the R language) can interact and contribute to each other, by means of some selected examples. Several topics will be illustrated, among others: why open source programming is (to my opinion) as important as psychometric research; why we need for stable and complete implementation of psychometric and statistical routines for research purposes (for e.g., CAT); how accurate implementation of IRT routines can lead to unexpected theoretical results; why (and how) open source software can be valued as research output. Most examples will arise from the CAT framework and the R package catR for simulating CAT patterns. [less ▲]

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See detailExamine the effects of two adjustments to the lz statistic
Riley, Barth; Magis, David ULg

Conference (2016, July 14)

Conformity to a known distribution and sensitivity to response aberrance are desirable properties of person-fit statistics. This simulation study examined the joint and independent effects of two ... [more ▼]

Conformity to a known distribution and sensitivity to response aberrance are desirable properties of person-fit statistics. This simulation study examined the joint and independent effects of two adjustments to the standardized log-likelihood statistic (lz): (1) correction of the negatively skewed distribution of lz (Snijders, 2001), and (2) improving the sensitivity of the statistic by employing more accurate estimates of item response probability using symmetric functions (Dimitrov and Smith, 2006). Data were simulated using three test lengths (10, 20, 30 items). Data containing misfitting response patterns were simulated using three aberrant response patterns (cheating, guessing, and inattentiveness), and three levels of aberrance (i.e., proportion of item responses affected by misfit; 10%, 30% and 50%). Data containing no simulated misfitting response patterns were also generated for each test length. Non-misfitting responses were generated using the dichotomous Rasch measurement model. For each combination of independent variables, a dataset was generated consisting of 5,000 simulees. Four fit statistics were compared: lz, lz* (Snijders adjustment), lzSYM (Dimitrov and Smith adjustment), and lzSYM* (both adjustments). Mean Type I error rates were ≤ 0.1 across all conditions. The lz* statistic produced the best control of Type I error, which was often below the nominal Type I error rate, whereas the empirical Type I error rate for the unadjusted lz statistic most closely approximated the nominal rate. In contrast, lzSYM and lzSYM* yielded empirical Type I error rates larger than the nominal rate, with the discrepancy being particularly pronounced as the length of the test decreased. As might be expected, power to detect misfitting response patterns increased with test length and with the percentage of misfitting response patterns in the sample. Both lzSYM and lzSYM* evidenced improved power in detecting misfitting response patterns compared to lz and lz*, particularly for guessing response patterns and/or on shorter (i.e., 10 item) tests. [less ▲]

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See detailA Crypt of Swipes. Charles Burns Haunted by Tintin
Crucifix, Benoît ULg

Conference (2016, July 13)

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See detailShaping (im)mobility in border camps: a case study of the transformation of Calais camps and its actors
Da Silva, Amanda Carolina ULg

Conference (2016, July 13)

This paper explores the transition of informal temporary camps on the French border to a sustainable state, and discusses how local policy decisions and non-state actors worked together for the ... [more ▼]

This paper explores the transition of informal temporary camps on the French border to a sustainable state, and discusses how local policy decisions and non-state actors worked together for the implementation of a semi-permanent exclusion system based on the refugee crisis. I observe this issue as a result of a securitization process. The securitization apparatus (speech acts and policies), produced the immobility of a group. In the other hand actors will emerge to produce mobility. When a situation is defined as a crisis, atypical actions can be employed to protect the «political community». I started from the assumption that dialectic relation between securitization and camps actors had a high impact on the projects of refugees, and so long in their mobility. This is a question of integration policies at the local level. I aim to highlight the local level relevance, where the integration is primarily implemented, and therefore local and regional context should matter as much as the national model for integration (Martiniello, 2013). In Calais, due to the lack of immigrants policies, civilians associations started to react and build informal camps, but due to recent "crisis" the Stat concentrated all refugees in a single camp, 6 kilometers from the city center, called bidonville. [less ▲]

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See detailOperational costs and externalities in optimal intermodal network design
Mostert, Martine ULg; Limbourg, Sabine ULg; Caris, An

Conference (2016, July 13)

Transportation of goods is essential for the economy but also leads to harmful impacts related to human health aspects. Intermodal transport is promoted by Europe to reduce these negative externalities ... [more ▼]

Transportation of goods is essential for the economy but also leads to harmful impacts related to human health aspects. Intermodal transport is promoted by Europe to reduce these negative externalities. The objective of this paper is to analyze at the strategic level how the flow repartition varies between three modes (road, intermodal rail and intermodal inland waterway) according to different implemented policies. A mathematical allocation model is developed and tested on the Belgian case study, in order to determine the observed changes between the single minimization of (operational or health-related external) costs and the introduction of additional road taxes. [less ▲]

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See detailMean-Field-Homogenization-based stochastic multiscale methods for composite materials
Wu, Ling ULg; Lucas, Vincent ULg; Adam, Laurent et al

Conference (2016, July 12)

When considering a homogenization-based multiscale approach, at each integration-point of the macro-structure, the material properties are obtained from the resolution of a micro-scale boundary value ... [more ▼]

When considering a homogenization-based multiscale approach, at each integration-point of the macro-structure, the material properties are obtained from the resolution of a micro-scale boundary value problem. At the micro-level, the macro-point is viewed as the center of a Representative Volume Element (RVE). However, to be representative, the micro-volume-element should have a size much bigger than the micro-structure size. For composite materials which suffer from a large property and geometrical dispersion, either this requires RVE of sizes which cannot usually be obtained numerically, or simply the structural properties exhibit a scatter at the macro-scale. In both cases, the representativity of the micro-scale volume element is lost and Statistical Volume Elements (SVE) [1] should be considered in order to account for the micro-structural uncertainties, which should in turn be propagated to the macro-scale in order to predict the structural properties in a probabilistic way. In this work we propose a non-deterministic multi-scale approach for composite materials following the methodology set in [2]. Uncertainties on the meso-scale properties and their (spatial) correlations are first evaluated through the homogenization of SVEs. This homogenization combines both mean-field method in order to gain efficiency and computational homogenization to evaluate the spatial correlation. A generator of the meso-scale material tensor is then implemented using the spectral method [3]. As a result, a meso-scale random field can be generated, paving the way to the use of stochastic finite elements to study the probabilistic behavior of macro-scale structures. [1] M. Ostoja-Starzewski, X.Wang, Stochastic finite elements as a bridge between random material microstructure and global response, Computer Methods in Applied Mechanics and Engineering, 168, 35–49, 1999. [2] V. Lucas, J.-C. Golinval, S. Paquay, V.-D. Nguyen, L. Noels, L. Wu, A stochastic computational multiscale approach; Application to MEMS resonators. Computer Methods in Applied Mechanics and Engineering, 294, 141–167, 2015. [3] Shinozuka, M., Deodatis, G. Simulation of stochastic processes by spectral representation. Appl. Mech. Rev., 1991: 44(4): 191-204, 1991. [less ▲]

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See detailThe Methods of Managgement: An Answer to the crisis
Robert, Jocelyne ULg

Conference (2016, July 12)

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See detailFailure multiscale simulations of composite laminates based on a non-local mean-field damage-enhanced homogenization
Wu, Ling ULg; Adam, Laurent; Doghri, Issam et al

Conference (2016, July 12)

A multiscale method is developed to study the failure of carbon fiber reinforced composites. In order to capture the intra-laminar failure, a non-local mean-field homogenization (MFH) method accounting ... [more ▼]

A multiscale method is developed to study the failure of carbon fiber reinforced composites. In order to capture the intra-laminar failure, a non-local mean-field homogenization (MFH) method accounting for the damage evolution of the matrix phase of the composite material [1] is considered. In that formulation, an incremental-secant MFH approach is used to account for the elastic unloading of the fibers during the strain softening of the matrix. In order to avoid the strain/damage localization caused by the matrix material softening, an implicit non-local method [2] was reformulated to account for the composite material anisotropy. As a result, accurate predictions of the composite softening behavior and of the different phases response is possible, even for volume ratios of inclusions around 60%. In particular it is shown that the damage propagation direction in each ply follows the fiber orientation in agreement with experimental data. The delamination process is modeled by recourse to a hybrid discontinuous Galerkin (DG)/ extrinsic cohesive law approach. As for the extrinsic cohesive law (ECL), which represents the fracturing response only, and for which cohesive elements are inserted at failure onset, the method does not suffer from a mesh-dependent effect. However, because of the underlying discontinuous Galerkin method, interface elements are present since the very beginning of the simulation avoiding the need to propagate topological changes in the mesh with the propagation of the delamination. Moreover, the pre-failure response is accurately captured by the material law though the DG implementation, by contrast to usual intrinsic cohesive laws. As a demonstration of the efficiency and accuracy of the method, a composite laminate with a quasi-isotropic sequence ([90/45/-45/90/0]S) and an open-hole geometry is studied using the multiscale method [3] and the results are compared to experimental data. The numerical model is found to predict the damage bands along the fiber directions as observed in the experimental samples inspected by X-ray computed tomography (XCT). Moreover, the predicted delamination pattern is found to match the experimental observations. REFERENCES [1] L. Wu, L. Noels, L. Adam, I. Doghri, An implicit-gradient-enhanced incremental-secant mean- field homogenization scheme for elasto-plastic composites with damage, International Journal of Solids and Structures, 50, 3843-3860, 2013. [2] R. Peerlings, R. de Borst, W. Brekelmans, S. Ayyapureddi, Gradient-enhanced damage for quasi-brittle materials. International Journal for Numerical Methods in Engineering, 39, 3391-3403, 1996. [3] L. Wu, F. Sket, J.M. Molina-Aldareguia, A. Makradi, L. Adam, I. Doghri, L. Noels, A study of composite laminates failure using an anisotropic gradient-enhanced damage mean-field homogenization model, Composite Structures, 126, 246–264, 2015. [less ▲]

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See detailAccounting conservatism, analysts’ performance and stock market liquidity
Boussaid, Nabila ULg; Hamza, Taher; Sougné, Danielle ULg

Conference (2016, July 11)

This paper investigates whether conditional accounting conservatism has informational benefits to financial market participants. Using a large sample of French firms over the period 2001-2014, we report ... [more ▼]

This paper investigates whether conditional accounting conservatism has informational benefits to financial market participants. Using a large sample of French firms over the period 2001-2014, we report that accounting conservatism improves the firm information environment by providing verifiable information. We specifically document that increases in accounting conservatism are associated with more accurate analyst earnings forecasts, less dispersed forecasts and less volatility in forecast revisions. We also provide evidence that increases in firm accounting conservatism lead to subsequent increases in stock market liquidity, tested on the price impact dimension. Overall, our findings are in line with conservatism being useful to financial markets participants such as financial analysts and investors. [less ▲]

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See detailHieroglyphic encoding: The Thot Sign-List (TSL) data model and the hieroglyphic signs in Unicode
Polis, Stéphane ULg; Rosmorduc, Serge

Conference (2016, July 11)

In this paper, we review issues related to the existing hieroglyphic sign-lists, focusing especially on the problematic aspects of the 'Manuel de Codage' (1988) and of the so-called 'Hieroglyphica' (2000 ... [more ▼]

In this paper, we review issues related to the existing hieroglyphic sign-lists, focusing especially on the problematic aspects of the 'Manuel de Codage' (1988) and of the so-called 'Hieroglyphica' (2000) for font-designers and users alike. We propose and discuss a data model for the Thot Sign-List (TSL, in prep.). This data model shall lead to the implementation of a structured and systematically referenced hieroglyphic repertoire, which should ultimately allow a sound extension of the Egyptian Hieroglyphs in Unicode. [less ▲]

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See detailGestion des flux patients et surpopulation des urgences : Heurs et malheurs de la fonction de « Bed Manager ».
GILLET, Aline ULg; Minder, Anaïs ULg; Nyssen, Anne-Sophie ULg et al

Conference (2016, July 11)

For many years, emergency departments (ED) overcrowding has become a major issue in Public Health. Many studies have demonstrated the efficiency of flow management coordination on this recurrent problem ... [more ▼]

For many years, emergency departments (ED) overcrowding has become a major issue in Public Health. Many studies have demonstrated the efficiency of flow management coordination on this recurrent problem, by offering an interface between the ED, the hospital and out-of-hospital structures and by coordinating patients’ movements towards hospital care units. This was the basis for the implementation of "bed management" coordination program in the ED of the University Hospital of Liège in January 2014. The present study evaluates the adequacy of the Bed Manager (BM) activity with actual ED and hospital workload. Our results describe the rate of intra-hospital patients’ transfers according to the adequacy of the destination unit and time delays for these transfers. Head nurses from specific care units were interrogated about their perceptions of BM activity. We are now convinced by the importance of a participative approach in the development of ED bed management and working procedures, as well as the usefulness of further studies to explore this complex activity. [less ▲]

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